Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 03:19, 10. ožujka 2014.

Resistance to the implementation of magnetic operate holding generally begins having a concern for security. These issues is often allayed by assessing the technologies, holding power and optimal operating situations of magnetic work holding in terms of operational security.

Regardless of the competitive more info rewards of magnetic workholding in reducing expenses and improving productivity, there still exists a resistance for the implementation of magnetic technology as the primary work holder in machining operations. This resistance usually begins with a concern for security. By assessing the technology, holding power and optimal operating situations of magnetic work holding relative to operational safety, these issues might be allayed.

Magnetic Perform 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, specially in heavy milling operations, boils down to an issue of trust: Is this seriously safe? Though understandable this opinion is rooted in subjectivity not objective truth. Greater than probably, those that hold this point of view may not fully recognize the details of how safe magnetic work holding is.

So, how can magnetic perform holding be thought of as a secure technologies? By definition, it produces a uniform, constant, and infinite holding energy that doesn't unwind, give, or lower until an operator de-energizes it.

Generally, magnetic perform holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Each magnet has a north and south pole across which flows magnetic power known as 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 into the workpiece thereby creating a magnetic attraction between the chuck and the workpiece. This attraction will remain constant, uniform, infinite, and trustworthy provided that the magnetic field is energized. This reliability makes magnetic workholding a really protected technology.

Magnetic Operate Holding as a Secure Holding Force

Holding power or strength is a further element deemed when forming an opinion about the safety of magnetic workholding. If an operator does not understand how powerful magnetic workholding is, he could mistakenly believe magnetic technologies is not powerful adequate to complete the job safely. This opinion is usually allayed by two information:

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

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

Optimal Operating Conditions

To implement magnetic function holding options may well need some instruction to understand the technology's optimal operating conditions. For instance, magnetic perform holding is best made use of with smooth-surfaced workpieces as an alternative to rough ones mainly because the smoothness decreases the air gap among the workpiece along with the magnet; little air gaps raise magnetic attraction and also the holding bond. Some components are improved conductors of magnetism than other folks. By way of example, annealed components are ideal whilst hardened components do not absorb flux as effortlessly and will retain some magnetism. This condition is usually corrected inside seconds with demagnetization. Finally, the path on the holding force is however an additional adjustment an operator might have to produce to safely implement magnetic perform holding. All magnets have one hundred percent clamping force straight away from the face of the magnet, but only about 20 % clamping force against side forces. So, the geometry of a reduce have to be viewed as in the machining procedure to reap the benefits of this sort of workholding.