金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)也是一(yi)(yi)種(zhong)實體(ti)金屬(shu)墊(dian)(dian)(dian)(dian)(dian)片(pian)，墊(dian)(dian)(dian)(dian)(dian)片(pian)的(de)剖切面呈鋸齒(chi)(chi)(chi)形(xing)，齒(chi)(chi)(chi)距t=1.5~2mm,齒(chi)(chi)(chi)高h=0.65~0.85mm,齒(chi)(chi)(chi)頂寬度c=0.2~0.3mm.在密(mi)封(feng)(feng)面上(shang)車削(xue)若干個同心圓(yuan)，其齒(chi)(chi)(chi)數為7~16,視墊(dian)(dian)(dian)(dian)(dian)片(pian)的(de)規(gui)格大小(xiao)而(er)定。金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)的(de)結構(gou)(gou)型(xing)式(shi)有基本型(xing)、帶外環型(xing)、帶內環型(xing)及(ji)帶內外環型(xing)四種(zhong)，比(bi)較(jiao)常見的(de)結構(gou)(gou)為基本型(xing)。由于(yu)金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)密(mi)封(feng)(feng)表面接(jie)觸(chu)區的(de)V型(xing)肋形(xing)成許多具(ju)有壓差的(de)空間線接(jie)觸(chu)，所以密(mi)封(feng)(feng)可靠(kao)，使(shi)用(yong)周期長。和一(yi)(yi)般金屬(shu)墊(dian)(dian)(dian)(dian)(dian)片(pian)相比(bi)，這(zhe)種(zhong)墊(dian)(dian)(dian)(dian)(dian)片(pian)需要(yao)的(de)壓緊力較(jiao)小(xiao)。金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)的(de)缺點是，在每次更換墊(dian)(dian)(dian)(dian)(dian)片(pian)時(shi)，都要(yao)對兩法蘭密(mi)封(feng)(feng)面進行加工，因(yin)而(er)費時(shi)費力。另外，墊(dian)(dian)(dian)(dian)(dian)片(pian)使(shi)用(yong)后容易在法蘭密(mi)封(feng)(feng)面上(shang)留下(xia)壓痕，故一(yi)(yi)般用(yong)于(yu)較(jiao)少拆卸的(de)部(bu)位。金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)適用(yong)的(de)公稱壓力為1.6~25.0MPa.


一、金屬齒(chi)形墊片型式(shi)、尺寸與公差


1. 型(xing)式與尺寸


 公稱(cheng)壓(ya)力PN為4.0MPa、6.3MPa、10.0MPa及16.0MPa的凹凸面管法(fa)蘭用金屬齒形(xing)墊片的形(xing)式如(ru)圖14-2所示，尺寸(cun)見表14-6。


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 公稱壓力(li)PN為20.0MPa的凹(ao)凸(tu)面(mian)管法蘭用金屬齒形墊片的形式見(jian)圖14-2,尺寸(cun)見(jian)表(biao)14-7。


2. 尺寸(cun)公差


 a. 金屬齒形墊片尺寸極限偏差見表(biao)14-8.


 b. 金屬齒形墊片(pian)兩(liang)端(duan)面(mian)平(ping)行度極限偏差為(wei)每100mm直徑長度不大于(yu)0.1mm。



二、金屬(shu)齒形墊片(pian)技術要求


1. 材料 


 金屬齒形墊片材料及適用的(de)(de)溫度(du)范圍(wei)見表14-9,材料的(de)(de)其(qi)他技術要求應(ying)符合相應(ying)標準的(de)(de)規定。


9.jpg


2. 表面粗(cu)糙(cao)度 


 金屬齒形墊片齒頂平面的表面粗糙度(du)不大(da)于Ra1.6μm.


三、金(jin)屬齒形墊片標記


1. 標記方(fang)法


 金屬齒形(xing)墊片(pian)標記由公稱(cheng)(cheng)通徑、公稱(cheng)(cheng)壓力、材料及標準編號等部分組成。


2. 標記(ji)示例


 公稱(cheng)通徑100mm、公稱(cheng)壓力6.3MPa、材料(liao)為0Cr19Ni9的凹凸面管(guan)法(fa)蘭用金(jin)屬齒形墊片的標記為： 齒形墊  100-63  0Cr19Ni9  JB/T 88-1994