Impeller pull rod machining method

Abstract

The invention belongs to the field of machining, and particularly relates to an impeller pull rod machining method. The impeller pull rod machining method is characterized by including: subjecting to a blank to thermal treating and tempering; roughly turning outer circles and end faces of a positioning end; roughly turning outer circles and end faces of a pressing end; performing ultrasonic flow detection; grinding the outer circles of each grade and positioning the two end faces of each outer circle; tapping an inner thread hole and a chamfer of the pressing end; finely turning outer threads at two ends; milling flat potential; bench workers deburring and inspecting the external threads especially at the position of the flat potential; performing surface penetrant inspection and comprehensive inspection. With the impeller pull rod machining method, coaxiality of the outer circle and thread as well as thread accuracy requirements on the external thread is guaranteed, and yield of impeller rods reaches up to 100%.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing method for an impeller pull rod. Background technique [0002] The existing processing method of the impeller tie rod generally includes the following steps: 1. Heat treatment and tempering of the blank; 2. Rough turning of each end face and outer circle; 3. Ultrasonic flaw detection; 4. Finish turning of each end face and outer circle; 5. Milling and flattening 6. Finish turning external thread and threaded blind hole, chamfering; 7. Fitter deburring; 8. Surface penetration inspection; 9. Comprehensive inspection. In the existing impeller tie rod processing method, according to the processing steps, the milling is first performed in step 5, and then the external thread is turned in step 6. Due to the intermittent cutting process, the tolerance of the external thread cannot meet the thread accuracy grade requirements of the drawing. In addi...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems of the poor precision of the external thread of the impeller tie rod and the poor coaxiality of the external threads at both ends in the prior art, the purpose of the present invention is to provide a processing method for the impeller tie rod. The process sequence of milling and flattening solves the technical problem of poor precision of the external thread of the impeller rod; by adding the grinding process, the technical problem of poor coaxiality of the external thread at both ends of the impeller rod is solved, and the product qualification rate is greatly improved.

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