With its high precision, high flexibility and excellent digital capability, the coordinate measuring machine has become an important means for modern manufacturing, especially mold industry design, development, manufacturing and quality assurance.
Effective tool for mold quality assurance
The coordinate measuring machine is widely used in the mold industry. It is a modern intelligent tool for design development, testing and statistical analysis. It is also an effective tool for the unparalleled quality and technical support of mold products. The three coordinate measuring machines used today include bridge measuring machines, gantry measuring machines, horizontal arm measuring machines and portable measuring machines. The measurement methods can be roughly divided into contact type and non-contact type. At present, Metris LK's measuring machine ranks among the world's top two technologies.
If there is a deviation between the core cavity of the mold and the guide bush guide sleeve, the deviation value can be found by the coordinate measuring machine for correction. After the core cavity contour of the mold is formed, many inserts and partial curved surfaces are formed by electric electrodes on the electric pulse, so that the quality of the electrode processing and the non-standard surface quality become the key to the mold quality. Therefore, it is necessary to measure the shape of the electrode with a coordinate measuring machine.
The coordinate measuring machine can apply the input of the 3D digital model, compare the positioning, size, related geometrical tolerances, curves and curved surfaces of the finished mold with the digital mold, and output a graphical report to reflect the quality of the mold intuitively and clearly. Form a complete test report of the finished product.
In some cases where the mold is used for a period of time and the wear is corrected, but there is no original design data (ie, digital mode), the point cloud can be collected by the cross-section method, output in the specified format, and the probe radius is compensated for the shape. Achieve the original repair effect.
When some surface contours are neither arcs nor parabola, but some irregular surfaces, the surface can be manually used as a bottom embryo with cement or plaster. Then use the coordinate measuring machine to measure the section lines, characteristic lines and parting lines on each section, output in the specified format, the shape of the probe radius compensation, and the smooth curve in the modeling process, so as to design and manufacture a brand new mold.
Correct use of the coordinate measuring machine plays a key role in its service life and accuracy. The following points should be noted.
(1) Before lifting the workpiece, return the probe to the origin of the coordinate to reserve a large space for the lifting position; the workpiece should be hoisted smoothly and must not hit any component of the CMM.
(2) Properly install the parts and ensure that the isothermal requirements of the parts and measuring machines are met before installation.
(3) Establish a correct coordinate system to ensure that the coordinate system constructed meets the requirements of the drawings to ensure the accuracy of the measured data.
(4) When the program is programmed to run automatically, it is necessary to prevent the probe from interfering with the workpiece, so it is necessary to pay attention to increase the inflection point.
(5) For some large and heavy molds and inspection tools, the workbench should be hung in time after the measurement to avoid the workbench being in the load state for a long time.
The ideal digital tool for molds
In 1974, Brown & Sharpe launched the world's first CNC measuring machine. After that, PC-DMIS took the lead in introducing powerful CAD functions into measurement software. Since then, CMM has become a modern manufacturer with its high precision, high flexibility and excellent digital capabilities. In particular, the industry is an important means of design, development, manufacturing and quality assurance of the mold industry. I focus on two important roles of the measuring machine for the mold industry.
First, the measuring machine can provide quality assurance for the mold industry and is the best choice for mold manufacturing companies to measure and test. The flexibility of the measuring machine in handling different tasks and its own high precision make it a master arbiter. While providing dimensional data for process control, the measuring machine provides additional performance such as in-process product inspection, machine tool calibration, customer quality certification, gauge inspection, machining testing, and optimization of machine settings. The highly flexible CMM can be placed in the workshop environment and directly involved in all stages of mold processing, assembly, trial and repair, providing the necessary test feedback, reducing the number of rework and shortening the mold development cycle, thus ultimately reducing The manufacturing cost of the mold and the production is controlled.
Second, the measuring machine has powerful reverse engineering capability and is an ideal digital tool. The combination of different types of probes and different structural forms of measuring machines enables fast and accurate acquisition of three-dimensional data and geometric features of the workpiece surface, which is particularly useful for mold design, sample replication, and repair of damaged molds. In addition, the measuring machine can be equipped with contact and non-contact scanning probes, and use the powerful scanning function provided by PC-DMIS measurement software to complete the replication of complex workpiece CAD models with free-form surface features. It can be directly recognized and programmed by various CAD software without any conversion, which greatly improves the efficiency of mold design.
Specifically, when applying measurement machines to complete design and inspection tasks in mold manufacturing enterprises, close attention should be paid to the selection of measurement standards, calibration and selection of probes, planning of measurement points and measurement locations, establishment of coordinate systems, and environmental impacts. , the influence of local geometric features, CNC control parameters and other factors. Each of these factors is sufficient to affect the accuracy and efficiency of the measurement results. Hexagon has a long-term experience in more than 3,000 customer operation trainings in China, forming a complete system from primary, intermediate to advanced training. Our understanding of the correct use of measuring machines is as follows.
First, choose the right equipment and the right detection strategy. And through the necessary arguments, from the aspects of accuracy, efficiency and measurement methods to measure whether the measuring machine meets the work objectives.
Second, the surveyor must undergo the necessary training, be familiar with the measurement objectives and be competent for the job.
In addition, all measurement equipment and technical indicators of the measurement process should be regularly evaluated and summarized.
Finally, demonstrate the consistency of the measurement results.
Key equipment essential to the mold industry
With the rapid development of modern manufacturing industry, especially the development of automobile manufacturing industry, the requirements for mold design and manufacturing are also increasing. The coordinate measuring machine has become an indispensable key equipment in mold manufacturing.
The coordinate measuring machine is a precision numerical control testing equipment. Its precision is higher than that of general CNC machine tools. It is widely used in the manufacturing of molds, automobiles, aerospace, aerospace and machinery. It can accurately detect the geometrical dimensions and geometrical tolerances of products. . In industrialized countries in the United States and Europe, measuring machines have become very popular, and each of the seven CNC machine tools is equipped with a CMM.
In addition to the conventional geometric size and shape tolerance detection functions, the coordinate measuring machine has special advantages in reverse engineering technology and surface coordinate detection, and is very suitable for the mold manufacturing industry. Reverse engineering is the process of reversing product design data (digital models or design drawings) by measuring the geometric dimensions and surfaces of a coordinate measuring machine based on existing product models or samples. Therefore, by using reverse engineering technology, it is convenient to manufacture the mold or directly process the product according to the sample provided by the customer, which is widely used in the mold manufacturing, automobile, motorcycle and other industries.
As a digital measuring device, the coordinate measuring machine can obtain the three-dimensional coordinate data of the workpiece surface through the measurement of curves and curved surfaces, and then use the reverse engineering CAD technology to obtain the CAD mathematical model of the product, and then use the CAM system to complete the product manufacturing. Reverse engineering technology uses advanced computer digital graphics technology to express complex workpiece shapes, which can replace traditional object-based shape transfer methods, shorten product development and trial cycle, and reduce costs.
In the mold manufacturing industry, most of the molds are manufactured on CNC machine tools according to the CAD mathematical model. Compared with the original CAD mathematical model, it is determined by the coordinate measurement machine. . In the software system of the coordinate measuring machine, the original CAD mathematical model can be graphically displayed, and then the measured point is determined from the graphic according to the visualization method, and the X, Y, Z coordinate values ​​and the normal vector of the measured point are obtained. Generate an automatic measurement program. The coordinate measuring machine can accurately measure the workpiece according to the normal direction, obtain accurate coordinate measurement results, and can also be compared with the original CAD mathematical model and graphically displayed to generate coordinate detection reports (including text reports and chart reports). The whole process is intuitive and fast, but can't be done with traditional detection methods.
The use of a three-coordinate measuring machine can reduce the measurement error, ensure the accuracy and quality of the product, meet the design and manufacturing needs, and play an important role in promoting the market competitiveness of the product, and greatly promote the technological progress of the mold manufacturing industry. Therefore, the coordinate measuring machine has a very broad application prospect in the mold manufacturing industry.
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