JP2005238423A - On-line defect removing device of metallic steel strip and its defect removing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely grind a defect part while absorbing a variation in a carrying level of a metallic steel plate fed at a high speed. <P>SOLUTION: This on-line defect removing device has defect detecting devices 12a and 12b for detecting a defect caused in a metallic steel strip 1a fed in a plate feeding line, and grinding attachments 14a and 14b arranged in a downstream side line of the defect detecting devices of the plate feeding line and grinding the defect on the basis of defect detecting information including a defect position detected by the defect detecting devices. In the on-line defect removing device of the metallic steel strip, these grinding attachments are provided with a traverse driving frame 25 for traversing in the width direction of the metallic steel strip fed in the plate feeding line, a longitudinal advance driving frame 29 installed in this traverse driving frame and longitudinally advancing toward a defect surface of the metallic steel strip, and grinding wheels 32a and 32b installed in the plate feeding line direction of this longitudinal advance driving frame and arranged in fluid actuators 30a and 30b capable of respectively independently adjusting pressing force. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an on-line defect removal apparatus for a metal steel strip that removes surface defects that occur on the surface of a metal steel strip that passes through a plate passing line and surface layer defects that are manifested in a lower process, and a method for removing the defect.

  Conventionally, the following two defect removal methods have been proposed as techniques for removing defects (defects) generated in a metal steel strip to be passed through.

  One defect removal method includes a payoff reel 102 around which a metal steel strip 101 is wound and a tension reel 103 that winds the metal steel strip 101 from the payoff reel 102 with a predetermined tension as shown in FIG. A plurality of grinding stands, that is, a grinding stand group 104, are arranged between the reels 102 and 103 in the plate line direction and the steel plate width direction, respectively, and a wrinkle detection device (see FIG. (Not shown) is arranged.

  When this wrinkle detecting device detects the wrinkle position of the metal steel plate 101 to be passed at high speed, the wrinkle roll 110 shown in FIG. 6 constitutes one grind stand in the grinding stand group 104 corresponding to this wrinkle position. This is a method of tracking a position and grinding a defect flaw generated in the metal steel strip 101 by a grinding belt 111 (Patent Document 1).

  5 and 6, 105 is a wiper for removing grinding scraps remaining on the surface of the metal steel strip, 112 is a breaker roll, 113 is a contact roll on which a grinding belt 111 fed from the bride roll 110 is stretched, 114 is A billy roll that faces the contact roll 113 and enables grinding by the grinding belt 111 that is stretched over the contact roll 113 while applying a required tension to the metal steel band 101, and 115 is a smooth grinding of the metal steel band 101. It is a grinding oil supplied for the purpose.

  According to this defect removal method, the wrinkle detection device confirms whether the wrinkle detection position of the metal steel plate 101 is clear or unclear, and individually selects from the grinding stand group 104 arranged over the plate passing line direction and the steel plate width direction. The grinding stand can be used properly, and the grinding ability is ensured by rotating the grinding belt 111 of each grinding stand in the direction opposite to the plate line direction. In addition, by using the grinding belt 111, if the wrinkle position in the steel plate width direction is unclear, it can be ground with a grinding stand arranged in the full plate width, while the wrinkle position in the steel plate width direction is clear. States that one applicable grinding stand can be selected to grind defect defects.

  Another defect removal method is as shown in FIG. 7, as shown in FIG. 7, a flaw detection device 123, in order from the feeding end 121 side, to a through plate line that winds the metal steel strip 101 fed from the feeding end 121 at the winding end 122. When the cutting device 124 and the rolling mill equipment 125 are arranged and the wrinkle detection device 123 detects wrinkles generated on the surface of the metal steel strip 101, the cutting device 124 cuts and removes the surface wrinkles, and then the rolling mill equipment 125 It is the structure rolled and wound up by the winding end 122 (patent document 2). Reference numeral 126 denotes a support roll, and 127 denotes a magnetic processing apparatus.

  The cutting device 124 is configured as shown in FIGS. 8 is a side view, and FIG. 9 is a top view as seen from the direction of arrow B shown in FIG. That is, in the cutting device 124, the traversing guide 131 and the traversing ball screw 132 are juxtaposed so as to straddle the width direction of the metal steel plate 101, and the traversing ball screw 132 rotates as the traversing motor 133 is driven. . Further, the support base 134 is engaged with the traverse guide 131 and the traverse ball screw 132, and when the traverse ball screw 132 rotates as the traverse motor 133 is driven, the support base 134 moves in the steel plate width direction. . A lifting ball screw 136 and a lifting guide 137 that are rotated by driving of a lifting motor 135 are arranged side by side on the surface of the support base 134 facing the steel plate, and a tool that engages with the ball screw 136 and the lifting guide 137. The processing tool 139 is attached to the support base 138, the processing tool 139 supported by the support base 134 is lowered to start cutting, and the processing tool 139 is raised after passing the scissors portion to complete the scissor cutting processing.

According to this defect removal method, by using cutting for wrinkle removal and processing only the wrinkle, deep cutting such as a bald wrinkle is possible, the processing resistance is greatly reduced, and the steel sheet breaks. It should be possible to process without generating. Further, when the moving speed of the steel plate 101 is low, by applying ultrasonic cutting, the machining resistance is further reduced, the rigidity of the entire cutting device 124 is reduced, the work tool support system can be reduced, and the equipment cost is reduced. It is stated that it contributes to reduction.
Japanese Patent Laid-Open No. 06-246326 JP 2001-191206 A

  However, in the defect removal method according to Patent Document 1 as described above, since the defect flaw of the metal steel plate 101 is ground by the grinding belt 111, the grinding force is very small, and an appropriate depth and roughness are taken into consideration while taking the lower process into consideration. It is difficult to grind with. In addition, since the grinding force is small, it is necessary to install a large number of grinding stand groups, and a large number of grinding belts 111 in the plate feed line direction and the steel plate width direction, which causes a problem that the equipment space of the grinding apparatus becomes excessive. is there. Further, since a large number of grinding belts 111 are installed, there is a problem that the individual selection control of each grinding belt 111 becomes complicated.

  On the other hand, in the defect removal method according to Patent Document 2, as in Patent Document 1, the cutting depth and the cutting of the defect flaw portion of the metal steel strip 101 are taken into consideration while considering the types of defects generated in the metal steel strip 101 and the processing of the lower process. There is a problem that it is difficult to adjust the roughness. In general, when the metal steel strip 101 is transported, the transport level fluctuation is not negligible compared to the defect removal depth. However, in the depth control using the lifting ball screw 136, the optimal depth control is performed. Difficult, for example, when the surface of the metal steel strip 101 rises greatly during conveyance, this results in excessive cutting, and there is a problem that the trace of the defect removal portion remains even after rolling, and the quality of the product is greatly reduced.

  The present invention has been made in view of the above circumstances, and provides an on-line defect removal apparatus for a metal steel strip and a defect removal method thereof for grinding a certain defective portion while absorbing fluctuations in the conveyance level of a metal steel sheet to be passed at high speed. The purpose is to do.

  Another object of the present invention is to provide an on-line defect removal device for a metal steel strip that enables adjustment of the defect removal depth and roughness so that no trace of the defect removal portion remains after the pretreatment process.

(1) In order to solve the above-mentioned problem, the on-line defect removal apparatus for metal steel strips according to the present invention eliminates defects that occur on the surface of metal steel strips that pass through plate-passing lines and defects that are manifested in lower processes. A defect detection device for detecting, and a grinding device for grinding the defect on the basis of defect detection information including a defect position which is disposed on the downstream side of the defect detection device of the sheet passing line and is detected by the defect detection device. And
The grinding apparatus includes a traverse drive frame that traverses in the width direction of the metal steel strip passing through the sheet passing line, and a forward / backward travel that is attached to the traverse drive frame and moves forward and backward toward a defective surface of the metal steel strip. A drive frame, and a plurality of grinding wheels provided in a fluid actuator that is attached in the plate line direction of the forward / backward drive frame and can independently adjust the pressing force,
Based on the defect detection information including the defect position, positioning in the width direction with the traverse drive frame, and moving forward and backward toward the defect surface with the forward / reverse drive frame, the grinding wheel is made to the defect surface. In this configuration, defects are removed by pressure contact.

  The present invention is configured as described above, so that it is possible not only to position the grinding wheel in contact with the defective surface by the transverse drive frame and the forward / backward drive frame that moves forward and backward, but also to individually detect the defective surface of the grinding wheel with the fluid actuator. Since the pressing force with respect to is adjusted, it is possible to grind a defect with a grinding wheel under an optimal pressing force. In addition, since the fluid actuator individually supports each grinding wheel, it can easily absorb the fluctuation of the conveyance level and does not leave a trace in the lower process due to excessive grinding.

  In addition, if a plurality of grinding wheels arranged in the threading line direction are circular hard wheels, defects can be removed at a required defect grinding depth including the pressing force set by the fluid actuator. It becomes possible.

  Furthermore, in the apparatus of the present invention, among the plurality of grinding wheels disposed in the plate passing line direction, the grinding wheel disposed on the upstream side causes the defect surface to have a required depth by adjusting the fluid pressure of the corresponding fluid actuator. The grinding wheel disposed on the downstream side was defective by grinding the defective surface so as to have the required roughness after processing in the lower process by adjusting the fluid pressure of the corresponding fluid actuator. The metal steel sheet can be passed to the lower process in an optimum state, and can be processed without leaving any trace of defects in the lower process.

(2) The on-line defect removal method for a metal steel strip according to the present invention includes a defect detection step for detecting a defect that occurs on the surface of the metal steel strip that passes through the plate-passing line and a defect that is manifested in a lower process. A tracking processing step for fetching a defect detection signal including a defect position detected in the defect detection step and sending a grinding instruction signal including the defect position at a timing when the defect position reaches a required grinding position, and the defect position When the grinding instruction signal is received, the plurality of grinding wheels arranged in the sheet passing line direction are moved in the transverse direction and the forward / backward direction, and pressed against the defective surface by a fluid actuator that can independently adjust the pressing force. And a defect removal step of removing the defect.

  Also in this defect removal method, the same effect as the online defect removal apparatus for the metal steel strip described in the above item (1) can be obtained.

  The defect removal step includes a grinding setting step for setting the positioning in the forward / backward direction and the pressing force of the fluid actuator, and after setting conditions necessary for grinding by the grinding setting step, the action of the fluid actuator. And a conveyance level fluctuation following step for operating a plurality of grinding wheels so as to follow the conveyance level fluctuation of the metal steel strip, and pressing by setting the fluid actuator while following the conveyance level fluctuation of the metal steel band by this step The grinding wheel can be a grinding process step in which the defective surface is removed by pressing the defective surface with force.

  The present invention relates to an on-line defect removal apparatus for a metal steel strip and a method for removing the defect, which can reliably grind a defect portion while absorbing a conveyance level fluctuation of a metal steel plate to be passed at high speed and can realize a high-quality metal steel strip. Can be provided.

  In addition, the present invention can provide an on-line defect removal apparatus for a metal steel strip capable of adjusting the defect removal depth and roughness so that no trace of the defect removal portion remains after the pretreatment process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an on-line defect removal apparatus for a metal steel strip according to the present invention applied to, for example, a pickling and cold rolling continuous line, for example, when a multistage grinding head type grinding apparatus using a defect removal tool for a grinding wheel is applied. It is a block diagram which shows one Embodiment.

  This pickling cold rolling continuous line is a coiled hot rolled steel sheet 1a produced by hot rolling a thick plate slab having a thickness of about 200 mm by a hot rolling mill to a maximum thickness of about 4 mm in the previous manufacturing process. After the hot-rolled steel sheet 1a fed from the feed end 2 is pickled through a pickling tank 3 which is a pickling process for removing scales generated in the hot rolling process. This is a step of cold rolling by the cold rolling mill group 4 to produce a cold rolled steel sheet 1b having a thickness of about 1 mm, and winding the cold end 5 to produce a cold rolled coil. This cold-rolled coil is moved to the next step according to the shipment type, and subjected to continuous annealing treatment and plating treatment.

  By the way, if the surface defects generated in the steel sheet 1a manufactured in the thick plate slab manufacturing stage or the hot rolling stage remain in the cold rolled coil, the quality of the shipped product depends on the degree of the defects (size, length, etc.). As a result, the production cost increases as a result of increasing the number of processes such as cutting the portion where the wrinkles occur. Generally, most of the wrinkles that occur in the cold rolled coil are generated during the manufacturing process of the thick plate slab and the hot rolling stage, so that the surface layer that is manifested in the surface wrinkles and lower processes in the cold rolling coil manufacturing stage. If a wrinkle is detected and only the detected wrinkle portion is removed by grinding or the like and then cold rolled, it is possible to produce a cold rolled steel sheet 1b having no defects on the steel sheet surface.

  Therefore, in the defect removal apparatus for the metal steel strip according to the present invention, for example, when removing defects during high-speed passing of the hot-rolled steel sheet 1a, it is provided on the front side of the pickling tank 3 which is the pickling process step, Among the plate passing direction changing system for changing the passing plate direction at a predetermined angle at a plurality of different passing plate line positions of the same passing plate line, and the passing plate out of the steel plate surface portion of the passing plate line changed by the passing plate direction changing system. A surface defect or a surface defect appearing on the surface of the steel sheet 1a on the upstream side of the grinding target surface is defined as a steel plate surface part on the downstream side within the predetermined distance range from the direction tip steel plate surface part or the tip steel plate surface part. It is configured by a defect removal processing system that detects surface layer defects that are manifested in a lower process and grinds and removes the defects of the steel sheet 1a on the surface to be ground using a defect removal tool such as a grinding wheel. In addition, the plate direction front steel plate surface portion referred to here is a surface of the metal steel strip in which the plate direction is changed, and the surface portion on which the normal vector has a gravity direction vector component or the gravity direction vector component is It corresponds to any surface portion when 0 is reached.

  As the sheet passing direction changing system, the first turning is performed to change the sheet passing direction of the hot rolled steel sheet 1a fed from the feeding end 2 to 90 degrees or more in the steel sheet passing line on the upstream side of the pickling tank 3. A second (for example, an upper turning roll) 11a and a second rolling direction of the hot-rolled steel sheet 1a passing through the first turning roll 11a are changed to, for example, 90 degrees or more, and guided to the pickling tank 3. A turning roll (for example, a lower-side turning roll) 11b is formed, and a hot-rolled steel sheet 1a is formed to form a through-plate line meandering in a substantially Z-shape, and, for example, substantially the same as the through-plate direction of the upstream through-board line. It is the structure which pays out in the same plate | board direction and supplies to the pickling tank 3. FIG.

  On the other hand, the defect removal processing system is installed so as to face both the upper and lower surfaces of the steel plate 1a on the through plate line located on the upstream side of the first turning roll 11a. The defect detection devices 12a and 12b that detect surface layer defects that are manifested in the above, and the defect position detected by these defect detection devices 12a and 12b are tracked, and based on this tracking information, the corresponding defects in the steel sheet 1a are detected. Hot rolling in which the sheet passing direction is changed by one or a plurality of control computers 13a and 13b that output a grinding instruction signal at the timing when the required position is reached and the turning rolls 11a and 11b. The steel plate 1a has a threading direction tip steel plate surface portion or a steel plate surface portion on the downstream side within a predetermined distance range from the tip steel plate surface portion as a surface to be ground. And grinding apparatuses 14a and 14b for grinding defects generated in the hot-rolled steel sheet 1a based on a grinding instruction signal including a width direction defect position from the control computers 13a and 13b.

  Specifically, the grinding devices 14a and 14b are configured as shown in FIGS. FIG. 2 is a side view of a sheet passing line including grinding devices 14a and 14b, and FIG. 3 is a top view as seen from the direction of arrow A shown in FIG. Since both the grinding apparatuses 14a and 14b have the same configuration, for convenience of explanation, a related configuration including one grinding apparatus, for example, 14a will be described, and the configuration of the other grinding apparatus 14b will be omitted.

  This grinding device 14a is applied to the surface to be ground which is the steel plate surface portion of the hot-rolled steel plate 1a whose hot plate direction has been changed as described above, or the steel plate surface portion on the downstream side within the predetermined distance range from the tip steel plate surface portion. On the other hand, support bases 21L and 21H are provided in the width direction of the steel plate 1a so as to be wider than the width of the steel plate, and a traverse ball screw 22 and a traverse guide 23 are required between the support bases 21L and 21H. They are juxtaposed at intervals. A traverse drive motor 24 rotationally drives the traverse ball screw 22. Further, a traverse drive frame 25 is provided so as to be engaged across the traverse ball screw 22 and the traverse guide 23. Since the traverse drive frame 25 is provided with a screw hole portion that engages with the traverse ball screw 22, the traverse drive motor 24 is driven by the traverse guide 23 as the traverse drive motor 24 rotates. It has a function of traversing in the direction C in the figure by the rotation of 22.

  A forward / reverse positioning drive motor 27 for rotationally driving the forward / backward moving ball screw 26 is attached to one side surface portion in the sheet passing line direction, preferably a side surface portion including a steel plate, of the surface portion of the transverse drive frame 25, and the line direction A forward / rearward travel guide 28 projects from the other end surface side, and a forward / reverse drive frame 29 is installed on the front end side of the forward / rearward movement ball screw 26 and the front end side of the forward / backward travel guide 28. The forward / backward drive frame 29 is formed with a screw hole so as to be screwed with the forward / backward movement ball screw 26 and has a function of moving back and forth in the direction D in the figure while being guided by the forward / backward guide 28. The forward / reverse drive frame 29 functions as an elevating drive frame when the grinding target surface, which is a steel plate surface portion, is an upper and lower surface, and the forward / reverse drive frame and the elevating drive frame are functionally synonymous. The same applies to the gist of the invention.

  Among the surface portions of the forward / reverse drive frame 29, fluid actuators capable of adjusting the pressing force independently to the steel plate side surface portion which is one side surface portion in the plate passing line direction and the steel plate exit surface portion which is the other side surface portion, for example, hydraulic pressure Cylinders 30a and 30b are attached, and grinding heads 31a and 31b are provided on these cylinder arms so that they can follow fluctuations in the conveyance level. That is, a plurality of multi-stage grinding heads 31a and 31b are attached to the forward / reverse drive frame 29 at least in the plate passing line direction, and the role of improving the grinding ability and the function of adjusting the defect removal depth and roughness described later are provided. It is something to give.

  The grinding heads 31a and 31b are provided with disc-like hard grinding wheels 32a and 32b, and the function of the hard grinding wheel 32a corresponding to the side surface portion with steel plate that is one side surface portion in the plate passing line direction is as follows. The function of the hard grinding wheel 32b that has a role of grinding with emphasis on the depth of defect removal by adjusting the pressure of the hydraulic cylinder 30a in advance, and corresponding to the steel plate exit side portion that is the other end side portion. As described above, the pressure of the hydraulic cylinder 30b is made smaller than the pressure of the hydraulic cylinder 30a in advance, and it has the role of achieving the optimum roughness of the steel sheet surface while taking into consideration the processing of the lower process.

  Needless to say, the configuration of the grinding device 14b is the same as the configuration of the grinding device 14a described above.

  Further, of the grinding devices 14a and 14b, chips and abrasive grains generated by grinding of the grinding device 14a fall on the steel plate passing through the second turning roll 11b, so that grinding is performed at a position directly below the grinding device 14a. A chip / abrasive receiving body 33 is provided for receiving chips / abrasive grains that are sometimes generated. The chip / abrasive receiver 33 is provided only when necessary.

Next, the operation of the above-described on-line defect removal apparatus for metal steel strip and the on-line defect removal method for metal steel strip according to the present invention will be described with reference to FIG.
Now, the hot-rolled steel sheet 1a fed out from the feed-out end 2 is pickled by the pickling tank 3 for removing the scale generated in the hot rolling process, and then led to the cold rolling mill group 4. Here, after cold rolling, it is wound up by the winding end 5 side to produce the cold rolled steel sheet 1b. In addition, the on-line defect removal apparatus and the defect removal method according to the present invention can be applied not only to the pickling and cold rolling continuous line, but also to the passing plate line of various steel sheets, and grinding and removing defects generated in the steel sheets. Is possible.

(A) The first turning roll 11a and the second turning roll 11b are arranged below the first turning roll 11a in the plate passing direction of the plate passing line of the steel plate, for example, a steel plate as described above, The turning rolls 11 a and 11 b form a passing plate changing line that changes by, for example, 90 degrees or more in the passing direction of the passing plate line, and supply the pickling bath 3 to the pickling tank 3. In the steel sheet passing line as described above, the defect detection devices 12a and 12b are installed so as to face both the upper and lower surfaces on the upstream side of the first turning roll 11a. A defect is inspected (S1: defect detection step).

(B) When a defect in the steel plate is detected by the defect detection devices 12a and 12b, the control computers 13a and 13b take in the defect detection signal and perform tracking processing based on the plate passing speed of the plate passing line. A grinding instruction signal including the width direction defect position is sent to the grinding devices 14a and 14b in anticipation of the timing at which the defect of the steel sheet will reach the required position (S2: tracking processing step).

(C) At this time, the steel plate 1a that has passed through the defect detection devices 12a and 12b sequentially passes in the order of the turning roll 11a and the turning roll 11b. It is changed by 90 degrees or more, and is sent out in the substantially same passing direction as the original passing direction and is supplied to the pickling tank 3 (S3: passing direction changing step).

(D) On the other hand, the grinding devices 14a and 14b perform grinding and removal of the grinding target surface, which becomes a defective portion generated in the steel sheet, based on the grinding instruction signal from the control computers 13a and 13b (S4: defect removal). Step) and grinding removal of the surface to be ground will be described in more detail.

  First, the grinding devices 14a and 14b perform settings such as positioning and defect removal depth prior to grinding and removal of the grinding target surface (S41: grinding setting step). Specifically, a forward / reverse positioning drive motor 27 is provided between the transverse drive frame 25 and the forward / reverse drive frame 29, and the transverse drive frame 25 is used as a base, the forward / reverse position of the forward / reverse drive frame 29, and hence the grinding head. The protruding positions of 31a and 31b are set. Further, the forward / reverse drive frame 29 includes a fluid actuator, such as a hydraulic cylinder 30a, that can independently adjust the pressing force to a side surface portion including a steel plate that is one side surface portion in the sheet passing line direction and a steel plate exit surface portion that is the other side surface portion. , 30b is attached, the pressing force of the hydraulic cylinder 30a on the side surface side with steel plate is set to a value that emphasizes the depth of defect removal, while the pressing force of the hydraulic cylinder 30b on the side surface side of the steel plate is set to A value is set with an emphasis on a value that gives a roughness that does not leave a defect trace after the process. Since the grinding heads 31a and 31b are provided with hard grinding wheels 32a and 32b, the defective portion is reliably ground by the required depth based on the set value of the defect removal depth. Is possible.

  After setting the necessary conditions for grinding as described above, the defects generated in the steel plate are ground, but at this time, the transport level of the steel plate fluctuates from moment to moment. S42: Conveyance level fluctuation following step). In this conveyance level fluctuation follow-up step S42, a fluid actuator capable of independently adjusting the pressing force is provided between the forward / reverse drive frame 29 and the grinding heads 31a and 31b. It follows so as to absorb quickly and acts to maintain the value set in advance in the grinding setting step S41.

  Then, when the grinding devices 14a and 14b receive a grinding instruction signal from the control computers 13a and 13b under the above-described tracking process of the conveyance level variation, the front plate surface portion in the sheet passing direction of the steel plate is used as the surface to be ground. Therefore, the transverse drive motor 24 constituting the grinding devices 14a and 14b adjusts the grinding heads 31a and 31b to the required width direction position based on the grinding instruction signal including the width direction defect position. The forward / backward drive frame 29 is moved forward and backward to a required position by the rotational drive of the forward / backward positioning drive motor 27, and then attached to the grinding heads 31a and 31b under the operating pressure of the lifting hydraulic cylinders 30a and 30b. The grinding wheels 32a and 32b are pressed against the surface of the metal steel plate to grind the defective portion (S43: grinding step). At this time, the defective portion is deeply removed with the grinding wheel 32a, and then the downstream grinding wheel 32b is ground to an optimum roughness.

  In the above embodiment, among the plurality of grinding wheels 32a and 32b, 32a is deeply ground. For example, both grinding wheels 32a and 32b are used to grind to a required depth in two stages, or two stages. May be adjusted so that the required roughness is obtained.

(E) When the defects of the steel plate are ground by the grinding wheels 32a and 32b as described above, chips and abrasive grains are generated. The chips and abrasive grains are tangent from the contact position between the grinding wheels 32a and 32b and the steel plate 1a. Therefore, if the chip / abrasive receiver 33 is installed directly under the grinding point, the chip / abrasive receiver 33 does not fall on the surface of the steel plate 1a to be passed through. (S5: Chip / abrasive receiving removal step).

  Therefore, according to the embodiment of the on-line defect removal apparatus and method for the metal steel strip as described above, the grinding apparatuses 14a and 14b for grinding and removing the defective portions of the steel plate detected by the defect detection apparatuses 12a and 12b are provided. A traverse drive frame 25 that traverses in the width direction of the steel plate constituting the grinding devices 14a and 14b, a forward / backward drive frame 29 that is attached to the traverse drive frame 25 and moves forward and backward (or up and down) with respect to the steel plate, and Based on the defect position detection information of the defect detection devices 12a and 12b, by providing a plurality of grinding wheels 32a and 32b to which fluid actuators capable of independently adjusting the pressing force in the plate direction of the drive frame 29 are provided. Before the defects generated in the steel plates pass through the grinding devices 14a and 14b, the transverse drive frame 2 of the grinding devices 14a and 14b. Is positioned in the width direction, the forward / reverse drive frame 29 is positioned in the front-rear direction to the required position, and the grinding wheels 32a, 32b of the grinding heads 31a, 31b are pressed against the surface of the metal steel plate to remove the defective portion and at high speed. Even if the transport level of the passing metal steel plate changes, the fluid actuator acts so as to follow the change, so that defects can be removed with high efficiency and high accuracy without excessively cutting the steel plate. be able to.

  Further, the grinding heads 31a and 31b are provided with circular hard grinding wheels 32a and 32b, and are ground with the hard grinding stone 32a while placing importance on the depth of defect removal by adjusting the pressure of the hydraulic cylinder 30a. On the other hand, since the grinding is performed with the hard grinding wheel 32b so as to obtain the optimum roughness of the steel sheet surface while taking into consideration the processing of the lower process exclusively by the other hydraulic cylinder 30b, the defect removal portion of the defect removing portion is processed after the processing of the lower process. No trace is left and the product quality can be homogenized.

  In the said embodiment, although applied to the hot-rolled steel plate 1a supplied to a pickling cold rolling continuous line, it cannot be overemphasized that it is applicable not only to the hot-rolled steel plate 1a but especially to the grinding of the surface defect of various metal steel plates. Yes. The chip / abrasive receiver 33 is installed in the vicinity of the surface of the steel plate to be ground. However, the chip / abrasive receiving body 33 is structurally, for example, if the ridge having a substantially V-shaped cross section is slightly inclined. Grains can be guided to the side of the line perpendicular to the plate direction. Moreover, if a trough having a substantially V-shaped cross section is installed horizontally and water is allowed to flow, chips and abrasive grains can be guided to the side of the line perpendicular to the plate direction. Furthermore, in the said embodiment, although the example which removes the defect which arises on both surfaces of the steel plate which passes a plate line was described, even if it is the single side | surface of a steel plate, it can apply similarly.

  Further, although the two grinding heads 31a and 31b are provided in the plate feed line direction of the forward / reverse drive frame 29, three or more grinding heads may be provided.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. In addition, the embodiments can be implemented in combination as much as possible, and in that case, the effect of the combination can be obtained. Further, each of the above embodiments includes various higher-level and lower-level inventions, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, when an invention is extracted because some constituent elements can be omitted from all the constituent elements described in the means for solving the problem, the omitted part is used when the extracted invention is implemented. Is appropriately supplemented by well-known conventional techniques.

The block diagram which shows one Embodiment of the online defect removal apparatus of the metal steel strip which concerns on this invention applied to the plate-feeding line. The side view which shows one specific example of the grinding device applied to the sheet passing line. The figure seen from illustration A arrow direction shown in FIG. The flowchart explaining the operation | movement of the online defect removal apparatus of the metal steel strip which concerns on this invention, and the online defect removal method of the metal steel strip which concerns on this invention. The figure explaining the grinding removal method of the conventional steel plate defect. The block diagram which shows the structure of the grinding apparatus of the defect shown in FIG. 5 concretely. The figure explaining the other removal method of the conventional steel plate defect. The block diagram which shows specifically the structure of the cutting device of the defect shown in FIG. The figure seen from the illustration B arrow direction shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1a ... Hot rolled steel plate, 1b ... Cold rolled steel plate, 2 ... Feeding end, 3 ... Pickling tank, 4 ... Cold rolling mill group, 5 ... Winding end, 11a ... 1st turning roll (for example, upper side) Turning roll), 11b ... second turning roll (for example, lower turning roll), 12a, 12b ... defect detection device, 13a, 13b ... control computer, 14a, 14b ... grinding device, 22 ... crossing ball screw, 23 ... Traverse guide, 24 ... traverse drive motor, 25 ... traverse drive frame, 26 ... forward / backward moving ball screw, 27 ... forward / backward positioning drive motor, 28 ... forward / backward guide, 29 ... forward / backward drive frame, 30a, 30b ... Hydraulic cylinders, 31a, 31b ... grinding heads, 32a, 32b ... grinding wheels, 33 ... chips / abrasive receivers.

Claims (5)

A defect detection device for detecting defects occurring on the surface of the metal steel strip that passes through the plate-passing line and defects appearing in the lower process, and arranged on the downstream line of the defect detection device for the plate-passing line, A grinding device for grinding the defect based on defect detection information including a defect position detected by the defect detection device;
The grinding apparatus includes a traverse drive frame that traverses in the width direction of the metal steel strip passing through the sheet passing line, and a forward / backward travel that is attached to the traverse drive frame and moves forward and backward toward a defective surface of the metal steel strip. A drive frame, and a plurality of grinding wheels provided in a fluid actuator that is attached in the plate line direction of the forward / backward drive frame and can independently adjust the pressing force,
Based on the defect detection information including the defect position, positioning in the width direction with the traverse drive frame, and moving forward and backward toward the defect surface with the forward / reverse drive frame, the grinding wheel is made to the defect surface. An on-line defect removal device for metal steel strip, which is characterized by removing defects by pressure contact. In the online defect removal apparatus of the metal steel strip according to claim 1,
The plurality of grinding wheels arranged in the direction of the plate passing line are circular hard wheels. In the on-line defect removal apparatus for metal steel strip according to claim 1 or claim 2,
Among the plurality of grinding wheels arranged in the plate line direction, the grinding wheel arranged on the upstream side grinds the defective surface to a required depth by adjusting the fluid pressure of the corresponding fluid actuator, and the downstream An on-line defect removal apparatus for a metal steel strip, characterized in that a grinding wheel disposed on the side grinds the defect surface so as to have a required roughness after processing in a lower process by adjusting a fluid pressure of the corresponding fluid actuator. . A defect detection step for detecting defects generated on the surface of the metal steel strip passing through the plate passing line and defects manifested in the lower process;
A tracking processing step for fetching a defect detection signal including a defect position detected in the defect detection step and sending a grinding instruction signal including the defect position at a timing when the defect position reaches a required grinding position;
When receiving the grinding instruction signal including the defect position, the plurality of grinding wheels arranged in the sheet passing line direction are moved in the transverse direction and the forward / backward direction, and the fluid actuator capable of independently adjusting the pressing force is used. An on-line defect removal method for a metal steel strip, comprising: a defect removal step of removing a defect by being brought into pressure contact with a defect surface. In the online defect removal method of the metal steel strip according to claim 4,
As the defect removing step, after setting a grinding setting step for setting the positioning in the forward / backward direction and the pressing force of the fluid actuator, and setting conditions necessary for grinding by the grinding setting step, the action of the fluid actuator causes the A conveyance level fluctuation following step for operating a plurality of grinding wheels so as to follow a fluctuation in the conveyance level of the metal steel strip, and a pressing force set by the fluid actuator while following the conveyance level fluctuation in the metal steel band by this step. An on-line defect removal method for a metal steel strip, comprising: a grinding treatment step of pressing the grinding wheel against the defect surface to remove the defect.

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