KR20020072859A - Forging method and dies of crank throw using the unbended preform - Google Patents

Forging method and dies of crank throw using the unbended preform Download PDF

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KR20020072859A
KR20020072859A KR1020010012883A KR20010012883A KR20020072859A KR 20020072859 A KR20020072859 A KR 20020072859A KR 1020010012883 A KR1020010012883 A KR 1020010012883A KR 20010012883 A KR20010012883 A KR 20010012883A KR 20020072859 A KR20020072859 A KR 20020072859A
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South Korea
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forging
bloom
forming
crank throw
shape
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KR1020010012883A
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Korean (ko)
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KR100418464B1 (en
Inventor
이성모
이원재
김병화
주성호
송민철
박연구
이재철
김성윤
박효준
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현대중공업 주식회사
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Priority to KR10-2001-0012883A priority Critical patent/KR100418464B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/08—Making machine elements axles or shafts crankshafts

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

Abstract

PURPOSE: A method and an apparatus for forging a crank throw are provided which prevent defects due to thickness reduction of the wings, form the pin part in a shape close to a circle to prevent material loss due to excessive material, and reduce gas cutting and processing operations to improve working efficiency and environment. CONSTITUTION: The method for forging a crank throw using unbending preform comprises a bloom forging step(100) of forging a first heated ingot in a bloom shape; a pin part forming forging step(200) of putting a pin part forming forging die on the lower center of the heated bloom and forging the upper center of the bloom using a flat anvil to form a pin part after second heating the bloom; a crank throw side surface inclination forming forging step(300) of forming a bloom central part on the upper surface of the pin part formed bloom through a side surface inclination forming forging die a cross section of which is formed in an inverse triangle shape with the die spaced apart from the bloom in a certain distance; a stretching forging step(400) of forming the wings by forging using the flat anvil the remaining part except the central part of the bloom that is formed through the crank throw side surface inclination forming forging step(300); a bending forging step of simultaneously bending the preform and forming the pin part in a circular shape by upper and lower part bending forging dies after third heating an unbending preform having such a shape that the wings of a final crank throw formed through the pin part forming forging step(200), crank throw side surface inclination forming forging step(300), and stretching forging step(400) are unfolded; and a finishing step of finishing the pin part formed through the bending forging step through the flat anvil and forging dies for maintaining a pin shape.

Description

언벤딩 형상의 예비성형체를 이용하는 크랭크스로우 단조 공법 및 단조장치{Forging method and dies of crank throw using the unbended preform}Forging method and dies of crank throw using the unbended preform}

본 발명은 언벤딩 형상의 예비성형체를 이용하는 크랭크스로우 단조 공법 및 단조장치에 관한 것으로, 선박 엔진용 대형 크랭크샤프트에 들어가는 크랭크스로우를 제조하기 위해 핀부 성형용 금형을 이용하여 언벤딩 형상의 예비성형체를 성형한 후 예비성형체를 굽힘단조용 금형을 이용하여 굽힘과 동시에 핀부를 원형으로 단조하는 언벤딩 형상의 예비성형체를 이용하는 크랭크스로우 단조 공법 및 단조장치에 관한 것이다.The present invention relates to a crank throw forging method and a forging apparatus using an unbend shaped preform, and to produce a crank throw into a large crankshaft for a ship engine, using a mold for forming a part of an unbending preform The present invention relates to a crank throw forging method and a forging apparatus using an unbending preform for forging a preform into a circle at the same time as the preform is bent using a die forging die.

종래의 대형 엔진용 크랭크스로우를 제작하기 위해서는 도 1 에 도시된 바와같이 인곳을 가열로에서 가열한 후 프레스를 이용하여 열간단조작업에 의해 블룸(Bloom) 형태로 제작하고, 상기 블룸을 단조작업을 통해 T 형상의 예비성형체로 단조한 다음, 상기 단조된 예비성형체를 굽힘용 상부금형과 굽힘용 하부금형을 이용하여 'ㄷ'자 형상을 이루도록 굽힘작업을 하고, 'ㄷ'자로 접은 제품을 가스절단 작업과 기계가공작업을 통해 크랭크스로우의 설계도면과 근접한 원형의 핀 모양을 가공하도록 되어 있었다.In order to produce a conventional crank throw for a large engine, as shown in FIG. 1, the ingot is heated in a heating furnace and manufactured in a bloom form by a hot forging operation using a press, and the bloom is forged. After forging into a T-shaped preform through, the forged preform is bent to form a 'c' shape by using an upper mold for bending and a lower mold for bending, and the product folded in the letter 'c' is gas cut. Through the work and machining work, the circular pin shape close to the design drawing of the crank throw was to be machined.

그러나, 상기 T 자 형상의 예비성형체는 도 2 에 도시된 바와 같이 굽힘 작업시의 소재 유동양상을 고려하지 않고 단순히 최종제품의 핀부와 날개부의 체적만을 계산하여 예비성형체 형상을 결정한 것으로, 소재가 강제로 접히게 되어 예비성형체의 날개부 두께가 설계도면 치수보다 얇아져 불량이 발생하게 된다. 또한, 핀부의 잉여 소재로 인한 가스절단 작업과 기계가공 작업은 많은 작업시간이 소요되고 소재의 손실이 증가되며, 이로 인해 비용이 증가되는 등 여러 가지 문제점이 있었다.However, the T-shaped preform is to determine the shape of the preform by simply calculating the volume of the pin portion and the wing portion of the final product without considering the material flow during the bending operation as shown in Figure 2, the material is forced The thickness of the wing portion of the preform becomes thinner than the design drawing dimensions, thereby causing a defect. In addition, the gas cutting work and the machining work due to the excess material of the pin portion takes a lot of work time and increases the loss of the material, resulting in a number of problems, such as increased costs.

본 발명은 상기와 같은 문제점을 고려하여 이루어진 것으로, 그 목적은 언벤딩 형상의 예비성형체를 성형하여 대형 크랭크스로우의 굽힘시 발생되는 날개두께 감소로 인한 불량을 방지하고, 핀부분 형상을 원형에 근접하게 성형하여 잉여소재로 인한 소재의 손실을 방지하고, 가스절단작업과 가공작업을 줄여 작업능률을 향상시킴과 동시에, 작업 환경을 개선하여 작업자의 건강을 도모할 수 있는 언벤딩형상의 예비성형체를 이용하는 크랭크스로우 단조 공법 및 단조장치를 제공하는 것이다.The present invention has been made in consideration of the above problems, the object of which is to form a pre-form of the unbending shape to prevent defects due to the reduction of wing thickness generated during bending of a large crank throw, and close to the circular shape of the pin portion It prevents the loss of material due to surplus materials, improves work efficiency by reducing gas cutting and processing work, and improves the working environment. It is to provide a crank throw forging method and forging apparatus to be used.

본 발명은 1차 가열된 인곳을 블룸형상으로 단조하는 블룸 단조단계; 상기 블룸을 2차 가열한 후 가열된 블룸의 중앙 하부에 핀부 성형 단조금형을 놓고 블롬의 중앙 상부를 평 엔빌로 단조작업하여 핀부를 형성하는 핀부 성형 단조단계; 상기 핀부가 성형된 블룸의 상부면에 일정간격을 유지하고 단면이 역삼각형인 측면 경사 성형 단조금형을 통해 블룸 중심부를 형성하는 크랭크스로우 측면 경사 성형 단조단계; 상기 크랭크스로우 측면 경사 성형 단조단계를 통해 형성된 블룸 중심부를 제외한 나머지 부분을 평엔빌로 단조하여 날개부를 형성하는 연신단조단계; 상기 핀부 성형 단조단계, 크랭크스로우 측면경사면 성형 단조단계, 연신단조단계를 통해 형성된 최종 크랭크스로우의 날개부가 펼친 형상인 언벤딩 형상의 예비성형체를 3차 가열한 후 상/하부 굽힘 단조금형에 의해 'ㄷ'자 형상으로 굽힘과 동시에 핀부를 원형으로 성형하는 굽힘단조단계; 상기 굽힘단조단계를 통해 형성된 핀부위를 핀 형상 유지용 단조금형 및 평 엔빌을 통해 마무리하는 마무리 단계를 통해 예비성형체의 날개부 두께감소를 방지하고 굽힘가공과 핀부 성형가공을 동시에 수행할 수 있는 언벤딩 형상의 예비성형체를 이용하는 크랭크스로우 단조 공법 및 단조장치를 제공함에 있다.The present invention provides a bloom forging step of forging a primary heated ingot into a bloom shape; A fin part forming forging step of forming the fin part by forging a flat part forming forging die under the center of the heated bloom after the second heating of the bloom and forging a flat upper part of the center of the blob; A crank throw side inclined forming forging step of maintaining a predetermined interval on the upper surface of the pin-formed bloom and forming a center portion of the bloom through a side inclined forming forging mold having an inverted triangle in cross section; An extension forging step for forming a wing part by forging the remaining portion except for the center of the bloom formed through the crank throw side inclined forming forging step with a flat yen bill; The upper and lower bending forging dies are heated by the upper and lower bending forging dies after heating the unformed preform having the shape of the wing portion of the final crank throw formed through the pin forming forging step, the crank throw side inclined surface forming forging step, and the drawing forging step. Bending forging step of forming a pin portion at the same time bending the c-shaped; Through the finishing step of finishing the pin part formed through the bending forging step through the forging die for maintaining the shape of the pin and the flat anvil, it is possible to prevent the reduction in the thickness of the wing part of the preform and to simultaneously perform the bending process and the forming of the fin part. The present invention provides a crank throw forging method and a forging apparatus using a preform having a bending shape.

도 1 은 종래의 크랭크 스로우 제작공정 개략도1 is a schematic view of a conventional crank throw manufacturing process

도 2 는 종래에 사용되고 있는 T형 예비성형체2 is a T-shaped preform used in the prior art

도 3 은 본 발명에 따른 크랭크스로우의 제작공정 개략도Figure 3 is a schematic view of the manufacturing process of the crank throw in accordance with the present invention

도 4 는 본 발명에 따른 크랭크스로우 핀부 성형용 단조금형 예시도Figure 4 is an illustration of the forging die for forming the crank throw pin portion according to the present invention

도 5 는 본 발명에 따른 크랭크스로우 핀부 성형 단조단계 개략도5 is a schematic view of the crank throw pin forming forging step according to the present invention;

도 6 은 본 발명에 따른 크랭크스로우 측면 경사 성형용 단조금형 예시도Figure 6 is an illustration of a forging die for crank throw side slope forming according to the present invention

도 7 은 본 발명에 따른 크랭크스로우 측면 경사 성형 단조단계 개략도7 is a schematic view of the crank throw side inclined forming forging step according to the present invention.

도 8 은 본 발명에 따른 크랭크스로우 날개부 연신 단조단계 개략도8 is a schematic drawing of the crank throw wing forging step according to the present invention

도 9 는 본 발명에 따른 크랭크스로우 상/하부 굽힘 단조금형 예시도Figure 9 is an illustration of the crank throw upper and lower bending forging mold according to the present invention

도 10은 본 발명에 따른 크랭크스로우 상/하부 굽힘 단조단계 개략도10 is a schematic view of the crank throw upper and lower bending forging step according to the present invention

도 11 은 본 발명에 따른 마무리 단조금형 및 마무리단계 개략도11 is a schematic forging die and finishing step according to the present invention

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

(10) : 블룸(Bloom) (11) : 홈(10): Bloom (11): Home

(20) : 핀부 성형 단조금형 (21) : 핀부 성형 단조금형 상부(20): pin part forging die (21): pin part forging die

(22) : 핀부 성형 단조금형 하부 (23) : 핀부 성형 단조금형 상부 중앙(22): Forging die bottom forging die 23: Forging die bottom forging center

(30) : 평 엔빌 (40) : 측면 경사 성형 단조금형30: flat anvil 40: side inclined forming forging mold

(50) : 상부 굽힘 단조금형 (51) : 반원홈(50): upper bending forging die (51): semicircular groove

(60) : 하부 굽힘 단조금형60: lower bending forging mold

(70) : 핀 형상 유지용 단조금형 (100): 블룸 단조단계70: forging die for maintaining the pin shape (100): bloom forging step

(200): 핀부 성형 단조단계 (300): 측면 경사 성형 단조단계(200): fin part forming forging step 300: side slope forming forging step

(400): 연신단조단계 (500): 굽힘단조단계(400): drawing forging step (500): bending forging step

(600): 마무리단계(600): finishing

도 3 은 본 발명에 따른 크랭크스로우의 제작공정 개략도를 도시한 것으로,본 발명은 인곳을 블룸형상으로 단조하는 블룸 단조단계(100)와, 상기 블룸의 중앙부에 핀부를 형성하는 핀부 성형 단조단계(200)와, 상기 핀부위가 성형된 블룸의 상부면에 크랭크스로우 측면 경사를 성형하는 측면 경사 성형 단조단계(300)와, 상기 블룸의 중앙부를 제외한 나머지 부분을 단조작업하여 날개부를 스트레칭하는 연신단조단계(400)와, 상기 핀부 성형단조단계(200)와 측면 경사 성형 단조단계(300) 및 연신단조단계(400)를 통해 형성된 언벤딩 형상의 예비성형체를 가열 후 'ㄷ'자 형상으로 굽힘과 동시에 핀부를 원형으로 성형하는 굽힘단조단계(500) 및 핀부를 마무리 하는 마무리단계(600)로 구성되어 있다.Figure 3 shows a schematic view of the manufacturing process of the crank throw according to the present invention, the present invention is the bloom forging step 100 forging the ingot into the bloom shape, and the fin part forging step for forming a pin portion in the center of the bloom ( 200), the side slope forming forging step 300 for forming a crank throw side slope on the upper surface of the bloom in which the pin portion is formed, and the stretching forging stretching the wings by forging the remaining portions except the center portion of the bloom. After the step 400, the fin part forming forging step 200 and the side warp forming forging step 300 and the stretch forging step 400 is formed by heating and bending the 'b' shape after the preform At the same time, it consists of a bending forging step 500 for forming the pin portion in a circular shape and a finishing step 600 for finishing the pin portion.

상기 블룸 단조단계(100)는 인곳을 가열로에서 1차 가열한 후 프레스를 이용하여 열간단조하여 블룸의 형태로 단조작업한다.In the bloom forging step 100, the ingot is first heated in a heating furnace and then hot forged using a press to forge in the form of bloom.

상기 핀부 성형 단조단계(200)는 도 5 에 도시된 바와 같이 블룸(10)을 2차 가열한 후 언벤딩 형상의 예비성형체의 핀 부분을 성형하는 단조공정으로, 상기 블룸(10)의 중심 하부에 핀부 성형 단조금형(20)을 두고 평엔빌(30)을 이용하여 단조한다.The fin part forming forging step 200 is a forging process of forming the fin portion of the preform having an unbending shape after the second heating of the bloom 10 as illustrated in FIG. 5. The pin part is formed in the forging die 20 and is forged by using the flat yen bill 30.

상기 핀부 성형 단조금형(20)은 블룸(10)에 접촉되는 상부(21)가 바닥면에 접촉되는 하부(22)보다 협소한 공간을 구비하고 있으며, 상기 상부 중앙(23)이 도 4 에 도시된 바와 같이 원호의 곡선으로 형성되어 있다. 즉, 핀부 성형 단조금형(20)과 평엔빌(30)에 의해 2차 가열된 블룸 하부에는 하부면이 상부면보다 넓은 홈(11)이 형성되게 된다.The pin portion forging die 20 has a narrower space than the lower portion 22 in contact with the bottom surface of the upper portion 21 in contact with the bloom 10, the upper center 23 is shown in FIG. As shown, it is formed by the curve of an arc. That is, the bottom 11 of the bloom heated by the fin part forging die 20 and the flat enville 30 has a groove 11 having a lower surface than the upper surface.

상기 크랭크스로우 측면 경사 성형 단조단계(300) 및 연신 단조단계(400)는핀부 성형단조금형에 의해 핀부위가 단조된 블룸(10)을 언벤딩 형상의 예비성형체로 만드는 단조공정으로 상기 핀부위가 성형된 블룸을 도 6 에 도시된 바와 같이 단면이 역삼각형이고 일측에 손잡이가 형성된 측면 경사 성형 단조금형(40)을 이용하여 도 7 에 도시된 바와 같이 하부에 홈(11)이 형성된 블룸의 상부면에 일정간격을 유지하고 크랭크스로우 측면 경사를 성형한다.The crank throw side slope forming forging step 300 and stretching forging step 400 is a forging process in which the bloom 10, the forging of the pin part is forged by a molding part forging die, into a preform having an unbending shape. As shown in FIG. 6, the formed bloom has an inverted triangle in cross section and a side slope formed forging die 40 having a handle on one side, and the upper part of the bloom having a groove 11 formed therein as shown in FIG. 7. Maintain a certain distance on the face and form the crank throw side slope.

도 8 은 본 발명에 따른 크랭크스로우 날개부 연신 단조단계의 개략도를 도시한 것으로, 상기 측면 경사 성형 단조단계가 끝난 블룸(10)의 양측 상부면을 평엔빌(30)을 이용하여 길이방향으로 길게 단조한다.8 is a schematic view of the crank throw wing extension forging step according to the present invention, the upper side of both sides of the bloom 10, the side slope forming forging step is completed using a flat enville 30 in the longitudinal direction Forging

도 9 는 본 발명에 따른 크랭크스로우 상/하부 굽힘 단조금형 예시도를, 도 10 은 본 발명에 따른 크랭크스로우 상/하부 굽힘 단조공정 개략도를 도시한 것으로, 크랭크스로우 측면 경사 성형단조단계(300) 및 연신 단조단계(400)가 끝난 블룸을 3차 가열한 후 이를 상부 굽힘 단조금형(50)과 하부 굽힘 단조금형(60) 사이에 놓고 상부 굽힘 단조금형(50)을 하부 굽힘 단조금형(60) 방향으로 이동시켜 블룸을 'ㄷ'자 형상으로 굽힘가공함과 동시에, 핀부를 원형으로 성형한다. 이때, 상기 핀부를 설계도면에 근접한 원형으로 성형하기 위하여 블룸의 핀부가 원형으로 충진될 때 까지 단조작업을 계속한다.9 is a schematic view of a crank throw upper and lower bending forging die according to the present invention, Figure 10 is a schematic view of the crank throw upper and lower bending forging process according to the present invention, crank throw side slope forming forging step 300 And the third heating of the finished forging step 400 is completed, and then placed between the upper bending forging die 50 and the lower bending forging die 60 and the upper bending forging die 50 to the lower bending forging die 60. While moving in the direction, the bloom is bent into a 'c' shape and at the same time, the pin portion is formed in a circular shape. At this time, the forging operation is continued until the fin part of the bloom is filled in a circular shape so as to mold the fin part into a circular shape close to the design drawing.

상기 상부 굽힘 단조금형(50)은 중앙부에 반원형상의 반원홈(51)이 형성되어 있고 일측에 손잡이가 설치되어 있으며, 하부 굽힘 단조금형(60)은 상부가 개방된 '∪'자 형상을 구비하고 있다. 즉, 상기 3차 가열된 블룸(10)은 상부 굽힘 단조금형(50)의 이동에 의해 굽힘가공과 핀부위 가공이 동시에 이루어진다.The upper bending forging die 50 has a semi-circular semicircular groove 51 is formed in the center and the handle is installed on one side, the lower bending forging die 60 has a '∪' shape of the upper opening have. That is, the third heated bloom 10 is simultaneously bent and the pin portion processing by the movement of the upper bending forging die (50).

도 11 은 본 발명에 따른 마무리 단조공정 개략도를 도시한 것으로, 상기와 같이 핀부가 원형에 가깝게 단조작업된 소재를 핀 형상 유지용 단조금형(70)을 끼우고, 평 엔빌로 마무리 단조공정을 수행하여 전체적인 형상을 완성한다.Figure 11 is a schematic view of the finish forging process according to the present invention, the pin forging the shape of the forging mold 70 for maintaining the shape of the pin forging the material close to the circular as described above, and performs the finish forging process with a flat anvil To complete the overall shape.

상기와 같이 본 발명은 인곳을 가열한 후 프레스로 열간단조 작업을 하여 블룸 형상으로 단조하고, 상기 블룸의 중앙부에 핀부 성형용 단조금형과 평 엔빌을 이용하여 핀부위에 곡률을 성형시키고, 크랭크스로우 날개부 경사 성형용 단조금형과 평 엔빌을 이용하여 언벤딩 형상의 예비 성형체를 단조하며, 상기 예비성형체를 가열한 후 상부 굽힘단조 금형과 하부 굽힘 단조금형을 이용하여 굽힘과 동시에 핀부를 원형으로 성형하고, 핀 형상 유지용 단조금형과 평엔빌로 마무리하여 최적 크랭크스로우 단조품을 성형하도록 되어 있다.As described above, the present invention heats the ingot, and forges the shape of the heat by forging a press into the bloom, and forms a curvature on the pin by using a forging die and a flat anvil for forming the pin at the center of the bloom, and crank throw Forging the preform of the unbending shape by using the forging die and the flat anvil for the wing slope forming, and after heating the preform, by using the upper bending forging die and the lower bending forging die, simultaneously forming the pin part in a circular shape In addition, it finishes with a forging die for pin shape maintenance, and a flat anvil, and forms an optimal crank throw forging.

본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형실시가 가능한 것은 물론이고, 그와 같은 변경은 청구범위 기재의 범위내에 있게 된다.The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

이와 같이 본 발명은 종래의 소재 유동양상을 고려하지 않고 단순히 최종제품의 핀부와 날개부의 체적만을 고려하여 설계한 T 자 형상의 예비성형체를 최종크랭크스로우 단조품 형상에서 날개부를 자연스럽게 펼친 언벤딩 형상의 예비성형체로 바꿈으로서 크랭크스로우 날개부 두께감소를 방지하여 작업효율을 향상시켰다.As described above, the present invention is a pre-bending pre-bending unfolded shape of the T-shaped preform designed in consideration of the volume of the fin part and the wing of the final product, and naturally spreading the wing part in the shape of the final crank throw forging without considering the conventional material flow. By converting into a molded body, the thickness of the crank throw blade is prevented from being reduced, thereby improving the work efficiency.

또한, 굽힘단조 작업시 상부 굽힘 단조금형의 형상을 크랭크스로우 단조품의 핀부 형상과 동일한 원형으로 하여 굽힘과 동시에 핀부를 단조작업함으로써 가스 절단작업 및 기계 가공작업량을 감소시켰으며, 이로 인한 시간과 소재의 손실로 인한 비용의 증가를 방지하고, 가스절단 작업의 생략에 따른 유해 가스의 발생을 제거에 의해 작업자가 쾌적한 작업 환경에서 작업을 할 수 있도록 하여 작업자의 건강에 해를 끼치지 않으며 작업 능률을 향상시키는 등 여러 가지 효과가 있다.In addition, during bending forging, the shape of the upper bending forging die has the same shape as the shape of the pin portion of the crank throw forging, and thus forging the pin portion at the same time as bending, thereby reducing the amount of gas cutting work and machining work. It prevents the cost increase due to the loss and eliminates the harmful gas generated by the elimination of gas cutting work so that the worker can work in a pleasant working environment without harming the health of the worker and improving the work efficiency. There are many effects.

Claims (2)

1차 가열된 인곳을 블룸형상으로 단조하는 블룸 단조단계;A bloom forging step of forging the primary heated ingot into a bloom shape; 상기 블룸을 2차 가열한 후 가열된 블룸의 중앙 하부에 핀부 성형 단조금형을 놓고 블롬의 중앙 상부를 평 엔빌로 단조작업하여 핀부를 형성하는 핀부 성형 단조단계;A fin part forming forging step of forming the fin part by forging a flat part forming forging die under the center of the heated bloom after the second heating of the bloom and forging a flat upper part of the center of the blob; 상기 핀부가 성형된 블룸의 상부면에 일정간격을 유지하고 단면이 역삼각형인 측면 경사 성형 단조금형을 통해 블룸 중심부를 형성하는 크랭크스로우 측면 경사 성형 단조단계;A crank throw side inclined forming forging step of maintaining a predetermined interval on the upper surface of the pin-formed bloom and forming a center portion of the bloom through a side inclined forming forging mold having an inverted triangle in cross section; 상기 크랭크스로우 측면 경사 성형 단조단계를 통해 형성된 블룸 중심부를 제외한 나머지 부분을 평엔빌로 단조하여 날개부를 형성하는 연신단조단계;An extension forging step for forming a wing part by forging the remaining portion except for the center of the bloom formed through the crank throw side inclined forming forging step with a flat yen bill; 상기 핀부 성형 단조단계, 크랭크스로우 측면경사면 성형 단조단계, 연신단조단계를 통해 형성된 최종 크랭크스로우의 날개부가 펼친 형상인 언벤딩 형상의 예비성형체를 3차 가열한 후 상/하부 굽힘 단조금형에 의해 'ㄷ'자 형상으로 굽힘과 동시에 핀부를 원형으로 성형하는 굽힘단조단계;The upper and lower bending forging dies are heated by the upper and lower bending forging dies after heating the unformed preform having the shape of the wing portion of the final crank throw formed through the pin forming forging step, the crank throw side inclined surface forming forging step, and the drawing forging step. Bending forging step of forming a pin portion at the same time bending the c-shaped; 상기 굽힘단조단계를 통해 형성된 핀부위를 핀 형상 유지용 단조금형 및 평 엔빌을 통해 마무리하는 마무리 단계를 포함하는 것을 특징으로 하는 언벤딩 형상의 예비성형체를 이용하는 크랭크스로우 단조 공법.Crank-throw forging method using the pre-form of the unbending shape, characterized in that it comprises a finishing step of finishing the pin portion formed through the bending forging step through a pin shape forging mold and a flat anvil. 인곳을 열간 단조작업하여 블룸의 형상으로 단조하는 프레스와,A press for forging the ingot into a shape of a bloom by hot forging work, 상기 단조된 블룸 중앙 하부에 접촉되고, 바닥면에 접촉되는 하부면보다 블룸 중앙 하부에 접촉되는 상부가 협소한 공간을 구비하고, 상기 상부의 중앙부가 원호의 곡선을 구비하도록 형성된 핀부 성형 단조용 금형과,A forging die for forming a fin part formed in contact with a lower portion of the center of the forged bloom, the upper portion being in contact with a lower portion of the center of the bloom than the lower surface in contact with the bottom surface, and the central portion of the upper portion having a circular arc. , 상기 블룸의 상부에 접촉되어 크랭크스로우 측면경사를 성형하고 역삼각형 단면을 구비하는 측면 경사면 성형용 단조금형과,A forging die for forming a side slope in contact with the top of the bloom to form a crank throw side slope and having an inverted triangular cross section; 상기 블룸을 단조하는 평 엔빌과,Flat anvil forging the bloom, 상기 핀부 성형 단조용 금형에 의해 형성된 예비성형체 핀부에 접촉되는 원형의 홈을 구비하고 일측에 손잡이가 형성된 상부 굽힘금형과,An upper bending mold having a circular groove contacting the preform pin part formed by the pin part forging die and having a handle formed on one side thereof; 상기 상부 굽힘금형 및 블룸이 삽입되는 개방형 홈을 구비하는 '∪' 형상의 하부 굽힘금형으로 구성된 것을 특징으로 하는 크랭크스로우 단조장치.Crank throw forging apparatus, characterized in that consisting of the lower bending mold of the '∪' shape having an open groove into which the upper bending mold and bloom are inserted.
KR10-2001-0012883A 2001-03-13 2001-03-13 Forging method and dies of crank throw using the unbended preform KR100418464B1 (en)

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JPS6289544A (en) * 1985-10-14 1987-04-24 Kobe Steel Ltd Method and device for partial die forging of crank throw
JPH06575A (en) * 1992-06-19 1994-01-11 Kobe Steel Ltd Method for forging half-assembled crank throw
JPH06179035A (en) * 1992-12-10 1994-06-28 Japan Casting & Forging Corp Manufacture of crank shaft

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KR100491538B1 (en) * 2002-09-23 2005-05-27 현대중공업 주식회사 Closed-die Forging Method and Dies of Crank Throw Pin Part
KR101223222B1 (en) * 2010-07-19 2013-01-17 주식회사 평산 method of manufacturing door frame in wind tower
CN104493030A (en) * 2014-12-10 2015-04-08 鞍钢重型机械有限责任公司 Forging method for crank forging piece
CN105478644A (en) * 2015-12-18 2016-04-13 中冶陕压重工设备有限公司 Free forging method for Y-shaped forge piece
CN107159831A (en) * 2017-06-30 2017-09-15 陕西宏远航空锻造有限责任公司 A kind of forging method of cross forging part
CN112496246A (en) * 2020-10-09 2021-03-16 南昌航空大学 Method for solving die forging stuffiness of automobile crankshaft forge piece
CN113926973B (en) * 2021-10-28 2023-07-21 中聚信海洋工程装备有限公司 Combined anvil die and process for forging large-scale crank throw
WO2023071376A1 (en) * 2021-10-28 2023-05-04 中聚信海洋工程装备有限公司 Combined anvil die for forging large crank throw, and process
WO2023071375A1 (en) * 2021-10-28 2023-05-04 中聚信海洋工程装备有限公司 Combined anvil die for forging large crank throw
CN113926973A (en) * 2021-10-28 2022-01-14 中聚信海洋工程装备有限公司 Combined anvil die and process for forging large crank throw
CN114160733A (en) * 2021-12-15 2022-03-11 陕西宏远航空锻造有限责任公司 Forming method of Y-shaped aluminum alloy die forging with narrow high platforms on two sides of two ends
CN114160733B (en) * 2021-12-15 2024-05-24 陕西宏远航空锻造有限责任公司 Forming method of Y-shaped aluminum alloy die forging with narrow and high platforms at two sides of two ends
CN114309428A (en) * 2022-01-20 2022-04-12 中聚信海洋工程装备有限公司 Forging process of large crank throw and crank neck
CN114309429A (en) * 2022-01-20 2022-04-12 中聚信海洋工程装备有限公司 Crank forming and forging process
WO2023138030A1 (en) * 2022-01-20 2023-07-27 中聚信海洋工程装备有限公司 Two-fire forming forging process for large crank throw
CN114309428B (en) * 2022-01-20 2023-11-10 中聚信海洋工程装备有限公司 Forging process for large curved turning neck
CN114309429B (en) * 2022-01-20 2024-03-19 中聚信海洋工程装备有限公司 Crank forming forging process

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