KR100357977B1 - Auto transmission - Google Patents

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Publication number
KR100357977B1
KR100357977B1 KR1020000022081A KR20000022081A KR100357977B1 KR 100357977 B1 KR100357977 B1 KR 100357977B1 KR 1020000022081 A KR1020000022081 A KR 1020000022081A KR 20000022081 A KR20000022081 A KR 20000022081A KR 100357977 B1 KR100357977 B1 KR 100357977B1
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South Korea
Prior art keywords
annealing
plastic deformation
core
forming
punching
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KR1020000022081A
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Korean (ko)
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KR20010025151A (en
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신태중
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주식회사 코우
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/50—Other automobile vehicle parts, i.e. manufactured in assembly lines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

본발명은 자동차용 오토 트랜스미션의 솔레노이드밸브에 관한 것으로 특히, 롤소재를 커팅과정,1차 소성과정,2차 소성과정,소둔과정,쇼트과정,피막과정,성형과정을 거침으로서 전기적 힘에 의해 오일 공급 방향을 결정해 주는 솔레노이드밸브에 결합되어 스프링을 지지하는 코어를 성형할 수 있도록된 것으로 별도의 열처리 과정이 없이 단조 자체의 강도로 강성을 유지하는 견고한 코어를 얻을 수 있고 향상된 생산성을 얻을 수 있으며 가격 경쟁력을 향상시킬 수 있는 자동차 오토트랜스미션용 솔레노이드밸브의 코어성형방법을 제공한다.The present invention relates to a solenoid valve of an auto transmission for an automobile, and in particular, the roll material is cut through the first step, the first firing step, the second firing step, the annealing step, the short step, the coating step, and the molding step. It is combined with the solenoid valve that determines the supply direction, so that the core supporting the spring can be formed. A solid core that maintains rigidity with the strength of the forging itself can be obtained without additional heat treatment process, and improved productivity can be obtained. Provides core forming method of solenoid valve for automobile auto transmission which can improve price competitiveness.

Description

자동차오토트랜스미션용 솔레노이드밸브의 코어성형방법{AUTO TRANSMISSION}Core forming method of solenoid valve for automobile auto transmission {AUTO TRANSMISSION}

본발명은 자동차용 오토 트랜스미션의 솔레노이드밸브에 관한 것으로 특히, 롤소재를 커팅과정,1차 소성과정,2차 소성과정,소둔과정,쇼트과정,피막과정,성형과정을 거침으로서 전기적 힘에 의해 오일 공급 방향을 결정해 주는 솔레노이드밸브에 결합되어 스프링을 지지하는 코어를 성형할 수 있도록된 것으로 별도의 열처리 과정이 없이 단조 자체의 강도로 강성을 유지하는 견고한 코어를 얻을 수 있고 향상된 생산성을 얻을 수 있으며 가격 경쟁력을 향상시킬수 있는 자동차 오토트랜스미션용 솔레노이드밸브의 코어성형방법에 관한 것이다.The present invention relates to a solenoid valve of an auto transmission for an automobile, and in particular, the roll material is cut through the first step, the first firing step, the second firing step, the annealing step, the short step, the coating step, and the molding step. It is combined with the solenoid valve that determines the supply direction, so that the core supporting the spring can be formed. A solid core that maintains rigidity with the strength of the forging itself can be obtained without additional heat treatment, and the productivity can be improved. The present invention relates to a core forming method of a solenoid valve for automobile auto transmission that can improve price competitiveness.

종래 자동차의 오토 트랜스미션에 장착되는 솔레노이드밸브(1)는 도1에 나타내었다.A solenoid valve 1 mounted in an auto transmission of a conventional vehicle is shown in FIG.

즉, 상기 솔레노이드밸브(1)는 전기적인 힘에 의해 플런저(3)를 이동시켜가며 오일의 공급 방향을 결정해 주는 밸브이다.That is, the solenoid valve 1 is a valve that moves the plunger 3 by the electric force and determines the oil supply direction.

상기의 솔레노이드 밸브(1)에는 코일(5)을 권취하고 있는 보빈(4) 외곽으로 코어(10)가 결합되도록 되어 있다.The core 10 is coupled to the solenoid valve 1 outside the bobbin 4 in which the coil 5 is wound.

그리고, 상기 코어(10)는 플런저(3)에 탄력을 부여하기 위한 스프링(2)을 받쳐주는 중요한 역할을 하게 된다.In addition, the core 10 plays an important role of supporting the spring 2 for giving elasticity to the plunger 3.

그러나, 종래의 코어(10)는 여러과정의 선반작업과 드릴링 작업등의 절삭가공에 의해 제작을 하였고 열처리가 필수적이기 때문에 대량생산이 불가능하게 된다.However, the conventional core 10 is manufactured by a cutting process such as a lathe work and a drilling work of various processes, and mass production is impossible because heat treatment is essential.

또한, 상기의 코어(10)는 정확한 칫수로 제작되어야 보빈(4)에 조립이 가능하기 때문에 정밀도를 맞추기가 어려워 불량률이 높아지게 되는 문제점을 가지고 있었다,In addition, since the core 10 can be assembled to the bobbin 4 only when manufactured with the correct dimensions, it is difficult to match the precision, and thus the defect rate is increased.

따라서, 상기의 정밀도를 맞춰서 불량률을 떨어트리기 위해서는 고임금의 숙련공이 필요하게 되므로 자연적으로 코어(10)의 제작단가가 높아지게 되어 가격 경쟁력을 갖출 수 없는 문제점을 가지고 있었다.Therefore, in order to reduce the defective rate in accordance with the above precision, high-skilled skilled workers are required, which naturally increases the manufacturing cost of the core 10 and has a problem that price competitiveness cannot be achieved.

이러한 종래의 문제점등을 해결 보완하기 위한 본발명의 목적은,The purpose of the present invention for solving and solving these conventional problems,

별도의 열처리 과정이 없이 단조 자체의 강도로 강성을 유지하는 견고한 코어를 얻을 수 있고 향상된 생산성을 얻을 수 있으며 가격 경쟁력을 향상시킬수 있도록 하는 목적을 제공한다.Without the additional heat treatment process, it is possible to obtain a solid core that maintains rigidity by the strength of the forging itself, to obtain improved productivity, and to improve the price competitiveness.

상기의 목적을 달성하기 위하여 본발명은,In order to achieve the above object, the present invention,

롤소재를 커팅과정,1차 소성과정,2차 소성과정,소둔과정,쇼트과정,피막과정,성형과정을 거침으로서 전기적 힘에 의해 오일 공급 방향을 결정해 주는 솔레노이드밸브에 결합되어 스프링을 지지하는 코어를 성형할 수 있도록 하면 본발명의 목적을 달성할 수 있게 된다.Roll material is cut, primary firing process, secondary firing process, annealing process, short process, coating process, forming process, and is connected to solenoid valve which determines oil supply direction by electric force to support spring. Being able to mold the core makes it possible to achieve the object of the present invention.

도1은 본발명의 코어가 장착되는 오토 트랜스미션의 솔레노이드밸브를 나타낸 단면도1 is a cross-sectional view showing a solenoid valve of an auto transmission equipped with a core of the present invention.

도2는 본발명 코어의 성형과정을 나타낸 플루우챠트Figure 2 is a flow chart showing the molding process of the present invention core

도3은 본발명 코어의 성형과정중 제1실시예에 의한 단계를 나타낸 플루우챠트Figure 3 is a flow chart showing the steps according to the first embodiment of the molding process of the present invention

도4는 본발명 코어의 성형과정중 제2실시예에 의한 단계를 나타낸 플루우챠트Figure 4 is a flow chart showing the steps according to the second embodiment of the molding process of the present invention

<도면중 중요 부분에 대한 부호설명><Description of Signs of Important Parts in Drawing>

101-소재 102-홀101-material 102-hole

103-내경형상 104-통공103-inner 104-hole

본발명 솔래노이드밸브의 코어 성형방법을 도2의 플루우챠트에 의해 상세히 설명하기로 한다.The core shaping method of the solenoid valve of the present invention will be described in detail by the flow chart of FIG.

완제품의 체적을 구하여 감겨있는 롤소재(101)를 필요한 길이 만큼 커팅하는 커팅과정과,The cutting process of cutting the roll material 101 wound to the required length by obtaining the volume of the finished product,

상기 커팅과정에 의해 불규칙하게 되어 있는 소재(101) 절단면의 평면을 평활하게 하여 주기 위해 펀치로 가압하여 소성변형시키는 1차 소성변형과정과,Primary plastic deformation process for plastic deformation by pressing with a punch to smooth the plane of the cut surface of the material 101 is irregular by the cutting process,

상기 1차 소성변형과정을 거친 소재(101)의 좌,우형상이 동일하도록 펀치로 가압하여 소성변형시키는 2차 소성변형과정과,A secondary plastic deformation process of plastic deformation by pressing with a punch such that the left and right shapes of the material 101 which have undergone the first plastic deformation process are the same;

상기 2차 소성변형과정을 거친 소재(101)를 소둔(어닐링)작업에 의해 강도를 약화시켜 단조작업이 용이토록 하기 위한 소둔과정과,An annealing process for reducing the strength by annealing (annealing) the material 101 subjected to the secondary plastic deformation process to facilitate forging work,

상기 소둔과정을 거친 소재(101)의 표면에 발생된 스케일을 제거하기 위한 쇼트과정과,Short process for removing the scale generated on the surface of the material 101 subjected to the annealing process,

상기 쇼트과정을 거친 소재(101)의 표면 마찰계수를 줄여 단조를 용이토록 하기 위해 아연계 인산염피막을 한후 소재(101)표면에 윤활제를 도포하는 피막과정과,A coating process of applying a lubricant to the surface of the material 101 after applying a zinc-based phosphate coating to reduce the surface friction coefficient of the material 101 which has undergone the short process to facilitate forging;

상기 피막과정을 거친 소재를 완제품인 코어(10)로 성형하는 성형과정으로 이루어진 것이다.It is made of a molding process for molding the material subjected to the coating process into a core 10 which is a finished product.

그리고, 상기 성형과정은 도3의 플루우챠트에 나타낸 바와같이 피막과정에서 피막완료된 소재(101)를 냉간다단성형기의 다이에 넣고 펀칭을 하여 홀(102)을 성형하는 홀 성형단계와,And, the molding process is a hole forming step of forming the hole 102 by punching the material 101 is completed in the coating process in the coating process, as shown in the flute chart of Figure 3 and punched;

상기 홀 성형단계를 거친 소재(101)를 냉간다단성형기의 피어싱펀치에 의한 펀칭으로 내경 형상(103)을 완성시키는 펀칭단계와,A punching step of completing the inner diameter shape 103 by punching the material 101 which has undergone the hole forming step by a piercing punch of a cold cut forming machine;

상기 펀칭단계를 거친 소재(101)를 냉간다단성형기의 피어싱핀을 이용하여 관통시킴으로서 통공(104)을 얻어 코어(10)로 완성시키는 관통단계로 이루어진 것이다.By passing through the punching step of the material 101 by using a piercing pin of the cold and cold forming machine, the through hole 104 is obtained to complete the core 10.

또한, 상기 성형과정은 도4의 플루우챠트에 나타낸 바와같이 피막과정에서 피막완료된 소재(101)를 프레스의 다이에 넣고 펀칭하여 내경 형상(104)을 완성시키는 프레스 성형단계와,In addition, the molding process is a press molding step of completing the inner diameter shape 104 by punching the film-completed material 101 in the coating process and punching, as shown in the flute chart of Figure 4,

상기 프레스 성형단계를 거친 소재(101)를 프레스의 피어싱핀을 이용하여 관통시킴으로서 통공(104)을 얻어 코어(10)로 완성시키는 프레스 관통단계로 이루어진 것이다.By passing the material 101 subjected to the press molding step by using a piercing pin of the press to obtain a through hole 104 is made of a press through step of completing the core 10.

이와같이된 본발명의 실시예에 따른 작용을 설명하면 다음과 같다.Referring to the operation according to the embodiment of the present invention as described above is as follows.

먼저, 커팅과정에서는 롤 소재 즉, 권취되어 있는 봉(기계구조용 탄소강,냉간압조용 탄소강소재)을 풀어서 커팅을 하게 되는바, 완제품인 코어(10)의 체적을 구하여 필요한 길이 만큼 소재(101)를 커팅한후 호형상으로 커팅된 소재(101)는 직선기에 의해 직선상으로 펴게 된다.First, in the cutting process, the roll material, that is, the rod (the carbon steel for mechanical structure, the cold-rolled carbon steel material) that is wound is released and cut. After cutting, the material 101 cut into arc shapes is straightened by a straightener.

그리고, 상기 커팅과정을 거친 소재(101)는 1차 소성과정에서 펀치로 가압하여 커팅과정에 의해 불규칙하게 되어 있는 소재(101) 절단면의 평면을 평활하게 하여 주는 소성변형을 시키게 된다.In addition, the material 101 subjected to the cutting process is subjected to a plastic deformation to smooth the plane of the cut surface of the material 101 which is irregular by the cutting process by pressing with a punch in the first baking process.

또한, 상기 1차 소성변형을 거친 소재(101)는 2차 소성변형과정에 의해 소재(101)의 좌,우형상이 동일하도록 펀치로 가압하여 소성변형시킨다.In addition, the raw material 101 subjected to the primary plastic deformation is plastically deformed by pressing with a punch such that the left and right shapes of the material 101 are the same by the secondary plastic deformation process.

그리고, 상기 2차 소성변형과정을 거친 소재(101)를 소둔과정에 의해 소둔(어닐링)작업을 실시하여 소재(101)의 강도를 약화시켜 단조작업이 용이토록 한다.Then, annealing (annealing) the material 101 that has undergone the secondary plastic deformation process by annealing to weaken the strength of the material 101 so as to facilitate forging.

또한. 상기 소둔과정을 거친 소재(101)를 쇼트과정에 의해 소재(101)의 표면에 발생된 스케일을 제거한다.Also. The scale generated on the surface of the material 101 is removed by the short process of the material 101 subjected to the annealing process.

그리고, 상기 쇼트과정을 거친 소재(101)를 피막과정에 의해 아연계 인산염피막을 한후 소재(101)표면에 윤활제를 도포함으로서 소재(101)표면의 마찰계수를 줄여 단조가 용이하도록 한다.In addition, after the zinc 101 phosphate coating is performed on the material 101 which has undergone the shorting process, a lubricant is applied to the surface of the material 101 to reduce the coefficient of friction on the surface of the material 101 to facilitate forging.

또한, 상기 피막과정을 거친 소재(101)를 성형과정에 의해 완제품인 코어(10)로 성형하게 된다.In addition, the film 101 subjected to the coating process is molded into a core 10 that is a finished product by a molding process.

그리고, 상기 성형과정은 냉간다단성형기에 의한 제1실시예 또는 프레스에 의한 제2실시예로 실시 가능해진다.Then, the molding process can be carried out in the first embodiment of the cold and cold forming machine or the second embodiment of the press.

먼저, 상기 제1실시예에 따른 성형과정은 피막과정에서 피막완료된 소재(101)를 홀 성형단계에서 냉간다단성형기의 다이에 넣고 펀칭을 하여 홀(102)을 성형한다.First, in the molding process according to the first embodiment, the film 101 in the coating process is put into the die of the cold cut forming machine in the hole forming step to form a hole 102 by punching.

그리고, 상기 홀 성형단계를 거친 소재(101)를 펀칭단계에서 냉간다단성형기의 피어싱펀치에 의해 펀칭으로 내경 형상(103)을 완성시킨다.Then, the inner diameter shape 103 is completed by punching the raw material 101 which has undergone the hole forming step by the piercing punch of the cold and cold forming machine in the punching step.

또한, 상기 펀칭단계를 거친 소재(101)를 관통단계에 의해 냉간다단성형기의 피어싱핀을 이용하여 관통시킴으로서 통공(104)을 얻어 코어(10)로 완성시키게 된다.In addition, through the punching step of the material 101 is penetrated by the piercing pin of the cold and cold forming machine by the penetrating step to obtain the through hole 104 to complete the core 10.

그리고, 상기 제2실시예에 따른 성형과정은 피막과정에서 피막완료된 소재(101)를 프레스 성형단계에서 프레스의 다이에 넣고 펀칭하여 내경 형상(104)을 완성시킨다.In the forming process according to the second embodiment, the film 101 of the film completed in the coating process is put into the die of the press in the press forming step and punched to complete the inner diameter 104.

또한, 상기 프레스 성형단계를 거친 소재(101)를 프레스 관통단계에 의해 프레스의 피어싱핀을 이용하여 관통시킴으로서 통공(104)을 얻어 코어(10)로 완성시킬 수 있게 된다.In addition, the material 101, which has undergone the press forming step, may be penetrated by using a piercing pin of the press through a press through step, thereby obtaining the through hole 104 and completing the core 10.

이와같이된 본발명은, 롤소재를 커팅과정,1차 소성과정,2차소성과정,소둔과정,쇼트과정,피막과정,성형과정을 거침으로서 전기적 힘에 의해 오일 공급 방향을 결정해 주는 솔레노이드밸브에 결합되어 스프링을 지지하는 코어를 성형할 수 있도록함으로서, 별도의 열처리 과정이 없이 단조 자체의 강도로 강성을 유지하는 견고한 코어를 얻을 수 있고 향상된 생산성을 얻을 수 있으며 가격 경쟁력을 향상시킬수 있는 유용한 효과를 갖는다.The present invention has a solenoid valve which determines the oil supply direction by electric force by passing the roll material through cutting process, primary firing process, secondary firing process, annealing process, short process, coating process, and forming process. By forming the core to support the spring to be bonded, it is possible to obtain a solid core that maintains rigidity at the strength of the forging itself without any heat treatment process, to obtain improved productivity and to improve the price competitiveness Have

Claims (3)

삭제delete 완제품의 체적을 구하여 감겨있는 롤소재를 필요한 길이 만큼 커팅하는 커팅단계와,The cutting step of cutting the roll material wound to the required length by obtaining the volume of the finished product, 상기 커팅단계에 의해 불규칙하게 되어 있는 소재 절단면의 평면을 평활하게 하여 주기 위해 펀치로 가압하여 소성변형시키는 1차 소성변형단계와,A primary plastic deformation step of plastically deforming by pressing with a punch to smooth the plane of the cut surface of the material which is irregular by the cutting step; 상기 1차 소성변형단계을 거친 소재의 좌,우형상이 동일하도록 펀치로 가압하여 소성변형시키는 2차 소성변형단계와,A second plastic deformation step of plastically deforming by pressing with a punch such that the left and right shapes of the material which have undergone the first plastic deformation step are the same; 상기 2차 소성변형단계을 거친 소재를 소둔(어닐링)작업에 의해 강도를 약화시켜 단조작업이 용이토록 하기 위한 소둔단계와,An annealing step for reducing the strength by annealing (annealing) the material subjected to the second plastic deformation step to facilitate forging work, and 상기 소둔단계을 거친 소재의 표면에 발생된 스케일을 제거하기 위한 쇼트단계와,Short step for removing the scale generated on the surface of the material subjected to the annealing step, 상기 쇼트단계을 거친 소재의 표면 마찰계수를 줄여 단조를 용이토록 하기 위해 아연계 인산염피막을 한후 소재 표면에 윤활제를 도포하는 피막단계와,A coating step of applying a lubricant to the surface of the material after the zinc-based phosphate coating in order to reduce the surface friction coefficient of the material which has undergone the shorting step to facilitate forging; 상기 피막단계에서 피막완료된 소재를 냉간다단성형기의 다이에 넣고 펀칭을 하여 홀을 성형하는 홀 성형단계와,A hole forming step of forming a hole by punching the film-completed material into the die of the cold-gand forming machine in the coating step; 상기 홀 성형단계를 거친 소재를 냉간다단성형기의 피어싱펀치에 의한 펀칭으로 내경 형상을 완성시키는 펀칭단계와,A punching step of completing the inner diameter shape by punching the material that has undergone the hole forming step by a piercing punch of a cold kneading machine, 상기 펀칭단계를 거친 소재를 냉간다단성형기의 피어싱핀을 이용하여 관통시킴으로서 통공을 얻어 코어로 완성시키는 관통단계로 이루어진 것을 특징으로 하는 자동차 오토 트랜스미션용 솔레노이드밸브의 코어 성형방법.A method of forming a core of a solenoid valve for an automobile auto transmission, characterized in that it comprises a through step of passing through the punching material using a piercing pin of a cold cut molding machine to obtain a through hole to complete the core. 완제품의 체적을 구하여 감겨있는 롤소재를 필요한 길이 만큼 커팅하는 커팅단계와,The cutting step of cutting the roll material wound to the required length by obtaining the volume of the finished product, 상기 커팅단계에 의해 불규칙하게 되어 있는 소재 절단면의 평면을 평활하게 하여 주기 위해 펀치로 가압하여 소성변형시키는 1차 소성변형단계와,A primary plastic deformation step of plastically deforming by pressing with a punch to smooth the plane of the cut surface of the material which is irregular by the cutting step; 상기 1차 소성변형단계을 거친 소재의 좌,우형상이 동일하도록 펀치로 가압하여 소성변형시키는 2차 소성변형단계와,A second plastic deformation step of plastically deforming by pressing with a punch such that the left and right shapes of the material which have undergone the first plastic deformation step are the same; 상기 2차 소성변형단계을 거친 소재를 소둔(어닐링)작업에 의해 강도를 약화시켜 단조작업이 용이토록 하기 위한 소둔단계와,An annealing step for reducing the strength by annealing (annealing) the material subjected to the second plastic deformation step to facilitate forging work, and 상기 소둔단계을 거친 소재의 표면에 발생된 스케일을 제거하기 위한 쇼트단계와,Short step for removing the scale generated on the surface of the material subjected to the annealing step, 상기 쇼트단계을 거친 소재의 표면 마찰계수를 줄여 단조를 용이토록 하기 위해 아연계 인산염피막을 한후 소재 표면에 윤활제를 도포하는 피막단계와,A coating step of applying a lubricant to the surface of the material after the zinc-based phosphate coating in order to reduce the surface friction coefficient of the material which has undergone the shorting step to facilitate forging; 상기 피막단계에서 피막완료된 소재를 프레스의 다이에 넣고 펀칭하여 내경 형상을 완성시키는 프레스 성형단계와,A press molding step of completing the inner diameter shape by punching the film-completed material into the die of the press by the coating step; 상기 프레스 성형단계를 거친 소재를 프레스의 피어싱핀을 이용하여 관통시킴으로서 통공을 얻어 코어로 완성시키는 프레스 관통단계로 이루어진 것을 특징으로 하는 자동차 오토 트랜스미션용 솔레노이드밸브의 코어 성형방법.The method of forming a core of a solenoid valve for an automobile auto transmission, characterized in that the press through step of passing through the press forming step using a piercing pin of the press to obtain a through hole to complete the core.
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KR100491256B1 (en) * 2002-10-31 2005-05-25 주식회사 코우 clutch connector manufacturing method of washing machine
KR100540574B1 (en) * 2003-06-26 2006-01-10 두산중공업 주식회사 Manufacturing method for plastic injection mold used for making bumper fascia of automotive vehicle
KR101715037B1 (en) * 2015-04-08 2017-04-03 주식회사 세림티앤디 Manufacturing method nd euipment using cold forging of fuel rail boss for vehicle engine

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JPS626731A (en) * 1985-07-04 1987-01-13 Aida Eng Ltd Manufacture of bonnet for valve

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