Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Patent
1997-02-21
1998-11-03
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
408147, 408187, B23B 5110
Patent
active
058299254
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arangement in back spot facing tools, i.e. tools intended to perform machining operations in a direction counter to that customary for the machine in question, such a type of work operation being commonly denoted backspot facing.
In machining operations, a situation sometimes occurs where it is desired to perform machining in the return direction of an ordinary working operation such as a boring operation. A common example of this is carrying out back spot facing or the like operations. Machining today is often performed on fully automatic machiningcenters, where availability of a flowing medium or cutting fluid supplies to the workpiece via the machine spindle, is continually improving and consequently there are also provided opportunities for utilising the flowing cutting fluid to actuate or control tool function.
At present there are tools where the cutting fluid is utilized via small, built-in cylinders and linkages to control tool function, and machine capacity with respect to pressure and flow of cutting fluid is also becoming better and better, sometimes up around 100 bar for good flows. There accordingly arises the possibility of controlling a tool in ways other than the one just mentioned, more specifically by utilizing the effect of the force of a jet emitted by a suitable nozzle, this jet then being caused to actuate or control tool function, which results in many advantages.
The object of the present invention is to achieve an arrangement in a tool of the kind mentioned in the introduction, which has improved performance and greater durability than previously known devices, as well as being simple to manufacture. The distinguishing features of the invention are disclosed in the accompanying claims.
As a result of the invention there has been achieved an arrangement for a tool, the function of which may be controlled with the aid of the force in a jet of cutting fluid. The use of this working principle results in that manufacturing the tool may take place using relatively few component parts, which in turn provides stability and good durability. In addition, there is obtained a self-cleansing effect by the cutting fluid. In the case where the inventive arrangement is adapted for application to numerically controlled machiningcenters, the supply of cutting fluid will be extremely good as it flows through the tool to the cutting site.
The invention will now be described more in detail, with the aid of a preferred embodiment and with reference to the accompanying drawings, where:
FIG. 1 is a schematic side elevation, partly in cross section, of a tool in accordance with the invention. The cutter holder part of the tool is shown in its opening phase while being opened out from its retracted position along the tool shank,
FIG. 2 illustrates the tool of FIG. 1 when the holder part is fully opened out with the cutter in its working position,
FIG. 3 illustrates the tool to an enlarged scale and in partial section, such as to show how the exchangeable nozzle for the cutting fluid is placed, the cutter holder part being retracted here,
FIG. 4 is the same as FIG. 3, but with the holder part in its opened out position,
FIG. 5 is a principle, schematic sketch of the described and illustrated tool according to the embodiment example, where the cutter is in operation,
FIG. 6 is an even more enlarged and explicatory side elevation of the inventive subject, and here may be seen the function of a spring used to keep the cutter holder part in its retracted position when cutting fluid supply is terminated,
FIG. 7 illustrates how the tool, during its working operation, is taken into an existing hole in a workpiece, the cutter holder part being in its retracted position and
FIG. 8 illustrates the tool when its cutter holder part is opened out to its working position with the aid of a cutter fluid jet, thus enabling initiation of machining as illustrated in FIG. 5.
As will be seen from the drawings the tool 1 comprises, in accordance with a preferred embodiment, a cylindrical shank
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patent: 4716657 (1988-01-01), Collingwood
patent: 4850099 (1989-07-01), Scollard
patent: 5135338 (1992-08-01), Heule
H. Granlund Tools KB
Howell Daniel W.
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