JPS61130477A - Working method of nickel silver - Google Patents

Abstract

PURPOSE:To shorten manufacturing process and to decrease manufacturing cost, by hot working nickel silver incorporated with specified ratios of Ni, Zn, Cu under a prescribed condition. CONSTITUTION:Alloy composed of 74n25wt% Ni, 5-32wt% Zn and the balance Cu is melted. Ingot of the alloy is hot worked at 600-800 deg.C, by 10-30% draft. Next, said material is cooled, heated again and hot worked. By the method, manufacturing process is shortened, manufacturing cost is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in the processing method of nickel silver, and in particular, to rationalize the manufacturing process by making hot processing possible.

[Conventional technology]

Generally Ni 7-25%, Zr 55-32%, balance Cu
The alloy made of nickel silver is called nickel silver, and it is widely used as parts of electrical and electronic devices because it has excellent strength and spring properties compared to other non-ferrous spring materials. However, when processing Western seals, they are processed exclusively by cold processing due to their poor hot workability, which inevitably increases the cost of the product.

That is, when a block of nickel silver is hot-rolled, large cracks occur on the surface of the rolled plate, making subsequent rolling impossible. Further, since nickel silver is highly work hardened, intermediate annealing must be performed many times, which complicates the manufacturing process and significantly increases costs.

[Problem that the invention seeks to solve]

As a result of intensive research in view of the current situation, the present invention has been developed as a processing method for nickel silver, in which a nickel silver ingot is hot worked and rolled, but the surface is comparable to that obtained by cold working. We have developed a processing method that produces products that are in good condition, that is, without any cracks.

[Means for solving problems]

The method of the present invention is Nl 7-25wt1, Zn 5-3
This method is characterized in that a nickel silver ingot consisting of 2vt q& and the remainder being Cu is hot worked at a processing rate of 10 to 30%, then cooled and heated again to perform hot working.

That is, when a nickel silver ingot was hot worked, for example, hot rolled, at various working rates, the first hot rolling rate was 10.
~30%, once cooled, and then heated again, the 90 to 9
It was discovered that equivalent cracking does not occur even when hot rolling is carried out at a rate of about 5%.

In the method of the present invention, it is extremely important to perform the first hot working at a processing rate of 10 to 301;
The reason why it is limited to ~30% is that if it is less than 10%, the processing will be insufficient, and fine recrystallized grains will not be sufficiently generated during cooling and re-tempering after hot working. This is because if further hot working is attempted, cracks will occur on the surface.

Also, if it exceeds 30%, cracks will occur on the surface of the rolled plate.
This is because these cracks grow into large cracks during the second hot working.

It is desirable that the heating temperature for hot working is in the range of 600 to 800°C. If the temperature is less than 600°C, sufficient processing will not be possible, and if the temperature exceeds 800°C, excess energy will be required for heating. This is because it is expensive and not economical.

Further, in the present invention, cooling is performed after hot working, and the temperature must be cooled to around room temperature.

[Effect]

In the method of working nickel silver, the method of the present invention can be performed by hot working, so that the process can be performed with extremely low deformation resistance compared to conventional cold working. In other words, since nickel silver is a hard steel alloy, cold working requires intermediate annealing as mentioned above, as well as special tools for the large power difference, but hot working does not. As a result, the power cost can be reduced and processing can be performed using ordinary tools without performing the above-mentioned intermediate annealing.

〔Example〕

Copper is melted in a high-frequency melting furnace, Ni is added thereto, Zn is added thereto, and this is cast by continuous water-cooled casting to produce a nickel silver ingot (thickness 100 W+) having the composition shown in Table 1.
, width 250 sm, 300kli+/1 charge). This ingot was heated in a range of 600 to 800°C, hot rolled at various processing rates, cooled to room temperature, and then heated again to a temperature of 600' to soo°C to a thickness of 10 mm and Hot rolling was carried out at 5 vmt to obtain a nickel silver plate of the present invention.

In order to compare with the nickel silver plate of the present invention, the above nickel silver ingot was rolled under conditions other than the method of the present invention as shown in Table 1 to obtain a comparative nickel silver plate. The white boards and comparative nickel silver boards were tested for the presence or absence of cracks on their surfaces, and the results are shown in Table 1.

As is clear from the above table, when the method of the present invention was used, a good rolled nickel white board could be obtained without any cracks occurring on the surface.

On the other hand, if the nickel silver ingot was directly hot-rolled to a thickness of 10 m without first hot-rolling as in A11 to Step 3, large cracks would occur on the surface and post-processing would be impossible. possible) and could not be used as a product. Also l6
When the first hot rolling is carried out in the range of 32 to 35 yen as in Nos. 17 to 20, small cracks occur on the surface of the plate after the rolling, and these cracks develop into large cracks in the second hot rolling. It grew to such an extent that further processing was impossible. In addition, when hot rolling was less than 10% as in Nos. 414 to 16, cracks occurred on the surface and subsequent processing was impossible.

〔effect〕

As detailed above, the method of the present invention is extremely useful industrially, as it can shorten the manufacturing process and significantly reduce manufacturing costs.

Procedural amendment Showa Era I’p, Oj’s, 26th Director General of the Patent Office Michibu Uga 1.Display of the incident Patent Application No. 59-251141 2. Name of the invention How to process nickel silver 3. Nagisa making corrections Relationship to the incident Patent applicant (529) Furukawa Electric Co., Ltd. 4. Agent 6. Subject of correction Specification 7. Contents of correction (1) On page 2, line 10 of the specification, 1 “Complication.

Correct the phrase ``to complicate'' to ``complicate''.

Claims (2)

[Claims] (1) After hot working a nickel silver ingot consisting of 7 to 25 wt% Ni, 5 to 32 wt% Zn, and the balance Cu at a processing rate of 10 to 30%, it is cooled and heated again to perform hot working. A processing method for nickel silver that is characterized by: (2) The method for processing nickel silver according to claim 1, characterized in that the hot working is carried out at a temperature in the range of 600 to 800°C.