SU515801A1 - Device for thermal strengthening of sheet - Google Patents

Description

The invention relates to the field of heat treatment. According to the main author. St. No. 292505, a device for thermally hardening a sheet is known, made of a series of sections, each of which contains liquid injection nozzles and a cooling chamber, which for the purpose of uniformly distributing the cooling medium over the sheet width and controlling its cooling rate is provided with a lid hinged to it housing from the entrance of the rental. However, in order to optimally form the jet that injects the injection fluid from the nozzle, the length of the nozzle section from the point of supply of the cooling medium to its exit from the nozzle (nozzle length) should not be less than 10-15 inlet diameters. This leads to the fact that devices for heat strengthening of the sheet in the areas of coolant supply have large dimensions (up to 1.5 m before each section). The purpose of the invention is to reduce the size. non-ejector nozzles. This is achieved by the fact that each injection nozzle is made in the form of a cochlea with a uniformly decreasing cross-sectional area of its channel, the length of which is set equal to preferably 10-15 diameters of the coolant supply. FIG. 1 shows the proposed device, top view; in fig. 2 - section A-A of FIG. 1. 1 Nozzles are made in the form of a cochlea with case If with coolant inlets 2 and 3 displaced from each other, preferably by half the diameter of one inlet and output nozzle 4, which in cross section can be made narrowing towards the center. The inner channel 5 of the cochlea has a length of up to 10-15 diameters of the coolant supply and uniformly reduces the section to the exit nozzle. The device works as follows.

Cooling medium through inlets 2 and 3 is fed to the injection nozzle. Fluid flows due to the displacement of the supply pipes by half the diameter ensure uniform distribution of the medium pressure inside the nozzle, and further averaging of the flow across the width occurs in a uniformly narrowing channel, the length of which is equal to 10 -15 diameters of the supply.

Fog.1ula of the invention. A device for thermally hardening a sheet according to ed. St. No. 292505, characterized in that, in order to reduce the dimensions of the liquid injection nozzle, the nozzle is designed as a cochlea with a uniformly decreasing cross-sectional area of its channel, the length of which is 10-15 diameters of the coolant supply.

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