Machining fixture of irregularly-shaped straight slot and machining method

Abstract

The invention relates to a machining fixture of an irregularly-shaped straight slot and a machining method. The machining method includes the steps that firstly a large part of allowances of the irregularly-shaped straight slot are removed by using a wire-cut machining method, and the machining allowance of the irregularly-shaped straight slot is reserved to be 0.01mm to 0.05 mm; parts of the irregularly-shaped straight slot are clamped on the fixture; once again the parts of the irregularly-shaped straight slot and the fixture are integrally mounted on an abrasive flow machine tool, the rest of the machining allowances of the irregularly-shaped straight slot are removed by using an abrasive flow machining mode; and finally the parts of the irregularly-shaped straight slot are dismounted from the fixture and the abrasive flow machine tool, the parts of the irregularly-shaped straight slot are inspected and put in storage after being washed. By using the technical scheme provided by the machining method, the machining method by combining fast wire cut with abrasive flow grinding machining together is used, firstly the large part of machining allowances are removed through fast wire cut , rough machining and forming are conducted, and then forming is completed through the abrasive medium grinding mode, so that the roughness of the surface around the irregularly-shaped straight slot is improved greatly, the machining cost is reduced, and the machining accuracy and the machining quality are improved.

Description

Technical field [0001] The invention relates to the technical field of mechanical processing, and in particular to a processing fixture and a processing method for a special-shaped through groove. Background technique [0002] At present, with the development of the manufacturing industry, many small parts with high machining accuracy requirements are widely used in the aerospace industry. Such parts often have some special uses, so some special shapes need to be designed and processed on such parts. Through grooves, when processing special-shaped through grooves on this type of parts, due to the design requirements for high machining accuracy, the surface roughness requirement is Ra1.6, which makes manufacturing and processing difficult. If conventional plunge milling, grinding, and milling are used Such machining methods are difficult to meet the requirements of machining accuracy. For example, when using a milling machining method, a special milling cutter is required for plun...

AI Technical Summary

Problems solved by technology

[0002] At present, with the development of the manufacturing industry, many small parts that require high machining accuracy are widely used in the aerospace industry. These parts often have certain special uses, so it is necessary to design and process some special-shaped parts on these parts When processing special-shaped through grooves on such parts, due to the design requirements of high machining accuracy, the surface roughness requirement is Ra1.6, resulting in difficulties in manufacturing and processing. If conventional plunge milling, grinding, milling It is difficult to meet the requirements of processing accuracy by other processing methods. For example, when using milling processing method, it is necessary to use a special milling cutter to insert and mill perpendicular to the direction of the special-shaped through groove. Deformation, resulting in low machining accuracy and position accuracy of the through groove, the surface roughness of the through groove does not meet the design requirements, during the processing, the loss of the milling cutter tool is very large, the cost of the special forming milling cutter is high, and some special forming milling cutters The knife cannot be put into the practical application stage, and cannot meet the needs of large-scale industrial production; in the prior art, if the fast-feeding wire cutting or medium-feeding wire cutting technology is used to process such special-shaped slots, the surface roughness around the slots is about Ra2 .0, if the wet sand blowing treatment method is used again, due to the large change in the size of the polished parts of the wet sand blowing machine, it will cause a large deformation on the surface of the through groove of the part, which will cause a large taper on the end surface of the through groove, making the processing The accuracy is difficult to guarantee, and the polishing time required to polish parts with a wet sand blasting machine is very long, which affects the processing efficiency of the parts, resulting in a high scrap rate and high production costs

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