A wear-resistant and noise-reducing semi-metallic brake pad and its preparation process

Abstract

The present invention discloses a wear-resistant and noise-reducing semi-metallic-based brake pad, which includes a friction block. A number of slots are formed in the middle of the friction block. A number of anti-slip patterns are provided on the upper surface of the friction block. Chamfers are respectively formed on both sides of the friction block. A bonding layer is provided below the friction block. A back plate is provided below the bonding layer. Corresponding lugs are formed on both sides of the back plate. A gasket is provided below the back plate. A number of corresponding fixing holes are formed on the back plate and the gasket. A number of convex portions are formed on the lower surface of the back plate. A number of concave portions corresponding to the convex portions on the lower surface of the back plate are formed on the upper surface of the backing plate. A sound-absorbing plate is further provided between the back plate and the gasket. A number of through holes are formed in the sound-absorbing plate. The friction block, the bonding layer and the back plate form a bonded block, and the bonded block is bolted to the gasket; the present invention also discloses a preparation process of the wear-resistant and noise-reducing semi-metallic-based brake pad. The brake pad provided by the present invention has high wear resistance and noise reduction performance.

Description

Technical Field

[0001] The present invention relates to a wear-resistant and noise-reducing semi-metallic brake pad and a preparation process thereof, belonging to the technical field of semi-metallic brake friction materials. Background Art

[0002] The brake pad is also called the brake lining. In the braking system of an automobile, the brake pad is the most critical safety component. The quality of all braking effects is determined by the brake pad. Therefore, a good brake pad is the protector of people and automobiles. The working principle of braking mainly comes from friction. By using the friction between the brake pad and the brake disc (drum) and between the tire and the ground, the kinetic energy of the vehicle moving forward is converted into heat energy after friction to stop the vehicle. A set of good and efficient braking systems must be able to provide stable, sufficient, and controllable braking force, and have good hydraulic transmission and heat dissipation capabilities to ensure that the force applied by the driver from the brake pedal can be fully and effectively transmitted to the master cylinder and each slave cylinder, and to avoid hydraulic failure and brake fade caused by high heat.

[0003] When the existing semi-metallic brake pads are in use, the wear rate of the brake pads is very fast, and the increased frequency of replacing the brake pads results in an increase in cost. Moreover, when some semi-metallic brake pads are in use, there is a lot of noise when the brake pads rub against the brake disc (drum). Summary of the Invention

[0004] To solve the deficiencies of the existing technology, the present invention provides a wear-resistant and noise-reducing semi-metallic brake pad and a preparation process thereof, effectively improving the wear resistance and noise reduction performance of the brake pad.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A wear-resistant and noise-reducing semi-metallic brake pad includes a friction block. A plurality of slots are formed in the middle of the friction block. A plurality of anti-slip lines are provided on the upper surface of the friction block. Chamfers are respectively formed on both sides of the friction block. A bonding layer is provided below the friction block. A back plate is provided below the bonding layer. Corresponding lugs are formed on both sides of the back plate. A gasket is provided below the back plate. A plurality of corresponding fixing holes are formed in the back plate and the gasket. A plurality of convex portions are formed on the lower surface of the back plate. A plurality of concave portions corresponding to the convex portions on the lower surface of the back plate are formed on the upper surface of the backing plate. A sound-absorbing plate is further provided between the back plate and the gasket. A plurality of through holes are formed in the sound-absorbing plate. The friction block, the bonding layer, and the back plate form a bonding block, and the bonding block is bolted to the gasket.

[0007] Preferably, a heat-insulating layer is further provided between the friction block and the bonding layer, and the heat-insulating layer can effectively prevent the heat generated during braking from being transmitted to the vehicle piston.

[0008] Further preferably, bumps are formed between two adjacent anti-slip lines, and a plurality of protrusions are formed on the upper surface of the bumps. The bumps and protrusions improve the friction effect between the brake pad and the brake disc (drum).

[0009] Further preferably, a shock-absorbing ring is arranged between the convex part of the back plate and the concave part of the corresponding backing plate. The shock-absorbing ring passes through the through hole on the sound insulation plate. The shock-absorbing ring can effectively reduce the vibration generated when the brake pad rubs against the brake disc (drum), effectively protecting the brake pad and extending its service life.

[0010] Further preferably, reinforcing ribs are arranged along the side surface of the friction block, and the reinforcing ribs improve the mechanical strength of the brake pad.

[0011] Further preferably, thickness warning iron sheets are respectively arranged on the lower surfaces of the two side lugs. The thickness warning iron sheets can effectively give early warning of the wear of the brake pad, remind to replace the brake pad, and avoid accidents.

[0012] A preparation process of a wear-resistant and noise-reducing semi-metallic brake pad comprises the following steps:

[0013] Step 1: Prepare the friction block

[0014] S1: First, grind the following components by weight into powder and put them into a mixer to mix at a rotation speed of 500 - 750 r / min for 1 - 1.5 h. Among them: 40 - 45 parts of steel wool fiber, 1 - 3 parts of iron oxide, 5 - 12 parts of lubricant, and 22 - 30 parts of filler; after mixing, grind the following components by weight into powder and then put them into the mixer to mix at a rotation speed of 800 - 1000 r / min for 2 - 2.5 h to obtain a mixed material. Among them: 2 - 3 parts of silicon-modified phenolic resin, 3 - 3.5 parts of nitrile rubber, 2.2 - 3.2 parts of epoxy resin, 1 - 1.5 parts of silicone resin, 3 - 5 parts of polyimide resin;

[0015] S2: Pour the mixed material obtained in S1 into a mold, use a four-column press, set the pressure to 220 - 350 kg / cm 2 , and carry out hot pressing at a temperature of 190℃ - 220℃ for 4 - 7 min to obtain a semi-finished product;

[0016] S3: Heat-treat the semi-finished product obtained in S2 in an oven at a temperature of 150℃ - 180℃ for 3 - 5 h;

[0017] S4: Grind the edges of the semi-finished product after heat treatment in S3, and carry out corresponding punching, grooving, and chamfering processing to obtain the friction block;

[0018] Step 2: Prepare the bonding block

[0019] Coat the lower surface of the friction block prepared in Step 1 with an adhesive to obtain an adhesive layer and bond it to the finished back plate. Use a four-column press with the pressure set to 100 - 150 kg / cm 2 Take out the friction block, adhesive layer, and back plate after compressing them for 3 - 5 minutes, and then take them out after drying in an oven at a temperature of 80°C - 100°C;

[0020] Step 3: Component assembly

[0021] Connect the bonding block, sound insulation plate, and gasket in sequence with bolts to form a brake pad, and use a punching machine to punch a number of fixing holes in the brake pad to complete the assembly.

[0022] Preferably, the lubricant in Step S1 of Step 1 is a mixture of coke, graphite, molybdenum disulfide, and lead powder mixed in a mass ratio of 2 - 4:1 - 3:0.5 - 1:0.5 - 1.2. Among them, the graphite is a mixture of natural graphite and artificial graphite mixed in a mass ratio of 1.5 - 3:0.8 - 1.2.

[0023] Further preferably, the filler in Step S1 of Step 1 includes the following components in parts by weight: 10 - 15 parts of iron powder and 5 - 8 parts of copper powder.

[0024] Further preferably, in Step S3 of Step 1, when the temperature in the oven is below 120°C, the heating rate is 2°C / min; when the temperature in the oven is above 120°C, the heating rate is 1°C / 2 min.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The brake pad provided by the present invention is provided with a gasket below the back plate, and a number of corresponding fixing holes are formed on the back plate and the gasket. A number of convex parts are formed on the lower surface of the back plate, and a number of concave parts corresponding to the convex parts on the lower surface of the back plate are formed on the upper surface of the backing plate. A sound insulation plate is also provided between the back plate and the gasket, which improves the overall noise reduction effect of the brake pad; a number of protrusions are formed on the upper surface of the convex block, and both the convex block and the protrusions improve the friction effect between the brake pad and the brake disc (drum), and improve the wear resistance of the brake pad;

[0027] 2. The preparation process of the brake pad provided by the present invention uses steel wool fiber as the reinforcing fiber, and adds iron powder and copper powder as the reinforcing base. The addition and proportion of coke, graphite, molybdenum disulfide, and lead powder improve the wear resistance of the brake pad and can effectively reduce noise;

[0028] 3. The preparation process of the brake pad provided by the present invention is reasonably designed and easy to operate, improving the production efficiency. Description of the drawings

[0029] Figure 1This is the front view of the present invention;

[0030] Figure 2 This is the rear view of the present invention;

[0031] Figure 3 This is the structural schematic diagram of the present invention;

[0032] Figure 4 This is the structural schematic diagram of the sound insulation board;

[0033] The meanings of the main reference numerals in the figure are as follows:

[0034] 1. Friction block, 2. Adhesive layer, 3. Back plate, 4. Spacer, 5. Thickness warning iron sheet, 6. Groove, 7. Anti-slip pattern, 8. Chamfer, 9. Ear, 10. Fixing hole, 11. Convex part, 12. Concave part, 13. Sound insulation board, 14. Through hole, 15. Heat insulation layer, 16. Convex block, 17. Shock absorption ring. Detailed implementation manners

[0035] The present invention will be specifically introduced below in conjunction with the drawings and embodiments.

[0036] As Figures 1-4 shown: This embodiment is a wear-resistant and noise-reducing semi-metallic base brake pad, including a friction block 1. Two grooves 6 are formed in the middle of the friction block 1. The grooves 6 improve the heat dissipation effect of the brake pad and can effectively let rainwater flow away along the grooves 6. Twelve anti-slip patterns 7 are arranged on the upper surface of the friction block 1. Refer to Figure 1 , the twelve anti-slip patterns 7 form three groups of anti-slip pattern groups. The two grooves 6 are respectively located between two adjacent anti-slip pattern groups. Chamfers 8 are respectively formed on both sides of the friction block 1. An adhesive layer 2 is arranged below the friction block 1. A back plate 3 is arranged below the adhesive layer 2. Corresponding ears 9 are formed on both sides of the back plate 3. A spacer 4 is arranged below the back plate 3. Two corresponding fixing holes 10 are formed on the back plate 3 and the spacer 4. A plurality of convex parts 11 are formed on the lower surface of the back plate 3. A plurality of concave parts 12 corresponding to the convex parts 11 on the lower surface of the back plate 3 are formed on the upper surface of the backing plate 4. A sound insulation board 13 is further arranged between the back plate 3 and the spacer 4. A plurality of through holes 14 are formed on the sound insulation board 13. The friction block 1, the adhesive layer 2 and the back plate 3 form an adhesive block, and the adhesive block is bolted to the spacer 4.

[0037] Refer to Figure 3 , a heat insulation layer 15 is further arranged between the friction block 1 and the adhesive layer 2.

[0038] Refer to Figure 1 , a convex block 16 is formed between two adjacent anti-slip patterns 7, and a plurality of protrusions are formed on the upper surface of the convex block 16.

[0039] Refer to Figure 3, a shock-absorbing ring 17 is provided between the convex portion 11 of the back plate 3 and the corresponding concave portion 12 of the backing plate 4, and the shock-absorbing ring 17 passes through the through hole 14 in the sound-absorbing plate 13.

[0040] In this embodiment, reinforcing ribs are provided along the side surface of the friction block 1.

[0041] See Figure 1 、 2 、3, thickness warning iron sheets 5 are respectively provided on the lower surfaces of the two side lugs 9.

[0042] This embodiment also discloses a preparation process of a wear-resistant and noise-reducing semi-metallic base brake pad, which is as follows:

[0043] Preparation process one

[0044] A preparation process of a wear-resistant and noise-reducing semi-metallic base brake pad includes the following steps:

[0045] Step one: Prepare the friction block

[0046] S1: First, grind the following components by weight and put them into a mixer to mix at a speed of 500 r / min for 1 h. Among them: 40 parts of steel wool fiber, 1 part of iron oxide, 5 parts of lubricant, and 22 parts of filler; after mixing, grind the following components by weight and put them into the mixer to obtain a mixed material at a speed of 800 r / min for 2 h. Among them: 2 parts of silicon-modified phenolic resin, 3 parts of nitrile rubber, 2.2 parts of epoxy resin, 1 part of silicone resin, and 3 parts of polyimide resin;

[0047] S2: Pour the mixed material obtained in S1 into a mold, use a four-column press, set the pressure to 220 kg / cm 2 , and perform hot pressing at a temperature of 190 °C for 4 min to obtain a semi-finished product;

[0048] S3: Heat-treat the semi-finished product obtained in S2 in an oven at a temperature of 150 °C for 3 h;

[0049] S4: Grind the edges of the semi-finished product after heat treatment in S3, and perform corresponding punching, grooving, and chamfering processing to obtain the friction block 1;

[0050] Step two: Prepare the bonding block

[0051] Coat the lower surface of the friction block 1 prepared in step one with an adhesive to obtain a bonding layer 2 and bond it with the finished back plate 3, and use a four-column press, set the pressure to 100 kg / cm 2 Press the friction block 1, the bonding layer 2, and the back plate 3 for 3 min and then take them out, and then dry them in an oven at a temperature of 80 °C and take them out;

[0052] Step 3: Component Assembly

[0053] Use bolts to connect the bonding block, sound insulation plate 13, and gasket 4 in sequence to form a brake pad, and use a punching machine to punch two fixing holes 10 in the brake pad to complete the assembly.

[0054] In this implementation process, the lubricant in step S1 of step one is a mixture of coke, graphite, molybdenum disulfide, and lead powder mixed in a mass ratio of 2:1:0.5:0.5. Among them, the graphite is a mixture of natural graphite and artificial graphite mixed in a mass ratio of 1.5:0.8.

[0055] The filler in step S1 of step one in this implementation process includes the following components in parts by weight: 10 parts of iron powder and 5 parts of copper powder.

[0056] In step S3 of step one in this implementation process, when the temperature in the oven is below 120°C, the heating rate is 2°C / min; when the temperature in the oven is above 120°C, the heating rate is 1°C / 2min.

[0057] Preparation Process Two

[0058] A preparation process for a wear-resistant and noise-reducing semi-metallic brake pad includes the following steps:

[0059] Step 1: Prepare the friction block

[0060] S1: First, grind the following components in parts by weight and put them into a mixer to mix at a rotation speed of 750 r / min for 1.5 h. Among them: 45 parts of steel wool fiber, 3 parts of iron oxide, 12 parts of lubricant, and 30 parts of filler; after mixing, grind the following components in parts by weight and put them into the mixer to obtain a mixed material at a rotation speed of 1000 r / min for 2.5 h. Among them: 3 parts of silicon-modified phenolic resin, 3.5 parts of nitrile rubber, 3.2 parts of epoxy resin, 1.5 parts of silicone resin, and 5 parts of polyimide resin;

[0061] S2: Pour the mixed material obtained in S1 into a mold, use a four-column press, set the pressure to 350 kg / cm 2 And perform hot pressing at a temperature of 220°C for 7 min to obtain a semi-finished product;

[0062] S3: Heat-treat the semi-finished product obtained in S2 in an oven at a temperature of 180°C for 5 h;

[0063] S4: Grind the edges of the semi-finished product after heat treatment in S3, and perform corresponding punching, grooving, and chamfering processing to obtain the friction block 1;

[0064] Step 2: Prepare the bonding block

[0065] Coat the lower surface of the friction block 1 prepared in Step 1 with an adhesive to obtain an adhesive layer 2 and bond it to the finished back plate 3. Use a four-column press with a pressure set at 150 kg / cm 2 After compacting the friction block 1, the adhesive layer 2, and the back plate 3 for 5 minutes, take them out, and then dry them in an oven at a temperature of 100 °C and take them out;

[0066] Step 3: Component assembly

[0067] Connect the bonding block, the sound insulation plate 13, and the gasket 4 in sequence with bolts to form a brake pad, and use a punching machine to punch two fixing holes 10 in the brake pad to complete the assembly.

[0068] In this implementation process, the lubricant in Step S1 of Step 1 is a mixture of coke, graphite, molybdenum disulfide, and lead powder mixed in a mass ratio of 4:3:1:1.2. Among them, the graphite is a mixture of natural graphite and artificial graphite mixed in a mass ratio of 3:1.2.

[0069] In this implementation process, the filler in Step S1 of Step 1 includes the following components in parts by weight, where: 15 parts of iron powder and 8 parts of copper powder.

[0070] In Step S3 of this implementation process, when the temperature in the oven is below 120 °C, the heating rate is 2 °C / min; when the temperature in the oven is above 120 °C, the heating rate is 1 °C / 2 min.

[0071] Preparation process three

[0072] A preparation process for a wear-resistant and noise-reducing semi-metallic brake pad, including the following steps:

[0073] Step 1: Prepare the friction block

[0074] S1: First, grind the following components in parts by weight and put them into a mixer to mix at a rotation speed of 650 r / min for a mixing time of 1.2 h, where: 42 parts of steel wool fiber, 2 parts of iron oxide, 8 parts of lubricant, and 27 parts of filler; after mixing, grind the following components in parts by weight and put them into the mixer to obtain a mixed material at a rotation speed of 900 r / min for a mixing time of 2.2 h, where: 2.5 parts of silicon-modified phenolic resin, 3.3 parts of nitrile rubber, 2.7 parts of epoxy resin, 1.2 parts of silicone resin, and 4 parts of polyimide resin;

[0075] S2: Pour the mixed material obtained in S1 into a mold, use a four-column press with a pressure set at 300 kg / cm 2 , and perform hot pressing at a temperature of 210 °C for 5 minutes to obtain a semi-finished product;

[0076] S3: Heat-treat the semi-finished product obtained in S2 in an oven at a temperature of 165 °C for a heat-treatment time of 4 h;

[0077] S4: Perform edge grinding on the semi-finished product after heat treatment in S3, and carry out corresponding hole punching, slotting, and chamfering processing to obtain the friction block 1;

[0078] Step Two: Prepare the bonding block

[0079] Coat the lower surface of the friction block 1 prepared in Step One with an adhesive to obtain the bonding layer 2 and bond it with the finished back plate 3, and use a four-column press with the pressure set at 125 kg / cm 2 Take out the friction block 1, bonding layer 2, and back plate 3 after compaction for 4 minutes, and then take them out after drying in an oven at a temperature of 90 °C;

[0080] Step Three: Component assembly

[0081] Use bolts to sequentially connect the bonding block, sound insulation plate 13, and gasket 4 to form a brake pad, and use a punching machine to punch two fixing holes 10 in the brake pad to complete the assembly.

[0082] In this implementation process, the lubricant in the S1 step of Step One is a mixture of coke, graphite, molybdenum disulfide, and lead powder mixed in a mass ratio of 3:2:0.8:0.9. Among them, the graphite is a mixture of natural graphite and artificial graphite mixed in a mass ratio of 2:1.

[0083] The filler in the S1 step of Step One in this implementation process includes the following components in parts by weight, where: 12 parts of iron powder and 6 parts of copper powder.

[0084] In the S3 step of Step One in this implementation process, when the temperature in the oven is below 120 °C, the heating rate is 2 °C / min; when the temperature in the oven is above 120 °C, the heating rate is 1 °C / 2 min.

[0085] Number the brake pads obtained by Preparation Process One, Preparation Process Two, and Preparation Process Three as 1#, 2#, and 3# respectively, number the existing semi-metallic brake pads as 4#, and conduct various index tests respectively. The specific test results are shown in the following table:

[0086]

[0087] The most important performance index of a brake pad is the friction coefficient. Our national standard stipulates that the friction coefficient of a brake pad is between 0.35 - 0.45. For a qualified brake pad, the friction coefficient is moderate and stable. If the friction coefficient is lower than 0.35, the braking distance will exceed the safe braking distance or even the brakes will fail during braking. If the friction coefficient is higher than 0.45, the brakes are likely to lock suddenly, resulting in a rollover accident.

[0088] It can be seen that the brake pads produced by this implementation preparation process have a great improvement in the friction coefficient compared with the existing brake pads!

[0089] A wear-resistant and noise-reducing semi-metallic base brake pad provided by the present invention is provided with a gasket below the back plate. Two corresponding fixing holes are formed on the back plate and the gasket. A plurality of convex parts are formed on the lower surface of the back plate, and a plurality of concave parts corresponding to the convex parts on the lower surface of the back plate are formed on the upper surface of the backing plate. A sound insulation board is also arranged between the back plate and the gasket, which improves the overall noise reduction effect of the brake pad; a plurality of protrusions are formed on the upper surface of the bump, and both the bump and the protrusions improve the friction effect between the brake pad and the brake disc (drum), and improve the wear resistance of the brake pad; a preparation process of a wear-resistant and noise-reducing semi-metallic base brake pad provided by the present invention uses steel wool fiber as the reinforcing fiber, and adds iron powder and copper powder as the reinforcing base. The addition and proportion of coke, graphite, molybdenum disulfide, and lead powder improve the wear resistance of the brake pad and can effectively reduce noise; the preparation process is reasonably designed and simple to operate, improving the production efficiency.

[0090] The above are only the preferred embodiments of the present invention patent. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention patent, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention patent.

Claims

1. A wear-resistant and noise-reducing semi-metallic-based brake pad, characterized in that: It includes a friction block. A number of slots are formed in the middle of the friction block. A number of anti-slip lines are provided on the upper surface of the friction block. Chamfers are respectively formed on both sides of the friction block. A bonding layer is provided below the friction block. A back plate is provided below the bonding layer. Corresponding lugs are formed on both sides of the back plate. A gasket is provided below the back plate. A number of corresponding fixing holes are formed on the back plate and the gasket. A number of convex parts are formed on the lower surface of the back plate. A number of concave parts corresponding to the convex parts on the lower surface of the back plate are formed on the upper surface of the gasket. A sound insulation plate is also provided between the back plate and the gasket. A number of through holes are formed on the sound insulation plate. The friction block, the bonding layer and the back plate form a bonding block, and the bonding block is bolted to the gasket; Among them, the friction block includes the following components in parts by weight: 40-45 parts of steel wool fiber, 1-3 parts of iron oxide, 5-12 parts of lubricant, 22-30 parts of filler, 2-3 parts of silicon-modified phenolic resin, 3-3.5 parts of nitrile rubber, 2.2-3.2 parts of epoxy resin, 1-1.5 parts of silicone resin and 3-5 parts of polyimide resin; The lubricant is a mixture of coke, graphite, molybdenum disulfide and lead powder mixed in a mass ratio of 2-4:1-3:0.5-1:0.5-1.2; The filler includes the following components in parts by weight: 10-15 parts of iron powder and 5-8 parts of copper powder.

2. The wear-resistant and noise-reducing semi-metallic-based brake pad according to claim 1, wherein A heat insulation layer is also provided between the friction block and the bonding layer.

3. The wear-resistant and noise-reducing semi-metallic matrix brake pad according to claim 1, wherein A convex block is formed between adjacent anti-slip lines, and a number of protrusions are formed on the upper surface of the convex block.

4. A wear-resistant and noise-reducing semi-metallic base brake pad according to claim 1, characterized in that, A shock-absorbing ring is provided between the convex part of the back plate and the corresponding concave part of the gasket, and the shock-absorbing ring passes through the through hole on the sound insulation plate.

5. A wear-resistant and noise-reducing semi-metallic-based brake pad according to claim 1, wherein Reinforcing ribs are arranged along the side surface of the friction block.

6. The wear-resistant and noise-reducing semi-metallic base brake pad according to claim 1, characterized in that, Thickness warning iron sheets are respectively provided on the lower surfaces of the lugs on both sides.

7. The preparation process of a wear-resistant and noise-reducing semi-metallic-based brake pad according to claim 1, characterized in that, It includes the following steps: Step 1: Prepare the friction block S1: First, grind the following components in parts by weight and put them into a mixer and mix at a rotation speed of 500-750 r / min for a mixing time of 1-1.5 h, where: 40-45 parts of steel wool fiber, 1-3 parts of iron oxide, 5-12 parts of lubricant and 22-30 parts of filler; after mixing, then grind the following components in parts by weight and put them into the mixer and mix at a rotation speed of 800-1000 r / min for a mixing time of 2-2.5 h to obtain a mixed material, where: 2-3 parts of silicon-modified phenolic resin, 3-3.5 parts of nitrile rubber, 2.2-3.2 parts of epoxy resin, 1-1.5 parts of silicone resin, 3-5 parts of polyimide resin; S2: Pour the mixed material obtained in S1 into a mold, and use a four-column press with the pressure set at 220 - 350 kg / cm 2 , and perform hot pressing at a temperature of 190°C - 220°C for 4 - 7 minutes to obtain a semi-finished product; S3: Heat-treat the semi-finished product obtained in S2 in an oven at a temperature of 150°C-180°C for a heat-treatment time of 3-5 h; S4: Grind the edge of the semi-finished product heat-treated in S3, and perform corresponding punching, slotting and chamfering processing to obtain the friction block; Step 2: Prepare the bonding block Apply an adhesive to the lower surface of the friction block prepared in Step 1 to obtain an adhesive layer and bond it to the finished backplate. Use a four-column press with the pressure set to 100 - 150 kg / cm 2 Take out the friction block, adhesive layer, and backplate after compressing them for 3 - 5 minutes, and then take them out after drying in an oven at a temperature of 80°C - 100°C; Step 3: Component assembly Connect the bonding block, the sound insulation plate and the gasket in sequence with bolts to form a brake pad, and punch a number of fixing holes (10) on the brake pad to complete the assembly.

8. The preparation process of a wear-resistant and noise-reducing semi-metallic-based brake pad according to claim 7, characterized in that, The lubricant in step S1 of step one is a mixture of coke, graphite, molybdenum disulfide, and lead powder mixed in a mass ratio of 2 - 4:1 - 3:0.5 - 1:0.5 - 1.

2. Among them, the graphite is a mixture of natural graphite and artificial graphite mixed in a mass ratio of 1.5 - 3:0.8 - 1.

2.

9. The preparation process of a wear-resistant and noise-reducing semi-metallic-based brake pad according to claim 7, characterized in that, The filler in step S1 of step one includes the following components in parts by weight: 10 - 15 parts of iron powder and 5 - 8 parts of copper powder.

10. The preparation process of a wear-resistant and noise-reducing semi-metallic-based brake pad according to claim 7, characterized in that, In step S3 of step one, when the temperature in the oven is below 120°C, the heating rate is 2°C / min; when the temperature in the oven is above 120°C, the heating rate is 1°C every 2 min.

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