Microcomputer processing of straightness error data of machine tool guides Huang Jingfei, Changshu College. 21 permission summary, this article pays for the fleet guide rail line right 5 to discuss and dare to bury the method analysis. Quickly learn to build a school and program. A preliminary discussion was made on the straight line error data of the guide rails. The experimenter simply enters the test data keyboard. On the screen, the following operation result error curve can be displayed. The minimum tolerance of the line guide is 殳1 meter. For progress. Provide a basis for repairing the machine tool.
In production plus. Machine Song guide line error, which affects the processing quality of the parts. Pass the guide rails. The steam line is accurate and the data is processed. Sticky rails are ground. The measuring method of the guide rail of the machine tool can be effectively improved. The measurement of the straightness of the machine guide rail can be divided into the horizontal plane of the guide rail and the misalignment of the guide rail in the straight plane. The in-plane measurement is usually performed by the steel wire method, by microscope or micrometer. Read the measurement results directly. It is a direct sense method.
(2) There are many methods for measuring in the vertical plane, such as the leveling method, the collimator method, and the self-collimation method. The method of horizontal leveling and self-collimation is widely used in the sub-factory laboratory. Measurement of machine tool guides. The equal-span first-end grounding leveling method is to place the bridge plate with the level gauge on the rail to be tested, and the spanning head and the tail are grounded to the bridge deck to measure the inclination of the adjacent two points of the measured rail relative to the horizontal plane. Angle, and read according to the principle of error reading direction.
The self-collimator method places the bridge of the intrinsic mirror on the track to be tested, etc. The span of the first-level grounding drag bridge is used to measure the tilt angle of the adjacent two-point line of the measured rail relative to the optical axis, and according to the error Read the direction unchanged principle reading.
3 For solving, the length of the guide rail is the abscissa, the number of readings by the level method or the self-collimator method is the ordinate, and the reading position of the starting level is used as the starting point. The rest of the readings from the origin of the coordinate line are before. The end point of the line segment of the reading is used as the starting point. Draw the corresponding line segment. The curve composed of the broken line segments is the straightness error curve of the guide rail in the vertical plane.
2 The evaluation method is relatively simple. In the engineering sense, the error value of the evaluation has its combination of ± rigor and practicability. The error value of the linearity determined by the small floating domain method 1 is the smallest, and the conceptual concept of tolerance and tolerance Therefore, the process of solving the error value is slightly more complicated than the two methods. It is proved that the minimum inclusive area method is more mature. When using the microcomputer to process the straightness error data, the two-point line connection or the minimum multiplication center line is used as the initial condition for solving the minimum area, and then the containment area is solved according to the minimum containment area discrimination method. The width of the area is the straightness error.
3 Mathematical modeling to solve the minimum containment area In the factory laboratory, the level auto-collimator is often used, the guide rail is measured by the cargo distance measurement method, and the data processing is performed by the solution method. For each test, the straightness error in a given plane is drawn. Curves and calculation errors are not only cumbersome but also less accurate.
According to the interphase criterion, it is required to find the high, low, high, low, high and low phase points on the error curve of the tested rail. Firstly, the first and last two points of the curve are connected as a straight line as the reference for calculation, that is, the calculation reference is made. 1 The coordinates of the first point are the parent recognition 7, 3, and the last point coordinates are the factory B. B. Then, the linear equation of the 1st calculation is the linearity error curve in the vertical plane of the guide rail. 2 minimum multiplication. 3 minimum containment area method. The minimum containment area method uses the minimum area line as the method of assessing the baseline, and the error of the straightness is the width of the minimum containment area. The discriminating method is that in a given plane, when the actual straight line is accommodated by two parallel straight lines, the phase-to-phase criterion of the high-low, low-high or low-level phase-to-point contact form is obtained.
The calculated L-wave measurement guide degree 7 and the vertical coordinate value of the first point on the curve; in the evaluation method of the straightness error curve, the two-point point connection method has the advantages of being intuitive and simple, but the precision is low; the minimum bridge length Set the number of pitches included in the error of Qiu MLn, and compare the 7 bits of each point. Get one, the fire value is set to the high point. And set a small point to set the lowest point. Find the two highest points or two lowest points according to the low or low principle. The point number is set to the corpse and the two parallel lines are made. When the curve is high and low, the two parallel straight line equations are when the curve is low and low, the two parallel straight line equations are L, J = and then the following inequalities are used to determine whether each point falls within the area enclosed by the two parallel straight lines.
If the above inequality is satisfied, the straightness error value can be calculated. If the curve is high or low, the error value is if the curve is low or low, and if the error value is outside the two parallel straight lines, replace the highest point or the lowest point on the same side with the point, and then make a new parallel line. Repeat the above calculations to compare the measures. The error data within the length range is processed up to the area where the line is two straight lines.
4 Main program box 2 does not explain 1 subroutine 1 is used to determine whether the tolerance curve of the error curve meets the minimum tolerance principle, ie high, low, high, low, high and low phase criterion; 2 subroutine 2 is used to calculate the straightness error value; subroutine 34 respectively Used for error curve inclusion line drawing.
The specific program can be compiled in 8 languages ​​or 610 languages.
5 For example, the total length of a machine tool rail is 230, and the level is read every 25 times. The data level meter reads as follows 2, 3, 2, 13.22. Find the full length of the guide rail and the operation result of any length of 1 meter. 3. Make the 3 line clear. Concise, tolerant line. The straightness error value on the full length and any length of 1 m is indicated on the top.
Industry published seven lW7.8 3 Tan Haoqiang. , 00 to 310 languages. Beijing 1999 Received 200010 6800 Hydraulic Automatic Ceramic Press Machine Shandong Dongfeng Motor Factory developed a new type of 16800 full liquid ceramic automatic brick press which can replace imported products with similar products in the field, alleviating the current domestic such The contradiction between supply and demand of products.
The machine is controlled by a programmable controller, and has 0 Chinese information data processing and fault self-diagnosis system. The device can visually display the pressure thickness and temperature cycle count production and total output of the pressed brick blank, and has the advantages of high production efficiency, stable working stability, convenient operation and high brick strength.
If Hu Zhenglong can't find the minimum containment area if the curve is high or low, he will solve it with low and low conditions. vice versa. The above error curve
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