A flexible bidirectional deep drawing method and apparatus for thin-walled, multi-reinforced, basin-shaped parts.

Abstract

This invention provides a flexible bidirectional deep drawing method and apparatus for thin-walled, multi-reinforced, basin-shaped parts, comprising the following steps: constructing a deep-drawn body, constructing a transition top surface, fabricating a curvature blank with pre-drilled holes, manufacturing a deep-drawing die, manufacturing a trimming die, deep drawing, cutting, and trimming. This invention utilizes a double-acting hydraulic press for progressive bidirectional forming, combining the advantages of deep drawing and rubber forming, thus solving the problem of complex processes involving deep drawing followed by hydraulic forming. Through the curvature-textured design with pre-drilled reinforcing holes, flexible medium expansion forming is achieved during the deep drawing process, improving the mechanization level and product quality stability of thin-walled sheet metal parts with unidirectional reinforcing holes.

Description

Technical Field

[0001] This invention relates to sheet metal part forming technology in the field of aircraft manufacturing, specifically a flexible bidirectional deep drawing method and apparatus for thin-walled, multi-reinforced, hole-shaped basin parts. Background Technology

[0002] In aerospace, automotive manufacturing and other fields, thin-walled reinforced basin-shaped sheet metal parts are widely used due to their good structural strength and lightweight characteristics. One type of basin-shaped part with dense reinforcing holes is characterized by thin material, large size and complex shape. It has many advantages such as enhanced structural strength, improved connection reliability and optimized aerodynamic performance. It is often used to precisely connect with other components during the assembly process. Therefore, the forming quality of such parts must be strictly guaranteed during the manufacturing process.

[0003] The most prominent feature of thin-walled basin-shaped sheet metal parts with densely packed, unidirectional reinforcing holes is that the part, approximately 1400mm x 700mm, is composed of three curved surfaces with different curvatures. For such large and complex-shaped parts, the degree of deformation in each part is quite complex, and the part is prone to thinning and breakage. Generally, these parts are processed using deep drawing pre-forming followed by hydroforming, and finally, a manual, incremental cutting method is used to obtain qualified parts. This process is complex, cumbersome, time-consuming, and labor-intensive. Furthermore, in the aircraft sheet metal industry, due to the variety of parts and small batch sizes, manual unloading is still used. The unloading process after deep drawing has a profound impact on the quality of the finished part and the life of the mold. Improper unloading methods increase the risk of deformation or breakage of large, thin-walled parts, and can also easily damage the mold and cause worker safety issues. Therefore, improving forming efficiency and optimizing the unloading process are key issues in the deep drawing process of thin-walled basin-shaped sheet metal parts with densely packed, unidirectional reinforcing holes.

[0004] To meet the high-efficiency and high-quality forming requirements of thin-walled basin-shaped sheet metal parts with dense, unidirectional reinforcing holes, an advanced forming method is needed to ensure stable production of the parts, and a mechanized unloading method is also needed to replace manual unloading in order to ensure the overall quality and production efficiency of the parts. Summary of the Invention

[0005] To address the inefficiency caused by traditional manufacturing processes for thin-walled basin-shaped sheet metal parts with densely packed unidirectional reinforcing holes, avoid wrinkling and cracking issues that easily occur during the deep drawing process of complex surfaces, and simplify the unloading process after deep drawing, the present invention aims to provide a flexible bidirectional deep drawing method and apparatus for thin-walled basin-shaped parts with multiple reinforcing holes. This method is designed to improve the forming accuracy and production efficiency of basin-shaped parts.

[0006] The first aspect of this invention provides a flexible bidirectional deep drawing method for thin-walled, multi-reinforced, basin-shaped parts, comprising the following steps:

[0007] Step 1: Based on the thin-walled, multi-reinforced, basin-shaped part to be processed, construct a theoretical deep-drawing model. The deep-drawing model includes:

[0008] The transition surface is composed of the theoretical inner surface of the digital model of the basin-shaped part and the supplementary surface. The supplementary surface is formed by filling the reinforcing holes and edge gaps of the inner surface of the basin-shaped part with curved surfaces.

[0009] The end wrapping surface is formed by extending 30mm outward from the end of the transition surface (excluding the flange profile) to fill the end. This transition wrapping surface is then extended outward by a radius h to form the end wrapping surface. The radius h is consistent with the fillet radius of the flange profile and sidewall profile in the transition surface. The transition fillet R1 in the transition wrapping surface is consistent with the theoretical fillet radius of the corresponding product outer surface position. The transition fillets R on both sides... c =2×R1;

[0010] The flange face, unified with the flange profile in the transition surface, is extended and connected to the end wrapping surface to form a theoretical deep-drawn body model. The transition fillet R between the end wrapping surface and the flange face... f It should be consistent with the theoretical fillet at the corresponding transition surface position;

[0011] Step 2: Construct a transition top surface model for a basin-shaped component:

[0012] The reinforcing holes and horseshoe-shaped features in the theoretical deep-drawn forming model of the basin-shaped part are filled with curved surfaces and offset t towards the outer surface to form the transition top surface model of the basin-shaped part.

[0013] Step 3: Obtain the blank size requirements based on the theoretical deep-drawing model, and generate a curvature blank with pre-drilled holes;

[0014] 3-1: Design and unfold the blank

[0015] The blank of the theoretical deep-drawn forming model of the basin-shaped part was calculated using the blank back calculation function of the finite element analysis software.

[0016] 3-2: Design curvature blank

[0017] Add a 15mm to 20mm process allowance around the above-mentioned unfolded blank size as the blank for cutting. The blank is designed with the curvature of the flange surface of the basin-shaped part, and is called the curvature blank.

[0018] 3-3: Design of a curvature blank with pre-drilled holes

[0019] Prepared holes of corresponding size are set on the curvature blank at the positions of the reinforcing holes in the digital model of the basin-shaped part, forming a curvature blank with prepared holes.

[0020] Step 4: Based on the theoretical deep-drawing forming body model, manufacture the punch, blank holder, and die of the deep-drawing die. The working surface of the punch corresponds to the top surface of the transition surface of the theoretical deep-drawing forming body model, and the working surface of the blank holder corresponds to the flange surface of the theoretical deep-drawing forming body model. Draw the outline of the blank on the blank holder. The gap g between the working surface of the die and the corresponding part of the blank holder is designed according to the formula g = 1.1 × t.

[0021] Step 5: Based on the transition top surface model of the basin-shaped part, manufacture the ejector of the deep drawing die. The working surface of the ejector corresponds to the transition top surface model of the basin-shaped part. The side of the ejector fits with the die cavity, and an "inverted T" shaped groove is set on the top. The ejector is fixed to the upper template by bolts of the same structure. The ejector is made of polyurethane material to ensure the fit of the reinforcing hole after forming.

[0022] Step 6: Based on the theoretical deep-drawing model, manufacture the trimming die. The working surface of the trimming die corresponds to the theoretical deep-drawing model. Draw the outline of the multi-reinforced hole basin-shaped part and the outline of the reinforcing holes on the trimming die.

[0023] Step 7: Make the blank according to the size requirements of the blank, make the pre-drilled holes for the reinforcing holes in the blank, and then pre-form the arc according to the curvature of the flange surface of the basin-shaped part to obtain the curvature blank with the pre-drilled holes.

[0024] Step 8: Deep draw the curved blank with the pre-drilled hole into shape on the deep drawing die to obtain the deep-drawn body.

[0025] 8-1: Install the drawing die. Fix the upper template of the ejector to the double-acting hydraulic press using the inner slider. Similarly, fix the die to the double-acting hydraulic press using the outer slider. Apply lubricating oil to the contact area of ​​the curved blank with the pre-drilled hole, the die, the ejector, and the blank holder. Move the blank holder upwards to be flush with the top surface of the punch. Place the curved blank with the pre-drilled hole on the working surface of the blank holder according to the outline of the unfolded blank on the blank holder. The punch, die, blank holder, and ejector control the drawing direction using guide pillars.

[0026] 8-2: At the start of forming, the ejector and die move downwards simultaneously until the die contacts the curved blank with the pre-drilled hole. The ejector stops moving, while the die and blank holder contact and clamp the curved blank with the pre-drilled hole and continue to move. Under the combined action of blank holder force and drawing force, the blank is drawn according to the working surface of the punch. The curved blank with the pre-drilled hole flows upwards to form a transitional drawn body. At this time, the ejector moves downwards and presses against the top surface of the punch. Under the action of covering pressure, a reinforcing hole is formed according to the punch surface, and finally the actual drawn body of the basin-shaped part is formed.

[0027] 8-3: After the deep drawing process is completed, the die first moves upward with the upper die plate and separates from the actual deep-drawn basin-shaped part. Then the ejector leaves the actual deep-drawn basin-shaped part, indicating that the entire forming process is over.

[0028] Step 9: Remove the process allowance on the inner and outer sides of the actual deep-drawn forming body of the basin-shaped part according to the outline of the part on the trimmed tire and the outline of the reinforcing hole, to obtain a thin-walled basin-shaped part with multiple reinforcing holes whose shape tolerance meets the design requirements.

[0029] A second aspect of the present invention provides a flexible bidirectional deep drawing apparatus for thin-walled multi-reinforced hole basin-shaped parts, for performing the method as described in any one of the first aspects.

[0030] The beneficial effects of this invention are as follows: 1) This invention provides an integral forming method for thin-walled, multi-reinforced, basin-shaped parts. By using a double-acting hydraulic press for gradual bidirectional forming, it solves the problem of complex processes involving deep drawing followed by hydraulic forming, and has significant practical value. 2) This invention provides a design method for a mold combining dissimilar materials. By employing a flexible ejector and its gradual movement with the die, it changes the traditional deep drawing forming mode, reducing the tendency of material instability and wrinkling. This new type of mold has a simple structure design, installation, and operation, and is easy to promote and implement. 3) This mold structure can complete the unloading process during forming, especially for large-sized parts with low drawing heights, avoiding damage to the parts and mold caused by manual unloading. 4) This forming method combines the advantages of deep drawing and rubber forming. Through the curvature hairline design with reinforcing hole pre-holes, flexible medium expansion forming is achieved during deep drawing, which is of profound significance for parts with reinforcing holes, ensuring accurate part shape and high forming precision. 5) This bidirectional deep drawing forming method has strong versatility and can be used for forming thin-walled sheet metal parts with unidirectional reinforcing holes. This method has a high degree of mechanization and stable product quality. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the basin-shaped component;

[0032] Figure 2 This is a schematic diagram of the theoretical deep-drawn structure of a basin-shaped part;

[0033] Figure 3 This is a schematic diagram of the unfolded blank structure of a basin-shaped part in theoretical deep drawing.

[0034] Figure 4 This is a schematic diagram of the curvature blank structure of a basin-shaped part with a pre-drilled body.

[0035] Figure 5 This is a schematic diagram of the deep drawing die structure for a basin-shaped part;

[0036] Figure 6This is a schematic diagram of the structure of a basin-shaped trimmed tire;

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Multi-reinforced hole basin-shaped part; 2. Complex curved surface; 3. Reinforced hole; 4. Flanged flange; 5. Horseshoe mark; 6. Edge notch; 7. Theoretical deep-drawn part; 8. Transition surface; 9. Theoretical inner surface; 10. Supplementary surface; 11. Flange face; 12. End wrapping surface; 13. Transition wrapping surface; 14. Transition top surface; 15. Unrolled blank; 16. Blanking blank; 17. Curvature blank; 18. Preparatory hole; 19. Curvature blank with preparatory hole; 20. Deep drawing die; 21. Punch; 22. Blank holder; 23. Die; 24. Ejector; 25. Groove; 26. Upper template; 27. Trimming die; 28. Outline; 29. ​​Outline of oblong reinforcing hole. Detailed Implementation

[0039] The present application will be described in further detail below with reference to the accompanying drawings.

[0040] See appendix Figure 1 The multi-reinforced hole basin-shaped part 1 is a typical thin-walled shell structure formed by a complex curved surface 2, 16 elongated oval reinforcing holes of different sizes 3, a flanged flange 4, a row of uniform horseshoe marks 5, and edge notches 6. The material thickness of the basin-shaped part is denoted as t, where t = 1.0 mm. It has a large external size and a complex shape. The traditional deep drawing followed by hydraulic forming process is complicated and inefficient. After forming, the part is stuck in the deep drawing die cavity and is difficult to remove. This method cannot guarantee the stable forming quality and high-precision assembly requirements of the multi-reinforced hole basin-shaped part. In addition, manual unloading is time-consuming, labor-intensive, and has poor safety.

[0041] like Figure 2-6 As shown, a flexible bidirectional deep drawing method for thin-walled, multi-reinforced, basin-shaped parts includes the following steps:

[0042] Step 1: Based on the thin-walled, multi-reinforced, basin-shaped part to be processed, construct a theoretical deep-drawing model 7. The deep-drawing model 7 includes:

[0043] Transition surface 8 is composed of the theoretical inner surface 9 of the digital model of the basin-shaped part and supplementary surface 10. Supplementary surface 10 is formed by filling the inner surface reinforcing hole 3 and edge notch 6 of the basin-shaped part with a curved surface.

[0044] The end wrapping surface 12 extends outward by 30mm from the end of the transition surface 8 (excluding the flange profile) to form a transition wrapping surface 13. The transition wrapping surface 13 is then extended outward by h to form the end wrapping surface 12. The radius of the fillet between h and the flange profile and sidewall profile in the transition surface is consistent. The transition fillet R1 in the transition wrapping surface 13 is consistent with the theoretical fillet radius of the corresponding product outer surface position. The transition fillets R on both sides... c =2×R1;

[0045] Flange face 11, which is consistent with the flange profile in the transition surface, is extended and connected to the end wrapping surface 12 to form the theoretical deep-drawing model 7. The transition fillet R between the end wrapping surface 12 and the flange face 11 is... f It should be consistent with the theoretical fillet at the corresponding transition surface position;

[0046] Step 2: Construct a transition top surface model for a basin-shaped component 14:

[0047] The holes after removing the features of the reinforcing hole 3 and horseshoe mark 5 in the theoretical deep drawing model 7 of the basin-shaped part are filled with curved surfaces and offset t towards the outer surface to form the transition top surface model 14 of the basin-shaped part.

[0048] Step 3: Obtain the dimensional requirements of the blank 16 according to the theoretical deep drawing model, and generate the curvature blank 19 with the pre-drilled hole;

[0049] 3-1: Design unfolded blank 15

[0050] The blank 15 of the theoretical deep-drawing model 7 of the basin-shaped part was calculated using the blank back calculation function of the finite element analysis software.

[0051] 3-2: Design curvature blank

[0052] Add a 15mm to 20mm process allowance around the size of the above-mentioned unfolded blank 15 as the blank 16. The blank 16 is designed with the curvature of the flange surface 11 of the basin-shaped part as the curvature blank 17.

[0053] 3-3: Design of a curvature blank with pre-drilled holes 19

[0054] A preparatory hole 18 of corresponding size is set on the curvature blank 17 at the position of the reinforcing hole 3 corresponding to the digital model of the basin-shaped part, forming a curvature blank 19 with a preparatory hole.

[0055] Step 4: Based on the theoretical deep drawing forming body model 7, manufacture the punch 21, blank holder 22, and die 23 of the deep drawing die 20. The working surface of the punch 21 corresponds to the top surface of the transition surface 8 of the theoretical deep drawing forming body model, and the working surface of the blank holder 22 corresponds to the flange surface 11 of the theoretical deep drawing forming body model. Draw the blank outline on the blank holder 22. The gap g between the working surface of the die 23 and the corresponding part of the blank holder 22 is designed according to the formula g = 1.1 × t.

[0056] Step 5: Based on the transition top surface model 14 of the basin-shaped part, manufacture the ejector 24 of the deep drawing die. The working surface of the ejector 24 corresponds to the transition top surface model 14 of the basin-shaped part. The side of the ejector 24 fits with the die 23. An inverted T-shaped groove 25 is set on the top. The ejector is fixed to the upper template 26 by bolts of the same structure. The ejector is made of polyurethane material to ensure the fit of the reinforcing hole after forming.

[0057] Step 6: Based on the theoretical deep drawing model 7, manufacture the trimming die 27. The working surface of the trimming die 27 corresponds to the theoretical deep drawing model 7. Draw the outline 28 of the multi-reinforced hole basin-shaped part and the outline 29 of the reinforcing hole on the trimming die 27.

[0058] Step 7: Make blank 16 according to the blank size requirements, make preparation holes 18 for reinforcing holes in blank 16, and then preform the arc according to the curvature of the flange surface 11 of the basin-shaped part to obtain the curvature blank 19 with preparation holes.

[0059] Step 8: Deep draw the curved blank 19 with the pre-drilled hole into shape on the deep drawing die to obtain the deep-drawn body.

[0060] 8-1: Install the drawing die 20, fix the upper template 26 connected to the ejector 24 to the top of the double-acting hydraulic press by the inner slider, and similarly fix the die 23 to the top of the double-acting hydraulic press by the outer slider. Apply lubricating oil to the contact area of ​​the curved blank 19 with the pre-drilled hole, the die 23, the ejector 24 and the blank holder 22 for lubrication. Move the blank holder 22 upward and flush with the top surface of the punch 21. According to the outline of the unfolded blank on the blank holder 22, place the curved blank 19 with the pre-drilled hole on the working surface of the blank holder 22. The punch 21, the die 23, the blank holder 22 and the ejector 24 are controlled by the guide post to control the drawing direction.

[0061] 8-2: Forming begins. The ejector 24 and the die 23 move downwards simultaneously until the die 23 contacts the curved blank 19 with the pre-drilled hole. The ejector 24 stops moving, while the die 23 and the blank holder 22 contact and clamp the curved blank 19 with the pre-drilled hole and continue to move. Under the combined action of the blank holder force and the drawing force, the blank is drawn according to the working surface of the punch 21. The curved blank 19 with the pre-drilled hole flows upward to form a transitional drawn body. At this time, the ejector 24 moves downwards and presses against the top surface of the punch 21. Under the action of the covering pressure, a reinforcing hole is formed according to the surface of the punch 21, and finally the actual drawn body of the basin-shaped part is formed.

[0062] 8-3: After the deep drawing process is completed, the die 23 first moves upward with the upper die plate 26 and separates from the actual deep-drawn basin-shaped part. Then the ejector 24 leaves the actual deep-drawn basin-shaped part, indicating that the entire forming process is over.

[0063] Step 9: Cutting and trimming

[0064] By removing the process allowances on the inner and outer sides of the actual deep-drawn forming body of the basin-shaped part according to the outer contour lines 28 and 29 of the reinforcing holes on the trimmed tire 27, a thin-walled multi-reinforcing hole basin-shaped part 1 product with shape tolerances meeting the design requirements is obtained.

[0065] Several points need to be explained: 1) Although the deep drawing process mainly involves the flow of sidewall and flange material, a certain process allowance still needs to be added to the pre-drilled holes of the curvature blank to ensure the accuracy of the reinforcing hole size of the part during the second deep drawing, and also to avoid the breakage of the part during the forming process; 2) The polyurethane rubber block selected for the ejector has certain hardness requirements. If the material is too soft, it cannot pressurize; if it is too hard, it restricts the feeding. It needs to be controlled within the Shore hardness range of 70 to 73. At the same time, a certain space needs to be reserved at the bolt connection between the ejector and the upper template for the flow of rubber during forming.

Claims

1. A flexible bidirectional deep drawing method for thin-walled, multi-reinforced, basin-shaped parts, characterized in that, The steps are as follows: Step 1: Based on the thin-walled, multi-reinforced, basin-shaped part to be processed, construct a theoretical deep-drawing model. The theoretical deep-drawing model includes: The transition surface is composed of the theoretical inner surface and the supplementary surface of the digital model of the basin-shaped part; the supplementary surface is formed by filling the reinforcing holes and edge gaps of the inner surface of the basin-shaped part with curved surfaces; The end wrapping surface is formed by extending the portion of the transition surface (excluding the flange profile) outward by 30mm and filling the end. The transition wrapping surface is then extended outward by a distance h to form the end wrapping surface. The distance h is the same as the radius of the fillet of the flange profile and the side wall profile in the transition surface. The flange face is consistent with the flange profile in the transition face, and after being extended, it is connected with the end wrapping face to form a theoretical deep drawing model; Step 2: Construct a transition top surface model for a basin-shaped component: After removing the reinforcing holes and horseshoe marks from the theoretical deep-drawn model of the basin-shaped part, the surface is filled and offset by a distance equal to the thickness t of the basin-shaped part material in the direction of the theoretical outer surface of the basin-shaped part product model to form the transition top surface model of the basin-shaped part. Step 3: Obtain the blank size requirements based on the theoretical deep-drawing model, and generate a curvature blank with pre-drilled holes; Step 4: Based on the theoretical deep-drawing forming body model, manufacture the punch, blank holder, and die of the deep-drawing die. The working surface of the punch corresponds to the top surface of the transition surface of the theoretical deep-drawing forming body model, and the working surface of the blank holder corresponds to the flange surface of the theoretical deep-drawing forming body model. Draw the outline of the blank on the blank holder. The gap g between the working surface of the die and the corresponding part of the blank holder is designed according to the formula g = 1.1 × t. Step 5: Based on the transition top surface model of the basin-shaped part, manufacture the ejector of the deep drawing die. The working surface of the ejector corresponds to the transition top surface model of the basin-shaped part. The side of the ejector fits with the die cavity, and an "inverted T" shaped groove is set on the top. It is fixed to the upper template by bolts of the same structure. Step 6: Based on the theoretical deep-drawing model, manufacture the trimming die. The working surface of the trimming die corresponds to the theoretical deep-drawing model. Draw the outline of the multi-reinforced hole basin-shaped part and the outline of the reinforcing holes on the trimming die. Step 7: Make the blank according to the size requirements of the blank, make the pre-drilled holes for the reinforcing holes in the blank, and then pre-form the arc according to the curvature of the flange surface of the basin-shaped part to obtain the curvature blank with the pre-drilled holes. Step 8: Deep draw the curved blank with the pre-drilled hole on the deep drawing die to obtain the deep-drawn body; Step 9: Trim the deep-drawn part on the trimming die and remove the process allowance to obtain a thin-walled multi-reinforced hole basin-shaped part with shape tolerances that meet the design requirements.

2. The flexible bidirectional deep drawing method for thin-walled multi-reinforced hole basin-shaped parts according to claim 1, characterized in that, The transition fillet R1 in the transition wrapping surface is consistent with the theoretical fillet of the corresponding product outline position, and the transition fillet Rc on both sides is 2×R1.

3. The flexible bidirectional deep drawing method for thin-walled multi-reinforced hole basin-shaped parts according to claim 1, characterized in that, The transition fillet Rf between the end wrapping surface and the flange surface is consistent with the theoretical fillet at the corresponding transition surface position.

4. The flexible bidirectional deep drawing method for thin-walled multi-reinforced hole basin-shaped parts according to claim 1, characterized in that, Step 3: Obtain the blank size requirements based on the theoretical deep-drawn body model, and generate a curvature blank with pre-drilled holes. The specific process is as follows: 3-1: Design and unfold the blank The blank of the theoretical deep-drawn forming model of the basin-shaped part was calculated using the blank back calculation function of the finite element analysis software. 3-2: Design curvature blank Add a 15mm to 20mm process allowance around the above-mentioned unfolded blank size as the blank for cutting. The blank is designed with the curvature of the flange surface of the basin-shaped part, and is called the curvature blank. 3-3: Design of a curvature blank with pre-drilled holes Prepared holes of corresponding size are set on the curvature blank at the positions of the reinforcing holes in the digital model of the basin-shaped part, forming a curvature blank with prepared holes.

5. The flexible bidirectional deep drawing method for thin-walled multi-reinforced perforated basin-shaped parts according to claim 1, characterized in that, The ejector is made of polyurethane material to ensure the fit of the reinforcing hole to the mold after molding.

6. The flexible bidirectional deep drawing method for thin-walled multi-reinforced hole basin-shaped parts according to claim 1, characterized in that, Step 8: Deep drawing the curved blank with the pre-drilled hole into shape on the deep drawing die. The specific process is as follows: 8-1: Install the drawing die. Fix the upper template of the ejector to the double-acting hydraulic press using the inner slider. Similarly, fix the die to the double-acting hydraulic press using the outer slider. Apply lubricating oil to the contact area of ​​the curved blank with the pre-drilled hole, the die, the ejector, and the blank holder. Move the blank holder upwards to be flush with the top surface of the punch. Place the curved blank with the pre-drilled hole on the working surface of the blank holder according to the outline of the unfolded blank on the blank holder. The punch, die, blank holder, and ejector control the drawing direction using guide pillars. 8-2: At the start of forming, the ejector and die move downwards simultaneously until the die contacts the curved blank with the pre-drilled hole. The ejector stops moving, while the die and blank holder contact and clamp the curved blank with the pre-drilled hole and continue to move. Under the combined action of blank holder force and drawing force, the blank is drawn according to the working surface of the punch. The curved blank with the pre-drilled hole flows upwards to form a transitional drawn body. At this time, the ejector moves downwards and presses against the top surface of the punch. Under the action of covering pressure, a reinforcing hole is formed according to the punch surface, and finally the actual drawn body of the basin-shaped part is formed. 8-3: After the deep drawing process is completed, the die first moves upward with the upper die plate and separates from the actual deep-drawn basin-shaped part. Then the ejector moves away from the actual deep-drawn basin-shaped part, indicating that the entire forming process is over.

7. The flexible bidirectional deep drawing method for thin-walled multi-reinforced hole basin-shaped parts according to claim 1, characterized in that, Step 9: Remove the process allowance on the inner and outer sides of the actual deep drawing forming body of the basin-shaped part according to the outline of the part on the trimmed tire and the outline of the reinforcing hole, so as to obtain a thin-walled multi-reinforcing hole basin-shaped part with shape tolerances that meet the design requirements.

8. A flexible bidirectional deep drawing forming device for thin-walled, multi-reinforced, basin-shaped parts, characterized in that, Used to perform the method as described in any one of claims 1-7.

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