SU1764812A1 - Method and apparatus for production of fibers - Google Patents

Description

one

(21) 4268738/02

(22) 07.15.87

(46) 09/30/92. Bul Number 36

(71) Belarusian Polytechnic Institute

(72) A.8. Stepaneiko, V.G. Voitov, A.E. Kamcevi A.V. Zverev

(56) USSR Author's Certificate No. 1138247, cl. B 22 F3 / 18, 1982.

USSR Author's Certificate No. 1699715, cl. In 22 F 3/18, 1987.

(54) FIBER MANUFACTURING METHOD AND DEVICE FOR ITS IMPLEMENTATION

(57) The invention relates to powder metallurgy, in particular to the manufacture of metal fibers. The purpose of the invention is to increase the yield. Spherical powder particles are fed between rollers 1 and 2 (or roller 1 and belt 3). The rolls rotate in one direction, but at different speeds. Due to the fact that the deforming force is determined by the magnitude of the deflection of the wall of a thin-walled roll and its stiffness, the pressure decreases, since the size of the contact pad increases and the particle is in a more favorable deformation state. In addition, due to the absence of a gap between the rollers, the possibility of the passage of the untreated particles through the treatment zone is eliminated and thereby the clogging of the obtained fibers is reduced. 2 sec. and 2 Cp. f-crystals, 4 ill., 1 tab.

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The invention relates to powder metallurgy, in particular to the manufacture of metal fibers,

The aim of the invention is to increase the yield.

Figure 1 shows a diagram with convex and thin-walled cylindrical rollers; figure 2 - section aa in figure 1; Fig. 3 is a diagram with a convex roller and an endless moving metal band; figure 4 - section bb in fig.Z.

The device for making fibers contains a rigid deforming convex roller 1 and a thin-walled roller 2 or a metal tape 3c, which guides its movement by rollers 4; 5 and 6 are rolls driving drives. The rolls are installed without a gap between their working surfaces, and the drives 5 and b of their rotation provide the possibility of their rotation in the same direction with different linear speeds.

The method is carried out as follows.

Spherical powder particles are fed between rollers 1 and 2 (or roller 1 and belt 3). The rolls rotate in one direction, but at different speeds. Due to the mismatch of the velocities, the particle is drawn into the deformation zone and receives a rotational motion. The number of run-ins of a deformable particle depends on the degree of mismatch of the peripheral speeds of the rolls. Because of times

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the line of circumferential speeds of the rolls acting on the length of the fiber, when it is rolled, its transverse layers shift (twist), which reduces the force of deformation. Due to the curvature of the deforming roller in the process of rolling the fiber, it cyclically bends, also leading to a decrease in deforming forces. Due to the fact that the deforming force is determined by the amount of deflection of the wall of a thin-walled roll and its stiffness, the pressure exerted by the tool on the fiber during the running-in process is reduced, since the magnitude of the contact area increases. Thus, the particle is in a more favorable deformation state. In addition, due to the absence of a gap between the rollers, the possibility of the passage of the untreated particles through the treatment zone is eliminated and thus the clogging of the fibers obtained is reduced.

An exemplary embodiment of the method performed on the device shown in Figures 1 and 2.

The particles of powders of various materials of the spherical form of the fraction - 0.315 + 0.160 are passed between the rolls with a length of 200 mm. The radius of curvature of the convex roll is 250 mm. The wall thickness of the hollow roll is 1 mm. The speed of rotation of the convex roll is 250 rpm, the speed of rotation of the thin-walled roll is 200 rpm.

Powders of the same materials of the -0.20-0.16 fraction were rolled on the prototype device. Undeformed particles were separated from the fibers by sieving on the screens.

By weighing determine the percentage of marriage. The data obtained are tabulated.

Analysis of the data presented shows that on the proposed device, the yield of suitable fibers is 8 ... 10% higher than that on the prototype device. In addition, the proposed technical solution allows processing of wider fractions of powders, which reduces the cost of the process due to the absence of the need to separate a narrow fraction of powders.

Claims (4)

1. A method of making fibers, comprising deforming spherical powder particles by rolling between two working surfaces, shifting by twisting the transverse layers of the formed fibers and their cyclic bending, characterized in that, in order to increase the yield, the deformation of the fibers is carried out with constant force. 2. A fiber manufacturing device comprising deforming elements with rotational drives, one of the deforming elements is made with a convex working surface, characterized in that, in order to increase the yield of the second, the deforming element is made with elastic walls, and the deforming elements are installed with contact on the working surface. 3. The device according to claim 2, characterized in that the second deforming element is made in the form of a hollow roll. 4. The device according to claim 2, characterized in that the second deforming element is designed as an endless moving belt. R il 1 Fig.Z FIG L