KR102627098B1 - Automatic nondestructive testing system for 3D printers using magnetic particle detection method - Google Patents

Abstract

The present invention relates to an automatic non-destructive inspection system for 3D printers using magnetic particle detection, and more specifically, to a head part for 3D printing an object, a workbench for 3D printing an object, and a printing position of the object by moving the workbench. It includes a work position control unit for adjusting the work position, and a magnetic particle inspection unit for inspecting defects in objects printed on the workbench using magnetic particles.
According to the present invention as described above, a series of processes such as quality inspection and repair work can be performed by one worker, and since the non-destructive inspector is not directly inserted into the work space, work safety is high and the inspection is carried out automatically, so the inspection is easy. Automatic non-destructive testing for 3D printing work inspection that can increase reliability is possible.

Description

Automatic nondestructive testing system for 3D printers using magnetic particle detection method}

The present invention relates to an automatic non-destructive inspection system for 3D printers using magnetic particle detection. More specifically, a series of processes such as production by 3D printing, quality inspection by a non-destructive inspection device, and repair work are performed by one worker. It is about an automatic non-destructive inspection system for 3D printers using magnetic particle detection that can increase the reliability of inspection because the non-destructive inspector is not directly put into the work space, so work safety is high and the inspection is carried out automatically.

In general, a 3D printing device is a device that produces a three-dimensional sculpture. It differentiates data about the shape of a three-dimensional sculpture to generate data about a two-dimensional plane, and layers materials according to the generated data to create a three-dimensional sculpture. produces.

3D printing techniques for manufacturing three-dimensional objects made of metal include PBF (Powder Bed Fusion) and DED (Directed Energy Deposition), which use heat sources such as laser beams, electron beams, and plasma. One of them is wire-shaped filler metal and base material. There is a method of manufacturing a sculpture by melting the filler metal and base layer materials with the electric arc heat generated in the gap between them, attaching them one by one, and stacking them. This type is made using a welding technique called GMAW, which was previously called WADED (Wire Arc Directed Energy Deposition) 3D printing.

In the 3D technique using GMAW, the substrate material or full layer is melted by arc heat during the lamination process to form a concave molten pool. The center of the molten pool has a temperature of over 6000°C due to the concentrated arc heat, and the molten pool has a temperature of over 6000°C. The outermost layer is the boundary between the solid and liquid phases and has a temperature of approximately 1500°C. This phenomenon causes a very extreme temperature gradient in the melt and adjacent areas. The melt in the molten pool, which has a temperature of over 6000℃, forms wave-shaped ripples at regular intervals on the printing surface due to the rapid natural flow and movement of the molten pool according to the printing speed, and these are usually expressed as beads. It is well known in the welding industry that the formation of a weld bead due to an extreme temperature gradient can leave welding defects such as pores inside the welding bead and that cracks can occur on the surface, and to inspect this, as specified in the procedure, before, during, and after welding. After welding, conduct appropriate non-destructive testing to confirm the soundness of the product.

If a defect is found when a non-destructive test is performed on a 3D printed sculpture, the defect must be removed by cutting the product to the part where the defect exists. This will take a lot of time and money, and excessive heat sources may be applied for repair, resulting in damage. In some cases, the quality of the product may deteriorate or deform, requiring discarding during repair.

[Prior art literature]

[Patent Document]

1. Domestic Patent Registration No. 10-2226094-0000 (2021.03.04.)

2. Domestic Patent Registration No. 10-2194694-0000 (2020.12.17.)

3. Domestic Patent Registration No. 10-1872935-0000 (2018.06.25.)

The present invention was proposed to solve the problems of the prior art described above, and its purpose is to ensure that a series of processes such as production by 3D printing, quality inspection by non-destructive testing equipment, and repair work can be performed by one worker. , the aim is to provide an automatic non-destructive inspection device and method for 3D printing work inspection using magnetic particle inspection, which can increase the reliability of inspection because non-destructive inspectors are not directly inserted into the work space, so work safety is high and inspection is carried out automatically.

The problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved that are not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the following description.

The present invention for achieving the above object is a head unit for 3D printing an object, a work table for 3D printing an object, a work position control unit for moving the work table to adjust the printing position of the object, and magnetic particles. It includes a magnetic particle inspection unit to check whether the object printed on the workbench is defective.

Preferably, the magnetic particle inspection unit includes a magnetic flux supply unit that provides magnetic flux to the object, a magnetic particle supply unit that sprays magnetic particles to the object to which the magnetic flux is supplied, and a magnetic particle detection unit that detects the distribution pattern of the magnetic particles arranged by the supplied magnetic flux. Magnetic particle detection means including; Defect analysis means for determining discontinuities by analyzing signals received from the magnetic particle detection sensor; and a defect repair means that performs repair of the discontinuity according to the results analyzed by the defect analysis means.

Preferably, the magnetic flux supply unit includes a pair of magnetic flux supply pads or a magnetic flux supply coil.

Preferably, the magnetic flux supply unit is capable of moving in the horizontal and vertical directions through the horizontal moving part and the vertical moving part, respectively, so that magnetic flux can be supplied from at least two directions to the object.

Preferably, in one embodiment of the present invention, the head part,

It includes a head base, a welding torch for 3D printing, a wire feeder for supplying material to the welding torch, a weaving part for moving the welding torch, and a head moving part for moving the head base.

Preferably, the head moving unit includes a head rotating base rotatably provided inside the head base, a head lifting base provided to move up and down in the head lifting base, and a first head for moving the head base in the forward and horizontal direction. It includes a head horizontal moving part, a second head horizontal moving part for moving the head base in the left and right horizontal directions, a head lifting driving part for lifting the head lifting base, and a head rotating driving part for rotating the head rotating base. .

Preferably, the weaving unit has a predetermined arc, a weaving tilting guide provided at a lower end of the head rotating base, a welding torch, and a weaving rotating block movable along the weaving tilting guide, and It includes a weaving tilting drive unit for moving the position rotation block along the weaving tilting guide.

And as another embodiment of the present invention, the head part,

For 3D printing, a 3D printing device equipped with a welding torch, a wire feeder for supplying material to the welding torch, and a multi-axis router, a multi-joint robot, or other known moving means to move the welding torch. Includes.

Preferably, the work position adjusting unit includes a work rotating unit for rotating the work table based on a first extension line passing through the head portion and the work table, and a work table positioning unit based on a second extension line perpendicular to the first extension line. It includes a work tilting unit for tilting.

Preferably, the work rotation unit has a work rotation motor and rotates the work table.

In addition, the work tilting unit includes a work tilting frame provided with the work rotation motor, a work tilting rotation unit rotatably connecting both ends of the work tilting frame, and a work tilting motor for rotating the work tilting frame.

And the present invention further includes a cooling temperature sensor for controlling the cooling temperature of the object.

In the present invention, an air spray device can be used to cool an object, and in this case, it has the characteristic of controlling the cooling rate by considering the material and cooling characteristics of the object. For objects for which special material properties are not considered, cooled nitrogen gas (vaporized liquefied nitrogen) can be used.

Preferably, the present invention further includes a surface pretreatment means including a bead removal unit for removing beads from the surface of the object, and a chip removal unit for removing chips generated during the bead removal process.

Preferably, the present invention further includes a discontinuity coordinate display means for displaying the discontinuity as coordinates on the CAD.

Preferably, the present invention further includes a demagnetizing means for demagnetizing the object after completion of the inspection.

Preferably, the present invention further includes a marking means for marking the position of the discontinuity at the corresponding position of the object.

Preferably, the welding torch is provided to be detachable by a fastening part, and the fastening part includes a fastening body having a plurality of branches at one end, having elasticity in the radial direction, and a fastening groove formed along the outer peripheral surface, and the fastening groove. One end of the formed fastening body is expanded outward to include a fastening tool eastern part for fastening the welding torch.

Preferably, the head part, after the work is completed by the welding torch, separates the process tool part on which each means for the subsequent process is mounted, and the welding torch fastened by the fastening part by gripping or separating the process tool. It further includes a process tool supply unit for gripping one of the process tools and fastening it to the fastening unit.

According to the automatic non-destructive inspection system for 3D printers using the magnetic particle inspection method according to the present invention, a series of processes such as quality inspection and maintenance work can be performed by one worker, and since the non-destructive inspector is not directly inserted into the work space, the work is completed. It is a very useful and effective invention that enables automatic non-destructive testing for 3D printing work inspection that can increase the reliability of inspection because it is highly safe and the inspection is carried out automatically.

1 is a diagram showing an automatic non-destructive inspection system for a 3D printer using a magnetic particle inspection method according to the present invention;
Figure 2 is a diagram showing a head portion and a work position adjusting portion according to an embodiment of the present invention;
3A and 3B are diagrams showing another embodiment of the head portion according to the present invention, respectively;
Figure 4 is a diagram showing a fastening part according to the present invention,
Figure 5 is a diagram showing one embodiment of a magnetic particle inspection unit according to the present invention.
Figure 6 is a detailed configuration diagram for an embodiment of the controller according to the present invention.
Figure 7 shows the configuration of a system for non-destructive inspection using a scan camera as another embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. The detailed description set forth below in conjunction with the accompanying drawings is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the invention. However, those skilled in the art will recognize that the present invention may be practiced without these specific details.

In some cases, in order to avoid ambiguity of the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form focusing on the core functions of each structure and device.

Throughout the specification, when a part is said to “comprise or include” a certain element, this means that it does not exclude other elements but may further include other elements, unless specifically stated to the contrary. do. Additionally, the term “… unit” used in the specification refers to a unit that processes at least one function or operation. In addition, the terms "a or an", "one", "the", and similar related terms are used in the context of describing the invention (particularly in the context of the claims below) as used herein. It may be used in both singular and plural terms, unless indicated otherwise or clearly contradicted by context.

In describing embodiments of the present invention, if a detailed description of a known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are terms defined in consideration of functions in the embodiments of the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

Figure 1 is a diagram showing an automatic non-destructive inspection system for a 3D printer using a magnetic particle inspection method according to the present invention, Figure 2 is a diagram showing a head portion and a work position adjusting portion according to an embodiment of the present invention, Figure 3a, 3b is a diagram showing different embodiments of the head part according to the present invention, Figure 4 is a diagram showing a fastening part according to the present invention, and Figure 5 is a diagram showing a magnetic particle inspection unit according to an embodiment of the present invention.

As shown in the drawing, the automatic non-destructive inspection system for 3D printers using magnetic particle inspection includes a head unit (10), a work table (20), a work position control unit (60), a magnetic particle inspection unit (100), and a controller (200). Includes.

In the present invention, the head portion 10 is provided for 3D printing the object 1.

In the present invention, the work table 20 is provided for 3D printing the object 1.

In the present invention, the work position control unit 60 is provided to adjust the printing position of the object 1 by moving the work table 20.

In addition, in the present invention, the magnetic particle inspection unit 100 is provided to inspect whether the object 1 printed on the work table 20 is defective using magnetic particles.

The controller 200 controls the movement of the head unit 10 and the work position control unit 60, and generates and transmits signals to control the sequential operation of each device component, which will be described later, and requires Perform the preceding analysis process.

In one embodiment of the present invention, the head portion 10 includes a head base 11, a welding torch 12, a wire feeder 13, a weaving portion 14, and a head, as shown in FIGS. 2 and 3A. Includes East (15).

In the above embodiment of the present invention, the welding torch 12 is provided for 3D printing.

And in the embodiment of the present invention, the wire feeder 13 is provided to supply material to the welding torch 12. In the present invention, the wire feeder includes supplying not only wire but also a metal tube containing metal particles.

In the above embodiment of the present invention, the weaving unit 14 is provided to move the welding torch 12 left and right at a given speed with an amplitude of 5 to 15 mm.

Additionally, in the embodiment of the present invention, the head moving unit 15 is provided to move the head base 11 and implement 3D printing.

Here, the head unit 10, the work table 20, the magnetic particle inspection unit 100, the defect analysis unit 120, and the defect repair unit 130 are provided inside the chamber, and in some cases, there may be no chamber.

And in one embodiment of the present invention, the head moving unit 15 includes a head rotating base 151, a head lifting base 152, a first head horizontal moving unit 153, a second head horizontal moving unit 154, and a head. It includes a lifting part 155 and a head rotation part 156.

In the above embodiment of the present invention, the head rotation base 151 is rotatable inside the head base 11.

In addition, in the embodiment of the present invention, the head lifting base 152 is provided to be able to move up and down on the head rotating base 151.

In the above embodiment of the present invention, the first head horizontal moving part 153 is provided to move the head base 11 in the front and back horizontal direction.

And in the embodiment of the present invention, the second head horizontal moving unit 154 is provided to move the head base 11 in the left and right horizontal directions.

The second head horizontal moving unit 154 moves the first head horizontal moving unit 153 in the left and right horizontal directions to move the head base 11.

The head lifting mechanism 155 is provided to raise and lower the head lifting base 152.

Additionally, the head rotation driving unit 156 is provided to rotate the head rotation base 151.

And in the embodiment of the present invention, the weaving unit 14 includes a weaving tilting guide 141, a weaving rotation block 142, and a weaving tilting driving unit 143.

The weaving tilting guide 141 has a certain arc and is provided at the lower end of the head rotation base 151.

And the weaving rotation block 142 has a welding torch 12 mounted at its bottom and is movable along the weaving tilting guide 141.

The weaving tilting driving unit 143 is provided to move the weaving rotation block 142 along the weaving tilting guide 141.

In one embodiment of the present invention, the weaving unit 14 moves the welding torch 12 in a zigzag manner and prints an object.

The weaving unit 14 and the head moving unit 15 position the central point of the arc of the weaving tilting guide 141 to coincide with the part where the object to be inspected is printed.

Meanwhile, the head portion 10' of another embodiment of the present invention,

As shown in FIG. 3B, it includes a welding torch 12', a wire feeder 13', and a router or robot 11'.

In the above embodiment of the present invention, the welding torch 12' is provided for 3D printing.

And in the above embodiment of the present invention, the wire feeder 13' is provided to supply material to the welding torch 12'.

In the embodiment of the present invention, the router (FIG. 3a) or robot 11' (FIG. 3b) is composed of multiple axes or multiple joints to move the welding torch 12', and operates in multiple directions such as up and down, left and right, and joint rotation. Since linear movement and rotational movement are possible simultaneously, the direction and position of the welding torch 12' can be freely moved.

Also, as shown in FIGS. 2 and 3A and 3B, in each embodiment of the present invention, the work position adjusting unit 60 includes a work rotating unit 61 and a work tilting unit 62.

This work position adjusting unit 60 is applied to the head units 10 and 10' of each embodiment.

The work rotation unit 61 is provided to rotate the work table 20 based on the first extension line passing through the head unit 10 and the work table 20.

And the work tilting unit 62 is provided to tilt the work table 20 based on a second extension line orthogonal to the first extension line.

Here, the work rotation unit 61 includes a work rotation motor 611 and rotates the work table 20.

Additionally, in the embodiment of the present invention, the work tilting unit 62 includes a work tilting frame 621, a work tilting rotation unit 622, and a work tilting motor 623.

The work tilting frame 621 is provided with a work rotation motor 611.

And the work tilting rotation unit 622 rotatably connects both ends of the work tilting frame 621.

The work tilting motor 623 is provided to rotate the work tilting frame 621.

Accordingly, the work table 20 can be rotated by the work rotating unit 61 or tilted by the work tilting unit 62 to print an object and perform a magnetic particle inspection.

Here, in the embodiment of the present invention, the welding torch 12 is provided to be detachable by a fastening part 70.

As shown in FIG. 4, the fastening part 70 includes a fastening body 71 and a fastening mechanism 72.

The fastening body 71 has a plurality of branches at one end, has elasticity in the radial direction, and a fastening groove 71a is formed along the outer peripheral surface.

In addition, the fastening tool eastern part 72 is provided to fasten the welding torches 10 and 10' by expanding one end of the fastening body 71 on which the fastening groove 71a is formed outward.

Conversely, when one end of the fastening body 71 in which the fastening groove 71a is formed by the fastening mechanism 72 is moved inward, the welding torches 10 and 10' can be separated.

As shown in FIG. 3, in the embodiment of the present invention, the head unit 10 further includes a process tool unit 73 and a process tool supply unit 74.

After work is completed by the welding torch 10, various process tools for subsequent processes are placed in the process tool unit 73.

And the process tool supply unit 74 separates the welding torches 10 and 10' fastened by the fastening unit 70 by gripping them, or grips one of the process tools of the process tool unit 73 to separate the welding torches 10 and 10' from the fastening part 70. It is provided for fastening to (70).

Meanwhile, in the case of the head unit 10' in another embodiment of the present invention, only the process tool unit 73 is provided, and the robot 11' moves directly to the process tool unit 73 to fasten and separate the necessary process tools. .

The device configuration driven for all processes according to the present invention is controlled by a drive control signal generated by the controller 200.

In an embodiment of the present invention, the magnetic particle inspection unit 100 includes a magnetic particle inspection means 30, a defect analysis means 40, and a defect repair means 50, as shown in FIG. 5.

As an embodiment of the present invention, the magnetic particle inspection means 30 includes a magnetic flux supply unit 31, a magnetic particle supply unit 32, a magnetic particle detection unit 33, and a magnetic particle inspection light source 34.

Preferably, the magnetic flux supply unit 31, the magnetic particle supply unit 32, and the magnetic particle inspection light source 34 may be mounted on the head unit 10, and the magnetic flux supply unit 31 and the magnetic particle detection unit 33 It can be mounted on the work tilting frame (621).

The magnetic flux supply unit 31 may be a pair of magnetic flux supply pads 311 and 312 (penetrating type) that contact the object 1 and supply magnetic flux, or a magnetic flux supply coil (coil type). In the case of a magnetic flux supply coil, the coil on one side may surround a part of the object (1), and the coil on the other side may surround the other side of the object to supply magnetic flux.

The magnetic particle supply unit 32 preferably supplies magnetic particles suspended in a liquid phase, for example, supplies fluorescent magnetic particles suspended in an appropriate solution (eg, white kerosene) to the surface of the object.

The magnetic particle inspection light source 34 is an ultraviolet light and includes a black light lamp.

The magnetic particle detection unit 33 supplies magnetic flux to the object 1 through a pair of pads 311 and 312 of the magnetic flux supply unit 31, and after fluorescent magnetic powder is applied by the magnetic particle supply unit 32, the magnetic particle inspection light source 34 ), when a light source such as UV is supplied, the distribution of generated fluorescence is detected.

At this time, the magnetic particle detection unit 33 may be a CCTV, a vision sensor, etc., but is not limited thereto.

Preferably, the defect analysis means 40 is included in the controller 200.

And the defect analysis means 40 analyzes the signal received from the magnetic particle detection unit 33 and determines whether there is a defect (or discontinuity) according to a predetermined logic (or program). Supplementary visual inspection may be required, and if necessary, it is advisable to contact the pad from at least two directions to finally determine whether there is a defect.

The defect repair means 50 performs repair of discontinuities according to the results analyzed by the defect analysis means 40.

In an embodiment of the present invention, the magnetic flux supply unit 32 is capable of moving in the horizontal and vertical directions through the horizontal movement unit 313 and the vertical movement unit 314, respectively, in at least two directions with respect to the object 1. It is desirable to be able to supply magnetic flux.

And the magnetic particle removal unit 35 is provided to remove magnetic particles sprayed around the object from which the magnetic flux has been removed.

If the received signal has a pattern or signal value different from the normal pattern, the defect analysis means 40 analyzes through a predetermined program whether the received signal is out of range by comparing it with the reference pattern or reference signal value, and determines whether a discontinuity occurs. Decide whether it was done or not.

The properties of the discontinuity may be expressed in various ways in terms of size, shape, shape, etc., and in the present invention, these various discontinuity properties are preferably registered and managed in the database (DB) 210.

Therefore, this discontinuity attribute information is determined by the discontinuity attribute analysis unit 202 of the controller 200, which will be described later, by referring to a table that maps the attribute information stored in the DB 210 and the repair means for the corresponding attribute to determine a specific defect repair means. enable it to be selected.

The defect repair means 50 is equipped to repair the discontinuity. For example, a cutting machine, a polisher, a gap filler, etc. may be used here, and a suitable repair means may be used according to the results analyzed by the defect analysis means 40. Allow this to be selected.

A preferred embodiment of the present invention further includes auxiliary measuring means 250.

Examples of the auxiliary measurement means include an eddy current flaw detector, an ultrasonic flaw detector, and a phased array ultrasonic flaw detector.

The auxiliary measuring means 250 is used to determine and auxiliary measure a measuring means capable of more suitable inspection for specific defects in the stacking pattern, surface, or side or inner surface of an object during printing, according to a predetermined logic.

In addition, in a preferred embodiment of the present invention, the magnetic particle inspection unit 100 further includes a cooling temperature control sensor 36.

The cooling temperature sensor 11 is provided to control the cooling temperature of the object, and the controller 200 analyzes the temperature information received from the cooling temperature sensor 11 to determine the temperature or material of the object required for the corresponding measurement means. Alternatively, in order to satisfy the cooling conditions and cooling speed required by the product manufacturing procedure, an air sprayer or a cooler (e.g., nitrogen cooler) (not shown) is operated depending on the temperature conditions.

And in a preferred embodiment of the present invention, the magnetic particle inspection unit 100 further includes a surface pretreatment means 80.

The surface pretreatment means 80 is used to remove beads formed on the surface of the weld layer in order to clearly determine whether there is a defect before performing magnetic particle inspection, and to remove chips formed during this process, It includes a bead removal unit 81 and a chip removal unit 82.

In this way, the bead removal unit 81 is provided to remove beads from the surface of the object, and for example, a surface polisher, a surface (or flattening) cutter, etc. may be included here.

In addition, the chip removal unit 82 is provided to remove chips generated during the bead removal process by the bead removal unit 81, and any configuration that can remove chips by external force such as an air blower or vacuum suction device. May be included in the present invention.

In the present invention, preferably, when the material of the wire (or metal particle) supplied by the wire feeder 13 or 13' is replaced, the controller 200 controls the magnetic flux supply unit 31 to change the size of the magnetic flux. .

In a preferred embodiment of the present invention, the magnetic particle inspection unit 100 further includes coordinate display means 91.

The coordinate display means 91 displays the discontinuity with coordinates on the CAD, and is linked to the magnetic particle inspection sensor 30 and the defect analysis means 40 to display the location of the discontinuity on the CAD.

As a result, the inspector can not only confirm the location of the discontinuity on the CAD, but also enable appropriate repair work to be sequentially performed at the specified location of the object by the subsequent defect repair means 40.

In a preferred embodiment of the present invention, the magnetic particle inspection unit 100 further includes a demagnetization means 92.

The demagnetizing means 92 is used to demagnetize the object after completion of the inspection. If magnetic flux remains in the object, it may have a negative effect on the subsequent process or inspection, so it is sufficient to use a known demagnetizing device. .

In addition, in a preferred embodiment of the present invention, the magnetic particle inspection unit 100 further includes marking means 93.

The marking means 93 displays the position of the discontinuity at the corresponding position of the object, and is linked with the coordinate display means 91 to display the corresponding position on the actual object.

For example, the marking means 93 can mark using a laser, etc. rather than direct marking, and it is possible to repair defects using a defect repair means 50 that can recognize the marking area.

Such as magnetic particle detection sensor 30, defect repair means 50, cooling temperature sensor 11, surface pretreatment means 80, coordinate display means 91, demagnetization means 92, marking means 93, etc. It can be physically mounted together on the head unit 10 or driven while being supported on a separate structure, and these various components are sequentially driven by logic determined by the controller 200, and preferably the fastening unit ( It is desirable that it be fastened to the head unit when the process is started by 70) and stored in the process tool unit 73 when use is completed to maintain a standby state for subsequent procedures.

Figure 6 is a detailed configuration diagram for another embodiment of the controller 200 according to the present invention, and Figure 7 shows the configuration of a system for non-destructive inspection using a scan camera as another embodiment of the present invention.

In the present invention, the signal receiver 201 receives a signal transmitted from the magnetic particle sensor 30 and, if necessary, receives a signal transmitted from the line scan camera 300.

In an embodiment of the present invention, the discontinuity attribute analysis unit 202 analyzes the properties of the analyzed discontinuity, as described above.

Basically, the attribute information stored in the DB 210 is referred to, the attribute or the attribute most similar to it is extracted, and then analyzed with reference to a table that maps the repair means for the attribute to determine a specific defect corresponding to the attribute. This is to ensure that conservative measures can be selected.

In an embodiment of the present invention, the inspection area characteristic determination unit 203 determines the characteristics of the inspection area formed by the printed weld layer.

At this time, the inspection area represents the plane or/and side (outer surface or/and inner surface) formed by the weld layer, and in this case, the weld layer means at least one layer, preferably 3 to 5 layers.

The inspection area characteristic determination unit 203 first allows selection of the optimal measurement means for each plane characteristic of the object 1, and at this time, the plane characteristic information (p) includes the length (s ₁ ) and thickness (s ₂ ) of the plane. , area (s ₃ ), … , shape (s _m ), etc., and a measurement method optimized for inspection of a stacked plane with specific characteristics should be selected.

For example, when dividing characteristic information into n groups (p ₁ ~ p _n ), when a specific measurement method for each group shows a positive correlation that increases accuracy during the measurement process, this can be mapped between the group and the measurement method. You can.

For this purpose, the two-dimensional cross-sectional information of the CAD drawing entered into the device is stored in the DB, the cross-sectional information of the stored two-dimensional plane is extracted, and through experiments in advance as described above according to the characteristic information of the plane to be formed when each weld layer is laminated. By comparing and analyzing the characteristic information-measurement means mapping table established and stored in the DB, it is possible to determine which group the surface characteristics of the weld layer belong to and select the optimal measurement means. .

In addition, of course, in the embodiment of the present invention, the inspection surface characteristic determination unit 203 may refer to characteristic information about the side as well as characteristic information about the plane of the object 1.

In other words, characteristic information about the side of a 3D CAD drawing (e.g., width (t ₁ ), depth (t ₂ ), … shape (t _m )) is grouped (characteristic information is divided into n groups (q ₁ ~ q _n ) ), when a specific measurement method for each group shows a positive correlation that increases accuracy during the measurement process, this can be mapped between the group and the measurement method.

In this case, the head 10 and the worktable 20 are moved along the a (a = 1, 2, 3, 4, 5) axis and b (b = 1, 2) axis, respectively, to measure the side of the object and the measuring means. The controller 200 controls the operation so that it can be aligned vertically.

Likewise, the 3D side information of the CAD drawing entered into the device is stored in the DB, the stored 3D side information is extracted, and the database is established through experiments in advance as described above according to the characteristic information of the side to be formed when each weld layer is laminated. By comparing and analyzing each other by referring to the characteristic information-measurement means mapping table stored in make it possible

The measurement/repair means determination unit 204 stores (attribute/characteristic information)-(measurement information) experimentally stored in the DB according to the properties or characteristics determined by the discontinuity attribute analysis unit 202 and the inspection area characteristic determination unit 203. /Measurement means) Refer to the mapping table to determine the measurement or maintenance measure that matches the relevant attribute or characteristic.

The measurement means and maintenance means determined in this way are each sequentially driven according to a determined process in accordance with the control signal generated by the control signal generation/transmission unit 206.

In an embodiment of the present invention, the environmental information analysis unit 205 stores environmental information (e.g., temperature, humidity, pressure, etc.) suitable for measurement by measurement means in advance in a database and analyzes environmental conditions under which actual printing will be performed.

Only when the environmental conditions for actual printing satisfy the environmental conditions required for the corresponding measuring means stored in the above DB, the controller 200 replaces the specific measuring means determined by the measurement/maintenance means determining unit 204 as described above. So that it can be measured.

In addition, as shown in FIG. 7, a preferred embodiment of the present invention may further include a scan camera 300 to more accurately measure the side of the object 1, if necessary.

The scan cameras 300 are preferably line scan cameras, and preferably one to four can be installed in the outer peripheral area of the object while maintaining the same angle.

When one is installed, the scan camera 300 must be able to rotate 360 degrees around the object, when two are installed, it can rotate 90 degrees, when three are installed, it can rotate 120 degrees, and when four are installed, the scan camera 300 must be able to rotate 360 degrees around the object. In this case, each may be configured to rotate by 90 degrees. The symbol 310 represents lighting.

The image obtained from the scan camera 300 is sent to the controller 200 and analyzed by the image analysis unit 207 through an image processing program using predetermined logic.

At this time, the image analysis unit 207 can compare the two-dimensional image of the side of the three-dimensional object already stored in the DB 210 with the image obtained from the scan camera 300 to find the defective area.

The location information of the defective part is expressed as coordinates (mapped to the coordinates of each point of the 3D object) on the 2D image, thereby making it possible to specify the defective part of the 3D object.

As described above, the analysis results obtained from the image analysis unit 207 are comprehensively analyzed together with the results obtained through other measurement means, making it possible to analyze and repair even very fine defects with high precision.

As described above, in the system according to the present invention, a series of processes such as quality inspection and repair work can be performed by one worker, and since non-destructive inspectors are not directly inserted into the work space, work safety is high and inspection is carried out automatically. This makes automatic non-destructive testing for 3D printing work inspection possible, which can increase the reliability of inspection.

Combinations of each block of the block diagram and each step of the flow diagram attached to the present invention may be performed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general-purpose computer, special-purpose computer, or other programmable data processing equipment, the instructions performed through the processor of the computer or other programmable data processing equipment are shown in each block of the block diagram or flow diagram. Each step creates the means to perform the functions described. These computer program instructions may also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular manner, so that the computer-usable or computer-readable memory The instructions stored in can also produce manufactured items containing instruction means that perform the functions described in each block of the block diagram or each step of the flow diagram. Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer and can be processed by the computer or other programmable data processing equipment. Instructions that perform processing equipment may also provide steps for executing functions described in each block of the block diagram and each step of the flow diagram.

Additionally, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). Additionally, it should be noted that in some alternative embodiments it is possible for the functions mentioned in the blocks or steps to occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially simultaneously, or the blocks or steps may sometimes be performed in reverse order depending on the corresponding function.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope shall be construed as being included in the scope of rights of the present invention.

10, 10': Head part 20: Workbench
30: magnetic particle inspection means 31: magnetic flux supply unit
32: magnetic particle supply unit 33: magnetic particle detection unit
40: Defect analysis means 50: Defect repair means
60: Work position adjustment part 70: Fastening part
80: surface pretreatment means 91: coordinate display means
92: Delettering means 93: Marking means
100: Magnetic particle inspection department

Claims (10)

Head part for 3D printing an object;
A workbench for 3D printing objects;
a work position control unit for moving the work table to adjust the printing position of the object;
Cooling temperature sensor for controlling the cooling temperature of the object; and
It includes a magnetic particle inspection unit to inspect whether the object printed on the workbench is defective using magnetic particles,
The magnetic particle inspection unit includes a magnetic flux supply unit that provides magnetic flux to the object, a magnetic particle supply unit that sprays magnetic particles to the object to which the magnetic flux has been supplied, and a magnetic particle detection unit that detects the distribution pattern of the magnetic particles arranged by the supplied magnetic flux. It includes a defect analysis means for determining a discontinuity by analyzing a signal received from a magnetic particle inspection sensor, and a defect repair means for repairing the discontinuity according to the results analyzed by the defect analysis means,
The head unit includes a welding torch for 3D printing, a wire feeder for supplying material to the welding torch, and a multi-axis router or multi-joint robot to move the welding torch,
The welding torch is provided to be detachable by a fastening part,
The fastening part includes a fastening body having a plurality of branches at one end, elasticity in the radial direction, and a fastening groove formed along the outer circumferential surface, and a fastening drive part for fastening a welding torch by expanding one end of the fastening body on which the fastening groove is formed outward. An automatic non-destructive inspection system for 3D printers using magnetic particle inspection, including: delete The method of claim 1, wherein the magnetic flux supply unit,
An automatic non-destructive inspection system for 3D printers using magnetic particle detection that includes a pair of magnetic flux supply pads or a magnetic flux supply coil. The method of claim 3, wherein the magnetic flux supply unit is capable of moving in the horizontal and vertical directions through the horizontal moving part and the vertical moving part, respectively, so that the magnetic flux can be supplied from at least two directions with respect to the object (1). An automatic non-destructive inspection system for 3D printers using magnetic particle detection. According to paragraph 1,
An automatic non-destructive inspection system for 3D printers using magnetic particle detection, further comprising a magnetic particle removal unit to remove magnetic particles sprayed around the object from which the magnetic flux has been removed. delete delete The method of claim 1, wherein the working position adjusting unit,
A work rotation unit for rotating the work table based on a first extension line passing between the head unit and the work table; and
An automatic non-destructive inspection system for a 3D printer using a magnetic particle inspection method including a work tilting unit for tilting the work table based on a second extension line orthogonal to the first extension line.
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