KR20110138658A - Manufacturing method of ball head pin for vessel engine - Google Patents

Manufacturing method of ball head pin for vessel engine Download PDF

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KR20110138658A
KR20110138658A KR1020100058676A KR20100058676A KR20110138658A KR 20110138658 A KR20110138658 A KR 20110138658A KR 1020100058676 A KR1020100058676 A KR 1020100058676A KR 20100058676 A KR20100058676 A KR 20100058676A KR 20110138658 A KR20110138658 A KR 20110138658A
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hardness
manufacturing
gas
ball head
head pin
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KR1020100058676A
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Korean (ko)
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KR101184004B1 (en
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양광식
김태민
임귀종
이혁우
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주식회사 진양이엔지
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/20—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring workpiece characteristics, e.g. contour, dimension, hardness
    • 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
    • B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

PURPOSE: A manufacturing method of a ball head pin for a ship engine is provided to secure the high precision by practicing the hardness inspection and dimensional checking before and after a gas nitriding step. CONSTITUTION: A manufacturing method of a ball head pin for a ship engine comprises the following steps. The outer and inner diameter of the cut material is roughly processed. The material is quenched by the oil at 850°C. The hardness of the heat treated material is measured at the first. The material is processed to the size of a drawing. The processing of material according to the exact dimension is confirmed. The nitrogen is infiltrated on the surface of the material and the material is heat-treated in 580-600°C. The surface hardness of the nitrided material is measured. The amount of deformation is confirmed. The impurity attached to the spherical surface(3) of material except for a screw portion(2) of material is removed. The air is sprayed in the screw portion and the impurity is removed.

Description

선박 엔진용 볼 헤드 핀의 제조방법{Manufacturing method of ball head pin for vessel engine}Manufacturing method of ball head pin for vessel engine

본 발명은 선박 엔진용 볼 헤드 핀의 제조방법에 관한 것으로, 보다 상세하게는 볼 헤드 핀의 표면 열처리 및 경도검사 등의 공정을 통하여 고강도, 내구성을 향상시킬 수 있는 선박 엔진용 볼 헤드 핀의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a ball head pin for ship engines, and more particularly to the production of ball head pins for ship engines that can improve the high strength and durability through a process such as surface heat treatment and hardness test of the ball head pin It is about a method.

일반적으로, 볼 헤드 핀은 대형 선박의 엔진 내부의 실린더 헤드 상부에 장착되는 엔진 핵심 부품인 로커 암 어셈블리 중에 하나로서, 현재까지는 국내에서 실질적인 생산을 하지 못하고 있는 실정이며, 액화천연가스 운반선(LNGC)의 추진용으로는 전량 수입에 의존하고 있는 실정이다.In general, the ball head pin is one of the rocker arm assemblies, the core parts of the engine mounted on the upper cylinder head of the engine of a large ship, which has not been practically produced in Korea until now, and the LNG carrier (LNGC) The current situation depends on the total amount of imports.

상기 볼 헤드 핀은 선박의 엔진 내부에 일단 장착되고 나면 거의 교체가 불가능하기 때문에 선박의 수명이 다할 때까지 반영구적으로 사용하게 된다. 따라서 경도와 내마모성 등의 물성이 우수해야만 하는 특성이 있다.The ball head pin is semi-permanently used until the life of the ship because it is almost impossible to replace once mounted inside the engine of the ship. Therefore, there are properties that must be excellent in physical properties such as hardness and wear resistance.

특히 LNG 선박 건조량의 증가 추세에 따라 향후 경쟁력 있는 친환경적인 선박용 이중 연료 엔진(Duel Fuel Engine)이 각광받고 있으며, 그 수요 또한 빠르게 증가하고 있다.In particular, due to the increase in LNG shipbuilding volume, competitive eco-friendly ship's dual fuel engine (Duel Fuel Engine) is in the spotlight, and the demand is increasing rapidly.

하지만, 선박 엔진용 볼 헤드 핀은 전 세계로 수출 가능한 고부가가치의 핵심 부품임에도 불구하고 전술한 바와 같이, 전량 수입에 의존하고 있을 뿐만 아니라 제작 및 관련기술 모두 수입에 의존하고 있는 실정이다.However, although the ball head pin for ship engine is a high value-added core component that can be exported to the world, as described above, not only relying on imports but also manufacturing and related technologies depend on imports.

본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로, 크롬몰리브덴 합금강인 SCM440 소재를 이용하고 황삭, 열처리, 정삭, 가스질화, 구면 폴리싱 등의 공정을 통하여 고강도, 내구성을 향상시킨 선박 엔진용 볼 헤드 핀의 제조방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, using a SCM440 material of chromium molybdenum alloy steel, and improved high strength and durability through the process of roughing, heat treatment, finishing, gas nitriding, spherical polishing, etc. It is an object of the present invention to provide a method for manufacturing a head pin.

또한, 제품 제조과정 중에서 가스질화 단계 이전, 이후에 각각의 경도검사와 치수검사를 실시하여 고정밀도를 실현할 수 있는 선박 엔진용 볼 헤드 핀의 제조방법을 제공하는데 그 목적이 있다.It is also an object of the present invention to provide a method for manufacturing a ball head pin for a ship engine that can achieve high precision by performing hardness and dimensional inspections before and after the gas nitriding step in a product manufacturing process.

본 발명에 따른 선박 엔진용 볼 헤드 핀의 제조방법은, 필요한 길이로 절단된 소재의 내,외경을 거칠게 가공하는 황삭 가공단계와; 상기 황삭 가공된 소재를 850℃에서 유냉시키는 열처리단계와; 상기 열처리에 의해 재질 변경된 소재의 경도를 측정하는 제1차 경도검사 단계와; 상기 제1차 경도검사가 완료된 소재를 도면상의 치수대로 가공하는 정삭 가공단계와; 상기 정삭 가공된 소재가 정 치수대로 가공되었는지의 여부를 확인하는 제1차 치수검사 단계와; 상기 치수검사가 완료된 소재의 표면에 질소를 침투시키고 580∼600℃에서 열처리하는 가스질화 처리단계와; 상기 가스질화 처리된 소재의 표면경도를 측정하는 제2차 경도검사 단계와; 상기 가스질화 처리된 소재의 변형량을 확인하는 제2차 치수검사 단계와; 상기 가스질화 처리된 소재의 나사부를 제외한 구면에 부착된 불순물을 제거하는 구면 폴리싱 단계 및; 나사부에 에어를 분사하여 불순물을 제거하는 나사부 에어분사 단계로 이루어지는 것을 특징으로 한다.The method of manufacturing a ball head pin for a ship engine according to the present invention includes a roughing step of roughly processing the inner and outer diameters of a material cut to a required length; A heat treatment step of oil-cooling the rough processed material at 850 ° C .; A first hardness test step of measuring the hardness of the material changed by the heat treatment; Finishing processing step of processing the material in which the first hardness test is completed according to the dimensions on the drawing; A first dimension inspection step of confirming whether the finished material is processed to a regular dimension; A gas nitriding treatment step of infiltrating nitrogen on the surface of the material in which the dimensional inspection is completed and heat-processing at 580 to 600 ° C .; A second hardness test step of measuring a surface hardness of the gas-nitrided material; A second dimension inspection step of confirming a deformation amount of the gas-nitrided material; A spherical polishing step of removing impurities attached to the spherical surface except for the threaded portion of the gas-nitrided material; Characterized in that it comprises a screw portion air injection step of removing impurities by spraying air to the screw portion.

본 발명에 따른 선박 엔진용 볼 헤드 핀의 제조방법은, 크롬몰리브덴 합금강인 SCM440 소재를 이용하고 황삭, 열처리, 정삭, 가스질화, 구면 폴리싱 등의 공정을 통하여 고강도, 내구성을 향상시킨 제품을 자체 생산함으로써 국산화율을 높여 국가 경쟁력 향상에 기여하는 효과가 있다.The manufacturing method of the ball head pin for ship engine according to the present invention uses SCM440 material, which is chromium molybdenum alloy steel, and produces its own product with high strength and durability through processes such as roughing, heat treatment, finishing, gas nitriding and spherical polishing. By increasing the localization rate, it contributes to the improvement of national competitiveness.

또한, 제품 제조과정 중에서 가스질화 단계 이전, 이후에 각각의 경도검사와 치수검사를 실시하여 고정밀도를 실현함으로써, 수입 제품과의 경쟁에서 밀리지 않는 우수한 제품을 제공하는 효과가 있다.In addition, by performing a hardness test and a dimensional test before and after the gas nitriding step in the product manufacturing process to realize a high precision, there is an effect of providing an excellent product that does not push the competition with imported products.

도 1은 본 발명에 따른 선박 엔진용 볼 헤드 핀의 제조방법을 도시한 공정도.
도 2는 본 발명에 따른 선박 엔진용 볼 헤드 핀을 도시한 도면.1 is a process chart showing the manufacturing method of the ball head pin for ship engine according to the present invention.
Figure 2 shows a ball head pin for ship engine according to the present invention.

본 발명에 따른 선박 엔진용 볼 헤드 핀의 제조방법은, 필요한 길이로 절단된 소재의 내,외경을 거칠게 가공하는 황삭 가공단계와; 상기 황삭 가공된 소재를 850℃에서 유냉시키는 열처리단계와; 상기 열처리에 의해 재질 변경된 소재의 경도를 측정하는 제1차 경도검사 단계와; 상기 제1차 경도검사가 완료된 소재를 도면상의 치수대로 가공하는 정삭 가공단계와; 상기 정삭 가공된 소재가 정 치수대로 가공되었는지의 여부를 확인하는 제1차 치수검사 단계와; 상기 치수검사가 완료된 소재의 표면에 질소를 침투시키고 580∼600℃에서 열처리하는 가스질화 처리단계와; 상기 가스질화 처리된 소재의 표면경도를 측정하는 제2차 경도검사 단계와; 상기 가스질화 처리된 소재의 변형량을 확인하는 제2차 치수검사 단계와; 상기 가스질화 처리된 소재의 나사부를 제외한 구면에 부착된 불순물을 제거하는 구면 폴리싱 단계 및; 나사부에 에어를 분사하여 불순물을 제거하는 나사부 에어분사 단계로 이루어지는 것을 특징으로 한다.The method of manufacturing a ball head pin for a ship engine according to the present invention includes a roughing step of roughly processing the inner and outer diameters of a material cut to a required length; A heat treatment step of oil-cooling the rough processed material at 850 ° C .; A first hardness test step of measuring the hardness of the material changed by the heat treatment; Finishing processing step of processing the material in which the first hardness test is completed according to the dimensions on the drawing; A first dimension inspection step of confirming whether the finished material is processed to a regular dimension; A gas nitriding treatment step of infiltrating nitrogen on the surface of the material in which the dimensional inspection is completed and heat-processing at 580 to 600 ° C .; A second hardness test step of measuring a surface hardness of the gas-nitrided material; A second dimension inspection step of confirming a deformation amount of the gas-nitrided material; A spherical polishing step of removing impurities attached to the spherical surface except for the threaded portion of the gas-nitrided material; Characterized in that it comprises a screw portion air injection step of removing impurities by spraying air to the screw portion.

또한, 상기 정삭 가공단계에서는 CNC선반에 의해 도면사항대로 형삭작업이 이루어지고, 머시닝센터에 의해 수평,수직 방향으로 각각의 핀 홀 작업이 이루어지는 것을 특징으로 한다.In addition, in the finishing machining step, the forming operation is performed by the CNC lathe as described in the drawings, and each pin hole operation is performed in the horizontal and vertical directions by the machining center.

또한, 상기 가스질화 처리 전 소재의 나사부 표면에는 변형 및 깨짐을 방지하도록 질화방지제가 도포되는 것을 특징으로 한다.In addition, the nitriding agent is applied to the surface of the threaded portion of the material before the gas nitriding treatment to prevent deformation and cracking.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 따른 선박 엔진용 볼 헤드 핀의 제조방법을 도시한 공정도이고, 도 2는 본 발명에 따른 선박 엔진용 볼 헤드 핀을 도시한 도면이다.1 is a process chart showing a method of manufacturing a ball head pin for ship engine according to the present invention, Figure 2 is a view showing a ball head pin for ship engine according to the present invention.

도 1 및 도 2에 도시된 바와 같이, 본 발명에 따른 선박 엔진용 볼 헤드 핀의 제조방법은 황삭 가공단계(10), 열처리단계(20), 제1차 경도검사 단계(30), 정삭 가공단계(40), 제1차 치수검사 단계(50), 가스질화 처리단계(60), 제2차 경도검사 단계(70), 제2차 치수검사 단계(80), 구면 폴리싱 단계(90), 나사부 에어분사 단계(100)로 이루어진다.As shown in Figure 1 and 2, the manufacturing method of the ball head pin for ship engine according to the present invention is rough machining step 10, heat treatment step 20, the first hardness test step 30, finishing Step 40, the first dimension inspection step 50, the gas nitriding treatment step 60, the second hardness test step 70, the second dimension inspection step 80, the spherical polishing step 90, It consists of a thread air injection step (100).

먼저, 황삭 가공단계(10)는 필요한 길이로 절단된 소재의 내,외경을 거칠게 가공하는 단계로서, 소재로는 크롬몰리브덴 합금강인 SCM440를 이용하는 것이 바람직하다. 상기 소재는 밴드쇼, 핵쇼 등의 절단기계를 이용하여 필요한 길이에 맞게 절단한다.First, the roughing step 10 is a step of roughly processing the inner and outer diameters of the material cut to the required length, it is preferable to use SCM440 chromium molybdenum alloy steel as the material. The material is cut to the required length using a cutting system such as a band show or a nuclear show.

상기 단계에서는 선반이나 밀링을 이용하여 도면상에 도시된 볼 헤드 핀의 형상으로 가공하되 도면상의 치수대로 정밀하게 가공할 필요는 없다.In this step, the machining of the ball head pin shown in the drawing using a lathe or milling, but does not need to be precisely processed to the dimensions shown in the drawing.

상기 열처리단계(20)는 상기 황삭 가공된 소재를 850℃에서 유냉시키는 단계로서, 상기 소재를 재결정 온도 이상으로 가열한 뒤 850℃에서 윤활유를 이용하여 냉각시켜 조직을 치밀하게 만들어 강도를 높이게 된다. 이때, 크롬몰리브덴 합금강인 SCM440 소재는 상기 단계를 거쳐 SCM440H로 재질이 변경되게 된다.The heat treatment step 20 is a step of oil-cooling the rough processed material at 850 ° C., heating the material to a recrystallization temperature or more, and then cooling it with lubricating oil at 850 ° C. to increase the strength by densifying the tissue. At this time, the SCM440 material of chromium molybdenum alloy steel is changed to SCM440H through the above steps.

상기 제1차 경도검사 단계(30)는 상기 열처리에 의해 재질 변경된 소재의 경도를 측정하는 단계로서, 상기 열처리단계(20)를 거쳐 SCM440H로 재질이 변경된 소재를 에코팁 경도기(적외선 송신기를 이용하여 경도값을 측정하는 방식), 비커스 경도기(다이아몬드 피라미드형 압입자를 사용하여 경도값을 측정하는 방식) 등을 이용하여 경도를 측정하게 된다.The first hardness test step 30 is a step of measuring the hardness of the material changed by the heat treatment, the material changed to the material SCM440H through the heat treatment step 20 using an eco-tip hardness tester (infrared transmitter) Hardness is measured using a method of measuring hardness value), a Vickers hardness tester (a method of measuring hardness value using a diamond pyramidal indenter), and the like.

상기 정삭 가공단계(40)는 상기 제1차 경도검사가 완료된 소재를 도면상의 치수대로 가공하는 단계로서, CNC선반에 의해 도면사항대로 형삭작업이 이루어지며, 상기 CNC선반은 자동수치제어 방식으로 수치에 대한 입출력 정보를 컴퓨터가 자체 인식해서 축의 이동을 결정하는 컴퓨터 하드웨어를 기반으로 한 컨트롤러 소프트웨어가 탑재된 공작기계이다.The finishing machining step 40 is a step of processing the material in which the first hardness test is completed according to the dimensions in the drawing, the forming operation is performed according to the drawings by the CNC lathe, the CNC lathe numerical value by the automatic numerical control method It is a machine tool equipped with controller software based on computer hardware that determines the movement of the axis by the computer itself.

또한, 머시닝센터에 의해 수평,수직 방향으로 각각의 핀 홀(1) 작업이 이루어진다. 상기 핀 홀(1)은 다른 부품과 볼 헤드 핀을 고정하기 위해 사용되는 핀의 삽입을 위해 형성한다. 이 밖에도 소재에 형성된 각도를 깍아내는 작업(모따기) 및 라운드 작업 또한 상기 단계에서 이루어진다.In addition, each pin hole 1 is made in the horizontal and vertical directions by the machining center. The pin hole 1 is formed for the insertion of a pin used to fix the ball head pin with another component. In addition, the chamfering and rounding of the angle formed on the material is also performed at this step.

상기 제1차 치수검사 단계(50)는 상기 정삭 가공된 소재가 정 치수대로 가공되었는지의 여부를 확인하는 단계로서, 소재의 외경과 나사부(2)를 마이크로미터 측정법을 이용하고 구면 3D측정기를 이용한 3차원 검사를 실시한다.The first dimension inspection step 50 is a step of confirming whether the finished material is processed to a regular dimension, the outer diameter of the material and the threaded portion 2 using a micrometer measuring method and using a spherical 3D measuring instrument Perform three-dimensional inspection.

상기 가스질화 처리단계(60)는 상기 치수검사가 완료된 소재의 표면에 질소를 침투시키고 580∼600℃에서 열처리하는 단계로서, 소재의 표면에 대한 열처리를 통하여 내마모성과 흠집에 대한 저항성을 향상시키고 피로수명증진, 내식성, 내열성 등을 향상시킨다.The gas nitriding treatment step 60 is a step of infiltrating nitrogen into the surface of the dimensionally inspected material and heat-treating at 580 to 600 ° C. to improve wear resistance and scratch resistance and fatigue through heat treatment to the surface of the material. Improve lifespan, corrosion resistance and heat resistance.

한편, 상기 가스질화 처리 전 소재의 나사부(2) 표면에는 변형 및 깨짐을 방지하도록 질화방지제가 도포되며, 상기 질화방지제는 독일제 콘트루살 N023을 사용하는 것이 바람직하다.Meanwhile, an antinitration agent is applied to the surface of the screw portion 2 of the material before the gas nitriding treatment so as to prevent deformation and cracking, and the antinitration agent is preferably made of germany construal N023.

상기 제2차 경도검사 단계(70)는 상기 가스질화 처리된 소재의 표면경도를 측정하는 단계로서, 상기 가스질화 처리단계(60)를 거친 소재를 에코팁 경도기, 비커스 경도기 등을 이용하여 경도를 측정하게 된다.The second hardness test step 70 is to measure the surface hardness of the gas-nitridation material, using the eco-tip hardness tester, Vickers hardness tester, etc. Hardness is measured.

상기 제2차 치수검사 단계(80)는 상기 가스질화 처리된 소재의 변형량을 확인하는 단계로서, 소재의 외경과 나사부(2)를 마이크로미터 측정법을 이용한다.The second dimension inspection step 80 is to determine the deformation amount of the gas-nitrided material, the outer diameter of the material and the screw portion 2 using a micrometer measurement method.

상기 구면 폴리싱 단계(90)는 상기 가스질화 처리된 소재의 나사부를 제외한 구면(3)에 부착된 불순물을 제거하는 단계로서, 원통 연삭기를 이용하여 소재의 구면에 부착된 불순물을 제거하여 표면을 매끈하게 한다. 상기 소재를 연마하는데 사용되는 연마재로는 연삭돌을 사용하는 것이 바람직하다.The spherical polishing step 90 is a step of removing impurities attached to the spherical surface 3 except for the threaded portion of the gas-nitrided material. The surface is smoothed by removing impurities attached to the spherical surface of the material using a cylindrical grinding machine. Let's do it. It is preferable to use a grinding stone as the abrasive used to polish the material.

상기 나사부 에어분사 단계(100)는 나사부(2)에 에어를 분사하여 불순물을 제거하는 단계로서, 고압력의 에어분사기를 이용하여 나사부(2)에 에어를 공급함으로써 나사부(2)의 표면에 부착된 불순물을 제거하는 것이다.The screw air spraying step 100 is a step of removing impurities by injecting air into the screw portion 2, and is attached to the surface of the screw portion 2 by supplying air to the screw portion 2 using a high pressure air sprayer It is to remove impurities.

본 발명은 첨부된 도면을 참조하여 바람직한 실시예를 중심으로 기술되었지만 당업자라면 이러한 기재로부터 본 발명의 범주를 벗어남이 없이 많은 다양한 자명한 변형이 가능하다는 것은 명백하다. 따라서 본 발명의 범주는 이러한 많은 변형의 예들을 포함하도록 기술된 청구범위에 의해서 해석되어져야 한다.Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the invention from this description. Therefore, the scope of the invention should be construed by the claims described to include examples of many such variations.

1 : 핀 홀
2 : 나사부
3 : 구면1: pinhole
2: screw
3: spherical

Claims (3)

필요한 길이로 절단된 소재의 내,외경을 거칠게 가공하는 황삭 가공단계와;
상기 황삭 가공된 소재를 850℃에서 유냉시키는 열처리단계와;
상기 열처리에 의해 재질 변경된 소재의 경도를 측정하는 제1차 경도검사 단계와;
상기 제1차 경도검사가 완료된 소재를 도면상의 치수대로 가공하는 정삭 가공단계와;
상기 정삭 가공된 소재가 정 치수대로 가공되었는지의 여부를 확인하는 제1차 치수검사 단계와;
상기 치수검사가 완료된 소재의 표면에 질소를 침투시키고 580∼600℃에서 열처리하는 가스질화 처리단계와;
상기 가스질화 처리된 소재의 표면경도를 측정하는 제2차 경도검사 단계와;
상기 가스질화 처리된 소재의 변형량을 확인하는 제2차 치수검사 단계와;
상기 가스질화 처리된 소재의 나사부를 제외한 구면에 부착된 불순물을 제거하는 구면 폴리싱 단계 및; 나사부에 에어를 분사하여 불순물을 제거하는 나사부 에어분사 단계로 이루어지는 것을 특징으로 하는 선박 엔진용 볼 헤드 핀의 제조방법.A roughing step of roughly processing the inner and outer diameters of the material cut to the required length;
A heat treatment step of oil-cooling the rough processed material at 850 ° C .;
A first hardness test step of measuring the hardness of the material changed by the heat treatment;
Finishing processing step of processing the material in which the first hardness test is completed according to the dimensions on the drawing;
A first dimension inspection step of confirming whether the finished material is processed to a regular dimension;
A gas nitriding treatment step of infiltrating nitrogen on the surface of the material in which the dimensional inspection is completed and heat-processing at 580 to 600 ° C .;
A second hardness test step of measuring a surface hardness of the gas-nitrided material;
A second dimension inspection step of confirming a deformation amount of the gas-nitrided material;
A spherical polishing step of removing impurities attached to the spherical surface except for the threaded portion of the gas-nitrided material; A method of manufacturing a ball engine pin for a marine engine, characterized by comprising a screw air spraying step of removing impurities by spraying air to the screw. 제1항에 있어서, 상기 정삭 가공단계에서는 CNC선반에 의해 도면사항대로 형삭작업이 이루어지고, 머시닝센터에 의해 수평,수직 방향으로 각각의 핀 홀 작업이 이루어지는 것을 특징으로 하는 선박 엔진용 볼 헤드 핀의 제조방법.2. The ball head pin for ship engine according to claim 1, wherein the finishing operation is performed by a CNC lathe according to the drawings, and each pin hole operation is performed in the horizontal and vertical directions by a machining center. Manufacturing method. 제1항에 있어서, 상기 가스질화 처리 전 소재의 나사부 표면에는 변형 및 깨짐을 방지하도록 질화방지제가 도포되는 것을 특징으로 하는 선박 엔진용 볼 헤드 핀의 제조방법.The method of manufacturing a ball engine pin for ship engines according to claim 1, wherein an anti-nitration agent is applied to the threaded surface of the material before the gas nitriding treatment to prevent deformation and cracking.
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