Grinding head spindle assembly for ball grinder with hollow cooling and flushing structure

Abstract

The invention discloses a grinding head spindle assembly provided with a hollow cooling and washing structure of a ball grinding machine. The grinding head spindle assembly comprises a grinding disc 1, a bearing I3, a bearing II 6, a sleeve 4, a spindle 5 and a belt pulley 7, wherein the spindle 5 is arranged in the middle of the sleeve through the bearing I3 and the bearing II6, the belt pulley 7 and the grinding disc 1 are fixed at two ends of the spindle 5 respectively, an axial through hole 9 is arranged at the center of the spindle 5, the rear end of the spindle 5 is connected with a rotary connector 8, the front end of the spindle 5 is connected with a liquid spraying and pressing plate 2, the liquid spraying and pressing plate 2 is fixed at the center of the cavity of the grinding disc, a liquid inlet of the liquid spraying and pressing plate 2 is communicated with the front end of the axial through hole 9, and the cavity of the rotary connector 8 is communicated with the rear end of the axial through hole 9. The grinding head spindle assembly disclosed by the invention overcomes the deficiencies of poor heat stability of the spindle and single cooling liquid feeding method, improves the precision and stability of the machine, and is mainly applicable to grinding machines used for grinding symmetrical balls in the ball valve industry.

Description

technical field [0001] The invention belongs to the technical field of spherical grinding machines, and in particular relates to a grinding head spindle assembly of a spherical grinding machine with a hollow cooling and flushing structure. Background technique [0002] The accuracy of the sphericity and surface roughness of the sphere processed by the existing sphere grinding machine cannot meet the design requirements. Tracing it to its cause, there are two main disadvantages. One is that the thermal stability of the main shaft part is poor, and the precision error of the grinding sphere is large. The thermal stability of spindle components includes temperature stability and precision stability. The existing main shaft structure only simply lubricates the bearings, but does not take corresponding measures for the thermal deformation of the main shaft parts caused by the heat generated by other transmission parts, resulting in a short service life of the main shaft bearings...

AI Technical Summary

Problems solved by technology

The existing main shaft structure only simply lubricates the bearings, but does not take corresponding measures for the thermal deformation of the main shaft parts caused by the heat generated by other transmission parts, resulting in a short service life of the main shaft bearings and a high failure rate

Second, the coolant supply mode is single, the flushing effect is not obvious, and the surface quality of the grinding ball is poor

The existing liquid supply method is to spray from the outside to the grinding area, but because the peripheral speed of the grinding disc used for ball grinding is relatively high, a thin layer of air around the surface also rotates at a high speed with the grinding disc, forming a stream. The high-speed airflow prevents the coolant from entering the grinding area, and the effect of cooling and flushing cannot actually be achieved, resulting in poor surface quality of the grinding ball

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