1. The deformation of the substrate is large, the thickness is inconsistent, and the tolerance of the inner hole is large. When there is a problem with the above-mentioned congenital defects of the substrate, no matter what type of equipment is used, there will be grinding errors. The large deformation of the base body will cause deviations on the two side angles; the inconsistent thickness of the base body will cause deviations in both the relief angle and the rake angle of the blade. If the accumulated tolerance is too large, the quality and accuracy of the saw blade will be seriously affected.
2. The influence of the grinding mechanism on the grinding. The grinding quality of alloy circular saw blades lies in the structure and assembly of the model. At present, there are about two types of models in the market: one is the German Fuermo type. This type adopts vertical grinding pin, the advantages are all hydraulic stepless motion, all feeding systems use V-shaped guide rails and ball screws to work, the grinding head or boom adopts the knife to advance slowly, the knife to retreat quickly, and the clamping cylinder is adjusted. Flexible and reliable metal processing mesh, precise positioning of tooth extraction, firm and automatic centering of saw blade positioning center, arbitrary angle adjustment, reasonable cooling and flushing, realization of man-machine interface, high precision of grinding pins, and rational design of pure grinding machine; At present, the horizontal type, such as Taiwan and Japan models, has gears and mechanical gaps in the mechanical transmission, and the sliding accuracy of the dovetail is poor. Grinding of one center produces large deviation, difficult to control the angle, and it is difficult to ensure the accuracy due to mechanical wear.
3. Welding factors. When welding, the deviation of the alloy alignment is large, which affects the grinding accuracy, resulting in a large pressure on one side of the grinding head and a small pressure on the other side. The clearance angle also produces the above factors, poor welding angle, and human unavoidable factors, all of which affect the grinding wheel and other factors during grinding. have an unavoidable impact.
4. The influence of grinding wheel quality and particle size width. When choosing a grinding wheel to grind the alloy sheet, pay attention to the grain size of the grinding wheel. If the grain size is too coarse, the grinding wheel marks will be produced. The diameter of the grinding wheel and the width and thickness of the grinding wheel are determined according to the length, width and width of the alloy or different tooth shapes and the conditions of each surface of the alloy. It is not the same size of the back angle or the front angle that the grinding wheel can grind different tooth shapes arbitrarily. Specification grinding wheel.
5. Feeding speed of grinding head. The grinding quality of the alloy saw blade is completely determined by the feed speed of the grinding head. Generally, the feed speed of the alloy circular saw blade cannot exceed this value in the range of 0.5 to 6 mm/sec. That is, it should be within 20 teeth per minute, exceeding the value per minute. The 20-tooth feed rate is too large, which will cause serious knife bumps or burn alloys, and the grinding wheel will have convex and concave surfaces, which will affect the grinding accuracy and waste the grinding wheel.
6. The feed of the grinding head and the selection of the grinding wheel particle size are of great significance to the feed. Generally, it is recommended to use 180# to 240# for grinding wheels, and 240# to 280# should not be used, otherwise the feed speed should be adjusted.
7. Grinding heart. All saw blade grinding should be centered on the base, not on the edge of the blade. The plane grinding center cannot be taken out, and the machining center for the rear corner and rake angle cannot be used to sharpen a saw blade. Grinding the three-process saw blade center Can not be ignored. When grinding the side angle, the thickness of the alloy is still carefully observed, and the grinding center changes with the thickness. Regardless of the thickness of the alloy, the center line of the grinding wheel should be kept in a straight line with the welding position when grinding the surface, otherwise the angle difference will affect the cutting.
8. The tooth extraction mechanism cannot be ignored. Regardless of the structure of any gear grinding machine, the accuracy of the tooth extraction coordinates is designed to the quality of the sharpening tool. When adjusting the machine, the tooth extraction needle is pressed at a reasonable position on the tooth surface, and it is extremely important not to move. Flexible and reliable.
9. Clamping mechanism: The clamping mechanism is firm, stable and reliable, and is the main part of the sharpening quality. The clamping mechanism must not be loose at all during sharpening, otherwise the grinding deviation will be seriously out of control.
10. Grinding stroke. Regardless of any part of the saw blade, the grinding stroke of the grinding head is very important. It is generally required that the grinding wheel exceeds the workpiece by 1 mm or withdraws by 1 mm, otherwise the tooth surface will produce two-sided blades.
11. Program selection: There are generally three different program options for sharpening, coarse, fine and grinding, depending on the product requirements, and it is recommended to use the fine grinding program when grinding the rake angle.
12. The quality of coolant grinding depends on the grinding fluid. When grinding, a large amount of tungsten and diamond grinding wheel powder are produced. If the surface of the tool is not washed and the pores of the grinding wheel are not cleaned in time, the surface grinding tool cannot be ground smooth, and the alloy will be burned without sufficient cooling.
Post time: Sep-17-2022