Pretoughening The process of through-hardening steels and then finish machining them is time consuming and expensive; to avoid this, prehardened or pretoughened steels have been developed,the effect the steel is heat-treated in a similar way to normal through-hardened steels but…
Heat treating is a science in itself and should be left to specialists. One of the reasons the designer should stay with a minimum selection of tool steels is to avoid the many heat treatment specifications, which are usually different…
Bismuth-Tin Alloys These alloys are more commonly known as ‘Certo alloys, . When subject to shock loading they are quite brittle, but under constant loading conditions they exhibit some plasticity, Unusually the mechanical strength of these alloys increases with ageing.…
Zinc Alloys Zinc alloys have poor mechanical] strength and are unsuitable for production tooling. They are, however, often used for prototype tooling where only a relatively small number of parts are required for preproduction evaluation purposes. They have a low…
There is a noticeable trend towards the use of aluminum alloys for medium- to high- volume production in theUK, theUSAand increasingly in mainlandEurope. The principal advantages of this material are: It costs less than steel. It has good…
For large mold tools, plate steel from tolled or forged stock is often not available in the sizes that may be required. Even when plate steel is available in these sizes it is seldom economic to machine cavity forms directly…
the following sheet lists the different types of steel available for mold plates together with a brief account of their properties and uses* Mold steel applications Category Uses Standard Comments Low-carbon, also known as plain plates, carbon or mild steel…
Steel is the industry standard material for the manufacture of mold tool. It is considered a good all-round material embodying many of the desirable characteristics that we are looking for. There are many different types of steel available for a…
It is very important to ensure that the correct materials are specified in all new injection mold designs. Use of incorrect or inappropriate materials can lead to poor mold performance in production and to early failure of the tool. In…
Mould Ventilation At the begin from the injection cycle, the mould impressions contains air which should vent as it’s displaced through the incoming melt. Inadequate ventilation can lead to intensive compression and heating from the trapped air, producing slow filling,…