Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
  • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
  • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
  • B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
  • B24D3/08—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for close-grained structure, e.g. using metal with low melting point
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12201—Width or thickness variation or marginal cuts repeating longitudinally
  • Y10T428/12208—Variation in both width and thickness

Definitions

• the flow process leads to a covering of the oper ating edges of the diamond grains and thereby prematurely reduces the capacity of the tool.
• the binder alloy is of great importance for the functioning of the hard cutting or grinding grains.
• the use ofmetals with a low melting point Tools of such mixtures are of of various types, can be used for the new binder alloy.
• the cobalt in the compound C03W3C can be replaced either entirely or partly by suitable quantities of nickel, iron or manganese while the favorable properties of this compound are retained.
• the metallic binder for the hard cutting or grinding grains which amount to 5 to per cent of the total mixture, and which may consist of boron carbide grains or silicon carbide grains in addition to the diamond grains, consists according to the present invention of a chemical compound of cobalt, tungsten and carbon in accordance with the formula COsWsC. Thorough chemical and metallographic investigations have shown that this particular chemical compound of cobalt, tungsten and carbon has such a small tendency toward flowing that a covering of the operating edges of the grinding grains by the binder is avoided. Moreover this compound has such a" high hardness ,that it is not removed prematurely during the operating process.
• Cutting and grinding tools which are manufactured according to the invention with the application of the compound COaWaC as the binder therefor retain their capacity in a uniform manner until the natural dulling oi the grinding grains subsides.
• the binder alloy to be-used according to the invention greatly resembles pure cobalt so that the-known operating methods for the manufacture of cutting 7 tools and tools as well as implements
• the manufacture of the above-mentioned compound COaWsC or the corresponding nickel, iron or manganese compounds can take place by mixing the individual materials and sintering or melting them together until the reaction occurs. The converted mass is then crushed and ground.
• the mixtures are pressed in a known manner or formed according to other methods, where upon they are sinteredat temperatures between 1300 and 1700 C.
• the sintering can take place without mechanical pressure but it is also possible to place the mixtures in carbon molds and heat the mixture therein under pressure until the sintering is completed.
• the carbon mold may have a shape corresponding to the desired molded bodies, for instance corresponding to a grinding ring, a rectangular cutting tip or a round straightening tool.
• Alloys of the above-mentioned composition may serve as grinding disks, for instance for finishing hard metals, glasses or other hard materials, or grinding tools of other types, like manual lapping tools, straightening tools and also for cutting tools which are used for turning, boring or milling.
• the grain size with which the diamond, the boron carbide or the silicon carbide is to be used depends on the purpose for which the tool will be used. For rough turning or finishing work, grains up to 1 mm. can be utilized.
• a tool consisting of diamonds and a metallic binder, characterized by the fact that the metalaaeaeoe lic binder consists of a chemical compound of cobalt, tungsten and carbon in accordance with the formula COaWsC.
• a tool according to claim 1 characterized by the fact that high melting point carbides are added either individually or in mixtures, to the mixture of diamonds and binding metal, in order to adapt the material for different purposes, said carbide addition comprising up to about three times that of the compound CoaWaC and said diamonds constituting about 5 to 25% by weight of said tool.
• a tool comprising hard cutting particles embedded in a metallic binder therefor, said tool being characterized by the fact that said binder is a chemical compound having the formula COaWaC. Y

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Inorganic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7993671

Family Applications (1)

Country Status (2)

Cited By (5)

Families Citing this family (1)

Family Cites Families (2)

• 1939
  • 1939-05-21 DE DEK2761D patent/DE919669C/de not_active Expired
• 1940
  • 1940-06-08 US US339589A patent/US2285909A/en not_active Expired - Lifetime

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