低压灌注是适用于快速成型厂家的一项手板制作工艺，它将聚氨酯材料经混合后，在常温、低压环境下注入快速模具内，通过材料的聚合、交联、固化等化学和物理过程形成制品。低压灌注适用于产品开发过程中的小批量制作，以及结构较简单的覆盖件和大型厚壁及不均匀壁厚制品的生产。

Low pressure injection is a prototype manufacturing process suitable for rapid prototyping manufacturers. It mixes polyurethane materials and injects them into rapid molds at room temperature and low pressure, forming products through chemical and physical processes such as material polymerization, cross-linking, and curing. Low pressure injection is suitable for small batch production in the product development process, as well as the production of structurally simple coverings and large thick and uneven wall thickness products.

低压灌注利用汽车手板原型制作简易模具，这种工艺制作的制件可以大到汽车保险杠与医疗台车大小的制品，适用数量适合在15-2000套之间。在汽车RIM低压灌注领域，比如保险杠、翼子板、方向盘、、仪表板、进气格栅、门板、 前端模块、气囊盖等汽车内外饰，思骏达手板厂积累了大量生产心得与技术方法。

Low pressure injection utilizes automotive prototype production to create simple molds. This process can produce products as large as car bumpers and medical carts, with a suitable quantity ranging from 15-2000 sets. In the field of automotive RIM low-pressure injection, such as bumpers, fenders, steering wheels, instrument panels, air intake grilles, door panels, front end modules, airbag covers, and other automotive interior and exterior decorations, Sijunda Hand Panel Factory has accumulated a large amount of production experience and technical methods.

低压灌注工艺流程：单体或预聚物以液体状态经计量泵以一定的配比进入混合头进行混合。混合物注入模具后，在模具内快速反应并交联固化，脱模后即为RIM制品。

Low pressure infusion process flow: Monomers or prepolymers enter the mixing head in a liquid state through a metering pump in a certain proportion for mixing. After the mixture is injected into the mold, it quickly reacts and crosslinks within the mold, and after demolding, it becomes the RIM product.

低压灌注成型具有如下特点：

Low pressure injection molding has the following characteristics:

低压灌注成型过程过程不仅由动力学和热力学所决定，也受物理条件影响；

The process of low-pressure injection molding is not only determined by dynamics and thermodynamics, but also influenced by physical conditions;

材料固化时间较长，且材料的固化和冷却占用了绝大部分时间；

The curing time of the material is relatively long, and the curing and cooling of the material occupy the vast majority of the time;

成型后的材料具有热固性性质；

The formed material has thermosetting properties;

加工在低压下进行，因此仅适用于产品结构较简单的快速成型。

The processing is carried out under low pressure, so it is only suitable for rapid prototyping with simpler product structures.

低压灌注成型使用的材料主要以聚氨酯材料为主，通过改变材料的混合比例，可获得不同的材料弹性模量，从而得到所需要的材料特性。固化后的材料物理性能类似于ABS、PP或PS。此工艺适合于较大壁厚及不均匀壁厚手板产品的生产。

The materials used in low-pressure injection molding are mainly polyurethane materials. By changing the mixing ratio of the materials, different material elastic moduli can be obtained to obtain the required material properties. The physical properties of the cured material are similar to ABS, PP, or PS. This process is suitable for the production of hand board products with larger wall thickness and uneven wall thickness.