Machining method for female screw and device for same

Abstract

In the present invention, when a female screw is machined into a hole in a metal material with a hole for female screw machining, with the metal material in a held or secured state and the male-screw-shaped tool solely revolving in a fixed horizontal plane and not rotating, gradual pressure is applied to a machining section of the male-screw-shaped tool and the shape of the machining section is transferred to the inner circumference of the hole, thereby forming a screw groove therein. The present invention comprises a processing machine body for holding or securing the metal material with the hole for female screw machining, an X axis-Y axis table that is capable of controlled movement in an elliptical oscillation when exerting the necessary pressure on the processing machine body, and the male-screw-shaped tool fixed to the X axis-Y axis table. While gradual pressure is applied to the machining section of the male-screw-shaped tool, the shape of the machining section is transferred to the inner circumference of the hole and thereby forming the screw groove therein solely by the revolving motion of the male-screw-shaped tool fixed to the X axis-Y axis table in a fixed horizontal plane, without itself rotating.

Description

technical field [0001] The present invention relates to a method and an apparatus for forming an internal thread on a hole of a metal material having a hole for internal thread processing. Background technique [0002] It is well known that the internal thread constitutes one side of the thread as the most common fastening element. [0003] Conventionally, it is known to process internal threads by tapping. [0004] However, as far as the machining of internal threads with a large diameter is concerned, tapping is usually not used. [0005] The main method of machining a large-diameter internal thread is cutting machining with a single-edged tool (threading tool) (for example, refer to Patent Document 1). [0006] However, in cutting processing with a single-edged tool (threading tool), there are problems such as disposal of generated chips and damage to the edge of the tool due to generation of chips, but there is no alternative method. [0007] In addition, as this inte...

AI Technical Summary

Problems solved by technology

Therefore, the number of control movable parts increases, and as a result, it is impossible to design a high-strength and high-rigidity processing machine

[0009] In addition, since the rotation of the tool corresponding to the number of thread ridges is required (for example, refer to Patent Document 1), the processing time is limited.

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