JPH01264714A - Side trimming method and its device - Google Patents

Abstract

PURPOSE:To perform positive trimming operation to improve the quality of cutting face by performing pressing of a strip both on the product side and trim-scrap side at the entrance or exit side in the direction of passing the strip, and providing a pressing jig, which can be displaced toward the entrance or exit side in the direction of passing the strip and a pressing force of which is adjustable, to a strip-presser device on the trim scrap side. CONSTITUTION:Since an end part of a strip 3 is pressed both on the product W side and trim t side so as not to move when a continuous rotational cutting is performed, the strip is trimmed under a stable supporting condition, and a positive trimming operation is performed. A pressing ring 4 is shifted to the exit side in the direction of passing the strip or from a strip-holding position A-A to the entrance side by advancing or retacting bolts of a shifting device 11 in a range of a gap m between a housing 5 in bearing and a rotary shaft 6. By adjusting the amount of advance and retract of the bolts or the amount of shim between the bolts and the pressing ring-housing 7, a fine adjusting of the offset position is possible, and vertical motion of the housing is adapted to be possible by a vertical motion adjusting device 12, and as a result, a pressing force is adjusted by adjustment of the vertical motion by means of the adjusting device.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a side trimming method and apparatus for rotary cutting the end of a thin steel strip (hereinafter referred to as a strip) using a pair of upper and lower round blades in a side trimmer or the like. It is related to.

[Conventional technology]

Conventionally, in the side trimming method, a round blade on the side opposite to the trim scrap side (product side) is connected to - rollers, a ring-shaped elastic body, or a circular arc centered on the rotation axis of the round blade. The strip is pressed by a plurality of rollers (Japanese Utility Model Publication No. 60-8884, Japanese Utility Model Application Publication No. 61-925)
(Refer to Publication No. 14 and Japanese Utility Model Publication No. 54-17177), or the strip is pressed by a tubeless type hollow rubber ring not only against the round blade on the product side but also against the round blade on the trim waste side ( Jitsukai 1986-1988
(See Publication No. 521).

[Problem to be solved by the invention]

If the above-mentioned temporary pressing is not performed, for example, if the material has a very low yield stress, the quality of the cut surface will be poor or cutting will not be possible even under the same cutting conditions. This is not only due to the rigidity of the trimmer itself, but also due to the stiffness of the strip itself.
This is due to the lack of rigidity of J properties and trim scraps. Therefore, in the conventional side trimming method, temporary pressing is performed as described above, but in order to press only the product side of the strip, depending on the material and thickness of the strip,
Again, there are disadvantages in that the quality of the cut surface is poor or cutting becomes impossible.

In addition, in the conventional side trimming method described above, in which the product side and the end side of the strip are simultaneously pressed, a fluid is sealed in a rubber ring and the rubber ring presses the trim scrap side against the round blade, so the restraining force of the trim scrap is reduced. It is difficult to freely change the binding force of the trim scraps depending on the material and thickness of the strip. Furthermore, since the temporary holding position is fixed, there is a problem in that the temporary holding position cannot be adjusted depending on the material and thickness of the strip.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and it is possible to perform trimming work by adjusting the temporary holding position on the trim scrap side according to the material and thickness of the strip, and by changing the restraining force. The purpose is to be able to perform this reliably and to improve the quality of the cut surface.

[Means for Solving the Problems] The side trimming method according to the first aspect of the present invention involves passing a strip between an upper blade and a lower blade and pressing the strip against the lower blade (or upper blade) on the product side. In the side trimming method in which the end of the strip is continuously cut by rotation, the strip is pressed against the upper blade (or lower blade) on the trim scrap side on the exit side or input side in the threading direction from the rotation center axis. is characterized by holding.

The side trimming method according to the second invention includes the first
In the side trimming method according to the present invention, the cutting edge angle of the upper blade (or lower blade) on the trim scrap side is set at 90° to 135°.
The cutting edge angle of the lower blade (or upper blade) on the product side is a right angle.

The side trimming device according to the third aspect of the present invention is a product that is provided with a disc-shaped upper blade and a lower blade that can continuously rotate and cut the end of the strip, and that presses the strip against the lower blade (or upper blade) on the product side. In a side trimming device equipped with a side plate holding device, a blade that can be shifted to the exit or entry side of the sheet threading direction and can be moved up and down below (or above) the upper blade (or lower blade) on the trim scrap side. The present invention is characterized in that a rotatable pressing jig is provided, and the pressing force for pressing the strip against the upper blade (or lower blade) via the pressing jig can be adjusted by a vertical movement device.

〔Example〕

An embodiment of the method of the present invention will be described below with reference to FIGS. 1 to 4.

In the method of the present invention, a strip 3 is passed between the lower blade 1 and the upper blade 2, which are disk-shaped knives (round blades), and the end of the strip 3 is pressed against the lower blade 1 on the product W side. In the side trimming method of continuously rotating and cutting, a pressing ring 4 is arranged opposite to the upper blade 2 on the side where the trim scraps are removed, and the pressing ring 4 is placed on the entry side in the threading direction from the round blade rotation center position 0-0. The strip 3 is offset and the pressing ring 4 supports the strip 3 from the biting position A-A to the cutting completion position C-C, and the adjusted pressing against the upper blade 2 is performed by force.

The cutting edge angles of the lower blade 1 and the upper blade 2 may both be at right angles as shown in FIG. From the relationship with the generated shearing force (Fig. 4), the cutting edge angle θ of the upper blade 2 is 90° ~
It is preferable to set it as an obtuse angle of 120@. This is because, as was found from the analysis results using the large deformation elasto-plastic finite element method, shearing force is more likely to be generated at the cutting edge position of the lower blade 1 when the upper blade 2 is an obtuse-angled knife than a right-angled knife. The fact that shear force is likely to occur means that the shear surface ratio is small and it is thought that it will easily lead to breakage, and if the shear surface ratio can be set to an appropriate value, the occurrence of saws at the ends of the strip 3 can be suppressed. In addition, it is possible to prolong the life of the knife and reduce the number of times the knife needs to be replaced.

In this embodiment, an example was explained in which the strip 3 is pressed against the side circular blade (upper blade 2) on the entry side in the threading direction to hold the trim waste on the side. Even if you hold the trim scraps on the side, the trim scraps will be removed by the side round blade (upper blade 2).
The same effect can be achieved by wrapping the strip around the trim scrap in order to provide stable support during side shearing.

In addition, we have explained an example in which the round blade on the trim scrap side is the upper blade 2 and the round blade on the product W side is the lower blade 1, but conversely, the round blade on the trim scrap side is the lower blade 1, and the round blade on the product W side is the lower blade 1. It goes without saying that it is good to use the upper blade 2 as well.

Furthermore, although an example has been described in which the pressing jig is the pressing ring 4, it goes without saying that a pressing roller or the like may be used.

[Effect]

When the end of the strip 3 is continuously cut by rotation, the product W side and the trim side are held together so as not to move during shearing, so that side trimming is performed in a stable supported state.

Therefore, the side trimming work can be performed reliably regardless of the material and thickness of the strip 3.

Next, embodiments of the apparatus of the present invention for carrying out the above method of the present invention will be described with reference to FIGS. 5 to 12.

5 and 6 show the first embodiment.
1 is a housing within the bearing, which is loosely fitted onto the rotating shaft 6 on which the lower blade 1 on the product W side is attached with a gap m therebetween, and is fixedly supported on the pressing ring housing 7. The press ring housing 7 is placed on a press base 8 so as to be movable in the sheet passing direction, and the press ring housing 7 is a shift device fixed to the trimmer base 10 via a bearing or liner 9 that allows the press base 8 to move up and down. 11 (bolt press type in the embodiment) so that the shift can be adjusted in the sheet passing direction. The pressing table 8 is supported on a trimmer base 10 via a vertical movement device 12 (a cylinder in the embodiment) so as to be vertically adjustable. Further, reference numeral 13 denotes a rotary cartridge having a pressing ring 4 attached to its outer circumference, and a bearing 14 mounted in the bearing inner housing 5.
The pressing ring 4 is rotatably mounted through the strip 3, so that the pressing ring 4 is disposed opposite to the side upper blade 2 via the strip 3. Therefore, the pressing ring 4 is moved to the exit side in the sheet passing direction by moving the bolt of the shift device 11 back and forth within the range of the gap m between the bearing inner housing 5 and the rotating shaft 6.
Alternatively, the offset position can be finely adjusted by shifting from the strip biting position A-A to the entry side and adjusting the amount of advance and retreat of the bolt or the amount of shim between the bolt and the pressing ring housing 7. The device 12 allows for vertical adjustment.

The pressing force is adjusted by adjusting its vertical movement. Depending on trimming conditions such as the material of the strip and the plate thickness, if temporary holding is not necessary, the bearing inner housing 5 is lowered and moved in the direction of the rotating shaft 6 and retracted.

Figures 7 and 8 show the second embodiment.
Reference numeral 5 denotes a pressing arm, whose intermediate portion is rotatably supported by the upper end of the bracket 16. The bracket 16 is attached to the trimmer base 10 by fastening a mounting base 17 with bolts, and by making the bolt through hole 18 provided in the mounting base 17 into a long hole, the bracket 16 can be shifted in the threading direction. The pressing roller 19 is rotatably attached to one end of the pressing arm 15, and supported so as to be vertically movable by a vertical movement device 20 provided between the other end of the pressing arm 15 and the trimmer base 10. , therefore, the pressing roller 1
9, the mounting of the bracket 16 can be shifted to the exit side in the strip passing direction or from the strip biting position A-A to the entry side by adjusting the position, and after the shift adjustment, the vertical movement device 20 can be used to adjust the mounting position. Vertical movement can be adjusted by rotating the pressing arm 15. The pressing force is adjusted by adjusting its vertical movement. When the temporary press is no longer necessary, the pressing roller 19 is lowered and retracted. In this example,
Although an example has been described in which the offset position of the pressing roller 19 is adjusted by changing the position of the bracket 16, it goes without saying that changing the fulcrum position of the pressing arm 15 may also be used.

Figures 9 and 10 show the third embodiment, in which reference numeral 21 denotes a pair of pressing arms, the lower end of which is a bracket 2.
2 and pin 23 to be rotatably connected to the trimmer frame 10, the intermediate portions are arranged opposite to each other with the rotating shaft 6 in between, and the upper end portions are disposed close to each other and above the rotating shaft 6, and are provided respectively. They are supported at opposing positions by an elevation device 24 (cylinder in the embodiment).

A receiving roller 25 is rotatably attached to the upper end of each of the pressing arms 21. The pressing roller 26 is rotatably supported above between the receiving rollers 25 . Therefore, the pressing roller 26 is moved to the exit side in the strip passing direction or to the strip biting position A-A by the cooperation of both the elevating devices 24.
The shift can be adjusted to the input side, and the vertical movement can be adjusted, and the pressing force can be adjusted by adjusting the vertical movement. When the temporary press is no longer necessary, the pressing roller 26 is removed and the receiving roller 25 is moved back.

11 and 12 show the fourth embodiment, and 27 in the figure is a shift frame, which is supported by the trimmer frame 10 so as to be shiftable in the sheet passing direction via cam mechanisms 28 and 29, which will be described later. shift device 30 (cylinder in the embodiment)
is connected to. A plurality of receiving rollers 31, 31' are rotatably attached to the upper part of the shift frame 27,
An upper cam 28 is attached to the lower part. Upper cam 28
A lower cam 29 is supported on the trimmer frame IO so as to be movable in the sheet passing direction, and is connected to a vertical movement device 32 (a cylinder in the embodiment). The upper cam 28 and the lower cam 29 have inclined surfaces 33 and 34 that are inclined along the sheet passing direction.
is formed, and the upper cam 2 is formed at the inclined surface 33,34.
8 and the lower cam 29 are in movable contact with each other. Reference numeral 35 denotes a pressing ring housing having a pressing ring 4 attached to its outer circumference, and is rotatably supported on the shift frame 27 via the receiving roller 31. Therefore, the pressing ring 4 can be shifted to the exit side in the strip passing direction by the shift device 30, or from the strip biting position A-A to the entry side, and the upper cam is stopped after the shift adjustment. The vertical movement can be adjusted by moving the lower cam 29 relative to 28 using a vertical movement device 32. The pressing force is adjusted by adjusting its vertical movement.

When the temporary press is no longer necessary, the press ring housing 35 is lowered and retracted.

As can be seen from the effects of the above embodiments, the apparatus of the present invention is effective when directly used to carry out the method of the present invention.

〔Effect of the invention〕

As described above, the method of the present invention temporarily holds the product side and also temporarily holds the trim scrap side on the entry side or exit side of the strip threading direction, so the trim scraps being trimmed are restrained and the rigidity of the strip is increased. It is possible to reliably increase the pressure, and also to freely change the temporary pressing position and set the optimal pressing force according to the material and thickness of the strip. Therefore, the trimming work can be performed reliably, and the shape of the cut surface can be improved, and the occurrence of saw marks after cold rolling can be suppressed by setting the shear surface ratio to an appropriate value, thereby improving the quality of the cut surface. It can also be improved.

In addition, the device of the present invention is provided with a product side plate holding device, and a trim scrap side temporary holding device in which a pressing jig can be moved to the entry side or the exit side in the sheet passing direction, and the pressing force can be adjusted. Since it is provided, it is effective when directly used to carry out the method of the present invention, and because of its simple configuration, it can be easily applied to existing equipment, and the equipment cost is low.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing an embodiment of the method of the present invention, Fig. 2 is an enlarged sectional view taken at the center of rotation of the round blade 0-0 in Fig. 1, and Fig. 3 is an enlarged cross-sectional view of the round blade in Fig. 1 with the cutting edge angle changed. A sectional view corresponding to Fig. 1, Fig. 4 is a relationship diagram between shear force and knife angle θ, Figs. 5 and 6.
The figure is a cross-sectional view taken along the line A-A and a front view showing the first embodiment of the device of the present invention, and FIGS. 7 and 8 are cross-sectional views taken along the line B-B and the front view showing the second embodiment of the device of the present invention. Figure, Figure 9. FIG. 10 is a sectional view taken along the line C-C and a front view showing the third embodiment of the device of the present invention, and FIGS. 11 and 12 are the fourth embodiment of the device of the present invention.
FIG. 3 is a sectional view taken along D-DwA showing an example. It is a front view of the same. l...Lower blade, 2...Upper blade, 3...Strip, 4
...Press ring, 5...Bearing inner housing, 6...
・Rotating shaft, 7... Pressing ring housing, 11...
Shift device, 12... Vertical movement device, 13... Rotating cartridge, 14... Bearing, 15... Pressing arm,
16...Bracket, 18...Long hole, 1'l...
Pressing roller, 20... Vertical movement device, 21... Pressing arm, 24... Elevation device, 25... Receiving roller, 26
... Pressing roller, 27 ... Shift frame, 28.
... Upper cam, 29... Lower cam, 30... Shift device, 31.31'... Reception roller, 32... Vertical movement device, 33.34... Inclined surface, 35... Press ring housing. Fig. 1 Fig. 4 Knife angle Fig. 2 Fig. 3 Fig. 5 Fig. 7 Fig. 6 r', A No. 8 m! B

Claims (3)

[Claims] (1) Pass the plate between the upper and lower blades, and the lower blade on the product side (
In the side trimming method, in which the end of the strip is continuously cut by rotation while pressing the strip against the trim scrap side (or upper blade), the upper blade (or lower blade) on the trim scrap side is A side trimming method characterized by pressing a strip on the exit or entry side. (2) Adjust the cutting edge angle of the upper blade (or lower blade) on the trim scrap side to 90
2. The side trimming method according to claim 1, wherein the angle is an obtuse angle of 135° to 135°, and the cutting edge angle of the lower blade (or upper blade) on the product side is a right angle. (3) Side trimming device equipped with a disc-shaped upper and lower blade that can continuously rotate and cut the end of the strip, and a product side plate holding device that presses the strip against the lower blade (or upper blade) on the product side. , a rotatable pressing jig is provided below (or above) the upper blade (or lower blade) on the trim scrap side, which can be shifted to the exit side or the input side in the sheet passing direction, and can be moved up and down, A side trimming device characterized in that a pressing force for pressing the strip against the upper blade (or lower blade) via the pressing jig can be adjusted by a vertical movement device.