Square and round pipe punching machine Prevent eccentric strike

1. Regularly adjust the clearance between the guide rail, sliding block and the guide pillar and guide sleeve of the mold to prevent eccentric strike.

2. In addition to adjusting the gap between the upper and lower blades of the shearing machine tool, attention should be paid to the use of the pressing plate, which can avoid the tool edge cracking due to rebound and dislocation during the shearing process.

3. During blanking, try to use positioning device: positioning panel, punching positioning cover plate, etc. to reduce the possibility of eccentric blanking.

Equipment matching method

Square tube Pipe punching machine The type of equipment shall be selected according to the process nature, batch size, geometric dimension and precision grade of the workpiece to be completed. From the perspective of safety, the open press (C-type bed) is generally not as good as the closed press; Mechanical press is not as good as hydraulic press; The free forging hammer is not as good as the die forging hammer. Of course, it should also be determined according to the actual situation on the spot, which cannot be generalized. In addition, pay attention to:

1. The size of the press table should be larger than the plane size of the mold, and there should be room for fixing the mold. The leakage hole on the table should be compatible with the process to be carried out.

2. The width of the lower anvil of the forging hammer should match the size of the upper anvil, and the length of the lower anvil should be slightly larger than the upper anvil. The dovetail contact surface of the forging die shall match the tonnage of the equipment, and the contact surface shall be kept clean without sundries embedded.

3. The height from the press to the large mold mounting ≤ Hmax - 5mm (from the Hmax press to the large stroke).

In the pressure processing industry, object strike injury accidents are serious for three reasons:

1. Pressure processing machinery, such as mechanical presses, hydraulic presses, forging hammers, shearing and punching machines, all rely on huge energy to work.

2. The cause or harm of the injury is mostly caused by molds, tooling and tools. It is difficult to work by the protection of the equipment itself. Generally, measures should be taken from the process.

3. The injury mode is irregular, and it is difficult to determine the direction of the flying out of the cause and harm. It can be seen that the object strike injury accidents in the pressure processing industry have their own characteristics, and the preventive measures must be targeted, otherwise it is difficult to work.

The causes of object strike are as follows:

1. The stress concentration caused by improper use or unreasonable structure leads to damage of the mold and flying out of the mold pieces.

2. Defects of the module itself, such as surface cracks, fatigue cracks, and too high hardness, cause mold fragments to fly out.

3. The mold and tool materials are improperly selected, causing the mold and tool to fly out and pop out due to local damage.

4. The mold does not match the equipment, the mold is deformed, damaged, and fragments fly out.

5. The gap is not adjusted in time, which causes the mold and tools to crack and the fragments to pop out.

Reasonable material selection method

Square tube and round tube Punching machine Practice has proved that, Rack punching machine The uneven distribution of carbides in the steel results in uneven distribution of grains, which has a great impact on the plasticity and toughness of the steel. Therefore, a general principle for die material selection is to control the austenite grains, and try to select the steel with essentially fine grains (grain size>grade 6), and the distribution should be uniform. In addition, the following points can be noted:

　　1. Zinc steel guardrail punching machine The casting structure defects (segregation, inclusion, looseness, etc.) in large metal dies should be minimized and eliminated. The outer die sleeve of insert die should use forging module as much as possible.

2. When opening the cavity, pay attention to the streamline direction of the metal for the metal mold with large stress, so that the direction of the tensile stress is as consistent as possible with the streamline.

3. For extrusion processing, the allowable deformation degree shall be determined according to the unit compressive stress that the extrusion die can bear. When the total deformation degree exceeds this value, the extrusion shall be divided into multiple processes to avoid damage to the die due to the unit extrusion pressure exceeding the limit that the die bears.

4. The materials of operating tools used for pressure processing are also very particular. Generally, the materials of operating tools are soft low-carbon steel or aluminum alloy, which can avoid injuries caused by improper use of operating tools.