CN115351214A - Automobile limiting hub and metal forming die thereof - Google Patents

Abstract

The invention provides an automobile limiting hub and a metal forming die thereof, and belongs to the technical field of automobile accessories. It has solved the spacing not good scheduling problem of current car dish hub. This spacing dish hub of car includes the body, and the upper portion outer wall circumference equipartition of body has the external tooth, and the lower part outer wall of body is the face of cylinder, and the body has the bulge loop of the radial evagination of round in the tip department of upper portion outer wall, and the outer wall of bulge loop has the round and is the annular and meet in the spacing groove of external tooth terminal surface, and the external diameter of bulge loop is greater than the path of external tooth and is less than the big footpath of external tooth. This metal forming die of spacing dish hub of car includes terrace die, die and inner core, is equipped with the die cavity in the die, and the die cavity is including extrusion chamber and shaping chamber, and the top department of shaping chamber has a round step groove, and the internal diameter of extrusion chamber is greater than the internal diameter of step groove cell wall and the extrusion chamber passes through the top of round cambered surface transition to step groove cell wall, and shaping chamber has the outer tooth groove of circumference equipartition. The invention has the advantages of convenient manufacture, good limiting effect and the like.

Description

Automobile limiting hub and metal forming die thereof

Technical Field

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

Background

The automobile hub is an important accessory in the clutch driven disc assembly, and the structure and the machining precision of the automobile hub directly influence the overall performance of the clutch driven disc assembly.

The applicant previously filed for a hub core manufacturing process [ application No.: 201310589218.0; authorization notice number: CN103586642B ], which comprises the following steps: A. forging a blank: heating the blank to 1050-1150 ℃ by adopting a common forging process, forging the blank on a press to form a blank, wherein the blank comprises a cylindrical body, the outer side of the body is provided with an annular convex body, carrying out heat treatment on the blank by adopting a common spheroidizing annealing process to improve the cutting performance of the blank, and carrying out phosphorization and saponification treatment after the heat treatment; B. machining a blank: turning the end face, the excircle and the inner hole of the blank by a common turning method; C. and (3) cold extrusion external tooth forming: placing the blank in a cold extrusion die, carrying out cold extrusion molding processing on the annular convex body of the blank by a press machine to form external teeth, extruding the side part of the annular convex body to form the external teeth, and processing the blank to form a semi-finished product; D. machining a semi-finished product: turning the two ends of the semi-finished product by a common turning method to ensure that the sizes of the two ends of the workpiece meet the design requirements: E. surface rust prevention treatment: the semi-finished product is subjected to surface rust prevention treatment, so that the surface of the semi-finished product has better rust prevention performance.

The manufacturing process of the hub core forges the blank into the annular convex body, is easy to form, high in qualification rate and energy-saving, but the finished hub core cannot be limited, is easy to displace during working, and is not ideal in working stability.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an automobile limiting disc hub with good limiting effect and good working stability.

The second object of the present invention is: the metal forming die is used in the manufacturing process of the automobile limiting hub.

The first object of the present invention can be achieved by the following technical solutions: the utility model provides a spacing dish hub of car, is including being cylindric and the axially body that link up, the upper portion outer wall circumference equipartition of body have the external tooth, the lower part outer wall of body is the face of cylinder, the inner wall axial equipartition of body has the internal spline, its characterized in that, the body tip department of upper portion outer wall have the bulge loop of the radial evagination of round, the outer wall of bulge loop have the round and be the annular and meet in the spacing groove of external tooth terminal surface, the external diameter of bulge loop is greater than the path of external tooth, the external diameter of bulge loop is less than the big footpath of external tooth.

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

The invention also provides a metal forming die of the automobile limiting disc hub, which comprises a male die and a female die, wherein an inner core which is coaxially arranged and extends out of the lower end of the male die is arranged in the male die in a penetrating manner, the inner core is cylindrical, the diameter of the inner core is smaller than that of the male die, and a die cavity which is coaxially arranged with the male die is arranged in the female die.

In the metal forming die for the automobile limiting hub, the inner wall of the lower part of the forming cavity is provided with a circle of annular groove, the inner wall of the forming cavity is transited to the annular groove through a round angle, and the lower end of the annular groove is communicated to the bottom of the female die.

In the metal forming die for the automobile limiting disc hub, the angle between the bottom of the stepped groove and the groove wall is 120-160 degrees.

Compared with the prior art, the automobile limiting hub has the advantages that the limiting effect is good, the axial displacement caused by the influence of external force can be avoided in the working process, the torque transmission is stable, and the working stability is good; this metal forming die of spacing dish hub of car can realize compound cold extrusion through the setting of extrusion chamber and shaping chamber, has saved one set of cold extrusion die like this, has also saved the heat treatment process of once annealing, saponification, and the intermediate process need not the relocation, and the machining precision is good, and machining efficiency is high.

Drawings

Fig. 1 is a perspective structure view of the automobile limiting hub.

Fig. 2 is a structural sectional view of the automobile limiting hub.

Fig. 3 is a perspective view of the metal forming die for the automobile limiting hub.

Fig. 4 is a structural sectional view of the metal forming die for the automobile limiting hub.

Fig. 5 is an enlarged view of a portion a in fig. 4.

Fig. 6 is a three-dimensional structure view of the automobile limiting hub blank in an extrusion cavity of a metal forming die.

Fig. 7 is a three-dimensional structure diagram of the automobile limiting hub blank passing through the arc surface and the groove wall of the step groove but not passing through the bottom of the step groove in the metal forming die.

Fig. 8 is a three-dimensional structure diagram of the automobile limiting hub blank in the middle process after passing through the arc surface and the step groove in the metal forming die.

Fig. 9 is a three-dimensional structure diagram of the final forming of the automobile limiting hub blank after passing through the arc surface and the step groove in the metal forming die.

In the figure, 1, a body; 2. an outer tooth; 3. an internal spline; 4. a convex ring; 5. a limiting groove; 6. a male die; 7. a female die; 8. an inner core; 9. an extrusion chamber; 10. a molding cavity; 11. a step groove; 12. a cambered surface; 13. an outer gullet; 14. an annular groove; 15. an arc-shaped bulge; 16. a step surface; 17. and (5) cutting the surface.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example 1

As shown in fig. 1 and fig. 2, this spacing dish hub of car is including being cylindric and the body 1 that axially link up, the upper portion outer wall circumference equipartition of body 1 has external tooth 2, the lower part outer wall of body 1 is the face of cylinder, the inner wall axial equipartition of body 1 has internal spline 3, body 1 has the radial evagination bulge loop 4 of round in the tip department of upper portion outer wall, the outer wall of bulge loop 4 has the round and is the annular and meet in the spacing groove 5 of 2 terminal surfaces of external tooth, the external diameter of bulge loop 4 is greater than the path of external tooth 2, the external diameter of bulge loop 4 is less than the big path of external tooth 2.

The path of outer tooth 2 among this spacing dish hub of car refers to the diameter of the circle that encloses in the tooth bottom between each adjacent outer tooth 2, and the major diameter of outer tooth 2 refers to the diameter of the circle that encloses in the tooth top of each outer tooth 2. Spacing groove 5 supplies spacing snap ring card to go into, the bulge loop 4 plays the axial and stops the effect to the outer terminal surface of spacing snap ring (if the external diameter of bulge loop 4 is less than or equal to 2 path of external tooth, just can not play the axial and stops the effect, spacing snap ring can drop from spacing groove 5), the terminal surface of each external tooth 2 plays the axial and stops the effect to the terminal surface in the spacing snap ring, it is spacing to have realized the axial of this spacing dish hub of car like this, in the course of the work, this spacing dish hub of car can not receive external force influence and axial displacement, the moment transmission is steady, good working stability, this spacing dish hub of car provides the support for other parts simultaneously, make the structure more firm.

The difference a between the outer diameter of the male ring 4 and the small diameter of the external teeth 2 is 0.3-0.6mm. Therefore, the limiting effect is guaranteed, meanwhile, materials can be saved, the manufacturing cost is reduced, and the difference a between the outer diameter of the convex ring 4 and the outer diameter of the lower portion of the body 1 is 0.5mm.

Example 2

The embodiment discloses a metal forming die adopted by an automobile limiting hub in embodiment 1 in the manufacturing process, as shown in fig. 3, fig. 4 and fig. 5, the metal forming die of the automobile limiting hub comprises a male die 6 and a female die 7, an inner core 8 coaxially arranged and extending out of the lower end of the male die 6 penetrates through the male die 6, the inner core 8 is cylindrical, the diameter of the inner core 8 is smaller than that of the male die 6, a cavity coaxially arranged with the male die 6 is arranged in the female die 7 and comprises an extrusion cavity 9 and a forming cavity 10, the extrusion cavity 9 is positioned at the upper part of the forming cavity 10, the inner wall of the extrusion cavity 9 is a smooth surface, a circle of step groove 11 is arranged at the top of the forming cavity 10, the inner diameter of the extrusion cavity 9 is larger than that of the groove wall of the step groove 11, the extrusion cavity 9 is transited to the top end of the groove wall of the step groove 11 through a circle of arc surface 12, the groove bottom of the step groove 11 is transited to the inner wall of the forming cavity 10, the forming cavity 10 is provided with outer tooth grooves 13 uniformly distributed in the circumferential direction, the lower end of each outer tooth groove 13 axially extends to the bottom surface of the female die 7, the arc surface of each outer tooth groove 13 axially, the upper end of each outer tooth groove 13 axially extends to the lower end of the corresponding round corner of the corresponding round groove 9, and the outer tooth groove 11, the outer tooth groove 13 and the edge of each outer tooth groove 13 all round corner of the round groove 13 are all round corner of the round groove 13.

This metal forming die of spacing dish hub of car passes through the setting of extrusion chamber 9 and shaping chamber 10, can realize compound cold extrusion, has saved one set of cold extrusion die like this, has also saved the thermal treatment technology of annealing, saponification, and the intermediate process need not the relocation, and the machining precision is good, and machining efficiency is high.

When the die of the automobile limiting disc hub is used, the male die 6 is driven to lift by the upper die holder of the existing press, the female die 7 is fixedly connected to the lower die holder and penetrates through the lower die holder to be provided with the ejector rod, a cylindrical and axially through blank is placed in the extrusion cavity 9, the male die 6 descends, the inner core 8 is inserted into the axial hole of the blank, the male die 6 extrudes the blank, the blank enters the forming cavity 10, and the blank cannot shake due to the supporting and positioning effects of the inner core 8 and is high in processing precision.

To explain in detail, as shown in fig. 6, the blank is first put into the extrusion cavity 9 of the female die 7, and the blank is not cold extruded and still cylindrical as a whole; as shown in fig. 7, the male die 6 descends and presses the top of the blank, the lower end of the blank contacts the arc surface 12, the arc surface 12 plays a guiding role, meanwhile, the arc surface 12 performs primary extrusion on the lower end of the blank, the lower end of the blank forms an arc protrusion 15 adapted to the arc surface 12, and the step groove 11 is used for deformation filling of the blank, 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 male ring 4) joined to the arc protrusion 15, and the part of the outer wall of the lower end of the blank entering the male tooth groove 13 forms the external teeth 2; as shown in fig. 8, the male die 6 continues to descend and press the top of the blank, the bottom of the step groove 11 and the inner wall of the forming cavity 10 play a role of secondary extrusion, so that the outer wall of the lower end of the blank forms a cutting surface 17 jointed with the step surface 16, the diameter of the cutting surface 17 is the small diameter of the external teeth 2, and the part of the outer wall of the lower end of the blank entering the external tooth grooves 13 continues to form the external teeth 2; as shown in fig. 9, after the male die 6 descends to the right position, the blank reaches the bottom of the female die 7, the arc surface 12 and the step groove 11 enable the outer wall of the blank to form an arc-shaped protrusion 15 and a step surface 16 close to the top, and the external tooth groove 13 enables the external teeth 2 to be formed; and subsequently, the automobile limiting disc hub is processed through the existing machining process.

The inner wall of the lower part of the forming cavity 10 is provided with a ring of annular grooves 14, the inner wall of the forming cavity 10 is transited to the annular grooves 14 through round corners, and the lower ends of the annular grooves 14 are communicated to the bottom of the female die 7. The annular groove 14 reduces the contact area between the forming cavity 10 and the blank, reduces the friction resistance, is easy to form and high in precision, and is convenient for demoulding.

The angle between the groove bottom and the groove wall of the step groove 11 is 120-160 degrees, so that the guide performance is good, the abrasion is reduced, the service life of the die is prolonged, and the angle between the groove bottom and the groove wall of the step groove 11 is 140 degrees in the embodiment.

Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (5)

1. The utility model provides a spacing dish hub of car, is including being cylindric and axially through-going body (1), the upper portion outer wall circumference equipartition of body (1) have external tooth (2), the lower part outer wall of body (1) is the face of cylinder, the inner wall axial equipartition of body (1) has internal spline (3), its characterized in that, body (1) have radial evagination bulge loop (4) of round in the tip department of upper portion outer wall, the outer wall of bulge loop (4) have the round and be the annular and meet in spacing groove (5) of external tooth (2) terminal surface, the external diameter of bulge loop (4) is greater than the path of external tooth (2), the external diameter of bulge loop (4) is less than the big path of external tooth (2).

2. The automobile limiting hub according to claim 1, wherein the difference a between the outer diameter of the convex ring (4) and the small diameter of the external teeth (2) is 0.3-0.6mm.

3. The utility model provides a metal forming die of car spacing dish hub, includes terrace die (6) and die (7), wear to be equipped with coaxial setting and stretch out inner core (8) of terrace die (6) lower extreme in terrace die (6), inner core (8) are cylindricly, the diameter of inner core (8) is less than the diameter of terrace die (6), be equipped with the die cavity with terrace die (6) coaxial setting in die (7), a serial communication port, the die cavity include extrusion chamber (9) and shaping chamber (10), extrusion chamber (9) are located shaping chamber (10) upper portion and the inner wall of extrusion chamber (9) is the smooth surface, the top department of shaping chamber (10) has round step groove (11), the internal diameter of extrusion chamber (9) is greater than the internal diameter of step groove (11) cell wall and extrusion chamber (9) pass through the top of cambered surface (12) transition to step groove (11), the tank bottom downward sloping transition of step groove (11) to shaping chamber (10) inner wall, shaping chamber (10) have the bottom surface (13) of equipartition, the lower extreme of each outer tooth's socket (13) extend to the outer tooth's groove (7), the equal fillet of each axial extension of outer tooth's (13) bottom surface (13) and each axial extrusion chamber (11).

4. The metal forming die for the automobile limiting disc hub is characterized in that a ring of annular grooves (14) are formed in the inner wall of the lower portion of the forming cavity (10), the inner wall of the forming cavity (10) is in transition to the annular grooves (14) through round corners, and the lower ends of the annular grooves (14) are communicated to the bottom of the female die (7).

5. The metal forming die for the automobile limiting disc hub as claimed in claim 4, wherein the angle between the groove bottom and the groove wall of the stepped groove (11) is 120-160 °.

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