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          CNC machining manufacturers center milling cutter selection principles _ how to deal with CNC machining center overcut problem

          2018-07-03

          CNC machining manufacturers milling cutter selection principles _ how to deal with cnc machining center overcut problem


          The milling cutter should be used for machining planes, steps, grooves, forming surfaces and blocking workpieces on the cnc machining center milling machine. This has a great influence on the quality of the workpiece. How to choose the right milling cutter? What are the principles?


          The milling cutter used in the cnc machining center should be made of all hard alloys, and the general milling machine should be made of white steel. White steel milling cutters and carbide milling cutters are relatively softer. Carbide milling cutters are hot and hard, but they are resistant to impact. If you just drop the blade, it will be broken. The cemented carbide is made by powder metallurgy. The hardness can reach about 90HRA, and the heatability can reach 900-1000 degrees.


          1, the number of milling cutter teeth


          When selecting a milling cutter, consider its number of teeth. For example, a coarse-tooth milling cutter with a diameter of 100 mm requires only 6 teeth, while a dense-tooth milling cutter with a diameter of 100 mm can have 8 teeth. The size of the pitch will determine the number of teeth that will be involved in the cutting when milling, which affects the smoothness of the cutting and the cutting rate of the machine.


          2, chip pocket


          Rough-tooth milling cutters are mostly used for roughing because they have large chip pockets. Assuming that the chip pocket is not large enough, it will constitute a difficulty in the crumb or the chip will be in conflict with the cutter body and the workpiece. At the same feed rate, the coarse-tooth milling cutter has a larger cutting load per tooth than the dense-tooth milling cutter.


          3, depth of cut


          The cutting depth is fine when finishing milling, generally 0.25-0.64mm. The cutting load per tooth is small (about 0.05 - 0.15mm), the required power is not large, the fine-tooth cutter can be selected, and a large feed can be selected.


          4, the application of rough milling


          Excessive cutting forces can cause chattering on less rigid machine tools during heavy-duty roughing. This chattering causes the chipping of the carbide insert and then shortens the tool life. The use of coarse-tooth milling cutters reduces the need for machine power.


          The milling cutter used in the cnc machining center is more expensive. The price of a face milling cutter with a diameter of 100mm may be three or four thousand yuan, so it should be selected carefully. Many people who have operated cnc machining centers have encountered cutting problems. How to deal with this situation?


          The machining process of the workpiece in the cnc machining center is no longer like the traditional processing equipment. It requires the uninterrupted control of the machine tool to end, and the various functional components of the machine tool are manipulated to perform messy and precise movements, thereby completing the machining process with high precision and high efficiency. The preparation of the workpiece machining program is the key to the machining of the machining center workpiece. However, if the programming is unreasonable or the parameters are not properly set, the machining accuracy and machining power of the workpiece will be seriously affected, such as overcutting. Overcutting is a serious problem in the processing of workpieces, which can lead to the obsolescence of workpieces. In the case of NC programming, the first-line processing personnel compiled a machining program that must be attacked for some reason. The system can announce the alarm signal in advance during the work process, so as to avoid the occurrence of over-cutting. How do you judge the cause of the overcut phenomenon in the cnc machining center?


          1. Overcutting during arc machining of machining center


          When the machining center performs the inner arc machining, if the tool radius rD is too large and exceeds the radius R of the arc to be machined, it is likely to overshoot. The NC machining program is programmed according to the actual practice of the workpiece, regardless of the movement orbit of the tool during the machining process. Because there is a tool radius that makes the tool practice track coarse and does not coincide with the programmed track, in order to get the correct workpiece surface summary, it is necessary to set the tool path and the programming track with the tool radius compensation command. Otherwise the workpiece cut will be inevitable.


          2. Overcutting discrimination during linear processing


          When machining a workpiece consisting of straight segments in the cnc machining center, if the tool radius is selected too large, it is highly probable that the cut will occur and the workpiece will be discarded. It is possible to discriminate between the positive and negative of the scalar product of the correction vector and its corresponding correction vector.


          What are the principles of milling cutters? How to deal with the problem of cnc machining center overcutting


          The milling cutter should be used for machining planes, steps, grooves, forming surfaces and blocking workpieces on the milling machine of Kunshan CNC machining factory. This has a great influence on the quality of the workpiece. How to choose the right milling cutter? What are the principles?


          The milling cutter used in the cnc machining center should be made of all hard alloys, and the general milling machine should be made of white steel. White steel milling cutters and carbide milling cutters are relatively softer. Carbide milling cutters are hot and hard, but they are resistant to impact. If you just drop the blade, it will be broken. The cemented carbide is made by powder metallurgy. The hardness can reach about 90HRA, and the heatability can reach 900-1000 degrees.


          1, the number of milling cutter teeth


          When selecting a milling cutter, consider its number of teeth. For example, a coarse-tooth milling cutter with a diameter of 100 mm requires only 6 teeth, while a dense-tooth milling cutter with a diameter of 100 mm can have 8 teeth. The size of the pitch will determine the number of teeth that will be involved in the cutting when milling, which affects the smoothness of the cutting and the cutting rate of the machine.


          2, chip pocket


          Rough-tooth milling cutters are mostly used for roughing because they have large chip pockets. Assuming that the chip pocket is not large enough, it will constitute a difficulty in the crumb or the chip will be in conflict with the cutter body and the workpiece. At the same feed rate, the coarse-tooth milling cutter has a larger cutting load per tooth than the dense-tooth milling cutter.


          3, depth of cut


          The cutting depth is fine when finishing milling, generally 0.25-0.64mm. The cutting load per tooth is small (about 0.05 - 0.15mm), the required power is not large, the fine-tooth cutter can be selected, and a large feed can be selected.


          4, the application of rough milling


          Excessive cutting forces can cause chattering on less rigid machine tools during heavy-duty roughing. This chattering causes the chipping of the carbide insert and then shortens the tool life. The use of coarse-tooth milling cutters reduces the need for machine power.


          The milling cutter used in the cnc machining center is more expensive. The price of a face milling cutter with a diameter of 100mm may be three or four thousand yuan, so it should be selected carefully. Many people who have operated cnc machining centers have encountered cutting problems. How to deal with this situation?


          The machining process of the workpiece in the cnc machining center is no longer like the traditional processing equipment. It requires the uninterrupted control of the machine tool to end, and the various functional components of the machine tool are manipulated to perform messy and precise movements, thereby completing the machining process with high precision and high efficiency. The preparation of the workpiece machining program is the key to the machining of the machining center workpiece. However, if the programming is unreasonable or the parameters are not properly set, the machining accuracy and machining power of the workpiece will be seriously affected, such as overcutting. Overcutting is a serious problem in the processing of workpieces, which can lead to the obsolescence of workpieces. In the case of NC programming, the first-line processing personnel compiled a machining program that must be attacked for some reason. The system can announce the alarm signal in advance during the work process, so as to avoid the occurrence of over-cutting. How do you judge the cause of the overcut phenomenon in the cnc machining center?


          1. Overcutting during arc machining of machining center


          When the machining center performs the inner arc machining, if the tool radius rD is too large and exceeds the radius R of the arc to be machined, it is likely to overshoot. The NC machining program is programmed according to the actual practice of the workpiece, regardless of the movement orbit of the tool during the machining process. Because there is a tool radius that makes the tool practice track coarse and does not coincide with the programmed track, in order to get the correct workpiece surface summary, it is necessary to set the tool path and the programming track with the tool radius compensation command. Otherwise the workpiece cut will be inevitable.


          2. Overcutting discrimination during linear processing


          When machining a workpiece consisting of straight segments in the cnc machining center, if the tool radius is selected too large, it is highly probable that the cut will occur and the workpiece will be discarded. It is possible to discriminate between the positive and negative of the scalar product of the correction vector and its corresponding correction vector.




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