External locking closed forging die

Abstract

The utility model provides an external locking closed type forging die which comprises an upper die part and a lower die part, the upper die part comprises an upper die, the lower die part comprises a lower die, a bearing plate, a plurality of locking force rods and a lower die base, the lower die is arranged on the top face of the bearing plate, a cavity used for material forming is formed between the upper die and the lower die, and the lower die base is located below the bearing plate. The upper ends of the locking force rods penetrate through the lower die base to abut against the bottom face of the bearing plate, the lower ends of the locking force rods are connected with fixing mechanisms providing upward hydraulic force for the locking force rods, the locking force rods can move up and down relative to the lower die base, and the multiple locking force rods are evenly distributed around the cavity. The locking force rod forms an outer locking force wall around the cavity by means of hydraulic force provided by the fixing mechanism, and the hydraulic force is larger than impact force generated when the die assembly distance is decreased and the transverse flowing force of the material is increased when the material is subjected to the material, so that the material is prevented from overflowing into a die parting surface. Hydraulic force of the fixing mechanism is applied to the locking force rod, too many receding holes do not need to be formed, and the strength of the lower die part is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of moulds, in particular to a closed forging mould with external locking. Background Art

[0002] In the existing moulds, multiple nitrogen springs need to be arranged in the limited space of the lower mould. When the upper mould presses down on the lower mould, the nitrogen springs apply force to the lower mould to make the lower mould push up against the upper mould. At this time, a locking closure is formed between the upper mould and the lower mould. However, during the forging and extrusion forming process, there is a situation where the locking force yield is insufficient, resulting in the material possibly overflowing from the middle of the parting surface between the upper and lower moulds, causing product defects and not meeting the design requirements. Moreover, when the locking force requirement is greater, the more nitrogen springs are needed. As the number of nitrogen springs increases, more clearance holes need to be set in the lower mould, affecting the strength of the lower mould. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a closed forging mould with external locking, which solves the problem of insufficient locking force yield between the upper and lower moulds, thereby avoiding the overflow of materials from the parting surface between the upper and lower moulds and ensuring the strength of the lower mould.

[0004] The technical solution of the utility model is realized as follows:

[0005] A closed forging mould with external locking includes an upper mould part and a lower mould part located below the upper mould part. The upper mould part includes an upper mould, and the lower mould part includes a lower mould, a bearing plate, multiple locking force rods and a lower mould base. The lower mould is arranged on the top surface of the bearing plate. A cavity for material forming is formed between the upper mould and the lower mould. The lower mould base is located below the bearing plate. The upper ends of the locking force rods pass through the lower mould base and abut against the bottom surface of the bearing plate. The lower ends of the locking force rods are connected with a fixing mechanism that provides an upward hydraulic pressure to the locking force rods. The locking force rods can move up and down relative to the lower mould base, and multiple locking force rods are evenly distributed around the cavity.

[0006] Preferably, the fixing mechanism and the locking force rods form a hydraulic rod. The fixing mechanism is the pressure cylinder of the hydraulic rod, and the locking force rods are the piston rods of the hydraulic rod.

[0007] Preferably, the lower mould base includes a lower connecting plate, a lower backing plate and a lower seat plate arranged in sequence from top to bottom. The top surface of the lower backing plate abuts against the bottom surface of the lower connecting plate, and the bottom surface of the lower backing plate abuts against the top surface of the lower seat plate.

[0008] Preferably, a lower insert is arranged in the lower mould, and a die core is arranged in the upper mould.

[0009] Preferably, the lower mould part further includes a ejector rod that can move up and down relative to the lower mould base. The lower insert penetrates through the bearing plate, and the ejector rod passes through the lower mould base and abuts against the bottom surface of the lower insert.

[0010] Preferably, the upper die part further includes an upper die base, and the upper die is disposed on the bottom surface of the upper die base.

[0011] Preferably, the upper die base includes an upper bottom plate and an upper connecting plate. The top surface of the upper connecting plate abuts against the bottom surface of the upper bottom plate, and the top surface of the upper die abuts against the bottom surface of the upper connecting plate.

[0012] Preferably, an upper backing plate is provided between the upper die and the upper connecting plate.

[0013] Preferably, the number of the locking force rods is 4 to 12.

[0014] Preferably, multiple locking force rods are evenly distributed on the same virtual circle.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] (1) The closed forging die with external locking includes locking force rods. The upper ends of the locking force rods pass through the lower die base and abut against the bottom surface of the bearing plate. The locking force rods form an external locking force wall around the cavity by means of the hydraulic pressure provided by the fixing mechanism. This hydraulic pressure is greater than the impact force of the material when the closing distance decreases and the lateral flow force of the material increases, so as to avoid the material from overflowing into the parting surface and solve the problem of insufficient yield of the locking force between the upper and lower dies;

[0017] (2) By applying the hydraulic pressure of the fixing mechanism to the locking force rods, the force of the locking force rods is applied to the bearing plate, and the force of the bearing plate is applied to the lower die, which can provide a force of hundreds of tons or more, and there is no need to set too many relief holes, which can ensure the strength of the lower die part. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the lower die part of the prior art;

[0019] Figure 2 is a schematic diagram of the distribution of nitrogen springs in the prior art;

[0020] Figure 3 is a schematic diagram of the flow of the material in the cavity in the prior art;

[0021] Figure 4 is a schematic structural diagram of the present utility model during die splitting;

[0022] Figure 5 is a schematic structural diagram of the present utility model during die closing;

[0023] Figure 6 is a schematic diagram of the distribution of the locking force rods in the present utility model;

[0024] Figure 7 is a schematic diagram of the flow of the material in the cavity in the present utility model.

[0025] Reference Signs:

[0026] 1 - Upper die part; 11 - Upper die; 12 - Die core; 13 - Upper die base; 131 - Upper bottom plate; 132 - Upper connecting plate; 133 - Upper backing plate; 2 - Lower die part; 21 - Lower die; 22 - Carrier plate; 23 - Locking force rod; 24 - Lower die base; 241 - Lower connecting plate; 242 - Lower backing plate; 243 - Lower seat plate; 25 - Fixing mechanism; 26 - Lower insert; 27 - Ejector rod; 28 - Nitrogen spring; 3 - Cavity. Specific embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] In the existing mold, multiple nitrogen springs 28 need to be arranged in the restricted space of the lower die so that when the upper die presses down on the lower die, the nitrogen springs 28 exert force on the lower die to make the lower die push up against the upper die. At this time, a locking closure is formed between the upper die and the lower die. However, during the forging and extrusion forming process, there is a situation where the locking force yield is insufficient, resulting in the material possibly overflowing from the middle of the parting surface between the upper and lower dies, causing product defects and not meeting the design requirements. Moreover, when the locking force requirement is greater, the number of nitrogen springs 28 required is more. As the number of nitrogen springs 28 increases, more clearance holes need to be set in the lower die part 2, affecting the strength of the lower die part 2. See Figures 1 to 3 .

[0030] See Figures 4 to 6, the utility model provides a closed forging die with external locking, which includes an upper die part 1 and a lower die part 2 located below the upper die part 1. The upper die part 1 includes an upper die 11, and the lower die part 2 includes a lower die 21, a bearing plate 22, multiple locking force rods 23 and a lower die base 24. The lower die 21 is arranged on the top surface of the bearing plate 22. A cavity 3 for material forming is formed between the upper die 11 and the lower die 21. The lower die base 24 is located below the bearing plate 22. The upper end of the locking force rod 23 passes through the lower die base 24 and abuts against the bottom surface of the bearing plate 22. A fixing mechanism 25 for providing an upward hydraulic pressure to the locking force rod 23 is connected to the lower end of the locking force rod 23. The locking force rod 23 can move up and down relative to the lower die base 24, and multiple locking force rods 23 are evenly distributed around the cavity 3.

[0031] When the machine (not shown in the figure) applies force to drive the upper die 11 to press downward until the upper die 11 contacts the lower die 21, the locking force rods 23 form an external locking force wall around the cavity 3 by relying on the hydraulic pressure provided by the fixing mechanism 25. The lower die 21 is simultaneously subjected to the downward pressure of the upper die 11 and the upward pressure of the locking force rods 23. Subsequently, the upper die 11 continues to apply force downward. When the force applied by the upper die 11 is greater than the hydraulic pressure provided by the fixing mechanism 25 to the locking force rods 23 (that is, the downward pressure of the upper die 11 is greater than the upward pressure of the locking force rods 23), the upper die 11 drives the lower die 21, the bearing plate 22 and the locking force rods 23 to move downward together, making the distance between the bearing plate 22 and the lower die base 24 smaller and smaller. After the bearing plate 22 abuts against the lower die base 24, the upper die 11 and the lower die 21 are completely closed, and the product is formed in the cavity 3.

[0032] After the upper die 11 and the lower die 21 are completely fitted, when the upper die 11 continues to apply force downward, the upward pressure on the lower die 21 by the locking force rods 23 is the hydraulic pressure of the fixing mechanism 25 transmitted to the locking force rods 23. This hydraulic pressure is greater than the impact force of the material when the material lateral flow force increases due to the decrease of the mold closing distance, so as to avoid the material overflowing into the parting surface and solve the problem of insufficient yield of the locking force between the upper and lower dies. Specifically, when the upper die 11 contacts the lower die 21, the hydraulic pressure of the fixing mechanism 25 is applied to the locking force rods 23, the force of the locking force rods 23 is applied to the bearing plate 22, and the force of the bearing plate 22 is applied to the lower die 21. The upper die 11 continues to apply force downward to drive the lower die 21, the bearing plate 22 and the locking force rods 23 to move downward together. When the upper die 11 and the lower die 21 change from the initial contact to slowly closing completely to form a closed space, when the material in the cavity 3 flows outward and touches the external locking force wall, it is blocked from flowing and changes direction (see Figure 7 ), and flows to the position with gaps in the cavity 3 for filling, and finally a complete product is formed.

[0033] In the prior art, the elastic force of a nitrogen spring is limited. A conventional nitrogen spring can provide a force of several hundred kilograms to several tons. When casting large products that require a force of hundreds of tons or more, the number of nitrogen springs needed will increase. As the number of nitrogen springs increases, more avoidance holes need to be provided in the lower die base 24, which affects the strength of the lower die part 2. In this application, the hydraulic pressure of the fixing mechanism 25 is applied to the locking force rod 23, the force of the locking force rod 23 is applied to the bearing plate 22, and the force of the bearing plate 22 is applied to the lower die 21, which can provide a force of hundreds of tons or more, and there is no need to set too many avoidance holes, which can ensure the strength of the lower die part 2.

[0034] Specifically, the number of locking force rods 23 can be arranged in 4 to 12. In this embodiment, referring to Figure 6 , 6 locking force rods 23 are arranged. The number of locking force rods 23 can be appropriately adjusted, but the number cannot be too large. Too large a number will cause the strength of the lower die part 2 to become weak, shortening the service life of the lower die part 2.

[0035] Preferably, referring to Figure 6 , multiple locking force rods 23 are evenly distributed on the same virtual circle to form a cylindrical outer locking force wall, so that when the upper die 11 and the lower die 21 are closed, a more uniform locking force can be received.

[0036] Specifically, the fixing mechanism 25 and the locking force rod 23 form a hydraulic rod. The fixing mechanism 25 is the pressure cylinder of the hydraulic rod, and the locking force rod 23 is the piston rod of the hydraulic rod. The hydraulic rod provides hydraulic pressure for the piston rod, and the piston rod is pressed upward by the hydraulic pressure against the bearing plate 22, so that the lower die 21 is forced to lean against the upper die 11.

[0037] Specifically, the lower die base 24 includes a lower connecting plate 241, a lower backing plate 242, and a lower seat plate 243 arranged in sequence from top to bottom. The top surface of the lower backing plate 242 abuts against the bottom surface of the lower connecting plate 241, and the bottom surface of the lower backing plate 242 abuts against the top surface of the lower seat plate 243. The lower connecting plate 241 is used to limit the downward movement distance of the lower die 21, the bearing plate 22, and the locking force rod 23. The lower seat plate 243 is used to support the lower connecting plate 241 and the lower backing plate 242. The lower backing plate 242 is mainly used for support and buffering to prevent the lower seat plate 243 from being damaged or deformed abnormally.

[0038] Preferably, a lower insert 26 is provided in the lower die 21, and a die core 12 is provided in the upper die 11. The lower insert 26, as an insert or insert block, can improve the wear resistance, heat resistance, or forming of a specific shape of the mold. The die core 12 is used to form the inner shape and holes of the product.

[0039] Preferably, the lower die part 2 further includes a ejector rod 27 that can move up and down relative to the lower die base 24. The lower insert 26 penetrates through the bearing plate 22, and the ejector rod 27 passes through the lower die base 24 and abuts against the bottom surface of the lower insert 26. The ejector rod 27 restricts the height position of the initial contact between the upper die 11 and the lower die 21.

[0040] In this embodiment, the upper die part 1 further includes an upper die base 13, and the upper die 11 is disposed on the bottom surface of the upper die base 13. Specifically, the upper die base 13 includes an upper bottom plate 131 and an upper connecting plate 132. The top surface of the upper connecting plate 132 abuts against the bottom surface of the upper bottom plate 131, and the top surface of the upper die 11 abuts against the bottom surface of the upper connecting plate 132. The upper bottom plate 131 is used to carry the upper connecting plate 132, and the upper connecting plate 132 is used to connect the upper bottom plate 131 and the upper die 11.

[0041] Preferably, an upper cushion plate 133 is provided between the upper die 11 and the upper connecting plate 132. The upper cushion plate 133 is mainly used for support and buffering to prevent the upper die 11 from being damaged or deformed abnormally.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An externally locked closed forging die, characterized in that: The invention comprises an upper mold part (1) and a lower mold part (2) located below the upper mold part (1), wherein the upper mold part (1) comprises an upper mold (11), and the lower mold part (2) comprises a lower mold (21), a support plate (22), a plurality of locking force rods (23) and a lower mold seat (24), wherein the lower mold (21) is arranged on the top surface of the support plate (22), and a cavity (3) for molding a material is formed between the upper mold (11) and the lower mold (21), and the lower mold The seat (24) is located below the support plate (22); the upper end of the locking force rod (23) passes through the lower die seat (24) and abuts against the bottom surface of the support plate (22); the lower end of the locking force rod (23) is connected to a fixing mechanism (25) for providing an upward hydraulic force to the locking force rod (23); the locking force rod (23) can move up and down relative to the lower die seat (24); and a plurality of the locking force rods (23) are evenly distributed around the cavity (3).

2. The externally locked closed forging die according to claim 1, characterized in that: The fixing mechanism (25) and the locking force rod (23) form a hydraulic rod, the fixing mechanism (25) is a pressure cylinder of the hydraulic rod, and the locking force rod (23) is a piston rod of the hydraulic rod.

3. The externally locked closed forging die according to claim 1, characterized in that: The lower mold base (24) comprises a lower connecting plate (241), a lower pad (242) and a lower seat plate (243) which are arranged in sequence from top to bottom, the top surface of the lower pad (242) abuts against the bottom surface of the lower connecting plate (241), and the bottom surface of the lower pad (242) abuts against the top surface of the lower seat plate (243).

4. The externally locked closed forging die according to claim 3, characterized in that: A lower insert (26) is provided in the lower mold (21), and a mold core (12) is provided in the upper mold (11).

5. The externally locked closed forging die according to claim 4, characterized in that: The lower mold part (2) also includes a push rod (27) that can move up and down relative to the lower mold base (24); the lower insert (26) passes through the support plate (22); and the push rod (27) passes through the lower mold base (24) and abuts against the bottom surface of the lower insert (26).

6. The externally locked closed forging die according to claim 1, characterized in that: The upper mold part (1) also includes an upper mold base (13), and the upper mold (11) is arranged on the bottom surface of the upper mold base (13).

7. The externally locked closed forging die according to claim 6, characterized in that: The upper mold base (13) comprises an upper base plate (131) and an upper connecting plate (132), the top surface of the upper connecting plate (132) abuts against the bottom surface of the upper base plate (131), and the top surface of the upper mold (11) abuts against the bottom surface of the upper connecting plate (132).

8. The externally locked closed forging die according to claim 7, characterized in that: An upper pad (133) is provided between the upper mold (11) and the upper connecting plate (132).

9. The externally locked closed forging die according to any one of claims 1 to 8, characterized in that: The number of the locking force rods (23) is 4 to 12.

10. The externally locked closed forging die according to any one of claims 1 to 8, characterized in that: The plurality of locking force rods (23) are evenly distributed on the same virtual circle.

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