How to choose a tungsten carbide bur?
1. Know the shapes and types of burrs
Carbide burrs are made of tungsten carbide material. Commonly used for a variety of job requirements, such as machining cast iron, cast steel, carbon steel, alloy steel, stainless steel, hardened steel, copper and aluminum.
2. International Standard Shape Classification
Generally, it can be divided into 19 shapes, the most commonly used are cylindrical, spherical, flame head shape, etc. In China, each shape is directly represented by letters such as A, B, and C, and abroad is usually referred to as the letters ZYA, KUD, RBF, etc.
Of course, there are also five-tooth shapes specially used in the high-speed rail industry.
3. Tooth classification and application
Generally, single-edged toothed rotary burrs are more suitable for processing operations such as soft non-ferrous metals, plastics, soft high tensile steel, or hardwood, while cross tooth patterns are more suitable for high cutting performance on hard materials. Such as the grinding of workpieces made of cast iron, cast steel, and glass fiber plastic materials.
For each shape of the rotary burr, the tooth shape of the blade teeth can be selected according to the specific operational requirements. Generally, the international standard tooth shape can refer to the following six types:
a. Aluminum tooth pattern - especially suitable for soft metals such as aluminum alloy, brass, magnesium, etc., because of its wide tooth spacing, it is conducive to fast and clear-cutting;
b. Coarse serration pattern - soft materials such as bronze, tin, zinc, pure copper, and other easy-to-machine materials are recommended;
c. Medium tooth pattern/standard tooth pattern - suitable for processing all kinds of steel (including tempered steel), cast steel, and almost all metal materials. The surface machining quality of this tooth profile is excellent, and the machining efficiency is relatively high.
d. Rhombic tooth pattern - this tooth shape is suitable for the processing of high alloy steel, stainless steel, magnesium alloy, gray cast iron, and zirconium-nickel steel, and can effectively avoid the unfavorable phenomenon caused by the crushing of chips during operation;
e. Dense tooth pattern - suitable for finishing and other processing operations that require high surface quality, specially tempered steel with a Rockwell hardness (HRC) below 66;
f. Cross tooth pattern - This tooth shape is suitable for all kinds of metal materials (including tempered steel and corrosion-resistant materials), and the vibration during processing is small and easy to control operation.
There is also a chip-breaking tooth pattern, which is selected on the basis of a single-tooth file, which can be used to process materials with long chips and can be applied to the above a/b/c/e burrs.
Tungsten Carbide Rotary Burr coating: Generally speaking, there are no special requirements, and the rotary file has no coating treatment. Coating is required unless special operations require it. Then the rotary file with the coating treatment can mainly prolong the service life of the tool, improve the cutting chip removal condition, have better heat resistance and anti-adhesion characteristics, and enhance the cutting force.
Correct Operation Method of Carbide Rotary Burr:
1. Before operation, please read the operating speed and select the appropriate speed range. Low speeds will affect product life and surface finish, as well as product chip evacuation, mechanical chatter, and premature product wear.
2. Select the appropriate shape, diameter, and tooth profile for different machining.
3. Choose a suitable electric grinder with stable cutting performance.
4. The length of the exposed part of the shank clamped in the collet is at most 10mm (except for the extended shank, the rotation speed is different).
5. Idling before use to ensure good concentricity of the rotary file. Eccentricity and vibration will cause premature wear and workpiece damage.
6. It is not advisable to use too much pressure during use, since it will reduce the life and efficiency of the tool.
7. Check that the workpiece and the electric grinder are properly and precisely clamped before use.
8. Wear suitable safety glasses when in use.
