During the bronze wire pull up process of the cable industry in my country, the phenomenon of black oxidation and discoloration is common, and spring and summer are more serious. In this regard and its relationship, because the temperature of the wire drawing process and the friction between the mold directly affect the lubrication effect, we can analyze it from the following aspects: 1. The stretching speed and the use temperature; 2. The amount of fat; 3. how to prevent oxidation and hairs; 4. The stretching force.
1. Temperature and stretching speed The use temperature and lubrication effect of brushed oil are mutually interactive and affect each other. For example, the temperature is too low, the newly added brusten oil is not easy to emulsify, and the mass of the emulsion will decrease, which is not conducive to lubrication. Conversely, if the temperature is too high, the oil is easy to decompose, and it is suspended on the emulsion, which reduces the lubrication effect. If the temperature of the emulsion increases further and does not take effective measures to control its temperature, the oil film of the deform area may break, causing the chemical chain in the brushed oil process formula to break. In this way, the friction coefficient will inevitably increase. Under the vicious cycle, it will not only reduce the surface quality of the product, but also increase the temperature of the emulsion fluid rapidly, which will cause the waste rate to rise. Therefore, keeping the cooling state of high -speed brushes can not be ignored. Control the temperature below the oil membrane rupture point, and use the cooling tower or heat exchanger for balance treatment. 2. Fat amount The so -called fat amount can be simply understood as the thickness of the oil membrane formed by the brushed process in the deformation zone. Excessive fat amount of copper tick oil will cause the brushed process to be too thick in the oil membrane formed in the deformation zone. A, the oil film is too thick, the pulled copper wire lost the surface gloss B. The local uneven and incomplete part of the oil membrane causes the increase in direct contact area, increases friction and the surface of the pulled product is covered with oil spots. C. In addition, the amount of fat in the emulsification fluid is too high, and some of them will be swimmed out, causing the lotion to layered and adhere to copper powder, suspended on the emulsion, adhesive mold holes, causing blocking mold eyes, and then disconnect. In severe cases, the lubricating oil is destructive, resulting in the replacement of the whole pool, causing losses. If the amount of fat is too low, the oil membrane must be thin, or it cannot form a complete oil membrane. In the process of drawing, it is easy to cause rupture, which causes the stretching copper wire to contact the mold without the lubrication effect, increase the friction, and cause the following adverse conditions: A. Increased stretching force, it will cause regular breaks B. Increase friction, generate heat, increase oil temperature, increase fuel consumption C. Cause the surface quality of the wiring line D. Fast loss of molds, tower wheels, increased copper powder Therefore, when we choose the copper brushes lubricating oil, we must determine how much the concentration of the copper brushed oil that contains the amount of fat is required according to the line diameter of the specifications of the factory. Between 70-80 %, that is, the amount of fat contains only 70-80 kg per 100 kg of brushed oil, so when some use units are used to regulate the concentration of the instruction manual, 10kg of oil is added with 90kg of oil to 90kg of oil. Water thinks that it is fat and has reached 10 %. In fact, it is wrong. In fact, the amount of fat contains only 7 ~ 8kg, so it needs to be used to detect the content of its fat. The method is: At the room temperature at 24 ° C, add a plug -in tube at 100ml, add 10 ml of brushed oil crude oil, and add distilled water until the scale is 100ml. Wash the mirror surface with water and dry it with soft paper. A few drops of drops are equipped with evenly evenly on the mirror surface. After washing once, wipe it. Drop 1-2 drops on the sugar meter mirror surface, observe the light in the bright place, and the obtained reading is multiplied by 10 times the lipid content of this type of copper brushed oil.
3. How to prevent oxidation and hairstyle There are many reasons that cause the copper thread to be black, oxidation: (1) The area of the brushed emulsification tank is small, the return pipeline is short, and the seal is sealed, resulting in slow heat dissipation, resulting in the high temperature of the emulsion liquid oil. (2) It is caused by the reasons for the annealing of copper wire. The first is that the cooling water that Latin retreats is generally used with tap water and groundwater. Because the quality of the water is different, the pH value of the water quality in some areas is low, only 5.5-5.0. After the annealing, the copper wire is easy to oxidize and black; the second is the decline of the finished copper wire that is pulled by the ordinary drawing machine on another annealing line. The cooling water does not use antioxidants. Oxidation hair black phenomenon; (3) It is some old factories who also use annealing cylinder to anneal. The following reasons will also cause oxidation and black: First, the heating cylinder nut is not tightened, and the air leakage after the carbon dioxide or high pure nitrogen; When the temperature of the copper line is too high, when it exceeds 30 ° C; the third is that the brushed emulsion liquid is not maintained enough, and the pH value is too low; these situations are more common when the summer temperature is high. Fast, if new crude oil is not supplemented in time, at this time, the amount of fat is very small, and the temperature is high, and the temperature of the emulsification liquid may exceed 45 ° C, which can easily cause oxidation hair black. (4) Another situation is that because high -speed drawing is currently used, the speed has been increased, and the relative heat dissipation time is reduced, which brings a certain amount of space and time to oxidation. The situation, whether the temperature, the pH value, etc. are appropriate? The bacteria of the yellow mildew rain in the spring of the spring are relatively fast. It can use sterilization and mold. In summer, antioxidants can be used to solve the problem of oxidation and black. 4. Stretching force During the normal operation of brushes, the higher its rush speed, the easier it is to bring the emulsion to the moldhole to increase the pressure of the lubricating fluid in the mold. As a result, the thickness of the lubricating membrane is increased to reduce the friction coefficient. In the process of stretching, the greater the load, the greater the pressure. As a result, the emulsification solution is easily squeezed out of the deformation area, thereby reducing the thickness of the lubricating oil film, increasing the actual contact area, thereby increasing the friction coefficient. The effect of stretching force on the lubrication effect: the greater the stretching force, the greater the pole pressure it produces when the same weight or length of the pull system, and the more thermal skills are transformed. At this time, the larger the wire temperature is ascending. Therefore, the factors that affect the stretching force will deform resistance, and the damage of the mold will increase the stretching force. The stronger the stretching force, the more friction, the friction loss has also increased, and the transformation to the thermal energy, which increases the surface temperature of the wire material, which causes the emulsion to the oil temperature to increase. This cannot be ignored.
