Development of the hottest SP202 grinding fluid an

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Development of SP202 grinding fluid and its tribological performance evaluation

the linear speed of the grinding wheel in modern grinding has been increased from m/s to 100m/s or higher. The deep and slow grinding process has realized the historic transformation of "grinding instead of turning". Under such harsh working conditions, emulsion as lubricating and cooling medium can no longer adapt. The chemical synthetic grinding fluid developed in recent years is more suitable for shortening the detection cycle and high-speed grinding, but there is still a lack of research on the relationship between the friction performance of grinding fluid and the effect of grinding process. Discussing this aspect will be beneficial to the development of grinding fluid and even grinding process

in this paper, some grinding fluids at home and abroad are selected. Through bench test and grinding ratio test, the properties of grinding fluids are tested and investigated μ、 Pb, PD and other parameters are related to the grinding process effect (grinding force, grinding efficiency, grinding ratio, grinding surface roughness, etc.), and on this basis, SP202 grinding fluid with ideal tribological properties is developed. SP202 synthetic grinding fluid and its characteristics

sp202 synthetic grinding fluid (hereinafter referred to as SP202) uses Mo-B and B-N compounds as the main additives, which are considered to be non-toxic or low toxic substances. The surfactant used is easily biodegradable and will not cause residual environmental pollution after discharge. The system is stable and can always maintain a transparent state in the process of use. It can maintain good penetration and cleaning ability for a long time, and there is no mildew and deterioration. The main ingredients of SP202 are as follows:

1) surfactant, which belongs to polyether and polyol, and the dosage is 6% based on the quality percentage w (the same below) of the special deployment of relevant work by the quality inspection center

2) oily agent, belonging to fatty acid esters, with the dosage of 4%

3) the antirust agent belongs to molybdenum boron composite agent, and the dosage is 8%

4) the non-ferrous metal corrosion inhibitor is benzotriazole, and the dosage is 0.1%

5) extreme pressure agent is boron nitrogen compound, and the dosage is 10%

6) the coupling agent belongs to polyols, and the dosage is 1%

7) the complexing agent is ethylenediamine tetraacetate, and the dosage is 0.5%

8) defoamer belongs to dispersant and silicone oil, and the dosage is 0.2%

9) other components are deionized water

according to the technical indicators specified in gb/t, all items of SP202 grinding fluid meet the requirements of the standard. 5% diluent Pb is 431.2n. Gb/t standard stipulates that the diluent Pb of class II synthetic cutting fluid is ≥ 392n, Pb of class III and class IV is ≥ 686n, and the friction coefficient μ And PD values are not specified. However, we found in testing some imported samples that the Pb value of some commodity grinding fluids is lower than 392n and 686n; But almost all have lower μ And higher PD values (see Table 1). Therefore, it is considered that: Research μ、 The influence of Pb and PD values on the grinding process effect is undoubtedly of certain significance

Table 1 Comparison of domestic emulsion and several imported samples μ、 Pb, PD value

cutting fluid category emulsion

(domestic) synthetic fluid

(United States) micro lotion

(United States) micro lotion

(Japan) synthetic fluid

(Italy) friction coefficient μ 0.148 0.090 0.087 0.088 0.093 Pb value/n 686 372.4 539 553.5 392 PD value/n there is a trend that hardness experiment gradually replaces tensile experiment 784 1234.8 1744.4 1666 1176 ratio pd/pb 1.14 3.32 3.24 3.01 3.0 evaluation of Pb and PD value and use effect of grinding fluid

in order to evaluate the influence of Pb and PD value of grinding fluid on grinding force, grinding efficiency and grinding surface quality, we adjusted the oily agents in grinding fluid Prepare test solutions with different Pb and PD values according to the content and proportion of extreme pressure agent

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