machinery | Screw protection
the disadvantages of manual preloading methods. It subjects the screw shafts to a defi ned tensile stress without exerting any torsion load. The machine operator selects the appropriate pressure specifi ed in the machine documentation and clamps the extracted screw in the preloading system. The defi ned preloading forces are said to prevent the melt from penetrating between the screw element and the shaft and thus help to avoid time and cost consuming dismantling and cleaning operations.
All extruder sizes in the ZE BluePower and the ZE-UTX series can be preloaded with only three preloading systems. A processing company generally needs only one preloading system for all of its extrud- ers, claims the company.
Feddem offers process barrels that are provided with
highly wear-resistant coatings when customer or process requirements call for them. The special alloy is manufactured in the HIP-process (hot isostatic pressing). This coating can be applied over the entire process area. Advanced tool steel and surface treatment R&D is a
major area of focus at Steer and one that the company claims can signifi cantly improve process effi ciency, durability and life of its compounding platforms, elements and components. Thiru Arumugam, head of the company’s tool steel operations, says its tool steel plant “was setup to drive innovation and create and develop tool steel that not only sets new benchmarks in performance, but allows our customers to work with new materials hitherto not possible, or realise signifi - cant effi ciencies within existing processes.” He cites Acrolloy55, the latest grade in Steer’s Acrolloy class of steel and a product of what the company refers to as Microgenic Technology. This is a vanadium-rich tool steel with other alloying and micro-alloying elements that together have very strong
Chart showing abrasion resistance of Steer Acrolloy 55 against a current high speed steel grade Source: Steer
abrasion resistance. The uniformly distributed carbides, metallically bonded to the matrix, are claimed to exceed the wear properties of traditional HIP powder metal- lurgy steels “by a large margin.”
Acrolloy 55 is a molybdenum high speed steel that has a wider heat treating range along with far greater resistance to decarburisation when compared to alternative high speed steels available today (HSS AISI M35 grade), a Steer spokesman claims. Acrolloy 55 also offers an excellent combination of red (or hot) hardness, toughness, wear resistance and cutting ability, along with fi ne grain and carbide particle size.
According to Steer’s laboratory analysis, when
compared to AISI M2 (the current top choice for fl ame retardant applications) Acrolloy 55 delivers far better properties both in a bromine and abrasion environment. Steer CR6-MOD was developed to eliminate high corrosion of elements in equipment processing fl ame retardant polyamide compounds containing bromine and glass fi bres. “Moreover, the presence of moisture in polyamides poses further complications while using Powder Metallurgy (PM) based steels,” Arumugam notes. By modifying the chemistry, the company says it is able to achieve far greater corrosion resistance. “Besides being extremely cost effective when compared to PM steels, CR6-MOD also demonstrated increased erosion resistance, high compressive strength, excellent through-hardening properties and good dimensional stability during hardening,” he says.
Click on the links for more information:
www.extruder-experts.com
www.nordsonpolymerprocessing.com
www.extremecoatings.net
www.leistritz.com
Graph comparing cresistance of Steer’s standard CR6 and new CR6-MOD corrosion protection coatings
54 COMPOUNDING WORLD | August 2016
www.centuryextrusion.com
www.kraussmaffeiberstorff.com
www.feddem.com
Source: Steer
www.steerworld.com www.compoundingworld.com
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