Plastics

Download Mold-making Handbook by Gunter Mennig, Klaus Stoeckhert PDF

By Gunter Mennig, Klaus Stoeckhert

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14). The inclined bolt as a cost effective and simple drive is used when the moving stroke is not extremely long. 16). 15). 17 shows that the bolt f has a 2 to 3° lower inclination angle g than the wedge angle h. This encourages that the last phase of the movement is done by the wedge surface and the bolt is released in final position. When opening the mold, the bolt f pushes the slider b so far out until the undercut on the molded part is released. A spring- loaded ball catch d is maintaining the slider in open position thus enabling that the bolt later can enter into the drilling of the slider.

G. 0,1 second in extreme cases), an air trap can be formed. This will influence the filling process severely: increase in temperature by air compression and consequently degradation of the plastic, “diesel effect”. Sufficient air escape can be achieved by deep grinding marks on the mold parting line that shouldn’t be too smooth or contaminated, by mold inserts, splits or sliders as well as ejector pins. These regular air gaps are sometimes not sufficient so that additional venting systems are needed. 55).

Centering of tapered elements occurs only with contact. Correct positioning allows thermal expansions as well. 12 (on the right), the flat centerings allow different temperatures of both mold halves without any loss of centering effect. The considerable high effort for the hotrunner-valve gate technology is only economical for large production numbers. However, the electromagnetic operation of the needle offers a cost-effective solution due to the elimination of tubing. It should be noted that the temperature limit for electromagnets is around 80 °C.

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