CN114850632B

CN114850632B - Heterogeneous intermetallic compound additive machining equipment and machining method thereof

Info

Publication number: CN114850632B
Application number: CN202210789893.7A
Authority: CN
Inventors: 李军兆; 杨胜; 向午渊; 温凯; 张慧杰; 欧阳涛; 肖芬
Original assignee: Hunan Jintian Investment Hunan Science And Technology Refco Group Ltd
Current assignee: Hunan Jintian Investment Hunan Science And Technology Refco Group Ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-10-21
Anticipated expiration: 2042-07-06
Also published as: CN114850632A

Abstract

The invention discloses heterogeneous intermetallic compound additive processing equipment and a processing method thereof. Heterogeneous intermetallic compound vibration material disk equipment includes hot plate, first welding source, diplopore and send a contact tip, first thread feeder, second thread feeder and second welding source, the hot plate is used for placing the base plate, first welding source is used for adding the hot melt to vibration material disk layer on the base plate, first thread feeder with the second thread feeder all with the diplopore send a contact tip to connect and respectively with the diplopore send a first thread hole, the second of contact tip to send the thread hole to communicate with each other, second welding source can move and be used for adding material deposition layer heating melt, the diplopore send a contact tip first welding source with second welding source all with the hot plate sets up relatively. The heterogeneous intermetallic compound additive processing equipment can improve the structural property uniformity of the complex special-shaped component.

Description

Heterogeneous intermetallic compound additive machining equipment and machining method thereof

Technical Field

The invention relates to heterogeneous intermetallic compound additive processing equipment and a processing method thereof.

Background

Intermetallic compounds such as Ti-Al series are obtained by composing two or more elements in a certain ratio. The TiAl intermetallic compound has the characteristics of oxidation resistance, high temperature resistance and corrosion resistance, is suitable for being used in an environment of 600-1000 ℃, and is expected to become an important material of an aeroengine. However, the room temperature plasticity of the intermetallic compound is poor, the traditional intermetallic compound processing means is easy to cause the defects of component cracks and the like of the product, and particularly for complex irregular components, the processing technology is complicated and the cost is high.

At present, small-batch complex special-shaped components are generally manufactured by an additive manufacturing technology. The traditional electric arc and laser wire filling and material increasing technology is mature, two or more heterogeneous welding wires are melted by adopting a heat source, wherein the main heat source is mainly used for melting the welding wires to form a molten pool, and the rear heat source is used for reducing the cooling speed and the supercooling degree of the molten pool, promoting elements to be fully diffused and avoiding the generation of thermal cracks. However, due to the melting characteristics and the difference of the wire feeding speeds of the two welding wires, the stability of a heat source and a molten pool in the additive manufacturing process is hindered, and if the molten heterogeneous metal cannot be fully diffused, the component segregation of the complex special-shaped component can be caused, so that the service performance of the final complex special-shaped component is influenced. The mode of arranging the dissimilar welding wires on the single side and vibrating the wires is adopted, so that the transition speed of molten drops at the end parts of the welding wires is increased, and the element uniformity is further improved.

Disclosure of Invention

Based on this, it is necessary to provide a heterogeneous intermetallic compound additive processing apparatus. The heterogeneous intermetallic compound additive machining equipment disclosed by the invention can be suitable for heterogeneous metal reinforced additive manufacturing, and can improve the structural property uniformity of a complex special-shaped component.

A heterogeneous intermetallic compound additive processing device comprises a heating plate, a first welding power supply, a double-hole wire feeding conductive nozzle, a first wire feeder, a second wire feeder and a second welding power supply, wherein the heating plate is used for placing a substrate, the first welding power supply is used for heating an additive deposition layer on the substrate, first send a machine with the second send a machine all with the diplopore send a contact tip to connect and respectively with the diplopore send a first silk hole, the second of sending a contact tip to send the silk hole to communicate with each other, second welding source welding power supply can move and be used for heating the material increase sedimentary deposit, the diplopore send a contact tip first welding source welding power supply with second welding source all with the hot plate sets up relatively.

In some of these embodiments, the first welding power source is a laser configured to emit laser light to the additive deposit layer or a TIG arc heat source, and the second welding power source is a TIG arc heat source including a TIG welding torch coupled to a trailing TIG arc power source, the TIG welding torch being movable and configured to emit an arc to the additive deposit layer, and a trailing TIG arc power source.

In some of these embodiments, the heterogeneous intermetallic additive processing apparatus further comprises a wire feed oscillator coupled to the dual orifice wire feed contact tip.

In some of these embodiments, the heterogeneous intermetallic additive processing plant further comprises a protective drag shield connected to and movable with the trailing TIG welding gun.

In some embodiments, the distance between the first wire feeding hole and the second wire feeding hole on the double-hole wire feeding contact tube is 0.2 to 0.5mm.

A heterogeneous intermetallic compound additive processing method comprising the steps of:

step 1: controlling the temperature of the heating plate to be 400-500 ℃;

step 2: adjusting the included angle between the wire feeding direction of the double-hole wire feeding conductive nozzle and the heating plate to be 30-45 degrees, and adjusting the distance between the double-hole wire feeding conductive nozzle and the center of a main heat source of the first welding power supply to be 0-2mm;

and step 3: adjusting the angle between a second welding power supply and the heating plate to be 45-60 degrees, and adjusting the distance between the main heat source center of the second welding power supply and the main heat source center of the first welding power supply to be 5-10mm;

and 4, step 4: respectively adjusting the welding parameters of the double heat sources, and adjusting the wire feeding speeds of the two wire feeders;

and 5: controlling the vibration amplitude and frequency of the double-hole wire feeding contact tube;

and 6: introducing protective gas, controlling a first wire feeder and a second wire feeder to respectively feed wires into a first wire feeding hole and a second wire feeding hole of the double-hole wire feeding conductive nozzle, controlling the double-hole wire feeding conductive nozzle, the first welding power supply and the second welding power supply to synchronously move according to a preset path to perform additive manufacturing, and continuously introducing the protective gas after the additive manufacturing is finished until a molten pool is cooled to be not higher than 200 ℃, wherein the double-hole wire feeding conductive nozzle, the first welding power supply and the second welding power supply integrally ascend to a preset height after being reset;

and 7: repeat step 6 above.

In some embodiments, a wire feeding oscillator is arranged at the mouth of the double-hole wire feeding conductive nozzle, and the vibration frequency of the wire feeding oscillator is controlled to be 200Hz to 2000Hz, and the vibration amplitude is controlled to be 0.2-0.5mm.

In some embodiments, the wire feeding material of the first wire feeder is titanium wire, the wire feeding material of the second wire feeder is aluminum wire, and the wire feeding material of the first wire feeder is located above the wire feeding material of the second wire feeder.

In some of these embodiments, the first welding power source is a laser or a TIG arc heat source and the second welding power source is a TIG arc heat source.

In some embodiments, the laser power of the first welding power supply is controlled to be 1000 to 2500W;

or controlling the current of a TIG arc power supply of the first welding power supply to be 80 to 150A, controlling the welding current of a TIG welding gun of the second welding power supply to be 60 to 100A, controlling the welding speed to be 0.1 to 0.5m/min, and controlling the extension length of the welding wire to be 3 to 6mm.

In some embodiments, the wire feeding speed of the first wire feeder is controlled to be 0.3 to 0.9m/min, and the wire feeding speed of the second wire feeder is controlled to be 0.3 to 0.6m/min.

The heterogeneous intermetallic compound additive processing equipment solves the problems of welding wire melting instability, uneven element structure and post-welding stress cracking in the existing heterogeneous metal arc or laser additive process. Above-mentioned heterogeneous intermetallic compound vibration material disk equipment adopts the vibration material disk form of double heat source, wherein main heat source can be laser or TIG electric arc, a melting for heterogeneous double filament, the position of advancing of double filament all is located main heat source's rear, send a contact tip to feed through the diplopore, the double filament is arranged from top to bottom, wherein the welding wire that the melting point is high is at the upside, the welding wire that the melting point is low is at the downside, the double filament advances the silk machine through first thread feeding machine, the second and advances the silk machine and advance, consequently, wire feed speed can be controlled respectively.

The heterogeneous intermetallic compound additive processing equipment is provided with the wire feeding oscillator at the position of the double-hole wire feeding contact nozzle, the wire feeding oscillator can accelerate the transition of molten drops at the end part of a welding wire on the one hand, and can oscillate and stir a molten pool on the other hand to mix elements in the molten pool, so that the additive manufacturing of an intermetallic compound sample is finally realized.

According to the heterogeneous intermetallic compound additive processing equipment, the auxiliary heat source is a rear TIG arc power supply, and the auxiliary heat source is positioned behind the laser or TIG arc heat source and used for prolonging the existence time of an additive manufacturing molten pool, so that the homogeneous mixing of elements is facilitated, and the cooling speed is slowed down.

In conclusion, the heterogeneous intermetallic compound additive processing equipment provided by the invention can slow down the solidification rate of the molten pool and promote the sufficient diffusion of heterogeneous metal elements by introducing the double heat sources of the first welding power supply and the second welding power supply. The wire-feeding oscillator can increase the molten drop transition and promote the diffusion of elements in a molten pool. The double-hole wire feeding mode of the double-hole wire feeding conductive nozzle is beneficial to adapting to additive manufacturing of a special-shaped track.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.

For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.

Fig. 1 is a schematic view of a heterogeneous intermetallic compound additive manufacturing apparatus according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an additive manufacturing apparatus for heterogeneous intermetallic compounds according to an embodiment of the present invention.

Description of the reference numerals

1. A first welding power supply; 2. a laser beam; 3. a first wire feeder; 4. a second wire feeder; 5. a rear TIG arc power supply; 6. heating the plate; 7. an additive deposition layer; 8. a welding wire oscillator; 9. a TIG welding torch; 10. a protective drag cover; 11. a double-hole wire feeding conductive nozzle; 12. a first wire feed hole; 13. and a second wire feeding hole.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present numbers, and larger, smaller, inner, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The embodiment of the application provides a heterogeneous intermetallic compound vibration material disk processing equipment to solve defects such as product component crackle easily caused by traditional intermetallic compound processing means, especially to complicated dysmorphism component, the processing technology is complicated, the cost is higher, heat source and molten bath stability in the vibration material disk manufacturing process are obstructed, if the heterogeneous metal of melting can not fully diffuse simultaneously, can lead to complicated dysmorphism component to appear composition segregation, influence final complicated dysmorphism component service performance's problem. The following description will be made with reference to the accompanying drawings.

Fig. 1 shows an example of the heterogeneous intermetallic compound additive processing apparatus provided in an embodiment of the present application, and fig. 1 is a schematic structural diagram of the heterogeneous intermetallic compound additive processing apparatus provided in the embodiment of the present application. The heterogeneous intermetallic compound additive processing apparatus of the present application can be used for heterogeneous intermetallic compound additive processing applications.

In order to more clearly illustrate the structure of the heterogeneous intermetallic compound additive processing device, the heterogeneous intermetallic compound additive processing device will be described below with reference to the accompanying drawings.

Exemplarily, please refer to fig. 1, where fig. 1 is a schematic structural diagram of a heterogeneous intermetallic compound additive manufacturing apparatus according to an embodiment of the present application. The utility model provides a heterogeneous intermetallic compound vibration material disk equipment, includes hot plate 6, first welding power supply 1, diplopore send a contact tip 11, first wire feeder 3, second wire feeder 4 and second welding power supply. The heating plate 6 is used for placing the additive deposition layer 7. The first welding power supply 1 is used to heat the additive deposition layer 7. The first wire feeder 3 and the second wire feeder 4 are both connected with the double-hole wire feeding contact nozzle 11 and are respectively communicated with a first wire feeding hole 12 and a second wire feeding hole 13 of the double-hole wire feeding contact nozzle 11. The second welding power supply is movable and is used to heat the additive deposition layer 7. The double-hole wire feeding contact tip 11, the first welding power supply 1 and the second welding power supply are arranged opposite to the heating plate 6.

In some of these embodiments, the first welding power supply 1 is a laser or a TIG arc heat source. The first welding power supply 1 is used to deliver laser light to the additive deposition layer 7.

The second welding power source is a TIG electric arc heat source. Referring to fig. 1, fig. 1 shows a schematic diagram in which the first welding power source 1 is a laser and the second welding power source is a TIG arc heat source. An example in which the first welding power source 1 is a TIG arc heat source and the second welding power source is a TIG arc heat source is not shown in the drawings. The TIG arc heat source comprises a TIG welding gun 9 and a rear TIG arc power supply 5. The TIG welding torch 9 is connected to the rear TIG arc power supply 5, and the TIG welding torch 9 is movable and adapted to discharge an arc to the additive deposition layer 7. According to the heterogeneous intermetallic compound additive processing equipment, the auxiliary heat source is the rear TIG arc power supply 5 and is positioned behind the TIG arc heat source, so that the existence time of an additive manufacturing molten pool is prolonged, uniform mixing of elements is facilitated, and the cooling speed is slowed down.

In some of these embodiments, the heterogeneous intermetallic compound additive processing apparatus further comprises a wire feed oscillator. The wire feeding oscillator is connected to the double-hole wire feeding contact nozzle 11. The heterogeneous intermetallic compound additive machining equipment is provided with the wire feeding oscillator at the position of the double-hole wire feeding contact nozzle 11, the wire feeding oscillator can accelerate the transition of molten drops at the end of a welding wire on one hand, and can oscillate and stir a molten pool on the other hand to mix elements in the molten pool, so that the additive manufacturing of an intermetallic compound sample is finally realized.

In some of these embodiments, the heterogeneous intermetallic compound additive processing apparatus further comprises a protective drag shroud 10. The protective drag cover 10 is connected to the second welding gun and can move synchronously with the second welding gun.

In some embodiments, the distance between the first wire feeding hole 12 and the second wire feeding hole 13 on the double-hole wire feeding contact tip 11 is 0.2 to 0.5mm.

In some embodiments, the dual-hole wire feeding contact tip 11 is bent such that the wire feeding direction of the dual-hole wire feeding contact tip 11 forms an angle of 30 ° -45 ° with the heating plate 6.

In some embodiments, the first welding power supply 1, the dual-hole wire feeding contact tip 11, the first wire feeder 3, the second wire feeder 4, and the second welding power supply are all mounted on a multi-directional movement mechanism, and the multi-directional movement mechanism can move according to a preset program track to perform additive manufacturing. The multi-directional movement mechanism may be a six-axis robotic arm.

In some embodiments, the substrate may be a pure titanium plate, the substrate is mounted and fixed on the heating plate 6, and when in operation, the heating plate 6 heats and keeps the temperature of the substrate to 400 ℃ to 500 ℃.

The heterogeneous intermetallic compound additive processing equipment solves the problems of welding wire melting instability, uneven element structure and post-welding stress cracking in the existing heterogeneous metal arc or laser additive process. Above-mentioned heterogeneous intermetallic compound vibration material disk equipment adopts the vibration material disk form of dual heat source, wherein main heat source can be laser or TIG electric arc, a melting for heterogeneous double filament, the position of sending into of double filament all is located main heat source's rear, send into through diplopore silk feed contact tube 11, the double filament is arranged from top to bottom, wherein the welding wire that the melting point is high is at the upside, the welding wire that the melting point is low is at the downside, the double filament is sent into through first wire feeder 3, the second wire feeder, consequently, wire feed speed can be controlled respectively.

An embodiment of the invention further provides a heterogeneous intermetallic compound additive processing method.

step 1: the temperature of the heating plate 6 is controlled to be 400-500 ℃.

Step 2: the included angle between the wire feeding direction of the double-hole wire feeding contact tip 11 and the heating plate 6 is adjusted to be 30-45 degrees, and the distance between the double-hole wire feeding contact tip 11 and the center of the main heat source of the first welding power supply 1 is adjusted to be 0-2mm.

And step 3: and adjusting the angle between the second welding power supply and the heating plate 6 to be 45-60 degrees, and adjusting the distance between the main heat center of the second welding power supply and the main heat center of the first welding power supply 1 to be 5-10 mm.

And 4, step 4: and respectively adjusting the welding parameters of the double heat sources and adjusting the wire feeding speeds of the two wire feeders.

And 5: the vibration amplitude and frequency of the double-hole wire feeding contact tip 11 are controlled.

Step 6: and introducing protective gas, controlling the first wire feeder 3 and the second wire feeder 4 to respectively feed wires into a first wire feeding hole 12 and a second wire feeding hole 13 of the double-hole wire feeding contact nozzle 11, controlling the double-hole wire feeding contact nozzle 11, the first welding power supply 1 and the second welding power supply to synchronously move according to a preset path to perform additive manufacturing, and continuously introducing the protective gas until a molten pool is cooled to be not higher than 200 ℃ after the additive manufacturing is finished, wherein the double-hole wire feeding contact nozzle 11, the first welding power supply 1 and the second welding power supply are integrally lifted to a preset height (the preset height is the height of each layer of additive) after being reset.

And 7: repeat step 6 above.

In some embodiments, a wire-feeding oscillator is arranged at the mouth of the double-hole wire-feeding contact nozzle 11, and the vibration frequency of the wire-feeding oscillator is controlled to be 200Hz to 2000Hz, and the vibration amplitude is controlled to be 0.2-0.5mm.

In some of these embodiments, the wire feed material of the first wire feeder 3 is titanium wire, the wire feed material of the second wire feeder 4 is aluminum wire, and the wire feed material of the first wire feeder 3 is located above the wire feed material of the second wire feeder 4.

In some of these embodiments, the wire feeding material TC4 of the first wire feeder 3 is pure titanium, and the wire feeding material of the second wire feeder 4 is pure aluminum wire.

In some of these embodiments, the first welding power source 1 is a laser or a TIG arc heat source and the second welding power source is a TIG arc heat source.

In some embodiments, the laser power of the first welding power supply 1 is controlled to be 1000 to 2500w;

or controlling the current of an arc power supply of the first welding power supply to be 80 to 150A, controlling the welding current of a TIG welding gun 9 of the second welding power supply to be 60 to 100A, controlling the welding speed to be 0.1 to 0.5m/min, and controlling the extension length of the welding wire to be 3 to 6mm.

In some embodiments, the wire feeding speed of the first wire feeder 3 is controlled to be 0.3 to 0.9m/min, and the wire feeding speed of the second wire feeder 4 is controlled to be 0.3 to 0.6m/min.

Example 1

The embodiment provides a heterogeneous intermetallic compound additive processing method.

In this example, a TiAl intermetallic compound member having a length of 150mm, a width of 3mm and a height of 50mm was produced.

the first welding power supply 1 is selected as a laser, and the second welding power supply is a TIG electric arc heat source.

Step 1: the pure titanium plate with the thickness of 10mm is selected as the substrate, the substrate is installed and fixed on the heating plate 6, and the heating plate 6 works and heats the pure titanium plate to 450 ℃ and then starts to preserve heat.

And 2, step: and loading the additive sample running track to a control system, and determining the starting position and the ending position, wherein the control system can control the multi-azimuth movement mechanism to move according to the additive sample running track. Adjusting the included angle between the wire feeding direction of the double-hole wire feeding contact nozzle 11 and the heating plate 6 to be 30 degrees, and adjusting the distance between the double-hole wire feeding contact nozzle 11 and the main heat source center (laser heat source center position) of the first welding power supply 1 to be 1mm; the angle of the laser beam 2 of the first welding power supply 1 to the vertical direction is adjusted to 5 °.

And step 3: the angle between the second welding power supply and the heating plate 6 is adjusted to be 45 degrees, and the distance between the main heat source center of the second welding power supply and the main heat source center (the center position of the laser heat source) of the first welding power supply 1 is adjusted to be 6mm.

And 4, step 4: and respectively adjusting the welding parameters of the double heat sources and adjusting the wire feeding speeds of the two wire feeders. The wire feeding speed of the first wire feeder 3 is controlled to be 0.4m/min, and the wire feeding speed of the second wire feeder 4 is controlled to be 0.4m/min.

And 5: the vibration of the wire feeding oscillator is controlled to control the vibration frequency of the double-hole wire feeding contact nozzle 11 to be 1000Hz and the vibration amplitude to be 0.2mm.

Step 6: and introducing protective gas, wherein the protective gas of a TIG welding gun 9 of the second welding power supply is 8L/min, and the protective gas of a rear protective dragging cover 10 is 20L/min. Controlling the first wire feeder 3 and the second wire feeder 4 to feed wires into a first wire feeding hole 12 and a second wire feeding hole 13 of the double-hole wire feeding contact nozzle 11, wherein the wire feeding material of the first wire feeder 3 is pure titanium wire, the wire feeding material of the second wire feeder 4 is pure aluminum wire, and the wire feeding material of the first wire feeder 3 is located above the wire feeding material of the second wire feeder 4.

Controlling the laser power of the first welding power supply 1 to be 2500W, wherein the laser adopts a circular scanning mode, the swinging frequency is 200Hz, and the amplitude is 0.5mm; the current of a rear TIG electric arc power supply 5 of the second welding power supply is controlled to be 80A, and the welding speed is controlled to be 0.4m/min.

And 7: and controlling the multi-directional movement mechanism to move at the speed of 0.3m/min, and driving the double-hole wire feeding contact tip 11, the first welding power supply 1 and the second welding power supply to synchronously move according to a preset path by the multi-directional movement mechanism to perform additive manufacturing. And stopping the motion after the additive manufacturing reaches the set length of 150 mm. And continuously introducing protective gas after the additive manufacturing is finished until the molten pool is cooled to be not higher than 200 ℃. And then the signals of the first welding power supply 1, the second welding power supply, the first wire feeder 3, the second wire feeder 4 and the wire feeding oscillator are closed, and the protective gas is closed after waiting for 40 s. The multi-azimuth movement mechanism drives the double-hole wire feeding contact tube 11, the first welding power supply 1 and the second welding power supply to reset, and the additive manufacturing thickness of each layer is about 1.5mm, so that after each layer is processed, the multi-azimuth movement mechanism drives the double-hole wire feeding contact tube 11, the first welding power supply 1 and the second welding power supply to rise by 1.5mm (the height of each layer of additive) for the additive manufacturing of the next layer.

And step 8: and (3) after the additive temperature of the highest layer reaches 450 ℃, repeating the step (7) and depositing the next layer until the size of the component reaches 50mm of a preset design value, so as to obtain the TiAl intermetallic compound component with uniform structure.

And step 9: the finished TiAl intermetallic compound member can be prepared into a sample, and the sample can be machined according to the actual use shape.

The TiAl intermetallic compound member of the present example had a uniform structure and no cracks.

Example 2

In this example, a TiAl intermetallic compound member having a length of 150mm, a width of 3mm and a height of 50mm was produced. A heterogeneous intermetallic compound additive processing method of the present example is substantially the same as example 1 except that: embodiment 2 selects the first welding power source 1 as a TIG arc heat source and the second welding power source as a TIG arc heat source. In the first welding power supply 1, the peak current of the pulse TIG arc is 250A, the base current is 70A, the duty ratio is 60%, and the pulse frequency is 150Hz. The other steps and parameter settings in example 2 were the same as those in example 1. The TiAl intermetallic compound member of the present example had a uniform structure and no cracks.

Example 3

The purpose of this example is to perform surface cladding, depositing on the surface of a substrate (titanium plate) with a deposition area of 100mm × 100mm × 1mm, and a multi-directional movement mechanism moving in zigzag with a lapping rate of 40%.

Comparative example 1

The present comparative example provides a heterogeneous intermetallic compound additive processing method.

The TiAl intermetallic compound member of 150mm in length, 3mm in width and 50mm in height was produced in this example. A heterogeneous intermetallic compound additive processing method of this comparative example is substantially the same as example 1 except that: in the comparative example, only the first welding power supply 1 is adopted, the first welding power supply 1 is a laser, namely, a laser single heat source is adopted, and other steps and parameter settings in the comparative example 1 are the same as those in the example 1. In the additive manufacturing process, because the solidification speed of the laser heat source is higher, the phenomenon of element segregation of a sample structure is found, and the uniformity of the structure is reduced; meanwhile, due to the fact that the cooling speed is accelerated, micro cracks appear on the surface of the additive test sample, and the overall performance of the TiAl intermetallic compound component is affected.

Comparative example 2

The TiAl intermetallic compound member of 150mm in length, 3mm in width and 50mm in height was produced in this example.

A heterogeneous intermetallic compound additive processing method of this comparative example is substantially the same as example 1 except that: the comparative example does not use a wire-feeding oscillator, and the other steps and parameter settings in comparative example 2 are the same as those in example 1. In comparative example 2, it was found that the droplet transfer frequency was significantly reduced, and the droplets were collected and exploded at the end of the wire, resulting in more spatter; meanwhile, the tissue uniformity of the additive sample is relatively weakened, and the final use performance of the additive sample is influenced.

In conclusion, the heterogeneous intermetallic compound additive processing equipment can slow down the solidification rate of a molten pool and promote the sufficient diffusion of heterogeneous metal elements by introducing the double heat sources of the first welding power supply 1 and the second welding power supply. The wire-feeding oscillator can increase the molten drop transition and promote the diffusion of elements in a molten pool. The double-hole wire feeding mode of the double-hole wire feeding contact tube 11 is beneficial to adapting to the additive manufacturing of the special-shaped track.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The heterogeneous intermetallic compound additive processing equipment is characterized by comprising a heating plate, a first welding power supply, a double-hole wire feeding conductive nozzle, a first wire feeder, a second wire feeder and a second welding power supply, wherein the heating plate is used for placing a substrate, the first welding power supply is used for heating and melting an additive deposition layer on the substrate, the first wire feeder and the second wire feeder are both connected with the double-hole wire feeding conductive nozzle and are respectively communicated with a first wire feeding hole and a second wire feeding hole of the double-hole wire feeding conductive nozzle, the distance between the first wire feeding hole and the second wire feeding hole on the double-hole wire feeding conductive nozzle is 0.2 to 0.5mm, the second welding power supply can move and is used for heating and melting the additive deposition layer, and the double-hole wire feeding nozzle, the first welding power supply and the second welding power supply are both arranged opposite to the heating plate, wherein the second welding power supply is positioned behind the first welding power supply; the double wires in the double-hole wire feeding contact tube are arranged up and down, wherein the welding wires with high melting points are arranged at the upper side, the welding wires with low melting points are arranged at the lower side, the double wires are fed by the first wire feeder and the second wire feeder, and the wire feeding speeds are respectively controlled; the heterogeneous intermetallic compound additive machining equipment further comprises a wire feeding oscillator, wherein the wire feeding oscillator is connected to the double-hole wire feeding contact nozzle, the vibration frequency of the wire feeding oscillator is controlled to be 200Hz to 2000Hz, and the vibration amplitude is controlled to be 0.2-0.5mm.

2. The dissimilar intermetallic compound additive manufacturing device according to claim 1, wherein the first welding power source is a laser for discharging laser energy to the additive deposition layer or a TIG arc heat source, and the second welding power source is a TIG arc heat source including a TIG welding torch connected to the post TIG arc power source and a post TIG arc power source movable for discharging arc energy to the additive deposition layer, wherein the post TIG arc power source of the second welding power source is located behind the laser or the TIG arc heat source of the first welding power source.

3. The heterogeneous intermetallic compound additive machining apparatus according to any one of claims 1 to 2, further comprising a protective drag cover connected to the second welding power supply and capable of moving with the second welding power supply.

4. A heterogeneous intermetallic compound additive processing method using the heterogeneous intermetallic compound additive processing apparatus according to any one of claims 1 to 3, comprising the steps of:

step 1: controlling the temperature of the heating plate to be 400-500 ℃;

and 2, step: adjusting the included angle between the wire feeding direction of the double-hole wire feeding contact nozzle and the substrate to be 30-45 degrees, and adjusting the distance between the double-hole wire feeding contact nozzle and the center of a main heat source of the first welding power supply to be 0-2mm;

step 6: introducing protective gas, controlling a first wire feeder and a second wire feeder to respectively feed wires into a first wire feeding hole and a second wire feeding hole of the double-hole wire feeding conductive nozzle, controlling the double-hole wire feeding conductive nozzle, the first welding power supply and the second welding power supply to synchronously move according to a preset path to perform additive manufacturing, and continuously introducing the protective gas after the additive manufacturing is finished until a molten pool is cooled to be not higher than 200 ℃, wherein the double-hole wire feeding conductive nozzle, the first welding power supply and the second welding power supply integrally rise to a preset height after being reset;

and 7: repeat step 6 above.

5. The additive processing method for heterogeneous intermetallic compounds according to claim 4, characterized in that the wire feeding material of the first wire feeder is titanium wire, the wire feeding material of the second wire feeder is aluminum wire, and the wire feeding material of the first wire feeder is located above the wire feeding material of the second wire feeder.

6. The dissimilar intermetallic compound additive processing method according to any one of claims 4 to 5, wherein the first welding power source is a laser or a TIG arc heat source and the second welding power source is a TIG arc heat source.

7. The additive machining method for the heterogeneous intermetallic compound according to claim 6, wherein the laser power of the first welding power supply is controlled to be 1000 to 2500W, the current of a TIG arc power supply of the first welding power supply is controlled to be 80 to 150A, the welding current of a TIG welding gun of the second welding power supply is controlled to be 60 to 100A, the welding speed of the welding power supply is controlled to be 0.1 to 0.5m/min, and the extension length of a welding wire is 3 to 6mm.

8. The additive machining method for the heterogeneous intermetallic compound according to any one of claims 4 to 5, wherein the wire feeding speed of the first wire feeder is controlled to be 0.3 to 0.9m/min, and the wire feeding speed of the second wire feeder is controlled to be 0.3 to 0.6m/min.