Title of Invention

CUTTING ELEMENT FOR A CUTTING TOOL

Abstract

The invention concerns a cutting element (1) for a cutting tool (10) such as a drill or rotary cutter, with an approximately cylinder-shaped centre portion (2), on whose one end is situated a cutting edge (3) and on whose other end is a nozzle (4), as well with blades (5) which are developed extending radially from the centre-portion towards the outside, preferably rotation-symmetric to the axis (X) of the centre-portion , which at any given time exhibit front-end (51) facing one of the cutting edge (3) with a rough cutter (6) directed externally and a cutting edge (7) running from the centre-point outward as well as a fastening-side (52) opposite the nozzle (4), whereby the blades (5) are developed with spinal (back) (8) adjacently sloping on the cutting edge (7). As per the invention , it is provided that the blades (5) are developed (formed) reinforced on the fastening- side (52) in a zone (9) corresponding to one of the spinal (back)(8) with approximately similar contour.

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 Of 1970) & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See section 10, Rule 13] CUTTING TOOL; BOEHLERIT GMBH & CO. KG., A CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS OF GERMANY, WHOSE ADDRESS IS DEUCHENDORF - WERK VI, 8605 KAPFENBERG, AUSTRIA AND LEITZ GMBH & CO. KG., A CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS OF GERMANY WHOSE ADDRESS IS LEITZSTRAGE 2, 73447 OBERKOCHEN, GERMANY. THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED. The invention concerns a cutting element for a cutting tool such as a drill or rotary -cutter, with an approximately cylinder-shaped centre-portion , on whose one end sits a cutting tip and on whose other end is situated a nozzle , as well as with blades developed(formed) extending radially outward from the centre-portion, preferably rotationally-symmetric to the axis of the centre-portion , which exhibit at any given time a front end facing the cutting tip with an externally directed rough -cutter and a cutting edge running outward from the centre-portion as well as a fastening-side facing opposite the nozzle, whereby the blades on the front end are developed (formed) with a spinal sloping adjacent on the cutting edge . The rest concerns the invention of a cutting tool with a cutting-element of such kind. Cutting elements of the type mentioned in the beginning were for example installed with shaft rotary cutters or mounting- drills.Such cutting elements were produced according to the state of the technology preferably through Powder-Injection-Moulding (PIM) or produced powder-spray sprinkling and subsequently brought into a condition fit for use through grinding/polishing. With increasing usage or duration of usage it is then also necessary to re-sharpen the cutting edges. Although the cutting elements in PIM-process can also be created especially through abrasion-resistant hard metals ( cutting alloys ), yet this process showed the disadvantage that on the one hand it is expensive and on the other hand often with the production , especially within the framework of the necessary (inevitable) treatment of the greenhorn , a delay of the rough parts of the cutting element appeared. With known cutting elements also it is not taken into consideration, that in usage through the regularly required re-grinding or sharpening of the cutting edge , which compulsorily brings about a wearing away of hard-metal from the cutting- element, a non-compensatible weakening of the same is given, with the post disadvantage , that after a few re-grinding operations it can no more withstand high cutting- loads. Here the invention assigns and carries out the task , to indicate a cutting element of the type mentioned at the outset, which is essentially producable without delay and re-grindable repeatedly , without losing its stability. A further objective of the invention consists therein, to indicate a cutting tool of the type mentioned at the outset, whose cutting element is re-grindable repeatedly, without fearing breaking of the cutting element. The first objective of the invention is achieved thereby, that with a cutting element of the type mentioned at the outset, the blades are developed (formed) reinforced on the fastening-side in a zone corresponding to the spinal (back) with approximately similar contour. As has already been taken into consideration by the inventors, delay-free cutting elements should be able to be produced, when in place of a PIM-process a customary compressing by hard-metals, followed by a sintering, is applied. Nevertheless as per the knowledge of the inventor , thereby the problem appears, that with the known geometric structures of the cutting elements- with strongly varying strengths of the blade in the cross section - a compressing always leads to an extemely inhomogenous material -dispersion (distribution), so that the cutting elements produced finally, exhibit many weakness-sites, for example in any zones, which considered cross-sectionally are more thinly extruded (formed). Now, as perceived by the inventors and as provided for as per the invention, the fastening-side is developed reinforced in a zone corresponding to the spinal(back) with approximately similar contour, thus the blades considered in cross section to the cutting edge exhibit approximately the same strength, whereby at a compressing of the hard metal , a formation of inhomogenities is avoided. In other words: Through a well balanced material dispersion (distribution) and a simultaneously exerting compressing-force , with reference to structure, it comes essentially to a fully homogenous formation of the blades in the entire zone . In -homogenities such as pores or undesired variations of thickness and the considerable delay caused through it at sintering can thereby be avoided. As a result of the reinforced development in the zone of the fastening-side, indeed more hard metal is to be provided for , nevertheless thereby it is also achieved, that the cutting element is repeatedly re-grindable on the front end, without it being so thin zonewise, that a danger of breaking would be present in a cutting- deployment. Since the cutting element should be possibly often re-grindable , it is appropriate that the blades exhibit the largest thickness or strength in the zone of the cutting edge , so that a depletion of material which proceeds along with grinding or sharpening turns out as less as possible. However a thickness or strength , as it is given in the zone of the cutting edge, considered transverse to the cutting edge , should not fall more than 40%, preferably not more than 25% , in order not to endanger a homogenous structure-formation with the compressing. With respect to this it is especially proven , that the spinal (back) from the cutting edge till the opposite side of the blade runs sloping(descending) and is developed (formed) with a plane zone as well as with a preferably concave curved zone adjacent to the level plane, more strongly sloping, which in a second plane, crosses over to a zone running approximately parallel to the first plane zone. Since the first plane zone , together with a side-surface , determines a cutting edge , which is made capable of functioning through sharpening or regular re-sharpening , a type of usage indicator given to the user: As long the concave zone remains atleast partially maintained with a re-sharpening , the cutting element exhibits a requiste strength, which makes it usable for a deployment for cutting. So long as also the concave region is ground through frequent re-sharpening and the first plane zone crosses over into the second plane zone or forms a plane with it, the user is signalled, that the cutting element at present exhibits a minimal thickness and is directly still usable for the duration of a suitable sharpness of the cutting edge. A further re-sharpening would weaken the cutting element in such a manner, that with further use of the cutting element a breakage of the same is possible with greater probability . With reference to a possibly long duration of usage of the cutting element it can also be provided for, that the rough cutter extends atleast over 75% of an outer periphery of the blade. Likewise, with reference to a possibly long duration of usage of the cutting element, it is provided, that the rough cutter is developed as curved. The cutting edges, on the contrary are preferably developed straight. Corresponding to the advantages of the invention which are described , it proves to be appropriate that the cutting element is formed one-piece from a compressed and sintered hard metal (cutting alloy). The further objective of the invention is achieved in the context of the aforesaid advantages explained thereby, that a cutting tool with a shaft and a cutting element is developed as explained, whereby the cutting element is soldered on the shaft or created integrally with it. Further characteristics, advantages and operations of the invention are yielded from the context of the description and the following execution- examples, with the help of which the invention is explained still further. It shows: Fig.l: A cutting element as per the invention in top-view; Fig.2 : A cutting element as per the invention in cross-section along the line II-II in Fig. 1; Fig.3: A cross-section (not true to measure) along the line III-III in Fig. 1; Fig.4: A cross-section (not true to measure) along the line IV-IV in Fig.l; Fig.5: A cutting tool as per the invention In Fig.l a cutting element as per the invention is portrayed more closely. The cutting element 1 shows a central, in cross section basically a round centre-portion 2, on which two two blades found at an angle of 180 deg.are integrally formed . The cutting element 1 consists entirely of hard metal (cutting alloy) and is created through compressing and sintering initial components in powdered form. The centre-portion 2 shows two ends, whereby centrally on an X axis on one end of the centre-portion 2 , a cutting point 3 and on an opposite end a nozzle 4 are positioned (Fig.2).On the Centre-portion 2 , two Blades 5 which are integrally formed as explained, which exhibit a so called Rough-Cutter 6 and a Cutting- Edge 7 on a Front-end 51, that is any side , which faces the Cutting- Tip 3. In deployment for cutting, the rough cutter 6 takes care, for example at a cutting/machining treatment of wood-raw materials , that the fibres(grains) are split. The zone(location) or cutting edge 7 brings about a chipping/machining decline (depreciation) . Accordingly, as is evident with the help of Fig.2, the rough cutter 6 is positioned higher than the cutting edge 7.The drill which is still protruding further or cutting tip 3 takes care, that the cutting tool 10 always remains centered. As is obvious from Fig. 1, the blades 5 in top view are cultivated (formed) with a straight cutting edge 7, on which in the outer zone encloses a rough cutter 6. The rough cutter 6 is positioned as close as possible on the cutting edge 7 and extends itself preferably atleast over 75% of an outer, curved periphery of a blade 5. This curved rough cutter 6 on its part crosses over into an edge(nosing) 71 or side-surface , which is like-wise developed as straight from the top view and facing the cutting edge 7. Between the edge (nosing) 71 and the cutting edge 7 , a spinal (back) 8 is developed, which slopes (falls off) from the cutting edge 7 till the facing edge (nosing) 71, as particularly evident with the help of Fig.3. Thereby the spinal (back) 8 is in split up in individual zones 81, 82 and 83 , to which on a rear-side or fastening- side 52 one of the contours of the spinal 8 approximately corresponds to the simulated ( patterned ) reinforcement-zone 9.Through this reinforcement- zone 9 is achieved that, the cutting element 1 considered in cross section shows solely negligible variations in its strength, on account of which it can be created, by means of compressing with basically a homogenous formation of the structure. The variations in strength which are obvious from Fig.3 are to be attributed thereto , that the cutting element 1 in the zone of a cutting edge 7 often should be re-grindable or re-sharpenable , on account of which, in this zone, in a way a certain excess material or a stronger development (formation) is provided for. Thereby the zones 81 and 83 , as portrayed in Fig.3, are developed running basically parallel to one another, whereas the one on the most strongly sloping( falling off) zone 82 partially exhibits a concave-curved structure. Thereby on the one hand is achieved , that atleast with lower duration of usage , only a small surface, namely basically the zone 81, is to be re-sharpened. On the other hand with repeated re-grinding, the concave zone 82 slowly gets diminished, till in the end the zone 81 is developed running parallel with the zone 83 or a plane is formed. This situation indicates to the user or the tool employer, that the cutting element 1 , considered in cross section, at present exhibits essentially the same strength and hence can be directly brought into use again once more , before a breakdown of the cutting element 1 in usage becomes very likely. Between the blades 5 and the nozzle 4 , free places 41 can be provided tor, on which a one-sided part 12 of a shaft 11 of a cutting tool 10 comes for installation , when the cutting element 1 should have to be connected with the shaft 11 through soldering ( Fig.5). Thereby a secure binding of the shaft 11 with the cutting element 1 is possible through soldering without having to impair the cutting element 1 in its stability. The production of a cutting element 1 as per the invention can ensue, in which a hard metal in powder form is put into a matrix (mould) and compressed with a compressing pressure of approx.l to 2 T/crm to a moulded part.Subsequently the moulded part so created is sintered for example in vacuum at approx.1200 deg.C to 1400 deg.C. After sintering and cooling off to surrounding temperature, the cutting edge 7 is sharpened and the cutting element 1 is ready to be put into action. WE CLAIM 1. Cutting element (1) for a cutting tool (10) such as a drill or rotary grinder/cutter with an approximately cylinder shaped centre-portion (2), on whose one end, a cutting tip (3) and on whose other end a nozzle (4) is situated , as well as with blades developed extending radially from the centre-portion (2) towards the exterior, preferably rotation-symmetric to the axis (X) of the centre-portion , which at any given time exhibit one of the cutting tip (3) facing front end (51) with an exterior -directed rough cutter( 6) and a cutting edge (7) running from centre-portion toward the exterior as well as a fastening-side (52) opposite the nozzle (4), whereby the blades (5) on the front end (51) are developed (formed) with a spinal(back)(8) adjacently sloping ( falling off) on the cutting edge (7), characterised thereby that the blades (5) are developed (formed) reinforced on the fastening-side (52) in a zone (9) corresponding to the spinal (8) with approximately similar contour. 2. Cutting element (1) as per Claim 1, characterised thereby , that the blades (5) exhibit largest thickness in the zone of the cutting edge (7). 3. Cutting element (1) as per Claim 2, characterised thereby, that the spinal(back) (8) runs sloping ( falling off) from the cutting edge (7) till the opposite side of the blade (5) and is developed (formed) with a plane zone (81) as well as with a preferably concave curved zone (82) more strongly sloping, adjacent to the plane zone (81), which crosses over into a zone (83) which in a second plane, runs approximately parallel to the first plane zone (81). 4. Cutting element (1) as per one of the Claims 1 to 3, characterised thereby, that the rough cutter (6) extends itself atleast over 75% of an external periphery of the blade (5). 5. Cutting element (1) as per one of the Claims 1 to 4, characterised thereby , that the rough cutter (6) is developed (formed) curved. 6. Cutting element (1) as per one of the Claims 1 to 5, characterised thereby, that the cutting edge (7) is developed (formed) straight. 7. Cutting element (1) as per one of the Claims 1 to 5, characterised thereby, that the cutting element (1) is built as one-piece from a compressed and sintered hard-metal (cutting alloy). 8. Cutting tool (10) with a shaft (11) and a cutting element (1) as per one of the Claims 1 to 7, which is created soldered on the shaft (11) or integral with ABSTRACT The invention concerns a cutting element (1) for a cutting tool (10) such as a drill or rotary cutter, with an approximately cylinder-shaped centre portion (2), on whose one end is situated a cutting edge (3) and on whose other end is a nozzle (4), as well with blades (5) which are developed extending radially from the centre-portion towards the outside, preferably rotation-symmetric to the axis (X) of the centre-portion , which at any given time exhibit front-end (51) facing one of the cutting edge (3) with a rough cutter (6) directed externally and a cutting edge (7) running from the centre-point outward as well as a fastening-side (52) opposite the nozzle (4), whereby the blades (5) are developed with spinal (back) (8) adjacently sloping on the cutting edge (7). As per the invention , it is provided that the blades (5) are developed (formed) reinforced on the fastening- side (52) in a zone (9) corresponding to one of the spinal (back)(8) with approximately similar contour.

Documents:

973-MUM-2008-ABSTRACT(10-10-2014).pdf

973-mum-2008-abstract.doc

973-mum-2008-abstract.pdf

973-MUM-2008-CHINA DOCUMENT(6-8-2012).pdf

973-MUM-2008-CLAIMS(AMENDED)-(10-10-2014).pdf

973-MUM-2008-CLAIMS(AMENDED)-(6-8-2012).pdf

973-MUM-2008-CLAIMS(MARKED COPY)-(6-8-2012).pdf

973-mum-2008-claims.doc

973-mum-2008-claims.pdf

973-MUM-2008-CORRESPONDENCE 20-6-2008.pdf

973-MUM-2008-CORRESPONDENCE(11-8-2009).pdf

973-MUM-2008-CORRESPONDENCE(15-6-2008).pdf

973-MUM-2008-CORRESPONDENCE(8-10-2008).pdf

973-mum-2008-correspondence-received.pdf

973-mum-2008-description (complete).pdf

973-MUM-2008-ENGLISH TRANSLATION(10-10-2014).pdf

973-MUM-2008-FORM 1(10-10-2014).pdf

973-MUM-2008-FORM 1(12-5-2008).pdf

973-MUM-2008-FORM 1(13-10-2014).pdf

973-MUM-2008-FORM 1(6-8-2012).pdf

973-MUM-2008-FORM 13(10-10-2014).pdf

973-MUM-2008-FORM 18 20-6-2008.pdf

973-MUM-2008-FORM 18(20-6-2008).pdf

973-MUM-2008-FORM 2(TITLE PAGE)-(10-10-2014).pdf

973-MUM-2008-FORM 2(TITLE PAGE)-(13-10-2014).pdf

973-MUM-2008-FORM 2(TITLE PAGE)-(6-5-2008).pdf

973-MUM-2008-FORM 2(TITLE PAGE)-(6-8-2012).pdf

973-MUM-2008-FORM 26(10-10-2014).pdf

973-MUM-2008-FORM 3(10-10-2014).pdf

973-MUM-2008-FORM 3(6-5-2008).pdf

973-MUM-2008-FORM 3(6-8-2012).pdf

973-MUM-2008-FORM 3(8-10-2008).pdf

973-mum-2008-form-1.pdf

973-mum-2008-form-2.doc

973-mum-2008-form-2.pdf

973-mum-2008-form-3.pdf

973-mum-2008-form-5.pdf

973-MUM-2008-FORMAL DRAWING(14-5-2008).pdf

973-MUM-2008-MARKED COPY(10-10-2014).pdf

973-MUM-2008-OTHER DOCUMENT(11-8-2009).pdf

973-MUM-2008-PETITION UNDER RULE 137(6-8-2012).pdf

973-MUM-2008-POWER OF ATTORNEY(13-5-2008).pdf

973-MUM-2008-REPLY TO EXAMINATION REPORT(6-8-2012).pdf

973-MUM-2008-REPLY TO HEARING(10-10-2014).pdf

973-MUM-2008-REPLY TO HEARING(13-10-2014).pdf

973-MUM-2008-SPECIFICATION(AMENDED)-(10-10-2014).pdf