JPH0347617A - Auxiliary extruding method for hardly workable combined billet - Google Patents

Abstract

PURPOSE:To keep the constant area ratio in the extruding direction and to prevent the rough skin and the outer scratch from generating by extruding at the conditions of the specific temp. and the specific extruding speed on the case of extruding the combined billet of Ni outer skin and Cu central part. CONSTITUTION:The combined billet of the Ni outer skin 1 the ratio of which at its sectional area is 10-30% and the Cu central part is extruded. In this case, by using the container 14, it is inserted in the container 14 with the top chamfered part toward the side of the die 13, and is extruded by moving the die 13 with the pressurizing system 15 and the seal block 16. At this time, it is extruded on the conditions of the extruding ratio : 6-15, the temp. : 500-700 deg.C and the extruding speed : 10-60mm/sec. In such a way, the defectless combined material is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applicable to applications 1 that are used in corrosive environments and require electrical conductivity, such as insoluble electrodes for soda electrolysis and steel sheet surface treatment;
Alternatively, the present invention relates to a method for manufacturing a nickel clad cavity used as an electrode 1 current conducting body of plating equipment such as tin plating and precious metal plating.

[Conventional technology]

Electrodes and current-carrying bodies used in corrosive environments are required to have high reliability and conductivity. The material is formed using a pure process with excellent conductivity.

A composite cladding with a cross section in which both are integrally joined is used.

Methods for manufacturing such composite clad materials include resistance welding, explosion bonding, extrusion, and the like.

In the resistance welding method, a corrosion-resistant steel material and a steel material are overlapped and resistance welded to join and integrate the two, but since one of the materials to be welded is copper material with good conductivity, the steel material and the corrosion-resistant material are It is difficult to join with. Therefore, it is necessary to weld via a copper strip or copper mesh at the joint interface, and the corrosion-resistant and steel materials are only partially joined at the strip or rope section, which cannot be said to be a good composite material.

In addition, depending on the material, the explosive bonding method tends to produce locally brittle intermetallic compounds at the bonding interface, and peeling due to cracking of the compound during straightening and processing is likely to occur, and productivity is also poor.

On the other hand, using the hot isostatic extrusion method, which is said to be able to diffusion bond the peripheral material and the core material under high temperature and high pressure, and to keep the area ratio of the composite material uniform in the extrusion direction, There are also cases where they are manufactured.

However, this method requires complicated steps to improve the bonding between the outer peripheral material and the core material at the stage of manufacturing the composite billet. That is, to make the interface between the outer material and the core material a new surface by cutting, etc., to prevent the outer material and the core material from shifting during extrusion processing, and to prevent the pressure medium used in hydrostatic extrusion from entering the interface. It is required that the interface be degassed before welding. As a result, the composite billet manufacturing process is complicated and has poor productivity6.Furthermore, processes such as cold open rolling are required to finish the billet to a predetermined size, which further increases the processing cost.[Problem to be solved by the invention] However, as a result of intensive research by the present inventors into a method for processing composite clad materials to their final dimensions by the above-mentioned indirect extrusion method, which has been conventionally used for processing general materials,
A good composite clad material can be obtained by optimizing the manufacturing conditions of the flat billet, such as billet composite, shape, and lubricant thickness, as well as the extrusion conditions, such as billet heating temperature, die angle, and extrusion speed. I discovered that.

The present invention was completed based on the above findings, and an object of the present invention is to provide an indirect extrusion method by which a healthy kneaded clad material can be more easily obtained from a flat billet in which a nickel corrosion-resistant material is crimped onto the outer peripheral surface of a steel material. It is an object.

[Means to solve the problem]

In order to achieve the above object, the present invention has been developed to extrude a composite billet consisting of a nickel jacket and a copper core in which the ratio of nickel in the IN area is 10 to 30%.
15, temperature 500-700'C2 extrusion speed 10-6
This is an indirect extrusion method for difficult-to-process composite billets characterized by extrusion at a rate of 0 nn/see. A solid core copper material is inserted, and the core copper material is compressed in the longitudinal direction so as to be brought into close contact with the outer nickel material, and the resulting composite billet is used.

〔Example〕

Next, an embodiment according to the present invention will be described.

First, to explain the manufacturing method of the composite billet used in this example, as shown in Fig.
Core material of 6 theories 2. was attached to the nickel tube 1, which is the outer peripheral material with a wall thickness of 5 nn and an outer diameter of 87 ngn, and as shown in Fig. 2, the core material was pressed with a press material at vJ2 and 5 ton/al to separate the core material and the outer peripheral material. Crimp.

For the nickel tube used as the outer peripheral material, a flat plate is bent into a cylindrical shape, the mating surfaces are welded, and the welded portion is removed using a grinder, or a seamless tube is used.

Before installing these materials, the core material and outer peripheral material should be cleaned by pickling or the like to ensure that there are no oxidized layers or deposits. The steel material serving as the core material should be longer than the cylindrical depth of the outer circumferential material, taking into consideration the gap with the outer circumferential material. Furthermore, the manufactured composite billet is chamfered as shown in 3 in Figures 3 and 4 so that the extrusion work can be carried out smoothly and the joint between the outer peripheral material and the core member is better after extrusion. (Nose attached)
I do. This angle is the angle that matches the die angle (90~1
7. Apply graphite lubricant to the composite billet produced as above and thoroughly dry it in a dryer.The appropriate thickness of this graphite lubricant is 0.1 to 0.3 mm. If it is too thin, it will cause seizure, and if it is too thick, it will cause extreme roughness.

The composite billet specimen manufactured in this way is charged into the container 14 shown in FIG. 5 with the side of the tip side facing the die 1.3, and the pressurized stem 15 and seal block 16 moves the die 13 and extrudes the extrusion ratio.

Experiments were conducted with various heating temperatures and extrusion speeds.

In this experiment, when the extrusion ratio was less than 6, the bond between nickel and copper was poor, and when it was 15 or more, clogging occurred. Also, if the temperature during extrusion is less than 500°C, clogging will occur,
At temperatures above 700'C, vertical scratches occurred on the surface, making it impossible to obtain a sound rad.

Furthermore, when the extrusion speed was less than 10 mm/sec, clogging occurred, and when the extrusion speed was more than 60 mm/sec, the nickel of the outer skin broke.

From the results of the above experiments, this example, in which the extrusion ratio, extrusion temperature, and extrusion speed were all within the range of the present invention, had all good results as shown in Table 1, and a sound composite clad material was obtained. Ta.

In addition, when observing the interface using EPMA in a sample cut out from a part of Nα3 of this example, a diffusion layer of about 10 μm was observed, and the shear strength was roughly 13 to 14.
A healthy composite of kg/ran2 was obtained. The outer diameter was also good, being less than ±0.08+nn with respect to the target value.

On the other hand, as shown in Table 1, the comparative example in which one of the navigational elements was outside the scope of the present invention did not yield good results.

The wooden marks on the first table indicate the present example. The marks Δ indicate comparative examples. [Effects of the invention] According to the present invention described above, a composite billet in which a corrosion-resistant nickel material is crimped onto the outer peripheral surface of a copper core, which is a conductive material, is
Heating to ~700°C, extrusion speed 10-60 mm/s
Because it is extruded using EC, the area ratio is constant in the extrusion direction, and there is no rough skin or damage to the surface. Also, a diffusion layer of about 10 μm is formed at the interface between the outer material and the core material, resulting in a healthy composite. Krat wood is easily obtained.

Furthermore, since the extrusion method according to the present invention is not a hydrostatic extrusion method but an indirect extrusion method within a membrane, the composite billet used may be welded with the interface degassed as in the past, or a solid material may be used during mounting. There is no need for special processing such as creating a new surface by cleaning the material, and simply cleaning the material such as pickling and crimping the core material to the outer material using a press is sufficient, resulting in excellent industrial productivity. .

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the pressing acid of the composite billet used in the present invention, Figure 2 is a vertical cross-sectional view showing the core material pressed and crimped to the outer peripheral material, and Figures 3 and 4 are the composite billet. FIG. 5 is a longitudinal sectional view showing a state where the tip of the billet is chamfered, and FIG. 5 is an explanatory view showing a state of hot indirect extrusion in the method according to the present invention. 1... 2... 3... 11... l 2... 13... 14... 15... 16... 17... Peripheral material, core material, chamfered part , peripheral material, nickel clad material, die, container, stem, seal block. dummy block. Substitute embedding space Tetsuro hand lF5℃ Amendment September 1989 Figure 3 Figure Figure 1゜Indication of the incident 1999 Patent Application No. 184380 2, Title of the invention ■ Workability Indirect extrusion of composite billet Method 3: Relationship with the person making the amendment Address of the patent originator 2-10-1 Toranomon, Minato-ku, Tokyo Name Nippon Mining Co., Ltd. Representative Tatsuo Nakamura 4 Address of agent 110 Taito-ku, Tokyo Aoki Building 2nd Floor 7, 1-12-11 Taito, subject of amendment, Ming, detailed explanation of the invention in book i'll I, and column for brief explanation of drawings in book Ming 2I. 8. Contents of the amendment (1) "Indirect extrusion method" in the first line of page 4 of the RI book has been changed to "r indirect extrusion method." (2) "12...Nickel clad goods," on page 10, line 9 of the specification, "-12...Nickel clad copper,"
Changed to Step 1, Indication of the case Heisei Continuation Supplement 1st year patent official document (method) % formula % Address 2-10-1 Toranomon, Minato-ku, Tokyo Name
Japan Mining Co., Ltd. Representative: Tatsuo Nakamura Address: 5, 2nd floor, Aoki Building, 1-12-11 Taito, Taito-ku, Tokyo 110 Japan Date of amendment order: October 16, 1999 (Date of dispatch: 1999) (October 31) 6. Detailed description of the invention in the specification to be amended. 7゜Contents of amendment (1) Insert 0'3 "Detailed description of the invention" between line 16 and line 17 of page 1 of the specification. Above 105-

Claims (1)

[Claims] (1) When extruding a composite billet of jacket nickel and core copper whose cross-sectional area ratio of nickel is 10-30%, the extrusion ratio is 6-15, the temperature is 500-700°C, and the extrusion speed is 10-60 mm/ A method for indirect extrusion of a difficult-to-process composite billet, characterized by extrusion at sec. (2) Insert a solid core copper material longer than the cylindrical outer nickel material into the cylindrical outer nickel material, and compress the core copper material in the longitudinal direction so that it tightly adheres to the outer nickel material. The method for indirect extrusion of a difficult-to-process composite billet according to claim 1, characterized in that the composite billet obtained by the above-mentioned step is extruded.