CN2878025Y - High frequency heating mold - Google Patents

Abstract

A high-frequency heating mould, arrange the guide hole of the coil on the heating surface close to mould, and surround the heating surface with the coil, and then use the high-frequency current on the coil, because the change of direction of current will produce hysteresis loss and eddy current loss at the metal block that the annular closed coil surrounds, make the surface temperature of metal rise suddenly and reach the effect of heating the surface temperature of the mould fast; and bury several cooling holes in mould heating surface and coil guide hole near again to let in cooling gas or cooling liquid in cooling hole and coil guide hole, with the extra heat or the control mould temperature of taking away mould and coil production, the adjustment cooling hole is arranged the position and is controlled the mould temperature with cooling gas or fluid temperature and velocity of flow, utilizes the utility model discloses the device will be used to promote thermoplasticity product quality and increase die cavity quantity.

Description

High frequency heating mold

technical field

The utility model relates to a high-frequency heating mould, in particular to a device which rapidly heats the surface of a mold core with a high-frequency current and can rapidly reduce the surface temperature of the mold core by cooling fluid.

Background technique

In general injection molding, injection compression molding, hot press molding and other processes, the plastic is heated to a molten state and then filled into the mold cavity, and the plastic is coated with a specific structure of the mold and then cooled and solidified to replicate the mold structure. Generally, the temperature of the mold is mostly It is lower than the transition temperature of the plastic glass, so that the molten plastic will produce a layer of solidified layer when it contacts the surface of the mold cavity. The ratio of the thickness of the solidified layer to the thickness of the finished product will increase as the thickness of the finished product decreases. When the proportion of the solidified layer is too high , It will make it difficult to fill the molten plastic, causing problems such as short shots, incomplete structure replication and residual stress.

In response to the trend of modern products being light, thin and short, the design requirements for products made of plastic are becoming thinner and thinner, and even tiny structures, such as backlight panels and optical fiber connectors, need to be designed to meet special needs. If the traditional injection molding method is used, it will not be able to be successfully completed due to reasons such as solidified layer and poor plastic fluidity. Therefore, the development of a method for rapidly heating the mold cavity temperature has been gradually proposed in recent years, and some inventions have been combined to shorten the process cycle time. The method of rapid cooling, the current heating method can be roughly divided into steam type, resistance type and high frequency method, the present invention is described as follows for the previous invention:

U.S. Patent No. 2,984,887 utilizes electric resistance to heat the copper or silver layer plated on the mold surface.

US Pat. No. 3,671,168 and US Pat. No. 3,763,293 use hot fluid to heat the mold cavity by conduction.

U.S. Patent No. 4,060,364 uses a high-frequency induction method to heat the mold.

US Patent No. 4,340,551 uses a high-frequency induction heating device to heat a specific position on the cavity surface before the mold is closed, so that the temperature of the specific cavity surface is higher than the glass transition temperature of the plastic material.

US Patent No. 2,979,773 utilizes resistive heating of the mold cavity surface and cooling with so-called variable conductivity heat pipes.

U.S. Patent No. 5,232,653 uses low thermal equivalent materials as molds, heats the mold with a resistance heating unit, and embeds a cooling system on the surface of the mold to cool the mold.

U.S. Patent No. 5,762,972 discloses that the induction method or the induction method is used to heat the mold, that is, the temperature of the mold reaches a predetermined temperature in a short time by using high-frequency waves or microwaves.

U.S. Patent No. 6,846,445 loads a high-frequency current on the mold, and uses the high-frequency current to generate skin effect and proximity effect on the mold surface to heat the mold surface.

US Patent No. 4,201,742 uses high-temperature and high-pressure steam to fill the mold cavity to heat the surface of the mold cavity, and dissipates the compressed steam in the mold cavity before filling the mold cavity with plastic.

U.S. Patent No. 4,442,061 uses high-temperature steam and water to alternately circulate to control the temperature of the plastic in the mold and cavity in the compression mold injection molding cycle.

U.S. Patent No. 2,004,251,570 uses steam to flow into the guide hole in the mold to heat the mold, and after the plastic is filled, the guide hole in the mold is replaced with cooling water to cool the mold.

Japanese patent JP2000-218356 utilizes an external telescopic induction heating mechanism to inductively heat up the entire mold cavity surface of the movable side and the fixed side mold before the mold is closed, and then close the mold to inject the finished light metal mold.

In Taiwan patent TW505,616 injection compression molding technology to manufacture microsystem chips, micro-electromechanical technology is used to manufacture micro-heaters, and the heaters are made of resistive micro-heaters by micro-electromechanical deposition.

The device of Taiwan patent TW543,334 is installed in the micro heater which can control the local temperature in the mold. In this way, micro-heaters with required fine single-layer or multi-layer structures and series and parallel geometries can be produced, which can be used to heat the local template structure.

The inventions listed above use resistive heating of the mold or resistor, and then heat the surface of the mold cavity or a specific position by conduction or radiation. Due to the heat conduction method, it is easy to cause the temperature difference and time delay between the heating source and the heated surface, and the resistor consumes part Electrical and thermal energy dissipates to non-heated areas.

The inventions listed above use steam to heat the mold, and the heat is transferred from the mold to the heating surface by conduction. The heat conduction method is easy to cause the temperature difference and time delay between the heating source and the heated surface.

The inventions listed above use a high-frequency method to heat the mold surface. For example, the high-frequency US Patent No. 6,846,445 passes a high-frequency current on the mold. Due to the skin effect and proximity effect, most of the high-frequency current flows on the mold surface. This method can quickly heat the surface of the mold cavity, but it can only be practically applied if a high-power high-frequency current is directly passed through the mold and appropriate insulation protection measures are required. The rest of the listed inventions use high-frequency heating methods, most of which use skin effect and proximity effect to inductively heat the mold surface adjacent to the coil, and then transmit it to the mold cavity surface or a specific position by conduction.

Utility model content

The main purpose of this utility model is to provide a high-frequency heating mold that can make the mold heating surface rise rapidly, so as to reduce the thickness of the solidified layer produced by the thermoplastic material during filling the mold cavity, and make it have better fluidity, thereby Product quality can be greatly improved.

The second purpose of the present invention is to provide a high-frequency mold in which a low-temperature liquid can flow through the gap between the coil guide hole and the coil to cool the core temperature and prevent the coil from being burned due to overheating due to current loading.

The high-frequency heating mold that can realize the purpose of the above-mentioned utility model includes:

At least one mold core, the mold core has a heating surface, and at least one coil guide hole is penetrated on both sides of the heating surface, and at least one cooling hole is penetrated on both sides of the coil guide hole;

at least one coil, which is inserted into the coil guide holes of the two cores;

At least one coil connector, the coil connector is connected to each coil end of two adjacent mold cores.

In the above-mentioned high-frequency heating mold, cooling liquid is passed through the coil guide hole.

In the above-mentioned high-frequency heating mold, cooling liquid or cooling gas is passed through the cooling hole.

In the above-mentioned high-frequency heating mold, the position and quantity of the cooling holes are arranged according to temperature control.

In the above-mentioned high-frequency heating mold, the surface of the coil is coated with an insulating material.

In the above-mentioned high-frequency heating mold, the coil is loaded with a high-frequency power supply.

In the above-mentioned high-frequency heating mold, the connection method of the coil connector can be a detachable or retractable or sliding connection.

In the above-mentioned high-frequency heating mold, the coil is connected into one body by a coil connector, so that the space between the two heating surfaces is covered within the area surrounded by the coil.

In the above-mentioned high-frequency heating mold, the coil is integrated by a coil connector, one of the two ends of the coil is the current input end, and the other end is the current output end.

Adopting the above technical scheme, the utility model has a heating surface on the two adjacent mold cores, and several coil guide holes are penetrated on both sides of the heating surface, and then the coil coated with insulating material is penetrated into the two molds. In the coil guide hole of the core, and use the coil connector to connect the coil ends on the two mold cores into one body, which will make the heating surface of the two mold cores be surrounded by the area surrounded by the coil, and the coil is connected The two ends of the device combined into one are the current input (out) end and the current output (in) end, and then connected to a high-frequency power supply. When the high-frequency power supply is loaded on the coil, it will be due to the hysteresis loss and eddy current loss of the core. The temperature in the area close to the two heating surfaces rises sharply. At this time, cooling water or cooling liquid can be passed into the gap of the coil guide hole to cool the coil by conduction; Low-temperature liquid or low-temperature gas can be introduced, and the temperature conduction effect can be used to absorb high-frequency induction heating to generate additional heat, or the mold core and heating surface can be cooled during the solidification stage of the plastic, and the temperature and flow rate of the liquid or gas passing into the cooling hole can also be controlled. To adjust the temperature of the heating surface of the mold core, and the location and quantity of the cooling holes can be determined according to the temperature control.

Description of drawings

Please refer to the following detailed description and accompanying drawings of a preferred embodiment of the utility model, and further understand the technical contents and purpose effects of the utility model; the accompanying drawings of the relevant embodiment are:

Fig. 1 is the three-dimensional view of the mold core of the utility model high-frequency heating mold;

Figure 2 is a schematic diagram of the combination of the mold core and the mold base of the high-frequency heating mold; and

Fig. 3 is a schematic diagram of another implementation of the high-frequency heating mold.

Symbols of main components in the figure:

1. Mold core; 11. Heating surface; 12. Coil guide hole; 13. Cooling hole; 2. Coil; 21. Current input (output) terminal; 22. Current output (input) terminal; 3. Coil connector; 4 , Die base; 41, coil guide hole; 42, cooling pipe guide hole.

Detailed ways

Please refer to Fig. 1 to Fig. 3, the high-frequency heating mold provided by the utility model mainly includes:

At least one mold core 1, the mold core 1 has a heating surface 11, and at least one coil guide hole 12 penetrates on both sides of the heating surface 11, and then penetrates at appropriate places on both sides of the coil guide hole 12 At least one cooling hole 13; cooling liquid can be passed into the coil guide hole 12; cooling liquid or cooling gas can be passed into the cooling hole 13; the arrangement position and number of the cooling holes 13 can be determined according to temperature control;

At least one coil 2, the surface of the coil 2 is covered with insulating material; the coil 2 penetrates into the coil guide hole 12 of the two mold cores 1; the coil 2 can be loaded with a high-frequency power supply;

At least one coil connector 3, the coil connector 3 connects the ends of the coils 2 of the two mold cores 1 into one; the connection mode of the coil connector 3 can be a separable or retractable or sliding connect;

The combination of the above-mentioned components forms the high-frequency heating mold of the present invention; as shown in Figure 2, it is illustrated with a single mold core, the mold core 1 is arranged in a mold base 4, and a coil conductor runs through the mold base 4. The hole 41 and the cooling pipe guide hole 42, the coil guide hole 41 and the cooling pipe guide hole 42 of the mold base will be set corresponding to the coil guide hole 12 and the cooling hole 13 of the mold core 1, and then penetrate into each coil guide hole 12 coil 2, and connect the ends of the coil 2 into one body through the coil connector 3, so that the two heating surfaces 11 are covered in the area surrounded by the coil 2, when the coil 2 is connected into one body, at both ends of the coil 2 A current input (output) terminal 21 and a current output (input) terminal 22 will be formed, and both ends can be connected to a high-frequency power supply. When the coil 2 is loaded with a high-frequency power supply, the hysteresis loss and eddy current loss of the mold core 1 will be caused. , so that the temperature in the area close to the two heating surfaces 11 rises sharply. At this time, the gap of the coil guide hole 12 can be passed into the cooling liquid to cool the coil 2 in a conductive manner. Similarly, the cooling holes 13 of the mold core 1 are passed into low temperature. Liquid or low-temperature gas, use the temperature conduction effect to absorb high-frequency induction heating to generate additional heat, or cool the mold core 1 and the heating surface 11 during the solidification stage of the plastic, or by the temperature and flow rate of the liquid or gas passing into the cooling hole 13. Adjust the temperature of the heating surface 11 of the mold core 1; therefore, the utility model will enable the heating surface 11 to rise rapidly, so as to avoid the phenomenon of solidification due to the temperature drop when filling the thermoplastic material, which will make the thermoplastic material have better Fluidity can greatly improve product quality; in addition, please refer to Figure 3, which is a schematic diagram of another mold implementation.

Compared with other commonly used technologies, the high-frequency heating mold provided by the utility model has the following advantages:

1. The utility model can quickly increase the temperature of the mold heating surface to reduce the phenomenon of solidification caused by the temperature drop of the thermoplastic material during filling the mold cavity, and make it have better fluidity through heating, thereby greatly improving product quality.

2. The utility model circulates low-temperature liquid in the gap between the coil guide hole and the coil to cool the coil temperature and prevent the coil from being burned due to overheating due to current loading.

The mold of the utility model is suitable for mold manufacturing of general thermoplastic materials, such as injection molding, injection compression molding, compression molding, and hot pressing molding. Apply pressure to fill the plastic in the specific structure of the mold core, and then cool the plastic to complete the mold core structure replication. Applicable thermoplastic materials include plastic, glass, plastic or glass-based composite materials, etc.

The above detailed description is a specific description of a feasible embodiment of the utility model. This embodiment is not intended to limit the patent scope of the utility model. Any equivalent implementation or change that does not depart from the technical spirit of the utility model shall should be included in this patent application.

Claims (9)

1. A high-frequency heating mold, characterized in that, comprising: At least one mold core, the mold core has a heating surface, and at least one coil guide hole is penetrated on both sides of the heating surface, and at least one cooling hole is penetrated on both sides of the coil guide hole; at least one coil, which is inserted into the coil guide holes of the two cores; At least one coil connector, the coil connector is connected to each coil end of two adjacent mold cores. 2. The high-frequency heating mold according to claim 1, wherein a cooling liquid is passed through the coil guide hole. 3. The high-frequency heating mold according to claim 1, wherein a cooling liquid or a cooling gas is passed through the cooling hole. 4. The high-frequency heating mold according to claim 1, wherein the position and quantity of the cooling holes are arranged according to temperature control. 5. The high-frequency heating mold according to claim 1, wherein the surface of the coil is covered with an insulating material. 6. The high-frequency heating mold according to claim 1, wherein the coil is loaded with a high-frequency power supply. 7. The high-frequency heating mold according to claim 1, wherein the coil connector is connected in a detachable or telescopic or sliding connection. 8. The high-frequency heating mold according to claim 1, wherein the coil is connected as a whole by a coil connector. 9. The high-frequency heating mold according to claim 1, wherein the coil is connected as a whole by a coil connector, one of the two ends of the coil is a current input end, and the other end is a current output end.

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