Method of processing impeller on five-axis machining center

Abstract

The invention provides a method of processing impellers on a five-axis machining center and relates to the field of machining, and particularly relates to the method of processing the impellers on the five-axis machining center. The method comprises following steps: (1) clamping positioning with a mandrel: processing a key groove on a workblank for assistant positioning and performing the clamping positioning being suitable for the mandrel; and (2) alignment of a workpiece with a dial indicator: calculating the coordinate system of the workpiece, installing a mounting rod of the dial indicator on a cutter handle and moving a workbench to move the central line of a main shaft approximately to the center of the workpiece. By mean of the method, clamping times can be reduced and positioning precision is ensured, and meanwhile the surface roughness of the impellers can be increased. By means of high-speed milling, the cutting force and the cutting zone temperature are effectively reduced, thereby reducing thermo-deformation of the impellers. The method can not only increase processing efficiency but also increasing processing quality and precision, and can enhance the strength and the rigidity of the impellers.

Description

technical field [0001] The invention relates to the field of machining, in particular to a method for machining an impeller on a five-axis machining center. Background technique [0002] The impeller is a key component of water pumps, steam turbines, water turbines, propellers and other devices. The impeller profile is composed of complex three-dimensional free-form surfaces, which requires high geometric precision and is technically difficult. The front semi-open impeller is a more commonly used impeller form, mainly used to transport liquids containing suspended solids such as solid particles and fibers. It has a certain sealing effect and is widely used in refining and chemical centrifugal pumps. [0003] The traditional impeller processing method is to use different blanks for the blades and the hub, and weld the blades to the hub after processing and forming respectively. It is easy to be damaged at the welding place, and due to the thermal stress generated by welding,...

AI Technical Summary

Problems solved by technology

It is easy to be damaged at the welding place, and due to the thermal stress generated by welding, it will cause deformation, easy to produce false welding, and the welding shrinkage is difficult to control accurately, which will lead to the change of the geometric dimension of the impeller flow channel formed by the previous machining, resulting in the accuracy error of the flow channel and affecting the overall performance. The mechanical characteristics and service life of the machine will not only consume man-hours, but also reduce efficiency and affect product quality.