JPS59197336A - Forming method of link - Google Patents

Abstract

PURPOSE:To form a link without burring by bending a plate-shaped blank material, disposing the material in closed dies having a space conforming to the shape of the link, and punching the material with plural punches to fill the blank matrial into the dies. CONSTITUTION:A preform material 5 formed by bending a plate-shaped blank material to a prescribed shape is set in closed forging dies 20, 21 formed with the space conforming to the shape of a link which is a final product. The blank material is punched with holes by using plural punches 14, 15, 16, 17. The excess metal in the holes escapes to the outside circumference and the escaping material fills the gap between the preform 5 and the dies 20, 21, thereby filling finally the dies. Cross holes are then opened in the same dies 20, 21. The volume of the blank material is so unified that the volume of the preform 5 and the link is made roughly constant. The link constituting the track of a bulldozer, etc. is formed with a good yield by the abovementioned method.

Description

[Detailed description of the invention] The present invention relates to a method of forming and processing inks.

Link A is shown in FIG. Conventionally, such links have been formed through the steps shown in FIG. 2. To explain such a conventional forming process, first, (a) is a material, which is a large steel ingot (block).

This raw material block is repeatedly subjected to free forging (crushing) until it becomes a predetermined plate as shown in (b). After this (0
Die forging (rough punching) is performed to obtain the approximate shape as shown in (d), followed by finishing die forging as shown in (d), and then the protruding burr 1 is removed. After these steps are completed, machining of predetermined parts is performed to produce the product.

This conventional method requires a large number of man-hours and wastes a lot of paulownia wood during forging and machining, resulting in a material yield of less than 50%.
There is a large material loss.

In view of the problems with the conventional methods, the present invention aims to enable molding without waste in terms of man-hours, labor, and materials, and to reduce costs.

Examples according to the present invention will be described below. FIG. 3 shows a conceptual diagram of the molding method. Figure 3(a) shows material 2. This material 2 is a flat plate material. This material 2 is rolled to a predetermined thickness in the step (b), and the internal structure and plate thickness are made uniform to obtain the material 4 shown in (0). 3 is a rolling roll. Next (d)
In the process.

A preform 5 is made by bending the rolled roll 4 into a predetermined shape using a bending press. However, the rolling step I)) may not be performed depending on the specifications of the product.

For this bending method, a simple bending press as shown in FIG. 4 is sufficient. 6, 7.8 are gougs for bending presses.

The preform material 5 thus formed is set in a closed forging die. In this closed mold, holes are punched at predetermined positions and a bulging process is performed to form the shape shown in FIG. 3(e).

Next, the final step (e) will be explained in detail. Figure 5 shows the outline. Here, in the diagram shown in FIG. 3(e), 1
0.11.13 shows the processing state of holes in the thickness direction. The preform 5 is placed into a closed forging die 20,2]. The space formed by this mold 20, 21 is the same as the shape of the link that is the final product. This type 20.2
The preform 5 in 1 does not fill the mold before processing. However, punch 14, 15. ] By drilling at 6°17, the excess material in the hole escapes to the outer periphery. This escaped material fills the gap between the preform 5 and the mold 20.2, and finally fills the mold. (B
>130) L > L.

Therefore, it is a prerequisite that the volumes of the materials are made equal in advance so that the volumes (weights) of the preform 5 and the links are approximately constant.

Thereafter, as shown in FIG. 6, in the same mold 20° 21, a horizontal hole 12 as shown in FIG. 3(e) is made. At this time, the material in the mold fills the dowel molds 20 and 21. Of course, the vertical holes 10, 11, 13 are machined.

The horizontal hole 12 is formed using a punch shown at 22.23 in FIG. At this time, the vertical hole punches 14, 15 and 16, 17 are retracted into the mold so that they do not interfere with the machining of the punches 22, 23.

In this way, the target link is processed. According to this method, molds 20 and 21 are hermetically sealed, so that no flashing occurs. Therefore, the material yield is almost 100%.

In addition, the number of processes is small, which greatly contributes to cost reduction.

Next, the above-mentioned drilling procedure will be explained in detail.

Figure 7 shows the machining process for hole 10.13.
(a) in the figure is the state before drilling 1 (I)) in the figure is the state before drilling,
Currently being processed. Here, the punches 14 act simultaneously from above and below. In other words, the punch 14 is pushed into the material, and paulownia wood corresponding to the volume of the punch 14 pushed into the material is pushed to other parts. This increases the length of the material. , , are after processing. Since D>Do, the height increases by the volume of the hole. Note that if the punch is pushed in from both the top and bottom, a portion of the material that cannot be removed will be created in the middle of the material, only the portion that is sandwiched by the punch, and therefore the hole will not be penetrated. (0) in the figure shows this hole penetration method. In other words, processing is performed using only one punch, and this one punch pushes out the excess material 25 remaining in the middle of the material. This allows the holes to pass through and the preform 5 to fill the mold.

Next, FIG. 8 shows the method of machining hole 1 in the two-stepped part. In the figure, (a) is before processing, and (1) in the figure is during processing. In this case, the punch 15 does not have one end, and the diameter d2 of the punch 15 is the same as the diameter of the through hole, but the upper die 20 does not have a punch, and the diameter of the hole, d2, is the same as the outer diameter of the stepped part. Yes, d
2) D.

With this structure, when the punch 15 is pushed into the old material 5, the hole (Dl) of the die 2o and the outer periphery of the punch 15 (d2
) the material flows between them. Moreover, the diameter d is equivalent to 15 punches.
2 holes are penetrated.

As a result, the molded shape shown in (0) in the figure is obtained.0 The links are molded in the same mold by the above method. If it is acceptable for the two dimensions of the product to have some variation, Tonoma 1 may be used. In addition, if the two dimensions of the product shape are to be exact, finishing pressing may be performed as part of the sizing process to improve accuracy.

- As mentioned above, according to the present invention, a conventional block-shaped material is forged several times into a flat plate, and then.

After forging several times using die forging, the link was finally machined and finished using a thin plate material, which was bent and then drilled using a double-acting press and a closed die.
By performing the tentering process within the same mold, the material yield is good and the number of man-hours can be significantly reduced.

[Brief explanation of drawings]

Figure 1 shows the link, Figure (a) is a plan view, Figure (I
)) is a front view. FIG. 2 is a process diagram showing a conventional method. FIG. 3 is a process diagram of an embodiment according to the present invention. FIGS. 4 to 8 are schematic explanatory diagrams showing details of individual steps. 20.21・Type, 14,15,16.17・To Punch SC! , , / Shi[ -214- (＼ cIVJ 1st page continuation 0 Inventor Minoru Morita 1106-4 Shimizu, Uozumi-cho, Akashi City Mitsubishi Heavy Industries, Ltd. Akashi Works 0 Author Hanada Mankutsu Uozumi-cho, Akashi City 1160-4 Shimizu Mitsubishi Heavy Industries, Ltd. Akashi Works 216-

Claims (1)

[Claims] After bending a plate-like material into a predetermined shape, it is placed in a closed carving die in the shape of a link, and a hole is punched into the material with a punch of a predetermined diameter. A method for molding a link, characterized by filling the mold.