WO2018159136A1 - 樹脂成形体 - Google Patents

樹脂成形体 Download PDF

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Publication number
WO2018159136A1
WO2018159136A1 PCT/JP2018/001416 JP2018001416W WO2018159136A1 WO 2018159136 A1 WO2018159136 A1 WO 2018159136A1 JP 2018001416 W JP2018001416 W JP 2018001416W WO 2018159136 A1 WO2018159136 A1 WO 2018159136A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
molded body
hole
resin molded
resin
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/001416
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
孝仁 野崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
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
Application filed by Denso Corp filed Critical Denso Corp
Publication of WO2018159136A1 publication Critical patent/WO2018159136A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • 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
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates

Definitions

  • the present disclosure relates to a resin molded body in which a hole is formed in part.
  • a tank portion for storing cooling water is formed of resin for the purpose of weight reduction.
  • a hole for supplying cooling water from the outside is formed in a part of the tank.
  • the inside of the tank is at a high pressure. For this reason, a force that pushes the hole is applied to the inner wall surface of the hole formed in the tank.
  • the tank which is a resin molded body, is often provided with inner pillars, reinforcing ribs, and the like.
  • an inner column (bridge portion) extending in the width direction of the heat exchanger is formed inside the input port through which the refrigerant flows. Yes. With such a configuration, damage to the tank due to the pressure of the refrigerant is prevented.
  • a line called a weld line may remain in a part thereof.
  • the weld line is generated in a portion where the molten resin flowing into the mold from the gate is divided and the divided flows are merged again. For this reason, at the time of molding of a resin molded body in which a hole is formed in part, a weld line is particularly likely to occur in the vicinity of the hole.
  • the strength against tensile stress tends to decrease. For this reason, if a weld line is generated in a part of the tank having an internal high pressure as described above, the tank may be damaged starting from the weld line.
  • the present disclosure is intended to provide a resin molded body capable of suppressing the generation of weld lines while having a configuration in which holes are formed in part.
  • the resin molded body according to the present disclosure is a resin molded body in which a hole is formed in a part thereof, and a gate portion that is a portion where molten resin flows from the gate during molding and inner walls facing each other in the hole. And an inner pillar portion formed so as to connect the two.
  • the inner pillar portion is formed so as to extend along the resin flow direction, which is the direction from the gate portion toward the hole.
  • the inner column portions are connected to the inner wall surfaces facing each other in the hole. For this reason, even if the force which spreads inner wall surfaces is applied, it is prevented by the inner pillar part that a resin molding is damaged.
  • the inner column part is formed so as to extend along the resin flow direction. For this reason, at the time of shaping
  • a resin molded body that can suppress the occurrence of weld lines while having a configuration in which holes are formed in part.
  • FIG. 1 is a diagram illustrating a configuration of a tank that is a resin molded body according to the first embodiment.
  • FIG. 2 is a diagram illustrating the tank of FIG. 1 as viewed from the lower surface side.
  • FIG. 3 is a cross-sectional view showing the configuration of the water injection section in the tank of FIG.
  • FIG. 4 is a cross-sectional view showing the configuration of the water injection section in the tank of FIG.
  • FIG. 5 is a diagram schematically showing the flow of the molten resin during molding.
  • FIG. 6: is sectional drawing which shows the structure of a water injection part among the tanks which are the resin moldings which concern on 2nd Embodiment.
  • FIG. 6 is sectional drawing which shows the structure of a water injection part among the tanks which are the resin moldings which concern on 2nd Embodiment.
  • FIG. 7 is a cross-sectional view illustrating a configuration of a water injection unit in a tank that is a resin molded body according to the second embodiment.
  • FIG. 8 is a cross-sectional view illustrating a configuration of a water injection portion in a tank that is a resin molded body according to the third embodiment.
  • FIG. 9 is a diagram illustrating the inner pillar portion shown in FIG. 8 as viewed from the lower surface side.
  • the resin molded body according to the first embodiment is configured as a tank 10 for a radiator mounted on a vehicle.
  • the shape of the tank 10 will be described with reference to FIGS. 1 and 2.
  • the tank 10 is a container for temporarily storing cooling water supplied to a radiator (the whole is not shown) and supplying the cooling water to a plurality of tubes.
  • the entire tank 10 is formed by resin injection molding.
  • the tank 10 has a main body portion 20, a water injection portion 30, and a cooling water passage portion 40.
  • the main body 20 is a portion that occupies almost the entire tank 10.
  • the main body 20 is configured as a container whose lower side in FIG. 1 (the front side in FIG. 2) is open to the outside.
  • a metal plate (not shown) is caulked and fixed to a portion of the main body 20 that is open as described above (hereinafter also referred to as “opening 22”), and a plurality of tubes are connected to the metal plate.
  • a plurality of reinforcing ribs 21 for increasing the strength are formed on the outer surface of the main body 20.
  • a space SP for storing cooling water is formed inside the main body 20.
  • the portion at the right end of FIG. 1 of the main body 20 is a portion into which molten resin flows from the gate into the mold when the tank 10 is molded by injection molding. .
  • this portion is referred to as a “gate portion GP”.
  • the direction in which the molten resin flows from the gate part GP into the mold is the x direction
  • the x axis is set along the same direction.
  • the direction from the back side to the near side in FIG. 1 is the y direction
  • the y axis is set along the same direction.
  • the direction from the lower side to the upper side in FIG. 1 is the z direction
  • the z axis is set along the same direction.
  • the x axis, the y axis, and the z axis are similarly set.
  • the water injection part 30 is a part formed as an inlet for cooling water when water is poured into the empty radiator from the outside.
  • the water injection part 30 is formed so as to protrude in the z direction from a position that is substantially central in the x direction in the main body part 20.
  • the water injection part 30 is formed with a circular through hole 31 that penetrates along the z direction (see FIG. 2).
  • the external space and the space SP communicate with each other through the through hole 31.
  • the through hole 31 is closed by a lid (not shown).
  • a pressure adjusting pipe 32 is formed on the side surface of the water injection section 30 on the ⁇ x direction side.
  • the pressure adjusting pipe 32 is a circular tube and is formed so as to extend from the side surface of the water injection section 30 toward the ⁇ x direction side.
  • the internal space of the pressure adjustment pipe 32 is connected to the internal space of the water injection unit 30.
  • the pressure adjustment pipe 32 is provided for the purpose of releasing the pressure when the internal pressure of the tank 10 is excessively increased due to an increase in the temperature of the cooling water.
  • a mechanism (such as an on-off valve) (not shown) for adjusting the internal pressure of the tank 10 is connected to the pressure adjustment pipe 32.
  • the cooling water passage portion 40 is a portion formed as an inlet to the tank 10 for cooling water circulating between the internal combustion engine and the radiator.
  • the cooling water passage portion 40 includes a first portion 41 protruding from the main body portion 20 in the y direction, and a second portion 42 protruding from the middle of the first portion 41 substantially in the ⁇ x direction. .
  • An opening 43 is formed at the tip of the second portion 42, and cooling water is supplied to the inside of the tank 10 (space SP) through the opening 43.
  • the cooling water passage portion 40 may be used as an inlet for cooling water to the tank 10 as described above, but may be used as an outlet for cooling water from the tank 10.
  • FIG. 3 shows a cross section when the water injection section 30 is cut along a plane perpendicular to the y-axis.
  • FIG. 4 shows a cross section when the water injection section 30 is cut along a plane perpendicular to the x-axis.
  • an inner pillar portion 60 is provided inside the through hole 31.
  • the inner column part 60 is formed in a flat plate shape and is formed so as to connect the inner wall surfaces facing each other in the through hole 31.
  • the portion S1 of the inner wall surface of the through hole 31 to which one end of the inner column portion 60 is connected is the portion closest to the gate portion GP in top view. Further, the portion S2 of the inner wall surface of the through hole 31 to which the other end of the inner column portion 60 is connected is the portion farthest from the gate portion GP in top view. That is, the inner column portion 60 is formed to extend along the direction from the gate portion GP toward the through hole 31, that is, the direction in which the molten resin flows during molding (hereinafter also referred to as “resin flow direction”). In the present embodiment, the resin flow direction coincides with the x direction.
  • the pressure inside the tank 10 may increase due to an increase in the temperature of the cooling water. For this reason, a force is applied to the inner wall surface of the through hole 31 formed in the tank 10 to push the through hole 31 wide. For this reason, there is a concern that the tank 10 may be damaged by the force.
  • the strength of the tank 10 is improved by the inner pillar portion 60 formed inside the through hole 31, thereby preventing the tank 10 from being damaged.
  • the reinforcing ribs 21 formed on the main body part 20 can be reduced or eliminated.
  • FIG. 5 (A) shows the flow of the molten resin at the time of molding when the inner pillar portion 60 is not formed.
  • the molten resin flowing into the mold from the gate part GP is directed to the through hole 31 while flowing along the x direction.
  • the molten resin that has reached the vicinity of the through hole 31 is divided into two flows along the through hole 31.
  • one of these flows is indicated by an arrow AR1, and the other flow is indicated by an arrow AR2.
  • FIG. 5B shows the flow of the molten resin when the tank 10 according to this embodiment is molded.
  • the molten resin flow (arrow AR3) that has passed through the inner column portion 60 also merges at the location where the molten resin flow indicated by the arrow AR1 and the molten resin flow indicated by the arrow AR2 merge. . That is, the molten resin that has passed through the inner column portion 60 along the resin flow direction along the weld line WL1 with respect to the location where the weld line WL1 has occurred as shown in FIG. Supplied. For this reason, generation
  • weld line WL1 is generated at a location where stress is likely to concentrate in the tank 10 (the apex on the z direction side of the main body 20), whereas the weld lines WL11 and WL12 are generated at locations different from the above. . For this reason, the strength reduction of the tank 10 due to the weld lines WL11 and WL12 is further less likely to occur.
  • the second embodiment will be described with reference to FIGS.
  • the tank 10A according to the present embodiment is different from the first embodiment in the shape of the inner pillar portion 60A formed inside the through hole 31.
  • differences from the first embodiment will be mainly described, and description of points that are common to the first embodiment will be omitted as appropriate.
  • the inner column portion 60A in the present embodiment is not a flat plate but a column.
  • 60 A of inner pillar parts are formed so that the part S1 and the part S2 may be connected among the inner wall surfaces of the through-hole 31 in the state in which the center axis was along the resin flow direction (x direction). Even in such an aspect, the same effects as those described in the first embodiment can be obtained. Moreover, in this embodiment, the effect that it becomes easy for molten resin with a high viscosity to flow in into the inner pillar part 60A because the inner pillar part 60A was made into the column shape.
  • the third embodiment will be described with reference to FIGS.
  • the tank 10B according to the present embodiment is different from the first embodiment in the shape of the inner pillar portion 60B formed inside the through hole 31.
  • differences from the first embodiment will be mainly described, and description of points that are common to the first embodiment will be omitted as appropriate.
  • the inner column portion 60B in the present embodiment has a generally flat plate shape as in the first embodiment. However, as shown in FIG. 8, the dimension (that is, the height) along the z-axis of the inner pillar portion 60B gradually increases toward the x-direction side. In FIG. 8, the dimension on the most ⁇ x direction side is shown as “H1”, and the dimension on the most x direction side is shown as “H2”. H1 is smaller than H2.
  • the dimension (that is, the width) along the y-axis of the inner column portion 60B gradually decreases toward the x-direction side.
  • the dimension on the most ⁇ x direction side is indicated as “W1”
  • the dimension on the most x direction side is indicated as “W2”.
  • W1 is larger than W2.
  • the cross-sectional area when the inner column part 60B is cut along a plane perpendicular to the x-axis is constant regardless of the x coordinate of the cut surface, as in the first and second embodiments. Yes. That is, the inner pillar portion 60B has a shape in which a cross-sectional area in a cross section perpendicular to the resin flow direction (x direction) does not change depending on the position of the cross section. Since the resistance to the flow of the molten resin does not increase locally at a position in the middle of the inner column portion 60B, the molten resin can be passed smoothly during molding.
  • Such a shape of the inner column portion 60B is particularly effective in a case where the height on one end side of the inner column portion 60B has to be lowered due to, for example, restrictions due to the shape of the main body portion 20 or the like.
  • the resin molded body is configured as a tank for a radiator.
  • the configuration of the resin molded body as described above can be applied to other resin products. For example, it can be applied to a part of an intercooler.
  • the hole in which the inner pillar portion is formed may be the through hole 31 as in the present embodiment, but may be a bottomed hole that does not penetrate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
PCT/JP2018/001416 2017-03-03 2018-01-18 樹脂成形体 Ceased WO2018159136A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017040552A JP6717236B2 (ja) 2017-03-03 2017-03-03 樹脂成形体
JP2017-040552 2017-03-03

Publications (1)

Publication Number Publication Date
WO2018159136A1 true WO2018159136A1 (ja) 2018-09-07

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PCT/JP2018/001416 Ceased WO2018159136A1 (ja) 2017-03-03 2018-01-18 樹脂成形体

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Publication number Priority date Publication date Assignee Title
JP7512217B2 (ja) 2021-01-27 2024-07-08 ダイキョーニシカワ株式会社 樹脂製タンク

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01206014A (ja) * 1988-02-13 1989-08-18 Kasai Kogyo Co Ltd クロス一体化射出成形体
JPH07256679A (ja) * 1994-03-24 1995-10-09 Nippon Plast Co Ltd 中空成形品の製造法及びそのための金型
JP2003285351A (ja) * 2002-03-28 2003-10-07 Sekisui Chem Co Ltd 射出成形金型
JP2005096393A (ja) * 2003-08-27 2005-04-14 Mirai Kk 合成樹脂成形品の製造方法、一次成形品及び合成樹脂成形品
JP2012172857A (ja) * 2011-02-17 2012-09-10 T Rad Co Ltd 熱交換器の樹脂製タンク
JP2017048982A (ja) * 2015-09-04 2017-03-09 株式会社デンソー 熱交換器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01206014A (ja) * 1988-02-13 1989-08-18 Kasai Kogyo Co Ltd クロス一体化射出成形体
JPH07256679A (ja) * 1994-03-24 1995-10-09 Nippon Plast Co Ltd 中空成形品の製造法及びそのための金型
JP2003285351A (ja) * 2002-03-28 2003-10-07 Sekisui Chem Co Ltd 射出成形金型
JP2005096393A (ja) * 2003-08-27 2005-04-14 Mirai Kk 合成樹脂成形品の製造方法、一次成形品及び合成樹脂成形品
JP2012172857A (ja) * 2011-02-17 2012-09-10 T Rad Co Ltd 熱交換器の樹脂製タンク
JP2017048982A (ja) * 2015-09-04 2017-03-09 株式会社デンソー 熱交換器

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JP6717236B2 (ja) 2020-07-01
JP2018144318A (ja) 2018-09-20

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