阅读说明：本技术 一种连续式粉末冶金烧结装置及其烧结工艺方法 (Continuous powder metallurgy sintering device and sintering process method thereof ) 是由 赵云红 于 2021-06-28 设计创作，主要内容包括：本发明公开了一种连续式粉末冶金烧结装置及其烧结工艺方法,包括依次对粉末压坯进行预烧的预烧区、对粉末压坯进行高温烧结的烧结区、对粉末压坯进行冷却的冷却区,冷却区分为位于前部的缓冷区和位于后部的急冷区,缓冷区用于对粉末压坯进行缓冷,急冷区用于对粉末压坯进行急速冷却；其中,预烧区、烧结区以及缓冷区共同对应设置同一连续式网带烧结炉,急冷区对应设置气冷式双气体冷却设备；气冷式双气体冷却设备包括从下到上依次连接设置的混气罐、固定导气竖管、旋转接头、活动导气竖管和气冷架,还包括连接架、旋转驱动机构、液氮源和液氦源。本发明大大提高了对圆饼状粉末压坯的加工精度与效率,提高产品质量与产出率,适于规模化推广。(The invention discloses a continuous powder metallurgy sintering device and a sintering process method thereof, comprising a pre-sintering area for pre-sintering powder pressed compacts, a sintering area for sintering the powder pressed compacts at high temperature, and a cooling area for cooling the powder pressed compacts, wherein the cooling area is divided into a slow cooling area positioned at the front part and a rapid cooling area positioned at the rear part, the slow cooling area is used for slowly cooling the powder pressed compacts, and the rapid cooling area is used for rapidly cooling the powder pressed compacts; the system comprises a pre-sintering area, a slow cooling area, a continuous mesh belt sintering furnace, a gas-cooled double-gas cooling device and a gas-cooled double-gas cooling device, wherein the pre-sintering area, the sintering area and the slow cooling area are correspondingly arranged on the same continuous mesh belt sintering furnace; the air-cooled double-gas cooling equipment comprises a gas mixing tank, a fixed gas guide vertical pipe, a rotary joint, a movable gas guide vertical pipe and an air cooling frame which are sequentially connected from bottom to top, and further comprises a connecting frame, a rotary driving mechanism, a liquid nitrogen source and a liquid helium source. The invention greatly improves the processing precision and efficiency of the cake-shaped powder pressed compact, improves the product quality and the yield, and is suitable for large-scale popularization.)

1. A continuous powder metallurgy sintering device and a sintering process method thereof are characterized in that: the powder compact sintering device comprises a pre-sintering area (S1) for sequentially pre-sintering powder compacts, a sintering area (S2) for sintering the powder compacts at high temperature and a cooling area (S3) for cooling the powder compacts, wherein the cooling area (S3) is divided into a slow cooling area (S3.1) at the front part and a quick cooling area (S3.2) at the rear part, the slow cooling area (S3.1) is used for slowly cooling the powder compacts, and the quick cooling area (S3.2) is used for quickly cooling the powder compacts; the pre-sintering zone (S1), the sintering zone (S2) and the slow cooling zone (S3.1) are correspondingly provided with the same continuous mesh belt sintering furnace, and the fast cooling zone (S3.2) is correspondingly provided with air-cooled double-gas cooling equipment;

the air-cooled double-gas cooling equipment comprises a gas mixing tank (3), a fixed gas guide vertical pipe (3c), a rotary joint (4), a movable gas guide vertical pipe (5) and a gas cooling frame (6) which are sequentially connected from bottom to top, and further comprises a connecting frame (8), a rotary driving mechanism (9), a liquid nitrogen source (100) and a liquid helium source (200), wherein:

the gas mixing tank (3) is horizontally arranged, two ends of the gas mixing tank are respectively provided with a nitrogen inlet (3a) and a helium inlet (3b), the nitrogen inlet (3a) is in butt joint with the liquid nitrogen source (100) through a nitrogen pipeline (10), the helium inlet (3b) is in butt joint with the liquid helium source (200) through a helium pipeline (20), and nitrogen and helium are mixed in the gas mixing tank (3) to form nitrogen-helium mixed gas for rapidly cooling the cake-shaped powder compact (300);

the air cooling frame (6) is used for supporting and wrapping the round cake-shaped powder compact (300), and the top of the air cooling frame (6) is of an openable structure; the frame body forming the air cooling frame (6) is of a hollow structure, an air inlet interface (60) which is communicated with the frame body and is butted with the movable air guide vertical pipe (5) is arranged at the center of the bottom of the air cooling frame (6), air injection holes (6102) are uniformly and densely distributed on the inner wall of the air cooling frame (6), and nitrogen and helium mixed gas in the frame body is sprayed to the surface of the round cake-shaped powder pressed compact (300) from the air injection holes (6102) to rapidly cool the round cake-shaped powder pressed compact (300); the inner wall of the air cooling frame (6) is provided with a movable support body (6101), the round cake-shaped powder pressed compact (300) arranged in the air cooling frame (6) is supported by the movable support body (6101) and keeps relative movable arrangement with the air cooling frame (6), and the surface of the round cake-shaped powder pressed compact (300) has a distance with the inner wall of the air cooling frame (6);

the movable air guide vertical pipe (5) is connected to the fixed air guide vertical pipe (3c) through the connecting frame (8), the movable air guide vertical pipe (5) is matched with the connecting frame (8) in a rotating mode, the rotary driving mechanism (9) is connected with the movable air guide vertical pipe (5) in a driving mode, the rotary driving mechanism (9) drives the movable air guide vertical pipe (5) to drive the air cooling frame (6) to rotate rapidly relative to the cake-shaped powder pressed compact (300) so that the relative position of the air injection holes (6102) towards the surface of the cake-shaped powder pressed compact (300) can be adjusted.

2. The continuous powder metallurgy sintering apparatus according to claim 1, wherein: a nitrogen gathering cover (31), a helium gathering cover (32) and a mixed gas impact plate (33) are arranged in the mixed gas tank (3); the gas mixing impact plate (33) is positioned in the middle of the gas mixing tank (3) and is opposite to the fixed gas guide vertical pipe (3c) in the middle of the top of the gas mixing tank (3), and through holes are densely distributed on the surface of the gas mixing impact plate (33); the large port of the nitrogen gathering cover (31) is covered with the nitrogen inlet (3a), and the small port of the nitrogen gathering cover is opposite to the gas mixing impact plate (33); the big port of the helium gathering cover (32) covers the helium inlet (3b), and the small port of the helium gathering cover is opposite to the gas mixing impact plate (33); the nitrogen gathered in the nitrogen gathering cover (31) impacts and disperses on one side of the mixed gas impact plate (33), and the helium gathered in the helium gathering cover (32) impacts and disperses on the other side of the mixed gas impact plate (33), so that the nitrogen and the helium are mixed to form a nitrogen-helium mixed gas.

3. The continuous powder metallurgy sintering apparatus according to claim 2, wherein: a nitrogen release valve (11), a nitrogen power pump (12) and a nitrogen check valve (13) are sequentially arranged on the nitrogen pipeline (10) along the nitrogen conveying direction;

and a helium release valve (21), a helium power pump (22) and a helium check valve (23) are sequentially arranged on the helium pipeline (20) along the helium conveying direction.

4. A continuous powder metallurgy sintering apparatus according to claim 3, wherein: the air cooling frame (6) is provided with an outer bin (7), the air cooling frame (6) is located in the outer bin (7), an air inlet interface (60) of the air cooling frame (6) penetrates through the bottom of the outer bin (7) in a rotating and sealing mode, a bin gate (71) of the outer bin (7) is located at the top, and an air outlet valve (72) is installed on the bin gate (71).

5. The continuous powder metallurgy sintering apparatus according to claim 4, wherein: the air cooling frame (6) comprises two U-shaped frame bodies (61), four overturning driving mechanisms (62), four straight plate frame bodies (63) and four deformable air guide pipes (64); the U-shaped frame body (61) and the straight plate frame body (63) are both hollow structures, and the straight plate frame body (63) is communicated with the U-shaped frame body (61) through a deformable air duct (64); the two U-shaped frame bodies (61) are vertically and crossly connected with each other in an upward opening posture to form a bearing bracket (610) for bearing the cake-shaped powder pressed blank (300), and the air inlet port (60) is positioned in the center of the bottom of the bearing bracket (610); the straight plate frame bodies (63) are correspondingly arranged at the top ends of the supporting brackets (610) one by one through the overturning driving mechanisms (62), the straight plate frame bodies (63) and the corresponding U-shaped frame bodies (61) are positioned on the same vertical plane, and the overturning driving mechanisms (62) drive the straight plate frame bodies (63) to overturn on the vertical plane where the corresponding U-shaped frame bodies (61) are positioned; the air injection holes (6102) are uniformly distributed on the inner wall of the support bracket (610) and the inner wall of the straight plate frame body (63), the movable support body (6101) is movably arranged on the inner wall of the support bracket (610), and the bottom surface and the side surface of the round cake-shaped powder pressed compact (300) have a distance with the inner wall of the support bracket (610) respectively;

when the top of the air cooling rack (6) is in an open state, the straight rack body (63) is turned to an upward vertical state through a turning driving mechanism (62);

the top of the air cooling frame (6) is in a closed state, the straight plate frame body (63) is turned to an inward horizontal state through the turning driving mechanism (62), and a space is reserved between the inner wall of the straight plate frame body (63) and the top surface of the cake-shaped powder pressed blank (300).

6. The continuous powder metallurgy sintering apparatus according to claim 5, wherein: the movable support body (6101) is a ball which is embedded in the groove of the inner wall of the support bracket (610) and can freely roll in the groove.

7. The continuous powder metallurgy sintering apparatus according to claim 5, wherein: upset actuating mechanism (62) include set up in pivot (622) on U type support body (61) top and install servo motor (623) that are used for driving pivot (622) on backup pad (621) through backup pad (621), straight board support body (63) one end is connected on pivot (622).

8. The continuous powder metallurgy sintering apparatus according to claim 7, wherein: the rotary driving mechanism (9) comprises a driving motor (91), a driving gear (92) and a driven outer gear ring (93); the driving motor (91) is installed on the connecting frame (8), the driving gear (92) is installed at the output end of the driving motor (91), the driven outer gear ring (93) is fixedly sleeved on the movable air guide vertical pipe (5), and the driving gear (92) is meshed with the driven outer gear ring (93).

9. The sintering process method of the continuous powder metallurgy sintering device according to claim 8, wherein: comprises a continuous mesh belt sintering furnace operation section and an air-cooled double-gas cooling equipment operation section which are sequentially carried out;

a) the operation section of the continuous mesh belt sintering furnace comprises: specifically comprises a pre-sintering operation section passing through a pre-sintering area (S1), a high-temperature sintering operation section of a sintering area (S2) and a slow cooling operation section of a slow cooling area (S3.1) in sequence

a.1) a pre-burning operation section: adopting nitrogen as protective atmosphere, controlling the heating temperature within the range of 280-700 ℃, improving the strength of the cake-shaped powder compact (300) and removing additives;

a.2) high-temperature sintering operation section: heating indirectly by using a SiC heating element, wherein the heating temperature is controlled within the range of 1125-1140 ℃;

a.3) slow cooling operation section: adopting air to carry out blowing type cooling;

b) air-cooled double-gas cooling equipment operation section

b.1) opening a bin door (71), driving a straight plate frame body (63) to turn outwards by using a turning driving mechanism (62) to open the top of an air cooling frame (6), placing a slowly-cooled round cake-shaped powder compact (300) in a supporting bracket (610), then driving the straight plate frame body (63) to turn inwards by using the turning driving mechanism (62) again to close the top of the air cooling frame (6), closing the bin door (71), and keeping an air outlet valve (72) in an open state;

b.2) opening a nitrogen release valve (11) and a nitrogen check valve (13), starting a nitrogen power pump (12), conveying the nitrogen formed by liquid nitrogen of a liquid nitrogen source (100) to a gas mixing tank (3) through a nitrogen pipeline (10), simultaneously opening a helium release valve (21) and a helium check valve (23), starting a helium power pump (22), conveying the helium formed by liquid helium of a liquid helium source (200) to the gas mixing tank (3) through a helium pipeline (20), and impacting a gas mixing impact plate (33) together by the nitrogen gathered in a nitrogen gathering cover (31) and the helium gathered in a helium gathering cover (32) to disperse and mix to form nitrogen-helium mixed gas;

b.3) the nitrogen-helium mixed gas sequentially passes through the fixed gas guide vertical pipe (3c), the rotary joint (4) and the movable gas guide vertical pipe (5) to be led into the hollow interior of the frame body of the gas cooling frame (6), then the mixed gas is sprayed to the surface of the round cake-shaped powder pressed compact (300) from each gas spraying hole (6102) to rapidly cool the round cake-shaped powder pressed compact (300), and the nitrogen-helium mixed gas forms a rapid cooling atmosphere surrounding the round cake-shaped powder pressed compact (300) in the outer chamber (7), so that the cooling effect is enhanced, and finally the nitrogen-helium mixed gas is discharged from the gas outlet valve (72).

10. The sintering process method of the continuous powder metallurgy sintering device according to claim 9, wherein: in step b.3, indirectly utilize rotary driving mechanism (9) drive movable air guide standpipe (5) to drive air cooling frame (6) and cake form powder pressed compact (300) fast rotation relatively, stop afterwards, because the action of gravity of cake form powder pressed compact (300) self, and the effect that cake form powder pressed compact (300) carried out the activity bearing through movable support body (6101), utilize gravity inertia principle, thereby can adjust the relative position on the surface of fumarole (6102) towards cake form powder pressed compact (300), guarantee to more comprehensive and homogenization to cake form powder pressed compact (300) jet-propelled refrigerated cover.

Technical Field

The invention belongs to the technical field of powder metallurgy sintering, and particularly relates to a continuous powder metallurgy sintering device and a sintering process method thereof.

Background

Continuous type guipure fritting furnace is the equipment commonly used of powder metallurgy sintering, and at back end cooling space, it adopts the water-cooling mode to cool off the powder pressed compact, and cooling efficiency is low on the one hand, and the incrustation scale that on the other hand produced not only can cause the jam to equipment, accumulates on the powder pressed compact surface moreover easily, influences product quality. Based on the reasons, the continuous powder metallurgy sintering device and the sintering process method thereof are designed, the processing precision and efficiency of the cake-shaped powder pressed compact can be greatly improved, the product quality and the yield are improved, and the continuous powder metallurgy sintering device and the sintering process method thereof are suitable for large-scale popularization.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides the continuous powder metallurgy sintering device and the sintering process method thereof, which greatly improve the processing precision and efficiency of the round cake-shaped powder pressed compact, improve the product quality and the yield, and are suitable for large-scale popularization.

The technical scheme is as follows: in order to achieve the purpose, the continuous powder metallurgy sintering device comprises a pre-sintering area, a sintering area and a cooling area, wherein the pre-sintering area is used for pre-sintering powder pressed compacts, the sintering area is used for sintering the powder pressed compacts at a high temperature, the cooling area is used for cooling the powder pressed compacts, the cooling area is divided into a slow cooling area located at the front part and a quick cooling area located at the rear part, the slow cooling area is used for slowly cooling the powder pressed compacts, and the quick cooling area is used for quickly cooling the powder pressed compacts; the pre-sintering area, the sintering area and the slow cooling area are correspondingly provided with the same continuous mesh belt sintering furnace, and the fast cooling area is correspondingly provided with air-cooled double-gas cooling equipment;

the air-cooled double-gas cooling equipment comprises a gas mixing tank, a fixed gas guide vertical pipe, a rotary joint, a movable gas guide vertical pipe and an air cooling frame which are sequentially connected from bottom to top, and further comprises a connecting frame, a rotary driving mechanism, a liquid nitrogen source and a liquid helium source, wherein:

the gas mixing tank is horizontally arranged, two ends of the gas mixing tank are respectively provided with a nitrogen inlet and a helium inlet, the nitrogen inlet is butted with the liquid nitrogen source through a nitrogen pipeline, the helium inlet is butted with the liquid helium source through a helium pipeline, and nitrogen and helium are mixed in the gas mixing tank to form nitrogen-helium mixed gas for rapidly cooling the cake-shaped powder pressed compact;

the air cooling frame is used for supporting and wrapping the round cake-shaped powder pressed blank, and the top of the air cooling frame is of an openable structure; the frame body forming the air cooling frame is of a hollow structure, an air inlet port which is communicated with the frame body and is butted with the movable air guide vertical pipe is arranged at the center of the bottom of the air cooling frame, air injection holes are uniformly and densely distributed on the inner wall of the air cooling frame, and nitrogen-helium mixed gas in the frame body is sprayed to the surface of the round cake-shaped powder pressed blank from the air injection holes to rapidly cool the round cake-shaped powder pressed blank; the inner wall of the air cooling frame is provided with a movable support body, the round cake-shaped powder pressed compact arranged in the air cooling frame is supported by the movable support body and keeps relative movable arrangement with the air cooling frame, and the surface of the round cake-shaped powder pressed compact has a distance with the inner wall of the air cooling frame;

the movable vertical gas guide pipe is connected to the fixed vertical gas guide pipe through the connecting frame and is in rotating fit with the connecting frame, the rotary driving mechanism is in driving connection with the movable vertical gas guide pipe, and the rotary driving mechanism drives the movable vertical gas guide pipe to drive the gas cooling frame to rotate rapidly relative to the cake-shaped powder pressed compact so as to adjust the relative position of the gas injection hole towards the surface of the cake-shaped powder pressed compact.

Furthermore, a nitrogen gas gathering cover, a helium gas gathering cover and a gas mixing impact plate are arranged inside the gas mixing tank; the gas mixing impact plate is positioned in the middle of the gas mixing tank and is opposite to the fixed gas guide vertical pipe in the middle of the top of the gas mixing tank, and through holes are densely distributed on the surface of the gas mixing impact plate; the large port of the nitrogen gathering cover covers the nitrogen inlet, and the small port of the nitrogen gathering cover is opposite to the mixed gas impact plate; the big port of the helium gathering cover covers a helium inlet, and the small port of the helium gathering cover is opposite to the gas mixing impact plate; the nitrogen gas gathered in the nitrogen gas gathering cover impacts the plate surface on one side of the gas mixing impact plate and is dispersed, and the helium gas gathered in the helium gas gathering cover impacts the plate surface on the other side of the gas mixing impact plate and is dispersed, so that the nitrogen gas and the helium gas are mixed to form nitrogen-helium mixed gas.

Furthermore, a nitrogen release valve, a nitrogen power pump and a nitrogen check valve are sequentially arranged on the nitrogen pipeline along the nitrogen conveying direction;

and a helium gas release valve, a helium gas power pump and a helium gas check valve are sequentially arranged on the helium gas pipeline along the helium gas conveying direction.

Furthermore, the air cooling frame is provided with an outer chamber, the air cooling frame is positioned in the outer chamber, an air inlet interface of the air cooling frame is arranged by penetrating through the bottom of the outer chamber in a rotating and sealing manner, a chamber door of the outer chamber is positioned at the top, and an air outlet valve is arranged on the chamber door.

Further, the air cooling frame comprises two U-shaped frame bodies, four overturning driving mechanisms, four straight plate frame bodies and four deformable air guide pipes; the U-shaped frame body and the straight plate frame body are both hollow structures, and the straight plate frame body is communicated with the U-shaped frame body through the deformable air guide pipe; the two U-shaped frame bodies are mutually vertically and crossly connected in an upward opening posture to form a bearing bracket for bearing the cake-shaped powder pressed blank, and the air inlet port is positioned in the center of the bottom of the bearing bracket; the straight plate frame bodies are correspondingly arranged at the top ends of the supporting brackets one by one through the overturning driving mechanisms, the straight plate frame bodies and the corresponding U-shaped frame bodies are positioned on the same vertical plane, and the overturning driving mechanisms drive the straight plate frame bodies to overturn on the vertical plane where the corresponding U-shaped frame bodies are positioned; the air injection holes are uniformly distributed on the inner wall of the bearing bracket and the inner wall of the straight plate frame body, the movable supporting body is movably arranged on the inner wall of the bearing bracket, and the bottom surface and the side surface of the cake-shaped powder pressed compact are respectively spaced from the inner wall of the bearing bracket;

when the top of the air cooling frame is in an open state, the straight frame body is turned over to an upward vertical state through the turning driving mechanism;

the top of the air cooling frame is in a closed state, the straight plate frame body is turned to an inward horizontal state through the turning driving mechanism, and a space is reserved between the inner wall of the straight plate frame body and the top surface of the cake-shaped powder pressed blank.

Furthermore, the movable support body is a ball which is embedded in a groove on the inner wall of the support bracket and can freely roll in the groove.

Furthermore, the overturning driving mechanism comprises a rotating shaft arranged at the top end of the U-shaped frame body through a supporting plate and a servo motor arranged on the supporting plate and used for driving the rotating shaft, and one end of the straight plate frame body is connected to the rotating shaft.

Further, the rotary driving mechanism comprises a driving motor, a driving gear and a driven outer gear ring; the driving motor is installed on the connecting frame, the driving gear is installed at the output end of the driving motor, the driven outer gear ring is fixedly sleeved on the movable vertical air guide pipe, and the driving gear is meshed with the driven outer gear ring.

A sintering process method of a continuous powder metallurgy sintering device comprises a continuous mesh belt sintering furnace operation section and an air-cooled double-gas cooling equipment operation section which are sequentially carried out;

a) the operation section of the continuous mesh belt sintering furnace comprises: specifically comprises a pre-sintering operation section passing through a pre-sintering area, a high-temperature sintering operation section of the sintering area and a slow cooling operation section of a slow cooling area in sequence

a.1) a pre-burning operation section: adopting nitrogen as protective atmosphere, controlling the heating temperature within the range of 280-700 ℃, improving the strength of the cake-shaped powder pressed compact and removing additives;

a.2) high-temperature sintering operation section: heating indirectly by using a SiC heating element, wherein the heating temperature is controlled within the range of 1125-1140 ℃;

a.3) slow cooling operation section: adopting air to carry out blowing type cooling;

b) air-cooled double-gas cooling equipment operation section

b.1) opening a bin door, driving a straight plate frame body to turn outwards by using a turnover driving mechanism to open the top of an air cooling frame, placing a slowly-cooled cake-shaped powder compact in a support bracket, then driving the straight plate frame body to turn inwards by using the turnover driving mechanism again to close the top of the air cooling frame, closing the bin door and keeping an air outlet valve in an open state;

b.2) opening a nitrogen release valve and a nitrogen check valve, starting a nitrogen power pump, conveying nitrogen formed by liquid nitrogen of a liquid nitrogen source to a gas mixing tank through a nitrogen pipeline, simultaneously opening a helium release valve and a helium check valve, starting the helium power pump, conveying helium formed by liquid helium of a liquid helium source to the gas mixing tank through a helium pipeline, and impacting a gas mixing impact plate together with the nitrogen gathered in the nitrogen gathering cover to disperse and mix the nitrogen and the helium to form nitrogen-helium mixed gas;

and b.3) leading the nitrogen-helium mixed gas into the hollow interior of the frame body of the air cooling frame through the fixed air guide vertical pipe, the rotary joint and the movable air guide vertical pipe in sequence, further rapidly cooling the round cake-shaped powder pressed compact by spraying the nitrogen-helium mixed gas to the surface of the round cake-shaped powder pressed compact from each air jet hole, forming a rapid cooling atmosphere surrounding the round cake-shaped powder pressed compact in the outer chamber by the nitrogen-helium mixed gas, enhancing the cooling effect, and finally discharging the nitrogen-helium mixed gas from the air outlet valve.

Further, in step b.3, the indirect form utilizes the movable air guide standpipe of rotary driving mechanism drive to drive the relative cake form powder compact of air cooling frame and rotate fast, stops afterwards, because the action of gravity of cake form powder compact self to and the effect that the activity bearing was carried out through the movable support body to the cake form powder compact, utilize gravity inertia principle, thereby can adjust the relative position on the surface of fumarole orientation cake form powder compact, guarantee to more comprehensive and the homogenization of the refrigerated cover of the jet-propelled of cake form powder compact.

Has the advantages that: the continuous powder metallurgy sintering device and the sintering process method thereof have the following beneficial effects:

1) the product is rapidly cooled by the air-cooled double-gas cooling equipment, so that the cooling efficiency is greatly improved, the time of exposing the product in the environment at a high temperature is shortened, the oxidation rate is reduced, and the product quality is improved;

2) helium is rare gas and is relatively stable, the chemical property of nitrogen is inactive, and the wafer-shaped powder pressed compact is rapidly cooled by nitrogen-helium mixed gas formed by combining low-temperature helium and low-temperature nitrogen, so that the design scheme is called as a double-low-temperature gas cooling technology, air is isolated, the surface oxidation of a high-temperature product is avoided, the cooling effect is good, and the efficiency is high;

3) in the invention, nitrogen is low in cost and almost harmless, is used as a main cooling gas, helium is a rare gas and is high in cost, and is used as an auxiliary cooling gas, and the flow control is carried out by respectively adopting a nitrogen release valve and a helium release valve; the low-temperature nitrogen has higher temperature than that of the low-temperature helium, the temperature of the mixed nitrogen-helium mixed gas is lower than that of the nitrogen, the cooling efficiency and the cooling effect are better, the low-temperature helium is lighter than the nitrogen, and the mixed nitrogen-helium mixed gas is lighter than the nitrogen with the same volume, so that the gas fluidity is improved, and the product can be cooled more conveniently;

4) the nitrogen-helium mixed gas in the frame is sprayed to the surface of the round cake-shaped powder pressed compact from the gas injection holes to rapidly cool the round cake-shaped powder pressed compact, the gas injection type cooling directly impacts the surface of the round cake-shaped powder pressed compact, the cooling effect is better, and the surface of the round cake-shaped powder pressed compact and the inner wall of the gas cooling frame have a distance, so that the nitrogen-helium mixed gas flows and spreads favorably, and the nitrogen-helium mixed gas atmosphere surrounding the round cake-shaped powder pressed compact is formed;

5) the movable air guide vertical pipe is driven by the rotary driving mechanism to drive the air cooling frame to rotate rapidly relative to the cake-shaped powder pressed compact, so that the relative position of the air injection hole towards the surface of the cake-shaped powder pressed compact can be adjusted, and the covering of the air injection cooling of the cake-shaped powder pressed compact is more comprehensive and uniform.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the overall structure of an air-cooled dual-gas cooling apparatus;

FIG. 3 is a schematic overall view of a partial structure of an air-cooled dual gas cooling apparatus;

FIG. 4 is a schematic structural view of a cake-shaped powder compact and an air-cooling frame;

fig. 5 is a schematic structural view of the air-cooling rack.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The present invention is a specific design scheme that is mainly performed by taking the cake-shaped powder compact 300 as a specific example.

As shown in fig. 1, a continuous powder metallurgy sintering apparatus includes a pre-sintering area S1 for pre-sintering powder compacts, a sintering area S2 for sintering the powder compacts at a high temperature, and a cooling area S3 for cooling the powder compacts, wherein the cooling area S3 is divided into a slow cooling area S3.1 located at the front and a fast cooling area S3.2 located at the rear, the slow cooling area S3.1 is used for slow cooling the powder compacts, and the fast cooling area S3.2 is used for fast cooling the powder compacts; the pre-sintering zone S1, the sintering zone S2 and the quenching zone S3.1 are correspondingly provided with the same continuous mesh belt sintering furnace, and the quenching zone S3.2 is correspondingly provided with air-cooled double-gas cooling equipment. The product is rapidly cooled by the air-cooled double-gas cooling equipment, so that the cooling efficiency is greatly improved, the time of exposing the product in the environment at a high temperature is shortened, the oxidation rate is reduced, and the product quality is improved.

As shown in fig. 2, fig. 3, fig. 4 and fig. 5, the air-cooled dual-gas cooling apparatus includes a gas mixing tank 3, a fixed gas guiding vertical pipe 3c, a rotary joint 4, a movable gas guiding vertical pipe 5 and a gas cooling frame 6, which are sequentially connected from bottom to top, and further includes a connecting frame 8, a rotary driving mechanism 9, a liquid nitrogen source 100 and a liquid helium source 200, wherein: the gas mixing tank 3 is horizontally arranged, two ends of the gas mixing tank are respectively provided with a nitrogen inlet 3a and a helium inlet 3b, the nitrogen inlet 3a is in butt joint with the liquid nitrogen source 100 through a nitrogen pipeline 10, the helium inlet 3b is in butt joint with the liquid helium source 200 through a helium pipeline 20, and nitrogen and helium are mixed in the gas mixing tank 3 to form nitrogen-helium mixed gas for rapidly cooling the cake-shaped powder compact 300; helium is noble gas, and is more stable, and the chemical property of nitrogen gas is very inactive, and the nitrogen helium mist that low temperature helium and low temperature nitrogen gas combined together formed cools off pie powder pressed compact 300 rapidly, calls as two low temperature gas cooling technique in this design, and isolated air avoids high temperature product to take place surface oxidation, and cooling effect is good, efficient.

The air cooling frame 6 is used for supporting and wrapping the cake-shaped powder compact 300, and the top of the air cooling frame 6 is of an openable structure; the frame body forming the air cooling frame 6 is of a hollow structure, an air inlet port 60 which is communicated with the frame body and is butted with the movable air guide vertical pipe 5 is arranged at the center of the bottom of the air cooling frame 6, air injection holes 6102 are uniformly and densely distributed on the inner wall of the air cooling frame 6, nitrogen and helium mixed gas in the frame body is sprayed to the surface of the cake-shaped powder pressed compact 300 from the air injection holes 6102 to rapidly cool the cake-shaped powder pressed compact 300, the air injection cooling directly impacts the surface of the cake-shaped powder pressed compact 300, and the cooling effect is better; the inner wall of the air cooling frame 6 is provided with a movable support 6101, the round cake-shaped powder compact 300 placed in the air cooling frame 6 is supported by the movable support 6101 and is movably arranged relative to the air cooling frame 6, and the surface of the round cake-shaped powder compact 300 and the inner wall of the air cooling frame 6 have a distance, which is beneficial to the flow and spreading of the nitrogen-helium mixed gas, so that the nitrogen-helium mixed gas atmosphere surrounding the round cake-shaped powder compact is formed.

The movable air guide vertical pipe 5 is connected to the fixed air guide vertical pipe 3c through the connecting frame 8, the movable air guide vertical pipe 5 is in rotating fit with the connecting frame 8, the rotary driving mechanism 9 is in driving connection with the movable air guide vertical pipe 5, the rotary driving mechanism 9 drives the movable air guide vertical pipe 5 to drive the air cooling frame 6 to rotate rapidly relative to the cake-shaped powder pressed compact 300, so that the relative position of the air injection holes 6102 towards the surface of the cake-shaped powder pressed compact 300 is adjusted, and the air injection cooling coverage of the cake-shaped powder pressed compact 300 is guaranteed to be more comprehensive and uniform.

A nitrogen gathering cover 31, a helium gathering cover 32 and a mixed gas impact plate 33 are arranged in the mixed gas tank 3; the gas mixing impact plate 33 is positioned in the middle of the gas mixing tank 3 and is opposite to the fixed gas guide vertical pipe 3c in the middle of the top of the gas mixing tank 3, and through holes are densely distributed on the surface of the gas mixing impact plate 33; the large port of the nitrogen gathering cover 31 covers the nitrogen inlet 3a, and the small port of the nitrogen gathering cover is opposite to the gas mixing impact plate 33; the big port of the helium gathering cover 32 covers the helium inlet 3b, and the small port of the helium gathering cover is opposite to the gas mixing impact plate 33; the nitrogen gas of gathering in the nitrogen gas gathering cover 31 strikes one side face and the dispersion of gas mixing impact plate 33, the helium gas of gathering in the helium gas gathering cover 32 strikes the other side face and the dispersion of gas mixing impact plate 33 for nitrogen gas and helium gas mix and constitute nitrogen helium gas mixture, and gas mixing is more abundant, high-efficient, even.

The nitrogen pipeline 10 is sequentially provided with a nitrogen release valve 11, a nitrogen power pump 12 and a nitrogen check valve 13 along the nitrogen conveying direction; the helium pipeline 20 is sequentially provided with a helium release valve 21, a helium power pump 22 and a helium check valve 23 along a helium conveying direction. In the invention, nitrogen is low in cost and almost harmless, is used as a main cooling gas, helium is a rare gas and is high in cost, and is used as an auxiliary cooling gas, and the flow control is carried out by respectively adopting a nitrogen release valve and a helium release valve; the low-temperature nitrogen gas is higher than the low-temperature helium gas in temperature, the mixed nitrogen-helium mixed gas is lower than the nitrogen gas in temperature, the cooling efficiency and the cooling effect are better, the low-temperature helium gas is lighter than the nitrogen gas, and the mixed nitrogen-helium mixed gas is lighter than the nitrogen gas with the same volume, so that the gas fluidity is improved, and the product can be cooled more favorably.

The air cooling frame 6 is provided with an outer chamber 7, the air cooling frame 6 is positioned in the outer chamber 7, an air inlet port 60 of the air cooling frame 6 is arranged by penetrating through the bottom of the outer chamber 7 in a rotating and sealing manner, a chamber door 71 of the outer chamber 7 is positioned at the top, and an air outlet valve 72 is arranged on the chamber door 71.

The air cooling frame 6 comprises two U-shaped frame bodies 61, four overturning driving mechanisms 62, four straight plate frame bodies 63 and four deformable air guide pipes 64; the U-shaped frame body 61 and the straight plate frame body 63 are both hollow structures, and the straight plate frame body 63 is communicated with the U-shaped frame body 61 through a deformable air duct 64; the two U-shaped frame bodies 61 are vertically and crossly connected with each other in an upward opening posture to form a bearing bracket 610 for bearing the round cake-shaped powder pressed blank 300, and the air inlet port 60 is positioned at the center of the bottom of the bearing bracket 610; the straight plate frame bodies 63 are correspondingly arranged at the top ends of the supporting brackets 610 one by one through the turnover driving mechanisms 62, the straight plate frame bodies 63 and the corresponding U-shaped frame bodies 61 are positioned on the same vertical plane, and the turnover driving mechanisms 62 drive the straight plate frame bodies 63 to turn over on the vertical plane where the corresponding U-shaped frame bodies 61 are positioned; the air injection holes 6102 are uniformly distributed on the inner wall of the support bracket 610 and the inner wall of the straight frame 63, the movable support 6101 is movably disposed on the inner wall of the support bracket 610, and the bottom and the side of the cake-shaped powder compact 300 have a distance from the inner wall of the support bracket 610; when the top of the air cooling rack 6 is in an open state, the straight rack body 63 is turned over to an upward vertical state through the turning driving mechanism 62; the top of the air cooling frame 6 is in a closed state, the straight frame body 63 is turned to an inward horizontal state through the turning driving mechanism 62, and the inner wall of the straight frame body 63 has a distance from the top surface of the cake-shaped powder pressed compact 300.

Preferably, the movable support 6101 is a ball that is embedded in a groove on the inner wall of the support bracket 610 and can freely roll in the groove.

The turning driving mechanism 62 comprises a rotating shaft 622 arranged at the top end of the U-shaped frame body 61 through a supporting plate 621 and a servo motor 623 arranged on the supporting plate 621 and used for driving the rotating shaft 622, and one end of the straight frame body 63 is connected to the rotating shaft 622.

The rotary driving mechanism 9 comprises a driving motor 91, a driving gear 92 and a driven outer gear ring 93; the driving motor 91 is installed on the connecting frame 8, the driving gear 92 is installed at the output end of the driving motor 91, the driven outer gear ring 93 is fixedly sleeved on the movable vertical air duct 5, and the driving gear 92 is meshed with the driven outer gear ring 93.

A sintering process method of a continuous powder metallurgy sintering device comprises a continuous mesh belt sintering furnace operation section and an air-cooled double-gas cooling equipment operation section which are sequentially carried out;

a) the operation section of the continuous mesh belt sintering furnace comprises: specifically comprises a pre-sintering operation section passing through a pre-sintering area S1, a high-temperature sintering operation section of a sintering area S2) and a slow cooling operation section of a slow cooling area S3.1 in sequence

a.1) a pre-burning operation section: adopting nitrogen as protective atmosphere, controlling the heating temperature within the range of 280-700 ℃, improving the strength of the cake-shaped powder pressed compact 300 and removing additives;

a.2) high-temperature sintering operation section: heating indirectly by using a SiC heating element, wherein the heating temperature is controlled within the range of 1125-1140 ℃;

a.3) slow cooling operation section: adopting air to carry out blowing type cooling;

b) air-cooled double-gas cooling equipment operation section

b.1) opening the bin door 71, driving the straight plate frame body 63 to turn outwards by using the turnover driving mechanism 62 to open the top of the air cooling frame 6, placing the slowly-cooled cake-shaped powder compact 300 in the supporting bracket 610, then driving the straight plate frame body 63 to turn inwards by using the turnover driving mechanism 62 again to close the top of the air cooling frame 6, closing the bin door 71 and keeping the air outlet valve 72 in an open state;

b.2) opening a nitrogen release valve 11 and a nitrogen check valve 13, starting a nitrogen power pump 12, conveying the liquid nitrogen of a liquid nitrogen source 100 into nitrogen gas to a gas mixing tank 3 through a nitrogen pipeline 10, simultaneously opening a helium release valve 21 and a helium check valve 23, starting a helium power pump 22, conveying the liquid helium of a liquid helium source 200 into helium gas to the gas mixing tank 3 through a helium pipeline 20, and enabling the nitrogen gas collected in a nitrogen gas collection cover 31 and the helium gas collected in a helium gas collection cover 32 to jointly impact a gas mixing impact plate 33 for dispersion and mixing to form nitrogen-helium mixed gas;

b.3) the mixed gas of nitrogen and helium is led into the hollow interior of the frame body of the air cooling frame 6 through the fixed air guide vertical pipe 3c, the rotary joint 4 and the movable air guide vertical pipe 5 in sequence, and then is sprayed to the surface of the cake-shaped powder pressed compact 300 from each air jet hole 6102 to rapidly cool the cake-shaped powder pressed compact 300, and the mixed gas of nitrogen and helium forms a rapid cooling atmosphere surrounding the cake-shaped powder pressed compact 300 in the outer chamber 7, so that the cooling effect is enhanced, and finally the mixed gas of nitrogen and helium is discharged from the air outlet valve 72.

In step b.3, indirectly utilize the rotary driving mechanism 9 to drive movable air guide standpipe 5 and drive the relative cake form powder compact 300 rapid rotation of air cooling frame 6, stop afterwards, because the action of gravity of cake form powder compact 300 self to and the effect that the activity bearing was carried out through movable support body 6101 to cake form powder compact 300, utilize gravity inertia principle, thereby can adjust the relative position on the surface of fumarole 6102 towards cake form powder compact 300, guarantee to more comprehensive and the homogenization of the refrigerated cover of the gas injection of cake form powder compact 300.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.