Tumbling-Media

Tumbling Barrels Provide The Needed Finish

Deburring machines are better known as finishing machines. Their purpose is to finish parts – by facilitating polishing, cleaning, separating and deburring actions. There are two important types of mass finishing deburring machines – tumbling barrel machines and the vibratory machines. In all the deburring machines, the parts are loaded along with finishing deburring media, finishing compounds and/ or water. Deburring media include ceramic media and plastic media that are man made and corn cob media and walnut shell media that are natural. Finishing compounds come as wet or dry compounds. Their composition varies depending on the abrasive action that is needed, inhibition action (like anti corrosion, anti rust) and the suspension properties needed. The compounds help to suspend the debris that comes out during the finishing process in deburring machines. This prevents the debris from getting deposited or lodged back into the parts.

Vibratory deburring machines involve a tub or a bowl that is shaken at high speeds which causes the parts and the finishing media to scrape against each other in a filing kind of motion. In a vibratory machine, the sliding action happens on all of the load with a single vibration; there fore cycle times are very less compared to tumbling barrels. They are high speed, short stroke machines and hence are good for delicate parts as well as large surfaces. They are very useful as separators of parts. The loading and unloading of vibratory machines is very simple. There are also other types of deburring machines like centrifugal machines, blasting machines and spinning machines that are used in special cases. In the blasting deburring machines, some media are blasted on to parts to deburr them.

In a tumbling machine, tumbling barrels are present to hold the parts and the finishing media and compounds. They are available as floor (large) and bench (small) models. The parts and the finishing media are lifted from the barrel’s corners by the movement of the machine and they bump and slide against each other. The media that is used in barrel tumbling depends on the roughness of the finishing that is required, the nature of the parts being tumbled and whether polishing or deburring is the prime requirement.

In barrel tumbling, parts can be used without using any media too in special cases. Usually, barrel tumbling is used for wet processing but in some cases where there is a need, dry finishing can also be done using them. Wet barrel finishing is intended for processing metals. They can be used for removing burrs, polishing and improving surface appearance. A dry barrel system gives a finish that is smoother and more uniform than a wet finishing barrel. In factories where there is not much water, dry barrelling is the ideal option. Tumbling barrels are ideal for heavy loads; they function optimally when they are 50 % loaded. Screen doors can be added to barrels for use in separating parts. For more details on the different kinds of deburring machines available from finishing industry experts, go to http://gravcollc.com/

Good Finish For Parts With Deburring Machines And Media

Deburring is the process of removing jagged edges or protrusions from parts, mostly wooden and metal parts. Deburring machines are used to accomplish the process of deburring. Primarily two types of deburring machines are used – tumbling or barrel machines and vibratory machines. Tumblers are used for mass finishing of parts. They can be used for wet as well as dry finishing. These systems are well suited for fast and efficient deburring of plastic and metal parts or components. There are models that are available in different sizes from compact bench models to big barrels that can be fixed on floors. Tumbling systems are very important deburring systems in use. They are typically used where heavy deburring is required. Barrels are ideal for heavy loads. Dry tumbling is used when delicate deburring is called for and produces a smooth finish. Wet barrelling is used for metal processing to remove excess material as well as to provide a polish.

Vibratory deburring machines are also used for mass finishing. They function by shaking or vibrating the processing vessel, which causes the finishing media and parts to scrape against each other thus accomplishing a deburr and producing a polish. These deburing machines are precise and can deburr even recesses in the parts and hence they are very well adapted for delicate and intricate components. They can also be used on large surfaces because they have very short strokes and high speeds. These machines can be automated quite easily compared to tumblers.

Blasting machines are another type of deburring machines in which media is blasted on to parts under high pressure thus creating a finishing action. Blasting machines are used to deburr hard to reach parts and also to clean parts of dust, grime, rust etc. There are also other deburring machines like gyra machines, centrifugal disks and spin finishing machines for specialized usage.

Finishing media are used in finishing systems to aid in the deburring process. Ceramic media is ideal for use with hard metals that need heavy cutting action. They are generally used for polishing and deburring – light, heavy, fast or super fast deburring. For applications that need small sized media, ceramic media is highly recommended. They come in pre formed shapes to suit different purposes. Cones, stars, triangles, cylinders etc are some of the shapes in ceramic media. These shapes ensure easy separation of parts and deburring of hard to reach areas. Ceramic media are long lasting and inexpensive. As they can be used for multiple requirements, they are the most commonly used in the mass finishing industry.

Ceramic media are made as a combination of silica, minerals and abrasive materials and are manufactured at very high temperatures thus producing hard ceramic media which are then cut to the desired length. The rougher deburring applications call for a ceramic media that has more density. By using more abrasive in the manufacturing, high density can be achieved. But high density means faster wear and tear; so they are used only rarely. Go to http://gravcollc.com/ for more information on deburring machines and media.