间接RP铸型制造工艺流程
发布时间：2020-04-16 11:34
<section><strong style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(123, 12, 0);"><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2.1</span><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">间接</span><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">铸型制造工艺流程</span></span></strong></section><p></p><section><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); font-family: 宋体; font-size: 14px; letter-spacing: 0pt; text-align: justify; text-indent: 31pt;">在铸造生产中，模板、芯盒、压蜡型、压铸型的制造往往是用机 加工的方法来完成的，有时还需要钳工进行修整，不仅周期长，耗资 大，而且从模具设计到加工制造是一个多环节的复杂过程，略有失误 就会造成很大的问题，甚至要全部返工。特别是对一些形状复杂的铸 件，如叶片、叶轮、发动机缸体、缸盖等，模具的制造更是一个难度 相当大的问题，即使采用数控加工，在加工技术与工艺可行性方面仍 有很大的困难和限制。因此这类零件的试制或小批量生产，制造周期 较长，成本较高，风险较大。如何快速完成铸造模具的设计和制造成 为铸造技术中的重要问题。</span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; text-indent: 31pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">快速成形技术与精密铸造技术相结合，为铸造模具快速设计与制 造提供了新途径，将大大提高铸造生产的柔性。所谓间接</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; text-indent: 31pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; text-indent: 31pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">铸型制 造，是指采用</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; text-indent: 31pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; text-indent: 31pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">工艺方法完成铸造模具的制造，经各种转换工艺而 完成铸型的生产，其工艺流程如图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; text-indent: 31pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">2-1</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; text-indent: 31pt; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">所示。</span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-size: 14px;"><br/></span></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1tia9CyiaPl1m25f9ibQMCXFfeW2qDYtz9aibbvVuCZEZ9BrpgCkAcNL4mPA/640?wx_fmt=png"/></section><section><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体; font-size: 14px;">图2-1间接RP铸型制造流程图</span></section><section><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体; font-size: 14px;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(123, 12, 0);"><strong style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2.1.1</span><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">硅胶软模</span></strong></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(123, 12, 0);"><strong style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"><br/></span></strong></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">在图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-1</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">中提出了硅胶软模作为过渡模的概念。如果</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">原型比 较复杂，存在许多精细结构，则须将</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">原型转换成硅胶软模，又称 硅橡胶型或硅胶型（模具）。由于硅胶与</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 41px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">原型间的摩擦因数很小</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">且硅胶具有弹性，可很方便地完成此转换工序；由于同样的原因，从 硅胶型翻制成精密铸型，精密铸型与硅胶型易于分离且不会损伤细小 结构。如</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">模具结构简单则无需经过硅胶型转换。</span></section><section><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); font-family: 宋体; font-size: 14px; letter-spacing: 0pt; text-indent: 0pt;"><br/></span></section><section><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); font-family: 宋体; font-size: 14px; letter-spacing: 0pt; text-indent: 0pt;">多种RP工艺制造的原型均可 作为铸造模具使用，如FDM (MEM ), SL, LOM 等。其中 LOM工艺可以制造尺寸比较大的 原型，适合于制造大型铸造模具。图2-2为汽车发动机铸造用芯盒。</span></section><section><span style="margin: 0px; padding: 0px; text-indent: 0pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-size: 14px;"><br/></span></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1to944woNr1Dz3YC5JCCJgKgdqOSpZg5hH4W9BLTaPVlpfM9XpcGoKkw/640?wx_fmt=png"/></section><section><span style="margin: 0px; padding: 0px; font-size: 12px;"><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">图</span><span style="margin: 0px; padding: 0px; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">2-2 LOM%</span><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">艺制造的铸造用芯盒</span></span><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); font-family: 宋体; font-size: 12px; letter-spacing: 0pt; text-indent: 30pt;">原型(北京殷华公司提供)</span></section><section><br/></section><section><span style="margin: 0px; padding: 0px; text-indent: 30pt; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">LOM</span><span style="margin: 0px; padding: 0px; text-indent: 30pt; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">原型的表面质量直接影响翻制的硅橡胶模具、石膏型和精</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">密铸型的表面质量。采用打磨前后的</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">原型，翻制硅橡胶模具、石膏 型和精密铸型，测量其表面粗糙度分别如图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-3</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">、图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-4</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">、图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-5</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">和图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2- 6</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">所示。</span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><br/></section><section><img class="rich_pages js_insertlocalimg" src="https://mmbiz.qpic.cn/mmbiz_jpg/TCIDp9rFWaY7c52x5xSibvcNZTod34W1tdn2G7t8uMe7TCyHmic8lMIhmTticxLz4KEpiaBZN51npXibNJDIKXCzRtg/640?wx_fmt=jpeg"/></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1tRDS3soNx7Dn4WtYsknlSsDeIWNesCPawIiczuAuNkYWtjACdRWUfXwA/640?wx_fmt=png"/></section><section><br/></section><section><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); font-family: 宋体; font-size: 14px; letter-spacing: 0pt; text-indent: 29pt;">硅橡胶软模的材料特性和制模工艺对铸型的尺寸精度与表面质量 的影响也很大，主要是由于不同种类的硅橡胶存在不同的收缩率，在 不同的固化温度下收缩率不同。采用硅橡胶真空制模工艺将会提高硅 胶模具的复制性能和表面质量。</span><br/></section><section><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); font-family: 宋体; font-size: 14px; letter-spacing: 0pt; text-indent: 29pt;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px;"><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;"><span style="margin: 0px; padding: 0px;">转换方法、造型材料、造型工艺将直接影响铸型的尺寸精度和表</span> <span style="margin: 0px; padding: 0px;">面质量。工艺转换对表面粗糙度的影响如图</span></span><span style="margin: 0px; padding: 0px; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">2-7</span><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;"><span style="margin: 0px; padding: 0px;">所示，不同的转换工</span> <span style="margin: 0px; padding: 0px;">艺所能达到的尺寸精度如表</span></span><span style="margin: 0px; padding: 0px; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">2-1</span><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">所示。</span></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px;"><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"><br/></span></span></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1tmv7nLBANMpt0SmStYSPvtyd4YPmwrE9EvrLpqzy1MxfWAc7wicfa2mw/640?wx_fmt=png"/></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1tUt9CInsMrJeExoAwZUxF4bo0wiaDmWnOsSqhib9I0GxahJPI7BR343Pw/640?wx_fmt=png"/></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1t1YZOnd1pCGSA0rMfFrYdh4ibIMCG5r14XzUutL0z0CB7MYX1TmkTTXQ/640?wx_fmt=png"/></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1teDQ9HooYZT9akfv2XuQKE9NWQ3TshkZKRKFheFesvibricgWCcTQtBZw/640?wx_fmt=png"/></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1tvljLxUNImk4wzTmShmg8Jqr7URtic9mia1HWPwx3r8K0OyiacR7Xj4GjQ/640?wx_fmt=png"/></section><section><br/></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(123, 12, 0);"><strong style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; font-family: "Times New Roman"; letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">2.1.2</span><span style="margin: 0px; padding: 0px; letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">硅胶软模制模工艺</span></strong></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">硅橡胶因其具有很好的柔软性、弹性、分型性和复形（型）性 能，可很好地将原型的复杂曲面复制下来，具有合适的硬度和固化时 间。硅胶模广泛用于快速制造小批量塑料零件，其主要优点是成本 低，工艺简单，尺寸精度高，速度快，任意复杂形状的模具如型腔形 状复杂、花纹细腻、起模斜度极小，甚至无起模斜度的情况下，都可 以采用。将</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">原型转制为硅胶模，再由硅胶模作为母模翻制铸型, 用作注塑模时其寿命一般为</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">200</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">件以下。</span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><strong style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(123, 12, 0);"><span style="margin: 0px; padding: 0px; font-family: "Times New Roman"; letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">2.1.2.1</span><span style="margin: 0px; padding: 0px; letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">硅橡胶模具制造工艺流程</span></span></strong></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">硅橡胶模具制造流程如图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">2-8</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">所示。首先，将经表面处理后的原 型，悬挂在敞口的箱体内（箱体的内轮廓尺寸为</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">原型轮廓最大尺 寸基础上增加</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">20 ~ 30mm）</span><sub style="margin: 0px; padding: 0px; text-indent: 29pt;"><span style="margin: 0px; padding: 0px; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; vertical-align: sub;">o</span></sub><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">在</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: "Times New Roman"; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 29pt; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal;">原型和箱体内侧均匀涂抹分型剂 （一般使用凡士林）。</span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0pt; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><br/></section><p></p><p style="margin: 0pt; padding: 0px; clear: both; color: rgb(51, 51, 51); font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; text-align: justify; white-space: normal; text-indent: 29pt; line-height: 22.9pt;"><br/></p><p></p><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1trwaW3PhtpBgna2CbVKiblO6r6mR82N8E0o674hNJmcj8LRLaNq4zepA/640?wx_fmt=png"/></section><section><span style="margin: 0px; padding: 0px; text-align: left; text-indent: 37px; font-size: 14px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;"><br/></span></section><section><span style="margin: 0px; padding: 0px; text-indent: 37px; font-size: 14px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">其次，计算箱体的体积和原型的体积，计算岀所需要硅橡胶的体 积，按一定比例称取硅橡胶主剂和固化剂，混合搅拌后，在真空中除 气 </span><span style="margin: 0px; padding: 0px; text-indent: 37px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2 ~ 3min。</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 43px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">然后，将混合好的硅橡胶浇入到箱体内，并真空除气</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 43px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">5-lOmin, </span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 43px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">以除去浇注过程中卷入的气体。</span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">经室温固化</span><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">10~14h,</span><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">起出</span><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-size: 14px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">原型，即可得到硅橡胶模具。开 模的方式一般需要考虑随后零件的浇注要求。零件越复杂，开模面越 复杂。</span><br/></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-size: 14px;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px;"><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;"><span style="margin: 0px; padding: 0px;">由于液态硅胶粘度很大，流动性差，在与催化剂混合、搅拌之后，</span> <span style="margin: 0px; padding: 0px;">会有大量的气泡存在于胶料中，难以排除，真空除气的主要目的在于</span> <span style="margin: 0px; padding: 0px;">排除这些气体；而且灌注硅胶时难免会卷入部分气体，这部分气体会</span> <span style="margin: 0px; padding: 0px;">以气泡的形式滞留于胶料中；同时，若存在于胶料中的气泡与</span></span><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;"><span style="margin: 0px; padding: 0px;">原型</span> <span style="margin: 0px; padding: 0px;">相接触，就会吸附在</span></span><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">RP</span><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;"><span style="margin: 0px; padding: 0px;">原型表面，导致硅胶模的型腔表面岀现气孔。</span> <span style="margin: 0px; padding: 0px;">因此，为确保硅胶模的质量，必须使用真空搅拌和脱气</span>(除气)。</span></span></section><section><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-size: 14px;"><br/></span></section><section><span style="margin: 0px; padding: 0px; color: rgb(123, 12, 0);"><strong style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; font-size: 14px;"><span style="margin: 0px; padding: 0px; line-height: 21px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2.1.2.2</span><span style="margin: 0px; padding: 0px; letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">硅橡胶材料选择</span></span></strong></span><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px;"><strong style="margin: 0px; padding: 0px;"><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"><br/></span></strong></span></section><section><span style="margin: 0px; padding: 0px; font-size: 14px;"><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;"><span style="margin: 0px; padding: 0px;">硅胶模通常采用室温固化硅橡胶作为模具材料。室温固化硅橡胶</span> <span style="margin: 0px; padding: 0px;">具有如下一些优点：温度稳定性好</span>(耐高、低温)；耐臭氧和氧老化、 耐光老化等性能；吸湿性低，不与其他材料粘合，具有良好的生理惰 性；高透气性。因此硅胶模作为中间转换模不会对铸件的最终质量产 生影响。用作硅橡胶模具的硅胶材料要求具有较短的固化时间，较高 的强度和硬度，较强的抗撕裂性能，线收缩率越小越好且硅橡胶不能 与酸碱反应。对市场上销售的硅橡胶材料的性能进行了对比，结果如表</span><span style="margin: 0px; padding: 0px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-2</span><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">所示。</span></span></section><section><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-size: 14px;"><br/></span></section><section><span style="margin: 0px; padding: 0px; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-size: 14px;"></span></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1t41kj1WFhyBuSeSPqx5bFVubriaKk1AJuDs8p0bD9zSc6NujTmcXIcrw/640?wx_fmt=png"/></section><section><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0em; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"><br/></span></section><p></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; clear: both; color: rgb(51, 51, 51); font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; text-indent: 0em; white-space: normal; line-height: 1.75em;"><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0em; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">从表</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0em; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-2</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0em; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">可以看出，为了提高零件的精度，应该选择</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0em; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">T-2</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-indent: 0em; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">和</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">Silastic S</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">型硅橡胶。对于形状复杂、起模难度大的零件，应该选择硬 度低的硅胶。</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">Dow Corning</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">公司的</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">T-2</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">硅橡胶的操作时间、凝固时间 与环境温度关系分别如图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-9</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">、图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-10</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;">所示。图</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">2-11</span><span style="margin: 0px; padding: 0px; font-size: 14px; text-align: justify; font-family: 宋体; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal;">是采用硅胶注 模技术制造的零件。</span></p><p></p><section><span style="margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); letter-spacing: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-family: 宋体;"></span></section><section><br/></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1th9DRYL5ayiaKWATIzUcibnOEJE2xYWQF9YIUzItsuoIQ7uNy5xdKpHbg/640?wx_fmt=png"/></section><section><img class="rich_pages" src="https://mmbiz.qpic.cn/mmbiz_png/TCIDp9rFWaY7c52x5xSibvcNZTod34W1trXsdsicUuRceGnsqLm6dW2A4HLcfXia7sBibjXGo5EwNRKicf4JXWBqexA/640?wx_fmt=png"/></section><p></p><p><br/></p>
