Grinding apparatus for buttons on rock drill bit
AssigneeC.M.E. Blasting & Mining Equipment Ltd.
InventorsBjorn Sjolander, Bo Thomas Sjolander, Robert Sjolander
Life of this patent
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Abstract
The present invention relates to grinding apparatus for grinding the hard metal inserts of rock drill bits, said grinding apparatus having a grinding machine carried on an support system that provides a feed pressure for said grinding machine during grinding, said grinding machine equipped with a grinding pin driven by motor to rotate about its longitudinal axis wherein the grinding cup is rotated at variable speeds and the support system provides a variable feed pressure.
Claims44
A grinding apparatus for grinding working tips of hard metal inserts of rock drill bits, comprising:
- a grinding machine, means for holding a rock drill bit to be ground and a support system,
- the support system having means for providing a controlled variable feed pressure during grinding,
- the grinding machine equipped with a spindle assembly having an output drive shaft having a longitudinal axis, one of a plurality of grinding tools of different sizes and profiles detachably connected to the output drive shaft for grinding different sizes and profiles of working tips, and means for varying and controlling feed pressure and a speed of rotation of the output drive shaft during grinding based on a size of a connected grinding tool.
A method of grinding working tips of hard metal inserts of rock drill bits, comprising:
- providing a grinding apparatus having a grinding machine equipped with an output drive having a longitudinal axis and means to detachably retain one of a plurality of grinding tools for grinding different sizes and profiles of working tips, speed control means for controlling and varying the speed of rotation of the output drive, and a support system, pressure control means on the support system for controlling and varying feed pressure during grinding and means for holding a rock drill bit to be ground;
- inserting the rock drill bit into the means for holding the rock drill bit to be ground,
- determining the size and profile of one or more working tips of the same size and profile, and attaching a grinding tool to the grinding machine corresponding to the size and profile of the one or more working tips,
- selecting a first rotational speed of the output drive and a first feed pressure,
- aligning the grinding tool about the longitudinal axis of said one or more working tips to be ground, grinding said one or more working tips at the first rotational speed and the first feed pressure;
- determining the size and profile of one or more other working tips on the same or a different rock drill bit of a second same size and profile, and attaching a grinding tool to the grinding machine corresponding to the size and profile of the one or more other working tips,
- selecting a second rotational speed of the output drive and a second feed pressure,
- aligning the grinding tool about the longitudinal axis of said one or more other working tips to be ground grinding said one or more other working tips at the second rotational speed and the second feed pressure.
Dependencies are inferred from the claim text.