Piston welding device and method

Abstract

The invention discloses a piston welding device and method. The device comprises a workbench, a first linear guide rail and a second linear guide rail. The workbench is provided with a fixing part matched with a lower end spigot of a piston and can drive the piston to rotate around the central axis of the piston. The first linear guide rail is located above the piston and is parallel to the long axis of the piston, a first welding gun used for welding a top seam is arranged on the first linear guide rail, and the first welding gun can move along the first linear guide rail. The second linear guide rail is parallel to the central axis and is located on the side face of the piston. The second linear guide rail is provided with a second welding gun used for welding a circular seam, and the second welding gun can move along the second linear guide rail. During actual use, the positions of the first welding gun and the second welding gun on the first linear guide rail and the second linear guide rail are adjusted respectively, then the top seam and the circular seam can be welded by rotating the workbench, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of piston welding, and more specifically, to a piston welding device and method. Background technique [0002] At present, the explosion pressure of domestically developed diesel engines for vehicles has exceeded 20MPa, making it difficult for traditional cast aluminum pistons to meet the reliability requirements of high-performance diesel engines. Therefore, all-steel pistons have been popularized in China. It is forged and connected by welding to form a closed cooling oil chamber. [0003] As far as the existing technology is concerned, piston welding methods include: laser welding, friction welding, and electron beam welding; among them, electron beam is widely used because of its advantages such as large aspect ratio, vacuum welding, high welding strength, and less pore defects. There are two commonly used electron beam welding piston methods, method one: preheating before welding → circular seam (top s...

AI Technical Summary

Problems solved by technology

[0004] Among them, method 1 requires two preheating, two heat preservation, two clamping pistons, and two vacuum pumping during welding, which requires a lot of repetitive work time and is not efficient; and repeated preheating and heat preservation will affect the substrate Performance

Method 2 The piston is clamped once, although the efficiency has been improved, but in order to avoid the local temperature of the piston from being too high, usually after welding one seam, it is necessary to wait for a period of time before welding another seam, which increases the total welding time and reduces production efficiency

In addition, the above two solutions can only weld a weld in a fixed direction. The direction and position of the welding torch cannot be adjusted freely. Generally, the ring seam can only be welded in the horizontal direction, and the top seam can only be welded in the vertical direction. The degree of flexibility is low. Unsatisfactory effect

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