A kind of automobile limit plate hub and its metal forming die

Abstract

The present invention provides a kind of automobile limiting disk hub and its metal forming mold, belonging to the technical field of automobile accessories. It solves the problems of poor limiting of existing automobile disk hubs. The automobile limiting disk hub comprises a body, the upper outer wall of the body is circumferentially uniformly distributed with external teeth, the lower outer wall of the body is a cylindrical surface, the body has a circle of radially outwardly convex ring at the end of the upper outer wall, the outer wall of the convex ring has a circle of annular limiting grooves connected to the end face of the external teeth, the outer diameter of the convex ring is greater than the minor diameter of the external teeth and smaller than the major diameter of the external teeth. The metal forming mold of the automobile limiting disk hub comprises a punch, a die and an inner core, a cavity is provided in the die, the cavity comprises an extrusion cavity and a forming cavity, a circle of step grooves is provided at the top of the forming cavity, the inner diameter of the extrusion cavity is greater than the inner diameter of the step groove wall, and the extrusion cavity is transitioned to the top of the step groove wall through a circle of arc surface, and the forming cavity has circumferentially uniformly distributed external teeth. The present invention has the advantages of convenient manufacturing and good limiting effect.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile accessories and relates to an automobile limiting disc hub, in particular to an automobile limiting disc hub and a metal forming die thereof. Background Art

[0002] The automobile hub is an important part of the clutch driven disc assembly. Its structure and processing accuracy directly affect the overall performance of the clutch driven disc assembly.

[0003] The applicant originally applied for a hub core manufacturing process [application number: 201310589218.0; authorization announcement number: CN103586642B], which includes the following steps: A. Forging a blank: using a common forging process, heating the blank to 1050°C to 1150°C, forging the blank on a press to form a blank, the blank includes a cylindrical body, the outer side of the body has an annular convex body, using a common spheroidizing annealing process to heat treat the blank to improve the cutting performance of the blank, and using phosphating and saponification treatment after the heat treatment; B. Machining the blank : Turn the end face, outer circle and inner hole of the blank by ordinary turning method; C. Cold extrusion external tooth forming: Place the blank in a cold extrusion die, and use a press to cold extrude the annular convex body of the blank to form external teeth, so that the side of the annular convex body is extruded to form external teeth, and the blank is processed into a semi-finished product; D. Semi-finished product machining: Use ordinary turning method to turn the two ends of the semi-finished product so that the dimensions of the two ends of the workpiece meet the design requirements: E. Surface anti-rust treatment: By performing surface anti-rust treatment on the semi-finished product, the surface of the semi-finished product has better anti-rust performance.

[0004] The above-mentioned disc hub core manufacturing process forges an annular convex body from the blank, which is easy to form, has a high pass rate and is energy-saving. However, the finished disc hub core cannot be limited, is easy to move during operation, and has less than ideal working stability. Summary of the invention

[0005] The purpose of the present invention is to provide an automobile limiting disc hub with good limiting effect and good working stability in view of the above problems existing in the prior art.

[0006] The second object of the present invention is to provide a metal forming die used in the manufacturing process of the above-mentioned automobile limit disc hub.

[0007] The first purpose of the present invention can be achieved through the following technical solutions: a kind of automobile limit disk hub, including a cylindrical and axially through body, the upper outer wall of the body is circumferentially evenly distributed with external teeth, the lower outer wall of the body is a cylindrical surface, and the inner wall of the body is axially evenly distributed with internal splines, characterized in that the body has a circle of radially outward protruding convex ring at the end of the upper outer wall, the outer wall of the convex ring has a circle of annular limiting grooves connected to the end face of the external teeth, the outer diameter of the convex ring is larger than the minor diameter of the external teeth, and the outer diameter of the convex ring is smaller than the major diameter of the external teeth.

[0008] In the above-mentioned automobile limiting disc hub, the difference a between the outer diameter of the convex ring and the minor diameter of the external teeth is 0.3-0.6 mm.

[0009] The present invention also provides a metal forming mold for an automobile limit disk hub, comprising a punch and a die, wherein an inner core coaxially arranged and extending out of the lower end of the punch is passed through the punch, the inner core is cylindrical, and the diameter of the inner core is smaller than the diameter of the punch, and a cavity coaxially arranged with the punch is provided in the die, characterized in that the cavity comprises an extrusion cavity and a molding cavity, the extrusion cavity is located at the upper part of the molding cavity and the inner wall of the extrusion cavity is a smooth surface, a circle of step grooves is provided at the top of the molding cavity, the inner diameter of the extrusion cavity is larger than the inner diameter of the step groove wall and the extrusion cavity transitions to the top of the step groove wall through a circle of arc surfaces, the bottom of the step groove tilts downward and transitions to the inner wall of the molding cavity, the molding cavity has external tooth grooves uniformly distributed circumferentially, the lower end of each external tooth groove axially extends to the bottom surface of the die, the upper end of each external tooth groove axially extends to the lower end of the extrusion cavity, and the edges of the step groove, the arc surface and each external tooth groove are all rounded.

[0010] In the above-mentioned metal forming mold of the automobile limit disk hub, the lower inner wall of the forming cavity has a circle of annular grooves, the inner wall of the forming cavity transitions to the annular grooves through rounded corners, and the lower end of the annular grooves is connected to the bottom of the die.

[0011] In the above-mentioned metal forming mold of the automobile limiting disk hub, the angle between the groove bottom and the groove wall of the step groove is 120°-160°.

[0012] Compared with the prior art, the automobile limit disc hub has a good limiting effect. During operation, it will not be affected by external forces and cause axial displacement. The torque transmission is smooth and the working stability is good. The metal forming mold of the automobile limit disc hub can achieve composite cold extrusion through the setting of the extrusion cavity and the forming cavity, which saves a set of cold extrusion dies and also saves an annealing and saponification heat treatment process. There is no need for repositioning in the intermediate process, and the processing accuracy is good and the processing efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural diagram of the automobile limiting disc hub.

[0014] Figure 2It is a structural sectional view of the automobile limiting disc hub.

[0015] Figure 3 It is a three-dimensional structural diagram of a metal forming die of the automobile limit plate hub.

[0016] Figure 4 It is a structural sectional view of a metal forming die of the automobile limiting disc hub.

[0017] Figure 5 yes Figure 4 A magnified view of the structure of part A in the middle.

[0018] Figure 6 It is a three-dimensional structural diagram of the automobile limit disc hub blank at the extrusion cavity in the metal forming die.

[0019] Figure 7 It is a three-dimensional structural diagram of the automobile limit disc hub blank when it passes through the arc surface and the step groove wall but does not pass through the step groove bottom in the metal forming mold.

[0020] Figure 8 It is a three-dimensional structural diagram of the intermediate process of the automobile limit disc hub blank after passing through the arc surface and the step groove in the metal forming mold.

[0021] Fig. 9 It is a three-dimensional structural diagram of the final forming of the automobile limit disc hub blank after passing through the arc surface and the step groove in the metal forming mold.

[0022] In the figure, 1, body; 2, external teeth; 3, internal splines; 4, convex ring; 5, limiting groove; 6, punch; 7, die; 8, inner core; 9, extrusion cavity; 10, forming cavity; 11, step groove; 12, arc surface; 13, external tooth groove; 14, annular groove; 15, arc-shaped protrusion; 16, step surface; 17, cutting surface. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] Example 1

[0025] like Figure 1 and Figure 2 As shown, the automobile limit disc hub includes a main body 1 which is cylindrical and axially through, the upper outer wall of the main body 1 is circumferentially evenly distributed with external teeth 2, the lower outer wall of the main body 1 is a cylindrical surface, the inner wall of the main body 1 is axially evenly distributed with internal splines 3, the main body 1 has a circle of radially outwardly protruding convex ring 4 at the end of the upper outer wall, the outer wall of the convex ring 4 has a circle of annular limiting grooves 5 connected to the end faces of the external teeth 2, the outer diameter of the convex ring 4 is larger than the minor diameter of the external teeth 2, and the outer diameter of the convex ring 4 is smaller than the major diameter of the external teeth 2.

[0026] The minor diameter of the external teeth 2 in the automobile limit disk hub refers to the diameter of the circle formed by the bottom of each adjacent external tooth 2, and the major diameter of the external teeth 2 refers to the diameter of the circle formed by the top of each external tooth 2. The limit groove 5 is for the limit snap ring to be inserted, and the convex ring 4 plays an axial blocking role on the outer end face of the limit snap ring (if the outer diameter of the convex ring 4 is less than or equal to the minor diameter of the external teeth 2, it will not play an axial blocking role, and the limit snap ring will fall off from the limit groove 5), and the end face of each external tooth 2 plays an axial blocking role on the inner end face of the limit snap ring, thus realizing the axial limit of the automobile limit disk hub. During the working process, the automobile limit disk hub will not be affected by external forces and axially displaced, the torque transmission is stable, and the working stability is good. At the same time, the automobile limit disk hub provides support for other parts, making the structure more stable.

[0027] The difference a between the outer diameter of the convex ring 4 and the minor diameter of the outer teeth 2 is 0.3-0.6 mm. This can save materials and reduce manufacturing costs while ensuring the limiting effect. In this embodiment, the difference a between the outer diameter of the convex ring 4 and the outer diameter of the lower part of the body 1 is 0.5 mm.

[0028] Example 2

[0029] This embodiment discloses the metal forming die used in the manufacturing process of the automobile limit plate hub in embodiment 1, such as Figure 3 , Figure 4 , Figure 5 As shown, the metal forming mold of the automobile limit disk hub includes a punch 6 and a die 7. The punch 6 is provided with an inner core 8 which is coaxially arranged and extends out of the lower end of the punch 6. The inner core 8 is cylindrical. The diameter of the inner core 8 is smaller than the diameter of the punch 6. The die 7 is provided with a cavity coaxially arranged with the punch 6. The cavity includes an extrusion cavity 9 and a molding cavity 10. The extrusion cavity 9 is located at the upper part of the molding cavity 10 and the inner wall of the extrusion cavity 9 is a smooth surface. The top of the molding cavity 10 has a circle of step grooves 11. The extrusion cavity 9 is located at the upper part of the molding cavity 10 and the inner wall of the extrusion cavity 9 is a smooth surface. The top of the molding cavity 10 has a circle of step grooves 11. The inner diameter of the cavity 9 is larger than the inner diameter of the groove wall of the step groove 11 and the extrusion cavity 9 transitions to the top of the groove wall of the step groove 11 through a circle of arc surface 12. The groove bottom of the step groove 11 tilts downward to transition to the inner wall of the molding cavity 10. The molding cavity 10 has external tooth grooves 13 uniformly distributed circumferentially. The lower end of each external tooth groove 13 extends axially to the bottom surface of the die 7, and the upper end of each external tooth groove 13 extends axially to the lower end of the extrusion cavity 9. The edges of the step groove 11, the arc surface 12 and each external tooth groove 13 are all rounded.

[0030] The metal forming die of the automobile limit disk hub can realize compound cold extrusion by setting the extrusion cavity 9 and the forming cavity 10, thereby eliminating a set of cold extrusion dies and an annealing and saponification heat treatment process. No repositioning is required in the intermediate process, and the processing accuracy and efficiency are high.

[0031] When the mold of the automobile limit disk hub is in use, the punch 6 is driven to rise and fall by the upper die seat of the existing press, the die 7 is fixedly connected to the lower die seat and an ejector rod is passed through the lower die seat, and a cylindrical and axially through-going blank is placed in the extrusion cavity 9, the punch 6 descends, and the inner core 8 is inserted into the axial hole of the blank. The punch 6 extrude the blank so that the blank enters the molding cavity 10. Due to the support and positioning function of the inner core 8, the blank will not shake, and the processing accuracy is high.

[0032] To further elaborate, Figure 6 As shown, the blank is first placed in the extrusion cavity 9 of the die 7. The blank is not cold extruded and is still cylindrical as a whole. Figure 7 As shown, the punch 6 descends and presses down the top of the blank, and the lower end of the blank contacts the arc surface 12, which plays a guiding role. At the same time, the arc surface 12 performs the first extrusion on the lower end of the blank, and the lower end of the blank forms an arc-shaped protrusion 15 adapted to the arc surface 12. The step groove 11 is used for the blank to deform and fill, so that the outer wall of the lower end of the blank forms a step surface 16 (the outer diameter of the step surface 16 is the outer diameter of the convex ring 4) engaged with the arc-shaped protrusion 15, and the part of the outer wall of the lower end of the blank entering the outer tooth groove 13 forms the outer tooth 2; Figure 8 As shown, the punch 6 continues to descend and presses down the top of the blank, and the bottom of the step groove 11 and the inner wall of the forming cavity 10 play a second extrusion role, so that the outer wall of the lower end of the blank forms a cutting surface 17 engaged with the step surface 16, and the diameter of the cutting surface 17 is the minor diameter of the external tooth 2. The portion of the outer wall of the lower end of the blank that enters the external tooth groove 13 continues to form the external tooth 2; Fig. 9 As shown, after the punch 6 is lowered into place, the blank reaches the bottom of the die 7, and the arc surface 12 and the step groove 11 form an arc-shaped protrusion 15 and a step surface 16 near the top of the outer wall of the blank, and the outer tooth groove 13 forms the outer teeth 2; subsequently, the automobile limit disc hub is processed through the existing machining process.

[0033] The lower inner wall of the molding cavity 10 has a circle of annular grooves 14, and the inner wall of the molding cavity 10 transitions to the annular grooves 14 through rounded corners, and the lower end of the annular grooves 14 is connected to the bottom of the die 7. The provision of the annular grooves 14 reduces the contact area between the molding cavity 10 and the blank, reduces friction resistance, makes molding easy and accurate, and facilitates demolding.

[0034] The angle between the bottom and the wall of the step groove 11 is 120°-160°, which has good guiding performance, reduces wear and extends the service life of the mold. In this embodiment, the angle between the bottom and the wall of the step groove 11 is 140°.

[0035] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in the field. The specific embodiments described herein are merely examples of the spirit of the present invention. The technical personnel in the technical field to which the present invention belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A metal forming die for a limit plate hub of an automobile, the limit plate hub of the automobile comprising a body (1) which is cylindrical and axially through, the upper outer wall of the body (1) being circumferentially uniformly provided with external teeth (2), the lower outer wall of the body (1) being a cylindrical surface, the inner wall of the body (1) being axially uniformly provided with internal splines (3), the body (1) having a circle of radially outwardly protruding convex rings (4) at the end of the upper outer wall, the outer wall of the convex ring (4) having a circle of annular limit grooves (5) connected to the end faces of the external teeth (2), the outer diameter of the convex ring (4) being The outer diameter of the convex ring (4) is smaller than the major diameter of the outer teeth (2), and the difference a between the outer diameter of the convex ring (4) and the minor diameter of the outer teeth (2) is 0.3-0.6 mm. The metal forming mold of the automobile limit plate hub comprises a punch (6) and a die (7), the punch (6) is provided with an inner core (8) coaxially arranged and extending from the lower end of the punch (6), the inner core (8) is cylindrical, and the diameter of the inner core (8) is smaller than the diameter of the punch (6), and the die (7) is provided with a cavity coaxially arranged with the punch (6), characterized in that: The mold cavity comprises an extrusion cavity (9) and a molding cavity (10), wherein the extrusion cavity (9) is located at the upper part of the molding cavity (10) and the inner wall of the extrusion cavity (9) is a smooth surface, and a circle of step grooves (11) are provided at the top of the molding cavity (10), wherein the inner diameter of the extrusion cavity (9) is greater than the inner diameter of the groove wall of the step groove (11) and the extrusion cavity (9) transitions to the top of the groove wall of the step groove (11) through a circle of arc surface (12), and the groove bottom of the step groove (11) transitions downwardly in an inclined manner to the inner wall of the molding cavity (10), and the molding cavity (10) has circumferentially uniformly distributed external tooth grooves (13), wherein the lower end of each external tooth groove (13) axially extends to the bottom surface of the die (7), and the upper end of each external tooth groove (13) axially extends to the lower end of the extrusion cavity (9), and the edges of the step groove (11), the arc surface (12) and each external tooth groove (13) are all rounded transitions.

2. The metal forming die of the automobile limit plate hub according to claim 1, characterized in that: The lower inner wall of the molding cavity (10) has a circle of annular grooves (14), the inner wall of the molding cavity (10) transitions to the annular grooves (14) through a rounded corner, and the lower end of the annular grooves (14) is connected to the bottom of the die (7).

3. The metal forming die of the automobile limit plate hub according to claim 2, characterized in that: The angle between the groove bottom and the groove wall of the step groove (11) is 120°-160°.

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