Manufacturing process of diamond wire saw for cutting concrete
The manufacturing process of diamond wire saw for cutting concrete mainly includes: cleaning of wire rope, preparation of diamond beads, forming or assembling of fixed sleeve and cutting edge, etc.
Cold Forming of Wire Saw Beads
The cold pressing of powder is to process the loose powder body into crushing with a certain size, shape, and certain density and strength. Cold pressing generally includes ordinary molding methods and special molding methods. The former is to put metal powder or other mixed powder in a specific die and press it into a press; the latter refers to non-compression molding, such as static pressure molding, continuous molding, pressureless molding, etc. Before cold pressing, it is usually necessary to prepare raw materials, such as annealing, mixing of various element powders, granulation and adding lubricants.
Cold-pressing molding process of metal powder: When a certain pressure is applied to the powder in the die, the powder particles will move relative to each other, and the powder particles will fill the pores to reduce the volume of the powder body. At the same time, after the powder particles are compressed, To withstand different degrees of elastic deformation and plastic deformation, there is a certain bond between the particles, so that the crush has a certain strength. In addition, due to the large internal stress accumulated in the compact during the pressing process, when the pressure is released, the compact will expand (elastic after-effect). Take out from the mold to complete the powder cold pressing process. Cold pressing means that after the loose powder is subjected to a certain pressing pressure in the die, the relative displacement between the powder particles occurs, the pores are filled, the powder volume is reduced, and the density is increased, becoming a powder with a certain size and shape and a certain density and strength. The process of compaction.
Cold pressing of beads for cutting concrete
There are two common methods for cold pressing of beads for cutting concrete:
One is to use split cold pressing, that is, after pressing the powder of the working layer into a cylindrical shape, the mold is unloaded. The steel matrix is put into the sintering mold together with the cold compact for sintering before sintering. The most prominent problem of this method is that during the sintering process, the air existing between the cold pressing and the steel matrix cannot be exhausted, and the bonding strength between the working layer matrix and the steel matrix after sintering is low.
The second is the use of integral cold pressing, that is, the powder of the working layer and the steel matrix are cold-pressed at one time. This method has the characteristics of convenient loading, assembly and mold removal, high yield of cold-pressed blanks and high production efficiency.
Cold forming process of diamond wire saw beads
Since the beads are thin-walled and long, and the hardness of the diamond is much greater than that of the mold, the ordinary cold press has a high pressing speed. If the pressing resistance is too high, it is easy to cause serious uneven density of the cold compact, cracks and breakage of the compact, and rapid wear of the cold pressing die. The cold pressing process of “fast forward – slow pressing – holding pressure – slow backward – fast backward” should be used to control the pressing speed.
Beading of diamond wire saws
The beads of the diamond wire saw must be fixed by the fixing material to achieve cutting. Due to the different fixing materials used, the fixing techniques are also different. The fixation of diamond wire saw beads means that after the beads are electrically connected by a wire rope of a certain length, the beads are arranged at regular intervals through certain fixing means (injection molding, glue injection, spring, etc.), and during the sawing process It plays the role of supporting and fixing the beads, storing water and containing chips, and making the beads form a tool with cutting ability. Another very important function of the use of injection-molded plastic (or rubber, elastic) in the wire saw is to prevent the beads from rotating around the wire rope.
In addition to the functions of connecting the beads through the wire rope into a whole, entraining the flushing liquid (cooling), and removing chips, the fixing material must also bear high-frequency impact loads, prevent the beads from moving axially and rotate around their own axes, corrosion-resistant, resistant to Wear, aging resistance and other functions; at the same time, the fixing material itself must also have the characteristics of good elasticity, easy molding and high strength. As a single use of spring fixation (mainly used for marble mining), the spring is required to have good stiffness and wear resistance, especially for the fatigue strength of the spring, which can withstand millions of times of compression and tension.