Assessing The Safety Of Magnetic Workholding

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Resistance to the implementation of magnetic function holding normally starts with a concern for security. These concerns might be allayed by assessing the technology, holding power and optimal operating conditions of magnetic function holding in terms of operational safety.

Despite the competitive CNC Workholding Fixtures advantages of magnetic workholding in minimizing charges and enhancing productivity, there nevertheless exists a resistance for the implementation of magnetic technologies because the principal work holder in machining operations. This resistance ordinarily starts using a concern for safety. By assessing the technology, holding energy and optimal operating circumstances of magnetic operate holding relative to operational security, 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 concept of relying on magnetism to hold workpieces, in particular in heavy milling operations, boils down to a problem of trust: Is this definitely protected? Though understandable this opinion is rooted in subjectivity not objective fact. Greater than most likely, people that hold this point of view might not fully fully grasp the information of how protected magnetic function holding is.

So, how can magnetic operate holding be viewed as as a safe technology? By definition, it produces a uniform, consistent, and infinite holding energy that will not unwind, give, or decrease until an operator de-energizes it.

Generally, magnetic function holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Every single magnet has 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 in this flux field, a magnetic field of opposite polarity is induced in to the workpiece thereby creating a magnetic attraction amongst the chuck plus the workpiece. This attraction will stay constant, uniform, infinite, and reliable so long as the magnetic field is energized. This reliability makes magnetic workholding a truly safe technologies.

Magnetic Perform Holding as a Secure Holding Force

Holding power or strength is an additional issue thought of when forming an opinion about the safety of magnetic workholding. If an operator doesn't know how sturdy magnetic workholding is, he could mistakenly think magnetic technologies will not be strong enough to complete the job safely. This opinion could be allayed by two information:

(1) magnetic workholding can possess a clamping power up to 1000 daN and

(two) 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 greater than comparable to mechanical clamps with one further advantage: magnetic holding force is uniform, continuous and infinite until the operator de-energizes it.

Optimal Operating Circumstances

To implement magnetic work holding options might require some coaching to know the technology's optimal operating circumstances. As an example, magnetic perform holding is best utilized with smooth-surfaced workpieces rather than rough ones for the reason that the smoothness decreases the air gap involving the workpiece and the magnet; tiny air gaps increase magnetic attraction and the holding bond. Some components are far better conductors of magnetism than others. By way of example, annealed materials are excellent even though hardened materials never absorb flux as very easily and will retain some magnetism. This condition might be corrected inside seconds with demagnetization. Finally, the path of the holding force is yet an additional adjustment an operator might have to create to safely implement magnetic function holding. All magnets have 100 % clamping force directly away from the face with the magnet, but only about 20 % clamping force against side forces. So, the geometry of a cut have to be considered within the machining method to reap the benefits of this kind of workholding.