JPH04294460A - Blank array drawing forming system - Google Patents

Abstract

PURPOSE:To automatically form a blank array drawing capable of maximizing yield. CONSTITUTION:A blank drawing 5-1 is formed by applying the offset of bar width (sending bar data) Sa to an original blank drawing. The drawing 5-1 is rotated around a reference point (Xk, Yk) twice in each reference point (Xk, Yk) to determine a blank angle as alphai. In each rotation, intersecting points x1, x2 between a line y=a+i which is parallel to X axis and the blank 5-1 with the offset, an array pitch Pi maximizing a difference between both the intersecting points x1, x2 is obtained, material width Wi is calculated, and Wi x Pi (the area of a material used in each product) is calculated. After rotating the drawing 5-1 0 to 180 deg., the operation is ended and a blank angle (alpha0 corresponding to the minimum WiXPi (W0XP0) is obtained. The original blank drawing is arrayed by using the W0, P0 and alpha0 respectively as the material width, the array pitch and the array angle.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blank arrangement diagram creation system for automatically creating a blank arrangement diagram used when creating a layout diagram in mold design using CAD or the like.

0002

2. Description of the Related Art Conventionally, stamped frames (products) have been extracted from plate materials such as sheet metal using molds. This is done by feeding the sheet metal material between the upper and lower molds arranged in the order of the processes, for example, in the first process, a pilot hole is punched, in the next process one hole is punched, stamped, and then the next process is performed. In the process, the work proceeds as follows: outline cutting, then chamfering, hole punching, restriking (insertion before punching), and then punching out in the final process. Depending on the shape of the product to be removed in the final process, additional intermediate processes such as scoring, pre-bending, and bending may be necessary.Also, if the shape is simple, only a few steps are required. .

By the way, when designing a mold for each process used in the above-mentioned work, first, a layout drawing (
A process drawing) is created, and the arrangement order, arrangement interval, arrangement angle, etc. of the molds for each process are set based on this layout drawing.

[0004] In order to create this layout diagram, it is necessary to create a blank (developed product diagram) array diagram as a first step. For example, as shown in Figure 7,
The blanks 7-2 are arranged on a sheet metal 7-1 having a width of W mm, while providing a fixed dimension predetermined according to the thickness of the plate material, and a width of the feed bar Sa and edge bar Sb.

This blank arrangement diagram is for setting the production yield of the product (blank 7-2) to the best (maximum) for the plate material (sheet metal) 7-1 shown in FIG. That is,
With the aim of minimizing raw material (board) costs,
This is a drawing in which a mold is made to minimize the amount of raw material scrap after the product is removed. Then, a layout diagram was created based on this blank array diagram.

Conventionally, the method of creating a blank array diagram is as follows:
It is as follows. In FIG. 7, first, the plate material 7-
1, the wasted part R-1 at the beginning of the process and the wasted part R-2 at the end of the process (both indicated by diagonal lines) are the waste parts R-1 and R-2 at the end of the process, assuming that the number of products 7-2 to be removed is sufficiently large. Since the percentage is small, it can be ignored as a material loss. Then, in the same figure, the amount of plate material (area) P x W, which is expressed as the product of the arrangement pitch length P and the width W of the plate material for product 7-2, becomes the amount used including loss per product. . If the usage amount including loss per product (plate material area) is set to the minimum, then the raw material cost will be minimized.

Based on the above-mentioned principles, a blank 7
After tentatively setting the angle, arrangement pitch, etc. of -2, measure the arrangement pitch length P and the width W of the plate material, calculate P x W, and determine that P x W is the minimum (maximum yield). I kept repeating simulations to make sure it worked. Of course, this manual work is performed while taking into account the predetermined widths of the feed bar Sa and edge bar Sb within the measurement dimensions.

[0008] In recent years, mold designs and layout drawings have been created using CAD, but the creation of the above-mentioned blank arrangement diagrams, which are the basis of their creation, is still done manually.

[0009]

[Problem to be Solved by the Invention] However, as described above, while repeating trial and error simulations manually, each time the arrangement pitch length of the blanks and the width of the plate material are measured, integrated, etc. The problem is that the task of obtaining the best data from a computer is extremely troublesome, time-consuming, and inefficient.

[0010] Furthermore, the data obtained as the best through repeated simulations as described above is the best data in the simulation, and it is unclear whether it is actually the best data or not. There was a problem that there was no guarantee that it was the best.

An object of the present invention is to automatically create a blank array diagram that maximizes the yield.

0012

Means for Solving the Problems The means of the present invention are as follows. Input means 1 (see the functional block diagram in FIG. 1) inputs blank data. The means include, for example, a keyboard, a mouse, a touch pen, and the like.

Next, the calculation means 2 calculates a blank angle that provides the best yield for the input blank data. The means is, for example, a CPU (central processing unit) chip.

The plotting means 3 produces a blank arrangement diagram based on the blank arrangement pitch and material width at the blank angle that yields the best yield as determined by the calculation means 2. The means is, for example, a CRT display.

[0015]

[Operation] The operation of the means of the present invention is as follows. first,
When blank data is input by the input means 1, the calculation means 2 calculates the blank angle at which the yield is the best for the blank data. Then, the drawing means 3 creates a blank arrangement diagram based on the blank arrangement pitch and material width at the blank angle at which the yield is the best.

[0016] Therefore, when blank data is input, a blank array diagram is automatically created.

[0017]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 2 to 6. First, FIG. 1 is a system configuration diagram of an embodiment. In the figure, a CPU 21 is a central processing unit that operates according to a microprogram stored in a built-in ROM (read-only memory), not shown, to control the entire system. In addition, the memory 24
Various calculations are performed using operating programs, data, etc. stored in the computer.

The keyboard 22 includes a plurality of keys for inputting various data and operation commands. Then, by key operation, the parameters for drawing a blank,
That is, blank data is input, or a command to call up stored blank data from a storage area of the memory 24, which will be described later, in which blank data is stored in advance is input.

Note that the keyboard 22 may be composed of a mouse or a touch pen instead of a keyboard. In this case, a data menu for input, a command menu, etc. are displayed on the screen of the display 23, which will be described later. Then, the user inputs data or commands by selecting them from the displayed menu using a mouse or a touch pen.

The display 23 performs blank drawing etc. based on input data. Furthermore, the best blank array diagram is displayed based on data such as array angles obtained based on the calculation results by the CPU 21.

The storage device 24 is composed of a RAM disk, a register, a bitmap memory, etc., and various data are written and read by the CPU 21. The operation of one embodiment of the above configuration will be explained using the flowchart of FIG. 3. This process is carried out by the keyboard 22 shown in FIG.
After blank data is input from the CPU 21
carried out by. Further, in this process, various registers as described below provided in the dot map memory DITTO and the storage device 24 are used by the CPU 21, although not particularly shown.

That is, register αRi stores blank array angle data αi. The register PRi stores blank array pitch data Pi when the blank array angle data is αi.

Register WRi also contains plate width data W.
Remember i. Similarly, the register ARi stores data Ai on the area of the plate material used per blank.

Registers α0, P0, W0, and A0 are registers SR that store the best values of each of the above data, respectively.
a stores the feed bar data Sa.

Register SRb stores edge rail data Sb. Note that in the above, i=1, 2, . . . m. Furthermore, the contents of each of the above registers are all cleared at the start of processing.

It is also assumed that, in addition to inputting blank data, thickness data TH of the plate material is inputted in advance from the keyboard 22. First, in the first process, based on input of blank data from the keyboard 22, for example, a blank 4-1 as shown in FIG. 4(a) is drawn on the display 23. And also keyboard 2
The sun width (
The feed bar data) Sa and the edge bar data Sb are calculated. Then, the obtained calculation result is
They are stored in registers SRa and SRb, respectively (step S1).

[0027] The values of the above-mentioned width and width differ slightly depending on the material of the plate material, but usually they are both determined by the thickness of the plate material TH x 1.5, and Sa=Sb. Next, a blank with an offset is created based on the sun width Sa obtained in the register SRa (step S2
).

This process is performed on the original blank 4-1 shown in FIG. 4(a) drawn on the display 23, as shown by the hatched area in FIG.
．． 5 (that is, half of the sun width Sa) is added. This offset addition process begins with the outline drawing data for blank 4-1 in Figure (a) (coordinate parameters that specify two points of individual straight lines or curves that consecutively form the outline at their intersections). , are moved by the value of sun width Sa×0.5 in the direction of a perpendicular line erected outside the outer shape. Then, by performing the intersection point correction, an offset blank 4-2 shown in FIG. 4(b) is obtained.

The reason why an offset of sun width Sa×0.5 is added to the original blank 4-1 will now be explained. This is based on the fact that when the offset blanks 4-2 are arranged, the close contact portion thereof is the closest portion of both adjacent offset blanks 4-2. That is, the closest point for the offset blank 4-2 is also the closest point to the original blank 4-1, where both are in close contact with each other.
The offset that exists between both sides in this part is (Sa×0.5
)+(Sa×0.5), that is, the sun width Sa.

[0030] In this way, if the array diagram is created using the blank 4-2 with an offset of sun width Sa x 0.5, the complicated procedure of setting the sun width Sa at the closest point becomes unnecessary. By simply finding the optimal arrangement from among the arrangements formed in close contact with each other, it is possible to obtain an arrangement diagram of the original blank 4-1 in which the sun width Sa is set at the closest portion.

Following step S2 in FIG. 3, the offset blank 4- created in step S2 is
2 is rotated by a predetermined angle, for example, 2 degrees, counterclockwise around the reference point (Xk, Yk). Then, the angle αi (initially i=1) after rotation at this time is stored in the register αRi (step S3).

The above-mentioned reference point may be arbitrarily set. For example, if there is a point that serves as a reference point in processing the blank or in assembling function, such a point may be designated. Here, FIG. 5(a) shows a rotated offset blank 5-1 (same as the offset blank 4-2 in FIG. 4(b)). Figure 5(a) shows the state when the angle is αi with respect to the X axis after rotating i times by 2 degrees (i = 1, 2, ...90 (=180/2)). It is something that

Following step S3, a line parallel to the X axis, y=a+j (a is a constant, j=0, 1, 2...m), is drawn on the rotated offset blank 5-1. is set (see Figure 5(b)). And that y=a
The minimum value x1 and maximum value x2 of the X coordinate of the intersection of +j and the offset blank 5-1 are determined. Then, the difference value between the two (the absolute value of (x2-x1), that is, the length of the cutting line parallel to the X-axis) is stored in a work register xRj (not shown) of the storage device 24. And this process is
y=a+ that touches the offset blank 5-1 at the bottom
The process is repeated sequentially from 0 (j=0) to y=a+m (j=m), which is in contact above (step S4).

The unit of the value taken by the above variable j may be set arbitrarily; for example, if the blank is small, 0
．． It is also possible to set the value in units of 1 mm, and
If the size is large, the purpose can be sufficiently achieved even if the size is 1 mm or more.

Next, the data stored in the work register xRj is sequentially collated from register xR0 to register xRm, and the largest data (blanks 5-1 with offsets come into close contact with each other at the position indicated by this data) is the register P as the array pitch Pi at this time (when the offset blank 5-1 rotates the i-th time)
The data is stored in Ri (step S5).

Next, the offset blank 5-1
The maximum value Ymax and minimum value Ymin of the above Y coordinate are determined, and the maximum value Ymax and minimum value Ymin of this Y coordinate are calculated.
and the border Sb calculated in step S1, the material width Wi is calculated, and the calculated material width Wi is stored in the register WRi (step S6).

The material width Wi is (Ymax - Y
It can be easily determined by the absolute value of min)+Futisan Sb. That is, since the offset blank 5-1 shown in FIG. 6 is the original blank 4-1 shown in FIG. 4 with an offset of 1/2 of the border Sb added (the top and bottom are Sb in total),
If Futisan Sb is further added, the same dimensional data (material width) will be obtained as when Futisan Sb is added to the top and bottom of the original blank 4-1 (see FIG. 6).

Next, the material width Wi calculated in step 6 above is read from the register WRi, and the arrangement pitch Pi calculated in the process of step S5 above is read out from the register PRi. (Amount of material used per product) is calculated. The obtained data Ai is then stored in the register ARi (step S7
).

Next, it is determined whether the angle of the blank has reached 180 degrees since the start of rotation (step 8). If the rotation has not yet been completed by 180 degrees, the process returns to step S3, the rotation process is performed again, and the processes of steps S4 to S8 are repeated.

[0040] The determination in step S8 is that the blank is
When rotated 180 degrees with respect to the arrangement direction, the rotation angle is "0".
This is when the top and bottom have just been swapped (turned upside down) from the initial state of ``'', and it is determined whether this state has been reached. In other words, even if the rotation continues to 360 degrees after this, the upper and lower sides of the state obtained by rotating from 0 to 180 degrees will only be reversed.
As a result, the data obtained by rotation from 0 to 180 degrees and the data obtained from rotation from 180 to 360 degrees are the same, so in order to end the calculation associated with rotation at rotation from 0 to 180 degrees, It is something.

[0041] If the rotation is 180, the calculations associated with the rotation (i=1 to 90) are completed. First, the contents of the register ARi (the area of material used per product) Ai are compared with the registers A1 to A90, and the minimum value Ai is set as the material data A0 that maximizes the yield. Store in register AR0. Next, Wi and Pi corresponding to the minimum value Ai (Wi×Pi) are set as the material width data W0 and pitch data P0 that maximize the yield, and are stored in registers WR0 and P0, respectively.
Further, αi at this time is stored in the register αR0 as the blank arrangement angle α0 that maximizes the yield (step S9).

[0042] As a result, the material width W at which the yield is maximized is
0, the blank arrangement pitch P0 and the arrangement angle α0 are
registers WR0, PR0, and αR0, respectively.
is required.

Next, a material drawing is created using the material width W0 determined in the register WR0. Furthermore, graphic data of the original blank 4-1 based on the blank data input in step S1 is created in the dot map memory DITTO at the angle α0 determined in the register αR0. Then, the figure of the original blank 4-1 created in the dot map memory DITTO is placed on the material drawing created above at the array pitch P0 required in the register PR0, and with edges Sb at the top and bottom. A parent diagram (blank array diagram) is created by sequentially arranging the data (see FIG. 6) (step S10).

As described above, by first inputting blank data together with material thickness data, it is possible to automatically obtain a blank arrangement diagram that maximizes the yield. In addition, in the processing in this embodiment, i registers are provided to store each data at each measurement time according to the number of measurements (number of rotations) i, but 2 registers are provided for each data. Only one register may be provided. In this case, in step S7 of FIG.
When calculating Pi, the previously calculated W(i-1)×P(i-
1) and select the smaller value as register WR (i-1).
and register PR(i-1), and the angle data corresponding to the smaller value is stored in register αR(i-1).
), and the processes of steps S3 to S8 are performed. In this way, for example, for material width, register W
It is sufficient to have two registers, Ri and WR(i-1),
At this time, the best value will always be held in register WR(i-1). Then, in step 9, instead of using the value W0 of the register WR0, the register W0 is used.
The value W(i-1) held in R(i-1) may be used immediately.

Furthermore, although the offset blank is rotated counterclockwise, it may also be rotated clockwise. Further, although the rotation angle is set every 2 degrees, the rotation angle is not limited to 2 degrees and may be set arbitrarily.

Furthermore, in the above embodiment, the CPU 21
, the keyboard 22, the display 23, and the memory 24 constitute one system configuration, but the CPU 21 and the memory 24 constitute a host computer system, and the keyboard 22 (or mouse or touch pen) and the display 23 constitute a terminal connected to the host computer system. (input/output terminal device)
may be configured.

[0047]

[Effects of the Invention] According to the present invention, it is possible to automatically create a blank array diagram that maximizes the yield, which eliminates the trouble of repeating trial-and-error simulations manually and saves time. This increases work efficiency.

Furthermore, it becomes possible to easily obtain the best data (the best blank array map).

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a system configuration diagram of one embodiment.

FIG. 3 is an operation flowchart of the CPU.

FIG. 4 is a diagram illustrating blank offset.

FIG. 5 is a diagram illustrating a method of calculating an array pitch.

FIG. 6 is a blank array diagram.

FIG. 7 is a diagram illustrating a conventional blank array diagram.

[Explanation of symbols]

1 Input means 2 Calculation means 3. Drawing means 21 CPU 22 Keyboard 23 Display α0 Blank arrangement angle W0 Raw material width P0 Blank arrangement pitch

Claims (1)

[Claims] [Claim 1] Input means for inputting blank data (
1), a calculation means (2) for calculating the blank angle at which the yield is the best for the blank data inputted by the input means (1), and a calculation means (2) for calculating the blank angle at which the yield is the best for the blank data input by the input means (1); 1. A blank arrangement diagram creation system comprising: a drawing means (3) for creating a blank arrangement diagram based on a blank arrangement pitch and a material width when the blank angle is .