KR20120003737A - Manufacturing method for injection molding product with metal insert - Google Patents

Manufacturing method for injection molding product with metal insert Download PDF

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Publication number
KR20120003737A
KR20120003737A KR1020100064499A KR20100064499A KR20120003737A KR 20120003737 A KR20120003737 A KR 20120003737A KR 1020100064499 A KR1020100064499 A KR 1020100064499A KR 20100064499 A KR20100064499 A KR 20100064499A KR 20120003737 A KR20120003737 A KR 20120003737A
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South Korea
Prior art keywords
metal insert
injection
manufacturing
mold
molded article
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KR1020100064499A
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Korean (ko)
Inventor
홍형식
김상식
이재명
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엘지전자 주식회사
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Priority to KR1020100064499A priority Critical patent/KR20120003737A/en
Publication of KR20120003737A publication Critical patent/KR20120003737A/en

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    • 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
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection 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
    • 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
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C2045/1486—Details, accessories and auxiliary operations
    • B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D12/00—Producing frames
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3475—Displays, monitors, TV-sets, computer screens

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

Abstract

PURPOSE: A method of manufacturing injection-molded products with metallic inserts is provided to reduce costs by decreasing the number of processes and prevent distortion due to deformation by integrally forming metallic inserts and injection-molded products. CONSTITUTION: A method of manufacturing injection-molded products with metallic inserts(30) is as follows. The metallic inserts are formed by pre-strain considering thermal shrinkage. The metallic inserts with the pre-strain are inserted into a mold. Injection liquid is injected into the mold, and an injection-molded product integrated with the metallic insert is formed.

Description

금속인서트를 가지는 사출성형품의 제작방법{Manufacturing method for injection molding product with metal insert}Manufacturing method for injection molding product with metal insert}

본 발명은 금속인서트를 가지는 사출성형품의 제작방법에 관한 것으로, 더욱 상세하게는 금속인서트를 사출성형품에 삽입하는 공정을 생략하도록 금속인서트를 금형에 삽입한 상태에서 사출성형할 수 있는 금속인서트를 가지는 사출성형품의 제작방법에 관한 것이다.
The present invention relates to a method for manufacturing an injection molded article having a metal insert, and more particularly, to a metal insert capable of injection molding in a state where the metal insert is inserted into a mold so as to omit the step of inserting the metal insert into the injection molded article. The present invention relates to a method for manufacturing an injection molded article.

PDP 텔레비젼 또는 LCD 텔레비젼의 전면프레임을 구성하는 사출성형품에는 금속인서트를 사용하여 강도를 보강하고 있다.The injection molded parts forming the front frame of a PDP television or LCD television are reinforced with metal inserts.

이러한 금속인서트를 사출성형품에 삽입고정하는 방법으로는, 금속인서트와 사출성형품을 별개의 공정에서 각각 성형한 후, 상기 사출성형품 내측에 형성된 인서트홈에 금속인서트를 삽입하는 방식을 사용하고 있다. 이 때, 사출성형품과 금속인서트의 안정적인 고정을 위하여 접착제를 사용한다.As a method of inserting and fixing the metal insert into the injection molded article, the metal insert and the injection molded article are molded in separate processes, and then the metal insert is inserted into the insert groove formed inside the injection molded article. At this time, the adhesive is used to secure the injection molded article and the metal insert.

따라서, 접착제 사용에 따는 비용 상승 및 삽입공정시에 사출성형품이 변형되는 등의 불량으로 많은 손실이 발생되고 있다.
Therefore, a lot of losses are generated due to the increase in costs associated with the use of adhesives and defects such as deformation of the injection molded article during the insertion process.

상기의 문제점을 해결하기 위해 안출된 본 발명의 목적은, 금속인서트를 사출성형품에 삽입하는 공정을 생략하도록 금속인서트를 금형에 삽입한 상태에서 사출성형할 수 있는 금속인서트를 가지는 사출성형품의 제작방법을 제공하는 데에 있다.
An object of the present invention devised to solve the above problems, a method of manufacturing an injection molded article having a metal insert that can be injection molded in a state where the metal insert is inserted into the mold so as to omit the step of inserting the metal insert into the injection molded article. To provide.

상기 목적을 달성하기 위한 본 발명은, 금속인서트를 열수축을 고려한 예변형량을 가지도록 형성하는 단계; 상기 예변형량을 가지는 금속인서트를 금형에 삽입하는 단계; 및 상기 금속인서트가 삽입된 금형에 사출액을 주입하여 상기 금속인서트와 일체인 사출성형물을 형성하는 단계를 포함하는 금속인서트를 가지는 사출성형품의 제작방법이다.The present invention for achieving the above object, the step of forming a metal insert to have a strain amount considering heat shrinkage; Inserting the metal insert having the strain amount into a mold; And injecting the injection liquid into the mold into which the metal insert is inserted, to form an injection molding integrated with the metal insert.

상기 예변형량을 가지는 금속인서트는 상기 사출액과 동일한 온도를 가지도록 예열되는 것을 특징으로 한다.The metal insert having the deflection amount is preheated to have the same temperature as the injection liquid.

또, 상기 금속인서트와 일체인 사출성형물은 항온챔버 내에서 서냉시키는 것을 특징으로 한다.
In addition, the injection molding integral with the metal insert is characterized in that the cooling in a constant temperature chamber.

본 발명을 통하여, 공정수의 감축으로 인한 원가 절감 및 금속인서트와 일체로 성형되어 변형으로 인한 뒤틀림 등이 없는 고품격 제품 개발이 가능하다.Through the present invention, it is possible to develop a high-quality product without cost reduction due to the reduction of the number of processes and molded integrally with the metal insert without distortion due to deformation.

또, 금속인서트와 일체로 사출되기 때문에 종래기술의 접착제에 의한 고정방식보다 기계적 강도가 향상될 수 있다.
In addition, since it is injected integrally with the metal insert, the mechanical strength can be improved compared to the fixing method by the adhesive of the prior art.

도 1은 일반적인 텔레비젼의 전면프레임의 부분절단 사시도이다.
도 2는 열수축에 의해 변형된 텔레비젼의 전면프레임의 부분절단 사시도이다.
도 3은 본 발명의 실시예에 따른 제작금형의 사시도이다.1 is a partially cutaway perspective view of a front frame of a general television.
2 is a partially cutaway perspective view of the front frame of a television deformed by heat shrinkage.
3 is a perspective view of a manufacturing mold according to an embodiment of the present invention.

이하, 본 발명을 바람직한 실시예를 첨부한 도면을 참조하여 설명하기로 한다. 하기의 각 도면의 구성 요소들에 참조 부호를 부가함에 있어서, 동일한 구성 요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하며, 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

도 1은 본 발명에서 추구하고자 하는 금속인서트(12)를 가지는 사출성형품(10)의 부분절개 사시도이다. 그러나, 실제 금형에서 금속인서트(12)와 사출부(14)의 열수축량이 달라서, 도 2와 같이 열수축량이 더 큰 금속인서트(22)가 짧아지도록 변형된다.1 is a partially cutaway perspective view of an injection molded article 10 having a metal insert 12 to be pursued in the present invention. However, in the actual mold, the heat shrinkage of the metal insert 12 and the injection part 14 is different, so that the metal insert 22 having a larger heat shrinkage as shown in FIG. 2 is shortened.

따라서, 본 발명에서는 이러한 금속인서트(12)를 열수축을 고려하여 미리 예변형량을 가지도록 한다.Therefore, in the present invention, the metal insert 12 has a prestrain in advance in consideration of heat shrinkage.

즉, 도 3에 도시된 바와 같이, 도 2의 수축되는 모습과 반대의 변형을 미리 부여함으로써, 열수축에 의해 최종적으로 도 1의 모습을 가지도록 한 것이다.That is, as shown in Figure 3, by deforming in advance the reverse of the shrinking state of Figure 2, it is to have a final state of Figure 1 by the heat shrink.

상기 예변형량은 3차원적으로 가해져야 하며, 이 때의 예변형량은 시뮬레이션 및 반복실험을 통해 결정할 수 있다.The prestrain should be applied in three dimensions, and the prestrain may be determined through simulation and repeated experiments.

이렇게 예변형량을 가지는 금속인서트(30)를 하부금형(110)의 코어(112)에 삽입한다. 이 경우, 상기 금속인서트(30)가 사출액의 열로 인해 열팽창되는 것을 고려하여, 미리 사출액의 온도까지 예열하는 것이 바람직하다.Thus, the metal insert 30 having a prestrain amount is inserted into the core 112 of the lower mold 110. In this case, in consideration of thermal expansion of the metal insert 30 due to the heat of the injection liquid, it is preferable to preheat up to the temperature of the injection liquid in advance.

즉, 상기 금속인서트(30)는 사출액의 온도와 동일한 온도에서 프레스와 같은 외력을 통해 성형하여야 한다.That is, the metal insert 30 must be molded through an external force such as a press at the same temperature as the injection liquid.

또, 도시되지는 않았지만 사출액에 의한 부력으로 상기 금속인서트(30)가 유동하는 것을 방지하기 위해, 상기 하부금형(110)의 내부에는 상기 금속인서트(30)를 고정시키는 고정수단이 추가될 수 있다. 이러한 고정수단으로는 진공흡착기구를 사용할 수 있다.In addition, although not shown, in order to prevent the metal insert 30 from flowing due to buoyancy due to the injection liquid, a fixing means for fixing the metal insert 30 may be added to the inside of the lower mold 110. have. As the fixing means, a vacuum suction device may be used.

또, 상기 하부금형(110)의 내부에는 사출공정이 완성된 후, 사출성형품을 취출하기 위해 공지의 푸싱핀을 장착할 수 있다.In addition, after the injection process is completed, the lower mold 110 may be equipped with a known pushing pin to take out the injection molded article.

그리고, 상기 하부금형(110)의 상측으로 맞닿아 사출부에 상응하는 공동을 형성하고 사출액을 주입하는 상부금형(100)이 배치된다.Then, the upper mold 100 for contacting the upper side of the lower mold 110 to form a cavity corresponding to the injection portion and inject the injection liquid is disposed.

따라서, 금속인서트(30)를 열수축을 고려한 예변형량을 가지도록 형성하는 단계와, 상기 예변형량을 가지는 금속인서트(30)를 하부금형(110)에 삽입하는 단계와, 상기 금속인서트(30)가 삽입된 금형에 사출액을 주입하여 상기 금속인서트(30)와 일체인 사출성형물을 형성하는 단계를 거쳐 금속인서트(30)를 가지는 사출성형품이 완성된다.Therefore, forming the metal insert 30 to have a prestrain amount considering heat shrinkage, inserting the metal insert 30 having the prestrain amount into the lower mold 110, and the metal insert 30 The injection molded product having the metal insert 30 is completed by injecting the injection liquid into the inserted mold to form an injection molding integrated with the metal insert 30.

특히, 금속인서트(30)와 사출부는 냉각속도가 다르기 때문에, 상온에서 냉각시킬 경우 금속인서트(30)의 냉각속도가 사출부의 냉각속도보다 빠르기 때문에 금속인서트(30) 및 사출부에 열응력이 발생할 수 있고, 이러한 열응력이 사출부에는 소성변형으로 남겨질 우려가 있다.In particular, since the cooling speed of the metal insert 30 and the injection part is different, since the cooling speed of the metal insert 30 is faster than the cooling speed of the injection part when cooled at room temperature, thermal stress may occur in the metal insert 30 and the injection part. This thermal stress may remain as plastic deformation in the injection portion.

따라서, 상기 금속인서트(30)와 일체인 사출성형물은 공지의 항온챔버(미도시) 내에서 서냉시키는 것이 바람직하다.Therefore, it is preferable to cool the injection molding integrally with the metal insert 30 in a known constant temperature chamber (not shown).

상기와 같이, 본 발명의 바람직한 실시예를 참조하여 설명하였지만 해당 기술 분야의 숙련된 당업자라면 하기의 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경시킬 수 있음을 이해할 수 있을 것이다.
As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

10,20: 사출성형품 12,22,30: 금속인서트
14,24: 사출부 100: 상부금형
110: 하부금형 112: 코어10,20: Injection molded parts 12,22,30: Metal insert
14, 24: injection part 100: upper mold
110: lower mold 112: core

Claims (3)

금속인서트를 열수축을 고려한 예변형량을 가지도록 형성하는 단계;
상기 예변형량을 가지는 금속인서트를 금형에 삽입하는 단계; 및
상기 금속인서트가 삽입된 금형에 사출액을 주입하여 상기 금속인서트와 일체인 사출성형물을 형성하는 단계를 포함하는 금속인서트를 가지는 사출성형품의 제작방법.
Forming a metal insert to have a prestrain amount considering heat shrinkage;
Inserting the metal insert having the strain amount into a mold; And
And injecting the injection liquid into the mold into which the metal insert is inserted, thereby forming an injection molding integrated with the metal insert.
제1항에 있어서, 상기 예변형량을 가지는 금속인서트는 상기 사출액과 동일한 온도를 가지도록 예열되는 것을 특징으로 하는 금속인서트를 가지는 사출성형품의 제작방법.
The method of manufacturing an injection molded article having a metal insert according to claim 1, wherein the metal insert having the deflection amount is preheated to have the same temperature as the injection liquid.
제1항에 있어서, 상기 금속인서트와 일체인 사출성형물은 항온챔버 내에서 서냉시키는 것을 특징으로 하는 금속인서트를 가지는 사출성형품의 제작방법.The method of manufacturing an injection molded article having a metal insert according to claim 1, wherein the injection molded article integrated with the metal insert is annealed in a constant temperature chamber.
KR1020100064499A 2010-07-05 2010-07-05 Manufacturing method for injection molding product with metal insert KR20120003737A (en)

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KR1020100064499A KR20120003737A (en) 2010-07-05 2010-07-05 Manufacturing method for injection molding product with metal insert

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
KR20210019855A (en) 2019-08-13 2021-02-23 주식회사 엘지화학 A Housing of electrical component of battery module

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210019855A (en) 2019-08-13 2021-02-23 주식회사 엘지화학 A Housing of electrical component of battery module

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