T- and X-Ejectors
Reliability of Production Increased in Demolding
Considering the overall target of cost saving, material usage is to be reduced continuously when producing parts by injection molding. As a result, designers need to reduce as far as possible the wall thicknesses of products, which means they have to adapt elements such as fillets, due to the necessary wall thickness/rib ratio. This change leads to higher injection pressure being required in order to fill the article completely. The moldings will then tense more inside the cavities. This is why demolding is often quite demanding.
It is a well-known fact in statics, that T- and X-profiles enhance the stability of load-bearing components considerably. With the T- and X-ejectors recently developed by Herbert Bübel design office in Nuremberg, Germany, stability is up to 12.5 times higher than for conventional components, subject to the respective type and make. Other than with conventional ejectors, the T- and X-ejectors do not tend to buckle or break, despite the high pressure load together with the high ejector stroke. This is how – in terms of demolding – they provide for maintenance-free serial production.
Unpredictable idle times have severe consequences for an enterprise. The operator has to remove the material from the injection molding machine, dismantle the mold, carry out repairs in the cavity area, if necessary, replace damaged components, assemble the mold, set up and move the machine into position again. All these things increase maintenance costs and lead to supply difficulties for the company. Additionally, the operator never knows when the next malfunction will occur in the same spot.
The T- and X-ejectors can be exchanged for conventional components. Only additional ribs in T- or X-shape must be introduced into the ejector guidance and into the cavity. Experience from design has shown that this is possible in 90 % of all cases, with no additional work required on the mold. Thanks to their stable structure, T- and X-ejectors require no extra unit to stabilize the ejector blade. For large molds, they provide the additional benefit of enabling enormous excess lengths, thus making dispensable extra elongation units, which are often disturbing.
Herbert Bübel states that applying T and X-ejectors in injection molds increases process safety in serial production. Unpredictable interruption of production when demolding an article are now a thing of the past, as are the enormous maintenance cost and supply difficulties entailed.
Organisationsbüro Herbert Bübel
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