Hexagon offers comprehensive metering solutions for global manufacturing

The modern mold processing and manufacturing industry is developing rapidly, and the market competition in the mold industry is becoming increasingly fierce. In the case of shortened processing cycles and lower cost requirements, the accuracy requirements are not lowered. How does the mold manufacturing enterprise win in the market competition? With this problem, the author made an appointment interview with Mr. Chen of the Hexagon Shenzhen Sales and Service Center, the world's largest manufacturer of coordinate measuring machines at DMP2010 Dongguan International Mold & Metalworking Exhibition. .

With the advancement of the mold manufacturing industry, mold measurement technology has gradually developed. According to the different characteristics of mold manufacturing, different measurement techniques and measuring equipment came into being. From the digital mapping involved in the initial design of the mold to the measurement of the mold processing, the mold measurement, the mold acceptance measurement and the later mold repair measurement; from the small-sized electronic molds to the large molds in the automotive and large-scale molds in the aerospace industry. Measurement, high precision measuring equipment is everywhere. So far, the measuring equipment used for mold quality inspection includes not only the classic fixed high-precision coordinate measuring machine, but also various measuring equipment suitable for on-line application (such as portable articulated arm measuring machine, because of the characteristics of mold manufacturing, High-efficiency white light measuring machines, large-size laser trackers, etc. have also emerged, and the detection technologies such as contact, non-contact measurement, image and laser scanning, and photogrammetry have met the testing requirements of mold products. As the world's largest geometric measurement group, Hexagon's world-renowned measurement brands gather together to provide a comprehensive range of technologically advanced measurement products, aiming to provide comprehensive measurement solutions for the global manufacturing industry. Relying on the advanced measurement technology of customer demand, we strive to help mold enterprises achieve rapid mold manufacturing, improve mold product quality and obtain the best enterprise economic benefits in the fields of specialization, digitization, network and information.

Fixed coordinate measuring machine

A typical mold company, in addition to the production and manufacture of molds, will also involve the manufacture of some inspection tools, fixtures and general machine parts. In this case, high precision, strong function and versatility The machine has become the first choice of classical measuring equipment for the quality inspection of most mold companies. The measurement requirements of the mold usually include the specified point measurement of the control profile, the diameter and position measurement of the assembly and positioning holes, etc., and often the profile of the profile line is also required. At this time, the high precision, automation and point-to-point contact measurement capability of the fixed measuring machine is extremely suitable. If the mold workpiece is required to be directly matched with the point cloud on the CAD model or the mold part is mapped, the fixed measuring machine can also achieve high efficiency by means of contact continuous scanning probe or non-contact laser scanning probe. High-density point cloud scanning measurements. It should be noted here that the accuracy of contact measurement is usually better than that of non-contact measurement because of the difference in measurement structure and measurement principle. Small and medium-sized molds generally choose a bridge measuring machine with a granite platform. The parts can be directly clamped and fixed on the platform for inspection. The standard threaded holes of the M8 on the platform can be used to fix the clamp on the platform. For large and medium-sized molds in the automotive industry and aerospace, gantry measuring machines are the best choice. The structure of the gantry machine is more open, no need for platform support, the workpiece can be placed directly on the floor, and is not restricted by the weight. Therefore, it is possible to measure large molds that are overweight. At the same time, the size of the gantry machine can be increased according to the size of the workpiece. Therefore, the gantry The measuring stroke of the machine is larger, especially suitable for the measurement of oversized molds.

For ultra-small molds (such as electrode molds, plastics, medical, crafts and tools), you can use a composite image measuring instrument. This type of mold can use the composite sensor technology to select any suitable measurement method, including non-contact measurement and contact measurement such as laser, white light and image. If necessary, multi-axis turntable can be configured to perfectly realize the one-time installation of complex curved surface. Clip measurement. The advanced composite multi-sensor technology enables the composite image measuring instrument to demonstrate excellent precision and speed performance in small and thin soft mold measurement (OPTIV composite image measuring instrument has the highest precision up to nanometer level), difficult to clamp, difficult to measure and Problems such as low measurement efficiency have been effectively solved; the composite image measuring instrument has also promoted the development speed of the miniaturization process of manufacturing parts.

Portable articulated arm measuring machine, white light measuring machine and laser tracker

Rapidly realizing mold repair and shortening mold processing cycle is an increasingly urgent development demand for mold companies in recent years. Therefore, portable measurement systems that meet on-site online measurement have become more and more widely used measurement tools in the mold industry. In recent years, portable measurement systems in the industry mainly refer to articulated arm measuring machines, white light measuring machines and laser trackers. These devices have in common the low requirements of working environment conditions, the ability to complete on-site online measurement, and the installation and application of portable devices. Support optical non-contact and contact measurement methods.

In addition to the portable features, the articulated arm measuring machine has a compact body. The measuring arm is made of carbon material. It is very lightweight. When working, the operator can measure or map the workpiece with the measuring arm. The measuring direction can be like a human arm. Make any adjustments at any time, largely to avoid measuring dead angles. Therefore, the portable articulated arm measuring machine is one of the best equipment for measuring and mapping molds, especially for non-bulk single-piece surveying and mapping tasks. In addition to mold measurement mapping, measurement systems using photographic principles for measurement—COGNITENS white light measuring machines are often used for development of welding fixtures and molds, calibration of parts and assemblies, and complex root cause analysis. With the detailed data of the actual mold surface provided by the white light measuring machine, it is easy to find the deviation between the actual workpiece and the theoretical design, and support repair and rework. During the mold test, the white plate measuring machine can be used to measure and analyze the molded parts after the test, so as to pinpoint the problem and give the correct operation method to reduce the time of trial and error. White light measuring machines also support mold copying, pre-maintenance and mold archiving. Compared with other measuring equipment, COGNITENS white light measuring machine has the characteristics of strong light interference such as anti-sunlight and arc, high temperature resistance (resistant to 600 °C high temperature), anti-vibration and insensitivity to the surface material and color of the workpiece (no need for dusting). More adaptable to harsh environments.

The working process of the white light measurement system is to first align the workpiece for 3D photographing, quickly collect the point cloud data of the 3D surface, and then use the point cloud data to complete the corresponding detection and analysis tasks. Specifically, it includes: (1) comparing the measured point cloud data with the CAD model of the workpiece, and making a standard size analysis color difference map and a quality inspection report. (2) Slightly process the point cloud data of different components, perform digital virtual assembly (typical applications such as virtual mold clamping of the die and punch, and virtual assembly of the body parts), and then take out the section line gap of the virtual assembly. Observe and identify problems that may arise during actual assembly and analyze them. The white light measurement system equipped with COREVIEWPRO professional software can also perform trend statistical analysis on the quality of stamping parts during trial production or mass production.

The inspection of large tooling equipment (such as the measurement of welding fixtures) requires the use of larger measuring equipment to complete the large-scale measurement work in the field. In the field of large-scale measurement, Hexagon has the leading brand LEICA laser tracker in the field of laser trackers. The system has the following characteristics: (1) high measurement accuracy, called "moving CMM"; (2) large measurement range, containing large scenes from a few meters to 160M; (3) simultaneous support for trigger measurement and laser scanning The system not only measures hidden points, but also provides complex surface scan measurements.

On-machine measurement system

With the continuous innovation and development of measurement technology, advanced measurement technology is not only reflected in the measurement room and manufacturing site, but also innovatively applied to machine tools and processing equipment, that is, on-machine measurement systems. As an effective process control method, on-machine measurement technology provides real-time processing quality feedback for machine tool operators, which significantly improves the manufacturing efficiency of molds, especially large molds, while avoiding unnecessary machining errors. The on-machine measurement system includes an on-machine measurement system and an on-machine measurement system for the tool.

A complete on-machine measurement system consists of a machine tool probe mounted on the machine and its signal receiver, a measurement macro that is poured into the machine control system, and a computer with 3D measurement software connected to the machine control system. The standard measurement macro program generally includes measurement procedures such as point position, hole position, hole diameter, length, etc., which can complete high-precision automated alignment (centralization) tasks and basic dimensional measurement work; if equipped with 3D measurement software, it can be realized. It is similar to the measurement functions that professional CMMs can provide, such as comprehensive and professional shape and size measurement and size report function, and even has professional quality data statistical analysis function. The on-machine measurement system includes the on-machine tool setting instrument and its measurement macro program. On-machine measurement system is a very effective means to find problems in processing in time, such as improper process parameters, positioning deviation of clamping, machining dimensional deviation caused by tool wear, etc.; especially some workpieces are easy to deform and cannot be processed twice. Repairing, or moving large workpieces to professional measuring equipment, is difficult, and on-machine measurement makes these problems easy to solve.

Usually, the order of the molds is basically single or small batch orders. The delivery time is strict, and the precision requirements are high. It often involves the processing of complex surface lines. The process is complicated and the tool wear is serious. Therefore, preliminary The finished mold must pass the mold modification to be qualified, and the later work of the mold repairing process is cumbersome, which is an important reason for the influence of the delivery time in the mold manufacturing. In-machine measurement technology is introduced in the mold processing process. On the one hand, the positioning of the mold can be automatically and accurately corrected. In particular, the optimal coordinate system function can be used to revolutionize the original coordinate system of the mold processing (ie work). The accuracy of the offset increases the accuracy of the machining from the reference; on the other hand, it can perform real-time on-machine inspection of the dimensions in the process, and then directly compensate the machining allowance based on the measured machining results, thereby effectively improving The processing precision of the workpiece and the processing capability of the machine tool greatly shorten the repairing process and shorten the processing cycle, reducing the cost of the enterprise in terms of quality, working hours and raw materials. At present, on-machine measurement technology has developed into a low-cost, high-return process control method that is widely used in the manufacturing industry.

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