Forming forging die and forging method for hub axle tube of stepped structure

Abstract

The invention discloses a forming forging die and a forging method for a hub axle tube of a stepped structure, and belongs to the technical field of axle tube forging die. A rotating screw rod, a moving seat, a top frame and an overturning mounting frame are arranged, a rotating motor is controlled to drive bevel gears to rotate, and the rotating screw rod is controlled to rotate synchronously through meshing of two sets of bevel gears; the movable seat slides towards one side of the base on the surfaces of the rotating screw rod and the two sets of limiting sliding rods, the top frames on the two sides of the movable seat rotate between the corresponding first rotating frame and the corresponding second rotating frame, and therefore one side of the overturning mounting frame is jacked up, and the overturning mounting frame is obliquely overturned at the top of the base; the first forming die, the second forming die and the third forming die on the top of the overturning mounting frame are inclined synchronously, upsetting blanks, forming blanks and reverse extrusion blanks which are formed through forging in the first forming die, the second forming die and the third forming die can be taken out conveniently, and forging machining can be conducted by replacing the machining positions of the upsetting blanks, the forming blanks and the reverse extrusion blanks.

Description

Technical Field

[0001] The invention belongs to the technical field of axle tube forging dies, and in particular relates to a forming forging die and a forging method for a wheel hub axle tube with a stepped structure. Background Art

[0002] The automobile wheel hub is one of the important parts of the vehicle. One of the main components of the automobile wheel hub is the hub axle tube, which is mainly used for stamping and welding bridge shells of various types of trucks and buses and wheel side supports at both ends of the drive axle of engineering machinery. It is welded at both ends of the bridge shell, and the half shaft passes through the middle of the axle tube. During the driving process of the car, the hub axle tube not only has to bear the weight of the entire body and the cargo on the vehicle, but also has to bear the complex and changeable stress caused by road conditions. The quality of the hub axle tube affects the stability and safety of the vehicle. The forging process can form high-quality forgings, which have metal streamlines distributed along the axial direction, dense metal structure, and good mechanical properties.

[0003] At present, domestic manufacturers usually use seamless steel pipes for local heating of this type of stepped shaft tube, and then rough extrusion molding. This process is difficult to form ideal metal streamlines and the inner hole is uneven in actual applications. At the same time, the metal density and internal quality of the deformed part are improved, while the metal structure of the non-deformed part remains in the raw material state, resulting in differences in the internal quality of the same blank.

[0004] The prior art discloses an automobile hub axle tube forming die with application number: CN201120188741.9, which adopts medium frequency heating of solid bar material, performs a first pressing in a first pressing die, presses the solid bar material into the finished product shape and size, and transfers the pressed blank into a secondary extrusion forming die. Through the extrusion of the extrusion punch and the secondary extrusion forming die, the metal structure is extended in the reverse direction, the full length of the product is lengthened, and the hub axle tube forms an axial full-fiber metal streamline structure and a dense metal structure, which greatly improves the mechanical properties of the hub axle tube. The use of this process can ensure the metal streamline structure and physical properties of the axle tube, but increases the processing allowance at one end of the blank, resulting in a waste of raw materials, increasing the tool loss and processing time of machining, and greatly increasing the production cost of the stepped structure axle tube.

[0005] When the existing stepped structure wheel hub shaft tube forming forging die takes out the roughing blank, forming blank and back-extruded blank from the corresponding forming die one, forming die two and forming die three, it is necessary to control the top plate to lift the roughing pressure head, forming punch and back-extruded punch to a higher position so that the roughing blank, forming blank and back-extruded blank can be taken out from the corresponding forming die one, forming die two and forming die three. It is not convenient to take out and replace the roughing blank, forming blank and back-extruded blank, so improvement is needed. Summary of the invention

[0006] In order to overcome the above-mentioned defects, the present invention provides a forming forging die and forging method for a stepped structure wheel hub axle tube, which solves the problem that the existing forming forging die for a stepped structure wheel hub axle tube needs to control the top plate to lift the roughing press head, forming punch and back-extrusion punch to a higher position when taking out the roughing blank, forming blank and back-extrusion blank from the corresponding forming die one, forming die two and forming die three, which makes it inconvenient to take out and replace the roughing blank, forming blank and back-extrusion blank.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a forming forging die for a stepped structure wheel hub shaft tube, comprising a base, a flip mounting frame is rotatably mounted on the top of the base, a mounting seat 1, a mounting seat 2 and a mounting seat 3 are fixedly mounted on the bottom of the flip mounting frame, a forming die 1, a forming die 2 and a forming die 3 are respectively fixedly mounted on the top of the flip mounting frame, a roughing blank, a forming blank and a back-extrusion blank are respectively arranged inside the forming die 1, the roughing blank and the forming die 3, and a roughing pressure head, a forming punch and a back-extrusion punch are respectively arranged on the top of the forming die 1, the roughing blank and the forming die 3.

[0008] As a further solution of the present invention: a top plate is fixedly installed on the top of the roughing punch, the forming punch and the reverse extrusion punch, side plates are symmetrically fixedly installed on the bottom of both sides of the base, and two groups of telescopic sliding rods are respectively fixedly installed between the two sides of the bottom of the top plate and the two groups of side plates.

[0009] As a further scheme of the present invention: a rotating screw is rotatably installed between the central positions on both sides of the inner wall of the base, and one end of the rotating screw passes through the base and is fixedly installed with a bevel gear, a rotating motor is fixedly installed on one side of the base, and a bevel gear is fixedly installed on the output end of the rotating motor, and the two sets of bevel gears are meshed with each other, and limiting slide bars are symmetrically fixedly installed on both sides of the rotating screw inside the base, and a moving seat is slidably installed on one side of the surface of the rotating screw and the two sets of limiting slide bars, and a rotating frame one is symmetrically fixedly installed on both ends of one side of the moving seat, a top frame is rotatably installed on the top of the rotating frame one, and a rotating frame two is rotatably installed on the end of the top frame away from the rotating frame one, and the rotating frame two is fixedly connected to the bottom of the flip mounting frame.

[0010] As a further solution of the present invention: four groups of limiting slide grooves are provided at equal angles on the inner wall of the mounting seat, an electric push rod is fixedly installed on the inner bottom of the mounting seat, a push rod seat is fixedly installed on the top of the electric push rod, and four groups of limiting protrusions are fixedly installed at equal angles on the bottom of the surface of the push rod seat, and the limiting protrusions correspond to the positions of the limiting slide grooves.

[0011] As a further solution of the present invention: the structures of the mounting seat 1, the mounting seat 2 and the mounting seat 3 are the same, and the shapes of the mounting seat 1, the mounting seat 2 and the mounting seat 3 correspond to the forming mold 1, the forming mold 2 and the forming mold 3 respectively.

[0012] As a further solution of the present invention: the upsetting pressure head corresponds to the top position of the upsetting blank and has the same shape as the top of the upsetting blank, and the upsetting blank has the same shape as the inner wall of the first forming die.

[0013] As a further solution of the present invention: the surface of the top of the forming punch is symmetrically provided with air holes, an inner punch is slidably installed on the bottom of the forming punch, and the gap between the forming punch and the inner punch is the same as the shape of the top of the forming blank, and the forming blank corresponds to the inner wall of the forming mold two.

[0014] As a further solution of the present invention: the bottom of the back-extrusion punch corresponds to the top of the back-extrusion blank in position and has the same shape, and the back-extrusion blank corresponds to the inner wall of the forming die three.

[0015] A forging method for a forming forging die of a stepped structure wheel hub shaft tube, the forging method comprising the following steps:

[0016] The forging device is installed in the base and the top plate is fixedly connected to the forging working position of the forging device, and the top plate is controlled to move up to drive the roughing ram, the forming punch and the reverse extrusion punch to move up and away from the flip mounting frame. When the rotating motor is controlled to rotate, the rotating screw is rotated synchronously, so that the movable seat moves inside the base toward the rotating motor, and the top frame rotates between the rotating frame 1 and the rotating frame 2, and one side of the flip mounting frame is lifted up until the flip mounting frame is tilted at a certain angle at the top of the base, and the heated rods, roughing blanks and forming blanks are respectively placed in the forming mold 1, the forming mold 2 and the forming mold 3, and the rotating motor is controlled to flip so that the top frame pulls the flip mounting frame to rotate on the top of the base until the flip mounting frame is close to the top of the base, and the forging working position of the forging device is controlled to be pressed down, driving the top plate to move down, so that the roughing ram, the forming punch and the reverse extrusion punch are pressed into the corresponding forming mold 1, the forming mold 2 and the forming mold 3, and the heated rods, roughing blanks and forming blanks are forged;

[0017] After the forging is completed, the forging working position of the forging device is controlled to move up, driving the top plate to move up, so that the roughing ram, forming punch and back-extrusion punch are pulled out from the corresponding forming die one, forming die two and forming die three, the rotating motor is controlled to rotate to drive the rotating screw to rotate, and the top frame is controlled to lift one side of the flip mounting frame, so that the top of the forming die one, forming die two and forming die three is away from the bottom of the roughing ram, forming punch and back-extrusion punch, and the electric push rod is controlled to extend to eject the roughing blank forged in the forming die one out of the forming die one, and at the same time, the forming blank and back-extrusion blank in the forming die two and forming die three are controlled to be ejected, and the ejected roughing blank, forming blank and back-extrusion blank are replaced in position, and the steps are repeated until the bar is forged into a back-extrusion blank and taken out from the forming die three.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, a rotating screw, a moving seat, a top frame and a flip mounting frame are set to control the rotating motor to drive the bevel gear to rotate, and the rotating screw is controlled to rotate synchronously through the meshing of the two sets of bevel gears, so that the moving seat slides toward one side of the base on the surface of the rotating screw and the two sets of limit slide bars, and the top frames on both sides of the moving seat rotate between the corresponding rotating frame 1 and rotating frame 2, thereby lifting one side of the flip mounting frame, so that the flip mounting frame is tilted and flipped on the top of the base, so that the forming mold 1, forming mold 2 and forming mold 3 on the top of the flip mounting frame are tilted synchronously, so that the roughened blanks, forming blanks and reverse extrusion blanks that have been forged and formed in the forming molds 1, 2 and 3 are taken out, and the processing positions of the roughened blanks, forming blanks and reverse extrusion blanks are replaced for forging.

[0020] 2. In the present invention, by setting a mounting seat 1, an electric push rod, a push rod seat and a limiting protrusion, after the flip mounting frame is tilted at a certain angle at the top of the base, the electric push rod is controlled to extend to push the push rod seat out from the inside of the mounting seat 1, driving the limiting protrusion on the surface of the push rod seat to slide inside the limiting slide groove corresponding to the inner wall of the mounting seat 1, ensuring that the push rod seat will not deflect inside the mounting seat 1, and at the same time, the roughened blank is pushed out from the inside of the forming mold 1, and the mounting seat 2 and the mounting seat 3 are controlled to synchronously push the formed blank and the back-extruded blank out of the inside of the forming mold 2 and the forming mold 3, so as to facilitate the removal of the roughened blank, the formed blank and the back-extruded blank.

[0021] 3. In the present invention, by setting a forming die one, a forming die two, a roughing ram and a forming punch, the roughing ram is controlled to roughen the bar blank inside the forming die one to form a roughed blank of a corresponding shape, and then the formed roughed blank is placed inside the forming die two, and the forming punch and the inner punch are controlled to extrude the roughed blank inside the forming die two, so that an ideal forming blank is forged, and there is a gap between the inner cavity of the forming punch and the outer circle of the upper part of the forming blank, which avoids the stress on the inner cavity of the forming punch during forming in the prior art, and the forming blank fills the inner cavity of the forming punch, causing the forming blank and the forming die two to lock, resulting in the forming blank being difficult to demold, and finally the forming blank is placed inside the forming die three, and the reverse extrusion punch is controlled to reversely extrude the forming blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the expanded cross-sectional structure of the present invention;

[0023] Figure 2 It is a cross-sectional structural schematic diagram of the base, the rotating screw and the moving seat of the present invention;

[0024] Figure 3 It is a cross-sectional structural schematic diagram of the mounting seat 1, the push rod seat and the limiting protrusion of the present invention;

[0025] Figure 4 It is a schematic cross-sectional structure diagram of the cooperation of the roughening pressure head, the forming die 1 and the roughening blank of the present invention;

[0026] Figure 5 It is a schematic diagram of the cross-sectional structure of the forming punch, the inner punch, the second forming die and the forming blank of the present invention;

[0027] Figure 6 It is a schematic diagram of the cross-sectional structure of the cooperation of the back-extrusion punch, the forming die 3 and the back-extrusion blank of the present invention;

[0028] In the figure: 1. base; 101. rotating screw; 102. bevel gear; 103. rotating motor; 104. limiting slide bar; 105. moving seat; 106. rotating frame one; 107. top frame; 108. rotating frame two; 2. side plate; 3. telescopic slide bar; 4. top plate; 5. roughening pressure head; 6. forming punch; 601. air vent; 7. inner punch; 8. reverse extrusion punch; 9. flip mounting frame; 10. mounting seat one; 1001. limiting slide groove; 1002. electric push rod; 1003. top rod seat; 1004. limiting bump; 11. mounting seat two; 12. mounting seat three; 13. forming die one; 14. roughening blank; 15. forming die two; 16. forming blank; 17. forming die three; 18. reverse extrusion blank. DETAILED DESCRIPTION

[0029] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0030] like Figure 1-6 As shown, the present invention provides a technical solution: a forming forging die for a stepped structure wheel hub shaft tube, comprising a base 1, a rotating screw 101 is rotatably installed between the central positions on both sides of the inner wall of the base 1, and one end of the rotating screw 101 passes through the base 1 and is fixedly installed with a bevel gear 102, a rotating motor 103 is fixedly installed on one side of the base 1, and the output end of the rotating motor 103 is fixedly installed with a bevel gear 102, by providing a rotating motor 103, the rotating motor 103 is controlled to rotate forward and reverse, and through the meshing of two sets of bevel gears 102, the forward and reverse rotation of the rotating motor 103 is transmitted to the rotating screw 101, thereby controlling the rotating screw 101 to rotate forward and reverse, so that the moving seat 105 moves on the surface of the rotating screw 101;

[0031] The two sets of bevel gears 102 mesh with each other, and the inside of the base 1 is symmetrically fixedly installed with limit slide bars 104 on both sides of the rotating screw 101. A moving seat 105 is slidably installed on one side of the surface of the rotating screw 101 and the two sets of limit slide bars 104. Because the limit slide bars 104 are provided, when the moving seat 105 slides on the surface of the two sets of limit slide bars 104, it is ensured that the moving seat 105 will not be tilted or deflected during the movement;

[0032] Rotating frames 106 are symmetrically fixedly installed at both ends of one side of the moving seat 105, and a top frame 107 is rotatably installed on the top of the rotating frame 106. A rotating frame 2 108 is rotatably installed on the end of the top frame 107 away from the rotating frame 106, and the rotating frame 2 108 is fixedly connected to the bottom of the flip mounting frame 9. Due to the provision of the top frame 107, when the moving seat 105 moves inside the base 1, the top frame 107 rotates between the rotating frame 106 and the rotating frame 2 108, thereby lifting one side of the flip mounting frame 9, so that the flip mounting frame 9 is tilted at a certain angle on the top of the base 1.

[0033] A flip mounting frame 9 is rotatably installed on the top of the base 1, and a mounting seat 10, a mounting seat 2 11 and a mounting seat 3 12 are fixedly installed on the bottom of the flip mounting frame 9. The structures of the mounting seat 10, the mounting seat 2 11 and the mounting seat 3 12 are the same, and the shapes of the mounting seat 10, the mounting seat 2 11 and the mounting seat 3 12 correspond to the forming mold 1 13, the forming mold 2 15 and the forming mold 3 17 respectively. Four groups of limiting slide grooves 1001 are provided at equal angles on the inner wall of the mounting seat 10, an electric push rod 1002 is fixedly installed at the bottom of the mounting seat 10, and a push rod seat 1003 is fixedly installed on the top of the electric push rod 1002. By providing the electric push rod 1002, the electric push rod 1002 is controlled to extend and retract to make the push rod seat 1003 move up and down inside the mounting seat 10, so as to eject the roughened blank 14 inside the forming mold 13 at the top of the mounting seat 10, and at the same time, the inside of the mounting seat 2 11 and the mounting seat 3 12 are synchronously extended and retracted to eject the forming blank 16 and the back-extruded blank 18 inside the forming mold 2 15 and the forming mold 3 17;

[0034] Four sets of limiting protrusions 1004 are fixedly installed at equal angles on the bottom of the surface of the push rod seat 1003, and the limiting protrusions 1004 correspond to the positions of the limiting slide grooves 1001. Due to the provision of the limiting protrusions 1004, when the push rod seat 1003 moves up and down inside the mounting seat 10, the limiting protrusions 1004 slide inside the corresponding limiting slide grooves 1001, ensuring that the push rod seat 1003 does not rotate when moving inside the mounting seat 10.

[0035] The top of the flip mounting frame 9 is located at the top of the mounting seat 10, the mounting seat 2 11 and the mounting seat 3 12, and the forming mold 13, the forming mold 2 15 and the forming mold 3 17 are fixedly installed respectively. The forming mold 13, the forming mold 2 15 and the forming mold 3 17 are respectively provided with a roughing blank 14, a forming blank 16 and a back-extrusion blank 18 inside. The top of the forming mold 13, the roughing blank 14 and the forming mold 3 17 are respectively provided with a roughing head 5, a forming punch 6 and a back-extrusion punch 8. The top of the roughing head 5, the forming punch 6 and the back-extrusion punch 8 is fixedly installed with a top plate 4. By providing the top plate 4, the top plate 4 is connected to the forging device. When the forging device is controlled to drive the top plate 4 to move up and down, the roughing head 5, the forming punch 6 and the back-extrusion punch 8 can move synchronously;

[0036] The bottom of both sides of the base 1 are symmetrically fixed with side panels 2, and two groups of telescopic slide rods 3 are respectively fixedly installed between the two sides of the bottom of the top plate 4 and the two groups of side panels 2. Because of the telescopic slide rods 3, when the top plate 4 is controlled to move up and down on the top of the flip mounting frame 9, it is ensured that the position between the top plate 4 and the base 1 will not be offset, so that the roughing punch 5, the forming punch 6 and the back extrusion punch 8 can correspond to the positions of the forming die 1 13, the forming die 2 15 and the forming die 3 17 without offset.

[0037] The roughing ram 5 corresponds to the top position of the roughing blank 14 and has the same shape. The roughing blank 14 has the same shape as the inner wall of the forming die 13. By providing the roughing ram 5, the heated rod is placed into the forming die 13, and the roughing ram 5 is controlled to press the rod into the forming die 13, so that the heated rod is forged into the roughing blank 14.

[0038] The surface of the top of the forming punch 6 is symmetrically provided with air holes 601, and an inner punch 7 is slidably installed on the bottom of the forming punch 6, and the gap between the forming punch 6 and the inner punch 7 is the same as the shape of the top of the forming blank 16. The forming blank 16 corresponds to the inner wall of the forming die 15. Because the forming punch 6 and the inner punch 7 are provided, after the rough blank 14 is placed in the inside of the forming die 15, the forming punch 6 and the inner punch 7 are controlled to be pressed into the inside of the forming die 15, so that the rough blank 14 is forged into the forming blank 16.

[0039] The bottom of the back-extrusion punch 8 corresponds to the top position of the back-extrusion blank 18 and has the same shape. The back-extrusion blank 18 corresponds to the inner wall of the forming die three 17. Because the back-extrusion punch 8 is provided, the forming blank 16 is placed into the forming die three 17, and the back-extrusion punch 8 is controlled to be pressed into the forming die three 17, so that the forming blank 16 is forged into the back-extrusion blank 18.

[0040] A forging method for a forming forging die of a stepped structure wheel hub shaft tube, the forging method comprising the following steps:

[0041] After the base 1 is installed in the forging device, the top plate 4 is fixedly connected to the forging working position of the forging device, the top plate 4 is controlled to move upward to drive the roughing punch 5, the forming punch 6 and the reverse extrusion punch 8 to move upward away from the flip mounting frame 9, and the rotating motor 103 is controlled to rotate to make the rotating screw 101 rotate synchronously, so that the moving seat 105 moves inside the base 1 toward the rotating motor 103, and the top frame 107 rotates between the rotating frame 1 106 and the rotating frame 2 108 to lift one side of the flip mounting frame 9 until the flip mounting frame 9 is tilted at a certain angle on the top of the base 1, and the heated The bar material, the roughing blank 14 and the forming blank 16 are respectively placed in the forming die 1 13, the forming die 2 15 and the forming die 3 17, and the rotating motor 103 is controlled to flip, so that the top frame 107 pulls the flip mounting frame 9 to rotate on the top of the base 1 until the flip mounting frame 9 is close to the top of the base 1, and the forging working position of the forging device is controlled to be pressed down, driving the top plate 4 to move down, so that the roughing punch 5, the forming punch 6 and the reverse extrusion punch 8 are pressed into the corresponding forming die 1 13, the forming die 2 15 and the forming die 3 17, and the heated bar material, the roughing blank 14 and the forming blank 16 are forged;

[0042] After the forging is completed, the forging working position of the forging device is controlled to move upward, driving the top plate 4 to move upward, so that the roughing punch 5, the forming punch 6 and the reverse extrusion punch 8 are pulled out from the corresponding forming die 13, the forming die 2 15 and the forming die 3 17, and the rotating motor 103 is controlled to rotate to drive the rotating screw 101 to rotate, and the top frame 107 is controlled to lift one side of the flip mounting frame 9, so that the top of the forming die 13, the forming die 2 15 and the forming die 3 17 are away from the roughing punch 5, At the bottom of the forming punch 6 and the back-extrusion punch 8, the electric push rod 1002 is controlled to extend to push the roughened blank 14 forged and formed inside the forming die 13 out of the forming die 13, and at the same time, the forming blank 16 and the back-extrusion blank 18 inside the forming die 2 15 and the forming die 3 17 are controlled to be pushed out, and the ejected roughened blank 14, forming blank 16 and back-extrusion blank 18 are replaced in position, and the steps are repeated until the bar material is forged into the back-extrusion blank 18 and taken out from the forming die 3 17.

[0043] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A forging die for a stepped hub axle tube, comprising a base (1), characterized in that: A flip mounting frame (9) is rotatably mounted on the top of the base (1); a mounting seat 1 (10), a mounting seat 2 (11) and a mounting seat 3 (12) are fixedly mounted on the bottom of the flip mounting frame (9); a forming die 1 (13), a forming die 2 (15) and a forming die 3 (17) are fixedly mounted on the top of the flip mounting frame (9) located on the top of the mounting seat 1 (10), the mounting seat 2 (11) and the mounting seat 3 (12); a roughing blank (14), a forming blank (16) and a reverse extrusion blank (18) are respectively arranged inside the forming die 1 (13), the forming blank (14) and the forming die 3 (17); a roughing press head (5), a forming punch (6) and a reverse extrusion punch (8) are respectively arranged on the top of the forming die 1 (13), the roughing blank (14) and the forming die 3 (17).

2. The forming forging die for a stepped hub shaft tube according to claim 1, characterized in that: A top plate (4) is fixedly mounted on the top of the roughening punch (5), the forming punch (6) and the reverse extrusion punch (8); side plates (2) are symmetrically fixedly mounted on the bottom of both sides of the base (1); and two groups of telescopic sliding rods (3) are respectively fixedly mounted between the two sides of the bottom of the top plate (4) and the two groups of side plates (2).

3. The forming forging die for a stepped hub shaft tube according to claim 1, characterized in that: A rotating screw (101) is rotatably mounted between the central positions of both sides of the inner wall of the base (1), and one end of the rotating screw (101) passes through the base (1) and is fixedly mounted with a bevel gear (102). A rotating motor (103) is fixedly mounted on one side of the base (1), and a bevel gear (102) is fixedly mounted on the output end of the rotating motor (103). The two sets of bevel gears (102) are meshed with each other. The inside of the base (1) is symmetrically fixedly mounted on both sides of the rotating screw (101). 104), a moving seat (105) is slidably installed on one side of the surface of the rotating screw rod (101) and the two groups of limiting slide bars (104), a rotating frame (106) is symmetrically fixedly installed at both ends of one side of the moving seat (105), a top frame (107) is rotatably installed on the top of the rotating frame (106), and a rotating frame (108) is rotatably installed on the end of the top frame (107) away from the rotating frame (106), and the rotating frame (108) is fixedly connected to the bottom of the flip mounting frame (9).

4. The forming forging die for a stepped hub shaft tube according to claim 1, characterized in that: Four groups of limiting slide grooves (1001) are arranged at equal angles on the inner wall of the mounting seat (10); an electric push rod (1002) is fixedly installed on the bottom of the mounting seat (10); a push rod seat (1003) is fixedly installed on the top of the electric push rod (1002); four groups of limiting protrusions (1004) are fixedly installed at equal angles on the bottom of the surface of the push rod seat (1003); and the limiting protrusions (1004) correspond to the positions of the limiting slide grooves (1001).

5. The forming forging die for a stepped hub shaft tube according to claim 1, characterized in that: The structures of the mounting seat 1 (10), the mounting seat 2 (11) and the mounting seat 3 (12) are the same, and the shapes of the mounting seat 1 (10), the mounting seat 2 (11) and the mounting seat 3 (12) respectively correspond to the forming mold 1 (13), the forming mold 2 (15) and the forming mold 3 (17).

6. The forming forging die for a stepped hub shaft tube according to claim 1, characterized in that: The roughing head (5) corresponds to the top position of the roughing blank (14) and has the same shape as the roughing blank (14), and the roughing blank (14) has the same shape as the inner wall of the forming die (13).

7. The forming forging die for a stepped hub shaft tube according to claim 1, characterized in that: The surface of the top of the forming punch (6) is symmetrically provided with air holes (601), and an inner punch (7) is slidably installed on the bottom of the forming punch (6), and the gap between the forming punch (6) and the inner punch (7) is the same shape as the top of the forming blank (16), and the forming blank (16) corresponds to the inner wall of the second forming mold (15).

8. The forming forging die for a stepped hub shaft tube according to claim 1, characterized in that: The bottom of the reverse extrusion punch (8) corresponds to the top of the reverse extrusion blank (18) and has the same shape, and the reverse extrusion blank (18) corresponds to the inner wall of the forming die three (17).

9. A forging method for a forming forging die of a stepped structure wheel hub shaft tube, according to the forming forging die of a stepped structure wheel hub shaft tube according to any one of claims 1 to 8, characterized in that: The forging method comprises the following steps: After the base (1) is installed in the forging device and the top plate (4) is fixedly connected to the forging working position of the forging device, the top plate (4) is controlled to move upward to drive the roughing punch (5), the forming punch (6) and the reverse extrusion punch (8) to move upward away from the flip mounting frame (9), and the rotating screw (101) is controlled to rotate when the rotating motor (103) rotates, so that the movable seat (105) moves in the direction of the rotating motor (103) inside the base (1), and the top frame (107) rotates between the rotating frame 1 (106) and the rotating frame 2 (108) to lift up one side of the flip mounting frame (9) until the flip mounting frame (9) is tilted at a certain angle on the top of the base (1), and the heated bar material is placed on the top of the base (1). , the roughing blank (14) and the forming blank (16) are respectively placed in the forming die one (13), the forming die two (15) and the forming die three (17), the rotating motor (103) is controlled to flip, so that the top frame (107) pulls the flip mounting frame (9) to rotate on the top of the base (1) until the flip mounting frame (9) is tightly attached to the top of the base (1), and the forging working position of the forging device is controlled to press down, driving the top plate (4) to move downward, so that the roughing punch (5), the forming punch (6) and the reverse extrusion punch (8) are pressed into the corresponding forming die one (13), the forming die two (15) and the forming die three (17), and the heated rod material, the roughing blank (14) and the forming blank (16) are forged; After the forging is completed, the forging working position of the forging device is controlled to move upward, driving the top plate (4) to move upward, so that the roughing punch (5), the forming punch (6) and the reverse extrusion punch (8) are pulled out from the corresponding forming die 1 (13), the forming die 2 (15) and the forming die 3 (17), and the rotating motor (103) is controlled to rotate to drive the rotating screw (101) to rotate, and the top frame (107) is controlled to lift up one side of the flip mounting frame (9), so that the top of the forming die 1 (13), the forming die 2 (15) and the forming die 3 (17) are away from the roughing punch (5), The bottom of the forming punch (6) and the back-extrusion punch (8) is controlled to extend the electric push rod (1002) to eject the forged rough blank (14) inside the forming die (13) out of the forming die (13), and at the same time, the forming blank (16) and the back-extrusion blank (18) inside the forming die (15) and the forming die (17) are controlled to be ejected, and the ejected rough blank (14), forming blank (16) and back-extrusion blank (18) are replaced in position, and the steps are repeated until the bar material is forged into the back-extrusion blank (18) and taken out from the inside of the forming die (17).

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