A sintering device for powder metallurgy gear ring

Abstract

The present application relates to the technical fields of metal sintering, in particular to a sintering device for powder metallurgy gear ring. The conveying frame is provided with a conveying belt for conveying the powder compacted gear ring. The conveying frame is provided with a processing box. The processing box is sequentially provided with a stearic acid area, a heating area, a dewaxing area, a sintering area, a rapid cooling area and a gas quenching area. The conveying belt conveys the gear ring through the processing box. The stearic acid area is used for adding stearic acid to the gear ring. The heating area is provided with heating elements for preliminarily heating the gear ring. The dewaxing area is provided with heating elements for heating and burning dewaxing. The sintering area is provided with heating elements for sintering the gear ring. The rapid cooling area is used for introducing cooling gas to cool the gear ring. The gas quenching area is used for introducing quenching gas. The temperature in the heating area is lower than that in the sintering area. The heating area and the sintering area are both provided with circulating fans and gas distributors. The circulating fans are used for blowing air towards the corresponding gas distributors. The temperature uniformity is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal sintering, and particularly relates to a sintering device for powder metallurgy gear ring. BACKGROUND

[0002] Sintering refers to the transformation of powdery materials into dense bodies, and is a traditional process. People have used this process to produce ceramics, powder metallurgy, refractory materials, ultra-high temperature materials and the like for a long time. After the powder is formed, the dense body obtained through sintering is a polycrystalline material, and the microstructure thereof is composed of crystals, glass bodies and pores.

[0003] Powder metallurgy technology is widely used in the manufacture of metal parts with high performance and complex shape. Sintering is a key step of powder metallurgy, and the performance of the equipment directly affects the final quality of the product. At present, although the sintering devices on the market can realize the basic sintering function, the temperature uniformity needs to be improved. SUMMARY

[0004] To solve the problem that the sintering device on the market can realize the basic sintering function, but the temperature uniformity needs to be improved in the prior art, the present application provides a sintering device for metallurgical gear ring, and the specific scheme is as follows.

[0005] A sintering device for powder metallurgy gear ring, comprising a conveying frame, a conveying belt for conveying powder-pressed gear ring is arranged on the conveying frame, the conveying frame is provided with a processing box, the processing box is sequentially provided with a stearic acid area, a heating area, a dewaxing area, a sintering area, a rapid cooling area and a gas quenching area, and the conveying belt conveys the gear ring through the processing box;

[0006] The stearic acid area is used for adding stearic acid to the gear ring, the heating area is provided with a heating element for preliminarily heating the gear ring, the dewaxing area is provided with a heating element for heating and burning dewaxing, the sintering area is provided with a heating element for sintering the gear ring, the rapid cooling area is used for introducing cooling gas to cool the gear ring, and the gas quenching area is used for introducing quenching gas, and the temperature in the heating area is lower than that in the sintering area;

[0007] The heating area and the sintering area are both provided with a circulating fan and a gas distributor, and the circulating fan is used for blowing air towards the corresponding gas distributor.

[0008] By adopting the technical scheme, the machining box is arranged on the conveying frame and is divided into multiple areas, stearic acid can be added to the inner ring in the stearic acid area, the stearic acid can act as a catalyst for sintering, thereby improving the sintering reaction efficiency, further improving the product quality, and then after preheating and dewaxing, the wax on the inner ring can be removed and the inner ring has a certain temperature, which is convenient for subsequent heating, and then the inner ring enters the sintering area to complete the final sintering, and after sintering, the product is cooled in the rapid cooling area, which is convenient for the product to be transported out, and the safety during discharging is improved, and the circulating fan and the gas distributor are arranged in the heating area and the sintering area, which can make the air in the heating area and the sintering area more circulating, improve the uniformity of the atmosphere, and make the inner ring uniformly heated, thereby improving the sintering quality.

[0009] Optionally, a plurality of temperature sensors are arranged in the machining box, and the temperature sensors are used to detect the temperature at different positions of the heating box and adjust the heating element.

[0010] By adopting the technical scheme, the temperature in the machining box can be adjusted according to the required temperature by arranging multiple temperature sensors in the machining box to detect the temperature in real time, thereby reducing the situation that the temperature does not meet the requirements and affects the sintering quality, and further improving the product quality.

[0011] Optionally, the rapid cooling area is provided with a gas jet head, and the machining box is also provided with an air inlet pipe at a position corresponding to the rapid cooling area, the air inlet pipe is connected with the gas jet head, and the air inlet pipe is connected with a nitrogen purging pipe, a propyl alcohol pipe and an ammonia decomposition pipe.

[0012] By adopting the technical scheme, the gas jet head is arranged in the rapid cooling area, and the ammonia gas and the propyl alcohol in the decomposition can rapidly cool the inner ring, and the nitrogen can be used to purge the inner ring, thereby realizing rapid cooling and preliminarily performing gas quenching, and improving the safety during discharging and carrying.

[0013] Optionally, the gas quenching area is also provided with the same gas jet head, and the machining box is provided with a nitrogen pipe corresponding to the gas quenching area, and the nitrogen pipe is in communication with the corresponding gas jet head.

[0014] By adopting the technical scheme, the gas jet head is arranged in the gas quenching area, the gas jet head can introduce nitrogen to perform gas quenching treatment on the product, the inert gas further cools the product, removes impurities in the air, and reduces the possibility of oxidation and decarburization.

[0015] Optionally, a jet head frame is arranged in the machining box corresponding to the gas jet head, the jet head frame includes multiple jet head rods, the jet head rods are arranged in parallel along the vertical direction, and the gas jet head is mounted on the jet head rods and is independently controlled.

[0016] By adopting the above technical scheme, the gas nozzle is arranged in multiple layers in the processing box through the nozzle holder, multiple independent control nozzles can be arranged, uniform and controllable gas action on the gear ring during rapid cooling and gas quenching is ensured, and the cooling efficiency and quenching effect are improved.

[0017] Optionally, the gas nozzle comprises an ultrasonic atomizing nozzle.

[0018] By adopting the above technical scheme, the ultrasonic atomizing nozzle can realize finer droplet distribution during gas quenching, further improving the quenching quality.

[0019] Optionally, the heating element comprises an infrared radiation heater.

[0020] By adopting the above technical scheme, the infrared radiation heater can further improve the heating efficiency and energy saving.

[0021] Optionally, the conveying belt comprises a mesh belt, an outer conveying roller and an inner conveying roller, the mesh belt is connected to the outer conveying roller and the inner conveying roller and moves along the outer conveying roller and the inner conveying roller, the outer conveying roller is arranged on the lower side of the processing box, the outer conveying roller is rotationally connected to the conveying frame, the inner conveying roller is arranged in the inner part of the processing box, the inner conveying roller is rotationally connected to the processing box, the bottom of the conveying frame is provided with a cleaning bucket, the cleaning bucket is arranged along the length direction of the conveying frame, a plurality of shower pipes are arranged in the cleaning bucket, and the shower pipes are used for spraying cooling liquid towards the mesh belt.

[0022] By adopting the above technical scheme, the mesh belt is used to convey the gear ring, the mesh belt is more ventilated, the gear ring can be heated more uniformly, and after the mesh belt is heated, it can be conveyed to the outside, at this time, the mesh belt can be washed by the shower pipes to wash the wax on the mesh belt, reducing the influence of the wax on the product in the subsequent sintering process, and when the whole processing is completed, the washing intensity of the shower pipes can be increased to cool the processing box and the conveying belt, reducing the service life of the processing box and the conveying belt under the condition of long-term high temperature.

[0023] Optionally, a positioning rod is further arranged, the positioning rod is detachably connected to the mesh belt, the conveying frame is provided with a mounting frame at the end of the processing box, a positioning plate is fixedly arranged on the mounting frame, the positioning plate is arranged on the lower side of the mesh belt and on the upper side of the cleaning bucket, a positioning groove is arranged on the positioning plate and corresponds to the position of the positioning rod, the positioning rod can slide along the positioning groove, and a sensing cylinder is further arranged on the lower side of the positioning plate and corresponds to the shape of the positioning rod, a temperature sensing assembly is arranged in the sensing cylinder, the temperature sensing assembly is electrically connected to the shower pipes and starts the shower pipes when receiving a temperature rising signal.

[0024] By adopting the technical scheme, the positioning rod detachably connected with the mesh belt can move along with the mesh belt, and is placed in front of the first batch of sintered gear rings, and then the position of the mesh belt can be determined according to the positioning rod; when the first batch of sintered gear rings are transported out, the positioning rod is just blocked by the positioning plate and moves towards the induction cylinder under the double actions of gravity and interference, so that the mesh belt can be cleaned by the spray pipe, and the waste of water resources is reduced.

[0025] Optionally, the mounting frame is further provided with a push cylinder, the push cylinder is electrically connected with the temperature sensing assembly, a blocking plate is fixedly arranged on a piston rod of the push cylinder, and the push cylinder can drive the blocking plate to move upwards to block the product.

[0026] By adopting the technical scheme, when the temperature sensing assembly detects that the temperature has not decreased to the deliverable temperature, the push cylinder is used to push the blocking plate upwards to deliver the product to other areas for natural cooling.

[0027] In summary, the present application has at least the following beneficial effects:

[0028] 1. The present application solves the problem that the sintering device in the market can realize basic sintering function, but the temperature uniformity needs to be improved. The present application sets a circulating fan and a gas distributor in the heating area and the sintering area of the processing box, can form a uniform atmosphere in the processing box, makes the temperature distribution in the heating area and the sintering area more uniform, and further improves the uniformity of sintering and the product quality.

[0029] 2. The present application sets the mesh belt to be able to be wound from the outside and cleaned by the spray pipe, which can cool the mesh belt and clean the wax on the mesh belt, is convenient for subsequent sintering, and further improves the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a perspective view of embodiment one.

[0031] Figure 2 is a sectional view of embodiment one.

[0032] Figure 3 is a perspective view of embodiment two.

[0033] Figure 4 is a sectional view of embodiment two.

[0034] REFERENCE SIGNS:

[0035] 1, conveying frame; 11, conveying belt;

[0036] 2, processing box; 21, stearic acid area; 22, heating area; 221, heating fan; 222, gas distributor; 223, infrared radiation heater; 23, dewaxing area; 24, sintering area; 25, rapid cooling area; 251, gas nozzle; 252, nozzle holder; 253, nozzle rod; 254, ultrasonic atomizing nozzle; 255, nitrogen purge pipe; 256, propyl alcohol pipe; 257, ammonia decomposition pipe; 26, gas quenching area; 261, nitrogen pipe; 27, temperature sensor;

[0037] 3, mesh belt; 31, outer conveying roller; 32, inner conveying roller;

[0038] 4, cleaning bucket; 41, shower pipe;

[0039] 5, mounting frame; 51, positioning plate; 511, positioning groove; 512, temperature sensing assembly; 52, push cylinder; 521, blocking plate; 53, induction cylinder; 54, positioning rod. DETAILED DESCRIPTION

[0040] The application will be further described in detail below with specific examples in combination with the accompanying drawings.

[0041] Example 1

[0042] A sintering device for powder metallurgy gear ring, as shown in Figure 1 and Figure 2 , comprises a conveying frame 1, a conveying belt 11 for conveying powder-pressed gear rings is arranged on the conveying frame 1, the conveying frame 1 is provided with a processing box 2, the processing box 2 is sequentially provided with a stearic acid area 21, a heating area 22, a dewaxing area 23, a sintering area 24, a rapid cooling area 25, and a gas quenching area 26, and the conveying belt 11 carries the gear rings through the processing box 2. In specific implementation, the processing box 2 needs to be connected with external equipment to keep fixed, the gear rings are conveyed along the conveying frame 1 to complete multiple steps, sintering, and delivery.

[0043] As shown in Figure 1 and Figure 2 , the stearic acid area 21 is used for adding stearic acid to the gear rings, the heating area 22 is provided with heating elements for preliminarily heating the gear rings, the dewaxing area 23 is provided with heating elements for heating and burning dewaxing, the sintering area 24 is provided with heating elements for sintering the gear rings, the rapid cooling area 25 is used for passing cooling gas to cool the gear rings, and the gas quenching area 26 is used for passing quenching gas, and the temperature in the heating area 22 is lower than that in the sintering area 24. In specific implementation, the heating elements include infrared radiation heaters 223, which can improve heating efficiency and energy saving, wherein the temperature of the stearic acid area 21 and the heating area 22 is 680 degrees Celsius, the temperature of the dewaxing area 23 is 1000 degrees Celsius, and the temperature of the sintering area 24 is 1090 degrees Celsius.

[0044] As shown in Figure 1 and Figure 2 , the heating zone 22 and the sintering zone 24 are both provided with circulating fans and gas distributors 222, and the circulating fans are used to blow air towards the corresponding gas distributors 222. In specific implementation, the gas distributor 222 is a device for uniformly distributing the gas flowing into the gas-solid fluidized bed in the whole cross section, and it can form a more uniform atmosphere in the heating zone 22 and the sintering zone 24 in cooperation with the circulating fan, so that the ring gear is heated more uniformly.

[0045] As shown in Figure 1 and Figure 2 , a plurality of temperature sensors 27 are arranged in the processing box 2, and the temperature sensors 27 are used to detect the temperature at different positions of the heating box and adjust the heating element. In specific implementation, the stearic acid zone 21, the heating zone 22, the dewaxing zone 23, the sintering zone 24, the rapid cooling zone 25 and the gas quenching zone 26 are all provided with temperature sensors 27, which can monitor the temperature in the processing box 2 in real time, so as to adjust the temperature in time, thereby reducing the situation that the product quality is affected due to the difference between the temperature and the product demand.

[0046] As shown in Figure 1 and Figure 2 , the rapid cooling zone 25 is provided with a gas jet head 251, and the processing box 2 is also provided with an air inlet pipe corresponding to the position of the rapid cooling zone 25, the air inlet pipe is connected with the gas jet head 251, and the air inlet pipe is connected with a nitrogen purging pipe 255, a propyl alcohol pipe 256 and an ammonia decomposition pipe 257. In specific implementation, the propyl alcohol can directly cool the product, the ammonia can absorb heat through reaction, and the nitrogen as an inert gas can play the role of purging and gas quenching.

[0047] As shown in Figure 1 and Figure 2 , the gas quenching zone 26 is also provided with the same gas jet head 251, and the processing box 2 is provided with a nitrogen pipe 261 corresponding to the gas quenching zone 26, and the nitrogen pipe 261 is in communication with the corresponding gas jet head 251. The processing box 2 is provided with a jet head frame 252 corresponding to the gas jet head 251, and the jet head frame 252 includes a plurality of jet head rods 253 which are arranged in parallel along the vertical direction, and the gas jet head 251 is installed on the jet head rod 253 and is independently controlled. In specific implementation, the gas jet head 251 is arranged in multiple layers, and the gas flow and direction of each layer of nozzle can be independently adjusted to ensure that the ring gear is uniformly and controllably affected by the gas during the rapid cooling and gas quenching process, thereby improving the cooling efficiency and quenching effect. The gas jet head 251 includes an ultrasonic atomizing nozzle 254, and the ultrasonic atomizing nozzle can realize smaller droplet distribution, thereby further improving the quenching quality.

[0048] Working principle: the powder metallurgy steps are the same as the prior art, but the circulating fan and gas distributor 222 are added in the heating zone 22 and sintering zone 24, which can form a uniform atmosphere in the processing box 2, improve the uniformity of the heating of the gear ring, and set multiple spray heads to cool the product, further improve the gas quenching effect and cooling effect.

[0049] Example two

[0050] As shown in Figure 3 and Figure 4 , the main difference between example two and example one is that the conveying belt 11 of example two includes a mesh belt 3, an outer conveying roller 31 and an inner conveying roller 32, the mesh belt 3 is connected to the outer conveying roller 31 and the inner conveying roller 32 and moves along the outer conveying roller 31 and the inner conveying roller 32, the outer conveying roller 31 is arranged on the lower side of the processing box 2, the outer conveying roller 31 is rotationally connected to the conveying frame 1, and the inner conveying roller 32 is arranged inside the processing box 2, the inner conveying roller 32 is rotationally connected to the processing box 2, and the bottom of the conveying frame 1 is provided with a cleaning bucket 4, the cleaning bucket 4 is arranged along the length direction of the conveying frame 1, a plurality of shower pipes 41 are arranged in the cleaning bucket 4, the shower pipes 41 are equidistantly arranged along the length direction of the cleaning bucket 4, and the shower pipes 41 are used to spray cooling liquid towards the mesh belt 3. In specific implementation, when the mesh belt 3 is heated in the processing box 2, the wax separated by heating will adhere to the mesh belt 3, so when the mesh belt 3 is sent out, the mesh belt 3 is washed in time by the cooling liquid, which can not only clean the adhered wax, but also further play a cooling role. Since the mesh belt 3 has been rapidly cooled when it is sent out, it is not easy to cause damage due to too large temperature difference.

[0051] As shown in Figure 3 and Figure 4As shown, the positioning rod 54 is detachably connected with the mesh belt 3, the conveying frame 1 is provided with a mounting frame 5 at the end of the processing box 2, the mounting frame 5 is fixedly provided with a positioning plate 51, the positioning plate 51 is arranged on the lower side of the mesh belt 3 and on the upper side of the cleaning bucket 4, the positioning plate 51 is provided with a positioning groove 511, the positioning groove 511 is arranged at the position corresponding to the positioning rod 54, the positioning rod 54 can slide along the positioning groove 511, and the lower side of the positioning plate 51 is further provided with a sensing cylinder 53, the sensing cylinder 53 is arranged in a shape corresponding to the positioning rod 54, the sensing cylinder 53 is provided with a temperature sensing assembly 512, the temperature sensing assembly 512 is electrically connected with the flushing pipe 41 and starts the flushing pipe 41 when receiving a temperature rising signal. In specific implementation, the positioning rod 54 is detachably connected with the mesh belt 3 in a clamping manner and can move with the mesh belt 3, needs to be placed in front of the first batch of sintered gear rings, then the position of the mesh belt 3 can be judged according to the positioning rod 54, when the first batch of sintered gear rings is transported out, the positioning rod 54 can be just blocked by the positioning plate 51 and moves towards the sensing cylinder 53 under the double actions of gravity and interference, the temperature sensing assembly 512 in the sensing cylinder 53 detects the temperature and rises, it can be judged that the sensing rod has fallen, at this time, the flushing pipe 41 can be controlled to clean the mesh belt 3.

[0052] As shown in Figure 3 and Figure 4 , the mounting frame 5 is further provided with a push air cylinder 52, the push air cylinder 52 is electrically connected with the temperature sensing assembly 512, the piston rod of the push air cylinder 52 is fixedly provided with a blocking plate 521, the push air cylinder 52 can drive the blocking plate 521 to move vertically upward to block the product. In specific implementation, the push air cylinder 52 can move towards the mesh belt 3 and does not interfere with the mesh belt 3, when moving to the top, the gear ring at the mesh belt 3 can be blocked by the blocking plate 521 and moves towards the two sides, at this time, a temporary table body for natural heat dissipation is arranged on the two sides, the first batch of gear rings transported out can be naturally cooled, at the same time, the internal temperature can be adjusted, which is convenient for subsequent processing.

[0053] Working principle: the basic working principle is the same as that of embodiment one, but the mesh belt 3 can be cleaned and cooled outside the processing box 2 and then sent into the processing box 2 again, and the flushing pipe 41 can be started to cool and clean after judging that the first batch of gear rings is processed.

[0054] The above is the preferred embodiment of the present application, which does not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sintering apparatus for powder metallurgical gear ring, characterized by: Including conveying frame (1), the conveying frame (1) is provided with conveying belt (11) for conveying powder pressing gear ring, the conveying frame (1) is provided with processing box (2), the processing box (2) is sequentially provided with stearic acid area (21), heating area (22), dewaxing area (23), sintering area (24), rapid cooling area (25), gas quenching area (26), the conveying belt (11) carries gear ring from the processing box (2) through; The stearic acid area (21) is used to add stearic acid to the gear ring, the heating area (22) is provided with heating elements for preliminary heating of the gear ring, the dewaxing area (23) is provided with heating elements for heating combustion dewaxing, the sintering area (24) is provided with heating elements for sintering the gear ring, the rapid cooling area (25) is used for cooling the gear ring by passing in cooling gas, and the gas quenching area (26) is used for passing in quenching gas, and the temperature in the heating area (22) is lower than the temperature in the sintering area (24); The heating area (22) and the sintering area (24) are provided with circulating fans and gas distributors (222), and the circulating fans are used to blow air towards the corresponding gas distributors (222); The conveying belt (11) includes a mesh belt (3), an outer conveying roller (31), and an inner conveying roller (32). The mesh belt (3) is connected to the outer conveying roller (31) and the inner conveying roller (32) and moves along the outer conveying roller (31) and the inner conveying roller (32). The outer conveying roller (31) is arranged on the lower side of the processing box (2). The outer conveying roller (31) is rotatably connected to the conveying frame (1). The inner conveying roller (32) is arranged inside the processing box (2). The inner conveying roller (32) is rotatably connected to the processing box (2). The bottom of the conveying frame (1) is provided with a cleaning bucket (4). The cleaning bucket (4) is arranged along the length direction of the conveying frame (1). A plurality of shower pipes (41) are arranged in the cleaning bucket (4). The shower pipes (41) are used to spray cooling liquid towards the mesh belt (3); It also includes a positioning rod (54) which is detachably connected to the mesh belt (3). The conveying frame (1) is provided with a mounting rack (5) at the end of the processing box (2). The mounting rack (5) is fixedly provided with a positioning plate (51). The positioning plate (51) is arranged on the lower side of the mesh belt (3) and on the upper side of the cleaning bucket (4). The positioning plate (51) is provided with a positioning groove (511). The positioning groove (511) is arranged corresponding to the position of the positioning rod (54). The positioning rod (54) can slide along the positioning groove (511). The lower side of the positioning plate (51) is also provided with a temperature sensing cylinder (53). The temperature sensing cylinder (53) is arranged corresponding to the shape of the positioning rod (54). The temperature sensing cylinder (53) is provided with a temperature sensing assembly (512). The temperature sensing assembly (512) is electrically connected to the shower pipe (41) and starts the shower pipe (41) when receiving a temperature rising signal.

2. The sintering device for powder metallurgy gear ring according to claim 1, characterized in that: A plurality of temperature sensors (27) are arranged in the processing box (2) to detect the temperature at different positions of the heating box and adjust the heating elements.

3. The sintering device for powder metallurgy gear ring according to claim 1, characterized in that: The rapid cooling area (25) is provided with a gas nozzle (251), and the processing box (2) is also provided with an air inlet pipe at a position corresponding to the rapid cooling area (25), the air inlet pipe is connected with the gas nozzle (251), and the air inlet pipe is connected with a nitrogen purging pipe (255), a propanol pipe (256) and an ammonia decomposition pipe (257).

4. The sintering device for powder metallurgy gear ring according to claim 3, characterized in that: The gas quenching area (26) is also provided with the same gas nozzle (251), and the processing box (2) is provided with a nitrogen pipe (261) corresponding to the gas quenching area (26), and the nitrogen pipe (261) is communicated with the corresponding gas nozzle (251).

5. The sintering device for powder metallurgy gear ring according to claim 4, characterized in that: The processing box (2) is provided with a nozzle holder (252) corresponding to the gas nozzle (251), the nozzle holder (252) comprises a plurality of nozzle rods (253) arranged in parallel along the vertical direction, and the gas nozzle (251) is mounted on the nozzle rod (253) and is independently controlled.

6. The sintering device for powder metallurgy gear ring according to claim 5, characterized in that: The gas nozzle (251) comprises an ultrasonic atomizing nozzle (254).

7. The sintering device for powder metallurgy gear ring according to claim 1, characterized in that: The heating element comprises an infrared radiation heater (223).

8. The sintering device for powder metallurgy gear ring according to claim 1, characterized in that: The mounting rack (5) is also provided with a push air cylinder (52), the push air cylinder (52) is electrically connected with the temperature sensing assembly (512), a blocking plate (521) is fixedly arranged on a piston rod of the push air cylinder (52), and the push air cylinder (52) can drive the blocking plate (521) to move upwards to block the product.

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