Assessing The Safety Of Magnetic Workholding

Izvor: KiWi

Inačica od 03:57, 10. ožujka 2014.

Resistance for the implementation of magnetic operate holding generally begins with a concern for security. These concerns could be allayed by assessing the technology, holding power and optimal operating circumstances of magnetic function holding in terms of operational safety.

In spite of the competitive CNC Workholding Fixtures rewards of magnetic workholding in decreasing expenses and enhancing productivity, there nevertheless exists a resistance towards the implementation of magnetic technology because the primary operate holder in machining operations. This resistance usually begins using a concern for safety. By assessing the technology, holding energy and optimal operating conditions of magnetic work holding relative to operational security, these concerns is usually allayed.

Magnetic Work Holding as a Secure 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 really secure? Whilst understandable this opinion is rooted in subjectivity not objective fact. Greater than most likely, individuals who hold this point of view might not totally comprehend the facts of how protected magnetic function holding is.

So, how can magnetic perform holding be regarded as as a safe technologies? By definition, it produces a uniform, constant, and infinite holding power that does not relax, give, or reduce till an operator de-energizes it.

Generally, magnetic work holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Every single magnet includes 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 within this flux field, a magnetic field of opposite polarity is induced into the workpiece thereby building a magnetic attraction amongst the chuck and 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 actually secure technology.

Magnetic Perform Holding as a Protected Holding Force

Holding energy or strength is an additional factor thought of when forming an opinion concerning the safety of magnetic workholding. If an operator does not know how strong magnetic workholding is, he may perhaps mistakenly believe magnetic technology will not be robust sufficient to perform the job safely. This opinion can be allayed by two facts:

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

(two) based upon the application, an instantaneous clamping force of 12 tons per square foot might be generated by magnetic workholders. This degree of holding force is greater than comparable to mechanical clamps with 1 more benefit: magnetic holding force is uniform, continual and infinite until the operator de-energizes it.

Optimal Operating Circumstances

To implement magnetic function holding options may possibly call for some training to understand the technology's optimal operating conditions. As an example, magnetic work holding is finest utilised with smooth-surfaced workpieces as an alternative to rough ones since the smoothness decreases the air gap between the workpiece plus the magnet; compact air gaps raise magnetic attraction along with the holding bond. Some materials are much better conductors of magnetism than other individuals. For example, annealed supplies are excellent when hardened materials never absorb flux as quickly and will retain some magnetism. This condition might be corrected inside seconds with demagnetization. Lastly, the path of the holding force is however a different adjustment an operator may have to make to safely implement magnetic perform holding. All magnets have 100 % clamping force directly away from the face on the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a cut must be regarded inside the machining course of action to reap the benefits of this kind of workholding.