Analysis and Treatment of Deformation Phenomenon in Flat Die-cut Die Making

The forming process of the automatic machete machine is a method of forming steel knives and steel wires that has gradually emerged in recent years. It is generally used in conjunction with a laser cutting machine to jointly complete the production of a die cutting plate. The fully automatic computer numerically controlled machete machine integrates cutting, machete, punching, and chamfering into one machine at a time. It can be said that it is a qualitative leap in the machete process. The machete graphics used in the automatic machete are taken directly from the graphic design of the product. When working, only the graphics are input, the quantity to be formed is input, and the machine can complete the machete forming. During processing, the blade is fed into a specially designed channel that holds the blade tightly and is described as flying and accurate. The machine accepts a straight knife line, but it is best to use a package knife line, which increases speed and saves material.

After the steel knife and steel wire are formed and processed, it is required to place the cut back plate on the platen during installation, and place the processed knife line down on the back, aiming at the corresponding bottom plate position, and use the special knife mold hammer to hammer the upper part. Edge, set it in the template. Hammer must use a special knife die hammer or wooden hammer, the head of the die hammer is made of high elastic rubber. When cutting the knife edge, it can guarantee not to hurt the edge. In recent years, automatic loading machines have also emerged, which have greatly improved the speed and quality of loading.

Fourth, open the connection point

In the process of die-cutting plate making, opening the connection point is an essential process. The connection point is to open a small mouth with a certain width at the edge of the die cutting knife. During the die cutting process, the scrap side is still partially connected to the entire print sheet after die cutting without spreading, so that the paper can be smoothly fed in the next step.

The special equipment that should be used to open the connection point is a knife-line puncher, that is to use a grinding wheel to grind, instead of using a hammer and tweezers to open the connection point, otherwise it will damage the knife line and feet, and prone to burrs at the connection part. Widths of different sizes are 0.3, 0.4, 0.5, 0.6, 0.8, 1.0mm, etc. The common specifications are 0.4mm. The connection point is usually made in a hidden place that the molded product cannot see. After the molding, the connection point at the appearance should be as small as possible so as not to affect the appearance of the finished product. In addition, care should be taken not to open the connection point in the bridge position (the die cutter at the bridge position is vacant).

Fifth, paste sponge tape

After the steel knife and steel wire are installed, in order to prevent the die cutter from sticking to the paper during die cutting and indentation, and smooth paper feeding, elastic sponge strips shall be attached on both sides of the knife line. The role of elastic sponge strips in die-cutting is very important. It directly affects the speed and quality of die-cutting. In general, sponge tape should be 3 to 5mm above the die cutter. In different die-cutting machines, sponges with different hardness, size and shape should be selected according to the speed of die-cutting, die-cutting jobs and relevant conditions. The following principles can be followed when selecting specific elastic sponge strips:

1. Hard sponge strips should be placed in the gap at the lower edge of the die cutting edge. The soft sponge strips should be placed under the die cutter or in the gap between the die cutter and the die cutter.

2. If the distance between the cutting force is less than 8mm, the sponge strip with the hardness of HS600 should be selected.

3. If the distance between the die cutters is greater than 10mm, choose a sponge tape with a hardness of HS250 (corrugated board) or 350 (cardboard).

4. If the distance between the die cutter and the steel wire is less than 10mm, the arched sponge strip with the hardness of HS700 should be selected; if it is larger than 10mm, the sponge strip with the hardness of HS350 should be selected.

5. The punching position of the die cutter uses an arched sponge strip with a hardness of HS700 to protect the joint from being pulled off.

6. The ideal distance between the die cutting strip and the knife line is 1~2mm.

Six, test cutting pad

After the die-cutting plate is processed, the die-cut plate is firstly put on the die-cutting machine for test cutting. If the test-cutting sample is partially normal and part of the cut is continued, it is necessary to perform the padding in a local area. Pressure." Pads are affixed to the bottom of the die plate using a 0.05mm thick pad board to compensate the die cutter highly. When there are still individual knife lines after the partial backing plate is not cut through, positional backing plates are required. Positional backing plates are used to make the height of the cut lines directly adhered to the bottom of the die cutter with a narrow backing plate. This process also has a direct impact on the quality and speed of die-cutting, and it has higher experience and technical requirements for operating workers.

Through the above several processes, the production of die-cut version is basically completed. The produced die-cut version can be produced on the machine. However, before the formal production, it must go through the “indentation root” (in order to facilitate the formation of indentation, commonly used Methods such as manual stick-bottoming and sticking-molding methods, trial die-cutting, and customer sign-off procedures can be used for formal production.