制(Zhi)作(Zuo)PCB板(Ban)中(Zhong)有(You)哪(Na)些(Xie)特(Te)殊(Shu)工(Gong)艺(Yi)的(De)孔(Kong)？(?)

1.沉(Chen)头(Tou)孔(Kong) --- 最(Zui)外(Wai)/最(Zui)大(Da)孔(Kong)径(Jing)处(Chu)的(De)孔(Kong)壁(Bi)与(Yu)最(Zui)小(Xiao)孔(Kong)处(Chu)的(De)孔(Kong)壁(Bi)的(De)过(Guo)渡(Du)部(Bu)分(Fen)是(Shi)与(Yu)pcb表(Biao)面(Mian)平(Ping)行(Xing)的(De)，(?)连(Lian)接(Jie)大(Da)小(Xiao)孔(Kong)部(Bu)分(Fen)是(Shi)平(Ping)面(Mian)，(?)不(Bu)是(Shi)斜(Xie)面(Mian)。(?)

 大(Da)小(Xiao)孔(Kong)连(Lian)接(Jie)部(Bu)分(Fen)是(Shi)斜(Xie)面(Mian)，(?)不(Bu)是(Shi)平(Ping)面(Mian)。(?)注(Zhu)意(Yi)有(You)角(Jiao)度(Du)(0-180度(Du))的(De)控(Kong)制(Zhi)

2.埋(Mai)头(Tou)孔(Kong) --- 漏(Lou)斗(Dou)孔(Kong)，(?)只(Zhi)不(Bu)过(Guo)安(An)装(Zhuang)用(Yong)的(De)螺(Luo)钉(Ding)之(Zhi)类(Lei)的(De)东(Dong)西(Xi)的(De)顶(Ding)部(Bu)全(Quan)部(Bu)在(Zai)pcb表(Biao)面(Mian)一(Yi)下(Xia)。(?)大(Da)小(Xiao)孔(Kong)连(Lian)接(Jie)部(Bu)分(Fen)是(Shi)斜(Xie)面(Mian)，(?)不(Bu)是(Shi)平(Ping)面(Mian)。(?)

3. 喇(La)叭(Ba)孔(Kong) --- 类(Lei)似(Si)埋(Mai)头(Tou)孔(Kong)

4. 压(Ya)接(Jie)孔(Kong) --- 孔(Kong)径(Jing)没(Mei)有(You)变(Bian)化(Hua)，(?)但(Dan)是(Shi)孔(Kong)径(Jing)公(Gong)差(Cha)一(Yi)般(Ban)是(Shi)+/-2mil, 要(Yao)求(Qiu)很(Hen)严(Yan)格(Ge)，(?)插(Cha)件(Jian)的(De)脚(Jiao)一(Yi)般(Ban)不(Bu)需(Xu)要(Yao)焊(Han)接(Jie)的(De)。(?)一(Yi)般(Ban)的(De)压(Ya)接(Jie)孔(Kong)是(Shi)镀(Du)铜(Tong)的(De)

插(Cha)件(Jian)孔(Kong)。(?)一(Yi)般(Ban)常(Chang)会(Hui)用(Yong)到(Dao)的(De)是(Shi)埋(Mai)头(Tou)孔(Kong)比(Bi)较(Jiao)多(Duo)。(?)

沉(Chen)头(Tou)孔(Kong)的(De)加(Jia)工(Gong)方(Fang)法(Fa)包(Bao)括(Kuo)钻(Zuan)孔(Kong)加(Jia)工(Gong)和(He)沉(Chen)孔(Kong)加(Jia)工(Gong)。(?)沉(Chen)孔(Kong)又(You)分(Fen)为(Wei)平(Ping)底(Di)沉(Chen)孔(Kong)和(He)锥(Zhui)沉(Chen)孔(Kong)。(?)
   无(Wu)论(Lun)哪(Na)种(Zhong)沉(Chen)头(Tou)孔(Kong)，(?)都(Du)需(Xu)首(Shou)先(Xian)用(Yong)钻(Zuan)头(Tou)钻(Zuan)削(Xiao)出(Chu)主(Zhu)要(Yao)通(Tong)孔(Kong)，(?)然(Ran)后(Hou)根(Gen)据(Ju)沉(Chen)孔(Kong)形(Xing)状(Zhuang)选(Xuan)择(Ze)不(Bu)同(Tong)刀(Dao)具(Ju)进(Jin)行(Xing)沉(Chen)孔(Kong)加(Jia)工(Gong)。(?)平(Ping)底(Di)沉(Chen)孔(Kong)加(Jia)工(Gong)需(Xu)在(Zai)钻(Zuan)孔(Kong)基(Ji)

础(Chu)上(Shang)，(?)通(Tong)过(Guo)端(Duan)铣(Xi)刀(Dao)铣(Xi)出(Chu)沉(Chen)孔(Kong)。(?)锥(Zhui)沉(Chen)孔(Kong)需(Xu)用(Yong)较(Jiao)大(Da)钻(Zuan)头(Tou)在(Zai)已(Yi)钻(Zuan)孔(Kong)上(Shang)进(Jin)行(Xing)锪(Huo)孔(Kong)加(Jia)工(Gong)。(?)沉(Chen)孔(Kong)加(Jia)工(Gong)时(Shi)，(?)保(Bao)证(Zheng)工(Gong)件(Jian)一(Yi)次(Ci)定(Ding)位(Wei)，(?)确(Que)保(Bao)孔(Kong)与(Yu)沉(Chen)孔(Kong)

的(De)同(Tong)轴(Zhou)度(Du)。(?)