铝合金挤压管内表面纵向直条擦伤缺陷研究

Study of Long Strait Banded Inwall Defect in Aluminium Alloy Pipe Extrusion

铝合金管材挤压时在其内表面上产生纵向直条状擦伤，所造成的废品占擦伤废品的６０％以上．分析了纵向直条状擦伤的产生规律和分布特点，研究了其产生的机制及影响因素，提出了减少擦伤的措施．

The long strait banded. inwall defect of extruded aluminium alloy pipes is one of the most serious defect. The waste from this kind of defect holds more than 60%. Through the analysis of its cause and distributing feature, its principle and effect factors are studied. Some methods of decreasing the defects are presented.