What are the requirements for ultra-hard abrasive grinding for precision parts machining? In fact, superabrasive grinding wheels in precision parts machining put forward some requirements for grinding machines, and it is best to grind on superabrasive grinding wheel grinders. The requirements of superhard abrasive grinding wheel for grinding machines include the following aspects.
1、The grinding machine should have high precision. The radial circular runout should be <;0.001mm and the axial circular runout should be <;0.005mm, and the spindle bearings are mostly dynamic-static pressure bearings or dynamic-static pressure combination bearings, or static pressure bearings, to ensure the precision parts processing accuracy required for precision grinding.
2. The grinding machine must have sufficient stiffness, high stability and low vibration. The stiffness of the machine tool will affect the stability and vibration resistance of the grinding process, which in turn affects the durability and service life of the superhard grinding wheel, as well as the grinding quality. Generally speaking, the stiffness of the machine tool is required to be about 50% higher than that of an ordinary grinding machine; stiffness.
3. It is required to have a good feeding system with high precision, uniform and stable speed, wide speed range, high speed to ensure the productivity requirements and low speed to ensure the grinding size, shape accuracy and surface roughness requirements. Usually, the minimum longitudinal feed speed should be 0.lm/min or less, and the minimum transverse feed speed (grinding depth) should be 0.001-0.0005mm/8t (st^ single-stroke). For grinding with micronized grinding wheels, the match between the transverse feed speed of the grinder and the size of the grinding grain should be considered.
4. Consideration should be given to the dressing of superabrasive grinding wheels. Superabrasive wheel dressing will involve some special devices, working fluids and dressing parameters required, which will enable the machine tool to be reassembled.
5, precision parts processing machine tools of all moving parts, such as the rotating part of the spindle and the feed motion guide, should be reliably sealed to prevent the entry of super hard abrasives to cause severe wear.
6、Enter to cause serious wear. There should be a perfect grinding working fluid treatment system to ensure that the grinding working fluid is clean and functional and does not affect the roughness of the machined surface to prevent unclean grinding working beans from wearing the moving parts of the machine tool.
7. The grinding of super-hard abrasive grinding wheels requires small vibration, and the machine tool should be placed on an anti-vibration foundation, and corresponding anti-vibration vibration isolation measures should be taken. Such as grinding wheels should be finely trimmed and balanced, and anti-vibration pads should be added at the contact between the machine tool and the ground.