JPS61124726A - Manufacturing device of grooved fluid bearing - Google Patents

Abstract

PURPOSE:To enable a tool to both easily maintain its accuracy and serve for its use in response to a change of deformed size of a material, by fitting a multi-staged movable pin to a hollow part of the tool while holding balls, brought into contact with a multi-staged surface of said pin, by an elastically deformed ring. CONSTITUTION:A multi-staged movable pin 2 is fitted to a tool shank 1 by a screw, and the multi-staged movable pin longitudinally moved by its rotation in an axial direction by the screwing action, forming a contact surface with a ball 3 into a variable diameter. While the ball 3, being fitted to a hole in a circumferential direction of the tool shank 1, is closely attached further fixed always to the peripheral surface of the multi-staged movable pin 2, even if its diameter changed, by an elastic deformation ring 5 mounted to the periphery of the tool shank 1.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a manufacturing device for grooved hydrodynamic bearings that forms highly accurate grooves with minute plastic deformations on the surface of metal materials. be.

BACKGROUND OF THE INVENTION In recent years, methods and devices for manufacturing grooved hydrodynamic bearings have had a structure as shown in FIG. 3, for example.

That is, the ball 3 that contacts the circumferential portion of the fixing pin 2 is fitted into a hole 6 made in the circumferential direction near the tip of the tool shaft 1.
By caulking the outermost periphery of the tool shaft 10 hole 5, the ball 3
The groove 4 can be formed on the inner surface of the metal material 7 by fixing the metal material 7 to form an integral tool and rotating and moving the tool in a straight line.

Problems to be Solved by the Invention However, with such a structure, although the structure is simple and easy to manufacture, when the ball 3b is fixed by caulking, a gap 7 is created between the joint surface of the ball 3b and the fixing pin 2. The dimensional accuracy of the groove 60 may vary due to the dimensional accuracy of the tool and material properties, such as when the groove depth changes due to elastic deformation of the groove 5 machined into the metal material 4, or when the diameter of the ball 3 decreases due to wear. There was a problem in that it decreased.

That is, since rolling transfer is performed on the inner surface of the metal material 7, the dimensional accuracy of the other side is determined by the dimensional accuracy of the shape of the tool to be transferred. For these reasons, it is difficult to maintain tool precision, such as the adhesion (gap) between the ball 3b and the fixing pin 2, the amount of elastic deformation of the metal material 70, and wear on the ball surface.

Therefore, the present invention aims to create a structure in which the dimensions of the tool can be changed so that the tool precision can be easily maintained and the amount of elastic deformation of the material can be readily accommodated. The equipment for manufacturing grooved hydrodynamic bearings is
The hollow part fits into a tool shaft with a hollow part at the tip, and a cylindrical multi-stage movable pin with multiple diameters from the fitting part fits into a predetermined hole on the circumference near the tool shaft tip. It consists of a ball and an elastically deformable ring that brings the ball into close contact with a multistage movable bottle and fixes the ball, and the groove is formed by transfer processing of the ball.

Function: With the above-described configuration, the present invention allows the ball to be inserted into the circumferential hole near the tip of the tool shaft during tool assembly without applying any external force, and the elastic deformation ring keeps the ball constant on the contact surface of the multistage movable pin. The set length of the opposing balls is stabilized, and the accuracy of forming the grooves on the inner surface of the metal material by transfer processing is also stabilized. On the other hand, by sliding the multi-stage movable bin, the dimensions can be easily changed even when the groove dimensions change due to variations in the elastic deformation of the metal material.

As a result, there is no gap between the ball and the fixed pin, elastic deformation of the metal material, abrasion of the ball surface, etc., which degrades the groove transfer accuracy as in the past, improving groove transfer accuracy and reducing minute dimensions. Control is possible, and productivity and cost improvements can be achieved.

EXAMPLE Hereinafter, a method and apparatus for manufacturing a grooved hydrodynamic bearing according to an example of the present invention will be explained based on the accompanying drawings. 1st
The figure shows the arrangement of tools in the groove machining state of the method and apparatus for manufacturing a hydrodynamic bearing in the first embodiment of the present invention. In FIG. 1, 1 is a tool shaft, 2 is a multi-stage movable pin, 3 is a ball, 4 is a metal material, and 5 is an elastic deformation ring. By rotating the multi-stage movable pin, it moves back and forth in the axial direction by the action of a screw, and the diameter of the contact surface with the ball 3 can be varied. Moreover, the ball 3 fits into a hole in the circumferential direction of the tool shaft 10, and an elastically deformable ring 6 attached to the outer periphery of the tool shaft 1 allows the multi-stage movable pin 2 to always be attached to the multi-stage movable pin 2 even when the diameter of the multi-stage movable pin 2 changes. It is brought into close contact with the outer circumferential surface of and is fixed.

The operation of the method and apparatus for manufacturing the grooved hydrodynamic bearing constructed as described above will be explained below with reference to FIG. 2.

FIG. 2 shows the tool arrangement after dimension adjustment in the first embodiment. By rotating the multi-stage movable pin 2 fitted with a screw to the tool shaft 1, When the ball contact portion moves along the axial direction, the diameter of the ball contact portion of the multistage movable bin 20 changes, and the two balls 3a
, 3b expands and contracts. At this time, ball 3
3a and 3b, an elastic deformation ring 6 attached to the tool shaft 1 constantly applies a pressing force to the ball contact portion of the multi-stage movable pin 20, fixing the balls 3a and 3b and maintaining their dimensional accuracy. When the tool set in this manner is inserted into the inner diameter of the metal material 4, the balls 3a and 3b are always pressed against the multi-stage movable pin 2 side by the reaction force of the transfer processing force, so that the balls 3a and 3b are relative length 6
Transfer processing can be performed with high precision without any change.

As described above, according to this embodiment, the ball 3a.

By using an integral movable pin with different diameters to maintain the relative length 6 of the balls 3b and by providing an elastically deformable ring 5 to hold down the balls 3a and 3b, it is possible to reduce tool dimensional accuracy.
It is possible to prevent deterioration of transfer accuracy due to elastic deformation of metal materials, abrasion of the ball surface, etc., and improve productivity through minute dimensional control.

It is possible to improve costs.

Effects of the Invention As described above, the present invention provides a cylindrical multi-stage movable bottle that fits in the hollow part with a tool shaft having a hollow part at the tip and has a diameter that is larger than the fitting part, and a tool shaft tip. By providing a ball that fits into a predetermined hole on the nearby circumference, a multi-stage movable pin, and an elastically deformable ring that fixes the ball, there is a reduction in tool dimensional accuracy, and the elasticity of the metal material. It is possible to prevent deterioration of transfer accuracy due to deformation, wear of the ball surface, etc., and allows minute dimensional control.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a method and apparatus for manufacturing a grooved fluid bearing according to the first embodiment of the present invention, Fig. 2 is a block diagram after dimension adjustment of Fig. 1, and Fig. 3 is a diagram of a conventional grooved fluid bearing FIG. 1 is a configuration diagram of a bearing manufacturing method and apparatus. 1...Tool axis, 2...Multi-stage movable bin,
3...-ball, 5...elastic deformation/g, 6...groove. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] In order to form the groove of a grooved hydrodynamic bearing, it has an outer diameter that fits into the bearing hole of the workpiece, and a hollow part is provided at the tip. A tool shaft with a hole, a cylindrical multi-stage movable pin that fits into the hollow part of this tool shaft, and has a diameter that is larger than the fitting part, and a multi-stage movable pin that fits into a predetermined hole of the tool shaft and is movable in multiple stages. A ball that contacts the multi-step surface of the pin and presses against the inner circumferential surface of the bearing hole of the workpiece to form a groove, and an elastically deformable ring that brings the ball into close contact with the multi-step movable pin and fixes the ball. , a manufacturing device for a grooved fluid bearing, characterized in that grooves are formed by transfer processing of the balls.