High-temperature vacuum metal powder degreasing and sintering equipment

Abstract

The utility model relates to the field of metal material processing, in particular to high-temperature vacuum metal powder degreasing and sintering equipment which comprises an equipment furnace, a processing cavity and an electrical cavity are sequentially formed in the equipment furnace from top to bottom, and the high-temperature vacuum metal powder degreasing and sintering equipment further comprises a material placing table arranged in the processing cavity. The chance that products are subjected to external force such as collision and vibration in the moving process is reduced, the fragmentation damage risk of preliminarily-formed products is greatly reduced, unnecessary losses are avoided, degreasing and sintering are completed in the same device, the production process is simplified, operators do not need to frequently transfer materials among different devices, and the production efficiency is improved. Compared with the prior art, operation complexity and labor intensity are reduced, convenience of production operation is improved, two procedures are integrated in one device, and compared with two independent devices, the whole structure of the device is more compact, occupied space is smaller, and reasonable arrangement of the device in a limited production site is facilitated for enterprises.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high temperature vacuum metal powder degreasing sintering equipment especially relates to a high temperature vacuum metal powder degreasing sintering equipment applied to metal material processing field. BACKGROUND

[0002] Degreasing and sintering are the most critical steps of metal forming process, degreasing is the process of removing the binder contained in the forming blank before sintering, the degreasing process must ensure that the binder is gradually discharged from different parts of the blank along the small channels between the particles without damaging the high strength of the forming blank, sintering can make the porous degreasing blank shrink and densify into a product with certain organization and performance, with the development of manufacturing industry, the quality and performance requirements of metal parts are continuously improved, and the performance of the degreasing and sintering equipment also becomes a key factor affecting product quality.

[0003] The traditional metal powder degreasing and sintering process usually carries out the two key links of degreasing and sintering in two independent equipment furnaces respectively, in the process of transferring the parts from the degreasing furnace to the sintering furnace, the initially formed product structure is relatively fragile, and is easily affected by external forces such as vibration and collision, thereby appearing the phenomenon of fragmentation, leading to product damage, causing waste of raw materials, energy and processing time, increasing production cost, and using two independent equipment not only increases the equipment floor area, increases the site cost of enterprises, but also the operation process is complicated, the operating personnel need to frequently transfer materials between different equipment, the labor intensity is large, the production efficiency is low, at the same time, the maintenance and debugging work of the two equipment are relatively complex, further increasing the operation cost of enterprises, in view of this, the utility model is proposed. UTILITY MODEL CONTENTS

[0004] In view of the above prior art, the technical problem to be solved by the utility model is how to reduce the phenomenon of fragmentation damage of the initially formed product.

[0005] In order to solve the above problems, the utility model provides a high temperature vacuum metal powder degreasing sintering equipment, which comprises an equipment furnace, a processing cavity and an electrical cavity are sequentially arranged in the equipment furnace from top to bottom, and further comprises: a material placing table arranged in the processing cavity; a controller fixedly installed on the equipment furnace and located between the processing cavity and the electrical cavity; an exhaust pipe fixedly arranged at the upper end of the equipment furnace and connected with the processing cavity; a vacuum gauge installed at the detection port of the exhaust pipe; a separation assembly for separating organic substances in gas, installed on one side of the equipment furnace; a first vacuum pumping pipe with two ends respectively connected with the gas outlet of the exhaust pipe and the gas inlet of the separation assembly; a vacuum pump fixedly installed in the electrical cavity; a second vacuum pumping pipe with two ends respectively connected with the gas outlet of the separation assembly and the gas inlet of the vacuum pump; a thermocouple arranged in the processing cavity; the vacuum pump and the thermocouple are electrically connected with the controller.

[0006] In the high-temperature vacuum metal powder debinding and sintering device, by integrating the debinding and sintering operations in one device furnace, the opportunities of the product being subjected to external forces such as collision and vibration during movement are reduced, the risk of breakage of the preliminary formed product is greatly reduced, and unnecessary loss is avoided.

[0007] As a further improvement of the present application, the separation assembly is a cold trap fixedly installed on one side of the device furnace, the gas inlet and the gas outlet of the cold trap are arranged above, the bottom of the cold trap is provided with a liquid discharge port, and the liquid discharge port of the cold trap is connected with a first ball valve.

[0008] As a further improvement of the present application, a molecular pump is installed in the electrical cavity, the gas inlet of the molecular pump is connected with the gas outlet of the second vacuum pipe, and the gas outlet of the molecular pump is connected with the gas inlet of the vacuum pump.

[0009] As a further improvement of the present application, one side of the device furnace is fixedly connected with an inert gas storage tank through a support plate, a gas jet head with a solenoid valve is installed in the processing cavity, and the gas jet head and the inert gas storage tank are connected through a connecting gas pipe.

[0010] As a further improvement of the present application, a plurality of placement grooves are equidistantly arranged on the material placement table, and a plurality of air vents are equidistantly arranged on the bottom of the placement groove.

[0011] As a further improvement of the present application, a rotating shaft is rotatably connected in the processing cavity, the material placement table is fixedly connected to the upper end of the rotating shaft, a plurality of blades are fixedly connected to the rotating shaft in a circumferential direction, and the gas jet port of the gas jet head faces the blades.

[0012] As a further improvement of the present application, the gas outlet of the vacuum pump is fixedly connected with a three-way gas pipe, the two gas outlets of the three-way gas pipe are connected with second ball valves, and one of the gas outlets of the three-way gas pipe is connected with the gas return port of the inert gas storage tank.

[0013] As a further improvement of the present application, self-locking universal wheels are installed at the four corners of the bottom of the device furnace.

[0014] Compared with the prior art of using two equipment furnaces to separately perform the degreasing and sintering of the material, the high-temperature vacuum metal powder degreasing and sintering equipment integrates the degreasing and sintering operations in one equipment furnace, reduces the opportunities of the product to be subjected to external forces such as collision and vibration during movement, greatly reduces the risk of breakage of the preliminary shaped product, avoids unnecessary loss, completes the degreasing and sintering in the same equipment, simplifies the production process, and reduces the operation complexity and labor intensity of the operator who does not need to frequently transfer the material between different equipment, thereby improving the convenience of production operation. Integrating the two processes in one equipment, compared with using two independent equipment, the overall structure of the equipment is more compact, occupies less space, and is conducive to the enterprise to reasonably arrange the equipment in the limited production site and improve the site utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of an embodiment of the present application;

[0016] Figure 2 is a structural schematic diagram of part of the structure in an embodiment of the present application Figure 1 ;

[0017] Figure 3 is a structural schematic diagram of part of the structure in an embodiment of the present application Figure 2 .

[0018] BRIEF DESCRIPTION OF DRAWINGS

[0019] 1, equipment furnace; 101, processing cavity; 102, electrical cavity; 103, controller; 104, vacuum pump; 105, molecular pump; 106, thermocouple; 107, exhaust pipe; 108, vacuum gauge; 109, first vacuumizing pipe; 1010, cold trap; 1011, first ball valve; 1012, second vacuumizing pipe; 1013, self-locking universal wheel; 2, rotating shaft; 201, material placing table; 202, placing groove; 203, blade; 204, inert gas storage tank; 205, air injection head; 206, three-way air pipe; 207, second ball valve. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0021] Embodiment:

[0022] Figures 1-3As shown, a high-temperature vacuum metal powder debinding sintering device comprises a device furnace 1, a processing cavity 101 and an electrical cavity 102 are sequentially arranged in the device furnace 1 from top to bottom, further comprising: a material placing table 201 arranged in the processing cavity 101; a controller 103 fixedly installed on the device furnace 1 and located between the processing cavity 101 and the electrical cavity 102; an exhaust pipe 107 fixedly arranged at the upper end of the device furnace 1 and connected with the processing cavity 101; a vacuum gauge 108 installed at the detection port of the exhaust pipe 107; a separation assembly for separating organic substances in gas, installed on one side of the device furnace 1; a first vacuum pipe 109 with two ends connected with the gas outlet of the exhaust pipe 107 and the gas inlet of the separation assembly respectively; a vacuum pump 104 fixedly installed in the electrical cavity 102; a second vacuum pipe 1012 with two ends connected with the gas outlet of the separation assembly and the gas inlet of the vacuum pump 104 respectively; a thermocouple 106 arranged in the processing cavity 101; the vacuum pump 104 and the thermocouple 106 are electrically connected with the controller 103.

[0023] The separation assembly is a cold trap 1010 fixedly installed on one side of the device furnace 1, the gas inlets and outlets of the cold trap 1010 are arranged above, the bottom of the cold trap 1010 is provided with a liquid discharge port, and the liquid discharge port of the cold trap 1010 is connected with a first ball valve 1011.

[0024] When the debinding sintering operation of the shaped metal powder is needed, the device is first started, the controller 103 checks the state of each part of the device to ensure that the vacuum pump 104, the thermocouple 106 and the like are normally operated, and the metal powder material to be debound and sintered is prepared and placed on the material placing table 201 in the processing cavity 101, which provides a stable placing position for the material.

[0025] After the material is placed, the furnace door of the processing cavity 101 is closed, the vacuum pump 104 is started, the vacuum pump 104 is connected with the processing cavity 101 through the first vacuum pipe 109 and the exhaust pipe 107, the vacuumization of the processing cavity 101 is started, the vacuum gauge 108 installed at the detection port of the exhaust pipe 107 monitors the vacuum degree in the processing cavity 101 in real time and feeds back the data to the controller 103, and when the vacuum degree reaches the preset requirement (such as 30Pa below required by the process), the gas extraction operation is stopped.

[0026] Then the heating program can be started by the controller 103, and the temperature in the processing cavity 101 is monitored in real time by the thermocouple 106, and heating is carried out according to the set temperature rising curve. First, the temperature is raised from 0°C to 330°C within 30 minutes, and the temperature is maintained for 30 minutes. During the heating process, the ink and other organic substances in the metal powder material will gradually volatilize into gas, and these volatile gases enter the cold trap 1010 through the exhaust pipe 107. The cold trap 1010 uses low temperature to condense the organic substances in the volatile gas into liquid, which is deposited at the bottom of the cold trap 1010. When the liquid in the cold trap 1010 accumulates to a certain extent, the first ball valve 1011 can be opened to discharge the liquid or clean the cold trap 1010, so as to realize the separation and collection of the organic substances and avoid the pollution of the pump body by the organic substances entering the vacuum pump 104.

[0027] After the degreasing process is completed, the temperature can be raised to the sintering temperature of 600°C within 60 minutes, and the temperature is maintained at this temperature for 60 minutes, so that diffusion reaction occurs between the metal powder particles to form a strong bond, and the product is sintered and densified.

[0028] After the degreasing and sintering are completed, the heating is stopped, the processing cavity 101 starts to cool naturally, and after cooling to room temperature, the vacuum pump 104 is closed, and air is introduced into the processing cavity 101 by the controller 103 to restore the pressure in the processing cavity 101 to normal pressure. The door of the processing cavity 101 is opened, and the metal product after degreasing and sintering can be taken out.

[0029] In the traditional metal powder degreasing and sintering process, degreasing and sintering are carried out separately in two equipment furnaces 1, and the product is transferred between the two equipment. Since the structure of the product after preliminary forming is relatively fragile, it is easy to be affected by external force and appear fragmentation phenomenon. The present equipment integrates the degreasing and sintering operations in one equipment furnace 1, reduces the opportunity of the product to be affected by external forces such as collision and vibration during movement, greatly reduces the risk of fragmentation damage of the preliminary formed product, and avoids unnecessary loss.

[0030] The reduction of product damage rate means the saving of raw materials, energy and processing time. Without the need to reprepare raw materials and process due to product fragmentation, the waste of raw materials and additional processing cost are reduced, and the production efficiency is improved, further saving the production cost.

[0031] The degreasing and sintering are completed in the same equipment, which simplifies the production process, and the operator does not need to frequently transfer materials between different equipment, reducing the operation complexity and labor intensity, and improving the convenience of production operation.

[0032] The two processes are integrated in one device, compared with using two independent devices, the overall structure of the device is more compact, occupies less space, and is beneficial to the enterprise to reasonably layout the equipment in the limited production site and improve the site utilization rate.

[0033] Figure 1 It is shown that a molecular pump 105 is installed in the electrical cavity 102, the gas inlet of the molecular pump 105 is connected with the gas outlet of the second vacuum pumping pipe 1012, and the gas outlet of the molecular pump 105 is connected with the gas inlet of the vacuum pump 104.

[0034] Because the molecular pump 105 has the characteristics of high pumping speed and low limit pressure, when the processing cavity 101 is pumped, the vacuum pump 104 is used for preliminary pumping to reduce the pressure in the cavity, and then the molecular pump 105 is started. It can quickly pump out gas molecules from the gas inlet and discharge them into the vacuum pump 104 for further processing, accelerate the discharge of gas in the cavity, significantly improve the pumping efficiency, so that the processing cavity 101 can reach a higher vacuum degree in a shorter time, and meet the strict requirements of metal powder degreasing and sintering on the vacuum environment.

[0035] Figures 1-3 It is shown that the inert gas storage tank 204 is fixedly connected to one side of the device furnace 1 through a support plate, the gas jet head 205 with a solenoid valve is installed in the processing cavity 101, and the gas jet head 205 and the inert gas storage tank 204 are connected through a connecting gas pipe. During work, inert gas can be introduced into the processing cavity 101 to discharge air and form a protective atmosphere, effectively avoiding oxidation of metal powder during the degreasing and sintering process, ensuring the chemical composition and performance stability of the product, improving the product quality. The gas jet head 205 is equipped with a solenoid valve, which can accurately control the amount and time of inert gas introduction. In different stages of degreasing and sintering, the atmosphere can be flexibly adjusted according to the process requirements. In the early stage of sintering, appropriate inert gas is introduced to reduce the oxygen content and reduce the risk of oxidation. During the sintering process, the inert gas flow is accurately controlled according to the temperature change and reaction progress to maintain a stable reaction environment, promote the diffusion reaction of metal powder particles, improve the sintering effect, optimize the degreasing and sintering process, and improve the product performance.

[0036] The material placing table 201 is provided with a plurality of placing grooves 202 equidistantly opened, and a plurality of air holes are equidistantly opened at the bottom of the placing grooves 202. The plurality of equidistant placing grooves 202 on the material placing table 201 can orderly arrange the materials, fully utilize the limited space, increase the number of materials processed at a time, reduce the processing batches, improve the production efficiency, the air holes at the bottom of the placing grooves 202 can make the gas in the processing cavity 101 better contact with the materials, and when vacuumizing, the gas can more smoothly enter the placing grooves 202 through the air holes, rapidly take away the organic substances volatilized from the materials, avoid the accumulation of the organic substances around the materials, ensure the degreasing effect, prevent the residual organic substances from affecting the product quality, and the air holes are helpful to the uniform heat transfer in the processing cavity 101, avoid the influence of the local temperature that is too high or too low on the sintering quality of the materials, the hot air flow can enter the placing grooves 202 through the air holes, make the materials uniformly heated, promote the diffusion reaction between the metal powder particles, form a more uniform and dense metal structure, and improve the strength and performance of the product.

[0037] The rotating shaft 2 is rotationally connected in the processing cavity 101, the material placing table 201 is fixedly connected to the upper end of the rotating shaft 2, a plurality of blades 203 are fixedly connected to the rotating shaft 2 in a circumferential equidistant manner, the air jet head 205 faces the blades 203, and the air jet head 205 sprays air to the blades 203. Since the blades 203 are circumferentially and equidistantly distributed on the rotating shaft 2, the airflow impact force generated when the air is sprayed can drive the rotating shaft 2 and the material placing table 201 thereon to rotate. This makes the inert gas introduced into the processing cavity 101 more uniformly diffuse in the cavity, avoids the occurrence of airflow dead angles, and provides a stable and consistent atmosphere environment for the metal powder degreasing and sintering, so as to ensure that the materials at different positions can fully contact with the inert gas and effectively prevent oxidation, and optimize the process environment of the degreasing and sintering. This dynamic process increases the contact area and frequency of the materials and the gas in the cavity, which is helpful to accelerate the volatilization and discharge of the organic substances in the materials. Meanwhile, the blades 203 can disturb the surrounding gas during the rotation process, enhance the flow effect of the gas, and make the gas containing the organic substances more quickly discharged through the air holes and the exhaust pipe 107, further strengthen the degreasing effect, reduce the residual organic substances, and improve the product quality. The rotation of the material placing table 201 makes the materials continuously change positions in the processing cavity 101, avoids the influence of the uneven heating of the materials due to the fixed position on the sintering quality, and makes the materials more uniformly absorb heat during the rotation process, promotes the diffusion reaction between the metal powder particles, makes the structure of the sintered product more uniform and dense, and improves the strength and performance consistency of the product.

[0038] Figure 1It is shown that the gas outlet of the vacuum pump 104 is fixedly connected with a three-way air pipe 206, two gas outlets of the three-way air pipe 206 are connected with second ball valves 207 respectively, one of the gas outlets of the three-way air pipe 206 is connected with the gas return port of the inert gas storage tank 204, the three-way air pipe 206 connects the gas outlet of the vacuum pump 104 with the gas return port of the inert gas storage tank 204, and the second ball valves 207 can be used to reasonably distribute the mixed gas containing inert gas extracted, when it is judged that the inert gas content in the gas is high and meets the reuse standard, the corresponding second ball valve 207 is opened, and the gas is recycled to the inert gas storage tank 204. This design realizes the recycling of inert gas, reduces the demand for new inert gas supplement, reduces the production cost, and the three-way air pipe 206 and the second ball valve 207 can be used to flexibly control the discharge and recovery of the gas according to the specific process steps of the degreasing and sintering. In the degreasing stage, a large amount of organic waste gas is generated by volatilization of the material, at this time, the second ball valve 207 connected with the inert gas storage tank 204 can be closed, and the waste gas can be directly discharged to avoid polluting the gas in the inert gas storage tank 204. In the sintering stage, if the inert gas content in the gas is high, the corresponding ball valve can be opened for recycling. This flexible control mode optimizes the entire degreasing and sintering process, improves the production efficiency and product quality.

[0039] Figure 1 It is shown that the four corners of the bottom of the equipment furnace 1 are provided with self-locking universal wheels 1013, the installation of the self-locking universal wheels 1013 enables the equipment to be easily moved, and the operator can flexibly change the position of the equipment in the workshop as needed, conveniently connect with upstream and downstream equipment, and improve the continuity of the production process. For example, when the production line is upgraded and modified, the degreasing and sintering equipment can be quickly moved to the designated position, reducing the difficulty of layout adjustment caused by fixed equipment, saving time and labor cost.

[0040] The above-mentioned embodiments of the present application are not limited to the actual needs, and various changes made by those skilled in the art within the scope of their knowledge do not deviate from the concept of the present application and still fall within the protection scope of the present application.

Claims

1. A high-temperature vacuum metal powder debinding sintering apparatus, characterized by, Including equipment furnace (1), the equipment furnace (1) is sequentially opened with processing cavity (101), electrical cavity (102) from top to bottom, further comprising: Material placing table (201) is arranged in the processing cavity (101); Controller (103) is fixedly installed on the equipment furnace (1), and is located between the processing cavity (101) and the electrical cavity (102); Exhaust pipe (107) is fixedly arranged at the upper end of the equipment furnace (1), and is communicated with the processing cavity (101); Vacuum gauge (108) is installed at the detection port of the exhaust pipe (107); The separation assembly for separating organic substances in gas is installed on one side of the equipment furnace (1); First vacuum pipe (109) is communicated with the gas outlet of the exhaust pipe (107) and the gas inlet of the separation assembly respectively; Vacuum pump (104) is fixedly installed in the electrical cavity (102); Second vacuum pipe (1012) is communicated with the gas outlet of the separation assembly and the gas inlet of the vacuum pump (104) respectively; Thermocouple (106) is arranged in the processing cavity (101); The vacuum pump (104), thermocouple (106) are electrically connected with the controller (103).

2. A high temperature vacuum metal powder debinding and sintering apparatus according to claim 1, wherein The separation assembly is a cold trap (1010), the cold trap (1010) is fixedly installed on one side of the equipment furnace (1), the gas inlet and the gas outlet of the cold trap (1010) are arranged above, the bottom of the cold trap (1010) is provided with a liquid discharge port, and the liquid discharge port of the cold trap (1010) is communicated with a first ball valve (1011).

3. A high temperature vacuum metal powder debinding and sintering apparatus as claimed in claim 2, characterized in that The molecular pump (105) is installed in the electrical cavity (102), the gas inlet of the molecular pump (105) is communicated with the gas outlet of the second vacuum pipe (1012), and the gas outlet of the molecular pump (105) is communicated with the gas inlet of the vacuum pump (104).

4. The high temperature vacuum metal powder debinding and sintering apparatus of claim 1, wherein, One side of the equipment furnace (1) is fixedly connected with an inert gas storage tank (204) through a support plate, a gas jet head (205) with a solenoid valve is installed in the processing cavity (101), and the gas jet head (205) and the inert gas storage tank (204) are communicated through a connecting gas pipe.

5. A high temperature vacuum metal powder debinding and sintering apparatus as claimed in claim 4, characterized in that A plurality of placing grooves (202) are equidistantly arranged on the material placing table (201), and a plurality of air holes are equidistantly arranged on the bottom of the placing groove (202).

6. A high temperature vacuum metal powder debinding and sintering apparatus as claimed in claim 1, wherein, A rotating shaft (2) is rotatably connected in the processing cavity (101), the material placing table (201) is fixedly connected to the upper end of the rotating shaft (2), a plurality of blades (203) are fixedly connected to the rotating shaft (2) in a circumferential direction, and the gas jet port of the gas jet head (205) faces the blades (203).

7. A high temperature vacuum metal powder debinding and sintering apparatus as claimed in claim 4, wherein The gas outlet of the vacuum pump (104) is fixedly communicated with a three-way gas pipe (206), the two gas outlets of the three-way gas pipe (206) are communicated with second ball valves (207), and one of the gas outlets of the three-way gas pipe (206) is communicated with the gas return port of the inert gas storage tank (204).

8. A high temperature vacuum metal powder debinding and sintering apparatus as claimed in claim 1, wherein, Self-locking universal wheels (1013) are installed at the four corners of the bottom of the equipment furnace (1).

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