JP3518336B2 - Negative angle mold - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for forming a negative angle on a work. In the case where a negative angle is formed at the end of a work, for example, the work is placed on a lower mold having a negative angle forming portion projecting in the horizontal direction. The cam slides toward the negative angle forming portion, and the end of the workpiece is sandwiched between the lower die negative angle forming portion and the cam. As a result, the end of the work
It is bent along the negative angle forming section to form a negative angle. To remove the work from the mold after forming the negative angle, slide the lower mold in the direction away from the negative angle formed at the end of the work, and move the lower die into the negative end forming part of the lower mold. After disengaging from the lower mold, the work is removed. However, for example, as shown in FIG. 8, end portions wa and w extending in three different directions are provided.
When forming a negative angle on each end of a workpiece having a shape having b and wc in the order of wb, wc, and wa, when the lower die is slid after forming a negative angle on wa, the former is formed. The lower die 100 is attached to the work ends wb and wc having a negative angle.
However, there is a problem that they interfere. The object of the present invention is
An object of the present invention is to provide a negative angle forming die that can slide the lower die without interfering with the work after forming a negative angle at the end of the work. [0004] The present invention to achieve the above object is as follows. A lower die on which the work is placed, and an upper die that can be driven up and down in opposition to the lower die, wherein the lower die forms a negative angle at a part of the end of the work. A first guide cam having a first negative angle forming portion, the first guide cam being slidably biased horizontally so that the first negative angle forming portion moves away from a part of the end of the work; A second negative angle forming portion adjacent to the first negative angle forming portion for forming a negative angle at an end portion adjacent to a part of an end portion of the work;
The contact surface of the negative angle forming portion with the first negative angle forming portion is a slope inclined with respect to the sliding direction of the first guide cam, and the second negative angle forming portion is formed along the slope. A second guide cam disposed above the first guide cam urged horizontally slidably away from an end adjacent to a part of the end of the work; The upper die includes a first upper suspension cam that can move forward and backward toward the first negative angle forming portion of the first guide cam, and the second negative angle forming portion of the second guide cam. A second upper suspension cam capable of moving forward and backward, and sliding and contacting the first guide cam to stop horizontal sliding of the first guide cam.
The first guide cam slides at right angles to the slide direction.
A first cam stroke plate having a contact surface, and a slide guide for sliding the second guide cam to stop sliding in the horizontal direction, the slide guide being substantially in the sliding direction of the second guide cam. A second cam stroke plate having an orthogonal sliding / contact surface, and a length in which the sliding / contact surface of the first cam stroke plate slides / contacts with the first guide cam. The length of the second cam stroke plate that slides and contacts the second guide cam on the sliding and contact surface is longer than the first cam stroke when the upper die is driven upward. A negative angle forming in which the sliding and contact of the second cam stroke plate with the second guide cam is released before the sliding and contact of the plate with the first guide cam is released. Type. [0005] In the negative angle forming die of the present invention, the sliding / contact length of the sliding / contact surface of the first cam stroke plate with the first guide cam is the sliding / contact length of the second cam stroke plate. Since the contact surface is longer than the sliding / contact length of the second guide cam, the upper die is driven downward toward the lower die, and the first negative angle forming portion and the first upper suspension cam and When the upper die is driven upward after the negative angle is formed at the end of the work by the second negative angle forming portion and the second upper suspension cam, first, the second cam stroke plate of the second cam stroke plate is driven. The sliding and contact with the second guide cam are released, and the second negative angle forming portion of the second guide cam is moved along the slope of the first negative angle forming portion to form the end of the negative angle formed work. Slides horizontally away from the first part, and then slides with the first guide cam of the first cam stroke plate. - contact is released, the first negative angle forming portion of the first guide cam, a negative angle to slide horizontally towards away from the end portion of the work that has been molded. At this time, the first guide cam slides in the horizontal direction with the second guide cam arranged above, so that the second guide cam is moved in the same direction according to the slide of the first guide cam. Therefore, first, since the first negative angle forming section and the second negative angle forming section slide with a time lag, the contact surface between the first negative angle forming section and the second negative angle forming section becomes the first negative angle forming section. In the case of a slope inclined toward the side, the second guide cam which starts sliding in the horizontal direction first slides along the slope toward the first guide cam, so that the first negative angle forming portion and the second Since the apparent length of the negative angle forming portion becomes shorter, when the first guide cam and the second guide cam slide after the negative angle is formed, the first negative angle forming portion and the second The problem that the negative angle forming part interferes with the part around the end of the work where the negative angle is formed can be prevented. FIG. 1 shows a negative angle mold according to an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 shows the lower die of the negative angle forming die of the embodiment of the present invention, and FIG. 2 shows the upper die descending to the first guide cam of the negative angle forming die of the embodiment of the present invention to form a negative angle on the work. FIG. 3 shows a cross section in a state where the lower die is lowered to the second guide cam of the negative angle forming die of the embodiment of the present invention to form a negative angle on the work, and FIG. 5 to 7 show a sliding direction of a part of the negative angle forming die according to the embodiment of the present invention after negative angle forming. FIGS. 1 to 4 show a negative angle mold according to an embodiment of the present invention.
As shown in FIG. Lower mold 10
Has a first guide cam 20 and a second guide cam 30. The first guide cam 20 has a base 21 disposed on the lower die 10 via a plurality of slide plates 41 and extending horizontally, and a front part of the base 21 (a side on which a workpiece is placed is referred to as a front part. ), A negative-angle forming portion (first negative-angle forming portion) 22 protruding upward from the center, an upper suspension cam receiving portion 23 protruding upward from the center of the base 21, and protruding upward from a rear portion of the base 21. And a sliding portion 24. First guide cam 20
Is slidably urged horizontally by a return spring 1. The biasing direction is a direction in which the negative angle forming part 22 moves away from the end of the work. Further, the first guide cam 20 is provided on the lower mold when the first guide cam 20 slides by a predetermined amount in the biasing direction.
It comes into contact with a stopper (not shown) and stops. The negative angle forming portion 22 has a corner portion 22a at the rear portion for forming a negative angle at the end of the work. The upper suspension cam receiving portion 23 is provided with a negative angle forming portion 22.
The front surface opposing the corner 22a of the first member 22 at an interval is a slide surface 23a inclined upward from the lower portion toward the rear. The sliding portion 24 has a first guide cam 2
And a guide surface 24b connected to the upper end of the slide surface 24a and inclined upward and rearward from the upper end of the slide surface 24a. The second guide cam 30 is a first guide cam 2
0, a base 31 arranged horizontally via a slide plate 43, a negative angle forming part (second negative angle forming part) 32 projecting upward from a front part of the base 31, and a central part of the base 31. And a sliding portion 34 projecting upward from the rear portion of the base 31. The second guide cam 30 is urged by the return spring 2 so as to be slidable horizontally. The biasing direction is a direction in which the negative angle forming part 32 moves away from the work, and the contact surfaces 8a of the negative angle forming part 22 of the first guide cam 20 and the negative angle forming part 32 of the second guide cam 30 contact each other. 8b is a direction parallel to the slope 8 of FIG. Further, when the second guide cam 30 slides by a predetermined amount in the biasing direction, it comes into contact with a stopper (not shown) provided on the base 21 of the first guide cam 20 and stops. The negative angle forming part 32 is adjacent to the negative angle forming part 22 of the first guide cam 20. In addition, the rear portion has a corner 32a for forming a negative angle at the end of the work. The upper suspension cam receiving portion 33 includes a negative angle forming portion 32.
The front surface facing the corner portion 32a of the first portion at an interval is a slide surface 33a inclined upward from the lower portion to the rear portion. The sliding portion 34 has a second guide cam 3
The sliding surface 34a is substantially perpendicular to the sliding direction 0, and has a guide surface 34b connected to the upper end of the sliding surface 34a and inclined rearward and upward from the upper end of the sliding surface 34a. Further, the negative angle forming portion 2 of the first guide cam 20
The contact surfaces 8a and 8b of the negative angle forming portion 32 of the second and second guide cams 30 are inclined surfaces 8 and are inclined with respect to the sliding direction of the first guide cam 20. For example, as shown in FIG. 1, the angle between the biasing direction (sliding direction) of the first guide cam 20 and the slope 8 is an acute angle. The upper die 50 includes a first upper suspension cam 60, a second upper suspension cam 70, a first cam stroke plate 80, and a second cam stroke plate 90. The first upper suspension cam 60 is the first guide cam 2
And a bent portion 61 for forming the end of the workpiece to a negative angle at the lower front end.
And a slide surface 23 of the first guide cam 20 on a lower portion of the rear surface.
a, and a slide plate mounting surface 62 parallel to a. The slide plate 42 is provided on the mounting surface 62.
Is attached. The first upper suspension cam 60 is attached to the upper die 50 via the return spring 3. Upper mold 5
The surface 51 to which the first first hanging cam 60 is attached is inclined rearward and downward. When the upper die 50 is driven downward, the slide plate 42 attached to the first upper suspension cam 60 moves the slide surface 23 of the first guide cam 20.
a, and the bent portion 61 of the first upper suspension cam 60 advances toward the corner 22a of the negative angle forming portion 22 of the first guide cam 20, and the end of the work is moved to the corner 22a. Bend along the shape. The second upper suspension cam 70 is the second guide cam 3
0, which is located above the upper hanging cam receiving portion 33, and which is formed at the lower front end portion to form the end of the work at a negative angle.
And a slide surface 33 of the second guide cam 30 on the lower portion of the rear surface.
a mounting surface 72 of a slide plate parallel to a. The slide plate 44 is mounted on the mounting surface 72. The second upper suspension cam 70 is the upper die 5
It is attached via a return spring 4 to zero. Upper mold 50
The surface 52 on which the second upper suspension cam 70 is mounted is horizontal. When the upper die 50 is driven downward,
The slide plate 44 attached to the second upper suspension cam 70 slides on the slide surface 33a of the second guide cam 30, and the corner 32a of the negative angle forming part 32 of the second guide cam 30.
The bending portion 71 of the second upper suspension cam 70 advances toward the edge, and the end of the work is bent toward the corner 32a. The first cam stroke plate 80 is disposed at the rear of the first projection 53 projecting downward from the upper die 50. The first cam stroke plate 80 slides on and contacts the first guide cam 20 so that the first guide cam 20
And a slide / contact surface 80a substantially perpendicular to the slide direction of the first guide cam 20, and a guide surface 80 inclined forward from the lower end of the slide / contact surface 80a.
b. The second cam stroke plate 90 is disposed at the rear of the second projection 54 projecting downward from the upper die 50. The length from the upper end of the upper mold 50 to the lower end of the second protrusion 54 is equal to the length of the first protrusion 53 from the upper end of the upper mold 50.
Is shorter than the length up to the lower end. The second cam stroke plate 90 slides and contacts the second guide cam 30 to stop the horizontal slide of the second guide cam 30, and slides substantially perpendicular to the slide direction of the second guide cam 30. It has a moving / contact surface 90a and a guide surface 90b inclined forward from the lower end of the sliding / contact surface 90a. The position of the upper end of the sliding surface 24a of the sliding portion 24 of the first guide cam 20 corresponds to the position of the sliding portion 3 of the second guiding cam 30.
4 is lower than the upper end position of the sliding surface 34a. Further, the length of the sliding surface 24a of the sliding portion 24 of the first guide cam 20 and the length of the sliding / contact surface 80a of the first cam stroke plate 80 are substantially equal. Further, the length of the sliding surface 34a of the sliding portion 34 of the second guide cam 30 and the length of the sliding / contact surface 90a of the second cam stroke plate 90 are substantially equal. The length of the first cam stroke plate 80 is longer than the length of the second cam stroke plate 90. As a result, the length of the sliding / contact surface 80a of the first cam stroke plate 80 sliding / contacting with the first guide cam 20 is equal to the length of the second cam stroke plate 9
0 slide / contact surface 90a slides with the second guide cam 30.
When the upper die 50 is driven upward, the second cam stroke is released before the sliding and contact of the first cam stroke plate 80 with the first guide cam 20 is released. Second guide cam 30 of plate 30
Sliding and contact with are released. When the upper die 50 is driven downward, the first cam stroke plate 80
Prior to the sliding and contact with the first guide cam 20, the sliding and contact of the second cam stroke plate 90 with the second guide cam 30 are performed. The length (distance or time) at which the sliding / contact surface 80a of the first cam stroke plate 80 slides / contacts with the first guide cam 20 is determined by the length of the sliding / contact of the first cam stroke plate 80. The length of the contact surface 80a, the sliding / contact surface 80 of the first cam stroke plate 80 from the upper end of the upper die
a, the length from the lower end of the lower mold to the upper end of the sliding surface 24a of the first guide cam, and the length of the sliding surface 24a of the first guide cam. The length (distance or time) at which the sliding / contact surface 90a of the second cam stroke plate 90 slides / contacts with the second guide cam 30 is:
Sliding / contact surface 90 of second cam stroke plate 90
a, the length from the upper end of the upper die to the lower end of the sliding / contact surface 90a of the second cam stroke plate 90, and the length from the lower end of the lower die to the upper end of the sliding surface 34a of the second guide cam. The length and the length of the sliding surface 34a of the second guide cam can be adjusted. Next, a method of forming a negative angle at the end of the work using the negative angle forming die of the embodiment of the present invention will be described together with the operation of the negative angle forming die of the embodiment of the present invention. In reference to,
explain. First, a work W having ends a, b, and c extending in three directions is placed above the lower mold 20. At this time, a part a1 of the end a of the work W is in the negative angle forming part 22 of the first guide cam 20, and an end a2 adjacent to the part a1 of the end a of the work W is in the first position. It is located in the negative angle forming part 32 of the second guide cam 30 adjacent to the negative angle forming part 22 of the guide cam. Next, the upper die 50 is driven downward. As the upper die 50 is driven downward, first, the guide surface 90b of the second cam stroke plate 90 comes into contact with and slides on the guide surface 34b of the sliding portion 34 of the second guide cam 30. Then, the second guide cam 30 urged by the return spring 2 gradually slides backward against the urging force. The sliding / contact surface 90a of the second cam stroke plate 90 is the sliding surface 34 of the sliding portion 34 of the second guide cam 30.
When the second guide cam 30 starts sliding with a, the sliding of the second guide cam 30 stops. As the upper die is driven downward, the slide plate 44 also comes into contact with the slide surface 33a of the upper suspension cam receiving portion 33 of the second guide cam 30 that is gradually sliding rearward. Touch and slide down. When the slide / contact surface 90a of the second cam stroke plate 90 slides and contacts the slide portion 34 of the second guide cam 30, and the slide of the second guide cam 30 is stopped, the second The upper suspension cam 70 resists the urging force of the return spring 4,
The sliding surface 33a of the upper suspension cam receiving portion 33 continues to slide downward, and at the same time, the shift bending portion 71 is moved to the end a of the work W.
1 is a corner portion 22a of the negative angle forming portion 22 of the second guide cam 30.
To form a negative angle. The upper die 50 is driven downward, and the guide surface 90b of the second slide plate 90 is
The first cam stroke plate 80 abuts against the guide surface 34a of the sliding portion 34 of the first
Guide surface 80b abuts on the guide surface 24a of the sliding portion 24 of the first guide cam 20, and slides. Then, the first guide cam 20 urged by the return spring 1 gradually slides backward against the urging force. The sliding and contact surface 80a of the first cam stroke plate is
When sliding starts on the sliding surface 24a of the sliding portion 24,
Of the guide cam 20 stops. The first upper suspension cam 60 also contacts the slide surface 23a of the upper suspension cam receiving portion 23 of the first guide cam 20, in which the slide plate 42 is gradually sliding rearward as the upper die is driven downward. , Slide down. When the sliding / contact surface 80a of the first cam stroke plate 80 slides and contacts the first guide cam and the sliding of the first guide cam 20 is stopped, the first upper suspension cam 60 Against the urging force of the return spring 3, the sliding surface 23a of the cam sliding portion 23 continues to slide downward, and at the same time, the approach bending portion 61 is moved to the end a2 of the work.
Is bent along the corner 22a of the negative angle forming portion 22 of the first guide cam 20 to form a negative angle. The negative angle forming part 22 of the first guide cam 20 and the negative angle forming part 32 of the second guide cam 30 when a negative angle is formed at the work end a.
Are as shown in FIG. After the negative angle is formed at the end of the work, the upper die 50 is driven upward. As the upper die 50 is driven upward, the sliding / contact surface 80a of the first cam stroke plate 80 moves upward while the upper die is driven while sliding on the sliding portion 24 of the first guide cam 20. And then the second
The sliding / contact surface 90a of the cam stroke plate 90 moves upward as the upper die is driven upward while sliding with the sliding portion 34 of the second guide cam 30. While the sliding / contact surface 80a of the first cam stroke plate 80 is sliding with the sliding surface 24a of the sliding portion 24 of the first guide cam 20, the first guide cam 20 is in the horizontal direction. Since the slide is stopped, the first upper suspension cam 60 is connected to the return spring 3.
The slide plate 42 slides on the slide surface 23a of the upper suspension cam receiving portion 23 while moving in the biasing direction, and moves upward as the upper die is driven upward. The second upper suspension cam 70 is the same as the first upper suspension cam 60. Sliding of the second cam stroke plate 90
While the contact surface 90a slides on the sliding surface 34a of the sliding portion 34 of the second guide cam 30, the second guide cam 30 stops sliding in the horizontal direction. The slide plate 44 slides on the slide surface 33a of the upper suspension cam receiving portion 33 while moving in the biasing direction by the biasing force of the return spring 4, and the upper suspension cam 70 moves upward with the upper die. When the upper die 50 is further driven upward, the guide surface 90b of the second cam stroke plate 90 and the guide surface 34b of the sliding portion 34 of the second guide cam 30 begin to slide. Of the first guide cam 20 toward the first guide cam 20 along the slope 8a of the first guide cam 20, as shown in FIG. The negative angle forming part 32 is separated from the end a1 of the work in which the negative angle is formed. Further, when the upper die is driven upward, the second cam stroke plate 90 is released from contact with the sliding portion 34 of the second guide cam 30, and the second guide cam comes into contact with a stopper (not shown). Slide forward until they touch. The length at which the sliding / contact surface 80a of the first cam stroke plate 80 slides / contacts the first guide cam 20 is equal to the length of the sliding / contact surface 90a of the second cam stroke plate 90. Since the second guide cam 30 slides forward in the biasing direction of the return spring 2 while the upper die 50 is being driven upward, since the second guide cam 30 is longer than the length in which the second guide cam 30 slides and contacts the second guide cam 30. The guide surface 80b of the first cam stroke plate 80 and the guide surface 24b of the sliding portion 24 of the first guide cam 20 start sliding, and the first guide cam 20 is gradually moved by the urging force of the return spring 1. Sliding forward, as shown in FIG. 7, the negative angle forming part 22 separates from the end a2 of the work in which the negative angle is formed. When the first guide cam slides, the second guide cam 30 disposed above the first guide cam is stopped by a stopper (not shown). Is moved in the sliding direction. When the upper die is further driven upward, the contact between the first cam stroke plate 80 and the sliding portion 24 of the first guide cam 20 is released, and the first guide cam 20 is moved to a stopper (not shown). Slide until it touches. When a negative angle is formed at the end a of the work, the end of the work is entangled in the negative angle forming portions 22 and 32 of the first and second guide cams. First
It is difficult to remove the negative angle forming portion 22 of the first guide cam 20 and the negative angle forming portion 32 of the second guide cam 30 from the workpiece. The workpiece can be easily removed by sliding the workpiece away from the workpiece. In addition, the first guide cam 20 and the second guide cam 30 do not slide at the same time.
2 only slides away from the end of the work and slides toward the first guide cam 20 along the slope 8a of the negative angle forming portion 22 of the first guide cam 20.
Slides in a direction urged by the return spring 1, which is different from the sliding direction of the second guide cam 30, with the second guide cam 30 mounted thereon. As the second guide cam 30 slides toward the first guide cam, the apparent lengths of the negative angle forming portion 22 of the first guide cam 20 and the negative angle forming portion 32 of the second guide cam 30 become smaller. Since the negative angle is shorter than the length of the end a of the formed work, the first guide cam 20 and the second guide cam 30 may interfere with the other ends b and c of the work W when sliding. Can be prevented. According to the negative angle forming die of the present invention, the sliding / contact length of the sliding / contact surface of the first cam stroke plate with the first guide cam is the second cam stroke. When the upper die is driven upward after the negative angle is formed, since the sliding / contact length of the sliding / contact surface of the plate with the second guide cam is longer than the second cam, The sliding and contact of the stroke plate with the second guide cam is released,
The second negative angle forming portion of the guide cam slides horizontally along the inclined surface of the first negative angle forming portion away from the end of the workpiece having the negative angle formed, and then the first negative angle forming portion. The sliding and contact of the cam stroke plate with the first guide cam is released, and the first negative angle forming portion of the first guide cam moves horizontally away from the end of the negative angle formed work. Slide in the direction. At this time, the first guide cam slides in the horizontal direction with the second guide cam arranged above, so that the second guide cam is moved by the first guide cam. Since the first negative angle forming portion and the second negative angle forming portion can slide in different directions with a time difference, the second guide cam which starts sliding in the horizontal direction first is moved toward the first guide cam. By sliding, the apparent lengths of the first negative angle forming section and the second negative angle forming section become shorter, so that the first negative angle forming section and the second negative angle forming section reduce the negative angle. It is possible to prevent a problem that the first guide cam and the second guide cam interfere with each other around the end portion of the formed work when the first guide cam and the second guide cam slide.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lower mold of a negative angle forming die according to an embodiment of the present invention. FIG. 2 is a diagram showing a sectional view taken along line AA of FIG. 1 together with an upper mold. FIG. 3 is a diagram showing a sectional view taken along line BB of FIG. 1 together with an upper mold. FIG. 4 is a sectional view taken along line CC of FIG. 1; FIG. 5 is a diagram illustrating a state of a guide cam after a negative angle is formed at an end of a work using the negative angle forming die according to the embodiment of the present invention. FIG. 6 is a view showing a state in which a second guide cam slides after forming a negative angle at the end of the work using the negative angle forming die according to the embodiment of the present invention. FIG. 7 is a view showing a state where the first guide cam slides after forming a negative angle at the end of the work using the negative angle forming die of the embodiment of the present invention. FIG. 8 is a view for explaining a conventional negative angle forming method, and is a view showing a state where a lower die slides after forming a negative angle at an end of a work. [Description of Signs] 10 Lower mold 20 First guide cam 22 Negative angle forming part (First negative angle forming part) 30 Second guide cam 32 Negative angle forming part (Second negative angle forming part) 50 Upper Mold 60 First suspended cam 70 Second suspended cam 80 First cam stroke plate 80a Sliding / contact surface 90 Second cam stroke plate 90a Sliding / contact surface

Claims (1)

(57) [Claim 1] A lower die on which a work is placed, and an upper die which can be driven up and down opposite to the lower die, wherein the lower die is A first negative angle forming part for forming a negative angle at a part of the end of the work, and horizontally sliding in a direction in which the first negative angle forming part moves away from a part of the end of the work; A first guide cam biased as possible, and a second negative angle forming adjacent to the first negative angle forming portion for forming a negative angle at an end adjacent to a part of an end of the work. A contact surface of the second negative-angle forming portion with the first negative-angle forming portion is a slope inclined with respect to a sliding direction of the first guide cam, and is formed along the slope. A second negative angle forming part is disposed above the first guide cam urged horizontally slidably away from an end adjacent to a part of the end of the work. A second guide cam, wherein the upper die is capable of moving back and forth toward the first negative angle forming portion of the first guide cam; and A second upper suspension cam which can be advanced and retracted toward the second negative angle forming portion of the first guide cam; and a horizontal direction of the first guide cam which slides and comes into contact with the first guide cam. The first guide cam having a sliding / contact surface substantially perpendicular to the sliding direction of the first guide cam.
And a slide / contact substantially perpendicular to the slide direction of the second guide cam, which slides and contacts the second guide cam to stop horizontal slide of the second guide cam. Second with surface
And the length of the slide / contact surface of the first cam stroke plate that slides / contacts with the first guide cam is determined by the second cam stroke plate. The length of the sliding / contact surface is longer than the length of sliding / contacting with the second guide cam, and when the upper die is driven upward, sliding of the first cam stroke plate with the first guide cam is performed. Before the movement / contact is released, the second cam stroke plate
A negative angle mold that releases sliding and contact with the guide cam.