Multidirectional die forging forming die and forming method for flange forgings with different diameters on two sides

Abstract

The invention relates to the technical field of different-diameter flange machining, in particular to a multidirectional die forging forming die and a multidirectional die forging forming method for a double-side different-diameter flange forge piece, and adopts the multidirectional die forging forming die and the multidirectional die forging forming method for the double-side different-diameter flange forge piece. The double-side different-diameter flange forge piece which is free of folding and full in forming can be formed from a cylindrical blank through one-fire one-forging, the requirement for the size precision of the diameter and the length of the blank is not high, the requirement for the placing position precision of the blank is also not high, the forging process is simple and easy to operate, automation can be achieved, the yield and the production efficiency of the forge piece are improved, and the production cost is reduced. And the production cost of the double-side different-diameter flange forge piece is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of processing flanges with different diameters, in particular to a multi-directional die forging forming die and a forming method for a double-sided flange forging with different diameters. Background Art

[0002] Rotating forgings with flanges of different diameters on both sides of the axial direction, such as Figure 5 As shown in the figure, when multi-directional die forging is used, the appropriate forming method is to place the forging axially horizontally, adopt the horizontal die splitting method, and place the blank horizontally on the annular cavity where the middle body is located. The left and right cavities are through holes with the same diameter as the flanges. The flanges on both sides are formed by upsetting deformation through the opposite extrusion of the punches on both sides. However, this method has strict requirements on the initial position of the blank. First, the blank needs to be placed in the annular cavity where the middle body is located according to the principle of equal volume, and the discharge accuracy requirement is high. Second, the blank on one side of the large flange should be long, while the length of the middle body cavity where the blank is placed is short. The blank will tilt toward the direction of the heavier large flange cavity due to the weight difference on both sides. When the double-sided punches are pressed against each other again, forging defects such as folding and incomplete filling will occur due to the tilt of the blank. Summary of the invention

[0003] The present invention aims to solve the above-mentioned problem, thereby providing a multi-directional die forging forming die and a forming method for a double-sided different-diameter flange forging.

[0004] The present invention solves the above-mentioned problem by adopting the following technical solution: A multi-directional die forging die for a double-sided different-diameter flange forging comprises an upper die and a lower die. After the upper die and the lower die are combined, a first cavity is formed on one side, and a second cavity is formed on the other side. After the upper die and the lower die are combined, a cylindrical blank is clamped between the two, and two ends of the blank are respectively located in the first cavity and the second cavity. A first punch is arranged in the first cavity, a second punch is arranged in the second cavity, and an annular cavity connected to the second cavity is also arranged in the second cavity.

[0005] Furthermore, a countersunk hole is formed on the end face of the first punch located in the first cavity, and after the first punch is pushed into the first cavity, the end of the cylindrical blank can be inserted into the countersunk hole, thereby preventing the end of the cylindrical blank from tilting during the extrusion process.

[0006] Furthermore, a boss is provided on the end face of the second punch located in the second hole cavity; after the second punch extrude the cylindrical blank, the boss is partially pressed into the end face of the cylindrical blank, so that a ring-shaped process allowance is formed on the end face of the cylindrical blank, which is the key to avoiding folding defects when forming the flange by extrusion deformation.

[0007] Furthermore, a limiting clamp ring is integrally formed on the second punch to limit the second punch to prevent excessive extrusion.

[0008] Furthermore, a through hole communicating with the interior of the second cavity is provided on the lower die, and a punch is installed in the through hole to facilitate demoulding of the forging.

[0009] A multi-directional die forging method for a double-sided reduced-diameter flange forging is performed according to the following steps: Step 1: Install the mold: Install the mold according to the above mold structure, wherein the lower mold is connected to the workbench of the multi-directional die forging press, and the upper mold is connected to the moving beam of the multi-directional die forging press; the first punch and the second punch are respectively connected to the horizontal cylinder of the multi-directional die forging press; the top punch is connected to the lower ejection cylinder; Step 2: Blank heating and mold preheating: Heat the cylindrical blank to 1220℃ and keep it warm for 30 minutes; preheat the mold to above 150℃; Step 3: Unloading: Make the upper mold in the open state, clamp the cylindrical blank that has been heated to temperature and kept warm for 30 minutes and has been dephosphorized and descaled, and place it horizontally on the semicircular groove cavity of the lower mold, and close the upper mold; Step 4: Positioning the blank: The first punch is pushed into the first hole, and the blank enters the countersunk hole of the first punch near the end of the first punch. Then the second punch is pushed into the second hole, pushing the cylindrical blank to move to the left and causing a certain deformation of the section of the cylindrical blank located in the first hole. Step 5: Forging: The first punch is pushed into the first cavity to form a large flange on the left side of the cylindrical blank, which has been slightly deformed on the left end, by upsetting deformation. Then the second punch is pushed into the second cavity to form a small flange on the right side of the cylindrical blank by closed extrusion deformation. The forming is completed; Step 6: Demolding of forgings: The first punch and the second punch release the pressure, the upper die returns upward to open the die, and then the first punch and the second punch retreat respectively to separate from the forging, the forging remains in the lower die, and the top punch moves upward to eject the forging from the lower die to complete the demolding of the forging.

[0010] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: By adopting the multi-directional die forging die and forming method for double-sided different-diameter flange forgings described in the present invention, a cylindrical blank can be formed into a double-sided different-diameter flange forging without folding and with full forming through one-fire-one-forging, and the dimensional accuracy requirements for the diameter and length of the blank are not high, and the placement position accuracy requirements for the blank are not high. The forging process is simple and easy to operate, and can be automated, thereby improving the forging qualification rate and production efficiency, and reducing the production cost of the double-sided different-diameter flange forgings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the embodiment of the present invention in use; Figure 3This is a schematic diagram of the structure of the embodiment of the present invention after forging is completed; Figure 4 This is a schematic diagram of the structure of a flange forging after forging is completed in an embodiment of the present invention; Figure 5 It is a schematic diagram of the structure of a conventional flange forging; Marked in the figure are: first punch 1, lower die 2, blank 3, top punch 4, upper die 5, second punch 6, flange forging 7, first hole cavity 8, second hole cavity 9, annular cavity 10, counterbore 11, boss 12, limit clamp 13, conventional flange forging 14. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0013] See also Figure 1-Figure 4 A multi-directional die forging forming die for a double-sided different-diameter flange forging includes an upper die 5 and a lower die 2. After the upper die 5 and the lower die 2 are molded together, a first cavity 8 is formed on one side, and a second cavity 9 is formed on the other side. After the upper die 5 and the lower die 2 are molded together, a cylindrical blank 3 is clamped between the two. The two ends of the blank 3 are respectively located in the first cavity 8 and the second cavity 9. A first punch 1 is arranged in the first cavity 8, and a second punch 6 is arranged in the second cavity 9. The second cavity 9 is also provided with an annular cavity 10 connected with the second cavity 9.

[0014] Furthermore, a countersunk hole 11 is formed on the end face of the first punch 1 located in the first cavity 8. After the first punch 1 is pushed into the first cavity 8, the end of the cylindrical blank 3 can be inserted into the countersunk hole 11, thereby preventing the end of the cylindrical blank 3 from tilting during the extrusion process.

[0015] Furthermore, a boss 12 is provided on the end face of the second punch 6 located in the second cavity 9; after the second punch 6 extrude the cylindrical blank 3, the boss 12 is partially pressed into the end face of the cylindrical blank 3, so that a ring-shaped process allowance is formed on the end face of the cylindrical blank 3. Compared with the conventional flange forging 14, the extra process allowance is the key to avoiding folding defects when forming the flange by extrusion deformation.

[0016] Furthermore, a limiting clamp ring 13 is integrally formed on the second punch 6 to limit the second punch 6 to prevent excessive extrusion.

[0017] Furthermore, a through hole communicating with the interior of the second cavity 9 is provided on the lower die 2 , and a punch 4 is installed in the through hole to facilitate demoulding of the flange forging 7 .

[0018] A multi-directional die forging method for a double-sided reduced-diameter flange forging is performed according to the following steps: Step 1: Install the mold: Install the mold according to the above mold structure, wherein the lower mold 2 is connected to the workbench of the multi-directional die forging press, and the upper mold 5 is connected to the movable beam of the multi-directional die forging press; the first punch 1 and the second punch 6 are respectively connected to the horizontal cylinder of the multi-directional die forging press; the top punch 4 is connected to the lower ejection cylinder; Step 2: Blank heating and mold preheating: Heat the cylindrical blank 3 to 1220°C and keep it warm for 30 minutes; preheat the mold to above 150°C; Step 3: Discharging: Make the upper mold 5 in an open mold state, clamp the cylindrical blank 3 that has been heated to a temperature and kept warm for 30 minutes and has been dephosphorized and descaled, and place it horizontally on the semicircular groove cavity of the lower mold 1, and close the upper mold 5; Step 4: blank positioning: the first punch 1 is pushed into the first cavity 8, and the blank 3 enters the countersunk hole 11 of the first punch 1 near the end of the first punch 1, and then the second punch 6 is pushed into the second cavity 9, pushing the cylindrical blank 3 to move to the left and causing a certain deformation of the section of the cylindrical blank 3 located in the first cavity 8; the blank position can be adjusted by controlling the displacement of the punches on both sides to achieve precise volume distribution, and the initial discharge accuracy does not need to be strictly required; Step 5: Forging: The first punch 1 is pushed into the first cavity 8 to form a large flange on the left side of the cylindrical blank 3 which has been slightly deformed at the left end by upsetting deformation, and then the second punch 6 is pushed into the second cavity 9 to form a small flange on the right side of the cylindrical blank 3 by closed extrusion deformation, and the forming is completed; Step 6: Demolding of forgings: The first punch 1 and the second punch 6 release the pressure, the upper die 5 returns upward to open the die, and then the first punch 1 and the second punch 6 retreat and separate from the flange forging 7 respectively, the flange forging 7 remains in the lower die, and the top punch 4 moves upward to eject the flange forging 7 from the lower die 2, completing the demolding of the flange forging 7.

[0019] By adopting the multi-directional die forging die and forming method for double-sided different-diameter flange forgings described in the present invention, a cylindrical blank can be formed into a double-sided different-diameter flange forging without folding and with full forming through one-fire-one-forging, and the dimensional accuracy requirements for the diameter and length of the blank are not high, and the placement position accuracy requirements for the blank are not high. The forging process is simple and easy to operate, and can be automated, thereby improving the forging qualification rate and production efficiency, and reducing the production cost of the double-sided different-diameter flange forgings.

[0020] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A multi-directional die forging die for double-sided different-diameter flange forgings, comprising an upper die and a lower die, characterized in that: A first cavity is formed on one side after the upper die and the lower die are closed, and a second cavity is formed on the other side. After the upper die and the lower die are closed, the cylindrical blank is clamped between the two, and the two ends of the blank are respectively located in the first cavity and the second cavity. A first punch is arranged in the first cavity, and a second punch is arranged in the second cavity. The second cavity is also provided with an annular cavity connected with the second cavity.

2. The multi-directional die forging die for double-sided different-diameter flange forging according to claim 1, characterized in that: A countersunk hole is formed on the end surface of the first punch located in the first cavity. After the first punch is pushed into the first cavity, the end of the blank can be inserted into the countersunk hole.

3. The multi-directional die forging die for double-sided different-diameter flange forging according to claim 1, characterized in that: A boss is arranged on the end surface of the second punch located in the second cavity.

4. The multi-directional die forging die for double-sided different-diameter flange forging according to claim 1, characterized in that: A limiting clamp ring is integrally formed on the second punch.

5. The multi-directional die forging die for double-sided different-diameter flange forging according to claim 1, characterized in that: The lower die is provided with a through hole which is communicated with the interior of the second cavity, and a punch is arranged in the through hole.

6. A multi-directional die forging method for double-sided different-diameter flange forgings, characterized in that: Follow these steps: Step 1: Install the mold: Install the mold according to the above mold structure, wherein the lower mold is connected to the workbench of the multi-directional die forging press, and the upper mold is connected to the moving beam of the multi-directional die forging press; the first punch and the second punch are respectively connected to the horizontal cylinder of the multi-directional die forging press; the top punch is connected to the lower ejection cylinder; Step 2: Blank heating and mold preheating: Heat the cylindrical blank to 1220℃ and keep it warm for 30 minutes; preheat the mold to above 150℃; Step 3: Unloading: Make the upper mold in the open state, clamp the cylindrical blank that has been heated to temperature and kept warm for 30 minutes and has been dephosphorized and descaled, and place it horizontally on the semicircular groove cavity of the lower mold, and close the upper mold; Step 4: Positioning the blank: The first punch is pushed into the first hole, and the blank enters the countersunk hole of the first punch near the end of the first punch. Then the second punch is pushed into the second hole, pushing the cylindrical blank to move to the left and causing a certain deformation of the section of the cylindrical blank located in the first hole. Step 5: Forging: The first punch is pushed into the first cavity to form a large flange on the left side of the cylindrical blank, which has been slightly deformed on the left end, by upsetting deformation. Then the second punch is pushed into the second cavity to form a small flange on the right side of the cylindrical blank by closed extrusion deformation. The forming is completed; Step 6: Demolding of forgings: The first punch and the second punch release the pressure, the upper die returns upward to open the die, and then the first punch and the second punch retreat respectively to separate from the forging, the forging remains in the lower die, and the top punch moves upward to eject the forging from the lower die to complete the demolding of the forging.

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