Forging forming die for flange shaft forge piece for ship

Abstract

The utility model belongs to the technical field of forging dies, and provides a marine flanged shaft forge piece forging forming die, which comprises an upper die, a lower die, a lower die, an upper die, a lower die, a lower die, an upper die and a lower die, the upper die is provided with a cavity hole with a step-shaped longitudinal section, and the lower end face of the upper die is provided with an annular clamping groove; the lower die is provided with a shaft hole matched with the flange shaft forge piece, and an annular boss matched with the clamping groove is arranged on the upper end face of the lower die. According to the marine flanged shaft forge piece forging forming die, split type structural design is adopted, die manufacturing difficulty and production cost are reduced, compared with an existing die of an integrated structure, using is flexible, operation is convenient and fast, demolding after forging is completed is convenient, and production efficiency is improved. And tight clamping of the upper die and the lower die is effectively guaranteed through cooperation of the clamping groove and the boss, and assembling and separating are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of forging dies, and particularly relates to a forging die for forging a marine flange shaft forging. Background Technique

[0002] At present, the forging dies for large marine flange shaft forgings generally adopt an integral structure design, that is, the forging die is a whole structure design. For example, CN 203817265 U provides a forging flange die, including a die body. A cavity is formed in the die body in a hollowed-out manner. The cavity includes a large-diameter inner cavity and a small-diameter inner cavity that are vertically and communicatively arranged. The large-diameter inner cavity and the small-diameter inner cavity are coaxially arranged. An annular forging surface is formed between the large-diameter inner cavity and the small-diameter inner cavity. The forging surface includes an inner ring located on the outer circumference of the small-diameter inner cavity and an outer ring located on the outer circumference of the large-diameter inner cavity. A corner is recessed in the die body corresponding to the outer ring of the large-diameter inner cavity.

[0003] However, due to the integral structure design of the forging die provided by the above solution, on the one hand, the production and manufacturing difficulty of the die is large. The overall die blanking is heavy during the production process, and the processing technology requirements are high, resulting in an increase in the production and manufacturing cost of the die. On the other hand, it is not convenient to demold after forging. Since the forging needs to be completely lifted off the die, the demolding process is difficult and consumes a lot of resources, resulting in an increase in production costs. In addition, although some existing flange shaft forging dies adopt a combined structure design, most of them use bolt structures to achieve positioning and combination. The combination and disassembly separation processes are complicated, time-consuming and laborious, and it is difficult to ensure the fitting accuracy, resulting in uneven forging quality of the forgings.

[0004] Therefore, it is necessary to design a forging die for marine flange shaft forgings that can effectively solve the above problems. Summary of the Invention

[0005] In order to solve the above technical problems, the utility model provides a forging die for marine flange shaft forgings, which adopts a split structure design, reduces the die manufacturing difficulty and production cost, and is more flexible and convenient to operate compared with the existing integral structure die. It is convenient to demold after forging. The tight clamping of the upper die and the lower die is effectively ensured through the cooperation of the clamping groove and the convex platform, which is convenient for assembly and separation.

[0006] The technical solution of the utility model is as follows:

[0007] The utility model provides a forging die for marine flange shaft forgings, including:

[0008] An upper die, the upper die is provided with a cavity hole with a stepped longitudinal section, and an annular clamping groove is arranged on the lower end surface of the upper die;

[0009] Lower die, the lower die is provided with a shaft hole adapted to the flange shaft forging, and the upper end surface of the lower die is provided with an annular boss adapted to the clamping groove.

[0010] Preferably, the cavity hole includes a disk table part, a connecting part, and a frustum part connected in sequence from top to bottom;

[0011] The disk table part is arranged close to the upper end surface of the upper die, and the frustum part is arranged close to the lower end surface of the upper die.

[0012] Preferably, one side of the cross-section of the clamping groove close to the frustum part is inclined, and the inclination angle is the same as that of the frustum part;

[0013] One side of the cross-section of the boss close to the shaft hole is also inclined, and the inclination angle is the same as that of the frustum part.

[0014] Preferably, one side of the cross-section of the clamping groove away from the frustum part is inclined, and it is symmetrically arranged with the inclined side close to the frustum part;

[0015] One side of the cross-section of the boss away from the shaft hole is inclined, and it is symmetrically arranged with the inclined side close to the shaft hole.

[0016] Preferably, an annular limiting strip is arranged on the bottom wall of the clamping groove, and an annular limiting groove adapted to the limiting strip is arranged on the top of the boss.

[0017] Preferably, the clamping groove is arranged opposite to the frustum part.

[0018] Preferably, the ratio of the height of the shaft hole to the diameter of the shaft hole is less than 3:1.

[0019] The utility model has the following advantages and effects compared with the prior art:

[0020] By using an upper die provided with a clamping groove and a lower die provided with a boss, the clamping combination of the upper die and the lower die is completed through the cooperation of the annular clamping groove and the annular boss, which is convenient and fast to use, reduces the blanking weight in the mold production and manufacturing process, thereby reducing the manufacturing difficulty and production cost of the mold, and is also convenient for demoulding after forging;

[0021] By using a clamping groove with one side inclined close to the frustum part, and the inclined side of the clamping groove is parallel to the frustum part, the distance thickness between the frustum part and the clamping groove is increased, ensuring the toughness and strength of the frustum part at the clamping groove position, improving the stability and reliability of the upper die. At the same time, by using an inclined structure parallel to the frustum part, the stress area at the clamping groove is increased, thereby reducing the pressure at the position where the frustum part is close to the clamping groove and effectively improving the stability. Brief Description of the Drawings

[0022] Figure 1 This is a schematic structural diagram of the forging die for a marine flange shaft forging in Embodiment 1 of the present utility model;

[0023] Figure 2 This is a schematic internal structure diagram of the forging die for a marine flange shaft forging in Embodiment 1 of the present utility model;

[0024] Figure 3 This is a schematic internal structure diagram of the forging die for a marine flange shaft forging in Embodiment 2 of the present utility model;

[0025] Figure 4 This is a schematic internal structure diagram of the forging die for a marine flange shaft forging in Embodiment 3 of the present utility model;

[0026] Figure 5 This is a schematic internal structure diagram of the forging die for a marine flange shaft forging in Embodiment 4 of the present utility model.

[0027] Reference signs: 1. Upper die; 11. Cavity hole; 111. Disc table part; 112. Connection part; 113. Frustum part; 12. Clamping groove; 121. Limit strip; 2. Lower die; 21. Shaft hole; 22. Boss; 221. Limit groove. Detailed Description of the Embodiments

[0028] In order to enable those skilled in the art to better understand the present utility model, the present utility model will be further described below in conjunction with the specific embodiments.

[0029] Embodiment 1:

[0030] As Figures 1 to 2 shown, the present utility model provides a forging die for a marine flange shaft forging, which includes an upper die 1 and a lower die 2 with a split structure design. The specific dimensions of the upper die 1 and the lower die 2 need to be set according to the finished product dimensions of the marine flange shaft to be forged.

[0031] The upper die 1 is provided with a cavity hole 11 with a stepped longitudinal section to forge the upper disc surface of the flange shaft forging. Referring to Figure 2 shown, the cavity hole 11 includes a disc table part 111, a connection part 112, and a frustum part 113 that are connected in sequence from top to bottom. The disc table part 111 is arranged close to the upper end surface of the upper die 1, the frustum part 113 is arranged close to the lower end surface of the upper die 1, and the connection part 112 is connected to the disc table part 111 and the frustum part 113 at both ends respectively. The stepped cavity hole 11 can promote the fluidity of the metal, ensure better forming of the forging blank during the forging process, and avoid defects such as folding of the blank caused by die problems.

[0032] The lower end face of the upper die 1 is provided with an annular clamping groove 12, and the clamping groove 12 is arranged opposite to the frustum part 113, that is, the clamping groove 12 is located directly below the frustum part 113 of the cavity hole 11, so as to ensure that the frustum part 113 of the cavity hole 11 and the shaft hole 21 are closely matched during the cooperation of the upper die 1 and the lower die 2, and avoid defects such as folding of the flange shaft forging due to offset and clearance phenomena.

[0033] The lower die 2 is provided with a shaft hole 21 adapted to the marine flange shaft forging to forge the lower bottom shaft of the flange shaft forging. Further, the ratio of the height of the shaft hole 21 to the diameter of the shaft hole 21 is less than 3:1, so as to achieve better material distribution, improve the utilization rate of the blank, and ensure the forging quality of the forging.

[0034] The upper end face of the lower die 2 is provided with an annular boss 22 adapted to the clamping groove 12. The upper die 1 and the lower die 2 are positioned and clamped by embedding the annular boss 22 into the annular clamping groove 12. It is convenient and fast to use, and is convenient for demoulding after forging.

[0035] Optionally, in some embodiments, the edges of the groove wall of the clamping groove 12 and the edges of the boss 22 are chamfered, so that the boss 22 can be better clamped and embedded into the clamping groove 12.

[0036] In the specific use process, first preheat the upper die 1 and the lower die 2 respectively. After the heating is completed, thermally assemble the upper die 1 and the lower die 2; then upset the heated blank to make the diameter of the upset and rounded blank smaller than the inner hole size of the shaft hole 21, so that the upset blank can be easily placed into the die; finally, place the upset and rounded blank into the die, upset it, and after the upper die surface is flattened, demould to complete the forging of the flange shaft forging.

[0037] Embodiment 2:

[0038] For Embodiment 2 of the present invention, use Figure 3 to illustrate. In addition, parts that are not different from Embodiment 1 are omitted from the description and given the same reference numerals.

[0039] As Figure 3 shown, the marine flange shaft forging forming die involved in the present invention, wherein one side of the cross-section of the clamping groove 12 close to the frustum part 113 is arranged obliquely, and the inclination angle thereof is the same as that of the frustum part 113, that is, the inner groove wall of the clamping groove 12 is arranged parallel to the frustum part 113.

[0040] Combined with Figure 2 、 Figure 3 content, through the design of the inclined structure, the minimum distance (thickness) between the frustum part 113 and the clamping groove 12 is increased, and at the same time, the stress area at the inner groove wall of the clamping groove 12 is increased (from Figure 2The point contact in Figure 3 is changed to line contact), thereby improving the strength and toughness of the frustum portion 113 of the upper die 1, and further improving the stability and reliability of the upper die 1.

[0041] One side of the cross-section of the boss 22 close to the shaft hole 21 is also arranged obliquely, and it has the same inclination angle as the frustum portion 113, so as to complete the positioning and clamping of the upper die 1 and the lower die 2 through the cooperation of the boss 22 and the clamping groove 12.

[0042] Embodiment 3:

[0043] For Embodiment 3 of the present utility model, Figure 4 is described. In addition, parts that are not different from Embodiment 2 are omitted from the description and given the same reference numerals.

[0044] As Figure 4 shown, the forging and forming die for a marine flange shaft forging involved in the present utility model, wherein one side of the cross-section of the clamping groove 12 away from the frustum portion 113 is arranged obliquely, and it is symmetrically arranged with the inclined side on the side close to the frustum portion 113, that is, the cross-section of the clamping groove 12 is an isosceles trapezoid; one side of the cross-section of the boss 22 away from the shaft hole 21 is arranged obliquely, and it is symmetrically arranged with the inclined side on the side close to the shaft hole 21, that is, the cross-section of the boss 22 is an isosceles trapezoid.

[0045] During the process of clamping and combining the upper die 1 and the lower die 2, since the cooperation of the clamping groove 12 and the boss 22 is required to complete positioning and clamping, this process requires the complete and precise docking of the clamping groove 12 and the boss 22. Referring to Figure 2 the content shown, the cooperation of the clamping groove 12 and the boss 22 needs to be precisely docked from the moment of initial contact, which increases the difficulty of clamping the upper die 1 and the lower die 2, and it is time-consuming and laborious to continuously adjust the position. However, referring to Figure 4 the structure of this embodiment in

[0046] Embodiment 4:

[0047] For Embodiment 4 of the present utility model, Figure 5 is described. In addition, parts that are not different from Embodiment 3 are omitted from the description and given the same reference numerals.

[0048] As Figure 5As shown in the figure, the forging die for a marine flange shaft forging according to the present utility model, wherein, an annular limiting strip 121 is provided on the bottom wall of the clamping groove 12, and an annular limiting groove 221 adapted to the limiting strip 121 is provided on the top of the boss 22 to limit the upper die 1 and the lower die 2 in clamping, so as to avoid the radial offset of the upper die 1 and the lower die 2 after being subjected to a large radial force, and ensure the forging quality of the flange shaft forging.

[0049] In summary, the forging die for a marine flange shaft forging provided by the present utility model adopts a split structure design, reduces the die manufacturing difficulty and production cost, and is more flexible and convenient to operate than the existing integral structure die, facilitating demoulding after forging. The effective clamping of the upper die and the lower die is ensured through the cooperation of the clamping groove and the boss, which is convenient for assembly and separation.

[0050] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent changes and modifications made according to the scope of the present utility model should still fall within the scope covered by the present utility model.

Claims

1. A forging die for a marine flange shaft forging, characterized in that: include: An upper mold (1), the upper mold (1) being provided with a cavity (11) having a stepped longitudinal cross section, and a lower end surface of the upper mold (1) being provided with an annular clamping groove (12); A lower die (2), the lower die (2) being provided with an axial hole (21) adapted to the flange shaft forging, and an upper end surface of the lower die (2) being provided with an annular boss (22) adapted to the clamping groove (12).

2. The forging die for marine flange shaft forging according to claim 1, characterized in that: The cavity (11) comprises a disk portion (111), a connecting portion (112), and a frustum portion (113) which are sequentially connected from top to bottom; The disc portion (111) is arranged close to the upper end surface of the upper mold (1), and the frustum portion (113) is arranged close to the lower end surface of the upper mold (1).

3. The forging die for marine flange shaft forging according to claim 2, characterized in that: The side of the cross section of the clamping groove (12) close to the frustum portion (113) is arranged in an inclined manner, and has the same inclination angle as the frustum portion (113); The side of the cross section of the boss (22) close to the shaft hole (21) is also arranged in an inclined manner, and has the same inclination angle as the frustum portion (113).

4. The forging die for marine flange shaft forging according to claim 3 is characterized in that: The side of the cross section of the clamping groove (12) away from the frustum portion (113) is arranged obliquely, and is arranged symmetrically with the inclined side on the side close to the frustum portion (113); The side of the cross section of the boss (22) away from the shaft hole (21) is arranged in an inclined manner, and is arranged symmetrically with the inclined side of the side close to the shaft hole (21).

5. The forging die for marine flange shaft forging according to claim 4, characterized in that: The bottom wall of the clamping groove (12) is provided with an annular limiting strip (121), and the top of the boss (22) is provided with an annular limiting groove (221) matched with the limiting strip (121).

6. The forging die for marine flange shaft forging according to claim 2, characterized in that: The clamping groove (12) and the frustum portion (113) are arranged opposite to each other.

7. The forging die for marine flange shaft forging according to claim 1, characterized in that: The ratio of the height of the shaft hole (21) to the diameter of the shaft hole (21) is less than 3:1.

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