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Vacuum Brazing Furnace

Vacuum Brazing solutions for Cutting and Grinding Tools

Cutting and grinding tools refer to the knives used by mining machinery to cut coal and rock. Working under complex and changeable working conditions is the part with the greatest loss in the construction of rotary drilling rigs. The failure forms of cutting and grinding tools mainly include alloy head falling off, edge chipping, wear, and breaking, among which alloy head falling off is the most Common form of damage. Therefore, the brazing quality of cutting and grinding tools is highly valued.

In the production of traditional cutting and grinding tools, high and medium frequency induction brazing or gas flame heating are often used for brazing.

Traditional induction brazing process production line

The cutting and grinding tools are placed on the chain transmission equipment, and are welded, tempered and heated at the same time through the saddle-type open intermediate frequency furnace at a uniform speed at the set speed.

This new process can avoid problems caused by secondary heating in the traditional process: brazing surface oxidation, alloy embrittlement, annealing of cutting and grinding tool tips, and reduced welding strength.

Equipment advantage

The cutting tool has stable comprehensive mechanical properties and high strength;

The weld seam is full and full, the appearance is exquisite, and the welding strength is high;

Save labor and time, only two people need to load and unload the material to operate the whole set of equipment;

Power saving, more than 30% power saving than traditional crafts;

Improve efficiency: Different models can produce 4-6 finished products per minute;

These two traditional processes are not easy to guarantee the brazing quality of cutting and grinding tools, the production efficiency is low, and the pick body is inevitably damaged by oxidation and decarburization.

Another process for brazing cutting and grinding tools Vacuum brazing, vacuum oil quenching

The vacuum brazing process is mainly to send the cutting and grinding tool assembly installed in the fixture into the brazing chamber of the furnace and heat it. When the temperature of the cutting and grinding tool assembly exceeds the melting point of the solder, the solder wets and flows In the weld gap between the pick body and the cemented carbide, during the formation of the bond, the brazing material forms a solid solution with the surface of the steel and the cemented carbide.

After the vacuum brazing of cutting and grinding tools is completed, move them into the cooling chamber of the furnace to cool until they cool to a suitable temperature, that is, vacuum quenching.

The main features and advantages of the vacuum brazing process are:

1.Prevent oxidation and decarburization

Vacuum brazing can adopt a full vacuum environment in the brazing (heating) chamber and cooling chamber of the furnace, which completely prevents the oxidation and decarburization of the substrate and welding materials during brazing and cooling. At the same time, the complete vacuum state can also make the molten solder wet the surface of the joint well without flux, avoiding the production of fine cavities in the weld and improving the welding strength.

2.Mass production

Vacuum brazing and quenching can use a batch furnace, which can perform a large number of brazing at a lower unit cost. It also has good adaptability to occasional small batch production, especially when vacuum brazing and vacuum quenching of cutting and grinding tools are combined, the most economical effect can be achieved. Although the amount of furnace can be more, the heating, cooling and quenching time of vacuum brazing are longer, and the efficiency is slower than that of automatic line production.

3.The quality of vacuum brazing is stable and reliable

The temperature control and operation of cutting and grinding tool brazing equipment adopts computerized digital monitoring, and its brazing quality and stability are fully guaranteed by the advanced nature of the equipment. However, the brazing quality of the traditional brazing method depends too much on the technical level and operational proficiency of the operator. In addition, due to the high degree of automation of the vacuum brazing quenching furnace, the labor intensity of the operators is greatly reduced, and the working environment is greatly improved.

Vacuum brazing and quenching of cutting and grinding tools is more and more common because of its high production efficiency, stable quality of brazed joints, heating, vacuum brazing and cooling and quenching in a vacuum environment, so that the pick can avoid oxidation and decarburization was adopted.

When selecting cutting and grinding tools, learn about the vacuum brazing process of the grinding tools, and try to choose picks produced by suitable brazing processes within the acceptable range of cost.