KR920001604B1 - Forming method for synthetic resin articles by press - Google Patents

Forming method for synthetic resin articles by press Download PDF

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Publication number
KR920001604B1
KR920001604B1 KR1019890017391A KR890017391A KR920001604B1 KR 920001604 B1 KR920001604 B1 KR 920001604B1 KR 1019890017391 A KR1019890017391 A KR 1019890017391A KR 890017391 A KR890017391 A KR 890017391A KR 920001604 B1 KR920001604 B1 KR 920001604B1
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South Korea
Prior art keywords
press
synthetic resin
pressure
forming method
presses
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KR1019890017391A
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Korean (ko)
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KR910009408A (en
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안상익
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안상익
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Priority to KR1019890017391A priority Critical patent/KR920001604B1/en
Publication of KR910009408A publication Critical patent/KR910009408A/en
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Publication of KR920001604B1 publication Critical patent/KR920001604B1/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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps

Abstract

The method once more presses the formed product instantly before moving an elevation plate backward in forming the synthetic resin products. So the synthetic resin products have more smoothe surface and higher strength than the ones produced by conventional methods. The method comprises applying a pressure (about 300 kg) for a short time C one second) instantly before pressing the elevation plate (1) on up/down forming frame (3,4) by a hydraulic cylinder (2) with 250 kg pressure, 30-60 seconds.

Description

프레스기에 의한 합성수지 제품의 성형방법Molding method of synthetic resin product by press

제1도는 본 발명에 사용되는 프레스기의 정면 개략도.1 is a front schematic view of a press machine used in the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

가 : 프레스기 1 : 승강판A: Press machine 1: Lifting plate

3,4 : 상하성형틀3,4: up and down molding frame

본 발명은 합성수지 제품을 프레스기(press 機)로 가압 성형 함에 있어 성형이 완료되어 승강판의 후진직전에 순간적으로 한번더 눌러 주도록하는 프레스기에 의한 가압성형 방법에 관한 것이다.The present invention relates to a press molding method using a press machine to press the momentarily once just before the reverse of the lifting plate when the molding is completed in pressing the synthetic resin product by a press machine (press machine).

종래 합성수지 제품을 프레스기로 가압하여 성형할때는 승강판이 상승하여 일정압력으로 일정시간 가압하고 가압이 완료되면 즉시 후진하여 해압하고 탈형하는 방법으로 성형하였기 때문에 대체로 성형된 제품의 표면이 매끈하지 못하고 거칠며 표면강도가 높지 못한 문제점이 있는 것이었다.When pressing a synthetic resin product by pressing with a press, the lifting plate rises, presses it at a constant pressure for a certain time, and when pressing is completed, it is formed by a method of depressurizing and demolding. There was a problem that was not high.

또 제품의 강도를 높이기 위하여 가압과 해압을 반복하는 경우도 있으나 이러한 성형방법은 역시 가압 압력이 표면에만 순간적으로 집중되는 것이 아니므로 제품전체의 강도가 높아지는 효과는 있으나 특히 표면이 다른 부분보다 강도가 높아지고 매끈해지는 효과는 없을 뿐 아니라 반복되는 가압과 해압은 에너지 소모가 많고 생산성이 떨어지는 문제도 있는 것이었다.In addition, the press and release pressure may be repeated to increase the strength of the product. However, this molding method also increases the strength of the whole product because the pressurization pressure is not concentrated on the surface instantaneously. Not only does it have a higher and smoother effect, but repeated pressurization and depressurization are energy consuming and low productivity.

본 발명은 이러한 문제점을 해결하기 위하여 가압후 프레스판의 후진직전에 1초내외의 짧은 시간에 순간적으로 한번 더 보다 높은 압력으로 눌러 준후 후진하므로서 강한 압력이 순간적으로 제품의 표면에만 집중되어 성형된 제품의 표면이 매끈하고 강도가 높도록한 것으로서 이를 실시예에 따라 상세히 설명하면 다음과 같다.In order to solve this problem, the pressurized product is pressurized to a higher pressure in a short time of about 1 second immediately before and after reversing the press plate. The surface of the smooth and high strength as described in detail according to the embodiment as follows.

[실시예]EXAMPLE

일정온도를 가열용해된 합성수지를 프레스기(가)의 하부 성형틀에 넣고 승강판(1)을 상승시켜 가압하여 물품을 성형함에 있어 프레스기(가)의 유압실린더(2)에 의하여 상승한 승강판(1)이 상하부 성형틀(3)(4)을 통상의 방법으로 가압하여 물품을 성형하되 약 250kg의 압력으로 30-60초간 가압하여 물품이 성형되게 하고 승강판(1)의 후진직전에 약 300kg의 압력으로 1초정도 짧은 시간내에 순간적으로 다시 한번더 가압하고 승강판(1)을 후진 시킨후 탈형하여 제조하는 성형방법인 것이다.The elevating plate (1) raised by the hydraulic cylinder (2) of the press machine (A) in forming a product by heating the melted synthetic resin into a lower forming mold of the press machine (A) by raising and elevating the elevating plate (1). ) Presses the upper and lower forming molds (3) and (4) in a conventional manner to mold the article, but presses for 30 to 60 seconds at a pressure of about 250 kg to form the article and about 300 kg of the lifting plate 1 immediately before reversing. It is a molding method that pressurizes again once more momentarily within a short time of about 1 second by pressure, reverses the elevating plate 1, and then demolds it.

이와 같이 성형하여 제조한 물품은 정상가압후 보다 높은 압력으로 짧은 시간에 재가압하여 주므로서 높은 압력이 제품의 표면에 순간적으로 집중되어 표면강도가 높아지고 매끈 해지므로 상품가치가 매우 높아지는 효과가 있는 것이다.The article manufactured by molding is re-pressurized in a short time at a higher pressure than after normal pressurization, so that the high pressure is momentarily concentrated on the surface of the product, so that the surface strength becomes smooth and the product value is very high. .

Claims (1)

프레스기(가)로 합성수지 제품을 가압성형함에 있어 승강판(1)이 상하 성형틀(3)(4)을 가압성형하고 후진직전에 보다 높은 압력으로 짧은 시간 한번 더 가압하여 성형하는 프레스기에 의한 합성수지 제품의 성형방법.In press molding synthetic resin products with a press machine (A), the lifting plate (1) press-forms the upper and lower forming molds (3) and (4), and presses and presses the molding machine with a higher pressure once more for a short time immediately before reversing Forming method of the product.
KR1019890017391A 1989-11-27 1989-11-27 Forming method for synthetic resin articles by press KR920001604B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019890017391A KR920001604B1 (en) 1989-11-27 1989-11-27 Forming method for synthetic resin articles by press

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019890017391A KR920001604B1 (en) 1989-11-27 1989-11-27 Forming method for synthetic resin articles by press

Publications (2)

Publication Number Publication Date
KR910009408A KR910009408A (en) 1991-06-28
KR920001604B1 true KR920001604B1 (en) 1992-02-20

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Application Number Title Priority Date Filing Date
KR1019890017391A KR920001604B1 (en) 1989-11-27 1989-11-27 Forming method for synthetic resin articles by press

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KR910009408A (en) 1991-06-28

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