WO2003090995A1 - Dispositif et procede de moulage par injection pour coulee a cire perdue - Google Patents

Dispositif et procede de moulage par injection pour coulee a cire perdue Download PDF

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Publication number
WO2003090995A1
WO2003090995A1 PCT/JP2003/005161 JP0305161W WO03090995A1 WO 2003090995 A1 WO2003090995 A1 WO 2003090995A1 JP 0305161 W JP0305161 W JP 0305161W WO 03090995 A1 WO03090995 A1 WO 03090995A1
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WO
WIPO (PCT)
Prior art keywords
injection
injection pressure
wax
injection molding
pressure
Prior art date
Application number
PCT/JP2003/005161
Other languages
English (en)
Japanese (ja)
Inventor
Shozui Yasui
Original Assignee
M. Yasui & Co., Ltd.
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 M. Yasui & Co., Ltd. filed Critical M. Yasui & Co., Ltd.
Priority to AU2003235092A priority Critical patent/AU2003235092A1/en
Publication of WO2003090995A1 publication Critical patent/WO2003090995A1/fr

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
    • 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
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/241—Moulding wax
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • 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
    • 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
    • B29K2091/00—Use of waxes as moulding material
    • 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
    • B29K2891/00—Use of waxes as mould material

Definitions

  • the present invention relates to an injection molding apparatus and an injection molding method for a lost wax production, and more particularly to an injection molding apparatus and an injection molding method for a lost wax production used for manufacturing jewelry.
  • the following lost pox is often used.
  • the prototype in the production of jewelry, the following lost pox is often used.
  • the wax is burned and evaporated by raising the temperature in a furnace, and the molten metal is injected into the gypsum-shaped cavity formed as a result of the combustion and evaporation. It is intended to produce animal products.
  • a rubber mold is often used because the shape of the prototype is complicated.
  • a problem with conventional lost-wax molding using a rubber mold is that the shrinkage of the wax after injection causes the molded product to dent or dent in the expected shape, which is likely to cause so-called sink marks. there were. This was particularly noticeable in the case of a rubber mold having a thick pattern.
  • the injection pressure (injection pressure) of the low-melting-point box to the rubber mold in which a large amount of the box is injected and supplied in advance in anticipation of the wax shrinkage, is increased.
  • a method of maintaining the injection pressure has been performed.
  • the rubber mold is cut to remove the prototype Therefore, if the wax is injected while continuously applying a high injection pressure, burrs are likely to be generated at the cut end of the rubber mold and the periphery thereof.
  • cavitation may occur in the box, which tends to reduce the quality of the wax after manufacturing. Disclosure of the invention
  • an object of the present invention is to reduce the occurrence of sink marks, burrs, and cavitation due to shrinkage of a molded product in a cast wax production using an elastic mold used in the production of jewelry, and to obtain a high-quality product having a desired shape and weight.
  • An object of the present invention is to provide an injection molding apparatus and an injection molding method capable of obtaining wax.
  • Another object of the present invention is to suppress shrinkage of a molded product.
  • the injection pressure for injecting a hot-melt substance into a mold by an injection molding machine is as follows:
  • the injection pressure is the first injection pressure at the start of injection, and the second injection pressure is higher than the first injection pressure a predetermined time after the start of injection.
  • FIG. 1 is a perspective view showing an outline of a Pex injector 1 and an input device 20 which constitute an injection molding apparatus for Lost Pex production of an embodiment.
  • FIG. 2 is a perspective view showing the relationship between the tank 2 and the valve 3 of the embodiment.
  • FIG. 3 is a cross-sectional view of the valve 3 of the embodiment when viewed from a direction III in FIG.
  • FIG. 4 is a side view showing an outline of a photo clamp 30 which constitutes a part of the injection molding apparatus for lost box production of the embodiment.
  • FIG. 5 is a diagram showing the relationship between the injection time and the injection pressure in the example.
  • FIG. 1 is a perspective view showing an outline of a wax injector 1 and an input device 20 which constitute an injection molding device for lost-powder production of an embodiment.
  • FIG. 2 is a perspective view showing the relationship between the tank 2 and the valve 3 of the embodiment.
  • FIG. 3 is a cross-sectional view of the valve 3 of the embodiment when viewed from a direction III in FIG.
  • FIG. 4 is a side view showing an outline of an auto clamp 30 constituting a part of the injection molding apparatus for manufacturing a mouthpiece according to the embodiment.
  • FIG. 5 is a diagram showing the relationship between the injection time and the injection pressure (injection pressure) in the example.
  • the lost wax injection molding apparatus includes a wax injector (injection molding machine) 1, an input device 20, an auto clamp 30, and the like. The details will be described below.
  • Wax injection 1 is a tank (wax tank) 2 for storing a box (hot-meltable substance) that has the property of melting at a temperature of about 65, and the box is melted and melted.
  • a valve 3 having a temperature control function for maintaining and maintaining the most suitable injection temperature is provided inside.
  • the tank 2 stores wax therein and is sealed by a lid 4 having a sealing member (not shown).
  • the inside of the tank 2 can be pressurized by compressed gas.
  • the valve 3 has two valves, a vacuum valve 6 and an injection valve 7, independently of each other on opposite side surfaces.
  • the vacuum valve 6 can be opened by energizing the electromagnetic coil 8 for driving the vacuum valve 6, and the injection valve 7 is an injection valve. 7 It can be opened by energizing the electromagnetic coil 9 for driving.
  • the vacuum valve 6 communicates with the vacuum tank 5, and the injection valve 7 communicates with the tank 2 through the plastic injection pipe 10.
  • a heating nozzle 11 and an injection nozzle 12 are provided so as to face each other.
  • the injection nozzle 12 can have a rubber mold (elastic mold (elastic mold)) 13 adhered to its tip.
  • the mold having elasticity refers to a mold in which the mold deforms and recovers within elasticity at the time of injection pressure.
  • the input device 20 is connected to an injection molding machine, and has a liquid crystal screen 21 and a push button 22 on its upper surface.
  • the injection pressure, the total injection time, the injection time for each injection pressure, the box temperature in the tank 2, the temperature of the injection nozzle 12, the exhaust time of the injection nozzle 12 (vacuum time ), Mold holding pressure (mold pressure), mold holding time, rubber mold 13 type, rubber mold 13 lot number and other information (injection conditions) can be set and changed.
  • the type of the mold 13 is determined by the thickness, the outer dimensions, and the type of the wax pattern of the wax formed by the rubber mold 13.
  • the auto clamp 30 is fixed to a work table (not shown) via a base 31 in front of the injection nozzle 12 of the wax injector 1.
  • a stage 32 for mounting the rubber mold 13 is arranged via a forward cylinder 33. Since the stage 32 is fixed to the forward cylinder 33, the stage 32 can be moved in the horizontal direction by the horizontal movement of the forward cylinder 33.
  • a clamp cylinder 34 is arranged above the stage 32.
  • a plate 35 is provided on the lower surface of the clamp cylinder 34, and the rubber mold 13 mounted on the stage 32 is moved to the stage 32 and the plate 35 by the vertical movement of the clamp cylinder 34. It is sandwiched between and held.
  • the stage 32 is held while the rubber mold 13 is held. It is possible to advance to the wax injection side 1 to bring the spool 14 provided on one side surface of the rubber mold 13 and the injection nozzle 12 into close contact.
  • the vacuum valve is mounted on the injection nozzle 12 by the auto clamp 30 so that the inside of the rubber mold 13 is connected to the valve 3 through the spool.
  • the valve 6 is opened by energizing the electromagnetic coil for driving the vacuum valve 6, the valve 3 communicates with the vacuum tank 5 so that the inside of the injection nozzle 12 and the inside of the rubber mold 13 communicating through the injection nozzle 12 are inside. Void 15 is evacuated.
  • the injection valve 7 is opened by energizing the valve driving electromagnetic coil after the vacuum valve 6 is closed, the injection valve 7, the wax injection pipe 10 and the tank 2 communicate with each other.
  • the molten wax passes through the injection nozzle 12, obtains injection energy by the pressurized gas in the tank 2, and is injected into the void inside the rubber mold 13.
  • the following conditions are set for the rubber mold 13 for forming a pattern having a maximum thickness of 1 mm.
  • Second injection pressure holding time 10 seconds
  • Wax temperature in tank 2 70
  • the injection time and the injection pressure have the relationship shown in FIG. 5, and the inside of the rubber mold 13 is maintained at the first injection pressure for a predetermined holding time, and thereafter, the injection pressure is reduced to the second injection pressure. And maintained at the second injection pressure for a predetermined holding time.
  • the rubber mold 13 was evacuated for 2 seconds while being held down at 5 kg / cm 3 and the inside became a vacuum. Inject the wax held in.
  • the injection pressure at the start of injection is 0.3 kg / cm 3 for the first injection pressure.
  • injection for 10 seconds at 0.6 kgZcm 3 for the second injection (total injection time)
  • close injection valve 7 to end injection Therefore, the injection pressure at the end of the injection is 0.6 kg / cm 3 for the second injection pressure.
  • the holding by the auto clamp 30 is released, and the box is removed from the rubber mold 13.
  • injection is performed as follows. First, wax is injected and supplied into the rubber mold 13 at a first injection pressure which is a sufficiently low pressure that is not enough to spread the rubber mold 13. At this time, the first injection pressure is maintained for a predetermined holding time. Since the first injection pressure is set to a sufficiently low pressure that does not spread the rubber mold 13, the wax injected into the rubber mold 13 at the first injection pressure does not spread the rubber mold 13 but spreads the rubber mold 13. Spread enough within 13. For this reason, it is possible to avoid the possibility that the rubber mold 13 is pushed and spread, so that wax enters the cut end of the rubber mold 13 to generate burrs.
  • the above-mentioned predetermined holding time of the first injection pressure is such a time that the surface layer in contact with the inner surface of the rubber mold 13 of the wax injected at the first injection pressure is solidified.
  • the time required for the surface layer in contact with the inner surface of the rubber mold 13 to solidify is secured, so that after the predetermined holding time of the first injection pressure has elapsed, the injection is performed at the higher second injection pressure.
  • the solidified wax surface layer is a rubber mold 1 3Because the rubber mold 13 is pushed out because it is in contact with the inner surface, it is less likely that burrs will be generated due to the penetration of the plastic into the rubber cut.
  • the wax is injected and supplied at the second injection pressure which is high enough to push the rubber mold 13 apart.
  • the injection supply of the wax at the second injection pressure compensates for the volume contraction of the box in the rubber mold 13. For this reason, shrinkage of the molded product can be suppressed, and even if the wax solidifies before the holding time of the second injection pressure ends and the wax in the spool 14 completely solidifies, the rubber mold 1 3 is supplied with wax that is expected to shrink by the second injection pressure, so that a wax having a desired shape and weight can be obtained.
  • the desired molding can be achieved without shrinkage, burrs, and cavitation of the molded product.
  • High quality wax of shape and weight can be obtained.
  • the first injection pressure 0. 3 k gZ cm 3 the second is the injection pressure was set to 0. 6 kg Z cm 3, it is greater in the second injection pressure than the first injection pressure, and 0 if within the ⁇ 2 kg / cm 3, a first injection pressure and the second injection pressure can be set to any value.
  • the injection pressure has two steps, that is, the first injection pressure and the second injection pressure.
  • the injection pressure may be three or more steps.
  • the injection pressure may be continuously increased without holding for a fixed time.
  • the injection pressure may be given in a form in which stepwise increase and continuous increase are combined.
  • the injection pressure may be reduced during or at the end of injection.
  • the holding time of the first injection pressure is set to 1 second
  • the holding time of the second injection pressure is set to 10 seconds. However, any of these can be set between 0 and 20 seconds.
  • the material used for the mold may be other than rubber as long as the wax can be pressed inside the mold by injecting at a predetermined injection pressure to expand the mold. . That is, if a mold made of a material other than a rigid body is used, the same effect as in the above embodiment can be expected.
  • the vacuum tank 5 is used to exhaust the gap 15 inside the injection nozzle 12 and the rubber mold 13, but the vacuum tank 5 is omitted and the gap 15 is exhausted.
  • the injection may be performed.
  • Injection pressure total injection time, injection time for each injection pressure, wax temperature in tank 2, temperature of injection nozzle 1 and 2, exhaust time of injection nozzle 1 and 2 (vacuum time), press pressure of mold 13 (mold pressure)
  • the information such as the holding time (injection conditions) may be stored in advance in the input device 20, a separate storage device, or an injection machine for each type of the rubber mold 13.
  • injection is automatically performed according to preset conditions. It is also possible to create and store the injection program to be performed. In addition, by assigning a program for each type of the mold 13 to each push button of the input device 20, the injection condition can be set with one touch. Furthermore, by assigning information such as the injection pressure to each push button, it is possible to change the injection conditions with a single touch during injection.
  • the above embodiment relates to an injection molding apparatus and an injection molding method for producing a lost wax used for producing jewelry, but the present invention is not limited to the lost wax producing for producing jewelry.
  • the present invention has been described with reference to the above embodiments, the present invention is not limited to the above embodiments, and can be improved or changed within the scope of the purpose of improvement or the concept of the present invention.
  • the present invention in a lost box used in the production of jewelry, the occurrence of burrs, sink marks, cavitation and shrinkage of a molded product are suppressed, and a high-quality wax having a desired shape is produced.
  • An injection molding apparatus and an injection molding method that can be obtained can be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Dispositif et procédé de moulage par injection pour coulée à cire perdue. La pression d'injection permettant d'injecter une matière thermiquement fusible dans un moule élastique au moyen d'une machine de moulage par injection, est fixée à une première valeur au début de l'injection ; et à une deuxième valeur, supérieure à la première, un temps spécifié après le début de l'injection. Ce procédé permet d'éviter, pendant la coulée à cire perdue de produits ornementaux, tout retrait ainsi que la formation de barbes et de cavitation ; de supprimer le retrait des produits formés ; et d'obtenir une qualité supérieure de cire de formes spécifiées.
PCT/JP2003/005161 2002-04-26 2003-04-23 Dispositif et procede de moulage par injection pour coulee a cire perdue WO2003090995A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003235092A AU2003235092A1 (en) 2002-04-26 2003-04-23 Injection molding device and injection molding method for lost wax casting

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-125741 2002-04-26
JP2002125741A JP2003311794A (ja) 2002-04-26 2002-04-26 ロストワックス鋳造用射出成型装置およびロストワックス鋳造用射出成型方法

Publications (1)

Publication Number Publication Date
WO2003090995A1 true WO2003090995A1 (fr) 2003-11-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/005161 WO2003090995A1 (fr) 2002-04-26 2003-04-23 Dispositif et procede de moulage par injection pour coulee a cire perdue

Country Status (4)

Country Link
JP (1) JP2003311794A (fr)
AU (1) AU2003235092A1 (fr)
TW (1) TW200402357A (fr)
WO (1) WO2003090995A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104190863A (zh) * 2014-07-29 2014-12-10 宁波创二代机械科技有限公司 一种注蜡机中的抽芯装置
CN107866523A (zh) * 2017-11-09 2018-04-03 太湖县众瑞精密铸造有限公司 专用于精铸硅溶胶的压蜡工艺

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5368689B2 (ja) * 2007-10-24 2013-12-18 株式会社ブリヂストン Ｏａ機器装着用ブレードの製造方法
JP6197259B1 (ja) * 2015-11-11 2017-09-20 株式会社エイシン技研 ワックス型射出成型装置及びワックス型射出成型装置を用いた物品鋳造方法
CN111941724A (zh) * 2020-07-24 2020-11-17 上海亚虹模具股份有限公司 一种智能马桶便盖优化飞边的注塑工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49144811U (fr) * 1973-04-18 1974-12-13
JPS57162825U (fr) * 1981-04-02 1982-10-14
JPH0824989A (ja) * 1994-07-08 1996-01-30 Mitsubishi Materials Corp ロストワックス鋳造法におけるろう模型の成形方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49144811U (fr) * 1973-04-18 1974-12-13
JPS57162825U (fr) * 1981-04-02 1982-10-14
JPH0824989A (ja) * 1994-07-08 1996-01-30 Mitsubishi Materials Corp ロストワックス鋳造法におけるろう模型の成形方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104190863A (zh) * 2014-07-29 2014-12-10 宁波创二代机械科技有限公司 一种注蜡机中的抽芯装置
CN104190863B (zh) * 2014-07-29 2016-06-15 宁波创二代机械科技有限公司 一种注蜡机中的抽芯装置
CN107866523A (zh) * 2017-11-09 2018-04-03 太湖县众瑞精密铸造有限公司 专用于精铸硅溶胶的压蜡工艺

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Publication number Publication date
TW200402357A (en) 2004-02-16
AU2003235092A1 (en) 2003-11-10
JP2003311794A (ja) 2003-11-05

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