三輥微張減全長(zhǎng)縱向壁厚不均影響因素探討

1、三輥微張減全長(zhǎng)縱向壁厚不均影響因素探討摘要:通過(guò)在三輥減徑機(jī)上跟蹤總結(jié)疊加比I減徑量△DDS(徑壁比)與縱向壁厚差的關(guān)系合理確定工藝參數(shù)使全長(zhǎng)縱向壁厚差△S0.6mm鋼管實(shí)物質(zhì)量及尺寸精度完全符合GBT81621999標(biāo)準(zhǔn)要求.關(guān)鍵詞:縱向壁厚不均影響因素探討前言隨著現(xiàn)在無(wú)縫管生產(chǎn)工藝的發(fā)展微張減在無(wú)縫管生產(chǎn)中迅速推廣應(yīng)用愈來(lái)愈廣泛但微張減主要缺陷之一是容易產(chǎn)生管端增厚同時(shí)由于疊加比原因產(chǎn)生張力使鋼管中間壁厚與兩端壁厚相差較大壁厚差甚至

2、相差2mm影響用戶的對(duì)鋼管的加工和使用.我公司新上十二架微張力三輥減徑機(jī)生產(chǎn)初期由于工藝參數(shù)原因?qū)е氯L(zhǎng)壁厚不均嚴(yán)重影響產(chǎn)品形象.在生產(chǎn)中多次試驗(yàn)和總結(jié)對(duì)全長(zhǎng)縱向壁厚不均的影響因素作了分析和探討采用新的工藝參數(shù)使鋼管質(zhì)量符合標(biāo)準(zhǔn)要求.一.全長(zhǎng)縱向壁厚不均與疊加比的關(guān)系壁厚變化量:ε=[2Zm(V01)(1V0)][Zm(1V0)(2V0)]式中:V0=S0D0從式中可以看出減徑前后壁厚變化量與張力系數(shù)關(guān)系極大而張力系數(shù)與疊加比關(guān)系較大.

3、從生產(chǎn)實(shí)驗(yàn)中可以得出疊加比I是影響縱向壁厚不均的一個(gè)重要因素.以125mm坯料生產(chǎn)8314規(guī)格為例:154.33338516201516.215.614.715.515.10.523.53碳結(jié)125.833382131212.412.812.61212.512.250.3514.63碳結(jié)135.384684141413.413.913.6513.213.713.450.216.67碳結(jié)154.66678316.51315.416.315

4、.8514.915.815.350.515.66碳結(jié)164.3758517.51516.317.216.7516.216.716.450.317.65碳結(jié)184.6111100201718.419.819.118.218.918.550.5517碳結(jié)204.15104242120.52221.2520.052120.5250.72520.19碳結(jié)223.7727104242121.823.322.5521.622.822.20.3520

5、.19碳結(jié)223.7727104242121.9522.822.37521.0522.8521.950.42520.19碳結(jié)146.357110515.31614.715.31514.214.814.50.515.24碳結(jié)165.5625100.517.511.516.717.31716.21716.60.411.44碳結(jié)175.23539918.31016.8518.617.72517.118.117.60.12510.1碳結(jié)184.

6、944410119.51217.8519.618.72518.3518.918.6250.111.88碳結(jié)204.4510422152122.221.620.521.621.050.5514.42碳結(jié)164.759617.52016.317.71715.61716.30.720.83合結(jié)109.510211.5710.111.310.67510.410.910.650.0256.863合結(jié)127.9167104.513.59.512.4

7、12.812.612.3512.7512.550.059.091碳結(jié)146.785710415.2914.715.615.12514.615.3514.9750.158.654碳結(jié)165.937510416.8916.717.617.1516.317.216.750.48.654碳結(jié)138109137.412.213.212.67512.713.1512.9250.256.789碳結(jié)1010.811211410.111.110.610.

8、3510.8510.603.571碳結(jié)12911213.5412.113.112.612.451312.7250.1253.571合結(jié)194.368495201219.219.819.519.2519.719.4750.02512.63碳結(jié)9101009109.8510.410.19.59.859.6750.42510碳結(jié)126.6667101142112.713.513.112.312.712.50.620.79碳結(jié)165104172

9、416.517.216.8516.416.916.650.223.08碳結(jié)108.3101121810.411.110.7510.310.410.350.417.82碳結(jié)108.310111.51810.611.210.910.4510.7510.60.317.82碳結(jié)126.9167100.513.517.512.11312.5512.3512.7512.55017.41碳結(jié)1010.81111139.9511.610.77510.3

10、10.6510.4750.32.703碳結(jié)1010.811111310.111.410.72510.410.7510.5750.152.703碳結(jié)129112.5134.512.413.212.812.512.9512.7250.0754碳結(jié)129112.5134.512.213.312.7512.612.9512.7750.0254碳結(jié)從表中列出縱向壁厚差與減徑量的關(guān)系如下:減徑量與壁厚差關(guān)系圖0.500.510102030△D△S系