Cleaning method for automobile gear parts

Abstract

The invention discloses a cleaning method for automobile gear parts. The cleaning method comprises the steps that S1, the automobile gear parts are placed in a first tank containing a reagent 1 to be cleaned; s2, the part is transferred into a second tank containing a reagent 2 to be cleaned; s3, the parts are transferred into a third tank containing water to be cleaned; s4, the part is transferred into a fourth tank containing a hydrocarbon water cutting agent to be soaked; s5, the part is transferred into a fifth tank containing a hydrocarbon cleaning agent B to be cleaned; s6, the part is transferred into a sixth groove containing a hydrocarbon cleaning agent B to be cleaned; s7, the parts are transferred into a seventh tank to be subjected to vacuum steam cleaning; the reagent 1 is composed of a semi-water-based cleaning agent A and water in a mass ratio of (48-52): (48-52); the reagent 2 is composed of a semi-water-based cleaning agent A and water in a mass ratio of (5-10): (90-95); according to the method, efficient cleaning is achieved by improving the formula of a semi-water-based cleaning agent A and adopting a multi-stage cleaning process, and the appearance white spot reject ratio of gear products is controlled to be lower than 1%.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile transmission parts cleaning, and in particular relates to a method for cleaning automobile gear parts. Background Art

[0002] In the manufacturing process of automotive transmission parts, the processing of gear parts involves multiple complex processes, including but not limited to precision turning, gear hobbing, edge milling, spline rubbing, drilling, heat treatment and gear grinding; these processes not only increase the complexity of dirt on the surface of the parts, but also make the cleaning process particularly difficult. Traditionally, the cleaning of such parts mainly relies on water-based cleaning agents or halogenated hydrocarbon solvents.

[0003] The traditional water-based cleaning process usually includes two ultrasonic degreasing tanks and four tap water rinsing tanks, and finally hot air drying to complete the cleaning. Although this method can effectively remove most dirt, it has several significant problems: first, the first and second degreasing tanks are easily contaminated and the liquid needs to be changed frequently; second, the foam generated after ultrasonic cleaning is difficult to handle, and the cleaned parts are prone to rust; finally, the large amount of water used leads to high sewage treatment costs.

[0004] Halogenated hydrocarbon cleaning agents represented by trichloroethylene and their mixtures have strong decontamination ability and can effectively remove the dirt left over from processing. However, this cleaning method also has its limitations. For example, in the trichloroethylene cleaning process, the liquid in the first tank will be quickly contaminated and needs to be replaced every 2-5 days; in addition, trichloroethylene has high volatility and potential harm to human health, and operators must wear appropriate protective equipment; more importantly, although trichloroethylene can clean effectively, in some cases it will cause "white spots" on the surface of the product. This is due to the insufficient solubility of the cleaning agent for water-based dirt, which affects product quality and may cause subsequent rust.

[0005] Therefore, a cleaning method for automobile gear parts is urgently needed to solve the shortcomings of the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a method for cleaning automotive gear parts, which achieves stable and efficient cleaning by improving the formula of semi-aqueous cleaning agent A and adopting a multi-stage cleaning process, and controls the white spot defect rate of the gear products after cleaning to less than 1%.

[0007] To achieve the above purpose, the present invention provides a method for cleaning automotive gear parts, the steps comprising:

[0008] S1, placing the automotive gear parts to be cleaned in a first tank containing reagent 1 and performing heated ultrasonic cleaning;

[0009] S2, transferring the parts treated in step S1 to a second tank containing reagent 2 and performing heated ultrasonic cleaning;

[0010] S3, transferring the parts processed in step S2 to a third tank containing water and performing ultrasonic cleaning;

[0011] S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and immersing them;

[0012] S5, transferring the parts treated in step S4 to a fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning;

[0013] S6, transferring the parts processed in step S5 to a sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning;

[0014] S7, transferring the parts processed in step S6 to the seventh tank for vacuum steam cleaning and vacuum drying;

[0015] Wherein, reagent 1 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 48-52:48-52;

[0016] Reagent 2 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 5-10:90-95;

[0017] The semi-aqueous cleaning agent A comprises, by weight, 20 to 40 parts of hydrocarbon solvent, 5 to 15 parts of ethylenediamine polyoxyethylene polyoxypropylene ether, 7 to 12 parts of polypropylene glycol, 5 to 15 parts of allyl alcohol polyoxyalkyl ether, 0.5 to 1 part of tributyl phosphate, 7 to 12 parts of solubilizer, 1 to 3 parts of benzotriazole, and 30 to 50 parts of water.

[0018] Compared with the prior art, the present invention achieves stable and efficient cleaning by improving the formula of semi-aqueous cleaning agent A and adopting a multi-stage cleaning process, and controls the white spot defect rate of the gear products after cleaning to less than 1%. The specific improvements are as follows:

[0019] 1. The ethylenediamine polyoxyethylene polyoxypropylene ether and allyl alcohol polyoxyalkyl ether in the semi-aqueous cleaning agent A of the present application are both low-foam non-ionic surfactants, which can wet and peel off the oil stains on the surface of parts and emulsify them into fine droplets. However, the dispersion effect of the two is limited, and these oil droplets may re-aggregate or re-adsorb to the surface of parts; based on this, the present application also introduces polypropylene glycol, which has good dispersion properties. It can form a protective film around the emulsified oil droplets to prevent the mutual aggregation of oil droplets, thereby maintaining the dispersed state of the oil droplets; and the long chain structure of polypropylene glycol can physically prevent the oil droplets from re-attaching to the surface of the cleaned workpiece. At the same time, hydrocarbon solvents are used as the main raw materials. According to the principle of similar dissolving, hydrocarbon solvents can completely dissolve the stripped oil stains. In addition, tributyl phosphate is used as a defoamer and corrosion inhibitor to reduce the foam generated during the cleaning process and provide rust protection for the metal surface; benzotriazole quickly forms a passivation film on the clean surface after cleaning, further enhancing the rust prevention effect. Therefore, a synergistic effect is formed between the components in the semi-aqueous cleaning agent A of the present application, ensuring that the oil stains are completely dissolved, peeled off and dispersed, and preventing them from being re-adsorbed onto the workpiece surface, which helps to achieve a stable and high-quality cleaning effect.

[0020] 2. In S1 and S2 of the present invention, reagent 1 and reagent 2 containing different proportions of semi-aqueous cleaning agent A are used for two heated ultrasonic cleanings; this utilizes the strong dissolving ability of semi-aqueous cleaning agent A and the cavitation effect of ultrasound to quickly peel off and dissolve most of the oil and other pollutants, laying the foundation for subsequent steps. In S3, clean water is used for ultrasonic cleaning to remove residual cleaning agent and other soluble impurities to ensure that no residue affects subsequent processes. In S4, hydrocarbon water-cutting agent is used for immersion to efficiently remove moisture to prevent the formation of white spots or corrosion due to residual moisture in subsequent processes. S5 and S6 use hydrocarbon cleaning agent B for heated vacuum ultrasonic cleaning; in a high vacuum environment, combined with the mechanical vibration of ultrasound, tiny particles and stubborn stains can be removed more thoroughly, while reducing bubble interference and improving cleaning efficiency. In S7, the final cleaning and drying are carried out under high vacuum to ensure that there is no residue and avoid white spots or rust problems caused by residual substances.

[0021] Furthermore, the hydrocarbon solvent in the semi-aqueous cleaning agent A of the present invention may specifically be, but is not limited to, C 10 H 22 n-Alkane, C8H 18 n-Alkane, C9H 20 normal alkane; the solubilizer is an alcohol or alcohol ether solubilizer, specifically but not limited to propylene glycol, isopropanol, ethylene glycol butyl ether or diethylene glycol butyl ether.

[0022] Further, in step S1 of the present invention, the heating temperature is 45-50°C; the power of the ultrasonic wave is 2300-2500W, the frequency is 25-30kHz, and the time is 3-8min. For example, the heating temperature may be, but not limited to, 45°C, 46°C, 47°C, 48°C, 49°C, and 50°C; the power of the ultrasonic wave may be, but not limited to, 2300W, 2350W, 2400W, 2450W, and 2500W; the frequency may be, but not limited to, 25kHz, 28kHz, and 30kHz; the time may be, but not limited to, 3min, 5min, 6min, 7min, and 8min. Preferably, the temperature is 45°C; the ultrasonic wave power is 2400W; the frequency is 28kHz; and the cleaning time is 5min. More specifically, S1 uses an up-and-down tossing method to clean during the cleaning process to enhance the cleaning effect. After cleaning, the cleaning basket is lifted by the robotic arm and the residual liquid is further removed by cold wind during the draining process to ensure that the surface of the parts is dry and clean.

[0023] Further, in step S2 of the present invention, the heating temperature is 39-42°C; the power of the ultrasonic wave is 2300-2500W, the frequency is 40-45kHz, and the time is 3-8min. For example, the heating temperature may be, but not limited to, 39°C, 40°C, 41°C, and 42°C; the power of the ultrasonic wave may be, but not limited to, 2300W, 2350W, 2400W, 2450W, and 2500W; the frequency may be, but not limited to, 40kHz, 42kHz, and 45kHz; the time may be, but not limited to, 3min, 5min, 6min, 7min, and 8min. Preferably, the temperature is 40°C; the ultrasonic wave power is 2400W; the frequency is 40kHz; and the cleaning time is 5min. More specifically, S2 uses an up-and-down tossing method to clean during the cleaning process to enhance the cleaning effect. After cleaning, the cleaning basket is lifted by the robotic arm and the residual liquid is further removed by cold wind shearing during the draining process to ensure that the surface of the parts is dry and clean.

[0024] Furthermore, in step S3, the power of the ultrasonic wave is 2300-2500W, the frequency is 40-45kHz, the time is 3-8min, and the temperature is room temperature. The power of the ultrasonic wave may be, but is not limited to, 2300W, 2350W, 2400W, 2450W, 2500W; the frequency may be, but is not limited to, 40kHz, 42kHz, 45kHz; the time may be, but is not limited to, 3min, 5min, 6min, 7min, 8min. Preferably, the ultrasonic wave power is 2400W; the frequency is 40kHz; and the cleaning time is 5min. More specifically, S3 uses an up and down tossing method to enhance the cleaning effect during the cleaning process. After cleaning, the cleaning basket is lifted by the robotic arm and the residual liquid is further removed by cold air shearing during the draining process to ensure that the surface of the parts is dry and clean.

[0025] Furthermore, the soaking treatment time in step S4 is 3 to 8 minutes. For example, the soaking treatment time may be, but is not limited to, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, and 8 minutes. Preferably, the soaking treatment time is 5 minutes. Specifically, the hydrocarbon water-cutting agent accelerates the separation of surface moisture in hydrocarbons, has dehydration properties, and prevents water from being brought into the hydrocarbon cleaning agent B in S4; the hydrocarbon water-cutting agent can be purchased commercially, such as the hydrocarbon water-cutting agent produced by Guangdong Xinqiu Cleaning Technology Co., Ltd. More specifically, after the soaking treatment of S4 is completed, the cleaning basket is lifted by a robotic arm and the residual liquid is further removed by cold air shearing during the draining process to ensure that the surface of the parts is dry and clean.

[0026] Further, in step S5 and step S6, the hydrocarbon cleaning agent B is a C8-C10 normal alkane or isoalkane, and the flash point of the hydrocarbon cleaning agent B is 50° C., and the distillation range is 150-200° C. More specifically, the hydrocarbon cleaning agent B has an alkane content of 99%, an additive content of 1%, and a density of 0.76 g / ml.

[0027] Further, the vacuum degree in step S5 and step S6 is -70 to -90 KPa; the heating temperature is 39 to 42°C; the ultrasonic power is 2300 to 2500 W, the frequency is 40 to 45 kHz, and the time is 3 to 8 min. For example, the vacuum degree may be, but not limited to, -70 KPa, -75 KPa, -80 KPa, -85 KPa, and -90 KPa; the heating temperature may be, but not limited to, 39°C, 40°C, 41°C, and 42°C; the ultrasonic power may be, but not limited to, 2300 W, 2400 W, 2450 W, and 2500 W; the frequency may be, but not limited to, 40 kHz, 41 kHz, 42 kHz, 43 kHz, 44 kHz, and 45 kHz; and the time may be, but not limited to, 3 min, 4 min, 5 min, 6 min, 7 min, and 8 min. Preferably, the vacuum degree of the vacuum in step S5 is -80Kpa; the heating temperature is 40°C; the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min; the vacuum degree of the vacuum in step S6 is -80Kpa; the heating temperature is 40°C; the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min.

[0028] Furthermore, it also includes an online recovery system, which includes a distillation kettle, which is connected to the fifth tank and the seventh tank respectively. The hydrocarbon cleaning agent B in the fifth tank enters the distillation kettle after filtration and is heated to form steam. The steam enters the seventh tank for vacuum steam cleaning.

[0029] Furthermore, the vacuum degree of vacuum steam cleaning is -70 to -90 Kpa, and the cleaning time is 2 to 3 minutes; the relative vacuum degree of vacuum drying exceeds -99.5 Kpa, and the time is 3 to 8 minutes. For example, the vacuum degree of vacuum steam cleaning can be but not limited to -70 Kpa, -75 Kpa, -80 Kpa, -85 Kpa, -90 Kpa, and the cleaning time can be but not limited to 2 minutes, 2.5 minutes, and 3 minutes; the vacuum degree of vacuum drying can be -100 Kpa, and the time is 3 minutes, 4 minutes, 6 minutes, and 8 minutes.

[0030] Furthermore, the online recovery system also includes a liquid storage tank, which is connected to the distillation kettle and the sixth tank respectively. The hydrocarbon cleaning agent B in the fifth tank is filtered and enters the distillation kettle, and is heated to form steam. The steam is then condensed to form liquid and enters the liquid storage tank. The liquid storage tank automatically replenishes the sixth tank and the fifth tank in turn. During the hydrocarbon cleaning process, the fifth tank is the part that is most susceptible to contamination. In order to maintain the cleaning quality, after the equipment is started, the hydrocarbon cleaning agent B in the fifth tank will be continuously extracted to the distillation kettle for purification by a pump; the purified steam has two uses: one is to pass into the seventh tank as a medium for vacuum steam cleaning; the other is to directly condense and recover the steam when it is not needed, and then turn it into liquid and store it in the liquid storage tank again. In addition, the liquid storage tank is equipped with an induction switch, which triggers the action of replenishing liquid to the sixth tank when the liquid level reaches the preset height; and when the liquid level in the sixth tank also exceeds the set value, it will further replenish liquid to the fifth tank. In this way, the online recovery system realizes a continuous distillation regeneration process from the fifth tank to the sixth tank, ensuring that the hydrocarbon cleaning agent B in the sixth tank is always in the best cleaning state, thereby effectively solving the problem of white spots that may occur after cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a process flow chart of the cleaning method for automobile gear parts. DETAILED DESCRIPTION

[0032] In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with the embodiments and drawings. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0033] Please refer to Figure 1 The present invention provides a process flow chart of a cleaning method for automotive gear parts, the steps comprising:

[0034] S1, placing the automobile gear parts to be cleaned in the first tank 11 containing the reagent 1 and performing heated ultrasonic cleaning;

[0035] S2, transferring the parts treated in step S1 to the second tank 12 containing reagent 2 and performing heated ultrasonic cleaning;

[0036] S3, transferring the parts processed in step S2 to a third tank 13 containing water and performing ultrasonic cleaning;

[0037] S4, transferring the components treated in step S3 to a fourth tank 14 containing a hydrocarbon water-cutting agent and performing an immersion treatment;

[0038] S5, transferring the parts processed in step S4 to the fifth tank 15 containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning;

[0039] S6, transferring the parts processed in step S5 to the sixth tank 16 containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning;

[0040] S7, transferring the parts processed in step S6 to the seventh tank 17 for vacuum steam cleaning and vacuum drying;

[0041] Specifically, it also includes an online recovery system, which includes a distillation kettle 18, which is connected to the fifth tank 15 and the seventh tank 17 respectively. The hydrocarbon cleaning agent B in the fifth tank 15 enters the distillation kettle 18 after filtration and is heated to form steam. The steam enters the seventh tank 17 as a steam medium for vacuum steam cleaning.

[0042] Specifically, the online recovery system also includes a liquid storage tank 19, which is connected to the distillation kettle 18 and the sixth tank 16 respectively. The hydrocarbon cleaning agent B in the fifth tank 15 enters the distillation kettle 18 after filtration and is heated to form steam. The steam is then condensed to form liquid and enters the liquid storage tank 19. The liquid storage tank 19 automatically replenishes the sixth tank 16 and the fifth tank 15 in turn. During the hydrocarbon cleaning process, the fifth tank 15 is the part that is most susceptible to contamination. In order to maintain the cleaning quality, after the equipment is started, the hydrocarbon cleaning agent B in the fifth tank 15 will be continuously extracted to the distillation kettle 18 for purification by means of a pump; the purified steam has two uses: one is to pass into the seventh tank 17 as a medium for vacuum steam cleaning; the other is to directly condense and recover the steam when it is not needed, and then turn it into liquid and store it in the liquid storage tank 19 again. In addition, the liquid storage tank 19 is equipped with an induction switch, which triggers the action of replenishing liquid to the sixth tank 16 when the liquid level reaches a preset height; and when the liquid level of the sixth tank 16 also exceeds the set value, it will further replenish liquid to the fifth tank 15. In this way, the online recovery system realizes a continuous distillation regeneration process from the fifth tank 15 to the sixth tank 16, ensuring that the hydrocarbon cleaning agent B in the sixth tank 16 is always in the best cleaning state, thereby effectively solving the problem of white spots that may occur after cleaning.

[0043] Specifically, the first tank 11, the second tank 12, the third tank 13, the fourth tank 14, the fifth tank 15 and the sixth tank 16 all have separate circulation filtration systems; the filter element precisions of the first tank 11 and the second tank 12 are 20um and 10um respectively; the filter element precision of the third tank 13, the fourth tank 14, the fifth tank 15 and the sixth tank 16 is 5um; all filter elements need to be replaced regularly.

[0044] The objectives, technical solutions and beneficial effects of the present invention are described in more detail below through specific embodiments.

[0045] A total of 1,200 automotive gear parts from the same batch were selected to ensure that all workpieces had similar size, shape and surface characteristics; they were placed in anhydrous alcohol and cleaned with ultrasonic waves, and weighed after drying as M0, and then sprayed to dry the contaminants attached to the surface of each workpiece and weighed as M1. Subsequently, the batch of treated automotive gear parts was divided into 6 groups, each with 200 pieces, and each group was cleaned according to the cleaning methods in Examples 1 to 3 and Comparative Examples 1 to 3.

[0046] Example 1

[0047] This embodiment provides a method for cleaning automotive gear parts, the steps comprising:

[0048] S1, placing the automotive gear parts to be cleaned in the first tank containing reagent 1 and performing heated ultrasonic cleaning, wherein the heating temperature is 45°C, the ultrasonic power is 2400W, the frequency is 28kHz, and the time is 5min;

[0049] S2, transferring the parts treated in step S1 to the second tank containing reagent 2 and performing heated ultrasonic cleaning, wherein the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0050] S3, transferring the parts treated in step S2 to a third tank containing water and performing ultrasonic cleaning, wherein the ultrasonic power is 2400W, the frequency is 40kHz, the time is 5min, and the temperature is room temperature;

[0051] S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and immersing them for 5 minutes;

[0052] S5, transferring the parts treated in step S4 to the fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0053] S6, transferring the parts treated in step S5 to the sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0054] S7, transferring the parts treated in step S6 to the seventh tank, the hydrocarbon cleaning agent B in the fifth tank is filtered and then enters the distillation kettle, and then is heated to form steam, and the steam enters the seventh tank for vacuum steam cleaning; wherein the vacuum degree of vacuum steam cleaning is -80Kpa, and the cleaning time is 2min; the relative vacuum degree of vacuum drying is -100Kpa, and the time is 3min;

[0055] Wherein, reagent 1 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 50:50;

[0056] Reagent 2 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 5:95;

[0057] Semi-aqueous cleaning agent A, calculated by mass, includes 40 parts of C8H 18 n-alkane solvent, 5 parts of ethylenediamine polyoxyethylene polyoxypropylene ether, 10 parts of polypropylene glycol, 5 parts of allyl alcohol polyoxyalkyl ether, 1 part of tributyl phosphate, 8 parts of propylene glycol, 2 parts of benzotriazole, and 30 parts of water;

[0058] Hydrocarbon cleaning agent B is 99 parts by mass of C 10 H 22 n-alkane and 1 part by mass of an additive, wherein the additive is n-decanol.

[0059] Example 2

[0060] This embodiment provides a method for cleaning automotive gear parts, the steps comprising:

[0061] S1, placing the automotive gear parts to be cleaned in the first tank containing reagent 1 and performing heated ultrasonic cleaning, wherein the heating temperature is 46°C, the ultrasonic power is 2500W, the frequency is 30kHz, and the time is 5min;

[0062] S2, transferring the parts treated in step S1 to the second tank containing reagent 2 and performing heated ultrasonic cleaning, wherein the heating temperature is 42°C, the ultrasonic power is 2500W, the frequency is 43kHz, and the time is 8min;

[0063] S3, transferring the parts treated in step S2 to a third tank containing water and performing ultrasonic cleaning, wherein the ultrasonic power is 2300W, the frequency is 42kHz, the time is 3min, and the temperature is room temperature;

[0064] S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and soaking them for 5 minutes;

[0065] S5, transferring the parts treated in step S4 to the fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2500W, the frequency is 43kHz, and the time is 8min;

[0066] S6, transferring the parts treated in step S5 to the sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2300W, the frequency is 43kHz, and the time is 6min;

[0067] S7, transferring the parts treated in step S6 to the seventh tank, the hydrocarbon cleaning agent B in the fifth tank is filtered and then enters the distillation kettle, and then is heated to form steam, and the steam enters the seventh tank for vacuum steam cleaning; wherein the vacuum degree of vacuum steam cleaning is -80Kpa, and the cleaning time is 2min; the relative vacuum degree of vacuum drying is -100Kpa, and the time is 3min;

[0068] Wherein, reagent 1 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 50:50;

[0069] Reagent 2 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 5:95;

[0070] Semi-aqueous cleaning agent A, calculated by mass, includes 35 parts of C8H 18 n-alkane solvent, 10 parts of ethylenediamine polyoxyethylene polyoxypropylene ether, 7 parts of polypropylene glycol, 8 parts of allyl alcohol polyoxyalkyl ether, 0.7 parts of tributyl phosphate, 9 parts of ethylene glycol butyl ether, 3 parts of benzotriazole, 40 parts of water;

[0071] Hydrocarbon cleaning agent B is 99 parts by mass C 10 H 22 n-alkane and 1 part by mass of an additive, wherein the additive is n-decanol.

[0072] Example 3

[0073] This embodiment provides a method for cleaning automotive gear parts, the steps comprising:

[0074] S1. Place the automotive gear parts to be cleaned in the first tank containing reagent 1 and perform heated ultrasonic cleaning, wherein the heating temperature is 48° C., the ultrasonic power is 2300 W, the frequency is 25 kHz, and the time is 6 min;

[0075] S2, transferring the parts treated in step S1 to the second tank containing reagent 2 and performing heated ultrasonic cleaning, wherein the heating temperature is 39° C., the ultrasonic power is 2300 W, the frequency is 40 kHz, and the time is 4 min;

[0076] S3, transferring the parts treated in step S2 to a third tank containing water and performing ultrasonic cleaning, wherein the ultrasonic power is 2500W, the frequency is 40kHz, the time is 7min, and the temperature is room temperature;

[0077] S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and soaking them for 5 minutes;

[0078] S5, transferring the parts treated in step S4 to the fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2500W, the frequency is 40kHz, and the time is 4min;

[0079] S6, transferring the parts treated in step S5 to the sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2500W, the frequency is 45kHz, and the time is 5min;

[0080] S7, transferring the parts treated in step S6 to the seventh tank, the hydrocarbon cleaning agent B in the fifth tank is filtered and then enters the distillation kettle, and then is heated to form steam, and the steam enters the seventh tank for vacuum steam cleaning; wherein the vacuum degree of vacuum steam cleaning is -80Kpa, and the cleaning time is 3min; the relative vacuum degree of vacuum drying is -100Kpa, and the time is 3min;

[0081] Wherein, reagent 1 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 50:50;

[0082] Reagent 2 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 5:95;

[0083] Semi-aqueous cleaning agent A, calculated by mass, includes 25 parts of C8H 18 n-alkane solvent, 14 parts of ethylenediamine polyoxyethylene polyoxypropylene ether, 8 parts of polypropylene glycol, 12 parts of allyl alcohol polyoxyalkyl ether, 0.9 parts of tributyl phosphate, 11 parts of propylene glycol, 1.5 parts of benzotriazole, 50 parts of water;

[0084] Hydrocarbon cleaning agent B is 99 parts by mass C 10 H 22 n-alkane and 1 part by mass of an additive, wherein the additive is n-decanol.

[0085] Comparative Example 1

[0086] This comparative example provides a method for cleaning automotive gear parts, the steps comprising:

[0087] S1, placing the automotive gear parts to be cleaned in the first tank containing reagent 1 and performing heated ultrasonic cleaning, wherein the heating temperature is 45°C, the ultrasonic power is 2400W, the frequency is 28kHz, and the time is 5min;

[0088] S2, transferring the parts treated in step S1 to the second tank containing reagent 2 and performing heated ultrasonic cleaning, wherein the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0089] S3, transferring the parts treated in step S2 to a third tank containing water and performing ultrasonic cleaning, wherein the ultrasonic power is 2400W, the frequency is 40kHz, the time is 5min, and the temperature is room temperature;

[0090] S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and immersing them for 5 minutes;

[0091] S5, transferring the parts treated in step S4 to the fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0092] S6, transferring the parts treated in step S5 to the sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0093] S7, transferring the parts treated in step S6 to the seventh tank, the hydrocarbon cleaning agent B in the fifth tank is filtered and then enters the distillation kettle, and then is heated to form steam, and the steam enters the seventh tank for vacuum steam cleaning; wherein the vacuum degree of vacuum steam cleaning is -80Kpa, and the cleaning time is 2min; the relative vacuum degree of vacuum drying is -100Kpa, and the time is 3min;

[0094] Wherein, reagent 1 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 50:50;

[0095] Reagent 2 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 5:95;

[0096] Semi-aqueous cleaning agent A, calculated by mass, includes 40 parts of C8H 18 n-alkane solvent, 10 parts of polypropylene glycol, 5 parts of allyl alcohol polyoxyalkyl ether, 1 part of tributyl phosphate, 8 parts of propylene glycol, 2 parts of benzotriazole, 30 parts of water;

[0097] Hydrocarbon cleaning agent B is 99 parts by mass of C 10 H 22 n-alkane and 1 part by mass of an additive, wherein the additive is n-decanol.

[0098] Comparative Example 2

[0099] This comparative example provides a method for cleaning automotive gear parts, the steps comprising:

[0100] S1, placing the automotive gear parts to be cleaned in the first tank containing reagent 1 and performing heated ultrasonic cleaning, wherein the heating temperature is 45°C, the ultrasonic power is 2400W, the frequency is 28kHz, and the time is 5min;

[0101] S2, transferring the parts treated in step S1 to the second tank containing reagent 2 and performing heated ultrasonic cleaning, wherein the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0102] S3, transferring the parts treated in step S2 to a third tank containing water and performing ultrasonic cleaning, wherein the ultrasonic power is 2400W, the frequency is 40kHz, the time is 5min, and the temperature is room temperature;

[0103] S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and immersing them for 5 minutes;

[0104] S5, transferring the parts treated in step S4 to the fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0105] S6, transferring the parts treated in step S5 to the sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0106] S7, transferring the parts treated in step S6 to the seventh tank, the hydrocarbon cleaning agent B in the fifth tank is filtered and then enters the distillation kettle, and then is heated to form steam, and the steam enters the seventh tank for vacuum steam cleaning; wherein the vacuum degree of vacuum steam cleaning is -80Kpa, and the cleaning time is 2min; the relative vacuum degree of vacuum drying is -100Kpa, and the time is 3min;

[0107] Wherein, reagent 1 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 50:50;

[0108] Reagent 2 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 5:95;

[0109] Semi-aqueous cleaning agent A, calculated by mass, includes 40 parts of C8H 18 n-alkane solvent, 5 parts of ethylenediamine polyoxyethylene polyoxypropylene ether, 10 parts of polypropylene glycol, 1 part of tributyl phosphate, 8 parts of propylene glycol, 2 parts of benzotriazole, and 30 parts of water;

[0110] Hydrocarbon cleaning agent B is 99 parts by mass of C 10 H 22 n-alkane and 1 part by mass of an additive, wherein the additive is n-decanol.

[0111] Comparative Example 3

[0112] This comparative example provides a method for cleaning automotive gear parts, the steps comprising:

[0113] S1, placing the automotive gear parts to be cleaned in the first tank containing reagent 1 and performing heated ultrasonic cleaning, wherein the heating temperature is 45°C, the ultrasonic power is 2400W, the frequency is 28kHz, and the time is 5min;

[0114] S2, transferring the parts treated in step S1 to the second tank containing reagent 2 and performing heated ultrasonic cleaning, wherein the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0115] S3, transferring the parts treated in step S2 to a third tank containing water and performing ultrasonic cleaning, wherein the ultrasonic power is 2400W, the frequency is 40kHz, the time is 5min, and the temperature is room temperature;

[0116] S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and immersing them for 5 minutes;

[0117] S5, transferring the parts treated in step S4 to the fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0118] S6, transferring the parts treated in step S5 to the sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning, wherein the vacuum degree is -80Kpa, the heating temperature is 40°C, the ultrasonic power is 2400W, the frequency is 40kHz, and the time is 5min;

[0119] S7, transferring the parts treated in step S6 to the seventh tank, the hydrocarbon cleaning agent B in the fifth tank is filtered and then enters the distillation kettle, and then is heated to form steam, and the steam enters the seventh tank for vacuum steam cleaning; wherein the vacuum degree of vacuum steam cleaning is -80Kpa, and the cleaning time is 2min; the relative vacuum degree of vacuum drying is -100Kpa, and the time is 3min;

[0120] Wherein, reagent 1 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 50:50;

[0121] Reagent 2 is composed of semi-aqueous cleaning agent A and water in a mass ratio of 5:95;

[0122] Semi-aqueous cleaning agent A, calculated by mass, includes 40 parts of C8H 18 n-alkane solvent, 5 parts of ethylenediamine polyoxyethylene polyoxypropylene ether, 5 parts of allyl alcohol polyoxyalkyl ether, 1 part of tributyl phosphate, 8 parts of propylene glycol, 2 parts of benzotriazole, 30 parts of water;

[0123] Hydrocarbon cleaning agent B is 99 parts by mass C 10 H 22 n-alkane and 1 part by mass of an additive, wherein the additive is n-decanol.

[0124] The automotive gear parts cleaned by the cleaning methods in Examples 1 to 3 and Comparative Examples 1 to 3 were taken out and weighed as M2, i.e., cleaning rate = (M1-M2) / (M1-M0)×100%. At the same time, the automotive gear parts were observed under a 4x magnifying glass to see whether there was any white ash residue, the number of parts with white ash residue was counted, and the defective rate was calculated. The results are shown in Table 1.

[0125] Table 1 Cleaning rate and white ash residue test results

[0126]

[0127]

[0128] As can be seen from Table 1, the present application provides a method for cleaning automotive gear parts, which achieves stable and efficient cleaning by improving the formula of semi-aqueous cleaning agent A and adopting a multi-stage cleaning process, and controls the white spot defect rate of the gear products after cleaning to less than 1%.

[0129] By comparing Example 1 with Comparative Examples 1 to 3, it can be seen that removing any one of ethylenediamine polyoxyethylene polyoxypropylene ether, allyl alcohol polyoxyalkyl ether and polypropylene glycol will affect the cleaning rate and white spot defect rate. This is because ethylenediamine polyoxyethylene polyoxypropylene ether and allyl alcohol polyoxyalkyl ether are both low-foaming non-ionic surfactants, which can wet and peel off the oil stains on the surface of parts and emulsify them into tiny droplets; at the same time, polypropylene glycol has good dispersibility, it can form a protective film around the emulsified oil droplets to prevent the oil droplets from aggregating with each other, thereby maintaining the dispersed state of the oil droplets; and the long chain structure of polypropylene glycol can physically prevent the oil droplets from re-attaching to the cleaned workpiece surface.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for cleaning automotive gear parts, characterized in that: Steps include: S1, placing the automotive gear parts to be cleaned in a first tank containing reagent 1 and performing heated ultrasonic cleaning; S2, transferring the parts treated in step S1 to a second tank containing reagent 2 and performing heated ultrasonic cleaning; S3, transferring the parts processed in step S2 to a third tank containing water and performing ultrasonic cleaning; S4, transferring the parts treated in step S3 to a fourth tank containing a hydrocarbon water-cutting agent and immersing them; S5, transferring the parts processed in step S4 to a fifth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning; S6, transferring the parts processed in step S5 to a sixth tank containing hydrocarbon cleaning agent B and performing heated vacuum ultrasonic cleaning; S7, transferring the parts processed in step S6 to the seventh tank for vacuum steam cleaning and vacuum drying; Wherein, the reagent 1 is composed of a semi-aqueous cleaning agent A and water in a mass ratio of 48-52:48-52; The reagent 2 is composed of a semi-aqueous cleaning agent A and water in a mass ratio of 5-10:90-95; The semi-aqueous cleaning agent A comprises, by mass, 20 to 40 parts of hydrocarbon solvent, 5 to 15 parts of ethylenediamine polyoxyethylene polyoxypropylene ether, 7 to 12 parts of polypropylene glycol, 5 to 15 parts of allyl alcohol polyoxyalkyl ether, 0.5 to 1 part of tributyl phosphate, 7 to 12 parts of solubilizer, 1 to 3 parts of benzotriazole, and 30 to 50 parts of water.

2. A method for cleaning automotive gear parts as claimed in claim 1, characterized in that: The heating temperature in step S1 is 45-50° C.; the power of the ultrasonic wave is 2300-2500 W, the frequency is 25-30 kHz, and the time is 3-8 min.

3. A method for cleaning automotive gear parts as claimed in claim 1, characterized in that: The heating temperature in step S2 is 39-42° C.; the power of the ultrasonic wave is 2300-2500 W, the frequency is 40-45 kHz, and the time is 3-8 min.

4. A method for cleaning automotive gear parts as claimed in claim 1, characterized in that: The power of the ultrasonic wave in step S3 is 2300-2500W, the frequency is 40-45kHz, and the time is 3-8min.

5. A method for cleaning automotive gear parts as claimed in claim 1, characterized in that: The soaking treatment time in step S4 is 3 to 8 minutes.

6. A method for cleaning automotive gear parts as claimed in claim 1, characterized in that: The hydrocarbon cleaning agent B in step S5 and step S6 is a C8-C10 normal alkane or isoalkane, and the hydrocarbon cleaning agent B has a flash point of 50°C and a distillation range of 150-200°C.

7. A method for cleaning automotive gear parts as claimed in claim 1, characterized in that: The vacuum degree of the vacuum in step S5 and step S6 is -70 to -90 KPa; the heating temperature is 39 to 42° C.; the power of the ultrasonic wave is 2300 to 2500 W, the frequency is 40 to 45 kHz, and the time is 3 to 8 min.

8. A method for cleaning automotive gear parts as claimed in claim 1, characterized in that: It also includes an online recovery system, which includes a distillation kettle, which is connected to the fifth tank and the seventh tank respectively. The hydrocarbon cleaning agent B in the fifth tank enters the distillation kettle after filtration and is heated to form steam. The steam enters the seventh tank for vacuum steam cleaning.

9. A method for cleaning automotive gear parts as claimed in claim 8, characterized in that: The vacuum degree of the vacuum steam cleaning is -70 to -90 Kpa, and the cleaning time is 2 to 3 minutes; the relative vacuum degree of the vacuum drying exceeds -99.5 Kpa, and the time is 3 to 8 minutes.

10. A method for cleaning automotive gear parts as claimed in claim 8, characterized in that: The online recovery system also includes a liquid storage tank, which is connected to the distillation kettle and the sixth tank respectively. The hydrocarbon cleaning agent B in the fifth tank enters the distillation kettle after filtration and is heated to form steam. The steam is then condensed to form liquid and enters the liquid storage tank. The liquid storage tank automatically replenishes the sixth tank and the fifth tank in turn.

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