Product design and development involves a number of processes in order to increase the chances of success once in the market. To do this, the process of product design is initiated with the creation of a product design specification or PDS. The PDS documents all of the necessary requirements and constraints the new design must adhere to. It can also be said the PDS outlines what the market demands of the product and often involves detailed market research. Solutions or concept designs should be generated with reference to the PDS.
The number of sections or areas of specification can vary from one design team to another; however there are some recommended headings as detailed below: Continue reading
Popular manufacturing process for plastic products and here we explain how product design considerations must be made.
- Allows excellent surface finish, repeatability and speed.
- Mould decorations can be integrated into the actual moulding process, eliminating the need for a separate printing process
- Colouring is possible
- Inserts and snap-fits can be moulded to aid assembly
- Tooling costs are very high, depending on the number of cavities and complexity of the design
- Large parts take longer to solidify and thus can increase mould cycle times
- High volume production runs only
- Mould cycle times depend on the size of the part
- Warping and shrinkage can occur after the part is ejected from the mould cavity, ribbing can help reduce these effects
- Stress can occur at sharp corners and draft angles
- Draft angles should be at least 0.5o
- The melted plastic must inject into the thickest section and finish at the thinnest
- Wall thickness should be uniform (ideal) or within 10%
- Uneven wall sections cause the part to warp
- Ribs should not exceed 5 times the height of the wall thickness, so use many shallow ribs instead
Injection moulding machine. Source: http://www.crabdev.co.uk/comp%20manufacturing.htm
Source: Manufacturing processes for design professionals; Rob Thompson 
Figure 1 - Development Tree
Work undertaken by a engineering design service will vary considerably with different branches of industry. Generally, work of a “design and make” nature will follow a plant which sets out stages in development from the time a potential client makes an enqiry until the completed product is delivered. The function of the product will dictate many of the associated activities.