When the friction resistance is injected into the plate at the boss, the internal stress is expanded, and the boss is very easy to deform. The smaller the raw materials are reinforced at the punch shoulder, the more likely the marine castings are to be broken at the punch shoulder. Mold damage may be caused by the small gap of marine casting mold, uneven neutralization of concave and convex mold, and the lack of precision of mold seat and mold guide; The punch is too hot due to the continuous and long-term stamping processing of the same die, and the wheel weight in the die design scheme also causes the side force to expand. For example, the side force during step punching, attack angle or shearing will cause the punch to move to one side, resulting in serious die damage and product cracking.

What are the characteristics of stainless steel sintered mesh?

It has extremely high mechanical strength and compressive strength. Good processing, welding and assembly performance, easy to use. The filter layer is in the second layer, which makes it well protected and shunted. The filtering accuracy reaches uniform filtering performance, and ensures its high stability. 316L material is selected, with good corrosion resistance and heat resistance. It can be used for filtering at - 200 ℃ ~ 480 ℃ and acid-base environment. The surface filter structure with better counter current cleaning effect, so the counter current cleaning effect is good, can be used repeatedly, and has a long life. (it can be cleaned by countercurrent water, filtrate, ultrasonic, melting, baking and other methods).

Casting defects have always been a big problem for casting enterprises. If the casting defects are not solved well, the quality of castings will be affected. Casting enterprises have various casting defects such as wear, scratch, sand hole, pinhole, crack, defect deformation, hardness reduction and damage in the process of producing machine tool castings. Next, we will introduce some methods to solve the above problems.

At present, in the market, welding repair is used to repair defects. There are generally the following types: first, argon arc welding: precision castings (alloy steel, stainless steel precision castings), and aluminum alloy die castings are mostly repaired by argon arc welding machine. Some mold manufacturers and repair manufacturers also use this welding machine to repair mold defects. Advantages: high repair efficiency and high precision compared with electric welding machine. There are many kinds of welding wires, which are widely used in stainless steel and aluminum alloy products. It can be used for welding with high strength. Disadvantages: it is used for defect repair. When repairing small defects (air holes and sand holes), there are traces (undercut) on the edge of the molten pool due to excessive impact. There are hard spots on the welded steel parts. Due to the influence of heat, it is easy to produce thermal deformation when welding non-ferrous castings or thin-walled parts. High requirements for operation technology.

Second, electric welding machine: the traditional method used for welding repair of cast iron and steel castings. Advantages: high efficiency in repairing large defects. Disadvantages: the hardness of the welded joint after welding is too high, and there is stress inside, which is easy to produce cracks. Generally, annealing heat treatment is required to meet the processing requirements. And due to the limitation of welding conditions, secondary defects such as porosity and slag inclusion are easy to occur inside.

The above two methods can effectively solve the problems such as wear, scratch, sand hole, pinhole, crack, defect deformation, hardness reduction, damage and other defects generated in the casting process. However, they have advantages and disadvantages, so please choose carefully.