CN113801722A

CN113801722A - Special grinding fluid for ELID grinding of aluminum-based diamond composite material

Info

Publication number: CN113801722A
Application number: CN202110958460.5A
Authority: CN
Inventors: 关佳亮; 潘艳杰; 张振高; 代子鹏
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2021-12-17

Abstract

The invention discloses a special grinding fluid for precision machining ELID of an aluminum-based diamond composite material, which has improved electrolytic capability and can effectively electrolyze an aluminum matrix and an iron-based grinding wheel in aluminum-based diamond. Meanwhile, a compact oxide film can be formed on the surfaces of the grinding wheel and the metal, so that a machine tool, a workpiece and a cutter are prevented from being corroded. The grinding fluid has the advantages of high efficiency, low cost, high removal rate, good surface quality of a processed workpiece and high processing precision. Meanwhile, the grinding fluid is green and pollution-free, does no harm to human bodies and the environment, meets the requirements of precise and ultra-precise online electrolytic finishing mirror surface machining of workpieces, and is suitable for precise machining of aluminum-based diamond composite materials.

Description

Special grinding fluid for ELID grinding of aluminum-based diamond composite material

Technical Field

The invention relates to a special grinding fluid for ELID grinding, which is suitable for the field of precise and ultra-precise grinding of aluminum-based diamond composite materials.

Background

The aluminum-based diamond composite material is a newly developed fourth-generation electronic packaging material, compared with a third-generation electronic packaging material, aluminum-based silicon carbide, the material has the advantages of improved thermal conductivity, reduced thermal expansion coefficient and capability of effectively prolonging the service life and stability of an electronic device, but the huge difference between the hardness of a reinforcing phase and the hardness of a matrix causes that the traditional grinding wheel is easily blocked by aluminum-based abrasive dust to cause surface burn, and the precise processing of the aluminum-based diamond cannot be realized. At present, the preparation technology of the aluminum-based diamond composite material is mellow, but no scholars are involved in the research of the precise processing technology of the material, and the application of the aluminum-based diamond composite material is greatly limited.

In order to realize the precise processing of the aluminum-based diamond composite material, the adhesion effect of a soft aluminum matrix to a cutter and the phenomena of low material removal rate, generation of accumulated chip tumors, processing burn and more defects in the processing process must be solved in the processing technology, the ELID grinding can remove a metal bonding agent and aluminum matrix grinding chips adhered to the surface of a grinding wheel through on-line electrolysis, so that the grinding wheel realizes self-sharpening, keeps good cutting, chip removal and heat dissipation capabilities, and avoids the burn of the material. The acid-base property, the components, the proportion and the flow rate of the ELID grinding fluid directly influence the generation speed, the thickness, the uniformity, the compactness, the adhesiveness, the insulativity and the like of an oxide film on the grinding surface of the grinding wheel, and directly influence the quality of the grinding surface. Compared with the special grinding fluid for the ELID grinding composite material in the earlier stage, the grinding fluid has the advantages that the grinding fluid has higher electrolytic film forming capability for the aluminum-based diamond material, aluminum-based abrasive dust and a grinding wheel metal binder adhered to the surface of a grinding wheel can be electrolytically removed, a compact oxide film is generated on the grinding surface of the grinding wheel, and excessive electrolysis of the grinding wheel binder is inhibited by adjusting the proportion of the components of the grinding fluid in an experiment aiming at the characteristic that a diamond particle reinforced phase is harder and an aluminum matrix is softer in the processing of the aluminum-based diamond material. The grinding fluid also has strong antirust property, and can prevent a machine tool and a workpiece from being corroded.

Disclosure of Invention

The grinding fluid aims to solve the problems that when the existing grinding fluid is used for processing an aluminum-based diamond composite material, an aluminum-based matrix adhesion grinding wheel is seriously blocked, the processing removal rate is low, the surface quality of the processed aluminum-based diamond is poor, and the precision processing cannot be realized due to serious burn. The grinding fluid has improved electrolytic capacity, effectively electrolyzes the aluminum-based abrasive dust adhered to the surface of the grinding wheel and the metal binder in the grinding wheel, and simultaneously can form a compact oxide film on the surfaces of the grinding wheel and the metal to inhibit the excessive electrolysis of the grinding wheel binder and prevent a machine tool and a workpiece from being corroded. The grinding fluid has the advantages of high efficiency, low cost, high removal rate, good surface quality of a processed workpiece and high processing precision. Meanwhile, the grinding fluid is green and pollution-free, does no harm to human bodies and the environment, meets the requirements of precise and ultra-precise online electrolytic sharpening of workpieces, and is suitable for precise processing of aluminum-based diamond composite materials.

The special grinding fluid for the aluminum-based diamond composite ELID is characterized in that: the special grinding fluid comprises engine oil, soybean oil, sodium petroleum sulfonate, sodium benzoate, monoethanolamine benzoate, polyoxyethylene fatty acid ester, polyether ester, dimethyl silicone oil, molybdenum dioxide, chromium oleate, triethanolamine, methylbenzotriazole, benzisothiazolinone, oxalic acid, sodium orthosilicate, disodium hydrogen phosphate, naphthenate, tricresyl phosphate, sulfurized fatty acid ester, oleamide, lauric acid, sodium nitrate and water.

The weight percentage of each component is as follows: 1 to 2 percent of engine oil, 1.5 to 2 percent of soybean oil, 0.2 to 0.3 percent of sodium petroleum sulfonate, 0.1 to 0.2 percent of monoethanolamine benzoate, 0.1 to 0.2 percent of sodium benzoate, 0.8 to 1.5 percent of polyether ester, 1.5 to 2 percent of dimethyl silicone oil, 2 to 3 percent of molybdenum disulfide, 5 to 6 percent of polyoxyethylene fatty acid ester, 0.2 to 0.5 percent of chromium oleate, 0.2 to 0.5 percent of triethanolamine, 0.5 to 1 percent of benzisothiazolinone, 0.2 to 0.5 percent of methylbenzotriazole, 2 to 4 percent of oxalic acid, 0.2 to 0.3 percent of methyltrimethoxysilane, 0.2 to 0.3 percent of sodium orthosilicate, 0.2 to 0.3 percent of disodium hydrogen phosphate, 0.8 to 0.9 percent of naphthenate, 4 to 5 percent of trimethylbenzene phosphate, 3 to 6 percent of sulfurized fatty acid ester, 0.7 to 1 percent of sodium laurate, and 1 to 2 percent of sodium nitrate, 60 to 70 percent of water.

The special grinding fluid for the precision machining ELID of the aluminum-based diamond composite material and the preparation method thereof are characterized by comprising the following specific steps:

s1, adding petroleum sodium sulfonate, sodium benzoate, monoethanolamine benzoate, polyether ester, molybdenum disulfide, dimethyl silicone oil, polyoxyethylene fatty acid ester, naphthenate, tricresyl phosphate, sulfurized fatty acid ester, oleamide, triethanolamine and lauric acid into water with the total temperature of 1/3, and stirring and mixing for 40-50 min to obtain a mixture;

s2, adding sodium orthosilicate, disodium hydrogen phosphate, chromium oleate, triethanolamine and sodium nitrate into the mixture obtained in the step S1, and stirring for 25-30 min;

s3, taking 1/3 parts of water, heating to 70-80 ℃, adding the engine oil and the soybean oil, and stirring and mixing for 20-25 min;

s4, mixing the mixture obtained in the step S2 and the mixture obtained in the step S3, and stirring and mixing at 55-65 ℃ for 40-50 min;

s5, adding oxalic acid into the mixed solution obtained in the step S4, adding the rest 1/3 water, and stirring for 30-40 min to obtain the grinding fluid.

The invention has the advantages that:

the electrolytic dressing grinding wheel has strong electrolytic film forming capability, can electrolytically dress the grinding wheel binder and electrolytically remove aluminum-based abrasive dust attached to the surface of the grinding wheel, and simultaneously generates an oxide film on the grinding surface of the grinding wheel to inhibit the excessive electrolysis of the grinding wheel binder and lubricate the grinding surface;

the grinding fluid can improve the grinding performance of the grinding wheel, reduce grinding loss and improve the processing efficiency of the materials which are difficult to process such as aluminum-based diamond and the like;

the grinding fluid has no corrosiveness and pollution, and has good antirust, lubricating and cooling effects; the cleaning agent has high stability, is not easy to deteriorate in the air, has a high cleaning effect on a machine tool, a grinding tool and a workpiece, and improves the surface quality of the workpiece after grinding.

Drawings

FIG. 1ELID grinding composite material special grinding fluid processing sample.

FIG. 2 is a sample piece processed by special grinding fluid for ELID grinding of aluminum-based diamond.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1:

the following weight fractions: 2.5% of engine oil, 2% of soybean oil, 0.3% of sodium petroleum sulfonate, 0.1% of monoethanolamine benzoate, 0.2% of sodium benzoate, 1% of polyether ester, 1.8% of dimethyl silicone oil, 2.5% of molybdenum disulfide, 5.5% of polyoxyethylene fatty acid ester, 0.4% of chromium oleate, 0.3% of triethanolamine, 0.8% of benzisothiazolinone, 0.4% of methylbenzotriazole, 3% of oxalic acid, 0.3% of methyltrimethoxysilane, 0.3% of sodium orthosilicate, 0.3% of disodium hydrogen phosphate, 0.8% of naphthenate, 4.5% of tricresyl phosphate, 5% of sulfurized fatty acid ester, 0.8% of oleamide, 1.2% of lauric acid, 1% of sodium nitrate and 65% of water.

The preparation method of the special grinding fluid comprises the following specific steps:

adding petroleum sodium sulfonate, sodium benzoate, monoethanolamine benzoate, polyether ester, molybdenum disulfide, dimethyl silicone oil, polyoxyethylene fatty acid ester, naphthenate, tricresyl phosphate, sulfurized fatty acid ester, oleamide, triethanolamine and lauric acid into water with the total temperature of 1/3 at 45 ℃, and stirring and mixing for 45min to prepare a mixture; ② adding sodium orthosilicate, disodium hydrogen phosphate, chromium oleate, triethanolamine and sodium nitrate into the mixture obtained in the step S1 and stirring for 30 min;

thirdly, taking 1/3 parts of water, heating to 75 ℃, adding engine oil and soybean oil, stirring and mixing for 25 min;

mixing the mixture obtained in the step (2) with the mixture obtained in the step (S3), and stirring and mixing for 45min at 60 ℃;

fifthly, adding oxalic acid into the mixed solution obtained in the step 4, adding water, and stirring for 35min to obtain the grinding fluid.

Example 2:

the following weight fractions: 2% of engine oil, 1.5% of soybean oil, 0.2% of sodium petroleum sulfonate, 0.1% of monoethanolamine benzoate, 0.1% of sodium benzoate, 0.8% of polyether ester, 1.5% of dimethyl silicone oil, 2% of molybdenum disulfide, 5% of polyoxyethylene fatty acid ester, 0.2% of chromium oleate, 0.2% of triethanolamine, 0.5% of benzisothiazolinone, 0.2% of methylbenzotriazole, 2% of oxalic acid, 0.2% of methyltrimethoxysilane, 0.2% of sodium orthosilicate, 0.2% of disodium hydrogen phosphate, 0.8% of naphthenate, 4% of tricresyl phosphate, 3% of sulfurized fatty acid ester, 0.7% of oleamide, 1% of lauric acid, 0.8% of sodium nitrate and 60% of water.

adding petroleum sodium sulfonate, sodium benzoate, monoethanolamine benzoate, polyether ester, molybdenum disulfide, dimethyl silicone oil, polyoxyethylene fatty acid ester, naphthenate, tricresyl phosphate, sulfurized fatty acid ester, oleamide, triethanolamine and lauric acid into water with the total temperature of 1/2 at 40 ℃, and stirring and mixing for 40min to prepare a mixture; adding sodium orthosilicate, disodium hydrogen phosphate, chromium oleate, triethanolamine and sodium nitrate into the mixture obtained in the step 1, and stirring for 25 min;

③ taking 1/2 parts of water, heating to 70 ℃, adding machine oil and soybean oil, stirring and mixing for 20 min;

mixing the mixture obtained in the step (2) with the mixture obtained in the step (S3), and stirring and mixing for 40min at 55 ℃;

fifthly, adding oxalic acid into the mixed solution obtained in the step 4, and stirring for 30min to obtain the grinding fluid.

The above description is only a few preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.

Fig. 1 and fig. 2 are comparison graphs of grinding effects of the grinding fluid special for ELID grinding of the aluminum-based diamond and the grinding fluid special for ELID grinding composite material.

Claims

1. The special grinding fluid for the precision machining ELID of the aluminum-based diamond composite material is characterized in that:

the special grinding fluid comprises engine oil, soybean oil, petroleum sodium sulfonate, sodium benzoate, monoethanolamine benzoate, polyoxyethylene fatty acid ester, polyether ester, dimethyl silicone oil, molybdenum dioxide, chromium oleate, triethanolamine, methylbenzotriazole, benzisothiazolinone, oxalic acid, sodium orthosilicate, disodium hydrogen phosphate, naphthenate, tricresyl phosphate, sulfurized fatty acid ester, oleamide, lauric acid, sodium nitrate and water;

the weight percentage of each component is as follows: 2 to 3 percent of engine oil, 1.5 to 2 percent of soybean oil, 0.2 to 0.3 percent of sodium petroleum sulfonate, 0.1 to 0.2 percent of monoethanolamine benzoate, 0.1 to 0.2 percent of sodium benzoate, 0.8 to 1.5 percent of polyether ester, 1.5 to 2 percent of dimethyl silicone oil, 2 to 3 percent of molybdenum disulfide, 5 to 6 percent of polyoxyethylene fatty acid ester, 0.2 to 0.5 percent of chromium oleate, 0.2 to 0.5 percent of triethanolamine, 0.5 to 1 percent of benzisothiazolinone, 0.2 to 0.5 percent of methylbenzotriazole, 2 to 4 percent of oxalic acid, 0.2 to 0.3 percent of methyltrimethoxysilane, 0.2 to 0.3 percent of sodium orthosilicate, 0.2 to 0.3 percent of disodium hydrogen phosphate, 0.8 to 0.9 percent of naphthenate, 4 to 5 percent of trimethylbenzene phosphate, 3 to 6 percent of sulfurized fatty acid ester, 0.7 to 1 percent of sodium laurate, 1 to 1.8 percent of sodium nitrate, 60 to 70 percent of water.

2. A preparation method of special grinding fluid for precision machining ELID of aluminum-based diamond composite material is characterized by comprising the following specific steps:

s5, adding oxalic acid into the mixed solution obtained in the step S4, adding water, and stirring for 30-40 min to obtain the grinding fluid.