Assessing The Security Of Magnetic Workholding

Izvor: KiWi

Inačica od 04:03, 10. ožujka 2014.

Resistance for the implementation of magnetic operate holding ordinarily starts with a concern for security. These issues can be allayed by assessing the technologies, holding power and optimal operating conditions of magnetic operate holding with regards to operational safety.

Despite the competitive Workholding Fixtures positive aspects of magnetic workholding in reducing expenses and improving productivity, there nevertheless exists a resistance towards the implementation of magnetic technology because the key work holder in machining operations. This resistance usually begins with a concern for safety. By assessing the technologies, holding power and optimal operating conditions of magnetic operate holding relative to operational safety, these issues is often allayed.

Magnetic Function Holding as a Safe Technology

If a machine operator has held workpieces with mechanical clamps for decades, the idea of relying on magnetism to hold workpieces, specifically in heavy milling operations, boils down to a problem of trust: Is this actually secure? Even though understandable this opinion is rooted in subjectivity not objective fact. Greater than likely, those that hold this point of view might not fully have an understanding of the details of how safe magnetic operate holding is.

So, how can magnetic function holding be deemed as a protected 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.

Generally, magnetic function holders are constructed with an array of individual magnets embedded into a magnetic chuck or plate. Each magnet features a north and south pole across which flows magnetic energy known as flux. When a workpiece is placed across the poles of these magnets, flux flows into it. When placed in this flux field, a magnetic field of opposite polarity is induced into the workpiece thereby creating a magnetic attraction involving the chuck and the workpiece. This attraction will remain consistent, uniform, infinite, and reliable provided that the magnetic field is energized. This reliability makes magnetic workholding a definitely protected technology.

Magnetic Perform Holding as a Secure Holding Force

Holding energy or strength is one more issue deemed when forming an opinion about the safety of magnetic workholding. If an operator will not understand how robust magnetic workholding is, he could mistakenly believe magnetic technology will not be robust enough to do the job safely. This opinion could be allayed by two details:

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

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

Optimal Operating Circumstances

To implement magnetic operate holding solutions may possibly call for some instruction to understand the technology's optimal operating circumstances. By way of example, magnetic work holding is ideal applied with smooth-surfaced workpieces as opposed to rough ones since the smoothness decreases the air gap between the workpiece as well as the magnet; smaller air gaps increase magnetic attraction along with the holding bond. Some supplies are greater conductors of magnetism than others. As an example, annealed materials are perfect whilst hardened supplies don't absorb flux as very easily and can retain some magnetism. This condition can be corrected within seconds with demagnetization. Ultimately, the direction on the holding force is yet a further adjustment an operator might have to produce to safely implement magnetic perform holding. All magnets have 100 % 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 cut must be regarded within the machining method to reap the positive aspects of this sort of workholding.