Caliber Rim Spinning Die and Method

Abstract

The present invention relates to a spinning die and method for a carburized wheel rim, including a support die and a profiling chuck. A top ejection mechanism is provided inside the support die. The lower end surface of the profiling chuck forms a first profiling surface, and the upper end surface of the support die forms a second profiling surface. The upper end surface of the top ejection mechanism can be lifted upward away from the support die. S1: The pressing chuck moves upward, separates from the support die and forms a space; S2: Place the carburized wheel hub on the top of the support die; S3: The top ejection structure jacks up the carburized wheel hub, and at the same time the pressing chuck continues to move downward; S4: The pressing chuck presses down the jacked-up carburized wheel hub together with the top ejection structure until the carburized wheel hub is pressed tightly on the support die; S5: The pressing chuck drives the pressing chuck, the carburized wheel hub and the support die to rotate together at a set speed. The present invention has the characteristics of avoiding insufficient rim perpendicularity of the hub blank after spinning, ensuring high-precision positioning of the hub blank, and at the same time avoiding deformation of the machining positioning ring of the hub blank.

Description

Technical Field

[0001] The present invention relates to a spinning die and method for a Kaba wheel rim, belonging to the technical field of hub spinning dies. Background Art

[0002] The integral truck aluminum alloy wheel hub is a typical ring-disc-shaped part, mainly composed of two major parts: the mounting disc spoke plate and the annular rim. Currently, tubeless tires are installed on all truck aluminum alloy wheels, which requires good airtightness and structural stiffness in the rim part of the aluminum alloy wheel. The spinning deformation of the annular rim is achieved by the cooperation and positioning of the inner wall of the spun blank of the truck wheel rim with the upper end of the spinning support die, and the spinning die pressing plate presses the end face of the machined positioning circle of the spun blank of the truck wheel. The main shaft of the spinning machine drives the spinning support die, the spun blank of the truck wheel, and the spinning die pressing plate to rotate together. The rough spinning wheel and the finish spinning wheel extrude and stretch the spun blank of the truck wheel rim from both sides to form the truck annular rim part.

[0003] The spun Kaba wheel blank is then machined to remove the excess allowance to produce the finished truck wheel hub. During the machining of the rim, the blank is positioned and clamped to the fixture of the machine tool through the machined positioning circle on the spun blank of the truck wheel. The clamping and positioning accuracy and perpendicularity of the blank on the machine tool fixture directly affect the machining accuracy and quality of the truck wheel hub.

[0004] Currently, there are generally problems in the spinning of the rim of the wheel hub blank, such as insufficient positioning accuracy when the spun blank of the wheel hub is clamped to the spinning support die, bending of the main shaft of the spinning machine during the extrusion and stretching process of the spun blank by the spinning wheel, and insufficient perpendicularity of the spun blank rim after spinning. Summary of the Invention

[0005] The purpose of the present invention is to provide a spinning die and method for a Kaba wheel rim, which solves the problems existing in the prior art, such as easy compression deformation and end face warping of the positioning circle of the Kaba wheel.

[0006] The above technical object of the present invention is mainly solved by the following technical solutions: A spinning die for a carburizing wheel rim includes a support die and a profiling platen disposed above the support die and axially movable up and down. An ejection mechanism coaxially arranged with the support die and capable of jacking up the hub of the carburizing wheel is provided inside the support die. The lower end surface of the profiling platen forms a first profiling surface conforming to the outer end surface of the spoke plate of the hub blank mounting disc, and the upper end surface of the support die forms a second profiling surface conforming to the inner end surface of the spoke plate of the hub blank mounting disc. The upper end surface of the ejection mechanism can cooperate with the inner end surface of the spoke plate of the hub blank to jack up the hub blank away from the support die. The above ejection mechanism can jack up the hub blank before the profiling platen compresses the hub blank to cooperate with the first profiling surface of the profiling platen, so that the first profiling surface limits and guides the hub blank, ensuring the coaxiality of the hub blank and the profiling platen, thereby strengthening the positioning accuracy of the hub blank, and then avoiding the problems of bending of the main shaft of the spinning machine and insufficient rim perpendicularity of the hub blank after spinning during the spinning process.

[0007] Preferably, a conical surface cooperating with the machining positioning ring of the hub blank is provided around the lower end of the profiling platen. The end surface of the machining positioning ring of the hub blank is pressed by the end surface of the profiling disc. During the spinning process, when it is radially extruded and axially stretched by the spinning wheel, it is easy to cause the pressing ring of the machining positioning ring to become elliptical and the end surface to warp, greatly affecting the positioning accuracy of subsequent machining. The setting of the conical surface can increase the limiting support for the machining positioning ring of the hub blank, thereby avoiding the pressing ring of the machining positioning ring from becoming elliptical and the end surface from warping.

[0008] Preferably, the first profiling surface and the conical surface are connected by an annular surface, and the annular surface does not contact the outer end surface of the spoke plate of the hub blank mounting disc. The setting of the annular surface can prevent the first profiling surface from being too closely connected to the outer end surface of the spoke plate of the hub blank, resulting in the hub blank being stuck at the lower end of the profiling platen and unable to be removed.

[0009] Preferably, a machining positioning ring pressing ring that can move axially is coaxially sleeved on the outer wall of the profiling platen. The machining positioning ring pressing ring can axially move within a certain range on the profiling platen. The lower end surface of the machining positioning ring pressing ring is used to cooperate with the machining positioning ring of the hub blank frame. The above machining positioning ring pressing ring can press the machining positioning ring of the hub blank. The profiling platen and the machining positioning ring pressing ring cooperate with each other to press the hub blank for spinning processing. The machining positioning ring pressing ring can move axially up and down to elastically press the machining positioning ring of the hub blank, so as to reduce the pressure on the end surface of the machining positioning ring of the hub blank, and can maintain the pressing of the end surface of the machining positioning ring of the hub blank, while avoiding the deformation of the machining positioning ring of the hub blank during the spinning process and affecting the machining positioning accuracy.

[0010] Preferably, an annular guiding groove is provided on the outer wall of the conformal pressing plate, and an annular guiding portion cooperating with the annular guiding groove is formed on the inner side of the upper end of the machining positioning ring pressing ring. The height of the annular guiding portion is less than that of the annular guiding groove. The machining positioning ring pressing ring can be limited in the annular guiding groove through the annular guiding portion, forming a limiting support of the conformal pressing plate for the machining positioning ring pressing ring, so that the machining positioning ring pressing ring can stably move axially up and down in the annular guiding groove.

[0011] Preferably, the conformal pressing plate is fixed below the connecting plate, and the annular guiding groove is jointly formed by the connecting plate and the conformal pressing plate. A compression spring is provided between the lower end surface of the connecting plate and the upper end surface of the machining positioning ring pressing ring. The machining positioning ring pressing ring can be limited in the annular guiding groove through the cooperation of the connecting plate and the annular guiding groove to prevent the machining positioning ring pressing ring from loosening. The compression spring can extrude the machining positioning ring pressing ring, so that the machining positioning ring pressing ring can elastically extrude the machining positioning ring of the hub blank, reduce the acting force on the machining positioning ring of the hub blank, prevent the machining positioning ring of the hub blank from warping due to force, and at the same time play a buffering role during vibration, reducing the impact force on the machining positioning ring of the hub blank.

[0012] Preferably, the first conformal surface includes a conical surface section and an arc surface section. The conical surface section is used to cooperate with the inclined surface part of the mounting disc web of the hub blank, and the arc surface section is used to cooperate with the connection part of the inclined surface part and the flat surface part of the mounting disc web of the hub blank. The above settings of the conical surface section and the arc surface section enable the first conformal surface to be in high-precision cooperation with the outer end surface of the mounting disc web of the hub blank, strengthen the positioning effect on the hub blank, ensure the precise cooperation of the hub blank with the first conformal surface, and prevent the hub blank from having a radial misalignment.

[0013] The present invention also provides a method for spinning the rim of a carburized wheel, including the following steps:

[0014] S1. The spinning machine drives the conformal pressing plate to open upward to a position convenient for placing the hub blank.

[0015] S2. The manipulator grips the hub blank and places it on the support mold.

[0016] S3. The spinning machine drives the conformal pressing plate to close downward until the first conformal surface is at a certain distance from the outer end surface of the mounting disc web of the hub blank.

[0017] S4. The ejecting mechanism ejects upward to drive the hub blank upward so that the outer end surface of the mounting disc web of the hub blank fits and presses against the first conformal surface of the conformal pressing plate.

[0018] S5. The conformal pressing plate, the hub blank and the ejecting mechanism move downward together so that the inner wall of the mounting web of the hub blank fits and presses against the second conformal surface of the support mold.

[0019] S6. The spinning machine drives the supporting die, the hub blank, and the profiling platen to rotate together at a set speed; the rough spinning wheel and the fine spinning wheel respectively extrude and stretch the rim part of the hub blank along the rough spinning wheel track line and the fine spinning wheel track line to complete the spinning forming of the rim part of the hub blank.

[0020] The above method makes the hub blank and the inner wall of the mounting disc web of the hub blank fit and press tightly against the supporting die to achieve the second calibration and positioning, so that the spinning positioning reference of the hub blank rim is unified with the subsequent machining reference; it greatly improves the spinning and machining positioning accuracy and perpendicularity of the hub blank rim, thereby improving the spinning uniformity and machining accuracy of the hub blank rim, and then improving the quality of the hub finished product.

[0021] Preferably, in the S1 step, the distance that the profiling platen moves upward is B, the value of B is A + 30 - 50 mm, and A is the height of the hub blank; in the S3 step, the distance between the profiling platen and the outer end face of the mounting disc web of the hub blank is C, and the value of C is equal to the distance that the ejecting mechanism ejects upward in the S4 step.

[0022] Preferably, the value of C is 15 - 25 mm.

[0023] Therefore, the present invention has the characteristics of avoiding insufficient perpendicularity of the hub blank rim after spinning, ensuring high-precision positioning of the hub blank, being able to maintain the extrusion of the end face of the machining positioning circle of the hub blank, and at the same time avoiding deformation of the machining positioning circle of the hub blank during the spinning process, which affects the machining positioning accuracy. Brief Description of the Drawings

[0024] Figure 1 It is the overall structural state diagram after the profiling platen in the present invention is opened upward to place the hub blank.

[0025] Figure 2 It is Figure 1 The enlarged structural diagram of the A position in

[0026] Figure 3 It is the structural state diagram when the profiling platen in the present invention is closed downward to a certain distance.

[0027] Figure 4 It is the structural state diagram when the ejecting mechanism in the present invention ejects the hub blank upward away from the supporting die.

[0028] Figure 5 It is the structural state diagram when the supporting die, the hub blank, and the profiling platen are pressed tightly against each other in the present invention. Detailed Embodiment

[0029] The technical solution of the present invention will be further specifically described below through embodiments and in conjunction with the drawings.

[0030] As shown Figure 1-2 in the figure, a spinning die for the rim of a Kabal wheel includes a support die 4 and a profiling pressure plate 1 disposed above the support die and axially movable up and down. An ejection mechanism 41 coaxial with the support die 4 and capable of jacking up the hub of the Kabal wheel upward is provided inside the support die 4. The lower end face of the profiling pressure plate 1 forms a first profiling surface 11 that conforms to the outer end face of the spoke plate of the hub blank mounting plate. The upper end face of the support die 4 forms a second profiling surface 42 that conforms to the inner end face of the spoke plate of the hub blank mounting plate. The upper end face of the ejection mechanism 41 can cooperate with the inner end face of the spoke plate of the hub blank mounting plate to jack up the hub blank upward away from the support die 4; the first profiling surface 11 includes a conical surface section 111 and an arc surface section 112. The conical surface section 111 is used to cooperate with the inclined part of the spoke plate of the hub blank mounting plate, and the arc surface section 112 is used to cooperate with the connection part between the inclined part and the flat part of the spoke plate of the hub blank mounting plate. A conical surface 12 that cooperates with the machined positioning circle of the hub blank is provided around the lower end of the profiling pressure plate 1. The first profiling surface 11 and the conical surface 12 are connected by an annular surface 13, and the annular surface 13 does not contact the outer end face of the spoke plate of the hub blank mounting plate.

[0031] The above-mentioned connecting plate and profiling pressure plate are connected to the main shaft of the spinning machine. The profiling pressure plate is connected to the connecting plate by bolts. Through the profiling cooperation between the profiling pressure plate and the outer end face of the spoke plate of the hub blank and making the profiling pressure plate and the hub blank be tightly conically matched with the support die together, the main shaft of the spinning machine and the rotation axis of the profiling pressure plate are combined into a whole, and the spinning main shaft can better resist the axial extrusion force during the spinning of the spinning wheel, making the wall thickness of the rim of the spun hub blank more uniform; the above-mentioned ejection mechanism can move up and down to support the spoke plate of the hub blank. The ejection mechanism can adopt a structure controlled by a cylinder for lifting and lowering, or a structure controlled by a lead screw for lifting and lowering to realize the stable ejection of the hub blank.

[0032] The above-mentioned ejection structure jacks up the spoke plate of the hub blank mounting plate upward, making the outer end face of the spoke plate of the hub blank mounting plate closely abut against the first profiling surface of the profiling pressure plate, and enabling the spoke plate of the hub blank mounting plate to adjust its own position during the close cooperation process to achieve coaxiality with the profiling pressure plate. The profiling pressure plate keeps pressing the spoke plate of the hub blank mounting plate while pressing down the spoke plate of the hub blank mounting plate and the ejection mechanism through the ejection mechanism, making the inner end face of the spoke plate of the hub blank mounting plate closely abut against the second profiling surface of the support die. The close cooperation between the inner end face of the spoke plate of the hub blank mounting plate and the second profiling surface realizes the secondary positioning of the spoke plate of the hub blank mounting plate, making the position of the hub blank more accurate, and through the cooperation of the first profiling surface and the second profiling surface with the outer end face and the inner end face of the spoke plate of the hub blank mounting plate respectively, the mutual pressing of the profiling pressure plate, the spoke plate of the hub blank mounting plate and the ejection mechanism is realized.

[0033] As Figure 1-2As shown in the figure, a machining positioning ring pressing ring 3 that can move axially is coaxially sleeved on the outer wall of the profiling pressure plate 1. The machining positioning ring pressing ring 3 can axially move within a certain range on the profiling pressure plate 1. The lower end face of the machining positioning ring pressing ring 3 is used to cooperate with the machining positioning ring of the hub blank. An annular guide groove 14 is provided on the outer wall of the profiling pressure plate 1. An annular guide portion 15 that cooperates with the annular guide groove 14 is formed on the inner side of the upper end of the machining positioning ring pressing ring 3. The height of the annular guide portion 15 is less than the height of the annular guide groove 14. The profiling pressure plate 1 is fixed below the connecting plate 2. The annular guide groove 14 is jointly formed by the connecting plate 2 and the profiling pressure plate 1. A compression spring 31 is provided between the lower end face of the connecting plate 2 and the upper end face of the machining positioning ring pressing ring 3.

[0034] The above-mentioned machining positioning ring pressing ring is fixed in the annular guide groove. The upper end of the compression spring abuts against the bottom surface of the connecting plate, and the lower end of the compression spring abuts against the top surface of the annular guide portion of the machining positioning ring pressing ring. The compression spring acts on the annular guide portion with a downward force, so that the annular guide portion is pressed against the end face of the machining positioning ring of the hub blank. When the machining positioning ring pressing ring is subjected to vibration generated during processing, it can float up and down through the compression spring, playing a buffering role for the machining positioning ring pressing ring, and the machining positioning ring pressing ring always maintains the pressing on the machining positioning ring of the hub blank. A gap of 3 mm is formed between the bottom surface of the connecting plate and the top surface of the annular guide portion, ensuring the stable extrusion of the machining positioning ring pressing ring on the machining positioning ring of the hub blank through the compression spring, and avoiding excessive jumping amplitude of the machining positioning ring pressing ring.

[0035] As Figure 1-5 shown, a method for spinning the rim of a Kabal wheel includes the following steps:

[0036] S1. The spinning machine drives the profiling pressure plate to move upward by 310 mm. The axial height of the hub blank is 270 mm, so that the profiling pressure plate is opened to a position convenient for placing the hub blank.

[0037] S2. The manipulator grips the hub blank and places it on the support mold.

[0038] S3. The spinning machine drives the profiling pressure plate to close downward until the first profiling surface is 20 mm away from the outer end face of the mounting disc web of the hub blank.

[0039] S4. The ejecting mechanism ejects upward by 20 mm. The ejecting mechanism drives the hub blank upward so that the outer end face of the mounting disc web of the hub blank fits and presses against the first profiling surface of the profiling pressure plate.

[0040] S5. The profiling pressure plate, the hub blank and the ejecting mechanism move downward together so that the inner wall of the mounting web of the hub blank fits and presses against the second profiling surface of the support mold.

[0041] S6. The spinning machine drives the support die, the hub blank, and the profiling chuck to rotate at a set speed; the rough spinning wheel and the fine spinning wheel respectively extrude and stretch the rim part of the hub blank along the rough spinning wheel track line and the fine spinning wheel track line to complete the spinning forming of the rim part of the hub blank.

[0042] The external spinning machine drives the profiling chuck to move upward, thus forming a larger space between the profiling chuck and the support die, which can be used for the external manipulator to grip the Kaba wheel hub blank and place it on the support die. Subsequently, the spinning machine drives the profiling chuck to move downward to a specified height position above the hub blank and then stops moving. At this time, the ejection mechanism jacks up the Kaba wheel hub blank, making the outer end face of the mounting disc web of the Kaba wheel hub blank fit and press tightly against the first profiling surface of the profiling chuck. After that, the profiling chuck continues to press down and drives the Kaba wheel hub blank and the ejection mechanism to move downward together until the inner end face of the mounting disc web of the Kaba wheel hub blank fits and presses tightly against the second profiling surface at the upper end of the support die, thereby realizing the unity of the spinning positioning reference and the subsequent machining reference of the Kaba wheel hub blank, greatly improving the positioning accuracy and perpendicularity of the Kaba wheel hub spinning and machining, and improving the spinning uniformity and machining accuracy of the Kaba wheel, and improving the quality of the Kaba wheel finished product; after the profiling chuck, the hub blank, and the support die are pressed tightly against each other, the spinning machine drives the support die, the profiling chuck, and the hub blank to rotate at a set speed; the rough spinning wheel and the fine spinning wheel respectively extrude and stretch the Kaba wheel hub along the rough spinning wheel track line and the fine spinning wheel track line, thereby completing the spinning forming of the rim part of the hub blank.

Claims

1. A method for a spinning die of a carburized wheel rim, characterized in that, The mold includes a support mold (4) and a profiling chuck (1) disposed above the support mold and axially movable up and down. An ejection mechanism (41) coaxial with the support mold (4) and capable of jacking up the hub of the Kaba wheel is provided in the support mold (4). The lower end face of the profiling chuck (1) forms a first profiling surface (11) conforming to the outer end face of the spoke plate of the hub blank mounting plate, and the upper end face of the support mold (4) forms a second profiling surface (42) conforming to the inner end face of the spoke plate of the hub blank mounting plate. The upper end face of the ejection mechanism (41) can cooperate with the inner end face of the spoke plate of the hub blank to jack up the hub blank away from the support mold (4), including the following steps: S1. The spinning machine drives the profiling chuck to move upward to a position convenient for placing the hub blank; S2. The manipulator grips the hub blank and places it on the support mold; S3. The spinning machine drives the profiling chuck to move downward to close the mold until the first profiling surface is at a certain distance from the outer end face of the spoke plate of the hub blank; S4. The ejection mechanism jacks up upward to drive the hub blank upward so that the outer end face of the spoke plate of the hub blank fits and presses against the first profiling surface of the profiling chuck; S5. The profiling chuck, the hub blank and the ejection mechanism move downward together so that the inner wall of the mounting spoke of the hub blank fits and presses against the second profiling surface of the support mold; S6. The spinning machine drives the support mold, the hub blank and the profiling chuck to rotate together at a set speed; the rough spinning wheel and the fine spinning wheel respectively extrude and stretch the rim part of the hub blank along the rough spinning wheel track line and the fine spinning wheel track line to complete the spinning forming of the rim part of the hub blank.

2. The method according to claim 1, characterized in that: In the step S1, the distance that the profiling chuck moves upward is B, the value of B is A + 30 to A + 50 mm, A is the height of the hub blank, the distance between the profiling chuck and the outer end face of the spoke plate of the hub blank in the step S3 is C, and the value of C is equal to the distance that the ejection mechanism jacks up upward in the step S4.

3. The method according to claim 2, characterized in that: The value of C is 15 - 25 mm.

4. The method according to claim 1, characterized in that: The lower periphery of the profiling chuck (1) is provided with a conical surface (12) matching the machining positioning ring of the hub blank.

5. The method according to claim 4, characterized in that: The first profiling surface (11) is connected to the conical surface (12) through an annular surface (13), and the annular surface (13) does not contact the outer end face of the spoke plate of the hub blank mounting plate.

6. The method according to claim 4 or 5, characterized in that: An axially movable machining positioning ring pressing ring (3) is coaxially sleeved on the outer wall of the profiling chuck (1). The machining positioning ring pressing ring (3) can axially move within a certain range on the profiling chuck (1), and the lower end face of the machining positioning ring pressing ring (3) is used to cooperate with the machining positioning ring of the hub blank.

7. The method according to claim 6, characterized in that: An annular guide groove (14) is provided on the outer wall of the profiling chuck (1). An annular guide portion (15) matching the annular guide groove (14) is formed on the inner side of the upper end of the machining positioning ring pressing ring (3), and the height of the annular guide portion (15) is less than the height of the annular guide groove (14).

8. The method according to claim 7, characterized in that: The conformal pressure plate (1) is fixed below the connecting plate (2), the annular guide groove (14) is jointly formed by the connecting plate (2) and the conformal pressure plate (1), and a compression spring (31) is provided between the lower end surface of the connecting plate (2) and the upper end surface of the machining positioning ring pressing ring (3).

9. The method according to claim 4 or 5, characterized in that: The first conformal surface (11) includes a conical surface section (111) and an arc surface section (112). The conical surface section (111) is used to cooperate with the inclined surface part of the hub blank mounting disc web, and the arc surface section (112) is used to cooperate with the connection part between the inclined surface part and the flat surface part of the hub blank mounting disc web.

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