Activity :cut-off mode for roll forming machine
Mar 27, 2018
cut-off mode for roll forming machine
In actual use, the cut-off mode can be divided into three categories:1, Shutdown mode 2, the focus of piercing cut off mode 3, with the move off mode.
1. Shutdown mode
1 plate shutdown mode: Cut off mode, is the use of Rotary encoder through the length of the mechanism, contact with the plate, passive rotation to control the length of the section of the way work; When the encoder count reaches the low speed range, the molding host is controlled by the inverter to slow down, and then run to the set length, Stop the molding machine after the operation of a mode of cutting. Because of the on-line contact length, in addition to deceleration and contact friction, due to clamping force, speed difference and friction coefficient instability. The fixed-length precision is basically controlled in the ±2mm, and when the actual precision is more than ±2mm, the precision can be further improved by adding the running length of the low speed operation area appropriately. The forming main engine drive motor is generally asynchronous motor.
The positioning method in the thick plate forming, due to the deformation of the plate after the plastic deformation rebound, the scene will appear after the length of the back of the situation, the site needs to increase braking to ensure the accuracy of the shutdown.
2. Centralized punching and cutting off mode Some customers of the product plate type almost all of the hole distance and fixed length have tolerance limit, we use the front of the step-by-step punching and shearing has accumulated error, can not reach the requirements of the drawing, must be measured with a high resolution encoder, one step feeding, At the same time to complete all punching and cutting work. By adjusting the position of the mold and cutting position or direct processing to ensure that this method is simple and direct, high precision, the disadvantage is the equipment investment and mold cost high, the length of the production line is longer.Often used in the production of products with high accuracy requirements, conventional feeding is difficult to ensure precision.
3, with the move off mode
1 servo tracking cut off mode: Often used in molding faster, demanding high production efficiency of the production of products, such as stud track, cz purlin, high-speed guardrail and other products.
(1) Servo tracking fixed-length cutting mode: The forming host is running at a uniform speed, the cutter is waiting at the origin position, the servo motor according to the Rotary encoder installed in the forming machine, reading the velocity and position signal of the forming machine running, when the position signal arrives, the shearing frame starts, the servo motor drives the cutter to do the tracking mode, Start shearing when the servo speed is consistent with the work piece speed.
This model is related to the design precision of servo-tracking shears, when the machining precision of the frame in the servo-tracking shearing frame and the selection of the linear Guide and the ball screw are reasonable, the accuracy of the fixed-length ±1mm can be achieved and the repetition precision is 0.1 mm.
(2)Oblique Cutting mode: The machine is running at a uniform speed, through the sensor or rotary encoder to measure the cut-off position, cut off the signal to arrive, start the oblique cut with the moving cutter down, back to the cylinder degassing, plate through the cutting edge, driving the entire mold movement, execution cut off, cut complete, the return cylinder will mold back to the original point of position, Wait for the next cut. This model is suitable for the forming of a light shear weight, the profile has a certain intensity of the occasion.It is widely used in stud track roll forming machines.
