JPH0715124U - Puncher punch - Google Patents

Abstract

(57) [Summary] [Purpose] A plate cut formed by a punch punch is continuously and smoothly advanced by a continuous and gradual shearing action. A puncher punch 10 has a foremost end face 16 extending diametrically to an outer peripheral portion of a tip portion 12. The first and second cutting blades 20 extending in the circumferential direction over the width of the foremost end surface by the respective edge portions of the foremost end surface and the outer peripheral surface of the tip end portion.
Are formed respectively. The punch 10 is further provided with the first front end face.
A third cutting edge 14 that is continuous with the first cutting edge 20 formed at the end edge portion and extends rearward in the circumferential direction from the first cutting edge, and a second cutting edge portion that is formed at the second end edge portion of the foremost end face. A fourth cutting edge 1 that is continuous with the cutting edge and extends rearward from the second cutting edge in the same circumferential direction as the third cutting edge.
4 is further provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch punch, and more particularly, to a punch structure attached to a front end portion of a punch rod of a puncher.

[0002]

[Prior art]

 There is known a portable puncher that includes a fixed die and a punching punch, and punches a workpiece such as a steel plate with a cutting edge of the punch (Japanese Patent Laid-Open No. 58-224029). 3-189022). Such a puncher has a hydraulic actuating mechanism including a hydraulic cylinder as an actuating device for the punch, and the punch is attached to the front end portion of the piston rod of the hydraulic cylinder. The front end surface of the punch is generally formed flat, and a guide pin is provided so as to protrude from the shaft core. The guide pin is used to align the plate and the punch, and is visually aligned with the marking line of the plate immediately before punching. The applicant of the present invention, in such puncher punch, reduces the punching load of the puncher, secures the sharpness of the cutting edge, and has a shape that is difficult for the so-called prying force to exert when punching holes. A punch for use is proposed in Japanese Patent Application No. 4-5587 (Japanese Patent Laid-Open No. Sho 5). One type of puncher punch disclosed in that patent application is shown in FIG. In FIG. 5, the punch 110 is formed on the outer circumference of the front end surface, and has a cutting edge 114 that makes a right angle or an acute angle with the outer circumferential surface 112 of the punch, and a front end surface 115 that extends from the cutting edge 114 radially inward of the punch. The front end surface 115 is provided with a protruding portion 119 that protrudes forward. The punch 110 further includes a side wall 118 extending forward at an angle with respect to the front end face 115 and forming a front edge of the side wall 118 and forming a right angle or an obtuse angle with respect to the side wall 118. Equipped with. Further, the frontmost end surface 116 is formed with a positioning groove 117 extending from the axial center of the punch 110 to the edge of the frontmost end surface 116.

[0003]

According to the punch having the above structure, since the front end portion of the punch is gradually pressed against the plate material, the punching load is dispersed, the maximum punching load is reduced, and at the time of punching. The vibrations that act on the actuator are alleviated, and the durability of the actuator is improved. In addition, since the side wall of the protrusion hits the edge of the existing hole at a fairly acute angle during the overweight processing, or the cutting edge on the outer periphery of the front end surface hits the edge of the hole, so-called prying force is hard to act on the punch. Thus, the punch of this structure has achieved its intended purpose. However, in the punch having the above structure, the front end face of the punch and the front end face located relatively rearward are gradually pressed by the plate material, so that the front end face and the front end face respectively have peripheral edges. The shearing action of the formed cutting edge acts on the plate material in a stepwise manner, and the plate material is subjected to a gradual and continuous strain or bending deformation action by the protrusion while the cutting blade exerts the shearing action. For this reason, in the shearing machine equipped with the punch, although the vibration acting on the actuating device is alleviated, the actuating device and the fingers of the worker are still subjected to a stepwise impact, and a certain degree of vibration is caused. Is occurring. Therefore, there is still room for further improvement in the punch having the above-mentioned conventional structure.

The present invention has been made in view of the above points, and an object of the present invention is to continuously and smoothly advance a cut edge of a plate material by a continuous and gradual shearing action, thereby punching. An object of the present invention is to provide a puncher punch that can further disperse the shock of time and further reduce the vibration acting on the actuator or the finger of the worker.

[0005]

[Means and Actions for Solving the Problems]

 In order to achieve the above first object, the present invention provides a puncher punch having a cutting edge formed on an outer peripheral portion of a tip portion, the punch having a front end surface extending diametrically to the outer peripheral portion of the tip portion. The first and second cutting edges extending in the circumferential direction over the width of the frontmost front end face are formed by the respective edge portions of the frontmost end face and the outer peripheral surface of the front end portion. A third cutting edge, which is continuous with the first cutting edge formed on the first edge of the surface and extends rearward in the circumferential direction from the first cutting edge, and a second edge of the foremost end surface. A punch punch for punching, further comprising: a fourth cutting edge that is continuous with the second cutting edge and extends rearward from the second cutting edge in the same circumferential direction as the third cutting edge. The punch for punches having the above structure is configured such that the plate material is initially sheared by the first and second cutting blades located at both edges of the front end face, and the third and fourth cutting blades are continuous with the first and second cutting blades. Then, the plate material is sheared following the first and second cutting edges. The cut edge of the plate material continuously and gradually advances in the circumferential direction from the regions of both end edges of the front end face. Further, the strain or bending deformation of the plate material along the longitudinal side edge of the frontmost end face converges or disappears as the cutting edge is advanced by the first to fourth cutting edges. Thus, according to the punch having the above-described configuration, the cut edge of the plate material formed by the punch advances continuously and smoothly by the continuous and gradual shearing action of the first to fourth cutting blades. The impact is dispersed and the vibration applied to the actuator or the fingers of the worker is reduced.

In a preferred embodiment of the present invention, the third cutting edge and the fourth cutting edge are arranged symmetrically with respect to the axis of the punch. More preferably, the foremost end face forms a plane orthogonal to the axis of the punch, and the third and fourth cutting edges are flat and form a predetermined angle with the plane of the foremost end face. It is formed by a front end surface and an outer peripheral surface of the tip portion.

[0007]

【Example】

 Hereinafter, preferred embodiments of a punch punch according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a vertical sectional view of a hydraulically-operated puncher having a punch according to an embodiment of the present invention. As shown in FIG. 1, the puncher 1 includes a portable handle 2, an electric motor 3 supported by the portable handle 2, a pump section 4 connected to the electric motor 3, a pump section 4, and a hydraulic operating mechanism. The hydraulic cylinder portion 5 and the jaw type head or jaw 6 extending forward from the hydraulic cylinder portion 5 are substantially configured. The portable handle 2 includes a trigger switch 21 for manually controlling the operation of the electric motor 3 and a grip portion 22 held by an operator with his / her fingers. The electric motor 3 includes an output shaft 30 extending into the pump portion 4, and the output shaft 30 has a cam shaft 31 at its front end portion. The central axis of the cam shaft 31 is slightly eccentric with respect to the rotation axis of the output shaft 30. A needle bearing 32 is arranged concentrically with the cam shaft 31 on the outer periphery of the cam shaft 31.

A housing 40 of the pump portion 4 is connected to the electric motor 3, and an oil tank 42 for containing hydraulic oil is formed in the pump housing 40. A supply port 48 penetrating the housing 40 is formed above the oil tank 42, and a plug 49 is screwed into the supply port 48. The pump piston 41 that constitutes each pump unit 4 a of the pump unit 4 is in sliding contact with the outer peripheral surface of the needle bearing 32. The pump piston 41 is constantly urged upward by the spring 44 in the figure, that is, toward the needle bearing 32. An oil passage 43 communicating with the oil tank 42 is arranged adjacent to the lower end portion of the pump piston 41, and an opening / closing valve 45 is arranged in an oil passage 47 between the pump portion 4 and the hydraulic cylinder device 5. It The on-off valve 45 is biased toward the pump piston 41 by the spring 46, and normally closes the oil passage 47. The hydraulic cylinder device 5 includes a cylinder case 50, a piston 51 reciprocally arranged in the cylinder case, and hydraulic chambers 52 and 53 defined on both sides of the piston 51, respectively. The hydraulic chamber 52 can communicate with the oil passage 47 and can communicate with the release oil passage 54 when the release valve device 55 is opened. The release valve device 55 is opened when the piston 51 moves forward by a predetermined distance, and connects the hydraulic chamber 52 and the release oil passage 54. As a result, the hydraulic oil in the hydraulic chamber 52 is returned to the oil tank 42 via the release oil passage 54.

Further, an oil storage device is provided in the auxiliary handle 2a for absorbing or supplementing excess hydraulic oil or insufficient hydraulic oil caused by a difference in volume change rate between the hydraulic chamber 52 and the hydraulic chamber 53. The oil storage device includes an oil storage chamber 55a that communicates with the hydraulic chamber 53 via an oil passage 56, and an air chamber 55b that is separated from the oil storage chamber 55a by a flexible film 55c. The air chamber 55b is open to the atmosphere. A return spring 57 that biases the piston 51 rearward and a piston rod 58 that extends forward from the piston 51 are arranged in the hydraulic chamber 53. The return spring 57 always holds the piston 51 at the most retracted position. Further, the piston rod 58 penetrates the hydraulic chamber 53 and the cylinder connecting portion 60 of the jaw 6 that defines the front end of the hydraulic chamber 53, and the punch 10 is fixed by the fixing bolt 19 to the piston rod 58. It is fixed to the front end of 58. The jaw 6 extends downward from the cylinder connecting portion 60 and extends forward in a substantially hook shape. A support guide 8 for supporting the lower surface of the plate material W is arranged in the middle portion of the jaw 6, and a fixed die 7 is fixed to the front end portion of the jaw 6. The fixed die 7 is positioned so as to face the punch 10, and when the punch 10 is advanced, the fixed die 7 cooperates with the punch 10 to insert a plate material inserted between the punch 10 and the fixed die 7. W (shown by an imaginary line) is perforated.

Next, the operation of the puncher 1 will be described. The puncher 1 is started by pulling the trigger switch 21 of the portable handle 2 with a finger. The electric motor 3 is operated and the output shaft 30 and the cam shaft 31 are rotated. The needle bearing 32 located on the outer periphery of the cam shaft 31 rolls to reciprocate the pump piston 41 which is in sliding contact with the outer periphery of the needle bearing 32. Thus, the pump unit 4 feeds the hydraulic oil of a predetermined pressure to the hydraulic chamber 52 of the hydraulic cylinder device 5. With the increase in pressure in the hydraulic chamber 52, the piston 51 is moved forward (to the left in FIG. 1) while resisting the elastic force of the return spring 57. As a result, the piston rod 58 and the punch 10 are moved forward, and the punch 10 cooperates with the fixed die 7 to punch the plate W. When the piston 51 is advanced a predetermined distance, the release valve device 55 is opened and the hydraulic chamber 52 communicates with the release oil passage 54. The hydraulic oil in the hydraulic chamber 52 flows back to the oil tank 42 via the release oil passage 54, and the piston 51 is retracted to the initial position shown in FIG. 1 by the return spring 57, thereby closing the release valve device 55.

Since the basic structure and operation mode of such a puncher are disclosed in detail in the above-mentioned Japanese Patent Laid-Open No. 189902/1990, further detailed description will be omitted by quoting the publication. 2A to 2C are a plan view, a side view and a bottom view showing the shape of the punch 10 according to the embodiment of the present invention, respectively. 3 (A) and 3 (B) are a front view and a rear view of the punch 10 shown in FIG. 2, respectively. The punch 10 includes a cylindrical base portion 11 inserted into the front end portion of the piston rod 53, and a cylindrical tip portion 12 having a diameter larger than that of the base portion 11. The base 11 is formed with recesses 13, 13 that engage with the fixing bolt 19. In addition, the tip portion 12 includes first and second cutting blades 20, 20 formed at both longitudinal end portions of the frontmost end surface 16 and a clockwise direction (FIG. (A)) and the 3rd and 4th cutting blades 14 and 14 are provided. The cutting edge 14 is formed by a peripheral edge that is perpendicular to the outer peripheral surface of the tip portion 12. As shown in FIG. 2B, a flat front end face 15 extending inward in the radial direction from the cutting edge 14 is formed at the front end portion of the tip end portion 12, and the front end face 15 projects forward from the central region of the front end face 15. The protruding portion 19 is formed. The protruding portion 19 includes an inclined surface 18 that forms an obtuse angle with the front end surface 15, and a flat frontmost end surface 16 that forms an obtuse angle with the inclined surface 18. The frontmost end surface 16 extends diametrically over the entire width of the tip portion 12 and forms a flat surface having a predetermined width orthogonal to the axis of the punch 10. A protrusion 17 protruding forward is formed on the shaft center portion of the frontmost end face 16, and the protrusion 17 is used for relative alignment or positioning between the punch 10 and the plate material W.

As shown in FIG. 2A, one end of the third cutting edge 14 located on one side of the protruding portion 19 is aligned with the foremost end face 16 at the position indicated by the symbol a, and the cutting edge is cut off. The other end of the blade 14 intersects with the inclined surface 18 at an intersection b, which is separated from the frontmost end surface 16 by a predetermined distance L rearward, and terminates. As shown in FIG. 2C, one end of the fourth cutting edge 14 located on the other side of the protruding portion 19 is aligned with the foremost end face 16 at the position c, and the other end of the cutting edge 14 is It intersects with the inclined surface 18 at an intersection point d, which is separated from the frontmost end surface 16 by a predetermined distance L rearward. The front end face 15 extending inward in the radial direction from each cutting edge 14 forms a predetermined angle α with the foremost end face 16 between the position a and the intersection point b and between the position c and the intersection point d, respectively. Is tilted. As an example of the distance L and the angle α, the distance L is set to 5 mm, for example, and the angle α is set to 14 degrees, for example. As shown in FIG. 3A, the third and fourth cutting edges 14, 14 extend in the circumferential direction from positions a, c, respectively, and terminate at intersection points b, d. First and second cutting edges 20 and 20 are formed on each edge of the foremost end surface 16 by a peripheral edge that is perpendicular to the outer peripheral surface of the tip portion 12, and the cutting edge 14 is a cutting edge. 20 and positions a and c are continuous. As shown in FIG. 3A, the pair of cutting blades 14, 14 arranged on both sides of the foremost end face 16 are formed symmetrically with respect to the axial center of the punch 10.

The cutting edges 14 and 20 have sufficient sharpness for punching a plate material and durability against damage. When the front end portion of the punch 10 is pressed against the plate material W by the operation of the puncher 1, the first and second cutting blades 20 and 20 formed on the respective edges of the foremost end face 16 are the plate materials. Abut. FIG. 4 is an explanatory diagram showing the progress of the cut of the plate material due to shearing. As the punch 10 advances, the punch 10 initially shears the plate material by the cutting edge 20 of the front end face 16 to form a progressive cut in the plate material as indicated by X. Further advancement of the punch 10 causes the punch 10 to shear the plate material by the third and fourth cutting edges 14, 14 of the front end face 15 to form a progressive cut in the plate material as indicated by the symbol Y. The cut X is continuous with the cut Y at the positions a and c, respectively. The cutting edge Y is continuously and gradually advanced by the cutting edge 14 which is inclined rearward at an angle α. Further, as indicated by an imaginary line arrow Z, strain or bending deformation along the longitudinal edge of the front end face 16 progresses. Such bending deformation converges or disappears as the cutting edges X and Y are advanced by the cutting blades 20 and 14. Thus, according to the punch 10 having the above-described configuration, the cut edge of the plate material formed by the punch 10 is formed by the continuous and gradual shearing action of the first to fourth cutting blades 20 and 14. It progresses continuously and gradually in the circumferential direction from the region of both edges. Further, the strain or bending deformation of the plate material along the longitudinal side edge of the frontmost end face 16 converges or disappears as the cutting edge is advanced by the first to fourth cutting edges. Therefore, due to the continuous and gradual shearing action of the punch 10, the impact at the time of punching is dispersed, and the vibration acting on the puncher 1 and the fingers of the worker is reduced.

The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above embodiments, and various modifications or alterations can be made within the scope of the invention described in the scope of claims for utility model registration. It goes without saying that modifications are possible and those are included in the scope of the present invention. For example, in the above embodiment, the front end surface 15 may be a curved surface, and therefore the cutting edge 14 may extend rearward in a curvilinear manner when viewed from above or below. The cutting edge 14 preferably has an acute angle or a right angle with the outer peripheral surface of the tip portion 12, but has a certain obtuse angle with the outer peripheral surface of the tip portion 12. May be Further, the inclined wall 18 in the above embodiment may be a wall surface extending parallel to the axis of the punch 10, for example, a vertical wall or a horizontal wall.

[0015]

[Effect of device]

 According to the above-mentioned configuration of the present invention, the cut of the plate material is continuously and smoothly advanced by the continuous and gradual shearing action, thereby further dispersing the impact at the time of punching, and applying it to the actuator or the fingers of the worker. A puncher punch is provided which can further reduce the applied vibration.

[Submission date] October 20, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior art]

There is known a portable puncher that includes a fixed die and a punching punch, and punches a workpiece such as a steel plate with a cutting edge of the punch (Japanese Patent Laid-Open No. 58-224029). 3-189022). Such a puncher has a hydraulic actuating mechanism including a hydraulic cylinder as an actuating device for the punch, and the punch is attached to the front end portion of the piston rod of the hydraulic cylinder. The front end surface of the punch is generally formed flat, and a guide pin is provided so as to protrude from the shaft core. The guide pin is used to align the plate and the punch, and is visually aligned with the marking line of the plate immediately before punching. The applicant of the present invention, in such puncher punch, reduces the punching load of the puncher, secures the sharpness of the cutting edge, and has a shape that is difficult for the so-called prying force to exert when punching holes. It has proposed in the use punch Jitsugantaira No. 4─5587 (real-Open 5─ 65424 JP). Puncher punch of a certain type disclosed in the utility model application is shown in Figure 5. In FIG. 5, the punch 110 includes a cutting edge 114 formed on the outer circumference of the front end surface and forming a right angle or an acute angle with the outer circumferential surface 112 of the punch, and a front end surface 115 extending from the cutting edge 114 inward in the radial direction of the punch. , And a protruding portion 119 protruding forward from the front end surface 115. The punch 110 further includes a side wall 118 that extends forward at an angle with respect to the front end face 115, and defines the front edge of the side wall 118, and forms the front end face at a right angle or an obtuse angle with respect to the side wall 118. 116 is provided. Further, a groove 117 for alignment extending from the axis of the punch 110 to the edge of the front end surface 116 is formed in the front end surface 116.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Further, an oil storage device is provided in the auxiliary handle 2a for absorbing or supplementing excess hydraulic oil or insufficient hydraulic oil caused by a difference in volume change rate between the hydraulic chamber 52 and the hydraulic chamber 53. The oil storage device includes an oil storage chamber 55a that communicates with the hydraulic chamber 53 via an oil passage 56, and an air chamber 55b that is separated from the oil storage chamber 55a by a flexible film 55c. The air chamber 55b is open to the atmosphere. A return spring 57 that biases the piston 51 rearward and a piston rod 58 that extends forward from the piston 51 are arranged in the hydraulic chamber 53. The return spring 57 always holds the piston 51 at the most retracted position. Further, the piston rod 58 penetrates the hydraulic chamber 53 and the cylinder connecting portion 60 of the jaw 6 which defines the front end of the hydraulic chamber 53, and the punch 10 is fixed by the fixing bolt 59 to the piston rod 58 . It is fixed to the front end of 58. The jaw 6 extends downward from the cylinder connecting portion 60 and extends forward in a substantially hook shape. A support guide 8 for supporting the lower surface of the plate material W is arranged in the middle portion of the jaw 6, and a fixed die 7 is fixed to the front end portion of the jaw 6. The fixed die 7 is positioned so as to face the punch 10, and when the punch 10 is advanced, the fixed die 7 cooperates with the punch 10 to insert a plate material inserted between the punch 10 and the fixed die 7. W (shown by an imaginary line) is perforated.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Since the basic structure and operating mode of such a puncher are disclosed in detail in Japanese Patent Laid-Open No. 189902/1993, further detailed description will be omitted by quoting the publication. 2A to 2C are a plan view, a side view and a bottom view showing the shape of the punch 10 according to the embodiment of the present invention, respectively. 3 (A) and 3 (B) are a front view and a rear view of the punch 10 shown in FIG. 2, respectively. Punch 10 includes a cylindrical base portion 11 which is inserted into the front end portion of the piston rod 5 8, and a cylindrical distal end portion 12 is larger in diameter than the base portion 11. The base 11 is formed with recesses 13, 13 that engage with the fixing bolts 59 . Further, the tip portion 12 includes first and second cutting blades 20 and 20 formed at both ends in the longitudinal direction of the foremost end surface 16 and a clockwise direction in the circumferential direction rearward from each cutting blade 20 (see FIG. 3). (A)) and the 3rd and 4th cutting blades 14 and 14 are provided. The cutting edge 14 is formed by a peripheral edge that is perpendicular to the outer peripheral surface of the tip portion 12. As shown in FIG. 2B, a flat front end face 15 extending inward in the radial direction from the cutting edge 14 is formed at the front end portion of the tip end portion 12, and the front end face 15 projects forward from the central region of the front end face 15. The protruding portion 19 is formed. The protruding portion 19 includes an inclined surface 18 that forms an obtuse angle with the front end surface 15, and a flat frontmost end surface 16 that forms an obtuse angle with the inclined surface 18. The frontmost end surface 16 extends diametrically over the entire width of the tip portion 12 and forms a flat surface having a predetermined width orthogonal to the axis of the punch 10. A protrusion 17 protruding forward is formed on the shaft center portion of the frontmost end face 16, and the protrusion 17 is used for relative alignment or positioning between the punch 10 and the plate material W.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hydraulically-operated puncher having a punch according to an embodiment of the present invention.

FIG. 2 is a plan view, a side view and a bottom view showing a shape of a punch according to an embodiment of the present invention.

FIG. 3 is a front view and a rear view of the punch shown in FIG.

FIG. 4 is an explanatory diagram showing progress of a cut end of a plate material due to shearing.

FIG. 5 is a plan view, a side view, and a front view showing the shape of a punch according to a conventional technique.

[Explanation of symbols]

 10 Punch 11 Base 12 Tip 14 Cutting Edge (3rd and 4th Cutting Edge) 20 Cutting Edge (1st and 2nd Cutting Edge) 15 Front End Surface 16 Frontmost End Surface 17 Protrusion 18 Inclined Surface

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[Procedure amendment]

[Submission date] October 20, 1994

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (3)

[Scope of utility model registration request] 1. A puncher punch having a cutting edge formed on an outer peripheral portion of a tip portion, the punch having a frontmost end surface (16) extending diametrically to the outer peripheral portion of the tip portion. A first edge and a second cutting edge (20) extending in the circumferential direction over the width of the frontmost front end face are formed by the end edge portion and the outer peripheral surface of the front end portion, respectively, and the first end of the frontmost end face is formed. The first cutting edge (2
0), and a third cutting edge (14) extending in the circumferential direction and rearward from the first cutting edge, and a second cutting edge (20) formed at the second edge portion of the foremost end face. A puncher punch, which further comprises a fourth cutting edge (14) which is continuous and extends rearward from the second cutting edge in the same circumferential direction as the third cutting edge. 2. The punch punch for puncher according to claim 1, wherein the third cutting edge and the fourth cutting edge are arranged symmetrically with respect to an axis of the punch. 3. The foremost end face (16) forms a plane orthogonal to the axis of the punch, and the third and fourth cutting edges (1).
The punch for puncher according to claim 1 or 2, wherein 4) is formed on a peripheral edge of a flat front end face (15) forming a predetermined angle with respect to a plane of the front end face.