Method for measuring diameter of ring groove

Abstract

The invention relates to a method for measuring the diameter of a ring groove, which comprises an installing method and a detecting method. The measuring method comprises the following steps: placing the lower surface of the body of a vernier caliper on the top surface of a sizing block positioned on a flat plate, and making two outside tips vertically hang at two sides of the sizing block; fitting the bottom surface of the lower flanges of the measuring tips sleeved on the tips with the flat plate, and tightly screwing fastening bolts; when detecting, inserting the flanges of the two measuring tips from two sides of a measured ring groove until the flanges touch the bottom of the groove; finding the maximum value D2 generated when the shaft axis of the two measuring tips and the shaft axis of the measured ring groove are in the same plane; comparing the reading D2 with the standard value D1 of a block gage which is previously measured; and then, judging whether the measured value is within the tolerance limit or not. Each measuring tip comprises a column shaft provided with an axial through groove, and a coaxial thin disc-shaped flange positioned at the bottom end of the column shaft. The invention can accurately and conveniently detect the diameters of inner ring grooves and outer ring grooves of different sizes to meet the detection requirements of various workpieces.

Description

technical field [0001] The invention relates to a measuring method, in particular to a measuring method for detecting the diameters of inner and outer ring grooves. Background technique [0002] At present, there is no convenient and accurate measurement method for the outer ring groove processed on the outer cylindrical surface and the inner ring groove in the inner hole. For example, the piston ring is one of the key parts of the internal combustion engine. There are oil ring grooves and gas ring grooves on its outer surface to install the oil ring and gas ring. The oil ring groove and gas ring groove are collectively called the piston ring groove. The piston ring groove needs To control and detect the depth of the ring groove, in order to facilitate measurement, in actual processing, it is to control and detect the cylindrical diameter of the bottom surface of the piston ring groove, that is, the bottom diameter of the ring groove. At present, in production and batch tes...

AI Technical Summary

Problems solved by technology

However, the thickness of the block gauge generally does not match the width of the ring groove to be tested. There is a large gap between the upper and lower surfaces of the block gauge and the side wall of the ring groove, so the upper and lower surfaces of the block gauge are not easy to be parallel to the upper and lower side walls of the ring groove. It is easy to tilt in the groove to cause inaccurate measurement; and the two gauges must be parallel to each other in the length direction and tangent to the cylindrical surface of the bottom of the ring groove. cause inaccurate measurement

In addition, because only the narrow side of the block gauge is used as the measuring surface, the two sides are easily worn. This uneven wear forms grooves on the block gauge, which not only makes the size measurement inaccurate, but also causes damage to the block gauge.

For the inner ring groove in some cylinders, it is also necessary to detect the diameter of the ring groove, and the processor generally relies on the indirect guarantee of the machine tool scale feed, which brings great inconvenience to the processor

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