JPS624353Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a forging press, specifically a forging press suitable for forging a member having flanges on both sides of a small diameter part in the center, such as a rolling wheel used in an undercarriage device of a tracked vehicle. It is related to.

Conventionally, as shown in FIG. 1, this type of forging press has a slide 2 that is movable up and down along a guide 1, and a punching gear 3 on the top of the slide 2.
A cylinder 4 is provided to form a hydraulic chamber 5,
Slide 2 the cylinder chamber 6 that opens into the hydraulic chamber 5.
A punch holder 7 is fitted into the cylinder chamber 6, and a knockout pin 9 is provided in the bed 8.
It is known that the punch holder 10 is provided with a punch holder 10 that can be moved up and down.

When roller B was forged from material A using a double-acting forging press with this structure, the following problem occurred.

That is, as shown in FIG. 1, the slide 2 is provided with an upper die 11, the punch holder 7 is provided with an upper punch 12 passing through the upper die 11, and the bed 8 is provided with an upward recess 13, a downward recess 14, and each recess. A pair of divided lower molds 1 forming holes 15 penetrating the bottom walls of 13 and 14
A lower mold 16 consisting of 6 ₁ , 16 ₂ and a lower mold main body 23
, the punch holder 10 is provided with a lower punch 17,
As shown in Figures 2, 3, 4, 5, and 6, the roller B was processed in sequence.
In the processing process shown in the figure, the upper and lower parts of the meat are distributed (that is, the upper and lower recesses 1 of the divided lower molds 16 ₁ and 16 ₂
3 and the downward recess 14) are not evenly distributed, and as shown in FIG. As shown in Figure 8, the machined roller B has a thick upper flange b' and a thicker lower flange.
b'' was lacking in thickness (Fig. 8 a, b) and could not form the desired shape.

In addition, in the process shown in Fig. 2, the fallen scale falls at the arrow part in Fig. 7, and since it cannot be removed during processing, pockmarks due to the scale (Fig. 8 c) are created on the lower flange b''. It has happened.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to process a member such as a rolling wheel, which has flanges on both sides of the center small diameter portion as a boundary, into a predetermined shape. Our goal is to provide forging presses.

Embodiments of the present invention will be described below with reference to FIG. 9 and subsequent figures. Note that members that are the same as those in the prior art have the same reference numerals.

Each of the lower molds 16 is divided into the lower molds 16 on the bed 8.
Multiple cylinder mechanisms 2 that push up ₁ , 16 ₂
0 and 20 are provided, and the press rod 22 is made to protrude upward from the lower mold body 23 by the piston rods 21 and 21,
As shown in FIG. 9, the divided lower molds 16 ₁ and 16 ₂ are pushed up, and spacers 24 and 24 are inserted between them, respectively. In addition, the divided lower molds 16 ₁ , 16
₂ , the means 25 ₁ and 25 ₂ are also pushed up at the same time.

Then, as shown in FIG. 9, the material A is set, and as shown in FIG. 11, the slide 2 is lowered to perform the first processing. It was only slightly deformed.

This is because the divided lower molds 16 ₁ and 16 ₂ are floating.

Then, as shown in FIG. 12, the slide 2 is raised and the spacer 24 is pulled out and removed using the tension rod 25', and the lower mold body 23 and the divided lower molds 16 ₁ , 16 _{2 are} removed.
The scale is blown away by blowing air between the cylinder mechanism 20, and the piston rod 21 of the cylinder mechanism 20 is lowered to lower the divided lower molds 16 ₁ and 16 ₂ into contact with the lower mold main body 23.

After this, as shown in FIG. 13, the slide 2 is lowered and processed again.

After this, processing is carried out in the same manner as in FIGS. 3 to 6 described above.

The wheels processed in this way have a predetermined shape with uniform distribution of the meat on the upper and lower flange portions, and are free from pockmarks caused by scale.

With the present invention as described above, it is possible to accurately process a member having flanges on both sides of the central small diameter portion into a predetermined shape.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the conventional example, Figs. 2 to 6 are illustrations of machining operations, Fig. 7 is an illustration of defects, Fig. 8 is a front view of the machined wheel, and Fig. 9 is an implementation of the present invention. A sectional view showing an example, FIG. 10 is a sectional view taken along the line X-X, and FIGS. 11 to 13 are explanatory views of processing operations. 2 is a slide, 7 is a punch holder, 8 is a bed, 11 is an upper mold, 12 is an upper punch, 16 is a lower mold,
16 ₁ , 16 ₂ are divided lower molds, 17 is lower punch, 2
0 is the cylinder mechanism, 23 is the lower mold body.

Claims (1)

[Scope of utility model registration request] A punch holder 7 with an upper die 11 and a slide 2 that moves up and down is provided so as to be freely movable up and down, and a lower die 16 consisting of a lower die main body 23 and divided lower die 16 ₁ and 16 ₂ is provided on the bed 8 side. A forging press equipped with a knock-out punch 17 penetrating upward through the center of a die body 23, characterized in that a bed 8 is provided with a plurality of cylinder mechanisms 20 for pushing up divided lower dies 16 ₁ and 16 ₂ . press.