Explosive segmental detonation cracking method at the root of the surface annular groove during pipe blanking

Abstract

A segmented explosive detonation and crack initiation method used on the root portion of a surface annular groove during tube blanking includes the steps that the annular V groove is formed in the outer surface of a long tube according to the blanking length, a cavity is filled with a long detonation cylinder with the diameter same as the annular V groove, a grain is enabled to correspond to the root portion of the annular V groove in a segment-to-segment mode, a first flange end socket and a second flange end socket are clamped to the two ends of the long tube and are tightly tensioned in the axial direction through first bolts, a high-pressure sphere gap switch is triggered by a laser device to be switched on during crack initiation, large pulse current is applied to a copper wire coaxial with the grain, the grain is detonated segment by segment to generate transient high-energy high-pressure shock waves, the inner wall of the long tube is loaded segment by segment, the root portion of the annular V groove is made to plastically deform due to stress concentration, and micro crack groups are generated. According to the method, non-coupling spaced loading is adopted, explosive quantity is effectively reduced, and the method has the advantages of shortening the blanking period, improving blanking efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of pipe blanking, and in particular relates to a method for explosive detonation initiation and cracking at the root of an annular groove on the surface during pipe blanking. Background technique [0002] The blanking of metal pipes widely exists in the preparation process of conveyor chain roller sleeves, inner (outer) rings of rolling bearings, sliding bearing bushes, etc. The quantity of blanking is huge, and the quality of the blanking directly affects the manufacturing accuracy and production of parts. efficiency and economic cost. Traditional pipe blanking mainly adopts cutting, stamping processing or thermal cutting, etc., which often have problems such as high energy consumption, low processing efficiency, poor section quality, or pipe wall collapse and pipe deformation. In recent years, precision blanking technologies such as prefabricated gaps using stress concentration effects and high-frequency ...

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Problems solved by technology

Traditional pipe blanking mainly adopts cutting, stamping processing or thermal cutting, etc., which often have problems such as high energy consumption, low processing efficiency, poor section quality, or pipe wall collapse and pipe deformation.

In recent years, precision blanking technologies such as prefabricated gaps using stress concentration effects and high-frequency low-stress circumferential swaging blanking have made pipe blanking develop in the direction of green manufacturing with low energy consumption, high quality, high productivity, and low pollution. The material time is long, which cannot meet the requirements of mass production

There are no reports on the combination of explosive detonation and pipe cutting

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