Shot peening increases the uptime of tines on soil cultivation implements

Rösler Oberflächentechnik GmbH

Two similar machines for different shot blast applications at Andersen Steel Sp. z o.o.

Equipment for soil cultivation is exposed to extreme loads. In order to increase the life of parts like tines, Andersen Steel Sp. z o.o. is blast-cleaning and shot peening these products in equipment built by Rösler.

Andersen Steel supplies tines and wear parts to agricultural implements like cultivators, grubbers and front packers equipped with vibrating tines for professional soil cultivation. These tines are manufactured in a new plant – Andersen Steel Sp. z o.o. located in Poland utilizing specially arched rolled and flat steel. The tines are shot peened to further improve their wear resistance. However, prior to shot peening the work pieces need to pass through a blast machine first for removing mill scale and other contaminants. For these dual shot blasting requirements Andersen Steel invested in two similar hanger machines, type RHBD 13/18 K. Implementing at Andersen Steel shot peening technology was done under a license agreement between Andersen Steel Sp. z o.o. and the Institute of Precision Mechanics in Warsaw, uses technology patent for an invention No. PL204718 on "Dynamic surface treatment of products". Crucial for the customer’s decision to go with Rösler equipment were successful blasting trials in the Rösler test center. They proved that by shot peening the uptime of the tines could be increased, an improvement that considerably exceeded the expectations of Andersen Steel.

Excellent blast performance with Gamma® 400 G Turbines

Each of the two hanger blast machines is equipped with eight (8) Gamma® 400G turbines with an installed power of 15 kW each. Compared to conventional blast wheels this newly developed Rösler turbine type offers a 15 – 20% higher blast performance with significantly increased uptime of wear parts. Pairs of two turbines located in the four corners of the blast chamber are bombarding the tines with media. The turbine positioning is such that the individual blast patterns are not overlapping, which ensures perfect blast coverage on the tines. Since different work piece types require different media throwing speeds, the turbines are equipped with variable frequency drives.

One common transport system for all manufacturing steps

After the shaping process 16, respectively, 25 work pieces are attached to the transport system on special carriers. They are then passing through the various stages; blast-cleaning, shot peening, painting and drying.

For an optimum workflow the two shot blast machines are arranged sequentially in the building. But their operation is entirely independent from each other. Three (3) meter long vestibules equipped with multiple overlapping curtains and placed on the inlet and outlet side of the blast chamber prevent blast media from spilling out of the machine. A sensor recognizes when a carrier enters the inlet vestibules and sends a signal to the machine controls to start the blast process.

Overhead Rail Machines RHBD 13/18 K
Overhead Rail Machines RHBD 13/18 K

The work pieces are passing through two identical, sequentially arranged hanger machines for blast-cleaning and subsequent shot peening.

Agricultural Equipment

During operation the vibrating tines of the cultivators are exposed to heavy loads. With shot peening their uptime could be significantly increased.

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