JPH08294737A - Die and punch guide of punching machine - Google Patents

Abstract

PURPOSE: To provide the die of punching machine which prevents generation of burrs on a hole edge by forming an annular recessed part on the hole edge on the lower side of a work by a projecting part for recessing the work provided on a hole edge part of a die simultaneously with the drilling of the work. CONSTITUTION: A punch guide 3 and a die 7 are fitted to a supporting body 18 and a base plate 13 respectively. A work 10 is loaded on a table, and a punching machine is started. When the prescribed position of the work 10 is moved on the die 7, a movable body 14 is lowered. An auxiliary spring 24 is contracted, and the tip of the punch guide 3 is brought into contact with the die 7. When the movable body 14 is further lowered, a body tip part 1a is brought into contact with the work 10, and a projecting part 9 for recessing the work of the punch guide 3 is pressed against the work 10 to start the plastic deformation. When a punch body 1 is further lowered, a hole 20 is drilled by the body tip part 1a, and an upper recessed part and a lower recessed part are formed on a hole edge part of the hole 20 by the pressing force of the punch guide 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent burrs from being formed on a perforated edge when a circular hole or a rectangular hole is mainly bored in a metal plate by a punching machine. Further, the present invention relates to a metal plate formed so that when a screw hole is formed on the inner surface of the circular hole, burrs generated when the screw hole is formed do not protrude from the surface of the metal plate.

[0002]

2. Description of the Related Art When a rectangular hole is formed in a metal plate by a punching machine, a slight burr may occur on the die side, and the deburring work may be necessary. Also, when a circular hole is drilled, even if burr does not substantially occur at the hole edge, if a tapped hole is formed in the hole, the tapped edge will be processed at the upper and lower edges of the hole. A slight burr occurs. Then, since the burr slightly protrudes from the upper surface of the metal plate, it is necessary to remove the burr.

[0003]

However, the conventional punching machine assembly has a drawback in that the number of man-hours for deburring increases. Therefore, the present invention provides a die and a punch guide for a punching machine having a structure in which burrs are generated when a square hole is drilled without increasing the number of working steps, and burrs generated during screw hole formation do not project from the hole edge to the metal plate surface. For the purpose of providing, the following configuration is adopted to achieve the purpose.

[0004]

DISCLOSURE OF THE INVENTION A die of a punching machine according to the present invention comprises a punch body 1 and an intermediate portion of the punch body 1 so that a lower end of the punch body 1 can freely move in and out of a bottom center hole 2. A cylindrical punch guide 3 to be fitted into the punch body 1, an elastic body 5 provided between the punch head 4 provided at the upper end of the punch body 1 and the punch guide 3, and a tip of the punch body 1. A die 7 having an upper end center hole 6 through which the punch guide 3 freely enters and exits, and the punch guide 3 is supported by a punching machine in a vertically movable manner. An annular work concave projection 8 is formed at the hole edge of the hole 6, and an axis added to the punch guide 3 when the punch head 4 is moved downward against the biasing force of the elastic body 5. By direction of the external force is applied to the workpiece, the workpiece recessed convex portion 8 of the die 7 is characterized in that which is configured to form an annular recess in the hole edge of the perforation of the workpiece.

Further, the punch guide of the punching machine of the present invention is fitted in the punch body 1 and below the middle portion of the punch body 1 so that the lower end of the punch body 1 can be inserted into and removed from the bottom center hole 2. A cylindrical punch guide 3, an elastic body 5 interposed between the punch head 4 provided at the upper end of the punch body 1 and the punch guide 3, and the tip of the punch body 1 can freely move in and out. A punching machine die 7 having an upper end center hole 6 entering the
In the punch guide 3 of the punching assembly in which the punch guide 3 is supported by a punching machine so as to be movable up and down, an annular work recess convex portion is formed at the hole edge of the bottom center hole 2 of the punch guide 3. 9 is formed, and when the punch head 4 is moved downward against the urging force of the elastic body 5, an axial external force applied to the punch guide 3 is applied to the work, so that the work of the punch guide 3 is formed. It is characterized in that the concave convex portion 9 is configured to form an annular concave portion at the hole edge of the perforation of the work.

[0006]

According to the die and the punch guide of the punching machine of the present invention, the work guide concave portion 9 is formed on the punch guide 3 and the work concave portion 8 is formed on the die 7. The punch head 4 is moved to the movable body 14
When pressed downward with, the work recessing projection 9 of the punch guide 3 is pressed against the upper surface of the work 10 by the biasing force of the elastic body 5, and the work recessing projection 8 of the die 7 is moved toward the lower surface of the work 10. Pressed. Then, due to the pressing force, at the same time as punching by the punch body 1, an upper surface recessed portion 11 and a lower surface recessed portion 12 are formed at the edge of the hole as shown in FIG. Due to their existence, when the inner screw 19 is formed on the inner surface of the perforation 20 as shown in FIG. 6, the burrs 21 generated at the upper edge portion and the lower edge portion are
It does not protrude from the outer surface of the work 10. Therefore, deburring work is unnecessary. Moreover, by using both the die and the punch guide of the present invention, the work of forming the perforations 20, the upper surface recessed portions 11 and the lower surface recessed portions 12 can be simultaneously processed during punching.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a main part in which the punching assembly of the present invention is attached to a punching machine, FIG. 2 is an enlarged view of a II portion of FIG. 1, and FIG. 3 is an enlarged view of a III portion thereof. Further, FIG. 4 is an explanatory view showing a usage state of the present invention, and FIG.
Shows the state of perforation of the work 10 formed by the die and punching guide of the present invention, and FIG.
It is explanatory drawing of the state which formed 19. Further, FIG. 7 is an explanatory view sequentially showing the steps of forming the internal screw 19 on the inner surface of the hole by the die and the punching guide of the present invention and then bending the vicinity thereof. The assembly of the punching machine of the present invention has a punch body 1, a punch guide 3, an elastic body 5 and a die 7, as shown in FIG. These component configurations are well known except for the following parts. That is, what is different from the conventional configuration is the work concave projection 9 formed on the lower end surface of the punch guide 3 and its peripheral portion, and the work concave projection 8 formed on the upper end surface of the die 7. The punch body 1 has a punch head 4 and a flange portion 15 at the upper end, and the body tip portion 1a is formed in a rod shape having a desired outer diameter. The outer diameter between the body tip portion 1a and the upper end portion is enormous. ing.

The intermediate portion and below are fitted into the punch guide 3, and the body tip portion 1a is inserted into the center hole 2 of the bottom portion of the punch guide 3 so as to be freely inserted and removed. A flange portion 16 is provided on the upper end of the punch guide 3, and an elastic body 5 composed of a coil spring is arranged between the flange portion 16 and the flange portion 15 of the punch body 1 in the embodiment of this drawing. . Cylindrical urethane rubber may be used instead of the coil spring. The use of urethane rubber is rather preferable in the present invention because its elastic force is evenly applied to the flange portion 16 of the punch guide 3. The punch guide 3 is inserted in and out of a hole of a support 18 provided in the punching machine. Then, the bolt 22 is screwed and fastened to the hole edge portion of the hole, the washer 23 is attached to the head portion thereof, and the washer 23
An auxiliary spring 24 is provided between the upper surface of the support 18 and the upper surface of the support 18. Then, the washer 23 contacts the lower surface of the flange portion 16 of the punch guide 3. The elastic force of the auxiliary spring 24 is significantly weaker than that of the elastic body 5 of FIG. The auxiliary spring 24 and the elastic body 5 are both compression springs, and are urged so that their length extends in the axial direction. Next, the die 7 is mounted on the substrate 13 of the punching machine.

Here, the feature of the present invention is that the work concave portion 9 formed on the lower end surface of the punch guide 3 and its peripheral portion and the upper end surface of the die 7 are formed as described above. The convex portion 8 for recessing the work. These are shown in Figure 2.
And as shown in FIG. That is, punch guide 3
A bottom center hole 2 is formed in the lower end surface of the body 2, and a body tip portion 1a is vertically movably inserted therethrough. The hole edge of the bottom center hole 2 is formed into a tapered annular taper, which constitutes the work recessed projection 9. The width of the work recessed convex portion 9 formed in an annular shape is, for example, smaller than the radius of the bottom center hole 2. The material of the die 7 and the punch guide 3 is high speed steel (SKH51 type improved steel).
Other tool steels are used. Further, in this embodiment, as shown in FIGS. 1 and 2, a trapezoidal portion 25 having a diameter not more than half the outer diameter of the punch guide 3 is formed in an annular shape in the vicinity of the bottom center hole 2 in the tip portion of the punch guide 3. The bottom of the convex portion 9 for recessing the work has a shape led to the trapezoidal portion 25. The trapezoidal portion 25 serves to intensively apply the pressing force of the punch guide 3 to the work 10.

Next, the punch guide 3 and the die 7 of the present invention.
How to use is explained. First, as shown in FIG. 1, the punch guide 3 and the die 7 of the present invention are attached to the support 18 and the substrate 13. Then, the work 10 is placed on the table and the punching machine is started. When the specific position of the work 10 moves onto the die 7, the movable body 14 descends. Then, the auxiliary spring 24 contracts and the tip of the punch guide 3 comes into contact with the die 7. Then, when the movable body 14 is further lowered, the tip portion 1a of the body comes into contact with the work 10 and the work recessed convex portion 9 of the punch guide 3 is pressed against the work 10 to start plastic deformation. Further, when the punch body 1 is lowered, the perforations 20 are perforated by the body tip portion 1a, and the pressing force of the punch guide 3 forms the upper surface recessed portion 11 and the lower surface recessed portion 12 at the hole edge portion of the perforation 20. Therefore, if an internal screw is formed in the hole 20 of FIG.
As described above, the burrs 21 are slightly projected at the upper and lower edges of the inner screw 19. However, the upper surface concave portion 11 is previously formed at the hole edge.
Further, since the lower surface recessed portion 12 is formed, the burr 21 does not project to the surface of the work 10.

Next, FIGS. 7 and 8 are explanatory views when the work 10 is bent in the vicinity of the inner screw 19. Usually, in such a case, a perforation and an internal screw are formed after bending. This is because if they are formed first, the screw holes will be deformed by bending. However, according to such a method, there is a drawback that mass productivity is lacking. Therefore, when the punch guide 3 and the die 7 of the present invention are used, punching is performed using them to form the upper surface concave portion 11 and the lower surface concave portion 12 at the edge of the hole, and the hole is formed. A rectangular hole 26 for a bending guide is formed in the vicinity of the above in advance.
Then, while the work 10 is flat, the inner screw 19 is formed on the inner surface of the hole, and then the work is performed by the bender with the rectangular hole 26 as a boundary.
Just fold 10. By doing so, it is possible to prevent the inner surface of the hole and the inner screw 19 from being deformed due to bending, and it is also possible to prevent the burr generated when the inner screw 19 is formed from jumping out to the surface of the work 10. In the above-described embodiment, the work recessing projections 8 and 9 are provided on both the punch guide 3 and the die 7, but the work recessing projections may be provided on only one of them. For the deburring of the work surface, there is an application in which only one surface is sufficient. In that case, it is sufficient to provide the work recessed convex portion on only one part of the required punching assembly.

Next, FIG. 9 is a longitudinal sectional view of another embodiment of the punch guide 3 of the present invention. The difference between this embodiment and the above embodiment is that the punch guide 3 has a guide upper portion 3a and a guide lower portion 3b. The guide lower portion 3b is made of a tool steel material having a high hardness, and the guide upper portion 3a is made of a steel material having a relatively low hardness. Then, the work concave portion 9 is formed at the hole edge portion of the bottom center hole 2 of the lower guide portion 3b.
Is provided. Further, the upper guide portion 3a and the lower guide portion 3b are detachably fastened and fixed via bolts 3c. With such a configuration, the tool steel material can be provided in the minimum necessary amount, and the entire punch guide can be provided at low cost. At the same time, by exchanging only the guide lower portion 3b where the work concave portion 9 exists, punch assemblies of various diameters can be constructed.

Next, FIGS. 10 and 11 show another embodiment of the punch guide 3 and the die 7 of the present invention. In this embodiment, the end faces of the punch guide 3 and the die 7 are provided with annular grooves 3e, respectively.
7e is formed, the cyclic urethane rubbers 3d and 7d are fitted therein, and a part of the annular urethane rubber 3d projects from each end face. These cyclic urethane rubbers 3d and 7d are used when the work 10 is punched.
This facilitates the separation of the punch guide 3, the punch guide 3 and the die 7. In the present invention, since the tapered concave portions 8 and 9 for the work are particularly provided, the work 10 and the end face of the punch guide 3 or the end face of the die 7 stick to each other at the time of punching, and it may be difficult to separate them after punching. Therefore, the cyclic urethane rubbers 3d and 7d are forcibly separated from each other by the elastic action. At this time, the elastically deformed annular urethane rubber 3 is attached to the semicircular cross section of the bottoms of the annular grooves 3e, 7e.
A part of d, 7d enters and facilitates its elastic deformation.
In addition, you may arrange | position a metal ring in the part which contacts a workpiece | work. Thereby, wear of the cyclic urethane rubbers 3d and 7d can be prevented.

Next, FIG. 12 shows another embodiment of the elastic body 5 interposed between the punch guide 3 and the punch body 1 of the present invention. The elastic body 5 is a so-called gas spring, and the compressed gas 28 is enclosed between the cylinder 27 and the piston 30, and the volume of the sealed gas 28 is changed as the piston 30 expands and contracts. The effect of the gas pressure causes a spring effect. An O-ring 31 for sealing compressed gas is provided at the sliding portion between the piston 30 and the cylinder 27.

Next, FIG. 13 shows another embodiment of the die of the present invention, and FIG. 14 is a vertical sectional view of the punching assembly taken along the line AA of FIG. The tip portion of the punch body 1 of this embodiment has a rectangular cross section, and accordingly, the bottom center hole 2 of the plate 3f attached to the bottom of the punch guide 3 and the top center hole 6 of the die 7 are each formed in a square shape. Has been done. An annular work concave projection 8 is formed on the edge of the upper end center hole 6. Further, a work separating body 33 is embedded in the surface of the die 7 so as to be able to move in and out, and is biased by a spring 34 in a direction projecting from the surface of the die 7.

[0016]

According to the die of the punching machine of the present invention, the work concave portion 8 provided at the hole edge portion of the die forms an annular concave portion on the lower surface side hole edge of the work at the same time when the work is punched. Since it is formed, no burr is generated at the hole edge. Furthermore, when a screw hole is formed on the inner surface of a circular hole, there is no possibility that burrs generated due to the formation of the screw hole will protrude to the outer surface of the work. Moreover, since the annular recess is formed at the same time as the drilling, the number of working steps does not increase. Moreover, in the punch guide of the punching machine of the present invention, since the work concave portion 9 is formed at the hole edge of the bottom center hole 2 of the punch guide 3, the hole is formed at the same time as the punching on the upper surface side of the work. An annular upper surface recessed portion 11 is formed at the edge. Therefore, there is no possibility that a burr when forming a screw hole on the inner surface of the hole will project upward from the work upper surface.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a punching machine using a punch guide 3 and a die 7 of the present invention.

FIG. 2 is an enlarged view of part II in FIG.

FIG. 3 is an enlarged view of part III in FIG. 1.

FIG. 4 is a vertical cross-sectional view of a main part showing a usage state of a punch guide 3 and a die 7 of the present invention.

FIG. 5: Punching by the punch guide 3 and the die 7 of the present invention
20 hole edges are shown.

6 is an explanatory view showing a state in which an inner screw 19 is formed on the inner surface of the hole of FIG.

FIG. 7 is a first step showing a usage application example of the punch guide 3 and the die 7 of the present invention.

FIG. 8 is the same second step.

FIG. 9 is a second embodiment of the punch guide 3 of the present invention.

FIG. 10 is another embodiment of the punch guide 3 and the die 7 of the present invention.

FIG. 11 is an exploded perspective view showing the same embodiment.

FIG. 12 is a longitudinal sectional view of a main part showing another embodiment of the present invention.

FIG. 13 is a perspective view of another embodiment of the die 7 of the present invention.

FIG. 14 is a vertical cross-sectional view of a main part of the punching assembly cut along the line AA in FIG.

[Explanation of symbols]

 1 Punch body 1a Body tip part 2 Bottom center hole 3 Punch guide 3a Guide upper part 3b Guide lower part 3c Bolt 3d, 7d Annular urethane rubber 3e, 7e Annular groove 3f Plate 4 Punch head 5 Elastic body 6 Upper end center hole 7 Die 8 Work concave part Convex part for work 9 Convex part for work recess 10 Work 11 Upper surface recessed part 12 Lower surface recessed part 13 Substrate 14 Movable body 15 Flange part 16 Flange part 18 Support body 19 Inner screw 20 Bore 21 Burr 22 Bolt 23 Washer 24 Auxiliary spring 25 Trapezoidal part 26 Rectangular hole 27 Cylinder 28 Gas 30 Piston 31 O-ring 33 Work separator 34 Spring

Claims (5)

[Claims] 1. A punch body 1, and a cylindrical punch guide 3 fitted below an intermediate portion of the punch body 1 so that a lower end of the punch body 1 can freely move in and out of a bottom center hole 2. Punch head 4 provided at the upper end of the punch body 1
The punch guide 3 and an elastic body 5 interposed between the punch guide 3 and the punch guide 3, and a die 7 having an upper end center hole 6 into which the tip of the punch body 1 freely enters and exits. In the die 7 of the punching assembly supported by the machine so as to be movable up and down, an annular work concave projection 8 is formed at the hole edge of the upper end center hole 6 of the die 7, and the urging force of the elastic body 5 is applied. When the punch head 4 is moved downward against it, an external force in the axial direction applied to the punch guide 3 is applied to the work, so that the work recessed convex portion 8 of the die 7 causes a hole edge of a hole for the work. A die for a punching machine, wherein the die is configured to form an annular recess in the die. 2. The upper end center hole 6 of the die 7 according to claim 1, which is a circular hole. 3. The die according to claim 1, wherein the upper end center hole 6 of the die 7 is a square hole. 4. A punch body 1, and a cylindrical punch guide 3 fitted below an intermediate portion of the punch body 1 so that a lower end of the punch body 1 can be freely inserted and removed from a bottom center hole 2. Punch head 4 provided at the upper end of the punch body 1
The punch guide 3 and an elastic body 5 interposed between the punch guide 3 and the punch guide 3, and a die 7 having an upper end center hole 6 into which the tip of the punch body 1 freely enters and exits. In the punch guide 3 of the punching assembly movably supported in the vertical direction, an annular work concave projection 9 is formed at the hole edge of the bottom center hole 2 of the punch guide 3, and the elastic body 5 is formed. When the punch head 4 is moved downward against the urging force, an external force in the axial direction applied to the punch guide 3 is applied to the work, so that the work recess convex portion 9 of the punch guide 3 punches the work. A punch guide for a punching machine, characterized in that an annular recess is formed at the hole edge of the punch guide. 5. The elastic body 5 according to claim 1 or 4, comprising a gas spring.