JPS61129247A - Plastic work method - Google Patents

Abstract

PURPOSE:To work a medium necking component without shaving cutting allowance with less die wear in less man/hour by transferring a regular sized blank to the interstage cavity in order at the upper and lower dies releasing time and by inserting a punch from both side parts of the cavity at the upper and lower dies joining time with a squeezing. CONSTITUTION:The first cam peak is formed inside cavities 11, 21 by inserting and squeezing both sides punches 6, 6' at the upper and lower dies 1', 2' joining time and by putting a regular sized blank 3' into the cavity 21 at the upper and lower dies 1', 2' releasing time in the die forging of the medium nacking component of a cam shaft, etc. The second cam peak is then formed with transferring to the cavity 22 at the upper and lower dies 1', 2' releasing time and with the squeezing of both sides punches 7, 7' at the upper and lower dies 1', 2' descending time. A stepped shaft and flange part are formed by the final cavities 13, 23 similarly. The component without burr is forged and formed quickly in less man/hour with less temp. decline, the product of high accuracy is made with good yield and small pressing force and the wear of dies is reduced.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a plastic working method.

(Prior art) When forming a part with a constriction in the middle, such as a camshaft, by die forging, it is not possible to extract the product in the axial direction, so conventionally, as shown in Fig. 7, an upper die (1), Prepare the lower mold (2) and place about 1.200 t on top of the lower mold (2) as shown in Figure 8.
: Place the heated material (3) on top, lower the upper mold (1) and stack it on the lower mold (2) as shown in Figure 9.
A forming load is applied to the upper surface of the material (3) to deform it into the cavity formed by the upper mold (1) and the lower mold (2). The part of the material (3) that exceeds the internal volume of the cavity protrudes onto the mating surface of the upper mold (1) and lower mold (2), and as shown in Figure 10, the protruding part forms a beam (5) with the camshaft (4). A finished product is completed.

(Problems to be Solved by the Invention) In the processing method shown in FIGS. 7 to 10, ■Material (
3) In order to make it easier to deform, it is necessary to heat it to about 1200C, which causes oxidation and decarburization on the material surface, and it is necessary to allow for a cutting allowance of about 1 dragon, which reduces the retention of the material. , a large amount of heating energy is required. (2) Since burrs (5) are generated on the mating surfaces of the upper die (1) and the lower die (2), an excessive molding load is required, resulting in severe wear of the mating surfaces of the dies. ■In order to make a finished product, 9 operations of removing the blade (5) and a machining process to remove the excess material are required, which increases the processing cost.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has been proposed in order to solve the above-mentioned problems. When the upper and lower molds are joined together, a plurality of punches are inserted from both sides into the cavities of the upper and lower molds to squeeze and press the material in each cavity from both sides. The purpose of the plastic working method is to provide a plastic working method that does not require cutting allowance, causes less wear and tear on the mold, and reduces the number of processing steps.

(Example) The plastic working method of the present invention will be explained below with reference to an example shown in FIGS. 1 to 6. As shown in FIG. A punch (6) that presses the lower mold Uυ (21) and the upper and lower molds (11) (21) from both left and right sides.
) (The first plastic forming tool has six pieces, and the upper and lower molds have stepped details, a second cam part, and large and small diameter parts shown in Fig. 5.
12) Same as (22), a punch (a second plastic forming tool with a force (7) for pressing the upper and lower molds (12) and (22) from both left and right sides, and an additional step in addition to the upper and lower molds (12) and (22). A sixth having a left side extrusion part, a right side 7 lange part and a right side extrusion part of the attached shaft.
The upper and lower molds (13) (23) shown in the figure and the same upper and lower molds (13)
) (23) from both left and right sides (8) (8'
) as shown in FIG. Type (
21) (22X23) is integrated into a lower mold (2'),
The left punch (6) (force (8) is integrated into the left punch (9), and the right punch (6s (7') (&')
As shown in Figure 1, the upper and lower plates (1) and the upper and lower plates (1) (10) are integrated into the right punch (10), and the upper mold (1) is attached to the upper ram (14). ),
Attach the lower die (2') to the lower ram (15), attach the left punch (9) to the side ram (16), and attach the right punch (
10) to the side rams (17), and each ram (14)
(15), (16), and (17) are connected to a hydraulic power source via separate control valves (not shown).

(Operation) Next, the operation of the plastic working method will be explained. As shown in Figure 3, the material heated to 200 CK (ω) is placed in the upper mold (11).
and the lower mold (21) are placed on the large diameter part, and the upper W (
11) and lower fJ-(21). Next, as shown in Figure 4, when punches (6) are pushed into the left and right holes, the material (target) is compressed by the punches (6) and its outer diameter is narrowed and moves to the right. (The first cam ridge is upset-formed by pressing 6 times.Next, release the left and right punches (6), the upper die (11), and the lower die (21), and take out the workpiece.
Fifth: Set it in the second lower mold (22) shown in the figure, tighten the second upper mold (12) to the second lower mold (22), and press it with a punch (force (7) from the left and right sides. , and press to upset and form the stepped shaft portion and the second cam ridge.Next, the workpiece is taken out from the second upper and lower molds (12) and (22) and transferred to the third lower mold ( 23), tighten the third upper fil (13) to the lower mold (23), push in the punch (8) (8') from the left and right sides, and press it to extrude the stepped shaft side to the left. Perform finishing upsetting, extruding the flange part to the right, and finishing upsetting.
When the lower molds (13) and (23) are opened and the workpiece is taken out,
All processing is completed.

In the plastic working method of the present invention shown in FIGS. 1 and 2, the second
The material (3') is set in the lower die (21) of the lower die (2') shown in the figure, and the upper ram (14) is lowered to bring the upper die (1) into contact with the lower die (2'). The upper and lower molds (1
(-s) Lower near to apply counter pressure so as not to move away.
A (15) Apply K oil pressure, sidera! (16) (1
7) completes the specified movement, Cy V5 (16) (17
) Move Ic in the opposite direction, loosen the hydraulic pressure of the lower ram (15), and when the punches (9) and (10) return to their original positions, the upper ram (1
4), raise the mold (1), transfer the workpiece in the lower mold (21) of the lower mold (2') to the lower mold (22) K, and
21) Set the material (3') on the tray.

Every time each of the rams (14) to (17) completes one cycle, the workpieces in each mold of the lower mold (2'') are sequentially transferred to the front side, and the material (3 pieces) is set in the lower mold (21). By repeating this, one finished product is produced every time the rams (14) to (17) operate one cycle after the fourth cycle.

Alternatively, the lower ram (15) may be omitted and the lower mold (2') may be fixed so that the upper ram (14) exerts a strong pressing force when descending.

(Effects of the Invention) As described above, in the plastic working method of the present invention, when the upper and lower molds are released, the material is sequentially moved from the cavity where the material is molded in the intermediate stage to the cavity where it is molded in the final stage. When transferring and joining the same above and lower molds, multiple punches are inserted from both sides into the cavities of the same above and lower molds to squeeze and press the material in each cavity from both sides. The forging process is extremely shortened because only one finished product is produced in each cycle. ■Since the upper and lower molds are built into subdivided molds according to the process, the heating temperature of the material can be lowered, and precise plastic forming can be performed with a small pressing force, improving the yield of the material. Less wear and tear on the mold. ■The finished product can be turned into a finished product by applying a grinder process, which has the effect of shortening the entire process.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to these embodiments, and can be modified in various ways without departing from the spirit of the present invention. I'll go.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of an apparatus embodying the plastic working method of the present invention, FIG. 2 is a perspective view showing the mold and punch of FIG. 1, and FIGS. 3 to 6 are Process analysis diagrams of one embodiment, FIGS. 7 to 10 are process analysis diagrams of a conventional processing method. (1st...shelf, (2')...lower mold, (3...
Material, (9) (10)...Punch, (14)...
Upper ram, (15)...Lower ram, (16) (17)...
・Side rum. Sub-Agents - 3 Patent Attorneys (Patent Attorneys) Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] When the upper and lower molds are released, the material is transferred one after another from the intermediate stage molding cavity to the final stage molding cavity. A plastic working method characterized by inserting a plurality of punches into each of the cavities from both sides to squeeze and press the material in each cavity from both sides.