JPH07116909A - Belt plate cutting device - Google Patents

Abstract

PURPOSE:To reduce facility cost and maintenance cost for blade polishing by cutting a continuously running belt plate at almost a right angle to the direction of its running in a manufacturing process of a steel belt. CONSTITUTION:It is a drum shear in which flat helical blades 3, 4 are opposingly mounted on respective peripheral faces of two drums 1, 2 which rotate opposingly. The flat helical blades 3, 4 are tilted and mounted for rotary axes 5, 6 of the drums 1, 2, and a blade tip 7 is elliptical so that the distance from the rotary axes 5, 6 of the drums 1, 2 to the blade tip 7 of the flat helical blades 3, 4 becomes equal in the axial direction. The flat helical blades 3, 4 are mounted vertically to a drum face at a center in the direction of length of the drum 1, 2, and the blade tips 7 of both flat helical blades 3, 4 are mounted in such an engagement with O or minus lap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting continuously running strips such as steel strips substantially at right angles to the running direction.

[0002]

2. Description of the Related Art A rotary drum shear is used as a device for cutting continuously running strips in a production line for strips such as steel strips.
As shown in FIG. 5, Japanese Unexamined Patent Publication No. 12 discloses a drum shear in which twisted helical blades 21 and 22 are attached to drums 1 and 2 which face each other.

This drum shear has a double-twisted helical blade 2
Since the engagement positions of 1 and 22 move with the movement of the strip, the strip can be cut substantially at right angles to the running direction, the quality of the cut is excellent, and the driving load can be reduced. However, since the twisted helical blades 21 and 22 have a twisted shape, a great deal of time and cost are required at the time of manufacturing and re-polishing the blade.

[0004]

The steps of cutting a strip that is running continuously include cutting out a product of a specified length and discarding the product off-gauge, as well as cropping and off-gauge of an intermediate material during manufacturing. There is also a truncation of. In the case of the intermediate material, the quality of the cut surface does not matter and it is required to cut at a low cost.

The present invention is a device for cutting a strip that is continuously running, mainly about an intermediate material, in a process for producing a strip such as a steel strip, at a substantially right angle to the running direction. An object of the present invention is to provide an apparatus with reduced maintenance costs such as polishing.

[0006]

DISCLOSURE OF THE INVENTION The present invention for achieving the above object is a drum shear in which flat plate helical blades are attached to the peripheral surfaces of two drums that are opposed to each other so as to face each other. Is mounted so as to be inclined with respect to the rotation axis of the drum, and the cutting edge has an elliptical shape so that the distance from the rotation axis of the drum to the cutting edge of the flat plate helical blade is equal in the axial direction. This is a band plate cutting device in which a helical blade is mounted perpendicularly to the drum surface, and the laps of the blade edges of both flat plate helical blades are engaged with zero or minus as the drum is opposed to each other. Further, it is a strip plate cutting device including such a drum shear and a leveler-type dividing roll installed on the rear surface side of the drum shear.

[0007]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a drum shear of the present invention. Drum 1,
Reference numeral 2 is connected to gears 8 and 9, respectively, and is driven by a drive source (not shown) to rotate in opposite directions about the rotary shafts 5 and 6 in the directions of the arrows. Flat drum blades 3 and 4 are attached to the drums 1 and 2, respectively. Since both blades 3 and 4 are attached symmetrically, the flat plate helical blade 3 will be described below.

The flat plate helical blade 3 is a rotary shaft 5 of the drum 1.
With respect to the rotary shaft 5 so that the distance from the rotary shaft 5 to the cutting edge 7 is equal at any position of the rotary shaft 5.
The cutting edge 7 has an elliptical shape. As shown in FIG. 3, such a flat plate helical blade 3 has a cutting surface 1 inclined by an angle θ with respect to an axial plane 11 of a cylindrical body 10 having the same diameter as the drum 1.
It is obtained by cutting the cylindrical body 10 at 2. Then, the flat plate helical blade 3 is attached to the drum 1 by means such as processing a groove to fit the drum 1, and the like.
As shown in (b), the flat plate helical blade 3 is attached so as to be perpendicular to the drum surface.

Both flat plate helical blades 3 and 4 are drums 1 and 2.
1, the two cutting edges 7 are sequentially engaged from the left side of FIG. 1, and the rotary shafts 5, 6 are engaged as shown in FIG. 2A in the BB cross section and FIG. 2B in the AA cross section. The lap of both cutting edges should be 0 or negative at any position of the.

When the strip is cut by the cutting device of the present invention, the drums 1 and 2 are rotated oppositely at the same peripheral speed as the traveling speed of the strip. At this time, in the central part of the drums 1 and 2,
As shown in FIG. 2B, the flat plate helical blades 3 and 4 are parallel to each other, but at the position deviated from the central portion, they are not parallel to each other as shown in FIG. 2A, for example. Therefore, the flat plate helical blades 3 and 4 cannot be overlapped with each other, and are set to 0 or minus as described above. Even without such blade wrapping, many metal strips are sheared, although the cuts are not well shaped.

In the case of targeting the strip plate which cannot be separated by the drum shear described above, as shown in FIG. 4, the one in which the leveler type dividing roll 16 is provided on the rear surface side of the drum shear 14 is used as a cutting device. To do. Dividing roll 16
4 has a configuration similar to that of a normal leveler roll, and in FIG. 4, one roll is provided on the lower surface of the strip plate 17 and two rolls are provided on the upper surface thereof so as to be eccentric to each other and set so as to bite into the pass line. According to such a cutting device, the strip that has been sheared by the drum shear 14 but cannot be separated is separated while passing through the dividing roll.

[0012]

EXAMPLE An off-gauge portion of a hot-rolled steel strip was cut and removed by an apparatus in which the drum shear shown in FIG. 1 was assembled as shown in FIG. Drum shear 14 with strip 17 with pinch roll 13.
It is configured to be introduced to the dividing roll 16 by the pinch roll 15.

When the plate thickness exceeds 1.0 mm, the drum shear 14 can be used to cut it off. Therefore, the cutting roll 16 is opened by opening the roll up and down, and the cut piece 18 is dropped into the box 19 by the pinch roll 15. It is. Thickness is 0.3 ~
In the case of 1.0 mm, the drum shear 14 could not be cut off, so the cutting roll 16 was operated to cut it off, and the cut piece 18 was dropped into the box 19.

[0014]

Since the drum shear of the device of the present invention uses a helical blade, the cutting reaction force is small and can be made compact as compared with the parallel blade drum shear. It is more compact than the swing type guillotine shear. Moreover, there are advantages that the cost is low, the cutting time is shorter than that of the stop cutting shear, and the like. And in the manufacturing process of strips such as steel strips, strips that are continuously running can be cut almost at right angles to the running direction, and equipment costs and maintenance costs such as blade polishing can be reduced. It can be effectively applied to intermediate materials in the process.

[Brief description of drawings]

FIG. 1 is a perspective view of a drum shear according to the present invention.

2A is a sectional view taken along the line BB of FIG. 1, and FIG. 2B is a sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory diagram of a flat plate helical blade according to the present invention.

FIG. 4 is an explanatory diagram of an example of the present invention.

FIG. 5 is a front view of a conventional device.

[Explanation of symbols]

 1, 2: Drum 3, 4: Flat plate helical blade 5, 6: Rotating shaft 7: Blade edge 8, 9: Gear 10: Cylindrical body 11: Axial plane 12: Cutting surface 13, 15: Pinch roll 14: Drum shear 16: Dividing roll 17: Strip plate 18: Cutting piece 19: Box 21, 22: Twisting helical blade θ: Inclination angle

Claims (2)

[Claims] 1. A drum shear in which a flat plate helical blade is attached to each of the peripheral surfaces of two drums that face each other so as to face each other, and the flat plate helical blade is attached to be inclined with respect to the rotation axis of the drum. The cutting edge has an elliptical shape so that the distance from the rotary shaft to the cutting edge of the flat plate helical blade is equal in the axial direction, and the flat plate helical blade is mounted perpendicular to the drum surface at the center of the drum length direction and facing the drum. A band plate cutting device that is attached so that the laps of the blade edges of both flat plate helical blades engage with each other as the blade rotates. 2. A band plate cutting device comprising the drum shear according to claim 1 and a leveler-type dividing roll installed on the rear surface side of the drum shear.