Assessing The Safety Of Magnetic Workholding

Izvor: KiWi

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

Despite the competitive aerospace machining advantages of magnetic workholding in minimizing costs and improving productivity, there nonetheless exists a resistance to the implementation of magnetic technology because the primary perform holder in machining operations. This resistance normally starts using a concern for safety. By assessing the technology, holding power and optimal operating circumstances of magnetic function holding relative to operational safety, these concerns can be allayed.

Magnetic Perform 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, particularly in heavy milling operations, boils down to a problem of trust: Is this genuinely safe? When understandable this opinion is rooted in subjectivity not objective truth. More than probably, individuals who hold this point of view may not fully understand the facts of how secure magnetic function holding is.

So, how can magnetic work holding be considered as a secure technology? By definition, it produces a uniform, consistent, and infinite holding energy that does not loosen up, give, or lower till an operator de-energizes it.

Normally, magnetic operate holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Each and every magnet features a north and south pole across which flows magnetic power referred to as flux. When a workpiece is placed across the poles of these magnets, flux flows into it. When placed in this flux field, a magnetic field of opposite polarity is induced into the workpiece thereby generating a magnetic attraction among the chuck as well as the workpiece. This attraction will remain consistent, uniform, infinite, and trustworthy as long as the magnetic field is energized. This reliability makes magnetic workholding a definitely safe technology.

Magnetic Function Holding as a Protected Holding Force

Holding energy or strength is a further issue regarded as when forming an opinion about the security of magnetic workholding. If an operator does not know how strong magnetic workholding is, he may well mistakenly believe magnetic technologies will not be powerful enough to complete the job safely. This opinion could be allayed by two details:

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

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

Optimal Operating Situations

To implement magnetic perform holding solutions may perhaps demand some coaching to know the technology's optimal operating situations. For instance, magnetic function holding is most effective employed with smooth-surfaced workpieces in lieu of rough ones due to the fact the smoothness decreases the air gap amongst the workpiece and the magnet; little air gaps increase magnetic attraction plus the holding bond. Some supplies are superior conductors of magnetism than others. By way of example, annealed materials are ideal whilst hardened supplies don't absorb flux as conveniently and can retain some magnetism. This condition could be corrected within seconds with demagnetization. Finally, the direction from the holding force is but yet another adjustment an operator may have to produce to safely implement magnetic operate holding. All magnets have one hundred % clamping force directly away in the face in the magnet, but only about 20 % clamping force against side forces. So, the geometry of a reduce should be thought of inside the machining method to reap the advantages of this kind of workholding.