金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)也是(shi)一(yi)種(zhong)實體金(jin)屬(shu)(shu)(shu)墊(dian)(dian)片(pian)(pian)，墊(dian)(dian)片(pian)(pian)的(de)剖切面呈鋸齒(chi)(chi)(chi)形(xing)(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(zai)(zai)密(mi)封(feng)面上車削若干個同心(xin)圓，其齒(chi)(chi)(chi)數為7~16,視墊(dian)(dian)片(pian)(pian)的(de)規格大小而(er)定。金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)的(de)結構(gou)型式有(you)基本(ben)型、帶外(wai)環型、帶內(nei)(nei)環型及帶內(nei)(nei)外(wai)環型四種(zhong)，比較(jiao)常(chang)見的(de)結構(gou)為基本(ben)型。由于金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)密(mi)封(feng)表面接(jie)觸(chu)區的(de)V型肋形(xing)(xing)成許多具有(you)壓(ya)(ya)差的(de)空間線接(jie)觸(chu)，所以(yi)密(mi)封(feng)可靠，使用(yong)(yong)周期(qi)長(chang)。和一(yi)般金(jin)屬(shu)(shu)(shu)墊(dian)(dian)片(pian)(pian)相(xiang)比，這(zhe)種(zhong)墊(dian)(dian)片(pian)(pian)需要的(de)壓(ya)(ya)緊(jin)力較(jiao)小。金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)的(de)缺點是(shi)，在(zai)(zai)每次更換墊(dian)(dian)片(pian)(pian)時，都要對兩法(fa)蘭(lan)密(mi)封(feng)面進(jin)行加(jia)工，因(yin)而(er)費時費力。另外(wai)，墊(dian)(dian)片(pian)(pian)使用(yong)(yong)后容易在(zai)(zai)法(fa)蘭(lan)密(mi)封(feng)面上留下(xia)壓(ya)(ya)痕，故一(yi)般用(yong)(yong)于較(jiao)少拆(chai)卸的(de)部位。金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)適用(yong)(yong)的(de)公稱(cheng)壓(ya)(ya)力為1.6~25.0MPa.


一、金屬齒形墊(dian)片型式(shi)、尺寸與公差


1. 型式(shi)與尺(chi)寸(cun)


 公稱(cheng)壓力PN為4.0MPa、6.3MPa、10.0MPa及(ji)16.0MPa的凹凸面管法蘭用金屬齒(chi)形(xing)(xing)墊片的形(xing)(xing)式如圖(tu)14-2所示，尺寸見表14-6。


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 公稱壓力PN為20.0MPa的(de)凹凸面(mian)管法(fa)蘭用金屬齒形墊(dian)片的(de)形式見(jian)圖(tu)14-2,尺寸見(jian)表14-7。


2. 尺寸(cun)公(gong)差


 a. 金屬齒形墊片尺寸(cun)極限偏差見表(biao)14-8.


 b. 金屬(shu)齒(chi)形墊片兩(liang)端面平行度極(ji)限偏(pian)差(cha)為(wei)每100mm直徑長度不(bu)大于0.1mm。



二、金屬齒(chi)形(xing)墊片技術要求


1. 材(cai)料(liao) 


 金屬齒形墊片材(cai)料及適用的溫度范圍(wei)見表14-9,材(cai)料的其他(ta)技(ji)術要求應符合(he)相應標(biao)準的規定。


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2. 表面粗(cu)糙度 


 金屬齒形墊片齒頂平面的表面粗糙度不大于(yu)Ra1.6μm.


三、金屬(shu)齒形墊片標記


1. 標記方(fang)法


 金屬齒形墊片標記由公稱通徑(jing)、公稱壓力、材料及標準編號(hao)等(deng)部(bu)分組成。


2. 標記示例


 公(gong)稱通徑100mm、公(gong)稱壓(ya)力6.3MPa、材料為0Cr19Ni9的凹凸(tu)面管法(fa)蘭(lan)用(yong)金屬齒形(xing)墊(dian)片的標記為： 齒形(xing)墊(dian)  100-63  0Cr19Ni9  JB/T 88-1994