When the above situation occurs, please saw the layer of the board under the required depth and raise the saw blade. Then remove the cut outer layer of the block. Draw the AB line at the height of the saw blade on the left vertical board, and attach the dial indicator to the lower edge of the saw blade. Rotate the saw blade to turn the dial indicator to the A and B on the contour line. Point and lift the saw blade to adjust the distance between the two detection points A and B to more than 1m. The difference between the two points should be no more than 0.05mm/1m. If the ratio exceeds the ratio, it should be adjusted. When adjusting, just fix the sawing head and loosen it slightly. Tap the sawing head to make it swing slightly, adjust it to the required position and then lock the bolt. To prevent the position from changing after loosening, It is best to add a positioning pin after the adjustment. If there is already a locating pin, the pin must be removed first, and then drilled and sold after the adjustment.
4, the accuracy of the pad
When the combination saw is equipped with a combination of large and small saw blades, the displacement of the slats requires a high degree of overlap, in addition to the movement distance, the yaw amount of the saw blade, the width error of the cutter head and the deviation of the weld symmetry. And the accuracy of the pad is directly related.
The pad is mostly made of cast iron and aluminum alloy. The aluminum alloy is light, wear-resistant, easy to process, and non-corrosive. It is an ideal pad material, but the price is much higher than that of cast iron. In order to improve the precision, the concave and concave holes of the backing plate should be processed first. Then, the concave hole and the concave surface are positioned to be fixed on the special tooling, and the other concave surface is formed by one clamping, and the inner holes and the outer circle of the two sides are finished. The yaw error of the two sides of the thus processed pad can be controlled within 0.01~0.015mm, the thickness difference is less than 0.02mm, and the precision is high, which reduces the influence of the pad error on the yaw of the saw blade and the overlap of the saw. .
Features should pay attention to the storage of the pad, do not litter and cause scratch damage. Care must be taken to remove dirt from the mating surface during installation to ensure the accuracy of the saw blade installation.
Third, the saw blade installation adjustment
1. Adjustment of a few saw blades
In the whole set of saw blades, the yaw of one, two or several saw blades may be out of tolerance. At this time, the oversized saw blade can be removed, and the rust and stains of the saw blade and the backing plate are removed. The saw blades are reinstalled on the outer end of the cutter shaft (tailstock end) when the saw is removed. If the rotation check is still out of tolerance, the pad between the saw blade and the saw blade can be rotated by a certain angle and then locked for inspection. If the saw blade yaw is too large to be adjusted after repeated rotations, it should be removed for shaping.
2, the entire set of saw blade adjustment
The installation of the combined saw blade sometimes results in the entire set of saw blades being yawed in one direction at the same time. Such a yaw, the horizontal component of the circulation caused by the action of centrifugal force during rotation.
The magnitude of the horizontal component increases as the amount of yaw increases. In severe cases, it causes the lateral swaying vibration of the saw machine, so that it cannot work normally. To this end, we have an adjustment plate on the outer end of the cutter shaft that can adjust the yaw amount of the entire set of saw blades (Fig. 3). The saw blade must be pre-locked during adjustment. The degree of pre-tightening is adjusted by adjusting the adjusting screw on the disc, and the saw blade is not subject to rebound due to looseness. The adjustment should be carried out under the monitoring of the dial indicator. According to the detection of the dial indicator, the point with the largest yaw amount is turned back to the top by adjusting the screw, and the side is adjusted while checking to meet the requirements. Then lock all the adjustment screws, and finally lock the saw blade, and then re-inspection can be put into use. This adjustment method is simple and easy to learn, and can be mastered by ordinary operators. After correct adjustment, the yaw amount of the whole set of saw blades can be controlled within the range of 0.3 to 0.5 mm, and has high precision of use.
3, the installation position of the saw blade
The saw blade is mounted on the cutter shaft and rotates around the center line of the cutter shaft. The dimensional tolerance of the cutter shaft is 100-0.036, and the dimensional tolerance of the saw blade hole is 100+0.066. The clearance between the shaft and the hole varies from 0.048 to 0.137 (see Figure 5). When the saw blade is installed, the cutter shaft stops moving. After the saw blade is loaded, the gap between the saw blade and the cutter shaft appears in the knife. Below the shaft, the center of the saw blade rotating about the tool axis deviates from the center of the saw blade by 0.048 to 0.137 mm. After the saw blade is ground for 1-2 hours, the diamond in the saw blade head is exposed and forms a cutting edge (commonly known as the edge) with the cutter axis as the center of rotation. After the relative position between the saw blades is changed, the direction of the cutting edge is changed due to the change of the center of rotation. Therefore, after installing the saw blade and cutting it, if you need to disassemble the saw blade, be sure to make the bottom dead mark when disassembling. When reinstalling, you must install it according to the mark. Do not change the direction and position of the saw blade. Otherwise, the change in the direction of the cutting edge will affect the efficiency of the sawing and the life of the saw blade.
Fourth, the requirements for the saw blade
1. Requirements for saw blade
The inner hole of the chip should be strictly controlled within the tolerance range. If the inner hole is too small to be tightly attached to the upper shaft, it will cause difficulty in installation and affect the adjustment of the yaw of the saw blade. Due to the high hardness of the sheet, the uneven grinding of the grinding wheel is easy to cause eccentricity. Therefore, it is not possible to evenly enlarge the hole with a semicircular file. It takes time and effort to increase the difficulty for users.
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