Drawing oil, also called drawing fluid, is an indispensable industrial additive in the copper wire production process, which can reduce the wear of the metal wire and the eye mold in the copper wire drawing process, and obtain Good cooling effect. It is widely used in wire production, copper wire drawing and other industries. The concentration of drawing oil is closely related to the product quality of copper wire, so it is necessary to strictly control the concentration of drawing oil in actual production to ensure that high-quality copper wire is drawn.
1. Lubrication and water-soluble copper wire drawing oil In nature, when two objects are in contact with each other and act on each other, there is friction. During the stretching process of the metal wire, this friction phenomenon generates a lot of heat, and causes the wear of the metal wire and the eye mold (DIES). To reduce friction Resistance, reduce the loss of metal wires and eye molds, and obtain a good cooling effect, it is necessary to use water-soluble copper wire drawing fluid. Water-soluble copper wire drawing annotation is a water-soluble lubricant. Good wire drawing oil can also be used for lubrication and cooling, which can reduce the friction and wear of the metal wire and the eye mold, and avoid the corrosion and wear of the metal wire. Copper wire drawing fluid is manufactured for the purpose of lubricating and cooling above. The required wire drawing oil must have high lubricity, strong rust resistance, high defoaming, better cleanliness, more perfect emulsification system, easy on-site operation, and good stretching. The wire machine is easy to maintain, in order to stretch out high-quality copper wire. 2. Drawing oil management The lubricating operation promoted under a planned, organized and systematic arrangement is called wire drawing oil management. Management is as important as the maintenance of human health. Good management can make machinery and equipment healthy and long-lived, and make products of high quality. An off-topic subject of modern factory management. The key points of management are: 1) Select the appropriate wire drawing oil 2) Proper storage before use: It is best to store it indoors, avoid sun, rain and cold outdoors. 3) When using, add oil and water according to a certain time. Regularly check the quality of the wire drawing fluid and change the oil, and make a record 4) Waste oil treatment. Management of water-soluble copper wire drawing oil in use 1) Determination of water quality: Water accounts for most of the wire drawing fluid on site, so the quality of the water quality is directly related to the quality of the wire drawing fluid. It is advisable to add an appropriate amount of wire drawing oil to soft water when deploying the on-site emulsion. (The optimum liquid temperature should be 40 degrees plus or minus 3 degrees, more than 50 degrees is easy to deteriorate). Determination: Soft water with hardness below 50PPM, chloride ion below 10PPM, and no sulfate ion. Hard water with hardness above 200PPM is poor.
2) Concentration determination: The influence of the drawing oil concentration on the process is the most important. Generally, the concentration used is about 2% to 3.5%, which varies according to different environments.
3) Determination of emulsion stability: The more stable the emulsification, the direct enhancement of its lubricating and cleaning properties. A. Standard method: ASTM D 1479, the change of the oil content of the bottom layer of the drawing fluid is measured after the prepared drawing fluid is allowed to stand for 24 hours. B. Simple method: Make an emulsion with 500PPM hard water and boil it for three minutes to observe the degree of oil slick. It would be better if there is an optical instrument to see the radius of the oil droplets in the emulsion.
4) Foam determination: Stretch fluid requires a defoaming system to maintain proper operation. A. Standard method: ASTM D 892, add oil in a 1000ml graduated cylinder, make the oil level 180ml, when heated to 93.5 degrees, put in clean porous stone balls, and record the foam height at a fixed time after passing through the body. B. Simple method: Put the thread extension liquid at half the height of the test tube, hold the mouth of the test tube with your hand, shake it back and forth three times, and observe whether the defoaming rate is completely eliminated within five seconds. C. Soft water and pure water have a long service life, but there is more foam, and an appropriate amount of defoamer can be added to adjust. Low temperature foam is more, and high temperature foam is less.
5) Lubrication traffic measurement: The United States federal government standard test method No. 650, that is, using a four-ball test machine test.
6) Determination of aging content: After the wire drawing fluid is used, it is inevitable that there will be foreign contaminants and the lubricant itself oxidized and deteriorated. These undesirable substances are collectively referred to as aging substances. The oil change time can be estimated from the amount of aging substances. The allowable amount of aging substances is 10% when oil is present.
7) Corrosion test: That is to measure the rust resistance of copper wire. A. Standard method: ASTM D 130 or CNS 1219 K 323, immerse the polished copper sheet in the drawing fluid heated to 100 degrees, take it out for inspection after 3 hours, and then compare it with the standard copper sheet. B. Simple method: reduce the above measurement time to 3 minutes, that is, watch the discoloration of the copper sheet after boiling for one minute.
8) Determination of copper ion content: The determination of the copper ion content in the drawing fluid has a similar meaning to the determination of the aging material. The oil change time can be measured by the amount of copper ions, and the copper ions in the oil tank should not exceed 600-700PPM. A. Standard method: Determination by atomic absorption spectrometer (AA). B. Simple method: add 1 ml of stretching solution to a 125 ml separatory funnel, add 49 ml of distilled water, adjust the pH to 3.0 with hydrochloric acid, add 10 ml of color-forming solution, shake the separatory funnel, and let it stand for a while. After the organic layer is clear, the organic layer is leaked out from the separating funnel, and the copper ion concentration is determined by colorimetry at 450NM of the colorimeter. The color-forming solution is provided by our company free of charge.
9) PH value determination: The previous wire drawing fluid needs to have a value of PH8-10, and the most suitable wire drawing fluids in Europe and America are PH8.0-9.2. A. Standard method: measure with pH meter B. Simple method: It is determined by the color change of PH paper. The contact time between the PH paper and the test solution will take another three minutes to have a more correct color change.
10) Conductivity determination: The measurement of electrical conductivity can detect that the ion concentration of the wire drawing solution is too high, which will destroy the wire drawing solution and damage the quality of the copper wire. Determination method: measure with conductivity meter or resistance meter.
11) Bacteria detection: Bacteria will devour the fatty acids in the oil, destroy the emulsification of the wire drawing oil, produce viscous or non-viscous substances, make the wire drawing fluid smelly, dirty and aging, and affect the quality of the wire. The effect of drawing oil concentration on the process is very important. Generally, the concentration used is about 2% to 3.5%, which varies according to different environments.
