VVT chain wheel powder metallurgy forming auxiliary equipment and forming method thereof

Abstract

The invention discloses forming auxiliary equipment for VVT chain wheel powder metallurgy and a forming method of the forming auxiliary equipment, and relates to the field of powder metallurgy. The forming auxiliary equipment comprises a supporting main plate, a powder box is arranged on the left side of the top end of the supporting main plate, a mold box is arranged on the right side of the top end of the supporting main plate, and a shaft rod is arranged at the right end of the powder box; four magnetic guide plates are uniformly arranged on the surface of the shaft rod, the surface of the powder box is sleeved with a pressing plate, fixing racks are arranged on the front side and the rear side of the top end of the supporting main plate, and the magnetic guide plates are used for continuously rotating in the moving process of the powder box; according to the powder cleaning and recycling system, missing powder can be efficiently adsorbed, the situation that the operation of equipment is affected by accumulation of the powder is avoided, meanwhile, the cleaning efficiency of the equipment is improved, the adsorbed powder is scraped and conveyed into the powder box, automatic recycling and recycling of the powder are achieved, waste of raw materials is reduced, and the efficient and automatic powder cleaning and recycling system is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of powder metallurgy, and in particular to a forming auxiliary device for VVT sprocket powder metallurgy and a forming method thereof. Background Art

[0002] Powder metallurgy is a technology that manufactures parts by pressing metal powders into shape and then through a sintering process. The powder metallurgy process has been widely used in the automotive manufacturing field, such as VVT sprockets. VVT sprockets are important components in automotive engines, and their performance directly affects the timing control of valves. As a key component in the automotive industry, the production of sprockets needs to meet the requirements of large quantities and high efficiency. Sprockets usually use high-strength and wear-resistant metal powders, such as iron-based materials, which have a high material cost and need to minimize waste. During the part forming process, metal powders may scatter due to equipment vibration, improper operation, or mold design defects. If the scattered powders cannot be recovered in time, it may cause waste, increase production costs, the scattered powders are likely to accumulate on the surface of the equipment, affecting the normal operation of the equipment and increasing maintenance costs, and the diffusion of metal powders may also affect the workshop environment and the health of workers. Summary of the Invention

[0003] (1) Technical problems to be solved: Aiming at the above-mentioned disadvantages of the prior art, the present invention provides a forming auxiliary device for VVT sprocket powder metallurgy and a forming method thereof, which can effectively solve the problems of the prior art.

[0004] (2) Technical solutions: To achieve the above purposes, the present invention is realized through the following technical solutions: In a first aspect, the present invention discloses a forming auxiliary device for VVT sprocket powder metallurgy and a forming method thereof, including a supporting main board. On the left side of the top of the supporting main board, there is a powder box. On the right side of the top of the supporting main board, there is a mold box. On the right end of the powder box, there is a shaft rod. Four magnetic guide plates are evenly arranged on the surface of the shaft rod. A pressing plate is sleeved on the surface of the powder box. On the front and back sides of the top of the supporting main board, there are fixed racks. The magnetic guide plates are used to continuously rotate during the movement of the powder box, and synchronously trigger an energization action to generate magnetism, and adsorb and collect the remaining powder left on the top of the supporting main board. On the right side of the powder box, there is a conveyor belt. The conveyor belt is used to scrape the remaining powder adsorbed on the surface of the magnetic guide plate and convey the remaining powder to the powder box following the rotation action of the shaft rod. A cover plate is slidably connected to the right side of the supporting main board. The cover plate is used to be triggered when the conveyor belt is in the conveying state, and perform cyclic upward and downward displacements to receive the remaining powder conveyed by the conveyor belt and reflux it into the powder box.

[0005] Further, magnetic conductors are uniformly and fixedly connected to the surface of the magnetic conduction plate, coils are sleeved on the surfaces of the magnetic conductors, and when the coils are powered on, magnetic force is generated by the magnetic conductors and the magnetic conduction plate.

[0006] Further, both the front and rear ends of the shaft rod are rotationally connected to the inner wall of the powder box. The front end of the shaft rod passes through the powder box and is fixedly connected with a first transmission gear. The bottom ends on both the left and right sides of the fixed rack are fixedly connected to the top end of the support main board, and the bottom end of the first transmission gear is meshed with the top end of the fixed rack.

[0007] Further, a first transmission rod is rotationally connected to the left side inside the conveyor track, a second transmission rod is rotationally connected to the right side inside the conveyor track. Both the front and rear ends of the first transmission rod and the second transmission rod are rotationally connected to the inner wall of the powder box. Both the front and rear ends of the first transmission rod pass through the powder box and are fixedly connected with second transmission gears. The top ends of the second transmission gears are meshed with the bottom end of the fixed rack. Sector gears are fixedly connected to the front and rear of the second transmission gears, and toothed plates are meshed with the left ends of the sector gears.

[0008] Further, the bottom ends of the toothed plates are fixedly connected to the right ends of the pressing plates. Telescopic movable rods are arranged at the top ends of the toothed plates. The bottom end of the inner rod of the telescopic movable rod is fixedly connected to the top end of the toothed plate. The top end of the outer rod of the telescopic movable rod is fixedly connected to the surface of the powder box. A first torsion spring is sleeved on the inner rod of the telescopic movable rod. One end of the first torsion spring is fixedly connected to the inner rod of the telescopic movable rod, and the other end of the first torsion spring is fixedly connected to the outer rod of the telescopic movable rod.

[0009] Further, sliding rods are fixedly connected to the ends of the toothed plates close to each other. The sliding rods are all slidably connected to the surface of the powder box, and the ends of the sliding rods close to each other are fixedly connected to the surface of the cover plate.

[0010] Further, second torsion springs are uniformly arranged at the top end of the cover plate. The top ends of the second torsion springs are all fixedly connected to the inner wall of the powder box, and the bottom ends of the second torsion springs are all fixedly connected to the top end of the cover plate.

[0011] In a second aspect, the present invention also discloses a forming method for a VVT sprocket powder metallurgy, including the following steps: Step 1: Check the power-on state of the coil and the magnetic force generation state on the surfaces of the magnetic conductor and the magnetic conduction plate, and make the cover plate in an initial low-position standby state; Step 2: Deploy a traction device at the powder box, inject metallurgical powder into the left powder box, start the traction device to pull the powder box to move rightward, and displace it to the mold box, so that the metallurgical powder is injected into the mold box. During the displacement of the powder box, the pressing plate performs a powder density cyclic homogenization and flattening process on the metallurgical powder filled inside the mold box. Step 3: When the traction device is reset, the powder box is in the return state, the shaft rod is in the rotating state, several coils on the side away from the conveyor track are energized, and the associated magnetic guide plates generate magnetic force to adsorb the metallurgical powder remaining on the surface of the support main board. When the magnetic guide plate switches to the near conveyor track, the coil is de-energized, and the associated magnetic guide plate releases the magnetic force; Step 4: The conveyor track scrapes and conveys the powder collected by the magnetic guide plate, and the cover plate is in a continuous opening and closing state to re-inject the metallurgical powder into the powder box cavity; Step 5: After the powder box is completely reset, the coil is powered off, the magnetic guide plate is demagnetized, and all moving parts are reset to the initial working position.

[0012] Furthermore, the magnetic conductor in Step 1 is a magnetically conductive rod body extending axially, and a spiral guide groove is provided on its outer surface. The coil is a segmented conductive ring nested in the spiral guide groove, and adjacent conductive rings are separated by an insulating gap. The coil receives power supply from a preset fixed power supply module and forms an intermittent power-on circuit, so that the magnetic conductor generates an axial gradient magnetic field and drives the corresponding magnetic guide plate to generate magnetic force.

[0013] Furthermore, four groups of magnetic guide plates are evenly arranged on the surface of the shaft rod in Step 3. The number of each group of magnetic guide plates is not less than three. When the shaft rod is in the rotating state, only one group of magnetic guide plates on the side close to the conveyor track is in the de-energized state.

[0014] (III) Beneficial effects: Adopting the technical solution provided by the present invention, compared with the known prior art, it has the following beneficial effects: 1. Through the linkage design of the magnetic force adsorption of the magnetic guide plate, the conveyor track, and the cover plate, the metal remaining powder scattered in the forming area is adsorbed in real time during the movement of the powder box, and is scraped and conveyed by the conveyor track. As the cover plate continuously reciprocates to open and close, the remaining powder is recycled and injected into the powder box, realizing the serial recovery of the remaining powder, and simultaneously driving the pressing plate to flatten the filled metallurgical powder. Compared with the traditional manual cleaning method, this structure greatly improves the reuse rate of the remaining powder, significantly reduces the loss of powder metallurgy raw materials, and can reduce the unit production cost.

[0015] 2. Through the synergistic action of the coil energization and the magnetic conductor, the local magnetic field is triggered only when the magnetic guide plate rotates to the specified position. This dynamic magnetic control strategy accurately limits the adsorption range around the movement track of the powder box, not only ensuring the effective capture of the remaining powder, but also avoiding the problem of magnetic pollution of the equipment caused by the long-term adsorption of traditional permanent magnets, and reducing the impurity content of the product. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the enlarged partial structure at A in the present invention; Figure 3 Schematic diagram of the three-dimensional structure of the first transmission gear, magnetic conductor, coil and magnetic guide plate in the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the shaft rod, magnetic conductor, coil and magnetic guide plate in the present invention; Figure 5 Schematic diagram of the overall three-dimensional structure of the present invention from another angle; Figure 6 Schematic diagram of the three-dimensional structure of the cover plate, second torsion spring, pressing plate and toothed plate in the present invention; Figure 7 Schematic diagram of the side sectional structure of the powder box and the cover plate in the present invention; Figure 8 Schematic diagram of the side sectional structure of the cover plate, conveyor track and shaft rod in the present invention.

[0018] The reference numerals in the figure respectively represent: 1, supporting main board; 2, powder box; 3, mold box; 4, shaft rod; 5, magnetic conductor; 6, coil; 7, magnetic guide plate; 8, first transmission rod; 9, first transmission gear; 10, second transmission rod; 11, fixed rack; 12, second transmission gear; 13, sector gear; 14, toothed plate; 15, pressing plate; 16, telescopic movable rod; 17, first torsion spring; 18, cover plate; 19, sliding rod; 20, second torsion spring; 21, conveyor track. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0020] The following will further describe the present invention with reference to the embodiments.

[0021] Embodiment 1: A forming auxiliary device for a VVT sprocket powder metallurgy in this embodiment is as follows Figures 1-8 shown, including a support main board 1. On the left side of the top of the support main board 1, there is a powder box 2. On the right side of the top of the support main board 1, there is a mold box 3. On the right end of the powder box 2, there is a shaft rod 4. On the surface of the shaft rod 4, four magnetic guide plates 7 are evenly arranged. On the surface of the magnetic guide plates 7, magnetic conductors 5 are evenly fixedly connected. Coils 6 are sleeved on the surfaces of the magnetic conductors 5. When the coils 6 are powered on, the magnetic conductors 5 and the magnetic guide plates 7 generate magnetic force; A pressure plate 15 is sleeved on the surface of the powder box 2. On the front and rear sides of the top of the support main board 1, there are fixed racks 11. The magnetic guide plates 7 are used to continuously rotate during the movement of the powder box 2, and synchronously trigger the energization action to generate magnetic force, and adsorb and collect the remaining powder left on the top of the support main board 1. On the right side of the powder box 2, there is a conveyor track 21. The conveyor track 21 is used to scrape the remaining powder adsorbed on the surface of the magnetic guide plate 7, and convey the remaining powder to the powder box 2 along with the rotation action of the shaft rod 4. On the right side of the support main board 1, there is a cover plate 18 which is slidably connected. The cover plate 18 is used to be triggered when the conveyor track 21 is in the conveying state, and perform cyclic upward and downward displacement to receive the remaining powder conveyed by the conveyor track 21 and reflux it into the powder box 2. On the left side inside the conveyor track 21, there is a driving rod one 8 rotatably connected. On the right side inside the conveyor track 21, there is a driving rod two 10 rotatably connected. The front and rear ends of the driving rod one 8 and the driving rod two 10 are rotatably connected to the inner wall of the powder box 2. The front and rear ends of the driving rod one 8 pass through the powder box 2 and are fixedly connected with a driving gear two 12. The top of the driving gear two 12 is meshed with the bottom end of the fixed rack 11. The front and rear of the driving gear two 12 are fixedly connected with a sector gear 13. The left ends of the sector gears 13 are meshed with a toothed plate 14; The bottom ends of the toothed plates 14 are fixedly connected with the right ends of the pressure plate 15. The top of the toothed plate 14 is provided with a telescopic movable rod 16. The bottom end of the inner rod of the telescopic movable rod 16 is fixedly connected with the top of the toothed plate 14. The top end of the outer rod of the telescopic movable rod 16 is fixedly connected with the surface of the powder box 2. A torsion spring one 17 is sleeved on the inner rod of the telescopic movable rod 16. One end of the torsion spring one 17 is fixedly connected with the inner rod of the telescopic movable rod 16, and the other end of the torsion spring one 17 is fixedly connected with the outer rod of the telescopic movable rod 16; The mutually close ends of the toothed plates 14 are fixedly connected with sliding rods 19. The sliding rods 19 are all slidably connected with the surface of the powder box 2. The mutually close ends of the sliding rods 19 are all fixedly connected with the surface of the cover plate 18; The front and rear ends of the shaft rod 4 are rotatably connected to the inner wall of the powder box 2. The front end of the shaft rod 4 passes through the powder box 2 and is fixedly connected with a driving gear one 9. The bottom ends of the left and right sides of the fixed rack 11 are fixedly connected with the top of the support main board 1. The bottom of the driving gear one 9 is meshed with the top of the fixed rack 11; At the top of the cover plate 18, torsion springs II 20 are evenly arranged. The tops of the torsion springs II 20 are fixedly connected to the inner wall of the powder box 2, and the bottoms of the torsion springs II 20 are fixedly connected to the top of the cover plate 18.

[0022] Compared with the prior art, it can efficiently adsorb the remaining powder left on the top of the support main board 1, avoid the accumulation of the remaining powder affecting the operation of the equipment, improve the cleaning efficiency of the equipment at the same time, scrape and convey the adsorbed remaining powder into the interior of the powder box 2, realize the automatic recovery and recycling of the remaining powder, reduce the waste of raw materials, improve the production cost benefit, and form an efficient and automated powder cleaning and recovery system through the rotation action of the magnetic guide plate 7 and the synchronously triggered electromagnetic force mechanism, combined with the adsorption, scraping and reflux mechanisms of the remaining powder.

[0023] Embodiment 2: On other levels, this embodiment also provides another optimization mechanism based on Embodiment 1, specifically a forming method of a VVT sprocket by powder metallurgy, including the following steps: Step 1: Check the energized state of the coil 6 and the magnetic force generation state on the surfaces of the magnetic conductor 5 and the magnetic guide plate 7, and make the cover plate 18 in the initial low-position standby state; the magnetic conductor 5 in Step 1 is an axially extending magnetic conductive rod body, and its outer surface is provided with spiral guide grooves. The coil 6 is a segmented conductive ring nested in the spiral guide grooves, and adjacent conductive rings are separated by insulating gaps. The coil 6 receives power supply from a preset fixed power supply module and forms an intermittent energized circuit, so that the magnetic conductor 5 generates an axial gradient magnetic field and drives the corresponding magnetic guide plate 7 to generate magnetic force; Step 2: Deploy a traction device at the powder box 2, inject metallurgical powder into the left powder box 2, start the traction device to pull the powder box 2 to move rightward, and displace it to the mold box 3, so that the metallurgical powder is injected into the mold box 3. During the displacement of the powder box 2, the pressing plate 15 performs a powder density cyclic homogenization and flattening process on the metallurgical powder filled inside the mold box 3; Step 3: When the traction device resets, the powder box 2 is in the return state, the shaft rod 4 is in the rotating state, and several coils 6 on the side far from the conveyor track 21 are energized, and the associated magnetic guide plates 7 generate magnetic force to adsorb the metallurgical powder left on the surface of the support main board 1. When the magnetic guide plate 7 switches to the vicinity of the conveyor track 21, the coil 6 is de-energized, and the associated magnetic guide plate 7 is demagnetized; on the surface of the shaft rod 4 in Step 3, four groups of magnetic guide plates 7 are evenly deployed, and the number of each group of magnetic guide plates 7 is not less than three. When the shaft rod 4 is in the rotating state, only one group of magnetic guide plates 7 on the side close to the conveyor track 21 is in the de-energized state; Step 4: The conveyor track 21 scrapes and conveys the powder collected by the magnetic guide plate 7, and the cover plate 18 is in a continuously opening and closing state to re-inject the metallurgical powder into the cavity of the powder box 2; Step 5: After the powder box 2 is completely reset, the coil 6 is powered off, the magnetic guide plate 7 is demagnetized, and all moving parts are reset to the initial working position.

[0024] Compared with the prior art, by utilizing axial gradient magnetic field and segmented conductive ring control, combined with traction equipment, magnetic adsorption device and powder density cyclic uniform flattening treatment, the full-process automation of efficient injection, density uniformization and powder recovery of metallurgical powder is realized. This method improves the uniformity and compactness of powder filling, reduces powder waste, optimizes the forming efficiency, realizes the intelligent operation of the equipment, and reduces the energy consumption and the need for manual intervention.

[0025] Working principle: Before the specific implementation of the forming equipment in the present invention, as Figure 1 and Figure 5 shown, it is necessary to install traction equipment, such as an electric telescopic rod, on the left side of the powder box 2, deploy powder injection equipment at the top of the powder box 2 to regularly inject metallurgical powder, and deploy pressing equipment at the top of the mold box 3. When the metallurgical powder is injected into the powder box 2, the traction equipment starts, causing the powder box 2 to displace on the surface of the support main board 1. When it displaces to the top of the mold box 3, the metallurgical powder inside the powder box 2 falls into the mold box 3. When the traction equipment resets, it drives the powder box 2 to return; During the return process of the powder box 2, due to the meshing state of the first transmission gear 9 and the fixed rack 11, the first transmission gear 9 is in a rotating state at this time. The first transmission gear 9 drives the shaft rod 4 to rotate. At this time, the coil 6 is energized, and magnetic force is generated on the surfaces of the magnetic conductor 5 and the magnetic guide plate 7 to adsorb the metallurgical powder scattered on the top of the support main board 1. With the rotation of the shaft rod 4 driving the magnetic guide plate 7, when a certain group of magnetic guide plates 7 moves above the conveyor track 21, the coil 6 corresponding to this group of magnetic guide plates 7 is de-energized. At this time, the magnetic force on the surface of this group of magnetic guide plates 7 is released. With the rotation of the magnetic guide plate 7, the conveyor track 21 scrapes off the metallurgical powder adsorbed on the surface of the magnetic guide plate 7; At the same time, as Figure 2 shown, since the second transmission gear 12 is also in a meshing state with the fixed rack 11, the second transmission gear 12 rotates synchronously with the movement of the powder box 2, as Figure 8As shown, the transmission gear two 12 drives the rotation of the transmission rod one 8. With the cooperation of the transmission rod two 10, the conveyor track 21 rotates synchronously, conveying the scraped metallurgical powder towards the cover plate 18. During the operation of the transmission gear two 12, the sector gear 13 is driven to rotate synchronously. The partial tooth blocks on the surface of the sector gear 13 engage and drive the surface of the toothed plate 14. Under the thrust of the sector gear 13, the toothed plate 14 drives the inner rod of the telescopic movable rod 16 to move out of the outer rod of the telescopic movable rod 16, and the torsion spring one 17 is driven by the telescopic movable rod 16 to be stretched. When the tooth blocks of the sector gear 13 move out of the toothed plate 14, at this time, under the action of the elastic force, the torsion spring one 17 rebounds and resets, driving the toothed plate 14 to reset. During this process, the toothed plate 14 drives the pressing plate 15 to reciprocally press against the surface of the support main board 1. When passing through the powder injection area on the surface of the mold box 3, the pressing plate 15 fully presses the powder injection; During the reciprocating movement of the toothed plate 14, the slide rod 19 is driven to reciprocate, and the cover plate 18 is driven to reciprocate. The cover plate 18 drives the torsion spring two 20 to be reciprocally stretched. The cover plate 18 reciprocally opens the powder box 2. At this time, the metallurgical powder conveyed by the conveyor track 21 re-enters the interior of the powder box 2 when the cover plate 18 is in the open state. When the powder box 2 resets, the pressing equipment deployed above the mold box 3 starts to press towards the mold box 3 to complete the forming.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A forming auxiliary device for a VVT sprocket made of powder metallurgy, characterized in that, It includes a supporting main board (1). On the left side of the top of the supporting main board (1), there is a powder box (2). On the right side of the top of the supporting main board (1), there is a mold box (3) opened. On the right end of the powder box (2), there is a shaft rod (4). On the surface of the shaft rod (4), four magnetic guide plates (7) are evenly arranged. A pressing plate (15) is sleeved on the surface of the powder box (2). On the front and back sides of the top of the supporting main board (1), there are fixed racks (11). The magnetic guide plates (7) are used to continuously rotate during the movement of the powder box (2), and synchronously trigger an energization action to generate magnetism, and adsorb and collect the remaining powder left on the top of the supporting main board (1). On the right side of the powder box (2), there is a conveyor belt (21). The conveyor belt (21) is used to scrape the remaining powder adsorbed on the surface of the magnetic guide plates (7), and convey the remaining powder to the powder box (2) along with the rotation action of the shaft rod (4). On the right side of the supporting main board (1), there is a cover plate (18) slidably connected. The cover plate (18) is used to be triggered when the conveyor belt (21) is in the conveying state, and perform cyclic upward and downward displacement to receive the remaining powder conveyed by the conveyor belt (21) and reflux and inject it into the powder box (2).

2. The forming auxiliary device for a VVT sprocket made of powder metallurgy according to claim 1, characterized in that, Magnetic conductors (5) are evenly fixedly connected to the surface of the magnetic guide plates (7). Coils (6) are sleeved on the surfaces of the magnetic conductors (5). When the coils (6) are powered on, the magnetic conductors (5) and the magnetic guide plates (7) generate magnetism.

3. The forming auxiliary equipment for a VVT sprocket powder metallurgy according to claim 1, characterized in that, Both the front and rear ends of the shaft rod (4) are rotatably connected to the inner wall of the powder box (2). The front end of the shaft rod (4) passes through the powder box (2) and is fixedly connected with a first transmission gear (9). The bottom ends on the left and right sides of the fixed rack (11) are fixedly connected to the top of the supporting main board (1). The bottom end of the first transmission gear (9) is meshed with the top of the fixed rack (11).

4. A forming auxiliary device for a VVT sprocket powder metallurgy according to claim 1, characterized in that, On the left side inside the conveyor belt (21), there is a first transmission rod (8) rotatably connected. On the right side inside the conveyor belt (21), there is a second transmission rod (10) rotatably connected. Both the front and rear ends of the first transmission rod (8) and the second transmission rod (10) are rotatably connected to the inner wall of the powder box (2). Both the front and rear ends of the first transmission rod (8) pass through the powder box (2) and are fixedly connected with second transmission gears (12). The top ends of the second transmission gears (12) are meshed with the bottom ends of the fixed racks (11). Sector gears (13) are fixedly connected to the front and rear of the second transmission gears (12). Tooth plates (14) are meshed with the left ends of the sector gears (13).

5. An auxiliary forming device for powder metallurgy of a VVT sprocket according to claim 4, characterized in that, The bottom ends of the toothed plates (14) are fixedly connected to the right end of the pressing plate (15). The top ends of the toothed plates (14) are provided with telescopic movable rods (16). The bottom end of the inner rod of the telescopic movable rod (16) is fixedly connected to the top end of the toothed plate (14). The top end of the outer rod of the telescopic movable rod (16) is fixedly connected to the surface of the powder box (2). A first torsion spring (17) is sleeved on the inner rod of the telescopic movable rod (16). One end of the first torsion spring (17) is fixedly connected to the inner rod of the telescopic movable rod (16), and the other end of the first torsion spring (17) is fixedly connected to the outer rod of the telescopic movable rod (16).

6. The forming auxiliary equipment for a VVT sprocket powder metallurgy according to claim 5, characterized in that, The ends of the toothed plates (14) close to each other are fixedly connected with sliding rods (19). The sliding rods (19) are all slidably connected to the surface of the powder box (2). The ends of the sliding rods (19) close to each other are fixedly connected to the surface of the cover plate (18).

7. An auxiliary forming device for a VVT sprocket powder metallurgy according to claim 1, characterized in that, The top end of the cover plate (18) is evenly provided with second torsion springs (20). The top ends of the second torsion springs (20) are all fixedly connected to the inner wall of the powder box (2), and the bottom ends of the second torsion springs (20) are all fixedly connected to the top end of the cover plate (18).

8. A VVT sprocket powder metallurgy forming method for the forming auxiliary equipment of the VVT sprocket powder metallurgy according to any one of claims 1-7, characterized in that, It includes the following steps: Step 1: Check the energized state of the coil (6) and the magnetic force generation state on the surfaces of the magnetic conductor (5) and the magnetic guide plate (7), so that the cover plate (18) is in the initial low-position standby state; Step 2: Deploy a traction device at the powder box (2), inject metallurgical powder into the left powder box (2), start the traction device to pull the powder box (2) to move rightward, and displace it to the mold box (3), so that the metallurgical powder is injected into the mold box (3). During the displacement of the powder box (2), the pressing plate (15) performs a powder density cyclic homogenization and flattening process on the metallurgical powder filled inside the mold box (3). Step 3: When the traction device resets, the powder box (2) is in the return state, the shaft rod (4) is in the rotating state, several coils (6) on the side away from the conveyor track (21) are energized, and the associated magnetic guide plates (7) generate magnetic force to adsorb and support the metallurgical powder omitted on the surface of the main board (1). When the magnetic guide plate (7) switches to near the conveyor track (21), the coil (6) is de-energized, and the associated magnetic guide plate (7) releases the magnetic force. Step 4: The conveyor track (21) scrapes and conveys the powder collected by the magnetic guide plate (7), and the cover plate (18) is in a continuously opening and closing state to re-inject the metallurgical powder into the cavity of the powder box (2). Step 5: After the powder box (2) is completely reset, the coil (6) is powered off, the magnetic guide plate (7) is demagnetized, and all moving parts are reset to the initial working position.

9. The forming method of the VVT sprocket powder metallurgy according to claim 8, characterized in that, The magnetic conductor (5) in the above Step 1 is an axially extending magnetically conductive rod body, and its outer surface is provided with spiral guide grooves. The coil (6) is a segmented conductive ring nested in the spiral guide grooves, and adjacent conductive rings are separated by an insulating gap. The coil (6) receives power supply from a preset fixed power supply module and forms an intermittent power-on circuit, so that the magnetic conductor (5) generates an axial gradient magnetic field and drives the corresponding magnetic guide plate (7) to generate magnetic force.

10. The forming method of the VVT sprocket powder metallurgy according to claim 8, characterized in that, Four groups of magnetic conduction plates (7) are evenly deployed on the surface of the shaft rod (4) in the step 3. The number of each group of magnetic conduction plates (7) is not less than three. When the shaft rod (4) is in a rotating state, only one group of magnetic conduction plates (7) on the side close to the conveyor track (21) is in a de-energized state.

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