Assessing The Safety Of Magnetic Workholding

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Resistance to the implementation of magnetic function holding generally begins with a concern for safety. These issues can be allayed by assessing the technologies, holding power and optimal operating circumstances of magnetic operate holding when it comes to operational security.

Despite the competitive Workholding advantages of magnetic workholding in reducing costs and enhancing productivity, there nonetheless exists a resistance to the implementation of magnetic technologies as the key work holder in machining operations. This resistance ordinarily starts having a concern for security. By assessing the technologies, holding power and optimal operating conditions of magnetic function holding relative to operational security, these issues is usually allayed.

Magnetic Work Holding as a Protected 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 genuinely safe? Whilst understandable this opinion is rooted in subjectivity not objective reality. More than most likely, those who hold this point of view may not totally comprehend the details of how protected magnetic function holding is.

So, how can magnetic perform holding be considered as a secure technology? By definition, it produces a uniform, constant, and infinite holding energy that does not relax, give, or reduce until an operator de-energizes it.

Generally, magnetic work holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Every magnet has a north and south pole across which flows magnetic energy called 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 building a magnetic attraction between the chuck and also the workpiece. This attraction will stay constant, uniform, infinite, and trustworthy as long as the magnetic field is energized. This reliability makes magnetic workholding a definitely secure technology.

Magnetic Function Holding as a Secure Holding Force

Holding energy or strength is another issue regarded when forming an opinion regarding the security of magnetic workholding. If an operator doesn't know how sturdy magnetic workholding is, he may perhaps mistakenly think magnetic technologies isn't strong enough to do 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 is usually generated by magnetic workholders. This amount of holding force is more than comparable to mechanical clamps with 1 extra benefit: magnetic holding force is uniform, continuous and infinite until the operator de-energizes it.

Optimal Operating Conditions

To implement magnetic operate holding options may well need some training to know the technology's optimal operating circumstances. By way of example, magnetic work holding is greatest made use of with smooth-surfaced workpieces rather than rough ones due to the fact the smoothness decreases the air gap involving the workpiece and also the magnet; little air gaps increase magnetic attraction and also the holding bond. Some materials are far better conductors of magnetism than other individuals. By way of example, annealed components are ideal even though hardened components never absorb flux as effortlessly and can retain some magnetism. This condition might be corrected inside seconds with demagnetization. Ultimately, the direction with the holding force is yet a different adjustment an operator might have to make to safely implement magnetic perform holding. All magnets have 100 % clamping force directly away from the face in the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a reduce must be considered in the machining method to reap the benefits of this kind of workholding.