为减少镀锌钢丝在拉拔过程表面锌层面质量损失,以1.3 mm 70钢中镀锌钢丝拉拔至0.85 mm为例,设计4种不同工作锥角度和定径带高度的方案,并对100组产品的锌层面质量进行统计分析。结果表明:工作锥角度为10°、12°、14°...为减少镀锌钢丝在拉拔过程表面锌层面质量损失,以1.3 mm 70钢中镀锌钢丝拉拔至0.85 mm为例,设计4种不同工作锥角度和定径带高度的方案,并对100组产品的锌层面质量进行统计分析。结果表明:工作锥角度为10°、12°、14°比8°时拉拔后锌层面质量分别提高26%、53%、21%。工作锥角度为12°时,锌层面质量损失最小。通过适当增加拉丝模工作锥角度,可有效减少镀锌钢丝拉拔后锌层面质量的损失。展开更多
The value of a drawing die＇s cone angle has great influence on wire drawing. In order to determine the optimum value of a drawing die＇ s cone angle, the plastic deformation power Wi, shear deformation power Wi and f...The value of a drawing die＇s cone angle has great influence on wire drawing. In order to determine the optimum value of a drawing die＇ s cone angle, the plastic deformation power Wi, shear deformation power Wi and friction power of contact surface Wf were calculated using the upper bound theory with a reasonable and movement permitted velocity field according to the related characteristics. Then the relation between half cone angle and unit drawing force was obtained and it was compared with the result with the spherical velocity field. The relative error of the two near the optimal value is only about 0. 26% through comparing with existing calculated results. Finally, in an ABAQUS environment the finite element modal of the wire rod with 12. 5 mm diameter in first drawing pass was established and the axial drawing force in different cone angles was obtained using the ABAQUS/Explicit explicit integration method. The finite element method （FEM） results verify the results using the upper bound theory and this indicated that the velocity field and the relation between half cone angle and unit drawing force reasonable.展开更多
密封钢丝绳生产的关键是Z形钢丝的生产,整体模拉拔Z形钢丝的关键是各道次拉丝模的孔型设计,应保证腰部两侧最大压下量处的模具工作锥半角不大于6°。采用12.5 mm 82B盘条经2道次圆形模和7道次异型模拉拔,选择70%~77%的总压缩率,...密封钢丝绳生产的关键是Z形钢丝的生产,整体模拉拔Z形钢丝的关键是各道次拉丝模的孔型设计,应保证腰部两侧最大压下量处的模具工作锥半角不大于6°。采用12.5 mm 82B盘条经2道次圆形模和7道次异型模拉拔,选择70%~77%的总压缩率,以及适当的道次压缩率,成功生产了1 770 MPa级Z6光面钢丝和1 670 MPa级Z6镀锌钢丝。提出Z形钢丝生产中应注意的问题,并对整体模与辊模拉拔进行对比,指出整体模拉拔更适合小批量生产。展开更多
文摘为减少镀锌钢丝在拉拔过程表面锌层面质量损失,以1.3 mm 70钢中镀锌钢丝拉拔至0.85 mm为例,设计4种不同工作锥角度和定径带高度的方案,并对100组产品的锌层面质量进行统计分析。结果表明:工作锥角度为10°、12°、14°比8°时拉拔后锌层面质量分别提高26%、53%、21%。工作锥角度为12°时,锌层面质量损失最小。通过适当增加拉丝模工作锥角度,可有效减少镀锌钢丝拉拔后锌层面质量的损失。
基金supported by Foundation of Guizhou Science and Technology Department under Grant No.[2008]2210 and No.[2009]3009Foundation of Guizhou University under Grant No. [2007]25
文摘The value of a drawing die＇s cone angle has great influence on wire drawing. In order to determine the optimum value of a drawing die＇ s cone angle, the plastic deformation power Wi, shear deformation power Wi and friction power of contact surface Wf were calculated using the upper bound theory with a reasonable and movement permitted velocity field according to the related characteristics. Then the relation between half cone angle and unit drawing force was obtained and it was compared with the result with the spherical velocity field. The relative error of the two near the optimal value is only about 0. 26% through comparing with existing calculated results. Finally, in an ABAQUS environment the finite element modal of the wire rod with 12. 5 mm diameter in first drawing pass was established and the axial drawing force in different cone angles was obtained using the ABAQUS/Explicit explicit integration method. The finite element method （FEM） results verify the results using the upper bound theory and this indicated that the velocity field and the relation between half cone angle and unit drawing force reasonable.
