JP5372625B2 - Aperture mold - Google Patents

Description

  The present invention relates to a drawing die.

FIG. 5 shows a cross section of the clamping process of the drawing die 100 according to the prior art. As shown in FIG. 5, the die 100 has a die 112 attached to an upper die set 110 and a punch 122 attached to a lower die set 120. The pad 124 disposed around the punch 122 is attached to a cushion 130 disposed below the lower die set 120 via a cushion pin 126.
When the die 100 is clamped, pressure is applied to the pad 124 by the cushion 130 via the cushion pin 126, and the periphery of the material 128 is pressed by the die 112 and the pad 124 to prevent wrinkles and cracks from occurring. The pressing force can be generated.
Japanese Patent Laid-Open No. 10-80730 (Patent Document 1), a prior art document, discloses a diaphragm having a structure in which a cushion pin supports a blank holder from below a lower mold base plate, similar to the diaphragm mold 100 shown in FIG. The type is described.

Japanese Patent Laid-Open No. 10-80730

  However, the conventional drawing die 100 has a structure in which the cushion 130 is disposed outside the lower die set 120, so that the die becomes large and the press capability is reduced by the pressure applied by the cushion 130. Then, only the stroke height of the cushion pin 126 can be reduced, and the cushion pressure can be increased only up to the cushion capacity of the cushion 130.

  Therefore, the problem to be solved by the present invention is that it is possible to generate a wrinkle pressing force that suppresses the generation of wrinkles and cracks between the pad and the die without using a cushion on the outside of the die set. It is providing the aperture die which can ensure thickness.

In order to solve the above-mentioned problems, the drawing die according to the present invention takes the following means.
First, the first invention of the present invention is a drawing die in which a punch side die set to which a pad via a punch and a biasing member is attached and a die side die set to which the die is attached face each other in the vertical direction. And
The die-side die set is provided with a substantially rectangular lock cam that is movably engaged in the left-right direction on the left and right outer sides of the die.
The side surface of the lock cam facing the die is formed with a U-shaped recess having a substantially horizontal inner surface that can sandwich the die and the side of the pad from above and below. On the outer side, the tip is inclined and the base is vertical,
The aperture die includes a moving means for moving the lock cam inward in the left-right direction and a return means for returning the lock cam to its original position.
The moving means is a substantially rectangular cam driver disposed on the left and right outside of the pad of the punch-side die set,
The side of the cam driver facing the pad has an inclined tip and a vertical base.
During the clamping operation of the drawing die, the inclined surface of the cam driver and the inclined surface of the lock cam are in contact with each other with a gap between the punch and the material sandwiched between the die and the pad. The lock cam slides inward in the left-right direction, and before the gap between the punch and the material disappears, the side of the die and the pad is sandwiched and fixed in the recess of the lock cam from above and below, With the lock cam fixed to the die and the pad, the lock cam has finished sliding inward in the left-right direction, and the vertical surface of the cam driver is in contact with the vertical surface of the lock cam.
A diaphragm in which the lock cam and the cam driver slide relative to each other in the vertical direction and the mold clamping proceeds in a state where the cam driver is in contact with the lock cam sandwiching the die and the pad from the outside in the lateral direction. It is a type.

According to the first aspect of the present invention, the side of the die and the pad is sandwiched from the vertical direction in the concave portion of the lock cam, so that the distance between the die and the pad can be made constant so that it can act as a cushion and is necessary for the diaphragm. Pressure can be secured. Then, the lock cam and the cam driver slide relative to each other in the vertical direction and the mold clamping proceeds, so that the stroke height is secured.
Therefore, without using a cushion on the outside of the die set, it is possible to generate a wrinkle pressing force that suppresses the generation of wrinkles and cracks between the pad and the die, and a drawing die that can secure a stroke height. Can be provided.

Next, a second invention of the present invention is the drawing die according to the first invention, wherein the return means is disposed between a pad of the punch-side die set and a cam driver, Is a substantially L-shaped release driver projecting outward in the left-right direction, and a depression-tilt surface that is a depression angle toward the tip is formed at the tip of the release driver in the left-right direction,
The lock cam is formed with a release inclined surface that can come into contact with the depression inclined surface of the release driver,
When the aperture mold is opened, the depression inclined surface of the release driver and the release inclined surface of the lock cam come into contact with each other, and the lock cam slides outward in the left-right direction and returns to its original position.
According to the second aspect of the present invention, when the mold is opened, the release driver can release the state in which the lock cam sandwiches the pad and the die with a simple structure using the force of the mold opening.

Next, a third invention of the present invention is the drawing die according to the second invention, wherein the die-side die set is formed with a recess capable of accommodating the tip of the release driver. The punch-side die set is formed with a recess capable of accommodating the tip of the lock cam.
According to the third aspect of the invention, since the leading ends of the lock cam and the release driver are accommodated in the recesses formed in each die set, the stroke of the drawing die can be lengthened.

According to each invention of the present invention described above, the following effects can be obtained.
First, according to the first invention described above, a wrinkle and a crack are suppressed between the pad and the die without using a cushion on the outside of the die set by sandwiching the die and the pad in the recess of the lock cam. It is possible to provide a drawing die that can generate a pressing force and can secure a stroke height.
Next, according to the above-described second invention, when the mold is opened, the release driver can release the state in which the lock cam sandwiches the pad and the die with a simple structure using the force of the mold opening.
Next, according to the above-mentioned third invention, the stroke of the drawing die can be lengthened.

It is a front view by the cross-section display of the drawing die of Example 1. It is a side view of the aperture die of Example 1. It is an external appearance perspective view of a lock cam, a cam driver, and a release driver. It is a figure explaining the operation | movement at the time of the mold clamping of the drawing die of Example 1. FIG. It is sectional drawing of the drawing die by a prior art.

  Hereinafter, modes for carrying out the present invention will be described according to examples.

[Configuration of aperture die]
FIG. 1 shows a front view of the drawing die 10 according to the first embodiment of the present invention in a sectional view, and FIG. 2 shows a side view of the drawing die 10. FIG. 1 shows a combination of cross sections at a plurality of depth positions of the aperture die 10.
As shown in FIG. 1, the die 10 is directly attached to the die 14, the upper die set 12 to which the knockout 16 is attached via the spring 18, the punch 22 is directly attached, and the pad 24 is attached to the spring 26. The lower die set 20 attached via the upper and lower sides is a drawing die facing in the vertical direction. The spring 26 corresponds to the biasing member of the present invention. The upper die set 12 corresponds to the die side die set of the present invention, and the lower die set 20 corresponds to the punch side die set of the present invention.

The upper die set 12 has a substantially rectangular shape which is engaged with a groove (not shown) formed on the lower surface of the upper die set 12 on the left and right sides of the die 14 so as to be movable in the left and right directions. A pair of lock cams 30 is provided.
A recess 31 is formed at the center in the height direction on the inner side surface of the lock cam 30 facing the die 14, and a protrusion 32 is formed above and below the recess 31. The width in the height direction of the recess 31 corresponds to the sum of the thickness in the height direction of the die 14, the thickness in the height direction of the pad 24, and the thickness of the material sandwiched between the die 14 and the pad 24. The size is assumed.
The outer side surface of the lock cam 30 in the left-right direction is a tilted surface 33 whose tip portion positioned below is inclined in the left-right direction from the inner lower portion to the outer upper portion, and the base portion of the outer side surface above the upper end of the inclined surface 33 Is a vertical surface 34.
On the side surface in the front-rear direction of the lock cam 30, a substantially rhombic release block 36 that protrudes with a constant thickness in the front-rear direction (the left-right direction in FIG. 2 in the side view) is formed at the front end portion in the left-right direction. ing. The upper surface of the release block 36 is a release inclined surface 38 that is inclined from the lower side in the left-right direction to the upper side in the left-right direction, and the side surface in the left-right direction of the release block 36 is a vertical surface 39. The lower side surface of the release block 36 is flush with the inclined surface 33 of the lock cam 30, and the lateral side surface of the release block 36 is flush with the vertical surface 34 of the lock cam 30.

In the lower die set 20, a pair of substantially rectangular cam drivers 40 are disposed on the left and right outer sides of the pad 24. The inner side surface facing the pad 24 of the cam driver 40 is an inclined surface 42 whose tip is inclined from the inner lower side to the outer upper side in the left-right direction, and the base portion of the inner side surface below the lower end of the inclined surface 42 is a vertical surface. 44. The inclination angle of the inclined surface 42 of the cam driver 40 is the same as the inclination angle of the inclined surface 33 of the lock cam 30. This cam driver 40 corresponds to the moving means of the present invention.
The lower die set 20 has a substantially L-shaped release with a tip projecting outward in the left-right direction between the pad 24 and the left and right cam drivers 40 on the front side and the rear side of the cam driver 40. Four drivers 46 are provided for convenience. A depression angle inclined surface 48 that forms a depression angle toward the tip is formed at the tip of the release driver 46 on the outer side in the left-right direction. The inclination angle 48 of the release driver 46 has the same inclination as the release inclination surface 38 of the release block 36 protruding from the lock cam 30. This release driver 46 corresponds to the return means of the present invention. The lower side of the depression angle inclined surface 48 is a vertical surface 49.
FIG. 3 is an external perspective view of the lock cam 30, the cam driver 40, and the release driver 46.

  The upper die set 12 is formed with an upper die recess 13 that can accommodate the tip of the release driver 46 disposed in the lower die set 20 when the drawing die 10 is clamped. Further, the lower die set 20 is formed with a lower die recess 21 that can accommodate the tip of the lock cam 30 engaged with the upper die set 12 when the drawing die 10 is clamped.

[Operation during mold clamping]
FIG. 4 shows the operation when the drawing die 10 is clamped. When the upper die set 12 approaches the lower die set 20, the inclined surface 33 of the lock cam 30 and the inclined surface 42 of the cam driver 40 come into contact with each other. Then, the inclined surface 33 of the lock cam 30 slides along the inclined surface 42 of the cam driver 40, and the lock cam 30 slides inward in the left-right direction of the aperture die 10. FIG. 4A shows a state in which the lock cam 30 is close to the die 14 and the pad 24. At this time, the material 28 is sandwiched between the die 14 and the pad 24 so that the die 14 and the pad 24 are in close contact with each other, and there is a gap between the punch 22 and the material 28. The release inclined surface 38 of the release block 36 of the lock cam 30 and the depression inclined surface 48 of the release driver 46 are not in contact with each other, and there is a slight gap therebetween.

When the upper die set 12 further approaches the lower die set 20 from the state of FIG. 4A due to the progress of mold clamping, the lock cam 30 further slides inward in the left-right direction of the aperture die 10. Then, the lower convex portion 32 of the concave portion 31 of the lock cam 30 enters the lower side of the pad 24, the upper convex portion 32 of the concave portion 31 of the lock cam 30 enters the upper side of the die 14, and the concave portion 31 of the lock cam 30 enters the concave portion 31. 14, the side of the material 28 and the pad 24 are sandwiched from above and below. Then, before the gap between the punch 22 and the material 28 disappears, the die 14, the material 28 and the side of the pad 24 are sandwiched from above and below in the recess 31 of the lock cam 30, and the die 14 and the pad 24 are fixed by the lock cam 30. It becomes.
When the mold clamping further proceeds, as shown in FIG. 4B, sliding between the inclined surface 33 of the lock cam 30 and the inclined surface 42 of the cam driver 40 is completed, and the inclined surface 33 and the vertical surface 34 of the lock cam 30 are finished. The boundary position and the boundary position between the inclined surface 42 and the vertical surface 44 of the cam driver 40 are in contact with each other. Then, while the die 14 and the pad 24 are fixed with the lock cam 30, the sliding of the lock cam 30 to the inner side in the left-right direction is completed. At this time, there is no gap between the punch 22 and the material 28, and the punch 22 is in contact with the material 28. The vertical surface 39 on the inner side in the left-right direction of the release block 36 of the lock cam 30 and the vertical surface 49 on the outer side in the left-right direction of the release driver 46 are not in contact with each other, and there is a gap between them.

When the mold clamping further proceeds from the state of FIG. 4B, the lock cam 30 in a state where the die 14, the material 28 and the pad 24 are sandwiched and fixed is lowered along the vertical surface 44 on the inner side in the left-right direction of the cam driver 40. Slide. Then, the punch 22 fixed to the lower die set 20 relatively pushes up the portion of the material 28 in contact with the punch 22 between the die 14 and the pad 24, and the drawing process of the material 28 proceeds.
FIG. 4C shows a state where the mold clamping is finished. At this time, the distal end of the lock cam 30 is accommodated in the lower die recess 21 formed in the lower die set 20, and the distal end of the release driver 46 is accommodated in the upper die recess 13 formed in the upper die set 12. It becomes a state.

[Operation at mold opening]
When the mold is opened, the lock cam 30 slides upward between the release driver 46 and the cam driver 40 with the die 14, the material 28 and the pad 24 sandwiched from the state shown in FIG. Then, the release inclined surface 38 of the lock cam 30 comes into contact with the depression angle inclined surface 48 of the release driver 46. When the mold opening further progresses, the release inclined surface 38 of the lock cam 30 slides along the depression angle inclined surface 48 of the release driver 46, the lock cam 30 moves outward in the left-right direction, and is sandwiched between the recesses 31 of the lock cam 30. The die 14, the material 28, and the pad 24 are detached from the lock cam 30. The lock cam 30 further moves outward in the left-right direction with the release inclined surface 38 in contact with the depression angle inclined surface 48 of the release driver 46 and returns to the original position.

[effect]
According to the aperture die 10 of the first embodiment, the die 14 and the pad 24 are sandwiched in the recess 31 of the lock cam 30 so that the gap between the die 14 and the pad 24 is kept constant, thereby serving as a cushion. Necessary pressure can be secured. Then, the lock cam 30 and the cam driver 40 slide relative to each other in the vertical direction and the mold clamping proceeds, so that the stroke height is secured.
Therefore, according to the aperture die 10, a cushion is not used on the outside of the die set, and a wrinkle pressing force that suppresses the generation of wrinkles and cracks can be generated between the pad and the die, and the stroke height is secured. An aperture die that can be provided can be provided.
Further, when the mold is opened, the release driver 46 can release the state in which the lock cam 30 sandwiches the die 14 and the pad 24 with a simple structure using the mold opening force.
And since the front-end | tip of the lock cam 30 and the release driver 46 is accommodated in the upper mold | type recessed part 13 and the lower mold | type recessed part 21 which were formed in each die set, the stroke of the aperture die 10 can be lengthened further.

[Modification]
In the above-described first embodiment, each die set is formed with a recess for accommodating the tip of the lock cam and the release driver. However, these recesses can be omitted. In addition, the upper and lower die sets can be reversed from the first embodiment, and the upper die set can be a punch die set and the lower die set can be a die die set.
In the first embodiment, the release driver is used as the return means, but the return means is not limited to the release driver. For example, a spring that generates a biasing force in the left-right direction may be interposed between the lock cam and the upper die set. According to this configuration, when the mold is clamped, the lock cam is slid inward in the left-right direction by the cam driver, and an urging force is generated on the spring so as to return to the position based on the lock cam. When the mold is opened, the lock cam can be returned to the original position in the left-right direction by the biasing force generated in the spring.
In addition, the drawing die according to the present invention can be implemented in various forms within the scope of the idea of the invention.

DESCRIPTION OF SYMBOLS 10 Diaphragm | die 12 Upper die set 13 Upper die recessed part 14 Die 16 Knockout 18 Spring 20 Lower die set 21 Lower mold recessed part 22 Punch 24 Pad 26 Spring 28 Material 30 Lock cam 31 Recess 32 Protruding part 33 Inclined surface 34 Vertical surface 36 Release block 38 Release inclined surface 39 Vertical surface 40 Cam driver 42 Inclined surface 44 Vertical surface 46 Release driver 48 Depression angle inclined surface 49 Vertical surface

Claims (3)

A punch die set to which a pad via a punch and a biasing member is attached and a die die set to which the die side die set to which the die is attached are opposed in the vertical direction,
The die-side die set is provided with a substantially rectangular lock cam that is movably engaged in the left-right direction on the left and right outer sides of the die.
The side surface of the lock cam facing the die is formed with a U-shaped recess having a substantially horizontal inner surface that can sandwich the die and the side of the pad from above and below. On the outer side, the tip is inclined and the base is vertical,
The aperture die includes a moving means for moving the lock cam inward in the left-right direction and a return means for returning the lock cam to its original position.
The moving means is a substantially rectangular cam driver disposed on the left and right outside of the pad of the punch-side die set,
The side of the cam driver facing the pad has an inclined tip and a vertical base.
During the clamping operation of the drawing die, the inclined surface of the cam driver and the inclined surface of the lock cam are in contact with each other with a gap between the punch and the material sandwiched between the die and the pad. The lock cam slides inward in the left-right direction, and before the gap between the punch and the material disappears, the side of the die and the pad is sandwiched and fixed in the recess of the lock cam from the vertical direction, With the lock cam fixed to the die and the pad, the lock cam has finished sliding inward in the left-right direction, and the vertical surface of the cam driver is in contact with the vertical surface of the lock cam.
A diaphragm in which the lock cam and the cam driver slide relative to each other in the vertical direction and the mold clamping proceeds in a state where the cam driver is in contact with the lock cam sandwiching the die and the pad from the outside in the lateral direction. Type. The drawing die according to claim 1,
The return means is a substantially L-shaped release driver disposed between the pad of the punch-side die set and the cam driver and having a tip portion projecting outward in the left-right direction. The tip portion is formed with a depression angle inclined surface that becomes a depression angle toward the tip,
The lock cam is formed with a release inclined surface that can come into contact with the depression inclined surface of the release driver,
When the die is opened, the depression inclined surface of the release driver and the release inclined surface of the lock cam come into contact with each other so that the lock cam slides outward in the left-right direction and returns to the original position. . The drawing die according to claim 2,
The die side die set is formed with a recess capable of accommodating the tip of the release driver, and the punch side die set is formed with a recess capable of accommodating the tip of the lock cam. Characteristic drawing die.

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