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CNC Machining for Aerospace

The extremely high level of precision needed within the aerospace industry makes CNC machining a suitable manufacturing process for the sector.

 

This article provides you with a complete guide to aerospace machining and its importance.

 

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CNC Machining eBook

If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining. 

 

Here, we’ve gathered some basic information and important considerations to help you achieve the desired results.

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HDPE Injection Molding Service

Get reliable, high-quality HDPE injection molding with RapidDirect. Fast。turnaround, custom solutions, and competitive pricing—all designed to meet your exact needs.

hdpe injection molding
what is hdpe injection molding

HDPE in Injection Molding

HDPE (High-Density Polyethylene) is a favored material for injection molding due to its superior properties and adaptability. Its high strength-to-density ratio, excellent impact resistance, and chemical resistance make it suitable for various applications. 

HDPE is also lightweight, easy to process, and cost-effective, which makes it an ideal choice for manufacturers.

Price:$$
Available PA (Nylon) at RapidDirect:PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black
Lead Time:< 5 days
Wall Thickness:1mm
Tolerances:ISO2768-C
Max Part Size:300 mm x 300 mm x 300 mm

Plastic HDPE Properties

PropertiesValue
Density0.941-0.965 g/cm³
Tensile Strength26-33 MPa
Flexural Strength35-50 MPa
Impact StrengthHigh
Thermal Conductivity0.45-0.52 W/(m·K)
Melting Point120-130°C
Coefficient of Thermal Expansion100-220 x 10^-6 /°C
Moisture AbsorptionVery Low
Chemical ResistanceExcellent
UV ResistancePoor without additives

Pros and Cons of HDPE Injection Molding

HDPE plastic offers many benefits that make it suitable for injection molding. However, there are some of its downsides to consider before choosing it for any project. 

Pros

  1. Excellent impact resistance and chemical resistance.
  2. Cost-effective and widely available.
  3. Low moisture absorption and good durability.

Cons

  1. Poor UV resistance without additives.
  2. Limited high-temperature performance.
  3. It can be difficult to achieve a high-quality surface finish.

Applications of Injection Molded LDPE Parts

Injection molded HDPE parts are widely used across various industries, including: 

  1. Automotive: Fuel tanks, seats, and interior components.
  2. Packaging: Bottles, caps, and containers.
  3. Consumer Goods: Toys, household items, and sporting goods.
  4. Industrial: Pipes, fittings, and storage tanks.
applications of hdpe injection molding

FAQs

Key design considerations for HDPE injection molding include maintaining uniform wall thickness to minimize warpage and shrinkage, ensuring adequate draft angles to facilitate easy part ejection, and optimizing gate location to promote uniform filling and reduce stress concentrations. Proper venting is essential to prevent gas traps, and using radii at corners can enhance part strength and reduce stress. Attention to these factors ensures high-quality, defect-free HDPE parts. Additionally, it’s important to consider the environmental exposure of the parts, as HDPE has poor UV resistance without additives.

Achieving a good surface finish on HDPE parts involves optimizing the molding process parameters, including mold temperature, injection speed, and cooling rate. Using a highly polished mold surface can also improve the finish. Additionally, ensuring proper drying of HDPE pellets before molding can prevent moisture-related defects affecting surface quality. Incorporating appropriate mold release agents can aid in achieving a smooth finish. Post-molding processes such as trimming, polishing, or coating may be necessary for applications requiring a superior surface finish.

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