Abrading – Machine – Combined
Patent
1996-03-08
1998-03-10
Rose, Robert A.
Abrading
Machine
Combined
451454, 451452, B24B 5504
Patent
active
057254184
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a grinding unit for manufacturing standardized tools such as slot cutters, reamers, twist drills, screw-taps, or the like.
Since such tools consist of high-quality tool steels, it is particularly important to prevent an overheating of the workpiece during grinding by furnishing great amounts of coolants. Since the aforementioned tools are normally provided with axial or helical grooves, the known grinding machines are designed as universal tool grinding machines which provide adjusting possibilities for the grinding spindle and the grinding wheel in order to grind the necessary grooves into the workpiece at various angles, as well to grind the workpiece circularly or to relief-grind the cutting edges.
In order to perform the necessary workpiece movements with regard to the grinding wheel, the grinding machines are provided with drives which may be strictly mechanical by providing guide elements exerting the required rotating movement for the grinding of helically grooved tools.
With CNC-controlled grinding machines, the movements of the workpiece and the grinding wheel are not necessarily effected mechanically but by electrically controlled servomotors.
The known grinding machines for grinding tools are in detail provided with a machine holder on which the elements necessary for the grinding process are arranged. The entire machine is surrounded by a hood in order to contain the coolant and to protect the operating personnel. In addition to the actual grinding machine, also peripheral devices are required such as hydraulic units, a coolant unit and an electrical unit. This means, that the known grinding machines require a substantial amount of space which is neither smaller with CNC-controlled grinding machines since the structure of the grinding machine is in principle the same and the peripheral devices are also necessary.
It is the object of the invention to provide a grinding unit that is particularly oriented to the manufacture of standard tools such as slot cutters, reamers, twist drills, screw-taps, or the like, requires little space, and can be easily exchanged as a unit for being adjusted to various tools to be manufactured, or, is provided with exchangeable elements for an adjustment to various tools.
SUMMARY OF THE INVENTION
Based on this object, a grinding unit is proposed that comprises according to the invention a grinding spindle holder that can be mounted on a support, at least one grinding spindle that is mounted on the grinding spindle holder and has a grinding wheel, a carriage that is movable on guides on the grinding spindle holder, a workpiece holder that is movable transversely to the carriage movement on guide means on the carriage, and a protective housing that is mounted on the carriage and that surrounds the workpiece holder and the grinding wheel tightly.
The inventive grinding unit can be mounted on any base, particularly on an already existing coolant unit so that no machine holding device is required and the required space is reduced. The inventive grinding unit can be built compactly and requires a small-dimensioned internal space within the protective housing because of the protective housing surrounding tightly the workpiece holder and the grinding wheel, so that it is possible to introduce into the protective housing a protective gas which displaces the oxygen so that an overheating of the surface of the workpiece because of the oxygen in the air is prevented.
The grinding spindle mounted on the grinding spindle holder is not adjustable but set for grinding a particular workpiece.
By the arrangement of a carriage that is movable on the grinding spindle holder on guides, the feed-motion of the workpiece relative to the grinding wheel is achieved while the advance, if necessary in connection with a rotation of the workpiece for grinding helical grooves, is made possible by the workpiece holder which is displaceable on guide means on the carriage, transversely to the carriage movement.
A grinding spindle with a horizon
REFERENCES:
patent: 2572212 (1951-10-01), Stebelton et al.
patent: 3830019 (1974-08-01), Mann
patent: 4069624 (1978-01-01), Henry, Jr.
patent: 4091571 (1978-05-01), Nilsson
patent: 4991358 (1991-02-01), Giebmanns
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