three blows are needed, such as socket head screws or trimmed components. A great advantage of these machines comes from the fact that the third blow can very often be used as an introduction punch if parts with large heads and a very short shank have to be transferred, such as might be the case with trimmed hex screws, DIN 931 M6x6mm or DIN 912 M6x8mm socket head screw. Carlo Salvi 2-die 4-blow machines are able to manufacture
many different parts, including: • Socket head screws. • Parts with trimmed heads. • Shouldered rivets, both solid and semi-tubular. • Tubular rivets with holes of two different diameters. • Electrical plug prongs. • Fasteners for assembling furniture. • Hose clamps.
Now Carlo Salvi has developed a new motorised model called
246E, an enhanced version of the manual Model 246 machine. The new Model 246E, says Carlo Salvi, has thus far been very well received by fastener and precision formed parts manufacturers on the west coast of the USA.
Electronic machine saves time The new 246E incorporates a linear wire feed with universal
grippers for all wire diameters. Tooling is less expensive, and there is no need for rolls so no need to stock them. The 246E also provides better cut-off quality with no wire deformation and absence of possible lines. Time saved in comparison with the manual version: around 3 minutes.
There is also an absence of the wire stop, with no bending of
the cut off. There is no possible deformation or hardening of the surface of the wire, which can pose great danger especially when aluminium or stainless steels are employed. Time saved: between 5 & 10 minutes.
The 246E provides electronic adjustment of the cut-off length.
This provides more accurate adjustment of length precision (0.05mm), which means better quality of the finished part. Also, there is no requirement to open guards or to use wrenches. Time save: approximately 5 minutes.
An optional cutter centering jig centres the cutter away from
the machine allowing the operation to be performed while the 246E machine is running.
Time saved: around 5 minutes.
An optional finger centering jig centres the fingers-also away from the running 246E machine.
Time saved: around 10 minutes. The 246E cold former also provides electronic adjustment of
the K.O. lengths on the die side. There is no need to change the K.O. cams. The user can produce solid parts, semi-tubular parts and fully tubular parts without changing any cam. This results in more adjustment of length precision (0.02mm). There is no need to open guards or to employ wrenches, and there is no need to stock K.O. cams.
Time saved: around 20 minutes. There is an optional punch centering jig that centres the jig
away from the machine. In addition to time savings, this option avoids possible crash of crosses and punch pins. Time saved: approximately 10 minutes.
The 246E cold header also provides a longer P.K.O. stroke
(2mm longer than the Model 246). And the adjustment is easier- made by a scaled cam.
Time saved: up to 15 minutes.
Additional features of the new electronic model The new machine offers tool sizes that are larger than the
manual Model 246. The 246E also has a larger heading area. Larger machine and tool tanks reduce maintenance time. Oil filters for the machine and tooling are also located in positions to facilitate maintenance operations. Additionally the new 246E provides improved discharge of finished parts to the operator area. The new machine’s touchscreen facilitates adjustments and
the reading of machine alarms. Production data for given parts can be saved and easily recalled in just a few seconds. Also, the new 246E machine provides the capability to mount the bad parts diverter, driven by the load monitoring equipment. The new Model 246E cold header machine offers significant
enhancements to reduce production costs when compared with the manual 246 machine. The new electronic machine also saves time and money as it facilitates rapid changeovers between parts.
106 Fastener + Fixing Magazine • Issue 68 March 2011
Electronics save time 2
-die 4-blow machines enable the manufacture of parts with complex shapes. They are particularly suitable for components whose heads have a very large volume or components where two dies are sufficient but at least
Carlo Salvi specialises in manufacturing 2-die 4-blow cold forging machines, able to handle wire diameters from 1.2mm to 10mm. Here, the Lecco-based company describes the time saving advantages of a new electronic version of its Model 246 machine.
The new electronic cold heading machine provides timing
of the transfer in the operator area. There is no need for the operator to move to the other side of the machine. Time saved: approximately 12 minutes.