Projection welding method for piston rod and connecting ring of automobile shock absorber

Abstract

The invention discloses a projection welding method of an automobile shock absorber piston rod and a connecting ring. The method comprises the following steps that A, a dustproof cover is fixed to the upper end of the piston rod; B, the connecting ring is fixed to a positioning electrode; C, then the piston rod is conveyed to the welding station and fixed; D, the outer circumferential wall of the dustproof cover is clamped through at least two clamping electrodes, and the positioning electrode is pushed to move downwards till the lower portion of the connecting ring makes contact with the upper end of the piston rod; and E, a welding loop is formed after the connecting ring makes contact with the upper end of the piston rod so that welding between the piston rod and the connecting ring can be carried out. The mode that a clamping electrode directly acts on the outer circle surface of the piston rod in an existing projection welding technique is omitted, that is, the working surface of the piston rod is completely prevented from directly making contact with a projection welding electrode, thus, no clamping conductive area can be formed on the piston rod, and the piston rod is protected against pinching, slight ignition, severe burns and the like.

Description

technical field [0001] The invention relates to a car rear shock absorber, in particular to a projection welding method for a piston rod and a connecting ring of the automobile shock absorber. Background technique [0002] The telescopic shock damper is mainly used to suppress the shock when the spring rebounds after absorbing the shock and the impact from the road. When passing through uneven roads, although the shock-absorbing spring can filter the vibration of the road surface, the spring itself will reciprocate, and the shock absorber is used to suppress this spring jumping. The shock absorber on the car usually adopts a cylinder type hydraulic shock absorber, which is mainly composed of an oil seal, a dust cover, a piston rod, a piston valve, a bottom valve, a working cylinder, an oil storage cylinder, and an upper and lower connecting ring. When the valve ends move relative to each other, the hydraulic oil passes through a certain channel to generate throttling, and t...

AI Technical Summary

Problems solved by technology

[0004] However, since the thin neck of the piston rod 9 is in clearance fit with the inner hole of the dustproof cover 6, under the premise of adopting the projection welding method, the clamping electrode 7 needs to conduct electricity by clamping the piston rod 9 to complete the projection welding process. This increases the possibility of the piston rod 9 being pinched, and when the clamping surface of the clamping electrode 7 adheres to metal or impurities, the piston rod 9 is more prone to serious burns or slight sparks and other quality defects , the quality defects on the surface of this type of piston rod will easily cause the lip of the oil seal of the shock absorber to be scratched and damaged during the use of the shock absorber, and the sealing effect will fail prematurely and oil leakage will cause the shock absorber to fail

Relevant R&D personnel try to ensure the manufacturing accuracy of projection welding electrodes, the selection of electrode materials, the cleanliness of piston rods before welding, and the effective and regular maintenance or replacement of electrodes during use under the premise of original technology and equipment. Make a fuss about other aspects, solidify into a standard process and control it. Although there are obvious effects, there are always potential quality problems in the piston rod after projection welding, which cannot fundamentally ensure the expected service life of the shock absorber.

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