A device for compound forging of bevel gears

Abstract

The utility model is suitable for gear forging field provides a kind of for driving bevel gear compound forging device, for the compound forging processing of forging blank, including lower mould and upper mould;The lower mould includes: lower outer mould;Lower inner mould, the lower inner mould is assembled in lower outer mould by interference fit;Two first radiating cavities, the lower inner mould is also fixed and is equipped with multiple intercommunication cavities one connecting two first radiating cavities;Two connecting heads.The utility model passes through the built-in "S" shape first radiating cavity cooperation gas circulation system, can be forced cooling to lower mould while forging, effectively controls mould working temperature, avoids high-temperature forging blank to make lower mould produce thermal fatigue and hardness drop and other problems, to greatly slow down mould loss, prolong the service life of mould, also effectively avoid the problem that the size of forging is unstable, surface defect or internal organization is bad etc. caused by mould temperature excessively high or fluctuation excessively big, help to produce higher quality, consistent performance bevel gear product.

Description

Technical Field

[0001] This utility model belongs to the field of gear forging, and in particular relates to a composite forging device for active bevel gears. Background Technology

[0002] The driving bevel gear, commonly known as a "corner gear," is a gear in a bevel gear transmission system (most commonly found in automotive drive axles) that receives power input and drives the driven bevel gear. Driving bevel gears are typically small in size, have fewer teeth, and are connected to the gearbox output via a long, thin drive shaft.

[0003] In traditional forging, the high-temperature forging billet is in continuous contact with the die, causing the die temperature (especially the cavity) to rise sharply. Repeated thermal cycling will generate thermal stress in the die material, which will lead to problems such as thermal fatigue cracks, decreased hardness and permanent deformation, ultimately causing the die to fail rapidly.

[0004] In modern composite forging, it is usually necessary to stop the machine and wait for it to cool naturally or to use external spray cooling. This usually interrupts the production process, reduces production efficiency, and external cooling may introduce rapid heating and cooling, which may increase the risk of mold cracking. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a composite forging device for active bevel gears, which aims to solve the problems mentioned in the background art.

[0006] This utility model embodiment is implemented as follows: a composite forging device for active bevel gears, used for composite forging processing of forging blanks, includes a lower die and an upper die, wherein the lower die and the upper die are fixedly provided with cavities on adjacent surfaces corresponding to the size of the forging blank; The lower mold includes: Lower outer mold; The lower inner mold is assembled inside the lower outer mold by an interference fit. The two first heat dissipation cavities are composed of heat dissipation groove 1 on both sides of the inner wall of the lower outer mold and heat dissipation groove 2 on both sides of the lower inner mold, arranged in an "S" shape. The lower inner mold also has a plurality of connecting cavities 1 that connect the two first heat dissipation cavities. Two connectors are fixedly installed on the side of the lower outer mold, and are respectively connected to one end of the two first heat dissipation cavities and connected to the external gas circulation system through pipes.

[0007] As a further aspect of this utility model: the upper mold includes: Upper outer mold; The upper inner mold is assembled inside the upper outer mold by an interference fit. The two second heat dissipation cavities are composed of heat dissipation grooves three on both sides of the inner wall of the upper outer mold and heat dissipation grooves four on both sides of the upper inner mold, arranged in an "S" shape. The upper inner mold also has multiple connecting cavities two that connect the two second heat dissipation cavities.

[0008] As a further embodiment of this utility model: the two second heat dissipation cavities are respectively connected to the two first heat dissipation cavities through two conductive heads installed at the ends.

[0009] As a further embodiment of this utility model: the lower mold further includes a one-way valve, which is fixedly installed in the end of the first heat dissipation cavity connected to the conductive head.

[0010] As a further aspect of this utility model: the one-way valve includes: The valve body has a sealing ring and a positioning ring installed at each end; A movable rod is movably installed in the valve body and passes through the sealing ring and the positioning ring. A sealing head is fixedly installed on the rod, and the sealing head is located between the sealing ring and the positioning ring. The spring is mounted on the movable rod, with its two ends making contact with the positioning ring and the sealing head, respectively.

[0011] As a further embodiment of this utility model: the guide head includes a connecting cylinder, in which a top pressure rod is fixedly installed by a fixing plate in the middle. The top pressure rod is coaxial with the movable rod, and its lower end is in contact with the upper end of the movable rod.

[0012] The beneficial effects of this utility model are as follows: This utility model provides a composite forging device for active bevel gears. Through the built-in "S"-shaped first heat dissipation cavity and gas circulation system, the lower die can be forcibly cooled during forging, effectively controlling the working temperature of the die and avoiding problems such as thermal fatigue and hardness reduction of the lower die caused by high-temperature forging blanks. This significantly reduces die wear and extends die service life. At the same time, it also effectively avoids problems such as unstable forging dimensions, surface defects or poor internal structure caused by excessively high or fluctuating die temperatures, which helps to produce bevel gear products with higher quality and consistent performance. Attached Figure Description

[0013] Figure 1 A three-dimensional structural diagram of a composite forging device for active bevel gears provided for an embodiment of this utility model; Figure 2 A partial structural cross-sectional schematic diagram of a composite forging device for active bevel gears provided in this embodiment of the present invention; Figure 3 A cross-sectional schematic diagram of the structure of the guide head of the active bevel gear composite forging device provided in this embodiment of the present invention; Figure 4for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a partial structural cross-sectional diagram of the lower inner mold and upper inner mold of an active bevel gear composite forging device provided in an embodiment of the present invention.

[0014] In the attached diagram: 1. Lower mold, 11. Lower outer mold, 12. Lower inner mold, 13. First heat dissipation cavity, 131. Heat dissipation groove one, 132. Heat dissipation groove two, 14. Connecting cavity one, 15. Connector, 16. One-way valve, 161. Valve body, 1611. Sealing ring, 1612. Positioning ring, 162. Movable rod, 1621. Sealing head, 163. Spring, 2. Upper mold, 21. Upper outer mold, 22. Upper inner mold, 23. Second heat dissipation cavity, 231. Heat dissipation groove three, 232. Heat dissipation groove four, 24. Connecting cavity two, 25. Conductor head, 251. Connecting cylinder, 252. Top pressure rod, 253. Fixing plate, 3. Forging billet. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0017] Please see Figures 1 to 5 This utility model embodiment provides a composite forging device for active bevel gears, used for composite forging processing of forging blank 3, including a lower die 1 and an upper die 2, wherein the lower die 1 and the upper die 2 are fixedly provided with cavities on adjacent surfaces corresponding to the size of forging blank 3; The lower mold 1 includes: Lower outer mold 11; The lower inner mold 12 is assembled inside the lower outer mold 11 by an interference fit; The two first heat dissipation cavities 13 are composed of heat dissipation grooves 131 on both sides of the inner wall of the lower outer mold 11 and heat dissipation grooves 132 on both sides of the lower inner mold 12, arranged in an "S" shape. The lower inner mold 12 also has a plurality of connecting cavities 14 that connect the two first heat dissipation cavities 13. Two connectors 15 are fixedly installed on the side of the lower outer mold 11, and are respectively connected to one end of the two first heat dissipation cavities 13 and connected to the external gas circulation system through pipes.

[0018] In practical application, the lower die 1 and the upper die 2 are preheated. After preheating, the lower die 1 and the upper die 2 are installed on the forging equipment. The forging billet is placed in the cavity opened on the lower die 1. The forging equipment is started to drive the upper die 2 to forge the forging billet. Together with the lower die 1, the forging process of the bevel gear is realized. At the same time, the external gas circulation system is connected through two connectors 15. The gas enters the first heat dissipation cavity 13 on one side through the connectors 15, exchanges heat with the lower die 1 through the connecting cavity 14, and then enters the first heat dissipation cavity 13 on the other side. It is then discharged into the gas circulation system through the connectors 15 to form a cooling cycle, thereby realizing synchronous cooling during the processing.

[0019] This embodiment utilizes a built-in "S"-shaped first heat dissipation cavity 13 in conjunction with a gas circulation system to forcibly cool the lower die 1 during forging, effectively controlling the working temperature of the die and preventing thermal fatigue and hardness reduction in the lower die 1 caused by the high-temperature forging blank 3. This significantly reduces die wear and extends die life. It also effectively avoids problems such as unstable forging dimensions, surface defects, or poor internal structure caused by excessively high or fluctuating die temperatures, which helps to produce bevel gear products with higher quality and consistent performance.

[0020] In one embodiment, the gas circulation system can be connected to a heat recovery device to recover and utilize the heat on the mold and forging, significantly reducing energy costs and improving energy efficiency.

[0021] Please see Figure 2 , Figure 3 and Figure 5 In a preferred embodiment of this utility model, the upper mold 2 includes: Upper outer mold 21; Upper inner mold 22 is assembled inside upper outer mold 21 by interference fit; The two second heat dissipation cavities 23 are composed of heat dissipation grooves 231 on both sides of the inner wall of the upper outer mold 21 and heat dissipation grooves 232 on both sides of the upper inner mold 22, arranged in an "S" shape. The upper inner mold 22 also has a plurality of connecting cavities 24 fixedly opened inside to connect the two second heat dissipation cavities 23.

[0022] Furthermore, the two second heat dissipation cavities 23 are connected to the two first heat dissipation cavities 13 respectively through two conductive heads 25 installed at the ends.

[0023] In practical application, this embodiment uses the second heat dissipation cavity 23 in conjunction with the first heat dissipation cavity 13. When the forging equipment presses down the upper die 2, the connecting head 25 connects the second heat dissipation cavity 23 and the first heat dissipation cavity 13, thereby connecting the two second heat dissipation cavities 23 and the connecting cavity 24 into the heat dissipation cycle, thereby achieving auxiliary heat dissipation for the upper die 2.

[0024] Please see Figure 3 and Figure 4 In another preferred embodiment of the present invention, the lower mold 1 further includes a one-way valve 16, which is fixedly installed in the end of the first heat dissipation cavity 13 connected to the conductive head 25.

[0025] Furthermore, the one-way valve 16 includes: The valve body 161 has a sealing ring 1611 and a positioning ring 1612 installed at its two ends respectively; The movable rod 162 is movably installed inside the valve body 161 and passes through the sealing ring 1611 and the positioning ring 1612. A sealing head 1621 is fixedly installed on it, and the sealing head 1621 is located between the sealing ring 1611 and the positioning ring 1612. Spring 163 is movably mounted on movable rod 162, with its two ends making contact with positioning ring 1612 and sealing head 1621 respectively.

[0026] Furthermore, the guide head 25 includes a connecting cylinder 251, in which a pressing rod 252 is fixedly installed by a fixing plate 253. The pressing rod 252 is coaxial with the movable rod 162, and its lower end is in contact with the upper end of the movable rod 162.

[0027] In practical application, this embodiment utilizes the one-way structure of the one-way valve 16. When the upper mold 2 is not pressed down, the two first heat dissipation chambers 13 and the connecting chamber 14 work together with the external gas circulation equipment to independently complete the heat dissipation cycle. When the upper mold 2 is pressed down, the top pressure rod 252 and the movable rod 162 are pressed into contact. As the upper mold 2 continues to be pressed down, the sealing head 1621 will separate from the sealing ring 1611, thereby realizing the connection between the first heat dissipation chamber 13 and the second heat dissipation chamber 23, and thus achieving the cooling and heat dissipation of the lower mold 1 and the upper mold 2.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite forging device for active bevel gears, used for composite forging of forging blanks (3), characterized in that: It includes a lower die (1) and an upper die (2), wherein the lower die (1) and the upper die (2) are provided with cavities on adjacent surfaces corresponding to the size of the forging blank (3); The lower mold (1) includes: Lower outer mold (11); The lower inner mold (12) is assembled inside the lower outer mold (11) by an interference fit; The two first heat dissipation cavities (13) are composed of heat dissipation groove one (131) opened on both sides of the inner wall of the lower outer mold (11) and heat dissipation groove two (132) opened on both sides of the lower inner mold (12), and are arranged in an "S" shape. The lower inner mold (12) is also fixedly provided with multiple connecting cavities one (14) connecting the two first heat dissipation cavities (13). Two connectors (15) are fixedly installed on the side of the lower outer mold (11), and are connected to one end of the two first heat dissipation chambers (13) respectively and connected to the external gas circulation system through pipes.

2. The composite forging device for active bevel gears according to claim 1, characterized in that: The upper mold (2) includes: Upper outer mold (21); The upper inner mold (22) is assembled inside the upper outer mold (21) by an interference fit; The two second heat dissipation cavities (23) are composed of heat dissipation grooves three (231) on both sides of the inner wall of the upper outer mold (21) and heat dissipation grooves four (232) on both sides of the upper inner mold (22), arranged in an "S" shape. The upper inner mold (22) also has multiple connecting cavities two (24) that connect the two second heat dissipation cavities (23).

3. The composite forging device for active bevel gears according to claim 2, characterized in that: The two second heat dissipation cavities (23) are connected to the two first heat dissipation cavities (13) respectively through two conductive heads (25) installed at the ends.

4. The composite forging device for active bevel gears according to claim 3, characterized in that: The lower mold (1) also includes a one-way valve (16), which is fixedly installed in the end of the first heat dissipation cavity (13) connected to the conductive head (25).

5. A composite forging device for active bevel gears according to claim 4, characterized in that: The one-way valve (16) includes: The valve body (161) has a sealing ring (1611) and a positioning ring (1612) installed at its two ends respectively. The movable rod (162) is movably installed inside the valve body (161) and passes through the sealing ring (1611) and the positioning ring (1612). A sealing head (1621) is fixedly installed on it, and the sealing head (1621) is located between the sealing ring (1611) and the positioning ring (1612). The spring (163) is mounted on the movable rod (162), and its two ends are pressed into contact with the positioning ring (1612) and the sealing head (1621) respectively.

6. The composite forging device for active bevel gears according to claim 5, characterized in that: The guide head (25) includes a connecting cylinder (251), in which a top pressure rod (252) is fixedly installed by a fixing plate (253). The top pressure rod (252) is coaxial with the movable rod (162), and its lower end is in contact with the upper end of the movable rod (162).

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