Gear shaving oil for metal processing and preparation method thereof

Abstract

The invention belongs to the technical field of gear shaving oil, and particularly discloses metal processing gear shaving oil and a preparation method thereof.The metal processing gear shaving oil is prepared from, by mass, 80%-90% of composite base oil, 8%-18% of an extreme pressure anti-wear agent, 1.0%-2.0% of an antioxidant, 0.02%-0.05% of an anti-rust agent and 0.01%-0.03% of a defoaming agent; the components are uniformly mixed in sequence to obtain the gear shaving oil for metal processing. The metal processing gear shaving oil with a brand new formula system, provided by the invention, has excellent lubricating performance, antioxidant performance, anti-rust performance and cooling performance; and the method can be better applied to the specific environment of metal gear shaving machining.

Description

Technical Field

[0001] The invention belongs to the technical field of gear shaving oil, and in particular relates to metal processing gear shaving oil and a preparation method thereof. Technical Background

[0002] Gear shaving is based on the principle of meshing a pair of helical gears with unequal helix angles. The shaving cutter intersects the axis of the gear being cut at an angle in space, and their meshing is a free, double-sided, free-developing motion with no backlash.

[0003] The process of gear shaving is a free expansion motion in which the shaving cutter and the gear being cut are tightly meshed on both sides of the gear teeth, achieving a fine cutting process. Since gear shaving requires high precision, high efficiency and a wide processing range, special metalworking oil is needed in the gear shaving process. Conventional metalworking oil is not suitable for metal gear shaving due to many limitations such as insufficient extreme pressure lubrication, poor antioxidant performance, slow cooling performance, and poor rust resistance.

[0004] Commonly used metalworking oils mainly include stamping oil, cutting oil and grinding oil, etc., but their processing characteristics and performance cannot meet the processing needs of gear shaving. At present, there is little public information on gear shaving oil, and there is no literature information available. There is only some literature information related to cutting oil. Although it can be barely applied to gear shaving processing technology, its disadvantages are insufficient lubricity and poor cooling performance, which cannot meet the actual performance requirements of gear shaving processing. Summary of the Invention

[0005] In view of the limitations of the existing methods described above, the purpose of the present invention is to propose a metalworking shaving oil and a preparation method thereof to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A metalworking shaving oil, comprising the following components by mass percentage:

[0008] Composite base oil 80%-90%;

[0009] Extreme pressure anti-wear agent 8%-18%;

[0010] Antioxidant 1.0%-2.0%;

[0011] Rust inhibitor 0.02%-0.05%;

[0012] Defoaming agent 0.01%-0.03%;

[0013] The composite base oil comprises base oil 150N and coal-based 3# base oil in a mass ratio of (52-54):(30-32);

[0014] The kinematic viscosity of the composite base oil at 40°C is 20 mm 2 / s-21mm 2 / s;

[0015] The kinematic viscosity of the composite base oil at 100°C is 4.3 mm 2 / s-4.4mm 2 / s.

[0016] This application utilizes a specifically defined composite base oil formulation, supplemented with various additives adapted to the system, to achieve superior antioxidant properties, reduce friction loss, and exhibit excellent cooling medium performance, effectively meeting the practical needs of metalworking gear shaving oils. This application has discovered that a composite base oil specifically selected with a mass ratio of base oil 150N: coal-based base oil #3 = (52-54): (30-32) can simultaneously achieve improvements in kinematic viscosity at 40°C, kinematic viscosity at 100°C, viscosity index, open-circuit flash point, and pour point. Furthermore, the aforementioned base oil 150N and coal-based base oil #3 have repeatable carbon chain structures, which form active free radicals that readily react with functional groups such as ester, hydroxyl, and amino groups, thereby achieving, for example, rust prevention, antioxidant, and lubrication effects.

[0017] Further, the extreme pressure anti-wear agent includes a first extreme pressure anti-wear agent and a second extreme pressure anti-wear agent;

[0018] The content of the first extreme pressure anti-wear agent in the metalworking shaving oil is 2%-7% by mass;

[0019] Measured by mass percentage, the content of the second extreme pressure anti-wear agent in the metalworking shaving oil is 6%-11%.

[0020] Furthermore, the first extreme pressure anti-wear agent is the extreme pressure anti-wear agent sulfurized fatty acid ester 2050; and the second extreme pressure anti-wear agent is the extreme pressure anti-wear agent sulfurized fatty acid ester 3026.

[0021] The present applicant has discovered that a specific composition of the extreme pressure anti-wear agents sulfurized fatty acid ester 2050 and sulfurized fatty acid ester 3026 can further enhance the technical benefits of the aforementioned solution. This composition can form a dense oil film on the surface of the metal material, enhancing its anti-wear capabilities under moderate loads and reducing wear on the metal surface under moderate conditions. It can also enhance load resistance and prevent sintering under high loads. However, altering this specific ratio significantly impacts the effectiveness of this solution. This technical aspect directly affects the temperature rise, a significant problem in overheating during metal processing and a common problem when existing cutting oils are used in place of shaving oils for gear shaving.

[0022] Furthermore, the rust inhibitor includes super-overbased synthetic calcium sulfonate, and the total base number of the super-overbased synthetic calcium sulfonate is not less than 385 mg KOH / g.

[0023] Furthermore, the present application adds an ultra-high base synthetic calcium sulfonate rust inhibitor T106D, which can play a role in removing and purifying acidic substances produced during the use of shaving oil, thereby preventing the shaving oil from acidifying and causing rust on the metal during use, and increasing the rust resistance of the shaving oil. A specific content of the ultra-high base synthetic calcium sulfonate rust inhibitor T106D can achieve the best effect in the shaving oil provided by the present application. The present application has conducted research on this and found that the effect of 0.02% content is the best. The effect is poor when the amount is lower than this value, and it will have a negative effect on the performance of the lubricant PB when the amount is higher than this value.

[0024] Furthermore, the defoaming agent is the composite defoaming agent T921. The composite defoaming agent T921 added in the present application can reduce the surface tension of the oil, prevent the generation of foam or reduce or even eliminate the foam, thereby preventing the generation of large foam during the use of the shaving oil and causing problems in the working conditions. The present application also studied the content of the composite defoaming agent T921 in the shaving oil and found that when the content is low, it cannot achieve sufficient defoaming performance; when the content is too high, there is a risk of precipitation. Therefore, a specific content of the composite defoaming agent T921 can fully form a thin film on the surface of the liquid, thereby preventing the formation and stabilization of bubbles, and further achieving the defoaming function.

[0025] Further, the antioxidant includes phenolic antioxidants and amine antioxidants;

[0026] The content of the phenolic antioxidant in the metalworking shaving oil is 0.5%-1% by mass.

[0027] Measured by mass percentage, the content of the above-mentioned amine antioxidant in the above-mentioned metalworking shaving oil is 0.5%-1%.

[0028] Furthermore, the phenolic antioxidant is antioxidant T551, and the above-mentioned amine antioxidant is antioxidant L57;

[0029] In the metalworking shaving oil, the ratio of the phenolic antioxidant T551 to the amine antioxidant L57 is 1:1 by weight.

[0030] The present application found that when only amine antioxidants or phenolic antioxidants are added, the antioxidant and corrosion resistance is poor. At this time, the only way to rely more on the antioxidant capacity of the base oil is to use the shaving oil, which leads to serious lack of antioxidant performance. If too many antioxidants are added at the same time, the synergistic effect tends to the threshold and cannot achieve better results. Therefore, the addition ratio of antioxidants and rust inhibitors provided in the present application can achieve the best antioxidant effect, thereby forming a protective film on the metal surface, reducing the activity of the metal while isolating it from the air and moisture in the environment, achieving the effect of a multiple passivation layer protective film, providing longer-lasting protection and more excellent protection effect.

[0031] Preferably, the following ingredients are contained in percentage by mass:

[0032] Base oil 150N 53%;

[0033] Coal-based 3# base oil 30.95%;

[0034] Extreme pressure anti-wear agent sulfurized fatty acid ester 2050 5%;

[0035] Extreme pressure anti-wear agent sulfurized fatty acid ester 3026 10%;

[0036] Antioxidant T551 0.5%;

[0037] Antioxidant L57 0.5%;

[0038] Rust inhibitor T106D 0.02%;

[0039] Defoaming agent T921 0.03%.

[0040] Furthermore, the preparation method of the metalworking shaving oil comprises the following steps:

[0041] The above-mentioned base oil 150N and the above-mentioned coal-based 3# base oil are mixed and stirred at 50°C-55°C, and the temperature is maintained throughout the process. The above-mentioned extreme pressure anti-wear agent is added and stirred evenly. Then, the above-mentioned antioxidant, the above-mentioned rust inhibitor and the above-mentioned defoaming agent are added and stirred until uniform to obtain the above-mentioned metalworking gear shaving oil. The beneficial effects of the present invention are:

[0042] The metalworking shaving oil provided in this application has the following excellent properties:

[0043] (1) Excellent lubrication performance: The extreme pressure anti-wear agent compounded in a specific ratio in the present invention is uniformly dissolved in a composite base oil formulated in a specific ratio. When used, it can form a uniform, continuous, and dense oil film on the metal surface, giving it excellent kinematic viscosity, improving performance under medium and high load conditions, and thus forming a good lubrication effect during the production process;

[0044] (2) Excellent cooling performance: Due to the good thermal conductivity of the composite base oil formula selected in a specific ratio, it can reduce the problem of overheating in local metal processing and avoid shortening the service life of the tool due to excessive fatigue;

[0045] (3) Excellent antioxidant and rust-proof properties: The present invention adopts a base oil with a low acid value and an antioxidant and a rust-proof agent in a specific formula ratio as additives, and avoids the use of chloride lubricating additives that are prone to corrosion, so that the antioxidant and the rust-proof agent therein have an excellent synergistic effect, forming a composite protective film during the processing process, which fully reduces the metal activity on the surface of the processed workpiece. At the same time, the composite multi-layer protective film formed by the antioxidant and the rust-proof agent prevents the metal workpiece from contacting with air and moisture, so that rust will not occur during the long-term shaving process. DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments to clearly and completely describe the concept and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict.

[0047] 1. Raw materials and preparation methods:

[0048] 1. Raw materials:

[0049] Base oil: Model 150N, manufactured by CNOOC Huizhou Petrochemical Co., Ltd.

[0050] Coal-based 3# base oil: Model Lu'an 3# base oil, produced by Shanxi Lu'an Coal-based Clean Energy Co., Ltd.

[0051] Extreme pressure anti-wear agent: extreme pressure anti-wear agent sulfurized fatty acid ester model 2050, produced by Simin Oil Chemical Trading (Shanghai) Co., Ltd.

[0052] Extreme pressure anti-wear agent: extreme pressure anti-wear agent sulfurized fatty acid ester model 3026, produced by Guangzhou Wei Bo Technology Co., Ltd.;

[0053] Phenolic antioxidant: Model T551, manufactured by Zibo Huihua Chemical Co., Ltd.

[0054] Amine antioxidant: Model L57, manufactured by Naiou Trading (Shanghai) Co., Ltd.

[0055] Rust inhibitor: Super-high base synthetic calcium sulfonate, model T106D, manufactured by Guangzhou Ruishengyan Chemical Technology Co., Ltd.

[0056] Defoaming agent: Model T921, manufactured by Jinzhou Shengda Chemical Co., Ltd.

[0057] 2. Preparation method:

[0058] Mix base oil 150N and coal-based 3# base oil at 50°C-55°C and stir evenly, maintain this temperature throughout the process, add extreme pressure anti-wear agent, stir evenly, then add antioxidant, rust inhibitor and defoaming agent, stir until uniform, and obtain the metalworking shaving oil provided in this application.

[0059] II. Evaluation Items and Test Methods

[0060] (1) Viscosity test: GB / T 265-1988 Determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products;

[0061] (2) Open cup flash point test: GB / T 3536-2008 Petroleum products - Determination of flash point and fire point - Cleveland open cup method;

[0062] (3) Pour point test: GB / T 353-2006 Determination of pour point of petroleum products;

[0063] (4) Lubricant extreme pressure performance test: GB / T 12583-1998 Determination of extreme pressure performance of lubricants (four-ball method);

[0064] (5) Rotary oxygen and nitrogen test: "SH / T 0193-2008 Determination of oxidation stability of lubricating oils - Rotary oxygen and nitrogen method";

[0065] (6) Liquid phase corrosion test: GB / T 11143-2008 Test method for rust prevention of mineral oil with inhibitor in the presence of water;

[0066] (7) Foam test: GB / T 12579-2002 Determination of foam characteristics of lubricating oils;

[0067] (8) Tapping torque: Test instrument operating manual and equipment readings.

[0068] 3. Preparation, performance testing and discussion of corresponding results of examples and comparative examples

[0069] 1. Preparation and performance testing of Example 1, Comparative Example 1, Comparative Example 2 and Comparative Example 3:

[0070] (1) Raw materials and preparation methods used in Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3: The preparation methods of each embodiment and comparative example are as described in the preparation methods above. The specific percentages of the components are shown in Table 1, where all percentages are by mass.

[0071] Table 1

[0072] Element Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 150N 53％ 43％ 0％ 83.95％ 3# base oil 30.95％ 40.95％ 83.95％ 0％ 2050 5％ 5％ 5％ 5％ 3026 10％ 10％ 10％ 10％ T551 0.5％ 0.5％ 0.5％ 0.5％ L57 0.5％ 0.5％ 0.5％ 0.5％ T106D 0.02％ 0.02％ 0.02％ 0.02％ T921 0.03％ 0.03％ 0.03％ 0.03％

[0073] (2) Performance testing and results discussion

[0074] Viscosity, open-cup flash point, and pour point were tested in accordance with GB / T 265-1988 Petroleum Products - Determination of Kinematic Viscosity and Calculation of Dynamic Viscosity, GB / T 3536-2008 Petroleum Products - Determination of Flash Point and Fire Point - Cleveland Open Cup Method, and GB / T 353-2006 Petroleum Products - Determination of Pour Point. The results are detailed in Table 2. Example 1 exhibited the best viscosity, viscosity index, open-cup flash point, and pour point performance. Comparative Example 3 performed second best in terms of viscosity and viscosity index, while Comparative Example 1 and Comparative Example 2 exhibited relatively poor viscosities and viscosity indices. For open-cup flash point, Comparative Example 3 performed second, Comparative Example 2 performed in the middle, and Comparative Example 1 performed the worst. For pour point, Comparative Example 3 performed second, Comparative Example 2 performed in the middle, and Comparative Example 1 performed the worst. By combining base oils of varying viscosities and synthetic esters in appropriate proportions, optimal values ​​for viscosity, viscosity index, open-cup flash point, and pour point were achieved.

[0075] Table 2

[0076]

[0077] 2. Preparation and performance testing of Example 1, Comparative Example 4, Comparative Example 5 and Comparative Example 6:

[0078] (1) Raw materials and preparation methods used in Example 1, Comparative Example 4, Comparative Example 5 and Comparative Example 6: The preparation methods of each embodiment and comparative example are as described in the preparation method above. The specific composition percentages are shown in Table 3, where all percentages are by mass.

[0079] Table 3

[0080] Element Example 1 Comparative Example 4 Comparative Example 5 Comparative Example 6 150N 53％ 53％ 53％ 53％ 3# base oil 30.95％ 30.95％ 30.95％ 30.95％ 2050 5％ 15％ 0％ 10％ 3026 10％ 0％ 15％ 5％ T551 0.5％ 0.5％ 0.5％ 0.5％ L57 0.5％ 0.5％ 0.5％ 0.5％ T106D 0.02％ 0.02％ 0.02％ 0.02％ T921 0.03％ 0.03％ 0.03％ 0.03％

[0081] (2) Performance testing and results discussion

[0082] The extreme pressure performance of each sample was tested in accordance with GB / T 12583-1998 Determination of Extreme Pressure Performance of Lubricants (Four-Ball Method). The specific results are shown in Table 4. The tapping torque performance was tested using a tapping torque tester. The specific test results are shown in Table 5.

[0083] Table 4

[0084] sample Appearance PB(kg) PD(kg) Example 1 Uniform 119 620 Comparative Example 4 Uniform 100 400 Comparative Example 5 Uniform 109 620 Comparative Example 6 Uniform 104 500

[0085] The test results in Table 4, obtained according to GB / T 12583-1998, Determination of Extreme Pressure Properties of Lubricants (Four-Ball Method), show that Example 1 exhibits the best lubrication performance, followed by Comparative Example 5, Comparative Example 6 performs moderately well, and Comparative Example 4 performs the worst. Analysis indicates that the addition of extreme pressure anti-wear agents in appropriate proportions can form a dense oil film on the metal surface, reducing friction and thus achieving excellent lubrication.

[0086] Table 5

[0087]

[0088] As shown in Table 5, using a tapping torque tester, Example 1 exhibits the best temperature rise performance, followed by Comparative Example 5, Comparative Example 6 performs moderately well, and Comparative Example 4 performs the worst. This suggests that lubrication performance directly impacts temperature rise, and the formulation used in Example 1, as provided herein, exhibits excellent temperature rise control, significantly contributing to addressing the challenge of oil overheating during machining.

[0089] 3. Preparation and performance testing of Example 1, Comparative Example 7, Comparative Example 8 and Comparative Example 9:

[0090] (1) Raw materials and preparation methods used in Example 1, Comparative Example 7, Comparative Example 8 and Comparative Example 9: The preparation methods of each embodiment and comparative example are as described in the preparation method above. The specific composition percentages are shown in Table 6, where all percentages are by mass.

[0091] Table 6

[0092] Element Example 1 Comparative Example 7 Comparative Example 8 Comparative Example 9 150N 53％ 53％ 53％ 53％ 3# base oil 30.95％ 30.95％ 30.95％ 30.95％ 2050 5％ 5％ 5％ 5％ 3026 10％ 10％ 10％ 10％ T551 0.5％ 0％ 1％ 1％ L57 0.5％ 1％ 0％ 1％ T106D 0.02％ 0.02％ 0.02％ 0.02％ T921 0.03％ 0.03％ 0.03％ 0.03％

[0093] (2) Performance testing and results discussion

[0094] The rotary oxygen and nitrogen test was performed on each embodiment and comparative example according to "SH / T 0193-2008 Determination of Oxidation Stability of Lubricating Oils - Rotary Oxygen and Nitrogen Method". The specific results are shown in Table 7.

[0095] Table 7

[0096] sample Appearance Time (min) Copper corrosion level Example 1 Uniform 245 1B Comparative Example 7 Uniform 96 2C Comparative Example 8 Uniform 162 1B Comparative Example 9 Uniform 209 1B

[0097] From the results of the rotating oxygen-nitrogen test in Table 7, it can be seen that Example 1 performs best, Comparative Example 9 performs second, Comparative Example 8 performs medium, and Comparative Example 7 performs worst. The copper corrosion performance of Example 1, Comparative Example 8 and Comparative Example 9 is consistent, and Comparative Example 7 performs worst. The following conclusions can be drawn from Table 7: Antioxidants have a very obvious antioxidant effect in oil products. When only phenolic antioxidants or amine antioxidants are added, the antioxidant capacity is relatively poor, and more can only rely solely on the antioxidant capacity of the base oil, and the antioxidant effect is obviously insufficient. Single addition of antioxidants or addition of excessive antioxidants will not achieve a synergistic antioxidant effect; therefore, the proportion of added antioxidants must be appropriate to achieve the desired effect. Specifically, T551 mainly plays a role in copper corrosion inhibition. The effect does not change significantly when the amount added is large. Without copper addition, the corrosion inhibition effect is poor, or even no copper corrosion inhibition effect is achieved.

[0098] 4. Preparation and performance testing of Example 1, Comparative Example 10, Comparative Example 11 and Comparative Example 12:

[0099] (1) Raw materials and preparation methods used in Example 1, Comparative Example 10, Comparative Example 11 and Comparative Example 12: The preparation methods of each embodiment and comparative example are as described in the preparation method above. The specific composition percentages are shown in Table 8, where all percentages are by mass.

[0100] Table 8

[0101]

[0102] (2) Performance testing and results discussion

[0103] The anti-rust performance of each sample was tested in accordance with GB / T 11143-2008 Test method for anti-rust performance of mineral oil with inhibitor in the presence of water. The specific results are shown in Table 9.

[0104] Table 9

[0105] sample Rust condition Lubrication PB (kg) Example 1 No rust 119 Comparative Example 10 rust 119 Comparative Example 11 rust 119 Comparative Example 12 No rust 114

[0106] The rust prevention test results in Table 9 show that Example 1 and Comparative Example 12 have the best rust prevention properties, while Comparative Examples 10 and 11 have relatively poor rust prevention properties. The rust inhibitor in the present system is most effective at a dosage of 0.02%. Lower dosages do not provide optimal rust prevention, while higher dosages can negatively impact lubrication.

[0107] 5. Preparation and performance testing of Example 1, Comparative Example 14, Comparative Example 15 and Comparative Example 16:

[0108] (1) Raw materials and preparation methods used in Example 1, Comparative Example 14, Comparative Example 15 and Comparative Example 16: The preparation methods of each embodiment and comparative example are as described in the preparation method above. The specific percentages of the components are shown in Table 10, where all percentages are by mass.

[0109] Table 10

[0110] Element Example 1 Comparative Example 14 Comparative Example 15 Comparative Example 16 150N 53％ 53％ 53％ 53％ 3# base oil 30.95％ 30.95％ 30.95％ 30.95％ 2050 5％ 5％ 5％ 5％ 3026 10％ 10％ 10％ 10％ T551 0.5％ 0.5％ 0.5％ 0.5％ L57 0.5％ 0.5％ 0.5％ 0.5％ T106D 0.02％ 0.02％ 0.02％ 0.02％ T921 0.03％ 0％ 0.01％ 0.05％

[0111] (2) Performance testing and results discussion

[0112] The defoaming performance of each sample was tested in accordance with GB / T 12579-2002 Determination of Foam Characteristics of Lubricating Oils. The specific results are shown in Table 11.

[0113] Table 11

[0114] sample 24℃ 93.5℃ 24℃ Example 1 5 10 5 Comparative Example 14 100 80 100 Comparative Example 15 30 50 30 Comparative Example 16 5 10 5

[0115] From the defoaming performance test results in Table 11, it can be seen that Example 1 has the best antifoaming property, Comparative Examples 14 and 15 perform poorly, and Comparative Example 16 has the same effect as Example 1, but there is a risk of precipitation caused by excessive addition of defoaming agent. At this time, the defoaming performance has reached the threshold, and excessive addition cannot improve the corresponding performance. Therefore, the amount of defoaming agent added can be controlled within an appropriate range.

[0116] In summary, the present invention has developed a gear shaving oil through targeted research and development to address many problems arising in the gear shaving process, so that it has balanced and stable lubrication performance. In addition, in response to the problems of cooling and antioxidant properties in the prior art, the present invention fully considers the properties and matching methods of the additives, and proposes a research plan that can ensure the simultaneous improvement of cooling properties and avoid antioxidant properties under the joint action of auxiliary base oil and antioxidant, so that the overall performance reaches a balanced and good state during use.

[0117] Although the present invention has been described in considerable detail and with particularity with respect to several embodiments, it is not intended to limit the present invention to any of these details or embodiments or any particular embodiment, so as to effectively encompass the intended scope of the present invention. In addition, the present invention has been described above with respect to embodiments foreseen by the inventors for the purpose of providing a useful description, and those insubstantial modifications of the present invention that are not currently foreseen may still represent equivalent modifications of the present invention.

Claims

1. A metalworking gear shaving oil, characterized in that: By mass percentage, it contains the following ingredients: Composite base oil 80%-90%; Extreme pressure anti-wear agent 8%-18%; Antioxidant 1.0%-2.0%; Rust inhibitor 0.02%-0.05%; Defoaming agent 0.01%-0.03%; The composite base oil comprises base oil 150N and coal-based 3# base oil in a mass ratio of (52-54):(30-32); The kinematic viscosity of the composite base oil at 40°C is 20 mm 2 / s-21mm 2 / s; The kinematic viscosity of the composite base oil at 100°C is 4.3 mm 2 / s-4.4mm 2 / s.

2. A metalworking gear shaving oil according to claim 1, characterized in that: The extreme pressure anti-wear agent includes a first extreme pressure anti-wear agent and a second extreme pressure anti-wear agent; In terms of mass percentage, the content of the first extreme pressure anti-wear agent in the metalworking shaving oil is 2%-7%; Measured in percentage by mass, the content of the second extreme pressure anti-wear agent in the metalworking gear shaving oil is 6%-11%.

3. A metalworking gear shaving oil according to claim 2, characterized in that: The first extreme pressure anti-wear agent is extreme pressure anti-wear agent sulfurized fatty acid ester 2050; the second extreme pressure anti-wear agent is extreme pressure anti-wear agent sulfurized fatty acid ester 3026.

4. A metalworking gear shaving oil according to claim 1, characterized in that: The rust inhibitor comprises super-overbased synthetic calcium sulfonate, and the total base number of the super-overbased synthetic calcium sulfonate is not less than 385 mg KOH / g.

5. A metalworking gear shaving oil according to claim 4, characterized in that: The super-high base synthetic calcium sulfonate is rust inhibitor T106D.

6. A metalworking gear shaving oil according to claim 1, characterized in that: The defoamer is composite defoamer T921.

7. The metalworking gear shaving oil according to claim 1, characterized in that: The antioxidants include phenolic antioxidants and amine antioxidants; In terms of mass percentage, the content of the phenolic antioxidant in the metalworking shaving oil is 0.5%-1%; In terms of mass percentage, the content of the amine antioxidant in the metalworking shaving oil is 0.5%-1%.

8. A metalworking gear shaving oil according to claim 7, characterized in that: The phenolic antioxidant is antioxidant T551, and the amine antioxidant is antioxidant L57; In terms of weight ratio, in the metalworking shaving oil, the content ratio of the phenolic antioxidant T551 to the amine antioxidant L57 is 1:

1.

9. A metalworking gear shaving oil according to any one of claims 1 to 8, characterized in that: By mass percentage, it contains the following ingredients: Base oil 150N 53%; Coal-based 3# base oil 30.95%; Extreme pressure anti-wear agent sulfurized fatty acid ester 2050 5%; Extreme pressure anti-wear agent sulfurized fatty acid ester 3026 10%; Antioxidant T551 0.5%; Antioxidant L57 0.5%; Rust inhibitor T106D 0.02%; Defoaming agent T921 0.03%.

10. A method for preparing metalworking gear shaving oil according to any one of claims 1 to 9, characterized in that: The following steps are involved: The base oil 150N and the coal-based 3# base oil are mixed and stirred at 50°C-55°C, and the temperature is maintained throughout the process. After the extreme pressure anti-wear agent is added and stirred, the antioxidant, the rust inhibitor and the defoaming agent are added and stirred until uniform to obtain the metalworking shaving oil.

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