CN216175411U

CN216175411U - Cold extrusion die capable of meeting size of high-precision internal spline of input shaft

Info

Publication number: CN216175411U
Application number: CN202122608872.4U
Authority: CN
Inventors: 蒋怡; 蒋飞
Original assignee: Changshu Jinhua Mechanical Co ltd
Current assignee: Changshu Jinhua Mechanical Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-04-05
Anticipated expiration: 2031-10-28

Abstract

The utility model discloses a cold extrusion die capable of meeting the size of an input shaft high-precision internal spline, which comprises a die body, wherein the die body is arranged in an oil press, and a shaping structure for input shaft small-diameter cold-shrinkage forming is arranged in the die body; the shaping structure is a cavity matched with the part, and the cavity is divided into an upper section and a lower section which are respectively arranged in a middle die and a lower die of an extrusion die in the die body. Through the mode, the cold extrusion die capable of meeting the size of the high-precision internal spline of the input shaft is of a shaping structure, so that the high-precision internal spline of the input shaft can be formed at one time, the extremely high size requirement and form and position tolerance requirement of the internal spline of the input shaft can be met, the strength of a formed part can be improved, and the bearing capacity, the safety and the service life of the part are improved.

Description

Cold extrusion die capable of meeting size of high-precision internal spline of input shaft

Technical Field

The utility model relates to the field of automobile parts, in particular to a cold extrusion die capable of meeting the size of a high-precision internal spline of an input shaft.

Background

The input shaft in the electronic control steering system is a connecting piece with a complex structure, and has the characteristics of compact structure, high bearing capacity and good mechanical performance, wherein the internal spline is an important transmission structure, so that the input shaft has extremely high dimensional requirement and form and position tolerance requirement.

The traditional method for machining the internal spline mainly comprises the steps of broaching machining, gear shaping machining and the like, when the spline teeth are machined by the traditional method, fibers of a tooth-shaped part are cut off by a broach, the strength of the spline is reduced, the bearing capacity of the spline is affected, meanwhile, the defects that the material utilization rate is low, the production efficiency is low, burrs are easy to generate, the burrs are not easy to remove and the like exist, and the requirement for mass production cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problem of providing the cold extrusion die capable of meeting the size of the high-precision internal spline of the input shaft, and can save the subsequent rough machining and cutting steps, save materials, greatly improve the material utilization rate and improve the production efficiency.

In order to solve the technical problems, the utility model adopts a technical scheme that: the cold extrusion die capable of meeting the requirement of the size of the high-precision internal spline of the input shaft comprises a die body, wherein the die body is arranged in an oil press, and a shaping structure for cold shrinkage forming of the small diameter of the input shaft is arranged in the die body;

the shaping structure is a cavity matched with the part, and the cavity is divided into an upper section and a lower section which are respectively arranged in a middle die and a lower die of an extrusion die in the die body.

In a preferred embodiment of the utility model, the inner diameter of the cavity of the upper section is larger than that of the cavity of the lower section, and a reducing port is arranged at the joint of the upper and lower sections of the cavity.

In a preferred embodiment of the present invention, the die body further includes an upper die base and an upper die of the extrusion die, and the upper die is connected to a boss at the bottom of the upper die base in a clearance fit manner through a groove at the top of the upper die.

In a preferred embodiment of the present invention, the upper die base is connected with the upper die, the middle die and the lower die through a core rod.

In a preferred embodiment of the utility model, the bottom of the upper die and the top of the middle die are respectively provided with a step which is matched with an inner hole of the blank holder.

In a preferred embodiment of the present invention, the upper mold and the upper mold base are fixed on the upper base plate by the blank holder located at the bottom of the upper mold.

In a preferred embodiment of the present invention, the middle mold and the lower mold are mounted in a mold cylinder on a mold cylinder bottom plate, and the middle mold and the lower mold are fixed to the mold cylinder through the blank holder located at the top of the middle mold.

In a preferred embodiment of the present invention, the upper plate and the die cylinder plate are fixed to an oil press by bolts, respectively.

The utility model has the beneficial effects that: the cold extrusion die capable of meeting the size of the high-precision internal spline of the input shaft adopts a shaping structure, so that the high-precision internal spline of the input shaft can be formed at one time, the extremely high size requirement and form and position tolerance requirement of the internal spline of the input shaft can be met, the strength of a formed part can be improved, and the bearing capacity, the safety and the service life of the part are improved.

Drawings

FIG. 1 is a schematic view of a die mounting of an oil press of a cold extrusion die capable of meeting the size of a high-precision internal spline of an input shaft according to the present invention;

FIG. 2 is a schematic structural diagram of a cold extrusion die capable of meeting the size of the high-precision internal spline of the input shaft according to the utility model;

FIG. 3 is a schematic structural diagram of a cold extrusion molding structure of an input shaft of a cold extrusion die capable of meeting the size of a high-precision internal spline of the input shaft;

FIG. 4 is a schematic structural diagram of a cold extrusion die punch head capable of meeting the requirement of the input shaft on high-precision internal spline size according to the utility model;

FIG. 5 is a left side view of FIG. 4;

FIG. 6 is a bottom view of the upper die of the cold extrusion die capable of meeting the size of the high-precision internal spline of the input shaft according to the utility model;

FIG. 7 is a cross-sectional view of a middle die in a cold extrusion die that can meet the size of the high-precision internal spline of the input shaft according to the present invention;

FIG. 8 is a cross-sectional view of a lower die of a cold extrusion die capable of meeting the size of the high-precision internal spline of the input shaft according to the utility model;

the parts in the drawings are numbered as follows: 1. an upper die holder; 2. a punch; 3. an upper die; 4. a middle mold; 5. a lower die; 6. a core rod; 7. a lower ejector rod; 8. a blank holder; 9. reducing the diameter; 10. an upper base plate; 11. a die cylinder base plate; 12. a die cylinder; 13. an oil press; 14. a mold cavity.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.

Referring to fig. 1 to 8, an embodiment of the present invention includes:

the utility model provides a can satisfy cold extrusion die of input shaft high accuracy internal spline size, includes a mould body, the mould body is installed in hydraulic press 13, this internal fixed knot who is used for the input shaft path shrinkage shaping structure that is equipped with of mould to can realize once taking shape of input shaft high accuracy internal spline, can satisfy the extremely high dimensional requirement of input shaft internal spline and geometric tolerances requirement, can also improve the intensity of part of forming simultaneously, make bearing capacity, security and the life of part obtain improving.

The shaping structure is a cavity 14 matched with a part, and the cavity 14 is divided into an upper section and a lower section which are respectively arranged in a middle die 4 and a lower die 5 of an extrusion die in the die body.

Middle mould 4 with lower mould 5 all through the excircle of maximum diameter department with mould section of thick bamboo 12 carries out clearance fit, middle mould 4 has played direction and extrusion two effects, the part is in accomplish the shaping of input shaft internal spline in middle mould 4.

The excircle boss of the upper end of the lower die 5 is in clearance fit with the groove of the lower end of the middle die 4, so that the coaxiality of the two dies is further ensured.

The middle mould 4 and the lower mould 5 are arranged in a mould barrel 12 on a mould barrel bottom plate 11, the blank holder 8 at the top of the middle mould 4 is used for fixing the middle mould 4 and the lower mould 5 with the mould barrel 12 and matching the blank holder 8 with the mould barrel 12 to play two roles of guiding and extruding, and parts are used for completing the cold-shrinkage forming of the small diameter of the input shaft in the lower mould 5.

The inner diameter of the upper section of the cavity 14 is larger than that of the lower section of the cavity 14, and a reducing port 9 is arranged at the joint of the upper section of the cavity 14 and the lower section of the cavity 14.

The mould body still include last mould 3 seat 1 with the last mould 3 of extrusion die, go up the recess of mould 3 through its top with the boss of going up 1 bottoms of mould 3 seat carries out clearance fit's mode and is connected, go up six through-holes of evenly distributed on the mould 3 seat 1, wherein three for supplying the pinhole of 6 installations of plug, three through-hole for supplying the bolt fastening, the pinhole can be guaranteed go up mould 3 seat 1 with the cooperation of last mould 3 can not take place the displacement under the condition of receiving the extrusion force.

The upper die 3 and the upper die 3 seat 1 are fixed on an upper bottom plate 10 through the blank holder 8 positioned at the bottom of the upper die 3, the upper die 3 plays a role in positioning and guiding the punch 2, and meanwhile, the blank holder 8 is matched to be tightly pressed on the upper bottom plate 10 so as to prevent the upper bottom plate from generating displacement due to huge pressure during work.

Go up the mould 3 center and be equipped with a counter bore for installation drift 2, drift 2 is installed go up in the mould 3 hole, fix with the bolt go up in the 1 hole of mould 3 seat, with go up the cooperation of mould 3 hole with clearance fit form to make the retooling time shorten, be convenient for the dismouting of drift 2, its main effect is extrusion internal planes shaping and extrude the part extremely when the extrusion well mould 4 with in the lower mould 5, accomplish extrusion work.

Go up mould 3 seat 1 with go up mould 3 well mould 4 with be connected through plug 6 between the lower mould 5, be equipped with 3 plug 6 in this embodiment, plug 6 has ensured go up mould 3 seat 1 with go up mould 3 well mould 4 with axiality between the lower mould 5 for can not produce the displacement because of the atress when the extrusion.

Go up the mould 3 bottom with well mould 4 top all is equipped with the step with 8 hole matched with of blank holder, makes blank holder 8 has played fixed spacing effect, blank holder 8 is used for preventing that the mould from taking place longitudinal displacement at the extrusion in-process, guarantees the stability of mould when the extrusion.

The upper base plate 10 and the die cylinder base plate 11 are respectively fixed on an oil press 13 through bolts, and the upper surface and the lower surface of the upper base plate and the lower surface of the die cylinder base plate both require high-precision flatness.

The upper table of the ejection cylinder of the oil press 13 is provided with a lower ejector rod 7, the lower ejector rod 7 penetrates through an inner hole of the die cylinder bottom plate 11, and after the part is extruded, the whole part is extruded out of the die to complete a single cold extrusion process.

Different from the prior art, the cold extrusion die capable of meeting the size of the high-precision internal spline of the input shaft is of a shaping structure, so that the high-precision internal spline of the input shaft can be formed at one time, the extremely high size requirement and form and position tolerance requirement of the internal spline of the input shaft can be met, the strength of a formed part can be improved, and the bearing capacity, the safety and the service life of the part are improved.

Compared with the traditional method for processing the internal spline, the processing method using the die has the advantages of high material utilization rate, high production efficiency and good mechanical property of parts, and can meet the requirement of mass production.

In the description of the present invention, it should be noted that all the components are general standard components or components known to those skilled in the art, the structure and principle of the components are known to those skilled in the technical manual or by the conventional test method, and the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings or the orientation or position relationship usually placed when the utility model product is used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus cannot be understood as limiting the present invention.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A cold extrusion die capable of meeting the size of a high-precision internal spline of an input shaft comprises a die body, wherein the die body is arranged in an oil press;

2. The cold extrusion die capable of meeting the requirement of the input shaft on the size of the high-precision internal spline is characterized in that: the inner diameter of the upper section of the cavity is larger than that of the lower section of the cavity, and a reducing port is arranged at the joint of the upper section of the cavity and the lower section of the cavity.

3. The cold extrusion die capable of meeting the requirement of the input shaft on the size of the high-precision internal spline is characterized in that: the die body further comprises an upper die base and an upper die of the extrusion die, and the upper die is connected with a boss at the bottom of the upper die base in a clearance fit mode through a groove in the top of the upper die.

4. The cold extrusion die capable of meeting the requirement of the input shaft on the high-precision internal spline size is characterized in that: the upper die base is connected with the upper die, the middle die and the lower die through core rods.

5. The cold extrusion die capable of meeting the requirement of the input shaft on the high-precision internal spline size is characterized in that: the bottom of the upper die and the top of the middle die are both provided with steps matched with inner holes of the blank holder.

6. The cold extrusion die capable of meeting the requirement of the input shaft on the high-precision internal spline size is characterized in that: and the upper die seat are fixed on the upper base plate through the blank holder positioned at the bottom of the upper die.

7. The cold extrusion die capable of meeting the requirement of the input shaft on the high-precision internal spline size is characterized in that: the middle die and the lower die are installed in a die cylinder on a die cylinder bottom plate, and the middle die and the lower die are fixed with the die cylinder through the blank holder positioned at the top of the middle die.

8. The cold extrusion die capable of meeting the requirement of the input shaft on the high-precision internal spline size is characterized in that: the upper bottom plate and the die cylinder bottom plate are respectively fixed on an oil press through bolts.