Torque control methods for hot-formed stamping products, body and vehicle

Abstract

This invention belongs to the field of vehicle engineering technology, and particularly relates to a method for controlling the torsion of hot-formed stamped products. This method effectively controls the amount of springback torsion after hot-formed stamping by forming a spherical protrusion and puncture holes on the open side corresponding to the springback torsion area of ​​the product, ensuring the effectiveness of the forming process. By creating a cutting fixture with positioning surfaces and positioning pins consistent with the product's shape, the effectiveness of cutting the hot-formed product is ensured, stabilizing the dimensions of the hot-formed stamped product and guaranteeing the assembly requirements of the entire vehicle. The vehicle body provided by this invention is manufactured using the torsion control method for hot-formed stamping products, ensuring the dimensions of the vehicle body and meeting assembly requirements. The vehicle body provided by this invention is manufactured using the torsion control method for hot-formed stamping products, meeting the assembly requirements of the entire vehicle.

Description

Technical Field

[0001] This invention relates to the field of vehicle engineering technology, and in particular to a method for controlling the torque of a hot-formed stamped product, a vehicle body, and a vehicle. Background Technology

[0002] Thermoforming is a forming method in which the blank is first heated to a certain temperature, and then stamped in the corresponding mold by a stamping press and held under pressure for quenching to obtain the desired shape and at the same time realize the phase transformation of the metal material. After forming, the product is cut to obtain the required size. It has a wide range of applications in the field of vehicle technology.

[0003] In hot-formed stamping, the sheet metal contour is typically used as the forming positioning reference. Asymmetrical products often exhibit uneven forming around the perimeter during the forming process. To mitigate displacement of the working surface caused by this unevenness, pre-drilled positioning holes are designed on the sheet metal during the forming process design. However, when the asymmetry of the product shape severely impacts the forming process, leading to significant product distortion, the existing forming positioning reference combined with pre-drilled positioning holes cannot guarantee that the springback distortion after hot forming is within the allowable range. This compromises the effectiveness of the forming process, the positioning effectiveness during cutting, and the stability of the product's dimensions, ultimately affecting the overall vehicle assembly dimensions. Therefore, a method for controlling the distortion of hot-formed stamping products is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a method for controlling the torque of thermoformed stamping products, so as to ensure the dimensional stability of the product after thermoforming and meet assembly requirements.

[0005] Another objective of this invention is to provide a vehicle body manufactured using the aforementioned method for controlling the torque of hot-formed stamping products, thereby ensuring the dimensions of the vehicle body and meeting assembly requirements.

[0006] The third objective of this invention is to provide a vehicle that, by setting the above-mentioned body, meets the assembly requirements of the entire vehicle.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] Torque control methods for thermoformed stamping products include:

[0009] S1. Confirm the product's springback torsion.

[0010] S2. Based on the rebound torsion amount, a spherical convex bulge and a puncture hole are designed on the open side corresponding to the rebound torsion area of ​​the product, and the hole wall of the puncture hole is higher than the surface of the product.

[0011] S3, The product described in thermoforming;

[0012] S4. Make a cutting fixture according to the shape of the product after thermoforming;

[0013] S5. Use the cutting fixture to clamp and fix the thermoformed product;

[0014] S6. Cut off any excess burrs on the product after thermoforming.

[0015] Further, step S2 specifically involves designing the position and size of the spherical convex hull and the puncture hole based on the springback torsion amount.

[0016] Furthermore, step S4 specifically includes:

[0017] S41. Create the positioning surface of the cutting fixture based on the position of the inspection reference surface on the product;

[0018] S42. Make a spherical protrusion positioning pin on the cutting fixture according to the size of the spherical protrusion on the product;

[0019] S43. Make puncture hole positioning pins on the cutting fixture according to the size of the puncture hole on the product.

[0020] Furthermore, step S40 is included before step S41. Specifically, step S40 involves manufacturing the cutting fixture into a fixed part and an adjusting part that can be adjusted in position relative to the fixed part.

[0021] In step S41, the positioning surface is set on the adjustment part;

[0022] In step S42, the spherical convex hull positioning pin is set on the fixing part;

[0023] In step S43, the puncture hole positioning pin is set on the fixing part.

[0024] Further, in step S42, a plurality of first through holes are made on the fixing part according to the size of the spherical convex hull positioning pin, and one of the spherical convex hull positioning pins is inserted into the first through hole.

[0025] In step S43, multiple second through holes are made according to the size of the puncture hole positioning pin, and one of the puncture hole positioning pins is inserted into the second through hole.

[0026] Furthermore, the plurality of first through holes and the plurality of second through holes are fabricated in a one-to-one correspondence, and the arrangement direction and spacing of the plurality of first through holes and the plurality of second through holes are consistent.

[0027] Furthermore, step S5 specifically includes:

[0028] S51. The positioning surface supports the inspection reference surface on the product, the spherical convex locating pin abuts against the spherical convex hull, and the puncture hole locating pin is inserted into the puncture hole.

[0029] S52. Adjust the positions of the spherical convex locating pin and the puncture hole locating pin on the fixing part, and adjust the adjusting part of the cutting fixture to change the position of the locating surface and eliminate the interference between the locating surface and the working surface of the product.

[0030] Further, step S1 specifically involves performing a thermoforming stamping trial on the product and measuring the springback torsion of the product after thermoforming.

[0031] The car body is manufactured using the torsion control method for thermoformed stamping products described in any of the above schemes.

[0032] A vehicle, including an engine, chassis, electrical equipment, and a body as described above, wherein the engine, chassis, and electrical equipment are mounted on the vehicle body.

[0033] The beneficial effects of this invention are:

[0034] This invention provides a method for controlling the torsion of thermoformed stamping products. This method effectively controls the amount of springback torsion after the thermoformed stamping product is formed by forming a spherical protrusion and a puncture hole on the open side corresponding to the springback torsion area of ​​the product, thus ensuring the forming effectiveness of the product. By making a cutting fixture with positioning surfaces and positioning pins consistent with the product shape, the cutting effectiveness of the thermoformed product is ensured, the size of the thermoformed stamping product is stabilized, and the assembly requirements of the whole vehicle are guaranteed.

[0035] The present invention also provides a vehicle body, which is manufactured by a torsion control method for hot-formed stamping products, ensuring the dimensions of the vehicle body and meeting assembly requirements.

[0036] The present invention also provides a vehicle whose body is manufactured by a torsion control method of hot forming stamping products, thereby meeting the assembly requirements of the whole vehicle. Attached Figure Description

[0037] Figure 1 This is a flowchart of the torque control method for thermoformed stamping products provided in the embodiments of the present invention;

[0038] Figure 2 This is a schematic diagram of the detection reference surface of a thermoformed stamping product provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the positioning reference for the forming process of a thermoformed stamping product provided in an embodiment of the present invention;

[0040] Figure 4 yes Figure 3A magnified first-person perspective view of point A in the middle;

[0041] Figure 5 yes Figure 3 Enlarged diagram of the second perspective at point A in the middle;

[0042] Figure 6 This is a schematic diagram of the positioning pins on the thermoformed stamping product and the cutting fixture provided in the embodiment of the present invention;

[0043] Figure 7 yes Figure 6 Enlarged diagram of point B in the middle.

[0044] In the picture:

[0045] 1. Spherical convex hull; 2. Puncture hole; 3. Spherical convex hull positioning pin; 4. Puncture hole positioning pin. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0047] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0050] The following is combined with Figure 1-7 The technical solution of the present invention will be further explained through specific embodiments.

[0051] It should be noted that, in this embodiment, as Figure 2 The open side K shown is an engineering term referring to the surface that can be directly blanked and formed during stamping.

[0052] In thermoforming stamping, the sheet metal contour is generally used as a positioning reference. Asymmetrical products often exhibit uneven forming around the edges during the process. Therefore, pre-drilled positioning holes are designed on the sheet metal as forming positioning holes during the forming process design. However, when the asymmetry of the product shape severely affects the forming process and causes significant product distortion, the above forming positioning reference plus the pre-drilled positioning holes cannot guarantee that the springback distortion after thermoforming is within the allowable range of the process. This compromises the effectiveness of the forming process, the effectiveness of the product cutting process positioning, and the inability to stably control the product's dimensions, ultimately affecting the overall vehicle assembly dimensions.

[0053] To address the aforementioned problems, this invention provides a method for controlling the torsion of thermoformed stamped products. This method can control the amount of springback torsion during thermoforming of products with asymmetrical shapes, and includes the following steps:

[0054] S1. Confirm the product's springback torsion.

[0055] S2. Based on the amount of springback torsion, design a spherical protrusion 1 and a puncture hole 2 on the open side K corresponding to the springback torsion area of ​​the product. The wall of the puncture hole 2 is higher than the surface of the product.

[0056] S3, thermoformed products;

[0057] S4. Make cutting fixtures according to the shape of the thermoformed product;

[0058] S5. Use a cutting fixture to clamp and fix the thermoformed product;

[0059] S6. Cut off any excess burrs on the thermoformed product.

[0060] The torsion control method for this thermoformed stamping product effectively controls the amount of springback torsion after forming by forming a spherical protrusion 1 and a puncture hole 2 on the open side K corresponding to the springback torsion area of ​​the product, ensuring the forming effectiveness of the product. Furthermore, by manufacturing a cutting fixture that matches the shape of the product, the cutting effectiveness of the thermoformed product is ensured, and the dimensions of the thermoformed stamping product are stabilized.

[0061] Specifically, during thermoforming stamping, the product is formed with puncture holes 2 in the early stage of forming in the mold. The puncture holes 2 can fix the sheet metal in a certain position to ensure reasonable feeding, thereby avoiding excessive feeding in the early stage of forming and causing product distortion after forming. In the later stage of forming in the mold, the product is formed with spherical protrusions 1, which can control excessive feeding in the later stage of forming. The puncture holes 2 and spherical protrusions 1 work together to effectively control the springback distortion of the product after thermoforming within the range allowed by the process, ensuring the dimensional stability of the product after thermoforming.

[0062] In steps S1 and S2, for products with asymmetrical thermoforming shapes, in Figure 3 Under the conditions shown by thermoforming positioning references B1-B6, the product is directly subjected to thermoforming stamping trial production. The springback torsion of the product after thermoforming is measured and confirmed. If the springback torsion exceeds the allowable range of the process, a spherical protrusion 1 and a puncture hole 2 are designed on the open side K corresponding to the springback torsion area of ​​the subsequent product to be thermoformed. Based on the measured springback torsion, the position and size of the spherical protrusion 1 and the puncture hole 2 are designed, such as... Figure 4-5 As shown, the design dimensions of the spherical convex 1 and the puncture hole 2 include the height H1 of the spherical convex 1, the inner diameter D1 of the spherical convex 1, the wall height H2 of the puncture hole, and the inner diameter D2 of the puncture hole.

[0063] Or, during the product design phase, Figure 3 Based on the thermoforming positioning references B1-B6 shown, the theoretical springback torsion of the product is obtained through software analysis. According to the theoretical springback torsion, a spherical protrusion 1 and a puncture hole 2 are designed on the open side K corresponding to the springback torsion area of ​​the product. The product is then thermoformed and stamped, and the actual springback torsion of the product after thermoforming is measured. If the actual springback torsion is within the allowable range of the process, the product can be mass-produced. If there is a significant difference between the theoretical and actual springback torsion, the position and size of the spherical protrusion 1 and the puncture hole 2 are adjusted according to the actual springback torsion until the actual springback torsion of the product is controlled within the allowable range of the process.

[0064] In some other embodiments, the dimensions of the spherical protrusion 1 and the puncture hole 2 can be determined empirically before the product is thermoformed and stamped. The actual springback torsion of the product after thermoforming is measured. If the actual springback torsion is within the allowable range of the process, the product can be mass-produced. If the actual springback torsion exceeds the allowable range of the process, the position and dimensions of the spherical protrusion 1 and the puncture hole 2 are adjusted according to the actual springback torsion until the actual springback torsion of the product is controlled within the allowable range of the process. Optionally, the height H1 of the spherical protrusion is 4 times the thickness of the sheet metal used in the product, and the inner diameter D1 of the spherical protrusion is 8 times the thickness of the sheet metal. This can effectively control the rapid feeding and feeding balance of the open side K, while also protecting the puncture hole 2. The wall height H2 of the puncture hole is 2 times the thickness of the sheet metal used in the product, and the inner diameter D2 of the puncture hole is 8 times the thickness of the sheet metal. This can ensure the stability of the wall height H2 and the inner diameter D2 of the puncture hole, while also effectively controlling the feeding balance.

[0065] After thermoforming, the product's outline is cut to remove excess burrs and ensure the product dimensions are correct. For example... Figure 2 As shown, A1-A6 are the inspection reference surfaces of the product. To ensure the consistency of the reference surfaces during product thermoforming and cutting, a cutting fixture is made based on the shape of the thermoformed product when cutting it. Step S4 is as follows:

[0066] S41. Based on the positions of the product's inspection reference surfaces A1-A6, create the positioning surfaces of the cutting fixture;

[0067] S42. Make the spherical protrusion positioning pin 3 on the cutting fixture according to the size of the spherical protrusion 1 on the product.

[0068] S43. Make the puncture hole positioning pin 4 on the cutting fixture according to the size of the puncture hole 2 on the product.

[0069] During cutting, the positioning surface, spherical convex hull positioning pin 3, and puncture hole positioning pin 4 are used to position and clamp the product, ensuring the effectiveness of cutting thermoformed products.

[0070] Furthermore, after the thermoformed product is clamped and fixed on the cutting fixture, the positioning surface on the cutting fixture interferes with the working surface of the product. Before step S41, step S40 is also included. Specifically, step S40 is to make the cutting fixture include a fixing part and an adjusting part that can be adjusted in position relative to the fixing part.

[0071] In step S41, the positioning surface is set on the adjustment part of the cutting fixture;

[0072] In step S42, the spherical convex hull positioning pin 3 is set on the fixing part of the cutting fixture;

[0073] In step S43, the puncture hole positioning pin 4 is set on the fixing part of the cutting fixture.

[0074] Optionally, in step S42, multiple first through holes are made on the fixing part of the cutting fixture according to the size of the spherical convex hull positioning pin 3, and one of the spherical convex hull positioning pins 3 is inserted into the first through hole.

[0075] In step S43, multiple second through holes are made according to the size of the puncture hole positioning pin 4, and one of the puncture hole positioning pins 4 is inserted into the second through hole.

[0076] The position of the spherical convex locating pin 3 on the fixed part can be adjusted by multiple first through holes, and the position of the puncture hole locating pin 4 on the fixed part can be adjusted by multiple second through holes.

[0077] Furthermore, multiple first through holes and multiple second through holes are manufactured in a one-to-one correspondence, and the arrangement direction and spacing of the multiple first through holes and multiple second through holes on the fixing part of the cutting fixture are consistent.

[0078] In detail, step S5 is as follows:

[0079] S51. The positioning surface supports the inspection reference surfaces A1-A6 of the product. The spherical convex locating pin 3 abuts against the spherical convex 1, and the puncture hole locating pin 4 is inserted into the puncture hole 2. Figure 6-7 As shown;

[0080] S52. Adjust the position of the spherical convex hull positioning pin 3 and the puncture hole positioning pin 4 on the fixed part, and adjust the adjustment part of the cutting fixture to change the position of the positioning surface and eliminate the interference between the positioning surface and the working surface of the product.

[0081] Furthermore, the spherical convex locating pin 3 is adjusted to insert into the first through hole, and the piercing hole locating pin 4 is adjusted to insert into the second through hole. The adjusting part of the cutting fixture is adjusted so that the positioning surface of the cutting fixture is far away from the working surface of the product, thereby eliminating interference between the positioning surface of the cutting fixture and the working surface of the product. The adjusted cutting fixture is used to clamp and fix the thermoformed product, effectively ensuring the effectiveness of the positioning in the cutting process of the thermoformed stamping product. When adjusting the positions of the spherical convex locating pin 3 and the piercing hole locating pin 4 on the fixing part of the cutting fixture, the adjustment directions of the spherical convex locating pin 3 and the piercing hole locating pin 4 must be consistent to ensure that the working surface of the product is not skewed; moreover, the adjustment distances of the spherical convex locating pin 3 and the piercing hole locating pin 4 must also be consistent to ensure that the working surface of the product is not distorted.

[0082] It should be noted that whether the spherical protrusion 1 and the puncture hole 2 on the thermoformed product need to be removed can be selected adaptively according to the subsequent assembly requirements of the product.

[0083] Optionally, to further control the springback and torsion of the thermoformed product, during the thermoforming process, controlling the preheating temperature to maximize austenitization ensures the part's forming state; controlling the holding time improves heat transfer efficiency, ensuring the part's sturdy state; and controlling the cooling rate promotes quenching, ensuring the part's hardenability and minimal deformation. In this embodiment, the preheating temperature is 953℃, the holding time is 180 seconds, and the cooling rate is 1.5 m / s, which further controls the springback and torsion of the thermoformed product.

[0084] This invention provides a vehicle body manufactured by a torsion control method for hot-formed stamping products, which ensures the dimensions of the vehicle body and thus meets assembly requirements.

[0085] This invention also provides a vehicle, including an engine, chassis, electrical equipment, and body. The engine, chassis, and electrical equipment are mounted on the vehicle body, and the body is manufactured by a torsion control method using hot-formed stamping products, thus meeting the assembly requirements of the entire vehicle.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the torque of thermoformed stamped products, characterized in that, include: S1. Confirm the product's springback torsion. S2. Based on the rebound torsion amount, a spherical convex bulge (1) and a puncture hole (2) are designed on the open side corresponding to the rebound torsion area of ​​the product. The hole wall of the puncture hole (2) is higher than the surface of the product. S3, The product described in thermoforming; S4. Make a cutting fixture according to the shape of the product after thermoforming; S5. Use the cutting fixture to clamp and fix the thermoformed product; S6. Cut off any excess burrs on the product after thermoforming; Step S4 is as follows: S40. The cutting fixture is made to include a fixing part and an adjusting part that can be adjusted in position relative to the fixing part; S41. Create the positioning surface of the cutting fixture based on the position of the inspection reference surface on the product; S42. Make the spherical protrusion positioning pin (3) on the cutting fixture according to the size of the spherical protrusion (1) on the product. S43. Make a puncture hole positioning pin (4) on the cutting fixture according to the size of the puncture hole (2) on the product. In step S41, the positioning surface is set on the adjustment part; In step S42, the spherical convex hull positioning pin (3) is set on the fixing part; according to the size of the spherical convex hull positioning pin (3), a plurality of first through holes are made on the fixing part, and the spherical convex hull positioning pin (3) is selected and inserted into the first through hole; In step S43, the puncture hole positioning pin (4) is set on the fixing part; multiple second through holes are made according to the size of the puncture hole positioning pin (4), and the puncture hole positioning pin (4) is inserted into one of the second through holes. Step S5 is as follows: S51, the positioning surface supports the inspection reference surface on the product, the spherical convex hull positioning pin (3) abuts against the spherical convex hull (1), and the puncture hole positioning pin (4) is inserted into the puncture hole (2). S52. Adjust the position of the spherical convex locating pin (3) and the puncture hole locating pin (4) on the fixed part, and adjust the adjusting part of the cutting fixture to change the position of the locating surface and eliminate the interference between the locating surface and the working surface of the product.

2. The method for controlling the torque of a thermoformed stamped product according to claim 1, characterized in that, Step S2 specifically involves designing the position and size of the spherical convex hull (1) and the puncture hole (2) based on the springback torsion amount.

3. The method for controlling the torque of a thermoformed stamped product according to claim 1, characterized in that, Multiple first through holes and multiple second through holes are fabricated in a one-to-one correspondence, and the arrangement direction and spacing of the multiple first through holes and multiple second through holes are consistent.

4. The method for controlling the torque of a thermoformed stamped product according to claim 1, characterized in that, Step S1 specifically involves performing a thermoforming stamping trial on the product and measuring the springback torsion of the product after thermoforming.

5. The vehicle body, characterized in that, It is manufactured by the torque control method for thermoformed stamping products as described in any one of claims 1-4.

6. A vehicle, characterized in that, It includes an engine, chassis, electrical equipment, and the vehicle body as described in claim 5, wherein the engine, chassis, and electrical equipment are mounted on the vehicle body.

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