A double-action drawing die for large deep-cavity basin-shaped parts and an alternating drawing method

Abstract

The present invention provides a double-action drawing die and alternating drawing method for large deep-cavity basin-shaped parts. The lower die assembly, the edge-holding assembly, and the upper die assembly of the drawing die each contain motion interference components that are significantly larger than the worktable, outer slide, and inner slide of the drawing equipment. The problem of installing the ultra-large drawing die on the equipment is solved by designing the lower die assembly, the edge-holding assembly, and the upper die assembly with non-uniform cross-sections of the upper and lower surface contours. The problem of reliable operation of the ultra-large drawing die is solved by designing external and internal guide mechanisms, rationally matching the guide stroke, and adopting indirect guide transmission. The problem of dynamic rigid collision between the mold and the equipment, and between the mold components themselves, is avoided by utilizing the geometric height relationship design between the mold components and controlling the displacement difference between the mold components during the mold closing and opening strokes. The technology of this application can maximize the processing potential of existing double-action drawing equipment, realize the integral forming of ultra-long and ultra-wide large deep-cavity thin shell parts, and especially increase the forming width limit to twice that of the existing technology.

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 new aircraft continue to demand higher service life and aerodynamic performance, the integrated forming of large sheet metal parts significantly reduces deformation caused by welding or riveting. This not only makes the structure lighter but also significantly improves assembly coordination accuracy and efficiency. As a result, the integrated forming of ultra-large, thin-walled parts is gaining increasing attention in aircraft applications.

[0003] As is known to all, 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 drawing relies on the push rods around the punch to provide blanking force. In order to ensure that the blanking force around the part is uniform, the maximum width of blanking force that can be provided by single-action drawing equipment in China is only 1.6 meters. Therefore, the maximum diameter can only be used to form cavity-shaped parts 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 drawing relies on the outer slider of the equipment to provide blanking force. It is suitable for installing ultra-large molds with blanking rings and dies that are close to the full surface of the table. However, the double-action principle requires the upper mold to be embedded in the inner slider along with the inner slider. At present, the effective size of the workbench and outer slider of large-scale mainstream domestic drawing equipment is 1.96 meters x 3.3 meters, and the size of the inner slider is only 1.4 meters x 1.65 meters. Limited by the double-action drawing principle and equipment structure, conventional mold structures cannot unleash the potential of double-action drawing equipment to form larger parts, especially large and medium-sized aircraft engine air inlets and engine tail nozzle skins, 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 reaches twice that of the inner slider.

[0004] The essence of alternating drawing is to prevent rigid collisions between the mold and the equipment, as well as between the mold's components, by controlling the sequence of mold component movements, matching component movement speeds, and monitoring equipment component displacement differences. Therefore, alternating-function drawing dies not only meet the basic requirements of conventional molds but also consider numerous factors, such as interference between components and the difference in independent movement speeds between the inner and outer slides of the equipment. This presents an urgent engineering challenge hindering the lightweight, integral forming of larger, complex three-dimensional parts in the plastics industry. Summary of the Invention

[0005] The present invention provides a double-action drawing die and an alternating drawing method for large deep-cavity basin-shaped parts, which are suitable for ultra-large drawing dies. By combining the geometric relationship between die components with the motion relationship between equipment components, the displacement difference during the motion process is controlled to avoid rigid collision drawing.

[0006] A 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 slider of the drawing equipment. A large through hole 13 is provided in 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.

[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 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 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 holding 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 edge holding 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 pressure edge 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 holding assembly 5 includes: an edge holding base 11 and an edge holding 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 holding base 11 are provided with mutually matching semicircular bosses 18 on the outer edges of the annular edge holding surface, 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 holding base 11.

[0015] 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 basin-shaped part 1, the length of the guide boss 22 is greater than the depth of the basin-shaped 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 basin-shaped part 1.

[0016] Optionally, the width of the lower die adapter plate 8 is less than or equal to 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 slider 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 base 15 , and 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.

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

[0020] During mold closing and drawing, the sheet is placed above the lower mold assembly 6, and the outer slider is moved according to the preset mold closing anti-collision compensation displacement to lower the edge holder assembly 5, and then the inner slider is moved to lower the upper mold assembly 6. The edge holder assembly 5 and the upper mold assembly 6 are moved alternately and repeatedly. When the edge holder assembly 5 reaches the mold closing state to press the sheet, 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 continued to be lowered for deep drawing;

[0021] When the mold is opened and unloading is carried out, the upper mold assembly 4 and the edge holding assembly 5 are moved alternately and repeatedly in the order of first raising the inner slider according to the preset mold opening anti-collision compensation displacement to raise the upper mold assembly 4, and then raising the outer slider 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 holding 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 of the edge holding adapter plate 12 of the edge holding 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 holding adapter plate 12 of the edge holding 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 built-in guide and external guide mechanisms to achieve indirect guide force transmission between super-large mold components, solving the design problem of stable operation mechanism of super-large mold working direction.

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

[0029] Therefore, the mold structure and alternating drawing method adopted in this application can not only overcome the difficulties in realizing the double-action drawing principle of large molds caused by the limitation of the table surface of existing large-scale deep-cavity basin-shaped parts equipment; 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 apply 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 This is a schematic diagram of the assembly structure of the double-action drawing die of this 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 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 blanking assembly of the present application;

[0035] Figure 6 This 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 This is a bottom-up 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. Limit guide groove, 22. Guide boss. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described 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 achieving integral forming of large deep-cavity basin-shaped parts are introduced.

[0042] Refer to the attached Figure 1 , a nearly circular, extra-large deep-cavity basin-shaped part 1 containing a flange edge 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 X 1.65 meters, and the effective size of the workbench and outer slider is 1.96 meters X 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 punches 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 punches with a width greater than 1.96 meters between the lower die and the blank holder, 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 unleash 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 mold 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 between the mold's own components.

[0043] Next, we introduce the double-action drawing die technology solution to solve the above-mentioned technical defects of the prior art.

[0044] Refer to the attached Figure 2-8 In order to solve the problems of large basin-shaped parts drawing dies that cannot be loaded due to their large length and width, and the rigid collision of double-action drawing movements, 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 side holding assembly 5, and an upper die assembly 6. The lower die assembly 4, the side 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 the workbench, outer slider, and inner slider.

[0046] Refer to the attached Figure 2-4 The lower die assembly 4 consists 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 is provided in the middle of the upper surface, which matches the annular side wall 3 of the basin-shaped part 1 and the lower surface of the basin bottom. The outer side of the recessed working surface 9 is provided with an annular pressure edge surface 10 that matches the lower surface of the flange edge 2 of the basin-shaped part; the lower die adapter plate 8 is connected to the lower surface of the lower die base 7.

[0047] Refer to the attached Figure 2 , Attachment Figure 5 The edge holding assembly 5 is composed of a edge holding base 11 and a 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 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, 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 part 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 part 1.

[0048] Refer to the attached Figure 2 , Attachment Figure 6 The upper die assembly 6 consists 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 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 clamping base 11 are respectively provided with mutually matching semicircular bosses 18 on the outer edges of the annular clamping 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 clamping base 11; the clamping base 11 and the clamping adapter plate 12 are provided with a built-in guide groove 21 on the large through hole 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 clamping 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 part 1, the height of the guide boss 22 of the upper mold base 14 is greater than the depth of the basin-shaped part 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 part 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 holding 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 workbench of the drawing equipment; the edge holding 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 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 mold closing and drawing, the sheet is placed above the lower mold assembly 6, and the outer slider is moved according to the preset mold closing anti-collision compensation displacement to lower the edge holder assembly 5, and then the inner slider is moved to lower the upper mold assembly 6. The edge holder assembly 5 and the upper mold assembly 6 are moved alternately and repeatedly. When the edge holder assembly 5 reaches the mold closing state to press the sheet, 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 continued to be lowered for deep drawing;

[0055] When the mold is opened and unloading is carried out, the upper mold assembly 4 and the edge holding assembly 5 are moved alternately and repeatedly in the order of first raising the inner slider according to the preset mold opening anti-collision compensation displacement to raise the upper mold assembly 4, and then raising the outer slider 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 method of the present invention, the depth of the basin-shaped part 1 is ≤ 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 4.

[0057] As a further solution of the deep drawing forming method of the present invention, the sum of the mold closing compensation displacement of the edge holding assembly 5 and the depth of the basin-shaped part 1 is ≤ the difference in height between the guide boss 22 of the upper mold assembly 6 and the top surface height of the edge holding adapter plate 12 of the edge holding assembly 5 in the mold closing state; the difference in height between the mold opening compensation displacement of the upper mold assembly 4 and the depth of the basin-shaped part 1 is ≥ the difference in height between the upper mold adapter plate 16 of the upper mold assembly 4 and the top surface height of the edge holding adapter plate 12 of the edge holding assembly 5 in the mold closing 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 achieve the purpose of avoiding rigid collisions between the mold and the equipment, and between the mold components themselves, thereby realizing the potential of the excavation equipment to adapt to the overall forming of ultra-long and wide parts.

[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 motion:

[0060] The first is to achieve alternating deep drawing. This approach relies on rationally designed geometric and kinematic relationships between mold components. Using non-interfering equipment components, the mold components' movements are controlled sequentially, even when interfering with the super-connected table. This allows the mold components to move first, wait, and then move later to meet the requirements of deep drawing's mold closing and opening movements. This maintains a predetermined displacement differential between the moving mold components, preventing rigid collisions between the mold and the equipment itself, as well as between the mold itself. Implementation requires at least two conditions: first, the mold structure and the geometric relationships between components are fully considered in the design of kinematic relationships; second, the drawing equipment used must have functions such as displaying component displacement, controlling arbitrary displacement stops, monitoring displacement differentials, issuing system alarms, and adjusting component speeds. Therefore, implementing alternating deep drawing with large, double-action molds exceeding the machine table presents a complex and complex challenge characterized by high risk and technical difficulty. Those with limited implementation conditions, insufficient expertise, or non-professional expertise are prohibited from imitating the concept. Any economic losses or safety incidents caused by such limitations are at their own risk.

[0061] Second, the technical solutions described in the embodiments of this application are not only applicable to large deep-cavity basin-shaped parts, but also can represent ultra-wide and ultra-long large parts. Obviously, the embodiments described in this application are only part of the present invention, not all of it. Therefore, the above is only one of the preferred embodiments of the present invention and is not intended to limit the present invention. Any modifications and improvements to the mold shape to adapt to specific product shapes within the spirit and principles of the present invention shall fall within the scope of protection 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 slider of the drawing equipment, 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); an upper die adapter plate (16) with a larger width is provided at the upper end of the upper die seat (15); 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; a guide boss (22) matching the limiting guide groove (21) of the edge 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 edge pressing assembly (5); The edge holding assembly (5) comprises: 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 that of the outer slider of the drawing equipment. The edge-holding adapter plate (12) is connected to the top surface of the edge-holding base (11) and is used to connect to the outer slider of the drawing equipment.

2. The double-action drawing die for large deep cavity basin-shaped parts according to claim 1, 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 pressure edge surface, which matches the lower surface of the flange edge (2) of the basin-shaped part (1). The lower die adapter plate (8) is provided 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, characterized in that: The lower surface of the edge pressing base (11) is provided with an annular edge pressing surface corresponding to the upper surface of the lower mold base (7).

4. The double-action drawing die for large deep cavity basin-shaped parts according to claim 3, 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 drawing equipment workbench; The width of the edge-pressing adapter plate (12) is less than or equal to the width of the outer slider 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 large deep cavity basin-shaped part with a double-action drawing die, 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 (4), 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 alternately and repeatedly. When the edge holding assembly (5) reaches the mold closing state to press 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 continued to be lowered for deep drawing; When the mold is opened and unloaded, the upper mold assembly (6) 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 (6), and then the outer slider is raised 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 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 member (1) is less than or equal to the preset mold closing anti-collision compensation displacement of the edge pressing assembly (5) and less than or equal to the preset mold opening anti-collision compensation displacement of the upper mold assembly (6).

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 holding 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 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 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 (6) in the mold closing state and the edge pressing adapter plate (12) of the edge pressing assembly (5).

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