JP2008183609A - Cut slag removing device of beam blank slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the cut slag removing device of a beam blank slab which has sufficient strength for removing firmly deposited cut slag, and which is made compact, and whose maintenance can be easily carried out, and which can remove the cut slag of the beam blank slab even when the beam blank slab is conveyed while it is deviated from the cut slag removing device. <P>SOLUTION: The cut slag removing device 1 comprises a main cutting tool 2 having a shape to be fitted to the cut section recess 13d of a beam blank slab 13, a preceding cutting tool 3 which is mounted on the main cutting tool and vertically slidable, a push-up member 4 for upwardly projecting the preceding cutting tool with respect to the main cutting tool, a tool rest 5 to mount the main cutting tool slidably in the width direction, a restoring member 6 for restoring the main cutting tool to the center position of the tool rest, and an elevating/lowering device 7 for vertically moving the tool rest. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for removing cutting blades generated at the end of a cut surface when a beam blank cast is gas cut.

  When slabs manufactured by continuous casting (slab slabs, bloom slabs, beam blank slabs, billet slabs, etc.) are discharged from the continuous casting machine, they are cut from a continuous state to a predetermined length. There is a need. As a cutting method in this case, gas cutting is generally used because the slab is hot and the cutting thickness is thick. When a gas jet is blown from the upper part by a fusing method such as gas cutting, a part of the molten slab solidifies at the lower part of the cut surface to form a cutting noro (also called “cutting burr” or “cutting sagging”). Adhere to.

  This cutting blade contains a metal part, and if the cutting blade is rolled while attached to the slab, it may be caught on the back surface of the rolled steel sheet or damage the rolling roll. Therefore, it causes surface flaws of the rolled steel material and degrades the quality of the steel product. Therefore, the cutting blade needs to be removed before the rolling process.

  When the cut surface of the slab is a quadrilateral shape, it is possible to remove the cutting blade by cutting with a flat blade, but when the cutting surface such as a beam blank slab or a round billet slab is not a quadrilateral shape, When the corner is rounded, the cutting blade cannot be completely removed by cutting with a flat blade.

  Therefore, as a conventional technique for removing cutting blades when the cut surface is not a quadrilateral shape, a method of removing by impact with a rotary hammer (see, for example, Patent Document 1) or a plurality of cutting tools divided in the slab width direction A removal method (see, for example, Patent Document 2) has been proposed.

In the removal method using a rotary hammer, a plurality of rotary hammers having respective hammer lengths matched to the shape of the cut surface are arranged in the width direction of the slab and the cutting surface recesses such as beam blank slabs are removed. On the other hand, in the method of removing with a plurality of cutting tools divided in the width direction, the cutting surface recesses such as the beam blank slab are removed by a plurality of cutting tools arranged in the width direction of the slab that can be moved up and down independently. Is.
JP-A-4-270043 JP 58-217213 A

  However, when the prior art is applied to a beam blank cast, the prior art has the following problems.

  In other words, in Patent Document 1, the hammer rotation diameter is required to be greater than a certain value in order to obtain a predetermined striking force, and the vertical height direction with respect to the hammer rotation stroke (radius) required on the upper side of the rotation shaft. In addition, it is necessary to secure a double space both in the longitudinal direction of the slab and the slab length, and the installation position is limited because a wide installation space is required. In addition, since a large number of rotating hammers are provided, time is spent on maintenance. Further, it is necessary to disperse the cutting blades removed by the rotation, and there is also a problem that the wear of the hammer is severe due to the impact load.

  Further, in Patent Document 2, the split bite is spread so as to abut against the left and right flange portions of the beam blank slab. Therefore, a gap is generated in the split bit at the center part of the slab so that the split bite does not come into contact with the cutting tool. There is a problem that it cannot be removed. Also, not only the beam blank slab, but the slab is not always transported to the center of the cutting blade removing device, and may be shifted to the left and right in the width direction of the cutting blade removing device. In the case of a large deviation with respect to the apparatus, the divided bit does not come into contact with a predetermined position, and a portion where the cutting blade is not removed occurs. Furthermore, there is a problem that a complicated mechanism is required to follow the shape of the beam blank slab.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to have a strength sufficient to remove the cutting stick firmly attached, and the equipment is small and easy to maintain. Also provided is a beam blank cast severing removal device capable of removing the beam blank slab cutting nose even if the beam blank slab is conveyed while being shifted with respect to the cutting blade removing device. It is to be.

  In order to solve the above-described problems, a cutting tool for removing a beam blank cast according to the present invention includes a main bit having a shape that fits into a cut surface recess of the beam blank cast, and a main bit attached to the main bit. A leading bit capable of sliding in the vertical direction with respect to the bite, a push-up member for projecting the leading bit upward with respect to the main bite, a cutter base on which the main bite is slidable in the width direction, and the main bite It comprises a restoring member that restores the cutting tool to the center position of the tool pedestal, and an elevating device that moves the tool pedestal vertically.

  According to the cutting blade removing device according to the present invention having the above-described configuration, even when the beam blank cast piece is transported greatly away from the center position of the cutting blade removing device, the main bit follows the beam blank cast piece and has a width. Since it moves to a direction and it fits into the cut surface recessed part of a beam blank slab, it can remove, without leaving the cutting sticker adhering to a cut surface. This eliminates the need for a side guide device for centering the beam blank cast. In addition, the structure of the cutting blade removing device is simple, and the maintenance is easy.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a cutting blade removing device for a beam blank cast according to the present invention. In FIG. 1, the beam blank cast 13 is also illustrated, and the positional relationship between the cutting blade removing device 1 according to the present invention and the beam blank cast 13 is also displayed.

  As shown in FIG. 1, a beam blank cast slab 13 which is a material such as H-shaped steel or I-shaped steel is formed by flange portions 13a on both sides and a central web portion 13b, and the lowermost end portion 13c of the cut surface of the flange portion 13a. In addition, a cutting blade (not shown) generated at the time of gas cutting adheres to the cut surface recess 13d formed by the flange portion 13a and the web portion 13b. The beam blank slab 13 is transported on the transport line by bringing the lowest cut end portions 13c on both sides into contact with a transport roll (not shown) provided on the slab transport line. In FIG. 1, reference numeral 9 is a so-called pass line connecting the upper surface positions of the respective transport rolls.

  The cutting blade removing apparatus 1 according to the present invention for removing the cutting blade adhering to the beam blank cast 13 conveyed in this manner is closely attached to the cut surface recess 13d of the beam blank casting 13 and fitted. A main bit 2 having an outer shell shape, a leading bit 3 attached to the main bit 2 and capable of sliding in the vertical direction with respect to the main bit 2, and the leading bit 3 with respect to the main bit 2 A push-up member 4 installed on the main tool 2 for projecting upward, a cutter base 5 to which the main tool 2 is slidable in the width direction, and the main tool 2 are restored to the center position of the tool base 5. For this purpose, a restoring member 6 attached to the tool pedestal 5 and an elevating device 7 for moving the tool pedestal 5 in the vertical direction are provided.

  The leading bit 3 is for guiding the main bit 2 to the cut surface recess 13d. Therefore, the leading bit 3 has a narrow upper end so that the leading bit 3 itself can easily enter the cut surface recess 13d. It has a shape. In this case, the sliding members such as the main cutting tool 2 and the leading cutting tool 3 are supported by a guide (not shown), and the blade base 5 that moves in the vertical direction is also supported by a guide (not shown). Although these sliding surfaces have damping due to friction, if necessary, other damping elements such as a fluid dash pod can be added.

  The push-up member 4 constantly pushes up the leading bit 3 until the stroke end of the sliding range, and contracts by an external force exceeding a certain value, and does not require complicated control. Similarly, the restoring member 6 restores the main cutting tool 2 to the center position of the tool pedestal 5, and the restoring members 6 that exert the same force on the main cutting tool 2 are arranged on the left and right sides of the main cutting tool 2. That's fine. However, when an external force of a certain value or more is applied to the main bit 2, it is necessary to adjust the force by the restoring member 6 so that the main bit 2 can slide in the direction of the external force.

  In FIG. 1, a spring is employed as the push-up member 4 and the restoring member 6, but not only an elastic body such as a spring but also a fluid cylinder, an electromagnet, a load-sensitive electric screw, or the like can be used. However, in terms of structure and durability, the push-up member 4 is preferably a compression spring, and the restoring member 6 is preferably a compression spring or a tension spring.

  Next, a method of removing the cutting blade attached to the beam blank cast piece 13 using the cutting blade removing apparatus 1 according to the present invention having such a configuration will be described with reference to the drawings.

  FIG. 2 is a schematic view showing the operation of the cutting blade removing apparatus according to the present invention. In FIG. 2, it is assumed that the beam blank slab 13 is conveyed far from the center of the main cutting tool 2 of the cutting blade removing device 1. As shown in FIG. 2, when the beam blank cast slab 13 is transported away from the center of the main cutting tool 2 of the cutting blade removing device 1, the main cutting tool 2 is moved so as to follow the cut surface recess 13 d. There is a need.

  First, as shown in FIG. 2A, the tool pedestal 5 is raised by the lifting device 7. In this case, the tool pedestal 5 is moved only in the vertical direction by the lifting device 7, the width direction is fixed, and the main cutting tool 2 and the leading cutting tool 3 rise together with the tool pedestal 5. The leading bit 3 rises in a state of protruding from the main bit 2 to the stroke end position of the sliding range, and the upper end portion of the leading bit 3 comes into contact with the cut surface recess 13 d of the beam blank cast 13.

  When the upper end portion of the leading bit 3 comes into contact with the cut surface recess 13d of the beam blank cast 13, as shown in FIG. 2 (B), due to the component force in the width direction from the beam blank cast 13 generated in the leading bit 3, Both the leading bit 3 and the main bit 2 slide in the width direction of the blade base 5. In this case, the restoring member 6 for restoring the main cutting tool 2 to the center position of the blade base 5 is set to be sufficiently smaller than the component force in the width direction generated in the preceding cutting tool 3. When the upper end portion of the preceding cutting tool 3 comes into contact with the lowermost end portion 13c of the beam blank slab 13, the lower end portion 13c of the cutting surface is flat. The preceding cutting tool 3 does not enter the cut surface recess 13d. Therefore, when applying the cutting blade removing apparatus 1 of the present invention, it is necessary to control the conveyance of the beam blank cast slab 13 so that at least the upper end portion of the preceding cutting tool 3 is located within the range of the cut surface recess 13d.

  As shown in FIG. 2 (C), the tool base 5 is further raised by the lifting device 7, and the main bit 2 comes into contact with the cut surface recess 13d following the preceding bit 3, and the main bit 2 is moved from the beam blank cast piece 13 to the main bit 2. , The leading tool 3 and the main tool 2 both slide further in the width direction of the tool base 5.

  Then, by further raising the blade pedestal 5 by the lifting device 7, the upper end portion of the main tool 2 comes into contact with the cut surface recess 13d of the beam blank cast piece 13 as shown in FIG. The cutting tool 2 is fitted in close contact with the cut surface recess 13d. The lower end portion 13c of the cut surface is also in close contact with the flat portion of the main cutting tool 2. On the other hand, the preceding cutting tool 3 receives the downward reaction force from the beam blank cast slab 13 and is accommodated in the main cutting tool 2 so that the upper end part thereof overlaps the upper end part of the main cutting tool 2 while compressing the push-up member 4.

  In this way, with the main cutting tool 2 fitted in the cut surface recess 13d of the beam blank cast 13, the beam blank cast 13 is transported in the longitudinal direction of the transport line, or the cutting strip removing device 1 according to the present invention is used. By moving in the longitudinal direction of the transport line, all cutting blades generated at the lower part of the cutting surface of the beam blank cast 13 are removed. As a matter of course, when the beam blank cast slab 13 is moved to remove the cutting blade, the main cutting tool 2 is brought into contact with the cutting surface recess 13d before the cutting surface passes over the main cutting tool 2. Further, the main cutting tool 2 is raised immediately before passing the cut surface in order to reduce the length of the main cutting tool 2 coming into contact with the beam blank casting 13 and cutting the base material of the beam blank casting 13 as much as possible.

  The shape of the upper end portion of the preceding cutting tool 3 is a curved line having an inclination that tends to generate a component force in the width direction when it receives a downward reaction force from the beam blank cast piece 13 in contact with the beam blank cast piece 13. That is, the shape of the upper end portion of the preceding bit 3 is such that it is connected to the inclined tip shape along the cut surface recess 13d of the main bit 2 in the state of protruding from the main bit 2 to the maximum, and from the inclination angle of the main bit 2 Also tilt to the center side.

  In this case, when the length of the leading bit 3 is longer and the inclination angle is steeper, the component force in the width direction due to the reaction force from the beam blank cast 13 becomes larger, and the leading bit 3 moves in the width direction. It becomes easy. However, when the vertical length of the preceding cutting tool 3 is increased, it is necessary to increase the vertical stroke of the lifting device 7 necessary for retraction, and therefore it is preferable to set the minimum length necessary for obtaining the width direction component force. .

  FIG. 3 is a diagram showing a case where the shape of the upper end portion of the preceding cutting tool 3 is determined giving priority to the thrust force in the width direction. As shown in FIG. The position of the main cutting tool 2 in the width direction and the height direction that can enter the cutting surface recess 13d is determined, and the angle along the cutting surface recess 13d at that time is the angle of the preceding cutting tool 3 as shown in FIG. And The angle at this time is the maximum angle of the preceding cutting tool 3 from the horizontal direction.

  On the other hand, when the shape of the upper end portion of the preceding byte 3 is determined giving priority to the maximum allowable offset amount, it is determined as shown in FIG. That is, as shown in FIG. 4A, the position of the main cutting tool 2 in the width direction and the height direction that can enter the cut surface recess 13d of the beam blank cast slab 13 with only the main cutting tool 2 is determined, and the main cutting tool at this position is determined. The angle formed by the straight line connecting the intersection of the center line 2 and the cut surface recess 13d and the contact point between the main cutting tool 2 and the cut surface recess 13d is the minimum angle of the preceding cutting tool 3 from the horizontal direction. Then, as shown in FIG. 4 (B), an arc for lowering the surface pressure is provided at the tip of the leading bit 3, and this arc and the contact point between the main bit 2 and the cut surface recess 13d are smoothly connected. Thus, the shape of the upper end portion of the preceding cutting tool 3 is used.

  Due to the presence of the preceding cutting tool 3 having such a shape, the main cutting tool 2 can be guided to the center of the beam blank casting 13 even when the beam blank casting 13 is largely displaced in the width direction of the cutting blade removing device 1. It becomes possible.

  When the beam blank slab 13 or the cutting blade removing device 1 is moved in the longitudinal direction of the beam blank slab 13 to remove the cutting blade, small burrs that cannot be removed may occur in the cut surface. In such a case, the burrs can be reduced by inclining the width direction of the main cutting tool 2 with respect to the width direction of the beam blank slab 13 (this inclination angle is referred to as “skew angle”). Is possible. When the main bit 2 has a skew angle, the shape of the main bit 2 is determined so that the main bit 2 comes into close contact with the cut surface recess 13d when viewed from the longitudinal direction of the beam blank slab 13, and The shape must also be determined in the state seen from the longitudinal direction of the beam blank cast 13.

  If the main cutting tool 2 and the leading cutting tool 3 are replaced blades of separate members that can be removed only at the upper end, the maintenance becomes very easy. Moreover, since the cross-sectional shape of the beam blank cast slab 13 is substantially constant according to the specifications of the rolling mill at each rolling mill, the beam blank cast slab 13 has the shape of the cut surface recess 13d of the beam blank cast slab 13 used at the rolling mill. A main bit 2 along the line may be used.

  In the case of only the main cutting tool 2, when the beam blank cast 13 greatly deviates from the center of the cutting blade removing device 1, the upper end of the main cutting tool 2 comes into contact with the lower end 13 c of the cut surface of the beam blank casting 13. The main cutting tool 2 cannot be fitted into the cut surface recess 13d. However, in the cutting blade removing apparatus 1 according to the present invention, the leading cutting tool 3 that is slidable in the vertical direction is attached to the main cutting tool 2. Comes into contact with the beam blank cast 13 before the main bit 2 and guides the main bit 2 to the cut surface recess 13d, so that even when the beam blank cast 13 is greatly deviated from the center of the cutting blade removing device 1, It becomes possible to remove without leaving the cutting blade adhering to the cut surface. As a result, a side guide device for centering the beam blank cast slab 13 becomes unnecessary.

  In the conveying line for charging the beam blank slab into the heating furnace, the cutting blade removing device according to the present invention was installed between the conveying roller tables as shown in FIG. FIG. 5 is a schematic view showing a state in which the cutting blade removing device 1 according to the present invention is installed between the transport rolls 8 constituting the transport roller table, (A) is a plan view, and (B) is a front view. FIG.

  In the present embodiment, the tool pedestal 5 is attached to the swing arm 10, and the swing arm 10 is tilted by the lifting device 7 to raise and lower the tool pedestal 5. The swing arm 10 and the lifting device 7 are attached to a fixed base 11. A hydraulic cylinder was used as the lifting device 7. Further, a recovery shooter 12 for recovering the removed cutting blade was provided between the transport roller tables. The beam blank cast is conveyed from the right side to the left side in FIG. The main cutting tool 2 and the leading cutting tool 3 were inclined by 15 ° with respect to the cut surface of the beam blank cast as a skew angle (θ).

  The cutting blade removing device 1 is moved down, and the beam blank cast piece is conveyed by driving the conveying roll 8 so as to pass above the cutting blade removing device 1. Then, the cutter base 5 is raised by the elevating device 7 before the rearmost end which is the cut surface of the beam blank slab passes. In the ascending direction, there is a limiter at the upper limit position. Below the upper limit position, the leading bit 3 and the main bit 2 are pressed against the beam blank slab by a constant pressure of the lifting device 7. Since the limiter at the upper limit position is set slightly above the pass line 9, it can be followed even when the beam blank cast is warped upward.

  Before the end of the cut surface passed, the main cutting tool 2 was pressed against the beam blank slab, and the cutting tool was removed by the main cutting tool 2 toward the outside of the cutting surface.

  Since the main bit 2 has a skew angle (θ), the timing when the main bit 2 passes through the cut surface of the beam blank slab in the case of FIG. 5 (A) was gradually increased from the bottom to the top), and the cutting blade was also pushed in the width direction, and the amount of uncut material (burrs) perpendicular to the cut surface was reduced to less than half. The removed cutting blade dropped toward the recovery shooter 12. After passing the beam blank slab, the beam was lowered by an elevating device, and the preceding bite was returned to a predetermined position (lower limit position etc.).

  By removing the cutting blank of the beam blank slab in this way, even when the center position in the width direction of the beam blank slab is intentionally shifted by 100 mm from the center of the cutting slot removing device 1, The main bit 2 followed the center, and it was confirmed that the cutting blade was removed without any problem.

It is a schematic block diagram of the cutting blade removal apparatus which concerns on this invention. It is the schematic which shows operation | movement of the cutting blade removal apparatus which concerns on this invention. It is a figure which shows the case where the upper end part shape of a preceding bite is determined giving priority to the width direction thrust force. It is a figure which shows the case where the upper end part shape of a preceding byte is determined giving priority to the maximum allowable offset amount. It is the schematic which shows the state which installed the cutting blade removal apparatus of this invention between the roller tables for conveyance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting Noro removal apparatus 2 Main bit 3 Leading bit 4 Push-up member 5 Tool base 6 Restoring member 7 Lifting device 8 Transport roll 9 Pass line 10 Swing arm 11 Fixed mount 12 Recovery shooter 13 Beam blank cast piece 13a Flange part 13b Web part 13c Lowermost end of cut surface 13d Recess of cut surface θ Skew angle

Claims (1)

  A main bit having a shape that fits into the cut surface recess of the beam blank cast piece, a leading bit attached to the main bit and capable of sliding in the vertical direction with respect to the main bit, and the leading bit being the main bit A push-up member that protrudes upward with respect to the blade, a tool pedestal that attaches the main tool so as to be slidable in the width direction, a restoration member that restores the main tool to the center position of the tool base, and the tool base in the vertical direction. A lifting / lowering device for moving the beam blank cast slab.

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