JPS63180424A - Machining method for input shaft - Google Patents

Abstract

PURPOSE:To enable application of spline rolling on a pipe material without deformation, by a method wherein the pipe material is held between a pressed nip formed by a pair of flat cutters, and the cutters are relatively moved in a direction, extending at right angles with the axis of the pipe material, from its top side toward its bottom side. CONSTITUTION:After the outer periphery of a pipe material, cut in a given length, is cut in a given shape to form a secondary work 6, a polishing work is made on the spline forming part and the bearing engaging part of the outer periphery of the secondary work 6. A pair of flat cutters J are positioned facing each other in a direction extending perpendicularly to the axis of the secondary work 6, and the secondary work 6 is pressed and nipped on the top side 10c side of each of a finish blade 10b, in which lines are drawn, of the flat dice J. Simultaneously, a pair of the flat cutters J are relatively moved toward the bottom side 10d of the finish blade 10b to rapidly form a spline, and a spline rolling work is effected with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a torque converter that is spline-fitted to, for example, a turbine runner and a front clutch drum of a torque converter constituting an automatic transmission, and is capable of transmitting power from a turbine. The present invention relates to an input shaft that transmits data to a clutch side, and particularly relates to a method of machining an input shaft having a hollow portion in the axial center.

(Prior Art) As a conventional art, there is a processing method shown in FIGS. 8 to 14.

That is, as shown in Fig. 8, a solid bar is cut into a cutting tool (A
) to form a primary workpiece 1 by cutting it to a predetermined length.
Next, as shown in FIG. 9, the outer periphery of the primary work 1 is cut using a cutting tool (B) to form a secondary work 2 as shown in FIG. 10, and then, as shown in FIG. (C), the outer periphery of the secondary work 2, especially its both ends, such as the spline forming parts 2a and 2b and the bearing fitting parts 2c and 2d, are polished, and then, as shown in FIG. 12, a pair of flat molds are polished. A tertiary workpiece 3 is formed by spline rolling the spline forming portions 2a and 2b of the polished secondary workpiece 2 using a die <D).

In the spline rolling process, as shown in FIG. 13, a large number of strip-shaped blades D2 are formed on the surface of a rectangular parallelepiped blade base D1 so that the height gradually increases from one longitudinal end to the other. A pair of flat dies D-D consisting of
The flat dies D and D are arranged on the outer peripheries of the spline forming parts 2a and 2b so as to be perpendicular to the axes of the spline forming parts 2a and 2b.
・While pressing and holding 2b, the spline rolling process is performed by relatively moving the blade D2 toward the higher level, that is, toward the finishing blade side.

Next, as shown in FIG. 14, there was a processing method in which a drill E was used to drill a hole in the axial center of the tertiary workpiece 3, thereby obtaining an input shaft 4 with a hollow axial center.

(Problems to be Solved by the Invention) The above conventional method uses a long, solid bar whose outer periphery is cut into a predetermined shape and spline rolled, and in the final process, a hole is drilled in the axial center of the bar. However, this drilling process required a great deal of time and required a high degree of skill.

An object of the present invention is to obtain a novel input shaft machining method that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

That is, a first step of cutting the pipe material to a predetermined length, a second step of cutting the outer periphery of the cut pipe material, a third step of polishing a predetermined part of the outer periphery of the cut pipe material, and a third step of polishing the outer periphery of the cut pipe material. and a fourth step of performing spline rolling processing on a predetermined location on the outer periphery of the pipe material, and the fourth step includes forming a pair of finishing blades in a substantially triangular shape in plan view with a large number of strip-shaped finishing blades. While pressing and holding the pipe material with a flat cutter,
The spline rolling process is performed on the outer periphery of the pipe material by relative movement from the top side to the bottom side in a direction perpendicular to the axis of the pipe material.

(Function) Since the present invention is constructed as described above, by cutting the outer circumferential portion of the pipe material cut to a predetermined length into a predetermined shape and performing spline rolling processing, the shaft center portion becomes hollow. You will get an input shaft.

In this case, spline rolling processing of pipe material is.

As each flat die advances in the processing direction, the amount of contact between the blade portion of each flat die and the pipe material gradually increases, and the splined portion of the pipe material is gradually extended in the axial direction.

Therefore, the force with which the blade of the flat die presses the pipe material in the axial direction during spline processing is reduced.

(Example) Embodiments of the present invention will be described below based on the drawings.

In the drawings, FIGS. 1 to 7 are process diagrams showing the processing method according to the present invention.

First, in the first step, as shown in FIG. 1, a pipe material is cut into a predetermined length using a cutting tool (F) to form a primary workpiece 5.

Next, in the second step, as shown in FIGS. 2 and 3, the left half of the outer periphery of the second workpiece 5 is held by the bits (G1), (G2), and (G3) in a horizontally inverted manner. and the right half are sequentially cut to form a secondary workpiece 6 as shown in FIG.

Next, in the third step, as shown in FIG.
H), both ends of the outer periphery of the secondary work 6, for example, the spline forming parts 6a and 6b and the bearing fitting parts 6c and 6d.
to be polished.

Next, in the fourth step, as shown in FIG. 6, the spline forming portions 6a and 6b of the polished secondary workpiece 6 are spline rolled using a pair of flat dies (J).
As shown in FIG. 7, an input shaft 7 having a hollow central portion is formed.

As shown in FIG. 6, the above-mentioned flat die J has a prismatic main body 10a consisting of a pair of upper and lower parts elongated in the direction of travel, and one half of which is raised in the shape of a triangular prism with the diagonal line (A) as the center. The finishing blade 10b, which has many uneven stripes on its surface, is applied from the top side 10c (front end) side to the bottom side 10d (
They are formed at equal pitches toward the rear end) and in a direction perpendicular to the direction of travel.

Then, each of the flat dies J-J is inserted into the secondary workpiece 6.
The above-mentioned spline forming portions 6a are arranged so as to face each other in a direction perpendicular to the axis of the spline forming portions 6a, and the secondary workpieces 6 are pressed and held on each top side 10c side and relatively moved toward the bottom side 10d. - Perform spline rolling processing on 6b.

According to the above embodiment, the pipe material is sequentially cut, outer diameter cut, and
If spline rolling is performed, an input shaft 7 with a hollow shaft center 1 will be obtained.

In this case, the spline rolling process of the pipe material, that is, the secondary workpiece 6, is performed as the finishing blades 10b and 10b of each flat die JJ advance in the processing direction.
The amount of contact between the secondary workpiece 6 and the secondary workpiece 6 gradually increases, and the spline forming portions 6a and 6b of the secondary workpiece 6 are gradually extended in the axial direction.

For this reason, when machining splines, the blade 1 of flat die J/J
The force with which 0b and 10b press the secondary workpiece 6 in the axial direction is reduced, and even if the secondary workpiece 6 is pipe-shaped, spline processing can be performed well without deforming it in the axial direction. can.

(Effects of the Invention) As is clear from the above description, according to the present invention, pipe material is sequentially cut, outer diameter cut, and spline rolled. No processing is required.

Furthermore, spline rolling is achieved by relatively moving a pair of flat cutters, each of which has a number of striped finishing blades formed on a substantially triangular blade base in plan view, from the top side toward the bottom side. Since the outer periphery of the pipe material is sequentially rolled in the axial direction, even if the pipe material has a hollow portion in the axial center, it can be spline rolled without being deformed.

Therefore, the present invention has the effect that an input shaft having a hollow portion in the axial center can be processed quickly and with high precision.

[Brief explanation of the drawing]

Figures 1 to 7 show the processing method according to the present invention, with Figure 1 being the first process diagram showing the pipe material cut to a predetermined length, and Figures 2 and 3 showing the outer diameter of the pipe material. 2nd process drawing showing the cutting state, Fig. 4 is a partial cross-sectional front view of the pipe material processed in the 2nd process, Fig. 5 is the 3rd process drawing showing the polishing state, and Fig. 6 is the rolling process. 4th process diagram showing the machining state, FIG. 7 is a partial cross-sectional front view of the input shaft machined in the 4th process, FIGS. 8 to 14 show the conventional machining method, and FIG. 8 is a bar An explanatory diagram showing the state in which the material is cut to a predetermined length, FIG. 9 is an explanatory diagram showing the cutting state of the outer diameter, and FIG. 10 is a front view of the bar processed according to FIG. 9.
FIG. 11 is an explanatory diagram showing the polishing state, FIGS. 12 and 13 are explanatory diagrams showing the rolling process state, and FIG. 14 is an explanatory diagram showing the state in which the holes are marked. 5 Primary work, 6: Secondary work, 7: Input shaft, F-Gl/G2/G3: Bit, H: Grindstone, flat die, 10a: Main body, 10b: Finishing blade, 10
c: top side, 10d: bottom side. Application agent Hisashi Matsumoto Figure 1 Figure 2 Figure 3 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. A first step of cutting the pipe material to a predetermined length, a second step of cutting the outer periphery of the cut pipe material, a third step of polishing a predetermined part of the outer periphery of the cut pipe material, and a polishing step. and a fourth step of performing spline rolling processing on a predetermined location on the outer periphery of the pipe material, and the fourth step includes forming a pair of finishing blades in a substantially triangular shape in plan view with a large number of strip-shaped finishing blades. The pipe material is pressed and clamped by a flat cutter, and the outer circumference of the pipe material is spline rolled by moving the pipe material from the top side to the bottom side in a direction orthogonal to the axis of the pipe material. How to process input shaft.