High-strength brake lining and processing technology and strength detection method thereof

Abstract

The invention provides a high-strength brake lining, which comprises a lining body, and the lining body comprises the following components in percentage by mass: 1-10% of a reinforcing agent, 1-10% of a lubricant and 1-10% of a lubricant. Comprising 15-25% of PF6816 phenolic resin, 10-20% of glass fiber, 1-5% of aramid pulp, 2-5% of antimony sulfide, 5-10% of mineral fiber, 5-10% of talcum powder, 5-10% of barite powder, 1-5% of zircon powder, 1-5% of nitrile rubber powder, 2-5% of tire powder, 2-5% of friction powder, 5-10% of carbon fiber, 10-15% of graphite, 2-5% of grinding machine ash, 2-5% of petroleum coke and 2-5% of ultra-high molecular weight polyethylene. And 5-10% of metal brazing ceramic powder. The brake lining has the advantages that a friction system is stable, large fluctuation is avoided, and it is guaranteed that the brake lining can provide brake stability under various working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of brake lining production, and in particular to a high-strength brake lining and a processing technology and a strength detection method thereof. Background Art

[0002] Brake pads are key components in the braking system. They rub against the brake disc (or brake drum) to form a friction pair, generate braking torque, and convert the kinetic energy of the car into heat energy. The comprehensive performance of brake pads is directly related to the reliability and stability of the braking system.

[0003] In the prior art, for example, the invention patent with publication number CN115259851B, entitled A carbon fiber ceramic brake pad and its preparation method, discloses the following contents, including: aramid organic fiber 5-8%, ceramic fiber 5-10%, metal fiber 8-10%, phenolic resin 5-12%, carbon fiber 10-25%, modified potassium titanate fiber 5-20%, mica powder 5-20%, barium sulfate 5-15%, vermiculite 4-10%, and friction modifier 2-10%.

[0004] In actual use, it was found that under continuous braking, the friction coefficient of this type of brake pad is unstable, and under different temperature conditions, the friction coefficient fluctuates greatly, resulting in relatively poor actual braking effect of the brake pad and relatively high degree of wear of the brake pad. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a high-strength brake lining and its processing technology and strength testing method, which are used to solve the technical problem in the background technology that the friction coefficient of the existing brake lining fluctuates greatly under different temperature conditions, resulting in relatively poor actual braking effect of the brake pad.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A high-strength brake lining, characterized in that it includes a lining body, wherein the components of the lining body, by mass fraction, include 15-25% phenolic resin, 10-20% glass fiber, 1-5% aramid pulp, 2-5% antimony sulfide, 5-10% mineral fiber, 5-10% talcum powder, 5-10% barite powder, 1-5% zircon powder, 1-5% nitrile rubber powder, 2-5% tire powder, 2-5% friction powder, 5-10% carbon fiber, 10-15% graphite, 2-5% grinder ash, 2-5% petroleum coke, 2-5% ultra-high molecular weight polyethylene, and 5-10% metal brazing ceramic powder.

[0008] The present invention is further configured as follows: the metal brazing ceramic powder is processed from copper alloy and silicon carbide through a brazing process, and is ground into powder by a pulverizer and a grinder.

[0009] The present invention is further configured as follows: the solder used for the brazing is a copper-silver alloy.

[0010] The present invention is further configured as follows: the phenolic resin is a phenolic resin of model PF6816.

[0011] The present invention provides a method for preparing a high-strength brake lining as described in the above technical solution, comprising the following steps:

[0012] S1: Ingredients: weigh the amount of various raw materials according to the formula, and dry the surface of the raw materials;

[0013] S2: Mixing: Put the weighed raw materials into the mixer, adjust the speed to maintain at 500-3000rpm, and the mixing time is 20-60 minutes;

[0014] S3: Hot pressing: slowly put the mixed materials into a metal mold preheated to 160-200°C, use a hydraulic press to apply a high pressure of 25-30MPa to the materials, and maintain the pressure for 5-30 minutes under high temperature and high pressure conditions;

[0015] S4: Heat treatment: Place the newly formed brake lining blank into a heat treatment furnace and use a step-by-step heating method, gradually raising the temperature from room temperature to 180-200°C and keeping it for 4-5 hours, and then further cooling it to below 100°C to complete the heat treatment.

[0016] The present invention is further configured to include finishing: performing precision machining of grinding and cutting on the heat-treated brake lining blank, and performing drilling and grooving on the brake lining blank according to design requirements to manufacture the structural features required by the process.

[0017] The present invention provides a method for detecting the strength of a high-strength brake lining as described in the above technical solution, comprising the following steps:

[0018] S1: Material preparation: First, cut the produced lining body, cut the multiple lining bodies to be tested into multiple lining samples of the same volume, and clean the surface of the lining samples to make the testing conditions of the multiple lining samples consistent;

[0019] S2: Impact strength test: Place and clamp the prepared multiple lining samples on an impact strength tester in sequence, impact and collide the lining samples with the impact blade on the impact strength tester, and record the impact strength of the lining samples after the lining samples are broken by the impact blade collision with the dial on the impact strength tester;

[0020] S3: Friction strength test: Place and clamp the prepared multiple lining samples on the friction performance tester in turn, and use the friction performance tester to simulate the actual braking state, so that the friction head on the friction performance tester abuts against the supported lining samples and rotates, and the friction performance and test data of the lining samples are recorded.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention discloses a high-strength brake lining, which is mainly used for being installed on engineering vehicles for braking. After frequent braking and when the temperature of the brake lining fluctuates greatly, the friction coefficient between the brake lining as a whole and the brake disc can be kept stable without large fluctuations, thereby ensuring that the brake lining can provide braking stability under various working conditions and improving driving safety. In addition, due to the stable friction coefficient, the brake lining has the advantage of uniform wear during actual use, and is not prone to local excessive wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the friction temperature and friction coefficient of the brake lining of Example 1 of the present invention under the same number of braking times;

[0024] Figure 2 Schematic diagram of friction temperature and friction coefficient of the brake lining of Example 2 under the same pressure and braking times as Example 1;

[0025] Figure 3 Schematic diagram of the friction temperature and friction coefficient of the brake lining of Example 3 under the same pressure and braking times as Example 1. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Embodiment 1:

[0028] A high-strength brake lining includes a lining body, wherein the components of the lining body include, by mass fraction, 15-25% PF6816 phenolic resin, 10-20% glass fiber, 1-5% aramid pulp, 2-5% antimony sulfide, 5-10% mineral fiber, 5-10% talcum powder, 5-10% barite powder, 1-5% zircon powder, 1-5% nitrile rubber powder, 2-5% tire powder, 2-5% friction powder, 5-10% carbon fiber, 10-15% graphite, 2-5% grinder ash, 2-5% petroleum coke, 2-5% ultra-high molecular weight polyethylene, and 5-10% metal brazing ceramic powder. The metal brazing ceramic powder is made of copper alloy and silicon carbide through a brazing process, and is ground into powder by a pulverizer and a grinder, and the solder used for brazing is a copper-silver alloy.

[0029] A processing technology for high-strength brake linings comprises the following steps:

[0030] S1: Batching: Weigh the amount of various raw materials according to the formula, including resin, fiber reinforcement, lubricant, filler, etc., perform surface treatment or drying on glass fiber, aramid fiber, etc. to improve their compatibility with resin, and use an automated metering system to accurately add various powdered and fibrous raw materials to ensure accurate proportions;

[0031] S2: Mixing: Put the weighed raw materials into a high-speed mixer or a twin-screw extruder for thorough mixing. Under the action of high-speed stirring (the speed is usually 500-3000rpm), each component is thoroughly dispersed and mixed. The mixing time is determined according to the properties of the raw materials and the formula, generally 5-20 minutes. A small amount of solvent or lubricant can be appropriately added during the mixing process to improve the fluidity of the materials and ensure that the mixture has good fluidity and dispersibility, so as to prepare for subsequent molding;

[0032] S3: Hot pressing: slowly put the mixed materials into a metal mold preheated to 160°C, use a hydraulic press or other pressure equipment to apply a high pressure of 25MPa to the materials, maintain the pressure under high temperature and high pressure conditions for 5-30 minutes to promote the cross-linking and curing process of the resin, and hot pressing can be used to produce complex brake pad blanks;

[0033] S4: Heat treatment: Place the newly formed brake pad blank into a heat treatment furnace and use a step-by-step heating method to keep it at a high temperature of 180°C for 4-5 hours, and then further cool it down to below 100°C to complete the heat treatment. High-temperature heat treatment can greatly improve the strength, heat resistance and dimensional stability of the material;

[0034] S5: Finishing: Grinding, cutting and other precision machining are performed on the heat-treated brake pad blanks. Drilling, hollowing and other processing are performed on the brake pads according to the design requirements to produce the required structural features. High-speed cooling technology is required during processing to avoid excessive material loss and deformation, ensuring that the processed brake pads have a fine appearance and high dimensional accuracy;

[0035] S6: Carry out a comprehensive inspection of the appearance, size, weight and other indicators of the finished brake pads, and test its key technical indicators such as wear resistance, friction coefficient, braking performance, etc. Qualified products can be sold after cleaning, rust prevention, packaging and other processes. Establish a complete quality traceability system to ensure stable and reliable product quality.

[0036] Embodiment 2:

[0037] Compared with Example 1, the differences are as follows:

[0038] The components of the lining body include, by mass fraction, 15-25% phenolic resin, 15-20% glass fiber, 2-5% antimony sulfide, 15-20% mineral fiber, 5-10% talcum powder, 5-10% barite powder, 1-5% zircon powder, 2-5% nitrile rubber powder, 2-5% tire powder, 2-5% friction powder, 10-15% graphite, 10-15% grinder ash, and 2-5% petroleum coke.

[0039] Embodiment 3:

[0040] Compared with Example 1, the differences are as follows:

[0041] The components of the lining body include, by mass fraction, 15-25% PF6816 phenolic resin, 10-20% glass fiber, 1-5% aramid pulp, 2-5% antimony sulfide, 5-10% mineral fiber, 5-10% talcum powder, 5-10% barite powder, 1-5% zircon powder, 1-5% nitrile rubber powder, 2-5% tire powder, 2-5% friction powder, 5-10% carbon fiber, 10-15% graphite, 2-5% grinder ash and 2-5% petroleum coke.

[0042] A method for testing the strength of the brake lining described in Embodiment 1, Embodiment 2, and Embodiment 3 comprises the following steps:

[0043] Material preparation: First, cut the lining body produced by the formulations of Example 1, Example 2, and Example 3 and the above-mentioned process, cut the multiple lining bodies to be tested into multiple lining samples of the same volume, and clean the surfaces of the lining samples to ensure that the testing conditions of the multiple lining samples are consistent.

[0044] The impact strength test uses an impact strength testing machine, which is similar to the content disclosed in the invention patent with publication number CN111289390A and name of a cantilever beam impact testing machine.

[0045] The test steps are as follows:

[0046] 1. Calibrate the zero point of the test machine dial so that the pointer points to the zero point of the outer scale when the pendulum falls freely.

[0047] 2. Place and clamp the lining sample on the support of the testing machine so that the back of the notch is subjected to impact load. The impact blade should be hit on the entire width line of the lining sample and aligned with the center line of the lining sample.

[0048] 3. Press the lock hook release button, the pendulum falls naturally, read the dial value pointed by the pointer when the lining sample breaks, that is, the impact energy A, and calculate it as follows: a = A / (B×D), where a = impact strength J / cm 2 , A = impact energy J, B = sample width cm, D = sample thickness cm.

[0049] 5. If the specimen does not break at the notch, the obtained value is invalid and another specimen is required.

[0050] The impact test results are shown in the following table:

[0051] Example 1 Example 2 Example 3 <![CDATA[Impact strength (J / cm 2 )]]> 0.48 0.30 0.35

[0052] It can be seen that Example 1 has higher impact resistance than Example 2 and Example 3.

[0053] Friction strength test: Place and clamp the prepared lining samples on the friction performance tester in turn. Use the friction performance tester to simulate the actual braking state. Make the friction head on the friction performance tester contact and rotate with the supported lining samples, and record the friction performance and test data of the lining samples.

[0054] like Figure 1 , Figure 2 and Figure 3 As shown, there are diagrams of friction temperature (located in the upper diagram ℃) and friction coefficient (located in the lower diagram) of Implementation 1, Implementation 2 and Implementation 3, respectively. The detection method is to simulate a brake disc by a friction head on a friction performance testing machine, and to abut against the lining sample and continuously rotate the detection and recording. In the actual detection, the pressure applied to the above-mentioned Implementation 1, Implementation 2 and Implementation 3 is the same, all of which are 1.45MPa. By recording the number of braking times (uniformly 84 times), the temperature change and friction coefficient change of the lining sample are observed.

[0055] As shown in the following table, according to the detection diagram Figure 1 , Figure 2 and Figure 3 The temperature of the brake lining from the 30th to the 64th braking with large fluctuations is captured:

[0056]

[0057] It can be seen that Example 1 can reach a higher temperature than Example 2 and Example 3, and absorb and dissipate heat faster.

[0058] As shown in the following table, according to the detection diagram Figure 1 , Figure 2 and Figure 3 The friction coefficient of the brake lining from the 30th to the 64th braking with large fluctuations is intercepted:

[0059]

[0060] It can be seen that, compared with Examples 2 and 3, the friction coefficient of Example 1 can be maintained in a relatively small range under changes in temperature and number of braking times, and the friction coefficient is more stable than that of Examples 2 and 3.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high-strength brake lining, characterized in that: The invention comprises a lining body, wherein the components of the lining body include, by mass fraction, 15-25% phenolic resin, 10-20% glass fiber, 1-5% aramid pulp, 2-5% antimony sulfide, 5-10% mineral fiber, 5-10% talcum powder, 5-10% barite powder, 1-5% zircon powder, 1-5% nitrile rubber powder, 2-5% tire powder, 2-5% friction powder, 5-10% carbon fiber, 10-15% graphite, 2-5% grinder ash, 2-5% petroleum coke, 2-5% ultra-high molecular weight polyethylene, and 5-10% metal brazing ceramic powder.

2. A processing technology for a high-strength brake lining according to claim 1, characterized in that: The steps include: S1: Ingredients: weigh the amount of various raw materials according to the formula, and dry the surface of the raw materials; S2: Mixing: Put the weighed raw materials into the mixer, adjust the speed to maintain at 500-3000rpm, and the mixing time is 20-60 minutes; S3: Hot pressing: slowly put the mixed materials into a metal mold preheated to 160-200°C, use a hydraulic press to apply a high pressure of 25-30MPa to the materials, and maintain the pressure for 5-30 minutes under high temperature and high pressure conditions; S4: Heat treatment: Place the newly formed brake lining blank into a heat treatment furnace and use a step-by-step heating method, gradually raising the temperature from room temperature to 180-200°C and keeping it for 4-5 hours, and then further cooling it to below 100°C to complete the heat treatment.

3. The method for testing the strength of a high-strength brake lining according to claim 1, characterized in that: The steps include: S1: Material preparation: First, cut the produced lining body, cut the multiple lining bodies to be tested into multiple lining samples of the same volume, and clean the surface of the lining samples to make the testing conditions of the multiple lining samples consistent; S2: Impact strength test: Place and clamp the prepared multiple lining samples on an impact strength tester in sequence, impact and collide the lining samples with the impact blade on the impact strength tester, and record the impact strength of the lining samples after the lining samples are broken by the impact blade collision with the dial on the impact strength tester; S3: Friction strength test: Place and clamp the prepared multiple lining samples on the friction performance tester in turn, and use the friction performance tester to simulate the actual braking state, so that the friction head on the friction performance tester abuts against the supported lining samples and rotates, and the friction performance and test data of the lining samples are recorded.

4. The high-strength brake lining according to claim 1, characterized in that: The metal brazing ceramic powder is made from copper alloy and silicon carbide through a brazing process and is ground into powder by a pulverizer and a grinder.

5. A high-strength brake lining according to claim 4, characterized in that: The solder used in the brazing is a copper-silver alloy.

6. The high-strength brake lining according to claim 1, characterized in that: The phenolic resin is model PF6816 phenolic resin.

7. The processing technology of a high-strength brake lining according to claim 2, characterized in that: It also includes finishing: precision machining of grinding and cutting of the heat-treated brake lining blanks, and drilling and grooving of the brake lining blanks according to design requirements.

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