金(jin)(jin)屬齒(chi)形墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)也是一種實體金(jin)(jin)屬墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)，墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)的(de)(de)剖切面(mian)呈鋸齒(chi)形，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.在密(mi)封(feng)面(mian)上車削若干個同(tong)心(xin)圓，其(qi)齒(chi)數為(wei)(wei)7~16,視墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)的(de)(de)規格大小而定。金(jin)(jin)屬齒(chi)形墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)的(de)(de)結構型(xing)(xing)式有基(ji)本型(xing)(xing)、帶(dai)外環(huan)(huan)型(xing)(xing)、帶(dai)內環(huan)(huan)型(xing)(xing)及(ji)帶(dai)內外環(huan)(huan)型(xing)(xing)四(si)種，比(bi)較常見的(de)(de)結構為(wei)(wei)基(ji)本型(xing)(xing)。由于金(jin)(jin)屬齒(chi)形墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)密(mi)封(feng)表(biao)面(mian)接(jie)觸區的(de)(de)V型(xing)(xing)肋形成許多具有壓差的(de)(de)空(kong)間線接(jie)觸，所以(yi)密(mi)封(feng)可靠，使(shi)用周期長。和一般金(jin)(jin)屬墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)相比(bi)，這種墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)需要(yao)的(de)(de)壓緊力(li)較小。金(jin)(jin)屬齒(chi)形墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)的(de)(de)缺點是，在每次更換墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)時(shi)，都(dou)要(yao)對兩法蘭密(mi)封(feng)面(mian)進行加工，因而費(fei)時(shi)費(fei)力(li)。另外，墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)使(shi)用后容易在法蘭密(mi)封(feng)面(mian)上留(liu)下(xia)壓痕，故(gu)一般用于較少(shao)拆(chai)卸的(de)(de)部位。金(jin)(jin)屬齒(chi)形墊(dian)(dian)(dian)(dian)(dian)(dian)片(pian)適用的(de)(de)公稱壓力(li)為(wei)(wei)1.6~25.0MPa.


一、金屬(shu)齒(chi)形墊片型式、尺寸與公(gong)差(cha)


1. 型(xing)式(shi)與尺寸(cun)


 公稱(cheng)壓力PN為4.0MPa、6.3MPa、10.0MPa及16.0MPa的(de)凹(ao)凸面管法(fa)蘭用(yong)金屬(shu)齒形墊片的(de)形式如圖14-2所示，尺寸見表14-6。


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 公稱壓力PN為20.0MPa的凹凸面管(guan)法蘭用金屬齒形墊片(pian)的形式(shi)見圖14-2,尺寸見表14-7。


2. 尺寸公差


 a. 金屬(shu)齒(chi)形(xing)墊(dian)片尺寸極限偏(pian)差見表14-8.


 b. 金屬齒形墊片兩端面平行(xing)度極限偏差(cha)為(wei)每100mm直徑(jing)長度不大于0.1mm。



二、金屬齒形墊片(pian)技術要求


1. 材(cai)料(liao) 


 金(jin)屬齒(chi)形墊片(pian)材料(liao)及適用的(de)溫度范圍(wei)見表14-9,材料(liao)的(de)其(qi)他(ta)技術(shu)要求應符合相應標準的(de)規定。


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2. 表(biao)面粗糙(cao)度 


 金屬齒形墊(dian)片齒頂平面的表面粗(cu)糙度不大(da)于Ra1.6μm.


三(san)、金屬齒形墊(dian)片標記


1. 標記方法


 金(jin)屬齒形(xing)墊片標(biao)記由公(gong)稱(cheng)通徑、公(gong)稱(cheng)壓力、材料及標(biao)準(zhun)編(bian)號等部分組成。


2. 標記示例(li)


 公稱通(tong)徑100mm、公稱壓力6.3MPa、材料為0Cr19Ni9的(de)凹凸(tu)面管法蘭用金(jin)屬齒形(xing)墊片的(de)標(biao)記為： 齒形(xing)墊  100-63  0Cr19Ni9  JB/T 88-1994