CN215144334U - Hook-shaped tooth extrusion forming die structure - Google Patents

Abstract

The utility model relates to a hook-shaped tooth extrusion forming die structure, which comprises an upper die and a lower die; the lower surface of the upper die is provided with an extrusion concave cavity which is in a circular truncated cone shape with an open outer end and is provided with an inner conical surface; the lower die is also in a round table shape and is provided with an outer conical surface corresponding to the inner conical surface, a die parting hole is formed in the center of the lower die in a penetrating mode, a plurality of tooth extrusion grooves are formed in the upper surface of the lower die, all the tooth extrusion grooves are uniformly distributed on the upper edge of the die parting hole in the circumferential direction, the tooth extrusion grooves extend in the radial direction, and the inner ends of the tooth extrusion grooves penetrate through the die parting hole; the lower die is radially decomposed into a plurality of die sections along the radial direction; the number of the die sections corresponds to that of the tooth extrusion grooves; when the inner conical surface of the extrusion concave cavity is abutted against the outer conical surfaces of all the die sections, all the die sections are driven to be folded to form a lower die, and an accommodating space is formed between the bottom wall of the extrusion concave cavity and the upper surface of the lower die; the tooth extrusion grooves are respectively arranged on the two adjacent mould halves so as to form the tooth extrusion grooves after the two adjacent mould halves are closed; and a mould split scattering driving mechanism is arranged in the mould splitting hole. The structure can realize the fine extrusion forming of the hook-shaped teeth, reduce cost and improve efficiency.

Description

Hook-shaped tooth extrusion forming die structure

Technical Field

The utility model belongs to the technical field of metal extrusion forming, concretely relates to hook-shaped tooth extrusion mould structure.

Background

Hook-shaped tooth parts are required to be used on a differential locking mechanism of an automobile, and are also called hook-shaped teeth, dog-shaped teeth or dog-shaped teeth in the industry, referring to attached figures 1 and 2, the hook-shaped tooth parts 100 are annular, a plurality of end face teeth, namely tooth main bodies 101, are arranged on one ends of the hook-shaped tooth parts in a protruding mode, the tooth main bodies 101 extend along the radial direction, extension lines of two tooth sides of the tooth main bodies 101 pass through the axis of the hook-shaped tooth parts 100, and the tooth main bodies 101 are uniformly distributed on the end faces of the hook-shaped tooth parts 100 at intervals in the circumferential direction. The tooth body 101 of the hook-shaped tooth part 100 is different from a convex tooth on a common parking gear, and at least one tooth side of the tooth body 101 is a surface inclined along a tooth root, namely the tooth side and the end surface of the hook-shaped tooth part 100 are not in a 90-degree vertical relation, but in a structural form that an included angle is an acute angle smaller than 90 degrees, and is generally about 85 degrees.

This causes a problem in that the hook-shaped tooth part 100 is formed into the end face teeth by the finish extrusion forming process, and only the conventional die structure is used for axial forging and pressing, and after the tooth main body 101 is extruded in the tooth extrusion groove corresponding to the shape thereof, the tooth side 85 ° face forms a barb and is embedded in the tooth extrusion groove, so that the extruded hook-shaped tooth part 100 cannot be removed from the die.

Therefore, the present process for manufacturing the hook tooth part 100 is: the gear body 101 is formed by performing preliminary forging forming to form a circular ring-shaped structure, end face teeth reserved with machining allowance are formed on the end face, and then the gear body is machined and formed in a material removing and milling mode, so that the efficiency is low, the rod part diameter of a formed milling cutter for machining an inclined plane is small due to small space between the teeth, and the consumption of a cutter is large. Compared with other products such as parking gears, the method of precisely extruding the tooth profile directly through the die to the final size has the advantage that the manufacturing cost of the hook-shaped tooth part 100 is much higher, and needs to be further improved and optimized.

Disclosure of Invention

The above-mentioned not enough to prior art, the to-be-solved technical problem of the utility model is to provide a hook-shaped tooth extrusion mould structure, the tooth main part of avoiding hook-shaped tooth part leads to inefficiency, problem with high costs through the mode shaping that the depiler added at present, gains the accurate extrusion of accessible mould, raises the efficiency, reduces manufacturing cost's effect.

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

the hook-shaped tooth extrusion forming die structure comprises an upper die and a lower die which are matched with each other, wherein the upper die is positioned above the lower die; the lower surface of the upper die is provided with a concave extrusion concave cavity which is in a circular truncated cone shape with an open outer end, so that the inner side wall of the extrusion concave cavity is an inner conical surface with a taper; the lower die is also in a round table shape and is provided with an outer conical surface corresponding to the inner conical surface, a penetrating die parting hole is formed in the center of the lower die along the axis, a plurality of concave tooth extrusion grooves are formed in the upper surface of the lower die, all the tooth extrusion grooves are uniformly distributed on the upper edge of the die parting hole in the circumferential direction, the tooth extrusion grooves extend along the radial direction of the lower die, and the inner ends of the tooth extrusion grooves penetrate through the die parting hole; the lower die is radially decomposed into a plurality of die sections along the radial direction; the number of the die halves corresponds to the number of the tooth extrusion grooves; when the inner conical surface of the extrusion concave cavity is abutted against the outer conical surfaces of all the die sections, all the die sections are driven to be folded to form the lower die, and an accommodating space is formed between the bottom wall of the extrusion concave cavity and the upper surface of the lower die; the tooth extrusion grooves are respectively arranged on the two adjacent mould halves so as to form the tooth extrusion grooves after the two adjacent mould halves are closed; and a mould section scattering driving mechanism is arranged in the mould separating hole so as to drive the mould sections to respectively move outwards along the radial direction after the upper mould is far away from the lower mould, and the mould sections are far away from each other and scatter.

Further improve above-mentioned technical scheme, the diapire of extrusion cavity is seted up and is run through the gas elimination hole of mould.

Furthermore, the upper die and the lower die are arranged between the fixed lower die base and the upper die base capable of vertically moving to realize the extrusion action, the upper die is fixedly connected with the lower surface of the upper die base, and each die section of the lower die is slidably arranged on the upper surface of the lower die base.

Furthermore, the lower surface of the die section is provided with a T-shaped guide rail or a dovetail-shaped guide rail, the T-shaped guide rail or the dovetail-shaped guide rail is in sliding fit with a T-shaped groove or a dovetail groove correspondingly arranged on the lower die base, and the outer end of the T-shaped groove or the dovetail groove extends outwards to penetrate through the lower die base.

Furthermore, the mould split scattering driving mechanism adopts an elastic body made of elastic polyurethane.

Further, tooth extrusion grooves are machined in half on two adjacent mold halves to form the tooth extrusion grooves when the two mold halves are closed.

Alternatively, the bottom wall of the tooth extrusion groove is integrally formed in one die piece, one side of the circumferential direction of the tooth extrusion groove penetrates the die piece and the tooth side groove wall of the tooth extrusion groove on the side is provided by the opposing face of the die piece adjacent thereto.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a hook-shaped tooth extrusion forming die structure, the smart extrusion that can be used to the tooth main part of hook-shaped tooth part goes up the mould and pushes down the in-process, extrudes the internal conical surface of cavity and the external conical surface butt of all mould lamellas, orders about all mould lamellas along radial inward movement, draws in, and adjacent mould lamella draws close and forms tooth extrusion groove, the extrusion deformation on about-the-line terminal surface tooth basis, this in-process, the hook-shaped tooth part of treating to press is in the accommodation space, the diapire of extrusion cavity also exerts pressure with the up end butt of hook-shaped tooth part. The extrusion stroke is completed, the lower end surface of the hook-shaped tooth part just contacts the upper surface of the lower die, and the tooth main body is extruded and formed in the tooth extrusion groove.

The axial and radial linkage process is realized in the extrusion process, and the precise extrusion forming of the tooth main body is effectively ensured. And after extrusion, the upper die is far away from the lower die, the die sections of the lower die move outwards along the radial direction according to the stroke design under the action of the die section scattering driving mechanism and are far away from each other to scatter, the tooth extrusion grooves are opened, the demoulding of the tooth side of the tooth main body which is at an acute angle is not influenced, the hook-shaped tooth part can be easily demoulded upwards, and the lower die is taken out.

Through the utility model discloses a hook-shaped tooth extrusion mould structure has realized the smart extrusion of the tooth main part of hook-shaped tooth part, no longer relies on the mode that the depiler added, can effectively raise the efficiency, reduces manufacturing cost.

Drawings

FIG. 1 is a schematic view of a hook tooth part of a work object of the background art;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic structural view of a hook tooth extrusion mold configuration according to an exemplary embodiment;

FIG. 4 is a top view of a lower die in an exemplary embodiment;

FIG. 5 is a schematic view of one of the mold halves of FIG. 4;

FIG. 6 is a cross-sectional view B-B of FIG. 5;

FIG. 7 is a top view of a deformable structure of the lower die in an exemplary embodiment;

FIG. 8 is a schematic view of one of the mold halves of FIG. 7;

FIG. 9 is a cross-sectional view C-C of FIG. 8;

wherein the hook-shaped tooth part 100, the tooth body 101,

the die comprises a lower die 1, a die section 11, a tooth extrusion groove 12, an outer conical surface 13, an upper die 2, an extrusion cavity 21, an inner conical surface 22 and a die section dispersion driving mechanism 3.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 3-6, the structure of the embodiment of the hook-shaped tooth extrusion molding die includes an extrusion die, the extrusion die is disposed between a fixed lower die holder (not shown) and an upper die holder (not shown) capable of moving vertically to realize extrusion, and the lower die holder and the upper die holder are provided by a forging device; the extrusion die comprises an upper die 2 and a lower die 1 which are matched with each other, and the upper die 2 is positioned above the lower die 1; the upper die 2 is detachably and fixedly connected with the lower surface of the upper die base, and the lower die 1 is arranged on the upper surface of the lower die base.

The lower surface of the upper die 2 is provided with a concave extrusion concave cavity 21, and the extrusion concave cavity 21 is in a circular truncated cone shape with an open outer end so that the inner side wall of the extrusion concave cavity is an inner conical surface 22 with taper; the lower die 1 is also in a truncated cone shape and is provided with an outer conical surface 13 corresponding to the inner conical surface 22, and the inner conical surface 22 and the outer conical surface 13 are opposite up and down; the center of the lower die 1 is provided with a through die parting hole along the axis (namely, the die parting hole is coaxial with the lower die 1 in a cone frustum shape), the upper surface of the lower die 1 is provided with a plurality of concave tooth extrusion grooves 12, the shapes of the inner cavities of the tooth extrusion grooves 12 correspond to the shapes of hook-shaped teeth to be extruded (namely, the shapes of the tooth main bodies of the hook-shaped tooth parts correspond), all the tooth extrusion grooves 12 are uniformly distributed on the upper edge of the die parting hole in the circumferential direction, the tooth extrusion grooves 12 extend along the radial direction of the lower die 1, the inner ends of the tooth extrusion grooves penetrate through the die parting hole, and the cross section of the tooth extrusion grooves 12 is of a necking structure with wide bottom and narrow upper part.

The lower die 1 is radially decomposed into a plurality of die segments 11 and is formed by gathering the die segments 11. The number of the mould halves 11 corresponds to the number of the tooth extrusion grooves 12, and each mould half 11 can be slidably connected and arranged on the upper surface of the lower mould base, and can specifically slide along the radial direction. When the upper die base capable of moving vertically drives the upper die 2 to press downwards, the inner conical surface 22 of the extrusion cavity 21 is abutted to the outer conical surfaces 13 of all the die halves 11, the pressing is continued, all the die halves 11 can be driven to be folded to form the lower die 1 in the shape of the circular truncated cone, after each die half 11 is folded to form the lower die 1 in the shape of the circular truncated cone, the inner conical surface 22 of the extrusion cavity 21 is abutted to the outer conical surfaces 13 of all the die halves 11 (the lower die 1) and is in rigid contact, and the upper die 2 cannot move downwards any more; an accommodating space is formed between the bottom wall of the extrusion concave cavity 21 and the upper surface of the lower die 1; the tooth extrusion grooves 12 are respectively arranged on the two adjacent mould halves 11 so as to form the tooth extrusion grooves 12 after the two adjacent mould halves 11 are closed; and a mould split scattering driving mechanism 3 is arranged in the mould splitting hole so as to drive each mould split 11 to move outwards along the radial direction through the mould split scattering driving mechanism 3 after the upper mould 2 is far away from the lower mould 1, and the mould split scattering driving mechanism 3 is far away from each other. When the upper die 2 is pressed downwards and the die halves 11 are folded, the working of the die half dispersion driving mechanism 3 is overcome, or the die half dispersion driving mechanism 3 does not work.

The hook-shaped tooth extrusion molding die structure of the embodiment can be used for fine extrusion molding of the tooth main body 101 of the hook-shaped tooth part 100, and during manufacturing, the hook-shaped tooth part 100 is initially forged and molded to form an annular structure and a pressed end face tooth base, wherein the end face tooth base is smaller than the tooth width (circumferential direction) and higher than the tooth height (axial direction) of the finished product size (size after fine extrusion); the upper die 2 moves upwards along with the upper die base and is far away from the lower die 1, each die section 11 of the lower die 1 moves outwards along the radial direction according to the stroke design under the action of the die section scattering driving mechanism 3 and is far away from each other to scatter, the tooth extrusion grooves 12 are opened, and the distance between the adjacent die sections 11 is smaller than the tooth width of the end face tooth base; the teeth of the initially forged hook-shaped tooth part 100 are put downward into the lower die 1, the end face tooth bases correspondingly fall into the opened tooth pressing grooves 12, the end faces of the end face tooth bases abut against the bottom wall of the tooth pressing grooves 12, and the end faces (lower end faces) of the hook-shaped tooth part 100 connected with the end face tooth bases are spaced from the upper surface of the lower die 1. The upper die 2 is pressed down along with the upper die base, in the pressing down process, the inner conical surface 22 of the extrusion cavity 21 is abutted with the outer conical surfaces 13 of all the die sections 11 to drive all the die sections 11 to move and fold inwards along the radial direction, the adjacent die sections 11 are closed to form the tooth extrusion grooves 12 to restrict the extrusion deformation of the end face tooth bases, in the process, the bottom wall of the extrusion cavity 21 is also abutted with the upper end faces of the hook-shaped tooth parts 100 and is pressed down along with the upper die 2 to drive the end face tooth bases to be extruded and formed; after the inner conical surface 22 of the extrusion cavity 21 is tightly abutted to the outer conical surfaces 13 of all the die halves 11 (the lower die 1), the upper die 2 cannot move downwards any more, the extrusion stroke is completed, the accommodating space between the bottom wall of the extrusion cavity 21 and the upper surface of the lower die 1 corresponds to the thickness of the annular structure of the hook-shaped tooth part 100, the annular structure is not extruded, the extrusion stroke is completed, the lower end surface of the hook-shaped tooth part 100 just contacts the upper surface of the lower die 1, and the end surface tooth base is extruded into the finished tooth main body 101 in the tooth extrusion groove 12, so that the axial and radial linkage process is realized in the extrusion process, and the precise extrusion forming of the tooth main body 101 is effectively ensured. After extrusion, the upper die 2 moves upwards along with the upper die base and is far away from the lower die 1, the die sections 11 of the lower die 1 move outwards along the radial direction according to the stroke design under the action of the die section scattering driving mechanism 3 and are scattered far away from each other, the tooth extrusion grooves 12 are opened, the demoulding of the tooth sides of the tooth main body 101 at an acute angle is not influenced, the hook-shaped tooth part 100 can be easily demoulded upwards, and the lower die 1 is taken out.

During implementation, the mould section scattering driving mechanism 3 can adopt a vertically telescopic conical structure, and when the mould section scattering driving mechanism extends out, the mould sections 11 are driven to scatter through the outer side surface, and when the mould section scattering driving mechanism retracts, the action that the mould sections 11 are folded under the action of the upper mould 2 is not obstructed. In this embodiment, the mold half scattering driving mechanism 3 adopts a simpler elastic body made of an elastic polyurethane material, and drives each mold half 11 to scatter through elastic expansion, when the upper mold 2 is pressed down to drive each mold half 11 to fold, the elastic body is also compressed, and generates elastic deformation and energy storage, and when the upper mold 2 moves up to be away from the lower mold 1, the energy storage of the elastic body is released, and the elastic body expands and pushes each mold half 11 to scatter, so as to facilitate the demolding and taking of the hook-shaped tooth part 100.

With continued reference to fig. 5 and 6, the tooth pressing groove 12 is formed in half on two adjacent mold halves 11 to form the tooth pressing groove 12 when the two mold halves 11 are closed. Thus, the design and the manufacture are convenient. The bottom wall of the extrusion cavity 21 is provided with a vent hole (specifically, the vent hole is located at the center of the upper die 2 along the axial direction, and the diameter of the vent hole is smaller than the inner diameter of the hook-shaped tooth part 100) which penetrates through the upper die 2. Thus, the smooth proceeding of the pressing-down process is facilitated.

Example two:

referring to fig. 7-9, the structure of the hook-shaped tooth extrusion molding die of the second embodiment is different from that of the first embodiment in that the tooth extrusion grooves 12 are not formed in half on the two adjacent die halves 11, but the bottom wall of the tooth extrusion grooves 12 is integrally formed on one die half 11, the inclined tooth side groove wall is also formed on the die half 11, the other side of the tooth extrusion grooves 12 penetrates through the die half 11 and the tooth side groove wall on the other side of the tooth extrusion grooves 12 is provided by the opposite surface of the die half 11 adjacent thereto (i.e., is formed by the corresponding portion of the opposite surface of the die half 11 adjacent thereto), and the tooth extrusion grooves 12 can be formed when the two adjacent die halves 11 are closed.

Like this, when placing hook-shaped tooth part 100, the terminal surface of terminal surface tooth basis can wholly contact on the whole diapire of tooth extrusion groove 12, and the load effect is better, does benefit to the quality that improves the accurate extrusion.

In practice, in order to ensure that the mold halves 11 slide on the lower die holder in the radial direction and prevent the mold halves 11 from being taken up when the upper die 2 moves upwards, the lower surfaces of the mold halves 11 can be integrally provided with T-shaped guide rails extending in the radial direction of the lower die 1, as shown in fig. 6; or a dovetail guide rail, as shown in fig. 9, and a T-shaped groove or a dovetail groove correspondingly formed on the lower die holder is in sliding fit with the T-shaped guide rail or the dovetail guide rail, and the outer end of the T-shaped groove or the dovetail groove extends outwards to penetrate through the lower die holder, so that the die 11 can be installed.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (7)

1. The hook-shaped tooth extrusion forming die structure comprises an upper die and a lower die which are matched with each other, wherein the upper die is positioned above the lower die; the method is characterized in that: the lower surface of the upper die is provided with a concave extrusion concave cavity which is in a circular truncated cone shape with an open outer end, so that the inner side wall of the extrusion concave cavity is an inner conical surface with a taper;

the lower die is also in a round table shape and is provided with an outer conical surface corresponding to the inner conical surface, a penetrating die parting hole is formed in the center of the lower die along the axis, a plurality of concave tooth extrusion grooves are formed in the upper surface of the lower die, all the tooth extrusion grooves are uniformly distributed on the upper edge of the die parting hole in the circumferential direction, the tooth extrusion grooves extend along the radial direction of the lower die, and the inner ends of the tooth extrusion grooves penetrate through the die parting hole;

the lower die is radially decomposed into a plurality of die sections along the radial direction; the number of the die halves corresponds to the number of the tooth extrusion grooves; when the inner conical surface of the extrusion concave cavity is abutted against the outer conical surfaces of all the die sections, all the die sections are driven to be folded to form the lower die, and an accommodating space is formed between the bottom wall of the extrusion concave cavity and the upper surface of the lower die; the tooth extrusion grooves are respectively arranged on the two adjacent mould halves so as to form the tooth extrusion grooves after the two adjacent mould halves are closed;

and a mould split scattering driving mechanism is arranged in the mould splitting hole.

2. The hook-shaped tooth extrusion molding die structure according to claim 1, wherein: the tooth extrusion groove is processed on two adjacent mould halves in half to form the tooth extrusion groove when the two mould halves are closed.

3. The hook-shaped tooth extrusion molding die structure according to claim 1, wherein: the bottom wall of the tooth extrusion groove is integrally machined on one die piece, one side of the circumferential direction of the tooth extrusion groove penetrates through the die piece, and the tooth side groove wall of the tooth extrusion groove on the side is provided by the opposite surface of the die piece adjacent to the tooth side groove wall.

4. The hook-shaped tooth extrusion molding die structure according to claim 1, wherein: the bottom wall of the extrusion cavity is provided with a degassing hole penetrating through the upper die.

5. The hook-shaped tooth extrusion molding die structure according to any one of claims 1 to 4, wherein: the upper die and the lower die are arranged between the fixed lower die base and the upper die base capable of vertically moving to realize extrusion action, the upper die is fixedly connected to the lower surface of the upper die base, and each die section of the lower die is slidably arranged on the upper surface of the lower die base.

6. The hook-shaped tooth extrusion molding die structure according to claim 5, wherein: the lower surface of the die section is provided with a T-shaped guide rail or a dovetail-shaped guide rail, the T-shaped guide rail or the dovetail-shaped guide rail is in sliding fit with a T-shaped groove or a dovetail groove correspondingly arranged on the lower die base, and the outer end of the T-shaped groove or the dovetail groove extends outwards to penetrate through the lower die base.

7. The hook-shaped tooth extrusion molding die structure according to claim 5, wherein: the mould lamella driving mechanism that looses adopts the elastomer that elastic polyurethane made.

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