Multi-device adaptive three-action reverse drawing deep die for variable cross-section annular deep cavity piece

Abstract

The invention discloses a multi-device adaptive three-action reverse drawing die for a variable cross-section annular deep cavity part, which is at least suitable for drawing forming of two large double-action devices, and the three-action reverse drawing die designed based on the structures of the annular deep cavity part, a device I and a device II comprises an upper die assembly, a blank holder and a lower die, a shape-preserving ejection piece for providing a third action is arranged in the three-action reverse drawing die; the blank holder is arranged on the upper end face of the lower die. The shape-preserving ejector is placed in the middle of the lower die. A male die in the upper die assembly is installed in the blank holder and penetrates through the blank holder to be placed in the lower die, and the working face of the lower end of the male die is matched with the annular groove face to form a forming working face of the annular deep cavity piece. U-shaped notches and square notches which are symmetrically formed are formed in the two clamping sides of an upper die base connected to the top end of a male die, the two clamping sides of a blank holder and the two clamping sides of a lower die in the upper die assembly correspondingly, die-filling matching is achieved through the U-shaped notches and equipment I, and die-filling matching is achieved through square notch equipment II.

Description

Technical Field

[0001] The present invention relates to the field of, but is not limited to, aircraft manufacturing technology, and in particular to a multi-device adaptive three-motion reverse drawing die for a variable-section annular cavity. Background Art

[0002] In the aircraft manufacturing sector, the division of labor and collaboration among multiple OEMs in the development of key models is a guarantee for ensuring development milestones and reducing costs. Although the conventional processes of various OEMs are basically similar, they all have their own strengths. The purpose of division of labor and collaboration is to give full play to their respective advantages and minimize the waste of resources caused by the mismatch between product and equipment capabilities. After long-term accumulation in the industry, each OEM has selected special equipment that matches the capabilities of its main models and conventional products. Because small equipment cannot meet the processing requirements of large parts, large products classified by size can basically only be processed by large equipment, and large equipment is basically concentrated in a certain OEM, especially large molds that exceed the equipment table. There are very few domestic manufacturers that meet the production capacity. Once a major failure occurs in the special equipment used to produce parts, the model development faces the risk of interruption.

[0003] In the aircraft sheet metal manufacturing industry, mainstream large-scale double-action machines in China are available in two sizes, 2m x 2.5m and 2.2m x 3.3m, based on work surface size. The 2.2m x 3.3m machine also features two structural configurations: an intermediate ejector cylinder and a matrix ejector pin. Based on the machine's work surface, drawing dies with a width of 2.5m or less can be installed on the three aforementioned machine tools. However, traditional drawing dies lack the ability to accommodate multiple large machines simultaneously. For the processing of ultra-large specialty products, a major failure of the sole designated machine can severely hinder development progress. Therefore, for the forming of ultra-large specialty parts, fully optimizing the mold structure during process planning, mold design, and initial manufacturing stages to ensure it can accommodate multiple large machines simultaneously can avoid these issues. Summary of the Invention

[0004] The purpose of the present invention is: The present invention provides a multi-device adaptive three-motion reverse drawing die for variable-section annular deep cavity parts to solve the problem that traditional drawing dies are difficult to meet the mold compatibility requirements on multiple devices at the same time, thereby causing failures in designated processing equipment, which will seriously restrict the development progress of large parts to be processed.

[0005] The technical solution of the present invention is as follows: the present invention provides a multi-device adaptive three-action reverse drawing die for a variable-section annular deep cavity part, the reverse drawing die being suitable for deep drawing of at least two large double-action devices. The three-action reverse drawing die designed based on the structure of the annular deep cavity part 1, device I, and device II comprises: an upper die assembly 6, a blank holder 7, and a lower die 8. A shape-preserving top member 9 for providing a third action is provided in the three-action reverse drawing die; Wherein, the blank holder 7 is arranged on the upper end surface of the lower die 8, and the conformal top piece 9 is placed in the middle of the lower die 8, and an annular groove surface is formed by the inner profile of the lower die 8 and the upper outer surface of the conformal top piece 9 to match the working surface of the punch 11 in the upper die assembly 6; the punch 11 in the upper die assembly 6 is installed in the blank holder 7, and is placed in the lower die 8 through the blank holder 7, and the working surface of the lower end of the punch 11 matches the annular groove surface formed by the inner profile of the lower die 8 and the upper outer surface of the conformal top piece 9, forming a forming working surface of the annular deep cavity part 1; The two clamping sides of the upper die base 10 connected to the top of the punch 11 in the upper die assembly 6, the two clamping sides of the blank holder 7, and the two clamping sides of the lower die 8 are respectively provided with symmetrically arranged U-shaped notches 12 and square notches 13. The U-shaped notches 12 are used to achieve die matching with device I, and the square notches 13 are used to achieve die matching with device II. The ejection component on the workbench of the device I or the device II passes through the opening on the bottom plate of the lower mold 8 and is pressed against the bottom end surface of the conformal top member 9, thereby providing a third auxiliary conformal action through the conformal top member 9.

[0006] Optionally, in the multi-device adaptive three-motion reverse drawing die for the variable-section annular deep cavity part as described above, the spacing between the two clamping sides of the device I is smaller than the spacing between the two clamping sides of the device II, the ejector pins of the device I are distributed in an evenly spaced matrix on the work surface, and the ejector cylinder of the device II is located at the center of the work surface; The upper die assembly 6 includes: a punch 11, an upper die base 10 connected to the top surface of the punch 11; an annular boss provided on the lower end surface of the punch 11 serves as its working surface, and the working surface of the punch 11 matches the annular inner wall surface of the annular deep cavity 1. The tops of the two opposite clamping sides of the upper die base 10 are symmetrically provided with U-shaped notches 12 and square notches 13. The U-shaped notches 12 are used to match the die groove of the slider in the device I, and the square notches 13 are used to match the die groove of the slider in the device II. The upper die assembly 6 is connected to the bottom of the slider in the device I or the device II through the U-shaped notches 12 or the square notches 13. The blank holder 7 is configured as a ring-like structure with a stepped through hole 14 in the middle, which is used to install the punch 11 of the upper die assembly 6 through its stepped through hole 14, and limit the installation depth of the punch 11 in the blank holder 7 through the stepped surface; the top width of the two opposite clamping sides of the blank holder 7 is smaller than the bottom width, and the top width is ≤ the width of the outer slider of device I, and the tops of the two opposite clamping sides are symmetrically provided with U-shaped notches 12 and square notches 13, the U-shaped notches 12 are used to match the die groove of the outer slider of device I, and the square notches 13 are used to match the die groove of the outer slider of device II, and the blank holder 7 is connected to the bottom of the outer slider of device I or device II through the U-shaped notch 12 or the square notch 13; A bowl-shaped notch matching the outer ring wall 3 of the annular deep cavity 1 is provided in the middle of the upper end surface of the lower die 8, serving as a bowl-shaped working surface 15. A central circular hole 16 communicating with the bowl-shaped working surface 15 is provided at the lower portion of the bowl-shaped working surface 15. The bottom widths of the two opposite clamping sides of the lower die 8 are smaller than the top width, and the bottom width is ≤ the width of the worktable of device I. The bottoms of the two clamping sides are symmetrically provided with U-shaped notches 12 and square notches 13. The U-shaped notch is used to match the die groove of the worktable of device I, and the square notch is used to match the die groove of the worktable of device II. The lower die 8 is connected to the upper surface of the worktable of device I or device II via the U-shaped notch 12 or the square notch 13. The conformal top piece 9 is configured as a truncated cone structure with an annular concave surface around the top, and its annular concave surface matches the inner annular wall 2 of the annular deep cavity piece 1; the conformal top piece 9 is placed in the central circular hole 16 of the lower mold 8, and in the mold closing state, the annular concave surface of the conformal top piece 9 and the bowl-shaped working surface 15 of the lower mold 8 form an annular groove surface that matches the annular outer wall surface of the annular deep cavity piece 1, and the ejector rod in the workbench of equipment I or the ejector cylinder in the workbench of equipment II passes through the opening at the corresponding position of the bottom plate of the lower mold 8 and is pressed against the bottom end face of the conformal top piece 9 to provide it with an upward supporting force, thereby providing a third auxiliary conformal action.

[0007] Optionally, the multi-device adaptation of the variable cross-section annular deep cavity part as described above is in a three-motion reverse drawing die, In the upper die assembly 6, the outer dimensions of the working surface of the punch 11 are larger than the width and length of the inner hole of the outer slider of the equipment II; the outer dimensions of the upper die base 10 are smaller than the working surface of the punch 11, and the outer dimensions of the upper die base 10 are smaller than the width and length of the inner slider of the equipment I.

[0008] Optionally, in the above-mentioned variable cross-section annular deep cavity multi-device adaptation three-motion reverse drawing die, in the structure of the blank holder 7, The upper section of the stepped through hole 14 is larger than the maximum section of the punch 11, and the lower section of the stepped through hole 14 matches the maximum section of the punch 11; The two oppositely arranged clamping sides of the blank holder 7 and the lower die 8 are both configured as hollow reinforcement structures, each comprising a clamping plate 17, a bearing plate 18 arranged parallel to the clamping plate, and a plurality of connecting ribs 19 arranged between the clamping plate 17 and the bearing plate 18 for reinforcing rigidity. The top plate of the blank holder 7 is the clamping plate 17, and the bottom plate is the bearing plate 18; the top plate of the lower die 8 is the bearing plate 18, and the bottom plate is the clamping plate 17, and the bearing plate 18 of the blank holder 7 is butted against the bearing plate 18 of the lower die 8; The clamping plate 17 of the blank holder 7 is used to fasten the blank holder 7 to the outer slide of device I or device II, and the clamping plate 17 of the lower mold 8 is used to fasten the lower mold 8 to the work surface of device I or device II.

[0009] Optionally, the multi-device adaptation of the variable cross-section annular deep cavity part as described above is in a three-motion reverse drawing die, The U-shaped notches 12 and square notches 13 of the blank holder 7 and the lower die 8 respectively penetrate the corresponding clamping plates 17 in the thickness direction; the U-shaped notches 12 and square notches 13 are distributed on both sides of the connecting ribs 19, and the U-shaped notches 12 and square notches 13 are symmetrically distributed along the length direction of the work surface; The connecting ribs 19 between the blank holder 7 and the lower die 8 are distributed in groups at the same vertical position, and the spacing between the connecting ribs 19 in groups is unequal along the length direction of the work surface.

[0010] Optionally, the multi-device adaptation of the variable cross-section annular deep cavity part as described above is in a three-motion reverse drawing die, The upper die base 10 of the upper die assembly 6 is configured as a square structure, with four corners formed by chamfering to form chamfered planes; a guide plate 20 corresponding to the position of the chamfered plane is provided on the upper portion of the stepped through hole 14 of the blank holder 7, and is used to prevent relative rotational dislocation between the upper die assembly 6 and the blank holder 7 through the chamfered plane and the guide plate 20 after the blank holder 7 is installed in the upper die assembly 6; The two opposite guide sides of the blank holder 7 are provided with guide bosses 21, and the two opposite guide sides of the lower die 8 are provided with guide grooves 22 for matching with the guide bosses 21, and the guide bosses 21 and the guide grooves 22 are asymmetrically distributed along the width direction of the work surface; The bottom end surface of the conformal top piece 9 is provided with a plurality of guide holes 24, and the bottom plate of the lower mold 8 is provided with guide columns 23 that match the guide holes 24 of the conformal top piece 9, which are used to insert the guide columns 23 on the bottom plate of the lower mold 8 into the guide holes 24 at corresponding positions in the conformal top piece 9 to position and connect the conformal top piece 9.

[0011] Optionally, the multi-device adaptation of the variable cross-section annular deep cavity part as described above is in a three-motion reverse drawing die, The bottom plate of the lower mold 8 is provided with a push rod through hole 25 and a center through hole 26. The push rod through hole 25 matches the push rod position of the working surface of equipment I, and the center through hole 26 matches the ejection cylinder of the working surface of equipment II.

[0012] Optionally, the multi-device adaptation of the variable cross-section annular deep cavity part as described above is in a three-motion reverse drawing die, Two groups of lifting positioning holes for use in pairs are provided on the bottom plate of the lower mold 8, and the lifting positioning holes are in the shape of a trumpet with an opening facing downward; wherein, the first pair of positioning holes 27 matches the position of the positioning pins of the workbench of equipment I, and the second pair of positioning holes 28 matches the position of the positioning pins of the workbench of equipment II; the center lines of the first pair of positioning holes 27 and the second pair of positioning holes 28 intersect with each other, and the spacing between the two positioning holes in the first pair of positioning holes 27 is not equal to the spacing between the two positioning holes in the second pair of positioning holes 28.

[0013] Optionally, in the multi-device adaptation three-action reverse drawing die of the variable-section annular deep cavity part as described above, in the lower film 8, the upper straight hole section of each hole in the first pair of positioning holes 27 and the second pair of positioning holes 28 is larger than the positioning pins used in device I and device II, respectively; the width of the U-shaped notch 12 and the square notch 13 of the lower film 8 is larger than the width of the die slot of device I and device II, respectively; The matching clearance between the first pair of positioning holes 27 and the positioning pins of device I is less than 1 / 2 of the width difference between the U-shaped notch 12 and the mold groove of device I; the matching clearance between the second pair of positioning holes 28 and the positioning pins of device II is less than 1 / 2 of the width difference between the square notch 13 and the mold groove of device II.

[0014] Optionally, in the multi-device adapter three-motion reverse drawing die of the variable-section annular deep cavity part as described above, the outer contours of the blank holder 7 and the lower die 8 are polygonal structures with unequal side lengths, and the outer contours of the lower end face of the blank holder 7 and the upper end face of the lower die 8 match each other.

[0015] The beneficial effects of the present invention are as follows: the present invention provides a multi-device adaptive three-action reverse drawing die for a variable-section annular deep cavity part, the three-action reverse drawing die is suitable for at least two large-scale double-action devices for deep drawing. The structure of the multi-device adaptive three-action reverse drawing die provided by the present invention is designed based on the structure of the annular deep cavity part 1, device I, and device II. The three-action reverse drawing die includes: an upper die assembly 6, a blank holder 7, and a lower die 8, and a conformal top member 9 for providing a third action is provided in the three-action reverse drawing die. The multi-device adaptive three-action reverse drawing die provided by the embodiment of the present invention has the following beneficial effects: First, the multi-device adaptive three-action reverse drawing die provided by the present invention solves the problem of the mold simultaneously meeting the auxiliary action and quick-loading mold compatibility problems of the two devices by designing U-shaped notches and square notches, ejector rod through holes and center through holes that match the die slots of the two devices respectively; Second, the multi-device adaptable three-action reverse drawing die provided by the present invention overcomes the problem of oversized die components exceeding the equipment table for mold installation and use by designing die components with connection parts no larger than the corresponding equipment connection parts. In other words, it solves the problem of connecting oversized dies to equipment and further explores the engineering application potential of double-action drawing equipment for forming oversized parts. Third, the multi-device adaptive three-motion reverse drawing die provided by the present invention solves the problem of automatic positioning of the die and any equipment by designing asymmetrically distributed and cross-paired lifting positioning holes; Fourth, the multi-device adaptive three-action reverse drawing die provided by the present invention can be applied to at least two types of large-scale equipment, fully considering the incompatibility problem between the three-action reverse drawing die and the large-scale equipment, and can avoid the problem of production suspension caused by the failure of one type of equipment; Fifth, the multi-device adaptable three-action reverse drawing die provided by the present invention can not only meet the mold installation needs of multiple large-scale equipment at the same time, but also significantly improve the mold installation efficiency of large molds on any equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0017] Figure 1 Schematic diagram of the structure of the target semi-finished product of the variable-section annular deep cavity component according to an embodiment of the present invention; Figure 2 Schematic diagram of the structure of a semi-finished transition product of a variable-section annular deep cavity component according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the inner slider, outer slider, and workbench of the device II in an embodiment of the present invention; Figure 4 A schematic structural diagram of a multi-device adaptable three-motion reverse drawing die for a variable-section annular deep cavity component provided by an embodiment of the present invention; Figure 5 for Figure 4 A schematic structural diagram of an upper die assembly in a three-motion reverse drawing die adapted for multiple devices provided in the illustrated embodiment; Figure 6 for Figure 4 A schematic side elevation structural diagram of a blank holder in a three-motion reverse drawing die adapted for multiple devices provided in the illustrated embodiment; Figure 7 for Figure 4 A schematic diagram of the structure of the blank holder in the three-movement reverse drawing die adapted for multiple devices provided in the illustrated embodiment, viewed from the side; Figure 8 for Figure 4 A schematic side elevation structural diagram of a lower die in a three-motion reverse drawing die adapted for multiple devices provided in the illustrated embodiment; Figure 9 for Figure 4 The illustrated embodiment provides a schematic diagram of the structure of the lower die in a multi-device adaptive three-motion reverse drawing die as viewed from above.

[0018] Description of reference numerals: 1. Annular deep cavity part, 2. Inner annular wall, 3. Outer annular wall, 4. Transition semi-finished product, 5. Annular side wall, 6. Upper die assembly, 7. Blank holder, 8. Lower die, 9. Conformal top part, 10. Upper die base, 11. Punch, 12. U-shaped notch, 13. Square notch, 14. Step through hole, 15. Bowl-shaped working surface, 16. Center circular hole, 17. Clamping plate, 18. Load-bearing plate, 19. Connecting ribs, 20. Guide plate, 21. Guide boss, 22. Guide groove, 23. Guide column, 24. Guide hole, 25. Ejector rod through hole, 26. Center through hole, 27. First pair of positioning holes, 28. Second pair of positioning holes. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other in any manner.

[0020] First, the application requirements background of multi-device adaptation three-motion reverse drawing die for annular deep cavity parts is introduced.

[0021] Figure 1 The figure shows a semi-finished product of a variable cross-section annular deep cavity formed by reverse drawing of the leading edge aerodynamic lip skin of a large aircraft engine. It is one of the representative objects suitable for reverse drawing of the present invention. Its shape is approximately circular, and the annular deep cavity 1 of the variable cross-section shell structure is composed of an inner ring wall 2 and an outer ring wall 3 of varying heights. Figure 1 In the annular deep cavity component 1 shown, the inner annular wall 2 and the outer annular wall 3 are both relatively deep, and two or even multiple passes of deep drawing are necessary to meet the requirements of deep drawing deformation.

[0022] Reference Figure 2 A transitional semi-finished product 4 is pre-drawn to mate the annular sidewall 5 with the inner wall 2 of the annular deep cavity component 1. The outer wall 3 of the annular deep cavity component 1 is then reverse-drawn while the transitional semi-finished product 4 is in a conformal state. However, because the maximum profiles of the upper die assembly, blank holder, and lower die used for this integral reverse drawing die are larger than the inner slide, outer slide, and worktable of mainstream large-scale drawing equipment, very few manufacturers have the production capacity to meet this specialized product requirement. A major failure of the designated single piece of equipment would severely hinder development progress.

[0023] Secondly, the technical solution of multi-device adaptation of three-motion reverse drawing die for variable-section annular deep cavity parts provided by the present invention is introduced.

[0024] In order to overcome the problem that an ultra-large three-action reverse drawing die needs to be compatible with the molding functions of multiple mainstream large-scale equipment at the same time, and to improve the efficiency of molding when the mold parts exceed the molding table of the equipment; an embodiment of the present invention proposes a multi-equipment adaptive three-action reverse drawing die for variable-section annular deep cavity parts, in particular, an ultra-table large-scale drawing die suitable for deep cavity parts with an approximately circular shape to meet the molding needs of multiple equipment; by designing a three-action reverse drawing die with interchangeable and compatible functions on at least two equipment, the above-mentioned shortcomings of the ultra-table large-scale drawing die are overcome.

[0025] The present invention provides the following specific embodiments that can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments. The main technical solution of the multi-device adaptive three-motion reverse drawing die provided by the embodiment of the present invention is described as follows.

[0026] Reference Figures 3 to 9 The multi-device adaptive three-action reverse drawing die provided in an embodiment of the present invention is suitable for deep drawing using at least two large double-action devices. The spacing between the two clamping sides of device I is smaller than the spacing between the two clamping sides of device II. The ejector pins of device I are distributed in an evenly spaced matrix on the work surface, and the ejector cylinder of device II is located at the center of the work surface. The multi-device adaptive three-action reverse drawing die provided by the present invention is designed based on the structure of an annular deep cavity member 1, devices I, and devices II. The main structure of the multi-device adaptive three-action reverse drawing die includes: an upper die assembly 6, a blank holder 7, and a lower die 8; and a conformal ejector 9 for providing a third action is provided within the three-action reverse drawing die.

[0027] Reference Figure 4 As shown, in the multi-device adaptive three-motion reverse drawing die provided by an embodiment of the present invention, the blank holder 7 is arranged on the upper end surface of the lower die 8, and the conformal top piece 9 is placed in the middle of the lower die 8, and an annular groove surface for matching the working surface of the punch 11 in the upper die assembly 6 is formed by the inner surface of the lower die 8 and the upper outer surface of the conformal top piece 9; the punch 11 in the upper die assembly 6 is installed in the blank holder 7, and is placed in the lower die 8 through the blank holder 7, and the working surface of the lower end of the punch 11 matches the annular groove surface formed by the inner surface of the lower membrane 8 and the upper outer surface of the conformal top piece 9, forming a forming working surface of the annular deep cavity part 1.

[0028] In this embodiment of the present invention, the two clamping sides of the upper die holder 10 connected to the top of the punch 11 in the upper die assembly 6, the two clamping sides of the blank holder 7, and the two clamping sides of the lower die 8 are respectively provided with symmetrically arranged U-shaped notches 12 and square notches 13. The U-shaped notches 12 are used to achieve die matching with device I, while the square notches 13 are used to achieve die matching with device II. In addition, the ejector component on the workbench of device I or device II passes through the opening in the bottom plate of the lower die 8 and is pressed against the bottom end surface of the conformal top member 9, thereby providing a third auxiliary conformal action through the conformal top member 9.

[0029] Refer to the following Figures 3 to 9 , describing the specific structure of the multi-device adaptation three-motion reverse drawing die for the variable-section annular deep cavity part provided by an embodiment of the present invention.

[0030] Reference Figure 3 and Figure 5 As shown, the upper die assembly 6 in the embodiment of the present invention includes: a punch 11, and an upper die base 10 connected to the top surface of the punch 11. The annular boss provided on the lower end surface of the punch 11 serves as its working surface, and the working surface of the punch 11 matches the annular inner wall surface of the annular deep cavity component 1. The tops of the two opposite clamping sides of the upper die base 10 are symmetrically provided with U-shaped slots 12 and square slots 13. The U-shaped slot 12 is used to match the die groove of the slider in device I, and the square slot 13 is used to match the die groove of the slider in device II. The upper die assembly 6 is connected to the bottom of the slider in device I or device II through the U-shaped slot 12 or the square slot 13.

[0031] Reference Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, the blank holder 7 in the embodiment of the present invention is configured as a ring-like structure with a stepped through hole 14 in the middle, which is used to install the punch 11 of the upper mold assembly 6 through its stepped through hole 14, and limit the installation depth of the punch 11 in the blank holder 7 through the stepped surface. The top width of the two opposite clamping sides of the blank holder 7 is smaller than the bottom width, and the top width is ≤ the width of the outer slider of device I, and symmetrically arranged U-shaped notches 12 and square notches 13 are provided on the tops of the two opposite clamping sides. The U-shaped notch 12 is used to match the die groove of the outer slider of device I, and the square notch 13 is used to match the die groove of the outer slider of device II, so that the blank holder 7 is connected to the bottom of the outer slider of device I or device II through the U-shaped notch 12 or the square notch 13.

[0032] Reference Figure 3 、 Figure 4 、 Figure 8 and Figure 9 As shown, a bowl-shaped notch matching the outer ring wall 3 of the annular deep cavity 1 is provided in the middle of the upper end face of the lower die 8 in the embodiment of the present invention, serving as a bowl-shaped working surface 15. A central circular hole 16 communicating with the bowl-shaped working surface 15 is provided at the lower portion of the bowl-shaped working surface 15. The bottom widths of the two opposing clamping sides of the lower die 8 are smaller than the top width, and the bottom width is ≤ the width of the worktable of Equipment I. The bottoms of the two clamping sides are symmetrically provided with U-shaped notches 12 and square notches 13. The U-shaped notch is used to match the die slot of the worktable of Equipment I, and the square notch is used to match the die slot of the worktable of Equipment II. The lower die 8 is connected to the upper surface of the worktable of Equipment I or Equipment II via the U-shaped notch 12 or the square notch 13.

[0033] Reference Figure 4 and Figure 8As shown, the conformal top piece 9 in the embodiment of the present invention is configured as a truncated cone structure with an annular concave surface around the top, and its annular concave surface matches the shape surface of the inner ring wall 2 of the annular deep cavity part 1; the conformal top piece 9 is placed in the central circular hole 16 of the lower mold 8, and in the mold closing state, the annular concave surface of the conformal top piece 9 and the bowl-shaped working surface 15 of the lower mold 8 form an annular groove surface that matches the annular outer wall surface of the annular deep cavity part 1, and the ejector rod in the workbench of device I or the ejector cylinder in the workbench of device II passes through the opening at the corresponding position of the bottom plate of the lower mold 8 and is pressed against the bottom end face of the conformal top piece 9 to provide it with an upward supporting force, thereby providing a third auxiliary conformal action.

[0034] In one implementation of the embodiment of the present invention, referring to Figures 3 to 5 As shown, in the upper die assembly 6, the working surface dimensions of the punch 11 are larger than the inner width and length of the outer slide of the larger device (i.e., Device II) that the three-action reverse drawing die is adapted for. To ensure that the upper die assembly 6 can be mounted on the slides of both devices, the outer dimensions of the upper die holder 10 must be smaller than the working surface of the punch 11. Furthermore, the outer dimensions of the upper die holder 10 must be smaller than the inner width and length of the slide of the smaller device (i.e., Device I) that the three-action reverse drawing die is adapted for. In other words, the upper die assembly 6 is preferably mounted on the smaller device (i.e., Device I).

[0035] In one implementation of the embodiment of the present invention, referring to the attached Figures 4 to 9 As shown, in the structure of the blank holder 7 , the upper cross-section of the stepped through hole 14 is larger than the maximum cross-section of the punch 11 , and the lower portion of the stepped through hole 14 matches the maximum cross-section of the punch 11 .

[0036] In this implementation, the two clamping sides arranged opposite to each other in the blank holder 7 and the lower die 8 are both configured as hollow reinforcement structures, which respectively include a clamping plate 17, a bearing plate 18 arranged parallel to the clamping plate, and a plurality of connecting ribs 19 arranged between the clamping plate 17 and the bearing plate 18 for reinforcing rigidity. The top plate of the blank holder 7 is the clamping plate 17, and the bottom plate is the bearing plate 18; the top plate of the lower die 8 is the bearing plate 18, and the bottom plate is the clamping plate 17, and the bearing plate 18 of the blank holder 7 is docked with the bearing plate 18 of the lower die 8. The above-mentioned structural arrangement in the blank holder 7 and the lower die 8 has one purpose of using the clamping plates 17 in the hollow areas on both sides to reduce the clamping width range of the die; the second purpose is to use the bearing plates 18 in the hollow areas on both sides to increase the bearing width range of the die, and ultimately to maximize the potential of the equipment to form large-size parts.

[0037] In this implementation, the clamping plate 17 of the blank holder 7 is used to fasten the blank holder 7 to the outer slide of device I or device II, and the clamping plate 17 of the lower mold 8 is used to fasten the lower mold 8 to the work surface of device I or device II. By designing the clamping plate 17 and making it significantly smaller than the bearing plate 18, the problem of mold installation between an oversized blank holder 7 and the outer slide of the device can be solved.

[0038] In one implementation of the embodiment of the present invention, referring to Figures 6 to 9 As shown, the U-shaped notches 12 and square notches 13 of the blank holder 7 and the lower die 8 respectively penetrate the corresponding clamping plates 17 in the thickness direction; and the U-shaped notches 12 and square notches 13 are distributed on both sides of the connecting ribs 19, and the U-shaped notches 12 and square notches 13 are symmetrically distributed along the length direction of the work surface. In addition, the connecting ribs 19 of the blank holder 7 and the lower die 8 in this implementation are distributed in groups at the same vertical position, and the spacing of the grouped connecting ribs 19 along the length direction of the work surface is unequal. In this implementation, the above-mentioned structural arrangement in the blank holder 7 and the lower die 8 is intended to avoid interference between the clamping position adapted for any of the devices and the connecting ribs 19, and to avoid the problem of insufficient bearing stiffness caused by the blank holder 7 exceeding the outer slider of device I or device II.

[0039] In one implementation of the embodiment of the present invention, in order to achieve error-proofing in the use of a mold for a highly approximate circular ring product, problems such as reverse installation, relative rotation, and wrong installation of the mold are avoided when the mold is used.

[0040] Reference Figures 4 to 6 As shown, the upper die base 10 of the upper die assembly 6 in this embodiment is configured as a square structure, with the four corners being cut to form a chamfered plane. Accordingly, a guide plate 20 corresponding to the position of the chamfered plane is provided on the upper portion of the stepped through hole 14 of the blank holder 7. After the blank holder 7 is installed in the upper die assembly 6, the chamfered plane and the guide plate 20 prevent relative rotational misalignment between the upper die assembly 6 and the blank holder 7.

[0041] Reference Figure 4 、 Figures 6 to 9 In this embodiment, two opposite guide sides of the pressure ring 7 are provided with guide bosses 21, and two opposite guide sides of the lower mold 8 are provided with guide grooves 22 for matching with the guide bosses 21, and the guide bosses 21 and the guide grooves 22 are asymmetrically distributed along the width direction of the work table.

[0042] Reference Figure 4 , Figure 8 and Figure 9 As shown, the bottom end surface of the conformal top piece 9 in this embodiment is provided with a plurality of guide holes 24, and the bottom plate of the lower mold 8 is provided with guide columns 23 that match the guide holes 24 of the conformal top piece 9, which are used to insert the guide columns 23 on the bottom plate of the lower mold 8 into the guide holes 24 at corresponding positions in the conformal top piece 9 to position and connect the conformal top piece 9.

[0043] In one implementation of the embodiment of the present invention, referring to Figure 4 , Figures 8 to 9As shown, the bottom plate of lower mold 8 is provided with a push rod through hole 25 and a center through hole 26. Push rod through hole 25 matches the position of the push rod on the work surface of device I, while center through hole 26 matches the ejector cylinder on the work surface of device II. The purpose of this structural arrangement is to ensure that both devices with different support methods can provide a third auxiliary conformal action for conformal ejector 9.

[0044] In one implementation of the embodiment of the present invention, in order to avoid the erroneous use of any one of the devices in the three-motion reverse drawing die due to the multi-device adaptation. Figure 4 and Figure 9 As shown, the bottom plate of the lower mold 8 is provided with two pairs of lifting positioning holes, each shaped like a trumpet with its opening facing downward. The first pair of positioning holes 27 aligns with the positioning pins on the workbench of Equipment I, while the second pair of positioning holes 28 aligns with the positioning pins on the workbench of Equipment II. In this implementation, the center lines connecting the first pair of positioning holes 27 and the second pair of positioning holes 28 intersect, and the spacing between the two positioning holes in the first pair of positioning holes 27 is unequal to the spacing between the two positioning holes in the second pair of positioning holes 28.

[0045] In a specific implementation of this implementation, after the three-movement reverse drawing die is lifted and positioned on the workbench, the positioning efficiency of the three-movement reverse drawing die in any one of the devices is improved. Figure 9 In the lower film 8 shown, the upper straight sections of each of the first pair of positioning holes 27 and the second pair of positioning holes 28 are larger than the positioning pins used in Devices I and II, respectively. Furthermore, the widths of the U-shaped notch 12 and the square notch 13 of the lower film 8 are larger than the widths of the mold slots of Devices I and II, respectively. In this specific embodiment, the matching clearance between the first pair of positioning holes 27 and the positioning pins of Device I is less than 1 / 2 of the difference in width between the U-shaped notch 12 and the mold slot of Device I. Furthermore, the matching clearance between the second pair of positioning holes 28 and the positioning pins of Device II is less than 1 / 2 of the difference in width between the square notch 13 and the mold slot of Device II.

[0046] In this specific embodiment, the advantage of the above-mentioned structural arrangement is that: when loading the mold, the lower mold 8 is fixed to the working surface of equipment I or equipment II by positioning pins, and under the guiding action, the U-shaped groove 12 or square groove 13 on the upper mold assembly 6, the pressure ring 7, and the lower mold 8 automatically matches the matching position of the inner slider, the outer slider, and the mold loading groove of the workbench of equipment I or equipment II, and the U-shaped groove 12 or the square groove completely envelops the mold loading groove of equipment I or equipment II.

[0047] In one implementation of the embodiment of the present invention, in order to further reduce the difficulty of error-proofing during the use of the mold used for the part that is highly similar to a ring. Figures 4 to 9As shown, the outer contours of the blank holder 7 and the lower die 8 are polygonal structures with unequal side lengths, and the outer contours of the lower end face of the blank holder 7 match the outer contours of the upper end face of the lower die 8. The purpose of the structural arrangement in this implementation is: by adopting an unequal polygonal structure, any mold component and equipment have clear directional matching requirements for use, and the matching of mold component contours can be used to promptly detect mold installation errors, avoiding incorrect installation and use problems such as reverse installation and rotation.

[0048] The present invention provides a multi-device adaptive three-action reverse drawing die for variable-section annular deep cavity parts. The reverse drawing die is suitable for deep drawing of at least two large-scale double-action devices with different clamping ranges and structures, including an upper die assembly, a pressure ring, and a lower die with a contour larger than the corresponding connecting parts of any of the devices, and a conformal top part built into the reverse drawing die for providing a third auxiliary action; by designing mold components with connection parts ≤ the corresponding parts of the smaller device, the basic requirement of super-large molds meeting at least two devices for molding is solved; by designing lifting positioning holes with asymmetrical distribution and cross-paired combination, the problem of automatic positioning of the mold during lifting with any device is solved; by designing U-shaped notches and square notches, push rod through holes and center through holes that match the molding grooves of the two devices respectively, the problem of the mold meeting the auxiliary actions provided by two devices and the compatibility of quick molding is solved; the drawing die provided by the present invention can not only meet the molding use of multiple large devices at the same time, but also significantly improve the molding efficiency of large molds on any device.

[0049] Although the embodiments disclosed herein are as described above, the contents are merely provided to facilitate understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art may make any modifications and variations in the form and details of the embodiments without departing from the spirit and scope of the present invention. However, the scope of patent protection of the present invention shall remain subject to the scope defined by the appended claims.

Claims

1. A multi-device adaptable three-action reverse drawing die for variable cross-section annular deep cavity parts, characterized in that: The reverse drawing die is suitable for deep drawing of at least two large double-action devices. The three-action reverse drawing die designed based on the structure of the annular deep cavity part (1), device I, and device II comprises: an upper die assembly (6), a blank holder (7), and a lower die (8). A shape-preserving top part (9) for providing a third action is provided in the three-action reverse drawing die. Wherein, the pressure ring (7) is arranged on the upper end surface of the lower mold (8), and the conformal top piece (9) is placed in the middle of the lower mold (8), and an annular groove surface for matching with the working surface of the punch (11) in the upper mold assembly (6) is formed by the inner surface of the lower mold (8) and the upper outer surface of the conformal top piece (9); the punch (11) in the upper mold assembly (6) is installed in the pressure ring (7), and is placed in the lower mold (8) through the pressure ring (7), and the working surface of the lower end of the punch (11) matches the annular groove surface formed by the inner surface of the lower mold 8 and the upper outer surface of the conformal top piece (9), forming a forming working surface of the annular deep cavity part (1); The two clamping sides of the upper die base (10) connected to the top of the punch (11) in the upper die assembly (6), the two clamping sides of the blank holder (7), and the two clamping sides of the lower die (8) are respectively provided with symmetrically arranged U-shaped notches (12) and square notches (13), and die matching is achieved with device I through each U-shaped notch (12), and die matching is achieved with device II through each square notch (13); The ejection component on the workbench of the device I or the device II passes through the opening on the bottom plate of the lower mold 8 and is pressed against the bottom end surface of the conformal top member 9, thereby providing a third auxiliary conformal action through the conformal top member 9.

2. The multi-device adaptable three-motion reverse drawing die for variable cross-section annular deep cavity parts according to claim 1, characterized in that: The distance between the two clamping sides of the device I is smaller than the distance between the two clamping sides of the device II. The ejector rods of the device I are distributed in an evenly spaced matrix on the work surface, and the ejector cylinder of the device II is located in the center of the work surface. The upper die assembly (6) comprises: a punch (11), an upper die seat (10) connected to the top end surface of the punch (11); an annular boss provided on the lower end surface of the punch (11) serves as its working surface, the working surface of the punch (11) matches the annular inner wall surface of the annular deep cavity (1), and two opposite clamping side tops of the upper die seat (10) are provided with symmetrically arranged U-shaped notches (12) and square notches (13), and the upper die assembly (6) is connected to the bottom of the slider in the device I or the device II through the U-shaped notches (12) or the square notches (13); The blank holder (7) is configured as a ring-like structure having a stepped through hole (14) in the middle thereof, and is used for inserting the punch (11) of the upper die assembly (6) through the stepped through hole (14) thereof, and limiting the insertion depth of the punch (11) in the blank holder (7) through the stepped surface; the top widths of the two opposite clamping sides of the blank holder (7) are smaller than the bottom width, and the top widths are ≤ the width of the outer slider of device I, and the tops of the two opposite clamping sides are provided with symmetrically arranged U-shaped notches (12) and square notches (13), and the blank holder (7) is connected to the bottom of the outer slider of device I or device II through the U-shaped notches (12) or the square notches (13); A bowl-shaped notch matching the outer ring wall (3) of the annular deep cavity (1) is provided in the middle of the upper end surface of the lower die (8), serving as a bowl-shaped working surface (15), and a central circular hole (16) communicating with the bowl-shaped working surface (15) is provided at the lower portion of the bowl-shaped working surface (15); the bottom widths of the two opposite clamping sides of the lower die (8) are smaller than the top width, and the bottom widths are ≤ the width of the workbench of device I, and the bottoms of the two clamping sides are provided with symmetrically arranged U-shaped notches (12) and square notches (13), and the lower die (8) is connected to the upper surface of the workbench of device I or device II via the U-shaped notches (12) or the square notches (13); The conformal top piece (9) is configured as a truncated cone structure having an annular concave surface around the top, and the annular concave surface matches the inner ring wall (2) of the annular deep cavity piece (1); the conformal top piece (9) is placed in the central circular hole (16) of the lower mold (8), and in the mold closing state, the annular groove surface formed by the annular concave surface of the conformal top piece (9) and the bowl-shaped working surface 15 of the lower mold (8) match the annular outer wall surface of the annular deep cavity piece (1). The ejector rod in the workbench of the device I or the ejector cylinder in the workbench of the device II passes through the opening at the corresponding position of the bottom plate of the lower mold (8) and is pressed against the bottom end surface of the conformal top piece (9) to provide it with an upward supporting force, thereby providing a third auxiliary conformal action.

3. The multi-device adaptable three-motion reverse drawing die for variable cross-section annular deep cavity parts according to claim 2, characterized in that: In the upper die assembly (6), the outer dimensions of the working surface of the punch (11) are larger than the width and length of the inner hole of the outer slider of the device II; the outer dimensions of the upper die base (10) are smaller than the working surface of the punch (11), and the outer dimensions of the upper die base (10) are smaller than the width and length of the inner slider of the device I.

4. The multi-device adaptable three-motion reverse drawing die for a variable cross-section annular deep cavity component according to claim 2, characterized in that: In the structure of the blank holder (7), The upper cross-section of the stepped through hole (14) is larger than the maximum cross-section of the punch (11), and the lower portion of the stepped through hole (14) matches the maximum cross-section of the punch (11); The two clamping sides arranged opposite to each other in the blank holder (7) and the lower die (8) are both arranged as hollow reinforcement structures, respectively including a clamping plate (17), a bearing plate (18) arranged parallel to the clamping plate, and a plurality of connecting ribs (19) arranged between the clamping plate (17) and the bearing plate (18) for reinforcing rigidity, and the bearing plate (18) of the blank holder (7) is butted against the bearing plate (18) of the lower die (8); The clamping plate (17) of the blank holder (7) is used to fasten the blank holder (7) to the outer slide of the device I or the device II, and the clamping plate (17) of the lower die (8) is used to fasten the lower die (8) to the working table of the device I or the device II.

5. The multi-device adaptable three-motion reverse drawing die for variable cross-section annular deep cavity parts according to claim 4, characterized in that: The U-shaped notches (12) and the square notches (13) of the blank holder (7) and the lower die (8) respectively penetrate the corresponding clamping plates (17) in the thickness direction; the U-shaped notches (12) and the square notches (13) are distributed on both sides of the connecting ribs (19), and the U-shaped notches (12) and the square notches (13) are symmetrically distributed along the length direction of the work surface; The connecting ribs (19) between the blank holder (7) and the lower die (8) are distributed in groups at the same vertical position, and the spacing between the grouped connecting ribs (19) along the length direction of the work table is unequal.

6. A multi-device adaptable three-action reverse drawing die for forming a variable cross-section annular deep cavity part according to any one of claims 1 to 5, characterized in that: The upper die seat (10) of the upper die assembly (6) is configured as a square structure, with four corners formed by cutting corners to form cutting corner planes; a guide plate (20) corresponding to the position of the cutting corner plane is provided on the upper portion of the step through hole (14) of the blank holder (7), and is used to prevent relative rotational dislocation between the upper die assembly (6) and the blank holder (7) through the cutting corner plane and the guide plate (20) after the blank holder (7) is installed in the upper die assembly (6); Two opposite guide sides of the blank holder (7) are provided with guide bosses (21), and two opposite guide sides of the lower die (8) are provided with guide grooves (22) for matching with the guide bosses (21), and the guide bosses (21) and the guide grooves (22) are asymmetrically distributed along the width direction of the work surface; The bottom end surface of the conformal top member (9) is provided with a plurality of guide holes (24), and the bottom plate of the lower mold (8) is provided with guide posts (23) that match the guide holes (24) of the conformal top member (9), and are used to insert the guide posts (23) on the bottom plate of the lower mold (8) into the guide holes (24) at corresponding positions in the conformal top member (9) to position and connect the conformal top member (9).

7. The multi-device adaptable three-motion reverse drawing die for a variable cross-section annular deep cavity component according to any one of claims 1 to 5, characterized in that: A push rod through hole (25) and a center through hole (26) are provided on the bottom plate of the lower mold (8), wherein the push rod through hole (25) matches the push rod position of the working table of the device I, and the center through hole (26) matches the ejection cylinder of the working table of the device II.

8. The multi-device adaptable three-motion reverse drawing die for a variable cross-section annular deep cavity component according to any one of claims 1 to 5, characterized in that: Two groups of lifting positioning holes for use in pairs are provided on the bottom plate of the lower mold (8), and the lifting positioning holes are in the shape of a trumpet with an opening facing downward; wherein the first pair of positioning holes (27) matches the position of the positioning pins of the workbench of equipment I, and the second pair of positioning holes (28) matches the position of the positioning pins of the workbench of equipment II; the center lines of the first pair of positioning holes (27) and the second pair of positioning holes (28) intersect with each other, and the spacing between the two positioning holes in the first pair of positioning holes (27) is not equal to the spacing between the two positioning holes in the second pair of positioning holes (28).

9. The multi-device adaptable three-motion reverse drawing die for a variable cross-section annular deep cavity component according to claim 8, characterized in that: In the lower film 8, the upper straight hole sections of each hole in the first pair of positioning holes (27) and the second pair of positioning holes (28) are respectively larger than the positioning pins used in equipment I and equipment II; the widths of the U-shaped notch (12) and the square notch (13) of the lower film 8 are respectively larger than the widths of the die slots of equipment I and equipment II; The matching clearance between the first pair of positioning holes (27) and the positioning pins of device I is less than 1 / 2 of the width difference between the U-shaped notch (12) and the die slot of device I; the matching clearance between the second pair of positioning holes (28) and the positioning pins of device II is less than 1 / 2 of the width difference between the square notch (13) and the die slot of device II.

10. The multi-device adaptable three-motion reverse drawing die for a variable cross-section annular deep cavity component according to any one of claims 1 to 5, characterized in that: The outer contours of the pressure ring (7) and the lower die (8) are polygonal structures with unequal side lengths, and the outer contours of the lower end face of the pressure ring (7) and the upper end face of the lower die (8) match each other.

Images