管螺纹的选择和强度计算
要选择一个管螺纹，不了解什么是管螺纹 <p>管螺纹：顾名思义就是管子上用的螺纹。主要作用是密封，使管内（外）介质不渗漏。其螺纹牙形是55度的，分圆柱管螺纹和圆锥管螺纹，用英制表示管子内径，实际螺纹外径大于管子内径。</p><p>详细内容查一查机械手册就都有了。</p> <p>错!管螺纹有两种一种是螺纹密封用管螺纹，一种是非螺纹密封用管螺纹</p><p>这是书上的原话</p> <table cellspacing="0" cellpadding="0" width="936" border="0" style="WIDTH: 702pt; BORDER-COLLAPSE: collapse;"><colgroup><col span="13" width="72" style="WIDTH: 54pt;"></col></colgroup><tbody><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl24" width="936" colspan="13" height="20" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent;"><font face="Arial"><font color="#ff0000">NPT</font><font class="font5">，</font><font class="font7" color="#ff0000">PT</font><font class="font5">，</font><font class="font7" color="#ff0000">G</font><font class="font5"> </font><font class="font6"><strong>都是管螺纹．</strong></font></font></td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl24" width="936" colspan="13" height="20" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent;"><font face="Arial"><font color="#ff0000">NPT</font><font class="font5"> 是 National (American) Pipe Thread 的缩写，属于美国标准的 60 度锥管螺纹，用于北美地区．国家标准可查阅 </font><font class="font8" color="#ff0000"><strong>GB/T12716-1991</strong></font></font></td></tr><tr height="39" style="HEIGHT: 29.25pt; mso-height-source: userset;"><td class="xl24" width="936" colspan="13" height="39" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 29.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial"><font color="#ff0000">PT </font><font class="font5">是 Pipe Thread 的缩写，是 55 度密封圆锥管螺纹，属惠氏螺纹家族，多用于欧洲及英联邦国家．常用于水及煤气管行业，锥度规定为 1:16． 国家标准可查阅 </font><font class="font8" color="#ff0000"><strong>GB/T7306-2000</strong></font></font></td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl24" width="936" colspan="13" height="20" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent;"><font face="Arial"><font color="#ff0000">G</font><font class="font5"> 是 55 度非螺纹密封管螺纹，属惠氏螺纹家族．标记为 G 代表圆柱螺纹．国家标准可查阅 </font><font class="font8" color="#ff0000"><strong>GB/T7307-2001</strong></font></font></td></tr><tr height="38" style="HEIGHT: 28.5pt; mso-height-source: userset;"><td class="xl22" width="936" colspan="13" height="38" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 28.5pt; BACKGROUND-COLOR: transparent;"><font face="Arial">另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径，单位是英吋．行内人通常用分来称呼螺纹尺寸，一吋等于８分，1/4 吋就是２分，如此类推．G 就是管螺纹的统称(Guan)，55，60度的划分属于功能性的，俗称管圆。即螺纹由一圆柱面加工而成。</font></td></tr><tr height="19" style="HEIGHT: 14.25pt; mso-height-source: userset;"><td class="xl24" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial"><font color="#ff0000">ZG</font><font class="font5">俗称管锥，即螺纹由一圆锥面加工而成，一般的水管接头都是这样的，国标标注为Rc</font></font></td></tr><tr height="19" style="HEIGHT: 14.25pt; mso-height-source: userset;"><td class="xl24" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial"><font color="#ff0000">公制螺纹</font><font class="font5">用螺距来表示，美英制螺纹用每英寸内的螺纹牙数来表示，这是它们最大的区别，</font></font></td></tr><tr height="19" style="HEIGHT: 14.25pt; mso-height-source: userset;"><td class="xl22" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial">公制螺纹是60度等边牙型，英制螺纹是等腰55度牙型，美制螺纹60度。</font></td></tr><tr height="19" style="HEIGHT: 14.25pt; mso-height-source: userset;"><td class="xl22" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial">公制螺纹用公制单位， 美英制螺纹用英制单位。</font></td></tr><tr height="19" style="HEIGHT: 14.25pt; mso-height-source: userset;"><td class="xl22" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial">管螺纹主要用来进行管道的连接，其内外螺纹的配合紧密，有直管与锥管两种。公称直径是指所连接的管道直径，显然螺</font></td></tr><tr height="19" style="HEIGHT: 14.25pt; mso-height-source: userset;"><td class="xl22" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial">纹直径比公称直径大。</font></td></tr><tr height="19" style="HEIGHT: 14.25pt; mso-height-source: userset;"><td class="xl22" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"><font face="Arial">1/4，1/2，1/8是英制螺纹的公称直径，单位是英寸。</font></td></tr><tr height="19" style="HEIGHT: 14.25pt;"><td class="xl23" width="936" colspan="13" height="19" style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 702pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent;"></td></tr></tbody></table>
页:
[1]