KR20030045479A - Method for manufacturing crank shaft of hermetic reciprocating compressor - Google Patents

Method for manufacturing crank shaft of hermetic reciprocating compressor Download PDF

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Publication number
KR20030045479A
KR20030045479A KR1020010076206A KR20010076206A KR20030045479A KR 20030045479 A KR20030045479 A KR 20030045479A KR 1020010076206 A KR1020010076206 A KR 1020010076206A KR 20010076206 A KR20010076206 A KR 20010076206A KR 20030045479 A KR20030045479 A KR 20030045479A
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KR
South Korea
Prior art keywords
main shaft
crank
shaft portion
reciprocating compressor
crankshaft
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KR1020010076206A
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Korean (ko)
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KR100428551B1 (en
Inventor
서승돈
Original Assignee
삼성광주전자 주식회사
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Priority to KR10-2001-0076206A priority Critical patent/KR100428551B1/en
Priority to US10/138,997 priority patent/US20030103843A1/en
Priority to JP2002129968A priority patent/JP3754002B2/en
Priority to CN02140590A priority patent/CN1423067A/en
Priority to BR0203859-5A priority patent/BR0203859A/en
Priority to IT000964A priority patent/ITTO20020964A1/en
Publication of KR20030045479A publication Critical patent/KR20030045479A/en
Application granted granted Critical
Publication of KR100428551B1 publication Critical patent/KR100428551B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
    • 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
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/07—Crankshafts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Compressor (AREA)

Abstract

PURPOSE: A method is provided to reduce weight of the crank shaft and manufacturing procedures, while achieving improved strength of the crank shaft. CONSTITUTION: A crank shaft(40) comprises a main shaft unit(41) where a rotor of a hermetic reciprocating compressor is coupled; and a crank unit(42) arranged eccentrically with respect to the main shaft unit where a connecting rod is connected. The main shaft unit is formed into a hollow pipe, and the crank unit is formed into a sintered form. The end of the main shaft unit is inserted into a circular groove(42d) formed at the coupling surface of the crank unit, and the crank unit are joined with each other through a laser welding process. The hollow pipe and the sintered form are made of an iron based alloy containing carbon 0.5% or lower.

Description

밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법{METHOD FOR MANUFACTURING CRANK SHAFT OF HERMETIC RECIPROCATING COMPRESSOR}Manufacturing method of crankshaft of hermetic reciprocating compressor {METHOD FOR MANUFACTURING CRANK SHAFT OF HERMETIC RECIPROCATING COMPRESSOR}

본 발명은 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법에 관한 것이다.The present invention relates to a method for producing a crankshaft of a hermetic reciprocating compressor.

잘 알려진 바와 같이, 밀폐형 왕복식 압축기는 케이스 내에 전동기구부와 압축기구부가 설치되어 구성된다. 상기 전동기구부의 회전운동은 크랭크 샤프트에 의해 압축기구부의 왕복직선운동으로 변환되어 전달되며, 이에 의해 압축기구부의 피스톤이 실린더에서 왕복직선운동함으로써 냉매의 압축작용이 이루어진다.As is well known, the hermetic reciprocating compressor is constituted by a power mechanism and a compressor mechanism in a case. The rotational motion of the electric mechanism part is converted into a reciprocating linear motion of the compression mechanism by the crankshaft and transmitted. As a result, a compression action of the refrigerant is performed by the piston of the compression mechanism reciprocating in the cylinder.

이러한 밀폐형 왕복식 압축기의 전형적인 한 예가 도 1에 도시되어 있는 바, 이를 간단히 살펴보면 다음과 같다.A typical example of such a hermetic reciprocating compressor is shown in FIG. 1, which is briefly described as follows.

도 1에 도시된 바와 같이, 일반적인 밀폐형 왕복식 압축기는 상,하쉘(1)(2)로 이루어지는 케이스(10)의 내부에 전동기구부(20)와 압축기구부(30)가 설치되며, 이 전동기구부(20)와 압축기구부(30)는 크랭크 샤프트(40)에 의해 연결된다. 이 크랭크 샤프트(40)에 의해 전동기구부(20)의 회전운동이 압축기구부(30)의 왕복직선운동으로 변환되어 전달된다.As shown in FIG. 1, in the general hermetic reciprocating compressor, an electric mechanism part 20 and a compression mechanism part 30 are installed in a case 10 including upper and lower shells 1 and 2. 20 and the compression mechanism 30 is connected by the crankshaft 40. The crankshaft 40 converts the rotational movement of the electric mechanism part 20 into the reciprocation linear motion of the compression mechanism part 30, and is transmitted.

상기 크랭크 샤프트(40)는, 전동기구부(20)의 회전자(21)에 압입 결합되는 메인축부(41)와, 압축기구부(30)의 피스톤(31)과 커넥팅로드(32)의 개재하에 연결되는 크랭크부(42)가 일체로 구성된다. 도면에서 참조부호 22는 고정자, 33은 실린더블록, 그리고, 부호 34는 실린더헤드이다.The crankshaft 40 is connected to the main shaft portion 41 which is press-fitted to the rotor 21 of the power transmission mechanism portion 20, and through the piston 31 of the compression mechanism portion 30 and the connecting rod 32. The crank part 42 to be integrated is comprised integrally. In the drawings, reference numeral 22 is a stator, 33 is a cylinder block, and 34 is a cylinder head.

상기한 바와 같은 밀폐형 왕복식 압축기의 크랭크 샤프트를 제조하는 일반적인 방법은, 주물에 의해 크랭크 샤프트를 성형한 후, 이 성형품을 원하는 치수로 가공하여 제조하는 것이다. 즉, 크랭크 샤프트 주물 성형품을 만든 후 이 성형품을 도면에 준하여 황삭 및 선삭 등과 같은 절삭가공으로 흑피를 제거하고 원하는 치수를 만든다. 그런 다음 크랭크 샤프트의 강도를 증대시키기 위하여 열처리 등을 실시하고, 열처리된 제품을 재차 정삭 및 마무리 가공하여 크랭크 샤프트를 완성한다.The general method for manufacturing the crankshaft of the hermetic reciprocating compressor as described above is to form the crankshaft by casting, and then process the molded article to a desired dimension to produce it. That is, crankshaft castings are made and then the molded parts are removed by cutting, such as roughing and turning, according to the drawings, and the desired dimensions are made. Then, heat treatment or the like is performed to increase the strength of the crank shaft, and the heat treated product is finished and finished again to complete the crank shaft.

그러나, 상기한 바와 같은 일반적인 크랭크 샤프트 제조방법은, 주물품의 가공정도가 좋지 않기 때문에, 황삭, 선삭 및 연마 등과 같은 여러단계의 후가공을 반드시 거쳐야 하므로, 가공공수의 증가로 인한 생산성 저하 및 제조원가 상승을 초래하는 문제가 있다.However, the general crankshaft manufacturing method as described above does not have a good degree of processing of castings, so it is necessary to undergo several stages of post-processing such as roughing, turning, and polishing, thus reducing productivity and increasing manufacturing cost due to the increase in the number of machining. There is a problem that causes.

뿐만 아니라, 주물 산포의 증대로 초기 가공시 절삭량이 많아짐으로써 사이클 타임이 증가하여 생산성 저하의 원인이 되고 있으며, 또한, 소재 상태 및 경도 산포가 커서 가공시 부하 조건이 상이하고 툴의 마모가 촉진된다고 하는 문제도 있다.In addition, due to the increase in casting dispersion, the amount of cutting during initial machining increases, which increases the cycle time, which leads to a decrease in productivity. In addition, due to the large material condition and hardness dispersion, the load conditions are different and the tool wear is accelerated. There is also a problem.

또한, 일반적인 크랭크 샤프트 제조방법은, 크랭크 샤프트를 강도적으로 유리한 중공으로 제조하는 것이 어렵기 때문에, 종래 기술에 의해 제조된 크랭크 샤프트는 강도면에서 불리할 뿐만 아니라 중량이 무거워 압축기의 효율 저하를 초래하는 문제도 있다.In addition, the general crankshaft manufacturing method is difficult to manufacture the crankshaft into a hollow, which is advantageous in strength, so that the crankshaft manufactured by the prior art is not only disadvantageous in terms of strength, but also heavy in weight, resulting in a decrease in the efficiency of the compressor. There is also a problem.

또한, 일반적인 크랭크 샤프트 제조방법은, 주물 성형후 성형된 주물품에 비교적 깊은 구조의 오일유로를 후가공으로 형성하여야 하기 때문에, 오일유로 가공공정의 까다로움으로 생산성이 현저하게 떨어진다고 하는 문제도 있다.In addition, the general crankshaft manufacturing method has a problem that the oil flow path having a relatively deep structure must be formed by post-processing in the cast product after molding, and thus, the productivity of the oil flow path processing process is significantly reduced.

본 발명은 상기와 같은 문제를 감안하여 안출한 것으로, 산포가 일정하여 초기 절삭 가공이 필요없을 뿐만 아니라 후가공이 거의 필요없으며, 또한 오일유로 가공이 용이하게 이루어지는 등 가공공수가 대폭적으로 감소됨으로써 생산성 향상 및 제조원가 절감을 도모할 수 있는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법을 제공하는데 그 목적이 있다.The present invention has been made in view of the above problems, and since the dispersion is constant, not only the initial cutting process is required, but also the post-processing is almost unnecessary, and the processing time is greatly reduced such that the oil flow is easily processed, thereby improving productivity. And a crankshaft manufacturing method of a hermetic reciprocating compressor capable of reducing manufacturing costs.

본 발명의 다른 목적은, 경량이면서도 고강도의 크랭크 샤프트를 제조할 수 있는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법을 제공하는데 있다.Another object of the present invention is to provide a crankshaft manufacturing method of a hermetic reciprocating compressor capable of manufacturing a lightweight and high strength crankshaft.

도 1은 일반적인 밀폐형 왕복식 압축기를 나타낸 분해 사시도,1 is an exploded perspective view showing a general hermetic reciprocating compressor;

도 2는 본 발명의 일 실시예에 의한 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법을 설명하기 위한 도면, 그리고,2 is a view for explaining a crankshaft manufacturing method of the hermetic reciprocating compressor according to an embodiment of the present invention, and

도 3은 본 발명에 의해 제조된 밀폐형 왕복식 압축기의 크랭크 샤프트를 나타낸 사시도이다.Figure 3 is a perspective view of the crankshaft of the hermetic reciprocating compressor produced by the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

40;크랭크 샤프트41;메인축부40; crankshaft 41; main shaft portion

42;크랭크부41a,42c;오일유로42; crank portion 41a, 42c; oil flow path

42d;환상홈42d; annular groove

상기 목적을 달성하기 위한 본 발명에 의한 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법은, 메인축부와 이 메인축부로부터 일정량 편심된 크랭크부를 각각 분리 형성한 후, 이 메인축부와 크랭크부를 레이저용접으로 접합시켜 제조하며, 상기 메인축부는 중공의 파이프로, 상기 크랭크부는 소결 성형품으로 이루어진 것을 특징으로 한다.The crankshaft manufacturing method of the hermetic reciprocating compressor according to the present invention for achieving the above object is formed by separating the main shaft portion and the crank portion eccentrically separated from the main shaft portion, and then joining the main shaft portion and the crank portion by laser welding. The main shaft portion is a hollow pipe, and the crank portion is made of a sintered molded product.

상기 중공 파이프 및 소결 성형품의 재질은 탄소(C)가 0.5% 이하로 함유된 철계합금로 이루어진다. 바람직하게는 상기 중공 파이프는 기계구조용 탄소강관 또는 자동차구조용 탄소강관으로 이루어진다.The material of the hollow pipe and the sintered molded article is made of an iron-based alloy containing 0.5% or less of carbon (C). Preferably, the hollow pipe is made of carbon steel pipes for automobile structures or carbon steel pipes for automobile structures.

또한, 본 발명은, 상기 크랭크부의 메인축부 결합면에 메인축부의 단부가 수용되는 환상홈을 형성하고, 이 환상홈에 메인축부의 단부를 삽입한 상태에서 두 부재를 레이저용접으로 접합하는 것을 특징으로 한다. 여기서, 상기 환상홈은 호칭경에 대해서 H7h6로서 중간끼워맞춤을 가지도록 형성된다.In addition, the present invention is characterized in that the annular groove in which the end portion of the main shaft portion is formed on the main shaft portion engaging surface of the crank portion, and joining the two members by laser welding while the end portion of the main shaft portion is inserted into the annular groove. It is done. Here, the annular groove is formed to have an intermediate fit as H7h6 with respect to the nominal diameter.

본 발명의 바람직한 실시예에 의하면, 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법은, 탄소강관을 인발가공하고 이 탄소강관을 일정길이로 절단한 후 이 탄소강관의 적소에 오일유로를 가공하여 중공의 파이프로 구성되는 메인축부를 준비하는 단계; 철계합금 분말을 소결하여 편심축 및 웨이트밸런서를 가지는 성형품을 형성한 후 이 성형품에 오일유로를 가공함과 아울러 성형품의 일측에 소정깊이의 환상홈을 형성하여 철계합금의 소결품으로 이루어지는 크랭크부를 준비하는 단계; 상기 크랭크부의 환상홈에 메인축부의 단부를 삽입시킨 상태에서 메인축부와 크랭크부를 레이저용접기를 이용하여 접합시키는 단계; 접합된 크랭크 샤프트의 표면에 내식성 및 내마모성 증대를 위한 산화피막을 형성하는 단계; 및 최종 정삭가공 단계;를 포함하는 것을 특징으로 한다.According to a preferred embodiment of the present invention, a method for producing a crankshaft of a hermetic reciprocating compressor includes a hollow pipe by drawing a carbon steel pipe, cutting the carbon steel pipe to a certain length, and then processing an oil channel in place of the carbon steel pipe. Preparing a main shaft portion consisting of; After sintering the iron alloy powder to form a molded article having an eccentric shaft and a weight balancer, the oil flow is processed into the molded article, and an annular groove having a predetermined depth is formed on one side of the molded article to prepare a crank part made of the sintered product of the iron alloy. Doing; Joining the main shaft portion and the crank portion with a laser welder while the end portion of the main shaft portion is inserted into the annular groove of the crank portion; Forming an oxide film on the surface of the joined crankshaft to increase corrosion resistance and abrasion resistance; And a final finishing step.

이하, 첨부도면을 참조하여 본 발명의 바람직한 실시예를 구체적으로 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일 실시예에 의한 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법을 설명하기 위한 도면 이고, 도 3은 본 발명에 의해 제조된 밀폐형 왕복식 압축기의 크랭크 샤프트를 나타낸 사시도이다.Figure 2 is a view for explaining a crankshaft manufacturing method of the hermetic reciprocating compressor according to an embodiment of the present invention, Figure 3 is a perspective view showing a crank shaft of the hermetic reciprocating compressor manufactured by the present invention.

도 2 및 도 3에 도시된 바와 같이, 본 발명의 제조방법에 따라 제조된 크랭크 샤프트(40)는, 메인축부(41)와 이 메인축부(41)로부터 일정량 편심된 크랭크부(42)를 구비하며, 이 메인축부(41)와 크랭크부(42)가 레이저용접에 의해 접합되어 구성된다.2 and 3, the crankshaft 40 manufactured according to the manufacturing method of the present invention includes a main shaft portion 41 and a crank portion 42 eccentrically offset from the main shaft portion 41. The main shaft portion 41 and the crank portion 42 are joined to each other by laser welding.

상기 메인축부(41)는 중공의 파이프로 구성되는데, 본 실시예에서는 인발가공된 탄소강관을 일정길이로 절단하고, 절단된 탄소강관의 소정 위치에 오일유로(41a)를 가공하여 구성한다. 이와 같이 메인축부(41)를 중공의 파이프로 구성하게 되면, 강봉에 비하여 무게를 크게 경감시킬 수 있고, 또한, 직진도가 향상되는 등 산포가 일정하게 되어, 초기 가공이 거의 필요없게 된다. 한편, 본 실시예에서는 기계구조용 탄소강관이나 자동차구조용 탄소강관을 메인축부(41)로 이용하는 예를 설명하고 있으나, 이를 꼭 한정하는 것은 아니며, 탄소(C)가 0.5% 이하로 함유된 모든 철계합금을 이용하여 중공의 파이프 형태를 가지는 메인축부(41)를 형성할 수 있다.The main shaft portion 41 is composed of a hollow pipe. In this embodiment, the drawn carbon steel pipe is cut to a predetermined length, and the oil flow passage 41a is formed at a predetermined position of the cut carbon steel pipe. When the main shaft portion 41 is constituted by a hollow pipe in this manner, the weight can be greatly reduced as compared with the steel rod, and the dispersion is constant such that the straightness is improved, so that initial processing is almost unnecessary. On the other hand, in the present embodiment has been described an example of using the carbon steel pipe for mechanical structure or the carbon steel pipe for automobile structure as the main shaft portion 41, but not necessarily limited to this, all iron alloy containing 0.5% or less carbon (C) By using the main shaft portion 41 having a hollow pipe shape can be formed.

상기 크랭크부(42)는 편심축(42a)과 웨이트밸런서(42b)를 가지며, 철계합금분말을 소결하여 원하는 제품을 성형하는 분말야금법에 의해 형성된다. 여기서, 철계합금으로는 탄소(C)가 0.5% 이하로 함유된 모든 합금이 이용될 수 있다. 이와 같이 크랭크부(42)를 분말야금에 의한 소결품으로 제조하기 때문에, 가공정도가 좋아 후가공으로써의 절삭 가공 등을 없앨 수 있으며, 따라서, 가공공수의 감소를 도모할 수 있다. 그리고, 상기 크랭크부(42)는 편심축(42a)이 중공으로 형성되며, 이 중공으로부터 그 이면으로 관통하도록 형성된 다수의 오일유로(42c)를 구비한다.The crank part 42 has an eccentric shaft 42a and a weight balancer 42b, and is formed by a powder metallurgy method of sintering iron alloy powder to form a desired product. Here, as the iron alloy, all alloys containing 0.5% or less of carbon (C) may be used. Thus, since the crank part 42 is manufactured from the sintered product by powder metallurgy, the cutting precision is good and the cutting process by post-processing etc. can be eliminated, and therefore, the processing time can be reduced. The crank portion 42 has an eccentric shaft 42a formed in a hollow, and includes a plurality of oil passages 42c formed to penetrate from the hollow to the back surface thereof.

또한, 상기 크랭크부(42)는 그 일측면, 보다 구체적으로는 상기 메인축부 결합면에 메인축부(41)의 단부가 수용될 수 있는 환상홈(42d)이 형성되며, 따라서, 메인축부(41)와 크랭크부(42)의 레이저 용접시 상기 메인축부(41)의 단부가 상기 크랭크부(42)의 환상홈(42d)에 삽입된 상태에서 안정적으로 접합될 수 있다. 상기 환상홈(42d)은 대략 호칭경에 대해서 H7h6로서 중간끼워맞춤을 가지도록 형성된다.In addition, the crank part 42 has an annular groove 42d in which one end of the main shaft part 41 can be accommodated on one side thereof, more specifically, the main shaft part engaging surface, and thus, the main shaft part 41 is formed. In the laser welding of the crank part 42 and the crank part 42, the end portion of the main shaft part 41 may be stably joined while being inserted into the annular groove 42d of the crank part 42. The annular groove 42d is formed to have an intermediate fit as H7h6 with respect to the approximately nominal diameter.

상기와 같이 메인축부(41)와 크랭크부(42)를 각각 중공의 파이프 형태와 소결 성형품으로 분리 형성한 후에는, 이 메인축부(41)와 크랭크부(42)를 레이저 용접기를 이용하여 접합하는 바, 이를 구체적으로 설명하면 다음과 같다.After the main shaft portion 41 and the crank portion 42 are separately formed in the form of a hollow pipe and a sintered molded product as described above, the main shaft portion 41 and the crank portion 42 are joined using a laser welding machine. The bar will be described in detail as follows.

가공이 완료된 2개의 부품, 즉 메인축부(41)와 크랭크부(42)를 별도의 정교한 치구에 셋팅한 다음, 두 부재의 접합부를 레이저 용접으로 접합한다. 이때, 크랭크부(42)의 환상홈(42d)에 메인축부(41)의 단부가 삽입된 상태에서 레이저 용접이 이루어진다. 여기서, 레이저 용접 이음의 인장강도가 최대가 되는 용접조건은, 레이저 출력;3∼10Kw, 이송속도;0.51∼1.78m/min, 초점의 위치;20∼70°이다.The two parts which have been processed, that is, the main shaft part 41 and the crank part 42 are set in separate elaborate jig, and then the joints of the two members are joined by laser welding. At this time, laser welding is performed in the state in which the end of the main shaft portion 41 is inserted into the annular groove 42d of the crank portion 42. Here, the welding conditions in which the tensile strength of the laser welding joint is maximized are: laser output; 3 to 10 Kw, feed speed; 0.51 to 1.78 m / min, focus position; 20 to 70 degrees.

상기와 같은 용접조건으로 메인축부(41)와 크랭크부(42)를 레이저 용접한 다음에는 용접된 부재의 표면에 내식성 및 내마모성 증대를 위한 산화피막을 형성하고, 최종적으로 정삭 가공을 하여 크랭크 샤프트를 제조한다.After laser welding the main shaft portion 41 and the crank portion 42 under the welding conditions as described above, an oxide film is formed on the surface of the welded member to increase corrosion resistance and abrasion resistance. Manufacture.

이상과 같은 본 발명에 의하면, 동심도를 맞추기 위하여 종래 불필요하게 행해졌던 황삭 및 선삭 가공을 삭제하거나 최소 절삭량으로 대응이 가능하며, 무엇보다도 생산성이 높고 에너지 밀도가 높은 레이저를 이용하기 때문에, 짧은 시간 내에 용접이 이루어지므로 열변형이 작고, 비접촉식으로 보다 자유로운 설계가 가능하게 된다.According to the present invention as described above, it is possible to eliminate roughing and turning processes that have not been performed conventionally in order to match concentricity, or to cope with the minimum cutting amount, and above all, because a high productivity and high energy density laser is used, Since welding is performed, the thermal deformation is small, and the contactless design allows more freedom.

이상에서 설명한 바와 같은 본 발명에 의하면, 크랭크 샤프트의 메인축부가 인발 가공된 강관으로 이루어지기 때문에, 무게를 경감시킬 수 있을 뿐만 아니라 산포가 일정하여 초기 가공이 필요없고, 크랭크부가 소결 성형되기 때문에, 후가공이 거의 필요하지 않아 가공공수를 대폭적으로 감소시킬 수 있다.According to the present invention as described above, since the main shaft portion of the crankshaft is made of a drawn steel pipe, not only can reduce the weight, but also the dispersion is constant, no initial processing is necessary, and the crank portion is sintered and molded, Since almost no post-processing is required, the number of machining operations can be greatly reduced.

또한, 본 발명에 의하면, 크랭크부에 형성된 환상홈에 메인축부가 단부가 삽입된 상태에서 레이저용접에 의해 두 부재가 접합되기 때문에, 용접시 발생되는 비드가 환상홈을 메꾸면서 접합되므로 용접부분의 기공이 발생하지 않아 강도를 증대시킬 수 있으며, 용접비드가 외부로 돌출되지 않으므로 용접비드를 제거하기 위한 후공정을 없앨 수 있다.Further, according to the present invention, since the two members are joined by laser welding in the state where the end portion of the main shaft is inserted into the annular groove formed in the crank portion, the beads generated during welding are joined while filling the annular groove, so that Porosity does not occur can increase the strength, since the weld bead does not protrude to the outside can eliminate the post-process for removing the weld bead.

또한, 본 발명에 의하면, 메인축부가 파이프 형태로 이루어지기 때문에, 오일유로를 형성함에 있어서 메인축부의 반경방향으로 간단한 오일홈만을 형성하면 되므로, 종래 깊은 오일유로를 형성하는 것에 비하여 공정을 대폭 간소화시킬 수 있다.Further, according to the present invention, since the main shaft portion is formed in a pipe shape, only a simple oil groove in the radial direction of the main shaft portion needs to be formed in forming the oil flow path, thereby greatly simplifying the process as compared with the conventional deep oil flow path. You can.

또한, 크랭크부를 소결하여 형성하기 때문에, 가공정도가 우수하여 후가공이 거의 필요없어 가공공수를 감소시킬 수 있다.In addition, since the crank portion is formed by sintering, the machining accuracy is excellent, so that the post-processing is almost unnecessary, so that the number of machining operations can be reduced.

결론적으로, 본 발명에 의하면 저비용으로 고강도의 크랭크 샤프트를 제조할 수 있게 된다.In conclusion, according to the present invention, it is possible to manufacture a high-strength crank shaft at low cost.

이상, 본 발명을 본 발명의 원리를 예시하기 위한 바람직한 실시예에 대하여 도시하고 설명하였으나, 본 발명은 그와 같이 도시되고 설명된 그대로의 구성 및 작용으로 한정되는 것이 아니다. 오히려, 첨부된 특허청구범위의 사상 및 범주를 일탈함이 없이 본 발명에 대한 다수의 변경 및 수정이 가능함을 당업자들은 잘 이해할 수 있을 것이다. 따라서, 그러한 모든 적절한 변경 및 수정과 균등물들도 본 발명의 범위에 속하는 것으로 간주되어야 할 것이다.While the invention has been shown and described with respect to preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (6)

밀폐형 왕복식 압축기의 로터가 결합되는 메인축부와, 커넥팅로드가 연결되는 상기 메인축부에 대하여 일정량 편심된 크랭크부를 구비하는 크랭크 샤프트의제방법에 있어서,In the manufacturing method of the crankshaft having a main shaft portion to which the rotor of the hermetic reciprocating compressor is coupled, and a crank portion which is eccentric with respect to the main shaft portion to which the connecting rod is connected. 상기 메인축부는 중공의 파이프로, 그리고, 상기 크랭크부는 소결 성형품으로 각각 형성한 후, 이들 메인축부와 크랭크부를 레이저 용접하여 접합시키는 것을 특징으로 하는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법.And the main shaft portion is formed of a hollow pipe, and the crank portion is formed of a sintered molded product, and then the main shaft portion and the crank portion are joined by laser welding. 제 1 항에 있어서,The method of claim 1, 상기 중공의 파이프 및 소결 성형품의 재질은 탄소(C)가 0.5% 이하로 함유된 철계합금인 것을 특징으로 하는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법.The hollow pipe and the sintered molded article is made of a crankshaft of a hermetic reciprocating compressor, characterized in that the iron-based alloy containing less than 0.5% of carbon (C). 제 1 항에 있어서,The method of claim 1, 상기 중공 파이프는 기계구조용 탄소강관 또는 자동차구조용 탄소강관으로 이루어짐을 특징으로 하는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법.The hollow pipe is a crankshaft manufacturing method of a closed-type reciprocating compressor, characterized in that the carbon steel pipe for mechanical structure or carbon steel pipe for automobile structure. 제 1 항에 있어서,The method of claim 1, 상기 크랭크부의 메인축부 결합면에 메인축부의 단부가 수용되는 환상홈을 형성하고, 이 환상홈에 메인축부의 단부를 삽입한 상태에서 두 부재를 접합시키는 것을 특징으로 하는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법.A crank shaft of the hermetic reciprocating compressor, characterized in that an annular groove is formed in the main shaft portion engaging surface of the crank portion to accommodate an end portion of the main shaft portion, and the two members are joined while the end portion of the main shaft portion is inserted into the annular groove. Manufacturing method. 제 4 항에 있어서,The method of claim 4, wherein 상기 환상홈은 호칭경에 대해서 H7h6의 중간끼워맞춤을 가지도록 형성됨을특징으로 하는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법.And said annular groove is formed to have an intermediate fit of H7h6 with respect to the nominal diameter. 메인축부와 이 메인축부로부터 일정량 편심된 크랭크부를 구비하는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법에 있어서,In the crankshaft manufacturing method of a hermetic reciprocating compressor having a main shaft portion and a crank portion eccentrically fixed from the main shaft portion, 탄소강관을 인발가공하고 이 탄소강관을 일정길이로 절단한 후 이 탄소강관의 적소에 오일유로를 가공하여 중공의 파이프로 구성되는 메인축부를 준비하는 단계;Drawing a carbon steel pipe, cutting the carbon steel pipe to a predetermined length, and then processing an oil flow path in place of the carbon steel pipe to prepare a main shaft portion formed of a hollow pipe; 철계합금 분말을 소결하여 편심축 및 웨이트밸런서를 가지는 성형품을 형성한 후 이 성형품에 오일유로를 가공함과 아울러 성형품의 일측에 소정깊이의 환상홈을 형성하여 철계합금의 소결품으로 이루어지는 크랭크부를 준비하는 단계;After sintering the iron alloy powder to form a molded article having an eccentric shaft and a weight balancer, the oil flow is processed into the molded article, and an annular groove having a predetermined depth is formed on one side of the molded article to prepare a crank part made of the sintered product of the iron alloy. Doing; 상기 크랭크부의 환상홈에 상기 메인축부의 단부를 끼워 가조립한 상태에서 상기 메인축부와 크랭크부를 레이저 용접기를 이용하여 접합시키는 단계;Joining the main shaft portion and the crank portion with a laser welding machine in a state where the end portion of the main shaft portion is temporarily assembled into the annular groove of the crank portion; 접합된 크랭크 샤프트의 표면에 내식성 및 내마모성 증대를 위한 산화피막을 형성하는 단계; 및Forming an oxide film on the surface of the joined crankshaft to increase corrosion resistance and abrasion resistance; And 최종 정삭가공 단계;를 포함하는 것을 특징으로 하는 밀폐형 왕복식 압축기의 크랭크 샤프트 제조방법.Final finishing step; crankshaft manufacturing method of a hermetic reciprocating compressor comprising a.
KR10-2001-0076206A 2001-12-04 2001-12-04 Method for manufacturing crank shaft of hermetic reciprocating compressor KR100428551B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR10-2001-0076206A KR100428551B1 (en) 2001-12-04 2001-12-04 Method for manufacturing crank shaft of hermetic reciprocating compressor
US10/138,997 US20030103843A1 (en) 2001-12-04 2002-05-01 Method of manufacturing a crank shaft for a hermetic reciprocal compressor
JP2002129968A JP3754002B2 (en) 2001-12-04 2002-05-01 Crankshaft manufacturing method for hermetic reciprocating compressor
CN02140590A CN1423067A (en) 2001-12-04 2002-07-10 Method for machining enclosed reciprocating compressor crank axle
BR0203859-5A BR0203859A (en) 2001-12-04 2002-09-23 Method of manufacturing a crankshaft for a hermetically reciprocated compressor
IT000964A ITTO20020964A1 (en) 2001-12-04 2002-11-08 METHOD OF MANUFACTURE OF A CRANKSHAFT FOR A

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KR100428551B1 KR100428551B1 (en) 2004-04-28

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US20030103843A1 (en) 2003-06-05
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ITTO20020964A1 (en) 2003-06-05
KR100428551B1 (en) 2004-04-28
BR0203859A (en) 2004-09-28
CN1423067A (en) 2003-06-11

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