KR100465509B1 - Impeller type of shot peening equipment having air conditioner - Google Patents

Abstract

The present invention relates to an impeller-type short peening facility that strikes an outer surface of a workpiece to reinforce the physical properties of the workpiece. The present invention relates to an air compressor 1210 for forming high-pressure compressed air, and an air pressure supplied from the air compressor 1210. The pressure adjusting mechanism 1220 for adjusting the pressure, the air supply control valve 1230 for selectively blocking the air supply from the pressure regulator 1220, and the high-pressure air from the air supply control valve 1230 to the workpiece ( 20 is a structure in which a cooling device 1200 for cooling the surface portion of the workpiece 20, which is heated by the impact of the steel balls S, formed of air nozzles N1 and N2 sprayed onto the surface of the workpiece 20, is reinforced. In this way, since the temperature rise of the workpiece surface is prevented by the air-cooled cooling device during the shot peening process of the workpiece, the reduction of the compressive residual stress due to the temperature rise of the workpiece surface is prevented, The physical properties are improved.

Description

Impeller type of shot peening equipment with cooling device {Impeller type of shot peening equipment having air conditioner}

The present invention relates to a short peening facility for hitting the outer surface of the workpiece to reinforce the physical properties of the workpiece, in particular in the impeller type short peening facility to cool the surface of the workpiece during the short peening operation to prevent the temperature rise It relates to a short peening equipment of the impeller type with a cooling device.

As is well known, the shot peening equipment strikes the outer surface of the workpiece through steel balls so that the compressive stress remains on the outer surface of the workpiece. When the compressive stress remains, the strength of the workpiece increases, and The elongation due to is increased, and fatigue cracking is suppressed as much as possible.

The shot peening facility is classified into an impeller method and an air nozzle method according to which device the steel ball is launched.

Referring to Figures 1a and 1b the operating state of the conventional impeller type shot peening facility as follows.

First, in a state in which the door 420 of the cabinet 400 is opened by the door opening / closing mechanism 430, the jig 10 into which the workpieces 20 are fitted is rotated by the transfer device 1100 to the rotary table () of the cabinet 400. When seated on the 410, the door 420 is closed by the door opening and closing mechanism 430. In this case, the transfer device 1100 is typically used a robot arm that can be moved by holding the jig 10 or the workpiece 20, and will be described below in unified operation to transfer the jig (10). Subsequently, the driving mechanism 910 of the workpiece fixing device 900 is operated to press the workpiece 20 fixed to the workpiece 20 which is inserted into the jig 10 and fixed to the downward direction, and the swivel driving mechanism 500. Is operated so that the swivel 410 and the jig 10 and the workpiece 20 fixed and mounted on it is rotated by the swivel drive mechanism (500). In this case, the driving mechanism 910 may be any one of the known ones capable of reciprocating the pressing member 920 in the vertical direction, but an air cylinder is mainly used, and the pressing member 920 is the driving mechanism 910. It is rotatably connected to the drive shaft of. In this state, when the steel ball injection valve 210 is opened, the steel balls (S) temporarily stored in the steel ball storage chamber 110 through the steel ball injection line (L2) to the center of the impeller 312 of the impeller device 310 It is put into. Since the impeller 312 is rotated by being connected to the drive shaft 311a of the driving motor 311, the steel ball S introduced into the impeller 312 is moved outward in a state where it is mounted on the rotary wing of the impeller 312. Then fires toward the workpiece 20 at any position. The firing position of the steel ball S is changed according to the rotational speed of the impeller 312 and the feeding position and the throwing angle of the steel ball S introduced into the center of the impeller 312. Here, reference numeral 1000 denotes a device for changing the position of the steel ball input line, and the device for changing the input position and the input angle of the steel ball (S). The steel ball S fired from the impeller 312 is then freely dropped after being hit by the outer surface of the workpiece 20 being rotated across the inner space of the cabinet 400 and introduced into the steel ball recovery device 600. The steel ball recovery device 600 is freely falling and all the well-known that can transfer the steel balls (S) discharged from the cabinet 400 to the return line (L1) is applicable, in the case of this embodiment screw conveyor 610 ) And bucket elevator 620 was used. As described above, the steel ball S introduced into the steel ball recovery device 600 is transferred to the return line L1 by the steel ball recovery device 600, and the steel ball S transferred to the return line L1 is then removed from the foreign matter. It is recovered to the steel ball storage chamber 110 through 700, and is recycled through the path. The debris removal unit 700 is to remove debris contained in the recovered steel balls (S), a debris removal device, such as drum type and strain mesh is used, the filtered debris to the outside through the debris discharge line (L3). Is released. Then, when the short pinning operation of the workpiece 20 is completed, the steel ball injection valve 210 is closed to block the supply of the steel ball (S) to the impeller 312, the swivel drive mechanism 500 is stopped operating the swivel ( The rotation of the 410 is stopped, and then the driving mechanism 910 of the workpiece fixing device 900 is operated to return the pressing member 920 to the initial position. At this time, the steel balls (S) launched into the cabinet 400 is recovered to the steel ball storage chamber 110 through the debris removal unit 700 after being transferred to the return line (L1) by the steel ball recovery device (600). Stored. When the rotation of the turntable 410 is stopped, the door 420 of the cabinet 400 is opened by the door opening / closing mechanism 430, and the jig 10 to which the workpieces 20 which are short-pinned are fixed is fixed. It is pulled out of the cabinet 400 by the transfer apparatus 1100. Subsequently, successive shot peening processes are performed by sequentially repeating the above operations, each of which is operation controlled by a separate control device (not shown). On the other hand, the cabinet 400 is provided with a dust collector 800, the dust inside the cabinet 400 is collected in the dust collector (800).

Such an impeller type short peening system uses the impeller device 310 as a ball ejecting means, so that the steel balls emitted from the impeller 312 are spread up, down, left and right, and thus can process several workpieces 20 at a time. There is an advantage.

However, according to the impeller-type shot peening facility, a loss steel ball that cannot hit the workpiece 20 is generated among the steel balls S fired from the impeller 312, so that the shot peening efficiency decreases. Since the steel balls S emitted from the impeller 312 spread unevenly up and down and left and right, the physical properties of the shot peening workpieces 20 are not uniform.

Moreover, the conventional impeller type short peening equipment is not capable of cooling the surface portion of the workpiece 20 which is elevated in temperature during the shot peening operation, so that the physical properties of the workpiece 20 can be satisfactorily obtained. There was a problem that prevented.

This will be described in more detail with reference to FIGS. 3A and 3B. First, as shown in FIG. 3A, the steel balls S hit the surface of the workpiece 20 during the short peening operation. The temperature of the surface portion of the workpiece 20 rises, and a temperature difference is generated between the inside of the workpiece 20 and the surface portion. As such, when the temperature difference is generated, the surface portion having a relatively high temperature is expanded, so that a tensile stress is generated relatively in the inner side in contact with the surface portion, and a compressive stress is generated in the surface portion. If the steel balls (S) continuously hit the surface of the workpiece 20 in this state, while the surface portion of the workpiece 20 is compressed, the compressive stress remains in the surface portion, but the surface portion of the workpiece 20 Since the compressive stress due to the state is generated, the residual amount of compressive stress due to the impact of the steel ball (S) accommodated in the surface portion of the workpiece 20 is reduced. Therefore, as shown in FIG. 3B, when the surface portion of the workpiece 20 which has risen in temperature after completion of the short peening treatment is cooled, the surface portion of the workpiece 20 is contracted, so that the overall compression of the surface of the workpiece 20 is performed. The stress is reduced and a tensile stress corresponding to the compressive stress remaining in the surface portion of the workpiece 20 remains inside the workpiece 20 in contact with the surface portion. Referring to Fig. 4, in the case of the workpiece 20 processed by the shot peening apparatus of the impeller method, due to the temperature rise of the surface portion of the workpiece 20 due to the impact of the steel ball S, It can be seen that the reduction of the compressive residual stress at the surface portion occurs largely. On the other hand, Figure 5 compares the physical properties of the non-short pinned article, the workpiece to be shot peened by the impeller type shot peening equipment, and the workpiece to be shot peened by the air nozzle type shot peening equipment. Referring to this, it can be seen that as the compression residual stress increases, the elongation increases. The workpiece that has been shot peening by the shot peening apparatus of the impeller method is the workpiece that has been shot peening by the shot peening equipment of the air nozzle method. It can be seen that the effective tensile stress is smaller.

On the other hand, the conventional short pinning equipment of the air nozzle type, as shown in Figure 2, using the air nozzle device 320 as a steel ball emitting means, the operation thereof will be described as follows.

First, the jig 10 into which the workpiece 20 is fitted is seated on the rotary table 410, and the workpiece S is pressed downward by the pressing member 920, and then the rotary table is driven by the rotary table driving mechanism 500. When the air supply control valve 323 and the steel ball injection valve 210 are opened in the state in which the 410 is rotated, the steel balls S temporarily stored in the steel ball storage chamber 110 are provided through the steel ball injection line L2. After flowing into the air injection line L5, the air is rapidly moved along the air injection line L5 by the high pressure air, and is fired toward the workpiece 20 through the air nozzle N1. At this time, since the high-pressure air may be introduced into the return line L1 through the steel ball input line L2, the pressure shutoff valve 250 is blocked at the same time as the steel ball input valve 210 is opened. The steel balls S fired from the impeller 312 are dropped into the steel ball recovery device 600 after falling freely after hitting the outer surface of the workpiece 20, and thus the steel balls S injected into the steel ball recovery device 600. ) Is transferred to the return line (L1) by the steel ball recovery device 600 when the workpiece 20 is replaced, and is recovered to the steel ball storage chamber 110 through the foreign matter removing unit 700. Subsequently, when the shot pinning operation of the workpiece 20 is completed, the steel ball injection valve 210 and the air supply control valve 323 are closed, and the shot of the steel ball S from the air nozzle N1 is stopped. Replacement of the pinned workpiece (including jig) and the workpiece to be shot peened (including jig) is performed. Subsequently, successive shot peening processes are performed by sequentially repeating the above operations, each of which is operation controlled by a separate control device (not shown).

In such an air nozzle type short peening system, the air nozzle device 320 is used as a steel ball emitting means, and the steel ball S emitted from the air nozzle N1 strikes the surface of the workpiece 20. Since the surface portion of the workpiece 20 is cooled by the high-pressure air injected from N1, the temperature rise of the surface portion due to the striking of the steel ball S is prevented, and thus the compressive residual stress of the surface portion of the workpiece 20 is thereby caused. The advantage is that the reduction is prevented. Referring to Fig. 4, in the case of a workpiece that has been shot peening by an air nozzle type shot peening apparatus, the compressive residual stress at the extreme surface portion is short compared to a workpiece that has been shot peened by an impeller type shot peening apparatus. It can be seen that the reduction occurs small, due to the fact that the temperature rise of the surface of the workpiece 20 is prevented by the high pressure air injected from the air nozzle N1. Therefore, as shown in FIG. 5, the workpiece to be shot peened by the shot peening apparatus of the air nozzle type is larger than the workpiece to be shot peened by the shot peening apparatus of the impeller type.

However, in the case of the short pinning equipment of the air nozzle type, the steel balls S fired through the air nozzles N1 are fired almost in a straight line. In order to form pressure for firing the steel balls S, the air nozzles Since the size of N1) must be limited, only a small number of workpieces 20 can be processed per process, so that a large amount of work time is required to process a large amount of workpieces 20. Because of this, its use is very limited.

Accordingly, the present invention has been invented to solve the above problems, and the shot peening of the impeller method having a cooling device capable of simultaneously short peening a large amount of the workpieces while preventing the temperature rise of the workpiece surface during shot peening treatment The purpose is to provide the equipment.

Figure 1a is a block diagram showing a short peening facility of the impeller method according to the prior art,

FIG. 1B is a planar layout view showing the main portion of FIG. 1A in an enlarged manner; FIG.

Figure 2 is a block diagram showing a short pinning equipment of the air nozzle method according to the prior art,

3a and 3b is a view for explaining the change in the internal stress of the workpiece by the conventional shot peening facility of the impeller method,

Figure 4 is a graph showing the internal stress of the workpiece treated by the conventional shot peening equipment of the impeller type shot peening equipment and air nozzle type,

FIG. 5 is a graph illustrating comparison between physical properties of untreated workpieces and workpieces treated by a conventional short peening apparatus of an impeller and a shot peening apparatus of an air nozzle type. FIG.

Figure 6a is a block diagram showing a short peening equipment of the impeller method according to the present invention,

6B is an enlarged plan view of the main portion of FIG. 6A;

7A is a view showing another example of the present invention;

FIG. 7B is a view showing a modification of the shot peening equipment shown in FIG. 7A;

8A is a view showing another example of the present invention;

8B is an enlarged plan view of the main portion of FIG. 8A.

-Explanation of terms for the main parts of the accompanying drawings-

10,10 '; Jig, 20,20 '; Workpiece,

110,120; Steel ball storage chamber, 210,220; Steel ball injection valve,

250; Pressure shut-off valve, 310; Impeller device,

311; Drive motor, 311a; driving axle,

312; Impeller, 320; Air nozzle unit,

321; Air compressor, 322; Pressure regulator,

323; Air supply control valve, 400; Cabinet,

410; Swivel, 420; door,

430; Door opening and closing mechanism, 500; Swivel drive mechanism,

510; Drive motors 521,522; Power transmission member,

600; Steel ball recovery system, 610; Screw Conveyor,

620; Bucket elevator, 700; Debris removal unit,

800; Dust collector, 900; Workpiece Fixture,

910; Drive mechanism, 920; Pressing member,

1000; Steel ball input line position changing device, 1100; Conveyor,

1200; Chiller, 1210; Air compressor,

1220; Pressure regulating mechanism, 1230; Air supply control valve,

1300; Preheat chamber, 1310; door,

1320; Door opening and closing mechanism, 1400; Burner,

L1; Return line, L2, L7; Steel Ball Feeding Line,

L3; Foreign substance discharge line, L4; Air exhaust line,

L5, L6; Air spray line, N1, N2; Air Nozzle,

S; Steel balls.

The present invention for achieving the above object, the steel ball fired from the impeller rotated at high speed hits the surface of the workpiece to be rotated, so that the compressive stress is left in the surface portion of the workpiece, An impeller-type short peening apparatus having a cooling device for cooling a surface portion of a workpiece to be raised by temperature, the cooling device includes an air compressor for forming compressed air of high pressure, and an air pressure supplied from the air compressor. A pressure regulator, an air supply control valve for selectively blocking the air supply from the pressure regulator, and an air nozzle for injecting high-pressure air from the air supply control valve to the surface of the workpiece. The steel ball injection line communicates with the air injection line connecting the control valve, and the steel ball injection line connects the foreign substance removal unit. A steel ball storage chamber for temporarily storing the steel balls recovered from the steel ball, a steel ball inlet valve for selectively blocking the steel ball input from the steel ball storage chamber to the steel ball inlet line, and a pressure shut-off valve for blocking the inflow of high pressure air into the steel ball inlet line. It is a structure characterized by being installed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

6A and 6B show an impeller type shot peening apparatus according to the present invention, and the description thereof will be omitted while attaching the same reference numerals to the same portions as in FIGS. 1A and 1B according to the prior art.

According to the present invention, there is provided an air-cooled cooling device (1200) for cooling the surface portion of the workpiece 20, the temperature rise due to the strike by the steel ball (S), during the shot peening process the surface portion of the workpiece 20 Temperature rise is prevented.

The cooling device 1200 includes an air compressor 1210 for forming compressed air of high pressure, a pressure regulator 1220 for adjusting the air pressure supplied from the air compressor 1210, and air from the pressure regulator 1220. An air supply control valve 1230 for selectively interrupting supply and an air nozzle N1 (N2) for injecting high pressure air from the air supply control valve 1230 to the surface of the workpiece 20.

Referring to the operation state of the shot peening apparatus according to the present invention.

The jig 10 into which the workpiece 20 is fitted is seated on the rotary table 410, and the workpiece S is pressed downward by the pressing member 920, and then the rotary table 410 is rotated by the rotary drive unit 500. When the steel ball injection valve 210 is opened while the steel ball is opened, steel balls S injected through the steel ball injection line L2 are fired toward the workpiece 20 by the impeller 312 rotating at a high speed. At the same time, after the air supply control valve 1230 is opened to induce high pressure air from the air compressor 1210 along the air injection line L6, the air supply control valve 1230 is sprayed toward the workpiece 20 through the air nozzle N2. do. The air nozzle N2 may be used in various forms, but as shown in FIG. 6A, it is preferable to use a nozzle extended in the vertical direction in consideration of the arrangement of the workpieces 20. Then, when the short pinning operation of the workpiece 20 is completed, the steel ball injection valve 210 is closed to block the supply of the steel ball (S) to the impeller 312, the air supply control valve 1230 is closed to the workpiece The high pressure air spray to 20 is cut off. The operation of the shot peening device according to the present invention is operation controlled by a separate control device (not shown).

According to the present invention, since the temperature rise of the surface of the workpiece 20 is prevented by the pneumatic cooling device 1200, the decrease in the compression residual stress due to the temperature rise of the workpiece surface is prevented.

On the other hand, as shown in Figure 6b, the air nozzle (N1; N2) are respectively installed on both sides around the impeller 312, the high-pressure air injected through the air nozzle (N1; N2) to the workpiece ( 20, the steel balls S injected from the impeller 312 do not spread to the left and right directions by the air injected toward the workpiece 20, and thus all steel balls injected from the impeller 312. S) is guided to the workpiece 20 to hit it, there is an advantage that the short peening work efficiency is improved.

7A and 7B illustrate another embodiment of the present invention, and as shown therein, a steel ball injection into an air injection line L6 connecting the air nozzles N1 and N2 to the air supply control valve 1230. A steel ball storage chamber 120 communicating with the line L7 and temporarily storing the steel ball S recovered from the foreign matter removing unit 700 and a steel ball from the steel ball storage chamber 120 to the steel ball injection line L7 ( S) When the steel ball input valve 220 for selectively blocking the input and the pressure shut-off valve 250 for blocking the high-pressure air inflow into the steel ball input line (L7) is installed in the steel ball input line (L7), the cooling device There is an advantage that the 1200 can be used as an air nozzle apparatus 320 (see FIG. 2) in an air nozzle type short peening facility.

The operation of this is described as follows.

In the usual case, as shown in FIG. 7A, the steel ball injection valve 220 to the air injection line L6 is closed, and the steel ball injection valve 210 to the impeller 312 is opened, so that the steel ball S is opened. Fired by the impeller 312, the workpiece 20 is cooled by the high pressure air injected from the air nozzle (N2).

On the other hand, when the cooling device 1200 is used as an air nozzle device in an air nozzle type short peening system, as shown in FIG. 7B, the steel ball injection valve 210 to the impeller 312 is closed and the air injection is performed. The steel ball injection valve 220 to the line L6 is opened to allow the steel ball S to be fired through the air nozzle N1 after being introduced into the air spray line L6. In this case, since the firing speed of the steel ball S is greatly reduced when the air nozzle N2 having an enlarged length in the vertical direction is used, the general air nozzle N1 (reduced in diameter) is replaced and used. On the other hand, since the high-pressure air flows into the steel ball inlet line L7 when the steel ball inlet valve 220 is opened, the pressure shutoff valve 250 is closed in order to block it.

8A and 8B show yet another embodiment of the present invention, as shown therein, after preheating the workpiece 20 ′ in a preheat chamber 1300 with a heating device 1400. When shot peening while cooling the surface of the workpiece 20 through the cooling device 1200, a larger compressive stress remains on the surface of the workpiece 20, so that the physical properties of the workpiece 20 subjected to the sorting process This is greatly improved, after preheating the workpiece 20 to an appropriate temperature above room temperature. When the shot peening treatment is performed while cooling the surface portion of the workpiece 20, the opposite phenomenon of FIGS. 3A and 3B occurs, which is due to the fact that a significant compressive stress remains in the surface portion of the workpiece 20. . Here, reference numeral "1310" indicates a door opening and closing mechanism for opening and closing the door of the preheating chamber 1300, and "1320".

The present invention is not limited to the embodiments as described above, and of course, various modifications can be made without departing from the scope of the following claims.

According to the present invention as described above, since the temperature rise of the workpiece surface portion is prevented by the air-cooled cooling device during the shot peening treatment of the workpiece, the reduction of the compressive residual stress due to the temperature rise of the workpiece surface is prevented, There is an effect of improving the physical properties of the workpiece.

In addition, when the air nozzles of the cooling device are respectively installed on both sides of the impeller so that the high-pressure air injected through the air nozzles is injected toward the workpiece, the steel balls emitted from the impeller do not spread in the left and right directions. Since the workpiece is hit, the shot peening efficiency is improved.

In addition, when a preheating chamber having a heating device for preheating the workpiece is provided, and the workpiece is preheated to an appropriate temperature higher than the normal temperature before the shot peening treatment, the physical properties of the workpiece are further improved.

Claims (4)

The steel ball S fired from the impeller 312 rotated at a high speed strikes the surface of the workpiece 20 to be rotated, so that the compressive stress remains in the surface portion of the workpiece 20. In the impeller type short peening facility having a cooling device 1200 for cooling the surface portion of the workpiece 20, the temperature of which rises due to the impact caused by The cooling device 1200 includes an air compressor 1210 for forming compressed air of high pressure, a pressure regulator 1220 for adjusting the air pressure supplied from the air compressor 1210, and air from the pressure regulator 1220. Air supply control valve 1230 to selectively block the supply and the air nozzle (N1; N2) for injecting a high pressure air from the air supply control valve 1230 to the surface of the workpiece 20, The steel ball injection line L7 communicates with the air injection line L6 connecting the nozzles N1 and N2 to the air supply control valve 1230, and from the steel ball injection line L7 to the foreign matter removal unit 700. Steel ball storage chamber 120 for temporarily storing the recovered steel ball (S), Steel ball injection valve 220 to selectively block the steel ball (S) input from the steel ball storage chamber 120 to the steel ball injection line (L7) and , Pressure blocking valve 250 for blocking the inlet of high pressure air into the steel ball injection line (L7) is installed Shot peening equipment of the impeller system, characterized by. delete. According to claim 1, wherein the air nozzle (N1; N2) are respectively installed on both sides around the impeller 312, the high pressure air injected through the air nozzle (N1; N2) toward the workpiece 20 Short peening equipment of the impeller method, characterized in that the injection. The impeller type short peening system according to claim 1 or 3, further comprising a preheating chamber (1300) having a heating device (1400) for preheating the workpiece (20).