JPS59150016A - Sliding member for internal-combustion engine - Google Patents

Abstract

PURPOSE:To provide a sliding member for an internal-combustion engine having wear resistance at a low cost by disposing a cast iron chip in the sliding part of a steel member, and irradiating a high density beam to the chip to remelt and harden the same thereby bonding both. CONSTITUTION:A cast iron chip 2 is placed on the sliding part (cam nose part) of a steel base material 1 forming a cam shaft, etc. A high density beam such as an electron beam, TIG arc or the like is irradiated to the chip 2 from a direction B to remelt the chip 2 so that the chip is chilled and hardened. The irradiation heat is, at the same instant, penetrated in the surface layer part of the material 1 to alloy the boundary part between the chip 2 and the material 1. A sliding member for an internal-combustion engine having high wear resistance is thus completed at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a member for an internal combustion engine that has sliding parts that require wear resistance.

Parts used in internal combustion engines and having sliding parts, such as camshafts, rocker arms, tappets, valves, and valve seats, are required to have extremely high wear resistance. Regarding conventional such members, for example, in the case of a camshaft, the cam part and the shaft part are integrally formed at the same time by casting or forging, and in the case of casting, a cold metal is arranged in the part corresponding to the cam nose of the mold. In the case of J: type forging, the cam nose part was quench-hardened by high frequency. However, in the case of the previous method, a deburring process was necessary because deburring was generated, and the number of manufacturing steps was increased due to the installation and collection of cold metals, which resulted in high costs. Also, in the latter case, the wear resistance is low, and depending on the usage conditions, -C may not be easily usable.
Ta.

In addition, in recent years, after manufacturing the seat 71 ~ part with steel pipes and manufacturing the cam part as the sliding part with high wear resistance, the two are integrally connected. Although a shaft has been devised, there are still many manufacturing steps involved in this January match, and the problem of high costs still remains.

In view of the above, the present invention is limited to Kamshito l-. In various sliding members for internal combustion engines, the matrix portion that occupies most of C is Sujiruo, and the sliding part is provided with a 5Ji button and a moon. We provide sliding parts with high wear resistance.
It is something that

Hereinafter, the present invention will be explained in detail based on the drawings. Figure 1 shows J3, and 1 is the steel material that makes up most of the camshaft.
, : The base material 42 is shown as a whole, and the whole shows the state in which the cast iron material chip 2 is placed on the cam nose part of the base material 1. In this state, an electron beam from direction B, TIG Argu Iq
The chip 2 is irradiated with a high-density beam of -C, and the entire chip 2 is irradiated by moving the beam irradiation source or moving the part t.

FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and as shown in the figure, the cast iron chip 2 is thin with a thickness of 0.5 to 3n++++. By making the cast iron depth into a thin piece like the mouth, the high-density beam not only avoids chill hardening by remelting the chip, but also allows the heat from the radiation to penetrate into the surface layer of the steel base material. The surface layer (, ) is activated, and therefore the boundary between the cast iron No. 4 bup 2 and the steel base material 1 is
Alloy bonded by diffusion of component elements. In this way, the cast iron chip and the steel base (Δ) are firmly integrated.

After the surface treatment, some undulations and sagging will occur on the surface of the depth (Δ). The sliding member is completed.

The method for manufacturing the A8 according to the present invention described above can also be applied to sliding parts such as sliding members for other internal combustion engines, tappets, rocker arms, etc.
An example of application to a cylindrical tappet is shown in Fig. 3, and an example of application to a rocker arm is shown in Fig. 4.

Figure @5 is a 200x magnified micrograph that does not show the boundary after the steel base material and cast iron A chip have been bonded.
The part (cast iron chip, 1) is the boundary, and the part C (
The base material is steel. It can be seen that the boundary portion with a constant width is an alloy layer.

The good workability and low cost of steel materials such as remelted and hardened cast needles, high 1M1 steel materials, and forged steel materials are well known, and the present invention (using a manufacturing method more than that) is well known. As a result, a sliding member for an internal combustion engine with low cost, high durability, and high durability has been realized.

[Brief explanation of the drawing]

Fig. 1 is a front view when the depth is placed at the 7-z position on the cam shirt 1, Fig. 2 is a sectional view taken along line A-Am in Fig. Fig. 4 is a vertical cross-sectional view when applied to ~, and Fig. 4 is a Kt applied to a rocker arm.
It is a lJi plane view. In addition, Fig. J5 is a 200x magnified microscopic photograph showing the boundary between steel P:IIA and the cast iron chip. Explanation of symbols 1.1', 1''...base material part, 2.2'', 2''...
Cast/iron depth. Patent applicant Nippon Piston Ring Co., Ltd.

Claims (1)

[Claims] After placing the cast iron A bup on the sliding part of the steel base material,
A sliding member for an internal combustion engine, which is obtained by irradiating the sliding part with a high-density beam to re-melt and harden the cast iron chip, and by alloying the base material and the chip.