Machining method for inner and outer arcs and tooth profile of large chain wheel

Abstract

The invention relates to the field of machining, in particular to a machining method for inner and outer arcs and a tooth profile of a large chain wheel. The machining method comprises the following steps: a blank is cast; lines are drawn; the thickness is roughly planed; two end surfaces of a workpiece are bored; the enlarged dimensions of an inner hole and an outer circle are calculated according to allowances preserved on the two end surfaces; the inner hole and the outer circle are roughly turned with a vertical lathe; tempering treatment is performed; the thickness is semi-finely planed and finely planed to a pattern dimension; the two end surfaces of the workpiece are bored with a boring mill; the workpiece is assembled into a whole circle; the outer circle is semi-finely turned on the vertical lathe, and arcs are turned; the outer circle of the large chain wheel is leaned against three round rod fixtures on a numerical control milling machine, and the outer circular arc surface is positioned by utilizing the fixtures; the inner hole of a first section of large chain wheel is machined according to a method of finding a chord length midpoint and determining a coordinate zero point; and for a subsequent large chain wheel, only the outer circle surface and an end surface are leaned against the fixture round rods, and the inner hole and the other end surface are machined. The machining process of the machining method is simple; the machining quality and machining precision of the workpiece can be ensured; the production cost is lowered; and the production efficiency and product qualification rate are improved.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a processing method for inner and outer arcs and tooth profiles of a large sprocket. Background technique [0002] The bucket wheel mechanism is a very critical part in the sintering machine equipment, and the large sprocket is an important part of the bucket wheel mechanism. The processing of the large sprocket directly affects the assembly accuracy and production cycle of the bucket wheel mechanism. Because of its large diameter, it is difficult to process in consideration of the economy of processing, adjustment during assembly, and deformation during use. The current processing method has the following disadvantages (1) The outer circle and inner hole are not processed after quenching and tempering. Semi-finishing, where there is no precise positioning datum, the CNC milling machine needs to find the midpoint of the chord length for coordinate positioning before processi...

AI Technical Summary

Problems solved by technology

Because of its large diameter, it is difficult to process in consideration of the economy of processing, adjustment during assembly, and deformation during use. The current processing method has the following disadvantages (1) The outer circle and inner hole are not processed after quenching and tempering. Semi-finishing, where there is no precise positioning datum, the CNC milling machine needs to find the midpoint of the chord length for coordinate positioning before processing, which is inefficient, and because of the quenched and tempered workpiece, the internal The margin of the hole and the outer circle is relatively large, all of which are processed on the CNC milling machine, which takes a long time and virtually increases the processing cost

(2) The arc shape is processed after the tooth shape processing is completed. At this time, it is intermittent turning, and the tool is easily damaged, which reduces the processing efficiency and increases the processing cost.