CNC milling machining is a CNC machine tool trajectory by means of computer controlled machine, using high speed rotating cutting tool if you want to shape the material. With the size of products have become increasingly demanding, machining from the original two gradually changed to 3 axis machining, 4 axis machining, 5 axis machining center, precision can reach 0.001mm. us the maximum machine processing size: 500mm * 1000mm *600mm, 800kg machine under the maximum weight of workpiece, Machine tool spindle speed 20000RPM to ensure that the surface of the workpiece is smooth and clean.we often processed material of aluminum,steel, copper, stainless steel, titanium, POM, Teflon and so on. At the completion of high quality, high dimensional accuracy of CNC milling machining parts process, we will divided into rough machining and processing method fine to get the best effect, the margin size coarse and finish machining is 0.5 * 1mm. after processing some of the products after surface treatment such as plating polishing surface passivation.Sand (powder), anodic treatment (aluminum common CNC anodized black red blue anode, anode, anode). CNC milling machining is widely used in aviation, automotive, communications, medical equipment, electrical appliances, drone.
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Generally, the gear shaft should be made to consider high temperature resistance, wear resistance, fatigue resistance and sufficient mechanical strength, and the journal and the sliding bearing at both ends of the gear shaft cannot be lubricated with a common lubricating grease. Since the usual grease can contaminate the melt, it can only be lubricated using the melt delivered by itself. For the mechanical strength design of the gear shaft, refer to the shaft design requirements in the Mechanical Design Manual, and will not repeat them here.
Several special problems in the design of the gear shaft are now discussed. Selecting the gear with less axial force The core moving part of the melt pump is the gear assembly. The rotation and meshing of the gear can squeeze the melt between the teeth on one hand, so that the material can be transported from one end to the other. Engagement can close the low pressure chamber, which is beneficial to increase the output pressure. Spur gears and helical gears are easier to manufacture, but spur gears have poor self-cleaning properties, and pressure fluctuations occur at higher speeds. While helical gears overcome the problems of poor self-cleaning and pressure fluctuations, Changzhou vacuum pumps are not working. Avoiding a large axial force, which not only aggravates the wear of the gear shaft and the sliding bearing, the oil-free screw vacuum pump will cause severe shear of the flank gap melt, which affects the quality of the final plastic product. In order to balance the axial force and run smoothly under heavy load conditions, the gear of the optimal structure is a herringbone gear.
At present, the usual practice of processing a herringbone gear assembly is to separately machine two helical gears and one gear shaft. After machining, the two helical gears are simultaneously heated to °C by using the gear wheel and the interference fit of the gear shaft. The specific position of the gear journal is coupled into a herringbone gear assembly by heat shrinkage of the gear. In addition to the load generated by the material conveyed by the melt pump, the pump should be considered to work continuously at high temperatures. The ideal material is forged steel with quenched and tempered heat treatment. In order to improve the wear resistance and fatigue resistance of the gear shaft, improve Its reliability, after machining, should also be treated by salt bath soft nitriding surface. The internal stress of the gear shaft is selected. The combination of the appropriate gear journal and the two helical gears, which is called the herringbone gear wheel, is the key to reduce the internal stress of the gear journal. It is known from the experience that if the interference is insufficient, the pump will produce gear shaft and herringbone gear accuracy during operation, which can save processing costs. The frictional assistance of the journals at both ends of the shaft of the gear shaft at both ends of the gear shaft is generated by the opposite ends of the gear shaft and the respective sliding bearings. If the coupling between the journals at both ends of the gear shaft and the sliding bearing is tight, the gear shaft will be poorly lubricated, resulting in excessive friction, resulting in shortened cleaning pumping life and excessive force on the broken gear shaft. If the cooperation between the two is loose, the life of the sliding bearing is also very short, and the bearing failure will increase the friction of the gear shaft.
In addition to,we also provide high precision machining and precision machined parts,supply custom machining services and cnc machining services for small batch.