Metal processing gear shaping oil and preparation method thereof

Abstract

The invention relates to the technical field of lubricating oil, and discloses metal processing gear shaping oil and a preparation method thereof, the metal processing gear shaping oil comprises the following components by mass: 80%-85% of 150SN, 5%-10% of synthetic ester, 6%-10% of an extreme pressure anti-wear agent, 1%-2% of an antioxidant, 0.2%-0.5% of an antirust agent, 0.1%-0.2% of an antifoaming agent, and 0.3%-0.5% of a copper corrosion inhibitor. The viscosity of the gear shaping oil is controlled by using the low-viscosity synthetic ester, so that the gear shaping oil is ensured to have good high and low temperature fluidity, lubricity, cleaning performance and the like; the extreme pressure anti-wear agent and the antioxidant are supplemented to improve the lubricating property, the bearing capacity and the stability of the gear shaping oil; and the antirust agent, the defoaming agent and the copper corrosion inhibitor are supplemented to improve the antirust performance, the foam inhibition performance and the copper-containing metal protection performance of the gear shaping oil, so that the comprehensive performance of the gear shaping oil is jointly improved, and the requirements on lubrication, cooling, cleaning and chip removal, rust prevention and the like in the metal processing process are met.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, in particular to a metalworking gear shaping oil and a preparation method thereof. Background Art

[0002] The gear shaping process is equivalent to the meshing of a pair of cylindrical gears, with the gear shaping cutter acting as a shifted gear. During gear shaping, the cutter undergoes a reciprocating motion, with the downward motion representing cutting. There is also a let-up motion, where the workpiece or cutter moves radially back a certain distance as the cutter moves upward to prevent the cutter from scratching the machined surface. There is also a generating motion and a radial feed motion.

[0003] Due to the characteristics of gear shaping, such as high efficiency, high processing precision and particularly strict surface quality requirements, special processing oil is required in gear shaping. Conventional metalworking oil is not suitable for gear shaping due to many limitations such as insufficient lubrication, poor cooling capacity, and weak cleaning and chip removal.

[0004] Existing metalworking oils have the following problems: (1) Insufficient lubricity, thin oil film thickness, and poor effective lubrication performance; (2) Poor cooling performance, which makes it impossible for the oil base to remove a large amount of heat in time during the operation of the gear shaping tool, and the tool life is reduced due to overheating; (3) Poor cleaning and chip removal performance, which makes it impossible to remove the metal chips generated by the gear shaping process in time, and the presence of metal chips on the processing surface affects the quality of the processing surface; (4) Insufficient rust prevention performance, due to chemical reactions during the use of the processing oil, the free hydrogen ions or chloride ions accelerate the corrosion of the machine or workpiece, which puts higher requirements on effective protection. Therefore, it is necessary to develop a gear shaping oil with good lubricity, excellent cooling performance, good cleaning and chip removal performance, and outstanding rust prevention performance, so that the gear shaping process has excellent lubrication, good cooling and cleaning performance, and high processing accuracy. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a metalworking gear shaping oil and a preparation method thereof, aiming to solve the above-mentioned problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A metalworking gear shaping oil comprises the following components, calculated by mass percentage: 80% to 85% of 150SN, 5% to 10% of a synthetic ester, 6% to 10% of an extreme pressure anti-wear agent, 1% to 2% of an antioxidant, 0.2% to 0.5% of a rust inhibitor, 0.1% to 0.2% of a defoaming agent, and 0.3% to 0.5% of a copper corrosion inhibitor; the synthetic ester is isooctyl stearate.

[0008] In the metalworking gear shaping oil, the extreme pressure anti-wear agent is a compound product of sulfided olefins and sulfided fatty acid methyl esters.

[0009] In the metalworking gear shaping oil, the sulphurized olefin is GS-420, and the sulphurized fatty acid methyl ester is DeoAdd MD18; the mass ratio of the GS-420 to the DeoAdd MD18 is 1:1.

[0010] In the metalworking gear shaping oil, the antioxidant is a compound product of a phenolic antioxidant and an amine antioxidant.

[0011] In the metalworking gear shaping oil, the phenolic antioxidant is 2,6-di-tert-butyl-4-methylphenol, the amine antioxidant is N,N-di-sec-butyl-p-phenylenediamine, and the mass ratio of the phenolic antioxidant to the amine antioxidant is 1:1.

[0012] The metalworking gear shaping oil, wherein the rust inhibitor is super-overbased synthetic calcium sulfonate.

[0013] The metalworking gear shaping oil, wherein the copper corrosion inhibitor is T571.

[0014] The metalworking gear shaping oil, wherein the defoaming agent is A868.

[0015] A method for preparing metalworking gear shaping oil comprises the following steps:

[0016] S1. Mix 150SN and synthetic ester in proportion and stir the mixed solution until it becomes homogeneous and transparent;

[0017] S2. Add extreme pressure antiwear agent and antioxidant to the mixed solution in step S1 and stir until the mixed solution is homogeneous and transparent;

[0018] S3. Add a rust inhibitor, a defoaming agent and a copper corrosion inhibitor to the mixed solution in step S2 in sequence and stir evenly to obtain the metalworking gear shaping oil.

[0019] The method for preparing metalworking gear shaping oil, wherein, in the step S1, the mixed solution is stirred at a temperature of 50-55° C. until it becomes homogeneous and transparent.

[0020] Beneficial effects:

[0021] The present invention provides a metalworking gear shaping oil and a preparation method thereof, which have the following advantages:

[0022] Good lubricity. The present invention uses different extreme pressure anti-wear agents to form a compound and evenly dissolve them in the base oil. When used, it can form a uniform, continuous, dense and thick oil film on the metal surface. In addition, the physical adsorption of the sulfur-containing extreme pressure anti-wear agent and the chemically generated sulfide can effectively achieve the effect of reducing wear and anti-wear, thus having good lubrication performance.

[0023] The present invention adopts high-viscosity base oil and low-viscosity synthetic ester to effectively control the viscosity of the oil and ensure that the wettability is effectively exerted.

[0024] Excellent cleaning and chip removal performance. The selected base oil and synthetic ester can play an excellent cleaning and chip removal effect, timely and effectively remove metal chips, and ensure the accuracy of the machined surface.

[0025] Outstanding anti-corrosion effect. Due to the interaction between the different antioxidants selected, the oil has an outstanding anti-corrosion effect. In addition, no synthetic ester containing chlorine is used, which prevents the chemical reaction between free chloride ions and metals, fundamentally eliminating the occurrence of corrosion problems. DETAILED DESCRIPTION

[0026] The present invention provides a metalworking gear shaping oil and a preparation method thereof. To further clarify the objectives, technical solutions, and effects of the present invention, the following examples further illustrate the present invention. It should be understood that the specific examples described herein are intended only to illustrate the present invention and are not intended to limit its scope.

[0027] The invention provides a metalworking gear shaping oil, which comprises the following components, calculated by mass percentage: 80% to 85% of 150SN, 5% to 10% of synthetic ester (isooctyl stearate), 6% to 10% of an extreme pressure anti-wear agent, 0.1% to 1.0% of an antioxidant, 0.2% to 0.5% of a rust inhibitor, 0.1% to 0.2% of a defoaming agent, and 0.3% to 0.5% of a copper corrosion inhibitor.

[0028] 150SN is used as base oil, and its viscosity is generally about 28-32mm at 40℃. 2 / s, about 5-6mm at 100℃ 2 / s. Its moderate viscosity enables it to provide excellent lubrication at various operating temperatures. Its high additive content ensures sufficient oil film thickness for gear shaping. Its specific heat capacity and thermal conductivity allow it to dissipate significant amounts of heat during circulation. 150SN also possesses an appropriate viscosity, creating a steady flow of oil during machining, effectively flushing metal chips.

[0029] Isooctyl stearate has excellent oiliness and lubricity, adsorbing onto metal surfaces to form a strong lubricating film. This further increases the film thickness and synergizes with 150SN to enhance the overall lubrication performance of the gear shaping oil. Furthermore, it exhibits excellent thermal stability and resists decomposition at high temperatures, stabilizing the oil film structure and maintaining excellent cooling properties at high temperatures, thereby enhancing the cooling function of the base oil. Isooctyl stearate's molecular structure exhibits high surface activity, reducing the oil's surface tension and allowing it to more easily penetrate the workpiece, flushing away metal chips and carrying them away with the oil flow, thereby improving cleaning and chip removal.

[0030] In some embodiments, the extreme pressure anti-wear agent is a compound product of sulfided olefins and sulfided fatty acid methyl esters. The sulfided olefin is GS-420 (Shanghai Hongze Chemical Co., Ltd.), and the sulfided fatty acid methyl ester is DeoAdd MD18 (Germany DOG); the mass ratio of the GS-420 to the DeoAdd MD18 is 1:1. The sulfided olefin GS-420 has a high active sulfur content. Under extreme pressure conditions of high temperature and high pressure, it can quickly react with the metal surface to form an iron sulfide protective film, effectively preventing direct contact and wear between metals. In addition to containing sulfur, the sulfided fatty acid methyl ester DeoAdd MD18 also has good oiliness and lubricity due to its fatty acid methyl ester structure, and can form an adsorption film on the metal surface. After the two are compounded, the sulfided olefin GS-420 provides fast and effective extreme pressure protection, and the sulfided fatty acid methyl ester DeoAdd MD18 enhances the strength and stability of the lubricating film. In addition, GS-420 has outstanding anti-wear performance under extreme pressure conditions, and DeoAdd MD18 performs well under low and medium load conditions. The two work together in a 1:1 ratio to improve the anti-wear and lubrication performance of the gear shaping oil under different load conditions, which is better than using only one sulfide.

[0031] Specifically, the antioxidant is a compound product of a phenolic antioxidant and an amine antioxidant.

[0032] More specifically, the phenolic antioxidant is 2,6-di-tert-butyl-4-methylphenol (BHT, Zhonghe Chemical (Shandong) Co., Ltd.), and the amine antioxidant is N,N-di-sec-butyl-p-phenylenediamine (44PD, Wuhan Rongcan Biotechnology Co., Ltd.); the mass ratio of the phenolic antioxidant to the amine antioxidant is 1:1. 2,6-di-tert-butyl-4-methylphenol has excellent antioxidant properties, primarily by donating hydrogen atoms to terminate free radical chain reactions and effectively capturing free radicals. N,N-di-sec-butyl-p-phenylenediamine has a unique inhibitory effect on certain oxidation reactions, particularly at high temperatures and in aerobic environments. A 1:1 ratio of the two antioxidants allows for complementary performance and synergistic effects from their different mechanisms of action, enabling the antioxidants to exert their antioxidant effects under various operating conditions and improve the antioxidant stability of the gear shaping oil.

[0033] Specifically, the rust inhibitor is an ultra-overbased synthetic calcium sulfonate (T106D, Guangzhou Ruishengyan Chemical Technology Co., Ltd.). Ultra-overbased synthetic calcium sulfonate forms a dense protective film on metal surfaces, preventing oxygen and moisture in the air, as well as acidic substances generated during processing, from contacting the metal, effectively preventing metal corrosion. Furthermore, its high base number neutralizes acidic substances that may be generated during processing, inhibiting the corrosive effects of hydrogen ions and other factors on the metal.

[0034] Specifically, the copper corrosion inhibitor is T571 (Dongguan Hongli Chemical Technology Co., Ltd.). T571 is primarily added to copper and copper alloy components. It forms a protective film on their surfaces, preventing corrosion in the machining oil. This supplements and improves the rust-proof properties of the entire gear shaping oil system, making it particularly suitable for applications where copper components may come into contact during machining.

[0035] Specifically, the defoamer is A868 (from Wanqing Chemical Technology Co., Ltd.). Gear shaping oil is prone to foaming during use due to mechanical agitation, oil flow, and contact with air. A868 defoamer reduces the oil's surface tension, making it difficult for foam to form. Furthermore, for any foam that has already formed, A868 quickly penetrates the foam film, thinning it locally and causing it to break, thus preventing it from adversely affecting the gear shaping process.

[0036] The present invention also provides a method for preparing metalworking gear shaping oil, comprising the following steps:

[0037] S1. Mix 150SN and synthetic ester in appropriate proportions and stir the mixture at 50-55°C until the mixture is homogeneous and transparent. 150SN base oil has excellent lubricity, oxidation resistance, and stability, while synthetic ester (isooctyl stearate) offers excellent lubricity and low-temperature performance. By mixing the two in appropriate proportions, you can create a more ideal base oil system.

[0038] S2. Add an extreme pressure anti-wear agent and an antioxidant to the mixed solution from step S1 and stir until the mixed solution is homogeneous and transparent. The extreme pressure anti-wear agent improves the lubrication and load-bearing capacity of the gear shaping oil. The antioxidant inhibits oxidation during use, helping to maintain the stability of other properties of the gear shaping oil, such as lubricity and cooling. These steps ensure that the extreme pressure anti-wear agent and antioxidant are evenly dispersed in the mixed solution, ensuring their full effectiveness throughout the entire gear shaping oil system.

[0039] S3. A rust inhibitor, a defoamer, and a copper corrosion inhibitor are sequentially added to the mixed solution from step S2 and stirred uniformly to produce the metalworking gear shaping oil. The rust inhibitor improves the rust prevention properties of the gear shaping oil. The defoamer suppresses and eliminates foaming generated by the gear shaping oil. The copper corrosion inhibitor improves the protective properties of the gear shaping oil against copper-containing metals. The addition of these additives collectively improves the overall performance of the gear shaping oil, meeting the multiple requirements of lubrication, cooling, chip cleaning and removal, and rust prevention during metalworking.

[0040] In order to further illustrate the metalworking gear shaping oil and its preparation method provided by the present invention, the following examples and comparative examples are provided.

[0041] Test method:

[0042] The test objects of the present invention are the oils prepared in the embodiments and comparative examples.

[0043] (1) Viscosity is determined in accordance with GB / T 265 Petroleum Products Kinematic Viscosity Determination and Dynamic Viscosity Calculation Method.

[0044] (2) Open cup flash point is determined in accordance with GB / T 3536, Petroleum Products, Determination of Flash Point and Fire Point (Cleveland Open Cup Method).

[0045] (3) Pour point is determined in accordance with GB / T 3535 Pour point determination method for petroleum products.

[0046] (4) The four-ball test is carried out in accordance with GB / T 12583 Lubricant Extreme Pressure Performance Determination Method (Four-ball Method).

[0047] (5) Rotary oxygen and nitrogen testing shall be carried out in accordance with SH / T 0193 Lubricating oil antioxidant stability test method.

[0048] (6) Liquid phase corrosion is carried out in accordance with the anti-rust performance test method of mineral oil with inhibitor in the presence of water as specified in GB / T 11143.

[0049] (7) Foam was tested in accordance with GB / T 12579-2002 Lubricating Oil Foam Characteristics Test Method.

[0050] (8) There is no standard method for tapping torque. Follow the operating instructions of the Microtap / Maikotaipu (model TTT systen G8) tapping torque tester.

[0051] Experiment 1

[0052] Table 1 Composition of components of Example 1-1, Example 1-2, Example 1-3, Comparative Example 1-1, Comparative Example 1-2 and Comparative Example 1-3

[0053]

[0054] Table 2 Stability test results of Example 1-1, Example 1-2, Example 1-3, Comparative Example 1-1, Comparative Example 1-2 and Comparative Example 1-3

[0055]

[0056] As can be seen from Table 2, Example 1-1 has moderate viscosity, and performs best in terms of viscosity index, open-cell flash point, and pour point. In terms of viscosity: Comparative Example 1-1 has the highest viscosity, but a poor viscosity index. Comparative Example 1-3 has moderate viscosity and viscosity index, while Comparative Example 1-2 has low viscosity and low viscosity index. In terms of open-cell flash point: Comparative Example 1-1 is second, Comparative Example 1-3 performs moderately, and Comparative Example 1-1 is the worst. In terms of pour point: Comparative Example 1-2 is second, Comparative Example 1-3 performs moderately, and Comparative Example 1-2 is the worst. It can be seen that when base oil and synthetic ester are used in appropriate proportions, the viscosity, viscosity index, open-cell flash point, and pour point can all meet the requirements for use.

[0057] Experiment 2

[0058] According to the component composition in Table 3, Example 2, Comparative Example 2-1, Comparative Example 2-2 and Comparative Example 2-3 were prepared.

[0059] Table 3 Components of Example 2, Comparative Example 2-1, Comparative Example 2-2 and Comparative Example 2-3

[0060]

[0061] Table 4 Test results of PB and PD of Example 2, Comparative Example 2-1, Comparative Example 2-2 and Comparative Example 2-3

[0062]

[0063]

[0064] Table 5 Test results of tapping torque of Example 2, Comparative Example 2-1, Comparative Example 2-2 and Comparative Example 2-3

[0065] sample △T(℃) Average torque (Ncm) Average torque (Ncm) Example 2 3.5 90.27 123 Comparative Example 2-1 9.8 102.73 141 Comparative Example 2-2 5.5 97.28 135 Comparative Examples 2-3 4.2 95.80 132

[0066] Table 4 shows the results of four-ball PB and PD tests of lubrication performance for Example 2, Comparative Example 2-1, Comparative Example 2-2, and Comparative Example 2-3. Example 2 exhibits the best lubrication performance, followed by Comparative Example 2-3 and Comparative Example 2-2 exhibits intermediate lubrication performance, followed by Comparative Example 2-2 and Comparative Example 2-1, respectively. This indicates that only when two extreme pressure anti-wear agents are combined and added in appropriate proportions to form a dense oil film on the metal surface can friction be effectively reduced and effective lubrication be achieved. Furthermore, Example 2 exhibits the best temperature rise performance, followed by Comparative Example 2-3, Comparative Example 2-2 exhibits intermediate performance, and Comparative Example 2-1 exhibits the worst performance. This demonstrates that lubrication performance directly influences temperature rise, which can address the challenge of oil overheating during machining.

[0067] Experiment 3

[0068] According to the component composition of Table 6, Example 3-1, Example 3-2, Comparative Example 3-1, Comparative Example 3-2, and Comparative Example 3-3 were prepared.

[0069] Table 6 Component composition of Example 3-1, Example 3-2 and Comparative Example 3-1, Comparative Example 3-2

[0070]

[0071]

[0072] Table 7 Rotary oxygen and nitrogen test results of Example 3-1, Example 3-2 and Comparative Example 3-1, Comparative Example 3-2, Comparative Example 3-3

[0073]

[0074]

[0075] The results of the rotary oxygen-nitrogen test for Example 3-1, Example 3-2, Comparative Example 3-1, Comparative Example 3-2, and Comparative Example 3-3 are shown in Table 7. Example 3-1 performs best, Example 3-2 performs second best, Comparative Examples 3-1 and 3-2 perform moderately, and Comparative Example 3-3 performs worst. Table 7 provides the following conclusions: Antioxidants have a significant antioxidant effect in oil products; relying solely on the antioxidant capacity of the base oil is clearly insufficient (Comparative Example 3-3); adding a single antioxidant does not achieve a synergistic antioxidant effect (Comparative Examples 3-1 and 3-2); therefore, the appropriate proportion of antioxidants must be added to achieve the desired effect.

[0076] Experiment 4

[0077] According to the component composition in Table 8, Example 4-1, Example 4-2, Comparative Example 4-1, and Comparative Example 4-2 were prepared.

[0078] Table 8 Component composition of Example 4-1, Example 4-2, Comparative Example 4-1, Comparative Example 4-2

[0079]

[0080]

[0081] Table 9 Antirust performance test results of Example 4-1, Example 4-2, Comparative Example 4-1, Comparative Example 4-2

[0082] sample Rust condition Hydrolysis Example 4-1 No rust normal Example 4-2 No rust normal Comparative Example 4-1 rust normal Comparative Example 4-2 No rust hydrolysis

[0083] The rust prevention performance test results for Example 4-1, Example 4-2, Comparative Example 4-1, and Comparative Example 4-2 are shown in Table 9. Examples 4-1 and 4-2 exhibit the best rust prevention performance, while Comparative Example 4-1 exhibits relatively poor rust prevention. The present system exhibits optimal rust prevention performance when the rust inhibitor dosage is between 0.2% and 0.5%. Lower dosages of rust inhibitor have little rust prevention effect. Excessive dosages can affect the dispersion of the rust inhibitor on the processed surface, increasing the risk of hydrolysis.

[0084] Experiment 5

[0085] According to the component composition of Table 10, Example 5, Comparative Example 5-1, Comparative Example 5-2 and Comparative Example 5-3 were prepared.

[0086] Table 10 Component composition of Example 5, Comparative Example 5-1, Comparative Example 5-2 and Comparative Example 5-3

[0087]

[0088] Table 11 Corrosion performance test results of Example 5, Comparative Example 5-1, Comparative Example 5-2 and Comparative Example 5-3

[0089]

[0090]

[0091] The copper corrosion inhibition test results of Example 5, Comparative Example 5-1, Comparative Example 5-2 and Comparative Example 5-3 are shown in Table 11: Example 5 has the best copper corrosion inhibition, Comparative Example 5-1 performs the worst, Comparative Example 5-2 and Comparative Example 5-3 are equivalent to Example 5, but there is a risk of precipitation due to excessive addition of copper corrosion inhibitor in Comparative Example 5-3, so it is better to add it in an appropriate proportion.

[0092] Experiment 6

[0093] According to the component composition of Table 12, Example 6, Comparative Example 6-1, Comparative Example 6-2 and Comparative Example 3 were prepared.

[0094] Table 12 Component composition of Example 6, Comparative Example 6-1, Comparative Example 6-2 and Comparative Example 3

[0095]

[0096]

[0097] Table 13 Defoaming performance test results of Example 6, Comparative Example 6-1, Comparative Example 6-2 and Comparative Example 6-3

[0098] sample 24℃ 93.5℃ 24℃ Whether precipitation Example 6-1 5 10 5 no Comparative Example 6-1 100 60 120 no Comparative Example 6-2 20 40 25 no Comparative Example 6-3 5 15 5 yes

[0099] The foaming test results of Example 6, Comparative Example 6-1, Comparative Example 6-2 and Comparative Example 6-3 are shown in Table 13: Example 6 has the best foaming resistance, Comparative Example 6-1 performs the worst, Comparative Example 6-2 performs second best, and Comparative Example 6-3 is comparable to Example 6. However, the excessive amount of defoamer added in Comparative Example 6-3 makes it difficult to dissolve in the gear shaping oil, posing a risk of precipitation.

[0100] The above experiments demonstrate that different viscosity effects can be achieved by selecting specific types and proportions of higher-viscosity base oils, combined with low-viscosity isooctyl stearate in appropriate proportions. The combination and addition ratios of two different extreme pressure anti-wear agents yield different lubrication properties. The selection and addition ratios of different amine and phenolic antioxidants also lead to varying antioxidant effects. Different proportions of rust inhibitors also yield different rust-preventing effects. Different proportions of copper corrosion inhibitors also yield different copper corrosion inhibition effects.

[0101] In summary, the present invention adopts different extreme pressure anti-wear agents for compounding, and is uniformly dissolved in the base oil. When used, a uniform, continuous, dense and thick oil film can be formed on the metal surface. In addition, the physical adsorption of the sulfur-containing extreme pressure anti-wear agent and the chemically generated sulfide can effectively achieve the effect of reducing wear and resisting wear, thereby having better lubrication performance. The present invention adopts a high-viscosity base oil and a low-viscosity synthetic ester to effectively control the viscosity of the oil, ensure that the wettability is effectively exerted, and ensure that the cooling performance of the oil is good. Since the selected base oil and synthetic ester can play a good cleaning and chip removal effect, the metal chips are removed in time and effectively, and the accuracy of the machined surface is guaranteed. Due to the interaction between the selected different antioxidants, the anti-rust effect of the oil is outstanding, and the synthetic ester containing chlorine element is not used, so as to avoid the chemical reaction of the free chloride ions with the metal, and prevent the occurrence of corrosion problems.

[0102] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. A metalworking gear shaping oil, characterized in that: The invention comprises the following components calculated by mass percentage: 150SN: 80% to 85%, synthetic ester: 5% to 10%, extreme pressure anti-wear agent: 6% to 10%, antioxidant: 1% to 2%, rust inhibitor: 0.2% to 0.5%, defoaming agent: 0.1% to 0.2%, and copper corrosion inhibitor: 0.3% to 0.5%; the synthetic ester is isooctyl stearate.

2. The metalworking gear shaping oil according to claim 1, characterized in that: The extreme pressure anti-wear agent is a compound product of sulfided olefins and sulfided fatty acid methyl esters.

3. The metalworking gear shaping oil according to claim 2, characterized in that: The sulfided olefin is GS-420, and the sulfided fatty acid methyl ester is DeoAdd MD18; the mass ratio of the GS-420 to the DeoAdd MD18 is 1:

1.

4. The metalworking gear shaping oil according to claim 1, characterized in that The antioxidant is a compound product of a phenolic antioxidant and an amine antioxidant.

5. The metalworking gear shaping oil according to claim 4, characterized in that: The phenolic antioxidant is 2,6-di-tert-butyl-4-methylphenol, and the amine antioxidant is N,N-di-sec-butyl-p-phenylenediamine; the mass ratio of the phenolic antioxidant to the amine antioxidant is 1:

1.

6. The metalworking gear shaping oil according to claim 1, characterized in that The rust preventive agent is super-overbased synthetic calcium sulfonate.

7. The metalworking gear shaping oil according to claim 1, characterized in that: The copper corrosion inhibitor is T571.

8. The metalworking gear shaping oil according to claim 1, characterized in that: The defoaming agent is A868.

9. A method for preparing metalworking gear shaping oil, characterized in that: The steps include: S1. Mix 150SN and synthetic ester in proportion and stir the mixed solution until it becomes homogeneous and transparent; S2. Add extreme pressure antiwear agent and antioxidant to the mixed solution in step S1 and stir until the mixed solution is homogeneous and transparent; S3. Add a rust inhibitor, a defoaming agent, and a copper corrosion inhibitor to the mixed solution in step S2 in sequence, and stir evenly to obtain the metalworking gear shaping oil according to any one of claims 1 to 8.

10. The method for preparing metalworking gear shaping oil according to claim 9, characterized in that: In the step S1, the mixed solution is stirred at a temperature of 50-55° C. until it becomes homogeneous and transparent.

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