How do the circular knives manufacturers choose the coating?

The reason why the circular knife blade should be coated on the surface is to protect the circular knife blade, so as to reduce the loss formed during the use or placement of the circular knife blade. With the change of market demand, consumers have higher requirements for materials and more consideration for cost performance. Therefore, in order to better meet the market demand, manufacturers often choose composite materials, such as aluminum, chromium, silicon, etc., so that their cutting tools can achieve higher performance. This article will reveal the concerns of circular knife blade manufacturers in choosing circular knife blade coating.

The following is a list of contents

1. The hardness of circular knife blade coating

2. Wear resistance of circular knife blade coating

3. Surface lubricity of circular knife blade coating

4. Oxidation temperature of circular knife blade coating

The hardness of circular knife blade coating

The high surface hardness brought by coating is one of the best ways to improve the tool life. Generally speaking, the higher the hardness of the material or surface, the longer the service life of the tool. Titanium nitride carbide (TiCN) coating has a higher hardness than titanium nitride (TIN) coating. Due to the increase of carbon content, the hardness of TiCN coating is increased by 33%, and its hardness variation range is about hv3000 ~ 4000, which depends on the manufacturer. Compared with PVD-coated tools, the service life of CVD diamond-coated tools is increased by 10 ~ 20 times. The high hardness and cutting speed of diamond coating is 2 ~ 3 times higher than that of uncoated tools, which makes it a good choice for cutting non-ferrous materials.

Wear resistance of circular knife blade coating

The wear resistance of the circular knife blade refers to the ability of the coating to resist wear. Although the hardness of some workpiece materials may not be too high, the elements added and the process adopted in the production process may cause the cutting edge of the tool to crack or blunt.

Surface lubricity of circular knife blade coating

High friction coefficient will increase cutting heat, resulting in shortening or even failure of coating life, and reducing friction coefficient can greatly prolong tool life. A fine, smooth or regular coated surface helps to reduce the cutting heat because a smooth surface can quickly slide the chips away from the rake face and reduce the generation of heat.

Oxidation temperature of circular knife blade coating

The oxidation temperature of the coating refers to the temperature value when the coating begins to decompose. The higher the oxidation temperature, the more favorable it is for cutting at a high temperature. The reason why TiAlN coating can maintain its hardness at high temperature is that a layer of alumina can be formed between the tool and the chip, which can transfer heat from the tool to the workpiece or chip. Compared with high-speed steel tools, the cutting speed of cemented carbide tools is usually higher, which makes TiAlN the preferred coating for cemented carbide tools. This PVD TiAlN coating is usually used for cemented carbide drill bits and end mills.

Adhesion resistance of circular knife blade coating

The anti-adhesion of the coating can prevent or reduce the chemical reaction between the tool and the processed material and avoid the deposition of workpiece material on the tool. When machining non-ferrous metals (such as aluminum, brass, etc.), chip buildup often occurs on the tool, resulting in tool edge collapse or workpiece size out of tolerance. Once the processed material begins to adhere to the tool, the adhesion will continue to expand. When processing aluminum workpiece with forming tap, the aluminum adhered to the tap will increase after processing each hole, and finally, tap diameter will become too large, resulting in the over tolerance of workpiece size and scrapping.

The above is a brief introduction of the key points considered by the circular knife blade manufacturer when selecting the circular knife blade coating. In the process of purchasing the circular knife blade, buyers can also understand the coating of the circular knife blade produced by the manufacturer, which can help buyers master the quality of the circular knife blade to a great extent. Maanshan King knife Machinery Co., Ltd is an enterprise integrating the production and sales of circular knife blades. The company produces various types of circular knife blades, which can meet the needs of most machinery production in the market. Our products are made of high-quality raw materials with guaranteed quality. If you are interested in our products, please contact us as soon as possible to obtain a quotation!