An instrument for measuring the shape and position tolerance of the outer contour of cylindrical parts

Abstract

The invention discloses a cylinder part outer contour geometric tolerance measuring instrument which comprises a positioning device, a first measuring device, a second measuring device and a base, wherein the positioning device comprises a positioning mandrel; a first outer circle surface is arranged on the upper section of the positioning mandrel, and a positioning end surface and a second outer circle surface are arranged on the lower section of the positioning mandrel; the bottom end of the positioning mandrel is a cylindrical section; indexing holes are formed in the positioning end surface uniformly; the first measuring device comprises a meter frame rod vertically fixed on the base and capable of moving forwards and backwards, and a plurality of lever dial gages; the lever dial gages are connected with the meter frame rod through first fixing adjusting structures; the second measuring device comprises a fixing rod vertically fixed on the base, an indexing device on the fixing rod and a multiple-degree-of-freedom meter frame adjusting device; the first measuring device and the second measuring device are respectively positioned on the two sides of the positioning device. The cylinder part outer contour geometric tolerance measuring instrument is simple in structure, accurate and reliable in measurement, convenient to operate, low in manufacturing cost, convenient to move, and flexile and changeable in positioning mode and can measure a plurality of beats at the same time.

Description

technical field [0001] The invention belongs to the field of measuring instruments, in particular to an instrument for measuring the shape and position tolerance of the outer contour of cylindrical parts, which is suitable for measuring the shape and position tolerance of the outer contour of cylindrical parts based on the inner hole, especially for missiles and rockets Components, involving synchronous real-time measurement of the runout of the outer circle and the runout of the end face of the step. Background technique [0002] The runout of the outer circle and the runout of the step end surface of cylindrical parts can reflect the coaxiality, cylindricity, roundness, flatness, verticality and runout of the product. [0003] In the prior art, there are two ways to measure the runout for rotary thin-walled cylindrical parts and components based on the inner hole. The first is real-time measurement during part processing, and the second is measurement with a runout measur...

AI Technical Summary

Problems solved by technology

[0005] First, multiple runouts cannot be measured simultaneously due to space constraints on the machine tool

[0006] Second, the clamping and positioning of the outer circle will cause deformation of cylindrical parts and components, and the measurement results will be inaccurate

[0007] Third, when the machining process of the part is completed, and then undergoes surface treatment, aging treatment, welding and other processes, the part will be deformed, and the data measured in real time on the machine tool will become invalid. This method of measurement is unreliable and cannot be used as the final measurement requirement.

[0008] The second measurement method, because the runout measuring instrument has no suitable positioning components, most of them are clamped and positioned by the top, and the measurement reference and design reference do not coincide, resulting in reference misalignment error and low measurement accuracy

In addition, the runout measuring instrument is complex in structure, high in cost, and inconvenient to move

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