JPH02147128A - Working method for bearing in pressing - Google Patents

Abstract

PURPOSE:To increase the strength of a hole part and to work a high-precision hole as a bearing part by putting the thickness part near a prepared hole of a metallic plate in plastic flow toward the central part of the prepared hole in a coining time. CONSTITUTION:After or while the prepared hole is worked on the metallic plate 1, a bearing part is burred and a projected hole part 2 is provided on one side. Both upper and lower sides of the projected part 3 are coined by upper and lower dies and recessed parts 2a, 2b are formed on the upper and lower end faces of the hole part 2 of the metallic plate 1. At this time, a tapered part formed by burring is removed from the hole part 2, a cylindrical part of complete roundness is formed in the central part of the hole part 2 and a high-precision bearing is worked. Besides, since in a coining time the thickness part of the metallic plate 1 flows plastically toward the central direction of the hole part 2 to constitute the bearing part, simultaneously with the working of the high-precision hole, the strength of the hole part increases and bearing performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bearing machining method in a press machine, and particularly to a bearing machining method for electronic mechanical parts.

[Prior Art] What is shown in Fig. 5 is a bearing formed by a conventional processing method, but as shown in the figure, the bearing hole (A) is formed by burring a metal plate 00). ing.

[Problems to be Solved by the Invention] In the above conventional example, since the bearing hole ridge formed in the metal plate 00) is formed by burring, the bearing hole 00) is
1) exhibits a tapered shape as shown by the two-dot chain line.

That is, when burring is used, the bearing hole (G) inevitably becomes tapered due to the characteristics of the burring process, so that it cannot be expected to function as a high-precision bearing.

Therefore, a technical problem arises that must be solved in order to configure a high-precision bearing portion without the bearing hole (a) exhibiting a tapered shape.This invention aims to solve this problem. purpose.

[Means for Solving the Problems] This invention has been proposed to achieve the above object, and involves performing a burring process on the hole after or simultaneously with preparing a hole in a metal plate. The protrusion is made to protrude in one direction, and the protrusion is then coined using upper and lower dies.
In the press working, the inside of the metal plate near the pilot hole is made to plastically flow toward the center of the pilot hole to form a thick wall during the coining process, and the hole is finished with high precision. The purpose of this paper is to provide a bearing machining method that can be used.

[Operation 1] The bearing portion is burred after or during the drilling of the metal plate so that the hole protrudes in one direction. Since the upper and lower surfaces of the protruding portion are coined using a die, the hole formed by the protruding portion has recesses formed at both upper and lower ends, and at the same time, the inside faces toward the center of the hole. This results in plastic flow, which increases the strength of the hole and does not create a tapered hole like the hole formed by burring, so high-precision hole machining for bearings can be expected. .

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the attached drawings. FIG. 1 shows a partially cutaway vertical cross-sectional view of the metal plate (+) with a prepared hole formed therein, and as shown in the cross-sectional view of FIG. 2) At the same time, burring is performed to make the chain hole (2) protrude to one side (3).
) can also be forced. Of course, the burring process shown in FIG. 2 may be performed after the preliminary hole process as shown in FIG. 1 is performed.

Next, pressure is applied to the metal plate (1) formed by the burring process shown in FIG. 2 between the upper die (4a) and the lower die (4b) shown in the cross-sectional view of FIG. Four parts (2a) and (2b) are formed on the upper and lower end surfaces of the hole (2) of the plate (1). At this time, part of the taper formed by the burring process in the hole (2) is removed, and a perfect circular cylindrical part is formed in the center of the hole (2), making it possible to hold a high-precision bearing. Processing is done. However, as shown in Fig. 4, the inside of the metal plate (+) becomes hole (2
), the bearing part (^) is formed by plastic flow toward the center of the hole (2).
The strength of the bearing can be increased and the bearing performance can be improved.

It should be noted that the present invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the present invention extends to such modifications.

[Effects of the Invention] In the present invention, after or simultaneously with the preparation of the hole in the metal plate, burring is performed to make the hole protrude from one side of the metal plate. Then, pressure is applied to this metal plate between the upper and lower coining dies, and a recess is formed on the upper and lower end surfaces of the hole, so that the center of the hole becomes a substantially perfect cylinder, making it possible to drill high-precision holes. Not only can the coining process be performed, but also the inside of the metal plate plastically flows toward the center of the hole during the coining process, thereby increasing the strength of the hole. In this way, it is also possible to improve the performance of bearings, especially for electronic mechanical parts.

Furthermore, when performing progressive processing, the processing can be performed within the same mold, resulting in good workability.

[Brief explanation of the drawing]

1 to 4 show the processing procedure of the present invention, in which FIG. 1 is a partially cutaway longitudinal sectional view showing pilot hole processing, FIG. 2 is a partially cutaway longitudinal sectional view showing burring processing, Figure 3 is a longitudinal sectional view showing the bearing part formed by coining process, Figure 4
The figure is a partially cutaway vertical sectional view of the upper and lower ties. FIG. 5 is a longitudinal sectional view showing a conventional bearing section.

Claims (1)

[Claims] After drilling a pilot hole in the metal plate, or at the same time as drilling the pilot hole, the hole is burred to protrude to one side, and further,
The protrusion is coined using upper and lower dies, and during the coining process, the metal plate near the pilot hole is plastically flowed toward the center of the pilot hole to form a thick wall.
A bearing processing method in press processing characterized by finishing the hole portion with high precision.