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US 6,655,882 B2Granted
Twist drill having a sintered cemented carbide body, and like tools, and use thereof
AssigneeKennametal Inc.
InventorsHans-Wilm Heinrich, Manfred Wolf, Dieter Schmidt
Life of this patent
Estimating the term…
Abstract
There is now provided a twist drill having an elongate body at a first end, a shank at a second and opposite end, the elongate body and the shank sharing a common axis, at least one face on the elongate body at an end opposite the shank, wherein the at least one face defines a corresponding flute extending along the elongate body toward the shank, at least one flank on an end of the elongate body at an end opposite the shank, and a cutting edge at a juncture of the at least one face and the at least one flank, and the like tools, having a sintered cemented carbide body, and the use thereof in material removing and dislodging tools.
Claims23
A twist drill having a central longitudinal axis, said twist drill comprising:
- a cutting tip being configured to impact a material to be drilled to initiate drilling of the material;
- a shank portion being configured to be inserted into and held in a chucking arrangement for a drill;
- a fluted portion being disposed between and to connect said tip portion and said shank portion;
- said fluted portion comprising:
- a first chip flute and a second chip flute;
- said first chip flute and said second chip flute being substantially symmetric with respect to one another and substantially helically disposed about said central longitudinal axis;
- a first cutting edge being disposed between said cutting tip and said first chip flute;
- a second cutting edge being disposed between said cutting tip and said second chip flute;
- said first cutting edge and said second cutting edge being substantially symmetric with respect to one another about said central longitudinal axis;
- said first chip flute being disposed to extend helically along said fluted portion from said first cutting edge;
- said second chip flute being disposed to extend helically along said fluted portion from said second cutting edge;
- at least a portion of said cutting tip and at least a portion of said fluted portion comprise a tool portion having an interior and an exterior;
- and
- said tool portion comprising:
- a cermet body configured to engage material to remove or dislodge material;
- said cermet body comprising at least one hard component and a binder;
- said binder comprising:
- cobalt in the range of from about forty weight percent to about ninety weight percent;
- nickel in the range of from about four weight percent to about thirty-six weight percent;
- and
- iron in the range of from about four weight percent to about thirty-six weight percent;
- said binder having a ratio of nickel to iron in the range of about 1.5:1 to about 1:1.5;
- said binder in said body having a first concentration at a first portion and a second concentration at a second portion;
- said first concentration in said first portion being substantially different from said second concentration in said second portion to thus form a gradient in said body;
- said binder comprising a substantially face centered cubic structure, with the difference in concentration between said first concentration and said second concentration of said binder in said body being configured and disposed to substantially maintain said face centered cubic structure of said binder upon said binder being subjected to plastic deformation;
- and
- the difference in concentration between said first concentration and said second concentration of said binder in said body also being configured and disposed to minimize stress and strain induced transformations in said binder, and to maximize fatigue resistance and toughness in said body.
24 more elements
A tool having a material engaging and manipulating portion configured to remove or dislodge material, said tool comprising one of:
- a drill, an endmill, a reamer, a threading tool, a threading tap, a material cutting insert, a milling insert, an indexable insert, a material cutting insert with a chip control structure, a material milling insert with chip control structure, an earth auger, a mineral drill, a rock drill, a snow plow blade, a roller cutter, a grinding apparatus, a comminuting apparatus, a seed boot, a disc blade, a stump cutter, a grinder, a furrowing tool, a screw head punch;
- said tool comprising:
- a cermet body configured to engage material to remove or dislodge material;
- said cermet body comprising at least one hard component and a binder;
- said binder comprising:
- cobalt in the range of from about forty weight percent to about ninety weight percent;
- nickel in the range of from about four weight percent to about thirty-six weight percent;
- and
- iron in the range of from about four weight percent to about thirty-six weight percent;
- said binder having a ratio of nickel to iron in the range of about 1.5:1 to about 1:1.5;
- said binder in said body having a first concentration at a first portion and a second concentration at a second portion;
- said first concentration in said first portion being substantially different from said second concentration in said second portion to thus form a gradient in said body;
- said binder comprising a substantially face centered cubic structure, with the difference in concentration between said first concentration and said second concentration of said binder in said body being configured and disposed to substantially maintain said face centered cubic structure of said binder upon said binder being subjected to plastic deformation;
- and
- the difference in concentration between said first concentration and said second concentration of said binder in said body also being configured and disposed to minimize stress and strain induced transformations in said binder, and to maximize fatigue resistance and toughness in said body.
12 more elements
A tool comprising one of:
- a drill, an endmill, a reamer, a threading tool, a threading tap, a material cutting insert, a milling insert, an indexable insert, a material cutting insert with a chip control structure, a material milling insert with chip control structure, an earth auger, a mineral drill, a rock drill, a snow plow blade, a roller cutter, a grinding apparatus, a comminuting apparatus, a seed boot, a disc blade, a stump cutter, a grinder, a furrowing tool, a screw head punch, an endmill, a tap, a burr, a countersink, a hob, and a reamer;
- said tool comprising:
- a cermet body;
- said cermet body comprising at least one hard component and a binder;
- said binder comprising:
- cobalt in the range of from about forty weight percent to about ninety weight percent;
- nickel in the range of from about four weight percent to about thirty-six weight percent;
- and
- iron in the range of from about four weight percent to about thirty-six weight percent;
- said binder having a ratio of nickel to iron in the range of about 1.5:1 to about 1:1.5;
- said binder in said body having a first concentration at a first portion and a second concentration at a second portion;
- said first concentration in said first portion being substantially different from said second concentration in said second portion to thus form a gradient in said body;
- said binder comprising a substantially face centered cubic structure, with the difference in concentration between said first concentration and said second concentration of said binder in said body being configured and disposed to substantially maintain said face centered cubic structure of said binder upon said binder being subjected to deformation;
- and
- the difference in concentration between said first concentration and said second concentration of said binder in said body also being configured and disposed to minimize stress and strain induced transformations in said binder.
12 more elements
Dependencies are inferred from the claim text.