A high-efficiency oil removal method

Abstract

The application discloses a kind of efficient oil removal method, specifically related to metal oil removal technical field, including the following specific steps: step one, grinding processing: using oil mill to powder metallurgy product surface is handled;Step two, wet brushing: using clean brush to powder metallurgy product surface is washed, and in the process of washing, constantly spray alkaline cleaning agent on powder metallurgy product;Step three, rough washing: after wet brushing, powder metallurgy product is immersed in clean water, is filtered, removes water surface surface layer impurity and oil stain, then powder metallurgy product is fished out.The application is by using the weak alkaline nature of alkaline cleaning agent itself, not only can wash the oil stain on the surface of product, but also can make product surface bright and beautiful without yellow spot, using oscillator drives oil removal agent constantly vibration, reach the effect of stirring oil removal agent, so that oil removal agent can fully wash the oil stain remaining on the surface of product, and then can avoid black spot in subsequent annealing process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal oil removal, and particularly relates to a high-efficiency oil removal method. BACKGROUND

[0002] Powder metallurgy product processing includes PM powder metallurgy restriction forming and mim powder metallurgy injection forming. The parts of PM powder metallurgy restriction forming need to be cleaned on the surface of the parts, and many cleaning methods are also adopted in the powder metallurgy industry at present, but some problems are always encountered in the cleaning process.

[0003] With the continuous development of the powder metallurgy industry, for the welding product, the traditional process is water-based cleaning agent oil removal + high-temperature degreasing, due to the improper selection of the cleaning agent and the unreasonable setting of the degreasing temperature, the product contains a large amount of oil, which cannot be volatilized in time during tempering and is left on the surface of the product to form carbon ash, causing a large number of black spots, thereby affecting the subsequent welding performance of the product.

[0004] Therefore, it is necessary to invent a high-efficiency oil removal method to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a high-efficiency oil removal method, by utilizing the weak alkaline property of the alkaline cleaning agent itself, not only the oil stains on the surface of the product can be washed away, but also the surface of the product can be bright and yellow spot-free, by using the oscillator to drive the oil removal agent to vibrate constantly, the effect of stirring the oil removal agent is achieved, so that the oil removal agent can fully wash away the oil stains left on the surface of the product, the product is finally cleaned by using the organic cleaning solvent, the oil stains left on the surface of the product are dissolved by using the organic cleaning solvent, so as to ensure that there is no grease on the product, thereby avoiding the generation of black spots in the subsequent annealing process.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: a high-efficiency oil removal method, comprising the following specific steps:

[0007] Step one, grinding processing: the surface of the powder metallurgy product is processed by using an oil grinder;

[0008] Step two, wet brushing: the surface of the powder metallurgy product is brushed by using a cleaning brush, and the alkaline cleaning agent is continuously sprayed on the powder metallurgy product during the brushing process;

[0009] Step three, rough cleaning: the powder metallurgy product after wet brushing is immersed in clean water, filtered, and the surface impurities and oil stains are removed, and then the powder metallurgy product is taken out;

[0010] Step four, oscillation washing: put the powder metallurgy product out of the water tank, and add oil removing agent into the water tank, so that the powder metallurgy product is immersed in the oil removing agent for 30-40 minutes, and then the water tank is oscillated for 3-10 seconds by using the oscillator;

[0011] Step five, non-water-based cleaning: put the powder metallurgy product oscillated in step four into the ultrasonic cleaning equipment, and add organic cleaning solvent into the ultrasonic cleaning equipment for cleaning, and then perform vacuum drying after the cleaning is completed, so as to fully ensure that there is no oil and water on the product;

[0012] Step six, annealing: set the temperature of the dewaxing area to 550-610℃, put the powder metallurgy product into the dewaxing area for heating, and then take out the product after constant temperature keeping for 30-40 minutes and cooling.

[0013] Preferably, the raw materials used in the alkaline cleaning agent in step two include, by weight percentage, 10-20% of sodium hydroxide, 17-20% of sodium carbonate, 17-20% of sodium pyrophosphate, 17-20% of sodium tripolyphosphate, 10-14% of potassium phosphate, 3-7% of aluminum sulfate hydrate, 3-7% of polyethylene glycol alkyl phenyl ester, 2-5% of emulsifier, and 1-3% of metal chelating agent.

[0014] Preferably, the emulsifier is one of octylphenol polyoxyethylene ether, triethanolamine oleic acid soap, and dodecyl diethanol amide.

[0015] Preferably, the metal chelating agent is ethylenediaminetetraacetic acid or citric acid.

[0016] Preferably, the operation of preparing the alkaline cleaning agent in step two is as follows

[0017] S1, according to the proportion, the raw materials: sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester, emulsifier, and metal chelating agent are weighed;

[0018] S2, the weighed sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, and polyethylene glycol alkyl phenyl ester are first put into the stirring equipment for mixing, and then the emulsifier and the metal chelating agent are sequentially added to the inside, and the stirring is continued until the mixture is fully mixed, and the alkaline cleaning agent finished product is obtained.

[0019] Preferably, the raw materials used in the oil removing agent in step four include, by weight percentage, 5-10% of sodium phosphate, 2-3% of sodium dihydrogen phosphate, 5-6% of sodium silicate, 0.5-1% of sodium alkyl benzene sulfonate, and the balance is water.

[0020] Preferably, the specific steps of preparing the oil removing agent in step four are as follows:

[0021] H1, according to the proportion of raw materials: sodium phosphate, sodium dihydrogen phosphate, sodium silicate, sodium alkyl benzene sulfonate, water;

[0022] H2, first to the reaction kettle is added to water, then in turn sodium phosphate, sodium dihydrogen phosphate, sodium silicate, sodium alkyl benzene sulfonate, then join the stirring, until completely dissolved, then continue to stir for 30-50 minutes, namely the oil removal agent.

[0023] Preferably, the organic solvent used in step five is one of xylene, ethanol, carbon tetrachloride, trichloroethylene, tetrachloroethylene, trifluorotrichloroethane.

[0024] In the above technical solution, the technical effects and advantages provided by the present application are:

[0025] 1、The present application uses oil grinding instead of water-based grinding in the traditional process during the grinding process, solves the problem that the end face pores of the powder metallurgy product are opened after grinding, and the impurities are easily absorbed during water-based grinding, and the impurities are easily volatile and can be easily cleaned after the change to oil grinding.

[0026] 2、By utilizing the weak alkaline nature of the alkaline cleaning agent, not only can the oil stains on the surface of the product be washed away, but also the surface of the product can be bright and yellow-free, and under the brushing action of the cleaning brush, the corners of the product can also be cleaned to maximize the cleanliness of the product.

[0027] 3、By using the oscillator to drive the oil removal agent to vibrate constantly, the effect of stirring the oil removal agent is achieved, so that the oil removal agent can fully wash off the oil stains remaining on the surface of the product.

[0028] 4、By using the organic cleaning solvent to clean the product in the last step, the oil stains remaining on the surface of the product are dissolved by the organic cleaning solvent to ensure that there is no grease on the product, thereby avoiding the generation of black spots in the subsequent annealing process. DETAILED DESCRIPTION

[0029] In order to make the skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with specific examples.

[0030] Example 1

[0031] The present application provides a kind of efficient oil removal method, including the following specific steps:

[0032] Step one, grinding: using oil grinding to process the surface of powder metallurgy product;

[0033] Step two, wet brush: the surface of the powder metallurgy product is brushed with a cleaning brush, and the alkaline cleaning agent is continuously sprayed on the powder metallurgy product during brushing. The brushed product is moved to the bottom of the cleaning brush for cleaning by the net belt type conveying. In the present application, the alkaline cleaning agent can not only remove oil stains, but also make the product surface bright and without yellow spots.

[0034] The raw materials used in the alkaline cleaning agent used in this step include, by weight percentage, sodium hydroxide 10-20%, sodium carbonate 17-20%, sodium pyrophosphate 17-20%, sodium tripolyphosphate 17-20%, potassium phosphate 10-14%, aluminum sulfate hydrate 3-7%, polyethylene glycol alkyl phenyl ester 3-7%, emulsifier 2-5%, and metal chelating agent 1-3%.

[0035] The emulsifier is one of octylphenol polyoxyethylene ether, triethanolamine oleic acid soap, and dodecyl diethanol amide.

[0036] The metal chelating agent is ethylenediaminetetraacetic acid or citric acid.

[0037] In this embodiment, the raw materials include sodium hydroxide 19%, sodium carbonate 17%, sodium pyrophosphate 19%, sodium tripolyphosphate 19%, potassium phosphate 10%, aluminum sulfate hydrate 5%, polyethylene glycol alkyl phenyl ester 5%, octylphenol polyoxyethylene ether 5%, and citric acid 1%.

[0038] The specific preparation steps of the alkaline cleaning agent are as follows:

[0039] S1, according to the proportion, the raw materials: sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester, octylphenol polyoxyethylene ether, and citric acid are weighed;

[0040] S2, the weighed sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester are first put into the stirring equipment for mixing, then octylphenol polyoxyethylene ether and citric acid are added in turn, and the stirring is continued until the mixture is fully mixed, and the alkaline cleaning agent product is obtained.

[0041] Step three, rough washing: the powder metallurgy product after wet brushing is immersed in clean water, filtered to remove surface impurities and oil stains, and then the powder metallurgy product is fished out. This step can preliminarily filter out the oil stains washed off to prevent pollution of the powder metallurgy product;

[0042] Step four, swaying washing: the fished-out powder metallurgy product is put into a water tank, and an oil removal agent is added to the water tank so that the powder metallurgy product is immersed in the oil removal agent for 30 minutes, and then the water tank is oscillated by a vibrator for 3 seconds. The residual oil stains on the surface of the product can be better removed by oscillation.

[0043] The raw materials used in the oil removal agent used in this step include sodium phosphate 5-10%, sodium dihydrogen phosphate 2-3%, sodium silicate 5-6%, sodium alkyl benzene sulfonate 0.5-1%, and the balance is water;

[0044] Specifically in this embodiment, the oil removal agent includes sodium phosphate 5%, sodium dihydrogen phosphate 2%, sodium silicate 5%, sodium alkyl benzene sulfonate 0.5%, and water 87.5%;

[0045] The specific steps for making the oil removal agent are as follows:

[0046] H1, the raw materials are weighed according to the proportion: sodium phosphate, sodium dihydrogen phosphate, sodium silicate, sodium alkyl benzene sulfonate, and water;

[0047] H2, first add water to the reaction kettle, then add sodium phosphate, sodium dihydrogen phosphate, sodium silicate, and sodium alkyl benzene sulfonate in turn, and then add while stirring until completely dissolved, and then continue stirring for 30 minutes to obtain the oil removal agent.

[0048] Step five, non-water-based cleaning: the powder metallurgy product washed in step four is placed in an ultrasonic cleaning device, and an organic cleaning solvent is added to the ultrasonic cleaning device for cleaning, and after cleaning, vacuum drying is performed to fully ensure that there is no oil and moisture on the product;

[0049] The organic solvent used in this step is one of dimethylbenzene, ethanol, carbon tetrachloride, trichloroethylene, tetrachloroethylene, and trifluorotrichloroethane;

[0050] Specifically in this embodiment, the organic solvent used is dimethylbenzene, which can fully dissolve the oil and fat remaining on the surface of the powder metallurgy product, but dimethylbenzene has a certain volatility, and attention should be paid to safety when using.

[0051] Step six, annealing: the temperature of the dewaxing zone is set to 550℃, the powder metallurgy product is placed in the dewaxing zone for heating, and after constant temperature keeping for 30 minutes, the product is taken out and cooled. Compared with the previous dewaxing temperature of about 500℃, the temperature of the dewaxing zone is greatly improved by using the oil removal method provided by the present application, and the black spot defect rate is reduced.

[0052] Example 2

[0053] The present application provides an efficient oil removal method, which includes the following specific steps:

[0054] Step one, grinding: the surface of the powder metallurgy product is processed using an oil mill;

[0055] Step two, wet brush: the surface of the powder metallurgy product is brushed with a cleaning brush, and the alkaline cleaning agent is continuously sprayed on the powder metallurgy product during brushing. The brushed product is moved to the bottom of the cleaning brush by the net belt type transmission for cleaning. In the present application, the alkaline cleaning agent can not only remove oil stains, but also make the product surface bright and without yellow spots.

[0056] The raw materials used in the alkaline cleaning agent used in this step include, by weight percentage, sodium hydroxide 10-20%, sodium carbonate 17-20%, sodium pyrophosphate 17-20%, sodium tripolyphosphate 17-20%, potassium phosphate 10-14%, aluminum sulfate hydrate 3-7%, polyethylene glycol alkyl phenyl ester 3-7%, emulsifier 2-5%, and metal chelating agent 1-3%.

[0057] The emulsifier is one of octylphenol polyoxyethylene ether, triethanolamine oleic soap, and dodecyl diethanol amide.

[0058] The metal chelating agent is ethylenediaminetetraacetic acid or citric acid.

[0059] In this embodiment, the raw materials include sodium hydroxide 20%, sodium carbonate 19%, sodium pyrophosphate 17%, sodium tripolyphosphate 17%, potassium phosphate 14%, aluminum sulfate hydrate 3%, polyethylene glycol alkyl phenyl ester 3%, triethanolamine oleic soap 4%, and citric acid 3%.

[0060] The specific preparation steps of the alkaline cleaning agent are as follows:

[0061] S1, according to the proportion, the raw materials: sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester, triethanolamine oleic soap, and citric acid are weighed;

[0062] S2, the weighed sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester are first put into the stirring equipment for mixing, then triethanolamine oleic soap and citric acid are added in turn, and the stirring is continued until the mixture is fully mixed, and the alkaline cleaning agent product is obtained.

[0063] Step three, rough washing: the powder metallurgy product after wet brushing is immersed in clean water, filtered to remove surface impurities and oil stains, and then the powder metallurgy product is fished out. This step can preliminarily filter out the oil stains washed off to prevent pollution of the powder metallurgy product;

[0064] Step four, swaying washing: the fished-out powder metallurgy product is put into a water tank, and an oil removal agent is added to the water tank so that the powder metallurgy product is immersed in the oil removal agent for 35 minutes, and then the water tank is oscillated by a vibrator for 7 seconds. The oscillation can better remove the oil stains remaining on the surface of the product.

[0065] The raw materials used in the deoiling agent used in this step include sodium phosphate 5-10%, sodium dihydrogen phosphate 2-3%, sodium silicate 5-6%, sodium alkyl benzene sulfonate 0.5-1%, and the balance is water;

[0066] Specifically in this embodiment, the deoiling agent includes sodium phosphate 7%, sodium dihydrogen phosphate 2.5%, sodium silicate 5.5%, sodium alkyl benzene sulfonate 0.7%, and water 84.3%;

[0067] The specific steps for making the deoiling agent are as follows:

[0068] H1, the raw materials are weighed according to the proportion: sodium phosphate, sodium dihydrogen phosphate, sodium silicate, sodium alkyl benzene sulfonate, and water;

[0069] H2, first add water to the reaction kettle, then add sodium phosphate, sodium dihydrogen phosphate, sodium silicate, and sodium alkyl benzene sulfonate in turn, and then add while stirring until completely dissolved, and then continue stirring for 40 minutes to obtain the deoiling agent.

[0070] Step five, non-water-based cleaning: the powder metallurgy product washed in step four is placed in an ultrasonic cleaning device, and an organic cleaning solvent is added to the ultrasonic cleaning device for cleaning, and after the cleaning is completed, vacuum drying is performed to fully ensure that there is no oil and moisture on the product;

[0071] The organic solvent used in this step is one of dimethylbenzene, ethanol, carbon tetrachloride, trichloroethylene, tetrachloroethylene, and trifluorotrichloroethane;

[0072] Specifically in this embodiment, the organic solvent used is carbon tetrachloride, which can dissolve the oil and grease remaining on the surface of the powder metallurgy product, and carbon tetrachloride is harmful to human health, so safety needs to be paid attention to when using it.

[0073] Step six, annealing: the temperature of the dewaxing zone is set to 600°C, the powder metallurgy product is placed in the dewaxing zone for heating, and after constant temperature is maintained for 30 minutes, the product is taken out and cooled. Compared with the previous dewaxing temperature of about 500°C, the temperature of the dewaxing zone is greatly improved by using the deoiling method provided by the present application, and the black spot defect rate is reduced.

[0074] Example 3

[0075] The present application provides an efficient deoiling method, which includes the following specific steps:

[0076] Step one, grinding: the surface of the powder metallurgy product is processed using an oil mill;

[0077] Step two, wet brush: the surface of the powder metallurgy product is brushed with a cleaning brush, and the alkaline cleaning agent is continuously sprayed on the powder metallurgy product during brushing. The brushed product is moved to the bottom of the cleaning brush by the mesh belt conveyor for cleaning. In the present application, the alkaline cleaning agent can not only remove oil stains, but also make the product surface bright and without yellow spots;

[0078] The raw materials used in the alkaline cleaning agent used in this step include, by weight percentage, sodium hydroxide 10-20%, sodium carbonate 17-20%, sodium pyrophosphate 17-20%, sodium tripolyphosphate 17-20%, potassium phosphate 10-14%, aluminum sulfate hydrate 3-7%, polyethylene glycol alkyl phenyl ester 3-7%, emulsifier 2-5%, and metal chelating agent 1-3%.

[0079] The emulsifier is one of octylphenol polyoxyethylene ether, triethanolamine oleic soap, and dodecyl diethanol amide.

[0080] The metal chelating agent is ethylenediaminetetraacetic acid or citric acid.

[0081] In this embodiment, the raw materials include sodium hydroxide 10%, sodium carbonate 20%, sodium pyrophosphate 20%, sodium tripolyphosphate 20%, potassium phosphate 12%, aluminum sulfate hydrate 7%, polyethylene glycol alkyl phenyl ester 7%, dodecyl diethanol amide 2%, and ethylenediaminetetraacetic acid 2%.

[0082] The specific preparation steps of the alkaline cleaning agent are as follows:

[0083] S1, according to the proportion, the raw materials: sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester, dodecyl diethanol amide, and ethylenediaminetetraacetic acid are weighed;

[0084] S2, the weighed sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester are first put into the stirring equipment for mixing, then dodecyl diethanol amide and ethylenediaminetetraacetic acid are added in turn, and the stirring is continued until they are fully mixed to obtain the finished alkaline cleaning agent.

[0085] Step three, rough washing: the powder metallurgy product after wet brushing is immersed in clean water, filtered to remove surface impurities and oil stains, and then the powder metallurgy product is fished out. This step can preliminarily filter out the oil stains washed off to prevent pollution of the powder metallurgy product.

[0086] Step four, swaying washing: the fished-out powder metallurgy product is put into a water tank, and an oil removal agent is added to the water tank so that the powder metallurgy product is immersed in the oil removal agent for 40 minutes, and then the water tank is oscillated for 10 seconds by using an oscillator. The oil stains remaining on the surface of the product can be better removed by oscillation.

[0087] The degreasing agent used in this step comprises, by weight percentage, 5-10% sodium phosphate, 2-3% sodium dihydrogen phosphate, 5-6% sodium silicate, 0.5-1% sodium alkylbenzene sulfonate, and the remainder being water;

[0088] Specifically, in this embodiment, the degreasing agent comprises 10% sodium phosphate, 3% sodium dihydrogen phosphate, 6% sodium silicate, 1% sodium alkylbenzene sulfonate, and 80% water;

[0089] The specific steps for making a degreasing agent are as follows:

[0090] H1. Weigh the raw materials according to the following proportions: sodium phosphate, sodium dihydrogen phosphate, sodium silicate, sodium alkylbenzene sulfonate, and water;

[0091] H2. First, add water to the reaction vessel, then add sodium phosphate, sodium dihydrogen phosphate, sodium silicate, and sodium alkylbenzene sulfonate in sequence while stirring until completely dissolved. Then continue stirring for 50 minutes to obtain the degreasing agent.

[0092] Step 5, Non-aqueous cleaning: Place the powder metallurgy product rinsed in Step 4 into an ultrasonic cleaning device, add an organic cleaning solvent to the ultrasonic cleaning device for cleaning, and vacuum dry after cleaning to ensure that there is no oil or moisture on the product.

[0093] The organic solvent used in this step is one of xylene, ethanol, carbon tetrachloride, trichloroethylene, tetrachloroethylene, and trifluorotrichloroethane.

[0094] In this specific embodiment, the organic solvent used is ethanol. Ethanol is a colorless and transparent liquid with a special aroma and is volatile. Ethanol can dissolve the residual grease on the surface of powder metallurgy products.

[0095] Step 6, Annealing: Set the temperature of the dewaxing zone to 600℃, place the powder metallurgy product into the dewaxing zone and heat it. Maintain the constant temperature for 30 minutes, then take the product out and cool it. Compared with the previous dewaxing temperature of about 500℃, the degreasing method provided by this invention greatly increases the temperature of the dewaxing zone and reduces the black spot defect rate.

[0096] Example 4

[0097] The powder metallurgical products cleaned in the above three embodiments were selected, and the powder metallurgical products treated by the traditional method were selected as control examples. Then, the four cleaned powder metallurgical products were annealed respectively, and the black spots on the surface of the products after annealing were observed. After observation, the annealed products were welded with other workpieces, and the strength of the weld was tested by applying different tensile forces to pull the products and workpieces. The observation and test results are shown in the table below.

[0098]

[0099] From the statistical results in the above table, it can be seen that the powder metallurgy product cleaned by the method provided by the application has less oil stains remaining on the surface, and no obvious black spots are generated after annealing, and the welding quality of the product cleaned by the method provided by the application is improved.

[0100] The above only describes some exemplary embodiments of the application by way of illustration, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the application for those skilled in the art. Therefore, the above description is illustrative in nature and should not be construed as limiting the scope of protection of the claims of the application.

Claims

1. A highly efficient oil removal method, characterized by: The method comprises the following specific steps: Step one, grinding processing: using oil grinding to process the surface of the powder metallurgy product; Step two, wet brushing: using a cleaning brush to brush the surface of the powder metallurgy product, and continuously spraying alkaline cleaning agent on the powder metallurgy product during the brushing process; the alkaline cleaning agent used is prepared from the following raw materials in percentage by weight: 10-20% of sodium hydroxide, 17-20% of sodium carbonate, 17-20% of sodium pyrophosphate, 17-20% of sodium tripolyphosphate, 10-14% of potassium phosphate, 3-7% of aluminum sulfate hydrate, 3-7% of polyethylene glycol alkyl phenyl ester, 2-5% of emulsifier and 1-3% of metal chelating agent; Step three, rough cleaning: immersing the powder metallurgy product after wet brushing into clean water, filtering, removing the surface impurities and oil stains, and then taking out the powder metallurgy product; Step four, oscillation cleaning: immersing the powder metallurgy product taken out into a water tank, adding oil removal agent into the water tank, immersing the powder metallurgy product into the oil removal agent for 30-40 minutes, and then oscillating the water tank with an oscillator for 3-10 seconds; the oil removal agent used is prepared from the following raw materials in percentage by weight: 5-10% of sodium phosphate, 2-3% of sodium dihydrogen phosphate, 5-6% of sodium silicate, 0.5-1% of sodium alkyl benzene sulfonate and the balance of water; Step five, non-water-based cleaning: putting the powder metallurgy product after oscillation cleaning in step four into an ultrasonic cleaning device, adding organic cleaning solvent into the ultrasonic cleaning device, drying after cleaning, and fully ensuring that there is no oil and moisture on the product; Step six, annealing: setting the temperature of the dewaxing area to 550-610 DEG C, putting the powder metallurgy product into the dewaxing area, keeping the temperature constant for 30-40 minutes, and then taking out the product and cooling.

2. The efficient oil removal method according to claim 1, characterized in that: The emulsifier is one of octylphenol polyoxyethylene ether, triethanolamine oleic acid soap and dodecyl diethanol amide.

3. The efficient oil removal method according to claim 2, characterized in that: The metal chelating agent is ethylenediaminetetraacetic acid or citric acid.

4. The efficient oil removal method according to claim 3, characterized in that: The operation of preparing the alkaline cleaning agent in step two is as follows: S1, according to the proportion, the raw materials are weighed: sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester, emulsifier and metal chelating agent; S2, the weighed sodium hydroxide, sodium carbonate, sodium pyrophosphate, sodium tripolyphosphate, potassium phosphate, aluminum sulfate hydrate, polyethylene glycol alkyl phenyl ester are first put into a stirring device for mixing, then the emulsifier and the metal chelating agent are sequentially added, and the stirring is continued until the mixture is fully mixed, and the alkaline cleaning agent product is obtained.

5. The efficient oil removal method according to claim 1, characterized in that: The specific steps of preparing the oil removal agent in step four are as follows: H1, according to the proportion, the raw materials are weighed: sodium phosphate, sodium dihydrogen phosphate, sodium silicate, sodium alkyl benzene sulfonate and water; H2, first, water is added to the reaction kettle, then sodium phosphate, sodium dihydrogen phosphate, sodium silicate and sodium alkyl benzene sulfonate are sequentially added, and then stirring is carried out until complete dissolution, and then stirring is continued for 30-50 minutes, and the oil removal agent is obtained.

6. The efficient oil removal method according to claim 1, characterized in that: The organic solvent used in step five is one of dimethylbenzene, ethanol, carbon tetrachloride, trichloroethylene, tetrachloroethylene and trifluorotrichloroethane.

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