Method for repairing crankshaft of automobile engine

Abstract

The invention belongs to the technical field of crankshaft repairing, in particular to a method for repairing a crankshaft of an automobile engine. An electron-brush plating repairing machine tool isemployed by the method; the electron-brush plating repairing machine tool comprises a worktable, a chuck, a tailstock, sliding mechanisms and an electron-brush plating device; each sliding mechanism comprises a lead screw, a guide pillar and a first sliding block; the lead screws and the guide pillars are parallel with the chuck in axis; each first sliding block is arranged on the corresponding lead screw and guide pillar; a curved plate is arranged between the two first sliding blocks; the inner ring of the curved plate and a revolving connecting rod neck are tangential intermittently; the inner ring of the curved plate is provided with the electron-brush plating device; and the electron-brush plating device comprises a brush ring, a second sliding block, a support plate and a gear. According to the method disclosed by the invention, by installing the brush ring, when rotating eccentrically, the connecting rod neck is clamped into the brush ring; along with rotation of the crankshaft,the second sliding block is pushed to slide along the curved plate; when the second sliding block slides, the brush ring is driven by the gear to rotate about the outer ring of the connecting rod neck to perform uniform brush plating on the outer ring of the connecting rod neck, thereby increasing the repairing efficiency of the crankshaft.

Description

technical field [0001] The invention belongs to the technical field of crankshaft repair, in particular to a method for repairing an automobile engine crankshaft. Background technique [0002] The crankshaft is the main rotating part of the engine. After the connecting rod is installed, it can undertake the up and down (reciprocating) motion of the connecting rod into a circular (rotating) motion. It is an important part of the engine. Its material is made of carbon structural steel or ductile iron. There are two important parts: main journal, connecting rod journal, (and others). The main journal is installed on the cylinder block, the connecting rod journal is connected with the large end hole of the connecting rod, and the small end hole of the connecting rod is connected with the cylinder piston, which is a typical slider crank mechanism. The lubrication of the crankshaft mainly refers to the lubrication of the big end bearing bush of the connecting rod and the cranksha...

AI Technical Summary

Problems solved by technology

[0003] The crankshaft is a precise and expensive important part that can withstand alternating loads and high mechanical strength. Once a certain part of the crankshaft is damaged, it will seriously affect the work of the whole machine

The damage of the connecting rod neck of the crankshaft is one of the common damages. At present, the commonly used remanufacturing and repair methods for the damage of the connecting rod neck of the crankshaft include electric brush plating, spraying, and electric welding surfacing. Among them, in the brush plating method, manual brushing is used. The efficiency of plating is low. At the same time, due to the eccentricity of the connecting rod neck relative to the central axis of the crankshaft, when it is clamped on the lathe for brush plating, the brush plating is uneven, which affects the repair efficiency of the connecting rod neck.

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