JP4692350B2 - Steel plate end face machining method and apparatus - Google Patents

Description

  The present invention relates to a steel plate end surface machining method and apparatus for cutting a cut surface cut by a cutting device such as a side trimmer that cuts both ends of a steel plate to a specified width in a steel plate manufacturing process.

Conventionally, as a method for machining the end face of a steel sheet, the cut edge portion of the cold rolled material is crushed in the sheet width direction by a pressing roller device installed between the pickling tank and the cold rolling process, and a micro crack on the fracture surface Has been disclosed (for example, Patent Document 1).
In addition, as another method, holding a cutting tool having a rake angle α of 20 to 60 ° on both sides of the steel sheet so that the cutting edge cuts into the end face of the steel sheet, the steel sheet and the cutting tool are moved relative to each other, and both end faces of the steel sheet Has been disclosed (for example, Patent Document 2).

JP-A-56-91911 Japanese Patent No. 3691130

In the conventional method, for example, the above-described crushing method, the cut surface of the steel plate by the side trimmer is not necessarily smooth, and the cut surface on the fracture surface side including the minute cracks may be concave with respect to the shear surface. For this reason, it is difficult to completely remove microcracks, burrs, and the like on the fracture surface simply by applying a required pressing force with a roller.
Further, for example, in a cutting method performed by holding a cutting tool having a rake angle α of 20 to 60 ° on both sides of the steel plate, the rake angle of 20 to 60 ° may be maintained when the cutting edge of the cutting tool is worn. It is difficult to achieve the desired effect.

  The present invention has been made to cope with the above-described problems, and smoothes the steel plate end surface cut by a cutting device such as a side trimmer to remove minute cracks on the cut end surface, burrs on the edge portion, and the like. At the same time, it is an object of the present invention to propose a method and apparatus for machining the end face of a steel plate that can extend the tool life.

A steel plate end surface machining method according to the present invention is a steel plate end surface machining method for cutting a cut end surface cut by a cutting device that cuts both ends of a steel plate to a specified width. Is pressed and held so that the cutting edge cuts into the end face, the steel sheet is moved, and both end faces of the steel sheet are cut while rotating the circular cutting tool.
In addition, it is preferable to cut each end face using two or more circular cutting tools arranged at different angles in the thickness direction of each end face of the steel plate.
The circular cutting tool is preferably driven to rotate by the moving force of the steel plate and the cutting reaction force of the end face.

An end face machining apparatus for a steel sheet according to the present invention is an end face machining apparatus for a steel sheet that cuts a cut end face cut by a cutting apparatus that cuts both end portions of a steel sheet to a specified width, and the cutting edge is on the end face. A rotatable circular cutting tool movably arranged so as to be cut and positioning means for positioning the circular cutting tool with respect to the steel plate.
In addition, it is preferable that two or more of the circular cutting tools are disposed at different angles in the thickness direction of each end face of the steel plate.
Moreover, it is preferable that the circular cutting tool is driven to rotate by the moving force of the steel plate and the cutting reaction force of the end face plate.

According to the steel plate end surface machining method of the present invention, a rotatable circular cutting tool is pressed and held so that the cutting edge cuts into the end face, the steel plate is moved, and the circular cutting tool is rotated while rotating the circular cutting tool. By cutting both end faces of the steel plate, the end face of the steel plate can be smoothed to remove minute cracks and the like, and the circular tool can be prevented from generating heat and its life can be extended.
In addition, by using two or more circular cutting tools arranged at different angles in the thickness direction of each end face of the steel plate, cutting each end face realizes machining that does not generate burrs on the end face edge portion. it can.
Furthermore, by using a circular tool with a driven rotating structure, it is not necessary to provide a separate drive device, so that inexpensive equipment can be provided.

  Moreover, the end surface machining of the steel plate of the present invention contributes to the achievement of each effect described in the above method by being used in the above method.

Embodiments of the present invention will be described below with reference to the drawings. The steel plate end surface machining apparatus according to the present invention can be applied to, for example, a pickling and cold rolling continuous line. FIG. 1 is a view showing an example of a pickling and cold rolling continuous line of a steel plate provided with an end face machining apparatus according to the present invention. The pickling and cold rolling continuous line in FIG. 1 is a coiled hot rolled steel plate manufactured by hot rolling a thick plate slab having a thickness of about 200 mm to about 4 mm by a hot rolling mill in the previous manufacturing process. The hot rolled steel sheet 1a fed from the feeding end 2 is pickled through the pickling tank 3 which is a pickling treatment process for removing scales generated in the hot rolling process. After that, it is cut to a specified width by the side trimmer 4. Thereafter, the cut end face of the steel plate 1a is smoothed by the end face machining device 5 for cutting the cut end face cut by the side trimmer 4, and further cold-rolled by the cold rolling mill group 6, so that the steel plate 1a has a plate thickness of 1 mm. This is a step of manufacturing a cold-rolled coil by making a cold-rolled steel sheet 1b of a certain degree and then winding it on the winding end 7.
The cold-rolled coil is moved to the next process according to the shipment type, and subjected to continuous annealing and plating.

  FIG. 2 is a plan view showing a detailed configuration of the end face machining apparatus 5 according to the embodiment of the present invention incorporated in the pickling cold rolling continuous line, and FIG. 3 is an end face machining apparatus 5 according to the embodiment of the present invention. It is a side view which shows the detailed structure. As shown in FIGS. 2 and 3, the end surface machining apparatus 5 includes, for example, two rotatable circular cutting tools 15 a, 15 b and 16 a, 16 b on one side, and the cutting edge thereof is cut by a cutting device such as a side trimmer 4. The cut end face is pressed and held so as to cut into the cut end face of the cut steel sheet 1a, and the cut end face is cut.

  The end surface machining device 5 is installed in the rear stage of the side trimmer 4 and restrains the side rollers 11a and 11b, the cylinders 12a and 12b that press the side rollers 11a and 11b against the end surface of the steel plate, and the upper and lower surfaces of the steel plate 1a. Pinch rolls 13 and 14, circular cutting tools 15a, 15b, 16a and 16b (15a to 16b) for cutting the end face of the steel plate 1a, and advancing and retracting driving devices 17a and 17b for driving these circular cutting tools back and forth in the plate width direction; The forward / backward drive devices 17a and 17b are installed, and are composed of tool bases 18a and 18b movable along the linear guide 19 in the plate direction in conjunction with the side rollers 11a and 11b.

  The end surface machining device 5 controls the advance / retreat drive devices 17a and 17b while the side rollers 11a and 11b are in contact with the end surface of the steel plate 1a, thereby adjusting the cutting amount of the circular cutting tools 15a to 16b into the end surfaces of the steel plate. Therefore, the side rollers 11a and 11b act as positioning means together with the advance / retreat drive devices 17a and 17b when positioning the circular cutting tool with respect to the steel plate 1a. In this way, the cutting edges of the circular cutting tools 15a to 16b are pressed and held so as to cut into the end faces of the steel sheet, the steel sheet 1a is moved, and both end faces of the steel sheet 1a are cut while rotating the circular cutting tools 15a to 16b. The amount of cutting is such that the end face can be smoothed and cracks can be removed from the end face. For example, in the case of a steel sheet with a low carbon diameter, it is about 0.3 mm.

  The end face processing of the steel sheet 1a using the end face machining apparatus 5 is performed, for example, by using small diameter circular cutting tools 15a and 16a having a diameter of about 10 mm on one end face side of the both end faces of the steel sheet 1a and the same small diameter on the other end face side. The circular cutting tools 15b and 16b are arranged symmetrically in the plate thickness direction of the steel plate 1a, and the respective cutting edges are in contact with the upper and lower edges of the end surface of the steel plate 1a. Thereby, the inside of the fracture surface of the side trimmer cut surface of the steel plate 1a can be smoothed without generating burrs or burr at the edge portion, and the micro cracks or the like generated in the fracture surface can be removed.

  In addition, the plate | board thickness of the steel plate 1a is about 4 mm, and when raising the diameter of the circular cutting tools 15a-15b and 16a-16b in order to raise processing efficiency (for example, diameter 100mm), upper and lower circular cutting tools are shown in FIG. Thus, it becomes difficult to arrange them symmetrically. Therefore, when installing a circular cutting tool with a large diameter, as shown in FIG.

3 and 4 show an example in which two circular cutting tools are installed on one end face, but one circular cutting tool having a large diameter (for example, about 100 mm in diameter) may be arranged on one end face of the steel plate.
FIG. 5 is an explanatory view showing the positional relationship between the cutting tool and the steel plate when one circular cutting tool is installed on one end face of the steel plate. In this case, as shown in the drawing, the inclination of the circular cutting tool with respect to the conveying direction of the steel sheet is about 45 degrees. Further, the rake angle of the cutting edge of the circular cutting tool is preferably in the range of 0 to 15 degrees.
In addition, about the inclination | tilt angle with respect to the steel plate of a circular bite, multiple arrangement | positioning (multistage formation), etc. to a steel plate longitudinal direction, design change is possible suitably as needed.

  By the way, each circular tool may be rotated by using an electric motor or the like, but if it is driven and rotated by receiving the moving force (conveying force) of the steel plate and the cutting reaction force of the end surface, the end surface machining device This is preferable because the equipment can be simplified. FIG. 6 is a perspective view illustrating that one circular cutting tool installed on one end face rotates following a moving force and a cutting reaction force of a steel plate. In the case of FIG. 6, the circular cutting tool is driven to rotate counterclockwise in response to the moving force and cutting reaction force of the steel plate. By cutting the end face while rotating the circular cutting tool in this way, the contact portion between the circular cutting tool and the end surface of the steel sheet is changed sequentially, and the heating and wear of the cutting tool can be prevented.

FIG. 7 is a side view seen from the downstream side in the steel plate conveyance direction showing the situation where the circular cutting tool cuts the end face when two circular cutting tools are installed on one end face of the steel plate 1a, and FIG. 8 shows the steel plate of FIG. It is a schematic diagram explaining the contact aspect of an end surface and a circular cutting tool. In the case of this example, the lower end portion of the 4 mm thick steel plate end surface is cut with a circular cutting tool arranged on the lower side, and the upper end portion of the steel plate end surface is cut with a circular cutting tool arranged on the upper side. The contact angle θ of the outer periphery of the circular cutting tool with respect to the end of the steel plate is an acute angle of 90 degrees or less. And the steel plate end surface is cut into the circular arc shape in a figure. In addition, the dotted line in a figure represents the outline of the steel plate edge part before cutting.
As shown in FIGS. 7 and 8, by arranging two or more circular cutting tools on one side of the end face of the steel sheet in the thickness direction, machining that does not generate burrs at the edge of the end face of the steel sheet can be reliably realized.

The figure which shows an example of the pickling cold rolling continuous line of the steel plate provided with the end surface machining apparatus which concerns on this invention. The top view which shows the detailed structure of the end surface machining apparatus which concerns on embodiment of this invention. The side view which shows the detailed structure of the end surface machining apparatus which concerns on embodiment of this invention. The side view which shows the detailed structure of the end surface machining apparatus which concerns on embodiment of this invention at the time of enlarging the diameter of a circular cutting tool. Explanatory drawing which showed the positional relationship of a cutting tool and a steel plate at the time of installing one circular cutting tool in one side end surface. The perspective view explaining that the byte | cutting-tool in the case of installing one circular bite on one side end surface receives the steel plate cutting reaction force, and rotates following. The side view seen from the downstream of the steel plate conveyance direction which shows the condition where the cutting tool cuts the end face when two circular cutting tools are installed on one end face. The schematic diagram explaining the contact aspect of the steel plate end surface of FIG. 7, and a circular cutting tool.

Explanation of symbols

1a Steel sheet (hot rolled)
1b Steel plate (cold rolled)
2 Feeding end 3 Pickling tank 4 Side trimmer 5 End face machining device 6 Cold rolling group 7 Winding end 11a, 11b Side roller 12a, 12b Pressing cylinder 13, 14 Pinch roller 15a, 15b, 16a, 16b Circular cutting tool 17a, 17b Advance / retreat drive device 18a, 18b Tool stand 19 Linear guide

Claims (4)

A steel plate end surface machining method for cutting a cut end surface cut by a cutting device that cuts both ends of a steel plate to a specified width,
In the method of cutting both end faces of the steel sheet while pressing and holding a rotatable circular cutting tool so that the cutting edge cuts into the end face, moving the steel sheet, and rotating the circular cutting tool ,
A method for machining an end face of a steel sheet , wherein each end face is cut by using two or more circular cutting tools arranged at different angles in the thickness direction of each end face of the steel sheet. The end face machining method for a steel sheet according to claim 1, wherein the circular cutting tool is driven to rotate by a moving force of the steel sheet and a cutting reaction force of the end face. A steel plate end surface machining device for cutting a cut end surface cut by a cutting device that cuts both ends of a steel plate to a specified width,
A rotatable circular cutting tool movably arranged so that a cutting edge can be cut into the end face, and positioning means for positioning the circular cutting tool with respect to the steel plate,
Two or more circular cutting tools are arranged at different angles in the plate thickness direction of each end surface of the steel plate, and the steel plate end surface machining apparatus. 4. The steel plate end face machining apparatus according to claim 3, wherein the circular cutting tool is driven and rotated by a moving force of the steel plate and a cutting reaction force of the end face plate.

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