Assel機(jī)組生產(chǎn)高精度鉆具用管的控制難點(diǎn)及要點(diǎn)
Control Difficulties and Critical Points Concerning Manufacture of Hi-precision Drill-purpose Pipe with Assel Mill
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摘要: 介紹了厚壁鉆具用管對(duì)幾何尺寸精度的要求，結(jié)合Assel機(jī)組工藝特點(diǎn)，分析了其生產(chǎn)控制難點(diǎn)及要點(diǎn)。分析認(rèn)為：Assel機(jī)組生產(chǎn)高精度鉆具用管時(shí)，其減徑量大、軋制過程抖動(dòng)劇烈，微張力定（減）徑機(jī)架的減徑量分配和軋制參數(shù)設(shè)置難，且內(nèi)徑公差要求高；采用減徑軋制，將減徑量分配在穿孔機(jī)、Assel軋管機(jī)、定徑機(jī)3道工序，降低穿孔主機(jī)及軋機(jī)速度，增加保護(hù)導(dǎo)套裝置等措施，可提高厚壁鉆具用管壁厚精度及外徑精度，使內(nèi)徑尺寸滿足要求。Abstract: Described here in the paper are the requirements for geometric dimensional accuracy of the heavywall drill-purpose pipe.Also analyzed on the basis of the process characteristics of the Assel pipe mill are the control difficulties and critical points concerning manufacturing the pipe.The analysis result reveals that in case of producing the said pipe with the Assel mill，it is rather difficult to set up the reduction amount distribution and the rolling parameters of the slight-stretch sizing（reducing） mill stand，and high inner diameter tolerance is required due to big reduction amount that causes dramatic trembling during the rolling operation.It is possible to improve on both the W.T.and O.D.accuracies of the heavy-wall drill-purpose pipe so as to meet the I.D.requirement by means of employing reduction-rolling process to distribute the reduction amount to the three main rolling units， i.e.， the piercer，the Assel mill proper and the sizing mill，decreasing the running speeds of the piercing mill and the rolling mill proper，and adding preventive guide bush device，etc.
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