CN219169244U

CN219169244U - High surface section bar forming die

Info

Publication number: CN219169244U
Application number: CN202320247989.0U
Authority: CN
Inventors: 杨进洪
Original assignee: Ningbo Qixing Mold Manufacturing Co ltd
Current assignee: Ningbo Qixing Mold Manufacturing Co ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-06-13
Anticipated expiration: 2033-02-06

Abstract

The utility model provides a high-surface profile forming die which comprises a male die and a female die which are coaxially arranged, wherein a material cavity is formed in the male die, a die core is arranged in the material cavity, the die core is connected with the inner wall of the material cavity through circumferentially uniformly distributed split bridges, a feed inlet is formed between every two adjacent split bridges, a cavity communicated with the material cavity is formed in the end face of the female die, a welding cavity is formed in the end face of the welding cavity, a die hole penetrates through the end face of the welding cavity, a working belt for extrusion forming is arranged between the die hole and the die core, and a cooling port facing the outlet end of the working belt and used for cooling liquid nitrogen of an extruded product is formed in the side wall of the die core and/or the side wall of the die hole. According to the high-surface section forming die, the cooling port is arranged at the discharge end, online cooling treatment is realized in the extrusion production process, the surface brightness of the section is improved, the processing technology is saved, the production efficiency is further improved, and the production cost is reduced.

Description

High surface section bar forming die

Technical Field

The utility model relates to an extrusion die, in particular to a high-surface profile forming die.

Background

Hot extrusion is extrusion by heating a metal material to a hot forging temperature, that is, extrusion by heating a billet to a temperature equal to or higher than the recrystallization temperature of the metal before extrusion. In general, after hot extrusion of machine parts, machining such as cutting is used to improve dimensional accuracy and surface quality of the parts. At present, the general treatment modes of the high-surface profile products at home are polishing, grinding, finish drawing and the like, and the next treatment can be performed, so that the process is complex, the production efficiency is low, and the cost is high.

Disclosure of Invention

【1】 Technical problem to be solved

The utility model aims to provide a high-surface profile forming die which can rapidly cool the surface of a profile in the extrusion forming process and directly form a highlight surface.

【2】 Technical proposal for solving the problems

The utility model provides a high-surface profile forming die, which comprises a male die 1 and a female die 2 which are coaxially arranged, wherein a material cavity 11 is formed in the male die 1, a die core 3 is arranged in the material cavity 11, the die core 3 is connected with the inner wall of the material cavity 11 through circumferentially uniformly distributed split bridges 15, a feeding port is formed between two adjacent split bridges 15, a cavity communicated with the material cavity 11 is formed in the end face of the female die 2, a welding cavity 12 is formed in the end face of the welding cavity 12, a die hole penetrates through the end face of the welding cavity 12, a working belt for extrusion forming is arranged between the die hole and the die core 3, and a cooling port facing the outlet end of the working belt and used for carrying out liquid nitrogen cooling on an extruded product is arranged on the side wall of the die core 3 and/or the die hole.

Further, the end portion of the mold core 3 extends to the discharge end and forms a cooling portion, and the cooling port is formed in the side wall of the cooling portion.

Further, the side wall of the cooling part is provided with an annular groove 31, and the cooling port is arranged in the annular groove.

Furthermore, the cooling ports are a plurality of and circumferentially distributed uniformly.

Further, an air inlet 130 for connecting with a liquid nitrogen source is formed on the side wall of the male die 1 or the female die 2, and the air inlet 130 is communicated with the cooling port through a runner.

Further, a first runner communicated with the air inlet 130 is arranged in the male die 1 or the female die 2, the first runner is communicated with a third runner 133 arranged in the die core 3 after passing through a second runner 132 arranged in the split-flow bridge 15, and at least two first cooling ports 134 communicated with the third runner 133 are uniformly distributed on the periphery of the side wall of the die core 3.

Further, an annular fourth runner 136 is formed in the female die 2, and at least two second cooling ports 137 communicated with the fourth runner 136 are uniformly distributed on the circumferential side wall of the die hole.

Further, the second cooling hole 137 is disposed to be inclined.

Further, an annular groove is formed at the end of the die 2, and the fourth runner 136 is formed between the annular groove and the die pad 4.

【3】 Advantageous effects

According to the high-surface section forming die, the cooling structure is added on the die, the liquid nitrogen is assisted in introducing and cooling, and in the high-temperature continuous extrusion production process of aluminum materials, the liquid nitrogen is continuously filled to rapidly cool the surface of the section, so that the surface of the product is subjected to local heat treatment to form a high-brightness surface crystal structure, the high-surface brightness of the aluminum section product can be achieved only by extruding materials, complicated procedures such as polishing, grinding, finish drawing and finish drawing are omitted, the production time is saved, and the production cost is saved; the cooling ports are arranged in a two-way manner, so that the inner surface and the outer surface of the profile can be synchronously cooled, the cooling effect is good, and the surface quality is high; the cooling ports are uniformly distributed circumferentially, so that multi-angle injection of the cooling medium is realized, and further, full contact cooling is realized; the inner cooling port and the outer cooling port are positioned on the same radial surface, so that inner and outer synchronous cooling can be realized, deformation is avoided, and the molding quality of the profile is high; the second cooling port is obliquely arranged, so that the cooling medium can be sprayed towards the feeding direction, and the contact time and the cooling effect are improved; according to the high-surface section forming die, the cooling port is arranged at the discharge end, online cooling treatment is realized in the extrusion production process, the surface brightness of the section is improved, the processing technology is saved, the production efficiency is further improved, and the production cost is reduced.

Drawings

FIG. 1 is a schematic structural view of a high surface profile molding die of the present utility model;

FIG. 2 is a left side view of the high surface profile forming die of the present utility model;

FIG. 3 is a right side view of the high surface profile molding die of the present utility model;

fig. 4 is an enlarged view of a portion a in fig. 1.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1-4, the utility model provides a high-surface profile forming die, which comprises a male die 1 and a female die 2 which are coaxially arranged, wherein the male die 1 is fixed at the end part of the female die 2, accurate positioning is realized through a positioning device, a concave hole is formed in the male die 1, a material cavity 11 is formed, a die core 3 is arranged in the material cavity 11, the die core 3 is of a cylindrical structure and is coaxially arranged with the material cavity 11, at least two split bridges 15 are uniformly distributed on the circumferential direction of the side wall of the die core 3, in the embodiment, four split bridges are arranged, the other end of each split bridge 15 is connected with the inner wall of the material cavity 11, namely, the die core is fixed on the male die 1 through the split bridges, and a feed inlet is formed between two adjacent split bridges 15 and used for blank feeding; a cavity is formed on the end face of the female die 2, and a welding cavity 12 is formed, and the welding cavity 12 is communicated with the material cavity 11 and is used for welding metal; the end face of the welding cavity 12 is penetrated with a die hole which is coaxial with the film core 3, the inner wall of the die hole is provided with an annular bulge and forms an outer diameter bearing, the outer wall of the die core 3 is provided with an annular bulge and forms an inner diameter bearing, a gap is formed between the outer diameter bearing and the inner diameter bearing and forms a working belt, the working belt is used for extrusion molding of a section bar, in the application, the side wall of the die core 3 or the die hole or the side wall of the die core 3 and the die hole is provided with a cooling port facing the outlet end of the working belt, and the cooling port is used for carrying out liquid nitrogen cooling on a product (section bar) which completes extrusion molding, and continuously filling liquid nitrogen in the high-temperature continuous extrusion production process of the section bar (such as aluminum material) cools the surface of the section bar rapidly, so that the surface of the product forms a high-brightness surface crystal structure after partial heat treatment.

The tail end of the mold core 3 extends to the discharge end and forms a cooling part, and a cooling port is formed in the side wall of the cooling part; in order to fully contact the surface of the profile with the cooling medium and increase the contact area between the cooling medium and the surface of the profile, in the embodiment, the side wall of the cooling part is provided with the annular groove 31, the cooling ports are arranged in the annular groove, and the cooling ports are uniformly distributed circumferentially and are multiple, so that the multi-angle injection of the cooling medium is realized, and the full contact cooling is realized.

The side wall of the male die 1 or the female die 2 is provided with an air inlet 130, in the embodiment, the air inlet 130 is arranged on the side wall of the female die, so that the male die is convenient to assemble and disassemble, the air inlet 130 is used for being connected with a liquid nitrogen source, the air inlet 130 is in a screw structure, and the air inlet 130 is communicated with a cooling port through a flow passage, so that medium conveying is realized.

The first runner I131 a communicated with the air inlet 130 is arranged in the male die 1 or the female die 2, specifically, the first runner I131 a is arranged in the male die 1, the first runner II 131b is arranged in the female die, the first runner II 131b is communicated with the air inlet 130, the first runner I131 a is communicated with the first runner II 131b, the second runner 132 is arranged in the split-flow bridge 15, the third runner 133 is arranged in the die core 3, the third runner 133 is communicated with the air inlet 130 after passing through the second runner 132, the first runner I131 a and the first runner II 131b in sequence, and at least two first cooling ports 134 are uniformly distributed on the circumference of the side wall of the die core 3 (cooling part) and are communicated with the third runner 133 for cooling the inner wall surface of the profile.

The die 2 is internally provided with an annular fourth runner 136, at the same time, the side wall of the die hole is circumferentially and uniformly provided with at least two second cooling ports 137 which are used for cooling the outer wall surface of the profile, the second cooling ports 137 are obliquely arranged, the included angle between the second cooling ports 137 and the axis of the die hole is 25-30 degrees, the die is convenient to process and shape, the second cooling ports 137 are communicated with the fourth runner 136, the side wall of the die hole is an inclined plane, and the included angle between the second cooling ports and the axis of the die hole is 3-5 degrees, so that a cooling medium can be sprayed towards the feeding direction, the contact time is prolonged, and the cooling effect is improved.

In order to facilitate processing, an annular groove is formed at the end of the female die 2, the female die 2 is fixed on the die pad (plate) 4, after assembling, a fourth runner 136 is formed between the annular groove and the die pad (plate) 4, meanwhile, a strip-shaped groove 135 is formed at the end of the female die, one end of the strip-shaped groove is communicated with the annular groove, a first runner II 131b axially penetrates through the end face of the female die and is communicated with the strip-shaped groove 135, and further communication between an air inlet and a second cooling port is realized.

The first cooling port and the second cooling port are positioned on the same radial surface, and synchronous cooling can be realized.

During production, aluminum is heated to hot forging forming temperature for extrusion, namely, a blank is heated to be above the recrystallization temperature of aluminum before extrusion, aluminum alloy is extruded under the action of strong extrusion force and divided into a plurality of metal flows by a shunt bridge, the metal flows enter a welding chamber through a shunt hole, the metal is welded again and extruded from a working belt under the condition of high temperature, high pressure and high vacuum to form a hollow product with required shape and size, meanwhile, a second cooling opening of the inner wall of a die hole and a first cooling opening of the side wall of a die core are formed, liquid nitrogen in the cooling opening is gasified at an outlet and sprayed to the surface of the profile, the inner surface and the outer surface of the profile are respectively and rapidly cooled, and the surface of the profile is continuously and rapidly cooled by the liquid nitrogen, so that a high-brightness surface crystal structure is formed after the local heat treatment of the surface of the product.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. A high surface section bar forming die, its characterized in that: including terrace die and the die of coaxial setting, set up the material chamber on the terrace die, the intracavity is equipped with the mold core, the mold core through circumference equipartition the reposition of redundant personnel bridge with material intracavity wall connection forms the feed inlet between the adjacent two the reposition of redundant personnel bridge, the terminal surface of die set up with the cavity of material chamber intercommunication and form the seam chamber, the terminal surface of seam chamber runs through there is the nib, the nib with be equipped with the working tape that is used for extrusion between the mold core, the mold core and/or the lateral wall of nib is equipped with the orientation the exit end of working tape just is used for carrying out liquid nitrogen refrigerated cooling mouth to the product of accomplishing extrusion.

2. The high surface profile molding die of claim 1, wherein: the end part of the mold core extends to the discharge end and forms a cooling part, and the cooling port is formed in the side wall of the cooling part.

3. The high surface profile molding die of claim 2, wherein: the side wall of the cooling part is provided with an annular groove, and the cooling port is arranged in the annular groove.

4. The high surface profile molding die of claim 1, wherein: the cooling ports are a plurality of and circumferentially and uniformly distributed.

5. The high surface profile molding die of claim 1, wherein: the side wall of the male die or the female die is provided with an air inlet used for being connected with a liquid nitrogen source, and the air inlet is communicated with the cooling port through a flow channel.

6. The high surface profile molding die of claim 5, wherein: the male die or the female die is internally provided with a first flow passage communicated with the air inlet, the first flow passage is communicated with a third flow passage arranged in the die core after passing through a second flow passage arranged in the split-flow bridge, and at least two first cooling ports communicated with the third flow passage are uniformly distributed on the periphery of the side wall of the die core.

7. The high surface profile molding die of claim 5, wherein: the die is internally provided with an annular fourth runner, and the side wall of the die hole is circumferentially and uniformly provided with at least two second cooling ports communicated with the fourth runner.

8. The high surface profile molding die of claim 7, wherein: the second cooling port is obliquely arranged.

9. The high surface profile molding die of claim 7, wherein: an annular groove is formed in the end portion of the female die, and the fourth flow passage is formed between the annular groove and the die pad.