What should I pay attention to when winding a metal drum with a 4 roll plate roller?
In the rolling, care should be taken to adjust the position of the side rollers. First, the one end is rolled, and then the other end is rolled, so that the roll can be rolled into a circular shape, that is, the cylinder can be formed.
Is the 3 roller bending machine straight down or the arc down?
The answer to this question is that the arc is down, but the price is relatively high.
What measures can be used to solve the problem of deflection of the plate bending machine?
In the plate bending machine, the part where the workpiece is plastically processed, that is, the core part of the process of completing the workpiece rolling, etc., is mainly the upper work roll, so this part is important, which is related to the finished product. quality. However, on the other hand, when the workpiece is subjected to a large force, it will be deflected, which will make the pressure distribution become uneven. If it is not processed in time, it will affect the quality of the finished product and even make the product Defective products appear. Therefore, from this point of view, reducing deflection is also an important aspect of ensuring product quality.
So what can we do?
We can take measures:
Measure one: The upper work roll is designed into a waist drum shape, that is, its diameter is the largest in the middle, and then gradually decreases toward both ends. In this case, you can put it in a straight state. However, it has some difficulty in calculation and manufacturing.
Measure 2: Adding support for the upper work roll is to add a support beam and a backup roll, and the height of the support roll can be adjusted.
The side roller of the 4 roll plate roller does not move. What is the reason?
If the side roller of the 4 roll plate rolling machine does not move, then it is possible to first check whether there is a problem with the hydraulic control portion corresponding to the movement of the side roller. If there is no problem, then check the side roller bearing housing and the side roller guiding groove, mainly to see if there is interference, basically these two aspects will have problems.
What is the straight plate edge coefficient of the plate bending machine?
The straight plate edge coefficient of the plate bending machine, in simple terms, refers to the reference value of the straight edge size reserved for the coiling machine when it is wound, which is mainly found in the 3-roller plate bending machine. The reason is mainly Because this type of plate bending machine does not have a pre-bending function, this coefficient exists.
What does “rolling” mean?
Rolling is when you start the bending-operation 4″ or 5″ from the edge of the plate, or possibly longer, depending of the geometry of the machine.
What does “pre-bending” mean?
When a part is rolled out to the edge (typically 1.5 to 2 times the material thickness), you are pre-bending it. This requires more energy from the machine, so your pre-bending- capacity is about 80% of the rolling capacity.
What do the terms yield and tensile strength have to do with rolling, braking or shearing?
Tensile Strengthis applied when you are talking about braking or shearing a piece of metal. Because all of the force you apply is over one specific spot on the plate you have to overcome the Tensile Strength to complete the job.Yield Strengthis applied when you are rolling a piece of metal. You are asking a little of every moment of movement.This is why when shearing or braking stainless steel or any other alloy where the tensile runs above 80,000 it requires a larger brake or shear to do the same thickness of plate while when rolling stainless steel, the size of the machine is very nearly the same. Example: 304 S.S. for instance has a tensile strength of 95,000 however the yeild is 35,000 making it about the same as mild steel.
Why are material designations so important?
Because material designations give you the details of the metal designated; such as yield strength and tensile strength.It is also important to make sure you have the entire designation ie: A516 is not enough information. You must also put the grade down; for instance A516-55 says the Tensile is 55-75,000 an the minimum yield is 30,000 while A516-70 says the tensile is 70-90,000 and the minimum yield is 38,000.
What is the standard chrome thickness of the upper roller on the plate rolling machine?
The thickness of chrome, which is generally expressed by how many wires, and the specificity of it depends on the thickness of the coil. For thin sheets, it is generally around 5 filaments.
The distance between the rollers of the coiler becomes larger, so what is the change in the radius of the coil?
When the distance between the rollers of the coiler becomes large, the radius of the coil is increased.
The distance between the rollers of the coiler becomes larger, so what is the change in the radius of the plate rolling machines?
When the distance between the rollers of the plate rolling machine becomes large, the radius of the coil is increased.
The three-roller bending machine theoretically has an axial force when the upper roller is rolled straight.
In theory, the three-roll bending machine does not have axial force when the upper roller is rolled straight, but in practice, if the cone is rolled, there may be axial force.
What are the roll material of the coiler?
Roller roller material, which can be 42CrMo or 45 gauge steel.
Knowing the thickness of the plate, how do you get the roll diameter?
In the three-roll bending machine, if the plate thickness is known, the three formulas are:
Lower roll center distance = (12-40) * plate thickness
Upper roll diameter = (1/1.3 – 1 / 1.1) * lower roll center distance
Lower roll diameter = (0.8 – 0.9) * upper roll diameter
Can the conical tube be formed at one time on a common three-roll bending machine?
This is basically impossible, and it is generally necessary to correct the arc first.
With a three-roller coiler cone cone, how big can the taper?
With a three-roller coiler cone, the taper will generally not exceed 30 degrees.
Plate Bending Mchine
What is the arrangement provided for balancing of top roll when swing arm is opened?
Top roll is counter balanced automatically once the drop end is opened without any jacks or manual arrangement.
What is done to compensate for deflection of rolls during pre-bending and rolling?
All three rolls are crowned (cambering) for compensating deflection.
Is there any method to know the position of bottom rolls?
DRO (Digital Readout) is housed on the operating console which gives the position of the bottom rolls with respect to the top roll.
What is the capacity for cone bending?
Cones can be bent up to the edge-bending capacity of the machine. The bottom rolls can be inclined for the required cone angle.
What is the level of protection for electrical components?
Some of the electrical bough outs are IP 55 like motors, switchgears etc. The electrical cabinet will be manufactured as per our standard practices and will meet IP 55 protection.
Is the main drive reversible?
Forward and reverse to the main drive is provided. The bottom rolls can be moved up and down individually.
What is the type of oil required?
Hydraulic oil – Enklo 68 Planetary Gear box – EP 90
Where are the main machine controls?
Operating console houses push buttons for all the operations of the machine. The console is movable so that the operator can keep it at any desired location.
Can we bend hot plates on the machine to get higher thickness capacity?
Although the standard machine is not meant for hot rolling, occasional hot rolling can be done (a few jobs per month) provided that suitable precautions are taken.
What is done to compensate for deflection of rolls during pre-bending and rolling?
Some plates have high yield point. The machines are rated for 26 kg/mm2. How to find the equivalent thickness?A. Divide the Actual YP by 26. Find square root of this number. Multiply this value by actual plate thickness to get effective thickness.
What are the precautions for Steel Plate Rolling and Bending of Higher Strength Steels??
There are two main considerations when rolling and bending high-strength steel sheets:
1. Machine tonnage / capacity
2. The rebound of the material after releasing the pressure
The tonnage is linearly proportional to the yield strength. Therefore, if the yield strength is doubled, the tonnage required for bending will also increase. Most bending and rolling mills use a “standard” grade of mild steel A36 or 1018 with a yield strength of approximately 36,000 psi.
You will have to look at the MTR (Material Test Report) of the manufacturer to verify the actual characteristics of the metal to be bent.
The rebound of material is a more complicated formula, but usually:
1. The higher the yield strength, the more the material rebounds.
2. The larger the forming radius, the larger the rebound angle