JPS6324981Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a press die for drilling holes in plate material, and in particular, the punch assembly is arranged at the bottom and the die assembly is arranged at the top. Regarding press dies for drilling and burring.

[Conventional technology]

Conventionally, when drilling and burring using a press die, in order to prevent the punched scraps from being punched from the plate from being scattered on the plate,
The scraps were allowed to fall downward.

[Problem that the invention attempts to solve]

However, in order to cause the punched scraps to fall downward as described above, the die assembly is first lowered once to punch a pilot hole in the plate material, and then the die assembly is raised once to allow the punched scraps to fall. After dropping the die assembly downward, it is necessary to lower the die assembly again and squeeze out the area around the pilot hole of the plate material to form a hole flange. It was not possible to achieve both the punching of the hole and the pressing out of the hole flange, resulting in a significant decrease in work efficiency.

[Purpose of invention]

The present invention was made to solve the above-mentioned conventional problems, and there is no need to drop the punching chips downward, and the pilot hole can be punched and the hole flange can be ironed with only one downward stroke of the die assembly. It is an object of the present invention to provide a press mold for drilling and burring, which can achieve both drilling and burring operations, and can significantly improve the work efficiency of burring.

[Means for solving problems]

The press die for drilling and burring according to the present invention is a press die for drilling and burring in which a punch assembly is disposed below and a die assembly that cooperates with the punch assembly is disposed above. The die assembly includes a die body that is raised and lowered by a press machine, a die hole provided in the die body, and a lower end that can be raised and lowered with respect to the die body on the inside of the die body. a die chip to be penetrated into the die chip, a scrap accommodating portion provided inside the die chip, and a chip accommodating portion provided inside the die chip;
A die provided at the lower end of the chip that communicates the outside of the die chip with the scrap accommodating portion.
The punch assembly has a tip hole and a die spring that biases the die tip downwardly with respect to the die body so that the lower end of the die tip penetrates deeper into the die hole. The punch is fixed at a fixed position with its tip facing upward, a prepared hole forming part formed at the tip of the punch that penetrates into the die tip hole, and a hole forming part formed below the prepared hole forming part. a hole flange forming part formed on the punch, which has a diameter larger than the diameter of the prepared hole forming part but smaller than the diameter of the die hole by an amount corresponding to the thickness of the plate material to be processed, and penetrates into the die hole; a stopper portion formed on the punch below the prepared hole forming portion and having a thickness that does not allow entry into the die hole; and a liftable punch ejector on which the plate material is placed on the upper end; An ejector spring that urges the punch ejector upward is provided on the punch ejector, and when the punch ejector is pushed down by the die body through the plate material, the tip end side of the punch is It has a punch protrusion hole that protrudes upward from the ejector.

[Effect]

In the present invention, when the die body is pushed down and the lower end surface of the die body comes into contact with the plate while the plate is placed on top of the punch ejector, the plate and the punch ejector move against the ejector spring. begins to descend. However, since the punch is fixed and cannot be lowered, first a pilot hole is punched into the plate material using the pilot hole forming part of the punch and the die tip hole, and the pilot hole forming part is used together with the scraps punched from the pilot hole. Invades the die/chip hole.

Next, when the die body further descends, the plate material and punch ejector further descend against the ejector spring, the hole flange forming part of the punch enters the die hole, and the area around the pilot hole of the plate material is squeezed out. to form a hole flange. At this time, the die tip comes into contact with the stopper portion of the punch and cannot be lowered any further and is stopped.
Therefore, as the die body descends, the die spring becomes compressed.

Next, when the die body is raised, the die tip is lowered relative to the die body and die guide by the force of the die spring, while the punch ejector is raised by the force of the ejector spring, and The punch exits through the die tip hole and the die hole. This returns the mold to its initial state.

Thereafter, each time the plate material is moved to a predetermined position, the above-described operation is repeated, and holes with hole flanges are punched out one after another at the predetermined position of the plate material. Moreover, each time a hole is punched in the plate material in this manner, punching scraps are generated, and these punching scraps are successively stored in the punching scrap storage portion from the die hole.

According to this press die for drilling and burring, the punched chips are accommodated in the punched chip storage section of the die assembly as described above, so there is no need to drop them downward as in the conventional method. Therefore, both the punching of the pilot hole and the pressing out of the hole flange can be achieved with only one downward movement of the die assembly as described above.
The work efficiency of burring processing can be significantly improved.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

1 to 5 show an embodiment of the present invention. In this embodiment, the punch assembly 1 is constructed as follows. A punch 4 is fixed by a bolt 3 to a punch block 2 which is fixed to a turret or the like of a numerically controlled turret punch press (not shown). This punch 4 includes, in order from its upper end to its lower end,
A prepared hole forming part 4a, a hole flange forming part 4b, and a guide part 4c are formed. The hole flange forming part 4b further has a straight part 4b which has a larger diameter than the pilot hole forming part 4a but has a smaller diameter than the diameter of the die hole 15a by an amount corresponding to the thickness of the plate material 21 to be processed. ', and a tapered stopper part 4 connecting this straight part 4b' and the prepared hole forming part 4a.
It consists of "b".

A center hole 5a provided at the center of the punch ejector 5 is slidably fitted into the guide portion 4c of the punch 4, so that the punch ejector 5 can be inserted into the punch 4 and the punch block 2.
It is said that it is possible to go up and down.

The punch block 2 has three punches at 120 degree intervals.
Two space holes 2a are provided, and cylindrical spacers 6 are fitted into each of these space holes 2a so as to be movable up and down. Bolts 7 are inserted through each of these spacers 6 from below, and the tips of these bolts 7 are screwed into the punch-ejector 5. Further, the bolt 7 and the spacer 6 are punched between the head 7a of the bolt 7 and the lower end of the spacer 6.
A washer 8 is interposed to prevent the block 2 from coming off. As a result, the upper limit position of the punch ejector 5 relative to the punch block 2 and punch 4 can be determined by the height of the spacer 6.

Three spring receiving recesses 2b are provided on the upper surface side of the punch block 2 at intervals of 120 degrees.
Further, on the lower surface side of the punch ejector 5,
Three spring receiving recesses 5b are provided at 120 degree intervals corresponding to the spring receiving recesses 2b. And between each spring receiving recess 2b and 5b,
Ejector springs 9 each consisting of a compression coil spring are interposed, and these springs 9
The ejector 5 is urged upward.

The punch block 2 is vertically penetrated by chip drop holes 2c which open at the bottoms of the spring receiving recesses 2b. Further, the punch/ejector 5 is vertically penetrated with a chip drop hole 5c that opens in the ceiling surface of each spring receiving recess 5b.
Note that each of these chip falling holes 5c is continuous with the center hole 5a.

Although the punch assembly 1 has the above-described configuration, the die assembly 10 that is moved up and down above the punch assembly 1 is configured as follows.

A set screw 12 is attached to the upper end of the die guide 11.
The die head 13 is fixed by. Further, a die main body 15 is fixed to the lower end of the die guide 11 by bolts 14. A die chip 17 is housed in a space 16 formed inside the die guide 11 and the die body 15, and this die chip 17 is attached to the die body 1.
The die collar 18 fixed inside the die collar 18 and the inner surface of the die body 15 are fitted so as to be movable up and down.

A die hole 15a having a diameter corresponding to the diameter of the straight portion 4b' of the punch 4 is provided at the lower end of the die body 15. Further, a protrusion 17a having an outer diameter corresponding to the die hole 15a is provided at the lower end of the die chip 17, and a die tip hole 17b passes through the protrusion 17a. In addition, this die tip hole 17b
The die tip hole 17b is a tapered hole whose diameter becomes larger toward the top, and the diameter of the lower end of the die tip hole 17b corresponds to the diameter of the prepared hole forming portion 4a of the punch 4.

Inside the die chip 17, a scrap accommodating portion 19 is provided continuous to the upper end of the die chip hole 17b. Furthermore, a die spring 20 made of a compression coil spring is interposed between the die tip 17 and the die collar 18, and this die spring 20 urges the die tip 17 downward. .

Next, the operation of this embodiment will be explained.

In the initial state (the state shown in FIG. 1), the punch ejector 5 is biased to the upper limit position by the force of the ejector spring 9, and at this time, the punch ejector 5 is biased to the upper limit position by the force of the ejector spring 9.
The upper end surface of the ejector 5 and the upper end surface of the punch 4 are at the same height. Further, the die tip 17 is biased to the lower limit position with respect to the die guide 11 and the die body 15 by the force of the die spring 20, and at this time, the protrusion 17a of the die tip 17
is fitted into the die hole 15a, and the protrusion 17a
The lower end surface and the lower end surface of the die body 15 are at the same height.

Next, with the plate material 21 placed on the upper part of the punch ejector 5, the die guide 11 is pushed down, and the lower end surface of the die body 15 is placed on the plate material 21.
When the plate material 21 and the punch ejector 5 come into contact with the ejector spring 9, the plate member 21 and the punch ejector 5 begin to descend against the ejector spring 9.
However, since the punch 4 is fixed and cannot be lowered, as shown in FIG. Forming part 4a
enters the die tip hole 17b together with the punching material 22 punched out from the pilot hole 21a.

Next, when the die guide 11 further descends,
As shown in FIG. 3, the plate material 21 and the punch ejector 5 further descend against the ejector spring 9, and the straight part 4b' of the hole flange forming part 4b of the punch 4 enters the die hole 15a, and the plate material 2
The peripheral portion of the pilot hole 21a of No. 1 is squeezed out to form a hole flange 21b. At this time, the die tip 17 comes into contact with the stopper portion 4b'' of the punch 4, and stops as it cannot be lowered any further. Therefore, as the die guide 11 descends, the die spring 20 is being compressed.

Next, when the die guide 11 is raised, the die tip 17 is lowered relative to the die body 15 and the die guide 11 by the force of the die spring 20, while the punch ejector 5 is moved by the force of the ejector spring 9. The punch 4 rises due to the force of , and the punch 4 comes out of the die tip hole 17b and the die hole 15a. This returns the mold to the initial state shown in FIG. In addition, even in this state, the scraps 2
2 will not fall downward from the die tip hole 17b.

Thereafter, each time the plate material 21 is moved to a predetermined position, the above-described operation is repeated, and holes with hole flanges are punched one after another at the predetermined positions of the plate material 21. Here, each time a hole is punched in the plate material 21, punching scraps 22 are generated, and these punching scraps 22 are successively pushed up from the die hole 17b to the punching scrap storage section 19, and are stored in the housing section 19. Ru. It should be noted that the scrap accommodating portion 19 holds the scrap 2.
2, the die tip 17 can be removed from the die guide 11 and the scraps 22 can be taken out from the scrap storage section 19.

According to this press die for drilling and burring, the punched waste 22 is removed from the die as described above.
Since it is stored in the scrap storage section 19 of the assembly 10, there is no need to drop it downward as in the conventional case. Therefore, as described above, the die assembly 10 only needs to move down once to open the pilot hole 21a.
It is possible to achieve both the punching of the hole flange 21b and the pressing out of the hole flange 21b, and the work efficiency of the burring process can be significantly improved.

Note that even if the die tip hole 17b is a straight hole, the punched chips 22 will not fall downward, but if it is made into a tapered hole as in this embodiment, the punched chips 22 will not rise. It is done smoothly.

Further, when the prepared hole 21a is punched, fine chips are generated, but in this embodiment, these chips are transferred to the chip drop hole 5c of the punch ejector 5.
Then, these chips fall downward through the chip drop hole 2c of the bunch block 2, so these chips
The operation of the punch assembly 1 will not be hindered by jamming between the ejector 5 and the punch 4 or between the ejector spring 9 or the like.

6 to 8 show other embodiments of the present invention. In this embodiment, 1 is a punch assembly substantially similar to that of the previous embodiment.

31 is a die assembly that is raised and lowered above the punch assembly 1, and this die assembly 31 is constructed as follows.

A die body 35 is fixed to the lower end of the die guide 32 by bolts 34. Further, inside the die guide 32, a scrap storage section 3 is provided.
6 is provided, and this scrap accommodating portion 36 is communicated with the die hole 35a of the die main body 35 via a scrap fall prevention member 37. The scrap falling prevention body 37 is disc-shaped and made of highly elastic elastomer such as rubber or synthetic resin.
Its outer peripheral portion is fixed between the die guide 32 and the die body 35. The scrap fall prevention body 37 is provided with a cross-shaped cut 38, as shown in FIG.

Next, the operation of this embodiment will be explained.

In this embodiment, when the die guide 32 descends, a pilot hole is first punched in the plate material 21 by the pilot hole forming portion 4a of the punch 4 and the die hole 35a.
Then, when the die guide 32 further descends,
Hole flange forming part 4b of punch 4 and die hole 35a
As a result, as shown in FIG. 7, the portion of the plate material 21 around the prepared hole is squeezed out to form a hole flange 21b. Further, the scraps 22 generated when the pilot hole is punched pass through the cut 38 of the scrap fall prevention member 37 together with the upper end surface of the punch 4, and enter the scrap accommodating portion 36.

Then, the die guide 32 is raised,
Even if the punch 4 comes out of the cut 38 and the die hole 35a, the cut 38 is closed, so the punched chips 22 remain on the chip fall prevention member 37 as shown by the dashed line in FIG. It will not fall below the preventer 37.

FIG. 9 shows a scrap fall prevention body 39 that replaces the scrap fall prevention body 37 in the embodiment shown in FIGS. It is set in.

FIGS. 10 and 11 show still another embodiment of a dropping scum fall prevention mechanism that replaces the slug falling prevention mechanism in the embodiment shown in FIGS. 6 to 8. In this embodiment, reference numeral 41 is an elastic ring made of an elastomer such as highly elastic rubber or synthetic resin. and the die body 35. Two approximately semicircular iron plates 44 and 45 are provided on the inner circumference of the elastic ring 41.
The outer periphery of is fitted. Further, the two iron plates 44, 45 have semicircular grooves 44a, 45a.
are provided for each.

In this embodiment, the punching chips 22 rise together with the punch 4, and the punching chips 22 move into the grooves 4.
4a, 45a, the iron plates 44, 45 move against the elastic ring 4 in a plane parallel to the plane of the paper in FIG.
1, the gap between the grooves 44a and 45a is widened, and the scraps 22 are allowed to enter the scrap accommodating portion 36 through the gap. Then, when the die assembly 31 is lifted up, the iron plates 44 and 45
moves to the center side of the elastic ring 41 again, and the groove 44
Since the gap between a and 45a is narrowed, the scraps 22 cannot fall downward.

FIG. 12 shows still another embodiment of the dropping debris fall prevention mechanism. In this embodiment, three rods 47 are mounted on a rod support 46 fixed between the die guide 32 and the die body 35.
The rods 47 are supported so as to be movable in the radial direction, and the distal ends of these rods 47 are provided with enlarged portions 47a. A compression coil spring 48 is interposed between each enlarged portion 47a and the rod support member 46, and these springs 48 bias the rod 47 toward the center of the die guide 32. . A disk 49 is attached to the lower part of the rod support member 46, and a hole 49a is provided in the center of the disk 49.

In this embodiment, when the punched scraps 22 rise together with the punch 4, pass through the hole 49a, and come into contact with each enlarged portion 47a, each rod 47 moves to the outer peripheral side of the die guide 32, and each enlarged The gap between the parts 47a is widened, and the scraps 22 are allowed to enter the scrap accommodating part 36 through the gap. And die
When the assembly 31 is raised, each rod 47 moves toward the center of the die guide 32 again, narrowing the gap between the enlarged portions 47a, so that the scraps 22 cannot fall downward.

FIG. 13 shows yet another embodiment of the dropping debris fall prevention mechanism. In this embodiment, 50 is a spring support disk fixed between the die guide 32 and the die body 35, and the center of this disk 50 is provided with a hole 50a. One end portion of three leaf springs 51 is fixed to the outer peripheral side of the spring support disk 50. And these leaf springs 51
The other end extends over the hole 50a and is a free end.

In this embodiment, when the scraps 22 rise together with the punch 4, pass through the hole 50a, and come into contact with the free end of each leaf spring 51, each leaf spring 5
The free end side of 1 is curved upward to widen the gap between the free ends, and the scraps 22 are allowed to enter the scrap accommodating portion 36 through the gap. And die
When the assembly 31 is raised, each leaf spring 51
returns to its original state and the gap between the free ends of the leaf springs 51 narrows, so the scraps 22 cannot fall downward.

[Effect of idea]

As described above, the press die for drilling and burring according to the present invention does not require dropping the punching chips downward, and it is possible to punch out the pilot hole and press out the hole flange with only one downward stroke of the die assembly. Both of these can be achieved, and the excellent effect of significantly improving the efficiency of burring processing can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of a press mold for drilling and burring according to the present invention;
3 and 3 are enlarged sectional views of the embodiment, FIG. 4 is a plan view of the punch assembly of the embodiment, FIG. 5 is a bottom view of the die assembly of the embodiment, and FIGS. The figure is a sectional view showing another embodiment of the press die for drilling and burring according to the present invention, FIG. 8 is a sectional view taken along the - line in FIG. FIG. 10 is a plan view showing an embodiment, and FIG. 10 is a sectional view showing still another embodiment of the scrap fall prevention mechanism.
Figure 1 is a cross-sectional view taken along the line XI-XI in Figure 10.
FIG. 2 is a cross-sectional view showing still another embodiment of the dropping dregs fall prevention mechanism, and FIG. 13 is a plan view showing still another embodiment of the dregs falling prevention mechanism. 1...Punch assembly, 4...Punch,
4a... Pilot hole forming part, 4b... Hole flange forming part, 4b'... Stopper part, 5... Punch ejector, 5a... Punch protruding hole, 9... Ejector spring, 10... Die assembly, 15...Die body, 15a...Die hole, 17...Die tip, 17b...Die tip hole, 19...Damage storage section, 20...Die spring, 21...Plate material, 3
1...Die assembly, 35...Die body,
35a...Die hole, 36...Drums storage section.

Claims (1)

[Claims for Utility Model Registration] A press die for drilling and burring, in which a punch assembly is disposed below and a die assembly that cooperates with the punch assembly is disposed above, the die assembly being , a die body that is lifted and lowered by a press machine, a die hole provided in the die body, and a die chip that is movable up and down with respect to the die body inside the die body and whose lower end part enters the die hole. , a scrap accommodating section provided inside the die chip, and the die chip.
A die provided at the lower end of the chip that communicates the outside of the die chip with the scrap accommodating portion.
The punch assembly has a tip hole and a die spring that biases the die tip downwardly with respect to the die body so that the lower end of the die tip penetrates deeper into the die hole. The punch is fixed at a fixed position with its tip facing upward, a prepared hole forming part formed at the tip of the punch that penetrates into the die tip hole, and a hole forming part formed below the prepared hole forming part. a hole flange forming part formed on the punch, which has a diameter larger than the diameter of the prepared hole forming part but smaller than the diameter of the die hole by an amount corresponding to the thickness of the plate material to be processed, and penetrates into the die hole; a stopper portion formed on the punch below the prepared hole forming portion and having a thickness that does not allow entry into the die hole; and a liftable punch ejector on which the plate material is placed on the upper end; An ejector spring that urges the punch ejector upward is provided on the punch ejector, and when the punch ejector is pushed down by the die body through the plate material, the tip end side of the punch is A press mold for drilling and burring, which has a punch protrusion hole that protrudes upward from an ejector.