JPS61241009A - Strip sheet edge cutting device - Google Patents

Abstract

PURPOSE:To prolong the life of a tool, suppress the birth of burrs, and improve machining accuracy by tilting the rotary shaft of a cuter to the passing direction of a strip sheet untill the cutting edge and the passing direction of the strip sheet make approximately right angles. CONSTITUTION:A cutter 35 is used of which the cutting edge 40 is twisted by a specified angle phi in relation to the axis 39 of a rotary shaft such as herical tool plain milling cuter or the like, for example. The axis 39 of the cutter 35 is tilted by angle theta1 to the passing direction of a strip sheet 12 so that an angle theta2 made by the cutting edge 40 and the strip sheet 12 may become approximately 90 deg. (55 deg.<=theta2<=125 deg.). This constitution serves for the suppression of the birth of burrs. In addition, the life of the cutter 35 is prolonged by setting the inclination theta1 at 70 deg. or less.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a strip edge cutting device for cutting the side edge of an IJ tube in a rolling line, etc., and aims to increase tool life and improve machined surface accuracy. It was planned.

<Prior Art> Strip processing equipment such as a steel plate rolling line is equipped with a trimming process in which both ends of the strip are cut into rounds to keep the width of the strip constant. Conventionally, the side trimmer for cutting both side ends of the strip is a pair of circle cutters 11a, as shown in FIG.

The strip 12 is sandwiched between 11b and sheared. However, in the case where the circle cutters 11a and llb are used, the circle cutters lla and llb are used in the sheared part.
Since the cutting edge of the llb and the strip 12 escape from each other, a cutting allowance that is at least equal to the thickness of the strip 12 must be taken, which causes a decrease in yield. In addition, since the cutting is performed using a perforation action, the metal flow at the cut portion of the strip 12 is distorted, causing rolling cracks in the subsequent process, and furthermore, the cut scrap continues in a thread-like manner, resulting in subsequent scrap. The disadvantage was that it was troublesome to process.

Therefore, a strip edge cutting device has been proposed in which a rotating milling cutter is applied to the side edge of a conveyed strip to scrape the side edge. According to this, the cutting allowance can be set extremely small, the metal flow of the strip 12 is not distorted, and chips are generated in a divided form that is easy to dispose of.

<Problems to be Solved by the Invention> However, the strip threading speed is as high as 100 meters to 400 meters per minute, and the thickness of the strip is as thin as 3 mm on average. Conventional strip edge cutting devices have a problem in that the υ cutter with burrs on the cutting surface wears out in a short period of time.

<Means for Solving the Problems> The present invention solves these conventional problems, and aims to provide a strip edge cutting device designed to improve machined surface accuracy and extend tool life. The purpose is

To achieve this object, the present invention has a configuration of an IJ knob cutting device that has a cutting edge twisted at a certain angle with respect to the rotation axis on the outer circumferential surface, and the side edge of the IJ knob. a cutter for cutting the cutter; and a cutter head for supporting the cutter with its rotation axis tilted so that the angle between the cutting edge of the cutter and the strip passing direction is approximately 90 degrees, and for rotating the cutter. and a support roll that clamps the vicinity of the side edge of the strip from both sides and guides its position.

Function: Since the rotation axis of the cutter is inclined with respect to the strip threading direction, the side edge of the strip is cut using the entire width of the cutting edge of the cutter, which equalizes the cutting load. . In addition, the cutting edge of the cutter is approximately perpendicular to the strip threading direction, so there is no crease on the cut surface, and even if there is a crease, it is minimal, and the rigidity of the strip is Since the cutting is done in the direction of threading where the strip is highest, there is almost no deflection of the strip.

Practical example An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a front view of a strip edge cutting device according to an embodiment of the present invention, and FIG. 2 is a side view thereof.

In FIGS. 1 and 2, the support frame 22 can approach and leave the strip passageway on the left and right sides of the strip passageway on the pace 21 (slidable in the left and right directions in FIG. 1). A screw shaft 23 is rotatably supported in the pace 21 below each support frame 22, and a feed nut 24 attached to the lower surface of each support frame 22
are screwed into their screw shafts 23, respectively. Both screw shafts 23 have spirals in different directions, and are connected by a connecting shaft 25, and one end of one screw shaft 23 is connected to a drive motor 27 via a speed reducer 26. Therefore, when the drive motor 27t is operated to rotate the screw shaft 23, the support frames 22 move toward and away from each other, and the distance between them is adjusted. Incidentally, FIG. 1 shows the state in which the two are closest to each other.

A bracket 28 is provided upright on the support frame 22, and a support roll 29 is supported there. The support rolls 29 are positioned facing the strip running path, and guide the position of the strip by pinching the vicinity of the side edges of the strip from both upper and lower surfaces. A slide table 30 is further supported on the support frame 22 so as to be able to approach and leave the strip passageway, while a piston shaft of a cylinder 31 attached to the support frame 22 or serving as a tract drive device slides. The sliding table 30 is pivotally attached to the table 30, and is driven in the approaching and separating directions by the operation of the retract cylinder 31.

Furthermore, a cutter head 34 is mounted on the slide table 30, and includes a spindle drive motor 32, and a drive force transmission device 33 that pivotally supports the spindle and has a built-in deceleration mechanism therefor.

Furthermore, a cutter 35 for cutting the side edge of the strip is detachably attached to the spindle of the driving force transmission device 33 adjacent to the support roll 29. Here, the cutter 35 has a cutting edge twisted at a certain angle with respect to its rotation axis on its outer peripheral surface, and the spindle of the cutter head that rotationally drives one cutter 35 is aligned with the cutting edge of the cutter 35 and the strip passing direction. It is inclined at a required angle so that the angle is approximately 90 degrees.

In such a configuration, when the slide table 30 is advanced (closed to the strip passageway side), the distance between the support frames 22 is adjusted by the drive motor 27 according to the width of the strip, and As the strip is conveyed, the support roll 29 guides the strip, and the cutter 35 cuts both side edges of the strip. On the other hand, if an excessive load is applied to the cutter 35, the slide tract cylinder 31 is operated to move the slide table 30 backward to release the cutter 35 from contact with the strip, thereby preventing damage to the strip.

In the present invention, as shown in FIG. 4 showing the principle of cutting, a cutter 35 with a cutting edge 40 twisted by a certain angle φ with respect to the axis 39 of a rotating shaft, such as a twisted-blade flat-7 cutter, is used. The axis IfM39f of the cutter 35 is tilted by θ□ with respect to the threading direction of the strip 12, and the cutting edge 4 is
0 and the strip 12 is set to approximately 90 degrees (55 degrees≦02≦125 degrees). That is,
If θ2 is made smaller or larger than this,
As shown in FIG. 5, which shows the cross-sectional shape of the cut portion of the strip 12, a break 41 is generated at the end of the cut surface of the strip 12. On the other hand, as shown in FIG. 6, which shows the relationship between the length L of the blade 41 and 02, 55 degrees≦02690
L can be considered to be approximately zero in the range of 9.
It has been confirmed that the same holds true in the range of 0 degrees≦θ26125 degrees. This data is based on a strip of 2.6 mm thick transported at a speed of 400 meters per minute, with the axis 39 of the cutter 35 tilted by 45 degrees (θ,), the depth of cut 3 mm, and the cutting speed. This is the value when the speed is set to 200 meters per minute.

On the other hand, Fig. 7 shows the relationship between the tool life ratio and θ, where θ1 is 1 when θ1 is set to 90 degrees.
This data is obtained when the cutting speed of the cutter 35 is set at 200 meters per minute and the depth of cut is set at 5 mm. As is clear from this graph, by setting θ to 670 degrees, the life of the cutter 35 can be extended. In the present invention, as is clear from FIG. 4, the cutting edge 40 has a cutting speed in the direction along it (vertical direction in FIG. 4), so the actual rake angle of the cutting edge 40 is the tip of the cutter 35. The rake angle is larger than the original rake angle defined by the shape, and as a result, the occurrence of burrs 41 is reduced and the cutting force is also reduced, which is more advantageous in terms of tool performance. In addition, if θ is set to 5 degrees or less, the cutting edge 40 must be set extremely long, making it difficult to put it into practical use.
The lower limit of θ is preferably about 5 degrees. Furthermore, if the cutter 35 is reciprocated in a direction parallel to the axis 39 during machining or when not machining, the width of the cutting edge 40 can be used more effectively, which is even more advantageous in terms of tool life. .

In the above-described embodiment, the cutter 35 is cylindrical; however, for example, in the case where a pipe is manufactured by curving an IJ tube, butting both end surfaces of the tubes against each other, and joining them by welding, It is preferable that the end surface of the strip serving as the joining surface is inclined, and in such a case, a cutter having a conical outer periphery is suitably used. Further, in the above-described embodiment, the cutter head 34 is provided on both sides of the strip passageway, but depending on the case, the cutter head 34 may be provided only on one side, or the support frame 22 or the sliding base The sliding movement mechanism such as 30 can also be changed or omitted as appropriate.

<Effects of the Invention> As described above in detail with reference to one embodiment, according to the present invention, since the rotation axis of the cutter is inclined with respect to the strip passing direction, the entire width of the cutting edge of the cutter can be This means that the side edges of the strip are cut, making it possible to equalize the cutting load and extend the tool life. In addition, since the cutting edge is approximately at an angle with respect to the strip threading direction, no beams occur on the cut surface, and even if any beams do occur, it is minimal, and the rigidity of the strip is the highest. Since the cutting is carried out in a high threading direction, there is almost no bending of the strip, and it is possible to improve the precision of the machined surface, and there is no risk of tool breakage due to chatter.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention, Figure 1 is a front view of a strip edge cutting device, Figure 2 is a side view thereof, and Figure 3 illustrates the principle of a conventional side trimmer. Fig. 4 is a conceptual diagram of the work showing the principle of strip edge cutting according to the present invention, Fig. 5 is a sectional view of the IJ hub side end, and Fig. 6 is a diagram of the relationship between the strip and the cutter cutting edge. FIG. 7 is a graph showing the relationship between the angle formed by the cutter and the length of the burr, and FIG. 7 is a graph showing the relationship between the angle formed between the rotation axis of the cutter and the strip and the tool life ratio. In the drawing, 12 is a strip, 29 is a support roll, 34 is a cutter head, and 35 is a cutter. Figure 6 Figure 7

Claims (1)

[Claims] A cutter that has a cutting edge twisted at a certain angle with respect to the rotation axis on the outer peripheral surface and cuts the side edge of the strip with the cutting edge, and the angle between the cutting edge of the cutter and the threading direction of the strip is approximately A cutter head that supports the cutter with its rotational axis tilted at 90 degrees and rotationally drives the cutter, and a support roll that pinches the vicinity of the side edge of the strip from both sides to guide its position. A strip edge cutting device characterized by: