Mould Base Concept for Hot-Runner Moulds
KWO Kunststoffteile GmbH has developed an injection mould with standardised components that incorporates the complete hot-runner system in the mould base. The connection between the mould plates and hot-runner plate can be released without having to remove the mould from the machine. High-precision positioning of the hot-runner nozzles is achieved through a newly developed system of system of guide pins and machined rails. To hold everything together, the partner in the cooperative effort, Schunk, has developed a special quick-clamp system derived from the technology used in the well-established zero-point clamping system. Release is actuated pneumatically.
By re-using standardised mould components, the cost of building a new mould can be lowered by as much as 30 percent. Since only specific mould components have to be manufactured, designing and building the mould is faster. The previous turn-around times of 12 to 16 weeks can be reduced to as few as five weeks.
In addition, use of this system reduces the set-up time in production. The mould base remains in the injection moulding machine; maintenance and replacement of worn parts in the hot-runner system can be performed while the mould is mounted. Set-up only involves exchanging the mould plates. Thanks to the quick-clamping system, the mechanical work associated with set-up can be reduced by as much as 50 percent. In conjunction with a preheating station, set-up and start-up for production can be reduced even further.
This mould base concept offers the greatest economic benefits with hot-runner moulds used to produce complex, high-precision injection moulded parts. Its first application involves a complex connector component for the automobile industry.