回火装置 meaning in English

back fire arrangement
back-fire arrangement

Through analysis of the change of the specifications of the clothing wires made of alloy steel before or after the tempering process , the paper puts forth that installation of tempering device after the punching and quenching process is helpful to better quality of clothing wires , improving the color difference of clothing and prolong the service life of clothing
摘要通过分析合金钢针布齿条回火前后各项指标的变化，指出在冲淬工艺后加装回火装置有助于提高金属针布性能，改善针布齿条色差，延长其使用寿命。