Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 04:08, 10. ožujka 2014.

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

In spite of the competitive magnetic workholding benefits of magnetic workholding in minimizing expenses and enhancing productivity, there still exists a resistance to the implementation of magnetic technologies as the key work holder in machining operations. This resistance normally begins using a concern for safety. By assessing the technologies, holding energy and optimal operating situations of magnetic perform holding relative to operational safety, these concerns is usually 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, specially in heavy milling operations, boils down to an issue of trust: Is this definitely safe? When understandable this opinion is rooted in subjectivity not objective fact. More than likely, people that hold this point of view may not completely recognize the information of how secure magnetic function holding is.

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

Normally, magnetic operate 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 called 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 producing a magnetic attraction amongst the chuck and also the workpiece. This attraction will remain constant, uniform, infinite, and reputable as long as the magnetic field is energized. This reliability makes magnetic workholding a really safe technologies.

Magnetic Function Holding as a Secure Holding Force

Holding power or strength is one more element regarded when forming an opinion about the safety of magnetic workholding. If an operator will not know how robust magnetic workholding is, he may well mistakenly believe magnetic technologies just isn't strong enough to do the job safely. This opinion is often allayed by two facts:

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

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

Optimal Operating Conditions

To implement magnetic operate holding solutions may perhaps call for some training to know the technology's optimal operating situations. One example is, magnetic function holding is finest utilised with smooth-surfaced workpieces as opposed to rough ones because the smoothness decreases the air gap in between the workpiece plus the magnet; compact air gaps boost magnetic attraction as well as the holding bond. Some supplies are superior conductors of magnetism than others. One example is, annealed components are perfect when hardened supplies never absorb flux as quickly and will retain some magnetism. This situation could be corrected within seconds with demagnetization. Ultimately, the direction with the holding force is however yet another adjustment an operator may have to create to safely implement magnetic operate holding. All magnets have 100 percent clamping force directly away in the face with the magnet, but only about 20 % clamping force against side forces. So, the geometry of a cut must be considered in the machining method to reap the advantages of this kind of workholding.