JPS58120411A - Manufacturing method of oval-shaped shaft - Google Patents

Abstract

PURPOSE:To mass-produce members used for electronic component parts of variable condensers, printers, etc., in a highly accurate manner, by machining two plane surfaces of a cylindrical basic material simultaneously by means of cutting edges rotating on these plane surfaces. CONSTITUTION:To manufacture an oval-shaped shaft 2 with a cylindrical basic material 1 ground, first the cylindrical basic material being cut into the specified length is secured tight in the space between chucks 11 and 11 being installed on a material stand 10. Then, a tool rest 9 is shifted while a rotary shaft 12 is set in motion and cutting edges 13 contact two plane surfaces of the basic material 1 whereby the material stand 10 is as well shifted in an arrow direction along a guide groove 8a, so that machining is over. That is to say, these cutting edges 13 and 13 in rotation are pressed against the two plane surfaces of the basic material 1 while they are shifted, thus both plane surfaces are machined at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an oval shaped shaft, and in particular to a variable capacitor,
This invention relates to a method of manufacturing oval-shaped shafts used in electronic parts such as printers.

In general, the oval shape axis is a cylindrical base material (1
) as shown in Figure 2 by the method described later.
8) and (4), and the method is to create an oval-shaped hole (see Fig. 3) by drawing.
A method of temporarily manufacturing a cylindrical base material (1) shown in FIG. 1 through a hole (5a) as shown in FIG. The cylindrical base material (1) is
As shown in the figure, mounting in a vise (6) involves grinding one surface (8) by rotating the whetstone (7), and grinding the other surface (4) by rotating the grindstone (7) temporarily. There were two methods.

However, in the former case, the cylindrical base material (1) is passed through the hole (5a) of the oval-shaped die (5) shown in FIG.
Since the cylindrical base material (1) is pulled out, there are no restrictions on the length or diameter of the cylindrical base material (1), but it has the disadvantage that a highly accurate oval-shaped shaft cannot be required in terms of dimensional bulk, and in the latter case, the dimensional type is Although it is better than the former, it is not only limited by the length of the cylindrical base material, but also the - face (8) of the cylindrical base material (1) is ground by the grindstone (7), and then the cylindrical base material ( Turning 1) in half and grinding the other surface (4) requires 1 and 2 more steps, which has disadvantages such as time-consuming manufacturing.The present invention has been made in view of the above points. The above-mentioned drawbacks have been solved by employing the method described below.

Hereinafter, the present invention will be explained in detail using FIG. 6.

FIG. 6 is a perspective view showing a processing machine with an oval shaped shaft. In the figure, (8) is the frame of the processing machine;
) is equipped with a tool rest (9), (9).
), tj) can move toward or away from each other. (8a) is a guide groove provided in the frame (8),
A material table (10) is slidably attached to the guide, 4 (8a).

In addition, chucks Ql) and Ql are fixed to the material table 110, and cylindrical base materials (
1) is firmly adhered to. Rotating axes t, t3, and u are attached to the tool rests (9) and (9), and these rotations are rotated by the rotational movement of a motor, etc., although not particularly shown in the figure.
The end mill 0 that becomes the cutting blade is fixed at the tip of the rotating shaft (12).
It transmits rotational motion to the book (13).

Then, the cylindrical base material (1) is ground to create an oval shaped shaft (2).
As shown in Fig. 6, first, a cylindrical base material (1) cut to a predetermined length is fixed between the material stand and the JOK-equipped chasokuro B1t, +υ, and then a cutter is Stand (9)
, (9) and rotate the rotating shafts 113 and tj3 so that the cutting blades q3 and u1 are still in contact with the two surfaces of the base material +1), and the material huttk kite n (8a) is moved in the direction of the arrow. Once moved, the machining is completed.

As shown above, the present invention presses the rotating cutting blades α3 and u4 against two planes of the cylindrical base material (1), and also presses the cutting blades (13, 0
Since both planes are processed at the same time by moving the machine, it is possible to obtain highly accurate oval-shaped shafts in a short time, making it suitable for mass production.

[Brief explanation of the drawing]

Diagram 1 shows the cylindrical base material, which is wood before processing. + Inkstone drawing, Figure 2 is a perspective view showing the axis of the oval shape after processing, Figures 3 to 5 show the conventional processing method, Figure 3 is a perspective view of the die, and Figure 4 is the use of the die. FIG. 5 is a perspective view showing an example using a grindstone, and FIG. 6 is a perspective view showing the manufacturing method of the present invention. (1) Cylindrical base material (2) Oval shaped shaft, (13 cutting blades (end mill)

Claims (1)

[Claims] In a method for manufacturing an oval-shaped shaft in which two planes of a cylindrical base material are machined, a rotating cutting blade is pressed against two planes of the cylindrical base material, and the cutting blade is moved to simultaneously machine the inner core l. A manufacturing method for the oval shaped shaft.