在(zai)玉雕(diao)工(gong)艺(yi)当中,由于技术设备的不(bu)断进不(bu),在(zai)雕(diao)刻工(gong)艺(yi)上就有了(le)新(xin)工(gong)与(yu)老(lao)工(gong)的差异,这些差异在(zai)玉雕(diao)过(guo)程当中留(liu)下了(le)不(bu)同(tong)的痕迹。新(xin)工(gong)与(yu)老(lao)工(gong)的不(bu)同(tong)之处,在(zai)通(tong)过(guo)放(fang)大镜仔细观察,总能见到(dao)许许多多不(bu)同(tong)的加工(gong)痕迹,下面(mian)苏州阿郎玉器有限(xian)公司就其中一些典型特征做一个对比:
1.线(xian)(xian)(xian)条(tiao)(tiao)(tiao)(tiao)(tiao):老(lao)工(gong)由于速度慢,在线(xian)(xian)(xian)条(tiao)(tiao)(tiao)(tiao)(tiao)的(de)处理上比较流畅,线(xian)(xian)(xian)条(tiao)(tiao)(tiao)(tiao)(tiao)两侧沟(gou)(gou)边(bian)没有(you)崩口,沟(gou)(gou)底呈(cheng)现(xian)(xian)磨(mo)砂(sha)状,无明显长条(tiao)(tiao)(tiao)(tiao)(tiao)形(xing)磨(mo)痕(hen)(hen)。做(zuo)工(gong)不细的(de)老(lao)工(gong)下,有(you)时(shi)候可(ke)以见到铊轮奏素不均(jun),而(er)初(chu)夏(xia)的(de)沟(gou)(gou)底坑洼,沟(gou)(gou)线(xian)(xian)(xian)有(you)宽有(you)窄的(de)现(xian)(xian)象。新工(gong)当(dang)中,线(xian)(xian)(xian)条(tiao)(tiao)(tiao)(tiao)(tiao)是(shi)(shi)用砂(sha)轮砣,在高速磨(mo)削下形(xing)成(cheng)的(de),下调(diao)边(bian)缘往往出现(xian)(xian)玉石(shi)的(de)崩口,使线(xian)(xian)(xian)条(tiao)(tiao)(tiao)(tiao)(tiao)出现(xian)(xian)锯齿(chi)形(xing)边(bian)沿。新工(gong)的(de)沟(gou)(gou)底还(hai)会有(you)长条(tiao)(tiao)(tiao)(tiao)(tiao)状磨(mo)痕(hen)(hen),这是(shi)(shi)由于砂(sha)轮砣上的(de)砂(sha)砾不可(ke)能排列非常(chang)均(jun)匀索划出的(de)。
2.钻(zuan)孔(kong)(kong):老工钻(zuan)孔(kong)(kong)靠的是玉砂,孔(kong)(kong)壁(bi)磨砂状,砂粒粗的时候会有(you)沟(gou)痕(hen)(hen),沟(gou)痕(hen)(hen)呈现不规(gui)律状。新工使(shi)用金(jin)刚砂磨具,孔(kong)(kong)壁(bi)有(you)沟(gou)痕(hen)(hen)成(cheng)螺(luo)旋状。
3.开(kai)窗(chuang):老工在(zai)开(kai)窗(chuang)是(shi)(shi)在(zai)钻孔中穿过钢丝(si)线锯,再配合解玉砂浆用手工拉玉,其特(te)点(dian)是(shi)(shi)在(zai)窗(chuang)口的(de)内壁(bi)上有线锯的(de)拉痕(hen)。新工也是(shi)(shi)先钻眼,然后沿钻眼处用告诉磨具将窗(chuang)口的(de)玉料磨去,知(zhi)道祛除(chu)芯子全(quan)部磨掉。
4.成(cheng)洞:老(lao)工制作两(liang)面不透的洞时,用(yong)解玉(yu)砂和顶(ding)铊慢慢磨压出(chu)来的。由(you)于(yu)切削量(liang)大,往往会 留下磨砂现(xian)象。新工会在动笔(bi)上留下螺旋状磨痕。
5.抛(pao)(pao)光(guang):老工抛(pao)(pao)光(guang)均匀,未(wei)抛(pao)(pao)光(guang)和抛(pao)(pao)光(guang)处(chu)的反(fan)差小;新工由于急(ji)于求成(cheng),在抛(pao)(pao)光(guang)上有(you)些(xie)工件在弯曲(qu)弧(hu)度(du)时有(you)过(guo)度(du)不均,边(bian)边(bian)角角都有(you)死(si)角,未(wei)抛(pao)(pao)光(guang)处(chu)与抛(pao)(pao)光(guang)处(chu)的反(fan)差大。
6.圆雕(diao):在雕(diao)刻圆弧面的时候(hou),老工(gong)细腻无过渡(du)磨损,新工(gong)由(you)于到(dao)快,圆弧不够原话,会有棱起(qi)的现(xian)象(xiang)。
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