Instrument panel cross beam machining method and instrument panel cross beam

Abstract

The invention relates to the field of automobile parts, and discloses an instrument panel cross beam machining method and an instrument panel cross beam. The instrument panel cross beam machining method adopts an injection molding mode to machine an instrument panel cross beam, and in the injection molding process of the instrument panel cross beam, injection molding is carried out by adopting injection molding parameters of a first injection speed and a first screw rotating speed in a first time period; in the second time period, injection molding parameters of the second injection speed and the second screw rotating speed are adopted for injection molding; wherein the first injection speed is greater than the second injection speed, and the first screw rotation speed is greater than or equal to the second screw rotation speed. Therefore, the distribution of the glass fibers can be optimized only by adjusting the injection molding parameters of the first time period and the second time period, so that the mechanical property of the instrument panel cross beam is improved, and compared with the mode that the content of defects and impurities needs to be accurately controlled in the related technology, the production cost and the production difficulty can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle accessories, and in particular to a method for processing a dashboard crossbeam and a dashboard crossbeam. Background Art

[0002] As a car structural part, the dashboard cross beam not only needs to bear the use load, but also needs to ensure the rigidity and strength of the overall structure. At present, the mainstream cross beams are mainly steel cross beams, but with the development of technology and the increase in lightweight requirements, steel-plastic hybrid dashboard cross beams are receiving more and more attention.

[0003] In the related art, the mechanical properties of the cross beam are improved by controlling the defect content and impurity content of the material. However, reducing defects and impurities requires complex preparation processes and high-quality raw materials, resulting in high production costs for instrument panel cross beams. In addition, precise control of the content of defects and impurities requires high-level technical means and equipment, resulting in greater difficulty in producing instrument panel cross beams. Summary of the invention

[0004] In view of this, the present invention provides a dashboard crossbeam processing method and a dashboard crossbeam to solve or improve the problem in the related art that the mechanical properties of the crossbeam are improved by controlling the defect content and impurity content of the material, resulting in high production costs and great production difficulty.

[0005] In a first aspect, the present invention provides a method for processing a dashboard cross beam, wherein the dashboard cross beam is processed by injection molding, and during the process of injection molding the dashboard cross beam, the method comprises:

[0006] In a first time period, injection molding is performed using injection molding parameters of a first injection speed and a first screw speed;

[0007] In the second time period, injection molding is performed using injection molding parameters of a second injection speed and a second screw speed;

[0008] Wherein, the first injection speed is greater than the second injection speed, and the first screw speed is greater than or equal to the second screw speed.

[0009] In an optional embodiment, the first screw speed ranges from 200 r / min to 500 r / min.

[0010] In an optional implementation, the second screw speed ranges from 200 r / min to 500 r / min.

[0011] In an optional implementation, the first injection speed has a value range of 50% to 99% of the maximum injection speed of the injection molding machine.

[0012] In an optional implementation, the second injection speed has a value range of 25% to 60% of the maximum injection speed of the injection molding machine.

[0013] In an optional embodiment, the injection temperature in the first time period ranges from 260° C. to 310° C.;

[0014] And / or, the injection temperature in the second time period ranges from 260°C to 310°C.

[0015] In an optional embodiment, a reinforcing rib structure is provided on the inner wall of the instrument panel cross beam.

[0016] In an optional embodiment, the reinforcing rib structure includes a plurality of hexagonal ring structures adjacent to each other.

[0017] In an optional implementation, the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam is 25% to 35% of the wall thickness of the instrument panel cross beam.

[0018] In a second aspect, the present invention further provides an instrument panel cross beam, which is processed based on the instrument panel cross beam processing method as described above.

[0019] The instrument panel cross beam processing method provided by the present invention is configured so that the orientation of the glass fibers in the instrument panel cross beam is increased by increasing the injection speed in the first time period, thereby increasing the tensile modulus of the instrument panel cross beam. In addition, by increasing the orientation of the glass fibers, when the glass fibers are arranged along the force direction, the stress can be transmitted more effectively, reducing the mutual movement between the plastic polymer chains, thereby reducing the creep of the instrument panel cross beam and improving the creep resistance of the instrument panel cross beam.

[0020] By reducing the injection speed in the second time period, the shear force generated when the screw pushes the melt can be reduced, so that the mechanical damage to the glass fiber is reduced, which helps to maintain the integrity of the glass fiber and reduce the breakage phenomenon. The length of the glass fiber can be maintained so that the long and short glass fibers are intertwined with each other, thereby improving the tensile strength of the dashboard cross beam. In addition, by intertwining the long and short glass fibers, the long glass fibers can provide better strength and modulus, and the short glass fibers can help disperse stress and act as a bridge between the long glass fibers, reducing local stress concentration and reducing the risk of defect formation. The interaction between the long and short glass fibers can reduce the plastic flow in the plastic matrix, thereby improving the creep resistance of the dashboard cross beam.

[0021] In summary, the instrument panel cross beam processing method provided in the embodiment of the present invention can optimize the distribution of glass fibers by simply adjusting the injection molding parameters of the first time period and the second time period, thereby improving the mechanical properties of the instrument panel cross beam, for example, improving the tensile modulus, strength and creep resistance of the instrument panel cross beam. Compared with the related art that requires precise control of the content of defects and impurities, it can reduce production costs and production difficulties.

[0022] The instrument panel cross beam provided by the present invention is processed by the instrument panel cross beam processing method provided by the present invention, and therefore simultaneously includes all the above advantages of the instrument panel cross beam processing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic structural diagram of the reinforcing rib structure of the instrument panel cross beam provided in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Instrument panel cross beam; 101. Hexagonal ring structure. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] Combine the following Figure 1 , describing the instrument panel crossbeam processing method provided in an embodiment of the present invention.

[0029] Specifically, the instrument panel cross beam processing method uses injection molding to process the instrument panel cross beam 1, and the process of injection molding the instrument panel cross beam 1 includes:

[0030] In the first time period, injection molding is performed using injection molding parameters of a first injection speed and a first screw rotation speed.

[0031] In the second time period, injection molding is performed using injection molding parameters of a second injection speed and a second screw rotation speed.

[0032] The first injection speed is greater than the second injection speed, and the first screw rotation speed is greater than or equal to the second screw rotation speed.

[0033] In this embodiment, the injection molding process includes a first time period and a second time period, and the first injection speed in the first time period is greater than the second injection speed in the second time period, and the first screw speed in the first time period is greater than or equal to the second screw speed in the second time period.

[0034] With such arrangement, by increasing the injection speed in the first time period, the orientation of the glass fibers in the instrument panel cross beam 1 is increased, thereby increasing the tensile modulus of the instrument panel cross beam 1; in addition, by increasing the orientation of the glass fibers, when the glass fibers are arranged along the force direction, stress can be transferred more effectively, reducing the mutual movement between the plastic polymer chains, thereby reducing the creep of the instrument panel cross beam 1 and improving the creep resistance of the instrument panel cross beam 1.

[0035] By reducing the injection speed in the second time period, the shear force generated when the screw pushes the melt can be reduced, so that the mechanical damage to the glass fiber is reduced, which helps to maintain the integrity of the glass fiber and reduce the breakage phenomenon. The length of the glass fiber can be maintained so that the long and short glass fibers are intertwined with each other, thereby improving the tensile strength of the dashboard cross beam 1. In addition, by intertwining the long and short glass fibers, the long glass fibers can provide better strength and modulus, and the short glass fibers can help disperse stress and act as a bridge between the long glass fibers, reducing local stress concentration and reducing the risk of defect formation. The interaction between the long and short glass fibers can reduce the plastic flow in the plastic matrix, thereby improving the creep resistance of the dashboard cross beam 1.

[0036] In summary, the dashboard cross beam processing method provided in the embodiment of the present invention can optimize the distribution of glass fibers by simply adjusting the injection molding parameters of the first time period and the second time period, thereby improving the mechanical properties of the dashboard cross beam 1, for example, improving the tensile modulus, strength and creep resistance of the dashboard cross beam 1. Compared with the related art that requires precise control of the content of defects and impurities, it can reduce production costs and production difficulties.

[0037] The above is a theoretical derivation of the beneficial effects. Referring to Table 1 and Table 2, the inventors found that the tensile modulus of the injection-molded beam is positively correlated with the injection speed, and the tensile strength of the injection-molded beam is negatively correlated with the screw speed. For example, Table 1 below provides experimental data that the tensile modulus is positively correlated with the injection speed, Table 2 provides experimental data that the tensile strength is negatively correlated with the screw speed, and Table 3 provides experimental data of some embodiments and comparative examples provided by the present invention.

[0038] Table 1

[0039] Serial number Injection speed Tensile modulus 1 25％ 12000 2 40％ 12830 3 50％ 13013 4 70％ 16500 5 80％ 17060 6 99％ 17800

[0040] Table 2

[0041] Serial number Screw speed Tensile Strength 1 200r / min 246MPa 2 250r / min 242MPa 3 350r / min 233MPa 4 400r / min 228MPa 5 500r / min 218MPa

[0042] Table 3

[0043]

[0044] As shown in Tables 1 to 3, in some embodiments provided by the present invention, the first screw speed ranges from 200 r / min to 500 r / min. For example, as shown in Table 3, the first screw speed can be 200 r / min, 300 r / min, and 500 r / min. By making the first screw speed between 200 r / min and 500 r / min, it is possible to ensure that the glass fibers in the instrument panel cross beam 1 are mixed evenly and to avoid the glass fibers being too short.

[0045] In this embodiment, if the first screw speed is less than 200r / min, the screw and the glass fiber are in contact for too long, and the screw acts on the glass fiber for too long, so that the glass fiber is subjected to greater mechanical damage, resulting in a shorter length of the glass fiber. Too short glass fibers are not conducive to improving the strength and creep resistance of the instrument panel cross beam 1. In addition, if the speed is lower than 200r / min, the mixing effect of the screw on the glass fiber is poor, so that the dispersion effect of the glass fiber is not good, resulting in a decrease in the strength of the instrument panel cross beam 1. If the first screw speed is greater than 500r / min, the screw speed is too high, and the screw is prone to idling. Similarly, the mixing effect on the glass fiber is poor, so that the dispersion effect of the glass fiber is not good, resulting in a decrease in the strength of the instrument panel cross beam 1. In addition, as shown in Table 2, as the screw speed gradually increases in the range of 200r / min to 500r / min, the tensile strength of the material decreases significantly, and the tensile strength is the smallest when the screw speed is 500r / min, so the first screw speed should not be greater than 500r / min.

[0046] It can be seen that by setting the first screw speed to 200 r / min to 500 r / min, it is possible to ensure that the glass fibers in the instrument panel cross beam 1 are evenly mixed and to avoid the glass fibers being too short.

[0047] As shown in Tables 1 to 3, in some embodiments provided by the present invention, the second screw speed ranges from 200 r / min to 500 r / min. For example, as shown in Table 3, the second screw speed can be 200 r / min, 300 r / min, and 500 r / min. By making the second screw speed between 200 r / min and 500 r / min, it is possible to ensure that the glass fibers in the instrument panel cross beam 1 are mixed evenly and to avoid the glass fibers being too short.

[0048] In this embodiment, if the second screw speed is less than 200r / min, the contact time between the screw and the glass fiber is too long, and the screw acts on the glass fiber for too long, resulting in a shortened length of the glass fiber. Too short glass fibers are not conducive to improving the strength and creep resistance of the instrument panel cross beam 1. In addition, if the speed is lower than 200r / min, the mixing effect of the screw on the glass fiber is poor, resulting in poor dispersion of the glass fiber, resulting in reduced strength of the instrument panel cross beam 1. If the second screw speed is greater than 500r / min, the screw speed is too high, the screw is prone to idling, and the mixing effect on the glass fiber is poor, resulting in poor dispersion of the glass fiber, resulting in reduced strength of the instrument panel cross beam 1. Similarly, as shown in Table 2, as the screw speed gradually increases within the range of 200r / min to 500r / min, the tensile strength of the material decreases significantly, and the tensile strength is the smallest when the screw speed is 500r / min, so the first screw speed should not be greater than 500r / min.

[0049] It can be seen that by setting the second screw speed to 200 r / min to 500 r / min, it is possible to ensure that the glass fibers in the instrument panel cross beam 1 are evenly mixed and to avoid the glass fibers being too short.

[0050] In some embodiments provided by the present invention, the value range of the first injection speed is 50% to 99% of the maximum injection speed of the injection molding machine. For example, as shown in Table 3, the first injection speed can be 50%, 60%, 70%, 80% or 99% of the maximum injection speed of the injection molding machine. It should be noted that the maximum injection speed of the injection molding machine is related to the model and tonnage of the injection molding machine. For example, it can be but not limited to the injection molding machine model 3300T produced by Haitian manufacturer, and its maximum injection speed is 500mm / s. By making the first injection speed 50% to 99% of the maximum injection speed of the injection molding machine, it can ensure that the glass fiber in the dashboard cross beam 1 is evenly mixed, and can avoid poor creep resistance caused by excessive shear stress, which can make the comprehensive performance excellent.

[0051] In this embodiment, if the first injection speed is less than 50% of the maximum injection speed of the injection molding machine, the glass fiber mixing effect is poor, and the dispersion effect of the glass fiber is not good, resulting in a decrease in the strength of the dashboard beam 1. And if the first injection speed is less than 50% of the maximum injection speed of the injection molding machine, the first time period is too long, which is easy to affect the processing efficiency. If the first injection speed is greater than 99% of the maximum injection speed of the injection molding machine, the shear stress and the orientation of the glass fiber are increased, which is easy to cause warping deformation and poor creep resistance. It can be seen that by setting the first injection speed to 50% to 99%, it can not only ensure that the glass fibers in the dashboard beam 1 are evenly mixed, but also avoid poor creep resistance caused by excessive shear stress.

[0052] In some embodiments provided by the present invention, the second injection speed is in the range of 25% to 60% of the maximum injection speed of the injection molding machine. For example, as shown in Table 3, the second injection speed can be 25%, 35%, 45%, 50% or 60% of the maximum injection speed of the injection molding machine. By setting the second injection speed to 25% to 60% of the maximum injection speed of the injection molding machine, it is possible to avoid the problem of the material filling the mold cavity for too long, resulting in cooling stratification, and to avoid the glass fiber from making rapid axial movement along the flow direction, resulting in the "spraying" phenomenon at the nozzle or gate.

[0053] In this embodiment, if the second injection speed is less than 25% of the maximum injection speed of the injection molding machine, the glass fiber reinforced plastic takes too long to fill the mold cavity, cooling stratification occurs, and the tensile strength and tensile modulus are reduced. In addition, as shown in Table 1, as the injection speed gradually decreases within the range of 25% to 99% of the maximum injection speed of the injection molding machine, the tensile modulus of the material decreases significantly, and the tensile modulus is the smallest when the injection speed is 25% of the maximum injection speed of the injection molding machine. Therefore, the second injection speed should not be less than 25% of the maximum injection speed of the injection molding machine. If the second injection speed is greater than 60% of the maximum injection speed of the injection molding machine, the glass fiber moves rapidly axially along the flow direction, and a "jetting" phenomenon occurs at the nozzle or gate, forming a serpentine defect, which affects the appearance of the plastic part.

[0054] In some embodiments provided by the present invention, the injection molding temperature in the first time period ranges from 260°C to 310°C. It should be noted that the injection molding temperature is the barrel temperature. For example, the injection molding temperature may be 260°C, 280°C, 300°C or 310°C. By setting the injection molding temperature at 260°C to 310°C, the dispersion uniformity of the glass fiber can be higher and the decomposition of the nylon body can be avoided.

[0055] In this embodiment, if the injection molding temperature is less than 260° C., the melting is uneven, the glass fiber dispersion is poor, and the tensile strength and tensile modulus are low. If the injection molding temperature is greater than 310° C., the nylon body is decomposed and the strength is reduced.

[0056] In some embodiments provided by the present invention, the injection molding temperature in the second time period ranges from 260° C. to 310° C. For example, the injection molding temperature may be 260° C., 280° C., 300° C., or 310° C. By setting the injection molding temperature at 260° C. to 310° C., the dispersion uniformity of the glass fiber can be higher and the decomposition of the nylon body can be avoided.

[0057] In this embodiment, if the injection molding temperature is less than 260° C., the melting is uneven, the glass fiber dispersion is poor, and the tensile strength and tensile modulus are low. If the injection molding temperature is greater than 310° C., the nylon body is decomposed and the strength is reduced.

[0058] Referring to Table 3, in some embodiments provided by the present invention, in the first time period, the injection molding is performed using the injection parameters of the first injection speed of 50% and the first screw speed of 300 r / min. In the second time period, the injection molding is performed using the injection parameters of the second injection speed of 25% and the second screw speed of 200 r / min. The tensile modulus of the final instrument panel cross beam is 18000 MPa and the tensile strength is 220 MPa.

[0059] Referring to Table 3, in some embodiments provided by the present invention, in the first time period, the injection molding is performed using the injection parameters of the first injection speed of 60% and the first screw speed of 300 r / min. In the second time period, the injection molding is performed using the injection parameters of the second injection speed of 35% and the second screw speed of 200 r / min. The tensile modulus of the final instrument panel cross beam is 19080 MPa and the tensile strength is 227 MPa.

[0060] Referring to Table 3, in some embodiments provided by the present invention, in the first time period, the injection molding is performed using the injection parameters of the first injection speed of 70% and the first screw speed of 300 r / min. In the second time period, the injection molding is performed using the injection parameters of the second injection speed of 45% and the second screw speed of 200 r / min. The tensile modulus of the final instrument panel cross beam is 20300 MPa and the tensile strength is 231 MPa.

[0061] Referring to Table 3, in some embodiments provided by the present invention, in the first time period, the injection molding is performed using the injection parameters of the first injection speed of 80% and the first screw speed of 300 r / min. In the second time period, the injection molding is performed using the injection parameters of the second injection speed of 50% and the second screw speed of 200 r / min. Finally, the tensile modulus of the instrument panel cross beam is 21000 MPa and the tensile strength is 236 MPa.

[0062] Referring to Table 3, in some embodiments provided by the present invention, in the first time period, the injection molding is performed using the injection parameters of the first injection speed of 99% and the first screw speed of 300 r / min. In the second time period, the injection molding is performed using the injection parameters of the second injection speed of 60% and the second screw speed of 200 r / min. The tensile modulus of the final instrument panel cross beam is 214000 MPa and the tensile strength is 245 MPa.

[0063] Referring to Table 3, in some embodiments provided by the present invention, in the first time period, the injection molding is performed using the injection parameters of the first injection speed of 80% and the first screw speed of 200 r / min. In the second time period, the injection molding is performed using the injection parameters of the second injection speed of 50% and the second screw speed of 200 r / min. The tensile modulus of the final instrument panel cross beam is 210000 MPa and the tensile strength is 245 MPa.

[0064] Referring to Table 3, in some embodiments provided by the present invention, in the first time period, the injection molding is performed using the injection parameters of the first injection speed of 80% and the first screw speed of 500 r / min. In the second time period, the injection molding is performed using the injection parameters of the second injection speed of 50% and the second screw speed of 500 r / min. The tensile modulus of the final instrument panel cross beam is 21000 MPa and the tensile strength is 245 MPa.

[0065] Referring to Table 3, in the comparative example provided by the present invention, when the injection speeds in the first time period and the second time period are the same, or the injection speed in the second time period is greater than the injection speed in the first time period, the tensile modulus and tensile strength of the dashboard cross beam both decrease. Therefore, in the present application, adopting an injection speed in the second time period that is greater than the injection speed in the first time period can effectively improve the performance of the dashboard cross beam.

[0066] In some embodiments provided by the present invention, a reinforcing rib structure is provided on the inner wall of the instrument panel cross beam 1. In this embodiment, the provision of the reinforcing rib increases the rigidity of the instrument panel cross beam 1 from a macroscopic perspective, and reduces the deformation of the instrument panel cross beam 1 when subjected to force, and by changing the injection molding parameters of the first time period and the second time period, the distribution of the glass fiber can be optimized from a microscopic perspective, thereby improving the overall mechanical properties of the instrument panel cross beam 1, that is, this embodiment improves the mechanical properties of the instrument panel cross beam 1 and reduces the creep of the instrument panel cross beam 1 during use by combining macroscopic and microscopic methods.

[0067] In addition, the presence of reinforcing ribs enhances the local strength and rigidity of the instrument panel cross beam 1. That is, by providing reinforcing ribs on the inner wall of the instrument panel cross beam 1, the strength and rigidity of the cross beam at key locations can be significantly improved without increasing the overall wall thickness. By changing the injection molding parameters in two time periods and optimizing the distribution of glass fibers, the overall mechanical properties of the instrument panel cross beam 1 are improved. There is a synergistic enhancement effect between these two methods. Specifically, the presence of reinforcing ribs provides better support and fixation for the glass fibers, allowing the glass fibers to better exert their reinforcement effects; and the addition of glass fibers further enhances the bonding force between the reinforcing ribs and the plastic matrix, improving the integrity and stability of the entire instrument panel cross beam 1.

[0068] In some embodiments provided by the present invention, the reinforcing rib structure includes a plurality of hexagonal ring structures 101 adjacent to each other. In this embodiment, the hexagonal ring structure 101 itself has good stability, can disperse and transfer stress more effectively, and can also ensure that the reinforcing rib can evenly disperse the stress to the entire structure when subjected to external force, thereby reducing the phenomenon of stress concentration. The hexagonal ring structure 101 can also optimize the stress transfer path, making the stress distribution in the structure more reasonable, which helps to improve the load-bearing capacity and overall stability of the dashboard cross beam 1. In addition, the shape of the hexagonal ring structure 101 is relatively simple and regular, so it is easier to process and shape during the manufacturing process, thereby helping to reduce production difficulty and improve production efficiency.

[0069] In some embodiments provided by the present invention, the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 is 25% to 35% of the wall thickness of the instrument panel cross beam 1. For example, the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 is 25%, 30% or 35% of the wall thickness of the instrument panel cross beam 1. By setting the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 to 25% to 35% of the wall thickness of the instrument panel cross beam 1, the supporting performance of the reinforcing rib structure can be ensured, and the weight of the instrument panel cross beam 1 can be prevented from increasing too much.

[0070] In this embodiment, if the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 is less than 25% of the wall thickness of the instrument panel cross beam 1, the height of the reinforcing rib structure is too small, resulting in poor support effect of the reinforcing rib and inability to effectively resist bending deformation, resulting in reduced bending resistance of the instrument panel cross beam 1. If the height of the reinforcing rib is too small, it may not be able to effectively restrict the plastic flow in the plastic matrix, thereby reducing the creep resistance of the instrument panel cross beam 1. When the protruding height of the reinforcing rib is too small, its root is also prone to become a stress concentration area. When subjected to external forces, these areas are more likely to be damaged, thereby affecting the overall performance and service life of the plastic instrument panel cross beam 1.

[0071] If the height of the rib structure is greater than 35% of the wall thickness of the instrument panel cross beam 1, the material used for the rib structure will increase, which will eventually increase the weight of the instrument panel cross beam 1, affecting the cost and lightweight effect of the instrument panel cross beam 1. In addition, ribs with too large height may require more complex mold design, increasing the difficulty and cost of mold manufacturing, and if the rib height is too large, the rib may get stuck or stick during demolding, increasing the difficulty of demolding.

[0072] An embodiment of the present invention further provides a dashboard cross beam 1 .

[0073] Specifically, the instrument panel cross member 1 is processed based on the instrument panel cross member processing method described above.

[0074] It should be noted that the instrument panel cross beam 1 is processed by the instrument panel cross beam processing method, so the instrument panel cross beam 1 naturally has all the above advantages of the instrument panel cross beam processing method, so it will not be described in detail.

[0075] In some embodiments provided by the present invention, a reinforcing rib structure is provided on the inner wall of the instrument panel cross beam 1. In this embodiment, the provision of the reinforcing rib increases the rigidity of the instrument panel cross beam 1 from a macroscopic perspective, and reduces the deformation of the instrument panel cross beam 1 when subjected to force, and by changing the injection molding parameters of the first time period and the second time period, the distribution of the glass fiber can be optimized from a microscopic perspective, thereby improving the mechanical properties of the instrument panel cross beam 1, that is, this embodiment improves the mechanical properties of the instrument panel cross beam 1 and reduces the creep of the instrument panel cross beam 1 during use by combining the macroscopic and microscopic methods.

[0076] In addition, the presence of reinforcing ribs enhances the local strength and rigidity of the instrument panel cross beam 1. That is, by providing reinforcing ribs on the inner wall of the instrument panel cross beam 1, the strength and rigidity of the cross beam at key locations can be significantly improved without increasing the overall wall thickness. By changing the injection molding parameters in two time periods and optimizing the distribution of glass fibers, the overall mechanical properties of the instrument panel cross beam 1 are improved. There is a synergistic enhancement effect between these two methods. Specifically, the presence of reinforcing ribs provides better support and fixation for the glass fibers, allowing the glass fibers to better exert their reinforcement effects; and the addition of glass fibers further enhances the bonding force between the reinforcing ribs and the plastic matrix, improving the integrity and stability of the entire instrument panel cross beam 1.

[0077] In some embodiments provided by the present invention, the reinforcing rib structure includes a plurality of hexagonal ring structures 101 adjacent to each other. In this embodiment, the hexagonal ring structure 101 itself has good stability, can disperse and transfer stress more effectively, and can also ensure that the reinforcing rib can evenly disperse the stress to the entire structure when subjected to external force, thereby reducing the phenomenon of stress concentration. The hexagonal ring structure 101 can also optimize the stress transfer path, making the stress distribution in the structure more reasonable, which helps to improve the load-bearing capacity and overall stability of the dashboard cross beam 1. In addition, the shape of the hexagonal ring structure 101 is relatively simple and regular, so it is easier to process and shape during the manufacturing process, thereby helping to reduce production difficulty and improve production efficiency.

[0078] In some embodiments provided by the present invention, the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 is 25% to 35% of the wall thickness of the instrument panel cross beam 1. For example, the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 is 25%, 30% or 35% of the wall thickness of the instrument panel cross beam 1. By setting the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 to 25% to 35% of the wall thickness of the instrument panel cross beam 1, the supporting performance of the reinforcing rib structure can be ensured, and the weight of the instrument panel cross beam 1 can be prevented from increasing too much.

[0079] In this embodiment, if the height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam 1 is less than 25% of the wall thickness of the instrument panel cross beam 1, the height of the reinforcing rib structure is too small, resulting in poor support effect of the reinforcing rib and inability to effectively resist bending deformation, resulting in reduced bending resistance of the instrument panel cross beam 1. If the height of the reinforcing rib is too small, it may not be able to effectively restrict the plastic flow in the plastic matrix, thereby reducing the creep resistance of the instrument panel cross beam 1. When the protruding height of the reinforcing rib is too small, its root is also prone to become a stress concentration area. When subjected to external forces, these areas are more likely to be damaged, thereby affecting the overall performance and service life of the plastic instrument panel cross beam 1.

[0080] If the height of the rib structure is greater than 35% of the wall thickness of the instrument panel cross beam 1, the material used for the rib structure will increase, which will eventually increase the weight of the instrument panel cross beam 1, affecting the cost and lightweight effect of the instrument panel cross beam 1. In addition, ribs with too large height may require more complex mold design, increasing the difficulty and cost of mold manufacturing, and if the rib height is too large, the rib may get stuck or stick during demolding, increasing the difficulty of demolding.

[0081] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for processing a dashboard crossbeam, characterized in that: The instrument panel cross beam (1) is processed by injection molding, and the process of injection molding the instrument panel cross beam (1) includes: In a first time period, injection molding is performed using injection molding parameters of a first injection speed and a first screw speed; In the second time period, injection molding is performed using injection molding parameters of a second injection speed and a second screw speed; Wherein, the first injection speed is greater than the second injection speed, and the first screw speed is greater than or equal to the second screw speed.

2. The instrument panel crossbeam processing method according to claim 1, characterized in that: The value range of the first injection speed is 50% to 99% of the maximum injection speed of the injection molding machine.

3. The instrument panel cross beam processing method according to claim 1, characterized in that: The value range of the second injection speed is 25% to 60% of the maximum injection speed of the injection molding machine.

4. The instrument panel crossbeam processing method according to claim 1, characterized in that: The first screw speed ranges from 200 r / min to 500 r / min.

5. The instrument panel cross beam processing method according to claim 1, characterized in that: The second screw speed ranges from 200 r / min to 500 r / min.

6. The instrument panel crossbeam processing method according to claim 1, characterized in that: The injection temperature in the first time period ranges from 260°C to 310°C; And / or, the injection temperature in the second time period ranges from 260°C to 310°C.

7. The method for processing an instrument panel crossbeam according to any one of claims 1 to 6, characterized in that: The inner wall of the instrument panel cross beam (1) is provided with a reinforcing rib structure.

8. The method for processing a dashboard crossbeam according to claim 7, characterized in that: The reinforcing rib structure comprises a plurality of hexagonal ring structures (101) adjacent to each other.

9. The method for processing a dashboard crossbeam according to claim 7, characterized in that: The height of the reinforcing rib structure protruding from the inner wall of the instrument panel cross beam (1) is 25% to 35% of the wall thickness of the instrument panel cross beam (1).

10. A dashboard cross beam, characterized in that: The instrument panel cross beam is processed based on the instrument panel cross beam processing method as described in any one of claims 1 to 9.

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