KR20070110991A - Die assembly - Google Patents

Abstract

A metal die is provided to maintain high temperature on each surface of metal mold plates comprising a cavity metal mold in order to injection mold a smooth-surface product by reciprocating a cooling metal mold plate in the space between a heating metal mold plate and a fixed plate using an opening and closing unit. A metal die comprises a heating metal mold plate(110), a cooling metal mold plate(120), a core metal mold(130), a moving unit(140), and an opening and closing unit. The front surface of the heating metal mold plate forms a part of a molding cavity, and has electric heaters(112) embedded inside. The cooling mold plate abuts or separates from the back surface of the heating mold plate, and has cooling channels(122) installed inside. The core metal mold interlocks with a cavity metal mold to form a cavity. The moving unit relatively moves the cavity and the core metal molds to expose the cavity. The opening and closing unit is installed between the heating and the cooling metal mold plates to contact or separate the cooling metal mold plate to/from the heating metal mold plate. The heating mold plate is fixed on a fixed plate(116) disposed opposite to the core metal mold. The cooling metal mold plate is reciprocated between the heating metal mold plate and the fixed plate by the opening and closing unit. At least two symmetrical opening and closing units are installed between the cooling metal mold plate and the fixed plate.

Description

Mold Device {DIE ASSEMBLY}

1 is a side cross-sectional view showing a conventional mold apparatus,

2 is a side cross-sectional view showing a first embodiment of a mold apparatus according to the present invention;

3 is a side cross-sectional view showing a second embodiment of a mold apparatus according to the present invention;

4 is a side cross-sectional view showing a third embodiment of a mold apparatus according to the present invention;

5 is a side view showing a fourth embodiment of a mold apparatus according to the present invention;

6 to 8 are side cross-sectional views showing various embodiments of the electric heater installation structure that can be applied to each embodiment of the mold apparatus according to the present invention.

<Explanation of symbols on main parts of the drawings>

110: heating mold plate 120: water cooling mold plate

122: electric heater 122h: buried groove

130: core mold 140: moving means

152: electromagnet 154: permanent magnet

The present invention relates to a mold apparatus in which injection molding is performed by inserting a molding material in a state in which a cavity mold and a core mold are engaged with each other, and in particular, in a cavity mold including a heating mold plate and a cooling mold plate, the cooling mold plate is relatively relative to the heating mold plate. The present invention relates to a mold apparatus that can be controlled to achieve cooling at a desired time point as well as reducing heat loss during injection molding.

As is well known, injection molding is one method of molding products made of synthetic resin, commonly referred to as plastic. In the injection molding, the molten resin is injected into the cavity of the mold formed in a predetermined shape, filled, cooled and hardened, thereby forming a product having the same shape as that of the cavity.

In general, most electronic products have a rough surface, even though their appearance is injection molded, so that they undergo a separate coating, coating, and glass coating process.

In this way, a cold mold has been developed that not only produces a beautiful surface of the injection product but also performs injection molding to prevent a complicated process, and then cools only the outer part of the mold and slowly cools the inner part. Although the strength could be increased, it is difficult to make the surface of the injection-molded product even when the high temperature molding material is initially injected, since the inner part of the mold in contact with the mold is kept at a low temperature.

Therefore, researches have been made on molding techniques for heating the mold instantaneously and rapidly cooling, and as a result, various high temperature molds have been developed.

The high temperature mold is configured so that the electric heater is embedded in a relatively small core mold inserted into the cavity, but it is difficult to make the surface of the molding material beautiful because the part contacting the core mold corresponds to the inner part of the molding material.

In addition, since the hot mold disclosed in Patent Application No. 1997-0062643 is configured to have a hot wire in the base mold for supporting the mold forming the cavity, it is time to heat the cavity to a high temperature before the hot molding material is injected into the mold. There is a problem that consumes a lot of power.

In addition, the high temperature mold disclosed in Patent Application Nos. 2000-55868, 2002-62528, while heating the core mold by the coil while heating the other mold to be engaged with the gas fuel flame, and then injection molding is made, Rapid cooling is achieved by high pressure air and / or cooling water, but it is difficult to make the surface of the injection molding difficult because it is difficult to heat the mold precisely to the injection molding material temperature by gas fuel flame, and furthermore, as gas fuel is used for safety reasons. There is a problem.

In addition, since the high temperature mold disclosed in Patent Application No. 2000-6600 is configured such that a heater is built in the manifold to prevent the molding material from hardening while being moved into the cavity, the surface of the injection molded product is not heated by heating the cavity directly contacted with the molding material. Forming expansion grooves to be connected to both sides of the buried groove where the heater is buried in the manifold, and then installing a pair of wires to prevent the heater from being removed. The addition of such a process not only complicates the process but also has a problem in that productivity is lowered.

Accordingly, many high temperature molds have been developed in which an electric heater is embedded in a mold forming the outer edge of the molding material and heated, and a cooling water channel is embedded in the mold in contact with the mold.

1 is a side cross-sectional view showing a conventional high temperature mold.

In the conventional high temperature mold, as shown in FIG. 1, the cavity mold plate 3 is detachably installed from the stationary mold 1, and the core mold plate 4 is detachably installed from the movable mold 2. Cooling water flow paths 1h and 2h are formed in the stationary mold 1 and the moving mold 2, and heaters 3a and 4a and a warm air flow path 3b are formed in the cavity mold plate 3 and the core mold plate 4. 4b) is built in.

Of course, the cavity mold plate 3 and the core mold plate 4 are engaged with each other to form a cavity space in which an injection molded product can be formed, and a molding material is injected into one of the fixed mold 1 or the moving mold 2. An injection passage (not shown) is formed to communicate with the cavity space.

Specifically, the cavity mold plate 3 is provided with a cavity support plate 5 and a spring 10 therebetween so as to be detachable from the stationary mold 1, wherein the cavity support plate 5 is the cavity mold plate ( It is installed to support the spring 10 to the fixed mold (1) while supporting the 3).

In addition, the core mold plate 8 is provided with a core support plate 8 and a spring 10 therebetween so as to be detachable from the movable mold 2, the core support plate 8 is the core mold plate 8 ) Is installed to support the spring 10 to the movable mold (2).

At this time, the movable mold 2 and the core support plate 8 is installed so that the guide pin 12 protrudes toward the fixed mold 1, and the fixed mold 1 and the cavity support plate 5 are A guide pin hole 13 into which the guide pin 12 is inserted is formed.

In addition, a moving device (not shown) such as a hydraulic device is connected to the fixed mold 1 so that the movable mold 2 can be contacted / separated, and the movable mold 2 is connected to the fixed mold ( 1), the cavity mold plate 3 and the core mold plate 4 are engaged with each other to compress the spring 10, while the cavity mold plate 3 is engaged with the stationary mold 1 The core mold plate 4 is engaged with the movable mold 2.

Looking at the process of manufacturing the injection molding in the mold apparatus as described above, the heater (3a, 4a) is operated, or flowing a high temperature fluid through the hot air flow path (3b, 4b) the cavity mold plate 3 and core The mold plate 4 is heated, but the cavity mold plate 3 and the core mold plate 4 are rapidly heated in a state in which the mold mold plate 4 and the core mold plate 4 are separated into the stationary mold 1 and the moving mold 2.

Thereafter, when the movable mold 2 is moved to the fixed mold 1, the guide pin 12 is fitted into the guide hole 13 to adjust the exact positions at which the molds are engaged, and the cavity mold plate 3. ) And the core mold plate 4 are engaged with each other so that the cavity support plate 5 and the core support plate 8 compress each spring 10.

At the same time, the cavity mold plate 3 is engaged with the stationary mold 1 and at the same time the core mold plate 4 is also engaged with the movable mold 2, and then a molding material is moved into the cavity space along the injection passage. Injection molding is performed, and cooling is rapidly performed while a cooling fluid flows through the cooling water flow paths 1h and 2h.

However, in the conventional mold apparatus as described above, the cavity mold plate 3 and the core mold plate 4 in which the heater is embedded are moved in contact with the stationary mold 1 and the movable mold 2 in which the cooling water flow path is formed. After the cavity mold plate 3 and the core mold plate 4 are heated, and the injection mold is made in contact with the stationary mold 1 and the moving mold 2, respectively, the cavity mold plate heated to a high temperature ( 3) and a heat loss is generated from the core mold plate 4 to the stationary mold 1 and the moving mold 2 in contact therewith, thereby forming one surface of the cavity mold plate 3 and the core mold plate forming the cavity space. One side of (4) is difficult to maintain the high temperature until the injection molding is completed, as a result there is a problem that the surface of the injection molding is difficult to process smoothly.

In addition, in the conventional mold apparatus, the cavity supporting plate 5 and the spring 10 are provided therebetween so that the cavity mold plate 3 can be separated from the stationary mold 1, and the core mold plate (from the moving mold 2) is installed. Since the core support plate 8 and the spring 10 are installed therebetween so that 4) is also removable, heaters 3a and 4a or hot air flow paths embedded in the cavity mold plate 3 and the core mold plate 4 are provided. As it is heated to a high temperature through the 3b, 4b) or the injection of a high-temperature molding material, not only thermal deformation can be made to the spring 10 which is installed in close proximity due to heat transfer, but also durability is low, and as a result, reliability of operation can be ensured. There is no problem.

In the conventional mold apparatus, the heaters 3a and 4a are embedded in the cavity mold plate 3 and the core mold plate 4, but detailed configurations are not shown. The heater is reliably embedded in the buried groove because the heater 10 having a circular cross section is press-fitted into the buried groove, or a cover having a rectangular cross section is fixed like a buried groove while the heater is inserted into the buried groove. Not only is it difficult to be fixed, there is a problem that the assembly process is difficult.

The present invention has been made to solve the above problems of the prior art, it is an object of the present invention to provide a mold apparatus capable of cooling at a desired time point as well as reducing the heat loss even when the mold is heated at a high temperature.

In addition, an object of the present invention is to provide a mold apparatus that can not only improve durability even at a high temperature, but also ensure operational reliability.

In addition, an object of the present invention is to improve the installation structure of the electric heater embedded in order to heat the mold, to provide a mold apparatus that can be fixed as well as simpler.

The mold apparatus according to the present invention for solving the above problems forms a part of the molding cavity on the front surface and the heating mold plate embedded electric heater therein; A water cooling mold plate having a water cooling channel therein while being able to contact or be spaced from the rear surface of the heating mold plate; A core mold engaged with the cavity mold to form a molding cavity; Moving means for relatively moving the cavity mold and the core mold to open and close the cavity; It is provided between the heating mold plate and the water-cooled mold plate is configured to include an opening and closing means for contacting or spaced apart from the water-cooled mold plate with respect to the heating mold plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a side sectional view showing a first embodiment of a mold apparatus according to the present invention.

As shown in FIG. 2, the mold apparatus according to the present invention engages with the cavity molds 110 and 120 provided with the water cooling mold plate 120 so as to be contacted / movable with respect to the heating mold plate 110. Consists of forming a core mold 130, the core mold 130 is in contact with the cavity mold (110, 120) by a moving means 140, such as a hydraulic device or a pneumatic device, while the heating mold plate ( The electromagnet 152 and the permanent magnet 154 are installed on the separating surface of the 110 and the water-cooled mold plate 120 so that the water-cooled mold plate 120 contacts / moves with respect to the heating mold plate 110.

Here, the water cooling mold plate 120, the heating mold plate 110, the core mold 130, the moving means 140 are installed side by side in the vertical direction.

In more detail, the heating mold plate 110 is formed in a cup shape in which a groove is formed so that the water-cooling mold plate 120 can be inserted in the center thereof, and the electric heater 112 which is a kind of heating means inside the lower end thereof. It is buried inside.

At this time, the heating mold plate 110 is installed so that both upper ends 114 are extended upward and also fixed to the fixing plate 116, the groove is formed at the lower end to engage the core mold 130 to form a cavity. do.

Next, the water cooling mold plate 120 is inserted from the upper side of the heating mold plate 110 is formed to be moved in the vertical direction from the inside, there is formed a cooling water channel 122 which is a kind of cooling means therein The heat-transfer member 124 is mounted to a portion in contact with the heating mold plate 110 to actively generate heat transfer.

Of course, the water-cooled mold plate 120 is not removed as it moves up and down in the groove side of the heating mold plate 110.

In addition, the heating mold plate 110 and the water-cooled mold plate 120 are formed so that the injection passage 115 through which the molding material is injected is in communication with the cavity, so that the injection holes into which the molding material is introduced into the cavity molds 110 and 120 are formed. do.

In particular, the electromagnet 152 and the permanent magnet 154 is installed to face each other on the separation surface of the heating mold plate 110 and the water-cooled mold plate 120, the electromagnet 152 and the permanent magnet 154 is A pair is installed to be symmetrical on both sides of the heating mold plate 110 and the water-cooled mold plate 120 to enhance the attraction and repulsive force.

Of course, the electromagnet 152 and the permanent magnet 154 may be installed to face the separation surface of the heating mold plate 110 and the water-cooled mold plate 120, but a pair of electromagnets may be installed. have.

Therefore, when an electric current is supplied to the electromagnet 152 according to an external signal, and thus the electromagnet 152 and the permanent magnet 154 have the same pole, repulsive force acts while cooling the water from the heating mold plate 110. While the mold plate 120 is moved upward and separated, when the electromagnet 152 and the permanent magnet 154 have different poles, the water-cooled mold plate 120 is moved downward while the attraction force is applied to the heating mold plate. Is operated to contact 110.

At this time, although the repulsive force is required between the electromagnet 152 and the permanent magnet 154 in order to separate the water-cooled mold plate 120 from the heating mold plate 110, the water-cooled plate 110 is water-cooled. Even if there is no attraction between the electromagnet 152 and the permanent magnet 154 so that the mold plate 120 is in contact with each other, the cooling die plate 120 falls to the heating mold plate 110 side by gravity to contact each other. It can also work.

Referring to the operation of the first embodiment of the mold apparatus as described above, the water-cooled mold plate 120 is separated from the heating mold plate 110 by supplying a current to the electromagnet 152 such that an external signal generates repulsive force. Then, the heating die plate 120 is heated by supplying a current to the electric heater 112, and then the moving means 140 is operated to contact the core mold 130 with the cavity molds 110 and 120. .

Of course, since the heating mold plate 110 and the water-cooled mold plate 120 are kept separated from each other to prevent heat transfer from the heating mold plate 110 to the water-cooled mold plate 120, as a result The thermal efficiency can be improved more.

At this time, the cavity is formed between the heating mold plate 120 and the core mold 130, and then a molding material is filled in the cavity through the injection passage 115 while maintaining the state.

Thereafter, the electric current supplied to the electric heater 112 is stopped and the attraction force is generated between the electromagnet 152 and the permanent magnet 154 so that the water-cooled mold plate 120 is connected to the heating mold plate 110. And the water cooling mold plate 120, the heating mold plate 110, and the injection molded product are cooled while the cooling water is supplied through the cooling water channel 122, and the cavity molds 110 and 120 are moved by the moving means 140. The core mold 130 may be separated from the injection molding.

3 is a side sectional view showing a second embodiment of a mold apparatus according to the present invention.

The second embodiment of the mold apparatus according to the present invention is configured in the same manner as the first embodiment, the fixed plate 116 and the water-cooled mold plate 120 is fixed to the heating mold plate 110 as shown in FIG. The guide 162 is installed between the upper and lower sides, and the servo motor 164 is connected to drive the guide 162 so that the water-cooled mold plate 120 contacts / moves from the heating mold plate 110. Is installed.

Of course, the water-cooled mold plate 110 is inserted from the upper side of the heating mold plate 120, the heating mold plate 120 is fixed at both ends 114 of the upper fixing plate 116, then The water-cooled mold plate 110 is configured to move up and down in the upper groove of the heating mold plate 120.

At this time, both ends of the guide 162 are installed to be rotatable to the heating mold plate 110 and the water cooling mold plate 120, the upper end of the guide 162 is rotatably constrained to the fixed plate 116 On the other hand, as the lower end of the guide 162 is rotated in the water-cooled mold plate 120, the water-cooled mold plate 120 is installed to move in the vertical direction.

In addition, the servo motor 164 is configured to rotate the guide 162 in both directions, the operation is controlled by a separate external signal.

Of course, the second embodiment can accurately control the movement of the water-cooled mold 120 as the servo motor 164 that can follow the correct position and speed according to an external signal is applied.

Referring to the operation of the second embodiment of the mold apparatus as described above, the servo motor 164 operates the guide 162 in one direction according to an external signal while the water-cooled mold plate 120 is moved from the heating mold plate 110. To separate while moving upward, and to heat the heating mold plate 110 by supplying a current to the electric heater 112, and then operating the moving means 140 to move the core mold 130 to the cavity mold. Contact (110,120).

At this time, the cavity is formed between the heating mold plate 110 and the core mold 130, and then filling a molding material in the cavity through the injection passage 115 while maintaining the state, the heating mold plate ( Since heat transfer from the 110 to the water-cooled mold plate 120 is not made, heat loss can be prevented to increase heat transfer efficiency.

Thereafter, the current supplied to the electric heater 112 is stopped, and the servo motor 164 operates the guide 162 in a different direction according to an external signal, and the water cooling mold 110 is applied to the heating mold plate 110. After contacting the plate 120, the cooling water is supplied through the cooling water channel 122 to allow the water cooling mold plate 120, the heating mold plate 110, and the injection molded product to be cooled, and by the moving means 140. The core mold 130 may be separated from the cavity molds 110 and 120, and an injection material may be taken out.

Figure 4 is a side sectional view showing a third embodiment of a mold apparatus according to the present invention.

The third embodiment of the mold apparatus according to the present invention is configured in the same manner as the first embodiment, as shown in Figure 4, the fixed plate 116 and the water-cooled mold plate 120 is fixed to the heating mold plate 110 A guide 172 is installed between the upper and lower sides, and the hydraulic or pneumatic apparatus 174 drives the guide 172 to contact / move the water-cooled mold plate 120 from the heating mold plate 110. ) Is installed connected.

Of course, the water-cooled mold plate 110 is inserted from the upper side of the heating mold plate 120, the heating mold plate 120 is fixed at both ends 114 of the upper fixing plate 116, then The water-cooled mold plate 110 is configured to move up and down in the upper groove of the heating mold plate 120.

At this time, the guide 172 is installed so that both ends are fixed to the fixed plate 116 and the water-cooled mold plate 120 of the heating mold plate 110 side, composed of a kind of hydraulic cylinder or pneumatic cylinder the oil / pneumatic device The length is changed in the vertical direction in accordance with the pressure supplied from the (174), and thus the water-cooled mold plate 120 is installed to move in the vertical direction with respect to the fixed heating mold plate 110.

In addition, the oil / pneumatic device 174 is configured to adjust the oil / pneumatic pressure supplied to the guide 172, the operation is controlled by a separate external signal.

Of course, according to the third embodiment, the oil / pneumatic device 174, which can adjust the oil / pneumatic degree according to an external signal, is applied to control the movement of the water-cooled mold plate 120 accurately. Can be.

Referring to the operation of the third embodiment of the mold apparatus as described above, the oil / pneumatic device 174 is extended as the oil / pneumatic device 174 is supplied to the guide 172 according to an external signal from the heating mold plate 110. The water-cooled mold plate 120 is separated, and the electric mold 112 is heated so that a current is supplied to the electric heater 112, and then the moving means 140 is operated to operate the core mold 130. Contact the cavity molds 110 and 120.

At this time, the cavity is formed between the water-cooled mold plate 120 and the core mold 130, and then filling a molding material in the cavity through the injection passage 115 while maintaining the state, the heating mold plate ( Since heat transfer from the 110 to the water-cooled mold plate 120 is not made, heat loss can be prevented to increase heat transfer efficiency.

Thereafter, the electric current supplied to the electric heater 112 is stopped, and the heating / mould is reduced as the oil / pneumatic device 174 recovers oil / pneumatic to the guide 172 according to an external signal. The water-cooled mold plate 120 is brought into contact with 110 and then the cooling water is supplied through the cooling water channel 122 to cool the water-cooled mold plate 120, the heating mold plate 110, and the injection molding product. The core mold 130 may be separated from the cavity molds 110 and 120 by the means 140, and an injection molded product may be taken out.

5 is a side view showing a fourth embodiment of a mold apparatus according to the present invention.

The fourth embodiment of the mold apparatus according to the present invention is configured in the same manner as the first embodiment, the multi-stage circular gear 182 is installed so as to engage both sides of the water-cooled mold plate 120 as shown in FIG. At the same time, a guide gear 184 having a gear tooth formed in a longitudinal direction to be engaged with the gear 182 is installed, and the heating mold so that the water cooling mold plate 120 is separated from the heating mold plate 110 by elastic repulsive force. Spring 186 is installed in the vertical direction between the plate 110 and the water-cooled flat plate 120, the gear 182 is configured to be connected to a separate drive device to be rotated by an external signal.

Of course, the water-cooled mold plate 120 is inserted from the upper side of the heating mold plate 110, the heating mold plate 110 is fixed at both ends 114 of the upper fixing plate 116, then The water-cooled mold plate 120 is configured to move in the vertical direction in the groove formed from the upper side of the heating mold plate 110.

In more detail, the groove formed from the upper side of the heating mold plate 110 is also opened in the front-rear direction, and the predetermined gear teeth 120a are formed in both the front and rear ends of the water-cooled mold plate 120 in the vertical direction. The gear 182 is engaged with both gear teeth 120a of the water-cooled flat plate so as to be movable upward and downward, and the guide gear 184 is installed to engage with the gear 182 to be fixed.

At this time, according to an external signal is applied to the driving device connected to adjust the degree of rotation of the gear 182 can accurately control the movement of the water-cooled mold plate 120, the gear 184 is configured in multiple stages To control the transmission of the driving force.

Of course, the guide gear 184 is fixed, and as the gear 182 is rotated, the gear 182 and the water-cooled mold plate 120 is moved together in the vertical direction.

Referring to the operation of the fourth embodiment of the mold apparatus as described above, the water cooling die plate 120 meshed with the driving gear rotates the gear 182 according to an external signal. While moving upward, the water-cooled mold plate 120 is separated from the heating mold plate 110, and a current is supplied to the electric heater 112 to heat the heating mold plate 110, and then the moving means. 140 operates the core mold 130 to contact the cavity molds 110 and 120.

At this time, the cavity is formed between the water-cooled mold plate 120 and the core mold 130, and then filling a molding material in the cavity through the injection passage 115 while maintaining the state, the heating mold plate ( Since heat transfer from the 110 to the water-cooled mold plate 120 is not made, heat loss can be prevented to increase heat transfer efficiency.

Thereafter, the current supplied to the electric heater 112 is stopped, and the gear unit 182 and the water-cooled mold plate engaged with the gear unit 182 while supplying rotational force in the opposite direction to the gear 182 according to an external signal. 120 is moved downward along the guide gear 184, so that the water-cooled mold plate 120 is in contact with the heating mold plate 110 while compressing the spring (186).

Next, while the cooling water is supplied through the cooling water channel 122, the water cooling mold plate 120, the heating mold plate 110, and the injection molding product are cooled, and the moving means 140 is removed from the cavity molds 110 and 120. The core mold 130 may be separated and the injection molding may be withdrawn.

Of course, the driving device also stops the rotational force supply to the gear 182 so that the gear 182 and the water-cooled mold plate 120 engaged therewith are upward from the heating mold plate 110 by the repulsive force of the spring 186. Allow it to move apart.

6 to 8 are side cross-sectional views showing various embodiments of the electric heater installation structure that can be applied to each embodiment of the mold apparatus according to the present invention.

In the first embodiment of the electric heater installation structure that can be applied to the mold apparatus of the present invention, the electric heater 112 having a circular cross section is inserted into a buried groove formed in the heating mold plate 110 as shown in FIG. In order to prevent the electric heater 112 from being removed, the heater shield 118 is installed in a space other than the installation portion of the electric heater 112 in the buried groove 112h.

Here, the electric heater 112 is a hot wire, and in order to increase the heat transfer effect, the heat transfer fluid having high heat transfer efficiency is coated on the outer circumferential surface thereof to form the heat transfer film 112a.

At this time, the buried groove (112h) has a depth that is formed deeper than the diameter of the electric heater 112, the width is formed to be the same as the diameter of the electric heater 112, the bottom surface of the electric It is formed to correspond to the bottom surface of the heater (112).

Next, the heater shield 118 is formed at the lower end of the hemispherical groove shape corresponding to the space between the electric heater 112 and the buried groove, which is formed by the electric heater 112 is inserted into the buried groove (112h), Its upper end is formed in a flat shape to form the same plane as the upper surface of the heating mold plate 110, it is preferably made of a heat transfer material of high heat transfer efficiency.

Of course, the electric heater 112 may be formed in a variety of shapes, depending on the shape of the electric heater 112, the shape of the buried groove 112h and the heater shield 118 may be changed.

Therefore, the electric heater 112 is seated in the buried groove (112h), the heater shield 118 is pressed in to fill the buried groove (112h) to cover the electric heater 112, the electric The heater 112 is installed to be wrapped in the buried groove 112h and the heater shield 118 is not easily removed.

Although the first embodiment of the electric heater installation structure as described above is limited to being installed in the heating mold plate 110, the cooling mold plate 120 and the core mold 130 may be installed. Other examples below apply equally.

The second embodiment of the electric heater installation structure that can be applied to the mold apparatus of the present invention is formed in the same manner as the first embodiment of the electric heater installation structure, buried in the heating die plate 110 as shown in FIG. The electric heater 112 having a circular cross section is inserted into the groove 112h, and the heat transfer powder 119 is inserted into the buried groove 112h to prevent the electric heater 112 from being removed. The electric heater 112 is molded to fill the space by the heat to form a sealing member.

Similarly, since the buried groove 112h and the electric heater 112 are configured in the same manner as in the first embodiment, detailed description thereof will be omitted.

At this time, the sealing member is manufactured to melt and solidify as heat is applied to the heat transfer powder 119 of thermoplastic material, the lower end of which is engaged with the upper end of the electric heater 112 and the upper end of the heating mold plate ( It is installed to form the same plane as the upper surface of 110.

Therefore, the electric heater 112 is seated in the embedding groove (112h), the heat transfer powder 118 is embedded in the embedding groove (112h) in which the electric heater 112 is embedded the electric heater ( 112 is operated and heated, and the heat transfer powder 118 is melted and melted and fixed in a shape fitted between the electric heater 112 and the buried groove 112h so that the electric heater 112 is not easily removed. do.

In the third embodiment of the electric heater mounting structure that can be applied to the mold apparatus of the present invention, as shown in FIG. 8, the heating mold plate 110 is divided into two members 110A and 110B in the thickness direction, and the heating is performed. Buried grooves 112h and 112h 'are formed between the two members 110A and 110B of the mold plate so as to face each other on separate surfaces, and the electric heater 112 is engaged with the buried grooves 112h and 112h'. The two members 110A and 110B of the separation mold plate are screwed together or welded to each other.

Of course, the electric heater 112 is composed of a hot wire having a circular cross section, the coating is made of a material having high heat transfer efficiency on the outer peripheral surface.

At this time, as the cross section of the electric heater 112 is formed in a circular shape, each of the buried grooves 112h and 112h 'on the two member sides is also formed in a semicircle so as to be engaged with the electric heater 112, the electric heater 112 ), Each of the buried grooves 112h and 112h 'on the two member sides is also determined in the shape thereof.

That is, the electric heater 112 is fitted into each of the buried grooves (112h, 112h ') of the two members side, and then the two members (110A, 110B) of the separation mold plate is assembled and fixed to engage with each other, the two members As the outer periphery of the electric heater 112 is tightly fixed to each of the buried grooves 112h and 112h 'on the side, the electric heater 112 can be installed more easily and firmly.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

Since the mold apparatus according to the present invention configured as described above is configured such that the cavity mold engaged with the core mold can be moved from the heating mold plate to the water-cooled mold plate, the molding material is injected into the cavity formed by engaging the heating mold plate and the core mold to be injected. Even if the molding is carried out, the heat loss from the high temperature heating mold plate to the low temperature water cooling mold plate does not occur. Therefore, one surface of each mold forming the cavity can be maintained at a high temperature, so that the surface of the injection molded product can be made smoothly. Furthermore, there is an advantage that can be implemented at a desired time to implement a more diverse manufacturing process.

In addition, the mold apparatus according to the present invention is a cavity mold consisting of a heating mold plate and a water-cooled mold plate, between the heating mold plate and the water-cooled mold plate, electromagnets and permanent magnets, guides and servomotors, guides and oil / pneumatic devices, various gears It is possible to contact / move the water-cooled mold plate from the heating mold plate according to an external signal by installing a lamp, etc. And there is an advantage that can further improve the operation reliability.

In addition, since the mold apparatus according to the present invention forms an embedding groove in the mold side so that one end of the electric heater is engaged, and inserts a heater shield into the embedding groove to surround the other end of the electric heater, or fill the heat transfer powder to melt and solidify There is an advantage that the electric heater can be more stably fixed, and furthermore, the mold is divided in the thickness direction, and each embedding groove is formed in the opposing part so as to assemble the two members of the mold and to seat the electric heater at the same time. Not only is this simple, it can be reduced to increase productivity.

Claims (16)

A heating mold plate which forms a part of the molding cavity on the front surface and has an electric heater embedded therein; A water cooling mold plate having a water cooling channel therein while being able to contact or be spaced from the rear surface of the heating mold plate; A core mold engaged with the cavity mold to form a molding cavity; Moving means for relatively moving the cavity mold and the core mold to open and close the cavity; And an opening and closing means installed between the heating mold plate and the water cooling mold plate so as to contact or space the water cooling mold plate with respect to the heating mold plate. The method of claim 1, The heating mold plate is fixed to a fixed plate located opposite the core mold, wherein the water-cooled mold plate is reciprocating by the opening and closing means in the space between the heating mold plate and the fixed plate. The method of claim 2, The opening and closing means is a mold apparatus, characterized in that at least two or more are installed symmetrically between the water-cooled mold plate and the fixed plate. The method of claim 2, The opening and closing means is a mold apparatus characterized in that it comprises a permanent magnet fixed to any one of the separation surface of the water-cooled mold plate and the fixed plate, and an electromagnet fixed to the other of the separation surface of the water-cooled mold plate and the fixed plate. . The method of claim 2, The opening and closing means is a mold apparatus characterized in that it comprises a guide connected between the water-cooled mold plate and the separating surface of the fixed plate, and a sub-motor for supplying rotational force to the guide. The method of claim 2, The opening and closing means is a mold apparatus characterized in that it comprises a guide connected between the water cooling die plate and the separation surface of the fixed plate and a hydraulic / pneumatic device for supplying the hydraulic / pneumatic to the guide. The method according to any one of claims 1 to 6, The heating die plate and the water-cooled die plate mold apparatus, characterized in that it comprises an injection hole for injection of the molding material into the molding cavity. The method according to any one of claims 1 to 6, The electric heater is embedded in a buried groove formed in a shape corresponding to the separation surface of the heating die plate, the high temperature mold, characterized in that the sealing member for preventing the removal of the electric heater is installed in the buried groove in which the electric heater is embedded. . The method of claim 8, High temperature mold, characterized in that the outer circumferential surface of the electric heater is coated with a heat transfer fluid of high heat transfer efficiency. The method of claim 8, The sealing member is a high temperature mold, characterized in that the heater shield having a shape corresponding to the space between the electric heater and the embedding groove generated by the electric heater is inserted into the embedding groove. The method of claim 10, High temperature mold, characterized in that the bottom surface of the heater shield has a shape corresponding to one surface of the electric heater. The method of claim 11, The high temperature mold, characterized in that the upper surface of the heater shield is formed to have a plane continuous with the back surface of the heating mold plate. The method of claim 8, The sealing member is a high-temperature mold, characterized in that the heat transfer powder is filled to fill the space between the electric heater and the embedding groove formed by the electric heater is inserted into the embedding groove to fill the space by the heat of the electric heater. The method of claim 13, The high temperature mold, characterized in that the upper surface of the formed heat transfer powder is formed to have a plane continuous with the back surface of the heating mold plate. The method of claim 8, The separation mold plate is divided into two members in the thickness direction, the high temperature mold, characterized in that the electric heater is embedded in the buried groove formed to face each other on the separation surface of the two members. The method of claim 15, The buried groove of the two members, the high temperature mold, characterized in that in close contact with the outer of the electric heater in the coupled state of the two members.

Images