A Design Method for Scrap Slide Discharge of Sheet Metal Dies

Abstract

The present invention provides a design method for discharging scrap chutes of sheet metal dies. The method includes: inputting process digital models to obtain all scrap sheet bodies of the sheet metal die; obtaining the spatial positions and machine types of the scrap sheet bodies, presetting reference scrap chutes with different discharge orientations for each scrap sheet body according to the machine type, and determining whether each scrap sheet body can be discharged along its preset reference scrap chute; obtaining the reference scrap chutes along which each scrap sheet body can smoothly slide out, and selecting the scrap chute with the shortest distance for each scrap sheet body from them as the tentative scrap chute corresponding to the scrap sheet body; presetting a merging rule, and merging the tentative scrap chutes according to the preset merging rule to determine and output the final scrap chute. This method is applicable to the design of scrap discharge in different scenarios. At the same time, the selection and merging of scrap chutes can be carried out according to the corresponding scenarios, which not only reduces the material cost, but also improves the quality and efficiency of the design of scrap in sheet metal dies.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal molds, and particularly relates to a design method for discharging waste material chutes of sheet metal molds. Background Art

[0002] With the continuous development of the home appliance and 3C industries, the product structure has become increasingly complex and the replacement speed is fast, which puts forward high requirements for the update speed of the product structure. Designing waste material discharge for sheet metal molds is a difficult problem in the industry. Currently, the waste material design in the industry mainly relies on the design experience of engineers. Especially during the waste material discharge process, in order not to affect the normal production rhythm, it is necessary to analyze the falling process of the waste material to prevent material jamming and affect production.

[0003] Disclosure No. CN117910147B discloses a design method, device, electronic device and storage medium for waste material discharge structure. The method includes: obtaining the process design drawing of an automotive panel, identifying the trimming line and punching line from the process design drawing, generating a trimming line slide plate structure according to the position where the trimming line is located and in combination with a preset trimming slide chute inclination angle, generating a punching line slide plate structure according to the maximum contour envelope corresponding to the punching line and in combination with a preset punching slide chute inclination angle, and generating a waste material discharge structure for the automotive panel based on the trimming line slide plate structure and the punching line slide plate structure. By the position of the trimming line and the maximum contour envelope of the punching line, in combination with the preset trimming slide chute inclination angle and the preset punching slide chute inclination angle, generating the trimming line slide plate structure and the punching line slide plate structure to generate the waste material discharge structure.

[0004] The waste material chute in the above solution is generated by identifying the process line. This method considers fewer factors for waste material discharge, cannot be applied to waste material discharge design in different scenarios, and at the same time, cannot merge waste material chutes according to the corresponding scenarios, increasing the material cost, thereby reducing the quality and efficiency of sheet metal mold waste material design. Summary of the Invention

[0005] In view of this, the present invention proposes a design method for discharging waste material chutes of sheet metal molds, which is applicable to waste material discharge design in different scenarios. At the same time, the waste material chutes can be selected and merged according to the corresponding scenarios, not only reducing the material cost, but also improving the quality and efficiency of sheet metal mold waste material design.

[0006] The present invention provides a design method for discharging waste material chutes of sheet metal molds, and the method includes:

[0007] S1, inputting process digital models to obtain all waste material sheets of the sheet metal mold;

[0008] S2. Obtain the spatial positions and machine types of each waste sheet, preset reference waste chutes with different discharge orientations for each waste sheet according to the machine type, and determine whether each waste sheet can be discharged along its preset reference waste chute;

[0009] S3. Obtain the reference waste chutes through which each waste sheet can smoothly slide out, and select the waste chute with the shortest distance for each waste sheet from them as the tentative waste chute corresponding to the waste sheet;

[0010] S4. Preset a merging rule, and merge the tentative waste chutes according to the preset merging rule to determine the final output waste chute.

[0011] Based on the above technical solutions, preferably, in step S1, input the process digital model to obtain all waste sheets of the sheet metal die. Among them, input the process digital model, calculate the area of each sheet in the process digital model respectively, sort all the sheets according to the size of the area, obtain all the sheets except the one with the largest area, and encode them in sequence. All the encoded sheets are waste sheets.

[0012] Based on the above technical solutions, preferably, in step S2, preset reference waste chutes with different discharge orientations for each waste sheet according to the machine type, where

[0013] the machine types include those with waste discharge holes in the middle of the machine and those without waste discharge holes in the middle of the machine;

[0014] If the machine type is one without waste discharge holes in the middle of the machine, then preset reference waste chutes for each waste sheet to be discharged along the X-axis direction or the Y-axis direction to the edge of the machine;

[0015] If the machine type is one with waste discharge holes in the middle of the machine, then preset reference waste chutes for each waste sheet to be discharged along the X-axis direction or the Y-axis direction to the edge of the machine and reference waste chutes for each waste sheet to be discharged along the X-axis direction or the Y-axis direction to the adjacent machine waste holes.

[0016] Based on the above technical solutions, preferably, in step S2, determine whether each waste sheet can be discharged along its preset reference waste chute, which includes the following sub-steps:

[0017] Obtain the spatial positions of each waste sheet and calculate the inclined plane angles of the corresponding preset reference waste chutes;

[0018] Perform a force calculation on the waste sheets corresponding to each reference waste chute to obtain the sliding acceleration of each waste sheet on each corresponding reference waste chute. The expression is:

[0019]

[0020] Wherein, n is the waste sheet body with the nth serial number obtained, i is the discharge direction of the ith preset reference waste chute in the waste sheet body with the nth serial number, is the sliding acceleration of the ith preset reference waste chute in the waste sheet body with the nth serial number, is the friction coefficient between the waste sheet body with the nth serial number and the corresponding ith preset reference waste chute, and g is the acceleration due to gravity, is the inclined plane angle of the ith preset reference waste chute in the waste sheet body with the nth serial number;

[0021] Judge whether the sliding acceleration of each waste sheet body on each corresponding reference waste chute is greater than 0. If then the waste sheet body can be discharged along its corresponding reference waste chute.

[0022] Based on the above technical solutions, preferably, obtaining the positions of each waste sheet body and calculating the inclined plane angles of each corresponding preset reference waste chute, including the following sub-steps:

[0023] Obtain the spatial positions of each waste sheet body in sequence. The spatial position of the waste sheet body is the three-dimensional coordinates of its center point;

[0024] If the type of the machine tool is such that there is no waste discharge hole in the middle of the machine tool, project the position of the waste sheet body onto the surface of the lower die holder along the stamping vertical direction to obtain the first projection position; project the position of the waste sheet body onto the surface of the machine tool along the stamping vertical direction to obtain the second projection position, and calculate the straight-line distance between the first projection position and the second projection position;

[0025] Obtain the straight-line distance between the second projection position and the edge of the machine tool; calculate the inclined plane angles of each reference waste chute based on the straight-line distance between the first projection position and the second projection position and the straight-line distance between the second projection position and the edge of the machine tool;

[0026] If the type of the machine tool is such that there is a waste discharge hole in the middle of the machine tool, project the position of the waste sheet body onto the surface of the lower die holder along the stamping vertical direction to obtain the first projection position; project the position of the waste sheet body onto the surface of the machine tool along the stamping vertical direction to obtain the second projection position, and calculate the straight-line distance between the first projection position and the second projection position;

[0027] Judge the discharge direction of each reference waste chute. If the discharge direction is to be discharged to the edge of the machine tool along the X-axis direction or the Y-axis direction, then obtain the straight-line distance between the second projection position and the edge of the machine tool; calculate the inclined plane angles of each reference waste chute based on the straight-line distance between the first projection position and the second projection position and the straight-line distance between the second projection position and the edge of the machine tool;

[0028] When discharging along the direction of the waste material pointing to the waste hole of the machine, the distance between the second projection position and the edge of the adjacent material discharge hole of the machine is obtained; and based on the distance between the first projection position and the second projection position of the waste sheet body and the distance between the second projection position and the edge of the material discharge hole of the machine along the waste chute, the inclined plane angle of the waste chute is calculated.

[0029] Based on the above technical solutions, preferably, in step S3, the reference waste chutes corresponding to each waste sheet body that can slide out smoothly are obtained, and the waste chute with the shortest distance for each waste sheet body is selected as the tentative waste chute corresponding to the waste sheet body, which includes the following sub-steps:

[0030] Construct a first temporary set, obtain the reference waste chutes corresponding to each waste sheet body when the sliding acceleration on each corresponding reference waste chute is greater than 0, and add them to each temporary subset according to the classification of the waste sheet bodies;

[0031] Judge the number J of reference waste chutes added to each temporary subset n , if J n <0, then output that the waste sheet body with the corresponding number cannot be discharged smoothly; if J n =1, then determine that this reference waste chute is the tentative waste chute of the waste sheet body with the corresponding number; if J n >1, then obtain the length distances of each reference waste chute in each temporary subset and sort them, and select the reference waste chute with the shortest distance as the tentative waste chute of the waste sheet body with the corresponding number.

[0032] Based on the above technical solutions, preferably, after step S3, it further includes obtaining the sizes of each waste sheet body and calculating the chute width of the tentative waste chute according to the sizes of the waste sheet bodies, which includes the following sub-steps:

[0033] S431, sequentially obtain the sizes of each waste sheet body, and construct a first inclusion body along the boundary of the waste sheet. The first inclusion body is circular, and the diameter of the first inclusion body is the distance between the two farthest ends of the waste sheet body;

[0034] S432, calculate the chute width of the tentative waste chute of the waste sheet body according to the diameter of the first inclusion body, and the expression is:

[0035] W n =D n +2C;

[0036] In the formula, W n is the chute width of the tentative waste chute corresponding to the waste sheet body with the nth number, D n is the diameter of the first inclusion body corresponding to the waste sheet body with the nth number, and C is the safety distance.

[0037] Based on the above technical solutions, preferably, for the preset merging rule in step S4, the tentative waste chutes are merged according to the preset merging rule to determine the final output waste chute, which includes the following sub-steps:

[0038] According to the spatial positions of the waste sheets, the distances between each waste sheet and other waste sheets are obtained in sequence, and the minimum value of the distances between each waste sheet and other waste sheets is selected as the shortest distance between adjacent waste sheets;

[0039] A preset waste chute merging threshold is set. By comparing the shortest distance between adjacent waste sheets with the preset waste chute merging threshold, the two adjacent waste sheets corresponding to the shortest distance between adjacent waste sheets that is less than the preset waste chute merging threshold are obtained;

[0040] Judge whether the discharge directions of the tentative waste chutes of the two corresponding adjacent waste sheets are the same. If the discharge directions are the same, the tentative waste chutes of the two adjacent waste sheets are merged. If the discharge directions are different, they are not merged, and the final waste chute is determined and output.

[0041] Based on the above technical solutions, preferably, for the judgment of whether the discharge directions of the tentative waste chutes of the two corresponding adjacent waste sheets are the same, if the discharge directions are the same, the tentative waste chutes of the two adjacent waste sheets are merged. If the discharge directions are different, they are not merged, and the final waste chute is determined and output, which includes the following sub-steps:

[0042] Judge the positional relationship of the two adjacent waste sheets in the X-axis direction, Y-axis direction and discharge direction;

[0043] If the positions of the two adjacent waste sheets are on the same straight line in the X-axis direction or Y-axis direction, and the straight line extension direction is the same as the discharge direction of the tentative waste chute, then select the longer tentative waste chute as the merged waste chute;

[0044] If the positions of the two adjacent waste sheets are on the same straight line in the X-axis direction or Y-axis direction, and are different from the discharge direction of the tentative waste chute, then delete any one of the tentative waste chutes, and widen the chute of the other tentative waste chute towards the other waste sheet;

[0045] If the positions of the two adjacent waste sheets are not on the same straight line and coincide in the X-axis direction or Y-axis direction, then delete the shorter tentative waste chute, retain the longer tentative waste chute, and widen the chute towards the other waste sheet;

[0046] According to the merged waste chute, recalculate the sliding acceleration of the two adjacent waste sheets on the merged waste chute. If the sliding acceleration is greater than 0, retain and output the merged waste chute; otherwise, do not perform the merging.

[0047] Based on the above technical solution, preferably, widening the chute includes obtaining the first enclosing body of two adjacent waste sheets; constructing a second enclosing body tangent to the edge according to the first enclosing body of the two adjacent waste sheets. The first enclosing bodies of the two adjacent waste sheets are both externally tangent to the second enclosing body. Obtain the diameter of the second enclosing body, and calculate the width of the tentative waste chute after widening according to the diameter of the second enclosing body.

[0048] A design method for discharging the waste chute of a sheet metal mold provided by the present invention has the following beneficial effects compared with the prior art:

[0049] (1) By inputting the process digital model, all waste sheets in the sheet metal mold are automatically identified. According to the spatial position and machine type of each waste sheet, reference waste chutes with different discharge orientations are preset, greatly improving the design efficiency, reducing manual intervention and calculation time, and determining whether the chute is suitable for the smooth discharge of waste. Subsequently, the reference chutes that can smoothly slide out the waste are screened out, and the one with the shortest distance is selected as the tentative waste chute for each waste sheet; finally, according to the preset merging rules, the tentative waste chutes are merged to form the final waste chute layout. By optimizing the selection and merging of waste chutes, it is ensured that the waste can be smoothly discharged along the shortest path, reducing production costs and unnecessary material consumption. At the same time, this method also has high flexibility and can adapt to different types of sheet metal molds and machines, thereby improving the quality and efficiency of the waste design of sheet metal molds;

[0050] (2) Through the calculation of the inclined plane angle of the preset reference waste chute and the force analysis of the waste sheet sliding on the reference chute, it can be more accurately determined whether the waste sheet can be discharged along the preset reference waste chute, thereby improving the accuracy of the design;

[0051] (3) By optimizing the layout of the waste chute according to the spatial position of the waste sheets, the distance between them, and the discharge orientation of the waste chute, the efficiency and effect of waste treatment are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0053] Figure 1 It is a schematic flow chart of the present invention;

[0054] Figure 2 It is a process digital model flow chart of the sheet metal mold of the present invention;

[0055] Figure 3 It is a schematic diagram of the waste discharge hole existing in the machine of the present invention;

[0056] Figure 4 It is a schematic diagram of the waste discharge hole not existing in the machine of the present invention;

[0057] Figure 5 It is a top view of waste discharge along the X-axis or Y-axis of the present invention;

[0058] Figure 6 It is a top view of waste discharge along the waste discharge hole of the machine of the present invention;

[0059] Figure 7 It is a side view of material discharge along the edge of the press of the present invention;

[0060] Figure 8 It is a side view of waste discharge along the waste discharge hole of the machine of the present invention;

[0061] Figure 9 It is a schematic diagram of the tentative waste chute width of the present invention;

[0062] Figure 10 It is a schematic diagram of the waste sheet on the sheet metal mold of the present invention;

[0063] Figure 11 It is a schematic diagram of the shortest distance between adjacent waste sheets on the waste sheet of the sheet metal mold of the present invention;

[0064] Figure 12 It is a schematic diagram of the first scenario of the tentative waste chute before merging of the present invention;

[0065] Figure 13 It is a schematic diagram of the first scenario of the tentative waste chute after merging of the present invention;

[0066] Figure 14 It is a schematic diagram of the third scenario of the tentative waste chute before merging of the present invention;

[0067] Figure 15 It is a schematic diagram of the third scenario of the tentative waste chute before merging of the present invention;

[0068] Figure 16 It is a schematic diagram of the second scenario of the tentative waste chute before merging of the present invention;

[0069] Figure 17 It is a schematic diagram of the second scenario of the tentative waste chute before merging of the present invention;

[0070] Figure 18 Schematic diagram of the width of the combined waste chute for the present invention Detailed implementation mode

[0071] Next, in combination with the implementation mode of the present invention, the technical solutions in the implementation mode of the present invention will be clearly and completely described. Obviously, the described implementation mode is only a part of the implementation modes of the present invention, rather than all the implementation modes. Based on the implementation modes in the present invention, all other implementation modes obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention

[0072] As Figure 1 shown, the present invention provides a design method for discharging the waste chute of a sheet metal mold, and the method includes:

[0073] S1. Input the process digital model and obtain all waste sheet bodies of the sheet metal mold

[0074] As Figure 2 shown, in step S1, input the process digital model and obtain all waste sheet bodies of the sheet metal mold. Among them, input the process digital model, calculate the area of each sheet body in the process digital model respectively, sort all the sheet bodies according to the size of the area, obtain all the sheet bodies except the one with the largest area, and encode them in sequence. All the encoded sheet bodies are waste sheet bodies

[0075] It should be noted that the user inputs the process digital model containing the detailed information of the sheet metal mold into the design system. This digital model usually includes information such as the geometric shape, size, material of the mold, and the position and shape of all sheet bodies formed during the stamping process. After receiving the process digital model, the design system will automatically identify and extract all the sheet bodies in the digital model. For each sheet body, the system will calculate its area. The design system sorts all the sheet bodies according to the size of the area to ensure that the largest sheet body is ranked in the front. After the sorting is completed, the system obtains all the sheet bodies except the one with the largest area. These screened sheet bodies will be regarded as waste sheet bodies for subsequent processing. For the convenience of management and subsequent design work, the system will encode the screened waste sheet bodies in sequence. Each waste sheet body will be assigned a unique code for easy tracking and reference

[0076] S2. Obtain the spatial positions and machine types of each waste sheet body, preset reference waste chutes with different discharge orientations for each waste sheet body according to the machine type, and judge whether each waste sheet body can be discharged along its preset reference waste chute

[0077] As Figures 3 - 6As shown, in step S2, the machine types include those with a waste discharge hole in the middle of the machine and those without a waste discharge hole in the middle of the machine. When the machine type is one without a waste discharge hole in the middle of the machine, the reference waste chutes for discharging each waste sheet body to the edge of the machine along the X-axis direction or the Y-axis direction are preset. When the machine type is one with a waste discharge hole in the middle of the machine, the reference waste chutes for discharging each waste sheet body to the edge of the machine along the X-axis direction or the Y-axis direction and the reference waste chutes for discharging each waste sheet body to the adjacent machine waste hole along the X-axis direction or the Y-axis direction are preset.

[0078] It should be noted that by presetting the reference waste chutes according to the machine type, the system can preset multiple candidate chutes with different orientations, enabling the system to have sufficient flexibility to adapt to different changes and improving the applicability.

[0079] In step S2, the judgment of whether each waste sheet body can be discharged along its preset reference waste chute includes the following sub-steps:

[0080] Obtain the spatial positions of each waste sheet body and calculate the inclined plane angles of the corresponding preset reference waste chutes.

[0081] Perform a force calculation on the waste sheet bodies corresponding to each reference waste chute to obtain the sliding acceleration of each waste sheet body on each corresponding reference waste chute. The expression is:

[0082]

[0083] In the formula, n is the waste sheet body with the nth number obtained, i is the discharge orientation of the ith preset reference waste chute in the waste sheet body with the nth number, is the sliding acceleration of the ith preset reference waste chute in the waste sheet body with the nth number, is the friction coefficient between the waste sheet body with the nth number and the corresponding preset ith reference waste chute, g is the acceleration due to gravity, is the inclined plane angle of the ith preset reference waste chute in the waste sheet body with the nth number;

[0084] Judge whether the sliding acceleration of each waste sheet body on each corresponding reference waste chute is greater than 0. If then the waste sheet body can be discharged along its corresponding reference waste chute.

[0085] It should be noted that by presetting a suitable waste chute according to the spatial position of the waste sheet body and the machine type and judging and verifying whether the waste can be smoothly discharged by calculating the sliding acceleration through force analysis, not only the accuracy and reliability of the design are improved, but also the workload and design time of the designer are greatly reduced, and the design efficiency is improved.

[0086] Such asFigures 7 - 8 As shown, obtain the positions of each waste sheet, and calculate the inclined plane angles of each preset reference waste chute, including the following sub-steps:

[0087] Successively obtain the spatial positions of each waste sheet, and the spatial position of the waste sheet is the three-dimensional coordinates of its center point;

[0088] If the type of the machine tool is such that there is no waste discharge hole in the middle of the machine tool, project the position of the waste sheet along the stamping vertical direction onto the surface of the lower die base to obtain the first projection position; project the position of the waste sheet along the stamping vertical direction onto the surface of the machine tool to obtain the second projection position, and calculate the straight-line distance between the first projection position and the second projection position;

[0089] Obtain the straight-line distance between the second projection position and the edge of the machine tool; according to the straight-line distance between the first projection position and the second projection position and the straight-line distance between the second projection position and the edge of the machine tool, calculate the inclined plane angles of each reference waste chute;

[0090] If the type of the machine tool is such that there is a waste discharge hole in the middle of the machine tool, project the position of the waste sheet along the stamping vertical direction onto the surface of the lower die base to obtain the first projection position; project the position of the waste sheet along the stamping vertical direction onto the surface of the machine tool to obtain the second projection position, and calculate the straight-line distance between the first projection position and the second projection position;

[0091] Judge the discharge orientation of each reference waste chute. If the discharge orientation is to discharge along the X-axis direction or the Y-axis direction to the edge of the machine tool, obtain the straight-line distance between the second projection position and the edge of the machine tool; according to the straight-line distance between the first projection position and the second projection position and the straight-line distance between the second projection position and the edge of the machine tool, calculate the inclined plane angles of each reference waste chute;

[0092] If it is discharged along the direction of the waste pointing to the waste hole of the machine tool, obtain the distance between the second projection position and the edge of the adjacent machine tool discharge hole; and according to the distance between the first projection position and the second projection position of the waste sheet and the distance between the second projection position and the edge of the machine tool discharge hole along the waste chute orientation, calculate the inclined plane angle of the waste chute.

[0093] It should be noted that the distance between the first projection position and the second projection position of the waste sheet and the position between the second projection position and the machine tool discharge position form a right triangle. According to this, the distance between the first projection position and the second projection position of the waste sheet and the distance between the second projection position and the edge of the machine tool discharge hole along the waste chute orientation can be solved by the arctangent function, and the length of the third side, that is, the length of the waste chute, can also be obtained according to the two perpendicular sides of the right triangle.

[0094] S3. Obtain the reference waste chutes corresponding to each waste sheet that can smoothly slide out, and select the waste chute with the shortest distance for each waste sheet from them as the tentative waste chute corresponding to the waste sheet;

[0095] Among them, step S3 includes the following sub-steps:

[0096] Construct a first temporary set, obtain the reference waste chutes corresponding to each waste sheet where the sliding acceleration on each corresponding reference waste chute is greater than 0, and add them to each temporary subset according to the classification of waste sheets;

[0097] Judge the number J of reference waste chutes added in each temporary subset n , if J n < 0, then output that the waste sheet with the corresponding number cannot be smoothly discharged; if J n = 1, then determine that this reference waste chute is the tentative waste chute for the waste sheet with the corresponding number; if J n > 1, then obtain the length distances of each reference waste chute in each temporary subset and sort them, and select the reference waste chute with the shortest distance as the tentative waste chute for the waste sheet with the corresponding number.

[0098] It should be noted that the waste chute with the shortest distance is selected as the tentative waste chute. In this case, the most materials are saved and smooth sliding can be ensured. If there is no data in the temporary subset, the system prompts the user that "the waste sheet with XXX number cannot slide smoothly in any direction!", and in this case, manual processing is required to design the waste discharge manually.

[0099] In addition, there will be a special situation. When the shortest distances of multiple reference waste chutes in a certain obtained temporary subset are the same and the waste sheet can smoothly slide out from the corresponding reference waste chutes in the corresponding directions, then replace the data of multiple reference waste chutes in the temporary subset corresponding to the waste sheet, and then make a judgment to select the optimal tentative waste chute during the subsequent waste chute merging process.

[0100] As Figure 9 shown, in this embodiment, since the shape of the waste may rotate at the moment it falls, to ensure that the waste completely falls into the waste chute, in this embodiment of the simulation process, the analysis and calculation are carried out along the sphere with the smallest diameter that wraps the waste; furthermore, after step S3, it also includes obtaining the dimensions of each waste sheet, and calculating the chute width of the tentative waste chute according to the dimensions of the waste sheet, where it includes the following sub-steps:

[0101] Obtain the dimensions of each waste sheet in sequence, construct a first inclusion body along the boundary of the waste sheet, the first inclusion body is circular, and the diameter of the first inclusion body is the distance between the two farthest ends of the waste sheet;

[0102] Calculate the chute width of the tentative waste chute for the waste sheet according to the diameter of the first inclusion body. The expression is as follows:

[0103] W n = D n + 2C;

[0104] In the formula, W n is the chute width of the tentative waste chute corresponding to the nth numbered waste sheet, D n is the diameter of the first inclusion body corresponding to the nth numbered waste sheet, and C is the safety distance.

[0105] S4. Preset a merging rule, and merge the tentative waste chutes according to the preset merging rule to determine the output of the final waste chute.

[0106] As Figures 10 - 11 shown, where step S4 includes the following sub-steps:

[0107] According to the spatial positions of the waste sheets, sequentially obtain the distances between each waste sheet and other waste sheets, and select the minimum value of the distances between each waste sheet and other waste sheets as the shortest distance between adjacent waste sheets;

[0108] Preset a waste chute merging threshold, compare the shortest distance between adjacent waste sheets with the preset waste chute merging threshold, and obtain the two adjacent waste sheets corresponding to the shortest distance between adjacent waste sheets that is less than the preset waste chute merging threshold;

[0109] Judge whether the discharge directions of the tentative waste chutes of the two corresponding adjacent waste sheets are the same. If the discharge directions are the same, merge the tentative waste chutes of the two adjacent waste sheets. If the discharge directions are not the same, do not merge, and determine the output of the final waste chute.

[0110] It should be noted that according to the spatial positions of the waste sheets, the distances between them, and the discharge directions of the waste chutes, the layout of the waste chutes is optimized to improve the efficiency and effect of waste treatment.

[0111] In this embodiment, it is judged whether the discharge directions of the tentative waste chutes of the two corresponding adjacent waste sheets are the same. If the discharge directions are the same, merge the tentative waste chutes of the two adjacent waste sheets. If the discharge directions are not the same, do not merge, and determine the output of the final waste chute. Among them, the following sub-steps are included:

[0112] Judge the positional relationship of the two adjacent waste sheets in the X-axis direction, Y-axis direction, and discharge direction;

[0113] As Figures 12 - 13The figure shows the schematic diagram of the first scenario for merging the tentative waste chutes. If the positions of two adjacent waste sheets are in a straight line in the X-axis direction or the Y-axis direction, and the extending direction of the straight line is the same as the discharging direction of the tentative waste chutes, then select the tentative waste chute with a longer distance as the merged waste chute.

[0114] As Figures 16 - 17 The figure shows the schematic diagram of the second scenario for merging the tentative waste chutes. If the positions of two adjacent waste sheets are in a straight line in the X-axis direction or the Y-axis direction, and it is inconsistent with the discharging direction of the tentative waste chutes, then delete any one of the tentative waste chutes and widen the other tentative waste chute towards the other waste sheet.

[0115] As Figures 14 - 15 The figure shows the schematic diagram of the third scenario for merging the tentative waste chutes. If the positions of two adjacent waste sheets are not in the same straight line and coincide in the X-axis direction or the Y-axis direction, then delete the tentative waste chute with a shorter distance, retain the tentative waste chute with a longer distance, and widen the chute towards the other waste sheet.

[0116] According to the merged waste chute, recalculate the sliding acceleration of the two adjacent waste sheets corresponding to the merged waste chute. If the sliding acceleration is greater than 0, then retain and output the merged waste chute; otherwise, do not perform the merging.

[0117] In this embodiment, the strategy based on merging the waste chutes takes into account the positional relationship of the waste sheets, the discharging direction of the tentative waste chutes, and the sliding acceleration, ensuring that the merged waste chute can effectively handle the waste and maintain a stable sliding process.

[0118] Specifically, if there are multiple shortest distances of the reference waste chutes in the temporary subset that are the same, and the waste chutes corresponding to the adjacent waste sheets are in a mergable state, then judge the discharging direction of the other waste chute, and then select the reference waste chute with the same direction from the multiple reference waste chutes with the same shortest distance as the tentative waste chute, and then judge the positions of the two adjacent tentative waste chutes for chute merging. If there are multiple shortest distances of the reference waste chutes in the temporary subset that are the same, but the waste chutes of the waste sheets do not meet the merging conditions, then arbitrarily select one of the reference waste chutes with a certain direction as the tentative waste chute.

[0119] As Figure 18As shown, wherein the widening of the slideway includes obtaining a first inclusion body of two adjacent waste sheet bodies; constructing a second inclusion body tangentially along the edge according to the first inclusion body of the two adjacent waste sheet bodies, and the first inclusion bodies of the two adjacent waste sheet bodies are all externally tangent to the second inclusion body, obtaining the diameter of the second inclusion body, calculating the width after the tentative waste slideway is widened according to the diameter of the second inclusion body, and the calculation process is the same as the calculation method of the slideway width of the tentative waste slideway of the waste sheet body.

[0120] According to this solution, by inputting the process digital model, the system can automatically identify and obtain all waste sheet bodies in the sheet metal die. Then, according to the spatial position and machine type of each waste sheet body, reference waste slideways with different discharge orientations are preset, and it is judged whether these slideways are suitable for the smooth discharge of waste. Subsequently, the system will screen out the reference slideways that can smoothly slide out the waste and select the one with the shortest distance as the tentative waste slideway for each waste sheet body; finally, according to the preset merging rules, the tentative waste slideways are merged to form the final waste slideway layout. By automatically identifying and obtaining waste sheet bodies, as well as presetting and screening waste slideways, the design efficiency is greatly improved, manual intervention and calculation time are reduced. By optimizing the selection and merging of waste slideways, it is ensured that the waste can be smoothly discharged along the shortest path, and the production cost is reduced, unnecessary material consumption is reduced. At the same time, this method also has high flexibility and can adapt to different types of sheet metal dies and machines, thus reducing the quality and efficiency of waste design for sheet metal dies.

[0121] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A design method for discharging scrap chute of sheet metal die, characterized in that, The method includes: S1. Input the process digital model and obtain all the scrap sheet bodies of the sheet metal die; S2. Obtain the spatial positions and machine types of the scrap sheet bodies, and preset reference scrap chutes with different discharge orientations for each scrap sheet body according to the machine type. The machine types include those with a scrap discharge hole in the middle of the machine and those without a scrap discharge hole in the middle of the machine. When the machine type is one without a scrap discharge hole in the middle of the machine, reference scrap chutes for discharging to the edge of the machine along the X-axis direction or the Y-axis direction are preset according to each scrap sheet body. When the machine type is one with a scrap discharge hole in the middle of the machine, reference scrap chutes for discharging to the edge of the machine along the X-axis direction or the Y-axis direction and reference scrap chutes for discharging to the scrap hole of the machine along the X-axis direction or the Y-axis direction are preset according to each scrap sheet body. And judge whether each scrap sheet body can be discharged along its preset reference scrap chute; Obtain the spatial positions of the scrap sheet bodies and calculate the inclined plane angles of the corresponding preset reference scrap chutes; Conduct a force calculation on the scrap sheet bodies corresponding to each reference scrap chute to obtain the sliding acceleration of each scrap sheet body on each corresponding reference scrap chute. The expression is: Wherein, n is the waste sheet body with the nth number obtained, i is the discharge direction of the ith preset reference waste chute in the waste sheet body with the nth number, is the sliding acceleration of the ith preset reference waste chute in the waste sheet body with the nth number, is the friction coefficient between the waste sheet body with the nth number and the corresponding ith preset reference waste chute, and g is the acceleration due to gravity, is the inclined plane angle of the ith preset reference waste chute in the waste sheet body with the nth number; Determine whether the sliding acceleration of each waste sheet on each corresponding reference waste chute is greater than 0. If the waste sheet can be discharged along its corresponding reference waste chute; S3. Obtain the reference scrap chutes through which each scrap sheet body slides out smoothly, and select the scrap chute with the shortest distance for each scrap sheet body from them as the tentative scrap chute for the corresponding scrap sheet body; and obtain the dimensions of each scrap sheet body, and calculate the chute width of the tentative scrap chute according to the dimensions of the scrap sheet body. Successively obtain the dimensions of each scrap sheet body, and construct a first inclusion body along the boundary of the scrap sheet. The first inclusion body is circular, and the diameter of the first inclusion body is the distance between the two farthest ends of the scrap sheet body. Calculate the chute width of the tentative scrap chute of the scrap sheet body according to the diameter of the first inclusion body. The expression is: W n = D n + 2C; Wherein, W n is the chute width of the tentative waste chute corresponding to the nth numbered waste sheet, D n is the diameter of the first inclusion corresponding to the nth numbered waste sheet, and C is the safety distance; S4. Preset a merging rule, and merge the tentative scrap chutes according to the preset merging rule to determine the output of the final scrap chute.

2. The design method for discharging scrap from a sheet metal mold chute according to claim 1, characterized in that In step S1, when inputting the process digital model and obtaining all the scrap sheet bodies of the sheet metal die, specifically, input the process digital model, calculate the area of each sheet body in the process digital model respectively, sort all the sheet bodies according to the size of the area, obtain all the sheet bodies except the one with the largest area, and encode them in sequence. All the encoded sheet bodies are the scrap sheet bodies.

3. The design method for discharging the waste chute of the sheet metal mold according to claim 1, characterized in that, When obtaining the positions of the scrap sheet bodies and calculating the inclined plane angles of the corresponding preset reference scrap chutes, specifically, it includes the following sub-steps: Successively obtain the spatial positions of the scrap sheet bodies. The spatial position of the scrap sheet body is the three-dimensional coordinates of its center point. When the machine type is one without a scrap discharge hole in the middle of the machine, project the position of the scrap sheet body onto the surface of the lower die base along the stamping vertical direction to obtain a first projection position; project the position of the scrap sheet body onto the surface of the machine along the stamping vertical direction to obtain a second projection position, and calculate the straight-line distance between the first projection position and the second projection position. Obtain the straight-line distance between the second projection position and the edge of the machine; calculate the inclined plane angles of the reference scrap chutes based on the straight-line distance between the first projection position and the second projection position and the straight-line distance between the second projection position and the edge of the machine. When the machine type has a waste discharge hole in the middle of the machine, project the position of the waste sheet along the stamping vertical direction onto the surface of the lower die base to obtain the first projection position; project the position of the waste sheet along the stamping vertical direction onto the surface of the machine to obtain the second projection position, and calculate the straight-line distance between the first projection position and the second projection position; Judge the discharge direction of each reference waste chute. If the discharge direction is to discharge to the edge of the machine along the X-axis direction or the Y-axis direction, then obtain the straight-line distance between the second projection position and the edge of the machine; according to the straight-line distance between the first projection position and the second projection position and the straight-line distance between the second projection position and the edge of the machine, calculate the inclined plane angle of each reference waste chute; If it is discharged along the direction of the waste pointing to the waste hole of the machine, then obtain the distance between the second projection position and the edge of the adjacent machine discharge hole; and according to the distance between the first projection position and the second projection position of the waste sheet and the distance between the second projection position and the edge of the machine discharge hole along the waste chute orientation, calculate the inclined plane angle of the waste chute.

4. The design method for discharging the waste chute of the sheet metal mold according to claim 1, characterized in that In step S3, obtain the reference waste chutes corresponding to each waste sheet that can slide out smoothly, and select the waste chute with the shortest distance for each waste sheet as the tentative waste chute corresponding to the waste sheet, where it includes the following sub-steps: Construct a first temporary set, obtain the reference waste chutes corresponding to each waste sheet when the sliding acceleration of each waste sheet in its corresponding reference waste chute is greater than 0, and add them to each temporary sub-set according to the classification of waste sheets; Judge the number J of reference waste chutes added in each temporary subset n , if J n < 0, then output that the waste sheet with the corresponding number cannot be discharged smoothly; if J n = 1, then determine that this reference waste chute is the tentative waste chute for the waste sheet with the corresponding number; if J n > 1, then obtain the length distances of each reference waste chute in each temporary subset and sort them, and select the reference waste chute with the shortest distance as the tentative waste chute for the waste sheet with the corresponding number.

5. The design method for the discharge of scrap chute of sheet metal die according to claim 1, characterized in that In step S4, the preset merging rule is used to merge the tentative waste chutes according to the preset merging rule to determine the output of the final waste chute, where it includes the following sub-steps: According to the spatial positions of each waste sheet, sequentially obtain the distances between each waste sheet and other waste sheets, and select the minimum value of the distances between each waste sheet and other waste sheets as the shortest distance between adjacent waste sheets; Preset a waste chute merging threshold, compare the shortest distance between adjacent waste sheets with the preset waste chute merging threshold, and obtain the adjacent two waste sheets corresponding to the shortest distance between adjacent waste sheets that is less than the preset waste chute merging threshold; Judge whether the discharge directions of the tentative waste chutes corresponding to the adjacent two waste sheets are the same. If the discharge directions are the same, then merge the tentative waste chutes of the adjacent two waste sheets. If the discharge directions are different, then do not merge, and determine the output of the final waste chute.

6. The design method for discharging scrap slides of sheet metal molds according to claim 5, characterized in that, For the judgment of whether the discharge directions of the tentative waste chutes corresponding to the adjacent two waste sheets are the same, if the discharge directions are the same, then merge the tentative waste chutes of the adjacent two waste sheets. If the discharge directions are different, then do not merge, and determine the output of the final waste chute, where it includes the following sub-steps: Judge the positional relationship between the adjacent two waste sheets in the X-axis direction, Y-axis direction and discharge direction; If the positions of two adjacent waste sheets are on the same straight line in the X-axis direction or the Y-axis direction, and the extending direction of the straight line is consistent with the discharging direction of the tentative waste chute, then select the tentative waste chute with the longer distance as the combined waste chute; If the positions of two adjacent waste sheets are on the same straight line in the X-axis direction or the Y-axis direction, and are inconsistent with the discharging direction of the tentative waste chute, then delete any one of the tentative waste chutes, and widen the other tentative waste chute towards the other waste sheet; If the positions of two adjacent waste sheets do not coincide on the same straight line in the X-axis direction or the Y-axis direction, then delete the tentative waste chute with the shorter distance, retain the tentative waste chute with the longer distance, and widen the chute towards the other waste sheet; According to the combined waste chute, recalculate the sliding acceleration of the corresponding two adjacent waste sheets on the combined waste chute. If the sliding acceleration is greater than 0, then retain and output the combined waste chute, otherwise no combination is performed.

7. The sheet metal die waste chute discharge design method according to claim 6, characterized in that The chute widening includes obtaining the first inclusion body of two adjacent waste sheets; constructing a second inclusion body tangent to the edge according to the first inclusion body of two adjacent waste sheets. The first inclusion bodies of the two adjacent waste sheets are all externally tangent to the second inclusion body, obtaining the diameter of the second inclusion body, and calculating the widened width of the tentative waste chute according to the diameter of the second inclusion body.

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