JPH064983Y2 - Press mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a press die for burring the edges of through holes formed in a material in advance.

[Prior Art] Conventionally, as a press die for burring the edge of a through hole previously formed in a material, a punch member a is fixedly provided as shown in FIG. A lower die c is supported on the peripheral edge of the punch member a via a spring b, and a material d having a through hole formed in advance is placed on the lower die c. By pressing with e, the material d is clamped with a sufficient pressure, and in the clamped state, the upper mold e is further depressed to lower the mold c.
Burring is performed by engaging the end edge of the through-hole projecting from the end with the end surface of the punch member a and bending it.

In the press die having such a conventional structure, simply the upper die e
By pressing down, the material d can be clamped and burring can be performed, which has an advantage that the structure is simple.

[Problems to be Solved by the Invention] However, in this conventional press die, since the lower die c on which the material d is placed is elastically supported by the peripheral edge of the punch member a via the spring b, Although the relative position on the lower die c can be regulated, it is impossible to precisely regulate the absolute position of the material d (for example, the position with respect to the fixed punch member). Therefore, there is a problem that the burring cannot be executed accurately.
In particular, with this conventional configuration, since the absolute position of the material d cannot be accurately defined, it is not possible to perform piercing at the same time as burring, and this piercing must be performed in a separate process from burlint, and processing efficiency is increased. It has been pointed out that the problem becomes extremely bad.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a press die capable of performing burring with high accuracy and simultaneously performing piercing.

[Means for Solving the Problems] In order to solve the above-mentioned problems and to achieve the object, a press die according to the present invention is a press die for burring edges of through holes formed in a material in advance. At least the edge of the through-hole, at least the edge of the through hole, and the fixed die having a recess on the press surface, and the material placed on the press surface of the fixed die so that the edge of the through-hole projects toward the recess. A movable die that pressurizes the movable die, a movable die holder that supports the movable die to move back and forth with respect to the fixed die, and a movable die that is disposed between the movable die holder and the movable die. An urging member for urging the movable die, a piercing member disposed in the concave portion of the fixed die, a through hole formed in the middle thereof, movably supported with respect to the movable die, and protruding toward the concave portion. A punch member that can come into contact with the edge of the through hole, and the punch member It is attached so that it can move back and forth along the direction that intersects the moving type moving direction.
The engaging member biased to project into the through hole of the punch member and the movable die holder are fixed to the engaging die when the movable die holder is moved to approach the fixed die. Once engaged and pushed in, it enters the inside of the engaging member, and when it is subsequently moved away from the fixed mold, it is locked to the engaging member and the punch member is integrated. A driver member for moving toward the movable die, and the engaging member, which is positioned in the through hole of the punch member and fixed to the fixed die, after the punch member burring the end edge of the through hole. And a release member for releasing the locked state with the driver member.

[Operation] In the press die configured as described above, by moving the movable die holder toward the fixed die, the material is clamped between the movable die and the fixed die via the biasing member,
Further, by moving the movable holder, the driver member fixed to the movable holder engages with the engaging member and pushes it once into the punch member.
The engaging member is located inward of the fixed mold with respect to the engaging member, and the engaging member returns to the original protruding position. After this,
By moving the movable die holder away from the fixed die, the driver member is now locked to the engaging member,
Along with this, the punch member is moved toward the movable die. In this way, the edge of the through hole of the material is burred. On the other hand, when the movable holder is further moved, the engagement member locked to the driver member is engaged with the release member and the locked state with the driver member is released. In this way, the engaging member returns to the original position together with the punch member, and the driver member comes out of the engaging member and returns to the original position separated from the fixed mold.

[Embodiment] The construction of an embodiment of a press die according to the present invention will be described below in detail with reference to FIGS. 1 to 9 of the accompanying drawings.

As shown in FIG. 1, the press die 10 of this embodiment is
Lower mold 12 as a fixed mold configured on a base (not shown)
Is equipped with. The lower die 12 has its upper surface defined as a press surface 16 on which a thin plate 14 (shown in FIGS. 2A and 3 to 9) as a material is placed and clamped. In the center of the surface, the recess 1
8 is formed. A punching member 20 for burring, which will be described in detail later, is arranged in the recess 18 so as to slide vertically.

Here, as shown in FIG. 2A, the thin plate 14 as the material is formed of a substantially rectangular steel plate having a through hole 14a formed in the substantially central portion thereof in advance. Then, the inner peripheral edge of the press surface 16 (that is, the opening end edge that defines the concave portion 18) from the end edge of the through hole 14a of the thin plate 14 in a state where the thin plate 14 is placed on the press surface 16. It is set in a position that is pulled slightly outward. In other words, the thin plate 14 placed on the press surface 16 has a through hole 14 formed therein.
The edge of a is set in a state of slightly protruding inward from the opening edge of the recess 18.

An upper die 22 as a movable die is disposed above the lower die 12 as the fixed die so as to be vertically movable via an upper die holder 24. This upper die holder 24, as shown in the figure,
The upper die 22 is formed of a hollow rectangular parallelepiped whose lower surface is open and whose upper surface is closed, and the upper die 22 is supported so as to be vertically movable with its outer peripheral surface in sliding contact with the inner peripheral surface of the upper die holder 24.
The lower surface of the upper die 22 is defined as a clamp surface 26 that presses the thin plate 14 placed on the press surface 16.

The inner peripheral edge of the clamp surface 26 has a lower die 1 facing it.
The second press surface 16 is set at a position slightly retracted outward from the inner peripheral surface.

Here, there is a sufficient space between the upper surface of the upper die 22 and the upper surface of the hollow portion of the upper die holder 24, and a plurality of first coil springs 28 are arranged between them. The upper die 22 is biased by the biasing force of the first coil springs 28 so as to be biased downward. Further, above the upper die holder 24, a hydraulic cylinder device 30 for vertically moving the upper die holder 24 is arranged. The hydraulic cylinder device 30 includes a piston 32 that is vertically driven by hydraulic pressure, and the lower end of the piston 32 is fixed to the upper surface of the upper die holder 24.

With such a configuration, when the hydraulic cylinder device 30 is activated to push down the piston 32, the upper die holder 24 is pushed down accordingly. By pushing down the upper die holder 24, the upper die 22 is elastically moved through the plurality of first coil springs 28.
This will elastically clamp the thin plate 14 placed on the pressing surface 16 of the.

Here, a punch member 34 for piercing is attached to the clamp surface 26 of the upper die 22 in a state of protruding downward from this. On the other hand, on the press surface 16 of the lower die 12, holes 36 into which the punch member 34 is complementarily inserted are formed at positions facing the punch member 34 described above.

With such a configuration, as described above, when the thin plate 14 is clamped between the lower die 12 and the upper die 22,
A predetermined through hole 14b (shown in FIG. 2B) is formed in the thin plate 14 by the punch member 34, that is, pierced. During the piercing process, the thin plate 14
Since it is placed on the press surface 16 of the lower die 12 fixed on the base, the processing accuracy of this piercing process is set with high accuracy.

On the other hand, the punching member 20 for burring described above is mounted on the bottom surface of the recess 18 of the lower die 12 via the cushioning member 38. Further, as shown in FIG. 3 as a plan view,
A substantially rectangular through hole 40 extending in the vertical direction is formed in the center of the punch member 20. Further, outer flange portions 42 are integrally formed at both left and right ends of the bottom portion of the punch member 20, and the outer flange portions 42 corresponding to the outer flange portions 42 are allowed to move vertically. In the lower part of the side surface where the portion 42 faces, the auxiliary recess 4
4 are formed.

Here, a plurality of second coil springs 46 are provided between the upper surface of each outer flange portion 42 of the punch member 20 and the upper surface of the corresponding auxiliary recessed portion 44, so that the punch member 20 is always maintained. It is pushing downwards.

Recesses 48 extending in the left-right direction are formed on both side surfaces defining the through hole 40 of the punch member 20, and an engaging member 50 is formed in the left-right direction in each recess 48. It is movably fitted along the. In other words, each engagement member 50 is arranged in the through hole 40 so as to be able to move back and forth from the recess 48. Here, each engagement member 50 is urged by the third coil spring 52 in the direction of protruding from the recess 48 into the through hole 40.

A tapered surface 54 is formed at the tip of each engaging member 50, that is, the upper edge of the end projecting into the through hole 40, while the bottom surface thereof is formed flat.

Here, a pair of release members 56 a and 56 b are erected upright on the bottom surface of the recess 18 while being positioned inside the through hole 40. These release members 56a, 56b
The punch member 20 described above is provided on the upper portion of these thin plates 1.
After burring the edge of the through hole 14a of No. 4,
The taper surface 54 of the engaging member 50 has outward taper surfaces 58a, 58b (the taper surface 58a is not shown), and the taper surface 54 of the engaging member 50 has these releasing members 56a. , 56b outwardly tapered surfaces 58a, 58b
By engaging with the driver member 60 and the engaging member 50, which will be described later, the locked state is released.

As is apparent from FIG. 3, one release member 56a
Is on the near side in the through hole 40 and the other release member 56.
b are arranged so as to be located on the opposite sides of the through holes 40, respectively.

As shown in FIG. 1 again, a driver member 60 is integrally attached to the central portion of the lower surface of the above-mentioned upper die holder 24 in a state of standing downward from here. As shown in FIG. 3, the driver member 60 is arranged so as to be located exactly between the pair of releasing members 56a and 56b, and it is assumed that this driver member 60 is lowered as the upper die holder 24 is lowered. Is also set so as not to interfere with these release members 56a and 56b.

Here, at the lower part of the driver member 60, the locking portion 62
Are integrally formed in a bulged state.
The upper surface of 2 is set flat so that it can be engaged with the lower surface of the engaging member 50 described above. On the other hand, tapered surfaces 64 are formed on the left and right edges of the locking portion 62, and the tapered surfaces 64 are engaged with the corresponding tapered surfaces 54 of the left and right engaging members 50, thereby engaging the engaging members 5 with each other.
It is set so that 0 can be pushed inward against the biasing force of the third coil spring 52.

In the press die 10 configured as described above, the second A
A piercing process and a burring process from the thin plate 14 shown in FIG. 2B will be described with reference to FIGS. 4 to 9.

First, as shown in FIG. 4, the thin plate 14 as the material shown in FIG. 2A is placed on the pressing surface 16 of the lower mold 12 of the press mold 10 in which the upper mold 22 is spaced upward from the lower mold 12. To do. In this mounted state, the edge of the through hole 14a formed in the thin plate 14 is set to be inwardly projected from the opening edge of the recess 18 formed in the lower die 12, as shown in the figure. .

From the state shown in FIG. 4, press working, that is, piercing and burring is started.

That is, first, hydraulic pressure is supplied to the hydraulic cylinder device 30 from a hydraulic pressure supply source (not shown) to activate the hydraulic cylinder device 30, and the piston 32 is pushed downward. As the piston 32 is pushed down, the upper die holder 24 fixed to the tip of the piston 32 descends, and the upper die 22 is biased downward via the first coil spring 28. As a result, in the thin plate 14, the through hole 14b (shown in FIG. 2B) is formed, that is, the piercing process is performed, by the piercing punch member 34 attached to the clamp surface 26 of the upper die 22. Then, as the upper die holder 24 further descends, the pierced thin plate 14 is elastically moved between the clamp surface 26 of the upper die 22 and the pressing surface 16 of the lower die 12, as shown in FIG. Will be clamped to.

From the state shown in FIG. 5, the hydraulic cylinder device 3 is further added.
When the hydraulic pressure is supplied to 0, the upper die 22 keeps its position with the thin plate 14 elastically abutting the lower die 12, the upper die holder 24 applies the urging force of the first coil spring 28. It will be pushed down further against. As a result,
As shown in FIG. 6, the taper surface 64 formed at the lower end of the driver member 60 fixed to the upper die holder 24 has the taper surface of each of the engaging members 50 attached to the punching member 20 for burring. It will engage the surface 54.

Here, as described above, the driver member 60 is set in a nested shape so as not to interfere with the pair of releasing members 56a and 56b, as shown in FIG. Engagement between the tapered surface 64 and the respective tapered surfaces 54 of both engaging members 50 is achieved.

As shown in FIG. 6, with the tapered surface 64 of the driver member 40 engaged with the tapered surface 54 of each of the engaging members 50, the upper die holder 24 is further pushed down to lower the driver member 40. Then, based on the engagement between the tapered surfaces 64 and 54, the engagement member 50 is brought into contact with both side surfaces of the release members 56a and 56b by the urging force of the third coil spring 52, respectively. Spring 5
Against the urging force of No. 2, once pushed into the recess 48 formed in the punch member 20, in other words, as the driver member 60 descends, the engaging member 50 retreats laterally,
Further, the driver member 60 descends and enters the through hole 40 of the punch member 20.

After that, as shown in FIG. 7, when the locking portion 62 formed at the lower end of the driver member 60 passes downward from both the engaging members 50, the two engaging members 50 move to the third position. By the biasing force of the coil spring 52, the coil spring 52 projects into the through hole 40 and again comes into contact with both side surfaces of the release members 56a and 56b.

On the other hand, when the state shown in FIG. 7 is reached, the hydraulic pressure supply operation from the hydraulic pressure supply source (not shown) is stopped, and the pushing down operation of the upper die holder 24, that is, the lowering operation of the driver member 60 is stopped.

After that, the switching valve (not shown) in the hydraulic pressure supply path to the hydraulic cylinder device 30 is switched, and the piston 32 is pushed up as the hydraulic pressure supply operation of the hydraulic pressure supply source is restarted. By pushing up the piston 32, the upper die holder 24 rises together with the driver member 60,
The upper surface of the engaging portion 64 formed at the lower end of the driver member 60 is engaged with the flat lower surfaces of both engaging members 50 and is pulled up. As the engaging members 50 are pulled up, the punch members 20 to which they are attached are attached.
Also, against the biasing force of the second coil spring 46, it is lifted from the state of being mounted on the bottom surface of the recess 18 formed in the lower mold 12 via the buffer member 38.

In this way, the lower die 1 is moved by the end surface of the punch member 20.
The end edge of the through hole 14a of the thin plate 14 clamped between the upper mold 22 and the upper mold 22 is processed to be bent upward over the entire circumference, and so-called burring processing is achieved.

After that, the driver member 60 is further raised, and as shown in FIG.
4 engages with the outward taper surfaces 58a and 58b of the pair of release members 56a and 56b, respectively. As a result,
Due to the engagement of the taper surface 54 and the outward taper surfaces 58a and 58b, the two engaging members 50 are urged by the third coil spring 52 as shown in FIG. Against this, the punch member 20 is pushed inward.

In this way, the engaging state between the lower surface of both the engaging members 50 and the upper surface of the engaging portion 62 of the driver member 60 is released as the engaging members 50 retreat to the side, and by this release, the punch member 20 is released. Is due to the urging force of the second coil spring 46,
It is pushed down, and as shown in FIG. 4, it returns to the state in which it is placed on the bottom surface of the recess 18 via the cushioning member 38.

After that, the piston 32 is further pushed up, and the upper die holder 24 is raised, so that the upper die 22 is also lifted and is separated from the lower die 12 upward, so that the thin plate 14 pierced and burred is removed. , It will be opened on the lower mold 12 in the state of being molded as shown in FIG. 2B.

In this way, a series of press working operations is completed.

As described above in detail, in this embodiment, the thin plate 14 as a material is placed on the lower die 12 fixed on the base. As a result, the absolute position of the thin plate 14 is accurately defined, and the piercing process can be performed simultaneously with the burring process. Further, the positional accuracy of the burring process is improved, and the commercial value of the processed product is improved. Further, the separate processing for executing the piercing processing becomes unnecessary, and the processing efficiency is extremely improved.

Further, in this embodiment, the upper die holder 24 integrally provided with the drive member 60 is simply moved up and down, and more specifically, the upper die holder 24 is lowered to perform piercing, and after the lowering. By raising in
Since the burring process is performed, the structure of the drive mechanism is greatly simplified.

It is needless to say that the present invention is not limited to the configuration of the above-described embodiment and can be variously modified without departing from the gist of the present invention.

[Effects of the Invention] As described in detail above, the press die according to the present invention is a press die for burring the edge of the through hole formed in the material in advance, and the fixed die having the depression surface formed therein. When,
A movable die that presses a material placed on the press surface of the fixed die so that the edge of the through hole projects toward the recess, except at least the edge of the through hole. A movable die holder that supports the movable die so as to move back and forth with respect to the fixed die, and is disposed between the movable die holder and the movable die,
An urging member for urging the movable die against the fixed die, and a biasing member disposed in the concave portion of the fixed die, having a through hole formed in the middle thereof, supported movably with respect to the movable die, and provided in the concave portion. A punch member that can be brought into contact with the end edge of the through hole that is taken out toward the punch member, and is attached to the punch member so as to be movable back and forth along a direction intersecting the moving mold reciprocating direction and projecting into the through hole of the punch member Is fixed to the movable die holder and the movable die holder is moved so as to approach the fixed die, the engagement member is engaged and pushed once. In this state, enter the inside of the engaging member, and then
When it is moved away from the fixed die, it is positioned in the through hole of the punch member and a driver member for engaging the engaging member to move the punch member integrally toward the movable die. A releasing member that is fixed to the fixed die and that engages with the engaging member after the punching member has burred the edge of the through hole and releases the locked state between the punching member and the driver member. It is characterized by doing.

Therefore, it is possible to provide a press die that can perform burring with high accuracy and can simultaneously perform piercing.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the structure of an embodiment of a press die according to the present invention; FIG. 2A is a perspective view showing the shape of a thin plate as a raw material before processing; FIG. 2B is a shape of a thin plate after processing. FIG. 3 is a plan view showing the structure of a punching member for burring used in the press die shown in FIG. 1; FIGS. 4 to 9 are thin plates using this press die. Vertical sectional view showing the piercing and burring operations in sequence;
And, FIG. 10 is a longitudinal sectional view showing the structure of a conventional press die. In the figure, 10 ... Press mold, 12 ... Lower mold (fixed mold), 14 ...
Thin plate (material), 16 ... Press surface, 18 ... Recessed portion, 20 ... Burring punch member, 22 ... Upper die (movable die), 24 ...
Upper die holder (movable die holder), 26 ... Clamping surface, 28
... first coil spring, 30 ... hydraulic cylinder device,
32 ... Piston, 34 ... Punching member for piercing, 36
... Hole, 38 ... Buffer member, 40 ... Through hole, 42 ... Outer flange portion, 44 ... Auxiliary recessed portion, 46 ... Second coil spring, 48 ... Recessed portion, 50 ... Engaging member, 52 ... Third coil Spring 54, taper surface, 56a; 56b ... release member, 58a; 58b ... outward taper surface, 60 ... driver member, 62 ... locking portion, 64 ... taper surface.

Claims (1)

[Scope of utility model registration request] 1. A press die for burring an edge of a through-hole formed in a material in advance, which comprises a fixed die having a depression formed on a press surface, and a through-hole of the through-hole on the press surface of the fixed die. A movable die for pressurizing a material placed so that its edge protrudes toward the concave portion except at least the edge of the through hole, and a movement for supporting the movable die so as to be movable back and forth with respect to the fixed die. A mold holder, an urging member arranged between the movable mold holder and the movable mold, for urging the movable mold against the fixed mold, and arranged in a concave portion of the fixed mold. A punch member that has a through hole formed therein and is supported so as to be movable back and forth with respect to the movable die, and that can abut against an edge of the through hole that projects toward the concave portion; It is attached so that it can move back and forth along the direction that intersects with the inside of the through hole of the punch member. The engaging member urged to come out and fixed to the movable die holder, and when the movable die holder is moved to approach the fixed die, engages with the engaging member and once When it is pushed into the inside of the engaging member and then moved away from the fixed mold, the punch member is locked to the engaging member to move the punch member integrally toward the moving mold. And a driver member for, which is located in the through hole of the punch member and is fixed to the fixed die, and the punch member engages the engaging member after burring the edge of the through hole, and A press die comprising: a release member for releasing the locked state with the driver member.