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1.无模拉伸成形的工艺特点 常规的拉拔过程是通过模具约束金属变形,给金属施加变形力,得到预期规格的产品。但金属与模具之间的摩擦将增加拉拔力,能量消耗大,导致模具损坏,生产成本增加,摩擦还会影响制品的表面质量,又要消耗大量润滑材料。拉拔变形抗力高、塑性差的金属时,每道次的拉拔变形量小,需要多次拉拔,因而生产效率低。为提高难变形金属的道次变形量,常采用热拉拔工艺。金属和模具之间更易产生强烈的摩擦,严重时两者可产生热焊合,损坏模具,降低制品质量。 近十几年来,出现了一种新的金属成形工艺——无模拉伸成形。该工艺不用模具,只需对金
1. No-mold stretch forming process characteristics Conventional drawing process is constrained by the metal deformation of the metal, the deformation force applied to the metal to obtain the desired specifications of the product. However, the friction between the metal and the mold will increase the pulling force, energy consumption, resulting in mold damage, increased production costs, friction will affect the surface quality of products, but also consume a lot of lubricating materials. Drawing high deformation resistance, poor plasticity of the metal, each drawing a small deformation, the need for multiple drawing, and thus low production efficiency. In order to improve the deformation of difficult deformation metal pass, often using hot drawing process. Metal and mold more prone to strong friction, severe heat welding can produce both, damage to the mold, reducing product quality. In recent ten years, a new metal forming process has emerged - dieless stretch forming. The process without mold, just gold