JPH07116928A - Manufacture of facing material - Google Patents

Abstract

PURPOSE:To manufacture easily and inexpensively a facing material by which the possibility of separation of a friction material is eliminated and which has excellent friction performance and mechanical characteristics. CONSTITUTION:After slits 1 passing penetratingly in the thickness direction are arranged in a core plate 2, a coating layer of an organic coating agent containing an inorganic friction adjusting material and a reinforcing material is formed on a surface of the core plate 2. Thereby, the slits 1 as an oil groove can be formed at press work time of the core plate 2. The slits 1 are excellent in moving efficiency of the oil content, and are effective as the oil groove. Since the coating layer containing the inorganic friction adjusting material and the reinforcing material is formed, a friction surface can be easily formed, and a problem of separation of the friction surface is not caused. Since the reinforcing material can be oriented at random, strength of the friction surface is heightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a facing material, and more particularly, to a facing material useful as a friction member of a device having a friction mechanism such as a wear-resistant material for machines and home electric appliances, a facing material for automobiles and the like. Manufacturing method.

[0002]

2. Description of the Related Art Conventionally, a friction material of this type is generally prepared by forming a composition containing a filler or fiber exhibiting friction performance into a sheet by papermaking, rolling or press molding, and adhering it to a metal plate material serving as a core plate. The obtained sheet-shaped friction material is manufactured by punching or cutting into a facing material having a desired shape such as a circular shape or a ring shape.

By the way, since the facing material is used in oil, it is necessary to form an oil groove in order to remove the oil component from the friction surface during pressurization. Conventionally, the oil groove of the facing material is formed by cutting the sheet-shaped friction material on the core plate or pressing the core plate itself into an uneven shape for groove processing.

[0004]

The above-mentioned conventional manufacturing method has a poor material yield because it is processed into a facing material by punching or cutting.

Further, regarding the friction material itself, in the case of papermaking, it is difficult to obtain a friction material having stable properties because the fillers and fibers are not uniformly added, mixed and dispersed. In particular, when the fibrous filler is dispersed, it is difficult to orient it in a good direction, which may lead to large variations in physical properties such as strength. Further, in the case of forming, particularly in the case of forming a sheet by roll hot forming of an organic material, it is difficult to produce a sheet having a uniform thickness and surface condition, and the work is complicated.

In addition, the conventional method of adhering a sheet-shaped friction material to a core plate involves many manufacturing steps, resulting in high manufacturing cost, and there is a problem of peeling of the friction material.

Further, among the conventional methods for forming the oil groove of the facing material, the cutting method of the sheet-like friction material is easy to groove but has a problem in durability, and is not sufficient as an industrial material. On the other hand, in the groove processing by pressing the core plate, the escape of the material of the recess moves to the friction surface, and the friction surface becomes uneven. For this reason, it is necessary to make the friction surface flat by further processing (grinding) after the press working, and it is unavoidable that the cost is high.

The present invention has the above-mentioned conventional problems, that is, the punching yield of the friction material is poor. The step of adhering the friction material and the core plate is complicated, and there is a problem of peeling of the friction material. It is difficult to form a high-performance friction material. It takes time to process oil grooves. Overall, there are many manufacturing processes and the cost is high. The problem is solved, there is no fear of friction material peeling,
An object of the present invention is to provide a method capable of easily and inexpensively producing a facing material having excellent friction performance and mechanical properties.

[0009]

A method of manufacturing a facing material according to claim 1 is a method of manufacturing a facing material in which a friction surface is formed on a surface of a core plate, wherein a slit penetrating the core plate in a thickness direction thereof. Is provided, a coating layer of an organic coating agent containing an inorganic friction modifier and a reinforcing material is formed on the surface of the core plate.

A method of manufacturing a facing material according to claim 2 is
The method of claim 1, wherein the inorganic friction modifier is one or more selected from the group consisting of alumina particles, molybdenum disulfide particles, and carbon particles, the reinforcing material is carbon fiber, and the organic coating agent is polyamide. It is an imide resin and the thickness of the coating layer is 10
˜300 μm.

The present invention will be described in detail below.

In the method for manufacturing a facing material of the present invention, as the material of the core plate, a lightweight metal such as aluminum or titanium or an alloy thereof, iron, or an iron-based alloy can be used. Specific examples of these alloys include Fe-Ni alloys, Fe-Cr alloys, Al-Mg alloys, Al-Mn alloys, Ti-Al alloys, and Ti-Fe alloys.

First, such a core plate is pressed into a desired facing material shape. When this press processing is performed, a slit penetrating in the thickness direction of the core plate is formed at a predetermined position.

The shape and size of this slit, the number of formed slits,
The forming position and the like are appropriately determined according to the size, shape, application, etc. of the facing material, but generally the outer diameter is 80 to 130 m.
m, an inner diameter of 40 to 80 mm, and a thickness of 1 to 5 mm, a ring-shaped facing material has a length of 10 to 20.
It is preferable that about 5 to 30 slits having a width of about 1 mm and a width of about 4 mm are radially evenly arranged.

After pressing, the core plate is generally subjected to barrel polishing for deburring and primer treatment for anticorrosion according to a conventional method.

In the present invention, an organic coating agent containing an inorganic friction modifier and a reinforcing material on the surface of the core plate, which has been processed into a predetermined shape by press working and has slits formed in this way, in general, both front and back surfaces. To form a coating layer.

Here, it is preferable to use a polyamide-imide resin as the organic coating agent, and as the inorganic friction modifier, one kind of alumina particles, molybdenum disulfide particles and carbon particles may be used alone or in combination of two or more kinds. It can be used in combination. Fibers such as carbon fibers are used as the reinforcing material. The carbon fiber functions not only as a reinforcing material but also as a frictional property holding material, and is suitable for the present invention.

Of these inorganic friction modifiers and reinforcing materials, the inorganic friction modifiers such as alumina particles have an average particle size of 0.
As the reinforcing material such as carbon fibers, short fibers having an average fiber length of 5 to 100 mm and an average fiber diameter of 2 to 10 μm are preferable.

Further, if the amounts of these inorganic friction modifiers and reinforcing materials used are too small, sufficient friction performance and strength cannot be obtained, and if they are too large, the surface strength of the coating layer obtained tends to decrease. , With respect to the total weight of the organic coating agent, the inorganic friction modifier and the reinforcing material,
The total proportion of the inorganic friction modifier and the reinforcing material is 10% by weight or less, particularly 2 to 5% by weight of the inorganic friction adjusting material and 3 of the reinforcing material.
It is preferably about 5% by weight.

In the present invention, the method of coating the organic coating agent containing the inorganic friction modifier and the reinforcing material is not particularly limited, and a spraying method or a spraying method,
A known coating method such as a dipping method can be adopted. After the coating, baking treatment is performed according to the organic coating agent used.
Normally, the baking conditions are 130 to 200 ° C. and 10
It is about 60 minutes.

If the thickness of the coating layer thus formed is too thin, the strength of the friction surface will be insufficient, and if it is too thick, the friction surface will be unnecessarily elastic, which is not preferable.
Therefore, the thickness of the coating layer is 10-300μ.
m, especially 20 to 200 μm, especially 30 to 100 μm
It is preferably about the same.

In the present invention, prior to the formation of the coating layer, the surface of the core plate after pressing is coated with a coating layer by sandblasting or shot blasting to roughen the surface. This is preferable since the adhesion strength of the layer can be remarkably increased.

In addition to the inorganic friction adjusting material and the reinforcing material, the coating layer may contain other additives such as a lubricant and a cleaning material.

[0024]

According to the method of the present invention, the slits as the oil grooves can be formed at the time of pressing the core plate, and a separate process for forming the oil grooves is unnecessary. When forming these slits, there is no problem of non-flatness of the friction surface due to the escape of the material at the time of processing unlike the oil groove of the conventional concave groove, and the oil transfer efficiency is good, It is effective in improving the characteristics.

By forming the coating layer of the organic coating agent containing the inorganic friction adjusting material and the reinforcing material on the core plate having such slits, the friction surface can be easily formed, and moreover, the friction surface can be formed against the core plate. The adhesion and adhesion of the coating layer are extremely high, and there is no problem of peeling off the friction surface.

In forming the coating layer, it is possible to uniformly disperse the reinforcing fibers and the inorganic friction modifier in the coating layer and at the same time to orient the reinforcing fibers randomly. On the other hand, it is possible to form a friction surface having sufficient strength, no problem of cracking or peeling, and good friction performance.

In the present invention, since the coating layer can be made relatively thin, its baking process can be easily performed.

[0028]

EXAMPLES The present invention will be described more specifically with reference to Examples and Comparative Examples below.

Examples 1, 2 Iron (S45C) plates were press-worked as shown in FIG.
A core plate 2 having a ring shape with a thickness of 2 mm, an outer diameter of 80 mm and an inner diameter of 50 mm, and provided with eight slits 1 having a width of 2 mm and a length of 8 mm radially was manufactured. After this press working, burrs were removed by barrel polishing, and a primer treatment was applied to prevent corrosion.

Alumina fine powder (average particle size 3 μm), molybdenum disulfide fine powder (average particle size 10 μm), carbon fine powder (average particle size 20 μm) were used as inorganic friction modifiers, and carbon was used as a reinforcing material and friction property holding material. Using fibers (average fiber length 20 mm, average fiber diameter 5 μm), Table 1
The mixture is mixed with the polyamide-imide resin in the proportion shown in to form a coating liquid, which is sprayed on both sides of the core plate by a spray method, and then baked at 330 ° C. for 10 minutes (Example 1) or 30 minutes (Example 2), A coating layer having the thickness shown in Table 1 was formed.

With respect to the obtained facing material, the wear amount (wear amount after 1000 cycles of sliding test with the S45C material as a mating material) and the friction coefficient were investigated, and the results are shown in Table 1. Further, the quality of the oil-removing property was evaluated in three grades of good = ◯, normal = Δ, and bad = ×, and the results are shown in Table 1.

Comparative Example 1 For comparison, a conventional paper-based facing material (paper thickness: 500 μm) was examined for wear amount, friction coefficient and oil scavenging property in the same manner as above, and the results are shown in Table 1.

[0033]

[Table 1]

From Table 1, it can be seen that the facing material produced by the present invention is superior in durability and frictional characteristics to the conventional products.

[0035]

As described in detail above, according to the method for producing a facing material of the present invention, the friction coefficient is good and the friction performance is excellent, and there is no problem of peeling of the friction surface, abrasion resistance and mechanical properties A facing material excellent in strength and durability can be easily manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing a core plate manufactured in Examples 1 and 2.

[Explanation of symbols]

 1 slit 2 core plate

Claims (2)

[Claims] 1. A method for producing a facing material in which a friction surface is formed on the surface of a core plate, wherein after providing a slit penetrating in the thickness direction of the core plate,
A method for producing a facing material, comprising forming a coating layer of an organic coating agent containing an inorganic friction modifier and a reinforcing material on the surface of the core plate. 2. The method according to claim 1, wherein the inorganic friction modifier is one or more selected from the group consisting of alumina particles, molybdenum disulfide particles, and carbon particles.
The method for producing a facing material, wherein the reinforcing material is carbon fiber, the organic coating material is polyamide-imide resin, and the thickness of the coating layer is 10 to 300 μm.