Machining and assembling process of large thin-wall shaft sleeve

Abstract

The invention discloses a machining and assembling process of a large thin-wall shaft sleeve. The machining and assembling process comprises the steps that the outer diameter phi1 of an original journal is subjected to journal outer diameter machining to phi2; sections are evenly distributed and machined on the peripheral side of the journal in the axial direction; the shaft sleeve is machined; the outer diameter of the shaft sleeve is phi3, the inner diameter of the shaft sleeve is phi4, and quenching and tempering treatment is carried out after machining; the machined shaft sleeve and the journal machined in the second step are assembled; and the matched shaft sleeve is machined, the shaft sleeve with the outer diameter being phi3 is machined till the outer diameter is phi1, and machining and assembling on the shaft sleeve are completed. According to the machining and assembling process, the abrasion loss of the shaft end is cut off, the position of the cut-off quantity is sleeved with the shaft sleeve through an interference hot assembly process, and the shaft sleeve is machined again, so that the outer diameter of the shaft sleeve is consistent with that of the journal, and assembling and machining on the shaft sleeve are completed; a plane is cut out on the cut face of the journal, and the fixed structure of the shaft sleeve is improved during assembly; and the shaft sleeve assembling and machining manner for repairing the shaft end is good in structural stability.

Description

technical field [0001] The invention belongs to the technical field of mechanical parts processing, and in particular relates to a processing and assembling process method for a large thin-walled shaft sleeve used for repairing the wear and tear of the crankshaft rear oil seal journal. Background technique [0002] The processing and use of shaft sleeves are very common in the machinery industry, forming its unique technical standards. According to the recommended national standard (GB / T 3162-1991), during the design and processing of the bushing, when the outer diameter exceeds 130mm, the minimum wall thickness is 3mm. However, even if we process the shaft sleeve according to this standard, when it is assembled with the corresponding shaft (with a certain amount of interference), the shaft sleeve is still easily deformed, and it is difficult to meet the assembly accuracy requirements. [0003] Generally speaking, for crankshafts with journal diameters below 80mm and roundn...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a processing and assembling process for a large thin-walled shaft sleeve. By cutting off the amount of wear on the shaft end, a shaft sleeve is placed on the position of the cut amount through an interference thermal assembly process, and the shaft sleeve is again installed. Processing is carried out so that the outer diameter of the shaft sleeve is consistent with the outer diameter of the shaft diameter, that is, the assembly and processing of the shaft sleeve is completed, and the problem that the existing large-diameter journal cannot be repaired after wear is solved

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