Extrusion Asia Edition 1-2019

38 测量技术 Extrusion Asia Edition 1/2019 首先是电缆的偏心率得到优化，接下来的步骤更为关键， 即维持所需要的平均壁厚，并进一步生产出符合最小壁厚极 限的产品。这些测量通常是通过采用ODAC® 和 UMAC®系统 在挤出机前和挤出机后来完成。此外，在生产线末端对外径 再次进行测量，并将测量到的冷态直径值结合进来。这 样，收缩量得以确定，并反馈到加工中来，从而对参数实现 最优配置。类似的处理方法改善了挤出管材的质量。刚开始 生产时，管材的偏心率必须得到控制，然后尽可能快地控制 壁厚和最终产品的外径。壁厚的最佳化和外径的监测都是组 合采用了仲巴赫性价比高的超声波技术和激光测量技术。 在电缆和管材挤出过程中精确的监视和质量控在挤出电 缆或管材护套时，UMAC® 超声波测量系统确保了在产品偏 心时和达到预定的壁厚时进行早期提醒。UMAC® 系统可以 allow the eccentricity, independently of the material tempera- ture to be measured. Once the eccentricity of the cable is opti- mized, it comes down to the next stage of maintaining the re- quired average wall thickness and then further to derive the mi- nimum wall thickness limitation. These measurements are typi- cally performed before and after the extruder by ODAC ® and UMAC ® . An additional measurement of the outside diameter at the end of the line allows the integration of the measured cold diameter value. This allows the determination of the shrinkage, which can thus be fed back within the process to realize optimum configuration. Similar approaches generate quality improvements in pipe ex- trusion. At the beginning of the process, the eccentricity of the pipe must be brought under control, then the wall thickness and finally outer diameter as quickly as possible. The optimiza- tion of the wall thickness and the monitoring of the outside diameter is also ensured by the combined and cost-effective ul- trasonic and laser measurement technology from Zumbach. Accurate process monitoring and quality control during cable and pipe extrusion In the extrusion of cables or pipe jackets, UMAC ® ultrasonic measurement ensures early notification of product centraliza- tion and achieved Wall thickness. UMAC ® measures and con- trols parameters such as eccentricity and wall thickness for up to 5 layers of materials at a maximum of 8 individual measuring points around the circumference. Additional installed ODAC ® or MSD® diameter measuring heads benefit by checking the diameter and ovality. Using these technologies, allows the ma- nufacturer to closely monitor the extrusion processes and thus continuously maintain the quality requirements. Dual Loop Strategy maximizes quality on extrusion lines Control solutions such as Zumbach’s dual-loop method, as ex- ample, takes into account the product properties in both the hot and cold conditions. The resultant reported data is deter- mined from a combination of the diame- ter measurement using ODAC laser mea- suring heads and UMAC ultrasonic eccen- tricity and wall thickness scanners. Wherever several ZUMBACH systems are used in combination, remarkable success- es can be achieved in DLP measurement and control. Considerable thought should always be given to investing in several high precision and reliable control technologies within the extrusion line. After all, global materi- al costs are rising just as fast as quality re- quirements. Whether it is quality improve- 按照客户要求定制的ODAC®和 UMAC®测量仪器，应用到产品外径达 500mm的挤出生产线上 Customer specific solution with ODAC ® and UMAC ® gauges in an extrusion line for products up to 500mm OD 三坐标 ODAC550 系统，测量外 径为500mm的 海底线缆 3-axis ODAC 550 system, measuring an Offshore cable of 500 mm OD