Technical

The working principle of the universal grinder

The universal grinding machine is controlled by a stepless speed regulation system, which can easily adjust the grinding speed suitable for grinding various parts. The closed-loop feedback grinder pressure control is adopted with an electro-pneumatic proportional valve, and the pressure device can be independently regulated. The upper plate is equipped with a slow-down function, which can effectively prevent the breakage of thin and brittle workpieces. Through a time relay and a grinding counter, the grinding time and the number of grinding circles can be accurately set and controlled according to the processing requirements. The pressure mode can be adjusted during work, and when the grinding time or lap speed is reached, it will automatically stop and alarm, realizing semi-automatic operation.

The grinding machine variable speed control method, the grinding process has three stages, namely the initial stage, the formal stage and the end stage. At the beginning of the grinding process, the acceleration of the artificially controlled grinding wheel speed increases from zero to fast. When the grinding wheel speed rises to half of the official grinding speed, an inflection point appears in the acceleration change, and the acceleration of controlling the grinding wheel speed is increased by The maximum value decreases from fast to slow until the rotational speed of the abrasive tool reaches the official grinding speed, and the acceleration of the rotational speed of the abrasive tool of the universal grinder drops to zero.

Using the feature of fixed abrasive grinding, according to the relative motion track density distribution between the workpiece and abrasives, the abrasive density distribution on the abrasives is reasonably designed, so that the wear of the abrasives during the grinding process does not affect the surface accuracy of the abrasives , so as to significantly improve the surface accuracy of the workpiece and avoid the trouble of dressing abrasive tools.

In the plane fixed abrasive grinding, the rotational motion of the abrasive tool is the main motion, and the motion of the workpiece is the auxiliary motion. In most cases, the workpiece is floating and pressed on the grinding tool, and its motion law is unknown. Therefore, it is necessary to analyze the force of the workpiece in order to obtain its force state and motion law. The workpiece is taken as the separation body of the whole grinding system, and the differential equation of the workpiece force balance is established, and the motion law of the workpiece can be obtained by solving the equation.

The main machine of the universal grinder is driven by a speed-regulating motor, equipped with a high-power deceleration system, soft-start, soft-stop, and runs smoothly. Through the upper and lower grinding discs, the sun wheel of the grinding machine, and the star wheel of the grinding machine, the grinding movement in four directions and the speeds are coordinated with each other during processing, so as to achieve the high-efficiency operation of grinding the upper and lower surfaces at the same time. The lower grinding disc can be lifted and lowered to facilitate the loading and unloading of workpieces. Pneumatic sun gear changing device can precisely control the grinding precision and speed of both sides of the workpiece. A correction wheel is randomly equipped to correct the parallel error of the upper and lower grinding discs.