JP5475614B2 - Steel chamfering grinding method and steel piece chamfering grinding apparatus - Google Patents

Description

  The present invention relates to a method for chamfering and grinding a steel piece for chamfering a corner of a steel piece such as a slab or billet, and a steel piece chamfering grinding apparatus for executing the method.

  For example, for a thick plate-shaped steel piece that is cut to a predetermined length and sent to the rolling process in a continuous casting facility for slabs, it not only removes defects such as wrinkles on the surface but also chamfers the corners. It is effective to improve the product quality during rolling.

  On the other hand, the steel piece grinding apparatus of patent document 1 is proposed. According to this, the grindstone is moved along the grinding locus along the outline of the steel slab, so that the surface of the steel slab is automatically ground and defects such as wrinkles on the surface of the steel slab are removed. .

JP 2003-334746 A

  By the way, according to the steel slab grinding apparatus described in Patent Document 1, although the entire upper surface of the steel slab is automatically ground, chamfering is automatically performed on the corner formed at the peripheral edge of the steel slab. Could not be applied. For this reason, if it was going to perform the grinding operation for chamfering, it was inevitable to perform a manual operation in a high temperature working environment. On the other hand, when the grinding wheel is pressed against the side edge of the steel piece while the rotation axis of the grindstone is in a direction parallel to the side edge of the steel piece, it is driven and moved along the side edge. As the moving speed increases, the grinding wheel bites into the side edge of the steel slab, resulting in inconvenience that uniform chamfering cannot be formed efficiently.

  The present invention has been made in the background of the above circumstances, and the object of the present invention is to execute a method for chamfering and grinding a steel piece that can efficiently chamfer a uniform steel piece, and the method. An object of the present invention is to provide a steel piece chamfering grinding apparatus.

To achieve the above object, the gist of the invention according to claim 1 is that a single grinding machine that is rotated around a rotation axis parallel to a surface to be ground of a steel piece, which is a hot plate-like hot material. A chamfering grinding method for a steel piece in which a chamfering process is performed on a side edge of the steel piece by pressing the grindstone against the side edge of the steel piece and moving in a direction along the side edge. By inclining a predetermined angle with respect to the direction of the side edge of the steel slab in a plane parallel to the surface to be ground of the steel slab, the portion of the outer peripheral surface of the grinding wheel pressed against the side edge of the steel slab When one end in the width direction contacts the side edge, the other end is separated from the side edge, and the grinding wheel is moved relative to the other end side along the side edge of the steel piece. .

  Further, the gist of the invention according to claim 2 is that, in the invention of claim 1, the steel slab forms a quadrilateral in a plan view, and a side edge of the steel slab on one side of the steel slab. The moving direction of the grinding wheel for chamfering and the moving direction of the grinding wheel for chamfering the side edge of the steel piece on the other side parallel to the one side are opposite to each other. is there.

  Further, the gist of the invention according to claim 3 is that in the invention of claim 1 or 2, when chamfering the side edge of the steel piece, the side edge of the steel piece on the outer peripheral surface of the grinding wheel is used. The height position of the center of the grinding wheel from the surface to be ground of the steel slab is set to a predetermined height position correction value from the radius of the grinding wheel so that the tangent of the contact point becomes a preset chamfering angle. The position of the center of rotation of the grinding wheel in the surface direction of the surface to be ground is positioned outside the side edge of the steel slab by a predetermined external position correction value.

  Further, the gist of the invention according to claim 4 is that, in the invention of claim 3, the height position is the maximum height position dimension when the height position is the maximum diameter of the grinding wheel with respect to the maximum diameter of the grinding wheel. Is calculated on the basis of the preset ratio and the actual diameter of the grinding wheel.

  The gist of the invention according to claim 5 is that, in the invention of claim 3 or 4, the outer position correction value is a maximum outer diameter when the grinding wheel is the maximum diameter with respect to the maximum diameter of the grinding wheel. It is calculated based on the preset ratio of the position dimension and the actual diameter of the grinding wheel.

According to yet gist of chamfering grinding apparatus billet of the invention according to claim 6 for applying the method invention according to claim 1, the billet is hot material (a) longitudinal plate By chamfering the side edge of a single grinding wheel, which is rotated around a rotation axis parallel to the grinding surface, against the side edge of the steel slab while moving relative to the side edge. A chamfering grinding apparatus for a steel slab to be applied, wherein (b) a grinding cart provided so as to be relatively movable in a plane parallel to a surface to be ground of the steel slab, and (c) a grinding cart provided on the grinding cart. The grindstone is supported in a state where the rotation axis is inclined at a predetermined angle with respect to the side edge of the steel piece in a plane parallel to the surface to be ground of the steel piece, and the grinding wheel is supported with respect to the steel piece. A grindstone support driving device for approaching and separating, and (d) the steel piece of the outer peripheral surface of the grinding wheel When one end in the width direction of the portion pressed against the side edge comes into contact with the side edge, the other end is separated from the side edge, and the grinding wheel is moved toward the other end along the side edge of the steel slab. And a grinding control means for controlling the grinding carriage and the grindstone support driving device so as to move relative to each other.

  Further, the gist of the invention according to claim 7 is that, in the invention of claim 6, the steel piece forms a quadrilateral in a plan view, and the grinding control means The moving direction of the grinding wheel for chamfering the side edge of the billet is opposite to the moving direction of the grinding wheel for chamfering the side edge of the billet on the other side parallel to the one side. The moving direction of the grinding wheel is controlled so as to be in the direction.

  Further, the gist of the invention according to claim 8 is that, in the invention of claim 6 or 7, the grinding control means is configured such that the chamfering of the side edge of the steel slab is performed on the outer peripheral surface of the grinding wheel. The height position of the center of the grinding wheel from the surface to be ground of the grinding wheel is set to be greater than the radius of the grinding wheel so that the tangent of the point contacting the side edge of the steel piece becomes a preset chamfering angle. The position of the center of rotation of the grinding wheel in the surface direction of the surface to be ground is positioned outside the side edge of the steel slab by a predetermined position correction value. There is.

  The gist of the invention according to claim 9 is that, in the invention of claim 8, when the grinding control means has the height position of the maximum diameter of the grinding wheel with respect to the maximum diameter of the grinding wheel. The maximum height position dimension is calculated based on a preset ratio and the actual diameter of the grinding wheel.

  The gist of the invention according to claim 10 is that, in the invention of claim 8, the grinding control means sets the outer position correction value to the maximum diameter of the grinding wheel relative to the maximum diameter of the grinding wheel. It is to be determined based on a preset ratio of the maximum outer position dimension at that time and the actual diameter of the grinding wheel.

According to chamfering grinding method billet of the invention according to claim 1, the rotation axis of said single grinding wheel in said longitudinal plate-like hot material in a plane parallel to the ground surface of the steel strip When one end in the width direction of the portion pressed against the side edge of the steel piece in the outer peripheral surface of the grinding wheel comes into contact with the side edge by inclining a predetermined angle with respect to the direction of the side edge of the steel piece Since the grinding wheel is relatively moved along the side edge of the steel piece toward the other end while the other end is separated from the side edge, the grinding wheel is quickly moved along the side edge of the steel piece. Even if it is moved to, it will not bite into the steel slab, so that uniform chamfering of the steel slab can be performed efficiently.

  Moreover, according to the chamfering grinding method of the steel piece of the invention according to claim 2, the steel piece has a quadrilateral shape in plan view, and chamfering processing of the side edge of the steel piece on one side of the steel piece is performed. The moving direction of the grinding wheel for the above and the moving direction of the grinding wheel for chamfering the side edge of the steel piece on the other side parallel to the one side are opposite to each other. Similarly, the chamfering process of the side edge on one side and the chamfering process of the side edge on the other side parallel to the one side in the width direction of the portion pressed against the side edge of the steel piece on the outer peripheral surface of the grinding wheel Since the grinding wheel is moved toward the other end while the other end is separated from the side edge when one end contacts the side edge, uniform chamfering of the steel slabs on each side and the other side is efficient. Well done.

  According to the method for chamfering and grinding a steel slab according to the third aspect of the present invention, the tangent of the point of contact with the side edge of the steel slab on the outer peripheral surface of the grinding wheel during the chamfering of the side edge of the steel slab And the height position of the center of the grinding wheel from the surface to be ground of the steel slab is set lower than the radius of the grinding wheel by a predetermined height position correction value so that the chamfering angle is set in advance. Since the position of the rotation center of the grinding wheel in the surface direction of the surface to be ground is positioned outside the side edge of the steel slab by a predetermined external position correction value, it is preset at the side edge of the steel slab. Uniform chamfering is efficiently performed at the chamfered angle.

  According to the steel piece chamfering grinding method of the invention according to claim 4, the height position is set in advance as the maximum height position dimension when the height position is the maximum diameter of the grinding wheel with respect to the maximum diameter of the grinding wheel. Calculated on the basis of the ratio and the actual diameter of the grinding wheel, so that it does not require complicated calculation to obtain a height position correction value, and in advance on the side edge of the steel slab. Uniform chamfering is efficiently performed at the set chamfering angle.

  Moreover, according to the chamfering grinding method of the steel piece of the invention according to claim 5, the outer position correction value is set in advance as the maximum outer position dimension when the grinding wheel is the maximum diameter with respect to the maximum diameter of the grinding wheel. Since it is calculated based on the ratio and the actual diameter of the grinding wheel, it is set in advance on the side edge of the slab without requiring complicated calculation to obtain the outer position correction value. Uniform chamfering is efficiently performed at the chamfered angle.

According to the steel piece chamfering grinding apparatus of the invention according to claim 6, (b) the steel piece chamfering grinding apparatus is provided so as to be relatively movable in a plane parallel to the surface to be ground of the steel piece, which is the longitudinal plate-like hot material. And (c) a single grinding wheel provided on the grinding carriage, the rotation axis of the single grinding wheel being predetermined with respect to the side edge of the steel piece in a plane parallel to the surface to be ground of the steel piece. A grindstone support driving device that supports the grindstone in an inclined state and moves the grindstone toward and away from the steel piece; and (d) is pressed against a side edge of the steel piece on the outer peripheral surface of the grinding wheel. When one end in the width direction of the portion contacts the side edge, the grinding wheel is moved relative to the other end side along the side edge of the steel slab while the other end is separated from the side edge. And a grinding control means for controlling the grinding cart and the grindstone support driving device. Because it even when the grinding wheel is moved quickly along the side edges of the steel strip is eliminated bite into the steel piece, it is possible to perform the chamfering of uniform steel pieces efficiently.

  Further, according to the steel piece chamfering grinding apparatus of the invention according to claim 7, the steel piece has a quadrilateral shape in a plan view, and the grinding control means is provided for the steel piece on one side of the steel piece. The moving direction of the grinding wheel for chamfering the side edge and the moving direction of the grinding wheel for chamfering the side edge of the steel piece on the other side parallel to the one side are opposite to each other. Thus, since the moving direction of the grinding wheel is controlled, the chamfering of the side edge on one side of the steel slab and the chamfering processing of the side edge on the other side parallel to the one side are similarly performed on the outer periphery of the grinding wheel. When one end in the width direction of the portion pressed against the side edge of the steel piece contacts the side edge of the surface, the grinding wheel is moved toward the other end side in a state where the other end is separated from the side edge. So, steel pieces that are uniform on one side and the other side Chamfering is performed well efficiency.

  Further, according to the steel piece chamfering grinding apparatus of the invention according to claim 8, the grinding control means, when chamfering the side edge of the steel piece, the side edge of the steel piece on the outer peripheral surface of the grinding wheel. The height position of the center of the grinding wheel from the surface to be ground of the steel slab is corrected to a predetermined height position from the radius of the grinding wheel so that the tangent of the point in contact with the wheel has a preset chamfer angle Since the position in the surface direction of the surface to be ground of the center of rotation of the grinding wheel is positioned outside the side edge of the steel slab by an external position correction value determined in advance, Uniform chamfering is efficiently performed at a predetermined chamfering angle at the side edge.

  According to the steel piece chamfering grinding apparatus of the invention according to claim 9, the grinding control means has a maximum height when the height position is a maximum diameter of the grinding wheel with respect to a maximum diameter of the grinding wheel. Since it is calculated based on a preset ratio of the height position dimension and the actual diameter of the grinding wheel, the steel does not require complicated calculation to obtain the height position correction value. Uniform chamfering is efficiently performed at a predetermined chamfering angle at the side edge of the piece.

  Further, according to the steel piece chamfering grinding apparatus of the invention according to claim 10, the grinding control means has a maximum when the outer position correction value is the maximum diameter of the grinding wheel with respect to the maximum diameter of the grinding wheel. Since it is determined on the basis of a preset ratio of the outer position dimension and the actual diameter of the grinding wheel, the steel slab can be obtained without requiring a complicated calculation for obtaining the outer position correction value. Uniform chamfering is efficiently performed at a predetermined chamfering angle at the side edge.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole layout drawing of the steel piece grinding apparatus which enforces the chamfering grinding method of the steel piece of one Example of this invention. It is a principal part enlarged view which shows the grinding cart of the steel piece grinding apparatus of FIG. It is the side view which looked at the grinding cart of Drawing 2 in the x direction. It is the side view which looked at the grinding cart of Drawing 2 in the y direction. It is a figure which expands and shows the side surface seen in the x direction of the slab measurement sensor of FIG. 3 and FIG. It is a figure which expands and shows the side surface seen in the y direction of the slab measurement sensor of FIG. 3 and FIG. It is a block diagram explaining the principal part of a structure of the control apparatus for controlling the automatic grinding operation | movement of the steel piece grinding apparatus of FIG. It is a flowchart explaining the principal part of the control action by the control apparatus of FIG. It is a figure explaining the movement locus | trajectory of the center A of the grinding wheel which moves on the to-be-ground surface in grinding of the to-be-ground surface of a slab based on the control action by the control apparatus of FIG. It is a figure explaining the movement locus | trajectory of the center A of the grinding wheel which moves along the side edge in the chamfering grinding of the side edge of a slab based on the control action by the control apparatus of FIG. It is a figure which shows the map 1 used in order to obtain | require the center height of the grinding stone at the time of chamfering grinding of the side edge of a slab in the control apparatus of FIG. FIG. 8 is a diagram showing a map 2 that is used in the control device of FIG. 7 to obtain an external position correction value from the side edge of the slab at the center of the grinding wheel during chamfering grinding of the side edge of the slab. When chamfering a predetermined angle on the side edge of a slab using a grinding wheel, the height position and the outer position correction value of the center of the grinding wheel at the side edge of the slab are explained in relation to the diameter of the grinding wheel. It is.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are simplified or modified as appropriate, and the dimensional ratio, shape, hatching, broken line (hidden line), virtual line, etc. of each part are not necessarily drawn accurately.

  FIG. 1 is an overall layout diagram showing a steel slab grinding apparatus 10 for carrying out the chamfering grinding method of one embodiment of the present invention in a plan view. In FIG. 1, a slab S, which is a plate-shaped steel slab as a rolled material that has undergone the previous process, is conveyed continuously or intermittently in one direction, that is, in the y direction, by a conveying device 14 comprising, for example, four chain conveyors. It has become so. The slab S is a hot material having a length L of about 12 m, a width W of about 2 m, and a thickness T of about 0.3 m, and is conveyed in the width direction. A pair of rails 16 are disposed on the horizontal floor in parallel with the outer sides of the conveying device 14. The steel piece grinding device 10 functions as a chamfering grinding device that performs chamfering grinding of the slab S and a surface grinding device that grinds the entire surface to be ground 12 of the slab S as described later.

  The steel piece grinding apparatus 10 includes a base carriage 18 supported by a wheel (not shown) that rolls on a rail 16 so as to be movable in the y direction, and the conveyance direction of the conveyance apparatus 14 on the base carriage 18 is orthogonal to the horizontal plane. And a grinding carriage (carriage) 22 mounted with a thick disc-shaped grinding wheel GW guided by an x-direction rail 20 arranged in the direction, that is, in the x direction, and four pieces ( The wheel is rotated by a base cart drive motor 24 (one is shown in FIG. 1), so that the base cart 18 is moved in the conveying direction of the slab S, that is, in the y direction. . Since the base carriage 18 is intermittently conveyed so that the slab S stops at a preset grinding position, the surface 12 to be ground and the side edge SE of the slab S at the grinding position are ground by the grinding wheel GW. So that it is moved in the y direction. When the slab S is continuously conveyed at a constant speed, it is controlled so as to be stopped relatively in synchronization with the speed of the slab S at the start of grinding, and the ground surface 12 of the slab S and its surface are ground during grinding. In addition to the synchronous speed, the side edge SE may be moved in the y direction so that the side edge SE is ground by the grinding wheel GW.

  The base carriage 18 is provided with, for example, a y-direction position sensor PG2 that rotates together with the wheels or the base carriage drive motor 24. The y-direction position sensor PG2 directly detects the position of the base carriage 18, but also detects the movement position of the grinding wheel GW in the y direction with respect to the slab S.

  2 is an enlarged plan view of the grinding carriage 22 of FIG. 1, FIG. 3 is a side view of the grinding carriage 22 as viewed in the longitudinal direction of the x-direction rail 20, that is, the x direction, and FIG. It is the side view which looked at the grinding cart 22 in the y direction.

  As shown in FIGS. 2 to 4, the grinding cart 22 includes a wheel 26 that rolls on the x-direction rail 20, a grinding cart drive motor 28 having a pinion that meshes with a rack (not shown) fixed to the base cart 18, Grinding wheel drive comprising a grinding wheel GW rotatably provided around a single axis C inclined at a predetermined angle, for example, 45 ° with respect to the x-direction rail 20, and a grinding wheel drive motor 30 that rotationally drives it through a belt 29. The unit 32 and the lifting / lowering device 34 provided at the lower end of the grindstone drive unit 32 are provided. Accordingly, the grinding wheel GW is moved closer to and away from the slab S, and the grinding wheel GW is moved relative to the slab S in the x direction and the y direction while being pressed against the slab S. It has become. Further, an x-direction position sensor PG1 for detecting the movement position of the grinding carriage 22 is connected to the grinding carriage drive motor 28 via a timing belt or a chain.

  The elevating device 34 includes a hydraulic cylinder 36 and an upper and lower frame 38 in which the grindstone driving unit 32 is fixed to the lower end and moved up and down by the hydraulic cylinder 36. The brat fixed to the upper and lower frames 38 is provided with an upper and lower position sensor PLG for detecting the moving position of the upper and lower frames 38, that is, the height position of the grinding wheel GW. The grindstone drive unit 32 and the lifting device 34 to which the grindstone drive unit 32 is attached are provided on the grinding carriage 22, and the grinding wheel GW has a rotational axis C parallel to the surface to be ground 12 of the slab S. It functions as a grindstone support driving device that supports the grindstone GW with respect to the slab S while supporting the grindstone GW at a predetermined angle with respect to the side edge SE.

  A pair of slab measuring struts 48 provided at both ends in the y direction of the grinding carriage 22 so as to be vertically movable by hydraulic cylinders 40 and 42, respectively, and slab measuring sensors 44 and 46 respectively provided at the lower ends. 50 is provided. These slab measuring sensors 44 and 46 are respectively provided with laser beam distance meters 52 and 54 for detecting the width end position of the slab S, and a projector 56 constituting a photoelectric sensor for detecting the length L of the slab S. And one and the other of the light receivers 58. The slab measurement sensors 44 and 46 are configured similarly to each other, and FIGS. 5 and 6 show the slab measurement sensor 46 in an enlarged manner. FIG. 5 is a side view of the slab measurement sensor 46 viewed in the x direction, and FIG. 6 is a side view of the slab measurement sensor 46 viewed in the y direction.

  As shown in FIG. 3, when the slab S is conveyed to the grinding position, the slab measurement is performed as shown by a two-dot chain line in FIG. 3 prior to grinding of the chamfered surface 12 and the side edge SE of the slab S. With the sensors 44 and 46 lowered to the position of the slab S, the grinding carriage 22 is moved by one stroke so that the width of the end face in the width direction of the slab S is calculated in order to calculate the width dimension W of the slab S. The end position is measured, and the length dimension L of the slab S is measured. The length dimension L of the slab S is measured by detecting the reference side end position and the other end position of the slab S by the photoelectric sensor.

  Returning to FIG. 1, the base carriage 18 has a control chamber 66 provided with a dust collector 60 that collects dust generated during grinding, a hydraulic unit 62 that functions as a hydraulic source of the hydraulic cylinders 36, 40, and 42, and a control device 64. Is provided. The control device 64 is in a state in which one end in the width direction of a portion pressed against the side edge SE of the slab S on the outer peripheral surface of the grinding wheel GW contacts the side edge SE, and the other end is separated from the side edge SE. Then, the grinding carriage 22 and the grindstone support drive device (the grindstone drive unit 32 and the lifting device 34 to which the grindstone drive unit 32 is attached) are arranged so as to move the grinding wheel GW toward the other end along the side edge SE of the slab S. It functions as a grinding control means to control.

  FIG. 7 is a block diagram illustrating a main part of the configuration of the control device 64 for controlling the automatic grinding operation of the steel slab grinding device 10. The control device 64 is a so-called microcomputer provided with a CPU, RAM, ROM, input / output interface, and the like, a motor drive current control circuit for controlling the base carriage drive motor 24, the grinding carriage drive motor 28, and the grinding wheel drive motor 30. And a hydraulic control circuit having a solenoid valve for controlling the hydraulic cylinders 36, 40, 42, and processes input signals in accordance with a program stored in the ROM in advance while using a temporary storage function of the RAM. , Outputs a signal for controlling the motor and a signal for controlling the hydraulic cylinder. As the input signal, for example, movement of each part input from the x-direction position sensor PG1, the y-direction position sensor PG2, the vertical position sensor PLG, the laser beam distance meters 52 and 54, the photoelectric sensors (light projector 56 and light receiver 58), and the like. A signal indicating the position, a signal related to the dimension of the slab S, a signal indicating the diameter of the grinding wheel GW optically detected by the grinding wheel diameter sensor 68, for example, when the grinding carriage 22 is located at the home position shown in FIG. These are signals input from the input operation device of the operation panel 70.

  FIG. 8 is a flowchart for explaining a main part of the control operation of the control device 64. In FIG. 8, when a new slab S is positioned at the grinding position by the transport device 14 in the state where the automatic mode is set on the operation panel 70, the length measurement operation is performed in step S <b> 1 (hereinafter, step is omitted). In order to start the operation, the grinding carriage 22 is moved forward from the home position in the longitudinal direction of the slab S, and when the end of the slab S in the x direction is detected, the slab measurement sensors 44 and 46 are raised to the rising end. When it reaches, the length measuring operation is completed in step S2. In this length measurement operation, the width dimension W of the slab S is based on the signals input from the laser beam distance meters 52 and 54, the photoelectric sensors (light projector 56 and light receiver 58), and the signal from the x-direction position sensor PG1. And the length dimension L is calculated. For example, a value obtained by subtracting the laser beam distance meters 52 and 54 detected by the laser beam distance meters 52 and 54 from the distance between the laser beam distance meters 52 and 54 is determined as the width dimension W of the slab S. The distance between the position of the home position of the grinding carriage 22 detected by the x-direction position sensor PG1 and the position when the end of the slab S in the x-direction is detected by the photoelectric sensor is the length of the slab S. Determined as dimension L.

  In subsequent S3, the slab S of the grinding wheel GW rotated around the axis C inclined at a predetermined angle, for example, 45 ° with respect to the x direction, in a plane parallel to the surface 12 to be ground (that is, a horizontal plane) that is the upper surface of the slab S. The entire grinding surface 12 of the slab S is uniformly ground by moving the grinding point, which is a pressing point for the slab S, along the locus K1 shown in FIG. That is, by controlling the base carriage drive motor 24 and the grinding carriage drive motor 28, the grinding point of the grinding wheel GW is determined based on the position of the slab S and the width dimension W and length dimension L of the slab S, for example, FIG. The grinding wheel GW which is positioned at a predetermined grinding start position of the slab S in the upper left corner of the slab S, is then lowered by the lifting device 34 and is rotationally driven by the grinding wheel drive motor 30, and predetermined grinding is performed. By pressing the slab S so as to obtain a margin and controlling the base carriage drive motor 24 and the grinding carriage drive motor 28 in this state, the grinding point of the grinding wheel GW is moved along the locus shown in FIG. The entire surface 12 of the slab S is ground uniformly. Thereby, the surface 12 to be ground of the slab S is sequentially ground by the grinding wheel GW reciprocated along the grinding paths Pk11, Pk12,... Pk1n parallel to the longitudinal direction mainly constituting the locus K1. When the remaining grinding pass is reduced to a preset number of passes such as several passes, for example, along the locus K2 from the grinding start position of the slab S predetermined in the lower right corner of FIG. When the grinding operation is performed and the grinding paths Pk21, Pk22,... Pk2n constituting the locus K2 from the grinding start position overlap with the grinding path Pk1n of the previous locus K1, the surface 12 to be ground of the slab S is totally formed. And finished there.

  Next, in S4, as shown in FIG. 10, the side edges SE1 to SE4 of the four sides of the slab S that are rectangular in plan view are x in the plane parallel to the surface to be ground 12 of the slab S as described above. The grinding wheel GW rotated around an axis C inclined at a predetermined angle, for example, 45 ° with respect to the direction, with the center point A of the grinding wheel GW positioned outside the side edge SE of the slab S. One end in the width direction of the outer peripheral surface of the GW is pressed by the side edge SE of the slab S, and along the side edge SE toward the other end in the width direction separated from the side edge SE of the outer peripheral surface of the slab S. As a result, chamfering of a predetermined angle, for example, 25 ° is formed. Thereby, the moving direction of the grinding wheel GW for chamfering the side edge SE1 or SE2 on one side of the slab S, and the grinding wheel GW for chamfering the side edge SE3 or SE4 on the other side parallel to the one side thereof. The moving directions are opposite to each other. Here, as the center point A of the grinding wheel GW, a position corresponding to the axis C of the plane located on the slab S side of both planes orthogonal to the axis C of the grinding wheel GW is used for control. ing.

  Here, when chamfering the side edge SE1 to the side edge SE4 of the slab S in S4, the tangent of the point that contacts the side edge SE of the slab S on the outer peripheral surface of the grinding wheel GW is set in advance to about 25 °, for example. The height position H from the ground surface 12 of the slab S of the center A of the grinding wheel GW so that the chamfering angle θ is equal to the height position correction value obtained in advance from the radius R of the grinding wheel GW. The position of the center A of the grinding wheel GW in the surface direction of the ground surface 12 by the external position correction value Δy determined in advance is set to be lower by Δh, and the side edge SE2 and the side of the slab S by the external position correction value Δx. It is located outside the edge SE4 and is located outside the side edge SE1 and the side edge SE3 of the slab S by the outer position correction value Δy. Then, for each of the side edges SE1 to SE4, the center A of the grinding wheel GW is moved along the arrow indicated by the solid line in FIG. In FIG. 10, an arrow indicated by a broken line parallel to the arrow indicated by the solid line indicates a locus of the return path when a plurality of grindings are required for each of the side edges SE1 to SE4.

  That is, in S4, first, the corrected height position H is calculated based on the actual wheel diameter D of the grinding wheel GW from the relation 1 or map 1 stored in advance. However, the height position correction value Δh is calculated from a previously stored relationship or map, and the height position correction value Δh is subtracted from the actual grinding wheel radius R, so that the slab S of the center A of the grinding wheel GW is covered. The height position H (= R−Δh) from the grinding surface 12 may be calculated. Further, the outer position correction value Δx and the outer position correction value Δy are calculated based on the actual wheel diameter D of the grinding wheel GW from the relationship 2 or the map 2 stored in advance, and the center A of the grinding wheel GW is corrected to the outer position. The side edge SE2 and the side edge SE4 are shifted outward in the x and y directions by the value Δx and the outer position correction value Δy. For example, when chamfering the side edge SE1 or the side edge SE3, the position (x, y) in the xy plane where the center A of the grinding wheel GW moves along the side edge SE1 or the side edge SE3 is corrected. The center A of the grinding wheel GW is set to (x, y + Δy) or (x, y−Δy). When the side edge SE2 or the side edge SE4 is chamfered, the position (x, y) in the xy plane where the center A of the grinding wheel GW moves along the side edge SE2 or the side edge SE4 is corrected. The center A of the grinding wheel GW is set to (x + Δx, y) or (x−Δx, y). The relation 1 is shown in the equation (1), and the map 1 is illustrated in FIG. Further, the relationship 2 is shown in the equation (2), and the map 2 is illustrated in FIG.

H = D × F1 + d (1)
(F1 is a ratio (ratio) Hmax / Dmax of the maximum value Hmax of the height position H of the center A of the grinding wheel GW to the maximum diameter Dmax of the grinding wheel GW, and d is a safety allowance set as necessary. is there.)

Δx = Δy = D × F2 + p (2)
(F2 is the ratio (ratio) Δxmax / Dmax or Δymax / Dmax of the maximum value Δxmax or Δymax of the external position correction value Δx or Δy with respect to the maximum diameter Dmax of the grinding wheel GW, and p is a safety set as necessary. .)

  FIG. 13 is a diagram for explaining the height position H and the outer position correction value Δy at the side edge SE1 of the slab S in relation to the diameter D of the grinding wheel GW. In FIG. 13, 25 ° with respect to the side edge SE1 of the slab S at each diameter of an ellipse (showing an elliptical shape when viewed in the x direction) of the two surfaces of the grinding wheel GW that are in contact with the slab S. When the grinding wheel GW is brought into contact with the chamfering angle θ, the maximum diameter Dmax, the intermediate diameter Dmid, the minimum diameter Dmin, the maximum height position Hmax of the center A of the grinding wheel GW, the intermediate height position Hmid, the minimum height. The relationship with the position Hmin is shown. The maximum height position Hmax, intermediate height position Hmid, and minimum height position Hmin of the center A of the grinding wheel GW are all approximate to the maximum diameter Dmax, intermediate diameter Dmid, and minimum diameter Dmin of the actual grinding wheel GW at that time. The height position correction value Δh (= D− (D × F1)) is smaller than them. A map 1 in FIG. 11 shows the above-described proportional relationship by a numerical value, and the maximum height position H of the center A of the grinding wheel GW obtained from this map 1 is ground with respect to the maximum diameter Dmax of the grinding wheel GW. This is based on the ratio (ratio) F1 (= Hmax / Dmax) of the maximum value Hmax of the height position H of the center A of the grindstone GW.

  In FIG. 13, when the tangent of the intersection of the grinding wheel GW with the side edge SE1 of the elliptical slab S indicating the respective diameters is a chamfering angle θ of 25 °, that is, the grinding wheel GW is slabs at the respective diameters. When the grinding wheel GW is brought into contact with the side edge SE1 of S at a chamfering angle θ of 25 °, the grinding wheel GW has the maximum diameter Dmax, the intermediate diameter Dmid, the minimum diameter Dmin, and the side edge SE1 of the center A of the grinding wheel GW. The relationship among the maximum outside position correction value Δymax, the intermediate outside position correction value Δymid, and the minimum outside position correction value Δymin, which are distances, is shown. The maximum outside position correction value Δymax, the intermediate outside position correction value Δymid, and the minimum outside position correction value Δymin, which are distances from the side edge SE1 of the center A of the grinding wheel GW, are all the maximum diameters of the actual grinding wheel GW at that time. It is approximately proportional to Dmax, intermediate diameter Dmid, and minimum diameter Dmin. A map 2 in FIG. 12 shows the above-described proportional relationship as a numerical value. The outer position correction value Δy of the center A of the grinding wheel GW obtained from this map 2 is a value for grinding with respect to the maximum diameter Dmax of the grinding wheel GW. This is based on the ratio (ratio) F2 (= Δymax / Dmax) of the outer position correction value Δy of the center A of the grindstone GW. Incidentally, in this embodiment, Dmax = 760 mmφ, Dmid = 600 mmφ, Dmin = 440 mmφ, Hmax = 361 mm, Hmid = 284 mm, Hmin = 209 mm, Δymax = 84 mm, Δymid = 66 mm, Δymin = 49 mm.

  When the ground surface 12 and the chamfering grinding of the slab S are performed as described above, the grinding is completed as shown in S5 of FIG. 8, and therefore the base carriage 18 and the grinding carriage 22 in S6. Is returned to the home position shown in FIG. 1, and the grindstone drive unit 32 is raised by the elevating device 34. Then, the diameter D of the grinding wheel GW mounted on the grinding wheel drive unit 32 is detected by the grinding wheel diameter sensor 68 and stored in the RAM or the like of the control device 64 for the next grinding.

  As described above, according to the chamfering grinding method of the slab S of this embodiment or the steel piece grinding apparatus (chamfering grinding apparatus) 10 for carrying out the method, the slab S (steel piece) is parallel to the surface to be ground 12. By inclining a predetermined angle with respect to the direction of the side edge SE of the slab S steel piece in the plane, one end in the width direction of the portion pressed against the side edge SE of the slab S on the outer peripheral surface of the grinding wheel GW Since the grinding wheel GW is relatively moved along the side edge SE of the slab S toward the other end while the other end is separated from the side edge SE when contacting the side edge SE, the grinding wheel GW Since the grinding wheel GW does not bite into the slab S even if it is moved quickly along the side edge SE of the slab S, uniform chamfering of the slab S can be performed efficiently.

  Moreover, according to the chamfering grinding method of the slab S of this embodiment or the steel slab grinding apparatus 10 for carrying out the slab S, the slab S has a quadrilateral shape in a plan view, and a side edge on one side of the slab S. The moving direction of the grinding wheel GW for chamfering of SE1 and the moving direction of the grinding wheel GW for chamfering of the side edge SE3 of the slab S on the other side parallel to the one side are opposite to each other. Therefore, the chamfering of the side edge SE1 on one side of the slab S and the chamfering of the side edge SE3 on the other side parallel to the one side are respectively performed on the side surface SE of the slab S of the outer peripheral surface of the grinding wheel GW. This is similarly performed by moving the grinding wheel GW toward the other end side in a state where one end in the width direction of the portion pressed against the side edge SE comes into contact with the side edge SE and the other end is separated from the side edge SE. Runode, chamfer uniform slab S is performed respectively be efficiently at the side and the other side.

  Moreover, according to the chamfering grinding method of the slab S of this embodiment or the steel piece grinding apparatus 10 for carrying out the chamfering process of the side edge SE of the slab S, the slab S of the outer peripheral surface of the grinding wheel GW The height position H from the surface to be ground 12 of the slab S at the center of the grinding wheel GW is set to the radius D of the grinding wheel GW so that the tangent of the point contacting the side edge SE becomes a preset chamfering angle θ. And the position of the center A of the grinding wheel GW in the surface direction of the ground surface 12 of the grinding wheel GW by the predetermined external position correction value Δx or Δy. Since it is positioned outside the side edge SE, uniform chamfering is efficiently performed at the side edge SE of the slab S at a preset chamfering angle θ.

  Moreover, according to the chamfering grinding method of the slab S of this embodiment or the steel piece grinding apparatus 10 for carrying out the same, the height position H is the maximum diameter of the grinding wheel GW relative to the maximum diameter Dmax of the grinding wheel GW. Since it is calculated on the basis of a preset ratio F1 of the maximum height position dimension Hmax when Dmax and the actual diameter D of the grinding wheel GW, it is complicated to obtain the height position H. A uniform chamfering can be efficiently performed at the side edge SE of the slab S at a preset chamfering angle θ without requiring a simple calculation.

  Moreover, according to the chamfering grinding method of the slab S of this embodiment or the steel piece grinding apparatus 10 for carrying out the same, the outer position correction value Δx or Δy is determined by the grinding wheel GW with respect to the maximum diameter Dmax of the grinding wheel GW. Since it is calculated on the basis of the preset ratio F2 of the maximum outer position dimension Δxmax or Δymax when the maximum diameter Dmax and the actual diameter D of the grinding wheel GW, the outer position correction value Δx or Uniform chamfering is efficiently performed at the chamfering angle θ set in advance on the side edge SE of the slab S without requiring complicated calculation for obtaining Δy.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, in the above-described embodiment, the grinding wheel GW can perform grinding or chamfering of the surface 12 to be ground of the slab S at an inclination angle of 45 ° with respect to the moving direction of the axis C along the side edge SE. However, the grinding wheel oblique angle of the grinding wheel GW is not limited to 45 °, and grinding may be performed with another grinding wheel oblique angle such as 30 ° or 60 °.

  In the above-described embodiment, the thickness T of the slab S is 300 mm, the maximum diameter Dmax of the grinding wheel GW is 760 mmφ, and the chamfering angle θ is 25 °. However, this is only an example. D, chamfering angle θ, and the like can be variously changed as necessary.

  Moreover, in the above-mentioned Example, although the thick plate-shaped slab S was illustrated as a steel piece, this invention can be applied even if it is a steel piece of another shape.

  In the above-described embodiment, the warp of the slab S is not detected. However, the warp of the slab S may be detected, and the height H of the grinding wheel GW may be corrected based on the warp. .

  In the above-described embodiment, the slab S is fixed and grinding is performed while the grinding wheel GW is moved. However, the grinding wheel GW is fixed and grinding is performed while the slab S is moved. Also good. In short, the grinding wheel that is rotated around the axis of rotation parallel to the surface to be ground of the steel slab is pressed against the side edge of the steel slab and moved relatively in the direction along the side edge to Chamfering may be performed.

  The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

10: Steel piece grinding machine (chamfer grinding machine)
12: Surface to be ground 22: Grinding carriage 32: Grinding wheel drive unit (grinding wheel support drive device)
34: Lifting device (grinding stone support drive device)
64: Control device (grinding control means)
GW: grinding wheel C: axis S: slab (steel)
SE: Side edge (corner)

Claims (10)

A single grinding wheel that is rotated around the axis of rotation parallel to the surface to be ground of the steel slab, which is a long plate-like hot material, is pressed against the side edge of the steel slab in a direction along the side edge. A method of chamfering and grinding a steel slab that chamfers the side edge by relative movement,
By tilting the rotation axis by a predetermined angle with respect to the direction of the side edge of the steel slab in a plane parallel to the surface of the steel slab, the side edge of the steel slab out of the outer peripheral surface of the grinding wheel When one end in the width direction of the portion pressed against the side edge contacts the side edge, the other end is separated from the side edge, and the grinding wheel is moved toward the other end side along the side edge of the steel slab. A method for chamfering and grinding a steel slab characterized by relatively moving the steel pieces. The steel piece has a quadrilateral shape in plan view,
The moving direction of the grinding wheel for chamfering the side edge of the steel slab on one side of the steel slab, and the grinding wheel for chamfering the side edge of the steel slab on the other side parallel to the one side 2. The method of chamfering and grinding a steel slab according to claim 1, wherein the moving directions are opposite to each other.   In chamfering the side edge of the steel slab, the center of the grinding wheel is set so that the tangent of the point of contact with the side edge of the steel slab on the outer peripheral surface of the grinding wheel becomes a preset chamfering angle. The height position of the steel piece from the surface to be ground is positioned lower than the radius of the grinding wheel by a predetermined height position correction value, and the rotation center of the grinding wheel is rotated by the predetermined external position correction value. The method of chamfering and grinding a steel slab according to claim 1 or 2, wherein a position in a surface direction of the grinding surface is positioned outside a side edge of the steel slab.   The height position is calculated based on a preset ratio of a maximum height position dimension when the grinding wheel is a maximum diameter with respect to a maximum diameter of the grinding wheel and an actual diameter of the grinding wheel. The method for chamfering and grinding a steel slab according to claim 3.   The outer position correction value is calculated based on a preset ratio of the maximum outer position dimension when the grinding wheel is the maximum diameter with respect to the maximum diameter of the grinding wheel and the actual diameter of the grinding wheel. The method for chamfering and grinding a steel slab according to claim 3 or 4, wherein: A single grinding wheel that is rotated around the axis of rotation parallel to the surface to be ground of the steel slab, which is a long plate-like hot material, is pressed against the side edge of the steel slab in a direction along the side edge. A chamfering and grinding device for a steel piece that performs chamfering on the side edge by relative movement,
A grinding carriage provided so as to be relatively movable in a plane parallel to the surface to be ground of the steel piece;
Provided on the grinding carriage, supporting the grinding wheel in a state where the rotation axis of the grinding wheel is inclined at a predetermined angle with respect to a side edge of the steel slab in a plane parallel to the surface to be ground of the steel slab, and A grindstone support driving device for moving the grinding grindstone toward and away from the steel piece;
Of the outer peripheral surface of the grinding wheel, when one end in the width direction of the portion pressed against the side edge of the steel slab contacts the side edge, the other end is separated from the side edge, and the grinding wheel is A chamfering grinding apparatus for a steel slab, comprising: a grinding control means for controlling the grinding carriage and the grindstone support driving device so as to be relatively moved along the side edge of the steel slab toward an end side.   The steel slab has a quadrilateral shape in plan view, and the grinding control means includes a moving direction of the grinding wheel for chamfering a side edge of the steel slab on one side of the steel slab, The moving direction of the grinding wheel is controlled so that the moving direction of the grinding wheel for chamfering of the side edge of the steel slab on the other parallel side is opposite to each other. 6 Chamfer grinding machine for steel pieces.   In the chamfering process of the side edge of the steel slab, the grinding control means is configured so that a tangent of a point of contact with the side edge of the steel slab on the outer peripheral surface of the grinding wheel has a preset chamfering angle. The height position of the center of the grinding wheel from the surface to be ground of the steel slab is positioned lower than the grinding wheel radius by a predetermined height position correction value, and the grinding wheel is set by a predetermined external position correction value. The apparatus for chamfering and grinding a steel slab according to claim 6 or 7, wherein a position of the center of rotation in the surface direction of the surface to be ground is positioned outside a side edge of the steel slab.   The grinding control means includes a preset ratio of a maximum height position dimension when the height position is a maximum diameter of the grinding wheel with respect to a maximum diameter of the grinding wheel, and an actual diameter of the grinding wheel. 9. The apparatus for chamfering and grinding a steel slab according to claim 8, wherein the chamfering and grinding apparatus is based on the above.   The grinding control means is configured such that the outer position correction value is a preset ratio of a maximum outer position dimension when the grinding wheel is a maximum diameter with respect to a maximum diameter of the grinding wheel, and an actual diameter of the grinding wheel. 9. The apparatus for chamfering and grinding a steel slab according to claim 8, wherein the apparatus is determined based on the above.

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