When Baosteel, China’s largest steel supplier, decided to develop press hardening technology for its own purposes, they turned to AP&T for equipment and process expertise. Together, the companies developed a complete press hardening process that Baosteel will use when developing future production solutions for the automotive industry.
The automotive industry’s focus on combining weight savings with increased impact safety has generated great interest in press hardening as a manufacturing method. This method makes it possible to manufacture components that are both low in weight and have an extremely good ability to absorb energies thanks to a hardening process that makes the material up to three times stronger than standard steel. The potential of creating high-quality components with high strength at an attractive price has gotten the ball rolling.
Partner with the whole package
AP&T was contacted
by steel giant Baosteel, who was in search of a partner with expertise on
the entire press hardening process – from blank feeding, heating and press
feeding to press hardening and ejection. Baosteel contacted and evaluated
many suppliers, but in the end they put their faith in AP&T.
Good references important
“We had limited experience
in press hardening and needed a partner who has knowledge of the process
and can deliver a turnkey solution,” explains Dr. Xu, head researcher at
Baosteel.
“AP&T also had several press hardening projects under their belt with
many good references to show for it. That was important to us.”
Strong yet light components
In their development work, Baosteel and AP&T focused on the process of
forming a passenger car B-pillar – a component that is a typical example of
what press hardening is currently used for. This must effectively absorb
impact energy yet be low in weight.
“We are extremely pleased with the results of development with AP&T.
This bodes well for the future,” says Dr. Xu.
Complete line
The first part of the line consists of
an oven that heats the sheet metal to 950° C. After heating, there is only
a limited amount of time to shape the piece before the temperature drops,
so a customized SpeedFeeder press robot picks up the glowing hot pieces and
positions them in the AP&T press hardening press. The press tool is
closed and the piece is formed into a finished B-pillar while being quickly
cooled and obtaining its strong material properties. Naturally, the entire
line is controlled by AP&T's LOGOS control system, which gives full
control of every step of the forming process.
Investing in the future
The press hardening line delivered by AP&T will be an important
development resource in Baosteel's operations in Shanghai, China. The
company's ambition is to increase the degree of refinement in their
production and expand their product range. They want to be able to offer
more installation-ready components to the automotive industry.
“Partnering with AP&T gives us a competitive edge as a direct supplier
to the automotive industry. We already have the raw material – steel,”
states Dr. Xu.
Advanced tool
The tool was developed in close collaboration between the companies. It is
an advanced design with integrated cooling so that the temperature of the
component can be rapidly reduced, giving it the right material structure.
The B-pillar formed in the tool has an extremely advanced geometry with
radii that have been great challenges. And Baosteel is impressed.
“We now know in uncertain terms that AP&T is an expert at developing
tool solutions for press hardening,” says Dr. Xu.
Just the beginning?
The development line that
AP&T delivered to Baosteel will most likely be followed by production
lines in which the steel supplier will produce other safety components for
future car models. And Baosteel is already setting its sights on the
future.
“We are extremely pleased with the collaboration and hope to continue with
production solutions,” says Dr. Xu.
