There are many forms in the production process of nodular cast iron manhole cover, which also determines the distinction between its high-quality materials and price. If the technology is good, the natural price is not the same, and the cast iron manhole cover is also different. The following editor will tell you in detail!

At present, the common polishing methods are as follows

① / electropolishing

The basic principle of electropolishing is the same as that of chemical polishing. However, compared with chemical polishing, electropolishing can eliminate the influence of cathode echo and achieve good results.

② / chemical polishing

Chemical polishing is to dissolve the micro protrusion of nodular cast iron with chemical medium, and then get a smooth product appearance. The main advantages of this method are that there is no need for messy equipment, less investment in polishing equipment, convenient operation, and the workpiece with chaotic shape can be polished.

And it can be batch polished to improve the polishing ability. The use of chemical polishing of zinc alloy products, can quickly obtain a bright surface, good corrosion resistance, easy electroplating, spraying and other processes.

③ / mechanical polishing

Mechanical polishing is a kind of polishing method to remove the micro convex part of the product surface by cutting, so as to make the product surface smooth. Mechanical polishing generally uses polishing wheel, swing grinder or other grinding equipment.

The polishing wheel is usually made of multi-layer canvas, felt or leather, and its two sides are clamped by metal circular plates. The edge of the polishing wheel is coated with polishing agent, and the polishing agent is evenly mixed with micro powder abrasive and grease. Polishing is the manual operation of die-casting products pressed on the high-speed rotating polishing wheel, so that the abrasive rolling on the surface of the workpiece.

Then get a smooth look. When using non greasy matte polishing agent, it can make the bright surface matte and improve the appearance.

At present, most factories use swing grinder to polish zinc alloy die-casting products instead of polishing wheel, which can be batch polished. The polished products have high power and high finish, saving manpower / material / financial resources.

④ / magnetic abrasive polishing

Magnetic abrasive polishing is to grind the outer surface of ductile iron with an abrasive brush under the action of magnetic field. The processing ability of magnetic abrasive polishing is high, the quality of zinc alloy die casting products is good, and the working environment is excellent.

⑤ / ultrasonic polishing

Ultrasonic polishing is the use of ultrasonic vibration to make the zinc alloy products and mold suspension in the ultrasonic field vibrate, so that the abrasive mold cutting product surface to achieve polishing effect. Moreover, ultrasonic polishing will not lead to the deformation of polished products, resulting in scrap. But ultrasonic polishing

The investment of the equipment is large and the installation is troublesome, so it is not suitable to be used alone. The combination of chemical polishing and spot solution polishing can improve the corrosion resistance of products.

The above small series will tell you something like that. Our factory creates cast iron well cover through multiple polishing technology, keeps improving in technology and wins in quality. It’s a good choice for you. We sincerely hope to reach long-term cooperation with you.