Points to consider when purchase Hydraulic press brake bending machine

  • 2020-03-02 16:23:46

Hydraulic press brake bending machine

Hydraulic bender workpiece

The first important thing to consider is the parts you want to purchase hydraulic press brake. The point is to buy a machine that can complete the processing task with the shortest worktable and the smallest tonnage.

Carefully consider material grades as well as maximum working thickness and length. If most of the work is on 16 gauge mild steel with a maximum length of 10 feet, the free bending force need not be greater than 50 tons. However, if you are engaged in a large number of bottom die forming, perhaps a 150 ton machine tool should be considered. Assuming that the thickest material is 1/4 inch, the 10ft free bending requires 165 tons, and the bottom die bending (correcting bending) requires at least 600 tons. If most of the work pieces are 5 feet or less, the tonnage is almost halved, greatly reducing the cost of purchase.The length of the part is important to the specification of the bending machine.

bending machine

Bending radius of parts

When free bending is used, the bending radius is 0.156 times of the opening distance of the die. During free bending, die openings should be 8 times the thickness of the metal material. For example, the bending radius of the part is approximately 0.078 " when forming low carbon steel with a 1/2 inch opening. If the bending radius is almost small to the thickness of the material, the bottom of the die forming. However, the pressure required for forming a die with a bottom is about four times greater than the pressure required for free bending.

If the bending radius is less than the thickness of the material, use a punch with a rounded radius less than the thickness of the material, and resort to the embossing bending method. In this way, 10 times as much pressure as is required for free bending.

For free bending, punch and die are machined at 85° or less. When using this set of dies, pay attention to the gap between the punch and the die at the bottom of the stroke, and enough to compensate for the rebound to keep the material over-bent at around 90°.

Normally, the springback Angle of the free bending die on the new bender is less than or equal to 2°, and the bending radius is equal to 0.156 times of the opening distance of the die.

For bottom die bending, die Angle is generally 86 ~ 90°. At the bottom of the stroke, there should be a gap between the convex and concave dies that is slightly larger than the thickness of the material.The forming Angle is improved because of the larger tonnage of the bottom die bending (about 4 times of the free bending), reducing the stress that normally causes springback within the bending radius.

The embossing bending is the same as the bottom die bending, except that the front end of the punch is machined into the required bending radius, and the die clearance at the bottom of the stroke is less than the thickness of the material.Springback is largely avoided by applying enough pressure (about 10 times the free bend) to force the punch front end to contact the material.

In order to select the lowest tonnage specification, it is best to plan for a bending radius greater than the thickness of the material and to use the free bending method as far as possible.When the bending radius is large, the quality of the component and its future use are usually not affected.

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