CN1075402C - On-line roll grinding apparatus - Google Patents
On-line roll grinding apparatus Download PDFInfo
- Publication number
- CN1075402C CN1075402C CN98106475A CN98106475A CN1075402C CN 1075402 C CN1075402 C CN 1075402C CN 98106475 A CN98106475 A CN 98106475A CN 98106475 A CN98106475 A CN 98106475A CN 1075402 C CN1075402 C CN 1075402C
- Authority
- CN
- China
- Prior art keywords
- roll
- rail
- grinding
- mentioned
- frame
- 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 - Lifetime
Links
Images
Abstract
A grinding unit 5 comprises grinding wheel 20, a driving device 22 for driving the grinding wheel, and a shifting device 23. When the grinding wheel is subject to vibration of a work roll 1a, vibrating energy is absorbed by deflection of a plain wheel 52 which is integral with an abrasive layer 51 of the grinding wheel and has an elastically deforming function. A rail frame 7 is moved by rail moving devices 30 to tilt a grinding wheel spindle 21 with respect to an axis of the work roll 1a. The rail frame 7 is tilted in opposite directions with respect to the axis of the work roll between when the grinding unit 5 is positioned to grind one end side of the work roll 1a and when it is positioned to grind the other end side thereof. In an on-line roll grinding apparatus, vibration from the work roll is absorbed to enable precise grinding with good roughness of the roll surface without giving rise to any chattering marks, and one work roll can be ground by a single grinding unit up to both roll ends.
Description
The present invention relates to milling train, particularly be arranged on the online roll trimming device on the plate mill, relate in particular to and a kind ofly can not be subjected to the online roll grinding apparatus that roller vibration influences, breaker roll carries out high efficient grinding.
Usually, the roll of plate mill behind rolled plate, only rolling part abrasion on the roll, and and produce step-like injustice between the non-rolling part., be rolled for this reason, restriction is being arranged aspect the rolling process more according to the order from the wide plate to the narrow boards.In order to address this problem, many technology and control methods thereof about online roll dressing machine have been proposed in the prior art.
For example, at Mitsubishi's skill and technique Vol.25 in 1988, " exploitation of online roll dressing machine " of No.4 and Japanese patent gazette are real to be opened in the clear 62-174705 communique, disclosed such technology, promptly, several revolving wheels of configuration on a roll, these several revolving wheels are located in the frame of an integral body, this frame integral body always moves in certain scope, revolving wheel is not to drive rotation by motor, but the revolving force that utilizes roll is driven (related rotation) drivenly, in this wise comprehensive (hereinafter referred to as the 1st prior art) of grinding roller.
Open in clear 58-28705 number the specification in that Japanese patent gazette is real, disclosed such technology, promptly on a roll, dispose a grinding mechanism, and clamp roll, opposite side at grinding mechanism, the touch roll of position sensor is contacted with roll two ends neck, detect the deviation in roll axle center by this position sensor, control force feed device makes revolving wheel follow this deviation (hereinafter referred to as the 2nd prior art).
In phase in the spring conference lecture joint performance of 1992 annual Japanese precision engineering association says that collection of thesis " is located grinding on the machine of roll ", reported following result of experiment.This experiment is to make glass abrasive grain layer of type revolving wheel with borazon body (CBN) abrasive particle, and perpendicular to roll configuration, breaker roll carries out grinding (to call the 3rd prior art in the following text) with the rotating shaft of this revolving wheel.
Open clear 58-28706 number and real opening in clear 62-95867 number the specification in that Japanese patent gazette is real, disclosed such technology, be about to cup type revolving wheel perpendicular to roll configuration, this revolving wheel is installed on the emery wheel rotating shaft and can endwisely slips along it, axially directly or the back side by lug boss supporting revolving wheel, absorb roller vibration (hereinafter referred to as the 4th prior art) by elastomer.
Open in clear 61-242711 number the Japanese patent gazette spy, have and the identical method for grinding of above-mentioned the 1st prior art, disclosed following technology, that is: for a roll, carry out grinding with unique emery wheel, for the total length of grinding roller, near the grinding face (hereinafter referred to as the 5th prior art) of upset emery wheel roll mandrel central authorities.
Open in clear 61-88907 number the Japanese patent gazette spy, disclosed a kind of on-line grinding device that is located on the cross rolling mill, angle right angle from rolling direction in horizontal plane of a pair of working roll axis up and down of this milling train is rolled obliquely.This grinding attachment is followed working roll moves grinding body in horizontal plane.Two ends, the left and right sides in the frame of accommodating grinding body, be provided with and contacted fixedly cushion pad of working roll chock and free buffer pad, make the rail frame follow the working roll chock by these two cushion pads, according to turning moment two cushion pads are supplied with hydraulic pressure simultaneously, make this turning moment balance.This turning moment is by (hereinafter referred to as the 6th prior art) that cause with the contacted grinding body crimping of working roll counter-force difference face at rail frame two ends.
The roll of milling train by be assembled in the roll chock bearing supporting and with rotation at a high speed.For the ease of changing roll or bearing, be provided with the gap at the interior external diameter of this roll chock.In roll when rotation, rotating before and after between this gap movingly.In addition, the roll cylindrical portion has off-centre with respect to bearing portion, and when rolling plate, under the screwdown gear effect, roll has the vibration of above-below direction.These vibrations are superimposed together, and make the roll rotation while vibrating always.
Usually, when processing cylindric working substance, the working substance that is ground is being supported accurately by pivot, carries out grinding under the minimum state of the vibration that makes working substance.But, on milling train during the roll of grinding in rolling, resembling that to carry out grinding the common working substance under the very little state of vibration be impossible, the roll in rolling is rotating while vibrating with the amplitude of 20 μ m-60 μ m, the acceleration about 1g-2g usually.Online roll grinding apparatus must carry out correct grinding under this state.
In above-mentioned 1-the 3rd and the 5th prior art, during the above-mentioned such roll that vibrates of grinding, because dither phenomenon and produce concavo-convex at roller surface.In addition, the impulsive force that is produced by the dither phenomenon also makes the emery wheel abrasion very fast, and wheel life shortens, and must frequently change emery wheel.Contact force when in addition, being difficult to be controlled at predetermined side grinding roller.
In the 1st prior art, owing to be to utilize the revolving force of working roll to drive the emery wheel rotation, so the grinding capacity of each emery wheel is not high.For this reason, need about 6 grinding body for each working roll.In the short milling train of roll length, not having can be for frame about a plurality of grinding bodies being housed in the axially movable space of roll.In the 5th prior art, owing to be to drive an emery wheel rotation, so grinding force more reduces.
In above-mentioned the 4th prior art, be to absorb roller vibration with elastomer.But in this technology, because the whole emery wheel that comprises the abrasive particle chassis is by elastomeric support and move forward and backward, so, the movable part quality of emery wheel, promptly the weight of moving part is just heavier along with vibration.Promptly use the abrasive particle of the high boron nitride of grinding ratio (CBN) cubic crystal abrasive particle as emery wheel, establishing grinding wheel diameter is 250mm, and then the propalinal movable part quality of by elastomeric support comprises emery wheel, sliding bearing, sealing, has at least more than the 5kg.And the contact force variation permissible value of establishing roll and emery wheel is 4kgf, and the vibration amplitude of roll is 30 μ m, and then elastomeric spring constant is necessary for 130kgf/mm.Under such condition, the intrinsic vibration number that comprises the movable part of elastomer is 80c/s.Count under the situation in this low intrinsic vibration,, produce the dither vestige at roller surface, and the abrasion of emery wheel are also fast because the vibration of roll contains elastomeric movable part and produces resonance.If reduce grinding wheel diameter the movable part quality is reduced, then grinding capacity greatly reduces.
In addition, cup wheel can be the endwisely slipping of emery wheel rotating shaft, and the emery wheel back side by elastomeric support.But in roll dressing, cooling water, grindstone dust etc. disperses around emery wheel, and enters between emery wheel and the emery wheel rotating shaft from the sealing that is contained on the vibration emery wheel, influences moving smoothly of emery wheel, is difficult to bring into play long-term and stably the elastomer function.
In above-mentioned the 5th prior art, for total length with a wheel grinding roll, near the grinding face of upset emery wheel (changing the heeling condition of emery wheel rotating shaft) roll central authorities, but the concrete structure of unexposed this upset of realization.
In the roll grinding apparatus of the cross rolling mill that above-mentioned the 6th prior art relates to, absorb the vibration of roll by the cushion pad that is located at the frame two ends, but because the quality of moving part is big, same with the 4th prior art, movable part produces resonance, thereby has the problem because of the high-frequency resonance phenomenon is concavo-convex in the roller surface generation and wheel life shortens.
Because the grinding body of this grinding attachment does not rotate,, produce uneven counter-force at the two ends of the frame of accommodating grinding body so when grinding, need big crimp force.In order to make its balance, follow the alternate angle of roll, need two cushion pads, must suitably control the hydraulic pressure that injects these two cushion pads simultaneously.Therefore the problem that has complex structure.
The purpose of this invention is to provide a kind of online roll grinding apparatus, this device can absorb the vibration of roll and not produce the dither phenomenon, carry out correct and the roll surface roughness good grinding, and grinding mechanism is moved with the angle of the crossing that simple structure is followed roll.
To achieve these goals, online roll grinding apparatus provided by the invention is arranged on and makes on the staggered in the horizontal direction rolling cross rolling mill of at least one pair of roll, this breaker roll can be rotated to support between in opposite directions the frame, and on-line grinding device of the present invention is provided with respect at least 1 grinding mechanism and this grinding mechanism of supporting of at least one roll setting and makes it can be at the axially movable rail frame of roll; The traversing gear that above-mentioned grinding mechanism has the discoid revolving wheel of grinding roller, makes the drive unit of this revolving wheel rotation, revolving wheel is crimped onto the force feed device on the roll and grinding mechanism is moved along the rail frame by the emery wheel rotating shaft; It is characterized in that above-mentioned revolving wheel has the thin plate disk that is installed on the above-mentioned emery wheel rotating shaft and is fixed on this thin plate disk and the abrasive grain layer that is fixed on this thin plate disk one side, this thin plate disk has the elastomer function that absorbs roller vibration; Apparatus of the present invention also have the rail tilting equipment, and this rail tilting equipment makes the moving direction and the roll axle center keeping parallelism of the revolving wheel of grinding mechanism when the rail frame moves, and change the heeling condition of rail frame with respect to frame.
In above-mentioned grinding attachment, above-mentioned rail tilting equipment is a follower, and it makes the rail frame along with the angle of the crossing of roll moves, so that rail frame and roll axle center keeping parallelism.
In above-mentioned grinding attachment, above-mentioned rail tilting equipment preferably is provided with guiding mechanism and rail position control mechanism; Guiding mechanism is located on the above-mentioned frame in opposite directions, and support rail also can fascinate it with respect to above-mentioned frame; The rail position control mechanism make the rail frame along with the angle of the crossing of roll with respect to above-mentioned rack inclining, so that rail frame and roll axle center keeping parallelism.
Above-mentioned rail position control mechanism preferably is provided with rail travel mechanism and controlling organization: rail travel mechanism has the actuator that is located on the above-mentioned frame, and the rail frame is moved on the direction that is toward or away from roll with respect to above-mentioned frame; Controlling organization is controlled the driving of above-mentioned actuator according to the information of the roll angle of the crossing, makes rail frame and roll axle center keeping parallelism.
Above-mentioned rail tilting equipment also can be provided with intersected blocks and rail travel mechanism; Intersected blocks is separately positioned on the above-mentioned frame in opposite directions, joins with the roll chock at back up roll two ends and pushes this roll chock; Rail frame two ends and above-mentioned intersected blocks are joined in rail travel mechanism, so that the rail frame can integrally be moved with intersected blocks.
Above-mentioned revolving wheel is configuration so preferably, that is, see in the middle of emery wheel, and the contact wire of above-mentioned abrasive grain layer and roll only is formed on emery wheel one side.
In addition, above-mentioned rail travel mechanism also is provided with stop member, and when actuator makes the rail frame on the direction that is toward or away from roll when mobile, this stop member is used to make rail frame location.In more detail, above-mentioned rail travel mechanism also is provided with the block that moves on the direction that is toward or away from by the screw rod of above-mentioned actuator rotation, by being rotated in of this screw rod and roll and frame is kept and the join device for exerting of state of above-mentioned block.
Above-mentioned abrasive grain layer preferably comprises borazon body abrasive particle or diamond abrasive grain.
Below, the effect and the action of the grinding attachment of the present invention with above-mentioned structure are described.
At first, one of the present application people is in the US.No.08070760 (applying date: 1993.6.3), a kind of online roll grinding apparatus has been proposed, this grinding attachment have in the face of the discoid revolving wheel of roll in a pair roller and this roll of grinding, by the emery wheel rotating shaft make this revolving wheel rotation drive unit, above-mentioned revolving wheel is crimped on the force feed device on the roll and makes revolving wheel along the axially movable traversing gear of roll; It is characterized in that above-mentioned revolving wheel has thin plate disk that is installed on the above-mentioned emery wheel rotating shaft and the abrasive grain layer that is fixed on this thin plate disk one side, this thin plate disk has the elastomer function that absorbs roller vibration.
And proposed the configuration of above-mentioned revolving wheel, that is, made above-mentioned emery wheel rotating shaft with respect to the vertical direction in roll axle center one tiny inclination angle be arranged, like this, central authorities see over from emery wheel, the contact wire of abrasive grain layer and roll just only be formed on roll mandrel to a side.
In above-mentioned invention in first to file, make thin plate disk have the elastomer function as a discoid revolving wheel part, when revolving wheel was urged because of roller vibration, the deflection of thin plate disk absorbed the vibration of roll instantaneously.Like this, the change of abrasive grain layer and roll shop building contact force only the elastic force that produces by the deflection of thin plate disk such one among a small circle in, so, can eliminate the dither phenomenon.In addition, making the chassis of supporting abrasive grain layer is that the thin plate disk has the elastomer function, and abrasive grain layer and elastomer functional part become an integral body.Therefore, moving quality is abrasive grain layer and thin plate disk by roller vibration, and the movable part quality becomes very little, and the intrinsic vibration number of revolving wheel improves.So, can not produce dither phenomenon because of causing with vibration roll resonance, can correctly carry out grinding over a long time.
In addition, by following such configuration revolving wheel: promptly, the emery wheel rotating shaft is tilted, the contact wire of abrasive grain layer and roll only is formed on the side apart from emery wheel central authorities, the thin plate disk is under the crimp force effect of breaker roll, with the deflection of cantilever beam form, bring into play the elastomer function of thin plate disk efficiently, can easily absorb the vibration of roll.In addition, because contact wire is formed on the side apart from the emery wheel center, so can prevent the dither phenomenon more.
Grinding attachment of the present invention is to have utilized above-mentioned invention in first to file, and has same purpose in first to file.That is, absorb the vibration of roll, do not produce the dither phenomenon, can correctly and make roll surface roughness carry out grinding well.
For purpose of the present invention, when grinding mechanism grinding upper working rolls and lower working rolls is installed, change the heeling condition of rail frame with respect to frame by the rail tilting equipment on cross rolling mill, accompany or follow the angle of the crossing with simple structure emery wheel is moved, easily grinding roller.
That is, make the rail frame along with the angle of the crossing of roll moves, so that rail frame and roll axle center keeping parallelism by hunting gear.In more detail, the rail frame is by guiding mechanism supporting and can fascinate with respect to frame, position control mechanism make the rail frame along with the angle of the crossing of roll with respect to above-mentioned rack inclining, so that rail frame and roll axle center keeping parallelism.Example as the rail position control mechanism is provided with rail travel mechanism and controlling organization; Rail travel mechanism makes the rail frame move on the direction that is toward or away from roll with respect to frame by actuator; Controlling organization is controlled the driving of above-mentioned actuator according to the angle of the crossing information of roll, makes rail frame and roll axle center keeping parallelism, so just can follow the angle of the crossing emery wheel is moved.Under this situation,, can accurately set the inclination angle of rail frame by the stop member that setting is located the rail frame.In addition, in above-mentioned rail travel mechanism, screw rod is set, by the rotation of this screw rod make block with roll near and away from direction on move, keep the state that joins of this block and rail frame by spinning apparatus, like this, can be accurately the inclination angle of rail frame be located on the required angle.
On frame in opposite directions, intersected blocks is set respectively at milling train, this intersected blocks butt and when pushing the roll chock at back up roll two ends, rail travel mechanism also can be set as the rail tilting equipment, this rail travel mechanism makes rail frame two ends and above-mentioned intersected blocks butt, rail frame and intersected blocks are integrally moved, so also can follow the angle of the crossing emery wheel is moved.
Accompanying drawing is represented embodiments of the invention, wherein:
Fig. 1 is the local section side view of milling train major part that is provided with the online roll grinding apparatus of another embodiment of the present invention;
Fig. 2 is the XII-XII line sectional drawing among Fig. 1;
Fig. 3 is the X III-X III line sectional drawing among Fig. 2;
Fig. 4 is the cross-sectional view of grinding mechanism;
Fig. 5 is the skiagraph of grinding mechanism;
Fig. 6 is the figure of configuration, structure and the absorption vibration effect thereof of expression revolving wheel;
Fig. 7 is the location diagram of the revolving wheel in two grinding mechanisms of expression;
Fig. 8 is the figure of the control system of the online roll grinding apparatus of explanation;
Fig. 9 is the control sequence flow chart that angle of the crossing grinding is followed in expression;
Figure 10 joins rail frame and intersected blocks, follows the embodiment skeleton diagram that roll control rail frame tilts;
Figure 11 is the local section plane of milling train major part that is provided with the online roll grinding apparatus of other embodiment of the present invention;
Figure 12 is the X IX-X IX line sectional drawing among Figure 11.
Below, with reference to the description of drawings embodiments of the invention.
At first, with Fig. 1-Figure 10 the 1st embodiment of the present invention is described.
Among Fig. 1-Fig. 3, the milling train that present embodiment relates to is 4 roller mills, and it comprises: make a pair roller (operation roller up and down) 1a, the 1a of stocking S extension, a pair roller (strengthening roller up and down) 1b, the 1b of back up roll 1a, 1a.Invest the roll bending machine 30,30 of roll 1a, 1a deflection, the skewing mechanism 40,40 that roll 1a, 1a are intersected in the horizontal direction.
In such milling train, be provided with the online roll grinding apparatus of present embodiment.The online roll grinding apparatus of present embodiment, two of having that top working roll 1a uses go up two following grinding mechanism 6a, the 6b (similarly using " 6 " to represent) that grinding mechanism 5a, 5b (following common expression they time with " 5 " representative) and bottom working roll 1a use.
Fore side end and driving side end that last grinding mechanism 5a, 5b correspond respectively to top working roll 1a are being provided with, and can carry out grinding independently of each other.Following grinding mechanism 6a, 6b are being provided with corresponding to the fore side end and the driving side end of bottom working roll, also can carry out grinding independently of each other.These grinding mechanisms 5a, 5b, 6a, 6b have identical construction, so this structure is that representative describes with grinding mechanism 5.
As shown in Figure 4 and Figure 5, grinding mechanism 5 be provided with grinding working roll 1a discoid revolving wheel 20, by emery wheel rotating shaft 21 make 20 rotations of this revolving wheel drive unit 22, revolving wheel 20 is crimped on force feed device 23 on the working roll 1a, makes the axially movable traversing gear 24 of revolving wheel 20 at working roll 1a.
Revolving wheel 20 has the ring-type abrasive grain layer 51 on the thin plate disk 52 of being with lug boss 52a and the opposite side of lug boss that is fixed on thin plate disk 52 shown in amplification among Fig. 6, thin plate disk 52 is installed on the emery wheel rotating shaft 21 by lug boss 52a.This thin plate disk 52 has the elastomer function that absorbs the working roll vibration, and its deflection can change with the contact force between working roll 1a and the abrasive grain layer 51.In order to have the elastomer function, thin plate disk 52 preferably has the spring constant of 1000kgf/mm-30kgf/mm, and is then better as if the spring constant with 500kgf/mm-50kgf/mm.Abrasive grain layer 51 sticks into one by bonding agent and thin plate disk 52, can stably connect airtight on vibration working roll 1a.
As shown in Figure 6, the emery wheel rotating shaft 21 axle center GC1 of revolving wheel 20 have a small skew angle a with respect to the vertical line Sc of working roll 1a axle center RC, see in the middle of emery wheel, only form the contact wire of abrasive grain layer 51 and working roll 1a in a side.Inclined angle alpha is preferably 0.5 °-1.0 °.By disposing revolving wheel 20 in this wise, can bring into play the elastomer function of thin plate disk 52 effectively.
As shown in Figure 4, drive unit 22 has and drives revolving wheel 20 with the hydraulic motor 54 (also can be electro-motor) of predetermined emery wheel peripheral speed rotation, the rotation of the output shaft 54a of hydraulic motor 54 is passed to the Pulley shaft 54b and the belt 55 of emery wheel rotating shaft 21, and output shaft 54a and Pulley shaft 54b are by parallel splined shaft 54c connection.Belt pulley 54b can be rotated to support on the matrix 59.Emery wheel rotating shaft 21 by sliding-type journal bearing 21a, 21b is rotatable and can be bearing in the matrix 59 with moving axially.At an end opposite with revolving wheel of emery wheel rotating shaft 21, the load cell 53 of measuring contact force between revolving wheel 20 and working roll 1a is housed in the matrix 59.
Matrix 59 is housed in the housing 25, and hydraulic motor 54 is installed on the housing 25.As shown in Figure 5, matrix 59 axially movably carries bottom at housing 25 by sliding bearing 25a along emery wheel rotating shaft 21.
As shown in Figure 4, force feed device 23 has the encoder 57a of the force feed motor 57 that is installed on the housing 25, no backlash type prepressing type snap bolt 56 and detection force feed motor 57 anglecs of rotation.Also can anti-backlash gear mechanism replace prepressing type snap bolt 56.This snap bolt 56 is by the rotation of force feed motor 57, and matrix 59 is moved on the direction that is toward or away from working roll 1a, with revolving wheel 20, emery wheel rotating shaft 21 and load cell 53 together toward front and back to force feed.
As shown in Figure 5, traversing gear 24 have the motor 58 that traverses that is installed on the housing 25, on the rotating shaft that is contained in the motor 58 that traverses and with the pinion 58a of tooth bar 14 engagements, be contained in the top of housing 25 and with the chimeric two pairs of deflector rolls 26 of pair of guide rails 7a, 7b, detect the encoder 58b of motor 58 rotation numbers of traversing.As shown in Figures 1 and 2, guide rail 7a, 7b are installed on the rail frame 7, and this rail frame 7 is erected at the entrance side of working roll 1a along the axle center of working roll 1a.Tooth bar 14 be formed on guide rail 7b with the working roll opposite sides on.Grinding mechanism 5 is bearing on the rail frame 7 by deflector roll 26 and guide rail 7a, 7b, under the engagement of the rotation of the motor 58 that traverses and pinion 58a and tooth bar 14, can successfully move along the roll axis direction.
As shown in Figure 7, the revolving wheel 20 of grinding mechanism 5a and the revolving wheel 20 of grinding mechanism 5b are configurations like this, promptly, the axle center Gc1 of emery wheel rotating shaft 21 separately, the vertical line Sc of working roll 1a axle center Rc has reverse each other tiny inclination angle α relatively, see in the middle of the emery wheel, the making contact to of abrasive grain layer 51 and working roll 1a only be formed on roll mandrel to close end one side.The revolving wheel 20 of grinding mechanism 6a and the revolving wheel 20 of grinding mechanism 6b also are similarly to dispose, and like this, just can be ground to the both ends of working roll 1a with the frame interference-free always.
Skewing mechanism 40 as shown in Figure 3, by with roll chock 3 butts and push roll chock 3 intersected blocks 41, make intersected blocks 41 propalinal pistons 42, the displacement meter 43, the hydraulic pressure chamber 44a of pushing piston 42 and the hydraulic pressure chamber 44b that piston 42 is returned that measure piston 42 amount of movements constitute.
As shown in Figure 8, the motor 32 of the traverse motor 58 and the rail mobile device 30 of the force feed motor 57 of force feed device 23, traversing gear 24 is respectively by control device 13a, 13b, 13d control.The motor of the encoder 57a of load cell 53, force feed device 23, the encoder 58b of traversing gear 24, rail mobile device 30 is sent to information processing device 13c with the detection signal of the displacement meter 43 of encoder 33 and skewing mechanism 40 and handles.
Rail mobile device 30 constitutes rail travel mechanisms, and it has the actuator (motor) 32 on frame of being located at 4, makes rail frame 7,8 move in the direction that is toward or away from roll 1a, 1a relative to frame 4.Information processing device 13c, control device 13a, 13b, 13d, encoder 33,57a, 58b and displacement meter 43 constitute controlling organizations, and according to the information of the angle of the crossing of relevant roll, the driving of control actuator 32 makes rail frame 7,8 relative roll axle center keeping parallelisms.
According to above-mentioned, guide 9, information processing device 13c, control device 13a, 13b, 13d, encoder 33,57a, 58b and displacement meter 43 have the effect of rail tilting equipment, make the moving direction of grinding mechanism 5a, 5b, 6a, the 6b revolving wheel 20 when rail frame 7,8 moves be parallel to the roll axle center, and the heeling condition of change rail frame 7,8 relative frames 4, the angle of the crossing that like this, just can make rail frame 7,8 follow roll moves with being parallel to roll 1a, 1a axle center.
Below, the action and the control of the online roll grinding apparatus of present embodiment are described.
The action of the revolving wheel 20 in the online roll grinding apparatus of present embodiment at first, is described.
Working roll 1a is vibrating according to the vibration number of mill speed with 10-150c/s.Install when having the roll grinder of general cylindrical shape emery wheel in on-line grinding device in the past, the cylindrical shape emery wheel contacts with the abrasive particle of working roll by wheel face, and the metal of roller surface and abrasive particle carry out grinding with colliding.
When abrasive particle contacted with the work roll surface metal, working roll was ground, and had been right after the in a flash following of this grinding, and emery wheel breaks away from working roll, abrasive particle idle running.This discontinuous grinding is the reason that produces dither, and the result causes work roll surface and section is uneven.
If make the emery wheel vibration identical with the vibration of working roll, then the contact force of emery wheel and working roll does not change.But, because the vibration of working roll is the dither of 150c/s, so be difficult to make the whole and working roll synchronous vibration of emery wheel and grinding carriage, if for the vibration that makes working roll does not break away from emery wheel and grinding carriage integral body, and make emery wheel itself have the elastomer function, and absorb vibration with the amount of deflection of emery wheel, then the movable part quality diminishes, can promptly follow the vibration of working roll, make the minimizing that becomes of contact force between emery wheel and working roll.
In the present embodiment, have the elastomer function by feasible thin plate disk 52, and make emery wheel itself have the elastomer function as revolving wheel 20 parts.Making this revolving wheel 20 is the speed rotation of 1000m/min-1600m/min with the outer peripheral speed of its abrasive grain layer 51, is crimped on simultaneously on the rotary work roller 1a, makes the revolving wheel deflection.Working roll 1a porpoise as described above.By this vibration pushing revolving wheel 20, at this moment, as shown in Figure 6, deflection takes place in thin plate disk 52, absorbs the vibration of working roll 1a instantaneously.Like this, the change of contact force between abrasive grain layer 51 and working roll 1a only elastic force that the deflection by thin plate disk 52 produces among a small circle in, can eliminate the dither phenomenon.
In addition, when desiring to make emery wheel itself have the elastomer function, in the cylindrical shape emery wheel, because working roll and emery wheel rotating shaft be arranged in parallel, so, be difficult to make emery wheel itself to have the elastomer function.And adopt the situation of discoid emery wheel, because working roll almost is vertical with the emery wheel rotating shaft, so, be easy to make emery wheel itself to have the elastomer function, therefore, it is effective coming grinding to vibrate working roll with discoid emery wheel.
That is in the present embodiment, be that feasible thin plate disk 52 as abrasive grain layer 51 chassis has the elastomer function.In order to make it bring into play this elastomer function effectively, dispose revolving wheel 20 as shown in Figure 6, that is, make abrasive grain layer 51 and the contact wire of working roll 1a only be formed on a side of leaving emery wheel central authorities.Like this, under the effect to working roll 1a crimp force, the cantilever beam shape deflection of thin plate disk 52 can absorb the vibration from working roll 1a.
Because abrasive grain layer 51 is ring-types, even make revolving wheel 20 crimping working roll 1a abreast, owing to partly supporting by two place's abrasive grain layers of emery wheel central authorities both sides, so thin plate disk 52 also can produce deflection.But, at this moment owing to being two supports, so deflection reduces.
If adopt present embodiment so at one end to support, then use same thin plate disk 52 can obtain bigger deflection.
Exist the permission excursion of contact force between working roll and emery wheel according to the grinding capacity of abrasive particle on the emery wheel.Making emery wheel itself have under the situation of elastomer function,, must possess following condition even for working roll vibration and contact force still remains on aptly and allows not produce resonance with emery wheel in the excursion:
F≥K×A
max
In the formula, the permission excursion of F-contact force,
A
Max-working roll one way amplitude,
The elastomeric spring constant of K-.
That is, obtain K≤F/A
MaxWhen the elastomeric spring constant of emery wheel itself less than allowing under the excursion and working roll one way amplitude A by the emery wheel contact force
MaxDuring the spring constant K that obtained, emery wheel can follow hard on working roll and carry out grinding.
When the intrinsic vibration number of emery wheel was consistent with the vibration number of working roll, emery wheel produced resonance, can not carry out correct grinding.Therefore, preferably the intrinsic vibration number of emery wheel is set to such an extent that depart from the vibration number of working roll as far as possible.
F
n＞F
rmax
In the formula, F
nThe intrinsic vibration number of-emery wheel,
F
Rmax-working roll maximum vibration number.
The intrinsic vibration number of emery wheel can be represented by the formula:
In the formula, M is the quality (movable part quality) that comprises elastomeric emery wheel.Therefore, when the intrinsic vibration of increasing emery wheel is counted, must increase elastomeric spring constant k or reduce to comprise elastomeric emery wheel quality.As previously mentioned, elastomeric spring constant can not be worth (F/A greater than certain
Max).When the intrinsic vibration of increase emery wheel is counted, must reduce to comprise elastomeric emery wheel quality.
For example, work as F=4kgf, A
MaxDuring=30 μ m, k=133kgf/mm, therefore, if hypothesis F
RmaxBe 150c/s, F
nBe 400c/s, the movable part mass M that then must will comprise revolving wheel suppresses to be 0.2kg.
When the emery wheel abrasive particle is general used aluminium oxide (Al
2O
3) or during carborundum (SiC), if be 0.2kg with the emery wheel quality control, then emery wheel will soon consume, and must change emery wheel several times in one day, this is greatly unfavorable for working roll ground effect in the milling train.
In order to address this problem, must adopt the high emery wheel of grinding ratio (the minimizing volume of the minimizing volume/emery wheel of working substance).
Now, adopt general aluminium oxide (Al
2O
3) or the emery wheel of carborundum (SiC) class abrasive particle, during grinding hard working roll, its grinding ratio is difficult to reach more than 3.But with the crystal boron nitride abrasive grain (being commonly referred to CBN) of super abrasive particle or the revolving wheel 20 of the present embodiment that diamond abrasive grain is made, when grinding working roll 1a, its grinding ratio surpasses 300, than using aluminium oxide (Al
2O
3) or the emery wheel made of carborundum (SiC) class abrasive particle big more than 100 times.Owing to made full use of the high grinding ratio of super abrasive particle, this abrasive particle is used on the emery wheel of online roll grinding apparatus, just can carry out long grinding with little weight.
In addition, in the present embodiment, the chassis that also will be stained with abrasive grain layer 51 is as thin plate disk 52, and gives this thin plate disk 52 with the elastomer function, makes abrasive grain layer 51 and elastomer functional part become an integral body.Therefore, because of the movable quality of the vibration of working roll 1a only is abrasive grain layer 51 and thin plate disk 52, so it is very little that the movable part quality can be reduced to, so can improve the intrinsic vibration number of revolving wheel 20.
Therefore, in the present embodiment, in order to reduce the movable part quality, adopted the super abrasive particle of grinding ratio height (in light weight and wheel life is grown) to make abrasive grain layer 51, thin plate disk 52 all-in-one-piece revolving wheels, 20 rotations that make and have suitable spring constant also are crimped on the working roll 1a, can eliminate because of moving the dither phenomenon that occurs, can carry out correct grinding for a long time with the resonance of vibration working roll.
And, make the emery wheel rotating shaft 21 of above-mentioned revolving wheel 20 carry out grinding at contact wire place, a place obliquely, can bring into play high grinding capacity, an available grinding mechanism 5 is ground to the two ends of roll always.
Below, the control of the online roll grinding apparatus of present embodiment is described with Fig. 9.
At first, send the instruction (step 200) of the angle of the crossing change of working roll,, in the hydraulic pressure chamber 44a of skewing mechanism 40, inject hydraulic pressure, move roll chock 3 (step 201-204) by intersected blocks 41 according to this instruction by the host control device that do not show of figure.Move to Rc2 from Rc1 in the working roll axle center, and this moves by the signal of displacement meter 43 confirms (step 205).Indication according to angle of the crossing change before move in the axle center of working roll, makes grinding mechanism 5 retreat (step 206).After move in the axle center of working roll, move indication (step 207) for rail mobile device 30, make motor 32 rotations (step 208), make rail frame 7,8 make move (step 209) of multiple operation roll shaft heart Rc2.At this moment, by the measured value of information processing device 13c, confirm that whether rail frame 7,8 is parallel to working roll axle center Rc2, if parallel, then stops to move (step 210) according to the motor usefulness encoder 33 of displacement meter in the skewing mechanism 40 43 and rail mobile device 30.
Like this, be parallel to the working roll axle center by rail frame 7,8 is moved to, grinding mechanism 5,6 just can similarly carry out grinding control with non-cross rolling mill.
In cross rolling mill, make the rail frame with another embodiment that the angle of the crossing of roll moves with Figure 10 explanation, in the present embodiment, make rail frame 70 contact intersected blocks 41, along with the change of the angle of the crossing is moved rail frame 7.
That is, with similarly above-mentioned, according to the instruction of the host control device of scheming not show, control skewing mechanism 40 moves intersected blocks 41.The two ends that will have the rail frame 70 of guide rail 70a, 70b by the 46a of self-aligning spherical support portion, 46b are connected on this intersected blocks 41, and and then follow cylinder 45 crimping with intersecting, intersected blocks 41 and rail frame 70 are accompanyed or follow are moved.Like this, as long as intersected blocks 41 moves, rail frame 70 just always moves in the horizontal direction, if do not have the gap between the 46a of self-aligning spherical support portion, 46b, working roll axle center Rc is always parallel with rail frame 70.The action of another rail frame 80 also is same.
Figure 11 and Figure 12 represent the 3rd embodiment of the present invention.Present embodiment is to be provided with baffle plate or bolt in the above-described embodiments the rail mobile device, thereby can set the parallel degree of the inclination angle of revolving wheel axle or rail frame and roll more accurately.
Among Figure 11 and 12, rail mobile device 30A by electromechanical stop 35, be provided with the lead screw shaft 34A, the motor 32 that makes lead screw shaft 34A rotation that make the screw mandrel 34 that electromechanical stop 35 moves, the rotation that makes motor is slowed down and pass to lead screw shaft 34A decelerator 31, detect the encoder 33 of motor 32 rotations, integrally be located at rail frame 7 top, with electromechanical stop 35 butts and make the block 71 of rail frame 7 location and pin joint on rail frame 7, rail frame 7 is constituted towards the oil hydraulic cylinder 36 that roll 1a pushes away with predetermined power.Lead screw shaft 34A can be rotated to support on support 34a, the 34b by bearing, and this support 34a, 34b integrally are fixed on the guide 9.The spline bar 34c of electromechanical stop 35 is being set in the upper end of support 34a, 34b.Decelerator 31, motor 32 and oil hydraulic cylinder 36 are fixedly supported upon on the support plate, and this support plate is fixed on the frame 4.
During with roll dressing mechanism 5 grinding rollers, high pressure is imported oil hydraulic cylinder 36, block 71 is crimped on the electromechanical stop 35, make rail frame 7 location, do not allow grinding mechanism 5 under the effect of grinding counter-force, retreat simultaneously with bigger power.At this moment, the gradient that is keeping rail frame 7 by electromechanical stop 35 accurately.In the time will changing the gradient of rail frame 7, reduce to import the pressure of the pressure oil in the oil hydraulic cylinder 36, make the crimp force of 71 pairs of mechanism's blocks 35 of block reduce.When so far making motor 32 rotation under the state, electromechanical stop 35 moves forward and backward because of the rotation of screw mandrel 34, rail frame 7 under electromechanical stop 35 and state that block 71 maintenances engage forwards or the rear move.Like this, the rotation amount and the direction of rotation of the motor 32 of the rail mobile device 30A by control operation side and driving side can be required angle with the tilt angle varied of rail frame just.At this moment, because the mobile of rail frame is by screw mandrel 34 rotations are carried out, so can make rail frame 7 location accurately under the state of electromechanical stop 35 and block 71 maintenance butts.Like this, along with the change of the angle of the crossing, keep the parallel degree of rail frame 7 and roll 1a accurately.
When changing roll stacks, oppositely supply with oil hydraulic cylinder 36 pressure oils, oil hydraulic cylinder 36 is shunk, rail frame 7 is moved so that do not disturb with roll chock toward the rear.
In addition, be that the rotation with motor 32 makes screw axis 34A rotation in the present embodiment, if but the rotation that is provided with motor 32 makes the propalinal mechanism of bar, electromechanical stop 35 is located on this bar, also can obtain same effect.
As mentioned above, according to the present invention,,, can correctly carry out the surface roughness good grinding so can not produce dither and covibration because the elastomer function of the thin plate disk of revolving wheel has absorbed the vibration of roll.
In addition, in cross rolling mill, as long as just can be easily carry out grinding with the angle of the crossing of grinding mechanism because the rail frame is moved, so, the surface of energy grinding roller on cross rolling mill, and do not produce the step that leads between board and the logical board, that can envision fully on cross rolling mill is rolling.
Claims (8)
1. online roll grinding apparatus, be located at make at least one pair of can be rotated to support in opposite directions the roll between frame carries out on the cross rolling mill of tandem rolling in the horizontal direction, this grinding attachment is provided with at least with respect at least one grinding mechanism of a roll setting and this grinding mechanism of supporting and can makes it at the axially movable rail frame of roll, and above-mentioned grinding mechanism has the discoid revolving wheel of grinding roller, make the drive unit of this revolving wheel rotation by the emery wheel rotating shaft, revolving wheel is crimped on force feed device on the roll, the traversing gear that grinding mechanism is moved along the rail frame; It is characterized in that:
Above-mentioned revolving wheel has thin plate disk that is installed on the emery wheel rotating shaft and the abrasive grain layer that is fixed on this thin plate disk one side, and this thin plate disk has the elastomer function that absorbs roller vibration,
Also have the rail tilting equipment, this rail tilting equipment makes the rail frame follow the angle of the crossing of aforementioned roll and move, and makes the axle center keeping parallelism of aforementioned rail frame with respect to aforementioned roll.
2. as the online roll grinding apparatus of claim 1 record, it is characterized in that above-mentioned rail tilting equipment is provided with intersected blocks and rail travel mechanism; Intersected blocks is located at respectively on the above-mentioned frame in opposite directions, joins with the roll chock at back up roll two ends and pushes this roll chock; Rail frame two ends and above-mentioned intersected blocks are joined in rail travel mechanism, so that the rail frame can integrally be moved with intersected blocks.
3. as the online roll grinding apparatus of claim 1 record, it is characterized in that above-mentioned abrasive grain layer is nitrogen polycrystalline cubic boron body abrasive particle or diamond abrasive grain also.
4. as the online roll grinding apparatus of claim 1 record, it is characterized in that above-mentioned revolving wheel is configuration like this: promptly, see over, the contact wire of above-mentioned abrasive grain layer and roll only is formed on a side in the middle of emery wheel.
5. as the online roll grinding apparatus of claim 1 record, it is characterized in that above-mentioned rail tilting equipment is provided with guiding mechanism and rail position control mechanism, guiding mechanism is located on the above-mentioned relative frame, and support rail also can make it fascinate with respect to above-mentioned frame; The rail position control mechanism makes the rail frame along with the above-mentioned relatively rack inclining of the angle of the crossing of roll, so that rail frame and roll axle center keeping parallelism.
6. as the online roll grinding apparatus of claim 5 record, it is characterized in that above-mentioned rail position control mechanism is provided with rail travel mechanism and controlling organization; Rail travel mechanism has the actuator that is located on the above-mentioned frame, make the rail frame relative to above-mentioned frame with roll near and away from direction on move; Controlling organization is controlled the driving of above-mentioned actuator according to the information of the angle of the crossing of roll, makes rail frame and roll axle center keeping parallelism.
7. as the online roll grinding apparatus of claim 6 record, it is characterized in that above-mentioned rail travel mechanism also is provided with stop member, this stop member be used for actuator make the rail frame with roll near and away from direction when moving, make rail frame location.
8. as the online roll grinding apparatus of claim 6 record, it is characterized in that, above-mentioned rail travel mechanism also is provided with the screw mandrel by above-mentioned actuator rotation, by the rotation of this screw mandrel with roll near and away from direction on move block, the rail frame is kept and the join device for exerting of state of above-mentioned block.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5126189A JP3022702B2 (en) | 1993-05-27 | 1993-05-27 | Online roll mill |
| JP126189/93 | 1993-05-27 | ||
| JP126189/1993 | 1993-05-27 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94105833A Division CN1068252C (en) | 1993-05-27 | 1994-05-25 | On-line roll grinding apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1205256A CN1205256A (en) | 1999-01-20 |
| CN1075402C true CN1075402C (en) | 2001-11-28 |
Family
ID=14928903
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94105833A Expired - Lifetime CN1068252C (en) | 1993-05-27 | 1994-05-25 | On-line roll grinding apparatus |
| CN98106475A Expired - Lifetime CN1075402C (en) | 1993-05-27 | 1998-04-10 | On-line roll grinding apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94105833A Expired - Lifetime CN1068252C (en) | 1993-05-27 | 1994-05-25 | On-line roll grinding apparatus |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3022702B2 (en) |
| KR (1) | KR100323210B1 (en) |
| CN (2) | CN1068252C (en) |
| TW (1) | TW268907B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100891807B1 (en) * | 2002-11-14 | 2009-04-07 | 주식회사 포스코 | Apparatus for detecting fault |
| JP5052790B2 (en) * | 2003-11-19 | 2012-10-17 | 日本碍子株式会社 | Grinding method |
| JP4447440B2 (en) * | 2004-12-02 | 2010-04-07 | 新日本製鐵株式会社 | Online grinding method for work rolls |
| CN101879525B (en) * | 2009-05-07 | 2012-06-13 | 鞍钢股份有限公司 | Method for improving online roll grinding rate of finishing mill |
| CN102001042B (en) * | 2010-09-27 | 2012-12-26 | 清华大学 | High-speed strong-force snagging machine tool multispindle synergic mixed hydraulic control system and control method |
| KR101388034B1 (en) | 2012-05-31 | 2014-04-22 | 현대제철 주식회사 | Grinding machine for pinch roll |
| CN104325370B (en) * | 2014-10-29 | 2018-11-06 | 宝鸡市腾鑫钛业有限公司 | A kind of broad titanium plate strips off the skin polishing machine |
| CN105150036B (en) * | 2015-10-09 | 2017-12-19 | 河北工业大学 | A kind of grinding carriage mobile battery pole piece roll grinder |
| CN105382641B (en) * | 2015-12-14 | 2018-06-22 | 华辰精密装备（昆山）股份有限公司 | Roll workpiece surface is ground and polishing all-in-one machine |
| CN105563251A (en) * | 2016-03-08 | 2016-05-11 | 四川省川磨岷机联合数控机器股份有限公司 | Grinding device for rollers |
| CN107081671B (en) * | 2017-06-28 | 2023-07-04 | 青岛云路先进材料技术股份有限公司 | Online polishing device |
| CN109249311B (en) * | 2018-10-15 | 2020-06-05 | 东北大学 | Electric control roller vibration damper with improved inertia capacity |
| CN111376140B (en) * | 2020-03-20 | 2021-03-23 | 南京林业大学 | Furniture processing is with cutting integrative device of polishing |
| CN113603341B (en) * | 2021-07-23 | 2022-11-08 | 彩虹（合肥）液晶玻璃有限公司 | Online use repairing device for short roller boss |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047241A (en) * | 1989-05-19 | 1990-11-28 | 三菱重工业株式会社 | The method for grinding of roll |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60184411A (en) * | 1984-03-05 | 1985-09-19 | Nippon Steel Corp | Roll grinding device in rolling installation |
| JPS61242711A (en) * | 1985-04-18 | 1986-10-29 | Mitsubishi Heavy Ind Ltd | Roll grinding method |
-
1993
- 1993-05-27 JP JP5126189A patent/JP3022702B2/en not_active Expired - Fee Related
-
1994
- 1994-05-10 KR KR1019940010169A patent/KR100323210B1/en not_active IP Right Cessation
- 1994-05-24 TW TW83104697A patent/TW268907B/zh not_active IP Right Cessation
- 1994-05-25 CN CN94105833A patent/CN1068252C/en not_active Expired - Lifetime
-
1998
- 1998-04-10 CN CN98106475A patent/CN1075402C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047241A (en) * | 1989-05-19 | 1990-11-28 | 三菱重工业株式会社 | The method for grinding of roll |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1205256A (en) | 1999-01-20 |
| CN1102603A (en) | 1995-05-17 |
| JP3022702B2 (en) | 2000-03-21 |
| JPH06335716A (en) | 1994-12-06 |
| CN1068252C (en) | 2001-07-11 |
| KR100323210B1 (en) | 2002-08-09 |
| TW268907B (en) | 1996-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1075402C (en) | On-line roll grinding apparatus | |
| CN1284651C (en) | Centerless grinding apparatus and centerless grinding process | |
| CN111451882B (en) | Five-axis numerical control grinding machine | |
| CN106141919B (en) | Grinding wheel clamping mechanism and the wheel dresser for using the clamping mechanism | |
| CN112726305A (en) | Accurate grinding device in railway rails surface | |
| CN101468444A (en) | Lumber sanding grinder | |
| GB2126504A (en) | Apparatus for transmitting motion to work-supporting tables of machine tools and the like | |
| CN201952693U (en) | Site polisher for welding line at bottom of steel rail | |
| CN111283547A (en) | Steel ball lapping machine | |
| CN1499231A (en) | Appts. for and method of maching of optical connector end | |
| CN212145956U (en) | Steel ball lapping machine | |
| CN110814909B (en) | Shaft deburring device | |
| CN204325828U (en) | A kind of orbital sander | |
| CN112192417A (en) | Four-axis NC mirror surface longitudinal polishing machine | |
| CN110000661B (en) | Bearing inner and outer ring rollaway nest and inner ring internal diameter grinding equipment | |
| CN104404846B (en) | Rail grinding machine | |
| CN218964880U (en) | Portal grinder convenient to unloading | |
| CN105856055A (en) | Lapping method of three-lobe wave bearing raceway | |
| JP3368497B2 (en) | Multi-axis horizontal polishing machine | |
| KR20130092427A (en) | Polishing device for polishing a metal product | |
| KR102375422B1 (en) | Grinding apparatus for roll type work | |
| CN213053978U (en) | Feeding device of lead screw centerless grinding machine | |
| CN108098464B (en) | Wood grinding and polishing method | |
| CN112440193A (en) | Piano type plane sander | |
| CN217493669U (en) | Numerical control planogrinder Z axle construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140525 Granted publication date: 20011128 |