Views: 145 Author: Site Editor Publish Time: 2021-01-28 Origin: Site
In order to extend the service life of the tool, it is necessary to select a reasonable type of metalworking fluid and optimize the processing method. This is especially true for difficult-to-process materials. When cutting difficult-to-machine materials, high-quality cutting fluid is required. The cost of this cutting fluid is also relatively expensive. However, in the cutting process, difficult-to-machine materials often adversely affect the metal cutting blade life. Therefore, it is very necessary to choose a suitable cutting fluid to effectively extend the service life of the tool and reduce the processing cost. The direct cause of tool damage is cutting force and cutting heat. Therefore, no matter which processing method is used, the fundamental purpose is to minimize the temperature of the cutting point and the processed area of the part, prevent the surface hardening of the processed part and the temperature of the tooltip, increase the heat dissipation area, and control Cutting force.
Properly controlling the cutting force and cutting speed of the tool is one of the most effective means to reduce the temperature of the processing area and extend the service life of the cutting fluid. When processing difficult-to-machine materials, the cutting edge is generally finely ground, and the cutting depth and cutting width should not be too large. When choosing the cutting linear speed, it is necessary to consider factors such as different material types, part structures, and processing equipment. In general, if the processing material is a nickel-based alloy, the line speed should be controlled at 20-50 meters per minute. The processing material is a titanium alloy, and the linear speed should be controlled at 30-110 meters per minute. The processing material is PH stainless steel, and the linear speed should be controlled within the range of 50-120 meters per minute.
For difficult-to-machine materials, choosing different cutting methods has great differences in the damage of cutting fluid. No matter which cutting method you choose, the principle is the same, that is, to reduce the cutting force and temperature in the cutting zone as much as possible. The cycloidal cutting method can minimize the cutting area and minimize the actual cutting angle of the cutting fluid, thereby extending the heat dissipation time of each tooth of the tool and reducing the cutting temperature. The spiral interpolation method can make the cutting amount of each tooth relatively uniform, avoiding the concentration of cutting force on a few teeth and accelerating wear. This effect is most obvious in corners. The high-feed cutting method is used to effectively reduce the cutting force with a smaller depth of cut and a larger feed, which results in the smallest cutting heat during processing and the lowest temperature in the processing area.
In metal processing, generally, a large amount of cutting heat is generated on the cutting chips. If the length of the chips can be controlled to ensure timely and effective chip breaking, this part of the cutting heat can be taken away by the chips. Therefore, chip breaking is an effective way to control the cutting temperature. When processing difficult-to-process materials, especially during roughing processes, under the premise that the rigidity of the processing system allows, try to make it break the chips during the entire processing process. At the same time, the cutting fluid with good sedimentation performance is used to discharge the sedimentation of the cutting chips. Do not let cutting chips rub against the surface of the machined workpiece. Liannuo chemical general cutting fluid SCC730A can be used. SCC730A water-based environmentally friendly cutting fluid is made of special high-performance extreme pressure additives, rust inhibitors, and other additives. It is a high-performance multi-purpose cutting/grinding fluid. When mixed with water, it can form a stable transparent solution. It has good sedimentation, extreme pressure lubricity, rust resistance, cooling, and cleaning properties. It also has a strong anti-microbial decomposition ability and can still maintain its stability under different water hardness conditions. The service life is more than 5 times that of ordinary emulsified oil.
●Replace traditional emulsified oil, suitable for processing most materials;
●Using water-soluble and oil-soluble rust inhibitors to protect equipment and workpieces from rust;
●Excellent sedimentation, biochemical stability, and strong anti-corruption ability;
●Low foaming tendency, good cleaning performance;
●High transparency, good for monitoring the surface processing state of the workpiece.
Different cutting fluids should be selected according to the requirements of machining conditions and machining accuracy. For high-speed machining such as high-speed cutting, drilling, etc., if the heat generated cannot be taken away by the cutting fluid in time, metal cutting knife sticking will occur, and chip buildup will occur in serious cases. This will seriously affect the roughness of the workpiece and the service life of the tool. At the same time, heat can also deform the workpiece, which seriously affects the accuracy of the workpiece. Therefore, the choice of cutting fluid must take into account its own lubricity and cooling performance. For finishing, choose emulsified anti-friction cutting fluid or low viscosity cutting oil, such as "Liannuo Chemical" emulsified cutting fluid SCC101 and cutting oil NC600. For semi-finish and rough machining, you can choose low-concentration emulsified anti-friction cutting fluid or semi-synthetic anti-friction cutting fluid with good cooling performance, such as "Liannuo Chemical" emulsified cutting fluid SCC102 and semi-synthetic Cutting fluid SCC618.
For the grinding process, the grinding debris is very small, and a lot of heat will be generated during the grinding process. Therefore, when choosing a cutting fluid, it is necessary to consider not only the lubrication and cooling performance, but also the filterability of the cutting fluid. If the selected cutting viscosity is too large, the chips cannot be deposited or filtered out in time, then the surface of the workpiece will be scratched as the cutting fluid circulates to the processing area and the finish of the processed surface will be affected. Therefore, for fine grinding or superfine grinding, use low-viscosity anti-friction grinding oil or semi-synthetic anti-friction cutting fluid, such as "Liannuo Chemical" semi-synthetic cutting fluid SCC638. For semi-finishing or rough grinding, low-concentration semi-synthetic cutting fluid or fully synthetic cutting fluid can be selected, such as "Liannuo Chemical" semi-synthetic cutting fluid SCC638A and fully synthetic cutting fluid SCC750A.
In the selection of cutting fluid, in addition to the lubricity and cooling properties of the cutting fluid, the rust resistance, cost, and easy maintenance of the cutting fluid must also be considered. The cutting oil is made of base oil with relatively low viscosity and added with anti-friction additives, which can achieve lubrication and anti-friction, as well as good cooling and easy filtering. But the problem with cutting oil is its low flashpoint. In high-speed cutting, the smoke is heavier, the flashpoint is low, the risk factor is high, and the volatilization is fast, and the user's use cost is correspondingly higher. Therefore, try to use water-soluble cutting fluid when conditions permit.
For water-based cutting fluids, it is more important to consider their rust resistance. The commonly used water-based aluminum rust inhibitors are silicate and phosphate. For workpieces that have been stored for a long time between procedures, use cutting fluids with phosphate-type rust inhibitors during cutting processing.