Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 02:50, 10. ožujka 2014.

Resistance for the implementation of magnetic work holding generally begins having a concern for safety. These issues is usually allayed by assessing the technology, holding energy and optimal operating conditions of magnetic function holding when it comes to operational security.

In spite of the competitive aerospace machining benefits of magnetic workholding in minimizing fees and improving productivity, there still exists a resistance towards the implementation of magnetic technology as the key operate holder in machining operations. This resistance usually begins having a concern for safety. By assessing the technologies, holding energy and optimal operating conditions of magnetic function holding relative to operational safety, these issues could be allayed.

Magnetic Work Holding as a Secure Technologies

If a machine operator has held workpieces with mechanical clamps for decades, the idea of relying on magnetism to hold workpieces, specially in heavy milling operations, boils down to a problem of trust: Is this truly safe? Although understandable this opinion is rooted in subjectivity not objective reality. More than most likely, individuals who hold this point of view may not totally have an understanding of the details of how safe magnetic operate holding is.

So, how can magnetic operate holding be regarded as a protected technologies? By definition, it produces a uniform, consistent, and infinite holding power that will not loosen up, give, or reduce until 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. Every 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 in this flux field, a magnetic field of opposite polarity is induced in to the workpiece thereby building a magnetic attraction between the chuck along with the workpiece. This attraction will remain constant, uniform, infinite, and dependable provided that the magnetic field is energized. This reliability makes magnetic workholding a definitely secure technologies.

Magnetic Operate Holding as a Safe Holding Force

Holding energy or strength is an additional element regarded as when forming an opinion concerning the security of magnetic workholding. If an operator will not understand how powerful magnetic workholding is, he may mistakenly believe magnetic technology is not powerful enough to complete the job safely. This opinion can be allayed by two information:

(1) magnetic workholding can have a clamping power as much as 1000 daN and

(2) based upon the application, an instantaneous clamping force of 12 tons per square foot may be generated by magnetic workholders. This level of holding force is greater than comparable to mechanical clamps with one particular further benefit: magnetic holding force is uniform, continual and infinite until the operator de-energizes it.

Optimal Operating Circumstances

To implement magnetic work holding options may well need some coaching to know the technology's optimal operating conditions. For instance, magnetic operate holding is greatest employed with smooth-surfaced workpieces as opposed to rough ones for the reason that the smoothness decreases the air gap among the workpiece plus the magnet; modest air gaps improve magnetic attraction plus the holding bond. Some supplies are superior conductors of magnetism than others. One example is, annealed components are best though hardened supplies don't absorb flux as simply and will retain some magnetism. This situation is often corrected within seconds with demagnetization. Lastly, the path in the holding force is yet one more adjustment an operator might have to create to safely implement magnetic perform holding. All magnets have 100 percent clamping force directly away from the face from the magnet, but only about 20 % clamping force against side forces. So, the geometry of a cut must be considered in the machining approach to reap the benefits of this sort of workholding.