1. 真空无模成型。真空无模成型进程，将片材加热到所需温度后，置于夹持环上，用压环压紧，翻开真空泵阀门抽真空，经过光电管控制真空阀调理真空度，直到片材到达所需的成型深度停止。因为自由真空成型法中制件不触摸任何模具外表，制件外表光泽度高，不带任何瑕疵。假如塑料本本身是通明的，制件能够具有最小的光吸收率和通明性，故可用于制作飞机部件如仪器罩和天窗等。
1 vacuum dieless forming. Vacuum forming process, to a required temperature after heating sheet, clamping ring in, with pressure clamping ring, open the vacuum pump vacuum valve, vacuum valve control through photoelectric tube vacuum conditioning, until the sheet forming depth required to stop. Because the free vacuum forming method of the product does not touch any mold surface, the appearance of high gloss, without any defects. If the plastic itself is brightly lit, the product can have a minimum light absorption and light, it can be used for the production of aircraft components such as instrument covers and skylights, etc..
真空无模成型法在成型进程中只能改动制件的拉伸程度和外廓形状，因而不能成型外型杂乱的制件。另外，成型进程中，随着拉伸程度的增大，最大变形区（即片材中心）的厚度不断减小，因而实践出产中拉伸比（H/D）通常应小于75%。
Vacuum forming method in the forming process can only change parts of the degree of tension and outline shape, which can shape the messy parts. In addition, in the process of forming, with the increase of the stretching degree, the thickness of the maximum deformation zone (i.e., the center of the sheet) decreases, so that the ratio of H/D in practice is usually less than 75%.
在运用此法进行加工时，操作员必须有娴熟的窍门，调理好真空度，以得到契合规划请求的概括和尺寸共同的商品。
In the use of this method for processing, the operator must have a knack for skilled, vacuum conditioning, in order to meet the requirements of the general plan and the size of the common commodity.
2. 真空阴模成型。真空阴模成型进程如图所示。真空阴成型法出产的成品与模腔壁贴合的一面质量较高，构造上也对比明显详尽，壁厚的最大部位在模腔底部，最薄部位在模腔旁边面与底面的接壤处，并且随模腔深度的增大成品底部转角处的壁就变得更薄。因而真空阴模成型法不适于出产深度很大的成品。
2 vacuum molding. Vacuum molding process as shown in figure. The product and mold wall joint produced vacuum forming method of high quality Yin side, the structure is also obvious contrast in detail, the wall thickness of the largest position in the cavity at the bottom of the thinnest parts in the mold cavity near the surface and the bottom surface of the border, and with the increase of cavity depth at the bottom corner of the finished wall becomes more thin. Thus the vacuum molding method is not suitable for the production of large depth of finished products.
3. 真空阳模成型。真空阳模成型工艺进程。本法关于制作壁厚和深度较大的成品对比有利。成品的首要特点是：与真空阴模成型法相同，模腔壁贴合的一面质量较高，构造上也对比明显详尽。壁厚的最大部位在阳模的顶部，而最薄部位在阳模旁边面与底面的接壤区，该部位也是最终成型的部位，成品旁边面常会呈现牵伸和冷却的条纹，形成条纹的因素在于片材各有些贴合模面的时分有先后之分。先与模面触摸的有些先被模具冷却，而在后继的相关进程中，其牵伸做法较未冷却的部位弱。这种条纹通常在挨近模面顶部的旁边面处最高。
3 vacuum forming mold. The vacuum mold molding process. This method is advantageous to the production of the wall thickness and the depth of the larger finished products. The main characteristics of the finished product is: the same as the vacuum molding method, the cavity wall of the side of the high quality, the structure is also more obvious contrast. The wall thickness of the largest position in the top of the mold, and the thinnest part in the male side surface and the bottom surface of the border area, the site is also the final shape of the finished parts, side surface often appears stretching and cooling stripes, stripes form factor is the sheet die surface when there is some attached priority. Some of the first contact with the mold surface is cooled by the mold, and in the subsequent related processes, the drafting of the cooling part of the weak. The stripes are usually highest near the top of the die face.
 

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