JPS59211544A - Wear-resistant alloy and valve rocker arm - Google Patents

Abstract

PURPOSE:To obtain a valve rocker arm with superior wear resistance by forming a film of an Ni alloy contg. specified percentages of Cr, Fe, Si, B, C and Mo on the surface of the pad of a rocker arm. CONSTITUTION:A self-fluxing Ni-Cr-Fe alloy consisting of, by weight, 10.0- 12.0% Cr, 10.0-13.0% Fe, 6.0-7.0% Si, 2.0-2.5% B, 0.8-1.5% C, 4.5-5.5% Mo and the balance Ni is prepd. The alloy is sprayed on the surface of the pad of a rocker arm, and it is bonded by diffusion to form a film. Thus, wear resistance can be provided at a low cost with high productivity.

Description

[Detailed description of the invention]

The present invention relates to a wear-resistant alloy and a valve rocker arm formed on a t-pad surface with a coating made of this alloy. Recently, with the increase in the output of internal combustion engines, various internal combustion engine parts are required to have high wear resistance. Example Id Valve Rocker Arm Nonotsud '6 B
Since the pad slides and moves in contact with the cam surface of the camshaft, which is made of chilled cast iron, this pad surface is required to have a high degree of wear resistance. Conventionally, various wear-resistant treatments have been applied to this part, such as chrome plating and nitriding, but all of them have the disadvantage of poor wear resistance. In addition, wear-resistant self-governing alloy T is thermally sprayed on the pad surface and then heated! There is a method of forming an alloy film by attaching one layer to the other, but this self-governing alloy uses nickel as a base material and adds chromium (Or) 16~18X1 boron (B) 3~
4X, silicon (8i) 3.5-4.5%, carbon (0
) 0.5-1.0X. Iron (Fe) 5X or less Moripude 7 (Mo) 1-2%
This is a Ni-0r based alloy that contains 0.5% of adhesive wear due to the sliding action of the pad surface with the cam surface at low engine speeds. fill! There is a problem with 1%' with i. Recently, there is also a method of manufacturing a pulp puller arm by adding nickel, molybdenum, etc. to Fe-0r-based alloy and brazing FC special sintered alloy onto the notched surface. Due to the sliding action with the P engine, scratching wear occurs due to the high speed rotation of the engine.Also, this V% special sintered alloy has the drawback of being expensive due to the multi-step manufacturing process. In general, when the pad surface and the cam surface are used for sliding motion, there is a tendency that as the pad surface wears out, the cam surface of the mating member 1IBI also wears out. Therefore, it is desired that the pad surface be subjected to a wear-resistant treatment that is compatible with the pad surface, causing almost no wear on the notch surface itself, and hardly causing any wear on the cam surface. In view of the above points, the first object of the present invention is to provide an alloy with excellent wear resistance, and further, by forming a coating of this alloy on the band surface, the wear resistance of the pad surface is completely improved. A second object of the present invention is to provide a rocker arm having an L shape that can improve the wear resistance of the cam surface of the mating member. The alloy of the present invention uses nickel as a base material and chromium?
1l-10.0-12.0% by weight, iron i 10.0-1
3.0 weight 9', silicon weight 6.0~7. ON amount%, boron 20-2.5%, carbon'k 0.8-1.5%,
Ni-0r containing molybdenum'f 4.5-5.5%
It is made of a -re-based self-bathing alloy, and the function of each alloy component and the reasons for limiting the composition will be explained below. (1) Chromium Chromium combines with carbon to form chromium carbide dispersed in bands in the matrix of the alloy structure. The hardness of the carbide is HV100-1200,
Matrix hardness [HV700-900 higher, completely improves wear resistance. When the content of chromium 7 exceeds 12.0%, the dispersion rate of chromium carbide increases, forming alloy sebum (3)' on the pad surface (2) of the valve rocker boom (1) as shown in Figure 1. In this case, the IJ surface (4) of the camshaft which is the mating member
Scratching and abrasion noises occur, and when the content of OfU is less than 10%, the dispersion rate of chromium carbide decreases and the pad surface (2) wears out. Therefore, the content of chromium is 10.0 to 2.0% by weight.
shall be. (11) It strengthens the matrix of 9-alloy structure with 2 sockets and 7 solid baths in ferrous iron to prevent scratch wear on the pad surface (2) and prevent uneven wear on the cam surface, but its content is If the iron content is less than 10.0% by weight, scratching and abrasion sounds will not easily occur on the pad surface (2), and if it exceeds 13.0% by weight, uneven wear will occur on the cam surface (4). is 10
, 0 to 13.0% by weight. In addition, the addition of iron is applied to the skin R of the nototsudo surface (2).

It has the effect of preventing surface sagging at the edge of [3] and maintaining the shape of the film (3), and also has the effect of improving the polishing workability of the surface Tm of the film (3). (110 silicon silicon is nickel When combined with nickel silicide, a coumatric complex is formed. Silicon is a component that affects the hardness of the matrix, and if its content is less than 6.0% by weight, the hardness of the matrix will be H.
V700 or less, the wear resistance of the matrix is poor,
Moreover, if the hardness of the matrix exceeds 7,0 weight Xt-
Abrade the entire surface (4) of 900 or higher. Therefore, the silicon content is set to 6.0 to 7.0% by weight. Boron reacts with metal oxides during alloy melting to form B, o
There is a 7Lux effect that stands out on the surface as S and improves the alloy structure, but if the content is less than 2.0% by weight, the 7Lx effect is not significant and is 2.0 to 2.5% by weight.
The boron content is zO ~ 2.5!, since a sufficient slack effect can be obtained with 2.5% and there is no change in the flux effect even if the content is further increased. The amount is expressed as %. (V) Carbon Carbon is a component that combines with chromium to completely generate chromium carbide and improves i4 wear resistance, but if its content is less than 0.8% by weight, the formation of chromium carbide is insufficient; 5fi
The carbon content is set to 0.8 to 1.5% by weight because too many carbides are produced and the alloy structure becomes brittle. (VD molybdenum Molybdenum is an element that has self-lubricating properties, and has the effect of preventing adhesive wear <m), but its content is 4
．． If it is less than 5% by weight, there is no effect in preventing adhesive wear (,4,5
A sufficient anti-wear effect can be obtained at ~5.5% by weight, and there is no change in the effect even if the content is increased further, so the ownership rate of molybdenum is 4.5 to 5.5% by weight. do. Methods for forming a film (3) on the pad surface (2) with the alloy of the present invention include a method of thermal spraying and diffusion bonding on the pad surface (2) of the alloy, and a method of kneading the alloy powder and a plastic resin binder. There is a method in which a sheet-like RC is placed on the pad surface (2) and then heated in a bath, and all examples thereof will be explained below. Example 1 Nickel (Ni) is used as a base material, and 0r11 is added to it with N noble%.
%, Fe12% + S + 6.5%, 82.4%,
Ni-Or containing 01.0% and Mo5.0%
- After spraying approximately 0.6M of Fe-based self-bathing alloy powder (powder particles 100 ~ 350 mesh) onto the rad surface of the cipal blocker arm by plasma spraying, the bath was heated in a vacuum furnace. The spray particles are heated and welded to form an integral self-fusing alloy film, which is also diffusion bonded to the rocker arm base material. The surface of this self-fusing alloy film is polished to a thickness of 0.3
A stingy valve rocker arm finished with m-surface roughness of 2S was created. ○Plasma spraying conditions ○Vacuum furnace conditions Spraying current near 00A Heating temperature: 1000±5℃〃
Voltage: 27 V p Time: 10 minutes full r
Gas flow rate: 1OO8O'FHX Empty degree: 0.5
Torr powder feed rate: 3or/min Thermal spraying distance: ioo ■ Example 2 As a Nit base material, this was coated with a weight of 0r11.
5%, FelLO%, Si 6.5%, 82
．． 3%, OO, 9%. Acrylic resin as a binder material (acrylic resin 10%, alcohol 30%, water 60qb in volume range) to make a sheeter of Ni-0r-Fe self-fusing alloy powder (powder particles 100-350 mesh) containing Mo4.7% ) is mixed and kneaded in an amount of 10% by weight with the self-fluxing alloy powder of the present invention to form a slurry. This slurry-like self-fusing alloy is rolled and formed, and an acrylic resin binder is inserted between each self-fusing alloy powder particle.
This was combined into a sheet with a thickness of 0.7 rrrm, and then dried at 150°C for 30 minutes to volatilize the alcohol and water, resulting in the N i -Cr I! ” An e-based self-fusing alloy powder sheet was created. In order to use this self-fusing alloy powder sheet to form a film on the valve rocker arm surface, the entire sheet was cut into a valve rocker arm/seven-sided shape. Acrylic was applied to the pad surface. After bonding with a thread captivity, heat welding was performed to the valve rocker arm base material in a vacuum furnace.The acrylic resin was vaporized and removed at 300°C, and each one-bath alloy powder particle was integrated into the bath. A self-fusing alloy film of 0.51 filtration was formed on the pad restraint by forming a one-bath alloy layer and diffusion bonding with the rocker arm base material.The surface of this self-fusing alloy film was polished, and the thickness of the film was 0.3%
The valve rocker arm was completed with a surface roughness of 2S. The vacuum furnace conditions are a heating temperature of 1000℃±5℃ and a heating time of 1O.
Minutes, the ingredients were '2 degrees 0.5'rorr. Next, we combined the camshafts of Example 1.2 and those coated with conventional chrome plating, special sintered alloys, and Ni-0r-based self-bathing alloys with Fc30 chill-treated camshafts to increase the engine rotational speed. 100Or. A pliers wear test was conducted at 29 m. The results are shown in Figure 2, where a and al are the amount of wear on each surface of the pad surface and cam surface of the chrome-plated one.
b and b' are the wear percentage of each surface of special sintered alloy.
C+ C' is the amount of wear on each surface of the Ni-0r-based self-bathing alloy, d and d' are the amount of wear on each surface of the product of Example 1, s
e+e' represents the amount of wear on each surface of Example 2. As is clear from this, the pad surface and cam surface of Example 1.2 in which the film of the present invention alloy was formed had extremely less wear than the conventional ones, and the wear condition was observed after the test was completed. As a result, scratching and abrasion on the slit surface,
No patchy wear or adhesive wear was observed on the cam surface. As described above, according to the present invention, a Ni-0r-Fe-based self-bathing alloy with extremely excellent wear resistance is obtained, and by forming a film on the pad surface of the valve rocker arm using the sound of this alloy, it is possible to Compared to the wear-resistant treatment, the secondary wear resistance of the pad surface and the cam surface is improved, and it is also less expensive and has the effect of improving productivity.

[Brief explanation of drawings]

Fig. 1 is a side view of an example of the four-piece one-arm of the present invention, and Fig. 2 is within the line showing comparative data on the amount of wear. (1) Valve rocker arm, (2) Pad surface, (3) Film.

Claims (1)

[Claims] l Nickel is used as a base material, and chromium is added to it from 10.0 to 10.0.
12.0% by weight, total iron lO1θ~13.0% by weight, total silicon 6.0~70% by weight, boron i2. o~2.5N
, carbon 1f''0.8~1.5N, molybdenum'k 4.
A wear-resistant alloy consisting of a Ni-0r-Fe-based self-baking alloy containing 5 to 5.5%. 2 Using nickel as a base material, chromium gold 10,0 ~
12.0 weight x 1 steel 10.0-13.0 weight %, silicon Yc 6.0-7.0! iX, boron k 2.0-2
．． 5N, carbon tube〇, 8~1.5X1 molybdenum 4.
A valve rocker arm formed by forming a film of a Ni-0rFe-based self-bathing alloy containing 5 to 5.5% on a rocker arm pad surface.