金(jin)(jin)(jin)屬(shu)(shu)(shu)齒(chi)形墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)也是(shi)一種實體金(jin)(jin)(jin)屬(shu)(shu)(shu)墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)，墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)(de)剖切面(mian)呈鋸齒(chi)形，齒(chi)距t=1.5~2mm,齒(chi)高(gao)h=0.65~0.85mm,齒(chi)頂寬度c=0.2~0.3mm.在(zai)密封面(mian)上車削若干個(ge)同心圓，其齒(chi)數為7~16,視墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)(de)規格大小而定。金(jin)(jin)(jin)屬(shu)(shu)(shu)齒(chi)形墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)(de)結(jie)構(gou)型(xing)式有基本型(xing)、帶(dai)(dai)外環(huan)型(xing)、帶(dai)(dai)內環(huan)型(xing)及帶(dai)(dai)內外環(huan)型(xing)四種，比(bi)較常見的(de)(de)結(jie)構(gou)為基本型(xing)。由于金(jin)(jin)(jin)屬(shu)(shu)(shu)齒(chi)形墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)密封表(biao)面(mian)接觸(chu)區(qu)的(de)(de)V型(xing)肋形成許多具有壓(ya)(ya)差的(de)(de)空間線(xian)接觸(chu)，所(suo)以密封可靠，使(shi)用周期長。和一般金(jin)(jin)(jin)屬(shu)(shu)(shu)墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)相比(bi)，這(zhe)種墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)需要的(de)(de)壓(ya)(ya)緊力較小。金(jin)(jin)(jin)屬(shu)(shu)(shu)齒(chi)形墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)(de)缺點是(shi)，在(zai)每(mei)次更換墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)時(shi)，都要對兩(liang)法(fa)蘭(lan)密封面(mian)進(jin)行加(jia)工，因而費時(shi)費力。另(ling)外，墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)使(shi)用后容(rong)易(yi)在(zai)法(fa)蘭(lan)密封面(mian)上留下壓(ya)(ya)痕，故一般用于較少(shao)拆卸(xie)的(de)(de)部位。金(jin)(jin)(jin)屬(shu)(shu)(shu)齒(chi)形墊(dian)(dian)(dian)片(pian)(pian)(pian)(pian)適用的(de)(de)公稱壓(ya)(ya)力為1.6~25.0MPa.


一、金屬(shu)齒形墊片型式、尺寸(cun)與公差


1. 型式(shi)與(yu)尺寸(cun)


 公稱壓力PN為(wei)4.0MPa、6.3MPa、10.0MPa及16.0MPa的凹凸面(mian)管(guan)法蘭用金屬齒形墊片的形式如圖14-2所(suo)示，尺(chi)寸(cun)見表14-6。


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 公稱壓力PN為20.0MPa的凹(ao)凸面管法蘭用金(jin)屬齒形(xing)墊片的形(xing)式見(jian)圖14-2,尺寸見(jian)表14-7。


2. 尺寸公差


 a. 金(jin)屬齒形墊片(pian)尺(chi)寸(cun)極限偏(pian)差(cha)見表14-8.


 b. 金屬齒(chi)形墊片(pian)兩端面(mian)平(ping)行度極限偏(pian)差(cha)為(wei)每100mm直徑長度不大于(yu)0.1mm。



二、金屬齒形墊片(pian)技術要求


1. 材(cai)料(liao) 


 金(jin)屬(shu)齒形墊片材料(liao)及適(shi)用的溫度范圍見表14-9,材料(liao)的其(qi)他技術要求應符合相應標準的規定。


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2. 表面粗糙度(du) 


 金屬(shu)齒形墊片齒頂平面(mian)(mian)的(de)表面(mian)(mian)粗糙度不大于Ra1.6μm.


三、金(jin)屬齒形墊(dian)片標記


1. 標記方法


 金屬齒形墊片標(biao)記(ji)由公稱通徑、公稱壓力、材料(liao)及標(biao)準編(bian)號等部分組(zu)成。


2. 標記示例


 公(gong)稱通徑100mm、公(gong)稱壓力6.3MPa、材(cai)料為(wei)0Cr19Ni9的凹凸面管法(fa)蘭用(yong)金屬齒形(xing)墊片的標記為(wei)： 齒形(xing)墊  100-63  0Cr19Ni9  JB/T 88-1994