Press working device

Abstract

To provide a punching press machine which does not need blade alignment between a punch and a die.SOLUTION: A press machine 1 includes: a die holding member 21; a die 22 which is attached to the die holding member 21 and has a first punch insertion hole 22a and in which a workpiece M may be placed on the upper side; a punch guide 23 which is attached to the die 22 or the die holding member 21 and has a second punch insertion hole 23a; a punch 24 which is slidably inserted into the second punch insertion hole 23a of the punch guide 23 to be attached to the punch guide 23 and which may punch a predetermined portion Ma from the workpiece M to be inserted into the first punch insertion hole 22a of the die 22 when pushed down; and an upper die load transmission member 31 which comes in contact with the punch 24 to push down the punch 24 when pushed down by a load being applied thereto from above.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a punching press working device.

Background Art

[0002] Press-worked products are completed through several press-working processes such as punching (shearing), bending, and drawing. Among these, a press-working device for punching press-working includes a lower die and an upper die of a mold. Generally, a die is attached to a die holding member in the lower die, and a punch is attached to a punch holding member in the upper die. The lower die and the upper die are attached to a press machine such as a transfer die or a progressive die. Specifically, the upper die is attached to a load-applying mechanism (such as a shank or a slide) of the press machine, and a load can be applied by the load-applying mechanism to push it down. Also, usually, a plurality of guide posts are provided on the die holding member so that the punch can descend properly in balance, and a plurality of holes (such as guide bushes) through which each guide post can slide up and down are provided on the punch holding member.

[0003] In a punching press-working device, a workpiece is placed on the upper side of the die, and then when the upper die is pushed down by a load-applying mechanism, a predetermined portion of the workpiece is punched by the punch. Punching press-working includes blank punching for punching out a blank (initial workpiece) from a strip-shaped metal material as the workpiece, hole punching for punching a hole in the workpiece as the workpiece, and edge cutting for cutting off an extra edge from the workpiece as the workpiece.

[0004] In punching press working devices, due to factors such as the structure of the load applying mechanism, it is not uncommon for a bias (eccentric load) to occur in the load applied to the upper die by the load applying mechanism. If the eccentric load occurs and is directly transmitted to the punch and the punching of a predetermined portion of the workpiece is performed by the punch, the workpiece may not be punched at the normal position, may not maintain the normal shape, or may easily generate large burrs. Also, in that case, damage to the punch or die is likely to occur. Therefore, generally, it is necessary to adjust the attachment of the die to the die holding member or the attachment of the punch to the punch holding member, etc., so that the die and the punch are in the correct positional relationship and the die and punch are adjusted (positional relationship adjusted) so that the punch punches the workpiece.

[0005] Among punching press working devices, there are those known that reduce the eccentric load transmitted to the punch even when an eccentric load occurs. For example, in Patent Document 1, a punch holder (punch holding member) is attached to a press ram (load applying mechanism) via a load transmission connecting means and a connecting rod. In the load transmission connecting means, the member on the punch holding member side and the member on the load applying mechanism side are in contact with each other with curved surfaces, and a press device in which the connecting rod is elastically deformable is disclosed. In this press device, it is stated that the eccentric load is reduced by the punch (and the punch holding member) via the load transmission connecting means and the connecting rod.

[0006] Also, Patent Document 2 discloses a press device in which the upper die is divided into two (the upper side is an upper frame (and a moving table fixed thereto), and the lower side is a punch plate) and separated. This upper frame is fixed and attached to a conduction mechanism (load applying mechanism), and a rod that elastically moves up and down downward is attached. The punch plate has a punch attached thereto. In this press device, it is stated that the eccentric load is reduced by the punch (and the punch plate) via the rod that elastically moves up and down.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in conventional punching press working devices including Patent Documents 1 and 2, even if the unbalanced load is reduced, blade alignment between the punch and the die is necessary.

[0009] The present invention has been made in view of such circumstances, and an object thereof is to provide a punching press working device that does not require blade alignment between the punch and the die.

Means for Solving the Problems

[0010] To achieve the above object, the press working device according to claim 1 includes a die holding member, a die attached to the die holding member, having a first punch insertion hole and on which a workpiece can be placed on the upper side, a punch guide attached to the die or the die holding member and having a second punch insertion hole, a punch slidably inserted into the second punch insertion hole of the punch guide and attached to the punch guide, which punches a predetermined portion from the workpiece when pushed down and can be inserted into the first punch insertion hole of the die, and an upper die load transmission member that contacts the punch when a load is applied from above and pushed down and can push down the punch.

[0011] The press working device according to claim 2 is the press working device according to claim 1, wherein the punch has a sliding portion slidable in the second punch insertion hole and a blade portion having a smaller diameter than the sliding portion below the sliding portion.

[0012] The press working apparatus according to claim 3 is the press working apparatus according to claim 1 or 2, wherein the punch has a flange portion, and a spring is further provided between the punch and the punch guide below the flange portion so that the punch can rise when the punch is not pushed down.

Effect of the Invention

[0013] According to the press working apparatus of the present invention, it is possible not to require blade alignment between the punch and the die.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0015] Embodiments of the present invention will be described below. The press working apparatus 1 according to an embodiment of the present invention performs punching press working, and as shown in FIG. 1, includes a lower die 2 and an upper die 3 of a mold. The lower die 2 and the upper die 3 are attached to a press 4. The upper die 3 is specifically attached to a load applying mechanism 41 of the press 4 and can be pushed down by applying a load by the load applying mechanism 41. The press working apparatus 1 can be applied to blank punching, hole punching, edge cutting, and the like.

[0016] The lower die 2 includes a die holding member 21, a die 22, a punch guide 23, and a punch 24.

[0017] The die holding member 21 is fixedly attached to the press 4. The die holding member 21 can be attached to the press 4 using screws or the like (not shown). The die holding member 21 can have a die holding member hole 21a that is located below and communicates with the first punch insertion hole 22a described later. The receiving member 25 described later can be inserted through the die holding member hole 21a.

[0018] The die 22 is fixedly attached to the die holding member 21. The die 22 can be attached to the die holding member 21 using screws 22A.

[0019] Further, the die 22 has a first punch insertion hole 22a through which a punch 24 (specifically, a part thereof) to be described in detail later can be inserted from above. The workpiece M is placed on the upper side of the die 22. Also, as will be described later, a predetermined portion Ma punched out from the workpiece M can be inserted into the first punch insertion hole 22a from below and supported by a receiving member 25 that can descend in response to the descent of the punch 24. In the case of blanking, the strip-shaped metal material is the workpiece M, and the blank is the predetermined portion Ma. In the case of punching, the workpiece is the workpiece M, and the hole portion is the predetermined portion Ma. In the case of trimming, the workpiece is the workpiece M, and the workpiece with the excess edge removed is the predetermined portion Ma. In the case of punching, since the predetermined portion Ma becomes scrap, it is also possible not to provide the receiving member 25.

[0020] The punch guide 23 is fixedly attached to the die 22. For attaching the punch guide 23 to the die 22, screws 23A can be used. Also, for attaching the punch guide 23 to the die 22, together with or instead of attachment by screws 23A (or other methods), in order to make it easier for the punch guide 23 and the die 22 to be in an accurate positional relationship, positioning holes 23b are formed in the punch guide 23 at one or more locations, positioning holes 22b are formed in the die 22 to have the same diameter as the positioning holes 23b, and positioning pins 23B can be fitted by sliding them into the positioning holes 23b, 22b. Note that the punch guide 23 is preferably fixedly attached to the die 22 in terms of an appropriate positional relationship between the punch 24 and the die 22, which will be described in detail later, but it may also be possible in some cases to attach it fixedly to the die holding member 21.

[0021] Also, the punch guide 23 has a second punch insertion hole 23a through which the punch 24, which will be described in detail later, can be slidably inserted. The punch guide 23 is fixedly attached to the die 22 (or the die holding member 21) such that the second punch insertion hole 23a is directly above the first punch insertion hole 22a of the die 22 (that is, when viewed from above, the second punch insertion hole 23a and the first punch insertion hole 22a are concentric (coaxial)).

[0022] The punch 24 is slidably inserted into the second punch insertion hole 23a of the punch guide 23 and is attached to the punch guide 23. When the punch 24 is pushed down, it punches out a predetermined portion Ma from the workpiece M and can be inserted into the first punch insertion hole 22a of the die 22.

[0023] The punch 24 can have a sliding portion 24a as the portion slidable in the second punch insertion hole 23a, and a blade portion 24b having a smaller diameter than the sliding portion 24a below it. Thereby, when inserting the punch 24 into the second punch insertion hole 23a during assembly, it can prevent the blade portion 24b from hitting the inner wall of the second punch insertion hole 23a and prevent damage. The axial length of the blade portion 24b is usually longer than the thickness of the workpiece M.

[0024] Further, the punch 24 has a flange portion 24c, and a spring 26 can be provided between the punch 24 and the punch guide 23 below the flange portion 24c so that the punch 24 can rise when the punch 24 is not pushed down. A plurality of springs 26 (for example, four) can be provided.

[0025] Specifically, a pole 27 serving as the shaft body is provided inside the spring 26, and one end of the pole 27 can be fixed to the punch guide 23. A pole through-hole 24ca through which the pole 27 passes is formed in the flange portion 24c, and the other end of the pole 27 has a larger diameter and serves as a stopper 27a that limits the maximum distance between the flange portion 24c and the punch guide 23. In addition, in some cases, one end of the pole 27 may be fixed to the flange portion 24c, a pole through-hole may be formed in the punch guide 23, and a stopper 27a may be provided below the hole.

[0026] The upper die 3 includes an upper die load transmission member 31. The upper die 3 can further include an upper die load transmission member holding member 32, and the upper die load transmission member 31 is fixedly attached to the upper die load transmission member holding member 32. The upper die load transmission member 31 can be attached to the upper die load transmission member holding member 32 using screws 31A. The upper die load transmission member holding member 32 is fixedly attached to a load applying mechanism (for example, a shank or a slide) 41. The upper die load transmission member holding member 32 can be attached to the load applying mechanism 41 using screws or the like (not shown). Note that the upper die load transmission member 31 may be directly attached to the load applying mechanism 41. When a load is applied from above by the load applying mechanism 41 and the upper die load transmission member 31 is pushed down, the upper die load transmission member 31 can contact the punch 24 and push down the punch 24.

[0027] The shape of the upper die load transmission member 31 is not particularly limited, but as a portion that contacts the punch 24, a punch contact convex portion 31a can be provided on the lower surface. The cross-section of the punch contact convex portion 31a can be substantially trapezoidal, substantially semi-circular, or the like. Further, the upper die load transmission member 31 can be formed with a pole accommodation recess 31b that accommodates the pole 27 (and the stopper 27a) when descending so that the pole 27 (and the stopper 27a) does not interfere with the descent of the upper die load transmission member 31.

[0028] After the punch 24 punches a predetermined portion Ma from the workpiece M and reaches the lowest point, the upper die load transmission member 31 rises. Then, the punch 24 rises until it contacts the stopper 27a by the elastic force of the spring 26, and the upper die load transmission member 31 becomes separated from the punch 24.

[0029] In the press working apparatus 1 having the configuration described above, the upper die load transmission member 31 is pushed down by the load applying mechanism 41 from the state shown in FIG. 1, contacts the punch 24, and applies a load thereto. When a load is applied to the punch 24, the punch 24 is pushed down while sliding in the second punch insertion hole 23a of the punch guide 23, and punches a predetermined portion Ma from the workpiece M as shown in FIG. 2.

[0030] At this time, even if an uneven load occurs in the load from the load applying mechanism 41, the positional relationship between the punch 24 and the die 22 does not change, and the punch 24 is pushed down while sliding in the second punch insertion hole 23a of the punch guide 23 to punch a predetermined portion Ma from the workpiece M. Therefore, it is not necessary to perform blade alignment (adjustment of the positional relationship) between the die 22 and the punch 24.

[0031] Further, since it is not necessary to provide a plurality of guide posts as described in the background art so that the punch 24 can descend properly, the press working apparatus 1 can be made smaller, and thereby it becomes easier to incorporate it into a space restricted in a press 4 such as a transfer type or a progressive type.

[0032] As described above, the press working apparatus according to the embodiment of the present invention has been explained. However, the present invention is not limited to that described in the above embodiment, and various modifications are possible within the scope of the matters described in the claims. For example, the detailed shapes of the die 22, the punch guide 23, the punch 24, etc. can be various according to the shape of the workpiece M or its predetermined portion Ma.

Explanation of Signs

[0033] 1 Press working apparatus 2 Lower die 21 Die holding member 21a Die holding member hole 22 Die 22a First punch insertion hole 22b Positioning hole 22A Screw 23 Punch guide 23a Second punch insertion hole 23b Positioning hole 23A Screw 23B Positioning pin 24 Punch 24a Sliding portion 24b Blade portion 24c Flange portion 24ca Pole passing hole 25 Receiving member 26 Spring 27 Pole 27a Stopper 3 Upper die 31 Upper die load transmission member 31a Punch contact convex portion 31b Pole housing recess 31A Screw 32 Upper die load transmission member holding member 4 Press 41 Load applying mechanism M Workpiece Ma Predetermined portion

Claims

1. A die holding member, a die attached to the die holding member, having a first punch insertion hole and on which a workpiece can be placed on the upper side, a punch guide attached to the die or the die holding member and having a second punch insertion hole, a punch slidably inserted into the second punch insertion hole of the punch guide and attached to the punch guide, which punches out a predetermined portion from the workpiece when pushed down and can be inserted into the first punch insertion hole of the die, an upper die load transmission member that contacts the punch and can push down the punch when a load is applied from above and it is pushed down, A press working apparatus comprising the above.

2. In the press working apparatus according to Claim 1, the punch has a slidable sliding portion in the second punch insertion hole and a blade portion having a smaller diameter than the sliding portion below it. A press working apparatus.

3. In the press working apparatus according to Claim 1 or 2, the punch has a flange portion, A press working apparatus further comprising a spring between the punch guide and below the flange portion so that the punch can rise when the punch is not pushed down.

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