High precision cylinder helical compression spring squareness detecting method

Abstract

The invention relates to a detecting method of a high-accuracy cylindrical helical compression spring, specifically to a method for detecting the verticality of the high-accuracy cylindrical helical compression spring. The detecting method improves quality detection standards of the verticality of the compression spring to the utmost extent, so that the detected compression spring can satisfy the operating requirements of various application situations. The detecting method comprises following detecting steps: in the state without loading, the detected compression spring is horizontally arranged in the horizontal V-shaped groove of the spring placing frame, one end face of the spring reclines against a wide seating square, the spring is turned around one circle, and meanwhile a feeler gauge is used to detect the distance between the end face of the spring and the wide seating square, and then the maximum value is taken as the vertical deviation of the end face of the spring; the spring is overturned, the vertical deviation of another end face of the spring is measured in the same method, and a larger value between the two vertical deviations of the two end faces is taken as the vertical limit deviation of the compression spring. The detecting method is convenient and feasible. And the vertical deviation of the compression spring can accurate to within 0.10mm.

Description

Technical field [0001] The invention relates to a method for detecting a high-precision cylindrical spiral compression spring, in particular to a method for detecting the verticality of a high-precision cylindrical spiral compression spring. Background technique [0002] The existing detection method of cylindrical spiral compression spring is realized by high-precision flat plate, wide seat square, and feeler gauge. The specific measurement method is as follows: figure 1 , 2 As shown, in the no-load state, place the tested compression spring vertically on the flat plate and close it against the wide seat square, rotate the tested compression spring one circle, while rotating, measure the top circle of the tested compression spring with a feeler gauge The distance between the end and the wide seat square, take the larger value as the vertical deviation of the centerline of the compression spring relative to the bottom end of the compression spring; flip the compression spring un...

AI Technical Summary

Problems solved by technology

At present, the national standard GB1239.2-89 requires a wide range of parameters for the limit deviation of the verticality of the compression spring. Therefore, the verticality of some special high-precision compression springs can meet the requirements of the national standard through the existing detection methods, but in specific use , but does not meet the actual use requirements

For example: a high-precision compression spring used for flow or pressure adjustment, when used, has a sleeve on the outside, a piston inside, and a retaining ring on the end face. In order to meet the requirements of use, the straightness of the generatri The accuracy requirements of the parameters such as the perpendicularity of the surface relative to the axis are very high; taking the national standard GB1239.2-89 for the highest level 1 accuracy level of compression spring verticality as an example, that is, the verticality meets 0.02H 0 (1°08′25″), H 0 is the free height of the compressed spring): for H 0 = 10mm compression spring level 1 precision grade verticality limit deviation is 0.02×10 = 0.20mm; but for H 0 =46.7mm The limit deviation of the verticality of the first-grade precision grade of the compression spring is 0.93mm. It is obvious that the detection accuracy is too low. Although in actual production, the verticality deviation can reach 0.20-0.30mm, which fully meets the national standard, but the verticality deviation It is still large, which will cause friction between the compression spring and its internal piston and external sleeve, so the spring will still be stuck during use, causing large fluctuations in the adjustment of fuel flow or gas pressure, affecting the adjustment of flow or pressure. Can not meet the use requirements

Images