Brake pad with wear-resisting and noise-reducing effects for high-speed rail and casting method of brake pad

Abstract

The invention discloses a high-speed rail brake pad with wear-resisting and noise-reducing effects and a casting method of the high-speed rail brake pad, and relates to the technical field of casting of brake pads for high-speed rails. The friction block is composed of 80 parts of copper, 10 parts of carbon fibers, 3 parts of tin, 20 parts of aluminum oxide, 70 parts of iron, 5 parts of chromium, 2 parts of silicon carbide, 3 parts of graphite, 3 parts of molybdenum disulfide, 5 parts of ammonium tungstate, 2 parts of ammonium molybdate, 5 parts of boron powder, 12 parts of ceramic particles and 20 parts of tungsten carbide, the raw materials of the friction block are mixed for 1.5-2 h through a stirring kettle, and the sintering time of the friction block a is 2-3 h; the sintering atmosphere of the friction block a is one or a combination of more of air, vacuum, argon, nitrogen, hydrogen or carbon monoxide, and the function that the abrasion resistance of the brake pad for the high-speed rail is obviously improved is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed rail brake pad casting, and in particular to a high-speed rail brake pad with wear-resistant and noise-reducing effects and a casting method thereof. Background Art

[0002] The continuous advancement of high-speed rail construction and the increase in operating speed have put higher and higher technical requirements on brake pads. As a key component of the braking system, the performance of high-speed rail brake pads directly affects the running safety and braking efficiency of the train. The background technology of high-speed rail brake pads covers many aspects such as material technology, manufacturing process technology and testing technology. The performance of high-speed rail brake pads will be further improved, providing more reliable protection for the safe operation of high-speed rail. The existing high-speed rail brake pads have poor wear resistance and need to be replaced frequently, which increases manual labor and affects use.

[0003] The defects of existing high-speed rail brake pads are:

[0004] 1. Patent document CN110864058A discloses a disc brake pad and a disc brake pad manufacturing process, "including a mounting plate, both sides of which are provided with clamping grooves, the surface of the mounting plate is provided with a high-strength layer, and the front of the mounting plate is fixedly connected with a friction brake pad. The present invention achieves the advantages of increasing the strength and wear resistance of the disc brake pad by arranging a high-strength layer, a steel coating layer, an aluminum alloy coating layer, an iron coating layer, a wear-resistant layer, a graphite wear-resistant material layer, a tungsten carbide wear-resistant material layer and a silicone wear-resistant material layer to cooperate with each other, so that the disc brake pad can effectively increase the strength of the disc brake pad during long-term use, prevent the disc brake pad from breaking, prevent the disc brake pad from being damaged, and extend the service life of the disc brake pad. At the same time, it can increase the wear resistance of the disc brake pad, improve the wear resistance of the disc brake pad, prevent the disc brake pad from being damaged, and extend the service life of the disc brake pad", but the existing high-speed rail brake pads have poor wear resistance and require frequent replacement of brake pads, which increases manual labor and affects use;

[0005] 2. Patent document CN102977600A discloses a disc brake pad friction material, "The weight percentage of its raw materials and each component is: phenolic resin 10-20%, nitrile rubber 3-5%, Kevlar fiber 10-20%, carbon fiber 3-5%, needle-shaped wollastonite 8-18%, steel wool 7-15%, foamed iron powder 3-8%, graphite 7-15%, iron red 2-5%, molybdenum disulfide 2-3%, barite 2-4%, vermiculite 3-5%, cashew nut shell oil friction powder 5-15%, tire powder 15-25%, Aluminum oxide 1-4%. It can be seen that the metal content in this raw material composition is low, and it does not contain asbestos and any copper elements. The friction material made with this raw material ratio meets the standards of environmentally friendly friction materials and can break through the legislative trade restrictions imposed by some European and American countries on limiting the content of harmful heavy metal components and copper in friction materials. It can be seen that the disc brake pad friction material provided by the embodiment of the present invention has a breakthrough significance. However, the existing high-speed rail brake pads are noisy when used, which can easily cause hearing damage to waiting passengers when the high-speed rail stops at the station. Summary of the invention

[0006] The purpose of the present invention is to provide a high-speed railway brake pad with wear-resistant and noise-reducing effects and a casting method thereof, so as to solve the technical problems of the existing high-speed railway brake pads mentioned in the above background technology, such as poor wear resistance and poor noise reduction during use that affect their use.

[0007] To achieve the above object, the present invention provides the following technical solution: a casting method for a high-speed railway brake pad with wear-resistant and noise-reducing effects, comprising the following steps:

[0008] Step s1, mixing the raw materials of the friction block in a stirring kettle, and the mixed raw materials of the friction block form a mixture a;

[0009] Step s2, the mixed material a is put into a mold, and a friction block a is formed by a cold pressing or hot pressing process. During the forming process of the friction block a, the pressure, temperature and time parameters of the cold pressing process or the hot pressing process are controlled to ensure the density of the friction block a;

[0010] Step s3, the friction block a is placed in a sintering furnace for sintering. During the sintering process, the friction block a is sintered at 800-1120° C. to form a friction block b. The friction block b is ground, polished and cleaned to form a friction block c.

[0011] Step s4, the brake pad is hot-pressed by arranging the back plate, the heat-insulating and sound-absorbing layer, and the friction block c;

[0012] The raw materials of the friction block include the following materials in parts by weight: 80-100 parts of copper, 10-18 parts of carbon fiber, 3-10 parts of tin, 20-35 parts of aluminum oxide, 70-90 parts of iron, 5-10 parts of chromium, 2-6 parts of silicon carbide, 3-12 parts of graphite, 3-15 parts of molybdenum disulfide, 5-13 parts of ammonium tungstate, 2-8 parts of ammonium molybdate, 5-16 parts of boron powder, 12-18 parts of ceramic particles and 20-25 parts of tungsten carbide. The raw materials of the friction block are mixed in a stirred tank for 1.5-2 hours.

[0013] Preferably, the sintering time of the friction block a is 2 to 3 hours, and the sintering atmosphere of the friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide.

[0014] Preferably, the heat insulation and sound-absorbing layer comprises the following materials in parts by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red.

[0015] Preferably, the friction block c is subjected to one of polishing, chrome plating and nickel plating to improve the smoothness, hardness and corrosion resistance of the surface of the friction block c.

[0016] Preferably, the grinding sheet used for polishing the friction block c has a mesh size of 40 to 100, the chrome plating time of the friction block c is 1 to 2 hours, and the nickel plating time of the friction block c is 1 to 2 hours.

[0017] Preferably, the cold press forming process uses a press machine with a forming pressure of 600-700 MPa.

[0018] Preferably, the temperature of the cold press forming process is 20-40° C., and the time of the cold press forming process is 1-3 minutes.

[0019] Preferably, the hot pressing process uses one of a piston stamping machine and a press machine, and the hot pressing pressure is 300-600 MPa.

[0020] Preferably, the hot pressing temperature of the hot pressing forming process is 360-400° C., and the hot pressing time of the hot pressing forming process is 10-30 minutes.

[0021] Preferably, the brake pad comprises a back plate, a heat-insulating and sound-absorbing layer, and a friction block c. The inner wall of the back plate is hot-pressed with a heat-insulating and sound-absorbing layer, the outer wall of the heat-insulating and sound-absorbing layer is installed with a friction block c, and the outer wall of the friction block c is provided with a fishing net-like pattern.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention is equipped with friction block raw materials including the following materials by weight: 80 parts of copper, 10 parts of carbon fiber, 3 parts of tin, 20 parts of aluminum oxide, 70 parts of iron, 5 parts of chromium, 2 parts of silicon carbide, 3 parts of graphite, 3 parts of molybdenum disulfide, 5 parts of ammonium tungstate, 2 parts of ammonium molybdate, 5 parts of boron powder, 12 parts of ceramic particles, and 20 parts of tungsten carbide. The friction block raw materials are mixed in a stirred tank for 1.5 to 2 hours, the sintering time of friction block a is 2 to 3 hours, and the sintering atmosphere of friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide, thereby significantly improving the wear resistance of high-speed rail brake pads, and there is no need to frequently replace the brake pads;

[0024] 2. The present invention is provided with a heat-insulating and sound-absorbing layer comprising the following materials in parts by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red. The friction block C is polished, chrome-plated, or nickel-plated to improve the smoothness, hardness, and corrosion resistance of the surface of the friction block C. The grinding sheet used for polishing the friction block C has a mesh number of 40-100, the chrome-plating time of the friction block C is 1-2 hours, and the nickel-plating time of the friction block C is 1-2 hours. This achieves the goal of reducing the noise when using the high-speed rail brake pad and reducing the hearing damage to waiting personnel when the high-speed rail stops at the station. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of experimental data of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, it can be understood according to the specific situation.

[0029] Embodiment 1: An embodiment provided by the present invention: A method for casting a high-speed railway brake pad with wear-resistant and noise-reducing effects, comprising the following steps:

[0030] Step s1, mixing the raw materials of the friction block in a stirring kettle, and the mixed raw materials of the friction block form a mixture a;

[0031] Step s2, the mixed material a is put into a mold, and a friction block a is formed by a cold pressing or hot pressing process. During the forming process of the friction block a, the pressure, temperature and time parameters of the cold pressing process or the hot pressing process are controlled to ensure the density of the friction block a;

[0032] Step s3, the friction block a is placed in a sintering furnace for sintering. During the sintering process, the friction block a is sintered at 800-1120° C. to form a friction block b. The friction block b is ground, polished and cleaned to form a friction block c.

[0033] Step s4, the brake pad is hot-pressed by arranging the back plate, the heat-insulating and sound-absorbing layer, and the friction block c;

[0034] The raw materials of the friction block include the following materials in parts by weight: 80 parts of copper, 10 parts of carbon fiber, 3 parts of tin, 20 parts of aluminum oxide, 70 parts of iron, 5 parts of chromium, 2 parts of silicon carbide, 3 parts of graphite, 3 parts of molybdenum disulfide, 5 parts of ammonium tungstate, 2 parts of ammonium molybdate, 5 parts of boron powder, 12 parts of ceramic particles, and 20 parts of tungsten carbide. The raw materials of the friction block are mixed in a stirring kettle for 1.5 to 2 hours. The sintering time of the friction block a is 2 to 3 hours. The sintering atmosphere of the friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. The heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50 to 80 parts of steel fiber, 20 to 25 parts of glass fiber, 10 to 15 parts of phenolic resin, 5 to 10 parts of basalt fiber, 2 to 8 parts of silicon carbide, 3 to 6 parts of barium sulfate, 2 to 6 parts of nitrile rubber powder, and 2 to 5 parts of iron red. The friction block c is polished, chrome-plated, or nickel-plated. The invention discloses a kind of brake pad, in order to improve the smoothness, hardness and corrosion resistance of the surface of the friction block c. The mesh number of the grinding sheet used for polishing the friction block c is 40 to 100 meshes. The chrome plating time of the friction block c is 1 to 2 hours. The nickel plating time of the friction block c is 1 to 2 hours. The cold pressing process uses a press machine. The molding pressure is 600 to 700 MPa. The temperature of the cold pressing process is 20 to 40°C. The time of the cold pressing process is 1 to 3 minutes. The hot pressing process uses a piston stamping molding machine and a press machine. The hot pressing molding pressure is 300 to 600 MPa. The hot pressing temperature of the hot pressing process is 360 to 400°C. The hot pressing time of the hot pressing process is 10 to 30 minutes. The brake pad comprises a back plate, a heat insulation and sound absorbing layer, and a friction block c. The inner wall of the back plate is hot-pressed with a heat insulation and sound absorbing layer. The outer wall of the heat insulation and sound absorbing layer is installed with the friction block c. The outer wall of the friction block c is provided with a fishing net-like pattern.

[0035] Embodiment 2: An embodiment provided by the present invention: A method for casting a high-speed railway brake pad with wear-resistant and noise-reducing effects, comprising the following steps:

[0036] Step s1, mixing the raw materials of the friction block in a stirring kettle, and the mixed raw materials of the friction block form a mixture a;

[0037] Step s2, the mixed material a is put into a mold, and a friction block a is formed by a cold pressing or hot pressing process. During the forming process of the friction block a, the pressure, temperature and time parameters of the cold pressing process or the hot pressing process are controlled to ensure the density of the friction block a;

[0038] Step s3, the friction block a is placed in a sintering furnace for sintering. During the sintering process, the friction block a is sintered at 800-1120° C. to form a friction block b. The friction block b is ground, polished and cleaned to form a friction block c.

[0039] Step s4, the brake pad is hot-pressed by arranging the back plate, the heat-insulating and sound-absorbing layer, and the friction block c;

[0040] The raw materials of the friction block include the following materials in parts by weight: 85 parts of copper, 12 parts of carbon fiber, 5 parts of tin, 25 parts of aluminum oxide, 25 parts of iron, 7 parts of chromium, 4 parts of silicon carbide, 5 parts of graphite, 5 parts of molybdenum disulfide, 8 parts of ammonium tungstate, 4 parts of ammonium molybdate, 8 parts of boron powder, 15 parts of ceramic particles, and 21 parts of tungsten carbide. The raw materials of the friction block are mixed in a stirring kettle for 1.5 to 2 hours. The sintering time of the friction block a is 2 to 3 hours. The sintering atmosphere of the friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. The heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50 to 80 parts of steel fiber, 20 to 25 parts of glass fiber, 10 to 15 parts of phenolic resin, 5 to 10 parts of basalt fiber, 2 to 8 parts of silicon carbide, 3 to 6 parts of barium sulfate, 2 to 6 parts of nitrile rubber powder, and 2 to 5 parts of iron red. The friction block c is polished, chrome-plated, or nickel-plated. The invention discloses a kind of brake pad, in order to improve the smoothness, hardness and corrosion resistance of the surface of the friction block c. The mesh number of the grinding sheet used for polishing the friction block c is 40 to 100 meshes. The chrome plating time of the friction block c is 1 to 2 hours. The nickel plating time of the friction block c is 1 to 2 hours. The cold pressing process uses a press machine. The molding pressure is 600 to 700 MPa. The temperature of the cold pressing process is 20 to 40°C. The time of the cold pressing process is 1 to 3 minutes. The hot pressing process uses a piston stamping molding machine and a press machine. The hot pressing molding pressure is 300 to 600 MPa. The hot pressing temperature of the hot pressing process is 360 to 400°C. The hot pressing time of the hot pressing process is 10 to 30 minutes. The brake pad comprises a back plate, a heat insulation and sound absorbing layer, and a friction block c. The inner wall of the back plate is hot-pressed with a heat insulation and sound absorbing layer. The outer wall of the heat insulation and sound absorbing layer is installed with the friction block c. The outer wall of the friction block c is provided with a fishing net-like pattern.

[0041] Embodiment 3: An embodiment provided by the present invention: A method for casting a high-speed railway brake pad with wear-resistant and noise-reducing effects, comprising the following steps:

[0042] Step s1, mixing the raw materials of the friction block in a stirring kettle, and the mixed raw materials of the friction block form a mixture a;

[0043] Step s2, the mixed material a is put into a mold, and a friction block a is formed by a cold pressing or hot pressing process. During the forming process of the friction block a, the pressure, temperature and time parameters of the cold pressing process or the hot pressing process are controlled to ensure the density of the friction block a;

[0044] Step s3, the friction block a is placed in a sintering furnace for sintering. During the sintering process, the friction block a is sintered at 800-1120° C. to form a friction block b. The friction block b is ground, polished and cleaned to form a friction block c.

[0045] Step s4, the brake pad is hot-pressed by arranging the back plate, the heat-insulating and sound-absorbing layer, and the friction block c;

[0046] The raw materials of the friction block include the following materials in parts by weight: 90 parts of copper, 16 parts of carbon fiber, 6 parts of tin, 30 parts of aluminum oxide, 85 parts of iron, 8 parts of chromium, 6 parts of silicon carbide, 7 parts of graphite, 12 parts of molybdenum disulfide, 9 parts of ammonium tungstate, 6 parts of ammonium molybdate, 8 parts of boron powder, 14 parts of ceramic particles, and 23 parts of tungsten carbide. The raw materials of the friction block are mixed in a stirring kettle for 1.5 to 2 hours. The sintering time of the friction block a is 2 to 3 hours. The sintering atmosphere of the friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. The heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50 to 80 parts of steel fiber, 20 to 25 parts of glass fiber, 10 to 15 parts of phenolic resin, 5 to 10 parts of basalt fiber, 2 to 8 parts of silicon carbide, 3 to 6 parts of barium sulfate, 2 to 6 parts of nitrile rubber powder, and 2 to 5 parts of iron red. The friction block c is polished, chrome-plated, nickel-plated, etc. A method for improving the smoothness, hardness and corrosion resistance of the surface of a friction block C, wherein the number of grinding sheets used for polishing the friction block C is 40 to 100, the chrome plating time of the friction block C is 1 to 2 hours, the nickel plating time of the friction block C is 1 to 2 hours, a press is used in the cold pressing process, the molding pressure is 600 to 700 MPa, the temperature of the cold pressing process is 20 to 40°C, and the time of the cold pressing process is 1 to 3 minutes, and a piston stamping molding machine and a press are used in the hot pressing process. The hot pressing molding pressure is 300 to 600 MPa, the hot pressing temperature of the hot pressing molding process is 360 to 400°C, and the hot pressing time of the hot pressing molding process is 10 to 30 minutes. The brake pad comprises a back plate, a heat insulation and sound absorbing layer, and a friction block C. The inner wall of the back plate is hot-pressed with a heat insulation and sound absorbing layer, the outer wall of the heat insulation and sound absorbing layer is installed with the friction block C, and the outer wall of the friction block C is provided with a fishing net-like pattern.

[0047] Embodiment 4: An embodiment provided by the present invention: A casting method for a high-speed railway brake pad with wear-resistant and noise-reducing effects, comprising the following steps:

[0048] Step s1, mixing the raw materials of the friction block in a stirring kettle, and the mixed raw materials of the friction block form a mixture a;

[0049] Step s2, the mixed material a is put into a mold, and a friction block a is formed by a cold pressing or hot pressing process. During the forming process of the friction block a, the pressure, temperature and time parameters of the cold pressing process or the hot pressing process are controlled to ensure the density of the friction block a;

[0050] Step s3, the friction block a is placed in a sintering furnace for sintering. During the sintering process, the friction block a is sintered at 800-1120° C. to form a friction block b. The friction block b is ground, polished and cleaned to form a friction block c.

[0051] Step s4, the brake pad is hot-pressed by arranging the back plate, the heat-insulating and sound-absorbing layer, and the friction block c;

[0052] The raw materials of the friction block include the following materials in parts by weight: 95 parts of copper, 46 parts of carbon fiber, 6 parts of tin, 32 parts of aluminum oxide, 85 parts of iron, 7 parts of chromium, 3 parts of silicon carbide, 6 parts of graphite, 13 parts of molybdenum disulfide, 10 parts of ammonium tungstate, 6 parts of ammonium molybdate, 14 parts of boron powder, 14 parts of ceramic particles, and 23 parts of tungsten carbide. The raw materials of the friction block are mixed in a stirring kettle for 1.5 to 2 hours. The sintering time of the friction block a is 2 to 3 hours. The sintering atmosphere of the friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. The heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50 to 80 parts of steel fiber, 20 to 25 parts of glass fiber, 10 to 15 parts of phenolic resin, 5 to 10 parts of basalt fiber, 2 to 8 parts of silicon carbide, 3 to 6 parts of barium sulfate, 2 to 6 parts of nitrile rubber powder, and 2 to 5 parts of iron red. The friction block c is polished, chrome-plated, and nickel-plated. A method of improving the smoothness, hardness and corrosion resistance of the friction block c surface, wherein the number of grinding sheets used for polishing the friction block c is 40 to 100 meshes, the chrome plating time of the friction block c is 1 to 2 hours, the nickel plating time of the friction block c is 1 to 2 hours, the cold pressing process uses a press machine, the molding pressure is 600 to 700 MPa, the temperature of the cold pressing process is 20 to 40°C, and the time of the cold pressing process is 1 to 3 minutes. The hot pressing process uses a piston stamping molding machine or a press machine, the hot pressing molding pressure is 300 to 600 MPa, the hot pressing temperature of the hot pressing molding process is 360 to 400°C, and the hot pressing time of the hot pressing molding process is 10 to 30 minutes. The brake pad comprises a back plate, a heat insulation and sound absorbing layer, and a friction block c. The inner wall of the back plate is hot-pressed with a heat insulation and sound absorbing layer, the outer wall of the heat insulation and sound absorbing layer is installed with the friction block c, and the outer wall of the friction block c is provided with a fishing net-like pattern.

[0053] Embodiment 5: An embodiment provided by the present invention: A casting method for a high-speed railway brake pad with wear-resistant and noise-reducing effects, comprising the following steps:

[0054] Step s1, mixing the raw materials of the friction block in a stirring kettle, and the mixed raw materials of the friction block form a mixture a;

[0055] Step s2, the mixed material a is put into a mold, and a friction block a is formed by a cold pressing or hot pressing process. During the forming process of the friction block a, the pressure, temperature and time parameters of the cold pressing process or the hot pressing process are controlled to ensure the density of the friction block a;

[0056] Step s3, the friction block a is placed in a sintering furnace for sintering. During the sintering process, the friction block a is sintered at 800-1120° C. to form a friction block b. The friction block b is ground, polished and cleaned to form a friction block c.

[0057] Step s4, the brake pad is hot-pressed by arranging the back plate, the heat-insulating and sound-absorbing layer, and the friction block c;

[0058] The raw materials of the friction block include the following materials in parts by weight: 98 parts of copper, 18 parts of carbon fiber, 9 parts of tin, 34 parts of aluminum oxide, 89 parts of iron, 9 parts of chromium, 6 parts of silicon carbide, 12 parts of graphite, 14 parts of molybdenum disulfide, 13 parts of ammonium tungstate, 8 parts of ammonium molybdate, 15 parts of boron powder, 18 parts of ceramic particles, and 25 parts of tungsten carbide. The raw materials of the friction block are mixed in a stirring kettle for 1.5 to 2 hours. The sintering time of the friction block a is 2 to 3 hours. The sintering atmosphere of the friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. The heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50 to 80 parts of steel fiber, 20 to 25 parts of glass fiber, 10 to 15 parts of phenolic resin, 5 to 10 parts of basalt fiber, 2 to 8 parts of silicon carbide, 3 to 6 parts of barium sulfate, 2 to 6 parts of nitrile rubber powder, and 2 to 5 parts of iron red. The friction block c is polished, chrome-plated, and nickel-plated. A method of improving the smoothness, hardness and corrosion resistance of the friction block c surface, wherein the number of grinding sheets used for polishing the friction block c is 40 to 100 meshes, the chrome plating time of the friction block c is 1 to 2 hours, the nickel plating time of the friction block c is 1 to 2 hours, the cold pressing process uses a press machine, the molding pressure is 600 to 700 MPa, the temperature of the cold pressing process is 20 to 40°C, and the time of the cold pressing process is 1 to 3 minutes. The hot pressing process uses a piston stamping molding machine or a press machine, the hot pressing molding pressure is 300 to 600 MPa, the hot pressing temperature of the hot pressing molding process is 360 to 400°C, and the hot pressing time of the hot pressing molding process is 10 to 30 minutes. The brake pad comprises a back plate, a heat insulation and sound absorbing layer, and a friction block c. The inner wall of the back plate is hot-pressed with a heat insulation and sound absorbing layer, the outer wall of the heat insulation and sound absorbing layer is installed with the friction block c, and the outer wall of the friction block c is provided with a fishing net-like pattern.

[0059] Comparative experiment:

[0060] The difference between Comparative Example 1 and Example 1 is that the friction block raw materials include the following materials in parts by weight: 80 parts of copper, 10 parts of carbon fiber, 3 parts of tin, 20 parts of aluminum oxide, 70 parts of iron, 5 parts of chromium, 2 parts of silicon carbide, 3 parts of graphite, 3 parts of molybdenum disulfide, 5 parts of ammonium tungstate, 2 parts of ammonium molybdate, 5 parts of boron powder, 12 parts of ceramic particles, and 20 parts of tungsten carbide. The friction block raw materials are mixed in a stirred tank for 1.5 to 2 hours, the sintering time of friction block a is 2 to 3 hours, and the sintering atmosphere of friction block a is one or more of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. A combination, the heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red. The friction block C is polished, chrome-plated, or nickel-plated to improve the smoothness, hardness, and corrosion resistance of the surface of the friction block C. The grinding sheet used for polishing the friction block C has a mesh number of 40-100. The chrome plating time of the friction block C is 1-2 hours, and the nickel plating time of the friction block C is 1-2 hours.

[0061] The difference between Comparative Example 1 and Example 2 is that the friction block raw materials include the following materials in parts by weight: 85 parts of copper, 12 parts of carbon fiber, 5 parts of tin, 25 parts of aluminum oxide, 25 parts of iron, 7 parts of chromium, 4 parts of silicon carbide, 5 parts of graphite, 5 parts of molybdenum disulfide, 8 parts of ammonium tungstate, 4 parts of ammonium molybdate, 8 parts of boron powder, 15 parts of ceramic particles, and 21 parts of tungsten carbide. The friction block raw materials are mixed in a stirred tank for 1.5 to 2 hours, the sintering time of friction block a is 2 to 3 hours, and the sintering atmosphere of friction block a is one or more of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. A combination, the heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red. The friction block C is polished, chrome-plated, or nickel-plated to improve the smoothness, hardness, and corrosion resistance of the surface of the friction block C. The grinding sheet used for polishing the friction block C has a mesh number of 40-100. The chrome plating time of the friction block C is 1-2 hours, and the nickel plating time of the friction block C is 1-2 hours.

[0062] The difference between Comparative Example 1 and Example 3 is that the friction block raw materials include the following materials in parts by weight: 90 parts of copper, 16 parts of carbon fiber, 6 parts of tin, 30 parts of aluminum oxide, 85 parts of iron, 8 parts of chromium, 6 parts of silicon carbide, 7 parts of graphite, 12 parts of molybdenum disulfide, 9 parts of ammonium tungstate, 6 parts of ammonium molybdate, 8 parts of boron powder, 14 parts of ceramic particles, and 23 parts of tungsten carbide. The friction block raw materials are mixed in a stirred tank for 1.5 to 2 hours, the sintering time of friction block a is 2 to 3 hours, and the sintering atmosphere of friction block a is one or more of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. A combination, the heat insulation and sound-absorbing layer includes the following materials in parts by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red. The friction block C is polished, chrome-plated, or nickel-plated to improve the smoothness, hardness, and corrosion resistance of the surface of the friction block C. The grinding sheet used for polishing the friction block C has a mesh number of 40-100. The chrome plating time of the friction block C is 1-2 hours, and the nickel plating time of the friction block C is 1-2 hours.

[0063] The difference between Comparative Example 1 and Example 4 is that the friction block raw materials include the following materials in parts by weight: 95 parts of copper, 46 parts of carbon fiber, 6 parts of tin, 32 parts of aluminum oxide, 85 parts of iron, 7 parts of chromium, 3 parts of silicon carbide, 6 parts of graphite, 13 parts of molybdenum disulfide, 10 parts of ammonium tungstate, 6 parts of ammonium molybdate, 14 parts of boron powder, 14 parts of ceramic particles, and 23 parts of tungsten carbide. The friction block raw materials are mixed in a stirred tank for 1.5 to 2 hours, the sintering time of friction block a is 2 to 3 hours, and the sintering atmosphere of friction block a is one or more of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. Various combinations, the heat insulation and sound-absorbing layer includes the following materials by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red. The friction block C is polished, chrome-plated, or nickel-plated to improve the smoothness, hardness, and corrosion resistance of the surface of the friction block C. The grinding sheet used for polishing the friction block C has a mesh number of 40-100. The chrome plating time of the friction block C is 1-2 hours, and the nickel plating time of the friction block C is 1-2 hours.

[0064] The difference between Comparative Example 1 and Example 5 is that the friction block raw materials include the following materials in parts by weight: 98 parts of copper, 18 parts of carbon fiber, 9 parts of tin, 34 parts of aluminum oxide, 89 parts of iron, 9 parts of chromium, 6 parts of silicon carbide, 12 parts of graphite, 14 parts of molybdenum disulfide, 13 parts of ammonium tungstate, 8 parts of ammonium molybdate, 15 parts of boron powder, 18 parts of ceramic particles, and 25 parts of tungsten carbide. The friction block raw materials are mixed in a stirred tank for 1.5 to 2 hours, the sintering time of friction block a is 2 to 3 hours, and the sintering atmosphere of friction block a is one of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide. or multiple combinations, the heat insulation and sound-absorbing layer comprises the following materials in parts by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red; the friction block c is polished, chrome-plated, or nickel-plated to improve the smoothness, hardness, and corrosion resistance of the surface of the friction block c; the grinding sheet used for polishing the friction block c has a mesh number of 40-100; the chrome-plating time of the friction block c is 1-2 hours; and the nickel-plating time of the friction block c is 1-2 hours;

[0065] The high-speed railway brake pads with wear-resistant and noise-reducing effects of Examples 1, 2, 3, 4 and 5 of the present invention and the conventional high-speed railway brake pads (Comparative Example 1) were subjected to wear resistance tests and noise data experiments during use, and their values ​​were calculated and statistically analyzed, and the results are shown in Table 1.

[0066] <![CDATA[Wear resistance (G / cm 2 )]]> Noise(DB) Example 1 80 260 Example 2 85 255 Example 3 86 253 Example 4 82 258 Example 5 83 261 Comparative Example 1 70 320

[0067] Table 1

[0068] From the data in Table 1, it can be seen that the wear resistance of the high-speed railway brake pads with wear-resistant and noise-reducing effects using Examples 1, 2, 3, 4 and 5 of the present invention are 80, 85, 86, 82 and 83 respectively, which are significantly higher than the wear resistance of the traditional high-speed railway brake pads in Comparative Example 1. This indicates that the wear resistance of the high-speed railway brake pads of the present invention is significantly improved.

[0069] From the data in Table 1, it can be seen that the noise levels of the high-speed rail brake pads with wear-resistant and noise-reducing effects in Examples 1, 2, 3, 4 and 5 of the present invention are 260, 255, 253, 258 and 261 respectively, which are significantly lower than the noise level of the traditional high-speed rail brake pads in Comparative Example 1. This indicates that the noise reduction effect of the high-speed rail brake pads of the present invention is significantly improved.

[0070] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for casting a high-speed railway brake pad with wear-resistant and noise-reducing effects, characterized in that: The following steps are involved: Step s1, mixing the raw materials of the friction block in a stirring kettle, and the mixed raw materials of the friction block form a mixture a; Step s2, the mixed material a is put into a mold, and a friction block a is formed by a cold pressing or hot pressing process. During the forming process of the friction block a, the pressure, temperature and time parameters of the cold pressing process or the hot pressing process are controlled to ensure the density of the friction block a; Step s3, the friction block a is placed in a sintering furnace for sintering. During the sintering process, the friction block a is sintered at 800-1120° C. to form a friction block b. The friction block b is ground, polished and cleaned to form a friction block c. Step s4, the brake pad is hot-pressed by arranging the back plate, the heat-insulating and sound-absorbing layer, and the friction block c; The raw materials of the friction block include the following materials in parts by weight: 80-100 parts of copper, 10-18 parts of carbon fiber, 3-10 parts of tin, 20-35 parts of aluminum oxide, 70-90 parts of iron, 5-10 parts of chromium, 2-6 parts of silicon carbide, 3-12 parts of graphite, 3-15 parts of molybdenum disulfide, 5-13 parts of ammonium tungstate, 2-8 parts of ammonium molybdate, 5-16 parts of boron powder, 12-18 parts of ceramic particles and 20-25 parts of tungsten carbide. The raw materials of the friction block are mixed in a stirred tank for 1.5-2 hours.

2. The casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 1, characterized in that: The sintering time of the friction block a is 2 to 3 hours, and the sintering atmosphere of the friction block a is one or more combinations of air, vacuum, argon, nitrogen, hydrogen, or carbon monoxide.

3. The casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 1, characterized in that: The heat-insulating and sound-absorbing layer comprises the following materials in parts by weight: 50-80 parts of steel fiber, 20-25 parts of glass fiber, 10-15 parts of phenolic resin, 5-10 parts of basalt fiber, 2-8 parts of silicon carbide, 3-6 parts of barium sulfate, 2-6 parts of nitrile rubber powder, and 2-5 parts of iron red.

4. The casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 1, characterized in that: The friction block c is polished, chrome plated or nickel plated to improve the smoothness, hardness and corrosion resistance of the surface of the friction block c.

5. The casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 4, characterized in that: The grinding sheet used for polishing the friction block C has a mesh number of 40 to 100, the chrome plating time of the friction block C is 1 to 2 hours, and the nickel plating time of the friction block C is 1 to 2 hours.

6. The casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 1, characterized in that: The cold press forming process uses a press machine with a forming pressure of 600-700 MPa.

7. A method for casting a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 6, characterized in that: The temperature of the cold press forming process is 20-40° C., and the time of the cold press forming process is 1-3 minutes.

8. The casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 1, characterized in that: The hot pressing process uses a piston stamping machine or a press machine, and the hot pressing pressure is 300-600 MPa.

9. The casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects according to claim 8, characterized in that: The hot pressing temperature of the hot pressing forming process is 360-400° C., and the hot pressing time of the hot pressing forming process is 10-30 minutes.

10. A high-speed railway brake pad with wear-resistant and noise-reducing effects, applicable to the casting method of a high-speed railway brake pad with wear-resistant and noise-reducing effects as claimed in any one of claims 1 to 9, characterized in that: The brake pad comprises a back plate, a heat-insulating and sound-absorbing layer, and a friction block C. The inner wall of the back plate is hot-pressed with a heat-insulating and sound-absorbing layer, the outer wall of the heat-insulating and sound-absorbing layer is installed with a friction block C, and the outer wall of the friction block C is provided with a fishing net-like pattern.

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