JP2017192947A - Mounting structure of punching punch to holder and punching punch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a punching punch to a holder which makes a punching punch hard to crack upon the punching work of a metal thick plate and secures long serviceability, and the punching punch.SOLUTION: A punching punch 10 is formed of a high-rigidity material such as high-speed tool steel and integrally provided in a coaxial manner with a discoid head 11, a long columnar shank 12 smaller in diameter than the head 11, and an edge 13 smaller in diameter than the shank 12 and nearly equal in length to the shank 12. A holder 17 keeps a lower mounting plate 18 overlapped on an upper base board 21, where the lower mounting plate 18 is provided with a mount hole 19 penetrating vertically. When the punching punch 10 in which the shank 12 is wound with a buffer member 15 is fitted with the mount hole 19 of the mounting plate 18 from the side of the edge 13, the tip side of the edge 13 and that of the shank 12 project from the lower side of the mount hole 19 to keep the buffer member 15 sandwiched between the head 11 and a step part 19c of the mount hole 19. The mount plate 18 is fixed by overlapping on the base board 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure for attaching a punch for use in a press device to a holder and a punch for punch.

  As this type of punch for punching, as shown in Patent Document 1, a punch having a flange portion, a shank portion, and a cutting edge portion formed of a hard material such as alloy tool steel or high-speed tool steel is known. The punch for punching is attached to a punch holder of a press die and used for punching for forming a processing hole in a workpiece such as a steel thick plate.

  By the way, in such a punching process, as shown in FIG. 9, a compressive load is applied to the punch 1 for punching a workpiece, and a large negative load is applied to the subsequent breakthrough. Due to such a load applied at the time of punching, stress concentration occurs from the shank portion 3 to the head 2 of the punch 1, and as a result, a crack Bs is likely to occur at the boundary with the shank portion 3 of the head 2. Further, when the punch 1 for punching was pulled out from the workpiece, a tensile load was applied to the punch 1 for punching, and a crack Bh was likely to occur in the head 2 due to the tensile impact force. As a result, since the life of the punch 1 for punching is significantly reduced, the cost of the punch 1 is increased, frequent replacement of the punch 1 is required, and the trouble of replacing the punch is complicated.

JP 2011-88161 A

  The present invention is intended to solve the above-mentioned problem. A punching punch mounting structure in which a punching punch such as a thick steel plate is not easily cracked and a long life is ensured, and a punching The purpose is to provide a punch.

  In order to achieve the above object, the structural features of the present invention include a first mounting hole having a large and a small diameter and a mounting plate portion in which the second mounting hole is disposed coaxially through the plate surface, A rod having a head portion made of a hard material, a shank portion and a blade edge portion which are coaxially arranged in order of increasing diameter on a holder having a base portion superimposed on the surface of the plate portion on the first mounting hole side In the punch for punching, the blade edge portion and the shank portion are inserted into the second mounting hole, and the head portion is accommodated in the first mounting hole so as to be at the stepped portion at the boundary between the first mounting hole and the second mounting hole. In the structure for attaching the punch for punching to the holder, the annular cushioning member is wound around the shank part and is sandwiched between the head part and the step part in the first attachment hole. .

  In addition, as a material of the buffer member, there are resin materials having elasticity such as urethane, vinyl chloride, polyethylene, and silicone, and urethane for high load is particularly preferable. It is also possible to use a soft metal such as copper, aluminum, or soft iron. Furthermore, it is also possible to use a damping steel plate or the like in which steel plates are bonded with an adhesive.

  In the present invention configured as described above, the buffer member is sandwiched between the head of the punch for punching and the stepped portion in the first mounting hole of the holder. The buffer member relieves stress concentration due to the punching load including the compressive load generated at the boundary with the shank portion of the head of the punch for punching and the large negative load during breakthrough. Therefore, the generation of cracks due to stress concentration at this portion can be suppressed. Further, when the punch for punching is pulled out from the workpiece, the impact force due to the tensile load generated at the boundary with the shank portion of the head is suppressed by the buffer member, and the occurrence of cracks due to the impact force is also suppressed. As a result, in the present invention, the life of the punch for punching is increased, so that frequent replacement work of the punch for punching becomes unnecessary, the cost of the punch for punching is greatly reduced, and the labor for replacing the punch is greatly increased. Reduced.

  In the present invention, the buffer member is preferably made of urethane resin. Thereby, the effect | action of the buffer member which suppresses generation | occurrence | production of the crack to the punch for punching is exhibited effectively.

  Further, the present invention is a rod-shaped punch for punching having a head made of a hard material coaxially arranged in order of increasing diameter, a shank part, and a blade edge part, and a boundary with the head part of the shank part An annular buffer member is wound around the portion. In this case, it is preferable that the buffer member is made of urethane resin.

  Another feature of the present invention is that the holder has a mounting plate portion having a mounting hole penetrating the plate surface and a base portion that is overlapped with the mounting plate portion so as to cover one surface, and is made of a rod-like material made of a hard material. The punch for punching is a punching punch mounting structure in which a punching punch whose one end is a cutting edge is inserted into and fixed to a mounting hole at the other end and the cutting edge protrudes from the mounting plate. A slit portion following the surface of the mounting plate portion is provided at at least two positions on the side surface of the plate, and a flat buffer plate material extending in the slit portion is provided while being superposed and fixed on the surface of the mounting plate portion.

  In another feature configured as described above, at least two flat cushioning plates fixed in an overlapping manner on the surface of the mounting plate portion extend into the slit portion following the surface of the mounting plate portion on the side surface of the punch for punching. Therefore, during punching with a press machine, stress concentration due to the punching load generated at the boundary with the punching punch mounting plate when the workpiece is punched is alleviated. The generation of cracks due to is suppressed. In addition, when the punch for punching is pulled out of the workpiece, the impact force due to the tensile load generated at the boundary with the mounting plate portion of the punch for punch is alleviated by the buffer plate material, and the generation of cracks due to the impact force is also suppressed. . As a result, in the present invention, the life of the punch for punching is increased, so that frequent replacement work of the punch for punching becomes unnecessary, the cost of the punch for punching is greatly reduced, and the labor for replacing the punch is greatly increased. Reduced.

  In another feature, the buffer plate material preferably has a three-layer structure in which a resin plate is sandwiched between two metal plates. Thereby, since the strength of the buffer plate material is ensured, the punch for punching can be firmly fixed to the holder.

  The resin plate is preferably made of urethane resin. Thereby, the effect | action of the buffer member which suppresses generation | occurrence | production of the crack to the punch for punching is exhibited effectively.

  In the present invention, since the buffer member is sandwiched between the head of the punch for punching and the stepped portion in the first mounting hole of the holder, the above-described punching at the time of punching the workpiece at the time of punching by the press device The stress concentration due to the load and the generation of impact force due to the tensile load at the time of pulling the punch for punching from the workpiece can be suppressed, and the occurrence of cracks associated therewith can also be suppressed. As a result, in the present invention, the life of the punch for punching is increased, so that frequent replacement work of the punch for punching becomes unnecessary, the cost of the punch for punching is greatly reduced, and the labor for replacing the punch is greatly increased. Reduced.

  According to another feature of the present invention, at least two flat buffer plates fixed in an overlapping manner on the surface of the mounting plate are extended into a slit portion following the surface of the mounting plate on the side surface of the punch for punching. As a result, the stress concentration due to the punching load applied to the punch for punching during the punching process by the press device and the generation of impact force due to the tensile load can be suppressed, and the generation of cracks associated therewith can be suppressed. As a result, the life of the punch for punching is also increased in other features, eliminating the need for frequent replacement work for punching punches, greatly reducing the cost of punching punches and greatly reducing the need for punch replacement. Reduced to

It is a partially broken sectional view which shows the attachment structure to the holder of the punch for punch which concerns on Example 1 of this invention. It is a general view which shows the punch for the same punching. It is the top view and side view which show the buffer member attached to the punch for the same punching. It is a general view showing another punch for punching. It is a general view which shows the punch for punching of a taper head type. It is a partially broken sectional view which shows the attachment structure to the holder of the punch for punch which concerns on Example 2. FIG. It is a fragmentary top view which shows the attachment structure to the holder of the punch for punching. It is a side view which shows roughly the buffer board material used in the attachment structure to the holder of the punch for the same punching. It is a fragmentary figure which shows a part of punch for punching which is a prior art example. It is a partial view showing a part of a punch for punching of a taper head type as a conventional example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken sectional view showing a structure for attaching a punch for punching to a holder according to the first embodiment. FIG. 2 shows an overall view of the punch for punching. The punch 10 for punching is formed of a high-hardness material such as high-speed tool steel, alloy tool steel, titanium carbonitride sintered body, and has a disk-shaped head 11 and a smaller diameter than the head 11. A long cylindrical shank portion 12 and a blade edge portion 13 having a smaller diameter than the shank portion 12 and substantially the same length as the shank portion 12 are integrally provided in a coaxial manner. The blade edge portion 13 is a cylindrical driving portion 13b having a small diameter of about 1/3 of the diameter of the shank portion 12 via a connecting portion 13a having a diameter reduced to a substantially conical shape. In the first embodiment, a buffer member 15 made of a high load urethane resin having a thin cross-sectional quadrangular shape and an annular shape as shown in FIG. 3 is wound around a boundary portion between the shank portion 12 and the head portion 11. Yes.

  The punching punch 10 is attached to a holder 17 of a punching press device as shown in FIG. In the holder 17, a lower mounting plate portion 18 and an upper base portion 21 are overlapped, and the mounting plate portion 18 is provided with a mounting hole 19 penetrating vertically. The mounting hole 19 has an upper hole 19a which is a first mounting hole into which the head portion 11 of the punch 10 is inserted and a lower hole 19b which is a second mounting hole through which the shank portion 12 of the punch 10 is inserted coaxially. The boundary between the upper hole 19a and the lower hole 19b is a stepped portion 19c. The upper hole 19 a is slightly larger in diameter than the head 11 and slightly deeper than the thickness of the head 11. The lower hole 19 b has substantially the same diameter as the shank portion 12 and is shorter than the shank portion 12.

  When the punching punch 10 is fitted into the mounting hole 19 of the mounting plate 18 from the blade tip 13 side in a state where the buffer member 15 is wound around the shank portion 12, the blade tip portion 13 and the tip end side of the shank portion 12 are attached. The buffer member 15 protrudes from the lower side of the hole 19 and is sandwiched between the head portion 11 and the step portion 19 c of the mounting hole 19. In this state, the mounting plate portion 18 is overlapped and fixed to the base portion 21.

  A punching table 23 is disposed below the holder 17 in which the punching punch 10 is set. The punching table 23 is provided with a guide hole 24 extending from the upper surface below the cutting edge portion 13. The guide hole 24 is coaxially provided with an upper part 24a having substantially the same diameter as the cutting edge part 13 and a lower side part 24b having a diameter larger than that of the upper part 24a, and is generated by punching while guiding the lower end side of the cutting edge part 13. Trash is dropped and accommodated downward. On the punching table 23, a work 26, which is a thick plate made of stainless steel for forming a punching hole, is placed.

  In the first embodiment configured as described above, as shown in FIG. 1, the circular hole punching work of the workpiece 26 is performed by moving the holder 17 downward as indicated by the arrow P. The cutting edge portion 13 punches the workpiece 26 and is inserted into the upper portion 24a of the guide hole 24, and punching waste generated at that time is dropped and accommodated in the lower portion 24b. When a workpiece is punched, stress concentration occurs due to a punching load including a compressive load applied to the boundary between the head 11 of the punching punch 10 and the shank portion 12 and a large negative load applied during breakthrough. However, in the first embodiment, the buffer member 15 is sandwiched between the head 11 of the punching punch 10 and the stepped portion 19c in the upper hole 19a of the holder 17, so that Since stress concentration at the boundary is relaxed, generation of cracks due to stress concentration at this portion is suppressed.

  Further, when the punching punch 10 is pulled out from the workpiece 26, an impact force due to a tensile load is generated at the boundary between the head 11 of the punching punch 10 and the shank portion 12. However, since the impact force is mitigated by the buffer member 15 being sandwiched between the head 11 and the stepped portion 19c of the punching punch 10 in the upper hole 19a of the holder 17, cracks due to this impact force are also generated. It can be suppressed. As a result, in the first embodiment, since the life of the punching punch 10 is increased, the frequent replacement work of the punching punch 10 is not required, the cost of the punching punch 10 is greatly reduced, and the punch replacement is possible. The effort is also greatly reduced. In particular, in Example 1, the use of a high-load urethane resin as the buffer member 15 exhibits the above-described crack suppression effect very well.

  As an example of the punch 10 for punching, in addition to the shape shown in FIG. 2, a cylindrical punching punch 30 in which the diameter of the blade edge portion 33 is slightly smaller than the shank portion 32 as shown in FIG. 4 is also used. In addition, the buffer member 15 made of an annular high-load urethane resin is similarly wound around the boundary portion between the shank portion 32 and the head portion 31. Further, as the punching punch 35, a so-called taper head punch as shown in FIG. 5 is also used. The punch 35 for punching has a head portion 36, a shank portion 37, and a blade tip portion 38, and the head portion 36 is a tapered portion 36b inclined in a conical surface following the cylindrical portion 36a. An annular taper ring 39 is fitted on the outer periphery of the taper portion 36b. An annular buffer member 15 is similarly wound around the shank portion 38 following the taper ring 39. The taper ring 39 can also be made of the same material as the buffer member.

  Next, Example 2 will be described with reference to FIGS.

  The second embodiment relates to a punch 40 for punching for punching an irregularly shaped hole that is not a simple round hole as in the first embodiment. As shown in FIGS. 6 and 7, the punch 40 for punching has a vertically long and straight column shape, the upper and lower flat surfaces 41 and 42 are different in shape and parallel to each other, and the upper end side is a cutting edge portion 43. A pair of slit portions 44 extending in the front-rear direction is provided in the vicinity of the lower plane 42 on both the left and right sides. The punching punch 40 is vertically attached to the upper side of the holder 45 of the punching press device. In the holder 45, the upper mounting plate portion 47 is overlapped with the lower base portion 46, and the mounting plate portion 47 is provided with a mounting hole 48 penetrating vertically. A punching punch 40 is inserted into the mounting hole 48 from the lower surface 42 side. In this state, the lower surface of the slit portion 44 is flush with the upper surface of the mounting plate portion 47.

  A part of the buffer plate material 51 fixed to the attachment plate portion 47 is inserted into the pair of slit portions 44. As shown in FIGS. 7 and 8, the buffer plate material 51 is a rectangular thick plate, and has a three-layer structure in which a high-load urethane plate 53 is sandwiched between two stainless steel plates 52. A pair of mounting holes 54 penetrating the surface is provided. The buffer plate material 51 is placed on the upper surface of the mounting plate portion 47, one side edge is inserted into the slit portion 44, and is screwed into the mounting hole (not shown) of the mounting plate portion 47 through the mounting hole 54 with the bolt 56. By doing so, it is fixed to the mounting plate portion 47. Thereby, the punching punch 40 is firmly attached to the holder 45.

  In the second embodiment configured as described above, the workpiece 45 (not shown) is punched by moving the holder 45 upward as indicated by the arrow P, as shown in FIG. Here, the two flat buffer plate members 51 fixed to be overlapped on the surface of the mounting plate portion 47 are extended into the slit portion 44 following the surface of the mounting plate portion 47 on the side surface of the punch 40 for punching. Thus, during the punching process by the press device, the stress due to the punching load including the compressive load generated at the boundary with the mounting plate portion 47 of the punching punch 40 and the negative large load at the breakthrough when the workpiece is punched Since the concentration is relaxed, the generation of cracks due to the stress concentration at this portion is suppressed. Further, since the generation of impact force due to the tensile load at the boundary with the mounting plate portion 47 of the punching punch 40 is reduced when the punching punch 40 is pulled out from the workpiece, the generation of cracks due to this impact force is also suppressed. It is done.

  As a result, in the second embodiment, the life of the punching punch 40 is increased, so that frequent replacement work of the punching punch 40 is not required, the cost of the punching punch 40 is greatly reduced, and punch replacement is possible. The effort is also greatly reduced. In particular, in Example 2, when the buffer plate material 51 includes the urethane plate 53, a very good crack suppression effect can be obtained. Further, in the second embodiment, since the buffer plate material 51 has a three-layer structure in which the urethane plate 53 is sandwiched between two stainless steel plates 52, the strength is ensured. Can be fixed to.

  In the first embodiment, the punch for punching has a cylindrical shape, but may have an elliptical column shape, a rectangular column shape, or the like. Further, in Examples 1 and 2, a high load urethane resin is used as the material of the buffer member and the buffer plate material, but not limited to this, other urethane, elastic materials such as vinyl chloride, polyethylene, and silicone are used. In addition, it is also possible to use soft metals such as copper, aluminum, and soft iron, and vibration-damping steel sheets obtained by bonding steel sheets with an adhesive. In addition, the punching punch and the structure of the holder used in the first and second embodiments are merely examples, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10,30,35 ... Punch for punching, 11 ... Head, 12 ... Shank part, 13 ... Cutting edge part, 15 ... Buffering member, 17 ... Holder, 18 ... Mounting plate part, 19 ... Mounting hole, 19a ... Top hole, 19b ... lower hole, 19c ... step part, 21 ... base part, 23 ... punching table, 40 ... punch for punching, 43 ... blade edge part, 44 ... slit part, 45 ... holder, 46 ... base part, 47 ... mounting plate part 48 ... mounting holes, 51 ... buffer plate material, 53 ... urethane plate.

Claims (7)

  A mounting plate portion in which a first mounting hole and a second mounting hole having large and small diameters are arranged coaxially through the plate surface, and a base that is superimposed on the surface of the mounting plate portion on the first mounting hole side. A rod-shaped punch for punching integrally having a head made of hard material, a shank portion and a blade edge portion, which are coaxially arranged in order of increasing diameter, in a holder having a blade portion, and the blade edge portion and the shank portion are 2 A punch for punching that is inserted into the mounting hole and that the head is accommodated in the first mounting hole and locked at a stepped portion at the boundary between the first mounting hole and the second mounting hole. The punch for punching is characterized in that an annular cushioning member is wound around the shank portion and is sandwiched between the head portion and the stepped portion in the first attachment hole. Mounting structure to the holder.   The structure for attaching a punch for punching to a holder according to claim 1, wherein the buffer member is made of urethane resin.   A rod-shaped punch for punching having a head portion made of a hard material coaxially arranged in order of increasing diameter, a shank portion, and a blade tip portion, and is annular at the boundary portion of the shank portion with the head portion A punch for punching, characterized in that a buffer member is wound.   The punch for punching according to claim 3, wherein the buffer member is made of urethane resin.   A holder having a mounting plate portion having a mounting hole penetrating the plate surface and a base portion that is superimposed on the mounting plate portion so as to cover one surface has a rod-like shape made of a hard material and has a blade edge portion on one end side. In a structure for attaching a punch for punching to a holder, in which the punch for punching is inserted into and fixed to the mounting hole at the other end, and the cutting edge side protrudes from the mounting plate, at least two of the side surfaces of the punch for punching For punching, characterized in that a slit portion following the surface of the mounting plate portion is provided at a location, and a flat buffer plate material is provided which is fixed to the surface of the mounting plate portion so as to overlap and extend into the slit portion. Mounting structure to punch holder.   6. The structure for attaching a punching punch to a holder according to claim 5, wherein the buffer plate material has a three-layer structure in which a resin plate is sandwiched between two metal plates.   The structure for mounting a punch for punching to a holder according to claim 6, wherein the resin plate is made of urethane resin.

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