A high-precision deep-hole grinding mandrel with a plastic grinding body

Abstract

The invention discloses a high-precision deep-hole grinding core rod of an adjustable plastic grinding body. The high-precision deep-hole grinding core rod of the adjustable plastic grinding body is composed of a tapered core rod body, an adjustment nut, an ejection gasket, the inner tapered plastic grinding body, an adjustment top nut and an inner hexagon screw. After the ejection gasket, the inner tapered plastic grinding body and the adjustment top nut are assembled into the tapered core rod body in sequence, the purposes of adjusting the inner tapered plastic grinding body to have an ideal outer diameter and detaching the inner tapered plastic grinding body are achieved by screwing and unscrewing the adjustment nut and the inner hexagon screw located at the two ends of the inner tapered plastic grinding body during grinding. The high-precision deep-hole grinding core rod of the adjustable plastic grinding body has the advantages that due to the fact that the grinding body is made of plastics with a high dilatation coefficient, size loss of the outer diameter of the grinding body produced in the grinding process can be compensated when the grinding body is expanded due to heat energy produced during grinding, and accordingly, a grinding clearance is guaranteed; due to the fact that the grinding body is made of plastics, damage to a grinding inner hole is avoided during grinding, and therefore it is guaranteed that the surface roughness of the grinding inner hole reaches a mirror surface with the Ra being 0.02-0.04 micrometer.

Description

technical field [0001] The invention relates to an inner-hole grinding mandrel for precise machining of parts in the field of mechanical manufacturing, in particular to a high-precision deep-hole grinding mandrel of an adjustable plastic grinding body whose grinding body is made of plastic and whose processing effect is a mirror surface . Background technique [0002] In the field of machinery manufacturing, especially in the field of aerospace precision machinery manufacturing, it is often necessary to grind the inner holes of some key parts to obtain extremely high shape and surface accuracy. The materials used for these parts are often stainless steel and titanium alloys that are not hard and difficult to grind. When grinding the inner hole by the traditional method, the grinding mandrel used is usually a solid cast iron grinding mandrel and a cast iron grinding mandrel with adjustable outer diameter. When the solid pig iron grinding mandrel is working, as the grinding ...

AI Technical Summary

Problems solved by technology

When the solid pig iron grinding mandrel is working, as the grinding continues, the outer diameter of the pig iron grinding mandrel will become smaller and the inner diameter of the inner hole to be ground will become larger, which will cause the enlargement of the grinding gap and affect the grinding accuracy. To obtain higher grinding precision, it is necessary to prepare multiple grinding mandrels. This method is inefficient and wastes resources; the outer diameter of pig iron grinding mandrels with adjustable outer diameter can be adjusted with the enlargement of the grinding gap. , but the cylindricity error of its grinding body is relatively large at the beginning of the adjustment. Although its cylindricity error will be improved after grinding, the grinding gap at that time will also increase accordingly, which is very important for obtaining high precision grinding. does not help

These two grinding mandrels also have the following defects, one: the pig iron mandrel will precipitate impurities inside its material during the grinding process and scratch the ground inner hole surface, and the other: the ground inner hole surface is especially The surface of the inner hole of the part made of stainless steel or titanium alloy is easily scratched by friction with the surface of the grinding mandrel

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