Glass processing tools need to deal with the high hardness and low toughness characteristics of brittle materials, and their cutting edge accuracy and sharpness directly affect the processing quality. When using a tool grinder to grind glass processing tools, it is necessary to combine the special characteristics of the tool material and grinding process, and adopt targeted technical means to ensure the grinding effect.
Glass processing tools are often made of diamond or cubic boron nitride materials, and the core of grinding is to maintain the micro integrity of the cutting edge. The selection of grinding wheel for tool grinding machine should match the characteristics of the tool material: bronze bonding agent grinding wheel is suitable for grinding natural diamond tools, which has moderate grinding efficiency and is not easy to cause edge cracking; Cubic boron nitride cutting tools are suitable for resin bonded grinding wheels, which can reduce thermal damage to the cutting edge through flexible grinding. The grain size of the grinding wheel needs to be adjusted according to the precision requirements of the cutting tool. During the rough grinding stage, an 80-120 mesh grinding wheel is used to quickly remove excess, while during the fine grinding stage, a 200-400 mesh grinding wheel is used to ensure the roughness of the cutting edge.
The optimization of clamping method is the foundation of grinding accuracy. For the commonly used circular blade of glass knives, a special fixture is required to achieve radial positioning, and the effect of blade warping is eliminated through three-point support. The contact area between the fixture and the blade should be covered with a copper sheet to avoid crushing the blade body. For glass milling cutters with handles, the top hole positioning system of the tool grinder should be used to ensure the coaxiality of the tool axis and the grinding wheel spindle. After clamping, the radial runout should be detected by a dial gauge and controlled within 0.005mm before grinding can be carried out.
The matching of grinding parameters directly affects the quality of grinding. The linear speed of the grinding wheel should be controlled between 15-25m/s, as excessive speed can cause the tool edge to overheat and produce microcracks; The feed rate needs to be adjusted in a stepped manner, with a slight feed rate of 0.002-0.005mm/r during the initial contact stage to avoid impact, and can be increased to 0.01-0.02mm/r during the stable grinding stage. The cooling system needs to adopt high-pressure atomization cooling method to accurately spray cutting fluid into the grinding contact area, and the flow control should cover the grinding point to prevent glass powder from adhering and affecting the grinding accuracy.
The inspection and correction of blade quality are indispensable. After the grinding is completed, observe the blade morphology through a tool microscope to ensure that there are no broken edges or serrated defects; Use a laser caliper to detect the diameter size of the cutting tool, and the deviation from the standard value should be controlled within ± 0.01mm. If minor defects are found on the cutting edge, a wool wheel can be used for 5-10 seconds of polishing treatment, which can remove burrs without affecting the cutting edge angle.
Through the collaborative cooperation of grinding wheel matching, precise clamping, parameter optimization, and quality inspection, the tool grinder can effectively restore the cutting performance of glass processing tools, extend the service life of tools, and provide reliable tool guarantee for precision glass processing.