The use of a metal polishing machine is a fundamental step in metal surface finishing processes that require precise and perfectly finished surfaces. Using abrasive systems such as belts, discs, or grinding wheels, the machine removes burrs, oxides, and surface defects, improving the quality and appearance of the components.
This technology is widely used in metal polishing processes in both artisanal contexts and automated industrial lines, where it helps to ensure uniformity of finish, consistent quality, and proper preparation of metal surfaces for subsequent treatments.
Requirements:
Work surface position control
Learn more
Control of the position of the blade
Learn more
Brush position control
Learn more
Requirement:
Work surface position control
Accurate detection of the work surface height is essential because it is the main reference point for positioning the abrasive components. This value defines the zero point from which the correct movement is determined during all machining phases.
Knowing this height exactly allows you to set the initial distance, accurately establish the finishing depth, and ensure that the working head always advances under ideal operating conditions.
Solution:
WPG series contactless magnetostrictive linear position sensors are used for precise control of the work surface height . The contactless technology eliminates mechanical wear between the sensor and the slider, ensuring long operating life and reliability over time. The availability of magnetic slide or floating sliders allows for easy integration into different machine configurations, ensuring high measurement accuracy thanks to linearity, repeatability, and low hysteresis.
- Strokes from 50 mm to 1500 mm
- Magnetic slide or floating slider
- Analog voltage or current outputs
With the WPG series, Gefran offers solutions designed to ensure precision, reliability, and operational continuity in metal surface finishing applications.
Requirement:
Control of the position of the blade
In metal polishing machines equipped with abrasive belts, it is essential to accurately monitor the position of the abrasive element, which generally does not undergo significant deformation during processing.
Direct measurement of the position allows accurate control of the machining depth, avoiding excessive or irregular material removal.
Solution:
PY series potentiometric linear position sensors with probe are used for precise position monitoring in metal polishing machines with abrasive belts . The compact structure and integrated return spring ensure that the stem automatically returns to its initial position, guaranteeing stable and reliable measurement even in confined installation spaces.
- Strokes from 25 to 150 mm
- Independent linearity up to ±0.05%
- 3- or 5-pole electrical connections
With the PY series, Gefran offers solutions designed to guarantee measurement accuracy, reliability, and ease of integration in metal surface finishing applications.
Requirement:
Brush position control
In metal polishing machines, abrasive brushes are particularly suitable due to their ability to adapt to the profile of the workpiece and ensure a uniform surface finish. This solution is often used in processes that require high aesthetic quality or the treatment of irregular surfaces.
To achieve consistent results, it is essential to precisely control the operating position of the brushes, ensuring the correct point of contact with the workpiece. Inaccurate positioning can generate uneven pressure or reduce the quality of the finish, while correct adjustment maintains stable machining depth and process continuity.
Solution:
LT series potentiometric linear position sensors are used for precise control of brush height in metal polishing machines . Proprietary resistive technology ensures robustness and reliability even in the presence of vibrations, while ease of installation facilitates integration into different machine configurations.
- Strokes from 50 mm to 1350 mm
- 3- to 5-pole electrical connections
- IP60, IP65, or IP67 protection rating
With the LT series, Gefran offers solutions designed to guarantee measurement accuracy, operational stability, and long-term reliability in metal surface finishing applications.
Operating principle:
The operation of a metal polishing machine is based on the controlled removal of material from the surface of the workpiece through the action of moving abrasive elements. During the process, the component is positioned in the operating area while the abrasive tool, typically abrasive belts or brushes, rotates or slides at a regulated speed.
The abrasive belt, consisting of a flexible backing covered with abrasive grains, runs on motorized rollers and ensures uniform processing thanks to automatic control of tension, centering, and distance from the workpiece. This solution is particularly effective for achieving a consistent metal surface finish even on large surfaces.
Abrasive brushes, made with impregnated bristles or metal wires, perform a more delicate and adaptable action. Rotating with controlled pressure, they are ideal for deburring edges, satin finishing surfaces, and finishing complex areas.
Overall, the metal polishing process allows for a consistent and repeatable finish, thanks to the combination of motors, control systems, and position sensors that ensure stability and precision during processing.
Requirements and technology:
To ensure an accurate and repeatable metal polishing process it is essential to precisely control the interaction between the abrasive elements and the workpiece positioned on the work surface. Continuous monitoring of their positioning allows the contact pressure to be maintained within optimal parameters, avoiding both excessive material removal and an uneven surface finish.
Controlling the position of the abrasive elements also allows the machine to compensate for progressive tool wear, any geometric variations, and oscillations that could compromise the uniformity and quality of the machining. In this way, it is possible to precisely adjust the feed of the working head while maintaining a constant machining depth.
This continuous control also contributes to operational safety, preventing movements beyond the set limits and preventing overload conditions. Overall, accurate positioning management improves precision, repeatability, tool life, and machine reliability.