JPS60174937A - Discrimination of different kinds of metal materials - Google Patents

Abstract

PURPOSE:To make it possible to instantaneously discriminate the kind of a metal to be determined, in an apparatus wherein a pair of contact probes, to which temp. difference is imparted, are contacted with the metal to be determined and the potential difference of the metal is measured, by providing heat stabilizing metal blocks to the contact probes. CONSTITUTION:To the temp. rising contact probe 1 among a pair of contact probes, a contact probe main body 2 made of copper or a copper alloy, a heater 4 and a metal block 6 are attached while a contact probe main body 11 made of copper or a copper alloy and a metal block 15 are attached to the other contact probe 10. The temp. rising contact probe 1 is raised in temp. by heating and a pair of the contact probes 1, 10 are contacted with a metal 20 to be determined and the potential due to the temp. difference of both contact probe main bodies 2, 11 is measured by a potentionmeter 21. Because the metal block 6 is attached to the contact probe main body 2 as mentioned above, a temp. is stabilized. Therefore, the temp. difference of a pair of the contact probes is stably held and, as a result, the potential difference due to the kind of the metal 20 is detected with good accuracy and the kind of the metal 20 can be instantaneously determined.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for discriminating different types of metallic materials, which can instantly distinguish between different metallic materials using a device with a simple configuration.

A method that utilizes the thermoelectric Seebeck effect between two types of metal materials is known as a material for identifying metal materials, in which one of a pair of contacts is electrically heated to measure the temperature difference between it and the other contact. For example, metal sealants have been identified by bringing them into contact with a metal material to be determined while controlling the temperature to be constant at 55° C., and measuring the thermoelectric potential difference between the pair of contacts with a millivolt meter.

The discrimination device used in the conventional discrimination method cannot accurately discriminate unless the temperature of a pair of contacts is kept constant. Therefore, each contact is equipped with a temperature sensor such as a thermocouple, and a heating mother It was necessary to control the heating using a controller to always obtain a constant temperature difference, and a complicated and expensive temperature control device was indispensable.

The object of the present invention is to provide a method for discriminating metal dissimilar materials that can instantly distinguish between different metal materials, and also for a discriminating method using a simple configuration and extremely inexpensive discriminating device.

In other words, the present invention includes a pair of contacts made of copper or a copper alloy, in which an electric heating device for raising the temperature is attached to one side, and at least a metal block for thermal stabilization is attached to the contactor to be heated. Using a discrimination device equipped with a voltmeter that can measure the potential difference between a pair of contacts, one contact is heated up and each of the pair of contacts is brought into contact with two or more metal samples, and the resulting voltage is measured. This is a method for discriminating different metal materials, which is characterized by comparing the output values of the meters and discriminating whether the metal materials are different or the same.

The temperature increasing heating device in the discrimination device according to the present invention may be any known heating device, and the heat stabilizing metal block may be made of copper or copper metal, which is the same material as the contact, or a different metal. Well, the dimensions and weight of the contacts are
It may be selected depending on the weight, capacity of the heating device, etc.

The present invention will be explained below based on the drawings.

FIG. 1 is a longitudinal sectional view of a discriminating device used in the method of this invention.

The contact (1), which is equipped with an electric heating device for increasing the temperature, has a wooden grip (2) on the contact body (2) made of rod-shaped copper.
3) is loosely inserted and fixed with a bolt (5), and a heating winding (4) made of nichrome wire or the like is locally attached to the outer periphery of the end of the main body (2) inside this grip part (3). By connecting it to an AC 100V power supply, it is possible to heat up the temperature, and the other end of the main body (2) becomes a contact part that comes into contact with the metal to be determined.
The shape is appropriately selected depending on the shape of the metal to be determined, such as a convex shape or a curved surface shape, but in this case, a sharp tip is used. A cylindrical copper alloy metal block (6
) is secured with a bolt (force).

The other contact (10) has a main body (
Attach the wooden handle (12) to one end of the bolt (13).
), and a metal block (14) similar to the above-mentioned contactor (1) is secured with bolts (15).

The bodies (2) (11) of this pair of contacts Tl) (10)
A millivoltmeter (21) is connected in series between them, and the potential difference can be measured when the tip of the contact (fl) (10) is brought into contact with the metal plate (20) to be determined.

Incidentally, after applying a current to the heating winding (4) and holding it for 15 minutes, the above pair of contacts +1) (10) was applied to each of the five types of metal plates with a thickness of 3 mm shown in Table 1. The millivolt meter (
The output value of 21) was investigated.

As shown in Table 1, the measurement results show that unique output values are obtained for each material, and the values are almost constant and have excellent reproducibility, making it possible to instantly identify one type of metal.

In the method of this invention, the measured values are stable as shown in Table 1, and dissimilar metals can be easily and accurately distinguished because the metal blocks attached to the pair of contacts have an excellent ability to maintain the current temperature of each contact. This is because the humidity difference between the contacts is sufficiently stable, there is no need for an expensive and complicated temperature control device like in conventional devices, and the configuration is simpler than in conventional devices.
It has the advantage of being stiff and inexpensive.

The method of this invention can reliably and easily distinguish metal materials using an extremely inexpensive discrimination device, and can not only distinguish between single metal materials, but also distinguish between the front and back sides of composite metal materials such as bimetals, and when different materials are mixed together. Effective in prevention.

Margin below Table 1 Margin below

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a discriminating device used in the method of this invention. 1.10...Contactor, 2.11...Main body, 3,12
...Grip part, 4...Heating winding, 5, 7, 13.15
...Bolt, 6.14...Metal block, 20...
-Metal plate to be determined, 21... millivolt meter. Figure 1

Claims (1)

[Claims] 1 Potential difference between a pair of contacts made of copper or copper alloy, one of which is equipped with an electric heating device for raising the temperature, and at least the contact to be heated is equipped with a metal block for thermal stabilization. Using a discriminator equipped with a voltmeter capable of measuring A method for discriminating different types of metallic materials, characterized by discriminating between different metallic materials.