WO2006027979A1 - 発泡成形用の金型及び発泡成形方法 - Google Patents
発泡成形用の金型及び発泡成形方法 Download PDFInfo
- Publication number
- WO2006027979A1 WO2006027979A1 PCT/JP2005/015877 JP2005015877W WO2006027979A1 WO 2006027979 A1 WO2006027979 A1 WO 2006027979A1 JP 2005015877 W JP2005015877 W JP 2005015877W WO 2006027979 A1 WO2006027979 A1 WO 2006027979A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mold
- foam molding
- molded product
- cavity
- air
- Prior art date
Links
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
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/46—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles using fluid pressure
-
- 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
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
Definitions
- the present invention relates to a mold for producing a foam molded product such as urethane foam, and more particularly to a mold capable of efficiently demolding a molded product.
- the present invention also relates to a foam molding method using this mold.
- a urethane raw material liquid is supplied into the lower mold of the upper mold and the lower mold, the mold is clamped and foamed, and after solidification (curing), the mold is opened and removed. Do the type.
- a mold for foam molding In order to perform this demolding, a mold for foam molding is used in which an ejector pin is provided on the lower mold and the molded product is pushed up by this ejector pin. Is easy to attach.
- Japanese Patent Application Laid-Open No. 9-234748 discloses a method in which a film is arranged along the cavity surface of the lower mold and the mold is removed after the mold is opened. Therefore, a foam molding method is described in which air is supplied between the film and the cavity surface to separate the film from the cavity surface force, and the molded product is pushed out of the lower mold by the film.
- FIGs. 6a, 6b, and 6c are cross-sectional views showing the method of the same publication and a mold therefor.
- This mold (mold) consists of an upper mold 2 and a lower mold 3, and these upper and lower molds 2, 3 are joined in a separable manner.
- the lower mold 3 is provided with a cavity 4.
- the lower mold 3 is provided with a polypropylene film 6 that has been previously formed into a shape similar to or identical to the cavity 4 by a vacuum forming method.
- the film 6 is fixed to the upper end surface of the lower mold 3 by a fixing pin 7 and is sandwiched between the film air seal packing 9 disposed on the upper end surface of the lower mold 3 and the film presser 8 to be firmly attached to the lower mold. It is fixed.
- a box-shaped air chamber 10 is provided at the bottom of the lower mold 3, and one end of an air pipe 12 provided with a pressure adjusting valve 11 is connected to the air chamber 10, and the air The other end of tube 12 Is connected to an air introduction / suction device 13 such as a vacuum pump.
- the air chamber 10 and the lower cavity 4 are communicated by a plurality of air communication holes (air holes) 14.
- a predetermined amount of a rigid polyurethane foam foam raw material is introduced onto the vacuum-formed polypropylene film 6 in the cavity 4, and the upper mold 2 is lowered. Clamp to mold 3.
- the upper mold is opened, and as shown in Fig. 6b, the air introduction / suction device 13 is activated, and the air pipe 12, air chamber 10, and air Air is blown into the gap 15 between the film 6 and the cavity 4 through the communication hole 14, the molded product 16 is pushed up together with the film 6, and the molded product 16 is taken out.
- a gas blowing means comprising a valve box and a valve body disposed in the valve box so as to be movable in the vertical direction is provided with a bottom surface of a lower mold.
- a gas blowing means comprising a valve box and a valve body disposed in the valve box so as to be movable in the vertical direction is provided with a bottom surface of a lower mold.
- FIGS. 7a and 7b are cross-sectional views illustrating this method and a mold for this method. 8a
- 8b is a sectional view showing the gas blowing means.
- the mold 20 includes an upper mold 21 and a lower mold 22.
- the lower mold 22 is provided with a cavity 24.
- a gas blowing means 23 is provided on the bottom surface of the lower mold 22.
- the gas blowing means 23 includes a valve box 25 attached to the opening on the bottom surface of the lower mold 22, a valve body 26 disposed in the valve box 25 so as to be vertically movable, and one end of the valve box 25. And an air tube 25a connected to the lower end and connected to the air cylinder at the other end.
- This valve body 26 is a mushroom valve with an inverted taper at the top, and the top surface is flat.
- a flange 26 a is provided at the lower end of the valve body 26.
- the nore box 25 is a non-bottomed, bottomed cylindrical container having an open top surface and a closed bottom surface, and has two upper and lower projections 27, 28 on the inner peripheral surface.
- a flange 26a is arranged between the convex portions 27 and 28.
- a coil spring 30 is interposed as a biasing member between the upper convex portion 27 and the flange portion 26a in a stored state. The valve body 26 is urged downward by the coil spring 30, and the flange portion 26 a is pressed against the lower convex portion 28. In a state in which the flange portion 26a is pressed against the convex portion 28, the valve body 26 is in a closed state.
- valve body 26 is flush with the bottom surface of the lower mold 22.
- the upper end surface of the valve box 25 is also flush with the bottom surface of the lower mold 22.
- An air tube 25 a is provided at the lower part of the valve box 25.
- a mold release agent is applied to the inner surface of the mold 20.
- a raw material liquid such as urethane is supplied into the lower mold 22, and after the upper mold is clamped, bubbles are generated as shown in FIG. 7a.
- open the upper mold as shown in Fig. 7b, send air into the valve box 25, and push the molded product 31 up with air pressure to remove the mold.
- valve body 26 When the air supply to the valve box 25 is stopped after the mold removal, the valve body 26 is pushed down by the urging force of the coil spring 30 and returns to the state shown in FIG. 8a. Therefore, it moves to the next molding cycle.
- the present invention provides a foam molding method that eliminates the above-mentioned problems, can efficiently mold a foam-molded product with good outer surface accuracy, and can be easily removed, and a mold therefor. aimed to.
- the mold for foam molding according to the first aspect of the present invention is a mold for foam molding having an upper mold and a lower mold, and the molding in the cavity is formed on the bottom surface of the cavity of the lower mold.
- a mold provided with gas blowing means for pushing up and releasing the product is provided with a recess connected to the lower mold cavity on the mating surface of the lower mold.
- the mating surface is provided with a convex portion that fits into the concave portion.
- the foam molding method according to the second aspect of the present invention is a foam molding method using the foam molding die according to the first aspect, wherein a raw material is supplied into the lower mold and the mold is clamped. Then, the upper mold is opened, and the molded product is demolded by blowing gas between the molded product and the bottom surface of the lower mold from the gas blowing means.
- the traces from which the protrusions have come out are void. It becomes exposed. Therefore, when the molded product is pushed up by applying a gas pressure to the lower side of the molded product, the tool or the operator's fingertip is applied to the side of the molded product through the void even when the raised height is small. The molded product can be taken out.
- the upper die By providing a draft to the convex and concave portions, the upper die can be easily separated from the lower die force. In addition, the mold can be easily assembled.
- the molded product can be taken out more easily.
- the molded product can be taken out very easily so as to be sandwiched from both sides.
- the molded product can be easily taken out by applying two different forces to the molded product with a tool or a finger.
- the cost can be reduced by using air as the gas blown to the lower side of the molded product at the time of mold removal.
- the foam molding die and foam molding method of the present invention can be applied to molding of other products with a force suitable for molding of rigid urethane foam.
- FIG. 1 is a perspective view showing a foam molding die according to an embodiment.
- Fig. Lb is a perspective view of a molded product manufactured using the mold shown in Fig. La.
- FIG. 2 A sectional view taken along line II-II in Fig. La.
- FIG. 3a is a cross-sectional view for explaining a foam molding method using the mold shown in FIG. La.
- FIG. 3b is a cross-sectional view for explaining a foam molding method using the mold shown in FIG. La.
- FIG. 3c is a sectional view for explaining a foam molding method using the mold shown in FIG. La.
- FIG. 4a is a cross-sectional view of the gas supply means.
- Fig. 4b is a cross-sectional view of the gas supply means.
- FIG. 5 is a perspective view showing a mold for foam molding according to another embodiment.
- FIG. 6a is an explanatory view showing a conventional example.
- FIG. 6b is an explanatory view showing a conventional example.
- FIG. 6c is an explanatory diagram showing a conventional example.
- FIG. 7a is an explanatory view showing another conventional example.
- FIG. 7b is an explanatory diagram showing another conventional example.
- FIG. 8a is a sectional view of the gas supply means.
- FIG. 8b is a sectional view of the gas supply means.
- FIG. 9a is an explanatory diagram showing another conventional example.
- FIG. 9b is an explanatory view showing another conventional example.
- FIG. La is a perspective view of a mold for foam molding according to the embodiment
- Fig. Lb is a perspective view of a molded product manufactured using the mold of Fig. La
- Fig. 2 is II of Fig. La
- FIGS. 3a, 3b and 3c are cross-sectional views illustrating a foam molding method using the mold shown in FIG. La.
- This mold 20B includes an upper mold 21B and a lower mold 22B.
- the heel J surfaces 50a, 50b, 50c, 50d of the cavity 50 in the lower mold 22B are provided with draft angles (draft tapers) of appropriate angles.
- Gas blowing means 23 is provided on the bottom surface of the lower mold 22B.
- the gas blowing means 23 is the same as that shown in FIG. 8, and a valve box 25 attached to the bottom opening of the lower die 22B, and a valve body 26 disposed in the valve box 25 so as to be movable upward and downward. And have.
- Concave portions 51, 51 are provided in the die mating surface (upper surface) 22f of the lower die 22B so as to continue to a part of the opposite side surfaces 50a, 50c of the cavity 50.
- each recess 51 has a depth reaching the bottom surface of the cavity 50.
- a pair of convex portions 52, 52 are provided on the die mating surface (lower surface) 21f of the upper die 21B so as to be fitted into the concave portions 51.
- the concave portion 51 and the convex portion 52 have the same size, and both are of a size that fits so-called without any gap.
- the concave portion 51 and the convex portion 52 are provided with a removal gradient.
- the convex portion 52 has a substantially quadrangular prism shape, and the four side surfaces are tapered so that the cross-sectional shape of the column becomes smaller toward the bottom in order to provide a blanking gradient.
- the three side surfaces of the concave portion 51 have a taper shape following the three side surfaces of the convex portion 52.
- a mold release agent is applied to the inner surface of the mold 20B.
- a raw material liquid such as urethane is supplied into the lower mold 22B, and after the upper mold 21B is clamped, it is foamed as shown in FIG. 3a.
- After curing urethane foam open the upper mold as shown in Fig. 3b.
- air is fed into the valve box 25, and the molded product 31B is pushed up with air pressure and removed from the mold.
- the molded product 31B When air is blown into the valve box 25 from the air tube 25a, the molded product 31B is pushed up. Therefore, the molded product 31B is grasped with a tool or a hand and removed from the lower mold 22B. In this case, even if the pushed-up height of the molded product 31B is insufficient, the concave portions 51 are formed on both side surfaces of the molded product 31B. The tool 31B can be easily pulled out from the cavity 50 by placing a tool or finger on both sides of the product 31B.
- the recesses 51 and 51 are provided only in part of the side surfaces 50a and 50c of the cavity 50, the air blown to the lower side of the molded product 31B passes through the recess 51. The There is little air to escape. Therefore, the molded product 31B can be sufficiently pushed up with air pressure. Even when air cannot be supplied from the valve box 25 into the cavity 50 due to a pump failure, etc., the molded product 31 B can be removed from the cavity 50 by inserting a tool or fingertip into the recess 51. it can.
- the top surface of the valve body 26 is flat, and when the valve body 26 is closed, it is flush with the bottom surface of the surrounding lower mold. There is no trace of the valve body 26 at all. Further, since the molded product 31B is pushed up only by air pressure, the molded product 31B does not have any pushed up marks. Further, the molded product 31B is molded so as to be in direct contact with the inner surface of the lower mold 22B, and no film is interposed between the two, so that no wrinkles of the film are transferred to the molded product 31B. For this reason, the molded product 31B has extremely good outer surface properties.
- valve body 26 is the mushroom valve type shown in FIGS. 8a and 8b, but a flap type valve body 42 may be used as shown in FIGS. 4a and 4b.
- a valve box 41 constituting the gas blowing means 40 is attached to the opening of the lower die 22B, and the valve box 42 is attached to the valve box 41 via a hinge pin 43 so as to be rotatable. It is.
- a coil spring is wound around the hinge pin 43, and the valve body 42 is urged in the valve closing direction.
- the outer peripheral side of the upper surface of the valve box 41 is flush with the bottom surface of the lower mold 22.
- An inner peripheral side of the upper surface of the valve box 41 is a stepped portion 41a, and a valve element 42 is engaged with the stepped portion 41a.
- the upper surface of the valve body 42 is flush with the bottom surface of the surrounding lower mold 22B.
- valve body 42 When air is supplied into the valve box 41 from the air supply port 44 provided in the valve box 41, the valve body 42 is rotated upward by the air pressure, and the air is sent to the lower mold 22B as shown in Fig. 4b. It is blown between the bottom and the molded product. When the air supply is stopped, the valve element 42 is closed by the urging force of the coil spring. [0049] When this gas supply means 40 is used, it is possible to efficiently form a molded article having good outer surface properties.
- the concave portion 51 and the convex portion 52 may have a force having a substantially quadrangular prism shape or other shapes.
- it may be substantially bowl-shaped like the concave portion 51C and the convex portion 52C in FIG.
- the recess 51C is shallower than the cavity 50. Even in this case, the molded product can be sufficiently removed.
- the concave portion and the convex portion may be provided on two intersecting sides of the cavity 50.
- One or three or more convex portions 52 and concave portions 51 may be provided.
- the gas supply means may be supplied with a gas other than air.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/713,666 US9186822B2 (en) | 2004-09-06 | 2007-03-05 | Mold for foam molding and foam molding method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-258571 | 2004-09-06 | ||
JP2004258571A JP4635524B2 (ja) | 2004-09-06 | 2004-09-06 | 発泡成形方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/713,666 Continuation US9186822B2 (en) | 2004-09-06 | 2007-03-05 | Mold for foam molding and foam molding method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006027979A1 true WO2006027979A1 (ja) | 2006-03-16 |
Family
ID=36036264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/015877 WO2006027979A1 (ja) | 2004-09-06 | 2005-08-31 | 発泡成形用の金型及び発泡成形方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US9186822B2 (ja) |
JP (1) | JP4635524B2 (ja) |
CN (1) | CN100569479C (ja) |
WO (1) | WO2006027979A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8419412B2 (en) | 2009-09-18 | 2013-04-16 | Kabushiki Kaisha Toshiba | Nano-imprint mold and substrate with uneven patterns manufactured by using the mold |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101102054B1 (ko) | 2009-04-29 | 2012-01-04 | 신화에이치 주식회사 | 소프트 블럭의 제조 방법 |
KR101042295B1 (ko) * | 2010-08-12 | 2011-06-17 | 동신산업(주) | 캐비티와 코어 교체식 발포 폼 성형 금형 |
CN102107481B (zh) * | 2010-12-10 | 2013-07-10 | 刘军 | 一种滚塑成型中空类产品尺寸精度控制方法 |
EP2826611A1 (de) * | 2013-07-18 | 2015-01-21 | HILTI Aktiengesellschaft | Verfahren zur Herstellung von Schaumformteilen in einer Verpackungshülle und Verkaufseinheit |
DE102015203662A1 (de) * | 2015-03-02 | 2016-09-08 | Polytec Car Styling Hörsching GmbH | Schäumstanzwerkzeug und Verfahren zur Herstellung von Schaumteilen |
CN104924516B (zh) * | 2015-07-02 | 2017-02-15 | 长江大学 | 一种冰箱门体发泡模具的开模装置 |
US10357904B2 (en) * | 2015-10-30 | 2019-07-23 | Nike, Inc. | Method of foaming an injection molded precursor |
CN107756614B (zh) * | 2017-10-20 | 2023-10-17 | 河南新天合农牧机械有限公司 | 漏缝板脱模装置 |
CN111873442A (zh) * | 2020-08-20 | 2020-11-03 | 武汉市裕同印刷包装有限公司 | 一种压合工具 |
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JPS636813U (ja) * | 1986-06-27 | 1988-01-18 | ||
JPH07195433A (ja) * | 1993-12-31 | 1995-08-01 | Tokyo Seat Kk | 表皮一体成形用金型 |
JP2003062842A (ja) * | 2001-08-24 | 2003-03-05 | Inoac Corp | 発泡成形型及び発泡成形品の製造方法 |
JP2004114646A (ja) * | 2002-09-30 | 2004-04-15 | Toyota Motor Corp | 発泡体成形装置及び発泡体成形方法 |
JP2004209851A (ja) * | 2003-01-06 | 2004-07-29 | Bridgestone Corp | 発泡成形用の金型及び発泡成形方法 |
Family Cites Families (10)
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US2767436A (en) * | 1952-08-25 | 1956-10-23 | Sanders | Methods of forming smooth surfaces on thermoplastic sponge |
USRE28364E (en) * | 1965-07-09 | 1975-03-18 | Method for forming foam articles | |
JPS58153018U (ja) * | 1982-04-08 | 1983-10-13 | 株式会社ショ−コン | 梱包用緩衝材の成型装置 |
JPH058235A (ja) * | 1991-07-05 | 1993-01-19 | Kanegafuchi Chem Ind Co Ltd | 構造部材を有する発泡樹脂成形品及び構造体及び成形方法 |
JP2955197B2 (ja) * | 1994-11-27 | 1999-10-04 | 株式会社イノアックコーポレーション | 発泡成形品の製造方法及びその成形用金型 |
CA2162778A1 (en) * | 1995-04-19 | 1996-10-20 | James R. Pritchard | Panel with integral energy absorber and air duct |
US5728333A (en) * | 1995-12-25 | 1998-03-17 | Bridgestone Corporation | Method for making and then removing a molded article of rigid polyurethane foam from a mold |
JP3772242B2 (ja) | 1995-12-25 | 2006-05-10 | 株式会社ブリヂストン | 硬質ポリウレタンフォームモールド成形品の製造方法 |
US6787091B2 (en) * | 2002-10-23 | 2004-09-07 | Acushnet Company | Reaction injection and compression molding of a golf ball |
US7422529B2 (en) * | 2004-03-10 | 2008-09-09 | Acushnet Company | Mold for a golf ball |
-
2004
- 2004-09-06 JP JP2004258571A patent/JP4635524B2/ja not_active Expired - Fee Related
-
2005
- 2005-08-31 CN CNB200580029840XA patent/CN100569479C/zh not_active Expired - Fee Related
- 2005-08-31 WO PCT/JP2005/015877 patent/WO2006027979A1/ja active Application Filing
-
2007
- 2007-03-05 US US11/713,666 patent/US9186822B2/en not_active Expired - Fee Related
Patent Citations (5)
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JPS636813U (ja) * | 1986-06-27 | 1988-01-18 | ||
JPH07195433A (ja) * | 1993-12-31 | 1995-08-01 | Tokyo Seat Kk | 表皮一体成形用金型 |
JP2003062842A (ja) * | 2001-08-24 | 2003-03-05 | Inoac Corp | 発泡成形型及び発泡成形品の製造方法 |
JP2004114646A (ja) * | 2002-09-30 | 2004-04-15 | Toyota Motor Corp | 発泡体成形装置及び発泡体成形方法 |
JP2004209851A (ja) * | 2003-01-06 | 2004-07-29 | Bridgestone Corp | 発泡成形用の金型及び発泡成形方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8419412B2 (en) | 2009-09-18 | 2013-04-16 | Kabushiki Kaisha Toshiba | Nano-imprint mold and substrate with uneven patterns manufactured by using the mold |
Also Published As
Publication number | Publication date |
---|---|
JP4635524B2 (ja) | 2011-02-23 |
US20070222098A1 (en) | 2007-09-27 |
CN101010178A (zh) | 2007-08-01 |
US9186822B2 (en) | 2015-11-17 |
CN100569479C (zh) | 2009-12-16 |
JP2006069159A (ja) | 2006-03-16 |
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