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The cooling and tempering of different media (grinding
and cutting oils, emulsions, cooling water, hydraulic oils) in the area
of the metal processing are among the main applications of SIGMA
plate heat exchangers.
In modern, high-precision cutting and grinding centers, the required and unchangeable
precision can be achieved on the highest level only if the employed cutting and
grinding oils indicate only very slight deviation from the set-adjusted cooling
temperature.
This is achieved through cooling systems where the plate heat exchangers, as
a main component, are able to carry off the entire heat from the cutting and
grinding oils which is generated by all employed system aggregates and the frictional
heat arising in the processing, with the aid of optimally coordinated coolants.
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Different emulsions, with more or less milk-like consistency,
take over important tasks such as acting as cooling and lubricating materials
in boring machines, as well as shaping and planing machines. In order to
enable this and to keep the tolerance range of the workpieces to be processed
as low as possible, plate heat exchangers with their high levels of efficiency
and taking up the smallest possible space, guarantee cooling to the specified
temperature level.There is also the possibility to link
the plate heat exchanger into the so-called bypass mode, according to the structure
of the entire cooling system (central emulsion supply or decentralized
individual supply), and thus ensure that exact tempering is provided for
the entire emulsion stock.
In case of thermal processing of workpieces in the metal construction, quenching
baths are frequently employed, which are filled with either oil or
water. Since the heat generation, according to size and throughput quantity of
the workpieces, is mostly higher than the bath is capable of absorbing through
natural convection, a forced cooling of the bath content is also necessary here.
This additional cooling can be realized with high efficiency through SIGMA plate
heat exchangers. In times of ever increasing energy costs, an increasingly greater
importance is being attributed to heat recovery (WRG). The heat dissipated over
the plate heat exchanger from the quenching bath can be employed, without any
great expenditure, for the pre-warming and/or heating of process water or industrial
water.
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Typical tasks for SIGMA plate heat exchanger in metal
processing are:
- Cooling of cutting and grinding oil
- Tempering of drilling, milling and planing emulsions
- Cooling of machine cooling water
- Hydraulic oil cooling
- Cooling of oil/water quenching bath
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Application example: Nickel-plating of small parts
In the case of a company in the Duesseldorf area, nickel-plated,
mirror-bright cold strips are processed. Finished products,
such as battery wrappers or semi-finished products for
the electric industry, as well as household and office
products, are then manufactured from these. The company
has for years had the different nickel lines, which are
used for the galvanic surface refinement, equipped with
plate heat exchangers from API Schmidt-Bretten.
In the different manufacturing plants, SIGMA equipment
is used mainly for the heating and cooling of the nickel
electrolyte baths. Titanium is generally used as a plate
material and EPDM is used as a sealing material.
Application example: Manufacture of piston rings
An internationally active supplier of piston rings for
the automotive industry, with different production works
in Germany, has employed screw-connected plate heat exchangers
for more than 20 years in production. The well-proved SIGMA
plate heat exchangers are used especially for the cooling
of galvanic baths in the manufacture of these piston rings.
These are generally equipped with plates of titanium and
seals of Viton. More than 150 equipment units have been
installed in the production works in Germany. In production
plants abroad at least 50 equipment units have been installed.
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