CN215844939U

CN215844939U - Combined bushing and motor shaft internal spline forming die with same

Info

Publication number: CN215844939U
Application number: CN202121610609.2U
Authority: CN
Inventors: 高凤强; 苏涛; 徐爱华
Original assignee: Chongqing Chuangjing Warm Forging Forming Co ltd
Current assignee: Chongqing Chuangjing Warm Forging Forming Co ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2022-02-18
Anticipated expiration: 2031-07-15

Abstract

The utility model discloses a combined bushing and a motor shaft internal spline forming die with the same, wherein the forming die comprises an upper die and a lower die, the upper die comprises an upper film seat, an upper die sleeve and a male die which are sequentially connected from top to bottom, the lower die comprises a lower die seat and a lower die which are sequentially connected from bottom to top, the lower die is also provided with an upper concave die sleeve matched with the lower die, an upper concave die core is sleeved in the upper concave die sleeve, the middle part of the upper concave die core is provided with a processing hole which corresponds to a positioning hole and has the same axle center, the processing hole is internally provided with a combined bushing sleeved on the top end of a round steel blank to be processed, the combined bushing is cylindrical and is formed by encircling a plurality of arc-shaped plates with side ends attached to each other; the lower end of the male die extends into the machining hole and is coaxial with the machining hole, when the male die is pressed down along with the upper die sleeve, the lower end of the male die is pressed into a round steel blank to be machined, and a spline is formed through cold extrusion.

Description

Combined bushing and motor shaft internal spline forming die with same

Technical Field

The utility model relates to a preparation process of a motor shaft, in particular to a combined bushing and a motor shaft internal spline forming die with the combined bushing.

Background

The motor shaft is an extremely important part in the automobile driving motor and plays a role in fixing the rotor core and transmitting force. The connecting end of the driving motor is the output end of the motor, and the driving motor generates power and then is connected with an automatic transmission or a speed reducing mechanism of an automobile through an internal spline of the end. Therefore, the end part of the existing motor shaft is provided with an internal spline. When the existing motor shaft is manufactured, the manufacturing process comprises the working procedures of round steel blanking, stress relieving, surface phosphorization, saponification treatment, cold extrusion outer shaping, manufacturing of an inner spline by using a round steel blank subjected to cold extrusion outer shaping, machining, heat treatment and the like. When adopting cold extrusion technique to extrude the internal spline, the terrace die on going up the mould in the extrusion mould is when extruding the round steel stock, and the round steel stock can produce certain deformation by extruded one end, and then requires the processing hole diameter in the lower mould to be greater than round steel stock tip diameter, after setting up like this, in the extrusion process, it is relatively poor to lead to the axiality of extruded internal spline and motor shaft easily, appears the unqualified problem of internal spline processingquality.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the utility model are as follows: how to provide one kind can assist and wait to process the round steel stock location to when waiting to process the round steel stock by the extrusion, the adaptation round steel stock upper end warp, ensures that the area is processed the round steel stock and is always with the combination bush of extrusion terrace die with the axle center and the motor shaft internal spline forming die who has this combination bush in the course of working.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the combined bushing is characterized by being cylindrical and formed by encircling a plurality of arc-shaped plates with side ends attached to each other. Like this, the combination bush is cylindricly, and well kenozooecium can cooperate with the round steel stock top cylinder of waiting to process, and the cover is after waiting to process the round steel stock top, and outside and processing hole aperture cooperate to when receiving external force extrusion, make the work piece top after the extrusion after warping, keep cylindricly under the extrusion of combination bush, and make the work piece warp the back still be in with the axle center state with the processing hole.

Furthermore, the arc-shaped plate is provided with three pieces, and the thickness and the radian are consistent. Therefore, the external force borne by each arc-shaped plate is consistent, and the deformation between two adjacent arc-shaped plates after being extruded is also consistent.

Furthermore, at least one through groove arranged along the outer edge of each arc-shaped plate in the radial direction is arranged on the outer side of each arc-shaped plate, and the through grooves on each arc-shaped plate are arranged in a one-to-one correspondence manner; all the arc plates are clamped and fixed after the through grooves through a ring-shaped piece. Like this, set up logical groove on the arc to after logical inslot card income loop forming element, can close all arcs and enclose and link together, form a comparatively stable tube-shaped body.

Furthermore, the annular part is an annular rubber sleeve or an annular ferrule or is formed by connecting a flexible rope. Like this, when the loop forming element was annular rubber sleeve and flexible rope, when the cover was established, had certain deformation space, the cover of being convenient for was established. After the annular ferrule is arranged, the whole ferrule has rigidity compared with an annular rubber sleeve and a flexible rope made of rubber, so that the ferrule is not easy to loosen and deform under external force extrusion after being sleeved.

A motor shaft internal spline forming die comprises an upper die and a lower die, wherein the upper die comprises an upper die base, an upper die sleeve and a male die which are sequentially connected from top to bottom, the lower die comprises a lower die base and a lower die which are sequentially connected from bottom to top, and a positioning hole matched with the lower end of a round steel blank to be processed is arranged in the middle of the lower die; the lower end of the male die extends into the machining hole and is coaxial with the machining hole, when the male die is pressed down along with the upper die sleeve, the lower end of the male die is pressed into a round steel blank to be machined, and a spline is formed through cold extrusion. Therefore, the diameter of the machining hole is larger than the diameter of the cylinder at the top of the round steel blank to be machined, so that the round steel blank has enough deformation space after the male die presses the spline. And the combination bush that sets up in the processing hole can cooperate with the round steel stock of waiting to process to receive extrusion deformation back waiting to process the round steel stock, synchronous deformation, thereby ensure to wait to process the round steel stock and still can keep coaxial with the processing hole at the deformation process, with the same axle center of round steel stock, spline processingquality is high after guaranteeing spline processing. The arrangement of the upper concave die bushing and the upper concave die core can facilitate the replacement of the upper concave die core and reduce the replacement cost of the die.

Furthermore, the upper concave mold core is in a cone cylinder shape, and the outer diameter of the upper end is smaller than that of the lower end. Therefore, the diameter of the extruded end is larger and more stable in the extruding process of the male die.

Further, a backing plate is arranged between the lower die and the lower die base. Therefore, when the male die is extruded, the pressure can be transmitted to the base plate through the lower die, and the downward pressure applied to the lower die is reduced.

Furthermore, the diameter of the upper end of the male die is larger than that of the lower end of the male die, the upper end of the male die is also sleeved with a male die sleeve, the male die sleeve is arranged in a male die pressing plate, and the lower end of the male die sleeve extends into the processing hole and is coaxial with the processing hole; the male die pressing plate is fixed at the lower end of the upper die sleeve, and a step-shaped assembling hole tightly matched with the male die sleeve is formed in the middle of the male die pressing plate. Therefore, the lower end of the male die sleeve extends into the machining hole, the coaxiality of the male die and the machining hole can be effectively ensured, and the coaxiality of the male die and the machining hole is ensured when the spline is subjected to cold extrusion. The arranged male die and the male die sleeve are loss parts, and the replacement cost of the die can be effectively reduced after the male die and the male die sleeve are arranged in a split mode.

Further, the male die is a cylindrical male die with an external spline at the lower end. Thus, after the male die is pressed down, the lower end of the male die is matched with the workpiece, and the internal spline can be formed in the workpiece.

Drawings

FIG. 1 is a schematic structural diagram of a round steel to be processed in the embodiment;

FIG. 2 is an enlarged schematic view of the bushing according to the embodiment;

FIG. 3 is a schematic top view of the bushing of the embodiment;

FIG. 4 is a schematic sectional view of a forming mold for forming an internal spline of a motor shaft in an embodiment.

In the figure: the die comprises an upper die base 1, an upper die sleeve 2, a male die pressing plate 3, a male die sleeve 4, a male die 5, a lower die base 6, a backing plate 7, a lower die 8, an upper female die sleeve 9, an upper female die core 10, a machining hole 101, a round steel blank 11 to be machined, a combined bushing 12, an arc-shaped plate 121 and a through groove 123.

Detailed Description

The utility model is further illustrated with reference to the following figures and examples.

Example (b):

as shown in fig. 2 to 4, the embodiment provides a forming die for an internal spline of a motor shaft, which includes an upper die and a lower die, wherein the upper die includes an upper die base 1, an upper die sleeve 2 and a male die 5 which are sequentially connected from top to bottom, the male die 5 is a cylindrical male die with an external spline at the lower end, the lower die includes a lower die base 6 and a lower die 8 which are sequentially connected from bottom to top, and a positioning hole matched with the lower end of a round steel blank 11 to be processed is formed in the middle of the lower die 8; the lower die 8 is also provided with an upper concave die sleeve 9 matched with the lower die 8, the middle part of the upper concave die sleeve 9 is sleeved with an upper concave die core 10, the middle part of the upper concave die core 10 is provided with a processing hole 101 which corresponds to the positioning hole and has the same axle center, the processing hole 101 is matched with the boss diameter at the upper end of the round steel blank 11 to be processed, a combined bush 12 sleeved on the top end of the round steel blank 11 to be processed is arranged in the processing hole 101, the combined bush 12 is cylindrical and is formed by encircling a plurality of arc-shaped plates 121 with side ends attached; the lower end of the male die 5 extends into the machining hole 101 and is coaxial with the machining hole 101, when the male die 5 is pressed down together with the upper die sleeve, the lower end of the male die 5 is pressed into the round steel blank 11 to be machined, and a spline is formed through cold extrusion (as shown in fig. 1).

As shown in fig. 2 and 3, the arc-shaped plate 121 in this embodiment has three pieces, and has the same thickness and radian. At least one through groove 123 arranged along the outer edge of the arc-shaped plate 121 in the radial direction is arranged on the outer side of each arc-shaped plate 121, and the through grooves 123 on the arc-shaped plates 121 are arranged in a one-to-one correspondence manner; all the arc plates 121 are clamped in the through groove 123 through a ring piece and then are surrounded and fixed. Specifically, the ring-shaped piece can be an annular rubber sleeve made of rubber, can also be formed by binding after the end-to-end connection of flexible pull ropes, and can also be an annular ferrule made of plastic.

The upper concave mold core 10 is in a cone cylinder shape, and the outer diameter of the upper end is smaller than that of the lower end. A backing plate 7 is arranged between the lower die 8 and the lower die base 6. The diameter of the upper end of the male die 5 is larger than that of the lower end of the male die 5, the upper end of the male die 5 is also sleeved with a male die sleeve 4, the male die sleeve 4 is arranged in a male die pressing plate 3, and the lower end of the male die pressing plate extends into the machining hole 101 and is coaxial with the machining hole 101; the male die pressing plate 3 is fixed at the lower end of the upper die sleeve 2, and a step-shaped assembling hole tightly matched with the male die sleeve 4 is formed in the middle of the male die pressing plate 3.

As shown in fig. 4, an ejector rod is further arranged in the lower die, the ejector rod can complete extrusion of the internal spline, and after the upper die moves upwards, the processed workpiece is ejected out of the lower die. In order to ensure the jacking force, the top of the ejector rod is also provided with a top plate, and after the top plate is jacked by the ejector rod, the top plate moves upwards in the positioning hole to jack the workpiece.

In addition, in order to increase the stability of the upper female die sleeve 9, a plurality of fixing plates are circumferentially fixed on the lower die holder 6, and the fixing plates clamp the upper female die sleeve 9 between the two opposite fixing plates to realize fixation. In order to realize the guiding of pressing the upper die downwards, the upper die holder is also provided with a guide sleeve, and the lower die holder is also provided with a guide pillar the top of which is sleeved in the guide sleeve.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.

Claims

1. The combined bushing is characterized in that the combined bushing (12) is cylindrical and is formed by encircling a plurality of arc-shaped plates (121) which are attached to the side ends; at least one through groove (123) arranged along the outer radial direction of the arc-shaped plate (121) is arranged on the outer side of each arc-shaped plate (121), and the through grooves (123) on the arc-shaped plates (121) are arranged in a one-to-one correspondence manner; all the arc plates (121) are clamped in the through groove (123) through a ring piece and then are surrounded and fixed.

2. The composite bushing of claim 1, wherein said arcuate plate (121) is provided with three pieces, and has a thickness and a curvature.

3. A composite bushing according to claim 1 or 2, wherein the annular member is an annular rubber sleeve or an annular ferrule, or is connected by a flexible cord.

4. A forming die for an internal spline of a motor shaft comprises an upper die and a lower die, wherein the upper die comprises an upper die base (1), an upper die sleeve (2) and a male die (5) which are sequentially connected from top to bottom, the lower die comprises a lower die base (6) and a lower die (8) which are sequentially connected from bottom to top, a positioning hole matched with the lower end of a round steel blank (11) to be processed is arranged in the middle of the lower die (8), the forming die is characterized in that an upper concave die sleeve (9) matched with the lower die (8) is further arranged on the lower die (8), an upper concave die core (10) is sleeved in the middle of the upper concave die sleeve (9), a processing hole (101) corresponding to the positioning hole and coaxial with the positioning hole is arranged in the middle of the upper concave die core (10), the processing hole (101) is matched with the boss diameter of the upper end of the round steel blank (11) to be processed, a combined bushing (12) sleeved on the top end of the round steel blank (11) to be processed is arranged in the processing hole (101), the composite liner (12) is as claimed in claim 1 or 2; the lower end of the male die (5) extends into the machining hole (101) and is coaxial with the machining hole (101), when the male die (5) is pressed down along with the upper die sleeve, the lower end of the male die (5) is pressed into a round steel blank (11) to be machined, and a spline is formed through cold extrusion.

5. The forming die for the internal spline of the motor shaft as claimed in claim 4, wherein the upper concave die core (10) is in a cone cylinder shape, and the outer diameter of the upper end is smaller than that of the lower end.

6. The forming die for the internal spline of the motor shaft as claimed in claim 4, wherein a backing plate (7) is further arranged between the lower die (8) and the lower die holder (6).

7. The forming die for the internal spline of the motor shaft as claimed in claim 4, wherein the diameter of the upper end of the male die (5) is larger than that of the lower end of the male die (5), the upper end of the male die (5) is sleeved with a male die sleeve (4), the male die sleeve (4) is arranged in a male die pressing plate (3), and the lower end of the male die sleeve extends into the machining hole (101) and is coaxial with the machining hole (101); the male die pressing plate (3) is fixed at the lower end of the upper die sleeve (2), and a step-shaped assembling hole tightly matched with the male die sleeve (4) is formed in the middle of the male die pressing plate (3).

8. The forming die for the internal spline of the motor shaft as claimed in claim 4, wherein the male die (5) is a cylindrical male die with an external spline at the lower end.