Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Resistance for the implementation of magnetic operate holding usually begins having a concern for security. These concerns is usually allayed by assessing the technologies, holding energy and optimal operating conditions of magnetic work holding when it comes to operational safety.

Regardless of the competitive Workholding Fixtures rewards of magnetic workholding in decreasing charges and improving productivity, there nevertheless exists a resistance to the implementation of magnetic technology because the principal work holder in machining operations. This resistance commonly begins with a concern for safety. By assessing the technologies, holding energy and optimal operating situations of magnetic perform holding relative to operational safety, these concerns might be 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, particularly in heavy milling operations, boils down to a problem of trust: Is this really protected? Although understandable this opinion is rooted in subjectivity not objective truth. More than probably, individuals who hold this point of view may not completely realize the facts of how protected magnetic work holding is.

So, how can magnetic work holding be regarded as a safe technology? By definition, it produces a uniform, consistent, and infinite holding energy that doesn't loosen up, give, or lower till an operator de-energizes it.

Generally, magnetic operate holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Each and every magnet features 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 generating a magnetic attraction involving the chuck plus the workpiece. This attraction will remain consistent, uniform, infinite, and dependable 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 a further factor regarded when forming an opinion regarding the security of magnetic workholding. If an operator doesn't understand how sturdy magnetic workholding is, he might mistakenly believe magnetic technologies will not be robust enough to do the job safely. This opinion might be allayed by two details:

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

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

Optimal Operating Circumstances

To implement magnetic perform holding solutions may possibly call for some instruction to understand the technology's optimal operating situations. As an example, magnetic function holding is ideal applied with smooth-surfaced workpieces as an alternative to rough ones for the reason that the smoothness decreases the air gap among the workpiece and also the magnet; modest air gaps increase magnetic attraction and the holding bond. Some materials are superior conductors of magnetism than other folks. As an example, annealed supplies are best when hardened materials never absorb flux as effortlessly and can retain some magnetism. This situation is usually corrected inside seconds with demagnetization. Ultimately, the path from the holding force is but another adjustment an operator may have to produce to safely implement magnetic function holding. All magnets have one hundred % 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 must be thought of in the machining method to reap the positive aspects of this sort of workholding.