KR20150018862A - Method for upset forging of rod end - Google Patents

Method for upset forging of rod end Download PDF

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KR20150018862A
KR20150018862A KR20150014980A KR20150014980A KR20150018862A KR 20150018862 A KR20150018862 A KR 20150018862A KR 20150014980 A KR20150014980 A KR 20150014980A KR 20150014980 A KR20150014980 A KR 20150014980A KR 20150018862 A KR20150018862 A KR 20150018862A
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upset
heating
rod
forging
striking
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KR20150014980A
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Korean (ko)
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KR101509589B1 (en
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박영견
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박영견
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations

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

Abstract

The present invention relates to a method for forging a rod upset with a rod end. The method for forging a rod upset with a rod end includes: a designing step for determining the lengths of a non-heating section and a heating section of a tip end of material depending on the diameter of a rod material and the forge ratio; a step of heating the heating section as much as the diameter of a rod from the tip end of the rod except for the non-heating section; a step of forming an upset preforming unit by performing a first upset hitting to expand the forge ratio at least 1.7 times by upset-hitting the heated tip end of the rod in an axial direction, a second upset hitting to expand the forge ratio of the tip end on which the first upset hitting has performed at least 2.7 times, and a third upset hitting to expand the forge ratio of the tip end on which the second upset hitting has performed at least 3.4 times; and a step of forming the rod end by pressing the upset preforming unit with a press in the transverse direction to the axial direction of the rod. Therefore, according to the present invention, the forming method can increase the forge ratio of the preforming unit by heating a predetermined section as much as the diameter of rod from the tip end of the rod except for the non-heating part and performing the upset hitting in multi stages.

Description

말단성형부를 갖는 봉상체 업셋 단조방법{METHOD FOR UPSET FORGING OF ROD END}[0001] METHOD FOR UPSET FORGING OF ROD END [0002] BACKGROUND OF THE INVENTION [0003]

본 발명은 말단성형부(Rod End)를 갖는 봉상체 업셋(Upset) 단조방법에 관한 것이다.The present invention relates to a bar upset forging method having a rod end.

일반적으로 봉상체의 말단부를 봉상체와 일체로 하여 베어링 하우징, 연결고리 등 말단성형부를 단조에 의해 형성하는 경우가 많다.Generally, the end portion of the rod body is integrally formed with the rod body, and the end forming portion such as the bearing housing and the connecting ring is often formed by forging.

단조 성형에 있어서, 피가공 봉상체 소재의 단면적에 비해 최종 말단성형부의 단면적이 비교적 큰 경우, 즉, 단조비가 큰 경우에는, 단조 성형하려고 하는 부위를 소정의 소성변형 온도로 가열하여 연성과 유동성을 크게 한 다음, 축방향으로 타격하는 업셋 단조작업을 시행하여 말단부의 직경과 단면적을 확대하는 예비성형을 한다.In the forging process, when the cross-sectional area of the final end forming portion is relatively larger than the cross-sectional area of the workpiece material, that is, when the forging ratio is large, the portion to be forged is heated to a predetermined plastic deformation temperature, And then performing an upset forging operation that strikes in the axial direction to preliminarily expand the diameter and cross-sectional area of the end portion.

이와 같이 말단부를 타격하여 예비성형을 할 때, 특히, 단조비가 큰 경우에는 말단부가 전체적으로 가열 연화되어 있는 경우, 말단부에 가해진 타격력이 말단부에 전체에 충분히 효과적으로 전달되기 어렵다. 그래서, 국부 과대변형이나 좌굴현상이 발생하여 원하는 예비성형 형상이 얻어지지 않는 문제가 있다.When the preforming is performed by striking the distal end in this way, particularly when the forging ratio is large, it is difficult for the tip to be applied to the distal end part to be sufficiently effectively transmitted to the distal end part when the distal end part is heated and softened as a whole. Therefore, local overstrain or buckling phenomenon occurs, and a desired preformed shape is not obtained.

본 발명은 상술한 종래의 문제점을 해결하기 위한 것으로, 말단성형부를 갖는 봉상체 업셋 단조방법을 제공하는 것을 목적으로 한다.SUMMARY OF THE INVENTION It is an object of the present invention to provide a rod upset forging method having an end forming section.

상기한 본 발명의 목적을 달성하기 위하여, 단조비와 봉상체 소재의 직경을 고려하여 소재 말단부의 비가열 구간 및 가열구간의 길이를 정하는 설계단계와, 봉상체 소재의 말단부로부터 적어도 봉상체 소재직경에 상당하는 길이의 구간을 상기 비가열 구간을 두고 상기 가열구간을 가열하는 단계와, 상기 봉상체 소재의 가열된 말단부를 축방향으로 따라 업셋타격하여 단조비를 적어도 1.7배까지 확대하는 1차 업셋 타격과, 1단계 업셋 타격이 실시된 상기 말단부의 단조비를 적어도 2.7배까지 확대하는 2차 업셋 타격과, 2단계 업셋 타격이 실시된 상기 말단부의 단조비를 적어도 3.4배까지 확대하는 3차 업셋 타격하여 업셋 예비성형부를 형성하는 단계와, 업셋 예비성형부를 축방향의 가로방향으로 프레스로 가압하여 말단 성형부를 형성하는 단계로 이루어진다.In order to accomplish the object of the present invention, there is provided a method of manufacturing a bar-shaped body, comprising the steps of: designating a length of a heating section and a non-heating section of a material end portion in consideration of a diameter of a forging material and a rod- Heating the heating section with the non-heated section in a section of a length corresponding to the length of the non-heated section; A second upset striking step for increasing the forging ratio of the end portion subjected to the first step upset striking to at least 2.7 times and a third upset striking step for increasing the monotony ratio of the end portion struck at the second step upset striking to at least 3.4 times, Forming an upset preformed portion by pressurizing the upset preformed portion in a transverse direction in the axial direction to form an end formed portion; It is.

상기 부분 가열단계는 업셋 타격시에 말단부의 과대한 퍼짐을 방지하기 위하여 단조비를 갖는 예비성형부를 형성시켜 말단 성형부를 단조성형하기 위하여 비가열구간을 벗어난 소정의 가열구간을 나선형 유도가열 코일내에 삽입하여 950 ~ 1000℃로 고주파 유도가열하는 것이 바람직하다.In the partial heating step, a preformed portion having a forging ratio is formed in order to prevent excessive spreading of the distal end portion during the upset striking. In order to forge-form the endformed portion, a predetermined heating period out of the non-heating period is inserted into the helical induction heating coil It is preferable to perform high-frequency induction heating at 950 to 1000 占 폚.

전술한 바와 같이 본 발명에 따른 말단성형부를 갖는 봉상체 업셋 단조방법은 봉상체의 최말단부로부터 적어도 봉상체 직경에 해당하는 비가열부를 두고 소정의 가열구간을 소정의 온도로 가열하고, 소성파괴와 말단부 퍼짐이 일어나지 않도록 다단계에 걸친 업셋 타격을 실시함으로써 최말단부가 과대하게 확대되지 않고, 좌굴현상이 발생하지 않으면서 예비성형부의 단조비를 크게 할 수 있다. As described above, the rod-upset forging method according to the present invention includes heating the predetermined heating section to a predetermined temperature with the non-heating section corresponding to at least the diameter of the rod body from the outermost end of the rod body, By performing the upset striking over a plurality of stages so as to prevent terminal spreading, the forefront end portion is not excessively expanded and the forging ratio of the preformed portion can be increased without buckling.

도 1은 본 발명의 실시예에 따른 봉상체 업셋 단조방법의 공정순서를 나타낸 공정 흐름도.
도 2는 도 1의 공정 흐름도를 시각적으로 나타낸 공정 흐름도.
도 3은 피가공 소재의 비가열구간을 나타낸 개념도.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow chart showing a process sequence of a bar upset forging method according to an embodiment of the present invention; FIG.
FIG. 2 is a process flow chart visually showing a process flow chart of FIG. 1; FIG.
3 is a conceptual view showing a non-heating period of a workpiece.

이하, 첨부된 도면들을 참조하여 본 발명의 바람직한 실시예에 따른 말단성형부를 갖는 봉상체 업셋 단조방법을 설명한다.Hereinafter, a bar upset forging method having an end forming section according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

본 발명의 바람직한 실시예에 따른 방법으로 제조될 단조성형 완성품의 예는 양쪽 말단부에 베어링 하우징을 가지는 자동차의 사용되는 커넥팅 로드이다. 커넥팅 로드는 봉상체 소재의 양 단부에 업셋 단조가 시행되어 소재 단면적의 3배 이상의 단면적을 갖는 큰 단조비의 성형부를 갖는다. An example of a forging finished article to be produced by a method according to a preferred embodiment of the present invention is a used connecting rod of a motor vehicle having a bearing housing at both ends. The connecting rod has a large forging ratio molding section having upset forging at both ends of the rod body material and having a cross sectional area at least three times the cross sectional area of the workpiece.

이러한 큰 단조비의 제품을 성형하는 과정을 도 1 및 도 2에 도시된 공정순서에 따라 설명한다. The process of molding such a large forging ratio product will be described according to the process sequence shown in Figs. 1 and 2. Fig.

단조설계 단계(S10)에서는 미리 정해진 커넥팅 로드 완성품의 규격과 소정의 피가공 봉상체 소재(10)의 직경(D)을 고려하여 적절한 예비성형부(Preform Section)를 설계한다. 적절한 예비성형부의 설계는 피가공 봉상체 소재(10)의 직경(D)과 완성품의 단면적, 체적 등을 고려하여 단조비(R)를 산출하고, 피가공 봉상체 소재(10) 말단부의 비가열 구간(lo) 및 가열구간(l 1 )의 길이, 가열온도, 업셋 타격력, 덧살(Flash) 단면적 계산 등 가공작업 변수를 산정하는 작업을 한다, 이와 같은 가공작업 변수를 산정하기 위해서는 3차원 CAD 모형으로부터 계산하거나 미리 만들어 놓은 경험식이나 실험식을 이용한다.In the forging design step S10, an appropriate preform section is designed in consideration of the predetermined standard of the connecting rod finished product and the diameter D of the predetermined workpiece material 10. The design of the appropriate preformed part is such that the forging ratio R is calculated in consideration of the diameter D of the workpiece body 10 and the cross sectional area and volume of the finished workpiece and the non- range (lo) and heating zone (l 1) length, heating temperature, and the upset impact force, deotsal (Flash) and the operation for estimating machining parameters such as calculated cross-sectional area, these three-dimensional CAD model in order to estimate the machining operation variable of Or use empirical formulas or empirical formulas that are made in advance.

일반적으로 단조비(Forging Ratio, R)는 단조전의 단면적을 단조 종료후의 단면적으로 나눈 값으로 규정하고 있다. 따라서, 단조비(R)는 고정 그립(Grip)으로부터 연장되어 가열된 말단부(자유단)의 단면적을 Ao, 업셋팅 단조후의 단면적을 A1이라 하면, 단조비 R = A1/Ao로 나타낸 것이다. 그러나, 단조비(R)는 아래 식 (2)와 같이 말단부 자유단의 길이(l 2 ) {비가열구간(lo) + 가열구간(l 1 )}를 업셋 타격 후의 축소된 길이(l 3 )로 나눈 값, 또는, 업셋 타격 후의 직경(D1)을 봉상체 소재(10)의 직경(D)으로 나눈 값으로 등가적으로 나타낼 수 있다.Generally, the Forging Ratio (R) defines the cross sectional area before forging divided by the cross sectional area after forging. Therefore, the forging ratio R is represented by the forging ratio R = A1 / Ao, where Ao is the cross-sectional area of the heated end (free end) extending from the fixed grip Grip and A is the cross-sectional area after the upset forging. However, the forging ratio R can be calculated by dividing the length l 2 (non-heating period lo + heating period l 1 ) of the free end of the distal end by the reduced length l 3 after the upset striking, divided by the, or, as divided by the diameter (D) of the blow after the upset diameter (D 1) of the bar-shaped material 10 can be represented equivalently.

R = A1/Ao = l 2 / l 3 = D1 /D ㆍㆍㆍㆍㆍㆍㆍ(1)R = A1 / Ao = l 2 / l 3 = D 1 / D ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ (1)

소재준비 단계(S20)에서는 커넥팅 로드 완성품에 따라 미리 소정의 길이로 절단된 피가공 봉상체 소재(10)를 작업물량만큼 사전에 준비하여 업셋 장비의 전단에 설치된 장입장치에 적재해 놓는다. 장입장치에 적재된 피가공 봉상체 소재(10)는 자동 또는 수동으로 1개씩 순차적으로 가열장치로 이동된다.In the material preparation step S20, the workpiece material 10 cut into a predetermined length in advance according to the connecting rod finished product is prepared in advance by the amount of the workpiece, and is loaded on the charging device provided on the front end of the upsetting device. The workpieces 10 to be processed loaded on the charging device are transferred to the heating device one by one automatically or manually.

가열장치로 이동되어온 피가공 봉상체 소재(10)의 말단부는 가열장치의 가열부분에 삽입되어 소정의 가열구간이 가열된다(S30). 가열단계(S30)에서 가열구간을 신속히 그리고 정확한 온도로 가열하기 위하여 고주파 유도가열방식이 바람직하며, 고주파 유도가열장치를 이용하는 경우, 봉상체 소재(10)의 말단부 가열구간이 나선형 유도 가열코일(20) 내에 삽입된다. The distal end portion of the workpiece 10 moved to the heating device is inserted into the heating portion of the heating device, and the predetermined heating portion is heated (S30). When a high-frequency induction heating apparatus is used, a heating section at the distal end of the rod-shaped body material 10 is heated by a helical induction heating coil 20 .

도 3은 피가공 소재의 비가열 및 가열구간을 도식적으로 나타낸 것이며, 도시된 바와 같이, 봉상체 소재(10)의 말단부는 최말단부로부터 비가열 구간(lo)을 지나서 가열구간(l 1 )이 유도 가열코일(20) 내에 삽입되어 나선형 유도 가열코일(20) 내에 위치하는 가열구간(l 1 )을 가열시킨다. 물론 이때, 나선형 유도 가열코일(20) 내에 삽입되지 않은 비가열 구간(lo)도 가열구간(l 1 )의 영향을 받아 온도가 상승되지만 상대적으로 가열구간(l 1 )의 온도보다 저온상태를 유지한다.Figure 3 shows schematically a non-heating and the heating section of the worked material, the distal end of the bar-shaped material 10 after the non-heating period (lo) from the most distal end heating section (l 1), as shown It is inserted into the induction heating coil 20 to heat the heating section (l 1) which is located in the spiral induction heating coil 20. Of course, this time, keeping the low temperature state than the temperature of the spiral induction heating coil heating zone (l 1) to (20), non-heating period is not inserted (lo) also under the influence of the heating section (l 1) temperature rises within but relatively do.

가열단계(S30)는 업셋 타격시에 말단부의 과대한 퍼짐을 방지하기 위하여 봉상체의 첨단부로부터 적어도 봉상체 소재직경(D)에 상당하는 길이를 비가열구간(lo)으로 하여 저온 영역으로 하고, 큰 단조비를 갖는 예비성형부를 형성시켜 말단 성형부를 단조성형하기 위하여 소정의 가열구간(l 1 )을 나선형 유도 가열코일(20)내에 삽입하여 950 ~ 1000℃로 가열하여 변형저항을 적게 하는 것이 바람직하다. The heating step (S30) by the non-heating period (lo) for a length corresponding to at least a bar-shaped material diameter (D) from the tip ends of the bar-shaped elements in order to prevent an excessive expansion of the end portion at the time of the upset hit and the low-temperature region , it is heated to form a preform having a large forging ratio is 950 ~ 1000 ℃ inserted into the spiral induction heating coil 20, a predetermined heating interval (l 1) to parts of the molding forged ends forming the low deformation resistance desirable.

비가열구간(lo)은 봉상체 소재의 직경(D)과 단조비(R)에 비례하므로, 다음과 같은 경험적으로 얻어진 수식(2)에 의해 산출할 수 있다. Since the non-heated section lo is proportional to the diameter D of the rod body material and the forging ratio R, it can be calculated by the following empirical equation (2).

lo = k × R/3 × D ㆍㆍㆍㆍㆍㆍㆍ(2) lo = k x R / 3 x D ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ ㆍ (2)

여기서 k는 소재의 종류, 가열온도, 타격속도와 가압력, 작업환경 등에 따라 경험적으로 얻은 상수로서,일반적으로 0.8 ~ 1.7의 범위 내에 있으며, 통상의 경우에는 바람직하게는 1.3 ~ 1.5의 값을 취한다. Here, k is a value obtained empirically according to the kind of the material, the heating temperature, the blowing speed, the pressing force, the working environment, etc., and is generally in the range of 0.8 to 1.7, .

식(2)를 이용하여 비가열구간 산출의 예를 들어 설명하면, 봉상체 소재(10)의 직경(D)이 20mm, 산출된 단조비가 3.0, 그리고, 상수(k) 값이 1.5인 경우, 비가열구간 lo = 1.5 × 3/3 × 20mm = 30mm가 된다.For example, when the diameter D of the rod-like member 10 is 20 mm, the calculated forging ratio is 3.0, and the constant k is 1.5, The non-heating period lo = 1.5 x 3/3 x 20 mm = 30 mm.

가열된 말단부는 차가운 금형과 접촉할 때 온도차이로 인하여 열을 빼앗긴다. 이때의 열손실의 크기는 말단부와 금형 사이의 온도차 뿐 아니라, 말단성형부 형상과 말단부 체적에 대한 접촉면적의 비율, 또, 금형의 냉각면적과의 접촉시간 및 열전달방식에 의해 끊임없이 열을 빼앗긴다.The heated end is deprived of heat by the temperature difference when it comes into contact with the cold mold. The size of the heat loss at this time is constantly deprived of heat not only by the temperature difference between the end portion and the mold but also by the ratio of the contact area to the shape of the end molding portion and the volume of the end portion and the contact time with the cooling area of the mold and the heat transfer method .

속도가 느린 프레스 단조에서의 가열된 말단부와 금형사이의 접촉면적 및 접촉시간이 크므로 상당히 큰 열량이 운반되어 사라진다. 그 때문에 말단부의 온도는 예비성형부 형성 업셋단계(S40)에서 피어싱 단계(S70)의 변형에 이르기까지 필요한 값 이상으로 유지하기 위하여 950 ~ 1000℃가 바람직하다. Because of the large contact area and contact time between the heated end and mold in slow press forging, a considerably large quantity of heat is carried and disappeared. Therefore, the temperature of the distal end portion is preferably 950 to 1000 ° C in order to keep the temperature at the preformed portion formation upset step S40 to the deformation of the piercing step S70 or more.

가열단계(S30)에서 말단부가 가열된 봉상체 소재(20)는 예비성형 단계(S40)로 이동된다. 예비성형 단계(S40)는 기본적으로 긴 봉상체 소재(10)의 가열된 말단부를 축방향으로 압축하여 단면적을 크게 하고 길이를 짧게 하는 업셋 타격이다. 이와 같은 업셋 타격에 의한 예비성형 단계(S40)는 상하 또는 좌우로 개폐되는 그립다이(Grip Die)와 전후로 운동하는 펀치(Heading Punch)로 구성되는 업셋 장비에 의하여 이루어진다. In the heating step S30, the bar-like material 20 heated at the distal end portion is moved to the preforming step S40. The preforming step S40 is basically an upset striking in which the heated end portion of the long bar-like material 10 is axially compressed to increase the cross-sectional area and shorten the length. The preforming step S40 by the upset striking is performed by an upset device composed of a grip die which is opened / closed vertically or horizontally, and a heading punch which moves back and forth.

업셋 타격중에 가열된 말단부의 과대한 단조성형에 의한 취성파괴와 크랙을 방지하기 위하여 복수 단계에 걸쳐 업셋 타격한다. 즉, 가열된 말단부의 단조비(Forging Ratio)를 적어도 1.7배까지 확대하는 1차 업셋 타격과, 1차 업셋 타격이 실시된 상기 말단부의 단조비를 적어도 2.7배까지 확대하는 2차 업셋 타격과, 2차 업셋 타격이 실시된 상기 말단부의 단조비를 적어도 3.4배까지 확대하는 3차 업셋 타격으로 예비성형부를 형성하게 된다(S40). During the upset strikes, the upset strikes through a plurality of steps to prevent brittle fracture and cracks due to excessive forging of the heated end portions. That is, the first upset striking which increases the forging ratio of the heated end portion to at least 1.7 times, the second upset striking which increases the monotony ratio of the end portion subjected to the first upset striking to at least 2.7 times, The preformed portion is formed by a third-order upset striking which increases the forging ratio of the end portion of the second upset struck to at least 3.4 times (S40).

예비성형부가 형성된 말단성형부의 단조성형(S50)은 예비성형부를 프레스로 가압하여 말단 성형부를 형성하는 프레스 단조공정으로, 프레스에 마련된 상부 금형과 하부 금형사이에 아직 고온을 유지하고 있는 예비성형부를 위치시킨 뒤 봉상체 소재(10)의 축방향 가로방향으로 가압한다. 즉, 금형의 상하 또는 좌우방향으로 가압하여 베어링 하우징 등 말단 성형부의 외부를 단조성형시킨다. 이때, 금형틀내부로 금속유동이 일어나 살채우기를 하게 되며, 살채우기를 하고 남는 여분의 덧살이 금형 접합부를 통하여 외부로 밀려나온다.Forging (S50) of the end forming portion provided with the preforming portion is a press forging step of pressing the preforming portion with a press to form the end forming portion. The preforming portion maintaining the high temperature between the upper mold and the lower mold provided in the press is positioned And presses in the axial direction of the bar-like member 10 in the axial direction. That is, the outer periphery of the end forming portion such as the bearing housing is forged by pressurizing the mold vertically or horizontally. At this time, a metal flow occurs inside the mold frame to fill the mold, and the extra filler remaining after filling is pushed out through the mold joint.

트리밍 단계(S60)는 상기 말단성형부 단조성형(S50) 단계에서 외부로 밀려나온 덧살을 제거하는 공정이다. 덧살이 제거된 말단성형부는 완성품의 외부윤곽을 갖게 된다.The trimming step S60 is a step of removing the extruded portion pushed out in the forging step S50 of the end forming portion. The end-forming part from which the recess is removed has the outer contour of the finished product.

상기 트리밍 단계(S60)에서 덧살이 제거된 말단 성형부는 중심부에 프레스 성형으로 관통공을 형성시키는 피어싱 단계(S70)를 거치며, 상기 피어싱 단계에서 (S70) 비로서 완성된 말단성형부의 형상을 갖추게 된다. 말단성형부에 베어링이 장착되는 경우에 형성된 관통공은 베어링의 외륜이 장착되는 베어링 하우징이 된다.In the trimming step (S60), the end forming unit having the recessed portion is subjected to a piercing step (S70) for forming a through hole by press molding at the central part, and the shape of the finished end forming unit is obtained in the piercing step (S70) . The through hole formed when the bearing is mounted on the end forming portion becomes a bearing housing on which the outer ring of the bearing is mounted.

이와 같이, 한쪽에 말단성형부를 갖는 봉상체 제조방법은 피어싱 단계(S70)로 종료되지만, 실시예에서와 같이 양쪽 말단부에 베어링 하우징을 커넥팅 로드는 한쪽의 피어싱 단계(S70)까지 끝나면, 다른 쪽의 베어링 하우징을 성형시키기 위하여 가열구간 가열단계(S30)로 되돌려 보내어 진다(S80). As described above, the method of manufacturing the bar having one end forming portion ends with the piercing step (S70). However, when the connecting rod is connected to both end portions of the connecting rod by the piercing step (S70) And is returned to the heating section heating step S30 for forming the bearing housing (S80).

한 쪽의 베어링 하우징이 완성되어 반제품 상태로 가열단계(S30)로 되돌려진 커넥팅 로드는 다른 쪽의 말단부에 말단성형부, 즉, 베어링 하우징을 단조성형시키기 위하여 상술한 가열구간 가열단계(S30) 내지 피어싱 단계(S70)의 공정을 다시 거쳐서 양단에 말단성형부, 즉, 베어링 하우징을 단조성형시킨 커넥팅 로드의 단조 완성품이 제조된다.The connecting rod having one bearing housing completed and returned to the heating step S30 in a semi-finished state is heated in the above-described heating section heating step (S30) to the above-mentioned heating section heating step for forging the end forming part, The process of the piercing step S70 is repeated to produce a forged finished part of a connecting rod in which the end forming part, that is, the bearing housing is forged at both ends.

이상과 같은 구성에 의하여, 말단부의 단조비가 큰 봉상체의 업셋 단조방법According to the above-described constitution, the upset forging method of a bar member having a large forging ratio of the distal end portion

10 : 봉상체 소재 20 : 유도 가열코일
D : 봉상체 직경 l 1 : 가열구간
lo : 비가열구간10: Rod material 20: Induction heating coil
D: diameter of bar body l 1 : heating zone
lo : non-heating section

Claims (2)

말단성형부를 갖는 봉상체 업셋 단조방법에 있어서,
단조비와 봉상체 소재의 직경을 고려하여 소재 말단부의 비가열 구간 및 가열구간의 길이를 정하는 설계단계와,
상기 봉상체 소재의 말단부로부터 적어도 봉상체 소재직경에 상당하는 길이의 구간을 상기 비가열 구간을 두고 상기 가열구간을 가열하는 단계와,
상기 봉상체 소재의 가열된 말단부를 축방향으로 따라 업셋타격하여 단조비를 적어도 1.7배까지 확대하는 1차 업셋 타격과, 1단계 업셋 타격이 실시된 상기 말단부의 단조비를 적어도 2.7배까지 확대하는 2차 업셋 타격과, 2단계 업셋 타격이 실시된 상기 말단부의 단조비를 적어도 3.4배까지 확대하는 3차 업셋 타격하여 업셋 예비성형부를 형성하는 단계와,
상기 업셋 예비성형부를 봉상체의 축방향의 가로방향으로 프레스로 가압하여 상기 말단 성형부를 형성하는 단계를 포함하는 말단성형부를 갖는 봉상체 업셋 단조방법.In a bar upset forging method having an end forming section,
A designing step of determining the length of the non-heating section and the heating section of the material end portion in consideration of the diameter of the forging material and the material of the bar,
A step of heating the heating section from a distal end of the rod-shaped material at least in a section of a length corresponding to the diameter of the rod-shaped body with the non-heated section;
A first upset striking step of increasing the monotonous ratio by at least 1.7 times by upset striking the heated end portion of the rod-shaped material along the axial direction; and a first upset striking step of increasing the monotony ratio of the end portion subjected to the first step upset striking to at least 2.7 times Forming the upset preformed portion by striking the second upset striking and striking the third upset to increase the forging ratio of the end portion subjected to the second step upset striking to at least 3.4 times;
And pressing the upset preformed portion in the axial transverse direction of the bar body to form the end forming portion. 청구항 1에 있어서,
상기 가열하는 단계는 상기 비가열 구간을 벗어나서 소정의 가열구간을 나선형 유도가열 코일내에 삽입하여 950 ~ 1000℃로 고주파 유도가열하는 것을 특징으로 하는 말단성형부를 갖는 봉상체 업셋 단조방법.
The method according to claim 1,
Wherein the heating step includes the step of introducing a predetermined heating section into the helical induction heating coil while the heating section is out of the non-heating section and inducing high-frequency induction heating at 950 to 1000 占 폚.
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Publication number Priority date Publication date Assignee Title
CN104972037A (en) * 2015-06-24 2015-10-14 陈文建 Forging technology used for improving surface quality of forge piece
CN104972036A (en) * 2015-06-24 2015-10-14 陈文建 Workpiece forging process

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JPS56151134A (en) * 1980-04-25 1981-11-24 Miyagawa Kinzoku Kogyo Kk Manufacture of punching and forming tool
KR960023176A (en) * 1994-12-30 1996-07-18 석진철 Chisel steel and its manufacturing method
KR0128005B1 (en) * 1995-03-08 1998-04-16 김창식 Material transfer device of forging machine
KR100824937B1 (en) * 2006-08-26 2008-04-28 주식회사 세우엠아이씨 Method for manufacturing chisel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104972037A (en) * 2015-06-24 2015-10-14 陈文建 Forging technology used for improving surface quality of forge piece
CN104972036A (en) * 2015-06-24 2015-10-14 陈文建 Workpiece forging process

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