JPS62107997A - Method and device for shearing sheet metal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for shearing sheet metal, and more particularly to a method and apparatus for shearing strips, such as can body blanks, from sheet metal using a slitter.

Prior art and its problems Japanese Patent Application No. 84731/1984, filed on April 26, 1980, describes problems that occur when welding can body seams using a Sudronik resistance welding machine. It is discussed that the overlapping margin between the edge lines of the two blanks forming the seam is reduced by the downward pressure applied by the electrode roller. As a measure to prevent the overlapping margin of two blank edges from decreasing, the joining surfaces of the two overlapping edges are tilted with respect to the horizontal line, so that the opposing edge of each edge What has been done to prevent its release from the body is shown (Figure 3). In order to incline the joint surfaces of the two edges in this way, a 1.0 cut with a wedge-shaped cross section is made in one edge of the blank on one surface, and a groove on the other edge is made on the other surface. A second notch having the same shape is provided (see Figure 2), the blank is formed into the same cylindrical shape, and the edges of both are overlapped so that the first and second notches are combined. good. The superposition was done like this 2
The notches are the welding points of the resistance welding machine.
Although this method is effective in maintaining the overlap margin of the can body seam inserted into the can body seam at an appropriate value, it takes time and effort to further machine the blank cut to a specified size and make cuts. consumption and causes high costs.

Purpose of the Invention The purpose of the present invention is to manufacture can body blanks etc. from thin sheet materials.
Engineering. ,. □6□yo, E7゜7-Jiang Yi.

It is an object of the present invention to provide a method and an apparatus for shearing a thin plate, which is useful for improving product quality and work efficiency by simultaneously forming cuts necessary for maintaining overlapping margins at the edges of a sheet.

The above object of the present invention is to provide a method for shearing a strip having a predetermined width, such as a can body blank, from a thin sheet material using a slitter. The upper surface of the thin plate material, or the upper disk, in which a notch is left on the upper side of the lower disk between a straight line parallel to the straight line at a predetermined distance, and has an inclined bottom surface that gradually increases in depth from the shear line toward the straight line. This is achieved by the method of shearing a thin plate of the present invention, which is characterized in that the cut is carved on the lower surface of the strip that is rolled down by the lowest point of the strip.

Further, the above-mentioned object of the present invention is to provide a lower disk that rotates within a vertical plane, and an area adjacent to the outer periphery of the lower disk that slides on the area adjacent to the outer periphery of the lower disk, and rotates within a plane parallel to the vertical plane. In a device for shearing a thin plate consisting of an upper disk.

A first notched disk placed in the same plane as the upper disk, with its outer periphery spaced a predetermined distance from the outer periphery of the upper disk, and fixed coaxially to the lower disk, or a first notched disk placed in the same plane as the lower disk. a second notched disc whose outer periphery is spaced apart from the outer periphery of the lower disc by a predetermined distance and coaxially fixed to the upper disc;
According to the apparatus for shearing a thin sheet according to the present invention, each of the cutting disks is provided with a truncated conical surface of a predetermined size on the outer periphery that expands outward from the surfaces of the lower disk and the upper disk. achieved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the method and apparatus of the present invention will be described below with reference to embodiments shown in the accompanying drawings.

Figures 1 and 2 show a can body blank W with cuts 6αt6b formed on both edges by the method of the present invention.

A notch (or recess) 6α having a width B and a depth d is provided on the lower surface of the right end of the can body blank W, and the bottom surface 9α of the notch 6α is inclined by an angle θ with respect to the horizontal line or the lower surface of the blank W. By forming the cut 6α, the right edge of the blank W becomes an edge 11α having a wedge-shaped cross section. A notch 6b having the same width B and depth d is provided on the upper surface of the left end of the blank W, and the notch 6b forms an inclined bottom surface 9b and an edge 11b having a wedge-shaped cross section.

Normally B = 0 ・2~l ・Omm, d= 1/8~
1/4 t (where t is the thickness of the blank).

As shown in Fig. 2, the blank W is rolled into a cylindrical shape and the first
Bring the left end of the blank W shown in the figure below the right end, fit the edge 11h having a wedge-shaped cross section into the notch 6α at the bottom of the right end,
When the tip of the edge 11b abuts against the step 12α of the notch 6α, a seam 13 to be welded is formed. The seam 13 is welded using a resistance welding machine 20.
When the electrode wire 16 is inserted into the station 18 and the upper electrode row 214 is pulled down, a downward force is applied to the seam 13 via the electrode wire 16. However, in the seam 13, the bottom wall 9a of the notch 6α and the bottom wall 9b of the notch 6b are in close contact with each other and are inclined from the upper left to the lower right. Therefore, the right end of the end edge 11α abuts against the step 116, and the left end of the end edge 11b abuts against the step 12α, ensuring an overlapping state with the bottom walls 9α, gb. That is, the inclined bottom surfaces 9α, gb lock the two end edges 11α, 11b in the overlapping position.

Figure 3 (α) shows a normal slitter 30, which includes a lower disk 2 rotating in a vertical plane YY and an upper disk 1 rotating in a vertical plane Y'r adjacent to the YY plane. are supported with areas adjacent to their outer peripheries slidably in contact with each other. The depth of the portion where both disks l and 2 come into contact with each other is set to δ=0.5 degrees. The rotation axis 19 of the upper disk 1 and the rotation axis 21 of the lower disk 2 are placed in the same vertical plane. The upper and lower rotating disks 1.2 each have a ring-like blade made of cemented carbide attached to their outer periphery, and rotate in opposite directions. (d) As shown in the figure, the upper disk 1 is moved clockwise,
When the lower disk 2 is rotated counterclockwise, the blank W is inserted from the right side into the overlapping part of both disks t, 20, i.e. the incision-forming area 3. The thickness of the thin plate used as a can body blank is usually 0.15 to Q.32 mm.

(b) The figure shows a slitter 1OA equipped with such a cutting disc, which is placed in the same plane as the lower disc 2, and whose lowest point on the outer circumference is set at a predetermined level below the highest point of the lower disc 2. A cutting disk 4, which holds the dimensions at a high level, is fixed coaxially to the upper disk 1. The cutting disc 4 is a truncated cone whose part attached to the upper disc 1, that is, the right end, has a diameter d1, and the free end, that is, the left end, is a circle having a diameter d2, and the outer periphery is a truncated cone. It has a conical surface. The values of dl and d2 are as follows cL1==zx(R1-8-1) where R1 is the radius of the upper disk, S is the overlap between the upper and lower disks, and t is the thickness of the blank. Show that.

d2=2 (R1-8-t+c where d is the maximum depth of the cut 6α C) In addition to the cut disk 4 shown in (b), the figure shows the lower disk 2.
A slitter 10B is shown with a cutting disc 5 mounted coaxially on the right side of the slit and placed in the same vertical plane as the upper disc I. The cutting disc 5 is also a truncated conical body, with the left end, that is, the root on the lower disc 2, having a diameter Li3, and the right end, that is, the free end, having a diameter d4. is formed as a truncated conical surface.

The dimensions of d3, t, and d4 are as follows.

cj3 = 2 (R2-8-1) However, R2 is the radius of the lower disk d4 = 2 (R2-8-t + d) When shearing the can body blank, two slitter 1OA shown in Fig. 3 (b) are set at a predetermined interval. When shearing is performed separately, a can body blank W having a notch 6α at one end and not having an additional notch 6b at the opposite end is obtained at the same time as the shearing, but such a can body blank also has a can body seam based on the idea of the present invention. It is useful for the formation of This is because the edge not having the notch 6b is bent to the same slope as the bottom surface 9α of the notch 6α, and by pressing it against the bottom surface 9α of the notch, both edges are locked together. (See Figure 7 of Japanese Patent Application No. 59-84731). Third
When shearing is carried out using two slitters 10B shown in Figure (C) separated at a predetermined interval, notches 6α and 6b are carved on the upper surface of the right end and the lower surface of the left end, respectively, at the same time as shearing. When the blank thus sheared is turned over, a blank identical to that of FIG. 1 is obtained.

Figures 4α, 4h and 4α show the insertion start point and shearing position of the can body blank W inserted into the notch forming area 3 during operation, as well as the relative position to the upper and lower discs l and 2 in the notch forming area. It shows. FIG. 4α shows the insertion start position where the tip (left end) of the blank W is placed on the extension of the diameter (I) of the upper disk l shown in FIG.

Figure 4b shows the blank W immediately after shearing in which the tip of the blank W is placed on an extension of the diameter (It) of Figure 3 (L4).

FIG. 4C shows the sheared blank W2 placed at the highest point of the lower disk 2 on the diameter (2) of FIG.
is rolled down to form a notch 6b, and at the same time, the lowest point of the upper disc l is rolled down on the sheared blank W2 placed at the highest point of the main disc 5 on the extension line of the diameter mark to form a notch 6α. The incision forming area 3 to be formed is shown.

Effects of the Invention Materials whose surface layer of the can body material is plated with a high-resistance substance (for example, TFS) also have the effect of peeling off this surface layer to reduce resistance and improve weldability.

The effects of the present invention are that a can body blank with the required cuts in the required areas can be obtained at the same time as shearing from the can body material, and that the overlapping margin of the two overlapping edges can be determined by forming the can body. A simple locking mechanism that holds the value automatically is obtained. Another advantage of the present invention is that the number of defective products due to the separation of the two edges constituting the can body seam is significantly reduced, and that there is no need to provide a separate process for forming the cuts.

[Brief explanation of drawings]

1 is a sectional view showing a blank processed by the apparatus of the present invention; FIG. 2 is a sectional view showing the blank of FIG. 1 inserted into the welding station of a welding device; and FIG. Figures 4α, 4b, and 4C are cross-sectional views showing the stages of operation of the device of the present invention, and Figure 4α is the start of operation. FIG. 4B shows the shearing completion position, and FIG. 4C shows the cutting completion position. l Upper disc 2 Lower disc 3 Notch forming area 4 Notch disc 5 Notch disc 6α, 6b Notch 7α, 7b Outer circumference 8α of upper disc, lower disc,
Bb Outer circumference of cutting disc 9α, 9b
Bottom surface 10A, IOB Device 11α, l of the present invention
lb End edges 12α, 12b with wedge-shaped cross section
Step 13 Seam to be welded 14
Upper electrode roller 15
Lower electrode roller 16 Electrode wire 18 Welding station 19 Upper disk rotation axis 20
Resistance welding machine 21 Lower disc rotation axis 30
Regular slitter grass 3 eyes

Claims (2)

[Claims] (1) In a method of shearing a strip having a predetermined width, such as a can body blank, from a thin sheet material using a slitter, almost simultaneously with the shearing of the strip, a slitter is placed between the shear line and the shear line at a predetermined distance from the shear line. A cut having an inclined bottom surface that gradually increases in depth from the shear line toward the straight line is made between the parallel straight line and the upper surface of the thin plate material left on the upper side of the lower disk or the lowest point of the upper disk. A method for shearing a thin plate, characterized in that an inscription is made on the underside of the strip to be rolled down. (2) A thin plate consisting of a lower disk that rotates in a vertical plane and an upper disk that rotates in a plane parallel to the vertical plane by sliding an area adjacent to the outer periphery along the area adjacent to the outer periphery of the lower disk. In a shearing device, a first cutting disk or a lower disk is placed in the same plane as the upper disk, has an outer periphery spaced a predetermined distance from the outer periphery of the upper disk, and is coaxially fixed to the lower disk. a second notched disk placed in the same plane as the first notched disk, whose outer periphery is spaced a predetermined distance from the outer periphery of the lower disk, and coaxially fixed to the upper disk, wherein the first and second notched disks are 1. A device for shearing a thin plate, characterized in that the outer periphery is provided with a truncated conical surface of a predetermined size that expands outward from the surfaces of the lower disk and the upper disk.