RU2648591C2 - Method of creating an identification mark on metal film - Google Patents

Abstract

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a method of creating an identification mark on a metal film and may be used for marking electrically conductive parts, for example rolled products, parts of vehicles, products of mechanical engineering, aircraft building, products of the nuclear industry, in particular TFE. Electro spark discharge is performed between the high voltage electrode and the metal carrier and then a digital code and a virtual identification grid are applied. Simultaneously with an electric spark discharge around the discharge gap, a stochastic magnetic field is created. For this purpose, around the discharge gap, a drum is mounted with the possibility of rotating it. On the drum randomly set a set of permanent magnets of different shapes and different coercive forces.

EFFECT: method of creating an identification mark is proposed.

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Description

The invention relates to the field of identification of material resources and can be used for marking electrically conductive parts, for example, rolled products, vehicle parts, engineering products, aircraft manufacturing, nuclear products, in particular fuel elements, defense industry, etc.

A known method of identification [1], based on the assignment of a material resource identification number. The way to create a tag is characterized in that a vibrating electrode is placed with a gap above the electrically conductive material resource and an electric spark discharge is created between them, the electrode being moved along and across the information grid according to the law of random numbers, the identification number and the visual picture from the electrodischarge process are scanned simultaneously and the subsequent one the identification process is carried out by comparing the identification number and the visual image from the electric discharge process.

However, this identification method is unreliable and inefficient due to the length of the process of applying identification features.

A known electric-discharge method for manufacturing an irreproducible identification tag by applying an identification number, an information grid and an irreproducible picture to it by performing discharges and entering an irreproducible picture into a database [2], characterized in that the irreproducible picture is created by a discharge between the main and additional electrodes, and identifiable a dielectric product, such as paper, is installed between the primary and secondary electrodes.

However, this method is applicable only for creating identification marks on paper.

As a prototype, a method of manufacturing identification marks [3] on a metal by electrically discharging onto a medium, assigning it a digital code and a virtual information grid was chosen. An irreproducible picture is created by a discharge between a tag and a composite electrode made of nanocomposites of ultrafine metal powders, according to the law of random numbers, at least one spot is extracted from all electrodischarge spots, its (their) coordinates are entered into the database on the information grid, removed from these selected spots spectral characteristic and enter it into the database, and identification is carried out in two stages.

However, this method has significant disadvantages, since it requires the use of expensive spectral instruments. The rejection of expensive spectral instruments, in principle, allows the scanner to remove the characteristics of discharges on a metal carrier. The main disadvantage of this method can be recognized as low efficiency, the need for multiple spark discharges, which does not allow to raise the productivity of this process to the desired level. Pointwise spots from discharges by themselves, without spectral characteristics, have low information saturation. All these shortcomings arise due to the use of a spark discharge, which can create only limited spot sizes and cannot create more information areas with maximum identification saturation. When using relatively thick metal films, there is a tendency for all subsequent discharges to hit the same point. A new technology is needed to ensure that a spark discharge reaches different points of a metal film.

The technical result is an increase in the distance between electric-discharge perforations on metal films, and, consequently, an increase in the probability of non-repetition of the matrix.

This goal is achieved by the fact that the method of creating an identification mark is carried out by electric discharge between a high voltage electrode and a metal carrier, followed by applying a digital code and a virtual identification grid.

A feature of the proposed method is that around the discharge gap create a stochastic magnetic field. To do this, a drum is mounted around the discharge gap with the possibility of rotation, and a set of permanent magnets of various shapes and different coercive forces is randomly mounted on the drum.

The method is carried out in the following sequence (Fig. 1) A metal film 2 is installed between the high-voltage electrode 1 and the grounded bed. At the same time, high-voltage voltage is applied to the electrode 1 and the drum 5 starts to rotate with a randomly set of permanent magnets 6 of different shapes and coercive forces. 7 - high-voltage discharge capacitor that enhances the discharge energy. 8 - source of high voltage. Under the action of a stochastic magnetic field, the plasma of the spark discharge deviates each time in the opposite direction. After applying the required number of perforations on the metal film 2, a digital code 3 and information grid 4 are applied to it. Before applying the perforations on the next metal film 2, the location and properties of the permanent magnets are changed.

An example of the implementation of method No. 1. The installation on the drum 5 of a random set of seeded neodymium magnets creates all the conditions for implementing the method. Neodymium magnets are the strongest permanent to date. Such magnets are made of an alloy containing the rare-earth material Nd, as well as iron and boron and have very high rates of residual magnetic induction and resistance to demagnetization. Permanent magnets can be installed on the drum 5, it is possible with the help of glue, but given the fact that these magnets are used as magnetic holders and it is necessary to periodically change their location on the metal film 2 to arrange the perforations on the metal film 2, it is optimal to use magnetic properties for fixing them on the drum 5.

An example implementation of method No. 2. A single N35 neodymium magnet in the form of a cylinder with a residual magnetic induction of 1.20 T and a current coercive force of 950 KA / m was mounted on drum 5. Drum 5 in this example was stationary. The average deviation of the perforations from the spark action on the metal film 2 was about 5-7 mm (compared with the absence of a permanent magnet).

An example implementation of method No. 3. All indicators coincide with example No. 2, but a permanent neodymium magnet of the same shape is made of N42H brand of residual magnetic induction of 1.35 T and a coercive force of 1340 KA / m. The average deviation of the perforations on the metal film 2 almost doubled, confirming the known effect of the magnetic field on the current flowing between the high-voltage electrode 1 and the metal film 2.

Information sources

1. Patent MD No. 3389.

2. Patent MD No. 3953.

3. Patent MD No. 4498.

Claims (2)

1. A method of creating an identification mark on a metal film, including the implementation of an electric spark discharge between a high voltage electrode and a metal carrier and the subsequent application of a digital code and a virtual identification grid, characterized in that at the same time as an electric spark discharge around the discharge gap a stochastic magnetic field is created. 2. The method according to p. 1, characterized in that the stochastic magnetic field is created by installing around the discharge gap of the drum with the possibility of rotation, on which a set of permanent magnets of different shapes and different coercive forces is randomly set.

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