MANUFACTURING TECHNOLOGY
Threads for winners
In the area of thread-rolling dies, WAFIOS Umformtechnik through HILGELAND is among the market leaders. What is the secret of its success, why do customers prefer to use HILGELAND dies? WAFIOS explains that it is the sum of advantages that eventually counts.
with the highest precision for long tool life and a program variety with which almost any thread and profile can be produced from a multitude of materials. Jürgen Hecht, area manager of WAFIOS Umformtechnik,
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explains: “Our thread-rolling dies enable a highly productive, constant and reliable production of quality products. When using dies of lower quality on the contrary, unexpected failures and high reject rates are possible. Moreover, a considerably increased quality control is required. Customers can be sure that our dies meet their requirements. We produce on up-to-date machinery and constantly optimise our production processes. It should be
AFIOS highlights that companies that use HILGELAND thread-rolling dies benefit from low system costs as well as from an increased competitive capacity. The reason: HILGELAND thread-rolling dies are made
noted that we are EJOT licence holders.” WAFIOS tool experts provide comprehensive advice on the
right choice of thread-rolling dies that meet the customers’ application requirements. Special geometries like knurls or cut-ins, for example, can be produced with HILGELAND thread- rolling dies. All current die sizes such as TR, GW, WFF can be delivered
directly ex stock – special sizes are also available within a very short period of time. Thread-rolling dies are made for metric threads, UN, BBS as well as for threads with a round or trilobular cross section. Furthermore, symmetrical and asymmetrical threads are possible for welding, dowel, T-head screws or furniture fittings. Thread-rolling dies can also be made from other materials such as HSS steels and powder-metallurgical steels in order to meet specific requirements.
Multiple operational VCM machines
Videx is offering a new series of VCM machines which perform multiple operations at the same time and replace traditional processes in production of straight parts with turned ends.
he VCM machines are equipped with 2 - 3 turning stations that turn, chamfer and drill the edges to virtually any requested length and diameter. The machines pull the wire from an uncoiler or in-line drawer, straighten it, cut
to length and turn the edges, face, drill and chamfer. Each turning station can performs up to four operations
such as facing, drilling, chamfering turning and calibrating the diameter. The cut-to-length parts move from one station to another by a servo operated transfer. All stations work simultaneously to save time and complete the part as quick as possible. While the first station turns the part for example, the second station drills or faces the next part, with each part only staying in each station for as long as it takes to complete the operation. The timing is controlled from the computer screen. The machines will accept wire directly from an in-line drawer
or will pull drawn wire from an uncoiler. Videx points out that the wire straightness is critical to achieve a precise finished part. This is achieved by using the Videx oscillating straightener
which is equipped with four pairs of feed rollers and three straightening shoes. Videx highlights that the length tolerance and repeatability
are also important. The wire in the Videx machines hits a positive stop before the cut-off takes place, assuring a length repeatability of ±0.1mm. During cut-off the straightener recoils against a spring
and travels back, to avoid turning on one spot along the wire. This feature is especially critical for hi-tensile wire, because stationary shear machines turn around the wire 3 - 8 revolutions during cut-off, creating an unavoidable weakening point which reduces the wire elongation and tensile strength. “This weakening is usually unseen but the parts made on
stationary shear systems will always be weaker then expected by the wire grade.” Videx also offers ‘Dual side – Dual purpose’ machines, which
can be used as straighten and cut on one side and perform other operations on the other side.
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Fastener + Fixing Magazine • Issue 69 May 2011
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