<p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><strong quot;mso-bidi-font-weight: normal;"><span quot;text-decoration: underline;"><span quot;color: blue; mso-bidi-font-size: 10.5pt;" lang="EN-US"><a href="//www.bthxzw.com/"><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";" lang="EN-US"><span lang="EN-US"><span quot;font-size: small; color: #000080;">地轨</span></span></span></a></span></span></strong><span quot;font-size: small;"><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">产</span><span quot;mso-bidi-font-size: 10.5pt;"> </span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">品</span><span quot;mso-bidi-font-size: 10.5pt;"> </span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">说</span><span quot;mso-bidi-font-size: 10.5pt;"> </span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">明</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"><span quot;mso-spacerun: yes;">  </span></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">1</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">、灰铸铁件标准：</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">GB9439</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">—</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">88</span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">2</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">、灰铸铁件的特点：</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"><span quot;mso-spacerun: yes;">  </span>(1)</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">耐磨性与消震性好。由于铸铁中石墨有利于润滑及贮油，所以耐磨性好。同样，由于石墨的存在，灰口铸铁的消震性优于钢。</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"><span quot;mso-spacerun: yes;">  </span>(2)</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">工艺性能好。由于灰口铸铁含碳量高，接近于共晶成分，故熔点比较低，流动性良好，收缩率小，因此适宜于铸造结构复杂或薄壁铸件。另外，由于石墨使切削加工时易于形成断屑，所以灰口铸铁的可切削加工性优于钢。</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">3</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">、硬度和抗拉强度之间的关系：灰铸铁的硬度和抗拉强度之间，存在一定的对应关系，其经验关系式为：</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">a</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">、当</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">O</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">≥</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">196N/mm</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">㎡时</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"><span quot;mso-spacerun: yes;">    </span>HB=RH(</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">飞</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">00+0 4380b)<span quot;mso-spacerun: yes;">  </span>(B1)</span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">b</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">、当</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">0</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">≥</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">796N/mm</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">㎡时</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"><span quot;font-size: small;"><span quot;mso-spacerun: yes;">    </span>HB=RH<span quot;mso-spacerun: yes;">  </span>(44+O 7240b)<span quot;mso-spacerun: yes;">  </span>(B2)</span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"><span quot;mso-spacerun: yes;">    </span></span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">式中相对硬度</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">(RH)</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">值主要由原材料、熔化工艺、处理工艺及铸件的冷却速度所确定。</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">4</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">、利用树脂砂型铸造机床床身铸件的优点</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">1</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">树脂砂型刚度好，浇注初期砂型强度高这就有条件利用铸铁凝固过程的石墨化膨胀，有效地清理缩孔、缩松缺点，实现灰铸铁、球墨铸铁件的少冒口、无冒口铸造。</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">2</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">实型铸造生产中采用聚苯乙烯泡塑模样应用呋哺树脂自硬砂造型。当金属液浇入铸型时，泡沫塑料模样在高温金属液作用下迅速气化，燃烧而消失，金属液取代了原来泡沫塑料所占据的位置，冷却凝固成与模样形状相同的实型铸件。</span><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span quot;mso-bidi-font-size: 10.5pt;" lang="EN-US">3</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt;">相对来说，消失模铸造对于生产单件或小批量的汽车覆盖件，机床床身等大型模具较之传统砂型有很大优势，它不但省去了昂贵的木型费用，而且便于操作，缩短了生产周期，提高了生产效率，具有尺寸精度高，加工余量小，表面质量好等优势。</span><span lang="EN-US"> </span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span lang="EN-US"><span quot;font-size: small;"> </span></span></p> <p class="MsoNormal" quot;margin: 0cm 0cm 0pt;"><span quot;font-size: small;"><span lang="EN-US"><span quot;mso-spacerun: yes;"> </span><strong quot;mso-bidi-font-weight: normal;"><span quot;text-decoration: underline;"><span quot;color: blue;"><a href="//www.bthxzw.com/"><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";" lang="EN-US"><span lang="EN-US"><span quot;color: #000080;">地轨</span></span></span></a></span></span></strong></span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的用途：根据设备的固定点来设计、拼接成铸梁平台，主要用于大型设备的装配、试验、焊接和检验</span><span lang="EN-US">.</span><span quot;font-family: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">。</span></span></p>