Xinxiang Hexie Machinery Co.Ltd
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Ring Die And Pressure Roller

2019-06-22
1.Ring die
(1)Materials and processing
Ring dies are generally made of carburized steel, alloy steel and stainless steel. Some feed ingredients will precipitate free fatty acids under the action of heat and moisture, which will lead to corrosion of steel and corrosion without the use of stainless steel ring die. Regardless of material, the ring die bore increases progressively wear during use. Ring die processing first will be forged into rough steel, normalizing treatment in the window processing, and then processing die hole with a special drill, and then carburizing or vacuum quenching treatment.
(2)The aperture ratio of die hole
The ratio of the diameter of a die hole to the depth (length) of the die hole is called the aperture ratio. For ring die with a certain thickness, the larger of aperture, the smaller aperture ratio, the material in the die hole is easy to be extruded, but high productivity, this particle is loose. On the other hand, the larger of aperture ratio, the lower of productivity, the tenacity, the strength. In order to obtain better pelleting performance and keep the quantity and quality in the most reasonable state, different feed granules have different aperture ratio requirements.
2.Roller
Pressure rollers are used to squeeze materials. In order to increase the frictional force of the outer surface of the roller, different shapes are machined in the surface, such as : drilling , without the head of groove shape, the head of the groove shape or the surfacing of the wear-resistant alloy material. The number of rollers installed in the ring die is 1~3. Small ring die is one, medium ring die is two, and large ring die is two to three.
3.The clearance of ring die and pressure roller
The clearance between ring die and roller in pelleting process is extremely important. The clearance is adjustable. If the clearance is too small, exacerbate die and roller mechanical wear and tear. If the clearance is too large, it is easy to cause slip affecting yield and quality. For general materials, the clearance of ring die and roller should be 0.1 ~ 0.3 mm.
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