Question 1: What are the three coordinates? Coordinate measuring machine is a geometric measuring instrument. Its basic principle is to put the measured part into its allowed measurement space, accurately measure the three coordinate values of the measured points on the measured elements, and process the data of these points by computer to fit the relevant geometric elements, such as circles, spheres, cylinders, cones, surfaces and so on. And geometric data such as shape and position tolerance are obtained through mathematical calculation. Coordinate measuring machine is a universal three-dimensional length measuring instrument, which consists of three perpendicular measuring axes and their respective length measuring systems. It is the main component of coordinate measurement system, which consists of probe system, control system, data acquisition system and computer system. When measuring, the measured part is placed in the measuring space of the measuring machine, and the sensor, that is, the probe, is driven by the machine motion system, aiming at the measured point at any position in the measuring space. When aiming is realized, the probe sends out a reading signal, and the geometric coordinate values of the measured points can be obtained through the measuring system. According to the spatial coordinate values of these points, we can get the geometric size and mutual position relationship to be measured through mathematical operation!

Question: What are the characteristics of CMM?

As a kind of high-precision general measuring equipment, CMM has been used for decades, and it has been more and more widely used in industrial production, and has been paid more and more attention by manufacturers. The introduction of CAD function in CMM software pushes the application field and ease of use of CMM to a new height. Taking the measurement scheme of CMM as an example, this paper briefly introduces the application of CAD in CMM.

1, virtual measurement Virtual measurement is to measure the CAD model in the software without the actual workpiece. Rational dmis measurement software has powerful CAD function. When virtual measurement is needed, open the software, select the offline working mode, then import the CAD model to be measured, and measure by corresponding the CAD model to the selected coordinate system. According to the geometric elements to be measured, click the position of the point to be taken on the CAD model with the mouse, and the position and vector direction of the point to be taken will be displayed on the CAD model. According to the needs of measuring geometric features, multiple sampling points can be carried out. When the required number of points are collected, the midpoint is determined in the sampling window, and the system will drive the virtual probe to collect points, and draw the geometric elements to be measured and their graphics. Virtual measurement can determine various dimensional parameters of CAD model through measurement without dimensional data. But this is not the main purpose of virtual measurement. The main function of virtual measurement is to provide programming service for automatic measurement in offline state.

2. Off-line programming of CNC CMM improves the efficiency of batch measurement. By programming the measurement of a given workpiece, full-automatic rapid measurement can be realized. Before the introduction of CAD function in CMM software, the preparation of measurement program needs professionals to prepare corresponding drawings. This programming method is more complicated to use and requires higher operators. One method is to use the self-learning programming function of three-coordinate measuring software to automatically generate the measuring program while actually measuring the workpiece. When the same workpiece is measured again, the program can be called for automatic measurement. This method is widely used in industry because of its simplicity and wide adaptability. However, because this kind of programming can't be divorced from the actual workpiece, it also brings many insurmountable shortcomings. First, because programming is inseparable from the hardware environment, it is necessary to turn on the gas source of the measuring machine before programming, so that the measuring machine can run normally, and it is complicated to compile. Second, programming is inseparable from the starting parts, and it needs to wait until the parts are processed, which will reduce work efficiency and affect production. After introducing CAD function into coordinate machine measurement software, the process of self-learning programming can be completed by offline virtual measurement of CAD model, thus solving the above problems. No matter whether it is produced or not, as long as the CAD drawing files designed by the design department are input into the measurement software, programming can be carried out. When the workpiece is processed, it can be measured by program, which greatly improves the production efficiency. The specific method is to open the CAD model of the workpiece to be measured in the three-coordinate measuring software, then open the self-learning function of the measuring program, and then simulate the measurement of the workpiece after establishing the coordinate system. The system will automatically generate the measurement program. After the program is compiled, you can also call the program to simulate measurement in CAD environment, verify the program, find out the wrong measurement path and sampling point in the running process, and correct the program, so as to minimize the possible problems in actual measurement and ensure the safety in the measurement process to the greatest extent.

3. Making the evaluation of positional tolerance more convenient In the past three-coordinate measuring software, to evaluate the positional tolerance of geometric elements, it was necessary to manually input the theoretical position of geometric elements and then compare it with the actual measured value, which was very inconvenient for the evaluation of positional tolerance. By introducing CAD function into CMM software, CAD model can be measured in the software. Because the model is designed, the measured value is not only the theoretical value of geometrical features. After the theoretical value is obtained, the actual workpiece is measured in the corresponding coordinate system to obtain the actual value of the required geometric elements. In this way, the position tolerance of the measured geometric elements can be evaluated. In use, this not only saves the trouble of manually inputting the theoretical values of geometric elements one by one, but also avoids changing the coordinate system frequently in order to correspond to the dimensions marked on the drawings. This greatly reduces the labor intensity of operators and ... >>

Question 3: What is the software installed in the three-coordinate digital-analog detection? After importing CAD digital model, after the rough coordinate system and digital model coordinate system overlap, click CMM directly on the digital model to realize a tactile feature detection method.

Question: What is the job of CMM inspector? It is a professional operator who detects the shape and position tolerance of parts.

Question 5: What are the three coordinates? Coordinate measuring machine, also called 3D measuring machine, can measure many complicated space dimensions, which can be defined as "an instrument with a detector that can move on three mutually perpendicular guide rails. The detector transmits signals in a contact or non-contact manner, and the three-axis displacement measurement system (such as an optical ruler) calculates the coordinates (x, y, z) of each point of the workpiece through a data processor or computer and measures various functions. "

At present, there are also many CMM manufacturers in the market, such as Zhitai Group, which has high product advantages and precision, and the old name of 1996.

Question 6: The scope of three-coordinate detection At present, three-coordinate detection has been widely used in machinery manufacturing, automobile industry, electronics industry, aerospace industry and national defense industry, and has become an indispensable measuring equipment for modern industrial detection and quality control. It involves a wide range of departments and industries. In the scope of application, CMM also basically covers mechanical parts and electronic components as well as various shape tolerances and position tolerances. (See the table below): The linearity of name interpretation means that the actual shape of linear elements on parts keeps an ideal straight line. Also called straight. Straightness tolerance is the maximum allowable deviation between actual straight line and ideal straight line. That is, it is given on the drawing, which limits the allowable variation range of the actual line machining error. Flatness Flatness is to express the actual shape of plane elements of parts and keep the ideal plane state. Also known as flatness. Flatness tolerance is the maximum allowable deviation from the actual surface to the plane. That is, it is given on the pattern to limit the allowable variation range of the actual surface machining error. Roundness refers to the condition that the actual shape of the element representing the circle on the part is equidistant from its center. That is, the degree of circle. Roundness tolerance is the maximum allowable deviation between the actual circle and the ideal circle on the same section. That is, it is given on the pattern to limit the allowable variation range of the machining error of the actual circle. Cylindricity cylindricity refers to the point on the outline of the cylindrical surface of the part, which is equidistant from its axis. Cylindricity tolerance is the maximum allowable deviation of the actual cylindrical surface from the ideal cylindrical surface. That is to say, it is given on the drawing to limit the allowable variation range of the actual cylindrical machining error. Line profile refers to the state that a curve with arbitrary shape maintains its ideal shape on a given plane of a part. The tolerance of line profile refers to the allowable deviation of the actual profile of non-circular curve. That is to say, it is given on the diagram to limit the allowable variation range of the actual curve machining error. Surface contour is the condition to represent any shape surface on the part and keep its ideal shape. Surface profile tolerance refers to the allowable deviation of the actual profile of a non-circular surface from the ideal profile surface. That is, it is given on the pattern to limit the variation range of the actual surface machining error. Parallelism is the condition that the measured actual element on the part keeps the same distance from the benchmark. That is, the degree of parallelism. Parallelism tolerance is the maximum allowable deviation between the actual direction of the measured component and the ideal direction parallel to the benchmark. That is, it is given on the pattern to limit the allowable variation range of the measured actual element from the parallel direction. Verticality Verticality means that the measured element on the part keeps the correct 90 angle with respect to the reference element. That is, the orthogonality between two elements. Verticality tolerance is the maximum allowable deviation between the actual direction of the measured component and the ideal direction perpendicular to the reference phase. That is, it is given on the diagram to limit the maximum allowable variation range of the actual elements measured from the vertical direction. Inclination Inclination is the correct condition for the relative direction of two elements on a part to keep any given angle. Tilt tolerance is the maximum allowable deviation between the actual direction and the ideal direction of the measured element at any given angle relative to the benchmark. Symmetry means that two symmetrical central elements on a part remain on the same central plane. Symmetry tolerance is the allowable deviation of the symmetry center plane (or centerline and axis) of the actual component from the ideal symmetry plane. The ideal symmetry plane refers to the same ideal plane as the reference symmetry plane (or the center line and axis). Coaxiality Coaxiality means that the axis to be measured on the part is kept in the same straight line relative to the reference axis. Also known as * * * axis. Coaxiality tolerance is the allowable deviation of the measured actual axis relative to the reference axis. That is, it is given on the pattern to limit the allowable variation range of the measured actual axis relative to the ideal position determined by the reference axis. Positional degree Positional degree is the exact state of points, lines, faces and other elements on a part relative to their ideal positions. Position tolerance is the maximum allowable deviation of the actual position of the measured component from the ideal position. Circular runout refers to the condition that the revolving surface on the part keeps a fixed position relative to the reference axis in the specified measuring plane. The tolerance of circular runout is: when the measured actual component rotates around the reference axis for a whole circle without axial movement, it will be measured in a limited range. & gt

Question 7: What is a three-coordinate quality inspector? Coordinate measuring machine (CMM), referred to as CMM for short, refers to an instrument that can calculate various geometric shapes, dimensions and other measuring capabilities through a three-coordinate software system according to the point data returned by the probe system in a three-dimensional measurable space, also known as three-dimensional coordinate measuring machine and three-coordinate measuring machine.

Therefore, CMM inspector is the person who operates CMM.

Question 8: What is a CMM? Coordinate surveyor is a quality control work, mainly engaged in the inspection of workpieces or products, but the instruments are different. This thing is easy to learn and it is not a good job. No future.

Question 9: What are the complex shapes and sizes of all kinds of precision mechanical parts mainly measured by three-coordinate measuring instruments? It has good universality.