Ethan Clarke
Creating custom plastic parts can be a lengthy process, requiring careful planning and consideration. It begins with an idea, which is then sketched out and refined through trial and error with the help of engineers and designers. Once the design is finalized, the next step is to select an appropriate resin, taking into account factors such as hardness, flexibility, durability, and heat resistance. The chosen resin will also impact availability and costs. While plastic injection molding is a popular method for custom designs, it may not be suitable for small batches due to initial setup costs. Other options, such as CNC machining, 3D printing, and molding with materials like rubber, silicone, or fiberglass resin, can also be explored based on the specific requirements and scale of the project. Assembly is a critical aspect, ensuring that the final product functions as intended and meets the desired specifications.
| Characteristics | Values |
|---|---|
| Design | Sketch the idea, including all important parts. |
| 3D Modeling | Use 3D software to create a model and consult an engineer to determine manufacturing feasibility and functionality. |
| Resin Selection | Choose a resin based on desired properties like hardness, flexibility, durability, heat resistance, availability, and cost. |
| Manufacturing Process | Select a process like injection molding, CNC machining, polymer casting, or vacuum forming, considering costs, functionality, and complexity. |
| Assembly | Ensure proper assembly, including bonding, installing threaded parts, and bearing assembly, to achieve desired functionality. |
| Production Location | Decide between producing in the USA or countries like China, considering costs, minimum order quantities, and proximity to R&D. |
| Batch Size | Larger batches are more cost-effective for injection molding, while small batches may require alternative methods. |
| Prototyping | Consider creating prototypes before manufacturing to refine the design and avoid costly mistakes. |
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What You'll Learn
Sketch your design idea
Sketching your design idea is an important step in creating custom plastic parts. It helps to visualise your idea and communicate it to your team and partners. While computer-aided design (CAD) tools are available, they are not necessary for sketching. A traditional pencil-and-paper sketch can effectively convey your design idea. However, you will need some drawing skills, which you can acquire by studying a drafting book. Using pencil, graph paper, a drafting scale, and triangles can help create accurate and detailed sketches.
Your sketch should capture all the important parts and details of your design. Consider the functionality you need and the type of design you want. For example, some parts may need to be softer, while others should be harder, impacting the choice of materials. Think about the fabrication techniques that are easy to execute, and utilise those elements in your design. For instance, plastics like PVC and acrylic can be easily glued together or welded.
Additionally, keep in mind the manufacturing process you plan to use, as it will influence your design. Injection moulding, for instance, requires a different design approach than 3D printing or CNC machining. Understanding the relationship between materials and manufacturing processes is vital. Resins suitable for injection moulding may not be ideal for 3D printing.
Creating prototypes based on your sketches is a valuable step. Prototypes will help you identify any design flaws and make necessary adjustments. You can use different prototyping methods, such as 3D printing or injection moulding, to create physical models of your design. This step ensures that your custom plastic part functions as intended before moving to the manufacturing stage.
Overall, sketching your design idea is a crucial step in the process of creating custom plastic parts. It helps to visualise, communicate, and refine your idea before turning it into a physical product. By considering functionality, materials, and manufacturing processes in your sketch, you can streamline the subsequent steps and ensure a successful custom plastic part development.
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Create a 3D model
Creating custom plastic parts involves a lengthy step-by-step process. The first step is to create a sketch of your design idea, ensuring all important parts are visible and detailed. Once you have a sketch, you can proceed to create a 3D model using a 3D software program. This stage involves trial and error, as you will likely notice flaws in your design. It is recommended to consult with someone experienced in plastic part engineering to determine if your design is feasible for manufacturing and if it will fulfil its intended function. Their feedback will help you refine your design.
There are several software programs available for creating 3D models, such as Computer-Aided Design (CAD) software. These programs allow you to create digital representations of your design, which can be used for prototyping and manufacturing. When creating your 3D model, consider the following:
- Complexity: Keep in mind that more complex designs may increase production costs. Consider the number of parts, the complexity of moulds, and any additional manual labour required.
- Specifications: Define the key specifications of your part, including the type of plastic resin, thickness, colour, durability, resistances, porousness, and the number of units required. These specifications will depend on the intended use and end-user of your product.
- Manufacturing process: Different manufacturing processes have their own constraints and requirements. For example, plastic injection moulding has specific requirements for the mould design and the number of units produced. Understanding the constraints of your chosen manufacturing process will help you design a more feasible 3D model.
- Assembly: Consider how the parts will be assembled. Will they be bonded, or will they require threaded parts and bearing assembly? Designing your parts with assembly in mind will ensure they function as intended.
Once your 3D model is finalised, you can proceed to select a suitable resin for your custom part. Different resins have varying chemical and mechanical properties, such as hardness, flexibility, durability, and heat resistance. Additionally, consider the availability and cost of the resin, as some resins may be challenging to source and use in manufacturing.
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Choose a resin
Choosing the right resin is a crucial step in creating custom plastic parts. Resins have varying chemical and mechanical properties, including hardness, flexibility, durability, heat resistance, and more. The selection of the right resin depends on the specific requirements of the part, such as potential stressors, environmental conditions, chemical exposure, and expected service life.
- Polycarbonate (PC): Polycarbonate is a tough resin known for its good temperature resistance, transparency, and dimensional stability. It is commonly used for bottles, containers, housings, light covers, reflectors, safety helmets, and shields.
- Polyphenylene Sulphide (PPS): PPS exhibits very high strength and heat resistance. It is suitable for bearings, covers, fuel system components, guides, switches, and shields.
- Thermoplastic Elastomer/Rubber (TPE/R): TPE/R is a tough and flexible resin used for bushings, electrical components, seals, and washers.
- Acetal (POM): Acetal is a strong and rigid resin with excellent fatigue, chemical, moisture, and creep resistance. It is naturally opaque white and is used for bearings, cams, gears, plumbing components, rollers, rotors, slide guides, and valves.
- Acrylic (PMMA): Acrylic is a rigid and brittle resin that is scratch-resistant and transparent. It is suitable for applications requiring optical clarity, such as lenses or reflectors.
- Acrylonitrile Butadiene Styrene (ABS): ABS is a strong and flexible resin with low mold shrinkage.
- Polypropylene (PP): Polypropylene is a lightweight, heat-resistant resin with high chemical and scratch resistance. It has a tough, stiff, and naturally waxy appearance. PP is commonly used in automotive components.
- Polystyrene: There are two types of polystyrene: General Purpose Polystyrene (GPPS) and High Impact Polystyrene (HIPS). GPPS is brittle and transparent, while HIPS has good impact strength and toughness while being translucent. GPPS is used in cosmetics packaging and pens, while HIPS is used in electronic housings, food containers, and toys.
- Polyvinyl Chloride (PVC): PVC is a tough, flexible, and flame-resistant resin that can be transparent or opaque. It is suitable for electrical insulation and housewares.
When choosing a resin, it is essential to consider the functionality and appearance requirements of the final product. Additionally, the availability and costs of different resins can vary, so it is important to balance costs and functionality when making a selection.
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Consider manufacturing costs
Manufacturing custom plastic parts can be a costly endeavour, and there are several factors that can influence the overall expense. Firstly, the complexity of your design will impact the cost. More intricate designs may require additional steps, such as manually inserting extra parts or creating complex moulds, which can increase production costs. It's important to be practical and consider what is essential for your product to function as intended.
The choice of resin is another crucial factor in determining the cost. Different plastic resins vary in their chemical and mechanical properties, such as hardness, flexibility, durability, and heat resistance. Some resins may be ideal for your part but challenging to source and utilise in manufacturing, driving up costs. Additionally, certain resins may be more expensive due to their unique characteristics or availability.
The manufacturing process you select will also impact the overall cost. Plastic injection moulding, for instance, can balance costs and functionality effectively. While the initial setup and tooling can be costly, the rapid cycle times and ability to produce millions of custom-designed parts make it a cost-effective option in the long run. This process is also renowned for its consistency in close tolerances and wall thickness, ensuring high-quality parts even with intricate geometries.
It's worth noting that the location of manufacturing can also influence costs. Typically, producing plastic parts in China is significantly more affordable than in the USA. However, manufacturing in the USA offers the advantage of proximity between R&D and manufacturing, making it easier for your engineering team to quickly address any issues. The "right-shoring" decision depends on the unique requirements of your project and the balance between cost and convenience.
Lastly, the quantity of parts produced can impact the cost-effectiveness of your endeavour. Injection moulding, for example, may not be the best choice for small batches of 1000 units or fewer. In such cases, alternative methods or outsourcing to countries with lower minimum order quantities, such as China, might be more financially viable.
Overall, considering these cost factors and making informed decisions based on your specific requirements will help you effectively manage the financial aspects of creating custom plastic parts.
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Assembly
Firstly, bonding is an essential aspect of assembly. This step involves joining different plastic components or sub-assemblies together to create a cohesive structure. Various bonding techniques can be employed, such as adhesive bonding, solvent bonding, or ultrasonic welding, depending on the specific materials and requirements of your custom part.
Secondly, the installation of threaded parts is another crucial step in the assembly process. Threaded parts, such as screws, bolts, or inserts, provide mechanical strength and allow for secure connections between different components. It is important to ensure that the threads are properly aligned and tightened to prevent loosening or damage during the use of the final product.
Additionally, bearing assembly is an important consideration during the assembly process. Bearings facilitate smooth rotational or linear movement within the plastic part. This step involves carefully inserting bearings into designated housings or assemblies, ensuring they are securely positioned and lubricated, if necessary, to optimize performance and minimize friction.
The assembly process may also encompass other tasks, such as the installation of seals, gaskets, or other specialized components, depending on the nature of your custom plastic part. It is important to work with experienced manufacturers or engineers who understand the unique characteristics of plastics and can properly assemble your product to meet the desired specifications and functionality.
Furthermore, it is worth noting that the assembly process can vary depending on the manufacturing method chosen for your custom plastic parts. For example, injection molding, a popular method for custom designs, may require specific assembly steps to integrate molded components into the final product. Other methods, such as CNC machining or vacuum forming, may have their own unique assembly considerations. Therefore, it is essential to carefully plan the assembly process in conjunction with the chosen manufacturing method to ensure a seamless and efficient production flow.
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Frequently asked questions
The first step is to create a sketch of your design idea. Make sure all the important parts of your idea are visible and detailed. If you’re unable to sketch your idea, you can have someone else draw it for you.
Once you have a sketch, an engineer can create a 3D model of your proposed custom part using 3D software. You will likely go through a lot of trial and error at this stage as you notice flaws in your design. Consult someone well-versed in plastic part engineering to determine if your design is fit for manufacturing and will fulfill its intended function.
Plastic injection molding is the preferred method for creating custom plastic parts as it balances costs and functionality well. While the initial setup and tooling can be costly, cycle times are much quicker, and you can create millions of custom-designed plastic parts at a fraction of the cost of other manufacturing processes.
