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die design
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  die design
Also, the UBET-based preform design tool is presented as a process and die design tool for multistage forging processes.
      
The material constants of semisolid material in the stress-strain curve are proposed to perform the numerical analysis for a die design of semisolid forging.
      
This article presents a proof-of-concept illustrating the potential utility of layer-based extrusion dies for the die design and fabrication process.
      
Extrusion die design and development often requires significant craftsman skill and iterative improvement to arrive at a production-ready die geometry.
      
Precise selection of die velocity, process temperature, and die design is necessary to produce satisfactory products.
      
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This paper reports“watermelon skin”phenomenon and its forming con-ditions and points out the limitations of the Ostwald formula while it isapplied to die design.It is considered that the observed“watermelon skin”phennomenon is caused by the Buras effect of the melt when it leaves fromthe die.The deformation of molten polymer coil is a function of shear stress,time,viscosity and pressure.The transfer of normal stress difference is dis-persive and absorptive,and conforms to the feature of viscoelastic...

This paper reports“watermelon skin”phenomenon and its forming con-ditions and points out the limitations of the Ostwald formula while it isapplied to die design.It is considered that the observed“watermelon skin”phennomenon is caused by the Buras effect of the melt when it leaves fromthe die.The deformation of molten polymer coil is a function of shear stress,time,viscosity and pressure.The transfer of normal stress difference is dis-persive and absorptive,and conforms to the feature of viscoelastic normaltress wave transferring.The mathemetical model and theory of stress waveare used to explain the“watermelon skin”phenomenon and to design thedie.Basing on the viscoelasticity-structure change of polymer coils in the die,the change of normal stress difference is studied,It is found that the changesof die land length,viscocity and pressure are only related to the difference ofwall-thickness of“watermelon skin”,and the changes entrance angle ofdie and structure of filter plate are only related to the numbers of“water-melon skin”streaks.Author analyzed the causes of“watermelon skin”phenomenon rising in theconventional filter platetype,spreader type and large crosshead type blowmolding dies and provided measures for troubleshooting.In this paper,basing upon the melt slipping and viscosity coating theories,we analyzed the special mechanism of“watermelon skin”phenomenon occuredin crosshead type die and provided the corresponding measures for troubleshoot-ing.

本文阐述了“西瓜皮”现象及产生的条件,提出了 Ostwald 公式应用于机头设计时的局限性。认为宏观表现的“西瓜皮”症是熔体存在的法向应力差在其离模时被 Barus 效应所体现;高分子熔体线团的形变是剪应力、时间、粘度、压力的函数,其法向应力差的传递具有弥散及吸收现象,符合粘弹性法向应力波的传播特征;从而提出了用粘弹性法向应力波的数学模型和理论解释“西瓜皮”症及应用于机头设计的可能性。本文从高分子线团在机头内的粘弹性结构变化出发研究了法向应力差的变化,认为机头定型长度、粘度、压力的变化仅与“西瓜皮”壁厚差的程度有关,而机头入口角、过滤板的结构变化仅与“西瓜皮”条纹数有关。对常见的过滤板式、分流梭式、直角式大型吹塑机头产生“西瓜皮”症的原因进行了具体的理论分析并提出了的防治的措施。本文以熔体滑移和粘度包复理论分析了直角式吹塑机头产生“西瓜皮”症的特殊机理,提出了相应的防治措施。

The concept and procedure of the extruder die for the microwave continuousvulcanized rubber goods were systematically discussed and the die design particular forextrusion profiles was analysed.

系统讨论了微波连续硫化橡胶密封条生产线的橡胶制品专用挤出口型设计的基本构思和方法步骤,并具体分析了异形挤出制品的口型设计。

Introductions include die design,process and extruding technology for Φ250mm pre cision preforming machine and Φ150mm extruders to extrude fork type rubber profile containing asbestos.

介绍了用于Φ250mm精密预成型机和Φ15.mm挤出机挤出叉形含石棉橡胶型材的口型设计、加工与挤出工艺探索。

 
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