JPS6086237A - Cu-alloy for slide member - Google Patents

Abstract

PURPOSE:To provide a copper alloy as a slide member excellent in strength, toughness and anti-wear property, obtained by adding a specific amount of Zn, Al, Sn, Ti, Zr and other elements to Cu. CONSTITUTION:10-43% of Zn, 2-8% of Al, 1.5-3.5% of Sn, 0.5-3% of one or more of Ti and Zr and 0.002-2% of one or more of Fe, Ni and Co are contained in Cu. Or, 0.2-3% of Mn or 0.05-1.0% of Pb is contained alone or in a combined form to prepare a copper alloy. By this method, a copper alloy suitable for a slide member required in high strength, high toughness and excellent anti-wear property used under a high load slide condition such as the synchronizer ring of an automobile is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Cu alloy that has high strength, high toughness, and excellent wear resistance, and is particularly suitable for use as a sliding member that requires these properties. Chiru.

Conventionally, sliding members used under high-load (high-speed and/or high-load) sliding conditions, such as synchronizer rings in automobiles, have traditionally been manufactured using M, in which hard particles such as various intermetallic compounds are dispersed. Cu alloys such as bronze and brass are used.

However, these conventional Cu alloys all have low strength.

Sliding members that are inferior in at least one of the properties of toughness and wear resistance and are therefore expected to be used under severe conditions that require them to have all of these properties. At present, when used in manufacturing, they exhibit only a relatively short service life, although they can exhibit sufficiently satisfactory performance over a long period of time.

Therefore, from the above-mentioned viewpoints, the present inventors have
As a result of conducting research to develop a material that has all the characteristics of toughness and wear resistance, Zn: 10 to 43'Z in weight % (all figures hereinafter indicate weight %).

AA-Sections 2-8.

Sn: more than 1.5% to 3.5%.

One or two of Ti and Zr, 20.5-3%.

One or more of Fe, ) H, and Co.

Contains, and if necessary, Mn: 0.2-3.

pb: o, os~1%.

Cu alloys containing one or two of these, and the remainder consisting of Cu and inevitable impurities, have high strength and high toughness.

The Cu alloy has excellent wear resistance and excellent wear resistance, especially when used in the manufacture of parts used under high-load sliding strips. This is the knowledge that tIn is exerted over a long period of time.

This invention was made based on the above findings, and the reason why the component composition range was limited to 5 degrees, which is determined by two people, will be explained below.

(a) Zn and M Zn, A, and e components are components that essentially determine the base structure of the alloy, and depending on their content, the structure changes to α+
It changes into β type, β type, and β + γ type, but exhibits excellent toughness when its structure is α + β type or β type. This α+β type or β type base structure is
These are obtained when Zn: 10 to 43 ratios and M: 2 to 8 ratios are contained, respectively. Therefore, when the contents of Zn and AA exceed Zn-43% and AA:8%, not only the embrittlement phenomenon due to γ phase precipitation appears, but also the strength of the alloy decreases. On the other hand, if Zn: less than 10% and M: less than 21, the α phase increases and the β phase decreases, making it impossible to ensure the desired wear resistance.
and M content respectively Zn: 10-43 ratio 9M:
It was set at 2-8.

(b) sn, T1 and Zr, Fe, Ni, and C.

These components consist of Ti, which is extremely finely dispersed in the matrix.
5Sn3, Zr5sn3, and (Ti, Z
r) 5Sn3 type intermetallic compound, and (one or more of Fe, Ni, Co) and (one of Ti and Zr) which are somewhat coarse grained compared to this intermetallic compound.
The former (Ti, Zr)5Sn3 type intermetallic compound mainly improves the alloy strength, and the latter (we,
N1. Co) (Ti, Zr) type intermetallic compound that mainly has the effect of significantly improving the wear resistance of the alloy.
1.5% or less, T1 and Zr: less than 0.5%, (
The amount of Ti, Zr)sSna type intermetallic compound was insufficient to ensure the desired high strength;
n: 3.5%, Ti and Zr: Even if the content exceeds the third factor, no further effect on strength improvement can be obtained, but rather machinability and hot workability tend to deteriorate. In addition, when the content of Fe, Ni, and CO is less than 0.02, the (Fe, Ni, Co) of a given scene is
(Ti, Zr) type intermetallic compounds cannot be formed, and therefore the desired wear resistance improvement effect cannot be secured. On the other hand, when the content of Fe, Ni, and Co is Even if the content exceeds Eln: more than 1.5%-3, Eln: more than 1.5%, and Eln: more than 1.5%, respectively, because not only will no further effect be achieved due to improved wear resistance, but also the stiffness of the alloy will deteriorate. 5(1), Ti and Zr: 0.5-3%, Fe, Ni.

and Oo: 0.02 to 2.

(c) Mn The Mn component has the effect of forming a solid solution in the base material, strengthening it, and stabilizing the alloy structure against thermal history. It is included as necessary when stable properties are required, but if the content is less than 0.2 parts, the desired effect of improving the properties cannot be obtained, whereas if it is contained in more than 3 parts, Since oxide slag is easily generated during alloy melting and the integrity of the ingot is impaired, the content k was set at 0.2 to 3.

(d) pb The Pb component has the effect of uniformly and finely dispersing in the grain boundaries and improving the machinability of the alloy, as well as improving workability by dividing the shape of chips into small pieces, so it is especially important. It is included as necessary when excellent rigidity is required, but if the content is less than 0.05%, the desired machinability improvement effect cannot be ensured, and on the other hand, if the content exceeds 1%, However, if the content is reduced to 0, the hot workability will decrease.
It was set as 05-1ch.

Next, the Cu alloy of the present invention will be specifically explained using examples.

Example Using a conventional high-frequency furnace, in a graphite crucible, in the atmosphere, under charcoal coating, the present molesters 1 to 23 and comparative alloys 1 to 7, each having the composition shown in Table 1, were prepared. Each was melted and cast into a mold, with an upper end diameter of 70 mm.
After making an ingot with dimensions of φ x lower end diameter: 60wTlφ x height: 160mm, a solidifying agent was applied to the ingots except for comparative Cu alloys 2 and 4, which were embrittled due to T phase precipitation and caused casting cracks. Then, hot blooming forging was performed at a temperature of 50° C. to form a billet with a diameter of 60 mm, and a solidifying agent was applied again to form a billet with a diameter of 55 mm.

Next, for the billets of Cu alloys 1 to 23 of the present invention and comparison u alloys 1, 3, and 5 to 7 obtained from this experiment, in order to see the effects of these Cu alloys on cutting tools, : Made of WC-based cemented carbide.

Cutting speed: 220m/min.

Depth of cut: 0.5mm.

Transmission V): fQ, 08 mm/rev.

Cutting time: 15m1n.

No oil.

All continuous cutting tests were conducted under these conditions, and the flank wear width of the tool cutting edge was measured.

Also, from the billet after the above cutting test, the parallel length:
30mm, parallel part diameter: 6g tensile test piece, and JT
, a No. 84 impact test piece was cut out and subjected to a tensile test and an impact test.A pin test piece with a tip diameter of 2 mm was also cut out and a pin-on-disc type abrasion tester was used to test the disc material: Carburized and quenched JXB-BCM-21 (O
r-Mo steel, hardness: HBO23).

Friction speed: 0.3 m/sec.

Contact pressure 250/C? ! .

Sub distance: IK2M.

A dry wear test was conducted under the following conditions, and the wear volume (specific wear amount) per unit pressure and unit sliding distance was measured. These measurement results are also shown in Table 1.

From the results shown in Table 1, it can be seen that the Ou gold alloy of the present invention has very little wear on the cutting tool and has good rigidity, while the comparative Cu alloys 1, 3 and 5 to 7 have If the content of any of the constituent components (marked with * in Table 1) falls outside the scope of this invention, at least one of the above properties will be inferior. is clear.

As mentioned above, the Ou gold alloy of the present invention has high strength, high toughness, and excellent wear resistance, so when used as a sliding member that requires these characteristics, it can be used for an extremely long period of time. It exhibits excellent performance throughout.

Applicant: Mitsubishi Metals Corporation Agent Tomi 1) Kazuo and 1 other person

Claims (1)

[Claims] (]) Zn: 10-434y. 842-8%. Sn: more than 1.5 cycles to 35%. 1 or 2 of T1 and Zr 205-3%. 5 units of Fe, 1, and Co, 1,000 tons, 21 weights or more, Uni 0.02 to 2 units. A Cu alloy for sliding members, which is patented as having a composition (weight %) in which the remainder T2 consists of CI2 and unavoidable impurities. (2) zn: ] O-43%. Sections 4.2-8. Sn: more than 1.5'16 to 3.5%. One or two of T1 and Zr, 0.5-3
%. Fe, N1. and one or more of Co:
0.02-2%. Further, Mn: 0.2 to 3. 1. A Cu alloy for a sliding member, characterized in that it has a composition (hereinafter referred to as M amount), with the remainder consisting of Cu and unavoidable impurities. (3) zn: 10-43 section. Ag: Sections 2-8. Sn: more than 1.5% -3.5%. One or two of T1 and Zr: 0.5=3
Person in charge. One or more of pe, Ni, and CO: 0.02 to 2. Contains all pb: o, os ~ engineering staff. 1. A Cu alloy for a patented material, characterized in that it has a composition (in terms of weight) of which the remainder is O and unavoidable impurities. (4) Zn: Sections 10-43. M, Sections 2-8. Sn: more than 1.5% to 3.5%. One or two of T1 and Zr, 20.5 to 3. One or more of Fe, Ni, and CO:
0.02~2φ. Further, Mn: 0.2 to 3. Pb: 0.05 to 1 section. A sliding part-use Cu characterized by having a composition (above t%) consisting of Cu and unavoidable impurities.
alloy.