1) Machining prefabrication
加工预制
2) manufacturing and precasting at working site
现场加工预制
3) pre-hole
预加工孔
1.
Then a conclusion is drawn: The compound deformation with bending and expanding happens in the process of hole flanging, and five cases of diameters of the workpiece's pre-holes and three cases of those types are adopted in the simulations, the diameter and type of the pre-holes optimized are respectively 40mm (average diameter) and reverse-conical.
研究表明,该翻孔成形具有弯曲与扩孔的复合变形特点,并通过对5种不同预加工孔径及3种不同孔型下翻孔过程的模拟分析,得出优化的孔径尺寸及孔型为平均直径40mm的反锥型孔。
2.
Influence of the workpiece s pre-hole diameters and passes on thick-wall cylinders hole flanging is investigated by experiment and numerical simulation.
采用实验研究和数值模拟的方法,分析了工件预加工孔径和孔型参数对厚壁筒体翻孔工艺的影响。
4) pre-manufacture
预加工
1.
According to the constant-volume principle of plastic forming and the mechanical characteristics of flanging deformation,the calculation of the diameter of the pre-manufactured hole for flanging is disˉcussed.
根据塑性变形体积不变原则和翻边变形的力学特点,探讨了翻孔预孔孔径的计算方法,分析了现有的按弯曲件展开原则计算翻孔预加工小孔孔径方法的欠妥之处,提出了一个更合理的计算公式。
5) Machining preview
加工预览
6) preparation
[英][,prepə'reɪʃn] [美]['prɛpə'reʃən]
预先加工
补充资料：加工
是指对货物进行再生产；受托加工货物，是指委托方提供原料及主要材料，受托方按照委托方的要求制造货物并收取加工费的业务。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条