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Method for welding piston by laser with laser heat treatment

A technology of laser heat treatment and laser welding, which is applied in the field of laser heat treatment, can solve problems such as delayed cracks and easy cracking of weld seams, and achieve the effects of controllable speed, simplified process, and improved weld seam forming quality

Inactive Publication Date: 2012-05-23
SIASUN ROBOT & AUTOMATION LIMITED BY SHARE
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the deficiencies of other welding piston methods and overcome the problems that the weld seam of the laser welding piston is easy to crack and the delayed cracks are easy to appear after welding, the present invention provides a method of laser welding piston with laser heat treatment

Method used

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  • Method for welding piston by laser with laser heat treatment

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Embodiment Construction

[0022] The invention controls the rotation of the positioner, the raising and lowering of the laser head or the output of the laser through the numerical control system of the numerical control machine tool. During laser preheating or post-heat treatment, the piston and the positioner remain relatively stationary, and the piston is driven by the positioner to rotate; the positioner can rotate clockwise and counterclockwise, and its control is integrated into the numerical control system, and its speed can be adjusted. control. The control of the laser is integrated in the numerical control system, and the light emission time and light output power can be adjusted in the numerical control system.

[0023] According to the present invention, it is actually applied to the laser welding heat treatment of 42CrMo piston ring sleeve and piston head. 42CrMo piston, its carbon content belongs to the range of medium carbon steel, and the laser welding of medium and high carbon steel is...

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Abstract

The invention relates to the technical field of laser heat treatment, in particular to a method for welding a piston by laser with laser heat treatment. A piston ring sleeve and a piston head in interference fit are preheated by laser; then, an annular welding line is welded and connected by the laser; and after welding is finished, the piston ring sleeve and the piston head are subjected to post-heat treatment. The method disclosed by the invention comprises the following steps of: firstly, cleaning the piston ring sleeve and the piston head in interference fit by acetone; then, fixing the piston ring sleeve and the piston head on the fixture of a positioner; preheating above a piston by a laser head arranged on a numerical control machine tool system; meanwhile, rotating the positioner, and welding by laser after the surface temperature of the piston reaches certain value; and carrying out postheat treatment by laser after welding is finished. According to the method, the problem that the welding line is cracked when the piston is welded by the laser is solved, the heat treatment technology is simplified, welding line forming stability is improved, and welding quality is easier to control.

Description

Technical field: [0001] The invention relates to the technical field of laser heat treatment, in particular to a method for laser welding a piston with laser heat treatment. Background technique: [0002] The production of pistons mainly includes integral forming methods and welding forming methods. The main welding methods for pistons formed by welding include laser welding, electron beam welding and friction stir welding. In the Chinese patent (publication number CN1610601A), a method of producing a piston with integral molding is disclosed. The piston embryo is produced by forging, and then a complete piston is produced by machining. Methods. In the manufacture of pistons formed by welding, a Chinese patent application (publication number CN101468426A) discloses a method for independently laser welding pistons, and a Chinese patent application (publication number CN1944994A) discloses a method for welding pistons by friction stir welding method. In US Pat. No. 4,553,01...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20B23K26/42B23K26/08C21D1/09B23K26/24B23K26/60
Inventor 石磊迟海龙罗勇张翼飞王智超
Owner SIASUN ROBOT & AUTOMATION LIMITED BY SHARE
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