德州激光切(qie)割機工藝(yi)的優點之一是光束的能(neng)量(liang)(liang)密(mi)度(du)高,個(ge)別10W/cm2。因為能(neng)量(liang)(liang)密(mi)度(du)與4/πd2成正比,所以焦(jiao)點光斑直徑(jing)盡可能(neng)的小,以便(bian)產生一窄的切(qie)縫；同時焦(jiao)點光斑直徑(jing)還(huan)跟透(tou)鏡的焦(jiao)深成正比。

聚焦(jiao)(jiao)(jiao)透(tou)(tou)鏡(jing)焦(jiao)(jiao)(jiao)深(shen)越小(xiao),焦(jiao)(jiao)(jiao)點(dian)(dian)(dian)光(guang)斑(ban)直徑(jing)就越小(xiao)。但數(shu)控切割(ge)(ge)機(ji)切割(ge)(ge)有飛(fei)濺,透(tou)(tou)鏡(jing)離(li)工件太近輕易將透(tou)(tou)鏡(jing)破壞,因此(ci)個(ge)別大功(gong)率(lv)CO2數(shu)控切割(ge)(ge)機(ji)產業利用中(zhong)普遍采取5〃~7.5〃〞(127~190mm)的(de)焦(jiao)(jiao)(jiao)距。實際(ji)焦(jiao)(jiao)(jiao)點(dian)(dian)(dian)光(guang)斑(ban)直徑(jing)在(zai)(zai)(zai)0.1~0.4mm之間。對高品質的(de)切割(ge)(ge),有效焦(jiao)(jiao)(jiao)深(shen)還(huan)跟透(tou)(tou)鏡(jing)直徑(jing)及被(bei)切資(zi)料有關(guan)。例如用5〃的(de)透(tou)(tou)鏡(jing)切碳(tan)鋼(gang),焦(jiao)(jiao)(jiao)深(shen)為焦(jiao)(jiao)(jiao)距的(de) 2%范(fan)疇內,即5mm左右(you)。因此(ci)把持焦(jiao)(jiao)(jiao)點(dian)(dian)(dian)被(bei)切資(zi)料名義(yi)的(de)位置十分重(zhong)要。顧慮(lv)到(dao)切割(ge)(ge)品質、切割(ge)(ge)速度等(deng)因素(su),準則(ze)上(shang)(shang)6mm的(de)金屬資(zi)料,焦(jiao)(jiao)(jiao)點(dian)(dian)(dian)在(zai)(zai)(zai)名義(yi)上(shang)(shang)； 6mm的(de)碳(tan)鋼(gang),焦(jiao)(jiao)(jiao)點(dian)(dian)(dian)在(zai)(zai)(zai)名義(yi)之上(shang)(shang)； 6mm的(de)不銹鋼(gang),焦(jiao)(jiao)(jiao)點(dian)(dian)(dian)在(zai)(zai)(zai)名義(yi)之下。具(ju)體(ti)尺寸由實驗判斷。