Integrated forging die for specially-shaped forged piece

Abstract

An integrated forging die for a specially-shaped forged piece, the integrated forging die comprising an upper anvil die and a lower forming die, wherein the upper anvil die comprises an upper die body and a mounting portion; the lower forming die comprises a lower die body and a forming cavity; the forming cavity consists of a rectangular groove and a disk area, wherein the disk area is located at one end of an upper surface of the forming cavity, and a longitudinal height of the disk area is smaller than a longitudinal height of the rectangular groove; and an included angle between two sides of the mounting portion and an upper surface of the upper die body is less than 90 degrees. Compared with a free forging method, a method of using the die to machine the specially-shaped forged piece having a disk has the advantages that the size after a heat treatment is closer to the size of a finished product, internal and external metal structures have a smaller difference, the production cycle is significantly shortened, the raw material consumption is lower, and the product material input costs are substantially reduced. Moreover, a continuous metal streamline is formed in a connection area between a rectangle and a disk, and the stepped rectangle and the disk are integrally formed, such that the product safety is higher.

Description

An integrated forging die for special-shaped forgings Technical Field

[0001] The utility model relates to the technical field of forging and forming, in particular to an integrated forging die for special-shaped forgings. Background Art

[0002] Nuclear reactor control rods are made of a material that strongly absorbs neutrons but does not undergo fission. As the control rods move within the reactor, the number of neutrons absorbed varies, altering the reactor's reactivity. As a critical component, the control rod deflector housing forgings bear enormous loads. These components, designated as Level 1 nuclear safety and quality assurance equipment, require complex manufacturing processes and rigorous quality and process controls. To a certain extent, they represent the highest level of control rod housing manufacturing capabilities.

[0003] The reactor control rod steering housing forging is a combination of a stepped rectangular forging and a disc forging. Currently, the manufacturing process for this special-shaped forging, both domestically and internationally, generally uses open die forging to create a forging that wraps the rectangular and disc parts together. The combined length of the rectangle and disc is used as the basic length of the forging, the diameter of the disc is used as the basic width, and the combined height of the rectangle and disc is used as the basic height. Products forged using this method consume nearly five times the weight of the finished forging. The large forging allowance leads to uneven internal microstructure during the heat treatment phase. After heat treatment, the finer surface microstructure is removed by machining chips, leaving the uneven internal microstructure on the finished product surface, potentially adversely affecting subsequent product use. Furthermore, the large machining allowance for forgings produced using this method is a waste of resources for manufacturers. This large machining allowance consumes more manpower and material resources, generates significant production waste, and prolongs production cycles. Furthermore, the disc is formed by a cutting process, which prevents the formation of continuous metal flow lines. This can lead to significant quality issues at the joints, resulting in highly inconsistent quality. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the current forging process for reactor control rod steering member housings, the utility model provides an integrated forging die for special-shaped forgings, which can reduce raw material consumption, improve product quality, and shorten production cycles.

[0005] In order to achieve the above-mentioned purpose, the embodiments of the present invention adopt the following technical solutions:

[0006] An integrated forging die for special-shaped forgings comprises an upper anvil die and a lower forming die, wherein the upper anvil die comprises an upper die body and a mounting portion; the lower forming die comprises a lower die body and a forming cavity; the forming cavity is composed of a rectangular groove and a disc area; the disc area is located at one end of the upper surface; the longitudinal height of the disc area is less than the longitudinal height of the rectangular groove; and the angle between the two sides of the mounting portion and the upper surface of the upper die body is less than ninety degrees.

[0007] According to one aspect of the present invention, a circular chamfer is provided at the opening of the molding cavity.

[0008] According to one aspect of the present invention, the longitudinal cross-section of the rectangular groove gradually narrows from top to bottom.

[0009] According to one aspect of the present invention, a side of the rectangular groove away from the disc area is a buffer extension area.

[0010] According to one aspect of the present invention, positioning screw holes are provided on the side surface of the upper mold body; and the number of the positioning screw holes is at least two.

[0011] According to one aspect of the present invention, rounded recesses are provided between the two sides of the mounting portion and the upper mold body.

[0012] According to one aspect of the present invention, a positioning groove is provided on the mounting portion.

[0013] Advantages of the implementation of this utility model:

[0014] By using the mold of this application, the product shape can be formed in one piece, which greatly shortens the processing cycle. At the same time, compared with the traditional free forging process, when forging special-shaped forgings, the heat treatment size is closer to the finished product size, and the difference between the internal and external metal structures is smaller, which greatly improves production efficiency; at the same time, it can save more raw materials and greatly reduce the raw material input cost of the product. In addition, the connection area between the rectangle and the disc forms a continuous metal streamline, and the stepped rectangle and the disc are integrated into one, which makes the product safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] FIG1 is a schematic structural diagram of an integrated forging die for special-shaped forgings according to the present invention;

[0017] FIG2 is a plan view of the front and back of the lower forming die according to an embodiment of the present invention;

[0018] FIG3 is a cross-sectional view taken along lines AA and BB in FIG2 ;

[0019] FIG4 is a side view of the upper anvil mold according to an embodiment of the present invention;

[0020] FIG5 is a partial enlarged view of the portion indicated by reference numeral Ⅰ in FIG4 ;

[0021] FIG6 is a schematic diagram of an integrated forging die forging a special-shaped forging according to an embodiment of the present invention.

[0022] Legend: 1. Upper anvil mold; 11. Upper mold body; 111. Positioning screw hole; 12. Mounting portion; 121. Positioning groove; 2. Lower forming mold; 21. Lower mold body; 22. Forming cavity; 221. Rectangular groove; 222. Disc area; 223. Buffer extension area; 3. Blank. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] As shown in Figures 1, 2, 3, 4, 5 and 6, an integrated forging die for special-shaped forgings includes an upper anvil die 1 and a lower forming die 2, wherein the upper anvil die 1 includes an upper die body 11 and a mounting portion 12; the lower forming die 2 includes a lower die body 21 and a forming cavity 22; the forming cavity 22 is composed of a rectangular groove 221 and a disc area 222; the disc area 222 is located at one end of the upper surface; the longitudinal height of the disc area 222 is less than the longitudinal height of the rectangular groove 221; the angle between the two sides of the mounting portion 12 and the upper surface of the upper die body 11 is less than ninety degrees.

[0025] In actual application, the upper anvil mold 1 is connected to the press and is responsible for extruding the workpiece so that it is formed according to the shape of the mold; the mounting portion 12 of the upper anvil mold 1 is used to be connected and fixed to the press, and the mounting portion 12 is in an inverted trapezoidal shape, that is, wide at the top and narrow at the bottom, which is convenient for locking and preventing it from falling off; rounded recesses are provided at the top corners between the two sides of the mounting portion 12 and the upper mold body 11 (as shown in Figure x), and the arc transition is provided to eliminate burrs or surface cracks generated during the manufacturing process, and to minimize cracks caused by frequent extrusion here; in actual application, according to the different interfaces of the press, a positioning groove 121 can also be provided on the mounting portion 12 to adapt to different models of presses, which can assist in positioning, increase the contact area, and make the connection between the upper anvil mold 1 and the press more secure;

[0026] Furthermore, positioning screw holes 111 may also be provided on the side of the upper mold body 11 to play a role in positioning installation and auxiliary fixation.

[0027] The lower forming die 2 is responsible for forming the workpiece. The shape of its forming cavity 22 is designed based on the shape of the workpiece to be processed and the role the die plays in the overall processing process. The opening of the forming cavity is chamfered, and the upper end of the rectangular groove 221 is slightly wider than the lower end in cross section. The side of the rectangular groove 221 away from the disc area 222 is a buffer extension area 223. In other words, the length of the rectangular groove 221 is slightly longer than the final size of the workpiece to be processed. This is because to ensure the quality of the finished product, the size of the forging is larger than the final workpiece, so that the most uniform and dense part can be retained as the finished product.

[0028] In practical applications, this application is primarily responsible for processing reactor control rod steering housing forgings. Therefore, the shape of the forming cavity 22 is a rectangular groove 221 and a circular disc area 222, which is similar to the shape of the control rod steering housing (which is a combination of a stepped rectangular forging and a circular disc forging). Due to the large size of the control rod steering housing, it is currently not suitable for mass production using die forging, nor can it be formed in one go using die forging. Therefore, in actual production, it must be divided into several steps, and the final shape is achieved through multiple processes.

[0029] For large-sized, heavy-weight, special-shaped, and small-batch workpieces such as control rod steering housings, the existing processing method mainly adopts free forging, which forges rectangular forgings and disc forgings. The total length of the rectangle and the disc is used as the basic length of the forging, the diameter of the disc is used as the basic width of the forging, and the total height of the rectangle and the disc is used as the basic height of the forging. This processing method has a large forging allowance, which can easily lead to uneven internal structure of the forging during the performance heat treatment stage. After heat treatment, the better surface structure is removed by machining chips, and the internal uneven structure becomes the product surface, which may have an adverse effect on the subsequent use of the product. At the same time, the large forging allowance also means waste of resources. At the same time, the disc is mainly formed by cutting and peeling, and a continuous metal streamline cannot be formed, which can easily cause quality problems at the connection, resulting in unstable quality of the finished product.

[0030] The mold of the present application is used in the integrated forging and pressing process of disc-shaped special-shaped forgings, which combines the manufacturing method of free forging and die forging. The mold of the present application is responsible for a part of the die forging process. Since it is the latter half of the entire process, the steel billet has been subjected to multiple free forging upsettings and has a certain shape when entering the mold of the present application for forging, becoming a multi-step rectangular billet 3; the billet 3 is placed in the lower forming die 2, and the main body is placed in the disc area 222. After aligning the center, the press drives the upper anvil die 1 to press down, and the lower forming die 2 rotates with the billet 3, pressing while spinning, and finally spinning for one circle to trim the shape and size to obtain an integrated disc-shaped special-shaped forging;

[0031] Compared with the traditional free forging method, the application of the mold in this application can realize the one-piece molding of the product, greatly shorten the processing cycle, the heat treatment size is closer to the finished product size, the difference between the internal and external metal structures is smaller, the production cycle is shortened, the production efficiency is greatly improved, raw materials are saved, and the raw material input cost of the product is greatly reduced. In addition, the connection area between the rectangle and the disc forms a continuous metal streamline, the product quality is more stable and guaranteed, and the product safety is higher.

[0032] Advantages of the implementation of this utility model:

[0033] By using the mold of this application, the product shape can be formed in one piece, which greatly shortens the processing cycle. At the same time, compared with the traditional free forging process, when forging special-shaped forgings, the heat treatment size is closer to the finished product size, and the difference between the internal and external metal structures is smaller, which greatly improves production efficiency; at the same time, it can save more raw materials and greatly reduce the raw material input cost of the product. In addition, the connection area between the rectangle and the disc forms a continuous metal streamline, and the stepped rectangle and the disc are integrated into one, which makes the product safer.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An integrated forging die for special-shaped forgings, comprising an upper anvil die (1) and a lower forming die (2), characterized in that: The upper anvil mold (1) comprises an upper mold body (11) and a mounting portion (12); the lower molding mold (2) comprises a lower mold body (21) and a molding cavity (22); the molding cavity (22) is composed of a rectangular groove (221) and a disc area (222); the disc area (222) is located at one end of the upper surface; the longitudinal height of the disc area (222) is less than the longitudinal height of the rectangular groove (221); and the angle between the two sides of the mounting portion (12) and the upper surface of the upper mold body (11) is less than ninety degrees.

2. The integrated forging die for special-shaped forgings according to claim 1, characterized in that: The opening of the molding cavity (22) is provided with a circular arc chamfer.

3. The integrated forging die for special-shaped forgings according to claim 1, characterized in that: The longitudinal cross-section of the rectangular groove (221) gradually narrows from top to bottom.

4. The integrated forging die for special-shaped forgings according to claim 1, characterized in that: The side of the rectangular groove (221) away from the disc area (222) is a buffer extension area (223).

5. The integrated forging die for special-shaped forgings according to claim 1, characterized in that: The side surface of the upper mold body (11) is provided with positioning screw holes (111); the number of the positioning screw holes (111) is at least two.

6. The integrated forging die for special-shaped forgings according to claim 1, characterized in that: Rounded recesses are provided between the two sides of the mounting portion (12) and the upper mold body (11).

7. The integrated forging die for special-shaped forgings according to claim 1, characterized in that: The mounting portion (12) is provided with a positioning groove (121).

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