Method for acquiring intelligent alternate drawing formula of double-acting drawing die for large-scale deep-pot cavity component

Abstract

The invention provides an intelligent alternate drawing formula obtaining method for a double-acting drawing die of a large deep basin cavity part. A lower die assembly, an edge pressing assembly and an upper die assembly of the drawing die obviously comprise movement interference parts larger than a workbench, an outer sliding block and an inner sliding block of drawing equipment respectively. By designing the lower die assembly, the blank pressing assembly and the upper die assembly of a non-uniform-section combined structure of the upper and lower surface outlines, the die-filling problem of an oversized deep drawing die and equipment is solved; by designing an external guide mechanism and an internal guide mechanism, the guide stroke is reasonably matched, and indirect guide transmission is adopted to solve the problem of reliable operation of the super-large deep drawing die; an intelligent action parameter formula is set according to the geometric height relation between mold parts, and the limit displacement difference between the mold parts is controlled to avoid movement rigid collision between the mold and equipment and between the mold parts. According to the technology, the machining potential of existing double-acting deep drawing equipment can be brought into full play, overall forming of the ultra-long and ultra-wide large deep-cavity thin shell part is achieved, and particularly the forming width limit can be increased to two times of the forming width limit in the prior art.

Description

Technical Field

[0001] The invention relates to a sheet metal manufacturing technology in the field of aircraft manufacturing, in particular to a method for obtaining an intelligent alternating drawing formula of a double-action drawing die for a large deep basin part. Background Art

[0002] As the requirements for service life and aerodynamic characteristics of new aircraft continue to increase, the integrated forming of large sheet metal parts will significantly reduce the deformation caused by welding or riveting. It can not only make the structure lighter, but also significantly improve the assembly coordination accuracy and efficiency. Therefore, the integrated forming of ultra-large thin-walled parts is becoming more and more important in aircraft applications.

[0003] As is known, deep drawing is one of the methods suitable for forming large-depth parts in the field of plastic processing. The main mold structures that can be selected are single-action drawing die and double-action drawing die. Among them, single-action deep drawing relies on the push rods around the punch to provide the blanking force. In order to ensure that the blanking force around the parts is uniform, the maximum width of the blanking force that can be provided by single-action deep drawing in large-scale mainstream domestic drawing equipment is only 1.6 meters. Therefore, the maximum diameter can only be formed into 1.4 meters and less than 0.1 meters deep cavity parts. As the depth of the forming requirement increases, the maximum formable diameter will be further reduced. Double-action deep drawing relies on the outer slider of the equipment to provide the blanking force. It is suitable for installing super-large molds with the blanking ring and the die close to the full table surface; however, the double-action principle requires the upper mold to be embedded in the outer slider with the inner slider. At present, the workbench and outer slider of large-scale mainstream domestic drawing equipment are effectively 1.96 meters x 3.3 meters in size, and the inner slider is only 1.4 meters x 1.65 meters in size. Limited by the double-action deep drawing principle and equipment structure, conventional mold structures cannot give full play to the potential of double-action deep drawing equipment to form larger parts, especially large and medium-sized aircraft engine air inlets, engine tail nozzle skins, etc., which are all irregular circles. The overall required blank is about 3.1 meters in diameter, which not only far exceeds the maximum length and width of the equipment workbench mold, but also the effective forming surface width is twice that of the inner slider.

[0004] The essence of alternating deep drawing is to prevent rigid collisions between the mold and the equipment, and between the mold's own parts from many aspects, such as controlling the order of mold component movements, matching component movement speeds, and monitoring the displacement differences of equipment components. Therefore, alternating function deep drawing molds not only meet the basic requirements of conventional molds, but also need to consider many factors, such as the interference between components and the difference in independent movement rates of the inner and outer slides of the equipment. It is one of the urgent engineering application problems that restrict the lightweight overall forming of larger and more complex three-dimensional parts in the plastic industry. Summary of the invention

[0005] The present invention provides a method for obtaining an intelligent alternating drawing formula for a double-action drawing die for large deep-cavity parts, in order to overcome the problem that the existing drawing dies and forming methods are limited by the double-action drawing action principle and equipment structure, and cannot give full play to the potential of double-action drawing equipment to form larger parts, especially the problem of forming ultra-large cavity pelvic parts and ultra-long and wide deep-cavity parts as a whole. The present invention designs a combined structural mold component, and matches the geometric and motion relationship between the mold components and the mold and the equipment; combined with the equipment CNC instructions and early warning system, the equipment components are controlled to maintain coordinated actions within a reasonable displacement difference range, autonomously coordinate the displacement relationship, and prevent rigid collision drawing.

[0006] The present invention provides a method for obtaining an intelligent alternating drawing formula of a double-action drawing die for a large deep basin cavity part, which mainly comprises the following steps:

[0007] Step 1) determining the lower limit displacement difference of the outer slider and the inner slider of the drawing equipment during the movement process according to the height difference between the top surfaces of the upper die adapter plate 16 and the edge clamp adapter plate 12 in the mold closing state;

[0008] Step 2) determining the upper limit displacement difference of the movement process of the outer slider and the inner slider of the drawing equipment according to the height difference between the top surface of the edge clamping adapter plate 12 and the guide boss 22 of the upper mold base 14 in the mold closing state;

[0009] Step 3) determining the anti-collision compensation margin of the initial mold opening of the slider in the drawing equipment according to the depth of the pelvic cavity part 1 and the upper limit displacement difference;

[0010] Step 4) determining the initial mold anti-collision compensation margin of the outer slide of the drawing equipment according to the depth of the pelvic cavity part 1 and the lower limit displacement difference;

[0011] Step 5) According to the initial mold opening anti-collision compensation margin, the initial inner slider speed, and the initial outer slider speed, the upper mold assembly 6 and the lower mold assembly 4 are controlled to rise for mold opening, and the displacement difference between the inner slider and the outer slider is kept less than the upper limit displacement difference during the rising process. When the mold opening is abnormal, the initial mold opening anti-collision compensation margin of the inner slider is increased or the rising speed of the outer slider is reduced until the mold opening is normal, and the corrected mold opening anti-collision compensation margin, the corrected outer slider speed, and the initial inner slider speed at this time are used as preset mold opening action formula parameters;

[0012] Step 6) According to the initial mold closing anti-collision compensation margin, the initial inner slider speed, and the corrected outer slider speed in step 5), the upper mold assembly 6 and the lower mold assembly 4 are controlled to descend for mold closing, and the displacement difference between the inner slider and the outer slider is kept greater than the lower limit displacement difference during the descent process. When the mold closing is abnormal, the initial mold closing anti-collision compensation margin is increased or the inner slider descending speed is reduced until the mold closing is normal, and the corrected mold closing anti-collision compensation margin, the corrected inner slider speed, and the corrected outer slider speed in step 5) are used as preset mold closing action formula parameters;

[0013] Step 7), calling the preset mold opening action formula parameters in step 5) and the preset mold closing action formula parameters in step 6), turning on the alarm system of the drawing equipment, so that the edge holding assembly 5 and the upper die assembly 6 can repeatedly and normally complete the mold opening and closing actions in the no-load test run under the control of the drawing equipment program, and form the initial action formula parameters of the whole 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 action lower limit displacement difference in step 1) and reduce the action upper limit displacement difference in step 2); repeat the process from step 3) to step 7), so that the edge holding assembly 5 and the upper mold assembly 6 can normally complete the mold opening and closing actions again, and form the final action formula parameters of the whole process;

[0015] Among them, the double-action drawing die for large deep basin parts includes: a lower die assembly 4, a side pressing assembly 5, and an upper die assembly 6;

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

[0017] The upper surface of the edge holding assembly 5 is fixedly connected to the outer slide block of the drawing device. A large through hole 13 is provided at the center of the edge holding assembly 5. A limited 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 an upper die adapter plate 16 with a larger width, the upper surface of the upper die adapter plate 16 is fixedly connected to the inner slider of the drawing equipment, and 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 cavity 1, and is larger than the inner contour size of the outer slider of the drawing equipment. A guide boss 22 matching the limiting guide groove 21 of the edge clamping assembly 5 is provided above the upper die base 14, and the limiting guide groove 21 is used to limit the downward movement distance of the upper die assembly 6 relative to the edge clamping assembly 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 workbench of the drawing equipment. A recessed working surface 9 is provided in the middle of the upper surface, which matches the annular side wall 3 and the lower surface of the basin bottom of the large deep basin component 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 component 1; the lower die adapter plate 8 is arranged on the lower surface of the lower die base 7 for connecting to the workbench of the drawing equipment.

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

[0022] The width of the upper surface of the edge holding base 11 is smaller than that of the lower surface, and the width of the lower surface is larger than the outer contour width of the outer slider of the drawing equipment. The lower surface is provided with an annular edge holding surface 10 corresponding to the upper surface of the lower mold base 7. The edge holding adapter plate 12 is connected to the top surface of the edge holding base 11 and is used to connect the outer slider of the drawing equipment.

[0023] Optionally, the lower mold base 7 and the edge pressing base 11 are provided with mutually matching semicircular bosses 18 on the outer edges of the annular edge pressing surface 10, a guide column 19 is provided on the semicircular boss 18 of the lower mold base 7, and a guide hole 20 matching the guide column 19 is provided on the semicircular boss 18 of the edge pressing base 11.

[0024] Optionally, the total height of the upper mold assembly 6 is greater than the sum of the thickness of the edge holding 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 ≤ the width of the workbench of the drawing equipment;

[0026] The width of the edge-pressing adapter plate 12 is less than or equal to the width of the outer slide 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 in the drawing device.

[0028] Optionally, the method for obtaining the intelligent alternating drawing formula of the double-action drawing die for a large deep basin cavity part includes:

[0029] During mold closing and deep drawing, the sheet is placed above the lower mold assembly, and according to the final mold closing action formula parameters in step 8), the outer slider is first moved to lower the edge clamp assembly 5, and then the inner slider is moved to lower the upper mold assembly 6, and the edge clamp assembly 5 and the upper mold assembly 6 are moved alternately and repeatedly, so that when the edge clamp assembly 5 reaches the mold closing state to clamp the sheet, the remaining stroke of the upper mold assembly 6 is greater than the depth of the basin cavity 1; the upper mold assembly 6 is continued to be lowered for deep drawing;

[0030] When the mold is opened and unloaded, according to the final mold opening action formula parameters in step 8), the upper mold assembly 6 and the edge holding assembly 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 edge holding assembly 5, so that the upper mold assembly 6 reaches the end displacement of the mold opening stroke first.

[0031] Optionally, the depth of the basin component 1 is ≤ the preset mold closing anti-collision compensation displacement of the edge holding assembly 5 ≤ the preset mold opening anti-collision compensation displacement of the upper mold assembly 6 .

[0032] Optionally, the sum of the mold closing compensation displacement of the edge clamping assembly 5 and the depth of the basin cavity 1 is ≤ the height difference between the guide boss 22 of the upper mold assembly 6 and the top surface of the edge clamping adapter plate 12 of the edge clamping assembly 5 in the mold closing state;

[0033] The difference between the mold opening compensation displacement of the upper mold assembly 6 and the depth of the pelvic cavity component 1 is ≥ the difference in top surface height between the upper mold adapter plate 16 of the upper mold assembly 6 and the edge clamping adapter plate 12 of the edge clamping assembly 5 in the mold closing state.

[0034] Optionally, during the process of mold closing and drawing and mold opening and unloading, the preset descending and ascending speeds of the edge clamping assembly 5 remain consistent, and during the process of mold closing and drawing and mold opening and unloading, the preset descending and ascending speeds of the upper mold assembly 6 also remain consistent; the edge clamping assembly 5 and the upper mold assembly 6 are allowed to have independent movement speed differences.

[0035] The beneficial effects of this application are:

[0036] 1) This application solves the problem of mold installation on super-large equipment tabletops by adopting a transfer connection method; the processing capacity of deep-cavity circular parts of existing equipment can be expanded from 1.4 meters to above 2.8 meters; 2) This application adopts both built-in guides and external guide mechanisms to realize indirect guide force transmission between super-large mold components, solving the problem of stable operation mechanism design for super-large mold working direction; 3) This application uses CNC programs to control the alternating waiting or movement between mold components, overcoming the problem of work interference caused by speed deviation due to the pressure response lag caused by independent hydraulic transmission of the inner and outer sliders due to the super-large upper mold component. Therefore, the mold structure and alternating drawing method adopted in this application can not only overcome the problem of existing large-scale deep-cavity basin-shaped parts equipment being restricted by the tabletop, which restricts 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-scale drawing equipment, and the technical principle can also be used for the overall forming of super-long and super-wide parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0038] Figure 1 It is a schematic diagram of the shape of the pelvic cavity member of the present application;

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

[0040] Figure 3 This is a schematic diagram of the plan view structure of the lower die assembly of the double-action drawing die of the present application;

[0041] Figure 4 This is a bottom view of the structure of the lower die assembly of the double-action drawing die of the present application;

[0042] Figure 5 This is a schematic diagram of the plan view structure of the double-action drawing die edge clamping assembly of the present application;

[0043] Figure 6 It is a schematic diagram of the top view of the upper die assembly of the double-action drawing die of the present application;

[0044] Figure 7 It is a bottom view structural diagram of the upper die base of the upper die assembly of the double-action drawing die of the present application;

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

[0046] Description of reference numerals:

[0047] 1. Basin part, 2. Flange edge, 3. Annular side wall, 4. Lower die assembly, 5. Edge pressing assembly, 6. Upper die assembly, 7. Lower die base, 8. Lower die adapter plate, 9. Recessed working surface, 10. Annular edge pressing surface, 11. Edge pressing base, 12. Edge pressing adapter plate, 13. Large through hole, 14. Upper die base, 15. Upper die seat, 16 Upper die adapter plate, 17. Working surface, 18. Semicircular boss, 19. Guide column, 20. Guide hole, 21. Limit guide groove, 22. Guide boss. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0049] Firstly, the technical defects of double-action deep drawing of traditional ultra-large deep drawing dies are introduced.

[0050] See attached Figure 1, a nearly circular super-large deep basin component 1 containing a flange 2 and an annular side wall 3 is one of the typical parts applicable to this application; the diameter of the annular side wall 3 of the basin component 1 is greater than 2.0 meters, and the required unfolded diameter is about 3.1 meters. At present, the size of the inner slider of large-scale mainstream deep drawing equipment in China is only 1.4 meters x 1.65 meters, and the effective size of the workbench and the outer slider is 1.96 meters x 3.3 meters. The traditional double-action deep drawing requires that the circular working surface 17 of the upper die assembly 6 be embedded in the interior of the outer slider to realize its action principle. For the upper die base 14 with a length greater than 1.65 meters or a width greater than 1.4 meters, there is a risk of rigid collision between the upper die assembly 6 and the outer slider. For the lower die base 7 and the edge pressing base 11 with a width greater than 1.96 meters, the mold exceeds the effective clamping width range of the equipment. Limited by the double-action deep drawing principle and equipment structure, conventional mold structures cannot give full play to the potential of double-action deep drawing equipment to form larger parts; especially when the forming blank is a nearly circular deep cavity with a diameter of 3 meters, not only the lower mold assembly 4, the edge pressing assembly 5, and the upper mold assembly 6 are far beyond the mold width limit of the equipment workbench, outer slide, and inner slide, but also there are problems of rigid collision between the mold and the equipment and the mold itself. It is extremely difficult and risky to rely on manual control of the upper mold assembly 6 and the lower mold assembly 4 to alternate up and down during the mold opening and closing process.

[0051] See attached Figure 2-8 In order to solve the problem that the drawing die of the large pelvic cavity part 1 is too long and wide, and the double-action deep drawing manual operation control movement repeatedly alternates the upper and lower mold parts, which is difficult and has a high safety risk, the main steps of this application using intelligent equipment to obtain the intelligent alternating deep drawing formula are as follows:

[0052] A method for obtaining an intelligent alternating drawing formula for a double-acting drawing die for a large deep pelvic cavity part, referring to the attached Figure 2 , Attachment Figure 8 , the method comprising:

[0053] Step 1) Determine the lower limit displacement difference of the outer slider and the inner slider of the drawing equipment during the movement process according to the height difference between the top surface of the upper die adapter plate 16 and the edge clamp adapter plate 12 in the mold closing state.

[0054] Step 2) Determine the upper limit displacement difference of the movement process of the outer slider and the inner slider of the drawing equipment according to the height difference between the top surface of the edge clamping adapter plate 12 and the guide boss 22 of the upper mold base 14 in the mold closing state.

[0055] Step 3) According to the depth of the pelvic component 1 and the upper limit displacement difference, determine the initial mold opening anti-collision compensation margin of the slider in the drawing equipment.

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

[0057] Step 5) According to the initial mold opening anti-collision compensation margin, 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. When the mold opening is abnormal, increase the initial mold opening anti-collision compensation margin of the inner slider or reduce the rising speed of the outer slider until the mold opening is normal. The corrected mold opening anti-collision compensation margin, corrected outer slider speed, and initial inner slider speed at this time are used as the preset mold opening action formula parameters.

[0058] Step 6) According to the initial mold closing anti-collision compensation margin, the initial inner slider speed, and the corrected outer slider speed in step 5), the upper mold assembly 6 and the lower mold assembly 4 are controlled to descend for mold closing, and the displacement difference between the inner slider and the outer slider is kept greater than the lower limit displacement difference during the descent process. When the mold closing is abnormal, the initial mold closing anti-collision compensation margin is increased or the inner slider descending speed is reduced until the mold closing is normal. The corrected mold closing anti-collision compensation margin, the corrected inner slider speed, and the corrected outer slider speed in step 5 are used as the preset mold closing action recipe 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), turn on the alarm system of the drawing equipment, and make the edge holding assembly 5 and the upper mold assembly 6 perform no-load trial operation under the control of the drawing equipment program to repeatedly complete the mold opening and mold closing actions normally, thereby forming the initial action formula parameters for the entire mold opening and mold closing process.

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

[0061] Further, see Attachment Figure 2-8 In order to achieve the above-mentioned purpose of the invention, the double-action drawing die of the present invention at least meets the following conditions: the drawing die comprises a lower die assembly 4, a side holding assembly 5, and an upper die assembly 6;

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

[0063] The upper surface of the edge holding assembly 5 is fixedly connected to the outer slide block of the drawing device. A large through hole 13 is provided at the center of the edge holding assembly 5. A limited 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 an upper die adapter plate 16 with a larger width, the upper surface of the upper die adapter plate 16 is fixedly connected to the inner slider of the drawing equipment, and 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 cavity 1, and is larger than the inner contour size of the outer slider of the drawing equipment. A guide boss 22 matching the limiting guide groove 21 of the edge clamping assembly 5 is provided above the upper die base 14, and the limiting guide groove 21 is used to limit the downward movement distance of the upper die assembly 6 relative to the edge clamping assembly 5.

[0065] As a further solution of the drawing die of the present invention, refer to the attached Figure 2-4 The lower die assembly 4 includes: a lower die base 7 and a lower die adapter plate 8; the width of the upper surface of the lower die base 7 is greater than the width of the lower surface and the workbench of the drawing equipment, and a concave working surface 9 is provided in the middle of the upper surface to match the annular side wall 3 and the lower surface of the basin bottom of the large deep basin cavity 1, and an annular pressure edge surface 10 is provided on the outer side of the concave working surface 9 to match the lower surface of the flange edge 2 of the basin cavity 1; the lower die adapter plate 8 is arranged on the lower surface of the lower die base 7, and is used to connect to the workbench of the drawing equipment. Its main purpose is to solve the problem of the lower die assembly 4 being too large to be installed on the equipment workbench through the transfer method.

[0066] As a further solution of the drawing die of the present invention, refer to the attached Figure 2 , Attachment Figure 5 The edge-holding assembly 5 includes: an edge-holding base 11 and an edge-holding adapter plate 12; the width of the upper surface of the edge-holding base 11 is smaller than that of the lower surface, and the width of the lower surface is larger than the outer contour width of the outer slider of the drawing equipment. The lower surface is provided with an annular edge-holding surface 10 corresponding to the upper surface of the lower die base 7, and the edge-holding adapter plate 12 is connected to the top surface of the edge-holding base 11 and is used to connect the outer slider of the drawing equipment. Its main purpose is to solve the problem of the edge-holding assembly 5 being too large to affect the installation of the outer slider of the equipment through the adapter method.

[0067] As a further solution of the drawing die of the present invention, refer to the attached Figure 2-5 The lower die base 7 and the blank holder base 11 are provided with mutually matching semicircular bosses 18 on the outer edge of the annular blank holder surface 10, a guide column 19 is provided on the semicircular boss 18 of the lower die base 7, and a guide hole 20 matching the guide column 19 is provided on the semicircular boss 18 of the blank holder base 11. The main purpose is to automatically match the position relationship between the lower die assembly 4 and the blank holder assembly 5 through guidance to avoid relative rotation dislocation between the approximately circular parts.

[0068] As a further solution of the drawing die of the present invention, refer to the attached Figure 2 , Attachment Figure 8The total height of the upper mold assembly 6 is greater than the sum of the thickness of the edge pressing assembly 5 and the depth of the pelvic cavity 1, the length of the guide boss 22 is greater than the depth of the pelvic cavity 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 cavity 1. The main purpose is to solve the risk of rigid collision during mold opening and mold closing because the upper mold assembly 6 is larger than the inner hole contour of the outer slider, while avoiding the risk of overloading of the mold due to the over-table surface and leaving enough coordinated movement stroke.

[0069] As a further solution of the drawing die of the present invention, refer to the attached Figure 2-8 , the width of the lower die adapter plate 8 is ≤ the width of the workbench of the drawing equipment; the width of the edge pressing adapter plate 12 is ≤ the width of the outer slide of the drawing equipment; the length and width of the upper die adapter plate 16 are < the length and width of the inner slide of the drawing equipment. Its main purpose is to ensure smooth mold loading when any part of the mold is much larger than the corresponding part of the equipment, and solve the problem of oversized mold loading through the transfer method.

[0070] As a further solution of the drawing formula of the present invention, refer to the attached Figure 8 In order to avoid manual operation and cause operational errors by repeatedly moving the mold parts alternately, the numerical control instructions and early warning system of the equipment are fully utilized to simplify the operation difficulty. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts includes:

[0071] During mold closing and deep drawing, the sheet is placed above the lower mold assembly, and according to the final mold closing action formula parameters in step 8), the outer slider is first moved to lower the edge clamp assembly 5, and then the inner slider is moved to lower the upper mold assembly 6, and the edge clamp assembly 5 and the upper mold assembly 6 are moved alternately and repeatedly, so that when the edge clamp assembly 5 reaches the mold closing state to clamp the sheet, the remaining stroke of the upper mold assembly 6 is greater than the depth of the basin cavity 1; the upper mold assembly 6 is continued to be lowered for deep drawing;

[0072] When the mold is opened and unloaded, according to the final mold opening action formula parameters in step 8), the upper mold assembly 6 and the edge holding assembly 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 edge holding assembly 5, so that the upper mold assembly 6 reaches the end displacement of the mold opening stroke first.

[0073] As a further solution of the deep drawing formula of the present invention, the depth of the basin component 1 ≤ the preset mold closing anti-collision compensation displacement of the edge holding component 5 ≤ the preset mold opening anti-collision compensation displacement of the upper mold component 6 .

[0074] As a further solution of the drawing formula of the present invention, the sum of the closing compensation displacement of the edge clamping assembly 5 and the depth of the pelvic cavity part 1 is ≤ the difference in height between the guide boss 22 of the upper mold assembly 6 in the closed mold state and the top surface height of the edge clamping adapter plate 12 of the edge clamping assembly 5; the opening compensation displacement of the upper mold assembly 6 and the depth difference of the pelvic cavity part 1 are ≥ the difference in height between the upper mold adapter plate 16 of the upper mold assembly 6 in the closed mold state and the top surface height of the edge clamping adapter plate 12 of the edge clamping assembly 5.

[0075] As a further solution of the drawing formula of the present invention, in order to avoid the problem of eliminating the contradictory alarms of mold closing and mold opening, during the mold closing drawing and mold opening unloading process, the preset descending and ascending speeds of the edge clamping assembly 5 are kept consistent, and during the mold closing drawing and mold opening unloading process, the preset descending and ascending speeds of the upper mold assembly 6 are also kept consistent; the edge clamping assembly 5 and the upper mold assembly 6 are allowed to have an independent movement speed difference.

[0076] Thus, the purpose of the present invention to prevent the motion rigid collision between the oversized mold parts and the equipment parts and the mold parts itself is achieved by relying on the mold structure design and the self-energy control program.

Claims

1. A method for obtaining an intelligent alternating drawing formula for a double-action drawing die for a large deep pelvic cavity part, characterized in that: The method comprises: Step 1) determining the lower limit displacement difference of the movement process of the outer slider and the inner slider of the drawing equipment according to the height difference between the top surfaces of the upper die adapter plate (16) and the edge clamp adapter plate (12) in the mold closing state; Step 2) determining the upper limit displacement difference of the movement process of the outer slider and the inner slider of the drawing equipment according to the height difference between the top surface of the edge clamping adapter plate (12) and the guide boss (22) of the upper mold base (14) in the mold closing state; Step 3) determining the anti-collision compensation margin of the initial mold opening of the slider in the drawing equipment according to the depth of the pelvic cavity part (1) and the upper limit displacement difference; Step 4) determining the initial mold anti-collision compensation margin of the outer slide of the drawing equipment according to the depth of the pelvic cavity part (1) and the lower limit displacement difference; Step 5) according to the initial mold opening anti-collision compensation margin, the initial inner slider speed, and the initial outer slider speed, the upper mold assembly (6) and the lower mold assembly (4) are controlled to rise for mold opening, and during the rising process, the displacement difference between the inner slider and the outer slider is kept less than the upper limit displacement difference. When the mold opening is abnormal, the initial mold opening anti-collision compensation margin of the inner slider is increased or the rising speed of the outer slider is reduced until the mold opening is normal, and the corrected mold opening anti-collision compensation margin, the corrected outer slider speed, and the initial inner slider speed at this time are used as preset mold opening action formula parameters; Step 6) according to the initial mold closing anti-collision compensation margin, the initial inner slider speed, and the corrected outer slider speed in step 5), the upper mold assembly (6) and the lower mold assembly (4) are controlled to descend for mold closing, and the displacement difference between the inner slider and the outer slider is kept greater than the lower limit displacement difference during the descent process. When the mold closing is abnormal, the initial mold closing anti-collision compensation margin is increased or the inner slider descending speed is reduced until the mold closing is normal, and the corrected mold closing anti-collision compensation margin, the corrected inner slider speed, and the corrected outer slider speed in step 5) are used as preset mold closing action formula parameters; Step 7), calling the preset mold opening action formula parameters in step 5) and the preset mold closing action formula parameters in step 6), turning on the alarm system of the drawing equipment, so that the edge holding assembly (5) and the upper mold assembly (6) can repeatedly and normally complete the mold opening and closing actions in the no-load test run under the control of the drawing equipment program, thereby forming the initial action formula parameters for the whole process of mold opening and closing; Step 8), based on the initial action formula parameters of the whole process in step 7), increase the action lower limit displacement difference in step 1) and reduce the action upper limit displacement difference in step 2); repeat the process from step 3) to step 7), so that the edge holding component (5) and the upper mold component (6) can normally complete the mold opening and closing actions again, forming the final action formula parameters of the whole process; The double-action drawing die for a large deep basin cavity part comprises: a lower die assembly (4), a side pressing assembly (5), and an upper die assembly (6); The lower die assembly (4) is fixed on a workbench of the drawing equipment; The upper surface of the edge holding assembly (5) is fixedly connected to the outer slide block of the drawing device, a large through hole (13) is provided at the center of the edge holding assembly (5), and a limited guide groove (21) is provided on the inner wall of the large through hole (13); The upper die assembly (6) comprises: an upper die base (14) and an upper die seat (15); the upper end of the upper die seat (15) is provided with an upper die adapter plate (16) with a larger width, the upper surface of the upper die adapter plate (16) is fixedly connected to the inner slider of the drawing device, 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 component (1) and is larger than the inner contour size of the outer slider of the drawing device, and a guide boss (22) matching the limiting guide groove (21) of the edge pressing assembly (5) is provided above the upper die base (14), and the limiting guide groove (21) is used to limit the downward movement distance of the upper die assembly (6) relative to the edge pressing assembly (5).

2. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to claim 1 is characterized in that: The lower mold assembly (4) comprises: a lower mold base (7) and a lower mold adapter plate (8); The width of the upper surface of the lower die base (7) is greater than the width of the lower surface and the workbench of the drawing equipment. A recessed working surface (9) is provided in the middle of the upper surface to match the annular side wall (3) and the lower surface of the basin bottom of the large deep basin component (1). The outer side of the recessed working surface (9) is provided with an annular pressing surface to match the lower surface of the flange edge (2) of the basin component (1). The lower die adapter plate (8) is arranged on the lower surface of the lower die base (7) for connecting to the workbench of the drawing equipment.

3. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to claim 2 is characterized in that: The edge pressing assembly (5) comprises: an edge pressing base (11) and an edge pressing adapter plate (12); The width of the upper surface of the edge holding base (11) is smaller than that of the lower surface, and the width of the lower surface is larger than the width of the outer contour of the outer slide of the drawing equipment. The lower surface is provided with an annular edge holding surface corresponding to the upper surface of the lower mold base (7). The edge holding adapter plate (12) is connected to the top surface of the edge holding base (11) and is used to connect the outer slide of the drawing equipment.

4. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to claim 3 is characterized in that: The lower mold base (7) and the edge pressing base (11) are provided with mutually matching semicircular bosses (18) on the outer edges of the annular edge pressing surfaces, a guide column (19) is provided on the semicircular boss (18) of the lower mold base (7), and a guide hole (20) matching the guide column (19) is provided on the semicircular boss (18) of the edge pressing base (11).

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

6. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to claim 3 is characterized in that: The width of the lower die adapter plate (8) is less than or equal to the width of the workbench of the drawing equipment; The width of the edge-pressing adapter plate (12) is less than or equal to the width of the outer slide block of the drawing equipment; The length and width of the upper die adapter plate (16) are less than the length and width of the slider in the drawing equipment.

7. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to claim 3 is characterized in that: The method comprises: During mold closing and deep drawing, the sheet is placed above the lower mold assembly, and according to the final mold closing action formula parameters in step 8), the outer slider is first moved to lower the edge holding assembly (5), and then the inner slider is moved to lower the upper mold assembly (6), and the edge holding assembly (5) and the upper mold assembly (6) are moved alternately and repeatedly, so that when the edge holding assembly (5) reaches the mold closing state to clamp the sheet, the remaining stroke of the upper mold assembly (6) is greater than the depth of the basin cavity (1); the upper mold assembly (6) is continued to be lowered for deep drawing; When the mold is opened and unloaded, according to the final mold opening action formula parameters in step 8), the upper mold assembly (6) and the edge pressing assembly (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 edge pressing assembly (5), so that the upper mold assembly (6) reaches the end displacement of the mold opening stroke first.

8. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to claim 7 is characterized in that: The depth of the basin cavity component (1) is ≤ the preset mold closing anti-collision compensation displacement of the edge pressing component (5) ≤ the preset mold opening anti-collision compensation displacement of the upper mold component (6).

9. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to claim 8 is characterized in that: The sum of the mold closing compensation displacement of the edge holding assembly (5) and the depth of the basin cavity (1) is ≤ the height difference between the guide boss (22) of the upper mold assembly (6) in the mold closing state and the top surface height of the edge holding adapter plate (12) of the edge holding assembly (5); The difference between the mold opening compensation displacement of the upper mold assembly (6) and the depth of the pelvic 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) in the mold closing state and the edge clamping adapter plate (12) of the edge clamping assembly (5).

10. The method for obtaining the intelligent alternating drawing formula of the double-action drawing die for large deep basin parts according to any one of claims 1 to 9, characterized in that: During the process of mold closing and drawing and mold opening and unloading, the preset speeds of descending and ascending of the edge holding component (5) remain consistent, and during the process of mold closing and drawing and mold opening and unloading, the preset speeds of descending and ascending of the upper mold component (6) also remain consistent; The edge pressing component (5) and the upper die component (6) are allowed to have an independent movement speed difference.

Images