Investigation report on the hottest European heat

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Summary of the European investigation report on heat treatment technology: 1. German Institute of materials science; 2. Schmetz vacuum furnace company; 3. Epson company; 4. Aichelin company

5 Magna Steyr powertrain; 6 TAV company; 7 concluding remarks

a 16 member delegation of the national heat treatment society went to Europe to investigate heat treatment technology from September 23 to October 6, 2003. During their stay in Europe, the delegation visited the German Institute of Materials Science (IWT), schmets and its users harthr, Ipsen, Aichelin in Austria and its user Magna steya's heat treatment workshop, and TAV in Italy; During the inspection, the delegation also had technical exchanges with European heat treatment counterparts on the development and development prospects of material heat treatment technology, new technology of heat treatment equipment manufacturing, production management and other aspects

1. The Institute for Materials Science (IWT)

the Institute for materials science is a research institute engaged in basic and applied research in the field of metal processing. It is the only comprehensive research institution in Germany in terms of metal processing technology at present. Its predecessor is the German Institute of hardening technology, which was changed to its current name in 1989. There are 150 people in the Institute, including 70 scientific researchers and 50 other technicians

the Institute of materials science consists of three departments: Materials Science, process engineering and manufacturing technologies. The director of the Department of materials science is concurrently held by Professor yr, the director of the Institute. Professor yr is a well-known scholar in the field of international material heat treatment and surface engineering, and once served as the chairman of IFHTSE of the year. The research fields of the Department of materials science mainly include the following technologies:

heat treatment

surface technology

mechanical properties

physical analysis

metallurgical analytical methods

Professor f Hoffmann, Dr. th Lubben in charge of the heat treatment department Chinese scholars Jianfei Wei and Jian Dong who worked in IWT received the delegation and accompanied the delegation to visit the material heat treatment laboratory. The laboratory has heat treatment furnace, cooling test device, stress-strain simulation, performance test, microanalysis and other test equipment that can carry out various process tests. The test means are complete and the equipment is advanced


f Hoffmann also introduced to the delegation the research contents of IWT in material heat treatment, mainly including:

surface refining by ion implantation (20keV)

high pressure gas quenching

nitriding and nitrocarburizing

gas carburizing Gas atmosphere, low pressure carburizing, plasma assisted processes

quenching in fluids and gases (high pressure and nozzle field quenching)

pressure hardening with fluid and gaseous media

sensor development for heat treatment and surface treatment (development of sensors for heat treatment and coating processes)

plasma assisted chemical vapor deposition (PACVD) methods

physical vapor deposition (PVD) methods)

development and validation of test methods for hard surface coating)

development of calibration standards for testing hardness

from the 2002 annual report provided by the Institute, Recent research topics related to heat treatment include:

distortion engineering

effect of core strength on the load-carrying capacity of vacuum carburized high-pressure gas quenched gears

effect of high-temperature Carburization on fatigue resistance

wear resistance and coating structure of steel after CVD coating and induction surface quenching

heat treatment of high-strength aluminum alloy

industrial application of plasmon nitriding of aluminum alloy parts

effect of PVD coating on the load-carrying capacity of carburized gears

prediction of service limit of nitrided parts

laser hardening process Optimization

Plasma Nitrocarburizing

Computer Aided heat treatment process simulation

development of standard methods for evaluating the quenching effect of quenching systems

heating and quenching of complex samples

development of low-pressure carburizing and anti-seepage methods and anti-seepage coatings

2 Schmetz GmbH vacuum furnace company (schmetz GmbH)

schmetz company is one of the three industrial furnace companies subordinate to metall technologie holding GmbH, specializing in the development, design and manufacture of vacuum industrial furnaces. Its products are mainly used in vacuum quenching, tempering, annealing, brazing, high-temperature sintering and other processes, with a temperature range of 200~1600 ℃

the size series of the company's standard horizontal and vertical vacuum furnaces are shown in Table 1 and table 2

Table 1 standard horizontal vacuum furnace size series

flexible packaging requirements tension machine 1 machine multi-purpose number loading size (width * length * height)/mm loading capacity/kg

01300 × three hundred × 300 50

02 300 × four hundred and fifty × 300 80

11 400 × six hundred × 400 200

12 600 × six hundred × 400 300

21 600 × nine hundred × 600 600

22 600 × nine hundred × 900 600

31 800 × one thousand and two hundred × 800 800

32 900 × one thousand and two hundred × 700 800

41 1000 × one thousand and five hundred × 1000 1000

42 1200 × one thousand and five hundred × 1000 2000

44 1200 × two thousand × 1200 2500

resulting in screw twists

Table 2 standard vertical vacuum furnace size series

model charging size (diameter * height)/mm loading capacity/kg

11 900 × 900 800

22 1200 × 1200 1500

33 1500 × 1500 2500

44 1800 × 1800 3500

55 2100 × 2100 4500

66 2400 × 2400 5500

77 2700 × 2700 6500

88 3000 × 30008000

the company has developed the following proprietary technology on the standard vacuum furnace:

system *futur* -- auxiliary convection heating system

system *2r* -- bidirectional cooling system with reversible direction

system *2 × 2r* -- reversible vertical or horizontal bidirectional cooling system

system *tms* -- computer process management system

system *2plus* -- cold chamber cooling system

system *coo plus* -- heating quenching and cold treatment (-185 ℃) can be completed in the same vacuum furnace Three tempering processes

the technicians of the company especially introduced two systems, system *2plus* and the newly developed system *coo plus*. Figure 1 (omitted) is a schematic diagram of a vacuum heating gas quenching furnace with system *2plus* system. Compared with the standard vacuum furnace, the system has the advantages of saving energy and reducing the thermal shock to the furnace components, especially the cooling speed can be doubled. Because of these advantages, on the one hand, on the premise of meeting the same quenching effect of the workpiece, the pressure during gas quenching is reduced and the gas consumption is significantly reduced; On the other hand, when using high-pressure gas quenching with the same pressure, the hardening depth of the workpiece can be doubled. Figure 2 (omitted) is the schematic diagram and process curve record of the system *coo plus* vacuum heat treatment system. Because the heating quenching, cryogenic treatment and tempering processes can be completed in the same furnace, it has the following advantages in operation:

the system has a high degree of automation, which avoids the transfer of workpieces between processes

no additional cold treatment equipment is required

no contact with external air in the whole process of the process, The surface is non corrosive

the safety of the system is high

Figure 3 shows the content of residual austenite in the quenched and tempered structures of the surface and heart of cold working alloy tool steel x155crvmo after vacuum heating and high pressure gas quenching and cold treatment at different temperatures. With the decrease of cold treatment temperature, the content of retained austenite in steel decreases. In order to prevent cracking caused by sudden temperature drop of workpiece during cold treatment, the temperature drop speed during cold treatment is reasonably controlled in the system. Mr. Hubert Schulte, the marketing manager of schmets company, also accompanied the delegation to visit harthr company, the company's user. The company has three high-pressure gas quenching furnaces, two gas nitriding furnaces, two plasma nitriding furnaces and other heat treatment and surface treatment equipment of schmets company. The process of the equipment and the logistics system of workpieces are all managed by computers. It is a professional heat treatment plant with modern management level

3. Ipsen International GmbH

Ipsen is an internationally renowned industrial furnace manufacturing company, headquartered in Kleve, Germany, with manufacturing plants in Europe, America and Asia, manufacturing plants in Shanghai and offices in Beijing. Mr. enhofer, the technical president of the company, is the current chairman of the AWT Association for heat treatment and material science. In 2002, he was elected as the Executive Committee of the International Federation of heat treatment and Surface Engineering (IFHTSE). He has been to China for many times to make technical reports and is a well-known expert in the international heat treatment industry

Ipsen's business mainly includes the following technical fields:

atmosphere furnace

atmosphere installations

vacuum furnace

Vacuum installations

coating installations

process technology

measuring technology

control Technology-technology)

automation technology

supervisory technology

Ipsen's main products include sealed box multi-purpose furnace, push rod continuous carburizing furnace, high-pressure gas quenching furnace, vacuum carburizing device, vacuum brazing furnace, various sensors and control devices, including supercab super carburizing technology, avac low-pressure carburizing technology, carb-o-prof carbon potential control system HydroNit hydrogen probe and other technologies have high popularity in China's heat treatment industry. In recent years, Ipsen has developed a number of new heat treatment processes and equipment technologies

3.1 mult-i-cell modular vacuum carburizing system

mult-i-cell is a heat treatment integrated system, or a heat treatment center, composed of multiple equipment modules. The equipment modules of the system mainly include:

vht module vacuum furnace, high temperature module. A typical example is the avac process of Ipsen in vacuum carburizing and the avac-n process in Carbonitriding

vacmobil module - heated vacuum conveying module, which is responsible for the conveying of workpieces between process modules

qgp module - high pressure gas quenching module, the maximum gas quenching pressure can reach 10~20bar according to the process requirements

vdr module tempering can also be used for workpiece pretreatment

high pressure gas storage tank and central pump station

Figure 4 (omitted) shows the two main layout modes of mult-i-cell system, and figure 5 (omitted) shows the field situation of mult-i-cell system

advantages of mult-i-cell system:



integration (process and equipment)


convenient maintenance

3.2 DAC controllable atmosphere tempering furnace with rapid cooling system

the working temperature range of DAC furnace is 150~750 ℃, which can be applied to tempering, annealing, gas nitriding, gas nitrocarburizing, pre oxidation and other processes. Figure 6 (omitted) shows the schematic diagram of DAC furnace

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