Gas-Assist Mold Manufacturer

Gas Assist Injection Molding: Not just for hollow parts

材料少。重量较小。成本较小。更好的质量。

Gas assist injection molding offers a variety of process and design advantages for Outdoor Power Equipment and Medical Equipment application. It involves the injection of a short shot of resin into the cavity and follows by injection of nitrogen gas under high pressure through the nozzle or mold wall. Nitrogen is the ideal gas for the job because it is an inert, dry and non-toxic gas and melts at a high temperature while preventing oxidation. During this process, after the polymer is injected into the mold, a skin layer next to the mold begins to solidify, but the inner core remains molten. Injected gas displaces the polymer from the core region and forces it into mold extremities. As the polymer cools, the gas pressure continues to force it against the cavity wall, helping prevent volumetric shrinkage of the part.

Gas Assist injection molding produces parts that are smooth and extremely cleanable, while offering increased strength and rigidity, weight reduction, design flexibility, and improved surface finish. Gas assist may also lower production costs by reducing cycle time compared with producing solid sections.

Gas-Assist Plastic Design

Gas-Assist Injection Mold Design

Gas-Assist Mold Manufacturing

天然气辅助注入成型

燃气辅助注入型类型

由于其可用性，成本和惰性，氮通常用于外部和内部气体辅助成型。

外气辅助成型

在外部气体辅助注射型施用中，将气体用于外表面，入口和通道被纳入零件设计和注入模具中。在成型过程中，专门的喷嘴将加压气体引入熔融塑料中。这有助于将树脂推向模具的最远，并难以到达零件的部分。外部气体辅助用于增强表面定义。

Lawn Mover Part的示例，该部分是使用气体辅助注入成型产生的。它使我们能够在使用低压造型的同时获得吸引人的外观。燃气通道的位置可以在零件的隐藏背面看到。

Internal gas assist molding

内部气体辅助注入成型是一种低压，常规的注入成型工艺，它将加压氮气注入熔融材料的短镜头内部。气体通过形成空心截面来置于策略性设计和放置的气通道的战略性设计和放置的气通道，该路径最小阻力，可将材料置于零件厚区域的厚度。此过程减少了材料的用法，但不会损害零件的外观和功能性能。接下来，加压气体包装并将熔融树脂固定在腔壁上，直到该部分固化为止。恒定的气压有助于在零件开始冷却并从模具中弹出之前，防止零件缩小。一旦部分固化，气体就会从工具中排出。

燃气辅助注射材料

Most thermoplastic materials are capable of being used in gas assist application, including ABS, PC/ABS, Acetal, PC, PPO, PBT, PET, PA, PVC, HIPS, PP, and HDPE. PC+ABS and PC are more rigid and look attractive when painted. They have a great finish and solid feel, but of course are much lighter. PA is frequently used for canoe paddles due to its overall ruggedness, while handles for many applications are made out of PC or PBT.

Gas Assist Design Considerations

为气体辅助注入成型的优化零件设计应集中于通道布局优化，相对于零件的通道尺寸并平衡塑料填充图案。
切勿将两个熔体前部汇合在一起形成焊接线的气通道。
Make runners and injection points slightly larger than those for conventional injection molding
确保模具墙均匀加热和冷却
Sharp corners create thinwall sections so it may be advantageous to cool the mold separately in these locations
It’s imperative to exactly balance melt flow into the cavities of multicavity tools
腔应对称地排列在模具中，每个腔都应具有自己的独立煤气针头

您想了解更多有关气体辅助注入成型的信息吗？与Stebro Mold的专家交谈。我们在这里回答您的问题并协助您任何生产需求。

煤气辅助注入模具制造

加快模具制造过程sacrificing quality, you need the right technology. We use UG to design and manufacture molds. The 2K Mould manufacturing was done toally according to the 3D mold design. For manufacturing the 2K mold, we use different manufacturing machines such as Mikron CNC, AgieCharmiles EDM, Sodick Slow Wire Cut machine, Grinding Machine and Gun Drill Machine. After machining all the components, we have to measure the key size on the CMM machine. It is very important to avoid flash at the parting surface.

气体辅助注入成型的优势和应用

气体辅助注入成型的优势

增加零件集成的可能性
允许塑料在给定的模具中均匀有效。
Reduce sinks and molded-in partstress, especially in parts that have thick-walls and/or flat surface areas with opposing ribs, post, or other engineered structures.
较低的夹具吨位需求和较低的成型压力，因此延长了工具的寿命，并在经济上更经济和改进的化妆品生产更大的零件。
Greater design freedom, allow engineers to develop thin-walled components and thick but hollow portions to thin-walled products.
较短的循环时间并增加塑料注塑机的输出。
减轻零件重量