A longitudinal beam forming process and a stamping die

Abstract

This invention discloses a longitudinal beam forming process and stamping die. The process includes the following steps: placing the sheet metal on the lower die base; the blank core shaping cutter moves upward along with the lower blank core body to protrude from the lower die shaping cutter; the upper die base moves downward, driving the upper die floating shaping cutter to move downward under the action of spring force, forming the upper die convex cavity; the upper die base continues to move downward, and the lower blank core shaping cutter and the upper die floating shaping cutter work together; the upper die base continues to move downward, and the blank core shaping cutter moves downward along with the lower blank core body, and the lower die shaping cutter and the upper die floating shaping cutter gradually contact the sheet metal; the upper die base continues to move downward, starting to form the transverse shape of the part; the upper die convex cutter gradually contacts the sheet metal until the die is completely closed. This invention solves the problem of cracking and wrinkling of longitudinal beam parts after drawing; the problem that longitudinal beam parts cannot be formed to the beam depth in one step, and the wrinkling and cracking after multi-process flanging and shaping cannot effectively guarantee the quality of the overlapping surface.

Description

Technical Field

[0001] This invention relates to the field of automotive parts forming technology, and more specifically, to a longitudinal beam forming process and stamping die. Background Technology

[0002] With the iteration of automotive products, the upgrading of car consumption, and the continuous improvement of public demand for automotive safety performance, consumers have increasingly higher requirements for the structural strength of car bodies. As a crucial component ensuring the strength of the car body, the longitudinal beam is an extremely important part of guaranteeing the structural strength of the vehicle and plays a decisive role in ensuring the safety factor in a collision. Therefore, higher requirements are placed on the manufacturing processes of the various beam components that make up the floor beam. As the main skeleton, the longitudinal beam typically requires high material strength and usually has multiple parts overlapping it in both the transverse and longitudinal directions. This results in complex shapes for the longitudinal beam components. Existing longitudinal beam forming processes achieve the basic structural shape through drawing and then achieve multiple transverse and longitudinal overlapping edges through flanging and shaping. This process involves complex production steps, difficult forming, unstable production, and is prone to cracking and wrinkling during shaping, making it one of the challenging problems in the production of car body parts.

[0003] Therefore, how to provide a new forming process for vehicle body longitudinal beams to solve the problems of cracking and wrinkling during the production of longitudinal beam parts has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a longitudinal beam forming process and stamping die. It mainly solves the following problems: 1) Longitudinal beam parts are affected by material properties, resulting in cracking and wrinkling after drawing; 2) Longitudinal beam parts cannot be formed to the required beam depth in one step, and wrinkling and cracking after multiple flanging and shaping processes cannot effectively guarantee the quality of the overlapping surface.

[0005] According to one aspect of the present invention, a longitudinal beam forming process is provided, comprising the following steps:

[0006] Step S1: Place the sheet metal on the lower mold base and fix it with locating pins;

[0007] In step S2, the blank core shaping cutter moves upward together with the lower blank core body to protrude from the lower die shaping cutter.

[0008] Step S3: The upper mold base moves downward, causing the upper mold floating shaping cutter block to move downward under the action of spring force, forming the upper mold convex cavity;

[0009] In step S4, the upper mold base continues to descend, and the lower pressing core shaping blade and the upper mold floating shaping blade work together to fix the sheet metal on the movable side;

[0010] In step S5, the upper mold base continues to descend, the upper mold floating shaping blade remains in a protruding state, the blank core shaping blade follows the lower pressing core body downward, the lower mold shaping blade and the upper mold floating shaping blade gradually contact the sheet material until the lower pressing core body is completely reset.

[0011] In step S6, after the lower die pressing core resets and the longitudinal forming of the part is completed, the upper die base continues to descend and begins to form the transverse shape of the part; the upper die punch gradually contacts the sheet metal until the die is completely closed. As the transverse shape of the part is processed, the overall forming of the part is completed.

[0012] According to a second aspect of the present invention, a longitudinal beam stamping die is also provided for the longitudinal beam forming process described in the above embodiments, comprising an upper die holder and a lower die holder;

[0013] The upper mold base is provided with an upper mold protrusion block that is movably connected. The upper mold protrusion block is provided with upper mold floating shaping blocks on both sides. The upper mold protrusion block and the upper mold floating shaping blocks can form an upper mold protrusion cavity.

[0014] The lower mold base is provided with a lower pressing core body, and the lower pressing core body is provided with a forming cavity that cooperates with the upper mold protrusion block; movable lower pressing core shaping blades are provided on both sides of one end of the forming cavity, and fixed lower mold shaping blades are provided on both sides of the other end;

[0015] The lower pressing core shaping blade and the lower die shaping blade cooperate with the upper die floating shaping blade to form and fix the sheet metal.

[0016] Optionally, in the longitudinal beam stamping die according to the present invention, the height of the lower die forming cutter block is lower than the height of the lower pressing core forming cutter block.

[0017] Optionally, in the longitudinal beam stamping die according to the present invention, the lower pressing core shaping cutter is fixed on the lower pressing core, and the lower die shaping cutter is fixed on the lower die base.

[0018] Optionally, in the longitudinal beam stamping die according to the present invention, the periphery of the lower pressing core is provided with an anti-side guide plate, and the inner side of the lower die base that is in contact with the lower pressing core is provided with a sliding surface that cooperates with the anti-side guide plate.

[0019] Optionally, according to the longitudinal beam stamping die of the present invention, the upper die base is further provided with a die base anti-side guide plate, and the lower die base is provided with a lower die anti-side guide sliding surface that cooperates with the die base anti-side guide plate, so as to avoid lateral force between the upper die base and the lower die base.

[0020] This invention provides a longitudinal beam forming process and mold structure. By achieving forming work in both the transverse and longitudinal directions in the same process, it solves the problems of longitudinal beam parts not being able to be drawn out in one go, and wrinkling and cracking after multiple flanging and shaping processes, which cannot effectively guarantee the quality of the overlapping surface. At the same time, it saves parts production steps. Furthermore, by adjusting the magnitude of the floating forming blade force of the upper mold, longitudinal beam parts with greater depth can be formed. It also solves the problem of cracking and wrinkling in the drawing process of longitudinal beam parts due to the influence of material properties, effectively ensuring the quality of parts and achieving a new breakthrough in longitudinal beam forming technology.

[0021] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0023] Figure 1 This is a diagram illustrating the longitudinal beam forming process disclosed in this invention.

[0024] Figure 2 This is a structural diagram of the pressing core disclosed in this invention;

[0025] Figure 3 This is a structural diagram of the pressed core in the open state of the present invention;

[0026] Figure 4 This is a structural diagram of the upper mold floating shaping blade block in the open state of the present invention;

[0027] Figure 5 This is a sectional view of the movable side of the pressing core of the present invention;

[0028] Figure 6 This is a sectional view of the side where the pressing core is fixed according to the present invention;

[0029] Figure 7 This is a structural diagram of the resetting state of the pressed core according to the present invention;

[0030] Figure 8 This is a cross-sectional view of the mold in the closed state of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032]

[0033] Detailed Implementation

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] according to Figures 1 to 7 As shown, a longitudinal beam forming process includes the following steps:

[0040] The part forming process adopts a longitudinal-then-transverse forming scheme, such as... Figure 1 As shown, in the specific implementation process, the process design employs parting areas set in both the longitudinal and transverse directions. The upper mold forming blade and the upper mold protrusion 10 separate at the upper mold parting line 1, and the upper mold floating forming blade 11 floats downwards. The lower pressing core body 7 and the lower mold forming blade 9 separate longitudinally at the lower mold longitudinal parting line 2 and laterally at the lower mold transverse parting line 3, and the lower pressing core body 7 floats upwards. Multiple positioning pins 5 are designed around the perimeter of the blank line 4 outside the movable parts to fix the sheet metal.

[0041] Step S1: Place the sheet metal on the lower mold base 8 and fix it with the positioning pin 5.

[0042] In step S2, when the mold starts working, the lower pressing core shaping cutter block 6 on the movable side moves upward together with the lower pressing core body 7 to protrude the lower mold shaping cutter block 9, as shown. Figure 2 As shown. The lower die forming cutter block 9 on the fixed side is fixedly installed on the lower die base 8, forming a height difference along the longitudinal direction of the part according to the part's drop, such as... Figure 3 As shown, this provides a basis for longitudinal forming.

[0043] In step S3, the upper mold base 12 moves downward, causing the upper mold floating shaping cutter block 11 to move downward under the action of spring force, forming the upper mold convex cavity, as shown. Figure 4 As shown.

[0044] In step S4, the upper mold base 12 continues to descend, and the lower pressing core shaping cutter block 6 and the upper mold floating shaping cutter block 11 work together to fix the sheet metal on the movable side, such as... Figure 5 As shown, the lower die forming cutter block 9 maintains a certain distance from the upper die holder 12, as... Figure 6 As shown, this provides a basis for longitudinal forming.

[0045] In step S5, the upper die holder 12 continues to descend, the upper die floating shaping cutter block 11 remains in a protruding state, and the lower pressing core shaping cutter block 6 follows the lower pressing core body 7 downwards. The lower die shaping cutter block 9 and the upper die floating shaping cutter block 11 gradually contact the sheet metal until the lower pressing core body 7 is completely reset. Figure 7 As shown, this describes the process of completing the longitudinal forming of the part.

[0046] Step S6: After the lower die core resets and the longitudinal forming of the part is completed, the upper die holder 12 continues to descend, beginning to form the transverse shape of the part. At this time, the upper die floating shaping cutter block 11, together with the lower die shaping cutter block 9 and the lower core shaping cutter block 6, constrains the sheet metal, eliminating the forming wrinkling problem caused by the different cross-sections at different transverse positions of the part. Furthermore, the cracking caused by deep forming of the part can be resolved by adjusting the force of the upper die floating shaping cutter block 11. During the descent of the upper die, the upper die convex cutter block 10 gradually contacts the sheet metal until the die is completely closed. As the transverse shape of the part is processed, the overall forming of the part is completed. The closed section of the die is as follows: Figure 8 As shown.

[0047] This invention solves the problems of longitudinal beam parts not being able to be drawn out in one go, wrinkling and cracking after multiple flanging and shaping processes, and the inability to effectively guarantee the quality of the overlapping surface by realizing the forming work in both the transverse and longitudinal directions in the same process. At the same time, it saves parts production steps, and can achieve the forming of longitudinal beam parts with greater depth by adjusting the size of the floating forming blade of the upper die. It also solves the problem of cracking and wrinkling of longitudinal beam parts due to the influence of material properties during the drawing process, effectively ensuring the quality of parts and achieving a new breakthrough in longitudinal beam forming technology.

[0048] Then according to Figures 2 to 8 According to a second aspect of the present invention, a longitudinal beam stamping die is also provided for the longitudinal beam forming process described in the above embodiments, comprising an upper die holder 12 and a lower die holder 8.

[0049] The upper mold base 12 is provided with an upper mold protrusion block 10 that is movably connected. Upper mold floating shaping blocks 11 are provided on both sides of the upper mold protrusion block 10. The upper mold protrusion block 10 and the upper mold floating shaping blocks 11 can form an upper mold convex cavity.

[0050] The lower mold base 8 is provided with a lower pressing core body 7, and the lower pressing core body 7 is provided with a forming cavity that cooperates with the upper mold protrusion block 10; movable lower pressing core shaping blades 6 are provided on both sides of one end of the forming cavity, and fixed lower mold shaping blades 9 are provided on both sides of the other end.

[0051] The lower pressing core shaping cutter block 6 and the lower die shaping cutter block 9 cooperate with the upper die floating shaping cutter block 11 to form and fix the sheet material.

[0052] Furthermore, the height of the lower die forming blade 9 is lower than the height of the lower pressing core forming blade 6. The lower pressing core forming blade 6 is fixed on the lower pressing core, and the lower die forming blade 9 is fixed on the lower die base 8. This ensures that during the downward movement of the upper die base 12, the upper die floating forming blade 11 contacts the lower pressing core forming blade 6 first, guaranteeing the fixation of the sheet metal.

[0053] Furthermore, a side guide plate 15 is provided on the periphery of the pressing core, and a guide surface that cooperates with the side guide plate 15 is provided on the inner side of the lower die base 8 that fits against the pressing core. The side guide plate 15 guides the movement of the pressing core, improving accuracy.

[0054] Furthermore, the upper mold base 12 is also provided with a mold base anti-side guide plate 14, and the lower mold base 8 is provided with a lower mold anti-side guide sliding surface 13 that cooperates with the mold base anti-side guide plate 14, so as to avoid lateral forces between the upper mold base 12 and the lower mold base 8. Since the longitudinal beam has a large height difference in the Z direction, there is a large lateral force on the inclined part when the mold is closed to the bottom. Therefore, this structure is designed to avoid lateral forces between the upper and lower mold bases 8.

[0055] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A stringer forming process characterized by, The longitudinal beam stamping die includes an upper die base and a lower die base; The upper mold base is provided with an upper mold protrusion block that is movably connected. The upper mold protrusion block is provided with upper mold floating shaping blocks on both sides. The upper mold protrusion block and the upper mold floating shaping blocks can form an upper mold protrusion cavity. The lower mold base is provided with a lower pressing core body, and the lower pressing core body is provided with a forming cavity that cooperates with the upper mold protrusion block; movable lower pressing core shaping blocks are provided on both sides of one end of the forming cavity, and fixed lower mold shaping blocks are provided on both sides of the other end; The lower pressing core shaping blade and the lower die shaping blade cooperate with the upper die floating shaping blade to form and fix the sheet metal. The height of the lower die shaping blade is lower than the height of the lower pressing core shaping blade. The lower pressing core shaping cutter is fixed on the lower pressing core, and the lower die shaping cutter is fixed on the lower die base; The lower pressing core is provided with a side-protection guide plate on its periphery, and the inner side of the lower die base that is in contact with the lower pressing core is provided with a sliding surface that cooperates with the side-protection guide plate. The upper mold base is also provided with a mold base anti-side guide plate, and the lower mold base is provided with a lower mold anti-side guide sliding surface that cooperates with the mold base anti-side guide plate, so as to avoid lateral force between the upper mold base and the lower mold base; The longitudinal beam forming process includes the following steps: Step S1: Place the sheet metal on the lower mold base and fix it with locating pins; Step S2: The lower pressing core shaping cutter moves upward together with the lower pressing core body to protrude the lower die shaping cutter. Step S3: The upper mold base moves downward, causing the upper mold floating shaping cutter block to move downward under the action of spring force, forming the upper mold convex cavity; In step S4, the upper mold base continues to descend, and the lower pressing core shaping blade and the upper mold floating shaping blade work together to fix the sheet metal on the movable side; In step S5, the upper mold base continues to descend, the upper mold floating shaping blade remains in a protruding state, the lower pressing core shaping blade follows the lower pressing core body downward, the lower mold shaping blade and the upper mold floating shaping blade gradually contact the sheet material until the lower pressing core body is completely reset; In step S6, after the lower die pressing core resets and the longitudinal forming of the part is completed, the upper die base continues to descend and begins to form the transverse shape of the part; the upper die punch gradually contacts the sheet metal until the die is completely closed. As the transverse shape of the part is processed, the overall forming of the part is completed.

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