Face gear forming die

Abstract

The utility model discloses a face gear forming die. Comprising a face gear and a forming die, the face gear comprises a plurality of holes, a shaft hole, gear teeth, a hub and a rim, the forming die comprises an upper inner punch, an upper outer punch, a middle die, a first lower punch, a second lower punch, a third lower punch and a core rod which are sequentially arranged from top to bottom, a cavity is formed in the middle of the middle die, and a first vertical through hole corresponding to the position of the shaft hole is formed in the middle of the upper inner punch; the upper inner punch is provided with a plurality of second vertical through holes corresponding to the holes, the top of the second lower punch is provided with a male die corresponding to the second vertical through holes, the male die extends into the second vertical through holes, the bottom of the upper inner punch and the bottom of the lower inner punch jointly form an upper cavity wall, and the top of the first lower punch, the top of the second lower punch and the top of the third lower punch jointly form a lower cavity wall. The outer wall of the male die and the outer wall of the core rod jointly form an inner cavity wall, and the upper cavity wall, the lower cavity wall, the inner cavity wall and the cavity jointly form a die cavity of the face gear. Integrated forming of the face gear is achieved, and production efficiency is improved.

Description

Technical Field

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

[0002] With the rapid development of industry and the intensification of competition in the international market, higher requirements have been placed on gear production, quality accuracy, production costs, and environmental protection. This has led to the development of gear processing towards high efficiency, high precision, and environmentally friendly products. On the one hand, while traditional tooth cutting methods such as gear shaping, shaving, hobbing, and grinding can produce products with good surface quality and high dimensional accuracy, they require each tooth profile to be processed individually on dedicated machine tools. This leads to problems such as poor equipment versatility, low material utilization, and low production efficiency. In addition, the metal flow lines of the product are cut off, which reduces the service life of the gear.

[0003] There is an urgent need to design a face gear forming die and manufacture face gears by powder metallurgy forming method to improve the production efficiency of face gears. Utility Model Content

[0004] The purpose of the utility model is to provide a face gear forming die with integrated forming and greatly improved production efficiency in view of the deficiencies in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a face gear forming die, comprising a face gear and a forming die, the face gear comprising a plurality of holes, an axial hole, gear teeth, a wheel hub, and a wheel rim, characterized in that the forming die comprises an upper inner punch, an upper outer punch, a middle die, a lower punch, a lower second punch, a lower third punch, and a core rod arranged in sequence from top to bottom, a cavity is provided in the middle of the middle die, the bottom of the upper outer punch extends into the cavity, a gear tooth groove corresponding to the gear teeth is provided at the bottom of the upper outer punch, a first axial through hole is provided in the middle of the upper outer punch, the upper inner punch is inserted into the first axial through hole, and the bottom of the upper inner punch extends into the cavity, a first vertical through hole corresponding to the position of the axial hole is provided in the middle of the upper inner punch, and the upper inner punch is provided with a plurality of second vertical through holes corresponding to the holes;

[0006] The top of the next punch extends into the mold cavity, and the top of the next punch is set corresponding to the shape of the wheel rim. A second axial through hole is provided in the middle of the next punch, and the lower two punches are inserted into the second axial through hole. A punch corresponding to the second vertical through hole is provided on the top of the lower two punches, and the punch extends into the second vertical through hole. A third axial through hole is provided in the middle of the lower two punches, and the diameter of the third axial through hole is equal to the outer diameter of the hub. The lower three punches are inserted into the third axial through hole, and the height difference between the top of the lower three punches and the top of the lower two punches is equal to the height of the hub. A fourth axial through hole is provided in the middle of the lower three punches, and the diameter of the fourth axial through hole is equal to the inner diameter of the hub. The top of the lower three punches is set corresponding to the end face shape of the hub, and the core rod is inserted into the fourth axial through hole, and the core rod is inserted corresponding to the first vertical through hole.

[0007] The bottom of the upper inner punch and the bottom of the lower inner punch together form the upper cavity wall, the top of the lower punch, the top of the lower second punch, and the top of the lower third punch together form the lower cavity wall, the outer wall of the punch and the outer wall of the core rod together form the inner cavity wall, and the upper cavity wall, lower cavity wall, inner cavity wall and cavity together form the mold cavity of the face gear.

[0008] Preferably, the upper outer punch is provided with radial exhaust holes.

[0009] Preferably, the first axial through hole and the second axial through hole correspond in upper and lower positions and have the same size.

[0010] Preferably, the inner wall of the gear tooth groove is chamfered obliquely inward.

[0011] Preferably, the turning edge of the punch is rounded.

[0012] Compared with the existing technology, the utility model has the following advantages: the utility model realizes the one-piece molding die design of the face gear, utilizes the cooperation of the upper inner punch and the lower two punches to accurately position the shaft hole and the hole of the face gear, and provides a chamfer obliquely inward on the inner wall of the gear tooth groove, which facilitates the removal of the die and reduces the burrs generated after molding. The production efficiency of the face gear is greatly improved through the one-piece molding of powder metallurgy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an axonometric drawing of the present utility model.

[0014] Figure 2 It is a cross-sectional view of the present utility model.

[0015] Figure 3 It is an explosion diagram of the utility model.

[0016] Figure 4 It is an axonometric drawing of the upper inner punch of the utility model.

[0017] Figure 5 It is an axonometric drawing of the upper outer punch of the utility model.

[0018] Figure 6 It is an axonometric drawing of the lower punch in the utility model.

[0019] Figure 7 It is an axonometric drawing of the lower two punches of the utility model.

[0020] Figure 8 It is an axonometric drawing of the lower three punches of the utility model.

[0021] Figure 9 This is the first axonometric drawing of the face gear of the present invention.

[0022] Figure 10This is the second axonometric drawing of the face gear of the present invention.

[0023] Among them, 1-middle die, 11-cavity, 2-upper outer punch, 21-first axial through hole, 22-gear tooth groove, 23-exhaust hole, 3-upper inner punch, 31-first vertical through hole, 32-second vertical through hole, 4-lower punch, 41-second axial through hole, 5-lower second punch, 51-third axial through hole, 52-punch, 6-lower third punch, 61-fourth axial through hole, 7-core rod, 81-hole, 82-gear tooth, 83-shaft hole, 84-hub, 85-rim. DETAILED DESCRIPTION

[0024] The present invention is further illustrated below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0025] like Figures 1 to 5 The face gear forming die shown includes a face gear and a forming die, as shown in FIG. Figures 9 and 10 The face gear shown includes a plurality of holes 81, an axial hole 83, gear teeth 82, a hub 84, and a rim 85. The holes 81 are arranged around the circumference of the axial hole 83. The forming mold includes an upper inner punch 3, an upper outer punch 2, a middle mold 1, a lower punch 4, a lower second punch 5, a lower third punch 6, and a core rod 7, which are arranged in sequence from top to bottom. A cavity 11 is provided in the middle of the middle mold 1. The bottom of the upper outer punch 2 extends into the cavity 11. The bottom of the upper outer punch 2 is provided with a gear tooth 82-shaped groove 22 corresponding to the gear tooth 82. The inner wall of the gear tooth 82-shaped groove 22 is provided with a chamfered angle inward, and the chamfered angle is provided in the center. The corner edges are further rounded to facilitate demoulding and reduce burrs. The upper outer punch 2 is provided with radial exhaust holes 23. The exhaust holes 23 connect the cavity between the upper inner punch 3 and the upper outer punch 2 to facilitate the upper inner punch 3 to enter the upper outer punch 2. A first axial through hole 21 is provided in the middle of the upper outer punch 2. The upper inner punch 3 is inserted into the first axial through hole 21, and the bottom of the upper inner punch 3 extends into the cavity 11. A first vertical through hole 31 corresponding to the position of the axial hole 83 is provided in the middle of the upper inner punch 3, and the upper inner punch 3 is provided with a number of second vertical through holes 32 corresponding to the holes 81.

[0026] like Figures 6 to 8As shown, the top of the next punch 4 extends into the cavity 11, and the top of the next punch 4 is set corresponding to the shape of the wheel rim 85. A second axial through hole 41 is provided in the middle of the next punch 4. The lower second punch 5 is inserted into the second axial through hole 41. A punch 52 corresponding to the second vertical through hole 32 is provided on the top of the lower second punch 5. The turning edge of the punch 52 is rounded. The punch 52 extends into the second vertical through hole 32. A third axial through hole 51 is provided in the middle of the lower second punch 5. The diameter of the third axial through hole 51 is equal to the outer diameter of the hub 84. The lower three punches 6 are inserted into the third axial through hole 51. The height difference between the top of the lower three punches 6 and the top of the lower two punches 5 is equal to the height of the hub 84. A fourth axial through hole 61 is provided in the middle of the lower three punches 6. The diameter of the fourth axial through hole 61 is equal to the inner diameter of the hub 84. The top of the lower three punches 6 is set to correspond to the end face shape of the hub 84. The core rod 7 is inserted into the fourth axial through hole 61, and the core rod 7 is inserted corresponding to the first vertical through hole 31; the first axial through hole 21 and the second axial through hole 41 correspond to each other in upper and lower positions and have the same size.

[0027] The bottom of the upper inner punch 3 and the bottom of the lower inner punch together form the upper cavity wall, the top of the lower punch 4, the top of the lower second punch 5, and the top of the lower third punch 6 together form the lower cavity wall, the outer wall of the punch 52 and the outer wall of the core rod 7 together form the inner cavity wall, and the upper cavity wall, the lower cavity wall, the inner cavity wall and the cavity 11 together form the mold cavity of the face gear.

[0028] The working process and principle of the utility model are as follows: the core rod 7 is inserted into the lower three punches 6, the lower two punches 5, the next punch 4, the middle die 1 and the upper inner punch 3 in sequence, and the material is filled into the cavity 11. The core rod 7 partially forms the shaft hole 83, the upper inner punch 3 and the lower two punches 5 cooperate to form the hole 81, the upper outer punch 2 cooperates with the next punch to form the gear teeth 82 and the wheel rim 85, and the lower three punches 6 cooperate with the upper inner punch 3 to form the wheel hub 84. It is stamped and formed in one time, with high structural strength and high production efficiency.

[0029] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge of the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A face gear forming die, comprising a face gear and a forming die, wherein the face gear comprises a plurality of holes, an axial hole, gear teeth, a hub, and a rim, and is characterized in that: The forming die includes an upper inner punch, an upper outer punch, a middle die, a lower punch, a lower second punch, a lower third punch and a core rod, which are arranged in sequence from top to bottom. A cavity is provided in the middle of the middle die, the bottom of the upper outer punch extends into the cavity, the bottom of the upper outer punch is provided with a gear tooth groove corresponding to the gear teeth, a first axial through hole is provided in the middle of the upper outer punch, the upper inner punch is inserted into the first axial through hole, and the bottom of the upper inner punch extends into the cavity, a first vertical through hole corresponding to the position of the axial hole is provided in the middle of the upper inner punch, and the upper inner punch is provided with a plurality of second vertical through holes corresponding to the holes; The top of the next punch extends into the mold cavity, and the top of the next punch is set corresponding to the shape of the wheel rim. A second axial through hole is provided in the middle of the next punch, and the lower two punches are inserted into the second axial through hole. A punch corresponding to the second vertical through hole is provided on the top of the lower two punches, and the punch extends into the second vertical through hole. A third axial through hole is provided in the middle of the lower two punches, and the diameter of the third axial through hole is equal to the outer diameter of the hub. The lower three punches are inserted into the third axial through hole, and the height difference between the top of the lower three punches and the top of the lower two punches is equal to the height of the hub. A fourth axial through hole is provided in the middle of the lower three punches, and the diameter of the fourth axial through hole is equal to the inner diameter of the hub. The top of the lower three punches is set corresponding to the end face shape of the hub, and the core rod is inserted into the fourth axial through hole, and the core rod is inserted corresponding to the first vertical through hole. The bottom of the upper inner punch and the bottom of the lower inner punch together form the upper cavity wall, the top of the lower punch, the top of the lower second punch, and the top of the lower third punch together form the lower cavity wall, the outer wall of the punch and the outer wall of the core rod together form the inner cavity wall, and the upper cavity wall, lower cavity wall, inner cavity wall and cavity together form the mold cavity of the face gear.

2. The face gear forming die according to claim 1, wherein: The upper outer punch is provided with radial exhaust holes.

3. The face gear forming die according to claim 1, wherein: The first axial through hole and the second axial through hole correspond to each other in vertical position and have the same size.

4. The face gear forming die according to claim 1, wherein: The inner wall of the gear tooth groove is provided with a chamfer obliquely inwardly.

5. The face gear forming die according to claim 1, wherein: The turning edge of the punch is rounded.

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