HARSLE takes you in-depth understanding of hydraulic bending machine

Regarding the bending machine, most customers only understand its basic usage and operation, and have little or no knowledge of its working principle and internal configuration. This article will explain in detail from the basic components of the bending machine to the high-end options, and take you to an in-depth understanding of the hydraulic bending machine.

Cylinder

For most bending machines, the oil cylinders are generally installed above the left and right sides of the bending machine. The oil cylinders are used to provide machine pressure. The pressure generated by the oil cylinders directly acts on the slider, and then acts on the bending workpiece through the slider. Generally, the bending length is less than 1200mm, you can consider using a single cylinder; some door manufacturers sometimes choose a three-cylinder bending machine.

There is a proportional valve on the top of the cylinder of the electro-hydraulic bending machine; there is no proportional valve on the top of the torsion shaft bending machine (this is a major difference between the torsion shaft bending machine and the electro-hydraulic bending machine), but the two cylinders pass through one The link rods are connected to achieve synchronization of the strokes of the two cylinders. Because the hydraulic cylinder of the electro-hydraulic bending machine and the torsion axis bending machine have different structures, the hydraulic cylinder of the electro-hydraulic bending machine runs faster than the torsion axis bending machine. The wearing parts of the cylinder are mainly the sealing ring. If there is oil leakage, you can consider replacing the sealing ring.

Slider

The slider is a part that is installed at the bottom of the cylinder and can move up and down. The two ends of the slider of the torsion-axis bending machine are synchronized by the torsion shaft, and the two ends of the slider of the electro-hydraulic bending machine are synchronized by the closed loop system formed by the grating rulers at both ends. Both ends of the sliding block are fixed on the guide rail, and linear movement up and down is realized by moving on the guide rail.

Clamp

Bending machine clamps are mainly divided into general clamps, quick clamps, platen clamps and hydraulic clamps. Common clamps are generally used for torsion axis bending machines, and quick clamps are generally used for torsion axis CNC bending machines and electro-hydraulic bending machines; consider When the mold is relatively large, the platen clamp is generally used for large-scale bending machines above 300T. The hydraulic clamp is generally used as an option, and the price is relatively expensive, but it is convenient and quick to use. Quick clips are generally divided into ordinary quick clips, double-sided quick clips (AMADA and TYOKKO), and one-button quick clips. The hydraulic clamp is generally selected from WILA brand. After the hydraulic clamp is selected, there are corresponding requirements for the upper mold, which requires a double notch and a spring button.

Hydraulic system

Crowning system

The crowning system is divided into manual crowning, electric crowning and hydraulic crowning. The bending machine with bending length less than 2500mm is not equipped with crowning system. Manual crowning is used for torsion axis bending machine, electric crowning and hydraulic crowning are used for electro-hydraulic bending machine. Electric crowning is divided into narrow type (with CNC lower mold, generally single V, 2V or 4V) and wide type (generally with multiple V lower mold).

Y axis control method

The torsion shaft bending machine drives the connecting rod to rotate through the AC motor (or servo motor) through the chain (synchronous belt), so as to realize the adjustment of the cylinder stroke. The cylinder stroke of the electro-hydraulic bending machine is controlled by the switch of the servo valve, and the Y-axis (cylinder stroke) value is displayed in the system by real-time feedback from the grating ruler. When the set position is about to be reached, the valve opening must be changed so that the slider is just right. Stop at the set position. Due to the difference in structure, the two cylinders of the torsion axis bending machine run up and down synchronously through the torsion axis, and all have only one Y axis; the two cylinders of the electro-hydraulic bending machine can operate independently, so there are two axes, Y1, Y2. 

The grating ruler is used to feed back the real-time position of the Y-axis, and it only appears on the electro-hydraulic bending machine. A grating ruler is installed on both sides of the electro-hydraulic bending machine. This is also the difference between torsion shaft bending machine and electro-hydraulic bending machine.

Two limit switches are installed on one side of the torsion shaft bending machine (usually the right side). When the slide moves downwards and hits the upper limit switch, the slide starts to slow down; when the slide moves upwards to the lower limit switch, the slide stops. The upper limit adjusts the work advance position, and the lower limit adjusts the upper dead center position.

Backgauge

The back gauge of torsion axis bending machine is generally X axis + standard manual R axis. The back gauge of the torsion shaft bending machine is controlled by a servo motor or an AC motor. The back gauge of electro-hydraulic bending machine is generally X, X+R, X+R+Z1+Z2, X1+X2+R1+R2+Z1+Z2. Each axis of the back gauge of the electro-hydraulic bending machine is controlled by a servo motor.

CNC system

The torsion axis bending machine system is generally E21, and the commonly used systems that can be angled are E300, TP10, DA-41S, CT8, etc. The electro-hydraulic bending machine system is mainly divided into three major brands; DELEM, ESA, Cybelec.

Optional configuration

Common parameters