What are the common problems of bending and clamping in CNC bending machine?

In the long-term processing, although the CNC bending machine is regularly maintained, for fixtures, molds and other easy-to-wear parts, simple maintenance can no longer guarantee the bending accuracy requirements, resulting in the angle of the formed workpiece often undulating. Excessive bending angle will affect the bending accuracy of the workpiece, and even affect the normal progress of subsequent welding and other processes. As a result, the operators complained that it takes time to install the knife and screw, set the knife, knock the splint/clamping block, and place the paper in the bending mold, which makes it take longer and longer to debug the product; the management complains that the equipment waiting time increases , The production schedule has been delayed, the product quality has dropped, and lean production is nowhere in sight; the boss complained that the personnel cost has not dropped, the equipment is depreciated as usual, and the product accuracy is getting lower and lower.

What are the common problems of bending and clamping in CNC bending machine? How should the bending machine be upgraded?

CNC bending machine

How to help sheet metal companies increase productivity, improve product processing accuracy, and reduce unnecessary equipment downtime and waste by upgrading the clamping system of the bending machine. For this reason, WILA provides an efficient solution for upgrading the clamping system of the bending machine. Take a CNC bending machine as an example. The nominal pressure of the bending machine is 80t, the table length is 2.6m, and the maximum opening height is 500mm. The upper bending die is fastened by manual quick clamping, and the lower bending die passes through The screw locks the lower mold base on the lower mold guide rail.

The original configuration of the bending machine. The equipment was put into use in 2007. The equipment is operating in good condition and the overall production efficiency has slowed down. The working conditions before the upgrade are as follows.
⑴ It takes 5 to 10 minutes to fill the full-length upper die, and the segmented upper die is used, especially when the clamping position is special, it takes longer to install the knife.

⑵ There is no quick clamping function when the bending upper die is reversed, and the screws need to be tightened manually. It takes 15 to 30 minutes to fill the full-length upper die; if the segmented upper die is selected, the clamping time is increased accordingly.

(3) For bending special-shaped workpieces, the mold clamping position needs to be considered, and the quick clamping is manually moved multiple times.

⑷After changing the mold, the upper and lower molds need to be adjusted frequently.

⑸ The lower mold base needs to be disassembled and the direction changed, which increases the labor intensity of the operator.

⑹Anhui Yongya has a large angle deviation when bending long-size workpieces. It is necessary to adjust the angle by means of padding paper, knocking clamp block and other means.

In view of the structural form, opening height and product characteristics of the upper and lower beams of the bending machine, the upgrade plan mainly selects the upper hydraulic clamp of the WILA standard model NSCL-I-HC/ES II-2550 and the model OB-I-HC -Ty/ES IV-2550 lower hydraulic clamps, these hydraulic clamps have the characteristics of fast, safe, and uniform force, which can make the mold automatically seated, automatically calibrated, and the bending process is more time-saving and labor-saving. In addition, the transformation plan also selects the upper mold of model BIU-021 and the lower mold of model OZU-010. The key dimension accuracy of these molds can reach ±0.01mm. Due to the use of CNC deep hardening technology, the hardness can reach 56 ～60HRC, the hardening depth is 4mm, which guarantees high precision and durability. After the upgrade, the new clamping system has realized the following functions.

What are the common problems of bending and clamping in CNC bending machine? How should the bending machine be upgraded?

Bending machine

The upgraded equipment:
⑴ One button signal can realize all the upper and lower molds are fully clamped in about 3 seconds.

⑵ After the fixture is installed and calibrated for the first time, the Tx/Ty alignment is completed, and subsequent mold replacement is permanently free of tool alignment, and the mold is installed and used immediately.

⑶The mold is equipped with knives in the front and back, and the bending center line of the upper and lower molds is the same.

⑷ It only takes 1 to 2 minutes to fill the full-length upper mold, and the upper and lower molds can be clamped at the same time.

⑸The mold can be clamped at any position of the fixture.

⑹ The fixture comes with a local fine-tuning function of angle, which can compensate the accumulated errors of the plate and equipment.

The full-length carbon steel plate has been used for bending tests many times, and the bending angle deviation range is controlled within ±0.2°. In addition to the accuracy of the bending angle meeting the customer’s requirements, due to the rapid die change without tool setting and hydraulic clamping, etc. A series of advantages, equipment downtime and waiting time are greatly reduced, the experience requirements for operators and labor intensity are reduced, and the comprehensive use efficiency is increased by 30%.

In the context of economic globalization, companies have increasingly higher requirements for lean production, efficiency improvement and cost control. The efficient solution for the upgrade of the WILA clamping system meets the requirements of customers for the quality of precision sheet metal, while greatly improving the discount. The bending productivity has a high return on investment.