金(jin)屬(shu)齒(chi)形(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)也是一種實體(ti)金(jin)屬(shu)墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)，墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)剖切面(mian)呈鋸齒(chi)形(xing)，齒(chi)距t=1.5~2mm,齒(chi)高h=0.65~0.85mm,齒(chi)頂寬度c=0.2~0.3mm.在(zai)密(mi)封(feng)(feng)面(mian)上車(che)削若干個同心圓，其(qi)齒(chi)數為(wei)7~16,視墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)規格大小而定(ding)。金(jin)屬(shu)齒(chi)形(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)結構型(xing)式有基(ji)本型(xing)、帶(dai)外(wai)(wai)環型(xing)、帶(dai)內環型(xing)及(ji)帶(dai)內外(wai)(wai)環型(xing)四種，比(bi)較常(chang)見的(de)結構為(wei)基(ji)本型(xing)。由于金(jin)屬(shu)齒(chi)形(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)密(mi)封(feng)(feng)表面(mian)接(jie)觸區(qu)的(de)V型(xing)肋(lei)形(xing)成許多具有壓(ya)(ya)差(cha)的(de)空間線接(jie)觸，所以密(mi)封(feng)(feng)可靠(kao)，使用周期(qi)長。和一般金(jin)屬(shu)墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)相比(bi)，這種墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)需(xu)要的(de)壓(ya)(ya)緊力(li)(li)較小。金(jin)屬(shu)齒(chi)形(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)缺點是，在(zai)每次(ci)更換墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)時，都要對兩法蘭密(mi)封(feng)(feng)面(mian)進(jin)行加工，因而費時費力(li)(li)。另外(wai)(wai)，墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)使用后容易在(zai)法蘭密(mi)封(feng)(feng)面(mian)上留下壓(ya)(ya)痕，故(gu)一般用于較少(shao)拆卸(xie)的(de)部位。金(jin)屬(shu)齒(chi)形(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)(pian)適(shi)用的(de)公稱壓(ya)(ya)力(li)(li)為(wei)1.6~25.0MPa.


一、金屬齒形墊(dian)片(pian)型式、尺寸與公差


1. 型式與尺(chi)寸


 公稱壓力PN為4.0MPa、6.3MPa、10.0MPa及16.0MPa的凹(ao)凸面管(guan)法蘭用金屬齒形(xing)墊片的形(xing)式如圖14-2所(suo)示(shi)，尺(chi)寸見表14-6。


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 公稱壓力PN為20.0MPa的(de)(de)凹凸面管(guan)法蘭用金(jin)屬齒形(xing)(xing)墊片的(de)(de)形(xing)(xing)式見圖(tu)14-2,尺寸見表(biao)14-7。


2. 尺寸公差(cha)


 a. 金屬齒形墊片尺(chi)寸極限偏差見表14-8.


 b. 金屬齒形墊片兩端(duan)面平(ping)行(xing)度(du)極限(xian)偏差為(wei)每(mei)100mm直徑長度(du)不大于0.1mm。



二、金屬齒形墊(dian)片技術要求


1. 材料(liao) 


 金屬(shu)齒形墊片材(cai)料(liao)及(ji)適用的(de)溫度范(fan)圍見表14-9,材(cai)料(liao)的(de)其他技(ji)術(shu)要求應(ying)符合相應(ying)標準(zhun)的(de)規定(ding)。


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2. 表(biao)面粗糙度 


 金屬齒(chi)形(xing)墊片齒(chi)頂平面(mian)(mian)的表面(mian)(mian)粗糙度不大于Ra1.6μm.


三、金屬齒(chi)形墊片標(biao)記(ji)


1. 標記方(fang)法


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


2. 標記示例(li)


 公(gong)稱通徑100mm、公(gong)稱壓力6.3MPa、材料為0Cr19Ni9的凹凸面管法蘭(lan)用金(jin)屬齒形墊片的標記為： 齒形墊  100-63  0Cr19Ni9  JB/T 88-1994