A Constant Pressure Difference Intermittent Rotating Extrusion Abrasive Flow Polishing Device

Abstract

The invention relates to an efficient constant pressure difference intermittent rotating extrusion abrasive flow polishing device and belongs to the technical field of intermittent rotating extrusion abrasive flow automatic polishing of large-size complicated curved parts with higher uniformity requirements on surface quality. The abrasive flow polishing device is a rotating grinding and polishing device where a hydraulic motor drives a gear and is engaged with a negative clearance turntable bearing; sealing rings are mounted on junction surfaces to achieve static sealing of a high-pressure abrasive; dynamic sealing of the high-pressure abrasive is achieved by mounting quick-wear sealing rings at rotating friction parts for sealing and mounting special combined high-pressure abrasive sealing ring and high-pressure abrasive seals in places where pistons extrude the abrasive; and finally, intermittent rotation grinding and polishing of the high-pressure abrasive is achieved. The device solves the problems of excessive grinding and rounding in the traditional abrasive flow extrusion, and achieves aerodynamic performances and efficient precise uniform polishing of complicated curved surfaces such as impellers and blades with the higher surface uniformity requirements. The device can reduce surface roughness Ra of various complicated parts to below 0.8.

Description

technical field [0001] The invention relates to a constant pressure difference intermittent rotary extrusion abrasive flow polishing device, which belongs to the technical field of automatic polishing of intermittent rotary extrusion abrasive flow for large-scale complex curved surface parts requiring high uniformity in surface quality. Background technique [0002] Mechanical products with complex curved surfaces, such as aero-engine blisks, impellers, blades, thin-walled parts, pump valve bodies and elongated holes, need to be processed by ultra-finishing after grinding, milling, EDM or other special processing To achieve uniform, low roughness and smooth surface processing requirements on the surface of the workpiece to be processed. At present, enterprises mainly use whetstone or manual polishing process, while the traditional extrusion abrasive flow technology will produce "rounding" and "over-polishing", which greatly affects the uniformity of the product surface. Thi...

AI Technical Summary

Problems solved by technology

At present, enterprises mainly use whetstone or manual polishing process, while the traditional extrusion abrasive flow technology will produce "rounding" and "over-polishing", which greatly affects the uniformity of the product surface

This is mainly due to: (1) due to interference, complex trajectory, etc., rigid polishing tools such as grinding wheel heads or abrasive belts have low efficiency and high cost, and it is difficult to achieve efficient polishing of complex curved surfaces; (2) traditional "bore pass" When polishing complex curved surfaces with rotary extrusion abrasive flow and rotating parts, due to the existence of the pressure difference between the inlet and outlet, it is easy for the processed workpiece to remove more material when the pressure is high, and remove material when the pressure is lower. (3) The "suction" rotary abrasive flow processing controlled by the pump valve as the power source, compared with the hydraulic system as the extrusion abrasive flow processing method of the feeding transmission system, although due to its own pressure Low and there is no pressure difference in the process of fluid abrasive polishing, but the pressure it provides is small, the viscosity of the abrasive is low, and the abrasive grains are loose. When the grinding and polishing process reaches a certain stage, the processing effect is not obvious

[0003] The extrusion abrasive flow process is an efficient polishing method for complex curved surfaces such as the inner surface of the mold, small holes, and valve cavities. However, the traditional extrusion abrasive flow process used in enterprises is mainly used in air conditioners with low aerodynamic performance requirements. Impellers, hydraulic valve chambers, slender holes, etc. have little effect on parts that are "rounded" and "over-thrown"; and aeroengine impellers, blades, and high-physical-performance screws that require high aerodynamic performance. Surface uniformity requires consistent complex curved surfaces. Due to the unequal pressure difference between the inlet and outlet of the traditional extrusion abrasive flow during the abrasive extrusion process of the workpiece, an uneven pressure field is formed in the sealed cavity flowing through the processed workpiece, thus It is very easy to cause surface unevenness such as "over-throwing" and "rounding" on the surface of the processed workpiece at the inflow and outflow of abrasive extrusion, and rely on pump valve suction type loose low-viscosity rotating abrasive flow polishing to provide pressure Small, low viscosity abrasive grains, ideal for ultra-fine polishing, but not suitable for rough polishing, semi-fine polishing and fine polishing

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