KR20170105841A - Producing method of cemented carbide boring bar - Google Patents

Producing method of cemented carbide boring bar Download PDF

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Publication number
KR20170105841A
KR20170105841A KR1020160029018A KR20160029018A KR20170105841A KR 20170105841 A KR20170105841 A KR 20170105841A KR 1020160029018 A KR1020160029018 A KR 1020160029018A KR 20160029018 A KR20160029018 A KR 20160029018A KR 20170105841 A KR20170105841 A KR 20170105841A
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KR
South Korea
Prior art keywords
cemented carbide
boring bar
carbide
zinc
scrap
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Application number
KR1020160029018A
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Korean (ko)
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KR101928523B1 (en
Inventor
송창빈
이태행
유재근
Original Assignee
공주대학교 산학협력단
유재근
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Priority to KR1020160029018A priority Critical patent/KR101928523B1/en
Publication of KR20170105841A publication Critical patent/KR20170105841A/en
Application granted granted Critical
Publication of KR101928523B1 publication Critical patent/KR101928523B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/02—Boring bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/03—Boring heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/04—Tool holders for a single cutting tool
    • B23B29/12—Special arrangements on tool holders
    • 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
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/10—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on titanium carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Powder Metallurgy (AREA)

Abstract

    The present invention relates to a method of manufacturing a cemented carbide bar having a high cost by regenerating various scrapped cemented carbide scrap which is discarded at a low price after use, comprising the steps of: pulverizing the collected cemented carbide to 10 mm or less; A Zn bath reaction step, finely pulverizing and agglomerating a waste cemented carbide obtained from the zinc bath with a ball mill, compression molding and sintering the pulverized cemented carbide powder, and subjecting the sintered body obtained after the sintering process to a suitable size A step of polishing in the form of a rod, and a step of brazing a boring bar head to the polished carbide rod to manufacture a carbide boring bar.

Description

Technical Field [0001] The present invention relates to a carbide boring bar,

The present invention relates to a method for boring cemented carbide scrap which is used for various industrial cemented carbide tools (e.g., insert tips, drills, end mills, etc.) and then discarded at low cost by using a waste cemented carbide powder regenerated using a Zn bath process The present invention relates to a method of manufacturing a carbide boring bar for manufacturing a bar.

The carbide boring bar is one of the holders that are used by fixing the cemented carbide insert tip for the inner diameter cutting of the workpiece with a screw and it is usually made of relatively cheap carbon steel in the case of commercial products. In the case of a carbide boring bar, since the cemented carbide is manufactured using the same cemented carbide material as that of the cemented carbide insert tip, the strength of the carbide boring bar is increased, However, it is used only as an auxiliary tool for precision work because it is expensive.

Cemented carbide is a high melting point and high strength alloy material mainly composed of tungsten (W) and cobalt (Co), which have a small amount of reserves. However, the importance of recycling of used cemented carbide scraps has long been recognized , The conventional physico-chemical separation and refining techniques require technical problems and high cost, and environmental problems such as waste acid treatment during treatment with strong acids (HCl, H 2 SO 4 , HNO 3, etc.) Has been pointed out.

In addition, the scrap of various types of waste cemented carbide is manufactured in a wide variety of forms depending on the use and purpose of various tools as well as the chemical composition of the alloying elements of each manufacturer. Particularly, (2) WC (TaC, TiC, NbC, VC, HfC) - Co (Ni, Fe) system, TiC, Al 2 O 3 , and the like are produced. Since the scrap of various kinds of waste cemented carbide is not classified at the time of disposal after being used but the waste cemented carbide scrap of the two kinds is mixed and discarded, It is difficult to separate and recycle waste cemented carbide scrap according to each composition.

Korean Patent Publication No. 10-2003-0077091 (published on October 1, 2003) Korean Patent Laid-Open No. 10-2003-0009592 (published Feb. 2003, 2003) Korean Patent Publication No. 10-2005-0095762 (disclosed on September 30, 2005) Korea Utility Model Registration 20-0335550 (Registered on November 29, 2003)

Since the cost of the carbide boring bar is high and the cemented carbide is manufactured in different chemical compositions of the alloying elements for each manufacturer during the recycling process of the cemented carbide, the scrap of the cemented carbide is classified and processed. However, In order to solve the problem of environmental pollution occurring during the recycling process, a waste cemented carbide powder recycled by using a Zn bath process is used as a raw material for the waste cemented carbide scrap, A zinc bath step, a fine grinding and granulating step of the recycled pulverized cemented carbide powder, a compression molding and sintering step of the assembled pulverized cemented carbide powder, a grinding step of the sintered sintered body, a step of brazing the boring bar head to the polished sintered body .

The present invention relates to a method for producing a cemented carbide boring bar by regenerating waste cemented carbide scrap, comprising the steps of preparing a zinc bath (Zn bath) capable of producing a relatively environmentally friendly and inexpensive facility due to no generation of waste acids (HCl, H 2 SO 4 , HNO 3 ) The cemented carbide scrap and the metal zinc are put into an alumina crucible at a suitable ratio and heated in an electric furnace in an inert atmosphere at 700 to 1000 ° C for about 1 to 3 hours to obtain a cemented carbide (Co) and Co-Zn alloy are separated into two phases by the elution of the used Co, so that the volume expansion occurs and collapses. At this time, the reaction rate is a ratio of the weight of the cemented carbide scrap and the metal zinc And the heating temperature.

In addition, a boring bar using pulverized cemented carbide is manufactured by using powder metallurgy (P / M) and machining in the process of producing a carbide boring bar using the waste cemented carbide powder recycled by the present invention.

The present invention uses a low-cost cemented carbide powder recycled by a zinc bath process as a means for producing a cemented carbide bar which is metallurgically recovered from metallurgically scrapped cemented carbide as a raw material, By supplying the produced boring bar to the production site, it is possible to contribute to the production of high-precision products as well as to improve the productivity and economical efficiency in comparison with the carbon steel boring bar when the waste resources are recycled.

Figure 1 is a process flow diagram of the recycling process of the present invention
Fig. 2 is a graph showing actual carbide boring bar photograph

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The present invention relates to a method of manufacturing a boring bar using waste cemented carbide powder recycled by a Zn bath process as raw materials, comprising the steps of zinc bath of scrapped cemented carbide, pulverized cemented carbide Pulverizing and granulating the powder, compression molding and sintering the granulated cemented carbide powder, polishing the sintered sintered body, and brazing the boring bar head to the polished sintered body.

The present invention relates to a method for regenerating waste cemented carbide scrap (1) in powder form using a relatively simple Zn bath process (5), comprising collecting the collected cemented carbide hard scrap (1) ) Is put into an alumina crucible at a suitable ratio with a zinc ingot, and then heated in an electric furnace in an inert atmosphere of about 700 to about 1100 DEG C for a predetermined time to form a carbide material mainly composed of tungsten carbide (WC) When the cobalt (Co) or nickel (Ni) associated with the phase (WC, TaC, TiC or NbC) elutes into the molten zinc (Zn) to form a Zn-Co (Ni) alloy phase, Vacuum heating at about 2.5 x 10 -2 torr results in volatilization of the zinc (Zn) by leaving a charcoal phase (WC, TaC, TiC, NbC, etc.) and Co (or Ni) as a binder.

The Zn bath reaction is as follows.

WC-TiC-TaC-NbC-Co (s) + Zn (I) -----

WC-TiC-TaC-NbC (s) + Co-Zn alloy (1)

The reactant obtained from the Zn bath reaction can be easily pulverized (9) into a mixture of carbonized phases (WC, TaC, TiC, NbC, etc.) and Co (or Ni) It is necessary to pulverize 7 by a ball mill or an attriter or the like in order to reduce the particle size to 탆 or less.

Suitable carbides (WC, TaC, TiC, NbC, etc.) are required in order to produce the carbide boring bars of the present invention using pulverized cemented carbide powders undoped to 10 탆 or less obtained from such milling (7) And (9) steps of adding and mixing in consideration of the kind and amount of the binder (Co, Ni) are required.

The cemented carbide powder in which the carbides (WC, TaC, TiC, NbC, etc.) and the binder (Co, Ni) are assembled in the assembly step is compression molded (11) at a pressure of 10 ton / (13) to produce a specific sintered body.

In the present invention, the sintered waste cemented primary sintered by the above-described sintering step is cut and turned to form a rod, and then subjected to secondary sintering at a high temperature of 1400 ° C or higher to obtain a rod-shaped sintered body.

The cemented carbide rod sintered secondarily is polished (15) and polished to an appropriate size that can be used at the work site.

In the cemented carbide rod polished to an appropriate size in the polishing step, a cemented carbide boring bar head 19 produced by using a cemented carbide is brazed and adhered to obtain a usable carbide boring bar 21, ), It is preferable to use brass as the brazing material.

As described above, according to the present invention, a boring bar is manufactured by using a scrap of a cemented carbide, so that precision machining using a carbide tip can be performed in precision machining while manufacturing cost is reduced by using a low cost cemented carbide.

1: Waste cemented carbide Scrap 5: Zinc bath reaction
7: fine grinding 9: assembly
11: compression molding 17: brazing
19: Boring bar head

Claims (2)

The scrap of scrapped cemented carbide is collected and coarse ground, zinc bath step is performed,
A step of finely pulverizing and assembling the recovered waste cemented carbide powder through the zinc bath step,
The step of compressing and sintering the pulverized and assembled pulverized cemented carbide powder is carried out by the above step,
The step of polishing the sintered body sintered in the above step is carried out,
Wherein the step of brazing the boring bar head to the sintered body polished immediately after boring to complete the carbide boring bar is carried out. 2. The method according to claim 1, wherein the zinc cobalt step is carried out by pulverizing the scrap (1) to 10 mm or less, placing it in an alumina crucible together with a zinc ingot, heating it in an electric furnace in an inert atmosphere at 700 to 1100 deg. (Co) or nickel (Ni) is eluted into molten zinc (Zn) to form a Zn-Co (Ni) alloy phase, the temperature is raised again to 1000 ° C or higher and then heated to about 2.5x10 -2 torr. (WC, TaC, TiC, NbC) and Co and Ni as binders,
The reactant obtained in the Zn bath step is pulverized to 1 mm or less and further finely divided into 10 탆 or less and then the carbide (WC, TaC, TiC, NbC) and the binder (Co and Ni) Pressure squeezed in a reducing atmosphere of at least 1100 占 폚, processed into a bar shape, and then subjected to secondary sintering by vacuum heating to a high temperature of 1400 占 폚 or higher,
Wherein the boring bar obtained by polishing the sintered body obtained in the sintering step is brazed and fixed with a brass material.
KR1020160029018A 2016-03-10 2016-03-10 Producing method of cemented carbide boring bar KR101928523B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109439994A (en) * 2018-12-12 2019-03-08 长沙黑金刚实业有限公司 A kind of grinding-material and preparation method, application method and product obtained

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100017830A (en) * 2007-05-21 2010-02-16 케나메탈 아이엔씨. Cemented carbide with ultra-low thermal conductivity
KR20150106126A (en) * 2014-03-11 2015-09-21 한국세라믹기술원 Method for preparing high-purity ammonium paratungstate using waste super hard metal scrap

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100017830A (en) * 2007-05-21 2010-02-16 케나메탈 아이엔씨. Cemented carbide with ultra-low thermal conductivity
KR20150106126A (en) * 2014-03-11 2015-09-21 한국세라믹기술원 Method for preparing high-purity ammonium paratungstate using waste super hard metal scrap

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109439994A (en) * 2018-12-12 2019-03-08 长沙黑金刚实业有限公司 A kind of grinding-material and preparation method, application method and product obtained
CN109439994B (en) * 2018-12-12 2021-08-10 长沙黑金刚实业有限公司 Grinding material, preparation method, use method and prepared product

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