金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)片(pian)(pian)也是(shi)一種實體金屬(shu)墊(dian)(dian)(dian)片(pian)(pian)，墊(dian)(dian)(dian)片(pian)(pian)的剖(pou)切(qie)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(kuan)度c=0.2~0.3mm.在(zai)密(mi)封(feng)面上車削若干個同心圓(yuan)，其齒(chi)(chi)(chi)數為(wei)7~16,視墊(dian)(dian)(dian)片(pian)(pian)的規格大小(xiao)而定。金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)片(pian)(pian)的結構型(xing)式有(you)基(ji)本型(xing)、帶(dai)(dai)外(wai)環型(xing)、帶(dai)(dai)內環型(xing)及帶(dai)(dai)內外(wai)環型(xing)四種，比較(jiao)常見的結構為(wei)基(ji)本型(xing)。由于金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)片(pian)(pian)密(mi)封(feng)表(biao)面接觸區的V型(xing)肋形(xing)成(cheng)許(xu)多具有(you)壓(ya)差的空間線接觸，所以密(mi)封(feng)可靠，使用(yong)(yong)(yong)周期長(chang)。和一般金屬(shu)墊(dian)(dian)(dian)片(pian)(pian)相比，這種墊(dian)(dian)(dian)片(pian)(pian)需要的壓(ya)緊力(li)較(jiao)小(xiao)。金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)片(pian)(pian)的缺點是(shi)，在(zai)每(mei)次更換墊(dian)(dian)(dian)片(pian)(pian)時(shi)，都要對兩法(fa)蘭(lan)(lan)密(mi)封(feng)面進行加工，因而費時(shi)費力(li)。另外(wai)，墊(dian)(dian)(dian)片(pian)(pian)使用(yong)(yong)(yong)后容(rong)易在(zai)法(fa)蘭(lan)(lan)密(mi)封(feng)面上留下壓(ya)痕(hen)，故(gu)一般用(yong)(yong)(yong)于較(jiao)少拆卸的部位。金屬(shu)齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)片(pian)(pian)適用(yong)(yong)(yong)的公(gong)稱壓(ya)力(li)為(wei)1.6~25.0MPa.


一、金(jin)屬齒形(xing)墊片型式、尺寸與(yu)公差


1. 型(xing)式與尺(chi)寸


 公稱壓力PN為4.0MPa、6.3MPa、10.0MPa及16.0MPa的凹(ao)凸面管(guan)法蘭用(yong)金屬(shu)齒形墊片的形式如圖14-2所示(shi)，尺寸見表(biao)14-6。


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 公稱壓力(li)PN為(wei)20.0MPa的(de)凹凸面管法蘭(lan)用(yong)金屬(shu)齒形墊(dian)片的(de)形式見(jian)圖14-2,尺寸見(jian)表14-7。


2. 尺寸公差


 a. 金屬齒(chi)形(xing)墊(dian)片尺寸(cun)極限偏差見表14-8.


 b. 金屬齒形墊(dian)片兩(liang)端面平行度極限偏(pian)差為(wei)每(mei)100mm直徑長度不大于(yu)0.1mm。



二、金(jin)屬齒形墊片技術要求


1. 材料 


 金屬齒(chi)形墊(dian)片(pian)材料及適用的溫(wen)度(du)范圍(wei)見表14-9,材料的其他(ta)技術要(yao)求(qiu)應(ying)符合相應(ying)標準的規定。


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2. 表面(mian)粗糙度(du) 


 金屬齒形墊(dian)片(pian)齒頂平面的(de)表面粗糙度不大(da)于(yu)Ra1.6μm.


三、金(jin)屬齒形墊片標(biao)記


1. 標(biao)記方法


 金(jin)屬齒(chi)形墊片(pian)標(biao)記由公(gong)稱通(tong)徑、公(gong)稱壓力、材料(liao)及(ji)標(biao)準編(bian)號等部分組成。


2. 標記示例


 公(gong)稱通徑100mm、公(gong)稱壓力(li)6.3MPa、材(cai)料為0Cr19Ni9的凹凸面管法(fa)蘭(lan)用金屬齒(chi)形墊片的標記為： 齒(chi)形墊  100-63  0Cr19Ni9  JB/T 88-1994