Punching equipment

Abstract

The utility model discloses stamping equipment which comprises a first stamping die and a second stamping die, the first stamping die is used for stamping a metal plate into a precast beam, and the second stamping die is used for stamping a metal plate into a precast beam. The second stamping die is used for stamping the precast beam into an n-shaped beam; wherein the stamping face, corresponding to stamping of the middle beam plate, of the first stamping die is a first stamping face, the first stamping face is a curved face which bends and extends in the width direction of the middle beam plate, in the bending and extending direction, the size of the first stamping face is L, the width of the middle beam plate is W, and L is larger than W. According to the stamping equipment, the metal plate can be stamped well, the metal plate can be subjected to plastic deformation well, and the stamping equipment has high production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal processing equipment technical field especially is involved in a stamping equipment. BACKGROUND

[0002] In the production process of the body-in-white stamping parts, the parts need to go through a process from elastic deformation to plastic deformation, because the tensile strength of high-strength material is too high, a greater forming force is needed to make the material plastically deform, and the elastic deformation of the same high-strength material is greater than that of the general plate material. Therefore, in the stamping forming process, the parts are often formed in place by multiple forming methods to ensure the final accuracy of the parts.

[0003] However, this forming process and method belong to hard die forming process, which causes a long debugging time and low production efficiency. SUMMARY

[0004] The utility model discloses at least one of the technical problems in the prior art. To this end, one purpose of the utility model is to provide a stamping equipment, which can better stamp the metal plate and make the metal plate better plastically deform, and has high production efficiency.

[0005] The stamping equipment according to the utility model embodiment is used for stamping a metal plate into a H-shaped beam, the H-shaped beam comprises a middle beam plate and first and second side plates connected on both sides of the middle beam plate, and the stamping equipment comprises: a first stamping die used for stamping the metal plate into a prefabricated beam; and a second stamping die used for stamping the prefabricated beam into a H-shaped beam, wherein the stamping surface of the first stamping die corresponding to the middle beam plate is a first stamping surface, the first stamping surface is a curved surface extending along the width direction of the middle beam plate, in the direction of the curved extension, the size of the first stamping surface is L, and the width of the middle beam plate is W, and L> W is satisfied.

[0006] In the process of stamping the metal plate by the first stamping die to form the prefabricated beam, the first stamping surface is designed as a curved surface extending along the width direction of the middle beam plate, so that the middle beam plate can be locally stretched, and when the second stamping die performs the final H-shaped beam forming stamping, the springback phenomenon can be effectively reduced, the size of the formed H-shaped beam is more accurate, and the stamping equipment of the utility model also improves the production efficiency and reduces the production cost.

[0007] In addition, the stamping equipment of the utility model can also have the following distinguishing technical features:

[0008] In some embodiments of the utility model, the size of the first stamping surface is L, the width of the middle beam plate is W, and 1.15≤L / W≤1.3 is satisfied.

[0009] In some embodiments of the utility model, the first stamping surface is an arc surface curved around a straight line along the length direction of the middle beam plate.

[0010] In some embodiments of the utility model, the stamping surface corresponding to the first stamping die for stamping the first side plate is a second stamping surface, the stamping surface corresponding to the first stamping die for stamping the second side plate is a third stamping surface, the second stamping surface and the third stamping surface are connected on both sides of the first stamping surface, the included angle between the second stamping surface and the first stamping surface is a1, the included angle between the third stamping surface and the first stamping surface is a2, the included angle between the first side plate and the middle beam plate is b1, the included angle between the second side plate and the middle beam plate is b2, and a1>b1, a2>b2 are satisfied.

[0011] In some embodiments of the utility model, the first stamping die satisfies a1-b1≥10° and a2-b2≥10°.

[0012] In some embodiments of the utility model, the first stamping die comprises a first upper die core and a first lower die core which are embedded with each other, and the first stamping surface comprises a curved surface which is recessed towards the first upper die core or recessed towards the first lower die core.

[0013] In some embodiments of the utility model, first stamping die still include: first upper die, first upper die include: first upper die holder, first upper die core is installed in first upper die holder, upper die pressure material board, upper die pressure material board is located in the width direction both sides of first upper die core, and can be up and down activity is installed in first upper die holder, pressure material board guide piece, pressure material board guide piece is installed in first upper die holder, for guiding the activity direction of upper die pressure material board, first limit component, first limit component includes first limit piece and second limit piece, first limit piece and second limit piece are all arranged between upper die pressure material board and first upper die holder, first limit piece includes first elastic pad, second limit piece includes first telescopic air cylinder, and both ends of first telescopic air cylinder are connected with upper die pressure material board and first upper die holder respectively, upper die backing plate, upper die backing plate is arranged at the bottom of first upper die core, pressure material board backing plate, pressure material board backing plate is arranged at the bottom of upper die pressure material board, first lower die, first lower die is arranged at the downside of first upper die, and first lower die includes: first lower die holder, first lower die core is installed in first lower die holder, and first lower die core includes lower die top material block and lower die forming block arranged at the width direction both sides of lower die top material block, lower die top material block is up and down activity is installed in first lower die holder, and first stamping surface is located on lower die top material block, lower die guide piece, lower die guide piece is installed in first lower die holder, for guiding the activity direction of lower die top material block, second limit component, second limit component includes third limit piece and fourth limit piece, third limit piece and fourth limit piece are all arranged between lower die top material block and first lower die holder, first limit piece includes second elastic pad, second limit piece includes second telescopic air cylinder, and both ends of second telescopic air cylinder are connected with lower die top material block and first lower die holder respectively.

[0014] In some embodiments of the utility model, the fourth stamping surface of the second stamping die corresponds to the stamping of the intermediate beam plate, the fifth stamping surface of the second stamping die corresponds to the stamping of the first side plate, the sixth stamping surface of the second stamping die corresponds to the stamping of the second side plate, the fifth stamping surface and the sixth stamping surface are connected on both sides of the fourth stamping surface, the included angle between the fifth stamping surface and the fourth stamping surface is a3, the included angle between the sixth stamping surface and the fourth stamping surface is a4, the included angle between the first side plate and the intermediate beam plate is b1, and the included angle between the second side plate and the intermediate beam plate is b2, and a3 < b1, a4 < b2 are met.

[0015] In some embodiments of the utility model, the second stamping die meets 1° ≤ b1-a3 ≤ 2°, 1° ≤ b1-a4 ≤ 2°.

[0016] In some embodiments of the utility model, the second stamping die includes: second upper die, the second upper die includes: second upper die holder and second upper die core, the second upper die core is fixed in the second upper die holder, second lower die, the second lower die includes second lower die holder and second lower die core, the second lower die core is fixed in the second lower die holder, wherein the second upper die core and the second lower die core are mutually embedded, the second upper die is provided with upper die stop block, the second lower die is provided with lower die stop block opposite the upper die stop block, the upper die stop block and the lower die stop block are used to limit the distance between the second upper die core and the second lower die core.

[0017] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0019] Figure 1 It is the structural schematic drawing of some embodiments of H beam.

[0020] Figure 2 It is the structural schematic drawing of first stamping die of some embodiments.

[0021] Figure 3 It is the structural schematic drawing of first upper die of some embodiments.

[0022] Figure 4 It is the explosion map of first telescopic cylinder, upper die backing plate, pressure plate backing plate, first upper die core, first elastic pad block of first upper die of some embodiments;

[0023] Figure 5 It is the structural schematic drawing of first lower die of some embodiments.

[0024] Figure 6 It is the explosion map of second telescopic cylinder, second elastic pad block, first lower die core and lower die ejector block of some embodiments;

[0025] Figure 7 It is the structural schematic drawing of second stamping die of some embodiments.

[0026] Figure 8 It is the structural schematic drawing of second upper die of some embodiments.

[0027] Figure 9 It is the structural schematic drawing of second lower die of some embodiments.

[0028] Reference signs:

[0029] 10, first punch die;

[0030] 1, first upper die; 11, first upper die holder; 12, upper die pressing plate; 13, pressing plate guide; 14, first telescopic cylinder; 151, upper die backing plate; 152, pressing plate backing plate; 16, first upper die core; 17, first elastic pad;

[0031] 2, first lower die; 21, first lower die holder; 22, lower die guide; 23, second telescopic cylinder; 24, second elastic pad; 25, first lower die core; 251, lower die ejector; 252, lower die forming block;

[0032] 20, second punch die;

[0033] 3, second upper die; 31, second upper die holder; 32, second upper die core; 33, upper die stop block;

[0034] 4, second lower die; 41, second lower die holder; 42, second lower die core; 43, lower die stop block;

[0035] 30, H-beam; 301, first side plate; 302, second side plate; 303, middle beam plate;

[0036] 401, first punching surface; 402, second punching surface; 403, third punching surface. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0038] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation. For ordinary skilled person in the art, the above-mentioned term can be understood according to the specific meaning in the utility model.

[0040] The application discloses a stamping equipment, which can stamp metal plates and make the metal plates better plastically deform, and has higher production efficiency.

[0041] In order to facilitate the description of the example, the metal plate is stamped into a H-beam 30, but it is not as a limitation of the application. The H-beam 30 includes a middle beam plate 303 and a first side plate 301 and a second side plate 302 connected on both sides of the middle beam plate 303.

[0042] The stamping equipment according to the embodiments of the utility model will be described below. Figures 1-9 The stamping equipment according to the embodiments of the utility model will be described below.

[0043] The stamping equipment according to the embodiments of the utility model includes a first stamping die 10 and a second stamping die 20, the first stamping die 10 is used for stamping a metal plate into a prefabricated beam, and the second stamping die 20 is used for stamping the prefabricated beam into a H-beam 30, wherein the stamping surface of the first stamping die 10 corresponding to the middle beam plate 303 is a first stamping surface 401, the first stamping surface 401 is a curved surface curvedly extending along the width direction of the middle beam plate 303, the size of the first stamping surface 401 in the curvedly extending direction is L, the width of the middle beam plate 303 is W, and L>W is met.

[0044] That is, the stamping equipment includes the first stamping die 10 and the second stamping die 20, and the two work cooperatively to provide a powerful guarantee for the efficient and accurate forming of the H-beam 30, and further, in the process that the first stamping die 10 stamps the metal plate to form the prefabricated beam, the first stamping surface 401 is designed as a curved surface curvedly extending along the width direction of the middle beam plate 303, and the size L in the curvedly extending direction is greater than the width W of the middle beam plate 303. The unique design makes the middle beam plate 303 be able to locally stretch when stamping, and the local stretching changes the stress distribution state inside the metal plate, thereby laying a good foundation for the subsequent plastic deformation.

[0045] When the preformed beam after being stamped by the first stamping die 10 enters the second stamping die 20 for final forming stamping, due to the local stretching effect caused by the first stamping die 10, the springback phenomenon of the metal plate is effectively reduced. In the stamping process, springback has always been an important problem affecting the forming precision, and the device significantly reduces the springback amount through the ingenious cooperation of the two stamping dies, so that the stamped H-beam 30 can better plastically deform according to the design requirements, and the size of the formed H-beam 30 is more accurate and the shape is more standardized, effectively improving the product quality.

[0046] In addition, the arrangement of the two-stage stamping die greatly improves the production efficiency. Compared with the traditional single-die complex stamping process or the stamping method of multiple adjustments and corrections, the stamping device can quickly pass the metal plate through the first stamping die 10 and the second stamping die 20 in turn, continuously and efficiently complete the stamping and forming of the H-beam 30, reduce the processing time and labor cost, improve the production efficiency, and reduce the production cost.

[0047] Therefore, according to the stamping device of the embodiment of the utility model, in the process that the first stamping die 10 stamps the metal plate to form the preformed beam, the first stamping surface 401 is designed as a curved surface extending along the width direction of the middle beam plate 303, which can make the middle beam plate 303 locally stretch, and when the second stamping die 20 performs final H-beam 30 forming stamping, the springback phenomenon can be effectively reduced, the size of the formed H-beam 30 is more accurate, and the stamping device of the present application also improves the production efficiency and reduces the production cost.

[0048] In some embodiments of the utility model, the size of the first stamping surface 401 is L and the width of the middle beam plate 303 is W, which satisfies: 1.15≤L / W≤1.3. That is, under the condition of 1.15≤L / W≤1.3, it can ensure that the local stretching of the middle beam plate 303 is just right when the first stamping die 10 stamps. Neither can it effectively improve the performance of the metal plate due to insufficient stretching, nor can it cause material damage due to excessive stretching. Proper stretching optimizes the internal organizational structure of the metal plate, reasonably increases the dislocation density, and the subsequent stamping by the second stamping die 20 can accurately shape the H-beam 30, significantly reduce the springback amount, and the product size precision is high, the production process is smooth and efficient, and the stability and reliability of the overall stamping process are significantly improved.

[0049] Exemplarily, L / W can be: 1.15, 1.16, 1.17, 1.18, 1.19, 1.2, 1.22, 1.25, 1.28, 1.3.

[0050] In some embodiments of the utility model, first stamping surface 401 is the curved surface that is curved around the straight line of length direction of intermediate beam plate 303. The curved surface structure makes the stamping pressure more evenly distributed on intermediate beam plate 303, avoids the damage of plate material caused by stress concentration. In the process of being stamped into prefabricated beam, the uniform stress can guide the material to extend along the curved surface smoothly, effectively improves the plastic deformation ability of metal plate. When entering second stamping die 20 and stamping, the good extension effect in early stage can significantly reduce the springback phenomenon, makes the forming precision of several character beams 30 higher, and can reduce die wear, prolongs the service life of die, improves the stability and economy of overall stamping production.

[0051] In some embodiments of the utility model, refer to Figure 4 , the stamping surface of first stamping die 10 corresponding to stamping first side plate 301 is second stamping surface 402, the stamping surface of first stamping die 10 corresponding to stamping second side plate 302 is third stamping surface 403, second stamping surface 402 and third stamping surface 403 are connected on both sides of first stamping surface 401, the included angle between second stamping surface 402 and first stamping surface 401 is a1;The included angle between third stamping surface 403 and first stamping surface 401 is a2;The included angle between first side plate 301 and intermediate beam plate 303 is b1;The included angle between second side plate 302 and intermediate beam plate 303 is b2;Satisfy: a1>b1, a2>b2.

[0052] That is to say, in the stamping process, due to a1>b1 and a2>b2, first stamping die 10 can exert relatively greater bending force on first side plate 301 and second side plate 302 when stamping metal plate to form prefabricated beam. This helps the side plate to be more accurately bent and formed according to the preset angle, effectively avoids the size deviation caused by insufficient bending. At the same time, the larger included angle design can make the connecting parts of side plate and intermediate beam plate 303 produce moderate extrusion and stretching when stamping, enhance the connection tightness and structural integrity between them. When second stamping die 20 further stamps prefabricated beam into several character beams 30, it can better maintain the stability of structure shape, reduce the springback deformation caused by unstable structure, thereby greatly improving the forming quality and size precision of several character beams 30, improving product qualification rate, reducing production cost and improving production efficiency.

[0053] In the above example, from the perspective of mechanics, larger a1 and a2 angles mean that when the first stamping die 10 acts, the first stamping die 10 exerts a greater force on the first side plate 301 and the second side plate 302 in the direction perpendicular to the side plate. This is based on the principle of force decomposition. When the stamping die has a large angle with the side plate, according to the trigonometric function relationship, the perpendicular side plate direction force will increase, thereby being able to more effectively overcome the initial rigidity of the metal plate, and prompting the side plate to bend and deform according to the design requirements. From the principle of material deformation, the metal plate undergoes elastic deformation and plastic deformation stages during stamping. At the initial stamping, the larger force brought by the larger a1 and a2 angles can quickly make the stress of the side plate material exceed the yield limit and enter the plastic deformation stage, realizing the preliminary shaping of the angle between the side plate and the middle beam plate 303.

[0054] The first stamping surface 401 is an arc surface curved around the straight line in the length direction of the middle beam plate 303, which provides a uniform and continuous pressure distribution environment for the middle beam plate 303 during stamping. Its curved shape matches the expected deformation shape of the middle beam plate 303, so that the middle beam plate 303 can smoothly extend and deform along the curvature direction of the arc surface during stamping, avoiding material rupture or uneven deformation caused by local stress concentration.

[0055] The second stamping surface 402 and the third stamping surface 403 are connected on both sides of the first stamping surface 401, and they together with the first stamping surface 401 form an integral stamping profile. During stamping, this connection relationship ensures that the deformation transition from the middle beam plate 303 to the side plate is continuous and coordinated. When pressure is applied to the die, the force can be smoothly transmitted from the first stamping surface 401 to the second stamping surface 402 and the third stamping surface 403, and then simultaneously act on the middle beam plate 303 and the side plates on both sides, so that each part of the entire L-beam 30 structure deforms synchronously in the same stamping stroke, improving the stamping efficiency and ensuring the relative position accuracy between the parts.

[0056] In some embodiments of the utility model, first stamping die 10 satisfies: a1-b1≥10°, and / or, a2-b2≥10°. That is, the larger angle difference can provide sufficient additional bending allowance for first side plate 301 and second side plate 302 during stamping. In the initial stage of stamping, this design can make the side plate material experience more plastic deformation, effectively eliminate the residual stress inside the material, make the connection transition of the side plate and the middle beam plate 303 more natural and smooth, greatly improve the strength and stability of the connection part. From the perspective of die stamping process, this condition can reduce the strict requirements on die stamping precision, because the larger angle adjustment space can accommodate certain stamping errors, reducing the scrap rate caused by slight deviation of the die. At the same time, it is helpful to improve the stamping speed, because the die does not need to control the angle change too finely during stamping, thereby significantly improving the overall stamping production efficiency, reducing production cost and ensuring the reliability and consistency of product quality.

[0057] In some embodiments of the utility model, first stamping die 10 includes: first upper die core 16 and first lower die core 25 embedded with each other, first stamping surface 401 includes a curved surface recessed towards first upper die core 16, and / or, first stamping surface 401 includes a curved surface recessed towards first lower die core 25.

[0058] That is, from the stress distribution during stamping, whether first stamping surface 401 is recessed towards first upper die core 16 or first lower die core 25, the metal plate can be subjected to more uniform and controllable pressure during stamping. The recessed curved surface structure can guide the stress to gradually transmit and disperse along the curvature direction of the curved surface, avoiding the generation of stress concentration phenomenon, effectively reducing the risk of rupture or local excessive deformation of the metal plate during stamping, thereby improving the forming quality and pass rate of the product.

[0059] In terms of durability of the die, this embedded die core structure cooperates with the special stamping surface design to reduce the damage of the impact force borne by the die during stamping to its own structure. Uniformly distributed stress makes the wear of each part of the die more balanced, prolongs the service life of first upper die core 16 and first lower die core 25, reduces the cost and time loss of frequent replacement of the die, and is beneficial to the continuity and stability of stamping production.

[0060] For the precision control of the stamping forming, due to the existence of the concave curved surface, the deformation path of the metal plate can be guided more accurately during stamping. Especially in the middle beam plate 303 part of the preformed beam, the width direction bending deformation can be accurately carried out according to the preset curved surface shape, so that the size precision of the middle beam plate 303 and the whole preformed beam is significantly improved. When the second stamping die 20 is used to stamp the character-shaped beam 30, the final size of the product can be better guaranteed to meet the standard requirements, the product rework or scrap caused by precision problems is reduced, and the overall production efficiency and economic benefits are improved.

[0061] In some embodiments of the utility model, as shown in Figures 1-6 The first stamping die 10 further comprises a first upper die 1 and a first lower die 2, the first upper die 1 comprises a first upper die holder 11, an upper die blanking plate 12, a blanking plate guide 13, a first limiting assembly, an upper die pad 151 and a blanking plate pad 152, and the first upper die core 16 is installed on the first upper die holder 11; the upper die blanking plate 12 is located on both sides of the width direction of the first upper die core 16 and is movably installed on the first upper die holder 11; the blanking plate guide 13 is installed on the first upper die holder 11 and is used to guide the moving direction of the upper die blanking plate 12; the first limiting assembly comprises a first limiting piece and a second limiting piece, and the first limiting piece and the second limiting piece are both arranged between the upper die blanking plate 12 and the first upper die holder 11; the first limiting piece comprises a first elastic pad 17, the second limiting piece comprises a first telescopic cylinder 14, and the two ends of the first telescopic cylinder 14 are connected with the upper die blanking plate 12 and the first upper die holder 11 respectively; the upper die pad 151 is arranged at the bottom of the first upper die core 16; and the blanking plate pad 152 is arranged at the bottom of the upper die blanking plate 12.

[0062] The first lower die 2 is arranged on the lower side of the first upper die 1, and the first lower die 2 comprises a first lower die holder 21, a lower die guide 22 and a second limiting assembly; the first lower die core 25 is installed on the first lower die holder 21, and the first lower die core 25 comprises a lower die ejector block 251 and a lower die forming block 252 arranged on both sides of the width direction of the lower die ejector block 251; the lower die ejector block 251 is movably installed on the first lower die holder 21, and the first stamping surface 401 is located on the lower die ejector block 251; the lower die guide 22 is installed on the first lower die holder 21 and is used to guide the moving direction of the lower die ejector block 251; the second limiting assembly comprises a third limiting piece and a fourth limiting piece, and the third limiting piece and the fourth limiting piece are both arranged between the lower die ejector block 251 and the first lower die holder 21; the first limiting piece comprises a second elastic pad 24, the second limiting piece comprises a second telescopic cylinder 23, and the two ends of the second telescopic cylinder 23 are connected with the lower die ejector block 251 and the first lower die holder 21 respectively.

[0063] The working process of the first stamping die 10 is as follows:

[0064] Initial state preparation: the first telescopic cylinder 14 is in a natural state or a pre-compressed state, giving the upper die pressing plate 12 a certain initial force, and the second telescopic cylinder 23 is also in a corresponding state, so that the lower die ejector block 251 is in an initial position, and the first upper die 1 is in a raised position and separated from the first lower die 2. At this time, the metal plate to be stamped is placed on the corresponding position of the first lower die 2, usually on the area surrounded by the lower die forming block 252.

[0065] Mold closing and stamping stage: the first upper die 1 starts to move downward under the drive of an external stamping power source (such as a stamping machine slide). As the first upper die 1 moves downward, the upper die pressing plate 12 first contacts the metal plate. In the process of continuing to move downward, the upper die pressing plate 12 starts to move relatively in the direction of the upper die frame under the resistance of the metal plate, overcoming the elastic force of the first telescopic cylinder 14. The pressing plate guide 13 ensures that the upper die pressing plate 12 moves stably in the set direction, and the pressing plate pad 152 tightly abuts against the surface of the metal plate, pressing the metal plate tightly on the first lower die 2, preventing the metal plate from shifting or lifting during stamping, and ensuring the accuracy of the stamping position. The first elastic pad 17 can limit the distance between the upper die pressing plate 12 and the first upper die frame 11.

[0066] When the first upper die core 16 gradually approaches the metal plate, the lower die ejector block 251 on the first lower die frame 21 starts to move downward under the pressure of the first upper die core 16, overcoming the elastic force of the second telescopic cylinder 23. The second elastic pad 24 limits the downward stroke of the lower die ejector block 251, ensuring that it moves within a safe range, and the lower die guide 22 ensures that the moving direction of the lower die ejector block 251 is stable. At this time, the first stamping surface 401 located on the lower die ejector block 251 starts to contact the metal plate and stamp the middle beam plate 303 part of the metal plate, causing it to bend and deform according to the shape of the first stamping surface 401. At the same time, the lower die forming block 252 cooperates with the two sides of the first upper die core 16 to stamp the side plate parts on both sides of the metal plate, causing the side plates to gradually form. In this process, the metal plate is gradually stamped into the shape of a precast beam under the action of the first stamping die 10, and the pressure during stamping is evenly distributed on the die and the metal plate through components such as the upper die pad 151 and the lower die ejector block 251.

[0067] Demolding stage: after the stamping is completed, the first upper die 1 starts to move upward under the drive of the stamping power source. As the first upper die 1 moves upward, the upper die pressing plate 12 gradually resets downward under the elastic force of the first telescopic cylinder 14, releasing the pressing force on the precast beam that has been stamped. At the same time, the lower die ejector block 251 moves upward under the elastic force of the second telescopic cylinder 23, ejecting the precast beam from between the lower die forming blocks 252, facilitating the removal of the precast beam from the die. Thus, a complete stamping work process is completed, and the die is ready for the next stamping cycle.

[0068] In some embodiments of the utility model, the second stamping die 20 corresponds to the fourth stamping surface of the stamping middle beam plate 303, the second stamping die 20 corresponds to the fifth stamping surface of the first side plate 301, the second stamping die 20 corresponds to the sixth stamping surface of the second side plate 302, the fifth stamping surface and the sixth stamping surface are connected on both sides of the fourth stamping surface, the included angle between the fifth stamping surface and the fourth stamping surface is a3, the included angle between the sixth stamping surface and the fourth stamping surface is a4, the included angle between the first side plate 301 and the middle beam plate 303 is b1, the included angle between the second side plate 302 and the middle beam plate 303 is b2, and a3 < b1, a4 < b2 are met.

[0069] That is, the smaller a3 and a4 angles, that is, the smaller the core angle, provide a strong guarantee for the precise forming of the H-shaped beam 30. In the stamping process, the bending force applied to the side plate is just right due to the proper angle design, which can effectively avoid excessive deformation or damage of the material caused by excessive stamping, and ensure the integrity and stability of the H-shaped beam 30 structure. What is particularly key is that this small angle design fully considers the springback characteristics of the metal material. After stamping is completed, the H-shaped beam 30 will inevitably produce springback phenomenon, but due to the special angle setting of the second stamping die 20, the H-shaped beam 30 can accurately keep in the predetermined formed shape after a certain springback. This greatly improves the forming precision of the product, effectively reduces the size deviation caused by springback, reduces the need for subsequent correction or trimming process, thereby significantly improving the production efficiency and reducing the production cost. At the same time, the reasonable angle design also makes the mold bear more uniform stress during stamping, reduces the wear and tear of the mold, and prolongs the service life of the mold.

[0070] In some embodiments of the utility model, the second stamping die 20 meets 1°≤b1-a3≤2° and / or 1°≤b1-a4≤2°.

[0071] Satisfying the above conditions, the small angle difference range makes it possible to compensate for the slight angle deviation that may exist after the first stamping while not damaging the structure that has been preliminarily formed due to the excessive adjustment range during the second stamping. This can ensure that the included angle between the side plate and the middle beam plate 303 of the final H-shaped beam 30 product meets the design requirements, effectively reduces the product unqualified rate caused by angle error, improves the overall size accuracy and shape consistency of the product, and enables the H-shaped beam 30 to better match and connect with other components in the subsequent installation and use process.

[0072] In some embodiments of the utility model, second punch die 20 includes: second upper die 3 and second lower die 4, second upper die 3 includes: second upper die holder 31 and second upper die core 32, second upper die core 32 is fixed in second upper die holder 31, second lower die 4 includes second lower die holder 41 and second lower die core 42, and second lower die core 42 is fixed in second lower die holder 41, wherein, second upper die core 32 and second lower die core 42 are mutually embedded, second upper die 3 is provided with upper die stop block 33, second lower die 4 is provided with lower die stop block 43 opposite to upper die stop block 33, and upper die stop block 33 and lower die stop block 43 are used to limit the distance between second upper die core 32 and second lower die core 42.

[0073] The working process of second punch die 20 stamping prefabricated beam is as follows:

[0074] Preparation stage: first, the prefabricated beam obtained by first punch die 10 stamping is placed on the appropriate position of second lower die 4, at this time, second upper die 3 is in the state of being lifted, that is, there is a certain distance between second upper die core 32 and prefabricated beam, and upper die stop block 33 and lower die stop block 43 are not in contact.

[0075] Die closing and stamping stage: under the driving of external stamping power source (such as punch machine slider), second upper die 3 starts to move downward. With the downward movement of second upper die 3, second upper die core 32 gradually approaches prefabricated beam. When second upper die core 32 contacts prefabricated beam, it starts to apply pressure to it, and the pressure acts on each corresponding part of prefabricated beam through second upper die core 32 and second lower die core 42, that is, fourth stamping surface acts on middle beam plate 303, fifth stamping surface acts on first side plate 301, and sixth stamping surface acts on second side plate 302, so that prefabricated beam further plastically deforms according to the shape of second punch die 20, and gradually forms the shape of final L-shaped beam 30. In this process, with the mutual approach of second upper die core 32 and second lower die core 42, upper die stop block 33 also gradually approaches lower die stop block 43.

[0076] Limiting and stopping stage: when the distance between second upper die core 32 and second lower die core 42 reaches the preset value, upper die stop block 33 contacts lower die stop block 43, at this time, upper die stop block 33 and lower die stop block 43 limit the further approach of second upper die core 32 and second lower die core 42, so as to control the depth and pressure of stamping, and ensure that the L-shaped beam 30 forming process will not cause mold damage or excessive product deformation due to excessive stamping. This stage enables the stamping process to be carried out within a safe and controllable range, ensuring the quality of the product and the service life of the mold.

[0077] Demoulding stage: after the stamping is completed, the second upper die 3 starts to move upward under the driving of the stamping power source. At this time, the several-beam 30 which has been stamped and formed is left on the second lower die 4, and can be taken out by a suitable material taking device, thus completing a complete stamping work process of the second stamping die 20, and the die is then ready for the next stamping cycle.

[0078] Other configurations and operations according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail herein.

[0079] In the description of the present application, the description of the terms "some embodiments", "optionally", "further", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stamping apparatus for stamping a metal sheet into a h-shape beam (30) comprising a middle beam plate (303) and a first side plate (301), a second side plate (302) connected on both sides of the middle beam plate (303), characterized in that, The stamping device comprises: a first stamping die (10) for stamping the metal plate into a prefabricated beam; a second stamping die (20) for stamping the prefabricated beam into a U-shaped beam (30); wherein, the first stamping face (401) corresponding to the stamping of the intermediate beam plate (303) is a curved surface extending along the width direction of the intermediate beam plate (303), and in the direction of the curved extension, the size of the first stamping face (401) is L, and the width of the intermediate beam plate (303) is W, satisfying: L>W.

2. The stamping apparatus of claim 1, wherein, The size of the first stamping face (401) is L, and the width of the intermediate beam plate (303) is W, satisfying: 1.15≤L / W≤1.

3.

3. The stamping apparatus of claim 1, wherein, The first stamping face (401) is an arc surface curved around a straight line in the length direction of the intermediate beam plate (303).

4. The stamping apparatus of claim 1, wherein, The second stamping face (402) corresponding to the stamping of the first side plate (301) and the third stamping face (403) corresponding to the stamping of the second side plate (302) are connected on both sides of the first stamping face (401), The angle between the second stamping face (402) and the first stamping face (401) is a1; The angle between the third stamping face (403) and the first stamping face (401) is a2; The angle between the first side plate (301) and the intermediate beam plate (303) is b1; The angle between the second side plate (302) and the intermediate beam plate (303) is b2; Satisfying: a1>b1, a2>b2.

5. The stamping apparatus of claim 4, wherein, The first stamping die (10) satisfies: a1-b1≥10°, a2-b2≥10°.

6. The stamping apparatus of any one of claims 1-5, wherein, The first stamping die (10) comprises a first upper die core (16) and a first lower die core (25) embedded with each other, and the first stamping face (401) comprises a curved surface recessed towards the first upper die core (16) or recessed towards the first lower die core (25).

7. The stamping apparatus of claim 6, wherein, The first stamping die (10) further comprises: a first upper die (1) comprising: a first upper die frame (11) in which the first upper die core (16) is installed; an upper die blanking plate (12) located on both sides of the width direction of the first upper die core (16) and movably installed in the first upper die frame (11); a blanking plate guide (13) installed in the first upper die frame (11) for guiding the moving direction of the upper die blanking plate (12); A first limiting assembly, the first limiting assembly comprises a first limiting member and a second limiting member, the first limiting member and the second limiting member are both arranged between the upper die pressing plate (12) and the first upper die frame (11), the first limiting member comprises a first elastic pad (17), and the second limiting member comprises a first telescopic cylinder (14), two ends of the first telescopic cylinder (14) are connected with the upper die pressing plate (12) and the first upper die frame (11) respectively; An upper die backing plate (151) is arranged at the bottom of the first upper die core (16); A pressing plate backing plate (152) is arranged at the bottom of the upper die pressing plate (12); A first lower die (2) is arranged at the lower side of the first upper die (1), and the first lower die (2) comprises: A first lower die frame (21), the first lower die core (25) is installed on the first lower die frame (21), the first lower die core (25) comprises a lower die ejector pad (251) and a lower die forming block (252) arranged on both sides of the lower die ejector pad (251) in the width direction, the lower die ejector pad (251) is movably installed on the first lower die frame (21), and the first stamping surface (401) is located on the lower die ejector pad (251); A lower die guide (22) is installed on the first lower die frame (21) and used for guiding the moving direction of the lower die ejector pad (251); A second limiting assembly, the second limiting assembly comprises a third limiting member and a fourth limiting member, the third limiting member and the fourth limiting member are both arranged between the lower die ejector pad (251) and the first lower die frame (21), the first limiting member comprises a second elastic pad (24), and the second limiting member comprises a second telescopic cylinder (23), two ends of the second telescopic cylinder (23) are connected with the lower die ejector pad (251) and the first lower die frame (21) respectively.

8. The stamping apparatus of any one of claims 1-5, wherein, The second stamping die (20) corresponds to a fourth stamping surface for stamping the intermediate beam plate (303), the second stamping die (20) corresponds to a fifth stamping surface for stamping the first side plate (301), the second stamping die (20) corresponds to a sixth stamping surface for stamping the second side plate (302), the fifth stamping surface and the sixth stamping surface are connected on both sides of the fourth stamping surface, The included angle between the fifth stamping surface and the fourth stamping surface is a3; The included angle between the sixth stamping surface and the fourth stamping surface is a4; The included angle between the first side plate (301) and the intermediate beam plate (303) is b1; The included angle between the second side plate (302) and the intermediate beam plate (303) is b2; It is satisfied that a3 < b1, a4 < b2.

9. The stamping apparatus of claim 8, wherein, The second stamping die (20) satisfies: 1° ≤ b1-a3 ≤ 2°, 1° ≤ b1-a4 ≤ 2°.

10. The stamping apparatus of claim 8, wherein, The second stamping die (20) comprises: A second upper mold (3) comprises a second upper mold base (31) and a second upper mold core (32) fixed in the second upper mold base (31); A second lower mold (4) comprises a second lower mold base (41) and a second lower mold core (42) fixed in the second lower mold base (41), wherein the second upper mold core (32) and the second lower mold core (42) are mutually embedded, the second upper mold (3) is provided with an upper mold stop block (33), the second lower mold (4) is provided with a lower mold stop block (43) opposite to the upper mold stop block (33), and the upper mold stop block (33) and the lower mold stop block (43) are used for limiting the distance between the second upper mold core (32) and the second lower mold core (42).

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