Four major equipment factors and solutions affecting die cutting accuracy

At present, the die-cutting precision of the fully automatic flat die cutting machine produced in China can reach 0.15mm, 0.075mm or even higher. The die-cutting precision plays a decisive role in the production quality of the automatic die-cutting machine, and the die-cutting speed is an important technical index to measure the production efficiency of the die-cutting machine. There is a mutual constraint relationship between the two. The die-cutting precision will decrease with the increase of the die-cutting equipment's use time. This paper will focus on the equipment factors and countermeasures that affect the die-cutting precision.

Influence of the paper feeding part

The continuous paper feeding method is widely used by automatic flat die cutting machines at home and abroad, and most of them rely on electromagnetic clutches to control Feida power and rely on chain transmission. In order to realize the vacuum release of the separation nozzle and the transfer nozzle, the power-driven gas distribution valve distributes the vacuum in different logic periods. However, due to dust, wear and other factors, the split logic time of the power-driven air separation valve will be affected. At present, most automatic die-cutting machines have a paper-feeding detection device, but the paper-feeding detection device will automatically alarm and stop due to the increase of the error, which will also have a certain influence on the die-cutting precision. In addition, the chain transmission error of the paper feeding part, the mechanical wear of the cam, etc. will cause a certain error to the die cutting precision. Because these errors are small, they are often ignored, but the die cutting precision will be accumulated after a certain degree of accumulation. A certain degree of impact, which affects product quality and production efficiency.

Impact of pre-test detection

The electronic eye detection is commonly used as a front gauge detection device by the domestic automatic flat die cutting machine. The detection principle is that when the signal detected by the electronic eye passes through the amplifier, it is transmitted to the PLC (programmable controller), and then the data is transmitted by the PLC. Process and issue an execution command. There are four electronic eyes in the front gauge, the paper specifications are different, and the number of electronic eyes used is different. Generally, two are used at the same time. In order to prevent paper feeding errors and avoid die-cutting waste, it is necessary to clean the front gauge detection device with dry cloth and alcohol, and ensure that the position of the installation is accurate and effective every time the front electronic eye is replaced.

Effect of front and rear positioning blocks

The amount of paper picked up in the gripper row and the positioning of the paper are affected by the front and rear positioning blocks. In order to ensure that each group of grippers can be positioned at the same position, good strength and stability should be used as a prerequisite when selecting the material of the block before and after. The die-cutting accuracy of the product is ensured by adjusting the movement of the gripper row by fine-tuning the action mechanism of the positioning block. Chains, grippers, etc. can be deformed due to the use of die-cutting equipment, which affects the precision of die-cutting. The deformation error can be compensated by adjusting the clearance of the gripper by the positioning block to ensure the die cutting precision of the product. The adjustment mechanism adjusts the positioning position of the single gripper row and the positioning block, and changes the size of the paper flap to achieve the precision adjustment of the single gripper row.

The influence of the positioning mechanism of the gripper

The pick-up side positioning mechanism generally has a fixed positioning on one side and an active positioning on one side. The fixed positioning side abuts against the fixed side positioning plate, and has no gap under the action of the movable side positioning compression spring, thereby improving the lateral precision of the paper conveyance. For some embossed products or scalding products, due to insufficient pressure of the movable side positioning compression spring or wear of the fixed side positioning plate, there is a gap between them, which affects the lateral precision of the paper conveying, thereby affecting the precision of the die cutting. The problem is very common. The method for solving such problems can generally repair the positioning accuracy of the gripper side positioning mechanism by replacing the positioning device on the gripper row or the gripper row, or by adjusting the accuracy of the individual gripper rows. Convenience.

The above-mentioned equipment factors that affect the precision of die-cutting are solved by a simple method. However, due to factors such as intermittent mechanism, turbine vortex mechanism, chain and other equipment factors affecting die cutting precision, large repairs are required to solve.