Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 03:36, 10. ožujka 2014.

Resistance for the implementation of magnetic perform holding usually starts having a concern for security. These issues is often allayed by assessing the technology, holding energy and optimal operating circumstances of magnetic function holding with regards to operational safety.

Despite the competitive Workholding benefits of magnetic workholding in lowering expenses and improving productivity, there nonetheless exists a resistance to the implementation of magnetic technologies as the major work holder in machining operations. This resistance ordinarily starts having a concern for safety. By assessing the technology, holding energy and optimal operating conditions of magnetic perform holding relative to operational security, these issues is usually allayed.

Magnetic Operate Holding as a Protected Technology

If a machine operator has held workpieces with mechanical clamps for decades, the concept of relying on magnetism to hold workpieces, in particular in heavy milling operations, boils down to a problem of trust: Is this genuinely protected? While understandable this opinion is rooted in subjectivity not objective reality. More than most likely, people who hold this point of view may not totally realize the facts of how protected magnetic operate holding is.

So, how can magnetic work holding be considered as a protected technologies? By definition, it produces a uniform, constant, and infinite holding energy that doesn't unwind, give, or reduce till an operator de-energizes it.

Normally, magnetic perform holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Every single 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 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 in between the chuck as well as the workpiece. This attraction will stay consistent, uniform, infinite, and trustworthy as long as the magnetic field is energized. This reliability makes magnetic workholding a truly protected technologies.

Magnetic Work Holding as a Secure Holding Force

Holding power or strength is a different issue thought of when forming an opinion in regards to the security of magnetic workholding. If an operator will not understand how strong magnetic workholding is, he might mistakenly think magnetic technology is not powerful enough to complete the job safely. This opinion might be allayed by two details:

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

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

Optimal Operating Circumstances

To implement magnetic operate holding solutions might require some education to know the technology's optimal operating situations. By way of example, magnetic function holding is finest employed with smooth-surfaced workpieces in lieu of rough ones simply because the smoothness decreases the air gap between the workpiece as well as the magnet; compact air gaps improve magnetic attraction plus the holding bond. Some materials are much better conductors of magnetism than others. One example is, annealed components are ideal although hardened materials don't absorb flux as conveniently and can retain some magnetism. This situation may be corrected within seconds with demagnetization. Ultimately, the path on the holding force is however yet another adjustment an operator may have to make to safely implement magnetic perform holding. All magnets have 100 % 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 should be viewed as within the machining approach to reap the benefits of this type of workholding.