Forming process of double-flange complex forgings

Abstract

This application provides a forming process for complex double-flange forgings, comprising the following steps: Step 1, preheating the mold; Step 2, placing the heated bar stock into the mold cavity and closing the mold; Step 3, under the condition of bar stock heat preservation, the punch and punch sleeve extrude the two end faces of the bar stock to form the middle flange and end flange of the forging; Step 4, one punch moves in the direction of retraction of the other punch to cut off the connecting layer in the middle of the forging; Step 5, after the punch is reset, the mold is opened, and the forging is ejected using an ejector pin. This application, by using a punch and punch sleeve to extrude the two end faces of the bar stock under heat preservation conditions to form the middle flange and end flange of the forging, and controlling one punch to move in the direction of retraction of the other punch to cut off the connecting layer in the middle of the forging, enables the forging with the middle flange and end flange to be formed in one step, simplifying the forming process of complex double-flange forgings and improving material utilization.

Description

Technical Field

[0001] This application relates to the field of metal pressure processing technology, and more specifically, to a forming process for complex double-flange forgings. Background Technology

[0002] Die forging refers to a forging method that uses dies to shape a blank on specialized die forging equipment to obtain a forging. Forgings produced by this method have the advantages of precise dimensions and small machining allowances. However, the forming process for forgings with central and end flanges is complex, and currently, no suitable die exists for one-step forming. Therefore, the inventors designed a forming process for complex forgings with double flanges. Summary of the Invention

[0003] The purpose of this application is to propose a forming process for complex double-flange forgings, which can form forgings with middle flanges and end flanges in one step, and has the advantage of simple operation.

[0004] The embodiments of this application are implemented as follows: This application provides a forming process for complex double-flange forgings, including the following steps: Step 1: Preheat the mold; Step 2: Place the heated bar stock into the mold cavity and then close the mold; Step 3: Under the condition of bar stock heat preservation, the punch and punch sleeve extrude the two end faces of the bar stock to form the middle flange and end flange of the forging; Step 4: One of the punches moves in the direction that the other punch is retracting to cut off the connecting skin in the middle of the forging; Step 5: After the punch is reset, the mold is opened, and the forging is ejected using the ejector pin.

[0005] This application uses a punch and punch sleeve to extrude the two ends of the bar stock under heat preservation conditions to form the middle flange and end flange of the forging. One punch is controlled to move in the direction of the retraction of the other punch to cut off the connecting skin in the middle of the forging, so that the forging with the middle flange and end flange can be formed in one step, simplifying the forming process of complex double flange forgings and improving the material utilization rate.

[0006] In an optional embodiment, the mold includes an upper mold assembly, a lower mold assembly, a left punch, a left punch sleeve, a right punch, and a right punch sleeve. The upper mold assembly and the lower mold assembly are positioned vertically opposite each other. The left punch sleeve is fixedly fitted on the outside of the left punch, and the right punch sleeve is slidably fitted on the outside of the right punch. The upper mold assembly, the lower mold assembly, the left punch sleeve, and the right punch sleeve together form a cavity for forming a forging with a central flange and an end flange.

[0007] In an optional embodiment, the left punch sleeve and the right punch sleeve are slidably disposed within the mold cavity formed by the upper and lower mold groups.

[0008] In an optional implementation, the cavity and the mold cavity are arranged coaxially.

[0009] In an optional implementation, heating elements are embedded inside both the upper and lower modules.

[0010] In an optional embodiment, the lower end face of the upper module is provided with a guide block, and the upper end face of the lower module is provided with a guide groove that matches the guide block.

[0011] In an optional implementation, the guide blocks are evenly distributed along the circumference of the upper module.

[0012] In an optional implementation, the push rod is telescopically located within the lower module.

[0013] In an optional implementation, the push rod is arranged vertically along the radial direction of the cavity.

[0014] In an optional embodiment, the push rod is generally arranged between the middle flange and the end flange of the forging. Attached Figure Description

[0015] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and are not intended to limit the scope of this application. In the accompanying drawings: Figure 1 This is a schematic diagram of a mold according to an embodiment of this application; Figure 2 This is a cross-sectional view of a mold according to an embodiment of this application; Figure label: 10. Install the module; 20. Lower module; 30. Left punch; 40. Right-hand strike; 50. Forgings; 60. Heating element; 11. Upper mold one; 12. Upper mold 2; 13. Upper model three; 14. Guide block; 21. Lower mold one; 22. Lower mold two; 23. Lower mold three; 24. Guide groove; 25. Top rod; 51. End flange; 52. Middle flange; 221. Groove. Detailed Implementation

[0016] Example 1 Please see Figures 1-2 In this embodiment, the forming process of complex double-flange forgings includes the following steps: Step 1: Preheat the upper module 10 and the lower module 20; Step 2: After placing the heated bar stock into the cavity of the lower mold 20, close the upper mold 10; Step 3: Under the condition of heat preservation of the bar stock, the left punch 30, right punch 40, left punch sleeve 31 and right punch sleeve 41 extrude the two ends of the bar stock to form the middle flange 52 and the end flange 51 of the forging 50. Step 4: The right punch 40 moves in the direction of the left punch 30 to cut off the connecting skin in the middle of the forging 50. Step 5: After the left punch 30 and right punch 40 are reset, the mold is opened, and the forging 50 is ejected using the ejector pin 25.

[0017] In this embodiment, under the condition of bar stock heat preservation, the left punch 30, right punch 40, left punch sleeve 31 and right punch sleeve 41 are used to extrude the two ends of the bar stock to form the middle flange 52 and end flange 51 of the forging 50. The right punch 40 is controlled to move in the direction of the left punch 30 to cut off the connecting skin in the middle of the forging 50, so that the forging with the middle flange and end flange can be formed in one step, simplifying the forming process of complex double flange forgings and improving the material utilization rate.

[0018] It should be noted that when heating the bar stock, the temperature varies depending on the material. In this embodiment, stainless steel is used as an example. The bar stock is heated to about 1150°C. The heating element 60 embedded in the mold is used to preheat the entire mold, which can maintain the temperature of the mold during operation and facilitate the heat preservation and forming of complex and difficult-to-deform metals.

[0019] In this embodiment, optionally, the mold includes an upper mold assembly 10, a lower mold assembly 20, a left punch 30, a left punch sleeve 31, a right punch 40, and a right punch sleeve 41. The upper mold assembly 10 and the lower mold assembly 20 are positioned vertically opposite each other. The left punch sleeve 31 is fixedly sleeved on the outside of the left punch 30, and the right punch sleeve 41 is slidably sleeved on the outside of the right punch 40. The upper mold assembly 10, the lower mold assembly 20, the left punch sleeve 31, and the right punch sleeve 41 together form a cavity for forming a forging 50 with a central flange 52 and an end flange 51.

[0020] It should be noted that both the upper module 10 and the lower module 20 adopt a split structure design to facilitate replacement when the mold wears out, thereby reducing mold costs. The upper module 10 is formed by combining upper mold one 11, upper mold two 12, and upper mold three 13. These three parts of the upper module 10 are connected to the same power source via connecting plates. These connecting plates are used to connect the three parts of the upper module 10 into a single unit. Downward-protruding guide blocks are provided at the four corners of the upper module 10. 14. At the same time, a semi-circular groove 221 is formed at the right end of the inner cavity of the upper die 2 12. The groove 221 is used to form the middle flange 52 of the forging 50. The diameter of the inner cavity of the upper die 2 12 is smaller than the inner diameter of the upper die 1 11 and the upper die 3 13. The inner cavities of the upper die 1 11, the upper die 2 12 and the upper die 3 13 are arranged coaxially. A step is formed between the left end of the inner cavity of the upper die 2 12 and the inner cavity of the upper die 1 11. This step is used to form the end flange 51 of the forging 50.

[0021] In this embodiment, the lower module 20 is arranged symmetrically with the upper module 10. The lower module 20 is formed by combining the lower mold 1 21, the lower mold 22 and the lower mold 3 23. Similarly, the lower mold 1 21, the lower mold 22 and the lower mold 3 23 are connected as one unit by a connecting plate. The lower module 20 is kept fixed as a whole, and the upper module 10 moves up and down relative to the lower module 20 to realize the opening and closing of the mold.

[0022] Similarly, a groove 221 is formed at the right end of the inner cavity of the lower mold 22. After the upper mold 10 and the lower mold 20 are closed, a circular mold cavity is formed. Guide grooves 24 corresponding to guide blocks 14 are provided at the four corners of the lower mold 20. By using the matching and snapping of guide blocks 14 and guide grooves 24, the closing of the mold can be guided, preventing the upper mold 10 and the lower mold 20 from being misaligned.

[0023] It should be noted that the left punch sleeve 31 is fixedly sleeved on the outside of the left punch 30, and the two move synchronously under the drive of the same power source. The outer diameter of the left punch sleeve 31 is equal to the inner diameter of the upper die 11 and the lower die 21. The end face of the left punch sleeve 31 presses the left end face of the bar stock to form the end flange 51 of the forging 50.

[0024] In addition, the right punch sleeve 41 is slidably sleeved on the outside of the right punch 40. The two are connected to different power sources, so that they can move relative to each other. The outer diameter of the right punch sleeve 41 is equal to the diameter of the upper die 3 13 and the lower die 3 23. The end face of the right punch sleeve 41 presses the right end face of the bar stock to form the middle flange 52 of the forging 50.

[0025] Optionally, the left punch 30 and the right punch 40 are designed as independent structures to facilitate quick replacement after the punches wear out. After wear, only the worn end face needs to be machined off, and other positions can be adapted for reuse. They can be processed and reused multiple times.

[0026] It should be noted that after the upper module 10 and the lower module 20 are closed, a mold cavity is formed. The left punch sleeve 31 and the right punch sleeve 41 surround the mold cavity to form a cavity for forming the forging 50. The cavity is arranged coaxially with the mold cavity.

[0027] It should also be noted that, in order to ensure that the forging 50 can be easily demolded after forming, a telescopic ejector rod 25 is provided inside the lower die 22 of the lower die assembly 20. The ejector rod 25 is arranged vertically along the radial direction of the cavity and is located between the middle flange 52 and the end flange 51 of the forging 50. The ejector rod 25 is connected to an independent power source and extends into the cavity under the drive of the power source, thereby ejecting the formed forging 50.

[0028] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A forming process for complex double-flange forgings, characterized in that, Includes the following steps: Step 1: Preheat the mold; Step 2: Place the heated bar stock into the mold cavity and then close the mold; Step 3: Under the condition of bar stock heat preservation, the punch and punch sleeve extrude the two end faces of the bar stock to form the middle flange and end flange of the forging; Step 4: One of the punches moves in the direction that the other punch is retracting to cut off the connecting skin in the middle of the forging; Step 5: After the punch is reset, the mold is opened, and the forging is ejected using the ejector pin; The mold includes an upper mold assembly, a lower mold assembly, a left punch, a left punch sleeve, a right punch, and a right punch sleeve. The upper mold assembly and the lower mold assembly are positioned vertically opposite each other. The left punch sleeve is fixedly fitted onto the outside of the left punch, and the right punch sleeve is slidably fitted onto the outside of the right punch. The upper mold assembly, the lower mold assembly, the left punch sleeve, and the right punch sleeve together form a cavity for forming the forging with the central flange and the end flanges. The upper mold assembly... The forging is formed by combining upper mold one, upper mold two, and upper mold three. The right end of the inner cavity of upper mold two has a semi-circular groove for forming the middle flange of the forging. The diameter of the inner cavity of upper mold two is smaller than the inner diameter of upper mold one and upper mold three. The inner cavities of upper mold one, upper mold two, and upper mold three are arranged coaxially. A step is formed between the left end of the inner cavity of upper mold two and the inner cavity of upper mold one. The step is used to form the end flange of the forging.

2. The forming process for complex double-flange forgings as described in claim 1, characterized in that, The left punch sleeve and the right punch sleeve are slidably disposed within the mold cavity formed by the upper module and the lower module.

3. The forming process for complex double-flange forgings as described in claim 1, characterized in that, The cavity and the mold cavity are arranged coaxially.

4. The forming process for complex double-flange forgings as described in claim 1, characterized in that, Heating elements are embedded inside both the upper module and the lower module.

5. The forming process for complex double-flange forgings as described in claim 1, characterized in that, The lower end face of the upper module is provided with a guide block, and the upper end face of the lower module is provided with a guide groove that matches the guide block.

6. The forming process for complex double-flange forgings as described in claim 5, characterized in that, The guide blocks are evenly distributed along the circumference of the upper module.

7. The forming process for complex double-flange forgings as described in claim 1, characterized in that, The push rod is telescopically mounted within the lower module.

8. The forming process for complex double-flange forgings as described in claim 7, characterized in that, The push rod is arranged vertically along the radial direction of the cavity.

9. The forming process for complex double-flange forgings as described in claim 8, characterized in that, The push rod is generally arranged between the middle flange and the end flange of the forging.

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