Forging die for semi-finished driving and driven wheels of automobile intermediate axle

Abstract

The utility model relates to the technical field of gear dies, in particular to an automobile intermediate axle driving and driven wheel semi-finished product forging die. Comprising an upper mold and a lower mold, an annular outer mold is attached to the outer side of the lower mold, a conical tooth part is arranged in the middle of the top face of the lower mold, the lower portion of the upper mold is slidably inserted into the outer mold, and a positioning clamping table abutting against the top face of the outer mold is annularly arranged in the middle of the side face of the upper mold; the top of the stand column abuts against the center of the bottom face of the upper die, an annular groove is formed in the periphery of the bottom face of the upper die, and a combination tooth groove is formed in the bottom face of the upper die and located on the periphery of the stand column. The descending distance of the upper die is controlled through the positioning clamping table, the coaxiality of the two ends of a forged driving and driven wheel semi-finished product is guaranteed through the outer die, the forged driving and driven wheel semi-finished product avoids flash, and the machining cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gear moulds, in particular to a semi-finished forging mould for driving and driven wheels of a central axle of an automobile. Background Art

[0002] At present, the design structure of domestic heavy-duty truck axles adopts a triple-tooth transmission in the middle bridge. One end of the master and driven wheel products in the middle bridge is a bevel tooth, and the other end is a coupling tooth. The master and driven wheels of traditional automobile middle bridges are made of semi-finished products by open die forging on a friction press. The coupling teeth and the cylindrical teeth on the periphery of the semi-finished products are machined later. Friction presses are traditionally used for production, but the coaxiality of the two ends of the semi-finished products produced by the friction press cannot be well guaranteed, and the master and driven wheel semi-finished products produced by the friction press may also have flash, which needs to be processed later, increasing the processing cost. Utility Model Content

[0003] The utility model aims to solve the above problems, thereby providing a semi-finished forging die for the driving and driven wheels of a central axle of an automobile without flash.

[0004] The utility model solves the above problems and adopts the following technical solutions:

[0005] A semi-finished forging die for driving and driven wheels of a central axle of an automobile comprises an upper die and a lower die, an annular outer die is fitted on the outer side of the lower die, a bevel tooth portion is provided in the middle of the top surface of the lower die, a concave ring is provided on the top surface of the lower die and located at the outer periphery of the bevel tooth portion, the lower portion of the upper die is slidably inserted in the outer die, and a positioning clamping table abutting against the top surface of the outer die is provided in the middle of the side surface of the upper die along the annular direction, a column passes through the center position of the lower die, the top of the column abuts against the center of the bottom surface of the upper die, an annular groove is provided on the outer periphery of the bottom surface of the upper die, and a coupling tooth groove is provided on the bottom surface of the upper die and located at the outer periphery of the column.

[0006] Compared with the prior art, the utility model adopting the above technical solution has the following outstanding features:

[0007] After the preformed blank is placed in the mold cavity, the preformed blank falls down along the inner wall of the outer mold to the top of the lower mold, and the upper mold descends and the position of the upper mold is limited by the positioning clamp. Not only the downward distance of the upper mold is controlled by the positioning clamp, but also the coaxiality of the two ends of the forged master and slave wheel semi-finished products is ensured by the outer mold. The forged master and slave wheel semi-finished products avoid the generation of flash and reduce the processing cost.

[0008] Preferably, a further technical solution of the present invention is:

[0009] Furthermore, a limiting ring is arranged at the outer periphery of the bottom of the side surface of the lower mold, and a limiting groove used in conjunction with the limiting ring is opened at the bottom of the inner side surface of the outer mold.

[0010] Furthermore, the inner side of the top of the outer mold is arc-shaped. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main cross-sectional structure of an embodiment of the utility model;

[0012] Figure 2 This is a schematic structural diagram of the semi-finished product of the master and driven wheels combined with the tooth side in the embodiment of the utility model;

[0013] Figure 3 This is a schematic structural diagram of the semi-finished bevel tooth side of the master and driven wheels in an embodiment of the utility model;

[0014] The figures are marked as follows: upper mold 1, positioning clamping table 11, annular groove 12, engaging tooth groove 13, lower mold 2, conical tooth portion 21, limiting ring 22, outer mold 3, column 4, master and slave wheel semi-finished product 5. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0016] A semi-finished forging die for a driving and driven wheel of a mid-bridge of an automobile comprises an upper die 1 and a lower die 2. An annular outer die 3 is fitted on the outer side of the lower die 2. A bevel gear portion 21 is provided in the middle of the top surface of the lower die 2. The bevel gear portion 21 is used to forge the bevel gear portion of the driving and driven wheel semi-finished product 5. A concave ring is provided on the top surface of the lower die 2 and located at the outer periphery of the bevel gear portion 21. The lower part of the upper die 1 is slidably inserted in the outer die 3. The side surface of the lower part of the upper die 1 is slidably fitted with the inner wall of the outer die 3. The middle part of the side surface of the upper die 1 is provided along the annular direction. There is a positioning clamping table 11 which is against the top surface of the outer mold 3, and a column 4 is passed through the center position of the lower mold 2. The top of the column 4 is against the center of the bottom surface of the upper mold 1. An annular groove 12 is provided on the outer periphery of the bottom surface of the upper mold 1, and a coupling tooth groove 13 is provided on the bottom surface of the upper mold 1 and located on the outer periphery of the column 4. The coupling tooth groove 13 is used to forge the coupling tooth blank part of the master and slave wheel semi-finished product 5. The outer mold 3 ensures coaxiality and prevents the generation of flash. The master and slave wheel semi-finished product 5 and the part adjacent to the inner wall of the outer mold 3 form a cylindrical tooth blank part.

[0017] Furthermore, a limiting ring 22 is provided at the bottom periphery of the side surface of the lower mold 2, and a limiting groove for use with the limiting ring 22 is opened at the bottom of the inner side surface of the outer mold 3. The limiting ring 22 and the limiting groove cooperate to limit the position of the outer mold 3.

[0018] Furthermore, the inner side of the top of the outer mold 3 is arc-shaped, which facilitates the entry of the upper mold 1.

[0019] After the preformed blank is placed in the mold cavity, the preformed blank falls down along the inner wall of the outer mold to the top of the lower mold, and the upper mold descends and the position of the upper mold is limited by the positioning clamp. Not only the downward distance of the upper mold is controlled by the positioning clamp to ensure the accuracy, but also the coaxiality of the two ends of the forged master and slave wheel semi-finished products is ensured by the outer mold. The forged master and slave wheel semi-finished products avoid the generation of flash and reduce the processing cost.

[0020] The above description is only a preferred feasible embodiment of the present utility model, and does not limit the scope of rights of the present utility model. All equivalent changes made using the contents of the present utility model specification and its drawings are included in the scope of rights of the present utility model.

Claims

1. A semi-finished forging die for the driving and driven wheels of a central axle of an automobile, comprising an upper die and a lower die, characterized in that: An annular outer mold is fitted on the outer side of the lower mold, a conical tooth portion is provided in the middle of the top surface of the lower mold, a concave ring is provided on the top surface of the lower mold and located at the outer periphery of the conical tooth portion, the lower part of the upper mold is slidably inserted in the outer mold, and a positioning clamping table that abuts against the top surface of the outer mold is provided in the middle of the side surface of the upper mold along the annular direction, a column passes through the center position of the lower mold, the top of the column abuts against the center of the bottom surface of the upper mold, an annular groove is provided on the outer periphery of the bottom surface of the upper mold, and a combining tooth groove is provided on the bottom surface of the upper mold and located at the outer periphery of the column.

2. The semi-finished forging die for the driving and driven wheels of the automobile center axle according to claim 1 is characterized in that: A limiting ring is arranged at the outer periphery of the bottom of the side surface of the lower mold, and a limiting groove used in conjunction with the limiting ring is opened at the bottom of the inner side surface of the outer mold.

3. The semi-finished forging die for the driving and driven wheels of the automobile center axle according to claim 1 is characterized in that: The inner side of the top of the outer mold is curved.

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