Assessing The Safety Of Magnetic Workholding

Izvor: KiWi

Resistance for the implementation of magnetic function holding commonly begins having a concern for safety. These concerns is usually allayed by assessing the technology, holding power and optimal operating conditions of magnetic operate holding in terms of operational safety.

Despite the competitive extra resources advantages of magnetic workholding in decreasing fees and improving productivity, there still exists a resistance to the implementation of magnetic technologies as the main perform holder in machining operations. This resistance typically begins having a concern for security. By assessing the technology, holding energy and optimal operating conditions of magnetic operate holding relative to operational security, these concerns is usually allayed.

Magnetic Operate Holding as a Safe Technology

If a machine operator has held workpieces with mechanical clamps for decades, the concept of relying on magnetism to hold workpieces, particularly in heavy milling operations, boils down to an issue of trust: Is this really safe? Even though understandable this opinion is rooted in subjectivity not objective reality. More than most likely, those that hold this point of view might not completely recognize the details of how protected magnetic perform holding is.

So, how can magnetic operate holding be regarded as a secure technology? By definition, it produces a uniform, constant, and infinite holding energy that will not loosen up, give, or lower until an operator de-energizes it.

In general, magnetic operate holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Every single magnet includes a north and south pole across which flows magnetic power 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 into the workpiece thereby making a magnetic attraction between the chuck along with the workpiece. This attraction will stay constant, uniform, infinite, and reputable so long as the magnetic field is energized. This reliability tends to make magnetic workholding a really secure technologies.

Magnetic Work Holding as a Protected Holding Force

Holding power or strength is a further aspect regarded when forming an opinion concerning the security of magnetic workholding. If an operator doesn't know how sturdy magnetic workholding is, he may well mistakenly believe magnetic technologies will not be strong enough to accomplish the job safely. This opinion may be allayed by two information:

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

(two) 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 particular further advantage: magnetic holding force is uniform, continuous and infinite till the operator de-energizes it.

Optimal Operating Situations

To implement magnetic function holding options could demand some training to understand the technology's optimal operating circumstances. For instance, magnetic operate holding is best utilized with smooth-surfaced workpieces as opposed to rough ones due to the fact the smoothness decreases the air gap among the workpiece plus the magnet; little air gaps enhance magnetic attraction and also the holding bond. Some components are superior conductors of magnetism than other people. For instance, annealed materials are best though hardened supplies never absorb flux as conveniently and will retain some magnetism. This situation could be corrected within seconds with demagnetization. Finally, the direction with the holding force is but another adjustment an operator may have to produce to safely implement magnetic function holding. All magnets have 100 percent clamping force straight away from the face in the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a reduce have to be deemed in the machining procedure to reap the positive aspects of this sort of workholding.