BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS
Examples of the realisation of the invention are explained in more detail by means of drawings in the following.
FIG. 1 shows a two-piece duplex tooth-form milling cutter of the present invention in a disassembled position.
FIG. 2 shows a perspective partial view of a sub-disc of the tooth-form milling cutter of FIG. 1.
FIG. 3 shows an one-piece tooth-form milling cutter of the present invention in a perspective representation.
FIG. 4 shows the side view of the tooth-form milling cutter disc of FIG. 3 in a partial view.
FIG. 5 shows schematically a channel system for an inside cooling of a mill cutting tool of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
While this invention may be embodied in many different forms, there are described in detail herein a specific preferred embodiment of the invention. This description is an exemplification of the principles of the invention and is not intended to limit the invention to the particular embodiment illustrated
In FIG. 1, a duplex tooth-form milling cutter is depicted with two disc-shaped main bodies 12, 14, which are assembled coaxially or concentrically, respectively, wherein screws 16 of the main body 14 co-operate with not shown threaded bores of the main body 12 in order to connect the sub-discs 12, 14 into one unit. The sub-discs 12, 14 have coaxial through bores 18, 20, wherein the through bore 18 is in communication with two opposing connection channels 22, 24 which are machined radially into the main body 14. The connection channels 22, 24 can communicate with channels in a spindle or a shaft, which is a part of the machine tool, and which communicate with a source for cooling fluid. For instance, the cooling fluid is a gas or a liquid, respectively.
On the other end, the connection channels 22, 24 communicate with a ring channel 26, which is concentrically machined on the inner side of the disc-shaped main body 14.
On the perimeter of the disc-shaped main bodies 12, 14, accommodation pockets are formed for the accommodation of cutting inserts 28 or 30, respectively, which are fixed in the accommodation pockets by screwing. The cutting inserts 28, are alternately arranged on the perimeter of the main bodies 12, 14. Chip spaces 32, 34 are associated to the cutting inserts 28, 30.
In FIG. 2, the inner side of the main body 12 is depicted with threaded bores 36 for the accommodation of the screws 16. Even in the main body 12, a ring channel 26 is formed and diametrically opposing connection channels 22, 24 are provided, which are brought into coincidence with the connection channels 22, 24 when the main bodies 12, 14 are set against each other.
As can be seen from FIG. 2 in particular, bore portions are formed between the ring channel 26 and the chip spaces, from which the end can be recognised in the chip space 34 at 38 and the beginning in the ring channel 26 at 40, for instance. When a cooling fluid is supplied under pressure via the not shown spindle or shaft, it reaches the connection channels 22, 24 and from there the ring channel 26, and from the latter it can flow to the chip spaces 32, 34 of the disc-shaped main bodies 12, 14 via the numerous bore portions, in order to cool the cutting edges of the cutting inserts in a suitable manner.
As can be recognised, the connection channels 22, 24 and also the ring channel 26 can be made by simple mill cutting processing. Only the bore portions have to be made with drilling tools. As the bore portions are short, they can be arranged on the optimal location for providing an efficient cooling.
In FIGS. 3 and 4, an one-piece form milling cutter 50 is depicted with a disc-shaped main body 52 and a separate attachment flange 54, which is connected to the main body 52 via a suitable screw joint, to which will not be incurred in more detail. Again, on the perimeter of the main body 50 sit alternately cutting inserts 56, as is per se known, to which chip spaces 58 are associated. In the main body 52, diametrically opposing connection channels 60, 62 are formed, which communicate with the central through bore 64 and on the other end with a ring channel 66. The ring channel 66 on its part communicates with bore portions which turn out in the chip spaces 58. The orifice end can be recognised at 68 and the beginning at 70 in FIG. 4. The cooling principle or the channel system, respectively, is comparable to that one of FIGS. 1 and 2.
In FIG. 5, a main body for a mill cutting tool is indicated at 80, without details being shown. One recognises the central through bore 82 for the accommodation of a spindle or a shaft. The through bore 82 communicates with four connection channels 84, which are machined into the side surface of the main body 80. They extend slightly deflected in an arcuate form from the radius, which runs through the beginning point of the connection channels 84. The connection channels 84 communicate with a ring channel 86, from which bore portions 88 run to individual, not shown chip spaces. As can be recognised, the end of the connection channel 84 is arranged approximately between two bore portions 88, so that the cooling fluid flowing through the connection channel 84 does not immediately hit a bore portion 88. In addition, the bore portions 88 run slantly to the ring channel 86, so that the deflection of the fluid takes place about an angle of <90°. Through this, a suction nozzle effect in the flow of the fluid in the ring channel 86 is prevented, which otherwise would aspirate air via the bore portions 88.
Moreover, the connection channels 84 and also the bore portions 88 can have a diminution of the flow area near to their downstream end, in order to increase the fluid in its velocity and with this the pressure.
Preferably, the bore portions have a very small diameter in order to avoid cloggings. Moreover, it is obvious that a sufficient sealing is existent for the assembly of the sub-discs in the embodiments of FIGS. 1 to 4, which takes care that the fluid flows only in the preset channel system and does not escape to the exterior, except at the locations provided for this.
As can be recognised without further ado, the channel system can be manufactured very simply. In addition, the channels and bores can be made without fins to a large extent, so that resistances do not impede the flow of the cooling fluid.
The above disclosure is intended to be illustrative and not exhaustive. This description will suggest many variations and alternatives to one of ordinary skill in this art. All these alternatives and variations are intended to be included within the scope of the claims where the term “comprising” means “including, but not limited to”. Those familiar with the art may recognize other equivalents to the specific embodiments described herein which equivalents are also intended to be encompassed by the claims.
Further, the particular features presented in the dependent claims can be combined with each other in other manners within the scope of the invention such that the invention should be recognized as also specifically directed to other embodiments having any other possible combination of the features of the dependent claims. For instance, for purposes of claim publication, any dependent claim which follows should be taken as alternatively written in a multiple dependent form from all prior claims which possess all antecedents referenced in such dependent claim if such multiple dependent format is an accepted format within the jurisdiction (e.g. each claim depending directly from claim 1 should be alternatively taken as depending from all previous claims). In jurisdictions where multiple dependent claim formats are restricted, the following dependent claims should each be also taken as alternatively written in each singly dependent claim format which creates a dependency from a prior antecedent-possessing claim other than the specific claim listed in such dependent claim below.
This completes the description of the preferred and alternate embodiments of the invention. Those skilled in the art may recognize other equivalents to the specific embodiment described herein which equivalents are intended to be encompassed by the claims attached hereto.
Patent Application
20080063482
