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金(jin)屬(shu)齒(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)也是一(yi)(yi)種實體(ti)金(jin)屬(shu)墊(dian)(dian)(dian)(dian)片(pian)(pian)，墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)剖切(qie)面呈鋸齒(chi)形(xing)(xing)，齒(chi)距(ju)t=1.5~2mm,齒(chi)高h=0.65~0.85mm,齒(chi)頂寬度c=0.2~0.3mm.在密封(feng)面上(shang)車削若干個同心圓(yuan)，其(qi)齒(chi)數為(wei)7~16,視墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)規格大小而定。金(jin)屬(shu)齒(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)結構型(xing)(xing)式有基本(ben)型(xing)(xing)、帶外(wai)環型(xing)(xing)、帶內(nei)環型(xing)(xing)及(ji)帶內(nei)外(wai)環型(xing)(xing)四(si)種，比較常見的(de)(de)結構為(wei)基本(ben)型(xing)(xing)。由于金(jin)屬(shu)齒(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)密封(feng)表(biao)面接觸區(qu)的(de)(de)V型(xing)(xing)肋(lei)形(xing)(xing)成(cheng)許多具有壓(ya)差的(de)(de)空(kong)間線接觸，所以密封(feng)可(ke)靠，使用周期長(chang)。和一(yi)(yi)般金(jin)屬(shu)墊(dian)(dian)(dian)(dian)片(pian)(pian)相比，這(zhe)種墊(dian)(dian)(dian)(dian)片(pian)(pian)需要的(de)(de)壓(ya)緊力(li)較小。金(jin)屬(shu)齒(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)的(de)(de)缺(que)點是，在每(mei)次更(geng)換墊(dian)(dian)(dian)(dian)片(pian)(pian)時，都(dou)要對兩(liang)法蘭密封(feng)面進行加工，因而費時費力(li)。另外(wai)，墊(dian)(dian)(dian)(dian)片(pian)(pian)使用后容易(yi)在法蘭密封(feng)面上(shang)留下(xia)壓(ya)痕(hen)，故一(yi)(yi)般用于較少(shao)拆卸的(de)(de)部位。金(jin)屬(shu)齒(chi)形(xing)(xing)墊(dian)(dian)(dian)(dian)片(pian)(pian)適(shi)用的(de)(de)公稱壓(ya)力(li)為(wei)1.6~25.0MPa.

一、金屬(shu)齒形墊片型式、尺寸(cun)與公差

1. 型(xing)式與尺寸

公稱壓力PN為4.0MPa、6.3MPa、10.0MPa及16.0MPa的(de)(de)凹凸面(mian)管法蘭(lan)用金屬齒形(xing)墊(dian)片(pian)的(de)(de)形(xing)式如圖(tu)14-2所示，尺寸見表14-6。

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