CN112246904A

CN112246904A - Semi-solid continuous extrusion forming device for wire materials

Info

Publication number: CN112246904A
Application number: CN202011156360.2A
Authority: CN
Inventors: 陈业高; 张安民; 施允洋; 邵国友
Original assignee: Suqian College
Current assignee: Suqian College
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-01-22

Abstract

The invention relates to the field of metal material processing, and discloses a wire semisolid continuous extrusion forming device, which mainly comprises: the extrusion device comprises an extrusion wheel (1), a die cavity (2) and a semi-solid slurry tank (3); the die cavity is matched with the extrusion wheel to form a closed extrusion space (4), a feed inlet (5) and a discharge outlet (6) which are communicated with the two ends of the closed extrusion space are respectively arranged at the two ends of the die cavity, a die (7) is arranged on the discharge outlet (6), the feed inlet and the discharge outlet are both arranged along the tangent line of the extrusion wheel and are vertical to each other, and the feed inlet is communicated with the semi-solid slurry tank through a transmission pipe (8); and a slurry accelerating gear (9) is also rotationally connected in the die cavity, one side of the slurry accelerating gear is positioned in the die cavity, and the other side edge of the slurry accelerating gear extends into the closed extrusion space. Compared with the prior art, the device solves the problem of large deformation resistance of solid materials, and simultaneously improves the structure performance of formed products.

Description

Semi-solid continuous extrusion forming device for wire materials

Technical Field

The invention relates to the field of metal material processing, in particular to a wire semi-solid continuous extrusion forming device.

Background

At present, the continuous extrusion technology (CONFORM) has been developed relatively mature and is mainly used for the continuous extrusion production of nonferrous metal profiles. Most of the raw materials of the CONFORM are solid rod materials which have large deformation resistance and often need preheating treatment. If the high-alloy high-strength rod material is used, the high-alloy high-strength rod material is difficult to process. Solid raw materials are rapidly nucleated by a large amount of heterogeneous materials under the condition of quenching, macroscopic diffusion is inhibited, and finally, a tissue with uniform components and fine tissue is obtained. The superior billet is then densified under the action of extrusion force and friction force and formed by an extrusion die. The product with excellent mechanical property is obtained.

Patent 201210357149.6 discloses a continuous semi-solid extrusion forming method for preparing high-strength aluminum alloy wire, which is specific to a certain semi-solid continuous extrusion and gives process parameters; but the innovative description of the method and the device is simpler.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a wire semi-solid continuous extrusion forming device, which not only solves the problem of large deformation resistance of solid materials, but also improves the structure performance of products.

The technical scheme is as follows: the invention provides a wire semisolid continuous extrusion forming device, which mainly comprises: the extrusion wheel, the die cavity and the semi-solid slurry tank; the die cavity is matched with the extrusion wheel to form a closed extrusion space, a feed port and a discharge port which are communicated with two ends of the closed extrusion space are respectively arranged at two ends of the die cavity, a die is arranged on the discharge port, the feed port and the discharge port are both arranged along a tangent line of the extrusion wheel and are vertical to each other, and the feed port is communicated with the semi-solid slurry tank through a transmission pipe; and a slurry accelerating gear is also rotatably connected in the die cavity, one side of the slurry accelerating gear is positioned in the die cavity, and the other side edge of the slurry accelerating gear extends into the closed extrusion space.

Preferably, the slurry accelerating gear is driven by a driving motor fixed on the outer wall of the die cavity.

Furthermore, a powder inlet communicated with the closed extrusion space is formed in the position, adjacent to the feed inlet, of the die cavity. The powder material inlet is arranged, so that powder material with the same components as the semi-solid slurry can be added when the semi-solid slurry just enters the closed extrusion space, on one hand, heterogeneous nucleation cores are added, so that crystal grains are fine, and on the other hand, the proportion of a liquid phase and a solid phase is adjusted, so that the slurry state is more suitable for the continuous extrusion process.

Preferably, the included angle between the powder inlet and the feeding hole is 20-45 degrees. The powder inlet and the feed inlet are prevented from being vertically arranged so as to prevent the phenomenon that back pressure is caused by sucking more external gas from the powder inlet and the phenomenon that slurry and powder are sprayed back is avoided.

Preferably, the radial dimension of the closed extrusion space gradually decreases from the feed opening to the discharge opening. The radial dimension of the closed extrusion space from the feed inlet to the discharge outlet is gradually reduced, so that the extrusion force of the extrusion wheel of the semi-solid slurry in the closed extrusion space can be gradually increased until the semi-solid slurry is communicated with the discharge outlet, and the product is convenient to mold.

Furthermore, an extrusion wheel cooling channel is arranged in the extrusion wheel; and a mold cavity cooling channel is arranged in the mold cavity. Because semi-solid state thick liquids still are in high temperature state when entering into closed extrusion space, in order to make it solidify the shaping as early as possible when reaching the mould, all be equipped with cooling channel in extrusion wheel and die cavity in this application for semi-solid state thick liquids just can obtain very fast precooling in closed extrusion space, make follow-up condensation forming's in the extrusion phase efficiency higher, and avoid the mould to lose efficacy and the product quality problem because of the too high mould that leads to of blank temperature.

Furthermore, a wheel groove is formed in the extrusion wheel, and a first plug and a second plug which are matched with the wheel groove are respectively arranged at the two ends of the die cavity. The first plug and the second plug respectively form two ends of a closed extrusion space, so that the adaptability design of the closed extrusion space is formed between the die cavity and the extrusion wheel.

The working principle and the beneficial effects are as follows: in the application, semi-solid slurry is directly conveyed into a closed extrusion space formed between a die cavity and an extrusion wheel from a semi-solid slurry tank, and when the semi-solid slurry enters from a feed port of the closed extrusion space, in order to avoid thermal erosion and thermal fatigue damage caused by overlarge thermal shock on the surface of an extrusion wheel groove due to the fact that the semi-solid slurry directly impacts the surface of the extrusion wheel, the feed port is designed to be tangent to the surface of the extrusion wheel; after the semi-solid slurry enters the closed extrusion space, the semi-solid slurry is cooled, nucleated, grown up and solidified in the closed extrusion space to form a solidified metal blank, and the solidified metal blank is subjected to the action of favorable friction force from the extrusion wheel in the closed extrusion space on one hand to enable the metal blank to be accumulated in the closed extrusion space to form extrusion force and is subjected to the action of driving force from the slurry accelerating gear on the other hand, so that the semi-solid slurry can be accelerated and transmitted in a narrow space between the slurry accelerating gear and the extrusion wheel; under the dual action of the extrusion force of the extrusion wheel and the driving force of the slurry accelerating gear, the semi-solid slurry enters the die after passing through the discharge port at a proper speed, and then is molded into a product through the die. In order to prevent the deformation resistance of the high-alloy blank which is difficult to form and high in deformation resistance from damaging the die, when the small-section profile is extruded, the discharge port is also designed to be tangent to the extrusion wheel.

Because the transmission speed of the semi-solid slurry in the closed extrusion space from the feed inlet to the discharge outlet can influence the performance of a product finally extruded from a die, if the transmission speed is too slow, the blank transmission efficiency is low, the residence time of a high-temperature blank in an extrusion wheel groove is prolonged, the thermal erosion to a non-cooling part of the tool and the die is aggravated, the thermal stress of the tool and the die is increased, the abnormal failure of the tool and the die is accelerated, preferably, the semi-solid slurry can be controlled to be rapidly transmitted from the feed inlet to the discharge outlet and rapidly molded through the die.

The semi-solid blank is in a state that part of the semi-solid blank is liquid phase and part of the semi-solid blank is solid phase, and has lower deformation resistance compared with the state of all solid phases, and is particularly beneficial to processing high-strength materials and high-alloy materials; compared with a full liquid phase blank, the semi-solid blank melt contains more nucleation cores, so that fine grain structure can be obtained, and the performance of the product is improved; by continuously extruding the semi-solid blank by the wire semi-solid continuous extrusion molding device, the blank in a high-temperature state can be subjected to severe shear deformation, and coarse phases in the blank are further crushed, so that second phases are uniformly distributed, the problem of large deformation resistance of a solid material is solved, and the structure performance of a product is improved; the continuous extrusion technology is suitable for preparing the section bars with large length-diameter ratio such as rods, wires, pipes and the like, semi-solid blanks are used as raw materials, the deformation resistance of the blanks is reduced, and the continuous extrusion preparation of the superfine wire materials, such as 0.2mm superfine wire materials, can be realized.

Drawings

FIG. 1 is a schematic perspective view of a wire semi-solid continuous extrusion molding device.

FIG. 2 is a front view of the wire semi-solid continuous extrusion molding apparatus.

FIG. 3 is a top view of the semi-solid continuous extrusion molding apparatus for wire.

Fig. 4 is a sectional view taken along the plane B-B in fig. 3.

Fig. 5 is a schematic perspective view of a mold cavity.

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

the reference numerals in fig. 1 to 6 are: 1-an extrusion wheel; 2-a mold cavity; 3-a semi-solid slurry tank; 4-sealing the extrusion space; 5-a feed inlet; 6-discharging port; 7-molding; 8-a transfer pipe; 9-a slurry accelerating gear; 10-powder inlet; 11-extrusion wheel cooling ducts; 12-a mold cavity cooling duct; 13-wheel groove; 14-a first plug; 15-second plug.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

Embodiment 1:

the embodiment provides a wire semi-solid continuous extrusion forming device, which mainly comprises an extrusion wheel 1 provided with an extrusion wheel cooling channel 11, a die cavity 2 provided with a die cavity cooling channel 12 and a semi-solid slurry tank 3, wherein the extrusion wheel 1 is provided with a wheel groove 13, two ends of the die cavity 2 are respectively provided with a first plug 14 and a second plug 15 which are matched with the wheel groove 13, the first plug 14 and the second plug 15 at two ends of the die cavity 2 are matched with the wheel groove 13 of the extrusion wheel 1 to form a closed extrusion space 4, two ends of the die cavity 2 are respectively provided with a feed inlet 5 and a discharge outlet 6 which are communicated with two ends of the closed extrusion space 4, and the radial size (d shown in figure 4) of the closed extrusion space 4 is gradually reduced from the feed inlet 5 to the discharge outlet 6; install mould 7 on discharge gate 6, feed inlet 5 and discharge gate 6 are all seted up along the tangent line of extrusion wheel 1, and feed inlet 5 and discharge gate 6 mutually perpendicular, and feed inlet 5 communicates through transmission pipe 8 with semi-solid slurry tank 3. Still rotate in die cavity 2 and be connected with thick liquids acceleration gear 9, thick liquids acceleration gear 9 is through fixing the driving motor drive on the die cavity 2 outer wall, and one side of thick liquids acceleration gear 9 is located die cavity 2, and another side edge stretches into to in the closed extrusion space 4, and the thick liquids acceleration gear 9 that is located in the closed extrusion space 4 side edge and the interval between the extrusion wheel 1 edge is less than the width of closed extrusion space 4.

The working principle of the wire semisolid continuous extrusion molding device is as follows:

the semi-solid slurry of the high alloy metal is transmitted to the transmission pipe 8 from the semi-solid slurry tank 3 through the pressure provided by the pressure pump arranged on the transmission pipe 8, then transmitted to the feeding port 5 through the transmission pipe 8, and enters the closed extrusion space 4 formed between the die cavity 2 and the extrusion wheel 1 through the feeding port 5. During the transfer process, the temperature of the transfer pipe 8 is controlled between the liquidus and solidus of the high alloy metal to ensure that the semi-solid slurry is still in a semi-solid state in the transfer pipe 8. After the semi-solid slurry enters the closed extrusion space 4, the semi-solid slurry is cooled, nucleated, grown up and solidified to form a solidified metal blank, and the solidified metal blank is subjected to the action of favorable friction force from the extrusion wheel 1 in the closed extrusion space 4 on one hand to enable the metal blank to be accumulated in the closed extrusion space 4 to form extrusion force and the action of driving force from the slurry accelerating gear 9 on the other hand to enable the semi-solid slurry to be transmitted in a narrower space between the slurry accelerating gear 9 and the extrusion wheel 1 in an accelerating manner; under the dual action of the extrusion force of the extrusion wheel 1 and the driving force of the slurry accelerating gear 9, the semi-solid slurry enters the die 7 after passing through the discharge port 6 at a proper speed, and finally is formed into a product through the die 7. Depending on the mould 7, the shaped product can be a bar, a plate, a profile, a tube or a hollow profile. In the extrusion process, circulating cooling medium is introduced into the extrusion wheel cooling pipeline 11, so that the surface temperature of the extrusion wheel 1 is controlled to be 0.5-0.85T, and T is the melting point of the high alloy metal.

Embodiment 2:

the embodiment is a further improvement of the embodiment 1, and the main improvement is that in the embodiment 1, after the semi-solid slurry enters the closed extrusion space 4, the semi-solid slurry is cooled only by virtue of the cooling pipelines in the die cavity 2 and the extrusion wheel 1, the condensation speed is slow, the forming efficiency of subsequent products is affected, and the semi-solid slurry has the defects of coarse grain structure, difficulty in controlling the slurry state and the like, so in the embodiment, a powder inlet 10 communicated with the closed extrusion space 4 is further formed in the position, adjacent to the feed port 5, of the die cavity 2, and the included angle between the powder inlet 10 and the feed port 5 is 20-45 degrees. As shown in fig. 1 and 3 to 6. Thus, after entering the closed extrusion space 4 from the feed inlet 5, the semi-solid slurry can be immediately mixed with the powder fed through the powder inlet 10, and the mixed semi-solid slurry is easier to nucleate, grow and solidify in the closed extrusion space 4, so as to ensure the subsequent molding efficiency and product performance in the mold 7.

Otherwise, this embodiment is identical to embodiment 1, and will not be described herein.

The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a half solid-state continuous extrusion device of silk material which characterized in that: the method mainly comprises the following steps: the extrusion device comprises an extrusion wheel (1), a die cavity (2) and a semi-solid slurry tank (3); the die cavity (2) is matched with the extrusion wheel (1) to form a closed extrusion space (4), a feed port (5) and a discharge port (6) which are communicated with two ends of the closed extrusion space (4) are respectively formed at two ends of the die cavity (2), a die (7) is installed on the discharge port (6), the feed port (5) and the discharge port (6) are both formed along a tangent line of the extrusion wheel (1), the feed port (5) and the discharge port (6) are perpendicular to each other, and the feed port (5) is communicated with the semi-solid slurry tank (3) through a transmission pipe (8); and a slurry accelerating gear (9) is also rotatably connected in the die cavity (2), one side of the slurry accelerating gear (9) is positioned in the die cavity (2), and the other side edge of the slurry accelerating gear extends into the closed extrusion space (4).

2. The wire semi-solid continuous extrusion molding device of claim 1, wherein: the distance between one side edge of the pulp accelerating gear (9) in the closed extrusion space (4) and the edge of the extrusion wheel (1) is smaller than the width of the closed extrusion space (4).

3. The wire semi-solid continuous extrusion molding device of claim 1, wherein: the slurry accelerating gear (9) is driven by a driving motor fixed on the outer wall of the die cavity (2).

4. The semi-solid continuous extrusion molding apparatus for wire according to any one of claims 1 to 3, wherein: and a powder inlet (10) communicated with the closed extrusion space (4) is also formed in the position, adjacent to the feed inlet (5), of the die cavity (2).

5. The wire semi-solid continuous extrusion molding device of claim 4, wherein: the included angle between the powder inlet (10) and the feeding hole (5) is 20-45 degrees.

6. The wire semi-solid continuous extrusion molding apparatus of any one of claims 1 to 3 or 5, wherein: from the feed inlet (5) to the discharge outlet (6), the radial dimension of the closed extrusion space (4) is gradually reduced.

7. The wire semi-solid continuous extrusion molding apparatus of any one of claims 1 to 3 or 5, wherein: an extrusion wheel cooling channel (11) is arranged in the extrusion wheel (1).

8. The wire semi-solid continuous extrusion molding apparatus of any one of claims 1 to 3 or 5, wherein: and a mold cavity cooling channel (12) is arranged in the mold cavity (2).

9. The wire semi-solid continuous extrusion molding apparatus of any one of claims 1 to 3 or 5, wherein: a wheel groove (13) is formed in the extrusion wheel (1), and a first plug (14) and a second plug (15) which are matched with the wheel groove (13) are respectively arranged at the two ends of the die cavity (2).