廣東創(chuàng)新科技職業(yè)學(xué)院項(xiàng)目十四螺紋加工練習(xí)［學(xué)習(xí)目標(biāo)］ 1．熟悉數(shù)控切削螺紋的要點(diǎn)及相關(guān)計(jì)算 2．學(xué)會(huì)FANUC的T系統(tǒng)與GSK980T的螺紋加工指令使用［學(xué)習(xí)重點(diǎn)］ 螺紋加工指令使用［學(xué)習(xí)難點(diǎn)］ 螺紋切削指令的格式一、基本知識(shí)學(xué)習(xí)（一）螺紋切削工藝要點(diǎn)1． 相關(guān)計(jì)算 螺紋牙型高度h=0.6495P直徑方向計(jì)牙深約為1.3PP—螺距（不是導(dǎo)程）2．螺紋起點(diǎn)與終點(diǎn)軸向尺寸升速起刀段：不小于兩倍導(dǎo)程降速退刀段：不小于（1~1.5）導(dǎo)程3．分層切深（以直徑計(jì)）一般第一刀取0.5P后取前一刀的0.7倍遞減單刀最大切深一般不大于1，最小不小于0.1，常見螺距的螺紋切深可參考表1-14-1。舉例（參考）：P=2.0牙深1.299分層為0.9+0.6+0.6+0.4+0.1P=2.5牙深1.624分層為1.0+0.7+0.6+0.4+0.4+0.154．螺紋頂徑控制在螺紋切削時(shí)，由于刀具的擠壓使得最后加工出來的頂徑處塑性膨脹，從而影響螺紋的裝配和正常使用，考慮到這個(gè)問題，在螺紋切削前的圓柱加工中，先多切除一部分材料，將外圓柱先車小，內(nèi)圓柱先車大，這個(gè)值一般大約是0.2~0.3mm。5．刀具使用目前螺紋加工一般是兩種加工情況，一類是使用高速鋼材料低速加工，另一類是使用硬質(zhì)合金、涂層刀具等進(jìn)行高速加工，編程時(shí)要根據(jù)刀具材料情況設(shè)定轉(zhuǎn)速。（二） 編程指令1．單行程螺紋切削指令G32FANUC0i-MATE-TC系統(tǒng)格式：G32X（U）___Z（W）___F___

X、Z：取值為螺紋終點(diǎn)坐標(biāo)值；U、W：取值為螺紋終點(diǎn)相對(duì)循環(huán)起點(diǎn)的坐標(biāo)分量；F：螺紋的導(dǎo)程。SIMENS802D系統(tǒng)格式：G33Z...K...:圓柱螺紋,K表示導(dǎo)程。G33Z...X...K...:圓錐螺紋,K表示導(dǎo)程，Z軸位移較大，錐角小于45度。G33Z...X...I...:圓錐螺紋,I表示導(dǎo)程，X軸位移較大，錐角大于45度。G33X...I...:端面螺紋,I表示導(dǎo)程。2．螺紋切削循環(huán)指令G92格式：G92X（U）___Z（W）___R___F___圖1-14-1螺紋切削循環(huán)軌跡3．螺紋切削復(fù)合循環(huán)指令（1）FANUC0i-MATE-TC系統(tǒng)G76指令（2）SIMENS802D系統(tǒng)CYCLE97指令詳細(xì)注解見下一項(xiàng)目。二、實(shí)踐訓(xùn)練1．實(shí)訓(xùn)內(nèi)容：編程加工帶螺紋零件2．加工要求：3．基本工藝及參考程序工步號(hào)工步內(nèi)容刀具號(hào)刀具名稱刀具規(guī)格主軸轉(zhuǎn)速r/min進(jìn)給速度mm/min切削深度mm1粗車外輪廓T0193°硬質(zhì)合金外圓車刀93°5001201.52精車外輪廓T0193°硬質(zhì)合金外圓車刀93°1000600.253切槽T02高速鋼切槽刀刀寬3mm200304車削螺紋T0360°硬質(zhì)合金三角螺紋車刀60°6001200FANUC0i-MATE-TC系統(tǒng)SIMENS802D系統(tǒng)O1400SC1400N0010G98M03S500N0010G94M03S500N0020T0101N0020M6T1N0030G00X150.0Z100.0N0030G00X150.0Z100.0N0040X45.0Z2.0N0040X45.0Z2.0N0050G71U1.5R1.0F120N0050CYCLE95(“ABCD12：ENDE”，1.5，0.2，0.25，0，120，80，60，9，，，)N0060G71P70Q130U0.5W0.2N0100ABCD12：N0070G00X14.0N0110G00X14.0N0080G01X19.8Z-2.0F60N0120G01X19.8Z-2.0F60N0085Z-15.0N0130Z-15.0N0090X26.0N0140X26.0N0100X29.8Z-17.0N0150X29.8Z-17.0N0110Z-40.0N0160Z-40.0N0120X36.0N0170X36.0N0130Z-46.0N0180Z-46.0N0140G00X150.0Z100.0N0190ENDE：N0150M05N0195G00X150.0Z100.0N0160M00N0200T2S200N0170T0101M03S1000N0210G00X30.0Z-15.0N0170G00X45.0Z2.0N0220G01X16.2F30N0180G70P70Q130N0230X30.0F300N0190G00X150.0Z100.0N0240Z-13.0N0200T0202S200N0250G01X16.0F30N0210G00X30.0Z-15.0N0255G04F2N0220G01X16.2F30N0260G01Z-15.0N0230X30.0F300N0270X40.0F300N0240Z-13.0N0280G00Z-40.0N0250G01X16.0F30N0290G01X24.2F30N0255G04X2N0300X32.0F300N0260G01Z-15.0N0310Z-38.0N0270X40.0F300N0320G01X24.0F30N0280G00Z-40.0N0330G04X2N0290G01X24.2F30N0340G01Z-40.0N0300X32.0F300N0350X32.0F300N0310Z-38.0N0360X150.0Z100.0N0320G01X24.0F30N0370T3S600N0330G04X2N0380G00X19.0Z5.0N0340G01Z-40.0N0390G33Z-12.5K2.5N0350X32.0F300N0400G00X25.N0360X150.0Z100.0N0410Z5.N0370T0303S600N0420X18.3N0380G00X25.0Z5.0N0430G33Z-12.5K2.5N0390G92X19.0Z-12.5F2.5N0440G00X25.N0400X18.3N0450Z5.N0410X17.7N0460X17.7N0420X17.3N0470G33Z-12.5K2.5N0430X16.9N0480G00X25.N0440X16.75N0490Z5.N0450G00X29.1Z-10.0N0500X17.3N0460G32Z-37.5F2.0N0510G33Z-12.5K2.5N0470G00X35.0N0520G00X25.N0480Z-10.0N0530Z5.N0490X28.5N0540X16.9N0500G32Z-37.5F2.0N0550G33Z-12.5K2.5N0510G00X35.0N0560G00X25.N0520Z-10.0N0570Z5.N0530X27.9N0580X16.75N0540G32Z-37.5F2.0N0590G33Z-12.5K2.5N0550G00X35.0N0600G00X29.1Z-10.0N0560Z-10.0N0610G33Z-37.5K2.0N0570X27.5N0620G00X35.0N0580G32Z-37.5F2.0N0630Z-10.0N0590G00X35.0N0640X28.5N0600Z-10.0N0650G33Z-37.5K2.0N0610X27.4N0660G00X35.0N0620G32Z-37.5F2.0N0670Z-10.0N0630G00X35.0N0680X27.9N0640G00X150.0Z100.0N0690G33Z-37.5K2.0N0650T0101N0700G00X35.0N0660M05N0