An intelligent design method for a trimming tool block and a screw pin of an automobile sheet metal stamping die

Abstract

The application discloses a trimming die block of an automobile sheet metal stamping die and an intelligent design method of a screw pin, abstracts the structure type of the trimming die block, formulates a standardized design process for the trimming die block, logically restricts the relationship of a trimming edge, a material pressing width, a vertical rib, a mounting flange, an inclined rib, a screw, a pin, hoisting, process input and a die block main body, and performs operation according to the logical relationship of each part in the intelligent generation process of the trimming die block and the screw pin, so that the main structure of the die block and standard parts can be quickly generated and various scene requirements are met.

Description

Technical Field

[0001] This invention belongs to the field of intelligent design of stamping equipment molds, and particularly relates to an intelligent design method for trimming cutter blocks and screw pins of automotive sheet metal stamping molds. Background Technology

[0002] In the process of realizing this invention, the inventors discovered that the prior art has at least the following problems:

[0003] Because automotive stamping intelligent equipment molds are developed as single pieces, each product is unique, structurally complex, and highly challenging to design. Due to differences in products, process solutions, customer technical standards, and production equipment, even when following unified design specifications, the structure of the same type of product (such as side panels, tailgates, and hoods) can vary significantly due to various complex scenarios. This places very high demands on the capabilities of design engineers and results in a long design and development cycle. For example, designing a side panel trimming mold manually using common CAD software in 3D model creation takes 25-30 days. With the rapid iteration and increasingly shorter development cycles of new energy vehicles, even higher demands are placed on mold development time. Design accounts for 25% of the mold development cycle, and labor costs are rising.

[0004] CN112541207B - Intelligent Design Method for Human-Machine Interaction of Stamping Dies, discloses an intelligent design method for human-machine interaction of stamping dies, including the following steps: S1, defining the relationship between system parameters, die parameters and human-machine interface; S2, defining the relationship between die functional modules and human-machine interface; S3, defining the relationship between die intelligent distribution algorithm module and human-machine interface; S4, generating virtual die components; S5, the die intelligent distribution algorithm module intelligently distributes the virtual die components to generate an overall three-dimensional die, but this method still cannot solve the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide an intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies. This method abstracts the structural types of trimming cutter blocks, establishes a standardized design process for them, and logically constrains the relationships between trimming cutting edges, blanking width, vertical ribs, mounting flanges, diagonal ribs, screws, pins, lifting mechanisms, process inputs, and the main body of the cutter block. During the intelligent generation of trimming cutter blocks and screws, calculations are performed based on the logical relationships of each part. The main structure and standard parts of the stamping die cutter block can be generated quickly, meeting the needs of various scenarios.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an intelligent design method for trimming cutter blocks and screw pins of automotive sheet metal stamping dies. The stamping die has an upper die body, a blank holder core, and a lower die body. The lower die body is mounted on the lower table of the press, the upper die body is mounted on the slide block of the machine tool, and the blank holder core is mounted in the die cavity. The slide block of the machine tool drives the upper die body and the blank holder core to move downward. The blank holder core first contacts the lower die body and is subjected to the force of the lower die surface. The nitrogen spring of the blank holder core is compressed through the blank holder core, and it continues to move. The trimming cutter block of the upper die and the trimming punch of the lower die work together to complete the trimming action.

[0007] The trimming blade is divided into 9 functional parts, including the trimming blade cutting edge, the blade pressing surface, the blade vertical rib position, the blade mounting flange, the blade spring pin, the blade lifting mechanism, the blade screw, the blade pin, and the blade diagonal rib.

[0008] The design methodology includes the following steps:

[0009] 1) Process starts, entering the tool block design stage:

[0010] 2) Obtain the cutting tool design input information. Required inputs include: process sheet body, trimming line, material thickness, equipment information, and process parameters.

[0011] 3) Based on the above input information, complete the basic construction of the main structure of the tool block and its supporting standard parts:

[0012] 4) Retrieve the tool block design standard, which is derived from the tool block parameter configuration table:

[0013] 5) Conduct the design and construction of the main reinforcement structure of the knife block:

[0014] 6) Complete the design of the blade flange structure:

[0015] 7) Construct the profile structure of the cutting block pressing surface:

[0016] 8) Design and process the cutting edge structure of the tool block:

[0017] 9) Arrange the screw mounting structure for the generated blade blocks:

[0018] 10) Arrange the tool block pin positioning structure:

[0019] 11) Design of the blade block with diagonal rib reinforcement structure:

[0020] 12) Add a lifting structure design for the cutting block:

[0021] 13) Complete the creation of the spring top pin structure:

[0022] 14) The entire automated design process for the cutting block is now complete.

[0023] Based on the variation of the trimming tool block parameter BH, the tool block structure is divided into two types: I: BH=0; II: BH>0.

[0024] The design process of the trimming cutter block is as follows: the program reads the trimming line and constructs the cutter block ribs by stretching. The program uses the process sheet to cut the ribs to generate the pressure surface. The cutting edge and retraction are constructed through the algorithm and the cutter block parameter configuration table. The cutter block structure shape controlled by parameters A1, A2, T, and BH is constructed through the algorithm and the cutter block parameter configuration table.

[0025] The design of the trimming tool block includes the following steps:

[0026] S1: Start the program and enter the automatic generation process flow of the cutting block process surface. The program reads and obtains a complete set of design input data, including: trimming line, trimming line stamping direction, pre-forming process surface, cutting block seam reference surface, cutting block bottom reference surface, cutting surface, reference coordinate system, cutting block body coordinate system, system planning data, and rule table data, providing complete geometric and rule constraints for subsequent automated modeling.

[0027] S2: Based on the preset process model object definition, automatically determine the type of the tool block to be designed. Identify the tool block category based on the input geometric information and rule definition. This process executes subsequent logic for the trimming tool branch.

[0028] S3: Determine the material type of the tool block blank by referring to the table, and distinguish between the two design branches of cast tool blocks and forged tool blocks:

[0029] Branch 1: Material determined to be casting:

[0030] S4-1: The program calls the main cross-sectional parameters T, t, BH, A2, B, and C of the tool block to automatically generate the process surface of the casting tool block; it performs differential judgment based on the LR parameters.

[0031] When LR > 0, the tool block process surface is generated using style I;

[0032] When LR=0, the tool block process surface is generated using style II, with the process surface expanding outward by 10mm around its perimeter; if style I fails to generate the process surface, then switch to style II to complete the process surface creation.

[0033] S4-2: Rules for determining the retraction structure of the cutter joint reference plane position: 1) If the angle between the cutter joint reference plane and the Z-axis of the reference coordinate system is 0°: the cutter joint reference plane is offset inward by 5mm to complete the cutter body splitting; after splitting, the lower end of the outer solid chamfer is trimmed to remove excess solid, the solid chamfer structure is retained, and the front and rear solids are Boolean summed; 2) If the angle between the cutter joint reference plane and the Z-axis of the reference coordinate system is greater than 0°: the retraction structure is automatically generated;

[0034] Branch Two: Material determined to be a forging:

[0035] S5-1: The program reads the cross-sectional parameters T, A1, B, and C of the main body of the cutting block and generates the process surface of the forging cutting block; based on the trimming line and the t parameter, the cutting block pressure surface is constructed, and the four boundaries of the pressure surface are expanded outward by 10mm;

[0036] S5-2: Execute the reference block determination logic: The program determines the reference block based on the outline of the trimming line before segmentation and the number of adjacent tool blocks in the same direction after segmentation.

[0037] S5-3: Execute the retraction structure rules for the forging seam reference surface: 1) Reference block: Both sides directly generate planes without creating additional retraction structures; 2) Non-reference block: Non-closed forging tools generate splicing surfaces only on one side, while the other side maintains a complete plane, and the entire side is a single flat surface.

[0038] S6: Batch import all generated data into the tool block body model. The data list includes: 1) the tool block process surface that has been created; 2) the tool block bottom reference plane corresponding to the intermediate process part; 3) the intersection surface; 4) the tool block body coordinate system; 5) the tool block seam reference plane; 6) the trimming tool infeed parameters output by the system planning; 7) the tool block body section parameters defined in the rule table - T, LT, LR, LA, R, BT;

[0039] S7: The process is complete, and the tool block model result containing complete geometric and parameter information is returned;

[0040] Based on the trimming line, trimming tool block standard, reference coordinate system, and tool block parameter configuration table, the parameters controlled by parameter H are used to generate the tool block screw mounting flange.

[0041] The design of the blade block screw mounting flange includes the following steps:

[0042] S1: Start the automatic generation program for the blade flange. The program reads the design data from the process intermediates and system planning table, and inputs the edge line of the trimming blade flange, the coordinate system of the blade flange, the reference plane of the bottom surface of the blade, and the flange thickness parameters into the three-dimensional model as geometric constraints and parameter basis for the automatic construction of the flange structure.

[0043] S2: Invoke the preset material determination rules to identify the type of the tool block blank, and execute the flange generation logic in two branches:

[0044] Branch 1: Determine the material of the cutting block as casting S3-1: Generate a flange entity according to the casting flange construction rules; set the upper surface of the casting flange to be parallel to the reference plane of the bottom surface of the cutting block, and assign the distance between the upper surface of the flange and the bottom surface of the cutting block to the read flange thickness parameter to complete the definition of the casting flange profile;

[0045] Branch 2: Determine the material of the cutting block as forging S4-1: Generate the flange entity according to the forging flange construction rules; the upper surface of the forging flange adopts a conformal surface design, and is offset upward along the stamping direction by a set distance with the blank holder surface as the reference. The default offset is 5mm, and this offset value supports custom parameter configuration.

[0046] S5: Complete the automated modeling of the flange structure, output the tool block model with flange features, and return to the previous state.

[0047] Based on the process input of trimming lines, trimming tool block standards, reference coordinate system, and tool block parameter configuration table, the parameters controlled by the construction parameter h are used to generate the tool block oblique ribs.

[0048] The design of the ribs for the blade block includes the following steps:

[0049] S1: Start the automatic generation program for the inclined rib of the cutter block. The program collects design input data and obtains the trimming line, the stamping direction of the trimming line, the reference plane of the bottom surface of the cutter block, and the cross-sectional parameters of the cutter block: T, t, BH, B, and the thickness of the inclined rib, providing geometric boundaries and parameter constraints for the calculation of the height of the inclined rib and the spatial arrangement.

[0050] S2: Calculate the control dimension A2 of the inclined rib based on the input parameters, determine the design height of the inclined rib, and calculate the A2 dimension in combination with the thickness of the inclined rib. This dimension is the lowest arrangement position of the lower end of the inclined rib after considering the wall thickness of the inclined rib. A2 is a variable value due to the influence of the conformal pressing surface. For single-sided flanges, A2 is directly used as the height of the inclined rib. For double-sided flanges, “A2′-40” mm is used as the height of the inclined rib, where the 40 mm offset can be configured with custom parameters.

[0051] S3: Complete the diagonal rib placement plan according to the diagonal rib position arrangement rules of the blade block:

[0052] 1. When the trimming line has an L-shaped or T-shaped corner structure, diagonal reinforcement is prohibited within a 100mm area around the corner point. This 100mm distance can be customized.

[0053] 2. For double-sided flange structures, the blade-side flange needs to be verified to meet the condition that “A2′-40” ≥ 50mm. Only if the condition is met can the diagonal ribs be generated. The back-opening flange follows the unified arrangement rules. The blade-side diagonal ribs and the back-opening diagonal ribs are arranged alternately along the trimming line.

[0054] 3. Search for possible placement points that satisfy A2≥50mm along the two endpoints of the trimming line; if the projection length of the trimming line between two valid points is less than 80mm, then discard the placement point on the side with the lower height of the inclined rib.

[0055] 4. The direction of the diagonal reinforcement should be perpendicular to the edge trimming line, and the overall arrangement should be as consistent as possible with the normal direction of the edge trimming line; avoid prohibited configurations. If non-compliant diagonal reinforcement shapes appear, the coordinate points of the diagonal reinforcement arrangement should be readjusted.

[0056] S4: Complete the parametric modeling of the diagonal reinforcement details:

[0057] 1. Beveled Rib Chamfer: After determining the height of the beveled rib -A2 or "A2′-40", a beveled chamfer structure is generated at a 30° position at the top of the beveled rib;

[0058] 2. The thickness of the diagonal reinforcement is generated according to the preset rule configuration table;

[0059] S5: Automated modeling of the inclined rib structure is completed, outputting a complete feature model of the inclined rib of the cutter block, and the process returns.

[0060] Intelligent design of screw pins is carried out based on the process input trimming line, blade flange boundary line, and standard rules for screw pin arrangement.

[0061] The design of a screw pin includes the following steps:

[0062] S1: Start the program and collect design input information. The program reads the flange boundary line, trimming line, bottom surface reference plane of the tool block, the geometry of the tool block body, the coordinate system of the tool block body, and the flange model as the geometric reference for the arrangement of standard parts.

[0063] S2: Match the screw and pin specifications to determine the maximum dimension L and minimum dimension W of the blade block body and the flange outer box. Determine the screw specifications by referring to the table based on dimensions L and W; select pins with the same specifications as the screws.

[0064] S3: Read the screw head style parameters planned by the system and select the screw structure type according to the system configuration, which is divided into boss style or countersunk style.

[0065] S4: Identify the geometry of the trimming line and determine the number of screws using two logical branches:

[0066] 1. Branch 1: The trimming line is straight, curved, or L-shaped. The number of screws is determined according to the preset table rules. The parameters inside the table can be customized. The number of pins is fixed at 2.

[0067] 2. Branch Two: For V-shaped, U-shaped, and semi-closed trimming lines, project the trimming lines along the stamping direction onto the bottom surface of the cutting block and measure the total length L of the projected lines; the formula for calculating the number of screws is: number of screws = L / 140, the parameter is configurable, and the calculation result is rounded to the nearest integer; the number of pins for fixing is 2;

[0068] S5: Execute the XY plane position arrangement rules for screws and pins:

[0069] 1. Straight / Curved / L-shaped cutting blocks: Arrange screws and pins at the boundary positions according to the corresponding diagram rules; when the number of screws is 3, 4, or 5, match the corresponding diagrams to complete the point arrangement; when the number of screws is greater than 2, the pins are equipped with a foolproof structure, and the front and rear pins are reserved with a 10mm staggered distance; at the same time, for various working conditions such as the flange and mold coordinate system being in the same or different directions, the presence or absence of back support, and the side cutting cutting block being relative to the wedge coordinate system, implement the coordinate rounding and datum alignment differential arrangement constraints. The cutting block without back support does not implement this rounding rule to ensure that the standard part coordinate system and the wedge coordinate system are consistent;

[0070] 2. U-shaped blade blocks: The spacing is set along the direction of the projected trimming line, and the total number of blade blocks is the calculated number of screws minus 1; the distance between the screw center and the side wedge and the flange boundary is generated according to the corresponding drawing dimensions;

[0071] S6: Execute the screw Z-axis positioning rule. After completing the XY coordinate positioning, determine the screw Z-axis coordinate according to the H and F parameters in the figure to complete the three-dimensional spatial positioning.

[0072] S7: The standard screw and pin parts are arranged. Output the complete tool block standard part model and return to the previous step.

[0073] One of the above technical solutions has the following advantages or beneficial effects: it abstracts the structural type of the trimming cutter block, formulates a standardized design process for the trimming cutter block, and logically constrains the relationship between the trimming cutting edge, blanking width, vertical ribs, mounting flanges, diagonal ribs, screws, pins, lifting, process input, and the main body of the cutter block. During the intelligent generation of the trimming cutter block and screws and pins, calculations are performed based on the logical relationship of each part. The main structure of the blanking die cutter block and standard parts can be generated quickly to meet the needs of various scenarios. Attached Figure Description

[0074] Figure 1 This is a schematic diagram of the structure of the automotive sheet metal stamping die provided in an embodiment of the present invention;

[0075] Figure 2 A schematic diagram of the functional components of the trimming tool block;

[0076] Figure 3 A schematic diagram of the scene structure for constructing the trimming blade block;

[0077] Figure 4 A schematic diagram showing the classification of trimming line shape types for trimming blade blocks;

[0078] Figure 5 Design a flowchart for the trimming tool block;

[0079] Figure 6 This is a schematic diagram of the structure of the casting cutter block;

[0080] Figure 7 This is a schematic diagram of the forged tool block structure;

[0081] Figure 8 This is a schematic diagram of the control parameters structure of the forging block;

[0082] Figure 9 -a indicates that the tool block construction type is I; Figure 9 -b indicates that the tool block construction type is II;

[0083] Figure 10 Flowchart of the main body construction of the cutting block;

[0084] Figure 11 Here is a flowchart of the blade flange construction process;

[0085] Figure 12 Flowchart for constructing the inclined reinforcement of the blade block;

[0086] Figure 13 Flowchart for constructing a screw pin;

[0087] Figure 14 Screw specifications;

[0088] Figure 15 This refers to the number of screws.

[0089] Figure 16 Screw layout;

[0090] The markings in the above figures are all:

[0091] 1. Upper mold body, 2. Trimming cutter block, 3. Pressure source, 4. Blank holder core, 5. Trimming punch, 6. Lower mold body, 7. Lower table of machine tool, 8. Slide block on machine tool.

[0092] 21. Cutting edge of the blade; 22. Pressing surface of the blade; 23. Vertical rib of the blade; 24. Mounting flange of the blade; 25. Spring pin of the blade; 26. Lifting mechanism of the blade; 27. Screw of the blade; 28. Pin of the blade; 29. ​​Diagonal rib of the blade. Detailed Implementation

[0093] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0094] Example 1

[0095] See Figures 1-16An intelligent design method for trimming cutter blocks and screw pins in automotive sheet metal stamping dies is disclosed. The stamping die has an upper die body, a blank holder, and a lower die body. The lower die body is mounted on the lower table of the press, and the upper die body is mounted on the slide block of the machine tool. The blank holder is installed in the die cavity. The slide block of the machine tool drives the upper die body and the blank holder to move downward. The blank holder first contacts the lower die body and is subjected to the force of the lower die surface. The blank holder's nitrogen spring is compressed through the blank holder, and it continues to move. The trimming cutter block of the upper die and the trimming punch of the lower die work together to complete the trimming action. The trimming cutter block is divided into 9 functional parts, including the trimming cutter block cutting edge surface, the cutter block blank holder surface, the cutter block vertical rib position, the cutter block mounting flange, the cutter block spring pin, the cutter block lifting, the cutter block screw, the cutter block pin, and the cutter block oblique rib.

[0096] The design method includes the following steps: 1) Start the process and enter the cutter block design stage; 2) Obtain the cutter block design input information, which includes: process sheet body, trimming line, material thickness, equipment information, and process parameters; 3) Based on the above input information, complete the basic construction of the main structure of the cutter block and its supporting standard parts; 4) Retrieve the cutter block design standard, which comes from the cutter block parameter configuration table; 5) Create and design the main rib structure of the cutter block; 6) Complete the design of the cutter block flange structure; 7) Construct the cutter block pressure surface profile structure; 8) Design and process the cutter block cutting edge structure; 9) Arrange and generate the cutter block screw mounting structure; 10) Arrange and generate the cutter block pin positioning structure; 11) Design the cutter block diagonal rib reinforcement structure; 12) Add the design of the cutter block lifting structure; 13) Complete the creation of the spring pin structure; 14) The entire automated cutter block design process ends.

[0097] The structural types of trimming cutter blocks are abstracted, and a standardized design process is established for trimming cutter blocks. Logical constraints are imposed on the relationships between trimming cutting edge, blanking width, vertical ribs, mounting flange, diagonal ribs, screws, pins, lifting, process input, and the main body of the cutter block. During the intelligent generation of trimming cutter blocks and screws and pins, calculations are performed based on the logical relationships of each part. The main structure of the blanking die cutter block and standard parts can be generated quickly to meet the needs of various scenarios.

[0098] Based on the variation of the trimming tool block parameter BH, the tool block structure is divided into two types: I: BH=0; II: BH>0.

[0099] The design process of the trimming cutter block is as follows: the program reads the trimming line and constructs the cutter block ribs by stretching. The program uses the process sheet to cut the ribs to generate the pressure surface. The cutting edge and retraction are constructed through the algorithm and the cutter block parameter configuration table. The cutter block structure shape controlled by parameters A1, A2, T, and BH is constructed through the algorithm and the cutter block parameter configuration table.

[0100] The design of the trimming tool block includes the following steps:

[0101] S1: Start the program and enter the automatic generation process flow of the cutting block process surface. The program reads and obtains a complete set of design input data, including: trimming line, trimming line stamping direction, pre-forming process surface, cutting block seam reference surface, cutting block bottom reference surface, cutting surface, reference coordinate system, cutting block body coordinate system, system planning data, and rule table data, providing complete geometric and rule constraints for subsequent automated modeling.

[0102] S2: Based on the preset process model object definition, automatically determine the type of the tool block to be designed. Identify the tool block category based on the input geometric information and rule definition. This process executes subsequent logic for the trimming tool branch.

[0103] S3: Determine the material type of the tool block blank by referring to the table, and distinguish between the two design branches of cast tool blocks and forged tool blocks:

[0104] Branch 1: Material determined to be casting:

[0105] S4-1: The program calls the main cross-sectional parameters T, t, BH, A2, B, and C of the tool block to automatically generate the process surface of the casting tool block; it performs differential judgment based on the LR parameters.

[0106] When LR > 0, the tool block process surface is generated using style I;

[0107] When LR=0, the tool block process surface is generated using style II, with the process surface expanding outward by 10mm around its perimeter; if style I fails to generate the process surface, then switch to style II to complete the process surface creation.

[0108] S4-2: Rules for determining the retraction structure of the cutter joint reference plane position: 1) If the angle between the cutter joint reference plane and the Z-axis of the reference coordinate system is 0°: the cutter joint reference plane is offset inward by 5mm to complete the cutter body splitting; after splitting, the lower end of the outer solid chamfer is trimmed to remove excess solid, the solid chamfer structure is retained, and the front and rear solids are Boolean summed; 2) If the angle between the cutter joint reference plane and the Z-axis of the reference coordinate system is greater than 0°: the retraction structure is automatically generated;

[0109] Branch Two: Material determined to be a forging:

[0110] S5-1: The program reads the cross-sectional parameters T, A1, B, and C of the main body of the cutting block and generates the process surface of the forging cutting block; based on the trimming line and the t parameter, the cutting block pressure surface is constructed, and the four boundaries of the pressure surface are expanded outward by 10mm;

[0111] S5-2: Execute the reference block determination logic: The program determines the reference block based on the outline of the trimming line before segmentation and the number of adjacent tool blocks in the same direction after segmentation.

[0112] S5-3: Execute the retraction structure rules for the forging seam reference surface: 1) Reference block: Both sides directly generate planes without creating additional retraction structures; 2) Non-reference block: Non-closed forging tools generate splicing surfaces only on one side, while the other side maintains a complete plane, and the entire side is a single flat surface.

[0113] S6: Batch import all generated data into the tool block body model. The data list includes: 1) the tool block process surface that has been created; 2) the tool block bottom reference plane corresponding to the intermediate process part; 3) the intersection surface; 4) the tool block body coordinate system; 5) the tool block seam reference plane; 6) the trimming tool infeed parameters output by the system planning; 7) the tool block body section parameters defined in the rule table - T, LT, LR, LA, R, BT;

[0114] S7: The process is complete, and the tool block model result containing complete geometric and parameter information is returned;

[0115] Based on the trimming line, trimming tool block standard, reference coordinate system, and tool block parameter configuration table, the parameters controlled by parameter H are used to generate the tool block screw mounting flange.

[0116] The design of the blade block screw mounting flange includes the following steps:

[0117] S1: Start the automatic generation program for the blade flange. The program reads the design data from the process intermediates and system planning table, and inputs the edge line of the trimming blade flange, the coordinate system of the blade flange, the reference plane of the bottom surface of the blade, and the flange thickness parameters into the three-dimensional model as geometric constraints and parameter basis for the automatic construction of the flange structure.

[0118] S2: Invoke the preset material determination rules to identify the type of the tool block blank, and execute the flange generation logic in two branches:

[0119] Branch 1: Determine the material of the cutting block as casting S3-1: Generate a flange entity according to the casting flange construction rules; set the upper surface of the casting flange to be parallel to the reference plane of the bottom surface of the cutting block, and assign the distance between the upper surface of the flange and the bottom surface of the cutting block to the read flange thickness parameter to complete the definition of the casting flange profile;

[0120] Branch 2: Determine the material of the cutting block as forging S4-1: Generate the flange entity according to the forging flange construction rules; the upper surface of the forging flange adopts a conformal surface design, and is offset upward along the stamping direction by a set distance with the blank holder surface as the reference. The default offset is 5mm, and this offset value supports custom parameter configuration.

[0121] S5: Complete the automated modeling of the flange structure, output the tool block model with flange features, and return to the previous state.

[0122] Based on the process input of trimming lines, trimming tool block standards, reference coordinate system, and tool block parameter configuration table, the parameters controlled by the construction parameter h are used to generate the tool block oblique ribs.

[0123] The design of the ribs for the blade block includes the following steps:

[0124] S1: Start the automatic generation program for the inclined rib of the cutter block. The program collects design input data and obtains the trimming line, the stamping direction of the trimming line, the reference plane of the bottom surface of the cutter block, and the cross-sectional parameters of the cutter block: T, t, BH, B, and the thickness of the inclined rib, providing geometric boundaries and parameter constraints for the calculation of the height of the inclined rib and the spatial arrangement.

[0125] S2: Calculate the control dimension A2 of the inclined rib based on the input parameters, determine the design height of the inclined rib, and calculate the A2 dimension in combination with the thickness of the inclined rib. This dimension is the lowest arrangement position of the lower end of the inclined rib after considering the wall thickness of the inclined rib. A2 is a variable value due to the influence of the conformal pressing surface. For single-sided flanges, A2 is directly used as the height of the inclined rib. For double-sided flanges, “A2′-40” mm is used as the height of the inclined rib, where the 40 mm offset can be configured with custom parameters.

[0126] S3: Complete the diagonal rib placement plan according to the diagonal rib position arrangement rules of the blade block:

[0127] 1. When the trimming line has an L-shaped or T-shaped corner structure, diagonal reinforcement is prohibited within a 100mm area around the corner point. This 100mm distance can be customized.

[0128] 2. For double-sided flange structures, the blade-side flange needs to be verified to meet the condition that “A2′-40” ≥ 50mm. Only if the condition is met can the diagonal ribs be generated. The back-opening flange follows the unified arrangement rules. The blade-side diagonal ribs and the back-opening diagonal ribs are arranged alternately along the trimming line.

[0129] 3. Search for possible placement points that satisfy A2≥50mm along the two endpoints of the trimming line; if the projection length of the trimming line between two valid points is less than 80mm, then discard the placement point on the side with the lower height of the inclined rib.

[0130] 4. The direction of the diagonal reinforcement should be perpendicular to the edge trimming line, and the overall arrangement should be as consistent as possible with the normal direction of the edge trimming line; avoid prohibited configurations. If non-compliant diagonal reinforcement shapes appear, the coordinate points of the diagonal reinforcement arrangement should be readjusted.

[0131] S4: Complete the parametric modeling of the diagonal reinforcement details:

[0132] 1. Beveled Rib Chamfer: After determining the height of the beveled rib -A2 or "A2′-40", a beveled chamfer structure is generated at a 30° position at the top of the beveled rib;

[0133] 2. The thickness of the diagonal reinforcement is generated according to the preset rule configuration table;

[0134] S5: Automated modeling of the inclined rib structure is completed, outputting a complete feature model of the inclined rib of the cutter block, and the process returns.

[0135] Intelligent design of screw pins is carried out based on the process input trimming line, blade flange boundary line, and standard rules for screw pin arrangement.

[0136] The design of a screw pin includes the following steps:

[0137] S1: Start the program and collect design input information. The program reads the flange boundary line, trimming line, bottom surface reference plane of the tool block, the geometry of the tool block body, the coordinate system of the tool block body, and the flange model as the geometric reference for the arrangement of standard parts.

[0138] S2: Match the screw and pin specifications to determine the maximum dimension L and minimum dimension W of the blade block body and the flange outer box. Determine the screw specifications by referring to the table based on dimensions L and W; select pins with the same specifications as the screws.

[0139] S3: Read the screw head style parameters planned by the system and select the screw structure type according to the system configuration, which is divided into boss style or countersunk style.

[0140] S4: Identify the geometry of the trimming line and determine the number of screws using two logical branches:

[0141] 1. Branch 1: The trimming line is straight, curved, or L-shaped. The number of screws is determined according to the preset table rules. The parameters inside the table can be customized. The number of pins is fixed at 2.

[0142] 2. Branch Two: For V-shaped, U-shaped, and semi-closed trimming lines, project the trimming lines along the stamping direction onto the bottom surface of the cutting block and measure the total length L of the projected lines; the formula for calculating the number of screws is: number of screws = L / 140, the parameter is configurable, and the calculation result is rounded to the nearest integer; the number of pins for fixing is 2;

[0143] S5: Execute the XY plane position arrangement rules for screws and pins:

[0144] 1. Straight / Curved / L-shaped cutting blocks: Arrange screws and pins at the boundary positions according to the corresponding diagram rules; when the number of screws is 3, 4, or 5, match the corresponding diagrams to complete the point arrangement; when the number of screws is greater than 2, the pins are equipped with a foolproof structure, and the front and rear pins are reserved with a 10mm staggered distance; at the same time, for various working conditions such as the flange and mold coordinate system being in the same or different directions, the presence or absence of back support, and the side cutting cutting block being relative to the wedge coordinate system, implement the coordinate rounding and datum alignment differential arrangement constraints. The cutting block without back support does not implement this rounding rule to ensure that the standard part coordinate system and the wedge coordinate system are consistent;

[0145] 2. U-shaped blade blocks: The spacing is set along the direction of the projected trimming line, and the total number of blade blocks is the calculated number of screws minus 1; the distance between the screw center and the side wedge and the flange boundary is generated according to the corresponding drawing dimensions;

[0146] S6: Execute the screw Z-axis positioning rule. After completing the XY coordinate positioning, determine the screw Z-axis coordinate according to the H and F parameters in the figure to complete the three-dimensional spatial positioning.

[0147] S7: The standard screw and pin parts are arranged. Output the complete tool block standard part model and return to the previous step.

[0148] After adopting the above scheme, the structural type of the trimming cutter block is abstracted, and a standardized design process is formulated for the trimming cutter block. Logical constraints are imposed on the relationship between the trimming cutting edge, blanking width, vertical ribs, mounting flange, diagonal ribs, screws, pins, lifting, process input, and the main body of the cutter block. During the intelligent generation of the trimming cutter block and screws and pins, calculations are performed based on the logical relationship of each part. The main structure of the blanking die cutter block and standard parts can be generated quickly to meet the needs of various scenarios.

[0149] Example 2

[0150] In this embodiment, the blanking die mainly consists of three parts: 1. upper die body, 2. blank holder, and 3. lower die body (the lower die can be divided into a punch and a punch holder, as determined by customer specifications and actual development). The trimming die is based on the following relationship between its main components: the lower die body is mounted on the lower table of the press, the upper die body is mounted on the slide of the machine tool, and the blank holder is mounted in the die cavity. The slide of the machine tool drives the upper die body and the blank holder to move downward. The blank holder first contacts the lower die body and is subjected to the force of the lower die surface. The blank holder's nitrogen spring is compressed through the blank holder, and it continues to move. The trimming cutter of the upper die and the trimming punch of the lower die work together to complete the trimming function, realize the blanking of waste material, and end one work cycle.

[0151] Stamping production consists of trimming dies and equipment, mainly composed of 8 modules: 1. Upper die body, 2. Trimming cutter block, 3. Pressure source, 4. Blank holder, 5. Trimming punch, 6. Lower die body, 7. Machine tool lower table, 8. Machine tool slide.

[0152] The trimming blade module is divided into 9 functional parts. These 9 functions and the 7 functional screws are designed intelligently using intelligent methods. 21. Blade edge surface, 22. Blade pressing surface, 23. Blade vertical rib, 24. Blade mounting flange, 25. Blade spring pin, 26. Blade lifting mechanism, 27. Blade screw, 28. Blade pin, 29. Blade diagonal rib.

[0153] Due to differences in product shape and other factors, the design of trimming blade blocks varies greatly across different scenarios, leading to numerous structural variations and consequently complex practical applications. Figure 3 As shown.

[0154] To achieve intelligent design of trimming blades and screw pins, the blades are categorized according to the shape type of the trimming line's planar projection, such as... Figure 4 As shown.

[0155] Based on the requirements of intelligent design logic, a design process for trimming tool blocks that conforms to intelligent design is constructed, such as... Figure 5 As shown.

[0156] To meet the needs of various customers and scenarios, the composition of the tool block is standardized and abstracted. The dimensions of the tool block structure are parameterized and represented by letters, forming a tool block parameter configuration table. The parameter diagram and corresponding table are shown below. Figure 6 , 7 As shown in Figure 8.

[0157] Based on the variation of the trimming tool block parameter BH, Ⅰ: BH=0, Ⅱ: BH>0, the tool block structure is divided into two types, such as... Figure 9 As shown.

[0158] Intelligent generation of the cutter block body and method, steps and rules for the arrangement of cutter block screws:

[0159] 1. Select and call customer templates based on customer needs and planning requirements, including: trimming blade block style, trimming blade block construction parameters, and punching force coefficient.

[0160] 2. Generate the main body of the trimming blade block based on the process data and design plan.

[0161] Construction Method and Rules: The program reads the trimming line and constructs the blade rib 3 using an extrusion method. The program uses the process sheet to cut the rib to generate the pressure surface 2. The cutting edge and retraction 1 are constructed through the algorithm and blade parameter configuration table. The blade structure shape controlled by parameters A1, A2, T, and BH is constructed through the algorithm and blade parameter configuration table. The construction scheme and process are as follows: Figure 10 As shown.

[0162] 3. Based on the trimming line, trimming tool block standard, reference coordinate system, and tool block parameter configuration table, generate the tool block screw mounting flange by constructing parameter H. 4. Construction scheme and process are as follows: Figure 11 As shown.

[0163] 4. Based on the process input of the trimming line, trimming tool block standard, reference coordinate system, and tool block parameter configuration table, generate the tool block oblique rib 9 by constructing the parameter h. The construction scheme and process are as follows: Figure 12 As shown.

[0164] 5. Based on the process input trimming line, blade flange boundary line, and standard rules for bolt arrangement, perform intelligent design of bolts. The construction process and rules are as follows: Figure 13 As shown.

[0165] (1) Screw size selection generation rules: Take the cuboid envelope box of the insert plane projection, define the short side of the cuboid as W, and the long side as L. The dimensions of W and L are configurable, such as... Figure 14 As shown.

[0166] (2) Screw quantity design rules: Take the diagonal length of the rectangular prism envelope box projected by the insert plane as the reference dimension, such as... Figure 15 As shown.

[0167] (3) The dimensional relationship between the screw and the insert is regular, such as Figure 16 As shown.

[0168] (4) Optimize the initial point: The number of screws / pins is the placement point. When the number of points is less than 3, the endpoint of one side of the trimming line is taken as the starting point. When the number of points is greater than or equal to 3, the endpoints of both sides of the trimming line are taken.

[0169] (5) Adjacent screws meet the minimum spacing d (parameter can be configured);

[0170] (6) All screw connections form a closed curve. Find the optimal solution that maximizes the area occupied by the curve and the flange boundary.

[0171] (7) Candidates: Influence range: all circles with the screw as the center and a radius of 70 intersect with the flange, and the circle with the largest area is preferred;

[0172] (8) The distance between A, B, M, and N in the diagram should be greater than or equal to the required distance between them;

[0173] (9) Arrange the screws first and then the pins. The line connecting the centers of the pins should not be parallel to the flange boundary (to prevent mistakes).

[0174] (10) When arranging the screw pins, it is necessary to consider avoiding the position of the spring pin at the inflection point;

[0175] (11) Screws and pins need to avoid the diagonal reinforcement.

[0176] After adopting the above scheme, the structural type of the trimming cutter block is abstracted, and a standardized design process is formulated for the trimming cutter block. Logical constraints are imposed on the relationship between the trimming cutting edge, blanking width, vertical ribs, mounting flange, diagonal ribs, screws, pins, lifting, process input, and the main body of the cutter block. During the intelligent generation of the trimming cutter block and screws and pins, calculations are performed based on the logical relationship of each part. The main structure of the blanking die cutter block and standard parts can be generated quickly to meet the needs of various scenarios.

[0177] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0178] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0179] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for intelligent design of trimming cutter blocks and screw pins for automotive sheet metal stamping dies, characterized in that, The stamping die has an upper die body, a blank holder, and a lower die body. The lower die body is mounted on the lower table of the press, the upper die body is mounted on the slide of the machine tool, and the blank holder is mounted in the die cavity. The slide of the machine tool drives the upper die body and the blank holder to move downward. The blank holder first contacts the lower die body and is subjected to the force of the lower die surface. The nitrogen spring of the blank holder is compressed through the blank holder, and it continues to move. The trimming cutter of the upper die and the trimming punch of the lower die work together to complete the trimming action. The trimming blade is divided into 9 functional parts, including the trimming blade cutting edge, the blade pressing surface, the blade vertical rib position, the blade mounting flange, the blade spring pin, the blade lifting mechanism, the blade screw, the blade pin, and the blade diagonal rib. The design methodology includes the following steps: 1) Process starts, entering the tool block design stage: 2) Obtain the cutting tool design input information. Required inputs include: process sheet body, trimming line, material thickness, equipment information, and process parameters. 3) Based on the above input information, complete the basic construction of the main structure of the tool block and its supporting standard parts: 4) Retrieve the tool block design standard, which is derived from the tool block parameter configuration table: 5) Conduct the design and construction of the main reinforcement structure of the knife block: 6) Complete the design of the blade flange structure: 7) Construct the profile structure of the cutting block pressing surface: 8) Design and process the cutting edge structure of the tool block: 9) Arrange the screw mounting structure for the generated blade blocks: 10) Arrange the tool block pin positioning structure: 11) Design of the blade block with diagonal rib reinforcement structure: 12) Add a lifting structure design for the cutting block: 13) Complete the creation of the spring top pin structure: 14) The entire automated design process for the cutting block is now complete.

2. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 1, characterized in that, Based on the variation of the trimming tool block parameter BH, the tool block structure is divided into two types: I: BH=0; II: BH>0.

3. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 2, characterized in that, The design process of the trimming cutter block is as follows: the program reads the trimming line and constructs the cutter block ribs by stretching. The program uses the process sheet to cut the ribs to generate the pressure surface. The cutting edge and retraction are constructed through the algorithm and the cutter block parameter configuration table. The cutter block structure shape controlled by parameters A1, A2, T, and BH is constructed through the algorithm and the cutter block parameter configuration table.

4. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 3, characterized in that, The design of the trimming tool block includes the following steps: S1: Start the program and enter the automatic generation process flow of the cutting block process surface. The program reads and obtains a complete set of design input data, including: trimming line, trimming line stamping direction, pre-forming process surface, cutting block seam reference surface, cutting block bottom reference surface, cutting surface, reference coordinate system, cutting block body coordinate system, system planning data, and rule table data, providing complete geometric and rule constraints for subsequent automated modeling. S2: Based on the preset process model object definition, automatically determine the type of the tool block to be designed. Identify the tool block category based on the input geometric information and rule definition. This process executes subsequent logic for the trimming tool branch. S3: Determine the material type of the tool block blank by referring to the table, and distinguish between the two design branches of cast tool blocks and forged tool blocks: Branch 1: Material determined to be casting: S4-1: The program calls the main cross-sectional parameters T, t, BH, A2, B, and C of the tool block to automatically generate the process surface of the casting tool block; it performs differential judgment based on the LR parameters. When LR > 0, the tool block process surface is generated using style I; When LR=0, the tool block process surface is generated using style II, with the process surface expanding outward by 10mm around its perimeter; if style I fails to generate the process surface, then switch to style II to complete the process surface creation. S4-2: Rules for determining the retraction structure of the cutter joint reference plane position: 1) If the angle between the cutter joint reference plane and the Z-axis of the reference coordinate system is 0°: the cutter joint reference plane is offset inward by 5mm to complete the cutter body splitting; after splitting, the lower end of the outer solid chamfer is trimmed to remove excess solid, the solid chamfer structure is retained, and the front and rear solids are Boolean summed; 2) If the angle between the cutter joint reference plane and the Z-axis of the reference coordinate system is greater than 0°: the retraction structure is automatically generated; Branch Two: Material determined to be a forging: S5-1: The program reads the cross-sectional parameters T, A1, B, and C of the main body of the cutting block and generates the process surface of the forging cutting block; based on the trimming line and the t parameter, the cutting block pressure surface is constructed, and the four boundaries of the pressure surface are expanded outward by 10mm; S5-2: Execute the reference block determination logic: The program determines the reference block based on the outline of the trimming line before segmentation and the number of adjacent tool blocks in the same direction after segmentation. S5-3: Execute the retraction structure rules for the forging seam reference surface: 1) Reference block: Both sides directly generate planes without creating additional retraction structures; 2) Non-reference block: Non-closed forging tools generate splicing surfaces only on one side, while the other side maintains a complete plane, and the entire side is a single flat surface. S6: Batch import all generated data into the tool block body model. The data list includes: 1) the tool block process surface that has been created; 2) the tool block bottom reference plane corresponding to the intermediate process part; 3) the intersection surface; 4) the tool block body coordinate system; 5) the tool block seam reference plane; 6) the trimming tool infeed parameters output by the system planning; 7) the tool block body section parameters defined in the rule table - T, LT, LR, LA, R, BT; S7: The process is complete, and the tool block model result containing complete geometric and parameter information is returned.

5. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 4, characterized in that, Based on the trimming line, trimming tool block standard, reference coordinate system, and tool block parameter configuration table, the parameters controlled by parameter H are used to generate the tool block screw mounting flange.

6. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 5, characterized in that, The design of the blade block screw mounting flange includes the following steps: S1: Start the automatic generation program for the blade flange. The program reads the design data from the process intermediates and system planning table, and inputs the edge trimming blade flange boundary line, blade flange coordinate system, blade bottom surface reference plane, and flange thickness parameters into the three-dimensional model as geometric constraints and parameter basis for the automatic construction of the flange structure. S2: Invoke the preset material determination rules to identify the type of the tool block blank, and execute the flange generation logic in two branches: Branch 1: Determine the material of the cutting block as casting S3-1: Generate a flange entity according to the casting flange construction rules; set the upper surface of the casting flange to be parallel to the reference plane of the bottom surface of the cutting block, and assign the distance between the upper surface of the flange and the bottom surface of the cutting block to the read flange thickness parameter to complete the definition of the casting flange profile; Branch 2: Determine the material of the cutting block as forging S4-1: Generate the flange entity according to the forging flange construction rules; the upper surface of the forging flange adopts a conformal surface design, and is offset upward along the stamping direction by a set distance with the blank holder surface as the reference. The default offset is 5mm, and this offset value supports custom parameter configuration. S5: Complete the automated modeling of the flange structure, output the tool block model with flange features, and return to the previous state.

7. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 6, characterized in that, Based on the process input of trimming lines, trimming tool block standards, reference coordinate system, and tool block parameter configuration table, the parameters controlled by the construction parameter h are used to generate the tool block oblique ribs.

8. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 7, characterized in that, The design of the ribs for the blade block includes the following steps: S1: Start the automatic generation program for the inclined rib of the cutter block. The program collects design input data and obtains the trimming line, the stamping direction of the trimming line, the reference plane of the bottom surface of the cutter block, and the cross-sectional parameters of the cutter block: T, t, BH, B, and the thickness of the inclined rib, providing geometric boundaries and parameter constraints for the calculation of the height of the inclined rib and the spatial arrangement. S2: Calculate the control dimension A2 of the inclined rib based on the input parameters, determine the design height of the inclined rib, and calculate the A2 dimension in combination with the thickness of the inclined rib. This dimension is the lowest arrangement position of the lower end of the inclined rib after considering the wall thickness of the inclined rib. A2 is a variable value due to the influence of the conformal pressing surface. For single-sided flanges, A2 is directly used as the height of the inclined rib. For double-sided flanges, "A2′-40" mm is used as the height of the inclined rib, where the 40 mm offset can be configured with custom parameters. S3: Complete the diagonal rib placement plan according to the diagonal rib position arrangement rules of the blade block: 1) When the trimming line has an L-shaped or T-shaped corner structure, diagonal ribs are prohibited within a 100mm area around the corner point. This 100mm distance can be customized. 2) For double-sided flange structures, the flange on the cutting edge side needs to be checked to ensure that "A2′-40" ≥ 50mm. Only if the condition is met can the diagonal rib be generated. The flange on the back side follows the same arrangement rules; the diagonal ribs on the cutting edge side and the diagonal ribs on the back side are arranged alternately along the trimming line. 3) Search for possible placement points that satisfy A2≥50mm along the two endpoints of the trimming line; if the projection length of the trimming line between two valid points is less than 80mm, then discard the placement point on the side with the lower diagonal rib height. 4) The direction of the diagonal reinforcement is perpendicular to the edge trimming line, and the overall arrangement should be as consistent as possible with the normal of the edge trimming line; avoid prohibited configurations. If non-compliant diagonal reinforcement shapes appear, the coordinate points of the diagonal reinforcement arrangement should be readjusted. S4: Complete the parametric modeling of the diagonal reinforcement details: 1) Beveled Rib Chamfer: After determining the height of the beveled rib -A2 or "A2′-40", a beveled chamfer structure is generated at a 30° position at the top of the beveled rib; 2) The thickness of the diagonal reinforcement is generated according to the preset rule configuration table; S5: Automated modeling of the inclined rib structure is completed, outputting a complete feature model of the inclined rib of the cutter block, and the process returns.

9. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 8, characterized in that, Intelligent design of screw pins is carried out based on the process input trimming line, blade flange boundary line, and standard rules for screw pin arrangement.

10. The intelligent design method for trimming cutter blocks and screws in automotive sheet metal stamping dies as described in claim 9, characterized in that, The design of a screw pin includes the following steps: S1: Start the program and collect design input information. The program reads the flange boundary line, trimming line, bottom surface reference plane of the tool block, the geometry of the tool block body, the coordinate system of the tool block body, and the flange model as the geometric reference for the arrangement of standard parts. S2: Match the screw and pin specifications to determine the maximum dimension L and minimum dimension W of the blade block body and the flange outer box. Determine the screw specifications by referring to the table based on dimensions L and W; select pins with the same specifications as the screws. S3: Read the screw head style parameters planned by the system and select the screw structure type according to the system configuration, which is divided into boss style or countersunk style. S4: Identify the geometry of the trimming line and determine the number of screws using two logical branches: 1) Branch 1: The trimming line is straight, curved, or L-shaped. The number of screws is determined according to the preset table rules. The parameters inside the table can be customized. The number of pins is fixed at 2. 2). Branch Two: For V-shaped, U-shaped, and semi-closed trimming lines, project the trimming lines along the stamping direction onto the bottom surface of the cutting block and measure the total length L of the projected lines; The formula for calculating the number of screws is: Number of screws = L / 140, the parameter is configurable, and the calculation result is rounded to the nearest integer; The number of pins for fixing is 2. S5: Execute the XY plane position arrangement rules for screws and pins: 1) Straight / Curved / L-shaped cutting blocks: Arrange screws and pins at the boundary positions according to the corresponding diagram rules; when the number of screws is 3, 4, or 5, match the corresponding diagrams to complete the point arrangement; when the number of screws is greater than 2, the pins are equipped with a foolproof structure, and the front and rear pins are reserved with a 10mm staggered distance; at the same time, for various working conditions such as the flange and mold coordinate system being in the same or different directions, with or without back support, and the side cutting cutting block being relative to the wedge coordinate system, implement the coordinate rounding and datum alignment differential arrangement constraints; the cutting block without back support does not implement this rounding rule to ensure that the standard part coordinate system and the wedge coordinate system are consistent; 2) U-shaped cutter blocks: The spacing is set along the direction of the trimming line after projection, and the total number of blocks is the calculated number of screws minus 1; the distance between the screw center and the side wedge and the flange boundary is generated according to the corresponding drawing dimensions; S6: Execute the screw Z-axis positioning rule. After completing the XY coordinate positioning, determine the screw Z-axis coordinate according to the H and F parameters in the figure to complete the three-dimensional spatial positioning. S7: The standard screw and pin parts are arranged. Output the complete tool block standard part model and return to the previous step.

Images