China Agro Processing Equipment Part Pellet Mill Ring Die

Agro Processing Equipment Part Pellet Mill Ring Die
Brief Introduction Of Ring Die
Ring die is the key part of Ring Die Pellet Mill in the large scale pellet plant to produce animal feed, wood pellets, poultry feed,livestock feed,aqua feed, bio-mass pellet and other granules.
The quality of ring die plays an important role in making high quality pellets and high output,also can save much maintenance cost for pellet manufacturers.
LiangYou is a reliable ring die manufacturer who can supply you top quality ring dies .We can customized design for various brand of pellet mill, such as: CPM, Matador ,Muyang, Paladin, Promill, Buhler, Zhengchang, Mabrik, Matador, Sogem, Andritz Sprout, Yemmak, etc.We can also make as per customers' drawing.

Main Features

1,Hole smooth,long working life and high output2,Competitive price3,Quick delivery4,about 20years of production experience5,Quality control:ISO9001:20006,Hole Diameter:Feed size 2-12mm; wood pellet size 6-12mm or other sizes customized7,Wear resistance,corrosion resistance,heat resistance,fatigue resistance,impact resistance.

Application:

Ring die for pellet machine in poultry feed,livestock feed,aqua feed, bio-mass pellet machine,etc.
Feature of our ring die

1.Made of imported high carbon high chromium stainless billet steel,optimization carbon,
thus enhancing wearing and corrosion resistance and hardness.

2. It can deal with all kinds of die hole over &1.2mm (&1.2mm included) and compression
ratio.

3.Ring die can be produced up to 300mm-1500mm in diameter and 500mm in height.

4.In ring die processing, full automatic control, one-time molding for die hole, high smoothness.

Production Process

1.Material refining technology,fewer impurities,high purity,largely reducing harmful elements
content(such as elements S,P ), thus comprehensive mechanical performance of material is
raised.

2.Through roll forging, material is processed and strengthened and material fibre is complete and uniform, which increases integrated mechanical performance of material.

3.FDSP Company has the world advanced forging equipment and technology,electronic data processing systems and perfect quality control system.

4.Ring die blank,generally chromiumalloy roll forgings, some factories use 45 ordinary
carbon steel.

5.Hardness of blank must be controlled, ranging from HB170 to HB220.If the hardness is too high,the drill is easy to break and happens with die hole when drilling. If hardness is too low,
the surface finish of die hole will be not good.

6.In order to control blank inner material uniformity, every blank must be carried out with fault detection, which can avoid defects such as flaw, pore-free,crackle and inclusions etc.

7.After machining and heat treatment process, hardness of ring die can be up to HRC 52-58(inner diameter less than 350mm),HRC50-56(inner diameter more than 350mm),more wearable and anti-corrosion.

8.In order to control hardness uniformity of ring die after heat treatment, we choose more than three points in each part of trisection of peripheral direction to test hardness and take average.The difference of hardness value between each part should not be higher than HRC4.

9.According to the principle of metal material science combined with gas quenching and C,Cr,Mn,Ni,V elements content is optimized, forming the standard of ring die.

Relation between die hole structure and pelleting

Straight hole and release stepped hole is suitable for compound feed processing

External conical hole suitable for the processing of high-fibre feed like de-fat chaff

Internal conical hole and compression type stepped hole applicable for the process of
herbage powder feed of light proportion. We should try to avoid using release stepped hole
(pressure relief vent). Because discharing is not easy for holes in the rows of the edge of ring die, pressure-relief vent is designed there.

Production process:

1.Precision Machining
CNC machining center

CNC machining center assure high dimensional accuracy,geometric tolerance and surface
roughness.

2.Hole Machining
Germany gun drill. Good quality gun drill equipment, tools and drilling hole software:

1.Die hole position high accuracy, up to 15 seconds per circle. High accuracy of position
ensures both high dimensional accuracy and uniformity of materials and uniformity in die
wearing and forces of radial direction and peripheral direction.

2.High rotating speed and imported tools and cooling liquid ensures process conditions as
drilling required.Thanks to such conditions, the processed die hole features small roughness, Ra 0.8 and smoothness, which can ensure pelleting output, quality and debugging
convenience.

3.The application of drilling hole software is favorable to increase porosity of ring die and
optimize its way of aperture and therefore pelleting output, quality and service life of die is
guaranteed.

Ring die pellet mill working principle
The basic structure of the pelletizing chamber is mainly composed of these parts: the die, the rollers, feeding scraper and cutting knives.

When the machine is started, the electric motor will drive the ring die to rotate. And the rollers will also revolve on its own axis due to the friction between itself and the die. By means of gravity and the centrifugal force generated by rotating of the ring die, material will be firmly attached to inner surface of the ring die. The feeding scraper will ensure the material to be continuously and evenly pushed forward along the die to be prepared for pelletizing.
Then the material is squeezed by the roller and the die, and with the gradually increasing pressure, the density of the material also becomes higher. Thus the material temperature will rise, which softens the lignin in it and makes it easier to be shaped. At this time, the material is compressed into the die holes and shaped into small cylindrical strips with diameters of 2 - 12 mm (depending on the size of the holes).


Die Materials
1. Alloy dies
This is the choice for many feed processors because of their good abrasion and breakage resistance.
2. Carbon steel die
They have superior corrosion resistance, making them the choice for processing operations involving corrosive chemicals.
3. Stainless steel dies
They have the best abrasion and breakage resistance as well as good corrosion resistance.

Process Of Ring Die
1,Precision Machining
CNC machining center :assure high dimensional accuracy,geometric tolerance and surface roughness.

2,Hole Machining
Our company's die is made by international advanced German gun drill, tools and drilling hole software.Which ensures process conditions as drilling required, therefore high pelleting output, quality and debugging convenience

3,Vacuum Hardening
American vacuum furnace:High vacuum degree, no oxidation reaction in ring die surface, ensuring original smoothness of die hole inner surface ,has long service life and high quality. High cooling speed ensures more even distribution of carbide hardenability and uniformity of ring die.

Relation between die hole structure and pelleting
1,Straight hole and release stepped hole
It is suitable for compound feed processing
2,External conical hole
It is suitable for the processing of high-fibre feed like de-fat chaff
3,Internal conical hole and compression-type stepped hole
This applicable for the process of herbage powder feed of light proportion

We should try to avoid using release stepped hole(pressure-relief vent)
Because discharing is not easy for holes in the rows of the edge of ring die, pressure-relief vent is designed there.

We need to maintain and check the pellet mill's spare parts: ring dies, roller assembly,roller shell, gear shaft,screws, bearings, coupling etc. Because they are take up about 8% of the machine cost every year (primary for such as wood chipper, hammer mill and pellet mill.)