Press Brake Correct Choose And Buy

Press Brake Correct choose and buy

Correct selection and editing

The cost of production will rise when a folding machine is chosen, and the bending machine cannot expect to recoup its costs. Therefore, several factors must be weighed in the decision.


The first important thing to consider is the part you want to produce, the main point is to buy a machine that can complete the processing tasks with the shortest working table and the smallest tonnage.

Carefully consider the material number and maximum machining thickness and length. If the bulk of the work is a low carbon steel with a thickness of 16 gauge and a maximum length of 10 feet (3.048 meters), free bending shall not be greater than 50 tons. However, if a large number of bottom die forming, perhaps a 160-ton machine should be considered.

Assuming the thickest material is 1/4 inch, 10 feet free to bend requires 200 tons, and a bottom-concave die bending (corrected bending) requires at least 600 tons. If the bulk of the workpiece is 5 feet or less, the tonnage is nearly halved, thereby greatly reducing the acquisition cost. The length of the parts is very important to determine the specification of the new machine.

Flexible change

Under the same load, the 10-foot-machine table and slider appear to be four times as big as five feet. That is to say, shorter machines require fewer spacer adjustments to produce qualified parts. Reducing the pad adjustment reduces the preparation time.

Material number is also a key factor. Compared with low carbon steel, the load of stainless steel usually increases by about 50%, while the majority of soft aluminium is reduced by about 50%. You can always get a ton of machines from the bending machine manufacturer, which shows the amount of tons required for each foot length in different thicknesses and materials.

Bending radius

With free bending, the bending radius is 0.156 times the opening distance of the concave mold. In the free bending process, the concave opening distance should be eight times the thickness of the metal material. For example, the bending radius of the parts is about 0.078 inches when the opening distance of 1/2-inch (0.0127 meters) is formed by the 16-gauge low carbon steel. If the bending radius is almost as small as the thickness of the material,

A bottom-concave mould shall be formed. However, the pressure required to form a concave shape is about four times greater than that of free bending.

If the bending radius is less than the thickness of the material, it is required to use the convex model with the radius of the front end of the front end, which is less than the thickness of the material, and the bending method is turned on. In this case, you need 10 times the pressure of free bending.

In terms of free bending, convex die and concave die according to the 85 ° or less than 85 ° processing (smaller). Using this set of mold, punch and die in the gap at the bottom of the stroke, and compensate the springback and keep material around 90 ° of flexion.

Usually, free bending die on a new bending machine of springback Angle 2 ° or less, bending radius equal to the die opening distance of 0.156 times.

For a bottom bending die, die Angle generally is 86 ~ 86 °. At the bottom of the stroke, there should be a gap slightly greater than the thickness of the material. The forming Angle has been improved because the bending of the bottom concave modulus is larger (about 4 times that of free bending), and the stress of springback is usually caused by reducing the radius of the bending radius.

The bending of the embossing is the same as that of the bottom concave mold, but the front end of the convex mould becomes the required bending radius, and the gap between the concave die of the bottom end of the stroke is less than the thickness of the material. By applying enough pressure (about 10 times free bending) to force the front-end contact material, the rebound is largely avoided.

In order to choose the lowest tonnage specification, it is better to plan for bending radius greater than the thickness of the material, and adopt free bending method as far as possible. When the bending radius is larger, it often does not affect the quality of the parts and their future use.