Abstract Car grinding refers to the machining of hardened workpieces using CBN tools or ceramic tools. This new process for car grinding can be used to cut hardened steel, grey cast iron, ductile iron, powder metallurgy and special materials. Of course, there are also some materials such as bronze that are not suitable for use in the car. use...
Car grinding refers to the machining of hardened workpieces using CBN tools or ceramic tools. This new process for car grinding can be used to cut hardened steel, grey cast iron, ductile iron, powder metallurgy and special materials. Of course, there are also some materials such as bronze that are not suitable for use in the car. It can be used for turning, surface machining, tapping, milling, slotting, mold machining and turning cones. According to a report in the United States, the finish of the workpiece is maintained at 16 μm. Under normal conditions, the finish can reach 6-8 μm. At present, the new process of car grinding is being used in many industrial sectors. For example, automobile manufacturers use this method to semi-finish and finish the drive shaft, various shaft drive chains, engines, brake discs and brake rotors. Aircraft manufacturers use this method to manufacture aileron gears and landing gear, and from the oil field to the steel mills everywhere can be seen the application of the car grinding method. Machine tools, tools, heavy trucks, agricultural machinery, medical equipment, can molds, and automotive parts all use the car as an integral part of the production process. The advantages of using the car grinding process:
1. The cost of grinding by car is low, generally only a quarter of grinding;
2. It is not necessary to use special tools, special machinery and fixtures for grinding, but grinding requires the use of grinding machines, which can be carried out on existing NC or CNC turning centers.
3. High productivity, because the cutting speed of the CBN tool is high, which greatly increases the productivity and saves a lot of time.
The integral polycrystalline (FBN) tool developed by Fenike can be controlled to ±0.01mm and the roughness can be controlled below Ra0.8-1.6μm, which reduces the investment in the purchase of grinding equipment. The finishing of all complex shapes shortens the production cycle, dry cutting, energy saving and environmental protection, and successfully realizes the green energy saving and environmental protection “car grinding†processing method, which is widely used in the gear bearing processing industry.
Since the cost of CBN tools has been greatly reduced in recent years, it has created conditions for the promotion and application of the car. Cost is not only the cost of the tool, but the manufacturing cost of each part. With a long tool life and low cost per cutting head, CBN provides the most economical way for hard machining. In addition, in terms of waste disposal and environmental protection, it is better to use grinding instead of grinding. Grinding produces a mixture of wear debris and coolant, which is a waste that cannot be reused and can pollute the environment. The waste generated by the car can be reused, which is especially important for today's environmental protection.
In recent years, the space of the factory has received much attention. Compared with CBN tools, the grinding wheel is relatively large and heavy, so it is difficult to store. The CBN tool is small and can be used for car grinding without having to add a new machine, saving space in the factory.
The rapid development of the car is based on the advancement of CBN tool technology in the past few years. In the early 1990s, it was only possible to choose a few CBN tools for car grinding. At present, the user's choice is 10 times more. Furthermore, the speed is greatly improved. The maximum cutting speed for cast iron in the early 1990s was about 152m/min. The highest cutting speed is now 1524m/min. Most continuous hard steel cutting speeds are 90-150m/min. The amount is 0.05 to 0.2 mm/r, and the depth of cut is 0.1 to 0.5 mm. The applicability of CBN has expanded and it has not been possible for brittle workpieces in the past. Now, workpieces with different hardness can be processed.
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