09/14/2011

www.gupta-verlag.de/rubber

Desma Tec: Fully automatic production of automotive spring aids

[image_0]The unit allows, just as previous versions, the colour change from shot to shot. The mixing head is designed for four colours, additives or catalysts in addition to four components. The component change is also possible from shot to shot. The injection PU units are mainly installed in the automotive area to produce air springs for cars. According to Desma, the global demand for spring aids made of polyurethane is increasing year by year. The main reason is the rising prosperity in emerging markets like Brasil, India and China, which results in an increasing demand for mobility, especially cars. The tremendous export rates of German car suppliers are showing this effect. The second reason is the substitution of rubber products by polyurethane products: Bumpers made of polyurethane are getting more and more popular. Desma Tec, a division of Klöckner Desma Shoe Machinery GmbH, located in Achim near Bremen in the northern part of Germany, is specialised in the production of machinery to produce bumpers. The spring aids are injection moulded on fully automated rotary tables. The moulds are designed with multiple cavities. Depending on the part size, up to eight cavities are possible in a single mould. The release agent is usually spray-applied by robots. No manual work is necessary. After cutting the runner system, the air springs are de-moulded from the cores. Afterwards, they normally pass a printer for labelling the production codes for quality control reasons. With this help, the tier 1 suppliers know at every time when the parts have been produced. After printing the products online, they have to be separated and stocked. A container management system takes care of stocking them correctly sorted in the right boxes. After finishing them (trimming the flush away) they are ready for shipment. Machines of this type can produce 1 600 parts/hour, which comes to approximately 9 million bumpers per year in a three-shift system with 240 days production per year, says the company. Furthermore, it is not only possible to produce springs aids for the automotive industry on the so called Bumperspeed machines. Bumpers for the elevator- and crane industries can also be produced on these machines. In these sectors, customers often request to mould in inserts in the bumpers for assembly reasons later on. These inserts are usually steel plates or the like. Often camera systems are installed into the manufacturing equipment to ensure the correct insert is placed in the right mould and to avoid crashes in the mould. The heating of the moulds can vary according to customer requirements. The standard design is medium temperation. However, it is also easily possible to electrically heat the moulds. Another feature of the Desma equipment is the fast component and colour change from shot to shot. Up to four main components and four colours, additives or catalysts can be driven at the same time. According to Desma, it is also possible to run two different polyols and isocyanates parallel to each other. With this dosing, it is possible to produce different qualities or coloured products.

www.gupta-verlag.de/rubber