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   barrel 가공(barrel finishing)


(a) centrifugal barrel finishing machine:

Centrifugal barrel equipment consists of a turret that rotates at high speeds. Mounted to the turret are two to four closed barrels containing the finishing mass. These barrels rotate at slower speeds than the turret and in the opposite direction. This complex motion creates high centrifugal forces and smooth media sliding action within the barrels. Process times are 20 to 40 times faster than for vibratory machines. Smaller media is used in this high-energy process, providing better access to all part surfaces for development of extremely fine finishes. The force applied by the media can be varied so that two operations can be combined into a single cycle - deburring and surface refining for example. Vessel capacities for this type of equipment range from 1.0 - 10 ft³.

Another high-energy process uses the centrifugal disk equipment. Newer than the other finishing machines, this design uses a rotating disk in the bottom of a cylindrical vessel that forces the mass out and up against the stationary vessel wall, where it slows down. The mass continues to slow down as it reaches the top of the vessel and then falls down the center toward the rotating disk to repeat the cycle. So, the media and parts move at varying speeds which generates desired surface finishes in cycle times between those of vibratory machines and centrifugal barrels. Parts can be inspected easily during the process because the vessel has an open top and the process is easily automated. The load can be emptied through an opening in the side of the container or the whole vessel can be tilted to dump the load. Media separation, washing, classification, and return can be accomplished using methods similar to those used with tub vibratory machines. Some units can perform with dry or wet media. Equipment capacities range from 0.5ft³ to 20ft³.

Centrifugal barrel machines are high energy machines, designed to rapidly process your parts, they are capable of producing a high polish finish on aluminum and stainless steel with the proper process.

(b) rotary barrel finishing machine:

The "elder statesman" of mass finishing equipment, the rotary barrel, still performs with excellence in many applications. However, it is slow, since it applies the lowest energy of all mass-finishing equipment. It is messy and therefore often confined to the dim, dark recesses of the plant. It requires an operator with much more skill and training than those who operate vibrators, and it is not normally recommended today except in unusual cases.

The newest mass-finishing machine has a round chamber with a rotating disc in the bottom. The disc rotates and forces the mass out and up against the stationary chamber wall, where it begins to slow down. The mass slows further as it reaches the top of the load, just before it descends back down the middle toward the spinning disc, where the cycle is repeated. The constantly varying speeds of media and parts generate excellent surface finishes in cycles intermediate between the vibratory machines and the centrifugal barrel.

(c) vibratory barrel finishing machine:

Driven by horizontal motor and by means of special deriving working tub along with the base spring to produce high frequency vibration to achieve requested efficiency processing. Due to the advantages of large inlet and extensive usefulness, it is the best machine for large and longer workpiece.

In vibratory finishing, energy in the form of vibratory forces is transformed by the machine's drive system into a mass of loose media and then into the parts. The entire load is in motion at the same time so that the media act against the parts throughout the complete mass.
Elements. Basic elements of the system include the machine, the media, and the compound and/or water solution. Selection of each depends primarily on the parts being run - that is, the type of parts: size, shape, and condition; and the work to be accomplished.
Primary functions of the media are to keep the parts separated during processing, to provide a cutting action for removing burrs or smoothing surfaces, and/or to brighten or clean the workpiece surfaces. The ratio of media to parts, by volume, determines the degree of parts separation; at high ratios, parts are well separated and have little contact. This is an important consideration when part finish is critical.
Role of compounds. Liquid compounds are used to keep parts and media clean, inhibit corrosion, lubricate, cut, cushion parts against damage, suspend tiny loose abrasive particles, and for such other specialized functions as foam control and to speed up drying. In many cases, the type of compound used and its degree of dilution with water determines the success or failure of the entire system.

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