Product Details

Rolling mill performance:

Screw flight is screw conveyor’s main part. Screw conveyor is mainly composed of screw flight, transmission shaft, conveying tube and etc. It is widely used in agricultural, grain, food, chemical, medical, and mine and other fields. Screw flight plays a role of conveying, mixing, pushing, grinding and etc.

Screw flight cold rolling mill is advanced equipment and uses steel strip continuous rolling screw flight. It can roll out the needed the screw flight of various specifications only by the simple regulation (not changing the parts).

Screw flight cold rolling and forming method craft is advanced and has high efficiency, saving raw material, high quality flight, high hardness, good abrasive resistance and etc.

Our company can produce screw flight cold rolling mill and transfer screw flight cold rolling mill technology models are large-scale, medium and large scale, small and medium scale, small scale and deformed products.

One pair tapered rollers laminate when rolling and the steel strip cross-section will be changed. Then, there will be formed screw flight of thinly out edge and thickly inner edge trapezoidal cross-section. The steel strip width change is small when laminating and when the steel strip thickness becomes thin, then there will be a little reducing trend the thicker steel strip’s width will be increased after rolling. But as for less than 4 mm steel strip, these changes are very small. Besides, the smaller flight’s screw pitch and inner diameter, the larger outer diameter should be known. That is the larger of the inner small flight’s width, the larger of the steel strip’s twist and the harder of the rolling and forming.

Then there are the requirements when flight adopts continuous rolling. The ratio of the inner diameter and outer diameter is as large as possible and the ratio can’t less than 0.2. Namely inner diameter can’t less than outer diameter’s 1/5. Flight’s screw pitch is less than outer diameter’s 2/3 greater than outer diameter’s 3/2. So it is difficult to roll and form and this limit should be avoided. There are many factors influence rolling and forming actually. The rolling and forming factors are steel strip’s material, thickness, the size of the roller offset, feeding height, roller laminating pressure, guiding wheel, roller’s temperature and etc. How to rapid regulate the above factors and roll out the qualified flight that we needed. So, the experience should be accumulated continually during the rolling process and it can regulate rapidly and handle skillfully after accumulating the abundant experience.

Security noting items:

The below items should be noted except the general security noting items:

1. The fence should be set up after the rolling mill, so that it can prevent the accident for closing to the transmitting parts.

2. The unqualified steel strip and rough surface and iron stained material aren’t allowed to use.

3. The steel strip isn’t allowed exceed the top the roller.

4. There aren’t steel strip between the two rollers and the two rollers contract with each other. Moving the roller isn’t allowed.

5. The stopping time should not be exceeded 2 hours, when there is steel strip between two rollers.

6. The roller holder must be fastened when rolling. (The M48 bolts should be tightened.)

7. The clutch should be separated firstly when stopping (The knob should be turned off.) Then other buttons of motor should be turned off.

8. The deformed steel strip end head getting into the roller again should be prevented and it needs special notice

9. The rubber ring covered on the roller should be checked at least one time one week and the yellow glycerin should be filled up in the inner groove.

10. Security should be noted including human and machine’s security during operation.

I. the identification of front, back, left and right in the specification.

People stand in the operation position and face to the machine.

People’s left orientation is the left and the right orientation is the right.

Closed to the people’s side is the front.

Far away from people’s orientation is the back. View the picture one.

II. The performance of the rolling mill

The maximum thickness of the rolling steel strip: 5mm

The maximum width of the rolling steel strip: 100mm

The minimum diameter of the rolling flight: ¢24mm

The maximum outer diameter of the rolling flight: ¢600mm

All kinds of screw flight specification can be rolled in the above statement size scope. But it is difficult to be rolled when the flight’s inner size is less than 1/5 outer diameter or the screw pitch is less than 2/3 outer diameter and greater than 3/2 outer diameter.

III. Steel strip technical requirements:

The character of the steel strip should be average. They are also should be average of chemical composition, hardness, tensile strength, thickness and size. Besides, there aren’t corroding and other defects when the cold rolling or hot rolling comes through pickling then oil painted slightly.

1. Chemical composition:

Composition C Mn S p

Content% 0.08 <0.05 <0.05 <0.05

2. The tensile strength of the steel strip: Less than 28--32Kg/mm2

3. The hardness of the steel strip

Thickness 3 3-3.5 3.5-4.5 4.5-5

Hardness HB 120-140 105-125 ≤80 the lower, the better

As the steel strip’s thickness increases, the hardness is required to reduce; we can see when the thickness of the steel strip is less than 4.5mm. It is the lower hardness and the easier rolling.

It is generally used for making the steel coil which conforms to the above condition cut into steel strip coil. The width of the cutting steel strip should be accurate. Besides, the edge should be deburred. The large burr can damage the roller and the rolled flight can form sharp zigzag-shape edge which can influence the flight quality.

The thickness of rolling the steel strip: 5mm

The maximum width of the rolling steel strip: 100mm