Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 04:41, 10. ožujka 2014.

Resistance for the implementation of magnetic work holding normally starts with a concern for safety. These concerns might be allayed by assessing the technologies, holding power and optimal operating circumstances of magnetic operate holding in terms of operational safety.

Despite the competitive CNC Workholding Fixtures added benefits of magnetic workholding in decreasing charges and improving productivity, there still exists a resistance for the implementation of magnetic technologies because the key function holder in machining operations. This resistance usually begins with a concern for security. By assessing the technology, holding power and optimal operating situations of magnetic operate holding relative to operational security, these concerns could be allayed.

Magnetic Function 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 an issue of trust: Is this genuinely secure? Whilst understandable this opinion is rooted in subjectivity not objective truth. Greater than probably, individuals who hold this point of view might not totally have an understanding of the information of how protected magnetic operate holding is.

So, how can magnetic perform holding be thought of as a protected technologies? By definition, it produces a uniform, consistent, and infinite holding power that doesn't unwind, give, or decrease till an operator de-energizes it.

Normally, magnetic operate holders are constructed with an array of person magnets embedded into a magnetic chuck or plate. Every magnet has a north and south pole across which flows magnetic power named 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 in to the workpiece thereby generating a magnetic attraction among the chuck plus the workpiece. This attraction will remain consistent, uniform, infinite, and trusted provided that the magnetic field is energized. This reliability tends to make magnetic workholding a truly secure technology.

Magnetic Function Holding as a Safe Holding Force

Holding power or strength is another aspect deemed when forming an opinion concerning the security of magnetic workholding. If an operator does not know how robust magnetic workholding is, he may mistakenly believe magnetic technology is not robust adequate to perform the job safely. This opinion could be allayed by two information:

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

(2) 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 added benefit: magnetic holding force is uniform, continual and infinite till the operator de-energizes it.

Optimal Operating Circumstances

To implement magnetic perform holding solutions may demand some training to understand the technology's optimal operating situations. As an example, magnetic function holding is most effective utilized with smooth-surfaced workpieces as an alternative to rough ones simply because the smoothness decreases the air gap involving the workpiece and the magnet; little air gaps improve magnetic attraction plus the holding bond. Some materials are far better conductors of magnetism than other people. For example, annealed components are perfect though hardened supplies never absorb flux as simply and can retain some magnetism. This condition could be corrected within seconds with demagnetization. Ultimately, the direction on the holding force is however another adjustment an operator might have to make to safely implement magnetic work holding. All magnets have 100 % clamping force straight away in the face in the magnet, but only about 20 percent clamping force against side forces. So, the geometry of a reduce have to be regarded within the machining procedure to reap the positive aspects of this kind of workholding.