Knurling machine

Abstract

The invention relates to a knurling machine, which is applied to crankshaft journal fillet rolling of an automobile air compressor. The knurling machine comprises a box-type platform base, a headstock, a tailstock, a portal structure and a knurling mechanism, wherein the box-type platform base, the headstock, the tailstock, the portal structure and the knurling mechanism are arranged on the base; the knurling mechanism comprises more than one knurling unit; the knurling unit is assembled on the beam of the portal structure by a lifting mechanism and is hung between the headstock and the tailstock; and each knurling unit comprises a shearing-structure rolling arm, a rolling oil cylinder, a roller and a supporting roller, wherein the rolling oil cylinder, the roller and the supporting roller are assembled on the rolling arm. After the machine tool is knurled, a deep-groove fillet is not provided with a crease, a crack and a scratch, the journal jump of the main shaft is detected to less than or equal to 0.15mm by two apexes, and a fatigue strength index after knurling is improved by above 80% on the basis of a crankshaft body.

Description

Technical field [0001] The invention relates to a rolling machine tool, in particular to a rolling machine tool for rolling the crankshaft journal of an automobile air compressor with a deep groove fillet. Background technique [0002] In automobiles, air compressors are mainly used for braking, and its safe and efficient operation is one of the important prerequisites for safe operation of automobiles. The crankshaft is an important part of the air compressor that bears impact load and transmits power. In each working stroke of the air compressor, there is a large alternating load acting on the crankshaft through the piston and connecting rod assembly, making it bear repeated Shock. Because the crankshaft is under the action of alternating stress, the risk of stress fatigue and strain fatigue failure at the transition fillet of the journal section change is extremely high. [0003] How to improve the fatigue strength of the crankshaft to increase the safe service life of the air...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned problems that the crankshaft of the existing automobile air compressor adopts general rolling equipment, the strength of the crankshaft cannot be further improved and the yield rate is low, the present invention proposes a rolling method applied to the round corner rolling of the crankshaft journal of the automobile air compressor. The machine tool can effectively roll the fillet of the crankshaft journal of the air compressor to improve the strength of the crankshaft of the air compressor and increase the yield

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