A high-stability and environmentally friendly forging lubricant for aluminum alloy wheels and preparation method thereof

Abstract

The present invention relates to the technical field of forging lubricants, and discloses a high-stable and environmentally friendly forging lubricant for aluminum alloy wheels. The present invention also discloses a preparation method of the above-mentioned high-stable and environmentally friendly forging lubricant for aluminum alloy wheels, including: mixing and grinding gallium oxide, cerium oxide, and calcium fluoride uniformly, heating to 600-800°C under nitrogen protection, keeping warm for 10-30min, heating to 1000-1100°C, passing a mixed gas of argon and oxygen, keeping warm for 1-2h, cooling to room temperature with the furnace to obtain a doped nano material; mixing white oil and paraffin oil uniformly, adding an emulsifier thereto and mixing uniformly, adding an oiliness agent, a doped nano material, and nano graphene and stirring to obtain a premix; adding an antioxidant, sodium fluoride, aluminum naphthenate, and a dispersant to water and stirring uniformly, adding the premix thereto under stirring, ultrasonically dispersing, and homogenizing at 40-45MPa high pressure for 10-30s.

Description

Technical Field

[0001] The invention relates to the technical field of forging lubricants, and in particular to a high-stability and environmentally friendly forging lubricant for aluminum alloy wheels and a preparation method thereof. Background Art

[0002] Aluminum alloy materials have the advantages of high specific strength, good thermal conductivity and electrical conductivity, strong reflectivity, good plasticity, good formability, and no low-temperature brittleness. They are widely used in modern automobile industry, aerospace industry, electronic communications industry, computer industry and other fields, especially in the field of aluminum alloy wheels.

[0003] Aluminum alloy wheel forging is a precision plastic forming technology with incomparable advantages over cutting. Cold forging technology is used to process aluminum alloy materials, which requires high performance of aluminum alloy wheel molds. Due to the characteristics of metal fluids and high bearing pressure, appropriate lubricants must be used to ensure the integrity of forgings and extend the service life of molds and equipment.

[0004] In the lubrication process of aluminum alloy wheel forging, lubricant is applied before processing and then forming. Lubricant has a great influence on the appearance and quality of the product, and lubricant is also required to help forging demolding. If the lubrication effect is poor, the friction surface of the aluminum alloy wheel is easily damaged during the forging process, which not only reduces the forging efficiency, but also deteriorates the mechanical properties of the aluminum alloy wheel, which needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a high-stability and environmentally friendly forging lubricant for aluminum alloy wheels and a preparation method thereof.

[0006] A high-stability and environmentally friendly forging lubricant for aluminum alloy wheels. The raw materials thereof include, by mass, 10-20 parts of white oil, 5-15 parts of paraffin oil, 1-2 parts of gallium oxide, 0.1-1 parts of cerium oxide, 2-5 parts of calcium fluoride, 2-4 parts of emulsifier, 1-5 parts of oiliness agent, 1-2 parts of nanographene, 0.1-1 parts of antioxidant, 0.001-0.1 parts of sodium fluoride, 1-2 parts of aluminum cyclohexaneate and 1-3 parts of dispersant.

[0007] Preferably, the viscosity of white oil at 40°C is 30.4-30.6 mm 2 / s.

[0008] Preferably, the paraffin oil is Karamay KP6030, whose viscosity at 40°C is 26.45-27.21 mm 2 / s.

[0009] Preferably, the emulsifier is polyoxyethylene sorbitan fatty acid ester and / or sorbitan fatty acid ester.

[0010] Preferably, the mass ratio of polyoxyethylene sorbitan fatty acid ester to sorbitan fatty acid ester is 1-2:1-2.

[0011] Preferably, the oiliness agent comprises: oleic acid and triethanolamine; the mass ratio of oleic acid to triethanolamine is 2-4:1.

[0012] Preferably, the antioxidant is 2,6-di-tert-butyl-p-cresol.

[0013] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0014] S1. Mix gallium oxide, cerium oxide and calcium fluoride and grind them evenly. Heat them to 600-800°C under nitrogen protection, keep them warm for 10-30 minutes, heat them to 1000-1100°C, introduce a mixed gas of argon and oxygen, keep them warm for 1-2 hours, and cool them to room temperature with the furnace to obtain doped nanomaterials with a particle size of 20-60 nm.

[0015] S2, white oil and paraffin oil are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 1-2h to obtain a premix;

[0016] S3. Stir the antioxidant, sodium fluoride, aluminum cyclohexaneate and dispersant for 10-30 minutes, add them into water and stir evenly, add the premix under stirring, ultrasonically disperse for 1-2 hours, and homogenize at 40-45 MPa high pressure for 10-30 seconds.

[0017] Preferably, in S1, the volume ratio of argon to oxygen is 5-10:1.

[0018] Preferably, in S1, during the process of heating to 600-800°C under nitrogen protection, the heating rate is 5-10°C / min.

[0019] Preferably, in S3, the ultrasonic frequency is 20-30 kHz. Beneficial Effects

[0020] The forging lubricant for the aluminum alloy wheel obtained by the present invention not only has good stability, high extreme pressure resistance, excellent lubrication performance, stable chemical properties and high safety, but also can make the pressure distribution uniform, promote the uniform flow of metal, and is not prone to adhesion, thereby improving the mechanical properties of the forged wheel hub.

[0021] The present invention uses gallium oxide and cerium oxide to mix and grind with calcium fluoride, and calcined in a tubular furnace, so that the obtained rare earth doped nanomaterial not only has small particles, but also has good lubricity and abradability. It can be matched with nanographene to reduce the friction coefficient and wear spot diameter under high load, and improve the extreme pressure resistance and service life of the lubricant. The applicant has verified through experiments that the present invention not only has strong extreme pressure resistance, but also can reduce friction surface damage, form a dense lubricating protective film, and greatly improve the service life.

[0022] The method of the invention is simple and has good suspension performance. It not only has excellent lubrication performance, but also greatly improves the adhesion performance with aluminum alloy, has good lubrication durability, improves forging efficiency, has excellent metal protection effect, and has excellent wheel mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a comparison chart of the maximum non-seizure load and sintering load of the forging lubricants obtained in Example 5 and Comparative Examples 1-2.

[0024] Figure 2 This is a comparison chart of the average friction coefficient and wear spot diameter of the forging lubricants obtained in Example 5 and Comparative Examples 1-2 under high load (784N).

[0025] Figure 3 The figure is a comparison of the mechanical properties of the aluminum alloy wheel blanks forged using the forging lubricants obtained in Example 5 and Comparative Examples 1-2. DETAILED DESCRIPTION

[0026] The present invention will be further explained below in conjunction with specific embodiments.

[0027] Example 1, a high stability and environmentally friendly forging lubricant for aluminum alloy wheels, the raw materials of which include: a viscosity of 30.4 mm at 40°C; 2 / s 32# white oil 10kg, 40℃ viscosity is 26.45mm 2 / s Karamay KP6030 5kg, gallium oxide 1kg, cerium oxide 0.1kg, calcium fluoride 2kg, emulsifier 2kg, oiliness agent 1kg, nanographene 1kg, 2,6-di-tert-butyl-p-cresol 0.1kg, sodium fluoride 0.001kg, aluminum cyclohexaneate 1kg, polyethylene glycol 400 1kg.

[0028] The emulsifier is obtained by mixing Span 80 and Tween 80 in a mass ratio of 2:1. The oiliness agent is obtained by mixing oleic acid and triethanolamine in a mass ratio of 2:1.

[0029] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0030] S1. Gallium oxide, cerium oxide and calcium fluoride are mixed and ground evenly, and then put into a tube furnace. Under nitrogen protection, the temperature is raised to 600°C at a rate of 5°C / min, and the temperature is kept for 10 minutes. The temperature is raised to 1000°C, and a mixed gas of argon and oxygen (the volume ratio of argon and oxygen is 5:1) is introduced. The temperature is kept for 1 hour, and the mixture is cooled to room temperature with the furnace to obtain a doped nanomaterial with a particle size of 20-60nm;

[0031] S2, No. 32 white oil and Karamay KP6030 are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 1 hour to obtain a premix;

[0032] S3. Stir 2,6-di-tert-butyl-p-cresol, sodium fluoride, aluminum cyclohexane and polyethylene glycol 400 for 10 minutes, add them into 50 kg of water and stir evenly, add the premix under stirring, and disperse by ultrasound for 1 hour at an ultrasonic frequency of 20 kHz. Use 40 MPa high pressure homogenization for 10 seconds.

[0033] Example 2, a high stability and environmentally friendly forging lubricant for aluminum alloy wheels, the raw materials of which include: a viscosity of 30.6 mm at 40°C; 2 / s 32# white oil 20kg, 40℃ viscosity is 27.21mm 2 / s Karamay KP6030 15kg, gallium oxide 2kg, cerium oxide 1kg, calcium fluoride 5kg, emulsifier 4kg, oiliness agent 5kg, nano-graphene 2kg, 2,6-di-tert-butyl-p-cresol 1kg, sodium fluoride 0.1kg, aluminum cyclohexaneate 2kg, polyethylene glycol 400 3kg.

[0034] The emulsifier is obtained by mixing Span 80 and Tween 80 in a mass ratio of 1:2. The oiliness agent is obtained by mixing oleic acid and triethanolamine in a mass ratio of 4:1.

[0035] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0036] S1. Mix gallium oxide, cerium oxide and calcium fluoride and grind them evenly, put them into a tube furnace, heat them to 800°C at a rate of 10°C / min under nitrogen protection, keep them warm for 30 minutes, heat them to 1100°C, introduce a mixed gas of argon and oxygen (the volume ratio of argon and oxygen is 10:1), keep them warm for 2 hours, cool them to room temperature with the furnace, and obtain doped nanomaterials with a particle size of 20-60nm;

[0037] S2, No. 32 white oil and Karamay KP6030 are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 2 hours to obtain a premix;

[0038] S3. Stir 2,6-di-tert-butyl-p-cresol, sodium fluoride, aluminum cyclohexane and polyethylene glycol 400 for 30 minutes, add them into 80 kg of water and stir evenly, add the premix under stirring, and disperse by ultrasound for 2 hours at an ultrasonic frequency of 30 kHz. Use 45 MPa high pressure homogenization for 30 seconds.

[0039] Example 3, a high stability and environmentally friendly forging lubricant for aluminum alloy wheels, the raw materials of which include: a viscosity of 30.5 mm at 40°C; 2 / s 32# white oil 12kg, 40℃ viscosity is 27.03mm 2 / s Karamay KP6030 8kg, gallium oxide 1.7kg, cerium oxide 0.3kg, calcium fluoride 4kg, emulsifier 2.5kg, oiliness agent 4kg, nano-graphene 1.3kg, 2,6-di-tert-butyl-p-cresol 0.7kg, sodium fluoride 0.005kg, aluminum cyclohexaneate 1.7kg, polyethylene glycol 400 1.5kg.

[0040] The emulsifier is obtained by mixing Span 80 and Tween 80 at a mass ratio of 1.7:1.2. The oiliness agent is obtained by mixing oleic acid and triethanolamine at a mass ratio of 3.5:1.

[0041] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0042] S1. Mix gallium oxide, cerium oxide and calcium fluoride and grind them evenly, put them into a tube furnace, heat them to 750°C at a rate of 7°C / min under nitrogen protection, keep them warm for 15 minutes, heat them to 1070°C, introduce a mixed gas of argon and oxygen (the volume ratio of argon and oxygen is 7:1), keep them warm for 100 minutes, cool them to room temperature with the furnace, and obtain doped nanomaterials with a particle size of 20-60nm;

[0043] S2, No. 32 white oil and Karamay KP6030 are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 80 minutes to obtain a premix;

[0044] S3. Stir 2,6-di-tert-butyl-p-cresol, sodium fluoride, aluminum cyclohexane and polyethylene glycol 400 for 25 minutes, add them into 60 kg of water and stir evenly, add the premix into the water under stirring, and perform ultrasonic dispersion for 100 minutes at an ultrasonic frequency of 21 kHz. Use 44 MPa high pressure homogenization for 15 seconds.

[0045] Example 4, a high stability and environmentally friendly forging lubricant for aluminum alloy wheels, the raw materials of which include: a viscosity of 30.5 mm at 40°C; 2 / s 32# white oil 18kg, 40℃ viscosity is 26.82mm 2 / s Karamay KP6030 12kg, gallium oxide 1.3kg, cerium oxide 0.7kg, calcium fluoride 3kg, emulsifier 3.5kg, oiliness agent 2kg, nano-graphene 1.7kg, 2,6-di-tert-butyl-p-cresol 0.3kg, sodium fluoride 0.05kg, aluminum cyclohexaneate 1.3kg, polyethylene glycol 400 2.5kg.

[0046] The emulsifier is obtained by mixing Span 80 and Tween 80 at a mass ratio of 1.3:1.8. The oiliness agent is obtained by mixing oleic acid and triethanolamine at a mass ratio of 2.5:1.

[0047] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0048] S1. Gallium oxide, cerium oxide and calcium fluoride are mixed and ground evenly, and then put into a tube furnace. Under nitrogen protection, the temperature is raised to 650°C at a rate of 9°C / min, and the temperature is kept for 25 minutes. The temperature is raised to 1030°C, and a mixed gas of argon and oxygen (the volume ratio of argon and oxygen is 9:1) is introduced, and the temperature is kept for 80 minutes. The mixture is cooled to room temperature with the furnace to obtain a doped nanomaterial with a particle size of 20-60nm;

[0049] S2, No. 32 white oil and Karamay KP6030 are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 100 minutes to obtain a premix;

[0050] S3. Stir 2,6-di-tert-butyl-p-cresol, sodium fluoride, aluminum cyclohexane and polyethylene glycol 400 for 15 minutes, add them into 70 kg of water and stir evenly, add the premix under stirring, and perform ultrasonic dispersion for 80 minutes at an ultrasonic frequency of 27 kHz. Use 42 MPa high pressure homogenization for 25 seconds.

[0051] Example 5, a high stability and environmentally friendly forging lubricant for aluminum alloy wheels, the raw materials of which include: a viscosity of 30.5 mm at 40°C; 2 / s 32# white oil 15kg, 40℃ viscosity is 26.92mm 2 / s Karamay KP6030 10kg, gallium oxide 1.5kg, cerium oxide 0.5kg, calcium fluoride 3.5kg, emulsifier 3kg, oiliness agent 3kg, nano-graphene 1.5kg, 2,6-di-tert-butyl-p-cresol 0.5kg, sodium fluoride 0.01kg, aluminum cyclohexaneate 1.5kg, polyethylene glycol 400 2kg.

[0052] The emulsifier is obtained by mixing Span 80 and Tween 80 in a mass ratio of 1:1. The oiliness agent is obtained by mixing oleic acid and triethanolamine in a mass ratio of 3:1.

[0053] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0054] S1. Gallium oxide, cerium oxide and calcium fluoride are mixed and ground evenly, and then put into a tube furnace. Under nitrogen protection, the temperature is raised to 700°C at a rate of 8°C / min, and the temperature is kept for 20 minutes. The temperature is then raised to 1050°C, and a mixed gas of argon and oxygen (the volume ratio of argon and oxygen is 8:1) is introduced, and the temperature is kept for 90 minutes. The mixture is cooled to room temperature with the furnace to obtain a doped nanomaterial with a particle size of 20-60nm.

[0055] S2, No. 32 white oil and Karamay KP6030 are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 90 minutes to obtain a premix;

[0056] S3. Stir 2,6-di-tert-butyl-p-cresol, sodium fluoride, aluminum cyclohexane and polyethylene glycol 400 for 20 minutes, add them into 65 kg of water and stir evenly, add the premix under stirring, and perform ultrasonic dispersion for 90 minutes at an ultrasonic frequency of 24 kHz. Use 43 MPa high pressure homogenization for 20 seconds.

[0057] Comparative Example 1: A highly stable and environmentally friendly forging lubricant for aluminum alloy wheels, the raw materials of which include: a viscosity of 30.5 mm at 40°C; 2 / s 32# white oil 15kg, 40℃ viscosity is 26.92mm 2 / s Karamay KP6030 10kg, gallium oxide 1.5kg, cerium oxide 0.5kg, calcium fluoride 3.5kg, emulsifier 3kg, oiliness agent 3kg, 2,6-di-tert-butyl-p-cresol 0.5kg, sodium fluoride 0.01kg, aluminum cyclohexaneate 1.5kg, polyethylene glycol 400 2kg.

[0058] The emulsifier is obtained by mixing Span 80 and Tween 80 in a mass ratio of 1:1. The oiliness agent is obtained by mixing oleic acid and triethanolamine in a mass ratio of 3:1.

[0059] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0060] S1. Gallium oxide, cerium oxide and calcium fluoride are mixed and ground evenly, and then put into a tube furnace. Under nitrogen protection, the temperature is raised to 700°C at a rate of 8°C / min, and the temperature is kept for 20 minutes. The temperature is then raised to 1050°C, and a mixed gas of argon and oxygen (the volume ratio of argon and oxygen is 8:1) is introduced, and the temperature is kept for 90 minutes. The mixture is cooled to room temperature with the furnace to obtain a doped nanomaterial with a particle size of 20-60nm.

[0061] S2, No. 32 white oil and Karamay KP6030 are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent and doped nanomaterial are added and stirred for 90 minutes to obtain a premix;

[0062] S3. Stir 2,6-di-tert-butyl-p-cresol, sodium fluoride, aluminum cyclohexane and polyethylene glycol 400 for 20 minutes, add them into 65 kg of water and stir evenly, add the premix under stirring, and perform ultrasonic dispersion for 90 minutes at an ultrasonic frequency of 24 kHz. Use 43 MPa high pressure homogenization for 20 seconds.

[0063] Comparative Example 2, a high-stability and environmentally friendly forging lubricant for aluminum alloy wheels, the raw materials of which include: a viscosity of 30.5 mm at 40°C; 2 / s 32# white oil 15kg, 40℃ viscosity is 26.92mm 2 / s Karamay KP6030 10kg, gallium oxide 1.5kg, calcium fluoride 3.5kg, emulsifier 3kg, oiliness agent 3kg, nanographene 1.5kg, 2,6-di-tert-butyl-p-cresol 0.5kg, sodium fluoride 0.01kg, aluminum cyclohexaneate 1.5kg, polyethylene glycol 400 2kg.

[0064] The emulsifier is obtained by mixing Span 80 and Tween 80 in a mass ratio of 1:1. The oiliness agent is obtained by mixing oleic acid and triethanolamine in a mass ratio of 3:1.

[0065] The method for preparing the above-mentioned high-stability and environmentally friendly forging lubricant for aluminum alloy wheels comprises the following steps:

[0066] S1. Mix gallium oxide and calcium fluoride and grind them evenly, put them into a tube furnace, heat them to 700°C at a rate of 8°C / min under nitrogen protection, keep them warm for 20 minutes, heat them to 1050°C, introduce a mixed gas of argon and oxygen (the volume ratio of argon and oxygen is 8:1), keep them warm for 90 minutes, cool them to room temperature with the furnace, and obtain doped nanomaterials with a particle size of 20-60nm;

[0067] S2, No. 32 white oil and Karamay KP6030 are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 90 minutes to obtain a premix;

[0068] S3. Stir 2,6-di-tert-butyl-p-cresol, sodium fluoride, aluminum cyclohexane and polyethylene glycol 400 for 20 minutes, add them into 65 kg of water and stir evenly, add the premix under stirring, and perform ultrasonic dispersion for 90 minutes at an ultrasonic frequency of 24 kHz. Use 43 MPa high pressure homogenization for 20 seconds.

[0069] The forging lubricants obtained in Example 5 and Comparative Examples 1-2 were placed at 45°C for 30 days to observe their properties. It was found that none of the three had stratification or precipitation, which confirmed that the forging lubricants obtained in Example 5 and Comparative Examples 1-2 had good stability.

[0070] With reference to GB / T 3142-2019 "Four-ball method for determination of load-bearing capacity of lubricants", a four-ball friction test was performed on the forging lubricants obtained in Example 5 and Comparative Examples 1-2 to measure their maximum non-seizure load and sintering load.

[0071] like Figure 1 As shown, the maximum non-seizure load and sintering load of the forging lubricant obtained in Example 5 are both the largest, which are better than those of Comparative Examples 1-2 (P < 0.05).

[0072] The average friction coefficient and wear spot diameter of the forging lubricants obtained in Example 5 and Comparative Examples 1-2 were measured under a high load (784 N) using a four-ball friction tester.

[0073] like Figure 2 As shown, the forging lubricant obtained in Example 5 has the lowest average friction coefficient and the smallest wear spot diameter, which is better than that of Comparative Examples 1-2 (P < 0.05).

[0074] Aluminum alloy 6061 was used as the experimental material. Each group used the forging lubricant obtained in Example 5 or Comparative Examples 1-2 for forging. Specifically, the aluminum billet was heated to about 480°C, and then placed in a rotary forging machine for preform forming. At the same time, the mold was preheated to 300°C, and each group of forging lubricants were sprayed on the mold cavity and the preform, and the preform was placed in the preforging cavity, and forging was started to obtain a preforged part; then the final forging mold was preheated to about 300°C, and each group of forging lubricants were sprayed on the mold cavity and the surface of the preforged part, and the above-mentioned groups of preforged parts were placed in the final forging mold cavity to obtain a hub rough blank. The mechanical properties of the hub rough blanks obtained in each group were tested.

[0075] like Figure 3 As shown, the tensile strength and yield strength of the wheel hub blank obtained in Example 5 are the highest, which are better than those in Comparative Examples 1-2 (P < 0.05).

[0076] The applicant believes that the reason for the above results is that the present invention uses a compound of gallium oxide and cerium oxide and grinds them in the presence of calcium fluoride, and then calcines them in a tubular furnace, so that the obtained rare earth-doped nanomaterial not only has small particles, but also has good lubricity and abradability. When combined with nano-graphene, it can reduce the friction coefficient and wear spot diameter under high load, and improve the extreme pressure resistance and service life of the lubricant.

[0077] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An environmentally friendly forging lubricant for aluminum alloy wheels, characterized in that: The raw materials are composed of the following components by mass: 10-20 parts of white oil, 5-15 parts of paraffin oil, 1-2 parts of gallium oxide, 0.1-1 parts of cerium oxide, 2-5 parts of calcium fluoride, 2-4 parts of emulsifier, 1-5 parts of oiliness agent, 1-2 parts of nanographene, 0.1-1 parts of antioxidant, 0.001-0.1 parts of sodium fluoride, 1-2 parts of aluminum naphthenate, and 1-3 parts of dispersant; Prepared by the following steps: S1. Mix gallium oxide, cerium oxide and calcium fluoride and grind them evenly. Heat them to 600-800°C under nitrogen protection, keep them warm for 10-30 minutes, heat them to 1000-1100°C, introduce a mixed gas of argon and oxygen, keep them warm for 1-2 hours, and cool them to room temperature in the furnace to obtain doped nanomaterials. S2, white oil and paraffin oil are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 1-2h to obtain a premix; S3. Stir the antioxidant, sodium fluoride, aluminum cyclohexaneate and dispersant for 10-30 minutes, add them into water and stir evenly, add the premix under stirring, ultrasonically disperse for 1-2 hours, and homogenize at 40-45 MPa high pressure for 10-30 seconds.

2. The environmentally friendly forging lubricant for aluminum alloy wheels according to claim 1, characterized in that: The viscosity of white oil at 40°C is 30.4-30.6mm 2 / s.

3. The environmentally friendly forging lubricant for aluminum alloy wheels according to claim 1, characterized in that: The paraffin oil is Karamay KP6030, and its viscosity at 40℃ is 26.45-27.21mm 2 / s.

4. The environmentally friendly forging lubricant for aluminum alloy wheels according to claim 1, characterized in that: The emulsifier is polyoxyethylene sorbitan fatty acid ester and / or sorbitan fatty acid ester.

5. The environmentally friendly forging lubricant for aluminum alloy wheels according to claim 4, characterized in that: The mass ratio of polyoxyethylene sorbitan fatty acid ester to sorbitol fatty acid ester is 1-2:1-2.

6. The environmentally friendly forging lubricant for aluminum alloy wheels according to claim 1, characterized in that: Oiliness agents include: Oleic acid, triethanolamine; The mass ratio of oleic acid to triethanolamine is 2-4:

1.

7. The environmentally friendly forging lubricant for aluminum alloy wheels according to claim 1, characterized in that: The antioxidant is 2,6-di-tert-butyl-p-cresol.

8. A method for preparing the environmentally friendly forging lubricant for aluminum alloy wheels according to any one of claims 1 to 7, characterized in that: The steps include: S1. Mix gallium oxide, cerium oxide and calcium fluoride and grind them evenly. Heat them to 600-800°C under nitrogen protection, keep them warm for 10-30 minutes, heat them to 1000-1100°C, introduce a mixed gas of argon and oxygen, keep them warm for 1-2 hours, and cool them to room temperature in the furnace to obtain doped nanomaterials. S2, white oil and paraffin oil are mixed evenly, emulsifier is added thereto and mixed evenly, oiliness agent, doped nanomaterial and nano-graphene are added and stirred for 1-2h to obtain a premix; S3. Stir the antioxidant, sodium fluoride, aluminum cyclohexaneate and dispersant for 10-30 minutes, add them into water and stir evenly, add the premix under stirring, ultrasonically disperse for 1-2 hours, and homogenize at 40-45 MPa high pressure for 10-30 seconds.

9. The method for preparing the environmentally friendly forging lubricant for aluminum alloy wheels according to claim 8, characterized in that: In S1, the volume ratio of argon to oxygen is 5-10:

1.

10. The method for preparing the environmentally friendly forging lubricant for aluminum alloy wheels according to claim 8, characterized in that: In S1, during the process of heating to 600-800°C under nitrogen protection, the heating rate is 5-10°C / min.

11. The method for preparing the environmentally friendly forging lubricant for aluminum alloy wheels according to claim 8, characterized in that: In S3, the ultrasound frequency is 20-30kHz.

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