Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 02:44, 10. ožujka 2014.

Resistance for the implementation of magnetic operate holding ordinarily begins using a concern for security. These concerns may be allayed by assessing the technologies, holding power and optimal operating situations of magnetic operate holding in terms of operational security.

Despite the competitive Workholding advantages of magnetic workholding in minimizing fees and improving productivity, there nevertheless exists a resistance towards the implementation of magnetic technologies because the major function holder in machining operations. This resistance ordinarily begins using a concern for safety. By assessing the technologies, holding power and optimal operating circumstances of magnetic perform holding relative to operational safety, these issues can 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 an issue of trust: Is this really protected? Even though understandable this opinion is rooted in subjectivity not objective truth. More than probably, individuals who hold this point of view may not fully fully grasp the information of how safe magnetic operate holding is.

So, how can magnetic operate holding be regarded as a secure technology? By definition, it produces a uniform, constant, and infinite holding power that doesn't loosen up, give, or reduce 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 energy named flux. When a workpiece is placed across the poles of these magnets, flux flows into it. When placed within this flux field, a magnetic field of opposite polarity is induced in to the workpiece thereby building a magnetic attraction among the chuck and also the workpiece. This attraction will stay constant, uniform, infinite, and trusted so long as the magnetic field is energized. This reliability makes magnetic workholding a genuinely safe technology.

Magnetic Perform Holding as a Secure Holding Force

Holding power or strength is one more issue regarded as when forming an opinion concerning the safety of magnetic workholding. If an operator does not understand how robust magnetic workholding is, he could mistakenly think magnetic technology just isn't strong enough to perform the job safely. This opinion is often allayed by two facts:

(1) magnetic workholding can possess a clamping energy as much as 1000 daN and

(2) depending upon the application, an instantaneous clamping force of 12 tons per square foot could be generated by magnetic workholders. This amount of holding force is greater than comparable to mechanical clamps with 1 added benefit: magnetic holding force is uniform, continual and infinite until the operator de-energizes it.

Optimal Operating Conditions

To implement magnetic operate holding solutions may perhaps call for some education to know the technology's optimal operating situations. As an example, magnetic work holding is best utilised with smooth-surfaced workpieces as an alternative to rough ones for the reason that the smoothness decreases the air gap between the workpiece and the magnet; compact air gaps raise magnetic attraction and also the holding bond. Some supplies are far better conductors of magnetism than other people. By way of example, annealed materials are ideal even though hardened components don't absorb flux as effortlessly and can retain some magnetism. This situation is usually corrected inside seconds with demagnetization. Ultimately, the direction on the holding force is however another adjustment an operator may have to make to safely implement magnetic operate holding. All magnets have 100 % clamping force directly away in the face with the magnet, but only about 20 % clamping force against side forces. So, the geometry of a reduce has to be considered inside the machining method to reap the advantages of this type of workholding.