KR20010037061A - Manufacturing method of structural bumper using gas injection molding and its structural bumper - Google Patents

Manufacturing method of structural bumper using gas injection molding and its structural bumper Download PDF

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Publication number
KR20010037061A
KR20010037061A KR1019990044352A KR19990044352A KR20010037061A KR 20010037061 A KR20010037061 A KR 20010037061A KR 1019990044352 A KR1019990044352 A KR 1019990044352A KR 19990044352 A KR19990044352 A KR 19990044352A KR 20010037061 A KR20010037061 A KR 20010037061A
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KR
South Korea
Prior art keywords
bumper
injection
gas
manufacturing
injection molding
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KR1019990044352A
Other languages
Korean (ko)
Inventor
김석환
Original Assignee
이계안
현대자동차 주식회사
류정열
기아자동차 주식회사
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Application filed by 이계안, 현대자동차 주식회사, 류정열, 기아자동차 주식회사 filed Critical 이계안
Priority to KR1019990044352A priority Critical patent/KR20010037061A/en
Priority to AU65505/99A priority patent/AU6550599A/en
Priority to DE1999163896 priority patent/DE19963896A1/en
Publication of KR20010037061A publication Critical patent/KR20010037061A/en

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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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/174—Applying a pressurised fluid to the outer surface of the injected material inside the mould cavity, e.g. for preventing shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • 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
    • 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
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76551—Time
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76775—Fluids
    • B29C2945/76779—Fluids auxiliary fluids introduced into the cavity
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • 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
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3044—Bumpers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/186—Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material
    • B60R2019/188—Blow molded structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/1886—Bumper fascias and fastening means therefor

Landscapes

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

Abstract

PURPOSE: A bumper manufacturing method using a gas injecting injection molding and a bumper thereof completely removes the generation of sink mark according to the forming of a reinforcing rib. CONSTITUTION: First resin goods including many reinforcing ribs(10) are formed by injection molding by using high rigidity polypropylene material. Then, after a predetermined time passed, nitrogen gas is injected through a gas channel(20) formed on the extended portion of the ribs(10) to form a final resin good of the integral part of fascia by injection molding. Therefore, by a bumper fascia provided by a gas injecting injection molding, the vehicle is lightened and the cost of the vehicle is reduced.

Description

가스주입 사출 공법을 이용한 범퍼 제조방법 및 그 범퍼{Manufacturing method of structural bumper using gas injection molding and its structural bumper}Manufacturing method of structural bumper using gas injection molding and its structural bumper

본 발명은 가스주입 사출 공법을 이용하여 차량용 범퍼를 제조하는 방법과 이때 제조되는 범퍼에 관한 것으로서, 더욱 상세하게는 가스 채널을 형성하는 방법을 채용한 가스주입 사출 공법으로 제품 표면에 싱크 마크가 생기는 문제를 해결하면서 다수의 보강 리브를 갖춘 페시아 단일 부품의 범퍼를 제조할 수 있는 방법 및 이때의 제조방법에 따른 범퍼를 제공함으로써, EA 폼이나 레인포스먼트 없이 각종 규제를 만족할 뿐만 아니라 그 기능성을 한층 향상시킬 수 있도록 한 범퍼 및 그 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a bumper for a vehicle using a gas injection injection method and to a bumper manufactured at this time, more specifically, a sink mark is formed on the surface of the product by a gas injection injection method employing a method of forming a gas channel. By solving the problem and providing a method for manufacturing a single fascia bumper with a plurality of reinforcing ribs and a bumper according to the manufacturing method at this time, it not only satisfies various regulations without EA foam or reinforcement, but also its functionality is further enhanced. The present invention relates to a bumper and a method of manufacturing the same.

일반적으로 차량의 기존 범퍼 시스템은 표피재인 페시아(Fascia)와, EA(Energy Absorption) 폼과, 보강재인 레인포스먼트(Reinforcement)의 3중 구조로 이루어져 있다.In general, the existing bumper system of the vehicle is composed of a three-layer structure of Fascia (Envelope), Energy Absorption (EA) foam, and Reinforcement (reinforcement).

범퍼의 페시아로 사용되고 있는 재료로는 주로 PP(Polypropylene) 재료, RIM(Reaction Injection molding) 재료 등이 있으며, 2.5/5mph용 공용으로 사용되고 있다.The materials used for the bumper fascia are mainly polypropylene (PP) materials and reaction injection molding (RIM) materials, and are commonly used for 2.5 / 5 mph.

에너지 흡수재인 EA 폼은 발포 PP(EPP) 재료를 사용하는데 주로 2.5mph용은 15배 발포, 5mph용은 30배 발포된 EPP(Expanded PP) 재료를 사용하고 있다.EA foam, which is an energy absorber, uses expanded PP (EPP) materials, mainly 15 times for 2.5 mph and 30 times for 5 mph.

또한, 보강재인 레인포스먼트는 스틸 재료, 알루미늄 재료, GMT(Glass Mat Thermoplastic) 재료 등을 사용하여 제작된다.In addition, the reinforcement reinforcement is manufactured using a steel material, aluminum material, glass mat thermoplastic (GMT) material and the like.

기존의 범퍼 시스템을 보면 크게 페시아와 EA 폼 그리고 레인포스먼트 3가지 파트로 별도 구성되어 중량이 무겁고 전체적인 비용이 높으며 각 파트의 원재료가 달라 차량 분해 해체시 작업성 낮다는 단점이 있다.Existing bumper system is composed of three parts such as fascia, EA foam, and reinforcement, which is heavy in weight, high in overall cost, and low in workability when dismantling the vehicle due to different raw materials of each part.

즉, 범퍼 표피재인 페시아는 2.5/5mph용 공용으로 사용되고, EA 폼의 발포율을 각각 2.5mph용은 15배, 5mph용은 30배로 별도 조정하여 사용되며, 레인포스먼트는 구조를 다소 변경하여 2.5mph용, 5mph용으로 각각 구별하여 사용되므로 2.5mph용과 5mph용을 별도로 제품 개발해야 하는 문제점이 있다.In other words, Pescia, a bumper skin material, is commonly used for 2.5 / 5 mph, and the foaming rate of EA foam is separately adjusted to 15 times for 2.5 mph and 30 times for 5 mph, respectively. Since it is used separately for mph and 5 mph, there is a problem in that the product must be developed separately for 2.5 mph and 5 mph.

따라서, 본 발명은 이와 같은 점을 감안하여 안출한 것으로서, 차량의 범퍼 시스템을 기존 3가지 파트의 여러 재료에서 페시아 단일 부품의 한가지 재료로 개선하면서 각종 규제에 만족할 수 있는 에너지 흡수수단으로서 충돌시 강성 유지용 보강 리브를 채용하고, 특히 가스 채널을 형성시키는 방법의 가스주입 사출 공법을 이용하여 보강용 리브 형성에 따른 싱크 마크(Sink mark)의 생성을 완전히 배제하며, 또한 차량 폐차시 페시아 단일 부품에 따른 용이한 해체와 환경 친화성을 도모할 수 있도록 한 가스주입 사출 공법을 이용한 범퍼 제조방법 및 그 범퍼를 제공하는데 그 안출의 목적이 있는 것이다.Accordingly, the present invention has been made in view of the above-mentioned problems, and improves the bumper system of a vehicle from several materials of three parts to one material of a single piece of facia, and is capable of satisfying various regulations while providing rigidity in collision. Adopting the maintenance reinforcement ribs, in particular the gas injection injection method of the method of forming the gas channel completely excludes the generation of the sink mark due to the formation of the reinforcement ribs, and also to the Pescia single part It is an object of the present invention to provide a bumper manufacturing method and a bumper manufacturing method using a gas injection injection method to facilitate easy disassembly and environmental friendliness.

도 1은 본 발명에 따른 범퍼의 단면구조를 보여주는 개략적인 사시도1 is a schematic perspective view showing a cross-sectional structure of a bumper according to the present invention

〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

10 : 리브 20 : 가스 채널10: rib 20: gas channel

이하, 첨부한 도면을 참조하여 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 고강성 PP재를 사용하여 다수의 보강용 리브를 포함하는 1차 수지 제품을 사출한 다음, 일정시간 경과 후 수직 리브의 연장부에 있는 가스 채널을 통해 질소 가스를 주입하여 페시아 단일 부품의 최종 수지 제품을 사출하는 것을 특징으로 한다.The present invention uses a high-rigidity PP material to inject a primary resin product including a plurality of reinforcing ribs, and then injects nitrogen gas through a gas channel in an extension of the vertical ribs after a certain period of time. It characterized in that the injection of the final resin product.

특히, 프론트 범퍼 수지 제품 사출시의 온도조건은 200∼220℃이고, 압력조건은 4Mpa∼6Mpa이며, 1차 수지 제품 사출 후 질소 가스를 주입하기 위한 지연시간은 17.5∼19.5초인 것을 특징으로 한다.In particular, the temperature conditions for injection of the front bumper resin products are 200 to 220 ° C., the pressure conditions are 4 Mpa to 6 Mpa, and a delay time for injecting nitrogen gas after injection of the first resin product is 17.5 to 19.5 seconds.

또한, 리어 범퍼 수지 제품 사출시의 온도조건은 220∼240℃이고, 압력조건은 5Mpa∼7Mpa이며, 1차 수지 제품 사출 후 질소 가스를 주입하기 위한 지연시간은 13.5∼16.5초인 것을 특징으로 한다.In addition, the temperature conditions at the time of injection of the rear bumper resin product are 220-240 degreeC, the pressure conditions are 5Mpa-7Mpa, and the delay time for injecting nitrogen gas after primary resin product injection is 13.5-16.5 second.

또한, 본 발명은 내측에 범퍼 길이방향으로 따라 나란한 다수의 보강용 리브(10)를 갖고 있으며, 상기 리브(10)의 연장부위에 있는 가스 채널(20)을 통해 질소 가스를 주입하여 싱크 마크가 생기지 않도록 하는 가스주입 사출 공법에 의해 제조되는 고강성 PP재 페시아 단일 부품으로 이루어진 것을 특징으로 한다.In addition, the present invention has a plurality of reinforcing ribs (10) side by side in the bumper longitudinal direction on the inside, and the sink mark is injected by injecting nitrogen gas through the gas channel 20 in the extension of the rib (10) It is characterized by consisting of a single piece of high rigidity PP material Facia produced by a gas injection injection method that does not occur.

특히, 상기 리브(10)는 두께 3∼5㎜로 적어도 3개가 구비되는 것을 특징으로 한다.In particular, the rib 10 is characterized in that at least three are provided with a thickness of 3 to 5mm.

본 발명에 따른 가스주입 사출 공법을 이용한 범퍼 제조방법을 좀더 상세히 설명하면 다음과 같다.Referring to the bumper manufacturing method using the gas injection method according to the present invention in more detail.

가스주입 사출 성형이란 일정량의 수지를 주입한 후 질소 가스를 주입하여 성형하는 공법으로서, 본 발명에서는 이러한 공법을 이용하여 EA 폼이나 레인포스먼트를 제거하고 범퍼 페시아만의 자체로 2.5mph 규제를 만족할 수 있는 범퍼 및 그 제조방법을 제공하도록 한 것이다.Gas injection injection molding is a method of injecting nitrogen gas after molding a certain amount of resin, and in the present invention, this method is used to remove EA foam or reinforcement and to satisfy the 2.5mph regulation by bumper pescia alone. It is to provide a bumper and a method of manufacturing the same.

페시아 자체만으로는 각종 규제(2.5/5mph 등)를 만족하기 힘들 뿐더러 이를 만족하기 위해서는 제품의 두께가 두꺼워지고, 충격을 보강하기 위해 형성하는 배면부위의 리브들에 의해 범퍼 전면에 심한 싱크 마크가 생기게 되므로 기존의 사출 공법으로는 제품의 상품성 및 그 가치가 떨어진다.The fascia itself is difficult to satisfy various regulations (2.5 / 5 mph, etc.), and in order to satisfy this problem, the thickness of the product becomes thicker, and a severe sink mark is formed on the front of the bumper by ribs on the rear part formed to reinforce the impact. Existing injection methods reduce the merchandise and value of the product.

페시아만으로 충격을 견디면서 최소한의 무게로 충격을 견디기 위해서는 범퍼 배면에 두꺼운 리브를 보강해주어야 하는데, 일반 사출 공법을 이용하면 이 보강용 리브로 인하여 제품 표면에 심한 싱크 마크(굴곡자국)가 생기게 되므로 본 발명에서는 리브의 연장부위, 즉 리브와 페시아가 만나는 곳에 가스 채널을 형성시켜 표면의 싱크 마크를 없앨 수 있게 하는 가스주입 사출 공법을 채용하였다.In order to withstand the impact with minimum weight while enduring the impact with only Pescia, a thick rib must be reinforced on the rear surface of the bumper. The gas injection injection method is adopted to remove the sink marks on the surface by forming a gas channel where the ribs, ie, the ribs and the fascia, meet.

제품의 리브 형태는 충돌시 강성 유지를 위해 수직 리브로 보강하는 구조(Structural fascia)로 함으로써, 초기 충돌시 스트럭츄얼 페시아가 변형되면서 에너지를 흡수하게 되고, 페시아의 양 끝부분에 스테이를 일체 형성하여 차체에 장착할 수 있게 하면서 충돌 도중에 에너지를 흡수하도록 하였다.The rib shape of the product is a structural fascia reinforced with vertical ribs to maintain rigidity in the collision, so that the structural fascia is deformed during the initial collision to absorb energy, and the stays are integrally formed at both ends of the fascia. It could be mounted on the body while absorbing energy during the crash.

또한, 기존의 범퍼 시스템에서는 페시아＋EA 폼＋레인포스먼트로 이루어지던 시스템에서 단지 범퍼 페시아만으로 기존 2.5mph 규제를 만족하기 위해서는 여러 재료가 사용가능하나 본 발명에서는 재활용이 가능한 열가소성 수지인 TPO(PP) 재료를 사용하였다.In addition, in the conventional bumper system, various materials may be used to satisfy the existing 2.5 mph regulation with only bumper fascia in the system consisting of fascia + EA foam + reinforcement, but in the present invention, TPO (PP), which is a recyclable thermoplastic resin, may be used. Material was used.

페시아만으로 기존 범퍼 시스템의 규격을 만족시키기 위한 재료 특성으로는 재료강도, 내열성, 충격강도 등 모든 물성이 중요하지만 그 중에서도 가장 중요한 재료물성이 굴곡강도 및 굴곡탄성율이라 할 수 있다.The material properties to satisfy the specifications of the existing bumper system with only Pescia are all physical properties such as material strength, heat resistance and impact strength, but the most important material properties are flexural strength and flexural modulus.

기존 2.5/5mph 공용 범퍼 구조에 사용되는 재료는 보강재가 뒷부분에 있으므로 부드러운 타입 PP 재료로서 굴곡탄성율 값이 6,000㎏/㎠ 정도면 만족할 수 있으나, 페시아 하나 만으로 기존 범퍼 구조를 만족시키기 위해서는 다소 딱딱한 타입의 PP 재료 특성이 요구되므로 굴곡 탄성율 값이 약 10,000㎏/㎠ 내외 값을 가져야만 최적의 제품 구조로 규격을 만족할 수 있다.The material used for the existing 2.5 / 5mph common bumper structure is a soft type PP material, which can satisfy the flexural modulus of about 6,000㎏ / ㎠, but it is a rather hard type to satisfy the existing bumper structure with only one fascia. Because PP material properties are required, the flexural modulus value should be about 10,000㎏ / ㎠ to satisfy the optimum product structure.

아래의 표 1은 본 발명에 따른 범퍼 제조방법에 의해 제조된 범퍼 페시아와 기존 범퍼 커버의 재료별 물성 평가 결과를 비교한 것이다.Table 1 below compares the results of evaluation of the physical properties of the bumper fascia manufactured by the bumper manufacturing method according to the present invention and the existing bumper cover.

이와 같은 재료 특성을 가지고 있는 제품을 성형하는 조건은 다음과 같다.The conditions for molding a product having such material properties are as follows.

가스주입 사출 공법으로 범퍼 페시아 리브 구조를 성형할 때 싱크 마크를 최소화시키기 위해 제품의 최적 성형조건을 CAE 해석과 성형 시행착오를 통해 수지 사출 온도조건과 질소 가스 주입조건을 세팅하여 최적의 제품을 제작하였다.In order to minimize the sink marks when forming the bumper fascia rib structure by the gas injection method, the optimum molding condition of the product is produced by setting the resin injection temperature condition and nitrogen gas injection condition through CAE analysis and molding trial and error. It was.

그 중에서도 제품 사출 성형시 플라스틱 수지 사출 후 가스를 주입하는 지연시간이 매우 중요하며, 그 조건은 다음과 같다.Among them, the delay time of injecting gas after plastic resin injection during product injection molding is very important, and the conditions are as follows.

본 발명에서 프론트 범퍼는 사출 온도 200∼220℃, 바람직하게는 210℃, 압력 4Mpa∼6Mpa, 바람직하게는 5Mpa, 수지 사출 후 가스를 주입하는 시점인 지연시간 17.5∼19.5초, 바람직하게는 18.5초의 조건일 때 가스의 터짐이 최소화 되었고 수지 충전상태가 가장 양호하였다.In the present invention, the front bumper has an injection temperature of 200 to 220 ° C., preferably 210 ° C., a pressure of 4 Mpa to 6 Mpa, preferably 5 Mpa, and a delay time of 17.5 to 19.5 seconds, preferably 18.5 seconds, which is a point of injection of gas after resin injection. Under these conditions, the bursting of gas was minimized and the resin filled was the best.

또한, 리어 범퍼는 구조가 다르므로 사출 온도 220∼240℃, 바람직하게는 230℃, 압력 5Mpa∼7Mpa, 바람직하게는 6.2Mpa, 지연시간 13.5∼16.5초, 바람직하게는 14.5∼15.8초의 조건일 때 가스의 터짐이 최소화 되었고 수지 충전상태가 가장 양호하였다.In addition, since the rear bumper has a different structure, when the injection temperature is 220 to 240 ° C, preferably 230 ° C, pressure 5Mpa to 7Mpa, preferably 6.2Mpa, delay time 13.5 to 16.5 seconds, preferably 14.5 to 15.8 seconds. The bursting of gas was minimized and the resin filled was the best.

따라서, 적절한 굴곡 탄성율을 가진 재료를 사용하고 최적의 가스주입 사출 공법을 사용함으로써 EA 폼 및 레인포스먼트를 없애고도 범퍼 표피재인 페이스만으로 2.5mph 충돌 규제성능을 만족할 수 있는 구조의 범퍼를 제공할 수 있다.Therefore, by using a material with an appropriate flexural modulus and using an optimal gas injection injection method, it is possible to provide a bumper structure that satisfies the 2.5 mph impact regulation performance by removing the EA foam and reinforcement and using only the bumper skin face. have.

이와 같이 제조되는 본 발명에 따른 범퍼, 즉 범퍼 페시아는 첨부한 도 1에서도 볼 수 있는 바와 같이 페시아 배면에 길이방향으로 따라 나란한 다수의 리브(10)를 갖추고 있으며, 리브(10)와 페시아가 만나는 부위에 형성한 가스 채널(20)을 이용한 가스주입을 통해 페시아 표면의 싱크 마크 형성이 완전히 배제될 수 있는 것이다.As described above, the bumper, ie, bumper fascia according to the present invention has a plurality of ribs 10 arranged side by side in the longitudinal direction on the back of the fascia, as shown in FIG. 1, wherein the ribs 10 and the fascia meet. Through the gas injection using the gas channel 20 formed in the site, the formation of the sink mark on the surface of the fascia may be completely excluded.

이와 같이 1차 수지를 사출 후 적정시간, 예를 들면 약 15초 정도의 시간 경과 후 2차 가스 사출하는 가스주입 사출 공법으로 범퍼 페시아만으로 된 단일 부품을 제조함으로써, 기존 범퍼 시스템 대비 약 40％ 이상의 경량화 및 약 10％ 이상의 원가절감에 기여할 수 있게 된다.As such, a single part made of only a bumper pescia is manufactured by a gas injection injection method in which a secondary gas is injected after an appropriate time, for example, about 15 seconds after injection of the primary resin, thereby providing about 40% or more of the existing bumper system. It can contribute to weight reduction and cost reduction of about 10% or more.

즉, 페시아, EA 폼, 레인포스먼트의 3중 구조로 이루어진 기존 범퍼 시스템 부품과 본 발명에 따른 범퍼 페시아만의 가스주입 사출 공법을 비교 하였을 때 조립 부품 감소와 공수절감으로 중량은 대당 8㎏ 이상 저감되고, 부품 원가는 대당 1만원 이상 저감되는 효과를 기대할 수 있다.That is, when comparing the existing bumper system parts consisting of the triple structure of the fascia, EA foam, and reinforcement with the gas injection injection method of the bumper pescia only according to the present invention, the weight is greater than 8 kg per unit due to the reduction of the assembly parts and the labor saving. It can be reduced, and the cost of parts can be expected to be reduced by more than 10,000 won per unit.

또한, 기존 3중 구조의 부품을 하나의 부품으로 개발하여 조립 공수절감에 의한 공정 단순화에 기여했고, 리사이클링이 가능한 열가소성 PP 재료 사용과 차량 폐차시 단일 부품으로 해체가 용이하기 때문에 환경 친화성 제품이라는데 큰 효과를 볼 수 있다.In addition, by developing the parts of the existing triple structure into one part, it contributed to the simplification of the process by reducing the assembly labor, and it is an environmentally friendly product because it is easy to disassemble as a single part when using the recycled thermoplastic PP material and when the vehicle is discarded. You can see a big effect.

이상과 같이 본 발명은 가스주입 사출 공법을 이용하여 제조한 범퍼 페시아를 제공함으로써, 차량 경량화 및 비용절감의 효과를 도모할 수 있는 장점이 있다.As described above, the present invention provides the bumper fascia manufactured by using the gas injection injection method, and thus, there is an advantage that the weight reduction and cost reduction of the vehicle can be achieved.

Claims (5)

고강성 PP재를 사용하여 다수의 보강용 리브를 포함하는 1차 수지 제품을 사출한 다음, 일정시간 경과 후 수직 리브의 연장부에 있는 가스 채널을 통해 질소 가스를 주입하여 페시아 단일 부품의 최종 수지 제품을 사출하는 것을 특징으로 하는 가스주입 사출 공법을 이용한 범퍼 제조방법.The high-rigidity PP material is used to inject a primary resin product containing a number of reinforcing ribs, and then, after a certain period of time, injects nitrogen gas through a gas channel in the extension of the vertical ribs so that the final resin of the facia single part Bumper manufacturing method using a gas injection injection method, characterized in that for injecting the product. 제 1 항에 있어서, 프론트 범퍼 수지 제품 사출시의 온도조건은 200∼220℃이고, 압력조건은 4Mpa∼6Mpa이며, 1차 수지 제품 사출 후 질소 가스를 주입하기 위한 지연시간은 17.5∼19.5초인 것을 특징으로 하는 가스주입 사출 공법을 이용한 범퍼 제조방법.The method of claim 1, wherein the temperature during injection of the front bumper resin product is 200-220 ° C, the pressure condition is 4Mpa-6Mpa, and the delay time for injecting nitrogen gas after injection of the primary resin product is 17.5-19.5 seconds. Bumper manufacturing method using a gas injection injection method characterized in that. 제 1 항에 있어서, 리어 범퍼 수지 제품 사출시의 온도조건은 220∼240℃이고, 압력조건은 5Mpa∼7Mpa이며, 1차 수지 제품 사출 후 질소 가스를 주입하기 위한 지연시간은 13.5∼16.5초인 것을 특징으로 하는 가스주입 사출 공법을 이용한 범퍼 제조방법.The method of claim 1, wherein the temperature of the injection of the rear bumper resin product is 220 to 240 ℃, the pressure is 5Mpa to 7Mpa, the delay time for injecting nitrogen gas after injection of the first resin product is 13.5 ~ 16.5 seconds Bumper manufacturing method using a gas injection injection method characterized in that. 내측에 범퍼 길이방향으로 따라 나란한 다수의 보강용 리브(10)를 갖고 있으며, 상기 리브(10)의 연장부위에 있는 가스 채널(20)을 통해 질소 가스를 주입하여 싱크 마크가 생기지 않도록 하는 가스주입 사출 공법에 의해 제조되는 고강성 PP재 페시아 단일 부품으로 이루어진 것을 특징으로 하는 범퍼.It has a plurality of reinforcing ribs (10) side by side in the bumper longitudinal direction on the inside, and the gas injection to inject nitrogen gas through the gas channel 20 in the extension portion of the rib 10 so as to prevent the formation of a sink mark A bumper, characterized in that it consists of a single piece of high-stiffness PP material Fascia manufactured by an injection method. 제 4 항에 있어서, 상기 리브(10)는 두께 3∼5㎜로 적어도 3개가 구비되는 것을 특징으로 하는 범퍼.5. The bumper according to claim 4, wherein at least three ribs (10) are provided with a thickness of 3 to 5 mm.
KR1019990044352A 1999-10-13 1999-10-13 Manufacturing method of structural bumper using gas injection molding and its structural bumper KR20010037061A (en)

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AU65505/99A AU6550599A (en) 1999-10-13 1999-12-24 Manufacturing method of structural bumper using gas injection molding and its structural bumper
DE1999163896 DE19963896A1 (en) 1999-10-13 1999-12-30 Technique making vehicle bumper front panel reinforced by rear ribs, involves injection molding followed by removal of molding and then injection of gas into T-intersections between ribs and panel, forming longitudinal void

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