Assessing The Safety Of Magnetic Workholding

Izvor: KiWi

Inačica od 03:36, 10. ožujka 2014.

Resistance for the implementation of magnetic operate holding usually begins having a concern for security. These concerns might be allayed by assessing the technology, holding energy and optimal operating conditions of magnetic perform holding when it comes to operational safety.

Regardless of the competitive workholding solutions advantages of magnetic workholding in reducing fees and enhancing productivity, there nevertheless exists a resistance for the implementation of magnetic technology as the major perform holder in machining operations. This resistance normally begins having a concern for safety. By assessing the technologies, holding power and optimal operating conditions of magnetic work holding relative to operational safety, these issues may be allayed.

Magnetic Work Holding as a Safe Technology

If a machine operator has held workpieces with mechanical clamps for decades, the concept of relying on magnetism to hold workpieces, specially in heavy milling operations, boils down to an issue of trust: Is this seriously safe? Although understandable this opinion is rooted in subjectivity not objective reality. More than most likely, people that hold this point of view may not fully have an understanding of the facts of how secure magnetic function holding is.

So, how can magnetic work holding be regarded as a protected technology? By definition, it produces a uniform, consistent, and infinite holding power that doesn't relax, give, or decrease till an operator de-energizes it.

Generally, magnetic function holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Every magnet has a north and south pole across which flows magnetic power known as flux. When a workpiece is placed across the poles of those magnets, flux flows into it. When placed in this flux field, a magnetic field of opposite polarity is induced into the workpiece thereby making a magnetic attraction among the chuck and the workpiece. This attraction will stay consistent, uniform, infinite, and trusted so long as the magnetic field is energized. This reliability makes magnetic workholding a definitely secure technology.

Magnetic Work Holding as a Protected Holding Force

Holding energy or strength is a different factor viewed as when forming an opinion concerning the safety of magnetic workholding. If an operator will not understand how robust magnetic workholding is, he may mistakenly think magnetic technologies isn't strong sufficient to complete the job safely. This opinion could be allayed by two facts:

(1) magnetic workholding can possess a clamping energy up to 1000 daN and

(two) based upon the application, an instantaneous clamping force of 12 tons per square foot is often generated by magnetic workholders. This level of holding force is more than comparable to mechanical clamps with a single added benefit: magnetic holding force is uniform, constant and infinite till the operator de-energizes it.

Optimal Operating Conditions

To implement magnetic function holding solutions could require some instruction to understand the technology's optimal operating situations. For example, magnetic function holding is ideal used with smooth-surfaced workpieces rather than rough ones mainly because the smoothness decreases the air gap between the workpiece plus the magnet; small air gaps boost magnetic attraction along with the holding bond. Some materials are superior conductors of magnetism than other individuals. For example, annealed components are perfect while hardened materials don't absorb flux as quickly and will retain some magnetism. This situation is usually corrected inside seconds with demagnetization. Lastly, the direction from the holding force is yet one more adjustment an operator may have to make to safely implement magnetic operate holding. All magnets have 100 percent clamping force directly away in the face on the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a reduce should be regarded in the machining approach to reap the advantages of this sort of workholding.