JPS61126939A - Manufacture of stepped shaft-like product - Google Patents

Abstract

PURPOSE:To efficiently manufacture a stepped shaft-like product having an axially asymmetrical shape, by drawing down a round bar-like blank material by means of an axially asymmetrical-section forming section after thread rolling works are performed on the outer peripheral surface of the blank material by means of stepped-section forming sections provided on the outer surfaces of rotary dies while the outer peripheral surface of the blank material is pushed by the dies. CONSTITUTION:A round bar-like blank material 23 is put between a pair of rotary dies 21 and 21 respectively equipped with stepped-section forming sections 22 and 22 and axially asymmetrical-section forming sections 23 and 23 on the outer surfaces and the outer peripheral surface of the blank material is pushed by the dies. Then the rotary dies 21 and 21 are rotated in the same direction and an axially symmetrical stepped shaft-like semimanufactured product 27 is formed by thread rolling works. Thereafter, the above-mentioned axially asymmetrical-section forming sections 23 and 23 of the rotary dies 21 and 21 are faced to the outer peripheral surface of the semimanufactured product 27 and the rotation of the dies is stopped. After the dies 21 and 21 are stopped, the interaxis distance of the rotary dies 21 and 21 is made narrower by drawing down devices 24 and 24, and the above-mentioned axially asymmetrical-section forming sections 23 and 23 are pushed against the outer surface of the product 27 and an axially asymmetrical stepped shaft-like product 28 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention (first invention, second invention) relates to a method of manufacturing an axially asymmetric stepped shaft-shaped product.

[Conventional technology]

BACKGROUND ART Conventionally, a rolling method (cross rolling method) has been used to manufacture stepped shaft-shaped products using a rolling machine (cross rolling machine). In this method, a round bar-shaped material is inserted between a plurality of rotating dies each having a predetermined step-forming part on the outer surface, and the outer circumferential surface of the round-bar-shaped material is compressed by the step-forming part of these rotating dies to rotate the bar-shaped material. This is a forming method in which a stepped shaft product of the desired shape is obtained by rotating a die and performing a rolling process.

This rolling method enables more efficient and precise molding than other molding methods, such as die forging, and significantly reduces manufacturing costs.

FIG. 7(a) shows an example of this, in which a pair of rotary dies 2 are formed with a stepped portion 1.1 of a predetermined shape on the outer peripheral surface.
, 2, a round rod-shaped material 3 is inserted between these rotating dies 2.
, 2's step forming parts 1, 1 press the outer circumferential surface of the round rod-shaped material 3 and rotate these rotary dies 2.2 in the same direction to obtain a stepped shaft-like product with the desired shape and dimensions. .

Further, FIG. 7(b) shows a stepped portion 11 having a predetermined shape on each plate surface.
．． 11 is formed using a pair of flat rotary dies 12.12, a round bar-shaped material 3 is inserted between both rotary dies 12.12, and a stepped portion of these rotary dies 12.12 is formed. By pinching the outer circumferential surface of the round bar material 3 at the portions 11° 11 and rotating both rotating dies 12 and 12 in opposite directions, a stepped shaft-like product having the desired shape and dimensions is obtained.

Figures 8 (a) to (C) show the relationship between the rotating die used in such a rolling method and the process of forming a round bar-shaped material, and Figure 8 (a) is similar to Figure 7 (a). A vertical cross-sectional view of the step forming part 1 of the rotary die 2 shown in FIG.
The developed plan view of FIG. In the figure, α indicates the forming angle of the step-forming portion 1, and β indicates the advancing angle of the step-forming portion 1. Also, Figure 8(d)
to (h) sequentially illustrate the forming process in which a stepped shaft-shaped product is obtained by rolling the center portion of the round bar-shaped material 3 from diameter d to diameter d.

[Problem that the invention seeks to solve]

The conventional rolling method shown in Figures 7 and 8 can only form stepped shaft-shaped products with axial symmetry, for example, Figures 9 (a) and (b) and Figure 10 (a). .

Stepped shaft-shaped product 2 with an asymmetrical shape as shown in (b)
In order to manufacture 8.29, after rolling, it is necessary to form an axially asymmetrical shaped part by forging, cutting, etc. as a post-process, which has led to the problem of poor manufacturing efficiency. In addition, the product 28 in FIG. 9 has an axially asymmetrical part 28a on the outer circumference.
The product 29 shown in FIG. 10 has axially asymmetrical portions 29a and 29b at the outer periphery and at the shaft end, respectively.

The present invention has been made to solve these problems, and an object of the present invention is to provide a method for manufacturing a stepped shaft-like product that can efficiently manufacture a stepped shaft-like product having an axially asymmetrical shape.

[Means for solving problems]

In order to achieve the above object, the method for manufacturing a stepped shaft-shaped product according to the first invention includes inserting a round bar-shaped material between a plurality of rotating dies each having a stepped part forming part and an axially asymmetric part forming part on the outer surface, After rolling an axially symmetrical stepped shaft-shaped semi-finished product by pinching the outer peripheral surface of the round bar-shaped material with the step forming portions of these rotating dies and rotating these rotating dies, the above-mentioned plurality of rotating dies are used. The rotation of the rotating die is stopped by placing the axially asymmetrical portion forming portion opposite to the outer circumferential surface of the stepped shaft-shaped semi-finished product, and by narrowing the distance between the axes of these rotating dies, the axially asymmetrical portion forming portion is formed into a stepped axially shaped semi-finished product. It is characterized by pressing against the outer peripheral surface of a semi-finished product to obtain an axially asymmetrical final product.

Further, in the method for manufacturing a stepped shaft-like product according to the second invention, after rolling an axially symmetrical stepped shaft-like semi-finished product in the same manner as in the first invention, the axially asymmetrical portion forming portion of the plurality of rotating dies is The rotation of the rotating dies is stopped facing the outer peripheral surface of the stepped shaft-shaped semi-finished product, and the symmetrical part forming portions of these rotating dies are pressed against the outer peripheral surface of the stepped shaft-shaped semi-finished product. It is characterized by pressing a mold of a predetermined shape against the end face of a shaft-shaped semi-finished product from the axial direction to obtain an axially asymmetrical final product.

(Effect of the invention) In the method of the first invention, first, an axially symmetric stepped shaft-shaped product is rolled, and then the axially asymmetric parts of a plurality of rotary dies are pressed against the outer periphery of the shaft-shaped semi-finished product to indent it. By this, an axially asymmetrical final product is obtained, and in the method of the second invention, the axially asymmetrical portions of a plurality of rotating dies are pressed against the outer periphery of the shaft-shaped semi-finished product to form a recess, and a rolling device is used to form the stepped product. Since an axially asymmetric final product is obtained by pressing a mold of a predetermined shape against the end face of a shaft-shaped semi-finished product from the axial direction, there is no need for forging, cutting, etc. as a post-rolling process. It is possible to efficiently manufacture a stepped shaft-shaped product with an asymmetrical shape.

[Embodiments of the invention]

1 to 3 show an embodiment of the method of the first invention.

A pair of rotating dies 21.21 are shown in FIG. 2(a).

As shown in (b), a stepped portion 2 having a predetermined shape is formed on each outer peripheral surface.
2.22 and an axially asymmetrical portion forming portion 23.23. These rotating dies 21.21 have mutual shafts 21a,
21a are kept in a parallel state, it is possible to change the distance between the axes from each other by means of the lowering devices 24, 24.

In addition, 25 in FIG. 1 is a round bar-shaped material that is a material for the stepped shaft-shaped product, and 26 is a material support device.

Therefore, the round rod-shaped material 25 is, for example, shown in FIG. 9 (a>,
In order to obtain an axially asymmetric stepped shaft-shaped product as shown in FIG. 3(b), first a pair of rotating dies 2 are
1. Insert the round rod-shaped material 25 between 21 and
As shown in c), the outer circumferential surface of the round bar-shaped material 25 is pressed between the stepped portions 22 and 22 of these rotary dies 21 and 21, and these rotary dies 21 and 21 are aligned with each other by a rotary drive device (not shown). By rotating in the direction, the axially symmetrical stepped shaft-shaped semi-finished product 27 is rolled. Thereafter, the rotation of the self-rotating die 21.21 is stopped by applying the axis asymmetrical portion forming portion 23.23 of the self-rotating die 21.21 to the outer peripheral surface of the stepped shaft-shaped semi-finished product 27, and the rolling device 24.24 When the distance between the axes of the self-rotating die 21.21 is reduced as shown in FIG. An axially asymmetrical concave portion is formed in a part of the outer circumferential surface, and the final product 28 is axially asymmetrical and has the required shape and dimensions as shown in FIG.
is obtained.

According to the above method, it is not necessary to perform forging, cutting, etc. as a post-rolling process, and it is possible to efficiently manufacture a stepped shaft-shaped product having an axially asymmetrical shape.

FIG. 4 shows another embodiment of the first invention. This is an example of using a flat rotary die 31.31, and the self-rotating die 31.31 is provided with a stepped part forming part 32.32 of a predetermined shape and an axially asymmetric part forming part 33.33 on each plate surface. ing. These rotary dies 31, 31 are capable of changing the distance between their plate surfaces by means of a radial rolling device 34.34 while keeping their axes 31a, 31a parallel to each other.

Therefore, FIG. 9(a) is obtained from the round bar-shaped material 35.

In order to obtain an axially asymmetric stepped shaft-shaped product as shown in (1)), the round bar-shaped material 25 is inserted between the self-rotating dies 31.31, and the step forming portions 32. 32
An axially symmetrical stepped shaft-shaped semi-finished product is rolled by compressing the outer peripheral surface of the round bar-shaped material 25 between them and rotating these rotary dies 31 and 31 in the same direction with a rotation drive device (not shown). After that, the self-rotating die 31.31
The rotation of the self-rotating die 31.31 is stopped by arranging the axially asymmetrical portion forming portion 33.33 of the stepped shaft-shaped semi-finished product to face the outer peripheral surface of the stepped shaft-like semi-finished product, and the rolling device 34.34 is driven to remove the self-rotating die 31.31. When the distance between the plate surfaces of 31 is narrowed, the axially asymmetrical portion forming portion 33.33 is pressed against the outer circumferential surface of the stepped shaft-shaped semi-finished product, and an axially asymmetrical recess is formed in a part of the outer circumferential surface. A final product 28 having the required shape and dimensions and axially asymmetrical as shown in FIG. 9 is obtained.

According to the above method, there is no need to perform forging, cutting, etc. as a post-rolling process, and it is possible to efficiently manufacture a stepped shaft-shaped product having an axially asymmetrical shape.

Next, an embodiment of the second invention is shown in FIGS. 5 and 6.
As shown in the figure.

In this embodiment, a rotary die 21, 21 similar to that in the embodiment shown in FIGS. 1 to 3 is used, and a pressing device is used to press molds 41, 41 of a predetermined shape onto both ends of the round bar material 25 from the axial direction. 42.42 will be installed.

Therefore, from the round bar-shaped material 25, for example, as shown in FIG.
, In order to obtain the axially asymmetric stepped shaft-shaped product 29 as shown in FIG. 6(b), first, as shown in FIG. The same figure (b
), the outer circumferential surface of the round bar material 25 is pressed between the stepped portions 22 and 22 of these rotary dies 21 and 21, and these rotary dies 21 and 21 are rotated in the same direction with a rotary drive device (not shown). The axially symmetrical stepped shaft-shaped semi-finished product 27 is rolled by rotating it. Thereafter, the rotation of the two rotary dies 21.21 is stopped by making the axis asymmetrical portion forming portion 23.23 of the two rotary dies 21.21 face the outer peripheral surface of the stepped shaft-shaped semi-finished product 27, and the rolling device 24.24 is driven to narrow the distance between the axes of both rotary dies 21.21 as shown in FIG. As shown in d), the axial reduction devices 42 and 42 are driven to press the molds 41° 41 against both ends of the stepped shaft-shaped semi-finished product 27 from the axial direction. As a result, axially asymmetrical portions 29a and 29b are formed on the outer circumferential surface and both ends of the stepped shaft-shaped semi-finished product 27, respectively, and a final product 29 having the required shape and dimensions and axially asymmetrical as shown in No. 10 is obtained.

According to the above method, it is not necessary to perform forging, cutting, etc. as a post-rolling process, and it is possible to efficiently manufacture a stepped shaft-shaped product having axially asymmetrical parts 29a, 29b on the outer peripheral surface and both ends. I can do it.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the first invention, in which FIG. 1 is a schematic configuration diagram of a manufacturing apparatus, and FIGS. 2(a) and 2(b).
) are a perspective view and a sectional view showing the rotating die of the above device,
Figures 3 (a) to (d) are schematic diagrams and schematic diagrams showing the molding method for an axially asymmetric stepped shaft-shaped product; Figures 6 (a) to (d)
is a schematic diagram showing the molding method of an axially asymmetric stepped shaft-shaped product,
Figures 7 and 8 show conventional examples, and Figure 7 (a
)(b) is a schematic configuration diagram of a manufacturing apparatus showing different conventional examples, FIG. 8(a) is a partial cross-sectional view of a step forming part formed on a rotary die, and FIG. A developed plan view of the forming part, the same figure (C) is a CC sectional view of the same figure (b), the same figure (d
) to (1-1) are plan views showing the step-by-step molding process of an axially symmetrical stepped shaft-shaped product, and the figures in FIGS. 9 and 10 (
FIG. 9a) is a plan view showing an example of an axially asymmetric stepped shaft-like product, and each of FIGS. 9 and 10 (b) is a side view of each of the above-mentioned axially asymmetric stepped shaft-like products. 21.31...Rotating die, 22.32...Step part forming part, 23.33...Axis asymmetric part forming part, 24°34
．． 41... Reduction device, 25... Round bar-shaped material, 27.
... Axis-symmetric stepped shaft-shaped semi-finished product, 28.29... Axis-symmetric stepped shaft-shaped product, 42... Mold. Applicant Sub-Agent Patent Attorney Takehiko Suzue 1K 1 Figure 2 (a) (b) (c)
(d) (C)
(d) Figure 7 (b) Figure 8 (a) (b) Busy)

Claims (2)

[Claims] (1) A round bar-shaped material is inserted between a plurality of rotating dies each having a step forming part and an axially asymmetric part forming part on the outer surface, and the outer peripheral surface of the round bar-shaped material is sandwiched between the step forming parts of these rotating dies. After rolling an axially symmetrical stepped shaft-shaped semi-finished product by pressing and rotating these rotating dies, the axially asymmetric portion forming portions of the plurality of rotating dies are formed on the outer peripheral surface of the stepped shaft-shaped semi-finished product. The axially asymmetrical portion forming portion is pressed against the outer peripheral surface of the stepped shaft-shaped semi-finished product by stopping the rotation of the rotating dies while facing each other and narrowing the distance between the axes of these rotating dies to obtain an axially asymmetrical final product. A method for manufacturing a stepped shaft-shaped product. (2) A round bar-shaped material is inserted between a plurality of rotating dies each having a step forming part and an axially asymmetric part forming part on the outer surface, and the outer peripheral surface of the round bar-shaped material is sandwiched between the step forming parts of these rotating dies. After rolling an axially symmetrical stepped shaft-shaped semi-finished product by pressing and rotating these rotating dies, the axially asymmetric portion forming portions of the plurality of rotating dies are formed on the outer peripheral surface of the stepped shaft-shaped semi-finished product. By stopping the rotation of the rotating dies while facing each other and narrowing the distance between the axes of these rotating dies, the axis-asymmetric portion forming portion is pressed against the outer circumferential surface of the stepped shaft-shaped semi-finished product, and a rolling device is used to press the shaft-asymmetric half-finished product with steps. A method for manufacturing a stepped shaft-shaped product, characterized by pressing a mold of a predetermined shape against the end face of the product from the axial direction to obtain an axially asymmetrical final product.