JPH04200934A - Cupping die - Google Patents

Abstract

PURPOSE:To accurately work a bottom surface and product chamfering part by mounting a shoulder part to work a product chamfering part on a forming punch to work a plate material into the shape of a bottomed cylinder and providing a chamfering part and a clearance part on a forming die. CONSTITUTION:A plate material 2 is held between a stopper 5 and a forming die 3 and the forming punch 1 is lowered and the material 2 is worked into a bottomed cylinder. Then, an ejector 4 is elevated to eject the obtained product from the forming die 3 and to recover it. In this cupping die, a shoulder part 1a working the product chamfering part 6 on the boundary between the bottom surface and the outer peripheral part of the product is provided on this forming punch 1. On one hand, a chamfering part forming the product chamfering part 6 between the forming die 3 and the shoulder part 1a of this forming punch 1 and a clearance part 7 carrying out no chamfering are provided partially on the forming die 3 to form a clearance A communicating with a degreasing hole 8. Consequently, grease and air are prevented from remaining between the material 2 and the forming punch 1 and the bottom surface of the product and the product chamfering part 6 are improved in accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a relief shape for a cupping mold.

Conventional technology In recent years, drawn products are not only used as covers and containers, but also as assembly components, and high precision is required to simplify assembly 2 and reduce the number of parts. It has been done.

An example of a conventional cupping mold will be described below with reference to the drawings.

In FIG. 3, 11 is a forming punch, 12 is a material, and 13 is a forming punch.
14 is a molding die, 14 is a rainbow vector, ] 5 is a stripper, and 16 is a chamfered portion. The forming punch 11 descends onto the material 12 fixed by the forming die 13 and the stripper 15 to perform forming. When the molding is completed, the molding punch 11
is raised, and then the ejector 14 and stripper 15 are raised to extrude the product from the forming die I3.

FIG. 4 is an external view of a product molded using a conventional mold, in which a chamfered portion 17 is provided on a shoulder portion on the boundary line between the bottom surface 18 and the outer peripheral portion 19.

This product chamfered portion 17 is formed by forming the punch 1 at the chamfered portion 16.
1 and a molding die of 1:3.

Problems to be Solved by the Invention However, with the above configuration, it is not possible to provide air and oil escape holes in the forming punch in molds for products that require high precision on the bottom surface and inside the product chamfer. . Therefore, when the forming punch descends, oil and air trapped inside the bottom surface and the product chamfer remain and are compressed together with the material, so it is important to maintain the accuracy of the bottom surface and the inside of the product chamfer. It had a difficult problem.

Means for Solving the Problems In order to solve the above-mentioned problems, the cupping mold of the present invention includes a forming punch that processes a plate-shaped material into a bottomed cylindrical shape between a forming die, and a mold around the forming punch. A stripper is arranged to sandwich the plate-like material between the molding die and the ejector 7, which discharges the processed bottomed cylindrical product from the molding die. A shoulder portion for forming a product chamfer provided at the boundary of the outer peripheral portion is provided, and the forming die is provided with a chamfer portion for forming the product chamfer between the shoulder portions of the forming punch, and a chamfering process is performed on this chamfer. The present invention is characterized in that a relief portion is partially provided to prevent this from occurring.

Operation The present invention has the above-described configuration, so that necessary parts on the bottom surface and inside the product chamfered part that require precision can be machined with good accuracy without oil or air remaining between the material and the forming punch. Become.

EXAMPLE Hereinafter, a cupping mold according to an example of the present invention will be described with reference to the drawings. In Fig. 1, 1 is a forming punch, 2 is a material, 3 is a forming die, 4 is an ejector,
5 is a stripper, 6 is a chamfering part for chamfering the product, and 7 is a relief part for not chamfering.

The forming punch 1 is machined into a shape necessary for processing the inner shape of the product. The molding die 3 is processed to have the outer shape of the product, and chamfered portions 6 and relief portions 7 are provided alternately at several locations. A clearance A larger than the thickness of the material 2 is provided between the relief part 7 and the shoulder part 1a of the forming punch 1.

In the processing, first, the stripper 5 descends and presses the material 2,
Next, the forming punch] descends and passes the material 2 between it and the forming die 3.
Process. As the forming punch 1 approaches the bottom dead center,
When the forming punch 1 descends, air, oil, etc. trapped between the forming punch 1 and the material 2 are compressed and seek escape. At this time, since the relief part 7 is provided adjacent to the chamfered part 6, the part of the material 2 facing the relief part 7 is not chamfered and protrudes outward, creating a gap between the shoulder part 1a and the material 2. occurs, and air and oil move and accumulate there,
The other chamfered parts can be sufficiently processed by the forming punch. Figure 2 is an external view of the product. 9 is a product chamfer, and 10 is a relief part, ensuring the accuracy of the product chamfer 9.

Also, the relief portion 7 and the forming punch 1 facing the relief portion 7
It is even more effective to provide an oil drain hole 8 in the shoulder portion 1a for draining oil.

Effects of the Invention As described above, the present invention allows machining to be performed without oil or air accumulating in areas where precision is required, compared to conventional products, so chamfers and bottom surfaces that require precision can be machined with high precision as a reference during assembly, and The shape of the forming punch can be any desired shape, so
This also makes surface management easier.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a No. 1 tubing mold according to an embodiment of the present invention, not showing the bottom dead center state of the forming punch, and FIG.
Fig. 3 is a side sectional view showing the bottom dead center state of the forming punch in the conventional cupping die, and Fig. 4 is a perspective view showing the product processed by the cupping die shown in the figure. FIG. 1... Forming punch, 2... Material, 3.
...Molding die, 4...Ejector, 5
... Stripper, 6... Chamfered part,
7... relief part, 9... product chamfer part. Name of agent: Patent attorney Akira Kokaji and two others./
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Claims (1)

[Claims] a forming punch that processes a plate-shaped material into a bottomed cylindrical shape between the forming die and the forming die; a stripper disposed around the forming punch and sandwiching the plate-shaped material between the forming die; an ejector for ejecting a bottomed cylindrical product from the forming die; the forming punch is provided with a shoulder portion for machining a product chamfer provided at the boundary between the bottom surface and the outer circumference of the product; A cupping mold characterized in that a chamfered part for forming a product chamfered part is provided between the molding punch and a shoulder part of a forming punch, and a relief part in which no chamfering is performed is partially provided in this chamfered part.