JP2003311347A - Rotary cam press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary cam press that causes no failures such as deflection or difference in level in the end part of a workpiece, even if negative angle forming is applied on a curved end part of the workpiece using a plurality of rotary cams. <P>SOLUTION: By a ball cutter, a cam groove 16a which is bent at two places is formed in the manner that three rotary cams 16 can be mounted on one cam base 14. Three punches 18 are similarly machined and fixed on this cam base 14. In the rotary cam press 10 having such structure, the rotary cams 16 and the punches 18 supporting a workpiece w are arranged on the common cam base 14; therefore, stable machining can be performed on the continuous end part of the workpiece, causing no seams or difference in level on a product. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cam type press device, and more specifically, a plurality of rotary cams are mounted on an integrated cam base, and the plurality of rotary cams bring the plate-shaped workpiece to a continuous end portion. The present invention relates to a rotary cam type press device that performs negative angle forming such as bending and punching.

[0002]

2. Description of the Related Art A rotary cam type press device equipped with a rotary cam is used to perform negative angle forming such as bending and punching on the end of a plate-shaped work. An example of the rotary cam type press device will be described with reference to FIG.
FIG. 5 is a vertical cross-sectional view of a main part at a press bottom dead center of an example of a rotary cam type press device that performs a bending process. In the rotary cam type press device 50, the rotary cam 56 is rotatably mounted in the cam groove 54 a formed in the cam base 54, and the cam base 54 is fixed to the lower die 52. A punch 58 is fixed on the cam base 54 and supports the lower surface of the work w together with the rotary cam 56. The upper surface of the work w is pressed downward by the pad 66 held by an upper mold holder (not shown) so as to be able to move up and down.
Is positioned. The processing cam 60 is held by the upper die holder so as to be able to move up and down and slidably held, and is guided to the rotary cam side by the slide plate 62 during processing. The machining blade 60a of the machining cam 60 abuts the machining surface 56a formed on the rotary cam 56 via the workpiece w to perform bending near the end of the workpiece w.

In this rotary cam type press device 50, the rotary cam 56 rotates clockwise in the drawing to support the work w during processing, and in this state, the work surface 56a formed on the rotary cam 56 is processed. w
Push the ends and bend them. Therefore, at the end of processing, if the rotary cam 56 is rotated counterclockwise in the direction opposite to that at the time of processing, it can be easily removed from the mold without interfering with the work w. Due to these advantages, the rotary cam type press device using the rotary cam is widely used when performing negative angle forming such as offset bending.

In the rotary cam type press device using the rotary cam, since the processing surface is formed to extend inward in the radial direction from the peripheral surface of the rotary cam, the end of the work is largely bent in the processing direction. In some cases, the work edge may not fit within the width of the machining surface of the rotary cam. In this case, as disclosed in Japanese Patent Laid-Open No. 6-344030, the end portion of the work becomes substantially linear,
Machining is possible by dividing the rotary cam at a position that fits within the width of the machining surface of the rotary cam and arranging the individual rotary cams in a linear shape so as to follow the shape of the work end.

An example of a rotary cam type press device for forming a negative angle on a bent work end will be described with reference to FIGS. 6 and 7. FIG. 6A is a side view of a work receiving portion of an example of a conventional rotary cam type press device, and FIG. 6B is a plan view thereof. FIG. 7 is a plan view of a cam base of the rotary cam type press device. The work receiving portion of the rotary cam type press device mentioned here indicates a portion on the side supporting the work from below. As shown in FIG. 6, the rotary cam 56 is divided into three. Further, as shown in FIG. 7, the cam base 54 is also divided into three parts, and a cam groove 54a is formed in each cam base 54. One rotary cam 56 is attached to each cam groove 54a, and each cam base 54 has a punch 5 attached thereto.
8 is fixed and unitized. The configuration and processing mechanism of each unit are the same as described above (see FIG. 5).

If it is desired to mount a plurality of rotary cams on one cam base without dividing the cam base as described above, the adjacent rotary cams are arranged in a polygonal line shape at a predetermined angle to the cam base. Will be done. That is, it is necessary to form a bent cam groove for mounting a plurality of rotary cams on the cam base.

A conventional method for forming a cam groove on the cam base will be described with reference to FIG. FIG. 8 is a schematic view of a conventional cam groove cutting method. First cam base 54
After the member to be the punch 58 is fixed to, the cam base 54 and the punch 58 are simultaneously cut by the machining tool 70 shown in the figure to form the cam groove 54a. This processing blade 70 is a rotary cam to which the blade portion 70a is attached later (see FIG. 5).
The cam groove 54a, which is the sliding surface of the rotary cam, is cut by moving axially while rotating coaxially with.

The moving direction of the processing blade is limited to one axial direction, and only a linearly extending cam groove can be processed, and a polygonal cam groove cannot be formed. Can not. Therefore, in order to arrange a plurality of rotary cams in a polygonal line, as shown in FIGS. 6 and 7, the cam base on which the rotary cams are mounted must be divided for each rotary cam and arranged in the lower mold in a polygonal line. . For this reason, in a rotary cam type press device for forming a negative angle on a bent work end, the cam base, the rotary cam, and the punch are regarded as one unit, and this unit is placed in a lower mold along the shape of the work end. They are arranged side by side so that they can be processed at once.

[0009]

However, if the cam base, the rotary cam, the punch, and the like are unitized and a plurality of sets of units are arranged side by side in the lower mold and individually fixed, a difference occurs in the force received by each unit during processing. Then, the bending amount and the deviation amount of the cam base are different for each unit, and the bending amount and the deviation amount of the punch and the rotary cam attached to the cam base also differ. If the punch or the rotary cam that supports the work is bent or displaced, the product is bent or a step is formed at the boundary between the adjacent units, which makes it difficult to ensure quality.

The present invention provides a rotary cam type press device which does not cause defects such as bending or step at the end of the work even when negative angle forming is performed on the end of the work bent by a plurality of rotary cams. The purpose is to do.

[0011]

Means, Actions and Effects for Solving the Problems A rotary cam type press device according to the present invention is provided with a work receiving part having a common cam base and a plurality of rotary cams, and a work receiving part by approaching the work receiving part. The common cam base is provided with a rotary cam groove in which a partial groove having a partial arcuate shape and extending linearly is formed continuously in a broken line shape. Is equipped with a rotary cam that rotates on a common cam base by its peripheral surface, and each rotary cam is formed with a processed surface extending radially inward from the peripheral surface.
When each rotary cam rotates to the processing angle, the processing surfaces of the rotary cams continuous in the longitudinal direction are continuous.

In a conventional rotary cam type press device having a plurality of rotary cams, a work base having a cam base and a rotary cam is unitized, and such units are arranged in a folded line shape in a lower die. But,
Since each of these units is independent, when a force is applied during processing, each unit shifts or bends, resulting in a seam or a step on the work. In order to solve the above-mentioned inconvenience, the present inventor has devised and established a method for forming a linear cam groove. As a result, the rotary cam type press device of the present invention has been realized. In the rotary cam type press device of the present invention, a polygonal cam groove is formed so that a plurality of rotary cams can be continuously mounted on one common cam base. According to this, since a plurality of rotary cams are arranged on a common cam base, stable machining can be performed, and even if a force is applied during machining, the work does not have a seam or a step.

It is preferable that the common cam base of the rotary cam type press device of the present invention is provided with a punch corresponding to each partial groove and covering the upper part of each rotary cam. The work can be supported more stably.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. (Mode 1) A plurality of rotary cams are mounted in a single curved cam groove formed in a common cam base such that the machined surfaces are continuous with each other.

A first embodiment embodying the present invention will be described with reference to FIGS. FIG. 1 is a vertical cross-sectional view of the rotary cam type press device of this embodiment at the bottom dead center of the press.
FIG. 4 is a side view and a plan view of a work receiving portion of the rotary cam type press device, FIG. 3 is a plan view of a cam base of the rotary cam type press device, and FIG. 4 is a cam groove of the rotary cam type press device. It is the figure which modeled the cutting method. It should be noted that the rotary cam press device of this embodiment has two
It is a press device that performs a series of near-end bending work on the end portion of a work that is bent at a location.

The structure of the processing portion of the rotary cam type press device of this embodiment will be described. The rotary cam type press device of the present embodiment is provided with three rotary cams (described in detail later). The structure and operation of each mechanism including these three rotary cams are the same. FIG. 1 is a view in which a rotary cam type press device is longitudinally cut along a plane perpendicular to the axis of one rotary cam. The rotary cam type press device 10 shown in FIG. 1 includes a lower mold 12, and a cam base 14 is fixed to the lower mold 12. The cam base 14 is formed with a cam groove 14a having an arc surface, and the rotary cam 1 is formed in the cam groove 14a.
6 is attached to be freely rotatable. A punch 18 is fixed to an upper portion of the cam base 14 in a state of being projected on the rotary cam 16, and the punch 18 supports the work w on its upper surface. The rotary cam 16 is formed with an end surface 16b for supporting the upper surface of the punch 18 and the lower surface of the work w, and a processing surface 16a having a predetermined shape is formed at a predetermined angle with the end surface 16b. A slide plate 22 for guiding the machining cam 20 having the machining blade 20a to the rotary cam 16 side is attached to a surface of the rotary cam 16 which faces the end surface 16b. The slide plate 22 also functions as a stopper for the clockwise rotation of the rotary cam 16 in the figure. The rotary cam 16 is rotated clockwise in the figure by a cylinder (not shown), and when the slide plate 22 makes surface contact with the upper surface of the cam base 14, the end surface 16b of the rotary cam 16 and the upper surface of the punch 18 are continuous.

The processing cam 20 is slidably held by the upper die holder 24. The upper mold holder 24 has a pad 26
Is also held so that it can be moved up and down, and is lowered together with the upper die holder 24 to position the workpiece w together with the punch 18. Further, as the upper die holder 24 and the pad 26 descend, the machining cam 20 also descends so that the lower surface of the machining cam 20 comes into surface contact with the slide plate 22. The processing cam 20 is guided by the slide plate 22, and the processing blade 20a contacts the processing surface 16b of the rotary cam 16 via the work w.

The operation of the rotary cam type press device 10 will be described. First, the work w is placed on the upper surface of the punch 18. The upper die holder 24 starts to descend, and the rotary cam 16 starts to rotate clockwise in the figure by a cylinder (not shown). When the lower surface of the slide plate 22 attached to the rotary cam 16 comes into surface contact with the upper surface of the cam base 14, the rotation of the rotary cam 16 is stopped. Along with this, the upper surface of the punch 18 and the end surface 16b of the rotary cam 16 form a continuous surface, and the work w is formed by this continuous surface.
Support from below. The pad 26 descends together with the descending upper die holder 24, and the lower surface of the pad 26 eventually comes into surface contact with the upper surface of the work w. As a result, the work w is sandwiched and positioned in the vertical direction. In addition, the upper die holder 24
At the same time, the processing cam 20 also descends, and eventually the lower surface of the processing cam 20 comes into surface contact with the upper surface of the slide plate 22. When the upper die holder 24 is further lowered, the processing cam 20 moves to the slide plate 2
Guided by 2, it slides to the rotary cam side (left direction in the figure), and the machining blade 20a contacts the machining surface 16a of the rotary cam 16 via the workpiece w. Still upper mold holder 2
4 moves down, the processing blade 20a moves the workpiece w onto the processing surface 16
It is pressed against a and bent to a predetermined shape.

The structure of the work receiving portion of the rotary cam type press device having such a processing mechanism, that is, the portion on the side supporting the work from below will be described. Figure 2 (a)
[Fig. 2] is a side view of a work receiving portion of the rotary cam type press device 10 of the present embodiment, and Fig. 2 (b) is a plan view of the same. As shown in FIG. 2, the rotary cam type press device 10 has three
3 rotary cams 16 and corresponding 3
It has two punches 18. These are arranged on a common cam base 14. As shown in FIG. 3, the cam base 14 has two cam grooves 14 that are bent at two points on the way.
a is formed. The cam grooves 14a are formed so that the three rotary cams 16 can be mounted at an angle along the shape of the end of the work (not shown). The processing mechanisms of the three rotary cams 16 are adjusted so as not to interfere with each other.

By the way, according to the conventional method for forming a cam groove shown in FIG. 8, only a linear cam groove can be formed, and as described above, a polygonal cam groove cannot be formed. The present inventor has developed a cutting method capable of forming a linear cam groove like the rotary cam type press device of the present embodiment without the above restriction. This cutting method is shown in FIG. FIG. 4 is a schematic view of the method for cutting the cam groove of this embodiment. As shown in FIG. 4, a ball cutter 30 is used as the processing blade. Unlike the conventional cutting method shown in FIG. 8, the cam base 14 and the punch (see FIG. 1, etc.) are cut separately. While the blade portion 30a of the spherical portion of the ball cutter 30 is applied to the processed surface of the cam base 14 or the punch, while reciprocating along the peripheral surface of the rotary cam (see FIG. 1, etc.) to draw an arc as shown by the arrow in the figure. I will cut. In addition, since the processing surface is a sliding surface with the rotary cam, the blade portion 30 is provided to ensure high processing accuracy.
The shape of a and the feed rate are devised.

The conventional cam groove is formed by assembling a cam base and a punch and cutting them simultaneously. Moreover, since the processing blade can move only in one direction, only a linear cam groove can be formed. could not.
However, according to the cutting method using this ball cutter, the degree of freedom in processing is dramatically improved and it becomes possible to cope with any shape. This makes it possible to form a polygonal cam groove, and it is possible to arrange and install a plurality of rotary cams in a polygonal line shape as in the present embodiment.

As described above, in the rotary cam type press device of the present embodiment, a plurality of rotary cams are mounted in a linear shape on one cam base. Further, each punch corresponding to each rotary cam is also fixed to this one cam base. Since the rotary cams and punches that support the work are arranged on a common cam base, the amount of bending during machining is the same as in the conventional rotary cam type press machine where rotary cams and punches are arranged on separate cam bases. There is no difference in the amount of misalignment and stable processing is possible.

Next, a second embodiment which embodies this embodiment will be described. The rotary cam type press device of this embodiment is similar to the conventional rotary cam type press device in that the cam base, the rotary cam and the punch are unitized. However, in this embodiment, the method of fixing this unit to the lower mold is different. In the conventional rotary cam type press device, this unit is simply arranged and fixed in the lower mold. In the rotary cam type press device of the present embodiment, the unitized cam bases are connected and integrated by a connecting member, and then fixed to the lower mold. That is, each cam base is fixed to the lower mold as one common cam base. According to this, since the cam bases are integrated, the same effect as the first embodiment in which a plurality of cam bases and punches are arranged on the common cam base can be obtained.

When a plurality of sets of rotary cams and punches are arranged in separate cam bases as a unit as in the conventional rotary cam type press device, a difference occurs in the force received at the time of processing for each unit, and the unit The amount of bending and the amount of deviation were different for each. Therefore, the work is likely to be bent or stepped. In the rotary cam type press device of the present invention, since a plurality of sets of rotary cams and punches are arranged on one common cam base, the bending or step of the work due to the difference in the bending amount or the deviation amount of the cam bases is not generated. It can be eliminated and the quality of the product can be improved. Further, the rigidity of the device is improved by integrating the cam base. Further, by integrating the cam base, work efficiency such as assembling is also improved.

Specific examples of the present invention have been described above in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. Further, the technical elements described in the present specification or the drawings are
The technical usefulness is exhibited alone or in various combinations, and is not limited to the combinations described in the claims at the time of filing. In addition, the technique illustrated in the present specification or the drawings achieves a plurality of purposes at the same time, and achieving the one purpose among them has technical utility.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rotary cam type press device of the present embodiment at a press bottom dead center.

FIG. 2 is a plan view and a side view of a work receiving portion of the rotary cam type press device.

FIG. 3 is a plan view of a cam base of the rotary cam type press device.

FIG. 4 is a schematic diagram of a method for cutting a cam groove of the rotary cam type press device.

FIG. 5 is a longitudinal sectional view of an essential part of a rotary cam type press device at a bottom dead center of a press.

FIG. 6 is a side view and a plan view of a work receiving portion of a conventional rotary cam type press device.

FIG. 7 is a plan view of a cam base of the rotary cam type press device.

FIG. 8 is a diagram schematically showing a method of cutting a cam groove of a conventional rotary cam type press device.

[Explanation of symbols]

10: Rotary cam type press device 12: Lower mold 14: Cam base 14a: cam groove 16: Rotary cam 16a: Processing surface 16b: end face 18: Punch 20: Processing cam 20a: Processing blade 22: Slide plate 24: Upper mold holder 26: Pad 30: Ball cutter 30a: blade

Claims (2)

[Claims] 1. A common cam base, a work receiving portion having a plurality of rotary cams, and a working cam for pressing a work between the work receiving portion by approaching the work receiving portion. A rotary cam groove is formed in which the partial groove that has a partially arcuate cross section and extends linearly is continuous in a polygonal line shape.Each partial groove is equipped with a rotary cam that rotates on a common cam base by the peripheral surface. , Each rotary cam is formed with a machining surface extending inward in the radial direction from the peripheral surface, and when each rotary cam rotates at the machining angle, the machining surfaces of the rotary cams continuous in the longitudinal direction are continuously formed. A rotary cam type press device characterized by 2. The rotary cam type press device according to claim 1, wherein the common cam base is provided with a punch that covers the upper part of each rotary cam corresponding to each partial groove.