Analysis on the development trend of gear processing technology and equipment
Uvc Light,T5 Uvc Lamp,T5 Uvc Tube,T5 Uvc Bulb Changxing leboom lighting product CO.Ltd. , https://www.leboomuvd.com
In order to meet the requirements of the gear processing industry for manufacturing precision, production efficiency, clean production and quality improvement, the following development trends have emerged in the gear making machine and tooth making technology.
1, CNC
Since the CNC control of each motion axis of the machine tool and the linkage between some of the axes are achieved, the following advantages are obtained:
1) It has become extremely simple to increase the functions of the machine tool, such as hobbing small taper and drum gear.
2) Shorten the transmission chain. At the same time, after adopting semi-closed loop or full closed-loop control, the numerical control compensation can improve the positioning accuracy and repeat positioning accuracy of each axis, thereby improving the machining accuracy and Cp value of the machine tool and increasing the reliability of the machine tool.
3) When changing the variety, the time of calculating and changing the tooth hanging wheel and the differential hanging wheel, the feed and the spindle shifting are omitted, the gear shaping machine also saves the time for changing the inclined rail, thereby reducing the auxiliary processing. Time increases the flexibility of the machine.
4) Since the mechanical structure is simple, it can be designed to improve the rigidity of the machine tool and reduce the thermal deformation to the bottom.
5) There is no mechanical connection between the shafts, and the structural design becomes typical, which is more conducive to the implementation of modular design and manufacturing.
2, high speed and efficiency
The high speed of gear processing machines such as gear hobbing machines, gear shaping machines and gear grinding machines mainly means that the machine tools have high tool spindle speed and high table speed, which are the main indicators for improving cutting efficiency. Conventional gear hobbing machines typically have a hob spindle speed of up to 500 r/min and a table speed of up to 32 r/min. With the improvement of the performance of gear processing tools, the high-speed and high-efficiency cutting of gear processing machines has been rapidly developed and matured. The cutting speed of gear hobbing has been developed from 100m/min to 500-600m/min, and the cutting feed rate is from 3 to 4mm/ r develops to 20mm/r, which makes the maximum speed of the hobbing machine spindle reach 5500r/min, the maximum speed of the table can reach 800r/min, and the moving speed of the machine parts is up to 10m/min. The high-power spindle system enables the machine to use the diameter and Grinding of grinding wheels with large lengths is beneficial to increase the life of the grinding wheel, and it is also beneficial for the operator to select the optimal grinding parameters to complete the grinding process.
3, high precision
Thanks to the high-precision, pre-loaded high-rigidity linear guides, ball screws, rolling bearings, electric spindles, torque motors and CNC technology, the precision of gear processing machines under high-speed machining conditions is guaranteed and improved. The accuracy of the electric spindle is generally 0.002mm for radial runout and 0.001mm for axial direction; the positioning accuracy of the ring torque servo motor is 0.5", and the repeat positioning accuracy is 0.01"; the positioning accuracy of the linear motion axis is less than 0.008mm, and the repeat positioning accuracy is less than 0.005. Mm. Metal processing WeChat, the content is good, it is worthy of attention. Although hobbing and gear shaping are rough machining, they can still achieve DIN 6 to 7 accuracy under high-speed cutting conditions, which guarantees high precision for the subsequent finishing process. With the improvement of the production efficiency of gear grinding machines, the reduction of the cost of single gear grinding, and the constant pursuit of precision in automotive gears, the demand for gear grinding machines is increasing. At the same time, with the development of numerical control technology, each The functional extension between machine tools is easier to implement. Therefore, under the pressure of fierce market competition, the world's major dental machine tool manufacturers have joined the ranks of gear finishing machines represented by gear grinding machines. The development of this trend will make the rolling gear grinding process more and more in the future automotive gear processing.
4, functional composite
The function compound type machine tool means that the machining process can be completed in one machine or in one time, so that the machining efficiency and accuracy of the workpiece can be improved.
5, green environmental protection
The use of cutting fluid during the cutting process can improve tool life, improve the quality of the machined surface and facilitate the discharge of cutting heat without causing thermal deformation of the machine tool. However, the splashing of the cutting fluid and the formation of the oil mist during the high-speed cutting process are particularly harmful to the ecological environment, especially the health of the operator. For this reason, the processing zone is usually closed with a shield and an oil mist separator is installed. The only discharge is the oil-free mist, and the cutting oil is recirculated back to the machine for recycling. However, this does not fundamentally solve the environmental problem, because the replacement of the deteriorated cutting fluid will seriously pollute the environment. The cost of the cutting fluid and the cutting fluid attachment device consumed in the wet gear processing accounts for about 20% of the processing cost, and the high-speed dry type is adopted. Cutting can increase the processing efficiency by 2 to 3 times, and the service life of the tool is 2 to 5 times that of wet cutting. Therefore, dry cutting reduces the processing cost of a single gear. High-speed dry cutting not only reduces cutting fluid consumption and cooling processing equipment, but also avoids environmental pollution, improves production efficiency, and reduces the manufacturing cost of a single gear.
6, intelligent
The combination of digital control technology, sensor technology, information technology and network control technology makes the CNC gear processing machine more intelligent. Gear processing machine tools should realize error compensation, temperature compensation, automatic balance, anti-collision function, overload protection, automatic identification of workpieces, correct clamping of workpieces, machining of workpieces, tooth engagement, machining allowance, tool wear , on-line precision inspection, automatic dressing grinding wheel, zero programming interface, multi-function machining software, cutting process expert system, automatic identification, remote control, remote diagnosis and other functions when the robot moves the workpiece between machine tools, although the intelligence is the gear machine tool to improve reliability The foundations of sex, safety, stability, complex parts processing, precision machining and unmanned production, but will continue to improve and improve.