hofmann Ceramic GmbH

Mühlweg 14, 35767 Breitscheid
Germany

Telephone +49 2777 9145-0
Fax +49 2777 9145-55
info@hofmann-ceramic.de

Location

Hall map

GIFA 2015 hall map (Hall 12): stand A34

Fairground map

GIFA 2015 fairground map: Hall 12

Our range of products

Product categories

  • 03  Refractories technology
  • 03.01  Refractory materials and products, insulating materials
  • 03.01.01  Refractory ramming mixtures

Refractory ramming mixtures

  • 03  Refractories technology
  • 03.01  Refractory materials and products, insulating materials
  • 03.01.02  Refractory bricks

Refractory bricks

  • 03  Refractories technology
  • 03.01  Refractory materials and products, insulating materials
  • 03.01.03  Refractory gating system parts

Refractory gating system parts

  • 09  Gating and feeding
  • 09.03  Filterelements for liquid metals

Filterelements for liquid metals

  • 09  Gating and feeding
  • 09.04  Exothermic materials

Exothermic materials

  • 09  Gating and feeding
  • 09.05  Cooling elements

Cooling elements

  • 09  Gating and feeding
  • 09.06  Strainer cores

Strainer cores

  • 09  Gating and feeding
  • 09.07  Feeder sleeves

Feeder sleeves

  • 10  Casting machines and pouring equipment
  • 10.01  Pouring equipment
  • 10.01.05  Launders

Launders

Our products

Product category: Refractory gating system parts

Pouring systems and Monoblock stopper

Isostatically-pressed monoblock stopper and nozzles from clay-graphite and fireclay can be produced in any desired shape and size, since the monoblock stopper are finished directly in accor- dance with customer needs and diagrams. Suitable nozzles are available in many tried-and-tested grades to ensure a precise match for customer requirements.

HOFMANN Pouring systems and Monoblock stopper:

  • High dimensional stability
  • Long service life
  • Constant casting times
  • Low slagging
  • Individual styling
  • For all current receptor systems

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Product category: Filterelements for liquid metals

HIPERCAST ®

Extremely durable ceramic-filter for use in steel and large-scale casting

Before this innovation for the filtration of cast parts in the field of steel and large-scale casting, foundrymen had to rely on ceramic filters made from foam ceramic materials based on zirconium oxide and silicon carbide or on graphite-based filters. However, both these filter types cause considerable difficulties because they are very fragile and thereby very expensive. Far too often, users found themselves struggling with uncontrolled filter breakage and extreme variations in flow characteristics.

For many years, pressed ceramic filters with round holes have been the state of the art in the production of smaller cast pieces. These filters are already well on the way – because of their extraordinarily good filtration performance resulting from their controlled mechanical and hydraulic properties – to leaving foam ceramic filters far behind. Until now these filters were available only for casting temperatures up to 1450°C and for flows up to 500 kg per filter. Nevertheless, because of the mechanical robustness of this type of filter, they are already used very successfully in large-scale casting involving cast weights of over 80t. However, a large number of filters have to be used for each cast piece and the design of the gating system ends up being correspondingly complex.

With the development of a new high-performance mullite-based ceramic material with the type designation HIPERCAST®, hofmann CERAMIC now has a pressed filter that can achieve levels of performance hitherto considered beyond the capability of individual filters. Castings have been successful completed where casting temperatures up to 1750°C were withstood and flows up to 15t for grey cast iron and 9t for ductile cast iron per filter were achieved. At the moment, the limits for the performance of these filters are unknown as we have not yet been able to destroy a filter so far in our tests. It appears that the determining factor for the limit may be flow speed (creation of turbulence) and not the mechanical and thermal robustness of the filters.

This takes the foundrymen into a completely new world:

  • Hydraulic properties are more accurately calculated with precise geometries.
  • Mechanical properties provide large reserves of fracture strength.
  • Filtration performance at the highest level, calculable and demonstrable.
  • Savings potential for circulating material and sand is extremely high.

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Product category: Filterelements for liquid metals

Round-hole filters

One of the main causes of high rejection rates are inclusions in cast parts. But this is one area where quality standards can easily be raised. Rely on ceramic filters from HOFMANN CERAMIC, which have been tried and tested many millions of times in practice.

We operate our own highly developed in-house tool manufacturing facilities and maintain excellent links with the scientific community. As a result, as well as creating first-class series products, we are also able to customize products to your own specific requirements.

Filtered cast parts are not only much stronger, but also reduce wear and tear on processing tools by up to 15 percent.

Our pressed, ceramic round-hole filters are produced using an in-house dry-pressing process that is unique worldwide. What’s more, they are the only such filters on the market that are stamped “Made in Germany”. Precisely calibrated flow rates ensure your casting processes are homogeneous, and the filters have already demonstrated their dimensional stability and quality for large castings weighing up to 50 t.

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About us

Company details

Hofmann Ceramic GmbH, a company with a seventy-year history of success, is once again showcasing its internationally renowned ceramic products for foundry technology at this year’s GIFA in Düsseldorf. Hofmann Ceramic products boast true "Made in Germany" quality – this is primarily because the company has kept full ownership of core development skills, production and its unique processes. For example, hard-wearing ceramic round-hole filters are manufactured in a unique, patented dry pressing procedure developed specially for foundry applications. They ensure flow rates are absolutely precise, thus delivering a homogeneous casting process with the lowest possible rejection rates and therefore high levels of productivity.

"Technical ceramics are indispensable for maximising casting quality and minimising rejection rates," explains Thorsten Reuther, Technical Manager at Hofmann Ceramic. "Our ceramic filters ensure castings are much stronger and also reduce tool wear during subsequent processing stages, thereby cutting costs."

The outstanding quality and stability of Hofmann Ceramic filters encourage laminar flow during casting and keep non-metallic inclusions to a minimum. These extraordinary, dry-pressed ceramic round-hole filters have already proven their reliability for large castings weighing up to 50 t and are available direct from stock in all popular formats and for all markets. The company’s globally standardised processes, recipes and quality assurance procedures ensure its international customer base can always rely on the very highest standards in product quality.

To meet customer requirements and provide the right products to suit the relevant foundry technology, Hofmann Ceramic also supplies foam ceramic filters and extruded cell filters to quality standards that have been tried and tested many millions of times in practice. Strainer cores can also be used to help easily adjust pouring rates to the desired casting parameters.

Yet another speciality in this supplier’s portfolio is the unique EXHOF-L feeder, which boasts an innovative geometry and covers all application areas in just a few dimensions. The low installation silicon-carbide chill-plates. A more limited chill effect than graphite and cast iron moulds produces lower levels of surface hardness, thereby resulting in lower processing costs and a shrinkage-free, even structure.

Comprehensive range of casting accessories

Hofmann Ceramic is a one-stop supplier of casting technology and, as a result, the company’s product portfolio also encompasses ceramic parts for investment casting such as pouring cups. Alongside standard series products, Hofmann Ceramic also develops and manufactures parts like these in line with specific customer requirements – a major benefit of operating in-house development and flexible manufacturing processes.

Rounding off the product range Hofmann Ceramic is presenting at GIFA are refractory parts and ceramic-coated tools for the aluminium industry.

Image:

Hofmann Rundlochfilter.jpg: Incredibly hard-wearing ceramic round-hole filters from Hofmann Ceramic are manufactured using a unique dry pressing procedure developed specially for casting applications. This ensures precise calibration of the flow rate for highly homogeneous casting processes with minimal rejection rates and high productivity levels.

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