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The deburring process - The process for burr-free workpieces

Every kind of machining process leaves behind a burr that could become an injury hazard during further machining and assembly. Burrs can also cause parts to malfunction, with a negative impact the end product.

In addition to manufacturing the deburring machine, SEMA also performs testing in advance to determine the specific DEBURRING process to be used. This method prevents any surprises when the machine is completed.

 

Mechanical deburring can be performed with the following tools:

 

  • Steel brushes (no impact effect)
  • Plastic brushes (grinding effect)
  • Milling pins (removal of larger primary burrs)
  • Grinding rods
  • Textile discs
  • Non-woven discs
  • Polishing discs

Wear compensation

The machine control automatically compensates for tool attrition. This can be done in various ways:

 

  • Empirically determined values: i.e. the part count or the time for adjusting the unit is entered into the control. This can take place in several steps (up to 4 steps); the individual bristles become shorter and harder based on the level of brush wear. Performing this adjustment in several steps ensures that the amount removed from the part is always correct.

  • Pressure regulation: the control is configured with a pressure value that specifies the force with which the tool is pressed against the part. This can be regulated via a pressure regulation value.

  • Power consumption: a specific range of power consumption to be met during machining is defined. If the consumption deviates from this range, the NC axis automatically adjusts.

Configuration of the control

Diameter of a new tool and diameter of the worn tool. Based on these values, the control independently calculates the position to which the part must be moved. Once the position of the worn tool is reached, the machining unit moves to the tool change position and displays a message on the control panel. The operator replaces the worn tool with a new tool and confirms the tool change. The machining unit then moves back to the position of the new tool.

Process parameters

Various rotational speeds can be set on the tool and workpiece using frequency inverters.

If there are several machining directions, these can be optimally adjusted with different machining times, depending on the burr size.

The machining unit can be positioned with high precision (insertion depth) by numerically controlled (NC) feed axes.