JPS6020123B2 - slitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of the slitting method and apparatus described in Mochigan No. 12401/1986.

According to the prior art, a rotatable cylindrical, circular or table-shaped upper cutter and lower cutter apply a shearing action to the material passing between them, forming a bite on the surface of the material. , the step of transporting the material with the bites forward, the step of passing this material between a pair of reduction rolls, and the step of pushing back the part protruding from the surface of the material by the reduction roll, A slitting method is provided, characterized in that the pushing back operation of the part is performed with a cylindrical reduction roll.

According to the specification, an upper cutter and a lower cutter having a cylindrical shape, a circular shape, or a table shape are arranged facing each other so as to be rotatable with each other, and a pair of cylindrical cutters arranged in front of the conveyance path of the cutters are provided. There is provided a slitting device comprising a roll, the cylindrical roll being a reduction roll.

According to such a slitting method or apparatus, no burrs (also referred to as burrs) are generated on the end face of the slit product. The outside of the cutter used in such a slitting device is usually assumed to have a sharp cutting edge. Depending on the conditions, sudden chipping of the cutter edge may occur during the regular process of shearing the cutter (hereinafter referred to as the first process), resulting in an extremely shortened cutter life. there's a possibility that.

Such defects naturally occur in conventional slitting methods, and are particularly noticeable when the cutter is made of a material such as cemented carbide, which is extremely hard but has poor malleability. be. Generally speaking, in order to prevent such problems, it is best to reduce the stress concentration that occurs on the cutter edge when it bites into the material, such as by rounding the edge of the cutter. One possible method is to apply chamfering. In this case, as the roundness (hereinafter referred to as R) or the chamfer (hereinafter referred to as C) of the blade edge increases, the effect of preventing the chipping phenomenon of the blade edge increases. However, if such a prevention method is adopted in the subordinate slitting method, the size of burrs that inevitably occur during slitting will increase in proportion to the size of R or C. Another problem will occur. It is well known in the industry that one of the biggest requirements for improving the quality of slitting products is to make the burrs as small as possible. It is obvious that it is not normally done to provide R or C, and even in cases where it is absolutely necessary to blunt the shape of the cutting edge, such as with carbide cutters, the maximum size of R or C is the burr that occurs. In terms of size, it was limited to a maximum of 0.01 to 0.02 ribs. However, in the burrless slitting method described in the above specification, which is an invention of the present applicant, it has been found that it is possible to positively form R to C on the cutter edge, as will be described in detail below. Furthermore, according to the experimental results, in the above-mentioned burrless slitting method, compared to the case where the cutting edge is sharpened by providing R or C on the cutting edge, the material partially sheared in the first step is pressed by the reduction roll. The first process that allows a slit product without burrs to be obtained in the process of adding a return operation (hereinafter referred to as the second process)
It has also been found that the so-called successful cutter overlap area of the process can be increased, generally speaking at least not decreased.

Therefore, a first object of the present invention is to provide a device for preventing the cutter edge chipping during operation of the cutter used in the first step in the above-mentioned barbless slitting device.

A second object of the present invention is to provide a device for increasing the successful overlap area in the burrless slitting device described above.

The present invention will now be described in more detail with reference to the accompanying drawings.

1a and 1b show preferred cutter edge shapes of the present invention.

First, a description will be given of the rounded cutter (FIG. 1a), which is a particularly desirable cutter edge shape of the present invention. As explained above, in the conventional slitting method (that is, the method of simply dividing the material in the first step), if a radius is provided on the cutter edge, a burr will occur that is approximately proportional to the size of this radius. However, it was not desirable to actively provide a radius on the cutting edge. However, in the above-mentioned burrless slitting method, even if the cutter edge is actively provided with R, the shape and accuracy of the cross section perpendicular to the conveying direction of the slit product do not substantially change compared to the case where R = 0. It has been found. Figure 3 shows the cutter edge R and the cutter edge R, using the inter-cutter clearance CL (lateral gap, positive when the cutters are apart from each other, expressed as a relative value to the plate thickness) as a parameter (see also Figure 4). The relationship between the shapes of the slit product cross section (section viewed along the line D-Rho in the second figure) is shown. The value of the overlap in Figure 3 was determined to be the value at an appropriate successful overlap because it has been found from experimental results that it has little effect on the cross-sectional shape as long as it is in the region that results in burrless slitting. be. Now, as shown in Figure 3, in the above-mentioned Kaerijo slitting method, generally speaking, even if the radius is quite large, such as 0.02 ribs (in this case, 12.5% of the plate thickness), the slit product It can be seen that the cross-sectional shape is not much different from the case where R=0. In particular, when the clearance CL is a small value near zero, such as -3.1%, 0%, or 13.1% (relative value to the plate thickness), even if R becomes large, the cross-sectional shape of the slit product will be R =
It will be understood that there is virtually no difference from the case of 0. In Figures 4A and 4B, 1 and 2 and 1' and 2' indicate the upper cutter and lower cutter in the first process (Figure 4A), and 3 and 4 indicate the reduction rolls in the second process (Figure 4B). It is. Further, t indicates the material thickness. Next, Fig. 5 shows the width dimension difference of the slit product (the difference between B and the base in Figs. 4A and B).
B=B-law) is expressed on the vertical axis, and how this changes with changes in R is expressed on the axis of clearance.As can be seen from this figure, even if R changes, the slit It can be seen that the accuracy of the width dimension of the product does not change much, especially when the clearance is 0 or negative.

Figure 6 shows the overlap area where burrless slitting is successful (in the figure, the overlap is L and the plate thickness is t).

. An example of the relationship between (shown as %) and clearance is shown.
By choosing the balance slightly negative, R=0
It is possible to obtain a significantly larger successful overlap region than in the case of R=0 (in this figure, it is approximately 2
It can be seen that Obtaining such a large overlap area means that the allowable deflection value of the shaft that carries the first process cutter in gang slitting (multi-line slitting) can be increased.
This has the effect of making it easier to succeed in the burrless slitting described above compared to the case of 0. Figure 7 shows the relationship between the cutting edge R and the successful overlap area at clearances of -3.1%, 0%, and 13.1%, which are practically desirable clearances in terms of not deteriorating the width dimension accuracy. It is shown.

As can be seen from this figure, it has been found that within a certain limit, as R increases, the successful overlap does not almost decrease, but rather tends to increase, taking into account the dispersion of experimental results. All of the experimental results so far have been related to sintered anchor mild steel plates with a plate thickness of t=1.6, but other plate thicknesses and plate materials, such as stainless steel, brass, copper, etc.
Similar trends to those described above have been obtained for metal materials such as aluminum.

From all these experimental results, it has been found that the above-mentioned limit value of R depends on the plate thickness and clearance. As mentioned above, the desired effect of the present invention can be obtained by adding a radius to the cutter edge, but depending on the material, the same effect can be obtained by chamfering the cutter edge C (see Figure 1b).
It turns out that it can also be obtained by adding .

The invention is not limited to the embodiments described above.

For example, in the push-back step in the second step, the gap between a pair of opposing roll-down rolls is made much smaller than the thickness of the material, and the surface of the material passing under the roll-down rolls is rolled to give a glossy finish to the surface of the final product. can. Furthermore, according to the present invention, since the materials are in an unseparated state in the first step, the sides or surface of the materials can be easily guided when the materials are transferred to the second step, and the lateral sides or surfaces of the materials can be easily guided when the materials are transferred to the second step. It has the advantage of easily preventing curling, which is convenient for improving the accuracy of the final product.

Furthermore, the device according to the present invention can be used in any of the various known slitting methods, such as pull cut, drive cut, and pull and drive cut, and the device can be used in any of the known slitting methods, such as pull cut, drive cut, and pull and drive cut. Of course, it is also possible to apply a tensile force (pull blade) to the blade.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the preferred shape of the cutter blade used in the present invention, FIG. 2 is a perspective view of a burrless slit product, FIG. 3 is a diagram showing the relationship between the cutter blade R and the cross-sectional shape of the slit product, and FIG. Figures 4A and 48 are diagrams showing the relationship between the cutter spacing and the width dimension of the slit product in the burrless slitting method, and Figure 5 is a diagram showing the relationship between the width dimension accuracy of the burrless slit product and the cutter cutting edge R. Figure 6 is a diagram showing the relationship between the overlap area and clearance for successful burrless slitting with and without a radius on the cutting edge, and Figure 7 is the relationship between the size of the radius of the cutting edge and successful overlap slitting. Figures showing each are shown. Figure 1 Figure 2 Figure 3 Figure 4A Figure 4B Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. An upper cutter and a lower cutter of cylindrical or conical shape, which are arranged rotatably facing each other and apply a shearing action to the material passing between them and form bites on the surface of the material; A pair of rotatable cylindrical rolls are arranged in front of the material conveyance path of the cutter and roll down the material on which the biting has been formed to separate the material, and the cutting edges of the upper and lower cutters are rounded. Alternatively, a slitting device characterized by being chamfered. 2. The slitting device according to claim 1, characterized in that the clearance between the upper and lower cutters is in a 0% or negative range as a relative value to the thickness of the material to be slit. slitting device. 3. The slitting device according to claim 1 or 2, wherein the distance between the reduction rolls in the vertical direction is set to be slightly smaller than the thickness of the material. Device. 4. In the slitting device according to any one of claims 1 to 3, the side or surface of the material is guided until the material reaches the reduction roll to prevent the material from being conveyed. A slitting device characterized in that it is provided with means for preventing lateral twisting.