Tungsten carbide coating method

Nowadays, people put forward higher requirements for tools, equipment and machines in terms of toughness, hardness and surface wear resistance. Through normal hardening treatment, it is certain that only toughness or hardness can be obtained. However, in practice, there is a need for a feature between the two. In order to find a coating material that can produce more wear-resistant, the following ways can be achieved:

1. Electroplating method, which can generate hard layer and 2 Plasma spraying method, 3 Electrocorrosive tungsten carbide coating

In terms of heavy stress, the bonding strength of the above 1 and 2 coatings is not satisfactory because the coating may fall off. However, using the third method, a very wear-resistant tungsten carbide surface can be coated where the workpiece needs high stress.

Characteristics of tungsten carbide coating

The coating coated with tungsten carbide can be perfectly combined with steel. The coating bonded in this way can withstand almost any mechanical stress. Even the impact, bending, tensile or compressive strain can not remove the coating, and even a small part of the coating can not be removed. They can only be treated by grinding or special sand blasting. Of course, they can also be reground with diamond or silicon carbide. The substrate steel under the coating will not be softened due to the coating, but the hardness on the steel is much higher. For some alloy steels, tungsten carbide coating can even penetrate into the substrate. The hardness of this coating is as high as hrc82, and the workpiece will not change, twist or deform, because the coating is actually cold all the time during the deposition process. The coating has high heat resistance. The coating surface is uniform without directional lines.

working principle

Runqia tungsten carbide spraying function works according to the principle of electric corrosion. The tungsten carbide electrode is connected to the positive pole of a DC circuit, which is connected with many capacitors of different capacities, so as to effectively adjust and control the current and voltage.

The vibrator (spray gun) oscillates the electrode, which makes it in contact with the workpiece to be processed. The workpiece is connected to the negative electrode. When the electrode contacts with the workpiece, an ionization field is generated, which ensures the oxygen free combination between tungsten carbide and the substrate. This ionization field is continuously regenerated under the continuous action of the vibrator. The workpiece surface will obtain a higher hardness surface and cutting edge after similar pulse discharge, and it is more wear-resistant. In the short pulse contact process of less than 1 / 100 second, the electrode is heated rapidly, so that the particles of the electrode (such as tungsten carbide) are carried out and quickly melted on the tool surface to form a coating. A dense hard metal layer is formed after the electrode moves back and forth for many times. In addition, it will not exceed the preset coating thickness, because it will automatically stop ingesting materials once the coating saturation reaches the requirements. The selected coating thickness is so accurate that it usually does not require any final process. However, it can still be ground and polished if necessary.

The high-quality and low-cost runqia electronic technology tungsten carbide coating machine provides you with the secret method of increasing processing efficiency and reducing cost. The wear resistance of dies and workpieces treated by discharge coating can be increased by 3 ~ 6 times. The workpiece with discharge coating can increase its surface hardness, which is about 82 ° of Rockwell hardness, so it can effectively prolong the service life of the workpiece.

Characteristics of tungsten carbide coating machine

1. Improve the surface structure, increase hrc82 ° of carbon steel, stainless steel, alloy steel, high-speed steel, tungsten steel and other materials, and increase the wear resistance by 3-6 times.

2. The machine is small in size, does not occupy space, light in weight and easy to move. It is suitable for on-site work. Large molds do not need to be disassembled and can be handled for important parts.

3. Tungsten based cemented carbide penetrates into the structure of the workpiece to enhance wear resistance and impact resistance. It will not damage the structure of the base metal at all, and the parts of the discharge coating are not easy to be brittle and cracked.

4. The thickness and thickness of the discharge coating can be controlled by the host and the adjustment switch. The thickness of the discharge coating is adjusted from 0.005 ~ 0.175mm by the NC display, and the discharge plating layer is uniform.

5. The outer diameter, inner diameter and right angle wall surface of general steel metals can be treated.

6. The only material consumed by the machine is the electrode, which consumes very little and requires low cost.

7. In terms of saving downtime, tool exchange, mold regrinding and tool mining structure, rocklinizer 800e can achieve its value recovery in a very short time.

■ the surface hardness of the material with electroplated layer can reach hrc82 °. ■ the cutting edge will not become blunt after the discharge coating.

■ the discharge coating layer penetrates into the substrate and will not fall off. ■ easy operation and extremely low processing cost.

■ the thickness of the plating layer can be adjusted and selected by the machine. ■ the discharge coating process will not change the substrate material or deformation.