The company uses the three-dimensional ZEISS coordinates imported from abroad. This instrument is a detector that can move in three directions and can be moved on three mutually perpendicular rails. This detector is transmitted by contact or non-contact. Signal, three-axis displacement measurement system (such as optical ruler) calculates the coordinates (X, Y, Z) of each point of the workpiece and the instrument for measuring various functions through a data processor or computer. The measuring functions of the three-coordinate measuring instrument should include dimensional accuracy measurement, positioning accuracy measurement, geometric accuracy measurement and contour accuracy measurement. Any shape is composed of three-dimensional space points, and all geometric measurement can be attributed to the measurement of three-dimensional space points. Therefore, the accurate collection of space point coordinates is the basis for evaluating any geometric shape.
The basic principle of the ZEISS coordinate measuring machine is to place the measured part within the range of the measurement space allowed by it, accurately measure the values of the points on the surface of the measured part at three coordinate positions in space, and pass the coordinate values of these points through the computer Processing and fitting form measuring elements, such as circles, spheres, cylinders, cones, curved surfaces, etc., through mathematical calculation methods to obtain their shape, position tolerance and other geometric data.
Application field
Mainly used for the measurement of cabinets, racks, gears, cams, worm gears, worms, blades, curves, curved surfaces, etc. in the industries of machinery, automobiles, aviation, military, furniture, tool prototypes, machines and other small and medium-sized accessories, molds It can also be used in electronics, hardware, plastics and other industries. It can accurately detect the size, shape, shape and position tolerance of workpieces to complete parts detection, shape measurement, process control and other tasks.
Mold industry
The coordinate measuring machine is widely used in the mold industry. It is a modern intelligent tool for design, development, inspection, and statistical analysis. It is also an effective tool for the unmatched quality and technical guarantee of mold products. The three coordinate measuring machines mainly used today include bridge measuring machines, gantry measuring machines, horizontal arm measuring machines and portable measuring machines. Measurement methods can be roughly divided into two types: contact and non-contact.
If there is a deviation between the matching of the core cavity of the mold and the guide column guide sleeve, the deviation value can be found out by the coordinate measuring machine for correction. After the contour of the mold core cavity is formed, many inserts and partial curved surfaces are processed by electrodes on the electrical pulse, so the quality of electrode processing and the quality of non-standard curved surfaces become the key to the quality of the mold. Therefore, it is necessary to measure the shape of the electrode with a coordinate measuring machine. The coordinate measuring machine can use the input of 3D digital model to compare the positioning, size, related geometric tolerance, curve, and surface of the finished mold with the digital model, and output a graphical report, which reflects the quality of the mold intuitively and clearly Form a complete mold product inspection report. In the case where some molds have been worn for a period of time and need to be corrected, but there is no original design data (ie, digital model), the point cloud can be collected by the cross-section method and output in a prescribed format. Achieve intact repair effect.
When the contours of some curved surfaces are neither circular arcs nor paraboloids, but irregular curved surfaces, you can use oil sludge or plaster to manually make curved surfaces as the base embryo. Then use a coordinate measuring machine to measure the cross-section lines, characteristic lines and parting lines on each section, and output them in a prescribed format. After the probe radius is compensated for modeling, the curve is smooth during the modeling process, thereby designing and manufacturing a brand-new mold.
With its high precision, high flexibility and excellent digital capability, the CMM has become an important means of design, development, processing and manufacturing and quality assurance in modern manufacturing, especially the mold industry. CMMs have two important roles for the mold industry.
One and three coordinate measuring machines can provide quality assurance for the mold industry, and are the best choice for measurement and inspection of mold manufacturing enterprises. The flexibility of the CMM in handling different tasks and its own high precision make it an arbiter. While providing dimensional data for process control, the CMM can provide additional performance such as in-plant product inspection, customer quality inspection, gauge inspection, and mold workpiece inspection. The highly flexible CMM can be configured in the workshop environment, and directly participate in the various stages of mold processing, assembly, trial mode, and mold repair, provide the necessary inspection feedback, reduce the number of rework and shorten the mold development cycle, which ultimately reduces The manufacturing cost of the mold and bring the production under control.
The second and third coordinate measuring machines have powerful reverse engineering capabilities and are an ideal digital tool. Through the combination of CMM probes and CMMs of different structural forms, it is possible to quickly and accurately obtain the three-dimensional data and geometric characteristics of the workpiece surface, which is particularly useful for mold design, sample copying, and repair of damaged molds. . In addition, the contact scanning probe of the coordinate measuring machine can use the powerful scanning function provided by the measurement software to complete the copy of the CAD model of the complex workpiece with free-form surface shape features. Without any conversion, it can be directly recognized and programmed by various CAD software, thus greatly improving the efficiency of mold design.
Specifically, when using a coordinate measuring machine in a mold manufacturing enterprise to complete design and inspection tasks, we must pay close attention to the selection of measurement standards, the calibration and selection of probes, the planning of the number of measurement points and measurement positions, the establishment of coordinate systems, and the environment The impact of many factors. Each of these factors is sufficient to affect the accuracy and efficiency of the measurement results. The application of CMMs in the production of molds is already out of sight. Some mold designs require CMMs. It can greatly improve the design efficiency of the mold, and the accuracy will be greatly improved.