JPS6130252A - Method and device for full enclosed die forging of deformed component - Google Patents

Abstract

PURPOSE:To prevent the generation of a burr and to elevate the yield by forming the shaft with upsetting the other end of a blank material and with binding the york by turning over after forming the york on the end of a blank material at No.1, No.2 upsetting stages. CONSTITUTION:A plane face 4 is formed by installing a blank material 3 to an inner die 7 and by advancing a forming punch 9 into the inner die 7 at No.1 stage. A york 5 is formed then at No.2 stage by transferring the formed article 10 which is obtd. at No.1 stage to a separate inner die 11 and by pressing it with a forming punch 12 on the plane face 4. The york 5 is fitted into an inner die 15 with turning over the formed article 14 at No.3 stage. In this case two outer dies 16 are in opening condition with being energized by springs 17, 17. When a heading slider 18 is descended, then, the wedge 20 is descended prior to the forming punch 21 and brought into contact with the sliding face 23 of the opened outer die 16, binding the york 5 with pushing in arrow mark direction. A full enclosed die is formed as the outer die 16 and shaft forming die 24 with further descent of the wedge 20. The upsetting of the shaft 6 is performed by the forming punch 21 finally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a closed forging method for irregularly shaped parts such as yokes as automobile parts, and an apparatus for carrying out the forging method.

[Prior art]

Conventionally, odd-shaped parts such as yokes are formed using the normal die forging method, but many burrs appear around the formed product and are removed by trimming after stamping, resulting in material stagnation. bad. Therefore, in order to improve the yield, a closed forging method using an abscenter may be considered, but because of the upper and lower grid dies, the yoke l is
・・Paris is formed in the device indicated by the mark. Also, from Fig. 7-■, which shows a side view from direction A in Fig. 7-■, it appears that upsetting molding with a general closed mold is possible; As shown in Figure 7 - ■, it is impossible to remove the yoke ■ from the mold due to the protruding step part 2, and in the end, the above method cannot produce a molded product with a protruding step part. .

[Purpose of the invention]

The present invention has been made in view of the current state of the prior art as described above, and provides a closed forging method that enables simultaneous forming in the axial direction and a direction perpendicular to the axis without using an absetter, and an apparatus for implementing the method. The purpose is to provide the following.

[Structure of the invention]

That is, the closed forging method for irregularly shaped parts of the present invention includes a first step of upsetting one end of a steel material to form a flat part, and further upsetting the flat part with an upper die punch having a predetermined convex shape. A second step in which the molded product obtained in the second step is reversed and the yoke portion that was upset forged in the previous step is restrained by the other end of the material that is connected to the yoke portion. The method is characterized by comprising a third step of upsetting the part onto the shaft part.

The first, second, and third steps described above are each performed using separate closed molds, but can be performed sequentially using the apparatus described below incorporating these molds. . The first step and the second step are carried out using a mold consisting of an ordinary outer die or an inch die and a forming punch.

The mold used in the third step is composed of an outer die that can be opened and closed in the horizontal direction and a shaft mold that moves in the vertical direction. Then, the outer die is fixed to, for example, a heading slider and is closed inward while sliding with a wedge portion that precedes the forming punch. On the other hand, the shaft molding die is fixed to the inside of the wedge part and descends before the shaping punch.

In this way, the device of the present invention is a double-acting type in which the yoke part molded in the second step is restrained by a closed outer die, and a closed mold is formed by the outer die and the shaft part molding die that has been lowered until it comes into contact with the yoke part. It has the structure of In other words, the closed forging device of the present invention includes a closed die consisting of an outer die and an inner die for forming a yoke portion, and an outer die and a shaft forming die for constraining the yoke portion of an inverted intermediate molded product and forming a shaft portion. It is characterized by having a closed type consisting of.

〔Example〕

The method and apparatus of the present invention will be explained below with reference to the drawings.

FIG. 1 shows the shape of a molded product in each step constituting the method of the present invention. That is, in the first step, the plane portion 4 is formed from the 1± material 3, in the second step, the yoke portion 5 is formed, and in the third step, the shaft portion 6 is formed. The reason why the yoke portion 5 is not directly molded from the material 3 is to avoid uneven thickness of the yoke portion 5.

FIG. 2-■ shows the state in which the material 3 is attached to the inner diamond in the first step. Note that 8 represents an outer die, and 9 represents a forming punch. FIG.

FIG. 3-■ and FIG. 3-■ explain the second step. The molded product 10 obtained in the first step is transferred to the inner die 11 in FIG. is pressed to form the yoke part 5 as shown in FIG. Note 1
3 indicates an outer die.

FIGS. 4-1 to 4-2 show the process of forming the shaft portion 6 by upsetting the 14 molded products obtained in the second process.

That is, as shown in FIG. 4-2, the molded product 14 is inverted, and the yoke portion 5 is fitted into the inner die 15 as shown in FIG. The two outer dies 16.18 are attached to respective springs 17. It is in an open state as it is urged in a direction away from the molded article 14 by I7.

In FIG. 4-■, when the -'-/ding slider 18 is lowered by a drive mechanism (not shown), the spring 18
The wedge portion 20 urged downward by the forming punch 2
It descends ahead of 1. There, the sliding surface 22 of the wedge portion 20 comes into contact with the sliding surface 23 of the opened outer die I6, and without sliding against each other, pushes the outer die 1'8.18 in the direction of the arrow and restrains the yoke portion 5. .

When the sea urchin part 20 further descends and reaches the bottom dead center, as shown in FIG.
Shape the closed type with and. Finally, in FIG. 4--2, the spring 25 is compressed and the shaft portion 6 is upset by the forming punch 21. Figure 6 shows the yoke 1 with the shaft 6 installed.
represents a perspective view of.

〔Effect of the invention〕

As described above, the method of the present invention basically uses an upsetting method, but since it uses a closed mold different from the conventional upsetter, no flaking occurs and the yield is improved. Furthermore, since the yoke portion and the shaft portion are molded using separate closed molds, even odd-shaped parts having a protruding stepped portion between the yoke portion and the shaft portion can be freely molded. Furthermore, since the device of the present invention has a double-acting mechanism consisting of a mold that moves in the axial direction and a mold that moves in a direction perpendicular to the axial direction, the object to be molded is restrained and formed continuously, and irregularly shaped parts can be formed. Suitable for mass production.

[Brief explanation of drawings]

FIG. 1 shows an explanatory diagram of changes in shape of a molded product accompanying the process of the present invention. Figure 2 - ■ represents a cross-sectional view of the mold at the start of the @l process, Figure 2 - ■ represents a cross-sectional view of the mold at the end of the first process, and Figure 3 - ■ represents the cross-sectional view of the mold at the start of the second process. Figure 3-■ represents a cross-sectional view of the mold at the end of the second process, Figure 4-■ represents a cross-sectional view of the mold at the start of the third process, and Figure 4-q ) represents a cross-sectional view of the mold when the yoke is restrained, Figure 4-■ represents a cross-sectional view of the mold when the mold has been closed, and Figure 4-■ represents the cross-sectional view of the mold at the end of the third step. A sectional view is shown, FIG. 5 is a perspective view of the intermediate molded product set in the inner die, and FIG. 6 is a perspective view of the yoke at the end of molding. Figure 7-■ represents a perspective view of the yoke formed by the upsetter, Figure 7-■ represents a side view seen from direction A in the above figure, and Figure 7-■ represents the same <viewed from direction B. represents a side view. In the figure, l...Yoke 2...Stepped part 3...Material 4...Flat part 5...Yoke part 6...Shaft part 7...Inner die 8...Outer die 9...・Forming punch 1o...molded product 11...inner die 12
... Molding punch 13 ... Outer die 14 ... Molded product I5 ... Inner die 16 ... Outer die 17
... Hane 18 ... Head slider 18 ...
/<Ne 20... Wedge part 21... Forming punch 2
2, 23...Sliding surface 24...Shaft mold 25.
...Spring patent applicant Toyota Motor Corporation (and 1 other person) Fang 1 Fig. 1: Kutsu 2nd work time Sa 3 Work Mei Fang 2 Fig.
Sai 3 diagram Sai 4 diagram ■ ■ Fang 5 diagram O 6 diagram Fang 7 diagram ■ ■

Claims (2)

[Claims] (1) A first step of upsetting one end of the steel material to form a flat part, and a second step of upsetting the flat part with an upper die punch having a predetermined convex shape to form a yoke part. Step 2, and a step in which the molded product obtained in the second step is reversed and the yoke portion that was upset forged in the previous step is restrained with a mold, and then the other end of the material that is continuous with the yoke portion is upset onto the shaft portion. A closed forging method for irregularly shaped parts, which is characterized by the following steps: (2) A closed mold consisting of an outer die and an inner die for forming the yoke part, and an outer die and a shaft forming mold for restraining the yoke part of the inverted intermediate molded product and forming the shaft part. A closed forging device characterized by being equipped with a closed die.