Integrated forging and stamping die for special-shaped forgings

Abstract

The utility model discloses an integrated forging and stamping die for a special-shaped forge piece, which comprises an upper anvil die and a lower forming die, and the upper anvil die comprises an upper die main body and a mounting part; the lower forming die comprises a lower die main 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 smaller than that of the rectangular groove; the included angles between the two sides of the installation part and the upper surface of the upper die body are smaller than 90 degrees. Compared with a free forging method, the die for machining the special-shaped forge piece with the disc has the advantages that the heat treatment size is closer to the size of a finished product, the internal and external structure difference of metal is smaller, the production period is greatly shortened, the raw material consumption is lower, and the product raw material input cost is greatly reduced; and the rectangle with the step and the disc are integrally formed, so that the product safety is higher.

Description

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 materials that strongly absorb neutrons but do not undergo fission. As the control rods move in the reactor, the number of neutrons absorbed changes, thereby changing the reactivity of the reactor. As an important shell component, the reactor control rod steering shell body forging bears a huge load. It belongs to the first-level nuclear safety and first-level nuclear quality assurance equipment, with complex manufacturing processes, strict quality control and process control, and to a certain extent, represents the highest level of control rod shell component manufacturing capabilities.

[0003] The reactor control rod steering part housing body forging is a combination of a stepped rectangular forging and a disc forging. For this special-shaped forging manufacturing process, currently, free forging is generally used directly at home and abroad to forge a rectangular forging and a disc forging, with the total length of the rectangle and the disc as the basic length of the forging, the diameter of the disc as the basic width of the forging, and the total height of the rectangle and the disc as the basic height of the forging. The material consumption weight of the product forged using this method is almost five times that of the product forging, and the forging margin is large, resulting in 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 overall machining margin of the forging forged by this method is large, which is also a waste of resources for manufacturers. Large machining margins consume more manpower and material resources, generate more production waste, and have a long production cycle. In addition, the disc is cut and peeled, and a continuous metal streamline cannot be formed. It is easy to cause major quality problems at the connection, and the quality is very unstable. Utility Model Content

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

[0005] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[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 utility model, a circular arc chamfer is arranged 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 utility model, a side of the rectangular groove away from the disc area is a buffer extension area.

[0010] According to one aspect of the utility model, a side surface of the upper mold body is provided with positioning screw holes; the number of the positioning screw holes is at least two.

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

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

[0013] Advantages of the utility model:

[0014] By using the mold of the present 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, more raw materials can be saved, greatly reducing the raw material input cost of the product, and 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 drawings required for use in the embodiments will be briefly introduced below. 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] Figure 1 It is a structural schematic diagram of an integrated forging die for special-shaped forgings according to the utility model;

[0017] Figure 2It is a plan view of the front and back of the lower forming die according to the embodiment of the utility model;

[0018] Figure 3 for Figure 2 A cross-sectional view along the lines indicated by reference numerals AA and BB;

[0019] Figure 4 It is a side view of the upper anvil mold described in the embodiment of the utility model;

[0020] Figure 5 for Figure 4 A partial enlarged view of the portion indicated by reference numeral Ⅰ;

[0021] Figure 6 It is a schematic diagram of a special-shaped forging integrated forging die during forging according to an embodiment of the utility model.

[0022] Legend: 1. Upper anvil die; 11. Upper die body; 111. Positioning screw hole; 12. Mounting portion; 121. Positioning groove; 2. Lower forming die; 21. Lower die 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 drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, 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 practical applications, 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 connect and fix with 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 from falling off; the top corners between the two sides of the mounting portion 12 and the upper mold body 11 are provided with rounded corners (such as Figure 5 As shown), the arc transition is set to eliminate burrs or surface cracks generated during the manufacturing process, and to minimize cracks caused by frequent extrusion here; in practical applications, according to different interfaces of the press, the mounting portion 12 may also be provided with a positioning groove 121 for adapting to different types 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, a positioning screw hole 111 may also be provided on the side of the upper mold body 11 to play a role in positioning and installing and assisting in fixing.

[0027] The lower forming die 2 is responsible for forming, and the shape of its forming cavity 22 is designed according to the shape of the workpiece to be processed and the link that the die is responsible for in the entire processing process; the opening of the forming cavity is set with an arc chamfer, and the upper end of the cross-section of the rectangular groove 221 is slightly wider than the lower end; the side of the rectangular groove 221 away from the disc area 222 is a buffer extension area 223, that is, the length of the rectangular groove 221 is slightly longer than the final size of the processed workpiece, because in order to ensure the quality of the finished product, the size of the forging will be larger than the size of the final workpiece, so as to retain the most uniform and dense part as the finished product;

[0028] In practical applications, the present application is mainly responsible for processing the reactor control rod steering member housing body forgings; therefore, the shape of the forming cavity 22 is a rectangular groove 221 and a disc area 222, which is close to the shape of the control rod steering member housing (its shape is a combination of a stepped rectangular forging and a disc forging); since the control rod steering member is relatively large in size, it is not suitable for mass production using the die forging method at present, and it is also impossible to form it in one go through die forging, so it needs to be divided into several processes in actual production, and it can only be finally formed after 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 margin, 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 margin also means a 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 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, and becomes 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, while rotating and pressing, and finally spinning for one round, trimming the shape and size, and obtaining an integrated disc-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, the 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 utility model:

[0033] By using the mold of the present 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, more raw materials can be saved, greatly reducing the raw material input cost of the product, and 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 is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope 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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