Several Key Factors Affecting The Selection Of Shoemaking Process

It is usually very difficult to choose what kind of process to produce a component, but if you choose the wrong process, it will be a costly mistake.

Material: whether thermoplastic or thermosetting plastics have elastic foaming or solid materials, single or multiple material sizes are large or small, thick or thin.

Tolerance / tolerance: tight average level loose volume / capacity low medium height

1. is the basic shape feasible for the selected process?

The first step in process selection is to evaluate the difficulty of a particular process in producing a shape part.

For example, injection molding process, structural foam molding process and reaction injection molding process can produce multiplanar parts.

Through the above process, the dies needed for producing parts need negative (concave) Yang (convex) sides.

The ability of these processes to produce a shape is limited by the inner surface of the die.

To choose the best process of performance price ratio, we must consider the number of spare parts and the performance characteristics of the process each year.

The larger the required parts and components, the more likely the blow molding method is the most appropriate process.

However, due to the limitation of blow ratio of materials, the shape of parts will be limited.

When approaching the size limit of the processing technology, the adverse results of cost and / or performance will be generated.

Large parts require large equipment to match, which increases the manufacturing cost.

The injection molding process must be limited by the length of the material used and the pressure of the machine.

Other technologies are more capable of producing large parts.

The raw materials used in the reaction casting process (RIM) are low viscous liquids, which are mixed when they are injected into the mold.

The above process can be used to manufacture super large parts.

Blow molding process can also produce super large parts, but it must be limited by the melting strength of the materials used and the size of the equipment used.

Thermoplastic molding and rotational molding are used to produce giant parts.

It is very important to check the size and performance requirements before deciding on process selection.

It is best to consult and communicate with distributors who have expertise in manufacturing large parts.

Each process has unique ways to provide complexity, but also to limit its use.

The injection molding process can provide the highest degree of complexity.

Other processes can only provide lower complexity.

The complexity provided can be limited by the gas compression force or material used.

The reaction casting process can provide higher complexity and detail because the viscosity of the material when entering the mold is low.

The degree of complexity provided by the thermoplastic process is restricted, and tolerance is even worse than that based on injection molding, blowing molding or reactive injection molding.

The basic shape of components can provide clues for its structural possibilities and how to achieve the required structural strength.

The specific technical methods used by each process to achieve the required structural performance are different.

However, in the early stage of the project, it is critical to understand the aesthetics required for the surface of the moulded parts.

But it is difficult to reach a consensus on the definition of surface beauty.

If the quantitative method can not be used, it may be better for the two sides to agree to choose a visible sample as a "mutually agreed" standard.

The possibility of obtaining high gloss surface by blow molding is not as good as that of injection molding.

The surface texture can be reprocessed, and it can be further improved in the smooth surface area, but the production cycle will be prolonged.

The thermoplastic surface is limited by the quality of the sheet used for the production parts.

Texturing the surface is also used to produce beautiful molded surfaces.

According to the quality of the film and mold surface, through the use of film to finish the mold decoration in the thermoplastic molding process, it can provide a very good surface effect.

The cost depends on raw materials, quantity of production, and many other factors.

However, consideration must be given to the effects of the selected process.

There is a certain relationship between the die size and the pressure of the process operation, and the cost of the mould is linked to the process.

Manufacturing technology affects the variable cost to a large extent.

Equipment cost, labor cost, production cycle and two processing requirements such as die surface polishing will affect the final cost.

The higher the automation level, the lower the variable cost.

However, production also has an important impact on costs.

Have we considered the tolerance capacity of the process within the required limits?

Will the mold cost be amortized by a reasonable number of moulded parts?

Or is the mold cost too high for the required moulded parts?

For small batch moulded parts, the two processing cost is higher than the expensive mold investment.

This can not only shorten the production cycle of new products, but also reduce the cost of development process.