Assessing The Security Of Magnetic Workholding

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Resistance to the implementation of magnetic work holding ordinarily begins with a concern for security. These concerns can be allayed by assessing the technology, holding energy and optimal operating circumstances of magnetic function holding with regards to operational security.

In spite of the competitive aerospace machining advantages of magnetic workholding in decreasing charges and improving productivity, there still exists a resistance towards the implementation of magnetic technology as the primary function holder in machining operations. This resistance commonly begins having a concern for safety. By assessing the technology, holding power and optimal operating conditions of magnetic operate holding relative to operational security, these concerns is often allayed.

Magnetic Operate Holding as a Protected Technology

If a machine operator has held workpieces with mechanical clamps for decades, the idea of relying on magnetism to hold workpieces, especially in heavy milling operations, boils down to a problem of trust: Is this actually safe? Though understandable this opinion is rooted in subjectivity not objective fact. Greater than most likely, those that hold this point of view may not totally realize the facts of how secure magnetic perform holding is.

So, how can magnetic function holding be deemed as a secure technologies? By definition, it produces a uniform, consistent, and infinite holding power that does not relax, give, or lower till an operator de-energizes it.

In general, magnetic operate holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Each magnet includes a north and south pole across which flows magnetic energy known as flux. When a workpiece is placed across the poles of those magnets, flux flows into it. When placed within this flux field, a magnetic field of opposite polarity is induced in to the workpiece thereby generating a magnetic attraction amongst the chuck as well as the workpiece. This attraction will remain constant, uniform, infinite, and dependable provided that the magnetic field is energized. This reliability makes magnetic workholding a really secure technologies.

Magnetic Work Holding as a Safe Holding Force

Holding energy or strength is one more element regarded as when forming an opinion regarding the safety of magnetic workholding. If an operator doesn't know how sturdy magnetic workholding is, he may mistakenly believe magnetic technologies just isn't robust adequate to accomplish the job safely. This opinion may be allayed by two facts:

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

(2) depending upon the application, an instantaneous clamping force of 12 tons per square foot is often generated by magnetic workholders. This amount of holding force is more than comparable to mechanical clamps with one more advantage: magnetic holding force is uniform, continual and infinite until the operator de-energizes it.

Optimal Operating Conditions

To implement magnetic operate holding solutions may possibly need some education to understand the technology's optimal operating conditions. As an example, magnetic perform holding is most effective applied with smooth-surfaced workpieces instead of rough ones simply because the smoothness decreases the air gap amongst the workpiece along with the magnet; modest air gaps improve magnetic attraction plus the holding bond. Some components are superior conductors of magnetism than others. By way of example, annealed components are perfect whilst hardened components do not absorb flux as conveniently and can retain some magnetism. This situation might be corrected inside seconds with demagnetization. Lastly, the path with the holding force is however yet another adjustment an operator may have to create to safely implement magnetic perform holding. All magnets have one hundred percent clamping force directly away from the face in the magnet, but only about 20 % clamping force against side forces. So, the geometry of a reduce has to be regarded inside the machining method to reap the positive aspects of this sort of workholding.