金(jin)屬齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)也是一種實體金(jin)屬墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)，墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)剖切面(mian)(mian)呈鋸齒(chi)(chi)(chi)形(xing)，齒(chi)(chi)(chi)距t=1.5~2mm,齒(chi)(chi)(chi)高(gao)h=0.65~0.85mm,齒(chi)(chi)(chi)頂寬度(du)c=0.2~0.3mm.在密(mi)封(feng)面(mian)(mian)上車削若干個同心(xin)圓(yuan)，其(qi)齒(chi)(chi)(chi)數為(wei)7~16,視墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)規(gui)格大小(xiao)而定(ding)。金(jin)屬齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)結(jie)構型(xing)式有基本型(xing)、帶外環(huan)(huan)型(xing)、帶內(nei)環(huan)(huan)型(xing)及帶內(nei)外環(huan)(huan)型(xing)四種，比(bi)(bi)較常(chang)見的(de)結(jie)構為(wei)基本型(xing)。由(you)于金(jin)屬齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)密(mi)封(feng)表(biao)面(mian)(mian)接觸區的(de)V型(xing)肋(lei)形(xing)成許多具(ju)有壓差的(de)空間線接觸，所(suo)以(yi)密(mi)封(feng)可靠，使用(yong)(yong)周期長(chang)。和一般金(jin)屬墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)相比(bi)(bi)，這(zhe)種墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)需要的(de)壓緊力較小(xiao)。金(jin)屬齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)的(de)缺點是，在每次更換(huan)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)時(shi)，都要對兩法蘭密(mi)封(feng)面(mian)(mian)進行加工，因而費時(shi)費力。另外，墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)使用(yong)(yong)后(hou)容易在法蘭密(mi)封(feng)面(mian)(mian)上留下壓痕，故(gu)一般用(yong)(yong)于較少拆(chai)卸的(de)部(bu)位。金(jin)屬齒(chi)(chi)(chi)形(xing)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)(pian)適用(yong)(yong)的(de)公稱(cheng)壓力為(wei)1.6~25.0MPa.


一、金屬齒形墊片型式、尺寸(cun)與公差(cha)


1. 型式與尺(chi)寸


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


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 公稱(cheng)壓力PN為20.0MPa的凹凸面管法蘭(lan)用金(jin)屬齒形(xing)墊(dian)片的形(xing)式見圖14-2,尺寸見表14-7。


2. 尺寸(cun)公(gong)差


 a. 金屬齒形(xing)墊片尺(chi)寸極限偏(pian)差(cha)見表14-8.


 b. 金屬齒形(xing)墊(dian)片兩(liang)端面(mian)平行度極限偏差為每100mm直徑長度不大于(yu)0.1mm。



二、金屬齒形墊片技術要求


1. 材(cai)料 


 金屬齒形墊片材料及適用的溫度(du)范圍見表14-9,材料的其他技(ji)術(shu)要(yao)求應符合相應標準的規定。


9.jpg


2. 表面粗糙度(du) 


 金屬齒形墊片齒頂平面的(de)表面粗糙度不大于Ra1.6μm.


三、金屬齒形墊片標記


1. 標記方(fang)法


 金(jin)屬齒形墊片標記由公稱(cheng)通徑、公稱(cheng)壓力(li)、材(cai)料及標準編號等部(bu)分組成。


2. 標記示例


 公稱(cheng)通(tong)徑100mm、公稱(cheng)壓(ya)力6.3MPa、材料為(wei)0Cr19Ni9的凹凸面管(guan)法蘭用金屬齒(chi)形(xing)墊片的標記(ji)為(wei)： 齒(chi)形(xing)墊  100-63  0Cr19Ni9  JB/T 88-1994