JP3491357B2 - Online roll grinding equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-line roll grinding machine used for grinding work rolls of a rolling mill online in a housing.

[0002]

2. Description of the Related Art In a rolling mill, a step is generated on the surface of a work roll at the boundary between a threaded part and a non-threaded part due to local wear of only the threaded part in contact with the plate. Since it will adversely affect the surface quality of the board and the board profile, in order to obtain a product with a normal board thickness in the board width direction,
Program rolling is generally performed in which the rolling sequence is changed from wide to narrow.
However, such a restriction on the rolling order due to the strip width is a factor that hinders improvement in productivity.

Therefore, as a measure for enabling so-called schedule-free rolling in which rolling can be performed in any order without the rolling order being restricted by the strip width, work with the work rolls incorporated in the housing is performed. On-line grinding for grinding the surface of rolls has become popular.

A conventional online roll grinding apparatus for performing the above-mentioned online grinding supports upper and lower work rolls a (only one is shown in the drawing) and the upper and lower work rolls a, as shown in FIG. In a rolling mill having upper and lower retaining rolls (not shown), a retract guide extending in the rolling line 1 direction is provided on an opposing surface portion inside the housing b located on the driving side and the working side and on the entry side of the working roll a. c is symmetrically arranged and fixed, and a retract beam d extending parallel to the axis of the work roll a is engaged and disposed between the retract guides c.
The rod end of the retracting cylinder f, which is arranged along the rolling line 1 and is installed on the fixed beam e, is connected to the rear side of the rolling line l, and on the retract beam d is parallel to the roll axis direction. A guide rail g is provided, and a support base h capable of moving laterally in a direction parallel to the roll axis is placed on the guide rail g, and the rear side surface of the support base h and the retract beam d. A traverse cylinder i arranged in the roll axis direction is interposed between the front side surface portion and the traverse cylinder i so that the support base h can move laterally along the guide rail g by the expansion and contraction operation of the traverse cylinder i. Further, a plurality of grinders k each having a cylindrical grindstone j attached to the tip end thereof are mounted on the support base h at a required interval in the axial direction of the roll, and the surface of the rotating work roll a. Against Grinding machine k by an unillustrated pushing device
While pressing the grindstone j, the grinding machine k is moved along the roll axis along with the support h by the expansion and contraction operation of the traverse cylinder i so that the surface of the work roll a can be ground online. (Japanese Patent Laid-Open No. 4-284908).

[0005]

However, in the above-described conventional online roll grinding apparatus, when the grindstone j is replaced, the retract beam f is moved along the retract guide c by the operation of the retract cylinder f. As a result, the grinder k assembled to the support h is retracted so as to be separated from the work roll a. However, when the lower work roll a is targeted, the grinding machine k is retracted from the entrance side guide (not shown). Due to the conflict, there is a problem that maintenance is hindered. That is, since a side guide for guiding the rolled material between the upper and lower work rolls a is usually provided on the entrance side of the upper and lower work rolls a,
Since the online roll grinding device for the lower work roll is arranged below the side guide, therefore, during the maintenance, the retract operation of the side guide and the retract operation of the grinding device must be performed, and the operation is complicated. Therefore, there is a problem that maintenance is hindered.

Therefore, the present invention is intended to facilitate maintenance such as exchanging a grindstone in an online roll grinding apparatus for lower work rolls.

[0007]

The present invention solves the above problems.
In order to decide, retract on the entrance side of the upper and lower work rolls.
Side girder that can be moved in the rolling line direction by the device
Of the above side guide in the rolling mill equipped with id
In the void formed under the front end,Between rolling mill housings
To reachA guide beam extending parallel to the roll axis
Place the guide beamRear wall ofThe above side guide
Fixed to a support beam for supporting the guide beam
And traverse in the direction along the roll axis with a traverse device.
Movementto be able to doSupport the base plate,
rateFront end ofSupport so that it projects to the side of the lower work roll.
Attach the holding plate and mount it on the support plate.
LaemBy pressing hydraulic cylinderProximity to lower work roll
The mount frame is arranged so as to be movable in the direction of separation.Up
A cup-shaped grindstoneIt can be rotated by the drive
Sea urchinAssemble the equipped grinding machineWith the gantry frame
The grinding machine can be moved in the direction of moving closer to and away from the lower work roll.
DidThe configuration.

Further, the upper and lower side guides of a rolling mill provided with side guides which can be moved in the rolling line direction by a retractor on the entrance sides of the upper and lower work rolls extend parallel to the roll axis. guide beam of
Both ends are movably installed along the retract guide installed inside the rolling mill housing in the direction of approaching and separating from the upper work roll, and on the guide beam in the direction along the roll axis by the traverse device. You can move sideways
It is supported urchin base plate, prior to the base plate
The end portion, is attached to the support plate so as to project to the upper work roll side, to the support plate, the mount frame press
It arranged to be movable in the direction close to and away from the upper work roll by the hydraulic cylinder with, on the cross-table frame, by assembling grinding machine having to be rotated a grindstone of the cup-type by the drive unit, rack frame With a grinder
It is configured so that it can move in the direction in which it approaches and separates from the work roll .

Further, the retort is attached to the entrance side of the upper and lower work rolls.
Sig-
The above-mentioned side guide in a rolling mill equipped with a guide
Guide beam that extends parallel to the roll axis
Both ends ofIs installed inside the rolling mill housing.
Direction to move closer to and away from the upper work roll along the guide
And the front end of the above side guide.
In the void formed on the lower side of the part,Reaching between rolling mill housings
To doPlaced a guide beam extending parallel to the roll axis
And the guide beamRear wall ofSupport the above side guide
It is fixed to the supporting beam to be held and the upper and lower guide bars
To the direction along the roll axis by the traverse device.
Lateral movementto be able to doEach base plate is supported
Put the upper and lower base plates on the upper and lower work roll sides.
Attach the support plate so that it overhangs, and
A pedestal frame on the support plateHydraulic cylinder for pressing
ByIt is possible to move in the direction of approaching and separating from the upper work roll,
Also, mount the frame on the lower support plate.Pressing oil
By pressure cylinderMove in the direction of moving closer to and away from the lower work roll
Each movably arranged frame frame above and below the frameUp
A cup-shaped grindstoneIt can be rotated by the drive
Sea urchinAssemble the equipped grinding machineAttach it to each frame
Move the grinder to a direction in which it moves closer to and away from the upper and lower work rolls.
I was able to moveThe configuration.

Furthermore, a traverse device is attached to the rack so that it extends over the entire length of a guide beam extending parallel to the roll axis direction, and a pinion meshed with the rack.
A servo motor so as to drive the pinion installed on the base plate, cotton the entire length of the guide beam
It is preferable that the guide rail has a V groove provided in this way, and a guide roller that is rotatably attached to the base plate in a tapered shape corresponding to the V groove of the guide rail.

[0011]

[Operation] When the lower work roll is targeted, since the guide beam is fixed to the support beam of the side guide,
When the side guide is retracted by the retractor for the side guide, the entire device can be moved integrally with the side guide.

Further, when the upper work roll is installed as a target, since it is located above the side guide, the entire work can be retracted without interfering with the side guide.

Further, when the upper and lower work rolls are installed, the upper and lower work rolls can be ground at the same time.

Furthermore, if a guide mechanism comprising a guide rail having a V groove and a guide roller having a shape matching the V groove is adopted in the traverse device, rattling in the front-back and up-down directions of the grinder during roll grinding can be suppressed. be able to.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention, in which a housing 3 is provided with upper and lower work rolls 1a and 1b and upper and lower work rolls 2a and 2b which support the upper and lower work rolls 1a and 1b. The upper and lower work rolls 1a, 1b on the entry side of the upper and lower work rolls 1a, 1b.
Left and right side guides 4 for guiding the rolled material between 1b
And a support beam 5 that supports the left and right side guides 4 so that they can move toward and away from each other in the axial direction of the roll, and a retracting cylinder 6 as a retracting device.
Is connected, and the side guide 4 is moved integrally with the support beam 5 in the rolling line L direction by the expansion and contraction operation of the retracting cylinder 6. Of the online roll grinding machine for the rolling line L together with the side guide 4
Equip it so that it can move in any direction.

More specifically, in the space 17 formed below the front end of the side guide 4, an elongated guide beam 7 having a U-shaped cross section is formed parallel to the axial direction of the roll so as to reach between the housings 3. Place it downwards so that
The rear side wall (upstream side wall in the rolling line direction) is fixed to the support beam 5. At least two (two in the embodiment) base plates 8 are arranged below the guide beam 7 at intervals narrower than half the length of the body length of the work roll 1b. Guide rollers 9 having a double tapered shape such as abacus balls are rotatably attached to the left and right four corners through a vertical axis 10, and the guide beams 7 are provided at positions facing the inner side surfaces of the front and rear side walls. A guide rail 11 having a V groove that matches the roller 9 is provided over the entire length, and the guide roller 9 is attached to the guide rail 11.
To suspend and support the base plate 8, and to attach the rack 13 to the lower side surface of the central portion of the guide beam 7 through an appropriate attaching member 12 over the entire length of the guide beam 7, The output shaft of the servo motor 15 installed upward on the lower surface is projected to the upper surface side of the base plate 8 to attach the pinion 14,
By engaging the pinion 14 with the rack 13, a traverse device 16 is constituted by the servo motor 15, the pinion 14, the rack 13, the guide roller 9 and the guide rail 11, and the traverse device 16 causes the base plate 8 to move in the roll axial direction. Allows lateral movement in a direction parallel to.

A supporting plate 29 is attached to the front end portion of each of the base plates 8 so as to project toward the lower work roll 1b, and the support plate 29 is provided on the support plate 29 and in proximity to the lower work roll 1b. The gantry frame 19 is arranged so as to be movable in the separating direction, and the bracket 31 protruding from the lower surface of the front end of the gantry frame 19 is attached to the bracket 31 by a rod of a pressing hydraulic cylinder 33 as a pressing device installed on the support plate 29. The grinder 18 having the cup-shaped grindstone 24 at the front end is assembled on the gantry frame 19 by connecting the tip portions thereof, and the pressing hydraulic cylinder 33 is mounted.
By the expansion and contraction operation, the grinder 18 is moved together with the gantry frame 19 in a direction of approaching and separating from the lower work roll 1b so that the grindstone 24 at the front end is pressed against the surface of the lower work roll 1b.

As shown in detail in FIGS. 3 and 4, the grinding machine 18 mounts a casing 20 extending in the left-right direction, which is the axial direction of the roll, on a gantry frame 19, and the casing 20. The front and rear end portions of the output shaft 21 are rotatably supported by the bearing 22 by penetrating the side wall portions 20a and 20b at one end portion side in the left and right direction inside, and the front and rear end portions of the rotary shaft 25 are provided at the other end side. Side walls 20a, 20b
Is rotatably supported by a bearing 26, and the output shaft 21 is connected to a drive motor 23 as a drive device attached to the rear end surface of the casing 20,
A cup-shaped (one-tapered) grindstone 24 is attached to the front end (tip) of the rotary shaft 25.
3 of the output shaft 21 and the rotary shaft 25 of the belt pulley 2
7 is attached, an endless belt 28 is wound around both belt pulleys 27, and the driving force of the motor 23 is transmitted from the output shaft 21 to the rotary shaft 25 via the belt 28 to rotate the grindstone 24. I am allowed to do so.

Further, the grinder 18 has a casing 20.
At the center of the front end of the bottom plate portion 20c, a bracket 30 is provided so as to project forward, and the bracket 30 is supported by the support pins 32 arranged in the vertical direction.
The bottom plate 2 of the casing 20 which is pivotally attached to the front end of the casing 20.
The four corners of 0c are engaged and held by the guide member 34 provided on the gantry frame 19, and the entire grinding machine 18 can be tilted to the left and right on the gantry frame 19 with the support pin 32 at the front end as a fulcrum. The inclination angle can be fixed by a non-fixing means.

When the lower work roll 1b is ground, the gantry frame 1 is extended by the extension operation of the pressing hydraulic cylinder 33.
9, the grinder 18 is advanced to press the grindstone 24 against the surface of the rotating lower work roll 1b, and in this state, the rotational force of the drive motor 23 is transmitted from the output shaft 21 via the belt 28 to the rotary shaft 25. Tell the whetstone 2
While rotating 4, the base plate 8 is moved laterally by the traverse device 16 in parallel with the roll axis. At this time, in the traverse device 16, the servo motor 1
The lateral movement force is obtained by rotating the pinion 14 meshed with the rack 13 by the drive of No. 5, but this lateral movement is caused by the guide rail 11 having a V groove as a guide mechanism and the guide rail. Since it is guided by the guide rollers 9 having both taper shapes that engage with 11,
The grinder 18 can be laterally moved stably without causing rattling in the front-rear direction and the vertical direction.

In the above, for example, when maintenance such as replacement of the grindstone 24 becomes necessary, the retracting cylinder 6 of the side guide 4 is actuated to separate it from the lower work roll 1b. That is, normally
When performing maintenance of the online roll grinding device, the retract of the side guide and the retract of the grinding device are required as separate operations, but in the present invention, the guide beam 7 is fixed to the support beam 5 for the side guide 4. Therefore, the retracting cylinder 6 of the side guide 4 can be operated to retract integrally with the side guide 4. Therefore, a retract device dedicated to the online roll grinding device and its operation are unnecessary, and maintenance can be easily performed.

Next, FIG. 5 shows an embodiment of an online roll grinding apparatus of the present invention for grinding the upper work roll 1a. The online roll for grinding the lower work roll 1b shown in the above embodiment. The guide beam 7 and the traverse device 16 in the grinding device are arranged in the upside-down direction above the side guides 4,
A retract guide in which both ends of a guide beam 7'extending in the roll axis direction as the above-mentioned guide beam 7 are obliquely attached to the inner facing surfaces of the left and right rolling mill housings 3 so as not to interfere with the upper ends of the side guides 4. A retracting cylinder 36 as a dedicated retracting device is provided so as to be movably engaged with and supported by the upper work roll 1a along a line 35 and directly connected to the guide beam 7 '. A support plate 29 is attached to the front end portion so as to project toward the upper work roll 1a side, and a pressing hydraulic cylinder 33 is mounted on the support plate 29.
The gantry frame 19 is arranged so that it can move toward and away from the upper work roll 1a by the expansion and contraction operation of the above, and a grinder having the same configuration as that shown in FIGS. 3 and 4 is provided on the gantry frame 19. 18 is installed.

In the embodiment shown in FIG. 5, a dedicated retract cylinder 36 is required, but since the entire cylinder 36 is located above the side guide 4, it can be placed along the retract guide 35 without interfering with the side guide 4. The traverse device 16 can be retracted, and the guide mechanism including the guide rail 11 having a V groove and the guide rollers 9 having both taper shapes is adopted in the traverse device 16, so that rattling of the grinder 18 at the time of online grinding can be prevented. As in the above embodiment, there is an advantage that it can be suppressed stably. Further, when installed for the upper work roll 1a, the guide beam 7'is exposed upward, but even in this case, since the engaging portion of the guide roller 9 with the guide rail 11 is covered by the base plate 8, No grinding dust adheres to the vicinity of the guide roller 9.

Further, FIG. 6 shows the upper and lower work rolls 1a,
1B shows an embodiment of an online roll grinding apparatus of the present invention for grinding 1b. For the grinding of the upper work roll 1a, the same construction as that of the roll grinding apparatus shown in FIG. The structure of the roll grinding apparatus shown in FIG. 1 is adopted for grinding the roll 1b.

In the case of the embodiment shown in FIG. 6, the upper and lower work rolls 1a and 1b can be stably and simultaneously ground.

In the above embodiment, since the grindstone 24 of the grinder 18 is of cup type, the grindstone 24 is abutted obliquely on the surface of the work roll 1b as shown in FIG. Although the case where the machine 18 is obliquely arranged and set is shown, in order to adjust the tilt angle of the grinding machine 18, a dedicated tilting device may be installed on the gantry frame 19, and other aspects of the present invention. Of course, various changes can be made without departing from the scope of the invention.

[0028]

As described above, according to the on-line roll grinding apparatus of the present invention, the following excellent effects are exhibited. (1) on the entrance side of the upper and lower work rolls, in a void formed below the front end of the side guide in a rolling mill equipped with a side guide movable in the rolling line direction by a retractor, Arrange a guide beam extending parallel to the roll axis to reach between the rolling mill housings,
A rear side wall of the guide beam is fixed to a support beam that supports the side guide, and a base plate is supported by the guide beam so as to be laterally movable in a direction along a roll axis by a traverse device, and a front end portion of the base plate is supported. To the lower work roll side, a support plate is attached to the lower work roll side, and a pedestal frame is movably arranged on the support plate by a pressing hydraulic cylinder so as to be movable toward and away from the lower work roll. Since a grinding machine equipped with a cup-shaped grindstone so that it can be rotated by a drive unit is assembled on the top, the grinding machine can be moved together with the gantry frame in the direction of moving toward and away from the lower work roll. By retracting the guide with a retractor, the guide beam and the traverse to the guide beam The base plate supported by the device so as to be able to move laterally and the grinder on the support plate attached to the base plate can be integrally retracted in the direction of the rolling line, and therefore maintenance for exchanging the grindstone of the grinder is performed. Can be done easily. (2) on the entrance side of the upper and lower work rolls, in the upper part of the side guide in a rolling mill equipped with a side guide movable in the rolling line direction by a retractor,
Both ends of the guide beam extending parallel to the roll axis are installed so as to be movable in a direction of approaching and separating from the upper work roll along a retract guide installed inside the rolling mill housing, and on the guide beam, A base plate is supported by a traverse device so that it can move laterally in the direction of the roll axis, and a support plate is attached to the front end of the base plate so as to project to the upper work roll side. Is arranged so as to be movable in a direction of approaching and separating from the upper work roll by a pressing hydraulic cylinder, and a grinder equipped with a cup-shaped grindstone that can be rotated by a drive device is mounted on the gantry frame, Since the grinder can be moved together with the frame in the direction of moving toward and away from the upper work roll, When the base plate is supported by the guide beam to allow lateral movement by the traverse device, the grinding machine on the support plate attached to the base plate can be retracted without interfering with side guides together. (3) on the entrance side of the upper and lower work rolls, in the upper part of the side guide in the rolling mill equipped with a side guide movable in the rolling line direction by the retractor,
Both ends of the guide beam extending parallel to the roll axis are installed along the retract guide installed inside the rolling mill housing so as to be movable toward and away from the upper work roll, and the front end of the side guide is also installed. A guide beam extending parallel to the roll axis so as to reach between the rolling mill housings is arranged in a space formed on the lower side of the rolling mill, and the rear side wall of the guide beam is fixed to a support beam that supports the side guide. And, each of the upper and lower guide beams is made to support a base plate so as to be laterally movable in a direction along the roll axis by a traverse device, and the upper and lower base plates are supported so as to project to the upper and lower work roll sides. On the upper support plate, the gantry frame is moved close to and away from the upper work roll by the pressing hydraulic cylinder. Movably, and on the lower support plate, a gantry frame is arranged by a pressing hydraulic cylinder so that the gantry frame can move toward and away from the lower work roll, and on each of the upper and lower gantry frames, Since a grinder equipped with a cup-shaped grindstone that can be rotated by a drive device is assembled, the grinder can be moved together with each of the gantry frames in a direction of approaching and separating from the upper and lower work rolls. The work rolls can be simultaneously and stably ground. (4) The traverse device is mounted on the rack so as to extend over the entire length of the guide beam extending parallel to the roll axis direction, the pinion meshed with the rack, and the servo installed on the base plate to drive the pinion. Since the motor, the guide rail having the V groove provided over the entire length of the guide beam, and the guide roller rotatably attached to the base plate in the shape of both tapers corresponding to the V groove of the guide rail, are configured.
It is possible to stably suppress rattling in the front-back and up-down directions during roll grinding of the grinder.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an online roll grinding apparatus of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is an enlarged side view of the grinder.

FIG. 4 is a sectional plan view of FIG.

FIG. 5 is a side view showing another embodiment of the present invention.

FIG. 6 is a side view showing still another embodiment of the present invention.

FIG. 7 is a schematic plan view showing an example of a conventional online roll grinding apparatus.

[Explanation of symbols]

1a, 1b Work roll 3 Housing 4 Side guide 5 Support beam 6 Retracting cylinder (Retract device) 7, 7'Guide beam 8 Base plate 9 Guide roller 11 Guide rail 13 Rack 14 Pinion 15 Servo motor 16 Traverse device 17 Void 18 Grinding Machine 19 Frame 23 Drive motor (drive device) 24 Grinding stone 29 Support plate 33 Hydraulic cylinder for pressing 35 Retract guide L Rolling line

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-190410 (JP, A) JP-A-6-297325 (JP, A) Actually open 2-70805 (JP, U) Actually open 5- 5203 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 28/04 B24B 5/37

Claims (4)

(57) [Claims] 1. A retract is provided on the entrance side of the upper and lower work rolls.
Side girder that can be moved in the rolling line direction by the device
Of the above side guide in the rolling mill equipped with id
In the void formed under the front end,Between rolling mill housings
To reachA guide beam extending parallel to the roll axis
Place the guide beamRear wall ofThe above side guide
Fixed to a support beam for supporting the guide beam
And traverse in the direction along the roll axis with a traverse device.
Movementto be able to doSupport the base plate,
rateFront end ofSupport so that it projects to the side of the lower work roll.
Attach the holding plate and mount it on the support plate.
LaemBy pressing hydraulic cylinderProximity to lower work roll
The mount frame is arranged so as to be movable in the direction of separation.Up
A cup-shaped grindstoneIt can be rotated by the drive
Sea urchinAssemble the equipped grinding machineWith the gantry frame
The grinding machine can be moved in the direction of moving closer to and away from the lower work roll.
DidAn online system characterized by having a configuration
Grinding machine. 2. A rolling mill equipped with side guides that are movable in the rolling line direction by a retractor on the entrance sides of the upper and lower work rolls and extends parallel to the roll axis above the side guides. Both guide beams
The end part is installed so as to be movable along the retract guide installed inside the rolling mill housing in the direction of approaching and separating from the upper work roll, and on the guide beam in the direction along the roll axis by the traverse device. To be able to move laterally
To support the base plate, the front end of the base plate
Part , attach a support plate so that it projects to the upper work roll side, and press the gantry frame onto the support plate.
Arranged to be movable in the direction close to and away from the upper work rolls by use hydraulic cylinders, on the cross-table frame, a grinding wheel of the cup type assembled grinding machine having to be rotated by the drive unit, together with the gantry frame Working on grinder
An online roll grinding apparatus having a structure capable of moving in a direction of approaching and separating from a roll. 3. An upper side of the side guide of a rolling mill, which is equipped with side guides that can be moved in the rolling line direction by a retractor on the entrance sides of the upper and lower work rolls, extends parallel to the roll axis. Both guide beams
Install the end part along the retract guide installed inside the rolling mill housing so that it can move toward and away from the upper work roll, and in the space formed below the front end part of the side guide. Reach between rolling mill housings
The guide beam extending parallel to the roll axis is fixed, the rear side wall of the guide beam is fixed to the support beam that supports the side guide, and the upper and lower guide beams are attached to the roll axis by the traverse device. Support each base plate so that it can move laterally,
A support plate is attached to each of the upper and lower base plates so as to project toward the upper and lower work rolls, and a gantry frame is mounted on the upper support plate by a hydraulic cylinder for pressing.
It is possible to move in the direction of approaching and separating from the lifting work roll, and
On the lower support plate, attach the frame to the hydraulic system for pressing.
Respectively arranged to be movable in the direction close to and away from the lower work roll by Linda, on each rack frame under the upper, the grinding machine example Bei <br/> to be rotated by the cup-shaped drive device grindstone put sets, Ken along with the respective frame frame
The milling machine can be moved in the direction in which it moves closer to and away from the upper and lower work rolls.
An online roll grinding apparatus having the above-mentioned configuration. 4. The traverse device is flat in the axial direction of the roll.
A rack attached to span the entire length of the guide beam extending in the row, the pinion is meshed with the rack, the servo motor so as to drive the pinion installed on the base plate, the guide beam set over the entire length of the <br /> A guide rail having a V-shaped groove and a V of the guide rail
4. The online roll grinding apparatus according to claim 1, wherein the online roll grinding apparatus comprises a guide roller rotatably attached to the base plate as a taper shape corresponding to the groove.