| 1. | A method for cutting bar stock, consisting of fixing the bar stock to be cut, setting a. cutting mechamsm in motion and feeding it towards the outer surface of the bar stock, characterised in that the bar stock(5) is rotated after being fixed, said. cutting mechanism is set simultaneously in linear progressive motion and fed towards the outer surface of the bar stock and cutting is performed with variable number of revolutions, with feeding the cutter along a spiral path and continues at most to a depth equal to 1/2 of the diameter of the bar stock. |
| 2. | A method according to claim 1, characterised in that the cutting of hollow bar stock continues to a depth equal to the thickness of the pipe wall. |
| 3. | A Z13. Ci11I2a' C'. !'1' : ?' S Cs : i :. Cni ?,^, li. l't u'ulL''.,'CCf',CZ ? 3 VPhtCh feeder is mounted, the bar stock being fixed on supporting rollers mounted upon the main body, and a mobile cutting mechanism at the front end of the main body, <BR> <BR> characterised in that 3 bearing frame (3) of said cutting mechanism (9) is mounted at<BR> <BR> the front transverse end (o.) of the Tshaped main body (l), and a rotaryclamping device(8) is disposed between the cutting mechanism(9) and the feeder(4). |
| 4. | A machine according to claim 3, characterised in that said cutting mechanism (9) is an endless band saw(14) disposed between two stretching rollers(15)(15) and positioned vertically in the area of its working Tsecdon by means of two pairs of twisting rollers(16) mounted on the bearing frame(3). <BR> <BR> <BR> <P>. |
| 5. | A machine according to claim 3, further characterised in that said feeder<BR> <BR> (4) is a step feeder and consists of a mobile carriage (17) disposed oncylindrical<BR> guides (18) and secured to the end of the piston bar (i9) of a feeding hydraulic cylinder(20), and a supporting hydraulic cylinder ("Il) is immovably fixed upon the mobile carriage (17), its supporting piston bar(23) iying on one end of the bar stock (:), the opposite end of which lies on a fixed bearing (24) mounted on the mobile carriagetl7} 6.A machine according to claim 3, further characterised in that said rotary clamping device(8) consists of a DC engine (25) connected to a worm (26) and a <BR> wormwheel (27) immovably secured to a carrier (28), which in turn is secured to a carrier body (29) and a cover (303 by means of bearings, and there is a second supporting hydraulic cylinder (31) in said carrier(28),its supporting piston bar (32) lying on one end of the bar stock(5), the opposite end of which lies on a second bearing(35) mounted on the carrier(28). |
BACKGROUND OF THE INVENTION There are known a method and. a machine for cutting pipes especially for pipes of big diameters, which find application particularly in machining of concrete pipes. The method consists of initially fixing the pipe at a desirable angle between the pipe axis and the plane of cutting, and driving the cutting instrument into a compound (both progressive and rotary) motion towards the surface of the pipe, following either circular or elliptic trajectory. Cutting continues until the upper part of the pipe is cut off, at least 1/2 of the diameter of the pipe, after which the pipe is turned at an angle of 180 around its axis and the cutting continues. Cutting is accomplished after several passes of the cutter through the other half of the pipe.
The machine working in accordance with the method described heretofore consists of main frame upon which the pipe to be machined is fixed. At the upper part of the frame carriers are fixed to which a guide is secured with bearings on a traverse. The cutting instrument, comprising a cutting disk (1), is mounted on a holder on the guide above the pipe.
There is known another machine for cutting rigid bodies, in particular pipes, consisting of main body, at the back end of which a feeder is mounted and the pipe to be machined is placed next to its and supporting rollers are placed laterally along the axis of the main body. There is a piston head mounted at the back end of the pipe with an opening in it, and a mobile body inside the pipe which can be seiected in accordance with the diameter of the pipe, said body being attached to a rope coiled on a drum. The bodymoveswithin the pipe by means of compressed air fed by a compressor through the opening of the piston. the compressor being fixed near the piston. The cutting mechanism mounted at the front end of the main body consists of a horizontal and a. vertical beam, a pneumatic cylinder is bound to the horizontal one and a. mobile beam-to the vertical one.
Under the cutting disk there is a rubber ring engaging the shaft of the cutting mechanism and pressing tightly against the outer surface of the pipe thus making it rotate with the rotation of the shaft.. The diameter of the rubber ring is bigger than the diameter of the cutting disk, the ring being elastic in radial direction (2).
SUMMARY OF THE INVENTION Taking into account the prior state of art, the main object of the invention is to provide a method and a machine for cutting bar stock, by means of which a <BR> <BR> <BR> <BR> greater productivity of the process of cutting is achieved because of the regulation of the parameters of cutting, and longer operating life of the cut instrument.
The object of the invention is achieved bv a method for cutting bar stock <BR> <BR> <BR> consisting of the following steps : fixing the bar stock to be cut, driving the cutting mechanism and feeding it towards the outer surface of the bar stock.
According to the invention after fixing the bar stock to be cut, it is rotated simultaneously with the linear progressive motion of the cutting mechanism and its feeding towards the outer surface of the bar stock, the cutting being performed with variable number of revolutions, following a spiral trajectory and continuing at most to a depth equal to 1/2 of the diameter of the bar stock.
According to a variant embodiment of the method for cutting hollow bar stock cutting continues to a depth equal to the thickness of the pipe wall.
The method for cutting bar stock is embodied by a machine for cutting bar stock consisting of main body, where a feeder is mcounted. cne blank i pix or bar stock) being fixed next to it along the axis of the main body on laterally placed supporting rollers and the cutting mechanism being mounted at the front end of the main body. <BR> <BR> <BR> <P> According to the invention a frame bearirg the<BR> <BR> <BR> <BR> <BR> at the front transverse end of the T-shaped main body and a rotary clampmg device is disposed between the cutting mechanism and the feeder.
According to another embodiment of the cutting machine the cutting mechanism is an endless band saw disposed between two stretching rollers and is oriente in a vertical plane in the area of its working T-section by means of two pairs of twisting rollers mounted on the bearing irame.
In another embodiment of the cutting machine the feeder is a step feeder, comprising a mobile carriage mounted on cylindrical guides and secured to the end <BR> <BR> <BR> of the piston bar of a feeding hydraulic cylinder. a supporting hydraulic cylinder is also immovably fixed on the mobile carriage with its supporting piston bar lying on one end of the bar stock, the opposite end of said piston bar being fixed on the mobile carriage.
In another embodiment of the cutting machine the rotary camping device consists of an engine connected to a worm, and a worm-wheei is immovably fixed <BR> <BR> <BR> on a carrier, which in turn is connecte to a carrier body and a cover with bearings, while a second supporting hydraulic cylinder also resides in the carrier, its supporting piston bar lying on the bar stock on one end, the opposite end of said piston bar being secured on a second bearing mounted on the carrier.
According to another embodiment of the machine the second bearing <BR> <BR> <BR> located on the rotary-clamping device is immobile.<BR> <BR> <BR> <BR> <BR> <P> The application of the method and the machine for cutting bar stock, subject<BR> <BR> <BR> <BR> <BR> <BR> C'1 IIIVr''11I2,3rC'G'lCy : II1C :' ; ; ir C3 ;,. L1y V18. 4Fb LL'1Z'-.'1+t.1 r°., duCf',. u iuac, eilal<BR> ira consumption. The above advaniages come as a result of optimisation of the process of cutting, where automatic control and regulation of the parameters of the cutting are possible in order to keep constant working power for a given son of material.
This is done by rotating the bar stock with adjustable revolutions, which change automaticallv with the decreasing of the diameter of the pipe in the process of cutting while keepinr a constant peripheral speed in the zone of cutting, as well as <BR> <BR> <BR> <BR> by automatically changing the speed of feeding of the band saw as a function of its<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> changeable contact length with the section being cut and hence changing the cutting power. <BR> <BR> <BR> <BR> <BR> <P> The cutting continues to a depth equal to the radius of the cross section in<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> the case when solid bar stock is to be cut, while when cutting pipes the cut is equai<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> to the thickness of the pipe wall.<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> <P> Another avantage of the invention is the reduction of material consumption since the automatic optimisation of the process of cutting makes it possible to use a thinner band saw and ensures its longer life of operation. The invention also provides considerable decreasing of noise and pollution, as well as reciucing the reject and accidents among personnel.
The invention finds application in cutting bar stocks of different diameters and length.
The preferred embodiment of the method for cutting bar stock is presented with the drawings enclose herein as follows: Brief description of the Drawings Fig. 1-Top plan view of the machine Fig. 2-Side view of the endless band saw Fig. 3-Cross-secuonal view taken along the line A-A of Fig. 1 Fig. 4-1-Op plan view of the feeder Fig. 5-Cross-sectional view taken along the line B-B of Fig. 4 Fig. 6-Top plan view of the rotary camping device Fig. 7-Cross-sectional view taken along the e C-C of Fig. 6 Fig. S-Top plan view of the band saw and the rotary camping device with the bar stock being cut DESCRIPTION OF THE PREFERRED EMBODIMENTS Further in the description an embodiment of the method for cutting bar <BR> <BR> <BR> <BR> stock in accordance with the invention will be described which can be used for<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> cutting hollow or solid bar stock, as well as for other materials such as concrete pipes, stoneware pipes, etc.
The method for cutting bar stock is implemented in the following sequence: the bar stock to be cut is placed upon supporting rollers and is moved tor setting up in the rotary clamping device. Then the bar stock to be cut is rotated after fixing simultaneously with setting of the cutting mechanism in linear progressive motion <BR> <BR> <BR> <BR> and feeding it towards the outer surface of the bar stock. The cutting is performed with variable number of revolutions with feeding the cutter along a spiral path. and <BR> <BR> <BR> <BR> continues ai most to a depth equal to 1/2 of the diameter of the bar stock. When<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> cutting hollow bar stock is to be done cutting continues to a depth equal to the thickness of the pipe wall.
The method described heretofore can be performed by a machine in accordance with the invention, the machine consisting of T-shaped main body (l). at the front end (2) of which a bearing frame (3) is disposed.. A step feeder (4) is secured on the main body (1) and engages the bar stock to be cut(5), which in turn is set up along the longitudinal axis of the main body (l) on supporting rollers(6). A cutting mechanism (9) with an endless band saw (14) is mounted. on the bearing frame(3), the rotary clamping device(8) being disposed between the band saw (14) and the feeder (4). A cooling system (10) is installed at the front end (2) of the main <BR> <BR> <BR> <BR> body (1) and on both sides of the main body (1) an electnc (Il) and a hydraulic(12)<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> systems are mounted, and a lubricating system is disposed near them.
. 4ccording to a preferred embodiment the cutter is accomplished as an <BR> <BR> <BR> <BR> endless band saw (14) stretched between the outer surfaces of two stretching<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> rollcrs(15),anditsworkingT-sectionbeingverticallyorientedbym eansoftwopairs of twisting rollers (16) mounted on the bearing frame (3.
The feeder'4). preferably a step feeder, is mounted on the prolos part of the main body (l). It consists of a mobile carnage (17) placed upon cylindrical guides (18) and is fixed detachably to the piston bar (19) of a feeding hydraulic cylinder (20). There is a supporting hydraulic cylinder (21) with a lid (22) immovably secured to the carriage(17). The front end of the piston bar 2R) of the supporting hydraulic cylinder(21) partially engages the bar stock to be cut. while the fixed carrier (24), mounted on the carriage (17), partially engages the opposite end of the bar stock (5), and can be changed depending on the diameter of the bar stock or the pressing leg placed right upon the surface of the pipe to be cut. <BR> <BR> <BR> <BR> <BR> <BR> <P> A rotary camping device (8't is disposed between the band saw (14) and the<BR> <BR> <BR> <BR> <BR> feeder (4) and consists of an engine preferably a DC engine, connected with a worm(26), the worm-wheel (27) being stuck immovably on a carrier (28), which in um is secured with bearings to the carrier body (29) of the rotary clamping device (8) and to a cover (30), which is immovably fixed on the carrier body (29). A second <BR> <BR> <BR> supportinghydrauliccylinder(31)ismountedontheearnerf28)withn pistonbm' (32) partially engaging the outer surface of the bar stock(5) to be cut with its front <BR> <BR> <BR> etd (34). There is a se:) I2CLCj'"c'ix:'T ! L ! ;t,'.'l'1 :'LT1' : e' : >'tS2 : t.f"' Sint. l i :-7IIL C=In? G'<BR> <BR> <BR> <BR> <BR> and leg(34). According to another embodiment of the machine the bearing (3t) is movable. There is a covering lid (33) on the carrier(28)andpassgrooves(36) through the cover (30), the carrier (28) and the carrier body (29).
OPERATION OF THE INVENTION The machine for cutting bar stock operates according to the sequence of procedures of the method described heretofore. The bar stock(5) to be processed, a pipe for e. xample. is set up on the supporting rollers (6) and then automatically caught by <BR> <BR> <BR> the step feeder (4) by means of the first fixed bearing (24) and the supporting piston bar (23) of the supporting hydraulic cylinder (21). The mobile carriage (17) is then moved alongthecylindricalguides(IS)bythepistonbar(19)ofthefeeding hydraulic cylinder (20).Being set up in this way, the pipe (5) is moved to the zone of <BR> <BR> <BR> the rotary clamping device(8), released from the feeder (4) and rotated with 5 to 50 rev/min by a DC engine (25), a worm (26) and a wom-wheel (27). The endless <BR> <BR> <BR> band saw (14) is simuiianeousiy set in motion and fed towards the outer surface of<BR> <BR> <BR> <BR> <BR> the pipe (5), the cutting being performed wiih variabie revolutions and feeding of the cutter along a spiral path until the pipe(5) is cut. Meanwhile the feeder(4) is back in its starking position, and so is the band saw (9) after the pipe(5) is cut. <BR> <BR> <BR> <P>Further the pipe (5) is moved forward agsin by the feeder t4 and fed to the rotary clamping device (8), clamped, rotated and cut. the cycle being repeated until the pipe is cut to the necessary number of blanks.
It is to be understood that. the present invention is not limited to the embodiments described above, but encompasses any and all embodiments within the score of the claims to come hereinafter.
List of symbols <BR> <BR> <BR> <BR> <BR> <BR> 1 - main body 19 - first piston bar<BR> 2-front end of the main body20-first hydraulic cylinder 3-bearingframe2<-firsuppomnghydraulic cylinder <BR> <BR> <BR> <BR> <BR> <BR> 4-step feeder 2L-cyWnder's lid<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> 5-bar siock23-piston bar of 1st supporting<BR> <BR> <BR> <BR> <BR> cylinder 6 - supporting rollers 24 - first fixed bearing 7-back end of the main bodv 25-DC engine 8-rotary clamping device 26-worm 9-cutting mechanism27-worm-wheel 10-cooling system28-carrier 11-electrical system29-carrier body 12 - hydraulic system 30 - cover 13-lubricating system 3 i-second supporting cylinder 14 - endless band saw 32 - piston bar or 2nd supporting cylinder 15 - stretching rollers 33 - covering lid 16-twisting rollers 34-outer end of second piston bar 17-mobile carriage35-second fixed bearing 18-eylindrical ides 36-pass grooves