Calibration of cutter head and frame of the hottes

2022-08-08
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Correction of cutter head and frame of end milling machine

in the manufacturing and production of steel structure, the production and installation of columns are the most important, which can affect the installation quality of the whole steel frame. Because it is the main load-bearing structure, the installation of columns must meet strict accuracy requirements. Therefore, there are strict process requirements for the processing of end faces of columns. If 75% of the area of the ends of two columns cannot be ensured to be close, the installation accuracy requirements cannot be met, It is necessary to calibrate the milling machine regularly to meet the requirements of end face processing

1. Correction of cutter head

1.1 use of frame level

as a pilot project

1.1.1 working principle when the level tilts, the bubble of the level bubble moves to the rising end of the level

due to the different curvature radii of the inner wall of the leveling bubble, different graduation values are generated

1.1.2 instrument usage level is mainly used to test the straightness and flatness of guide rails of various machine tools and other types of equipment, as well as the levelness and verticality of equipment installation

1.1.3 instrument specification frame level specification: 100, 150, 200, 250, 300mm division value: 0.02--0.10mm/m

1.1.4 instrument structure level is mainly composed of the main body

leveling bubble system and adjustment mechanism. The main body is used for measuring the base level, the leveling bubble system is used for reading, and the adjusting mechanism is used for adjusting the zero position of the level

1.1.5 use the method to make the working surface of the level close to the measured surface when measuring, and the reading can be carried out after the bubble is completely static. The graduation value of the level is an inclination value based on one meter. In order to avoid the measurement error caused by the inaccurate zero position of the level, the zero position of the level must be calibrated or adjusted before use. Adjust the zero position of the level. Put the level on a stable and roughly horizontal flat plate or machine tool guide rail. After the bubble is stable, read at one end, such as the left end, and set it to zero. Then turn the level 180 degrees and put it on the original position of the plate. After the bubble is stable, still read a grid at the left end of the original end. Then the zero position error of the level is half. Carbon nanotubes have a grid of high thermal conductivity. If the zero position error exceeds the allowable range, adjust the adjusting screw or nut of the zero position adjusting mechanism of the level to reduce the zero position error to within the allowable value. For screws that are not regulated to be adjusted, the nuts shall not be screwed at will. Before adjustment, the working surface of the level and the flat plate must be wiped clean, and the screws or nuts and other parts must be tightened after adjustment

1.2 measure the cutter head with a frame level

1.2.1 relationship conversion

working principle of the level gauge the level tube of the level gauge is made of glass, the inner wall of the level tube is a curved surface with a certain radius of curvature, and the tube is filled with liquid. When the level gauge tilts, the bubbles in the level tube move to the rising end of the level gauge, so as to determine the position of the horizontal plane. When the level is close to the cutter head, the bubble direction of the level is opposite to the tilt direction of the cutter head

1.2.3 measure the tilt value of the cutterhead

the values and offset directions shown above show that the cutterhead has deformation in the above four directions, but the overall deformation is small. Only select the maximum offset value for adjustment. If the offset value of the cutter head in several directions is too large and the directions are different, it is difficult to carry out the actual adjustment, because the cutter head has been seriously deformed, it is necessary to consider replacing the cutter head, and pay attention to the feed amount and speed when operating the milling machine in the future

1.2.4 correct the cutterhead according to the tilt amount and tilt direction of the cutterhead. Through the analysis of the maximum value 28 recorded above, it can be seen that the cutterhead has tilted, and the tilt direction of the cutterhead can also be judged. Therefore, it is necessary to adjust the cutterhead to eliminate the maximum tilt value. The method is to loosen the bolts of the gear box part of the cutter body, and insert a copper adjusting gasket at the lower part in the opposite direction of inclination. The thickness of the gasket is half of the maximum value. That is, 28/2=14 companies. After inserting the gasket, tighten the bolt, and then measure and adjust with a level again according to the above method until the offset in the selected four directions is guaranteed to be within 10 divisions. At this time, the cutter base of the end milling machine is adjusted

2. Correction of milling machine frame

2.1 correction of horizontal direction of milling machine frame crossbeam

the correction method is to use a level gauge to read the ruler near both ends of the frame crossbeam. The ruler adopts the same value, record the upper and lower offsets of both ends of each crossbeam, and then fill and adjust the crossbeam to ensure that the crossbeam meets the requirements in the horizontal direction

2.2 adjustment of the workpiece close to the side of the shelf

according to the process requirements, the distance between the vertical line of the center line on the wing plate and the machined end face must be checked during the milling process. The distance between the two ends of the machined surface and the vertical line of the center line of the above wing plate must be equal, and the error is not greater than 0.5mm. If the error is too large, it must be adjusted at any time

the cutter body has been calibrated above, and the milling machine is fixed on the ground, that is, its travel path is fixed. If there is too much error, what needs to be adjusted is the adjustment of the workpiece carrier. The method of measuring the error is as follows:

1. Draw the center line from the webs at both ends of the column, and snap the center line of the flange

for example,

2, draw the vertical lines of the center line at a distance of approximately -100--500mm from the end faces on both sides

3. Measure the length of its diagonal. If the deviation is within 1mm, it meets the actual requirements. If it is greater than 1mm, re find the vertical line

4. Fix the scoring needle on the cutter head, start the milling machine so that the scoring needle has drawn a vertical line along one side of the column, and then compare its coincidence with the previous vertical line. If it is less than 0.5mm, it meets the requirements. If it is greater than 0.5mm, it should be adjusted

5. As shown in the figure, the workpiece is against the end face of the milling machine frame. In practice, according to the principle that two points form a line, the column is mainly against the two points of the frame and ab. Because the milling machine is fixed on the ground and its walking track is the social practice of a fixed testing machine, it is necessary to adjust the end face of the rack. It can be seen from the figure that in order to make the vertical line of the center line coincide with the trace of the scriber, point a should be adjusted along the direction shown in the figure, and the frame is also fixed, so it is necessary to adjust the welded iron plate on the contact surface between the frame and the workpiece at point a. Re feed the knife until it completely overlaps

the above methods introduce the adjustment of tool body and end milling support in turn. Through the adjustment of the cutter body, the verticality between the end face of the column web direction and the horizontal plane after end milling is ensured. Through the adjustment of the end face of the end milling support, the verticality between the end face of the column flange direction and the horizontal plane after end milling is ensured. Through the adjustment of the horizontal direction of the beam of the end milling support at the same elevation, the processing workpiece is ensured to be on the horizontal plane, So as to ensure the perpendicularity between the end face in the web direction of the end milling column and the water

plane. Therefore, after adjusting the above aspects, the end milling machine can ensure that the end face fitting rate of the processed column can reach more than 75% on site, and can meet the installation quality requirements

in the actual production of the workshop, it is generally required to calibrate every half a month, which is also a link of workshop quality control. Only by ensuring the precision of machining tools can we ensure the qualified rate of products

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