Abrasive Belt Grinding Technology
Abrasive bands achieve great chipping of 1.2 mm per meter and fine ï diameters and more as well as a surface improvement of Ra 0.1.
Application range:
Grinding and polishing to improve the finish of small, medium and large jobs, round and sectional pipes; hydraulic, pneumatic and pressure cylinders; axles, cylinders and rollers; engine components, stamped and sintered parts; deburring and edge finishing; removing scales; Teflon coating, processing before and after coating, etc.
Materials:
Stainless steel, alloyed steel, copper, brass, aluminum, zirconium, chrome-finishes, coatings, ceramics, synthetics, etc.
There is no process to achieve great chipping and a mirror finish in one single processing phase. Abrasive belt grinding is a "step-by-step" process.
Depending on the desired finish, several passes using various abrasive belt grains are frequently required in the single station systems.
The number of passes depends on the condition of the material.
A high rate of material removal can be achieved with a 40-60 belt grain.
An average rate of material removal can be achieved with a 80-240 belt grain.
These grains, however, leave a very rough structure.
A visually more beautiful finish is achieved with a belt grain of 280-400.
The work pieces are processed with a 400-600 grain for subsequent chrome-plating.
The surface must be processed with abrasive belts for subsequent chrome-plating of the work pieces.
For example:
Piston rods with a good initial surface, which require an end finish of 0.15 - 0.2 µm Ra prior to chrome-plating are finished with the following three grinding grains:
240 or 320,
400 or 600,
800 or cork belt.
Multi-station systems can perform several grinding operations economically and quickly in one pass – without a belt change and fully automatic with a magazine.
The multi-station system increases the capacity and reduces the handling cost considerably, since several working cycles can be completed in one pass.
Limitations of the process
M is reached under normal production conditions. Precise machine adjustments of ï surface roughness of Ra 0.15-0.25 mï and the related materials make a surface roughness of up to Ra 0.04 possible. Expert knowledge and excellent preparation of the material are required.
Super-finishing machines are offered by Löser for specific ï for surfaces of more than Ra 0.04. Surface improvements of up to Ra 0.004 µm can easily be achieved with super-finish machines! (Refer to super-finish technology)
Dry grinding increases the material removal, however, these benefits cannot be used in many cases, since the grinding temperature increases too much. This causes bending and prevents a maximum contact pressure. Dry grinding also reduces the service life of the grinding belt.
Working with water/emulsions provides many benefits and
- Eases the contact of the grinding belt
- Reduces the temperature of the work piece
- Reduces the risk that the pipe becomes distorted
- Extends the service life of the grinding belt,
- Reduces the noise and prevents the development of dust
Feeding devices:
The simplest form of feeding the material consists of a V-shaped section. Highly developed feeding devices are based on power-operated roller conveyors or vibrating conveyors. The selection of the guides is therefore aimed at the work piece dimensions and the required accuracy.
Handling:
Handling of the pipes is as important as grinding. Unnecessary handling considerably inhibits the economy of the system. The magazine, combined with an automatic loading and unloading system, completes the picture of a fully automated operation. Magazines are available in various designs and in various sizes and can be implemented for all work pieces.
The modular construction considers customer's requests; anything is possible, from a low-cost model up to a fully automated layout.
We would be pleased in assisting you to gain from our experience that extends over more than 70 years.
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