JP2002052416A - Blank material slitting method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slitting method and apparatus capable of simply slitting blank materials different in length from a raw material sheet metal at a low cost. SOLUTION: A first blanking die 13 having rectilinear cutting edges 11,12 at a designated angle θ of inclination adjustable to the feed direction of the raw material sheet metal 1, and a second blanking die 16 having a rectilinear cutting edges 14, 15 at a designated angle θ' of inclination are mounted on a common elevating table 20 at a space a of arrangement. After the raw material sheet metal 1 is cut by the first blanking die 13 on the downstream side with respect to the feeding direction of raw material sheet metal, the raw material sheet metal 1 is fed in a first feed mode by a distance c. The raw material sheet metal 1 is cut by the second blanking die 16 on the upstream side to slit a blank material 2 with a length of b=a+c. After that, the raw material sheet metal 1 is fed in a second feed mode by the distance a+b, and again cut by the first blanking die 13 to slit the second blank material 2 with a length of b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting method and a cutting device for cutting a blank material from a long sheet metal such as a steel strip by using two blanking dies.

[0002]

2. Description of the Related Art Panel materials and the like used for vehicle bodies are:
It is cut out from a long sheet metal such as strip steel by a blanking die. As a device used in this cutting step, a cutting device 30 in FIG. 5 and a cutting device 40 in FIG. 7 are known. The blank material cut out by these devices is often a trapezoidal blank material 2 as shown in FIG.
The trapezoidal blank 2 has upper and lower sides 3 and 4 which are parallel to each other, and inclined side sides 5 and 6 which intersect the upper and lower sides 3 and 4 at angles θ and θ ′. Here, the length b of the blank 2
Is the length between the midpoints of both sides 5, 6.

A cutting device 30 shown in FIG. 5 cuts a blank material 2 one by one from a sheet metal 1 fed from a steel strip coil, and cuts the blank material 2 one by one. , 33 with one blanking mold 34
Is installed. The material sheet metal 1 is fed between the pair of upper and lower cutting edges 32 and 33, and the upper movable cutting edge 33 is reciprocated one time in the vertical direction, whereby the material sheet metal 1 is cut at a linear position crossing the width direction. In addition, by rotating the rotary table 31, the angle in the width direction cut by the cutting blades 32, 33 of the material sheet metal 1 is set to either θ or θ ′. For example, as shown in FIG.
4 and cut the material sheet 1 once with the cutting edges 32 and 33 having the feed direction and the inclination angle θ, and then feed the material sheet metal 1 by the length b, while rotating the rotary table 31 to rotate the cutting edge 3.
The blank angle 2 is formed by changing the inclination angles of the reference numerals 2 and 33 to θ ′ and cutting the sheet metal 1 at the inclination angle θ ′ as shown in FIG. 6B.

On the other hand, the cutting device 40 shown in FIG.
Blanking die 4 having straight cutting edges 41, 42 of
3, and a second cutting edge 44, 45 having straight cutting edges 44, 45 having an inclination angle θ ′.
The blanking die 46 is installed on a lift table 47 which is raised and lowered by a common cutting press. A pair of front and rear first blanking die 43 and second blanking die 46 are arranged at a constant pitch b. When the blank 1 is fed in the direction in which the blanking dies 43 and 46 are arranged, the blanking dies 43 and 4 are moved.
6 operate once at the same time, and two front and rear portions of the material sheet metal 1 are simultaneously cut as shown in FIG. 8A, and one blank material 2 having a length b is cut out. Thereafter, the material sheet metal 1 is fed at a pitch 2b twice as long as the blank material length b, and each time each of the blanking dies 43 and 46 operates once, as shown in FIG. Materials 2 and 2 are cut out.

[0005]

The cutting device 30 shown in FIG.
Is suitable for cutting blanks of various lengths without any restrictions on the length of blanks, but the rotary table must be rotated each time the sheet metal is fed once. However, there is a problem that the rotary table has a precise and complicated structure, and the equipment cost of the whole cutting device increases.

The blank material cutting method using the cutting device 40 shown in FIG. 7 is excellent in mass productivity because two blank materials can be obtained by operating the press machine once, and has a high precision driving like a rotary table. Although control equipment is not required and equipment costs can be easily reduced, the length of the trapezoidal blank and the inclination angles of both sides are fixed, and these lengths and inclination angles cannot be changed. There was a problem that it was not possible to cut out blanks longer than the machine head dimensions.

[0007] It is an object of the present invention to provide a blank material cutting method and a cutting device excellent in versatility and high-performance which incorporate the advantages of the two cutting methods and eliminate the disadvantages.

[0008]

According to the blank material cutting method of the present invention, a first blanking die and a second blanking die are sequentially arranged at a distance a from a downstream side in a feeding direction of a material sheet metal. A blank material cutting method for cutting a blank material having a predetermined length b longer than an interval a by a linear cutting blade arranged in each blanking mold, wherein (A) the material blank is cut into the first blanking mold. A first step of cutting only with
(B) a second step of feeding the material sheet metal by a distance c obtained by subtracting the interval a from the length b, and (C) a third step of cutting the material sheet metal only by the second blanking die. , (D) a fourth step of feeding the sheet metal by a total distance a + b of the interval a and the length b is sequentially repeated.

Here, the length b of the blank material is the length of the intermediate point between the inclined sides of the trapezoidal blank material. When the sheet metal is sent to a pair of blanking dies, the first
One blank is cut out in the next second cutting step from the cutting step, and one blank is cut out in each of the subsequent first and second continuous cutting steps. In this case, the length b (= a + c) of the blank material to be cut out can be changed by arbitrarily changing the pitch c or a + b, which is the feed amount of the sheet metal once.
Can be changed arbitrarily. Further, the first blanking die and the second blanking die which are arranged in a pair in the feeding direction of the material sheet metal are installed on a common cutting press so that either one of them is operated independently.

In the blank material cutting apparatus of the present invention, a first blanking type and a second blanking type are sequentially arranged at a distance a from a downstream side in a sheet metal feeding direction. What is claimed is: 1. A blank material cutting device for cutting a blank material having a predetermined length b longer than an interval a by an arranged linear cutting blade, wherein the sheet metal is fed by a distance c obtained by subtracting the interval a from the length b. Feeding means for alternately repeating a first feeding mode for feeding, a second feeding mode for feeding for a total distance a + b of the interval a and the length b, and two of the first and second blanking types. A lift table on which a movable linear cutting blade is attached and which is moved up and down by a cutting press; and wherein the two movable linear cutting blades are arranged between the two movable linear cutting blades and the lifting table. To selectively move either one of them to the non-cutting position. And means, a first step of cutting only (A) the material metal sheet the first blanking type,
(B) a second step of feeding the sheet metal in a first feed mode, (C) a third step of cutting the sheet metal only with the second blanking die, and (D) cutting the sheet metal. The fourth step of feeding in the second feeding mode is sequentially repeated.

When the first blanking type and the second blanking type are installed on a common press, the first and second blanking type linear cutting blades are arranged so that the cutting angle can be changed. It is desirable to be disposed rotatably with respect to the cutting press. In this way, it is easy to cope with a change in the inclination angle of both sides of the trapezoidal blank material, and it is easy to cut out various types of blank materials having different shapes and dimensions.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS. The embodiment shown in the drawing relates to a cutting device and a cutting method for cutting a trapezoidal blank material 2 having the dimensions shown in FIG. 4 from a material sheet metal 1. The blank material cutting device 10 shown in FIG. On the other hand, a first blanking die 13 having a pair of upper and lower linear cutting blades 11 and 12 having a predetermined inclination angle θ, and a second blanking die having a pair of upper and lower linear cutting blades 14 and 15 having a tilt angle θ ′. 16 is installed on a common cutting press having a fixed table 20a and a lifting table 20b. Each of the two blanking dies 13 and 16 is attached to the fixed base 20a and the elevating base 20b of the cutting press by interposing, for example, horizontally rotatable adjustment bases 21 and 22 so that the two blanking dies 13 and 16 are mounted. The directions of the linear cutting blades 11, 12 and the linear cutting blades 14, 15 of the ranking dies 13, 16 can be adjusted to an arbitrary inclination angle with respect to the material sheet metal feeding direction. Such an adjustment table 2
1 and 22 can be applied with a simple structure having a manual adjustment screw (not shown). In addition, both blanking type 1
For example, the horizontal slides 3 and 16 in which the movable cutting blades 12 and 15 disposed on the elevating platform 20b of the press machine are driven by an air cylinder or the like so that one of the cutting operations is performed independently to cut the material sheet metal 1. The wedge members 23 and 24 are provided so as to be able to move up and down independently. Such a moving means is not limited to the horizontal slide type wedge members 23 and 24, and it is also possible to use a cylinder which can be shifted up and down two positions by, for example, hydraulic pressure.

The blank material cutting device 10 shown in FIG. 1 is provided with a feeding means (not shown) for the material sheet metal 1 and an unloading mechanism for the blank material cut and separated from the material sheet metal 1. In addition,
FIG. 1 shows, for example, a holding roller 17 and a conveyor 19 as means for smoothly performing blank material cutting by the method of the present invention. The holding roller 17 assists blank material cutting and unloading operations by holding the blank material 2 obtained by cutting the material sheet metal 1 by the second blanking die 13 through a spring 18 under elastic pressure. The conveyor 19 is used for feeding and unloading the sheet metal 1 and the blank 2.

The first blanking die 13 is installed downstream of the common fixed base 20a and the elevating base 20b in the sheet metal feeding direction, and the second blanking die 16 is installed upstream. As shown in FIG. 2A, assuming that the length b between the intermediate points on both sides of the trapezoidal blank material 2 cut out is the sum a + c of two arbitrary dimensions a and c, both front and rear blanking are performed. The arrangement interval of the dies 13 and 16 is set to a, and FIG.
As shown in (B), the inclination angle of the first blanking die 13 on the downstream side with respect to the sheet metal feeding direction is set to θ, and the inclination angle of the second blanking die 16 on the upstream side is set to θ ′. The pair of blanking dies 13 and 16 are individually and alternately operated once each in the manner shown in FIG. 3 to continuously cut blank materials 2 one by one from the sheet metal 1.

A feeding means (not shown) for the sheet metal 1 includes a first feeding mode for feeding a distance c obtained by subtracting the interval a from the length b, and a total distance a + of the interval a and the length b.
The second feeding mode for feeding only b is alternately repeated.

The blank material cutting device of the present invention is configured as described above, and the following first to fourth steps are repeatedly executed by this device in order.

First step: The material sheet metal 1 is cut only by a first blanking die.

Second step: The sheet metal 1 is fed by a distance c obtained by subtracting the interval a from the length b in the first feeding mode of the feeding means.

Third step: The material sheet metal 1 is cut only by the second blanking die.

Fourth step: The sheet metal 1 is fed in the second feeding mode of the feeding means by a total distance a + b of the interval a and the length b.

More specifically, when the sheet metal 1 is first sent to a pair of front and rear blanking dies 13 and 16, first, FIG.
As shown in (A), only the first blanking die 13 is operated once to cut one portion of the material sheet metal 1 at an inclination angle θ. Hereinafter, this cutting step is referred to as a first cutting step C-1. Next, as shown in FIG. 3B, after the material sheet metal 1 is fed by the distance c in the first feeding mode, only the second blanking die 16 is cut once as shown in FIG. 3C. Then, one portion of the material sheet metal 1 is cut at an inclination angle θ ′. Hereinafter, this cutting step is referred to as a second cutting step C-2. In the second execution of the second cutting step C-2, one blank material 2 having a predetermined length b = a + c is cut out from the material sheet metal 1. next,
As shown in FIG. 3D, the material sheet metal 1 is fed by the distance a + b in the second feeding mode, and immediately thereafter, only the first blanking die 13 is cut again once as shown in FIG. 3E. The first cutting step C-1 is performed. The second blank material 2 is cut out by performing the second first cutting step C-1. Thereafter, the cutting cycle is repeatedly performed, and the cut blank materials 2 are sequentially carried out to the outside by the conveyor 19.

The blank material cutting apparatus 1 of the above embodiment
In the case of 0, the length a of the blank material 2 to be cut can be variously adjusted only by adjusting the feed amount of the material sheet metal 1 at one time, similarly to the cutting device 30 in FIG. By adjusting the length a, it becomes easy to cut out a blank material having a length equal to or larger than the head size of the common fixed base 20a and the lift base 20b that support the blanking dies 13 and 16. In addition, the first and second parts of the cutting device 10 shown in FIG.
Since the inclination angles of the blanking dies 13 and 16 are determined in advance to desired values, the structure of the entire apparatus is simplified by eliminating the need for a high-precision rotary table and its control mechanism as in the cutting device 30 in FIG. Costs can be reduced. In the cutting device 10 shown in FIG.
3 and 16 are attached to the common fixed base 20a and the elevating base 20b so that the inclination angle can be adjusted, so that it is possible to easily cope with cutting out a plurality of types of trapezoidal blank materials having different lengths and inclination angles on both sides. Is further improved.

Although the embodiment of the present invention has been described above, the present invention can be variously modified in addition to the above embodiment. For example, in the above embodiment, the trapezoidal blank material 2 was cut out. Of course, the present invention can be applied to the cutting of blank materials other than trapezoids. For example, the present invention is also applicable to the cutting of blank materials whose both sides are unequally inclined in the same direction.

[0024]

According to the present invention, the length b of the blank material to be cut can be arbitrarily changed by arbitrarily changing the feed amount of one sheet metal at a time, and is larger than the head size of the press machine. It is also easy to cut out blanks of different lengths, and it is possible to cut out various types of blanks with different shapes and dimensions to improve versatility. It is possible to provide an inexpensive blank material cutting device that requires a small power for cutting a material sheet metal and has a simple structure.

[Brief description of the drawings]

FIG. 1 is a side view of a blank material cutting device showing an embodiment of the present invention.

2A is a plan view of a blank material cut by the cutting device in FIG. 1, and FIG. 2B is a plan view showing an arrangement relationship between the blank material and a pair of blanking types.

3 (A) to 3 (E) are plan views of a material sheet in each step of cutting a material sheet by a cutting device in FIG. 1 to cut out a blank material.

FIG. 4 is a plan view of a blank material.

FIG. 5 is a partial perspective view of a conventional blank material cutting device.

6 (A) and 6 (B) are plan views of a material sheet in each step of cutting a material sheet metal by a cutting device in FIG. 5 to cut out a blank material.

FIG. 7 is a side view of another conventional blank material cutting device.

8 (A) and 8 (B) are plan views of a material sheet in each step of cutting a material sheet metal and cutting out a blank material by the cutting device in FIG. 7;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet metal 2 blank material 10 blank material cutting device 11, 12 linear cutting blade 13 first blanking die 14, 15 linear cutting blade 16 second blanking die 20a press machine fixed base 20b press machine lift platform

Claims (2)

[Claims] 1. A linear cutting blade in which a first blanking type and a second blanking type are sequentially arranged at a distance a from a downstream side in a feeding direction of a material sheet metal, and are arranged in each blanking type. A blank material cutting method for cutting a blank material having a predetermined length b longer than the interval a by the following method: (A) a first step of cutting the material sheet metal only by the first blanking die;
(B) a second step of feeding the material sheet metal by a distance c obtained by subtracting the interval a from the length b, and (C) a third step of cutting the material sheet metal only by the second blanking die. (D) a blank material cutting method, wherein a fourth step of feeding the material sheet metal by a total distance a + b of the interval a and the length b is repeated in order. 2. A first blanking die and a second blanking die are arranged in order from a downstream side along a sheet metal feeding direction at an interval a, and linear cutting blades are arranged in each blanking die. A blank material cutting device for cutting a blank material having a predetermined length b longer than an interval a, wherein the sheet metal is fed by a distance c obtained by subtracting the interval a from the length b. Feeding means for alternately repeating a second feeding mode for feeding a total distance a + b of the interval a and the length b, and two movable-side linear cutting blades of the first and second blanking types are mounted. A lift table that is moved up and down by a cutting press, and is disposed between the two movable-side linear cutting blades and the lift table, and one of the two movable-side linear cutting blades is placed in a non-cutting position. (A)
A first step of cutting the sheet metal using only the first blanking die, (B) a second step of feeding the sheet metal in a first feed mode, and (C) a step of cutting the sheet metal into the second sheet. A blank material cutting device, wherein a third step of cutting only with a blanking die and (D) a fourth step of feeding the material sheet metal in a second feed mode are sequentially repeated.