punching press

Abstract

The aim is to improve the processing accuracy of stamping compared to conventional stamping presses. In the stamping press (10) of this embodiment, for a single press head (20), three or more press head driving cams (42) are integrally rotatable on a common shaft (41) to press the press head (20) downward toward the lower dead center. The shaft (41) is supported at both ends by a pair of rotatable supports (31A) that engage with both ends of the multiple press head driving cams (42) sandwiched in the middle, and is also supported at the middle part of the press head driving cams (42) sandwiched between each other by a support groove (35M) that is open at the bottom. The multiple press head driving cams (42) include at least two lifting cams that apply downward and upward forces to the press head, and at least one lowering cam that applies only downward forces to the press head.

Description

Technical Field

[0001] This disclosure relates to a stamping machine. Background Technology

[0002] Conventionally, there are known presses that use cams to raise and lower the pressure head (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-120161 (paragraph

[0028] ) Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The aim is to improve the processing accuracy of stamping processes using the aforementioned conventional stamping presses.

[0008] Methods for solving problems

[0009] To address the aforementioned issues, this disclosure discloses a stamping press with a single press head, wherein three or more press head driving cams are integrally rotatable on a common shaft, pressing the press head toward the lower dead center. The shaft is rotatable at both ends by a pair of rotatable supports that engage with both ends of the plurality of press head driving cams, which are sandwiched in the middle. The shaft is also rotatable at the middle portion, which is sandwiched between the press head driving cams, by a support groove open at the bottom. The plurality of press head driving cams include at least two lifting cams that apply both downward and upward forces to the press head, and at least one lowering cam that applies only downward forces to the press head.

[0010] In another aspect of this disclosure, a stamping press for a single press head is provided with three or more press head drive cams rotatably mounted on a common shaft, pressing the press head toward the lower dead center. Below the press head are: multiple processing tables arranged axially along the shaft, simultaneously stamping multiple workpieces by the descent of the press head; and a conveying device that, each time the press head rises or falls, transports the multiple workpieces from the processing tables to one adjacent processing table. A workpiece generating mechanism is provided at the upstream end of one of the processing tables, which cuts blanks from a sheet metal and shapes the blanks into... A cylindrical workpiece is drawn or thinned on multiple processing tables downstream of the workpiece generating mechanism in the workpiece transport direction. Two pressure head driving cams are arranged on both sides of the workpiece generating mechanism in the upstream direction of the workpiece transport direction. The workpiece generating mechanism includes: a cylindrical first punch fixed to the pressure head to punch the blank from the metal sheet; a second punch fitted inside the first punch to form the blank into a cylindrical workpiece; and an auxiliary cam configured to rotate integrally on the shaft, causing the second punch to rise and fall at a different time than the rising and falling action of the pressure head. Attached Figure Description

[0011] Figure 1 This is a front view of the stamping machine according to the first embodiment.

[0012] Figure 2(A) is a conceptual diagram showing the state of the camshaft flexing due to its own weight, and Figure 2(B) is a conceptual diagram showing the state of the camshaft flexing due to the reaction force of the machining.

[0013] Figure 3 This is a front view of the stamping machine according to the second embodiment.

[0014] Figure 4 This is a front view of the stamping press according to the third embodiment.

[0015] Figures 5(A) and 5(B) are front views of the modified stamping press.

[0016] Explanation of reference numerals in the attached figures:

[0017] 10... Stamping machine;

[0018] 14...Transmission device;

[0019] 20... pressure head;

[0020] 31A... Rotary support part;

[0021] 35M... support groove;

[0022] 41... axis;

[0023] 42... Cam for driving the pressure head;

[0024] 45...Workpiece generation mechanism;

[0025] 46...First punch;

[0026] 47...Second punch;

[0027] 49…Auxiliary cam;

[0028] H1…Workpiece handling direction;

[0029] S…processing table. Detailed Implementation

[0030] [First Implementation Method]

[0031] Reference Figure 1 Figure 2 illustrates a stamping press 10 according to one embodiment of this disclosure. Figure 1 The image shows a front view of the stamping press 10 of this embodiment. This stamping press 10 is a so-called multi-station stamping press, in which multiple punches 12 are held in a horizontal row at the lower end of the press head 20, and multiple dies (not shown) corresponding to them are held in a horizontal row on the support beam 32. It also includes multiple processing tables S for processing workpieces using the punches 12 and dies. Furthermore, on the processing table S at the left end of the multiple processing tables S, a cylindrical workpiece is formed after a blank is punched from a metal sheet. To perform this secondary operation, a workpiece generating mechanism 45, which will be detailed later, is provided on the processing table S at the left end. Next, the cylindrical workpiece is sequentially transported to the downstream processing table S by the conveying device 14, where it is drawn or thinned to form a stamped product of a predetermined shape.

[0032] The following describes the drive mechanism of the pressure head 20. It should be noted that in the following description, [the following will be used to describe the mechanism]. Figure 1 The transverse direction of the stamping press 10 is called the "workpiece transport direction H1", which is the left side when viewing the stamping press 10 from the front. Figure 1 The left side is called the "upstream side of the workpiece transport direction H1", and the opposite side is called the "downstream side of the workpiece transport direction H1".

[0033] The pressure head 20 is supported on the support frame 11 in a height-adjustable manner. The support frame 11 has a pair of side support walls 31 that stand upright from the base portion 30 and are laterally opposed. A support beam 32 is provided between the lower ends of the pair of side support walls 31, and a top wall 33 is provided at the upper end. In addition, a pressure head support wall 34 is provided at approximately the upper part of the center of the pair of side support walls 31 in the vertical direction. The pressure head support wall 34 is provided at the rear end of the pair of side support walls 31 in the front-rear direction. Figure 1 The pressure head 20 is located on the inner side of the paper in the depth direction, and its upper end is connected to the top wall 33. Additionally, a plurality of guide rails (not shown) extending in the vertical direction are mounted on the front surface of the pressure head support wall 34. Furthermore, a sliding member fixed to the rear surface of the pressure head 20 engages with these guide rails, and the pressure head 20 is supported so that it can slide in the vertical direction.

[0034] A pair of rotating support portions 31A are provided at the upper end of a pair of side support walls 31. Furthermore, the two ends of the shaft 41 extending along the workpiece transport direction H1 are fitted with bearings or metal bearings provided in the pair of rotating support portions 31A and supported so as to be able to rotate.

[0035] Three or more pressure head driving cams 42 are fixed to the shaft 41 in a manner that allows them to rotate integrally. These pressure head driving cams 42 have a common cam curve. Specifically, the pressure head driving cams 42 are circular, and the center of the shaft 41 is located offset from the center of the circular shape of the pressure head driving cam 42. In this embodiment, the case with three pressure head driving cams 42 will be described as an example. Hereinafter, when distinguishing between the three pressure head driving cams 42, they will be referred to sequentially from the upstream side of the workpiece transport direction H1 as "first to third pressure head driving cams 42". Furthermore, the entire assembly of the shaft 41 and the multiple pressure head driving cams 42 is referred to as "camshaft 40".

[0036] The first pressure head driving cam 42 and the third pressure head driving cam 42 are configured close to a pair of rotary support portions 31A in the shaft 41. In contrast, the second pressure head driving cam 42 is configured close to the side of the first pressure head driving cam 42.

[0037] The first and second pressure head driving cams 42, located upstream of the workpiece transport direction H1, are thinner than the third pressure head driving cam 42 downstream. It should be noted that in this embodiment, the thickness of the first and second pressure head driving cams 42 is approximately 2 / 3 the thickness of the third pressure head driving cam 42, but this is not a limitation. Furthermore, the first and second pressure head driving cams 42 may be thinner than the third pressure head driving cam 42 on both sides; for example, only one of the first and second pressure head driving cams 42 may be thinner than the third pressure head driving cam 42 (see Figure 5(A)), all three pressure head driving cams 42 may have the same thickness (see Figure 5(B)), or they may be different thicknesses. It should be noted that in this disclosure, the center of the workpiece transport direction H1 (lateral) of the pressure head 20 is used as the dividing line. Figure 1 The left side of the center is called the "upstream side of the workpiece transport direction H1", and the side to the right of the center is called the "downstream side of the workpiece transport direction H1".

[0038] Multiple abutment portions 21, which abut against multiple pressure head drive cams 42, are rotatably supported on the pressure head 20. Specifically, a pair of abutment portions 21 are provided in the pressure head 20 at positions corresponding to the first and third pressure head drive cams 42, such that the first and third pressure head drive cams 42 are clamped in the vertical direction. In contrast, at the position corresponding to the second pressure head drive cam 42, an abutment portion 21 is provided only on the lower side of the second pressure head drive cam 42. That is, the first and third pressure head drive cams at both ends serve as lifting cams for pushing the pressure head 20 upward and pressing it downward, while the second pressure head drive cam 42 sandwiched between these lifting cams serves as a lowering cam for pressing the pressure head 20 downward only.

[0039] The abutment portion 21, for example, is a roller, protruding forward from the pressure head 20 and disposed between a pair of support protrusions (not shown) that are laterally opposed. A support shaft, mounted between the pair of support protrusions, passes through a bearing disposed at the center of the abutment portion 21. It should be noted that a metal bearing may be used instead of a bearing at the center of the pressure head 20. Furthermore, the abutment portion 21 is not limited to a roller; for example, it may be configured to have a protrusion protruding from the pressure head 20 and opposing the pressure head drive cam 42 from above or below, with an arc-shaped groove provided in the protrusion and the inner surface of the groove covered by a sliding metal member, and the pressure head drive cam 42 abutting against the sliding metal member.

[0040] As described above, the distance between the second pressure head driving cam 42 and the third pressure head driving cam 42 in the shaft 41 is wider than the distance between the first pressure head driving cam 42 and the second pressure head driving cam 42. A shaft support portion 35 is provided between the second pressure head driving cam 42 and the third pressure head driving cam 42. The shaft support portion 35 hangs down from the top wall 33 and has a support groove 35M on its lower surface. The support groove 35M is concave upwards, and its concave inner surface is covered by a sliding metal piece. Furthermore, the outer peripheral surface of the middle portion of the shaft 41 abuts against the inner surface of the support groove 35M, suppressing the upward bending deformation of the middle portion of the shaft 41. It should be noted that the support groove 35M in this embodiment is a groove with a semi-circular cross-section, but it can also be, for example, a V-shaped groove.

[0041] On the other hand, the aforementioned workpiece generating mechanism 45 is disposed between the first pressure head driving cam 42 and the second pressure head driving cam 42 in the shaft 41. Specifically, the workpiece generating mechanism 45 has a first punch 46 for cutting a cylindrical blank from a metal sheet, and a second punch 47 disposed inside the first punch 46 for forming the blank into a cylindrical workpiece. The first punch 46 moves up and down integrally with the pressure head 20, while the second punch 47 moves up and down with a different movement than the pressure head 20. An auxiliary cam 49 is provided between the first pressure head driving cam 42 and the second pressure head driving cam 42 for causing the second punch 47 to move up and down with a different movement than the pressure head 20.

[0042] The auxiliary cam 49 is supported by the shaft 41 and can rotate integrally, having a cam curve different from that of the pressure head drive cam 42. It should be noted that in this embodiment, the auxiliary cam 49 includes a lowering cam 49A for lowering the second punch 47 and a raising cam 49B for raising the second punch 47, but a single cam can also be used for both lowering and raising. Furthermore, in this embodiment, the lowering cam 49A and the raising cam 49B have different thicknesses (specifically, the lowering cam 49A is thicker than the raising cam 49B), but they can also be the same.

[0043] A guide rail (not shown) extending vertically is mounted below the auxiliary cam 49 in the pressure head 20. A slider 50 is slidably supported on this guide rail. A second punch 47 is fixed to the lower end of the slider 50, and a support frame 51 is connected to its upper end. The support frame 51 is sized to accommodate both a lowering cam 49A and a rising cam 49B internally. An abutment portion (not shown) that abuts against the lowering cam 49A is rotatable at the lower end, and an abutment portion (not shown) that abuts against the rising cam 49B is also rotatable at the upper end. Thus, the lowering cam 49A causes the slider 50 to slide downwards via its lower abutment portion, causing the second punch 47 to descend, and the rising cam 49B causes the slider 50 to slide upwards via its upper abutment portion, causing the second punch 47 to rise.

[0044] The above is an explanation of the structure of the stamping press 10 according to this embodiment. Next, the effects of the stamping press 10 will be explained. When the stamping press 10 is started, the camshaft 40 is driven to rotate, causing the pressure head 20 to rise and fall, and stamping the workpiece. Here, the processing reaction force borne by the pressure head 20 during the stamping process varies depending on the position of the pressure head 20, so the pressure head 20 may sometimes tilt. However, in the stamping press 10 of this embodiment, there are three or more pressure head driving cams 42, and the pressure head 20 is pressed down by these three or more pressure head driving cams 42. Therefore, even if the magnitude of the processing reaction force borne by the pressure head 20 varies depending on the position of the pressure head 20, the tilting of the pressure head 20 can be suppressed compared to the conventional method, and the processing accuracy can be improved.

[0045] Furthermore, in the stamping press 10 of this embodiment, the middle portion of the shaft 41 is supported by a support groove 35M that is open at the bottom, making it rotatable. Therefore, assembly is easy, tilting of the pressure head 20 is suppressed, and machining accuracy is improved. Specifically, in the stamping press 10, the shaft 41 bears a greater load when the pressure head 20 is lowered for stamping compared to when it is raised. In other words, the upward load on the shaft 41 is greater than the downward load. However, if rotating support portions 31A are provided that respectively engage with both ends and the middle portion of the shaft 41, assembly of the shaft 41 relative to these multiple rotating support portions 31A becomes difficult. In contrast, in the stamping press 10, the two ends of the shaft 41 are supported by a pair of rotating support portions 31A to enable rotation, and the middle portion of the shaft 41 is supported by a support groove 35M that is open at the bottom, making assembly easy and suppressing deflection of the shaft 41 caused by the upward load. In other words, it suppresses the deflection of shaft 41 during stamping and also suppresses the tilting of pressure head 20, thereby improving machining accuracy.

[0046] Here, Figures 2(A) and 2(B) emphasize the deflection of the shaft 41 obtained through simulation. Specifically, Figure 2(A) shows the shaft 41 deflecting downwards under the load of the pressure head 20 from above, and Figure 2(B) shows the shaft 41 deflecting upwards under the processing reaction force from below. As described above, in the press 10 of this embodiment, the pressure head drive cams 42 at both ends of the shaft 41 are lifting cams with abutment portions 21 at the top and bottom, and the pressure head drive cam 42 in the middle is a lowering cam with abutment portion 21 only at the bottom. Furthermore, there is a gap between the lifting cam and the abutment portions 21 at the top and bottom. Moreover, the shaft 41 is supported at both ends by the rotating support portion 31A and the middle portion by the support groove 35M. Thus, for the load from above, as shown in Figure 2(A), the shaft 41 deflects downwards only by bearing the load through the pressure head drive cams 42 at both ends. On the other hand, for loads from below, as shown in Figure 2(B), the shaft 41 can bear the load from below via the entire pressure head drive cam 42 while restricting upward movement. As such, as described above, the shaft 41 is easy to assemble, and the deflection of the shaft 41 during stamping and the tilting of the pressure head 20 are suppressed, thereby improving machining accuracy.

[0047] As shown in Figures 2(A) and 2(B), the shaft 41 is supported at both ends by the rotary support 31A, so the vertical displacement at both ends is smaller than that at the middle. Furthermore, by using the first and third pressure head drive cams 42 at both ends as lifting cams, the contact with the upper and lower abutment portions 21 can be stabilized. On the other hand, the second pressure head drive cam 42, i.e., the lowering cam, is separately arranged from both ends of the shaft and can move vertically together with the shaft 41, but since it does not have an abutment portion 21 on the upper side, repeated collisions with the upper abutment portion 21 are prevented. Additionally, for the lifting cam, a pair of abutment portions 21 need to be provided on the pressure head 20 for vertical contact, while for the lowering cam, only one abutment portion 21 needs to be provided on the pressure head 20 for downward contact, thus reducing manufacturing costs, including assembly operations. It should be noted that, due to the deflection of shaft 41, the second pressure head drive cam 42 may come into point contact with the upper abutment portion 21, potentially damaging the bearing of the abutment portion 21. However, as mentioned above, since there is no upper abutment portion 21, this situation can be prevented. Furthermore, regarding the middle portion of shaft 41 supported in the support groove 35M, it may collide with the support groove 35M due to vertical displacement along with shaft 41. However, since these portions have a larger area compared to the second pressure head drive cam 42 and the abutment portion 21, and their surfaces abut against each other, they are less likely to be damaged.

[0048] Furthermore, in a press 10 having multiple processing tables S, the processing reaction force is larger when processing is performed on the upstream processing table S in the workpiece transport direction H1 compared to processing on the downstream processing table S. In particular, in a press 10 like the one of this embodiment, which has a workpiece generating mechanism 45 that forms a cylindrical workpiece after punching a blank from a metal sheet at the upstream end of the processing table S, there is a tendency for the processing reaction force to be greater on the upstream side of the press head 20 in the workpiece transport direction H1. In contrast, in the press 10 of this embodiment, more press head driving cams 42 are arranged on the upstream side of the workpiece transport direction H1 compared to the downstream side, thus suppressing the tilting of the press head 20 and improving processing accuracy.

[0049] Furthermore, in this embodiment, the second pressure head driving cam 42 is positioned close to the upstream side of the workpiece transport direction H1, thereby enabling the support groove 35M to be provided in the middle part of the shaft 41, thus effectively suppressing shaft deflection caused by upward load. In addition, in this embodiment, the first and second pressure head driving cams 42 are made thinner than the third pressure head driving cam 42, thus suppressing the shaft 41 from becoming larger in the axial direction.

[0050] [Second Implementation]

[0051] like Figure 3 As shown, the stamping machine 10 of this embodiment differs from the stamping machine 10 of the first embodiment in that it does not have a workpiece generating mechanism 45. In the stamping machine 10 of this embodiment, the press head 20 also bears different processing reaction forces depending on its position. Therefore, it has three or more press head driving cams 42, and the press head 20 is pressed down by these three or more press head driving cams 42. As a result, similar to the stamping machine 10 of the first embodiment, the tilting of the press head 20 can be suppressed compared with the conventional one, and the processing accuracy can be improved.

[0052] [Third Implementation Method]

[0053] like Figure 4 As shown, the stamping press 10 of this embodiment differs from the stamping press 10 of the first embodiment in that the punch 12 and the die are fixed via the die modules 23 and 24. Furthermore, in the stamping press 10 of this embodiment, the shaft 41 is formed by connecting the first shaft 41A and the second shaft 41B via a spline, thereby providing three or more (e.g., four) cams 42 for driving the press head on a single shaft 41. This embodiment achieves the same effect as the first embodiment.

[0054] [Other Implementation Methods]

[0055] (1) In the above embodiment, the stamping press 10 is exemplified as a so-called multi-station stamping press having multiple processing tables S and a conveying device 14, but it may also be a stamping press without the conveying device 14. It should be noted that by applying the structure of the present disclosure in a multi-station stamping press as described in the above embodiment, the tilting of the press head can be suppressed compared with the conventional method, and the effect of improving the processing accuracy can be easily obtained.

[0056] (2) In the workpiece generating mechanism 45 of the above embodiment, the second punch 47 is connected to the auxiliary cam 49, which is rotatably mounted on the shaft 41, via the slider 50. However, this is not limited to this, and the structure could also be as follows: That is, an auxiliary shaft 36 extending parallel to the shaft 41 and rotating in conjunction with the shaft 41 could be provided below the support beam 32 (see [reference]). Figure 1 An auxiliary cam is provided on the auxiliary shaft 36, and the rod is supported in a tilting manner on the support frame 11 of the press 10 and tilted by the auxiliary cam. The front end of the tilting rod is connected to the second punch. Alternatively, an auxiliary shaft 37 extending vertically and connected to the shaft 41 may be provided on the outside of the support frame 11 of the press 10, which supports the pressure head 20 so that it can be raised and lowered. Figure 4 One end of the tilting rod, which is supported on the support frame 11 in a tilting manner, is engaged with the auxiliary cam provided on the auxiliary shaft 37, and the other end is connected to the second punch.

[0057] (3) The plurality of pressure head driving cams 42 in the above embodiment include at least two lifting cams and at least one lowering cam, but are not limited thereto. Specifically, for example, it may include at least two lifting cams and at least one rising cam that only pushes the pressure head 20 upward, or it may include at least two lifting cams, at least one rising cam, and at least one lowering cam. Alternatively, all of the pressure head driving cams 42 may be lifting cams.

[0058] (4) In addition, in the above embodiment, the pressure head driving cam 42 at both ends becomes a lifting cam, and the pressure head driving cam 42 clamped by the lifting cam becomes a lowering cam. However, for example, as shown in FIG5(A), either of the pressure head driving cams 42 at both ends can become a lowering cam, and the other pressure head driving cams 42 can become lifting cams.

[0059] (5) In the above embodiment, a plurality of pressure head driving cams 42 are arranged on the upstream side relative to the downstream side of the workpiece transport direction H1. However, for example, a plurality of them may be arranged on the downstream side of the workpiece transport direction H1. Alternatively, as shown in FIG5(B), the pressure head driving cams 42 may be arranged at equal intervals relative to the workpiece transport direction H1.

[0060] (6) In the above embodiment, the shaft support portion 35 is arranged in the range where the gap between the pressure head driving cams 42 is relatively wide (specifically, between the second pressure head driving cam 42 and the third pressure head driving cam 42). However, the shaft support portion 35 can also be arranged in the range where the gap between the pressure head driving cams 42 is relatively narrow (for example, between the first pressure head driving cam 42 and the second pressure head driving cam 42). In addition, the shaft support portion 35 is not limited to one, and can also be arranged as follows: Figure 4 And as shown in Figure 5(B), there are multiple such arrangements.

[0061] (7) In the above embodiment, there is a gap between the pressure head drive cam 42 and the abutment portion 21, but there may be no gap.

[0062] It should be noted that specific examples of the technology contained in the technical solution are disclosed in this specification and the accompanying drawings, but the technology described in the technical solution is not limited to these specific examples, and also includes various modifications and alterations to the specific examples, as well as methods that extract a part of the specific examples separately.

Claims

1. A stamping machine comprising, for a single press head, having three or more press head driving cams arranged integrally on a common shaft, wherein the press head is pressed downward toward the lower dead center, wherein... The shaft is rotatably supported at both ends by a pair of swivel supports that engage with both ends of the plurality of pressure head drive cams, which clamp each other in the middle, and is also rotatably supported at the middle portion of the shaft, which is open at the bottom, by the middle portion of the shaft where the pressure head drive cams clamp each other. Among the plurality of pressure head driving cams, there are at least two lifting cams that apply both downward and upward forces to the pressure head, and at least one lowering cam that applies only downward forces to the pressure head. Below the pressure head, there is: Multiple processing tables, arranged axially along the shaft, simultaneously perform stamping processing on multiple workpieces by the descent of the pressure head; and A conveying device, which, each time the pressure head rises and falls, transports the multiple workpieces from the multiple processing tables to one of the multiple adjacent processing tables. The processing table at the upstream end is equipped with a workpiece generating mechanism, which punches blanks from a metal sheet and shapes the blanks into cylindrical workpieces. The cylindrical workpiece is deep-drawn or thinned on a plurality of processing tables on the downstream side of the workpiece generating mechanism in the workpiece transport direction. Two pressure head driving cams are arranged on both sides of the workpiece generating mechanism on the upstream side of the workpiece conveying direction. The workpiece generating mechanism is provided with: A cylindrical first punch, which is fixed to the pressure head and moves up and down integrally with the pressure head, punches the blank from the metal plate; The second punch is fitted inside the first punch to form the blank into a cylindrical workpiece; as well as An auxiliary cam, configured to rotate integrally on the shaft, causes the second punch to rise and fall at a different time than the lifting and lowering action of the pressure head.

2. The stamping machine according to claim 1, wherein, The pressure head driving cams at both ends of the plurality of pressure head driving cams are the lifting cams.

3. The stamping machine according to claim 1 or 2, wherein, The plurality of pressure head drive cams are arranged in greater numbers on the upstream side relative to the center of the workpiece transport direction of the pressure head than on the downstream side relative to the center of the workpiece transport direction of the pressure head.

4. The stamping machine according to claim 1 or 2, wherein, The total number of cams used to drive the multiple pressure heads is three. The middle portion of the shaft, which is clamped by the cams driven by the two pressure heads on the downstream side, is supported by the support groove.

5. The stamping machine according to claim 1 or 2, wherein, One or both of the two pressure head driving cams on the upstream side are thinner than the other two pressure head driving cams on the upstream side.

6. A stamping machine comprising, for a single press head, three or more press head driving cams arranged integrally on a common shaft, wherein the press head is pressed downward toward the lower dead center. Below the pressure head, there is: Multiple processing tables, arranged axially along the shaft, simultaneously perform stamping processing on multiple workpieces by the descent of the pressure head; and A conveying device, which, each time the pressure head rises and falls, transports the multiple workpieces from the multiple processing tables to one of the multiple adjacent processing tables. The processing table at the upstream end is equipped with a workpiece generating mechanism, which punches blanks from a metal sheet and shapes the blanks into cylindrical workpieces. The cylindrical workpiece is deep-drawn or thinned on a plurality of processing tables on the downstream side of the workpiece generating mechanism in the workpiece transport direction. Two pressure head driving cams are arranged on both sides of the workpiece generating mechanism on the upstream side of the workpiece conveying direction. The workpiece generating mechanism is provided with: A cylindrical first punch, which is fixed to the pressure head and moves up and down integrally with the pressure head, punches the blank from the metal plate; The second punch is fitted inside the first punch to form the blank into a cylindrical workpiece; as well as An auxiliary cam, configured to rotate integrally on the shaft, causes the second punch to rise and fall at a different time than the lifting and lowering action of the pressure head.

7. The stamping machine according to claim 6, wherein, The plurality of pressure head drive cams are arranged in greater numbers on the upstream side relative to the center of the workpiece transport direction of the pressure head than on the downstream side relative to the center of the workpiece transport direction of the pressure head.

8. The stamping machine according to claim 6 or 7, wherein, The total number of cams used to drive the multiple pressure heads is three. The middle portion of the shaft, which is clamped by the cams driven by the two pressure heads on the downstream side, is supported by the support groove.

9. The stamping machine according to claim 6 or 7, wherein, One or both of the two pressure head driving cams on the upstream side are thinner than the other two pressure head driving cams on the upstream side.

10. The stamping machine according to claim 8, wherein, One or both of the two pressure head driving cams on the upstream side are thinner than the other two pressure head driving cams on the upstream side.

Images