Production process of high-strength 6005 alloy automobile part valve body

Abstract

The invention relates to an alloy production process, in particular to a high-strength 6005 alloy automobile part valve body production process which specifically comprises the following steps: (S1) proportioning raw materials; (S2) smelting; (S3) casting; (S4) homogenizing annealing; (S5) extruding; (S6) aging treatment; and (S7) cooling to room temperature. According to the production process for the high-strength 6005 alloy automobile part valve body, the strength of an automobile part (valve body) can be guaranteed.

Description

Technical Field

[0001] The invention relates to an alloy production process, in particular to a high-strength 6005 alloy automobile component valve body production process. Background Art

[0002] With the rapid development of the new energy vehicle industry, consumers have higher and higher requirements for the safety of automobiles. Anti-lock braking system (ABS) is widely used in automobile manufacturing as a safety braking system. ABS has the functions of anti-lock and anti-skid. It adjusts the braking conditions of the car through electronic sensors and oil pressure control, effectively improving the safety of the car. Due to the particularity of its working environment (oil pressure control) and the importance of its function (safety system), strict requirements are placed on the organization and performance of the materials of the main structural components of the ABS system.

[0003] 6005 is a widely used Al-Mg alloy. Its composition and content (mass percentage) mainly include: zinc (Zn) ≤ 0.25, chromium (Cr) ≤ 0.10, silicon (Si) ≤ 0.2, iron (Fe) 0.000 ~ 0.350, manganese (Mn) 0.2 ~ 0.5, magnesium (Mg) 0.4 ~ 0.50, titanium (Ti) ≤ 0.10, copper (Cu) ≤ 0.15, and the rest is aluminum (Al); its mechanical properties are: tensile strength σb (MPa): ≥ 175, conditional yield strength σ0.2 (MPa): ≥ 80, elongation δ5 (%): ≥ 15.

[0004] The Chinese patent application with publication number CN118406939A discloses a high-strength 6005 aluminum alloy material and a preparation method thereof. In the patent, the type and content of elements in the aluminum alloy are adjusted to improve the strength of the 6005 aluminum alloy. According to the records in the patent, the tensile strength of the 6005 aluminum alloy material is 293MPa, the yield strength is 273Mpa, and the elongation is 11.5%. It can be seen that the mechanical properties of the 6005 aluminum alloy can be greatly improved by adjusting the type and content of each element in the alloy. However, adding rare earth elements to achieve this goal will greatly increase the production cost of the product, making the product lose its market competitiveness.

[0005] In order to meet the requirements of the main structural components of the ABS system while ensuring the production cost, it is necessary to improve the preparation process of the main structural material (6005 alloy aluminum) of the ABS system to improve its mechanical properties. Summary of the invention

[0006] In order to overcome the deficiencies in the prior art, the present invention provides a high-strength 6005 alloy automobile component valve body production process to ensure the strength of the alloy.

[0007] To achieve the above object, the present invention discloses a production process for a high-strength 6005 alloy automobile component valve body, comprising the following steps:

[0008] (S1) Raw material ratio: silicon Si mass fraction of 0.8-0.9%, iron Fe mass fraction of 0.2-0.3%, copper Cu mass fraction of 0.1%, manganese Mn mass fraction of 0.05%, magnesium Mg mass fraction of 0.5-0.6%, chromium Cr mass fraction of 0.1%, titanium Ti mass fraction of 0.1%, the content of all impurities is not more than 0.15%, the content of a single impurity is not more than 0.05%, and the rest is Al aluminum element;

[0009] (S2) Melting: The first melting is carried out in a melting furnace at a temperature of 740-760°C; the second melting is carried out in a holding furnace at a temperature of 750-760°C; during the first and second melting processes, slag removal is maintained to ensure the purity of the melt before casting;

[0010] (S3) Casting: hot top mold casting, casting speed is 40-43 mm / min, casting water volume is 3000-3300 l / min;

[0011] (S4) homogenization annealing: first, keep the temperature at 540°C for 2 h, then increase the temperature to 575°C and keep the temperature for 6 h;

[0012] (S5) Extrusion: ensure that the temperature of the extrusion barrel is 420-460°C; control the heating temperature of the extrusion die to be 460-500°C, and the die heating temperature does not exceed 24h; use a low-frequency induction heating furnace to heat the aluminum rod at a temperature of 490-530°C; the pressurization speed is 6-10m / min; the product outlet temperature of the extruded aluminum material is 530-550°C; use online water tank quenching; stretch straightening deformation is 0.8%-1.2%;

[0013] (S6) Aging: A peak aging process is used, the peak aging temperature is 175-185°C, and the aging holding time is 10h;

[0014] (S7) After aging treatment, naturally cool to room temperature.

[0015] Preferably, the silicon element Si is added in the form of an AlSi alloy, the iron element Fe is added in the form of an AlFe alloy, Mg is added in the form of a simple Mg ingot, and the titanium element Ti is added in the form of an AlTi alloy.

[0016] Preferably, degassing is performed online during the casting process, the degasser rotor speed is not less than 500r / min, and 30ppi and 40ppi dual filter plates are used for filtration.

[0017] Preferably, after the profile is extruded and formed, it is sawed and cut to the required size and framed. When framing, the profiles are spaced 10 to 20 mm apart and are separated by padding blocks.

[0018] The present invention has the following technical effects:

[0019] 1. The mechanical properties of the existing 6005 aluminum alloy are improved by adjusting the element types and contents. After testing, the alloy prepared by this process has a tensile strength of more than 300Mpa, a yield strength of more than 280Mpa, an elongation of more than 14%, a Brinell hardness of more than 100HBW, and a grain size of more than 4 levels. Compared with the existing 6005Al-Mg alloy, the tensile strength is nearly doubled and the yield strength is more than three times higher, which can meet the performance requirements of valve body manufacturing.

[0020] 2. This process adopts homogenization annealing, which can ensure the dispersion and precipitation of Mg2Si strengthening phase, promote the transformation of β-AlFeSi phase into α-AlFeSi phase, and ensure the uniform composition and organization of aluminum rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The metallographic diagram of the product obtained in Example 2;

[0023] Figure 2 The deformation strain curve of the product obtained in Example 2. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with embodiments; the examples given are only used to explain the present invention; they are not used to limit the scope of the present invention.

[0025] A high-strength 6005 alloy automobile component valve body production process comprises the following steps:

[0026] (S1) Raw material ratio: silicon element Si mass fraction is 0.8-0.9%, iron element Fe mass fraction is 0.2-0.3%, copper element Cu mass fraction is 0.1%, manganese element Mn mass fraction is 0.05%, magnesium element Mg mass fraction is 0.5-0.6%, chromium element Cr mass fraction is 0.1%, titanium element Ti mass fraction is 0.1%, the content of all impurities is not more than 0.15%, the content of single impurity is not more than 0.05%, and the rest is Al aluminum element; silicon element Si is added in the form of AlSi alloy, iron element Fe is added in the form of AlFe alloy, Mg is added in the form of Mg ingot, and titanium element Ti is added in the form of AlTi alloy. According to the above requirements, the content of each element in Examples 1-3 is as follows. The impurities here may be Ni, Ag, B, Bi, Ga, Li, Pb, Sn, V, Zr. The source of impurities is that the raw materials cannot be guaranteed to be 100% pure, and there will always be impurity elements.

[0027] Table 1 Element content of each example (%)

[0028] Si element Fe element Cu Mn element Mg Cr element Ti element Impurities Al element Example 1 0.8 0.2 0.1 0.05 0.5 0.1 0.1 0.05 1.9 Example 2 0.87 0.24 0.1 0.05 0.52 0.1 0.1 0.07 2.05 Example 3 0.9 0.3 0.1 0.05 0.6 0.1 0.1 0.15 2.3

[0029] (S2) Melting: The first melting is carried out in a melting furnace at a temperature of 740-760°C; the second melting is carried out in a holding furnace at a temperature of 750-760°C; during the first and second melting processes, slag removal is maintained to ensure the purity of the melt before casting.

[0030] (S3) Casting: Hot top mold casting is adopted, the casting speed is 40-43 mm / min, and the casting water volume is 3000-3300 l / min; online degassing is carried out during the casting process, the degasser rotor is not less than 500 r / min, and 30 ppi and 40 ppi double machine filter plates are used for filtration.

[0031] (S4) Homogenization annealing: first, keep the temperature at 540°C for 2 hours, then increase the temperature to 575°C and keep the temperature for 6 hours.

[0032] (S5) Extrusion: Ensure that the extrusion barrel temperature is 420-460℃; control the extrusion die heating temperature at 460-500℃, and the die heating temperature does not exceed 24h; use a low-frequency induction heating furnace to heat the aluminum rod at a temperature of 490-530℃; the pressurization speed is 6-10m / min; the product outlet temperature of the extruded aluminum is 530-550℃; use online water tank quenching; stretch straightening deformation of 0.8%-1.2%. After the profile is extruded, it is cut to the required size and framed. When framing, the profiles are spaced 10-20mm apart, and the profiles are separated by padding blocks.

[0033] (S6) Aging: A peak aging process is adopted, the peak aging temperature is 175-185°C, and the aging holding time is 10h.

[0034] (S7) After aging treatment, naturally cool to room temperature.

[0035] After the preparation is completed, in order to test the products prepared in each embodiment, taking Example 2 as an example, the performance of the product is tested according to the national standard GB / T228.1-2010 metal material tensile test room temperature test method. The relevant test parameters and results are shown in Table 2 below. The structural organization is as follows Figure 1 shown.

[0036] Table 2 Sample test results

[0037] name area Break gauge length Tensile Strength Yield Strength parameter Full area computing 0.2％ unit mm mm <![CDATA[N / mm 2 ]]> <![CDATA[N / mm 2 ]]> NBL001-24Q-1138 29.13 34.4 313 290 name Elongation after break Maximum force Yield parameter Full area computing 0.2％ unit ％ kN kN NBL001-24Q-1138 14.67 9.11 8.45

[0038] The stress-strain diagram is shown in the attached Figure 2 As shown, the properties of the final product are as follows: its tensile strength>300Mpa, yield strength>280Mpa, elongation>14%, Brinell hardness>100HBW, and grain size>4 levels.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength 6005 alloy automobile parts valve body production process, characterized in that: The following steps are involved: (S1) Raw material ratio: silicon Si mass fraction of 0.8-0.9%, iron Fe mass fraction of 0.2-0.3%, copper Cu mass fraction of 0.1%, manganese Mn mass fraction of 0.05%, magnesium Mg mass fraction of 0.5-0.6%, chromium Cr mass fraction of 0.1%, titanium Ti mass fraction of 0.1%, the content of all impurities is not more than 0.15%, the content of a single impurity is not more than 0.05%, and the rest is Al aluminum element; (S2) Melting: The first melting is carried out in a melting furnace at a temperature of 740-760°C; the second melting is carried out in a holding furnace at a temperature of 750-760°C; during the first and second melting processes, slag removal is maintained to ensure the purity of the melt before casting; (S3) Casting: hot top mold casting, casting speed is 40-43 mm / min, casting water volume is 3000-3300 l / min; (S4) homogenization annealing: first, keep the temperature at 540°C for 2 h, then increase the temperature to 575°C and keep the temperature for 6 h; (S5) Extrusion: ensure that the temperature of the extrusion barrel is 420-460°C; control the heating temperature of the extrusion die to be 460-500°C, and the die heating temperature does not exceed 24h; use a low-frequency induction heating furnace to heat the aluminum rod at a temperature of 490-530°C; the pressurization speed is 6-10m / min; the product outlet temperature of the extruded aluminum material is 530-550°C; use online water tank quenching; stretch straightening deformation is 0.8%-1.2%; (S6) Aging: A peak aging process is used, the peak aging temperature is 175-185°C, and the aging holding time is 10h; (S7) After aging treatment, naturally cool to room temperature.

2. The high-strength 6005 alloy automobile parts valve body production process according to claim 1 is characterized in that: Silicon element Si is added in the form of AlSi alloy, iron element Fe is added in the form of AlFe alloy, Mg is added in the form of Mg ingot, and titanium element Ti is added in the form of AlTi alloy.

3. The high-strength 6005 alloy automobile parts valve body production process according to claim 1 is characterized in that: During the casting process, degassing is carried out online, the degasser rotor speed is not less than 500r / min, and 30ppi and 40ppi double filter plates are used for filtration.

4. The high-strength 6005 alloy automobile component valve body production process according to claim 1 is characterized in that: After the profile is extruded, it is cut to the required size and framed. When framing, the profiles are spaced 10 to 20 mm apart and separated by padding blocks.

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