Powder metallurgy die for producing duplex gear

Abstract

The utility model provides a powder metallurgy die for producing duplex teeth. The powder metallurgy die comprises a forming core rod, a second forming lower punch, a first forming lower punch, a forming female die and a first forming upper punch. The forming core rod comprises a first forming core rod and second forming core rods, the first forming core rod is arranged in the center of the forming core rod, and the second forming core rods surround the center of the forming core rod and are arranged on the periphery of the forming core rod at intervals; a forming female die cavity is formed in the center of the forming female die; the first forming core rod and the second forming core rod sequentially penetrate through the second forming lower punch, the first forming lower punch, the forming female die and the first forming upper punch from bottom to top, and the first forming lower punch and the first forming upper punch are sequentially arranged in a cavity of the forming female die from bottom to top. According to the utility model, the precise die design is utilized to continuously press the duplex teeth in batches, so that the defects caused by machine table equipment errors and cutter loss in the traditional machining process are reduced, the production efficiency is greatly improved, and the loss of raw materials is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy molds, in particular to a powder metallurgy mold for producing double-connected gears. Background Art

[0002] Double-connected gears are mainly applied to the main shaft box of a reducer, an automobile gearbox and other gear transmission mechanisms. They are coaxially connected by two gears and used to change the rotation speed or velocity of an output shaft, and have great development space in industries such as multi-axis numerical control machine tools and automobile manufacturing. Double-connected gears transmit power through two pairs of meshing gears. During the design and manufacturing process, the matching accuracy of the two pairs of gears needs to be considered. It is required that parameters such as the tooth profile, modulus, and pressure angle of the gears can ensure the matching accuracy between the two pairs of gears to achieve the goals of high transmission efficiency and low noise; precise machining requirements: the machining of double-connected gears needs to ensure the accuracy of the gear tooth surface and tooth profile to ensure the transmission performance of the gears. High-precision numerical control machine tools and tools are required during machining, and precise machining processes such as hobbing and gear grinding are adopted to ensure the matching accuracy and surface quality of the gears. Therefore, the manufacturing cost is very expensive. The powder metallurgy process has favorable conditions such as high precision, high stability, and high material utilization rate, and is extremely suitable for producing double-connected gears. Summary of the Invention

[0003] Aiming at the deficiencies existing in the prior art, the utility model provides a powder metallurgy mold for producing double-connected gears. By using precise mold design, continuous batch pressing of double-connected gears is carried out, which not only reduces the defects formed by the errors of machine tools and equipment and tool wear in general traditional machining, but also greatly improves the production efficiency and reduces the raw material loss. In the current highly competitive industrial field.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A powder metallurgy mold for producing double-connected gears, which includes a forming core rod, a second lower forming punch, a first lower forming punch, a forming female die, and a first upper forming punch;

[0006] The forming core rod includes a first forming core rod and a second forming core rod. The first forming core rod is arranged at the central part of the forming core rod, and the second forming core rod surrounds the central part of the forming core rod and is arranged at intervals on the outer periphery of the forming core rod; a forming female die cavity is arranged at the center of the forming female die;

[0007] The first forming core rod and the second forming core rod sequentially pass through the second lower forming punch, the first lower forming punch, the forming female die and the first upper forming punch from bottom to top, and the first lower forming punch and the first upper forming punch are sequentially arranged in the forming female die cavity from bottom to top.

[0008] Preferably, for the powder metallurgy mold for producing double gears, wherein: the forming mandrel further includes a forming mandrel base and a forming mandrel upper cover; the forming mandrel upper cover is arranged on the forming mandrel base, and the first forming mandrel and the second forming mandrel sequentially pass through the forming mandrel upper cover and the forming mandrel base and are fixed by forming mandrel assembly screws.

[0009] Preferably, for the powder metallurgy mold for producing double gears, wherein: the first forming mandrel includes a first forming mandrel mounting seat, a first forming mandrel escape section and a first forming mandrel effective section arranged in sequence from bottom to top, the outer diameter of the first forming mandrel escape section is 0.2 - 1 mm smaller than the outer diameter of the first forming mandrel effective section, and the outer diameter of the first forming mandrel mounting seat is 6 - 10 mm larger than the outer diameter of the first forming mandrel effective section;

[0010] The second forming mandrel includes a second forming mandrel mounting seat, a second forming mandrel escape section and a second forming mandrel effective section in sequence from bottom to top, the outer diameter of the second forming mandrel escape section is 0.2 - 1 mm smaller than the outer diameter of the second forming mandrel effective section, and the outer diameter of the second forming mandrel mounting seat is 6 - 10 mm larger than the outer diameter of the second forming mandrel effective section.

[0011] Preferably, for the powder metallurgy mold for producing double gears, wherein: the forming mandrel base includes a first forming mandrel installation cavity and a plurality of second forming mandrel installation cavities, the first forming mandrel installation cavity is arranged at the central part of the forming mandrel base and is matched with the first forming mandrel mounting seat, and the second forming mandrel installation cavities surround the center of the forming mandrel base and are arranged on the outer periphery of the forming mandrel base and are matched with the second forming mandrel mounting seats; forming mandrel fixing studs for cooperating with the forming machine equipment are arranged at the bottom of the forming mandrel base, and a plurality of locking threaded holes are arranged at the top of the forming mandrel base;

[0012] A first forming mandrel through - hole for cooperating with the first forming mandrel is arranged at the central part of the forming mandrel upper cover, a second forming mandrel through - hole for cooperating with the second forming mandrel is arranged on the outer periphery of the forming mandrel upper cover, locking counter - sunk holes for cooperating with the locking threaded holes are further arranged on the forming mandrel upper cover, and the aperture of the first forming mandrel through - hole is 0.1 - 1 mm larger than the outer diameter of the first forming mandrel effective section.

[0013] Preferably, for the powder metallurgy mold for producing double-connected teeth, where: the lower second punch for forming includes a lower second punch base and a lower second punch head disposed at the upper end of the lower second punch base. The lower second punch base is sequentially provided with a first cylinder of the lower second punch base, a second cylinder of the lower second punch base, and a third cylinder of the lower second punch base from bottom to top. The outer side of the lower second punch head is sequentially provided with a first tooth surface of the lower second punch and a second tooth surface of the lower second punch from top to bottom. The second tooth surface of the lower second punch is 0.1 - 0.5 mm smaller than the first tooth surface of the lower second punch;

[0014] A central through hole of the lower second punch is provided in the center of the lower second punch. The central through hole of the lower second punch includes a first round hole of the lower second punch and a second round hole of the lower second punch sequentially arranged from top to bottom. The first round hole of the lower second punch is matched with the effective section of the first forming mandrel. The second round hole of the lower second punch is 0.2 - 1 mm larger than the first round hole of the lower second punch;

[0015] A plurality of through holes for the second mandrel of the lower second punch are provided on the lower second punch base. The through holes for the second mandrel of the lower second punch surround the center of the lower second punch and penetrate through the first cylinder of the lower second punch base, the second cylinder of the lower second punch base and are matched with the second forming mandrel. The diameter of the through holes for the second mandrel of the lower second punch is 0.2 - 1 mm larger than the outer diameter of the effective section of the second forming mandrel.

[0016] Preferably, for the powder metallurgy mold for producing double-connected teeth, where: the lower first punch for forming includes a lower first punch base and a lower first punch head sequentially arranged from bottom to top. The lower first punch base includes a first cylinder of the lower first punch base and a second cylinder of the lower first punch base sequentially arranged from bottom to top. The outer side of the lower first punch head is provided with a first tooth surface of the lower first punch and a second tooth surface of the lower first punch disposed below the first tooth surface of the lower first punch. The outer diameter of the second tooth surface of the lower first punch is 0.1 - 0.5 mm smaller than the first tooth surface of the lower first punch;

[0017] A central through hole of the lower first punch is provided at the central part of the lower first punch. The central through hole of the lower first punch includes a tooth cavity of the lower first punch and a first round hole of the lower first punch sequentially arranged from top to bottom. The tooth cavity of the lower first punch is assembled with the first tooth surface of the lower second punch and the clearance is 0.01 - 0.02 mm. The diameter of the first round hole of the lower first punch is 0.2 - 1 mm larger than the third cylinder of the lower second punch base;

[0018] Around the center of the next punch for forming, a next punch for forming the second core rod is provided with the same number and pitch as the second forming core rod, and the next punch for forming the second core rod passes through a stepped hole. The stepped hole through which the next punch for forming the second core rod passes includes an upper section and a forming next punch second round hole surface with a mating clearance of 0.01 - 0.02 mm between the effective section of the second forming core rod. The lower section is a forming next punch third round hole surface that is 0.2 - 1 mm larger than the forming next punch second round hole surface.

[0019] Preferably, in the powder metallurgy mold for producing double - linked teeth, wherein: a forming cavity mold cavity is provided at the central part of the forming female mold, with a mating clearance of 0.01 - 0.02 mm between the forming cavity mold cavity and the first tooth surface of the next punch for forming.

[0020] Preferably, in the powder metallurgy mold for producing double - linked teeth, wherein: the upper punch for forming includes an upper punch base for forming and a punch head for forming arranged on the upper punch base for forming. The upper punch base for forming includes a first cylinder of the upper punch base for forming and a second cylinder of the upper punch base for forming arranged on the first cylinder of the upper punch base for forming. On the outer side of the punch head for forming the upper punch, a first tooth surface of the upper punch for forming and a second tooth surface of the upper punch for forming are provided. The second tooth surface of the upper punch for forming is arranged below the first tooth surface of the upper punch for forming and has an outer diameter 0.1 - 0.5 mm smaller than that of the first tooth surface of the upper punch for forming;

[0021] A central through - hole of the upper punch for forming is provided at the central part of the upper punch for forming. The central through - hole of the upper punch for forming includes a first round hole of the upper punch for forming and a second round hole of the upper punch for forming arranged in sequence from top to bottom. The first round hole of the upper punch for forming is mated with the effective section of the first forming core rod with a clearance of 0.01 - 0.02 mm, and the second round hole of the upper punch for forming is 0.2 - 1 mm larger than the first round hole of the upper punch for forming;

[0022] Around the center of the upper punch for forming, a plurality of stepped holes through which the second core rods of the upper punch for forming cooperate with the second forming core rod are provided. The stepped holes through which the second core rods of the upper punch for forming pass include a third round hole of the upper punch for forming and a fourth round hole of the upper punch for forming arranged in sequence from top to bottom. The third round hole of the upper punch for forming is mated with the effective section of the second forming core rod with a clearance of 0.01 - 0.02 mm, and the fourth round hole of the upper punch for forming is 0.2 - 1 mm larger than the third round hole of the upper punch for forming.

[0023] Compared with the prior art, the technical solution of the present utility model has the following beneficial effects:

[0024] The powder metallurgy mold for producing double-connected teeth of the present utility model uses precise mold design to perform batch and continuous pressing of double-connected teeth, which not only reduces the defects formed by the errors of machine tools and tool wear in general traditional machining, but also greatly improves production efficiency and reduces raw material loss. In the current highly competitive industrial field, it can significantly reduce production costs and enhance the company's competitiveness. Brief Description of the Drawings

[0025] Figure 1 It is a bottom view of the double-connected teeth.

[0026] Figure 2 It is a cross-sectional view of the double-connected teeth

[0027] Figure 3 It is a front view of the first forming mandrel of the present utility model.

[0028] Figure 4 It is a front view of the second forming mandrel of the present utility model.

[0029] Figure 5 It is an isometric partial cross-sectional view of the forming mandrel base of the present utility model.

[0030] Figure 6 It is an isometric partial cross-sectional view of the forming mandrel upper cover of the present utility model.

[0031] Figure 7 It is an isometric partial cross-sectional view of the forming mandrel of the present utility model.

[0032] Figure 8 It is an isometric partial cross-sectional view of the lower second punch of the forming of the present utility model.

[0033] Figure 9 It is an isometric partial cross-sectional view of the lower first punch of the forming of the present utility model.

[0034] Figure 10 It is an isometric view of the forming female die of the present utility model.

[0035] Figure 11 It is an isometric partial cross-sectional view of the upper first punch of the forming of the present utility model.

[0036] Figure 12 It is an assembly drawing of the powder metallurgy forming die for double-connected teeth of the present utility model. Detailed Description of the Preferred Embodiment

[0037] The present utility model will be further described below in conjunction with the specific drawings and embodiments.

[0038] As Figure 1-2The double gear 1 includes a middle gear 1-1 and a chassis gear 1-2. A first tooth surface 1-11 is provided on the outer side of the middle gear 1-1, and a second tooth surface 1-21 is provided on the outer side of the chassis gear 1-2. There is an installation hole 1-3 at the center of the double gear 1, and a plurality of weight reduction holes 1-4 are provided on the middle gear 1-2.

[0039] As Figure 3-12 shown: The present utility model provides a powder metallurgy mold for producing double gears, including a forming mandrel 2, a forming lower second punch 3, a forming lower first punch 4, a forming female die 5, and a forming upper first punch 6;

[0040] The forming mandrel 2 includes a first forming mandrel 2-1 and a second forming mandrel 2-2. The first forming mandrel 2-1 is arranged at the central part of the forming mandrel 2, and the second forming mandrel 2-2 surrounds the central part of the forming mandrel 2 and is arranged at intervals on the outer periphery of the forming mandrel 2; A forming female die cavity 5-1 is arranged at the center of the forming female die 5;

[0041] The first forming mandrel 2-1 and the second forming mandrel 2-2 sequentially pass through the forming lower second punch 3, the forming lower first punch 4, the forming female die 5, and the forming upper first punch 6 from bottom to top. The forming lower first punch 4 and the forming upper first punch 6 are sequentially arranged in the forming female die cavity 5-1 from bottom to top.

[0042] The forming mandrel 2 further includes a forming mandrel base 2-3 and a forming mandrel upper cover 2-4; The forming mandrel upper cover 2-4 is arranged on the forming mandrel base 2-3. The first forming mandrel 2-1 and the second forming mandrel 2-2 sequentially pass through the forming mandrel upper cover 2-4 and the forming mandrel base 2-3 and are fixed by forming mandrel assembly screws 2-5.

[0043] The first forming mandrel 2-1 includes a first forming mandrel mounting seat 2-13, a first forming mandrel escape section 2-12, and a first forming mandrel effective section 2-11 arranged sequentially from bottom to top. The outer diameter of the first forming mandrel escape section 2-12 is 0.2 to 1 mm smaller than the outer diameter of the first forming mandrel effective section 2-11, and the outer diameter of the first forming mandrel mounting seat 2-13 is 6 to 10 mm larger than the outer diameter of the first forming mandrel effective section 2-11;

[0044] The second forming mandrel 2-2 sequentially includes a second forming mandrel mounting seat 2-23, a second forming mandrel escape section 2-22, and a second forming mandrel effective section 2-21 from bottom to top. The outer diameter of the second forming mandrel escape section 2-22 is 0.2 to 1 mm smaller than the outer diameter of the second forming mandrel effective section 2-21, and the outer diameter of the second forming mandrel mounting seat 2-23 is 6 to 10 mm larger than the outer diameter of the second forming mandrel effective section 2-21.

[0045] The forming mandrel base 2-3 includes a first forming mandrel installation cavity 2-31 and a plurality of second forming mandrel installation cavities 2-32. The first forming mandrel installation cavity 2-31 is arranged at the central part of the forming mandrel base 2-3 and cooperates with the first forming mandrel mounting seat 2-13. The second forming mandrel installation cavities 2-32 surround the center of the forming mandrel base 2-3 and are arranged on the outer periphery of the forming mandrel base 2-3 to cooperate with the second forming mandrel mounting seats 2-23. A forming mandrel fixing stud 2-33 for cooperating with the forming machine equipment is arranged at the bottom of the forming mandrel base 2-3, and a plurality of locking threaded holes 2-34 are arranged at the top of the forming mandrel base 2-3;

[0046] A first forming mandrel through hole 2-41 for cooperating with the first forming mandrel 2-1 is arranged at the central part of the forming mandrel upper cover 2-4. A second forming mandrel through hole 2-42 for cooperating with the second forming mandrel 2-2 is arranged on the outer periphery of the forming mandrel upper cover 2-4. A locking counterbore 2-43 for cooperating with the locking threaded hole 2-34 is also arranged on the forming mandrel upper cover 2-4. The diameter of the first forming mandrel through hole 2-41 is 0.1-1 mm larger than the outer diameter of the effective section 2-11 of the first forming mandrel.

[0047] The forming lower two punches 3 include a forming lower two punch base 3-1 and a forming lower two punch head 3-2 arranged at the upper end of the forming lower two punch base 3-1. The forming lower two punch base 3-1 is sequentially provided with a first cylinder 3-11 of the forming lower two punch base, a second cylinder 3-12 of the forming lower two punch base, and a third cylinder 3-13 of the forming lower two punch base from bottom to top. A first tooth surface 3-21 of the forming lower two punch and a second tooth surface 3-22 of the forming lower two punch are sequentially arranged on the outer side of the forming lower two punch head 3-2 from top to bottom. The second tooth surface 3-22 of the forming lower two punch is 0.1-0.5 mm smaller than the first tooth surface 3-21 of the forming lower two punch;

[0048] A forming lower two punch central through hole 3-5 is arranged at the center of the forming lower two punch 3. The forming lower two punch central through hole 3-5 includes a first round hole 3-3 of the forming lower two punch and a second round hole 3-4 of the forming lower two punch which are sequentially arranged from top to bottom. The first round hole 3-3 of the forming lower two punch cooperates with the effective section 2-11 of the first forming mandrel. The second round hole 3-4 of the forming lower two punch is 0.2-1 mm larger than the first round hole 3-3 of the forming lower two punch;

[0049] A plurality of forming lower secondary punch second mandrel through holes 3-14 are provided on the forming lower secondary punch base 3-1. The forming lower secondary punch second mandrel through holes 3-14 surround the center of the forming lower secondary punch 3 and penetrate through the first cylinder 3-11 of the forming lower secondary punch base, the second cylinder 3-12 of the forming lower secondary punch base and cooperate with the second forming mandrel 2-2. The diameter of the forming lower secondary punch second mandrel through hole 3-14 is 0.2 to 1 mm larger than the outer diameter of the effective section 2-21 of the second forming mandrel.

[0050] The forming first lower punch 4 includes a forming first lower punch base 4-1 and a forming first lower punch head 4-2 arranged in sequence from bottom to top. The forming first lower punch base 4-1 includes a first cylinder 4-11 of the forming first lower punch base and a second cylinder 4-12 of the forming first lower punch base arranged in sequence from bottom to top. A first tooth surface 4-21 of the forming first lower punch is provided on the outer side of the forming first lower punch head 4-2, and a second tooth surface 4-22 of the forming first lower punch is provided below the first tooth surface 4-21 of the forming first lower punch. The outer diameter of the second tooth surface 4-22 of the forming first lower punch is 0.1 to 0.5 mm smaller than that of the first tooth surface 4-21 of the forming first lower punch.

[0051] A forming first lower punch central through hole 4-5 is provided at the central part of the forming first lower punch 4. The forming first lower punch central through hole 4-5 includes a forming first lower punch tooth cavity 4-3 and a first round hole 4-4 of the forming first lower punch arranged in sequence from top to bottom. The forming first lower punch tooth cavity 4-3 is matched with the first tooth surface 3-21 of the forming lower secondary punch with a clearance of 0.01 to 0.02 mm. The diameter of the first round hole 4-4 of the forming first lower punch is 0.2 to 1 mm larger than that of the third cylinder 3-13 of the lower secondary punch base.

[0052] Around the center of the forming first lower punch 4, a lower punch forming second mandrel passing step difference hole 4-6 with the same number and pitch as the second forming mandrel 2-2 is provided. The lower punch forming second mandrel passing step difference hole 4-6 includes a forming first lower punch second round hole surface 4-61 with a clearance of 0.01 to 0.02 mm between the upper section and the effective section 2-21 of the second forming mandrel, and the lower section is a forming first lower punch third round hole surface 4-62 which is 0.2 to 1 mm larger than the forming first lower punch second round hole surface 4-61.

[0053] A forming female die cavity 5-1 with a clearance of 0.01 to 0.02 mm in matching with the first tooth surface 4-21 of the forming first lower punch is provided at the central part of the forming female die 5.

[0054] The upper first forming punch 6 includes an upper first forming punch base 6-1 and an upper first forming punch head 6-2 disposed on the upper first forming punch base 6-1. The upper first forming punch base 6-1 includes a first cylinder 6-11 of the upper first forming punch base and a second cylinder 6-12 of the upper first forming punch base disposed on the first cylinder 6-11 of the upper first forming punch base. A first tooth surface 6-21 and a second tooth surface 6-22 of the upper first forming punch are disposed on the outer side of the upper first forming punch head 6-2. The second tooth surface 6-22 of the upper first forming punch is disposed below the first tooth surface 6-21 of the upper first forming punch and the outer diameter is 0.1 - 0.5 mm smaller than that of the first tooth surface 6-21 of the upper first forming punch.

[0055] A central through hole 6-5 of the upper first forming punch 6 is provided at the central part. The central through hole 6-5 of the upper first forming punch includes a first round hole 6-3 and a second round hole 6-4 of the upper first forming punch arranged in sequence from top to bottom. The first round hole 6-3 of the upper first forming punch is assembled with the effective section 2-11 of the first forming mandrel with a clearance of 0.01 - 0.02 mm. The second round hole 6-4 of the upper first forming punch is 0.2 - 1 mm larger than the first round hole 6-3 of the upper first forming punch.

[0056] A plurality of second core rod passing stepped holes 6-6 for cooperating with the second forming mandrel 2-2 are arranged around the center of the upper first forming punch 6. The second core rod passing stepped hole 6-6 of the upper first forming punch includes a third round hole 6-61 and a fourth round hole 6-62 of the upper first forming punch arranged in sequence from top to bottom. The third round hole 6-61 of the upper first forming punch is assembled with the effective section 2-21 of the second forming mandrel with a clearance of 0.01 - 0.02 mm. The fourth round hole 6-62 of the upper first forming punch is 0.2 - 1 mm larger than the third round hole 6-61 of the upper first forming punch.

[0057] When assembling the forming mandrel 2, first place the installation base 2-13 of the first forming mandrel into the first forming mandrel installation cavity 2-31 that cooperates with it. Then, successively place the same number of installation bases 2-23 of the second forming mandrel as the weight reduction holes 1-4 in the double-link tooth 1 into the second forming mandrel installation cavity 2-32 that cooperates with them. Align the through hole 2-41 of the first forming mandrel and the through hole 2-42 of the second forming mandrel with the first forming mandrel 2-1 and the second forming mandrel 2-2 in sequence, and after aligning the locking countersunk hole 2-43 of the upper and lower covers of the forming mandrel and the locking threaded hole 2-34 of the upper and lower covers of the forming mandrel, put them on from top to bottom, and use the assembly screw 2-5 of the forming mandrel to lock and fix the forming mandrel base 2-3 and the upper cover 2-4 of the forming mandrel.

[0058] The outer diameter of the effective section 2-11 of the first forming mandrel matches the size of the mounting hole 1-3 in the double gear 1, and the outer diameter of the effective section 2-21 of the second forming mandrel matches the size of the weight-reducing hole 1-4 in the double gear 1. The pitch and quantity of the mounting cavities 2-32 of the second forming mandrel are the same as those of the weight-reducing holes 1-4 in the double gear 1. On the outer sides of the lower second punching punches 3-2, there are respectively a first tooth surface 3-21 of the lower second punching that conforms to the contour of the second tooth surface 1-21 of the case gear 1-2 in the double gear 1, and below the first tooth surface 3-21 of the lower second punching, there is a second tooth surface 3-22 of the lower second punching that is 0.1 - 0.5 mm smaller than the first tooth surface 3-21 of the lower second punching.

[0059] Specific assembly process of the powder metallurgy mold for producing double gears:

[0060] 1. First, lock the fixing studs 2-33 of the forming mandrel in the forming mandrel locking rod of the forming machine equipment.

[0061] 2. Pass the central through hole 3-5 of the lower second punching and the through hole 3-14 of the second core rod of the lower second punching in the lower second punching 3 through the first forming mandrel 2-1 and the second forming mandrel 2-2 respectively, and then lock them on the forming machine table.

[0062] 3. Pass the central through hole 4-5 of the upper first punching and the stepped hole 4-6 of the second core rod of the upper first punching in the upper first punching 4 from top to bottom through the lower second punching head 3-2 of the lower second punching 3 and the second forming mandrel 2-2 respectively, and then lock them on the forming machine equipment.

[0063] 4. Pass the cavity 5-1 of the female mold 5 from top to bottom through the upper first punching head 4-2 of the upper first punching, and then fix it on the forming machine equipment.

[0064] 5. Orient the upper first punching head 6-2 of the upper first punching 6 towards the female mold 5, and insert the upper first punching head 6-2, the central through hole 6-5 of the upper first punching, and the stepped hole 6-6 of the second core rod of the upper first punching into the cavity 5-1 of the female mold, the first forming mandrel 2-1, and the second forming mandrel 2-2 respectively, and then fix the upper first punching 6 on the forming machine equipment. After adjusting the forming machine equipment to the appropriate working position, the double gears can be pressed.

[0065] The powder metallurgy mold for producing double gears of the present utility model uses precise mold design to perform batch and continuous pressing of double gears. It not only reduces the defects formed by the errors of machine tools and equipment and tool wear in general traditional machining, but also greatly improves production efficiency and reduces raw material loss. In the current highly competitive industrial field, it can significantly reduce production costs and improve the company's competitiveness.

[0066] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered within the scope of the claims of the present invention.

Claims

1. A powder metallurgy mold for producing double-linked teeth, characterized in that: It comprises a forming core rod (2), a forming lower second punch (3), a forming lower punch (4), a forming female die (5), and a forming upper punch (6); The molding mandrel (2) comprises a first molding mandrel (2-1) and a second molding mandrel (2-2), wherein the first molding mandrel (2-1) is arranged at the center of the molding mandrel (2), and the second molding mandrel (2-2) surrounds the center of the molding mandrel (2) and is arranged at intervals on the outer periphery of the molding mandrel (2); a molding female mold cavity (5-1) is arranged at the center of the molding female mold (5); The first forming core rod (2-1) and the second forming core rod (2-2) pass through the forming lower punch (3), the forming lower punch (4), the forming female mold (5) and the forming upper punch (6) in sequence from bottom to top, and the forming lower punch (4) and the forming upper punch (6) are arranged in sequence from bottom to top in the forming female mold cavity (5-1).

2. The powder metallurgy mold for producing double teeth according to claim 1, characterized in that: The forming mandrel (2) further comprises a forming mandrel base (2-3) and a forming mandrel upper cover (2-4); the forming mandrel upper cover (2-4) is arranged on the forming mandrel base (2-3); the first forming mandrel (2-1) and the second forming mandrel (2-2) pass through the forming mandrel upper cover (2-4) and the forming mandrel base (2-3) in sequence and are fixed by means of forming mandrel assembly screws (2-5).

3. The powder metallurgy mold for producing double teeth according to claim 2, characterized in that: The first forming mandrel (2-1) comprises a first forming mandrel mounting seat (2-13), a first forming mandrel material escaping section (2-12) and a first forming mandrel effective section (2-11) which are arranged in sequence from bottom to top, the outer diameter of the first forming mandrel material escaping section (2-12) is 0.2 to 1 mm smaller than the outer diameter of the first forming mandrel effective section (2-11), and the outer diameter of the first forming mandrel mounting seat (2-13) is 6 to 10 mm larger than the first forming mandrel effective section (2-11); The second forming mandrel (2-2) comprises, from bottom to top, a second forming mandrel mounting seat (2-23), a second forming mandrel material escape section (2-22) and a second forming mandrel effective section (2-21); the outer diameter of the second forming mandrel material escape section (2-22) is 0.2 to 1 mm smaller than the outer diameter of the second forming mandrel effective section (2-21); and the outer diameter of the second forming mandrel mounting seat (2-23) is 6 to 10 mm larger than the outer diameter of the second forming mandrel effective section (2-21).

4. The powder metallurgy mold for producing double teeth according to claim 3, characterized in that: The forming mandrel base (2-3) comprises a first forming mandrel installation cavity (2-31) and a plurality of second forming mandrel installation cavities (2-32); the first forming mandrel installation cavity (2-31) is arranged at the center of the forming mandrel base (2-3) and cooperates with the first forming mandrel installation seat (2-13); the second forming mandrel installation cavity (2-32) surrounds the center of the forming mandrel base (2-3) and is arranged at the periphery of the forming mandrel base (2-3) and cooperates with the second forming mandrel installation seat (2-23); a forming mandrel fixing stud (2-33) that cooperates with the forming machine equipment is arranged at the bottom of the forming mandrel base (2-3), and a plurality of locking threaded holes (2-34) are arranged at the top of the forming mandrel base (2-3); A first forming mandrel through hole (2-41) cooperating with the first forming mandrel (2-1) is arranged at the center of the forming mandrel upper cover (2-4), a second forming mandrel through hole (2-42) cooperating with the second forming mandrel (2-2) is arranged at the periphery of the forming mandrel upper cover (2-4), and a locking countersunk hole (2-43) cooperating with the locking threaded hole (2-34) is also arranged on the forming mandrel upper cover (2-4), and the aperture of the first forming mandrel through hole (2-41) is 0.1 to 1 mm larger than the outer diameter of the effective section (2-11) of the first forming mandrel.

5. The powder metallurgy mold for producing double teeth according to claim 3, characterized in that: The lower second punch (3) comprises a lower second punch base (3-1) and a lower second punch punch head (3-2) arranged at the upper end of the lower second punch base (3-1); the lower second punch base (3-1) is provided with a first lower second punch base cylinder (3-11), a second lower second punch base cylinder (3-12) and a third lower second punch base cylinder (3-13) in sequence from bottom to top; the outer side of the lower second punch punch head (3-2) is provided with a first lower second punch tooth surface (3-21) and a second lower second punch tooth surface (3-22) in sequence from top to bottom; the second lower second punch tooth surface (3-22) is 0.1 to 0.5 mm smaller than the first lower second punch tooth surface (3-21); A central through hole (3-5) is arranged at the center of the lower second punch (3), and the central through hole (3-5) comprises a first circular hole (3-3) and a second circular hole (3-4) arranged in sequence from top to bottom. The first circular hole (3-3) cooperates with the effective section (2-11) of the first forming mandrel, and the second circular hole (3-4) is 0.2 to 1 mm larger than the first circular hole (3-3) of the lower second punch. A plurality of second core rod passing holes (3-14) for forming the lower second punch are arranged on the forming lower second punch base (3-1). The second core rod passing holes (3-14) for forming the lower second punch surround the center of the forming lower second punch (3) and penetrate the first cylinder (3-11) of the forming lower second punch base, the second cylinder (3-12) of the forming lower second punch base and cooperate with the second forming core rod (2-2). The diameter of the second core rod passing holes (3-14) for forming the lower second punch is 0.2 to 1 mm larger than the outer diameter of the effective section (2-21) of the second forming core rod.

6. The powder metallurgy mold for producing double teeth according to claim 5, characterized in that: The next punch (4) comprises a next punch base (4-1) and a next punch punch head (4-2) arranged in sequence from bottom to top, the next punch base (4-1) comprises a next punch base first cylinder (4-11) and a next punch base second cylinder (4-12) arranged in sequence from bottom to top, a next punch first tooth surface (4-21) and a next punch second tooth surface (4-22) arranged below the next punch first tooth surface (4-21) are arranged on the outer side of the next punch punch head (4-2), and the outer diameter of the next punch second tooth surface (4-22) is 0.1-0.5 mm smaller than the next punch first tooth surface (4-21); The center of the lower punch (4) is provided with a central through hole (4-5) for the lower punch, and the central through hole (4-5) for the lower punch comprises a tooth cavity (4-3) for the lower punch and a first circular hole (4-4) for the lower punch, which are arranged in sequence from top to bottom. The tooth cavity (4-3) for the lower punch is assembled with the first tooth surface (3-21) of the lower punch, and the clearance is 0.01-0.02 mm. The diameter of the first circular hole (4-4) for the lower punch is 0.2-1 mm larger than the third cylinder (3-13) of the lower punch base. Around the center of the next punch (4), the next punch second forming mandrel rod passing step difference holes (4-6) are arranged, the number and pitch of which are the same as those of the second forming mandrel rod (2-2); the next punch second forming mandrel rod passing step difference holes (4-6) include a next punch second circular hole surface (4-61) with a clearance of 0.01 to 0.02 mm between an upper section and an effective section (2-21) of the second forming mandrel rod, and a next punch third circular hole surface (4-62) with a size of 0.2 to 1 mm larger than the next punch second circular hole surface (4-61).

7. The powder metallurgy mold for producing double teeth according to claim 6, characterized in that: The central part of the female forming die (5) is provided with a female forming die cavity (5-1) with a clearance of 0.01-0.02 mm for assembly with the first tooth surface (4-21) of the next punch.

8. The powder metallurgy mold for producing double teeth according to claim 3, characterized in that: The upper forming punch (6) comprises an upper forming punch base (6-1) and an upper forming punch head (6-2) arranged on the upper forming punch base (6-1); the upper forming punch base (6-1) comprises an upper forming punch base first cylinder (6-11) and an upper forming punch base second cylinder (6-12) arranged on the upper forming punch base first cylinder (6-11); an upper forming punch first tooth surface (6-21) and an upper forming punch second tooth surface (6-22) are arranged on the outer side of the upper forming punch head (6-2); the upper forming punch second tooth surface (6-22) is arranged below the upper forming punch first tooth surface (6-21) and has an outer diameter that is 0.1 to 0.5 mm smaller than the upper forming punch first tooth surface (6-21); The central portion of the upper forming punch (6) is provided with a central through hole (6-5) of the upper forming punch, the central through hole (6-5) of the upper forming punch comprising a first circular hole (6-3) of the upper forming punch and a second circular hole (6-4) of the upper forming punch which are arranged in sequence from top to bottom, the first circular hole (6-3) of the upper forming punch is assembled with the effective section (2-11) of the first forming mandrel and the clearance is 0.01-0.02 mm, and the second circular hole (6-4) of the upper forming punch is 0.2-1 mm larger than the first circular hole (6-3) of the upper forming punch; A plurality of upper forming punch second core rod passing step difference holes (6-6) are arranged around the center of the upper forming punch (6) and cooperate with the second forming core rod (2-2). The upper forming punch second core rod passing step difference holes (6-6) include an upper forming punch third circular hole (6-61) and an upper forming punch fourth circular hole (6-62) arranged in sequence from top to bottom. The upper forming punch third circular hole (6-61) is assembled with the second forming core rod effective section (2-21) and the clearance is 0.01-0.02 mm. The upper forming punch fourth circular hole (6-62) is 0.2-1 mm larger than the upper forming punch third circular hole (6-61).

Images