SU1553167A1 - Laboratory ball mill for fine milling - Google Patents

Abstract

The invention relates to the technique of fine grinding by the dry method, in particular to ball mills, and may find application in the grinding of powders of metals and their alloys. The purpose of the invention is to increase the grinding efficiency. The laboratory ball mill contains a vertical chamber 1 with grinding bodies, a working body 2 with blades 3, the gaps between which must be less than 1.8 and greater than 1.2 diameters of the grinding body. The same condition must be observed with radial gaps between the blades 3 and the wall of the mill housing and with the gap between the lid and the blades. 1 hp f-ly, 4 ill.

Description

FIG. one

Selection refers to the technique of dry-grinding of various materials, such as metal powders and their alloys.

The purpose of the invention is to increase the grinding efficiency.

FIG. 1 is a diagram of a laboratory ball mill, FIG. 2 is the same longitudinal section, FIG. 3 is a cross section A-A in FIG. 2, FIG. 4 is a section B of FIG. 3 (blades of the impactor)

The laboratory ball mill contains a vertical chamber 1 with grinding bodies, a working body 2, on the vertical shaft of which the blades 3 are fastened, and a cover 4, which is attached to the body by bolts. and the shape of the shaft makes it possible to fasten it to the chuck of an electric motor, for example, a drilling machine

Fig. 2 shows a three-dimensional working body 2, each of its rows (a set of instruments that are in the same horizontal plane) consists of three blades, 3, swings also distances 1 ,, 1g, 13 and L, and an angle of 45 °

The laboratory mill is designed for grinding solid materials, such as, for example, alloys of Al, Nil, Mo, Cr, Ti, etc., as well as for the mechanical activation of solid-state reactions involving the powders of these metals (tribosynthesis)

In the mill chamber with an internal diameter of Df 5 () mm is inserted a working body of variable diameter with different sizes.

0

0

five

0

gaps b, b, b, 14 At 3/4 of the mill volume steel balls with a diameter of 9 mm are filled up. Then 10 g of alloy NI - 50% A1 of fraction 0.4-0.6 mm is filled up. The mill is covered with a lid and secured on a drilling machine.

The table shows the content of the fraction of 5–8 µm in the milling products (determined on a Culter-Cunter-TA-P instrument) depending on the parameters of the mill after 10 minutes of grinding at a rotor speed of 1500

The table confirms the optimality of the selected mill parameters.

Claims (1)

Invention Formula 1 Laboratory ball mill for fine grinding, containing a vertical working chamber with grinding bodies, a working body placed in the chamber, on the vertical shaft of which blades are fixed, extending in the direction from the axis to the periphery, characterized in that, in order to increase the grinding efficiency, the blades arranged in horizontal rows, with vertical gaps between the rows of blades, the upper row and the lid of the chamber, the radial clearance between the blades of the agitator and the wall of the chamber, as well as the gap between adjacent lobes E in one row is 1,2- 1,8 grinding body diameter 2. A mill according to claim 1, characterized in that the planes of the shock surfaces of the blades are formed with a plane normal to the axis of the working member, an angle of 30-45 ° The effect of the parameters of the laboratory mill on the grinding efficiency of the Ni – 50% Al alloy. 30999 451099 2591010 5091010 35799 35977 3591111 3591515 351299 four i Fig 2. Fig.Z Fy