US1984841A - Agent for polishing, sharpening, and grinding articles of great hardness - Google Patents

Agent for polishing, sharpening, and grinding articles of great hardness Download PDF

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Publication number
US1984841A
US1984841A US672808A US67280833A US1984841A US 1984841 A US1984841 A US 1984841A US 672808 A US672808 A US 672808A US 67280833 A US67280833 A US 67280833A US 1984841 A US1984841 A US 1984841A
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United States
Prior art keywords
agent
polishing
grinding
sharpening
great hardness
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Expired - Lifetime
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US672808A
Inventor
Reichmann Reinhold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens and Halske AG
Siemens AG
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Siemens AG
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Publication of US1984841A publication Critical patent/US1984841A/en
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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
    • B24D3/008—Abrasive bodies without external bonding agent

Definitions

  • My invention relates to an agent for polishing, sharpening and grinding articles of great hardness, particularly hard alloys.
  • Silicon carbide belongs to the class of the 5 hardest grinding materials extensively in use. It is employed, particularly in grinding the so-called hard alloys and metallic carbides which are known in the market under various names. The good grinding eilect as a result of the great hardness of the silicon carbide is, however, im-
  • the crystals are united by means of an argillaceous binding agent, the strength or which is very slight as compared to the strength of the crystals.
  • the crystals are easily pulled apart when machining very hard materials, and the structure is subjected to deterioration, thus causing not only a considerable wear of the grindstones but also reducing the grinding emciency to a minimum.
  • the object of my present invention is, therefore, to employ as polishing and grinding agent for articles of great hardness the purest possible beryllium oxide sintered at a temperature above 1700 C.
  • l Beryllium oxide has hitherto been employed chiefly in the manufacture of refractory crucibles.
  • its adaptability as polishing and grinding agent for articles 0! great hardness has not been recognised heretofore.
  • the use oi beryllium oxide in the iorm oi solid bodies such as grindstones and the like is of particular advantage.
  • the particles of the beryllium'oxide maybeunitedbyamaterialwhichisalsosintered at a high temperature, such as aluminium oxide.
  • a still-more compact structure is attained it only the pure particles 0! beryllium oxide are shaped, for instance with the aid of .1700 C., for instance,
  • the bodies obtained in the above described manner may not only be utilized for grinding hard metallic alloys and similar materials but they also lend themselves to the grinding and polishing of articles consisting of sintered metallic oxides, for instance, highly sintered aluminium oxide, which owing to itsgreat hardness,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Description

Patented Dec. 18, 1934 PATENT OFFICE AGENT FOR POLISHING, SHZLBPENING, AND
GRINDING ARTICLES OF GREAT HARD- NESS Reinhold Ieeiclunan'n, Berlin, Germany, I
to Siemens & m tion oi Germany aligns! Halske, Aktiengesellschalt. Siet, near Berlin, Germany, a m- No Drawing. Application May 25, 1933, Serial Germany No. 672,808. In
May 30, 1932 4 Claims. (C1. 51-219) My invention relates to an agent for polishing, sharpening and grinding articles of great hardness, particularly hard alloys.
Silicon carbide belongs to the class of the 5 hardest grinding materials extensively in use. It is employed, particularly in grinding the so-called hard alloys and metallic carbides which are known in the market under various names. The good grinding eilect as a result of the great hardness of the silicon carbide is, however, im-
paired due to the fact that the crystals are united by means of an argillaceous binding agent, the strength or which is very slight as compared to the strength of the crystals. The crystals are easily pulled apart when machining very hard materials, and the structure is subjected to deterioration, thus causing not only a considerable wear of the grindstones but also reducing the grinding emciency to a minimum.
The object of my present invention is, therefore, to employ as polishing and grinding agent for articles of great hardness the purest possible beryllium oxide sintered at a temperature above 1700 C. l Beryllium oxide has hitherto been employed chiefly in the manufacture of refractory crucibles. However, its adaptability as polishing and grinding agent for articles 0! great hardness has not been recognised heretofore. The use oi beryllium oxide in the iorm oi solid bodies such as grindstones and the like is of particular advantage. In this case the particles of the beryllium'oxide maybeunitedbyamaterialwhichisalsosintered at a high temperature, such as aluminium oxide. However, a still-more compact structure is attained it only the pure particles 0! beryllium oxide are shaped, for instance with the aid of .1700 C., for instance,
a moldable slip or by pressing and if the resulting bodies are sintered at a temperature above between 1900' C. and is continued 2000 C. II the sintering process for a sumciently long time at a high temperature the body is considerably. solidified by the coalescence oi the crystals.
The bodies obtained in the above described manner may not only be utilized for grinding hard metallic alloys and similar materials but they also lend themselves to the grinding and polishing of articles consisting of sintered metallic oxides, for instance, highly sintered aluminium oxide, which owing to itsgreat hardness,
could hardly be machined in the past. The agent,
however, may also be utilised in a pulverized form.
I claim: '1. An agent for polishing, sharpening and purity.
RIINHOLD an abrasive body of
US672808A 1932-05-30 1933-05-25 Agent for polishing, sharpening, and grinding articles of great hardness Expired - Lifetime US1984841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1984841X 1932-05-30

Publications (1)

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US1984841A true US1984841A (en) 1934-12-18

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