JP2728143B2 - Injection molding machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine having a molded article inspection function for automatically judging the quality of molded articles (products).

[Prior Art] When performing a molding operation by an injection molding machine by an automatic operation, it is meaningless if a molded product becomes a pile of defective products, so that a large number of molding operation conditions which are a factor in determining the quality of the product. Is set finely. A microcomputer that controls the entire molding machine (hereinafter referred to as a microcomputer)
Is configured to execute automatic operation with reference to measurement data from various sensors based on a preset molding operation condition value to continuously mold a molded article.

Further, together with the set values of the molding operation conditions described above, an upper limit value and a lower limit value are set in accordance with the respective set values,
While performing automatic molding, actual measurement was performed to determine how each molding operation condition value changed.
If it is within the range of the lower limit, it is judged as good, and if it is out of the set upper limit or lower limit, it is judged as defective, and if it is judged as defective, the molded product at that time is approved at the time of opening and removing the mold. Recently, an injection molding machine with a so-called automatic inspection function, which is brought to a place other than the product accumulation (loading) place, has begun to spread.

In the technology proposed by the present applicant as Japanese Patent Application Laid-Open No. 3-36012 as an injection molding machine with an automatic inspection function, a microcomputer that controls the entire injection molding machine determines measurement data of each molding operation condition value in a predetermined manner. Capture the number of shots,
This is statistically processed to determine the upper and lower limits.

[Problems to be Solved by the Invention] By the way, in the technical field of injection molding, there are many unclear matters such as details of correlation of each molding operation condition and details mechanism of resin behavior. Research is ongoing, but the set values of the molding operation conditions described above and the upper and lower limits set in the injection molding machine with an automatic inspection function are currently set by operators with rich experience and knowledge. Relying on In view of this point, in the above-mentioned prior application, upper and lower limit values can be automatically set by statistically calculating actual measurement data when molding non-defective products.

However, all of the conventional monitor items for quality determination correspond to the operating conditions of the injection molding machine, and do not include items related to the outer shape and appearance of a molded product that are closely related to molding quality. Before the mold is opened and the molded product is taken out of the mold, pass / fail judgment is performed.
It was a pass / fail decision. For this reason, the allowable range tends to be set narrow in order to reliably eliminate defective products, and it is pointed out that molded products that are practically acceptable as good products are mixed in molded products that are eliminated as defective products. was there.

The present invention has been made in view of the above points, and an object of the present invention is to provide a molded article inspection apparatus of an injection molding machine capable of automatically determining appropriate non-defective / defective products.

Means for Solving the Problems In order to achieve the above object, the present invention includes a microcomputer that drives and controls each part of the molding machine based on each set molding operation condition value and measurement information from each sensor. In order to determine the quality of the molded product during continuous automatic operation, the microcomputer compares the upper limit value and the lower limit value of a plurality of predetermined operating condition monitor items with the actually measured value, and determines the molded product based on the comparison result. In an injection molding machine having a function of judging the quality of an image, an image pickup means for picking up an image of a molded product taken out for each shot is provided, and image data sent from the image pickup means is converted to obtain a length, area, Direction, concentration,
An image recognizing means for performing image recognition by extracting a feature quantity such as a number or a pattern is provided in the microcomputer or separately from the microcomputer, and the molded article outline / appearance information based on the feature quantity extracted by the image recognizing means is provided. The microcomputer recognizes the actual shots together with the actual measured values of the other operation condition monitor items in association with the shot, and obtains the short shot,
Judgment is made in accordance with the individual failure phenomena such as burrs, sink marks, cracks, whitening, burns (black spots), and peeling layers. The quality of the molded product is determined by using the imaging device, and the molded product is imaged by the imaging means. The molded product is carried out of the machine main body by the take-out machine that takes out the molded product from the mold when the mold is opened, and is molded by the take-out machine. It is configured such that the process is performed in a state where the product is held, or in a state where the molded product taken out of the mold when the mold is opened is transported outside the machine main body and placed at a predetermined position.

[Operation] The microcomputer incorporated in the injection molding machine captures the actual measurement value of each monitor item related to operating conditions such as injection conditions for each shot (each cycle). On the other hand, during the mold opening / ejection process, the molded product taken out of the mold by the take-out machine is imaged by an imaging means such as a video camera,
The still image information is appropriately converted, and the feature amount is extracted by the image recognition unit. The microcomputer fetches information on the outer shape and appearance properties of the molded product by the image recognition means as monitor items associated with the shot. Then, the microcomputer performs a determination process on the measured values of a plurality of monitor items including data relating to the external shape and appearance properties of the molded product, and when the microcomputer determines that the product is non-defective, carries the molded product of the shot to a proper product storage area, When it is determined to be a non-defective product, for example, the take-out machine or the like is controlled so as to put the molded product of the shot into a defective product accumulation location.

In this way, the automatic quality judgment can be performed in real time based on a large number of monitor items including the outer shape and appearance properties of the molded product, and the accuracy of the quality judgment is improved. In other words, the factors closely related to the quality of the molded product, such as the external shape and appearance properties of the molded product that were not used for the automatic inspection before, are completely grasped as monitor items, so the dimensions and
Quality determination such as deformation can be performed more accurately.

[Embodiment] An embodiment shown in FIGS. 1 to 3 in which the present invention is applied to an in-line screw type injection molding machine will be described below. In the present embodiment, a hydraulic drive type injection molding machine will be described as an example. However, the present invention can be similarly implemented in a servo motor drive type injection molding machine.

FIG. 1 is an explanatory view showing a schematic configuration of a main part of an injection molding machine. The upper left part of the figure shows a mold opening / closing mechanism system. In the illustrated part, 1 is a base, 2 is a fixed die plate fixed on the base 1, 3 is a base 1
Support plate installed on the slide base 1a extended to
Reference numeral 4 denotes a plurality of tie bars provided between the fixed die plate 2 and the support board 3. A mold clamping cylinder (hydraulic cylinder) 5 as a mold opening / closing drive source is fixed to the support board 3, and a distal end of a piston rod 5 a of the mold clamping cylinder 5 is connected via a known toggle link mechanism 6. Tie bar 4
Is connected to the movable die plate 7. By moving the piston rod 5a back and forth, the movable die plate 7 approaches or retreats from the fixed die plate 2.

The fixed die plate 2 and the movable die plate 7 are provided on opposite surfaces of the fixed die plate 2 and the movable die plate 9, respectively.
And are attached. At the time of the mold closing stroke during the molding cycle, the toggle link mechanism 6 is extended by advancing the piston rod 5a to advance the movable die plate 7, and the two dies 8, 9 are brought into close contact with each other. , A predetermined mold clamping force is applied. On the other hand, at the time of the mold opening process during the molding cycle, the toggle link mechanism 6 is folded and the movable die plate 7 is retracted by retracting the piston rod 5a.
Are separated from each other, and the molded product is taken out by a known eject mechanism (not shown) and an automatic molded product take-out machine 10. Although not shown, the automatic take-out machine 10 includes, for example, a hand portion for holding a molded product and an arm portion for turning and moving the hand portion up and down, and is controlled by a microcomputer 30 described later.

In the present embodiment, the above-described automatic take-out machine 10 includes:
With the molded product 50 taken out for each shot taken out of the machine body and held with its own hand,
The molded article 50 is positioned and stopped in front of the video camera 51. And the video camera 51 is a molded product 50
And sends the still image information S9 to an image recognition unit 61 via an image processing / storage unit 60 described later. In addition, 52 is a background plate and 53 is a light source. Here, the molded article 50 to be a subject can be directed to an arbitrary surface to the video camera 50 by controlling the driving of the hand unit, and one molded article 50 can be imaged from a plurality of plane directions as needed. At this time, since the molded product 50 is held by the hand portion of the automatic take-out machine 10, the positioning accuracy is relatively high.

Then, as described later, when the microcomputer 30 described later comprehensively determines each monitor data and determines a non-defective product, the molded product 50 of the shot is placed on, for example, a belt conveyor 54 by the automatic unloader 10, and the If a good product is judged, the molded product 50 of the shot is
This causes the defective product to be charged into the storage 55.
FIG. 2 is a perspective view showing a state in which the molded product 50 held by the hand unit 10a of the automatic unloading machine 10 is imaged.

The upper right part in FIG. 1 shows an injection mechanism system, in which part 12 is a heating cylinder, 13 is a screw arranged in the heating cylinder 12 so as to rotate and move back and forth, and 14 is a heating cylinder 12 A nozzle 15 wound around the outer periphery of the heating cylinder 12, a hopper 16 for supplying the resin material to the rear of the screw 13, and a motor 17 serving as a rotational drive source of the screw 13 In this embodiment, for example, an electromagnetic motor is used.
It can be replaced with a hydraulic motor etc.), 18 is a screw
13 is an injection cylinder (hydraulic cylinder) for controlling the forward / backward movement of 13. As is known, the resin material supplied from the hopper 16 is melted while being transferred to the tip side of the screw 13 while being kneaded and plasticized by the rotation of the screw 13, and as the molten resin is stored at the tip side of the screw 13, The screw 13 retreats while controlling the back pressure, and when one shot of the molten resin is stored at the tip end of the screw 13, the screw rotation is stopped. Then, after a predetermined time, when the injection start timing is reached, the screw 13
Is driven forward, and the molten resin is injected into the cavity between the closed molds 8 and 9.

20 is an injection pressure detection sensor composed of a hydraulic measuring head, etc.
21 is an injection stroke detection sensor composed of an encoder, etc.
Reference numeral 22 denotes a screw rotation detection sensor including a rotary encoder, etc., reference numeral 23 denotes a temperature detection sensor for detecting the temperature of the heating cylinder 12, reference numeral 24 denotes a temperature detection sensor for detecting a molten resin temperature at the tip of the nozzle 14, and reference numeral 25 denotes a type including an encoder. An opening / closing stroke detection sensor, 26 is a mold clamping pressure detection sensor composed of a hydraulic pressure measuring head and the like, 27 is an operation detection sensor of the automatic take-out machine 10, and measurement information signals S1 to
S8 and measurement information signals from other sensors (not shown) are sent to a microcomputer 30 to be described later, after performing appropriate input conversion processing as necessary.

30 is a microcomputer that controls the operation of the entire machine, etc.
It performs control of the entire molding process such as mold opening / closing operation, charging operation, injection operation, etc., non-defective / defective product determination processing, and various calculation processing such as statistical calculation of measurement data described later. The microcomputer 30 is actually a RO that stores various I / O interfaces, a main control program, and various fixed data.
M, RAM for reading and writing various flags and measurement data, etc., CPU (Central Processor Unit) for overall control
Although various processes are executed in accordance with various programs created in advance, in the present embodiment, the molding condition setting storage unit 31, the molding process control unit 3
2. The following description is given assuming that the processing unit 33 includes functional units such as an actual measurement value storage unit 34, an upper / lower limit setting storage unit 35, and a comparison operation / determination unit 36.

The molding condition setting storage unit 31 stores various molding condition values input by the key input means 70 or other appropriate input means in a form which can be rewritten after being processed as necessary. The molding conditions include, for example, the relationship between the screw position during the charge stroke, the screw rotation speed, and the back pressure, suck-back control conditions, and the injection start point (position).
From the injection pressure condition to the holding pressure switching point (position), the secondary injection pressure (holding pressure) condition from the holding pressure switching time to the holding pressure end time, the band heater temperature of each part, Mold closing stroke and speed, mold clamping force, mold opening stroke and speed, eject control conditions, automatic (product) unloader control conditions, and the like.

The molding process control unit 32 is built in the microcomputer 30 based on the measurement information from the sensors 20 to 27 and the like based on the molding process control program created in advance and the setting condition values stored in the molding condition setting storage unit 31. While controlling the corresponding drive source via the driver group 41 while referring to the time measurement information from the clock thus obtained, a series of molding steps is executed. In FIG. 1, the drive signal D1 of the driver group 41 controls the drive of the mold clamping cylinder 5 via the control valve 42, the drive signal D2 controls the drive of the electric heat source of the band heater 15, and the drive signal D3 The drive control of the motor 17, the drive signal D4 controls the drive of the injection cylinder 18 via the control valve 43, and the drive signal D5 drives the drive source (eg, motor, air cylinder, etc.) of the automatic unloader 10. In addition, another drive signal drives and controls an appropriate drive source (not shown).

The actual measured value storage unit 34 stores all the actual measured values x of the operating condition monitor items in the recording area over a predetermined number of consecutive shots. The monitoring items to be taken are roughly classified into time monitoring items, position monitoring items, rotation speed monitoring items, speed monitoring items, pressure monitoring items, temperature monitoring items, and power monitoring items, and correspond to the molding operation condition setting items described above. Factors that overlap with this part and closely relate to the quality of the molded product are preset as operating condition monitor items. The number of operation condition monitor items is arbitrary, but in this embodiment, the number of operation condition monitor items is about 30 to 50,
The measurement information from to 27 and the time information from the clock built in the microcomputer 30 are converted if necessary and sequentially stored.

Further, in the present embodiment, in addition to the above-mentioned monitor items, monitor items for the outer shape and appearance properties of the molded product are set. The number of monitor items for the external shape and appearance properties of the molded article is also arbitrary, but in this embodiment, the number is about 5 to 6 or so. The monitor items of the external shape and appearance properties of molded articles include short shots (insufficient amount of resin), burrs, sink marks, cracks, whitening, burns (black spots), and peeling layers, which are defective phenomena of molded articles. Recognition and discrimination by the recognition unit 61 are relatively easy. In addition to the above, monitor items for external appearance and appearance properties include bubbles, silver strips, weld lines, flow marks, jetting, cracks (cracks), crazing (cracks), black strips, discoloration, poor gloss, poor transparency, and surfaces. Examples include cloudiness, uneven color, scratches, stringing, poor transfer, and deformation (warpage, twisting). Then, the actually measured value data of the above-described molded article outer shape / appearance property monitor item is transferred from the image recognition unit 61 to the actually measured value storage unit 34 of the microcomputer 30 in the form of a digital signal representing a feature amount, and It is stored in association with the actual measurement value of the operating condition monitor item.

When the data stored in the measured value storage unit 34 reaches the predetermined number of sampling shots (when the trial shot period in which the molding of a non-defective product is guaranteed ends), the arithmetic processing unit 33 calculates the measured value for each operation condition monitor item. x is statistically processed, and a variation range R = (x _max −x _min ) of the measured value x and a median value Me = (x _min + R / 2) of the measured value x, and / or Is calculated first, and then the upper and lower limits of each monitor item are determined by the above calculation result and a correction coefficient a which is appropriately set in advance by an empirical value. Upper limit = Me + a · R / 2 Lower limit = Me−a Calculate as R / 2 or upper limit = + a 3σ / 2 lower limit = -a 3σ / 2. The upper limit value and the lower limit value for each monitor item calculated in this way are transferred to the above-described upper / lower limit value setting storage unit 35 and stored. For the method of automatically setting the upper and lower limits, if necessary, refer to the above-mentioned prior application (Japanese Patent Application Laid-Open No. 1-169999).

Similarly, the upper and lower limit values of the actually measured value data y of the monitor of the external shape and appearance properties of the molded product are set by the same processing for those having an allowable range. Among the monitor items of the external shape and appearance properties of molded products, items that are always judged to be defective if their occurrence is recognized (Severe accuracy /
Although almost all molded product external appearance / appearance property monitor items correspond to the appearance required, the setting of upper and lower limit values is meaningless, so this processing is not performed.

The comparison operation / judgment unit 36 includes an upper / lower limit setting storage unit 35.
Is compared with the actually measured value data of the latest shot (for example, transferred from the actually measured value storage unit 34) to determine whether the actually measured value is within the upper / lower limit value range (within the allowable range). As well as the presence or absence of data indicating the occurrence of a molded product external appearance / appearance property monitor that must be determined to be defective regardless of the degree as described above.
Then, when it is determined that the molded product 50 is defective, the molding process control unit 32 recognizes this fact, and the molding process control unit 32 controls the drive of the automatic take-out machine 10, and as described above, the molded product 50 by the latest shot is used. The defective product is put into a predetermined defective product storage 55 as a defective product.

Next, an image processing system for a still image of the molded product 50 captured by the video camera 51 will be described. The still image information S9 sent from the video camera 51 is subjected to analog / digital conversion, shading correction, and the like in the image processing / storage unit 60, is temporarily stored in the form of a digital signal, and is sequentially transferred to the image recognition unit 61. You. The image recognizing unit 61 is actually constituted by a microcomputer (the microcomputer 30 may be provided with this function. However, in this embodiment, the load on the microcomputer 30 is reduced and the image processing is performed at a higher speed. A separate microcomputer is provided), and executes image processing based on a predetermined program.

That is, the image recognizing unit 61 performs necessary image pre-processing such as noise removal, contour extraction, thinning, and binarization of the input image data, and then performs length, area, direction, density,
The feature quantities such as the number and the pattern are extracted. The extracted feature quantity indicating the outer shape and appearance properties of the molded article is obtained by referring to the control table of “event-molded article outer appearance and appearance properties monitor item” in the image recognition unit 61 created in advance by case study. , And is recognized in association with each of the external shape and appearance property monitor items. The processing / recognition result is transferred from the image recognition unit 61 to the microcomputer 30 as an actually measured value (digital data indicating presence / absence or degree of external / inferior appearance failure) of the molded product external / appearance property monitor item.
It goes without saying that the image recognition unit 61 is provided with a data memory unit.

In FIG. 1, reference numeral 71 denotes a display device such as a color CRT display, which can display the processing result of the microcomputer 30 and the processing result of the image recognition unit 61 as necessary. The unit 63 sends one of the outputs to the display device 71. The input / instruction to the image recognition unit 61 and the display switching unit 63 is performed by the key input unit 70. 62 is an image recognition unit.
61 is an image display processing unit having a function of appropriately converting and temporarily storing image data. Reference numeral 72 denotes a printer such as a dot printer, which outputs the processing result of the microcomputer 30 as needed. Reference numeral 73 denotes an external memory such as a magnetic disk device, which exchanges information with the microcomputer 30 as necessary.

In the present embodiment having the above-described configuration, after the operation is started, it is determined that the shots are stable and the non-defective products are continuously formed. The above-described upper and lower limits for each monitor item for determining the quality of the product are set in the microcomputer 30. And after this, the microcomputer 30
Operating condition monitor items and molded product
Corresponds to the latest shot based on the upper / lower limit value of each monitor item corresponding to the appearance property monitor item, and the type of molded product outer shape / appearance property monitor item that should always be judged to be defective regardless of its degree Examine the actual measured value.
In this determination processing, the actual measurement value data of all the monitor items for which the allowable range is set are within the allowable range (upper / lower range).
, And, when there is no data indicating the occurrence of the monitor of the outer shape and appearance properties of the molded article which should always be determined to be defective irrespective of the degree, the molded article is determined to be non-defective,
Otherwise, it is determined to be defective. Then, based on the result of this determination, the microcomputer 30 executes the sorting control of the molded article transfer position.

FIG. 3 is an explanatory view showing a part of the printout of the actually measured value in a specific shot when the above-mentioned molded article inspection processing is executed, and includes a monitor item, an actually measured value (or presence or absence of data), a set value, and an upper limit. This shows a state in which the value, lower limit value, and good / bad determination mark are printed in the order of the monitor items (actually, a numerical value, a unit display, and a mark are printed on a blank portion). In the example shown in FIG.
Primary (injection) pressure, secondary pressure (holding pressure) switching position, primary injection time,
Cushion position (most forward position of screw), charge completion position (last position of screw), thermo (resin temperature at nozzle tip), charge time, cycle time, secondary pressure (holding pressure), ~ short shot, burr , Sink, crack, burn, etc. are set. In the example shown in the figure, an example is shown in which no allowable value is set for items other than “Sink” in the monitor of the external shape and appearance properties of the molded product.

As described above, in the present embodiment, the monitor item includes factors closely related to the quality of the molded product, such as the external shape and appearance properties of the molded product, which have not been used before the automatic determination of good / bad. Since the automatic determination of pass / fail is performed, the determination accuracy is greatly improved.

In the above-described embodiment, the data of the outer shape and appearance properties of the molded product recognized in real time are used only for the determination of good / defective of the molded product. Defect data of the external appearance and appearance properties of the molded product indicating occurrence are transferred to the molding condition setting storage unit 31, and the molding condition setting storage unit 31 refers to a correction table or the like and self-corrects the molding operation conditions. You can also do. For example, if short shots occur consecutively,
Since it is considered that the amount of resin charged into the cavity is insufficient, change processing such as increasing the charge amount, shifting the holding pressure switching point in the direction to increase the filling amount, or increasing the injection pressure / speed can be considered. . When burrs are continuously generated, the amount of resin charged into the cavity is considered to be excessive, so that a countermeasure reverse to the above can be considered. In the case of sink marks, the holding pressure may be increased. In this way, if the molding operation conditions are self-corrected according to the type of the defect in the external shape and appearance of the molded product, the precision of the molded product is further improved.

FIG. 4 relates to another embodiment of the present invention. In this embodiment, a video camera 51 and a light source 53 are arranged near the automatic take-out machine 10, and the video camera 51 and the light source 53 are provided.
Can be moved up and down by a drive source as appropriate. The video camera 51 and the light source 53 are lowered into the mold opening space when the mold is opened, and are held (attached) to the mold.
The molded product in the state is imaged, and the object (molded product) is held in the mold, so that imaging with extremely high positioning accuracy can be performed. However, in the present embodiment, since the imaging surface of the molded product is limited, it should be applied to a molded product in which the determination of the outer shape and appearance properties is allowed only on one surface of the molded product exposed from the mold. It should be noted that the video camera 51 and the light source 53 can be integrated with the automatic take-out machine 10 and can be moved up and down by the same drive source.

FIG. 5 relates to still another embodiment of the present invention. In the present embodiment, an image is taken while the molded article is placed on the belt conveyor 54 by the automatic take-out machine 10, for example. Has become. In the present embodiment, imaging is performed in a state where the object (molded product) is released from being held by the automatic unloader 10, so that an arbitrary surface of the molded product can be easily imaged, and the arrangement space of the imaging unit can be easily obtained. The degree of freedom is high. However, in the present embodiment, it is necessary to devise the positioning of the molded product and to use a sorting means 56 separate from the automatic unloader 10, so that the positioning accuracy (in other words, the dimensional accuracy) is relatively severe. Should be applied to articles that are not required.

[Effects of the Invention] As described above, according to the present invention, in addition to a plurality of operation condition monitoring items, the outer shape and appearance properties of the molded product (molded product outer shape and appearance information) closely related to the quality of the molded product. Is included in the monitor items for determining the quality of molded products during continuous automatic operation.
Good / bad judgment can be made with high accuracy in real time. Also,
Information on the external shape and appearance of the molded product is grasped as characteristic quantities such as length, area, direction, density, number, pattern, etc., and
This feature amount is recognized in association with each defective phenomenon (short shot, burr, sink mark, crack, whitening, burn (black spot), peeling layer, etc.) of the molded product. The defect phenomenon can be quantitatively and accurately determined, and the quality determination accuracy of the molded product is further improved. Also,
Since the molded product is imaged by the imaging means in a state where the molded product is taken out of the machine body, the molded product detached from the mold can be imaged from an arbitrary surface to determine the outer shape and appearance properties. This makes it possible to improve the measurement (judgment) accuracy of the outer shape and appearance properties in this respect as well. In general, it is possible to provide an injection molding machine capable of automatically discriminating a proper non-defective product / defective product by including information on the outer shape and appearance of a molded product in a monitor item, and its industrial value is enormous.

Further, the result of the defect determination based on the outer shape and appearance properties of the molded product is reflected in the correction setting of the molding operation conditions, which greatly contributes to the improvement of the precision of the molded product.

[Brief description of the drawings]

1 to 3 relate to one embodiment of the present invention. FIG. 1 is an explanatory view showing a schematic configuration of a main part of an injection molding machine, and FIG. 2 is an image of a molded product held by an automatic removal machine. FIG. 3 is an explanatory view showing an example of a print output of measured values in a specific shot when a molded article inspection process is performed, and FIG. 4 is a view showing another embodiment of the present invention. FIG. 5 is a perspective view showing the arrangement of the image pickup means, and FIG. 5 is a perspective view showing the arrangement of the image pickup means according to still another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Base, 2 ... Fixed die plate, 3 ... Support board, 4 ... Tie bar, 5 ... Cylinder cylinder, 6 ... Toggle link mechanism, 7 ... Movable die plate, 8 ... Fixed side metal Mold, 9… Movable mold, 10… Automatic removal machine, 12…
... Heating cylinder, 13 ... Screw, 14 ... Nozzle, 15
... band heater, 16 ... hopper, 17 ... motor, 18
…… Injection cylinder, 20 …… Injection pressure detection sensor, 21 ……
Injection stroke detection sensor, 22 Screw rotation detection sensor, 23, 24 Temperature detection sensor, 25 Mold opening / closing stroke detection sensor, 26 Mold clamping pressure detection sensor, 27
Operation detection sensor for automatic take-out machine, 30 microcomputer, 31
…… Molding condition setting storage unit, 32 …… Molding process control unit
33 arithmetic control unit, 34 actual measured value storage unit, 35 upper / lower limit setting storage unit, 36 comparison operation determination unit, 41 driver group, 42, 43 control valve, 50: Molded product, 51: Video camera, 52: Background plate, 53: Light source, 54: Belt conveyor, 55: Defective product storage, 56: Sorting means, 60:
... Image processing / storage unit, 61 ... Image recognition unit, 62 ... Image display processing unit, 63 ... Display switching unit, 70 ... Key input means, 71
...... Display device, 72 ... Printer, 73 ... External memory.

Continuation of the front page (56) References JP-A-62-279918 (JP, A) JP-A-63-4925 (JP, A) JP-A-60-220180 (JP, A) JP-A-63-128920 (JP, A) , A) Shokai Sho 63-66216 (JP, U) Nissei Plastics Injection Research Group "I want to know injection molding" (Apr. 30, 1986) Japan Machinist Co., Ltd.

Claims (2)

(57) [Claims] 1. A microcomputer for driving and controlling each part of a molding machine based on set molding operation condition values and measurement information from each sensor. In order to determine the quality, in an injection molding machine having a function of comparing the upper limit value and the lower limit value of a plurality of predetermined operating condition monitor items with the actually measured value, and determining the quality of the molded product based on the comparison result, Image pickup means for picking up a molded product taken out for each shot is provided, and image data sent from the image pickup means is converted to extract characteristic quantities such as length, area, direction, density, number, and pattern. Image recognizing means for performing image recognizing in the microcomputer or separately from the microcomputer, and outside the molded article based on the feature amount extracted by the image recognizing means. The microcomputer recognizes the shape / appearance information in association with the shot together with the actually measured values of the other operation condition monitor items, and obtains the short shot, burr, Judgment is made in accordance with individual failure phenomena such as sink marks, cracks, whitening, burns (black spots), and peeling layers, and the external shape and appearance information of the molded product is used in addition to the actually measured values of the operation condition monitor items. The quality of the molded product is determined, and the molded product is imaged by the imaging means. The molded product is carried out of the machine body by a take-out machine that takes out the molded product from the mold when the mold is opened, and the molded product is taken out by the take-out machine. It is characterized in that the molding is carried out in a held state or in a state where the molded product taken out of the mold when the mold is opened is transported outside the machine main body and placed at a predetermined position. Injection molding machine. 2. An injection molding machine according to claim 1, wherein said molded product external appearance / appearance information indicating occurrence of defective products is reflected in correction setting of molding operation conditions.