1. CNC grinding wheel dresser
The rapid development of forming grinding wheel gear grinder is inseparable from the development and application of CNC grinding wheel dressing technology; The application of CNC grinding wheel dresser greatly improves the precision of grinding wheel tooth profile dressing, realizes the precision grinding of gear by forming grinding method, and further promotes the development of forming grinding machine. CNC grinding wheel dresser generally uses diamond pen or diamond roller as dressing tool. When dressing with diamond pen, it is necessary to constantly adjust the inclination angle of diamond pen to adapt to the normal vector of the dressing surface, which is complicated in motion control and low in dressing efficiency. In addition, the point contact dressing of diamond pen makes the tip diamond easy to wear, and the wear amount is irregular and difficult to compensate, which has a great influence on the dressing accuracy of grinding wheel. Because there are many disadvantages in dressing the formed grinding wheel with diamond pen, most modern CNC grinding wheel dressers use diamond rollers as dressing tools. When dressing the nonlinear complex profile of diamond roller, it can not only dress the grinding wheel profile with high precision, but also has high working efficiency, long service life and convenient operation.
2. The pitch deviation of the circumferential precision gear
mainly comes from the rotary error of the machine tool spindle, the error of the process method during gear grinding and the error of the indexing system, among which the error of the indexing system has the greatest influence. In order to improve the grinding accuracy of the gear grinding machine with forming grinding wheel, it is necessary to make the gear grinding machine achieve circumferential precision indexing. With the gradual maturity of high-precision, hard-tooth-surface and backlash-free worm gear pair technology, the popularization of numerical control technology in the rotary motion of gear grinding machine, the practicality of torque servo motor and the improvement of high-precision rotary encoder technology and rotary motion detection feedback control technology, the circumferential precision tooth separation technology of gear grinding machine has a broader room for improvement.
At present, the control accuracy of circumferential tooth separation can be 2 ",which meets the requirements of high-precision grinding for tooth separation accuracy. In recent years, the following achievements have been made in the circumferential precision tooth separation technology of forming gear grinding machine in China. First, Dalian University of Technology applied the multi-tooth indexing disc technology to the indexing system of gear grinding machine, and achieved good experimental results. The circumferential tooth separation accuracy of 1 ″ ~ 3 ″ can meet the requirements of high-precision gear forming gear grinding machine. This technology has applied for the invention patent "High-precision automatic indexing device for end teeth of gear grinding machine". Second, Chen Lixin invented the "automatic backlash-eliminating drive indexing table of gear grinding machine". The innovation of the invention lies in the adoption of double worm and worm wheel indexing, which realizes that the contact gap between the driven worm and worm wheel is always zero, and effectively improves the tooth separation accuracy. Thirdly, in order to reduce the indexing error in gear form grinding, Jiangsu University and Henan University of Science and Technology put forward the indexing error compensation technology for gear form grinding. This technology points out that under the condition of not changing the structure and manufacturing accuracy of the machine tool, the spatial position error in the machining process is detected in real time through the position detection device, and the error is fed back to the control system of the machine tool. By modifying the ideal numerical control instruction, the machining positioning accuracy of the machine tool is improved and the error is effectively compensated.