Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Resistance for the implementation of magnetic operate holding generally begins using a concern for safety. These issues could be allayed by assessing the technology, holding power and optimal operating conditions of magnetic work holding in terms of operational security.

Despite the competitive link advantages of magnetic workholding in reducing costs and improving productivity, there still exists a resistance for the implementation of magnetic technologies because the main work holder in machining operations. This resistance commonly starts with a concern for security. By assessing the technology, holding power and optimal operating situations of magnetic perform holding relative to operational security, these concerns is usually allayed.

Magnetic Work Holding as a Safe Technologies

If a machine operator has held workpieces with mechanical clamps for decades, the concept of relying on magnetism to hold workpieces, in particular in heavy milling operations, boils down to a problem of trust: Is this actually protected? When understandable this opinion is rooted in subjectivity not objective reality. Greater than probably, people that hold this point of view may not fully fully grasp the information of how secure magnetic function holding is.

So, how can magnetic operate holding be viewed as as a safe technology? By definition, it produces a uniform, constant, and infinite holding energy that does not loosen up, give, or reduce until an operator de-energizes it.

In general, magnetic function holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Each magnet includes a north and south pole across which flows magnetic power known 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 building a magnetic attraction involving the chuck as well as the workpiece. This attraction will remain constant, uniform, infinite, and trustworthy so long as the magnetic field is energized. This reliability makes magnetic workholding a definitely safe technology.

Magnetic Operate Holding as a Protected Holding Force

Holding power or strength is yet another aspect considered when forming an opinion in regards to the security of magnetic workholding. If an operator will not know how powerful magnetic workholding is, he could mistakenly think magnetic technologies isn't strong enough to complete the job safely. This opinion may be allayed by two details:

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

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

Optimal Operating Situations

To implement magnetic work holding solutions may demand some instruction to understand the technology's optimal operating conditions. For example, magnetic function holding is greatest used with smooth-surfaced workpieces rather than rough ones due to the fact the smoothness decreases the air gap in between the workpiece and the magnet; small air gaps increase magnetic attraction and also the holding bond. Some materials are improved conductors of magnetism than others. For example, annealed materials are best although hardened components do not absorb flux as quickly and will retain some magnetism. This condition is usually corrected within seconds with demagnetization. Ultimately, the path on the holding force is yet a further adjustment an operator might have to produce to safely implement magnetic function holding. All magnets have one hundred percent clamping force straight away from the face on the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a cut has to be regarded within the machining method to reap the advantages of this type of workholding.