CN113732616A - Method for repairing installation edge - Google Patents
Method for repairing installation edge Download PDFInfo
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- CN113732616A CN113732616A CN202111155921.1A CN202111155921A CN113732616A CN 113732616 A CN113732616 A CN 113732616A CN 202111155921 A CN202111155921 A CN 202111155921A CN 113732616 A CN113732616 A CN 113732616A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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Abstract
The invention provides a method for repairing an installation edge, which comprises the following processes of 1, turning the installation edge; step 2, spraying a KF306 coating on the inner seam allowance of the machined mounting edge; step 3, lathing the sprayed mounting edge; and 4, repairing the spray surface by using pliers to finish the repair of the mounting edge. The method is used for repairing the inner seam allowance of the mounting edge of the fan casing, on one hand, the size requirement can be met, on the other hand, the strength and service life requirements of the fan casing are also met, high-value fan casing parts are saved, the cost is greatly saved, and the waste of resources is avoided. Because the mode of installing the edge after the lathe machining spraying with higher efficiency is adopted through summarizing past experience and repeated tests on the spot, the repair time is well controlled, and the requirement of the production cycle of the overhaul of the fan casing can be met.
Description
Technical Field
The invention belongs to the technical field of aero-engines, and particularly belongs to a mounting edge repairing method.
Background
The inner spigot of the mounting edge of the overhaul fan casing of an aero-engine of a certain model has a certain deformation due to long service time. The seam allowance size of part installation limit is out of tolerance, has the meat deficiency problem. In the early stage of the problems, no effective repair process exists, and the problem parts are always stored on the site with the articles to be processed, so that the production and delivery tasks are seriously influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a mounting edge repairing method which can efficiently repair the inner seam allowance of the mounting edge of the meat-lacking fan casing to meet the requirements of a design drawing.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for repairing an installation edge comprises the following processes,
step 1, turning an installation edge;
step 2, spraying a KF306 coating on the inner seam allowance of the machined mounting edge;
step 3, lathing the sprayed mounting edge;
and 4, repairing the spray surface by using pliers to finish the repair of the mounting edge.
Preferably, in the step 1, when the part base body is turned off, the inner circle point of the lathe fixture is not more than 0.015, the end face is not more than 0.02, and the inner spigot point of the mounting edge of the correcting part is not more than 0.02 before machining.
Preferably, in the step 2, the spraying method adopts plasma spraying, and the thickness of the KF306 coating is not less than 0.3 mm.
Preferably, in step 3, a CVD coated cemented carbide insert is used for turning.
Preferably, in step 3, the point to point of the lathe fixture is not more than 0.015, the end face is not more than 0.03 and the external circle point to point runout of the installation edge of the correction part is not more than 0.02 during coating turning.
Preferably, in step 3, the turning parameters are cut into rollsThe speed S is 20-25 r/min, the feed F is 0.03-0.06, and the cutting depth apNot greater than 0.1 mm.
Preferably, in step 3, the machined part is subjected to three-coordinate detection, and the measuring point detected by the three-coordinate detection mounting edge is not less than 32 points.
Preferably, in step 3, feeding in the vertical direction during the turning process, and feeding to the outer side from the switching R; when the chamfer is turned, the cutter is lifted upwards from the lower side of the seam allowance of the mounting edge.
Preferably, in step 4, the end surface of the mounting edge of the part overspray part and the overspray surface of the inner spigot are trimmed by a file, so that the coating is flush with the end surface of the corresponding substrate.
Preferably, in step 4, the repaired mounting edge is inspected to check whether the part has a bump or a scratch on the appearance.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a method for repairing a mounting edge, which is used for continuously turning the mounting edge of a fan casing with out-of-tolerance and out-of-meat in diameter in step 1, and aims to provide space for subsequent spraying and ensure that a coating has enough adhesive force after spraying. The method has the advantages that on the premise of ensuring the strength of the part, the optimal matrix removal amount, namely the diameter of 0.3mm, is selected through calculation and verification.
And 2, spraying a KF306 coating on the mounting edge with meat deficiency and out-of-tolerance by adopting a plasma method, and increasing the machining allowance of the mounting edge. The advantages are that the KF306 coating is a metal coating, the hardness is close to that of the base material, the function of base body substitution can be achieved, meanwhile, the plasma spraying method is uniform and stable in spraying, and the adhesion effect of the sprayed coating can meet the use requirement. In order to ensure that the sprayed coating fully meets the allowance requirement of ensuring the design size subsequently, the coating thickness is designed to be minimum 0.3mm, namely, the diameter is reduced by at least 0.6mm by taking the inner spigot of the mounting edge as an example.
And 3, machining the mounting edge of the fan casing after the complementary spraying to the size required by the design, wherein the machining method is turning on a numerical control vertical lathe. The advantages are that: compared with the traditional grinding, the processing efficiency is greatly improved; secondly, in the process of coating the metal KF306, the coating is easy to crack and fall off, and the stable and reliable processing process is realized by optimizing processing parameters, cutters and feed routes; the CVD coating hard alloy blade is adopted for processing, the blade has better wear resistance, the stability of the processing process is ensured, and simultaneously, a foundation is laid for large-scale engineering application.
And 4, performing clamping repair on the end face of the mounting edge generated by spraying through a spraying layer to ensure smooth switching between the spraying surface and the metal matrix and remove redundant substances on the metal matrix. The method has the advantages that the processing tool and the processing direction during the spray repair by the determined pliers are ensured, and the working surface of the coating is not stripped or damaged due to the repair of the pliers.
The method is used for repairing the inner seam allowance of the mounting edge of the fan casing, on one hand, the size requirement can be met, on the other hand, the strength and service life requirements of the fan casing are also met, high-value fan casing parts are saved, the cost is greatly saved, and the waste of resources is avoided. Because the mode of installing the edge after the lathe machining spraying with higher efficiency is adopted through summarizing past experience and repeated tests on the spot, the repair time is well controlled, and the requirement of the production cycle of the overhaul of the fan casing can be met.
Drawings
FIG. 1 is a schematic, partially diagrammatic view of a mounting edge of a fan case according to the present invention;
FIG. 2a is a schematic view of a path of the present invention;
FIG. 2b is a schematic view of the present invention;
FIG. 3 is a schematic view of the direction of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Examples
The KF306 coating is a novel wear-resistant material and is widely applied to wear-resistant coatings of aviation parts. In order to save a large number of fan case parts made of the titanium alloy TC4 material, a repair process of spraying a KF306 coating on the fan case is adopted on the basis of comprehensive analysis and performances such as heat resistance, wear resistance, hardness and the like of the titanium alloy material. Because KF306 coating hardness is high, and the fragility is big, and the extremely easy fracture drops among the individual in-process of car processing, consequently behind the tang spraying KF306 coating in the installation limit, initial repair stage can only adopt the mill processing technology to process. Grinding machine equipment is limited, the grinding processing period is long, two days are needed for grinding an installation edge of a part, on one hand, a large amount of grinding machine equipment is occupied, and on the other hand, production efficiency and delivery nodes are seriously influenced. The most ideal processing method is to carry out vehicle processing on the inner rabbets of the mounting edges after spraying. After technical attack, efficient KF306 coating spraying mounting side turning is finally realized, as shown in FIG. 1, in this embodiment, a fan casing mounting side is taken as an example.
The invention relates to a method for repairing the mounting edge of a fan casing, which comprises the following steps,
step 1, turning an installation edge: the centering inner circle point of the lathe fixture is not more than 0.015, the end face is not more than 0.02, and the inner seam allowance point of the installation edge of the correcting part before machining is not more than 0.02. Assuming that the machining size required by the design drawing is that the diameter size of the inner spigot of the X vehicle mounting edge is X +0.3 (namely the diameter size is greater than the design diameter size by 0.3), the runout is not greater than 0.05, the actual size and the actual value of the runout are recorded in a limiting state, and the machining precision of the final size in the vehicle machining process is ensured by accurately aligning the clamp and the part state before machining.
Note that: after processing, the deformation condition of the part needs to be recorded, the jumping value of the lathed and repaired installation edge is checked in a free state on a machine tool, the maximum point and the minimum point of the inner circle diameter of the part are found out, and the installation edge end face at the corresponding position is marked by a marking pen;
step 2, spraying the whole circumference of the installation edge seam allowance: on the basis of the heat resistance, the wear resistance, the hardness and other properties of the titanium alloy material Tc4, a KF306 coating is sprayed on an inner spigot at the mounting edge of the casing, the plasma spraying method is adopted, the single side of the spraying thickness is not less than 0.3mm (the parameter contains the characteristic that the titanium alloy part is easy to deform), a 1m caliper is used for checking that the diameter size of the position (namely the maximum point of the inner circle diameter) marked with the large end face mark of the mounting edge of the part is less than X-0.6 (namely the diameter size is less than 0.6) or the diameter size is sprayed again, and the non-spraying surface is protected;
step 3, turning, installing edges after spraying: the centering clamp has a centering point of not more than 0.015, an end face of not more than 0.03 and a correcting part mounting edge outer circle centering jitter of not more than 0.02. The diameter of the maximum point of the excircle mounting edge measured by a 1m caliper is less than 0.3 of the size of the design drawing.
Turning parameters: cutting parameters: 20-25 r/min; the feeding amount F is 0.03-0.06 mm/r;
depth of cut ap: each cutting depth is not more than 0.1 mm;
note: the machining parameters are required to be optimal parameters which can ensure stable machining after being iterated after multiple field tests and must be strictly executed.
The size requirement is as follows: and (4) turning the diameter of the mounting edge until the diameter meets the requirement of a design drawing, detecting a measured value on a machine tool by using a standard component, and measuring and recording a mounting edge bounce value.
And (4) sending the part to a three-coordinate detection installation edge actual measurement value, wherein the measured point is required to be not less than 32 points. The purpose of this step is to carry out accurate detection to the spraying face size after the car processing to guarantee that it satisfies the dimensional tolerance requirement of design drawing. And the next procedure can be carried out only if the inspection is qualified. The detection method comprises the steps of placing the part on a three-coordinate detection platform in a free state, arranging one side to be detected on the upper side, uniformly distributing 32 points to be detected on a spraying surface machined by a three-coordinate probe along the circumference of the spraying surface, fitting the 32 points to be detected into a circle, and evaluating the average diameter of the circle, wherein the diameter is the diameter size of the spraying surface machined by the machine.
Considering that the KF306 coating has high hardness and large brittleness, the selected cutter has the characteristics of good wear resistance, heat resistance, oxidation resistance, small friction coefficient, low thermal conductivity and the like, and the CVD coating hard alloy blade with stable performance is selected through theoretical analysis and comparison tests of blades made of various materials on site.
The installation edge profile is processed by adopting the conventional processing sequence of feeding on one side and retracting on the other side. However, because the installation edge has a chamfer requirement, if the feed path is not reasonable, the coating often falls off. As shown in fig. 2a and fig. 2b, in fig. 2a, axial feed is performed from top to bottom, and after reaching the root R, the axial feed is withdrawn in a direction away from the base body in a radial direction, so as to ensure the diameter size of the spigot of the mounting edge; FIG. 2b shows the tool lifted from the lower side to the upper side in order to form a chamfer angle, and the chamfer angle is raised from the lower side to the upper side to avoid the weak point of the coating layer and the substrate, so as to prevent the coating layer from being lifted. When the coating machining allowance is large, feeding is performed in the vertical direction, the cutter is fed to the switching R and then pulled to the outer side along the same direction, the radial and axial sizes of the inner spigot of the mounting edge are guaranteed, and the radial coating and the end surface substrate can be smoother in switching. It should be particularly noted that when the vertical feed is carried out to the switching R position, because the cutter is in contact with the coating arc surface at the moment, the contact area is increased, the resistance is large, and in order to prevent the coating from falling off due to overlarge external force, the feeding is adjusted to be small, namely, the initial feeding is 0.06mm/R, and when the cutter reaches the position, the feeding is attenuated to 0.03 mm/R; to ensure the stability of the processing. In addition, along the radial outside tool withdrawal of installation limit, for preventing that the coating from droing, terminal surface thickness discrepancy to the spraying coating height point tool setting is crossed on the installation limit face, only goes the high point, and remaining spraying coating that crosses on this face is repaiied by pincers worker's pincers in next process. Secondly, after the radial dimension and the axial dimension are processed in place, the processing allowance of the coating is smaller, and only the chamfer is left for processing. At this time, the cutting path shown in fig. 2b must be adopted to process the chamfer to avoid the weak point of the coating and the substrate combination, otherwise the coating on the outer circle of the mounting edge risks being lifted.
Step 4, repairing the spraying surface by using pliers: the end surface of the mounting edge of the over-spraying part and the over-spraying surface of the inner spigot of the part are trimmed by a file, so that the coating is leveled with the end surface of the corresponding substrate, and the substrate is not allowed to be filed; the force applied when repairing the spraying surface is from the coating to the metal (figure 3), so as to prevent the coating from being stripped or damaged; cleaning the parts;
and 5, checking: check whether all the processes before the present process are performed. And (4) inspecting the appearance of the part for bruising, scratches and the like, and smoothing the bruising and scratches by using a file and a sand paper clamp.
The method is used for repairing the inner seam allowance of the mounting edge of the fan casing, on one hand, the size requirement can be met, on the other hand, the strength and service life requirements of the fan casing are also met, high-value fan casing parts are saved, the cost is greatly saved, and the waste of resources is avoided. Because the mode of installing the edge after the lathe machining spraying with higher efficiency is adopted through summarizing past experience and repeated tests on the spot, the repair time is well controlled, and the requirement of the production cycle of the overhaul of the fan casing can be met.
Claims (10)
1. A method for repairing a mounting edge, comprising the steps of,
step 1, turning an installation edge;
step 2, spraying a KF306 coating on the inner seam allowance of the machined mounting edge;
step 3, lathing the sprayed mounting edge;
and 4, repairing the spray surface by using pliers to finish the repair of the mounting edge.
2. The method for repairing a mounting edge of a component as claimed in claim 1, wherein in step 1, the inner circle center point of the lathe fixture is not more than 0.015 and the end face is not more than 0.02 when the component substrate is lathed off, and the inner seam allowance center point of the mounting edge of the calibration component before machining is not more than 0.02.
3. The method for repairing a mounting edge of claim 1, wherein in the step 2, the spraying method is plasma spraying, and the thickness of the KF306 coating is not less than 0.3 mm.
4. A mounting-edge repair method according to claim 1, characterized in that in step 3, a CVD-coated cemented carbide insert is used for turning.
5. The method for repairing a mounting edge of a component as claimed in claim 1, wherein in step 3, the lathe fixture is aligned to the point of not more than 0.015, the end face is not more than 0.03 and the external circle to point runout of the mounting edge of the component to be corrected is not more than 0.02 when the coating is lathed.
6. The method for repairing a mounting flange as claimed in claim 1, wherein in step 3, the vehicle is turnedThe cutting speed S of the machining parameters is 20-25 r/min, the feed F is 0.03-0.06, and the cutting depth apNot greater than 0.1 mm.
7. The method for repairing a mounting edge as claimed in claim 1, wherein in step 3, the machined part is subjected to three-coordinate detection, and a measuring point detected by the three-coordinate detection mounting edge is not less than 32 points.
8. The method for repairing the installation edge as claimed in claim 1, wherein in the step 3, the cutting is firstly carried out in the vertical direction in the turning process, and the cutting is carried out to the position of the switching R and is carried out towards the outer side; when the chamfer is turned, the cutter is lifted upwards from the lower side of the seam allowance of the mounting edge.
9. The method for repairing a mounting edge of a component according to claim 1, wherein in step 4, the end surface of the mounting edge of the over-spray part and the over-spray surface of the inner spigot are trimmed by a file to make the coating flush with the corresponding end surface of the substrate.
10. The method for repairing a mounting edge as claimed in claim 1, wherein in step 4, the repaired mounting edge is inspected to check whether or not the appearance of the component is scratched or knocked.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115415734A (en) * | 2022-09-29 | 2022-12-02 | 中国航发动力股份有限公司 | Blisk repairing method with deviated diameter size |
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