Reaction Injection Molding Automotive Parts Rapid Prototypes To Low Volume Production Quickly And Cheaply

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) is an innovative manufacturing process used to produce the large and complex plastic parts with high flexibility, strength and durability. RIM involves the mixing of liquid bi-component polyurethanes in a mixer at certain amount ratio, then injecting the liquid mixture at room temperature and low pressure into mold cavity where the mixture reacts and cures into a solid part.

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.

The high pressures used cause the plastic to conform to the mold’s shape, thereby generating the part. Like metal die casting, custom plastic injection molding typically produces components that require little or no additional work. Reaction Injection Molding (RIM) is a specialized subset of the injection molding technique that chemically bonds two or more plastics into a polymer before they are introduced into the mold.

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.

We are respected in RIM industry in China, the RIM service we send out to global market are quick, economical and quality that are proven by the customers used our service, especially from automobile field. We look forward to doing more and better by our continuously improving RIM expertise and experience.

Advantages of RIM Parts:

Thick and Various wall thickness for one part

Excellent mechanical properties

High flexibility, strength and durability

Good chemical resistance

Great impact resistance

Excellent dimensional stability

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.