Lightweight high-pressure die-casting aluminum alloy doorsill plate

Abstract

The invention relates to the technical field of automobile doorsill plates, in particular to a lightweight high-pressure die-casting aluminum alloy doorsill plate which comprises a main body, a movable die side and a fixed die side, and the main body comprises an automobile body longitudinal beam mounting surface, a main driving doorsill beam mounting surface, a B column mounting point, a C column mounting surface, a sliding rail mounting point, a battery frame mounting point, a middle floor mounting surface and a side wall mounting surface. The vehicle body longitudinal beam mounting surface and the sliding rail mounting point are arranged on the fixed mold side, the battery frame mounting point and the side wall mounting surface are arranged on the movable mold side, the main driving threshold beam mounting surface is arranged on one side of the main body in the width direction, and the B column mounting point is arranged on one side of the main body in the width direction and is adjacent to the main driving threshold beam mounting surface; the C-column mounting surface is arranged on the other side of the main body in the width direction; and the middle bottom plate mounting surface is arranged on one side, close to the width of the C-column mounting surface, of the fixed mold side. The method has the following effects that the problems of numerous parts, tedious working procedures, complex assembly, difficulty in tolerance control and the like of the structural part in punch forming are solved, and the problems of surface defects and internal defects of the structural part, insufficient dimensional precision of the structural part, unreasonable mechanical property of the structural part and the like caused by an integrated die casting technology are also solved.

Description

Technical Field

[0001] This application relates to the field of die-casting processing of vehicle structural parts, and particularly to a lightweight high-pressure die-cast aluminum alloy sill plate. Background Art

[0002] Currently, most body structures are formed by stamping.

[0003] The related technology can refer to the Chinese patent with the publication number CN113478178B, which discloses a new type of hot-formed sill plate. The sill plate is made of an alloy plate through a processing technology including blanking, surface treatment, austenitization, hot stamping forming, laser cutting, and post-treatment in sequence. The processing technology specifically includes the following steps: stamping the alloy plate to obtain a blank with the required outer contour; performing carburizing treatment on the blank obtained by stamping and then performing surface high-frequency quenching treatment; heating and insulating the blank after surface treatment to austenitize the blank, and then transferring the insulated blank to a stamping die; pressing down the upper die and quickly closing the die with the lower die to perform hot forming on the blank and then holding the pressure, and cooling the formed blank during the pressure holding process to obtain a formed plate; performing cutting treatment on the formed plate according to product requirements; and performing shot peening treatment on the formed plate and then packaging it.

[0004] Regarding the above related technology, the production process of the new type of hot-formed sill plate involves a variety of metallurgical processes and a variety of machining processes, solving the problems that the lightweight automotive structural parts are prone to cracks, cracking, deformation and other defects, and solving the problems that the strength and hardness of the components formed by the alloy plate after lightweight are not excellent enough and the service life cannot fully meet the automotive use requirements. However, the above related technology cannot produce the overall designed automotive structural components. With the further development of industrialization, the application cost of the above technology continues to climb, and a large number of traditional automobile enterprises go bankrupt due to their inability to bear the high production costs. The automotive manufacturing industry urgently needs to combine with advanced disciplines and introduce and catalyze new production technologies to reduce production costs. Currently, technicians in the relevant industries believe that the integrated die-casting technology can already be applied to the production of the overall designed automotive structural components.

[0005] However, in the existing integrated die-casting technology, there are problems such as numerous parts of the structural parts, cumbersome processes, complex assembly, and difficult tolerance control in stamping forming. At the same time, in actual production, there are also problems such as surface defects and internal defects of the structural parts generated by the integrated die-casting technology, insufficient dimensional accuracy of the structural parts, and unreasonable mechanical properties of the structural parts. Summary of the Invention

[0006] To solve the deficiencies of the prior art, this application provides a lightweight high-pressure die-cast aluminum alloy sill plate.

[0007] The present application provides a lightweight high-pressure die-cast aluminum alloy door sill panel, adopting the following technical solution: A lightweight high-pressure die-cast aluminum alloy door sill panel includes a main body, a moving die side, and a fixed die side. The main body is an integrally die-cast structural member. The moving die side is the contact surface of the main body on the side of the moving die of the die-casting machine during die-casting operations. The fixed die side is the contact surface of the main body on the side of the fixed die of the die-casting machine during die-casting operations. The main body includes a body longitudinal beam mounting surface, a driver's door sill beam mounting surface, a B-pillar mounting point, a C-pillar mounting surface, a slide rail mounting point, a battery frame mounting point, a middle floor mounting surface, and a side wall mounting surface. The body longitudinal beam mounting surface and the slide rail mounting point are arranged on the fixed die side. The battery frame mounting point and the side wall mounting surface are arranged on the moving die side. The driver's door sill beam mounting surface is arranged on one side of the main body in its own width direction. The B-pillar mounting point is arranged on one side in the width direction of the main body and is adjacent to the driver's door sill beam mounting surface. The C-pillar mounting surface is arranged on the other side in the width direction of the main body. The middle floor mounting surface is arranged on the width side close to the C-pillar mounting surface on the fixed die side.

[0008] By adopting the above technical solution, the main body is integrally designed. The body longitudinal beam mounting surface, the driver's door sill beam mounting surface, the B-pillar mounting point, the C-pillar mounting surface, the slide rail mounting point, the battery frame mounting point, the middle floor mounting surface, and the side wall mounting surface are integrally designed, optimizing the numerous workpieces and complicated processes and reducing the complexity of component reduction. The characteristic design takes the dimensions and performance of automotive structural parts previously produced by stamping processes as the design goal, and combines topology optimization and finite element simulation technology in actual production to optimize the structure of the main body, ensuring the feasibility of integration.

[0009] Optionally, a cross-shaped reinforcing rib is provided on one side of the moving die side of the main body. The rib ridge of the cross-shaped reinforcing rib is a "C"-shaped rib. The battery frame mounting points are evenly arranged along the length direction of the main body. The wall thickness at the connection of the cross-shaped reinforcing rib and the battery frame mounting point is one-sixth thicker than the wall thickness of the main body at the position of the moving die side.

[0010] By adopting the above technical solution, the cross-shaped reinforcing rib is arranged on the moving die side to ensure the rigidity of the battery frame mounting points also arranged on the moving die side. Since the battery frame mounting points are cylindrical features and the height of these features far exceeds the thickness of the main body, in order to meet the overall stiffness requirements of the main body, the main body stiffness is strengthened by using the cross-shaped reinforcing rib feature for the battery frame mounting points.

[0011] Optionally, one side of the fixed mold side of the main body is provided with gradually changing non-uniform stiffening ribs. During the process from the end close to the B-pillar mounting point to the side close to the C-pillar mounting surface, the spacing of the gradually changing non-uniform stiffening ribs gradually increases. The rule of the spacing increase is determined through finite element analysis. The wall thickness of the gradually changing non-uniform stiffening ribs is one-sixth thicker than the wall thickness of the main body at the fixed mold side position. The slide rail mounting point is arranged below the low point of the gradually changing non-uniform stiffening ribs. The vehicle body longitudinal beam mounting surface is provided with a demolding slope and a demolding crack.

[0012] By adopting the above technical solution, the fixed mold side of the main body uses gradually changing non-uniform stiffening ribs to reinforce the stiffness of the guide rail mounting point and the vehicle body longitudinal beam mounting surface on the fixed mold side of the main body. Taking the modal vibration mode and amplitude as the calculation targets, the main body is analyzed through finite element simulation dynamics analysis. The information obtained from the post-processing is analyzed, and the rib spacing and rib length of the gradually changing non-uniform stiffening ribs are adjusted to optimize the modal vibration mode and amplitude of the main body. At the same time, since the position where the gradually changing non-uniform stiffening ribs are connected to the main body belongs to the position where the metal flow direction changes suddenly, this position is prone to solidify first, cutting off the feeding channel of the molten metal. Therefore, this technical problem is solved by thickening the wall thickness of the gradually changing non-uniform stiffening ribs.

[0013] Optionally, the driver's side sill beam mounting surface is connected to the outside through aluminum-aluminum welding and hot melt spin riveting. The driver's side sill beam mounting surface is divided into two types of surface shapes and three mounting surfaces. One type of surface shape is the riveting flange surface, and the other type of surface shape is the aluminum-aluminum welding surface. There are two riveting flange surfaces in total, and there is one aluminum-aluminum welding surface in total. The aluminum-aluminum welding surface is parallel to the moving mold side. The two riveting flange surfaces form an "L" shape, and one of the two riveting flange surfaces is parallel to the moving mold side.

[0014] By adopting the above technical solution, the driver's side sill beam mounting surface needs to be connected to the driver's side sill beam. Due to the arrangement of the main body in the assembly process sequence, it is necessary to first connect the driver's side sill beam to the main body and then enter the next process. Therefore, it is necessary to first weld the main body to the driver's side sill beam on the vehicle assembly line using the welding process. Since the main body is a die-cast part, its welding performance is relatively poor, and it cannot guarantee the performance of the welding position during actual operation. Therefore, it is necessary to use the hot melt spin riveting process to connect the main body to the driver's side sill beam.

[0015] Optionally, the B-pillar mounting point is provided with through holes with two hole diameters as reserved holes for the hot melt spin riveting process. The B-pillar mounting point faces the moving mold side, and the riveting surface of the hot melt spin riveting is perpendicular to the moving mold side and the gradually changing non-uniform stiffening ribs.

[0016] By adopting the above technical solutions, since the B-pillar of the vehicle is the vertical pillar between the front and rear doors and is an important load-bearing structural component in the vehicle structure and one of the important structures for the vehicle to resist side impacts, the connection performance requirements of the vehicle B-pillar on the main body are extremely high. The conclusion that there are through holes with two apertures at the B-pillar mounting points as reserved holes for the hot melt spin riveting process is obtained through multiple static and dynamic analysis calculations using finite element analysis. At the same time, the riveting surface of the hot melt spin riveting is perpendicular to the moving die side and the gradually changing non-uniform reinforcing ribs, ensuring the dimensional accuracy when the B-pillar is connected to the main body.

[0017] Optionally, the C-pillar mounting surface is connected to the outside through self-piercing rivets. The riveting surface of the self-piercing rivets is perpendicular to the fixed die side, and the riveting surface of the self-piercing rivets is parallel to the gradually changing non-uniform reinforcing ribs.

[0018] By adopting the above technical solutions, the C-pillar mounting surface is the mounting surface of the main body for connecting with the vehicle C-pillar. The main body is connected to the vehicle C-pillar through self-piercing rivets. Since the vehicle C-pillar is a load-bearing structural member in the vehicle structure in the area of the rear door and the tail of the vehicle, while ensuring the installation quality of the window and the roof, it is also necessary to solve the collision performance problem in the area of the vehicle's rear door. The purpose of "the riveting surface of the self-piercing rivets is parallel to the gradually changing non-uniform reinforcing ribs" is to ensure the dimensional accuracy in the vehicle assembly process, thereby ensuring the collision performance in the area of the vehicle's rear door.

[0019] Optionally, the sidewall mounting surface is arranged along the length direction of the main body. The sidewall mounting surface is divided into a high surface and a low surface. The sidewall mounting surface is perpendicular to the moving die side, and the low surface is arranged at the edge of the main body. The high surface is arranged between the battery frame mounting point and the low surface. The cross-shaped reinforcing ribs surround the battery frame mounting point and the sidewall mounting surface.

[0020] By adopting the above technical solutions, the sidewall mounting surface is the mounting surface of the main body for connecting with the vehicle sidewall structural components. Since the overall size of the vehicle sidewall structural components is much larger than that of the sill panel, in actual assembly, it is necessary to ensure that the distal end of the connection between the vehicle sidewall structural components and the sill panel does not have excessive deflection, thereby affecting the assembly dimensional accuracy and mechanical properties. Therefore, the sidewall mounting surface needs to be divided into two surfaces, and the two surfaces are arranged staggered up and down to constrain and strengthen the structure of the proximal end of the connection end, greatly improving the structural stiffness of the vehicle sidewall structural components during assembly.

[0021] Optionally, the middle floor mounting surface is divided into two surfaces, the two surfaces are perpendicular to each other, and both surfaces are perpendicular to the moving die side. The middle floor mounting surface is connected to the outside through hot melt spin riveting.

[0022] By adopting the above technical solution, the middle floor mounting surface is the mounting surface for the main body to connect with the vehicle middle floor structural member. Since the assembly of the vehicle middle floor structural member and the main body needs to consider the dimensional accuracy during the assembly process, it is necessary to constrain the relative position between the vehicle middle floor structural member and the main body. Designing the middle floor mounting surface as two mutually perpendicular surfaces can greatly improve the assembly speed and assembly accuracy during the assembly process.

[0023] Optionally, the material for the integral die-casting of the main body is selected as AlSi10MnMg, and the basic wall thickness of the main body is greater than the average wall thickness.

[0024] By adopting the above technical solution, using AlSi10MnMg as the manufacturing material of the main body firstly meets the fluidity requirements of the die-casting material at the die-casting temperature, and at the same time meets the temperature requirements of the die-casting material in the liquid state. And this material has sufficient strength and toughness, enabling the main body to meet the mechanical property requirements while adopting a lightweight design. At the same time, after the optimization of the above technical solution for the main body, the wall thickness of some parts has been improved to a certain extent. Therefore, the basic wall thickness of the main body is greater than the average wall thickness.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Achieved the maximum degree of integration and lightweight, and integrated various installation areas such as the body longitudinal beam mounting surface, driver's side sill beam mounting surface, B-pillar mounting point, C-pillar mounting surface, slide rail mounting point, battery frame mounting point, middle floor mounting surface and side wall mounting surface in the preliminary design stage; 2. By selecting the moving die side and the fixed die side, the integrated production can be guaranteed to a certain extent in the production process; 3. By the cross-shaped reinforcing ribs on the moving die side and the cylindrical features of the battery frame mounting points, the stiffness of the main body on the moving die side is ensured; 4. By adding the gradually changing non-uniform reinforcing ribs on the fixed die side, the stiffness of the main body on the fixed die side is ensured; 5. The manufacturing material of the main body uses AlSi10MnMg to meet the overall fluidity requirements of the integral die-casting, ensures relative lightweight, and also has certain mechanical property guarantees. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main body of a lightweight high-pressure die-cast aluminum alloy sill plate.

[0027] Figure 2 It is a schematic diagram designed to highlight the body longitudinal beam mounting surface.

[0028] Figure 3 It is a schematic diagram designed to highlight the middle floor mounting surface.

[0029] Figure 4 It is a structural schematic diagram designed to highlight the side panel mounting surface.

[0030] Figure 5 It is a distribution schematic diagram designed to highlight the gradually changing non-uniformly spaced reinforcing ribs on the fixed mold side.

[0031] Figure 6 It is a distribution schematic diagram designed to highlight the cross-shaped reinforcing ribs on the moving mold side.

[0032] Figure 7 It is a partial structural schematic diagram designed to highlight the cross-shaped reinforcing ribs.

[0033] Explanation of reference numerals: 1a, main body; 1b, fixed mold side; 1c, moving mold side; 1, vehicle body longitudinal beam mounting surface; 2, driver's side sill beam mounting surface; 3, B-pillar mounting point; 4, C-pillar mounting surface; 5, slide rail mounting point; 6, battery frame mounting point; 7, middle floor mounting surface; 8, side panel mounting surface; 9, cross-shaped reinforcing rib; 10, gradually changing non-uniformly spaced reinforcing rib. Detailed implementation manners

[0034] The following further elaborates on the present application in conjunction with all the drawings.

[0035] The embodiment of the present application discloses a lightweight high-pressure die-cast aluminum alloy sill plate.

[0036] As Figures 1 to 4 shown, a lightweight high-pressure die-cast aluminum alloy sill plate includes a main body 1a, a moving mold side 1c and a fixed mold side 1b. The main body 1a is an integrally die-cast structural member. The moving mold side 1c is the contact surface of the main body 1a on the moving mold side of the die-casting machine during die-casting operations. The fixed mold side 1b is the contact surface of the main body 1a on the fixed mold side of the die-casting machine during die-casting operations. The main body 1a includes a vehicle body longitudinal beam mounting surface 1, a driver's side sill beam mounting surface 2, a B-pillar mounting point 3, a C-pillar mounting surface 4, a slide rail mounting point 5, a battery frame mounting point 6, a middle floor mounting surface 7 and a side panel mounting surface 8. The vehicle body longitudinal beam mounting surface 1 and the slide rail mounting point 5 are arranged on the fixed mold side 1b. The battery frame mounting point 6 and the side panel mounting surface 8 are arranged on the moving mold side 1c. The driver's side sill beam mounting surface 2 is arranged on one side of the main body 1a in its own width direction. The B-pillar mounting point 3 is arranged on one side in the width direction of the main body 1a and is adjacent to the driver's side sill beam mounting surface 2. The C-pillar mounting surface 4 is arranged on the other side in the width direction of the main body 1a. The middle floor mounting surface is arranged on the width side of the fixed mold side 1b close to the C-pillar mounting surface 4.

[0037] The main body 1a is integrally designed, integrating the longitudinal beam mounting surface 1 of the vehicle body, the driver's side sill beam mounting surface 2, the B-pillar mounting point 3, the C-pillar mounting surface 4, the slide rail mounting point 5, the battery frame mounting point 6, the middle floor mounting surface 7 and the side wall mounting surface 8. Its characteristic design takes the dimensions and performance of the automotive structural parts previously produced by stamping process as the design goal, and optimizes the structure of the main body 1a through topology optimization and finite element simulation. After multiple optimization iterations, a new product is formed.

[0038] As Figure 4 , Figure 6 and Figure 7 shown, on one side of the moving die side 1c of the main body 1a, a cross-shaped reinforcing rib 9 is provided. The rib ridge of the cross-shaped reinforcing rib 9 is a "C"-shaped rib. The battery frame mounting points 6 are evenly arranged along the length direction of the main body 1a. The wall thickness at the connection of the cross-shaped reinforcing rib 9 and the battery frame mounting point 6 is one-sixth thicker than the wall thickness of the main body 1a at the position of the moving die side 1c. The cross-shaped reinforcing rib 9 connects the battery frame mounting points 6. The cross-shaped reinforcing rib 9 is arranged on the moving die side 1c to ensure the rigidity of the battery frame mounting point 6 also arranged on the moving die side 1c. Since the battery frame mounting point 6 is a cylindrical feature and its height far exceeds the thickness of the main body 1a, in order to meet the overall stiffness requirement of the main body 1a, the stiffness of the main body 1a is strengthened by using the cross-shaped reinforcing rib 9 feature for the battery frame mounting.

[0039] As Figure 1 , Figure 2 and Figure 5 shown, on one side of the fixed die side 1b of the main body 1a, a gradually changing unequal pitch reinforcing rib is provided. During the process from one end close to the B-pillar mounting point 3 to the side close to the C-pillar mounting surface 4, the pitch of the gradually changing unequal pitch reinforcing rib gradually increases, and the law of pitch increase is determined through finite element analysis. The wall thickness of the gradually changing unequal pitch reinforcing rib is one-sixth thicker than the wall thickness of the main body 1a at the position of the fixed die side 1b. The slide rail mounting point 5 is arranged below the lowest point of the gradually changing unequal pitch reinforcing rib. The longitudinal beam mounting surface 1 of the vehicle body is provided with a demolding slope and a demolding crack.

[0040] As Figure 1 and Figure 5 shown, the fixed die side 1b of the main body 1a uses a gradually changing unequal pitch reinforcing rib to reinforce the stiffness of the guide rail mounting point and the longitudinal beam mounting surface 1 of the fixed die side 1b of the main body 1a. At the same time, the dynamic performance of the main body 1a is analyzed through finite element simulation, and the modal vibration mode of the main body 1a is optimized by adjusting the rib pitch of the gradually changing unequal pitch reinforcing rib. At the same time, since the position where the gradually changing unequal pitch reinforcing rib is connected to the main body 1a belongs to the position where the metal flow direction changes suddenly, and this position is prone to solidify first, cutting off the liquid metal feeding channel, therefore, this technical problem is solved by thickening the wall thickness of the gradually changing unequal pitch reinforcing rib.

[0041] As Figure 2 shown, the driver's side sill beam mounting surface 2 is connected to the outside through aluminum-aluminum welding and hot melt spin riveting. The driver's side sill beam mounting surface 2 is divided into two types of surface shapes and three-sided mounting surfaces. One type of surface shape is the riveting flange surface, and one type of surface shape is the aluminum-aluminum welding surface. There are two sides of the riveting flange surface and one side of the aluminum-aluminum welding surface. The aluminum-aluminum welding surface is parallel to the moving die side 1c surface, and the hot melt spin riveting flange surface forms an "L" shape, with one side parallel to the moving die side 1c.

[0042] The driver's side sill beam mounting surface 2 needs to be connected to the driver's side sill beam. Due to the arrangement of the main body 1a in the assembly process sequence, it is necessary to first connect the driver's side sill beam to the main body 1a and then enter the next process. Therefore, it is necessary to first weld the main body 1a to the driver's side sill beam on the vehicle assembly line using the welding process. Since the main body 1a is a die-cast part, its welding performance is relatively poor, and it cannot guarantee the performance of the welding position during actual operation. Therefore, it is necessary to use the hot melt spin riveting process to connect the main body 1a to the driver's side sill beam.

[0043] As Figure 2 shown, the B-pillar mounting point 3 is provided with through holes of two different diameters as reserved holes for the hot melt spin riveting process. The B-pillar mounting point 3 faces the moving die side 1c. The riveting surface of the hot melt spin riveting is perpendicular to the moving die side 1c and the gradually changing unequal distance reinforcing rib. Since the vehicle B-pillar is the upright column between the front and rear doors and is an important load-bearing structural component in the vehicle structure and one of the important structures for the vehicle to resist side impacts, the connection performance requirements of the vehicle B-pillar to the main body 1a are extremely high. The fact that the B-pillar mounting point 3 is provided with through holes of two different diameters as reserved holes for the hot melt spin riveting process is the conclusion obtained through multiple static and dynamic analysis calculations using finite element analysis. At the same time, the perpendicularity of the riveting surface of the hot melt spin riveting to the moving die side 1c and the gradually changing unequal distance reinforcing rib ensures the dimensional accuracy when the B-pillar is connected to the main body 1a.

[0044] As Figure 3 shown, the C-pillar mounting surface 4 is connected to the outside through self-piercing rivets. The riveting surface of the self-piercing rivet is perpendicular to the fixed die side 1b, and the riveting surface of the self-piercing rivet is parallel to the gradually changing unequal distance reinforcing rib. The C-pillar mounting surface 4 is the mounting surface for the main body 1a to connect to the vehicle C-pillar. The main body 1a is connected to the vehicle C-pillar through self-piercing rivets. Since the vehicle C-pillar is a load-bearing structural part in the vehicle rear door and tail area in the vehicle structure, while ensuring the installation quality of the window and canopy, it is also necessary to solve the collision performance problem in the vehicle rear door area. The purpose of "the riveting surface of the self-piercing rivet is parallel to the gradually changing unequal distance reinforcing rib" is to ensure the dimensional accuracy in the vehicle assembly process, thereby ensuring the collision performance in the vehicle rear door area.

[0045] As Figure 4As shown, the side wall mounting surface 8 is arranged along the length direction of the main body 1a. The side wall mounting surface 8 is characterized by a plate shape. The side wall mounting surface 8 is divided into a high surface and a low surface. The vertical lower end of the high surface is connected to the main body 1a. The high surface is horizontally connected to the cross-shaped reinforcing rib 9 on both sides. The side wall mounting surface 8 is perpendicular to the moving die side 1c. The low surface is arranged at the edge of the main body 1a. The bottom surface is horizontally connected to the cross-shaped reinforcing rib 9 on one side. The high surface is arranged between the battery frame mounting point 6 and the low surface. The cross-shaped reinforcing rib 9 surrounds the battery frame mounting point 6 and the side wall mounting surface 8.

[0046] The side wall mounting surface 8 is the mounting surface for the main body 1a to connect with the vehicle side wall structural member. The high surface and the bottom surface of the side wall mounting surface 8 are staggeredly arranged in the width direction of the main body 1a.

[0047] As Figure 3 shown, the middle floor mounting surface 7 is divided into two surfaces, the two surfaces are perpendicular to each other, and both surfaces are perpendicular to the moving die side 1c. The middle floor mounting surface is connected to the outside through hot melt spin riveting.

[0048] The middle floor mounting surface 7 is the mounting surface for the main body 1a to connect with the vehicle middle floor structural member. Since the assembly of the vehicle middle floor structural member and the main body 1a needs to consider the dimensional accuracy during the assembly process, it is necessary to constrain the relative position between the vehicle middle floor structural member and the main body 1a. Designing the middle floor mounting surface 7 as two mutually perpendicular surfaces can greatly improve the assembly speed and assembly accuracy during the assembly process.

[0049] The material selected for the integral die-casting of the main body 1a is AlSi10MnMg, and the basic wall thickness of the main body 1a is greater than the average wall thickness. Using AlSi10MnMg as the manufacturing material of the main body 1a can first meet the fluidity requirements of the die-casting material at the die-casting temperature, and at the same time meet the temperature requirements of the die-casting material in the liquid state. And this material has sufficient strength and toughness, so that the main body 1a can meet the mechanical property requirements while adopting a lightweight design. At the same time, after the optimization of the above technical solution for the main body 1a, the wall thickness of some parts has been improved to a certain extent. Therefore, the basic wall thickness of the main body 1a is greater than the average wall thickness.

[0050] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A lightweight high-pressure die-cast aluminum alloy threshold plate, comprising a main body, a movable die side and a fixed die side, wherein the main body is an integrated die-casting structural part, the movable die side is the contact surface of the main body on the movable die side of the die-casting machine during the die-casting operation, and the fixed die side is the contact surface of the main body on the fixed die side of the die-casting machine during the die-casting operation, characterized in that: The main body includes a body longitudinal beam mounting surface, a main driver's door sill beam mounting surface, a B-pillar mounting point, a C-pillar mounting surface, a slide rail mounting point, a battery frame mounting point, a middle floor mounting surface and a side panel mounting surface. The body longitudinal beam mounting surface and the slide rail mounting point are arranged on the fixed mold side, the battery frame mounting point and the side panel mounting surface are arranged on the movable mold side, the main driver's door sill beam mounting surface is arranged on one side of the body's own width direction, the B-pillar mounting point is arranged on one side of the body's width direction and is adjacent to the main driver's door sill beam mounting surface, the C-pillar mounting surface is arranged on the other side of the body's width direction, and the middle floor plate mounting surface is arranged on the fixed mold side close to the width side of the C-pillar mounting surface.

2. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 1, characterized in that: A cross-shaped reinforcement rib is arranged on one side of the movable mold side of the main body, and the ridge of the cross-shaped reinforcement rib is a "C"-shaped rib. The battery frame mounting points are evenly arranged along the length direction of the main body, and the wall thickness at the connection between the cross-shaped reinforcement rib and the battery frame mounting point is one-sixth thicker than the wall thickness of the main body at the movable mold side.

3. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 1, characterized in that: One surface of the fixed mold side of the main body is provided with gradually changing unequally spaced reinforcing ribs. In the process of the gradually changing unequally spaced reinforcing ribs moving from one end close to the B-pillar mounting point to one side close to the C-pillar mounting surface, the spacing of the gradually changing unequally spaced reinforcing ribs gradually increases, and the law of increasing spacing is determined by finite element analysis. The wall thickness of the gradually changing unequally spaced reinforcing ribs is one-sixth thicker than the wall thickness of the main body at the fixed mold side position. The slide rail mounting point is arranged below the low point of the gradually changing unequally spaced reinforcing ribs, and the vehicle body longitudinal beam mounting surface is provided with a demoulding slope and a demoulding crack.

4. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 1, characterized in that: The main driver's door sill beam mounting surface is connected to the outside world through aluminum-aluminum welding and hot-melt riveting. The main driver's door sill beam mounting surface is divided into two types of surface types and three-sided mounting surfaces, one of which is a riveted flange surface, and the other is an aluminum-aluminum welding surface. The riveted flange surfaces have two sides, and the aluminum-aluminum welding surfaces have one side. The aluminum-aluminum welding surface is parallel to the side of the movable mold. The two riveted flange surfaces form an "L" shape, and one of the two riveted flange surfaces is parallel to the movable mold side.

5. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 3, characterized in that: The B-pillar mounting point is provided with through holes with two apertures as reserved holes for the hot melt riveting process. The B-pillar mounting point faces the movable mold side, and the riveting surface of the hot melt riveting is perpendicular to the movable mold side and the gradually unequally spaced reinforcing ribs.

6. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 3, characterized in that: The C-pillar mounting surface is connected to the outside world through self-piercing rivets, the riveting surface of the self-piercing rivets is perpendicular to the fixed mold side, and the riveting surface of the self-piercing rivets is parallel to the gradually varying unequally spaced reinforcing ribs.

7. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 2, characterized in that: The side enclosure mounting surface is arranged along the length direction of the main body, and the side enclosure mounting surface is divided into a high surface and a low surface. The side enclosure mounting surface is perpendicular to the movable mold side and the low surface is arranged at the edge of the main body, the high surface is arranged between the battery frame mounting point and the low surface, and the M-shaped reinforcement ribs surround the battery frame mounting point and the side enclosure mounting surface.

8. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 1, characterized in that: The middle floor installation surface is divided into two surfaces, the two surfaces are perpendicular to each other, and the two surfaces are perpendicular to the movable mold side. The middle bottom plate installation surface is connected to the outside world by hot-melt riveting.

9. The lightweight high pressure die-cast aluminum alloy rocker plate according to claim 1, characterized in that: The material of the integrated die-casting of the main body is AlSi10MnMg, and the basic wall thickness of the main body is greater than the average wall thickness.

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