Cutting – Means to drive or to guide tool – With simple rectilinear reciprocating motion only
Patent
1993-04-19
1994-07-12
Jones, Eugenia
Cutting
Means to drive or to guide tool
With simple rectilinear reciprocating motion only
83694, 76DIG11, B26D 108
Patent
active
053278062
ABSTRACT:
For shear-cutting a stack of thin strips of amorphous steel along a cutting plane that extends transversely of the stack, an apparatus that comprises two blades that are positioned at the start of a cutting operation on opposite sides of the stack is utilized. Each of the blades has a first surface for engaging one side of the stack and a second surface extending transversely of the first surface and generally parallel to said cutting plane and intersecting the first surface at a corner. The first surface of each blade is disposed at a predetermined rake angle with respect to a reference plane extending through a point on the corner of the blade and normal to said cutting plane. The apparatus is further characterized by the following features that cooperate to impart to the blades an exceptionally high resistance to wear: (i) the sum of the rake angles is of a negative value and between 5 and 35 degrees, and (ii) both blades are of a cemented carbide cutting material that consists essentially of tungsten carbide particles and cobalt particles compacted under high pressure and sintered at a temperature exceeding the melting point of the cobalt, the tungsten carbide particles being, on average, of submicron size and the cobalt constituting more than 15 percent and about 16 percent by weight of the cutting material.
REFERENCES:
patent: 4705124 (1987-11-01), Abrahamson et al.
patent: 4942798 (1990-07-01), Taub et al.
patent: 4947945 (1990-08-01), Griffin
patent: 4971485 (1990-11-01), Nomura et al.
patent: 5068148 (1991-11-01), Nakahara et al.
Two-page document from Fansteel Hydro Carbide, Latrobe, Pa., comprising one page entitled "Grade Specifications" and a second page entitled Properties and Applications. Received by applicant in Feb. 1991.
One-page document prepared by or for Fansteel Hydro Carbide, Latrobe, Pa., entitled "Preliminary-Grade Specification", refers to HC-US16 material and shows a date of Feb. 1, 1989. Publication status unknown. Received by Applicant in Dec. 1991.
Wilson, "Tool Engineers Handbook", 1950, published by McGraw-Hill, pp. 14-12 through 14-14.
Freedman William
General Electric Company
Jones Eugenia
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