JPS59199140A - Method and die for upsetting - Google Patents

Abstract

PURPOSE:To perform satisfactory upsetting by restraining both ends of a blank material by the central punch of upper and lower dies having a specific gap length, extruding successively the blank material by the knock-out resulting from descending of the dies and forming the material into a prescribed shape by the final descending of a press. CONSTITUTION:A blank material 1 is inserted into the central hole of a lower die 16 lifted by a cushion pin 18 and an upper die 5 is moved downward. Both ends of the blank material are held by means of an upper punch 7 and a lower punch 21, and a specific gap (l) is maintained by the contact between a holder 6 and a guide 15 as well as a pin 11. The dies 5, 16 are moved downward according to descending of a slide 3, and the blank material 1 is extruded successively into the gap (l) to have a satisfactory shape by the lifting of the punch 21. The die 16 contacts with an anvil 20 but the die 5 descends further until the gap (l) attains a prescribed width, when the pressing is completed. The product having the satisfactory size and shape without having shear droop is obtd. by the satisfactory intermediate bulging.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an upsetting method and mold for accurately forming a flat product with short shafts on both sides by one upsetting from a round bar material.

Conventionally, when manufacturing a flat product with short axes on both sides by upsetting a round bar material whose length is about four times the diameter d, multiple molds were used and several steps were required. . That is, the material (1) shown in FIG. 1 (2) is 0〕), (C),
The product (2) shown in (e) was formed through the intermediate steps shown in (d). As shown in Fig. 3, it was possible to upset the product in one step using a mold with part A of the same shape as the product in the closed chamber with the upper and lower molds in contact with each other, but as shown in Fig. 2 ( a)
Material (1) shown in 0)) is a product (25
There was a drawback that a perfect shape could not be obtained.

An object of the present invention is to eliminate these drawbacks and provide an upsetting method and a mold for the same, which can form a product having a perfect shape of a flat part through one-step upsetting.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 4, the upsetting method according to the present invention will be explained. (The outer peripheral part of the material (] shown in figure a1) is constrained over the required length near both ends, and pressure is applied in the axial direction of the material (1) to upset it, and the unconstrained middle part is perpendicular to the axis. After expanding the area of the middle part and forming it into the intermediate shape shown in the figure, the thickness of the middle part expanded by further applying pressure in the axial direction is t.
is crushed with one trench of the required thickness, and the extruded meat is made to protrude in the direction perpendicular to the axis and is formed into the product (2) shown in Figure (C). By forming an intermediate portion with an enlarged thickness L as an intermediate shape, the thickness t of the flat portion of the Toyoshi product 12) can be formed to be constant up to the outer periphery.

FIG. 5 shows a first embodiment of a mold for realizing the upsetting method according to the present invention. An upper die center (4) is fixed to the slide (3) of the press. An upper die (5) is fixed to the upper die set (4) by a holder (6). A hole is made in the center of the upper die (5) into which the material (raw material) fits, and the upper punch (7) fits therein so that it can move up and down with its upper and lower limits regulated. The knockout rod (9) is forced downward through the knockout pin (8) of the upper punch (7) and protrudes after molding the product (2). Holder (6
) protrudes a required length from the lower surface of the upper die (5). A pin (11) which is biased downwardly by a spring (10) and is movable up and down protrudes from the outer periphery of the upper die (5) and serves to suppress the play of the lower die (1G).

Press bolster (12 has upper diameter) (4) K
The lower die set (+31 is fixed to the lower die set 7) L-(131 is fixed to the guide 0 (A), and the guide (15) is freely raised and lowered, and the upper limit is regulated, and the guide (15) is adapted to the upper die set. The lower die (1G) is compatible with (I5) by restricting its upper limit so that it can move up and down.

A closed chamber for molding the product (2) is provided on the upper surface of the lower die αG). The lower die (16) is urged upward by a cushion rod 09) via a cushion ring a7+ and a cushion pin. The urging force of the cushion rod 09) generates a closing force when the upper die (5) descends and the material (1) is upset between it and the lower die (16). An anvil (2o) regulating the lower limit of the lower die (IG) is fixed to the lower die center (13) in the center of the cushion ring 07).

A lower punch (21) is fitted to the anvil (20) so as to be able to move up and down with upper and lower limits being regulated. Lower punch (21)
The upper part is the material (1) made in the center of the lower die 06).
) fits into the hole. The lower punch (211) is provided below and is pushed up by a knockout pin (c) via a knockout bin (22) to eject the molded product (2).

Next, the function of the mold of the first embodiment will be described. In Fig. 5, when the guide 15) is biased by the cushion pin 08) and is at the upper limit as shown in the left figure, the material (1) is inserted into the hole of the lower die 06), and the upper die (5) is lowered. Then, the upper die set t4) and (13) are closed.

The material (1) is sandwiched between the upper punch (7) and the lower punch (21), and both ends are separated by the upper die (5) and the lower die σ6).
The required length is inserted into the hole. The lower die (06) is biased by the pin (11) of the upper die (5) to suppress play, and the distance t between the closed chamber and the soil die (5) is equal to the thickness t of the intermediate portion shown in Fig. 4. are being equalized. Next, when the upper die set (1) is pushed down, the holder (6) pushes down the guide (15) and cushion ring 07), and the material (1) is thickened while the closing force of the cushion pin 08) remains in effect. The middle part of t is extruded in the radial direction, and after the lower die (1G) comes into contact with the anvil (20), the middle part is crushed by the upper and lower dies +51 (1, 61) and becomes a product (as shown in the figure on the right). 2).

FIG. 6 shows a mold of the second embodiment. °
A 2-type dicer l-(4) is fixed to the slide (3) of the base.The upper die set (4) has an upper die (5) that has a hole in the center that fits the material (1). is fixed, and the upper punch (7) fits into the hole so that it can move up and down with the upper and lower limits regulated.The upper punch (7) is pushed downward by the knockout rod (9) via the knockout pin (8). It is energized so that the molded product (2) is projected.A lower die set (4) is fixed to the bolster (12) of the press so as to face the upper die set (4). Lower Daicera l-(Guide fixed to 131)
14) is compatible with the lower die (1G) being able to move up and down with a restricted upper limit. The lower die (1G) has an insert (
24) is adapted to be freely raised and lowered, and the insert (24) is biased downward from the lower die (1G) through a spring (2ω).The lower die (1G) and the insert (24) are connected by a cushion ring force, It is biased in the -1=direction by the cushion rod 0 mark via the cushion pin 08). As shown on the left side of the figure, the height difference t between the lower die (16), which is biased upward, and the insert (2, v) is equal to the thickness L of the middle part shown in Figure 4 (1). is,
It forms a closed chamber. Lower die set (+
31 has an anvil (
20) is fixed, and the lower limit of the inserter 1 (2a) is regulated.The lower punch (2I) can be freely raised and lowered into the hole of the anvil 2 (11), and the upper and lower limits are regulated and fit. , its upper part fits into the hole into which the central material (1) of the insert (2(a)) fits.

The lower die (16) and the insert e (a) constitute a double-layered die. The lower punch (21) is pushed up by a knock-out rod (23) via a knock-out pin (22) provided below to push out the molded product (2).

Next, the function of the mold of the second embodiment will be described. In Fig. 6, when the lower die (16) and the inserter (24+) are biased by the cushion bin 08 and are at the upper limit, the material (1) is inserted into the hole of the insert (211), and the upper The die (5) descends and the upper and lower die 7.
Throat (4) Q31 is occluded. At this time, the upper die (5
), the upper punch (A), the lower die αG), the insert (2 (B), and the lower punch (2I)) form a closed chamber with a thickness of t in the middle part, and both ends of the material (1) are The length of the insert (2) is restrained at the outer circumference.The insert (2) is in contact with the cushion ring force without any play due to the spring (25).Subsequently, when the upper die set (4) is pushed down, the lower die tm and The insert (2) descends along the guide a (a) while receiving the closing force due to the upward biasing force of the cushion pin (181), and the material (], ) is formed by extruding the middle part of the thickness L in the radial direction. is,
After the bottom surface of the insert (2 (A) contacts the anvil 00), the middle part of the thickness t is connected to the upper die (5) and the insert (
The product is crushed into a product (2+) as shown in the figure on the right.

In the molds of the first and second embodiments, the lower die set (4) may have the same configuration as the lower die set (131).

As is clear from the above description, according to the present invention, the process of enlarging the intermediate part and the process of molding it into a product can be performed together by one upsetting process, and the flat intermediate part can be It has extremely practical effects and advantages, such as being able to mold parts into perfect shapes, and the mold being suitable for automation for efficient mass production.

[Brief explanation of the drawing]

Fig. 1 shows a conventional molded product using multiple steps. Fig. 2 shows a conventional molded product using one step. Figure 3 is a vertical sectional view showing a conventional mold using one step. FIG. 4 is a diagram showing the molded product of the example, and FIGS. 5 and 6 are longitudinal sectional views of the mold of the example. 1 is the material, 2 is the product, 3 is the slide, 4 is the upper guide set, 5 is the upper die, 6 is the holder, 7 is the upper punch, 8 is the knockout bin, 9 is the knockout bin, 10 is the snow ring, 11 is the bin , 12 is a bolster, 13 is a lower die set, 14 digits guide, 15 is a guide, 16 digits lower die, 1
7 is cushion ring, work 8/'i cushion bottle, 1
9 is a cushion rod, 2o is an anvil, 21 is a lower punch, 22 is a knockout bottle, 23 is a knockout rond, 24 is an insert, and 25 is a spring. Patent Applicant AIDA Engineering Co., Ltd. Representative Meeting 1) Keinosuke

Claims (1)

[Scope of Claims] In the 1-step upsetting process, a step of expanding the intermediate portion in a direction perpendicular to the axis by applying pressure in the axial direction while restraining the outer peripheral portion near both ends of the material, An upsetting method comprising the step of forming the enlarged intermediate portion into a desired external shape and thickness by further applying pressure in the axial direction while restraining the outer circumferential portion near both ends. 2. In a die for upsetting a press, at least one of the upper and lower die centers is provided with a device that generates an axial biasing force, and the die center having the device is provided with a punch that receives the end face of the material, and a punch that receives the end face of the material, and a punch that receives the end face of the material, and A die that has a matching hole, is biased by the device, is slidably guided in the axial direction by a double structure guide, and has a retraction limit regulated at a fixed position, and the other die set A mold for upsetting processing characterized by being equipped with a punch and a die corresponding to the above. 3. Claim 2, wherein the die urged by the device has a double structure, the outer periphery of which is slidably guided in the axial direction by a guide, and the retraction limit of the inner die is regulated to a fixed position. The described upsetting mold.