SU750238A1 - Plant for chemical-thermic treating by glow discharge - Google Patents

Description

(54) INSTALLATION FOR CHEMICAL-THERMAL TREATMENT BY GLUE DISCHARGE

one

The invention relates to electrical engineering, in particular electrothermal, in particular to electrothermal installations using a glow discharge for chemical-thermal treatment of products, for example, nitriding, cementing, etc., as well as for the application of reinforcing coatings in machine-tool, machine-building, metallurgical and other industries.

A known device for continuous chemical heat treatment with a glow discharge, comprising preheating chambers, chemical heat treatment and unloading chambers, a transfer mechanism and a moving device 1.

The disadvantages of the design are insufficient productivity due to the duration of the process caused by the need to cool the products in the chemical-heat treatment chamber before unloading them, the instability of the processing results, since each new batch of products is processed under conditions different from the previous batch that em on the quality of finished products and reduces the percentage of yield of products.

The purpose of the invention is to increase productivity and improve product quality.

This goal is achieved by supplying the installation with a loading chamber connected to the preheating chamber and installed between the preheating chambers and the chemical heat treatment chamber, the ion cleaning chamber and the cooler located between the chemical heat treatment and discharge chambers,

10 of this loading and ion cleaning chamber and the refrigerator have a moving mechanism; the device for movement is made in the form of a pallet with a rack and a suspension mounted on it, on which are placed trolls interacting with one of the poles of the power supply source, ion cleaning and chemical heat treatment chambers; the device for movement is made in the form of a container and a lid with a suspension bracket fixed on it and a contact interacting with one of the poles of the power source of the ion-cleaning and chemical-thermal treatment chambers.

Claims (3)

FIG. Figure 1 shows the continuous chemical installation in FIG. 2 shows glow treatment of section A-A in FIG. one; in fig. 3 - an embodiment of the pallet. The continuous glow chemical treatment unit consists of consecutive loading chambers, pre-heating chambers 2, ion cleaning chambers 3, chemical heat chambers 4 with refrigeration meter 5, discharge chambers 6, all chambers separated by process gates 7, they are connected by a device 8 for transporting articles 9, including pushers 10 and a moving device. Each chamber is equipped with an autonomous evacuation system 11, and the ion cleaning chambers 3 and 4 heat treatment plants have power supply sources 12 and a gas supply system 13. The moving device is made in the form of a container 14 and a lid 15 with a contact 16 fixed on it, which interacts with one of the poles of the power supply 12 via a current lead 17. The moving device can also be made in the form of a pallet 18 with a stand 19 on which the suspension 20 is fixed and trolls 21, interacting with the current lead 17. Suspension 20 is electrically insulated from the rack 19 with the help of dielectric 22. The installation works as follows. The product 9 is fixed in the lid 15 of the container 14, which is loaded into the loading chamber 1. Upon completion of loading, chamber 1 is evacuated to a pressure corresponding to the working pressure of the preheating chamber 2, which is, for example, an electric resistance furnace and is at a temperature of 600-1000 ° C and vacuum up to NO mm Hg. Art. When moving the product 9 from the loading chamber 1 to the preheating chamber 2, the process shutter 7 opens. At the end of the overload, the shutter 7 is closed, the product 9 is heated and vacuum cleaning of its surface occurs, and air is fed into the loading chambers 1 and the next is loaded. When the vacuum cleaner of the product 9 is completed, the technological shutter 7 between chambers 2 and 3 is opened and the transport device 8 is moved by the corresponding pushers 10 into ion cleaning 3, while the cover 15 is suspended from the current lead 17 connected to the minus of the power source 12, and the container 14 is lowered down by the mechanism 23, forming a gap between the lid 15 and the container 14, and is connected through the housing of the installation with the plus of the power supply 12. The technological shutter 7 is closed and in the chamber ion cleaning of the products 9 by cathode 75 is performed by spraying at a pressure of up to 1-10 mm Hg. with a voltage of up to 3000 V. At the end of the ion cleaning process shutter 7 - between chambers 3 and 4 opens. The cover 15 is connected to the container 14 by means of the mechanism 23 and the transport device 8 is transferred to the chemical heat treatment chamber 6, where the cover 15 is disconnected from the container 18 in the same way as in the ion cleaning chamber 3. Technological shutter 7 closes. In the chemical-thermal treatment chamber 4, the product 9 is subjected to ion nitriding in the plasma of a high-current glow discharge at a pressure of 1-10 mm Hg. and a voltage of 400-1200 V. Upon completion of the ion nitriding, the transport device 8 with an appropriate pusher 10 moves the container 14 to the refrigerator 5. After cooling the products 9, the shutter 7 between the chambers .6 opens and the transport device is moved with the corresponding pusher 10 into the unloading chamber b. The shutter 7 is closed, air is injected into the unloading chamber 6 and discharge is performed. In the case of a device for moving in the form of a pallet 18 with a rack 19, the product 9 is fixed in the suspension 20 installed and electrically isolated from the rack 19 by means of a dielectric 22 with slot-hole protection, the process is carried out in the same way, and the suspension 20 is connected to the electrical power supply through trolls 21. A slit protection prevents the occurrence of an arc discharge in the junction of a conductor with a dielectric. Performing the installation of the proposed scheme with a device for transportation allows for continuous processing of products. The principle of continuous chemical heat treatment (during transportation of products along the process line) results in higher performance, along with the standard properties of the processed products, obtained by eliminating the need to cool the product before unloading in the same chamber as it does in batch furnaces. Claim I. An installation for chemical-heat treatment with a glow discharge, comprising preheating, chemical heat treatment and discharge chambers, a transfer mechanism and a moving device, characterized in that, in order to increase productivity and improve the quality of the product, it is equipped with pre-heating chamber the loading and ion cleaning chamber placed between the preheating and chemical heat treatment chambers, and the cooler installed between the chemical thermal treatment chambers and unloading while the loading and ion cleaning chambers and the refrigerator have moving mechanisms. 2. Installation under item 1, characterized in that the device for movement is made in the form of a pallet with a stand and a suspension mounted on it, on which is placed a troll that has the ability to interact with one of the poles of the source of ionic ion cleaning and heat treatment chambers . 3. Installation under item 1, characterized in that the device for movement is made in the form of a container and a cover with a suspension and. with contact interacting with one of the poles of the power source of the chambers of ion cleaning and chemical heat treatment. Sources of information taken into account during the examination 1. Swiss patent number 427073, cl. 21 h 16/60, 1967. / 3 Ь 10. sixteen i5 Fi9.Ъ