Press Brake Machine Manufacturer
Hydraulic Press Brake
Capacity range of 20T to 3000T, Highly Functional Electric & Hydraulic Press Brakes
The term "brake" as used in modern sheet metal fabrication, comes from the Middle English verb breken, or break, which meant to bend, change direction, or deflect.
What is Press Brake?
Press Brake (aka Bending Machine, Hydraulic Press Brake, Hydraulic Bending Machine) is a machine that can bend thin plates. The press brake can meet the needs of various workpieces by changing the mold.
The Hydraulic Press Brake includes a bracket, a worktable, and a clamping plate. The worktable is placed on the bracket. The worktable is composed of a base and a pressure plate. The base is connected to the clamping plate by a hinge. The base is composed of a seat shell, a coil, and a cover plate. The coil is placed in the recess of the seat shell, and the top of the recess is covered with a cover plate.
When in use, the coil is energized by the wire, and after the electricity is energized, the pressure plate is gravitationalized, so as to realize the clamping of the thin plate between the pressure plate and the base. Due to the use of electromagnetic force clamping, the pressing plate can be made into various workpiece requirements, and the workpiece with side walls can be processed.
Hydraulic Press Brake Types
The press brake is divided into the manual press brake, hydraulic press brake, and CNC press brake. A manual press brake is divided into a mechanical manual press brake and an electric manual bending machine. Hydraulic press brakes can be divided into torsion shaft synchronization, machine-hydraulic synchronization, and electro-hydraulic synchronization according to the synchronization method. Hydraulic press brakes can be divided into the up-moving type and the down-moving type according to the movement mode.
Hydraulic Press Brake Structure
The structure of the Hydraulic Press Brake (hydraulic bending machine) is mainly composed of left and right columns, workbenches, and beams. The left and right oil cylinders are fixed on the columns. , The upper die is installed at the lower end of the slider, the hydraulic system provides power, and the electrical system gives instructions. Under the action of the oil cylinder, the slider drives the upper die downward and the lower die closes to realize the bending of the sheet.
The left and right uprights, the worktable, and the slider (hereinafter referred to as the three major parts) are the key parts of the bending machine. The sum of the weight of the three major parts accounts for 70% to 80% of the total weight of a Hydraulic Press Brake (hydraulic bending machine). Its strength and rigidity directly determine the running accuracy, service life, and workpiece accuracy of the hydraulic press brake.
Top 4 Parts of Press Brake
- Slider part: hydraulic transmission is adopted, and the slider part is composed of a slider, an oil cylinder, and a mechanical stopper fine-tuning structure. The left and right oil cylinders are fixed on the frame, and the piston (rod) drives the slider to move up and down through hydraulic pressure, and the mechanical stop is controlled by the numerical control system to adjust the value;
- Worktable part: operated by the button box, the motor drives the material stopper to move forward and backward, and the distance of movement is controlled by the numerical control system, and the minimum reading is 0.01 mm (there are limit switches at the front and rear positions);
- Synchronization system: a mechanical synchronization mechanism composed of a torsion shaft, swing arm, joint bearing, etc., with a simple structure, stable and reliable performance, and high synchronization accuracy. The mechanical stop is adjusted by the motor, and the numerical control system controls the value;
- Material stopper mechanism: The material stopper is driven by a motor, and the two screw rods move synchronously through chain operation, and the numerical control system controls the stopper size.
The 6 structural Characteristics of Hydraulic Press Brake
- The hydraulic press brake(bending machine) adopts an all-steel welded structure with sufficient strength and rigidity;
- Hydraulic upper transmission, the oil cylinders at both ends of the machine tool are placed on the slider to directly drive the sliding work;
- The slider synchronization mechanism adopts torsion shaft forced synchronization;
- Adopt a mechanical stop structure, stable and reliable;
- The slider stroke is motorized and quickly adjusted, and manually fine-tuned, and the counter is displayed;
- Wedge-type deflection compensation mechanism to ensure high bending accuracy.
The Top 3 Selection Notes for a Press Brake?
Selection Note 1#: Back Gauge
- This is an adjustable gauge that stops the part by centering the bending line on the V-shaped opening of the die.
- It allows the part to be bent to be in the right position.
- The angle control
- It is used to compensate for any inaccuracies in the press brake.
- Warning: the angle control is limited on some parts (if they are too small, parts with negative angles, etc.).
Selection Note 2#: Tools
- Using hydraulic clamping allows for shorter tool change times, for example.
- The clamping length also has an effect on the tool’s accuracy.
- Be sure to respect the maximum press force to avoid damage to the tools.
Selection Note 3#: Operator Safety
- When changing tools, make sure to stop the press brake motor or turn it to a minimum.
- Operators should never put their hands on the tool work surface.
- They must also not wear loose or flowing clothing.
- Lastly, operators must not work at the back of the machine.
6 Tips for picking out the best punch and die
Tip 1#: Understand the Bending Basic
Understand the differences between air bending, bottom bending, and coining, and know when to use each. Air bending—which involves leaving an air gap between the material and the bottom of the V die—is the standard process, but there will be cases where the material needs to touch the bottom of the die, either lightly (bottom bending) or heavily (coining).
Tip 2#: Air-bending Tonnage Chart
Make the air-bending tonnage chart your best friend. If your brake doesn’t come with a chart mounted to it, find one on the web to print out and tape on your machine. Knowing just the material thickness and the desired inside bend radius, you will be able to calculate from the chart the necessary V die opening, the minimum bendable flange length, and the tonnage per foot of material to make the bend.
Tip 3#: Apply the Rule of Eight
If you don’t know what the inside bend radius will be, a guideline is to select a V opening that is six to ten times the thickness of the material to be bent, so about eight times on average (which is the formula used on most bending charts). When a match can’t be found, round up to the next closest die and you’ll be close to what you need and can experiment from there.
Don’t try to pick out a punch until you’ve determined a die that has the proper V opening for the job.
Tip 4#: Maximum Tonnage Capacity
Pay attention to the maximum tonnage capacity of the die in question. For short flanges, the correct V opening might require more tonnage than a specific die can handle.
Select a punch with a tip that has a radius that’s about half of the thickness of the material if you are bending mild steel or stainless. For soft aluminum, the radius of the tip may have to be identical to the inside radius of the bend.
Tip 5#: Spring Back
Know how to compensate for spring back in the material being bent. For example, because of the greater tensile strength of stainless steel, overbending by one or two degrees is usually necessary to allow for spring back to return the material to the desired angle. For a 90° bend, using an 88° punch is usually recommended for bending stainless.
Tip 6#: Tools
Learn the different styles of punches and what they are used for, such as acute punches, which are used for bending very small angles, and gooseneck punches with their large, concave shape, which is used in making channels and U-profiles where a flange would otherwise impact the side of a standard punch.