共查询到19条相似文献,搜索用时 62 毫秒
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本文用数学分析方法分析了单叶回转双曲面矫直辊型的形成原理,并推导出母线与z轴空间夹角α的计算公式。在此基础上,得出一新的辊型加工方法。该法操作简单,生产效率高,辊型精度高,且提高钢盘矫直质量。 相似文献
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从钢管压力矫直工艺的弹性变形、塑性变形情况下的力学条件研究入手,提供了设备选型和矫直操作的力学参数计算方法。对压力矫直机进出料辅助辊道结构设计给出了一个简易实用的示例。 相似文献
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根据普通碳素钢的反弯矫直计算方法,对高速钢棒材的反弯矫直压下量进行了修正,并通过矫直实验进行了验证。 相似文献
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以辊形曲线方程为理论依据利用简化高次方程法计算出理论矫直辊的辊径,使之与实测得到的实际辊径相比较,得出二者的差别,并分析了理论和实际辊形曲线之间的误差对矫直效果的影响,提出了对实际矫直工艺的调整措施。 相似文献
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《钢铁研究学报(英文版)》2016,(8):745-755
Cross-sectional ovalization of thin-walled circular steel tube because of large plastic bending,also known as the Brazier effect,usually occurs during the initial stage of tube′s continuous rotary straightening process.The amount of ovalization,defined as maximal cross section flattening,is an important technical parameter in tube′s straightening process to control tube′s bending deformation and prevent buckling.However,for the lack of special analytical model,the maximal section flattening was determined in accordance with the specified charts developed by experienced operators on the basis of experimental data;thus,it was inevitable that the localized buckling might occur during some actual straightening operations.New normal strain component formulas were derived based on the thin shell theory.Then,strain energy of thin-walled tube(per unit length)was obtained using the elastic-plastic theory.A rational model for predicting the maximal section flattening of the thin-walled circular steel tube under its straightening process was presented by the principle of minimum potential energy.The new model was validated by experiments and numerical simulations.The results show that the new model agrees well with the experiments and the numerical simulations with error of less than 10%.This new model was expected to find its potential application in thin-walled steel tube straightening machine design. 相似文献
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针对钢筋矫直功率消耗大的缺点,提出了一种新型的模块矫直原理--转毂钢球式模块矫直.即在模块体内镶嵌3个可以任意方向转动的钢球,变传统矫直中钢筋与模体之间的滑动摩擦为钢筋与钢球间的滚动摩擦.其优点为:送、拉料和矫直功率大大下降,矫直质量明显提高,尤其是矫直带肋钢筋,无肉眼可见划痕,矫直后的钢筋不直度每米小于1 mm,且产品质量稳定.对矫直力能参数进行了分析计算,可为设计矫直机提供参考. 相似文献
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以国内某厂65Mn矩形坯为研究对象,建立了矩形坯的传热和热弹塑性模型,模拟矩形坯凝固过程的温度场,以及在进行单点矫直时矫直点处的应力场分布情况;分析温度场及热应力的分布对铸坯质量的影响,为优化连铸工艺提高矩形坯的质量提供了理论依据。模拟结果表明:采用普碳钢工艺浇铸65Mn钢时,在矫直点还存在大量液芯,高拉速下铸坯处于带液芯矫直,较全凝固矫直而言,其应力云图出现了不规则分布,且应力梯度增大,大大增加了内裂的产生几率。通过对工艺优化前后的铸坯低倍进行对比分析发现,本研究所提出优化工艺方向合理,铸坯质量大幅提高,取得较好的实践效果。 相似文献
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The multi-roller straightening process of section steel is analyzed by the springback theory of small curva- ture plane bending. The theoretical analysis results prove the curvature unification in straightening process and clear- ly reveal the principle of the multi-roller straightening process. The principle can be described as~ the initial curva- tures are reduced by several times anti-bendingl meanwhile the initial curvature differences are diminished and the residual curvatures are unified~ finally, the member after curvature unification is straightened by the last anti-ben- ding. With the plastic region ratios becoming larger, the initial curvatures are more easily unified in straightening process. Based on the plastic region ratios and the required number of roller systems for unifying the initial curva- tures, the large deformation straightening strategy and the small deformation straightening strategy are redefined. The new definition provides an important theoretical basis for setting reliable reduction rules. Through the theoretical analysis results, a new straightener design philosophy is proposed to improve the straightening quality and further increase the adjustment precision as well as the flexibility of the last roller system. The adjustable end roller emerges as the times required, achieving a good effect in practical application. 相似文献
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热成型钢及热成型技术 总被引:2,自引:0,他引:2
对热成型钢的成分设计、热成型工艺过程以及表面氧化的处理进行了论述。热成型工艺可以通过直接热成型或者间接热成型实现;热成型钢都是含硼钢,硼能抑制成型过程中铁素体形核;通过锰、铬和钼等提高淬透性防止珠光体形成;一般热成型钢中含有0.2%左右的碳。热成型钢可通过喷丸的方法消除表面氧化层或者镀层技术保护其表面不受氧化。 相似文献