Description
Plastic shell design and processing attention：
Plastic structural design specification
1.1, material selection
a. ABS: high fluidity, cheap, suitable for parts with less strength requirements (not directly impacted, not subject to structural durability in reliability testing Parts), such as internal support (keyboard bracket, LCD bracket), etc. There are also commonly used on the electroplating components (such as buttons, side keys, navigation keys, plating decoration, etc.). Chimei PA-757, PA-777D and so on are currently used.
b. PC+ABS: Good fluidity, good strength, and moderate price. It is suitable for parts with high rigidity and high impact toughness, such as frames and shells. Commonly used material code: Bayer T85, T65.
c. PC: high-strength, expensive, and poor liquidity. Suitable for housings, buttons, drive frames, lenses, etc. that require high strength. Commonly used material codes such as: Teijin L1250Y, PC2405, PC2605.
d. POM has high stiffness and hardness, excellent fatigue and wear resistance, less creep and water absorption, better dimensional stability and chemical stability, and good insulation properties. Commonly used for pulleys, transmission gears, worm gears, worm gears, conveyor components, etc., commonly used material code such as: M90-44.
e. The PA is tough and absorbs water, but it becomes fragile when the moisture completely evaporates. Commonly used for gears, pulleys, etc. Key gears with large impact force need to be filled with fillers. Material code such as: CM3003G-30.
f. PMMA has excellent light transmission. After 240 hours of accelerated light aging, 92% of sunlight can still be transmitted. 89% of the outdoor years are still 89%, and UV is 78.5%. High mechanical strength, certain cold resistance, corrosion resistance, good insulation properties, dimensional stability, easy molding, relatively brittle, commonly used in transparent structural parts with certain strength requirements, such as lenses, remote control windows, light guides and so on. The common material code is: Mitsubishi VH00
1. 1.2 The thickness of the shell
a. The wall thickness should be uniform, the thickness difference should be controlled within 25% of the basic wall thickness, and the minimum wall thickness of the whole part should not be less than 0.4mm, and the back of the place is not a Class A appearance surface, and the required area must not be More than 100mm
b. The thickness of the shell in the thickness direction is as much as 1.2~1.4mm, and the side thickness is 1.5~1.7mm;
c. The thickness of the outer lens support surface is 0.8mm, and the thickness of the inner lens support surface is at least 0.6mm.
d. The battery cover thickness is 0.8~1.0mm.
The minimum wall thickness and common wall thickness recommendations for plastic products are shown in the table below. Minimum thickness and common wall thickness recommendations for plastic materials (in mm)
our service：
To support you through your project we use our depth of experience and technical knowledge to provide a high level of design assistance. We fully appreciate that confidentiality is key in bringing products to the market and if we aren’t already an approved supplier to you then we would be happy to sign a Non-Disclosure Agreement (NDA). As we don’t market any of our own products you can also trust that your designs will be protected.
The initial review will take into account the material that has been selected for your component and evaluate the design of the part to ensure that it is compatible with our injection moulding capabilities. At this stage we will also consider the method of production that will be best suited to your individual application as well as any potential packaging requirements.
What assistance can we provide
Plastic material selection
Evaluation of product design
Suggest changes for ease of manufacture
Method of production
Suitable packaging
What elements do we consider on receipt of a new product?
Part geometry
Undercut features
How we can split the product for manufacture
Acceptable feed positions
Surface finish to be applied
Acceptable draft angles
Post moulding requirements
As your trusted partner we believe in challenging designs to achieve the most cost effective solution for your requirements as we understand that a large proportion of cost is at the tooling stage. We see it as our responsibility to ensure that parts that we quote are designed in a way that is conducive to the injection moulding process and can be tooled within the price constraints of a project where possible.
The level of assistance we offer will depend on the status of a project and level of involvement that the customer requires. We would however encourage you to involve your injection moulder at the earliest stage in the design process to ensure the part is designed for the moulding process.
Whether you are at the initial concept stage or have a fully designed and specified product we can be of assistance and work with you as a trusted partner.
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