Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Resistance to the implementation of magnetic function holding ordinarily starts with a concern for security. These concerns is often allayed by assessing the technologies, holding power and optimal operating circumstances of magnetic work holding with regards to operational security.

In spite of the competitive Workholding advantages of magnetic workholding in minimizing costs and improving productivity, there still exists a resistance for the implementation of magnetic technology as the major perform holder in machining operations. This resistance normally begins having a concern for security. By assessing the technologies, holding energy and optimal operating situations of magnetic perform holding relative to operational safety, these concerns may be allayed.

Magnetic Function Holding as a Secure Technology

If a machine operator has held workpieces with mechanical clamps for decades, the idea of relying on magnetism to hold workpieces, specially in heavy milling operations, boils down to a problem of trust: Is this truly protected? Although understandable this opinion is rooted in subjectivity not objective truth. More than most likely, individuals who hold this point of view may not completely comprehend the information of how protected magnetic work holding is.

So, how can magnetic work holding be deemed as a safe technologies? By definition, it produces a uniform, constant, and infinite holding energy that will not relax, give, or decrease until an operator de-energizes it.

In general, magnetic work holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Each and every magnet has a north and south pole across which flows magnetic energy 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 creating a magnetic attraction among the chuck as well as the workpiece. This attraction will remain constant, uniform, infinite, and reliable provided that the magnetic field is energized. This reliability makes magnetic workholding a actually protected technologies.

Magnetic Operate Holding as a Secure Holding Force

Holding power or strength is an additional issue regarded as when forming an opinion in regards to the security of magnetic workholding. If an operator does not understand how strong magnetic workholding is, he could mistakenly think magnetic technology is just not strong adequate to accomplish the job safely. This opinion is usually allayed by two facts:

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

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

Optimal Operating Situations

To implement magnetic perform holding options may possibly demand some training to understand the technology's optimal operating conditions. As an example, magnetic function holding is very best used with smooth-surfaced workpieces in lieu of rough ones mainly because the smoothness decreases the air gap between the workpiece plus the magnet; modest air gaps improve magnetic attraction and the holding bond. Some materials are better conductors of magnetism than other individuals. By way of example, annealed materials are excellent while hardened components don't absorb flux as easily and can retain some magnetism. This condition may be corrected inside seconds with demagnetization. Lastly, the path with the holding force is but an additional adjustment an operator may have to make to safely implement magnetic perform holding. All magnets have 100 percent clamping force straight away in the face on the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a reduce have to be regarded as within the machining method to reap the advantages of this sort of workholding.