JPH0810437Y2 - Puncher punch - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puncher punch, and more specifically, a puncher attached to the front end portion of a reciprocating rod, which cooperates with a fixed die to punch a workpiece. It is about punches for use.

[0002]

2. Description of the Related Art There is known a portable puncher having a fixed die and a punch for punching, which punches a workpiece such as a steel plate by a cutting edge of the punch (Japanese Patent Laid-Open No. Sho 5).
8-224029, etc.). Such a puncher has a hydraulic actuation 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.

In such puncher punches,
A brim that extends radially outward from the shaft is formed integrally
Punches with brims are put to practical use (eg
No. 4-47822, etc.). Use a lathe to punch
By cutting (or integral molding by special molding method)
Manufactured by cutting the punch shaft part
Integral machining or integral with shaft when machining or molding
Shaped. From the manufacturing method of such a punch with a brim
As you can see, the brim part of the punch with brim is the axis of the punch
It is physically and structurally inseparable from the department, in other words
For example, the brim of the punch should be integrated with the tip and base of the punch.
It is formed. The structure of such a conventional punch with a brim
An example is shown in FIG. As shown in FIG. 4, the piston rod P
The front end has a hole A for accommodating the base of the punch (rear end).
Is punched, and the base of the punch is inserted into the hole A. Tsu
The bar C is formed integrally between the base and the tip of the punch.
And the spigot structure formed on the front end face F of the piston rod.
A spigot structure portion I1 complementary to the manufacturing portion 12 is provided.
As shown in FIG. 4 (B), the length H1 of the base is equal to the depth of the hole A.
It is set smaller than H2, and the base of the punch is a hole.
When inserted into the section A, the back surface (rear side surface) E of the brim C is
The front end face F of the stone rod P is contacted with the rear end face D of the base portion.
It is separated from the bottom surface B of the hole portion A. In addition, the spigot structure part I
1, I2 are engaged with each other, and with respect to the piston rod P
Position the punch C angular position. Such a known structure
With a punch with a brim, the compressive stress during drilling is
Is transmitted to the front end face F of the piston rod via the bar C
The end face F supports the reaction force during drilling. Further, the applicant of the present invention has proposed such a well-known punch having a brim, which is provided with a guide pin movably arranged on the axial center portion of the punch (Japanese Patent Laid-Open No. 3-18902).
No. 2). This guide pin greatly protrudes from the front end surface of the punch by the elastic force of the compression spring, facilitates the alignment between the plate and the punch, and is pushed by the plate during punching and retracted into the punch, and punching by the punch is performed. To enable. In addition, the guide pin can be separated from the punch and facilitates the polishing work of the cutting edge formed on the outer periphery of the punch, which is extremely advantageous in practical use. A punch of this structure is shown schematically in FIG.

As shown in FIG. 3, in the punch having the above structure,
A spring retainer R that engages with the compression spring S must be provided at the rear end of the guide pin G, and a movement space for reciprocating the spring retainer R must be secured in the rear region of the punch. Therefore, the front end of the piston rod P is provided with a hole A for accommodating the rear end of the punch, and the brim C formed on the outer peripheral surface of the punch is engaged with the front end face F of the piston rod. . With this type of brim punch
Also , the compressive stress at the time of drilling is transmitted to the front end face F of the piston rod via the brim C, and the front end face F supports the reaction force at the time of drilling. Therefore, by engaging the brim C and the front end face F, it is possible to maintain the positional relationship between the punch and the piston rod, and by maintaining this positional relationship, the punch rear end surface E and the bottom wall B of the hole A are retained. It is possible to secure a space for allowing the spring retainer R to reciprocate between.

[0005]

The conventional punch brim has a so-called spigot and has the following two functions.
It (I) The collar uses the stress of the piston rod during drilling.
Transmit to the front end face. (Ii) The brim has a so-called spigot (positioning means).
And engages with the front end of the piston rod by the spigot connection
Set the angular position of the punch with respect to the piston rod.
It

However, in the above structure, a large bending stress is applied to the brim C, so that the thickness T of the brim must be set to be considerably large in order to surely prevent the brim from being deformed or broken. Increasing the thickness T of the brim increases the total length of the puncher, resulting in a significant increase in the weight of the puncher. Further, in a portable puncher that places importance on downsizing and weight reduction, the stroke length is limited, and an increase in the thickness of the brim leads to a reduction in the permissible punchable plate thickness. Therefore, there is a situation in which it is difficult to increase the thickness of the brim carelessly.

The present invention has been made in view of the above point, and an object of the present invention is to increase the thickness of the brim engaging with the front end face of the piston rod without increasing the brim.
It is intended to provide a puncher punch capable of preventing deformation or breakage of the punch and sufficiently transmitting the stress acting on the punch during drilling to the piston rod.

[0008]

As a result of earnest studies to achieve the above-mentioned object, the present inventor has found that the collar of the punch has a so-called spigot, and originally, the angular position of the punch with respect to the piston rod. The present invention has been accomplished based on the idea that the brim can perform its original function if it has the minimum thickness necessary to provide the spigot. . That is, the present invention is mounted to the front end portion of the reciprocating rod, in cooperation with the stationary die a puncher punch subjected to drilling in the workpiece, the punch has an opening on the front end surface of the rod A base portion to be inserted into the hole, a tip portion connected to the base portion, and a connection portion between the tip portion and the base portion,
And a flange having a larger diameter than the base portion, said flange, said distal end portion and is formed in the base and integrally flanged for puncher to have a positioning means for setting the angular position of the punch relative to the rod Scent of punch
Te, As stress during punching does not act on substantially the flange, the rear end face of the base portion abuts the bottom of the hole,
The punch for puncher is characterized in that an axial length of the base is larger than a depth of the hole, and a gap is formed between a rear end surface of the brim and a front end surface of the rod. The collar positioning means is a so-called
To make a low joint,
Insert the tool so that it corresponds to the spigot structure provided on the tip.
It means the spigot structure part provided in the bar.

According to the above configuration of the present invention, the brim is positioned
Equipped with a deciding means (inlay), the function of (ii) above
A machine for setting the angular position of the punch with respect to the piston rod
Fulfills Noh. Moreover, since a gap is formed between the brim and the front end face of the reciprocating rod, the compressive stress acting on the punch during punching is transmitted to the bottom face of the hole of the reciprocating rod via the rear end face of the base portion. Therefore, compressive stress or bending stress does not substantially act on the brim. In a preferred embodiment of the present invention, a bore opening toward the bottom surface of the hole is formed in the shaft core portion of the base portion, an axial through hole is formed in the shaft core portion of the tip portion, and the tip portion is formed. A guide pin protruding from the front end surface of the guide pin is inserted into the through hole, the rear end of the guide pin is located in the bore, and the compression spring is interposed between the rear end of the guide pin and the bottom surface of the hole. To be done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a punch punch according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a vertical cross-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 portion 4 connected to the electric motor 3, a pump portion 4, and a hydraulic pressure. The hydraulic cylinder portion 5 that constitutes an actuating mechanism and a jaw-shaped head or a jaw 6 that extends 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 a worker with his / her fingers.

The electric motor 3 has 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 the output shaft 30.
Is slightly eccentric with respect to the axis of rotation of. A needle bearing 32 is arranged on the outer periphery of the cam shaft 31 concentrically with the cam shaft 31. The housing 40 of the pump unit 4 is connected to the electric motor 3, and an oil tank 42 for containing hydraulic oil is formed in the pump housing 40. Oil tank 42
A replenishment port 48 penetrating the housing 40 is formed on the above, and a plug 49 is screwed into the replenishment 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 always moved upward by the spring 44 in the figure, that is, the needle bearing 32.
Is being biased toward. Oil passage 4 communicating with the oil tank 42
3 is arranged adjacent to the lower end of the pump piston 41,
Further, the on-off valve 45 has the pump unit 4 and the hydraulic cylinder device 5.
It is arranged in the oil passage 47 between and. 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 5
0, 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 has an oil passage 47.
And when the release valve device 55 is opened,
It can communicate with the release oil passage 54. 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 released into the release oil passage 5
The oil is returned to the oil tank 42 via 4.

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 the difference in volume change rate between the hydraulic chamber 52 and the hydraulic chamber 53. The oil system 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.

In the hydraulic chamber 53, a return spring 57 for urging the piston 51 rearward and a piston rod 58 extending forward from the piston 51 are arranged. The return spring 57 always holds the piston 51 in the most retracted position. Also, 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 to the front end portion of the piston rod 58 by the fixing bolt 19. It

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 W (virtual) inserted between the punch 10 and the fixed die 7. Drilled).

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 fingers. The electric motor 3 is operated and the output shaft 30 and the cam shaft 31 are rotated. Needle bearing 3 located on the outer periphery of the cam shaft 31
2 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.

As the pressure in the hydraulic chamber 52 increases, 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 advanced, and the punch 10
Collaborates with the fixed die 7 to make a hole in the plate material W. When the piston 51 is moved forward by a predetermined distance, the release valve device 55 is opened, and the hydraulic chamber 52 moves to the release oil passage 5
Communicate with 4. The hydraulic oil in the hydraulic chamber 52 is released through the release oil passage 5.
4, the oil is returned to the oil tank 42, and the piston 51 is retracted by the return spring 57 to the initial position shown in FIG.
As a result, the release valve device 55 is closed.

Since the basic structure and operating mode of such a puncher are disclosed in detail in the above-mentioned Japanese Patent Laid-Open No. 189902/1993, further detailed description will be omitted by quoting the publication. FIG. 2 is a vertical sectional view showing a mounting structure of the punch 10. Punch 10
Includes a cylindrical base portion 11, a cylindrical tip portion 12 having substantially the same diameter as the base portion 11, and a guide pin 16 reciprocally supported by the tip portion 12.

A circular hole 58a having an inner diameter substantially the same as the outer diameter of the base 11 is formed in the front end portion of the piston rod 53. The base 11 is inserted into the circular hole 58a, and the rear end surface of the base 11 is in contact with the bottom surface of the circular hole 58a.
The recess 13 formed in the upper portion of the base 11 is fixed to the fixing bolt 19
The fixing bolt 19 prevents the punch 10 from falling out of the circular hole 58a. The base 11 also comprises a circular bore 14 opening at the rear end face, in which the spring 15 is arranged. The spring 15
It is held in compression by the rear end flange 17 of the guide pin 16 and the flat bottom surface of the circular bore 58a.

The tip 12 has a through hole 18 for guiding the guide pin 16. The through hole 18 penetrates the axial center of the punch 10 and extends from the front end surface of the tip portion 12 to the bottom surface of the circular bore 14. The through hole 18 has an inner diameter substantially the same as the outer diameter of the guide pin 16, and is in sliding contact with the outer peripheral surface of the guide pin 16. The guide pin 16 is for aligning the plate material W and the punch 10, and when using, the guide pin 1
The pointed tip of 6 is aligned with the marking line K of the plate W.
The outer peripheral surface of the tip portion 12 is perpendicular to the front end surface of the tip portion 12, and a cutting edge 10a is formed on the outer periphery of the front end surface of the tip portion 12. The tip 12 is pressed against the plate W by the extension of the piston rod 58, and punches the plate W along the contour of the cutting blade 10a.

An annular brim 100 having a larger diameter than the base 11 is formed integrally with the tip 12. The brim 100 is provided with a so-called spigot (not shown) that enables positioning when the punch 10 is attached. Therefore, the brim 100 is arranged at the root of the tip 12, that is, at the connection with the base 11. The length of the base portion 11 in the axial direction is larger than the depth of the circular hole 58a of the piston rod 58, so that a gap g is formed between the rear end surface 101 of the collar 100 and the front end surface 58b of the piston rod 58.
The gap g is preferably set to 0.5 mm or less.

According to such a mounting structure, since the rear end surface of the base portion 11 is in contact with the bottom surface of the circular hole 58a of the piston rod 58, the compressive stress acting on the punch 10 during the punching process passes through the rear end surface of the base portion 11. Is transmitted to the bottom surface of the circular hole 58a. On the other hand, since the gap g is formed between the brim 100 and the front end surface of the piston 58, this compressive stress does not act between the rear end surface 101 of the brim 100 and the front end surface 58b of the piston rod 58. Therefore, the brim 100
In designing the thickness of the brim 100, the compressive stress and the bending stress due to the punching reaction force can be substantially ignored, so that the thickness of the brim 100 can be set small.

As described above, the punch 10 includes the base portion 11 inserted into the circular hole 58a of the piston rod 58 and the brim 100 having a diameter larger than that of the base portion 11. The rear end surface of the base portion 11 has the circular hole 58a. Abut on the bottom, and the brim 1
00 rear end face 101 and piston rod 58 front end face 58
A gap g is formed with b. Plate material W during punching
The reaction force acting on the punch 10 is transmitted to the bottom surface of the circular hole 58a via the rear end surface of the base 11, and the compressive stress or the bending stress does not substantially act on the brim 100. Therefore, the thickness of the brim 100 can be set to be small, and thus the stroke length of the piston rod 58 can be set to be small. Thus, the mounting structure of the punch 10 is extremely advantageous for a portable small-sized puncher that attaches importance to shortening the overall length and reducing the weight, and has a great practical effect.

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 changes can be made within the scope of the invention described in the scope of claims for utility model registration. It goes without saying that they are possible and are included within the scope of the present invention. For example, the present invention may be applied to a punch that does not include the guide pin.

[0026]

According to the above construction of the present invention, the stress during punching which acts on the punch is sufficiently transmitted to the piston rod without increasing the thickness of the brim engaging with the front end face of the piston rod. A punch for punching can be provided. In such a punch, the brim is not likely to be deformed or broken due to the stress at the time of drilling. Therefore, the thickness of the brim is set to be small, whereby the stroke length of the piston rod can be reduced. Therefore, according to the present invention, it is possible to reduce the overall length and weight of the puncher while preventing the brim from being deformed or broken, which is extremely advantageous especially for a portable puncher.

[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 vertical sectional view showing a mounting structure of the punch shown in FIG.

FIG. 3 is a vertical sectional view showing a punch according to the related art.

FIG. 4 is a perspective view and a vertical sectional view showing the structure of a known punch with a brim.

[Explanation of symbols]

 10 Punch 11 Base 12 Tip 13 Cavity 14 Circular Bore 15 Spring 16 Guide Pin 17 Flange 18 Through Hole 19 Fixing Bolt 58 Piston Rod 58a Circular Hole 58b Front End Face 100 Flange 101 Rear End Face

Claims (2)

[Scope of utility model registration request] 1. A reciprocating rod mounted on a front end portion of the reciprocating rod,
Fixed die cooperating with a puncher punch subjected to drilling in the workpiece, the punch includes a base portion that is inserted into a hole that opens to the front end surface of the rod, the tip connected to the base portion And a brim having a diameter larger than that of the base, the brim being disposed at a connecting portion between the tip and the base , the brim being integrally formed with the tip and the base, and an angle of the punch with respect to the rod. Contact the brim with punch for puncher to have a positioning means for setting the position
There, as stress at punching does not act on substantially the flange, the rear end face of the base portion abuts the bottom of the hole, the axial length of the base is greater than the depth of the hole, A puncher punch, wherein a gap is formed between a rear end surface of the brim and a front end surface of the rod. 2. A bore that opens toward the bottom surface of the hole is formed in the shaft core portion of the base portion, an axial through hole is formed in the shaft core of the tip portion, and protrudes from the front end surface of the tip portion. The guide pin is inserted into the through hole, the rear end of the guide pin is located in the bore, and the compression spring is interposed between the rear end of the guide pin and the bottom surface of the hole. The punch punch for punching according to claim 1.