Powder metallurgy sintering apparatus and process

Abstract

This invention discloses a powder metallurgy sintering apparatus and process, specifically relating to the field of sintering equipment. The apparatus includes a housing containing multiple heaters arranged on all inner sides of the housing. A placement mechanism is also provided within the housing, comprising a support frame rotatably mounted within the housing. Multiple detachable connecting rods are located at the bottom of the support frame, and multiple fixing components are vertically arranged at equal intervals on the connecting rods. By incorporating both the placement mechanism and the angle adjustment mechanism, the workpiece is mounted on the fixing components. During sintering, the workpiece is driven to perform both circular motion and horizontal reciprocating oscillation, thereby ensuring no interlayer temperature difference between workpieces in multiple placement stations and no internal temperature difference between different surfaces of the workpiece. This not only improves sintering efficiency but also ensures consistent shrinkage and densification among workpieces in the same batch, guaranteeing workpiece quality.

Description

Technical Field

[0001] This invention relates to the field of sintering equipment technology, and more specifically, to a powder metallurgy sintering apparatus and process. Background Technology

[0002] Sintering equipment is an essential step in powder metallurgy processing. In order to transform loosely bonded metal powder blanks into dense mechanical parts with high strength and hardness, metal gear blanks must be sintered in a sintering equipment after pressing. Under strictly controlled temperature and atmosphere, the powder particles are firmly bonded together through atomic diffusion, thereby obtaining parts with the final mechanical properties.

[0003] Existing sintering apparatus typically includes a sintering chamber with a heat preservation function. The sintering chamber usually has a single-layer placement station and a heater arranged horizontally. During operation, the workpiece is placed on the station, the heater is turned on to raise the temperature inside the sintering chamber, and the chamber is kept at that temperature for a specified time. The workpiece is then removed, completing the sintering process. Given that a single sintering process can easily take several hours, to improve production efficiency and equipment utilization, and considering the limited horizontal area of ​​the sintering chamber, a multi-layer layout with multiple placement stations in the vertical direction is used to significantly increase the capacity for a single furnace load.

[0004] However, after setting up multiple placement stations in the sintering box, the different distances between the different placement stations and the heater will generate interlayer temperature differences. In addition, there will also be internal temperature differences between different surfaces of the workpiece. The superposition of these two effects will result in different thermal fields between different placement stations in the sintering box. The shrinkage rate and densification degree of the same batch of workpieces cannot be kept consistent, which will result in the sintering quality of the workpieces being unreliable. Summary of the Invention

[0005] The present invention provides a powder metallurgy sintering apparatus and process, which aims to solve the following problem: In the existing sintering box with multiple placement stations, the different distances between the different placement stations and the heater will generate interlayer temperature differences. In addition, there will also be internal temperature differences between different surfaces of the workpiece. The superposition of these two effects will result in different thermal fields between the different placement stations in the sintering box. As a result, the shrinkage rate and densification degree of the workpieces in the same batch cannot be kept consistent, and the sintering quality of the workpieces cannot be guaranteed.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a powder metallurgy sintering apparatus, comprising a box body, wherein multiple heaters are disposed inside the box body and disposed on all inner sides of the box body, and a placement mechanism is disposed inside the box body, the placement mechanism comprising a support frame, the support frame being rotatably disposed inside the box body, multiple detachable connecting rods being disposed at the bottom of the support frame, and multiple fixing components being vertically disposed at equal intervals on the connecting rods, wherein workpieces are placed on the fixing components, and the support frame being used to drive the workpieces to perform circumferential motion along the center of the support frame inside the box body;

[0007] The support frame is also equipped with an angle adjustment mechanism, which includes a slide rod. The slide rod is slidably mounted on the support frame, and multiple sets of push rods are slidably mounted on the slide rod. The workpiece is located between two push rods in the same set. The vertical movement of the slide rod drives the two push rods in the same set to move synchronously in opposite directions. The vertical movement of the slide rod is also used to drive the workpiece to swing horizontally.

[0008] In a preferred embodiment, the fixing component includes a hollow mounting ball, a locking rod is fixedly disposed inside the hollow mounting ball, a plurality of through holes are opened on the connecting rod, the locking rod is movably disposed in the through holes, a plurality of sliding grooves are opened on the hollow mounting ball, a positioning seat is slidably disposed in the sliding groove, and an elastic element is disposed between the positioning seat and the inner wall of the sliding groove.

[0009] In a preferred embodiment, the angle adjustment mechanism further includes an annular seat, which is fixedly mounted on the top inner wall of the housing. The top end of the slide rod is rolled between the bottom of the annular seat. An elastic element is provided between the support frame and the slide rod. An auxiliary seat is fixedly mounted at the bottom of the support frame. A guide seat is fixedly mounted on the auxiliary seat. Multiple guide seats correspond one-to-one with multiple push rods. The guide seats and push rods are slidably mounted. An elastic element is provided between the push rod and the slide rod.

[0010] In a preferred embodiment, a position switching mechanism is provided inside the housing. The position switching mechanism includes a fixed rod, which is fixedly installed inside the housing. Fixed teeth are fixedly installed on the fixed rod and are adapted to the workpiece.

[0011] In a preferred embodiment, a guide hole is provided on the slide rod, and a horizontal groove is provided on the inner wall of the guide hole. A protrusion is fixedly provided on the push rod, and the push rod is slidably disposed in the guide hole, while the protrusion is slidably disposed in the horizontal groove.

[0012] In a preferred embodiment, the guide seat is provided with an inclined guide surface, and the push rod is provided with a sliding hole, and the guide seat is slidably disposed in the sliding hole.

[0013] In a preferred embodiment, the bottom of the annular seat is provided with an annular groove, and the top of the slide rod is fixed with a horizontally arranged adapter seat. A ball is rolled on the adapter seat and is rolled in the annular groove.

[0014] In a preferred embodiment, a guide groove is provided in the slide groove, a connecting seat is fixedly provided on the positioning seat, the connecting seat is slidably disposed in the guide groove, and an inclined surface is provided on the positioning seat.

[0015] In a preferred embodiment, an insulation layer is fixedly provided on the outside of the box, a door is hinged to the box, and a fan is fixedly provided on the top of the box.

[0016] A sintering process for a powder metallurgy sintering apparatus includes the following steps:

[0017] Step 1: Insert the connecting rod into the center hole of the workpiece, move the workpiece from bottom to top to install the workpiece on the hollow mounting ball, and install multiple connecting rods together;

[0018] Step 2: Close the box door, then turn on multiple heaters to drive the support frame to rotate. The rotation of the support frame drives the workpiece and slide rod to make circular motion along the center of the support frame.

[0019] Step 3: Under the guidance of the annular seat and the elastic force of the second elastic element, the slide bar makes a vertical reciprocating motion. During the movement of the slide bar, the push rod pushes the workpiece to flip horizontally back and forth.

[0020] Step 4: Adjust the distance between the workpiece and the heater by horizontally flipping the workpiece back and forth to avoid temperature differences between different layers of the workpiece and within the workpiece.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention installs the workpiece on a fixed component by setting up a placement mechanism and an angle adjustment mechanism. When sintering the workpiece, the workpiece is driven to make a circular motion while swinging horizontally back and forth. This ensures that there is no interlayer temperature difference between workpieces on multiple placement stations, and there is no internal temperature difference between different surfaces of the workpiece. This not only improves the sintering efficiency, but also ensures that the shrinkage rate and densification degree of workpieces in the same batch are consistent, and the quality of the workpiece is guaranteed.

[0023] 2. By setting a position switching mechanism, when the workpiece is in a horizontal state, the support frame drives the workpiece to move along the central axis of the support frame. The workpiece meshes with the fixed teeth and drives the workpiece to rotate on the hollow mounting ball, thereby adjusting the contact position between the positioning seat and the workpiece, avoiding partial obstruction of the workpiece, and further improving the sintering quality of the workpiece. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0025] Figure 2 This is a cross-sectional view of the main structure of the housing of the present invention.

[0026] Figure 3 This is a cross-sectional view of the support frame of the present invention.

[0027] Figure 4 This is a three-dimensional structural diagram of the hollow mounting ball of the present invention.

[0028] Figure 5 This is a cross-sectional view of the hollow mounting ball of the present invention.

[0029] Figure 6 For the present invention Figure 3 A schematic diagram of the structure of part A.

[0030] Figure 7 This is a schematic diagram of the movement trajectory of the slide bar of the present invention.

[0031] Figure 8 This is a schematic diagram of the front view of the fixed tooth structure of the present invention.

[0032] Figure 9 This is a schematic diagram of the sintering process of the present invention.

[0033] The attached diagram is labeled as follows: 1. Box body; 11. Insulation layer; 12. Box door; 13. Fan; 14. Heater; 2. Placement mechanism; 21. Support frame; 22. Connecting rod; 221. Through hole; 23. Fixing component; 231. Hollow mounting ball; 232. Locking rod; 233. Slide groove; 234. Positioning seat; 235. Elastic element one; 3. Angle adjustment mechanism; 31. Ring seat; 32. Elastic element two; 33. Auxiliary seat; 331. Guide seat; 34. Push rod; 35. Elastic element three; 36. Slide rod; 4. Position switching mechanism; 41. Fixing rod; 42. Fixing tooth; 5. Workpiece. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0035] Refer to the instruction manual appendix Figure 1 , Figure 2 A powder metallurgy sintering apparatus includes a housing 1, a plurality of heaters 14 are provided inside the housing 1 and are provided on all the inner sides of the housing 1. A placement mechanism 2 is provided inside the housing 1. The placement mechanism 2 includes a support frame 21, which is rotatably disposed inside the housing 1. A plurality of detachable connecting rods 22 are provided at the bottom of the support frame 21. A plurality of fixing components 23 are vertically arranged at equal intervals on the connecting rods 22. A workpiece 5 is placed on the fixing components 23. The support frame 21 is used to drive the workpiece 5 to make a circular motion along the center of the support frame 21 inside the housing 1.

[0036] An angle adjustment mechanism 3 is also provided on the support frame 21. The angle adjustment mechanism 3 includes a slide rod 36, which is slidably mounted on the support frame 21. Multiple sets of push rods 34 are slidably mounted on the slide rod 36. The workpiece 5 is located between two push rods 34 in the same set. The vertical movement of the slide rod 36 drives the two push rods 34 in the same set to move synchronously in opposite directions. When the slide rod 36 moves vertically downward, the push rod 34 above the workpiece 5 moves toward the workpiece 5, and the push rod 34 below moves toward the direction away from the workpiece 5. When the slide rod 36 moves vertically upward, the push rod 34 above the workpiece 5 moves toward the direction away from the workpiece 5, and the push rod 34 below moves toward the workpiece 5. The vertical movement of the slide rod 36 is also used to drive the workpiece 5 to swing horizontally.

[0037] It should be noted that an insulation layer 11 is fixedly installed on the outer side of the chamber 1, a door 12 is hinged to the chamber 1, and a fan 13 is fixedly installed on the top of the chamber 1. The fan 13 is used to introduce a gas atmosphere for assisting sintering into the chamber 1. A motor is fixedly installed on the chamber 1, and the output shaft of the motor extends into the chamber 1 and is fixedly installed with a support frame 21. The top of the chamber 1 and the output end of the chamber 1 are insulated. When the door 12 is closed, a closed space is formed inside the chamber 1. Multiple heaters 14 are installed on all the inner sides of the chamber 1, that is, heaters 14 are also installed on the inner side of the door 12, that is, heaters 14 are installed on the front, back, left, and right inner walls of the chamber 1.

[0038] It should also be noted that each support frame 21 is equipped with a fixing component 23, and two adjacent support frames 21 are connected by threads. After multiple support frames 21 are installed together, they form a vertically arranged multi-layer placement station.

[0039] The specific implementation scenario is as follows: (Refer to) Figure 2 and Figure 4 Insert the connecting rod 22 into the center hole of the workpiece 5 from top to bottom, install the workpiece 5 on the fixing component 23, and then install multiple connecting rods 22 together by threaded connection to form a multi-layer placement station, with workpiece 5 placed on each placement station. Then close the box door 12 and turn on multiple heaters 14. The heaters 14 can gradually increase the temperature inside the box 1. The heaters 14 serve as heat sources, and the local temperature inside the box 1 near the heaters 14 will be higher than the local temperature away from the heaters 14. At this time, start the motor. The rotation of the motor output drives the support frame 21 to rotate. The rotation of the support frame 21 output drives the connecting rod 22 to move in a circle around the center of the support frame 21. During the rotation of the connecting rod 22, refer to Figure 7The workpiece 5 is driven to swing back and forth. During the swing, the distance between the workpiece 5 and the heater 14 on the multi-layer placement station can be adjusted to ensure that the distance between the workpiece 5 and the heater 14 on the multi-layer placement station is the same. In addition, the workpiece 5 can also prevent the temperature difference between different surfaces of the workpiece 5 during the swing.

[0040] Compared with the existing technology, by setting up the placement mechanism 2 and the angle adjustment mechanism 3, the workpiece 5 is installed on the fixed component 23. When sintering the workpiece 5, the workpiece 5 is driven to make a circular motion and a horizontal reciprocating swing, thereby ensuring that there is no interlayer temperature difference between the workpieces 5 on the multi-layer placement station, and there is no internal temperature difference between different surfaces of the workpiece. This not only improves the sintering efficiency, but also ensures that the shrinkage rate and densification degree of the workpieces in the same batch are consistent, and the quality of the workpieces is guaranteed.

[0041] It is worth noting that although the chamber 1 has multiple placement stations, and heaters 14 can be installed at the top and bottom of each placement station to mitigate the temperature difference between the multiple placement stations and the temperature difference within the workpiece, this solution requires more heating elements, significantly increasing temperature control costs, resulting in insufficient energy utilization efficiency and a relatively rigid interlayer layout. In contrast, the technical solution adopted in this paper abandons the passive approach of combating thermal gradients and instead adopts a dynamic adjustment method. By driving the workpiece 5 to perform a combined rotation and tilting motion within the chamber 1, the physical conditions for forming a fixed temperature difference are fundamentally eliminated. This significantly reduces system complexity and manufacturing costs while achieving dual uniformity of the thermal field in both time and space domains. This not only results in higher energy utilization efficiency but also significantly improves the consistency of product precision and process adaptability.

[0042] Refer to the instruction manual appendix Figure 5 , Figure 6The most common power source for the vertical movement of the drive slide bar 36 is a linear drive device such as a cylinder. However, the environment inside the housing 1 is high-temperature during operation, so adding a power source device as the drive source is not suitable in the context of this solution. To solve the above problem, specifically, the fixing component 23 includes a hollow mounting ball 231, a locking rod 232 is fixedly installed inside the hollow mounting ball 231, multiple through holes 221 are opened on the connecting rod 22, the locking rod 232 is movably installed in the through holes 221, multiple sliding grooves 233 are opened on the hollow mounting ball 231, a positioning seat 234 is slidably installed in the sliding groove 233, and an elastic element 235 is provided between the positioning seat 234 and the inner wall of the sliding groove 233. A movable hole is opened at the center of the hollow mounting ball 231, and the diameter of the top and bottom of the movable hole is larger than the diameter at the middle position. The angle adjustment mechanism 3 also includes an annular seat 31, which is fixedly mounted on the top inner wall of the housing 1. The top end of the slide rod 36 is rolled against the bottom end of the annular seat 31. An elastic element 32 is provided between the support frame 21 and the slide rod 36. An auxiliary seat 33 is fixedly mounted at the bottom of the support frame 21, and a guide seat 331 is fixedly mounted on the auxiliary seat 33. Multiple guide seats 331 correspond one-to-one with multiple push rods 34. The guide seats 331 and push rods 34 are slidably mounted. An elastic element 35 is provided between the push rod 34 and the slide rod 36. A guide hole is provided on the slide rod 36, and a horizontal groove is provided on the inner wall of the guide hole. A protrusion is fixedly mounted on the push rod 34, which is slidably mounted in the guide hole, and the protrusion is slidably mounted in the horizontal groove. An inclined guide surface is provided on the guide seat 331, and a sliding hole is provided on the push rod 34. The guide seat 331 is slidably mounted in the sliding hole. The bottom of the annular seat 31 has an annular groove, and the top of the slide rod 36 is fixed with a horizontally arranged adapter seat. A ball is rolled on the adapter seat and is rolled in the annular groove. A guide groove is provided in the slide groove 233, and a connecting seat is fixed on the positioning seat 234. The connecting seat is slidably arranged in the guide groove, and the positioning seat 234 is provided with an inclined surface.

[0043] It should be noted that elastic element 2 32 is a spring, and the spring is located between slide rod 36 and support frame 21; elastic element 35 is a spring, and the spring is located between push rod 34 and elastic element 35; elastic element 1 235 is also a spring, and the spring is located between positioning seat 234 and inner wall of slide groove 233. (Refer to...) Figure 3 The bottom of the annular seat 31 is provided with undulations, that is, the annular seat 31 forms a columnar groove cam. When the slide rod 36 moves in a circle along the support frame 21, the top of the slide rod 36 will make vertical reciprocating motion under the action of the undulations at the bottom of the annular seat 31 and in conjunction with the elasticity of the elastic element 32.

[0044] It should also be noted that the tilting directions of the corresponding guide surfaces of the two guide seats 331 are opposite. That is, when the two push rods 34 in the same group move vertically in the same direction, the two push rods 34 move in opposite directions in the same direction, so as to avoid mechanical interference to the workpiece 5 when the push rod 34 pushes the workpiece 5 to tilt.

[0045] In this plan, refer to Figure 5 , Figure 6 and Figure 7 When the slide rod 36 moves vertically downward, under the guidance of the guide seat 331 and the elastic force of the elastic element 35, the push rods 34 in the same group above the workpiece 5 move towards the workpiece 5, while the push rods 34 in the same group below the workpiece 5 move away from the workpiece 5. As the push rods 34 above the workpiece 5 continue to move downward, the workpiece 5 is tilted. When the slide rod 36 moves vertically upward, the two push rods 34 in the same group move in opposite directions. That is, the push rod 34 above the workpiece 5 moves away from the workpiece 5, while the push rod 34 below the workpiece 5 moves closer to the workpiece 5, thus achieving the effect of tilting the workpiece 5 in the opposite direction through the push rod 34 below.

[0046] The support frame 21 drives the workpiece 5 to rotate inside the box 1. The push rod 34 adjusts the horizontal swing of the workpiece 5, which not only adjusts the posture of the workpiece 5 so that there is no temperature difference between layers between the multi-layer placement stations, but also makes the temperature inside the box 1 more uniform by rotating the support frame 21, avoiding local temperature differences inside the box 1, and further improving the sintering stability of the workpiece 5 inside the box 1.

[0047] It should be noted that the length of the guide seat 331 and the slope of the inclined guide surface can be readjusted and set according to the usage requirements. The schematic diagram provided in this solution only provides one way to solve the problem, that is, the angle of the workpiece 5 can be further improved by adjusting the length of the guide seat 331 and the slope of the guide surface. As a mature existing technology, it will not be elaborated on here.

[0048] Refer to the instruction manual appendix Figure 8 Since the positioning seat 234 is in contact with the bottom of the workpiece 5, the positioning seat 234 will block part of the bottom area of ​​the workpiece 5. In order to ensure the sintering quality, specifically, a position switching mechanism 4 is provided in the box 1. The position switching mechanism 4 includes a fixing rod 41, which is fixedly installed in the box 1. A fixing tooth 42 is fixedly installed on the fixing rod 41, and the fixing tooth 42 is adapted to the workpiece 5.

[0049] It should be noted that a fixing tooth 42 is provided inside the housing 1. When the workpiece 5 is in a horizontal state, as the support frame 21 continuously drives the workpiece 5 to rotate around the center of the annular seat 31, the workpiece 5 will mesh with the fixing rod 41. After the workpiece 5 meshes with the fixing rod 41, it will drive the workpiece 5 to rotate around the center of the connecting rod 22, thereby changing the contact position between the workpiece 5 and the positioning seat 234 and ensuring the sintering quality of the workpiece 5.

[0050] Refer to the instruction manual appendix Figure 9 A sintering process for a powder metallurgy sintering apparatus includes the following steps:

[0051] Step 1: Insert the connecting rod 22 into the center hole of the workpiece 5, move the workpiece 5 from bottom to top to install the workpiece 5 on the hollow mounting ball 231, and install multiple connecting rods 22 together;

[0052] Step 2: Close the box door 12, then turn on multiple heaters 14 to drive the support frame 21 to rotate. The rotation of the support frame 21 drives the workpiece 5 and the slide rod 36 to move in a circle along the center of the support frame 21.

[0053] Step 3: Under the guidance of the ring seat 31 and the elastic force of the second elastic element 32, the slide rod 36 makes a vertical reciprocating motion. During the movement of the slide rod 36, the push rod 34 pushes the workpiece 5 to flip horizontally back and forth.

[0054] Step 4: The horizontal reciprocating flipping of workpiece 5 adjusts the distance between workpiece 5 and heater 14 to avoid interlayer temperature difference and internal temperature difference of workpiece 5 on different layers of fixing assembly 23.

[0055] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A powder metallurgy sintering apparatus, characterized in that, The device includes a housing (1), which contains multiple heaters (14) arranged on all inner sides of the housing (1). The housing (1) also contains a placement mechanism (2), which includes a support frame (21) rotatably disposed within the housing (1). The support frame (21) has multiple detachable connecting rods (22) at its bottom, and multiple fixing components (23) are vertically arranged at equal intervals on the connecting rods (22). A workpiece (5) is placed on the fixing components (23). The support frame (21) is used to drive the workpiece (5) to make a circular motion along the center of the support frame (21) within the housing (1). An angle adjustment mechanism (3) is also provided on the support frame (21). The angle adjustment mechanism (3) includes a slide rod (36). The slide rod (36) is slidably disposed on the support frame (21). Multiple sets of push rods (34) are slidably disposed on the slide rod (36). The workpiece (5) is located between two push rods (34) in the same set. The vertical movement of the slide rod (36) drives the two push rods (34) in the same set to move synchronously in opposite directions. The vertical movement of the slide rod (36) is also used to drive the workpiece (5) to swing horizontally. The angle adjustment mechanism (3) also includes an annular seat (31), which is fixedly installed on the top inner wall of the box (1). The top end of the slide rod (36) is rolled between the bottom of the annular seat (31). An elastic element (32) is provided between the support frame (21) and the slide rod (36). An auxiliary seat (33) is fixedly installed at the bottom of the support frame (21). A guide seat (331) is fixedly installed on the auxiliary seat (33). Multiple guide seats (331) correspond one-to-one with multiple push rods (34). The guide seat (331) and the push rod (34) are slidably arranged. An elastic element (35) is provided between the push rod (34) and the slide rod (36).

2. The powder metallurgy sintering apparatus according to claim 1, characterized in that: The fixing component (23) includes a hollow mounting ball (231), a locking rod (232) is fixedly installed inside the hollow mounting ball (231), a plurality of through holes (221) are opened on the connecting rod (22), the locking rod (232) is movably installed in the through holes (221), a plurality of sliding grooves (233) are opened on the hollow mounting ball (231), a positioning seat (234) is slidably installed in the sliding groove (233), and an elastic element (235) is provided between the positioning seat (234) and the inner wall of the sliding groove (233).

3. The powder metallurgy sintering apparatus according to claim 2, characterized in that: The box (1) is provided with a position switching mechanism (4), which includes a fixing rod (41). The fixing rod (41) is fixedly installed inside the box (1), and a fixing tooth (42) is fixedly installed on the fixing rod (41). The fixing tooth (42) is adapted to the workpiece (5).

4. The powder metallurgy sintering apparatus according to claim 3, characterized in that: The slide rod (36) has a guide hole, and the inner wall of the guide hole has a horizontal groove. The push rod (34) has a protrusion fixedly installed. The push rod (34) is slidably installed in the guide hole, and the protrusion is slidably installed in the horizontal groove.

5. A powder metallurgy sintering apparatus according to claim 4, characterized in that: The guide seat (331) is provided with an inclined guide surface, and the push rod (34) is provided with a sliding hole. The guide seat (331) is slidably disposed in the sliding hole.

6. The powder metallurgy sintering apparatus according to claim 5, characterized in that: The bottom of the annular seat (31) is provided with an annular groove, and the top of the slide rod (36) is fixed with a horizontally arranged adapter seat. A ball is rolled on the adapter seat and is rolled in the annular groove.

7. A powder metallurgy sintering apparatus according to claim 6, characterized in that: The slide groove (233) is provided with a guide groove, and the positioning seat (234) is fixedly provided with a connecting seat. The connecting seat is slidably disposed in the guide groove, and the positioning seat (234) is provided with an inclined surface.

8. A powder metallurgy sintering apparatus according to claim 7, characterized in that: An insulation layer (11) is fixedly installed on the outside of the box (1), a door (12) is hinged on the box (1), and a fan (13) is fixedly installed on the top of the box (1).

9. A sintering process for a powder metallurgy sintering apparatus as described in claim 8, characterized in that, Includes the following steps: Step 1: Insert the connecting rod (22) into the center hole of the workpiece (5), move the workpiece (5) from bottom to top, install the workpiece (5) on the hollow mounting ball (231), and install multiple connecting rods (22) together; Step 2: Close the box door (12), then turn on multiple heaters (14) to drive the support frame (21) to rotate. The rotation of the support frame (21) drives the workpiece (5) and the slide rod (36) to make circular motion along the center of the support frame (21). Step 3: Under the guidance of the ring seat (31) and the elastic force of the second elastic element (32), the slide rod (36) makes a vertical reciprocating motion. During the movement of the slide rod (36), the push rod (34) pushes the workpiece (5) to flip horizontally. Step 4: The horizontal reciprocating flipping of the workpiece (5) adjusts the distance between the workpiece (5) and the heater (14) to avoid the temperature difference between the workpiece (5) on different layers of the fixing assembly (23) and the temperature difference within the workpiece (5).

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