Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1998-03-18
1999-04-06
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
279 20, 408 56, 408 57, 409136, B23B 3500
Patent
active
058908498
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a tool holder for tools supplied with coolant or lubricant according to the preamble of claim 1 and to a cooling or lubricating process according to process claim 22. The invention relates in particular to a tool holder for rotating chip-removing tools such as boring, milling, reaming or thread-cutting tools. It must already be mentioned at this place, however, that the invention is not limited to this field of use. The field of use relates to the entire technique of chip removal in which the tool lips are subject to particularly severe thermal and/or mechanical load.
The heat generated at the lip during chip removal is in many cases removed by selective supply of coolant or lubricant. Whereas separate lubricant lines routed along the body of the machine tool and having exit nozzles directed at the lip have been used in the past, an increasing practice in recent years has been to pass the coolant or lubricant through internal ducts in the tool directly to the tool lip. Not only does this permit savings in coolants or lubricants, but also it yields the further benefit that coolants or lubricants can be supplied at much higher pressures to points subject to particularly severe thermal loads.
In order to further reduce the coolant or lubricant flow in view of the progressively more strict environmental protection requirements, the development of modern tools is aimed at using the coolant or lubricant even more selectively, for example by placing the outlet opening of coolant or lubricant ducts contained in the tool in the immediate vicinity of the lip. Furthermore, attempts are being made to use, in the region of the lip or lip carrier, new materials which can get by with substantially lower coolant or lubricant flows. In this connection, dry or pseudo-dry machining tools have been designed that can be used even in machine tools that do not have a separate lubricant or coolant supply.
Dry and pseudo-dry machining is now progressively gaining acceptance in production engineering. However, this form of machining cannot be achieved for all tools and especially not for all cutting conditions, i.e., feed rates, speeds, etc. Since machine tools are routinely equipped with a plurality of the most diverse tools, however, flexibility is also required with respect to the coolant and lubricant supply of the tool.
The object of the invention is therefore to provide a tool holder according to the preamble of claim 1 which makes it possible to use a broad spectrum of tools having diverse coolant or lubricant needs even in machine tools designed for pure dry machining.
This object is achieved by the tool holder according to claim 1.
According to the invention, a tool holder that can be handled as a tool-system module is created that is autonomous with respect to the coolant or lubricant supply for the tool to be chucked or held. In other words, the tool holder according to the invention is used as replacement for the relatively complex line systems heretofore necessary for the supply of coolant or lubricant in known machines. As a result, tools that must be operated with or without coolant supply, depending on service conditions such as cutting speed or feed rate, can be used on machine tools without coolant or lubricant supply in order to achieve optimum chip-removal performance. The tool holder according to the invention therefore considerably increases the flexibility of production by chip removal, and can be very easily integrated into existing tool systems. Because the coolant or lubricant reservoir is fillable, the overall space needed by the tool holder can be reduced, thus opening the possibility of operating the tool holder even with extremely high speeds of up to 30,000 rpm, for example. The metering unit according to the invention permits very economic use of coolant or lubricant, thus benefiting environmental protection. According to the invention, therefore, it is possible, for example, to pilot the metering unit such that lubricant or coolant reaches the most severely loaded lip zones
REFERENCES:
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patent: 4517768 (1985-05-01), Hausermann et al.
patent: 4555047 (1985-11-01), Ackley
patent: 4642005 (1987-02-01), Kondo et al.
patent: 5419661 (1995-05-01), Meachum
patent: 5800104 (1998-09-01), Miyano
Gottlieb Guehring KG
Howell Daniel W.
Smith Monica
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