Pressurized sintering furnace for powder metallurgy brake pad friction body components

Abstract

The invention relates to the field of processing and manufacturing of railway product parts, and specifically to a pressurized sintering furnace for a powder metallurgy brake pad friction body assembly. A circular water tank is provided on a base, an inner tank with an opening at the lower end is provided above the water tank, a round table is coaxially fixedly installed in the water tank, a flared opening matching the round table is provided at the lower end of the inner tank, a plurality of graphite disks for placing friction body assemblies are arranged between the round table and the top of the inner tank, a heating hood and a cooling hood for pressing the inner tank are detachably installed on the base, and a pressurizing assembly for pressurizing the heating hood or the cooling hood is also provided on the base; the sintering furnace of the invention can cool the product by combining water cooling and air cooling, thereby shortening the cooling time of the product after sintering, prolonging the effective use time of the inner tank of the sintering furnace, and improving the output of the product.

Description

Technical Field

[0001] The invention relates to the field of processing and manufacturing railway product parts, and in particular to a pressurized sintering furnace for a powder metallurgy brake pad friction body assembly. Background Art

[0002] In recent years, my country's high-speed railway has made rapid and substantial development. The mileage of high-speed railway is close to 20,000 kilometers, covering cities with a population of more than 500,000. my country will enter the high-speed railway era.

[0003] As train speeds increase, how to safely stop high-speed trains is an important issue related to the safety of life and property. Train braking includes resistance braking, magnetic rail braking, eddy current braking, friction braking and other methods, among which friction braking is indispensable. Friction braking converts kinetic energy into heat energy through friction and then dissipates it into the atmosphere. The friction braking of high-speed trains usually adopts disc braking, which uses the mutual friction between the brake disc and the brake pad to consume the train's kinetic energy. Therefore, the performance of these two components has become an important aspect related to the safety of train operation.

[0004] The high-speed EMUs currently in operation on China Railway mainly include CRH1, CRH2, CRH3, and CRH5 series, all of which use disc brakes. The powder metallurgy brake pads for high-speed EMUs can be divided into two types of powder metallurgy brake pads: dovetail type and non-dovetail type according to the shape of the installation interface. Both types of brake pads are made by assembling the steel back assembly and the friction body assembly.

[0005] The friction body assembly is mainly composed of the friction body and the skeleton assembly, which are sintered through the sintering process. In the entire brake pad manufacturing process, the sintering process is a crucial process. The sintering process not only affects the appearance and size of the friction body assembly, but also affects the mechanical and physical properties and friction and wear properties of the friction body. Therefore, the sintering process is identified as a special process. After the sintering is completed, the friction body assembly needs to undergo a destructive test to detect whether its mechanical and physical properties meet the requirements of relevant standards.

[0006] At present, the equipment used in the sintering process of friction body components is mainly divided into two types: chain furnace and pressure sintering furnace. Since the friction body components need to be continuously pressurized during the sintering process, and the chain furnace pressurization method can only use the physical pressurization method of the tooling, which cannot ensure the stability of the pressure during the sintering process, the pressure sintering furnace is currently the preferred equipment for the sintering process of friction body components. However, there is no sintering furnace specially designed for the sintering process of friction body components on the market, which greatly affects the output and quality of the sintering process of friction body components. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a pressure sintering furnace for a powder metallurgy brake pad friction body assembly, so as to improve the sintering quality of the friction body assembly and solve the problems in the prior art.

[0008] In order to solve the above technical problems, the technical solution of the present invention is: a pressurized sintering furnace for a powder metallurgy brake pad friction body assembly comprises a base, a circular water tank is provided on the base, an inner tank with an open lower end is provided above the water tank, the inner tank is in a cylindrical state, a truncated table is coaxially fixedly installed in the water tank, a flared opening matching the truncated table is provided at the lower end of the inner tank, a plurality of graphite disks for placing friction body assemblies are arranged between the truncated table and the top of the inner tank, a plurality of placement grooves for placing friction body assemblies are provided on the top of the graphite disk; a heating hood and a cooling hood for pressing the inner tank are detachably installed on the base, and a pressurizing assembly for pressurizing the heating hood or the cooling hood is also provided on the base.

[0009] As a further improvement, the bottom of the placement groove is provided with a positioning hole matching the positioning column of the skeleton assembly; the graphite disk is also provided with a graphite limit ring, the lower end of the graphite limit ring is coaxially provided with an annular protrusion, and the graphite disk is provided with a circular groove matching the protrusion.

[0010] As a further improvement, a plurality of support blocks matching the heating hood or the cooling hood are fixedly installed on the inner wall of the water tank at uniform intervals in the circumferential direction; two columns are fixedly installed on the base, and the two columns are relatively arranged on the left and right sides of the water tank, and vertically extending guide strips are fixedly installed on the inner sides of the two columns respectively; two first positioning blocks are relatively fixedly installed on the left and right sides of the heating hood, and the first positioning blocks are provided with first positioning grooves matching the guide strips; two second positioning blocks are relatively fixedly installed on the left and right sides of the cooling hood, and the second positioning blocks are provided with second positioning grooves matching the guide strips; two positioning claws extending to the outside of the water tank are relatively fixedly installed on the left and right sides of the expanded mouth of the inner tank, and the positioning claws are provided with third positioning grooves matching the guide strips; the pressurizing assembly is arranged between the tops of the two columns.

[0011] As a preferred technical solution, the pressurizing assembly includes a mounting seat located between the upper ends of the two columns, wherein a vertically extending rotating shaft is fixedly installed on the upper end of one of the columns, and a rotating sleeve matching the rotating shaft is provided at one end of the mounting seat, and a positioning seat is fixedly installed on the upper end of the other column, and a positioning groove is provided on the positioning seat matching the end of the mounting seat away from the rotating sleeve; a downwardly extending hydraulic jack is fixedly installed in the middle position of the mounting seat.

[0012] As a preferred technical solution, the heating hood includes a cylindrical heating hood body, two first positioning blocks are fixedly installed on the left and right sides of the heating hood body, a heating hood cover plate is fixedly installed on the upper end of the heating hood body, an inner tank clamping device is provided on the heating hood cover plate, an annular support plate is coaxially fixedly installed on the inner side of the lower end of the heating hood body, a plurality of annular refractory brick layers are arranged on the support plate, the refractory brick layer is coaxially arranged with the heating hood body and the inner diameter of the refractory brick layer matches the upper end of the inner tank, a placement groove for placing a heating resistance wire is provided on the refractory brick layer, and a fireproof material is filled between the outer side of the refractory brick layer and the heating hood body.

[0013] As a further improvement, the front side of the heating hood cylinder is provided with a plurality of through holes for the wires of the heating resistance wire to pass through, a protective plate is fixedly installed on the outer side of the heating hood cylinder at positions corresponding to the positions of the plurality of through holes, and sleeves are respectively fixedly installed on the protective plate at positions corresponding to the plurality of through holes.

[0014] A circular hole is coaxially provided on the heating cover plate, and the inner liner clamping device located between the pressurizing assembly and the inner liner is provided in the circular hole. The inner liner clamping device comprises an insulating barrel with an upper opening, the insulating barrel is filled with insulating material, an insulating barrel cover is fixedly installed on the top of the insulating barrel, a cold water trough is also fixedly installed below the insulating barrel cover, and an inlet pipe and an outlet pipe, one end of which is connected to the cold water trough, are fixedly installed on the insulating barrel cover.

[0015] As a preferred technical solution, the cooling hood includes a cylindrical cooling hood body, two second positioning blocks are fixedly installed on the left and right sides of the cooling hood body, a pressure plate for pressing the inner tank is fixedly installed on the upper end of the cooling hood body, an air inlet pipe is fixedly installed on the outer peripheral surface of the cooling hood body, and a plurality of air outlet holes are provided on the pressure plate.

[0016] As a further improvement, a pressure top for bearing the pressure of the pressurizing assembly is further provided above the press plate, and the thickness of the pressure top is greater than the thickness of the press plate.

[0017] Due to the adoption of the above technical scheme, a pressurized sintering furnace for a friction body assembly of a powder metallurgy brake pad comprises a base, a circular water tank is provided on the base, an inner tank with an opening at the lower end is provided above the water tank, a round table is coaxially fixedly installed in the water tank, a flared opening matching the round table is provided at the lower end of the inner tank, a plurality of graphite disks for placing friction body assemblies are arranged between the round table and the top of the inner tank, a heating hood and a cooling hood for pressing the inner tank are detachably installed on the base, and a pressurizing assembly for pressurizing the heating hood or the cooling hood is also provided on the base; the sintering furnace of the present invention can cool the product by combining water cooling and air cooling, thereby shortening the cooling time of the product after sintering and prolonging the cooling time. The effective use time of the sintering furnace liner is prolonged, and the output of the product is improved; the heating cover plate of the present invention is provided with an liner pressing device, the insulation barrel is filled with insulation material, and a cold water tank for holding cooling water is fixedly installed under the insulation barrel cover to ensure that the hydraulic top will not be affected by high temperature during the sintering process, resulting in unstable pressure; a protective plate is fixedly installed at the outer side of the heating cover cylinder of the present invention corresponding to the positions of multiple through holes, and sleeves are fixedly installed at the positions of the protective plate corresponding to the positions of the multiple through holes, respectively, and the sleeves can protect the wires; a pressure top for bearing the pressure of the pressurizing component is provided above the pressure plate of the present invention, and the thickness of the pressure top is greater than the thickness of the pressure plate, which can prevent the pressure plate from being deformed by the pressure of the hydraulic top. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 is a schematic top view of a base according to an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of an inner container according to an embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of a graphite disk according to an embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of a graphite fiber ring according to an embodiment of the present invention;

[0024] Figure 6 is a schematic structural diagram of a heating hood according to an embodiment of the present invention;

[0025] Figure 7 is a schematic structural diagram of a refractory brick layer according to an embodiment of the present invention;

[0026] Figure 8 is a schematic structural diagram of an inner liner pressing device according to an embodiment of the present invention;

[0027] Fig. 9 is a schematic structural diagram of a cooling cover according to an embodiment of the present invention;

[0028] Fig.10 1 is a schematic top view of a cooling cover according to an embodiment of the present invention.

[0029] In the figure: 1-base; 2-water tank; 3-inner tank; 4-round table; 5-expansion; 6-graphite plate; 7-placement groove; 8-mounting hole; 9-notch; 10-air inlet; 11-air outlet; 12-heating cover; 13-cooling cover; 14-pressurizing assembly; 15-positioning hole; 16-graphite limit ring; 17-protrusion; 18-round groove; 19-support block; 20-column; 21-guide strip; 22-first positioning block; 23-first positioning groove; 24-second positioning block; 25-second positioning groove; 26-positioning claw; 27-third positioning groove; 28-mounting seat; 29-rotating shaft; 30-rotating sleeve; 31-positioning seat; 32-positioning groove; 33-hydraulic top; 34-heating hood cylinder; 35-heating hood cover; 36-liner pressing device; 37-support plate; 38-refractory brick layer; 39-placing groove; 40-through hole; 41-fireproof material; 42-through hole; 43-protective plate; 44-sleeve; 45-round hole; 46-insulating barrel; 47-insulating barrel cover; 48-cold water tank; 49-insulating material; 50-cooling hood cylinder; 51-pressing plate; 52-air inlet pipe; 53-air outlet hole; 54-pressing top; 55-water inlet pipe; 56-water outlet pipe; 57-pressing block; 58-limiting plate; 59-pad. DETAILED DESCRIPTION

[0030] like Figures 1 to 10As shown, a pressurized sintering furnace for a powder metallurgy brake pad friction body assembly comprises a base 1, on which a circular water tank 2 is provided, the water tank 2 is connected to a cooling water circulation system, an inner tank 3 with an opening at the lower end is provided above the water tank 2, the inner tank 3 is in a cylindrical state, a frustum 4 is coaxially fixedly installed in the water tank 2, a flared opening 5 matching the frustum 4 is provided at the lower end of the inner tank 3, the flared opening 5 of the inner tank 3 extends below the liquid level of the water tank 2, and is used to ensure the airtightness of the inner tank 3 during the pressurized sintering process, and in addition, during the pressurized cooling process, the cooling water circulation system is opened to cool the inner tank 3. A plurality of graphite disks 6 for placing friction body assemblies are arranged between the truncated cone 4 and the top of the inner liner 3. The top of the graphite disk 6 is provided with a plurality of placement grooves 7 for placing friction body assemblies. The shape of the placement grooves 7 is set according to the shape of the friction body assembly. In this embodiment, the base 1 is also provided with three mounting holes 8 that penetrate the truncated cone 4 upwards, which are used to install thermocouples so as to read the temperature in the inner liner 3. The edge of the graphite disk 6 is provided with a notch 9 for the thermocouple to pass through to prevent damage to the thermocouple. In addition, the base 1 is provided with an air inlet 10 and an air outlet 11 that penetrate the truncated cone 4 upwards so as to pass hydrogen and nitrogen mixed gas into the inner liner 3 to ensure that the metal material inside the friction body assembly will not produce an oxidation-reduction reaction during the pressurized sintering process. The base 1 is detachably provided with a heating cover 12 and a cooling cover 13 for pressing the inner liner. The base 1 is also provided with a pressurizing component 14 for pressurizing the heating cover 12 or the cooling cover 13.

[0031] A positioning hole 15 matching the positioning column of the skeleton assembly is provided at the bottom of the placement groove 7; a graphite limit ring 16 is also provided on the graphite disk 6 to prevent the product from being subjected to excessive pressure during the sintering process, which may cause the product to have unqualified thickness dimensions; an annular protrusion 17 is coaxially provided at the lower end of the graphite limit ring 16, and a circular groove 18 matching the protrusion 17 is provided on the graphite disk 6 to prevent the graphite limit ring 16 from deviating and affecting the product.

[0032] A plurality of support blocks 19 matching the heating cover 12 or the cooling cover 13 are fixedly mounted at even intervals on the inner wall of the water tank 2 in the circumferential direction to support the heating cover 12 or the cooling cover 13 . Two columns 20 are fixedly installed on the base 1, and the two columns 20 are relatively arranged on the left and right sides of the water tank 2; in order to ensure that the heating cover 12 or the cooling cover 13 is in a coaxial state with the inner tank 3 during the sintering operation, the inner sides of the two columns 20 are respectively fixedly installed with vertically extending guide strips 21, and two first positioning blocks 22 are relatively fixedly installed on the left and right sides of the heating cover 12, and the first positioning blocks 22 are provided with a first positioning groove 23 matching the guide strip 21, and two second positioning blocks 24 are relatively fixedly installed on the left and right sides of the cooling cover 13, and the second positioning blocks 24 are provided with a second positioning groove 25 matching the guide strip 21, and two positioning claws 26 are relatively fixedly installed on the left and right sides of the expansion 5 of the inner tank 3, and the two positioning claws 26 extend to the outside of the water tank 2 through the gap between the heating cover 12 and the inner wall of the water tank 2 or through the gap between the cooling cover 13 and the inner wall of the water tank 2, and the positioning claws 26 are provided with a third positioning groove 27 matching the guide strip 21. The pressurizing assembly 14 is disposed between the tops of the two columns 20 .

[0033] The pressurizing assembly 14 includes a mounting seat 28 located between the upper ends of the two columns 20, wherein a vertically extending rotating shaft 29 is fixedly mounted on the upper end of one of the columns 20, and a rotating sleeve 30 matching the rotating shaft 29 is provided at one end of the mounting seat 28, and one end of the mounting seat 28 can rotate around the rotating shaft 29 to facilitate the disassembly and assembly of the heating cover 12, the cooling cover 13 and the liner 3; a positioning seat 31 is fixedly mounted on the upper end of the other column 20, and a positioning groove 32 matching one end of the mounting seat 28 away from the rotating sleeve 30 is provided on the positioning seat 31 for supporting the end of the mounting seat 28; a downwardly extending hydraulic jack 33 is fixedly mounted in the middle position of the mounting seat 28.

[0034] The heating hood 12 includes a cylindrical heating hood body 34, two first positioning blocks 22 are fixedly installed on the left and right sides of the heating hood body 34, a heating hood cover plate 35 is fixedly installed on the upper end of the heating hood body 34, and an inner tank pressing device 36 is provided on the heating hood cover plate 35, and an annular support plate 37 is coaxially fixedly installed on the inner side of the lower end of the heating hood body 34, and a plurality of annular refractory brick layers 38 are arranged on the support plate 37, and the refractory brick layer 38 is composed of a plurality of fan-shaped refractory bricks, the refractory brick layer 38 is coaxially arranged with the heating hood body 34, and the inner diameter of the refractory brick layer 38 matches the upper end of the inner tank 3, and an annular limiting plate 58 is also coaxially fixedly installed on the support plate 37 to facilitate the positioning between the refractory brick layer 38 and the support plate 37, and a placement groove 39 for placing a heating resistance wire is provided on the refractory brick layer 38. In this embodiment, the support An annular pad 59 is provided between the plate 37 and the bottommost refractory brick layer 38, so that the heating resistance wire of the bottommost refractory brick layer 38 is exposed above the limiting plate 58. The placement groove 39 is in the shape of an arc coaxially arranged with the refractory brick layer 38. The outer side of the refractory brick layer 38 is provided with two through holes 40 connecting the two ends of the placement groove 39 so that the wires connected to the two ends of the heating resistance wire can pass through. The total height of the multiple refractory brick layers 38 is obtained according to the total height of all the graphite disks 6 and the effective temperature zone of the multiple refractory brick layers 38, so as to save electricity. An annular pressing block 57 is also provided between the heating cover plate 35 and the refractory brick layer 38 located at the top, so as to press the refractory brick layer 38. Preferably, the height of each refractory brick layer 38 is equal to the distance between two adjacent graphite disks 6, so that the friction body assembly on each layer of the graphite disk 6 can be evenly heated. The outer side of the refractory brick layer 38 and the heating hood cylinder 34 are filled with a fireproof material 41 for isolating the heat inside the heating hood 12 during the pressure sintering operation to ensure that the friction body assembly is heated evenly. In this embodiment, the fireproof material 41 is mainly aramid fiber.

[0035] The front side of the heating cover cylinder 34 is provided with a plurality of through holes 42 for the wires of the heating resistance wire to pass through. A protective plate 43 is fixedly installed on the outer side of the heating cover cylinder 34 at the positions corresponding to the plurality of through holes 42. Sleeves 44 are fixedly installed on the protective plate 43 at the positions corresponding to the plurality of through holes 42. The protective plate 43 is in an arc shape that fits the heating cover cylinder 34. The sleeve 44 is arranged perpendicular to the heating cover cylinder 34 and the sleeve 44 is connected with the corresponding through hole 42. The wires at both ends of the heating resistance wire pass through the through hole 40 and then pass through the through hole 42 and the sleeve 44 in turn to extend to the outside of the heating cover 12. The sleeve 44 is used to protect the wires.

[0036] The heating cover plate 35 is coaxially provided with a circular hole 45, and the circular hole 45 is provided with the inner liner pressing device 36 located between the pressurizing assembly 14 and the inner liner 3, and the inner liner pressing device 36 includes an insulating barrel 46 with an upper opening, and the insulating barrel 46 is filled with an insulating material 49, and an insulating barrel cover plate 47 is fixedly installed on the top of the insulating barrel 46 for bearing the pressure of the pressurizing assembly 14, and a cold water tank 48 is also fixedly installed below the insulating barrel cover plate 47 for storing cooling water, and the insulating barrel cover plate 47 is fixedly installed on the top of the insulating barrel 46 for storing cooling water. A water inlet pipe 48 and a water outlet pipe 49 are fixedly installed, each of which has one end connected to the cold water tank 48. During the pressure sintering process, the hydraulic top 33 applies pressure downward to the inner liner clamping device 36, and the inner liner clamping device 36 transmits the pressure to the inner liner 3, and the graphite disk 6 is pressurized through the inner liner 3. Cooling water is passed into the cold water tank 48 to ensure that the hydraulic top 33 will not be affected by high temperature during the sintering process, resulting in unstable pressure. The insulation material 49 is also used to protect the hydraulic top 33 from being affected by high temperature.

[0037] The cooling hood 13 includes a cylindrical cooling hood body 50, two of the second positioning blocks 24 are fixedly mounted on the left and right sides of the cooling hood body 50, a pressing plate 51 for pressing the inner tank 3 is fixedly mounted on the upper end of the cooling hood body 50, an air inlet pipe 52 for connecting to an air cooler is fixedly mounted on the outer peripheral surface of the cooling hood body 50, and a plurality of air outlet holes 53 are provided on the pressing plate 51 for enhancing heat dissipation.

[0038] A pressure top 54 for bearing the pressure of the pressurizing assembly 14 is also provided above the press plate 51. The pressure top 54 is circular, and the thickness of the pressure top 54 is greater than the thickness of the press plate 51. During the pressurized cooling process, the hydraulic top 33 applies pressure downward to the pressure top 54, and the pressure top 54 transfers the pressure to the press plate 51. The pressure top 54 is used to protect the press plate 51 from deformation due to the pressure of the hydraulic top 33. The press plate 51 transfers the pressure to the inner liner 3, and the graphite disk 6 is pressurized through the inner liner 3.

[0039] Directions:

[0040] First, select the corresponding graphite disk 6 according to the product model, and place the skeleton component that has passed the inspection in the placement groove 7 of the graphite disk 6. It should be noted that the positioning column of the skeleton component should be placed in the positioning hole 15 of the placement groove 7; after placement, place the friction body after pressing on the top of the skeleton component, and insert the protrusion 17 of the graphite limit ring 16 into the circular groove 18 of the graphite disk 6 to prevent the product from being subjected to excessive pressure during the sintering process, resulting in unqualified thickness dimensions of the product, and then arrange multiple graphite disks 6 on the truncated table 4 of the water tank 2; in addition, three mounting holes 8 for installing thermocouples are provided on the base, and three thermocouples of different heights can be installed on the base to read the temperature in the inner tank 3. It should be noted that the notch 9 on the graphite disk 6 should be placed in line with the thermocouple to avoid damaging the thermocouple and causing inaccurate temperature measurement.

[0041] Use a crane to place the inner liner 3 above the multiple graphite disks 6. The positioning claws 26 on the inner liner 3 should cooperate with the guide strips 21 on the columns 20. The top of the inner liner 3 presses the graphite limit ring 16 located at the top. The expanded mouth 5 of the inner liner 3 extends below the liquid level of the water tank 2 to ensure the airtight seal in the inner liner 3.

[0042] Use a crane to place the heating cover 12 above the inner tank 3. The first positioning block 22 on the heating cover 12 should cooperate with the guide strip 21 on the column 20. Place the inner tank pressing device 36 in the circular hole 45 of the heating cover cover 35 to press the inner tank 3. A hydrogen-nitrogen mixed gas is introduced into the inner tank 3 to ensure that the metal material inside the friction body assembly will not produce an oxidation-reduction reaction during the pressurized sintering process. An air inlet 10 and an air outlet 11 are provided on the base 1. The air inlet 10 and the air outlet 11 are respectively connected to the air inlet pipe and the air outlet pipe. The inner liner 3 is inflated with air, and the outlet pipe is ignited to determine whether the concentration of the mixed gas is qualified. After the gas concentration is qualified, the inlet pipe and the outlet pipe are closed; after the ventilation is completed, the pressurizing component 14 is used to pressurize the heating cover 12, and the hydraulic top 33 applies pressure downward to the inner liner pressing device 36, and the inner liner pressing device 36 transmits the pressure to the inner liner 3, and the graphite disk 6 is pressurized through the inner liner 3. The pressure needs to be adjusted accordingly according to different product models and required physical properties; after the pressurization is completed, the heating resistance wire is energized, and the product is sintered through the heating cover 12.

[0043] After the pressure sintering is completed, the heating hood 12 is moved away by a crane, and the cooling hood 13 is placed above the inner liner 3. The second positioning block 24 on the cooling hood 13 should cooperate with the guide strip 21 on the column 20; the pressing plate 51 on the cooling hood 13 presses the inner liner 3; the pressing top 54 is placed on the pressing plate 51, and the cooling hood 13 is pressurized by the pressurizing component 14. The hydraulic top 33 applies pressure downward to the pressing top 54, and the pressing top 54 transfers the pressure to the pressing plate 51. The pressing top 54 is used to protect the pressing plate 51 from being deformed by the pressure of the hydraulic top 33. The pressing plate 51 transfers the pressure to the inner liner 3, and the graphite disk 6 is pressurized through the inner liner 3; after the pressurization is completed, the cooling water circulation system connected to the water tank 2 is turned on, and the air cooler connected to the cooling hood 13 is turned on to pressurize and cool the product.

[0044] After cooling is completed, the cooling cover 13 and the inner container 3 are removed in sequence, and the pressure sintering operation is completed.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Pressurized sintering furnace for powder metallurgy brake pad friction body assembly, characterized by: The utility model comprises a base, wherein a circular water tank is provided on the base, an inner liner with an opening at the lower end is provided above the water tank, the inner liner is in a cylindrical state, a truncated cone is coaxially fixedly installed in the water tank, a flared opening matching the truncated cone is provided at the lower end of the inner liner, a plurality of graphite disks for placing friction body assemblies are arranged between the truncated cone and the top of the inner liner, and a plurality of placement grooves for placing friction body assemblies are provided on the top of the graphite disk; a heating cover and a cooling cover for pressing the inner liner are detachably installed on the base, and a pressurizing assembly for pressurizing the heating cover or the cooling cover is also provided on the base; The bottom of the placement groove is provided with a positioning hole matching the positioning column of the skeleton assembly; the graphite disk is also provided with a graphite limiting ring, the lower end of the graphite limiting ring is coaxially provided with an annular protrusion, and the graphite disk is provided with a circular groove matching the protrusion; A plurality of support blocks matching the heating cover or the cooling cover are fixedly installed on the inner wall of the water tank at uniform intervals in the circumferential direction; two columns are fixedly installed on the base, and the two columns are relatively arranged on the left and right sides of the water tank, and the inner sides of the two columns are respectively fixedly installed with vertically extending guide strips; two first positioning blocks are relatively fixedly installed on the left and right sides of the heating cover, and the first positioning block is provided with a first positioning groove matching the guide strip; two second positioning blocks are relatively fixedly installed on the left and right sides of the cooling cover, and the second positioning block is provided with a second positioning groove matching the guide strip; two positioning claws extending to the outside of the water tank are relatively fixedly installed on the left and right sides of the expanded mouth of the inner tank, and the positioning claws are provided with a third positioning groove matching the guide strip; the pressurizing assembly is arranged between the tops of the two columns; The heating hood comprises a cylindrical heating hood body, two first positioning blocks are fixedly mounted on the left and right sides of the heating hood body, a heating hood cover plate is fixedly mounted on the upper end of the heating hood body, an inner liner pressing device is arranged on the heating hood cover plate, an annular support plate is coaxially fixedly mounted on the inner side of the lower end of the heating hood body, a plurality of annular refractory brick layers are arranged on the support plate, the refractory brick layer is coaxially arranged with the heating hood body and the inner diameter of the refractory brick layer matches the upper end of the inner liner, a placement groove for placing a heating resistance wire is arranged on the refractory brick layer, and a fireproof material is filled between the outer side of the refractory brick layer and the heating hood body; A circular hole is coaxially arranged on the heating cover plate, and the inner liner pressing device located between the pressurizing assembly and the inner liner is arranged in the circular hole, and the inner liner pressing device comprises an insulating barrel with an upper end opening, and the insulating barrel is filled with insulating material, and an insulating barrel cover plate is fixedly installed on the top of the insulating barrel, and a cold water tank is also fixedly installed below the insulating barrel cover plate, and a water inlet pipe and a water outlet pipe having one end connected to the cold water tank are fixedly installed on the insulating barrel cover plate; The cooling hood includes a cylindrical cooling hood body, two second positioning blocks are fixedly installed on the left and right sides of the cooling hood body, a pressure plate for pressing the inner tank is fixedly installed on the upper end of the cooling hood body, an air inlet pipe is fixedly installed on the outer peripheral surface of the cooling hood body, and a plurality of air outlet holes are provided on the pressure plate.

2. The pressure sintering furnace for the powder metallurgy brake pad friction body assembly according to claim 1, characterized in that: The pressurizing assembly includes a mounting seat located between the upper ends of the two columns, wherein a vertically extending rotating shaft is fixedly mounted on the upper end of one of the columns, a rotating sleeve matching the rotating shaft is provided at one end of the mounting seat, and a positioning seat is fixedly mounted on the upper end of the other column, a positioning groove matching the end of the mounting seat away from the rotating sleeve is provided on the positioning seat; a downwardly extending hydraulic jack is fixedly mounted in the middle position of the mounting seat.

3. The pressure sintering furnace for the powder metallurgy brake pad friction body assembly according to claim 1, characterized in that: The front side of the heating cover cylinder is provided with a plurality of through holes for the wires of the heating resistance wire to pass through, and a protective plate is fixedly installed at the outer side of the heating cover cylinder corresponding to the positions of the plurality of through holes, and sleeves are fixedly installed at the positions of the protective plate corresponding to the positions of the plurality of through holes.

4. The pressure sintering furnace for the powder metallurgy brake pad friction body assembly according to claim 1, characterized in that: A pressure top for bearing the pressure of the pressurizing component is also provided above the press plate, and the thickness of the pressure top is greater than the thickness of the press plate.

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