A dual-mode forging die and forging method

Abstract

This invention provides a dual-mode forging die and a forging method for forging forged parts. The dual-mode forging die includes a lower forging die and an upper forging die mounted on a forging press. When the upper forging die is used in conjunction with the lower forging die, a closed cavity and an open cavity are located in the same cavity between the lower and upper forging dies. The longitudinal extension direction of the closed cavity is connected to the open cavity, and both the open and closed cavities are provided with transverse flash grooves in their circumferential directions. As can be seen from the above description, by setting the closed and open cavities in the same cavity, the forging part with corners is fully filled, the transition is good, raw materials are saved, and machining allowance is reduced. In addition, this application also provides a forging method for forging forged parts, which simplifies the forging process, thereby achieving the purpose of reducing manufacturing costs and improving forging efficiency.

Description

Technical Field

[0001] This invention relates to the field of die forging design technology, and in particular to a dual-mode forging die and a forging method for forging forgings. Background Technology

[0002] There are two existing die forging designs: closed die forging and open die forging. Closed die forging involves metal deformation within a closed die cavity, forcing the metal to fill the cavity without producing transverse flash. A small amount of excess metal is discharged as longitudinal burrs or flash. Closed die forging is often used for products where filling is difficult and high raw material utilization is required. Compared to open die forging, it requires larger tonnage equipment and an ejector device. Open die forging, on the other hand, does not completely restrict the metal's deformation and flow within the die cavity. Instead, transverse flash grooves are created on the die, and excess metal flows out through these grooves, forming transverse flash. Open die forging effectively avoids forging defects caused by discrepancies between the billet and the cavity volume, and is therefore widely used. Closed die forging is characterized by longitudinal burrs or flash, while open die forging is characterized by transverse flash.

[0003] With the diversification of forgings, a single die forging method cannot be used to form the same forging, and it is necessary to match it with subsequent processing. For example Figure 1 As shown, forging 100 has two locations that require the design of sharp corners 110. The sharp corners 110 should preferably be formed in a closed die, but the structure of other parts of the forging limits the use of closed die forging. The conventional method is to use open die forging. The sharp corners 110 must either be pre-forged or the material must be increased or other measures must be taken to solve the problem, which will increase the forging cost and reduce the forging efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dual-mode forging die and forging method. By setting the closed cavity and the open cavity inside the same cavity, the forging with corners is fully filled, has good transition, saves raw materials, and reduces machining allowance, thereby reducing manufacturing costs and increasing forging efficiency.

[0005] This invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides a dual-mode forging die, comprising: a lower forging die, and an upper forging die mounted on a forging press; wherein,

[0007] When the upper forging die is used in conjunction with the lower forging die, the lower forging die and the upper forging die have a closed cavity and an open cavity located in the same cavity.

[0008] The longitudinal extension direction of the closed cavity is connected to the open cavity, and both the open cavity and the closed cavity are provided with transverse flash grooves in their circumferential directions.

[0009] Preferably, the upper forging die and the lower forging die are mutually fitted to form the closed cavity.

[0010] Preferably, when the closed cavity is provided with two corner-starting positioning cavities, the two corner-starting positioning cavities are an independent closed corner-starting cavity and a cooperating closed corner-starting cavity, respectively.

[0011] Preferably, a lower protrusion is provided on one side of the lower forging die, and the lower protrusion covers part of the cavity of the lower forging die to form the independent closed corner-starting cavity.

[0012] Preferably, a corner-raising groove is provided on the other side of the lower forging die, and an upper protrusion is provided on the upper forging die to cooperate with the corner-raising groove;

[0013] When the upper protrusion presses against and covers the corner groove, it forms the mating closed corner cavity.

[0014] Preferably, the corner groove is longitudinally connected to the open cavity.

[0015] Preferably, the overflow transverse flash of the open cavity is connected to the transverse flash groove.

[0016] Preferably, the longitudinal flash of the closed cavity and the open cavity intersect in a straight line; or;

[0017] The longitudinal flash of the closed cavity and the transverse flash of the open cavity intersect at an angle.

[0018] As can be seen from the above description, by setting the closed cavity and the open cavity inside the same cavity, the corner forging is fully filled, has good transition, saves raw materials, and reduces machining allowance.

[0019] Secondly, this application also provides a forging method for a forging, comprising the following steps:

[0020] Install the lower forging die on the forging equipment and the upper forging die on the forging press;

[0021] After the prepared billet is heated, it is placed into the cavity of the lower forging die. The forging press is started, and the upper forging die and the lower forging die gradually close together for forging.

[0022] The blank is simultaneously filled and formed in both a closed cavity and an open cavity;

[0023] After the forging is processed, the flash of the forging is removed.

[0024] By using the above methods, the forging process can be simplified, thereby reducing manufacturing costs and improving forging efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the forging provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the lower forging die provided in an embodiment of the present invention;

[0027] Figure 3 These are forming photographs of the forgings provided in the embodiments of the present invention;

[0028] Figure 4 This is a flowchart of the forging method provided in the embodiments of the present invention.

[0029] Icon labels:

[0030] Forging -100, sharp corner -110;

[0031] Lower forging die-10, closed cavity-11, open cavity-12, lower protrusion-13, corner groove-14, transverse flash groove-15. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 and not intended to limit the invention.

[0033] This invention provides a forging method for a dual-mode forging die and forging. First, the application scenarios of this method are explained. Currently, with the diversification of forgings, a single forging method cannot be used to form the same forging, requiring matching and subsequent processing. For example... Figure 1 As shown, forging 100 has two locations requiring sharp corners 110. These sharp corners 110 should ideally be formed using a closed die, but the structure of other parts of the forging limits its ability to be entirely formed using a closed die. The conventional method is to use fully open forging. The sharp corners 110 must either be pre-forged or require additional material or other measures, which increases forging costs and reduces forging efficiency. Therefore, this application provides a dual-mode forging die and forging method. By setting both closed and open cavities within the same cavity, the forging with sharp corners is fully filled, has good transition, saves raw materials, and reduces machining allowance, thereby reducing manufacturing costs and increasing forging efficiency.

[0034] See also Figure 1-2The dual-mode forging die includes a lower forging die 10 and an upper forging die mounted on a forging press. The lower forging die 10 is mounted on the forging equipment, and the forging press applies pressure to fill the closed cavity 11 and the open cavity 12 of the high-temperature billet inside the lower forging die 10.

[0035] against Figure 1 When forging forging parts, the conventional design approach is to use open die forging, using pre-forging to forge difficult-to-fill areas. However, adding a pre-forging cavity increases die costs, especially for some large forgings that are too large to be pre-forged in a single die, requiring a new die, which inevitably increases the number of forging passes, reduces forging efficiency, and increases the difficulty of trial production. To solve these problems, in this application, when the upper forging die is used in conjunction with the lower forging die 10, there are closed cavities 11 and open cavities 12 located in the same cavity between the lower forging die 10 and the upper forging die; by combining the closed cavities 11 and open cavities 12 into a single cavity, different structures can leverage their respective advantages.

[0036] The longitudinal extension direction of the closed cavity 11 is connected to the open cavity 12, and the open cavity 12 and the closed cavity 11 are provided with transverse flash grooves 15 in the circumferential direction.

[0037] Combination Figure 2 As shown, the upper forging die (not shown) and the lower forging die 10 fit together to form a closed cavity 11. The upper forging die and the lower forging die 10 are in a mutually fitting relationship, and a cavity is formed after the upper forging die and the lower forging die 10 fit together.

[0038] In a specific embodiment of this application, the forging 100 has two locations that require the design of sharp corners 110. The sharp corners 110 should preferably be formed in a closed die, but the structure of other parts of the forging limits the use of closed die forging. The conventional method is to use open die forging. The sharp corners 110 should either be pre-forged or the material should be increased or other measures should be taken to solve the problem. When forging the forging in a targeted manner, the closed cavity 11 is provided with two corner positioning cavities.

[0039] The two corner-raising positioning cavities are an independent closed corner-raising cavity and a mating closed corner-raising cavity, respectively. Specifically, a lower protrusion 13 is provided on one side of the lower forging die 10, which covers part of the cavity of the lower forging die 10 to form an independent closed corner-raising cavity. A corner-raising groove 14 is provided on the other side of the lower forging die 10, and an upper protrusion is provided on the upper forging die to mate with the corner-raising groove 14; when the upper protrusion covers the corner-raising groove 14, a mating closed corner-raising cavity is formed.

[0040] Furthermore, the corner groove 14 is longitudinally connected to the open cavity 12, so that after the blank fills the closed cavity 11, it fills the open cavity 12 through longitudinal flow. The overflow transverse flash of the open cavity 12 is connected to the transverse flash groove 15; the longitudinal flash of the closed cavity 11 and the open cavity 12 transition to a straight line or the longitudinal flash of the closed cavity 11 and the transverse flash of the open cavity 12 transition to an angle (e.g., Figure 3 (as shown in the image).

[0041] As can be seen from the above structure, the two difficult-to-fill sharp corners 110 are designed as closed forgings. One sharp corner is forged in a closed manner on the lower forging die, and the other sharp corner is forged in a closed manner on the upper forging die in conjunction with the lower forging die 10. The remaining positions of the cavity are designed as open forgings. Because the open cavity has transverse flash grooves, to ensure the continuity of the flash grooves, flash grooves are opened at all positions on the parting plane. During the forging process, the flash grooves at the closed cavity 11 positions are ineffective. Figure 3 As shown, the longitudinal flash formed by closed forging and the transverse flash formed by open forging converge into a straight line on the parting plane, resulting in continuous flash and good filling effect during forging. This technology is also applicable to products with local features suitable for open forging and local features suitable for closed forging. This technology can save raw materials and reduce machining allowances.

[0042] In this invention, by setting the closed cavity 11 and the open cavity 12 inside the same cavity, the corner forging is fully filled, has good transition, saves raw materials, and reduces machining allowance.

[0043] Secondly, this application also provides a forging method for a forging, comprising the following steps:

[0044] S1. Install the lower forging die on the forging equipment and the upper forging die on the forging press;

[0045] S2. After heating the prepared billet, place it into the cavity of the lower forging die, start the forging press, and gradually close the upper and lower forging dies for forging.

[0046] S3. The blank is filled and formed simultaneously in both closed and open cavities;

[0047] S4. After the forging is processed, the flash of the forging is eliminated.

[0048] By using the above methods, the forging process can be simplified, thereby reducing manufacturing costs and increasing forging efficiency.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-mode forging die, characterized in that, include: The lower forging die, and the upper forging die mounted on the forging press; among them, When the upper forging die is used in conjunction with the lower forging die, the lower forging die and the upper forging die have a closed cavity and an open cavity located in the same cavity. The closed cavity extends longitudinally and communicates with the open cavity. Both the open and closed cavities are provided with transverse flash grooves in their circumferential direction. The upper forging die and the lower forging die are mutually fitted to form the closed cavity. When the closed cavity is provided with two corner-starting positioning cavities, the two corner-starting positioning cavities are an independent closed corner-starting cavity and a mating closed corner-starting cavity, respectively. One side of the lower forging die is provided with a lower protrusion, which covers part of the cavity of the lower forging die to form the independent closed corner-starting cavity. The other side of the lower forging die is provided with a corner-starting groove. The upper forging die is provided with an upper protrusion that mates with the corner-starting groove. When the upper protrusion presses against and covers the corner-starting groove, it forms the mating closed corner-starting cavity. The corner-starting groove is longitudinally connected to the open cavity.

2. The dual-mode forging die according to claim 1, characterized in that, The overflow transverse flash of the open cavity is connected to the transverse flash groove; The longitudinal flash of the closed cavity is not connected to the transverse flash groove.

3. The dual-mode forging die according to claim 1, characterized in that, The longitudinal flash of the closed cavity and the open cavity intersect in a straight line; or; The longitudinal flash of the closed cavity and the transverse flash of the open cavity intersect at an angle.

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