Automobile manufacturers are increasing their use of high strength steel that can achieve weight reduction of steel while maintaining equal strength to conventional steel as this allows them to achieve compatibility between reduced fuel consumption by lighter body weight and improvement in collision safety. Topy has been working on the use of high strength hot-rolled special sections for truck and bus wheel application.A challenging issue for raw material was how uniform strength is attained. We have succeeded in commercial production thanks to our inherent hot-rolling technologies in controlling material thickness and temperature.
Automobile industry works on developing various environmentally friendly technologies including emission gas control and low fuel cost cars. Conventional wheel balance weights were made of lead.
However, from a standpoint of hazardous substance control and environment conservation, we changed the material from lead to steel, and developed a universal design allowing smooth fitting to the inside of the wheel. Steel adhesive balance weights can be attached to any wheel size.
This is an example that our steel processing technology including high-speed cutting, automatic attachment of dual face adhesive tape is applied in a practical way.
Surface treatment of aluminum alloy wheel has long been designed with a focus on long-term corrosion resistance and anti-discoloring, and treatment with chromium has been thought vital for anti-corrosion. However, in view of the environmental regulations in Europe, Japanese automobile manufacturers have started to pay attention to a surface treatment without using heavy metal like chromium.
Topy has spent substantial time to study alternative materials to replace chromium technological development, and has succeeded in chromium-free process for the first time in the world.