SU1400785A1 - Method of producing metallic powder - Google Patents

Abstract

The invention relates to the field of powder metallurgy, in particular, to a method for producing powder by mechanical grinding of metal chips. The aim of the invention is to reduce energy consumption and increase productivity. The chips are loaded into the grinding chamber and crushed, affecting its layer by compressive deformation with a simultaneous shift, for which the grinding body is given a variable amplitude along the chamber that increases from loading to unloading zone, and at the moment of divergence of the body, the chip layer is forcibly moved to the discharge zone. 3 il. (L

Description

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The invention relates to powder metallurgy, in particular, to a process for the production of powder from chipping steel and alloys.

The purpose of the invention is to reduce energy consumption and increase productivity.

FIG. 1 shows a scheme for implementing the method in a device with grooved flat grinding surfaces equipped with self-balancing vibrators; Fig. 2 is a diagram of the method implementation in a device with cone-shaped smooth surfaces; in fig. 3 is a scheme for implementing the method in a device with a cylindrical outer and cone-shaped inner corrugated grinding surfaces.

The method can be implemented according to any given (Fig. 1-3) scheme. Due to their kinematics and dynamics, each of these devices provides the amplitude from loading to unloading along the chamber length, as well as the forced movement of the chip mass due to its inertia in the same direction.

Example I.Ha device with grooved planes of grinding surfaces, equipped with self-balancing vibrators and two 5.5 kW electric motors, crushes iron-cobalt and copper chips. The loading of the device is carried out under the pressure of the mass of the starting material up to 0.4 t / m. The interaction of the grinding surfaces with a length of 500 mm is carried out with a frequency of 30 Hz and an amplitude from 0 (in the loading zone) to 30 mm (in the discharge zone). The forced movement along the chamber is carried out due to the moment of inertia of the chip mass at the moment of divergence of the milder surfaces with simultaneous movement of kx in the direction of loading. Capacity up to 1 ton of coarse powder (up to 5 mm) per hour.

The unit cost of electricity is 9 kWh / t compared to 12 kWh / t for a known method (performance of the known method is 0.7 t / h).

Example 2. On a device with cone-shaped smooth surfaces, equipped with self-balancing vibrators with motors with a power of 7 kW each, the same crust is crushed as in example 1 at a frequency of

25 Hz. With a cavity length of 420 mm, the amplitude directed to the compression of the layer varies from 6 to 12 mm (from the top to the bottom of the cavity). The forced movement of chips along the cavity is created due to its shape along the height of the cavity, taking into account the moment of inertia of the chips.

Productivity is 0.8 t / h with a fineness of powder smaller than 5 mm. Click here. The net power consumption is 11 kWh / t instead of 12 kWh / t in the known method (the productivity of the known method is 0.7 t / h).

Example Z. In a device with a cylindrical outer and cone-shaped inner grooved grinding surfaces, the shaft of which is hinged on one side in the deaf end of the body, and on the other hand enters the bearing with a vibrator driven by a 7 kW electric motor , that in example 1. The interaction of grinding surfaces with a length of 500 mm is carried out with a frequency of 2 H Hz and an amplitude from 0 (in the loading section) to 16 mm (in the discharge zone). The forced movement of the chips along the chamber is carried out due to the material in the loading zone and the moment of inertia of the mass of the discharge discharge gap formed between the outer and inner grinding surfaces at the moment of their divergence. The method provides performance up to 0.9 t / h of coarse powder (smaller than 5 mm). The unit cost of electricity is 10 kWh / t instead of 12 kWh / t for a known method (performance of the known method is 0.7 t / h)

Thus, the application of the proposed method provides a reduction in energy intensity and an increase in productivity.

Claims (1)

Invention Formula The method of obtaining metal powder, mainly from metal chips, includes loading the source material into the chamber with grinding bodies and mechanical grinding when applying vibrational vibrations with the grinding material moving through the chamber, so that to reduce energy intensity 3, U00785 and increasing productivity, moving the material with an amplitude, vibrational vibrations overflow from the loading zone .k with the camera discharge zone changing along the direction.  0 / ° o / ° o / o / o o / o o / o o / o 7 o 7 7 / o / e C) and 2.1 o / o / o o / o o / o o / o 7 o 7 7 / FIG. 2 YY)