WO2010072855A1 - Éjecteur pour coulée sous-marine dans des parties fixes de moules d'injection thermoplastiques - Google Patents

Éjecteur pour coulée sous-marine dans des parties fixes de moules d'injection thermoplastiques Download PDF

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Publication number
WO2010072855A1
WO2010072855A1 PCT/ES2009/000345 ES2009000345W WO2010072855A1 WO 2010072855 A1 WO2010072855 A1 WO 2010072855A1 ES 2009000345 W ES2009000345 W ES 2009000345W WO 2010072855 A1 WO2010072855 A1 WO 2010072855A1
Authority
WO
WIPO (PCT)
Prior art keywords
fixed parts
thermoplastic injection
submarine
ejector
injection moulds
Prior art date
Application number
PCT/ES2009/000345
Other languages
English (en)
Spanish (es)
Inventor
Miguel Angel Torres Portero
Original Assignee
Universidad De Zaragoza
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 Universidad De Zaragoza filed Critical Universidad De Zaragoza
Publication of WO2010072855A1 publication Critical patent/WO2010072855A1/fr

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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
    • 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
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • B29C45/401—Ejector pin constructions or mountings

Definitions

  • the main object of the present invention is to simplify, facilitate and ensure the extraction of underwater castings located in the fixed part of the injection molds for thermoplastics.
  • the plastic injection processes consist of heating the pellets of a thermoplastic material to transform them into a mass type through a plasticizing cylinder, giving the mold the final shape.
  • Injection machines have hydraulic systems, which control the movement of injection and closure systems; and electrical systems, which control temperatures, water flow, oil, etc.
  • Cold casting is a component of the Injected part and needs longer injection cycles. This system is applied for small parts.
  • the cold channels take the plastic to the mold cavities and do not have temperature control systems such as hot and cast channel systems.
  • the main features of cold cast and channel plastic injection molds are: high cycle times, complicated demoulding mechanism, large amount of material waste, difficult product repeatability, very large mold opening distances (runs) and projection / distribution of complex cavities.
  • the path of the material to the cavity should be as short as possible to, among other things, minimize pressure and heat losses.
  • the injected parts contract on the mold males, for their demolding different types of ejectors are applied: rod, tubular, extractor plate, flat, combined, pneumatic, with cam, etc.
  • the type of extractor or ejector is a function of the shape of the piece to be injected.
  • the surface pressure on the piece to be ejected must be the minimum possible to avoid deformations.
  • the ejectors serve not only for demolding, but also for the evacuation of gases from the cavity.
  • a defective exit of the cavity can have as a consequence a partial filling of the cavity, defective union of material fronts or the so-called Diesel effect
  • the ejector object of this invention has some advantages of application that derive from the possibility of performing standardized and automated injection processes on those parts in which manipulation is required to separate them from the casting.
  • the high risk of damage to the mold is reduced, avoiding functional wear due to friction.
  • the ejector comprises a metal rod that has as its main feature its upper end, head, which shows a fungiform configuration, establishing its dimensions depending on the size of the casting and the thermoplastic part to be extracted.
  • the ejector simplifies, facilitates (by anchoring in the fixed part, between the ejector plates, an injection mold for thermoplastics) and ensures the extraction of underwater castings located in the fixed (female) part of the injection molds for thermoplastics, holding them at the time of opening the mold and thus avoiding unwanted grip of the same, which would force to interrupt the injection process and proceed to the manual extraction of the laundry.
  • the ejector is preferably conceived of steel F521 tempered to core 54 HRC and nitrided to the outside> 950 HV 0.3, in order to avoid functional wear by friction. DESCRIPTION OF THE DRAWINGS
  • Figure 1. Shows an elevation view of a fungiform ejector for injection molds made in accordance with the object of the present invention.
  • a preferred embodiment of the ejector object of the invention which, as observed in the figure, basically comprises: a metal rod (1) of hardened and nitrided steel, of variable geometric shape and size, depending on the size of the laundry and of the thermoplastic part to be extracted, a lower body (2) and a fungiform head (3) that represents the main feature of the invention and that avoids functional wear due to friction, reducing the high risk of damage to the mold.
  • the rod (1) is cylindrical.
  • the rod (1) is of rectangular section with its faces parallel two to two, which allows machining and subsequent grinding of all its faces is much cheaper and it is possible to do it with conventional machinery.

Landscapes

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

Abstract

La présente invention concerne une tige métallique (1) en acier trempé et nitruré, ayant une dimension et une forme géométrique variables, dépendant de la taille de la coulée et de la pièce thermoplastique à éjecter, le modèle cylindrique étant le plus utilisé; un corps inférieur (2) et une tête (3) fongiforme qui constitue la caractéristique principale de l'invention et qui empêche l'usure fonctionnelle par frottement, ce qui réduit le risque élevé d'endommagement du moule et par conséquent économise du temps et de l'argent.
PCT/ES2009/000345 2008-12-22 2009-06-29 Éjecteur pour coulée sous-marine dans des parties fixes de moules d'injection thermoplastiques WO2010072855A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200803641A ES2341636B1 (es) 2008-12-22 2008-12-22 Expulsor para colada submarina en partes fijas de moldes de inyecciontermoplasticos.
ESP200803641 2008-12-22

Publications (1)

Publication Number Publication Date
WO2010072855A1 true WO2010072855A1 (fr) 2010-07-01

Family

ID=42236255

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES2009/000345 WO2010072855A1 (fr) 2008-12-22 2009-06-29 Éjecteur pour coulée sous-marine dans des parties fixes de moules d'injection thermoplastiques

Country Status (2)

Country Link
ES (1) ES2341636B1 (fr)
WO (1) WO2010072855A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9238312B2 (en) 2010-09-29 2016-01-19 Comercial De Utiles Y Moldes, S.A. Plastic injection mould with inner air extraction and extraction method for extracting the air carried out with said mould

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0872068A (ja) * 1994-09-01 1996-03-19 Sekisui Chem Co Ltd 成形金型用ピン
US5639488A (en) * 1994-11-25 1997-06-17 Sumitomo Wiring Systems, Ltd. Molding apparatus
JPH10180809A (ja) * 1996-12-24 1998-07-07 Asahi Chem Ind Co Ltd ガス併用射出成形用金型
ES2170702A1 (es) * 2000-10-25 2002-08-01 Pruna Alberto Navarra Expulsor flexible para moldes de inyeccion.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0872068A (ja) * 1994-09-01 1996-03-19 Sekisui Chem Co Ltd 成形金型用ピン
US5639488A (en) * 1994-11-25 1997-06-17 Sumitomo Wiring Systems, Ltd. Molding apparatus
JPH10180809A (ja) * 1996-12-24 1998-07-07 Asahi Chem Ind Co Ltd ガス併用射出成形用金型
ES2170702A1 (es) * 2000-10-25 2002-08-01 Pruna Alberto Navarra Expulsor flexible para moldes de inyeccion.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; AN 1996-204272, RETRIEVED *
DATABASE WPI Derwent World Patents Index; AN 1998-432395 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9238312B2 (en) 2010-09-29 2016-01-19 Comercial De Utiles Y Moldes, S.A. Plastic injection mould with inner air extraction and extraction method for extracting the air carried out with said mould

Also Published As

Publication number Publication date
ES2341636A1 (es) 2010-06-23
ES2341636B1 (es) 2011-08-12

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