A method for obtaining an intelligent alternating drawing formula for a double-action drawing die for large deep pelvic parts

Abstract

This invention provides a method for obtaining intelligent alternating deep drawing formulas for a dual-action deep drawing die for large deep-cavity parts. The lower die assembly, blank holder assembly, and upper die assembly of the deep drawing die each contain motion interference components significantly larger than the worktable, outer slider, and inner slider of the deep drawing equipment. The method addresses the problem of mounting ultra-large deep drawing dies and equipment by designing a combination structure of the lower die assembly, blank holder assembly, and upper die assembly with non-uniform cross-sectional contours of their upper and lower surfaces. It solves the problem of reliable operation of ultra-large deep drawing dies by designing external and internal guiding mechanisms, rationally matching the guiding stroke, and adopting indirect guiding transmission. Furthermore, it utilizes the geometric height relationship between die components to set intelligent motion parameter formulas, controlling the limit displacement difference between die components to avoid rigid collisions between the die and equipment, and between the die components themselves. This technology can maximize the processing potential of existing dual-action deep drawing equipment, achieving integral forming of ultra-long and ultra-wide large deep-cavity thin-shell parts, and in particular, increasing the forming width limit to twice that of existing technologies.

Description

Technical Field

[0001] This invention relates to a sheet metal manufacturing technology in the field of aircraft manufacturing, specifically a method for obtaining intelligent alternating deep drawing formulas for large deep-cavity parts using a dual-action deep drawing die. Background Technology

[0002] As new aircraft development demands increasingly higher standards for service life and aerodynamic characteristics, the integral forming of large sheet metal parts will significantly reduce deformation caused by welding or riveting. This not only allows for lighter structures but also significantly improves assembly coordination accuracy and efficiency. Therefore, integral forming of ultra-large thin-walled parts is receiving increasing attention in aircraft applications.

[0003] As is well known, deep drawing is one of the suitable methods for forming deep-formed parts in the field of plastic processing. The main die structures to choose from are single-action deep drawing dies and double-action deep drawing dies. Single-action deep drawing relies on ejector pins around the punch to provide blank holder force. To ensure uniform blank holder force around the part, the maximum width of the blank holder force that single-action deep drawing can provide on mainstream large-scale deep drawing equipment in China is only 1.6 meters. Therefore, the maximum forming diameter is limited to 1.4 meters and the depth to a cavity or basin is less than 0.1 meters. As the required forming depth increases, the maximum forming diameter will further decrease. Double-action deep drawing relies on the outer slider of the equipment to provide blank holder force. It is suitable for ultra-large dies where the blank holder ring and die are installed almost on the entire table surface. However, the double-action principle requires the upper die to be embedded inside the outer slider along with the inner slider. Currently, the effective dimensions of the worktable and outer slider on mainstream large-scale deep drawing equipment in China are 1.96 meters x 3.3 meters, while the inner slider dimensions are only 1.4 meters x 1.65 meters. Due to the limitations of the double-action deep drawing principle and equipment structure, conventional mold structures cannot realize the potential of double-action deep drawing equipment to form larger parts. In particular, the air intake of large and medium-sized aircraft engines and the engine tail nozzle skin are irregular circles. The blank required for the whole is about 3.1 meters in diameter, which not only far exceeds the limit of the mold mounting on the equipment worktable, but also the effective forming surface width is twice that of the inner slide.

[0004] Alternating deep drawing essentially prevents rigid collisions between the mold and the equipment, and between the mold's own components, by controlling the sequence of mold component movements, matching component movement speeds, and monitoring displacement differences between equipment components. Therefore, alternating functional deep drawing dies not only meet the basic requirements of conventional dies but also need to consider numerous factors such as motion interference between components and the difference in independent movement rates between the inner and outer sliders of the equipment. This is one of the urgent engineering application challenges that needs to be overcome to achieve lightweight, integral forming of larger, more complex three-dimensional parts in the plastics industry. Summary of the Invention

[0005] This invention provides a method for obtaining intelligent alternating deep drawing formulas using a dual-action deep drawing die for large, deep-cavity parts. This method overcomes the limitations of existing deep drawing dies and forming methods, which are constrained by the dual-action deep drawing principle and equipment structure, hindering the formation of larger parts, especially for ultra-large cavity parts and ultra-long, wide, deep-cavity parts. The invention designs and combines die components with matching geometric and kinematic relationships between components and between the die and equipment. Combined with the equipment's CNC commands and early warning system, it controls the equipment components to maintain coordinated movement within a reasonable displacement range, autonomously coordinating displacement relationships and preventing rigid collisions during deep drawing.

[0006] This invention provides a method for obtaining intelligent alternating deep drawing formulas using a dual-action deep drawing die for large deep-cavity parts, mainly comprising the following steps:

[0007] Step 1) Based on the height difference between the top surfaces of the upper mold adapter plate 16 and the pressure plate adapter plate 12 in the mold closing state, determine the lower limit displacement difference of the outer and inner sliders during the movement process of the deep drawing equipment.

[0008] Step 2) Based on the height difference between the top surface of the pressure plate 12 and the guide boss 22 of the upper mold base 14 in the mold closing state, determine the upper limit displacement difference of the outer and inner sliders during the movement process of the deep drawing equipment.

[0009] Step 3) Determine the initial mold opening anti-collision compensation allowance of the slider in the deep drawing equipment based on the depth of the pelvic part 1 and the upper limit displacement difference;

[0010] Step 4) Determine the initial anti-collision compensation allowance for the outer slider of the deep drawing equipment based on the depth of the pelvic part 1 and the lower limit displacement difference;

[0011] Step 5) Based on the initial mold opening anti-collision compensation allowance, the initial inner slider speed, and the initial outer slider speed, control the upper mold assembly 6 and the lower mold assembly 4 to rise for mold opening, and keep the displacement difference between the inner slider and the outer slider less than the upper limit displacement difference during the rising process. If the mold opening is abnormal, increase the initial mold opening anti-collision compensation allowance of the inner slider or reduce the rising speed of the outer slider until the mold opening is normal. Use the corrected mold opening anti-collision compensation allowance, the corrected outer slider speed, and the initial inner slider speed at this time as the preset mold opening action formula parameters.

[0012] Step 6) Based on the initial mold closing anti-collision compensation allowance, the initial inner slider speed, and the corrected outer slider speed in Step 5), control the upper mold assembly 6 and the lower mold assembly 4 to descend and close the mold. During the descent, maintain the displacement difference between the inner and outer sliders greater than the lower limit displacement difference. If the mold closing is abnormal, increase the initial mold closing anti-collision compensation allowance or decrease the descent speed of the inner slider until the mold closing is normal. Use the corrected mold closing anti-collision compensation allowance, the corrected inner slider speed, and the corrected outer slider speed in Step 5) as the preset mold closing action formula parameters.

[0013] Step 7) Call the preset mold opening action formula parameters in Step 5) and the preset mold closing action formula parameters in Step 6) to activate the deep drawing equipment alarm system, so that the pressing component 5 and the upper die component 6 can repeatedly and normally complete the mold opening and closing actions under the no-load test run under the control of the deep drawing equipment program, and form the initial action formula parameters for the entire process of mold opening and closing.

[0014] Step 8): Based on the initial action formula parameters of the whole process in Step 7), increase the lower limit displacement difference of the action in Step 1) and decrease the upper limit displacement difference of the action in Step 2); repeat the process from Step 3) to Step 7) so that the pressing component 5 and the upper mold component 6 can complete the mold opening and closing actions normally again, forming the final action formula parameters of the whole process.

[0015] Among them, the large deep basin part double-acting drawing die includes: lower die assembly 4, blank holder assembly 5, and upper die assembly 6;

[0016] The lower die assembly 4 is fixed on the worktable of the deep drawing equipment;

[0017] The upper surface of the pressing component 5 is fixedly connected to the outer slider of the deep drawing equipment. A large through hole 13 is provided in the center of the pressing component 5, and a limit guide groove 21 is provided on the inner wall of the large through hole 13.

[0018] The upper die assembly 6 includes an upper die base 14 and an upper die seat 15. The upper end of the upper die seat 15 is provided with a wider upper die adapter plate 16. The upper surface of the upper die adapter plate 16 is fixedly connected to the inner slider of the deep drawing equipment. The lower surface of the upper die seat 15 is fixedly connected to the upper die base 14. The size of the working surface 17 of the upper die base 14 matches the inner surface size of the large deep basin part 1 and is larger than the inner contour size of the outer slider of the deep drawing equipment. A guide boss 22 matching the limiting guide groove 21 of the pressing component 5 is provided above the upper die base 14. The limiting guide groove 21 is used to limit the downward movement distance of the upper die assembly 6 relative to the pressing component 5.

[0019] Optionally, the lower mold assembly 4 includes: a lower mold base 7 and a lower mold adapter plate 8;

[0020] The width of the upper surface of the lower die base 7 is greater than the width of the lower surface and the worktable of the deep drawing equipment. The middle of the upper surface is provided with a recessed working surface 9 that matches the annular sidewall 3 and the lower surface of the basin bottom of the large deep basin part 1. The outer side of the recessed working surface 9 is provided with an annular pressing surface 10 that matches the lower surface of the flange edge 2 of the basin part 1. The lower die adapter plate 8 is provided on the lower surface of the lower die base 7 and is used to connect the worktable of the deep drawing equipment.

[0021] Optionally, the pressing assembly 5 includes: a pressing base 11 and a pressing adapter plate 12;

[0022] The upper surface of the pressing base 11 is narrower than the lower surface, and the width of the lower surface is wider than the outer contour width of the outer slider of the deep drawing equipment. The lower surface is provided with an annular pressing surface 10 corresponding to the upper surface of the lower die base 7. The pressing adapter plate 12 is connected to the top surface of the pressing base 11 and is used to connect the outer slider of the deep drawing equipment.

[0023] Optionally, the lower mold base 7 and the pressing base 11 are provided with matching semi-circular bosses 18 on the outer edge of the annular pressing surface 10, and guide posts 19 are provided on the semi-circular bosses 18 of the lower mold base 7, and guide holes 20 matching the guide posts 19 are provided on the semi-circular bosses 18 of the pressing base 11.

[0024] Optionally, the total height of the upper mold assembly 6 is greater than the sum of the thickness of the pressing edge assembly 5 and the depth of the pelvic component 1, the length of the guide boss 22 is greater than the depth of the pelvic component 1, and the length of the limiting guide groove 21 is greater than the sum of the length of the guide boss 22 of the upper mold base 14 and the depth of the pelvic component 1.

[0025] Optionally, the width of the lower die adapter plate 8 is less than or equal to the width of the deep drawing equipment worktable;

[0026] The width of the pressing plate 12 is less than or equal to the width of the outer slider of the drawing equipment;

[0027] The length and width of the upper die adapter plate 16 are less than the length and width of the slider inside the deep drawing equipment.

[0028] Optionally, the method for obtaining the intelligent alternating deep drawing formula for the large deep-pelvis part dual-action deep drawing die includes:

[0029] During the deep drawing process, the sheet metal is placed above the lower die assembly. Following the final die closing action parameters in step 8), the outer slider is moved first to lower the blank holder assembly 5, and then the inner slider is moved to lower the upper die assembly 6. The blank holder assembly 5 and the upper die assembly 6 are moved alternately and repeatedly until the blank holder assembly 5 reaches the state of clamping the sheet metal, and the remaining stroke of the upper die assembly 6 is greater than the depth of the cavity part 1. The upper die assembly 6 continues to descend for deep drawing.

[0030] When unloading the mold, according to the final mold opening action formula parameters in step 8), the upper mold assembly 6 and the pressure component 5 are moved alternately and repeatedly in the order of first raising the inner slider to raise the upper mold assembly 6, and then raising the outer slider to raise the pressure component 5, so that the upper mold assembly 6 reaches the end displacement of the mold opening stroke first.

[0031] Optionally, the depth of the pelvic component 1 is less than or equal to the preset mold closing anti-collision compensation displacement of the pressure edge component 5 and less than or equal to the preset mold opening anti-collision compensation displacement of the upper mold component 6.

[0032] Optionally, the sum of the mold closing compensation displacement of the pressing component 5 and the depth of the basin component 1 is less than or equal to the difference in height between the guide boss 22 of the upper mold component 6 and the top surface of the pressing transition plate 12 of the pressing component 5 in the mold closing state.

[0033] The difference between the mold opening displacement of the upper mold assembly 6 and the depth of the cavity component 1 is greater than or equal to the difference in top surface height between the upper mold adapter plate 16 of the upper mold assembly 6 and the pressing edge adapter plate 12 of the pressing edge assembly 5 in the mold closing state.

[0034] Optionally, during the mold closing and drawing process and the mold opening and unloading process, the preset speeds for the descent and ascent of the blank holder component 5 are kept consistent, and the preset speeds for the descent and ascent of the upper mold component 6 are also kept consistent; the blank holder component 5 and the upper mold component 6 are allowed to have independent speed differences.

[0035] The beneficial effects of this application are:

[0036] 1) This application solves the problem of mold assembly on the table of ultra-large equipment by adopting a transfer connection method; it can expand the processing capacity of deep-cavity circular parts of existing equipment from the 1.4-meter level to over 2.8 meters; 2) This application adopts both built-in and external guide mechanisms to realize the indirect guide force transmission between ultra-large mold components, solving the design problem of stable operation mechanism for ultra-large molds; 3) This application uses CNC program control to alternately wait or move between mold components, overcoming the problem of speed deviation caused by pressure response lag due to independent hydraulic transmission of the inner and outer sliders caused by the ultra-large upper mold component, which leads to work interference. Therefore, the mold structure and alternating drawing method adopted in this application can not only overcome the problem of existing large deep-cavity basin-shaped parts equipment being limited by the table, restricting the realization of the double-action drawing principle of large molds; but also further explore the practical application potential of double-action drawing of large drawing equipment, and the technical principle can also be extended to the integral forming of ultra-long and ultra-wide parts. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0038] Figure 1 This is a schematic diagram of the shape of the pelvic component in this application;

[0039] Figure 2 This is a schematic diagram of the assembly structure of the double-action deep drawing die of this application;

[0040] Figure 3 This is a schematic diagram of the top view of the lower die assembly of the double-action deep drawing die in this application;

[0041] Figure 4 This is a bottom view structural diagram of the lower die assembly of the double-action deep drawing die in this application;

[0042] Figure 5 This is a schematic diagram of the double-action drawing die blank holder assembly of this application from a plan view.

[0043] Figure 6 This is a top view of the upper die assembly of the double-action deep drawing die in this application;

[0044] Figure 7 This is a bottom view of the upper die base structure of the double-acting deep drawing die upper die assembly of this application;

[0045] Figure 8 This application Figure 2 A schematic diagram of the cross-sectional structure of a double-action deep drawing die;

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Basin component; 2. Flange edge; 3. Annular sidewall; 4. Lower mold assembly; 5. Blanket assembly; 6. Upper mold assembly; 7. Lower mold base; 8. Lower mold adapter plate; 9. Recessed working surface; 10. Annular blanket surface; 11. Blanket base; 12. Blanket adapter plate; 13. Large through hole; 14. Upper mold base; 15. Upper mold seat; 16. Upper mold adapter plate; 17. Working surface; 18. Semi-circular boss; 19. Guide post; 20. Guide hole; 21. Limiting guide groove; 22. Guide boss. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0049] First, we will introduce the technical defects of traditional ultra-large deep drawing dies in double-action deep drawing.

[0050] See attached document Figure 1The approximately circular, ultra-large deep basin component 1, containing a flange edge 2 and an annular sidewall 3, is one of the typical parts applicable to this application. The diameter of the annular sidewall 3 of this basin component 1 is greater than 2.0 meters, and the required unfolded diameter is approximately 3.1 meters. Currently, the internal slider size of large mainstream deep drawing equipment in China is only 1.4 meters x 1.65 meters, and the effective size of the worktable and external slider is 1.96 meters x 3.3 meters. Traditional double-action deep drawing requires the circular working surface 17 of the upper die assembly 6 to be embedded inside the external slider to achieve its operating principle. For the upper die base 14, if the length is greater than 1.65 meters or the width is greater than 1.4 meters, there is a risk of rigid collision between the upper die assembly 6 and the external slider. For the lower die base 7 and the blank holder base 11, if the width is greater than 1.96 meters, the die exceeds the effective clamping width range of the equipment. Due to limitations in the operating principle and equipment structure of double-action deep drawing equipment, conventional mold structures cannot fully realize the potential of double-action deep drawing equipment to form larger parts. This is especially true when the forming blank is a nearly circular deep-cavity part with a diameter of 3 meters. Not only do the lower mold assembly 4, the blank holder assembly 5, and the upper mold assembly 6 all far exceed the maximum width limits of the equipment's worktable, outer slide, and inner slide, but there are also issues with rigid collisions between the mold and the equipment, and between the mold components themselves. Manually controlling the alternating up and down movement of the upper mold assembly 6 and the lower mold assembly 4 during the mold opening and closing process is extremely difficult and carries a high degree of risk.

[0051] See attached document Figure 2-8 To address the challenges posed by the large length and width of the drawing die for large pelvic parts, the high difficulty and safety risks associated with the repeated alternating movement of the die components during manual double-action drawing, this application utilizes intelligent equipment to obtain the intelligent alternating drawing formula. The main steps are as follows:

[0052] A method for obtaining intelligent alternating deep drawing formula for a large deep-pelvis component using a dual-action deep drawing die, as shown in the appendix. Figure 2 Appendix Figure 8 The method includes:

[0053] Step 1) Based on the height difference between the top surfaces of the upper mold adapter plate 16 and the pressure plate adapter plate 12 in the mold closing state, determine the lower limit displacement difference of the movement process of the outer and inner sliders of the deep drawing equipment.

[0054] Step 2) Based on the height difference between the top surface of the pressure plate 12 and the guide boss 22 of the upper mold base 14 in the mold closing state, determine the upper limit displacement difference of the outer and inner sliders during the movement process of the deep drawing equipment.

[0055] Step 3) Determine the initial mold opening anti-collision compensation allowance of the slider in the deep drawing equipment based on the depth of the pelvic part 1 and the upper limit displacement difference.

[0056] Step 4) Determine the initial anti-collision compensation allowance of the outer slider of the deep drawing equipment based on the depth of the pelvic part 1 and the lower limit displacement difference.

[0057] Step 5) Based on the initial mold opening anti-collision compensation allowance, the initial inner slider speed, and the initial outer slider speed, control the upper mold assembly 6 and the lower mold assembly 4 to rise for mold opening, and keep the displacement difference between the inner slider and the outer slider less than the upper limit displacement difference during the rising process. If the mold opening is abnormal, increase the initial mold opening anti-collision compensation allowance of the inner slider or reduce the rising speed of the outer slider until the mold opening is normal. Use the corrected mold opening anti-collision compensation allowance, the corrected outer slider speed, and the initial inner slider speed at this time as the preset mold opening action formula parameters.

[0058] Step 6) Based on the initial mold closing anti-collision compensation allowance, the initial inner slider speed, and the corrected outer slider speed in Step 5), control the upper mold assembly 6 and the lower mold assembly 4 to descend and close the mold. During the descent, maintain the displacement difference between the inner and outer sliders greater than the lower limit displacement difference. If the mold closing is abnormal, increase the initial mold closing anti-collision compensation allowance or decrease the descent speed of the inner slider until the mold closing is normal. Use the corrected mold closing anti-collision compensation allowance, the corrected inner slider speed, and the corrected outer slider speed in Step 5) as the preset mold closing action formula parameters.

[0059] Step 7) Call the preset mold opening action formula parameters in Step 5) and the preset mold closing action formula parameters in Step 6) to activate the deep drawing equipment alarm system, so that the pressing component 5 and the upper die component 6 can repeatedly and normally complete the mold opening and closing actions under the no-load test run under the control of the deep drawing equipment program, and form the initial action formula parameters for the entire mold opening and closing process.

[0060] Step 8): Based on the initial action formula parameters of the whole process in Step 7), increase the lower limit displacement difference of the action in Step 1) and decrease the upper limit displacement difference of the action in Step 2); repeat the process from Step 3) to Step 7) so that the pressing component 5 and the upper mold component 6 can complete the mold opening and closing actions normally again, forming the final action formula parameters of the whole process.

[0061] Further, refer to the appendix Figure 2-8 In order to achieve the above-mentioned objective, the double-acting drawing die of the present invention shall at least have the following conditions: the drawing die includes a lower die assembly 4, a blank holder assembly 5, and an upper die assembly 6.

[0062] The lower die assembly 4 is fixed on the worktable of the deep drawing equipment;

[0063] The upper surface of the pressing component 5 is fixedly connected to the outer slider of the deep drawing equipment. A large through hole 13 is provided in the center of the pressing component 5, and a limit guide groove 21 is provided on the inner wall of the large through hole 13.

[0064] The upper die assembly 6 includes an upper die base 14 and an upper die seat 15. The upper end of the upper die seat 15 is provided with a wider upper die adapter plate 16. The upper surface of the upper die adapter plate 16 is fixedly connected to the inner slider of the deep drawing equipment. The lower surface of the upper die seat 15 is fixedly connected to the upper die base 14. The size of the working surface 17 of the upper die base 14 matches the inner surface size of the large deep basin part 1 and is larger than the inner contour size of the outer slider of the deep drawing equipment. A guide boss 22 matching the limiting guide groove 21 of the pressing component 5 is provided above the upper die base 14. The limiting guide groove 21 is used to limit the downward movement distance of the upper die assembly 6 relative to the pressing component 5.

[0065] As a further embodiment of the deep drawing die of the present invention, refer to the appendix. Figure 2-4 The lower die assembly 4 includes a lower die base 7 and a lower die adapter plate 8. The upper surface of the lower die base 7 is wider than the lower surface and the width of the drawing equipment worktable. A recessed working surface 9, matching the annular sidewall 3 and the lower surface of the basin bottom of the large deep basin component 1, is provided in the middle of the upper surface. An annular pressing surface 10, matching the lower surface of the flange edge 2 of the basin component 1, is provided on the outer side of the recessed working surface 9. The lower die adapter plate 8 is located on the lower surface of the lower die base 7 and is used to connect to the drawing equipment worktable. Its main purpose is to solve the problem of the lower die assembly 4 being too large and affecting the installation of the equipment worktable through an adapter method.

[0066] As a further embodiment of the deep drawing die of the present invention, refer to the appendix. Figure 2 Appendix Figure 5 The pressing assembly 5 includes a pressing base 11 and a pressing adapter plate 12. The upper surface of the pressing base 11 is narrower than the lower surface, and the lower surface is wider than the outer contour width of the outer slider of the deep drawing equipment. The lower surface has an annular pressing surface 10 corresponding to the upper surface of the lower die base 7. The pressing adapter plate 12 is connected to the top surface of the pressing base 11 and is used to connect the outer slider of the deep drawing equipment. Its main purpose is to solve the problem of the pressing assembly 5 being too large and affecting the installation of the outer slider of the equipment through the adapter method.

[0067] As a further embodiment of the deep drawing die of the present invention, refer to the appendix. Figure 2-5 The lower die base 7 and the pressing edge base 11 are provided with matching semi-circular bosses 18 on the outer edge of the annular pressing edge surface 10. Guide posts 19 are provided on the semi-circular bosses 18 of the lower die base 7, and guide holes 20 matching the guide posts 19 are provided on the semi-circular bosses 18 of the pressing edge base 11. The main purpose is to automatically match the positional relationship between the lower die assembly 4 and the pressing edge assembly 5 through guidance, avoiding misalignment due to relative rotation between the approximately circular components.

[0068] As a further embodiment of the deep drawing die of the present invention, refer to the appendix. Figure 2 Appendix Figure 8The total height of the upper mold assembly 6 is greater than the sum of the thickness of the pressure plate assembly 5 and the depth of the basin component 1. The length of the guide boss 22 is greater than the depth of the basin component 1. The length of the limiting guide groove 21 is greater than the sum of the length of the guide boss 22 and the depth of the basin component 1 on the upper mold base 14. Its main purpose is to solve the risk of rigid collision during mold opening and closing because the upper mold assembly 6 is larger than the inner hole contour of the outer slider. At the same time, it avoids the risk of mold being overloaded due to exceeding the platform surface, while leaving sufficient coordinated movement stroke.

[0069] As a further embodiment of the deep drawing die of the present invention, refer to the appendix. Figure 2-8 The width of the lower die adapter plate 8 is less than or equal to the width of the drawing equipment's worktable; the width of the pressing edge adapter plate 12 is less than or equal to the width of the outer slider of the drawing equipment; and the length and width of the upper die adapter plate 16 are less than the length and width of the inner slider of the drawing equipment. Its main purpose is to ensure smooth die installation even when any part of the die is much larger than the corresponding part of the equipment, solving the problem of installing ultra-large dies through an adapter method.

[0070] As a further embodiment of the deep drawing formulation of the present invention, refer to the appendix. Figure 8 To avoid operational errors caused by repeated alternating movement of mold components, and to simplify operation by fully utilizing the equipment's CNC commands and early warning system, the method for obtaining the intelligent alternating deep drawing formula for the large deep-cavity part dual-action deep drawing die includes:

[0071] During the deep drawing process, the sheet metal is placed above the lower die assembly. Following the final die closing action parameters in step 8), the outer slider is moved first to lower the blank holder assembly 5, and then the inner slider is moved to lower the upper die assembly 6. The blank holder assembly 5 and the upper die assembly 6 are moved alternately and repeatedly until the blank holder assembly 5 reaches the state of clamping the sheet metal, and the remaining stroke of the upper die assembly 6 is greater than the depth of the cavity part 1. The upper die assembly 6 continues to descend for deep drawing.

[0072] When unloading the mold, according to the final mold opening action formula parameters in step 8), the upper mold assembly 6 and the pressure component 5 are moved alternately and repeatedly in the order of first raising the inner slider to raise the upper mold assembly 6, and then raising the outer slider to raise the pressure component 5, so that the upper mold assembly 6 reaches the end displacement of the mold opening stroke first.

[0073] As a further embodiment of the deep drawing formula of the present invention, the depth of the pelvic component 1 is less than or equal to the preset mold closing anti-collision compensation displacement of the pressing component 5 and less than or equal to the preset mold opening anti-collision compensation displacement of the upper mold component 6.

[0074] As a further embodiment of the deep drawing formula of the present invention, the sum of the mold closing compensation displacement of the pressing component 5 and the depth of the basin component 1 is less than or equal to the difference in height between the guide boss 22 of the upper mold component 6 and the top surface of the pressing transition plate 12 of the pressing component 5 in the mold closing state; the difference between the mold opening compensation displacement of the upper mold component 6 and the depth of the basin component 1 is greater than or equal to the difference in height between the upper mold transition plate 16 of the upper mold component 6 and the top surface of the pressing transition plate 12 of the pressing component 5 in the mold closing state.

[0075] As a further embodiment of the deep drawing formula of the present invention, in order to avoid the contradiction between eliminating the alarms of mold closing and mold opening, the preset speeds of the descent and ascent of the blank holder component 5 are kept consistent during the mold closing deep drawing and mold opening unloading processes, and the preset speeds of the descent and ascent of the upper mold component 6 are also kept consistent during the mold closing deep drawing and mold opening unloading processes; the blank holder component 5 and the upper mold component 6 are allowed to have independent movement speed differences.

[0076] Thus, the present invention achieves its purpose of preventing rigid collisions between ultra-large mold components and equipment components, as well as between the mold components themselves, by relying on mold structure design and intelligent control program.

Claims

1. A method for obtaining the formula for intelligent alternating deep drawing using a dual-action deep drawing die for large deep-cavity parts, characterized in that, The method includes: Step 1) Based on the height difference between the top surfaces of the upper mold adapter plate (16) and the pressure plate adapter plate (12) in the mold closing state, determine the lower limit displacement difference of the outer and inner sliders during the movement process of the deep drawing equipment; Step 2) Based on the height difference between the top surface of the pressure plate (12) and the guide boss (22) of the upper mold base (14) in the mold closing state, determine the upper limit displacement difference of the outer and inner sliders during the movement process of the deep drawing equipment; Step 3) Determine the initial mold opening anti-collision compensation allowance of the slider in the deep drawing equipment based on the depth of the pelvic part (1) and the upper limit displacement difference; Step 4) Determine the initial anti-collision compensation allowance of the outer slider of the deep drawing equipment based on the depth of the pelvic part (1) and the lower limit displacement difference; Step 5) Based on the initial mold opening anti-collision compensation allowance, the initial inner slider speed, and the initial outer slider speed, control the upper mold assembly (6) and the lower mold assembly (4) to rise for mold opening, and keep the displacement difference between the inner slider and the outer slider less than the upper limit displacement difference during the rising process. If the mold opening is abnormal, increase the initial mold opening anti-collision compensation allowance of the inner slider or reduce the rising speed of the outer slider until the mold opening is normal. Use the corrected mold opening anti-collision compensation allowance, the corrected outer slider speed, and the initial inner slider speed at this time as the preset mold opening action formula parameters. Step 6) Based on the initial mold closing anti-collision compensation allowance, the initial inner slider speed, and the corrected outer slider speed in Step 5), control the upper mold assembly (6) and the lower mold assembly (4) to descend and close the mold. During the descent, keep the displacement difference between the inner slider and the outer slider greater than the lower limit displacement difference. If the mold closing is abnormal, increase the initial mold closing anti-collision compensation allowance or decrease the descent speed of the inner slider until the mold closing is normal. Use the corrected mold closing anti-collision compensation allowance, the corrected inner slider speed, and the corrected outer slider speed in Step 5) as the preset mold closing action formula parameters. Step 7), call the preset mold opening action formula parameters in Step 5) and the preset mold closing action formula parameters in Step 6), turn on the deep drawing equipment alarm system, so that the pressing component (5) and the upper mold component (6) can repeatedly and normally complete the mold opening and closing actions under the no-load test run under the control of the deep drawing equipment program, and form the initial action formula parameters for the entire process of mold opening and closing. Step 8), based on the initial action formula parameters of the whole process in Step 7), increase the lower limit displacement difference of the action in Step 1) and decrease the upper limit displacement difference of the action in Step 2); repeat the process from Step 3) to Step 7) so that the pressing component (5) and the upper mold component (6) can complete the mold opening and closing actions normally again, forming the final action formula parameters of the whole process; Among them, the large deep basin part double-acting drawing die includes: lower die assembly (4), edge pressing assembly (5), and upper die assembly (6); The lower die assembly (4) is fixed on the worktable of the deep drawing equipment; The upper surface of the pressing component (5) is fixedly connected to the outer slider of the deep drawing equipment. A large through hole (13) is provided in the center of the pressing component (5), and a limit guide groove (21) is provided on the inner wall of the large through hole (13). The upper die assembly (6) includes: an upper die base (14) and an upper die seat (15); the upper end of the upper die seat (15) is provided with a wider upper die adapter plate (16), the upper surface of the upper die adapter plate (16) is fixedly connected to the inner slider of the deep drawing equipment, the lower surface of the upper die seat (15) is fixedly connected to the upper die base (14), the size of the working surface (17) of the upper die base (14) matches the inner surface size of the large deep basin part (1) and is larger than the inner contour size of the outer slider of the deep drawing equipment, and a guide boss (22) matching the limiting guide groove (21) of the pressing assembly (5) is provided above the upper die base (14), the limiting guide groove (21) is used to limit the downward movement distance of the upper die assembly (6) relative to the pressing assembly (5); The pressing assembly (5) includes: a pressing base (11) and a pressing adapter plate (12); The upper surface of the pressing base (11) is narrower than the lower surface, and the width of the lower surface is wider than the outer contour width of the outer slider of the deep drawing equipment. The lower surface is provided with an annular pressing surface corresponding to the upper surface of the lower die base (7). The pressing adapter plate (12) is connected to the top surface of the pressing base (11) and is used to connect the outer slider of the deep drawing equipment.

2. The method for obtaining the intelligent alternating deep drawing formula of a large deep-pelvis component using a dual-action deep drawing die as described in claim 1, characterized in that, The lower mold assembly (4) includes: a lower mold base (7) and a lower mold adapter plate (8); The upper surface of the lower die base (7) is wider than the lower surface and the width of the drawing equipment worktable. The middle of the upper surface is provided with a recessed working surface (9) that matches the annular sidewall (3) of the large deep basin part (1) and the lower surface of the basin bottom. The outer side of the recessed working surface (9) is provided with an annular pressing surface that matches the lower surface of the flange edge (2) of the basin part (1). The lower die adapter plate (8) is set on the lower surface of the lower die base (7) and is used to connect the drawing equipment worktable.

3. The method for obtaining the intelligent alternating deep drawing formula of a large deep-pelvis component using a dual-action deep drawing die as described in claim 2, characterized in that... The lower die base (7) and the pressing base (11) are provided with matching semi-circular bosses (18) on the outer edge of the annular pressing surface. A guide post (19) is provided on the semi-circular boss (18) of the lower die base (7), and a guide hole (20) matching the guide post (19) is provided on the semi-circular boss (18) of the pressing base (11).

4. The method for obtaining the intelligent alternating deep drawing formula of a double-action deep drawing die for large deep-pelvic parts according to claim 1, characterized in that, The total height of the upper mold assembly (6) is greater than the sum of the thickness of the pressing edge assembly (5) and the depth of the pelvic part (1), the length of the guide boss (22) is greater than the depth of the pelvic part (1), and the length of the limiting guide groove (21) is greater than the sum of the length of the guide boss (22) of the upper mold base (14) and the depth of the pelvic part (1).

5. The method for obtaining the intelligent alternating deep drawing formula of a large deep-pelvis component using a dual-action deep drawing die as described in claim 2, characterized in that, The width of the lower die adapter plate (8) is less than or equal to the width of the deep drawing equipment worktable; The width of the pressing transition plate (12) is less than or equal to the width of the outer slider of the deep drawing equipment.

6. The method for obtaining the intelligent alternating deep drawing formula of a large deep-pelvis component using a dual-action deep drawing die as described in claim 2, characterized in that, The method includes: When the die is closed and the sheet metal is drawn, the sheet metal is placed above the lower die assembly. According to the final die closing action formula parameters in step 8), the outer slider is moved first to lower the blank holder assembly (5), and then the inner slider is moved to lower the upper die assembly (6). The blank holder assembly (5) and the upper die assembly (6) are moved alternately and repeatedly until the blank holder assembly (5) reaches the state of closing and pressing the sheet metal. When this state is reached, the remaining stroke of the upper die assembly (6) is greater than the depth of the basin part (1). The upper die assembly is then lowered to continue the drawing process. When unloading the mold, according to the final mold opening action formula parameters in step 8), the upper mold assembly (6) and the pressure component (5) are moved alternately and repeatedly in the order of first raising the inner slider to raise the upper mold assembly, and then raising the outer slider to raise the pressure component (5), so that the upper mold assembly (6) reaches the end displacement of the mold opening stroke first.

7. The method for obtaining the intelligent alternating deep drawing formula of a large deep-pelvis component with a dual-action deep drawing die according to claim 6, characterized in that, The depth of the pelvic component (1) is less than or equal to the preset mold closing anti-collision compensation allowance of the pressing component (5) and the preset mold opening anti-collision compensation allowance of the upper mold component (6).

8. The method for obtaining the intelligent alternating deep drawing formula of a large deep-pelvis component with a dual-action deep drawing die according to claim 7, characterized in that, The sum of the pre-set anti-collision compensation allowance of the pressing component (5) and the depth of the basin component (1) is less than or equal to the difference in height between the guide boss (22) of the upper mold component (6) and the top surface of the pressing transition plate (12) of the pressing component (5) in the mold closing state. The difference between the pre-set anti-collision compensation allowance of the upper mold assembly (6) and the depth difference of the basin part (1) is greater than or equal to the difference in top surface height between the upper mold adapter plate (16) of the upper mold assembly (6) and the pressing edge adapter plate (12) of the pressing edge assembly (5) in the mold closing state.

9. The method for obtaining the intelligent alternating deep drawing formula of a large deep-cavity part with a dual-action deep drawing die according to any one of claims 1-8, characterized in that, During the mold closing and drawing process and the mold opening and unloading process, the preset speeds of the descent and ascent of the edge pressing component (5) are kept consistent, and the preset speeds of the descent and ascent of the upper mold component (6) are also kept consistent during the mold closing and drawing process and the mold opening and unloading process. The pressing component (5) and the upper die component (6) are allowed to have independent motion speed differences.

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