Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 03:30, 10. ožujka 2014.

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

Despite the competitive workholding solutions added benefits of magnetic workholding in reducing expenses and enhancing productivity, there nonetheless exists a resistance for the implementation of magnetic technologies because the principal perform holder in machining operations. This resistance normally begins with a concern for safety. By assessing the technologies, holding energy and optimal operating situations of magnetic work holding relative to operational security, these issues is usually allayed.

Magnetic Perform 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, especially in heavy milling operations, boils down to a problem of trust: Is this truly safe? Though understandable this opinion is rooted in subjectivity not objective fact. Greater than most likely, those who hold this point of view might not completely comprehend the information of how safe magnetic operate holding is.

So, how can magnetic perform holding be viewed as as a secure technologies? By definition, it produces a uniform, consistent, and infinite holding energy that doesn't relax, give, or decrease till an operator de-energizes it.

Normally, magnetic function holders are constructed with an array of individual 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 these magnets, flux flows into it. When placed within this flux field, a magnetic field of opposite polarity is induced into the workpiece thereby developing a magnetic attraction amongst the chuck along with the workpiece. This attraction will remain constant, uniform, infinite, and trustworthy as long as the magnetic field is energized. This reliability tends to make magnetic workholding a actually secure technology.

Magnetic Work Holding as a Safe Holding Force

Holding power or strength is an additional issue considered when forming an opinion regarding the safety of magnetic workholding. If an operator will not understand how robust magnetic workholding is, he may perhaps mistakenly think magnetic technologies isn't powerful enough to perform the job safely. This opinion might be allayed by two facts:

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

(two) 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 more than comparable to mechanical clamps with one particular additional benefit: magnetic holding force is uniform, continual and infinite until the operator de-energizes it.

Optimal Operating Situations

To implement magnetic perform holding options may well require some coaching to know the technology's optimal operating circumstances. For example, magnetic operate holding is finest employed with smooth-surfaced workpieces as opposed to rough ones simply because the smoothness decreases the air gap involving the workpiece and the magnet; small air gaps improve magnetic attraction along with the holding bond. Some supplies are greater conductors of magnetism than other individuals. As an example, annealed components are perfect while hardened components never absorb flux as simply and will retain some magnetism. This situation might be corrected inside seconds with demagnetization. Finally, the direction with the holding force is however one more adjustment an operator might have to create to safely implement magnetic work holding. All magnets have 100 percent clamping force straight away from the face of the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a reduce have to be regarded inside the machining process to reap the positive aspects of this type of workholding.