Metal working – Plural diverse manufacturing apparatus including means for... – Binding or covering and cutting
Reexamination Certificate
1999-05-10
2001-01-30
Briggs, William (Department: 3722)
Metal working
Plural diverse manufacturing apparatus including means for...
Binding or covering and cutting
C015S320000, C029SDIG007, C029SDIG003, C134S010000, C134S151000, C134S172000, C451S038000
Reexamination Certificate
active
06178610
ABSTRACT:
FIELD OF THE INVENTION
The invention generally relates to metal processing machines and more particuarly, to a device for and a method of removing burrs from metal work-pieces processed on a shavings metal processing machine, wherein the method and device use a high pressure stream of liquid exiting a high pressure nozzle directed at the work-piece to be processed to remove the burrs.
BACKGROUND OF THE INVENTION
A method of and a device for removing burrs from metal work-pieces processed on a metal processing machine are known from DE 195 33 579 A1 (hereinafter DE '579). In the DE '579 reference, the high pressure stream of liquid is an oil emulsion having a high pressure of up to 500 bar. Oil emulsions of the type taught in DE '579 contain a maximum of 10 to 15% oil in water and additives, such as emulsifiers, which allow for the finest distribution of the oil in the water (since oil and water do not tend to mix). The action of removing burrs is achieved specifically by the water, which is heavier than the oil. Most of the current commercially available devices are operated at a maximum of 350 bar. A high pressure stream of liquid comprised mainly of water used at a high pressure maximum of 350 bar is usually sufficient to achieve adequate burr removing and cleaning action. Burr removing and cleaning action, as the DE '579 reference shows, can readily be integrated into the manufacturing process of the work-piece, if carried out in the machine chamber and if the boring and cutting emulsion is used that is already employed for the cooling of the work-piece to be processed.
But there are now ever increasing numbers of metal processing machines being operated using cutting oil or boring oil as the cooling and lubricating medium, where the oil is not finely distributed in the emulsions, but rather is provided as a solution with additives. As a consequence of this, the emulsions only contains a negligible proportion of water.
An object of the present invention is to provide a method of and a device for removing burrs from metal work-pieces processed by metal processing machines, wherein oil can also be employed in the high pressure stream of liquid without any danger and with sufficiently great burr removing and cleaning action.
SUMMARY OF THE INVENTION
The method of and device for removing burrs from metal parts processed by a metal processing machine according to the present invention is characterized by the fact that a high pressure stream of liquid is used which has a proportion of oil greater than 50% and a high pressure greater than 400 bar. The method and device are further characterized in that the high pressure nozzle, along with the work-piece to be processed, are housed in an encapsulated work-piece chamber during processing. Thus, with high pressure greater than 400 bar, sufficient burr removing and cleaning action is achieved using the specifically lighter oil. The housing of the high pressure nozzle and the work-piece to be processed in the encapsulated work-piece chamber results in the fact that an oil mist, generated by the burr removal, does not present the danger of fire or explosion, because the volume of the work-piece chamber is kept small and the work-piece chamber can easily be uncoupled from the machine chamber via a door that can be opened and closed. Furthermore, processes that are being conducted in the work-piece chamber and in the machine chamber do not mutually impair one another. The oil mist cannot exit the machine chamber so as to lead to any build up of dirt.
The safety of the method and device of the present invention is increased even more according to a further design, wherein the work-piece chamber is supplied with carbon dioxide or nitrogen by a supply of gas during the processing of the work-piece.
The device to remove burrs from a metal work-piece processed on a metal shavings removal processing machine, wherein the metal processing machine has at least one processing station in a machine chamber thereof and a high pressure nozzle directed at the work-piece to be processed and supplied with the high pressure stream of liquid, is characterized by the fact that the oil for the high pressure stream of liquid is taken from an oil tank of the metal processing machine, brought up to a high pressure greater than 400 bar via a high pressure generating device, and supplied to the high pressure nozzle housed in a work-piece chamber together with the work-piece, whereby the work-piece chamber is arranged in the machine chamber.
Thus, no additional handling expense is required to remove burrs and to clean the work-piece. The finishing time for the work-pieces is thereby considerably shortened. The loosened burrs are transported away in the metal processing machine in the same way as the metal shavings in the metal removal processing. For this purpose, the work-piece chamber only need be provided with an exiting drain which is connected to the oil drain device of the metal processing machine.
The oil from the oil tank of the metal processing machine is supplied to the high pressure generation device, either directly, or through an intermediate oil for removing burrs from metal work-pieces processed on a metal processing machine.
For larger work-pieces, a plurality of additional high pressure nozzles can be arranged in the work-piece chamber and supplied from the high pressure generating device. The high pressure generating device has an operating direction and a distance to the work-piece to be processed, wherein the operating direction and the distance are adjustable. Multiple high-pressure nozzles can be directed at a single work-piece, or each work-piece of a plurality of work-pieces can have one or more high pressure nozzles allocated thereto.
The design can furthermore be executed such that the high pressure generation device is constructed as a component that is separate from the metal processing machine.
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Piller Thomas
Wankm{umlaut over (u)}ller Rolf
Briggs William
Jansson, Shupe, Bridge, & Munger, Ltd,
Piller Entgrattenchnik GmbH
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