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伸臂缸筒是汽车起重机液压元件的关键零件，缸筒长度４．４～８ｍ，长径比达５０～６０，尺寸精度一般为ＩＴ８，表面粗糙度Ｒａ≤０．４μｍ。我厂原用热轧厚壁钢管作为缸筒坯料，采用粗镗—浮镗—滚压的组合拉镗工艺。生产率为０．６～１ｍ／ｈ，材料利用率为６０％～７０％
The boom cylinder is a key component of the hydraulic components of truck crane. The cylinder length is 4.4 ~ 8m and the aspect ratio is 50 ~ 60. The dimension accuracy is generally IT8 and the surface roughness Ra≤0.4μm. Our factory originally used hot-rolled thick-walled steel tube as a cylinder blank, the use of rough boring - floating boring - combination of rolling Boring process. The productivity is 0.6 ~ 1m / h, the material utilization rate is 60% ~ 70%