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How to choose the right bending machine

How to choose the right bending machine

  • Categories:solution
  • Time of issue:2019-08-30 15:53
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(Summary description)In the purchase of bending machine once the choice is improper, the cost of production will climb, the bending machine can not be expected to recover the cost. There are, therefore, several factors that need to be taken into account when deciding on the plan.

How to choose the right bending machine

(Summary description)In the purchase of bending machine once the choice is improper, the cost of production will climb, the bending machine can not be expected to recover the cost. There are, therefore, several factors that need to be taken into account when deciding on the plan.

  • Categories:solution
  • Time of issue:2019-08-30 15:53
  • Views:
Information

In the purchase of bending machine once the choice is improper, the cost of production will climb, the bending machine can not be expected to recover the cost. There are, therefore, several factors that need to be taken into account when deciding on the plan.

artifacts

The first important thing to consider is the parts you want to produce. The point is to buy a machine that can do the job with the shortest workbench and the smallest tonnage.

Carefully consider the material grade and maximum machining thickness and length. If the bulk of the work is low carbon steel with 16 gauge and maximum length of 10 ft, then the free bending force need not be greater than 50 t. However, if you are doing a lot of bottom die forming, you may want to consider a 160-ton machine tool.

Well, assuming the thickest material is 1/4 inch, 200 tons for 10 ft free bending and at least 600 tons for bottom die bending (corrected bending). If large parts are 5 feet or shorter, the tonnage difference is less than half, thus greatly reducing the cost of acquisition. The length of the part is important to the specification of the new machine.

Flexible change

Under the same load, 10 feet machine table and slider up the deflection is 5 feet machine 4 times. This means that shorter machines require fewer gasket adjustments to produce qualified parts. Reducing the gasket adjustment also shortens the preparation time.

Material grade is also a key factor. Compared with low carbon steel, the load required by stainless steel is usually increased by about 50%, and most grades of soft aluminum reduced by about 50%. You can always get the tonnage table of the machine from the manufacturer of the bending machine. This table shows the tonnage per foot of length estimated for different thicknesses and materials.

The bending radius of the part

When free bending is used, the bending radius is 0.156 times of the opening distance of the die. In the free bending process, die opening distance should be 8 times the thickness of the metal material. For example, when forming 16 gauge mild steel with 1/2 inch pitch, the bending radius of the part is approximately 0.078 inches. If the bending radius difference is not too small to the thickness of the material,

Bending machine

The bottom die must be formed. However, the pressure required for the bottom die forming is about 4 times larger than that for free bending.

If the bending radius is less than the thickness of the material, the front fillet radius is less than the thickness of the punch, and resort to embossing bending method. In this way, 10 times the pressure of free bending is required.

For free bending, punch and die are machined at 85° or less (smaller is better). When using this set of dies, take care that the punch and die are sufficiently free at the bottom of the stroke and that excessive bending of the material is sufficient to compensate for springback and maintain the material at about 90°.

Usually, the free bending die in the new bending machine produced by the rebound Angle is less than 2°, the bending radius is 0.156 times of the opening distance of the concave die.

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

Embossing bending and bottom die bending is the same, only the front end of the punch is processed into the required bending radius, and the bottom of the stroke of the gap between the punch and die is less than the material thickness. Because enough pressure is applied (approximately 10 times that of free bending) to force the front end of the punch into contact with the material, springback is largely avoided.

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 whenever possible. When the bending radius is large, it often does not affect the quality of the pieces and their future use.

The degree of

Bending precision requirement is a factor that needs to be carefully considered. It is this factor that determines whether you need to consider a CNC bending machine or a hand-controlled bending machine. If bending accuracy requires ±1° and cannot be changed, you must focus on CNC machine.

CNC bending machine slider repetition accuracy is ±0.0004 inches, forming the precise Angle must be used with such accuracy and good mold. Hand controlled bending machine slider repetition accuracy is ±0.002 inches, and under the premise of the use of the appropriate mold will generally produce ±2~3° deviation. In addition, CNC bending machines are ready for quick mold assembly, which is an undeniable consideration when you need to bend many small batches of parts.

The mould

Even if you have a shelf full of molds, do not consider them suitable for your new machine. Each die must be checked for wear by measuring the length of the punch from the front to the shoulder and between the shoulder of the die.

For conventional molds, the deviation should be about ±0.001 inches per foot, and the total length deviation should not be greater than ±0.005 inches. For fine grinding dies, the accuracy shall be ±0.0004 inches per foot, and the total accuracy shall not be greater than ±0.002 inches. It is best to use the fine grinding die for CNC bending machine and the conventional die for manual bending machine.

Side length of bending piece

Assuming a 90° bend along a 5 x 10 foot 10-gauge low carbon steel plate, the bending machine would have to apply approximately 7.5 tons of additional pressure to lift the plate, and the operator would have to be prepared for a 280 pound straight side landing. Making the part may require several able-bodied workers or even a crane. Bending machine operators often need to bend long side parts without realizing how strenuous their work is.

There is now a supporting device suitable for the workshop where the work is done, which can be modified to suit the needs of the old and new machines. By using this device, only one person is required to control the forming long side parts.

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