Preparation method of high-bearing-capacity light-weight suspension

Abstract

The preparation method comprises the following steps that raw materials are added into a smelting furnace to be melted to form a metal mixed solution, and the metal mixed solution comprises iron, silicon, manganese, chromium, sulfur, phosphorus, molybdenum, alum, titanium, copper, nickel, cerium, aluminum and a silicon carbide particle reinforced composite material; secondly, a mold cavity of a suspension casting mold is slowly filled with the metal mixed liquid; cooling water with the temperature of 18-22 DEG C is introduced into a mold core of the suspension casting mold, and the mold is cooled at the speed of 6-9 L / min; and a formed suspension casting is taken out of the suspension casting mold and immersed into water at the temperature of 30-45 DEG C to be rapidly cooled, and preparation of the bearing light-weight suspension is completed. According to the preparation method, the silicon carbide particle reinforced composite material is added into the metal mixed liquid, so that the strength, wear resistance and fatigue resistance of the metal liquid are improved, meanwhile, the advantage of light weight is kept, the light weight requirement of the automotive suspension can be met, and the purpose of high bearing capacity can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile suspension preparation, in particular to a preparation method of a high-load lightweight suspension. BACKGROUND

[0002] Suspension is the general term for all force transmission connecting devices between the frame (or load-bearing body) and the axle (or wheel) of the automobile, which functions to transmit the force and torque between the wheel and the frame, and to buffer the impact force from the uneven road to the frame or body, and to reduce the vibration caused thereby, so as to ensure smooth driving of the automobile.

[0003] Nowadays, the automobile industry is developing rapidly, the requirements for energy saving and emission reduction are increasing, and the research on lightweight automobiles is getting more and more attention; heavy truck suspension is an important system of heavy truck chassis, and automobile suspension is facing a new round of large-scale technical upgrading; air suspension, rubber suspension, and few-leaf spring lightweight products are widely used in the fields of passenger cars and heavy trucks; from the perspective of overall vehicle technology development, suspension technology is directly related to the safety, control, comfort, lightweight, and other performances of the vehicle, and is an important part of the overall vehicle quality; steel plate spring balance suspension is widely used due to its low cost, simple structure, and easy maintenance.

[0004] At present, the existing automobile suspension generally selects steel-aluminum alloy, which has a relatively large density and can cause heavy steering of the automobile and serious wear of the tire. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a preparation method of a high-load lightweight suspension, so that the prepared suspension can meet the requirements of lightweight and achieve the purpose of high load.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows: a preparation method of a high-load lightweight suspension, the innovation point of which is that the method comprises the following steps: S1: first, the raw materials required for preparing the suspension are added to a smelting furnace for melting to form a required metal mixed solution, the metal mixed solution comprising iron, silicon, manganese, chromium, sulfur, phosphorus, molybdenum, alum, titanium, copper, nickel, cerium, aluminum, and silicon carbide particle reinforced composite material; S2: secondly, the metal mixed solution is slowly filled into the mold cavity of the suspension casting mold to complete the filling; S3: then, after the filling is completed, cooling water at 18-22℃ is introduced into the core of the suspension casting mold to cool the mold at a speed of 6-9L per minute; S4: finally, the molded suspension casting is taken out of the suspension casting mold and immersed in water at 30-45℃ for rapid cooling to complete the preparation of the load-bearing lightweight suspension.

[0007] Furthermore, in step S1, the mass ratio of silicon is 0.5-1.5%, the mass ratio of manganese is 0.5-1.0%, the mass ratio of chromium is 0.5-1.5%, the mass ratio of sulfur is 0.02-0.05%, the mass ratio of phosphorus is 0.01-0.03%, the mass ratio of molybdenum is 0.2-0.5%, the mass ratio of vanadium is 0.1-0.3%, the mass ratio of titanium is 0.1-0.3%, the mass ratio of copper is 0.1-0.5%, the mass ratio of nickel is 0.5-1.0%, the mass ratio of cerium is 0.05-0.15%, the mass ratio of aluminum is 0.1-0.5%, the mass ratio of silicon carbide particle-reinforced composite material is 2-4%, and the remainder is iron.

[0008] Furthermore, the silicon carbide particle-reinforced composite material is made by mixing 6% silicon carbide particles, 7% graphite particles, and 87% aluminum alloy matrix.

[0009] Furthermore, in step S1, during the melting process, iron, silicon, manganese, chromium, sulfur, phosphorus, molybdenum, vanadium, titanium, copper, nickel, cerium, and aluminum are first melted to form a molten metal. Then, silicon carbide particle-reinforced composite material is added to the molten metal and stirred evenly to form the desired metal mixture.

[0010] Furthermore, in step S2, before slowly adding the metal mixture into the suspension casting mold, the metal mixture needs to be heat-treated. First, the metal mixture is heated to 980-1250℃ and held at that temperature for 1-1.5 hours. Then, the heated metal mixture is held at 150-200℃ for 1-3 hours. Finally, it is tempered at 150-650℃ for 90-150 minutes to complete the heat treatment.

[0011] Furthermore, in step S2, before adding the metal mixture to the suspension casting mold, the suspension casting mold needs to be preheated to a temperature of 300-350°C.

[0012] The advantages of this invention are as follows: the preparation method of this invention improves the strength, wear resistance and fatigue resistance of the metal liquid by adding silicon carbide particles to the metal mixture, while maintaining the advantage of lightweight, which can meet the lightweight requirements of automobile suspension and achieve the purpose of high load-bearing capacity.

[0013] The added silicon carbide particle-reinforced composite material is made by mixing 6% silicon carbide particles, 7% graphite particles and 87% aluminum alloy matrix. Through the synergistic effect of silicon carbide particles and graphite particles, and their effective combination with aluminum alloy matrix, the hardness and yield strength can be significantly improved, and the weight can be effectively reduced while ensuring strength.

[0014] By heat-treating the metal mixture and controlling the temperature and time of each process, the internal structure of the metal is altered during the heat treatment, providing a good foundation for subsequently improving the strength, toughness, and fatigue resistance of the suspension.

[0015] Preheating the mold shortens the molding time, allowing the mold to reach a uniform temperature field in a short time, thus improving casting production efficiency, saving molten metal for trial molding, and reducing the generation of scrap. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with preferred embodiments, is provided below.

[0017] The method for manufacturing the high-load-bearing lightweight suspension of the present invention is achieved through the following steps: S1: First, the raw materials required for preparing the suspension are added to a melting furnace and melted to form the required metal mixture, which includes iron, silicon, manganese, chromium, sulfur, phosphorus, molybdenum, vanadium, titanium, copper, nickel, cerium, aluminum and silicon carbide particle reinforced composite material.

[0018] In the aforementioned metal mixture, the mass ratio of silicon is 0.5-1.5%, manganese is 0.5-1.0%, chromium is 0.5-1.5%, sulfur is 0.02-0.05%, phosphorus is 0.01-0.03%, molybdenum is 0.2-0.5%, vanadium is 0.1-0.3%, titanium is 0.1-0.3%, copper is 0.1-0.5%, nickel is 0.5-1.0%, cerium is 0.05-0.15%, aluminum is 0.1-0.5%, silicon carbide particle-reinforced composite material is 2-4%, and the remainder is iron.

[0019] The silicon carbide particle-reinforced composite material in this embodiment is made by mixing 6% silicon carbide particles, 7% graphite particles, and 87% aluminum alloy matrix. The added silicon carbide particle-reinforced composite material, made by mixing 6% silicon carbide particles, 7% graphite particles, and 87% aluminum alloy matrix, achieves a significant increase in hardness and yield strength through the synergistic effect of the silicon carbide and graphite particles and their effective bonding with the aluminum alloy matrix. This also ensures strength while effectively reducing weight.

[0020] During the melting process, iron, silicon, manganese, chromium, sulfur, phosphorus, molybdenum, vanadium, titanium, copper, nickel, cerium, and aluminum are first melted to form a molten metal. Then, silicon carbide particle-reinforced composite material is added to the molten metal and stirred evenly to form the desired metal mixture.

[0021] S2: Next, the metal mixture is slowly filled into the mold cavity of the suspension casting mold to complete the filling process.

[0022] Before slowly adding the molten metal mixture into the suspension casting mold, the molten metal mixture needs to undergo heat treatment. First, the molten metal mixture is heated to 980-1250℃ to allow metals such as silicon, manganese, chromium, sulfur, phosphorus, molybdenum, vanadium, titanium, copper, nickel, cerium, and aluminum to fully dissolve in the iron matrix. This temperature is maintained for 1-1.5 hours to form a supersaturated solid solution. Then, the heated molten metal mixture is held at 150-200℃ for 1-3 hours to allow fine second-phase particles to precipitate in the supersaturated solid solution, thus hindering dislocation movement and improving the strength and hardness of the molten metal mixture while maintaining good toughness. Finally, it is tempered at 150-650℃ for 90-150 minutes to eliminate internal stress, stabilize the microstructure, and further adjust the balance between the strength and toughness of the molten metal mixture, avoiding brittleness and ensuring the reliability of the prepared suspension under complex loads. This completes the heat treatment process.

[0023] Before adding the molten metal mixture to the suspension casting mold, the mold needs to be preheated to 300-350℃. Preheating the mold shortens the molding time, allowing the mold to reach a uniform temperature field in a short time, improving casting production efficiency, saving molten metal for trial molding, and reducing the generation of scrap.

[0024] S3: Then, after the filling is completed, cooling water at 18-22°C is introduced into the core of the suspension casting mold to cool the mold at a rate of 6-9L per minute. S4: Finally, the formed suspension casting is removed from the suspension casting mold and immersed in water at 30-45℃ for rapid cooling, completing the preparation of the load-bearing lightweight suspension.

[0025] The preparation method of the present invention improves the strength, wear resistance and fatigue resistance of the metal liquid by adding silicon carbide particle-reinforced composite material to the metal mixture, while maintaining the advantage of lightweight, which can meet the lightweight requirements of automobile suspension and achieve the purpose of high load-bearing capacity.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method of manufacturing a high load carrying lightweight suspension, characterized by: The method comprises the following steps: S1: first, raw materials required for preparing the suspension are added into a smelting furnace for melting to form a required metal mixture, which comprises iron, silicon, manganese, chromium, sulfur, phosphorus, molybdenum, alum, titanium, copper, nickel, cerium, aluminum and silicon carbide particle reinforced composite material; S2: secondly, the metal mixture is slowly filled into a mold cavity of a suspension casting mold to complete the filling; S3: then, after the filling is completed, cooling water at 18-22 ℃ is introduced into the core of the suspension casting mold to cool the mold at a speed of 6-9 L per minute; S4: finally, the shaped suspension casting is taken out of the suspension casting mold and immersed in water at 30-45 ℃ for rapid cooling to complete the preparation of the lightweight suspension.

2. The method of manufacturing a high load lightweight suspension of claim 1, wherein: In the step S1, the mass ratio of silicon is 0.5-1.5%, the mass ratio of manganese is 0.5-1.0%, the mass ratio of chromium is 0.5-1.5%, the mass ratio of sulfur is 0.02-0.05%, the mass ratio of phosphorus is 0.01-0.03%, the mass ratio of molybdenum is 0.2-0.5%, the mass ratio of alum is 0.1-0.3%, the mass ratio of titanium is 0.1-0.3%, the mass ratio of copper is 0.1-0.5%, the mass ratio of nickel is 0.5-1.0%, the mass ratio of cerium is 0.05-0.15%, the mass ratio of aluminum is 0.1-0.5%, and the mass ratio of the silicon carbide particle reinforced composite material is 2-4%, and the rest is iron.

3. The method of claim 1, wherein: The silicon carbide particle reinforced composite material is made by mixing 6% of silicon carbide particles, 7% of graphite particles and 87% of an aluminum alloy matrix.

4. The method of claim 1, wherein: In the step S1, when melting, the iron, silicon, manganese, chromium, sulfur, phosphorus, molybdenum, alum, titanium, copper, nickel, cerium and aluminum are first melted to form a metal liquid, and then the silicon carbide particle reinforced composite material is added into the metal liquid for stirring and uniformity to form the required metal mixture.

5. The method of manufacturing a high load lightweight suspension of claim 1, wherein: In the step S2, before the metal mixture is slowly added into the suspension casting mold, the metal mixture needs to be heat treated, first, the metal mixture is heated to 980-1250 ℃ and kept for 1-1.5 hours, then the heated metal mixture is kept at a temperature of 150-200 ℃ for 1-3 hours, and finally, the metal mixture is tempered at 150-650 ℃ for 90-150 min to complete the heat treatment.

6. The method of manufacturing a high load lightweight suspension of claim 1, wherein: In the step S2, before the metal mixture is added into the suspension casting mold, the suspension casting mold needs to be preheated, and the preheating temperature is 300-350 ℃.