KR100370701B1 - An automated process planning system for progressive working of electronic products - Google Patents

Abstract

The present invention can automatically output progressive strip layout drawings in the form of three-dimensional graphics for electrical products having bends, and the flat pattern and shape processing module generates unfolded drawings and their shapes to facilitate automation of design. By converting the data into numerical data, the internal shape, external shape, and bend line list can be automatically recognized. In addition, the processes of determining the process order in which interference does not occur with respect to the bending process and at the same time, the processes capable of performing the bending process have the effect of performing the bending process with a minimum process by working in one process.

Description

Process Design Automation System for Progressive Processing of Electrical Products {AN AUTOMATED PROCESS PLANNING SYSTEM FOR PROGRESSIVE WORKING OF ELECTRONIC PRODUCTS}

The present invention relates to a process design automation system, and more particularly to a process design automation system for the progressive processing of electrical products having bending and piercing processes.

In general, processability checks and strip layouts of products with bending processes have been largely performed by the experience and intuitive judgment of skilled technicians. However, in recent years, the necessity of computer-aided design technology has emerged due to high precision and short delivery time. Therefore, research on design automation using a computer has been reported by formalizing the experience of a skilled technician.

For example, in 1971 G. Schaffer wrote "Computer design of progressive dies," Am. Mach. Vol. 22, pp. 73-75, 1971. Proposed a computer-based progressive die design system (PDDC), after which B. Fogg and Jameson wrote "The influencing factors in optimizing press tool die layouts and a solution using computer aids, "CIRP Annals, Vol. 24, pp. 429-434, 1975. proposed a more advanced PDDC system considering various factors affecting die layout. However, such a system has the disadvantage of being semi-automatic and having a long process time.

Y. Shibata and Y. Kunimoto also describe "Sheet metal CAD / CAM system," Bull. Jpn. Soc. Prec. eng., Vol. 15. pp. 219-224, 1981. proposed a CAD / CAM system for the display of blank layouts and die layouts, S. Nakahara, T. Kojima and S. Damura ( S. Tamura, A. Funimo, S. Choichiro and T. Mukumura describe the "Computer progressive die design," Proceedings of 19th MIDR conference, pp. In 171-176, 1978, a system for progressive die layout was introduced.

In addition, JC Choi, BM Kim, HY Cho. And Chul KIM have also described "A compact and pratical CAD system for blanking or piercing of irregular-shaped sheet. metal products and stator and rotor parts, "International Journal of MACHINE TOOLS MANUFACTURE, Vol. 38, pp. 931-963, 1998. and "An integrated CAD system for the blanking of irregular-shaped sheet metal products," Journal of Materials Processing Technology, Vol. 83, pp. 84-97, 1998. developed a process and mold design automation system for the blanking and piercing process of irregular shaped sheet products.

However, the above-mentioned conventional technology has a problem that it is made semi-automatically, its processing time is long, and only two-dimensional shapes of electrical products can be recognized.

Accordingly, an object of the present invention is to provide a process design automation system and method for the progressive processing of an electrical product that automatically recognizes and displays the three-dimensional shape of the electrical product.

It is another object of the present invention to provide a process design automation system and method for the progressive processing of electrical products that perform three-dimensional bending in a strip layout with minimal processing.

1 is a schematic block diagram of a process design automation system for progressive processing of an electrical appliance according to the present invention;

Figure 2 shows the rotation of the three-dimensional coordinates.

3 is a design drawing of a product to be applied in accordance with the present invention.

3a to 3d are design drawings of products applied according to the invention.

4 shows a planar shape list and a bend list of products.

5 is a view applied to the flat pattern layout processing unit.

5A to 5H are diagrams when the drawing applied to the flat pattern layout processing section is applied to the strip layout processing section.

6A-6C are flowcharts illustrating a processing method of a system according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: three-dimensional shape processing unit 101: input unit

102: shape processing unit 103: flat pattern layout processing unit

104: workability inspection processing unit 105: strip layout processing unit

106: display unit 107: database

108: control unit 109: bending list storage unit

The object as described above is achieved according to the technical idea of the present invention, the process design automation system for the progressive processing of the electrical appliance according to the present invention, the mechanical properties of the product in accordance with the characteristic information of the electrical product input from the user A shape processing unit 102 for automatically reading and generating the product as shape data converted into a numerical list format for 3D shape recognition; A flat pattern layout processing unit (103) for receiving the shape data, generating the unfolded shape data according to the bending margin, and converting the unfolded shape data into numerical data which is easy for design automation; A machinability inspection processing unit 104 for receiving the numerical data and inspecting the machinability of the product according to the numerical data to extract moldable data; Receive the extracted data, perform a piercing process by automatically punching the division of the punch shape in the outer region of the product for progressive processing from the extracted data, and the process sequence does not occur in the bending process A strip layout processing unit 105 is provided to perform bending processing in a minimum process by allowing the processes for determining and bending processes to be performed in one process.

According to the present invention, it is possible to automatically output the progressive strip layout drawings in the form of three-dimensional graphics for electrical products having a bend, the flat pattern and the shape processing module to generate the drawings in the unfolded form, easy to automate the design The shape data can be converted into numerical data so that the internal shape, the external shape, and the bend line list can be automatically recognized. In addition, the processes of determining the process order in which interference does not occur with respect to the bending process and at the same time, the processes capable of performing the bending process have the effect of performing the bending process with a minimum process by working in one process.

Hereinafter, an embodiment according to the present invention will be described with reference to the accompanying drawings. Further objects and advantages of the present invention will be apparent from the following description, and features of the present invention will be readily understood.

1 is a schematic block diagram of a process design automation system for progressive processing of an electrical appliance according to the present invention. As shown in the figure, the system of the present invention is largely divided into a display unit 106, a three-dimensional shape processing unit 100, and a control unit 108, which will be described in more detail as follows.

First, the three-dimensional shape processing unit 100, the characteristics information of the electrical product input from the user, for example, the database 107 through the control unit 108 to control the mechanical properties of the product according to the type, thickness, width, heat treatment conditions of the material And a shape processing unit 102 for reading out the product and generating the product as shape data converted into a numerical list format for three-dimensional shape recognition.

In addition, the flat pattern layout processing unit 103 receives the shape data and supplies the shape data to the coefficient list and the bending list storage unit 109 according to the material of the material read from the database 107 via the control unit 108 for each bending line. A bending margin is calculated by extracting a stored bending radius and a bending angle, and generating unfolded shape data according to the bending margin, and converting the unfolded shape data into numerical data that is easy for design automation.

In addition, the workability inspection processing unit 104 checks the formability with the blank information obtained by the flat pattern layout processing unit 103 and extracts formable data.

In addition, the strip layout processing unit 105 receives the extracted data and performs a piercing process by automatically dividing a punch shape in an external area of the product for progressive processing from the extracted data. The bending process is performed in a minimum process by determining a process sequence in which interference does not occur, and having the processes capable of bending work in one process.

Each component of the three-dimensional shape processing unit 100 according to the present invention is performed in one environment, and since each processing unit shares a database with "rules" (described below), all processes are performed without stopping the system during execution. There is an advantage to it. In addition, the way the system proceeds is operated interactively for a variety of choices.

Hereinafter, each component of the three-dimensional shape processing unit 100 will be described in more detail.

First, the input and shape processing unit 101, 102 will be described, the input unit 101 automatically reads information about the mechanical properties of the material from the database according to the type, thickness, width, heat treatment conditions, etc. of the material input by the user. . In addition, the shape processing unit 102 converts the shape data for three-dimensional shape recognition of a product having a bending process into a numerical list format that is easy for design. The transformation thereof will be described with reference to FIG. 2. In order to recognize a three-dimensional shape product having a bending process, the relationship between the quality point on the plane rotated with respect to the bending line and the bending line should be clearly defined. For example, in FIG. 2, a point (x ₃ , y ₃ , z ₃ ) on a plane is based on a straight line, that is, a bending line passing through (x ₁ , y ₁ , z ₁ ), (x ₂ , y ₂ , z ₂ ). If we find the point (x ₆ , y ₆ , z ₆ ) rotated by θ, the space of the straight line passing through two points (x ₁ , y ₁ , z ₁ ), (x ₂ , y ₂ , z ₂ ) in space The equation is the same as Equation 1.

[Equation 1]

The equation of the plane including (x ₃ , y ₃ , z ₃ ) and perpendicular to the straight line is shown in Equation 2.

[Equation 2]

From the equations (1) and (2), the intersection points (x ₄ , y ₄ , z ₄ ) are obtained as follows.

[Equation 3]

here,

[Equation 4]

If the radius of rotation is R,

[Equation 5]

[Equation 6]

Unit vector of Say,

[Equation 7]

The equation of a straight line passing through (x ₅ , y ₅ , z ₅ ) and (x ₆ , y ₆ , z ₆ ) is

[Equation 8]

Points (x ₆ , y ₆ , z when rotated by θ with respect to straight lines passing through (x ₁ , y ₁ , z ₁ ) and (x ₂ , y ₂ , z ₂ ) from Equations 7 and 8 ₆ ) coordinates are as follows.

[Equation 9]

On the other hand, a product is defined as a combination of planes divided by bending lines, each plane consisting of an outer shape and an inner hole and slot shape. The list of product elements in the form of a straight line or a combination of arcs is in the form of (0.0 (Sp Ep) (Sp Ep) (Sp Ep) ... (Sp Ep Cp) (Sp Ep Cp) ... The list combined only with circles is generated and stored in the form of (0.0 (Cp R) (Cp R) (Cp R) ...).

Here, (Sp Ep) is a straight line, (Sp Ep Cp) is an arc, and (Cp R) is a circle. In addition, SP (xs ys zs) is a starting point, EP (xe ye ze) and Cp (xc yc zc) represent an end point, an arc and a center point in the case, and R represents a radius of a circle.

The list consisting of straight lines and arcs recreates the drawing elements in closed loops for easy design. The format is as follows:

(0.0 ((p ₁ p ₂ ) (p ₂ p ₃ p _c1 ) (p ₃ p ₄ ) ·········· (p _n-1 p _n p _cn ) (p _n p ₁ ) )

(0.0 ((q ₁ q ₂ ) (q ₂ q ₃ ) (q ₃ q ₄ q _c1 ) ·········· (q _n-1 q _n q _cn ) (q _n q ₁ ) )

Here, in (p _n-1 p _n p _cn ) (p _n p ₁ ), p _n is the end point of (p _n-1 p _n p _cn ) and the starting point of (p _n p ₁ ) and p _cn is an arc Is the center point. Also, in p ₁ (x ₁ y ₁ z ₁ ), x ₁ has the minimum x coordinate value in the closed loop of p type, and based on this p ₁ , the closed loop of p type circulates clockwise.

The outer shape and the inner shape each configured in the closed loop unit constitute one flat list, and the list of the product is formed in the following format by the combination of the flat list.

(("p1" (external shape internal shape (1) internal shape (2) ... internal shape (n))

(("p2" (external shape internal shape (1) internal shape (2) ... internal shape (n))

........................................ ........

(("pn" (external shape internal shape (1) internal shape (2) ... internal shape (n))

In addition, a product with a bending process must define the information about the bending and the interrelationships with the planes interconnected with the bending lines. The information on the bending is composed of entity information of the bending line, the bending angle, the bending radius, and the bending movement information. The information on the plane is composed of the fixed reference plane and the rotation plane as follows.

(("B1" (Bending Line Information) Bend Angle Bending Radius Bending Movement Information Reference Plane Rotation Plane)

(("B2" (Bending Line Information) Bend Angle Bending Radius Bending Movement Information Reference Plane Rotation Plane)

........................................ ...............

(("Bn" (Bending Line Information) Bending Angle Bending Radius Bending Movement Information Reference Plane Rotation Plane)

Subsequently, the flat pattern layout processing unit 103 will be described. The flat pattern layout processing unit 103 calculates the bending radius and the bending angle which are stored in the bending list and the coefficient according to the material of the material read from the database for each bending line. Extract and calculate the bending allowance. In addition, it unfolds one by one in the reverse order of the bend lines stored in the bend list. At this time, the planes associated with the bends are automatically searched to rotate each material point of the plane, and then the calculated bend allowances are moved again. By repeating this process, the graphic is printed on the screen. In other words, the language of Auto LISP can automatically draw the shape of the product to be made on Auto CAD, so the system of the present invention is applied to a product having a bending and piercing process. Auto LISP is programmed to convert shape data into numerical data for easy design. With these numerical data, the flat pattern layout module extracts the coefficients according to the material of the material read from the database and the bending radius and the bending angle stored in the bending list for each bending line, and then L = a + b + θ (r Calculate the bending free flow rate by the formula + λt). The plane associated with the bend is automatically searched in the reverse order of the bend lines stored in the bend list to rotate each point of the plane and move it by the calculated bend margin. By repeating this process, the unfolded drawings are output on the screen in graphic form.

Next, the processability inspection processing unit 104 will be described, the processability processing unit serves to check the formability with the information of the blank obtained from the flat pattern layout processing unit, and when forming the blank contour by blanking or piercing, the processable geometry Present the area. Factors considered in the processability check are:

① minimum bending radius

The minimum bend radius is the smallest allowed radius that can be bent without cracks and tears along the bend line. This minimum bending radius is affected by material, thickness and heat treatment conditions.

② High stress area and corner / fillet radius

High stresses usually occur at the ends of the bend and material breakage such as tearing and cracking is easily propagated in these areas. Simple geometric inference capable of finding bends with high stress regions and corners that require deformation to perform a successful bend is performed.

③ distance between bend line and internal contour

The minimum distance between the hole and the bend line should be maintained to prevent torsion during bending.

④ the distance between two internal features to be blanked or pierced

⑤ Minimum hole to be pierced

Next, the strip layout processing unit 105 will be described. According to the results obtained by the above processing units, the strip layout processing unit 105 performs the piercing processing by automatically dividing the punch shape in the outer region of the product for the progressive processing. The process order is determined so that interference does not occur with bending, and at the same time, processes that can bend are performed in one process, and a process design drawing of a three-dimensional shape is automatically generated.

Meanwhile, the applicant of the present invention extracts the expertise of each component of the three-dimensional shape processing unit 100 for the constrained bending product from the plastic mechanics theory, the accumulated research results, and the empirical knowledge of field experts. Rules and databases have been established for these issues, where rules are quantified by systematically organizing process design rules derived from plastic theory, accumulated research results, and empirical knowledge of field experts. Use a construction rule of the form IF [conditions] THEN [action] ". The information of the result section is calculated according to the information of the condition section, and the output information of the result section becomes the input information of the next condition section.

Next, we have a process design rule and quantify it and use a decision-based generation rule to calculate the weighted fuzzy values representing the importance of each rule for the bending process, and then we start the bending process from the bending with the highest fuzzy value. It is a process to perform. Process design rule for determining bending order 1) Distance rule The method of calculating the distance between the mother plane and the distance is calculated by calculating the number of planes placed between the bend and the mother plane. When the largest number is calculated by calculating the number of planes placed between each bend and the mother plane, the fuzzy value is 1 and the remaining number of purge values is proportionally smaller. The fuzzy value of the bend attached to the mother plane is zero. The bending process is performed first from the distance from the mother plane. 2) Single plane rule "Single plane" refers to the case where there is only one bend in the plane. Since the bending in a single plane does not cause problems for other bending processes, it is first performed. 3) Angle The angle of bending of the regular bending process, ie between the mother plane and the children plane. When the bending angle of is 90 degrees or more, this bending process is carried out in one or more steps. The bending process with a bending angle of less than 90 ° is performed before the bending process with more than 90 ° .In this rule, the purge value is 1 for bending angles above 90 ° and the purge value is 0 for bending angles below 90 °. When the bend lines are parallel during the bending process in the same direction in the mother plane, the smaller the bending angle of each bending process is, the smaller the bending angle relative to the mother plane is, the more likely the bending process can be performed simultaneously. The relative bending angle with the mother plane was set to 0 when the angle was between 0 ° and 9 °. 5) In the simultaneous machining regular bending process, the bending processes with the same direction vector of the bend line can be used for the set-up direction of the progressive mold. Since the same, the machining can be performed at the same time when the interference of the mold does not occur. A bending process with two or more unit direction vectors of the same bending line has a purge value of 1 and a purge value of 0 if none. 6) In a feeding rule progressive mold, a bending process is performed to perform a product after the bending process is performed. Depending on the direction, an escape area is required on the upper stripper plate or the lower die plate. Such an evacuation site should minimize the area of the evacuation site in consideration of the reduction of the mold strength, the increase in the processing cost, and the reduction of the portion for fixing the material. In order to minimize the area of the escape site, a bending process requiring a large area of the escape site must be performed later. Therefore, the bending perpendicular to the feeding direction is smaller than the bending coincidence with the feeding direction, so the bending process perpendicular to the feeding direction is performed before the bending process coinciding with the feeding direction. The weighted fuzzy value calculation FVM, which indicates the importance of each rule, is a matrix that calculates the fuzzy value of each bend to determine the order of the bending process. The order of process design rules for determining the order of bending processes is as follows: 1) distance rule of mother plane, 2) single plane rule, 3) angle rule, 4) parallel rule, 5) simultaneous machining rule, 6) feeding rule. Looking at the rules of the layout of the flat pattern layout processing unit 103,

Rule 1) The flat pattern layout of the bent product is divided into straight and bent parts and only the bent parts are calculated separately.

Rule 2) The development length of the flat pattern layout is determined by Equation 10 below.

[Equation 10]

Here, A _i is the length of the straight portion, x is the length of the bend, θ is the bending angle, r is the bending radius, t is the bending thickness, and λ is obtained from the database.

Rule 3) As the r / t is smaller, the neutral axis moves inward, and if r / t is 5 or more, the neutral axis is the center of the product thickness.

Rule 4) The length of the bend at V bend when r / t is 0.2 or less shall be x = 0.5t.

Rule 5) The length of the bend in U-bending when r / t is 0.2 or less shall be x = (0.45 to 0.5) t.

Rule 6) The bend line is located at the midpoint of the bend arc on the neutral axis.

If we go on and review the machinability rules,

Rule 1) The clearance between product shapes and the clearance between the product's top and bottom edges are determined from the database according to the thickness of the material.

Rule 2) The minimum distance between internal shapes shall be greater than the value suggested by the database.

Rule 3) If the shape of the piercing hole is rectangular or circular, the processing limit dimension of the piercing shall satisfy the requirements of the database depending on the shape, thickness and physical properties.

Rule 4) For materials not existing in the database, the diameter or slit width shall be greater than the thickness (1t).

Rule 5) Corner and fillet radius of the product should be greater than 0.5t.

Rule 6) The minimum distance between the bend line and the inner shape shall satisfy the condition r <g (g is the minimum distance between the bend line and the inner shape, r is the bending radius).

Next, look at the strip layout rules.

Rule 1) Bending in the feeding direction is performed at the same time as possible.

Rule 2) Bending in the vertical direction in the feeding direction is performed so that interference does not occur.

Rule 3) In the progressive die, the bending in the horizontal direction is followed by the vertical bending process in the feeding direction.

Rule 6) If punch mounting is possible when internal shapes are related to each other, it is processed in the first process.

Rule 7) Arrange the first die blank on the leftmost side of the listed pitches and move to the second pitch if overlapped when the second die blank is placed on the pitch where the first die blank is placed, according to the process sequence. After this method is performed continuously, the strip layout process is completed.

Rule 8) The surface pressure acting on the die side is determined by Equation 11 below.

[Equation 11]

Where BRL is the burnish length ratio to the material thickness (mm), F _d is the lateral force, t is the material thickness, and L _shear is the sum of the shear lengths.

Rule 9) The die outer diameter that can withstand the surface pressure acting on the die side is determined by Equation 12 below.

[Equation 12]

Where m is 1 ≦ m ≦ 1.155, δ _y is the yield strength of the die, and d _i is the die inner diameter.

Rule 10) If the fracture surface of the cut surface is bent to the outside, cracks are likely to occur, so the shear surface of the cut surface is set on the outside.

Rule 11) V free bending work force is determined by the following equation (13).

[Equation 13]

Here, P ₁ is the bending work force, C ₁ is the correction coefficient, B is the bending line length, t is the plate thickness, δ _b is the tensile strength of the material.

Hereinafter, look at the performance results applied to the process design automation system developed for the electrical products having the above bending process.

First, FIG. 3 is a design diagram of a product to be applied to an input and shape processing unit according to the present invention. That is, the user inputs the type of material, heat treatment condition, and thickness of the product having the bending process as shown in FIG. 3A, and then inputs shape data for each plane. At this time, the system is configured to input on the X-Y plane for the user's convenience. After the shape data of one plane is automatically recognized, a bending line is selected as shown in FIG. 3B, and a bending angle, a bending radius, and movement information of the bending line corresponding to the selected bending line are input. Once information about the bend is entered, the screen is cleared so that the next plane can be entered, and only the bend line is redrawn. When the second plane is input as shown in FIG. 3C, the system is automatically recognized so that the user can know the shape of the product after bending on the screen as shown in FIG. 3D. 4 shows a shape list and a bend list of products automatically recognized through this process.

5 is a diagram applied to the flat pattern layout processing unit. That is, the bending coefficient and bending obtained from the database according to the material of the material in the reverse order of the bends stored in the bend list in the flat pattern layout processing unit using the shape list and the bend list of the plane automatically recognized by the input and shape processing unit. After calculating the bending allowance by extracting the bending radius and the bending angle stored in the list, the plane associated with the bending is automatically searched, and each material point on the corresponding plane is rotated, and the calculated bending allowance is moved again. . This process was repeated to output the drawing in the unfolded form as shown in FIG. 5 on the screen in graphic form. Here, the hatching part shows the bending allowance.

On the other hand, when applying the flat pattern layout drawing as shown in FIG. 3 through the workability inspection processing unit 104, the minimum machined internal shape distance between the line and the line, the line and the arc, the line and the circle, and the minimum distance between the bend line and the internal shape are It was found that it is machined by comparing the corner radius of the product and the internal values to be pierced and the limits stored in the database.

Subsequently, when the flat pattern layout diagram shown in FIG. 5 is applied to the strip layout processing unit 105, the results performed by the processing unit are shown in FIGS. 5A to 5H. Specifically, when the flat-pattern layout is transmitted as shown in FIG. 5A, external piercing, that is, notching, is performed before the bending by strip layout rule 4). The shape of the notching punch is determined through the interactive conversation with the user according to the outer shape of the product, and it checks the presence or absence of interference with the determined die blank shape and performs it in one process if the interference does not occur. Until not, it was divided into several processes. In FIG. 5B, a pilot pin hole was pierced so that the position between the shapes of the product was accurate, and side cutting was performed to cut the width of the material. Next, a notching process related to the bending process of FIG. 5C was performed to perform the bending process of FIG. 5C. The bending process was first performed in the feeding direction in accordance with the strip layout rule 3) as shown in FIG. 5C. Since no interference occurred between the punch and the die during the bending process, the bending process was simultaneously performed by strip layout rule 1). In addition, in Fig. 5d, the rectangular shape inside the product was pierced, and then a notching process for vertical bending in the feeding direction was performed. According to the strip layout rule 2), the bending in the feeding direction is first performed in the middle of the bending process as shown in FIG. 5E so that interference does not occur, and the bending is located near the fixed plane as in FIG. By performing the bending process located in the far position on the fixed plane as shown in Figure 5g, by performing the cutting process as shown in Figure 5h it was possible to obtain a desired electrical product.

So far, the results of the processing according to the system of the present invention have been described with reference to the drawings. From now on, the operation of the present invention is outlined through a flowchart sequentially showing the processing method of the system according to the present invention with reference to Figs. 6A to 6C. Explain.

First, in step 110 the user inputs the characteristic information of the electrical product, for example, the material of the product, the heat treatment conditions of the product, the thickness of the material and the width dimensions of the material. In step 111, the mechanical properties of the product according to the input product characteristic information are automatically extracted from the database. In step 112 the user enters the planar shape of the product. The plane shape of the input product is recognized and a shape and a bend list (shown in FIG. 4) as described in detail above are generated (step 113). In step 114, the existence of bending is checked. If bending is present, bending line selection, bending angle input, bending radius input and bending movement information input are performed. Step 116 generates a product drawing according to the input information, and in step 117 generates a connection list between bends and planes in the case of product drawings with bends.

In steps 118 to 121, the plane associated with the bending is automatically searched for, and each quality point of the plane is rotated and then moved by the calculated amount of bending allowance. Subsequently, a flat pattern layout drawing is generated in step 122, and in step 123 to 127, processability of the product is examined from the generated flat pattern layout drawing to extract moldable data. That is, it is determined whether the minimum bending radius, the minimum corner and fillet radius, the minimum distance between the bending line and the inner shape, the minimum distance between the inner shape, the minimum slot and the diameter of the hole, etc. are smaller than the preset limit value. If no, it is fed back to step 112, which is the step of inputting the planar shape of the product.

Subsequently, in step 128, the piercing process sequence of the outer region is determined by the interference test of the mold from the extracted data. In step 129, a die blank of each shape is designed, and in step 130, interference between the die blanks is checked. If there is interference between the die blanks, process separation is performed in step 131, and if there is no interference, it is checked whether there is a vertical bending in the feeding direction (step 132). If there is no vertical bending in the feeding direction, the process proceeds to the next step. In step 133, if there is a vertical bending, the interference check between the vertical bendings in the feeding direction is checked. Bending is performed (step 134), and if there is an interference check, vertical bending in the feeding direction is performed in various processes (step 135).

Subsequently, in step 136 again checks for the presence of bending in the feeding direction, generates a strip layout drawing if no bending exists (step 140), and checks for interference checks between bending in the feeding direction if bending is present. If there is no bending in the feeding direction in one process (step 138), and bending in the feeding direction in several processes if there is an interference check (step 139), the process generates a strip layout drawing in step 140 This ends.

As described above, according to the preferred embodiment of the present invention, the progressive strip layout drawing can be automatically output in the form of a three-dimensional graphic for the electric product having the first bend. Second, in the flat pattern and shape processing module, an unfolded drawing may be generated, and the shape data may be converted into numerical data to facilitate the design automation, thereby automatically recognizing the internal shape, the external shape, and the bent line list. Third, the process sequence that does not cause interference with the bending process, and at the same time the processes that can be bent at the same time has the effect of performing the bending process to a minimum process by working in one process.

Claims (2)

A shape processor 102 which automatically reads the mechanical properties of the product according to the characteristic information of the electric product input from the user and generates the product as shape data converted into a numerical list format for 3D shape recognition; A flat pattern layout processing unit (103) for receiving the shape data, generating the unfolded shape data according to the bending margin, and converting the unfolded shape data into numerical data which is easy for design automation; A machinability inspection processing unit 104 for receiving the numerical data and inspecting the machinability of the product according to the numerical data to extract moldable data; Receive the extracted data, perform a piercing process by automatically punching the division of the punch shape in the outer region of the product for progressive processing from the extracted data, and the process sequence does not occur in the bending process Process design automation system for the progressive processing of electrical products, characterized in that it comprises a strip layout processing unit 105 to perform the bending process in a minimum process by determining, and the processes that can be bent in one process . In the process design automation method for the progressive processing of electrical products, A user inputting characteristic information of the electrical product; Automatically extracting mechanical properties of the product according to the input product characteristic information; A user inputting a planar shape of the product; Recognizing the planar shape of the article and generating a shape and a bend list; Checking whether a bend is present and performing bending line selection, bending angle input, bending radius input and bending movement information input if bending is present; Generating a product drawing; Generating a linked list between bends and planes in the bent product drawings; Automatically searching for a plane associated with the bend to rotate each material point of the plane and to move the calculated amount of bending allowance again; Generating a flat pattern layout drawing; Extracting moldable data by inspecting a workability of the product from the generated flat pattern layout drawing; Determining an order of a piercing process of an external region through interference detection of a mold from the extracted data; A diblank design step of each shape; Checking the interference between the di blanks and performing process separation until no interference occurs; Check the existence of vertical bending in the feeding direction, and if there is a vertical bending, check the interference check between the vertical bending in the feeding direction, and if there is no interference check, perform the vertical bending in the feeding direction in one process, and When the vertical bending in the feeding direction in a number of processes; If there is no vertical bending in the feeding direction, check for the presence of feeding direction bending again, generate a strip layout drawing if no bending exists, and check for interference checks between bending in the feeding direction if bending is present. To perform bending in the feeding direction in one process when there is no interference check, and to generate the strip layout drawing by performing bending in the feeding direction in various processes when there is an interference check. To automate process design for progressive machining of workpieces.