Teach you how to choose the correct bending machine

In the purchase of bending machine once the choice is not correct, the cost of production will rise, bending machine can not be expected to recover costs. Therefore, there are several factors to be weighed in the decision.

The first important issues worth considering is that you want to produce parts, the point is to buy a table to complete the processing tasks and the shortest, the minimum machine tonnage.

Carefully consider the material and the maximum thickness and length. If most of the work is the thickness of 16gauge, the maximum length of 3M low carbon steel, then the free bending force must not be greater than 50 tons. However, if in the bottom of dies. The forming, may be considered a 160 ton machine.

Assuming the thick material is 1/4 inches, 10 foot free bending needs 200 tons, while for the die bending (bending correction) needs at least 600 tons. If most of the workpiece is 5 feet or less tonnage almost halve so as to greatly reduce the cost of purchase. The length of the part is very important to determine the specifications of the new machine.

At the same load, the deflection of the 10 foot machine table and slider is 4 times the size of a 5 foot machine. That is to say, the shorter machine needs less shim adjustment, can produce qualified parts. Reduce gasket adjustment and shorten the preparation time.

The bending radius is 0.156 times of the opening distance of the concave die when the bending is free. In the free bending process, the opening distance of the die should be 8 times the thickness of the metal material. For example, when using a 1/2 inch (0.0127 m) opening to form a low carbon steel of 16 gauge, the bending radius of the part is about 0.078 inches. If the bending radius is almost as small as the thickness of the material,

Must be carried out for the die forming. However, for the die forming the required pressure is about 4 times larger than the free bending.

If the bending radius is less than the thickness of the material, it is necessary to use the tip radius less than the thickness of the punch, and turn to the impression bending method. In this way, it will take 10 times the pressure of free bending.

In the case of free bending, the punch and the die are machined by 85 degrees or less than 85 degrees. When using this set of mold, pay attention to the gap between the punch and the die at the bottom of the stroke, as well as enough to compensate for the rebound of the material to maintain 90 degrees or so excessive bending.

Usually, the springback free bending die bending machine produced in the new angle less than 2 degrees, the bending radius is equal to 0.156 times the die opening distance.

As for the die bending die angle is generally 86 ~ 90 degrees. At the bottom of the trip end, there should be a slightly larger than the thickness of the material between the punch and die clearance. The forming angle can be improved, because for the die bending of large tonnage (about 4 times of bending free), reduce the range of bending radius usually stress caused by the springback.

For the die stamping bending and bending of the same, but the bending radius of front-end processing to the punch and die clearance, the bottom end of the stroke is less than the thickness of the material. Due to the application of sufficient pressure (approximately 10 times of free bending) to force the front end of the punch to contact the material, the springback is largely avoided.

In order to select the lowest number specification, the best bending radius is larger than the thickness of the material plan, and as far as possible using free bending method. When the bending radius is large, it often does not affect the quality of the component and its future use.

Even if there are shelves of mold, do not think that these molds suitable for the new machine. The wear of each die must be checked by measuring the length of the front end to the shoulder and the length of the die shoulder.

For conventional mold, the deviation should be around 0.001 inches per foot, and the total length deviation is not greater than + + 0.005 inches. As for the finishing die, the accuracy of each foot should be 0.0004 inches or less, with a total accuracy of not more than + / - 0.002 inches.

Assuming a 5 x 10 foot 10-gauge low carbon steel plate is bent at a temperature of about 90 degrees, the bending machine may have to apply an additional pressure of about 7.5 tons to lift the steel plate, and the operator must be prepared for the drop of the weight of the weight of 280 pounds. This part may need several robust and strong workers and even a crane. Bending machine operators often need to bend long side parts, but do not realize how hard their work.