Technology

Others offer Heat Treatment. We offer more.

We offer a wide range of services covering almost all the major heat treatment processes. We have the most modern laboratory equipment necessary to perform the measurement of hardness, micro-hardness and carbon concentration. We have a variety of automated or manually operated devices for heat treatment, allowing to perform tests for crack detection of components.

We are able to meet your needs in a very practical way. We offer our customers the opportunity to pursue professional and detailed consultation regarding feasibility studies, together with a discussion on all economic aspects and security issues. The best possible combination of materials and methods of heat treatment are necessary to achieve, as far as possible, the required parameters of a component, such as surface hardness, hardening depth, stability, core strength and wear resistance.

The plant in Dzierżoniów offers the following technologies:

Thermal processes

Technology

Annealing

The annealing process consists in heating the material up to a certain temperature, curing the material at that temperature and then slowly cooling it with the protective atmosphere or air cooling. Depending on the process parameters, it is possible to distinguish homogenising, normalising, spheroidising, recrystallising and stress relief annealing.

In the field of annealing our plant offer:

  • normalizing annealing with slow cooling in a protective atmosphere
  • recrystallization annealing in a protective atmosphere
  • spheroidizing annealing in a protective atmosphere
Technology

Tempering

Tempering is a heat treatment process consisting in heating the previously hardened steel to a certain temperature, withstanding and slow air cooling. The purpose of tempering is to remove the stresses created during hardening, to change the physical properties and, above all, to increase impact resistance at the expense of reduced hardness.

We can distinguish three types of tempering:

  • Low tempering at 150-250°C, applied in order to reduce hardening stresses. It does not significantly influence hardness reduction.
  • Average tempering at 250-450°C, applied in order to provide significant strength and elasticity while maintaining sufficient resilience and ductility.
  • High tempering at 450-Ac1, applied in order to significantly reduce hardness and obtain good flexural properties.
Technology

Hardening

Hardening is a heat treatment consisting in heating steel parts to a specified temperature of about 850-950 degrees temperature 30–50 degrees above temperature Ac3, withstanding for a specified period of time, and subsequent rapid cooling in an appropriately defined medium (water, oil) to achieve greater hardness and mechanical strength of the treated steel. After such treatment, the material is more resistant to abrasion. The purpose of hardening is to produce a martensitic and bainitic structure.

We can distinguish typical, gradual, isothermal, surface finish hardening. Depending on the type of hardening, the steel microstructure is martensite or bainite.

We offer normal hardening, which consists of heating in a protective atmosphere with subsequent cooling in the oil.

Technology

Precipitation Hardening

The precipitation hardening process is used for mainly non-ferrous steels and austenitic steels that do not show allotropic transformations. This process consists of solution and aging.

Technology

Vacuum brazing

It consists in combining elements with the use of a brazing material. Prepared elements with applied brazing material are placed in a vacuum furnace and heated up to brazing temperature (from 900 to 1200C) higher than liquidus temperature, held for a short time (10min) and slow cooling to solidus temperature. During the process, the appropriate level of vacuum need to be kept. Brazing in a vacuum furnace can also take place in a protective atmosphere, most often an argon atmosphere.

Thermochemical processes

Technology

Carbonitriding

It consists in simultaneous enrichment of the top layer of the element with carbon and nitrogen. It is a modified carburizing process, carried out at lower temperatures (775 – 900 ° C) and for a shorter time. The process is used to increase the wear resistance of low weight products with small dimensions.

Our company offers carbonitriding in an enriched carburizing atmosphere.

Technology

Gas carburising

Gas carburising is a thermochemical treatment consisting in heating steel parts up to 870 – 1000°C and heating them in a carburising atmosphere. The purpose of carburising is to enrich the surface layer with carbon in order to increase its hardness and abrasion resistance while maintaining the core’s toughness. Hardening and tempering are performed immediately after carburising

We offer carburizing in the carburizing atmosphere with the next annealing or hardening and tempering.

Additional processes

Technology

Assembly before brazing

The process that ensures proper assembly of elements before brazing. Methods used for assembly:

  • spot welding,
  • tack welding,
  • ball tack welding
Technology

Brazing jonts control

It consists in assessing the visual continuity of brazing, using “naked eye” or devices such as a borescope, endoscope; or checking the surface of the brazing cover using X-ray and ultrasonic.

Technology

Tin layer nickel deposition

It is used to ensure wettability of surfaces in the brazing process of materials containing aluminum and titanium particles.

  • sandblasting method, using a sandblast machine with a suitable nickel powder.
  • the “nickel flashing” method by AMS2451 consisting in applying a layer of nickel on the selected surface of the part.
Technology

Washing machines

One of the most important elements in the heat treatment process is washing before and after the process. Hauck Heat Treatment knows it! That’s why we have two high-performance chamber units for cleaning parts.

  • Cieffe WCF-8/2 / E-R – chamber cleaning device with two tanks for cleaning parts before the process. The advanced technology of used water-based detergents makes that details before the process are perfectly washed which has a decisive influence on the quality of the heat treatment while taking care of the environment.
  • EMO VAIOCS – high-performance hydrocarbon cleaner for cleaning the right part after heat treatment. It is characterized by excellent degreasing and washing features, which plays a crucial role in the subsequent production steps, affecting the quality of the finished product surface.
Technology

Sandblasting

We have a manual and automatic sandblasting machine MHG Strahlanlagen characterized by high performance and very good results of blasting sandblasted parts.

Technology

Crack detection

We also have a fully automatic BLUM crack detection device.

The scope of application of the crack testing machine includes 100% testing of key safety components such as drive shafts, wheel hubs or brake discs. Non-destructive vortex tests are performed by fully scanning the electromagnetic fields of the respective areas to eliminate the presence of cracks in the details.

Technology

Straightening

We have two fully automated MAE lines for straightening round and flat parts, as well as details of complex geometry (shafts, profiles). Both lines are endowen in integrated sensor for internal crack detection.

  • Max. 160kN pressure force
  • Workpiece lengths: 200-1000 mm
  • Workpiece weight: 0.5-5 kg
  • Straightening accuracy: up to 0,01 mm
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