Copromec was founded in 1999 and started its business as
production consultant, planning and building of different kinds
of equipment and machining cells for die-casting factories.
Up to now, all Copromec’s efforts are applied to technical and
productive development of the die-casting plunger tip. This
product was born after a twenty years experience of technicians
who created, planned and tested on a high scale what is today
the main product of our company.
Our product has been known and appreciated in a lot of countries
thanks to its technological features, quality and innovation. We
have patented this system in Italy and abroad.
Besides this leader product, Copromec supply also a series of
other products planned in order to guarantee high quality
performance: rods, sleeves and heat dissipators.
Copromec cooperates with important companies in Italy, Europe
and other continents.
The company guarantees the product quality and supplies
an excellent technical assistance at the beginning steps
and during the usual production cycles, so to meet the
customer’s requirements of technology growth. This leads
to an advantage of both Copromec and its customers.
The company is always oriented to new inputs and
experiences.
Die Casting Plunger Tips Patented
The COPROMEC injection plunger tip (Patented) is a powerful innovation built for the cold chamber die casting
field (aluminium and magnesium). The innovation consists in using the energy of the liquid aluminium during
the injection phase, in order to push the rings on the shot sleeve perimeter.
The system is composed of a steel plunger tip, one or two copper
rings and one plunger support pin called support pin. The plunger
tip is made of a special steel to be efficient with the casting process
with a wide temperature range and heavy working conditions. It
contains two rings made of a special pressed copper alloy.
The copper rings are always in contact with the shot sleeve and
they work as a seal for the liquid aluminium as in a hydraulic system.
Between the plunger tip head and the first ring, there are some slots
to permit the aluminium to enter under the ring.
The first ring contains the liquid aluminium and uses its power to be
in constant contact with the sleeve perimeter. At each injection it
enlarges and stops the solidified aluminium below to guarantee the
best contact with the shot sleeve.
The support pin is made of a high quality hardened steel and it is
assembled behind the plunger tip by a thread. The thread is blocked
by the contact with the plunger tip head and the support pin head.
The support pin cooling system works utilizing a cooling-hole circuit.
Characteristics and advantages of this system:
> User friendly system and production efficacy.
> Acceptance of operator mistakes without expensive damages
(ring breaking max).
> Constant injection cycles as result of compensation created by
copper rings.
> Machine stop reduction.
> Cycle time reduction.
> Shot sleeve life improvement.
> Production efficacy.
> Shot sleeve ovalization compensation.
> Shot sleeve taper compensation
> Compensation of wider tolerances.
> It supports and balances mistakes due to the poor or absent
lubrication
Shot sleeves
Built on Copromec project and CNC worked.
We have noticed that using our shot sleeves together with Copromec
plunger tip, the sleeve life can increase of about 50% in comparison
with standard performance.
To build our shot sleeves we use:
Steel 1.2344
Surface hardening treatment:gas nitriding
Tempering: 49-50 HRC
Accessories
Rods
Built according to specific technical features. The rod planning is carefully
analyzed in details to balance water input/output, to guarantee a correct
cooling system on the plunger tip head.
Other features are:
>easy assembling of water distributor and its pipe
>waterproof system and separation of water input/output of the system.
Material: 39NCD3 R = 100 kg/mm2
Costruction : Copromec project
Working: CNC
Heat dissipator
To control possible and frequent problems of:
> thermic deformation of the shot sleeve
> erosion of the bottom part of the sleeve due to temperature increase
in the area of metal loading
Copromec has planned a special dissipater, whose application is
particularly fit in case of:
> important (casting) dimension
> special cycle conditions (particularly fast cycles)
The dissipator assembling is quite easy: it is inserted on the sleeves,
introducing it and fixing it with proper supports. Then, the connection
of water input and output follows. The dissipator can often been
assembled also after the creation of the group rod-plunger tip.
It can be used for several sleeves of the same diameter.
