Vacuum Casting on demand parts

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Vacuum Casting on Demand Parts: Urethane Casting

Urethane casting, also known as vacuum casting, is a process that provides end-use rigid plastic parts or rubber parts with production-level quality. This method eliminates the need for expensive and time-consuming hard tooling. Instead, it utilizes a 3D printed master pattern and silicone molds to deliver high-quality, short-run parts.

The finished dimensions of urethane cast parts depend on the accuracy of the master model, part geometry, and casting material. Generally, a shrinkage rate of +0.15% is expected. Urethane cast parts are commonly used when color, surface quality, and toughness are required. This process is a suitable alternative for insert molding or over molding in low volumes, offering a diverse range of material choices.

Polyurethane casting can also serve as a bridge-tooling method between a 3D printed rapid prototype and an injection molding process. It provides a balance of quality, cost, and time. Urethane cast parts can be clear, color-matched, painted (including EMI shielding), have installed inserts, and even receive custom finishes.

Materials for urethane casting are often compared to injection molding materials. Different categories include ABS-Like, Polycarbonate-Like, Glass-Filled Nylon-Like, Rubber-Like Polyurethane, and Clear Rubber-Like Polyurethane. Each category offers unique characteristics and technical qualities.

When it comes to tolerances, urethane cast parts typically have a distance dimension tolerance of +/- 0.010" or +/- 0.003" per inch, whichever is larger. Shrinkage mitigation is a factor, with a rate of +0.15% due to thermal expansion of the liquid and the response of the flexible mold. Surface quality is externally smoothed to a satin or matte surface, with possible grow lines on internal or difficult-to-access features. Feature definition may appear slightly rounded, while urethane cast parts can be as large as 30" long.

The surface finish options for urethane cast parts include Clear, Matte/Frosted, Semi-Gloss, High-Gloss, and Custom finishes. Each finish has its own characteristics, such as transparency, sheen, and cleanability.

Urethane casting has various applications, including low-volume production, advanced prototyping, and market testing. It is an ideal choice for low-quantity production and offers the flexibility to incorporate design changes easily. Urethane cast parts are also suitable for consumer testing, user evaluation, and concept models.

FAQ:

1. What is the advantage of urethane casting over traditional injection molding?
2. Can urethane cast parts be color-matched to specific requirements?
3. How do I determine the appropriate material category for my project?
4. Can urethane cast parts be painted or have EMI shielding?
5. What is the maximum size of urethane cast parts?

Other Products:

Ever-Power Group specializes in supplying various cast iron products used in the industry. Our range includes Grey Cast Iron, Ductile Cast Iron, Alloy Steel Casting, Stainless Steel Casting, Carbon Steel Casting, Corrosion Resistant Steel Casting, Aluminum Pressure Die Casting, Aluminum Gravity Die Casting, Aluminum Sand Casting, Aluminium Alloy Casting, Refractory Steel Casting, Copper alloy casting, Zinc alloy casting, Sand Casting, and Green Sand Casting. We offer high-quality products, competitive prices, and excellent customer service. Customization based on drawings or samples is also available.