KR20200053947A - Manufacturing method of hastelloy steel bolt - Google Patents

Manufacturing method of hastelloy steel bolt Download PDF

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Publication number
KR20200053947A
KR20200053947A KR1020180137493A KR20180137493A KR20200053947A KR 20200053947 A KR20200053947 A KR 20200053947A KR 1020180137493 A KR1020180137493 A KR 1020180137493A KR 20180137493 A KR20180137493 A KR 20180137493A KR 20200053947 A KR20200053947 A KR 20200053947A
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South Korea
Prior art keywords
bolt
manufacturing
head
hastelloy steel
screw
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KR1020180137493A
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Korean (ko)
Inventor
신태수
안규희
강종훈
김원섭
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주식회사 태정기공
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Priority to KR1020180137493A priority Critical patent/KR20200053947A/en
Publication of KR20200053947A publication Critical patent/KR20200053947A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • 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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/08—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/007—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding buttons, nail heads, screw heads, bottle capsules or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/04—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of metal, e.g. skate blades

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

Abstract

The present invention relates to a method for manufacturing bolts of Hastelloy steel. The method for manufacturing the bolts of Hastelloy steel of the present invention comprises the following steps of: getting a material by cutting a round bar made of the Hastelloy steel containing nickel, chromium, cobalt, tungsten, molybdenum etc. to a predetermined length; locally heating one end unit of the cut material; forging the one end unit of the locally heated material in order to form a head of a bolt; turning the forged material; and getting a bolt, by rolling in cold rolling to form a thread on the outer circumference of one region of the other end unit of the turned material.

Description

하스텔로이강의 볼트 제조방법{MANUFACTURING METHOD OF HASTELLOY STEEL BOLT}Manufacturing method of Hastelloy steel {MANUFACTURING METHOD OF HASTELLOY STEEL BOLT}

본 발명은 하스텔로이강의 볼트 제조방법에 관한 것으로서, 보다 상세하게는, 볼트의 헤드 성형시 헤드 부분을 국부적으로 가열하여 단조 성형하는 하스텔로이강의 볼트 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a bolt of Hastelloy steel, and more particularly, to a method of manufacturing a bolt of Hastelloy steel for forging molding by locally heating the head portion when forming the head of the bolt.

일반적으로, 볼트는 봉 형상을 가지며, 볼트를 조이거나 풀 때 사용되며 육각형, 원통형, 사각형, 삼각형 등과 같은 다양한 형상을 갖는 볼트 머리 즉, 헤드와, 나사산들이 형성된 나사부와, 나사부와 헤드와의 사이의 봉부로 이루어진다.In general, the bolt has a rod shape, and is used to tighten or loosen the bolt, and has a variety of shapes such as hexagon, cylindrical, square, triangular, etc., that is, a head of a bolt, a thread formed with threads, and between the threaded portion and the head It is made of rods.

근래에는, 내부식성 및 고강도가 요구되는 항공기 부품, 보일러 부품 등에 사용하는 니켈, 크롬, 코발트, 텅스텐, 몰리브덴을 함유하는 하스텔로이강의 소재로 이루어진 볼트의 수요가 증대하고 있다.In recent years, there is an increasing demand for bolts made of Hastelloy steel materials containing nickel, chromium, cobalt, tungsten, and molybdenum for use in aircraft parts, boiler parts, etc., which require corrosion resistance and high strength.

한편, 볼트를 제조하는 방법으로서, 상온에서 단조를 하는 냉간 단조 방법과 일정 온도로 가열하여 단조를 하는 열간 단조 방법이 있다.On the other hand, as a method of manufacturing a bolt, there are a cold forging method for forging at room temperature and a hot forging method for heating and forging at a constant temperature.

냉간 단조는 상온에서 소성 가공을 하여 성형하는 단조 방법으로, 그 때문에 기존의 열간 단조와는 달리 가열에 의한 스케일 로스(scale loss)가 없거나, 제품의 가공 부분이 극히 소량이기 때문에 재료 회수율이 특히 좋은 특성을 가진다.Cold forging is a forging method that is molded by plastic working at room temperature.Therefore, unlike conventional hot forging, there is no scale loss due to heating, or because the processed part of the product is very small, the material recovery rate is particularly good. It has characteristics.

그리고, 냉간 단조는 사상 치수 정밀도가 우수하므로, 후공정의 기계 가공이 불필요하거나 또는 가공 공수가 대폭으로 저감되고, 소성 변형시의 가공 경화를 이용하여 저가의 재료를 열처리하지 않고 사용한다.In addition, since cold forging has excellent finishing dimensional accuracy, machining in a post-process is unnecessary, or the number of machining steps is drastically reduced, and low-cost materials are used without heat treatment by using work hardening during plastic deformation.

그러나, 이러한 냉간 단조를 통해 볼트를 제조할 경우 상온에서 단조 작업이 이루어지므로, 볼트의 단조 작업시 성형 불량이 발생하거나, 크랙이 발생하기 쉬워 볼트의 불량을 초래하는 문제점이 있다.However, when the bolt is manufactured through such cold forging, the forging operation is performed at room temperature, and thus, a molding defect occurs during the forging operation of the bolt, or cracks are easily generated, thereby causing a defect of the bolt.

또한, 냉간 단조 작업에 많은 힘이 소요되어 단조 작업이 용이하지 않을 뿐만 아니라 제조 시간이 길어져, 제조 생산성이 저하되는 문제점이 있다.In addition, it takes a lot of power for the cold forging operation, and not only the forging operation is not easy, but also has a problem in that manufacturing time is long and manufacturing productivity is deteriorated.

반면, 열간 단조를 통해 볼트를 제조할 경우, 열간 단조 작업은 소재 전체를 일정 온도 이상으로 가열하여 단조 성형함에 따라 단조 작업은 쉬워지지만, 소재가 불균일해져 조직의 불량을 초래할 염려가 있다.On the other hand, in the case of manufacturing a bolt through hot forging, the hot forging operation becomes easy as the forging operation is performed by heating the entire material to a predetermined temperature or higher, but the material may become non-uniform, resulting in defects in tissue.

즉, 열간 단조 작업의 경우, 성형은 용이하지만, 냉각 속도의 차이로 인해 볼트의 나사부의 조직 불량이 발생하여, 초정밀 나사 전조 또는 가공시 정밀도 저하로 인해, 나사 가공 문제와 금속 조직의 불균일로 인해 공구의 수명을 저하시키는 문제점이 있다.In other words, in the case of a hot forging operation, molding is easy, but due to a difference in the cooling rate, a defect in the threaded portion of the bolt occurs, resulting in a loss in precision during rolling or machining of a high-precision thread, due to a threading problem and non-uniformity of the metal structure There is a problem of reducing the life of the tool.

또한, 열간 단조 작업의 경우 소재 전체를 가열하여 단조 작업을 하므로, 전반적으로 제조 원가가 상승하는 문제점이 있다.In addition, in the case of a hot forging operation, since the entire material is forged by heating, there is a problem in that manufacturing cost is generally increased.

이에 따라, 본 출원인은 볼트 제조방법을 개선하여, 내부식성 및 고강도가 요구되는 항공기 부품, 보일러 부품 등에 사용하는 니켈, 크롬, 코발트, 텅스텐, 몰리브덴을 함유하는 하스텔로이강의 볼트를 제조하는 방법을 개발하기에 이르렀다.Accordingly, the applicant has developed a method for manufacturing bolts of Hastelloy steel containing nickel, chromium, cobalt, tungsten, and molybdenum used in aircraft parts, boiler parts, etc., by improving the bolt manufacturing method and requiring corrosion resistance and high strength. I came to Hagi.

국내공개특허공보 제10-2010-0034658호Korean Patent Publication No. 10-2010-0034658 국내등록특허공보 제10-0873377호Korean Registered Patent Publication No. 10-0873377

본 발명은 상기한 문제점을 해결하기 위한 것으로서, 성형이 용이할 뿐만 아니라 나사부의 정밀 가공이 용이하고, 재료의 손실을 줄이며 신속하게 제조할 수 있어 제조 원가를 절감하고, 생산성을 향상시킬 수 있는 하스텔로이강의 볼트 제조방법을 제공하는 것을 목적으로 한다.The present invention is to solve the above problems, as well as easy molding, the precision processing of the threaded portion is easy, it is possible to reduce the loss of material and can be quickly produced to reduce manufacturing costs and improve productivity. An object of the present invention is to provide a method for manufacturing a bolt of stelloy steel.

본 발명의 목적은, 하스텔로이강으로 이루어진 환봉을 일정 길이로 커팅하여, 소재를 얻는 단계; 커팅된 상기 소재의 일단부를 국부적으로 가열하는 단계; 상기 국부적으로 가열된 상기 소재의 일단부를 볼트의 헤드가 형성되도록 단조 성형하는 단계; 단조 성형된 상기 소재를 선삭 가공하는 단계; 및 선삭 가공된 상기 소재의 타단부의 일 영역의 외주에 나사부를 형성하도록 냉간에서 롤링하며 나사 전조하여, 볼트를 얻는 단계를 포함하는, 하스텔로이강의 볼트 제조방법에 의해 달성될 수 있다.The object of the present invention is to cut a round bar made of Hastelloy steel to a certain length to obtain a material; Locally heating one end of the cut material; Forging the one end of the locally heated material to form a head of a bolt; Turning the forged molded material; And rolling and screw rolling in cold so as to form a thread on the outer circumference of a region of the other end of the turning-processed material, thereby obtaining a bolt, which can be achieved by a bolt manufacturing method of Hastelloy steel.

여기서, 커팅된 상기 소재의 일단부를 국부적으로 가열하는 단계는 1150℃∼1200℃에서 행해질 수 있다.Here, the step of locally heating one end of the cut material may be performed at 1150 ° C to 1200 ° C.

또한, 상기 나사 전조하는 단계에서, 상기 나사 전조 압력은 130∼160kgf/cm2 범위 내에서 행해질 수 있다.In addition, in the screw rolling step, the screw rolling pressure may be performed within a range of 130 to 160 kgf / cm2.

그리고, 커팅된 상기 소재의 일단부를 국부적으로 가열하는 단계는 인덕션 히터에 의해 가열처리될 수 있다.Then, the step of locally heating one end of the cut material may be heat-treated by an induction heater.

본 발명에 따르면, 소재의 헤드 영역을 국부적으로 가열하여 볼트의 헤드를 단조 성형하고, 나사부를 냉간에서 나사 전조함으로써, 성형이 용이할 뿐만 아니라 나사부의 정밀 가공이 용이하고, 재료의 손실을 줄이며 신속하게 제조할 수 있어 제조 원가를 절감하고, 생산성을 향상시킬 수 있다.According to the present invention, the head region of the material is locally heated to forge the head of the bolt, and the thread is cold rolled, so that not only is it easy to mold, but also the precision processing of the thread is easy, reducing material loss and rapid As it can be manufactured, it is possible to reduce manufacturing costs and improve productivity.

도 1은 본 발명에 따른 하스텔로이강의 볼트 제조방법의 순서도,
도 2는 본 발명에 따른 하스텔로이강의 볼트 제조 과정을 도시한 도면이다.1 is a flow chart of a method for manufacturing a bolt of Hastelloy steel according to the present invention,
2 is a view showing a bolt manufacturing process of Hastelloy steel according to the present invention.

이하, 첨부 도면들을 참조하여 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1에는 본 발명에 따른 하스텔로이강의 볼트 제조방법의 순서도가 도시되어 있고, 도 2에는 본 발명에 따른 하스텔로이강의 볼트 제조 과정을 도시한 도면이 도시되어 있다.1 is a flowchart of a method for manufacturing a bolt of Hastelloy steel according to the present invention, and FIG. 2 is a diagram showing a process of manufacturing a bolt of Hastelloy steel according to the present invention.

본 발명에 따른 하스텔로이강의 볼트 제조방법을 설명하기에 앞서, 이하에서 하스텔로이강이라 함은 니켈, 크롬, 코발트, 텅스텐, 몰리브덴 등을 함유하는 강을 말함을 미리 밝혀둔다.Prior to explaining the bolt manufacturing method of the Hastelloy steel according to the present invention, it is revealed below that the Hastelloy steel refers to a steel containing nickel, chromium, cobalt, tungsten, molybdenum, and the like.

또한, 도 2의 (b)에 도시된 바와 같이, 볼트(100)는 일정 길이를 가지며, 봉 형상의 봉부(110)와, 봉부(110)의 일 영역에 나사산들이 형성된 나사부(115)와, 볼트(100)의 머리를 이루는 헤드(120)로 이루어진다.In addition, as shown in Figure 2 (b), the bolt 100 has a predetermined length, the rod-shaped rod portion 110, and the thread portion 115 is formed with threads on one region of the rod portion 110, It consists of a head 120 forming the head of the bolt 100.

봉부(110)와 나사부(115)는 동일 직경을 가지며, 헤드(120)는 봉부(110)와 나사부(115)에 비해 상대적으로 큰 직경을 가진다.The rod portion 110 and the screw portion 115 have the same diameter, and the head 120 has a relatively large diameter compared to the rod portion 110 and the screw portion 115.

또한, 본 실시예에서는 봉부(110)의 일 영역에 나사부(115)가 형성되어 있는 것으로 도시되어 있지만 이에 한정되지 않고, 봉부(110)의 전체 길이에 걸쳐 나사부(115)가 형성될 수도 있다.In addition, in the present embodiment, although it is illustrated that the threaded portion 115 is formed in one region of the rod portion 110, the present invention is not limited thereto, and the threaded portion 115 may be formed over the entire length of the rod portion 110.

본 발명에 따른 하스텔로이강의 볼트 제조방법은 소재 커팅 단계, 국부 가열하는 단계, 단조 성형 단계, 선삭 가공 단계, 나사 전조하여 볼트(100)를 얻는 단계를 포함한다.The method for manufacturing bolts of Hastelloy steel according to the present invention includes a material cutting step, a local heating step, a forging forming step, a turning process, and a screw rolling to obtain the bolt 100.

이하, 각 단계별로 상세히 설명한다.Hereinafter, each step will be described in detail.

먼저, 소재 커팅 단계는, 도 2의 (a)에 도시된 바와 같이, 환봉을 일정 길이로 절단하여 소재(10)를 얻는다(S10).First, the material cutting step, as shown in Figure 2 (a), by cutting the round bar to a certain length to obtain a material (10) (S10).

다음, 국부 가열 단계는. 커팅된 소재(10)의 일단부를 예컨대, 소재(10)의 헤드 성형부(20)를 국부적으로 가열한다(S20).Next, the local heating step. One end of the cut material 10 is locally heated, for example, the head forming part 20 of the material 10 (S20).

소재(10)의 헤드 성형부(20)를 국부 가열할 때, 히터(미도시)의 가열범위를 소재(10)의 헤드 성형부(20)의 외주에 설정한 후, 히터를 가열하여 소재(10)의 헤드 성형부(20)를 국부적으로 가열한다.When the head forming part 20 of the material 10 is locally heated, the heating range of the heater (not shown) is set to the outer periphery of the head forming part 20 of the material 10, and then the heater is heated to heat the material ( The head forming part 20 of 10) is locally heated.

한편, 소재(10)의 헤드 성형부(20)는 1150℃∼1200℃에서 국부적으로 가열하는 것이 바람직하다.On the other hand, the head forming part 20 of the material 10 is preferably locally heated at 1150 ° C to 1200 ° C.

소재(10)의 헤드 성형부(20)를 1150℃미만에서 국부적으로 가열하게 되면, 볼트(100)의 헤드(120)의 단조 성형성이 악화되어 미성형 및 성형 불량이 발생하게 된다.When the head forming part 20 of the material 10 is locally heated at less than 1150 ° C., the forging formability of the head 120 of the bolt 100 deteriorates, resulting in unforming and poor molding.

또한, 소재(10)의 헤드 성형부(20)를 1200℃를 초과하여 국부적으로 가열하게 되면, 소재의 용융온도를 넘어서기 때문에 소재가 용융상재 직전에 이르게 되어 성형이 어렵다In addition, when the head forming part 20 of the material 10 is locally heated in excess of 1200 ° C, the melting temperature of the material is exceeded, so that the material reaches immediately before the molten material, making molding difficult.

소재(10)의 헤드 성형부(20)의 가열이 완료되면, 가열된 소재(10)를 볼트(100)의 헤드(120)를 성형하기 위한 다이스(미도시)로 이동시켜, 가열된 소재(10)의 헤드 성형부(20)를 펀치(미도시)로 프레싱하여, 단조 성형한다(S30).When the heating of the head forming part 20 of the material 10 is completed, the heated material 10 is moved to a die (not shown) for forming the head 120 of the bolt 100, and the heated material ( The head forming part 20 of 10) is pressed with a punch (not shown), and forged forming (S30).

소재(10)의 헤드 성형부(20)를 단조 성형함에 따라, 소재(10)의 헤드 성형부(20)는 나사부(115) 및 봉부(110)에 비해 상대적으로 단면적이 큰 크기를 가지며, 볼트(100)의 헤드(120)를 형성한다.As the head forming part 20 of the material 10 is forged, the head forming part 20 of the material 10 has a larger cross-sectional area than the screw 115 and the rod 110, and bolts The head 120 of 100 is formed.

또한, 소재(10)의 헤드 성형부(20)를 국부적으로 가열한 후 단조 성형함에 따라, 금속 소재의 유동성이 증대되어 볼트(100)의 헤드(120)와 봉부(110) 사이에서 금속 소재의 단류선(금속 조직의 흐름)의 끊김없이 볼트(100)의 헤드(120)를 형성하게 된다. In addition, as the head forming part 20 of the material 10 is locally heated and then forged, the fluidity of the metal material increases, and the metal material between the head 120 and the rod 110 of the bolt 100 increases. The head 120 of the bolt 100 is formed without interruption of the current line (flow of the metal structure).

볼트(100)의 헤드(120)의 단조 성형이 완료되면, 단조 성형된 소재(10)를 선삭 가공한다(S40).When the forging of the head 120 of the bolt 100 is completed, the forged molded material 10 is turned (S40).

이어서, 선삭 가공된 소재(10)의 타단부의 일 영역의 외주에 나사부(115)를 형성하도록 냉간에서 롤링하며 나사 전조하여(S50), 도 2의 (b)에 도시된 바와 같이 하스텔로이강의 볼트(100)를 얻는다.Subsequently, by rolling in cold so as to form the thread 115 on the outer circumference of one region of the other end of the turning material 10 (S50), as shown in FIG. Bolt 100 is obtained.

한편, 나사 전조시의 압력은 볼트의 정도에 미치는 영향이 크므로, 나사 전조시의 압력 조절이 중요하다.On the other hand, since the pressure at the time of screw rolling has a large influence on the degree of bolt, it is important to adjust the pressure at the time of screw rolling.

따라서, 본 발명에 따른 하스텔로이강의 볼트 제조방법에 있어서, 나사 전조시 나사 전조 압력은 130∼160kgf/cm2 범위 내에서 행해지는 것이 바람직하다.Therefore, in the method for manufacturing bolts of Hastelloy steel according to the present invention, it is preferable that the screw rolling pressure is performed within a range of 130 to 160 kgf / cm2 during screw rolling.

나사 전조 압력이 130kgf/cm2 미만일 경우, 나사의 미성형을 포함한 체결 불량이 발생될 수 있다.When the screw rolling pressure is less than 130 kgf / cm2, a fastening failure may occur, including unforming the screw.

나사 전조 압력이 160kgf/cm2를 초과할 경우에는, 고가의 전조 다이스의 파손 및 수명 저하, 전조 제품의 버(burr) 발생을 포함한 외관 불량이 발생하게 된다. 또한, 설비의 주요 부품에도 과한 압력을 가하게 되어, 설비 소모품의 교체 주기 감소 및 설비정도 저하가 발생될 수 있다.When the screw rolling pressure exceeds 160 kgf / cm2, appearance defects including breakage and lifespan of an expensive rolling die and occurrence of burrs in a rolling product occur. In addition, excessive pressure is also applied to the main parts of the facility, which may reduce the replacement cycle of the facility consumables and decrease the facility accuracy.

한편, 나사 전조된 하스텔로이강의 볼트(100)를 필요에 따라 연삭 가공하여, 단조 성형 및 나사 전조시 해당 부위에 발생한 버어(burr)를 제거할 수도 있다. On the other hand, the bolt 100 of the screw-rolled Hastelloy steel may be ground as necessary to remove burrs generated in the corresponding part during forging molding and screw rolling.

이와 같이, 본 발명에 따르면, 소재의 헤드 영역을 국부적으로 가열하여 볼트의 헤드를 단조 성형하고, 나사부를 냉간에서 나사 전조함으로써, 성형이 용이할 뿐만 아니라 나사부의 정밀 가공이 용이하고, 재료의 손실을 줄이며 신속하게 제조할 수 있어 제조 원가를 절감하고, 생산성을 향상시킬 수 있게 된다.As described above, according to the present invention, the head region of the material is locally heated to forge the head of the bolt, and the thread is cold rolled, thereby facilitating molding as well as precision processing of the thread, and loss of material. It is possible to reduce the manufacturing cost quickly and reduce the manufacturing cost and improve productivity.

또한, 본 발명에 따라 제조되는 하스텔로이강의 볼트는 볼트의 헤드만을 국부적으로 가열한 후에 단조를 통해 제조됨으로써, 기계 가공에 의해 제조되는 볼트에 비해, 단류선(금속 조직의 흐름)을 끊김없이 유지시켜, 인성 및 내구강도 또한 증대된다.In addition, bolts of Hastelloy steel manufactured according to the present invention are manufactured through forging after only locally heating the head of the bolt, thereby maintaining a continuous break of the current line (flow of metal structure) compared to bolts produced by machining. By doing so, toughness and oral cavity are also increased.

한편, 본 실시예에서는 볼트의 헤드가 육각형의 단면형상을 갖는 것으로 도시되어 있지만 이에 한정되지 않고, 볼트의 헤드는 원통형, 사각형, 삼각형 등과 같은 다양한 형상을 가질 수 있다.On the other hand, in this embodiment, the head of the bolt is shown as having a hexagonal cross-sectional shape, but is not limited thereto, and the head of the bolt may have various shapes such as a cylinder, a square, and a triangle.

이상, 첨부된 도면을 참조로 하여 본 발명의 실시예를 설명하였지만, 본 발명이 속하는 기술 분야의 통상의 기술자는 본 발명이 그 기술적 사상이나 필수적인 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다. 그러므로, 이상에서 기술한 실시예들은 모든 면에서 예시적인 것이며, 제한적이 아닌 것으로 이해해야만 한다.The embodiments of the present invention have been described above with reference to the accompanying drawings, but a person skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing its technical spirit or essential features. You will understand. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive.

100 : 볼트
110 : 봉부
115 : 나사부
120 : 헤드100: bolt
110: rod
115: screw
120: head

Claims (4)

하스텔로이강으로 이루어진 환봉을 일정 길이로 커팅하여, 소재를 얻는 단계;
커팅된 상기 소재의 일단부를 국부적으로 가열하는 단계;
상기 국부적으로 가열된 상기 소재의 일단부를 볼트의 헤드가 형성되도록 단조 성형하는 단계;
단조 성형된 상기 소재를 선삭 가공하는 단계; 및
선삭 가공된 상기 소재의 타단부의 외주 일 영역에 나사부를 형성하도록 냉간에서 롤링하며 나사 전조하여, 볼트를 얻는 단계를 포함하는, 하스텔로이강의 볼트 제조방법.Cutting a round bar made of Hastelloy steel to a certain length to obtain a material;
Locally heating one end of the cut material;
Forging the one end of the locally heated material to form a head of a bolt;
Turning the forged molded material; And
A method of manufacturing a bolt of Hastelloy steel, comprising rolling a screw in cold to roll the screw to form a screw in an outer circumferential area of the other end of the material that has been turned. 제1항에 있어서,
커팅된 상기 소재의 일단부를 국부적으로 가열하는 단계는 1150℃∼1200℃에서 행해지는, 하스텔로이강의 볼트 제조방법.According to claim 1,
The step of locally heating one end of the cut material is performed at 1150 ° C to 1200 ° C, a method for manufacturing bolts of Hastelloy steel. 제1항에 있어서,
상기 나사 전조하는 단계에서, 상기 나사 전조 압력은 130∼160kgf/cm2 범위 내에서 행해지는, 하스텔로이강의 볼트 제조방법.According to claim 1,
In the screw rolling step, the screw rolling pressure is performed within a range of 130 to 160kgf / cm2, a method for manufacturing bolts of Hastelloy steel. 제1항 내지 제3항 중 어느 하나의 항에 있어서,
커팅된 상기 소재의 일단부를 국부적으로 가열하는 단계는 인덕션 히터에 의해 가열처리되는, 하스텔로이강의 볼트 제조방법.The method according to any one of claims 1 to 3,
The step of locally heating one end of the cut material is heat-treated by an induction heater, the method of manufacturing bolts of Hastelloy steel.
KR1020180137493A 2018-11-09 2018-11-09 Manufacturing method of hastelloy steel bolt KR20200053947A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112077339A (en) * 2020-09-17 2020-12-15 汤武义 Processing equipment of nasal cavity operation cutterbar dabber
CN112935732A (en) * 2021-03-11 2021-06-11 贵州航天新力科技有限公司 Preparation method of nickel-based alloy bolt

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100873377B1 (en) 2005-10-31 2008-12-11 홍성협 A method for manufacturing bolt and a forging apparatus therefor
KR20100034658A (en) 2008-09-24 2010-04-01 권승기 Knob manufacturing method in parallel cold heading and cutting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100873377B1 (en) 2005-10-31 2008-12-11 홍성협 A method for manufacturing bolt and a forging apparatus therefor
KR20100034658A (en) 2008-09-24 2010-04-01 권승기 Knob manufacturing method in parallel cold heading and cutting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112077339A (en) * 2020-09-17 2020-12-15 汤武义 Processing equipment of nasal cavity operation cutterbar dabber
CN112935732A (en) * 2021-03-11 2021-06-11 贵州航天新力科技有限公司 Preparation method of nickel-based alloy bolt

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