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我厂生产的200升油桶口螺塞,外螺纹规格是TM60×2,旋合扭力≤98.06Nm。该螺塞的毛坯是带凸缘的薄壁圆筒形拉伸件,材料为10号冷轧薄钢板,厚1.5mm,延伸率大于25％,塑性较好。螺塞上TM60×2螺纹可采用冷滚压法成形。目前国内通用的Z28系列滚丝机采用的是圆柱两面滚压法成形外螺纹,但坯件必须是实心件或厚壁件。如是薄壁空心坯件,无芯部材料支承,在滚丝轮作用下,坯件将失稳。根据上述分析,我们在确定工艺方案时,采用了滚丝轮一个在坯件外,一个套在坯件内的单面旋转滚压螺纹方法,见图。
I plant the production of 200 liters barrel mouth plug, male thread size is TM60 × 2, screw torque ≤ 98.06Nm. The screw plug blank is a flanged thin-walled cylindrical tensile member, the material is No. 10 cold-rolled steel sheet, thickness 1.5mm, elongation greater than 25%, good plasticity. Screw on the TM60 × 2 thread can be cold roll forming method. At present, the common domestic Z28 series thread rolling machine adopts the cylindrical two-sided rolling method to form the external thread, but the blank must be a solid piece or a thick-walled piece. In the case of thin-walled hollow blank, coreless material support, under the action of roller, the blank will be unstable. Based on the above analysis, we determine the process scheme, the use of a rolling wheel outside the blank, a blank set in the blank rotary screw thread method, see figure.