CN112548482A

CN112548482A - TC4 titanium alloy structure in-situ growth repair process based on micro-arc additive manufacturing and tool kit

Info

Publication number: CN112548482A
Application number: CN202011175222.9A
Authority: CN
Inventors: 董俊; 卿华; 韩亮; 董马虎; 白伟成; 肖瑶; 张献逢; 杨后川
Original assignee: Air Force Engineering University of PLA
Current assignee: Air Force Engineering University of PLA
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-03-26

Abstract

The invention discloses an in-situ growth repair process of a TC4 titanium alloy structure based on micro-arc additive and a tool box, wherein related tools used for in-situ growth repair of the TC4 titanium alloy structure are placed in a box body convenient to move, when a structure at a certain position of an airplane needs to be repaired, the tool box is directly carried to a repair site, the box body is opened, a maintenance tool is taken out, after the position to be repaired is pretreated, deposition is carried out through an arc additive manufacturing machine according to a certain operation method, finally welding beads are polished and leveled, the repair operation is completed, the operation is convenient and rapid, the working efficiency is improved, and the extension of the repair time caused by forgetting the maintenance tool by personnel is prevented.

Description

TC4 titanium alloy structure in-situ growth repair process based on micro-arc additive manufacturing and tool kit

The technical field is as follows:

the invention relates to the field of alloy repair, in particular to an in-situ growth repair process and a tool kit for a TC4 titanium alloy structure based on micro-arc additive manufacturing.

Background art:

the novel airplane mainly considers the design concept of improving the thrust-weight ratio, and a plurality of new technologies and new materials are rapidly developed; the titanium alloy material is widely applied to the manufacturing field of metal components in the aviation industry by virtue of the excellent characteristic of high specific strength; the mass use of the titanium alloy components greatly improves the thrust-weight ratio of the novel airplane, but the conditions required by the titanium alloy components in the aspect of processing are more severe compared with the traditional metal components; the requirement on the precision of the large titanium alloy component is quite strict in the whole numerical control machining process, but due to some uncontrollable factors, small errors occasionally occur in the numerical control machining process of the titanium alloy component, so that defects are generated, and the whole titanium alloy component is scrapped; the original repairing method mainly adopts a mechanical connection reinforcement measure, so that the defects of some special space structures cannot be completely repaired while great cost is paid; since titanium alloy components are expensive to manufacture, the scrapping of such large components often results in tens of millions of losses, and the development of a new repair method is becoming urgent.

The invention content is as follows:

the technical problem to be solved by the invention is as follows: the technology overcomes the defects of the prior art, carries the repairing tool by a portable tool box, pretreats the part to be repaired by the repairing tool, deposits the part by an arc additive manufacturing machine according to a certain operation method, and finally polishes and smoothes a weld bead to finish the repair operation, and is the TC4 titanium alloy structure in-situ growth repair technology and the tool box based on micro-arc additive.

The technical scheme of the invention is as follows: the utility model provides a TC4 titanium alloy structure normal position increases repair technology based on micro-arc vibration material disk, treats the position of restoreing and carries out the cladding through arc vibration material disk machine and according to certain operating method after, polishes the welding bead and levels at last, accomplishes the restoration operation, and its concrete step is:

s1, preprocessing a part to be repaired, a welding wire and a tungsten electrode before deposition;

s2, mounting a tungsten electrode on the working gun, opening the arc additive manufacturing machine, and adjusting corresponding parameters;

s3, the working gun is operated by a single hand, the gun body is held by one hand to keep the working electrode and the welding wire at 80-90 degrees, the distance between the tungsten electrode tip and the welding wire is 0.5-1.5 mm, the other hand is used for feeding the wire, the switch of the working gun is controlled by a pedal, the working gun is supported by the right hand to enable the electrode to move along a certain direction according to the surface of a workpiece, and a continuous welding bead is formed, wherein the diameter of the welding spot is 1/2-1/3 in each movement;

s4, when welding beads are lapped, each layer of surface should be leveled and trimmed in time, the fusing force is released by beating, and when surfacing, current, voltage and pulse time parameters should be controlled, and a switch is stepped on for 1 second by the arc contracting length;

s5, pressing a start/pause key on the panel, turning off the indicator light, entering a standby state, turning off the main power supply, and turning off the air supply;

and S6, after welding and stress, polishing the welding bead by using a polishing tool.

Further, in the step S1, oil stains and rust on the surface of the workpiece are cleaned, the damaged broken hole is cut into a circular hole or an elliptical hole according to a stress principle, the edge of the hole is polished to be flat by using a polishing tool, polishing dust is cleaned by using a dust collector or air blowing during polishing, and finally the surface is cleaned by using acetone or alcohol, and the surface cannot be touched or blown by using a nozzle after cleaning.

Further, in S1, the tungsten electrode head is ground and trimmed without eccentricity, the blackened or discolored area of the tungsten electrode head is removed, and the electrode head is kept pointed.

Further, in S1, the welding wire is cleaned with acetone or alcohol, and heated and dried.

Further, in S2, pressing the start/pause key on the panel, selecting the Ti button, turning on the indicator light, turning on the flow needle to adjust the argon flow to 8-10L/min, and manually adjusting the current and voltage parameters on the operation panel according to different operation habits.

Further, in S3, before welding, the tungsten electrode is directed toward the workpiece in the opposite direction, and the switch pedal is stepped on to remove air in the pipe.

Further, in S6, the residual stress in the welding bead is removed by hammering the circular welding bead with the diameter less than 30mm and the thickness less than 5 mm.

The utility model provides a TC4 titanium alloy structure normal position increases repair toolbox based on micro-arc vibration material disk, characterized by: including articulated box and the case lid that forms the storage chamber each other, just be provided with fixed hasp between box and the case lid, it is protruding to be provided with the annular on the box, be provided with on the case lid with the protruding cooperation of annular forms the annular groove of waterproof construction, just be provided with the rubber pad in the annular groove, all be provided with the bubble cotton in box and the case lid, and offer the profile modeling groove that is used for fixed hot-blast rifle, pneumatic drill, the nest brill of reaming, polisher, hole saw, tray, scissors, gluey rifle, marker pen, a injecting glue section of thick bamboo, abrasive material box, slide caliper, gluey rifle push rod, steel ruler and cutter on the bubble cotton in the case lid, be provided with the arch as an organic whole structure with it.

Furthermore, the trolley is arranged on one side of the bottom of the box body, the telescopic pull rod is arranged on the other side of the bottom of the box body, and handles are arranged on opposite side walls of the box body.

Further, be provided with the spacing rope that prevents the excessive upset of case lid between box and the case lid, dimple drill, hole saw, tray, a injecting glue section of thick bamboo and cutter are two at least.

The invention has the beneficial effects that:

1. the invention carries the repairing tool by the portable tool box, carries out pretreatment on the part to be repaired by the repairing tool, carries out deposition by an arc additive manufacturing machine according to a certain operation method, and finally polishes and flattens the weld bead to finish the repairing operation,

2. the box body and the box cover are hinged with each other to form the storage cavity, and the storage cavity is fixed by the fixing lock catch arranged between the box body and the box cover, so that the repair tool in the storage cavity is prevented from falling off and being damaged due to accidental opening of the box body and the box cover in use.

3. Foam cotton is arranged in the box body and the box cover, contour grooves for placing various maintenance tools are formed in the foam cotton in the box body, the maintenance tools are fixed, the maintenance tools are prevented from being damaged due to mutual shaking and collision, and bulges are arranged on the foam cotton in the box cover and can abut against the maintenance tools when the box cover is covered, so that the maintenance tools are prevented from shaking in the contour grooves and being abraded.

4. According to the invention, the idler wheels are arranged on one side of the bottom of the box body, the telescopic pull rod is arranged on the other side of the bottom of the box body, the box body can be pulled to move through the idler wheels through the telescopic pull rod, the labor intensity of personnel is reduced, the handles are arranged on the opposite side walls of the box body, the box body can be lifted by one handle, and the box body can be carried by two handles, so that the operation of the personnel is facilitated.

5. According to the invention, the limiting rope for preventing the box cover from being overturned excessively is arranged between the box body and the box cover, after a person opens the box cover through the fixed lock catch, the box cover rotates for a certain angle (inclines backwards) under the action of the limiting rope, so that the cover body is prevented from being collided with the box cover by an excessively large rotation angle, meanwhile, the box body and the box cover are provided with the annular bulge and the annular groove which form the sealing structure, and the rubber pad is arranged in the annular groove, so that the sealing effect is enhanced, and rainwater is prevented from entering.

6. According to the invention, related tools used for in-situ growth and repair of the TC4 titanium alloy structure are placed in the box body convenient to move, and when a structure at a certain position of an airplane needs to be repaired, the tool box can be directly carried to a repair site for repair, so that the working efficiency is improved, and the problem that the repair time is prolonged because personnel forget the repair tools is solved.

Description of the drawings:

FIG. 1 is a first structural schematic diagram of a micro-arc additive based TC4 titanium alloy structure in-situ growth repair tool box.

FIG. 2 is a structural schematic diagram II of a micro-arc additive based TC4 titanium alloy structure in-situ growth repair tool box.

Fig. 3 is a schematic structural view of the tool box with the box cover opened.

Fig. 4 is a schematic structural diagram of foam in the box body.

Fig. 5 is a list of the placement of service tools in the contoured grooves on the foam in the tool box.

FIG. 6 is a micro-arc deposition parameter table of TC4 titanium alloy.

The specific implementation mode is as follows:

example (b): see fig. 1, 2, 3 and 4; in the figure, 41-box body, 42-box cover, 43-fixed lock catch, 44-annular bulge, 45-contour groove, 46-annular groove, 47-foam, 48-bulge, 49-roller, 50-telescopic pull rod, 51-handle and 52-limiting rope.

The TC4 titanium alloy structure in-situ growth repair process and the tool box based on micro-arc additive manufacturing are characterized in that related tools used for TC4 titanium alloy structure in-situ growth repair are placed in a box body convenient to move, when a structure at a certain position of an airplane needs to be repaired, the tool box is directly carried to a repair site, the box body is opened and a maintenance tool is taken out, after a part to be repaired is pretreated, deposition is carried out through an arc additive manufacturing machine according to a certain operation method, finally, welding beads are polished to be smooth, repair operation is completed, operation is convenient and fast, working efficiency is improved, and the problem that maintenance time is prolonged because personnel forget the maintenance tool is solved.

The present application will be described in detail below with reference to the drawings and examples.

The utility model provides a TC4 titanium alloy structure normal position increases repair toolbox based on micro arc vibration material disk, including box 41 and case lid 42 that articulated each other forms the storage chamber, and be provided with fixed hasp 43 between box 41 and the case lid 42, be provided with annular bulge 44 on the box 41, be provided with the annular groove 46 that forms waterproof construction with the cooperation of annular bulge 44 on the case lid 42, and be provided with the rubber pad in the annular groove 46, all be provided with bubble cotton 47 in box 41 and the case lid 42, and offer on the bubble cotton 47 in the box 41 and be used for fixed hot-blast rifle, the air drill, the countersink drill, the polisher, the hole saw, the tray, the scissors, the glue gun, the marker pen, the injecting glue section of thick bamboo, the abrasive material box, slide caliper, the glue gun push rod, the imitative groove 45 of straightedge and cutter, be provided with it arch 48 as an organic whole structure with it.

The roller 49 is arranged on one side of the bottom of the box 41, the telescopic pull rod 50 is arranged on the other side of the bottom of the box 41, and the handles 51 are arranged on the opposite side walls of the box 41.

Be provided with between box 41 and the case lid 42 and prevent the spacing rope 52 of the excessive upset of case lid 42, dimple drill, hole saw, tray, a injecting glue section of thick bamboo and cutter are two at least.

A list of the inspection tools placed in the profile groove on the foam in the tool box is shown in table 1.

TABLE 1

Through the tools stored in the tool box and the arc additive manufacturing machine, the damaged part of the TC4 titanium alloy structure is subjected to in-situ growth repair, and the specific repair steps are as follows:

and S1, preprocessing the part to be repaired, the welding wire and the tungsten electrode before deposition.

Cleaning oil stains and rust on the surface of a workpiece, cutting the damaged broken hole into a circular hole or an elliptical hole according to a stress principle, polishing the edge of the hole to be flat by using a polishing tool, cleaning polishing dust by using a dust collector or air blowing in the polishing process, and finally cleaning by using acetone or alcohol, wherein the surface cannot be touched or blown by using a mouth after cleaning.

Grinding and trimming the tungsten electrode head, wherein the grinding is not eccentric, the blackened or discolored area of the tungsten electrode head is removed, and the electrode head is kept to be a sharp head.

The welding wire is cleaned by acetone or alcohol and heated and dried.

And S2, mounting a tungsten electrode on the working gun, opening the arc additive manufacturing machine, and adjusting corresponding parameters.

Pressing a start/pause key on the panel, selecting a Ti key, turning on an indicator light, turning on a flow needle to adjust the argon flow to 8-10L/min, and manually adjusting current and voltage parameters on an operation panel according to different operation habits, which is specifically shown in Table 2.

TABLE 2 TC4 micro-arc deposition parameters of titanium alloy

	Specification of	Remarks for note
			Deposited base material	TC4
Thickness of the substrate	0.8-10mm
			Mode selection	Ti	Front panel
Electrode for electrochemical cell	Tungsten electrode	2.4 mm
			Welding wire	TC4, AWS Standard	0.8-1.2mm
Protective gas	Argon gas	High purity argon

S3, the working gun is operated by a single hand, the gun body is held by one hand to keep the working electrode and the welding wire at 80-90 degrees, the distance between the tungsten electrode tip and the welding wire is 0.5-1.5 mm, the wire feeding is carried out by the other hand, the switch of the working gun is controlled by a foot pedal, the working gun is supported by the right hand to enable the electrode to move along a certain direction according to the surface of a workpiece, and a continuous welding path is formed, wherein the diameter of a welding spot is 1/2-1/3 in each movement.

Before welding, the tungsten electrode is directed to the workpiece in the reverse direction, and the switch pedal is stepped to remove air in the pipeline.

And S4, when the weld bead is lapped, leveling and finishing each layer of surface in time, knocking to release the fusing force, and when surfacing, controlling current, voltage and pulse time parameters, and stepping on a 1-second switch for the arc-retracting length.

S5, pressing the start/pause key on the panel, turning off the indicator light, entering the standby state, turning off the main power supply, and turning off the air supply.

And removing residual stress in the welding bead by adopting a hammering method for the circular welding bead with the diameter less than 30mm and the thickness less than 5 mm.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An in-situ growth repair process of TC4 titanium alloy structure based on micro-arc additive. After pretreatment of the part to be repaired, the arc additive manufacturing machine is used to deposit according to a certain operation method, and finally the weld bead is ground. Flatten and complete the repair operation. The specific steps are:

S1. Pretreatment of the parts to be repaired, welding wire and tungsten electrode before deposition;

S2. Install the tungsten electrode on the working gun, open the arc additive manufacturing machine, and adjust the corresponding parameters;

S3. The working gun is operated with one hand, hold the gun body with one hand to keep the working electrode and the welding wire at 80°-90°, the distance between the tungsten electrode tip and the welding wire is 0.5 mm -1.5 mm, and the other hand is used to feed the wire, and use the foot pedal Control the switch, hold the working gun with the right hand, and make the electrode move in a certain direction according to the surface of the workpiece to form a continuous weld bead, where each movement is 1/2-1/3 of the diameter of the weld spot;

S4. When the welding bead is overlapped, the surface of each layer should be leveled and trimmed in time, and the fusing force should be released by tapping. When surfacing, the parameters of current, voltage and pulse time should be controlled, and the arc closing length should be pressed for 1 second;

S5. Press the start/pause button on the panel, the indicator light is off, enter the standby state, turn off the main power supply, and turn off the gas source;

S6. After the welding is completed and the stress is applied, the weld bead is ground and leveled with a grinding tool.

2. the TC4 titanium alloy structure in-situ growth repair process based on micro-arc additive according to claim 1, it is characterized in that: in the described S1, clean the oil stain and rust on the workpiece surface, and according to the stress principle, damage the Cut the hole into a round hole or an oval hole. Use a grinding tool to smooth the edge of the hole. During the grinding process, use a vacuum cleaner or air blower to clean the grinding dust, and finally clean it with acetone or alcohol. After cleaning, the surface should not be touched or blown with your mouth.

3. The in-situ growth and repair process of TC4 titanium alloy structure based on micro-arc additive according to claim 1, characterized in that: in the S1, the tungsten electrode head is ground and trimmed, the grinding is not eccentric, and the tungsten is removed. Blackened or discolored areas on the electrode head, and the electrode head should be kept pointed.

4. The in-situ growth and repair process of TC4 titanium alloy structure based on micro-arc additive according to claim 1, characterized in that: in the S1, the welding wire is cleaned with acetone or alcohol, and heated and dried.

5. the TC4 titanium alloy structure in-situ growth repair process based on micro-arc additive according to claim 1, it is characterized in that: in described S2, press the start/pause key on the panel, select the Ti key, the indicator light is on, Open the flow needle to adjust the argon flow to 8-10L/min. According to different operating habits, manually adjust the current and voltage parameters on the operation panel.

6. The in-situ growth repair process of TC4 titanium alloy structure based on micro-arc additive material according to claim 1, it is characterized in that: in described S3, before welding, point the tungsten pole to the workpiece in the opposite direction, and step on the switch pedal when the pipeline is empty. Internal air removal.

7. The in-situ growth repair process of TC4 titanium alloy structure based on micro-arc additive material according to claim 1, characterized in that: in the S6, hammering is used for the circular weld bead with a diameter less than 30mm and a thickness of less than 5mm method to remove residual stress in the weld bead.

8. A toolbox for in-situ growth and repair of TC4 titanium alloy structures based on micro-arc additive, characterized in that it comprises a box body and a box cover that are hinged to each other to form a storage cavity, and a box body and a box cover are provided between the box body and the box cover. The lock is fixed, the box body is provided with an annular protrusion, the box cover is provided with an annular groove that cooperates with the annular protrusion to form a waterproof structure, and a rubber pad is arranged in the annular groove, so Both the box body and the box cover are provided with foam, and the foam in the box is provided with a hot air gun, air drill, countersink drill, grinder, hole saw, tray, scissors, glue gun, marker, Glue injection cylinder, abrasive box, vernier caliper, glue gun push rod, steel ruler and tool copy groove, and the foam inside the box cover is provided with a protrusion with an integral structure.

9. The toolbox for in-situ growth and repair of TC4 titanium alloy structure based on micro-arc additive according to claim 1, characterized in that: one side of the bottom of the box is provided with a roller, and the other side of the bottom of the box is provided with a telescopic A pull rod is provided, and handles are provided on the opposite side walls of the box body.

10. The in-situ growth and repair toolbox of TC4 titanium alloy structure based on micro-arc additive according to claim 1, characterized in that: a limit rope for preventing the overturning of the box cover is provided between the box body and the box cover , there are at least two countersink drills, hole saws, trays, glue injection cylinders and cutters.