Back to results
US 9,114,462 B2Granted
Drill and a production method for a drill
AssigneeHilti Aktiengesellschaft
InventorsArno Glaser, Steven Moseley
Life of this patent
Estimating the term…
Abstract
A drill includes a drill bit, an intermediate part, and a shaft. The drill bit is made from a sintered carbon-containing hard metal. The intermediate part is made from steel and arranged along an axis between the drill bit and the shaft. An activity of carbon in the steel of the intermediate part is greater at a temperature ranging from 1100° C. to 1450° C. than an activity of carbon in the sintered hard metal at the temperature.
Claims19
A drill, comprising:
- a drill bit that includes a sintered hard metal, wherein the sintered hard metal includes carbon;
- a shaft;
- and
- a sintered intermediate part that is iron-based,
- wherein the sintered intermediate part is arranged along an axis between the drill bit and the shaft, and
- wherein an activity of the carbon in the sintered intermediate part in a temperature range from 1100° C. to 1470° C. is greater than or equal to the activity of the carbon in the sintered hard metal in the temperature range.
3 more elements
A method for producing a drill, comprising:
- forming a green body from a hard metal and a binder into a drill bit, wherein the hard metal includes carbon;
- forming an intermediate part from an iron-based powder that includes carbon;
- joining the drill bit and the intermediate part into a semi-finished product;
- sintering the semi-finished product at a temperature at which an activity of the carbon in the intermediate part is greater than or equal to the activity of the carbon in the green body;
- and
- joining the sintered semi-finished product onto a shaft in a material-to-material fashion.
3 more elements
A drill assembly, comprising:
- a drill bit that includes a sintered hard metal;
- a shaft disposed between the drill bit and a sintered intermediate part;
- and
- the sintered intermediate part that is iron-based,
- wherein the sintered hard metal and the intermediate part include carbon, wherein an activity of the carbon in the sintered intermediate part at a particular temperature in a temperature range from 1100° C. to 1470° C. is greater than or equal to the activity of the carbon in the sintered hard metal at the particular temperature.
2 more elements
Dependencies are inferred from the claim text.