Double-acting deep drawing die and alternate deep drawing method for large deep-cavity basin-shaped part

Abstract

The invention provides a double-acting deep drawing die for a large deep-cavity basin-shaped part and an alternate deep drawing method. A lower die assembly, an edge pressing assembly and an upper die assembly of the deep drawing die are obviously provided with movement interference parts larger than a working table, an outer sliding block and an inner sliding block of deep 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; by utilizing the geometric height relation design between mold parts, the mold closing stroke and the mold opening stroke are controlled, and the displacement difference between the mold parts is controlled, so that rigid movement collision between the mold and equipment and between the mold parts is avoided. 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 double-action drawing die for a large deep-cavity basin-shaped part and an alternating drawing method. 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 mold structures that can be selected mainly include single-action drawing die and double-action drawing die. Among them, single-action deep drawing relies on the top 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 a cavity-shaped part with a diameter of 1.4 meters and a depth of less than 0.1 meters. 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 double-action drawing die and an alternating drawing method for a large deep-cavity basin-shaped part, which is suitable for ultra-large drawing dies that combine the geometric relationship between die components with the motion relationship between equipment components to control the displacement difference during the motion process and avoid rigid collision drawing.

[0006] The first aspect of the present invention provides a double-action drawing die for a large deep-cavity basin-shaped part, comprising: a lower die assembly 4, a side-holding assembly 5, and an upper die assembly 6;

[0007] The lower die assembly 4 is fixed on the workbench of the drawing equipment;

[0008] 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.

[0009] 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 cavity basin-shaped part 1, and is larger than the inner hole 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.

[0010] Optionally, the lower mold assembly 4 includes: a lower mold base 7 and a lower mold adapter plate 8;

[0011] 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 cavity basin-shaped part 1. 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-shaped part 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.

[0012] Optionally, the edge pressing assembly 5 includes: an edge pressing base 11 and an edge pressing adapter plate 12;

[0013] 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 slider 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 slider of the drawing equipment.

[0014] 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 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.

[0015] Optionally, the total height of the upper mold assembly 6 is greater than the sum of the thickness of the edge clamping assembly 5 and the depth of the basin-shaped member 1, the length of the guide boss 22 is greater than the depth of the basin-shaped member 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 basin-shaped member 1.

[0016] Optionally, the width of the lower die adapter plate 8 is ≤ the width of the workbench of the drawing equipment;

[0017] 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;

[0018] An upper die adapter plate 16 with a larger width is provided at the upper end of the upper die seat 15 , and the length and width of the upper die adapter plate 16 are less than the length and width of the slide block in the deep drawing device.

[0019] A second aspect of the present invention provides an alternating deep drawing method of a double-action deep drawing die for a large deep cavity basin-shaped part, using the die as described in any one of the first aspects, and the alternating deep drawing method of the double-action deep drawing die for a large deep cavity basin-shaped part comprises:

[0020] During die closing and deep drawing, the sheet is placed above the lower die assembly 6, and the outer slider is first moved according to the preset die closing anti-collision compensation displacement to lower the edge holding assembly 5, and then the inner slider is moved to lower the upper die assembly 6, and the edge holding assembly 5 and the upper die assembly 6 are moved alternately and repeatedly, so that when the edge holding assembly 5 reaches the state of die closing and pressing the sheet, the remaining stroke of the upper die assembly 6 is greater than the depth of the basin-shaped part 1, and the upper die assembly 6 is continuously lowered for deep drawing;

[0021] When the mold is opened and unloaded, the upper mold assembly 4 and the edge holding assembly 5 are moved alternately and repeatedly in this order: first, the inner slider is raised according to the preset mold opening anti-collision compensation displacement to raise the upper mold assembly 4, and then the outer slider is raised to raise the edge holding assembly 5, so that the upper mold assembly 4 reaches the end point displacement of the mold opening stroke first.

[0022] Optionally, the depth of the basin-shaped member 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 4 .

[0023] Optionally, the sum of the mold closing compensation displacement of the edge clamping assembly 5 and the depth of the basin-shaped member 1 is ≤ the height difference between the guide boss 22 of the upper mold assembly 6 and the top surface height of the edge clamping adapter plate 12 of the edge clamping assembly 5 in the mold closing state;

[0024] The difference between the mold opening compensation displacement of the upper mold assembly 4 and the depth of the basin-shaped 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 4 and the edge clamping adapter plate 12 of the edge clamping assembly 5 in the mold closing state.

[0025] The beneficial effects of this application are:

[0026] 1) This application solves the problem of mold installation on the table top of the equipment 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.

[0027] 2) This application adopts both internal and external guide mechanisms to achieve indirect guide force transmission between super-large mold components, solving the problem of designing a stable operating mechanism for the working direction of super-large molds.

[0028] 3) This application utilizes the geometric height relationship between mold components, and controls the displacement difference between mold components during mold closing and mold opening strokes by placing the mold components in a static or moving alternating state, thereby avoiding rigid collisions between the mold and the equipment or the mold components themselves.

[0029] Therefore, the mold structure and alternating drawing method adopted in this application can not only overcome the difficulty of existing large-scale deep-cavity basin-shaped parts equipment being limited by the table surface, 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. By drawing on this technical principle, it can also be expanded to be applied to the overall forming of ultra-long and ultra-wide parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the shape of the basin-shaped member of the present application;

[0031] Figure 2 It is a schematic diagram of the assembly structure of the double-action drawing die of the present application;

[0032] 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;

[0033] Figure 4 This is a bottom view structural diagram of the lower die assembly of the double-action drawing die of the present application;

[0034] 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;

[0035] 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;

[0036] 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;

[0037] Figure 8 This application Figure 2 Schematic diagram of the cross-sectional structure of the double-action drawing die;

[0038] Description of reference numerals:

[0039] 1. Basin-shaped part, 2. Flange edge, 3. Annular side wall, 4. Lower die assembly, 5. Binder assembly, 6. Upper die assembly, 7. Lower die base, 8. Lower die adapter plate, 9. Recessed working surface, 10. Annular Binder surface, 11. Binder base, 12. Binder adapter plate, 13. Large through hole, 14. Upper die base, 15. Upper die seat, 16 Upper die adapter plate, 17. Circular working surface, 18. Semicircular boss, 19. Guide column, 20. Guide hole, 21. Limiting guide groove, 22. Guide boss. DETAILED DESCRIPTION

[0040] 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.

[0041] First, the difficulties in realizing integral forming of large deep-cavity basin-shaped parts are introduced.

[0042] See attached Figure 1 , a nearly circular, extra-large deep-cavity basin-shaped part 1 with 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-shaped part 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 by 1.65 meters, and the effective size of the workbench and the outer slider is 1.96 meters by 3.3 meters. The double-action deep drawing requires the effective working surface of the upper die to be embedded in the interior of the outer slider to realize its action principle. For a punch 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 and the outer slider. For a lower die and a blank holder 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 part with a diameter of 3 meters. Not only do the die, blank holder, and punch far exceed the maximum width of the equipment workbench, outer slide, and inner slide, but there are also problems of motion rigid collision between the mold and the equipment and the mold's own components.

[0043] Secondly, the double-action drawing die technical solution of this application to solve the above-mentioned defects of the prior art is introduced

[0044] See attached Figure 2-8 In order to solve the problem that the large basin-shaped part drawing die cannot be loaded due to its large length and width, and the double-action drawing motion has rigid collision, the technical solution of the double-action drawing die in this application is as follows:

[0045] A double-action drawing die for a large deep-cavity basin-shaped part, the drawing die comprises a lower die assembly 4, a edge holding assembly 5, and an upper die assembly 6. The lower die assembly 4, the edge holding assembly 5, and the upper die assembly 6 respectively contain motion interference components that are significantly larger than the corresponding connecting components of the drawing equipment, namely, a workbench, an outer slide, and an inner slide.

[0046] See attached Figure 2-4 The lower die assembly 4 is composed of 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 significantly larger than that of the lower surface, and its upper surface width is significantly larger than the width of the workbench of the drawing equipment. A recessed working surface 9 matching the annular side wall 3 of the basin-shaped part 1 and the lower surface of the basin bottom is provided in the middle of the upper surface, and an annular pressing surface 10 matching the lower surface of the flange edge 2 of the basin-shaped part is provided on the outer side of the recessed working surface 9; the lower die adapter plate 8 is connected to the lower surface of the lower die base 7.

[0047] See attached Figure 2 , Attachment Figure 5 The edge holding assembly 5 is composed of 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 significantly smaller than that of the lower surface, and the width of the lower surface is significantly larger than the width of the outer slide 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, and the middle part of the annular edge holding surface 10 is provided with a large through hole 13 corresponding to the annular side wall 3 of the basin-shaped member 1; the edge holding adapter plate 12 is connected to the top surface of the edge holding base 11, and the middle part is also provided with a large through hole 13 corresponding to the annular side wall 3 of the basin-shaped member 1.

[0048] See attached Figure 2 , Attachment Figure 6 The upper die assembly 6 is composed of an upper die base 14 and an upper die seat 15. The upper die base 14 is an inverted circular dining table structure, and its bottom is a circular working surface 17 that matches the annular side wall 3 of the basin-shaped part 1 and the upper surface of the basin bottom. The circular working surface 17 is significantly larger than the length and width of the slider in the deep drawing equipment; the upper die seat 15 is connected to the top of the circular working surface 17 of the upper die base 14, and the upper end of the upper die seat 15 is provided with an upper die adapter plate 16 with a larger width.

[0049] As a further solution of the drawing die of the present invention, refer to the attached Figure 2-6 In order to solve the problem that the mold parts far exceed the corresponding mold parts of the equipment, there is a risk of movement overload; the lower mold base 7 and the edge holding base 11 are respectively provided with mutually matching semicircular bosses 18 on the outer edges of the annular edge holding surface 10, and a guide column 19 is also provided on the semicircular boss 18 of the lower mold base 7, and a guide hole 20 matching the guide column 19 is also provided on the semicircular boss 18 of the edge holding base 11; the edge holding base 11 and the edge holding adapter plate 12 are provided with built-in guide grooves 21 on the large through holes 13, and the top surface edge of the upper mold base 14 is provided with a guide boss 22 matching the built-in limiting guide groove 21 of the edge holding base 11.

[0050] As a further solution of the drawing die of the present invention, refer to the attached Figure 2 , Attachment Figure 8In order to improve the safety margin of preventing rigid collision during the movement of mold parts and ensure that there is no derailment during the movement process and loading stroke, the total height of the upper mold assembly 6 is greater than the sum of the thickness of the edge clamping assembly 5 and the depth of the basin-shaped member 1, the height of the guide boss 22 of the upper mold base 14 is greater than the depth of the basin-shaped member 1, and the height of the limiting guide groove 21 of the edge clamping assembly 5 is greater than the sum of the height of the guide boss 22 of the upper mold base 14 and the depth of the basin-shaped member 1.

[0051] As a further solution of the drawing die of the present invention, refer to the attached Figure 2-8 In order to realize mold loading when the lower mold base 7, the edge pressing base 11, and the upper mold base 14 of the mold components are obviously larger than the corresponding connecting parts of the equipment, the lower mold adapter plate 8 is a rectangular flat plate structure with a width ≤ the width of the working table of the drawing equipment; the edge pressing adapter plate 12 is a rectangular flat plate structure with a width ≤ the width of the outer slider of the drawing equipment; the upper mold adapter plate 16 is a rectangular flat plate structure with a length and width < the length and width of the inner slider of the equipment drawing equipment.

[0052] The alternate deep drawing forming method using the double-action deep drawing die of the present application is introduced again.

[0053] The double-action drawing die is used to draw the large deep cavity basin-shaped part 1, which mainly includes:

[0054] During die closing and deep drawing, the sheet is placed above the lower die assembly 6, and the outer slider is first moved according to the preset die closing anti-collision compensation displacement to lower the edge holding assembly 5, and then the inner slider is moved to lower the upper die assembly 6, and the edge holding assembly 5 and the upper die assembly 6 are moved alternately and repeatedly, so that when the edge holding assembly 5 reaches the state of die closing and pressing the sheet, the remaining stroke of the upper die assembly 6 is greater than the depth of the basin-shaped part 1, and the upper die assembly 6 is continuously lowered for deep drawing;

[0055] When the mold is opened and unloaded, the upper mold assembly 4 and the edge holding assembly 5 are moved alternately and repeatedly in this order: first, the inner slider is raised according to the preset mold opening anti-collision compensation displacement to raise the upper mold assembly 4, and then the outer slider is raised to raise the edge holding assembly 5, so that the upper mold assembly 4 reaches the end point displacement of the mold opening stroke first.

[0056] As a further solution of the deep drawing forming method of the present invention, the depth of the basin-shaped member 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 4 .

[0057] As a further solution of the deep drawing method of the present invention, the sum of the closing compensation displacement of the edge clamping assembly 5 and the depth of the basin-shaped part 1 is ≤ the difference in height between the guide boss 22 of the upper die assembly 6 in the closed 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 die assembly 4 and the depth difference of the basin-shaped part 1 are ≥ the difference in height between the upper die adapter plate 16 of the upper die assembly 4 and the top surface height of the edge clamping adapter plate 12 of the edge clamping assembly 5 in the closed state.

[0058] At this point, the present invention relies on the structural geometric relationship between mold components, combined with the control of the mold closing and opening strokes, to avoid the rigid collision between the mold and the equipment, and between the mold's own components, thereby achieving the purpose of overall forming of ultra-long and wide parts while adapting to the potential of the excavation equipment.

[0059] Finally, in order to facilitate the technical personnel in this field to correctly understand the intention of the present invention, the present invention needs to further explain the following two points regarding the alternating deep drawing action:

[0060] The first is to achieve alternating deep drawing. Its core is to control the action sequence of the mold parts due to the interference of the super-connected table through the non-interference equipment parts themselves, so that the mold parts can move first, wait, and move later to meet the requirements of deep drawing, mold closing and mold opening, and maintain the predetermined displacement difference relationship between the moving mold parts to prevent the rigid collision between the mold and the equipment and the mold parts themselves. At least two conditions must be met before it can be implemented: first, the motion relationship is fully considered when designing the mold structure and the geometric relationship between the parts; second, the deep drawing equipment used has the functions of displaying the displacement of equipment parts, controlling any displacement stop, monitoring the displacement difference, system alarm, and adjusting the speed of equipment parts. Therefore, the alternating deep drawing of large double-action molds on super-equipment tables is a high-risk, high-tech and comprehensive problem. For those with limited implementation conditions, insufficient professional knowledge or non-professionals, it is forbidden to imitate. The consequences of economic losses and safety accidents caused by insufficient technology and implementation conditions are at their own risk.

[0061] Second, the technical solution described in the embodiment of the present application is not only applicable to large deep-cavity basin-shaped parts, but also can represent ultra-wide and ultra-long large parts; obviously, the embodiment described in the present application is only a part of the present invention, not all embodiments. Therefore, the above is only one of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any modification and improvement of the mold shape to adapt to the specific shape of the product within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A double-action drawing die for large deep-cavity basin-shaped parts, characterized in that: It 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 pressing 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 pressing 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 cavity basin-shaped part (1), and is larger than the inner hole profile size of the outer slider of the drawing device, and 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).

2. The double-action drawing die for large deep-cavity basin-shaped 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, which matches the annular side wall (3) and the lower surface of the basin bottom of the large deep cavity basin-shaped part (1). The outer side of the recessed working surface (9) is provided with an annular pressing surface, which matches the lower surface of the flange edge (2) of the basin-shaped part (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 double-action drawing die for large deep cavity basin-shaped 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 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 double-action drawing die for large deep cavity basin-shaped 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 double-action drawing die for large deep cavity basin-shaped 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 edge pressing assembly (5) and the depth of the basin-shaped member (1), the length of the guide boss (22) is greater than the depth of the basin-shaped member (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 basin-shaped member (1).

6. The double-action drawing die for large deep cavity basin-shaped parts according to claim 3, 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. An alternating drawing method for a double-action drawing die for a large deep-cavity basin-shaped part, characterized in that: Using the mold according to any one of claims 1 to 6, the method comprises: During mold closing and deep drawing, the sheet material is placed above the lower mold assembly (6), and the outer slider is first moved according to the preset mold closing anti-collision compensation displacement to lower the edge holding assembly (5), and then the inner slider is moved to lower the upper mold assembly (6). The edge holding assembly (5) and the upper mold assembly (6) are moved repeatedly and alternately, so that when the edge holding assembly (5) reaches the mold closing state to clamp the sheet material, the remaining stroke of the upper mold assembly (6) is greater than the depth of the basin-shaped part (1), and the upper mold assembly (6) is continuously lowered to perform deep drawing; When the mold is opened and unloaded, the upper mold assembly (4) and the edge pressing assembly (5) are moved alternately and repeatedly in the following order: first, the inner slider is raised according to the preset mold opening anti-collision compensation displacement to raise the upper mold assembly (4), and then the outer slider is raised to raise the edge pressing assembly (5), so that the upper mold assembly (4) reaches the end displacement of the mold opening stroke first.

8. The alternating drawing method of a double-action drawing die for a large deep cavity basin-shaped part according to claim 7, characterized in that: The depth of the basin-shaped 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 (4).

9. The alternating drawing method of a double-action drawing die for a large deep cavity basin-shaped part according to claim 8, characterized in that: The sum of the mold closing compensation displacement of the edge clamping assembly (5) and the depth of the basin-shaped member (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 clamping adapter plate (12) of the edge clamping assembly (5); The difference between the mold opening compensation displacement of the upper mold assembly (4) and the depth of the basin-shaped 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 (4) in the mold closing state and the edge pressing adapter plate (12) of the edge pressing assembly (5).

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