Main features and technical requirements for stainless steel wire springs for springs. In addition to corrosion resistance, high strength and high fatigue life, spring stainless steel wire requires good high temperature relaxation and creep properties due to different applications. -196), magnetic and other aspects are also required, all of these performance characteristics are reflected in the standard.
For the arc height and chord length, the standard for stainless steel wire for spring analysis and classification and chemical composition. The stainless steel wire for spring is mainly composed of austenite and precipitation hardening type. The austenite is graded 302,304,316. Representative, the precipitation hardening type is represented by the 631J1 grade. In each standard, the chemical composition of the same steel grade is basically the same, and the allowable deviation of the melting component is also substantially the same. However, the new standard of ASTM A3132003 adds the grade XM28, 241, 204, and the new grade replaces Ni with Mn.
Japanese fine line enterprise standard specifies the stainless steel wire for NAS spring: when the wire size is 0.10.2mm, the dimensional deviation is (-0.0040)mm; when the specification is 0.40.8mm, the dimensional deviation is (-0.010)mm; the specification is 1.02. At 0mm, the dimensional deviation is (-0.0150) mm. For this reason, when the standard is revised, sufficient attention must be paid to meet the user's requirements. Mechanical properties Tensile strength China is divided into A, B, C3 grades; ISO is divided into normal strength springs for stainless steel wire standard comparison analysis (NS) and high strength (HS) level 2; Japan is divided into A, B, C, D4 grades. In the actual regulations, China's tensile strength is the smallest and the maximum is low, such as ordinary strength A grade: China 13241569MPa, Japan 14016650MPa, ISO not less than 1700MPa; high strength grade B: China 16761912MPa, Japan 16501900MPa, ISO not less than 1850MPa. It can be seen that the level of tensile strength specified by China is comparable to that of Japan and much lower than the international standard ISO (HS).
Suggestions for the revision of the standard for stainless steel wire for spring in China (1) YB(T) 1183 is the industry standard issued by the former Ministry of Metallurgy in 1983. It is far from being suitable for the requirements of technological advancement of enterprises, nor can it meet the requirements of users for product quality. The relevant departments should revise the standards as soon as possible. At the same time, the revised standards should be upgraded to national standards. (2) When formulating the standard for stainless steel wire for spring, the new grade of Cr-Ni-Mn-N alloy series should be appropriately added on the basis of YB(T) 1183 standard; the tolerance of the dimension should be increased, and the accuracy level should be improved according to GB342. To h10 or h9; special attention is given to negative deviation and positive deviation; mechanical properties such as tensile strength should be appropriately increased. (3) Process performance should be increased by inspection items such as bending, winding, winding test and linearity test.
It can be seen that the X and R values ​​of the 26 samples are within the control limits, and there is no non-random phenomenon in the arrangement of the dots. It can be considered that the process is in a controlled state, indicating that the three factors affecting the ellipticity are analyzed. The six quality control measures taken were effective. Process Capability Index To better examine the process's control capabilities, calculate the CP (Process Capability Index) and CPK (Correction Process Capability Index) values ​​for the ellipticity control process. The control standard of ellipticity is 00.06mm, the standard deviation is 0.012mm, the average value is 0.035mm, and CP=0.06/(60.012)=0.83; CPk=(0.06-0.035)/(30.012)=0.70. by CP, CPk The level corresponding to the value, the qualification rate of ellipticity is controlled above 95%, but the process control ability is not sufficient, and further comprehensive measures are needed to strengthen the process control.
Conclusions (1) In the process of hot-dip galvanizing of steel wire, the height and size of the gravel in the wiping test box, the pressure roller in the zinc pot and the responsibility of the operator are the main factors affecting the ellipticity of the hot-dip galvanized steel wire. (2) After the implementation of the process optimization measures, the qualification rate of the ellipticity of the hot-dip galvanized steel wire can be controlled above 95%. (3) Using XR control chart and process capability index analysis, it can effectively provide continuous improvement basis for large production.
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