JPS5834213B2 - Molding equipment for products with upsetting heads - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for molding products having a shaft and an upset head.

Conventionally, when manufacturing a product with a large step between the shaft diameter and the head, the deformation process is shown in Figure 1. (a) From the raw material,
(b) The shaft is molded, and then (C) the head is installed.

In this case, in a press mechanism that has an ejector or die cushion at the bottom of the mold that is linked with the upper mold at the top of the mold, the ejector also stops at the top dead center of the upper mold, and the workpiece has an unstable shape. However, it has the disadvantage that it cannot be maintained vertically until the press starts.

Therefore, a cam or hydraulic device is installed between the upper mold and the ejector interlocking mechanism, and a press is used that allows the ejector to drop slightly at the top dead center of the ram.When the ejector descends into the small hole, the shaft of the workpiece Insert the lower end into the eyelet to hold the workpiece vertically.

However, this method requires a cam and a hydraulic mechanism, making the press machine itself expensive.

In addition, the shaft of the product is sloped or stepped so that the product can be taken out without the ejector reaching the top of the small hole, but in this case, the shape of the product is specified. I don't like it.

Furthermore, there is a method in which the upper die is stopped at top dead center, then lowered a little again, and the product is inserted when the ejector has descended into the small hole, but this method reduces the operating rate of the press operation. There are also disadvantages such as frequent failures of the press machine's clutch brake.

Furthermore, although there are machines that use a partially movable mold to mold the head, the molding of the head is carried out by a suppression mold inserted into the movable mold, so force is only applied to a portion of the head, resulting in a dimensional shape. There is a drawback that it cannot be finished accurately.

The present invention aims to improve these conventional problems, and includes a sliding part having a hole for accommodating the shaft of a tag product inserted into a press mold, and the sliding part is formed by molding. The gist is an apparatus for molding products having an upsetting head, which is characterized by a height that sometimes creates a space for molding a stepped head of the product between its top surface and an upper die. .

To explain the embodiment with reference to the drawings, in Fig. 2, 1
2 is a mold, 2 is a sliding part, and 3 is an ejector, and the sliding part 2 is a mold 1 so as to create a space between the top surface of the sliding part 2 and the upper mold to mold the stepped head of the product. The height is smaller than the height of the inner surface of the mold 1, and it slides up and down inside the mold 1.

A through hole 4 is bored in the center of this sliding portion 2.

6 is the upper mold.

Figure 2 shows a state in which the upper mold 6 is at the top dead center and the ejector 3 that is linked to the ram is pushing up the sliding part 2 to a position where its upper surface is equal to the upper surface of the mold 1. .

When the shaft part of the workpiece 5 is inserted into the through hole 4 of the sliding part 2 in this state and the upper mold 6 is lowered, the workpiece 5 is moved into the sliding part 2.
While being held in place, the workpiece descends inside the mold 1 together with the ejector 3, reaches the bottom dead center, and as shown in FIG. A product A having the shape of a temple chamber is obtained.

Next, as shown in FIG. 4, when the upper mold 6 is raised, the ejector 3 is also raised, pushing up the sliding part 2 and raising it to a position where the product A can be freely taken out.

Since the product A is held by the through hole 4 of the sliding part 2, it will not fall over.

In this way, even with a press in which the ejector and the upper die are linked, when upsetting the head of the workpiece, the workpiece can be inserted and taken out without the need to lower the ejector. Since it can be carried out stably, the one cycle time required for molding can be significantly reduced, and the life of the clutch and brake can also be greatly improved.

Furthermore, there is no need to worry about the product falling over when inserting or removing the processed product, so no fall prevention device is required.

Furthermore, since the stepped head is pressed uniformly over the entire surface, it is possible to mold the size and shape accurately.

[Brief explanation of drawings]

Figures 1a, b, and c are explanatory diagrams showing the molding process of a product with an upsetting head, and Figures 2 to 4 are explanatory diagrams of an embodiment of the device of the present invention. 3 shows the state when the product is at the top dead center, FIG. 3 shows the state when the product is at the bottom dead center, and FIG. 4 shows the state when the product is taken out. 1...Mold, 2...Sliding part, 3...
...Ejector, 4...Through hole, 5...
・Processed product, 6...Upper mold, A...Product.

Claims (1)

[Claims] 1. A sliding part is inserted into the press mold and has a hole for accommodating the shaft part of the product, and the sliding part forms a stepped head of the product between its top surface and the upper die during molding. A device for molding products having an upsetting head, characterized in that the height is such that a space is created for the molding of products.