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WO1981002995A1 - Procede de moulage par injection et dispositif permettant de mettre en oeuvre - Google Patents

Procede de moulage par injection et dispositif permettant de mettre en oeuvre Download PDF

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Publication number
WO1981002995A1
WO1981002995A1 PCT/JP1980/000082 JP8000082W WO8102995A1 WO 1981002995 A1 WO1981002995 A1 WO 1981002995A1 JP 8000082 W JP8000082 W JP 8000082W WO 8102995 A1 WO8102995 A1 WO 8102995A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin
land
press
injection
gate
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/JP1980/000082
Other languages
English (en)
Japanese (ja)
Inventor
H Hara
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.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries 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 Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to PCT/JP1980/000082 priority Critical patent/WO1981002995A1/fr
Publication of WO1981002995A1 publication Critical patent/WO1981002995A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/57—Exerting after-pressure on the moulding material
    • B29C45/572—Exerting after-pressure on the moulding material using movable mould wall or runner parts
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/57—Exerting after-pressure on the moulding material
    • B29C45/572—Exerting after-pressure on the moulding material using movable mould wall or runner parts
    • B29C2045/577—Exerting after-pressure on the moulding material using movable mould wall or runner parts pushing the material in the runner channel until a pin or slider reaches the mould cavity wall

Definitions

  • the present invention relates to an injection molding method and apparatus for performing high-pressure molding of a synthetic resin product such as a thermoplastic resin or a thermosetting resin.
  • the present invention enables high-pressure molding of a synthetic resin such as a thermoplastic resin or a thermosetting resin without using a large-sized injection machine, and leaves an injection gate mark on an injection-molded product.
  • the purpose of the present invention is to prevent the occurrence of marks and to prevent sink marks or deformation due to shrinkage or the like of a molding material.
  • Another object of the present invention is to provide an injection molding method and apparatus which can control an injection machine more easily than conventional injection molding and can shorten the injection molding cycle. It is.
  • a predetermined amount of resin is injected from a resin passage through a press-fitting land into a capty formed by clamping a mold, and then fitted into the press-fitting land: 7 ° Langer] 3 After closing the press-fit land gate and interrupting the connection between the press-fit land and the resin passage, it is determined from the pressure inside the cavity and the amount of shrinkage when the resin solidifies.
  • the present invention provides an injection molding method characterized by press-fitting the residual resin in a press-fitting land into a capital.
  • the captive formed and the resin passage are displaced through the press-fitting land, and the captive surface is reduced within the press-fitting land. Both of them reciprocate between a position where the press-fit land gate is opened and an injection molding apparatus characterized by inserting a 7 ° runner.
  • FIG. 1 is a front sectional view of a conventional injection mold
  • FIG. 2 is a perspective view of a conventional injection molded product
  • FIG. 5 is a front sectional view of one embodiment of the injection mold of the present invention
  • FIG. 4a, 4b and 4c are enlarged views of the press-fit land in Fig. 5, which show the state at the time of injection, injection completion, and molding completion, respectively.
  • FIG. 3o5 is a front sectional view of another embodiment of the injection molding die of the present invention, FIG. 0a, FIG. 0b and FIG.
  • the enlarged view of the press-fit land in Fig. 5 shows the state at the time of injection, injection completion, and molding completion, respectively.
  • FIG. 1 shows a conventional injection mold, which is formed by molds 1 and 1 '.
  • a capty 2 is formed, and a runner 1 and a mold 3 connected to molds 1 and 2 are connected to each other.
  • a resin passage (runner) 4 is provided between the resin and the injection machine, which is shown in the figure, and the runner 14 and the cavity 2 pass through an injection gate having a very small pore. They are always in communication.
  • Reference numeral 10 denotes a heater for heating the resin on the inlet side of the injection gate.
  • the injection material (resin) from the injection machine is injected into the capite 2 through the runner 4 through the injection gate, which has a very fine hole.
  • FIG. 3 shows an embodiment of the present invention, wherein reference numerals 1 and 1 'are dies, and a capty 2 is formed by the dies.
  • Reference numeral 3 denotes a runner die connected to the dies 1 and 1 'described above, and a resin passage (run) 4 which is not shown in the drawing and which communicates with the injection machine is provided.
  • Reference numeral 5 denotes a press-fitting land—an end of which is open to the cavity surface, and the press-fitting land 5 slides up to the cavity surface. Runger 6 is inserted.
  • the gate 7 of the resin passage 4 is open within the moving range of the 7 ° runner 6] 9, and the gate 7 is a flanger. It is opened and closed by the movement of 6. That is, h. 9) Resin passage 4 and E inlet land 5 are disconnected or blocked. 8, 8 'are hydraulic chambers of the plunger 6, 9, 9' are liquid passages, and 10 is a heater o
  • FIG. 3 first, the molds 1 and 1 'are clamped to form a capty 2, and the plunger 6 inserted into the press-fitting land 5 is shown in FIG. 4a.
  • the upper part of the gate 7, that is, the resin passage 4 and the press-fit land 5 are not connected.
  • an injection machine (not shown) is operated, and the resin is injected (injected) into the capital 2 from the injection machine via the resin passage (runner) 4 and the press-fit land 5.
  • the resin is injected (injected) into the capital 2 from the injection machine via the resin passage (runner) 4 and the press-fit land 5.
  • FIG. 5 shows another embodiment of the present invention, wherein 1 is a mold, 3 is a runner mold, and 11 is a protruding pin.
  • Caper 2 is formed by the inner mold 5 and the protruding pin 11.
  • Reference numeral 4 denotes a resin passage (runner) provided in the runner mold 3.
  • V IPO In addition to communicating with a large injection machine shown in FIG. 1 via a filter 11, the other is connected to the cavity 2 via a press-fitting land 5.
  • Reference numeral 6 denotes a flange fitted in the resin passage 4 and the press-fitting land 5.
  • the piston 14 is inserted into the cylinder 13 with a ranger.]), And the oil passages 15 and 16 are inserted into the cylinder 13.
  • the pressure oil supplied and discharged reciprocates between the outer surface of the capty 2 and the resin passage 4. This fu.
  • the outer diameter of the flange 6 is loosely fitted in the resin passage 4 and the outer diameter of the flange 6 is tightly fitted in the press-fit land 5.], and the plunger 6 is a joint between the plastic passage 4 and the press-fit land 5.
  • Reference numeral 17 denotes a protruding pin for a resin passage, which is elastically pressed by a panel 19 having a weaker mold clamping force J through a protruding piston 18.
  • 20 is a mold temperature adjusting fluid passage
  • 21 is a mold temperature adjusting fluid conduit
  • 22 is a runner mold temperature adjusting fluid passage.
  • FIG. 5 operates similarly to the embodiment shown in FIG. First, the mold 1 and the runner mold 3 are clamped to form a capital 2. At this time, as shown in Fig. 0a. The runner 16 is pulled up into the resin passage 4] 9, and the resin passage 4 and the press-fit land 5 are kept in communication. In this state, make an injection machine not shown.
  • the runner mold 3 is a cold mold, and the resin in the resin passage 4 is taken out (released) for each molding cycle.
  • the runner mold is a hot runner mold, and the resin in the resin passage 4 is molded in the next step without rejecting the inside of the resin passage 4 for each molding cycle. It goes without saying that it is possible to make use of it.
  • the communication between the press-fitting land 5 and the resin passage 4 is cut off by the plunger 6]), and the ° 6) ?? Pressurizes the remaining resin in the press-in land 5 to maintain the pressure during the molding (solidification) in the capital 2 and replenish the shrinkage of the molding material (resin) during solidification.
  • the injection machine does not need to switch to the holding pressure after injection, so that the injection screw or injection plunger can be easily controlled and the injection (injection) amount can be accurately controlled.
  • the injection gate directly connected to the capite is large, so that the gate does not remain on the molded product, and the captive is pressurized by the positive landing force.
  • the pressure is transmitted to all or enough inside the capi- ty, and before starting the injection, the 7 ° run, depending on the runner])
  • the gate connecting the resin passage and the press fit land should be closed.
  • the gate resin depends on the blanger.] Every 9 cycles It is cleaned at the gate part by the previous injection!
  • the injection gate was blocked due to the mixture of the cooled material (cold slug) into the next injection material, etc.), and contact between materials with different temperatures in the early and late injection periods It has the effect of preventing the occurrence of flow marks caused by the above-mentioned factors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Une cavite de moulage (2) formee par des matrices de moulage (1, 1') communique avec un passage de resine (4) au travers d'une surface de contact (5) adaptee par pression possedant un diametre relativement large, et un piston (6) est introduit telescopiquement dans la surface de contact pour executer un mouvement alternatif entre la surface de la cavite et la position ouverte avec une porte de surface de contact (7). Lorsque la resine est moulee, le piston est souleve pour ouvrir la porte de surface de contact, reduisant ainsi sa perte de pression. Apres le moulage de la resine, le piston est abaisse pour fermer la porte de la surface de contact, et deplace jusqu'a son extremite pour atteindre la surface de la cavite. De ce fait, il exerce une pression sur la resine retenue dans la surface de contact qui a son tour exerce une pression sur la resine contenue dans la cavite, ce qui permet de compenser le retrait de la resine et de former une surface lisse de finissage sur un produit moule ne presentant aucune trace de moulage.
PCT/JP1980/000082 1980-04-22 1980-04-22 Procede de moulage par injection et dispositif permettant de mettre en oeuvre Ceased WO1981002995A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1980/000082 WO1981002995A1 (fr) 1980-04-22 1980-04-22 Procede de moulage par injection et dispositif permettant de mettre en oeuvre

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOJP80/00082 1980-04-22
PCT/JP1980/000082 WO1981002995A1 (fr) 1980-04-22 1980-04-22 Procede de moulage par injection et dispositif permettant de mettre en oeuvre

Publications (1)

Publication Number Publication Date
WO1981002995A1 true WO1981002995A1 (fr) 1981-10-29

Family

ID=13706029

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1980/000082 Ceased WO1981002995A1 (fr) 1980-04-22 1980-04-22 Procede de moulage par injection et dispositif permettant de mettre en oeuvre

Country Status (1)

Country Link
WO (1) WO1981002995A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273769A3 (fr) * 1986-12-31 1989-07-26 Kingsley Nominees Pty. Ltd. Procédé et dispositif de moulage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52133029A (en) * 1976-04-30 1977-11-08 Toyoda Gosei Kk Production method of mould and construction of metal pattern
JPS5465760A (en) * 1977-11-04 1979-05-26 Yoshida Kogyo Kk Method and apparatus for preventing whisker of plastic molded body

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52133029A (en) * 1976-04-30 1977-11-08 Toyoda Gosei Kk Production method of mould and construction of metal pattern
JPS5465760A (en) * 1977-11-04 1979-05-26 Yoshida Kogyo Kk Method and apparatus for preventing whisker of plastic molded body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0273769A3 (fr) * 1986-12-31 1989-07-26 Kingsley Nominees Pty. Ltd. Procédé et dispositif de moulage

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