金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)也是(shi)一(yi)種(zhong)實體金(jin)屬(shu)(shu)(shu)墊(dian)(dian)(dian)(dian)片(pian)(pian)，墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)剖切面(mian)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)密(mi)封(feng)(feng)(feng)面(mian)上(shang)車削若干個同心圓，其齒(chi)(chi)(chi)數為7~16,視墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)規格大(da)小而定。金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)結構型(xing)式有基本型(xing)、帶外(wai)環(huan)型(xing)、帶內環(huan)型(xing)及帶內外(wai)環(huan)型(xing)四種(zhong)，比(bi)(bi)較常見的(de)(de)結構為基本型(xing)。由(you)于金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)密(mi)封(feng)(feng)(feng)表(biao)面(mian)接觸(chu)區的(de)(de)V型(xing)肋形(xing)(xing)成(cheng)許(xu)多具有壓(ya)差的(de)(de)空(kong)間線接觸(chu)，所以(yi)密(mi)封(feng)(feng)(feng)可靠，使用(yong)周(zhou)期(qi)長。和一(yi)般金(jin)屬(shu)(shu)(shu)墊(dian)(dian)(dian)(dian)片(pian)(pian)相比(bi)(bi)，這(zhe)種(zhong)墊(dian)(dian)(dian)(dian)片(pian)(pian)需要(yao)的(de)(de)壓(ya)緊力較小。金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)缺(que)點(dian)是(shi)，在(zai)每(mei)次更換墊(dian)(dian)(dian)(dian)片(pian)(pian)時(shi)，都要(yao)對兩法(fa)蘭密(mi)封(feng)(feng)(feng)面(mian)進行加工，因而費時(shi)費力。另外(wai)，墊(dian)(dian)(dian)(dian)片(pian)(pian)使用(yong)后容易(yi)在(zai)法(fa)蘭密(mi)封(feng)(feng)(feng)面(mian)上(shang)留下壓(ya)痕，故一(yi)般用(yong)于較少(shao)拆卸的(de)(de)部(bu)位。金(jin)屬(shu)(shu)(shu)齒(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)適(shi)用(yong)的(de)(de)公稱壓(ya)力為1.6~25.0MPa.


一、金屬齒形(xing)墊片型式、尺寸與公差


1. 型式與尺寸


 公稱壓力(li)PN為4.0MPa、6.3MPa、10.0MPa及(ji)16.0MPa的凹凸面管法蘭用金屬齒形(xing)墊(dian)片的形(xing)式如圖14-2所示，尺寸見表14-6。


8.jpg


 公稱壓力PN為20.0MPa的(de)凹凸(tu)面管法蘭(lan)用金屬(shu)齒形墊片(pian)的(de)形式見(jian)圖(tu)14-2,尺寸見(jian)表14-7。


2. 尺寸公差


 a. 金屬齒形墊片尺寸極限偏差見表(biao)14-8.


 b. 金(jin)屬(shu)齒(chi)形墊片兩端面(mian)平(ping)行度(du)極限(xian)偏差為每100mm直徑(jing)長度(du)不(bu)大于0.1mm。



二、金屬(shu)齒形墊片(pian)技術要求


1. 材料 


 金(jin)屬齒形墊片材(cai)料及適用的(de)溫(wen)度范(fan)圍見表14-9,材(cai)料的(de)其他技術要(yao)求應符合相應標(biao)準(zhun)的(de)規定。


9.jpg


2. 表面(mian)粗(cu)糙度 


 金(jin)屬齒(chi)形墊(dian)片齒(chi)頂(ding)平面的(de)表(biao)面粗糙度不(bu)大(da)于(yu)Ra1.6μm.


三、金屬(shu)齒形墊片標(biao)記


1. 標記方法


 金(jin)屬齒(chi)形墊片(pian)標(biao)記由公稱通徑、公稱壓力、材料及(ji)標(biao)準編(bian)號等部分(fen)組(zu)成。


2. 標記示例


 公稱(cheng)通(tong)徑100mm、公稱(cheng)壓力6.3MPa、材(cai)料為0Cr19Ni9的(de)凹(ao)凸面管法蘭(lan)用金屬(shu)齒形(xing)墊片的(de)標(biao)記為： 齒形(xing)墊  100-63  0Cr19Ni9  JB/T 88-1994