KR960011543B1 - Working device for high precision blanking and method therefor - Google Patents

Abstract

The device processes complex shape blanks at one stroke precisely. The device includes: a plurality of punches confronted with blanking patterns; a punch plate for installing the punches; punch guides for guiding up and down movement of the punches; a hard plate 10 cated on the top of the punch plate; a hydraulic cylinder for driving the punch guides downwardly more than the punches; a ram for driving an upper press up and down; and a die having a plurality of holes.

Description

High precision blanking machine and method

1A to 1K are process drawings showing a conventional rotor clutch manufacturing process.

2 is a cross-sectional view showing a high-precision blanking apparatus according to the present invention, the left part is when the ram is at the top dead center, the right part is when the ram is at the bottom dead center.

3 is a schematic cross-sectional view of a reciprocating hydraulic pressure supply device according to the present invention.

4 is a bottom view of the punch.

* Explanation of symbols for main parts of the drawings

4: Workpiece 9: Rotor Clutch

23: upper knockout plate 231: upper knockout pin

233: upper knockout 27A, 27B, 27C: punch

26: punch plate 28: punch guide

24: upper hard plate 35: cylinder

25: ram 33: piston

36: through hole 38: die

43A-43C: Lower knockout pin 50: Lower knockout plate

52: lower knockout 51: elastic spring

54: main knockout pin

The present invention relates to a high precision blanking processing apparatus and a method thereof, and more particularly, to a high precision blanking processing apparatus and a method which can process a multi-stage blanking process of a complicated shape by one operation by hydraulic double acting cold closed forging.

Products to which the processing method of the present invention can be applied include, for example, a rotor clutch for an air conditioner of an automobile.

The rotor clutch 9 used to electronically control the air conditioner of such a vehicle is shown in FIG.

In order to manufacture the rotor clutch 9, a multi-step drawing, piercing and blanking process as shown in FIGS.

That is, first of all, the quadrangular plate 2 shown in FIG. 1a is blanked in a circle to form a circular plate 3 as shown in FIG. 1b, and then the fourth drawing, internal piercing, internal burring and Through internal upsetting (first c to i), a cylindrical intermediate product 4 with a flange 8 on top and a tuck formed therein is obtained.

Thereafter, primary blanking (FIG. 1j) for forming twelve protrusions 5 on the outermost side of the flange 8 and through holes 6 and 7 concentrically arranged in two rows of six inside thereof. The secondary blanking process (FIG. 1k) to form a.

In particular, such a conventional machining method uses a spring-like one-ton press for the final primary and secondary blanking, so that a complicated shape product must be subjected to multi-stage blanking.

Therefore, the above-described prior art has a problem of decrease in productivity and cost increase due to the multi-stage processing process.

In addition, in the related art, as the type and size of the workpiece is changed, there is an inconvenience in that the thickness and length of the spring coil must be newly adjusted. It was difficult to apply to the blanking die of a complicated shape like a rotor clutch.

Furthermore, the conventional blanking mold has a problem in that the punch pins can be easily broken because a plurality of punch pins are fixed to the punch plate without the punch guide, and when the punch pins are broken, the entire mold must be replaced.

It is therefore an object of the present invention to provide a high precision blanking processing apparatus and method for processing a multi-stage blanking process of complex shape by one operation by hydraulic double acting cold sealing forging.

In order to achieve the above object, the present invention provides a plurality of punches disposed corresponding to the blanking pattern of the workpiece, a punch plate to which the punch is detachably fixed to the lower portion, and a guide passage for vertical movement of the punch. A punch guide, an upper hard plate disposed above the punch plate, and a piston disposed outside the punch guide upper part and the upper hard plate and built therein according to the supply hydraulic pressure to drive the punch guide relatively downward than the punch. And a die disposed above the upper hard plate and the cylinder to drive the upper press up and down, and a die disposed to face the punch guide and having a plurality of through holes corresponding to the plurality of punches. When the ram is lowered, the punch guide is blank of the workpiece It is composed of a high-precision blanking processing apparatus, characterized in that descending before the punch to squeeze and fix the king processing portion to the die.

In addition, according to the present invention, in the high precision blanking processing method, a plurality of punches corresponding to the blanking pattern of the workpiece is fixed to the lower portion of the punch plate to move up and down along the guide passage of the punch guide, and the punch guide is relatively to the punch. In the high precision blanking processing method of a blanking apparatus in which a hydraulic actuating piston is disposed above the punch guide so as to be driven downward, a ram is located at the top dead center, and the piston is placed on the piston so that the punch guide is located below the punch. Setting the workpiece to be blanked on the die while applying hydraulic pressure, the ram is lowered, and the punch guide press-fixes the workpiece to be blanked of the workpiece on the die; As the ram descends, the punch blanks the workpiece. It consists of the steps:

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

2 is a cross-sectional view of a manufacturing apparatus for explaining a flange portion processing method of, for example, a rotor clutch by a hydraulic double acting cold forging method according to an embodiment of the present invention, the left part is a ram boss When located at the point, the right part shows when the ram is located at the bottom dead center, that is, when the blanking is performed.

The manufacturing apparatus of the present invention is composed of a hydraulic double acting cold forging device (hereinafter referred to as a hydraulic press), the structure thereof is as follows.

Intermediate product in which the blanking of the flange portion 8 is required at the top of the product guide pin 19 located at the center of the die 38 of the hydraulic press to obtain a completed rotor clutch 9 as shown in FIG. That is, the product guide 22 corresponding to the inner diameter of the to-be-processed object 4 is formed.

An upper knock-out pin 231 penetrates the center portion of the ram 25 located above the product guide 22. In addition, an upper knockout 233 whose lift is limited by the upper knockout pin 231 and an upper knockout plate 23 fixed to the front end thereof are installed at a lower portion thereof to complete the processing of the workpiece 4, and then press When the ram 25 is raised, the processed rotor clutch 9 comes with the rotor clutch 9 to be separated.

In addition, an upper hard plate 24 is disposed below the ram 25, and the upper knockout 233 is coupled to a through hole in the center thereof, and a punch plate 26 is disposed below the ram 25. It is.

A plurality of punches 27A, 27B, and 27C required for blanking the workpiece 4 are detachably fixed to three rows in the lower portion of the punch plate 26 as shown in FIG. 4 according to the blanking pattern. In the periphery of these punches, punch guides 28 are disposed to prevent the punches from moving left and right during vertical movement of the punches 27A, 27B, and 27C and to serve as guide passages for vertical movement.

On the other hand, the punch guide holder 29 for holding the punch guide 28 is disposed outside the punch guide 28, the upper outer portion of the punch guide 28 and the upper portion of the guide holder 29 will be described later. Cylinder block 32 to move up and down about the upper hard plate 24 by the hydraulic pressure applied through the hydraulic passage 31 from the reciprocating hydraulic pressure supply device 30 as shown in FIG. The lower part 331 of the piston 33 arrange | positioned at the inner cylinder 35 is in contact.

At this time, the inner lower portion 333 of the piston 33 is punch plate 26 by the hydraulic pressure applied to the upper portion of the piston 33 when the ram 25 is in the top dead center as shown in the left part of FIG. The space S1 is formed on the upper part of the cylinder 35 by keeping in contact with the upper surface of the upper side of the cylinder. When the ram 25 is at the bottom dead center as in the right part of FIG. Since the hydraulic pressure is removed, the piston 33 is moved above the cylinder 35 to form a space S2 between the inner lower portion 333 of the piston 33 and the upper portion of the punch plate 26.

On the other hand, a cylinder fixing nut 34 is fastened to a lower outer circumferential portion of the cylinder block 32, and a protrusion 341 is formed at an inner lower portion of the cylinder fixing nut 34 so that the punch guide holder 29 is formed by a piston ( When descending together with the lowering of 33, the protrusion 291 is formed in the outer upper portion of the punch guide holder 29.

On the other hand, the die 38 corresponding to the punch guide 28, the punch guide holder 29, and the cylinder fixing nut 34, the die holder 39, and the die fixing nut 40 are concentrically located at the bottom of the press. It is arranged in sequential outer shell.

At this time, the product guide pin 19 is fixed to the center portion at the center portion 38, and a plurality of through holes 36 corresponding to the plurality of punches 27A, 27B, and 27C are formed up and down at the outer portion thereof. 36, a plurality of lower knockout pins 43A, 43B and 43C are inserted into the scraps 41 to remove scraps 41 generated by blanking the workpiece 4, respectively. In addition, a lower knockout plate 50 is positioned below the lower knockout pins 43A-43C, and a lower knockout 52 in which the elastic spring 51 is extrapolated is provided at the center lower portion of the knockout plate 50 to form the base of the press. 55).

In addition, the knockout plate guide block 53 and the guide block holder 45 which support them from the lower side on the outer side of the knockout plate 50 and the lower side of the die 38 and the die holder 39 are provided with a die fixing nut 40 and The holder clamp 46 is fixed to the base 55 of the press. In addition, the main knockout pin 54 is disposed in the lower base 55 of the lower knockout 52 to be movable.

The hydraulic press of the present invention configured as described above has a plurality of punches (27A, 27B, 27C) arranged in three rows fixed to the lower portion of the punch plate 26, and the forming of the flange portion of the rotor clutch is completed by one blanking process. This will be described according to the process steps with reference to FIGS. 2 and 3 as follows.

First, when the ram 25 is located at the top dead center as in the left part of FIG. 2, the hydraulic pressure is supplied to the upper portion of the piston 33 in the cylinder 35 through the hydraulic passage 31 from the hydraulic supply device 30 shown in FIG. 3. In this state, the piston 33 is lowered to the lower part of the cylinder 35.

As a result, the punch guide 28 and the punch guide holder 29 positioned at the lower part of the piston 33 are also lowered. Therefore, the lower part of the punches 27A, 27B, and 27C are lowered according to the lowering of the piston 33. It remains the same as or above the bottom of 28).

In this state, the workpiece 4 is set on the product guide 32, and then the ram 25 of the upper press is lowered. The punch guide 28 first contacts the flange 8 of the workpiece 4, The flange part 8 is fixed with the die 38 located at the bottom. In this case, the ram 25 is located at about 150 ° instead of the bottom dead center.

Subsequently, the lowering force of the ram 25 is greater than the hydraulic pressure applied to the piston 33, so that fluid such as oil on the piston 33 is returned to the reciprocating hydraulic pressure supply device 30 shown in FIG. As the ram 25 descends, the piston block 32 and the punch plate 26 are also lowered. When the ram 25 reaches the bottom dead center as shown in FIG. 2, the punches 27A, 27B, and 27C are punch guides ( It protrudes from 28 and punches the flange 8 of the workpiece 4.

At this time, the knockout pins 43A, 43B, 43C and the lower knockout plate 50 are in a state of being lowered by compressing the spring 51 by the punched scrap 41.

Then, when the ram 25 rises toward the top dead center again, the scrap 41 inserted into the through hole 36 of the die 38 is subjected to the rising force of the main knockout pin 54 and the restoring force of the compression spring 51. The lower knockout plate 50 is raised to be removed by the knockout pins 43A, 43B and 43C. In addition, the blanking rotor clutch 9 which rises with the upper press is also separated by the upper knockout pin 233 on which the upper knockout plate 23 is mounted, thereby being hit by the upper knockout pin 231.

As described above, according to the present invention, since the punching guide and the die are pressed and fixed by the precisely controlled hydraulic pressure applied from the reciprocating hydraulic pressure supply device, the flange portion of the rotor clutch can be precisely manufactured.

This hydraulic pressure supply device 30 has a configuration as shown in FIG.

Referring to FIG. 3, the reciprocating hydraulic pressure supply device includes an air auxiliary tank 52 for receiving and storing compressed air from the compressor 51, and the air auxiliary tank 52 has an air cylinder through the regulator 53. It is connected to one side of 54.

On the other hand, the shaft 56 of the air piston 55 inserted into the air cylinder 54 extends to the other side of the air cylinder 54 and the shaft 58 of the oil piston 59 inserted into the hydraulic cylinder 60. And by a clamp 57. In addition, the other side of the hydraulic cylinder 60 is connected to the hydraulic tank 62 via a check valve 61 while a supply pipe 63 for supplying hydraulic pressure from the hydraulic cylinder 60 to the cylinder 35 of the upper press is provided. It is connected.

Therefore, when the ram 25 of the hydraulic press is at the top dead center, the oil piston 59 pressurizes the oil in the hydraulic cylinder 60 by the operation of the compressor 51 and the air piston 54, and thus the cylinder in the hydraulic press. As a result of supplying the pressurized oil to the upper part, the piston 33 is lowered to the lower part of the cylinder 35 as shown in the left part of FIG.

After this, the upper press is lowered and the lowering force of the upper press is applied to the cylinder 35 from the time when the punch guide 28 and the die 38 press the flange 8 as shown in the right part of FIG. Since the oil is relatively much larger than the hydraulic pressure supplied, oil is fed back from the cylinder 35 to the hydraulic cylinder 60 of the hydraulic supply device 30 until the ram 25 reaches the bottom dead center.

As described above, according to the present invention, the punch guide is pressed against the workpiece by the relative advance driving of the punch guide, so that the blanking process is performed. Machining of the process can be performed in one operation, and moreover, in the prior art, when one of the punch pins is broken, the mold itself is replaced, but in the present invention, the repair can be made by replacing only the broken punch among the detachably fixed punches.

Furthermore, since the punch guide guides a plurality of punches that move up and down, the breakage of the punch can be greatly reduced.

Claims (11)

A plurality of punches disposed corresponding to the blanking paddles of the workpiece, a punch plate to which the punch is detachably fixed to the lower portion, a punch guide forming a guide passage for vertical movement of the punch, and an upper portion of the punch plate. An upper hard plate disposed and a cylinder disposed outside the upper and upper hard plates so that a piston embedded therein drives the punch guide relatively downward than the punch, and the upper hard plate And a die disposed above the plate and the cylinder to drive the upper press up and down, and a die disposed to face the punch guide and having a plurality of through holes corresponding to the plurality of punches. Even if the punch guide presses and fixes the blanking part of the workpiece to the die, High precision blanking processing apparatus characterized in that the first lower than the punch. The piston of claim 1, wherein the piston is positioned by the supply hydraulic pressure such that the punch guide is located below the punch from the time when the ram is located at the top dead center until the punch guide starts to press the processing part of the workpiece. High-precision blanking apparatus, characterized in that to maintain the lowered state. The high precision blanking apparatus according to claim 1, wherein the piston rises to the upper portion of the cylinder as the ram advances to the bottom dead center after the punch guide presses the workpiece of the workpiece. The high precision blanking apparatus according to any one of claims 1 to 3, further comprising reciprocating hydraulic pressure supply means for applying a predetermined hydraulic pressure to the cylinder. 2. The apparatus of claim 1, further comprising: a plurality of lower knockout pins inserted into the through holes formed in the die, a lower knockout plate disposed under the die, a knockout plate guide block serving as a vertical movement guide of the knockout plate, And a scrap removing means comprising a lower knockout having an elastic member coupled to an outer circumferential surface of the lower knockout plate, and a main knockout pin installed on the lower knockout lower portion so as to be driven up and down. The apparatus of claim 1, wherein the punch is disposed on a plurality of concentric circles. The high precision blanking apparatus according to claim 1, wherein the workpiece is an intermediate product for blanking a flange portion of an air conditioner rotor clutch. A plurality of punches corresponding to the blanking pattern of the workpiece is fixed to the lower part of the punch plate to move up and down along the guide path of the punch guide, and the hydraulically operated piston is driven downward to relatively drive the punch guide relative to the punch. In the high-precision blanking method of the blanking apparatus disposed above, blanking is applied to the die while a predetermined hydraulic pressure is applied to the piston so that the ram is located at the top dead center and the punch guide is positioned relatively downward to the punch. Setting the workpiece to be processed, the ram is lowered, and the punch guide is press-fixed to the die to be blanked of the workpiece, and the punch is continued as the ram is lowered in the crimp fixed state. High precision blank, characterized in that it comprises a step of blanking the workpiece Ranking processing equipment. 10. The high precision blanking according to claim 8, wherein when the ram is lowered for the blanking process, the lowering force of the ram is relatively greater than the hydraulic force applied to the piston, in which case the piston is moved to the upper portion of the cylinder. Processing method. 10. The method of claim 9, wherein the hydraulic pressure applied to the piston inside the cylinder is applied from a reciprocating hydraulic pressure supply device. The high-precision blanking method according to claim 8, wherein the workpiece is an intermediate product for blanking a flange portion of an air conditioner rotor clutch.