Cr-Ni輕型氣瓶旋壓收口金屬脫落原因分析

Investigation of Causes for Metal Shedding during Neck-sp inning of Cr-Ni Light Gas Cylinder

摘要: 利用金相顯微鏡、掃描電鏡及能譜分析等手段，分析了Cr-Ni氣瓶用無縫鋼管在中頻感應(yīng)加熱旋壓收口過程中產(chǎn)生金屬脫落缺陷的原因。結(jié)果表明：金屬脫落是由于鋼管過燒所致。制瓶廠家在收口過程中，采用中頻感應(yīng)加熱及三軸聯(lián)動旋壓收口時加熱溫度過高、形變速度過大，機械能轉(zhuǎn)化為熱能致使局部溫度上升至液相點以上，導(dǎo)致形變過燒。

Abstract: Causes for metal shedding as a defect occurring during medium frequency induction heating & neck spinning process of the Cr-Ni light gas cylinder are analyzed by means of metallographic microscope，scanning electron microscope and energy spectrum analysis etc.As a result，it is revealed that it is over burning of the tube that leads to metal shedding thereof.Since the manufacturer normally employs medium frequency induction heating and 3-shaft-linkage spinning processes for neck-spinning of the gas cylinder，over-high temperature，and over-high deformation velocity that gets mechanical energy transform into thermal energy so as to get the temperature of some areas of the work piece rising up above the liquid phase point，and thus eventually cause the deformation over-burning of the metal.