Assessing The Safety Of Magnetic Workholding

Izvor: KiWi

Trenutačna izmjena od 05:54, 10. ožujka 2014.

Resistance for the implementation of magnetic work holding normally starts with a concern for safety. These issues can be allayed by assessing the technology, holding power and optimal operating situations of magnetic work holding in terms of operational security.

Despite the competitive metal working benefits of magnetic workholding in reducing costs and improving productivity, there nevertheless exists a resistance to the implementation of magnetic technologies because the primary perform holder in machining operations. This resistance generally starts using a concern for security. By assessing the technologies, holding energy and optimal operating conditions of magnetic perform holding relative to operational safety, these concerns is often allayed.

Magnetic Operate Holding as a Safe Technologies

If a machine operator has held workpieces with mechanical clamps for decades, the idea of relying on magnetism to hold workpieces, in particular in heavy milling operations, boils down to an issue of trust: Is this really protected? Whilst understandable this opinion is rooted in subjectivity not objective reality. Greater than most likely, those that hold this point of view may not totally understand the facts of how protected magnetic operate holding is.

So, how can magnetic perform holding be considered as a safe technologies? By definition, it produces a uniform, consistent, and infinite holding power that doesn't loosen up, give, or lower till an operator de-energizes it.

Normally, magnetic work 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 energy named flux. When a workpiece is placed across the poles of those magnets, flux flows into it. When placed in this flux field, a magnetic field of opposite polarity is induced in to the workpiece thereby building a magnetic attraction involving the chuck plus the workpiece. This attraction will stay constant, uniform, infinite, and trustworthy as long as the magnetic field is energized. This reliability tends to make magnetic workholding a genuinely secure technology.

Magnetic Work Holding as a Protected Holding Force

Holding power or strength is a different element thought of when forming an opinion concerning the safety of magnetic workholding. If an operator does not know how robust magnetic workholding is, he might mistakenly believe magnetic technology just isn't strong adequate to perform the job safely. This opinion is usually allayed by two details:

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

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

Optimal Operating Conditions

To implement magnetic operate holding solutions could require some education to understand the technology's optimal operating circumstances. For example, magnetic perform holding is greatest utilised with smooth-surfaced workpieces as opposed to rough ones since the smoothness decreases the air gap among the workpiece along with the magnet; modest air gaps boost magnetic attraction along with the holding bond. Some supplies are much better conductors of magnetism than other people. By way of example, annealed supplies are ideal when hardened materials don't absorb flux as conveniently and will retain some magnetism. This situation may be corrected inside seconds with demagnetization. Ultimately, the direction in the holding force is however yet another adjustment an operator might have to make to safely implement magnetic perform holding. All magnets have 100 percent clamping force directly away from the face on the magnet, but only about 20 % clamping force against side forces. So, the geometry of a cut have to be viewed as in the machining process to reap the advantages of this kind of workholding.