MANUFACTURING TECHNOLOGY
Long lasting black coatings
Black zinc flake systems are highly demanded in various industries due to their attractive look. In particular the expectations and requirements of the automotive industry are eminently high when it comes to the durability of the coating appearance. Black zinc flake coatings are amongst the biggest challenges for paint suppliers.
coats, zinc flake coatings from Atotech are flexible systems that can be modularly and individually adapted to various requirements. Since the zinc flake technology presents no risk of hydrogen embrittlement, the coating is also perfectly suited for high tensile fasteners. During curing, the Zintek®
T T 90
he uniformity and long-term stability of the coating colour as well as corrosion resistance are the main issues of concern. With a comprehensive range of black base coats as well as organic and inorganic top
organic top coats such as Techseal® Black and Techdip, the Zintek® Black system provides an exceptionally uniform deep
black appearance with no silver shine through even after handling. Furthermore, Atotech points out that this system meets Volkswagen’s friction values window, assuring perfect assembly and providing excellent heat loosening properties avoiding the risk of self loosening. Atotech’s Zintek®
Black systems are approved by several base coats
form a conductive layer providing excellent cathodic corrosion protection to the base metal. According to Atotech’s approach of environmentally friendlier solutions, the zinc flake coatings are free of Pb-, Hg-, Cd-, Ni-, Co-, and Cr(VI). With its zinc flake system Zintek®
Black, Atotech says that it
meets challenging industries requirements. Combining Atotech’s unique black base coat Zintek®
300 B with a range of specialised
OEMs, such as Volkswagen (TL 180) and General Motors (GMW3359). Volkswagen’s specification TL 180 is typically used for small bulk parts and is mandatory for threaded fasteners. “Zintek®
Black is currently the only approved coating
system that successfully passed TL 180 corrosion protection requirements of 720 hours without red rust and 240 hours not exceeding the S1 classification in colour changing according to DIN 34804.”
Automated bolt hardening system put into production
Radyne Corporation, an Inductotherm Group company, says it has shipped a new automated induction case hardening and quenching system for bolt threads.
he system accommodates M4, M6, M8, M10 & M12 headed 4037 steel bolts, with quick changeover tooling plates and inductors allowing for maximum uptime and flexibility. The system features servo controlled inductor and
power supply height adjustment accommodating bolts ranging in part length from 12mm (0.05 inches) to 101.6mm (4 inches) long. Parts can be processed from 200 parts per minute to 400 parts per minute depending on the length of the bolts. An inline vibratory feed system interfaces with the rotary heat treat fixture to reliably orientate and deliver the bolts to the table tooling at the required rate. Radyne points out that a touch screen HMI interface and
temperature monitoring system offers superior control capabilities assuring the highest quality and repeatability of any induction system. “We’re very pleased to be able to deliver this system with
such a rapid payback for our customer,” said Justin Mortimer, president/CEO of Radyne Corp. “This new high speed fastener heat treating system represents a leap forward in rugged design, performance and ease of use for our customer.”
Fastener + Fixing Magazine • Issue 75 May 2012
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