The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

YUAN HUI

YUAN HUI

LMM GROUP main products focus on the cold and hot plate & wide strip mill rolls and heavy section mill rolls and big casting & forging pieces.

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How is H-beam rolled? What is a “universal mill”?

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  • What is H-beam?

H-beam is optimized and developed from I-beam, and it is an economical section steel with better section mechanical properties. H-beam section shape is economical and reasonable, with good mechanical properties, and the section is named after the English letter “H”.

H-beams are divided into hot-rolled H-beams and welded H-beams

H-beam
  • H-beam rolling process

The rolling of strip steel is very easy to understand, and it is simply rolled with two upper and lower rolls.

H-beam is just like its name, like an H letter, how to roll such a complex shape of steel, this requires a special rolling technology, we call it pass rolling.

H-beam
  • How H-beam is rolled

1. Rough rolling

The billet is first rolled into an approximate H shape with a two-roller with a pass. The red part in the figure below is the cross-sectional shape of the billet after entering each corresponding pass position. The second and third holes from left to right are identical, and one of them is a spare hole during production.

H-beam
2. Universal Mill Finishing

The red picture on the far right of the above picture is close to H-beam, but there will still be a difference from the final order standard. In the follow-up, a universal rolling mill is required to produce qualified H-beams. The universal rolling mill is no longer two rolls up and down, but four up and down, left and right, and there is only one pass. Let us use a simplified diagram to see the rolling of the universal rolling mill. What is the system like.
H-beam
H-beam
  • H-beam rolling process

Process introduction:

H-beam

Is the universal mill universal? In fact, it is not. It means that the finishing rolling process of section steel can be applied to more sizes, but it is absolutely impossible to leave the production of section steel.

  • What is a universal rolling mill?
H-beam

The difference between the universal rolling mill and the ordinary rolling mill is that a pair of vertical rolls are added on the basis of the two rolls. The function of the vertical rolls is to control the size and shape of the left and right sides.

Without further ado, let’s take a look at the basic structure of the most advanced universal rolling mill in China with a simplified three-dimensional diagram.

H-beam

Note:

1. The green part of the figure is the bearing box of the flat roll and the vertical roll, and the blue part is the roll.

2. The vertical roller does not need to be driven, it is a passive roller. The horizontal roll, like the ordinary rolling mill, has a flat section on the right side, which we call the flat head, which forms a transmission cooperation with the shaft sleeve.

Structure of universal rolling mill

1.The structure of the universal rolling mill is different from that of the ordinary two-high rolling mill

With the addition of a pair of vertical rolls, the structure of the universal rolling mill is also different. Compared with the ordinary two-high rolling mill, there is a horizontal arch (frame) on the left and right of the universal rolling mill to carry the vertical roll pressure.

H-beam

2.The assembly of the universal rolling mill is more complicated than that of the ordinary two-high rolling mill

The connection of the arches on both sides requires the use of four long prestressed tensioning hydraulic cylinders. (Of course, there are also beams that are sleeved on the corresponding hydraulic cylinders. In order to clearly see the four hydraulic cylinders, we will omit them.)

H-beam

3. Side view of the universal mill

H-beam
  • How “universal” is the universal rolling mill?

What else can a universal rolling mill produce besides H-beams?

H-beam

These products have high precision requirements on the lateral dimension and the straightness of the flange. I really don’t know how to produce them without the universal rolling mill. Of course, there are many other products with strange shapes that we won’t go into details.

Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.

Always a pre-production sample before mass production;
Always final Inspection before shipment;
During the epidemic, provide remote detection technical support

Tell us a little about your application and we’ll get back to you to finalize a quotation to meet your needs as quickly as possible.

Rolling mill rolls product

Classification by roll material:

Cast iron mill rolls

  • Alloy indefinite chilled cast iron rolls
  • Alloy chilled cast iron rolls
  • Alloy SG ductile cast iron roll
  • Pearlitic ductile cast iron roll
  • Bainite ductile cast iron roll
  • Centrifugal cast iron roll


Cast steel mill rolls   

  • Alloy cast steel rolls
  • Semi-steel roller
  • Graphite steel rolls
  • High-chromium steel roll
  • High-speed steel roll


Forging mill rolls

Sort by position on the rolling mill:

Work rolls
backup rolls

Intermediate roll

Product advantage

The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

LMM high-speed steel rolls have higher steel passing per groove (times) due to their good wear resistance, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, and improve the overall efficiency of the factory.
Generally, the amount of steel passing in a single groove (times) is 3 to 5 times that of cast iron rolls.

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