Reaction Injection Molding RIM Rapid Car Bumper Prototypes Cheap Mold Fast Delivery Good Quality

Customer was an automotive design and engineering company in USA, wanted to test impact and high temperature resistance of this bumper by low volume rapid prototypes. Though customer was new to our RIM technique, found it was a proper and economical solution for this project.

Reaction Injection Molding (RIM, also named Low-Pressure Injection Molding) is an ideal process to low volume manufacturing the large plastic parts quickly and economically. Firstly, the liquid bi-component polyurethanes are injected into a mixer at certain amount ratio and meanwhile mixed well by the mixer, then the mixture is injected into the tooling cavity quickly at room temperature and low pressure to form the parts.

Reaction Injection Molding Process Steps:

Mixing: two liquid polyurethanes are mixed together in a mixer at certain amount ratio.

Injection: the mixed liquid polyurethanes are injected into mold cavity under low pressure and room temperature.

Reaction: The liquid mixture reacts and cures inside the mold cavity and forms a solid part.

Demolding: The solid part is manually taken out from the mold cavity.

One advantage of RIM is its ability to produce large parts with a smooth and high-quality surface finishing, as well as the complex geometries and intricate details. Another advantage of RIM is its ability to produce parts with high strength and durability, which makes RIM parts ideal for applications that durability is a critical factor, such as industries of automotive, medical devices, aerospace, etc.

The core advantage of our RIM process is the extremely competitive tooling cost, the disadvantage is the part price since costly material and surface finishing. Which means more big size of the part, more competitive the RIM tooling cost, this is why our RIM is very suitable for low volume manufacturing the large plastic parts, such as automobile bumpers, large housings, big covers, etc. Insert molding and overmolding are available for our RIM.

RIM Parts Design Considerations:
When designing parts for RIM production, it's important to consider factors such as size, structure, wall thickness, draft angles, and gating. RIM parts can be designed with complex geometries and intricate details, but it's important to ensure that the part design is manufacturable and the tooling favors the design.

The maximum weight by one shot of injection molding was 35 kilograms, so our RIM process was available for molding the vast majority of parts. Being different to injection molding by steel mold, our RIM had simple demolding system, and worked fine for insert molding and overmolding.

Industry Applications:
RIM is commonly used in the low volume manufacturing or prototyping of automotive, aerospace, medical devices, and consumer goods parts. Such as automotive bumpers & grills, body panels, interior components, aerospace ducting, large enclosures, big housings and medical covering shells.

Quality and Service are the true reasons that HONKIA survives and grows up in the market since our establishment. We saw some of our competitors are making money by playing around the quality and then lose the market faster than we think. We do know that is not a sustainable business pattern.

Due to the low injection molding temperatures and pressures, RIM is well-suited for molding large parts with variable wall thickness and smooth surface finishes. We can also benefit from its relatively high turnover rate, which makes it proficient in handling low to middle volume production projects. In addition, RIM parts have high tensile strength, heat resistance, and good resistance to corrosive acids or solvents. However, prolonged exposure to sunlight can degrade polymer-based parts.

How does HONKIA compare to other suppliers on price?

Compared to other Chinese suppliers, we choose not to compete on price but to offer the high level of quality, rapid response, and professional results. That’s why some customers cooperate with us for many years, compared with the price, they need a reliable partner to avoid serious losses caused by annoying after-sales service or even the trouble of finding no one.

What if I am not completely satisfied with the parts I receive?

HONKIA will free remake or amend the returned parts that you are not completely satisfied, or refund the full arrived payment, though this is rarely happened in the past. Any disputes based on a subjective or unilateral determination shall be discussed and negotiated to reach a reasonable result. Our continuing business relies on earning your confidence in our ability to meet and exceed the reasonable expectations.