JP2015098045A - Forced set mechanism and forced set method for rotary body, and negative angle molding mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forced set mechanism for a rotary body, which solves the problem that the conventional design of a cam mechanism for each product not only has raised a production cost and elongated the time for delivery and but also has made not a surface contact but a line contact so that the cam surface might exert adverse effect on the rotation.SOLUTION: A forced set mechanism forcedly sets through a cam mechanism in a mold rotary body to be rotated in the state at a work-piece working time by drive means so that the rotary body may be maintained in the state at the working time. In the forced set mechanism 1 for the rotary body, in order to set the contact state of cam faces 2a and 5a in the cam mechanism into a line contact, at least one cam face is formed into a curved face shape.

Description

  The present invention relates to a forced setting mechanism of a rotating body, a forced setting method thereof, and a negative angle forming mold in a press forming mold for negative angle forming in which a panel edge of an automobile or the like is bent into a complicated shape. Is.

  2. Description of the Related Art Conventionally, in a press-molding mold for negative angle molding of a rotating method, for example, in the case of an upper cam-type press-molding mold 20, as shown in FIG. ) When the upper processing cam 22 descends from the top dead center and reaches the bottom dead center, the rotating body 21 that rotates clockwise around the point by driving means such as an air cylinder, as shown in FIG. After the upper machining cam 22 comes into contact with the upper surface of the right half of the rotating body 21, it is pushed leftward in the figure. Then, the end portion of the work W pressed by the rotating body 21, the backup block 24, and the upper pad 23 is bent by the bending blade 22 a of the upper processing cam 22.

  In the press molding die 20, for example, even when there is a malfunction in an air cylinder or the like and the rotating body 21 is not set, the upper processing cam 22 fixed to the upper die body (not shown) The rotating body 21 is forcibly rotated clockwise and set. The upper cam system has such advantages. As an example of this prior application, a mold described in Patent Document 1 is known.

In contrast to the upper cam system, there is a lower cam system as shown in FIG. This is because the upper cam system described above has the following disadvantages:
1: Suspending a large and heavy upper processing cam on the upper mold body is dangerous because it may fall.
2: Before the pressing of the upper pad 23 presses the rotating body 21, it is necessary to set the rotating body 21 using the upper processing cam 22, and the stroke of the upper processing cam 22 becomes longer in order to realize this. , Mold manufacturing costs will increase,
3: When the upper machining cam 22 descends with a large stroke, it is in the way of conveying the workpiece W.

On the other hand, in the lower cam system, as shown in FIG.
1: After moving back to a position that does not interfere with the rotation of the rotating body 21 and then moving forward, the rotating body 21 is damaged.
2: As shown in FIG. 6B, the stroke S1 of the lower machining cam 25 becomes too large, and the cam mechanism may not be structurally established.
3: As shown in FIG. 6A, when the stroke S2 of the lower machining cam 25 is reduced, the rotating body 21 is prevented from rotating counterclockwise by the machining pressure P of the lower machining cam 25. There is a problem that needs to be considered.

  Therefore, when the lower cam system is adopted, as shown in FIG. 6A, an air cylinder 26 as a driving means for rotating the rotating body 21 to the processing position is provided, and the rotating body 21 is not rotated reversely. A forced set mechanism is required. For this purpose, for example, as shown in FIGS. 7A and 7B, an upper-type forced block 27 that moves linearly and a forced block 21b of a rotating body 21a that moves rotationally are connected to each other between cam surfaces 27a and 21c. In contact with the straight portions 27b and 21d to prevent reverse rotation (counterclockwise rotation) of the rotating body 21a. As an example of the lower cam system, a mold described in Patent Document 2 is known.

JP 09-122759 A JP 2003-117608 A

  However, when the cam surfaces 27a and 21c that are inclined with respect to each other are in contact with each other, the planes come into contact with each other for a moment. As shown in FIG. 7C, when the rotating body 21a rotates even slightly, It becomes line contact. Further, even when the flat surfaces are in contact with each other, it is practically impossible for the angles of the flat surfaces to coincide with each other in consideration of a molding angle of the mold and an assembly error.

  As described above, the cam surfaces 27a and 21c of the upper-type forced block 27 and the rotating body 21a are set under the same design concept as the movable cam mechanism, and the inclined surface is designed by a custom order each time. Therefore, not only the design cost is increased and the delivery time of the mold is lengthened, but also there is a problem that the cam surface inclined with respect to the line contact hinders the smooth rotating operation of the rotating body. The forced setting mechanism and forced setting method of a rotating body and a negative angle molding die according to the present invention have been proposed in order to solve such problems.

  The gist of the present invention for solving the above-mentioned problem of the forced setting mechanism of the rotating body according to the present invention is to provide a rotating body of a mold that is rotated by a driving means to a state at the time of workpiece processing. In the forced setting mechanism for forcibly setting the rotating body via the cam mechanism so as to be maintained at least, the cam surface in the cam mechanism has at least one curved surface so as to make a line contact. It is.

  The curved surface shape is any one of a curved surface shape that is a part of a circle having a radius r, a curved surface shape that is a part of an elliptic curve, and a curved surface shape that is a part of a known curve other than these. That is.

  The curved cam surface is provided on the cam surface on any one of the rotating body side, the upper mold side, and the lower mold side.

  The gist of the method for forcibly setting the rotating body according to the present invention is that the forced setting mechanism of the rotating body is formed and provided in a mold, and after the rotating body is rotated to a processing position by a driving means by this mold, the rotating body is rotated. The moving body is forced to be set so as not to reversely rotate due to pressing during processing.

  The gist of the negative angle mold according to the present invention is that the mold is provided with the forced setting mechanism of the rotating body.

  According to the forced setting mechanism of the rotating body of the present invention, the cam surface of the inclined plane and the cam surface of the curved shape, or the cam surfaces of the curved shapes are in line contact from the beginning of the contact, Forcibly set to the bending position. In addition, since the rotating body is driven by a driving means such as an air cylinder and is set in the state at the time of processing and makes a line contact, a large force is not applied to the line contact portion of the cam surface. Even when the driving is not performed normally, the rotating body smoothly rotates and is set by the curved cam surface of the forced setting mechanism.

In addition, the curved cam surface facilitates cam design, unifies the components of the forced rotation mechanism into several types, and greatly reduces the design cost. Die delivery time is also shortened. There are many excellent effects that the design mistakes that are often found in conventional mold design are eliminated and maintenance is easy.
By providing the forced setting mechanism of the rotating body, the forced setting method is easy to design and the manufacturing cost is reduced, and the forced setting mechanism is suitable for the lower cam system of the negative angle forming mold having a swing die. .

It is a partial longitudinal cross-sectional view which shows the outline of the forced setting mechanism of the rotary body which concerns on this invention. It is a partial longitudinal cross-sectional view of the state which set the rotation body by the forced setting mechanism of the rotation body of the same invention. It is an expansion detailed longitudinal cross-sectional view which expands and shows the curved surface shape of the forced block in the forced set mechanism of the rotary body which concerns on the same invention. It is a longitudinal cross-sectional view which expands and shows a part of negative angle shaping die of the upper cam system which concerns on a prior art example. It is a longitudinal cross-sectional view which shows a mode that the processing cam 22 same as the above reaches a bottom dead center, moves further to the left side, and processes the workpiece | work W. It is the longitudinal cross-sectional view (A) which expands and shows a part of lower-cam type negative angle shaping | molding metal mold | die concerning the prior art example, and the longitudinal cross-sectional view (B) of an example with long stroke S1. In the forced setting mechanism according to the conventional example, a longitudinal sectional view (A) in a state of moving from a top dead center to a bottom dead center, a longitudinal sectional view (B) in a state in which the rotating body 21a is forcedly set, and a cam surface It is a longitudinal cross-sectional view (C) which shows the state which 27a and 21c line-contacted.

  As shown in FIG. 1, the forced setting mechanism 1 of the rotating body according to the present invention is a cam mechanism in which a linearly moving mold and a rotating movable mold (rotating body) are in contact with each other. The cam surface 2a is formed in a curved shape such as a radius r, for example.

  The forced setting mechanism 1 according to the present invention will be described. For example, as shown in FIG. 1, in a negative angle forming mold, a rotating body 3 of a mold that is rotated to a workpiece processing state by a driving means such as an air cylinder is maintained in the processing state. In the forced setting mechanism 1 that is forcedly set by the forced blocks 2 and 5 that are slidably contacted with the rotating body 3 via the cam mechanism as described above, in order to bring the contact state of the cam surfaces 2a and 5a in the cam mechanism into line contact, The cam surface 5a is an inclined flat surface, and the other cam surface 2a in contact with the inclined flat surface is curved.

  As shown in FIG. 3, the curved surface shape of the cam surface 2a is a curved surface shape (a) that is a part of a circle having a radius r, a curved surface shape (b) that is a part of an elliptic curve, and other known curves. Any one of the curved surface shapes that are part of. Examples of other known curves include a sine curve, a cosine curve, a cycloid curve, and a spiral curve. Moreover, in principle, it is any one of the curves, but may be combined with other curves.

  Furthermore, as shown in FIGS. 2 to 3, the curved surface shape is such that the end portion of the curved cam surface 2 a is tangent to the straight portion 2 b in the forced setting state at the corner portion that contacts the compulsory block. However, it is not limited to this.

  When the curved surface shape is a part of an ellipse, as shown in FIG. 3, the axis orthogonal to the straight line portion 2b from the center point 7 of the curved surface is a short axis and is parallel to the straight line portion 2b. The major axis is the long axis. This is because at the portion where the curved end is connected to the straight portion 2b, the curvature (1 / r) of the curved line is smoothly abutted against the other cam surface 5a. However, depending on the convenience of the mold, the long and short axes may be set to an elliptic curve (curve indicated by reference numeral (c) in FIG. 3) having a reverse relationship to that illustrated.

  The curved cam surface 2a is provided as an example with respect to the forced block 2 of the rotating body 3, but not limited to this, either the upper die 4 side or the lower die (not shown) side of the mold. It may be provided in the compulsory block 5 in one. The point is that the rotation (rotation in the counterclockwise direction) due to the pressing force during processing of the rotating body 3 only has to be prevented.

  In addition, the forced blocks 2 and 5 are shown as separate materials from the rotating body 3 and the upper mold 4 of the mold body, respectively, but the material is not limited to this, and the same material as the material of the mold body may be used. Further, the cam surface having a curved surface may have a curved surface shape in both the cam surface 5a that moves linearly and the cam surface 2a that rotates. This is because it is only necessary to realize line contact on the cam surface in the cam mechanism.

  A lower cam type mold having the forced setting mechanism 1 as described above is manufactured and prepared in a working mold, and as shown in FIG. 1, the rotating body 3 is an air cylinder 26 (see FIG. 6A), etc. 2, the rotating body 3 is forcibly set by the forcing blocks 2 and 5 so as not to reversely rotate by the pressing during the machining by the lower machining cam 25 as shown in FIG. To do.

  In the forced setting mechanism 1 according to the present invention, the upper die 4 for forced setting is lowered after the rotating body 3 is normally set by the driving means such as an air cylinder and the state shown in FIG. Therefore, a large force is not applied to the line contact portions on the cam surfaces 2a and 5a.

  Further, even if the drive means does not operate and does not operate normally, as shown in FIG. 1, the cam surfaces 2a and 5a of the forced blocks 2 and 5 are in line contact, so that the rotating body 3 is clockwise. And is forcibly set to the state during processing.

  Thus, the mold having the forced setting mechanism 1 can be a negative angle forming mold. This is because in the negative angle mold having the forced setting mechanism 1, the rotating body 3 can be forcibly set while the stroke S2 of the lower processing cam 25 is as short as possible by the lower cam method with respect to the swing die. . Of course, a processing mold composed of an upper mold and a lower mold for processing other than this may be used.

  The forced setting mechanism 1 eliminates the inconvenience of surface contact, which has been a problem in the past, and the angle design for each bending of the workpiece W is unified into several types, greatly reducing the design effort. It came to be. Therefore, it greatly contributed to the reduction of mold manufacturing costs.

  The forced setting mechanism 1 according to the present invention is a mechanism related to the contact between the cam surfaces of the linearly moving mold and the rotating rotating body. Further, it can be applied to other general processing molds.

1 Forced set mechanism,
2 forced block, 2a cam surface,
2b straight section,
3 rotating body,
4 Upper mold,
5 Forced block, 5a Cam surface,
6 Lower mold,
7 Center point,
20 Die for press molding,
21 rotating body, 21a rotating body,
21b forced block, 21c cam surface,
22 upper machining cam, 22a bending blade,
23 Upper pad,
24 Back-up block,
25 Lower processing cam,
26 Driving means (air cylinder),
27 Forced block, 27a Forced block.

Claims (5)

In a forced setting mechanism for forcibly setting a rotating body of a mold rotated to a state at the time of workpiece processing by a driving means to the rotating body via a cam mechanism so as to be maintained at the state at the time of processing,
In order to bring the contact state of the cam surface in the cam mechanism into line contact, at least one cam surface has a curved shape;
A forcible set mechanism for rotating bodies. The curved surface shape is any one of a curved surface shape that is a part of a circle having a radius r, a curved surface shape that is a part of an elliptic curve, and a curved surface shape that is a part of a known curve other than these. ,
The forced setting mechanism of the rotating body according to claim 1. The curved cam surface is provided on the cam surface on any one of the rotating body side, the upper die side, or the lower die side,
The forced setting mechanism of the rotating body according to any one of claims 1 to 2. A forcible set mechanism for a rotating body according to any one of claims 1 to 3 is formed to prepare a mold,
After rotating the rotating body to the processing position by the driving means with this mold, forcibly setting the rotating body so as not to reversely rotate by pressing during processing,
A method for forcibly setting a rotating body. A rotating die forcibly setting mechanism according to any one of claims 1 to 3 is provided in a mold.
A mold for negative angle molding.

Images