1 Introduction Gear cutters, including small-diameter extended gear hobs, radial shaving cutters, helical-toothed cutters, and Wafer-toothed cutters, are difficult to machine materials such as superhard and super-strength due to the special processing technology. In the middle, the friction and friction heat are greatly improved. If the lubrication performance is not good, the surface of the workpiece is liable to be pulled, and the service life of the tool is rapidly decreased. This requires better lubrication and cooling of the machining lubricant (liquid). Performance in order to achieve the desired machined surface. This paper introduces the preparation method of butyl oleate and its influence on the performance of gear cutting lubricants, which is of great significance for improving the quality of gear cutting.
2 oleic acid properties Oleic acid has excellent lubricating properties, high adsorption heat and good wear resistance. It is one of the important friction modifiers in fatty acids, and the performance of common friction modifiers is compared. Oleic acid has a high heat of adsorption and a small amount of wear.
3 Synthesis of butyl oleate Using ethylene glycol as the medium, under the condition of 200, the COOH group of oleic acid is esterified with the OH group of butanol to form butyl oleate, and some oleic acid and B The diol reacts to form a small amount of by-products such as ethylene glycol monooleate and ethylene glycol dioleate. Ethylene glycol oleate and butyl oleate are excellent oily agents and have excellent lubricity.
4 The role of butyl oleate in gear cutting lubricants Under the test conditions of processing speed of 200mm / min, the sliding friction coefficient of butyl oleate in mineral oil, side wear.
Butyl oleate can significantly improve the lubricating properties of cutting lubricants. The coefficient of friction decreases with the increase of the content of butyl oleate. This is because the butyl oleate has a strong COOH polar group, which has a large affinity for metals and is easily adsorbed on metals. On the surface, a molecularly oriented adsorption lubricating film is formed. As the content of butyl oleate increases, the number of polar groups adsorbed on the friction surface increases, so the lubricity increases and the corresponding friction coefficient decreases. When the amount of butyl oleate exceeds 5, the polar group already occupies the entire friction surface, and thus the coefficient of friction reaches a stable value. However, the extreme pressure performance has a great relationship with the amount and molecular structure of the lubricant. Therefore, when the amount of butyl oleate exceeds a certain value, the PB and PD values ​​reach a maximum, rather than continuing to increase, due to the limitation of the molecular structure. As shown in table 2.
The maximum amount of side wear is pure mineral oil, followed by cutting oil with 5 extreme pressure agent. The least amount of wear is gear cutting oil containing 5 pole pressure agent and 5 butyl oleate.
In metal cutting, most of the friction is boundary lubrication. The polar atomic groups contained in the oily agent and the extreme pressure anti-wear agent which strongly adsorb the metal form competitively adsorbing at the cutting interface to form a strong physical adsorption film, which can prevent or reduce between the workpiece, the chip and the tool. The direct contact achieves the purpose of reducing friction and bonding, thereby providing excellent lubrication and thus extremely low wear.
5 Gear cutting lubricant formula The main components of the gear cutting lubricant are: butyl oleate, base oil, extreme pressure agent. Butyl oleate is synthesized by the author. Oleic acid is derived from Sichuan Xipu Oil Chemical Co., Ltd., and other components are commercially available. Distribution ratio of each group.
The quality index of 6 gear cutting lubricants is tested according to the national standard for the physical and chemical properties of gear cutting lubricants.
7 Conclusion After the completion of the development of the butyl oleate gear cutting lubricant, the effect was very satisfactory. Taken together, the product has the following advantages: 1) Excellent lubrication performance. A lubricating film can be formed in the cutting zone, the surface processing precision is remarkably improved, and no napping occurs. 2) The maximum non-biting load of the cutting fluid has a PD value of 5800N or more, and the tool life is greatly increased. Thereby improving work efficiency.
The butyl oleate synthesized in ethylene glycol medium has excellent antifriction properties and is a good oily agent. It is added to the gear cutting lubricating oil and shows excellent lubricating performance, which greatly improves the quality of gear cutting. And efficiency.
A4 Label,A4 Label Paper,A4 Label Sheets,A4 Sticker
Jiangmen Hengyuan Label Technology Co., Ltd , https://www.jmhypaper.com