Selection method for determining test stress corresponding to test load during spring prestressing treatment

Abstract

The invention relates to a selection method for determining test stress corresponding to a test load during spring prestressing treatment. The selection method comprises the following steps: S1, selecting materials including selecting spring steel made of three materials, namely 60Si2MnA, 60Si2CrA and 60Si2CrVA; S2, calculating a test load including setting a test load as Fs and spring steel teststresses of different materials as tau s, and calculating according to a calculation formula (1) or a calculation formula (2), wherein the calculation formula (1) is calculated and determined according to 70% of the lower limit value of the tensile strength required by the design: tau s = 0.7 sigma b (1), or the calculation formula (2) is as follows: tau s is equal to 0.8 sigma s (2) according to80% of the yield strength required by the spring steel design; taking a larger value of results obtained in the calculation formula (1) and the calculation formula (2); calculating the test load according to a calculation formula (3); S3, carrying out prestressing treatment under the condition that the test stresses corresponding to the three materials of 60Si2MnA, 60Si2CrA and 60Si2CrVA are addedwith 5% of test load or the deformation of 3mm of the spring. Product reliability is improved.

Description

Technical field [0001] The invention relates to the technical field of determining the test stress of a hot-wound cylindrical helical compression spring, in particular to a method for determining the test stress corresponding to the test load when the spring is stressed. Background technique [0002] Under normal circumstances, the test stress given by the parameters and selected materials of the ideal pattern design should not exceed 680MPa~930MPa, and the hardness should be within the range of HRC45~HRC50. However, the engineering machinery springs involved at present are limited due to their structural size limitations and load characteristics. Hard requirements, usually designed springs are of small winding ratio, large deformation, high stress, so when checking the spring pattern, it can be found that the maximum working stress corresponding to the maximum working load of the spring all exceeds the test stress 680MPa~930MPa, and The spring test load is equal to or greater th...

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Problems solved by technology

[0002] Under normal circumstances, the test stress of the given parameters and selected materials of the ideal pattern design should not exceed 680MPa~930MPa, and the hardness is in the range of HRC45~HRC50. Rigid requirements, usually designed springs are of small winding ratio, large deformation, high stress, so when checking the spring pattern, it can be found that the maximum working stress corresponding to the maximum workin...

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