1. Slider 2. Mast body 3. Guide screw 4. File 5. Adjusting screw 6. Cover 7. Capping screw 8. Top wire diagram Double-edge adjustable trowel
0 Foreword The φ140mm pin hole of the 500kW shearer has serious wear (maximum deviation is 3mm). In the absence of a trampoline, it was decided to use the existing Z3080 radial drilling machine for keying. Radial drilling machines use ordinary boring tools for boring such a large hole, the torque is large, and the radial resistance due to single-blade keying greatly exceeds the clamping force of the machine tool, leading to the spindle box and arm lock Shake it so that it cannot be cut. In order to solve this problem, according to the force situation of the boring knife when boring, a double-edged adjustable boring burr was designed and manufactured from the improvement of the tool manipulator. Its characteristic is that double-edged boring is used to balance the radial cutting resistance. . The use of good results. 1 The structure of double-edged boring tool and its sharpening and adjustment The double-edged boring tool is composed of the arbor, adjusting tool slider, gland and adjustment screw, as shown in the right figure. The arbor material is 40Cr modulating material. The arbor body is machined with two symmetrical chutes as the tooling grooves. The shank of the arbor is a Morse 5 taper shank. The concentricity of the inner hole of the arbor to the taper shank is 0.01mm, and the clearance gap between the cylindrical adjusting knife slider and the inner hole of the arbor is not more than 0.02mm, and the taper angle of the lower cone part is 40°. The cutter head material adopts 10mm×12mm high-speed steel cutters. When sharpening, the length of the cutter body and the angle of the cutter blade must be exactly the same so as to ensure that the two cutters have higher symmetry after being loaded into the cutter hole. According to the diameter of the stirring hole, turn the adjusting screw to adjust the protruding amount of the cutter head. Trimming adjusts the symmetry of the two tool tips to the center of the boring bar in the range of 0.10 mm, so that when the key knife is in the knife feed, both the left and right blades will eat the knife at the same time. It has been proved that, in the case where the clamping force of the radial drilling machine cannot be increased, the radial cutting resistance is balanced, and the stability of the machine tool is relatively improved. A hole of Ø145 mm is successfully pulled out, and the accuracy of the hole is fully complied with. Technical requirements, in which the cylindricity error is not more than 0.03mm. 2 Notes The key to using this boring tool is to ensure the symmetry of the two blades to the center of the boring bar. Attention should be paid to this from the sharpening to the loading of the boring bar. Forces damage the stability of the bed, and affect the processing accuracy. From the perspective of ensuring the stability of the machine tool, it is only advisable to adopt a low feed rate at the time of boring. The rotation speed and feed rate are 25r/min and 0.04mm/r respectively, and the depth of knife is about 0.5mm. 3 Features The knife edge on both sides of the boring knife is symmetrical to the center of rotation and participates in cutting at the same time. The generated resistance of the feed is balanced symmetrically, in which the radial component forces cancel each other and the main shaft is no longer affected by it and swings left and right. Completely eliminates the single blade boring tool in the boring, the unilateral force of the boring bar, resulting in spindle shaking phenomenon, which is suitable for vertical boring machine mounted on a radial drilling machine. The boring tool head is easy to find, and the radial dimension of the tool head can be fine-tuned and gradually enlarged. It is especially suitable for those boring holes that require only rounding, and the position accuracy is not too high. Because the amount of expansion and contraction of the cutter head can be adjusted, the diameter of the machined hole can be large, and the Ø80 to 150mm hole can be bored, and a certain size of blind hole can also be boring.
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