The torpedo system is one of the first hot runner heated nozzles introduced to the moldmaking industry. The concept is simple – a cartridge heater is inserted into a gun-drilled hole running through the center of several flow channels. […]
Tubular heating elements are inserted into a milled slot into the manifold. This allows for a more accurate location of heat at the areas that require the most (i.e., nozzle exits). […]
Cartridge heaters are utilized around the flow channel to ensure uniform temperature. It is important to keep the distance between the heaters and the manifold equal or greater than 1x the diameter of the heating. […]
EDMing thin ribs is a difficult application. High-speed machining of the elec-trodes has made it possible to fabricate these electrodes from grades that are not capable of maintaining the detail in the cavity. […]
High-speed machining centers have made it possible to machine intricate detail into almost any grade of graphite, a task that would have been impossible using manual or CNC machining equipment. […]
The physical properties of each grade of graphite determine the ranking within classifications. The properties that influence performance are particle size, flexural strength and shore hardness. […]
The graphite industry is constantly striving to produce higher quality grades. Graphite materials have continued to evolve along with the other aspects of the EDM industry, […]
Graphite is the material of choice for the majority of EDM electrodes produced today in the United States. Selecting the best grade of graphite for a particular application can be difficult if the differences between graphite grades are not understood. […]
When the above summaries are applied to the acquisition of molds, it should be apparent that a hot runner system can significantly reduce initial cost, tool construction time, and operating expenses of trials, setup, cycle time, maintenance, scrap and secondary operations—and with an efficient valve gate system—no additional equipment is necessary. […]
When designing molds of multicavity layout using cold runner systems, the mold size often is increased to accommodate the runner, slides and mechanisms—and the cavity is more difficult to orientate for complex part shapes. […]