SU759233A1 - Furnace for heat treating of ferrite articles - Google Patents

Description

The invention relates to powder metallurgy, in particular to devices for heat treatment of ferrites, widely used in radio engineering and electronic computing.

Known furnace for heat treatment of ferrite products, including a high-temperature chamber with a channel IE of heat-resistant material, a conveyor belt, drive, loading and unloading devices, clips and traction connected to the clips [1]. The furnace provides forced sintering of small-sized ferrite microcores.

This furnace is the closest to the invention in terms of technical nature and the achieved effect.

However, it does not allow forced sintering of large-sized ferrite products, and the resulting products have low reproducibility of parameters.

The aim of the invention is to increase the productivity of the process and ensure the stability of product parameters.

This goal is achieved by the fact that the furnace is equipped with vertical heat pipes, screens and additional high-temperature chambers, a conveyor belt and a drive, the heat pipes being placed between ⁵ cameras, the screens are made in the form of a set of plates made of heat-resistant material and mounted in heat pipes, and the plates are arranged in clips with the ability to move in a direction perpendicular to the longitudinal ^{, 0} axis of the furnace.

This design of the furnace allows the preliminary heat treatment of the workpieces in the upper chamber, followed by high-temperature heat treatment in the lower chamber. The temperature in the upper chamber is controlled by moving the elements of the heat shields located in the vertical heat pipes between the chambers. This ensures forced drying and sintering of large-sized ferrite products in one furnace, under identical temperature conditions.

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In FIG. 1 schematically shows a furnace, a General view; in FIG. 2 - section aa in figure 1.

The furnace consists of a lower high-temperature chamber 1 and an upper chamber 2 with channels 3, 4 of heat-resistant material. Conveyor belts 5 and 6 are located inside the $ channels. Between the high-temperature chambers 1 and 2 there are multilayer heat shields 7 located in vertical heat pipes 8. The screens 7 are made in the form of a set of plates 9 made of heat-resistant material located in clips 10 with the possibility of movement by means of rods 11 independently from each other in a direction perpendicular to the longitudinal axis of the furnace. Belt conveyors and yers 5 and 6 are driven by electric motors 12 and 13, conveyor speed is controlled by voltage regulators 14 and 15 and gears 16 and 17, the drive sprockets of which 18 and 19 are connected to driven sprockets 20 and 21, mounted on shafts clutches 22 and 23. The furnace has loading devices 24. and 25 and unloading 26 and 27, as well as cuvette 28 for products, thermocouples 29.

The operation of the furnace is as follows.

Products prepared for heat treatment ₍ loaded into cuvettes 28 and placed through loading device 24 onto a tape cone all over 6. The cuvettes with products pass through heating, drying and move to the discharge device 26 along the channel 3 of the chamber 2. As they are unloaded from the device 26, the cuvettes are placed through the loading device ₃₅ на 25 onto the conveyor belt 5. The cuvettes with the products pass through heating, firing and hardening along the channel 4 of the chamber 4 and enter the unloading device 27. Heating, quenching, drying time and firing are regulated by changing the speed of the conveyor belts 5 and 6. The drying, firing and hardening temperatures in the chambers 1 are controlled by thermocouples 29 and are determined by the brand and size of the ferrite products.

The proposed furnace for heat treatment of ferrites was tested during firing of Νϊ-Ζ η ferrites.

In comparative firing of products of the brand 600НН with a size of 2.8 x 14.0 mm 'in the known and proposed furnaces, the following data were obtained (in brackets for the known furnace) drying time - 30 min at 600 ° C, firing time 30 min (1.5 h) at 1150 (980 ° C, yield 85 (45)%. '

Thus, the use of the proposed furnace for heat treatment of ferrites reduces the time of firing products, increases the reproducibility of product parameters, which leads to an increase in labor productivity of ferrite production.

Claims (1)

Formulas! " inventions A furnace for heat treatment of ferrite products, including a high-temperature chamber with a channel made of heat-resistant material, a conveyor belt, a drive, loading and unloading devices, clips and aunts connected with clips, characterized in that, in order to increase the productivity of the process and ensure the stability of the parameters of the products, it is equipped with vertical heat pipes, screens and additional high-temperature chamber, belt conveyor and drive, Moreover, the heat pipes are placed between the cameras, the screens are made in the form a set of plates of heat-resistant material and mounted in heat pipes, and the plates are arranged in cages with the possibility of movement in a direction perpendicular to the longitudinal axis of the furnace.