Compression molding process for air conditioner compressor accessories

Abstract

The invention relates to the technical field of air conditioner compressor accessory powder metallurgy compression molding machining, in particular to an air conditioner compressor accessory compression molding process which comprises the following steps of a, powder selection and pretreatment, b, material mixing, c, compression molding and d, material receiving. In the material receiving step, a buffering module capable of conducting buffering protection on the green bodies is arranged, the buffering module is used for buffering the green bodies in the discharging process, it is guaranteed that the green bodies are not collided when being obliquely conveyed through a conveying channel, and then the green bodies are prevented from being damaged in the material receiving process of die-casting forming; and the forming stability of green bodies and the processing efficiency of received materials are improved.

Description

Technical Field

[0001] This invention relates to the field of powder metallurgy pressing and forming technology for air conditioner compressor parts, and particularly to a pressing and forming process for air conditioner compressor parts. Background Technology

[0002] Air conditioner compressor parts are manufactured using powder metallurgy pressing. Powder metallurgy pressing is a process in which loose metal powder is prepared, loaded into a precision mold, and then compressed into a semi-finished product with a fixed shape, size, density, and strength by applying high pressure through a press. It is also the most commonly used forming method in industry for producing high-precision, small-batch, complex-structure powder metallurgy parts.

[0003] However, green bodies formed by pressing must never be bumped or dropped. Even slight knocks, drops, or friction impacts have a very high probability of rendering them unusable. Green bodies have extremely low strength and are brittle, barely able to withstand their own weight and very gentle handling, and have absolutely no impact resistance.

[0004] Therefore, in existing processing technologies, after metal powder materials are pressed into green blanks by a press, the green blanks are mostly handled manually to avoid collisions. However, manual handling of green blanks is inefficient. As a result, some receiving platforms have been developed on the market. These receiving platforms can automatically receive green blanks through receiving channels. The received green blanks are then dispersed outward by centrifugal force through the rotation of the receiving platform, thereby achieving the collection of green blanks.

[0005] However, when the existing receiving platform is used in the pressing and molding process of air conditioner compressor parts, the green blanks are still damaged by collisions when the receiving platform picks them up. In particular, when the receiving channel of the receiving platform outputs green blanks at an angle, the impact force of the green blanks caused by the angled conveying can easily cause them to collide with the receiving channel at the discharge port, thus causing damage to the green blanks.

[0006] Therefore, there is an urgent need for a pressing process that can achieve non-destructive acceptance of green bodies during the pressing process. Summary of the Invention

[0007] To address the above problems, this invention provides a pressing and molding process for air conditioner compressor parts. Based on existing pressing and molding technology for air conditioner compressor parts, a buffer module is incorporated into the material receiving step to buffer and protect the green blank. The buffer module cushions the green blank during the discharge process, ensuring that the green blank does not collide when it is tilted and conveyed through the conveyor channel. This prevents damage to the green blank during the material receiving process of die casting, improves the molding stability of the green blank, and enhances the processing efficiency of the material receiving process.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A pressing and molding process for an air conditioner compressor part includes the following steps: Step a, Powder selection and pretreatment: Select pre-alloyed Fe-Cu-C powder, remove large agglomerates and impurities from the powder by sieving to ensure powder flowability and molding uniformity, and eliminate powder work hardening, reduce hardness, improve plasticity and pressing performance by annealing, while removing the oxide layer on the powder surface. Step b, mixing: Weigh the alloy powder and base powder from step a according to the formula and add them to the mixer. Dry mix evenly, then add the lubricant and binder in sequence and continue mixing to ensure that the additives evenly coat the powder particles. After mixing, seal and let stand to allow the additives to fully disperse and stabilize the powder flowability. Step c: Pressing and molding. Select a high-precision cemented carbide mold, clean the mold cavity, apply a small amount of release agent, preheat the mold, and fill the mold cavity quantitatively and evenly with the mixed powder through the feeder to ensure consistent filling height. Use bidirectional pressing to make the green blank have uniform density from top to bottom. After reaching the set pressure, hold the pressure and the ejection mechanism will smoothly eject the green blank from the mold. Step d, receiving: The ejected green billet is pushed by the pushing mechanism on the rear side of the alloy mold to the receiving device on the front side of the alloy mold. The green billet enters the conveying channel of the receiving device and arrives at the horizontal receiving tray through the conveying channel. The receiving tray receives the green billet and gradually centrifugally diffuses it to make the green billet output smoothly. The buffer module set in the middle section of the conveying channel and the outlet provides buffer protection for the green billet.

[0009] As an improvement, in step d, the conveying channel sequentially includes a first inclined channel, a horizontal conveying channel and a second inclined channel that are connected to each other. When the second inclined channel outputs a set of green billets, another set of green billets is retained at the connection position between the horizontal conveying channel and the second inclined channel.

[0010] As an improvement, in step d, the buffer module includes a limiting and retaining airbag disposed at the junction of the horizontal conveying channel and the second inclined channel, and a buffer airbag disposed at the outlet of the second inclined channel.

[0011] As an improvement, when the limiting and retaining airbag contracts, the top of the limiting and retaining airbag is recessed to retain the green blank output from the horizontal conveying channel; when the limiting and retaining airbag expands, the top of the limiting and retaining airbag is flat, and the retained green blank is conveyed to the second inclined channel for inclined conveying.

[0012] As an improvement, the buffer airbag includes a deceleration buffer and an anti-collision buffer that are connected together. The deceleration buffer is wavy and located at the discharge port of the second inclined channel, while the anti-collision buffer is arc-shaped and vertically located at the discharge port.

[0013] As an improvement, a protective partition is provided at the discharge port of the second inclined channel. The protective partition includes an arc-shaped protective plate and a semi-circular protective plate. The arc-shaped protective plate is closely attached to the outside of the anti-collision buffer part to provide rigid support for the anti-collision buffer part. The semi-circular protective plate is rotatably disposed on the other side of the discharge port relative to the arc-shaped protective plate.

[0014] As an improvement, in step d, after the receiving tray receives the green billet output from the second inclined channel, the receiving tray drives the green billet to rotate, so that the green billet gradually diffuses through centrifugal force. A magnetic traction module is installed below the receiving tray. The magnetic traction module attracts the semi-circular guard plate and rotates it, allowing the green blank to leave the space of the discharge port.

[0015] As an improvement, the magnetic traction module includes a mounting plate, a permanent magnet component, and an isolation block; The mounting plate is coaxially mounted below the receiving plate, and the mounting plate rotates synchronously with the receiving plate; Several groups of permanent magnet components are vertically mounted on the mounting plate. The permanent magnet components are arranged at equal intervals along the circumference of the mounting plate, and the permanent magnet components are elastically contacted with the bottom of the receiving plate. The isolation block is fixedly installed below the receiving tray. The isolation block is arranged in a sloping shape. When the permanent magnet component comes into contact with the isolation block, the permanent magnet component is elastically compressed and descends, and the green blank adsorbed by the permanent magnet component loses its magnetic adsorption to the semi-circular guard plate.

[0016] As an improvement, in step d, when the semicircular guard plate rotates, a reset airbag is provided on the outer side of the semicircular guard plate. The reset airbag is compressed, and gas is injected into the limiting retention airbag through the air guide tube, so that the limiting retention airbag expands. After the semi-circular guard plate loses its magnetic adsorption, the reset airbag inflates, driving the semi-circular guard plate to reset.

[0017] As an improvement, in step d, a cleaning module is installed above the receiving tray. The cleaning module brushes and cleans the green blanks that have spread on the receiving tray, removing the powder from the surface of the green blanks.

[0018] The beneficial effects of this invention are as follows: (1) Based on the existing air conditioning compressor parts pressing and molding processing technology, the present invention sets up a buffer module in the receiving step to buffer and protect the green blank. The buffer module buffers the green blank during the discharge process, ensuring that the green blank will not collide when it is tilted and conveyed through the conveying channel, thereby avoiding damage to the green blank during the receiving process of die casting and improving the forming stability of the green blank and the processing efficiency of receiving the material. (2) The present invention utilizes a combination of a limiting retention airbag and a buffer airbag. The buffer airbag buffers the green billet output from the conveying channel to avoid collision, while the limiting retention airbag limits and retains the subsequent green billet to prevent the subsequent green billet from colliding with the previously output green billet. This ensures that the green billets output from the front and back will not collide and be damaged. At the same time, the flexible retention of the limiting retention airbag can ensure that the green billet will not collide and be damaged during the retention process, thus ensuring the stability of the green billet output. (3) The present invention sets up a magnetic traction module below the receiving tray, and uses the magnetic traction module to pull the green billet that has been output at the discharge port, so that the green billet can quickly leave the discharge port area and avoid the green billet from being stuck at the discharge port. At the same time, when the magnetic traction module pulls the green billet to move, it can also drive the semi-circular guard plate to rotate and swing, open the discharge port area, and facilitate the green billet to be pulled and transferred for output. After the green billet is output, the semi-circular guard plate can automatically reset to form protection at the discharge port. (4) The present invention compresses the reset airbag on the rear side of the semicircular guard plate by traction, rotation and swing of the semicircular guard plate, so that the gas in the reset airbag is filled into the limiting retention airbag, so that the limiting retention airbag is inflated and expanded, thereby transferring the green blank retained at the limiting retention airbag from the retention airbag to the second inclined channel for output. When the magnetic adsorption traction of the semicircular guard plate is canceled, the reset airbag will be inflated again, so that the semicircular guard plate is reset and the discharge port is protected again. At the same time, the limiting retention airbag is restored to form a limiting position. (5) The present invention provides a cleaning module above the receiving tray. The cleaning module can clean the surface of the synchronously rotating green blank by rotating the receiving tray, removing dust from the surface of the green blank, thereby ensuring the cleanliness of the output green blank surface.

[0019] In summary, this invention has the advantages of stable material collection, high molding quality, and high material collection efficiency, and is especially suitable for the field of powder metallurgy pressing and molding processing technology for air conditioner compressor parts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the molding process of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the material receiving device of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the material receiving device of the present invention. Figure 2 ; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the three-dimensional structure of the conveying channel of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the limiting and retaining airbag of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the buffer airbag of the present invention; Figure 8 This is a three-dimensional structural diagram of the discharge port of the present invention; Figure 9 This is a side view of the receiving tray structure of the present invention; Figure 10 This is a schematic diagram of the three-dimensional structure of the magnetic traction module of the present invention; Figure 11 This is a three-dimensional structural diagram of the permanent magnet component of the present invention; Figure 12 This is a schematic diagram of the three-dimensional structure of the insulating block of the present invention; Figure 13 This is a schematic diagram of the three-dimensional structure of the cleaning module of the present invention.

[0021] Numbering on the map: 100 green billets, 1 receiving device, 1 conveying channel, 11 first inclined channel, 12 horizontal conveying channel, 13 second inclined channel, 131 discharge port, 14 protective partition, 141 arc-shaped guard plate, 142 semi-circular guard plate, 143 reset airbag, 144 air guide pipe, 2 receiving tray, 21 servo motor, 22 retaining ring, 3 buffer module, 31 limiting and retaining airbag, 32 buffer airbag, 321 deceleration buffer part, 322 anti-collision buffer part, 4 magnetic traction module, 41 mounting plate, 42 permanent magnet component, 421 lifting rod, 422 spring, 423 limiting ring, 424 ball bearing, 43 isolating block, 5 cleaning module, 51 cleaning frame, 52 pressure plate, 53 cleaning brush. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Example 1: like Figures 1-7 As shown, a pressing and molding process for an air conditioner compressor part includes the following steps: Step a, Powder selection and pretreatment: Select pre-alloyed Fe-Cu-C powder, remove large agglomerates and impurities from the powder by sieving to ensure powder flowability and molding uniformity, and eliminate powder work hardening, reduce hardness, improve plasticity and pressing performance by annealing, while removing the oxide layer on the powder surface. Step b, mixing: Weigh the alloy powder and base powder from step a according to the formula and add them to the mixer. Dry mix evenly, then add the lubricant and binder in sequence and continue mixing to ensure that the additives evenly coat the powder particles. After mixing, seal and let stand to allow the additives to fully disperse and stabilize the powder flowability. Step c: Pressing and molding. Select a high-precision cemented carbide mold, clean the mold cavity, apply a small amount of release agent, preheat the mold, and fill the mold cavity quantitatively and evenly with the mixed powder through the feeder to ensure consistent filling height. Use bidirectional pressing to make the green blank have uniform density from top to bottom. After reaching the set pressure, hold the pressure and the ejection mechanism will smoothly eject the green blank from the mold. Step d, receiving: The ejected green billet is pushed by the pushing mechanism on the rear side of the alloy mold to the receiving device I on the front side of the alloy mold. The green billet enters the conveying channel 1 of the receiving device I and arrives at the horizontal receiving tray 2 through the conveying channel 1. The receiving tray 2 receives the green billet and gradually centrifugally diffuses it, so that the green billet is output smoothly. The buffer module 3 set in the middle section of the conveying channel 1 and the outlet provides buffer protection for the green billet. The receiving tray 2 is rotated and driven by the servo motor 21 below. The receiving tray 2 is provided with a retaining ring 22 on its circumference. The servo motor 21 drives the receiving tray 2 to rotate at low speed through belt drive. As the receiving tray 2 rotates, the green billet 100 is gradually diffused to the retaining ring 22 of the receiving tray 2. After the green billet 100 touches the retaining ring 22, it moves along the retaining ring 22. It should be emphasized that the retaining ring 22 is made of a material with a certain degree of elasticity, such as rubber.

[0026] It should be noted that in step a, the Fe-Cu-C powder is 100-200 mesh powder; in step b, the formula is Fe powder balance, Cu powder: 1.5%-3%, graphite powder: 0.4%-0.8%, zinc stearate (lubricant): 0.6%-1.0%, epoxy resin (binder): 0.2%-0.5%, and the mixing equipment is a double cone mixer or a V-type mixer with a speed of 20-30 r / min, a premixing time of 30-40 min, a final mixing time of 50-60 min, a standing time of 2-4 h, an ambient temperature of 20-25℃, and a humidity of ≤60%.

[0027] In addition, in step c, the mold material is made of cemented carbide, and the mold preheating temperature is 40-60℃ to reduce the friction between the powder and the mold and improve the surface quality of the green blank. The press is a 60-160T fully automatic powder molding machine with bidirectional pressing, floating female mold, green blank density difference ≤0.1g / cm³, press pressing pressure 550-700MPa, pressing rate 15-25 MPa / s uniform pressing to avoid sudden pressure rise causing green blank delamination and cracks, holding pressure time 3-5s to densify the powder and reduce the elastic aftereffect of the green blank, demolding pressure is 10%-15% of the pressing pressure to ensure smooth demolding and prevent green blank breakage.

[0028] Furthermore, in step d, the specific structure of the receiving device I for buffering the green billet is as follows: In step d, the conveying channel 1 sequentially includes a first inclined channel 11, a horizontal conveying channel 12, and a second inclined channel 13 that are connected to each other. When the second inclined channel 13 outputs a set of green blanks, another set of green blanks is retained at the connection position between the horizontal conveying channel 12 and the second inclined channel 13. The first inclined channel 11 connects the press and the horizontal conveying channel 12. The position of the mold worktable of the press is higher than that of the horizontal conveying channel 12. The second inclined channel 13 connects the horizontal conveying channel 12 and the receiving tray 2. The horizontal height of the receiving tray 2 is lower than that of the horizontal conveying channel 12. The horizontal conveying channel 12 is a horizontal conveyor belt electric conveyor. The green blanks formed by the press are pushed into the first inclined channel 11 by the pushing mechanism, and then conveyed sequentially through the horizontal conveying channel 12 and the second inclined channel 13. The pushing mechanism is a horizontal pushing cylinder with a pushing head.

[0029] In step d, the buffer module 3 includes a limiting and retaining airbag 31 disposed at the junction of the horizontal conveying channel 12 and the second inclined channel 13, and a buffer airbag 32 disposed at the discharge port 131 of the second inclined channel 13.

[0030] When the limiting and retaining airbag 31 contracts, its top is recessed to retain the green billet output from the horizontal conveying channel 12. When the limiting and retaining airbag 31 expands, its top becomes flat, and the retained green billet is conveyed to the second inclined channel 13 for inclined conveying. Specifically, when the green billet conveyed by the horizontal conveying channel 12 reaches the connection position with the second inclined channel 13, the recess of the limiting and retaining airbag 31 causes the green billet to enter the recessed area of ​​the limiting and retaining airbag 31 and be retained there. When the limiting and retaining airbag 31 expands, the recessed area of ​​the limiting and retaining airbag 31 disappears, and through the continuous conveying of the horizontal conveying channel 12, the green billet will pass over the limiting and retaining airbag 31 and reach the second inclined channel 13 for inclined conveying.

[0031] The buffer airbag 32 located at the discharge port includes a deceleration buffer 321 and an anti-collision buffer 322 connected together. The deceleration buffer 321 is wavy and located at the discharge port 131 of the second inclined channel 13. The anti-collision buffer 322 is arc-shaped and vertically located at the discharge port 131. The deceleration buffer 321 and the anti-collision buffer 322 are integrally connected, and the buffer airbag 32 is directly fixed to the arc-shaped guard plate 141, which is fixedly connected to the discharge port 131 of the second inclined channel 13. Therefore, the buffer airbag 32 does not move with the receiving tray 2. Instead of rotating, the buffer is fixed at the discharge port 131. Therefore, when the green billet reaches the discharge port 131, the green billet first slows down by passing through the deceleration buffer 321, and then impacts the anti-collision buffer 322, thereby decelerating the green billet. Specifically, when the green billet passes through the deceleration buffer 321, the deceleration buffer 321 is compressed, and the gas in the deceleration buffer 321 is compressed into the anti-collision buffer 322. When the green billet impacts the anti-collision buffer 322, the gas in the anti-collision buffer 322 is forced back into the deceleration buffer 321. This process is repeated, so that the deceleration buffer 321 and the anti-collision buffer 322 can slow down and prevent the green billet from impacting.

[0032] In addition, it should be noted that the deceleration buffer 321 and the anti-collision buffer 322 have been pre-filled with gas of a corresponding volume, so that the deceleration buffer 321 and the anti-collision buffer 322 are in an inflated state. Therefore, the buffer airbag 32 always has the effect of deceleration and anti-collision.

[0033] Example 2: Referring to Example 1, the difference between Example 2 and Example 1 lies in: like Figures 4-12 As shown, a protective partition 14 is provided at the discharge port 131 of the second inclined channel 13. The protective partition 14 includes an arc-shaped protective plate 141 and a semi-circular protective plate 142. The arc-shaped protective plate 141 is closely attached to the outside of the anti-collision buffer part 322 to provide rigid support for the anti-collision buffer part 322. The semi-circular protective plate 142 is rotatably disposed on the other side of the discharge port 131 relative to the arc-shaped protective plate 141.

[0034] The protective partition 14 separates the area at the discharge port 131, so that the green billet at the discharge port 131 does not collide with other green billets on the receiving tray 2, thereby protecting the green billet that has just been output from the second inclined channel 13.

[0035] Furthermore, in step d, after the receiving tray 2 receives the green billet output from the second inclined channel 13, the receiving tray 2 drives the green billet to rotate, causing the green billet to gradually diffuse through centrifugal force. However, due to the setting of the protective partition 14, it is difficult for the green billet to leave the area of ​​the protective partition 14 as it diffuses through the rotation of the receiving tray 2. Therefore, a magnetic traction module 4 is set below the receiving tray 2. The magnetic traction module 4 adsorbs the semi-circular protective plate 142 and rotates it, allowing the green billet to leave the space of the discharge port 131.

[0036] Furthermore, the magnetic traction module 4 includes a mounting plate 41, a permanent magnet component 42, and an isolation block 43; The mounting plate 41 is coaxially mounted below the receiving plate 2, and the mounting plate 41 rotates synchronously with the receiving plate 2; Several groups of permanent magnet components 42 are vertically mounted on the mounting plate 41. The permanent magnet components 42 are arranged at equal intervals along the circumference of the mounting plate 41, and the permanent magnet components 42 are elastically in contact with the bottom of the receiving plate 2. The isolation block 43 is fixedly installed below the receiving tray 2. The isolation block 43 is arranged in a sloping shape. When the permanent magnet component 42 comes into contact with the isolation block 43, the permanent magnet component 42 is elastically compressed and descends, and the green blank adsorbed by the permanent magnet component 42 loses its magnetic adsorption to the semi-circular guard plate 142.

[0037] Specifically, when the receiving tray 2 rotates, it drives the permanent magnet component 42 to rotate synchronously. The permanent magnet component 42 is vertically mounted on the mounting plate 41 via a lifting rod 421. A spring 422 is sleeved on the lifting rod 421, and a limit ring 423 is provided on the lifting rod 421. The spring 422 abuts against the limit ring 423 and the mounting plate 41. A permanent magnet ring 424 is sleeved on the top of the lifting rod 421, and a ball bearing 424 is embedded in the top of the lifting rod 421. The ball bearing 424 abuts against the lower end face of the receiving tray 2. When the permanent magnet component 42 rotates to the discharge port 131, it will be driven by a strong magnet. The suction force attracts the semi-circular guard plate 142 located at the discharge port 131 through the receiving tray 2. Then, as the receiving tray 2 rotates, the semi-circular guard plate 142 will gradually rotate. As the semi-circular guard plate 142 rotates, the green billet will pass through the semi-circular guard plate 142 and detach from the discharge port 131, thereby realizing the rapid detachment of the green billet from the discharge port 131 and avoiding collision with subsequent green billets. When the permanent magnet component 42 rotates to the point of contact with the isolation block 43, the permanent magnet component 42 will be blocked by the isolation block 43, releasing the magnetic attraction between the permanent magnet component 42 and the semi-circular guard plate 142, and the semi-circular guard plate 142 will automatically reset.

[0038] To further explain, the use of magnetic traction module 4 to rotate the semi-circular guard plate 142 is more flexible than the use of pneumatic push module to drive the semi-circular guard plate 142 to rotate. It will not cause rigid collision with the green billet, thus preventing damage to the green billet.

[0039] Example 3: Referring to Example 1, the difference between Example 3 and Example 1 lies in: like Figure 6 , Figure 8 As shown, in step d, when the semicircular guard plate 142 rotates, a reset airbag 143 is provided on the outer side of the semicircular guard plate 142. The reset airbag 143 is compressed and gas is injected into the limiting retention airbag 31 through the air guide tube 144, causing the limiting retention airbag 31 to expand. After the semicircular guard plate 142 loses its magnetic adsorption, the reset airbag 143 expands, driving the semicircular guard plate 142 to reset.

[0040] When the semi-circular guard plate 142 rotates, it compresses the outer reset airbag 143. The reset airbag 143 is pre-filled with gas. As the reset airbag 143 is compressed, the gas enters the limiting and retaining airbag 31 through the air guide tube 144, thereby causing the limiting and retaining airbag 31 to expand and release the restriction on the green blank. It should be emphasized that the reset airbag 143 and the limiting and retaining airbag 31 are pre-filled with gas. During the expansion of the reset airbag 143... When the movable semicircular guard plate 142 is reset, the limiting retention airbag 31 will be recessed. When the reset airbag 143 is compressed, the limiting retention airbag 31 will expand. The reset airbag 143 is equipped with a tough metal skeleton, which can drive the reset airbag 143 to automatically reset. Compared with the reset of the semicircular guard plate 142 by other elastic elements, the reset airbag 143 can avoid the vibration of the semicircular guard plate 142 caused by the elastic elements, thus avoiding the collision between the semicircular guard plate 142 and the green blank.

[0041] Example 4: Referring to Example 1, the difference between Example 4 and Example 1 lies in the following: like Figure 13 As shown, in step d, a cleaning module 5 is mounted above the receiving tray 2. The cleaning module 5 brushes and cleans the green blanks that have spread on the receiving tray 2, removing the powder from the surface of the green blanks.

[0042] It should be noted that when the receiving tray 2 rotates and drives the green billet to rotate and spread, the cleaning module 5 installed above the receiving tray 2 will brush and clean the surface of the moving green billet. Specifically, the cleaning module 5 includes a cleaning frame 51, a pressure plate 52 and a cleaning brush 53. The cleaning frame 51 is set across the receiving tray 2, the pressure plate is installed in the middle of the cleaning frame 51, and the pressure plate 52 is directly above the discharge port 131. The pressure plate 52 will limit the green billet that arrives at the discharge port 131, while the cleaning brush 53 will brush and clean the surface of the green billet.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressing and molding process for air conditioner compressor parts, characterized in that, Includes the following steps: Step a, Powder selection and pretreatment: Select pre-alloyed Fe-Cu-C powder, remove large agglomerates and impurities from the powder by sieving to ensure powder flowability and molding uniformity, and eliminate powder work hardening, reduce hardness, improve plasticity and pressing performance by annealing, while removing the oxide layer on the powder surface. Step b, mixing: accurately weigh the alloy powder and base powder from step a according to the formula and add them to the mixer. Dry mix evenly, then add the lubricant and binder in sequence and continue mixing to ensure that the additives evenly coat the powder particles. After mixing, seal and let stand to allow the additives to fully disperse and stabilize the powder flowability. Step c: Pressing and molding. Select a high-precision cemented carbide mold, clean the mold cavity, apply a small amount of release agent, preheat the mold, and fill the mold cavity quantitatively and evenly with the mixed powder through the feeder to ensure consistent filling height. Use bidirectional pressing to make the green blank have uniform density from top to bottom. After reaching the set pressure, hold the pressure and the ejection mechanism will smoothly eject the green blank from the mold. Step d, receiving: The ejected green billet is pushed to the receiving device (I) on the front side of the alloy mold by the pushing mechanism on the rear side of the alloy mold. The green billet enters the conveying channel (1) of the receiving device (I) and arrives at the horizontal receiving tray (2) through the conveying channel (1). The receiving tray (2) receives the green billet and gradually centrifugally diffuses it to make the green billet output smoothly. The buffer module (3) set in the middle section of the conveying channel (1) and the outlet provides buffer protection for the green billet.

2. The pressing and molding process for an air conditioner compressor part according to claim 1, characterized in that: In step d, the conveying channel (1) includes a first inclined channel (11), a horizontal conveying channel (12) and a second inclined channel (13) that are connected to each other. When the second inclined channel (13) outputs a set of green blanks, another set of green blanks is retained at the connection position between the horizontal conveying channel (12) and the second inclined channel (13).

3. The pressing and molding process for an air conditioner compressor part according to claim 2, characterized in that: In step d, the buffer module (3) includes a limiting and retaining airbag (31) disposed at the junction of the horizontal conveying channel (12) and the second inclined channel (13), and a buffer airbag (32) disposed at the outlet (131) of the second inclined channel (13).

4. The pressing and molding process for an air conditioner compressor part according to claim 3, characterized in that: When the limiting retention airbag (31) contracts, the top of the limiting retention airbag (31) is recessed to retain the green blank output from the horizontal conveying channel (12). When the limiting retention airbag (31) expands, the top of the limiting retention airbag (31) is flat, and the retained green blank is conveyed to the second inclined channel (13) for inclined conveying.

5. The pressing and molding process for an air conditioner compressor part according to claim 3, characterized in that: The buffer airbag (32) includes a deceleration buffer (321) and an anti-collision buffer (322) connected together. The deceleration buffer (321) is wavy and located at the discharge port (131) of the second inclined channel (13). The anti-collision buffer (322) is arc-shaped and is vertically located at the discharge port (131).

6. The pressing and molding process for an air conditioner compressor part according to claim 5, characterized in that: A protective partition (14) is provided at the discharge port (131) of the second inclined channel (13). The protective partition (14) includes an arc-shaped guard plate (141) and a semi-circular guard plate (142). The arc-shaped guard plate (141) is closely attached to the outside of the anti-collision buffer part (322) to provide rigid support for the anti-collision buffer part (322). The semi-circular guard plate (142) is rotatably disposed on the other side of the discharge port (131) relative to the arc-shaped guard plate (141).

7. The pressing and molding process for an air conditioner compressor part according to claim 6, characterized in that: In step d, after the receiving tray (2) receives the green billet output from the second inclined channel (13), the receiving tray (2) drives the green billet to rotate, so that the green billet gradually diffuses through centrifugal force; A magnetic traction module (4) is provided below the receiving tray (2). The magnetic traction module (4) adsorbs the semi-circular guard plate (142) and rotates it, allowing the green blank to leave the space of the discharge port (131).

8. The pressing and molding process for an air conditioner compressor part according to claim 7, characterized in that: The magnetic traction module (4) includes a mounting plate (41), a permanent magnet component (42), and an isolation block (43). The mounting plate (41) is coaxially mounted below the receiving plate (2), and the mounting plate (41) rotates synchronously with the receiving plate (2); Several groups of permanent magnet components (42) are vertically mounted on the mounting plate (41). The permanent magnet components (42) are arranged at equal intervals along the circumference of the mounting plate (41), and the permanent magnet components (42) are elastically contacted with the bottom of the receiving plate (2). The isolation block (43) is fixedly installed below the receiving tray (2). The isolation block (43) is arranged in a sloping shape. When the permanent magnet component (42) comes into contact with the isolation block (43), the permanent magnet component (42) is elastically compressed and lowered. The green blank adsorbed by the permanent magnet component (42) and the semi-circular guard plate (142) lose their magnetic adsorption.

9. The pressing and molding process for an air conditioner compressor part according to claim 7, characterized in that: In step d, when the semicircular guard plate (142) rotates, a reset airbag (143) is provided on the outer side of the semicircular guard plate (142). The reset airbag (143) is compressed and gas is injected into the limiting retention airbag (31) through the air guide tube (144), causing the limiting retention airbag (31) to expand. After the magnetic adsorption of the semicircular guard plate (142) is canceled, the reset airbag (143) expands, driving the semicircular guard plate (142) to reset.

10. The pressing and molding process for an air conditioner compressor part according to claim 1, characterized in that: In step d, a cleaning module (5) is installed above the receiving tray (2). The cleaning module (5) brushes and cleans the green blanks that have spread on the receiving tray (2) to remove the powder from the surface of the green blanks.

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