SU501996A1 - The method of manufacturing products having the form of bodies of rotation - Google Patents

Description

The invention relates to the manufacture of ceramic products having the form of rotation bodies — rings, washers, disks, and can be used in the manufacture of densely sintered ceramic parts for the electronic, radio, and electrical industries.

Various methods are known for making ceramic parts by molding and high-temperature calcination.

However, these methods have a number of disadvantages:

The firing of molded parts in tunnel (conveyor) furnaces on moving boats or trolleys is accompanied by a noticeable deformation of the parts, due to which it is necessary to give large allowances for grinding parts;

-application of supports - BOMd for parts increases the consumption of the molding material per unit of product and does not exclude the appearance of deformation;

- firing of the closely-packed parts with a column to reduce their deformation is in many cases unacceptable due to sintering of the parts to each other iodine by the action of gravity.

The purpose of the invention is to reduce the deformation of the workpieces and increase productivity.

To this end, it has been proposed to conduct heat treatment of hollow blanks in a rotary kiln with simultaneous application of an axial load. In addition, in order to prevent baking of the blanks, a load is applied intermittently to each other, and a cylindrical liner of a refractory metal is placed in the cavity of the blanks.

The proposed method molded and

Parts subjected to scrap roasting — washers, discs, rings — are burned in position on the generator, giving them a rotational-translational motion in the furnace channel. To do this, the parts are placed in a rotational tube and a longitudinal, axial load is applied to them, ensuring the advancement of the parts and their leveling along the plane. Loading the parts one by one, fill the entire bore of the furnace by performing continuous conveyor firing.

Rotational movement causes the parts to move one relative to another in a vertical plane (due to the different coefficient of friction between parts along the length of the furnace channel and lifting and subsequent rolling of parts along the wall of the rotating pipe), which reduces the likelihood of their burning to each other. When sintering parts from masses containing

increased amount of glass phase, axial

load can be applied continuously. In this case, due to the shrinkage between the parts, a selected gap is formed, which facilitates the mutual movement of the parts in a vertical plane. When firing rings for increased dimensional accuracy, a rod - liner of refractory material, such as tungsten, molybdenum or alumina, can be placed in the hole of the additional polio rings. Due to the rolling of the liner, the detailing of the parts and the internal diameter also occurs. In this case, the axial longitudinal load can be significantly reduced, since the inner liner prevents the articles from tilting.

Cassette loading and unloading parts can be used to automate production.

The use of the described method reduces the scrap on deformation and significantly reduces the allowances for grinding, increases the productivity of labor and reduces the cost of products.

Claims (3)

1. A method of manufacturing products having the form of rotation bodies by molding and heat treating hollow blanks while simultaneously rotating them, characterized in that, in order to reduce deformation and increase productivity, heat treatment of the blanks is carried out with simultaneous application of an axial load. 2. A method according to claim 1, characterized in that, in order to prevent the workpieces from baking to one another, the load is applied intermittently. 3. Method according to paragraphs. 1 and 2, characterized in that a cylindrical liner of refractory material is placed in the cavity of the blanks.