Expert plastic injection molding solutions for custom prototypes and production parts. From concept to completion, TOUWEI delivers high-quality molded components with rapid turnaround times
Plastic injection molding is a manufacturing process used to produce plastic components by injecting molten polymer into a precision-machined mold cavity. The material cools and solidifies into the required shape, after which the part is ejected and the cycle repeats.
Because the mold defines the component’s geometry, injection molding can produce repeatable parts with complex features, integrated details, and consistent surface appearance. It is particularly suitable for applications where dimensional repeatability and production efficiency are important.
The process can be used for product housings, electronic enclosures, automotive components, connectors, gears, handles, and other custom plastic parts. Material selection and mold design depend on the component’s operating environment, load requirements, appearance, and intended production volume.
Compared with CNC machining and 3D printing, injection molding can offer a lower per-part cost at suitable production volumes. However, tooling requires an initial investment, so the best process depends on part complexity, quantity, development stage, and required lead time.
Custom plastic injection molding combines part design, material engineering, precision mold manufacturing, and controlled production. Each stage influences the final component’s dimensions, strength, appearance, and consistency.
1. CAD Review and Design for Manufacturability
2. Plastic Material Selection
3. Injection Mold Design and Manufacturing
4. Material Melting and Injection
5. Cooling, Solidification, and Ejection
6. Sample Inspection and Production Validation
7. Repeat Production and Quality Inspection
TUOWEI Precision makes it simple to move from rapid prototypes to full-scale production with high-quality, cost-effective plastic parts delivered in just days. Backed by expert engineering support, we offer comprehensive solutions including precision mold tooling, overmolding, and insert molding. Partnering with TUOWEI means faster lead times, consistent quality, and the flexibility to scale production while keeping costs competitive.
We deliver aluminum and steel molds, achieving 0.0008 in tolerances with free mold flow analysis provided.
Our overmolding process bonds plastics to substrates, creating durable, integrated products with strength, flexibility, and customizable finishes.
Insert molding combines plastics with pre-placed inserts, eliminating fasteners while enhancing strength, efficiency, and overall part performance.
TUOWEI Precision makes it simple to move from rapid prototypes to full-scale production with high-quality, cost-effective plastic parts delivered in just days. Backed by expert engineering support, we offer comprehensive solutions including precision mold tooling, overmolding, and insert molding. Partnering with TUOWEI means faster lead times, consistent quality, and the flexibility to scale production while keeping costs competitive.
Build the Foundation for Flawless Parts.Secure high-quality, fully custom aluminum or steel molds. We guarantee tight tolerances (±0.02mm) and provide free mold flow analysis, ensuring your tool is optimized for performance, longevity, and cost-effective mass production.
Designed for efficient, high-volume production, our plastic injection molding services deliver consistent quality, precise details, and repeatable results. With injection molding presses ranging from 90 to 830 tons, we manufacture custom plastic enclosures, precision components, and consumer products for a wide range of industries.
Combine plastics with compatible substrates through overmolding to create durable, functional, and visually appealing components. This process can improve grip, enhance sealing, reduce secondary assembly steps, and support flexible design options for custom plastic parts across a wide range of industries.
Integrate metal inserts, threaded fasteners, and other compatible components directly into molded plastic parts through insert molding. This process enhances structural strength, improves component retention, and reduces secondary assembly operations, delivering application-specific components
Manufacture flexible, durable components with liquid silicone rubber (LSR) molding, designed for applications requiring thermal stability, elasticity, and reliable performance. LSR is suitable for seals, gaskets, ergonomic grips, and flexible membranes across automotive, medical, and industrial applications, with biocompatibility dependent on the selected grade and applicable certifications.
Manufacture intricate, miniature plastic components with exceptional dimensional accuracy and fine feature definition. Micro injection molding supports applications requiring precise geometry and tight tolerances, including medical devices, micro-optics, and miniaturized electronics.
Eliminate Defects in Strong, Lightweight Parts.Perfect for thick-walled components. By injecting pressurized gas into the melt, we create hollow internal structures that prevent sinks and warpage, significantly reduce part weight and material use, and deliver excellent surface finish.
Combine Aesthetics and Function in One Cycle.Integrate two different materials or colors in a single, efficient molding process. This technique enhances product value, ergonomics, and brand differentiation by combining, for example, a rigid substrate with a soft-touch TPE layer without secondary operations.
TUOWEI Precision delivers advanced injection molding solutions with tight tolerances. Our capabilities guarantee consistent, high-quality production with efficiency and reliability for projects across diverse industries.
| Plastic Injection Molding Service | Tolerance |
|---|---|
| Standard Plastic Injection Molding | ±0.005" (±0.127 mm) |
| High-Precision Plastic Molding | ±0.001" (±0.025 mm) |
| Plastic Molding for Large Parts | ±0.010" (±0.254 mm) |
| Plastic Molding with Thin Walls | ±0.005" (±0.127 mm) |
| High-Volume Plastic Molding | ±0.003" (±0.076 mm) |
TUOWEI Precision ensures reliable injection molding tolerances, delivering consistent accuracy and quality for every project.
| Design Element | Guideline |
|---|---|
| Wall Thickness | Uniform thickness of 1.5 mm to 3 mm is recommended. |
| Radii and Corners | Minimum radius of 0.5 mm for internal corners. |
| Draft Angles | Draft angle of 1° to 2° is recommended on vertical walls to ensure smooth part ejection. |
| Undercuts | Use side actions or lifters to accommodate undercuts. Proper mold design is necessary for parts with undercuts. |
| Tolerances | Standard tolerance of ±0.1 mm. For tighter tolerances (±0.01 mm). |
| Text and Logos | Minimum engraving depth of 0.1 mm and width of 0.5 mm. |
| Holes and Features | Minimum hole diameter of 1.5 mm. For holes larger than 5 mm. |
| Parting Line and Gate | Gates should be placed to minimize defects, and parting lines should be positioned in non-visible areas. |
| Material Selection | Choose appropriate materials such as ABS, polycarbonate, or nylon. |
Following are the surface finishing techniques used to enhance the appearance and functionality of molded parts:
Polishing removes imperfections and burrs from the surface, providing a smooth, glossy finish on the molded parts.
Bead blasting creates a consistent matte surface finish that helps mask any mold lines or imperfections on quick-turn parts.
Texturing adds visual appeal and grip to the surface of the part, commonly used for quick-turn consumer goods with tactile requirements.
Laser engraving is used for precise marking or part identification, allowing for high-speed production without compromising quality.
Vibratory finishing is used to smooth rough edges and surfaces, ensuring quick-turn molded parts meet both aesthetic and functional standards.
Electroplating applies a thin metal coating, enhancing the part’s appearance, wear resistance, and corrosion protection.
Engineers and leading manufacturers trust TUOWEI for fast iterations and durable, high-performance parts. Whether for prototyping or full-scale production, our extensive material selection ensures precision, strength, and reliability for any CNC machining project.
General-purpose ABS
High-Impact ABS
Flame Retardant ABS
Medical ABS
Low-Density Polyethylene (LDPE)
High-Density Polyethylene (HDPE)
Linear Low-Density Polyethylene (LLDPE)
General-purpose PS
High-Impact PS
Crystal PS
Rigid PVC
Flexible PVC, CPVC
High-Impact PVC
Nylon 6
Nylon 6/6
Glass-Filled Nylon
Heat-Resistant Nylon
Homopolymer POM
Copolymer POM
Glass-Filled POM
Styrenic Block Copolymers (SBC)
Thermoplastic Vulcanizates (TPV)
Thermoplastic Polyurethane (TPU)
PET
PET-G (glycol-modified)
PET-High Crystallinity (HCPET)
Rigid PU
Flexible PU
TPU (Thermoplastic Polyurethane)
Noryl (PPO blended with polystyrene)
High-Temperature PPO
With Tuowei Precision’s CNC milling service, you’re not just investing in advanced machinery. You’re gaining the assurance of flawless precision, commitment to strict timelines, and the expertise of skilled professionals dedicated to meeting your needs.
Tuowei Precision’s ISO-certified CNC machining guarantees exceptional accuracy and quality. Every part is crafted for perfect fit and flawless performance, with rigorous quality control at each stage.
Stay on schedule with Tuowei Precision. Our state-of-the-art equipment and local workshops deliver rapid production to meet your tight deadlines.
Rely on our team for comprehensive CNC machining support. Our experts are available to optimize design efficiency and ensure top-quality results at every step.
At TUOWEI Precision, quality is at the core of every project. From design to production, our cross-functional reviews and rigorous checks ensure superior results, delivering up to a 90% first-pass yield on all plastic molded parts.
Mold and Pre-Production Inspection
We start with precision mold design and thorough pre-production reviews. Our engineers carefully evaluate geometry, material flow, and cooling systems to ensure seamless processing. Trial runs are conducted to confirm mold performance, guaranteeing stability and consistency before full-scale production.
In-Process Quality Control
During manufacturing, strict monitoring ensures reliability at every stage. Key injection parameters—including temperature, pressure, and speed—are maintained within defined limits. Regular dimensional and visual checks help detect deviations early, reducing waste and ensuring consistent product quality.
Final Inspection
Before delivery, all parts undergo comprehensive final inspection. Our team evaluates dimensions, surface quality, and physical performance using advanced tools such as CMMs and colorimeters. This ensures every component meets both customer requirements and TUOWEI’s strict internal standards.
APPLICATIONS
Injection molding is a highly efficient process used to manufacture a wide range of products, from automotive components to medical devices. It delivers consistent, high-quality parts with tight tolerances at a low cost per unit, making it the preferred choice for mass production across industries.
Advantages
Injection molding is a highly efficient process used to manufacture a wide range of products, from automotive components to medical devices. It delivers consistent, high-quality parts with tight tolerances at a low cost per unit, making it the preferred choice for mass production across industries.
Since the era of rapid prototyping through scalable production, Tuowei Precision helps with your project because of its reliable CNC machining and manufacturing services. Our team collaborates with you to make sure that there is accuracy, consistency, and a smooth execution at all levels.
Begin your project now and start with the first step towards efficient and high quality manufacturing with Tuowei.
Whether you’re creating a small batch of custom parts or scaling up for high-volume production, Tuowei Proto services offer the flexibility you need.
CNC rapid prototype machining is perfect for creating engineering or production prototypes that closely resemble the final product in both appearance and functionality. At Tuowei, we offer instant quotes and fast delivery, providing you with precise, high-quality CNC machined prototypes for your needs.
Low volume CNC machining often acts as a bridge between prototyping and mass production for new and emerging production. With Tuowei, this process becomes easier, more efficient, and cost-effective, allowing you to scale production quickly while maintaining high-quality standards.
CNC production machining is the best solution for producing a thousand parts or more efficiently. Leveraging a diverse selection of materials and automation and multi-axis capabilities, Tuowei delivers high-volume production with tight tolerances, superior dimensional accuracy, high reliability and fast turnaround times.
Keep updated on the real CNC machining, industry trends, and production insights in Tuowei Precision, but is installed to enable you to make better production decisions.
Can I Get Prototype Parts Before Full-Scale Production?
Yes. TUOWEI Precision offers rapid prototyping services to validate designs before committing to mass production. Prototyping allows for design testing, early detection of issues, and cost-effective adjustments, ensuring a smoother transition to full-scale manufacturing. This step helps optimize performance, minimize risks, and guarantee production-ready parts.
How Much Does Injection Molding Cost?
Pricing depends on part size, mold complexity, number of cavities, chosen material, and finishing requirements. Every project is unique, so TUOWEI Precision provides customized quotes tailored to your specifications. This transparent approach ensures you understand costs upfront. Upload your CAD files and requirements, and our team will provide a detailed estimate.
What Is the Minimum Order Quantity?
TUOWEI Precision has no minimum order requirement for injection molding services. Whether you need a single prototype or thousands of units, we deliver the same commitment to quality. Larger orders benefit from cost savings due to economies of scale, making bulk production more affordable per unit.
What Are the Typical Tolerances for Injection Molded Parts?
TUOWEI Precision adheres to ISO 2768-c standards for general tolerances, ensuring consistent, reliable part production. For projects requiring stricter specifications, we provide tighter tolerances customized to each client’s needs. This flexibility guarantees parts fit accurately, function correctly, and meet the demanding requirements of industries such as aerospace, automotive, electronics, and medical devices.
What Are the 4 Stages of Injection Molding?
Injection molding is a systematic process with four critical stages that ensure high-quality, precise plastic parts:Clamping: The two halves of the mold are securely clamped to prevent leakage during injection Injection: Molten plastic is injected into the mold cavity under high pressure for complete filling.
Cooling: The plastic cools and solidifies inside the mold, ensuring correct dimensions and durability.Ejection: Once solidified, the part is ejected from the mold, and the cycle begins again.
