JPH0450132B2 - - Google Patents

Description

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

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

That is, as shown in FIG.
Then, as shown in FIG.
The outer circumference of the primary workpiece 1 is cut by cutting the first
A secondary workpiece 2 as shown in FIG. 0 is formed, and then, as shown in FIG. The parts 2c and 2d are polished, and then, as shown in FIG. 12, the spline forming parts 2a and 2b of the polished secondary workpiece 2 are spline rolled using a pair of flat dies D to form the tertiary workpiece 3. form.

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 are disposed facing each other on the outer periphery of the spline forming portions 2a, 2b of the secondary work 2, perpendicular to the axes thereof, and each of the flat dies D, D is placed at a lower level of the blade D2. In other words, from the rough blade side, the spline forming part 2
A and 2b are pressed and held while being relatively moved toward the higher level of the blade D2, that is, toward the finishing blade side, and spline rolling processing is performed.

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. Since the holes were to be machined, there was a drawback that the drilling process required a great deal of time and required a high degree of skill.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel method for machining an input shaft that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is constructed 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. The pipe material is pressed and held by a flat die, and the outer periphery of the pipe material is spline rolled by moving the pipe material from the top side to the bottom side in a direction perpendicular to the axis of the pipe material. It is.

(Function) Since the present invention is configured as described above, if the outer circumferential portion of the pipe material cut to a predetermined length is cut into a predetermined shape and spline rolling processing is performed,
This results in an input shaft with a hollow shaft center.

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 of each flat die and the pipe material gradually increases, and the splined part 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) Hereinafter, an example of the present invention will be described 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 and right half of the outer periphery of the primary work 5 are sequentially removed while holding the primary work 5 horizontally inverted by the bits G1, G2, and G3. After cutting, the fourth
A secondary workpiece 6 as shown in the figure is formed.

Next, in a third step, as shown in FIG. 5, both ends of the outer periphery of the secondary workpiece 6, such as the spline forming portions 6a and 6b and the bearing fitting portions 6c and 6d, are polished using a grindstone H.

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. An input shaft 7 having a hollow shaft center portion is formed.

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

Then, the flat dies J and J are arranged to face each other in a direction perpendicular to the axis of the secondary work 6, and while pressing and holding the secondary work 6 on each top side 10c side, By relatively moving toward the direction 10d, the spline forming portions 6a and 6b described above are subjected to spline rolling processing.

According to the above embodiment, by sequentially cutting the pipe material, cutting the outer diameter, and performing spline rolling processing, the input shaft 7 having a hollow shaft center portion can be obtained.

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

For this reason, when machining splines, flat dies J.
The force with which the blades 10b and 10b of J 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 do.

(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.

Moreover, spline rolling is achieved by relatively moving a pair of flat dies, each of which has a substantially triangular blade base in plan view and a large number of striped finishing blades, from the top side to 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, spline rolling processing can be performed without deformation.

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. The second process diagram showing the cutting state, Figure 4 is the second
A partial cross-sectional front view of the pipe material processed in the process, FIG. 5 is a third process diagram showing its polished state, FIG. 6 is a fourth process diagram showing its rolling state, and FIG.
The figure is a partial cross-sectional front view of the input shaft processed in the fourth step, Figures 8 to 14 show the conventional machining method, and Figure 8 shows the bar material cut to a predetermined length. FIG. 9 is an explanatory diagram showing the state of cutting the outer diameter of the bar, FIG. 10 is a front view of the bar machined according to FIG. 9, and FIG. 12 and 13 are explanatory diagrams showing the rolling state, and FIG. 14 is an explanatory diagram showing the drilling state. 5: Primary work, 6: Secondary work, 7: Input shaft, F, G1, G2, G3: Byte,
H: Grindstone, J: Flat die, 10a: Main body, 10
b: Finished blade, 10c: Top side, 10d: Bottom side.

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 polished pipe. a fourth step of spline rolling processing a predetermined location on the outer periphery of the material;
In the fourth step, the pipe material is pressed and held by a pair of flat dies each having a substantially triangular blade base formed with a large number of strip-shaped finishing blades, and the pipe material is pressed and held from the top side to the bottom side. A method for machining an input shaft, characterized in that spline rolling is performed on the outer periphery of a pipe material by relative movement in a direction orthogonal to the axis of the pipe material.