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    冷拔鋼管的殘余應(yīng)力測試與結(jié)果分析

    Testing of Cold-drawn Steel Tube Residual Stress and Result Analysis

    • 摘要: 分析盲孔法測量冷拔鋼管表面殘余應(yīng)力的測試結(jié)果，得出冷拔鋼管各工序表面殘余應(yīng)力的分布規(guī)律，并將理論分析結(jié)果與測試結(jié)果進行對比；根據(jù)應(yīng)力分布測試結(jié)果，優(yōu)化冷拔加工工藝；提出消除冷拔鋼管有害殘余應(yīng)力的方法與措施。分析認為：等徑冷拔工藝生產(chǎn)的冷拔鋼管，其表面殘余應(yīng)力很小，均為壓應(yīng)力，材料的綜合性能良好；兩道次冷拔中間增加一次退火，對消除成品表面殘余應(yīng)力沒有明顯效果；總變形量不變的情況下，增大第一道次冷拔變形量，減小第二道次冷拔變形量，可得到表面殘余應(yīng)力更小的冷拔鋼管。

       

      Abstract: Analyzed is the result from testing of the cold-drawn steel tube residual stress with the hole-drilling technique.As a result, the regularities of residual stress distribution on the surface of the tube at each individual operation step of the cold-drawing process are identified.Then the result from relevant theoretic analysis is compared with that from the said testing.Based on the result from the testing of the stress distribution, the cold drawing process is optimized.And relevant method and measures for eliminating tube hazardous residual stress of the cold-drawn steel tube are proposed.It is revealed via related analysis that the steel tube as made with the equal-diameter cold-drawing process has little surface residual stress that is in any case compressive stress, and presents excellent over-all properties;adding an annealing process between two cold-drawing passes produces little effect on eliminating surface residual stress of the finished tube;and given that the total deformation is fixed, cold-drawn steel tubes with much lower surface residual stress will be produced by means of increasing the deformation of the first pass cold drawingoperation, and meanwhile reducing the deformation of the second pass cold-drawing operation.

       

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