JPS6053433B2 - Manufacturing method for sliding members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sliding member used in electric brushes, etc., in which metal-coated carbon fibers are arranged in a bundle in one direction.

More specifically, metal-coated carbon fibers are used, they are aligned in one direction to form a bundle, and the fibers at one end are joined and integrated, while the fibers at the other end maintain an independent state and slide. The present invention relates to a method of manufacturing a flat sliding member. The present inventors first aligned metal-coated carbon fibers (hereinafter abbreviated as MCCF) in one direction to form a bundle, one end was heat-pressed and integrated, and the other end maintained an individual fiber state. Mama,
We proposed a sliding member such as an electric brush that is used with fibers standing upright against the sliding surface.

Since this sliding member has excellent current carrying ability, it can be used as a brush for electric motors or as a neutralizing brush for copying machines.

The sliding member is manufactured by arranging MCCFs in one direction and forming the fibers by heating and pressurizing only the other end and diffusion bonding without heating and pressurizing the fibers at one end.

Conventionally, when molding a composite material from MCCF, the MCCF was laminated in individual molds, metal powder, etc. were added as needed, and heat and pressure were applied.

Molding the sliding member using this method is extremely inefficient and expensive. The present inventors have arrived at the present invention as a result of studying these problems.

That is, the present invention is a sliding member made of MCCF, in which the fibers are aligned in one direction to form a bundle so that they stand upright on the sliding surface, and the other end is bundled while maintaining the fiber state on the sliding surface. In a method for manufacturing a sliding member by heat-pressing, a quantity of MCCF that can be molded into a plurality of sliding members is arranged, and portions corresponding to the heat-pressing ends of the sliding members are simultaneously heat-pressed at adjacent positions, This method of manufacturing a sliding member is characterized in that the sliding member is then cut into individual sliding members.

Manufacturing a sliding member by such a method results in low cost and allows the same product to be manufactured in large quantities.

In the present invention, MCCF is 0.1 to
It is a fiber having a metal layer with a thickness of about 4 μm, and the types of metals include Al, Cu, Ag, Au, Zn, Sn,
It is a fiber having a layer of conductive metals such as Mg, Fe, Ni, CO, and Cr, alloys thereof, or a combination of two or more of these metals, and has been proposed by the present inventors in Japanese Patent Application Laid-Open No. It can be obtained by a method typified by ion brating as described in Japanese Patent No. 53-66831.

MCCF obtained by ion blasting has a uniform metal film and is therefore particularly excellent in electrical conductivity. The carbon fiber serving as the core material is a so-called carbon fiber in the commonly used sense, and either carbonaceous or graphite may be used. A sliding member using such MCCF has been proposed, for example, in Japanese Patent Application No. 146541/1983.

This sliding material will be explained with reference to the drawings. FIG. 1 shows a conceptual perspective view of a sliding material which is the object of the present invention. In FIG. 1, 1 is an MCCF and 2 is a sliding surface.

MCCF is aligned in the direction perpendicular to the sliding surface,
The part on the sliding surface side of the I-1" line (hereinafter referred to as the sliding end) retains each MCCF as an independent fiber and has flexibility. On the other hand, the part on the back side of the I"-1" line The part (hereinafter referred to as the fixed end) is one in which each MCCF is diffusion-bonded to each other by a coated metal material, the sliding material is gripped by this part, and a terminal for energization is provided.Sliding The packing density at the end is 5 to 70%, preferably 10 to 40%, and the packing density at the fixed end is 90 to 100%.

If the packing density at the sliding end is increased, the metal coating will be removed during sliding. The metal may fuse together, causing poor contact at the sliding part. Further, as another sliding member, a structure as shown in FIG. 2 may also be employed.

Figure 2 A: A metal material 3 is simultaneously diffusion-bonded to the fixed end.This metal material 3 improves workability, and also makes terminal bonding easier and eliminates the need for a current-carrying cap. . The metal material used here is preferably the same as the coating metal of the MCCF, or one that does not melt during molding and has a high current carrying capacity. To name a few, Cu, Ag,
Al, Fe, etc. In such a method of manufacturing a sliding member, fixed ends are formed by heating and pressing a plurality of sliding members at positions where the fixed ends are adjacent to each other.

It is then cut into individual sliding members. The manufacturing method is specifically shown in the drawings. FIG. 3 shows a conceptual diagram when MCCFs are aligned in one direction. FIG. 3 shows a case in which MCCFs of an amount equivalent to four sliding members are aligned on a plane L. The shaded portions of the MCCFs aligned in this manner are heated and pressed to be diffusion bonded, thereby molding the equivalent of four sliding members at the same time. Then, by cutting along the dotted lines in the figure, four sliding members will be obtained. A good method is to provide a convex portion on the mold at a position corresponding to the dotted line to facilitate positioning. Even if the number increases, they will be molded in the same way.

A sliding member with a metal material bonded to the fixed end can be obtained by further placing a metal plate or the like in the shaded area and heating and pressurizing it at the same time.

The bonding of the coated metal by heating and pressure is preferably performed at a temperature lower than the melting point of the coated metal and higher than one-half of the melting point of the metal expressed in absolute temperature.

If the temperature is higher than the melting point, the coating metal will melt, which is undesirable because the bond may extend to the sliding end or the coating metal may come off. If the heating temperature is lower than the lower limit temperature, the bonding will be insufficient. When a metal material is joined to the fixed end and this metal material is different from the covering metal, the lower limit temperature is the same, but the upper limit temperature is set higher than the liquid phase appearance temperature of the phase diagram combining the different metals. Something is needed.

The pressure can be changed depending on the temperature, but it is 1 to 200k9/
The higher the temperature within the CI range, the lower the pressure can be used for bonding.

If the pressure exceeds 200 kg/c, the carbon fibers tend to break, which is undesirable and impractical. The heated and pressurized atmosphere is a vacuum inert gas (e.g. Ar, N2), reducing gas (
For example, it is preferable to use H2). As described above, according to the method of the present invention, a large number of sliding members can be manufactured simultaneously, and the sliding members thus obtained are homogeneous and have little variation among individual members. Example 1 A molded article for manufacturing a sliding member having the shape shown in FIG. 4 (the shape of one sliding member corresponds to the shaded area and is shown in FIG. 1).

) in the mold shown in Figure 5 by ion blasting.
．． Carbon fibers with a diameter of 7 μm (MCCF diameter of 9 μm) coated with 0 μm were arranged side by side. The dimensions of the mold are a square with an inner dimension of 150Tfn width x 14" length, and the length of part A is 33W! , The length of the B part is 23T! r! ! The length of the L and C sections is 12 m. Part B and part C are recessed four times more than part A. A
The slope is 30 degrees from part B to part C. After molding, the thickness of the fixed end is 4? when the filling density is 100%? MCC that just becomes
The mold charged with F was placed in a vacuum hot breath.

460℃, 100k at 1×10-4t0rr vacuum
9/Clt for 5 minutes.

The resulting product had the shape shown in Figure 4. This corresponds to the center of parts A and B in Figure 5.
Cut into 4 pieces along line and bb'' line, each 1-1
A total of 16 sliding members were created by cutting them into four equal parts and grinding them along the ``line'', 2-2'' line, and 3-3'' line.The size of each piece was 34?
Width x 32m width length, sliding end thickness 12Tn1. (filling density feather%), the thickness of the fixed end is 4Tfa (filling rate 100%)
).

Also, the length of the sliding end is 101!1 Jft1, and the length of the fixed end is 15
? The angle of the slope was 30 degrees.

This sliding member was slid against a glass roller, which is a light source of a copying machine, to remove dust.

It has good dust removal efficiency and excellent heat resistance, allowing it to be used for a long time.

[Brief explanation of the drawing]

FIG. 1 is a perspective conceptual diagram of the sliding member of the present invention, FIG.
The opening is a perspective view showing another embodiment, FIG. 3 is a conceptual diagram of metal-coated carbon fibers aligned in one direction, FIG. 4 is a perspective conceptual diagram of a molded body for manufacturing a sliding member, and FIG. 5 is a molded body. A cross-sectional conceptual diagram of a mold for use. 1: MCCF, 2: Sliding surface, 3: Metal material, 4, 5: Male mold, 6: Female mold.

Claims (1)

[Claims] 1 A sliding member made of metal-coated carbon fibers, in which the fibers are aligned in one direction to form a bundle so that they stand upright on the sliding surface, and the fibers are bundled while maintaining the fiber state on the sliding surface. In the production of sliding members whose ends are heat-pressed, metal-coated carbon fibers in an amount that can be formed into multiple sliding members are arranged, and the parts corresponding to the heat-pressed ends of the sliding members are simultaneously placed at adjacent positions. A method for producing a sliding member, which comprises heat-pressing and then cutting into individual sliding members.