Double-cone curvature pressing die and plate pressing method

Abstract

The present invention discloses a double-conical curvature pressing mold and a plate pressing method. The double-conical curvature pressing mold includes an upper mold and a lower mold. The upper mold support base frame of the upper mold is fixedly mounted on the upper mold base. The upper mold contact panel is fixedly mounted on the upper mold support base frame and is in contact with the surface of the upper mold support base frame away from the upper mold base, forming a convex surface that protrudes in a direction away from the upper mold support base frame. The lower mold support base frame of the lower mold is fixedly mounted on the lower mold base. The lower mold contact panel is fixedly mounted on the lower mold support base frame and is in contact with the surface of the lower mold support base frame away from the lower mold base, forming a concave surface that is recessed in a direction toward the upper mold support base frame. The convex surface of the upper mold contact panel matches the concave surface of the lower mold contact panel. The present invention solves the technical problem in the prior art of being unable to achieve one-piece molding processing for complex linear processing, gradual linear curvature changes, and special metal structures.

Description

Technical Field

[0001] The invention relates to the technical field of shell plate manufacturing, and in particular to a double-conical curvature pressing die and a plate pressing method. Background Art

[0002] During shipbuilding, hull plates with linear shapes are typically processed using both hot working and cold working techniques. Hot working can handle complex hull plates and flexibly handles a wide range of hull plate shapes without the need for equipment. However, this method is relatively dependent on personnel skills, has a low degree of mechanization, suffers from low processing efficiency, and is susceptible to damage to the metallographic structure and mechanical properties. Cold working, assisted by heavy machinery, uses a universal punch tool to extrude the plate into the desired shape. Its advantages are high forming efficiency and no change to the hull plate's metallographic structure. However, the universal punch tool is currently limited to processing hull plates with a single linear shape. When processing complex hull plates, the plates must be pressed in multiple equal sections. This means the plates are assembled from two or three smaller hull plates, which inevitably compromises the plate's aesthetic appearance. Therefore, the universal punch tool is not suitable for the integrated processing of complex linear hull plates.

[0003] In summary, how to form a complex linear shell plate to solve the technical difficulties in the existing technology that cannot be achieved in one-piece molding due to complex linear processing, gradual linear curvature, and special metal structure urgently needs to be solved by technical personnel in this field. Summary of the Invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a double-conical curvature pressing die and a plate pressing method to solve the technical difficulties in the prior art that the processing linearity is complex, the linear curvature is gradually changed, and the metal structure is special and cannot be achieved through one-piece molding. The one-piece molding of the special steel double-conical curvature shell plate is achieved, and the workpiece produces plastic deformation during the pressing process and meets the performance of the workpiece's appearance linearity and internal metal structure.

[0005] In order to achieve the above-mentioned and other related purposes, the present invention provides a double-conical curvature pressing die, comprising an upper die and a lower die, wherein the upper die comprises:

[0006] Upper mold base;

[0007] The upper mold support base frame is fixedly arranged on the upper mold base;

[0008] The upper mold contact panel is fixed on the upper mold support base frame and is in contact with the surface of the upper mold support base frame away from the upper mold base, forming a convex surface protruding in a direction away from the upper mold support base frame;

[0009] The lower mold includes:

[0010] Lower mold base;

[0011] The lower mold support base frame is fixedly arranged on the lower mold base;

[0012] The lower mold contact panel is fixed on the lower mold support base frame and is in contact with the surface of the lower mold support base frame away from the lower mold base, forming a concave surface that is concave in the direction toward the upper mold support base frame;

[0013] The convex surface of the upper mold contact panel matches the concave surface of the lower mold contact panel.

[0014] Optionally, the lower mold contact panel includes a first fan-shaped plane area, a first curvature area, a second curvature area and a third curvature area. The first curvature area, the second curvature area and the third curvature area are respectively closely connected with the fan-shaped plane area along the arc line of the fan-shaped edge of the fan-shaped plane area, and the first curvature area and the second curvature area are connected with each other, and the second curvature area and the third curvature area are connected with each other.

[0015] Optionally, the first curvature region is a gradual transition region with a curvature radius from 0 mm to 100 mm, the second curvature region is a gradual transition region with a curvature radius from 100 mm to 300 mm, and the third curvature region is a gradual transition region with a curvature radius from 300 mm to 500 mm.

[0016] Optionally, the upper mold contact panel includes a second fan-shaped plane area, a fourth curvature area, a fifth curvature area and a sixth curvature area. The fourth curvature area, the fifth curvature area and the sixth curvature area are respectively closely connected with the second fan-shaped plane area along the arc line of the fan-shaped edge of the second fan-shaped plane area, and the fourth curvature area and the fifth curvature area are connected with each other, and the fifth curvature area and the sixth curvature area are connected with each other.

[0017] Optionally, the fourth curvature area of the upper mold contact panel corresponds to the first curvature area of the lower mold contact panel; the fifth curvature area of the upper mold contact panel corresponds to the second curvature area of the lower mold contact panel; and the sixth curvature area of the upper mold contact panel corresponds to the third curvature area of the lower mold contact panel.

[0018] Optionally, the fourth curvature area of the upper mold contact panel has the same curvature radius as the first curvature area of the lower mold contact panel, the fifth curvature area of the upper mold contact panel has the same curvature radius as the second curvature area of the lower mold contact panel, and the sixth curvature area of the upper mold contact panel has the same curvature radius as the third curvature area of the lower mold contact panel.

[0019] Optionally, the lower mold support base frame includes:

[0020] The lower mold longitudinal base frame is fixedly arranged on the lower mold base and extends along the first direction on the lower mold base;

[0021] A plurality of lower mold transverse base frames are arranged on the lower mold longitudinal base frame at intervals along a first direction, and a single lower mold transverse base frame extends along a second direction, and the first direction is perpendicular to the second direction.

[0022] Optionally, a surface of each lower mold transverse base frame in contact with the lower mold contact panel is provided with a recess, and the recess gradually concave along the direction from the edge to the center of the lower mold transverse base frame to form a concave strip frame.

[0023] Optionally, the concavity of each lower mold transverse base frame is different.

[0024] Optionally, the upper mold support base frame includes:

[0025] The upper mold longitudinal base frame is fixedly arranged on the upper mold base and extends along the first direction on the upper mold base;

[0026] A plurality of upper mold transverse base frames are arranged on the upper mold longitudinal base frame at intervals along a first direction, and a single upper mold transverse base frame extends along a second direction, and the first direction and the second direction are perpendicular to each other.

[0027] A protrusion is provided on one side of each upper mold transverse base frame that contacts the upper mold contact panel. The protrusion gradually bulges upward from the edge to the center of the upper mold transverse base frame to form a convex strip frame.

[0028] Optionally, it also includes:

[0029] The base frame ring is arranged on both sides of the periphery of the plurality of lower mold transverse base frames along the first direction to connect the plurality of lower mold transverse base frames.

[0030] Optionally, it also includes:

[0031] The baffle extends along the second direction and connects the base frame circles on both sides.

[0032] Optionally, it also includes:

[0033] The triangular reinforcement plate is arranged along the first direction at the connection between the baffle and the lower mold base.

[0034] The present invention also provides a plate pressing method, comprising:

[0035] Provide a flat plate workpiece and determine the processing bearing center point of the flat plate workpiece;

[0036] The flat workpiece is placed in a pressing mold, which uses the above-mentioned double-cone curvature pressing mold. The flat workpiece is placed on the lower mold of the double-cone curvature pressing mold. The upper mold moves toward the lower mold until it contacts the flat workpiece, so that the contact point between the upper mold and the flat workpiece deviates from the processing center point. The deviation range of the contact point and the processing center point is a circular area with a radius of 100 mm and the processing center point as the center of the circle;

[0037] The upper die continues to move toward the lower die to perform preliminary pressing on the flat workpiece;

[0038] Perform edge correction on workpieces after initial pressing;

[0039] The edge-corrected workpiece is placed in a double-cone curvature pressing mold for secondary pressing and forming.

[0040] Optionally, when the flat workpiece is initially pressed, the longitudinal force angle of the mold is controlled to be 50 degrees, and the transverse force angle of the mold is controlled to be 40 degrees.

[0041] Compared with the prior art, the double-conical curvature pressing die and plate pressing method of the present invention have at least the following beneficial effects:

[0042] The double-conical curvature processing pressing mold of the present invention adopts a combination of multiple contact panels with varying curvatures and a mold base frame. By cooperating with a hydraulic press and utilizing downward pressure, special steel double-conical curvature processing parts are formed in one piece. This solves the problem of simultaneously meeting the requirements of the metal structure and integrated processing accuracy of the shell plate when processing complex linear shell plates, thereby avoiding the impact of material strength reduction and raw material cost return caused by the processing of special material processing parts, and laying a solid foundation for subsequent processing of similar complex linear shell plates.

[0043] The plate pressing method of the present invention can also achieve the above-mentioned effect by using the above-mentioned pressing mold for pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1a Schematic diagram of the structure of the double-cone pressing die described in an embodiment of the present invention;

[0045] Figure 1b 2. This is a front view of the double-cone pressing die according to an embodiment of the present invention;

[0046] Figure 1c 1 is a rear view of the double-cone pressing die according to an embodiment of the present invention;

[0047] Figure 2 Schematic diagram of an exploded view of the upper mold and the supporting base frame in the lower mold in the double-cone pressing mold according to an embodiment of the present invention;

[0048] Figure 3 Schematic diagram of the structure of the upper mold of the double-cone pressing mold according to an embodiment of the present invention;

[0049] Figure 4 Schematic diagram of the structure of the lower mold of the double-cone pressing mold according to an embodiment of the present invention;

[0050] Figure 5 A schematic structural diagram of the contact surface between a plate formed by pressing with the double-cone pressing die according to an embodiment of the present invention and a contact panel of a lower die;

[0051] Figure 6 Schematic diagram of the structure of the double-conical curvature pressing mold described in an embodiment of the present invention installed on a hydraulic press.

[0052] List of reference numerals:

[0053] 1 Hydraulic press

[0054] 2 hydraulic rods

[0055] 3. Mold fixing frame

[0056] 4 Upper mold base

[0057] 5 Upper mold longitudinal base frame

[0058] 6 Upper mold horizontal base frame

[0059] 7 Upper mold contact panel

[0060] 8 Lower mold base

[0061] 9 Lower mold longitudinal base frame

[0062] 10 Lower mold horizontal base frame

[0063] 11 Lower mold contact panel

[0064] 12 limit slots

[0065] 13 Upper die connection groove

[0066] 14 Lower die fixing slot

[0067] 15 Base frame circle

[0068] 16 triangular reinforcement plate

[0069] 17 hanging lugs

[0070] 18 baffle

[0071] a The first sector plane area

[0072] b First curvature area

[0073] c Second curvature area

[0074] d Third curvature area

[0075] a' the second sector plane area

[0076] b' Fourth curvature area

[0077] c' Fifth curvature area

[0078] d' Sixth curvature area DETAILED DESCRIPTION

[0079] The following specific embodiments illustrate the embodiments of the present invention. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features of the embodiments may be combined with each other unless they conflict.

[0080] It should be noted that the diagrams provided in the embodiments of the present invention are only schematic illustrations of the basic concept of the present invention. Although the diagrams only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation, the form, quantity, and proportion of each component in actual implementation can be changed at will, and the component layout form may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of this application. Therefore, they have no technical significance. Any structural modification, change in proportional relationship, or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose of the present invention.

[0081] Example 1

[0082] This embodiment provides a double-conical curvature pressing mold, which includes an upper mold and a lower mold. The upper mold includes an upper mold base, an upper mold support base frame, and an upper mold contact panel. The upper mold support base frame is fixedly mounted on the upper mold base. The upper mold contact panel is fixedly mounted on the upper mold support base frame and is in contact with the surface of the upper mold support base frame away from the upper mold base, forming a convex surface that protrudes away from the upper mold support base frame. The lower mold includes a lower mold base, a lower mold support base frame, and a lower mold contact panel. The lower mold support base frame is fixedly mounted on the lower mold base. The lower mold contact panel is fixedly mounted on the lower mold support base frame and is in contact with the surface of the lower mold support base frame away from the lower mold base, forming a concave surface that is recessed toward the upper mold support base frame. The convex surface of the upper mold contact panel matches the linear curvature of the concave surface of the lower mold contact panel.

[0083] Specifically, refer to Figures 1a-1c 、 Figure 2 The lower mold support base frame includes a lower mold longitudinal base frame 9 and multiple lower mold transverse base frames 10. The lower mold longitudinal base frame 9 is fixedly set on the lower mold base 8 and extends along the first direction on the lower mold base 8. Multiple lower mold transverse base frames 10 are arranged on the lower mold longitudinal base frame 9 at intervals along the first direction, and a single lower mold transverse base frame 10 extends along the second direction, and the first direction and the second direction are perpendicular to each other. There are multiple spaced limit grooves 12 on the side of the lower mold longitudinal base frame 9 away from the lower mold base 8, and each lower mold longitudinal base frame 9 is also provided with a limit groove 12. Multiple lower mold transverse base frames 10 are engaged with the limit grooves 12 of the lower mold longitudinal base frame 9 through their limit grooves 12, and the lower mold transverse base frame 10 is fixed at 90 degrees to the lower mold longitudinal base frame 9.

[0084] Optionally, the plurality of spaced limiting grooves 12 on the lower mold longitudinal base frame 9 are arranged at equal intervals. In addition, the width of the limiting grooves 12 on the lower mold transverse base frame 10 is consistent with the thickness of the plate of the lower mold longitudinal base frame 9, so as to facilitate the insertion and ensure the installation accuracy of the base frame.

[0085] Each lower mold transverse base frame 10 is provided with a concave surface on the side in contact with the lower mold contact panel 11. The concave surface gradually concave from the edge to the center of the lower mold transverse base frame 10, forming a concave strip frame. The degree of concave of each lower mold transverse base frame 10 is different, and the lower mold contact panel 11 fits tightly with the concave surface of each lower mold transverse base frame 10. Optionally, refer to Figure 1a A lower mold fixing groove 14 is provided on the lower mold base for forming a fixed connection with the pressing platform.

[0086] Reference Figures 1a-1c 、 Figure 2, the upper mold support base frame includes an upper mold longitudinal base frame 5 and a plurality of upper mold transverse base frames 6. The upper mold longitudinal base frame 5 is fixedly set on the upper mold base 4 and extends along the first direction on the upper mold base 4. A plurality of upper mold transverse base frames 6 are arranged on the upper mold longitudinal base frame 5 at intervals along the first direction, and a single upper mold transverse distance frame extends along the second direction. A plurality of limiting grooves 12 are arranged at intervals along the first direction on the side of the upper mold longitudinal base frame 5 away from the upper mold base 4, and each upper mold transverse base frame 6 is provided with a limiting groove 12, and a plurality of upper mold transverse base frames 6 are engaged with the limiting groove 12 of the upper mold longitudinal base frame 5 through its limiting groove 12. Optionally, the plurality of spaced limiting grooves 12 on the upper mold longitudinal base frame 5 are arranged at equal intervals. A protrusion is provided on the side of each upper mold transverse base frame 6 that contacts the upper mold contact panel 7, and the protrusion gradually convexes along the direction from the edge to the center of the upper mold transverse base frame 6 to form a convex strip frame. Optionally, referring to Figure 1a An upper mold connecting groove 13 is provided on the upper mold base 4. The upper mold connecting groove 13 is parallel to the upper mold transverse base frame 6 and is provided at the center position of the end face of the upper mold base 4 for forming a fixed connection with the mold fixing frame.

[0087] Optionally, the plurality of spaced limiting grooves 12 on the upper mold longitudinal base frame 5 are arranged at equal intervals. Furthermore, the width of the limiting grooves 12 on the upper mold transverse base frame 6 is consistent with the thickness of the plate of the upper mold longitudinal base frame 5, so as to facilitate insertion and ensure the installation accuracy of the base frame.

[0088] Reference Figure 1a , base frame rings 15 are further provided on both sides of the outer periphery of the lower mold transverse base frame 10 along the first direction, and the base frame rings 15 connect multiple lower mold transverse base frames 10 to strengthen the lower mold transverse base frame 10. Optionally, a baffle 18 is further provided on the lower mold transverse base frame 10, and the baffle 18 extends along the second direction and connects the ends of the base frame rings 15 on both sides. Optionally, referring to Figure 4 A plurality of triangular reinforcement plates 16 are also provided at the connection between the baffle 18 and the lower mold base. The triangular reinforcement plates 16 are distributed at the stress-bearing parts of the transverse base frame to further strengthen the supporting strength of the transverse base frame 10 of the lower mold.

[0089] Reference Figure 1aThe lower mold contact panel 11 is installed on the concave surface of the lower mold transverse base frame 10, and is consistent with the inclination amplitude of the concave of each lower mold transverse base frame 10 and is attached. The upper mold contact panel 7 is installed on the convex surface of the upper mold transverse base frame 6, and is consistent with the inclination amplitude of the convex surface of each upper mold transverse base frame 6 and is attached. The linear curvature of the upper mold contact panel 11 matches that of the lower mold contact panel 7. When the upper mold contact panel 7 and the lower mold contact panel 11 are tightly matched, the workpiece is tightly fitted between the curved surface of the upper mold contact panel 7 and the curved surface of the lower mold contact panel 11, and pressure is maintained during processing to effectively reduce the rebound of the workpiece after demolding, so as to ensure the linear shape and precision quality of the workpiece.

[0090] Specifically, the upper mold contact panel 7 or the lower mold contact panel 11 includes a plurality of curvature areas, and the upper mold contact panel 7 or the lower mold contact panel 11 is formed by connecting the plurality of curvature areas to each other. Figure 3 The multiple curvature areas of the lower mold contact panel 11 include a first sector plane area a, a first curvature area b, a second curvature area c, and a third curvature area d. The first curvature area b, the second curvature area c, and the third curvature area d are closely connected with the sector plane area along the arc line of the sector edge of the sector plane area a, and the first curvature area and the second curvature area are connected with each other, and the second curvature area and the third curvature area are connected with each other. Figure 5 The first curvature region b is a gradual transition zone with a curvature radius from 0 mm to 100 mm, the second curvature region c is a gradual transition zone with a curvature radius from 100 mm to 300 mm, and the third curvature region d is a gradual transition zone with a curvature radius from 300 mm to 500 mm, wherein the second curvature region c is an arc surface with a smooth transition between the first curvature region b and the third curvature region d.

[0091] Reference Figure 4The multiple curvature regions of the upper mold contact panel 7 include a second sector-shaped plane region a', a fourth curvature region b', a fifth curvature region c', and a sixth curvature region d'. The fourth curvature region b', the fifth curvature region c', and the sixth curvature region d' are respectively closely connected to the second sector-shaped plane region a' along the arc of the sector edge of the second sector-shaped plane region a'. The fourth curvature region b' and the fifth curvature region c' are connected to each other, and the fifth curvature region c' and the sixth curvature region d' are connected to each other. The second sector-shaped plane region a' of the upper mold contact panel 7 corresponds to the first sector-shaped plane region a of the lower mold contact panel. The fourth curvature region b' of the upper mold contact panel 7 corresponds to the first curvature region b of the lower mold contact panel 11; the fifth curvature region c' of the upper mold contact panel 7 corresponds to the second curvature region c of the lower mold contact panel 11; and the sixth curvature region d' of the upper mold contact panel 7 corresponds to the third curvature region d of the lower mold contact panel 11. The fourth curvature area b' of the upper mold contact panel 7 has the same curvature radius as the first curvature area b of the lower mold contact panel 11; the fifth curvature area c' of the upper mold contact panel 7 has the same curvature radius as the second curvature area c of the lower mold contact panel 11; the sixth curvature area d' of the upper mold contact panel 7 has the same curvature radius as the third curvature area d of the lower mold contact panel 11.

[0092] Optionally, the end surface of the upper mold contact panel 7 or the lower mold contact panel 11 is provided with a rounded corner with an arc greater than 90° to prevent damage to the inner and outer surfaces of the plate during the pressing process.

[0093] Optionally, refer to Figure 1a The upper mold and the lower mold are also provided with lifting ears 17 for lifting, transporting and placing the upper mold and the lower mold.

[0094] Reference Figure 6 Before pressing the panel, the upper mold is first fixed to the mold fixing frame 3 through the upper mold connecting groove 13, and the lower mold is fixed to the pressing platform through the lower mold fixing groove 14. The mold fixing frame 3 is fixedly connected to the hydraulic rod 2 of the hydraulic press 1, and the hydraulic rod 2 of the hydraulic press 1 applies pressure to the upper mold to press the panel.

[0095] Example 2

[0096] This embodiment also provides a method for pressing a plate, which includes the following steps:

[0097] S1: Provide a flat workpiece and determine the processing bearing center point of the flat workpiece;

[0098] A flat plate workpiece is provided, which has a certain plastic deformation capacity. Two center lines with different directions of curvature change of the double cone are drawn on the flat plate workpiece, and the intersection of the two center lines is marked to determine the point as the bearing center point of the workpiece.

[0099] S2: placing the flat workpiece in a pressing mold, which uses the double-cone curvature pressing mold in Example 1, and placing the flat workpiece on the lower mold of the double-cone curvature pressing mold. The upper mold moves toward the lower mold until it contacts the flat workpiece, so that the contact point between the upper mold and the flat workpiece deviates from the processing center point. The deviation range between the contact point and the processing center point is a circular area with a radius of 100 mm and the processing center point as the center.

[0100] Specifically, the upper mold in the double-conical curvature pressing mold in Example 1 is used to press the flat plate workpiece, so that the contact point between the upper mold and the flat plate workpiece deviates from the processing center point. The deviation range is within a circular area with a radius of 100 mm and an offset distance with the processing center point as the center of the circle, so as to avoid side shear force.

[0101] S3: The upper mold continues to move toward the lower mold to perform preliminary pressing on the flat workpiece;

[0102] The upper mold continues to move toward the lower mold, controlling the pressing pressure and maintaining pre-pressing at a position of ±5mm near the two center lines.

[0103] S4: Edge correction of the workpiece after preliminary pressing;

[0104] During the pressurization process, first continuously apply 800T downward pressure, hold the pressure for 1 minute, then continue to apply force to 1600T, hold the pressure for 3 minutes, then release the pressure and observe the rebound of the plate and the edge linear accuracy; if wrinkles appear after applying force on the edge, pause and release the pressure in time, and do not apply downward pressure until the edge wrinkles are eliminated.

[0105] S5: placing the edge-corrected workpiece in the double-tapered curvature pressing mold for secondary pressing and forming;

[0106] After the initial molding, the machining allowance is cut off and the mold is placed again. The pressure is applied quickly and continuously to 1600T. After holding the pressure for 3 minutes, it is taken out and the molding is completed.

[0107] It should be noted that during the initial pressing of flat workpieces, a 50° longitudinal force angle is optimal. During the workpiece fabrication process, analysis of the mold force angle indicates that when the longitudinal force angle is between 0 and 45°, the mold and workpiece generate lateral thrust, which limits edge bending at the workpiece, severely impacting the metal structural properties and linear accuracy of the workpiece edge area. Increasing the longitudinal force angle to 50° ensures that the center point of the mold contact surface coincides with the center of the workpiece, ensuring full alignment and preventing edge bending. A 40° transverse force angle is optimal. When the mold and workpiece meet longitudinal alignment requirements, if the transverse thrust angle between the workpiece and the mold contact surface exceeds 45°, the workpiece is susceptible to relative displacement at the mold contact surface, resulting in surface thinning and severely impacting the structural strength of the workpiece. A transverse thrust angle of 35 to 40° effectively offsets the longitudinal force, a crucial aspect of mold fabrication.

[0108] In summary, the present invention's double-tapered curvature pressing die, by segmenting and splicing multiple curvature regions into a die contact panel, can be used in conjunction with a hydraulic press to achieve the integrated pressing of double-tapered curvature workpieces. This makes such workpieces easier to manipulate and manufacture, improves product qualification rates, ensures workpiece precision and appearance quality, and guarantees the physical and chemical performance indicators of the steel used for the workpieces. It also increases the efficiency of integrated processing of special curvature workpieces and effectively avoids sheet metal scrapping. This invention effectively resolves various difficulties encountered in the prior art in the processing of special steel double-tapered, multi-curvature, gradient workpieces and has high industrial value.

[0109] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A double-conical curvature pressing die, characterized in that: The upper mold comprises an upper mold and a lower mold, wherein the upper mold comprises: Upper mold base; An upper mold support base frame is fixedly arranged on the upper mold base; an upper mold contact panel, fixed to the upper mold support base frame and in contact with a surface of the upper mold support base frame away from the upper mold base, forming a convex surface protruding in a direction away from the upper mold support base frame; The lower mold comprises: Lower mold base; A lower mold support base frame is fixedly arranged on the lower mold base; a lower mold contact panel, fixed to the lower mold support base frame and in contact with a surface of the lower mold support base frame away from the lower mold base, forming a concave surface that is concave in a direction toward the upper mold support base frame; The convex surface of the upper mold contact panel matches the concave surface of the lower mold contact panel; The lower mold contact panel includes a first sector-shaped plane area, a first curvature area, a second curvature area, and a third curvature area. The first curvature area, the second curvature area, and the third curvature area are respectively closely connected with the sector-shaped plane area in sequence along the arc line of the sector edge of the sector-shaped plane area, and the first curvature area and the second curvature area are connected with each other, and the second curvature area and the third curvature area are connected with each other. The first curvature region is a gradual transition region with a curvature radius from 0 mm to 100 mm, the second curvature region is a gradual transition region with a curvature radius from 100 mm to 300 mm, and the third curvature region is a gradual transition region with a curvature radius from 300 mm to 500 mm; When using a double-conical curvature pressing mold for pressing, first provide a flat workpiece, determine the processing center point of the flat workpiece, place the flat workpiece on the lower mold of the double-conical curvature pressing mold, and move the upper mold toward the lower mold until it contacts the flat workpiece, so that the contact point between the upper mold and the flat workpiece deviates from the processing center point. The deviation range between the contact point and the processing center point is a circular area with a radius of 100 mm and the processing center point as the center of the circle; The upper mold continues to move toward the lower mold to perform preliminary pressing on the flat workpiece, and the longitudinal force angle of the mold is controlled to be 50 degrees and the transverse force angle of the mold is controlled to be 40 degrees.

2. The double-cone curvature pressing die according to claim 1, characterized in that: The upper mold contact panel includes a second fan-shaped plane area, a fourth curvature area, a fifth curvature area and a sixth curvature area. The fourth curvature area, the fifth curvature area and the sixth curvature area are respectively closely connected with the second fan-shaped plane area along the arc line of the fan-shaped edge of the second fan-shaped plane area, and the fourth curvature area and the fifth curvature area are connected with each other, and the fifth curvature area and the sixth curvature area are connected with each other.

3. The double-cone curvature pressing die according to claim 2, characterized in that: The fourth curvature area of the upper mold contact panel corresponds to the first curvature area of the lower mold contact panel; the fifth curvature area of the upper mold contact panel corresponds to the second curvature area of the lower mold contact panel; the sixth curvature area of the upper mold contact panel corresponds to the third curvature area of the lower mold contact panel.

4. The double-cone curvature pressing die according to claim 3, characterized in that: The fourth curvature area of the upper mold contact panel has the same curvature radius as the first curvature area of the lower mold contact panel, the fifth curvature area of the upper mold contact panel has the same curvature radius as the second curvature area of the lower mold contact panel, and the sixth curvature area of the upper mold contact panel has the same curvature radius as the third curvature area of the lower mold contact panel.

5. The double-tapered curvature pressing die according to claim 1, characterized in that: The lower mold support base frame includes: A lower mold longitudinal base frame is fixedly disposed on the lower mold base and extends along a first direction on the lower mold base; A plurality of lower mold transverse base frames are arranged on the lower mold longitudinal base frame at intervals along the first direction, and a single lower mold transverse base frame extends along the second direction, and the first direction is perpendicular to the second direction.

6. The double-cone curvature pressing die according to claim 5, characterized in that: A concave is provided on one side of each lower mold transverse base frame that contacts the lower mold contact panel. The concave is gradually concave along the direction from the edge to the center of the lower mold transverse base frame to form a concave strip frame.

7. The double-cone curvature pressing die according to claim 6, characterized in that: The concavity degree of each transverse base frame of the lower mold is different.

8. The double-cone curvature pressing die according to claim 1, characterized in that: The upper mold support base frame includes: An upper mold longitudinal base frame is fixedly disposed on the upper mold base and extends along a first direction on the upper mold base; A plurality of upper mold transverse base frames are arranged on the upper mold longitudinal base frame at intervals along the first direction, and a single upper mold transverse base frame extends along the second direction, and the first direction and the second direction are perpendicular to each other.

9. The double-cone curvature pressing die according to claim 8, characterized in that: A protrusion is provided on one side of each upper mold transverse base frame that contacts the upper mold contact panel. The protrusion gradually bulges upward from the edge to the center of the upper mold transverse base frame to form a convex strip frame.

10. The double-tapered curvature pressing die according to claim 5, characterized in that: Also includes: The base frame ring is arranged on both sides of the periphery of the plurality of lower mold transverse base frames along the first direction to connect the plurality of lower mold transverse base frames.

11. The double-tapered curvature pressing die according to claim 10, characterized in that: Also includes: A baffle extends along the second direction and connects the base frame circles on both sides.

12. The double-cone curvature pressing die according to claim 11, characterized in that: Also includes: A triangular reinforcement plate is provided along the first direction at the connection between the baffle and the lower mold base.

13. A plate pressing method, characterized in that: include: Provide a flat plate workpiece and determine the processing bearing center point of the flat plate workpiece; The flat workpiece is placed in a pressing mold, wherein the pressing mold is a double-conical curvature pressing mold according to any one of claims 1 to 12. The flat workpiece is placed on the lower mold of the double-conical curvature pressing mold, and the upper mold moves toward the lower mold until it contacts the flat workpiece, so that the contact point between the upper mold and the flat workpiece deviates from the processing center point, and the deviation range between the contact point and the processing center point is a circular area with a radius of 100 mm and the processing center point as the center; The upper mold continues to move toward the lower mold to perform preliminary pressing on the flat workpiece; Perform edge correction on workpieces after initial pressing; The edge-corrected workpiece is placed in the double-cone curvature pressing mold for secondary pressing and molding.

14. The plate pressing method according to claim 13, characterized in that: When the flat workpiece is initially pressed, the longitudinal force angle of the mold is controlled to be 50 degrees, and the transverse force angle of the mold is controlled to be 40 degrees.

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