JP2008114402A - Injection molding mold, method for producing injection molding mold, and molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding mold which is easy in the processing of a parting mold having a heating medium channel, can easily secure strength, and is easily miniaturized. <P>SOLUTION: The injection molding mold 10 has heating medium channels 16b and 16d. The parting mold 12 has a first mold component 17 having a mold surface 14 and a second mold component 18 arranged on the back of the first mold component 17. The first mold component 17 and the second mold component 18 are contacted with plane-like mating faces 19 and 20 to be composed. A three-dimensional shape surface 14b is formed on the mold surface 14 of the first mold component 17. On the side of the mating face of the first mold component 17, grooves 21b and 21d for the channels whose depths change along the uneven shape of the three-dimensional shape surface 14b are formed, and an engagement body 25 engaged with the grooves 21b and 21d for the channels is provided. By contact between the first mold component 17 and the second mold component 18 while the engagement body 25 is engaged, the heating medium channels 16b and 16d are formed between the engagement body 25 and inner walls of the grooves 21b and 21d for the channels. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an injection mold in which a heat medium flow path through which a heat medium can flow is provided along a mold surface, a method of manufacturing the injection mold, and molding using the injection mold With respect to methods.

  In an injection mold, a heat medium flow path for heating or cooling a mold is usually provided inside a part or all of a plurality of divided molds having a mold surface.

  For example, in the injection mold as shown in FIGS. 7A to 7C, the upper split mold 51 and the lower split mold 52 are provided with mold surfaces 54a and 54b for forming cavities 53, respectively. Heat medium flow paths 56a and 56b that extend linearly in the longitudinal direction are respectively provided in the interior of the split molds 51 and 52 close to the mold surfaces 54a and 54b, and the heat medium is supplied to the heat medium flow paths 56a and 56b. , Supply parts 57a and 57b for discharging and discharge parts 58a and 58b are provided.

  In such an injection mold, the three-dimensional surfaces 54c and 54d of the mold surfaces 54a and 54b have different distances from the heat medium flow paths 56a and 56b at each position. Heat exchange with the surfaces 54a and 54b tends to be uneven. Therefore, a temperature difference is generated between the surfaces of the mold surfaces 54a and 54b, the appearance quality of the obtained molded product is easily deteriorated, deformation due to the shrinkage difference is likely to occur, and the molding cycle is likely to be long.

  Further, Patent Document 1 below proposes a mold in which a heat medium flow path is formed along the three-dimensional shape surface of the mold surface.

  In this mold, a nest having a molding portion as a mold surface is fitted to the fitting surface of the concave portion of the mold base, and the fitting surface of the mold base is fitted to the fitting surface. The back surface of the insert is formed in a shape along the molding part, and a heat medium flow path is formed therebetween. Therefore, it is possible to form the heat medium flow path along the mold surface.

Here, in order to form the heat medium flow path as close as possible to the mold surfaces 54a and 54b, the thickness between the mold surface and the back surface of the nest is formed thin, and the strength of the nest is likely to be insufficient. Therefore, in this mold, the strength of the nesting is reinforced by providing reinforcing ribs on the back surface of the nesting. Furthermore, uniform heat exchange is performed by partitioning the fitting surface of the mold base and the back surface of the nesting into a plurality of partition units and flowing the heat medium with the reinforcing ribs.
Japanese Patent Laid-Open No. 2002-1770

  However, in such a conventional mold, since the fitting surface of the mold base and the back surface of the insert are in the shape along the mold surface, each of these surfaces has a three-dimensional shape. Therefore, when processing, it must be processed using a special processing machine, etc., and the fitting surface of the mold base and the back surface of the nesting are fitted in the direction in which the injection pressure and clamping force are generated. Therefore, each surface has to be processed with high accuracy, and it is difficult to manufacture a mold.

  Here, in order to ensure sufficient strength of the nesting, it is necessary to provide a sufficiently large reinforcing rib, and also to provide a peripheral portion that can secure sufficient strength around it. As a result, the nesting was likely to be large, and the mold was likely to be large.

  Therefore, an object of the present invention is to provide an injection mold that can flow a heat medium along a mold surface with a simple configuration and that is easy to achieve strength while ensuring strength. It is another object to provide a method for easily producing such an injection mold, and to provide a molding method using such an injection mold.

  An injection mold according to the present invention that solves the above-described problems includes an injection mold having a plurality of split molds having a mold surface, and a heat medium flow path through which a heat medium can flow inside at least one of the plurality of split molds. In the molding die, the split mold having the heat medium flow path includes a first mold part having the mold surface and a second mold part disposed on the back surface of the first mold part, The first mold part and the second mold part are formed by contacting flat mating surfaces formed on the first mold part and the mold surface of the first mold part, respectively, and the distance between the mating surface and the mold surface Is formed, and on the mating surface side of the first mold part is formed a channel groove whose depth changes along the uneven shape of the three-dimensional shape surface, A fitting body having a shape corresponding to the bottom of the channel groove and fitted into the channel groove; When the mating surfaces of the first mold part and the second mold part are brought into contact with each other in the state of being fitted in the flow path groove, the gap between the fitting body and the flow path groove is obtained. Further, the heat medium flow path having a substantially constant cross-sectional area at each position is formed.

  In addition to the structure of Claim 1, the injection mold according to Claim 2 is characterized in that the flow path groove is a distance between a bottom portion at each position of the flow path groove and the three-dimensional shape surface. Is formed substantially constant.

  In addition to the structure of Claim 1 or 2, the injection mold according to Claim 3 is characterized in that the flow path groove includes a stepped recess formed on the opening side, and the mold surface side from the stepped recess. And the fitting body includes a flange portion that is accommodated in the stepped recess and an insertion portion that is inserted into the channel forming recess, and the flow path forming recess. And the insertion portion is formed with the heat medium flow path.

  A method for manufacturing an injection mold according to claim 4 is the method for manufacturing an injection mold according to any one of claims 1 to 3, wherein a first flat plate is formed on the back side of the mold surface. Forming a flow path groove on the first mating surface side to produce the first mold part, and forming a second mating surface having a flat surface to form the first mating surface. A step of producing a mold part of 2, a step of producing a fitting body having a shape corresponding to a bottom portion of the flow channel groove and capable of being fitted into the flow channel groove, By fitting a fitting body, bringing the first mating surface and the second mating surface into contact with each other, and assembling the first mold part, the second mold part, and the fitting body, And a step of forming the heat medium flow path having a substantially constant cross-sectional area at each position between the fitting body and the flow path groove.

  A molding method according to a fifth aspect is characterized in that a resin is molded using the injection mold according to any one of the first to third aspects.

  In addition to the structure of claim 5, the molding method of claim 6 injects molten resin into the injection mold while changing the mold temperature by flowing the heat medium through the heat medium flow path. And solidify.

  According to the injection mold of claim 1, the split mold is configured such that the first mold part having the mold surface and the second mold part are brought into contact with each other at a planar mating surface. A flow path groove having a depth along the uneven shape of the three-dimensional shape surface of the mold surface is formed on the mating surface side of the one mold part, and a fitting body having a shape corresponding to the bottom of the flow path groove is provided. The fitting body is fitted into the channel groove, and the first mold part and the second mold part are brought into contact with each other at the mating surface, so that the heat medium flow is between the fitting body and the channel groove. Since the path is formed, it is easy to manufacture a split mold having a heat medium flow path along the mold surface.

  That is, since the flow channel groove is formed from the mating surface of the first mold part, the flow channel groove is shallower than that formed from the rear surface of the split mold, so that the processing amount is small and easy to form. . At the same time, since the mating surfaces of the first and second mold parts are formed in a planar shape, it is easier to form a mating surface with a desired accuracy than a three-dimensional shape. Therefore, it is easy to process, and it is easy to manufacture a split mold having a heat medium flow path along the mold surface.

  Further, since the mating surface of the first mold part is planar, even if the mold surface of the first mold part has a heat medium flow path along the three-dimensional shape surface, the entire first mold part It is easy to secure the wall thickness, and it is easy to secure sufficient strength of the first mold part. At the same time, since the mating surface of the first and second mold parts is planar, it can be formed with a desired accuracy in a wide range, and the first and second mold parts can be brought into contact with each other in a wide range. The strength of the split type having the heat medium flow path can be easily ensured.

  As a result, it is possible to provide an injection mold that is easy to process a split mold having a heat medium flow path, easily secures strength, and that can be easily downsized with a simple configuration.

  According to the injection molding die of claim 2, since the distance between the bottom portion and the three-dimensional shape surface at each position of the channel groove is formed substantially constant, uniform heat exchange is possible. The mold surface of the injection mold is more easily heated or cooled during resin molding.

  According to the injection molding die according to claim 3, the flow path groove includes the step recess and the flow path forming recess that is recessed from the step recess, and the fitting body can be fitted into the step recess, and the flow path Since the insertion portion is inserted into the formation recess, the fitting body can be easily fitted at a predetermined position in the depth direction of the channel groove, and a desired heat medium channel can be easily formed. be able to.

  According to the method for manufacturing an injection mold according to claim 4, when producing a first mold part having a mold surface, a planar first mating surface is formed on the back side of the mold surface, Since the flow channel groove is formed on the first mating surface side, the flow channel groove is shallower than the case where the flow channel groove is formed from the rear surface of the split mold, so that the amount of processing is small and processing is possible. Easy.

  Further, since the mating surfaces of the first and second mold parts are each formed in a planar shape, it is easy to process with a desired accuracy in a wide range compared to processing into a three-dimensional shape.

  Therefore, an injection mold having a split mold having a heat medium channel can be easily manufactured.

  According to the method for molding a resin molded product according to claim 5 or 6, the flow path groove along the three-dimensional shape surface of the mold surface is formed in the first mold part, and the flow path groove Since the heat medium flow path is formed by the above, the heat medium can flow along the three-dimensional shape surface. Therefore, it is easy to efficiently and uniformly heat and cool the mold surface, and it is possible to improve the appearance quality of the obtained molded product and shorten the molding cycle.

  Embodiments of the present invention will be described below.

  1 to 6 show an injection mold according to this embodiment.

  As shown in FIGS. 1 to 3, the injection mold 10 is composed of an upper split mold 11 and a lower split mold 12, and the upper split mold 11 and the lower split mold 12 are clamped. Thus, mold surfaces 14 and 15 capable of forming the cavity 13 are formed, respectively.

  Each of the mold surfaces 14 and 15 has a shape corresponding to the resin molded product. In this embodiment, a planar base surface 14a or 15a and a tertiary protruding or recessed from the base surface 14a or 15a. The three-dimensional shape surfaces 14b and 15b having the original shape are included.

  In this embodiment, as shown in FIG. 1, five heat medium flow paths 16 a to 16 e through which a heat medium such as air, water, oil, and steam can flow in the lower split mold 12 are seen in a plan view. They are formed parallel to each other.

  The lower split mold 12 includes a first mold part 17 having a mold surface 14 and heat medium flow paths 16a to 16e, and a second mold having a plate shape disposed on the back surface of the first mold part 17. A part 18 and a fitting body 25 fitted to flow path grooves 21b and 21d described later of the first mold part 17 are provided.

  As shown in FIGS. 4 and 5, the first mold part 17 includes a split surface 12 a and a mold surface 14 of the lower split mold 12 on one side, and is divided on the back side of the split surface 12 a and the mold surface 14. A first mating surface 19 composed of a plane parallel to the surface 12a is provided on substantially the entire surface. In addition, heat medium flow paths 16a, 16c, and 16e each having a hole having a linear axis are formed along the flat base surface 14a.

  Furthermore, flow path grooves 21b and 21d for forming the heat medium flow paths 16b and 16d are formed in the first mating surface 19 so as to open. The channel grooves 21b and 21d are formed along the base surface 14a of the mold surface 14 and the two semi-dimensionally projecting three-dimensional surfaces 14b so as to fit the fitting body 25 at a predetermined position. In addition, there are stepped recesses 23b and 23d on the opening side, and flow path forming recesses 24b and 24d that are recessed on the mold surface 14 side with a narrower width than the stepped recesses 23b and 23d.

  Since the distance between the base surface 14a and the first mating surface 19 is substantially constant at the portion corresponding to the base surface 14a, the depth of the flow path forming recesses 24b and 24d of the flow path grooves 21b and 21d is set at each position. In FIG. At the portion corresponding to the three-dimensional shape surface 14b, the distance between the three-dimensional shape surface 14b and the first mating surface 19 changes, so that the depths of the flow path forming recesses 24b and 24d of the flow path grooves 21b and 21d are reduced. It changes along the uneven shape of the three-dimensional shape surface 14b.

  Thereby, in the full length of the groove | channels 21b and 21d for flow paths, the distance between the bottom parts 21y and 21z and the type | mold surface 14 in each position is substantially constant. The step recesses 23b and 23d are formed at a substantially constant depth all around the flow path forming recesses 24b and 24d.

  The flow path grooves 21b and 21d are formed in a range that does not reach the periphery of the first mold part 17, and between each end portion side and the periphery of the first mold part 17, A continuous edge reinforcing portion 17a is provided so that the peripheral thickness of one mold part is constant.

  As shown in FIGS. 6 (a) to 6 (c), the fitting body 25 fitted into the flow path grooves 21b and 21d is a flange portion that can be inserted into the step recesses 23b and 23d of the flow path grooves 21b and 21d. 26 and an insertion protrusion 27 that is formed so as to protrude from the flange portion 26 on one side and can be inserted into the flow path forming recesses 24b and 24d. Further, on both end sides, a through hole 28 having a diameter substantially equal to the width of the insertion protrusion 27 so as to pass through the flange portion 26 and the insertion protrusion 27, and an end portion side of each through hole 28 is disposed. And a projecting piece 29 projecting from the one side. The projecting piece 29 makes contact with the longitudinal ends of the channel grooves 21b and 21d to facilitate alignment of the fitting body 25 with the channel grooves 21b and 21d in the longitudinal direction.

  The flange portion 26 is formed in substantially the same shape as the step recesses 23b and 23d, the back surface 26a opposite to the insertion protrusion 27 is flat, and the thickness is equal to the depth of the step recesses 23b and 23d. Is formed. Therefore, in a state where the fitting body 25 is fitted in the flow path grooves 21b and 21d, the back surface 26a and the first mating surface 19 of the first mold part 17 are arranged on substantially the same plane. Yes.

  The insertion protrusion 27 is formed so as to protrude from the flange portion 26 to the one side with a width substantially equal to the flow path forming recesses 24b and 24d, and the edges facing the bottom portions 21y and 21z of the flow path grooves 21b and 21d are , And has a shape corresponding to the shape of the bottom portions 21y and 21z of the channel grooves 21b and 21d.

  The amount of protrusion of the insertion protrusion 27 from the flange portion 26 is formed to be shorter than the depth of the flow path forming recesses 24b and 24d, and is disposed at a position corresponding to the base surface 14a of the flow path forming recesses 24b and 24d. In the portion 27a, the amount of protrusion at each position from the flange portion 26 is constant, and in the portion 27b arranged at a position corresponding to the three-dimensional shape surface 14b, the amount of protrusion at each position becomes the uneven shape of the three-dimensional shape surface 14b. It changes along and protrudes from a portion 27a corresponding to the base surface 14a.

  In this fitting body 25, by setting such an amount of protrusion, the edge of the insertion protrusion 27 and the bottoms 21y and 21z of the flow path grooves 21b and 21d are separated at a substantially constant distance at each position. Can be opposed.

  Further, the fitting body 25 can be formed of the same material as that of the first mold part 17, but is formed of a material having a thermal conductivity higher than that of the first mold part 17. Is preferred. This is because the heat exchange efficiency of the entire first mold part 17 can be improved.

  In addition, since the fitting body 25 does not require so much structural strength, it is generally formed not only from a mold steel material used for injection molding of a thermoplastic resin but also from a material such as metal, plastic, rubber, etc. having low rigidity. You can also

  On the other hand, the second mold part 18 is provided with a second mating surface 20 formed of a flat surface on substantially the entire surface of the first mold part 17 facing the first mating surface 19. Inside, a supply path 31 for supplying the heat medium to the heat medium flow paths 16a to 16e and a discharge path 32 for discharging the heat medium are provided. Openings 31a and 32a are opened.

  The openings 31a and 32a are provided at positions corresponding to both ends of the flow path grooves 21b and 21d of the first mold part 17 or the heat medium flow paths 16a, 16c and 16e. The flow path grooves 21b and 21d are provided at positions corresponding to the respective through holes 28 of the fitting body 25, and the heat medium flow paths 16a, 16c and 16e correspond to the openings 33a of the extension paths 33 extended from these. In the position.

  In the lower split mold 12 including the first mold part 17, the second mold part 18 and the fitting body 25, the fitting body 25 is fitted into the channel grooves 21 b and 21 d, and the first mold part The first mating surface 19 of the second mold part 18 is brought into contact with the second mating surface 20 of the second mold part 18, and the mating surface 20 of the second mold part 18 is brought into contact with the back surface 26 a of the flange portion 26 of the fitting body 25. Are configured to contact each other. As a result, the opening sides of the flow path grooves 21b and 21d are closed, and the heat medium flow paths 16b and 16d are formed by the fitting body 25 and the inner walls of the flow path grooves 21b and 21d.

  The first and second shaped parts 17 and 18 can be generally formed from a mold steel material used for a thermoplastic resin injection mold.

  The injection mold 10 having such a configuration can be manufactured as follows.

  First, holes that are substantially parallel to the first mating surface 19 are formed in a predetermined workpiece that can form the first mold part 17 to form the heat medium channels 16a, 16c, and 16e. A first mold having flow channel grooves 21b and 21d formed on one mating surface 19 side, a split surface 12a and a mold surface 14 on one side, and a first mating surface 19 on the other back side. The component 17 is produced. In this embodiment, the heat medium passages 16a, 16c, and 16e are formed with an extension passage 33 extending to the first mating surface 19 and an opening 33a thereof.

  In the production of the first mold part 17, the thickness between the dividing surface 12 a and the first mating surface 19 can be selected as appropriate. The depth of the grooves 21b and 21d can be reduced to reduce the processing amount, and the injection mold 10 can be easily downsized.

  In addition, since the channel grooves 21b and 21d are formed so as to follow the shape of the mold surface 14 corresponding to the thickness direction thereof, the bottom portions 21y and 21z have the same shape as or similar to the shape of the mold surface 14. can do. Therefore, for example, when machining using an NC machine or the like, the machining data of the mold surface 14 can be used as it is or after being modified.

  Separately from the production of the first mold part 17, the second mold part 18 is formed using a predetermined workpiece that can be formed. In this second mold part, a heat medium supply path 31 and a discharge path 32 are formed, and openings 31 a and 32 a are opened in the second mating surface 20, and a planar second side is formed on one side. A second mold part 18 having a mating surface 20 over substantially the entire surface is produced.

  In the production of the second mold part 18, the thickness of the second mold part 18 can be appropriately selected, and the injection mold 10 can be reduced in size by reducing the thickness within a range where the strength can be secured. Can be planned.

  In addition to the first and second mold parts 17 and 18, the fitting body 25 shown in FIGS. 6A to 6C that can be fitted into the flow path grooves 21 b and 21 d of the first mold part 17. Is made.

  Thereafter, using the first mold part 17 and the second mold part 18 obtained in this way, the fitting body 25 is fitted into the flow path grooves 21b and 21d, and the first mold part 17 of the first mold part 17 is fitted. The first mating surface 19 and the second mating surface 20 of the second mold part 18 are brought into contact with each other, and the mating surface 20 of the second mold part 18 is brought into contact with the back surface 26 a of the flange portion 26 of the fitting body 25. Let them assemble.

  Thereby, the opening side of the channel grooves 21b and 21d is closed, and the heat medium channels 16b and 16d are formed by the fitting body 25 and the inner walls of the channel grooves 21b and 21d. Make it. And if it clamps in the upper division | segmentation die 11 and the division surface 12a which were formed separately, the injection mold 10 provided with the cavity 13 can be manufactured.

  In order to mold the resin by injection molding using the injection mold 10 thus manufactured, the upper split mold 11 and the lower split mold 12 are clamped to form the cavity 13, and the heat medium The mold temperature is raised by causing the heat medium to flow through the flow paths 16a to 16e, the molten resin is injected into the cavity 13 from a gate portion (not shown) of the injection mold 10, and after completion, the heat medium flow paths 16a to 16e. The mold can be molded by lowering the mold temperature by flowing a cooling heat medium through 16e, opening the mold, and taking out the molded product.

  According to the injection molding die 10 and the manufacturing method thereof as described above, since the flow path grooves 21b and 21d are formed from the first mating surface 19 of the first mold part 17, from the back side of the lower split mold 12 Compared with the formation, the processing amount of the flow path grooves 21b and 21d can be reduced. At the same time, since the mating surfaces 19 and 20 of the first and second mold parts 17 and 18 are formed in a planar shape, the mating surfaces 19 and 20 with desired accuracy can be formed without using a special processing machine. It can be easily formed as compared with the case of forming a three-dimensional shape. Therefore, the lower split mold 12 having the heat medium flow paths 21b and 21d can be easily processed, and the injection mold 10 can be easily manufactured.

  Further, since the first mating surface 19 of the first mold part 17 is planar, the mold surface 14 of the first mold part 17 has heat medium flow paths 21b and 21d along the three-dimensional shape surface 14b. Even so, it is easy to ensure the thickness of the entire first mold part 17 and to ensure sufficient strength of the first mold part 17. At the same time, since the mating surfaces 19 and 20 of the first and second mold parts 17 and 18 are planar, it is easy to form with a desired accuracy in a wide range, and the first and second mold parts 17 and 18 are aligned. The surfaces 19 and 20 can be brought into contact with each other in a wide range, and the strength of the lower split mold 12 having the heat medium flow paths 16b and 16d can be easily ensured. Therefore, it is easy to reduce the size and the like with a simple configuration.

  Further, since the distance between the bottom portions 21y and 21z and the three-dimensional shape surface 14b at each position of the flow path grooves 21b and 21d is substantially constant, uniform heat exchange is possible, and injection is performed during resin molding. It is easy to heat or cool the mold surface of the molding die efficiently and more uniformly.

  Further, a fitting body 25 is provided which can be fitted into the channel grooves 21b and 21d to form the heat medium channels 16b and 16d between the inner walls of the channel grooves 21b and 21d. Since the concave and convex shapes are formed so that the cross-sectional areas of the flow paths 16b and 16d are substantially constant at each position, the flow velocity at each position of the heat medium flowing in the heat medium flow paths 16b and 16d can be easily uniformed and the mold efficiently It is easy to heat or cool the surface more uniformly.

  Furthermore, the flow path grooves 21b and 21d are provided with step recesses 23b and 23d and flow path forming recesses 24b and 24d recessed from the step recesses 23b and 23d, and a flange portion in which the fitting body 25 can be fitted into the step recesses 23b and 23d. 26 and the insertion protrusion 27 inserted into the flow path forming recesses 24b and 24d, the fitting body 25 can be easily fitted into a predetermined position in the depth direction of the flow path grooves 21b and 21d. The desired heat medium flow paths 16b and 16d can be easily formed.

  If a resin molded product is molded using such an injection mold 10, flow path grooves 21 b and 21 d along the three-dimensional shape surface 14 b of the mold surface 14 are formed in the first mold part 17. Since the heat medium flow paths 16b and 16d are formed by the flow path grooves 21b and 21d, the heat medium can flow along the three-dimensional shape surface. It is possible to improve the appearance quality of the obtained resin molded product and shorten the molding cycle.

  In the above embodiment, the example in which the step recesses 23b and 23d are provided in the flow path grooves 21b and 21d and the flange portion 26 is provided in the fitting body 25 has been described. As long as it can be held at a predetermined position in the vertical direction, the step concave portions 23b and 23d and the flange portion 26 are provided around the flow path forming concave portions 24b and 24d and the insertion protrusion 27, respectively, but there is no particular limitation. It is also possible to provide only in a part of the periphery. It is also possible to adopt a configuration in which no flange portion is provided. When the fitting body 25 is assembled, it may be fixed to the first mold part 17 and / or the second mold part 18 by bolting, press-fitting, adhesion, welding or the like.

  Furthermore, in the above, the fitting bodies 25 of separate members are fitted into the flow path grooves 21b and 21d of the first mold part 17, but the fitting bodies integrally formed in the plurality of flow path grooves are used. It is also possible to fit. In that case, for example, a plurality of insertion protrusions 27 projecting from the common flange portion 26 are used as fitting bodies, and a plurality of flow paths are formed on the first mating surface 19 of the first mold part 17. It is also possible to provide a recess and provide a step recess so as to be continuous with the recess.

  In the above description, the example in which the heat medium flow paths 16a to 16e are provided only in the lower split mold 12 has been described. However, the heat medium flow paths 16a to 16e can be provided in the upper split mold 11 and can be arbitrarily provided in a plurality of split molds. It is.

  Furthermore, in the above description, the example in which the heat medium flow path is formed inside the split mold having a shape in which the three-dimensional shape surface of the mold surface protrudes is explained. However, even in the split mold having the concave mold surface Similarly to this embodiment, it is possible to form the channel groove with a depth varying along the uneven shape of the three-dimensional shape surface, and the same effect can be obtained.

FIG. 5 is a plan view of the lower split mold showing the state where the upper split mold is removed in the injection mold according to the embodiment of the present invention. It is AA sectional drawing of the injection mold of FIG. 1 of the embodiment. It is BB sectional drawing of the injection mold of FIG. 1 of the embodiment. FIG. 2 is a bottom view of a first mold part of the injection mold of FIG. 1 of the same embodiment. It is CC sectional drawing of FIG. 4 of the embodiment. The fitting body of the injection mold of FIG. 1 of the embodiment is shown, (a) is a front view, (b) is a side view, and (c) is a plan view. It is a top view of the lower division type which shows the state which showed the injection mold which has the conventional heat carrier flow path, and removed the upper division type. The injection mold which has the said same heat carrier flow path is shown, and it is CC sectional drawing of Fig.7 (a). The injection mold which has the said conventional heat carrier flow path is shown, and it is DD sectional drawing of Fig.7 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Injection mold 11 Upper division mold 12 Lower division mold 14, 15 Mold surface 14b, 15b Three-dimensional shape surface 16a-16e Heat-medium flow path 17 1st mold component 18 2nd mold component 19 1st mating surface 20 Second mating surface 21b, 21d Channel groove 21y, 21z Bottom portion 23b, 23d Step recess 24b, 24d Channel formation recess 25 Fitting body 26 Flange portion 27 Insertion protrusion

Claims (6)

In an injection mold having a plurality of divided molds having a mold surface, and having a heat medium flow path in which at least one of the plurality of divided molds allows a heat medium to flow,
The split mold having the heat medium flow path includes a first mold part having the mold surface and a second mold part disposed on the back surface of the first mold part, and the first mold part And the second mold part are formed by abutting planar mating surfaces formed on each,
The mold surface of the first mold part is formed with a three-dimensional shape surface whose distance from the mating surface changes,
On the mating surface side of the first mold part, a channel groove whose depth changes along the uneven shape of the three-dimensional shape surface is formed, and a shape corresponding to the bottom of the channel groove Having a fitting body fitted into the channel groove,
When the fitting body is fitted in the channel groove, the mating surfaces of the first mold part and the second mold part are brought into contact with each other. An injection mold, wherein the heat medium flow path having a substantially constant cross-sectional area at each position is formed between the groove for use.   2. The injection molding metal according to claim 1, wherein the flow path groove is formed such that a distance between a bottom portion at each position of the flow path groove and the three-dimensional shape surface is substantially constant. Type.   The channel groove includes a step recess formed on the opening side and a channel formation recess formed on the mold surface side from the step recess, and the fitting body is accommodated in the step recess. The heat medium flow path is formed between the flow path forming concave portion and the insertion portion, and includes a flange portion to be inserted and an insertion portion to be inserted into the flow path forming concave portion. The injection mold according to 1 or 2. It is a manufacturing method of the injection mold according to any one of claims 1 to 3,
Forming a planar first mating surface on the back side of the mold surface and forming the flow path groove on the first mating surface side to produce the first mold part;
Forming a second mating surface comprising a plane to produce the second mold part;
Producing a fitting body having a shape corresponding to the bottom of the flow channel groove and fitable in the flow channel groove;
The fitting body is fitted into the channel groove, and the first die part, the second die part, and the fitting are brought into contact with the first mating surface and the second mating surface. A step of forming the heat medium flow path having a substantially constant cross-sectional area at each position between the fitting body and the flow path groove by assembling the combined body. Mold manufacturing method.   A molding method comprising molding a resin using the injection mold according to any one of claims 1 to 3.   The molding method according to claim 5, wherein the molten resin is injected into the injection mold and solidified while changing the mold temperature by flowing the heat medium through the heat medium flow path.

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