Eccentric fixture for machining of crankshaft crank pin journal

Abstract

The invention discloses an eccentric fixture for machining of a crankshaft crank pin journal. A basic disk B can slide in a dovetail groove of a basic disk A. The upper portion of the basic disk B is in threaded connection with an eccentric distance adjusting bolt. The eccentric distance adjusting bolt is in shaft connection with a check block fixed to the basic disk A and is axially positioned through a boss. An upper eccentric distance measuring block is arranged on the basic disk B. A lower eccentric distance measuring block 25 is arranged on the basic disk A. A fixture body is fixed to the basic disk B. A positioning pad is fixed into the fixture body. A pressing plate is arranged at the upper end of the positioning pad. The positioning pad and the pressing plate clamp a crankshaft and are fastened through swing bolts. A plug pin seat is mounted on the side face of the fixture body through a positioning hole and fixed to the side face of the fixture body through screws. A plug pin is arranged in the plug pin seat. The front end of the plug pin is matched with a groove of an index plate. The index plate is fixed to a main journal of the crankshaft. The eccentric fixture for machining of the crankshaft crank pin journal has the advantages that the adjustment time of the crank pin eccentric fixture is shortened, the manufacturing cost of the fixture is lowered, and operation is convenient.

Description

technical field [0001] The invention relates to the mechanical field, in particular to a clamp. Background technique [0002] When the surface of the crankpin journal of the crankshaft is processed by a turning (grinding) machine, the main shaft at both ends of the crankshaft is clamped by a pair of eccentric clamping devices respectively installed on the main shaft head of the headstock of the turning (grinding) bed and on the head of the tail box. Neck, relying on the eccentric distance dimensional accuracy manufactured by the eccentric fixture device itself to make the center line of the crankpin journal concentric with the main shaft of the turning (grinding) machine, and then cutting. [0003] The existing fixtures are complicated to operate, time-consuming and labor-intensive, and are greatly influenced by human factors. Frequent disassembly and assembly are easy to damage the spindle of the machine tool, and the versatility is not good. The cost of manufacturing fixtu...

AI Technical Summary

Problems solved by technology

[0003] The existing fixtures are complicated to operate, time-consuming and labor-intensive, and are greatly influenced by human factors. Frequent disassembly and assembly are easy to damage the spindle of the machine tool, and the versatility is not good, and the cost of manufacturing fixtures is high. The above-mentioned adjustment process is repeated every time the product is replaced, and the production efficiency is low.

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