Gear punching die

Abstract

The utility model discloses a stamping die for gear, including lower die seat body, be equipped with lower die kernel block in the inner chamber of lower die seat body, the upper portion of lower die kernel block is sequentially stacked with middle die kernel block and upper die kernel block and set, lower die kernel block, middle die kernel block and upper die kernel block all are equipped with the positioning through -hole of corresponding each other, be equipped with the positioning rod in the positioning through -hole, the middle part of lower die kernel block is equipped with the ejection through -hole with the coaxial corresponding of forming through -hole, be equipped with the ejector rod in the ejection through -hole, the upper portion of lower die seat body is equipped with punch assembly. The process of gear processing, the stress concentration phenomenon is remarkable to the existing integral mould, causes the partial stress to be easy to exceed the fatigue limit of mould material, causes the tooth profile area early cracking or plastic deformation, mould life is reduced significantly, and the problem that frequent replacement integral mould not only increases production cost, also influences production continuity.

Description

Technical Field

[0001] This utility model relates to the field of gear processing technology, and more specifically, to a stamping die for gears. Background Technology

[0002] Gears, as core components of mechanical transmission systems, are widely used in automobiles, aerospace, and construction machinery. Their forming accuracy and production efficiency directly affect the stability of the entire machine's operation and manufacturing costs.

[0003] In the gear manufacturing process, when using cold extrusion to form gears, a blank with a diameter close to the tip circle of the gear teeth is usually placed into the mold cavity. Pressure is applied by a punch to make the metal flow and fill the tooth profile. In the high-stroke cold extrusion process, some existing integral molds have a simple structure and significant stress concentration, which makes the local stress easily exceed the fatigue limit of the mold material, causing early cracking or plastic deformation in the tooth area. The mold life is significantly reduced, and frequent replacement of integral molds not only increases production costs but also affects production continuity.

[0004] To address the aforementioned problems, this application proposes a stamping die for gears. Utility Model Content

[0005] To address the problems in related technologies, this utility model provides a gear stamping die that can avoid stress damage to the die through a three-section split die core structure, and does not require replacement of the whole die during maintenance, thereby reducing production costs and ensuring production continuity.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: A gear stamping die includes a lower die base, a lower die core block is provided in the inner cavity of the lower die base, and a middle die core block and an upper die core block are stacked sequentially above the lower die core block; the lower die core block, the middle die core block and the upper die core block are all provided with corresponding positioning through holes, and positioning rods are inserted through the positioning through holes; a forming through hole is provided in the middle of the middle die core block, and an ejection through hole is provided in the middle of the lower die core block, which is coaxial with the forming through hole, and an ejection rod is provided in the ejection through hole; a punch assembly is provided above the lower die base for cooperating with the upper die core block, the middle die core block and the lower die core block to stamp and form the blank.

[0007] As a further embodiment of this utility model, the punch assembly includes an upper die base, and a punch body is provided in the inner cavity of the upper die base. The shape of the punch body is adapted to the cavity formed by the upper die core block, the middle die core block and the lower die core block, so as to ensure that the metal blank can be uniformly filled with the tooth shape.

[0008] As a further embodiment of this utility model, an upper equipment base is bolted to the upper end of the upper mold base body to facilitate installation with the upper mold base body; a limit block is provided at the bottom of the upper mold base body to control the mold closing depth and prevent over-rushing.

[0009] As a further embodiment of this utility model, the lower mold core block, the middle mold core block, and the upper mold core block are each provided with two positioning through holes, which are symmetrically distributed along the center of the mold to provide balanced and stable positioning guidance.

[0010] As a further embodiment of this utility model, a lower equipment base is fixedly installed at the bottom of the lower mold base body by bolts, which facilitates the installation of the lower mold base body and the equipment; a clearance through hole is opened in the middle of the lower equipment base for the ejector rod to pass through.

[0011] As a further embodiment of this utility model, the bottom end of the ejector rod is connected to an external drive mechanism to achieve smooth ejection of the formed gear workpiece and improve production efficiency.

[0012] The beneficial effects of this utility model are as follows: This invention utilizes a three-section (lower, middle, and upper) split mold core design to effectively disperse concentrated stress during high-stroke stamping, significantly improving mold life. Individual mold cores can be replaced after wear, greatly reducing maintenance costs and downtime. Precise alignment and guidance are achieved between the mold cores via positioning rods, ensuring concentricity and forming accuracy of the gear cavity. Simultaneously, the ejector rod can be connected to an external drive mechanism for automatic ejection. Combined with the upper and lower equipment bases, this makes mold installation and operation more convenient, improving production efficiency and stability. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a gear stamping die according to an embodiment of the present utility model; Figure 2 This is an exploded view of the overall structure of a gear stamping die according to an embodiment of the present utility model; Figure 3 This is a schematic cross-sectional view of the lower die holder and upper die holder of a gear stamping die according to an embodiment of the present utility model. Figure 4 This is a schematic diagram of the ejector rod of a gear stamping die in use according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of a limiting block for a gear stamping die according to an embodiment of the present utility model.

[0015] In the picture: 1. Lower die base; 2. Lower die core block; 3. Middle die core block; 4. Upper die core block; 5. Positioning through hole; 6. Positioning rod; 7. Forming through hole; 8. Ejection through hole; 9. Ejection rod; 10. Punch assembly; 101. Upper die base; 102. Punch body; 103. Upper equipment base; 104. Limiting block; 11. Lower equipment base; 12. Clearance through hole. Detailed Implementation

[0016] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0017] According to an embodiment of the present invention, a stamping die for gears is provided.

[0018] Please refer to the instruction manual appendix. Figure 1-5 According to an embodiment of the present invention, a gear stamping die includes a lower die base 1, a lower die core block 2 is provided in the inner cavity of the lower die base 1, and a middle die core block 3 and an upper die core block 4 are stacked sequentially above the lower die core block 2; the lower die core block 2, the middle die core block 3 and the upper die core block 4 are all provided with corresponding positioning through holes 5, and positioning rods 6 pass through the positioning through holes 5; a forming through hole 7 is provided in the middle of the middle die core block 3, and an ejection through hole 8 is provided in the middle of the lower die core block 2, which is coaxial with and corresponds to the forming through hole 7. The mold has an ejector rod 9 inside, the bottom end of which is connected to an external drive mechanism. A punch assembly 10 is provided above the lower mold base 1 for cooperating with the upper mold core block 4, the middle mold core block 3 and the lower mold core block 2 to stamp the blank. The lower mold core block 2, the middle mold core block 3 and the upper mold core block 4 each have two positioning through holes 5, which are symmetrically distributed along the center of the mold. The bottom of the lower mold base 1 is fixedly installed with a lower equipment base 11 by bolts. The lower equipment base 11 has a clearance through hole 12 in the middle for the ejector rod 9 to pass through.

[0019] The three-section, split mold core design (lower, middle, and upper sections) effectively disperses concentrated stress during high-stroke stamping, significantly improving mold life. Individual mold cores can be replaced after wear, greatly reducing maintenance costs and downtime. Precise alignment and guidance are achieved between the mold cores via positioning rods 6, ensuring concentricity and forming accuracy of the gear cavity. Simultaneously, the ejector rod 9 can be connected to an external drive mechanism for automatic ejection. Combined with the upper equipment base 103 and lower equipment base 11, mold installation and operation are more convenient, improving production efficiency and stability.

[0020] The upper surface of the lower mold core block 2 is precision machined to support the middle mold core block 3; the upper surface of the middle mold core block 3 is also precision machined to support the upper mold core block 4, thus forming a layered structure from bottom to top.

[0021] The ejector rod 9 can slide up and down in the ejector through hole 8. Its bottom end passes through the clearance through hole 12 of the lower equipment seat 11 and is used to connect with the external drive mechanism. After the gear extrusion molding, the external drive mechanism pushes the ejector rod 9 to move upward and smoothly eject the molded workpiece from the cavity.

[0022] In one embodiment, please refer to the appendix to the specification. Figure 3 , Figure 4 and Figure 5 The punch assembly 10 includes an upper die base 101, and a punch body 102 is provided in the inner cavity of the upper die base 101. The shape of the punch body 102 is adapted to the cavity formed by the upper die core block 4, the middle die core block 3, and the lower die core block 2. An upper equipment base 103 is bolted to the upper end of the upper die base 101, and a limit block 104 is provided at the bottom of the upper die base 101. During operation, the punch body 102 moves downward until it extends into the cavity formed by the upper die core block 4, the middle die core block 3, and the lower die core block 2 to process the blank in the cavity.

[0023] Workflow: During use, the pre-made gear blank is first placed into the ejector hole 8 of the lower die block 2. Then, the punch assembly 10 moves downwards under the action of the machine tool until the punch body 102 contacts the blank, pushing it into the closed cavity formed by the three die blocks for cold extrusion molding. During this process, the limiting block 104 ensures the mold is properly closed. After molding, the punch body 102 retracts. At this time, the external drive mechanism activates, pushing the ejector rod 9 upwards to eject the molded gear workpiece, completing demolding. The ejector rod 9 then resets, preparing for the next work cycle. When the mold becomes worn or damaged after long-term use, maintenance personnel only need to remove the positioning rod 6 to remove each die block in sequence, replace the damaged die block, and reassemble to complete the repair; there is no need to replace the entire mold base or die assembly.

[0024] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A stamping die for gears, comprising a lower die base (1), characterized in that: The lower die base (1) has a lower die core block (2) in its inner cavity. A middle die core block (3) and an upper die core block (4) are stacked on top of the lower die core block (2). The lower die core block (2), the middle die core block (3) and the upper die core block (4) are all provided with corresponding positioning through holes (5). A positioning rod (6) is inserted through the positioning through hole (5). A forming through hole (7) is provided in the middle of the middle die core block (3). An ejection through hole (8) is provided in the middle of the lower die core block (2) and is coaxial with the forming through hole (7). An ejection rod (9) is provided in the ejection through hole (8). A punch assembly (10) is provided above the lower die base (1) for cooperating with the upper die core block (4), the middle die core block (3) and the lower die core block (2) to stamp the blank.

2. The gear stamping die according to claim 1, characterized in that: The punch assembly (10) includes an upper die base (101), and a punch body (102) is provided in the inner cavity of the upper die base (101). The shape of the punch body (102) is adapted to the cavity formed by the upper die core block (4), the middle die core block (3) and the lower die core block (2).

3. A gear stamping die according to claim 2, characterized in that: The upper end of the upper mold base (101) is bolted with an upper equipment base (103), and the bottom of the upper mold base (101) is provided with a limit block (104).

4. A gear stamping die according to claim 1, characterized in that: The lower mold core block (2), the middle mold core block (3) and the upper mold core block (4) each have two positioning through holes (5), which are symmetrically distributed along the center of the mold.

5. A gear stamping die according to claim 1, characterized in that: The bottom of the lower mold base (1) is fixedly installed with a lower equipment base (11) by bolts, and the lower equipment base (11) has a clearance through hole (12) in the middle for the ejector rod (9) to pass through.

6. A gear stamping die according to claim 1, characterized in that: The bottom end of the ejector rod (9) is connected to the external drive mechanism for transmission.

Images