Overview
The working (rolling) system of the profile bending machine consists of two guide rolls and one top, active bending roll. The position of the active bending roll can be adjusted using a rotating handle/arm. In the case of the MSM-50 model, this handle is used for adjusting the upper roll position, while the MSH-50 model is equipped with a hydraulic system/hand pump for the same purpose.
All three rolls are driven by a motor reducer. Additionally, it is possible to disconnect the upper bending roll from the drive by changing the position of the lever on the side of the machine.
The movement of the rolls is initiated by pressing and holding one of the two foot pedal switches on the foot-operation controller. Each foot pedal switch corresponds to a direction of roll rotation (clockwise or counterclockwise).
To protect the body, which is fastened to the base frame, against damage, adjustable guide rollers are employed. These rollers can be adjusted by means of nuts located in the rear part of the body.
The body is secured to the frame using two pins rotating in sleeves. The working position of the profile bending machine can be changed to a horizontal position by pulling the securing pin, rotating the body by an angle of 90° with the motor reducer facing downwards, and pushing back the pin into the body.
Finally, the profile bending machine is equipped with two emergency stop buttons. One button is located near the electrical cabinet, while the other is positioned on the foot controller.
Overall Structural Design of MS 50 Angle Roller
Because the three-roller Angle roll machine uses a mechanical three-roller symmetry structure, the two lower rollers perform the main movement of the rotation, and the upper roller performs the vertical elevating movement, so the design uses the “handle-drive screw-drive nut-slider” The transmission method converts the rotation of the handle into the vertical lifting movement of the upper roller so as to achieve the purpose of pressing the angle.
In the rolling process of the steel plate, the control of the curvature is achieved by adjusting the rolling amount of the upper roller, and the pressing amount can be arbitrarily adjusted by the ruler to achieve curling of the radius of curvature within a certain range.
The pressure of the upper roller adopts the screw driving mode of “the nut is fixed, the screw rotates and moves”, and the upper roller shaft and the screw are kept relatively stationary through the slider so as to achieve the purpose of synchronously lifting the upper roller shaft and the screw.
Design of Roll Shaft
Angle roller the upper roller axle is an important part of the machine, bearing the combined force of the two rollers. The design should satisfy reasonable structure, sufficient strength, and good craftsmanship.
Angle Roller Axis Material And Structure Determination
The material of the shaft is mainly carbon steel and alloy steel.
The carbon steel has high enough strength and low sensitivity to stress concentration, which facilitates various heat treatment and mechanical processing. The price is low, the supply is sufficient, and the application is the most widely used.
Alloy steels have higher mechanical properties and are often used to make high-speed, heavy-duty shafts or require large, lightweight shafts. By performing various heat treatments, chemical treatments, and surface strengthening treatments, the strength and wear resistance of a shaft made of carbon steel or alloy steel can be improved. Especially for alloy steels, the superior mechanical properties can only be fully demonstrated after heat treatment.
As MSM-50 profile bending machine requires the shaft to have high strength and the shaft diameter can not be too large, we choose alloy steel, its brand name is 38CrMoAlA, forging shape and quenching treatment, hair bad diameter 60mm, hardness 293~321HBS, tensile strength Limit = 930 MPa, yield limit = 785 MPa, bending fatigue limit = 440 MPa, shear fatigue limit = 280 MPa allowable bending stress = 75 MPa.
Bend Shaft
According to the working conditions of the axis of the Angle roll machine and the material of the shaft, the primary shaft diameter is 35mm. Because the shaft mainly bears the radial load, the type of the bearing installed between the upper roller and the shaft is cylindrical roller bearing.
According to the “Mechanical Design Handbook,” Higher Education Version, known cylindrical roller bearings (taken from GB283-87) found d = 40mm, D = 80mm, B = 23mm, model number 32508.
Since the width of the upper roller is 42mm, a type 32208 cylindrical roller bearing should be installed in the upper roller, d = 40mm, D = 80mm, B = 18mm, and then sealed with a sealing ring.
Since the length of the shaft in the slider is 18 mm, the distance from the slider to the bearing is 34 mm, the width of the copper sleeve is 20 mm, and the width of the upper roller is 42 mm, so the working length of the shaft is:
L=20+42+18+34=114(mm)
Positioning And Fixing Of Shaft Parts
In order to prevent axial movement of the Angle roll machine shaft and parts during operation and to ensure their exact working position, all parts mounted on the shaft must be accurately positioned and securely fastened. In order to limit the axial movement of the shaft, the shaft and the slider are threaded to ensure that the shaft and the slider are relatively stationary. The shaft shoulder positions the bearing axially. The pressure plate and the copper sleeve axially position the upper roller and then double head bolts and nuts lock the pressure plate.
Workplace And Electrical Requirements
The section bending machine (MS Series) needs to be installed on a level and hardened surface to ensure its stability.
Electric
The electrical equipment/power supply must be connected via a 5 x 2.5 mm2 copper cable with a voltage of 3 x 400 V and protected by a fuse with delay characteristics (Type C fuse) and a load capacity of 20A.
Electrical equipment needs to be equipped with residual current devices. A 32A/5-pin power socket is required to connect the machine to the grid. Before connecting the profile bending machine to the grid, a qualified electrician needs to control the installation.
Space
The location of the profile bending machine should ensure easy access to all the components of the machine, and the processed parts can be safely and easily inserted into the profile bending machine.
The figure above shows the operator’s workspace. The workshop operating the profile bending machine needs to be equipped with sufficient lighting and ventilation equipment to provide an appropriate amount of fresh air.
The manufacturer is not responsible for any damage caused during the implementation and subsequent use of electrical connections that do not comply with applicable regulations!
Starting Methods
First Start
During the first start-up, the profile bending machine should run for about 2 minutes without rolling any material-the bending roller should be moved by the foot controller.
During this period, check whether the profile bending machine is running smoothly, without impact, and no friction or scratching sound is found. If the section bender vibrates excessively or the sound of rotating components rubbing on the fixed parts is clearly heard, you must immediately turn off the machine and unplug the power plug from the power socket.
If possible and approved, please check and eliminate the cause of the failure or contact the manufacturer.
Normal Start
Every time the machine is started, it should be started without placing any part between the rollers to check whether it is working properly.
After ensuring that the machine runs in accordance with the specifications given in the instruction manual and the direction corresponding to the foot pedal, you can start metal processing the machine
