The casting industry has been a difficult problem. The rejection rate of ordinary cast iron in China is about 7%, the rejection rate of advanced and complex parts is about 10%-15%, and the aluminum alloy die casting is about 8%-10%.

The main defects focus on the appearance of the casting or outside the emergence of sand holes and so on. About 80% of the defects can be saved by repair. There are many causes for the defects. In the process of casting mold design and manufacturing, if there is no scientific and rigorous design and performance, the rejection rate will emerge and progress.

With the improvement of industrial skills, the casting industry has gradually developed from low-end products to high-end castings. More and more enterprises have paid attention to the economic benefits brought by casting repair. So, what are the methods adopted by each enterprise to repair the defects of castings?

First, foundry glue

Simple, intensive castings and individual repairs require no further processing and no special strength or hardness requirements. The contrast of added value of this kind of casting is low.

Second, the welding repair

Most foundry manufacturers choose welding repair to deal with the defects of casting. Welding repair adopts metal filling material (welding material and casting material matching), welding performance basis can reach the specification of the base material, and the operation is simple, welding efficiency is also very high, recognized and trusted by many manufacturers. At present, the market, welding machine varieties are very wide, used in the repair of defects, there are mainly the following kinds

Three, electric welding machine: cast iron, cast steel welding repair to take the traditional method.

Strengths: repair big shortcomings, high effectiveness.

Disadvantages: after welding spot hard crossing is very high, easy to crack, individual also need to return hot processing to meet the needs of processing. Due to the limitation of welding conditions, secondary defects such as machine holes and slag inclusions are easy to occur.

Four, argon arc welding: fine casting (alloy steel, stainless steel investment casting), aluminum alloy die casting adopt argon arc welding machine welding repair. Local mold manufacturing and repair manufacturers, also take the welding machine to repair mold defects.

1, advantages: high welding effect, higher accuracy than welding machine. Welding wire varieties, stainless steel, aluminum alloy products are also widely used. Can be used for welding, high strength.

2, disadvantages: used for defects repair, small defects repair (pores, trachoma), because of the impact is too large, there will be traces of the molten pool edge line. Welding repair steel parts will appear hard spots. Affected by heat, welding non-ferrous castings or thin - wall parts, easy to occur deformation. It needs to be operated by professionals.

Five, cold welding machine

Axt-9500 edM welding repair machine and AXT-J300 precision cold welding machine are produced by Anxingte

It is a newly born repair technology, which is called cold welding machine. After the development of recent years, the use of welding machine direction and skills have been greatly improved, has occupied a very large share in the repair market.

Axt-9500 edM surfacing repair machine practical scale is very wide

Development of cold welder ---- Casting repair (Repair) (Figure 1)

Casting repair;

Automobile parts casting products: automobile crankshaft, piston, cylinder block, inlet and exhaust pipe, brake disc and other casting defects repair, such as trachoma, porosity and so on.

Machinery industry and machine tool industry: correction of out of tolerance or wear of the workpiece, such as repair machine guide rail, bed, large machinery shaft, tooth parts, steel rolling with cold, hot roller, hydraulic rod engineering machinery, printing press roller and other various parts of the welding repair.

Aviation and shipbuilding industry: compressor shell, air compressor shell, stainless steel delicate parts, delicate shaft, etc.

Petrochemical, coal, construction machinery and many other industries of product repair.

Non-ferrous metal parts in various industries, such as aluminum alloy parts of SF6 transformer in electric power industry, aluminum alloy cylinder block, cylinder head, wheel hub, aluminum alloy impeller of fan, aluminum alloy radiator and so on.

Copper alloy plumbing valves, fittings, etc.

Injection mold: weld and repair the wear, scratch and scratch of the mold to eliminate the flitting and burr of the product.

Die casting mould: zinc aluminum die casting mould corrosion mark, fall off, harm, as well as cavity and gate surface strengthening, prolong the application life of the mould.

Axt-j300 precision cold welding machine also applies to many scenarios, the following is mainly to solve those problems:

Development of cold welder ---- Casting repair (Repair) (FIG. 2)

Casting repair:

Suitable for all kinds of metal materials (including copper and aluminum) made of workpiece can be welded

1: mold industry 1, injection mold 2, stamping die 3, die casting die 4, rubber die 5, copper alloy die. After repair welding, the mold can be machined, heated and nitriding.

Two: thin stainless steel plate welding, such as: stainless steel table, steel pipe.

Three: casting industry:

The welding machine also has a good performance in casting defects. The pores, slag holes and shrinkage holes in casting can be repaired quickly and accurately. The repair effect of ductile iron, gray iron, stainless steel and other defects is very good, fast welding repair speed, no color difference or small color difference after welding, suitable for the needs of factory scale consumption. The machine tool track surface, which was considered difficult to repair, was also solved.

Four: all kinds of workpiece parts repair industry:

This machine can repair shaft, tooth and other workpiece very well.