A powder metallurgy forming machine for automobile spiral gear with anti-sticking die

Abstract

The application discloses a powder metallurgy forming machine for preventing automobile spiral gear from sticking to a die, and relates to the field of powder metallurgy.The powder metallurgy forming machine for preventing automobile spiral gear from sticking to a die can clean residual powder on the spiral protrusion surface of a compression column in real time during the rotation and compression of the compression column through the steel brush ring installed on the conical surface of the outer column, so that the powder accumulation and sticking of the compression structure are avoided; meanwhile, the steel brush cylinder installed on the bottom of the material ejecting disc can reciprocatingly ascend and descend with the material ejecting mechanism, so that the residual powder in the dead angle between the spiral tooth groove of the die cavity disc and the outer side of the inner die rod is cleaned in all directions, the whole process of forming and demolding is synchronously cleaned, manual shutdown and die cleaning are not needed, and the defects of gear burrs and tooth shape deviation caused by the dry sticking of the powder to the die are avoided.

Description

Technical Field

[0001] This invention specifically relates to an anti-sticking powder metallurgy molding machine for automotive helical gears, and pertains to the field of powder metallurgy. Background Technology

[0002] With its advantages of high precision, low loss, and near-net-shape forming, powder metallurgy has become the core process for mass production of automotive helical gears. Compared with traditional cutting, it can effectively reduce material waste, improve gear size consistency, and meet the production needs of precision gears in automotive transmission systems. Automotive helical gears have a special structure with helical curved tooth profiles and fine and complex cavity grooves. During the powder metallurgy pressing process, the mold cavity and metal powder have a large frictional contact area, which can easily lead to powder residue and sticking to the mold.

[0003] A powder forming machine with publication number CN110328362B includes a base, a forming machine mold frame mechanism, a feeding mechanism, and a discharging mechanism. The forming machine mold frame mechanism is mounted on the base and includes a mold frame, an upper mold assembly, and a lower mold assembly. The upper mold assembly and the lower mold assembly are symmetrically arranged within the mold frame. The lower mold assembly has a forming cavity. The upper mold assembly is used to compress powder accumulated in the forming cavity to form the powder into a preset shape. The feeding mechanism is used to transport powder into the forming cavity. The discharging mechanism is used to output the formed product. The beneficial effects of this invention are: this powder forming machine can realize automated powder forming, greatly improving production efficiency while ensuring product quality;

[0004] In existing equipment, traditional molding dies lack dedicated cleaning structures, making it difficult to clean residual powder in the dead corners of the spiral tooth grooves. Over time, this leads to powder drying and sticking to the mold, resulting in quality defects such as burrs, missing material, and tooth deformation in the molded gear blanks. This significantly reduces the product qualification rate and accelerates mold wear, shortening the mold's service life. Summary of the Invention

[0005] To address the aforementioned problems, a technical solution is proposed: an anti-sticking powder metallurgy molding machine for automotive helical gears, comprising:

[0006] The frame has a forming mechanism installed on its top and a mold mechanism installed inside the frame. The mold mechanism is located directly below the frame and a pushing mechanism is installed on its top.

[0007] The molding mechanism includes a top plate with a circular groove at its center. A cavity plate is fixedly installed in the groove. The inner wall of the cavity plate has evenly distributed spiral grooves and spiral toothed grooves. Support columns are fixedly installed at the corners of the bottom of the top plate. A bottom plate is fixedly installed at the bottom of each support column. A bottom support frame is fixedly installed at the bottom of the bottom plate. An outer cover is fixedly installed at the bottom of the top plate. A steel brush ring installed on the conical surface of the outer cover can clean residual powder on the surface of the spiral protrusions of the molding column in real time during the rotation and pressing process, preventing powder accumulation and adhesion in the molding structure. Simultaneously, the bottom of the top plate is rotatably mounted... The steel brush cylinder can reciprocate and rise with the ejector mechanism to thoroughly clean the dead corners of the cavity plate's spiral tooth grooves and the outer side of the inner mold rod, achieving synchronous cleaning throughout the molding and demolding process. This eliminates the need for manual shutdown to clean the mold and avoids defects such as gear burrs and tooth shape deviations caused by powder drying and sticking to the mold. The inner wall of the outer cover cylinder is slidably installed with an ejector plate, and the outer side of the ejector plate is evenly provided with protruding teeth. The protruding teeth of the ejector plate are adapted to the spiral tooth grooves of the cavity plate. The bottom of the ejector plate is rotatably installed with a steel brush cylinder, and the outer side of the steel brush cylinder is evenly provided with steel bristles. The center position of the top of the bottom support frame is fixedly installed with an inner mold rod, and the top of the inner mold rod is flush with the top of the cavity plate.

[0008] Preferably, connecting blocks are fixedly installed on both sides of the base plate, and the base plate is fixedly connected to the inner wall of the frame through the connecting blocks. The inner wall of the steel brush cylinder and the inner molded rod are slidably adapted. A top plate is fixedly installed at the bottom of the steel brush cylinder. An outer retaining ring is fixedly installed on the outer side of the outer cover cylinder. The bottom of the outer retaining ring is fixedly connected to the top of the base plate. An inner retaining ring is fixedly installed on the inner wall of the outer cover cylinder. The bottom edge of the top plate fits against the top of the inner retaining ring. A base plate is slidably installed at the bottom of the inner wall of the outer cover cylinder. A spring is fixedly installed between the base plate and the top plate. Through the demolding structure driven by the ejector cylinder, precisely guided by the guide column, and elastically buffered by the spring, the ejector plate rises and falls smoothly along the spiral tooth groove trajectory of the cavity plate. The ejection process is the same as... With high axiality and strong stability, it avoids the problems of scratches, deformation and tooth breakage of gear blanks caused by traditional hard ejection. At the same time, the outer ring slides in close contact with the inner mold bar, which can isolate powder and prevent the moving structure from jamming, ensuring a smooth demolding process and improving the appearance and dimensional accuracy of the finished product. The bottom of the top plate is fixedly installed with guide columns, which are evenly installed along the center position at the bottom of the top plate, and the bottom of the guide columns penetrates the bottom plate and extends to its bottom. The bottom of the bottom support frame is fixedly installed with ejector cylinders on both sides. The output end of the ejector cylinder penetrates the bottom support frame and is fixedly connected to the bottom of the bottom plate. The bottom of the guide column is fixedly connected with an outer ring, and the inner wall of the outer ring is in close contact with the outer side of the inner mold bar.

[0009] Preferably, the feeding mechanism includes a baffle frame, which is fixedly installed on the top of the top plate. A cylinder is fixedly installed on the outer side of the baffle frame. The cylinder is symmetrically installed along the center of the axis of the baffle frame. The output end of the cylinder passes through the baffle frame and extends into it. A powder frame is slidably installed on the inner wall of the baffle frame. The output end of the cylinder is fixedly connected to the outer side of the powder frame. The bottom of the powder frame is in contact with the top of the top plate. A top cover plate is fixedly installed on the top of the powder frame. A rectangular groove is formed on the top of the top cover plate. A feeding cover is fixedly installed at the rectangular groove on the top of the top cover plate. An inner guide plate is fixedly installed on the inner wall of the powder frame away from the cylinder. The side of the inner guide plate near the cylinder is a concave arc at the center. The inner guide plate has a pusher plate fixedly installed on the other side. The pusher plate has a sloping surface with a central depression on the side away from the inner guide plate. A sieve plate is fixedly installed on the inner wall of the powder frame. The top of the sieve plate has evenly distributed perforated sieve holes. The sieve plate is inclined inside the powder frame, and the end of the sieve plate near the inner guide plate is inclined upward. Through the inclined sieve plate, the metallurgical powder can be automatically sieved, filtering out lumps and large particles of impurities. Only qualified fine powder enters the molding cavity, avoiding molding defects from the source. At the same time, in conjunction with the guiding structure of the inner guide plate arc surface and the pusher plate sloping surface, the powder distribution can be evenly and regularly arranged, avoiding powder accumulation and overflow problems, reducing raw material waste, and ensuring the consistency of raw materials for each pressing and molding.

[0010] Preferably, the forming mechanism includes a support plate, which is fixedly installed on the top of the frame. A pressing cylinder is fixedly installed at the center of the top of the support plate. The output end of the pressing cylinder passes through the support plate and extends to its bottom. An outer column is fixedly installed at the bottom of the support plate. The inner wall of the outer column is uniformly provided with spiral grooves. A forming column is slidably installed on the inner wall of the outer column. Spiral protrusions are uniformly provided on the outer side of the forming column, and the spiral protrusions of the forming column are adapted to the spiral grooves of the cavity plate. A turntable is rotatably installed on the top of the forming column, and the top of the turntable is fixedly connected to the output end of the pressing cylinder. By precisely matching the spiral protrusions on the outer side of the forming column with the spiral tooth grooves of the cavity disk, and with the guidance of the spiral grooves of the outer column, the forming column rotates synchronously during the pressing process, realizing the spin forming composite molding of the spiral gear. Compared with the traditional vertical stamping method, it can make the metal powder uniformly filled and densely compacted inside the cavity, avoiding the problems of local looseness and uneven density. It accurately replicates the curved tooth structure of the spiral gear, with high forming accuracy and good blank structure stability. The bottom of the inner wall of the outer column is a tapered surface with the inner diameter gradually increasing from top to bottom, and a steel brush ring is fixedly installed at the tapered surface of the outer column. The inner wall of the steel brush ring is uniformly provided with steel brush bristles.

[0011] This invention provides an anti-sticking powder metallurgy molding machine for automotive helical gears, which has the following beneficial effects:

[0012] (i) The steel brush ring installed on the conical surface of the outer column can clean the residual powder on the surface of the spiral protrusion of the forming column in real time during the rotation and pressing of the forming column, so as to avoid the accumulation and adhesion of powder in the forming structure. At the same time, the steel brush cylinder installed at the bottom of the top plate can move up and down with the top material mechanism to clean the residual powder in the dead corners of the spiral tooth groove of the cavity plate and the outer side of the inner mold rod in all directions. This achieves synchronous cleaning throughout the forming and demolding process, eliminating the need for manual shutdown to clean the mold and avoiding defects such as gear burrs and tooth deviation caused by powder drying and sticking to the mold.

[0013] (ii) The demolding structure, driven by the ejector cylinder, precisely guided by the guide column and buffered by the spring, allows the ejector plate to rise and fall smoothly along the spiral tooth groove of the cavity plate. The ejection process has high coaxiality and strong stability, which can avoid the problems of scratches, deformation and tooth breakage of the gear blank caused by traditional hard ejection. At the same time, the outer ring slides in close contact with the inner mold bar, which can isolate the powder and prevent the moving structure from jamming, ensuring a smooth demolding process and improving the appearance and dimensional accuracy of the finished product.

[0014] (III) The inclined sieve plate can automatically screen the metallurgical powder, filter out agglomerates and large particles of impurities, and only qualified fine powder enters the molding cavity, thus avoiding molding defects from the source. At the same time, the flow guiding structure of the inner guide plate arc surface and the pusher plate inclined surface can evenly and regularly distribute the powder, avoid powder accumulation and overflow, reduce raw material waste, and ensure the consistency of raw materials for each pressing and molding.

[0015] (iv) By precisely matching the spiral protrusions on the outer side of the forming column with the spiral tooth grooves of the cavity plate, and with the guidance of the spiral grooves of the outer column, the forming column rotates synchronously during the pressing process, realizing the spin forming composite molding of the spiral gear. Compared with the traditional vertical stamping method, it can make the metal powder uniformly filled and densely compacted inside the cavity, avoiding the problems of local looseness and uneven density, accurately replicating the curved tooth structure of the spiral gear, with high forming accuracy and good stability of the blank structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the mold mechanism and the material ejection mechanism of the present invention;

[0018] Figure 3 This is a schematic diagram of the mold mechanism of the present invention;

[0019] Figure 4 This is a sectional view of the mold mechanism of the present invention;

[0020] Figure 5 This is a partial sectional view of the mold mechanism of the present invention;

[0021] Figure 6 This is a schematic diagram of the feeding mechanism of the present invention;

[0022] Figure 7 This is a partial sectional view of the feeding mechanism of the present invention;

[0023] Figure 8 This is a schematic diagram of the forming mechanism of the present invention;

[0024] Figure 9 This is a sectional view of the forming mechanism of the present invention;

[0025] Figure 10 This is a bottom view of the structural cross-section of the forming mechanism of the present invention.

[0026] In the diagram: 1. Frame; 2. Forming mechanism; 3. Mold mechanism; 4. Pushing mechanism; 21. Support plate; 22. Pressing cylinder; 23. Outer column; 24. Forming column; 25. Turntable; 26. Steel brush ring; 31. Support column; 32. Top plate; 33. Bottom plate; 34. Ejector plate; 35. Connecting block; 36. Cavity plate; 37. Inner mold rod; 38. Outer cover; 39. 310. Bottom support frame; 311. Top material cylinder; 312. Steel brush cylinder; 313. Top plate; 314. Outer retaining ring; 315. Spring; 316. Guide column; 317. Outer retaining ring; 318. Inner retaining ring; 319. Chassis; 41. Material blocking frame; 42. Cylinder; 43. Top cover plate; 44. Pusher plate; 45. Powder frame; 46. Feeding hood; 47. Inner guide plate; 48. Screening plate. Detailed Implementation

[0027] Example 1, Reference Figures 1 to 5 The present invention provides the following technical solution:

[0028] A powder metallurgical molding machine for anti-sticking of automotive helical gears, comprising:

[0029] The frame 1 has a forming mechanism 2 installed on its top and a mold mechanism 3 installed inside the frame 1. The mold mechanism 3 is located directly below the frame 1 and a pushing mechanism 4 is installed on its top.

[0030] The mold mechanism 3 includes a top plate 32, with a circular groove at the center of the top of the top plate 32. A cavity plate 36 is fixedly installed at the circular groove of the top plate 32. The inner wall of the cavity plate 36 is uniformly provided with spiral grooves and spiral tooth grooves. Support columns 31 are fixedly installed at the bottom corners of the top plate 32. A bottom plate 33 is fixedly installed at the bottom end of the support columns 31. A bottom support frame 39 is fixedly installed at the bottom of the bottom plate 33. An outer cover 38 is fixedly installed at the bottom of the top plate 32. An ejector plate 34 is slidably installed on the inner wall of the outer cover 38. After the gear blank is pressed and formed, the pressure cylinder 22 retracts, driving the pressure column 24 to rotate and reset and rise to its original position, separating it from the forming area of ​​the cavity plate 36. The demolding and ejection mechanism starts operation. The ejector cylinders 310 on both sides of the bottom of the bottom support frame 39 extend synchronously, and the output end pushes the base plate 318 to slide upward along the inner wall of the outer cover 38. The base plate 318 is pushed upward by the spring 31. 4. The top plate 312 moves upward, driving the top-fixed steel brush cylinder 311 and the ejector plate 34 to move upward synchronously. The outer protruding teeth of the ejector plate 34 are adapted to the helical tooth groove of the cavity plate 36, and move smoothly upward along the tooth groove trajectory, ejecting the helical gear blank formed between the cavity plate 36 and the inner mold rod 37 out of the mold cavity as a whole, completing the demolding of the workpiece. During the ejection process, the guide pillars 315 evenly distributed at the bottom of the top plate 312 slide through the base plate 318. To ensure the vertical and stable lifting of the top plate 34, and to prevent the gear blank from being ejected off-center and deformed, the outer side of the top plate 34 is evenly provided with protruding teeth. The protruding teeth of the top plate 34 are adapted to the spiral tooth groove of the cavity plate 36. A steel brush cylinder 311 is rotatably installed at the bottom of the top plate 34. The outer side of the steel brush cylinder 311 is evenly provided with steel brush bristles. An inner mold rod 37 is fixedly installed at the center of the top of the bottom support frame 39. The top of the inner mold rod 37 is flush with the top of the cavity plate 36.

[0031] Connecting blocks 35 are fixedly installed on both sides of the base plate 33. The base plate 33 is fixedly connected to the inner wall of the frame 1 through the connecting blocks 35. The inner wall of the steel brush cylinder 311 and the top plate 34 slides and adapts to the outer side of the inner shape bar 37. The bottom of the steel brush cylinder 311 is fixedly installed with a top plate 312. The outer cover cylinder 38 is fixedly installed with an outer retaining ring 313. The bottom of the outer retaining ring 313 is fixedly connected to the top of the base plate 33. The outer sleeve ring 316 at the bottom of the guide column 315 slides against the outer side of the inner shape bar 37. The ejection process improves coaxiality while isolating powder and preventing guide structure jamming. The inner retaining ring 317 on the inner wall of the outer casing 38 provides initial positioning for the top plate 312. The outer retaining ring 313 provides fixed support to the outer casing 38, ensuring the stability of the ejection operation. After the workpiece is demolded and removed, the ejector cylinder 310 slowly retracts, causing the base plate 318 to move downwards. The spring 314 resets, and the top plate 312, steel brush cylinder 311, and ejector plate 34 simultaneously descend and reset. The inner retaining ring 317 is fixedly installed on the inner wall of the outer casing 38. 17. The bottom edge of the top plate 312 is fitted with the top of the inner retaining ring 317. The bottom of the inner wall of the outer cover 38 is slidably mounted on the base plate 318. A spring 314 is fixedly installed between the base plate 318 and the top plate 312. A guide post 315 is fixedly installed on the bottom of the top plate 312. The guide posts 315 are evenly installed along the center position at the bottom of the top plate 312, and the bottom of the guide posts 315 penetrates through the base plate 318 and extends to its bottom. Top materials are fixedly installed on both sides of the bottom of the bottom support frame 39. During the lifting and reciprocating motion of the hydraulic cylinder 310, the steel brush bristles on the outer side of the steel brush cylinder 311 continuously adhere to the outer side of the inner rod 37 and the spiral tooth grooves on the inner wall of the cavity plate 36 for all-round cleaning, thoroughly removing the fine metallurgical powder residue on the inner wall of the mold, effectively preventing the powder from drying and sticking to the mold, solving the problem of cleaning the dead corners of the spiral tooth grooves, and achieving mold anti-stick protection. The cylinder 42 of the pushing mechanism 4 can extend and retract as needed, driving the powder frame 45 to slide along the inner wall of the baffle frame 41, adjusting the feeding position, and cleaning the residual powder in the frame. The mold mechanism 3 is fixed to the inner wall of the frame 1 by the support column 31, the base plate 33 and the connecting block 35, maintaining structural stability throughout the process. After all mechanisms are fully reset, the equipment enters the standby state, waiting for the next round of molding operation. The output end of the top material cylinder 310 passes through the bottom support frame 39, and the output end of the top material cylinder 310 is fixedly connected to the bottom of the chassis 318. The bottom of the guide column 315 is fixedly connected to the outer ring 316, and the inner wall of the outer ring 316 is in contact with the outer side of the inner mold rod 37.

[0032] Example 2, based on Example 1, with reference to Figures 6 to 7The feeding mechanism 4 includes a baffle frame 41, which is fixedly installed on the top of the top plate 32. A cylinder 42 is fixedly installed on the outer side of the baffle frame 41. The cylinder 42 is symmetrically installed along the center of the axis of the baffle frame 41. The output end of the cylinder 42 passes through the baffle frame 41 and extends into it. A powder frame 45 is slidably installed on the inner wall of the baffle frame 41. The output end of the cylinder 42 is fixedly connected to the outer side of the powder frame 45. The bottom of the powder frame 45 is in contact with the top of the top plate 32. A top cover plate 43 is fixedly installed on the top of the powder frame 45. A rectangular groove is provided, and a feeding hood 46 is fixedly installed at the rectangular groove on the top of the top cover plate 43. In the pushing mechanism 4, the entire pushing mechanism 4 is mounted on the top plate 32 of the mold mechanism 3, serving as a supply and screening unit for the forming powder. The operator feeds the metallurgical forming powder through the feeding hood 46. The powder falls into the powder frame 45 through the rectangular groove of the top cover plate 43. At this time, the cylinders 42, which are symmetrically installed on the outside of the baffle frame 41, are in a retracted state. The powder frame 45 remains stationary against the top plate 32. After the powder falls in, it passes through the inclined screening plate 48 inside the powder frame 45. The perforated sieve holes at the top of the sieve plate 48 complete the powder screening, removing lumps and large particles of impurities. Only qualified fine powder falls into the forming area of ​​the lower cavity plate 36. The upward tilting structure of the sieve plate 48 near the inner guide plate 47 can prevent powder accumulation. The inner guide plate 47 is fixedly installed on the inner wall of the powder frame 45 at the end away from the cylinder 42. The side of the inner guide plate 47 near the cylinder 42 is a concave arc surface at the center, and the other side of the inner guide plate 47 is fixedly installed with a pusher plate 44. The side of the pusher plate 44 away from the inner guide plate 47 is a concave inclined surface at the center. A sieve plate 48 is fixedly installed on the inner wall of the frame 45. The top of the sieve plate 48 is evenly provided with hollow sieve holes. The arc structure of the inner guide plate 47 and the inclined structure of the pusher plate 44 can guide and regulate the powder, ensuring that the powder is evenly filled into the forming cavity between the spiral tooth groove of the cavity plate 36 and the inner mold rod 37, providing uniform and pure powder raw materials for subsequent pressing operations. The baffle frame 41 plays a limiting and protective role throughout the process to prevent powder from overflowing. The sieve plate 48 is inclined inside the powder frame 45, and the end of the sieve plate 48 near the inner guide plate 47 is inclined upward.

[0033] Example 3, based on Examples 1 and 2, with reference to Figures 8 to 10The forming mechanism 2 includes a support plate 21, which is fixedly installed on the top of the frame 1. A pressing cylinder 22 is fixedly installed at the center of the top of the support plate 21. The output end of the pressing cylinder 22 passes through the support plate 21 and extends to its bottom. The pressing cylinder 22 at the top of the support plate 21 extends out and drives the turntable 25 fixed at the bottom to move down, which drives the forming column 24, which is rotatably connected to the turntable 25, to slide down vertically along the inner wall of the outer column cylinder 23. The spiral groove opened on the inner wall of the outer column cylinder 23 is adapted to the spiral protrusion on the outer side of the forming column 24. The forming column 24 rotates synchronously during the pressing process to realize the combined motion of rotation and pressing. The spiral protrusions of the forming column 24 precisely correspond to the spiral grooves on the inner wall of the cavity disk 36. Together with the inner forming rod 37 at the center of the cavity disk 36, they extrude and spin-form the filled metallurgical powder, precisely replicating the inner and outer contours of the spiral gear. An outer column 23 is fixedly installed at the bottom of the support plate 21. Spiral grooves are evenly distributed on the inner wall of the outer column 23. A forming column 24 is slidably installed on the inner wall of the outer column 23. Spiral protrusions are evenly distributed on the outer side of the forming column 24, and these protrusions are matched with the spiral grooves of the cavity disk 36. A turntable 25 is rotatably installed on the top of the forming column 24. During the pressing operation, the outer column... The steel brush ring 26 installed on the bottom conical surface of the outer column 23 has steel brush bristles that continuously adhere to the spiral protrusions on the outer side of the forming column 24, cleaning the fine powder adhering to the surface of the forming column 24 during the pressing process in real time, avoiding powder adhesion that could cause defects in gear forming, and achieving synchronous anti-sticking cleaning during the forming process. After pressing to the set stroke, the pressing cylinder 22 pauses to maintain pressure, ensuring that the gear blank is densely formed. The top of the turntable 25 is fixedly connected to the output end of the pressing cylinder 22. The bottom of the inner wall of the outer column 23 is a conical surface with an inner diameter that gradually increases from top to bottom, and a steel brush ring 26 is fixedly installed on the conical surface of the outer column 23. The inner wall of the steel brush ring 26 is evenly provided with steel brush bristles.

[0034] In the feeding mechanism 4, the feeding mechanism 4 is mounted on the top plate 32 of the mold mechanism 3. It serves as the supply and screening unit for the forming powder. The operator feeds the metallurgical forming powder into the feeding hood 46. The powder falls into the powder frame 45 through the rectangular groove of the top cover plate 43. At this time, the cylinders 42, which are symmetrically installed on the outside of the baffle frame 41, are in a retracted state. The powder frame 45 remains stationary against the top plate 32. After the powder falls in, it passes through the inclined screening plate 48 inside the powder frame 45 and is screened through the hollow screen holes at the top of the screening plate 48. The material is screened to remove lumps and large particles, leaving only qualified fine powder that falls into the forming area of ​​the lower cavity plate 36. The upward tilt of the screen plate 48 near the inner guide plate 47 prevents powder accumulation. The arc-shaped structure of the inner guide plate 47 and the inclined structure of the pusher plate 44 guide and regulate the powder, ensuring that the powder is evenly filled into the forming cavity between the spiral groove of the cavity plate 36 and the inner mold rod 37, providing uniform and pure powder raw materials for subsequent pressing operations. The baffle frame 41 provides a limiting and protective function throughout the process to prevent powder from overflowing.

[0035] In the forming mechanism 2, the pressing cylinder 22 at the top of the support plate 21 extends out, driving the turntable 25 fixed at the bottom to move down, causing the forming column 24, which is rotatably connected to the turntable 25, to slide vertically down along the inner wall of the outer column cylinder 23. The spiral groove on the inner wall of the outer column cylinder 23 is adapted to the spiral protrusion on the outer side of the forming column 24. The forming column 24 rotates synchronously during the pressing process, realizing a combined rotation and pressing motion. The spiral protrusions of the forming column 24 precisely correspond to the spiral tooth grooves on the inner wall of the cavity disk 36. Together with the inner forming rod 37 at the center of the cavity disk 36, the filled metallurgical powder is extruded and spun to form a precise replica of the inner and outer contour structure of the spiral gear. During the pressing operation, the steel brush ring 26 installed on the tapered surface at the bottom of the outer column 23 has its inner steel brush bristles continuously adhering to the outer spiral protrusions of the forming column 24, cleaning the fine powder adhering to the surface of the forming column 24 in real time during the pressing process. This prevents the powder from sticking and causing defects in the gear forming process, achieving synchronous anti-sticking and cleaning during the pressing process. After pressing to the set stroke, the pressing cylinder 22 pauses to hold the pressure, ensuring that the gear blank is densely formed.

[0036] In the mold mechanism 3, after the gear blank is pressed and formed, the pressure cylinder 22 retracts, driving the pressing column 24 to rotate and return to its original position, separating it from the forming area of ​​the cavity plate 36. The demolding and ejection mechanism starts operation, and the ejector cylinders 310 on both sides of the bottom of the bottom support frame 39 extend synchronously. The output end pushes the base plate 318 to slide upward along the inner wall of the outer cover cylinder 38. The base plate 318 pushes the top plate 312 upward through the spring 314. The top plate 312 drives the top-fixed steel brush cylinder 311 and the ejector plate. 34 moves upward synchronously. The outer protruding teeth of the ejector plate 34 match the helical grooves of the cavity plate 36, moving smoothly upward along the groove trajectory. This ejects the helical gear blank formed between the cavity plate 36 and the inner mold rod 37 entirely out of the mold cavity, completing the workpiece demolding. During the ejection process, guide posts 315, evenly distributed at the bottom of the ejector plate 312, slide through the base plate 318 to guide the ejector plate 34 vertically and smoothly, preventing offset and deformation of the gear blank during ejection. The outer ring at the bottom of the guide posts 315... 316 slides against the outer side of the inner molded rod 37, further improving the coaxiality of the ejection and isolating powder to prevent the guide structure from jamming. The inner retaining ring 317 on the inner wall of the outer casing 38 provides initial limit for the top plate 312, and the outer retaining ring 313 provides fixed support for the outer casing 38 to ensure the stability of the ejection operation. After the workpiece is demolded and removed, the ejector cylinder 310 slowly retracts, driving the base plate 318 to move down. The spring 314 returns to its original position, and the top plate 312, steel brush cylinder 311, and ejector plate 34 descend synchronously. During the reciprocating motion of the lifting mechanism, the steel brush bristles on the outer side of the steel brush cylinder 311 continuously adhere to the outer side of the inner mold rod 37 and the spiral toothed grooves on the inner wall of the cavity plate 36 for all-round cleaning, thoroughly removing the fine metallurgical powder residue on the inner wall of the mold, effectively preventing the powder from drying and sticking to the mold, solving the problem of cleaning the dead corners of the spiral toothed grooves, and achieving mold anti-stick protection. The cylinder 42 of the pushing mechanism 4 can extend and retract as needed, driving the powder frame 45 to slide along the inner wall of the baffle frame 41, adjusting the feeding position, and cleaning the residual powder in the frame. The mold mechanism 3 is fixed to the inner wall of the frame 1 by the support column 31, the base plate 33, and the connecting block 35, maintaining structural stability throughout the process. After all mechanisms are fully reset, the equipment enters the standby state, waiting for the next round of molding operations.

Claims

1. A powder metallurgy molding machine for preventing sticking of automotive helical gears, characterized in that, include: The frame (1) has a forming mechanism (2) installed on its top and a molding mechanism (3) installed inside the frame (1). The molding mechanism (3) is located directly below the frame (1) and a pushing mechanism (4) is installed on its top. The molding mechanism (3) includes a top plate (32), a circular groove is provided at the center of the top of the top plate (32), and a cavity plate (36) is fixedly installed at the circular groove of the top plate (32). The inner wall of the cavity plate (36) is uniformly provided with spiral grooves and spiral toothed grooves. Support columns (31) are fixedly installed at the corners of the bottom of the top plate (32). A bottom plate (33) is fixedly installed at the bottom end of the support column (31). A bottom support frame (39) is fixedly installed at the bottom of the bottom plate (33). An outer cover (38) is fixedly installed at the bottom of the molded plate (36). A top material plate (34) is slidably installed on the inner wall of the outer cover (38). The outer side of the top material plate (34) is evenly provided with protruding teeth. The protruding teeth of the top material plate (34) are adapted to the spiral tooth groove of the cavity plate (36). A steel brush cylinder (311) is rotatably installed at the bottom of the top material plate (34). Steel brush bristles are evenly provided on the outer side of the steel brush cylinder (311). An inner mold rod (37) is fixedly installed at the center of the top of the bottom support frame (39). The top of the inner mold rod (37) is flush with the top of the cavity plate (36).

2. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 1, characterized in that: Connecting blocks (35) are fixedly installed on both sides of the base plate (33). The base plate (33) is fixedly connected to the inner wall of the frame (1) through the connecting blocks (35). The inner wall of the steel brush cylinder (311) and the top plate (34) are slidably adapted to the outer side of the inner rod (37). The bottom of the steel brush cylinder (311) is fixedly installed with a top plate (312). An outer retaining ring (313) is fixedly installed on the outer side of the outer cover (38). The bottom of the outer retaining ring (313) is fixedly connected to the top of the base plate (33). An inner retaining ring (317) is fixedly installed on the inner wall of the outer cover (38). The edge of the bottom of the top plate (312) is in contact with the top of the inner retaining ring (317).

3. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 2, characterized in that: A base plate (318) is slidably installed on the bottom of the inner wall of the outer cover (38), and a spring (314) is fixedly installed between the base plate (318) and the top plate (312). The bottom of the top plate (312) is fixedly installed with guide posts (315). The guide posts (315) are evenly installed at the bottom of the top plate (312) along the center position, and the bottom of the guide posts (315) penetrates the chassis (318) and extends to its bottom.

4. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 3, characterized in that: Both sides of the bottom of the bottom support frame (39) are fixedly installed with top material cylinders (310). The output end of the top material cylinder (310) passes through the bottom support frame (39) and is fixedly connected to the bottom of the chassis (318). The bottom of the guide column (315) is fixedly connected with an outer ring (316). The inner wall of the outer ring (316) is in contact with the outer side of the inner shape bar (37).

5. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 4, characterized in that: The pushing mechanism (4) includes a baffle frame (41), which is fixedly installed on the top of the top plate (32). A cylinder (42) is fixedly installed on the outside of the baffle frame (41). The cylinder (42) is symmetrically installed along the center of the axis of the baffle frame (41). The output end of the cylinder (42) passes through the baffle frame (41) and extends into its interior.

6. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 5, characterized in that: A powder frame (45) is slidably installed on the inner wall of the baffle frame (41). The output end of the cylinder (42) is fixedly connected to the outer side of the powder frame (45). The bottom of the powder frame (45) is attached to the top of the top plate (32). A top cover plate (43) is fixedly installed on the top of the powder frame (45). A rectangular groove is opened on the top of the top cover plate (43). A feeding cover (46) is fixedly installed at the rectangular groove on the top of the top cover plate (43).

7. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 6, characterized in that: An inner guide plate (47) is fixedly installed on the inner wall of the powder frame (45) at the end away from the cylinder (42). The side of the inner guide plate (47) near the cylinder (42) is an arc surface with a concave center position. A pusher plate (44) is fixedly installed on the other side of the inner guide plate (47). The side of the pusher plate (44) away from the inner guide plate (47) is an inclined surface with a concave center position.

8. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 7, characterized in that: A sieve plate (48) is fixedly installed on the inner wall of the powder frame (45). The top of the sieve plate (48) is evenly provided with perforated sieve holes. The sieve plate (48) is inclined inside the powder frame (45), and the end of the sieve plate (48) near the inner guide plate (47) is inclined upward.

9. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 8, characterized in that: The forming mechanism (2) includes a support plate (21), which is fixedly installed on the top of the frame (1). A pressing cylinder (22) is fixedly installed at the center of the top of the support plate (21). The output end of the pressing cylinder (22) passes through the support plate (21) and extends to its bottom. An outer column (23) is fixedly installed at the bottom of the support plate (21). The inner wall of the outer column (23) is uniformly provided with spiral grooves.

10. The anti-sticking powder metallurgy molding machine for automotive helical gears according to claim 9, characterized in that: A forming column (24) is slidably installed on the inner wall of the outer column (23). The outer side of the forming column (24) is evenly provided with spiral protrusions, and the spiral protrusions of the forming column (24) are adapted to the spiral tooth groove of the cavity plate (36). A turntable (25) is rotatably installed on the top of the forming column (24). The top of the turntable (25) is fixedly connected to the output end of the pressing cylinder (22). The bottom of the inner wall of the outer column (23) is a conical surface with an inner diameter that gradually increases from top to bottom. A steel brush ring (26) is fixedly installed on the conical surface of the outer column (23). The inner wall of the steel brush ring (26) is evenly provided with steel brush bristles.

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