A perfectly finished job is the goal of every professional. An unpolished finish, a polished surface, well treated and equipped with all the necessary tools are the basic requirements for this. However, to achieve this it is necessary to know what elements we can use and to know how to distinguish which elements are more suitable for each occasion.
At Hebei Machinery, we want to help you as much as we can, providing you with all the products you need and the highest quality assurance. In addition, we will accompany you throughout the process, guiding and advising you on the most suitable method for each of your projects. So, this time we will explain everything about abrasive discs: what they are, the different types, and their characteristics ......
With this information, you will know exactly what you need when it comes to choosing the right abrasive discs. So, read on!
An abrasive disc is a basic component that enables the use of fixed or portable tools and helps us to cut, rough or sand any material by friction. Its design, shape, and composition will vary depending on the application for which it will be used.
Generally, its composition is based on a series of crushed abrasive particles, joined together by an adhesive, anchored, and fixed to the supporting material. These particles can be made from natural or synthetic alumina, silicon carbide, zirconium, ceramics, or diamond.
Abrasive discs are used in a wide range of applications in the secondary steel industry: from the manufacture of shipbuilding and household appliances, parts for the automotive and construction industries, special profiles, pipes, and appliances to the maintenance and repair of equipment, tools, and machinery.
Abrasive discs are an essential component for grinding any material using machine tools.
The cutting process is one of the most common processes used in the metal industry. Abrasive cutting wheels are the most common, versatile, comfortable, and inexpensive.
The main factors to be considered in this operation are the thickness of the cutting disc, the thickness of the material to be cut, the substrate to be cut, the power of the machine, the pressure applied, and the heat provided.
Depending on the material from which the discs are made, we can find two categories.
Conventional: from aluminum oxide, silicon carbide, or a mixture of aluminum oxide and zirconium. They are ideal for working with soft, hard and semi-hard materials. They are used for cutting, roughing and polishing steel, cast iron, ceramics, and copper ......
Superabrasives: in this block are included abrasive discs where more intense cuts must be made. They are specially designed for cutting and roughing very hard materials at high speeds and in a very precise manner.
Depending on the shape of the grinding wheel, we can classify them as
Flat cutting discs: they are used for cutting. The diameter varies between 75 and 400 mm for portable machines and between 300 and 400 mm for stationary machines.
Concave discs (central depressions): they are used for cutting and vary between 75 and 250 mm in diameter for roughing, with a thickness range of 2 to 10 mm and a diameter of 75 to 250 mm for portable machines
The roughing process consists of removing excess material from the workpiece to obtain the desired shape and size. The main objective is to remove as much material as possible in the shortest possible time, regardless of the finish we want to obtain.
We must take into account the factors that may affect the performance of the disc: the heat generated, the pressure exerted by the disc on the workpiece, the working speed and the projection of the remaining ore in the block.
Abrasive discs also differ in terms of mounting and special features. For example, hook and loop mounting attaches the abrasive using a hook and loop fabric whereas bore or center mounting use a central hole through which the disc attaches to the integral mandrel, arbor, spindle, or shaft. Other types of mounting include quick change and PSA/adhesive. In terms of features, abrasive discs may use an open or closed coat, metal bond, or disc roll.
Inside the abrasive discs, we find.
Louvered discs, designed for roughing, offer excellent performance where finishing is important. These sandpaper discs are made of abrasive cloth and fiber sheets. They are available in various forms, abrasive minerals and special coatings to suit every application.
When speed is the decisive factor in roughing, we will use fiber discs for roughing flat parts. They achieve a greater degree of material removal during roughing and deburring operations. A wide range of diameters, minerals, and grains are available on the market.
Finally, we must consider n woven discs to eliminate stainless steel welds. Their high cutting power allows them to eliminate welds while leaving a very fine surface finish, thus reducing the number of subsequent steps until the final surface finish of the workpiece.
They have an open three-dimensional fabric structure for fast cutting, keeping the surface cool and free of embossing. They help to remove rust, weld spatter, scale, and other surface contaminants.
The sanding process includes surface smoothing and refining operations using abrasives, including wood, metal, plastic, glass, composites, varnish etc. ......
In several passes, using finer particles each time, we can obtain a homogeneous surface with different finishes. Usually, this sanding is done using rotary orbital machines which have a suction system and use discs with a varying number of holes in the surface.
At Hebei Machinery, we have the best quality abrasive discs and other materials and solutions for professional surface sanding. Do not hesitate to contact us if you have any questions or needs.