JPS597462A - Flaky copper-manganese alloy - Google Patents

Abstract

PURPOSE:To obtain a flaky copper-manganese alloy and to perform brazing, hardening and tempering of steel with one time of heating and a series of treatments by flowing the melt of the copper-manganese alloy down onto the surface of a rotating body for cooling under rotation at a high speed. CONSTITUTION:A blank material of a copper-manganese alloy is melted by high- frequency induction heating and the melt 1 thereof is flowed out from a nozzle 2 onto a rotating body 3 by utilizing the pressure of gaseous argon or the like and is cooled on the surface of the body 3, whereby a flaky copper-manganese alloy having a uniform thickness is obtd. Brazing, hardening and tempering of steel are accomplished easily with one time of heating and a series of treatment if the above-mentioned brazing material is used.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a copper-manganese alloy, particularly a flaky Norman gun as a brazing material.

(2) Prior art and related points Conventionally, brass solder and silver solder have been mainly used for soldering steel. Further, steel is often subjected to heat treatments such as quenching and tempering. Since both brazing and heat treatment require heating, it is clear that it would be highly desirable if these could be accomplished in one heat treatment. Therefore, a brazing material that allows steel to be brazed and then quenched and tempered is desired (on the contrary, brazing during the quenching and tempering cooling process is In order to carry out such continuous processing easily and stably in a series of furnace treatments, it is necessary to use thin flakes of brazing filler metal. It is desirable that the filler metal can be used while being left in place. If so, it is possible to perform all of the above continuous processing by sandwiching the brazing filler metal between the steel materials, setting it in a jig, and passing it through a temperature-controlled furnace. This is because it becomes.

However, the heating temperature for hardening and tempering steel depends on the material and desired properties, but is generally 800°C.
Therefore, the melting temperature of the brazing filler metal for carrying out the above-mentioned continuous treatment needs to be slightly higher than that. The melting temperature of brass solder and silver solder is approximately 600~
780 DEG C. and about 855 DEG C. to 935 DEG C., and it is either impossible to obtain the desired melting temperature, or even if it is obtained, the conditions are difficult. Furthermore, silver solder is expensive.

Therefore, when we investigated materials with a suitable melting temperature, we found that copper-manganese alloys were suitable. Its melting temperature is pure copper 1083
℃, pure manganese 1244℃, eutectic composition (approximately 65 tons of copper,
(approximately 35% manganese) at approximately 870°C. However, copper-manganese alloys have poor hot workability and cold workability, so they cannot be processed into flakes. At least one of the inventors of the present invention has not been aware of any report that a flaky Norman gun has been obtained, and although they have devised and studied various ways to obtain a flaky Norman gun, hot processing is still difficult. However, the final step, cold working, was simply impossible.

(3) Purpose of the Invention In view of the above-mentioned prior art, the present invention provides a suitable brazing material for brazing, quenching, and tempering steel in a single heating and series of treatments, and in a simple manner. The purpose is to

(4) Structure of the Invention In order to achieve the above-mentioned objectives, the present invention provides a method in which the molten copper-manganese alloy is rapidly solidified by flowing it down onto the surface of a cooling rotor rotating at high speed. To provide a flaky Norman gun formed into a flaky shape at the same time.

A method for producing a copper-manganese alloy in the form of a foot piece according to the present invention - A molten metal of a copper-manganese alloy is rapidly solidified by dropping a molten metal of copper-manganese alloy onto the surface of a cooling rotor rotating at high speed. An example of a specific embodiment of the method of forming a thin plate at the same time as forming a thin plate (described below with reference to page 5IX1).

In any of the embodiments shown in Figs. 1 to 3, the copper-manganese alloy material is melted by, for example, high-frequency magnetic induction heating, and the molten metal 1 flows out from the nozzle 2 onto the rotating body using the pressure of Cairgon gas, etc. It can be cooled on the surface of the rotating body.

The molten metal flowing out in this manner can be simply brought into contact with the outer periphery ω1 of the cooling roller 3 rotating at high speed, as shown in FIG. Moreover, as shown in FIG. 2, rapid cooling can be performed between the pair of rolls 40 rotating at high speed in opposite directions. In this way, flakes with more uniform thickness can be obtained. Furthermore, as shown in FIG. 3, it is also possible to flow down onto the inclined inner surface of the white body 5 which is rotating at high speed, and to rapidly solidify it continuously.

The above-mentioned specific method is just an example, but by thinning copper-manganese alloy with this method, it is possible to obtain approximately 5W, which is the limit that can be obtained by conventional hot (cold) working.
It has become possible to obtain a material with a thickness of about 25 μm to 100 μm, compared to a thickness of 25 μm to 100 μm. In addition, the composition (melting temperature) and the dimensions (thickness, width) of the flaky Norman gun according to the present invention.

It is readily apparent that the length can be appropriately selected depending on the intended use.

Hereinafter, the present invention will be explained in detail using examples.

(5) Embodiment of the Invention The entire apparatus shown in FIG. 2 was used. Steel with a composition ratio of 65% and the remainder, remanganese, were melted by high frequency heating to obtain a molten metal 1 at about 1300°C, which was passed through a narrow nozzle 2 with a total nozzle diameter of 0.5 wm and allowed to flow between a pair of copper rolls 40 with a diameter of 200 ttaφ. The total pressure of the argon gas used to push out the molten metal was 0.5 to I Kv'cil, and the pressure was set at 40
The spacing is approximately 50 μm, and the rotation speed of the roll 4 is t3000r.
pm, and a whole sheet of flaky Redene having a thickness of about 50 μm and a width of about 50 μm was obtained. The melting temperature of this flaky Norman gun is about 870°C.

The shape of the nozzle hole in this example was a perfect circle with a diameter of 0.5 φ, but for example, the long axis 1. O+a, using an oval nozzle hole with a minor axis of 0.5 wm, under the same conditions as before.

For example, a flaky IJ with a thickness of about 50 μm and a width of about 100 μm
, %-n can be obtained.

Next, the shear strength of brazing performed using the flaky Norman gun produced in the above example was tested. For brazing, short steel plates (about 0.9% carbon) of 100 x 10 x 1 (mJ) are placed in a jig so that their tips overlap, and a flaky copper-manganese alloy is placed between the steel plates. This was done by passing through a conveyor furnace using gold scissors and a nitrogen atmosphere. The shear strength of the brazed portion of the steel plates brazed in this way was measured using a tensile tester. The wax liquid temperature t'' was determined by changing the furnace temperature m degrees, and the relationship between the wax liquid temperature and shear strength was determined. It is shown in Figure 4. A shear strength of MPa has been obtained.

Finally, the same short rail-shaped steel plate as in the above example was set in the same jig and passed through a conveyor furnace. However, this time, the temperature inside the furnace was adjusted as shown in Figure 5, and the soldering was performed from a relatively high temperature of approximately 800°C, at which the once-molten brazing filler metal had solidified and was still cooling. The steel plate was directly placed in an oil bath at about 70° C. for quenching.

This hardened steel plate showed a hardness of HRC58, and there was no difference in quality from that which had undergone normal hardening treatment, and furthermore, the soldered parts did not suffer deformation or other damage due to the hardening treatment. .

Although the embodiments of the present invention have been described above, those skilled in the art will be able to understand the production of the flaky steel-manganese alloy according to the present invention and the treatment of steel materials using the flaky steel-manganese alloy. It is easy to transform it and make it fit for purpose.

(6) Effects of the Invention As is clear from the above explanation, the present invention provides a flaky copper-manganese alloy, which can be used for brazing, quenching, filling, backing, and other heat treatments of steel. can be performed in one continuous process.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of one example of an apparatus for carrying out the entire invention, FIG. 2 is a schematic sectional view of another example, FIG. 3 is a schematic sectional view of yet another example, and FIG. The figure shows the present invention ((
Figure 5 shows the results of soldering of steel plates using filler metal according to the present invention and the graph of solder liquid temperature vs. shear strength for all tests. It is a graph showing a profile of temperature versus time in a series of quenching treatments. 1... Molten metal, 2... Nozzle, 3... Roller, 4...
...pair of rolls, 5...mouth-shaped cooling body. Patent applicant Fujitsu Limited Patent application agent Yukio Uchida Figure 2 Figure 4 Figure 5 Time

Claims (1)

[Claims] 1. A flaky Norman gun made by letting a molten copper-manganese alloy flow down onto the surface of a cooling rotor rotating at high speed, rapidly solidifying the molten metal, and simultaneously forming it into a thin plate.