1. Mold maintenance has never been carried out according to the maintenance plan

Not changing springs; not grinding punches or cleaning and lubricating dies. Use heavy-duty, extreme-pressure grease to apply on the plate without lubricating oil and surface wear; don't care about the loss of pins in the mold, and don't lock all the fasteners carefully; don't think about replacing the nitrogen spring until it can't work Components.

Do not replace any springs; leaving broken springs to work will eventually cause your ram to skew and eventually damage the molded part.

Simultaneous use of springs of different sizes and lengths results in very poor spring pressure distribution;

Seeing that the pin is loose, use a hammer to hit the pin hole to roughen the pin to prevent the pin from falling out; the plate is deformed by the impact, and it is not dealt with. We wait for the final plate to crack before welding. Use unsuitable grinding wheels to grind parts; use hard grinding wheels for rough grinding, mold parts will definitely be damaged, and parts will be damaged without using coolant when grinding.

If the mold is not cleaned, there will be waste residue formed by processing and stamping in the gap of the mold. By not checking the cylinders for leaks, you have been overloading them and you end up with premature failure of the seals.

The mold is not checked before the mold is put into the punching machine, but I think the tools have been packed, and I don’t check whether the thickness gauge has fallen on the mold.

2. Deformation of gasket

The gasket will be deformed when it is sheared and stressed, and this deformation will cause damage to the mold parts. Add gaskets to prevent gaskets from warping. If necessary, grind the bottom to keep the top and bottom of the part flat, and the height dimension meets the requirements of the drawing; the number of gaskets under each part cannot exceed 3 pieces. The gasket is preferably fixed to the bottom surface of the part by welding to prevent the gasket from moving.

Make sure that the inner hole size of the gasket is compatible with the leakage size of the waste material, often due to the small leakage hole size of the gasket, the waste material gets stuck in the part.

3. The mold material for welding is not a heat treatment material

When welding the mold material, the parts to be welded are not preheated first; the welding is 10 times your requirement, too much welding; the welded parts are not processed after welding to relieve stress; the cracks of the mold are not ground before welding; Soldering parts directly on a punch press with solder joints flying around.

4. The mold never uses lubricant

Lubricants are never used on dies, especially for drawing of stainless steel or high tensile strength materials. For the mixed use of oil, it is only by testing with your own hands to judge whether it can be used. Regardless of whether the use of oil is effective, it is just randomly applied to the plate; never lubricate the two sides of the material; using high chlorine lubricants on the tungsten steel mold will damage the tungsten steel parts.

Install a large-tonnage, high-precision mold on an old punch with a large guide gap; there are cracks on the body of the punch; the use of the maximum tonnage of the punch causes the skew of the punch, resulting in damage to a large number of punches and die parts; Concerned about whether the slider is parallel to the platform, just thought the die would guarantee all the required parallelism.

6. The mold closing height is not set correctly

The limit block is not used correctly or the limit block is removed, and the closed height of the mold is judged by the sound of the mold closing and impact; if the product is unqualified, the mold height is continuously reduced to obtain a good product, and this method will eventually damage the mold and punch. .

7. Protection without mold

Not using the guards on the mold, turning them off or not using them properly, not relying on the equipment but on the operator to spot problems quickly and avoid mold damage.