Forging forming process of large square box forge piece

Abstract

The invention discloses a forging forming process for a large square box forge piece. The forging forming process comprises the following steps that S1, raw material forging treatment is conducted; s2, punching and chambering are conducted on the blank; s3, the punched blank is reheated and rolled to obtain an annular forge piece; s4, the annular forge piece is milled, and four groove angles are respectively washed on the inner wall of the annular forge piece; according to the method, the annular forge piece is rolled through a ring rolling mill, four groove angles are machined in the outer circle and the inner circle of the annular forge piece correspondingly, weak parts resisting stress deformation are obtained by reducing the local wall thickness, the stress of the annular forge piece is released, and the annular forge piece is squared and shaped into the box forge piece; the defects of long consumed time and low material utilization rate due to the fact that the solid cuboid forge piece is only milled in the hollow state in the later period are successfully overcome, the traditional operation mode of workers is broken through, and the problems of high labor intensity of operators, large potential safety hazards, excessive energy consumption and the like are solved.

Description

Technical Field

[0001] This invention relates to the field of forging technology, and in particular to a forging process for a large square box-shaped forging. Background Technology

[0002] With the progress of the times and the development of society, the forging industry has a broad market space and huge development opportunities. Behind these favorable development opportunities lies fierce market competition. A large number of new technologies, new processes, new equipment, new materials, and even new engineering theories and concepts are emerging one after another. The mechanical equipment in related fields is also gradually developing towards larger, heavier, and more irregular shapes. As a key component for alternating loads in the entire experimental equipment, box forgings are being used more and more widely. Their manufacturing and testing require high precision and strict quality control to ensure the efficient and safe operation of the experimental equipment.

[0003] Traditionally, the manufacturing of square box forgings involves two methods: first, free forging to create a solid cuboid, followed by milling to form the square box. This process is time-consuming, has low material utilization, low production efficiency, and is overly reliant on operator skills; second, steel plate welding is used. However, square box forgings manufactured using this method are prone to cracking at the weld seams when subjected to complex loads such as pressure and vibration, if the weld quality is poor, seriously affecting the safety and reliability of the equipment. This is a problem. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides a forging process for large square box-shaped forgings. A ring forging is rolled using a ring rolling mill, and four grooves are machined into the outer and inner circumferences of the ring forging. By reducing the local wall thickness, weak points resistant to stress deformation are obtained, releasing the stress in the ring forging. The ring forging is then squared and shaped into a box-shaped forging. This process solves the problems of low material utilization, low production efficiency, and excessive reliance on operator skills.

[0005] This invention is achieved through the following technical solution: A forging process for a large square box-shaped forging includes the following steps: S1. Raw material forging process: Select the cylindrical blank required for the box body material, and heat the blank. Then, the blank is upsetting and drawing through a hydraulic forging machine to obtain the blank; S2. Punching and enlarging: Use a drill bit to punch and enlarge the blank to ensure the core roller is inserted. S3. Rolling: Heat the blank and roll it using a ring rolling mill to obtain a ring forging, ensuring that the height of the ring forging is consistent with the target box body. S4. Milling the ring forging: Wait for the ring forging to cool to room temperature, and mill four grooves on the inner and outer walls of the ring forging. The position of the grooves is determined according to the length-width ratio of the target box forging and is machined accordingly to ensure that the arc segment divided by the groove is the same as the length-width ratio of the target box. S5. Square forming: The milled ring forging is reheated and then squared and widened by a hydraulic forging machine to finally obtain the box forging.

[0006] Further optimized, in step S1, the heating temperature is 1100℃-1200℃, and the upsetting and drawing are performed 8-10 times.

[0007] Further optimized, the feature is that in step S4, the slot angle opening is 120° and the depth is 15mm.

[0008] In a further optimized manner, in step S5, the pressing and shaping process controls the pressing amount of the forging machine hammer according to the length and width ratio of the target box, and adjusts it by pressing down repeatedly in 4-8 times to ensure the stability of the length and width ratio of the box.

[0009] In a further optimized manner, in step S5, the opposite sides are widened, and the two opposite box walls of the box forging are rolled first. Each box wall is pressed on both sides first, and then the middle is pressed. The pressing amount of the forging machine hammer is controlled, and the levers and frames are adjusted in time to ensure that the box wall thickness is uniform.

[0010] In a further optimized manner, in step S3, the outer diameter of the annular forging is 800 mm, the inner diameter is 570 mm, and the height is 600 mm.

[0011] In a further optimized manner, in step S5, the external dimensions of the box forging are 940mm*810mm*600mm, and the internal dimensions are 820mm*690mm*600mm.

[0012] In a further optimized manner, in step S4, the four groove corners divide the annular forging into four arc segments, and the included angles of the four arc segments are 95°, 85°, 95°, and 85°, respectively.

[0013] Further optimized, the horse lever is a square horse lever.

[0014] The beneficial effects of this invention are: This invention, based on the integral ring forging process, processes grooves into the ring forging, reduces the local wall thickness to create weak points that resist stress deformation, releases stress in the ring forging, and re-forges the ring forging into a box shape. This successfully solves the shortcomings of long time consumption and low material utilization when relying solely on milling to create a hollow state for solid cuboid forgings. It also breaks through the traditional operation methods of workers, avoiding problems such as high labor intensity, significant safety hazards, and excessive energy consumption. While saving production costs, it precisely controls the deformation of the forging material, shortens the production cycle of forgings, and greatly improves production efficiency.

[0015] The box forging obtained by this invention is similar to the finished product, which reduces material waste and improves material utilization. At the same time, it helps to control the deformation of the material more evenly, reduces the interruption of the metal fiber flow due to machining, thereby improving the microstructure and mechanical properties of the forging and improving product quality. Attached Figure Description

[0016] Figure 1 This is a diagram of the ring forging undergoing milling in step S3 of the present invention.

[0017] Figure 2 This is a milling drawing of the ring forging in this invention.

[0018] Figure 3 This is the actual object used in step S5 of the present invention for pressing and shaping. Figure 1 .

[0019] Figure 4 This is the actual object used in step S5 of the present invention for pressing and shaping. Figure 2 , Figure 5 This is a drawing of the forged box body produced in this invention. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. In the description of this invention, it should be noted that the terms "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] like Figures 1-5 As shown, the present invention provides a forging process for a large square box-shaped forging. Includes the following steps: S1. Raw material forging process: Select the cylindrical blank required for the box body material, heat the blank to a temperature of 1100℃-1200℃, and then perform upsetting and drawing through a hydraulic forging machine. The upsetting and drawing process is repeated 8-10 times to obtain the blank.

[0022] S2. Punching and enlarging: Use a drill bit to punch and enlarge the blank to ensure the core roller is inserted.

[0023] S3. Rolling: The blank is heated and rolled using a ring rolling mill. The size and temperature of the ring are monitored by a laser diameter gauge or infrared thermometer. The rolling parameters are dynamically adjusted to obtain the ring forging. The inner and outer walls of the ring forging are checked for damage. If there is damage, it is cleaned in time to ensure that the height of the ring forging is basically consistent with the target box.

[0024] S4. Milling the ring forging: After the ring forging cools to room temperature, mill four grooves on the inner and outer walls of the ring forging, with the groove height being the same as the height of the ring forging. Figure 1 (The middle groove corner has not yet been machined). The position of the groove corner is determined and machined according to the length and width ratio of the target box forging, ensuring that the arc segment divided by the groove corner is the same as the length and width ratio of the target box. S5. Square Forming: The milled ring forging is reheated and then squared and widened by a hydraulic forging machine. During square forming, the forging machine's hammer pressure is controlled according to the length-to-width ratio of the target box body. The pressure is adjusted repeatedly in 4-8 cycles to ensure a stable length-to-width ratio. Widening is achieved by rolling two opposite box walls first, pressing the two sides of each wall first, then the middle. The hammer pressure is controlled, and the forging machine's support frame is adjusted promptly to ensure uniform wall thickness, ultimately yielding the box body forging.

[0025] Among them, the forging lever is a square forging lever. When forging square box-shaped forgings, the square forging lever can make the straight edges of the box-shaped forging faster and the thickness more uniform than the traditional round forging lever. In particular, at the four right-angle positions of the box-shaped forging, the round forging lever has forging dead corners, while the square forging lever can fit tightly with the right-angle positions of the box-shaped forging without dead corners, thereby reducing forging allowance and further saving raw materials and reducing costs.

[0026] Finally, the box forgings are subjected to heat treatment such as annealing, followed by milling, grinding, and polishing to obtain the finished square box.

[0027] Example: The target is to forge a box-shaped forging with an outer wall length, width, and height of 940mm*810mm*600mm and an inner wall length, width, and height of 820mm*690mm*600mm. S1. Raw material forging process; S2. Punching and enlarging holes in the blank; S3. Roll the ring using a ring rolling mill to obtain a ring forging with an outer diameter of 800mm, an inner diameter of 570mm, and a height of 600mm. S4. Mill the ring forging to create 4 grooves. The 4 grooves divide the ring forging into 4 arc segments. The included angles of the 4 arc segments are 95°, 85°, 95°, and 85°, respectively. The groove opening is 120° and the depth is 15mm. S5. The milled ring forging is squared to obtain a box forging with external dimensions of 940mm*810mm*600mm and internal dimensions of 820mm*690mm*600mm.

[0028] All aspects not detailed herein are well-known to those skilled in the art. Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of this invention and not intended to limit it. Although the invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this invention without departing from the spirit and scope of the invention, and all such modifications and substitutions should be covered within the scope of the claims of this invention.

Claims

1. A forging process for a large square box-shaped forging, characterized in that, Includes the following steps: S1. Raw material forging process: Select the cylindrical blank required for the box material, heat the blank, and then use a hydraulic forging machine to upset and draw it to obtain a blank; S2. Punching and enlarging: Use a drill bit to punch and enlarge the blank to ensure the core roller is inserted. S3. Rolling: Heat the blank and roll it using a ring rolling mill to obtain a ring forging, ensuring that the height of the ring forging is consistent with the target box body. S4. Milling the ring forging: Wait for the ring forging to cool to room temperature, and mill 4 grooves on the inner and outer walls of the ring forging. The height of the grooves is the same as the height of the ring forging. The position of the grooves is determined and machined according to the length-width ratio of the target box forging, ensuring that the arc segment divided by the groove is the same as the length-width ratio of the target box. S5. Square forming: The milled ring forging is reheated and then squared and widened by a hydraulic forging machine to finally obtain the box forging.

2. The forging process of the large square box-shaped forging according to claim 1, characterized in that: In step S1, the heating temperature is 1100℃-1200℃, and the upsetting and drawing are performed 8-10 times.

3. The forging process of the large square box-shaped forging according to claim 1, characterized in that: In step S4, the slot opening is 120° and the depth is 15mm.

4. The forging process of the large square box-shaped forging according to claim 1, characterized in that: In step S5, the pressing and shaping process controls the pressing amount of the forging machine hammer according to the length and width ratio of the target box, and adjusts it repeatedly in 4-8 times to ensure the stability of the length and width ratio of the box.

5. The forging process of the large square box-shaped forging according to claim 1, characterized in that: In step S5, the opposite sides are widened. The two opposite box walls of the box forging are rolled first. Each box wall is pressed on both sides first, and then the middle is pressed. The pressing amount of the forging machine hammer is controlled and the lever is adjusted in time to ensure that the box wall thickness is uniform.

6. The forging process of the large square box-shaped forging according to claim 1, characterized in that: In step S3, the outer diameter of the ring forging is 800mm, the inner diameter is 570mm, and the height is 600mm.

7. The forging process of the large square box-shaped forging according to claim 6, characterized in that: In step S5, the external dimensions of the box forging are 940mm*810mm*600mm, and the internal dimensions are 820mm*690mm*600mm.

8. The forging process of the large square box-shaped forging according to claim 7, characterized in that: In step S4, the four grooves divide the annular forging into four arc segments, with the included angles of the four arc segments being 95°, 85°, 95°, and 85°, respectively.

9. The forging process of the large square box-shaped forging according to claim 1, characterized in that: The horse bar is a square horse bar.

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