Defect repairing method of pipe type detection molded surface clamp and repaired molded surface clamp

Abstract

The invention discloses a defect repairing method of a pipe type detection molded surface clamp and a repaired molded surface clamp, and belongs to the technical field of aero-engine pipe assembly machining. According to the method, a standard pipe type corresponding to the pipe type detection molded surface clamp to be repaired is coated with a layer of separating agent; the method comprises the following steps: uniformly smearing a plastic object on a to-be-repaired part of a tubular detection molded surface clamp, wherein the plastic object is prepared from denture powder and denture water; pressing force is applied to enable the standard tube to be completely attached to the tube type detection profile clamp, and then redundant plastic objects are removed; and the pressing force is kept, so that the plastic objects in the standard tube type and the tube type detection molded surface clamp are formed, a repair layer is obtained, and after the repair layer is solidified and hardened, defect repair of the tube type detection molded surface clamp can be completed. The damaged part of the tool is repaired by adopting the denture powder and the denture water, the operation is simple, the repair speed is high, any machining method is not needed, and the use is convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of the processing of aero-engine pipe assemblies, and particularly relates to a method for repairing defects of a profile fixture for pipe type detection and the repaired profile fixture. Background Art

[0002] During the manufacturing and maintenance process of a certain type of aero-engine, the external pipeline has a complex pipe type, and most of the pipe types are irregular shapes. Generally, a profile fixture is used for processing and detecting the pipe type, which can ensure the shape and dimensional accuracy of the pipe type during the processing and detection, can handle various complex-shaped pipe types, and reduces the requirements for the skills of operators. It is an efficient and accurate solution. The profile fixture is manufactured according to the standard pipe type. When detecting the pipe type, the profile of the profile fixture is calibrated according to the standard pipe type. The profile is generally assembled on the body of the profile fixture in a detachable manner. Only after the profile fixture is calibrated can the pipe type detection of the part be carried out.

[0003] When detecting the pipe type of the external pipeline of the aero-engine, as a key tool to ensure the accuracy and consistency of the pipe type, the pipe type of the part needs to fit with the profile of the profile fixture. The degree of fit between the profile and the pipe type of the part directly determines the accuracy of the detection result, and it is regarded as qualified within a certain deviation range. However, after long-term use, the profile fixture will have defects due to damages such as breakage and wear, which will affect its service performance and cause the profile fixture to be unusable.

[0004] Currently, for the repair of the profile fixture, the traditional repair method is to remanufacture a set of profiles and then assemble them on the body of the profile fixture. Since the spatial shape of the profile is relatively complex, the manufacturing difficulty is extremely high. Usually, after processing, it needs to be manually ground according to the standard pipe type to ensure the final forming and put into use of the profile. The processing cycle generally takes 3 months, which is time-consuming and laborious, and has a great impact on production delivery. In the field of engine part repair, the utility model patent with the application number 201620970292.6 and the name of "A Profile Structure for Spray Repair of Rotating Parts" reports a profile repair of a rotating body, specifically including a coating attachment surface opened on the profile to be repaired of the rotating part, a coating is provided on the coating attachment surface, the coating attachment surface includes a main coating attachment surface opened radially inward along the profile to be repaired, and both ends of the main coating attachment surface are connected to the profile to be repaired through transition surfaces. The free ends of the transition surfaces extend to the surface of the profile to be repaired and are at a certain distance from the edge of the adjacent profile to be repaired. This patent does not improve the repair process. It mainly avoids the fragmentation and chipping of the coating edge from the structure and is realized through the existing spraying, and cannot be used on the above-mentioned profile fixture. Therefore, there is an urgent need for a method for repairing defects of a profile fixture for pipe type detection that is simple to operate, has a fast repair speed, and does not require any machining. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a method for repairing defects of a tube-shaped detection profile fixture and the repaired profile fixture, so as to solve the problems that the current repair of the profile fixture takes a long time and has a high processing difficulty, which has a great impact on production and delivery, and is fast, effective, simple to operate, fast in repair speed, and does not require any machining, and is convenient to use.

[0006] The present invention is realized through the following technical solutions: A method for repairing defects of a tube-shaped detection profile fixture, specifically, includes the following steps: Step 1, apply a layer of release agent on a standard tube corresponding to the tube-shaped detection profile fixture to be repaired; Step 2, evenly apply a plastic material on the repair part of the tube-shaped detection profile fixture to be repaired, and the plastic material is prepared by mixing dental stone powder and dental stone liquid; Step 3, apply a pressing force to make the standard tube obtained in Step 1 completely fit on the tube-shaped detection profile fixture obtained in Step 2, and then remove the excess plastic material; Step 4, keep the pressing force in Step 3, so that the plastic material in the standard tube and the tube-shaped detection profile fixture forms a repair layer. Wait for the repair layer to solidify and harden to complete the defect repair of the tube-shaped detection profile fixture.

[0007] Preferably, the release agent in Step 1 is butter.

[0008] Preferably, in Step 1, the release agent is applied at the position of the standard tube corresponding to the repair part of the tube-shaped detection profile fixture described in Step 2, and not applied to other positions.

[0009] Preferably, in Step 2, first use a polishing wheel to polish the repair part of the tube-shaped detection profile fixture to remove oil stains and impurities and expose the metallic luster, then wipe it clean with alcohol or acetone, and then apply the plastic material prepared by mixing dental stone powder and dental stone liquid.

[0010] Preferably, in the plastic material in Step 2, the mass ratio of dental stone powder to dental stone liquid is specifically (2-3):(0.5-1.5).

[0011] Preferably, Step 2 needs to obtain the plastic material according to the following process: Pour a certain amount of dental stone liquid into a clean glass, then sprinkle dental stone powder into the glass containing dental stone liquid until the dental stone powder is completely wetted by all the dental stone liquid, and then use a stainless steel tube to mix evenly to obtain a mixture. Let the mixture stand at room temperature until it becomes dough-like to obtain the plastic material.

[0012] Preferably, in Step 4, keep the pressing force in Step 3 for 2-3 minutes to obtain the repair layer.

[0013] Preferably, after the repair layer is obtained in step 4, the standard tube mold is removed, and the separating agent on the standard tube mold is removed.

[0014] Preferably, in step 4, the repair layer is left standing at room temperature for 30 - 45 minutes. After the repair layer at the repair site solidifies and hardens, the defect repair of the tube mold detection profile fixture is completed.

[0015] A repaired tube mold detection profile fixture of the present invention, the tube mold detection profile fixture includes a tube mold detection profile fixture to be repaired and a plastic material formed and solidified on the repair site of the tube mold detection profile fixture to be repaired, and the plastic material is prepared by mixing dental stone powder and dental stone liquid.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a method for repairing defects of a tube mold detection profile fixture. A plastic material prepared by mixing dental stone powder (polymethyl methacrylate, PMMA) and dental stone liquid (methyl methacrylate monomer) is used for repairing the damage. After the surface of the particles in the dental stone powder contacts the dental stone liquid, the monomer molecules penetrate and dissolve the surface of the powder body to form a viscous paste. The dental stone liquid usually contains an initiator (such as benzoyl peroxide) and an accelerator (such as hydroquinone). After the two are mixed, the initiator decomposes to generate free radicals, triggering a free radical polymerization reaction between the monomer molecules. The monomer molecules open through double bonds and are connected to each other to form long-chain polymers, and the material can gradually solidify and harden from a liquid state to be cured. Based on this, a separating agent is first applied to the standard tube mold corresponding to the tube mold detection profile fixture to be repaired, which can form an isolation film and prevent the plastic material at the repair site of the tube mold detection profile fixture from adhering to and pressing against each other when they are in contact, which will affect the fitting degree of the repair site and further affect the accuracy of the detection result. After the standard tube mold is completely fitted on the tube mold detection profile fixture, the excess plastic material is removed to prevent it from being difficult to remove later, and thus avoid leaving interfering substances at the parts of the tube mold detection profile fixture that do not need to be repaired, and maintain the pressing force, which can make the plastic material in the standard tube mold and the tube mold detection profile fixture take shape. After the obtained repair layer solidifies and hardens, the defect repair of the tube mold detection profile fixture can be completed. The present invention uses dental stone powder and dental stone liquid to repair the damaged part of the tooling, with simple operation, fast repair speed, no need to use any mechanical processing methods, convenient to use, and at the same time fast and effective, which can solve the problems of long conventional repair time and high processing difficulty. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the use state of the profile fixture of the present invention.

[0018] Figure 2 is Figure 1 The sectional view taken along line A - A in

[0019] In the figure: 1 - surface fixture body, 2 - form tire, 3 - standard sample, 4 - surface fixture. Detailed implementation mode

[0020] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the following further elaborates on the specific implementation mode of the present invention in combination with specific embodiments. The following is an explanation of the present invention rather than a limitation.

[0021] The present invention discloses a method for repairing damage to a surface fixture for detecting the tube shape of an external pipeline of an aeroengine and a repaired tube shape detection surface fixture. The repaired tube shape detection surface fixture can be obtained by the method for repairing damage to the surface fixture for detecting the tube shape of an external pipeline of an aeroengine.

[0022] Specifically, the method for repairing damage to the surface fixture for detecting the tube shape of an external pipeline of an aeroengine of the present invention includes the following implementation steps: Step 1: Apply a layer of release agent on the standard tube shape corresponding to the tube shape detection surface fixture to be repaired. Step 2: Uniformly apply a plastic material on the repair part of the tube shape detection surface fixture to be repaired. The plastic material is prepared by mixing dental stone powder and dental stone liquid, and the application amount is such that it overflows the original fixture surface. Step 3: Apply a pressing force by hand to make the standard tube shape obtained in Step 1 fully fit on the tube shape detection surface fixture obtained in Step 2, and then remove the excess plastic material. Step 4: Maintain the pressing force in Step 3 to form the plastic material in the standard tube shape and the tube shape detection surface fixture to obtain a repair layer. Wait for the repair layer to solidify and harden to complete the repair of the defect of the tube shape detection surface fixture.

[0023] The release agent described in Step 1 is butter.

[0024] In Step 1, apply the release agent at the position of the standard tube shape corresponding to the repair part of the tube shape detection surface fixture described in Step 2, and do not apply it to other positions.

[0025] In Step 2, first use a polishing wheel to polish the repair part of the tube shape detection surface fixture to remove oil stains and impurities and expose the metallic luster, then wipe it clean with alcohol or acetone, and then apply the plastic material prepared by mixing dental stone powder and dental stone liquid.

[0026] The polishing wheel is a pressed flat wheel composed of several polishing wheel pieces pressed together. A layer of polishing oil layer is evenly coated on the outer surface of each wheel piece. No additional lubricating oil needs to be added during the polishing process. By rotating at high speed and rubbing against the surface of the workpiece, scratches, oxide layers, burrs, etc. are removed to improve the surface finish and aesthetics.

[0027] In the plasticizable material described in Step 2, the mass ratio of denture base powder to denture liquid is specifically (2-3):(0.5-1.5).

[0028] Step 2 needs to obtain the plasticizable material according to the following process: Pour a quantitative amount of denture liquid into a clean glass, and then sprinkle the denture base powder into the glass containing the denture liquid until the denture base powder is completely wetted by all the denture liquid. Then, use a stainless steel tube to mix evenly to obtain a mixture. Let the mixture stand at room temperature until it becomes dough-like to obtain the plasticizable material.

[0029] In Step 4, maintain the pressing force in Step 3 for 2-3 minutes to obtain the repair layer.

[0030] After obtaining the repair layer in Step 4, remove the standard tube type and clean the separating agent on the standard tube type.

[0031] In Step 4, let the repair layer stand at room temperature for 30-45 minutes. After the repair layer at the repair site solidifies and hardens, the defect repair of the tube type detection surface fixture can be completed.

[0032] Denture base powder (polymethyl methacrylate, PMMA) and denture liquid (methyl methacrylate monomer) are usually common materials in the field of oral repair, mainly used for making denture bases, temporary crown bridges, individual trays, palatal guards, periodontal splints, and denture relining repairs, etc. After the denture base powder and the denture liquid are mixed, a series of physical and chemical changes will occur, and these changes will ultimately cause the material to change from a plastic state to a solid repair body.

[0033] The present invention applies it to the damage repair of the surface fixture for tube type detection of the external pipeline of an aeroengine. After the surface of the particles in the denture base powder comes into contact with the denture liquid, the monomer molecules penetrate and dissolve the surface of the powder body to form a viscous paste. The powder particles swell due to water absorption, the volume increases, and the fluidity gradually decreases. The denture liquid usually contains an initiator (such as benzoyl peroxide) and an accelerator (such as hydroquinone). After the two are mixed, the initiator decomposes to generate free radicals, triggering the free radical polymerization reaction between the monomer molecules. The monomer molecules open through double bonds and are connected to each other to form long-chain polymers, and the material gradually solidifies from a liquid state. After solidification, the strength, hardness, and wear resistance of the material are significantly improved. At the same time, it is necessary to pay attention to controlling the ratio of the two. If there is more powder and less liquid, the material is brittle, and if there is less powder and more liquid, the material is too soft. It is necessary to strictly control the powder-liquid ratio and the mixing method to ensure the strength, hardness, and wear resistance of the solidified and hardened repair layer, so as to ensure that the repaired tube type detection surface fixture can be used for a long time.

[0034] The invention discloses a repaired tubular detection profile fixture, which comprises a tubular detection profile fixture to be repaired and a plastic material formed and solidified on a repairing part of the tubular detection profile fixture to be repaired. The plastic material is prepared by mixing tooth tray powder and tooth tray water, and the preparation process is the same as step 2 in the method for repairing a damaged tubular detection profile fixture.

[0035] Specific implementation case 1 The profile fixture used in the external pipeline lubricating oil pipe assembly of an aircraft engine has been damaged, missing blocks, and worn due to long-term use, resulting in the profile fixture being unable to be used normally. The specific steps for repairing the profile fixture are as follows: Step 1: Use a polishing wheel to polish the damaged, missing, and worn parts of the tube test surface fixture to remove oil stains and impurities and reveal the metallic luster, and then wipe it clean with acetone; Step 2: Apply a layer of separation agent on the standard tube (standard sample) corresponding to the part number. Here, butter is used for application. The focus is on applying butter to the position of the standard tube corresponding to the repair part of the tube detection surface fixture, and no butter is applied to other positions; Step 3, mix with tray water: mix the tray powder and tray water according to the required amount in a mass ratio of 2.5:1, and mix according to the following method: Pour a certain amount of dental tray water into a clean glass, then sprinkle the dental tray powder into the glass containing the dental tray water until the dental tray powder is completely soaked by all the dental tray water, and then mix it evenly with a stainless steel pipe to obtain a mixture; Step 4, leaving the mixture prepared in step 3 to stand at room temperature, and when the mixture becomes a dough-like plastic, evenly apply it to the defective, worn, or missing parts of the molding fixture, with the amount of application being such that it overflows the original fixture molding surface; Step 5: Fit the standard tube coated with butter in step 2 onto the surface fixture, and apply a certain amount of pressure by hand to make the tube fit completely with the fixture surface. Figure 1 and Figure 2 As shown, the mold 2 is assembled on the molding fixture body 1 to obtain the molding fixture 4, the standard sample 3 is completely attached to the fixture molding surface, the molding surface to be repaired is consistent with the standard molding surface, and the overflowed excess plastic is cleaned without reducing the pressing force, and then the pressure is maintained and allowed to stand for 2 minutes, so that the plastic on the molding surface to be repaired is completely formed to obtain the repair layer, and the standard tube is removed, and the release agent butter on the standard tube is removed; In the actual application process, the mold 2 of the molding fixture 4 is only set at the bending part of the standard sample, and the two are fitted together. Figure 1 This is just for illustration. If other pipe assemblies of external pipelines of aircraft engines are used, the number, size and angle of the bends will be different.

[0036] Similarly, Figure 1 for the purpose of illustration and to keep the figure as simple as possible, other components such as the joints at both ends are omitted, which is why the actual component appears to have only a bent pipe. From Figure 1 the perspective of appearance, the standard pipe type and the profile fixture do not fit together. This is to facilitate seeing that they are two components, but actually they are fitted together.

[0037] Step 6: Let it stand at room temperature. After waiting for 30 minutes, when the plasticizer at the repair area has solidified and become hard, the profile fixture is then repaired and can be used normally.

[0038] The entire procedure is simple to operate, has a fast repair speed, does not require any machining methods, and is convenient to use.

[0039] Specific implementation case 2 For a certain external pipeline component of an aero-engine, due to long-term use, some parts of the profile of the used profile fixture are missing blocks, resulting in the inability of the profile fixture to be used normally. For the repair of this profile fixture, the specific steps are as follows: Step 1: First, use a polishing wheel to polish the area with missing blocks of the profile fixture for pipe type detection to remove oil stains and impurities, showing a metallic luster, and then wipe it clean with alcohol; Step 2: Apply a layer of butter on the standard sample corresponding to this part number, with the key being to apply butter at the position of the standard pipe type corresponding to the repair area of the profile fixture for pipe type detection, and not apply it to other positions; Step 3: Mix dental stone powder and dental liquid: According to the required amount, mix dental stone powder and dental liquid in a mass ratio of 2:0.5. The specific mixing method is as follows: Pour a certain amount of dental liquid into a clean glass, and then sprinkle dental stone powder into the glass containing the dental liquid until the dental stone powder is completely wetted by all the dental liquid, and then use a stainless steel pipe to mix it evenly to obtain a mixture; Step 4: Let the mixture prepared in Step 3 stand at room temperature. When the mixture becomes a dough-like plasticizer, evenly apply it to the area with missing blocks of the profile fixture, and the application amount should overflow the original fixture profile; Step 5: Fit the standard pipe type coated with butter in Step 2 onto the profile fixture, apply a certain pressing force by hand to make the pipe type fit completely with the fixture profile. When the profile at the repair area conforms to the standard profile, while not weakening the pressing force, remove the excess plasticizer that overflows, and then keep the pressure and let it stand for 3 minutes to make the plasticizer at the profile of the repair area completely take shape to obtain a repair layer. Remove the standard pipe type and clean the parting agent butter on the standard pipe type; Step 6: Let it stand at room temperature. After waiting for 40 minutes, when the plasticizer at the repair area has solidified and become hard, the profile fixture is then repaired and can be used normally.

[0040] The whole step comparison operation is relatively simple, the repair time is short, and no mechanical processing method is adopted, which is convenient to use.

[0041] Specific implementation case 3 For an external lubricating oil pipeline assembly of an aeroengine, due to long-term use, some profiles of the used profile fixture are worn, resulting in the inability of the profile fixture to be used normally. For the repair of this profile fixture, the specific steps are as follows: Step 1: First, use a polishing wheel to polish the worn part of the profile fixture for pipe type detection to remove oil stains and impurities, showing a metallic luster, and then wipe it clean with acetone; Step 2: Apply a layer of butter on the standard sample corresponding to this part number, with emphasis on applying butter at the position of the standard pipe type corresponding to the repair part of the profile fixture for pipe type detection, and not applying it to other positions; Step 3: Mix dental stone powder and monomer: According to the required amount, mix dental stone powder and monomer in a mass ratio of 3:1.5, and the specific mixing method is as follows: Pour a fixed amount of monomer into a clean glass, and then sprinkle dental stone powder into the glass containing the monomer until the dental stone powder is completely wetted by all the monomer, and then mix it evenly with a stainless steel pipe to obtain a mixture; Step 4: Let the mixture prepared in Step 3 stand at room temperature. When the mixture becomes a dough-like plastic material, evenly apply it to the worn part of the profile fixture, and the application amount should overflow the original fixture profile; Step 5: Fit the standard pipe type coated with butter in Step 2 on the profile fixture, apply a certain pressing force by hand to make the pipe type fit completely with the fixture profile. When the profile of the repaired part conforms to the standard profile, while not weakening the pressing force, remove the excess plastic material that overflows, and then keep the pressure and stand for 2 minutes to make the plastic material at the profile of the repaired part fully formed to obtain a repair layer. Remove the standard pipe type and clean the separating agent butter on the standard pipe type; Step 6: Stand at room temperature. After waiting for 35 minutes, the plastic material at the repaired part solidifies and hardens after curing, and then the profile fixture is repaired and can be used normally.

[0042] It can be seen from the above steps that the whole step operation is simple, the time used is short, and no mechanical processing method is adopted, which is relatively convenient to use.

Claims

1. A defect repair method for a tube detection profile fixture, characterized in that: The following steps are involved: S1, applying a separating agent on a standard tube corresponding to the tube detection surface fixture to be repaired; S2, evenly applying a plastic material prepared by dental tray powder and dental tray water on the repairing part of the tubular detection surface fixture to be repaired; S3, applying a pressing force to make the standard tube obtained in S1 completely fit on the tube test surface fixture obtained in S2, and then removing excess plastic; S4, maintaining the pressing force in S3, forming the plastics in the standard tube and the tube detection profile fixture to obtain a repair layer, and waiting for the repair layer to solidify and harden, completing the defect repair of the tube detection profile fixture.

2. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: The separating agent described in S1 is butter.

3. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: S1 applies a separating agent to the position of the standard tube corresponding to the repairing part of the tube detection surface fixture of S2.

4. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: S2 first polishes the repaired part of the tube detection surface fixture, then wipes it clean with alcohol or acetone, and then applies a plastic made of dental tray powder and dental tray water.

5. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: In the plastic material described in S2, the mass ratio of the tooth tray powder to the tooth tray water is (2-3): (0.5-1.5).

6. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: S2 obtains plastic material according to the following process: Adding the tooth tray powder into the tooth tray water until the tooth tray powder is completely soaked by the tooth tray water, and then blending evenly to obtain a blended product, and leaving the blended product to stand at room temperature until it becomes a dough to obtain a plastic product.

7. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: S4 maintains the pressing force in S3 for 2-3 minutes to obtain a repair layer.

8. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: After S4 obtains the repair layer, the standard tube is removed and the separating agent on the standard tube is removed.

9. The defect repair method of the tube detection profile fixture according to claim 1, characterized in that: In S4, the repair layer is left to stand at room temperature for 30-45 minutes to complete the defect repair of the tube detection profile fixture.

10. A repaired tubular detection profile fixture obtained by the defect repairing method of the tubular detection profile fixture according to any one of claims 1 to 9, characterized in that: The tubular detection profile fixture comprises a tubular detection profile fixture to be repaired and a plastic material formed and solidified on a repairing part of the tubular detection profile fixture to be repaired.

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