Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 02:21, 10. ožujka 2014.

Resistance to the implementation of magnetic function holding commonly begins with a concern for security. These issues is usually allayed by assessing the technology, holding power and optimal operating situations of magnetic function holding when it comes to operational safety.

Regardless of the competitive Workholding advantages of magnetic workholding in decreasing expenses and enhancing productivity, there still exists a resistance to the implementation of magnetic technology because the primary function holder in machining operations. This resistance generally begins using a concern for security. By assessing the technology, holding energy and optimal operating situations of magnetic function holding relative to operational security, these issues is usually 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, specifically in heavy milling operations, boils down to a problem of trust: Is this definitely secure? Even though understandable this opinion is rooted in subjectivity not objective fact. More than probably, those who hold this point of view may not fully understand the facts of how safe magnetic perform holding is.

So, how can magnetic operate holding be considered as a protected technology? By definition, it produces a uniform, constant, and infinite holding power that doesn't relax, give, or decrease till 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. Every magnet has a north and south pole across which flows magnetic power referred to as 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 between the chuck along with the workpiece. This attraction will stay consistent, uniform, infinite, and reputable so long as the magnetic field is energized. This reliability tends to make magnetic workholding a definitely safe technology.

Magnetic Function Holding as a Protected Holding Force

Holding power or strength is an additional issue regarded as when forming an opinion regarding the security of magnetic workholding. If an operator doesn't know how powerful magnetic workholding is, he may well mistakenly think magnetic technologies is not sturdy sufficient to complete the job safely. This opinion could be allayed by two details:

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

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

Optimal Operating Circumstances

To implement magnetic operate holding solutions might need some coaching to know the technology's optimal operating conditions. By way of example, magnetic operate holding is greatest utilised with smooth-surfaced workpieces as opposed to rough ones mainly because the smoothness decreases the air gap amongst the workpiece plus the magnet; small air gaps raise magnetic attraction and also the holding bond. Some materials are far better conductors of magnetism than other folks. One example is, annealed supplies are perfect while hardened supplies never absorb flux as easily and can retain some magnetism. This condition might be corrected inside seconds with demagnetization. Ultimately, the path of your holding force is however one more adjustment an operator might have to produce to safely implement magnetic work holding. All magnets have one hundred percent clamping force straight away from the face of your magnet, but only about 20 percent clamping force against side forces. So, the geometry of a cut should be considered inside the machining method to reap the advantages of this kind of workholding.