Chloe Zhang
Thick solid plastic can be manufactured using a variety of techniques, including 3D printing, CNC machining, rotational molding, and injection molding. Each method has its advantages and suitability for specific applications. For instance, rotational molding is ideal for creating large, hollow, or concave shapes, while injection molding is suitable for high-volume manufacturing. The choice of technique depends on factors such as cost, complexity, precision, and the desired characteristics of the final product. Plastics themselves also come in thousands of varieties, each with unique properties, further influencing the manufacturing process.
| Characteristics | Values |
|---|---|
| Plastic types | Thermoplastics, thermosets, resins, pellets, powders, solid-form plastics |
| Plastic states | Solid, liquid, molten |
| Plastic forms | Sheets, blocks, bars, rods, pellets, powders, liquids, resins |
| Manufacturing methods | Injection moulding, rotational moulding, extrusion blow moulding, reaction injection moulding, 3D printing, CNC machining, vacuum moulding, thermoforming, pultrusion |
| Manufacturing steps | Heating, cooling, part removal, mould preparation, forming the shape |
| Mould materials | Wood, aluminium, resin |
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What You'll Learn
Plastic injection molding
Plastic injection moulding is a common and popular method for manufacturing plastic parts. It is a high-volume manufacturing method that can be used to produce large quantities of plastic components quickly and at low prices.
The process involves melting plastic pellets or granules into a liquid, which is then injected into the empty cavity of a forming die or mould. The mould is usually made of metal and consists of two, clamshell-style pieces. Once the mould is clamped together, the liquid plastic is injected and fills the entirety of the mould. Pressure is applied directly to the mould to ensure the liquid fills every cavity, and the product takes on the shape of the interior surface.
The next stage is the cooling stage, where the mould is left alone so that the hot plastic inside can cool and solidify into a usable product. Once the plastic has solidified, the mould can be opened, and the finished part is ejected. The part may then require finishing processes such as polishing, dying, or removing excess plastic, before it is ready for distribution.
The plastic injection moulding process requires a high level of precision, and upfront tooling costs and significant lead times may be obstacles for manufacturers. Tooling requires product design teams to design and prototype a part, often via 3D printing, and then create a mould that can be used to make the part. However, once the mould is complete, the same injection moulding process can be repeated thousands of times to create identical parts.
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$117.49 $129
Rotational molding
The rotational molding process involves placing a mold in an oven and heating it while rotating it. The mold is filled with plastic resin powder, which melts and uniformly coats the interior. The heating time of the polymer is crucial as excessive heating can lead to thermal degradation, reducing the mechanical properties of the final product. Similarly, insufficient heating can result in incomplete melting of the polymer, leading to bubble formation and adversely affecting the product's mechanical properties.
The rotation ratio, which is the number of rotations per minute (RPM) on the horizontal axis divided by the RPM on the vertical axis, must be determined to ensure even wall thickness distribution. For spherical or cubic molds, a rotation ratio of 4:1 is typically used, while for irregularly shaped solids, the ratio may need adjustment.
The type of rotational molding machine is determined by the direction in which the mold travels during the process. Common types of rotational molding equipment include clamshell machines, turret machines, shuttle machines, vertical wheel machines, rock and roll machines, and open-flame machines.
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Extrusion blow molding
Extrusion blow moulding is a manufacturing process used to create highly technical, functional parts, such as fluid reservoirs and HVAC ducts. It is also used for plastic products with standard material properties, basic geometries, and simple functionality, such as water bottles and cosmetic containers. This process is commonplace, less complex, and requires less precision.
The process can be broken down into five steps. First, plastic pellets are melted in an extruder with the help of a heated barrel and sheer force. Both temperature (frictional and external heat) and pressure melt the plastic. The molten plastic is then moved through the extrusion tooling to create a parison, or a viscous plastic tube. The parison is then captured and closed into a water-cooled mould. Next, compressed air is blown into the parison, inflating it into the exact shape of the mould cavity, thus forming a hollow bottle, container, or part. This process is similar to glassblowing.
Extrusion blow moulding is the fastest and most cost-effective plastic moulding process when the production volume reaches 3,000+ parts per year. It is also possible to combine the plastic compression moulding process with the blow moulding process to precisely control both the outer diameter (OD) and inner diameter (ID) of the part.
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3D printing
There are various 3D printing technologies available, each utilising different forms of plastic and offering distinct advantages. FDM, or FFF, is a popular and affordable technology that extrudes plastic filaments to create prototypes. It is ideal for low-cost solutions but may lack the precision of other methods. SLA, or Vat Photopolymerization, is another technology that uses a laser or light source to solidify a vat of resin, offering a range of thermal and mechanical properties. SLA printers are now more affordable, with some models under $200.
SLS, or Selective Laser Sintering, is a process that uses plastic powders to produce high-quality 3D plastic parts, suitable for functional prototypes and small production runs. This method can create durable parts with a full range of capabilities, including isotropic properties and high impact strength. Another technology is Material Jetting, which can print with plastic resins and offers more accuracy and part quality for industrial applications.
The choice of plastic material depends on the specific application. Low-cost standard plastics include ABS (acrylonitrile butadiene styrene) and PLA (polylactic acid), the latter being made from renewable raw materials like corn starch. For general-purpose engineering, acrylics and nylon are used, while high-performance applications require plastics like PEEK (polyether ether ketone) and PBI (polybenzimidazole). PET, or Polyethylene terephthalate, is commonly used in thermoforming and 3D printing, often combined with glass fibre to create engineering resins.
Additive manufacturing with 3D printing offers significant advantages in customisation, complexity, and supply chain support. It allows for the creation of lightweight complex internal geometries, such as honeycomb and lattice structures, which can be beneficial for prosthetics and medical devices. The ability to customise devices according to patient-specific needs, such as body shape and gait, showcases the transformative potential of 3D printing in healthcare.
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CNC machining
CNC turning is the opposite of CNC milling, where the workpiece rotates instead of the cutting tools. This process is commonly used for producing shafts and achieving higher accuracy. CNC drilling, another critical process, involves using a drill bit to create holes in a plastic block. Maintaining sharp CNC drill bits is essential to avoid putting too much stress on the part, which can lead to tooling problems and performance issues.
When working with plastics, machinists face challenges such as poor surface finishes and dimensional changes. Understanding the unique complexities of plastic machining is crucial to achieving high-quality results. For instance, softer plastics may "flow" around the cutting tool instead of forming chips, while harder plastics can fracture unpredictably. Additionally, overcompressing the plastic during machining can lead to deformation and stress-induced expansion.
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Frequently asked questions
Thick plastic parts can be manufactured using Computer Numerical Control (CNC) machining. This subtractive process involves cutting and shaping a solid block of plastic with a CNC machine, which follows instructions from a digital model.
The first step is to design a 3D digital model of the final product. This model is then translated into a series of instructions for the CNC machine using Computer-Aided Manufacturing (CAM). Next, the raw plastic material is secured to the machine, which then cuts and shapes the plastic according to the digital model.
Other methods include rotational molding, which uses gravity to help attach the plastic material to the walls of a mold and achieve the correct thickness. Thermoforming is another process that uses heat to form plastic sheets into the desired shape. Finally, 3D printing can be used to create complex, customized objects from a digital file.
It is important to consider the characteristics ideal for your specific application and compare them to the available manufacturing processes. For example, the desired thickness, complexity, and precision of the final product can help determine the most suitable process. Additionally, the type of plastic used, such as thermoplastics or thermosets, will influence the manufacturing method.
