KR20010017892A - A method for brazing WC-Co and tool steel - Google Patents

A method for brazing WC-Co and tool steel Download PDF

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KR20010017892A
KR20010017892A KR1019990033635A KR19990033635A KR20010017892A KR 20010017892 A KR20010017892 A KR 20010017892A KR 1019990033635 A KR1019990033635 A KR 1019990033635A KR 19990033635 A KR19990033635 A KR 19990033635A KR 20010017892 A KR20010017892 A KR 20010017892A
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South Korea
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tool steel
cemented carbide
joining
laminate
metal
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KR1019990033635A
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Korean (ko)
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KR100325355B1 (en
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김숙환
장웅성
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신현준
재단법인 포항산업과학연구원
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    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/008—Soldering within a furnace
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0233—Sheets, foils
    • B23K35/0238—Sheets, foils layered
    • 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
    • B23K2103/18—Dissimilar materials

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

PURPOSE: A method for brazing WC-Co based ultralight alloy and tool steel is provided to adjust the size of coagulation width and response layer by inserting and brazing Ni group metal between polished tool steel and ultralight alloy. CONSTITUTION: A method for brazing WC-Co based ultralight alloy and tool steel includes the steps of polishing sides of ultralight alloy and tool steel and cleaning with ultrasonic waves, fixing the cleaned ultralight alloy and tool steel through a jig to face the polished surfaces to each other, inserting Ni group metal between the polished surfaces facing to each other and forming laminated material, heating and brazing the laminated material in a vacuum furnace at the temperature of 20 to 100deg.C higher than the melting point of the inserted material for 5 to 15minutes, and furnace-cooling the brazed laminated material in a normal temperature.

Description

ＷＣ-Ｃｏ계 초경합금과 공구강의 접합방법{A method for brazing WC-Co and tool steel}A method for brazing WC-Co and tool steel}

본 발명은 초경합금과 공구강의 접합(브레이징:brazing)방법에 관한 것으로, 보다 상세하게는 초경합금과 공구강사이에 호일(foil)상의 Ni계 금속을 삽입하여 가열접합시킴으로서 우수한 접합강도를 갖는 초경합금과 공구강의 접합방법에 관한 것이다.The present invention relates to a method of joining (brazing) a cemented carbide and a tool steel, and more particularly, to inserting a Ni-based metal in a foil between a cemented carbide and a tool steel to heat-bond the cemented carbide and the tool steel. It relates to a bonding method.

종래 프레스나 타발기등의 공작기계에 사용되는 펀치는 크게 2종류로 구분할 수 있다. 하나는 펀치 전체를 텅스텐 카바이드로 성형하는 방법으로서, 이 방법에 의해 제조된 펀치를 사용할 경우 그 재질자체가 탄화물이기 때문에 취약하여 쉽게 파손될 수 있다. 또한, 그 전체가 초경합금이기 때문에 가공이 힘들뿐만아니라 그 재료비도 비싸다는 문제가 있었다. 다른 하나의 방법으로 텅스텐 카바이드 팁 길이의 1/3이상을 공구강의 단부에 삽입한후 은납 또는 동 용접으로 결합시키는 방법이 있다. 그러나 이 방법으로 펀치를 제조할 경우 팁을 안정하게 삽입하기 위하여 필요이상의 길이를 준비하지 않으면 안되고 이에따라 값이 비싸지는 문제가 있었다. 또한, 초경합금 팁과 공구강을 결합시키기 위한 공정이 복잡할 뿐만아니라 고속 및 연속적인 충격에 견디기 위하여 초경합금 팁과 공구강의 요철 접척부분에 유격이 허용되지 않아 가공의 정도가 요구되었다. 특히, 각을 이루는 부분에 있어서는 응력집중을 피할 수 없으므로 결함이 생기기 쉽다는 문제가 있었다. 따라서 텅스텐 카바이드 팁을 필요한 두께로 직접 공구강의 샹크(shank)단부에 결합시킴과 아울러 재료를 절약하고 동시에 공구강의 수명이 향상될 수 있는 텅스텐 카바이드 팁과 샹크(shank)를 접합(brazing)할 수 있는 방법의 개발이 요청되었다.Conventionally, punches used in machine tools such as presses and punching machines can be classified into two types. One is a method of forming the entire punch with tungsten carbide, and when using the punch produced by this method, the material itself is carbide, so it can be easily broken. In addition, since the whole is a cemented carbide, not only the processing is difficult but also the material cost is high. Another method involves inserting at least one-third of the tungsten carbide tip length into the end of the tool steel and joining it by silver or copper welding. However, when the punch is manufactured in this way, a length larger than necessary to prepare the tip stably needs to be prepared, and accordingly, a price is expensive. In addition, the process for joining the cemented carbide tip and the tool steel is not only complicated, but the playability is required because there is no play between the cemented carbide tip and the uneven joint portion of the tool steel in order to withstand high speed and continuous impact. Particularly, there is a problem in that stress concentration cannot be avoided in the angular portions, so that defects are likely to occur. This allows the tungsten carbide tip to be joined directly to the shank end of the tool steel to the required thickness, while also allowing for the brazing of tungsten carbide tips and shanks that can save material and at the same time improve the tool steel life. Development of the method was called for.

이러한 텅스텐 카바이드 팁과 공구강 단부를 직접 접합(brazing)할 수 있는 기술의 일예로서 공구강에 초경합금을 소결접합하는 것을 제시하고 있는 일본 특허공개공보(평 9-300024)가 있다. 그러나 소결공정은 그 자체가 복잡하고 제조시간이 많이 소요되므로 제품원가측면에서 문제가 있다.As an example of a technique capable of directly brazing such a tungsten carbide tip and a tool steel end, there is a Japanese Patent Application Laid-Open No. 9-300024 which proposes sintering a cemented carbide to a tool steel. However, since the sintering process itself is complicated and takes a lot of manufacturing time, there is a problem in terms of product cost.

그리고 공구강에 초경합금을 접합시키는 또다른 기술로서 일본특허공개공보(소60-250872)가 있다. 이 방법은 도 1(a)(b)에 나타난 바와같이 초경합금(1)과 공구강(2)을 Ni과 Co의 분말상 삽입금속(3)을 사용하여 접합시키는 기술로서, 그 접합계면의 중앙부가 요철되어 있다. 그러나, 이 방법은 별도로 공구강(2)을 요철가공해야 한다는 불편이 따른다. 또한, 접합부의 결함을 제거하여 접합강도 향상을 위해서는 접합면에 적당한 조도를 부여하는 것이 중요한데, 요철가공에 따라 표면연마가 힘들어 적당한 표면조도를 부여할 수 없다는 문제가 있다. 또한, 공구강은 열팽창계수가 큰 반면 초경합금은 열팽창계수가 작기 때문에 그 차이에 의해 접합(brazing)시 응력이 발생하여 초경합금에 균열이 발생하기 쉽다는 문제가 있다.Another technique for joining cemented carbide to tool steel is Japanese Patent Application Laid-Open No. 60-250872. This method is a technique of joining the cemented carbide (1) and the tool steel (2) using Ni and Co powder-like insertion metal (3), as shown in Fig. 1 (a) (b), the central portion of the joining interface It is. However, this method is inconvenient to separately process the tool steel (2). In addition, in order to remove the defects of the joints and to improve the joint strength, it is important to provide an appropriate roughness to the joint surface, but there is a problem in that surface polishing is difficult due to uneven processing, and therefore, proper surface roughness cannot be provided. In addition, since the tool steel has a large coefficient of thermal expansion while the cemented carbide has a small coefficient of thermal expansion, there is a problem in that stress is generated at the time of bonding due to the difference, so that the cemented carbide tends to crack.

따라서, 본 발명은 상기의 문제를 해결하기 위하여 안출된 것으로, 소정의 조도로 연마된 공구강과 초경합금사이에 평면의 호일(foil)상 Ni계 금속을 삽입하여 접합(brazing)시키면서 그 응고폭 및 반응층의 크기를 적절히 조절함으로써 접합강도가 우수한 초경합금과 공구강의 접합방법을 제공함을 그 목적으로 한다.Accordingly, the present invention has been made to solve the above problems, and the solidification width and reaction while inserting and brazing a planar foil-like Ni-based metal between a tool steel polished to a predetermined roughness and a cemented carbide. It is an object of the present invention to provide a method of joining cemented carbide and tool steel with excellent bonding strength by appropriately adjusting the size of the layer.

도 1(a)(b)는 종래의 초경합금과 공구강의 접합방법으로서 공구강에 요철을 둔 분말상 Ni 금속을 이용한 접합방법의 개략도Figure 1 (a) (b) is a schematic diagram of a joining method using a powdered Ni metal with irregularities in the tool steel as a conventional joining method of cemented carbide and tool steel

도 2는 본 발명에 따른 초경합금과 공구강의 접합방법으로2 is a joining method of cemented carbide and tool steel according to the present invention

도 2(a)는 지그(JIG)의 좌우시편고정장치에 의해 고정된 적층재를,Figure 2 (a) is a laminated material fixed by the left and right specimen fixing device of the jig (JIG),

도 2(b)는 지그의 전후시편고정장치에 의해 고정된 적층재를 나타낸Figure 2 (b) shows the laminate fixed by the front and rear specimen fixing device of the jig

개략도schematic

도 3은 본 발명에 있어서의 응고폭변화에 따른 균열발생율을 나타내는 그림Figure 3 is a diagram showing the crack incidence rate according to the change in the solidification width in the present invention

도 4는 본 발명에 있어서의 표면평균조도에 따른 접합강도의 변화를 나타내Figure 4 shows the change in bonding strength according to the surface average roughness in the present invention

는 그림Picture

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

10..........하부 지지대 20..........좌우시편고정장치10 .......... Lower Support 20 .......... Left and Right Specimen Fixture

21..........전후시편고정장치 22..........시편고정장치의 고정구21 .......... Sample Lock 22 ..........

30..........초경합금 31,41........삽입금속 흐름방지제Carbide alloy 31,41 ........................ Insert metal flow inhibitor

40.......... 공구강 50..........삽입금속40 .......... Tool Steel 50 .......... Inserted Metal

상기의 목적을 달성하기 위한 본 발명은, WC-Co계 초경합금과 공구강을 접합(brazing)하는 방법에 있어서, 상기 초경합금과 공구강의 일측면을 연마한 후 초음파로 세척하는 단계; 상기 세척된 초경합금과 공구강을 그 연마된 면이 마주하도록 지그를 통해 고정하고 그 사이에 호일(foil)상의 Ni계 금속을 삽입하여 적층재를 형성하는 단계; 상기 적층재를 진공로에서 상기 Ni계 삽입금속의 용융점보다 20~100℃ 높는 온도로 가열하여 접합시키는 단계; 및 상기 접합된 적층재를 상온까지 노냉시키는 단계;를 특징으로 하는 초경합금와 공구강의 접합방법을 제공한다.According to an aspect of the present invention, there is provided a method of brazing a WC-Co-based cemented carbide and a tool steel, the method comprising: cleaning one side surface of the cemented carbide and the tool steel with ultrasonic waves; Fixing the washed cemented carbide and tool steel through a jig so that the polished surface thereof faces and inserting a Ni-based metal on a foil therebetween to form a laminate; Bonding the laminate to a temperature of 20 to 100 ° C. higher than the melting point of the Ni-based insertion metal in a vacuum furnace; And the step of furnace-cooling the joined laminate to room temperature. It provides a cemented carbide and tool steel joining method.

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

본 발명에선 공구강과 초경합금사이에 호일(foil)상의 Ni계 금속을 삽입한 적층재를 형성하고, 이를 소정의 온도로 가열하여 그 접합시 삽입금속의 응고폭 및 반응층을 제어함으로써 우수한 접합강도를 확보함을 그 특징으로 한다.According to the present invention, a laminated material in which a Ni-based metal is inserted between a tool steel and a cemented carbide is formed, and heated to a predetermined temperature to control the solidification width and the reaction layer of the inserted metal at the time of joining, thereby providing excellent bonding strength. It is characterized by securing.

따라서, 본 발명에 있어선 상기 적층재를 10-4Torr이하의 진공로에서 Ni계 삽입금속의 용융점보다 20~100℃ 높은 온도로 가열함이 바람직한데, 이는 그 온도가 삽입금속 용융점보다 낮거나 그 용융점보다 20℃미만으로 높을 경우 삽입금속의 용융이 불완전하여 완벽한 접합을 형성할 수 없어 소정의 접합강도에 필요한 Ni계 삽입금속의 응고폭을 유지할 수 없기 때문이다. 또한, 삽입금속 용융점보다 100℃를 초과하여 높을 경우 그 접합계면에서의 반응층이 너무 두꺼워져 취약하기 때문에 냉각중 균열발생의 염려가 있으며, 아울러 초경합금과 고속도공구강의 큰 열팽창계수 차이때문에 계면응력이 커져 균열이 발생하기 때문이다. 가장 바람직하게는 상기 적층재를 1030~1090℃ 온도범위에서 가열하는 것이다.Therefore, in the present invention, it is preferable that the laminate is heated to a temperature of 20 to 100 ° C. higher than the melting point of the Ni-based intercalation metal in a vacuum furnace of 10 −4 Torr or less, which is lower than or equal to the melting point of the intermetallic. This is because when the melting point is lower than 20 ° C., the melting of the insertion metal is incomplete, so that a perfect joint cannot be formed, and thus the solidification width of the Ni-based insertion metal required for the predetermined bonding strength cannot be maintained. In addition, if it is higher than 100 ° C above the melting point of the intermetallic, the reaction layer is too thick and brittle, so that there is a risk of cracking during cooling. This is because the cracks are generated when they become large. Most preferably, the laminate is heated in a temperature range of 1030 ~ 1090 ℃.

또한, 본 발명에서는 상기 적층재의 가열시간은 5~15분으로 제한함이 바람직한데, 이는 5분미만의 경우 완벽한 접합부를 형성할 수 없으며 15분을 초과하는 경우 반응층이 너무 커질 염려가 있기 때문이다.In addition, in the present invention, it is preferable that the heating time of the laminate is limited to 5 to 15 minutes, since it is impossible to form a perfect joint in less than 5 minutes, and the reaction layer may become too large if it exceeds 15 minutes. to be.

또한, 본 발명에서는 초경합금의 크기를 공구강 90~98% 수준이되도록 함이 바람직한데, 이는 양 소재간 열팽창계수의 차이에 기인한 균열발생을 방지하고 접합후 가공량을 최소하기 위함이다.In addition, in the present invention, it is preferable that the size of the cemented carbide is 90 to 98% of the tool steel, in order to prevent the occurrence of cracking due to the difference in thermal expansion coefficient between the two materials and to minimize the amount of processing after joining.

상술한 바와같이, 본 발명에선 적층재의 우수한 접합강도를 담보하기 위해선 상기 적층재의 고온접합시 Ni계 삽입금속의 응고폭이 소정의 크기로 제한될 것이 요구된다. 이러한 응고폭은 상기 적층재의 가열온도, 가열시간 등에 따라 달라질 수 있으나, 가장 바람직하게는 그 응고폭을 60~90㎛로 제한하는 것이다.As described above, in the present invention, in order to secure the excellent bonding strength of the laminate, it is required that the solidification width of the Ni-based intercalation metal is limited to a predetermined size during high temperature bonding of the laminate. The solidification width may vary depending on the heating temperature, heating time, etc. of the laminate, and most preferably, the solidification width is limited to 60 to 90 μm.

또한, 본 발명은 상기 적층재의 우수한 접합강도를 담보하기 위해선 그 접합부를 이루는 초경합금과 공구강의 표면부를 그 적층전에 적절한 조도로 연마함을 특징으로 하는데, 바람직하게는 그 평균 표면조도(Ra)를 0.06~0.07μ범위로 제한하는 것이다. 왜냐하면, 상기 표면조도가 0.06미만일 경우 용융된 Ni계 삽입금속의 젖음성이 나빠지며, 0.07을 초과할 경우 그 표면이 거칠게 연마되어 용융된 삽입금속간의 접촉면적의 감소를 초래하여 접합강도가 떨어질뿐만 아니라 결함발생측면에서도 불리하기 때문이다.In addition, the present invention is characterized in that the surface of the cemented carbide and the tool steel forming the joint portion is polished to an appropriate roughness before lamination in order to ensure the excellent bonding strength of the laminate, preferably the average surface roughness (Ra) of 0.06 Limit to ~ 0.07μ range. If the surface roughness is less than 0.06, the wettability of the molten Ni-based intercalating metal deteriorates, and when the surface roughness is more than 0.07, the surface is roughly polished, resulting in a decrease in the contact area between the molten intercalating metals, thereby lowering the joint strength. This is because it is disadvantageous in terms of defect generation.

한편, 상기 진공로에서 접합된 적층재는 상온으로 노냉되는데, 이때 접합(brazing)직후부터 750℃까지는 10-2Torr 정도의 저진공상태로 유지함이 바람직하다. 왜냐하면, 10-4Torr이하의 고진공하에서 냉각시킬경우 초경합금중의 Co등이 증발되어 초경합금의 경도저하 및 강도저하를 초래하기 때문이다.On the other hand, the laminated material bonded in the vacuum furnace is cold-cooled to room temperature, at which time it is preferable to maintain in a low vacuum state of about 10 -2 Torr immediately after brazing (750 ℃). This is because, when cooled under a high vacuum of 10 -4 Torr or less, Co in the cemented carbide is evaporated, leading to a decrease in hardness and strength of the cemented carbide.

이하, 첨부도면을 참조하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 있어 초경합금과 공구강와의 사이에 Ni계 금속을 지그(JIG)를 통해 삽입하는 것을 나타내는 개략도이다.FIG. 2 is a schematic view showing insertion of a Ni-based metal through a jig between a cemented carbide and a tool steel in the present invention.

먼저 초경합금과 공구강은 그 접합계면이 될 일측면을 소정의 조도로 연마하고 초음파로 세척시킨다. 그리고 도 2에 나타난 바와같이, 세척된 공구강 (40)과 초경금합금(30)은 좌우시편고정장치(20)과 전후시편고정장치 (21)를 통하여 그 연마된 면이 마주하고 중심선이 일치하도록 고정하고 그 사이에 호일(foil)상의 Ni계 금속(50)을 삽입시켜 적층재를 형성한다. 여기에서 상기 시편고정장치들은 하부지지대(10)에 의해 지지되며, 시편고정장치 고정구(22)에 의해 고정된다.First, the cemented carbide and the tool steel are polished with a predetermined roughness on one side to be the joining interface and cleaned by ultrasonic waves. As shown in FIG. 2, the cleaned tool steel 40 and the cemented carbide alloy 30 are fixed to face the polished surface through the left and right specimen fixing device 20 and the front and rear specimen fixing device 21 so that the center lines thereof coincide with each other. Then, a foil-based Ni-based metal 50 is inserted therebetween to form a laminate. Here, the specimen fixing devices are supported by the lower support 10, it is fixed by the specimen fixing device 22.

상기와 같이 형성된 적층재는 소재의 산화 및 불순물의 오염을 최소화하기 위하여 10-4Torr이하의 진공로에서 가열되며, 그 가열온도는 상기 삽입금속의 용융점보다 20~100℃높은 온도로 제한함이 바람직하다. 이러한 온도로 가열되면 Ni계 삽입금속이 용융되어 소재에 젖으면서 표면장력에 의해 퍼져 접합된다. 그러나, 통상 Ni계 금속은 초경합금과 공구강에 젖음성이 좋기 때문에 접합시 용융된 삽입금속이 접합부외부로 흘러 결국 삽입금속량의 감소를 초래하여 건전한 접합부를 형성할 수 없다는 문제가 있다.The laminate formed as described above is heated in a vacuum furnace of 10 -4 Torr or less in order to minimize oxidation of materials and contamination of impurities, and the heating temperature is preferably limited to a temperature of 20 to 100 ° C. higher than the melting point of the insert metal. Do. When heated to such a temperature, the Ni-based intercalating metal is melted and wetted by the material, spreading and bonding by surface tension. However, since Ni-based metals generally have good wettability with cemented carbides and tool steels, a molten insertion metal flows out of the joint at the time of joining, resulting in a decrease in the amount of the insertion metal, thereby preventing the formation of a healthy joint.

따라서 필요한 부위에만 삽입금속이 젖으면서 건전한 접합부가 형성되도록 삽입금속 흐름방지제(stopoff:31,41)를 초경합금과 공구강주변에 도포함이 바람직하다. 이렇게 삽입금속 흐름방지제를 도포함으로서 접합부가 항상 일정한 응고폭과 반응층을 형성하도록 유지시켜 주기 때문에 균열발생없는 건전한 접합부를 얻을 수 있는 것이다.Therefore, it is preferable to include the insert metal stopper (stopoff: 31, 41) around the cemented carbide and the tool steel so that a healthy joint is formed while the insertion metal is wetted only at the required part. In this way, it is possible to obtain a healthy joint with no cracks since the inclusion of an intermetallic flow inhibitor keeps the junction always forming a constant solidification width and a reaction layer.

상기와 같이 얻어진 접합된 적층재는 최종적으로 상온까지 노냉시켜 접합강도가 우수한 초경합금과 공구강의 접합재를 얻을 수 있는데, 보다 바람직하게는, 초경합금중의 Co의 증발에 따라 야기될 수 있는 초경합금의 경도및 강도저하를 방지하기 위해서 접합직후부터 750℃까지는 10-2Torr정도의 저진공상태에서 냉각시킴이 바람직하다.The bonded laminate obtained as described above can be finally cooled to room temperature to obtain a cemented carbide and a tool steel with excellent bonding strength. More preferably, the hardness and strength of the cemented carbide which may be caused by the evaporation of Co in the cemented carbide. In order to prevent a decrease, it is preferable to cool in a low vacuum state of about 10 -2 Torr immediately after joining to 750 degreeC.

이하, 실시예를 통하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail through examples.

(실시예 1)(Example 1)

초경합금과 공구강의 접합면을 연마한후 초음파세척하고 이를 지그를 통해 고정하면서 Ni의 함량이 85%인 Ni-Cr-Fe-Si등을 포함한 합금금속을 삽입시켜 적층재를 만들었다. 이 적층재를 진공로에서 1030℃에서 10분간 접합시키고 그후 접합된 적층재를 상온으로 냉각시켰다. 그리고 상기 접합된 적층재를 절단하여 삽입금속의 응고폭을 측정한후 그에따른 접합부의 균열발생여부를 측정하여 그 결과를 도 3에 나타내었다. 도 3에 나타난 바와같이 삽입금속의 응고폭이 60~90㎛일때 균열발생없는 건전한 접합부가 얻어짐을 알수 있다.After bonding the cemented carbide to the tool steel, ultrasonic cleaning was carried out and fixed through a jig, and alloys including Ni-Cr-Fe-Si containing 85% Ni were inserted. This laminated material was bonded for 10 minutes at 1030 degreeC in a vacuum furnace, and the laminated laminated material was cooled to room temperature after that. And after measuring the solidification width of the insertion metal by cutting the laminated laminate was measured whether the resulting crack of the joint is shown in Figure 3 the results. As shown in FIG. 3, it can be seen that when the solidification width of the insert metal is 60 to 90 μm, a healthy joint without cracking is obtained.

(실시예 2)(Example 2)

접합부가 될 초경합금과 공구강의 일측면을 그 조도를 달리하여 연마된 수개의 시편을 마련하였으며, 중간 삽입금속으로 상기 실시예 1과 동일한 Ni계 삽입금속을 사용하였다. 그리고 이들을 상기 실시예 1에서와 동일한 조건으로 진공로에서 접합시킨후 상온으로 냉각시켰으며, 그 평균 표면조도(Ra)에 따른 접합강도를 측정하여 도 4에 나타내었다. 도 4에 나타난 바와같이, 그 평균표면조도가 0.06~0.07μ일때 가장 우수한 접합강도를 가짐을 알 수 있다.One side of the cemented carbide and the tool steel to be joined to each other was prepared by varying the roughness to prepare several specimens, and the same Ni-based insertion metal as in Example 1 was used as the intermediate insertion metal. And these were bonded in a vacuum furnace under the same conditions as in Example 1 and cooled to room temperature, and the bonding strength according to the average surface roughness (Ra) is measured and shown in FIG. As shown in Figure 4, it can be seen that the average surface roughness has the best bonding strength when 0.06 ~ 0.07μ.

상기한 바와 같이, 본 발명은 호일(foil)상의 Ni계 금속을 초경합금과 공구강사이에 삽입하여 접합하면서 그 반응층 및 응고폭을 적절히 제어함으로써 접합강도가 우수한 초경합금과 공구강의 접합재를 제조할 수 있다. 또한 본 발명은 그 접합계면이 평면이므로 자동화 연마가 용이하여 생산성제고를 꾀할 수 있음과 아울러 초경합금과 공구강 소재의 표면조도를 적절히 제어함으로써 우수한 접합강도를 얻음에도 유용한 효과가 있는 것이다.As described above, the present invention can produce a cemented carbide and tool steel bonding material having excellent bonding strength by appropriately controlling the reaction layer and the solidification width while inserting a foil-based Ni-based metal between the cemented carbide and the tool steel. . In addition, the present invention has a useful effect in obtaining excellent bonding strength by controlling the surface roughness of cemented carbide and tool steel material, as well as improving the productivity by easy automated polishing because the bonding interface is flat.

Claims (12)

WC-Co계 초경합금과 공구강을 접합하는 방법에 있어서, 상기 초경합금과 공구강의 일측면을 연마한 후 초음파로 세척하는 단계; 상기 세척된 초경합금과 공구강을 그 연마된 면이 마주하도록 지그(JIG)를 통해 고정하고 그 사이에 호일(foil)상의 Ni계 금속을 삽입하여 적층재를 형성하는 단계; 상기 적층재를 진공로에서 상기 삽입재의 용융점 보다 20~100℃ 높은 온도범위에서 5~15분 동안 가열시켜 접합시키는 단계; 및 상기 접합된 적층재를 상온으로 노냉시키는 단계;를 포함하여 구성됨을 특징으로 하는 WC-Co계 초경합금과 공구강의 접합방법A method of joining a WC-Co cemented carbide and a tool steel, the method comprising: cleaning one side surface of the cemented carbide and the tool steel by ultrasonic cleaning; Fixing the washed cemented carbide and the tool steel through a jig so that the polished surface thereof faces and inserting a Ni-based metal on a foil therebetween to form a laminate; Joining the laminate by heating in a vacuum furnace for 5 to 15 minutes in a temperature range of 20 to 100 ° C. higher than the melting point of the insert; And laminating the bonded laminate material at room temperature. The method of joining a WC-Co cemented carbide and a tool steel, comprising: 제 1항에 있어서, 상기 적층재는 진공로에서 1030~1090℃의 온도로 가열됨을 특징으로 하는 접합방법The method of claim 1, wherein the laminate is heated in a vacuum furnace at a temperature of 1030 ~ 1090 ℃. 제 1항 또는 2항에 있어서, 상기 적층재를 형성하는 단계에서 삽입금속 흐름방지제(stopoff)를 초경합금과 공구강주변에 도포함을 특징으로 하는 접합방법The joining method according to claim 1 or 2, wherein the inserting metal stopper is applied around the cemented carbide and the tool steel in the forming of the laminate. 제 1항 또는 2항에 있어서, 상기 Ni계 삽입금속의 응고폭은 60~90㎛임을 특징으로 하는 접합방법The joining method according to claim 1 or 2, wherein the solidification width of the Ni-based intercalation metal is 60 to 90 µm. 제 4항에 있어서, 상기 초경합금과 공구강의 크기의 비가 90~98%임을 특징으로 하는 접합방법The joining method according to claim 4, wherein the ratio of the size of the cemented carbide and the tool steel is 90 to 98%. 제 3항에 있어서, 상기 Ni계 삽입금속의 응고폭은 60~90㎛이며, 상기 초경합금과 공구강의 크기의 비가 90~98%임을 특징으로 하는 접합방법The joining method according to claim 3, wherein the solidification width of the Ni-based intercalation metal is 60 to 90 µm, and the ratio of the size of the cemented carbide to the tool steel is 90 to 98%. 제 1항 또는 2항에 있어서, 상기 초경합금과 공구강은 표면평균조도가 0.56~0.74 μ의 범위에 들도록 연마됨을 특징으로 하는 방법The method according to claim 1 or 2, wherein the cemented carbide and the tool steel are ground to have a surface average roughness in the range of 0.56 to 0.74 µ. 제 7항에 있어서, 상기 초경합금과 고속도공구강의 크기의 비가 90~98%이고 상기 Ni계 삽입금속의 응고폭은 60~90㎛임을 특징으로 하는 접합방법8. The bonding method according to claim 7, wherein the ratio of the size of the cemented carbide to the high-speed coated steel is 90 to 98% and the solidification width of the Ni-based intercalation metal is 60 to 90 µm. 제 6항에 있어서, 상기 초금합금과 공구강은 표면평균조도가 0.56~0.74 μ의 범위에 들도록 연마됨을 특징으로 하는 방법7. The method of claim 6, wherein the superalloy and the tool steel are ground to have a surface average roughness in the range of 0.56 to 0.74 mu. 제 1항 또는 2항에 있어서, 상기 접합된 적층재는 접합후 750℃에 이를때까지 10-2Torr정도의 저진공상태에서 냉각됨을 특징으로 하는 접합방법The bonding method according to claim 1 or 2, wherein the bonded laminate is cooled in a low vacuum state of about 10 -2 Torr until reaching 750 ° C after bonding. 제 10항에 있어서, 상기 초경합금와 고속도공구강의 크기의 비가 90~98%이고, 상기 Ni계 삽입금속의 응고폭은 60~90㎛임을 특징으로 하는 접합방법The joining method according to claim 10, wherein the ratio of the size of the cemented carbide to the high-speed coated steel is 90 to 98%, and the solidification width of the Ni-based intercalation metal is 60 to 90 µm. 제 6항 또는 9항에 있어서, 상기 접합된 적층재는 접합후 750℃에 이를때까지 10-2Torr정도의 저진공상태에서 냉각됨을 특징으로 하는 접합방법The bonding method according to claim 6 or 9, wherein the laminated laminate is cooled in a low vacuum state of about 10 -2 Torr until reaching 750 ° C after bonding.
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KR20140142331A (en) * 2012-03-29 2014-12-11 쎄코 툴스 에이비 Cemented carbide body and method for manufacturing the cemented carbide body
KR20170014777A (en) 2015-07-31 2017-02-08 덕산하이메탈(주) Bonding method for cemented carbide material using metal coating layer with exothermic and amorphous characteristics
WO2017022991A1 (en) * 2015-07-31 2017-02-09 덕산하이메탈(주) Method for joining superhard materials using metal plating film having amorphous and heating characteristics

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