8月话题一：缸盖的缺陷与维修
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 39pt; TEXT-INDENT: -18pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly; mso-list: l0 level2 lfo1; tab-stops: list 39.0pt"><SPAN lang=EN-US style="FONT-SIZE: 12pt">1、</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">缸盖的缺陷及产生原因</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P><TABLE style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN-LEFT: 21pt; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-alt: solid windowtext .5pt" cellSpacing=0 cellPadding=0 border=1>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly"><B><SPAN style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">气门落座的拍击压力与接触面宽度</SPAN></B><SPAN lang=EN-US style="FONT-SIZE: 12pt">{</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（硬化层的形成是在一定的压强下由气门落座时的拍击，促使表层金属晶格变形产生变形应力而生成的）为延长气门及气门座的使用寿命，必须保证接触锥面的宽度和气门头下沉量以及气门弹簧的弹力等在规定范围内</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt">}<o:p></o:p></SPAN></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN lang=EN-US style="FONT-SIZE: 12pt">1、</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">过窄：易造成气门头起槽；散热不良而加速接触面的高温氧化、变形、漏气及烧损</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN lang=EN-US style="FONT-SIZE: 12pt">2、</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">过宽：接触时压强不够，不足以产生表面硬化层，耐磨性降低</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly; mso-list: l1 level1 lfo2; tab-stops: list 18.0pt"><SPAN lang=EN-US style="FONT-SIZE: 12pt">3、</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">落座压力还和转速、气门间隙、气门弹簧的弹力等因素有关</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></TD></TR>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly"><B><SPAN style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">排气门座锥面的麻点、烧蚀与锥面的宽度</SPAN></B><B><SPAN lang=EN-US style="FONT-SIZE: 12pt; COLOR: red"><o:p></o:p></SPAN></B></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在一定的宽度范围内麻点很少甚至就不发生，但超过某一值时就容易出现且数量多</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></P></TD></TR>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly"><B><SPAN style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">气门头厚度不够对气门及座磨损的影响</SPAN></B><B><SPAN lang=EN-US style="FONT-SIZE: 12pt; COLOR: red"><o:p></o:p></SPAN></B></P></TD>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 21pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly"><SPAN lang=EN-US style="FONT-SIZE: 12pt">2</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、缸盖平面变形的修整</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 21pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">较小：可以用平面刮刀或锉刀进行修整；</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 21pt; LINE-HEIGHT: 20pt; mso-line-height-rule: exactly"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">较大：平面磨床上磨平（但量应尽量小），大于</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt">0.5mm</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时应先将缸盖进行热校后再磨削</SPAN><SPAN lang=EN-US style="FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
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