KR900003286B1 - Heating method for mould and apparatus thereof - Google Patents

Abstract

In the heating method for mould, an object material is inserted, held and pressed on the surface of mould getting hotter on receiving heat from a heating device. The heating apparatus includes mould sheet (1) jointed with metal plate (2), concavity (3), magmet-field forming winding (4) covered by thermoplastic tape (5), heat-resistant cover (6).

Description

Heating method and apparatus for hot pressing die plate

1 is an exploded perspective view of a heating apparatus constructed by way of example according to the invention.

2 is a plan view of a heating plate exemplarily constructed in accordance with the present invention.

3 is an exploded perspective view of the main portion of the present invention.

4 is a cross-sectional view of a mold plate coupled state in which line A-A of FIG. 2 is extracted.

5 is a plan view of a conventional heating apparatus.

6 is a current diagram in accordance with the use of the present invention and the prior art.

* Explanation of symbols for main parts of the drawings

1: mold plate 2: metal plate

3: concave groove means 31: guide protrusion

32: connecting passage 4: winding body

41: connection part 42: hole

5: heat-resistant resin tape 6: protective plate

The present invention relates to a heating method and apparatus for a hot pressing die plate configured to conduct heat bonding by inserting and holding an adherend in an upper mold in a state where it receives heat from a heating device and is heated to a predetermined temperature.

The hot pressing mold plate (hereinafter referred to as a mold plate) is a device widely used in sneakers or various footwear and other heat bonding processes where the main body and the bottom plate are formed separately from each other and then heat bonded together. This is a thermally conductive metal plate in which the heat generator is installed in the lower portion is configured to constitute a mechanism of one independent function.

Looking at the heating method and apparatus of the conventional mold plate here, as shown in Figure 5, the metal plate is fixedly installed on the bottom surface of the mold plate with a fastening member such as a bolt having the same size and predetermined thickness as the mold plate (2 As heating wires 8 'are arranged in a suitable pattern inside'), when an external power source is input to heating wires 8 ', the heat is conducted to the upper mold plate through the metal plate 2' and It was to be heated by the thermostat (not shown) to maintain a predetermined temperature continuously.

However, as the heat generated from the heating wire 8 'is adopted as the indirect heating method in which the metal plate 2' is transferred to the mold plate using the heat conducting medium, firstly, the heat conduction efficiency is low and a lot of heat loss is generated. When the mold plate is to be heated to a predetermined temperature (about 300 ° C.), the heating temperature of the heating wire 8 'must be raised to about 800 ° C., thus enormous electric energy is used. Second, the heating wire (8') is used. ) One side of the metal plate that is in direct contact with) is heated to a fairly high temperature, which is almost proportional to it, and high heat is radiated to the worker who is working on the side of the mold. Of course, third, the temperature difference of each part of the metal plate (i.e., the area where the heating wire 8 'is located and the area where the heating element 8' is not) is quite severe, The percentage of defective work during the adhesion mothayeo uneven heat distribution in the mold plates there are various problems such as high conductivity, as represented as the mold plate on the upper side.

Accordingly, an object of the present invention is to solve the problems of the conventional indirect heating method as described above, and at the same time, greatly reducing the power consumption by the direct heating method, to uniformly heat distribution of the mold plate, and to minimize external heat generation It is to improve and improve the working environment.

In order to achieve the above object, at least one concave groove means is formed on the upper part of the metal plate, and the induction coil winding bodies are inserted and installed in the form of external insulation therein, and AC power is applied to each induction coil winding body. When the magnetic force lines generated from the induction coils act on the metal plate, the eddy currents, or eddy currents, which hinder the flow of the magnetic lines inside the plate are generated, and by the resistance (Eddy current loss) As the metal plate is directly heated, it is improved by a direct heating method that can conduct conductive heating of the upper mold plate.

This will be described in more detail based on the accompanying drawings as follows.

In forming the heating apparatus on the metal plate 2 which is installed through-coupling as a fastening member on the bottom surface of the mold plate 1 having the mold portion 11 on one side of the upper surface, the metal plate 2 as shown in FIGS. On the upper surface of the) is formed a concave groove means 3 of a predetermined size having a guide protrusion 31 in the center portion is arranged in a constant shape, and at the same time, a connecting passage 32 is formed between each concave groove means (3) It became. In addition, the induction coil has an outer shape similar to that of the groove and is wound at a lower height to have a hole 42 into which the guide protrusion 31 is inserted in the center, and is insulated and covered with a heat resistant resin tape 5. As the hull 4 is inserted into and installed in series with each other as a connecting portion 41 in each concave groove means 3, the winding body 4 is guided with a hole 42 and a guide in the concave groove means 3; Using the projection 31 was installed in the flow prevention form (see Figure 2).

In addition, the upper part of the winding body (4) is provided with a high temperature resistant asbestos protection plate (6) is provided to cover the protection to prevent damage when in contact with the bottom surface of the mold plate (1), the connection portion (located in the connection passage 32 ( 41) and the heat-resistant non-conducting tube (7) is inserted around the induction coil lead-in and lead-out to maintain a complete insulation state with the metal plate. At this time, the number of turns of the induction coil constituting the winding body 4 is usually about 50-100 times, and the coil is preferably formed of a copper single wire of about 1 mm in diameter.

Looking at the operating state of the present invention configured as described above are as follows.

When AC power is applied to the induction coil by using a plug attached to one side of the metal plate 2, current flows in the winding body 4 in the concave groove means 3 connected in series as the connection part 41, respectively. At this time, when an induction magnetic field is formed by changing the magnetic force lines around each of the windings 4, the metal plate 2 plays a resistance role while generating a vortex (aka: eddy current) that hinders the flow of the magnetic force lines in its own molecular structure. The heat generated by the vortex loss causes the metal plate 2 to be heated evenly and uniformly by the heat, and conducts to the mold plate 1 on the upper side of the cause of the low temperature heat at the same time, which also heats the temperature distribution uniformly. .

As described above, when power is supplied to the induction coil for a predetermined time, the metal plate 2 is heated to a considerable temperature, and the mold plate 1 is directly raised to a temperature set by a temperature controller (not shown). It continuously maintains a constant temperature by repeatedly repeating the operation of automatically supplying or cutting off power as required according to the temperature. Each of the windings 4 does not generate heat by itself but is adjacent to the metal plate 2. Since heat is received from the resin and rises to about 70-80%, the resin tape 5 and the non-conductor tube 7 which insulate the winding body and the induction coil must maintain perfect heat resistance to prevent thermal deformation or loss at high temperatures. There is no occurrence of electric shock caused by leakage of current to the metal plate (2) side.

In addition, each of the concave groove means 3 and the guide protrusion 31 and the winding body 4 to be inserted into the shape can be formed in various ways, such as a square body or a cylindrical body, the cylindrical cylinder is most preferable in processing.

And, Figure 6 is a current diagram consumed when using the apparatus according to the invention and the conventional apparatus obtained by repeated experiments, the mold plate of the present invention reaches the set temperature within a short time, after which the current is increased as time passes. Although it is lowered in the form of a secondary curve, the mold plate of the conventional apparatus is heated later and also does not fall below a certain value (about 13 A) as time passes, and thus a lot of power reduction effect (W = I ² R) is obtained.

The present invention constructed and operated as described above is an indirect heating method in which heating wires are arranged in a conventional metal plate in order to heat the mold plate 1 in a direct heating method by vortex loss in the metal plate 2 using an induction coil. As well as the simple and simplified installation configuration, it heats up faster than before, and consumes a small amount of current even after long-term use, thereby saving energy and reducing the manufacturing cost of the product. 2) Because its temperature does not rise above the set value, it maintains an extremely low temperature compared to the high heat of the conventional indirect heating method to prevent the risk of burns and fires in advance, thus providing workers with better working conditions, and mold plate. Since the whole temperature distribution in (1) is heated evenly, it is produced by excluding the defects caused by the temperature distribution difference as in the prior art. It probably has a prominent effect can improve.

Claims (4)

In heating the mold plate to a predetermined temperature using a metal plate which is mutually installed as a fastening member on the bottom surface of the mold plate, at least one concave groove means 3 is provided at predetermined positions on the upper surface of the metal plate 2, respectively. After the interconnection path 32 is formed in the through-connected state, each of the concave groove means 3 has an induction magnetic field forming winding body 4 in which a single wire induction coil is wound as much as a predetermined rotation means. 5) insulated and covered in the form of covering the heat-resistant protection plate (6) in the upper part and at the same time, in series connection installation as the connection portion 41 covered with mutual heat-resistant non-conducting tube (7), the winding body (4) A method of heating a press-molded plate, characterized in that the metal plate is directly heated by conduction heating of the mold plate as heat generated by the vortex loss that interrupts the flow of the induced magnetic field formed when the AC power is applied. 2. The concave groove means (3) according to claim 1, wherein the concave groove means (3) has a cylindrical shape that forms a guide protrusion (3l) in the center, and is similar to the outer shape of the winding body (4) to be inserted therein and the concave groove means. Simultaneously, the heating method of the hot pressing die plate, characterized in that coupled to the guide projections (31) using a hole (42) in the center. In forming the heating apparatus on the metal plate mutually coupled as a fastening member on the bottom surface of the mold plate, at least one concave groove means 3 having a predetermined width and depth is formed on the upper surface of the metal plate 2 through the interconnect passage 32. At the same time, a single wire induction coil having a predetermined diameter is wound up by a predetermined number and covered with a heat resistant resin tape (5), and a heat resistant protective plate (6) is interposed between the upper part and the bottom of the metal plate, and mutual insulation covering. The heating apparatus of the hot pressing die plate, characterized in that the coupling is configured as a winding body (4) for induction magnetic field formation inserted into each of the concave groove means in a connected state in series connection (41). 4. The concave groove means (3) according to claim 3, wherein the concave groove means (3) is formed in a cylindrical shape with a guide protrusion (31) at the center of the bottom surface, and the winding body (4) has the guide protrusion insertion hole (42) at the center thereof. Heating device of the hot pressing die plate, characterized in that formed in a cylindrical shape.

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