JP2905732B2 - Brake lining material for conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake lining material used for a braking device for a conveyor such as a belt conveyor.

[0002]

2. Description of the Related Art Conventionally, organic lining materials and metallic lining materials have been used as brake lining materials for conveyors. The organic lining material is a material obtained by hardening a friction material using a resin as a binder. For example, inorganic fibers such as asbestos fibers, organic fibers, metal fibers and inorganic powder such as calcium carbonate, and further, copper (Cu), zinc Z
n), a material obtained by mixing a metal powder such as lead (Pb), a wire, a chip, and the like, and hardening with a phenol resin or the like is used. The metallic lining material is a material obtained by solidifying a friction material or a lubricant with a sintered alloy.
A material is used which is obtained by sintering a graphite powder of less than 10% by weight and a silica powder of several wt% with a copper powder containing about 10 wt% of iron powder.

[0003] However, in recent years, as the speed of the conveyor has been increased and the operating conditions have become severer, the required characteristics of a brake lining material have become extremely severe. The brake lining material comes into contact with the sliding surface and reduces the sliding speed due to friction when a load is applied. In addition, the brake lining material must be able to withstand repeated use several thousand times.

[0004] For this reason, the brake lining material is required to have durability to withstand a large frictional force even if it is repeatedly applied. At the same time, the sliding surface of the mating material must not be damaged, and the grinding action for abrading the mating material must be minimized.

[0005] The coefficient of friction is required to be stable at a high temperature without largely changing in withstanding a temperature rise or a load due to repeated use. As for durability, it must have heat resistance as well as strength and wear resistance.

[0006] In particular, a conveyor requires a large braking force due to an increase in the weight of a conveyed material, and a brake lining material for a conveyor requires a large strength, abrasion resistance, heat resistance, a stable coefficient of friction, and the like. Is required.

[0007]

However, the organic lining material hardened with a phenol resin, which is conventionally used, is inexpensive, but has a low strength, a large amount of wear under a large load, and the friction coefficient decreases immediately. . In particular, 30
When the temperature exceeds 0 ° C., the phenol resin as a binder is carbonized or decomposed, so that the friction coefficient is sharply reduced and the wear resistance is also significantly reduced.

[0008] Even in the case of a conventionally used metallic lining material, a brake lining material to which a large load is applied has a large temperature rise, and a material to be braked (hereinafter referred to as a mating material).
And seizure, both themselves and others.

For this reason, in the conventional brake lining material, the period during which it can be used with a stable friction coefficient is short, and it has to be regularly replaced with high frequency.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a bearing capable of withstanding a large load, maintaining a stable coefficient of friction, having abrasion resistance, and further suppressing abrasion of a mating material. It is intended for a brake lining material.

[0011]

A means for solving this problem is to use a metal powder containing copper or a copper alloy as a main component and iron and titanium as a matrix, in which a refractory material powder and a graphite powder are mixed. This is a brake lining material sintered and sintered, and is a conveyor brake lining material described in the following (1) to (3) .

(1) Copper, copper alloy, iron and titanium powder
Metal powder consisting of iron powder and titanium powder
Is 20 wt% to 40 wt% of the metal powder, and the balance is
Is copper, copper alloy or a metal powder in which these are mixed
Finally, refractory powder of 10 wt% to 20 wt% of the whole
Powder and 15 wt% or more and 25 wt% or less of graphite powder
Conveyor shakers sintered in a uniformly mixed state
-It is a lining material .

(2) The titanium powder is the iron powder in a weight ratio.
The conveyor described in (1), which is not less than 0.2 and not more than 0.5 at the end
It is a brake lining material .

(3) The refractory powder is silica sand.
Or the brake lining material for conveyors described in (2)
It is .

[0015] Delete full text

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the main component of a brake lining material is a metal powder mainly composed of copper or a copper alloy, which serves as a matrix and is sintered in a state where the refractory material powder and the graphite powder are uniformly dispersed. ing. The metal powder matrix has much higher strength than the phenolic resin, has excellent wear resistance, and also has excellent heat resistance, and its strength hardly changes in a temperature range from room temperature to several hundred degrees Celsius.

In addition, since the copper base metal follows the surface shape of the mating material and adapts well, the contact area is large, the frictional force is increased, and the braking effect is large. Bronze (Cu
-Sn), brass (Cu-Zn), white copper (Cu-Ni),
Nickel silver (Cu-Ni-Zn) or the like can be used, but copper and nickel silver are expensive and bronze and brass are practical.

Since refractory materials are generally harder than metals,
When the refractory powder is mixed, the friction coefficient of the lining material increases. Moreover, the refractory material is chemically and physically stable at high temperatures above 1000 ° C. Therefore, by mixing the refractory material powder in the matrix, the lining material is prevented from being worn, and the friction coefficient can be maintained even under a high pressure, and the friction coefficient can be kept constant even at a high temperature.

When the friction coefficient is examined by changing the content of the refractory powder, the friction coefficient increases with the addition of the refractory powder. However, the increase rapidly increases until the content is close to about 10% by weight. And gradually increases as the content increases. Therefore, the content of the refractory material must be 10 wt% or more. However, when the content of the refractory material powder increases at the same time, the amount of wear of the counterpart material also increases.

Graphite is chemically more stable and less reactive than refractory materials. For this reason, the lining material and the mating material are extremely easily seized at the time of braking, but seizure is prevented and the mutual damage is prevented by the mixture of the graphite powder. Furthermore, even if there is a temperature change, it acts to prevent the coefficient of friction from changing and keep it constant.

[0021] The content of graphite powder, in which the effect of preventing seizure is remarkable, varies depending on the load applied to the lining material. At least 15 wt% is required for a brake lining material for a conveyor having a large load.

On the other hand, the lubricating property of graphite powder lowers the coefficient of friction. Therefore, it is necessary to prevent the graphite powder from being excessively contained and make its content 25 wt% or less.

As the graphite, artificial graphite and flaky graphite can be used, and the average particle size of the powder is 500 to 2000 in the former case.
μm, and in the latter case, 50 to 1000 μm is appropriate.

Cast iron is often used as a braking partner, but cast iron is harder than copper-based metal. The durability of the lining material is further enhanced by adding a metal powder having high hardness and high strength to the metal powder forming the matrix as compared with the copper-based metal powder alone. Such metal powders include iron powder and titanium powder. When the powder of these high-strength and high-hardness metals accounts for about 20% by weight of the metal powder, the amount of wear of the lining material is remarkably reduced even when used under a high load.

However, if the amount of iron powder or titanium powder is too large, the bonding strength of the matrix may be reduced. Therefore, the content should not exceed 40 wt% and the content of copper-based metal powder in the metal powder should be 60 wt%. % Or more is appropriate.

[0026] Among iron and titanium, titanium has a higher hardness, and at high temperatures, is well dissolved in a copper-based metal, so that the effect of strengthening the matrix is large. Therefore, it is important to include a small amount of titanium powder, but if it is too large, the hardness of the matrix becomes too large, and the refractory material powder and graphite powder may easily fall off. In addition, since it is an expensive metal, the amount of titanium powder is 0.1% by weight of iron powder. Suitably, it is set to 1 to 0.5.

The particle size of a metal powder such as a copper-based metal, iron powder, titanium powder or the like is preferably about 50 to 100 μm in average particle diameter from the viewpoint of sinterability.

FIG. 1 shows the ranges of the respective contents described above in terms of the contents with respect to the entire lining material. The range of the content rate is shown by the length of the vertical axis in the figure. (A) is 10 wt% to 20 wt% in the range of the refractory powder, and (b) is 15 wt% to 25 wt% in the range of the graphite powder. (C), (d),
(E) is 55 wt% to 75 wt% in the range of the metal powder.
Among them, (c) is about 9.1 wt% to 20 wt% in the total content in the range of iron powder, and (d) is about 0.9 wt% to 10 wt% in the range of titanium metal powder.

In this figure, since the contents of the refractory material powder and the graphite powder increase in the right direction of the horizontal axis, the composition in the right direction of the horizontal axis has better heat resistance. On the other hand, in the same direction, since the contents of the iron powder and the titanium powder are reduced, the wear resistance is reduced.

FIG. 2 shows the relationship between the content of the refractory material powder and graphite powder and the coefficient of friction. In the figure, A is a graph for the refractory material powder, and B is a graph for the graphite powder. The friction coefficients act so as to cancel each other.

As the refractory material, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), magnesia (MgO) or the like can be used, but when silica is used, the wear amount of the mating material is the smallest. The particle size of the refractory powder is 100 to 100
About 0 μm is desirable from the viewpoint of the coefficient of friction.

The above-described brake lining material mainly composed of a copper-based metal has high strength, has abrasion resistance and heat resistance, and maintains a constant friction coefficient stably even at a high temperature. When used as a brake lining material for a braking device, the service life is significantly improved.

[0033]

EXAMPLE An iron powder and a titanium powder were added to a copper-based metal powder, a refractory material powder and a graphite powder were further added, and a well-mixed compound was molded into a plate at a pressure of ² t / cm ² , and then vacuumed. 5kg / cm ²
Sintering was performed at 900 ° C. for 60 minutes while applying pressure to produce a lining material.

The lining material 1 was lined with a back plate 2 to form a brake plate, and a test was performed using the brake plate as a sample. The friction coefficient, the amount of wear of itself and the amount of wear of the mating material were examined, and the characteristics were evaluated.

As shown in FIG. 3, the test method is such that the lining material 1 is lined with the back plate 2 and the brake plate is pressed against the brake disk 3. The brake disc 3 is rotated via a disc fixing plate 5 attached to a rotating shaft 4. The brake plate was attached to the brake operation plate 6, the torque was detected via the operation plate shaft 7, and the friction coefficient was calculated.

FIG. 4 shows an overall view of the tester used. 1
1 is a sample mounting portion, 12 is a torque detecting portion, and 13 is an inertial force.
The adjustment unit adjusts the weight of the flywheel 14. Fifteen
Is a motor. Regarding rotation and braking under the following conditions
went. Counterpart material Gray cast iron FC200 (JISG
5501) Contact area 36.5 cm²  Braking surface initial speed 120km / H Inertial force 5.0kg ・ m ・ sec ²  Braking deceleration 0.5G Number of repetitions 50
The characteristics at 600 ° C. were investigated.
However, the measurement was performed and the coefficient of friction at 300 ° C was 6
Calculate the friction coefficient ratio at 00 ° C and determine the friction coefficient at high temperature.
Numerical stability was investigated.

The test was also performed on a phenol resin molding material and a metallic lining material using asbestos fibers which were conventionally used, and compared with the examples of the present invention.

Table 1 shows the composition conditions and test results of the lining material.

[0039]

[Table 1]

In Examples of the invention, the average coefficient of friction was close to 0.5. The ratio of the average friction coefficient is around 0.9 at 60.
The coefficient did not change much even when heated to 0 ° C., and was stable even at high temperatures.

In the embodiment of the present invention, the self-wear amount is 10
0 μm was not reached, and the wear amount of the mating material was 10 μm or less, which was a satisfactory result.

On the other hand, in the comparative example, in the test N0.4 in which the metal powder was only copper-based metal, the amount of self-wear was large, and in the test N0.5 in which the refractory material powder was not included, the average friction coefficient was too small. In test No. 0.6 containing no, seizure occurred even at 300 ° C., the average friction coefficient increased, and the amount of wear of the mating material increased. At 600 ° C., seizure was further increased and the average friction coefficient became extremely large.

Further, in the conventional example, the metallic lining material of test No. 0.7 does not contain the titanium powder and the refractory material powder and has a small amount of iron powder. The self-wear amount and the counterpart material wear amount were both large, and at 600 ° C., the average friction coefficient was further increased. In the organic lining material of Test N0.8, the average friction coefficient was too small, and the amount of self-wear was extremely large.

When the lining material of the third embodiment of the present invention was actually used as a brake lining of a braking device for a 40-ton conveyor, the braking force was stable and the service life was three months.

On the other hand, in the case of using the conventional metallic lining material, the braking force was unstable and the service life was 1.5 months. As is clear from these results, the brake lining material for a conveyor according to the present invention was excellent in the stability of the braking force in a high temperature range and the service life.

[0046]

As described above, the brake lining material according to the present invention is obtained by sintering appropriate types of metal powder, refractory material powder and graphite powder at appropriate ratios.
It has become possible to provide a braking material for conveyors that has a stable braking force and an excellent service life even under severe use conditions.

[Brief description of the drawings]

FIG. 1 is a diagram showing the composition of components of a brake lining for a conveyor according to the present invention.

FIG. 2 is a diagram showing the relationship between graphite, refractory content, and coefficient of friction.

FIG. 3 is a view showing a mounting structure of a test piece for testing characteristics of a brake lining.

FIG. 4 is a diagram showing an overall structure of a test device for testing characteristics of a brake lining.

Continuation of front page (56) References JP-A-61-266542 (JP, A) JP-A-7-149921 (JP, A) JP-A-7-53947 (JP, A) JP-A-58-79073 (JP, A) JP-A-63-30617 (JP, A) JP-A-53-76266 (JP, A) JP-B-59-4461 (JP, B2) JP-B-6-45837 (JP, B2) (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 69/00-69/02 C09K 3/14 C22C 32/00 C22C 9/00

Claims (3)

(57) [Claims] 1. A metal powder comprising copper, copper alloy, iron and titanium powders, wherein the total of iron powder and titanium powder is 20% by weight or more and 40% by weight or less, and the balance is copper or copper alloy. Alternatively, a metal powder which is a powder obtained by mixing them is sintered in a state in which 10 wt% to 20 wt% of the whole refractory material powder and 15 wt% to 25 wt% of graphite powder are uniformly mixed. Brake lining material for conveyors, characterized in that: 2. The brake lining material for a conveyor according to claim 1, wherein the weight ratio of the titanium powder is 0.1 to 0.5 of the iron powder. 3. The brake lining material for a conveyor according to claim 1, wherein the refractory material powder is silica.