With regards to mechanical aspects, the inspection focuses on geometry, any &#;clearances&#;, and a visual observation of mechanical parts.
Maurice Schauli adds that &#;machine operators are our first &#;indicators&#;, with their eyes, sensations, etc. Vibrations, noises, or any other observations are valuable clues that need to be explored.&#;
Gears &#; an Essential Element
A gear reducer, at the heart of a mechanical press, transforms the motor&#;s rotational movement into a travelling motion of the slide(s), in order to power the process, via the slide on which the tool is fixed. The reducer is made up of gears, connecting rods, shafts with bearings, lots of bushes, etc.
When these parts become worn, the machine becomes less precise. Clearances can be measured during the inspection of a press, via two main operations:
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a visual inspection of the condition of parts,
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the gaps/clearances on the machine by means of analysis, such as the use of a jack. The latter makes it possible to simulate a force under the slide, as when the press is in operation. The movement of the slide represents the sum of the clearances and part of the deformation.
"If the clearances are different on either side of the kinematics, the geometry will never be perfect in the tool lab (i.e. under the press slides where the tool is inserted), which is problematic. The parallelism of the surfaces that accommodate the upper and lower tool must be good,&#; Maurice Schauli comments.
Wear is most frequently observed on the bushes. Parts that are not considered wear parts, such as gear teeth, can also cause stoppages. Maurice Schauli explains that &#;preventative inspection allows to limit the risks. It is therefore particularly interesting to provide for a general mechanical overhaul based on these inspections in order to replace any old parts that may lead to fatigue failure, i.e. a risk of breakage.&#;
If the press has been poorly maintained, or is in use for a long time, it is sometimes necessary to completely change the kinetics, i.e. all the transmission elements.
General Mechanical Overhaul
Equipment reliability is the first reason that justifies a general mechanical overhaul, in terms of both breakage and the quality of manufactured parts.
Productivity can also be increased, e.g. an increase in capacity, especially in terms of output and therefore the number of parts produced per minute, etc.
&#;These changes in capacity are nevertheless limited to the possibilities allowed by the structure of the press.&#;
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