Self-tapping method for machine screw and self-tapping pre-manufactured hole of machine screw

A technology of prefabricating holes and screws, which can be used in motor vehicles, parts of lighting devices, road vehicles, etc., can solve problems such as inability to penetrate

Active Publication Date: 2016-12-14
HASCO VISION TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, under some specific conditions, it is necessary to directly tap the original machine screw into the prefabricated hole without thread. If the prefabricated hole is designed in the same way as the original self-tapping screw, it must not be tapped.

Method used

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  • Self-tapping method for machine screw and self-tapping pre-manufactured hole of machine screw
  • Self-tapping method for machine screw and self-tapping pre-manufactured hole of machine screw
  • Self-tapping method for machine screw and self-tapping pre-manufactured hole of machine screw

Examples

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Effect test

Embodiment 1

[0047] A self-tapping method for a machine screw, comprising: preset a prefabricated hole before the machine screw is tapped, and the prefabricated hole is a prefabricated hole with an inwardly convex "four petals" structure formed around the inner wall of a hole.

[0048] A prefabricated hole with a convex "four petals" structure is formed around the inner wall of the prefabricated hole mold. The prefabricated hole mold is a slider core-pulling directly outside.

[0049] Radius of the transition hole / radius of the prefabricated hole>1.1, the transition hole is the outermost hole at the top of the prefabricated hole, and the radius of the prefabricated hole is the outer radius of the screw thread. The ratio of the four-lobed orthographic projection area of ​​the inwardly convex "four lobes" formed around the inner wall of the prefabricated hole / the orthographic projection area of ​​the machine screw is between 0.4-0.5.

[0050] In addition, the inwardly convex "four petals" s...

Embodiment 2

[0052] Except for the following differences, others are the same as in embodiment 1, implementing the self-tapping of the mechanism screw:

[0053] The inward convex "four petals" structures formed around the inner wall of the prefabricated hole are symmetrically distributed at intervals of 90°, and the inwardly convex "four petals" structures formed around the inner wall of the prefabricated hole are asymptotically convex inward.

[0054] The ratio of the four-lobed orthographic projection area of ​​the inwardly convex "four lobes" formed around the inner wall of the prefabricated hole / the orthographic projection area of ​​the machine screw is 0.6.

[0055] According to the mechanism screw self-tapping method of the present invention, the screw teeth can be prevented from slipping by reducing the resistance of the mechanism screw while ensuring the meshing quantity of the screw teeth.

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Abstract

The invention provides a self-tapping method of a machine screw. The method includes the step that a pre-manufactured hole is pre-formed before tapping of the machine screw, and is characterized in that a four-section structure is formed in the periphery of the hole inner wall of the pre-manufactured hole, thus, the quantity of tooth engagement can be guaranteed while tapping resistance of the machine screw is reduced, and tooth screw looseness is avoided.

Description

technical field [0001] The invention relates to the field of vehicle lamps, in particular to a self-tapping method of a mechanism screw and a self-tapping prefabricated hole. Background technique [0002] According to the classification of threads: screws can generally be divided into machine screws and self-tapping screws. Coarse teeth are generally used for machine-made screws, which need to be matched with corresponding standard internal threads, as shown in Figure 1. [0003] The threads of self-tapping screws are divided into coarse teeth and fine teeth, generally called type A and type AB (type A and type AB), most of which are AB teeth. Self-tapping screws do not need to cooperate with internal threads, only prefabricated holes are required, and matching threads are automatically generated when tapping, which is called thread for min. As shown in Figure 2. [0004] However, under some specific conditions, it is necessary to directly tap the original machine screw in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V17/12F21W101/02F21W107/10
CPCF21V17/12
Inventor 沈海军孙良柱严彬华柳源
Owner HASCO VISION TECHNOLOGY CO LTD
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