Assessing The Safety Of Magnetic Workholding

Izvor: KiWi

Inačica od 05:47, 10. ožujka 2014.

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

Regardless of the competitive aerospace machining rewards of magnetic workholding in decreasing charges and improving productivity, there nonetheless exists a resistance to the implementation of magnetic technology as the principal work holder in machining operations. This resistance usually begins with a concern for safety. By assessing the technology, holding energy and optimal operating situations of magnetic function holding relative to operational safety, these concerns is often allayed.

Magnetic Function 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, specifically in heavy milling operations, boils down to a problem of trust: Is this truly safe? Even though understandable this opinion is rooted in subjectivity not objective reality. Greater than most likely, individuals who hold this point of view might not fully fully grasp the facts of how protected magnetic function holding is.

So, how can magnetic perform holding be considered as a protected technologies? By definition, it produces a uniform, consistent, and infinite holding energy that will not unwind, give, or lower till an operator de-energizes it.

In general, magnetic function holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Every single magnet includes a north and south pole across which flows magnetic power called flux. When a workpiece is placed across the poles of these magnets, flux flows into it. When placed in this flux field, a magnetic field of opposite polarity is induced in to the workpiece thereby producing a magnetic attraction between the chuck plus the workpiece. This attraction will stay constant, uniform, infinite, and trustworthy provided that the magnetic field is energized. This reliability makes magnetic workholding a actually protected technology.

Magnetic Work Holding as a Safe Holding Force

Holding energy or strength is a different issue viewed as when forming an opinion about the security of magnetic workholding. If an operator will not understand how strong magnetic workholding is, he could mistakenly think magnetic technology will not be sturdy sufficient to perform the job safely. This opinion can be allayed by two information:

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

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

Optimal Operating Circumstances

To implement magnetic work holding solutions might require some education to understand the technology's optimal operating conditions. One example is, magnetic perform holding is most effective utilized with smooth-surfaced workpieces as opposed to rough ones since the smoothness decreases the air gap in between the workpiece plus the magnet; smaller air gaps improve magnetic attraction as well as the holding bond. Some supplies are improved conductors of magnetism than other individuals. For example, annealed components are best whilst hardened supplies never absorb flux as effortlessly and can retain some magnetism. This condition might be corrected within seconds with demagnetization. Lastly, the direction in the holding force is however one more adjustment an operator might have to produce to safely implement magnetic operate holding. All magnets have one hundred % clamping force directly away from the face with the magnet, but only about 20 % clamping force against side forces. So, the geometry of a reduce has to be considered in the machining procedure to reap the benefits of this type of workholding.