CN103624259B - Based on metal parts laser deposition restorative procedure and the device of the regulation and control of preset gradient temperature field - Google Patents
Based on metal parts laser deposition restorative procedure and the device of the regulation and control of preset gradient temperature field Download PDFInfo
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- CN103624259B CN103624259B CN201310665362.8A CN201310665362A CN103624259B CN 103624259 B CN103624259 B CN 103624259B CN 201310665362 A CN201310665362 A CN 201310665362A CN 103624259 B CN103624259 B CN 103624259B
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Abstract
Based on metal parts laser deposition restorative procedure and the device of the regulation and control of preset gradient temperature field, adopt induction heating apparatus closely to repair district to base material and add thermosetting high-temperature region, firing rate is fast, heating temperature range is large, thermal source is uniform and stable; Adopt multi-pipeline protective gas wind cooling, easy for installation, simple to operate, good stability; Protective gas adopts high-purity argon gas, and to reparation, district forms inert gas shielding atmosphere, prevents high-temperature oxydation during titanium alloy etc materials laser repairing; Adopt high-temperature flexible holder, simple installation, not yielding, ensure that in the pre-heat deposition repair process of base material, clamping is stable, safe and reliable; Adopt thermal infrared imager successively or given layer detect deposition repair layer temperature, in good time adjustment induction heater heating power, realize the regulation and control that base material closely repairs district's temperature and preset temperature gradient, the laser deposition reparation of disfiguring workpiece is completed after the match at gradient temperature, the thermograde of repairing inside workpiece can be reduced, reduce inside workpiece stress raisers, suppress workpiece deformation cracking.
Description
Technical field: the restorative procedure and the device that the present invention relates to a kind of metal parts, especially a kind of metal parts laser deposition restorative procedure based on the regulation and control of preset gradient temperature field and device.
Background technology: metal parts laser deposition recovery technique refers to: take laser as thermal source, take metal dust as raw material, based on the rapid prototyping principle manufactured that is layering, realize successively melting accumulation according to the scanning pattern of planning to the metal powder material of coaxial conveying by laser, repair the technology with the metal function part of 3D shape, be also referred to as Laser forming repair technology etc.; Technological process carrys out direct forming and manufactures the technology of metal function part and be called as laser deposition molding technology according to this, is also referred to as Laser Rapid Prototyping Technique; Metal parts laser deposition manufacturing technology can be referred to as.Because it has the feature of heat input energy-controllable and flexibility manufacture, make this technology be particularly suitable for precision, labyrinth the precious metal material parts such as titanium alloy, high temperature alloy reparation and directly manufacture, effectively can shorten new product development cycle, reduce development cost and development risk, receive the concern of domestic and international researcher and relevant manufactures in recent years gradually, and obtain Preliminary Applications in the reparation of aero titanium alloy parts and figuration manufacture field; Estimate within a period in future, the laser deposition manufacturing technology of metal parts will obtain develop rapidly and extensive use.
In metal parts laser deposition Study on manufacturing technology and through engineering approaches application, the workpiece deformation problem of Cracking in laser deposition manufacture process is that laser deposition manufacturing technology shapes up and the major obstacle of expansive approach; Particularly in metal parts laser repairing application, because workpiece to be repaired has been in mechanical machining phase or even finishing stage or the part of being on active service, allowance is little or do not have allowance, to prevent workpiece from ftractureing during reparation, workpiece deformation can not be there is, even if because very little deflection also will destroy the integrality of Workpiece structure; How to prevent the workpiece deformation laser repairing technology especially that ftractures from realizing of expansive approach key issue urgently to be resolved hurrily.Reason comprises many-sided many factors such as material, equipment, technique to cause this problem to occur, but its main cause is laser beam local heat, and deposition workpiece different parts heat transfer is different with radiation condition, cause Forming Workpiece local temperature Accumulation Phenomenon obviously different, cause the field distribution of Forming Workpiece internal temperature uneven, local produces stress concentration phenomenon, and then causes Forming Workpiece strain cracking.
Summary of the invention: for the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of metal parts laser deposition restorative procedure based on the regulation and control of preset gradient temperature field and device.
For achieving the above object, the technical solution used in the present invention is: based on the metal parts laser deposition prosthetic device of preset gradient temperature field regulation and control, comprise laser coaxial powder feeding head, flexible fixture, induction heater, cooling tube, workbench, thermal imaging system and induction heating apparatus.Flexible fixture is fixing on the table.Cooling tube is in the centre of flexible fixture, and is in workpiece lower end.Induction heater is in the periphery of cooling tube, and is fixed on disfiguring workpiece lower end.Laser coaxial powder feeding head and thermal imaging system are arranged on the top of disfiguring workpiece.Induction heater is connected with induction heating apparatus.
Based on the metal parts laser deposition restorative procedure of preset gradient temperature field regulation and control, its specific implementation step is as follows:
(1) restoring area of disfiguring workpiece is machined into the shapes such as the circle of regularization or rectangle, according to the induction heater repairing district's size design and manufacture correspondingly-sized, and is connected with induction heating apparatus.
(2) adopt flexible fixture to clamp disfiguring workpiece, fixture is repaired district at the lower surface of clamped base material and is closely repaired district and reserves additional space, guarantees that induction heater and cooling tube can be arranged on relevant position and realize high-temperature heating and sub-cooled.
(3) induction heater is positioned at corresponding lower surface place of nearly reparation district, form high-temperature district in nearly district of repairing, induction heating apparatus and disfiguring workpiece are with workbench movement jointly; Cooling tube is accessed below fixture and is fixed on base material and repair below district's correspondence, pass into inert protective gas quenching, below reparation district, form cooling zone.
(4) preset temperature distribution carries out laser deposition: before laser deposition reparation, by induction heater, base material is closely repaired district's preheating, preheat temperature can be regulated and controled by heater power output, below reparation district correspondence, adopt inert protective gas cooling tube to blow cooling, gas temperature is the temperature that liquid state turns gaseous state, can adjust gas flow according to actual conditions controls below room temperature by reparation district temperature, forms low temperature district; In laser deposition process by thermal infrared imager successively or which floor detects deposition repair layer temperature at interval, in good time adjustment induction heater heating power, complete the regulation and control that base material closely repairs district's temperature and preset temperature gradient, realize the laser deposition reparation of disfiguring workpiece with this understanding.
Tool of the present invention has the following advantages:
(1) adopt induction heating apparatus closely to repair district to base material and add thermosetting high-temperature region, firing rate is fast, heating temperature range is large, thermal source is uniform and stable; Induction heater and eddy-current heating source adopt and removably connect, and induction heater specification can manufacture and design according to reparation district geomery, and manufacturing process is simple, economical and practical, adapts to repair the changeable feature of district's geomery.
(2) multi-pipeline protective gas wind cooling is adopted, easy for installation, simple to operate, good stability; Protective gas adopts high-purity argon gas, and to reparation, district forms inert gas shielding atmosphere, prevents high-temperature oxydation during titanium alloy etc materials laser repairing.
(3) high-temperature flexible holder is adopted, simple installation, not yielding, ensure that in the pre-heat deposition repair process of base material, clamping is stable, safe and reliable.
(4) adopt thermal infrared imager successively or given layer detect deposition repair layer temperature, in good time adjustment induction heater heating power, realize the regulation and control that base material closely repairs district's temperature and preset temperature gradient, the laser deposition reparation of disfiguring workpiece is completed after the match at gradient temperature, the thermograde of repairing inside workpiece can be reduced, reduce inside workpiece stress raisers, suppress workpiece deformation cracking.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the metal parts laser deposition prosthetic device based on the regulation and control of preset gradient temperature field.
Fig. 2 is the structural representation repairing district.
Fig. 3 is square induction heater and induction heating apparatus connection diagram.
Fig. 4 is circular induction heater and induction heating apparatus connection diagram.
Detailed description of the invention:
As shown in Figure 1: based on the metal parts laser deposition prosthetic device of preset gradient temperature field regulation and control, comprise laser coaxial powder feeding head 1, flexible fixture 4, induction heater 5, cooling tube 6, workbench 7, thermal imaging system 8 and induction heating apparatus 9.Flexible fixture 4 is fixing on the table 7.Cooling tube 6 is in the centre of flexible fixture 4.Induction heater 5 is in the periphery of cooling tube 6, and is fixed on disfiguring workpiece 3 lower end.Laser coaxial powder feeding head 1 and thermal imaging system 8 are arranged on the top of disfiguring workpiece 3.Induction heater 5 is connected with induction heating apparatus 9.
As shown in Figure 2: based on the metal parts laser deposition restorative procedure of preset gradient temperature field regulation and control, its specific implementation step is as follows:
(1) district's shape is repaired varied, first the reparation district 2 of disfiguring workpiece 3 is machined into the shape such as circle or rectangle of regularization, according to the induction heater 5 repairing district 2 size design manufacture correspondingly-sized, induction heater 5 is positioned at the corresponding lower surface in nearly reparation district 10, and induction heating apparatus 5 and disfiguring workpiece 3 are with workbench 7 movement jointly.
(2) effectively clamp for the flexible fixture that substrate sizes profile design manufacturing dimension to be repaired is adjustable, prevent from repairing workpiece deformation.Flexible fixture 4 is adopted effectively to clamp disfiguring workpiece 3, fixture is repaired district 2 at the lower surface of clamped base material and is closely repaired district 10 and reserves additional space, guarantees that induction heater 5 and cooling tube 6 can be arranged on relevant position and realize high-temperature heating and sub-cooled.
(3) induction heater 5 is positioned at nearly reparation corresponding lower surface place of district 10, form high-temperature district in nearly district 10 of repairing, induction heating apparatus and disfiguring workpiece 3 are with workbench 7 movement jointly; Cooling tube 6 will be entered access below flexible fixture 4 and be fixed on corresponding below, base material reparation district 2, and pass into inert protective gas quenching, below reparation district 2, form cooling zone 11.
(4) preset temperature distribution carries out laser deposition manufacture
Before laser deposition reparation, by induction heater 5, base material is closely repaired district 10 preheating; preheat temperature controllable is between 100-700 DEG C; adopt inert protective gas cooling tube 6 to blow cooling in corresponding below, reparation district 2, its temperature adjustable is between 0-20 DEG C.In laser deposition process by thermal infrared imager 8 successively (or interval which floor) detect deposition repair layer temperature, in good time adjustment induction heating apparatus 9 heating power, complete the regulation and control that base material closely repairs district 10 temperature and preset temperature gradient, realize the laser deposition reparation of disfiguring workpiece 3 with this understanding, the thermograde of repairing inside workpiece can be reduced, reduce inside workpiece stress raisers, suppress workpiece deformation cracking.
As shown in Figure 3 and Figure 4, according to different reparation district shapes, manufacture and design the induction heater 5 of correspondingly-sized, shape is square, circular etc.
Claims (4)
1., based on the metal parts laser deposition prosthetic device of preset gradient temperature field regulation and control, it is characterized in that: comprise laser coaxial powder feeding head, flexible fixture, induction heater, cooling tube, workbench, thermal imaging system and induction heating apparatus; Flexible fixture is fixing on the table, cooling tube is in the centre of flexible fixture, and be in workpiece lower end, induction heater is in the periphery of cooling tube, and being fixed on disfiguring workpiece lower end, laser coaxial powder feeding head and thermal imaging system are arranged on the top of disfiguring workpiece, and induction heater is connected with induction heating apparatus, induction heater is positioned at corresponding lower surface place of nearly reparation district, and cooling tube is fixed on disfiguring workpiece and repairs below district's correspondence.
2., based on the metal parts laser deposition restorative procedure of preset gradient temperature field regulation and control, its specific implementation step is as follows:
(1) restoring area of disfiguring workpiece is machined into circle or the rectangular shape of regularization, according to the induction heater repairing district's size design manufacture correspondingly-sized, and is connected with induction heating apparatus;
(2) adopt flexible fixture to clamp disfiguring workpiece, fixture is repaired district at the lower surface of clamped disfiguring workpiece and is closely repaired district and reserves additional space, guarantees that induction heater and cooling tube can be arranged on relevant position and realize high-temperature heating and sub-cooled;
(3) induction heater is positioned at corresponding lower surface place of nearly reparation district, form high-temperature district in nearly district of repairing, induction heating apparatus and disfiguring workpiece are with workbench movement jointly; Cooling tube is accessed below fixture and is fixed on base material and repair below district's correspondence, pass into inert protective gas quenching, below reparation district, form cooling zone;
(4) preset temperature distribution carries out laser deposition: before laser deposition reparation, by induction heater, base material is closely repaired district's preheating, preheat temperature is regulated and controled by induction heating apparatus power output, below reparation district correspondence, adopt cooling tube to pass into inert protective gas blow cooling, gas temperature is the temperature that liquid state turns gaseous state, reparation district temperature controls below room temperature by adjustment gas flow, forms low temperature district; In laser deposition process by thermal infrared imager successively or which floor detects deposition repair layer temperature at interval, in good time adjustment induction heater heating power, complete the regulation and control that base material closely repairs district's temperature and preset temperature gradient, realize the laser deposition reparation of disfiguring workpiece with this understanding.
3. as claimed in claim 2 based on the metal parts laser deposition restorative procedure of preset gradient temperature field regulation and control, it is characterized in that: described preheat temperature regulation and control are between 100-700 DEG C.
4., as claimed in claim 2 based on the metal parts laser deposition restorative procedure of preset gradient temperature field regulation and control, it is characterized in that: described its temperature adjusting of low temperature district is between 0-20 DEG C.
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