The Extrusion of Hard Metal Profiles
The process technology Dosing Weighing and proportioning of powder and liquid raw materials and additives Intermittent mixing, kneading and plasticizing of the body Kneading Straining Extruding Storage of the kneaded batch, homogenizing and continuous dosing of extrusion plant Continuous de-airing followed by shaping of the plastic body forming profiles of different geometry
The Technology Continuous extrusion of hard metal profiles with auger extruders For extrusion of hard metal profiles the de-airing extrusion unit employed is of the so-called transverse-arrangement type, which enables to vary the direction of extrusion freely from horizontal to vertical. For the production of small profiles, as well as micro extrusion, a barrel diameter of 50 mm was selected in view of the degree of deformation to be expected. Thanks to the feedback of the motors, the augershaft speeds of the primary pug sealer and of the extruder can be varied very accurately from 0 25 rpm allowing different extrusion modi. Extrusion of hard metal profiles
De-airing extrusion unit VAQRS 50 for 45 angle degree extrusion The control system not only facilitates the pre-setting of all operating values on the touchscreen, but also the tracking and recording of all data, both online and offline. A special auger geometry was designed to deal with extremely stiff hard metal and related materials which, in the case of small section profiles and high degrees of deformation respectively, results in reduced flow pressure rates and torques. As an option the axial pressure as well as the pressure build-up over the entire auger length can be detected, in addition to the flow pressure at the die. For processing abrasive and/or corrosive bodies all materials coming into contact with the body are
suitably optimized. In such cases, augers made of ceramic, hard metal and special plastic materials can be used, besides different stainless and hardened steels, provided with PTA, HVOF, CVD or PVD coatings. Other possible options are the selective tempering of the augers, the barrel sections, as well as the machine bodies. Also available are special sealing systems between the primary pug sealer and the extruder suitable for those materials which demand a constant and high degree of de-airing for extrusion. If the dies and/or the strainer plates need to be changed frequently, hydraulic screen changer systems can be offered. Hydraulic screen or die changer
VAQR 50 Type VAQR 50A/50 Auger-shaft speed infinitely variable Primary Pug Extruder Sealer 1/min 2-30 2-30 Max. motor capacity kw 2,2 2,2 Max. torque for the entire speed range Designed for max. pressure max. axial force Nm 300 500 subject to design of auger bar 50 150 kn 10 29 Max. volumetric throughput rate l/h approx. 30
VAQR 80 Type VAQR 80A/80 Auger-shaft speed infinitely variable Primary Pug Extruder Sealer 1/min 2-30 2-30 Max. motor capacity kw 3 5,5 Max. torque with monolithic a uger with segment auger Designed for max. pressure max. axial force Nm bar kn 1000 2000 1000 1500 subject to design of auger 50 150 25 75 Max. volumetric throughput rate l/h approx. 120
Who we are ECT-KEMA have a long history: In 1878 Richard Raupach founded an engineering company in Görlitz with a factory producing steam engines; later the focus was on brick making machines, thus forming the essential basis for further development in ceramic machinery and plant engineering. Up until 1939 Raupach was the largest European manufacturer of this type of plants also being the owner of several brick factories. From 1947 onwards the company operated under the name of VEB KEMA manufacturing and planning plants for the fine and technical ceramics industry. The merger of the production program and the know-how potential of KEMA GmbH and ECT GmbH in 2015 enabled the newly formed ECT KEMA GmbH to substantially expand their range of activities into new areas of technology. As the European market leader in extrusion of ceramic bodies for engineering ceramics and related materials, we are constantly striving towards optimizing the benefits of our clients world-wide on the basis of an open partnership. ECT-KEMA GmbH Holtendorfer Straße 31 D-02829 Girbigsdorf Phone: +49 (0)3581-878 777-0 Fax: +49 (0)3581-878 777-77 E-Mail: info@ect-kema.de Web: www.ect-kema.de