In order to meet the requirements of manufacturing precision, production efficiency, clean production and improve the quality of gear processing industry, the following development trend of tooth machine and tooth making technology has appeared.
As the machine through the movement of the axis of CNC control and part of the axis between the linkage, has the following advantages:
1) increased the function of the machine, such as hobbing small taper and drum gear, etc. become extremely simple.
2) shorten the transmission chain, while the use of semi-closed-loop or closed-loop control, through the NC compensation can improve the positioning accuracy of each axis and repeat the positioning accuracy, thereby improving the machining accuracy and Cp value, increased machine reliability.
3) For the variety, due to the need to calculate and replace the tooth wheel and differential wheel, feed and spindle shift time, the gear machine also eliminates the need for changing the timing of the guide rail, thus reducing the auxiliary processing Time, increased the flexibility of the machine.
4) As the mechanical structure becomes simple, can be designed to be more conducive to improve the rigidity of the machine and the thermal deformation to the bottom.
5) There is no mechanical connection between the shafts, structural design has become typical, more conducive to the implementation of modular design and manufacturing.
Gear machining machines such as hobbing machines, gear shaper and high speed of the grinding machine mainly refers to the machine has a high tool spindle speed and high table speed, they are the main indicators to improve the cutting efficiency. Conventional mechanical hobbing machine hob spindle speed is usually up to 500r / min, table speed up to 32r / min. Metal processing micro letter, the content is good, worthy of attention. With the improvement of the gear machining tool performance, the high speed and efficient cutting of the gear machining machine has been developed rapidly and mature. The gear hobbing cutting speed has been increased from 100m / min to 500 ~ 600m / min, the cutting feed speed is from 3 ~ 4mm / r to 20mm / r, which makes the maximum speed of the hobbing machine spindle up to 5500r / min, the maximum speed of the table up to 800r / min, machine parts moving speed is also up to 10m / min; high-power spindle system allows the machine can use diameter and The length of the grinding wheel are grinding, is conducive to increasing the wheel life, but also help the operator to choose the best grinding parameters to complete the grinding process.
As a result of the use of high precision, with preloaded high-rigidity linear guide, ball screw, rolling bearing, spindle, torque motor and CNC technology, high-speed machining conditions under the gear machining machine accuracy is guaranteed and improved. Electric spindle accuracy is generally radial vibration 0.002mm, axial 0.001mm; ring torque servo motor positioning accuracy of 0.5 ", repeat positioning accuracy of 0.01"; linear motion axis positioning accuracy of less than 0.008mm, repeat positioning accuracy of less than 0.005 mm. Hobbing and gear teeth, although rough, but in high-speed cutting conditions can still achieve DIN 6 ~ 7 precision, for the subsequent finishing process to obtain high accuracy to provide a guarantee. With the increase in the production efficiency of the grinding machine, the reduction of the cost of the single gear grinding and the constant pursuit of the accuracy of the gears of the automobile gears, the demand for the grinding machine is increasing. At the same time, with the development of numerical control technology, The extension of the machine tool is easier to implement. Therefore, in the fierce market competition pressure, the world's major manufacturers of tooth-making machine manufacturers have joined the production of grinding machine as the representative of the gear finishing machine ranks. The development of this trend will make the future of automotive gear processing more and more rolling - grinding process.
Function compound machine tool is in a machine or a workpiece in a clamping, you can complete multi-channel process processing, thereby improving the workpiece processing efficiency and even accuracy.
Cutting fluid during cutting can improve tool life, improve the quality of the surface and facilitate the discharge of cutting heat without causing thermal deformation of the machine. However, in the high-speed cutting process, the splashing of the cutting fluid and the formation of the oil mist are particularly harmful to the ecological environment, especially the health of the operator. To this end, the processing zone is usually enclosed with a shroud, So that the discharge is only non-oil fog, and cutting oil is re-flow back to the machine recycling. But this can not fundamentally solve the environmental problems, because the replacement of modified cutting fluid will seriously pollute the environment, wet gear processing consumption of cutting fluid and cutting fluid attached to the cost of processing costs accounted for about 20% of the use of high-speed dry Cutting can improve the processing efficiency of more than 2 to 3 times, the tool life is wet cutting 2 to 5 times, therefore, dry cutting reduces the cost of processing a single gear. Metal processing micro letter, the content is good, worthy of attention. High-speed dry cutting can reduce the consumption of cutting fluid and cooling treatment equipment, but also to avoid pollution to the environment, but also improve production efficiency and reduce the cost of manufacturing a single gear.
Digital control technology, sensor technology, information technology and network control technology together, so that the level of intelligent CNC machining machine tool higher. Gearing machine to achieve the error compensation, temperature compensation, automatic balance, collision prevention function, overload protection, with or without automatic identification of the workpiece, the workpiece is correct, the workpiece has been processed, the tooth meshing, processing allowance distribution, tool wear Automatic detection, automatic repair grinding wheel, zero programming interface, multi-function processing software, cutting technology expert system, robot in the machine between the workpiece when the automatic identification, remote control, remote diagnosis and other functions, although the intelligent machine tool is improved Safety, stability, complex parts processing, precision machining and the realization of unmanned production base, but also will continue to improve and improve.