The process involves three principle elements: a fixture, the machine, and the abrasive.

Abrasive Flow Grinding, also known as Abrasive Flow Machining (AFM) , is a precision finishing technology used in a variety of industries. Some applications of this process include:
Deburring
Edge radius generation
Surface improvement (polishing)
Removal of thermal recast layers
Polishing complex internal shapes to mirror finishes
Create/improve the gas/liquid flow path inside valves and fittings


Why Use Abrasive Flow Machining?
Abrasive Flow Machining was developed in the 1960's, as a method of smoothing and polishing internal surfaces, and producing controlled radii. Hand polishing or deburring can result in inconsistent or inefficient results, and can be impossible to perform on complicated or internal surfaces.
The process can also optimize the flow coefficient or improve the high and low cycle fatigue strength of certain pieces.

 Process
Abrasive Flow Machining works by the back and forth flow under pressure of an abrasive laden, viscoelastic compound or abrasive media, through a holding fixture and over the area to be polished, deburred and radiused. In a typical, two-way flow process, two vertically opposed cylinders extrude the abrasive media back and forth through passages formed by the workpiece and tooling. In a one-way system, the abrasive media flows in only one direction, allowing the media to exit the part for fast processing, easy cleaning, or simple, quick-exchange tooling.
The process involves three principle elements: a fixture, the machine, and the abrasive.
 In particular, the mirror polishing is carried out in the guide pipe of the gas special body, which makes the grinding trace consistent with the fluid direction, effectively improves the performance, quality and service life of the grinding tool or workpiece, and makes the finish reach the mirror grade.
Abrasive fluid polishing machine is suitable for surface polishing, deburr, chamfer and other related surface polishing processes. Widely used with various molds, precision parts and related processes to improve quality, enhance productivity and reduce labor costs has achieved remarkable results.
Fixtures
The holding fixture is designed to increase the velocity of the abrasive compound in the area to be processed. The increase in velocity concentrates the material removal to specific areas of the work piece. Fixtures can be made from inexpensive, structural-grade nylon that provides a more adequate strength-to-weight ratio, and can be easily machined to custom configurations. High production fixtures are made from steel or aluminum and use polyurethane coated inserts to protect the workpiece from abrasive scratching or grooving. Depending on part size and machine size fixtures can hold from 1 to 50
A flow grinding machine serves several functions. First, it must be able to pump the abrasive media at either a specified pressure (PSI/MPa) or flow rate (cubic inches per second/liters per minute). Second, it must be able to clamp and seal the fixture between the upper and lower media cylinders, in a two-way flow system. Both of these functions are usually accomplished by hydraulic cylinders.The abrasive media is pumped from the pre-loaded lower media cylinder, by advancing the lower media piston, and then flows through the clamped fixture and finally up into the upper media cylinder. When the lower media piston is fully advanced, the flow is reversed; the upper media piston advances, returning the media through the fixture and back into the lower cylinder. This flow cycle represents one sequence, and is repeated until the preset total media displacement value (cubic inches/liters) has been achieved.
Most production AFM machines also include a media chiller to remove heat generated by the grinding action, and a fixture transport device, such as a shuttle or rotary table, to index fixtures from a load/unload station, to the processing position between the media cylinders. An automatic media reservoir can be used to pre-fill fixtures having large internal volumes with abrasive media, and ensure that there is enough media for the machine to always run at it's full displacement piston stroke (to avoid "short cycling").
Abrasive Media System
The abrasive media used in Abrasive Flow Grinding provides the actual material removal: polishing, deburring and edge radiusing. The media base, is a viscoelastic semi-solid, which can range in viscosity from a firm putty-like material to a soft, almost grease like consistency. At kooyle Flow Grinding we custom make this material for our customers particular grinding needs.

the thermal deburring process is a thermal chemical reaction process. The under deburring parts are placed in a sealed chamber, and then filled with a certain amount of methane gas or gas and oxygen mixed gas. After ignited spark, the mixture reacts instantaneously and releases a lot of heat, which makes the burr heated under the action of 20 times high speed and eight times of high pressure at high temperature of about 3000 C. And to achieve the purpose of deburring. Because the reaction time is very short, only 0.003 seconds, the original size, surface finish, metallographic structure and mechanical properties of the parts after heated are basically unchanged.
Because of the high accessibility and pervasive of gas, it has a unique removal effect to the burr, such as the inner hole cross hole blind hole and other parts with complex shape or difficult to remove the burr by hands. The equipment has small volume, high efficiency, a cycle period of 90 seconds, good deburr effect, and can meet a large quantity of production demand and widely used in mechanical, hydraulic, pneumatic die casting, automotive aviation
The introduction of polymer elastic soft abrasive material is based on the different hardness of the material and the choice of abrasive material.
Silicon carbide Mohs hardness 9.5 2840-3320kg/m micro hardness, color green or ink.
With high quality green silicon carbide, high hardness, chemical stability certain toughness, the main raw material infiltrated into other materials and mixed, its hardness is between corundum and diamond, at 1000 degree of high temperature still can maintain the inherent hardness and strength, and a lot of non-metallic (glass ceramics) and some non metal (zinc, steel and alloy). The material does not react with chemicals. It is suitable for processing glass, ceramic, stone, cast iron and some non-metal, cemented carbide, high speed steel, etc.

The company has rich experience and strong technical research and development team, developed by overseas professional engineers, university professors and their own industry experts, and is responsible for production by its own engineers, and has a perfect quality monitoring system.
Heat energy deburring machine,
High Polymer elastic soft abrasive material 
Bi-directional abrasive flow polishing machine
Unidirectional abrasive flow polishing machine 
Micro hole abrasive flow polishing machine
Non standard customization Equipment
Boron carbide  Mohs hardness 9.36 micro hardness 4315-5296kg/m, grey black.
The special polymer solid boron carbide abrasive materials are mixed with other materials, and the thickness of the ink is based on the roughness required by the material of the workpiece. The abrasive has a very sharp cutting and self sharpness, with many non-metallic (glass ceramics) and some non metal (zinc, steel and its alloy). The material does not react with chemicals. It is suitable for processing glass, ceramics, stone, cast iron, and some non-metallic, cemented carbide, high speed steel, etc.

Diamond powder abrasive  Mohs hardness 10 micro hardness 10000kg/m, yellow.
 this product uses special high density molecular elastic solid soft abrasives, with flexibility and flexibility, good mechanical properties, high hardness and high strength. It is suitable for metal materials - tool steel, high speed steel, high school and low carbon steel alloy steel, aluminum, copper, tin iron, etc. The surface of the workpiece, such as the graphite magnet bitumen of ceramic stone, is treated with the inner cavity wall Micro Polishing mirror, and the workpiece is evenly and slightly consumed inside and outside the workpiece, without residual abrasive and long life, it can control the polishing treatment of the mirror surface.