CN106975670A - A kind of ultrasonic assistant pressurizing unit and method - Google Patents

Abstract

An ultrasonic assisted extrusion device and method belong to the technical field of ultrasonic extrusion processing. The technical characteristics of the present invention are: it is composed of an ultrasonic auxiliary system and a mold extrusion device; a plurality of transducers are arranged in an annular array around the core fixing plate, and the transducers are all connected to the mold backing plate through the transducer fixing block. The ultrasonic generator is connected with the transducer, and the inner end of the transducer is installed with a horn, and a horn mounting hole is set on the core fixing plate, and the horn is inserted into the horn mounting hole, and the blank is assisted by ultrasonic waves. After extrusion, the smoothness of the extrusion surface can be improved, and the depth of the fine-grained layer on the extrusion surface can be increased, thereby improving the extrusion quality. The steps of the preparation method of the present invention: place the whole set of equipment on the press; turn on the ultrasonic auxiliary system; put the blank into the mold; the punch goes down, and according to the type of the core, extrude into a cylindrical bar or slat shape . The invention applies to the extrusion of cylindrical and lath-shaped bars.

Description

An ultrasonic assisted extrusion device and method

technical field

The invention relates to an ultrasonic extruding device and method, in particular to an ultrasonic-assisted extruding device and method, belonging to the technical field of material plastic molding.

Background technique

The explanation of the mechanism of ultrasonic vibration plastic forming mainly includes volume effect and surface effect. The explanation for the volume effect is mainly based on dislocation-related thermal softening. The high-energy excitation of ultrasonic waves promotes the migration and proliferation of dislocations in the crystal, the dislocation density increases, and the self-regulation ability of the microstructure increases. When the energy inside the crystal accumulates to a certain extent , it can produce plastic deformation out of constraints. The explanation of the surface effect mainly considers the external influence, the intermittent contact between the ultrasonic vibration and the mold makes the blank and the processing tool have an instant separation in each vibration cycle, so that the friction force is reduced; at the same time, the period of the friction force direction Sexual changes, so that the friction force not only does not hinder the processing, but becomes the processing power; in addition, the local thermal effect caused by the vibration reduces the sticking phenomenon during the processing.

At room temperature, only the basal plane can produce dislocation slip in the magnesium alloy crystal, and the plastic deformation ability at this time is very poor. However, as the temperature increases, some potential non-basal plane slip systems such as prism and cone can be activated. , the plastic deformation ability of magnesium alloy is greatly improved, and at the same time, with the increase of temperature in the deformation process, the yield strength of the material will decrease, so when the external load remains unchanged, the deformation degree of the material will increase accordingly . Ultrasound is a kind of mechanical energy. When it propagates in a solid medium, part of the energy will be absorbed or lost, because the ultrasonic wave will have thermoelastic loss, internal friction between crystal dislocations, magnetic Hysteresis loss, etc., and these lost energy will be converted into heat energy, causing the internal temperature of the medium to rise. Therefore, based on this phenomenon, this device proposes an ultrasonic-assisted extrusion device, which is expected to be able to extrude magnesium alloys at room temperature. for reference.

Contents of the invention

A brief overview of the invention is given below in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical parts of the invention nor to delineate the scope of the invention. Its purpose is merely to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

In view of this, in order to overcome the problem of difficult plastic deformation of magnesium alloys at room temperature, an ultrasonic-assisted extrusion device and method are provided, which can realize plastic deformation of magnesium alloys at room temperature.

Solution 1: The present invention provides an ultrasonic auxiliary extrusion device, including a mold extrusion device, and the mold extrusion device includes: a cavity, an extrusion core, a core fixing plate and a mold backing plate; a core fixing plate Installed on the mold backing plate, the extrusion core is installed in the core fixing plate, the upper end surface of the core fixing plate is fixed with a cavity, the cavity is connected with the extrusion core, and the blank is placed in the cavity. The punch is placed directly above the center of the cavity; an ultrasonic auxiliary extrusion device also includes an ultrasonic auxiliary system, and the ultrasonic auxiliary system includes: an ultrasonic generator, a plurality of transducers, a plurality of horns and a plurality of transducers transducer fixing block; the number of transducers, horns and transducer fixing blocks is the same; the plurality of transducer ring arrays are around the core fixing plate, and each transducer is fixed by a transducer The block is connected to the mold backing plate, and the ultrasonic generator is connected to the transducer. A horn is installed at the inner end of each transducer, and a horn mounting hole is arranged on the core fixing plate. Insert the rod into the horn mounting hole. The billet can be extruded into a sheet-shaped bar or a cylindrical bar through the action of an ultrasonic auxiliary device and an extrusion core. The ultrasonic generator converts energy to the horn through the transducer, thus completing the auxiliary extrusion process. The horn mounting hole is convenient for horn installation.

Further: the horn is horizontally inserted into the core fixing plate, and the axis of the horn perpendicularly intersects the center line of the core fixing plate.

Further: the ultrasonic auxiliary system also includes a number of horn fixing blocks consistent with the number of horns, and each horn is connected to the mold backing plate through a horn fixing block.

Further: the extrusion core is a lath extrusion core or a positive extrusion core. Various extrusion cores can be installed on the core fixing plate, such as slat extrusion cores and positive extrusion cores. A variety of ultrasonic extrusion can be completed on one mold, and different shapes can be made according to needs. bar stock.

Further: the cavity and the core fixing plate are connected together by four bolts.

Further: the core fixing plate, the transducer fixing block and the horn fixing block are fixed on the mold backing plate by welding.

Scheme 2: An ultrasonic-assisted extrusion method proposed by the present invention, which is realized based on the ultrasonic auxiliary system and die extrusion device described in Scheme 1. The specific steps are:

1. Place the whole device on the press;

2. Turn on the ultrasonic auxiliary system;

3. Put the embryo into the mold;

4. The punch goes down, and according to the type of the concave mold core, it can be extruded into a cylindrical bar or lath shape.

The invention applies to the extrusion of cylindrical and lath-shaped bars.

Further: the blank is light alloy material such as aluminum alloy or magnesium alloy.

Beneficial effect:

The invention is composed of an ultrasonic auxiliary system and a die extrusion device; the roughness of the extruded surface can be improved after the billet is extruded by the ultrasonic auxiliary, and the depth of the fine crystal layer on the extruded surface can be increased, thereby improving the extrusion quality. In the present invention, the whole set of devices is placed on the press; the ultrasonic auxiliary system is turned on; the billet is put into the mold; the punch goes down, and according to the type of the concave mold core, it can be extruded into shapes such as cylindrical bars and slats. The invention applies to the extrusion of cylindrical and lath-shaped bars.

Description of drawings

Fig. 1 is an overall sectional view of the present invention;

Fig. 2 is a three-dimensional schematic diagram of the present invention;

Fig. 3 is a mold schematic diagram of the present invention;

Fig. 4 is a plan view of the slat extrusion core;

Fig. 5 is the A-A sectional view of Fig. 4;

Fig. 6 is the top view of positive extrusion core;

Fig. 7 is the B-B sectional view of Fig. 6;

Fig. 8 is the top view of core fixing plate;

Fig. 9 is a C-C sectional view of Fig. 8 .

detailed description

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Furthermore, it should be understood that development work, while potentially complex and time-consuming, would be a routine undertaking for those skilled in the art having the benefit of this disclosure.

Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and the Other details not relevant to the present invention are described.

As shown in the accompanying drawings, the embodiment of the present invention provides an ultrasonic auxiliary extrusion device, including a die extrusion device, and the die extrusion device includes: a cavity 4, an extrusion core 7, a core fixing plate 11 and a die pad plate 10; the core fixing plate 11 is installed on the mold backing plate 10, the extruded core 7 is installed in the core fixing plate 11, and the upper end surface of the core fixing plate 11 is fixedly equipped with a cavity 4, and the cavity 4 and The extrusion core 7 is connected, the blank 6 is placed in the cavity 4, and the punch 5 is placed directly above the center of the cavity 4; an ultrasonic auxiliary extrusion device also includes an ultrasonic auxiliary system, and the ultrasonic auxiliary system includes: Ultrasonic generator 1, multiple transducers 2, multiple horns 3 and multiple transducer fixing blocks 8; the number of transducers 2, horns 3 and transducer fixing blocks 8 is the same; the multiple 2 annular arrays of transducers are around the core fixing plate 11, and each transducer 2 is connected with the mold backing plate 10 through a transducer fixing block 8, and the ultrasonic generator 1 is connected with the transducer 2, A horn 3 is mounted on the inner end of each transducer 2 , and a horn mounting hole is provided on the core fixing plate 11 , and the horn 3 is inserted into the horn mounting hole. The billet can be extruded into a sheet-shaped bar or a cylindrical bar through the action of an ultrasonic auxiliary device and an extrusion core. The ultrasonic generator converts energy to the horn through the transducer, thus completing the auxiliary extrusion process. The horn mounting hole is convenient for horn installation.

More specifically: the horn 3 is horizontally inserted into the core fixing plate 11 , and the axis of the horn 3 perpendicularly intersects the center line of the core fixing plate 11 . The ultrasonic auxiliary system also includes a number of horn fixing blocks 9 consistent with the number of horns 3 , and each horn 3 is connected to the mold backing plate 10 through a horn fixing block 9 . The extrusion core 7 is a lath extrusion core 7-1 or a positive extrusion core 7-2. Various extrusion cores can be installed on the core fixing plate, such as slat extrusion cores and positive extrusion cores. A variety of ultrasonic extrusion can be completed on one mold, and different shapes can be made according to needs. bar stock. The cavity 4 and the core fixing plate 11 are connected together by four bolts 12 . The core fixing plate 11 , the transducer fixing block 8 and the horn fixing block 9 are fixed on the mold backing plate 10 by welding.

An ultrasonic-assisted extrusion method, the specific steps are:

1. Place the whole device on the press;

2. Turn on the ultrasonic auxiliary system;

3. Put the embryo into the mold;

4. The punch goes down, and according to the type of the concave mold core, it can be extruded into a cylindrical bar or lath shape.

The invention applies to the extrusion of cylindrical and lath-shaped bars. The blank material is light alloy material such as aluminum alloy or magnesium alloy.

Although the embodiments disclosed in the present invention are as above, the content thereof is only for the convenience of understanding the technical solutions of the present invention, and is not intended to limit the present invention. Anyone skilled in the technical field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the core technical solution disclosed in the present invention, but the scope of protection defined by the present invention remains The scope defined by the appended claims shall prevail.

Claims (8)

1. a kind of ultrasonic assistant pressurizing unit, including mould pressurizing unit, the mould pressurizing unit include：Die cavity (4), squeeze Die mould core (7), core fixing plate (11) and die backing plate (10)；Core fixing plate (11) is arranged on die backing plate (10), is squeezed Die mould core (7) is arranged in core fixing plate (11), and die cavity (4), type are installed with the upper surface of core fixing plate (11) Chamber (4) is connected with extruding core (7), and embryo material (6) is placed in die cavity (4), and drift (5) is placed in the surface at die cavity (4) center；

It is characterized in that：A kind of ultrasonic assistant pressurizing unit also includes ultrasonic assistant system, the ultrasonic assistant system Including：Supersonic generator (1), multiple transducers (2), multiple ultrasonic transformers (3) and multiple transducer fixed blocks (8)；Transducer (2), ultrasonic transformer (3) is identical with transducer fixed block (8) quantity；The multiple transducer (2) annular array is in core fixing plate (11) around, each transducer (2) is set up with die backing plate (10) by a transducer fixed block (8) and is connected, ultrasound Wave producer (1) is connected with transducer (2), and the inner of each transducer (2) is mounted on a ultrasonic transformer (3), and core is fixed It is provided with plate (11) in ultrasonic transformer mounting hole, ultrasonic transformer (3) the insertion ultrasonic transformer mounting hole.

2. a kind of ultrasonic assistant pressurizing unit according to claim 1, it is characterised in that：Ultrasonic transformer (3) level Insert in core fixing plate (11), and the vertical and intersectant centerline of the axis and core fixing plate (11) of ultrasonic transformer (3).

3. a kind of ultrasonic assistant pressurizing unit according to claim 1 or 2, it is characterised in that：The ultrasonic assistant System also includes the ultrasonic transformer fixed block (9) consistent with ultrasonic transformer (3) quantity, and each ultrasonic transformer (3) passes through a ultrasonic transformer Fixed block (9) is set up with die backing plate (10) and is connected.

4. a kind of ultrasonic assistant pressurizing unit according to claim 3, it is characterised in that：It is described extruding core (7) be Lath extruding core (7-1) or forward extrusion core (7-2).

5. a kind of ultrasonic assistant pressurizing unit according to claim 4, it is characterised in that：Die cavity (4) and core are fixed Plate (11) is linked together by four bolts (12).

6. a kind of ultrasonic assistant pressurizing unit according to claim 5, it is characterised in that：Core fixing plate (11), change Energy device fixed block (8) and ultrasonic transformer fixed block (9), are fixed on by way of welding on die backing plate (10).

7. a kind of ultrasonic assistant pressing method, this method is to be based on any ultrasonic assistant system in claim 1~6 Realized with mould pressurizing unit, it is characterised in that：Specific steps：

First, ultrasonic assistant pressurizing unit is placed on forcing press；

2nd, ultrasonic assistant system is opened；

3rd, embryo material is put into mould；

4th, drift is descending, according to the type of extruding core, is squeezed into cylindrical bar or lath shape.

8. a kind of ultrasonic assistant extruding side according to claim 7, it is characterised in that：The embryo material is aluminium alloy or magnesium Alloy.