KR20210146541A - Sintered body for a tip saw - Google Patents
Sintered body for a tip saw Download PDFInfo
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- KR20210146541A KR20210146541A KR1020200063440A KR20200063440A KR20210146541A KR 20210146541 A KR20210146541 A KR 20210146541A KR 1020200063440 A KR1020200063440 A KR 1020200063440A KR 20200063440 A KR20200063440 A KR 20200063440A KR 20210146541 A KR20210146541 A KR 20210146541A
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- sintered body
- tip
- sweating
- tip saw
- saw
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000035900 sweating Effects 0.000 claims abstract description 30
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 9
- 239000010941 cobalt Substances 0.000 claims abstract description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 abstract description 29
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000001000 micrograph Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 206010011906 Death Diseases 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000011195 cermet Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 2
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
- C22C1/0458—Alloys based on titanium, zirconium or hafnium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/02—Circular saw blades
- B23D61/04—Circular saw blades with inserted saw teeth, i.e. the teeth being individually inserted
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/20—Tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
- C22C2202/02—Magnetic
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
본 발명은 원형상의 몸체의 외주부에 다수의 팁 고착부가 형성되어 있는 쏘 바디(saw body)에 고착되는 절삭 팁의 제조에 사용되는 팁 쏘용 소결체에 관한 것으로, 보다 상세하게는 쏘 바디에 용접되었을 때 팁 쏘의 절삭 성능을 크게 향상시킬 수 있는 소결체에 관한 것이다.The present invention relates to a sintered body for a tip saw used for manufacturing a cutting tip fixed to a saw body having a plurality of tip fixing portions formed on the outer periphery of a circular body, and more particularly, when welded to the saw body It relates to a sintered body that can significantly improve the cutting performance of a tip saw.
팁 쏘(tip saw)는 도 4에 나타낸 것과 같이, 철계로 이루어진 원형의 블레이드(blade)의 외주부에 고경도 소결체로 이루어진 절삭 팁(tip)을 고착한 후 적절한 연삭작업을 거쳐 완성되는 절단용 공구이다.As shown in FIG. 4, the tip saw is a cutting tool that is completed through appropriate grinding after attaching a cutting tip made of a high hardness sintered body to the outer periphery of a circular blade made of iron. am.
팁 쏘에 고착되는 절삭 팁은 절단하는 피삭재에 맞춰 고경도 소결체가 선택되는데, 일반적으로 일반강의 절단에는 써멧(cermet) 소결체가 적용되고, 스테인리스(STS) 등의 난삭재용 절단에는 초경합금(cemented carbide) 소결체가 적용된다.A high-hardness sintered body is selected for the cutting tip adhered to the tip saw according to the workpiece being cut. In general, a cermet sintered body is applied for cutting general steel, and cemented carbide is used for cutting hard-to-cut materials such as stainless steel (STS). A sintered body is applied.
팁 쏘용 소결체가 고속 생산성과 우수 성능을 발휘하기 위해서는 고속가공에서 견딜 수 있는 내마모성과 안정적 절단작업을 수행할 수 있는 충분한 용접강도를 구현할 수 있는 우수한 용접성의 2가지 핵심요소가 필요하다.In order for the sintered body for tip saws to exhibit high-speed productivity and excellent performance, two key elements of excellent weldability that can withstand high-speed machining and sufficient welding strength for stable cutting are required.
통상, 팁 쏘 제작시 적용되는 용접공정은 브레이징(brazing) 공정이 적용되며, 이때 용접제(filler Metal)로는 은(Ag), 아연(Zn), 주석(Sn), 구리(Cu) 등이 포함된 조성물이 사용되고 있다.In general, a brazing process is applied to the welding process applied to the tip saw manufacturing, and the filler metal includes silver (Ag), zinc (Zn), tin (Sn), copper (Cu), etc. composition is used.
팁 쏘의 용접강도를 확보하기 위하여, 과거에는 쏘 바디와 소결체와의 용접성을 향상시키기 위해 소결체를 미리 도금하여 용접성을 향상시키는 방식이 사용되기도 하였고, 현재도 일부 적용되고 있다. 최근에는 소결체 제작시 바인더로 사용되는 코발트(Co), 니켈(Ni) 등의 금속을 소결체 외부에 존재시키는 스웨팅(sweating) 현상을 유발하여 표면에 다량으로 노출된 코발트(Co), 니켈(Ni) 등의 바인더 금속과 은(Ag), 아연(Zn) 등의 용접제에 포함되는 금속 간의 용융반응으로 별도의 도금 없이도 우수한 용접성을 확보할 수 있게 되어 생산비용을 줄일 수 있게 되었다.In order to secure the welding strength of the tip saw, in the past, in order to improve the weldability between the saw body and the sintered body, a method of improving the weldability by plating the sintered body in advance was used, and it is still partially applied. Recently, when producing a sintered body, metals such as cobalt (Co) and nickel (Ni), which are used as binders, cause a sweating phenomenon in which metals such as cobalt (Co) and nickel (Ni) exist outside the sintered body, and cobalt (Co) and nickel (Ni) exposed in large amounts on the surface ) and other metals included in the welding agent, such as silver (Ag) and zinc (Zn), to achieve excellent weldability without additional plating, thereby reducing production costs.
한편, 절단 피삭재가 난삭재화되고, 생산성 향상을 위한 고속, 고이송 절삭조건이 요구되면서 소결체는 초미립 고경도 물성이 필요한 실정이다. 그런데, 팁 쏘용 소결체의 특성을 향상시키는 2가지 핵심요소 중의 하나인 경도를 높이기 위하여, 소결체에 적용되는 경질원소의 입도를 줄일수록 대량생산 시에 균일한 스웨팅 현상을 얻기 어려워 경도와 용접성을 동시에 구현하는 것이 어려운 문제점이 있다.On the other hand, as the cutting material becomes difficult to cut and high-speed, high-feed cutting conditions are required to improve productivity, the sintered compact needs ultra-fine, high-hardness properties. However, in order to increase the hardness, which is one of the two key factors for improving the characteristics of the sintered body for a tip saw, as the particle size of the hard element applied to the sintered body is reduced, it is difficult to obtain a uniform sweating phenomenon during mass production, so that hardness and weldability are at the same time There is a problem that is difficult to implement.
또한, 하기 특허문헌에는 팁의 용접 강도를 향상시키기 위하여 팁의 용접 면적을 증대시키는 팁 형상에 대해 개시하고 있으나, 팁 형상 만으로는 팁 쏘의 절삭 수명을 향상시키는데 한계가 있으므로, 절삭 팁 자체의 경도를 향상시키면서 단위 용접 면적당 용접 강도를 향상시킬 필요가 있다.In addition, the following patent documents disclose a tip shape that increases the welding area of the tip in order to improve the welding strength of the tip, but since the tip shape alone has a limit in improving the cutting life of the tip saw, the hardness of the cutting tip itself is reduced. It is necessary to improve the welding strength per unit welding area while improving.
본 발명은 상술한 문제점을 해결하기 위해 창안된 것으로서, 그 목적은 팁 쏘에 용접되었을 때, 용접 강도를 현저하게 향상시킬 수 있을 뿐 아니라, 높은 경도를 가져, 팁 쏘의 절삭 성능을 현저하게 향상시킬 수 있는 팁 쏘용 소결체를 제공하는데 있다.The present invention has been devised to solve the above problems, and its object is to significantly improve welding strength when welded to a tip saw, as well as to have high hardness, significantly improving the cutting performance of the tip saw It is to provide a sintered body for a tip saw that can be used.
상기 목적을 달성하기 위해 본 발명은, Ti(C,N) 40 ~ 75중량%, 코발트(Co)와 니켈(Ni) 중에서 선택된 1종 또는 2종 혼합물 10 ~ 25중량%, 탄화텅스텐(WC) 10 ~ 25중량%를 포함하는 소결체로, 상기 소결체의 전체 표면 면적의 50% 이상에 스웨팅(sweating)이 형성되어 있고, 상기 스웨팅의 평균 두께가 1.0 ~ 4.0㎛인, 팁 쏘용 소결체를 제공한다.In order to achieve the above object, the present invention is Ti (C,N) 40 to 75 wt%, cobalt (Co) and nickel (Ni) 1 or 2 types of
본 발명에 따른 소결체는, 스웨팅 면적이 증대되어 팁 쏘에 용접되었을 때 용접강도를 현저하게 향상시킬 수 있을 뿐 아니라, 소결체의 경도가 높아, 우수한 절삭성능을 나타낸다.In the sintered compact according to the present invention, the sweating area is increased to remarkably improve the welding strength when welded to the tip saw, and the hardness of the sintered compact is high, thereby exhibiting excellent cutting performance.
본 발명의 효과는 이상에서 언급된 것들에 한정되지 않으며, 언급되지 아니한 다른 해결과제들은 이하의 기재로부터 당업자에게 명확하게 이해되어 질 수 있을 것이다.Effects of the present invention are not limited to those mentioned above, and other solutions not mentioned will be clearly understood by those skilled in the art from the following description.
도 1은 본 발명의 실시예 1 및 2에 따른 팁 쏘용 소결체의 표면 광학사진과, 표면 주사전자현미경(SEM) 이미지를 나타낸 것이다.
도 2는 비교예 1 ~ 3에 따른 팁 쏘용 소결체의 표면 광학사진과, 표면 주사전자현미경(SEM) 이미지를 나타낸 것이다.
도 3은 팁 쏘의 개략도와, 팁 쏘에 브레이징을 통해 용접되는 절삭 팁의 단면 상태를 나타낸 것이다.1 shows an optical photograph of the surface of a sintered body for a tip saw according to Examples 1 and 2 of the present invention, and a surface scanning electron microscope (SEM) image.
2 is an optical photograph of the surface of the sintered body for a tip saw according to Comparative Examples 1 to 3 and a surface scanning electron microscope (SEM) image.
Figure 3 shows a schematic view of a tip saw, and a cross-sectional state of a cutting tip that is welded through brazing to the tip saw.
이하 본 발명의 실시예에 대하여 첨부된 도면을 참고로 그 구성 및 작용을 설명하기로 한다. 하기에서 본 발명을 설명함에 있어, 관련된 공지 기능 또는 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략할 것이다. 또한, 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다.Hereinafter, the configuration and operation of the embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, when a part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.
본 발명에 있어서, '스웨팅(sweating)'란, 도 2에서 확인되는 것과 같이, 소결체의 소결과정에 소결체의 표면에 형성되는 결합제 금속으로 이루어지는 조직으로, 0.1㎛ 이상의 두께를 가지고 소결체를 구성하는 WC 단위 입자의 평균 면적에 비해 큰 면적을 가지는 표면 조직을 의미한다.In the present invention, 'sweating' is a structure made of a binder metal formed on the surface of the sintered body during the sintering process of the sintered body as confirmed in FIG. 2, and has a thickness of 0.1 μm or more It refers to a surface structure having a larger area than the average area of the WC unit particles.
또한, '스웨팅 면적'이란, 스웨팅에 대한 주사전자현미경 이미지로부터 측정된 면적을 의미한다.In addition, the 'sweating area' means an area measured from a scanning electron microscope image of the sweating.
또한, '스웨팅 두께'란, 스웨팅의 단면에 대한 주사전자현미경 이미지에서 가장 두께가 두꺼운 부분에서 측정된 두께를 의미한다.In addition, 'sweating thickness' means the thickness measured at the thickest part in the scanning electron microscope image of the cross section of the sweating.
본 발명에 따른 팁 쏘용 소결체는, Ti(C,N) 40 ~ 75중량%, 코발트(Co)와 니켈(Ni) 중에서 선택된 1종 또는 2종 혼합물 10 ~ 25중량%, 탄화텅스텐(WC) 10 ~ 25중량%를 포함하고, 상기 소결체의 전체 표면 면적의 50% 이상에 스웨팅(sweating)이 형성되어 있고, 상기 스웨팅의 평균 두께가 1.0 ~ 4.0㎛ 인 것을 특징으로 한다.The sintered compact for a tip saw according to the present invention, Ti (C,N) 40 ~ 75% by weight, cobalt (Co) and nickel (Ni) 10 ~ 25% by weight of a mixture of one or two types selected from, tungsten carbide (WC) 10 It contains ~ 25% by weight, sweating (sweating) is formed on 50% or more of the total surface area of the sintered body, it is characterized in that the average thickness of the sweating is 1.0 ~ 4.0㎛.
상기 Ti(C,N)의 40중량% 미만일 경우 고속절삭 조건 및 고경도 피삭재 가공시 내열성이 부족으로 인하여 절삭공구의 변형이 빨리 올 수 있으며, 탄화텅스텐(WC), 코발트(Co), 니켈(Ni) 보다 취성이 강한 Ti(C,N)이 75중량%를 초과할 경우 절삭과정에 소결체가 쉽게 손상될 수 있으므로, 40 ~ 75중량% 범위가 바람직하다.When the amount of Ti(C,N) is less than 40% by weight, the deformation of the cutting tool may occur quickly due to lack of heat resistance during high-speed cutting conditions and high-hardness workpiece processing, and tungsten carbide (WC), cobalt (Co), nickel ( If Ti(C,N), which is more brittle than Ni), exceeds 75% by weight, the sintered body may be easily damaged during the cutting process, so the range of 40 to 75% by weight is preferable.
코발트(Co) 및/또는 니켈(Ni)로 이루어진 결합제는 소결체 내에서 경질상인 Ti(C,N)과 WC를 잡아주는 역할을 하는 것으로, 결합제의 함량이 증가함에 따라 인성이 증가하고 함량이 감소함에 따라 인성이 감소하는 경향을 나타낸다. 결합제의 함량이 10중량% 미만인 경우 낮은 인성으로 인해 파손현상을 유발할 수 있어 바람직하지 않고, 25중량%를 초과할 경우 고속 절삭조건에서 공구가 쉽게 변형되므로, 10 ~ 25중량%가 바람직하다.The binder made of cobalt (Co) and/or nickel (Ni) serves to hold the hard phases Ti(C,N) and WC in the sintered body. As the binder content increases, the toughness increases and the content decreases. As it increases, the toughness tends to decrease. If the content of the binder is less than 10% by weight, it is undesirable because it may cause breakage due to low toughness, and if it exceeds 25% by weight, the tool is easily deformed under high-speed cutting conditions, so 10 to 25% by weight is preferable.
상기 탄화텅스텐(WC)은 10중량% 미만일 경우, 고속, 연속조건에서 절삭공구의 변형이 쉽게 발생하는 단점을 가지게 되며, 25중량%를 초과할 경우 Ti(C,N)과 금속 결합상인 코발트(Co) 및/또는 니켈(Ni)과의 결합력을 방해하여 외부로부터 받는 충격에 Ti(C,N)과 금속 결합상 간의 균열발생이 쉽게 일어나기 때문에 공구수명을 저하시킬 수 있다. 따라서 탄화텅스텐(WC)은 10 ~ 25중량%인 것이 바람직하다.When the amount of tungsten carbide (WC) is less than 10% by weight, it has a disadvantage that the cutting tool is easily deformed under high-speed and continuous conditions. Co) and/or nickel (Ni) interferes with the bonding force, and cracks between Ti(C,N) and the metal bonding phase are easily generated by an impact from the outside, thereby reducing the tool life. Therefore, tungsten carbide (WC) is preferably 10 to 25% by weight.
또한, 본 발명에 따른 팁 쏘용 소결체에 있어서, 전체 표면 면적의 50% 미만으로 스웨팅이 형성되어 있을 경우에는 쏘 바디(saw body)에 팁을 용접하였을 때 충분한 용접강도를 얻기 어렵기 때문에, 50% 이상이 바람직하고, 70% 이상이 보다 바람직하다.In addition, in the sintered body for a tip saw according to the present invention, when sweating is formed on less than 50% of the total surface area, it is difficult to obtain sufficient welding strength when the tip is welded to the saw body, 50 % or more is preferable, and 70% or more is more preferable.
또한, 본 발명에 따른 팁 쏘용 소결체에 있어서, 상기 스웨팅의 두께가 1.0㎛ 미만으로 형성될 경우 충분한 용접강도를 얻기 어렵고, 4.0㎛ 초과로 형성할 경우 소결체 내의 Co 함량이 줄어들어 소결체 자체의 인성이 떨어질 수 있으므로, 4.0㎛ 이하로 형성되는 것이 바람직하다.In addition, in the sintered body for a tip saw according to the present invention, when the sweating thickness is formed to be less than 1.0 μm, it is difficult to obtain sufficient welding strength, and when it is formed to be more than 4.0 μm, the Co content in the sintered body is reduced and the toughness of the sintered body itself is reduced. Since it may fall off, it is preferable to be formed to be 4.0 μm or less.
또한, 본 발명에 따른 팁 쏘용 소결체에 있어서, 상기 Ti(C,N)의 평균입도가 1.5㎛ 초과일 경우에는 소결체가 본 발명에서 구현하고자 하는 높은 경도를 얻을 수 없기 때문에, 1.5㎛ 이하인 것이 바람직하다.In addition, in the sintered compact for a tip saw according to the present invention, when the average particle size of Ti(C,N) exceeds 1.5㎛, since the sintered compact cannot obtain the high hardness to be realized in the present invention, it is preferably 1.5㎛ or less do.
상기 소결체의 항자력은 소결체내의 WC 입도를 나타내는 바로미터로 활용할 수 있는데, 이는 통상 WC 입도가 클수록 항자력이 낮게 나타나고, 동일 조성에서 WC 입도는 합금탄소가 높을수록 커지는 경향을 나타낸다. 소결체 내의 WC 입도는 소결체의 경도와 직접적인 연관성을 갖는다. 본 발명에 따른 팁 쏘용 소결체의 보자력(Hc)은 140 ~ 250 Oe 범위로 유지하는 것이 바람직하다.The coercive force of the sintered body can be utilized as a barometer indicating the WC particle size in the sintered body, which generally shows that the larger the WC particle size, the lower the coercive force. The WC particle size in the sintered body has a direct correlation with the hardness of the sintered body. The coercive force (Hc) of the sintered body for the tip saw according to the present invention is preferably maintained in the range of 140 ~ 250 Oe.
또한, 본 발명에 따른 팁 쏘용 소결체에 있어서, 상기 소결체의 용접강도는 130 kgf/㎠ 이상인 것이 바람직하다.In addition, in the sintered compact for a tip saw according to the present invention, the welding strength of the sintered compact is preferably 130 kgf/
또한, 본 발명에 따른 팁 쏘용 소결체에 있어서, 상기 소결체의 전체 표면 면적의 70% 이상에 스웨팅(sweating)이 형성되어 있는 것이 보다 바람직하다.In addition, in the sintered compact for a tip saw according to the present invention, it is more preferable that sweating is formed on at least 70% of the total surface area of the sintered compact.
[실시예][Example]
팁 쏘용 소결체를 제조하기 위하여, 아래 표 1과 같은 조성으로 원료 분말을 준비하였다. 높은 보자력(Hc)을 얻기 위하여, Ti(C,N) 평균입도 1.2㎛ 이하(아래 표 1의 Ti(C,N)은 모두 평균입도 1.0㎛ 인 것을 사용하였다)의 분말을 사용하였다. 또한, 스웨팅 유도를 위해 불건전상이 나타나지 않는 범위에서 탄소를 1.5중량 ~ 2.2중량%의 범위로 추가하였다.In order to prepare a sintered compact for a tip saw, raw material powder was prepared with the composition shown in Table 1 below. In order to obtain a high coercive force (Hc), a powder having an average particle size of Ti(C,N) of 1.2 μm or less (all Ti(C,N) in Table 1 below was used with an average particle size of 1.0 μm) was used. In addition, carbon was added in the range of 1.5 wt% to 2.2 wt% in the range where unhealthy images were not observed for sweating induction.
상기 표 1과 같이 준비된 원료 분말을 혼합하고 조립화 처리를 한 후, 팁 쏘용 소결체 형태의 금형으로 프레스 공정을 수행하였다. 프레스 공정을 통해 만들어진 프레스체는 탄소재질로 만든 플레이트 위에 정렬된 후, 균일 냉각을 위해 탄소재질로 만든 박스(box) 안에 장입하였다.After mixing the raw material powder prepared as shown in Table 1 and granulation treatment, a press process was performed with a mold in the form of a sintered body for a tip saw. The press body made through the press process was arranged on a plate made of carbon material, and then charged into a box made of carbon material for uniform cooling.
프레스체에 대한 소결은 통상의 초경합금 소결방식으로 1450℃에서 실시하였고, 충분한 스웨팅을 얻기 위해서 1450℃에서 1000℃까지 20℃/분의 비교적 빠른 속도로 냉각하였다.The sintering of the press body was carried out at 1450°C in a conventional cemented carbide sintering method, and in order to obtain sufficient sweating, it was cooled from 1450°C to 1000°C at a relatively high rate of 20°C/min.
이와 같이 제조된 소결체의 자성을 포화자화측정기를 이용하여 측정하였고, 표면 스웨팅 정도를 광학현미경과 주사전자현미경(SEM)을 이용하여 관찰하였다. 표면 주사전자현미경 이미지를 활용하여 전체 표면대비 스웨팅량의 면적 비율을 측정하고, 단면 주사전자현미경 사진을 활용하여 스웨팅 두께를 측정하였으며, 그 결과를 아래 표 2에 나타내었다.The magnetism of the thus-prepared sintered body was measured using a saturation magnetometer, and the degree of surface sweating was observed using an optical microscope and a scanning electron microscope (SEM). A surface scanning electron microscope image was used to measure the area ratio of the amount of sweating to the entire surface, and a cross-sectional scanning electron microscope image was used to measure the sweating thickness, and the results are shown in Table 2 below.
본 발명의 실시예에 따른 써멧의 경우, 소결체에 포함되는 탄소 함량이 높아지면 고경도 비자성 석출물이 생성되어 보자력(Hc)가 높아지는데, 이 석출물 효과로 인해 고경도 효과를 얻을 수 있다.In the case of the cermet according to an embodiment of the present invention, when the carbon content included in the sintered body is increased, high hardness non-magnetic precipitates are generated and the coercive force (Hc) is increased. Due to this precipitate effect, a high hardness effect can be obtained.
제조된 소결체를 팁 쏘 바디에 통상적인 방법으로 용접한 후 가공을 거쳐 일반강용 팁 쏘를 완성하였다. 완성된 각 팁 쏘 제품의 소결체 팁을 유니버설 테스팅 머신(INSTRON 5569)을 사용하여, 용접된 팁을 테스팅 머신으로 밀어서 떨어져 나가는 강도를 다음과 같은 시험조건으로 측정하여 용접이탈강도로 하였다.The manufactured sintered body was welded to the tip saw body in a conventional manner and then processed to complete a general steel tip saw. Using a universal testing machine (INSTRON 5569) for the sintered tip of each finished tip saw product, the strength of pushing the welded tip off with the testing machine was measured under the following test conditions to determine the weld breakout strength.
- 시험 속도: 2 mm/min- Test speed: 2 mm/min
- 용접 단면적: 0.1cm2(10.02mm2)- Weld cross-section: 0.1cm 2 (10.02mm 2 )
- 쏘 크기: 360mm(직경)×100개(팁 개수)×2.0mm(쏘 두께)- Saw size: 360mm (diameter)×100 pieces (number of tips)×2.0mm (saw thickness)
- 측정단위: kgf/㎠- Measurement unit: kgf/㎠
또한, 완성된 각 팁 쏘 제품에 대해 절단가공 성능평가를 다음과 같은 조건으로 실시하여, 총 절단개수와 수명종료 유형을 평가하였다.In addition, cutting performance was evaluated for each finished tip saw product under the following conditions to evaluate the total number of cuts and types of end-of-life.
- 피삭재: SCM440, Φ60- Workpiece: SCM440, Φ60
- 절단조건: 48RPM: fn: 0.038mm/rev, 습식- Cutting condition: 48RPM: fn: 0.038mm/rev, wet
이상과 같은 조건으로 실시한 용접이탈강도와 절삭성능 평가 결과를 아래 표 3에 나타내었다.Table 3 below shows the welding breakaway strength and cutting performance evaluation results conducted under the above conditions.
표 3에 나타난 것과 같이, 비교예 1 ~ 3 제품의 경우, 소결체 표면에 형성된 스웨팅이 없거나 작아서 용접강도가 낮아 절단가공 시에 팁 탈락으로 인한 조기 수명종료가 유발되었다. 이에 비해, 본 발명에 따른 제품인 실시예 1 및 2의 경우, 팁 탈락 없이 정상마모로 절단가공이 종료되었다.As shown in Table 3, in the case of Comparative Examples 1 to 3 products, there was no sweating formed on the surface of the sintered body or small, so the welding strength was low, which caused premature end of life due to tip dropping during cutting. In contrast, in the case of Examples 1 and 2, which are products according to the present invention, the cutting process was completed due to normal wear without dropping the tip.
이상과 같이, 본 발명은 기존에 없었던 보자력(Hc)이 매우 높으면서도, 표면 스웨팅이 충분히 형성된 소결체를 구현함으로써, 스테인리스 절단 가공에 우수한 특성을 나타내는 팁 쏘를 구현하였다.As described above, the present invention implements a tip saw that exhibits excellent properties for cutting stainless steel by implementing a sintered body having a sufficiently high surface sweating while having a very high coercive force (Hc), which was not previously present.
Claims (5)
상기 소결체의 전체 표면 면적의 50% 이상에 스웨팅(sweating)이 형성되어 있고, 상기 스웨팅의 평균 두께가 1.0 ~ 4.0㎛인, 팁 쏘용 소결체.A sintered body containing 40 to 75 wt% of Ti(C,N), 10 to 25 wt% of a mixture of one or two selected from cobalt (Co) and nickel (Ni), and 10 to 25 wt% of tungsten carbide (WC) ,
A sweating (sweating) is formed on at least 50% of the total surface area of the sintered body, and the average thickness of the sweating is 1.0 ~ 4.0㎛, a sintered body for a tip saw.
상기 Ti(C,N)의 평균입도는 1.5㎛ 이하인, 팁 쏘용 소결체.The method of claim 1,
The average particle size of the Ti (C, N) is 1.5㎛ or less, the tip saw sintered body.
상기 소결체의 보자력(Hc)은 140 ~ 250 Oe 인, 팁 쏘용 소결체.The method of claim 1,
The coercive force (Hc) of the sintered body is 140 ~ 250 Oe, the tip saw sintered body.
상기 소결체의 용접강도는 120 kgf/㎠ 이상인, 팁 쏘용 소결체.4. The method according to any one of claims 1 to 3,
The welding strength of the sintered body is 120 kgf / ㎠ or more, the tip saw sintered body.
상기 소결체의 전체 표면 면적의 70% 이상에 스웨팅이 형성되어 있는, 팁 쏘용 소결체.4. The method according to any one of claims 1 to 3,
Sweating is formed on more than 70% of the total surface area of the sintered body, the sintered body for the tip saw.
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