Helmet Mould

The helmet mold design process is a multi-step process through which design concepts are transformed into tangible products that play an important role in ensuring the safety and comfort of helmet users.

First, implement an idea or concept for the helmet design. This includes consideration of the target users of the helmet, their needs, and the environment in which the helmet will be used. Sketches are usually made to visualize the idea and provide a preliminary design as a working basis.

Next, the sketch design is converted into a 3d model using computer-aided design (cad) software. This includes the helmet design shape, size, contours, and details of features such as ventilation slots and attachment points can be shown.

Once the digital model is complete, a prototype is created, often using 3d printing technology, allowing the design team to evaluate the physical properties of the helmet design. Factors such as comfort, fit and aerodynamics are tested. If any flaws or areas of improvement are found at this stage, the design is modified and a new prototype is created. This cycle continues until a satisfactory design is achieved.

The first stage is to create a model using 3d printing based on the design and size requirements of the helmet. This model, usually made of materials such as resin or metal, reflects the accuracy of the helmet, including all its details such as curves, indentations and additional points.

Next, create the mold cavity and core. The main model is placed inside a box and liquid molding material, typically silicone or other similar rubber compounds, is poured around it. Once this material solidifies, it forms an exact replica of the shape of the main model, creating the master part of the mold known as the mold cavity. The hardened mold material separates from the main model to form the core.

Once the core and cavity are prepared, the actual helmet mold can now be cast. This is usually done by heating a durable material such as steel or aluminum until it becomes a liquid, which is then poured or injected into the cavity of the mold. Once it solidifies, it forms an exact copy of the original model.

After casting, the newly created helmet mould goes through a finishing process. This involves removing any excess material and smoothing out the surfaces. Depending on the design and mould material, processes like sanding, buffing, and polishing may be used.

The final step in the manufacturing process is quality checking. This involves inspecting the mould to ensure it matches the original design accurately. It includes checking the dimensions, verifying the shape, and confirming that all features have been correctly formed. Any flaws or errors found during this stage are rectified, and the mould may be re-cast if necessary.

Many resins and additives with high corrosion resistance have a corrosive effect on the surface of the mold cavity, which can cause metal dissolution and peeling on the surface of the mold cavity, worsen the surface condition, and deteriorate the quality of the plastic parts. Therefore, it is best to use corrosion-resistant steel or treat the surface of the mold cavity with chrome or nickel plating.

Good wear resistance. The surface glossiness and accuracy of injection molded parts are directly related to the wear resistance of the surface of the injection mold cavity. Especially when some plastics contain fiberglass, inorganic fillers, and certain pigments, they flow together with the plastic melt at high speed in the flow channel and cavity, causing significant friction on the surface of the cavity. If the material is not wear-resistant, it will quickly wear out, causing damage to the quality of the plastic parts.

When injection molding, the temperature of the mold cavity should reach 300 ℃ or above, so it is best to choose tool steel (heat treated steel) that has undergone appropriate tempering treatment, otherwise it will cause changes in the microstructure of the material, resulting in changes in the size of the injection mold. Maintaining good dimensional stability is also important.

Mold parts are mostly made of metal materials, and some of them have complex structural shapes. In order to shorten the production cycle and improve efficiency, it is required that the mold material is easy to process into the shape and accuracy required by the drawings.

Injection molded parts with good polishing performance usually require good gloss and surface condition, so the roughness of the cavity surface is very small. Surface processing, such as polishing, grinding, etc., must be carried out on the cavity surface. Therefore, the selected steel should not contain rough impurities and pores.

In order to improve hardness and wear resistance, injection molds are generally subjected to heat treatment, but this treatment should minimize the size change. Therefore, it is best to use pre hardened steel that can be machined.