As we all know, the final accuracy of sheet metal bending products depends on the best:
- Bending equipment
- Bending die system (including die, die clamp and compensation)
- Bending material
- Bending operator
The die system of small cnc press brake includes bending die, die clamping system and compensation system. There is no doubt that the importance of small cnc press brake clamping and compensation system for bending accuracy, but many people in the industry on the bending mold clamping system less cognition, this article let us talk about the bending mold clamping system first, to see how it liberation of labor, so that bending more accurate and efficient!
Before sheet metal bending, sheet metal parts may have gone through a number of value-added production processes such as stamping, cutting and deburring, which requires the bending process to ensure strict accuracy and consistency of accuracy to reduce the generation of expensive waste to reduce costs. We all know that good bending equipment must meet these requirements, yet the importance of a good clamping system is often overlooked! A good clamping system not only saves time, but also ensures accuracy and reduces the number of bending tests. But what are the clamping systems? Below we will share an overview of the advantages and disadvantages of different clamping systems.
Two clamping systems
There are two kinds of mould clamping system of bending machine: manual clamping and automatic clamping. There are different versions of each clamping system on the market.
1. Manual clamping system
The manual clamping system is an effective, economical and mainly used for the bending machine fixture which does not need to change the mold frequently. Traditional manual clamping is the most basic and time-consuming clamping method, requiring the bending operator to manually lock each splint. Individual splints do not automatically form a complete clamping line when locked one by one. The clamping force of each die section is uneven, and the die cannot be aligned immediately, requiring time-consuming debugging and relying on experienced operators. In order to overcome the reliance on humans, avoid debugging, and improve accuracy, Durmapress developed a manual clamping system with a clamping pin structure that provides a consistent clamping force over the entire working length, eliminating the need for debugging after each segment of the mold is clamped. The manual clamping belt automatic seating and automatic calibration mechanism of the clamping pin structure enables the mold to be accurately aligned and seated.
2. Automatic clamping system
Automatic clamping system is a kind of clamping device used for frequent and rapid die change. Based on the concept of "single point of operation", the automatic clamping system can realize the process of clamping and releasing the mold with just one button, eliminating the tedious manual locking experience. The automatic clamping system is powered by electric, hydraulic and pneumatic sources. The most basic automatic clamping system consists of a number of separate segments of the splint and power cylinder, the power cylinder through the above power sources to drive, although this clamping system to avoid time-consuming manual locking mode, but because the splint is still separate segments, the mold positioning accuracy problem still exists. How to avoid activating only a single splint to clamp the mold separately? The disadvantage of poor accuracy in this approach can be achieved by using a medium to drive a mechanism to clamp the die integrally over the full length of the bending machine. Durmapress's automatic clamping system is a full-length clamping mode powered by hydraulic or pneumatic sources.
Durmapress's automatic clamping system is divided into hydraulic and pneumatic clamps. For the hydraulic fixture, the fixture is equipped with hydraulic tubing of the same length as the bending machine. After entering a certain pressure of hydraulic oil, the hydraulic tubing expands to push the hardened clamping pin, so that the mold can be clamped. The hydraulic power of the hydraulic system must always be on to ensure the clamping function (power-locking clamp). For pneumatic fixtures, oil pressure is replaced by air pressure, which allows the mold to clamp and loosen more quickly. Durmapress pneumatic fixture system only uses compressed air to realize the clamping function, and the pressure force is used for the wedge-shaped mechanism with Durmapress patented self-locking function to realize the closed clamping function, so the locking is fast and durable (closed locking fixture).
Manual clamping system is suitable for the application where die change is rare. In this application, we recommend Durmapress manual clamping system: the hardened clamping mechanism can make the mold of each segment correctly positioned, matched and clamped, thus ensuring the bending accuracy. If frequent mold changes are required, we recommend an automatic clamping system:
· High efficiency -- If there is more than one die change per shift, automatic die change can improve bending efficiency and increase profit margin.
· Ergonomics -- Safe operation to avoid injury.
· Manual liberation -- Simple to use and easy to operate, reducing the skill requirements of bending workers and reducing the reliance of enterprises on skilled workers.
If sustainability is more important, we recommend the use of pneumatic automatic clamping system. The pneumatic clamping with self-locking function does not need to be in operation all the time to help reduce the use of hydraulic oil and reduce energy consumption!
Fixture with compensation function
The structural characteristics of the bending machine itself will lead to the deflection deformation of the bending machine beam, which will inevitably lead to the deformation of the bending product. Using Durmapress fixtures with mechanical compensation allows you to solve this problem easily
The distortion of the bending product is caused by the error of the horizontal Tx and vertical Ty during the bending process. The horizontal deviation is caused by the inaccurate center line position, which will affect the accuracy of the side length of the sheet metal bending product. Vertical direction error is caused by the upper and lower mold is not parallel, will affect the accuracy of product Angle. The patented mechanical compensation technology pioneered by Durmapress can compensate the deflection deformation of the bending machine as a whole. With local Ty adjustment, the deformation of bending products can be perfectly controlled to achieve the best bending accuracy of products.
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