JP2014073507A - Method for removing weld deposit on end surface of continuous casting slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end surface weld deposit removal method of a continuous casting slab, capable of efficiently removing remaining deposits and cutting burrs 70 newly generated on the whole end surface of a slab 50, without using a plurality of devices for removing the weld deposits remaining on the end surface of the slab 50.SOLUTION: A cutting tool 1 is made by disposing a plurality of cutting blades 12 on a crown circle surface 10 of a frusto-conical tool body to make a face milling cutter, and also by disposing the plurality of cutting blades 12 on a conical surface 20 to make a plain milling cutter. By using the cutting tool, a face milling cutting step is performed to a front 52 of the end surface of a slab 50, while leveling a rotating shaft 40 of the cutting tool 1 by supporting the cutting tool 1 movably and adjustably in the front and back, right and left and up and down directions. After that, a step of simultaneously cutting the deposits and new cutting burrs 70 with the plain milling cutter is performed to at least one of an upper corner 54 or a lower corner 56 at which new cutting burrs 70 generated by the above step deposit.

Description

  The present invention relates to a method for removing welds and the like remaining on an end surface of a slab after a continuous cast slab is cut or welded into a slab having a predetermined length.

  In a continuous slab casting facility, a continuously cast slab is cut into a predetermined length by a cutting machine to obtain a continuous cast slab (hereinafter simply referred to as “slab” unless otherwise specified), and predetermined processing. Then, it is sent to the next hot rolling line. At this time, a so-called welding burr, noro, or weld deposit called molten sag may occur on the cut end surface of the slab. The cause of the formation of such a welded material is that the melted steel hardens around the cut surface when a slab is cut using a gas cutter. Also, when the upper and lower surfaces of a slab are cut by a scurfer machine to remove inclusion defects on the surface of the slab, the molten steel flows down to the surface of the slab end, and from the upper corner of the slab end surface It is mentioned that it hardens in the range over the lower corner.

  If such a deposit adhered to the end face of the slab is left as it is, it causes linear flaws on the surface of the steel sheet or surface peeling in the subsequent rolling process or plating process. Therefore, as a method of removing the welded material, a method of grinding using a grindstone or a grinder (Patent Document 1), a method of cutting using a cutting tool or the like (Patent Document 2), and the like have been proposed.

Japanese Patent Laid-Open No. 04-283064 Japanese Patent Laid-Open No. 08-141714

  However, in the invention disclosed in Patent Document 1, since the processing capacity of the grinder is relatively small, a certain amount of time is expected when grinding a slab end face having a wide area as a processing target. In addition, new grinding burrs and burrs may be generated by grinding, and it is necessary to separately perform a plurality of grinding operations in order to remove the new burrs and the like. Therefore, when considering the entire grinding operation of the slab end face, it takes a considerable amount of time. Therefore, in order to adjust the pace of the grinding operation to the production rate of the slab in a general continuous casting facility, it is necessary to arrange a plurality of grinding machines on the conveyance line of the continuous casting slab. Therefore, when the invention disclosed in Patent Document 1 is applied, the configuration of the transfer line becomes complicated, and the introduction cost and maintenance cost of the grinding machine increase.

In addition, in the invention disclosed in Patent Document 2, although the weld deposit remaining on the lower corner portion of the slab end face can be removed, the weld deposit remaining on a portion other than the lower corner portion, that is, the center portion or the upper corner portion of the slab end face. Things cannot be removed.
The present invention has been made in view of the above problems, and without using a plurality of devices to remove the deposits remaining on the end surface of the slab, the slab includes not only the lower corner portion but also other portions. An object of the present invention is to provide a method for removing an end surface weld from a continuous cast slab, which can efficiently remove a remaining weld and a newly generated cutting burr on the entire end surface.

In order to achieve the above object, the present invention is characterized in that the end surface welded material removing method for a continuously cast slab according to the present invention is configured as follows.
That is, the first aspect of the present invention is a method for removing weld deposits remaining on the end face of a slab by gas cutting or scurfer cutting of the slab in a continuous casting slab conveyance line, A plurality of cutting edges are arranged along the circumferential direction on the top circular surface of the trapezoidal tool body so that the top circular surface side is a front milling cutter, and a plurality of cutting edges are formed along the circumferential direction on the conical surface of the tool body. Using a cutting tool with a blade and a conical surface on the side of a flat milling cutter, with the rotation axis of the tool leveled, the top circular side faces the slab end face and the opposite side is the rear side. Side, and when the width direction of the slab end face is left and right, after the tool is supported so as to be movable in the front and rear, left and right and up and down directions, among the following steps A to C, first, the A step is performed. Cutting caused by the process A Li is attached, to at least one of upper corner or lower corner of the slab end faces, and performs corresponding B or C process.

A: The top circular surface side is brought into contact with the slab end surface while rotating the tool with respect to the front surface of the slab end surface, and the slab end surface is face milled while moving the tool back and forth, left and right, and up and down, Front processing step B of cutting the welded material: While rotating the tool against the upper corner, the lower side of the conical surface is brought into contact with the upper corner, and the tool is moved back and forth, left and right, and up and down. Upper corner processing step C: flat milling the upper corner portion and cutting the weld deposits remaining on the upper corner portion or the cutting burrs generated by the process A: the conical surface of the conical surface while rotating the tool with respect to the lower corner portion The upper corner is brought into contact with the lower corner portion, and the tool is moved back and forth, left and right, and up and down, and the lower corner portion is flat milled to cut the weld deposit remaining on the lower corner portion or the cutting burr generated by the process A. Lower corner machining process

  According to a second aspect of the present invention, in the first aspect, when the cutting tool is arranged to be tilted left and right with respect to the end surface of the slab while the rotating shaft is horizontal, the second aspect is arranged on the top circle surface. Among the plurality of cutting blades, the process A may be performed using either the cutting blade on the front side or the cutting blade on the rear side in the moving direction of the tool.

  In the third aspect of the present invention, in the second aspect described above, the rotation direction of the tool with respect to the slab and the state of the cutting edge used in the step A in the case where the right and left movement direction of the tool is the following I When the combination of the following is the following (a) or (b), and when the lateral movement direction of the tool is the following II, the rotation direction of the tool with respect to the slab and the cutting used in the step A at that time When the combination with the state of the blade is the following (c) or (d), the three steps may be performed in the order of the B step, the A step, and the C step.

I: When the left and right movement direction of the tool is from left to right (a) When the rotation direction is clockwise and the cutting blade used is the front side of movement (b) The rotation direction is counterclockwise and the cutting used When the blade is in the rear side
II: When the right / left movement direction of the tool is from right to left (c) When the rotation direction is clockwise and the cutting edge to be used is after movement (d) The rotation direction is counterclockwise and used When the cutting edge is in the pre-movement state

  Further, in the fourth aspect of the present invention, in the second aspect, the rotation direction of the tool with respect to the slab and the cutting edge used in step A at that time when the lateral movement direction of the tool is the following III: When the combination with the state is the following (e) or (f), and when the lateral movement direction of the tool is IV, the rotation direction of the tool with respect to the slab and the step A at that time When the combination with the state of the cutting blade to be used is the following (g) or (h), the three steps may be performed in the order of the C step, the A step, and the B step.

III: When the left / right movement direction of the tool is from the left side to the right side (e) When the rotation direction is clockwise and the state of the cutting edge to be used is the moved side (f) The rotation direction is counterclockwise and is used When the cutting edge is in the pre-movement state
IV: When the right and left movement direction of the tool is from right to left (g) When the rotation direction is clockwise and the cutting edge used is the front side of movement (h) The rotation direction is counterclockwise and the cutting used When the blade is in the rear side

  In the first and second aspects of the present invention, before the slab is charged into the heating furnace, the slab end face is subjected to face milling using one face of a single cutting tool and adhered to the slab end face. After the object is removed, the cutting tool that has been newly generated by the front milling is further quickly applied to the upper corner or the lower corner of the slab end surface on the side to which the cutting burr is attached. By moving and performing flat milling using the other surface of the cutting tool, newly generated cutting burrs can be removed as close to zero as possible. Therefore, in the operation of removing the weld deposits remaining on the end surface of the slab, the welded material and the new cutting burr are efficiently used on the entire end surface including the upper corner portion and the lower corner portion using a device to which a single cutting tool is applied. Can be removed.

It is a front view of the cutting tool used for this invention. It is a side view of the cutting tool used for this invention. It is a figure explaining the positional relationship of the cutting tool and slab in this invention. It is a figure explaining the operation | movement which carries out face milling by planar view. It is a figure explaining the operation | movement which carries out the plane milling of the upper corner part by planar view. It is a figure explaining the operation | movement which carries out flat milling of the lower corner part by planar view. It is a perspective view which shows the slab end surface by which face milling was carried out using this invention. It is explanatory drawing which shows the state of the slab end surface lower corner part by which the face milling was carried out. It is a top view at the time of arrange | positioning a cutting tool diagonally with respect to a slab end surface. It is a perspective view which shows the slab end surface by which the front milling and the flat milling were carried out. It is a figure explaining the process of a series of cutting operation | movement in embodiment of this invention.

  Embodiment of this invention is mainly implemented on the conveyance table of the slab conveyance line of a continuous casting installation, Comprising: It will be implemented in the predetermined position before performing the hot rolling process which is a next process. The slab is cut by a gas cutter until it is transported to this position, and the welded material generated at that time adheres to both ends of the slab in the longitudinal direction centering on the lower corner of the slab end face. However, the welded material is not illustrated in the following drawings for explanation. Further, it is assumed that the slab has been subjected to a surface treatment by a skater lathe before being transported to this position. The welds resulting from these treatments adhere to the entire end surfaces on the end surfaces in the longitudinal direction and the width direction of the slab. The position of the slab is fixed on the transfer line with the end face having such a welded material facing a cutting tool described later. Hereinafter, description will be given based on the drawings. It should be noted that the shape, size, and ratio of the cutting tool, the slab end face, and the like shown in the drawing are appropriately simplified and exaggerated for the purpose of explanation.

(Structure of cutting tool and slab)
FIG. 1 is a front view of a cutting tool 1 used in the present invention, and FIG. 2 is a side view thereof.
As shown in FIGS. 1 and 2, the cutting tool 1 used in the present invention has a tool body having a truncated cone shape, and a cutting edge 12 arranged on the top circular surface 10 at equal intervals along the circumferential direction. Is provided. Further, the conical surface 20 is also provided with cutting edges 12 arranged at equal intervals along the circumferential direction. One end of the rotary shaft 40 is fixed to the bottom circular surface 30 side of the tool body, and a drive device (not shown) and a support device (not shown) for applying a rotational force to the rotary shaft 40 are attached to the other end. It has been.

  The cutting blades 12 have a substantially rectangular parallelepiped chip shape and are respectively disposed on the top circular surface 10 and the conical surface 20. All of these tips may have the same shape, or the cutting blade 12 disposed on the top circular surface 10 and the cutting blade 12 disposed on the conical surface 20 may have different shapes. Further, the plurality of cutting blades 12 arranged on the top circular surface 10 or the conical surface 20 may not necessarily be equally spaced as long as the cutting operation of the end surface of the slab 50 described later is possible.

  In FIG. 1, four cutting edges 12 are arranged on the top circular surface 10, and each flat surface thereof is arranged so as to be aligned with a surface perpendicular to the axial direction of the rotary shaft 40 of the cutting tool 1. As the cutting tool 1 rotates, these cutting edges 12 cut the surface of the object. In the present invention, these cutting edges 12 on the top surface 10 are used as a face milling cutter. These cutting blades 12 do not have to be an insert type as in the present embodiment as long as they operate as a face milling cutter, and are an integrated type obtained by processing the material of the tool body into a cutting blade shape. Also good. Further, the number of cutting blades 12 may be changed as appropriate.

  As shown in FIG. 2, the generatrix of the conical surface 20 has an angle θ with respect to the bottom circle of approximately 45 degrees. Eight cutting edges 12 are arranged on the conical surface 20, and each flat surface thereof is arranged in parallel with the direction of the generatrix of the conical surface 20. As the cutting tool 1 rotates, these cutting edges 12 cut the surface of the object. In the present invention, the cutting edges 12 of these conical surfaces 20 are used as a flat milling cutter. In addition, if these cutting blades 12 operate | move as a flat milling cutter, it is not necessary to be an insert type like the case of the top circle side, and the number of the cutting blades 12 may be changed suitably. Furthermore, the cutting blade 12 having a shape in which the cutting edge 12 of the top circular surface 10 and the cutting edge 12 of the conical surface 20 are integrally formed without providing the cutting edge 12 separately may be used. One cutting blade 12 may be configured by arranging a plurality of ready-made cutting blades in parallel on the top circular surface 10 or the conical surface 20. Further, the angle θ is not limited to 45 degrees, and may be changed as appropriate.

The support device (not shown) includes, for example, the cutting tool 1, the rotary shaft 40, and the drive device as a cutting device, and a support arm that supports the cutting device, and the support arm using a hydraulic cylinder, front and rear, left and right, You may implement | achieve by comprising so that a movement adjustment is possible in an up-down direction.
The driving device generates a rotational force, and this rotational force is transmitted to the cutting tool 1 via the rotational shaft 40. Then, as the tool body rotates, the cutting blades 12 disposed on the top circular surface 10 and the conical surface 20 rotate, and the object is cut by contacting the object as it is.

FIG. 3 is a view for explaining the positional relationship between the cutting tool 1 and the slab 50 in the present invention.
As shown in FIG. 3, the cutting tool 1 is disposed so that the top circular surface 10 side faces the end surface of the slab 50 while keeping the rotation shaft 40 horizontal. When the moving direction of the cutting tool 1 is indicated, as shown by a triaxial arrow in FIG. 3, the slab 50 side is opposed to the front side and the opposite side is the rear side as opposed to the end surface of the slab 50. Moreover, let the width direction of the slab 50 end surface be right and left. Moreover, when showing the rotation direction of the cutting tool 1, clockwise and counterclockwise are defined as shown by the semicircle arrow in FIG.
A fixing device (not shown) that can fix the slab 50 from above or from the side may be provided on the transfer table 60. After the slab 50 is conveyed to the predetermined position, the position is surely fixed by such a fixing device, so that the welded material described later can be efficiently removed.

(Operation of cutting tool)
Next, the operation of the cutting tool 1 according to the present invention will be described. First, the operation on the front surface 52 of the end surface of the slab 50, the operation on the upper corner portion 54 of the end surface of the slab 50, and the operation on the lower corner portion 56 of the end surface of the slab 50 will be described individually. Then, a series of cutting operation | movement with respect to the whole slab 50 end surface based on embodiment of this invention is demonstrated.

The “front” of the end surface of the slab 50 used in the present specification is a cut surface that appears when gas is cut from the slab, and is a substantially vertical surface when the end surface of the slab 50 is viewed from the front. The “upper corner portion” of the end surface of the slab 50 is a region including the upper end portion including the upper side on the end surface of the slab 50 and the end portion including the upper side on the upper surface 53 of the slab 50 in contact with the upper side. When the welded material adheres to the upper corner portion, the welded material often adheres on the upper surface 53 over a range of a length of about 50 mm or less from the end surface of the slab 50 toward the slab 50 side. Similarly, the “lower corner portion” is a region including a lower end portion including a lower side on the end surface of the slab 50 and an end portion including the lower side on the lower surface 57 of the slab 50 in contact with the lower side. When the welded material adheres to the lower corner portion, the welded material often adheres on the lower surface 57 over a range of approximately 50 mm or less from the end surface of the slab 50 toward the slab 50 side.
Therefore, when cutting the front surface of the end surface of the slab 50 as described later, the position of the upper corner portion 54 or the lower corner portion 56 after cutting is the same as that of the front surface of the slab 50 end surface. It will retreat to the center side.

  4 (a) to 4 (c) are diagrams for explaining each operation constituting the embodiment of the present invention in plan view. Moreover, in each figure, in the left-right direction of the slab 50, let the side which the cutting tool 1 approaches in order to start cutting be an entrance side, and let the side which ends after cutting complete | separate be an exit side. In the following text, the following drawings are also referred to as appropriate in order to describe the operation in detail.

(Operation of face milling the front of the slab end face)
Fig.4 (a) is a figure explaining the operation | movement which cuts face milling by planar view. First, the cutting tool 1 is advanced as shown by an arrow α1 in the figure, and is slightly outward from the left side of the end face of the slab 50, and as shown in FIG. The cutting tool 1 is arranged at a position that overlaps the height of the front surface 52 of the end face of the slab 50. As shown in FIG. 4A, this position is such that the top circular surface 10 and the front surface 52 of the end surface of the slab 50 are substantially on the same plane. And if the cutting tool 1 is moved rightward as it is, the cutting edge 12 arrange | positioned at the top circular surface 10 is a position which cuts the front 52 of the slab 50 end surface. In the figure, the left side is the entry side and the right side is the exit side.

  And while rotating the cutting tool 1, as the arrow (alpha) 2 in a figure shows, it moves rightward toward the front surface 52 of the slab 50 end surface. Then, the cutting edge 12 of the top circular surface 10 rotating with the rotating shaft 40 being horizontal is brought into contact with the front surface 52 of the end surface of the slab 50. And the front of the end face of the slab 50 as indicated by an arrow α3 in the figure while finely adjusting the cutting tool 1 appropriately in the front-rear, left-right, and up-down directions according to the location where the weld remains and the shape of the weld. 52 is moved rightward. And the welding thing adhering to the front 52 of the slab 50 end surface is front-milled (A process).

  Then, the cutting tool 1 that has moved from the right side of the end surface of the slab 50 to the exit side, which is slightly outward, retreats from the end surface of the slab 50 as indicated by an arrow α4 in the drawing. The entrance side and the exit side are interchanged with each other, the cutting tool 1 is entered from the outside right side of the end face of the slab 50 in the figure, and then face milling is performed while moving to the left, and finally the left side of the end face of the slab 50 is finished. The order of exiting from the outside may be used.

The state of the front surface 52a of the end surface of the slab 50 cut in this way is shown in FIG. The dotted line in FIG. 5 has shown the outline of the slab 50 end surface before A process is performed. FIG. 6 is an enlarged view of a portion indicated by a circle in FIG. FIG. 6 is an enlarged view of a part of the lower corner portion 56 in the front face 52a of the end face of the slab 50 that has been face milled.
By this face milling, the welded material is cut by the rotation of the cutting tool 1 such that the cutting edge 12 is scraped off from the end face of the slab 50, and therefore the upper corner portion 54 of the cut end face of the slab 50. Alternatively, a new cutting burr 70 is generated in the lower corner portion 56. As shown in FIG. 6, a new cutting burr 70 is formed in the lower corner portion 56 in a pattern in which a shape that hangs downward is continuous in the left-right direction.

  When this new cutting burr 70 is generated in the upper corner portion 54 of the front face 52a of the end face of the slab 50 that has been face milled, as opposed to the case of FIG. 6, it is knocked off or scooped up by the B process described later. To be cut. Moreover, when it arises in the lower corner | angular part 56 of the front surface 52a of the end surface of the slab 50 by which front face milling was carried out like FIG. 6, it is knocked down or scooped up by the C process mentioned later and cut.

(Operation to flat mill the upper corner)
FIG. 4B is a diagram for explaining the operation of flat milling the upper corner portion 54 in a plan view.
First, the cutting tool 1 is advanced as shown by an arrow β1 in the figure, and is slightly outward from the left side of the end face of the slab 50, and as shown in FIG. The lower side height is arranged so as to overlap the height of the upper corner portion 54. As shown in FIG. 4B, this position is a position where the cutting blade 12 disposed on the lower side of the conical surface 20 cuts the upper corner portion 54 if the cutting tool 1 is moved rightward as it is. It is.

  Then, while the cutting tool 1 is rotated, the cutting tool 1 is moved rightward toward the upper corner portion 54 as indicated by an arrow β2 in FIG. Then, the cutting edge 12 disposed on the conical surface 20 rotating with the rotating shaft 40 kept horizontal is brought into contact with the upper corner portion 54. Then, according to the location where the welded material remains and the shape of the welded material, the cutting tool 1 is finely adjusted in the front and rear, left and right, and up and down directions, as indicated by the arrow β3 in the figure, as shown by the arrow β3 in the slab 50 end surface. Move to the right on the upper corner 54. Then, the weld deposit remaining on the upper corner portion 54 or a new cutting burr 70 generated by the process A is cut (process B).

  Then, the cutting tool 1 that has moved from the right side of the end surface of the slab 50 to the exit side, which is slightly outward, retreats from the end surface of the slab 50 as indicated by an arrow β4 in the drawing. The entry side and the exit side are interchanged, and the cutting tool 1 is entered from the outside right side of the end face of the slab 50 in the drawing, and then flat milling is performed while moving to the left, and finally, the left side of the end face of the slab 50 is left. The order of exiting from the outside is the same as in the case of face milling.

  The operation of flat milling the upper corner portion 54 in this way is an operation of cutting the upper corner portion 54 using the lower half side of the conical surface 20. Then, by this flat milling, the cutting tool 1 cuts by cutting or scooping up the welded material while moving in the left-right direction at the upper corner portion 54. Therefore, almost all of the new cutting burrs 70 generated by the process B can be removed except those generated at the moving end portion in the left-right direction of the cutting tool 1.

(Operation to flat mill the lower corner)
FIG. 4C is a view for explaining the operation of flat milling the lower corner portion 56 in a plan view.
First, the cutting tool 1 is advanced as shown by an arrow γ1 in the figure, and is slightly outward from the left side of the end face of the slab 50, and as shown in FIG. Is arranged at a position where the height of the upper side overlaps the height of the lower corner portion 56. As shown in FIG. 4C, this position is a position where the cutting blade 12 disposed on the upper side of the conical surface 20 cuts the lower corner portion 56 if the cutting tool 1 is moved rightward as it is. .

  Then, while the cutting tool 1 is rotated, the cutting tool 1 is moved rightward toward the lower corner portion 56 as indicated by an arrow γ2 in the drawing. Then, the cutting edge 12 disposed on the conical surface 20 rotating with the rotating shaft 40 kept horizontal is brought into contact with the lower corner portion 56. Then, according to the location where the welded material remains and the shape of the welded material, the cutting tool 1 is finely adjusted appropriately in the front-rear, left-right, and vertical directions, as indicated by the arrow γ3 in the drawing, Move to the right on the lower corner 56. Then, the weld deposit remaining on the lower corner portion 56 or a new cutting burr 70 generated by the A process is cut (C process).

  Then, the cutting tool 1 that has moved from the right side of the end face of the slab 50 to the exit side, which is slightly outward, retreats from the end face of the slab 50 as indicated by an arrow γ4 in the drawing. The entry side and the exit side are interchanged, and the cutting tool 1 is entered from the outside right side of the end face of the slab 50 in the drawing, and then flat milling is performed while moving to the left, and finally, the left side of the end face of the slab 50 is left. The order of exiting from the outer side may be the same as in the other cutting operations described above.

  Thus, the operation of flat milling the lower corner portion 56 is an operation of cutting the lower corner portion 56 using the upper half side of the conical surface 20. By this flat milling, the cutting tool 1 cuts the welded material by knocking down or scooping it up while moving in the left-right direction at the lower corner portion 56. Therefore, the new cutting burr | flash 70 which arises by this C process can remove substantially all except what is produced in the movement termination | terminus part of the left-right direction of the cutting tool 1 similarly to B process mentioned above.

  FIG. 7 is a plan view when the cutting tool 1 is disposed obliquely with respect to the end surface of the slab 50. In the cutting operation according to the present invention, when the slab 50 has been transported on the slab transport table 60, as shown in FIG. In some cases, the top circle surface 10 is inclined. At this time, the cutting edge 12 of the top circular surface 10 in the face milling is rotated while its position is switched between a position close to the end face of the slab 50 and a position far from it. Therefore, the cutting blade 12 that rotates in this way cuts the end surface of the slab 50 when it appears at a position close to the end surface of the slab 50. As will be described later, in the face milling operation in the present specification, the slab is used in the cutting edge 12 disposed on the top circular surface 10 in association with the case where the cutting tool 1 moves in the left-right direction. The state of the cutting blade 12 appearing at a position close to the 50 end face is distinguished as the pre-movement side or the post-movement side. For example, in the case of FIG. 7, when the cutting tool 1 moves in the downward arrow direction in the drawing (left to right direction with respect to the end face of the slab 50), the cutting edge 12a appearing at a position close to the end face of the slab 50 It is assumed that the state is “side”. On the other hand, when the cutting tool 1 moves in the right-to-left direction with respect to the end surface of the slab 50 in the positional relationship shown in FIG. 7, the cutting edge 12a that appears near the end surface of the slab 50 is Suppose that it is in a state.

  As described above, when the end face of the slab 50 is face milled by the A process and a new cutting burr 70 is generated in the upper corner portion 54, the new cutting burr 70 is performed by performing the B process after the A process. Can be removed. Note that it is not always necessary to perform the B process immediately after the A process, and the new cutting burr 70 can be removed even if the C process is sandwiched between the A process and the B process.

Similarly, when the end face of the slab 50 is face milled by the A process and a new cutting burr 70 is generated in the lower corner portion 56, the C cutting process is performed after the A process to perform the new cutting burr 70. Almost all can be removed. In addition, it is the same as that of the above about the point which does not need to perform C process immediately after A process.
FIG. 8 is a diagram showing the state of the front surface 52a, the upper corner portion 54a, and the lower corner portion 56a of the end surface of the slab 50 after the step A is performed using the embodiment of the present invention and the step B and the step C are performed. . The dotted line in FIG. 8 shows the outline of the end surface of the slab 50 before the welded material removing method according to the present invention is performed. At this time, as described above, the new cutting burr 70 generated by the step A is not substantially illustrated, but substantially all of the upper corner portion 54a and the lower corner portion 56a are removed.

(A series of cutting operations for the entire slab end face)
Next, a series of cutting operations according to the embodiment of the present invention will be described. In the present embodiment, the three A to C steps described above are performed in the order of B → A → C or C → A → B. Whether the order of B → A → C or the order of C → A → B is determined by the position of the cutting burr 70 newly generated during face milling. Table 1 shows a table for explaining the position of a cutting burr 70 newly generated during face milling.

As shown in Table 1,
(A) The moving direction in the left-right direction of the cutting tool 1 used for face milling is either “left → right” or “right → left”. (B) The rotational direction of the cutting tool 1 used for face milling is “ Either “clockwise” or “counterclockwise” (c) The state of the cutting edge 12a that appears near the end face of the slab 50 is either “before moving” or “after moving”. According to the three combinations (a) and (c), the position of the newly generated cutting burr 70 is determined as the upper corner portion 54 or the lower corner portion 56.

  Next, an operation for actually cutting the end face of the slab 50 will be described. FIG. 9 is a diagram illustrating a series of cutting operation steps in the embodiment of the present invention. In FIG. 9, the cutting blade 12 of the cutting tool 1 is omitted for the sake of clarity. Also, during each process, the operation of the cutting tool 1 entering from slightly outside from the left and right sides of the end face of the slab 50 and the operation of exiting from slightly outside from the other sides of the left and right are omitted.

First, the cutting tool 1 used in this embodiment is always rotated clockwise. Moreover, let the left side of the cutting tool 1 be a position close | similar to the end surface of the slab 50, as shown in FIG. As will be described later, in this operation, the steps A, B, and C are performed in the order of C → A → B.
First, the cutting tool 1 is advanced and entered from the right side of the end face of the slab 50 so that the height above the conical surface 20 overlaps the height of the lower corner portion 56. Then, the cutting tool 1 is moved to the left as it is. Thereafter, as shown in FIG. 9A, the upper side of the conical surface 20 of the cutting tool 1 is brought into contact with the right end of the lower corner portion 56 to start flat milling. The lower corner portion 56 is flat milled while moving the cutting tool 1 toward the left end of the lower corner portion 56 of the slab 50 end face. Thereby, the weld deposits remaining on the lower corner portion 56 are removed (step C).

  When the C process is completed, the cutting tool 1 reaches slightly outward from the left side of the lower corner portion 56 of the slab 50 end face. From here, the cutting tool 1 is moved slightly upward and arranged slightly outward from the left side of the front surface 52 of the end face of the slab 50. At this position, the cutting edge 12 disposed on the top circle surface 10 and the front surface 52 of the end surface of the slab 50 are substantially on the same plane.

  Next, the cutting tool 1 is moved rightward from this position. Thereafter, as shown in FIG. 9B, the top circular surface 10 of the cutting tool 1 is brought into contact with the left end of the front surface 52 of the end surface of the slab 50, and the front milling is started. Then, while the cutting tool 1 is moved toward the right end of the front face 52 of the slab 50 end face, the front face 52 of the slab 50 end face is face milled. As a result, the welded material remaining on the front surface 52 of the end surface of the slab 50 is removed (step A). However, as shown in FIG. 9C, a new cutting burr 70 as described above is generated at the upper corner portion 54 of the end surface of the slab 50.

Here, in the face milling in the present embodiment, the moving direction of the cutting tool 1 in the left-right direction is “left → right”, the rotation direction of the cutting tool 1 is “clockwise”, and the state of the cutting edge 12 is Corresponds to the case (2) shown in Table 1. As shown in Table 1, a new cutting burr 70 is generated in the upper corner portion 54.
When this step A is completed, the cutting tool 1 reaches slightly outward from the right side of the front surface 52 of the slab 50 end face. From here, the cutting tool 1 is moved slightly upward and arranged slightly outward from the right side of the upper corner portion 54. At this position, the lower height of the conical surface 20 overlaps the height of the upper corner portion 54.

  Next, from this position, as shown in FIG. 9C, the lower end of the conical surface 20 of the cutting tool 1 is brought into contact with the right end of the upper corner portion 54 of the end surface of the slab 50 to start flat milling. Then, the upper corner portion 54 is flat milled while moving the cutting tool 1 toward the left end of the upper corner portion 54 of the slab 50 end face. In this flat milling cutting process, the weld deposit remaining on the upper corner portion 54 and the new cutting burr 70 generated in the immediately preceding A process are simultaneously removed. (Step B).

  When the B process is completed, the cutting tool 1 reaches slightly outward from the left side of the upper corner portion 54 of the end surface of the slab 50. Then, the cutting tool 1 retreats from the end surface of the slab 50 and retreats slightly outward from the left side of the end surface of the slab 50. In this way, a series of operations of the embodiment of the present invention performed in the order of C → A → B with respect to one end face of the slab 50 ends. Then, as shown in FIG. 9D, the end face of the slab 50 having the face milled 52a, the flat milled upper corner portion 54a and the lower corner portion 56a is obtained.

  Thereafter, the slab 50 is transported for the next processing, another subsequent slab 50 is transported before the cutting tool 1, and the same operation is repeated on the end surface in the above-described procedure. At this time, as described above, the C process may be started from the right side of the lower corner portion 56 of the end surface of the slab 50, or the left side of the upper corner portion 54 of the end surface of the slab 50 at the time when the B step is completed is set as the start position. You may start from the B process. In this case, the procedure of B → A → C is reversed to the procedure of C → A → B described above, and in the horizontal direction of the cutting tool 1 in each process shown in FIG. 9 and in the vertical direction when switching between the processes. The movement direction may be reversed. However, at this time, when the rotation direction of the cutting tool 1 remains clockwise and the cutting blade 12 appearing at a position close to the end face of the slab 50 is on the movement front side, it corresponds to the case (5) shown in Table 1. A new cutting burr 70 is generated at the upper corner portion 54. Therefore, it is necessary to perform the process B again as it is.

  Therefore, it is only necessary to change the rotation direction of the cutting tool 1 counterclockwise and set the cutting edge 12 appearing at a position close to the end face of the slab 50 to the front side (corresponding to the case (7)). Alternatively, the cutting blade 12 appears at a position close to the end face of the slab 50 with the rotation direction of the cutting tool 1 kept clockwise and the direction in which the circular top surface of the cutting tool 1 is inclined is opposite to the direction shown in FIG. It may be the rear side (corresponding to case (6)). By doing in this way, in the flat milling in the C process performed at the end, the weld deposit remaining on the lower corner portion 56 and the new cutting burr 70 generated in the A process immediately before that can be removed simultaneously. it can.

In addition, each case of (1)-(8) shown in Table 1 is as follows to each case of (a)-(h) of Claim 3 and Claim 4 in a claim. It corresponds.
Case (1) ... Case (a)
Case (4) ... Case (b)
Case (6) ... Case (c)
Case (7) ... Case (d)
Case (2) ... Case (e)
Case (3) ... Case (f)
Case (5) ... Case (g)
Case (8) ... Case (h)

  In addition, after a series of operation | movement by this embodiment is complete | finished, for example, after rotating the slab 50 90 degree | times, the left-and-right side surfaces 55 and 55 are made into an end surface, and the welding material which remains on the said end surface is similarly applied. The removal work may be continued. In addition, the steps A to C are not only performed once in the left-right direction, but are repeated two or more times by returning a certain step among the three steps according to the progress of the removal operation. It is good as well. However, with respect to the position of the newly generated cutting burr 70, the moving direction in the left-right direction of the cutting tool 1 when the face milling is performed (the above (A)), the rotational direction of the cutting tool 1 (the above (A)), and the end face of the slab 50. It is necessary to make a series of operations in consideration of the state of the cutting blade 12 appearing at a position close to ((c)).

(Effect of embodiment)
In the embodiment of the present invention, first, one of the upper corner portion 54 and the lower corner portion 56 of the end surface of the slab 50 is flat milled using the conical surface 20 of the cutting tool 1, and then the cutting tool 1 is slightly moved downward or upward. The front surface 52 of the end surface of the slab 50 is face milled, and then the cutting tool 1 is continuously moved slightly downward or upward, and the other of the upper corner portion 54 or the lower corner portion 56 of the end surface of the slab 50 is moved. Is flat milled using the conical surface 20 of the cutting tool 1. Therefore, the weld deposits remaining on the end surface of the slab 50 and the new cutting burr 70 generated by the cutting are efficiently removed in a series of non-stagnation procedures from the top to the bottom or from the bottom to the top of the slab 50. be able to.

  Therefore, even if it is the single cutting tool 1, since the welded material of the slab 50 end surface can be processed rapidly, the conveyance efficiency of the slab 50 can be improved and production efficiency can be improved. This is particularly effective for a line to which a hot charge rolling process is applied, which is frequently used in recent years, in which the continuous casting slab 50 is charged and rolled in a heating furnace at a high temperature without being cooled to room temperature. That is, it is possible to provide a suitable technique for the problem that the welded material on the end face of the slab 50 must be removed quickly.

  Moreover, the end surface welded material removal method of the continuous cast slab according to the present invention can be performed before or after the slab 50 is charged into a heating furnace for hot rolling. However, when performing after inserting the slab 50 in a heating furnace, it becomes necessary to heat-treat the cutting tool 1 etc. with respect to the slab 50 whose temperature rose more. Moreover, the time for performing the end surface welded material removal method of the continuous casting slab according to the present invention is a time loss until the hot rolling process is started after the slab 50 is taken out of the heating furnace, and the rolling process is performed. There is a concern that the temperature of the slab 50 may decrease. Therefore, it is preferable to perform the end surface welded material removal method of the continuous casting slab according to the present invention before the slab 50 is charged into the heating furnace.

DESCRIPTION OF SYMBOLS 1 Cutting tool 10 Top circular surface 12, 12a Cutting edge 20 Conical surface 30 Bottom circular surface 40 Rotating shaft 50 Slab 52, 52a Front surface 54, 54a Upper corner part 56, 56a Lower corner part 60 Slab conveyance table 70 Cutting burr | theta (theta) angle

Claims (4)

A method of removing weld deposits remaining on an end surface of the slab by gas cutting or scurfer cutting of the slab in a continuous casting slab conveyance line,
A plurality of cutting blades are arranged along the circumferential direction on the top circular surface of the frustoconical tool body so that the top circular surface side is a front milling cutter, and the conical surface of the tool body is along the circumferential direction. Using a cutting tool in which a plurality of cutting blades are arranged and the conical surface side is a flat milling cutter,
With the rotational axis of the tool horizontal, the top circular surface side is opposed to the slab end surface as the front side, the opposite side is the rear side, and the width direction of the slab end surface is the left and right. The slab end face to which the cutting burr generated by the A process is attached after the A process is first performed among the following processes A to C. A method of removing an end surface welded material from a continuous cast slab, wherein the corresponding B or C step is performed on at least one of the upper corner portion and the lower corner portion of the slab.
A: While rotating the tool with respect to the front surface of the slab end surface, the top circular surface side is brought into contact with the slab end surface, and the slab end surface is moved while moving the tool back and forth, right and left, and up and down. Front milling process B in which front milling is performed by cutting the front surface and cutting the welded material. The lower corner of the conical surface is brought into contact with the upper corner while rotating the tool with respect to the upper corner, and the tool is moved. The upper corner portion machining step C, in which the upper corner portion is flat-milled while moving in the front-rear, left-right, and up-down directions, and the weld deposit remaining on the upper corner portion or the cutting burr generated in the step A is cut. While rotating the tool with respect to the lower corner portion, the upper side of the conical surface is brought into contact with the lower corner portion, and the lower corner portion is flat milled while moving the tool back and forth, left and right, and up and down. , Weld remaining on the lower corner Or lower corner machining step of cutting the cutting burrs caused by the A step   Furthermore, when the cutting tool is arranged to be tilted to the left and right with respect to the slab end surface while keeping the rotation axis horizontal, the movement direction of the tool in the left and right directions among the plurality of cutting blades arranged on the top circular surface The end surface welded material removal method of the continuous casting slab according to claim 1, wherein the step A is performed using either a cutting blade on the front side or a cutting blade on the rear side. In the end surface welded material removal method of the continuous casting slab of Claim 2,
The combination of the rotation direction of the tool with respect to the slab and the state of the cutting edge used in the step A at that time in the case where the right and left movement direction of the tool is the following I is the following (a) or (b) And when
The combination of the rotation direction of the tool with respect to the slab and the state of the cutting blade used in the step A at that time in the case where the left and right moving directions of the tool are the following II is the following (c) or (d) When
The method of removing an end face weld from a continuous casting slab, wherein the three steps are performed in the order of a B step, an A step, and a C step.
I: When the left and right movement direction of the tool is from left to right (a) When the rotation direction is clockwise and the cutting blade used is the front side of movement (b) The rotation direction is counterclockwise and the cutting used When the blade is in the rear side
II: When the right / left movement direction of the tool is from right to left (c) When the rotation direction is clockwise and the cutting edge to be used is after movement (d) The rotation direction is counterclockwise and used When the cutting edge is in the pre-movement state In the end surface welded material removal method of the continuous casting slab of Claim 2,
The combination of the rotation direction of the tool with respect to the slab and the state of the cutting blade used in the step A at that time when the lateral movement direction of the tool is III is as follows (e) or (f) And when
The combination of the rotation direction of the tool with respect to the slab and the state of the cutting blade used in the step A at that time when the left and right movement direction of the tool is IV is as follows (g) or (h) When
The method for removing an end face weld from a continuous cast slab, wherein the three steps are performed in the order of a C step, an A step, and a B step.
III: When the left / right movement direction of the tool is from the left side to the right side (e) When the rotation direction is clockwise and the state of the cutting edge to be used is the moved side (f) The rotation direction is counterclockwise and is used When the cutting edge is in the pre-movement state
IV: When the right and left movement direction of the tool is from right to left (g) When the rotation direction is clockwise and the cutting edge used is the front side of movement (h) The rotation direction is counterclockwise and the cutting used When the blade is in the rear side

Images