Method and apparatus for heating mold by high frequency current
First Claim
1. A method for heating two mold inserts facing each other through high frequency current having steps of:
- two mold inserts having heating surface face each other, at least more than one coil guide hole approaching heating surface of first mold, let coil penetrate coil guide hole, and the penetrated coil will be connected to the coil which penetrates the second mold coil guide hole through a coil connector, then at least one coil assembly which encloses two mold insert heating surfaces having face to face to each other is formed, moreover, ends of the coil assembly are connected to high frequency power supply system, high frequency current is added to the coil through high frequency power supply system to heat mold insert heating surface, then adjust the power output and frequency to control the heating speed and temperature of mold insert heating surface.
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Accused Products
Abstract
The method and apparatus of the invention is used to heat the surface of the mold insert or cavity by high frequency current. There are holes near the heated surface in the mold and the coils can be installed into the holes. The coils surround the heated surface and are conducted with high frequency current. Due to the directional change of the current, the blocks that are surrounded by the coils will be heated by the hysteresis losses and the eddy-current losses. The surface of the mold insert or cavity will be heated rapidly. There are cooling holes set near the heated surface or beside the coil-pipe. The cooling liquid or air can flow in the holes to carry out extra energy and the temperature of the mold will be decreased. The position of the cooling holes, the flow speed and temperature deviation of the liquid and air will influence the temperature of the mold. The method and apparatus will improve the quality of the thermal-plastic products and elevate the number of the cavity.
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Citations
20 Claims
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1. A method for heating two mold inserts facing each other through high frequency current having steps of:
two mold inserts having heating surface face each other, at least more than one coil guide hole approaching heating surface of first mold, let coil penetrate coil guide hole, and the penetrated coil will be connected to the coil which penetrates the second mold coil guide hole through a coil connector, then at least one coil assembly which encloses two mold insert heating surfaces having face to face to each other is formed, moreover, ends of the coil assembly are connected to high frequency power supply system, high frequency current is added to the coil through high frequency power supply system to heat mold insert heating surface, then adjust the power output and frequency to control the heating speed and temperature of mold insert heating surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus using high frequency coil for the heating of mold insert surface, having the following features:
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at least more than one mold insert having one heating surface on it, and at least more than one coil guide hole is penetrated through both sides of heating surface;
at least more than one coil wherein the coil is penetrated into the coil guide hole of the mold insert;
at least more than one coil connector wherein the coil connector connects the coil end that penetrates through two adjacent mold inserts into a coil assembly;
moreover, the end of coil assembly is connected to high frequency power supply system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification