WO2015076013A1 - 樹脂成形品及びその製造方法とそれを実施するための射出成形装置、射出成形金型及び射出成形方法 - Google Patents

樹脂成形品及びその製造方法とそれを実施するための射出成形装置、射出成形金型及び射出成形方法 Download PDF

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Publication number
WO2015076013A1
WO2015076013A1 PCT/JP2014/075179 JP2014075179W WO2015076013A1 WO 2015076013 A1 WO2015076013 A1 WO 2015076013A1 JP 2014075179 W JP2014075179 W JP 2014075179W WO 2015076013 A1 WO2015076013 A1 WO 2015076013A1
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WO
WIPO (PCT)
Prior art keywords
mold
molded product
insert
resin molded
nest
Prior art date
Application number
PCT/JP2014/075179
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
三浦慎吾
林慶樹
井出徹
山田英晴
神志那昇
江藤拓也
森浦智也
山縣二寧
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2013238536A external-priority patent/JP5829255B2/ja
Priority claimed from JP2014151570A external-priority patent/JP5941946B2/ja
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to BR112016010911-2A priority Critical patent/BR112016010911B1/pt
Priority to BR122021021712-2A priority patent/BR122021021712B1/pt
Publication of WO2015076013A1 publication Critical patent/WO2015076013A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2505/00—Use of metals, their alloys or their compounds, as filler
    • B29K2505/02—Aluminium

Definitions

  • the present invention relates to a resin molded product made of a resin material to which metal flakes are added, a manufacturing method thereof, and an injection molding apparatus for carrying out the method. Furthermore, the present invention relates to an injection mold and an injection molding method in which a cavity is formed between one mold having a nest attached thereto and the other mold.
  • a resin molded product exhibiting gloss (brightness) is conventionally produced by applying a paint to which a bright pigment is added to a resin material.
  • a paint to which a bright pigment is added is added to a resin material.
  • the portions (surface layers 3a and 3b) in contact with the molds in the molten resins 1a and 1b are restricted in flow because frictional resistance is generated between the molds 2a and 2b. Accordingly, the flow rate of the molten resin 1a, 1b is small on the surface layer 3a, 3b side contacting the molds 2a, 2b, and is large on the inside 4 side. For this reason, the flow direction front ends of the molten resins 1a and 1b have a curved shape in which the inside 4 side protrudes from the surface layers 3a and 3b side.
  • the surface layers 3a and 3b are hardened in a shorter time than the inside 4 because the heat is taken by the molds 2a and 2b.
  • a so-called skin layer 5 is formed by this curing.
  • the metal flakes 6 added to the molten resins 1a and 1b are thin and long pieces.
  • the majority of the metal flakes 6 have a longitudinal direction in the molten resin. It is oriented along the flow direction of 1a and 1b (so as to be substantially parallel).
  • the metal flakes 6 are oriented along the bending direction of the tips at the tips of the molten resins 1a and 1b in the flow direction. That is, the longitudinal direction is inclined with respect to the flow direction.
  • the orientation of the metal flakes 6 is maintained even after the molten resins 1a and 1b are associated with each other as shown in FIG. 6B. That is, at the meeting location, the metal flakes 6 maintain an inclined posture with respect to the flow direction. Therefore, also in the skin layer 5 in the weld portion, the metal flakes 6 are inclined with respect to the flow direction.
  • the skin layer 5 Since the skin layer 5 is a hardened part, the skin layer 5 hardly flows as the inside 4 flows. Therefore, the posture of the metal flakes 6 included in the skin layer 5 does not change.
  • the inside 4 of the molten resin 1a, 1b is cured, thereby forming a resin molded product as shown in FIG. 6D.
  • this resin molded product in the skin layer 5 of the weld portion, the posture in which the metal flakes 6 are inclined with respect to the flow direction (the directions of arrows A and B), that is, the posture in which the longitudinal direction is directed in the thickness direction is maintained. For this reason, glossiness is not sufficient.
  • the injection mold consists of a fixed mold (hereinafter referred to as “fixed mold”) fixed to the fixed plate of the injection molding machine and a movable mold (hereinafter referred to as movable) fixed to the movable plate of the injection molding machine. Mold).
  • fixed mold fixed to the fixed plate of the injection molding machine
  • movable movable
  • Mold movable mold
  • a cavity having a shape matching the shape of the molded product is formed between the two molds.
  • a molding material such as molten resin
  • the convex mold may be referred to as a cavity and the concave mold may be referred to as a core.
  • the cavity in this specification means a space.
  • Japanese Unexamined Patent Publication No. 2013-82230 shows an injection molding method in which an opening forming body is provided in a cavity of an injection mold to manufacture a molded product having an opening.
  • the molding material is injected into the cavity provided with the opening forming body, it is included in the molding material at the weld line where the molding material flowing clockwise around the opening forming body and the molding material flowing counterclockwise merge.
  • the appearance line deteriorates due to the manifestation of the alignment lines in which the fillers are vertically aligned.
  • the mold is injected into the cavity after heating the fixed mold to the softening point temperature of the molding material, and before the pressure holding step (the molding material is completely filled with the cavity). Deterioration of the appearance is suppressed by injecting the molding material toward the orientation line or by orienting it in the horizontal direction.
  • Japanese Patent Laid-Open No. 2000-238103 is an apparatus that improves the transferability of the uneven shape of the inner surface of the cavity to the molded product by increasing the temperature of the cavity, and improves the productivity by shortening the molding cycle of the molded product.
  • the apparatus to be made is shown.
  • a nest is attached to a fixed mold, a gap is formed between the outer peripheral surface of the nest and the inner peripheral surface of the fixed mold, and the bottom surface side of the nest Is provided with a heat insulating material, and the insert is made of a member having a higher coefficient of linear expansion than other mold members, so that only the vicinity of the cavity can be controlled in temperature efficiently. Further, when the molding is performed, the insert is thermally expanded to close the gap formed around the insert, thereby preventing the occurrence of burrs due to the resin entering the gap.
  • the present invention has been made to solve the above-described problems, and provides a resin molded product having a sufficiently glossy design surface visually recognized by a user, a manufacturing method thereof, and an injection molding apparatus for carrying out the same. Is the first purpose.
  • the present invention has been made in view of such problems, and shortens the molding cycle, and the molding material flows into the gap formed between the outer peripheral surface of the insert and the inner peripheral surface of the mold. It is a second object of the present invention to provide an injection mold and an injection molding method capable of preventing the occurrence of burrs and suppressing the occurrence of stress in the insert.
  • the present invention provides a resin molded article made of a resin material to which long metal flakes are added.
  • the longitudinal direction of the metal flakes is oriented so as to be directed in the direction perpendicular to the thickness direction of the resin molded product on the design surface side, and the resin molded product on the back surface side. It includes a portion oriented so as to go in the thickness direction of the product.
  • the metal flakes exist in a posture in which the longitudinal direction is substantially parallel to the direction orthogonal to the thickness direction (flow direction of the molten resin). To do. That is, the large-area reflective surface of the metal flake is directed to the user side. For this reason, light is efficiently reflected by the metal flakes, and as a result, the user can recognize a sufficient glossiness.
  • the back surface is usually a surface that cannot be visually recognized by the user when using the resin molded product. Therefore, on the back surface side, the metal flakes are oriented so that the longitudinal direction is directed to the thickness direction of the resin molded product. For this reason, there is no problem even if it does not exhibit sufficient gloss.
  • the portion where the orientation of the metal flakes is different between the design surface side and the back surface side is typically a weld portion (a meeting point between molten resins).
  • Concavities and convexities may be formed on the design surface.
  • the orientation of the metal flakes existing on the design surface is random, the user can recognize the glossiness regardless of the viewing angle.
  • a translucent layer may be provided on the design surface. This further improves the gloss feeling. This is particularly noticeable when irregularities are formed on the design surface. This is because surface irregular reflection caused by unevenness is suppressed.
  • the present invention provides a method for producing a resin molded product for obtaining a resin molded product made of a resin material to which long metal flakes are added.
  • the part (surface layer) heated by the heating means is kept in a fluid state. That is, the surface layer on the heated side of the molten resin and the inside can flow even after the molten resins are associated with each other in the cavity.
  • the non-heated part (the back surface of the surface layer) that is not heated is in a highly viscous state having a relatively high viscosity. That is, the molten resin has a viscosity difference along the thickness direction.
  • the molten resin has a viscosity difference along the thickness direction.
  • resistance to flow occurs on the back side having high viscosity.
  • the orientation of the metal flakes included on the surface layer side is easily corrected. That is, reorientation of the metal flakes occurs, and the metal flakes are corrected so that the longitudinal direction is in the direction of flow (substantially parallel).
  • the filling of the molten resin into the cavity is completed.
  • the molten resin can easily flow.
  • Concavities and convexities may be formed on the molten resin at the portion that becomes the design surface of the resin molded product.
  • the orientation of the metal flakes on the design surface becomes random, the user can recognize the glossiness regardless of the viewing angle.
  • a process of providing a light-transmitting layer on the design surface may be further performed, thereby improving the glossiness.
  • the present invention provides an injection molding apparatus for obtaining a resin molded product made of a resin material to which long metal flakes are added.
  • Fixed type A movable mold that is displaced in a direction approaching or separating from the fixed mold; Heating means provided in either the fixed mold or the movable mold; Have A plurality of gates for supplying molten resin to which metal flakes are added are provided in the cavity formed by the fixed mold and the movable mold, A pressure is applied to the molten resin maintained in a flowable state by the heating means after the molten resins are associated with each other in the cavity from each of the plurality of gates.
  • the heating means is preferably provided on the mold on the side on which the design surface of the resin molded product is formed. In this case, a resin molded product that exhibits glossiness over the entire design surface and is excellent in aesthetic appearance is obtained.
  • an uneven shape transferred as the unevenness may be formed on the mold on the side where the design surface is formed.
  • the heating means is provided in the mold of the injection molding apparatus, the molten resin is supplied from each of the plurality of gates, and the molten resins are associated with each other in the cavity, and then heated by the heating means. Pressure is applied to the molten resin while maintaining the state in which the molten resin can flow. For this reason, reorientation occurs in the metal flakes in the molten resin, and the longitudinal direction is corrected to the flow direction (direction orthogonal to the thickness direction).
  • the vast reflecting surface of the metal flake faces the user, the light is efficiently reflected. For this reason, the user can recognize a sufficient glossiness.
  • a cavity is formed between one mold and the other mold to which a nest having a temperature raising mechanism is attached.
  • An injection mold, a gap formed between an outer peripheral surface of the insert and an inner peripheral surface of the one mold, and a driven insert that closes the gap while operating according to thermal expansion of the insert is characterized by providing.
  • the driven insert may be provided between an inflow path of the molding material communicating with the cavity and the gap.
  • the injection mold according to the present invention may be configured such that the driven insert moves to a dividing surface of the one mold and the other mold in accordance with thermal expansion of the insert.
  • the gap may be formed larger than the thermal expansion amount of the insert.
  • the one mold may be a concave mold.
  • the insert may be fixed to the one mold at the center of gravity of the bottom surface attached to the one mold.
  • the driven insert may be formed of a member having a lower thermal conductivity than the insert or the one mold.
  • An injection molding method is an injection molding method in which a molding material is injected into a cavity formed between one mold having a nest and the other mold, and heat is applied to the nest. Forming the gap between the heating step and the outer peripheral surface of the nest thermally expanding by the heating step and the inner peripheral surface of the one mold, and operating the driven nest according to the thermal expansion of the nest And a closing step for closing.
  • the nest in the heating step, the nest may be heated to the melting temperature of the molding material when the mold is opened before the mold is closed.
  • the driven nest that operates according to the thermal expansion of the nest is provided in the gap formed between the outer peripheral surface of the nest and the inner peripheral surface of one mold. ing.
  • the driven nest By operating the driven nest according to the thermal expansion of the nest, the occurrence of stress between the nest and one mold is suppressed, and the durability of the mold is improved. Since the driven insert closes the gap between the insert and one mold when the insert is thermally expanded, it is possible to reliably prevent the molding material from flowing into the gap and generating burrs.
  • the nesting is composed of a member having a higher thermal conductivity than that of one mold and the heat transfer efficiency to the molding material is improved, a gap is formed between the nesting and the one mold. Therefore, the thermal expansion of the nesting is not restricted to one mold. For this reason, it can suppress that a stress arises between a nest
  • the molding material flows into the gap when the molding material flows into the cavity.
  • the molding material when the driven nest moves to the dividing surface of one mold and the other mold in accordance with the thermal expansion of the nest, the molding material is formed when the molding material flows into the cavity. It is possible to efficiently suppress the material from flowing into the gap and becoming a burr.
  • the gap when the gap is formed larger than the thermal expansion amount of the nest, it is possible to prevent stress from being generated due to contact between the nest and one mold during the thermal expansion of the nest. . For this reason, durability of a nest
  • one mold is a concave mold, it is possible to leave the molded product in one mold without leaving the molded product in one mold when the mold is opened. Then, the temperature rise of one mold can be started before the molded product is taken out from the other mold. For this reason, the molding cycle can be further shortened.
  • the insert when the insert is fixed to one mold at the position of the center of gravity of the bottom surface attached to the one mold, the insert is uniformly expanded in the direction of the outer peripheral surface. Is possible. Therefore, it becomes easy to design the gap and the driven insert formed on the outer peripheral surface of the insert.
  • the driven insert when the driven insert is formed of a member having a lower thermal conductivity than the insert or one of the molds, the heat of the insert is transferred to the one mold via the driven insert. Heat transfer to can be suppressed.
  • the molding material in the heating process, if the nest is heated to the melting temperature of the molding material when the mold is opened before the mold is closed, the molding material can be injected into the cavity immediately after the mold is closed.
  • the molding cycle can be shortened.
  • FIG. 6A to FIG. 6D show a flow from the molten resin flowing in the cavity to the formation of the weld portion in the method of manufacturing a resin molded product according to the embodiment of the present invention. It is sectional drawing along the thickness direction of the principal part of the resin molded product in which the unevenness
  • this resin molded product 10 is made of a resin material to which aluminum flakes 12 as metal flakes are added.
  • the molten resin 14 that has flowed from the direction of the arrow X and the molten resin 16 that has flowed from the direction of the arrow Y meet at the weld portion 18.
  • the resin molded product 10 has a horizontal portion 20 that extends substantially horizontally and a skirt portion 22 that continues from the end of the horizontal portion 20 so as to be bent. That is, the resin molded product 10 has a convex shape such that the horizontal portion 20 protrudes.
  • the end surface facing upward in FIG. 1 is the design surface 24, and the end surface facing downward is the back surface 26.
  • the design surface 24 is a surface that is mainly visually recognized when the user is using the resin molded product 10, while the back surface 26 covers, for example, a support that supports the resin molded product 10. In other words, it is a surface that cannot be visually recognized in a normal use state.
  • the aluminum flakes 12 contained in the resin material are long thin pieces and reflect light. By this reflection, the user can recognize the glossiness.
  • the aluminum flakes 12 are oriented so that the longitudinal direction of the aluminum flakes 12 is along the extending direction of the resin material, except for the welds 18. That is, in both the skirt portion 22 and the horizontal portion 20, the aluminum flakes 12 are oriented such that the longitudinal direction is directed to the extending direction of the skirt portion 22 and the extending direction of the horizontal portion 20. After all, the longitudinal direction of the aluminum flakes 12 and the extending direction of the horizontal portion 20 are substantially parallel. For this reason, the aluminum flakes 12 have a posture that is substantially orthogonal to the thickness direction of the resin molded product 10.
  • the aluminum flakes 12 are arranged so that the longitudinal direction is substantially parallel to the thickness direction, in other words, in the thickness direction. Oriented. That is, the longitudinal direction of the aluminum flake 12 is oriented in a direction substantially orthogonal to the extending direction of the horizontal portion 20.
  • the longitudinal direction of the aluminum flakes 12 is substantially parallel to the extending direction of the horizontal portion 20, that is, in a direction substantially orthogonal to the thickness direction.
  • the resin molded product 10 has a portion where the posture of the aluminum flake 12 is different between the design surface 24 side and the back surface 26 side when cut out along the thickness direction.
  • the part is the weld portion 18.
  • the longitudinal direction of the aluminum flakes 12 is directed in a direction orthogonal to the thickness direction of the resin molded product 10 regardless of whether or not the weld portion 18.
  • the orientation is as follows. That is, the reflecting surface extends along the longitudinal direction of the resin molded product 10. For this reason, since the light is efficiently reflected by the aluminum flakes 12, the user can recognize the glossiness.
  • the aluminum flakes 12 are oriented so that the longitudinal direction is in the thickness direction of the resin molded product 10.
  • the entire back surface 26 side is normally visible to the user. There is no aspect. For this reason, even if sufficient glossiness cannot be obtained on the back surface 26 side of the weld portion 18, there is no problem.
  • FIG. 3 is a schematic vertical sectional view of a main part of the injection molding apparatus 30 according to the present embodiment.
  • the injection molding apparatus 30 has a concave mold 32 as a fixed mold and a convex mold 34 as a movable mold.
  • the concave mold 32 is a mold that is provided on the fixed platen 36 that is positioned and fixed at the work station, and has a concave portion 38 that is recessed from the convex mold 34 side to the fixed platen 36 side.
  • the recess 38 is provided with a vertical wall 40 for forming the horizontal portion 20 and an inclined wall 42 for forming the skirt portion 22. That is, a portion that becomes the design surface 24 faces the recess 38.
  • first heaters 44 heating means
  • relatively short second heaters 46 heating means
  • the first heater 44 is disposed so as to extend in parallel to the vertical wall 40, and the second heater 46 extends in a direction orthogonal to the first heater 44 and is close to the inclined wall 42.
  • One convex mold 34 is provided on the movable platen 48.
  • the movable platen 48 is displaced in a direction approaching or separating from the concave mold 32 under the action of a displacement mechanism (for example, a hydraulic cylinder or the like) not shown. Following this, the convex die 34 is also displaced in the same direction.
  • a displacement mechanism for example, a hydraulic cylinder or the like
  • the convex mold 34 has a convex portion 50 protruding toward the concave portion 38.
  • the convex mold 34 approaches and approaches the concave mold 32 and the so-called mold closing is performed, the convex section 50 enters the concave section 38. Thereby, the cavity 52 is formed.
  • the convex mold 34 is provided with a plurality of injection machines (not shown).
  • the molten resins 14 and 16 injected from the respective injection machines are supplied to the cavity 52 through a plurality of gates including the gates 56a and 56b through the runners and sprues 54a and 54b (not shown).
  • the manufacturing method of the resin molded product 10 according to the present embodiment is basically performed by the injection molding apparatus 30 configured as described above as follows.
  • the convex mold 34 is brought close to the concave mold 32 under the action of the displacement mechanism provided on the movable platen 48. As a result, the mold is closed, and the cavity 52 is formed by the concave portion 38 and the convex portion 50.
  • molten resins 14 and 16 to which aluminum flakes 12 have been added in advance are injected from each of the plurality of injection machines.
  • the molten resins 14 and 16 pass through the runner, the sprues 54a and 54b, and the plurality of gates (including the gates 56a and 56b) in this order, and are introduced into the cavity 52.
  • the molten resin 14 injected from the lower injection machine in FIG. 3 flows from the lower side to the upper side, that is, in the direction of the arrow X, while the molten resin injected from the upper injection machine is injected.
  • the resin 16 flows from the top to the bottom, that is, in the direction of the arrow Y.
  • the first heater 44 and the second heater 46 Prior to the molten resins 14 and 16 being introduced into the cavity 52, the first heater 44 and the second heater 46 are energized. For this reason, in the molten resins 14 and 16, the temperature rises at a portion in the vicinity of the vertical wall 40 and the inclined wall 42 of the concave mold 32, and curing is difficult to occur. That is, the flowable state is maintained at the part.
  • the flow rate of the molten resins 14 and 16 are small on the surface layer side in contact with the convex mold 34 or the concave mold 32 and large on the inner side. For this reason, the flow direction front ends of the molten resins 14 and 16 have a curved shape in which the inner side protrudes from the surface layer side. Since the aluminum flakes 12 are oriented along the bending direction of the tips at the tips of the molten resins 14 and 16 in the flow direction, the longitudinal direction of the aluminum flakes 12 is inclined with respect to the flow direction.
  • the design surface 24 side of the weld portion 18 is uncured. This is because the surface layer portion of the molten resins 14 and 16 facing the concave mold 32 is heated by the first heater 44 and the second heater 46 as described above. On the other hand, on the back surface 26 side of the weld portion 18, the heat is taken away by the convex mold 34, so that the curing proceeds in a shorter time than other portions. That is, the skin layer 58 is formed.
  • the cavity 52 is filled with the molten resins 14 and 16 (in other words, after the molten resins 14 and 16 are filled in the cavity 52), for example, in FIG.
  • pressure is applied to the molten resin 14, 16 from one of the plurality of gates.
  • the application of pressure is preferably performed through a gate closest to the weld portion 18. This is because the pressure is propagated to the weld portion 18 in this case.
  • molten resin may be injected from the injection machine.
  • the pressure applying step can be performed also as a so-called pressure holding step of injecting an amount of the molten resin corresponding to the shrinkage amount accompanying the curing of the molten resins 14 and 16 in the cavity 52.
  • pressure may be applied to the molten resins 14 and 16 by inserting pins into the gate.
  • the molten resin 14 and 16 in the cavity 52 can also be pressed by providing a pressing pin in the concave mold 32 or the convex mold 34 and operating the pressing pin.
  • the posture of the aluminum flake 12 included in the surface layer on the concave portion 38 side and inside is corrected so that the longitudinal direction is directed to the flow direction.
  • the longitudinal direction of the aluminum flakes 12 can be made to substantially coincide with the surface direction of the design surface 24 on the design surface 24 side of the weld portion 18.
  • the skin layer 58 is formed on the back surface 26 side of the weld portion 18, almost no flow occurs when pressure is applied from the gate. For this reason, the posture of the aluminum flakes 12 is not corrected. Therefore, the aluminum flakes 12 maintain a posture in which the longitudinal direction is inclined with respect to the flow direction.
  • the resin molded product 10 exhibiting sufficient gloss can be obtained regardless of whether or not the weld portion 18 is obtained through the above-described process.
  • the movable platen 48 and the convex mold 34 are displaced in a direction away from the concave mold 32 under the action of the displacement mechanism, thereby performing mold opening.
  • the resin molded product 10 is pushed out by an eject pin (not shown) and released from the convex mold 34 or the concave mold 32.
  • FIG. 5 you may make it form the unevenness
  • FIG. 5 the orientation of the aluminum flakes 12 existing on the design surface 24 is random. That is, the longitudinal direction rises from the right in the longitudinal direction to the left in the longitudinal direction along the undulations of the projections and depressions 60, the descending from the right in the longitudinal direction to the left in the longitudinal direction, or substantially parallel to the longitudinal direction. Things are mixed. For this reason, the user can recognize glossiness regardless of the viewing angle.
  • the pitch of the projections and depressions 60 (the separation distance between the tops of adjacent projections) be greater than this.
  • the irregularities (transfer shape) for transferring the irregularities 60 may be formed on the vertical wall 40 and the inclined wall 42 of the concave mold 32 (see FIG. 3). With this configuration, when the molten resins 14 and 16 are cured to form the resin molded product 10, the irregularities of the concave mold 32 are transferred to the design surface 24.
  • the unevenness 60 is preferably provided as a constant shape having a regular wave shape with a constant amplitude, wavelength and the like.
  • the number of those having the inclination angle of 60 ° is substantially equal to the number of those having the inclination angle of 40 °. That is, the numbers of aluminum flakes 12 having different inclination angles are substantially equal. For this reason, substantially the same glossiness can be recognized even if the viewing angles are different.
  • a light transmissive layer 62 covering the design surface 24 may be provided (see FIG. 5).
  • a light transmissive layer 62 covering the design surface 24 may be provided (see FIG. 5).
  • the translucent layer 62 can be easily formed by a known method such as applying clear paint and drying.
  • FIG. 5 illustrates the case where the light-transmitting layer 62 is provided on the design surface 24 on which the unevenness 60 is formed. However, the light-transmitting layer 62 is provided on the design surface 24 on which the unevenness 60 is not formed. Of course, it may be.
  • the present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
  • FIG. 3 illustrates the case where the design surface 24 is formed on the concave mold 32 side, but the design surface 24 may be formed on the convex mold 34 side depending on the use and shape of the resin molded product 10. obtain.
  • an injection molding apparatus 30 in which heating means such as the first heater 44 and the second heater 46 are embedded in the convex mold 34 may be used.
  • the heating means is not particularly limited to the first heater 44 and the second heater 46.
  • a flow pipe may be embedded in a mold on the side where the design surface is molded, and heating may be performed by flowing heated oil through the flow pipe.
  • FIG. 7 is a cross-sectional view of the injection mold 102 according to the first embodiment.
  • the injection mold 102 is composed of a fixed mold 104, a nesting 106 and a movable mold 108 constituting a mold body, and a fixed plate of a fixed mold 104 and an injection molding machine (not shown, the same applies hereinafter) as main components. Between the movable mold 108 and the movable side mounting plate 112, between the movable mold 108 and the movable side mounting plate 112, between the movable mold 108 and the movable platen of the injection molding machine.
  • a spacer block 116 that forms a space 114 interposed therebetween, an upper plate 118 and a lower plate 120 provided in the space 114, an ejector pin 122 that is attached to the upper plate 118 and inserted into the movable mold 108,
  • a cavity 124 is formed between the insert 106 and the movable mold 108, and a gap 126 is formed between the outer peripheral surface 106 c of the insert 106 and the inner peripheral surface 130 b of the fixed mold 104.
  • the injection mold 102 has a driven insert 128 that closes the gap 126 while operating according to the operation of the insert 106 between the insert 106 and the fixed mold 104.
  • a split surface (referred to as a partition line or a parting line) PL is formed at the joint between the fixed mold 104 and the movable mold 108.
  • the fixed mold 104 is a concave mold, and is fixed to the stationary platen of the injection molding machine by the fixed side mounting plate 110.
  • the fixed mold 104 has a pocket portion 130 that is pocketed on the partition line PL side, a guide pin bush 132 that opens on the partition line PL side, and a gate 134 and a sprue 136 that communicate with the nozzle of the injection molding machine.
  • the pocket portion 130 is a portion to which the insert 106 is attached, and supports the insert 106 at the bottom portion 130a.
  • the guide pin bush 132 prevents the displacement of the fixed mold 104 and the movable mold 108 by inserting the guide pin 146 on the movable mold 108 side when the fixed mold 104 and the movable mold 108 are closed. .
  • the insert 106 is a component having a recess 106 a that forms a cavity 124.
  • the shape of the concave portion 106a matches the shape of the convex portion of the molded product. Since the nest 106 is formed of a material having high thermal conductivity such as a copper alloy, the entire nest 106 can be heated or lowered in a short time.
  • the bottom surface 106 b side of the insert 106 is detachably attached to the bottom portion 130 a of the pocket portion 130 of the fixed mold 104.
  • a plurality of cooling flow paths 138 for circulating a cooling fluid are formed inside the nest 106, and a plurality of heating flow paths 140 for circulating a heating fluid are formed.
  • the cooling flow path 138 is connected to a cooling device (not shown) that circulates a cooling fluid (cooling oil here), and forms a part of the temperature lowering mechanism.
  • cooling oil circulates between the cooling device and the cooling flow path 138.
  • the heating flow path 140 is connected to a heating device (not shown) that circulates a heating fluid (heating oil in this case), and forms a part of the temperature raising mechanism.
  • the heating oil circulates between the heating device and the heating flow path 140.
  • the cooling flow path 138 and the heating flow path 140 are each arrange
  • a gap 126 is formed between the outer peripheral surface 106 c of the insert 106 and the inner peripheral surface 130 b of the pocket portion 130 of the fixed mold 104. .
  • the volume of the gap 126 when the nest 106 is not thermally expanded is larger than the amount of thermal expansion of the nest 106 (the volume of the nest 106 increased due to thermal expansion).
  • the volume of the pocket portion 130 formed in the fixed mold 104 is made larger than the volume of the insert 106 thermally expanded at the melting temperature of the molding material. For this reason, the gap 126 is maintained even if the insert 106 is thermally expanded.
  • the gap 126 functions as a heat insulating layer.
  • the movable mold 108 is a convex mold, and is fixed to the movable platen of the injection molding machine by the movable side mounting plate 112.
  • the movable mold 108 has a convex portion 108 a that forms a cavity 124.
  • the shape of the convex portion 108a matches the shape of the concave portion of the molded product.
  • the movable mold 108 has a guide pin 146 on the partition line PL side. The guide pin 146 is inserted into the guide pin bush 132 on the fixed mold 104 side when the mold is closed, thereby preventing the positional deviation between the fixed mold 104 and the movable mold 108.
  • the movable mold 108 has a groove-like runner 142 on the surface of the partition line PL of the movable mold 108 and facing the portion from the sprue 136 of the fixed mold 104 to the recess 106a of the insert 106. .
  • the lower plate 120 is attached to the movable side attachment plate 112.
  • the upper plate 118 is movably supported by the lower plate 120 and operates toward the movable mold 108 in accordance with the operation of a driving mechanism (not shown).
  • the ejector pin 122 is inserted into the movable mold 108 and has an end attached to the upper plate 118. As the upper plate 118 moves toward the movable mold 108, the ejector pin 122 protrudes from the convex portion 108a of the movable mold 108 and pushes out the molded product.
  • a cavity 124 is formed between the concave portion 106a of the insert 106 and the convex portion 108a of the movable mold 108.
  • an inflow path of a molding material including a gate 134, a sprue 136, and a runner 142 is formed between a nozzle of an injection molding machine (not shown) and the cavity 124.
  • FIG. 8 is an enlarged cross-sectional view of the driven nest 128 and its peripheral portion.
  • an inclined surface 106d is formed on the partition line PL side.
  • an inclined surface 130 c is formed on the partition line PL side of the inner peripheral surface 130 b of the pocket portion 130 of the fixed mold 104.
  • a stepped portion 130 d is formed on the inner peripheral surface 130 b of the pocket portion 130 of the fixed mold 104.
  • the driven nest 128 is a tapered part and is formed of a material having low thermal conductivity such as stainless steel. Furthermore, the thermal conductivity of the driven nest 128 is lower than the thermal conductivity of the nest 106 or the fixed mold 104.
  • One tapered surface 128a of the driven nest 128 is slidably in contact with the inclined surface 106d of the nest 106.
  • the other tapered surface 128 b of the driven nest 128 is slidably in contact with the inclined surface 130 c of the fixed mold 104.
  • the tapered end portion 128 c of the driven nest 128 is connected to the step portion 130 d of the fixed mold 104 via a spring 144.
  • the end 128d of the follower insert 128 on the fat side faces the runner 142 of the movable mold 108.
  • the driven nest 128 is interposed between the gap 126 and the runner 142 to close the gap 126 with respect to the runner 142.
  • the driven nest 128 When the nest 106 is heated and thermally expanded, the driven nest 128 operates as follows. With the thermal expansion of the insert 106, the inclined surface 106d of the insert 106 moves in the direction toward the inclined surface 130c of the fixed mold 104. Then, the tapered surface 128 a of the driven nest 128 is pressed by the inclined surface 106 d of the nest 106. This pressing force can be decomposed into a force A acting on the runner 142 side and a force B acting on the inclined surface 130c side of the fixed mold 104. The driven nest 128 operates on the runner 142 side while extending the spring 144 by the force A acting on the runner 142 side.
  • the driven nest 128 slides the tapered surface 128a with respect to the inclined surface 106d of the insert 106, and also slides the tapered surface 128b with respect to the inclined surface 130c of the fixed mold 104, To work.
  • the driven nest 128 is always interposed between the gap 126 and the runner 142 even when the nest 106 is thermally expanded, and closes the gap 126 with respect to the runner 142.
  • the driven nest 128 operates as follows. As the insert 106 contracts, the inclined surface 106d of the insert 106 operates in the direction opposite to the inclined surface 130c side of the fixed mold 104. Then, the driven nest 128 is moved toward the spring 144 by the restoring force of the spring 144. At this time, the driven insert 128 slides the taper surface 128a with respect to the inclined surface 106d of the insert 106, and also slides the taper surface 128b with respect to the inclined surface 130c of the fixed mold 104, and the spring 144 side. To work. In this way, the driven nest 128 is always interposed between the gap 126 and the runner 142 even when the nest 106 is contracted, and closes the gap 126 with respect to the runner 142.
  • the taper angles of the tapered surfaces 128a and 128b of the driven insert 128 and the inclination angles of the inclined surface 106d of the insert 106 and the inclined surface 130c of the fixed mold 104 can be arbitrarily set. However, if each angle and the position of the driven nest 128 are designed so that the end 128d of the driven nest 128 coincides with the partition line PL when the nest 106 is thermally expanded, there is an advantage that the molding material is not wasted. Since it is obtained, it is preferable. Specifically, the amount of thermal expansion of the insert 106 at the melting temperature of the molding material may be calculated, and the amount by which the inclined surface 106d of the insert 106 moves toward the inclined surface 130c side of the fixed mold 104 may be calculated.
  • the amount of movement of the inclined surface 106d of the nest 106 is known, the amount of movement of the driven nest 128 for each taper angle can be calculated. Therefore, by adjusting the position and taper angle of the driven nest 128 to the optimum values, the end portion 128d of the driven nest 128 can be aligned with the partition line PL when the nest 106 is thermally expanded.
  • FIG. 9 is a flowchart showing the procedure of the injection molding method according to the first embodiment.
  • FIG. 10 is a time chart showing the temperature transition of the insert 106 during injection molding.
  • heating oil at a predetermined temperature T2 ( ⁇ melting temperature of the molding material) is supplied to the heating channel 140 of the nest 106 to heat the nest 106 (step S1).
  • T2 melting temperature of the molding material
  • the temperature of the heating oil is about 220 ° C.
  • T1 the time when the nest 106 starts to be heated
  • T1 The temperature T of the nesting 106 at the time point t0.
  • step S2 When the supply of the heating oil to the heating flow path 140 is continued, the temperature T of the nest 106 rises and the nest 106 thermally expands after time t0 in FIG.
  • the inclined surface 106d of the nest 106 presses the tapered surface 128a of the driven nest 128 as shown in FIG. Then, the driven insert 128 slides one tapered surface 128a on the inclined surface 106d of the insert 106, and slides the other tapered surface 128b on the inclined surface 130c of the fixed mold 104 while moving it toward the runner 142 side. Operates (step S2).
  • Step S3 NO.
  • the driven insert 128 always contacts the inclined surface 106d of the insert 106 and the inclined surface 130c of the fixed mold 104 and closes the gap 126 during the operation toward the runner 142 side.
  • step S4 When the temperature T of the insert 106 reaches the predetermined temperature T2 (step S3: YES), the fixed mold 104 and the movable mold 108 are closed (step S4).
  • the mold closing timing may be, for example, when the temperature T of the nest 106 is detected by a temperature sensor or the like and the detected value becomes close to the predetermined temperature T2 of the heating oil, or the nest 106 as shown in FIG. If the temperature transition is known, it may be when a predetermined time has elapsed since the supply of the heating oil was started.
  • step S4 After mold closing in step S4, the molten molding material is injected from the nozzle of the injection molding machine into the cavity 124 through the gate 134, the sprue 136, and the runner 142 (step S5).
  • step S5 after the molding material is injected and filled in the cavity 124, the molding material in the cavity 124 is pressurized and compressed to control the orientation of the molding material (step S6).
  • Step S6 the supply of heating oil to the heating flow path 140 of the nest 106 is stopped, and then cooling oil having a predetermined temperature T1 or less is supplied to the cooling flow path 138 of the nest 106 to cool the nest 106.
  • Step S7 the time when the supply of the cooling oil is started is shown as t2.
  • the temperature T of the nesting 106 at the time point t2 is T2.
  • the temperature T of the nest 106 begins to drop.
  • the temperature T of the nest 106 decreases and the nest 106 contracts as shown after time t2 in FIG.
  • the insert 106 contracts the inclined surface 106d of the insert 106 moves in a direction away from the inclined surface 130c of the fixed mold 104.
  • the driven insert 128 restores the spring 144 while sliding one tapered surface 128 a on the inclined surface 106 d of the insert 106 and sliding the other tapered surface 128 b on the inclined surface 130 c of the fixed mold 104. It moves to the spring 144 side by the force (step S8).
  • the driven nest 128 continues to operate toward the spring 144 until the temperature T of the nest 106 reaches the predetermined temperature T1 (step S1). S9: NO).
  • the driven insert 128 always contacts the inclined surface 106d of the insert 106 and the inclined surface 130c of the fixed mold 104 to close the gap 126.
  • the mold opening timing may be, for example, when the temperature T of the nest 106 is detected by a temperature sensor or the like and the detected value becomes close to the predetermined temperature T1, as shown in FIG. If the temperature transition of the insert 106 is known, it may be when a predetermined time has elapsed since the supply of the cooling oil was started.
  • step S10 After the mold opening in step S10, when the upper plate 118 shown in FIG. 7 is moved to the movable mold 108 side, the ejector pin 122 protrudes from the convex portion 108a of the movable mold 108 and pushes the solidified molded product. In this way, the molded product is taken out from the convex portion 108a of the movable mold 108 (step S11).
  • step S12 NO
  • the process returns to step S1 almost simultaneously with step S11, and the predetermined temperature T2 ( ⁇ the molding material of the molding material) is placed in the heating channel 140 of the insert 106. Start supplying heated oil at the melting temperature. And the process after step S1 is repeated.
  • step S12 YES
  • the process is terminated after the molded product is taken out in step S11.
  • the volume of the gap 126 when the nest 106 is not thermally expanded is larger than the amount of thermal expansion of the nest 106 (the volume of the nest 106 increased due to thermal expansion). For this reason, the gap 126 is maintained even if the insert 106 is thermally expanded. That is, even if the nest 106 is thermally expanded, the outer peripheral surface 106 c of the nest 106 is not in contact with the inner peripheral surface 130 b of the pocket portion 130 of the fixed mold 104, and no stress is generated on the nest 106. Accordingly, the insert 106 is not cracked due to stress.
  • the gap 126 functions as a heat insulating layer, heat conduction from the insert 106 to the fixed mold 104 is suppressed. That is, the heat of the insert 106 is not taken away by the fixed mold 104. For this reason, the temperature of the nest
  • the gap 126 functions as a heat insulating layer, heat conduction from the insert 106 to the fixed mold 104 is suppressed. That is, the fixed mold 104 does not take heat of the insert 106 and does not thermally expand. Therefore, even if the mold is closed after raising the temperature of the insert 106 while the mold is open, no galling occurs between the guide pin bush 132 of the fixed mold 104 and the guide pin 146 of the movable mold 108. Therefore, it is possible to raise the temperature of the insert 106 while the mold is open. If the mold is closed and the temperature of the insert 106 is raised as in the prior art, the temperature of the insert 106 is taken by the movable mold 108.
  • the temperature of the nest 106 is not lost to the movable mold 108. Also in this respect, the temperature of the insert 106 can be quickly increased, and the molding cycle can be shortened.
  • the driven nest 128 is disposed between the runner 142 and the gap 126, and always closes the gap 126. For this reason, when filling the cavity 124 with the molding material, the molding material does not flow into the gap 126 from the runner 142. Accordingly, the molding material can be prevented from flowing into the gap 126 and becoming a burr.
  • the end portion 128d of the driven nest 128 moves to a position that coincides with the partition line PL when the nest 106 is thermally expanded. For this reason, generation
  • the driven nest 128 is made of a material having a lower thermal conductivity than the nest 106 or the fixed mold 104. For this reason, conduction of heat of the insert 106 to the fixed mold 104 through the driven insert 128 is suppressed.
  • the insert 106 is made of a material having high thermal conductivity. For this reason, the temperature of the nest
  • FIG. 11 is a cross-sectional view of the fixed mold 152 according to the second embodiment.
  • FIG. 12 is a bottom view of the fixed mold 152 according to the second embodiment.
  • the insert 154 has a knock pin 164 and a plurality of positioning blocks 166 on the bottom surface 154b.
  • the knock pin 164 is formed at the center of gravity of the bottom surface 154b of the insert 154.
  • Each positioning block 166 is arranged so that the radial direction about the knock pin 164 is the longitudinal direction.
  • the fixed mold 152 has a pin hole 160 and a plurality of guide holes 162 penetrating from the bottom portion 156 a to the bottom surface 158 of the pocket portion 156 at positions facing the knock pins 164 and the plurality of positioning blocks 166 of the insert 154.
  • the width W1 of the guide hole 162 of the fixed mold 152 is substantially the same as the width W2 of the positioning block 166 of the insert 154.
  • the length L1 of the guide hole 162 of the fixed mold 152 is longer than the length L2 of the positioning block 166 of the insert 154, and a gap is formed at both longitudinal ends of the guide hole 162 and the positioning block 166. .
  • the knock pin 164 of the insert 154 is inserted into the pin hole 160 of the fixed mold 152, and the plurality of positioning blocks 166 of the insert 154 are inserted into the plurality of guide holes 162 of the fixed mold 152, respectively. It is fixed to the fixed mold 152.
  • the insert 154 when the insert 154 is heated, the insert 154 thermally expands around the knock pin 164 as a base point. At this time, the positioning block 166 is guided by the guide hole 162 so as to operate in the radial direction around the knock pin 164. Therefore, the direction of thermal expansion of the insert 154 is restricted to the longitudinal direction of each guide hole 162.
  • the insert 154 is fixed to one mold, that is, the fixed mold 152 at the position of the center of gravity of the bottom surface 154b attached to one mold, that is, the fixed mold 152. For this reason, it becomes possible to expand the nest
  • the guide hole 162 regulates the expansion direction of the insert 154. For this reason, it becomes easier to design the fixed mold 152, the insert 154, and the driven insert 128.
  • FIG. 13 is a cross-sectional view of the fixed mold 104 according to the third embodiment.
  • the third embodiment is different from the first embodiment in that a heat insulating plate 172 is provided between the fixed mold 104 and the insert 106.
  • the driven nest 128 has the tapered surfaces 128a and 128b.
  • the driven nest 128 may have only one of the tapered surfaces (referred to as an inclined surface in this case).
  • the nesting 106 and the driven nesting 128 are provided in the fixed mold 104 which is a concave shape, but the application of the present invention is not limited to unevenness and fixed / movable.
  • the present invention can be applied to a mold having a nested structure.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
PCT/JP2014/075179 2013-11-19 2014-09-24 樹脂成形品及びその製造方法とそれを実施するための射出成形装置、射出成形金型及び射出成形方法 WO2015076013A1 (ja)

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BR112016010911-2A BR112016010911B1 (pt) 2013-11-19 2014-09-24 Molde de resina, método de fabricação para o mesmo e aparelho de moldagem por injeção para implantar o mesmo
BR122021021712-2A BR122021021712B1 (pt) 2013-11-19 2014-09-24 Matriz de moldagem por injeção e método de moldagem por injeção

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JP2013-238536 2013-11-19
JP2013238536A JP5829255B2 (ja) 2013-11-19 2013-11-19 樹脂成形品及びその製造方法と、それを実施するための射出成形装置
JP2014-151570 2014-07-25
JP2014151570A JP5941946B2 (ja) 2014-07-25 2014-07-25 射出成形金型及び射出成形方法

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WO2018142847A1 (ja) * 2017-01-31 2018-08-09 本田技研工業株式会社 樹脂成形品
FR3067642A1 (fr) * 2017-06-16 2018-12-21 Cera Aps Procede de realisation d’un ecran destine a recouvrir un element interieur de vehicule automobile
CN110248793A (zh) * 2017-01-27 2019-09-17 本田技研工业株式会社 成型用模具
CN110561690A (zh) * 2019-08-22 2019-12-13 珠海格力精密模具有限公司 一种消除塑料模具热膨胀间隙的方法、结构及设备
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CN110561690A (zh) * 2019-08-22 2019-12-13 珠海格力精密模具有限公司 一种消除塑料模具热膨胀间隙的方法、结构及设备
CN114502350A (zh) * 2019-10-10 2022-05-13 昭和电工材料株式会社 注射成型品
CN114502350B (zh) * 2019-10-10 2022-08-02 昭和电工材料株式会社 注射成型品

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