KR20190071313A - Hard cast alloy bolts and their manufacturing methodsod - Google Patents
Hard cast alloy bolts and their manufacturing methodsod Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 60
- 239000000956 alloy Substances 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title abstract description 19
- 238000002844 melting Methods 0.000 claims abstract description 34
- 230000008018 melting Effects 0.000 claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000005275 alloying Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000000265 homogenisation Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 4
- 238000005520 cutting process Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000005303 weighing Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910001347 Stellite Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical group 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/36—Thread cutting; Automatic machines specially designed therefor by grinding
- B23G1/38—Thread cutting; Automatic machines specially designed therefor by grinding with grinding discs guided along the workpiece in accordance with the pitch of the required thread
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/20—Arc remelting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
Description
본 발명은 경질주조합금 볼트 및 그 제조방법에 관한 것으로, 더욱 상세하게는 일련적인 단계를 통해서 경질주조합금 볼트를 제조할 수 있도록 하는 경질주조합금 볼트 및 그 제조방법에 관한 것이다.
The present invention relates to a light cast alloy bolt and a method of manufacturing the same, and more particularly, to a light cast alloy bolt capable of manufacturing a light cast alloy bolt through a series of steps, and a method of manufacturing the same.
일반적으로 경질주조합금은 Co-Cr-W계의 코발트 합금을 통칭하는 스텔라이트이다.Generally, hard cast alloys are stellite, which is a cobalt alloy of Co-Cr-W system.
이러한 경질주조합금의 주성분인 코발트는 주기율표 9족 4주기에 속하는 철족원소로 원소기호는 Co, 원자량 58.933g/mol, 녹는점 1495, 끓는점 2927, 밀도 8.90g/cm3이다. Cobalt, which is the main component of these hard cast alloys, is an iron family element belonging to the 4th cycle of Group 9 of the periodic table and has an elemental symbol of Co, an atomic weight of 58.933 g / mol, a melting point of 1495, a boiling point of 2927 and a density of 8.90 g /
특히 철과 비슷한 광택이 나는 전이금속으로 옛날에는 도자기나 유리 등에 푸른색을 내는 화합물로서 알려져 있다. In particular, it is a transition metal that is similar to iron and has long been known as a blue coloring compound for ceramics and glass.
또한, 고속도강 및 영구자석 등의 자성재료 및 내열 내식강 등으로 사용하며, 비철 합금으로서 고온에서 내산화성, 내식성, 내마모성 등과 같은 기계적 성질 등이 뛰어나다.In addition, it is used for magnetic materials such as high-speed steel and permanent magnets and heat-resistant corrosion resistant steel. It is excellent in mechanical properties such as oxidation resistance, corrosion resistance and abrasion resistance at high temperature.
또, 내열성이 강하고 600℃에서도 경도의 저하를 나타내지 않으며 탄소를 함유한 특히 경질의 것은 절삭 공구 재료로 사용된다. In addition, it has a strong heat resistance and does not show a decrease in hardness even at 600 ° C, and a particularly hard material containing carbon is used as a cutting tool material.
그러나 경질주조합금은 매우 경질이어서 단조나 기계적 가공이 어려워 특성이 우수함에도 사용용도가 제한되는 문제를 갖게 되었다.However, since the hard cast alloy is very hard, it is difficult to forge or mechanically process it, and the use of the cast alloy is limited.
특히 경질주조합금은 주로 주조품으로만 사용되고 있는 한계를 갖게 되었다.In particular, hard cast alloys are limited to castings.
따라서 소재의 기능성 및 경제성의 관점에서 경질주조합금을 이용하여 모든 기계요소중 기초 부품으로 사용하는 볼트를 제조하는 기술이 절실한 실정이다.
Therefore, from the viewpoints of material functionality and economy, there is a need for a technique for manufacturing bolts for use as basic parts of all mechanical elements by using hard cast alloys.
따라서 본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출한 것으로서,SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,
본 발명은 경질주조합금을 이용하여 고온특성이 우수하고 내마모성이 탁월한 볼트를 제조할 수 있는 경질주조합금 볼트 및 그 제조방법을 제공함에 목적이 있다.An object of the present invention is to provide a hard cast alloy bolt capable of producing a bolt having excellent high-temperature characteristics and excellent abrasion resistance by using a hard cast alloy and a method of manufacturing the same.
특히 본 발명은 합금 원소의 정확한 중량과 진공 유도 용해를 이용한 볼트의 기본 형상을 주조하고 연삭 가공을 이용하여 나사산을 가공함으로써 경질 주조 합금 볼트를 제조할 수 있는 경질주조합금 볼트 및 그 제조방법을 제공함에 다른 목적이 있다.
Particularly, the present invention provides a hard cast alloy bolt capable of producing a hard cast alloy bolt by casting a basic shape of a bolt using an accurate weight of an alloy element and a vacuum induction melting and machining a thread using grinding, and a method of manufacturing the same. There is another purpose in.
상기한 목적을 달성하기 위한 본 발명 경질주조합금 볼트 및 그 제조방법은,According to an aspect of the present invention, there is provided a hard cast alloy bolt and a method of manufacturing the same,
합금 원소를 혼합하는 제1단계, A first step of mixing the alloying elements,
고융점 합금 원소의 용해온도를 낮추기 위한 모합금을 제조하는 제2단계, A second step of producing a master alloy for lowering the melting temperature of the high melting point alloy element,
상기 제1단계와 제2단계를 통해서 혼합한 합금 원소 및 제조한 모합금을 주조하는 제3단계, A third step of casting the alloy element mixed and the mother alloy produced through the first and second steps,
상기 제3단계에서 주조한 주조물을 열처리하는 제4단계,A fourth step of heat-treating the cast material cast in the third step,
상기 4단계에서 열처리한 주조물을 나사 가공하는 제5단계로 이루어지는 것을 특징으로 한다.And a fifth step of screwing the cast material heat-treated in step 4 above.
여기서 상기 제1단계에서 합금 원소는 Co 45.5중량부, Cr 32중량부, W 13중량부, Fe 3중량부, Ni 3중량부, C 2.5중량부, Si 1중량부로 이루어지는 것을 특징으로 한다.In the first step, the alloy element is composed of 45.5 parts by weight of Co, 32 parts by weight of Cr, 13 parts by weight of W, 3 parts by weight of Fe, 3 parts by weight of Ni, 2.5 parts by weight of C and 1 part by weight of Si.
또한, 상기 제2단계는 Co, Cr, W의 고융점 합금 원소를 진공 아크 용해로의 내부에 장입하고 진공 상태를 유지한 후 아크열을 이용하여 제조하는 것을 특징으로 한다.In the second step, the high melting point alloy element of Co, Cr, and W is charged into the vacuum arc melting furnace and maintained in a vacuum state, followed by arc heat treatment.
특히 상기 제3단계는 진공 아크 용해로를 이용하며 진공 아크 용해로의 내부에 도가니를 장착하고 합금 원소를 도가니의 내부에 장입하며 진공 아크 용해로의 진공도는 6.0×10-2Torr 미만이 되도록 이루어지는 것을 특징으로 한다.Particularly, in the third step, a vacuum arc melting furnace is used, a crucible is mounted in a vacuum arc melting furnace, and the alloy element is charged into the crucible, and the degree of vacuum of the vacuum arc melting furnace is less than 6.0 × 10 -2 Torr do.
한편, 상기 제4단계는 카본 발열체 진공로를 이용하여 10 내지 50℃에서 24시간 동안 균질화 열처리하는 것을 특징으로 한다.Meanwhile, the fourth step is characterized in that the homogenization heat treatment is performed at 10 to 50 ° C for 24 hours by using a carbon heating element vacuum furnace.
아울러 상기 제5단계는 나사의 피치와 동일한 형상을 갖도록 형성한 연삭기를 이용하여 주조물의 외경에 접촉시키고 연삭기를 회전과 동시에 일측으로 이송시켜 주조물의 외경에 나사를 가공하는 것을 특징으로 한다.
In the fifth step, the grinding machine is brought into contact with the outer diameter of the casting using a grinding machine having the same shape as the pitch of the screw, and the grinding machine is transferred to one side at the same time as the grinding machine is rotated to process the outer diameter of the casting.
본 발명은 경질주조합금을 이용하여 고온특성이 우수하고 내마모성이 탁월한 볼트를 제조할 수 있는 효과를 갖는다.The present invention has the effect of producing a bolt having excellent high temperature characteristics and excellent abrasion resistance by using a hard cast alloy.
특히 본 발명은 합금 원소의 정확한 중량과 진공 유도 용해를 이용한 볼트의 기본 형상을 주조하고 연삭 가공을 이용하여 나사를 가공하여 생산효율을 향상할 수 있는 효과를 갖는다.Particularly, the present invention has the effect of improving the production efficiency by casting the basic shape of the bolt using the precise weight of the alloy element and the vacuum induction melting and machining the screw using the grinding process.
또한, 본 발명은 구조가 간단하고 유지보수가 용이하여 사용효율은 물론 활용범위를 극대화할 수 있는 효과를 갖는다.
In addition, the present invention has a simple structure and easy maintenance, thereby maximizing utilization efficiency as well as utilization efficiency.
도 1은 본 발명 경질주조합금 볼트 및 그 제조방법의 제조 단계를 나타내기 위한 순서도.
도 2는 본 발명에서 나사의 연삭 과정을 나타내기 위한 참고도.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing steps of manufacturing a hard cast alloy bolt of the present invention and a method of manufacturing the same. FIG.
FIG. 2 is a reference view for illustrating a grinding process of a screw in the present invention. FIG.
상기한 바와 같은 본 발명의 목적을 달성하기 위한 기술적 구성을 첨부한 도면에 의해 더욱 상세히 설명하면 다음과 같다.Technical features of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명 경질주조합금 볼트 및 그 제조방법의 제조 단계를 나타내기 위한 순서도이고, 도 2는 본 발명에서 나사의 연삭 과정을 나타내기 위한 참고도를 도시한 것이다.FIG. 1 is a flow chart showing a manufacturing step of a hard cast alloy bolt of the present invention and a method of manufacturing the same. FIG. 2 is a reference view showing a grinding process of a screw in the present invention.
본 발명 경질주조합금 볼트 및 그 제조방법은,A hard cast alloy bolt and a method of manufacturing the same,
합금 원소를 혼합하는 제1단계, A first step of mixing the alloying elements,
고융점 합금 원소의 용해온도를 낮추기 위한 모합금을 제조하는 제2단계, A second step of producing a master alloy for lowering the melting temperature of the high melting point alloy element,
상기 제1단계와 제2단계를 통해서 혼합한 합금 원소 및 제조한 모합금을 주조하는 제3단계, A third step of casting the alloy element mixed and the mother alloy produced through the first and second steps,
상기 제3단계에서 주조한 주조물을 열처리하는 제4단계,A fourth step of heat-treating the cast material cast in the third step,
상기 4단계에서 열처리한 주조물을 나사 가공하는 제5단계로 이루어진다.And a fifth step of screwing the cast material heat-treated in step 4 above.
본 발명에서 상기 제1단계는 각 합금 원소를 중량부로 혼합하며 상대적으로 많은 원소인 Co와 Cr은 괴 형태로 구입하고 나머지 합금 원소들은 얇은 편 형태로 구입하여 중량부에 따라서 일정크기로 절단하여 사용한다.In the present invention, the first step is to mix each alloy element by weight, and the relatively large amount of elements, such as Co and Cr, are purchased in bulk form. The remaining alloying elements are purchased in the form of thin pieces, do.
이때 상기 각 합금 원소는 Co 45.5중량부, Cr 32중량부, W 13중량부, Fe 3중량부, Ni 3중량부, C 2.5중량부, Si 1중량부로 이루어진다.Each of the alloying elements comprises 45.5 parts by weight of Co, 32 parts by weight of Cr, 13 parts by weight of W, 3 parts by weight of Fe, 3 parts by weight of Ni, 2.5 parts by weight of C and 1 part by weight of Si.
특히 합금 원소는 이물질이 첨가되지 않도록 주의하여 별도의 용기에 넣어 보관한다.In particular, the alloy element should be kept in a separate container with care not to add any foreign substance.
본 발명에서 상기 제2단계는 고융점 합금 원소를 용이하게 용해할 수 있도록 사전작업을 진행하기 위한 단계로, 다른 합금 원소보다 상대적으로 고융점인 원소 W, Cr, Co를 사전에 합금화하여 용해온도를 낮추는 것이다. In the present invention, the second step is a step for carrying out a preliminary work so as to easily dissolve the high-melting-point alloy element, and alloying the elements W, Cr and Co having relatively higher melting point than other alloying elements in advance, .
이를 위해 진공 아크 용해로를 이용하여 6,000℃ 이상의 고온을 발생시켜 고융점 합금 원소를 용해하여 모합금으로 제조할 수 있다. For this purpose, a high temperature of 6,000 ° C or higher is generated by using a vacuum arc melting furnace to dissolve the high melting point alloying element, and the master alloy can be produced.
이렇게 모합금을 제조할 경우 합금의 용해온도는 현저히 떨어져 용해를 쉽게 진행할 수 있는 합금으로 변하여 주조 공정이 쉬워진다.When the mother alloy is manufactured, the melting temperature of the alloy is remarkably reduced, and the alloy is converted into an alloy which can easily dissolve and the casting process becomes easy.
본 발명에서 상기 제3단계는 진공 아크 용해로로의 가동을 위한 준비부터 시작한다. In the present invention, the third step starts with preparations for operation of the vacuum arc furnace.
먼저, 진공 아크 용해로의 내부에 도가니를 장착하고 합금 원소의 혼합물을 도가니 내에 장입한다. First, a crucible is mounted inside a vacuum arc melting furnace, and a mixture of alloy elements is charged into the crucible.
이때 융점이 합금 원소를 먼저 장입하고 반응성이 높은 합금 원소를 도가니 중심부에 장입한다. At this time, the alloying element is charged first and the highly reactive alloy element is charged into the center of the crucible.
여기서 덩어리가 합금 원소는 도가니에 간섭 또는 걸리지 않도록 주의한다.Note here that the alloy elements do not interfere with or catch on the crucible.
다음으로 장입이 끝나면 진공 아크 용해로를 폐쇄하고 디피젼 펌프를 가동하여 진공 아크 용해로의 내부를 진공화시킨다. Next, when charging is completed, the vacuum arc melting furnace is closed and the vacuum pump is operated to evacuate the inside of the vacuum arc melting furnace.
이때 진공 아크 용해로의 진공도는 6.0×10-2Torr 미만이 되도록 유지한다.At this time, the vacuum degree of the vacuum arc melting furnace is kept to be less than 6.0 × 10 -2 Torr.
그리고 진공 아크 용해로의 내부가 원하는 진공상태가 되면 유도 코일에 전력을 공급하여 용해를 시작한다. When the inside of the vacuum arc melting furnace is in a desired vacuum state, electric power is supplied to the induction coil to start melting.
이때 작업자는 투시창을 이용하여 합금 원소의 용해상태를 수시로 확인하여 예열된 주형을 진공 아크 용해로의 내부로 투입한다.At this time, the operator checks the dissolution state of the alloying element at any time using a through window, and inserts the preheated mold into the vacuum arc melting furnace.
여기서 주형의 예열은 800℃ 이상에서 30분 이상 예열한다.The preheating of the mold is performed at 800 ° C or more for 30 minutes or more.
그런 후 합금 원소가 용해상태가 되면 도가니를 기울여 주형에 용탕을 주입한다. Then, when the alloy element is dissolved, the molten metal is injected into the mold by inclining the crucible.
이때 용탕이 넘치지 않도록 주의해야 한다. At this time, be careful not to overflow the molten metal.
특히 상기 용탕은 주형의 밑바닥부터 차 올라오게 설계되어 있으나 작업상의 부주의로 기포나 주조 불량이 발생할 수 있으므로 세심한 주의가 필요하다. Particularly, the above-mentioned molten metal is designed to rise from the bottom of the mold, but bubbles or casting defects may occur due to carelessness in operation, so care must be taken.
여기서 주입이 끝난 주형은 진공 아크 용해로의 내부에서 냉각을 시키며 용탕이 서서히 응고되도록 해야한다. Here, the injection mold should be cooled inside the vacuum arc melting furnace and the molten metal should be gradually solidified.
그리고 급속한 응고는 주조 결함과 성분의 편석을 초래할 수 있으므로 주조품이 400℃ 미만으로 떨어지면 진공 아크 용해로의 외부로 꺼내어 공랭시켜도 무방하다. Rapid solidification can lead to casting defects and component segregation, so if the casting falls below 400 ° C, it may be taken out of the vacuum arc melting furnace and air cooled.
한편, 상기 주형은 볼트의 형태가 형성되도록 마련한 상태로 다양한 규격 및 형태의 볼트를 제조할 수 있다.Meanwhile, the molds can be manufactured in various sizes and shapes in a state in which the shapes of the bolts are formed.
본 발명에서 상기 제4단계는 상기 제3단계에서 주조한 주조물에 대하여 가공 전에 미세한 주조결함을 제거하고 조직학적으로 내부에 발생된 응력을 줄이며 국부적인 화학성분의 불균일과 응고속도의 차이에 의한 성분 편석을 제거하기 위해 카본 발열체 진공로를 이용하여 균질화 열처리 실시한다. In the fourth step of the present invention, the casting mold cast in the third step is subjected to removal of fine casting defects before machining, to reduce the stress generated in the interior of the casting mold, and to reduce the stress caused by local variations in the chemical composition and the coagulation speed In order to remove segregation, homogenization heat treatment is performed using a carbon heating element vacuum furnace.
여기서 상기 균질화 열처리는 카본 발열체 진공로를 이용함으로써 열처리 공정 중에 발생할 수 있는 산화에 대한 문제점을 방지하고 온도는 10 내지 50℃에서 24시간 동안 균질화 열처리를 실시한다. Here, the homogenization heat treatment uses a carbon heating element vacuum furnace to prevent oxidation problems that may occur during the heat treatment process, and the homogenization heat treatment is performed at a temperature of 10 to 50 캜 for 24 hours.
이때 카본 발열체 진공로의 가열체는 graphite, 열전대는 C type이며, 진공도는 3×10-4torr이하로 설정한다. In this case, the heating element of the carbon heating element vacuum furnace is graphite, the thermocouple is of the C type, and the degree of vacuum is set to 3 × 10 -4 torr or less.
본 발명에서 상기 제5단계는 나사의 피치와 동일한 형상을 갖도록 형성한 연삭기를 이용하여 주조물의 외경에 접촉시키고 연삭기를 회전과 동시에 일측으로 이송시켜 주조물의 외경에 나사를 가공한다.In the fifth step, the grinding machine is brought into contact with the outer diameter of the casting using a grinding machine having the same shape as the pitch of the screw, and the grinding machine is transferred to one side at the same time as the rotation.
이때 상기 연삭기는 도 2에 도시한 바와 같이 나사의 피치와 동일한 형상을 갖는 다양한 넓이를 갖는 연삭 숫돌을 사용한다.At this time, as shown in FIG. 2, the grinding machine uses a grinding wheel having various widths having the same shape as the pitch of the screw.
이처럼 상기와 같이 본 발명의 실시예에 대하여 상세히 설명하였으나, 본 발명의 권리범위는 이에 한정되지 않으며, 본 발명의 실시예와 실질적으로 균등의 범위에 있는 구성까지 본 발명의 권리범위에 포함됨은 당연하다.Although the embodiments of the present invention have been described in detail, it is to be understood that the scope of the present invention is not limited to the disclosed embodiments. The scope of the present invention is not limited by the scope of the present invention. Do.
Claims (7)
고융점 합금 원소의 용해온도를 낮추기 위한 모합금을 제조하는 제2단계,
상기 제1단계와 제2단계를 통해서 혼합한 합금 원소 및 제조한 모합금을 주조하는 제3단계,
상기 제3단계에서 주조한 주조물을 열처리하는 제4단계,
상기 4단계에서 열처리한 주조물을 나사 가공하는 제5단계로 이루어지는 것을 특징으로 하는 경질주조합금 볼트 제조방법.A first step of mixing the alloying elements,
A second step of producing a master alloy for lowering the melting temperature of the high melting point alloy element,
A third step of casting the alloy element mixed and the mother alloy produced through the first and second steps,
A fourth step of heat-treating the cast material cast in the third step,
And a fifth step of screwing the cast material heat-treated in step 4 above.
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