DQ-0772宝优妮惠心衣帽架 Y型主体设计，拥有外观专利与实用新型专利结构设计，缩口管连接，让顶部挂衣钩方向可以自由调节；
DQ-0772 Bonunion Huixin Coat Hat Rack Y-shaped body design, appearance patent and one structure patent for utility model, connected by necking pipe which makes top hook direction adjustable.
分析了火焰管缩口的变形特点。
The deformation characteristic of the flame pipe necking was analyzed.
对于缩口系数小、变形前后壁厚比较大的薄壁管件的缩口成形，一般需多道工序来完成。
The shrink shape for thin tube with little shrink rate and bigger thickness difference in the distortion generally demands more working procedures.
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