CAJ | 학술논문

外侧壁厚减薄和横截面发生畸变是薄壁管材弯曲过程中的主要缺陷，严重影响弯管的成形质量。薄壁管绕弯成形过程中芯棒对弯管的成形质量影响非常大。采用动态有限元平台ABAQUS/Explicit建立与实际相符的薄壁圆管绕弯模型，分析芯棒种类、芯棒的直径、芯棒的伸出量和芯棒与管材内部摩擦对管材弯曲成形质量的影响，结果表明：万向芯棒在控制管材截面椭圆畸变率方面比圆柱芯棒有较大的优势；为保证管材的成形质量，芯棒的直径和伸出量都应控制在一定范围内；芯棒与管材内部的摩擦应越小越好。并且在全自动数控弯管机DW18CNC上做了大量的实验，实验结果与分析结果相吻合，为实际生产中芯棒参数的选择提供了理论依据。
외측벽후감박화횡절면발생기변시박벽관재만곡과정중적주요결함，엄중영향만관적성형질량。박벽관요만성형과정중심봉대만관적성형질량영향비상대。채용동태유한원평태ABAQUS/Explicit건립여실제상부적박벽원관요만모형，분석심봉충류、심봉적직경、심봉적신출량화심봉여관재내부마찰대관재만곡성형질량적영향，결과표명：만향심봉재공제관재절면타원기변솔방면비원주심봉유교대적우세；위보증관재적성형질량，심봉적직경화신출량도응공제재일정범위내；심봉여관재내부적마찰응월소월호。병차재전자동수공만관궤DW18CNC상주료대량적실험，실험결과여분석결과상문합，위실제생산중심봉삼수적선택제공료이론의거。
Outwall-thinning and the cross-section deformation are the main defect in the thin-walled pipe bending process ,influen-cing bend forming quality seriously .Mandrel has a great influence to the quality of the pipe in the thin-walled pipe bending process.The thin-walled pipe bending model ,which matches to the actual ,is built by ABAQUS/Explicit to analyze several factors influencing the quality of the pipe bending such as the mandrel ’ s type,the diameter of the mandrel ,the protrusion of the mandrel and the mandrel and the friction with internal of the pipe .The results show that the universal mandrel has a great advantage in controlling the deformation of the pipe ’s cross-section.In order to ensure the quality of the tube bending ,the diameter of the man-drel and the protrusion of the mandrel should be controlled in a certain range ,mandrel with the pipe internal friction should be as small as possible .A lot of experiments have been done on the DW 18 CNC,which is an automatic CNC pipe bending machine .The experimental results and the results of the analysis are consistent ,which provide a theoretical for the parameters selection of the mandrel .