Forming die for internal gear powder metallurgy

Abstract

The utility model discloses a forming die for powder metallurgy of an internal gear, and relates to the technical field of powder metallurgy. The device comprises a device body, a protection mechanism is arranged on the outer side of an upper pressing die, the protection mechanism comprises a fixing ring and an abutting ring, an empty groove is formed between the fixing ring and the abutting ring, a guide rod is arranged in the empty groove, a pressure spring is arranged on the outer side of the guide rod, a hoop ring is arranged on the top of the fixing ring, and a clamping groove is formed in the outer side of the hoop ring. According to the protection mechanism, the abutting ring abuts against the edge matching position of the upper pressing die and the die groove, powder raw materials in the die groove can be effectively prevented from overflowing or splashing, meanwhile, the air quality environment of an operation workshop is remarkably improved through the blocking effect, and due to the fact that powder overflowing and splashing are effectively controlled, the production efficiency is improved. And air pollution in a workshop is reduced, so that the health of operators is protected, the working environment is improved, and the cleanliness and convenience in the powder metallurgy process are also enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy, in particular to a forming die for powder metallurgy of an internal gear. Background Art

[0002] Powder metallurgy internal gear is an internal gear manufactured by powder metallurgy process. Powder metallurgy is an advanced metal forming technology. It manufactures metal products with desired physical and chemical properties by pressing metal powder into the desired shape and sintering it in a controlled environment. Compared with traditional machining methods, powder metallurgy process has many advantages, such as the ability to manufacture parts with complex shapes, reduce material waste, and improve production efficiency. When manufacturing internal gears, powder metallurgy process can achieve high-precision tooth shape and pitch while ensuring the strength and wear resistance of the gear.

[0003] In the existing powder metallurgy process, metal powder is usually formed by pressing and matching the upper die with the die groove to form a workpiece that conforms to the shape of the die groove. However, during the pressing process, when the metal powder is placed in the die groove, they are in a loose state and there are gaps between the particles. At the same time, since the fit between the upper die and the die groove is not completely tight, some metal powder will overflow or splash out from the fitting gap between the upper die and the die groove when under pressure in order to exclude the air between the particles. This situation not only affects the effectiveness of the pressing process, but more importantly, it leads to air pollution problems in the external operating workshop, posing a potential threat to the working environment and the health of operators. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a forming die for powder metallurgy of internal gears to solve the technical problem that part of metal powder overflows from the matching gap between the upper die and the die groove, causing air pollution in the external operating workshop.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a forming die for powder metallurgy of an internal gear, comprising a device body, a hydraulic device is arranged on the top of the device body, an upper die is arranged at the telescopic end of the hydraulic device, four guide columns are arranged inside the device body, a movable plate is arranged on the guide column, a die groove is opened on the surface of the movable plate, and a protective mechanism is arranged on the outer side of the upper die;

[0006] The protection mechanism comprises a fixing ring and a pressing ring, an empty groove is arranged between the fixing ring and the pressing ring, a guide rod is arranged inside the empty groove, a pressure spring is arranged outside the guide rod, and a hoop ring is arranged on the top of the fixing ring.

[0007] By adopting the above technical solution, the pressure ring is used to press against the edge of the upper die and the die groove, which is helpful to prevent the powder raw material inside the die groove from overflowing or splashing, directly reducing the loss of powder during the pressing process, not only saving raw materials but also reducing pollution to the surrounding environment.

[0008] Furthermore, the protection mechanism is provided in two groups, and the two groups of the protection mechanism are arranged in a mirror image, and the fixing ring and the pressure ring are in a semicircular ring structure.

[0009] By adopting the above technical solution, it can be ensured that the upper die is evenly and stably supported and protected during the pressing process. Since the fixing ring and the pressure ring are semi-circular ring structures, they can better adapt to and fit the shape of the upper die, thereby providing effective sealing and blocking effects.

[0010] Furthermore, mounting plates are provided on both sides of the hoop, through holes are provided on the mounting plates, and the two hoop rings are fixedly connected by bolts passing through the through holes.

[0011] By adopting the above technical solution, the installation and disassembly of the protective mechanism becomes simple and convenient, and the through holes on the installation plate allow bolts to pass through easily, thereby achieving a firm connection between the two hoops.

[0012] Furthermore, the bottom end of the guide rod is fixedly connected to the pressure ring, and the other end of the guide rod passes through the fixing ring.

[0013] By adopting the above technical solution, the pressure ring can stably move along the guide rod when subjected to pressure. This stable movement ensures that the protection mechanism can effectively adapt to the pressing process between the upper die and the die groove.

[0014] Furthermore, a plurality of guide rods and pressure springs are provided, and the plurality of guide rods are arranged in an equidistant ring shape along the central axis of the pressure ring.

[0015] By adopting the above technical solution, the structural stability and uniform force bearing of the protective mechanism are enhanced, and the distribution of multiple guide rods ensures that the pressure ring can move evenly and stably when subjected to pressure.

[0016] Furthermore, an outer protective layer is provided on the outer side of the hollow groove, and the cross section of the outer protective layer is a corrugated structure.

[0017] By adopting the above technical solution, the inner guide rod and pressure spring can be effectively protected from external damage. The strength and stability of the corrugated structure can withstand external impacts, reducing the risk of deformation or damage of the guide rod and pressure spring due to external factors.

[0018] Furthermore, a retaining ring is fixedly arranged on the inner side of the fixing ring, and the bottom end of the retaining ring abuts against the top surface of the upper die.

[0019] By adopting the above technical solution, the retaining ring abuts against the top of the upper die, thereby effectively forming a barrier to prevent powder that may be generated during the pressing process from splashing into the interior of the protective mechanism.

[0020] Furthermore, a limiting ring is fixedly connected to the inner side of the pressure ring, the inner side of the limiting ring is in contact with the outer side of the upper die, and the limiting ring and the retaining ring are arranged in a staggered manner.

[0021] By adopting the above technical solution, the inner side of the limit ring abuts against the outer side of the retaining ring, providing a guiding function for the pressure ring, ensuring its stability and accuracy during movement, and limiting the movement trajectory of the pressure ring, which helps to reduce the overflow or splashing of powder during the pressing process.

[0022] Furthermore, cylinders are provided on both sides of the top of the movable plate, and demoulding columns are provided on the inner bottom of the device body, and the demoulding columns are located opposite to the mold groove.

[0023] By adopting the above technical solution, the cylinder can provide stable lifting power for the movable plate, ensuring its stability and reliability during the pressing and demolding process. The precise control of the cylinder also helps to reduce operating errors and improve the quality and consistency of powder metallurgy products.

[0024] Furthermore, a loading device is provided on one side of the movable plate, and the loading device includes a material collecting box and a slide rail.

[0025] By adopting the above technical solution, the feeding device can automatically transport the powder raw materials into the die cavity, eliminating the tedious process of manual feeding and greatly improving production efficiency. The collection box is used to store the powder raw materials, and the slide rail ensures that the powder can slide into the die cavity smoothly and accurately.

[0026] In summary, the utility model mainly has the following beneficial effects:

[0027] 1. The utility model uses a protective mechanism to use a pressing ring to press against the edge of the upper die and the die groove, which can effectively prevent the powder raw material inside the die groove from overflowing or splashing, directly reducing the waste of powder during the pressing process and maintaining the accuracy of the pressing operation. At the same time, this blocking effect significantly improves the air quality environment of the operation workshop. Since the powder overflow and splashing are effectively controlled, the air pollution in the workshop is reduced, thereby protecting the health of the operators and improving the working environment. This also enhances the cleanliness and convenience of the powder metallurgy process, because the need to clean up the overflowed powder is reduced, making the entire production process more efficient and smooth;

[0028] 2. The utility model provides a baffle ring and a limit ring, and utilizes the abutment of the baffle ring against the top of the upper die to directly prevent powder generated during the pressing process from splashing into the interior of the protective mechanism, thereby maintaining the cleanliness and normal operation of the interior. At the same time, the inner side of the limit ring tightly abuts against the outer side of the baffle ring, which not only provides precise guiding for the pressure ring, ensuring its stability and accuracy during operation, but also further enhances the effect of preventing powder from entering the empty slot. This double protection design significantly improves the effectiveness of blocking powder and protects the cleanliness and efficiency of the powder metallurgy process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0030] Figure 2 It is a structural schematic diagram of the protection mechanism of the utility model;

[0031] Figure 3 It is a cross-sectional structural schematic diagram of the protection mechanism of the utility model;

[0032] Figure 4 It is a schematic diagram of the assembly cross-sectional structure of the protective mechanism of the utility model.

[0033] In the figure: 1. device body; 2. hydraulic device; 301. upper die; 302. die groove; 4. movable plate; 5. protective mechanism; 501. fixing ring; 502. pressure ring; 503. hoop; 504. mounting plate; 505. through hole; 506. empty groove; 507. outer protective layer; 508. retaining ring; 509. limiting ring; 510. guide rod; 511. pressure spring; 6. cylinder; 7. guide column; 8. demoulding column; 9. feeding device. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0035] The following describes an embodiment of the utility model based on its overall structure.

[0036] Embodiment 1:

[0037] A forming die for powder metallurgy of internal gears, such as Figure 1-Figure 4As shown, the device body 1 includes a hydraulic device 2 disposed on the top of the device body 1, an upper die 301 disposed at the telescopic end of the hydraulic device 2, four guide columns 7 disposed inside the device body 1, a movable plate 4 disposed on the guide columns 7, a mold groove 302 disposed on the surface of the movable plate 4, and a protective mechanism 5 disposed on the outer side of the upper die 301;

[0038] The protection mechanism 5 includes a fixed ring 501 and a pressure ring 502, a hollow groove 506 is arranged between the fixed ring 501 and the pressure ring 502, a guide rod 510 is arranged inside the hollow groove 506, a pressure spring 511 is arranged on the outer side of the guide rod 510, and a hoop ring 503 is arranged on the top of the fixed ring 501. The pressure ring 502 is used to press against the edge of the upper die 301 and the die groove 302, which is beneficial to prevent the powder raw material inside the die groove 302 from overflowing or splashing, directly reducing the loss of powder during the pressing process, not only saving raw materials, but also reducing pollution to the surrounding environment. At the same time, by preventing powder from overflowing, it is beneficial to improve the air quality environment of the operating workshop. The reduction of powder directly improves the air condition of the workshop, protects the health of operators, and makes the working environment cleaner.

[0039] See also Figure 2 , Figure 3 , Figure 4 There are two groups of protective mechanisms 5, and the two groups of protective mechanisms 5 are mirror-imaged. The fixing ring 501 and the pressing ring 502 are semicircular ring structures, which can ensure that the upper die 301 is evenly and stably supported and protected during the pressing process. Since the fixing ring 501 and the pressing ring 502 are semicircular ring structures, they can better adapt to and fit the shape of the upper die 301, thereby providing effective sealing and blocking effects. At the same time, the two groups of protective mechanisms 5 can effectively prevent metal powder from overflowing or splashing from the die groove 302, which not only improves the cleanliness and convenience of the powder metallurgy process, but also is beneficial to protecting the air quality environment of the operation workshop and reducing the health risks to operators.

[0040] See also Figure 2 , Figure 3 , Figure 4 , mounting plates 504 are provided on both sides of the hoop 503, and through holes 505 are opened on the mounting plates 504. The two hoop rings 503 are fixedly connected by bolts passing through the through holes 505, so that the installation and disassembly of the protective mechanism 5 becomes simple and convenient. The through holes 505 on the mounting plates 504 allow the bolts to pass through easily, thereby realizing the firm connection of the two hoop rings 503. At the same time, this connection method also ensures the stability and reliability of the protective mechanism 5 during use. The bolt connection can effectively prevent the hoop ring 503 from moving or separating during the pressing process, thereby ensuring that the protective mechanism 5 can always effectively block the overflow or splashing of metal powder.

[0041] See also Figure 2 , Figure 3 , Figure 4 The bottom end of the guide rod 510 is fixedly connected to the pressure ring 502, and the other end of the guide rod 510 passes through the fixed ring 501, so that the pressure ring 502 can move stably along the guide rod 510 when under pressure. This stable movement ensures that the protective mechanism 5 can effectively adapt to the pressing process between the upper die 301 and the die groove 302. At the same time, the penetration and fixation of the guide rod 510 also enhances the overall structural stability of the protective mechanism 5. During the pressing process, the relative movement between the fixed ring 501 and the pressure ring 502 is smoother and more reliable.

[0042] See also Figure 2 , Figure 3 , Figure 4 There are multiple guide rods 510 and pressure springs 511, and the multiple guide rods 510 are arranged in an equidistant ring along the central axis of the pressure ring 502, which enhances the structural stability and uniform force of the protection mechanism 5. The distribution of the multiple guide rods 510 ensures that the pressure ring 502 can move evenly and stably when under pressure. At the same time, the setting of the pressure spring 511 provides an elastic buffering effect, which helps to absorb the impact force during the pressing process and reduces the risk of damage to the protection mechanism 5 and the upper die 301, which not only improves the service life of the protection mechanism 5, but also helps to maintain the stability and continuity of the powder metallurgy process.

[0043] Embodiment 2:

[0044] See also Figure 2 , Figure 3 , Figure 4 An outer protective layer 507 is arranged on the outer side of the hollow groove 506. The cross-section of the outer protective layer 507 is a corrugated structure, which can effectively protect the inner guide rod 510 and the pressure spring 511 from external damage. The strength and stability of the corrugated structure can withstand external impacts and reduce the risk of deformation or damage of the guide rod and the pressure spring due to external factors. At the same time, the corrugated structure of the outer protective layer 507 can also adapt to the compression process of the pressure spring 511. The elasticity of the corrugated structure enables the outer protective layer 507 to provide a certain buffer space when the pressure spring 511 is compressed, thereby ensuring that the pressure spring 511 can work normally without being restricted by the outside.

[0045] See also Figure 2 , Figure 3 , Figure 4A retaining ring 508 is fixedly arranged on the inner side of the fixing ring 501, and the bottom end of the retaining ring 508 abuts against the top surface of the upper die 301. The abutment of the retaining ring 508 against the top of the upper die 301 effectively forms a barrier to prevent powder splashing that may be generated during the pressing process from entering the interior of the protective mechanism 5. At the same time, this abutment method also helps to keep the interior of the protective mechanism 5 clean, reducing the risk of failure caused by powder intrusion, thereby ensuring the normal operation and service life of the protective mechanism 5, which not only improves the operating convenience of the powder metallurgy process, but also helps to maintain the cleanliness and safety of the entire production environment.

[0046] See also Figure 2 , Figure 3 , Figure 4 The inner side of the pressure ring 502 is fixedly connected to the limiting ring 509, the inner side of the limiting ring 509 fits with the outer side of the upper die 301, the limiting ring 509 and the retaining ring 508 are arranged in an alternating manner, and the inner side of the limiting ring 509 abuts against the outer side of the retaining ring 508, providing a guiding effect for the pressure ring 502, ensuring its stability and accuracy during movement, and by limiting the moving trajectory of the pressure ring 502, it helps to reduce the overflow or splashing of powder during the pressing process. At the same time, this abutment method further prevents powder from entering the interior of the empty groove 506. The empty groove 506 is an important part of the protective mechanism 5. If powder enters it, it may affect the normal operation of the protective mechanism 5. The cooperation between the limiting ring 509 and the retaining ring 508 effectively blocks the invasion of powder and improves the effectiveness of blocking powder, thereby ensuring the reliability and durability of the protective mechanism 5.

[0047] See also Figure 1 , cylinders 6 are provided on both sides of the top of the movable plate 4, and demolding columns 8 are provided on the inner bottom of the device body 1. The demolding columns 8 are opposite to the die groove 302. The cylinder 6 can provide stable lifting power for the movable plate 4 to ensure its stability and reliability during the pressing and demolding process. The precise control of the cylinder 6 also helps to reduce operating errors and improve the quality and consistency of powder metallurgy products. At the same time, the demolding columns 8 arranged at the bottom of the device body 1 are opposite to the die groove 302, making the demolding process more efficient and convenient. After the pressing is completed, the movable plate 4 is pushed up by the cylinder 6, and the demolding columns 8 can accurately eject the molded product in the die groove 302, realizing fast and non-destructive demolding operation, which not only improves production efficiency, but also helps to protect the integrity and precision of the product.

[0048] See also Figure 1A feeding device 9 is provided on one side of the movable plate 4. The feeding device includes a feed box and a slide rail. The feeding device 9 can automatically convey the powder raw material to the die groove 302, eliminating the tedious process of manual feeding and greatly improving the production efficiency. The feed box is used to store the powder raw material, and the slide rail ensures that the powder can slide smoothly and accurately into the die groove 302. At the same time, this feeding method also helps to reduce the waste and pollution of powder during the transportation process, thereby reducing production costs and improving the working environment. The automated feeding device 9 also reduces human operation errors and improves the quality and consistency of powder metallurgy products.

[0049] The implementation principle of the utility model is as follows: first, the material collecting box slides to the top of the die groove 302 through the slide rail, and the powder raw material inside the material collecting box is poured into the inside of the die groove 302 to complete the feeding operation. Subsequently, the upper die 301 at the telescopic end of the hydraulic device 2 gradually approaches one side of the die groove 302 and performs the die-casting operation. During this process, the pressing ring 502 abuts against the top surface of the movable plate 4. As the upper die 301 is gradually pressed down inside the die groove 302, the fixed ring 501 is pressed and gradually approaches the pressing ring 502, and the pressure spring 511 is compressed and contracts;

[0050] During the pressing and matching process between the upper die 301 and the die groove 302, the pressing ring 502 is used to press against the edge of the upper die 301 and the die groove 302, which is beneficial to prevent the powder raw materials inside the die groove 302 from overflowing or splashing, which is beneficial to improving the air quality environment of the operation workshop and enhancing the cleaning convenience of the powder metallurgy process. After that, the hydraulic device 2 controls the upper die 301 to move away from the die groove 302, and at the same time, the cylinders 6 on both sides push the movable plate 4, so that the movable plate 4 moves downward along the direction of the guide column 7, and cooperates with the demoulding column 8 to complete the demoulding operation of the internal gear, thereby completing the powder die-casting operation of the internal gear;

[0051] The abutment of the retaining ring 508 against the top of the upper die 301 is helpful to prevent the powder at the splashing point from entering the interior of the protective mechanism 5. At the same time, the inner side of the limiting ring 509 abuts against the outer side of the retaining ring 508 to provide a guiding effect for the pressure ring 502 and further prevent the powder from entering the interior of the empty groove 506, thereby improving the effectiveness of blocking the powder.

[0052] Parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art, and will not be described in detail here.

[0053] Although an embodiment of the utility model has been shown and described, this specific embodiment is only an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A forming die for powder metallurgy of internal gears, characterized in that: The device comprises a device body (1), a hydraulic device (2) is arranged on the top of the device body (1), an upper die (301) is arranged at the telescopic end of the hydraulic device (2), four guide columns (7) are arranged inside the device body (1), a movable plate (4) is arranged on the guide columns (7), a die groove (302) is opened on the surface of the movable plate (4), and a protective mechanism (5) is arranged on the outer side of the upper die (301); The protection mechanism (5) comprises a fixing ring (501) and a pressing ring (502), a hollow groove (506) is arranged between the fixing ring (501) and the pressing ring (502), a guide rod (510) is arranged inside the hollow groove (506), a pressure spring (511) is arranged outside the guide rod (510), and a hoop ring (503) is arranged on the top of the fixing ring (501).

2. The internal gear powder metallurgy forming die according to claim 1, characterized in that: The protection mechanism (5) is provided in two groups, and the two groups of the protection mechanism (5) are arranged in a mirror image, and the fixing ring (501) and the pressing ring (502) are in a semicircular ring structure.

3. The internal gear powder metallurgy forming die according to claim 1, characterized in that: Both sides of the hoop ring (503) are provided with mounting plates (504), and a through hole (505) is opened on the mounting plate (504). The two hoop rings (503) are fixedly connected by bolts passing through the through holes (505).

4. The internal gear powder metallurgy forming die according to claim 1, characterized in that: The bottom end of the guide rod (510) is fixedly connected to the pressing ring (502), and the other end of the guide rod (510) passes through the fixing ring (501).

5. The internal gear powder metallurgy forming die according to claim 1, characterized in that: A plurality of guide rods (510) and pressure springs (511) are provided, and the plurality of guide rods (510) are arranged in an equidistant annular pattern along the central axis of the pressure ring (502).

6. The internal gear powder metallurgy forming die according to claim 1, characterized in that: An outer protective layer (507) is arranged on the outer side of the hollow groove (506), and the cross section of the outer protective layer (507) is a corrugated structure.

7. The internal gear powder metallurgy forming die according to claim 1, characterized in that: A retaining ring (508) is fixedly arranged on the inner side of the fixing ring (501), and the bottom end of the retaining ring (508) abuts against the top surface of the upper pressing die (301).

8. The internal gear powder metallurgy forming die according to claim 7, characterized in that: The inner side of the pressure ring (502) is fixedly connected to a limiting ring (509), the inner side of the limiting ring (509) is in contact with the outer side of the upper die (301), and the limiting ring (509) and the retaining ring (508) are arranged in a staggered manner.

9. The internal gear powder metallurgy forming die according to claim 1, characterized in that: Cylinders (6) are provided on both sides of the top of the movable plate (4), and a demoulding column (8) is provided at the inner bottom of the device body (1), and the demoulding column (8) is located opposite to the mold groove (302).

10. The internal gear powder metallurgy forming die according to claim 1, characterized in that: A loading device (9) is provided on one side of the movable plate (4), and the loading device comprises a material collecting box and a slide rail.

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