JPS6054978A - Plasticity working tool for non-ferrous metal and nonferrousmetal alloy - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] B) Technical Field This invention relates to drawing, wire drawing, wire rod rolling of nonferrous metals such as aluminum, copper, lead, tin, nickel, cobalt, titanium, etc., or alloys containing these as main components. This relates to plastic working tools used in plate rolling, extrusion, or die casting.

(b) Technology front Conventionally, cemented carbide, die steel, and high speed steel have been used as plastic working tools for nonferrous metals and nonferrous alloys.

However, the manufacturing conditions for mass-produced products such as drawing rolls are becoming stricter year by year due to demands for flow and high precision. ll! Improvements in heat resistance, abrasion resistance, impact resistance, etc. are increasingly required for sacrificial machining tools.

In order to satisfy these performances, new materials are being actively developed in the field of plastic 1Q processing of cemented carbide, die steel, high speed steel, etc. ■ Shell material F1, but there is still no definitive direction. By the time I saw it, it was 1.7.

Metal plastic processing tool materials 11 and 11 are generally made of steel such as tool steel and carbide-containing metals, and when looking at the movement as new plastic processing tool materials, there have only been slight changes. .

On the other hand, ceramic materials have recently attracted attention as a material for plastic processing tools, but they have excellent thermal shock resistance, impact resistance,
Because it has inferior properties such as brittleness compared to the materials mentioned above, it has only gradually begun to be used in the field of plastic working tools such as guide rolls, which have low stress, and the idea of using it for rolling rolls has hardly been considered. Not yet.

(C) Disclosure of the Invention The present inventors have been studying the possibility of using ceramic materials as plastic working tools for many years, and as a result, they have arrived at this invention.

That is, the present invention is a new plastic working tool made of silicon carbide ceramic, in particular, having pores of less than 10%, and obtained by pressureless sintering.

This is a revolutionary change that breaks the conventional concept of various plastic working tools.

Silicon carbide is a type of ceramic material, and although it has the weaknesses of ceramics as described above, on the other hand, it has superior wear resistance compared to the metal phases, especially at high temperatures. In terms of abrasion resistance, it reaches 10 to 100 times that of candy.

Therefore, in the field of plastic 1/l addition I,:T:vp, especially in the field of hot rolling rolls used in high humidity,
+ Demonstrate great results.

The general concept for conventional jigs and tools is that in order to reach the end of their service life after a short period of use, processes and equipment must be added accordingly.

However, from the 4th gun, this bu is Akira! l'! 111 Machining shell using conventional tool J: 10~” 0fff 1>
It is now possible to extend the life of the
For example, it is possible to consider adding it to the periodic maintenance item 1 of the equipment itself. Unproductive 1.1 situations such as having to pull the button will be completely eliminated.
be.

As a result, the equipment's profit rate is not only 2 tons, but the stock that occurs during the process is reduced, and there is no need to dispose of a large number of hand-held shellfish. It is.

3- These plastic working tools differ depending on the metal to be plastic worked, but for example, when plastic working copper or copper alloy, when using conventional materials, there is a gap between the tool and the workpiece. A reaction occurs, a welding phenomenon occurs, and the surface layer undergoes repeated phenomena of welding and detachment, resulting in increased roughness or wear and tear, and eventually reaches the end of its life.

Particularly in hot working, cemented carbide and die steel high speed steel undergo a peeling phenomenon called spalling and a fatigue phenomenon due to repeated welding of the 11M1 theory, and this is the cause of shortened service life.

Also, when the metal to be plastic worked is aluminum, for the same reason, conventional cemented carbide and die steel HSS are
reach life.

The present inventors have arrived at the present invention as a result of studies to eliminate the above-mentioned drawbacks of these conventional plastic working tools.

The present invention will be described in detail below. First, it is important that the tool be made of a material that causes the least amount of welding. However, ceramics have a low weldability to metals.

Among them, the most common 4T alumina-based 12 ramic has low strength, high stress, and cannot withstand use in IFL processing where it is subjected to impact due to reliability 11 problems.

Therefore, we tried Test I~ using various types of T-shells, and found that ceramics based on SiC are superior to cemented carbide and die steel, which are conventionally used as plastic working tools for copper and copper alloys. 1.
．． It was.

That is, this invention contains StC at 60% or more,
To this, B, C, R, C, r3N, f3□03, A# S
/V I3, pigeon 03, Ap, C3, A#N, TLC
5TLNSBe, Boo, SL.

! 0.3 to 40% by weight of one or more types of grass such as tsN4, WC, etc., or ill B group, IVa
Contains 0.1 to 40% by weight of elements of groups IVI) or their oxides, carbides, nitrides, borides, and silicides.
This is a plastic processing worker for non-ferrous metals and non-ferrous alloys with 10% or less of pores consisting of the Notahara F1 composition.

In this invention, the method for manufacturing the SLC sintered body used as the main material is a method in which silicon carbide powder and graphite powder are molded together with an organic binder, which is calcined and then reacted and sintered in a silicon atmosphere. Alternatively, a method of adding an additive to promote sintering to silicon carbide powder and then performing pressureless sintering or hot pressing is known.

As a method for producing an SjC sintered body, there is a method of mixing coarse particles and fine particles of silicon carbide, holding the mixture at a high temperature of 2400 to 2600°C, and sintering it using recrystallization of silicon carbide.
This recrystallization method leaves 10% or more of vacancies, which is inappropriate for the purpose of the present invention.

Furthermore, in the former manufacturing method, it is known that the properties are greatly influenced by the use of additives.

However, basically high strength and impact resistance are required, and for this purpose it is necessary to use 60% by weight or more of SigN4.

Next, as additives to be used for SLC of 60 weight% or more, B, C, B, C, BN, 5JLos, AI
, An,, 80x02, A? 43, AI N 1Th
C, TLN, Be, l1lk+O, Si, 5Ls
Substances such as N4 and WC are effective, but the amount added is 0.
．． 3-40% weight R% (good weight: 10.5-20% weight)
is appropriate.

If it is less than 0.3 weight 111%, sufficient densification will not occur and more than 10% of pores will remain, which is not desirable. This is because properties such as hardness, impact resistance fl', 'C, etc. are impaired.

More preferably, 0, AQ, AP and 0 for SiC.
3, /VB,, M, C3, AQ N, Tic, TL
A sintered body containing 2 to 30% by weight of one or more of N, Be, Bed, SL, SL 3N 4, and WC is particularly suitable for use under conditions of 900°C or lower. There is little deterioration in toughness, hardness, etc., even when the die is below 171, so hot extrusion dies for copper, J
It is particularly effective in cold plastic forming such as T-rolls and guide rolls.

At the same time, when cutting shells for copper and copper alloys, their service life becomes significantly better.

This J: U4 sintered body is a mixture of the above composition and
= After thoroughly mixing and pulverizing the gold powder using a ball mill or other means,
Molding is performed at a pressure of 0.5 to 4t62, and then molded at 190°C in an inert atmosphere such as nitrogen or argon or in a reduced pressure atmosphere.
By sintering at 0 to 2200°C, a sintered body having 10% or less of pores can be obtained.

If the density is low, the strength will be low and the reliability will also decrease, so it is preferable to have as high a density as possible. However, if the porosity is less than 5%, there will be no effect, but if the manufacturing conditions and usage conditions (!1) are not severe, even if the porosity is less than 10%, there will be no effect.

Regarding SL J 4, either the α type or β type crystal system can be used without any difference in effectiveness.

In addition, 0.3 to 3% by weight of one or more of B, B, C, BN, B-03 and 0% of C are added to the SLC.
．． SLC sintered with 1-3% by weight added at 1100℃
It is particularly excellent when used under the following conditions of use.

Therefore, in addition to hot extrusion dies, rolling rolls, guide rolls, etc. for copper used under such conditions, it can also be used particularly in the field of elastoplastic processing.

4'? 1/1 plastic processing made of SIC
Shells include copper, aluminum, zinc, tin,
Nickel, ] Pal I~, Ditan T [vl' of any metal or alloy thereof! t'L 1111 T can be used for ceramic which melt @1!1 which irl
G and Fθ, which are the main components of lliJj alloy and die steel
Comparing the weldability with ceramic, it goes without saying that ceramic is far superior and has a longer life as a plastic working tool.

Examples of the present invention will be described below in detail regarding the case of n4 A3 J: and aluminum. It goes without saying that other non-ferrous metals and alloys thereof can exhibit the same effects as in 6.

Examples 1 to 10 Meishin sintering aids were blended with SLC in the proportions shown in Table 1, mixed in a ball mill, press-formed under a pressure of 1t4, and then under an argon gas atmosphere. A 10-stage hot rolling roll 10 for finishing copper wire by performing 2000~b at 1 atm.
I created a variety.

Table 1 shows the rolling temperature of each of these rolls, the rolling amount until the end of life, and the causes of life.

Table 1 From the above table, the rolling amount of conventional cemented carbide and die steel high speed steel reaches the end of its life after 500 to 50 tons at most, but the rolling amount of this invention increases to 2 to 5 times that life. This was recognized.

Examples 11-18 Compound B and C were blended with SLC at the same ratio as shown in Table 2, and thoroughly mixed in a ball mill.I5, Examples 1-
A hot rolling roll of copper wire having a length of 1" mm and 10 stages was prepared using the same strip 1'1 as in Example 10.

Using this rolling roll, roll mill r1 was heated to 950°C and 700°C.
When rolling was carried out at a temperature of 1σ at 500°C, the amount of rolling and the causes of life of the rolls are shown in Table 2, and even at high temperatures, the life of the rolls did not decrease. In fact, it was observed that there was a tendency to increase.

Table 2 Example 19 Commercially available 5LC 98% by weight, 81% by weight and C1% by weight were mixed and a guide roller for aluminum wire drawing was prepared in the same manner as in Examples 1 to 10. The sintering temperature at this time is 210
It was 0°C.

When the obtained guide roller was subjected to a comparison test for service life with commercially available guide rollers made of cemented carbide and alumina ceramic, the results shown in Table 3 were obtained, indicating that the guide roller of the present invention is extremely superior. has been proven.

The wire was moved at a speed of 15 m/m and at a temperature of 300°C.

Table 3 Patent applicant: Sumitomo Electric Industries, Ltd. Kazu 1) Akira, patent attorney

Claims (1)

[Claims] Contains 60% or more of SLC, and has 10 pores.
% or less, a plastic working tool for nonferrous metals and nonferrous alloys. f2] For SLC] 3, C, B, C, BN, B Yu03, AI, N B Yu, 80, Os, 8~C3
,^iN,'rt,c,DingLNJ,Bθ,Boo,
The plastic working tool for nonferrous metals and nonferrous alloys according to claim 1, characterized in that it contains 0.3 to 40% by weight of one or more of 5iSSLllN4, WG, and the like. (For 31sic, [elements of group 111, group ■a, group ■b, or their oxides, carbides, nitrides, borides,
The plastically processed shell for non-ferrous metals and non-ferrous alloys according to claim 1, characterized in that it contains 0.1 to 40% by weight of silicide.