Difference between open and closed punch presses

1.Structure Difference

The biggest difference between the two kind machine: open punch is C-shaped and closed punch is H-shaped.

2.Difference between workstation tonnage and accuracy

Open punching machines are not as good as closed punching machines because of the limitation of tonnage and precision.

For hardware processing factories, it is often necessary to change the die frequently when producing stamping parts. Whether it is an open or closed press, the traditional way of changing dies is time-consuming, laborious, affects productivity and has unsafe factors.

Therefore, many companies have an urgent need to improve the die change method of presses, but they cannot find a suitable method, so they can only put it aside for the time being.

The Quick Die Change System for presses can help you to shorten the time of die change, make the die change effortless and automatic, ensure the safety of the employees involved in the die change process, and improve the production efficiency.

3.In terms of throat depth and punching force of the machine

The back body of open type CNC punching machine is generally at 1250mm, once it exceeds 1250mm its processing accuracy will be seriously affected, so these are extremely unfavorable to some manufacturers who require high processing accuracy. The closed type CNC punching machine completely overcomes this drawback of the open type CNC punching machine, and its throat depth can reach 1500mm. In addition, the punching force of the open type CNC punching machine is about 25 tons when the throat depth is 1250mm, and it is difficult to reach 30 tons. While the punching force of closed type CNC punching machine can reach more than 30 tons, the performance of closed type cooling tower is slightly better in this aspect.

4.In terms of machining accuracy

When the open type CNC turret punching machine turret changes the die, the adjustment is more troublesome, and the parallelism between the feeding platform and the punching machine is difficult, and it is easy to tilt, resulting in the production of burrs on the processed products. This is the open CNC punching machine processing in the use of the process so that users more headache. Manufacturers of CNC punching machine efficiency, high speed, the pursuit of high precision, indeed, its technical performance has been continuously improved, but this makes the operator to become the machine efficiency of the obstacles. Therefore, automatic loading and unloading devices for punching machines and automatic die changing devices for external die storage became part of the highly efficient CNC punching machines were put on the agenda, giving rise to the closed type CNC punching machines. Closed type CNC punching machine processing is completely free of burrs and other problems, because closed type CNC punching machine turret die change is integrated, automatic adjustment, production and processing in one go, in a great extent the accuracy of processing, to avoid such problems.

5.In terms of processing efficiency

Open type CNC punching machine processing stamping times in about 220 times, at low speed in about 160 times, in order to process accuracy. If more than the number of stamping, not only processing accuracy is difficult, but also the wear and tear on the machine is extremely serious, while the closed CNC punching machine can reach 180 times at low speed operation, and 260 times at high speed under the premise of accuracy, which greatly improves production efficiency.