A brazing filler metal injection tooling, method and brazing method for a turbine rotor blade assembly

Abstract

The present invention discloses a brazing filler metal injection tooling, method and brazing method for a turbine rotor blade assembly, including a positioning plate member, the positioning plate member is arranged in parallel with a fixing plate member, and a supporting plate member is vertically arranged between the positioning plate member and the fixing plate member; a plurality of positioning through grooves are formed in the positioning plate member, the shape of the positioning through grooves matches the crown profile of the blade body, and one end of the positioning through grooves communicates with the edge of the positioning plate member; a retaining strip is arranged between the positioning plate member and the fixing plate member, one side portion of the retaining strip is perpendicularly fixed to the side surface of the supporting plate member, and a plurality of fixing notches are uniformly formed in the other side portion; the plurality of fixing notches are arranged corresponding to the positioning through grooves up and down, and the shape of the fixing notches matches the exhaust edge profile of the blade body; the present invention uses the positioning plate member to support the crown of the blade body and utilizes the supporting effect of the retaining strip to make the position to be welded of the cover plate in a horizontal state, ensuring the consistency of brazing filler metal injection, and further ensuring the stable, efficient and reliable execution of automatic injection.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, relates to the vacuum brazing technology of a turbine rotor blade body and a cover plate, and particularly relates to a brazing filler metal application tooling, a method and a brazing method for a turbine rotor blade assembly. Background Art

[0002] During the manufacturing process of a high-pressure turbine rotor blade assembly of a certain aeroengine, the blade body 1 and the cover plate 2 are welded and fixed by a vacuum brazing process, as shown in the appendix Figure 1-2 ; Since the blade body 1 is a casting and the cover plate 2 is a sheet metal stamping part, there are large dimensional tolerances between the two, and it is difficult to strictly ensure the consistency of the assembly and positioning of the cover plate 2 and the blade body 1; Secondly, there are core holes generated by casting on the blade body 1 near the intake edge, near the exhaust edge and in the middle part of the blade; And two preset holes are provided on the cover plate 2; During the vacuum brazing process, the cover plate 2 must cover the core holes in the middle part of the blade, and the brazing filler metal is not allowed to block the core holes of the blade body 1 and the cover plate 2; Therefore, during the vacuum brazing process of the cover plate 2, the control of the amount of brazing filler metal is particularly important; When the amount of brazing filler metal is too much, the brazing filler metal in the narrow space is extremely easy to overflow and spread into the core holes of the blade, resulting in the scrapping of parts; When the amount of brazing filler metal is too little, it is not conducive to forming a dense and full brazing seam. After sandblasting corrosion and aluminizing aging in the later stage, weld defects are exposed and cannot be repaired, also resulting in the scrapping of parts.

[0003] At present, the existing vacuum brazing process has long relied on manual operation; Specifically, first, the powdered brazing filler metal is mixed with a binder according to the designed ratio to form a paste-like brazing filler metal, and then the prepared paste-like brazing filler metal is poured into a medical nylon syringe; Then, hold the syringe by hand and rely on the strength of the hand to push the piston in the syringe to extrude the brazing filler metal; The force of the operator squeezing the brazing filler metal by hand and the speed of controlling the movement of the syringe together determine the amount of brazing filler metal extruded; Among them, the extrusion force and the injection speed are adjusted by the operator according to his own processing experience, and it is difficult to accurately control the amount of brazing filler metal, and the application consistency and repeatability of the brazing filler metal are poor; On the other hand, in terms of processing efficiency, relying on traditional manual application of brazing filler metal has a very low efficiency and can no longer meet the production requirements of large quantities of parts. Summary of the Invention

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a brazing filler metal application tooling, a method and a brazing method for a turbine rotor blade assembly to solve the technical problems that in the existing vacuum brazing process of the cover plate, it is difficult to accurately control the amount of brazing filler metal, the application consistency and repeatability of the brazing filler metal are poor, and the application efficiency is low.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a brazing material injection tooling, which includes a positioning plate member, a fixing plate member, a support plate member and a retaining bar; the positioning plate member and the fixing plate member are arranged parallel to each other up and down, and the support plate member is vertically arranged between the positioning plate member and the fixing plate member; a plurality of positioning through slots are formed in the positioning plate member, and the plurality of positioning through slots are evenly distributed along the long axis direction of the positioning plate member; wherein, the shape of the positioning through slot matches the crown shape of the blade body, and one end of the positioning through slot communicates with the edge of the positioning plate member.

[0007] The retaining bar is horizontally arranged between the positioning plate member and the fixing plate member, one side portion of the retaining bar is perpendicularly fixed to the side surface of the support plate member, and a plurality of fixing bayonets are evenly formed on the other side portion of the retaining bar; wherein, the plurality of fixing bayonets are arranged corresponding to the positioning through slots up and down, and the shape of the fixing bayonet matches the exhaust edge shape of the blade body.

[0008] Further, the positioning plate member is of a rectangular plate member structure, and the long axis direction of the positioning plate member is parallel to the horizontal running direction of the automatic brazing material injector; the positioning through slot is a parallelogram through slot, one corner portion of the parallelogram through slot communicates with the edge of the long side portion of the positioning plate member, and the communication position is arranged on the side away from the support plate member.

[0009] Further, the fixing plate member is horizontally fixed on the equipment working platform of the automatic brazing material injector, and the fixing plate member and the equipment working platform are fixed by bolts; wherein, a plurality of oblong bolt holes are evenly arranged on the fixing plate member, one end of the bolt penetrates and is fixed in the oblong bolt hole, and the other end is fixed on the equipment working platform.

[0010] The present invention also provides a brazing material injection method, which includes:

[0011] Assembling the blade body equipped with a cover plate into the above-mentioned brazing material injection tooling; wherein, placing the crown of the blade body in the positioning through slot to support it by the side wall of the positioning through slot; placing the blade body of the blade in the fixing bayonet so that the exhaust edge of the blade body is in close contact with the side wall of the fixing bayonet.

[0012] Installing the brazing material injection tooling on the equipment working platform of the automatic brazing material injector.

[0013] According to the process operation requirements, preparing the brazing material and adding the prepared brazing material into the automatic brazing material injector.

[0014] Using a CCD camera to obtain an image of the position to be welded between the blade body and the cover plate, and adopting the method of inserting points and drawing lines to fit out the geometric contour of the brazing seam to be welded between the blade body and the cover plate, completing the programming of the brazing material injection path, and obtaining the injection path of the brazing material.

[0015] Start the solder automatic injection machine, so that the solder automatic injection machine operates according to the injection path of the solder and the preset solder injection process parameters. After the solder injection is completed, take out the part to obtain the part to be welded with the solder injected; thus, the solder injection for the position to be welded between the blade body and the cover plate is completed.

[0016] Further, the preset solder injection process parameters include the injection air pressure of the solder and the injection speed of the solder.

[0017] Further, the injection air pressure of the solder is 140 KPa, and the injection speed of the solder is 8 mm / ms.

[0018] The present invention also provides a brazing method for a turbine rotor blade assembly, including the following steps:

[0019] Apply a flow blocker at the core hole of the blade body to obtain a blade body coated with the flow blocker;

[0020] Based on the method of six-point energy storage spot welding, position the cover plate on the blade body to obtain a blade body assembled with the cover plate;

[0021] Use the above-mentioned solder injection method to inject solder at the position to be welded between the blade body and the cover plate to obtain a part to be welded with the solder injected;

[0022] Perform vacuum brazing on the part to be welded with the solder injected, and after surface cleaning, obtain the turbine rotor blade assembly.

[0023] Further, during the process of applying a flow blocker at the core hole of the blade body to obtain a blade body coated with the flow blocker, apply the flow blocker to the core holes at the positions close to the intake edge, close to the exhaust edge, and the middle part of the blade on the blade body; wherein, the flow blocker is prepared by mixing Al2O3 fine powder and a water-based binder.

[0024] Further, in the blade body assembled with the cover plate, a welding gap of 0.02 - 0.08 mm is provided between the blade body and the cover plate.

[0025] Further, during the process of performing vacuum brazing on the part to be welded with the solder injected, place the tenon of the part to be welded facing upwards and the shroud facing downwards and hang it on a graphite or ceramic material bracket to enter the furnace for vacuum brazing.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The present invention provides a brazing filler metal injection tooling and method. The parts to be welded are fixed and positioned by using the brazing filler metal injection tooling, and the automatic injection of the brazing filler metal is carried out by using an automatic brazing filler metal injector. The tooling structure is simple, and it can realize the reliable fixation of the parts to be welded, thereby ensuring the stable, efficient and reliable execution of the automatic injection. Among them, positioning through slots are opened on the positioning plate, and the crowns of the blade bodies are supported by using the positioning through slots; fixing chucks are arranged on the retaining bars, and the exhaust edges of the blade bodies are fitted and clamped in the fixing chucks to realize the supporting effect of the retaining bars on the blade bodies, so as to bear the downward component force of the self-weight of the parts to be welded, so that the position to be welded of the cover plate is in a horizontal state, ensuring the consistency of the brazing filler metal injection; the automatic injection is carried out by using an automatic brazing filler metal injector, which can realize the precise control of the amount of the brazing filler metal, has good repeatability, and effectively improves the injection efficiency.

[0028] Furthermore, the positioning through slots are set as parallelogram through slots to realize the precise positioning of the parts to be welded; one corner of the parallelogram through slot is communicated with the edge of the long side of the positioning plate, which is convenient for the placement and removal of the parts to be welded, and effectively improves the disassembly and assembly efficiency of the parts.

[0029] Furthermore, a CCD camera is used to obtain the image of the position to be welded between the blade body and the cover plate based on the principle of image recognition, and the method of inserting points and drawing lines is adopted to fit the geometric contour of the brazing seam to be welded between the blade body and the cover plate, realizing the automatic correction of the assembly error of the cover plate during the injection of the brazing filler metal. The positioning accuracy is less than 0.025 mm, and the repeat positioning accuracy is less than 0.02 mm.

[0030] The present invention also provides a brazing method for a turbine rotor blade assembly. Before assembling and positioning the cover plate, a flow blocker is applied to the core holes of the blade bodies for protection; the cover plate is positioned by using the six-point energy storage spot welding method, ensuring that the gap between the cover plate and the blade meets the requirements of the brazing process and the relative position between the two will not be displaced during the brazing process; the idea, method and equipment of automatic brazing filler metal injection are introduced, and the injection parameters are debugged by using an automatic brazing filler metal injector, finding the optimal solution of the amount of the powdered brazing filler metal required for the brazing of the cover plate, and the material output can be digitally displayed in real time, and the accuracy is controlled within ±10%.

[0031] Furthermore, the flow blocker is prepared by mixing Al2O3 fine powder and a water-based binder, effectively enhancing the adhesion strength of the flow blocker, and further ensuring the protection effect on the core holes of the blade bodies.

[0032] Furthermore, during vacuum brazing, the parts are put into the furnace with the tenons facing up and the crowns facing down, and the anti-gravity method is used to prevent the brazing filler metal from flowing into the blade core holes under the action of gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a cross-sectional view of a high-pressure turbine rotor blade assembly;

[0034] Figure 2 is Figure 1 An enlarged schematic view in the C direction in

[0035] Figure 3 is the structural schematic diagram of the filler metal injection tooling in Embodiment 1;

[0036] Figure 4 is the schematic diagram of the using state of the filler metal injection tooling in Embodiment 1;

[0037] Figure 5 is the flow chart of the brazing method for the turbine rotor blade assembly described in Embodiment 3.

[0038] Wherein, 1 is the blade body, 2 is the cover plate; 100 is the filler metal injection tooling, 200 is the equipment working platform, 300 is the turbine rotor blade assembly; 101 is the fixed plate member, 102 is the support plate member, 103 is the positioning plate member, 104 is the stop bar. Specific Embodiments

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following specific embodiments are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Embodiment 1

[0041] As shown in the attached Figure 3-4 This Embodiment 1 provides a filler metal injection tooling. The filler metal injection tooling 100 includes a positioning plate member 101, a fixed plate member 102, a support plate member 103 and a stop bar 104; the positioning plate member 101 and the fixed plate member 102 are arranged parallel to each other up and down, and the support plate member 103 is arranged vertically between the positioning plate member 101 and the fixed plate member 102.

[0042] Specifically, both the positioning plate member 101 and the fixed plate member 102 are rectangular plate structures, the long axis directions of the positioning plate member 101 and the fixed plate member 102 are arranged parallel to each other, and are both arranged parallel to the horizontal running direction of the automatic filler metal injection machine; the support plate member 103 is arranged vertically on the long side of the positioning plate member 101 and the fixed plate member 102, the upper end of the support plate member 103 is vertically fixed to the first long side of the positioning plate member 101, and the lower end of the support plate member 103 is vertically fixed to the first long side of the fixed plate member 102; that is, the positioning plate member 101, the fixed plate member 102 and the support plate member 103 are assembled to form a U-shaped bracket structure; during use, the parts to be welded are placed on the opening side of the U-shaped bracket structure.

[0043] In Embodiment 1, a plurality of positioning channels are formed in the positioning plate member 101, and the plurality of positioning through slots are uniformly distributed along the long axis direction of the positioning plate member 101; wherein, the positioning through slots are uniformly arranged on one side close to the second long side portion of the positioning plate member 101; the shape of the positioning through slot matches the crown outer shape of the blade body 1, and one end of the positioning through slot communicates with the edge of the positioning plate member 101; preferably, the positioning through slot is a parallelogram through slot, and a corner of the parallelogram through slot communicates with the edge of the second long side portion of the positioning plate member 101, and the communicating portion is arranged on the side away from the support plate member 103.

[0044] In Embodiment 1, the fixing plate member 102 is horizontally arranged on the equipment working platform 200 of the solder automatic injection machine, and the fixing plate member 102 and the equipment working platform 200 are fixed by bolts; wherein, a plurality of oblong bolt holes are uniformly arranged on the fixing plate member 102, one end of the bolt passes through and is fixed in the oblong bolt hole, and the other end is fixed on the equipment working platform 200; preferably, the solder automatic injection machine adopts a SEC-400BD type solder automatic injection machine.

[0045] In Embodiment 1, the retaining strip 104 is horizontally arranged between the positioning plate member 101 and the fixing plate member 102 and is vertically fixed on the side surface of the support plate member 103; wherein, one side portion of the retaining strip 104 is vertically fixed on the side surface of the support plate member 103, and a plurality of fixing notches are uniformly formed on the other side portion of the retaining strip 104; the plurality of fixing notches are arranged corresponding to the positioning through slots up and down, and the shape of the fixing notch matches the exhaust edge outer shape of the blade body 1.

[0046] In Embodiment 1, the positioning plate member 101, the fixing plate member 102, the support plate member 103 and the retaining strip 104 are all made of bakelite materials, and the plate members are fixed by gluing.

[0047] Working principle:

[0048] For the solder injection tooling described in Embodiment 1, during use, the blade body 1 with the cover plate 2 assembled and positioned is placed into the solder injection tooling 100, and the solder injection tooling 100 is fixed on the equipment working platform 200 of the solder automatic injection machine; specifically, the crown of the blade body 1 is seated in the positioning through slot of the positioning plate member 101, and one side of the exhaust edge of the blade body 1 is fixedly clamped in the fixing notch of the retaining strip 104, so as to use the retaining strip 104 to support the exhaust edge of the blade body 1 and ensure that the position to be welded of the cover plate is in a horizontal state; then, the automatic solder injection machine is started to inject solder at the position to be welded between the blade body 1 and the cover plate 2, and the parts to be welded with solder injected can be obtained.

[0049] For the solder injection tooling described in Embodiment 1, a positioning through groove is provided on the positioning plate member, and the crown of the blade body is supported by using the positioning through groove; a fixed bayonet is provided on the retaining bar, and the blade body of the blade is fitted and clamped in the fixed bayonet, so as to realize the supporting effect of the retaining bar on the blade body, bear the downward component force of the self-weight of the part to be welded, and make the position to be welded of the cover plate in a horizontal state, ensuring the consistency of solder injection; during solder injection, the solder injection tooling 100 is fixed on the equipment working platform 200 of the automatic solder injection machine, and automatic injection is carried out by using the automatic solder injection machine, which can achieve precise control of the solder volume, has good repeatability, and effectively improves the injection efficiency.

[0050] Embodiment 2

[0051] Embodiment 2 provides a solder injection method, which uses the solder injection tooling 100 described in Embodiment 1 above to clamp and fix the blade body 1 assembled with the cover plate 2; wherein, the solder injection method specifically includes the following steps:

[0052] Step 1: Place the blade body 1 assembled with the cover plate 2 into the solder injection tooling 100; wherein, place the crown of the blade body 1 in the positioning through groove to support it by using the side wall of the positioning through groove; place the blade body 1 of the blade in the fixed bayonet so that the exhaust edge of the blade body 1 is in close contact with the side wall of the fixed bayonet; then, install the solder injection tooling 100 on the equipment working platform 200 of the automatic solder injection machine.

[0053] Step 2: According to the process operation requirements, prepare the solder and add the prepared solder into the automatic solder injection machine; wherein, the prepared solder is paste solder, and the paste solder is prepared by mixing powdered HBNi75CrSiBCo solder and a binder according to the designed mass percentage and stirring evenly.

[0054] Step 3: Use a CCD camera to obtain an image of the position to be welded between the blade body 1 and the cover plate 2, and adopt the method of inserting points and drawing lines to fit out the geometric contour of the solder joint to be welded between the blade body 1 and the cover plate 2, complete the programming of the solder injection path, and obtain the solder injection path.

[0055] Step 4: Start the automatic solder injection machine, so that the automatic solder injection machine runs according to the solder injection path and the preset solder injection process parameters until the solder injection is completed, then take out the part to obtain the part to be welded with the solder injected; thus, the solder injection of the position to be welded between the blade body 1 and the cover plate 2 is completed; wherein, the preset solder injection process parameters include the injection air pressure of the solder and the injection speed of the solder; preferably, the injection air pressure of the solder is 140 KPa, and the injection speed of the solder is 8 mm / ms.

[0056] In the second embodiment, a CCD camera is used to obtain an image of the position to be welded between the blade body and the cover plate based on the principle of image recognition, and the geometric contour of the brazing seam to be welded between the blade body and the cover plate is fitted by the method of inserting points and drawing lines, realizing the automatic correction of the assembly error of the cover plate during the brazing filler metal application. The positioning accuracy is less than 0.025 mm, and the repeat positioning accuracy is less than 0.02 mm.

[0057] Embodiment 3

[0058] As shown in the Figure 3-5 accompanying drawings, the third embodiment provides a brazing method for a turbine rotor blade assembly, which specifically includes the following steps:

[0059] Step 1, grinding

[0060] The surfaces of the blade body 1 and the cover plate 2 to be welded are ground clean with fine sandpaper until the surfaces of the parts show a fresh metallic luster and no oxidation color is allowed.

[0061] Step 2, cleaning

[0062] The surfaces of the ground blade body 1 and cover plate 2 are cleaned with acetone and then dried; there is no oil stain or other stain on the surfaces of the parts after cleaning and drying.

[0063] Step 3, assembly

[0064] A flow blocker is applied to the core holes of the blade body 1 to obtain the blade body 1 applied with the flow blocker; among them, the core holes near the inlet edge, near the exhaust edge and in the middle part of the blade of the blade body 1 are applied with the flow blocker, and the flow blocker should not be applied to the surface to be welded of the blade body 1; among them, the flow blocker is prepared by mixing and stirring Al2O3 fine powder and a water-based binder evenly according to a volume ratio of 1:1.

[0065] Based on the method of six-point energy storage electric welding, the cover plate 2 is positioned on the blade body 1 to obtain the blade body 1 assembled with the cover plate 2; among them, a welding gap of 0.02 - 0.08 mm is provided between the blade body 1 and the cover plate 2; when the cover plate 2 is assembled and positioned, it should be ensured that the preset holes on the cover plate 2 are not blocked by the side walls of the core holes of the blade body.

[0066] Step 4, automatic application of paste brazing filler metal

[0067] Using the brazing filler metal application tooling in the first embodiment above, the paste brazing filler metal is automatically applied; the brazing filler metal application process is operated according to the brazing filler metal application method in the second embodiment above; among them, the brazing filler metal application process is specifically as follows:

[0068] Step 41, fixing the fixture

[0069] Fix the fixed plate 102 of the solder application tooling 100 on the equipment working platform 200 of the automatic solder application machine by bolts. Among them, in order to facilitate the picking and placing of parts and considering the equipment working stroke limit, two solder application toolings 100 are fixed on each equipment working platform 200, and the two solder application toolings are arranged in parallel. There are 10 positioning through slots on the positioning plate of each solder application tooling, and 10 fixing buckles are arranged on each retaining bar 104 to meet the fixed positioning of 10 parts to be welded for each solder application tooling.

[0070] Step 42: Place the parts

[0071] Place the blade body 1 assembled with the cover plate 2 into the solder application tooling 100. Among them, place the crown of the blade body 1 into the positioning through slot to support it by the side wall of the positioning through slot; place the blade body 1 of the blade into the fixing buckle so that the exhaust edge of the blade body 1 is in close contact with the side wall of the fixing buckle; use the retaining bar to support the blade body 1 of the blade to bear the component of the self-weight of the part downward, so as to keep the position to be soldered of the cover plate 2 horizontal.

[0072] Step 43: Prepare the paste solder

[0073] Mix the powdered HBNi75CrSiBCo solder and the binder according to the designed mass percentage and stir evenly, then pour it into the special material cylinder of the equipment of the automatic solder application machine and fix it firmly; install the injection needle of the automatic solder application machine and connect the compressed air. It should be noted that by using the test plate weighing test method and combining the size of the space to be soldered of the part, the automatic solder application machine is used for debugging to determine the optimal preparation ratio of the paste solder required for this part.

[0074] Step 44: Image recognition

[0075] Based on the image recognition function, according to the structural characteristics of the part, set the marker point type as "single marker point, take multiple products multiple times", then edit the marker point coordinates to clarify the search object and search area on the part; before searching, set the similarity to 80%, the angle deviation to ±3°, and the setting ratio to 0.036 mm / pixel to correct the correction accuracy of the CCD camera for the search object / area.

[0076] Step 45: Programming of the injection path

[0077] With the image collected by the CCD camera, the geometric contour of the brazing seam to be welded is fitted by interpolating points and drawing lines, and the programming of the paste solder injection path is completed; specifically, the image of the position to be welded between the blade body 1 and the cover plate 2 is obtained by using the CCD camera, and the geometric contour of the brazing seam to be welded between the blade body 1 and the cover plate 2 is fitted by the method of interpolating points and drawing lines, and the programming of the solder injection path is completed to obtain the solder injection path.

[0078] Step 46. Setting of injection process parameters

[0079] Set the injection process parameters for the paste solder injection; among them, the solder injection process parameters include the injection air pressure of the solder and the injection speed of the solder; preferably, the injection air pressure of the solder is 140 KPa, and the injection speed of the solder is 8 mm / ms.

[0080] Step 47. Automatic injection:

[0081] Start the automatic solder injection machine so that the automatic solder injection machine runs according to the solder injection path and the preset solder injection process parameters until the solder injection is completed; specifically, click the start button of the automatic solder injection machine to run the program, and the equipment automatically injects until all the parts on the working platform are injected and then the machine automatically resets.

[0082] Step 48. Taking out parts and repeating injection by running the fixed program

[0083] Take out the parts to be welded with the solder already injected, and then put in the new parts to be injected with the solder; by running the preset running program of the automatic solder injection, all the remaining parts to be processed are injected.

[0084] Step 5. Vacuum brazing

[0085] Perform vacuum brazing on the parts to be welded with the solder injected to obtain the brazed turbine rotor blade assembly; specifically, hang the parts to be welded with the tenon head facing up and the blade crown facing down on a graphite or ceramic material bracket and put them into the furnace for vacuum brazing; among them, the brazing temperature is 1170 °C and the holding time is 55 - 65 min.

[0086] Step 6. Cleaning parts

[0087] Blow off the white flow inhibitor on the surface of the brazed turbine rotor blade assembly with compressed air; if there is solder splash, overflow, or build-up on the part surface, it can be removed by mechanical grinding, and note that the part substrate should not be damaged during grinding.

[0088] Step 7. Inspection:

[0089] Visually inspect the brazing quality of the parts according to the acceptance standard of the vacuum brazing process; then conduct X-ray inspection to check whether the brazing filler metal overflows into the blade core holes; if the inspection is qualified, the turbine rotor blade assembly 300 is obtained.

[0090] In the brazing filler metal application tooling, method and brazing method for the turbine rotor blade assembly of the present invention, before assembling and positioning the cover plate, that is, apply a flow inhibitor in the core holes on the blade body for protection; in order to enhance the adhesion strength of the flow inhibitor, it is prepared by mixing Al2O3 micropowder and a water-based binder; during vacuum brazing, place the parts with the tenons facing up and the crowns facing down into the furnace, and use the anti-gravity method to prevent the brazing filler metal from flowing into the blade core holes under the action of gravity.

[0091] In the present invention, on the basis of avoiding the overflow of the brazing filler metal, in order to ensure the welding quality, the cover plate is positioned by means of six-point energy storage spot welding, ensuring that the gap between the cover plate and the blade body meets the requirements of the brazing process and the relative position between the two will not shift during the brazing process; introduce the idea, method and equipment of automatic brazing filler metal application, debug the application parameters by using an automatic brazing filler metal applicator, obtain the optimal solution of the powder brazing filler metal amount required for brazing the cover plate, and can digitally display the discharge amount in real time, with the accuracy controlled within ±10%; use a CCD camera, based on the principle of image recognition, to realize the automatic correction of the assembly error of the cover plate when applying the brazing filler metal, with the positioning accuracy less than 0.025 mm and the repeated positioning accuracy less than 0.02 mm; develop a special brazing filler metal application tooling, and realize the stable, efficient and reliable execution of automatic application by running a fixed program.

[0092] The brazing filler metal application tooling, method and brazing method for the turbine rotor blade assembly of the present invention realize the precise control of the brazing filler metal amount, ensure the welding quality and prevent the brazing filler metal from overflowing into the blade core holes; while ensuring the welding quality, improve the production efficiency, reduce the production cost, and have great engineering application reference value for the processing and manufacturing of similar parts.

[0093] The above embodiments are only one of the implementation manners that can realize the technical solution of the present invention. The scope of protection required by the present invention is not limited only by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A brazing filler metal injection tooling, characterized in that, The brazing filler metal injection tooling (100) includes a positioning plate member (101), a fixing plate member (102), a support plate member (103) and a stop bar (104); the positioning plate member (101) and the fixing plate member (102) are arranged parallel to each other vertically, and the support plate member (103) is vertically arranged between the positioning plate member (101) and the fixing plate member (102); a plurality of positioning through slots are formed in the positioning plate member (101), and the plurality of positioning through slots are uniformly distributed along the long axis direction of the positioning plate member (101); wherein, the shape of the positioning through slot matches the crown profile of the blade body (1), and one end of the positioning through slot communicates with the edge of the positioning plate member (101). The stop bar (104) is horizontally arranged between the positioning plate member (101) and the fixing plate member (102), one side of the stop bar (104) is perpendicularly fixed to the side surface of the support plate member (103), and a plurality of fixing bayonets are uniformly formed on the other side of the stop bar (104); wherein, the plurality of fixing bayonets are arranged corresponding to the positioning through slots up and down, and the shape of the fixing bayonet matches the exhaust edge profile of the blade body (1).

2. The brazing filler metal injection tooling according to claim 1, characterized in that, The positioning plate member (101) has a rectangular plate member structure, and the long axis direction of the positioning plate member (101) is parallel to the horizontal running direction of the brazing filler metal automatic injection machine; the positioning through slot is a parallelogram through slot, one corner of the parallelogram through slot communicates with the edge of the long side of the positioning plate member (101), and the communication position is arranged on the side away from the support plate member (103).

3. A brazing filler metal injection tooling according to claim 1, characterized in that, The fixing plate member (102) is horizontally fixed on the equipment working platform (200) of the brazing filler metal automatic injection machine, and the fixing plate member (102) and the equipment working platform (200) are fixed by bolts; wherein, a plurality of oblong bolt holes are uniformly arranged on the fixing plate member (102), one end of the bolt passes through and is fixed in the oblong bolt hole, and the other end is fixed on the equipment working platform (200).

4. A method for applying filler metal, characterized in that, Including: Assembling the blade body (1) equipped with the cover plate (2) into the brazing filler metal injection tooling (100) as described in any one of claims 1-3; wherein, placing the crown of the blade body (1) in the positioning through slot to support it by the side wall of the positioning through slot; placing the blade body (1) of the blade in the fixing bayonet so that the exhaust edge of the blade body (1) is in close contact with the side wall of the fixing bayonet. Installing the brazing filler metal injection tooling (100) on the equipment working platform (200) of the brazing filler metal automatic injection machine. According to the process operation requirements, prepare the brazing filler metal and pour the prepared brazing filler metal into the brazing filler metal automatic injection machine. Using a CCD camera to obtain an image of the welding position between the blade body (1) and the cover plate (2), and adopting the method of inserting points and drawing lines to fit the geometric contour of the brazing seam to be welded between the blade body (1) and the cover plate (2), complete the programming of the brazing filler metal injection path, and obtain the injection path of the brazing filler metal. Start the solder automatic injector, so that the solder automatic injector operates according to the injection path of the solder and the preset solder injection process parameters. After the solder injection is completed, take out the part to obtain the part to be welded with the solder injected; thus, the solder injection at the position to be welded between the blade body (1) and the cover plate (2) is completed.

5. A brazing filler metal injection method according to claim 4, characterized in that The preset solder injection process parameters include the injection air pressure of the solder and the injection speed of the solder.

6. The solder injection method according to claim 5, wherein The injection air pressure of the solder is 140 KPa, and the injection speed of the solder is 8 mm / ms.

7. A brazing method for a turbine rotor blade assembly, characterized in that, It includes the following steps: Apply a flow blocker at the core hole of the blade body (1) to obtain the blade body (1) with the flow blocker applied. Based on the method of six-point energy storage spot welding, position the cover plate (2) on the blade body (1) to obtain the blade body (1) assembled with the cover plate (2). Use the solder injection method according to any one of claims 4-6 to inject solder at the position to be welded between the blade body (1) and the cover plate (2) to obtain the part to be welded with the solder injected. Perform vacuum brazing on the part to be welded with the solder injected, and after surface cleaning, obtain the turbine rotor blade assembly.

8. A brazing method for a turbine rotor blade assembly according to claim 7, characterized in that, During the process of applying a flow blocker at the core hole of the blade body (1) to obtain the blade body (1) with the flow blocker applied, apply the flow blocker at the core holes of the blade body (1) near the intake edge, near the exhaust edge, and in the middle part of the blade; wherein, the flow blocker is prepared by mixing Al2O3 fine powder and a water-based binder.

9. A brazing method for a turbine rotor blade assembly according to claim 7, characterized in that, In the blade body (1) assembled with the cover plate (2), a welding gap of 0.02-0.08 mm is provided between the blade body (1) and the cover plate (2).

10. A brazing method for a turbine rotor blade assembly according to claim 7, characterized in that, During the process of performing vacuum brazing on the part to be welded with the solder injected, hang the part to be welded with the tenon head facing up and the blade crown facing down on a graphite or ceramic material bracket and put it into the furnace for vacuum brazing.

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