中国机械工程 ›› 2012, Vol. 23 ›› Issue (20): 2476-2480.

• 机械基础工程 • 上一篇    下一篇

给定预紧力下组合机架的上限载荷计算

金淼1;董晓传1;邹宗园1;孙建新2   

  1. 1.燕山大学先进锻压成形技术与科学教育部重点实验室,秦皇岛,066004
    2.山东通裕集团有限公司,德州,251200
  • 出版日期:2012-10-25 发布日期:2012-11-01
  • 基金资助:
    国家自然科学基金资助项目(50975248);国家科技重大专项(2010ZX04017-013) 
    National Natural Science Foundation of China(No. 50975248);
    National Science and Technology Major Project (No. 2010ZX04017-013)

Calculation of  Upper Iimit Load for Assembled Frame Hydraulic Press under Given Pre-tightened Force

Jin Miao1;Dong Xiaochuan1;Zou Zongyuan1;Sun Jianxin2   

  1. 1.Key Laboratory of Advanced Forging & Stamping Technology and Science,Ministry of Education,Yanshan University,Qinhuangdao,Hebei,066004
    2.Shandong Tongyu Group Co., Ltd.,Dezhou,Shandong,251200
  • Online:2012-10-25 Published:2012-11-01
  • Supported by:
     
    National Natural Science Foundation of China(No. 50975248);
    National Science and Technology Major Project (No. 2010ZX04017-013)

摘要:

针对传统预紧组合结构机架预紧力计算模型的不足,以承载下立柱上端内侧角点处的压应力等于零为临界开缝判据,在给定预紧力下,建立综合考虑弯曲和拉压变形的液压机上限载荷的计算模型,结合平衡和变形协调条件,推导出了典型预紧组合结构液压机承受中心载荷时上限载荷的计算公式,并以某厂的120MN大型自由锻造液压机本体为原型,设计并制备了1∶15的金属模型压机,利用该模型压机对所提出的计算模型进行了实验验证。实验结果表明,该计算模型是准确可靠的,较传统理论的计算精度有大幅提高。

关键词: 液压机, 组合结构, 整体性, 上限载荷, 预紧力

Abstract:

Aiming at the defects of traditional calculation model of the pre-tightened assembled structure,a critical criterion was proposed that the stress of inside corner at the top of upright column was equal to zero.Then a calculation model considering bending,tension and compression deformation was established under the given pre-tightened force.Combining with the force balance and deformation coordination conditions,
the formula of upper limit load was derived,when the typical pre-tightened assembled structure hydraulic press was under the center load.Taking a 120MN heavy free forging hydraulic press as the prototype,
a metal model press  by the ratio of 1∶15 was made to verify the proposed model.The experimental results demonstrate that the model established  herein is accurate and reliable,there is a substantial increase in the accuracy than that by the traditional one.

Key words: hydraulic press, assembled structure, integration property, upper limit load, pre-tightened force

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