CBN sintered compact and cutting tool using the same

A technology of cutting tools and sintered bodies, which is applied in the direction of cutting tools for lathes, manufacturing tools, turning equipment, etc., and can solve problems such as insufficient reliability, sudden chipping, abnormal wear, etc.

Active Publication Date: 2008-01-09
SUMITOMO ELECTRIC HARDMETAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when cutting iron-based sintered materials containing a large number of hard particles and having a Hv (Vickers hardness) of at least 2.5 GPa, or performing carburization to remove the carburized layer of hardened steel with an HRc (Rockwell C hardness) of 40 to 62 Conventional cBN sintered body cutting tools experience abnormal wear or sudden collapse during carbon layer removal machining, or when performing finishing machining of hardened steel gears with an HRc (Rockwell C hardness) of 58 or higher, or parts with bolt holes or notches edge, which is not reliable enough for stable, continuous processing, so grinding must still be relied upon in some processing applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare binding material powder and cBN powder with an average particle size of 2μm. The binding material powder is obtained by mixing 60wt% Co, 30wt% Al and 10wt% WC. Use cemented carbide barrels and balls to mix melamine powder into this binding material and cBN powder. The quantity and heat treatment conditions are shown in Table 1.

[0033] The mixed powder was put into a cemented carbide container for filling, and sintered at a pressure of 7.0 GPa and a temperature of 1820°C for 30 minutes. The obtained sintered body was analyzed with an X-ray diffractometer, and then cobalt compounds, aluminum compounds, etc. other than cBN were identified in all samples.

[0034] Table 1 shows the cBN sintered body obtained by changing the heat treatment conditions and the ratio of cBN powder, binder powder, and melamine as a carbon source. Each cBN sintered body thus prepared was analyzed by gas analysis and high-frequency plasma emission spectroscopy (hereinafter referred to as ICP...

Embodiment 2

[0055] Prepare cBN powder and binder powder with an average particle size of 3μm. The bonding material powder is obtained by mixing 70wt% TiN, 15wt% Al and 15wt% Ti. Use cemented carbide barrels and balls to combine polyamide ([-NH(CH 2 ) 5 CO-] n ) Powder is mixed into this binding material and cBN powder, the quantity and heat treatment conditions are shown in Table 2.

[0056] The mixed powder was put into a cemented carbide container for filling, and sintered at a pressure of 6.0 GPa and a temperature of 1850°C for 30 minutes. Analyze the sintered body with an X-ray diffractometer, and then identify TiN and TiB except cBN in all samples 2 , AlN, Al 2 O 3 Wait.

[0057] The content of the cBN component in the cBN sintered body and the carbon content relative to the cBN component in the sintered body were measured in the same manner as in Example 1.

[0058] In Table 2, the cBN content refers to the proportion of cBN components included after sintering, and the polyamide content...

Embodiment 3

[0078] In the mixed powder of hBN powder with an average particle size of 0.5μm and mesophase carbon powder with an average particle size of less than or equal to 0.1μm, 0.5wt% of polyvinyl alcohol, 0.1wt% of polyethylene glycol and 0.1wt are added to the mixed powder. % Paraffin wax. In addition, these components are mixed with an ethanol solvent in a Teflon (registered trademark) container and dried naturally, and then a disk-shaped molded product is formed. Several shaped products are made by adjusting the amount of mesophase carbon powder added, so that the carbon content in the shaped products is from 0.003wt% to no more than 0.5wt%.

[0079] These different hBN molded products were placed in a high-frequency furnace and heated to 2000°C for 2 hours in a nitrogen atmosphere. Then, the product was put into a tungsten container and sintered at a pressure of 7.5 GPa and a temperature of 2000°C for 30 minutes. The structure of the sintered body was analyzed with a transmission el...

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Abstract

Provided are a high strength and highly abrasion-resistant cBN sintered compact which is excellent in the resistance to abrasion and the resistance to partial loss, in the high speed / highly efficient cutting of an iron-based material being hard and difficult to cut; and a cutting tool using the above sintered compact. A cBN sintered compact which contains 45 to 99.9 wt % of a cBN component, characterized in that it contains carbon in an amount of 0.01 to 0.15 wt % relative to the weight of the cBN component in the inside of a cBN particle thereof and in a particle boundary of the bonding between cBN particles; and a cutting tool which uses the sintered compact at least in a region relating to cutting.

Description

Technical field [0001] The invention relates to a cBN sintered body with excellent wear resistance and chipping resistance in high-speed and high-efficiency cutting of iron-based high-hardness difficult-to-cut materials, and to a cutting tool using the cBN sintered body. Background technique [0002] Compared with traditional cutting tools such as cemented carbide tools, cBN sintered body cutting tools have better material properties due to the hardness and chemical stability of cBN sintered body, showing longer tool life and higher efficiency; It has much better adaptability than grinding tools and realizes environmentally friendly production. Therefore, cBN sintered body cutting tools have replaced grinding in processing difficult-to-cut iron-based materials, especially work hardened steel. The cBN sintered body material can be divided into two types, one includes a binding material, in which the content of cBN is high and the cBN particles are combined with the binding materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14B23B27/20C22C29/16
CPCC22C26/00B22F2998/00B22F2005/001B22F3/10B23B27/14C22C29/16B23B27/20
Inventor 久木野晓冈村克己深谷朋弘
Owner SUMITOMO ELECTRIC HARDMETAL CORP
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