CA1225235A - Rotary cutting tool and a holder for securing it in a tool-carrier - Google Patents
Rotary cutting tool and a holder for securing it in a tool-carrierInfo
- Publication number
- CA1225235A CA1225235A CA000434453A CA434453A CA1225235A CA 1225235 A CA1225235 A CA 1225235A CA 000434453 A CA000434453 A CA 000434453A CA 434453 A CA434453 A CA 434453A CA 1225235 A CA1225235 A CA 1225235A
- Authority
- CA
- Canada
- Prior art keywords
- cutting tool
- casing
- holder
- radial
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/10—Cutting tools with special provision for cooling
- B23B27/12—Cutting tools with special provision for cooling with a continuously-rotated circular cutting edge; Holders therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Milling Processes (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Turning (AREA)
- Sawing (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention describes a rotary cutting tool com-prising a bowl-shaped cutter secured cantileverly to the spindle of the cutting tool mounted on supports resisting radial and axial loads and disposed in the hole of the casing whose outer surface is essentially the surface of a body of revolution. The support resisting the axial load is accommodated in the hole of the casing between the supports resisting radial loads. The hole of the casing is eccentric to its outer surface, and the geometrical axes of the hole and the surface are disposed in one and the same plane, radial threaded holes for securing the casing of the cutting tool in the holder being made in the casing of the cutting tool at the points of disposition of the radial supports, at the side of the outer surface. The invention can be most successfully used for finish machining of paper embossing calender shafts at plants of the paper and pulp industry.
The rotary cutting tool and the holder for securing it in a tool-carrier make it possible to maximumly increase the rigidity and durability of the rotary cutting tool and the stability of the cutter, and are characterized, at the same time, by low metal consumption.
The invention describes a rotary cutting tool com-prising a bowl-shaped cutter secured cantileverly to the spindle of the cutting tool mounted on supports resisting radial and axial loads and disposed in the hole of the casing whose outer surface is essentially the surface of a body of revolution. The support resisting the axial load is accommodated in the hole of the casing between the supports resisting radial loads. The hole of the casing is eccentric to its outer surface, and the geometrical axes of the hole and the surface are disposed in one and the same plane, radial threaded holes for securing the casing of the cutting tool in the holder being made in the casing of the cutting tool at the points of disposition of the radial supports, at the side of the outer surface. The invention can be most successfully used for finish machining of paper embossing calender shafts at plants of the paper and pulp industry.
The rotary cutting tool and the holder for securing it in a tool-carrier make it possible to maximumly increase the rigidity and durability of the rotary cutting tool and the stability of the cutter, and are characterized, at the same time, by low metal consumption.
Description
~5~3~
Technics Field he present invention relates to the field of mschin-in by cutting end, more psrticulsrly 7 to rotary cutting tools and holders or securing them in tool-c~rrier.
he present invention con be Yost successfully used for finish machining of paper embossing calender shafts as ~lsnts of the paper and pulp industry.
Besides, the invention can be used it metal working for finish or semi-finish machining of petals and their alloys, as well as for machining non-metal articles.
Background Art Rotary cutting tool are presently used in industry for finish and semi-finish machining of work pieces. As compared to other types of cutting, rotary gutting which is characterized by rotation of the Quote tool end the workups aroulld their axes allows to prolong the service life of the cutter, to reduce the time of machining and to improve the finish.
Rotary cutting tools used for realization of the pro-cuss of rotary cutting posses such common features us em-lunate of a cutter which it cantileverly secured to the spindle of a cutting tool outed in a bearing unit which is instilled in the cutting tool casing. Short service life, low rigidity sod high metal consumption are chsrac-touristic of the conventional designs of rotary cutting tool 8 .
Conventional holders used for securing rotary cut-.
tying tools in a tool-carrier consist of a casing with ;
~2;~$~Z3S
holes ~ccomodating the cutting tool and fflsteners. he known holders are disadvantages it that during fasten in of the casing of the rotary cutting tool in the hole of the holder Sheehan the inner hole of the casing of the rota-I cutting tool, thaw serves as a set one for the radial supports is deformed under the action of the fastening force, which results in a shorter service life of the no-try cutting tool and its lower rigidity.
Know is a rotary cutting tool comprising a bowl--shaped cutter that is cantileverly secured to the spin-to of the cutting tool, mounted on supports resisting radial and axial loads and ~ccomodated in a hole of the casino whose outer surface is a surface of a body Or no-volition, the support resisting an axial loud being disk posed in the hole of the cutting tool casing between the supports resisting radial loads ("Progressive diagrams of rotary cutting of metals" by E.G.~onovaloY, Vowed-rink, AVOW Souse "Nikko i Tokyo" Publishing souse Minsky 1972, p. 20~, jig. 85b).
Also known is a holder for securing a rotary cutting tool in a tool carrier, whose casing is provided with 8 hole to ~cco~odate the cutting tool sod holes to house fafiteners, end is mode so that it partially embraces the cutting tool casing along an arc ("Progressive diagrams of rotary Cutting of teals by ~.G.Konovalov, Yessed-rink, A.V.Sous. "awoke i Tunics" Publishing souse, Minsky 1972, p. 189, jig. 76).
ifs or the wake of simplicity hereinafter in the spew suffocation the terms supports resisting radial lords"
anon support resisting sun axial load will be substitu-ted with the terms radial supports" and "an vial sup-port', respectively.
During operation of the conventional rotary cut-tying tool the wall of its casing resist with its limited portion a radial load constant ion its direction.
The local loading Durham of the cutting tool C8S-in it the point of installation of the radial support is essentially parasols disposed symmetrically restive to the line of action Or the resultant radial load onto the support. Hence, the load onto the cutting tool Sheehan is maximal in the direction of the line ox action of the resultant radial force and monotonously decreases in the direction opposite to the live of action of the force.
The known designs Or rotary cutting tools do not account for the character (law) of variation of the raid at load acting upon the cutting tool casing. The thickness of the walls of the cutting tool casing is the sue both in the direction of the line of action of the radial force upon the radial supports and in the opposite direct -lion.
Hereford, in toe known design of the rotary cutting tool the required reedit and service life are provided due to thickening the whole wall of the casing of the spindle unit, which results in its greater over-all dime-sons and metal consumption A decrease in the thickness .
I
of the Hall of the casing of such a cutting tool results in a lower rigidity of the cutting tool and its shorter service fife, as well as a lower durability of the cutter.
Removal from the cutting tool casino Or the support resisting the axial load presents lsbour-consuming technological operation await requires preliminary redo-vet of the support resisting the radial load, which is disposed closest to the cutter. In the known design ox the rotary cutting tool the outer diameter of the support resisting the axial loud does not exceed the inner dime-ton of the set hole of the cutting tool casing at the point of installation of the radial support of the cutting tool, which is disposed closest to the cutter, us other-wise the assembly process would be impossible.
The known design Or the holder securing a rotary cutting tool in 8 talker' I the ~achine-tool is dis~d~snta~eous in that when tightening (deforming) the holder casino with fasteners Lyon on arc, the outer sun-face of the cutting tool casino and, consequ~ntlyl its inner surface in which the bearing unit of the cutting tool is mounted sure deformed. The value of the ellipseness Or the inner surface of the hole of the cutting tool casino, arising in this case, by 2-5 times exceeds the ellipseness allowed or manufacture Or the seat Cole of the cutting Jo tool casing, accommodating the radish supports This no-suits in lower rigidity of the rotary cutting tool end its shorter service life, and brims down the stability -I
Sue Or the cutter in the process of machining. A decrease in the force Or tightening the holder casing with fasteners along an arc reduces the reliability of securing ox the cutting tool casing in the holder, which brings about vibration in the course of machining. The glue of the ellipseness appearing in the seat hole of the Clayton tool casino can be decreased by increasing the thickness of the wall of the cutting tool casing, which results in treater metal consumption of both the cutting tool and the holder securing it in tool carrier, as well as in a hither cost of its manufacture. In the majority of cases increased dimensions of the holder wake it impost sidle to use the latter in standard metal-worXin~ equip-Monet Brief Description of the Invention The yin object of the present invention it to imp-rove a rotary cutting tool and a holder securing it in a tool-c~rrier, which would allow for a maximum increase in the rigidity of the rotary cutting wool.
Arthur object Or the present invention is to provide such a cutting tool add a holder whose Swiss life would be longer thin that of the known cutting tool and holder Jo of the same type.
Still another object of the present invention is to provide the above rotary cutting tool and holder for so-curing it in a tool-carrier, which as compared to semi-far cutting tools and holders of the some type, would be less petal counseling.
.'. ' ' ' ' ' "
~2~5~35 The above-mentioned and other objects are acco~pli~
shed by jeans of a rotary cutting tool comprising a rota-rye cutting tool and a holder for securing it in a tool--carrier of the machine-tool, which in their co~binstion would allow to maximal increase the rigidity- and Mervin go life of the rotary cutting tool, to rise tabulate Or the cutter and were characterized, sty the sums tire, by low petal consumption.
he above task is accomplished by Miss of a rotary cutting tool comprising 8 casing with a loaned Sirius which is essentially the surface of body Or revolution, sod with a hole accommodating supports that resist radial lo-ads, have another support disposed there between and resist-in an exist load, and carry spindle with a cflntile~erly it-Ted bowl-shaped cutter, in which, according to the inanity-on, the hole of the cussing is srran~ed eccentrically rely-live to its outer surface and their geometrical axes are disposed in one end thy save plane which is the plane of symmetry of the cutting tool, and radial threaded holes used for securing the cutting tool casing in the holder are made in the casino of the cutting tool in the direct lion opposite to the direction Or displacement of the eccentricity, at the points of installation of the sup-ports resisting radial loans, and at the side of the outer surface Or the casino.
Due to the f act that the hole of tyke cutting tool casino is arranged eccentrically relative to the outer . - 8 .
US
surface of the casing the wall of the Cowan con hove a smaller thickness in the direction ox displacement Or the eccentricity, the thickness of the wall griddle Monet-nuzzle increasing according to the parabolic law, and it reaches its maximum thickness in the direction opposite to the direction of displacement ox the eccentricity -This design of the cutting wool casing accounts for the parabolic character of variations of the radial loud act in in the course of machining upon the wall of the cutting tool casing. whereby, in the direction of the lint of act lion of the greatest radial force the thickness Or the wall of the cutting tool cnsin~ is the greatest, whereas at the points of the casing where the value of the acting radial force is smaller than its maximum value it is the smallest. As the character of changes in the thickness the wall of the cutting tool casing corresponds to the character of variations of the radial load coin there-upon, it is possible to rise by 1.5-3 times such quell Tut indices of the rotary cutting tool as its rigidity and durability, preserving, it the same time, its low petal consumption.
Employment of the radial threshed holes prevents appearance of the bending moment in the fatteners end, conseguentl~, does not allow vibrations to appear in the Joint of the cutting tool and the holder, which contribu-toes to stability of the cutter in the course of machining so the plsnea of suction of the radial force phasing _ g _
Technics Field he present invention relates to the field of mschin-in by cutting end, more psrticulsrly 7 to rotary cutting tools and holders or securing them in tool-c~rrier.
he present invention con be Yost successfully used for finish machining of paper embossing calender shafts as ~lsnts of the paper and pulp industry.
Besides, the invention can be used it metal working for finish or semi-finish machining of petals and their alloys, as well as for machining non-metal articles.
Background Art Rotary cutting tool are presently used in industry for finish and semi-finish machining of work pieces. As compared to other types of cutting, rotary gutting which is characterized by rotation of the Quote tool end the workups aroulld their axes allows to prolong the service life of the cutter, to reduce the time of machining and to improve the finish.
Rotary cutting tools used for realization of the pro-cuss of rotary cutting posses such common features us em-lunate of a cutter which it cantileverly secured to the spindle of a cutting tool outed in a bearing unit which is instilled in the cutting tool casing. Short service life, low rigidity sod high metal consumption are chsrac-touristic of the conventional designs of rotary cutting tool 8 .
Conventional holders used for securing rotary cut-.
tying tools in a tool-carrier consist of a casing with ;
~2;~$~Z3S
holes ~ccomodating the cutting tool and fflsteners. he known holders are disadvantages it that during fasten in of the casing of the rotary cutting tool in the hole of the holder Sheehan the inner hole of the casing of the rota-I cutting tool, thaw serves as a set one for the radial supports is deformed under the action of the fastening force, which results in a shorter service life of the no-try cutting tool and its lower rigidity.
Know is a rotary cutting tool comprising a bowl--shaped cutter that is cantileverly secured to the spin-to of the cutting tool, mounted on supports resisting radial and axial loads and ~ccomodated in a hole of the casino whose outer surface is a surface of a body Or no-volition, the support resisting an axial loud being disk posed in the hole of the cutting tool casing between the supports resisting radial loads ("Progressive diagrams of rotary cutting of metals" by E.G.~onovaloY, Vowed-rink, AVOW Souse "Nikko i Tokyo" Publishing souse Minsky 1972, p. 20~, jig. 85b).
Also known is a holder for securing a rotary cutting tool in a tool carrier, whose casing is provided with 8 hole to ~cco~odate the cutting tool sod holes to house fafiteners, end is mode so that it partially embraces the cutting tool casing along an arc ("Progressive diagrams of rotary Cutting of teals by ~.G.Konovalov, Yessed-rink, A.V.Sous. "awoke i Tunics" Publishing souse, Minsky 1972, p. 189, jig. 76).
ifs or the wake of simplicity hereinafter in the spew suffocation the terms supports resisting radial lords"
anon support resisting sun axial load will be substitu-ted with the terms radial supports" and "an vial sup-port', respectively.
During operation of the conventional rotary cut-tying tool the wall of its casing resist with its limited portion a radial load constant ion its direction.
The local loading Durham of the cutting tool C8S-in it the point of installation of the radial support is essentially parasols disposed symmetrically restive to the line of action Or the resultant radial load onto the support. Hence, the load onto the cutting tool Sheehan is maximal in the direction of the line ox action of the resultant radial force and monotonously decreases in the direction opposite to the live of action of the force.
The known designs Or rotary cutting tools do not account for the character (law) of variation of the raid at load acting upon the cutting tool casing. The thickness of the walls of the cutting tool casing is the sue both in the direction of the line of action of the radial force upon the radial supports and in the opposite direct -lion.
Hereford, in toe known design of the rotary cutting tool the required reedit and service life are provided due to thickening the whole wall of the casing of the spindle unit, which results in its greater over-all dime-sons and metal consumption A decrease in the thickness .
I
of the Hall of the casing of such a cutting tool results in a lower rigidity of the cutting tool and its shorter service fife, as well as a lower durability of the cutter.
Removal from the cutting tool casino Or the support resisting the axial load presents lsbour-consuming technological operation await requires preliminary redo-vet of the support resisting the radial load, which is disposed closest to the cutter. In the known design ox the rotary cutting tool the outer diameter of the support resisting the axial loud does not exceed the inner dime-ton of the set hole of the cutting tool casing at the point of installation of the radial support of the cutting tool, which is disposed closest to the cutter, us other-wise the assembly process would be impossible.
The known design Or the holder securing a rotary cutting tool in 8 talker' I the ~achine-tool is dis~d~snta~eous in that when tightening (deforming) the holder casino with fasteners Lyon on arc, the outer sun-face of the cutting tool casino and, consequ~ntlyl its inner surface in which the bearing unit of the cutting tool is mounted sure deformed. The value of the ellipseness Or the inner surface of the hole of the cutting tool casino, arising in this case, by 2-5 times exceeds the ellipseness allowed or manufacture Or the seat Cole of the cutting Jo tool casing, accommodating the radish supports This no-suits in lower rigidity of the rotary cutting tool end its shorter service life, and brims down the stability -I
Sue Or the cutter in the process of machining. A decrease in the force Or tightening the holder casing with fasteners along an arc reduces the reliability of securing ox the cutting tool casing in the holder, which brings about vibration in the course of machining. The glue of the ellipseness appearing in the seat hole of the Clayton tool casino can be decreased by increasing the thickness of the wall of the cutting tool casing, which results in treater metal consumption of both the cutting tool and the holder securing it in tool carrier, as well as in a hither cost of its manufacture. In the majority of cases increased dimensions of the holder wake it impost sidle to use the latter in standard metal-worXin~ equip-Monet Brief Description of the Invention The yin object of the present invention it to imp-rove a rotary cutting tool and a holder securing it in a tool-c~rrier, which would allow for a maximum increase in the rigidity of the rotary cutting wool.
Arthur object Or the present invention is to provide such a cutting tool add a holder whose Swiss life would be longer thin that of the known cutting tool and holder Jo of the same type.
Still another object of the present invention is to provide the above rotary cutting tool and holder for so-curing it in a tool-carrier, which as compared to semi-far cutting tools and holders of the some type, would be less petal counseling.
.'. ' ' ' ' ' "
~2~5~35 The above-mentioned and other objects are acco~pli~
shed by jeans of a rotary cutting tool comprising a rota-rye cutting tool and a holder for securing it in a tool--carrier of the machine-tool, which in their co~binstion would allow to maximal increase the rigidity- and Mervin go life of the rotary cutting tool, to rise tabulate Or the cutter and were characterized, sty the sums tire, by low petal consumption.
he above task is accomplished by Miss of a rotary cutting tool comprising 8 casing with a loaned Sirius which is essentially the surface of body Or revolution, sod with a hole accommodating supports that resist radial lo-ads, have another support disposed there between and resist-in an exist load, and carry spindle with a cflntile~erly it-Ted bowl-shaped cutter, in which, according to the inanity-on, the hole of the cussing is srran~ed eccentrically rely-live to its outer surface and their geometrical axes are disposed in one end thy save plane which is the plane of symmetry of the cutting tool, and radial threaded holes used for securing the cutting tool casing in the holder are made in the casino of the cutting tool in the direct lion opposite to the direction Or displacement of the eccentricity, at the points of installation of the sup-ports resisting radial loans, and at the side of the outer surface Or the casino.
Due to the f act that the hole of tyke cutting tool casino is arranged eccentrically relative to the outer . - 8 .
US
surface of the casing the wall of the Cowan con hove a smaller thickness in the direction ox displacement Or the eccentricity, the thickness of the wall griddle Monet-nuzzle increasing according to the parabolic law, and it reaches its maximum thickness in the direction opposite to the direction of displacement ox the eccentricity -This design of the cutting wool casing accounts for the parabolic character of variations of the radial loud act in in the course of machining upon the wall of the cutting tool casing. whereby, in the direction of the lint of act lion of the greatest radial force the thickness Or the wall of the cutting tool cnsin~ is the greatest, whereas at the points of the casing where the value of the acting radial force is smaller than its maximum value it is the smallest. As the character of changes in the thickness the wall of the cutting tool casing corresponds to the character of variations of the radial load coin there-upon, it is possible to rise by 1.5-3 times such quell Tut indices of the rotary cutting tool as its rigidity and durability, preserving, it the same time, its low petal consumption.
Employment of the radial threshed holes prevents appearance of the bending moment in the fatteners end, conseguentl~, does not allow vibrations to appear in the Joint of the cutting tool and the holder, which contribu-toes to stability of the cutter in the course of machining so the plsnea of suction of the radial force phasing _ g _
2 S
through the radial supports end the points of fastening the cutting tool casing (the r~stening radial threaded holes) in the holder will in this case coincide.
In order to reduce metal consumption of the cutting tool the amount of labor required for its manufacture, it is guile expedient to aye the cutting tool casing ox a stepped-c71indrical shape, whereby the step of the cut-tin tool casino hiving the outer surface of a wrier duster should preferably be disposed in the direct I-Senate to the cutter US this portion ox the CUttiIlg tool casino contains the radial support of the cutting tool, which is closest to the cutter and determines durability ox the latter because in the course of machining it happens to be the most loaded one. the other portion of the cutting tool casing haying the outer surface ox a staller diameter contains toe radial support resisting a radial force which is by I tires (depending on the design features of the cutter) smaller thin the one act-in upon the radial support disposed next to the cutter.
In view of the fact that this portion of the cutting tool casino does not determine durability of the rotary cut-tying tool and is least loaded in the course of machining the outer diameter of the casing at the point Or install-lion of the support can be substantially decreased as it does no worsen the operating characteristics of the rota-rye cutting tool but reduces its metal consumption.
In order to provide for the process of installation o the support resisting the axial load into the cutting issue tool casing end it removal from the cutting tool casin~during disassembly, it is guile feasible to male a slot opposite the support, from the side of the outer surface of the casing end perpendicularly to the plane of Semite-I ox the cutting tool, it which case it will become no more necessary to preliminarily remove the support.re~isting the radial load when extracting the support resisting the axial load As a result, it becomes possible to place into the cutting tool casing support resisting the axial load of a greater voter diameter than the inner diameter of the seat hole of the cutting tool coin at the point of installation of the radial support closest to the cut-tern An increased outer diameter of the support resiatin~
the axial load increases the diameter on which its solids of revolution sure disposed, Thor raisin resistance of the cutting tool spindle to vibration and increasing rigid duty and durability of the rotary cutting tool. We hove found that on increase in the diameter of the support no-sitting the axial loud by 10~ provide the some increase in the rigidity and durability of the rotary cutting tool, which con be attained by increasing by 25-40% the distance between the supports resisting radial Lindsey However, a greater distance between the radial supports would increase the dimensions of the cutting tool, its metal consumption and the amount of labor required for its manufacture.
The above and other objects are accomplished by that , , 5~3~i~
The above task is accomplished by that in holder for securing a rotary cutting tool in tool-carrier,its casing has a hole to acco~odate the casing of the cutting tool and holes to house fasteners and is made 60 that it partially embraces along an sac the casing Go the cutting tool, end, in sccord~nce with the invention, it hs3 end port Sheehan adjoining along an arc the outer surface of the cut-tin tool cawing and a central portion disposed thereabout-wren end with some gyp from said surface, the casing Or the holder being made so that the ankle at which it embraces the quote tool casing is in the range of 90 to 180 and the holes housing fasteners being arranged coccal rein-live to the threaded holes of the cutting tool casing.
The end portions adjoining along an arc the surface of the cutting tool casing provide for their tight adherence to the casing Or the cutting tool us the radius of the arcs of the end portions corresponds to the radius ox the outer surface of the cutting tool casing. The central port lion disposed between the end portions and with some gap prom the surface of the cutting tool shying provides for uniform distribution of the load over the end Portia owns of the holder, caused by the radial force ox cutting so in the plane of its action (radial force) there is no contact between the outer surface of the cutting tool casing sod the surface of the hole of the holder casing, To supplier mounting of the casing of the rotary cutting tool in the holder the greatest single at which the hot-don casino embraces the casing of the cutting tool should ' be made us to 1~0, since other-wise, in order to con-neat the casing of the cutting tool to the surface of the hole of the holder cgsin~, it is necessary to Rowley-~inaril~ ensure their strict coccal, which hampers the assumably and increases metal consumption of the hot don. It is not recommended to wake the angle ox embracing staller than 90 as otherwise it will cause vibrations of the cutting tool casino in the course of machining due to increased specific pressures on end end portions of the holder.
It it expedient to wake the holes housing fasteners and made in the holder casing coaxial to the threaded ho-lies in the casing of the cutting tool, as otherwise it is extremely difficult to secure the cutting tool casing in the casing of the holler. The casino of the cutting tool is secured in the hole of the holder casing with the aid of such widely used means as screws, pins, etc. which are inserted into the holes housing fasteners and pro-voided in the casing ox the holder end are screwed into the threaded holes from the side of the outer surface of the casino of toe cutting Tao thereby pressing the outer surface of the cutting tool casino anisette toe end portions of the holder.
The solder provides for revile securing of the cussing Or the rotary cutting tool without any deformation of its inner surface of the hole which is a seat one for bearing support. This takes place due to the fact that - tightening forces of the fasteners do Dot cause an deformation in the outer surface of the casing of the cut-~;~5;~35 tying tool but only contribute to its tight (strong) ache-fence to the end percher;
- tightening forces of the fasteners do not cause any deformation in the casing of the holder.
Brief Description of the Invention The following detailed description of a specific em-oddment of the present invention is given with reference to the accompanying drawings, in which:
Fix. 1 show a general view ox a rotary cutting tool with a hole in its casing made eccentrically relative to its outer surface according to the invention, a long-tudina~ section;
Fig. 2 is if view along arrow A in Fig. 1;
Fig. 3 is a section along line III-III in Fig. 2, turned through 90;
Fix. 4 is a section along line IV-IV in Fig. 2, turned through 90;
Fig. 5 shows a general view of a rotary cutting tool, with the outer surface of its casino being of a stepped-cylindrical shape, a variant of embodiment according to .
the invention, a longitudin~1 section;
. Foe 6 is a section along line VOW in it 5;
I 7 shows a general view of a holder for securing`
a rotary cutting tool in a tool-carrier, according to the the invention, a cross-section;
Fig. 8 is a view along arrow B it . 7, turned through 90;
Fig. 9 is a section along line IX-IX in jig. I, ~25~3S
turned through 90;
Fig. 10 is if section along line X-X in Yip. 8, turned through 90.
Detailed Description of the Invention A rightly cutting tool shown in Fig. 1 comprises if casing 1 acco~odating a spindle 2 mounted on supports 3,4 resisting radial loads and a support 5 resisting an axial load, the support 5 being disposed between the radish supports 3 and 4. Cantileverly secured to the spindle Z
us a cutter 6. Axial displacement of the spindle 2 it it-sited by a nut 7 which rests on an inner King of the ray dial support I. Axial displsceme~t of the radial support 4 is limited by a retaining rink 8. The cutter 6 is so-cured to the spindle 2 by means of a nut 9. A Neal 10 and a cap 11 protect from impurities a bearing unit coup-rising the radial supports 3 rod 4 and the support no-siesta an exist load. An outer surface 12 of the casino 1 his the shape of a body of revolution with a eater-eel axis 13.
A hole 14 in -the casing 1 has a geometrical Axis I
and is displaced in the direction along an arrow 16 rota-live to the outer surface 12 of the casing 1 of the cut-tying tool over the value of an eccentricity "en.
Rsdisl threshed holes 17 phase I, 4),-18, 19 are made in the cutting tool casing 1 in the direction oppo-site to the direction along the sorrow 16 of displacement of the eccentricity "e" of the hole 14 of the casing 1 12;~SZ3~
at the points of disposition of the radial supports 3 (jig. 2) and 4 and at the side of the outer surface 12.
The geometrical axes 13 and 15 sure disposed in plane 20 which is the plane of Sumter of toe cutting tool.
At the point of installation of the radish support 3 (Fig. 3) the cutting tool casing 1 has a thickness vying along its perimeter. In the direction of display cement ox the eccentricity "e", indicated by the arrow 16, the thickness of the wall ox tune cutting tool casing 1 decreases monotonously to reach its smallest value Spin which is disposed in the plane 20 Or symmetry of the cut-twig tool. In the direction opposite to the direction indicated by the arrow 16 the thickness of the wall Or the casing 1 ~nr.otonously increases and reaches its greatest valve Smocks which is also disposed in the plane 20 of symmetry of the cutting tool.
At the point of installation of the radial support 4 (Fix. 4) the casing 1 of the quoter tool also has thickness varying along its perimeter. the values of the greatest Sax sod smallest Spin thicknesses of the wall of the casino 1 sure disposed diametrically in the plane 20 of symmetry of the cutting tool The number of fasteners disposed in the casing 1 Or the cutting tool con be increased and, for instance, at the point of disposition of the radial support 4 it con be recommended that during mschi~ing of intermittent surfaces two radial threaded holes disposed at both sides of the plane 20 of symmetry of the cutting tool be jade.
.
. ' . '. ' . ' ' .
A rotary cutting tool shown in jig. 5 comprisescasin6 21 having a spindle I mounted on radial support 23t 24 and a support 25 resisting an axial load and en-range between the radial supports 23 and 24. A cutter 26 is cantileverly secured by nut 27 on the spindle 22 - whose axial displacement is limited by 8 nut 28 resting upon an inner ring of the radial support 24, Axing disk placement of the radial support 24 is limited by a retain-in rink 29. A seal 30 and a cap 31 protect the bearing unit from impurities. The outer surface of the casino 21 of the cutting tool is jade of a stepped-cylindrical she-pew whereby a step 32 of the cozily 21 having the outer surface 34 Or a greater diameter is disposed in the dip feat vicinity to the cutter 26. A step 33 of the ceding 21 having the outer surface 35 ox a smaller diameter is the remotest from the cutter 26. A hole 36 of the cutting tool chosen 21 with a geometrical axis 37 is displaced relative to the outer surfaces 34 an I of the casing 21 in the direction indicated by an arrow 38. Because of the different diameters of the steps 32 and 33 of the casing 21 the values of displacement of the eccentricity are different too. The geometrical axis 37 Or the hole 36 is displaced relative to the geometrical axis 39 Or the outer surface 34 of the casing 21 of the cutting tool over a value en. Tlle~eolaetrical axis 37 Or the hole 36 is displaced relative to the geometrical axis 40 of the surface 35 Or the casing 21 over a value en, en > en in any case. The geometrical sues 37, 39 end 40 are disposed ~ZZ~3S
in one plane 41 (Fig. 6) which is the plane of symmetry of the cutting tool, otherwise the labor consumption of manufacture and production C05t of the writer cutting tool increase as the casing 21 becomes difficult to pa-nectar. There is possible a case when the value of displacement Or the eccentricity en I- i. 8. the geomet-rival axis 37 of the hole 36 of the cawing 21 coincides with the geometrical axis 39 of the outer surfs 35, when the metal consumption of the rotary cutting tool decreases.
The stew 32 of the cutting tool casino 21 accomoda-yes the radial support 23 which is the closest to the cutter and which determines the rigidity and durability of the rotary cutting tool as in the course of machining it resists the rusticity loan which by several tires exceeds the loud acting upon the Ludlow support 24. Therefore to Roy reedit of the support 23, it is necessary to increase the thickness of the ~11 Or the coin at the point Or il~stallntion of the radial support I for which purpose the step 32 Or the chosen 21 having the outer Sirius 34 of a greeter diameter should be disposed in the direct vicinity to the cutter 26. The radial support 24 which is the remotest from the cutter 26 does not determine rigidity and durability of the rotary cutting tool us in the course of machining it is loaded with an insignificant radial force, for which reason, in order to decrease metal consumption of the rotary cutting tool, this support 24 should be disposed in the step 33 of the cutting tool - ' .
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casing 21 having the outer surface 35 of a smaller dip-Peter. A slot 42 it 5, 6) necessary for assembly end disassembly of the support 25 18 maze in the cutting tool casing 1 opposite the support 25 resisting en axial load and perpendicularly to iota plane 41 of ~ymmetr~. Provision of the slot 42 in the cutting tool casing 21 makes it pox-sidle to mount the support 25 resisting on axial load of a wrester outer diameter than the outer diameter of the radial support 23 which is the closest to the cutter 260 the increased outer diameter Or the upper 25 inquiry-sues the diameter of the traveling path ox the solids of revolution, the rigidity Or mQUntin~ of the spindle 22 in the support 25 and, consequently, the reedit And durability of the rotary cutting tool as A whole. The slot 42 used for preventing dust from getting into the bearing unit is covered with a casing (not show in the drawings).
It is recommended to make the height h (Fig. 5) and the width C (Fig. 6) of the slot 42 by I mm greater than the height and the outer diameter of thy support 25 nests-tin an exist load.
It is recommended to use thy rotary cutting tool whose casing is provided with s slot for machining intermittent surfaces and in other cases in which impact loads are in-hornet. It is expedient to wake the slot at the side of the staller thickness of the wall of the cutting tool casino as this decreases the amount of labor required for its manufacture.
'I
3LZZS~35 it. 7 shows a holder for securing A rotary Quoted tool in tool-carrier, comprising a casing 43 go 8) which has a hole to accommodate a casino 45 (Fig. 9) of the cutting tori lid holes 46 I 8), 47, 48 for housing Issteners 49 (Fix. 9), 50, 51 (Fix. 10). The casino I of the holder is made so that it partially umbra-cues the casino 45 of the rotary cutting tool along arcs 52, 53. the casing 43 ox the holder has end`portio~s 54 (Fits. 7, 8) and 55 which adjoin the outer surface of the casino 45 of the cutting tool along arcs I end 53, Disco-sod between the end portions 54 and 55 is a central port lion 56 having central angle Jo an arranged with a zap from the outer surface 57 of the casino 45 Or the rotary cutting tool. the casing 43 ox the holder is made so that the angle at which it embraces the casing 45 of the cutting tool is in the range to 90 to 180. the holes 46, 47, 48 housing the fasteners 49,50,51 of the casing 43 of the holder are made coaxial to threaded holes 58, 59, 60 of the casino 45 of the cutting tool. The holder has a shank 61 ho which it is mounted and secured in the tool--carrier of the m~chine-tool.
he hole 44 of the casing 43 of the holder cores-ponds to the outer surface 57 Or the casing 45 Or the cutting tool, thereby providing tight adherence of the end portions I and 55 Or the Collogue 43 of the holder to the outer surface 57 of the casino 45 of the rotary cutting tool along the arcs 52 and 53. Provision Or the end pro lion 54 and I disposed at the both sides of the , Sue central portion 56 ensures uniform force of fasteniIl~ of the cussing 45 of the cutting tool to the end portions 54, 55 and in the course of aching mazes it possible to distribute symmetricfllly the load caused by the cutting force over the casing 43 of the holder, which contributes :.
to its rigidly Since the threaded holes I 59, 60 of .
the casino 45 of the retrieve cutting tool ore jade coaxial to the holes 46, 47, 48 housing the fasteners 49, I, 51, it is not difficult to secure the casing 45 of the rotary cutting tool in the hole 44 of the casing 43 of the holder by way of squire fasteners, for example, the squire 49, 50, 51 into the threaded holes 58, 59, 60 of the casing 45 ox the cutting tool.
It is recommended to choose the angle it which the casino 43 of the holder embraces the casing 45 of the rotary cutting tool depending on the condition of machining. For example, for finish machining when the radial cutting force does not exceed 10-15 kg, the Nile 90-120, for symphonies machining, when the radial cutting force does Slot exceed 35-40 I 120 - 150, in all other cases 150 ' 180 I:
he Nile which determines the position of the central portion 56 ~eparfltin6 the end portion end 55 of the casino 43 of the holder is recommended to be select ted depending on the Nile of embracing or example, with - 90 -120, 30 35 with = 90-150, = 35-40 and with 150 180, 40-90.
If the angle is chosen treater thin thy recommended assess one, this will decrease the length of' the arc of contact Or the end portions 54 and 55 with the outer surface 57 of the casino 45 of the rotary cutting tool and, kinesic-entoil ill decrease the strength of the joint ox the coin 45 of the rotary cutting tool with the casing I of the holder. If the angle is chosen staller than the recomb wended one, the plane in which the resultant of the cut-tying force acts will pass through one of the end portions 54 or 55 of the casino 43 of the holler, which will result in vibrations during Canaan.
In the case when the outer surface ox the cutting -tool casing is of a stepped-cylindrical ape, the surface of the hole of toe holder chosen should be also jade of a step~ed-cylindricsl shape corresponding to the outer sun-face of the casing ox the rotary cutting tool.
During assembly of the casing 45 of the cutting tool with the chosen 43 Or the holder the fasteners 49, 50, 51 tightly press the outer surface 57 Or the cutting tool Reincite the end portions 54 and 55 of the casino I ox the holder The tightening force Our the rssteners 49, 50, I
does not deform the casing 45 of the rotary cutting tool;
as the tightening force of the fasteners 49, 50, 51 in creases the tightness (strength) of adherence of the cay .
sing 45 of the cutting tool to the end portions 54 and So along the arcs 52 and 53 increases too, the shape of slid end portions 54 and 55 corresponding along the whole area of contact to the shape of the outer surface 57 of the casing 45 of the cutting tool The tightening force of .
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~L2;~:5~3S
the fasneters 49, 50, 51 does jot deform the casing 43 of the holder either, which ensures reliable end durable operation of the rotary cutting tool, and increases its rigidity, preserYillg, at the same time, its small metal consumption.
Principle of Operation A rotary cutting tool shown in issue. 6 and holder for securing it it a tool-c~rrier, shown in its 7-10, jade according to the invention, operate so follows. Prior to machining, a rotary cutting tool is secured in the hole 44 of the assign 43 of the holder, for which purpose the casino 45 of the rotary cutting tool is placed into the hole 44 of the casirlg 43 of the holder in such a wanner tout the geometIicDl axes of the threaded holes 58, 59,60 mode in the easing 45 of the rotary cutting tool coincide with the geometrical axes of the holes 46 I 48 housing the fasteners of the casing 43 of the holder. ThereupoIl, the fasteners 49, 50, 51 are screwed into the threaded holes 58, 59, 60 of the casing of the cutting tool end are tightened to press the casino 45 of the rotary cutting tool against the end portions 54 end 55 of the casing 43 of the holder. As the arcs 52 end 53 forming the end port lions 54 end 55 by their shape correspond to the shape of the outer surface 57 of the casing 45 of the rotary cutting tool. the tightening force provides for tight erroneous of the surface 57 of the casing 45 of the cutting tool to the end portions 54 and 55. As the force of tightening ~2i2523~;i the fasteners 49, 50, 51 increases, the adherence of the outer surface 57 of the casing I of the rotary cutting tools to the arcs 52 and 53 of the end portions 54 and 55 becomes tighter; whereby the force Of tightening the f~sterlers 49, 50~ 51 does not deform the casino; *3 of the holder, wish, in its turn prevents deformation ox the outer surface 57 of the casing 45 of the rotary Quoted; tool and, kinesic-entoil defor~atioII of its hole in which the radial supports are mounted. Besides, this provides for the optimal coy lions of the bearing; unit of the rotary cutting tool during operation.
T.'lith the rotary cutting tool secured in the casino 43 of the holder, the latter in inserted with its shank 61 into the taol-carrier of the machine tool and it secured therein.
The rotary cutting tool shoYJn in Fix. 1 functions as follows. As a result of rotation of the workups and the longitudinal feed of the cutting tool the cutter 6 rotates together with the swindle 2 of t-he awaken tool in the boa-rink unit around the geometrical axis 15. By means of the outer ring of the radial support the radial load PRY
(Fig. 1) is resisted by a limited portion of the seat sun-face of the hole 14 of the Quietly tool casino; 1 in the direction of the live of action of the radial force. The local load dozier of the casino, 1 of the rotary cutting tool at the point of installation of the ray i at Cypriot 3 nigh is most loaded tooth a radial load is essentially a -- 24 _ ~zs~s parabola which is disposed symmetrically relative to the line of action of the radial loan. Since the shape of the outer surface I of the casing 1 of the rotary cutting tool relative to the hole I ox the casing 1 is also a parabolic curve disposed symmetrically relative to the plane of symmetry 20 of the cutting tool, the greatest Sax (Fig. 3) value of the thesis ox the wall of the rotary cutting tool casino 1 corresponds to the greatest value of the radial load acting in the plane of symmetry 20 of the cutting tool. A smaller value of the thesis of the wall of the cutting tool casing corresponds to a smaller value of the radial load, and at the points of the casino 1 where there is no radial load the thic'L~ess of the wall of the casing 1 is the smallest Spin (I ), thy S no-suiting in higher rigidity and durability of the rotary cutting tool, preserving, at the same time, its Dow metal consumption. It is expedient to use the rotary cutting wool shown in jig. 1 in the cases when the radial load acting on the radial support 4 which is the remotest from the cutter 6 is by 3-5 times smaller thaw the radial load acting upon the radial support I. .
In the cases ennui it is necessary to decrease the me-tat consumption of the rotary cutting too it is expedient to use the design of the cutting tool, in accordance with which its casing is made of a stepped-cylindrical shape, the portion of the cutting tool Casey Hun the outer surface of a greater diameter being disposed in the dip feat vicinity of the cutter.
- 25 - :
.
Sue In the cases when the process of machining is kirk-terraced by impact loads it is most expedient to Use the design of the rotary cutting tool, in accordance with which a slot is made in its casino perpendicularly to-the plane of symmetry of the cutting tool whereby the outer diameter of the support resisting in axial load should be maximal increased, which will result in Herr rigidity and durability of the cutting tool.
The radial force acting upon the casino 45 of the no-try cutting tool secured in the casing I of the holder uniformly presses the casino 45 of the cutting tool at the point ox installation of the radial support which is the closest to the cutter against the arcs 52 and 53 of the end portions 54 and 55 with forces pi = pi (Fix. 4) which are approximately equal to each other.
The fasteners 49, 50 create forces P of tightening the casino *5 of the cutting tool and the surface of the hole 44 of the casino 43 of the holder, which act in the directions coinciding with the forces pi and PI. This in-creases the strength of contact of the outer surface 57 of the casing 45 of the cutting tool and the surfaces 52 and 53 of the end portions I and 55.
In the course of machining, the radial support winch is the remotest from the cutter and the portion of the cutting tool casino 45, in which it is disposed, are load-Ed with a radial force Pi whose value is by 3-5 times smaller than the value of the radial force acting on the radial support which is the closest to the cutter. where .
I I I S
fore, the direction of the line of action of the riddled caused-by the force Pi exerts practically no ln~lu-once on the strength ox connection of the casing 45 of the cutting tool with the casing 43 of the holder because the force P (Figs. 9, 10) ox tightening with the fastener 51 is by on order greater thaw the radial load caused by the force Pi he rotary cutting tool and the holder securing it in a tool carrier, according to the present invention, are easy to manufacture and are characterized by low metal consumption; the service life of the holder is unlimited and, as compared to the known designs of rotary Cutting toots, durability of the rotary cutting tool according to the invention is by 3-4 times greater owing to its treater rigidity. the rotary cutting tool is resistant to vlbra-Sheehan and stability ox the cutter of this cuttirlg tool it by ~.2-1.4 times higher thaw that of the rotary cutting tool of the known designs.
.
.. 27 .' ' . .' '
through the radial supports end the points of fastening the cutting tool casing (the r~stening radial threaded holes) in the holder will in this case coincide.
In order to reduce metal consumption of the cutting tool the amount of labor required for its manufacture, it is guile expedient to aye the cutting tool casing ox a stepped-c71indrical shape, whereby the step of the cut-tin tool casino hiving the outer surface of a wrier duster should preferably be disposed in the direct I-Senate to the cutter US this portion ox the CUttiIlg tool casino contains the radial support of the cutting tool, which is closest to the cutter and determines durability ox the latter because in the course of machining it happens to be the most loaded one. the other portion of the cutting tool casing haying the outer surface ox a staller diameter contains toe radial support resisting a radial force which is by I tires (depending on the design features of the cutter) smaller thin the one act-in upon the radial support disposed next to the cutter.
In view of the fact that this portion of the cutting tool casino does not determine durability of the rotary cut-tying tool and is least loaded in the course of machining the outer diameter of the casing at the point Or install-lion of the support can be substantially decreased as it does no worsen the operating characteristics of the rota-rye cutting tool but reduces its metal consumption.
In order to provide for the process of installation o the support resisting the axial load into the cutting issue tool casing end it removal from the cutting tool casin~during disassembly, it is guile feasible to male a slot opposite the support, from the side of the outer surface of the casing end perpendicularly to the plane of Semite-I ox the cutting tool, it which case it will become no more necessary to preliminarily remove the support.re~isting the radial load when extracting the support resisting the axial load As a result, it becomes possible to place into the cutting tool casing support resisting the axial load of a greater voter diameter than the inner diameter of the seat hole of the cutting tool coin at the point of installation of the radial support closest to the cut-tern An increased outer diameter of the support resiatin~
the axial load increases the diameter on which its solids of revolution sure disposed, Thor raisin resistance of the cutting tool spindle to vibration and increasing rigid duty and durability of the rotary cutting tool. We hove found that on increase in the diameter of the support no-sitting the axial loud by 10~ provide the some increase in the rigidity and durability of the rotary cutting tool, which con be attained by increasing by 25-40% the distance between the supports resisting radial Lindsey However, a greater distance between the radial supports would increase the dimensions of the cutting tool, its metal consumption and the amount of labor required for its manufacture.
The above and other objects are accomplished by that , , 5~3~i~
The above task is accomplished by that in holder for securing a rotary cutting tool in tool-carrier,its casing has a hole to acco~odate the casing of the cutting tool and holes to house fasteners and is made 60 that it partially embraces along an sac the casing Go the cutting tool, end, in sccord~nce with the invention, it hs3 end port Sheehan adjoining along an arc the outer surface of the cut-tin tool cawing and a central portion disposed thereabout-wren end with some gyp from said surface, the casing Or the holder being made so that the ankle at which it embraces the quote tool casing is in the range of 90 to 180 and the holes housing fasteners being arranged coccal rein-live to the threaded holes of the cutting tool casing.
The end portions adjoining along an arc the surface of the cutting tool casing provide for their tight adherence to the casing Or the cutting tool us the radius of the arcs of the end portions corresponds to the radius ox the outer surface of the cutting tool casing. The central port lion disposed between the end portions and with some gap prom the surface of the cutting tool shying provides for uniform distribution of the load over the end Portia owns of the holder, caused by the radial force ox cutting so in the plane of its action (radial force) there is no contact between the outer surface of the cutting tool casing sod the surface of the hole of the holder casing, To supplier mounting of the casing of the rotary cutting tool in the holder the greatest single at which the hot-don casino embraces the casing of the cutting tool should ' be made us to 1~0, since other-wise, in order to con-neat the casing of the cutting tool to the surface of the hole of the holder cgsin~, it is necessary to Rowley-~inaril~ ensure their strict coccal, which hampers the assumably and increases metal consumption of the hot don. It is not recommended to wake the angle ox embracing staller than 90 as otherwise it will cause vibrations of the cutting tool casino in the course of machining due to increased specific pressures on end end portions of the holder.
It it expedient to wake the holes housing fasteners and made in the holder casing coaxial to the threaded ho-lies in the casing of the cutting tool, as otherwise it is extremely difficult to secure the cutting tool casing in the casing of the holler. The casino of the cutting tool is secured in the hole of the holder casing with the aid of such widely used means as screws, pins, etc. which are inserted into the holes housing fasteners and pro-voided in the casing ox the holder end are screwed into the threaded holes from the side of the outer surface of the casino of toe cutting Tao thereby pressing the outer surface of the cutting tool casino anisette toe end portions of the holder.
The solder provides for revile securing of the cussing Or the rotary cutting tool without any deformation of its inner surface of the hole which is a seat one for bearing support. This takes place due to the fact that - tightening forces of the fasteners do Dot cause an deformation in the outer surface of the casing of the cut-~;~5;~35 tying tool but only contribute to its tight (strong) ache-fence to the end percher;
- tightening forces of the fasteners do not cause any deformation in the casing of the holder.
Brief Description of the Invention The following detailed description of a specific em-oddment of the present invention is given with reference to the accompanying drawings, in which:
Fix. 1 show a general view ox a rotary cutting tool with a hole in its casing made eccentrically relative to its outer surface according to the invention, a long-tudina~ section;
Fig. 2 is if view along arrow A in Fig. 1;
Fig. 3 is a section along line III-III in Fig. 2, turned through 90;
Fix. 4 is a section along line IV-IV in Fig. 2, turned through 90;
Fig. 5 shows a general view of a rotary cutting tool, with the outer surface of its casino being of a stepped-cylindrical shape, a variant of embodiment according to .
the invention, a longitudin~1 section;
. Foe 6 is a section along line VOW in it 5;
I 7 shows a general view of a holder for securing`
a rotary cutting tool in a tool-carrier, according to the the invention, a cross-section;
Fig. 8 is a view along arrow B it . 7, turned through 90;
Fig. 9 is a section along line IX-IX in jig. I, ~25~3S
turned through 90;
Fig. 10 is if section along line X-X in Yip. 8, turned through 90.
Detailed Description of the Invention A rightly cutting tool shown in Fig. 1 comprises if casing 1 acco~odating a spindle 2 mounted on supports 3,4 resisting radial loads and a support 5 resisting an axial load, the support 5 being disposed between the radish supports 3 and 4. Cantileverly secured to the spindle Z
us a cutter 6. Axial displacement of the spindle 2 it it-sited by a nut 7 which rests on an inner King of the ray dial support I. Axial displsceme~t of the radial support 4 is limited by a retaining rink 8. The cutter 6 is so-cured to the spindle 2 by means of a nut 9. A Neal 10 and a cap 11 protect from impurities a bearing unit coup-rising the radial supports 3 rod 4 and the support no-siesta an exist load. An outer surface 12 of the casino 1 his the shape of a body of revolution with a eater-eel axis 13.
A hole 14 in -the casing 1 has a geometrical Axis I
and is displaced in the direction along an arrow 16 rota-live to the outer surface 12 of the casing 1 of the cut-tying tool over the value of an eccentricity "en.
Rsdisl threshed holes 17 phase I, 4),-18, 19 are made in the cutting tool casing 1 in the direction oppo-site to the direction along the sorrow 16 of displacement of the eccentricity "e" of the hole 14 of the casing 1 12;~SZ3~
at the points of disposition of the radial supports 3 (jig. 2) and 4 and at the side of the outer surface 12.
The geometrical axes 13 and 15 sure disposed in plane 20 which is the plane of Sumter of toe cutting tool.
At the point of installation of the radish support 3 (Fig. 3) the cutting tool casing 1 has a thickness vying along its perimeter. In the direction of display cement ox the eccentricity "e", indicated by the arrow 16, the thickness of the wall ox tune cutting tool casing 1 decreases monotonously to reach its smallest value Spin which is disposed in the plane 20 Or symmetry of the cut-twig tool. In the direction opposite to the direction indicated by the arrow 16 the thickness of the wall Or the casing 1 ~nr.otonously increases and reaches its greatest valve Smocks which is also disposed in the plane 20 of symmetry of the cutting tool.
At the point of installation of the radial support 4 (Fix. 4) the casing 1 of the quoter tool also has thickness varying along its perimeter. the values of the greatest Sax sod smallest Spin thicknesses of the wall of the casino 1 sure disposed diametrically in the plane 20 of symmetry of the cutting tool The number of fasteners disposed in the casing 1 Or the cutting tool con be increased and, for instance, at the point of disposition of the radial support 4 it con be recommended that during mschi~ing of intermittent surfaces two radial threaded holes disposed at both sides of the plane 20 of symmetry of the cutting tool be jade.
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A rotary cutting tool shown in jig. 5 comprisescasin6 21 having a spindle I mounted on radial support 23t 24 and a support 25 resisting an axial load and en-range between the radial supports 23 and 24. A cutter 26 is cantileverly secured by nut 27 on the spindle 22 - whose axial displacement is limited by 8 nut 28 resting upon an inner ring of the radial support 24, Axing disk placement of the radial support 24 is limited by a retain-in rink 29. A seal 30 and a cap 31 protect the bearing unit from impurities. The outer surface of the casino 21 of the cutting tool is jade of a stepped-cylindrical she-pew whereby a step 32 of the cozily 21 having the outer surface 34 Or a greater diameter is disposed in the dip feat vicinity to the cutter 26. A step 33 of the ceding 21 having the outer surface 35 ox a smaller diameter is the remotest from the cutter 26. A hole 36 of the cutting tool chosen 21 with a geometrical axis 37 is displaced relative to the outer surfaces 34 an I of the casing 21 in the direction indicated by an arrow 38. Because of the different diameters of the steps 32 and 33 of the casing 21 the values of displacement of the eccentricity are different too. The geometrical axis 37 Or the hole 36 is displaced relative to the geometrical axis 39 Or the outer surface 34 of the casing 21 of the cutting tool over a value en. Tlle~eolaetrical axis 37 Or the hole 36 is displaced relative to the geometrical axis 40 of the surface 35 Or the casing 21 over a value en, en > en in any case. The geometrical sues 37, 39 end 40 are disposed ~ZZ~3S
in one plane 41 (Fig. 6) which is the plane of symmetry of the cutting tool, otherwise the labor consumption of manufacture and production C05t of the writer cutting tool increase as the casing 21 becomes difficult to pa-nectar. There is possible a case when the value of displacement Or the eccentricity en I- i. 8. the geomet-rival axis 37 of the hole 36 of the cawing 21 coincides with the geometrical axis 39 of the outer surfs 35, when the metal consumption of the rotary cutting tool decreases.
The stew 32 of the cutting tool casino 21 accomoda-yes the radial support 23 which is the closest to the cutter and which determines the rigidity and durability of the rotary cutting tool as in the course of machining it resists the rusticity loan which by several tires exceeds the loud acting upon the Ludlow support 24. Therefore to Roy reedit of the support 23, it is necessary to increase the thickness of the ~11 Or the coin at the point Or il~stallntion of the radial support I for which purpose the step 32 Or the chosen 21 having the outer Sirius 34 of a greeter diameter should be disposed in the direct vicinity to the cutter 26. The radial support 24 which is the remotest from the cutter 26 does not determine rigidity and durability of the rotary cutting tool us in the course of machining it is loaded with an insignificant radial force, for which reason, in order to decrease metal consumption of the rotary cutting tool, this support 24 should be disposed in the step 33 of the cutting tool - ' .
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casing 21 having the outer surface 35 of a smaller dip-Peter. A slot 42 it 5, 6) necessary for assembly end disassembly of the support 25 18 maze in the cutting tool casing 1 opposite the support 25 resisting en axial load and perpendicularly to iota plane 41 of ~ymmetr~. Provision of the slot 42 in the cutting tool casing 21 makes it pox-sidle to mount the support 25 resisting on axial load of a wrester outer diameter than the outer diameter of the radial support 23 which is the closest to the cutter 260 the increased outer diameter Or the upper 25 inquiry-sues the diameter of the traveling path ox the solids of revolution, the rigidity Or mQUntin~ of the spindle 22 in the support 25 and, consequently, the reedit And durability of the rotary cutting tool as A whole. The slot 42 used for preventing dust from getting into the bearing unit is covered with a casing (not show in the drawings).
It is recommended to make the height h (Fig. 5) and the width C (Fig. 6) of the slot 42 by I mm greater than the height and the outer diameter of thy support 25 nests-tin an exist load.
It is recommended to use thy rotary cutting tool whose casing is provided with s slot for machining intermittent surfaces and in other cases in which impact loads are in-hornet. It is expedient to wake the slot at the side of the staller thickness of the wall of the cutting tool casino as this decreases the amount of labor required for its manufacture.
'I
3LZZS~35 it. 7 shows a holder for securing A rotary Quoted tool in tool-carrier, comprising a casing 43 go 8) which has a hole to accommodate a casino 45 (Fig. 9) of the cutting tori lid holes 46 I 8), 47, 48 for housing Issteners 49 (Fix. 9), 50, 51 (Fix. 10). The casino I of the holder is made so that it partially umbra-cues the casino 45 of the rotary cutting tool along arcs 52, 53. the casing 43 ox the holder has end`portio~s 54 (Fits. 7, 8) and 55 which adjoin the outer surface of the casino 45 of the cutting tool along arcs I end 53, Disco-sod between the end portions 54 and 55 is a central port lion 56 having central angle Jo an arranged with a zap from the outer surface 57 of the casino 45 Or the rotary cutting tool. the casing 43 ox the holder is made so that the angle at which it embraces the casing 45 of the cutting tool is in the range to 90 to 180. the holes 46, 47, 48 housing the fasteners 49,50,51 of the casing 43 of the holder are made coaxial to threaded holes 58, 59, 60 of the casino 45 of the cutting tool. The holder has a shank 61 ho which it is mounted and secured in the tool--carrier of the m~chine-tool.
he hole 44 of the casing 43 of the holder cores-ponds to the outer surface 57 Or the casing 45 Or the cutting tool, thereby providing tight adherence of the end portions I and 55 Or the Collogue 43 of the holder to the outer surface 57 of the casino 45 of the rotary cutting tool along the arcs 52 and 53. Provision Or the end pro lion 54 and I disposed at the both sides of the , Sue central portion 56 ensures uniform force of fasteniIl~ of the cussing 45 of the cutting tool to the end portions 54, 55 and in the course of aching mazes it possible to distribute symmetricfllly the load caused by the cutting force over the casing 43 of the holder, which contributes :.
to its rigidly Since the threaded holes I 59, 60 of .
the casino 45 of the retrieve cutting tool ore jade coaxial to the holes 46, 47, 48 housing the fasteners 49, I, 51, it is not difficult to secure the casing 45 of the rotary cutting tool in the hole 44 of the casing 43 of the holder by way of squire fasteners, for example, the squire 49, 50, 51 into the threaded holes 58, 59, 60 of the casing 45 ox the cutting tool.
It is recommended to choose the angle it which the casino 43 of the holder embraces the casing 45 of the rotary cutting tool depending on the condition of machining. For example, for finish machining when the radial cutting force does not exceed 10-15 kg, the Nile 90-120, for symphonies machining, when the radial cutting force does Slot exceed 35-40 I 120 - 150, in all other cases 150 ' 180 I:
he Nile which determines the position of the central portion 56 ~eparfltin6 the end portion end 55 of the casino 43 of the holder is recommended to be select ted depending on the Nile of embracing or example, with - 90 -120, 30 35 with = 90-150, = 35-40 and with 150 180, 40-90.
If the angle is chosen treater thin thy recommended assess one, this will decrease the length of' the arc of contact Or the end portions 54 and 55 with the outer surface 57 of the casino 45 of the rotary cutting tool and, kinesic-entoil ill decrease the strength of the joint ox the coin 45 of the rotary cutting tool with the casing I of the holder. If the angle is chosen staller than the recomb wended one, the plane in which the resultant of the cut-tying force acts will pass through one of the end portions 54 or 55 of the casino 43 of the holler, which will result in vibrations during Canaan.
In the case when the outer surface ox the cutting -tool casing is of a stepped-cylindrical ape, the surface of the hole of toe holder chosen should be also jade of a step~ed-cylindricsl shape corresponding to the outer sun-face of the casing ox the rotary cutting tool.
During assembly of the casing 45 of the cutting tool with the chosen 43 Or the holder the fasteners 49, 50, 51 tightly press the outer surface 57 Or the cutting tool Reincite the end portions 54 and 55 of the casino I ox the holder The tightening force Our the rssteners 49, 50, I
does not deform the casing 45 of the rotary cutting tool;
as the tightening force of the fasteners 49, 50, 51 in creases the tightness (strength) of adherence of the cay .
sing 45 of the cutting tool to the end portions 54 and So along the arcs 52 and 53 increases too, the shape of slid end portions 54 and 55 corresponding along the whole area of contact to the shape of the outer surface 57 of the casing 45 of the cutting tool The tightening force of .
.
~L2;~:5~3S
the fasneters 49, 50, 51 does jot deform the casing 43 of the holder either, which ensures reliable end durable operation of the rotary cutting tool, and increases its rigidity, preserYillg, at the same time, its small metal consumption.
Principle of Operation A rotary cutting tool shown in issue. 6 and holder for securing it it a tool-c~rrier, shown in its 7-10, jade according to the invention, operate so follows. Prior to machining, a rotary cutting tool is secured in the hole 44 of the assign 43 of the holder, for which purpose the casino 45 of the rotary cutting tool is placed into the hole 44 of the casirlg 43 of the holder in such a wanner tout the geometIicDl axes of the threaded holes 58, 59,60 mode in the easing 45 of the rotary cutting tool coincide with the geometrical axes of the holes 46 I 48 housing the fasteners of the casing 43 of the holder. ThereupoIl, the fasteners 49, 50, 51 are screwed into the threaded holes 58, 59, 60 of the casing of the cutting tool end are tightened to press the casino 45 of the rotary cutting tool against the end portions 54 end 55 of the casing 43 of the holder. As the arcs 52 end 53 forming the end port lions 54 end 55 by their shape correspond to the shape of the outer surface 57 of the casing 45 of the rotary cutting tool. the tightening force provides for tight erroneous of the surface 57 of the casing 45 of the cutting tool to the end portions 54 and 55. As the force of tightening ~2i2523~;i the fasteners 49, 50, 51 increases, the adherence of the outer surface 57 of the casing I of the rotary cutting tools to the arcs 52 and 53 of the end portions 54 and 55 becomes tighter; whereby the force Of tightening the f~sterlers 49, 50~ 51 does not deform the casino; *3 of the holder, wish, in its turn prevents deformation ox the outer surface 57 of the casing 45 of the rotary Quoted; tool and, kinesic-entoil defor~atioII of its hole in which the radial supports are mounted. Besides, this provides for the optimal coy lions of the bearing; unit of the rotary cutting tool during operation.
T.'lith the rotary cutting tool secured in the casino 43 of the holder, the latter in inserted with its shank 61 into the taol-carrier of the machine tool and it secured therein.
The rotary cutting tool shoYJn in Fix. 1 functions as follows. As a result of rotation of the workups and the longitudinal feed of the cutting tool the cutter 6 rotates together with the swindle 2 of t-he awaken tool in the boa-rink unit around the geometrical axis 15. By means of the outer ring of the radial support the radial load PRY
(Fig. 1) is resisted by a limited portion of the seat sun-face of the hole 14 of the Quietly tool casino; 1 in the direction of the live of action of the radial force. The local load dozier of the casino, 1 of the rotary cutting tool at the point of installation of the ray i at Cypriot 3 nigh is most loaded tooth a radial load is essentially a -- 24 _ ~zs~s parabola which is disposed symmetrically relative to the line of action of the radial loan. Since the shape of the outer surface I of the casing 1 of the rotary cutting tool relative to the hole I ox the casing 1 is also a parabolic curve disposed symmetrically relative to the plane of symmetry 20 of the cutting tool, the greatest Sax (Fig. 3) value of the thesis ox the wall of the rotary cutting tool casino 1 corresponds to the greatest value of the radial load acting in the plane of symmetry 20 of the cutting tool. A smaller value of the thesis of the wall of the cutting tool casing corresponds to a smaller value of the radial load, and at the points of the casino 1 where there is no radial load the thic'L~ess of the wall of the casing 1 is the smallest Spin (I ), thy S no-suiting in higher rigidity and durability of the rotary cutting tool, preserving, at the same time, its Dow metal consumption. It is expedient to use the rotary cutting wool shown in jig. 1 in the cases when the radial load acting on the radial support 4 which is the remotest from the cutter 6 is by 3-5 times smaller thaw the radial load acting upon the radial support I. .
In the cases ennui it is necessary to decrease the me-tat consumption of the rotary cutting too it is expedient to use the design of the cutting tool, in accordance with which its casing is made of a stepped-cylindrical shape, the portion of the cutting tool Casey Hun the outer surface of a greater diameter being disposed in the dip feat vicinity of the cutter.
- 25 - :
.
Sue In the cases when the process of machining is kirk-terraced by impact loads it is most expedient to Use the design of the rotary cutting tool, in accordance with which a slot is made in its casino perpendicularly to-the plane of symmetry of the cutting tool whereby the outer diameter of the support resisting in axial load should be maximal increased, which will result in Herr rigidity and durability of the cutting tool.
The radial force acting upon the casino 45 of the no-try cutting tool secured in the casing I of the holder uniformly presses the casino 45 of the cutting tool at the point ox installation of the radial support which is the closest to the cutter against the arcs 52 and 53 of the end portions 54 and 55 with forces pi = pi (Fix. 4) which are approximately equal to each other.
The fasteners 49, 50 create forces P of tightening the casino *5 of the cutting tool and the surface of the hole 44 of the casino 43 of the holder, which act in the directions coinciding with the forces pi and PI. This in-creases the strength of contact of the outer surface 57 of the casing 45 of the cutting tool and the surfaces 52 and 53 of the end portions I and 55.
In the course of machining, the radial support winch is the remotest from the cutter and the portion of the cutting tool casino 45, in which it is disposed, are load-Ed with a radial force Pi whose value is by 3-5 times smaller than the value of the radial force acting on the radial support which is the closest to the cutter. where .
I I I S
fore, the direction of the line of action of the riddled caused-by the force Pi exerts practically no ln~lu-once on the strength ox connection of the casing 45 of the cutting tool with the casing 43 of the holder because the force P (Figs. 9, 10) ox tightening with the fastener 51 is by on order greater thaw the radial load caused by the force Pi he rotary cutting tool and the holder securing it in a tool carrier, according to the present invention, are easy to manufacture and are characterized by low metal consumption; the service life of the holder is unlimited and, as compared to the known designs of rotary Cutting toots, durability of the rotary cutting tool according to the invention is by 3-4 times greater owing to its treater rigidity. the rotary cutting tool is resistant to vlbra-Sheehan and stability ox the cutter of this cuttirlg tool it by ~.2-1.4 times higher thaw that of the rotary cutting tool of the known designs.
.
.. 27 .' ' . .' '
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A rotary cutting tool comprising a plane of symmetry; a casing; an outer surface of said casing, which is essentially the surface of a body of revolution; a hole in said casing with an eccentricity relative to said outer surface of said casing; geometrical axes of said outer sur-face and the hole of said casing being disposed in the same plane which is said plane of symmetry of the cutting tool;
supports resisting radial loads and accommodated in said hole of said casing; a support resisting an axial load and disposed in said hole of said casing between said supports resisting radial loads; a spindle mounted on said supports;
and a bowl-shaped cutter secured cantileverly to said spindle.
supports resisting radial loads and accommodated in said hole of said casing; a support resisting an axial load and disposed in said hole of said casing between said supports resisting radial loads; a spindle mounted on said supports;
and a bowl-shaped cutter secured cantileverly to said spindle.
2. A rotary cutting tool according to claim 1, wherein the outer surface of the cutting tool casing is of a stepped-cylindrical shape, the step of the casing having the outer surface of a greater diameter being disposed in the direct vicinity to the cutter.
3. A rotary cutting tool according to claim 1, wherein a slot is in the casing of the cutting tool at the side of its outer surface, opposite the support resisting an axial load and perpendicularly to the plane of symmetry of the cutting tool.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU3471850 | 1982-08-16 | ||
| SU823471850A SU1112656A1 (en) | 1982-08-16 | 1982-08-16 | Holder for clamping rotary cutter tool |
| SU823501801A SU1135089A1 (en) | 1982-10-28 | 1982-10-28 | Rotary cutter tool |
| SU3501801 | 1982-10-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1225235A true CA1225235A (en) | 1987-08-11 |
Family
ID=26665942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000434453A Expired CA1225235A (en) | 1982-08-16 | 1983-08-12 | Rotary cutting tool and a holder for securing it in a tool-carrier |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT381662B (en) |
| CA (1) | CA1225235A (en) |
| CH (1) | CH661459A5 (en) |
| DE (1) | DE3329262C2 (en) |
| FI (1) | FI71253C (en) |
| FR (1) | FR2531647A1 (en) |
| IT (1) | IT1163909B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433762A (en) * | 2013-08-10 | 2013-12-11 | 江苏江海机床集团有限公司 | Overheating-proof vibration-reduction tool apron |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19617713A1 (en) * | 1996-05-03 | 1997-11-06 | Krupp Kunststofftechnik Gmbh | Holder for a pair of circular knives |
| CN104646709B (en) * | 2014-06-14 | 2017-02-15 | 卢丽 | Eccentric disc machining method |
| CN104647084A (en) * | 2014-06-14 | 2015-05-27 | 卢丽 | Eccentric disc drill clamp |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR781481A (en) * | 1934-09-21 | 1935-05-16 | Rotary trimming tool | |
| AU450099B2 (en) * | 1971-10-12 | 1974-06-27 | Tubemakers Of Australia Limited | Broach for machining of internal weld upset in the electric resistance weld process of pipe manufacture |
| GB1582639A (en) * | 1976-09-21 | 1981-01-14 | Lucas Industries Ltd | Tool assembly for and a method of effecting a rotary turning operation |
-
1983
- 1983-08-09 AT AT0288183A patent/AT381662B/en not_active IP Right Cessation
- 1983-08-11 CH CH4387/83A patent/CH661459A5/en not_active IP Right Cessation
- 1983-08-12 IT IT22563/83A patent/IT1163909B/en active
- 1983-08-12 CA CA000434453A patent/CA1225235A/en not_active Expired
- 1983-08-12 DE DE3329262A patent/DE3329262C2/en not_active Expired
- 1983-08-12 FR FR8313293A patent/FR2531647A1/en active Granted
- 1983-08-16 FI FI832944A patent/FI71253C/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433762A (en) * | 2013-08-10 | 2013-12-11 | 江苏江海机床集团有限公司 | Overheating-proof vibration-reduction tool apron |
Also Published As
| Publication number | Publication date |
|---|---|
| AT381662B (en) | 1986-11-10 |
| CH661459A5 (en) | 1987-07-31 |
| IT1163909B (en) | 1987-04-08 |
| IT8322563A1 (en) | 1985-02-12 |
| FI832944A0 (en) | 1983-08-16 |
| IT8322563A0 (en) | 1983-08-12 |
| FI832944A (en) | 1984-02-17 |
| FR2531647B1 (en) | 1986-02-21 |
| FR2531647A1 (en) | 1984-02-17 |
| DE3329262A1 (en) | 1984-02-16 |
| ATA288183A (en) | 1986-04-15 |
| DE3329262C2 (en) | 1987-02-19 |
| FI71253C (en) | 1986-12-19 |
| FI71253B (en) | 1986-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |