JPS60118346A - Method and device for working stepped shaft - Google Patents

Abstract

PURPOSE:To reduce man-hour for working, and also to improve a strength of a product by providing roll-shaped metallic dies on the same axis, making them movable in the opposite direction to each other, pressing a rotating shaft stock and working a shaft. CONSTITUTION:Roll-shaped metallic dies 21, 22 which can be pressed freely to a shaft stock 10 are provided in parallel on the same axis, and also supported so as to be freely movable in the opposite direction. These metallic dies 21, 22 are pressed against the stock 10 driven to rotate round the axis. Subsequently, the stock 10 and the metallic dies 21, 22 are moved relatively in the axial direction. As a result, it is formed to a stepped shaft 1 having a large diameter part and a small diameter part. In this way, man-hour for working is reduced, and also since the shaft stock 10 is not cut, the stock flow flows along the stepped part, and a strength of a product is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for molding a stepped shaft using a roll mold.

Conventionally, as shown in Fig. 1, the interaxial length Ao+4+4, tl
, t, and large diameter length 4 + Ls + 4 t 4
When forming the stepped shaft 1 having different values, it is usually formed by mechanical grinding or forging. However, such mechanical grinding and forging have problems such as poor material yield and complicated processing steps, and furthermore, it is difficult to say that it is an optimal processing method in terms of product strength.

The present invention solves the problems seen in the conventional processing method by molding a stepped shaft using a roll-shaped mold. The shaft material and the roll-shaped mold are moved relative to each other in the axial direction after pressing a roll-shaped mold that rotates against the shaft material, thereby forming a large-diameter part and a small-diameter part. In an apparatus for processing a shaft material by pressing a roll-shaped die into the shaft material, roll-shaped dies supported in a freely compressible manner relative to the shaft material are provided in parallel on the same axis, and these roll-shaped dies are They are characterized in that they are supported movably in opposite directions.

The present invention will be described in detail below based on embodiments shown in the drawings. FIGS. 2(a) to 2(e) show the molding steps of the molding method according to the present invention. As shown in the figure, a shaft material 10 is machined into a small diameter portion 11 and a large diameter portion 12 in the order of (a) to (e), and finally a predetermined stepped shaft is formed.

In this case, the shaft diameter d of the shaft material 10 and the maximum diameter of the stepped shaft, which is a molded product, are both equal, or one of them is larger. Or they can be small < (d ≦ D), and are independent of each other's size.

Next, the specific processing procedure of the above-mentioned molding process is shown in FIGS. 4 to 6. FIGS. 4(a) and 4(b) show an example in which the small diameter portion is molded using two sets of roll-shaped molds. In the figure, the shaft end of the shaft material 10 is held by a chuck device 20 so as to be rotatable in multiple directions and movable in the axial direction. Roll-shaped molds 21 a and 2 are driven and rotated on both sides of the shaft material 10 .
l b , 22a.

22b is provided. The roll-shaped mold 21a.

21b, 22a, 22b are supported movably in a substantially straight path with respect to the axial direction of the shaft wood 10, and each roll-shaped mold 21
A to 22b each have a pressure reduction or pressure release device 2.
3 is attached to each roll mold 21a to 22.
b is attached to the shaft material 10 so as to be freely compressible.

Further, the roll-shaped molds 21a and 21b are respectively provided in parallel on the same axis, in close contact with each other, and movable along the axial direction of the shaft material 10. Further, the other roll-shaped molds 22a and 22b have a similar configuration.

In the above configuration, as shown in FIG. 4(a), the roll-shaped mold 21a is in close contact with the shaft material 10 which is rotated by the chuck device 20.

21b, 22a, and 22b are rotated and pressed to start machining. Subsequently, as shown in FIG. 4(b), the roll-shaped molds 21a and 21b are moved parallel to the shaft material 10 and in opposite directions to form a small diameter portion having the shaft diameter d0. When the processing progresses by a predetermined length t in this manner, the device 23 releases the pressure of the roll-shaped molds 21a to 22b against the shaft material 10, and the four-role molds 21a to 22b are released from the press against the shaft material 10.
- 22b is moved to the side of the shaft material 10 and moved along the axial direction to the next machining position, and then starts the next machining in the same manner as described above.

Next, FIG. 5(b) shows an example of a molding process in which a pair of roll-shaped molds 21a and 21b arranged on the same axis with respect to the shaft material IO are separated by a predetermined distance. The roll-shaped molds 21a and 21b are disposed parallel to and on the same axis with respect to the shaft material lO, and the roll-shaped molds 21& and 2
1b and are separated from each other by a predetermined distance. Roll-shaped molds 22m and 22b are similarly arranged on the other side of the shaft material 10. The other configurations are the same as those in FIGS. 4(a) and 4(b).

In the above configuration, as shown in FIG. 5(a), the roll-shaped molds 21m and 21b, which are separated by a predetermined distance, are rotated and pressed against the shaft material lO, which is rotated many times by the chuck device 20, and processing is started. . In this case, the roll molds 21m and 2
A large diameter portion of the shaft diameter opening is formed in the portion of the shaft material 10 located between the shaft material 1b and the shaft material 1b. Subsequently, as shown in FIG. 5(b), the roll-shaped molds 21a to 22b are moved in parallel with the shaft material 10 and in opposite directions to form a small diameter portion having the shaft diameter d.

Figures 6(a) and 6(b) show a case where one roll-shaped mold 2.1a is provided on the side of the shaft wood 10, and one roll-shaped mold 2.1a is provided on the opposite side. It is provided. As shown in FIG. 6 (&) (b), these roll-shaped molds 21a,
The shaft material 22a is pressed by the rotating shaft material lO and moved along its axial direction to process and form a small diameter portion.

Next, FIGS. 7(a) and 7(b) show an example in which flanges 24a and 24b are provided at the center of the axis of the roll mold 246D and the outer shape of the large diameter portion is constrained. The roll-shaped mold 24t-111L%7 direction number shown in Fig. 7 (&) is shown in Fig. 7 (&).
0) any diameter cio s dl + a, as shown in
A stepped shaft 1 having a diameter of 1d4 can be fabricated. Furthermore, Fig. 8(a), Fig. 9(a), Fig. 10
Roll-shaped molds of various shapes shown in @(a) 26.27.
By using 28, the stepped shaft 1 having the shapes shown in FIGS. 8(b), 9(b), and 10(b), respectively, can be formed.

Each of the above embodiments relates to processing examples using two sets of upper and lower processing rolls (f-h) in which roll-shaped molds are arranged on both sides of the shaft material 100, but the processing method and apparatus of the present invention are not limited to this. As shown in FIG. 11, roll-shaped molds 29a, 29b, and 29c may be provided on three sides of the outer periphery of the shaft material 10, respectively.

Further, in each of the above embodiments, the case where the rolled mold is moved with respect to the shaft material 10 has been described, but the present invention is not limited to this, and the shaft material 10 may be moved in the axial direction without moving the rolled mold. Good too.

According to the processing method and apparatus of the present invention described above, the service shaft can be formed extremely easily, and the number of processing steps can be significantly reduced compared to conventional processing methods. Furthermore, Figure 12 (a
) As shown in Fig. 12(b), the conventional mechanical cutting method has the disadvantage that the material flow is broken at the stepped portions, resulting in weak product strength. Since the shaft material is not cut during the process, the material flow follows the step, which has the advantage of increasing the strength of the product.

[Brief explanation of drawings]

Figure 1 is a side view of the stepped shaft, Figure 2 (a) (b) (c
) (d) (e) is an explanatory diagram showing the molding process of the present invention,
Figure 3 (IL) is a side view of the shaft material, Figure (b) is a side view of the stepped shaft, Figures 4 (IL) Φ) to 6 (at (
b) is an explanatory diagram showing the processing procedure using the processing apparatus according to the present invention, FIG. Side views of the stepped shaft after molding, Figures 8(a) and 9(a), and Figure 1θ (&) are side views of various roll-shaped molds,
Figure (b), Figure 9 (b) and Figure 10 (b) are explanatory diagrams of the molding state, Figure 11 is an explanatory diagram of the arrangement of the roll mold, and Figure 12 (&) (b) is the raw material. It is an explanatory diagram of a flow. In the figure 1...Stepped shaft, 10...Shaft material, 21 a
*2 l b , 22 a , 22 b , 24
, Mantle 4126. 27.28 and 29a, 29b, 29
c・. - Le-shaped mold, 23... It is a rolling down or rolling down release device. Ward CN Ward Rinha

Claims (1)

[Claims] (1) After pressing a rotating roll mold against a shaft material that is rotationally driven around the axis, the shaft material and the roll mold are moved relative to each other in the axial direction, thereby forming a large diameter part and a small diameter part. A method for processing a stepped shaft characterized by forming. @) In a device that processes a shaft by pressing a roll-shaped mold onto a rotating shaft material, roll-shaped molds that are supported so as to be freely compressible against the shaft material are provided in parallel on the same axis, and these roll-shaped molds are A stepped shaft processing device characterized in that the molds are supported so as to be movable in opposite directions.