Aluminum foil processing is a vital part of the enterprise, related to an aluminum enterprise yield and corporate profit points. The higher the yield, the greater the profit point of the enterprise. Of course, the yield is every link to control, standardized operation, but also the need for sophisticated equipment and strong sense of leadership, staff. Equipment and operating norms I do not understand, not pointing, I can only cut the knife in accordance with the practice of analysis. Here I talk about why cutting will produce Alice, multilateral, off powder. Alice, Multilateral, out of powder problems to remove the material itself and equipment problems, most of them are related to the blade. Usually there are two kinds of aluminum foil cutting blade. One is a round blade, one is a chip-style blade also known as razor. The razor blade is fixed at a point, with the material being wound and cut off. Aluminum foil for the active cutting, the faster the blade resistance is relatively small. The more slowly the opposite. The thickness of the blade corresponds to the resistance. The thicker the blade, the greater the resistance. The thinner is the opposite. As the razor blade is fixed, knife and foil, thin material contact, the point is prone to fatigue, so after a period of time will not sharp knife edge, knife blunt will appear tearing phenomenon, Burnt is inevitable. Of course, these are also related to the cutting angle. Selection of good razor blades is the first choice to solve these problems, ceramic blades should be preferred.
At present, all aluminum foil companies want to process high value-added battery foil, but the battery foil acceptance standards are harsh. Representative lithium battery companies like: BYD, ATL, A123 batteries business, the acceptance of aluminum standards called harsh. On the foil requirements of high, but also on the wide, dust, Alice is also harsh in the harsh. So the output is not high battery foil business, after processing cutting rate, is essential.
[Ceramic and steel blade distinction] In the high-speed cutting, the steel blade heat dissipation coefficient is poor, the higher the cutting speed, the greater the coefficient of friction, resulting in more heat will be trapped in the steel blade heat more. During the cutting process, the heat of the foil and the blade will produce heat, part of the heat with the roll has been dispersed at room temperature, while the other part of the heat to stay in the steel blade, and is the cumulative heat, the longer the cutting time, the more speed High, stay on the blade will be more heat. So that the blade and heat conduction to the foil, it formed a foil heat transfer, because this time the blade has been high temperature and then contact with the foil will produce dust sticks, so that the blade to the sharpness, the formation of powder, Alice The While the blade overheating will make the blade lost the original hardness, and loss of durability and sharpness, resulting in powder, lotus leaf and so on. The ceramic blade, at room temperature work, no static load, good heat dissipation. Ceramics itself is commonly used lubricants. This is also one of the reasons why ceramic inserts are more durable than German coated blades. There are ceramic inserts that are high hardness, hardness in the Mohs 9, second only to the diamond. High-speed cutting in the ceramic comes with lubrication function, in the cut 4 hours after the blade and foil, thin material friction but more sharp. This is another part of the durability. At present, such as Hangzhou Ding Sheng, aluminum Luoyang aluminum foil, Luoyang Longding, Nanshan Aluminum has been aware of the ceramic blade can reduce the cutting of aluminum powder in more than 50%.
[Aluminum foil round blade of the two kinds of cutting method] round blade is part of the aluminum foil is actively cut, that is, round blade is rolling material rolling rotation, and the razor blade is the same way, but there are more cutting edge Contact with material. This way because the blade itself is passive, affected by the speed of the material, the contact point, the blade is under pressure. Material winding is a beating, because the blade itself is no power, winding fluctuations prone to Alice.
Round knife active cutting, which is the most common way. Round knife active cut there are two, one is coaxial rotation, one is one-arm motor drive. Individuals are more optimistic about the one-arm drive, which can be based on different thickness of the material, adjust the blade speed. Round knife conventional situation with the next knife with the cut, and we usually see is the butterfly on the knife, why do we use butterfly on the knife it? This is passed from Japan and South Korea, because the parallelism is not enough, with a butterfly blade can make up for this deficiency, we usually have to butterfly on the knife to the pressure on the knife, is afraid of parallelism is not enough A good product. This point please note: the Germans, do not butterfly-shaped bowl. Their blades are all flat, because their blade parallelism error does not exceed 0.5um. But usually the German slitter blade thickness will be selected in more than 2mm. Because the blade is thinner, the parallelism tolerance is more difficult to control. But the thicker the thickness, the greater the resistance, the more prone to Alice, indentation, powder out of the situation. Personal, more inclined to thin blade, that the thinner blade, cut out the product will be better. But it is not recommended to use the upper and lower knife to fit the pressure of the cutting method. Knife on the knife and the next knife more tight, the more prone to dust on the foil material, the best way is the knife for the flat round (non-butterfly), from the seam cut. This method is to reduce the friction between the knife and the knife on the knife, the friction beating is due to equipment, knife flatness, and the cutting will always fall into the dust will fall into the gap between the upper and lower blades, But also easy to squeeze material, which is why the more tight fit will fall off the powder reasons. Why is there a dust in the cutting of the foil, because no matter how good the cutting is torn in the way of cutting, the number of dust is only a relative value, cutting dust has been there, is relatively controllable, in line with the standard only. Blade, is to reduce the dust and Alice is essential to the link, the thinner the blade, the smaller the value of sprinkling, the less dust. The thicker the blade, the greater the spill. The dust will increase. Blade sharpness also has a very large relationship, usually a knife sharpness, to use a magnifying glass or projector, the knife to enlarge more than 120 times to see if there is no obvious jagged, if there is a clear jagged, Burr is inevitable. Dropping powder and slitter speed, the knife is also proportional to the speed, knife speed slower than the winding speed, dust will not increase, but there will be indentation, Alice. On the knife speed is too high, it will produce the blade and foil secondary friction, there will be a lot of dust. The best way is: "the knife speed is slightly higher than the winding speed of 6 ~ 8%", at this speed, Alice and dust can be controlled, is an ideal value. Slice dust, Alice and knife knife also has a great relationship, it is recommended: cut with a flat round knife, not to close the knife off the way (on the knife and the knife is not a slot with a cut) Of the parallelism requirements are very high, to be controlled within 2um, both sides with a single edge blade double angle blade, reduce the edge of the friction coefficient, reduce the risk of waste scraping. The middle with double-edged double-angle blade (sword edge), on the knife 0.3 ~ 1.0 in the middle. Of course, off powder, Alice, which with the slitting tension, material thickness, thin material of different materials also have a great relationship, hard material is relatively good to cut some of the upper and lower knife from the gap slightly larger, the maximum can not exceed 0.08 Alice side problems will arise. Soft material is more prone to Alice, up and down the knife from the gap can not exceed 0.04. Of course, up and down the knife from the gap and the thickness of the material has a great relationship, the thinner the material, the gap to be smaller. It is best to use a scale display to adjust the upper turret.