JPS6229139Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a holding structure for a pad biasing coil spring in a press mold.

More specifically, a plate member is placed at one end of a coil spring interposed between a die and a pad of a press mold,
A folded part is formed on the plate member to be inserted between the windings of the coil spring and is coupled to the coil spring, and the plate member is screwed and fixed to either the die or the pad with a bolt member inserted inside the coil spring. This invention relates to a holding structure for a pad biasing coil spring in a press mold, which is designed to simplify the structure and simplify the installation work.

FIG. 5 shows a press mold consisting of a punch, die, and pad used for sheet metal press working. A punch 1 is fixedly installed at the bottom, and a die 2 is installed at the top that moves up and down by a lifting means such as a ram, and the punch 1 and the die 2 perform desired processing such as pressing, cutting, and drilling a sheet metal workpiece W. will be accomplished. A pad 3 connected and supported by the die 2 is provided between the punch 1 and the die 2, and this pad 3 is connected to the sheet metal workpiece W.
During press forming, the workpiece W is held down to restrict its movement so that it can be press formed into a predetermined shape. A coil spring 4 is interposed between the pad 3 and the die 2, and as the die 2 descends, the coil spring 4 is compressed and deformed, urging the pad 3 downward, and the pad 3 moves the workpiece W with an elastic force. Apply pressure.

FIG. 6 shows a conventional structure for holding the coil spring 4. As shown in FIG. A stopper rod 5 with a threaded portion 5a formed at the lower end is inserted into the coil spring 4 interposed between the die 2 and the pad 3, and the stopper rod 5 is attached to the pad 3 by screwing the threaded portion 5a onto the pad 3. Plant and fix. The stopper rod 5 is formed to be approximately the same as the coil spring 4, or slightly longer, and has a flange portion 5b provided at its tip. The stopper rod 5 normally holds the coil spring 4 by abutting the washer 6 placed on the upper surface of the coil spring 4 with the flange portion 5b. When the pad 4 comes to press down the workpiece W as the die 2 descends, the lower surface of the die 2 presses the coil spring 4 via the washer 6, as shown in the figure, and this provides a biasing force for the pad 3. Relatively coil spring 4 due to the reduction deformation of 4
The stopper rod 5 exposed from the die 2 is fitted into the escape hole 2a formed in the die 2, thereby ensuring further downward movement of the die 2 without being hindered by the stopper rod 5.

Considering that the conventional structure with the above configuration requires a large amount of material such as the long stopper rod 5, and that multiple coil spring holding devices are prepared for one press die, This is not necessarily desirable as it requires processing and forming into a predetermined shape, and this assembly and installation work also requires a relatively large amount of effort and time.
There were also problems in terms of workability. In particular, it is necessary to form the escape hole 2a in the die 2, which requires a drilling process for the hole 2a, and the troublesome core alignment between the hole 2a and the coil spring 4, and the hole 2a and the stopper rod 5 before press forming. It is necessary to carry out alignment work, and in combination with the above, the work becomes increasingly complicated, and improvements in this are desired.

The inventors of the present invention have devised the present invention in view of the above-mentioned conventional problems and to effectively solve them.

The object of the present invention is to provide a press mold that includes a punch, a die, and a pad provided between these, and in which the pad is elastically energized by a coil spring interposed between the die and the pad. A plate member is provided, a folded part is formed on the plate member to be inserted between the windings of the coil spring, the coil spring and the plate member are coupled by the folded part, and the plate member is connected to the pad by a bolt member inserted inside the coil spring. To provide a holding structure for a pad biasing coil spring in a press mold which is screwed onto either one of the dies.

Therefore, the purpose of the present invention is to eliminate the need for the conventional relief hole formed in the die, thereby omitting the troublesome and complicated centering work, thereby improving workability, and improving the coil spring. Others are plate members,
It can be constructed from simple parts such as bolt members, making manufacturing and processing easy, and the coil spring can be held simply by inserting the bolt into the plate member and screwing it into either the die or the pad, simplifying the structure. A holding structure for a pad biasing coil spring in a press mold is provided, which simplifies the installation work of the coil spring.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows the state after the coil spring 4 has been installed. The coil spring 4 is interposed between the die 2 and the pad 3, and a plate member 10 made of a sheet metal material is arranged at one end of the coil spring 4 on the pad 3 side. FIG. 2 is a plan view of this plate member 10. The plate member 10, which has a diameter slightly larger than the diameter of the coil spring 4, is integrally formed with a projecting piece 10b. As shown in FIG. 1, the plate member 10 has a U-shaped cross section parallel to the circular main body 10a at an appropriate distance, and the protruding piece 10b is used as the folded part 11. With the plate member 10 laid on the lower surface of the coil spring 4, the folded portion 11 is inserted between the windings 4a and 4b of the coil spring 4, thereby coupling the coil spring 4 and the plate member 10. A through hole 10c is formed in the center of the circular body 10a of the plate member 10, as shown in FIG.
This spring guide bolt 12 is screwed and fixed to the pad 3 by inserting the spring guide bolt 12 into the pad 3 and screwing the threaded portion 12a. In this way, the plate member 10 is pressed by the lower stepped portion 12c of the large diameter portion 12b of the bolt 12 and integrated with the pad 3, and the coil spring 4 held by the folded portion 11 on the plate member 10
The installation is completed.

The spring guide bolt 12 inserted into the coil spring 4 has a function as a guide pin, thereby preventing the coil spring 4 from vibrating. Further, the length of the portion of the spring guide bolt 12 protruding from the pad 3, that is, the large diameter portion 12b, is the length of the coil spring 4.
The length of the coil spring 4, which is shorter than the length of the die 2 and which applies a pressing force to the pad 3 when the die 2 descends, is sufficient to compress and deform.
Even if a pressing force is applied to the top surface of the coil spring 4 by the shortening of the bolt 12, the coil spring 4
to obtain a telescopic stroke.

3 and 4 show another embodiment. In this embodiment as well, the coil spring 4 is held by a plate member 20 and a spring guide bolt 22, but unlike the previous embodiment, the plate member 20 is It was placed on the die 2 side, and a spring guide bolt 22 was screwed and fixed to the die 2. Further, as shown in FIG. 4, the circular body 20a of the plate member 20
Two protruding pieces 20b integrally formed with each other are provided on opposite sides in the circumferential direction, thereby providing two folded portions 21 obtained by bending the protruding pieces 20b. The member that holds the coil spring 4 in this way is the pad 3.
The number of folded parts inserted between the windings of the coil spring 4 is arbitrary, as long as the coil spring 4 can be reliably prevented from falling off.

As is clear from the above explanation, according to the present invention, the coil spring that presses and biases the pad by compressive deformation can be attached with simple parts such as plate members and bolt members, and the structure is simplified. In addition, since it is only necessary to fix the plate member connected to the coil spring at the folded part to either the pad or the die using the bolt member, the installation work is simple and workability is improved. Since it can be shorter than a coil spring, it is advantageous in terms of materials as well as eliminating the need for a washer compared to the conventional method which used a long stopper rod.

In addition, according to the present invention, there is no need to provide a relief hole, which was conventionally required to be formed in the die, which reduces the number of man-hours required for manufacturing, and eliminates the troublesome work that had to be done because of the relief hole. ,
It is possible to omit the complicated alignment work, and in this respect as well, the work can be made easier and the workability improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the state after the coil spring is installed, Fig. 2 is a plan view of the plate member, Figs. 3 and 4 show another embodiment, and Fig. 3 is a view similar to Fig. 1. , FIG. 4 is a view similar to FIG. 2, FIG. 5 is a front view of the press die, and FIG. 6 is a view similar to FIG. 1 showing a conventional structure. In the drawings, 1 is a punch, 2 is a die, 3 is a pad, 4 is a coil spring, 10 and 20 are plate members, 1
1 and 21 are folded parts, and 12 and 22 are spring guide bolts that are bolt members.

Claims (1)

[Scope of utility model registration request] In a press mold consisting of a punch, a die, and a pad provided between these, the pad is elastically biased downward toward the workpiece by a coil spring interposed between the die and the pad, and a through hole is formed in the center. and a folded part formed by folding a narrow protrusion protruding radially outward from the side of the main body at appropriate intervals in the thickness direction of the main body. A plate member is provided, and a bolt member is provided that includes a threaded portion that can be freely inserted into a through hole of the plate member, and a large diameter portion that is formed to a required length with a diameter that is inserted into the inside of the coil spring, and the plate member Die the body of,
The folded part of the plate member is brought into contact with either one of the pads, and the folded part of the plate member is inserted between the windings of the coil spring to connect the plate member and the coil spring. A press mold characterized in that a threaded part is inserted and the plate member is screwed and fixed to either the die or the pad by a bolt member, and vibration in the radial direction of the coil spring is prevented at the large diameter part. A holding structure for a coil spring for pad biasing.