JP4973350B2 - Mold assembly - Google Patents

Description

  The present invention relates to a mold assembly.

  In recent years, in order to meet demands for weight reduction and functionality improvement of molded products, the molded products have been made thinner and larger. In particular, in the injection molding technique, a molded article having a desired shape must be formed by flowing a molten thermoplastic resin in a thin cavity, and various studies described below have been made.

  One of them is a method of increasing the fluidity in the cavity by reducing the viscosity of the thermoplastic resin as the molding material. Specifically, studies have been made to fill a thin cavity by reducing the molecular weight of a thermoplastic resin or increasing the resin temperature. However, when the molecular weight of the thermoplastic resin is lowered, the strength of the thermoplastic resin is insufficient, and thus there is a risk of damage during use of the molded product. Further, when the resin temperature is increased, the thermoplastic resin is decomposed by heat, which may cause discoloration or strength reduction.

  Another method is to increase the injection rate of the injection molding machine, i.e., to increase the injection speed and mold. That is, by performing injection molding using an injection molding machine having an injection rate of about 5 to 20 times that of conventional injection molding machines, an appropriate thermoplastic resin can be used for molded products having a certain thickness and size. In combination with the above, it has become possible to mold a molded product that could not be molded conventionally. However, since the injection speed of the molten thermoplastic resin into the cavity is very fast and the injection pressure is high, stress may remain in the molded product or the molded product may be warped. Further, if the injection rate is too high, there is a problem that the molded product is burnt due to shearing. Furthermore, the injection molding machine itself is very expensive.

As a further alternative, the mold temperature, leave increased to near the glass transition temperature T _g of the thermoplastic resin used, by suppressing the cooling of the thermoplastic resin cavity, the thermoplastic resin in the cavity A method of facilitating filling, a method of intentionally changing the mold temperature during one molding cycle, specifically, the surface forming the mold cavity during the injection of molten thermoplastic resin into the cavity (For convenience, the temperature of the mold cavity surface) is set to, for example, a temperature _{equal to} or higher than T _g , and after completion of injection, the temperature of the mold cavity surface is cooled to a temperature lower than T _g and then the molded product is taken out. Can be mentioned.

  Here, as a method of intentionally changing the mold temperature, there is a method of replacing steam and water, which are heat media for heating and cooling the mold. However, in this method, since the temperature of the entire cavity surface of the mold is controlled by the heat medium, there is a problem that the molding cycle becomes long, and there is a limitation due to the vapor pressure and the buffer amount of the heat medium. It is the limit to raise the temperature of the entire cavity surface of the mold to 150 ° C.

  Other methods for intentionally changing the mold temperature are known from, for example, Japanese Patent Laid-Open Nos. 4-265720, 8-90624, 8-132500, 2004-528777, and 2004-42601.

  In the techniques disclosed in these patent publications, a thin electric conductive layer or electric resistance layer is formed on the cavity surface of the mold, or a stamper is placed on the cavity surface of the mold, and these These electric conductive layers and the like are heated by passing a current through the electric conductive layer, electric resistance layer, or stamper (hereinafter collectively referred to as an electric conductive layer or the like). And thereby, temperature control of the electrically conductive layer etc. which are the part which the molten thermoplastic resin which flows through the inside of a cavity contacts, and fluidity | liquidity control of molten thermoplastic resin can be performed. Since a current flows through the electrically conductive layer or the like, a thin electrical insulating layer is formed on the cavity surface of the mold below the electrically conductive layer or the like.

JP-A-4-265720 JP-A-8-90624 JP-A-8-132500 Special table 2004-528677 JP 2004-42601 A

  By the way, in the techniques disclosed in these patent publications, when the energization to the electrically conductive layer is stopped, a thin electrically insulating layer is formed between the cavity surface of the metal mold and the electrically conductive layer. Since only is formed, the electrically conductive layer or the like starts to be cooled instantaneously. As a result, the molten thermoplastic resin injected into the cavity is rapidly cooled, and appearance defects such as weld marks and flow marks are likely to occur in the molded product, and a solidified layer is formed in the molten thermoplastic resin, resulting in a molded product. There is a problem that distortion tends to occur inside.

  For example, in a method of providing an electric resistance layer having a high electric resistance value, a high electric voltage is used as a power source, and the temperature is increased by the resistance heat generation. It is necessary to form an electric resistance layer having a pattern. In the method of providing an electric resistance layer having a low electric resistance value, since a low voltage is used, there is a possibility that sufficient heat generation does not occur depending on the design of the electric resistance layer to be used. For example, in the technique disclosed in Japanese Patent Application Laid-Open No. 2004-42601, the calculation result from the electric resistance values of the power source and the stamper used hardly raises the temperature.

  Also, in order to increase the temperature rise rate and temperature rise rate of the electrically conductive layer, it is necessary to pass a large current through the electrically conductive layer or the like, and to efficiently provide a heat insulating layer or an insulating layer. It is necessary to take measures for energizing the layers and the like securely and safely, but these patent publications do not specifically disclose such means.

  Accordingly, an object of the present invention is to control the temperature of the molten thermoplastic resin injected into the cavity easily, in a short time, accurately, reliably, and safely, and to inject into the cavity. Another object of the present invention is to provide a mold assembly capable of controlling the cooling of the molten thermoplastic resin.

In order to achieve the above object, a mold assembly of the present invention comprises:
(A) A mold that includes a first mold part and a second mold part, and in which a cavity is formed by clamping the first mold part and the second mold part,
(B) a nesting assembly having a nesting disposed in the first mold part; and
(C) a first electrode and a second electrode;
A mold assembly comprising:
Nesting is
(B-1) nested body, and
(B-2) an insulating layer formed on the top surface of the nested body facing the cavity;
Consists of
The nested assembly is further
(B-1) A heating member that is electrically connected to the first electrode and the second electrode, is fixed on the insulating layer, forms part of the cavity, and generates Joule heat;
It is comprised from these.

  In the mold assembly of the present invention, a cavity for controlling the flow of current in the heat generating member may be provided inside the heat generating member. Thus, since the thickness of the heat generating member is partially reduced by providing the cavity in the heat generating member, the electric resistance value of the portion provided with the cavity is increased, resulting in an increase in current density and an increase in the heat generating member. It becomes easy to warm. It should be noted that air may flow through the cavity as desired, or communication with the outside may be blocked.

  Alternatively, in the mold assembly of the present invention, a flow path for cooling the heat generating member by flowing a cooling medium may be provided inside the heat generating member. As the cooling medium, water having high specific heat or high latent heat is suitable, and in terms of temperature, water at ordinary temperature may be used in consideration of cost, or hot water in which the mold is temperature-controlled can be used. If the flow rate of the cooling medium is at least 0.5 liter / min or more, a sufficiently high cooling rate can be achieved. Further, the cooling rate can be further improved by increasing the coolant flow rate using a pressurizing pump or the like. If the flow path for flowing the cooling medium is not provided, the heating current is turned off and cooling by heat transfer is started. However, when the cooling medium is flowed, for example, an electromagnetic valve is disposed in the pipe connected to the flow path, By opening the valve, the cooling medium can flow in the flow path. As the introduced cooling medium flows in the flow path, the heat of the heat generating member can be reliably and quickly taken away, so that the cooling rate is increased by 5 times or more compared with the case where no cooling medium is used. Is possible. When the heating member reaches the set temperature due to cooling, the electromagnetic valve is closed, the air valve is opened, air is blown, the inside of the flow path is purged, and the process proceeds to the next molding cycle.

Here, the width and height of the cavity or flow path (hereinafter, these may be collectively referred to as “cavity etc.”) are the relationship between the thickness and strength of the part of the heat generating member provided with the cavity etc. Therefore, it is preferable to determine as follows. That is, it is designed such that the minimum remaining thickness (t ₂ ) on the side facing the cavity of the heat generating member (referred to as the cavity surface side) is 1 to 10 mm, and the width (w ₁ ) of the cavity or the like is w _1. By designing so as to satisfy the relationship of ≦ 2 · t ₂ , it is possible to prevent the heat generating member from being deformed by the pressure of the molten thermoplastic resin injected into the cavity. Specifically, for example, when t ₂ = 2 mm, w _{1 is set} to 4 mm or less. Further, when the thickness of the heat generating member is t ₁ , and the shortest distance between adjacent cavities and the like is w ₂ , t ₁ is preferably 0.1 mm to 20 mm as described later, and w ₂ is It is desirable that it is 1 mm or more. In addition, when a plurality of cavities and the like are juxtaposed, the pitch of the cavities is designed so that the shortest distance (w ₂ ) between adjacent cavities and the like is 1 mm or more, so that the strength of the heating member Can be secured. In addition, since an electrical resistance value can be changed by intentionally changing the pitch, it is possible to change the rate of temperature increase. Moreover, it is also possible to change the heating rate by changing the height of the cavity or the like.

  Examples of projected shapes such as cavities include linear shapes, lattice shapes, spiral shapes, spiral shapes, partially connected concentric shapes, and zigzag shapes. In addition, examples of the cross-sectional shape such as a cavity include a rectangle, a circle, an ellipse, a trapezoid, and a polygon. From the standpoint of retaining the strength of the heat generating member, it is preferable to round the corners such as cavities, thereby avoiding stress concentration.

  As a method for forming a cavity or the like, a method of forming a cavity or the like formed by a groove or a through hole by performing NC machining or electric discharge machining on a heat generating member can be mentioned, or a molten metal using a laser modeling method A method of stacking the heat generating member on the heat generating member can be given. For example, in order to manufacture a heat generating member having a thickness of 5 mm provided with a cavity or the like, two 2.5 mm plates are used, and a cavity or the like of a desired size (for example, a groove) is NC processed on each plate. After forming, the two plate materials are arc welded, diffusion welded, silver brazing adhesive, high temperature fusion, bolts in a state where the convex portions and the convex portions on the opposing surfaces of the two plate materials are combined with the concave portions and the concave portions. What is necessary is just to stick together by fastening etc. If an O-ring seal or the like is provided at the outer edge of the heat generating member, the cavity or the like does not communicate with the outside. The inside of the outer edge portion of the heat generating member may be joined or may not be joined. In the latter case, the electric resistance value of the part that is not particularly joined becomes high, and therefore the temperature increase rate can be further improved.

  When introducing the cooling medium into the flow path, it is preferable to provide ports so that at least two pipes for introducing and discharging the cooling medium can be connected when the flow path is manufactured. In addition, when a plurality of flow paths are arranged in parallel, a manifold having a cross-sectional area larger than the total cross-sectional area of the flow paths is introduced to the flow paths in order to introduce the cooling medium uniformly into these flow paths. It is preferable to arrange at the inlet. Furthermore, in order to flow the cooling medium uniformly in the flow path, it is preferable to reduce the pipe diameter on the discharge part side of the flow path or to reduce the cross-sectional area of the manifold disposed at the outlet part of the flow path. As a result, the heat generating member can be cooled more uniformly. In addition, when the inner side of the outer edge portion of the heat generating member is not joined, the cooling medium flows through a small gap, so that the entire heat generating member can be cooled more uniformly. It should be noted that the outer edge of the heat generating member needs to be securely sealed with an O-ring seal or the like so that the cooling medium does not leak.

  In the mold assembly of the present invention, the heat generating member and the first electrode are directly connected using an insulating bolt or a conductive bolt, and the heat generating member and the second electrode are insulated. Can be directly connected using a bolt or a conductive bolt, and as described below, the heating member and the first electrode are indirectly connected using the first conductive means, The heat generating member and the second electrode can also be indirectly connected using the second conductive means. In addition, when the heat generating member and the first electrode or the second electrode are directly connected using a bolt, if a conductive bolt is used, current leakage from the conductive bolt occurs, and the efficiency is increased. May decrease. Therefore, in such a case, it is preferable to use an insulating bolt, or to provide an insulating coating on the surface of the conductive bolt, or to provide insulation by using the conductive bolt together with the insulating tape material. .

In the mold assembly of the present invention including the above preferred form, the nesting assembly further comprises:
(B-2) It has a first end and a second end, is disposed inside the nest, penetrates through the insulating layer, and the heat generating member and the first end are in contact with each other. First conductive means for passing current; and
(B-3) having a first end and a second end, disposed inside the insert, penetrating the insulating layer and contacting the heat generating member and the first end; A second conductive means for passing current;
Have
The first electrode is in contact with the exposed second end of the first conductive means;
The second electrode is in contact with the exposed second end of the second conductive means;
The heating member may be configured to be electrically connected to the first electrode via the first conductive means and electrically connected to the second electrode via the second conductive means. it can. For convenience, the mold assembly of the present invention having such a configuration is referred to as a “mold assembly of the first configuration”.

Alternatively, in the mold assembly of the present invention including the above preferred form, the nesting is further performed.
(B-3) a first conduction region, a second conduction region, and a conduction region extending portion connecting the first conduction region and the second conduction region formed on the insulating layer;
Consists of
The heat generating member is fixed on the insulating layer, the first conduction region, the conduction region extension portion, and the second conduction region, and constitutes a part of the cavity. The first conduction region, the conduction region extension portion, and the first conduction region Heated by Joule heat generated in two conduction regions and Joule heat generated in itself,
The nested assembly is further
(B-2) It has a first end and a second end, is arranged inside the nest, the first conduction region and the first end are in contact, and the first conduction region First conductive means for passing current; and
(B-3) It has a first end portion and a second end portion, is arranged inside the nest, the second conduction region and the first end portion are in contact, and the second conduction region A second conductive means for passing current;
Have
The first electrode is in contact with the exposed second end of the first conductive means;
The second electrode is in contact with the exposed second end of the second conductive means;
The heating member may be configured to be electrically connected to the first electrode via the first conductive means and electrically connected to the second electrode via the second conductive means. it can. For convenience, the mold assembly of the present invention having such a configuration is referred to as a “second configuration mold assembly”.

Here, in the mold assembly of the second configuration, the electric resistance value at 20 ° C. of the material constituting the heat generating member is R ₁ , the first conduction region, the second conduction region, and the conduction region extension. When the electric resistance value at 20 ° C. of the material constituting the existing part is R ₂ ,
R ₁ / R ₂ ≧ 1
Preferably,
60 ≧ R ₁ / R ₂ ≧ 1
It is desirable to satisfy More specifically, the electric resistance values of the first electrode, the second electrode, the first conductive means, the second conductive means, the first conductive region, the second conductive region, and the heating member are as follows: Satisfying the relationship is preferable from the viewpoint of achieving reliable heat generation of the heat generating member and preventing heat generation in the first electrode, the second electrode, the first conductive means, and the second conductive means. Here, the electrical resistance value can be obtained from {(volume resistance value of the material / cross-sectional area of the member) × length of the member}. As the electric resistance value R ₁ at 20 ° C of the material constituting the heat-generating member can be exemplified ^{2 × 10 -5 Ω~8 × 10 -2} Ω.
(First electrode, second electrode, first conductive means, second conductive means) <(first conduction region, second conduction region) ≦ heating member or
(First electrode, second electrode) ≦ (first conductive means, second conductive means) <(first conductive region, second conductive region) ≦ heating member

  In the mold assembly of the first configuration or the second configuration including the various preferable forms and configurations described above, the heat generating member has an insulating bolt whose tip is screwed into the heat generating member and penetrates the insert. In this case, the second end of the first conductive means and the second end of the second conductive means are the side surfaces of the nested body or It is preferable that the bottom surface is exposed, and it is desirable that each of the first conductive means and the second conductive means be made of a block-shaped metal material (for example, copper).

  Alternatively, in the mold assembly of the first configuration or the second configuration including the various preferable modes and configurations described above, each of the first conductive means and the second conductive means has a first end portion. 1 and the head corresponds to the second end, which extends through the interior of the nest and is made of a conductive bolt insulated from the nest body. The front end portion of the bolt is screwed with the heat generating member, and the head portion of the bolt can be in contact with the electrode.

  Furthermore, in the mold assembly of the first configuration or the second configuration including the various preferable forms and configurations described above, the side attached to the first mold portion in a state facing the side surface of the insert. A block is further provided, and the thermal conductivity is 1.3 (W / m · K) to 6.3 (W / m · M) on the side of the side block facing the side surface of the insert or inside the side block. K), and the formation of a ceramic material layer having a thickness of 0.5 mm to 5 mm suppresses rapid cooling of the molten thermoplastic resin injected into the cavity, or the temperature of the heating member This is preferable from the viewpoint of reducing uniformity and temperature increase / decrease loss, and from the viewpoint of improving insulation. There may be at least two side blocks.

Alternatively, in the mold assembly of the present invention including a form in which a cavity or a flow path is provided inside the heat generating member described above, the nesting assembly further includes:
(B-2) The first conductive means is provided on the surface facing the nesting, the first conductive means is in contact with the heat generating member, and the first conductive means faces the first side surface of the nesting. A first side block attached to the mold part of
(B-3) The second conductive means is provided on the surface facing the nest, the second conductive means is in contact with the heat generating member, and the second side facing the first side of the nest A second side block attached to the first mold part in a face-to-face state,
Have
The first electrode is in contact with the first conductive means;
The second electrode is in contact with the second conductive means;
The heating member may be configured to be electrically connected to the first electrode via the first conductive means and electrically connected to the second electrode via the second conductive means. it can. For convenience, the mold assembly of the present invention having such a configuration is referred to as a “third configuration mold assembly”.

Alternatively, in the mold assembly of the present invention including a form in which a cavity or a flow path is provided in the heat generating member described above, the nesting is further performed.
(B-3) a first conduction region, a second conduction region, and a conduction region extending portion connecting the first conduction region and the second conduction region formed on the insulating layer;
Consists of
The heat generating member is fixed on the insulating layer, the first conduction region, the conduction region extension portion, and the second conduction region, and constitutes a part of the cavity. The first conduction region, the conduction region extension portion, and the first conduction region Heated by Joule heat generated in two conduction regions and Joule heat generated in itself,
The nested assembly is further
(B-2) In the state where the first conductive means is provided on the surface facing the nesting, the first conductive means is in contact with the first conductive region and faces the first side surface of the nesting. A first side block attached to the first mold part, and
(B-3) The second conductive means is provided on the surface facing the nest, the second conductive means is in contact with the second conduction region, and the second opposite to the first side surface of the nest A second side block attached to the first mold part while facing the side surface of
Have
The first electrode is in contact with the first conductive means;
The second electrode is in contact with the second conductive means;
The heating member may be configured to be electrically connected to the first electrode via the first conductive means and electrically connected to the second electrode via the second conductive means. it can. The mold assembly of the present invention having such a configuration is referred to as a “fourth mold assembly” for convenience.

Alternatively, in the mold assembly of the present invention including a form in which a cavity or a flow path is provided in the heat generating member described above, the nesting is further performed.
(B-3) a first conduction region, a second conduction region, and a conduction region extending portion connecting the first conduction region and the second conduction region formed on the insulating layer;
Consists of
The heat generating member is fixed on the insulating layer, the first conduction region, the conduction region extension portion, and the second conduction region, and constitutes a part of the cavity. The first conduction region, the conduction region extension portion, and the first conduction region Heated by Joule heat generated in two conduction regions and Joule heat generated in itself,
The nested assembly is further
(B-2) The first conductive means and the second conductive means are provided on the surface facing the nest, and the first conductive means is in contact with the first conductive region and is separated from the first conductive means. A first side block attached to the first mold part in a state where the second conductive means provided in contact with the second conductive region and faces the first side surface of the nest; And
(B-3) a second side block attached to the first mold part in a state of facing the second side surface facing the first side surface of the nest;
Have
The first electrode is in contact with the first conductive means;
The second electrode is in contact with the second conductive means;
The heating member may be configured to be electrically connected to the first electrode via the first conductive means and electrically connected to the second electrode via the second conductive means. it can. The mold assembly of the present invention having such a configuration is referred to as a “fifth mold assembly” for convenience.

In the mold assembly of the fourth configuration or the fifth configuration, the electric resistance value at 20 ° C. of the material constituting the heat generating member is R ₁ , the first conduction region, the second conduction region, and the conduction region extension. When the electric resistance value at 20 ° C. of the material constituting the part is R ₂ ,
R ₁ / R ₂ ≧ 1
Preferably,
60 ≧ R ₁ / R ₂ ≧ 1
It is desirable to satisfy More specifically, each of the electricity of the first electrode, the second electrode, the first conductive means, the second conductive means, the first conduction region, the conduction region extension, the second conduction region, and the heating member. The resistance value satisfying the following relationship achieves reliable heat generation of the heat generating member, and prevents heat generation in the first electrode, the second electrode, the first conductive means, and the second conductive means. It is preferable from the viewpoint of doing. As the electric resistance value R ₁ at 20 ° C of the material constituting the heat-generating member can be exemplified ^{2 × 10 -5 Ω~8 × 10 -2} Ω.
(First electrode, second electrode, first conductive means, second conductive means) <(first conductive region, conductive region extension, second conductive region) ≦ heating member or
(First electrode, second electrode) ≦ (first conductive means, second conductive means) <(first conductive region, conductive region extending portion, second conductive region) ≦ heating member

  In the mold assemblies of the third configuration to the fifth configuration including the preferred embodiments described above, the thermal conductivity is 1.3 (W / W) inside each of the first side block and the second side block. m · K) to 6.3 (W / m · K) and a ceramic material layer having a thickness of 0.5 mm to 5 mm is formed, so that the molten thermoplastic resin injected into the cavity is rapidly cooled. It is preferable from the standpoint of suppressing heat dissipation, or from the standpoint of reducing temperature uniformity and temperature rise / fall loss of the heat generating member, and from the standpoint of improving insulation.

  Furthermore, in the mold assemblies having the third to fifth configurations including the preferred embodiments described above, the heat generating member has an insulating property in which the tip portion is screwed into the heat generating member and penetrates the insert. The heat generating member can be configured to be fixed to the nest by the bolts of the first side block, or the top portion of the second side block. It can be set as the form fixed to the nest by the 2nd projection part provided in.

  Furthermore, in the mold assembly of the present invention including the various preferred modes and configurations described above, the volume resistivity at 20 ° C. of the material constituting the heat generating member is 0.017 μΩ · m to 1.5 μΩ · m, preferably 0.026 μΩ · m to 0.8 μΩ · m, and more preferably 0.1 μΩ · m to 0.8 μΩ · m. More specifically, the material having a volume resistivity of 0.017 μΩ · m is copper (Cu), and the material having a volume resistivity of 0.026 μΩ · m is aluminum (Al). The thickness of the heat generating member is desirably 0.1 mm to 20 mm, preferably 0.3 mm to 5 mm.

  In addition, the mold assembly of the present invention including the various preferable forms and configurations described above is disposed in the first mold part and / or the second mold part, and molten resin injection communicated with the cavity. It is desirable to further include a section. Here, the molten resin injection part (gate part) can have any known gate structure, for example, a direct gate structure, a side gate structure, a jump gate structure, a pinpoint gate structure, a tunnel gate structure, a ring. Examples thereof include a gate structure, a fan gate structure, a disk gate structure, a flash gate structure, a tab gate structure, and a film gate structure.

  In the mold assembly of the present invention including the various preferred modes and configurations described above (hereinafter, these may be collectively referred to simply as the mold assembly of the present invention), the mold is made of carbon. What is necessary is just to produce with a known method from metal materials, such as steel, stainless steel, an aluminum alloy, and a copper alloy.

  In the mold assembly of the present invention, examples of the material constituting the nesting body include metal materials such as carbon steel, stainless steel, aluminum alloy, and copper alloy, which are produced based on cutting / polishing and wire electric discharge machining methods. be able to. In addition, it can also be set as the structure which provides the through-hole of a suitable diameter inside a nesting body, and arrange | positions the piping for flowing a cooling water in the through-hole which concerns.

In the mold assembly of the present invention, the material constituting the insulating layer has a thermal conductivity of 1.3 (W / m · K) to 6.3 (W / m · K) and a thickness of 0.00. A ceramic material of 5 mm to 5 mm can be exemplified. Here, as the ceramic material, a wide range of ceramics selected from the group consisting of zirconia-based materials, partially stabilized zirconia, alumina-based materials, and K ₂ O—TiO ₂ can be mentioned, and more specifically, ZrO. ₂ , ZrO ₂ —CaO, ZrO ₂ —Y ₂ O ₃ , ZrO ₂ —MgO, ZrO ₂ —SiO ₂ , ZrO ₂ —CeO ₂ , K ₂ O—TiO ₂ , Al ₂ O ₃ , Al ₂ O ₃ —TiC And ceramics selected from the group consisting of Ti ₃ N ₂ , 3Al ₂ O ₃ -2SiO ₂ , MgO-SiO ₂ , 2MgO-SiO ₂ , MgO-Al ₂ O ₃ -SiO ₂ and titania. The method for forming the insulating layer may be appropriately selected depending on the material to be used, for example, a spraying method (a method of spraying a powder composed of the above-described composition using a spray gun at a high temperature on the nested body, Arc spraying, plasma spraying, etc.).

  In the mold assembly of the present invention, any material can be used as the material constituting the heat generating member as long as it is a conductive material such as stainless steel, steel, titanium, nickel, etc. Among them, titanium is used. Is preferred. A method for manufacturing the heat generating member may be appropriately selected depending on the material to be used, and examples thereof include processing into a plate shape, a plating method, and an electrodeposition method. The heat generating member is fixed on the insulating layer or the like, but the concept of “fixing” includes a stamper form in which the heat generating member is detachably mounted on the insulating layer or the like. A form in which the insulating layer or the like is formed integrally with the insulating layer or the like (for example, formed based on a plating method or an electrodeposition method) is also included. The surface of the heat generating member may be smooth or may be provided with a pattern depending on the molded product to be molded. Furthermore, if necessary, a design layer for applying a design to the surface of the molded product to be molded may be provided on the surface of the heat generating member, or the design layer may be placed and fixed. In addition, when a plating layer is formed on the surface of the heat generating member, or when a stamper is placed on the surface of the heat generating member, the state of heat generation depends on the heat generating member. Even the value is not a problem. When forming a plating layer on the surface of the heat generating member, the thickness of the plating layer can be exemplified by 0.03 mm to 0.5 mm.

In the mold assembly of the present invention, copper (Cu) can be exemplified as a material constituting the first conductive means, the second conductive means, the first electrode, and the second electrode. However, from the viewpoint of preventing the loss of the current flowing through the heat generating member and the conductive region due to the electrode or conductive means coming into contact with the metal mold or the nested body, the second end portion or the conductive portion is prevented. As a countermeasure against insulation on the surface of the first electrode and the second electrode excluding the portion in contact with the means, a ceramic layer having a thickness of 0.5 mm or less, a resin layer such as polyimide, tetrafluoroethylene, or epoxy , and paint (preferably It is desirable to form a non-conductive plating layer made of insulating paint), alumite treatment, tin alloy or the like. The side block may be manufactured from the metal material exemplified as the material constituting the nested body, and the ceramic material layer may be formed from various materials exemplified as the material constituting the insulating layer.

  In the mold assembly of the second configuration or the fourth configuration to the fifth configuration, copper (Cu), copper as a material constituting the first conductive region, the conductive region extending portion, and the second conductive region Alloy (eg, copper-zinc alloy, copper-cadmium alloy, copper-tin alloy), chromium (Cr), chromium alloy (eg, nickel-chromium alloy), nickel (Ni), nickel alloy (nickel-iron alloy, nickel) -Cobalt alloy, nickel-tin alloy, nickel-phosphorus alloy [Ni-P series], nickel-iron-phosphorus alloy [Ni-Fe-P series], nickel-cobalt-phosphorus alloy [Ni-Co-P series]) And carbon. Examples of the method for forming the first conductive region, the conductive region extending portion, and the second conductive region include an electrolytic plating method, an electroless plating method, and a paste printing method.

In the mold assembly of the first configuration or the third configuration, a current is passed from the first electrode to the first conductive means, the heat generating member, the second conductive means, and the second electrode, In the mold assembly of the structure or the fourth structure to the fifth structure, from the first electrode, the first conductive means, the first conductive region, the conductive region extending portion, the second conductive region, A current is passed to the second conductive means and the second electrode. In this case, either direct current or alternating current may be used. However, considering electric shock or the like, direct current is safer than alternating current, and The higher the frequency, the safer. From this, it is preferable to use high-frequency alternating current rather than low-frequency alternating current, more preferably to use direct current rather than high-frequency alternating current, and even more preferably to use high-frequency direct-current pulses rather than direct current. Further, the current to be flowed may be 1 × 10 ² ampere to 6 × 10 ³ ampere, depending on the volume resistivity and the size of the heat generating member. It is preferable that the maximum current value of the power supply itself is large because the control range when using a large heat generating member with a large area is increased. More specifically, the maximum current value of the power supply itself is illustrated as 1 × 10 ⁴ amperes can do. In addition, an appropriate value may be selected as the voltage to be applied based on the current value to be applied, the electric resistance value of the heat generating member, and the like. Start of current supply to the heat generating member in the mold assembly of the first configuration or the third configuration, the first conductive means in the mold assembly of the second configuration or the fourth configuration to the fifth configuration The current supply may be started before the molten thermoplastic resin is injected into the cavity (for example, 1 second to 20 seconds before). On the other hand, the current supply to the heating member or the first conductive means is stopped at the same time as or after completion of the injection of the molten thermoplastic resin into the cavity (for example, after 0 to 30 seconds have elapsed from the completion of the injection). That's fine. If the set temperature is reached before or after the injection of the molten thermoplastic resin into the cavity, the current is supplied to the heat generating member or the first conductive means at that point in some cases. May be stopped.

Further, the heat generating member generates heat by flowing current through the heat generating member, or the first conductive region, conductive by flowing current through the first conductive region, the conductive region extending portion, and the second conductive region. when it is heating the heat-generating member with the heat, the surface temperature of the heat generating member at this time (the temperature of the surface facing the cavity) was T ₁ by heating a region extension and the second conductive region, 150 ° C ≦ T ₁ ≦ 280 ° C. can be exemplified. Alternatively, usually, a thermoplastic resin that is metered, plasticized, and melted in an injection cylinder provided in an injection molding apparatus is injected from the injection cylinder, and a sprue and a molten resin injection part (gate part) provided in the mold. ) Is introduced (injected) into the cavity and held in pressure, but when the temperature of the molten thermoplastic resin in the injection cylinder is T ₀ , (T ₀ -230) ° C ≦ T ₁ ≦ T ₀ ° C can be exemplified.

  Examples of the thermoplastic resin suitable for molding a molded article using the mold assembly of the present invention include a crystalline thermoplastic resin and an amorphous thermoplastic resin, and specifically, a polyethylene resin and a polypropylene resin. Polyolefin resins such as polyamide 6, polyamide 66, polyamide MXD6, etc .; Polyoxymethylene resins; Polyester resins such as polyethylene terephthalate (PET) resins and polybutylene terephthalate (PBT) resins; Polyphenylene sulfide resins; Polystyrene Styrenic resin such as resin, ABS resin, AES resin, AS resin; methacrylic resin; polycarbonate resin; modified PPE resin; polysulfone resin; polyethersulfone resin; polyarylate resin; ; Polyimide resins; polyether ketone resins; polyether ether ketone resins; polyester carbonate resin; liquid crystal polymer, COP, the COC may be exemplified.

  Furthermore, a thermoplastic resin made of a polymer alloy material can be used. Here, the polymer alloy material is composed of a blend of at least two types of thermoplastic resins, or a block copolymer or graft copolymer in which at least two types of thermoplastic resins are chemically bonded. A polymer alloy material is widely used as a high-functional material that can have the unique performance of each of the individual thermoplastic resins. As a thermoplastic resin constituting a polymer alloy material in which at least two kinds of thermoplastic resins are blended, styrene resins such as polystyrene resin, ABS resin, AES resin, and AS resin; polyolefin resins such as polyethylene resin and polypropylene resin; methacrylic resin Polycarbonate resin; polyamide resin such as polyamide 6, polyamide 66, polyamide MXD6; modified PPE resin; polyester resin such as polybutylene terephthalate resin and polyethylene terephthalate resin; polyoxymethylene resin; polysulfone resin; polyimide resin; Polyarylate resin; Polyether sulfone resin; Polyether ketone resin; Polyether ether ketone resin; Polyester carbonate resin; It can be mentioned elastomers; chromatography. As a polymer alloy material obtained by blending two types of thermoplastic resins, a polymer alloy material of a polycarbonate resin and an ABS resin can be exemplified. Such a combination of resins is expressed as polycarbonate resin / ABS resin. The same applies to the following. Furthermore, as a polymer alloy material blended with at least two types of thermoplastic resins, polycarbonate resin / PET resin, polycarbonate resin / PBT resin, polycarbonate resin / polyamide resin, polycarbonate resin / PBT resin / PET resin, modified PPE resin / HIPS Resin, modified PPE resin / polyamide resin, modified PPE resin / PBT resin / PET resin, modified PPE resin / polyamide MXD6 resin, polyoxymethylene resin / polyurethane resin, PBT resin / PET resin, polycarbonate resin / liquid crystal polymer be able to. Moreover, HIPS resin, ABS resin, AES resin, and AAS resin can be illustrated as a polymer alloy material consisting of a block copolymer or graft copolymer in which at least two kinds of thermoplastic resins are chemically bonded.

  Stabilizers, UV absorbers, release agents, dyes and pigments can be added to the various thermoplastic resins described above, and inorganic fibers and inorganic fillers such as glass beads, mica, kaolin, and calcium carbonate Alternatively, an organic filler can be added. Here, examples of the inorganic fiber include glass fiber, carbon fiber, wollastonite, aluminum borate whisker fiber, potassium titanate whisker fiber, basic magnesium sulfate whisker fiber, calcium silicate whisker fiber and calcium sulfate whisker fiber. Examples of the inorganic fiber content include 5% by weight to 80% by weight.

  As a molded product molded using the mold assembly of the present invention, a light guide plate, a reflective frame, a reflective plate, a diffuser plate, an optical film used in a liquid crystal display device; a battery pack used in a mobile phone, a housing, Buttons; housings for personal computers and television receivers; exterior plates, window glass, headlamps, taillights, various reflectors, door handles, intake manifolds, instrument panels, etc. used in automobiles And connectors; camera housings, lens barrels, microlens arrays, multifocal lenses, Fresnel lenses; optical lenses for spectacles, etc .; various sheets; illumination covers; reflective mirrors; OA equipment housings; Covers can be exemplified.

  In the mold assembly of the present invention, an insulating layer having a prescribed thermal conductivity and thickness is formed on the top surface of the insert body, and the heat generating member, the first conduction region, the conduction region extension portion, and the second Therefore, it is possible to improve the temperature rise characteristics and temperature uniformity during energization. Therefore, the molten thermoplastic resin injected into the cavity is not cooled suddenly or non-uniformly, and appearance defects such as weld marks, flow marks, and glass fiber floating occur in the molded product. As a result, the fluidity of the molten thermoplastic resin in the cavity can be remarkably improved, so that fine irregularities can be reliably transferred to the surface of the molded product, and distortion is not easily generated inside the molded product. . Further, if the first conductive means and the second conductive means are defined, a large current is reliably supplied to the heat generating member, the first conductive region, the conductive region extending portion, and the second conductive region, It can flow safely.

  Further, in the mold assembly of the present invention, by providing a cavity for controlling the current flow in the heat generating member inside the heat generating member, that is, by partially reducing the thickness of the heat generating member, the electric resistance As a result of the higher value, the current density becomes higher and the temperature rises more easily, and the heat generation state of the heat generating member can be easily and accurately controlled. Usually, the temperature of the heat generating member is controlled by measuring the temperature of the heat generating member with a temperature measuring means such as a thermocouple installed therein, and after the heat generating member reaches the set temperature, the molten thermoplastic resin is put into the cavity. The cooling process is started simultaneously with the completion of the injection or after a predetermined time has elapsed, but the cooling time of the thermoplastic resin injected into the cavity is shortened by flowing a cooling medium inside the heating member. That is, the molding cycle can be shortened, and productivity can be improved.

  Hereinafter, the present invention will be described based on examples with reference to the drawings.

  Example 1 relates to a mold assembly of the present invention, and more specifically, to a mold assembly having a first configuration. FIG. 1A shows a schematic perspective view of the insert assembly in the mold assembly of Example 1, and FIG. 1 shows a schematic cross-sectional view taken along the arrow AA in FIG. (B). 1A is a schematic perspective view when the nesting body is cut along the arrow AA in FIG. 1A, and FIG. 2 is a schematic perspective view of the side block. FIG. 2C shows a schematic perspective view of the first electrode and the second electrode shown in FIG. Furthermore, a schematic perspective view of the nesting body before assembly is shown in FIG. 3, and conceptual diagrams of the entire mold assembly and the injection molding apparatus are shown in FIGS. In FIG. 1A, some components are hatched in order to clearly indicate the components. 5, FIG. 6, (A), FIG. 8, FIG. 9 (A), and FIG. 10, which will be described later, are schematic cross-sectional views that are substantially the same as those taken along the arrow AA in FIG. FIG. 6B is a schematic perspective view when the nesting body and the like are cut along the arrow AA in FIG.

  As shown in FIG. 4B, the injection molding apparatus suitable for use in Example 1 or Example 2 to Example 8 described later includes a screw 11 for supplying molten thermoplastic resin. The injection cylinder 10, the fixed platen 16 </ b> A, the movable platen 16 </ b> B, the tie bar 17, the mold clamping hydraulic cylinder 18, and the hydraulic piston 19 are provided. The movable platen 16B can move in parallel on the tie bar 17 by the operation of the hydraulic piston 19 in the mold clamping hydraulic cylinder 18.

  As shown in FIGS. 4A and 4B, the mold is composed of a second mold part (fixed mold part) 12 and a first mold part (movable mold part) 13. ing. The fixed mold part 12 is attached to the fixed platen 16A, and the movable mold part 13 is attached to the movable platen 16B. The movable mold part 13 is engaged with the fixed mold part 12 by the movement of the movable platen 16B in the direction of the arrow “A” in FIG. 4B, and the cavity 15 is formed. Furthermore, the movable mold part 13 is disengaged from the fixed mold part 12 by moving the movable platen 16B in the direction of the arrow “B” in FIG. The mold part 12 is opened. The second mold part (fixed mold part) 12 is provided with a molten resin injection part (gate part) 14.

In the first embodiment, a nesting assembly 20 having a nesting 30 is disposed in a first mold part (movable mold part) 13. The mold assembly includes a first electrode 60A and a second electrode 60B. In Example 1, the nesting 30 includes a nesting body 31 made of carbon steel S55C having a thickness of 35 mm by cutting and polishing, and an insulating layer 33. Here, the insulating layer 33 is a ceramic material having a thermal conductivity of 1.3 (W / m · K) to 6.3 (W / m · K) and a thickness of 0.5 mm to 5 mm, for example. More specifically, it is made of zirconia ceramics (ZrO ₂ —Y ₂ O ₃ )] having a thickness of 1.0 mm and a thermal conductivity of 3 (W / m · K). It is formed on the surface based on the plasma spraying method and is integrated with the top surface of the nesting body 31. A lower insulating layer 32 made of the same material as the insulating layer 33 is also formed on the lower surface of the nested body 31. The nesting body 31 is provided with a gap (see FIG. 3) for attaching the first conductive means 50A and the second conductive means 50B.

The insert assembly 20 further includes a heat generating member 41, a first conductive means 50A, and a second conductive means 50B. The heat generating member 41 is SUS420J2 (Hitachi Metals Co., Ltd.) having a thickness of 5.0 mm, a volume resistivity at 20 ° C. of 0.56 (μΩ · m), and an electric resistance R ₁ of 1.96 × 10 ⁻⁴ Ω. It is made of HPM 38), is fixed on the insulating layer 33, forms part of the cavity 15, and generates Joule heat when a current flows. The first conductive means 50A for causing a current to flow through the heat generating member 41 has a first end 51A and a second end 52A, and the inside of the insert 30 (more specifically, the inside of the insert body 31). The heat generating member 41 and the first end 51A are in contact with each other through the insulating layer 33. The second conductive means 50B for causing a current to flow through the heat generating member 41 has a first end 51B and a second end 52B, and the inside of the insert 30 (more specifically, the inside of the insert body 31). The heat generating member 41 and the first end 51B are in contact with each other through the insulating layer 33. Each of the first conductive means 50A and the second conductive means 50B is made of a block-shaped metal material (specifically, copper) and has a substantially “L” -shaped cross section. The second end 52A of the first conductive means 50A and the second end 52B of the second conductive means 50B are exposed on the side surface of the nesting body 31. The heat generating member 41 has an end portion screwed into the heat generating member 41 and an insulating bolt 35 penetrating through the insert 30 [more specifically, zirconia ceramics passed through the through hole 34 penetrating the insert 30 ( It is fixed to the insert 30 by bolts 35] made of ZrO ₂ —Y ₂ O ₃ ).

  The nesting assembly 20 further includes two side blocks 70 </ b> A and 70 </ b> B attached to the first mold part (movable mold part) 13 while facing the side surface of the nesting 30. The side blocks 70A and 70B are made of carbon steel. The side blocks 70A and 70B facing the side surfaces of the insert 30 have a thermal conductivity of 1.3 (W / m · K) to 6.3 (W / m · K) and a thickness of Ceramic material layers 71A and 71B of 0.5 mm to 5 mm (specifically, a thickness of 0.8 mm) are formed based on a thermal spraying method. The ceramic material layers 71 </ b> A and 71 </ b> B are made of the same material as the insulating layer 33. Protrusions 74A and 74B are provided on the top portions 73A and 73B of the side blocks 70A and 70B, and side surfaces 75A and 75B of the protrusions 74A and 74B face the cavity 15 and constitute a part of the cavity 15. . When the first mold part (movable mold part) 13 and the second mold part (fixed mold part) 12 are clamped, the top portions 73A and 73B of the side blocks 70A and 70B are the second mold. The part (fixed mold part) 12 comes into contact. The side blocks 70A and 70B are provided with notches 72A and 72B for passing the first electrode 60A and the second electrode 60B.

  The first electrode 60A made of copper is in contact with the exposed second end 52A of the first conductive means 50A, and the second electrode 60B made of copper is the exposed second end of the second conductive means 50B. Is in contact with the end portion 52B. Part of the surface of the first electrode 60A and the second electrode 60B is covered with insulating films 61A and 61B. Further, the portion of the first electrode 60A not in contact with the exposed second end 52A of the first conductive means 50A and the exposed second end 52B of the second conductive means 50B. The portion of the second electrode 60B that is not covered is covered with an insulating paint (not shown). Also, the first electrode 60A and the second electrode 60B are provided with mounting holes 62A and 62B with threads for mounting the bolts 63A and 63B, and the wirings 64A and 64B connect the bolts 63A and 63B. And securely fixed to the first electrode 60A and the second electrode 60B.

  The contact portion between the first electrode and the first conductive means, and the contact portion between the second electrode and the second conductive means may be flat, complementary shapes, or mutually engaged. The shape to be formed may be, for example, an uneven shape. The same applies to Examples 2 to 8 described later.

  In assembling the nested assembly 20, the first conductive means 50 </ b> A and the second conductive means 50 </ b> B are inserted into the gap provided in the nested body 31 from the side surface of the nested body 31. Next, the holding plate 36 is fixed to the side surface of the nesting body 31. The holding plate 36 is fixed to the side surface of the nesting body 31 through a through hole 37 provided in the holding plate 36, a mounting hole 38 provided in the side surface of the nesting body 31, and a bolt (not shown). It can be performed by a method of fixing using and. An insulating layer 33 ′ and a lower insulating layer 32 ′ are formed on the top surface and the lower surface of the holding plate 36 in the same manner as the insulating layer 33 and the lower insulating layer 32. Next, the heat generating member 41 is fixed on the insulating layer 33 using the bolt 35. On the other hand, the first electrode 60A and the second electrode 60B are fixed to the notches 72A and 72B of the side blocks 70A and 70B by an appropriate means and method, and the nesting body 31 is sandwiched between the side blocks 70A and 70B. (See FIG. 1B). Then, the side blocks 70A and 70B are attached to the first mold part (movable mold part) 13 using bolts (not shown).

A DC inverter power supply (16 KHz, DC pulse) having a maximum applied current of 6000 amperes and a maximum voltage of 8 volts was used as the power supply device. The size of the heat generating member 41 was 80 mm in width, 140 mm in length, and thickness (t ₁ ) of 5.0 mm. The direction of energization is generally along the width direction. FIG. 14 shows a temperature measurement result of the heat generating member 41 when a thermocouple as a temperature measuring unit is attached to the surface of the heat generating member 41 of the nested assembly 20 and a current is passed through the heat generating member 41. Since the mold temperature was set to 50 ° C., the temperature of the heat generating member 41 immediately before the current was supplied was 50 ° C. When a current of 5 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 1.2 volts was generated at both ends of the heat generating member 41. After 13 seconds from the start of current flow, the temperature of the heat generating member 41 became 220 ° C. That is, the average heating rate was 13 ° C./second. On the other hand, the temperature of the heating member 41 reached 100 ° C. after 47 seconds had elapsed since the supply of current was stopped. That is, the average cooling rate was 2.6 ° C./second.

  As Comparative Example 1, a heat generating member in which an insulating layer was not formed was produced. Table 1 shows constituent materials and thicknesses of the heat generating member. The width and length of the heat generating member in Comparative Example 1 are the same as those of the heat generating member of Example 1. Table 1 shows the temperature measurement results of the heating member when the heating member of Comparative Example 1 was used and a current was passed through the heating member under the same conditions as in Example 1. From Table 1, it can be seen that the heating member of Comparative Example 1 has a very low heating rate compared to the heating member of Example 1. In Comparative Example 1, the current continued to flow for 120 seconds in the end, but the temperature of the heating member only increased to 95 ° C.

Injection molding was performed using the mold assembly of Example 1. As the thermoplastic resin, a polycarbonate resin (manufactured by Mitsubishi Engineering-Plastics Corporation HL7001, glass transition temperature T _g: 143 ° C) was used. The molding conditions were as shown in Table 2 below. Energization of the heat generating member 41 (current 5 × 10 ³ ampere, generated voltage 1.2 volts) is started 15 seconds before the start of injection of the molten thermoplastic resin into the cavity 15, and the molten thermoplastic resin cavity 15 The injection was stopped 0.5 seconds after the completion of the injection into the inside. The heating member set temperature refers to the surface temperature of the heating member in a state where it is not in contact with the molten thermoplastic resin.

[Table 2]
Resin temperature: 280 ° C
Mold temperature: 50 ° C
Heating member set temperature: 240 ° C
Injection speed: 300 mm / second

  In the obtained molded product (specifically, the light guide plate), even though the molding condition is low resin temperature and slow injection speed even though the thickness is as thin as 0.3 mm, the cavity The interior of 15 could be easily and completely filled with molten thermoplastic resin. The transfer rate of the prism shape formed on the surface of the molded product was almost 100%. Moreover, when the distortion of the molded product was observed through the polarizing plate, the whole was black, and it was found that the distortion was small.

For comparison, injection molding was performed under the same molding conditions as in Example 1, using the nested assembly of Comparative Example 1 described above. That is, energization of the heat generating member (current 5 × 10 ³ ampere, generated voltage 1.2 volts) was started 15 seconds before the start of injection of the molten thermoplastic resin into the cavity 15, and the molten thermoplastic resin cavity Stopped 0.5 seconds after the completion of injection into 15. Note that the surface temperature of the heat generating member increased only to 93 ° C. when energized for 15 seconds. As a result, under the same molding conditions as in Example 1, the inside of the cavity 15 could not be filled with the molten thermoplastic resin. Therefore, when the molding conditions were changed to a resin temperature of 360 ° C. and an injection speed of 1500 mm / second, the inside of the cavity 15 could be filled with the molten thermoplastic resin. However, the obtained molded product has a large warp, and when the distortion of the molded product is observed through the polarizing plate, a rainbow color is recognized in the entire molded product, and a very large birefringence is generated, and there is a large distortion. I found out that

  In the first embodiment described above, the second end 52A of the first conductive means 50A is exposed to the side block 70A side, and the second end 52B of the second conductive means 50B is exposed to the side block 70B. However, alternatively, the second end 52A of the first conductive means 50A and the second end 52B of the second conductive means 50B are spaced apart to the side block 70A side. In the state, the second end portion 52A of the first conductive means 50A and the second end portion 52B of the second conductive means 50B are separated from the side block 70B side. , May be exposed. Further, the second end 52A of the first conductive means 50A and the second end 52B of the second conductive means 50B may be exposed on the bottom surface of the nested body 31.

  The second embodiment is a modification of the first embodiment. In the second embodiment, as shown in a schematic cross-sectional view in FIG. 5, each of the first conductive means 80A and the second conductive means 80B has a tip corresponding to the first ends 81A and 81B. The head corresponds to the second end portions 82A and 82B, extends inside the insert 30 (specifically, in the second embodiment, penetrates the insert 30), and is insulated from the insert body 31. Made of conductive bolts (specifically, carbon steel). Here, the tip of the bolt is screwed into the heat generating member 41, and the head of the bolt is in contact with an electrode (not shown). That is, the second end portion 82A of the first conductive means 80A and the second end portion 82B of the second conductive means 80B are exposed on the bottom surface of the nesting body 31. Except for the above points, the other components of the nesting assembly can be the same as the nesting assembly described in the first embodiment, and a detailed description thereof will be omitted.

  Example 3 also relates to the mold assembly of the present invention, and more specifically, to the mold assembly of the second configuration. FIG. 6A shows a schematic cross-sectional view of the nesting assembly in the mold assembly of Example 3, and FIG. 6B shows a schematic perspective view when the nesting body and the like are cut. . Moreover, the pattern of the 1st conduction | electrical_connection area | region, the conduction | electrical_connection area extension part, and the 2nd conduction | electrical_connection area | region in the metal mold | die assembly of Example 3 is typically shown to FIG.

The basic configuration and structure of the mold assembly in the third embodiment are the same as the configuration and structure of the mold assembly described in the first embodiment. In the third embodiment, the nest 130 includes a nest body 31 similar to that of the first embodiment and an insulating layer 33 similar to that of the first embodiment. Further, the nest 130 has a first conductive region 139A, a second conductive region 139B formed on the insulating layer 33, and a conductive region extending between the first conductive region 139A and the second conductive region 139B. It is comprised from the existing part 139C, and this point is different from the nesting 30 in the first embodiment. Here, the first conductive region 139A, the second conductive region 139B, and the conductive region extending portion 139C are made of copper (Cu), and are formed on the insulating layer 33 based on an electroplating method. The volume resistivity at 20 ° C. of the first conduction region 139A, the second conduction region 139B, and the conduction region extension 139C is 0.017 μΩ · m. The electrical resistance value R ₂ at 20 ° C. of each of the first conduction region 139A, the second conduction region 139B, and the conduction region extension portion 139C is 0.17 × 10 ⁻⁵ Ω, 0.18 × 10 ^-5 Ω, 1.9 × 10 ^-5 Ω. In (A) of FIG. 7 or (B) to (C) of FIG. 7 to be described later, the first conductive region 139A, the second conductive region 139B, and the conductive region extending portion 139C are hatched. In addition, the first conductive region 139A and the second conductive region 139B are represented by regions surrounded by dotted lines.

  Further, the nested assembly 120 in the third embodiment further includes a heat generating member 141 having the same configuration and structure as the heat generating member 41 of the first embodiment, the first conductive means 50A, and the second conductive means 50B. is doing. Here, in Example 3, the heat generating member 141 is fixed on the insulating layer 33, the first conductive region 139A, the conductive region extending portion 139C, and the second conductive region 139B. It is partly configured and is heated by Joule heat generated in the first conductive region 139A, the conductive region extending portion 139C and the second conductive region 139B, and Joule heat generated in the heat generating member 141 itself. The The first conductive means 50A has a first end portion 50A and a second end portion 52A, and is disposed inside the insert 130 (more specifically, inside the insert body 31). The first conduction region 139A and the first end portion 50A are in contact with each other, so that a current can flow through the first conduction region 139A. On the other hand, the second conductive means 50B has a first end 50B and a second end 52B, and is disposed inside the insert 130 (more specifically, inside the insert main body 31). And the 2nd conduction | electrical_connection area | region 139B and the 1st edge part 50B are contacting, and an electric current can be sent through the 2nd conduction | electrical_connection area | region 139B. Further, as in the first embodiment, the first electrode 60A is in contact with the exposed second end 52A of the first conductive means 50A, and the second electrode 60B is the second conductive means. It is in contact with the exposed second end 52B of 50B. Similarly to the first embodiment, the heat generating member 141 is fixed to the nest 30 by an insulating bolt 35 whose front end is screwed into the heat generating member 141 and penetrates the nest 30.

  Also in the third embodiment, the nesting assembly 120 has two side blocks 70A attached to the first mold portion (movable mold portion) 13 in a state of facing the side surface of the nesting 130, as in the first embodiment. , 70B. Since the configuration and structure of the side blocks 70A and 70B can be the same as the configuration and structure of the side blocks 70A and 70B described in the first embodiment, detailed description thereof is omitted.

  Further, the configurations and structures of the first electrode 60A and the second electrode 60B can be the same as the configurations and structures of the first electrode 60A and the second electrode 60B described in the first embodiment. The detailed description is omitted, and the assembly of the nested assembly 120 can be the same as the assembly of the nested assembly 20 described in the first embodiment.

  When a thermocouple, which is a temperature measuring means, is attached to the surface of the heat generating member 141 of such a nested assembly 120, and a current is passed through the first conduction region 139A, the conduction region extension 139C, and the second conduction region 139B The temperature measurement result of the heat generating member 141 was substantially the same as that of Example 1.

  Moreover, when injection molding was performed under the same molding conditions as in Example 1 using the mold assembly of Example 3, the same results as in Example 1 were obtained.

  FIGS. 7B and 7C schematically show another example of the pattern of the first conductive region 139A, the conductive region extending portion 139C, and the second conductive region 139B in the mold assembly of the third embodiment. As shown in FIG. 7, the patterns are “ladder shape” (see FIG. 7A), “zigzag shape” (see FIG. 7B), and “spiral shape” (see FIG. 7C). The pattern is not limited to the above and can be essentially any pattern.

  In the third embodiment described above, the second end 52A of the first conductive means 50A is exposed to the side block 70A side, and the second end 52B of the second conductive means 50B is exposed to the side block 70B. However, alternatively, the second end 52A of the first conductive means 50A and the second end 52B of the second conductive means 50B are spaced apart to the side block 70A side. In the state, the second end portion 52A of the first conductive means 50A and the second end portion 52B of the second conductive means 50B are separated from the side block 70B side. , May be exposed. Further, the second end 52A of the first conductive means 50A and the second end 52B of the second conductive means 50B may be exposed on the bottom surface of the nested body 31.

  The fourth embodiment is a modification of the third embodiment. In the fourth embodiment, as shown in a schematic cross-sectional view in FIG. 8, each of the first conductive means 80A and the second conductive means 80B has a tip portion at the first end as in the second embodiment. It corresponds to the portions 81A and 81B, the head corresponds to the second end portions 82A and 82B, extends inside the insert 130, and is made of a conductive bolt insulated from the insert body 31. Here, the tip of the bolt (corresponding to the first end 81A) constituting the first conductive means 80A is in contact with the first conduction region 139A, and the head of the bolt (second end) (Corresponding to the part 82A) is in contact with a first electrode (not shown). On the other hand, the tip of the bolt (corresponding to the first end 81B) constituting the second conductive means 80B is in contact with the second conduction region 139B, and the head of the bolt (second end) (Corresponding to 82B) is in contact with a second electrode (not shown). The second end portion 82A of the first conductive means 80A and the second end portion 82B of the second conductive means 80B are exposed at the bottom surface of the nesting body 31. Except for the above points, the other components of the nesting assembly can be the same as the nesting assembly described in the third embodiment, and a detailed description thereof will be omitted.

  Example 5 also relates to a mold assembly of the present invention, and more specifically, to a mold assembly having a third configuration. FIG. 9A shows a schematic cross-sectional view of the insert assembly in the mold assembly of Example 5, and FIG. 9B shows a schematic perspective view of the side block.

  The basic configuration and structure of the mold assembly in the fifth embodiment are the same as the configuration and structure of the mold assembly described in the first embodiment. In the fifth embodiment, the nest 230 can be constituted by the same nest body 31 as in the first embodiment and the insulating layer 33 as in the first embodiment. Further, the nested assembly 220 is further provided with a heat generating member 41 similar to that of the first embodiment, which is fixed on the insulating layer 33 and forms part of the cavity 15 to generate Joule heat, as in the first embodiment. I have.

In the fifth embodiment, the nesting assembly 220 includes a first side block 270A and a second side block 270B. Here, in the first side block 270A, the first conductive means 250A is provided on the surface facing the insert 230. Then, in a state where the first conductive means 250A is in contact with the heat generating member 41 and faces the first side surface 30A of the insert 230 , the first side block 270A is a first mold portion (movable mold). Part) 13 with bolts (not shown). In the second side block 270B, the second conductive means 250B is provided on the surface facing the insert 230. The second side block 270B is in the state where the second conductive means 250B is in contact with the heat generating member 41 and faces the second side surface 30B facing the first side surface 30A of the insert 230. Is attached to a mold part (movable mold part) 13 by a bolt (not shown).

  The first electrode 60A is in contact with the end face 252A of the first conductive means 250A, and the second electrode 60B is in contact with the end face 252B of the second conductive means 250B. Each of the first conductive means 250A and the second conductive means 250B is made of a block-shaped metal material (specifically, copper), and has a substantially “L” cross-sectional shape. Since the configuration and structure of the first electrode 60A and the second electrode 60B can be the same as the configuration and structure of the first electrode 60A and the second electrode 60B described in the first embodiment, a detailed description will be given. Is omitted.

  Note that the portion of the first conductive means 250A that is in contact with the heat generating member 41 and the portion other than the portion that is in contact with the first electrode 60A (end surface 252A) are covered with an insulating film (not shown). Further, the portion other than the portion of the second conductive means 250B that contacts the heat generating member 41 and the portion that contacts the second electrode 60B (end surface 252B) is also covered with an insulating film (not shown).

  Further, in each of the first side block 270A and the second side block 270B, the thermal conductivity is 1.3 (W / m · K) to 6.3 (W / m · K), Ceramic material layers 271A and 271B having a thickness of 0.5 mm to 5 mm (specifically, 1.5 mm) are formed based on cutting of the sintered body. The constituent material of the ceramic material layers 271A and 271B may be the same as the constituent material of the insulating layer 33 in the first embodiment, for example, and the constituent material of the side blocks 270A and 270B is the same as that of the side blocks 70A and 70B in the first embodiment. It may be the same as the constituent material.

  Further, the heat generating member 41 is nested by a first protrusion 274A provided on the top of the first side block 270A and a second protrusion 274B provided on the top of the second side block 270B. 230 is fixed. The side surfaces 275A and 275B of the protrusions 274A and 274B face the cavity 15 and constitute a part of the cavity 15. When the first mold part (movable mold part) 13 and the second mold part (fixed mold part) 12 are clamped, the top portions 273A and 273B of the side blocks 270A and 270B are the second mold. The part (fixed mold part) 12 comes into contact. The side blocks 270A and 270B are provided with notches 272A and 272B through which the first electrode 60A and the second electrode 60B pass.

  In assembling the nested assembly 220, the first conductive means 250A and the second conductive means 250B are inserted into the notches 272A and 272B provided in the side blocks 270A and 270B. Furthermore, the first electrode 60A and the second electrode 60B are fixed to the notches 272A and 272B of the side blocks 270A and 270B by an appropriate means and method, and the nesting body 31 and the heat generating member are interposed between the side blocks 270A and 270B. 41 is sandwiched. In this state, the heat generating member 41 includes the first protrusion 274A provided on the top of the first side block 270A and the second protrusion provided on the top of the second side block 270B. It is fixed to the nest 230 by 274B. Then, the side blocks 270A and 270B are attached to the first mold part (movable mold part) 13 using bolts (not shown).

  The thermocouple as temperature measuring means is attached to the surface of the heat generating member 41 of such a nested assembly 220, and the temperature measurement result of the heat generating member 41 when current is passed through the heat generating member 41 is substantially the same as in the first embodiment. there were.

  Moreover, when injection molding was performed under the molding conditions in the same manner as in Example 1 using the mold assembly of Example 5, the same results as in Example 1 were obtained.

  In addition, as a fixing method of the heat generating member 41, alternatively, as shown in FIG. 1B, the heat generating member 41 is screwed into the heat generating member 41 and the insulating member penetrating the insert 230 is inserted. A method of fixing to the nest 230 with a bolt can also be adopted.

  Example 6 also relates to a mold assembly of the present invention, and more specifically, to a mold assembly having a fourth configuration. FIG. 10 shows a schematic cross-sectional view of the insert assembly in the mold assembly of the sixth embodiment. Moreover, the pattern of the 1st conduction | electrical_connection area | region, conduction | electrical_connection area extension part, and 2nd conduction | electrical_connection area | region in the metal mold | die assembly of Example 6 is shown to (A)-(B) of FIG.

  The basic configuration and structure of the mold assembly in the sixth embodiment are the same as the configuration and structure of the mold assembly described in the fifth embodiment. Further, in the sixth embodiment, the nest 330 includes a nest body 31 similar to the first embodiment, an insulating layer 33 similar to the first embodiment, a first conduction region 339A similar to the third embodiment, and a second. The conductive region 339B and the conductive region extending portion 339C.

  In the sixth embodiment, the nesting assembly 320 further includes a heat generating member 141 having the same configuration and structure as the heat generating member 41 of the first embodiment, the first side block 270A and the second second block of the fifth embodiment. The first side block 370A and the second side block 370B have the same configuration and structure as the side block 270B. Note that the last two digits of the reference numbers of the components of the first side block 370A and the second side block 370B are the configurations of the first side block 270A and the second side block 270B described in the fifth embodiment. The same reference numerals as the last two digits of an element indicate the same component.

  In the sixth embodiment, the heat generating member 141 is fixed on the insulating layer 33, the first conduction region 339A, the conduction region extension 339C, and the second conduction region 339B, and constitutes a part of the cavity 15. The first conductive region 339A, the conductive region extension 339C and the second conductive region 339B are heated by the heat transfer of Joule heat generated in the second conductive region 339B and the Joule heat generated in the heating member 141 itself. Further, in the first side block 370A, as in the first side block 270A in the fifth embodiment, the first conductive means 350A is provided on the surface facing the insert 330. Then, the first side block 370A is in contact with the first conductive region 339A and faces the first side surface 30A of the insert 330. The movable mold part) 13 is attached. On the other hand, in the second side block 370B, similarly to the second side block 270B in the fifth embodiment, the second conductive means 350B is provided on the surface facing the insert 330. The second side block 370B is in a state where the second conductive means 350B is in contact with the second conductive region 339B and faces the second side surface 30B opposite to the first side surface 30A of the insert 330. Is attached to a first mold part (movable mold part) 13. The configuration, structure, and formation method of the first conduction region 339A, the second conduction region 339B, and the conduction region extension 339C are the same as the first conduction region 139A, the second conduction region 139B, and the conduction method in the third embodiment. The configuration, structure, and formation method of the region extending part 139C can be the same. As in the fifth embodiment, the heat generating member 141 includes the first protrusion 374A provided on the top of the first side block 370A and the second protrusion provided on the top of the second side block 370B. The protrusions 374B are fixed to the insert 330.

  The first conductive means 350A is covered with an insulating film (not shown) except for the portion in contact with the first conductive region 339A and the portion in contact with the first electrode 60A (end surface 352A). Has been. In addition, the second conductive means 350B is also covered with an insulating film (not shown) except for the portion in contact with the second conductive region 339B and the portion in contact with the second electrode 60B (end surface 352B). Has been.

  Further, the configuration and structure of the first electrode 60A and the second electrode 60B can be the same as the configuration and structure of the first electrode 60A and the second electrode 60B described in the first embodiment. Detailed description is omitted, and the assembly of the nested assembly 320 can be the same as the assembly of the nested assembly 220 described in the fifth embodiment.

  When a thermocouple as a temperature measuring means is attached to the surface of the heat generating member 141 of such a nested assembly 320, and a current is passed through the first conduction region 339A, the conduction region extension 339C, and the second conduction region 339B The temperature measurement result of the heat generating member 141 was substantially the same as that of Example 1.

  Moreover, when injection molding was performed under the same molding conditions as in Example 1 using the mold assembly of Example 6, the same results as in Example 1 were obtained.

  Example 7 also relates to a mold assembly of the present invention, and more specifically, to a mold assembly having a fifth configuration. 12A and 12B are schematic cross-sectional views of the insert assembly in the mold assembly of Example 7. FIG. Here, FIGS. 12A and 12B are schematic cross-sectional views (although the cutting sites are different) that are substantially the same as those taken along the arrow AA in FIG. Moreover, the pattern of the 1st conduction | electrical_connection area | region, conduction | electrical_connection area extension part, and 2nd conduction | electrical_connection area | region in the metal mold | die assembly of Example 7 is shown to (A)-(B) of FIG.

  The basic configuration and structure of the mold assembly in the seventh embodiment are the same as the configuration and structure of the mold assembly described in the fifth embodiment. Furthermore, in the seventh embodiment, the nesting 430 includes a nesting body 31 similar to that in the first embodiment, an insulating layer 33 similar to that in the first embodiment, a first conduction region 439A similar to that in the third embodiment, The conductive region 439B and the conductive region extending portion 439C.

  In the seventh embodiment, the insert assembly 420 further includes a heat generating member 141 having the same configuration and structure as the heat generating member 41 of the first embodiment, the first side block 470A, and the second side block 470B. have. The last two digits of the reference numbers of the components of the first side block 470A and the second side block 470B are the configurations of the first side block 270A and the second side block 270B described in the fifth embodiment. The same reference numerals as the last two digits of an element indicate the same component.

  In the seventh embodiment, the heat generating member 141 is formed on the insulating layer 33, the first conductive region 439A, the conductive region extending portion 439C, and the second conductive region 439B in the same manner as the heat generating member 141 in the sixth embodiment. It is fixed and constitutes a part of the cavity 15, and heat transfer of Joule heat generated in the first conduction region 439A, the conduction region extension 439C and the second conduction region 439B, and is generated in the heat generating member 141 itself. Is heated by Joule heat. Also, the first side block 470A is slightly different from the first side block 270A in the fifth embodiment, and the first conductive means 450A and the second conductive means 450B are provided on the surface facing the insert 430. . The first conductive means 450A is in contact with the first conductive area 439A, the second conductive means 450B provided apart from the first conductive means 450A is in contact with the second conductive area 439B, and The first side block 470A is attached to the first mold part (movable mold part) 13 while facing the first side face 30A of the insert 430. On the other hand, the second side block 470B is also slightly different from the second side block 270B in the fifth embodiment, and is in a state of facing the second side surface 30B facing the first side surface 30A of the insert 430 in the first gold plate. A mold part (movable mold part) 13 is attached. The first conductive region 439A, the second conductive region 439B, and the conductive region extending portion 439C are configured, structured, and formed by the first conductive region 139A, the second conductive region 139B, and the conductive method in the third embodiment. The configuration, structure, and formation method of the region extending part 139C can be the same. As in the fifth embodiment, the heat generating member 141 includes the first protrusion 474A provided on the top of the first side block 470A and the second protrusion provided on the top of the second side block 470B. The protrusion 474B is fixed to the insert 430.

  The first conductive means 450A is covered with an insulating film (not shown) except for the portion in contact with the first conductive region 439A and the portion in contact with the first electrode 60A (end surface 452A). Has been. Further, the second conductive means 450B is also covered with an insulating film (not shown) except for the portion in contact with the second conductive region 439B and the portion in contact with the second electrode 60B (end surface 452B). Has been.

  Further, the configuration and structure of the first electrode 60A and the second electrode 60B can be the same as the configuration and structure of the first electrode 60A and the second electrode 60B described in the first embodiment. The detailed description is omitted, and the assembly of the nested assembly 420 can be the same as the assembly of the nested assembly 220 described in the fifth embodiment, and thus detailed description thereof is omitted.

  When a thermocouple, which is a temperature measuring means, is attached to the surface of the heat generating member 141 of such a nested assembly 420, and a current is passed through the first conduction region 439A, the conduction region extension 439C, and the second conduction region 439B. The temperature measurement result of the heat generating member 141 was substantially the same as that of Example 1.

  Moreover, when injection molding was performed under the same molding conditions as in Example 1 using the mold assembly of Example 7, the same results as in Example 1 were obtained.

The eighth embodiment is a modification of the first embodiment. In the eighth embodiment, a flow path 42 for cooling the heat generating member 41 by flowing a cooling medium is provided inside the heat generating member 41. Specifically, the cooling medium is room temperature water. 15A and 15B are schematic cross-sectional views of the heat generating member 41 that is substantially the same as that along the arrow A-A in FIG. 1A, and FIG. FIG. 16B is a schematic cross-sectional view of the same heat generating member 41 along the direction perpendicular to the arrow AA in FIG. 1A, and FIG. 16B is cut along a virtual plane perpendicular to the thickness direction. A schematic cross-sectional view of the heat generating member 41 is shown. The heat generating member 41 forms groove portions 42A and 42B by performing NC machining or electric discharge machining on each of the two SUS420J2 stainless steel plates 41A and 41B having a thickness of 2.5 mm (see (A in FIG. 15). In addition, an inlet-side manifold 43, an outlet-side manifold 45, an inlet-side port 44, and an outlet-side port 46 are provided (see FIG. 16A), and then the opposing surfaces of the two plate members 41A and 41B In the state where the convex portion and the convex portion, and the concave portion and the concave portion are combined, the two plate members 41A and 41B are bonded together by silver brazing (see FIG. 15B). The inlet side port 44 arranged at the inlet of the channel and the outlet port 46 arranged at the outlet of the channel are connected to a pipe (not shown). Incidentally, an air valve is attached to the pipe connected to the inlet side port 44, and the inside of the flow path 42 can be purged by opening the air valve for air blowing. In addition, the pipe connected to the outlet side port 46 is provided with a drain portion so that the cooling medium can be discharged when the inside of the flow path 42 is purged. Further, as shown in FIG. 16B, the projected shape of the flow path 42 is a linear shape, but is not limited to this, and a lattice shape, a spiral shape, a spiral shape, and a partial connection with each other. A concentric shape and a zigzag shape can be exemplified. Although the cross-sectional shape of the flow path is a rounded rectangle, the shape is not limited to this, and examples include a circle, an ellipse, a trapezoid, and a polygon. Further, in order to uniformly introduce the cooling medium into the plurality of flow paths 42, the inlet side manifold 43 has a cross-sectional area larger than the total cross-sectional area of the flow paths 42 , and the discharge portion of the flow paths 42 . The piping diameter of the outlet side manifold 45 is reduced.

The thickness (t ₁ ) of the heat generating member 41, the minimum remaining thickness (t ₂ ) on the cavity surface side of the heat generating member 41, the width (w ₁ ) of the flow path 42, and the shortest distance (w ₂ ) is as follows. The heat generating member 41 has a width of 80 mm and a length of 140 mm. W ₁ and w ₂ are average values.
t ₁ = 5.0 mm
t ₂ = 1.5mm
w ₁ = 3.0 mm
w ₂ = 2.0mm
The number of grooves extending in parallel was set to 14.

  When flowing the cooling medium through the flow path 42, an electromagnetic valve (these are not shown) is arranged in the pipe connected to the flow path 42, and the cooling medium is flowed into the flow path 42 by opening the electromagnetic valve. Can do. When the heat generating member 41 reaches the set temperature by cooling, the electromagnetic valve is closed, the air valve is opened, air is blown, the inside of the flow path 42 is purged, and the process proceeds to the next molding cycle.

Since the mold temperature was set to 50 ° C., the temperature of the heat generating member 41 immediately before the current flow was 50 ° C. When a current of 5 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 1.6 volts was generated at both ends of the heat generating member 41. The temperature of the central portion of the heat generating member 41 became 250 ° C. 10 seconds after the current began to flow. That is, the average temperature increase rate was 20 ° C./second, and the temperature increase rate could be improved as compared with the heat generating member 41 of Example 1 in which the flow path 42 was not provided. On the other hand, at the same time as the supply of current was stopped, water at 23 ° C. was passed through the flow path 42 at a rate of 2 liters / minute. As a result, the average cooling rate was 24 ° C./second.

  Moreover, when injection molding was performed under the same molding conditions as in Example 1 using the mold assembly in Example 8, the same results as in Example 1 were obtained.

  In the modification of the heat generating member 41 shown in FIG. 15C, an O-ring seal 47 is provided on the outer edge of the heat generating member 41, and the two plate members 41 A and 41 B are attached by bolts 48. It is concluded. By providing the O-ring seal 47, the flow path 42 does not communicate with the outside. The inner side of the outer edge portion of the heat generating member 41 may be joined or may not be joined. When not joined, the electrical resistance value of the part that is not joined is particularly high, so that the temperature raising rate can be further improved.

  In the modification of the heat generating member 41 shown in FIG. 15D, the flow path 42 is provided by forming a through hole directly in one plate material. In the modification of the heat generating member 41 shown in FIG. 15E, the height of the flow path 42 is changed depending on the position where the flow path 42 is provided.

  When no cooling medium is passed, the flow path 42 functions as a cavity for controlling the flow of current in the heat generating member 41.

  The flow path or cavity described above can be applied to the heat generating members 41 and 141 described in the second to seventh embodiments.

In Example 9, the material constituting the heat generating member was examined. Specifically, as in Example 1, the heating member was made of SUS420J2 having a thickness of 5.0 mm (referred to as Example 9A), and the surface of SUS420J2 having a thickness of 5.0 mm had a thickness of 0.1 mm. It is assumed that the copper plating layer is formed (referred to as Example 9B) and that made from titanium (Ti) having a thickness of 5.0 mm (referred to as Example 9C). The speed and temperature drop rate were measured. The size of the heating member was 150 mm × 100 mm, and a zigzag flow path (height 2.0 mm, width 3.0 mm , total extension about 1.5 m ) was formed inside. Room temperature water was used as a cooling medium. In Table 3, volume resistivity-1 is a value of volume resistivity at 20 ° C. (unit: μΩ · m), and volume resistivity-2 is a value of volume resistivity at 200 ° C. (unit: μΩ · m). ) And the unit of density is grams / cm ³ . The mold temperature was 50 ° C. In addition, a DC inverter power supply (16 KHz, DC pulse) having a maximum applied current of 6000 amperes and a maximum voltage of 8 volts was used as the power supply device.

[Table 3]
Volume resistivity-1 Volume resistivity-2 Density Example 9A 56 67 7.9
Example 9B 1.6 2.9 8.9
Example 9C 54 88 4.5

In Example 9A, when a current of 5 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 0.945 volts was generated at both ends of the heat generating member 41. When a current of 6 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 1.186 volts was generated at both ends of the heat generating member 41. The temperature increase rate and the temperature decrease rate at this time were as shown in Table 4. Similarly, in Example 9B, when a current of 5 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 0.538 volts was generated at both ends of the heat generating member 41. When a current of 6 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 0.78 volts was generated at both ends of the heat generating member 41. The temperature increase rate and the temperature decrease rate at this time were as shown in Table 4. Further, similarly, in Example 9C, when a current of 5 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 1.061 volts was generated at both ends of the heat generating member 41. When a current of 6 × 10 ³ amperes was passed through the heat generating member 41, a voltage of 1.302 volts was generated at both ends of the heat generating member 41. The temperature increase rate and the temperature decrease rate at this time were as shown in Table 4. In Table 4, the unit of current is ampere, and the rate of temperature rise is an average value obtained by dividing 150 ° C by the time from the start of current flow to the heat generating member until it reaches 200 ° C (unit: °). C / sec). Further, the temperature decrease rate −1 is an average value (unit: ° C / second) obtained by dividing the temperature difference by the time required to decrease to 50 ° C after the supply of current to the heating member is stopped. The temperature drop rate when water is flowing through the flow path, and the temperature drop rate -2 is an average obtained by dividing the temperature difference by the time required to drop to 100 ° C after the supply of current to the heating member is stopped. It is a value (unit: ° C / sec) and is the temperature lowering rate when water is not flowing through the flow path.

[Table 4]
Current Temperature increase rate Temperature decrease rate-1 Temperature decrease rate-2
Example 9A 5 × 10 ³ 20 26 2.3
Example 9A 6 × 10 ³ 27 28 2.3
Example 9B 5 × 10 ³ 12 24 2.6
Example 9B 6 × 10 ³ 16 25 2.6
Example 9C 5 × 10 ³ 32 29 2.0
Example 9C 6 × 10 ³ 38 30 2.0

  From the above results, the heating member formed with the plating layer tended to have a slightly higher heating rate than the heating member without the plating layer, but this was not a problem. The reason why the temperature rise rate is slightly slower is that the electric resistance value of the plating layer is slightly high, so that the current flows preferentially to the heat generating member, and the plating layer absorbs the temperature that the heat generating member has generated heat in advance. This is probably because On the other hand, when the heat generating member was made of titanium, it was found that both the temperature raising rate and the temperature lowering rate were superior to those of the heat generating member made of SUS420J2.

  As mentioned above, although this invention was demonstrated based on the preferable Example, this invention is not limited to these Examples. The structure of the mold assembly, the structure of the insert assembly, the structure, the structure of the insert, the structure, the thermoplastic resin used, the injection molding conditions, etc. in the examples are examples and can be changed as appropriate.

  For example, in Examples 1 to 4, an example in which the ceramic material layer is formed on the side block facing the side surface of the nest is shown, but alternatively, shown in Examples 5 to 7. Similarly, the ceramic material layer can be formed inside the side block. Moreover, in Example 5-7, although the example in which the ceramic material layer was formed in the inside of the side block was shown, as in the case of Example 1-Example 4, the nested It can be set as the structure by which the ceramic material layer is formed in the surface of the side block which faced the side surface.

  In the embodiment, the heat generating member and the first electrode are indirectly connected using the first conductive means, and the heat generating member and the second electrode are indirectly connected using the second conductive means. Although connected, in some cases, the first conductive means and the first electrode may be manufactured as an integral member, and the second conductive means and the second electrode may be manufactured as an integral member. it can. Alternatively, the heat generating member and the first electrode are directly connected using an insulating bolt or a conductive bolt, and the heat generating member and the second electrode are connected using an insulating bolt or a conductive bolt. You can also connect directly.

That is, in the example shown in FIGS. 17A to 17C, the heat generating member 41 and the first electrode 60A are directly connected by the insulating bolt 35A. The second electrode 60B is directly connected by an insulating bolt 35A. In the example shown in FIG. 18A, the heat generating member 41 and the first electrode 60A are directly connected by an insulating bolt 35A, and the heat generating member 41 and the second electrode 60B are connected. Is directly connected by an insulating or conductive bolt 35B. Furthermore, in the example shown in FIG. 18B, the heat generating member 41 and the first electrode 60A are directly connected by an insulating bolt 35A. The electrode 60B is directly connected by an insulating or conductive bolt 35B, but a side block 70A is arranged for fixing the heat generating member 41. In the example shown in FIG. 18C, the heat generating member 41 and the first electrode 60A are directly connected by an insulating bolt 35A, and the heat generating member 41 and the second electrode are connected. 60B is indirectly connected by a conductive bolt 35C, and side blocks 70A and 70B are arranged for fixing the heat generating member 41. Needless to say, a flow path or a cavity may be provided for the heat generating member of these modified examples. Moreover, the modification example of the heat generating member described above is an exemplification, and needless to say, various changes and modifications are possible.

1A is a schematic perspective view of a nesting assembly in the mold assembly of the first embodiment, and FIG. 1B is along an arrow AA in FIG. It is a typical sectional view. (A), (B), and (C) of FIG. 2 are a schematic perspective view when a nesting body and the like in the mold assembly of Example 1 are cut, and a schematic perspective view of a side block, FIG. 3 is a schematic perspective view of a first electrode. FIG. 3 is a schematic perspective view of the nesting body and the like before assembly in the mold assembly according to the first embodiment. 4A and 4B are conceptual diagrams of the mold assembly and the entire injection molding apparatus, respectively. FIG. 5 is a schematic cross-sectional view of the insert assembly in the mold assembly of the second embodiment. 6A is a schematic cross-sectional view of the nesting assembly in the mold assembly of Example 3, and FIG. 6B shows the nesting main body and the like in the mold assembly of Example 3. It is a typical perspective view when cut. FIGS. 7A to 7C are diagrams schematically showing patterns of the first conduction region, the conduction region extension portion, and the second conduction region in the mold assembly of Example 3. FIG. FIG. 8 is a schematic cross-sectional view of the nesting assembly in the mold assembly of the fourth embodiment. FIG. 9A is a schematic cross-sectional view of a nesting assembly in the mold assembly of Example 5, and FIG. 9B is a schematic perspective view of a side block. FIG. 10 is a schematic cross-sectional view of the insert assembly in the mold assembly of the sixth embodiment. FIGS. 11A and 11B are diagrams schematically showing patterns of a first conduction region, a conduction region extending portion, and a second conduction region in the mold assembly of Example 6. FIG. 12A and 12B are schematic cross-sectional views of the insert assembly in the mold assembly of Example 7. FIG. FIGS. 13A and 13B are diagrams schematically showing patterns of a first conduction region, a conduction region extending portion, and a second conduction region in the mold assembly of Example 7. FIG. FIG. 14 is a graph showing the results of measuring the temperature of the heat generating member when current is passed through the heat generating member in the nested assembly of Example 1. 15A to 15E are schematic cross-sectional views of a heat generating member provided with a flow path for flowing a cooling medium. 16A is a schematic cross-sectional view similar to that of the heat generating member taken along the direction perpendicular to the arrow AA in FIG. 1A, and FIG. It is typical sectional drawing when a heat-emitting member is cut | disconnected by the virtual plane perpendicular | vertical to the thickness direction. 17A to 17C are schematic sectional views of modified examples of the heat generating member. 18A to 18C are schematic cross-sectional views of other modified examples of the heat generating member.

Explanation of symbols

10 ... Injection cylinder, 11 ... Screw, 12 ... Second mold part (fixed mold part), 13 ... First mold part (movable mold part), 14 ... -Molten resin injection part (gate part), 15 ... cavity, 16A ... fixed platen, 16B ... movable platen, 17 ... tie bar, 18 ... hydraulic cylinder for clamping, 19 ... Hydraulic piston, 20, 120, 220, 320, 420 ... nested assembly, 30, 130, 230, 330, 430 ... nested, 30A, 30B ... side of the nested, 31 ... nested body, 32, 32 '... lower insulating layer, 33, 33' ... insulating layer, 34 ... through hole, 35, 35A, 35B, 35C ... bolt, 36 ... holding plate, 37 ...・ Through hole, 38 ... mounting hole, 41, 141 ... Thermal member, 41A, 41B ... plate material, 42 ... flow path, 42A, 42B ... groove, 43 ... inlet side manifold, 44 ... inlet side port, 45 ... outlet side manifold, 46 ... Exit side port, 47 ... O-ring seal, 48 ... Bolt, 50A, 80A, 250A, 350A ... First conductive means, 50B, 80B, 250B, 350B ... Second , 51A, 51B, 81A, 81B... First end, 52A, 52B, 82A, 82B... Second end, 352A, 352B, 452A, 452B. ... 1st electrode, 60B ... 2nd electrode, 61A, 61B ... Insulating film, 62A, 62B ... Mounting hole, 63A, 63B ... Bolt, 64A, 64B ... Wiring 70A, 70B, 70A, 270B, 370A, 370B, 470A, 470B ... side block, 71A, 71B, 271A, 271B, 371A, 371B, 471A, 471B ... ceramic material layer, 72A, 72B, 272A, 272B, 372A, 372B , 472A, 472B... Notches of side blocks, 73A, 73B, 273A, 273B, 373A, 373B, 473A, 473B... Tops of side blocks, 74A, 74B, 274A, 274B, 374A, 374B, 474A, 474B: Side block protrusions, 75A, 75B, 275A, 275B, 375A, 375B, 475A, 475B ... Side surfaces of side block protrusions, 139A, 139B, 339A, 339B, 439A, 439B ... Continuity Area, 139C, 339C, 439C ... conduction area extension, 252A, 252B, 352A, 352B, 452A, 452B ... end face of the conductive means

Claims (13)

(A) A mold that includes a first mold part and a second mold part, and in which a cavity is formed by clamping the first mold part and the second mold part,
(B) a nesting assembly having a nesting disposed in the first mold part; and
(C) a first electrode and a second electrode;
A mold assembly comprising:
Nesting is
(B-1) nested body, and
(B-2) an insulating layer formed on the top surface of the nested body facing the cavity;
Consists of
The nested assembly is further
(B-1) A heating member that is electrically connected to the first electrode and the second electrode, is fixed on the insulating layer, forms part of the cavity, and generates Joule heat;
(B-2) It has a first end and a second end, is disposed inside the nest, penetrates through the insulating layer, and the heat generating member and the first end are in contact with each other. First conductive means for passing current; and
(B-3) having a first end and a second end, disposed inside the insert, penetrating the insulating layer and contacting the heat generating member and the first end; A second conductive means for passing current ,
The first electrode is in contact with the exposed second end of the first conductive means;
The second electrode is in contact with the exposed second end of the second conductive means;
The heat generating member is electrically connected to the first electrode via the first conductive means and electrically connected to the second electrode via the second conductive means. Mold assembly. (A) A mold that includes a first mold part and a second mold part, and in which a cavity is formed by clamping the first mold part and the second mold part,
(B) a nesting assembly having a nesting disposed in the first mold part; and
(C) a first electrode and a second electrode;
A mold assembly comprising:
Nesting is
(B-1) nested body,
(B-2) an insulating layer formed on the top surface of the nested body facing the cavity, and
(B-3) a first conduction region, a second conduction region, and a conduction region extending portion connecting the first conduction region and the second conduction region formed on the insulating layer;
Consists of
The nested assembly is further
(B-1) A heating member that is electrically connected to the first electrode and the second electrode, is fixed on the insulating layer, forms part of the cavity, and generates Joule heat;
Consists of
The heat generating member is fixed on the insulating layer, the first conduction region, the conduction region extension portion, and the second conduction region, and constitutes a part of the cavity. The first conduction region, the conduction region extension portion, and the first conduction region Heated by Joule heat generated in two conduction regions and Joule heat generated in itself,
The nested assembly is further
(B-2) It has a first end and a second end, is arranged inside the nest, the first conduction region and the first end are in contact, and the first conduction region First conductive means for passing current; and
(B-3) It has a first end portion and a second end portion, is arranged inside the nest, the second conduction region and the first end portion are in contact, and the second conduction region A second conductive means for passing current;
Have
The first electrode is in contact with the exposed second end of the first conductive means;
The second electrode is in contact with the exposed second end of the second conductive means;
Heating member is a first electrode and electrically connected through the first conducting means, and characterized in that it is connected to the second electrode via the second conductive means Mold assembly. The electric resistance value at 20 ° C. of the material constituting the heat generating member is R ₁ , and the electric resistance value at 20 ° C. of the material constituting the first conductive region, the second conductive region, and the conductive region extending portion is R _2. When
R ₁ / R ₂ ≧ 1
The mold assembly according to claim 2 , wherein: The mold assembly according to any one of claims 1 to 3, wherein a cavity for controlling a flow of current in the heat generating member is provided in the heat generating member. The mold assembly according to any one of claims 1 to 3, wherein a flow path for cooling the heat generating member by flowing a cooling medium is provided inside the heat generating member. Solid. It further comprises a side block attached to the first mold part in a state facing the side surface of the nesting,
Thermal conductivity is 1.3 (W / m · K) to 6.3 (W / m · K) on the side of the side block facing the side surface of the nest or inside the side block. The mold assembly according to any one of claims 1 to 5 , wherein a ceramic material layer having a thickness of 0.5 mm to 5 mm is formed. (A) A mold that includes a first mold part and a second mold part, and in which a cavity is formed by clamping the first mold part and the second mold part,
(B) a nesting assembly having a nesting disposed in the first mold part; and
(C) a first electrode and a second electrode;
A mold assembly comprising:
Nesting is
(B-1) nested body, and
(B-2) an insulating layer formed on the top surface of the nested body facing the cavity;
Consists of
The nested assembly is further
(B-1) A heating member that is electrically connected to the first electrode and the second electrode, is fixed on the insulating layer, forms part of the cavity, and generates Joule heat;
(B-2) The first conductive means is provided on the surface facing the nesting, the first conductive means is in contact with the heat generating member, and the first conductive means faces the first side surface of the nesting. A first side block attached to the mold part of
(B-3) The second conductive means is provided on the surface facing the nest, the second conductive means is in contact with the heat generating member, and the second side facing the first side of the nest A second side block attached to the first mold part in a face-to-face state,
Consists of
The first electrode is in contact with the first conductive means;
The second electrode is in contact with the second conductive means;
Heating member is a first electrode and electrically connected through the first conducting means, and characterized in that it is connected to the second electrode via the second conductive means Mold assembly. (A) A mold that includes a first mold part and a second mold part, and in which a cavity is formed by clamping the first mold part and the second mold part,
(B) a nesting assembly having a nesting disposed in the first mold part; and
(C) a first electrode and a second electrode;
A mold assembly comprising:
Nesting is
(B-1) nested body,
(B-2) an insulating layer formed on the top surface of the nested body facing the cavity, and
(B-3) a first conduction region, a second conduction region, and a conduction region extending portion connecting the first conduction region and the second conduction region formed on the insulating layer;
Consists of
The nested assembly is further
(B-1) A heating member that is electrically connected to the first electrode and the second electrode, is fixed on the insulating layer, forms part of the cavity, and generates Joule heat;
Consists of
The heat generating member is fixed on the insulating layer, the first conduction region, the conduction region extension portion, and the second conduction region, and constitutes a part of the cavity. The first conduction region, the conduction region extension portion, and the first conduction region Heated by Joule heat generated in two conduction regions and Joule heat generated in itself,
The nested assembly is further
(B-2) In the state where the first conductive means is provided on the surface facing the nesting, the first conductive means is in contact with the first conductive region and faces the first side surface of the nesting. A first side block attached to the first mold part, and
(B-3) The second conductive means is provided on the surface facing the nest, the second conductive means is in contact with the second conduction region, and the second opposite to the first side surface of the nest A second side block attached to the first mold part while facing the side surface of
Have
The first electrode is in contact with the first conductive means;
The second electrode is in contact with the second conductive means;
Heating member is a first electrode and electrically connected through the first conducting means, and characterized in that it is connected to the second electrode via the second conductive means Mold assembly. (A) A mold that includes a first mold part and a second mold part, and in which a cavity is formed by clamping the first mold part and the second mold part,
(B) a nesting assembly having a nesting disposed in the first mold part; and
(C) a first electrode and a second electrode;
A mold assembly comprising:
Nesting is
(B-1) nested body,
(B-2) an insulating layer formed on the top surface of the nested body facing the cavity, and
(B-3) a first conduction region, a second conduction region, and a conduction region extending portion connecting the first conduction region and the second conduction region formed on the insulating layer;
Consists of
The nested assembly is further
(B-1) A heating member that is electrically connected to the first electrode and the second electrode, is fixed on the insulating layer, forms part of the cavity, and generates Joule heat;
Consists of
The heat generating member is fixed on the insulating layer, the first conduction region, the conduction region extension portion, and the second conduction region, and constitutes a part of the cavity. The first conduction region, the conduction region extension portion, and the first conduction region Heated by Joule heat generated in two conduction regions and Joule heat generated in itself,
The nested assembly is further
(B-2) The first conductive means and the second conductive means are provided on the surface facing the nest, and the first conductive means is in contact with the first conductive region and is separated from the first conductive means. A first side block attached to the first mold part in a state where the second conductive means provided in contact with the second conductive region and faces the first side surface of the nest; And
(B-3) a second side block attached to the first mold part in a state of facing the second side surface facing the first side surface of the nest;
Have
The first electrode is in contact with the first conductive means;
The second electrode is in contact with the second conductive means;
Heating member is a first electrode and electrically connected through the first conducting means, and characterized in that it is connected to the second electrode via the second conductive means Mold assembly. The electric resistance value at 20 ° C. of the material constituting the heat generating member is R ₁ , and the electric resistance value at 20 ° C. of the material constituting the first conductive region, the second conductive region, and the conductive region extending portion is R _2. When
R ₁ / R ₂ ≧ 1
The mold assembly according to claim 8 or 9 , wherein the mold assembly is satisfied. Each of the first side block and the second side block has a thermal conductivity of 1.3 (W / m · K) to 6.3 (W / m · K) and a thickness of 0. The mold assembly according to any one of claims 7 to 10 , wherein a ceramic material layer having a thickness of 5 mm to 5 mm is formed. The volume resistivity at 20 ° C. of the material constituting the heat generating member is 0.017 μΩ · m to 1.5 μΩ · m,
The mold assembly according to any one of claims 1 to 11 , wherein a thickness of the heat generating member is 0.1 mm to 20 mm. Disposed in the first mold portion and / or the second mold part, any one of claims 1 to 12, characterized in that it further comprises a molten resin injection portion communicating with the cavity The mold assembly according to 1.

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