金(jin)(jin)屬(shu)齒(chi)(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)(pian)也是一(yi)種實體金(jin)(jin)屬(shu)墊(dian)(dian)片(pian)(pian)(pian)，墊(dian)(dian)片(pian)(pian)(pian)的(de)剖切(qie)面呈鋸齒(chi)(chi)(chi)(chi)形(xing)(xing)，齒(chi)(chi)(chi)(chi)距t=1.5~2mm,齒(chi)(chi)(chi)(chi)高h=0.65~0.85mm,齒(chi)(chi)(chi)(chi)頂寬度c=0.2~0.3mm.在(zai)密封面上(shang)車削若干個同心圓(yuan)，其齒(chi)(chi)(chi)(chi)數為(wei)7~16,視墊(dian)(dian)片(pian)(pian)(pian)的(de)規(gui)格大(da)小而定。金(jin)(jin)屬(shu)齒(chi)(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)(pian)的(de)結構(gou)型(xing)式有基(ji)本型(xing)、帶(dai)外環(huan)型(xing)、帶(dai)內(nei)環(huan)型(xing)及帶(dai)內(nei)外環(huan)型(xing)四(si)種，比(bi)較(jiao)常見的(de)結構(gou)為(wei)基(ji)本型(xing)。由于金(jin)(jin)屬(shu)齒(chi)(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)(pian)密封表(biao)面接(jie)觸區的(de)V型(xing)肋(lei)形(xing)(xing)成許多(duo)具有壓(ya)差的(de)空間線接(jie)觸，所以(yi)密封可靠，使(shi)(shi)用周期長。和(he)一(yi)般金(jin)(jin)屬(shu)墊(dian)(dian)片(pian)(pian)(pian)相(xiang)比(bi)，這種墊(dian)(dian)片(pian)(pian)(pian)需要的(de)壓(ya)緊力較(jiao)小。金(jin)(jin)屬(shu)齒(chi)(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)(pian)的(de)缺點(dian)是，在(zai)每次更換墊(dian)(dian)片(pian)(pian)(pian)時(shi)，都要對兩法(fa)蘭(lan)密封面進(jin)行(xing)加工，因而費(fei)時(shi)費(fei)力。另外，墊(dian)(dian)片(pian)(pian)(pian)使(shi)(shi)用后容易在(zai)法(fa)蘭(lan)密封面上(shang)留下(xia)壓(ya)痕，故一(yi)般用于較(jiao)少拆(chai)卸的(de)部位。金(jin)(jin)屬(shu)齒(chi)(chi)(chi)(chi)形(xing)(xing)墊(dian)(dian)片(pian)(pian)(pian)適(shi)用的(de)公稱壓(ya)力為(wei)1.6~25.0MPa.


一、金屬齒形墊(dian)片型式、尺寸與公差


1. 型式與尺寸


 公稱壓力PN為4.0MPa、6.3MPa、10.0MPa及16.0MPa的凹凸面管法蘭(lan)用金屬(shu)齒形墊片的形式如圖14-2所(suo)示(shi)，尺寸見表14-6。


8.jpg


 公稱壓力(li)PN為20.0MPa的凹凸面管法蘭用金屬齒(chi)形墊片的形式(shi)見(jian)圖(tu)14-2,尺寸見(jian)表(biao)14-7。


2. 尺(chi)寸公差


 a. 金屬齒形(xing)墊片尺寸極限偏差見(jian)表14-8.


 b. 金屬齒形墊片兩(liang)端面平行度(du)極限偏差(cha)為每(mei)100mm直徑(jing)長度(du)不大于0.1mm。



二、金屬齒形墊(dian)片技術要求


1. 材料 


 金(jin)屬(shu)齒形墊(dian)片材料(liao)(liao)及(ji)適用的(de)溫度范(fan)圍見表14-9,材料(liao)(liao)的(de)其(qi)他技術(shu)要求應符合(he)相應標準的(de)規定。


9.jpg


2. 表面粗糙度(du) 


 金屬齒形墊片齒頂平面的表面粗糙度不大于Ra1.6μm.


三、金(jin)屬(shu)齒形墊片標(biao)記


1. 標記(ji)方(fang)法


 金屬齒形墊(dian)片標(biao)記由公(gong)稱通徑、公(gong)稱壓力、材(cai)料及標(biao)準編(bian)號等部(bu)分組成。


2. 標(biao)記示例


 公稱通徑(jing)100mm、公稱壓(ya)力6.3MPa、材(cai)料為0Cr19Ni9的凹凸(tu)面管法蘭用(yong)金屬齒形(xing)墊片的標(biao)記為： 齒形(xing)墊  100-63  0Cr19Ni9  JB/T 88-1994