CN110026907B - Prestressed shot blasting forming method for broken rib area of integral ribbed wallboard - Google Patents
Prestressed shot blasting forming method for broken rib area of integral ribbed wallboard Download PDFInfo
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- CN110026907B CN110026907B CN201910268574.XA CN201910268574A CN110026907B CN 110026907 B CN110026907 B CN 110026907B CN 201910268574 A CN201910268574 A CN 201910268574A CN 110026907 B CN110026907 B CN 110026907B
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- shot blasting
- broken rib
- rib area
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- broken
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
Abstract
The invention discloses a prestressed shot-peening forming method for a broken rib area of an integral ribbed wallboard. When the integral wallboard prestress clamping is started, a forming tool is installed in a corresponding broken rib area, the forming tool is adjusted to a proper position according to the height of a rib, meanwhile, the forming tool is fixedly connected with a machine tool guide rail, the auxiliary prestress clamping of the broken rib area is realized by adjusting a feed bolt on the forming tool, the broken rib area of the integral wallboard is effectively controlled in the prestress clamping process, the shape is not suddenly changed, and finally the smooth state of the integral wallboard prestress clamping is ensured.
Description
Technical Field
The application relates to the technical field of aircraft manufacturing, in particular to a shot blasting forming method for a broken rib area of an integral ribbed wallboard.
Background
The shot-peening forming technology is a mature plastic forming method for the wall plate of the metal wing at present, and in order to obtain a larger curvature shape, prestress is usually applied in the shot-peening forming process, so that the wall plate is pre-deformed in an elastic range before shot peening, and then is subjected to plastic deformation under the impact of high-speed running shots, and finally the shape required by theory is obtained. Since it is difficult to obtain a large curvature profile by shot blasting without applying a prestress by using only shots, it is possible to obtain a profile theoretically required only by shot blasting in a prestressed state for a metal wall plate having a high rigidity such as a wholly ribbed plate. Saddle-type integral ribbed wallboard belongs to a typical example of the wallboard, however, in the current practical scientific research and production, certain problems still exist in the prestressed forming of the saddle-type integral ribbed wallboard: "the rib length of whole wallboard is not equal completely, the disconnected muscle region of rib is incompletely in on same vertical face, the regional rigidity difference of disconnected muscle of wallboard is great with other ribbed regions, prestressing force clamping in-process can not select prestressing force clamping mode according to the position of disconnected muscle head completely, consequently, the wallboard is in prestressing force clamping in-process must have partial disconnected muscle region to be in" no prestressing force clamping district ", lead to the regional deformation of prestressing force clamping process disconnected muscle head inconsistent with ribbed region deformation, the whole prestressing force clamping of wallboard is not smooth, the regional appearance of disconnected muscle appears the sudden change easily. "
Saddle type whole wallboard of muscle is when carrying out the preflex clamping, generally set up the atress stand at the wallboard internal surface, set up application of force stand at the wallboard surface, with the wallboard from the surface prestressing force, require that the wallboard is whole to the inner surface uplift on length direction, at this moment, the regional appearance of disconnected muscle head that locates in "no prestressing force clamping district" can take place the sudden change, produce great stress concentration, rib and the torn phenomenon of covering appear at prestressing force clamping in-process even, the peening shaping effect of wallboard is seriously influenced. For the situation, no effective method can meet the optimal prestress clamping mode of the wall plate and can ensure the ideal prestress state of the broken rib head area at present. In addition, the targeted research on the prestressed shot-peening forming of the broken rib area of the integral ribbed wallboard is lacked at home and abroad, and the problems can not be solved well by adjusting shot-peening process methods and process parameters at present.
Disclosure of Invention
The application aims to solve the practical problems in the prior art and provides a prestress shot blasting forming method for a broken rib area of an integral ribbed wallboard.
A method for forming a broken rib area of an integral ribbed wallboard by prestress shot blasting comprises the steps of designing an auxiliary prestress shot blasting forming tool for the broken rib area, carrying out prestress clamping on a broken rib area of a short rib strip with a relatively long length, and combining the integral prestress clamping of the wallboard, so that a good prestress clamping state of the integral ribbed wallboard is achieved. And after clamping is completed, performing chordwise shot blasting forming on the outer surface of the part in the broken rib area, performing spanwise shot blasting forming on the ribs on the inner surface of the broken rib area, and finally performing shot blasting shape correction according to the shape state until the shape of the broken rib area meets the theoretical requirement, namely completing the shot blasting forming of the broken rib area.
The utility model provides a regional prestressing force peening forming method of whole belted steel wallboard broken rib, including an auxiliary prestressing force peening forming tool, auxiliary prestressing force peening forming tool is including connecting the support, U type piece, feed the bolt, connect support lower part and lathe guide rail cooperation, slide along the guide rail and can fix on the guide rail, U type piece is fixed on the support, U type piece center be equipped with the screw thread blind hole that feeds the bolt, the regional card of belted steel wallboard broken rib is in the U type opening of U type piece, the laminating of U type opening face is on the ventral plate face of wallboard, carry out the method of taking shape, including following step:
1, connecting an auxiliary prestress forming tool connecting support with a lower guide rail of a machine tool, enabling a broken rib area of the ribbed wallboard to fall into a U-shaped opening of a U-shaped block, and pushing a U-shaped block to press a web surface to a set pre-bending value by a feed bolt to complete prestress clamping of the broken rib area of the ribbed wallboard;
2 after the prestress clamping, protecting the partial area of the outer surface of the broken rib area by using a shot blasting protection adhesive tape
3, performing chordwise shot blasting forming on the outer surface of the broken rib area
4, performing spanwise shot blasting forming on the inner surface of the broken rib area
5 after the spanwise peening is accomplished, unload wallboard prestressing force clamping, place the wallboard and carry out the appearance inspection on the appearance inspection model, if the regional appearance of broken rib is laminated the inspection model completely, then need not carry out the peening school shape, otherwise, adopt ultrasonic peening machine to carry out the peening school shape to the regional inside and outside surface of broken rib, judge string direction or the unsatisfied requirement of spanwise appearance according to the laminating state, manual control ultrasonic peening machine progressively laminates the model and carries out string direction or spanwise school shape, to finally satisfying the requirement.
The beneficial effect of this application lies in: aiming at the difficult problem of the shape forming of the broken rib area of the existing integral ribbed wallboard, the method is provided, namely, the prestressed shot blasting forming is carried out on the broken rib area, and the phenomenon that the shape of the broken rib area is out of control in the process of prestress clamping of the integral ribbed wallboard is eliminated by designing an auxiliary prestressed shot blasting forming tool of the broken rib area and applying prestress to the broken rib area, so that the broken rib area is smooth in shape and free of stress concentration points in the prestress state. And controlling the appearance of the broken rib area from the source, and then performing chordwise shot blasting forming, spanwise forming and shot blasting shape correction on the broken rib area to finally obtain the qualified appearance of the broken rib area. The auxiliary prestress shot blasting forming tool for the broken rib area is simple in structure, convenient to clamp and operate in prestress, and capable of fundamentally improving the condition that the appearance of the broken rib area is easy to lose control. In addition, by measuring the chord-wise shape of the broken rib area in time in the prestress clamping process, the double convex trend obvious area on the outer surface part of the broken rib area can be protected before the chord-wise shot blasting of the broken rib area is formed, and the irreversible shape is prevented from being generated in the later shot blasting process of the double convex area. And finally, the manual ultrasonic shape correction after the spanwise forming can flexibly carry out shot blasting shape correction according to the actual shape of the broken rib area, and finally, the smooth shape of the broken rib area is ensured. The difficult problems of shape control, shot blasting forming and the like of the broken rib area of the integral ribbed wallboard are well solved.
The present application is described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a prestressed clamping state of an integral panel;
FIG. 2 is a schematic diagram of a state when a pre-stress clamping is not adopted in a broken rib area;
FIG. 3 is a schematic view of an auxiliary pre-stress shot peening tool and pre-stress application;
FIG. 4 is a schematic view illustrating the installation of an auxiliary pre-stressed shot-peening forming tool;
FIG. 5 is a schematic view of the overall state of the wall panel after the installation of the auxiliary pre-stress shot-peening tool;
FIG. 6 is a schematic diagram of a broken rib area state after an auxiliary prestress shot-peening forming tool is installed;
FIG. 7 is a schematic view of a protective area before chord-wise shot blasting on the outer surface of a broken rib area and chord-wise shot blasting forming;
FIG. 8 is a schematic view of the spanwise shot peening of a bead-broken region.
The numbering in the figures illustrates: 1. an integral wall panel; 2. a pre-stress clamp; 3. reinforcing ribs; 4. a broken rib area; 5. an auxiliary prestress shot blasting forming tool; 6. connecting a support; 7. a U-shaped block; 8. a feed bolt; 9. a machine tool guide rail; 10. a web face; 11. the middle point of the broken rib area; 12. an inner surface of the wall plate; 13. the side surface of the rib; 14. elbow nozzle
Detailed Description
The utility model provides a regional prestressing force peening forming method of whole ribbed wallboard broken rib, including an auxiliary prestressing force peening forming frock 5, auxiliary prestressing force peening forming frock 5 is including connecting support 6, U type piece 7, feed bolt 8, connecting support 6 lower part and the cooperation of lathe guide rail 9, slide along the guide rail and can fix on the guide rail, U type piece 7 is fixed on connecting support 6, U type piece 7 center be equipped with feed bolt 8 screw thread blind hole, ribbed wallboard broken rib region 4 card is in the U type opening of U type piece 7, the laminating of U type opening face is on web face 10 of wallboard, the method of taking shape, including following step:
1. connecting an auxiliary prestress shot blasting forming tool connecting support with a lower guide rail of a machine tool, enabling a broken rib area of the ribbed wallboard to fall into a U-shaped opening of a U-shaped block, pushing the U-shaped block to press a web surface to a set pre-bending value by a feed bolt, and completing prestress clamping of the broken rib area of the ribbed wallboard;
referring to the attached drawing 1, the integral wall plate 1 of the saddle-shaped ribbed integral wall plate part before shot blasting forming needs to be subjected to rigid pre-bending through a pre-stress clamp 2, the lengths of ribs contained in the integral wall plate are inconsistent, and the rib breaking ends of the ribs are not on the same vertical plane. Fig. 3, 4 and 5 show that an operator installs a bead-breaking-area auxiliary pre-stressed shot blasting forming tool 5 in a bead-breaking area 4, the lower part of a tool connecting support 6 is matched with a machine tool guide rail 9 and is fixed on the guide rail along the guide rail in a sliding manner to realize the connection of the tool and a machine tool, the bead-breaking area 4 of the ribbed wallboard falls into a U-shaped opening of a U-shaped block 7 at the upper part of the connecting support 6, a feed bolt 8 pushes the U-shaped block 7 to compress a web surface 10 to a set pre-bending value, the pre-stress clamping of the bead-breaking area of the ribbed wallboard is completed, the condition that the appearance mutation of the bead-breaking area shown in fig. 2 is eliminated, and the smooth state of the integral wall panel pre.
2. Protecting the partial area of the outer surface of the broken rib area by using a shot blasting protection adhesive tape after prestress clamping
After the prestressing force clamping of disconnected muscle region is accomplished, carry out chord direction shot-peening shaping to disconnected muscle region, before the peening, need protect disconnected muscle region external surface part region, specific region is close to disconnected muscle head region as shown in figure 7, and specific size is as shown in the figure: the rectangular area with the width of 80mm and the length of 100mm from the center point 11 of the broken rib area to the extension of the broken rib head is protected by the shot blasting protection adhesive tape, so that the bulge appearance of the outer surface of the broken rib area after the outward chord shot blasting is prevented from influencing the overall appearance state of the broken rib area 4. Due to the special structure of the broken rib area 4, the rigidity of the ribs is suddenly reduced in the broken rib area 4, and the rigidity of the skin is far weaker than that of the ribs, so that under the prestress state of the broken rib area, the outer surface is easy to have a biconvex shape, namely a bulging trend, if the shot blasting is improper, the shape of the area is the biconvex shape, and great difficulty is brought to later-stage stretch forming and shape correction. Therefore, protection of this region before peening is important.
3. Performing chordwise shot blasting forming on the outer surface of the broken rib area
The equipment adopted in the chordwise shot-peening forming introduced by the method is a large-scale numerical control shot-peening forming machine (such as an MPR20000 numerical control shot-peening forming machine), and then a shot-peening path is designed according to the prior integral process (the chordwise shot-peening path is drawn according to a chordwise curvature cloud picture, generally, the path is consistent with the chordwise curvature trend) to carry out chordwise shot-peening forming. The selection of the shot blasting parameters needs to be made according to the curvature profile requirement of the broken rib area, the shot blasting is generally carried out at 90 degrees, the selection of parameters such as shot blasting pressure, shot flow, shot blasting distance, shot blasting speed, nozzle specification and the like is determined in an early basic test, and the matching can be carried out according to the spanwise curvature requirement.
4. Performing spanwise shot blasting forming on the inner surface of the broken rib area
After the chordwise peening is completed, the spanwise peening of the bead-broken region is required, and the peening positions are selected to peen both sides 13 of the ribs of the bead-broken region on the inner surface 12 of the panel, as shown in fig. 8. Adopt the return bend nozzle to carry out the peening to broken muscle regional rib both sides, carry out the opposite blasting to rib both sides 13 and can make rib both sides 13 to take place to warp to the spanwise direction to this obtains spanwise appearance, in addition, to spouting can prevent the deformation that the rib both sides face leads to because the peening is inhomogeneous. Fig. 8 shows the specification of an elbow nozzle 14 commonly used in this method, in which a shot distance of 80mm is an optimum shot distance.
The shot blasting parameters such as shot blasting pressure, shot blasting flow, shot blasting speed and the like are determined in the previous single-rib piece basic test, and the matching can be carried out according to the spanwise curvature requirement.
5. After the spanwise peening is accomplished, unload wallboard prestressing fixture 2, place the wallboard and carry out the appearance inspection on the appearance inspection model, if 4 appearances in disconnected muscle region laminate the inspection model completely, then need not carry out the peening school shape, otherwise, adopt ultrasonic peening machine to carry out the peening school shape to 4 inside and outside surfaces in disconnected muscle region, according to laminating state measurement judgement chord direction or the unsatisfied requirement of the outside shape of spanwise, manual control ultrasonic peening machine laminates the model step by step and carries out chord direction or spanwise school shape, to finally satisfy the requirement.
The shot peening correction is ultrasonic shot peening correction, correction parameters and regions can be adjusted at any time according to the shape attaching state, generally speaking, firstly, weakening shot peening correction is carried out on a protection region in the figure 7, the chordwise shape of the region is smooth, then the chordwise or spanwise appearance does not meet the requirement according to the attaching state, and then chordwise or spanwise correction is carried out until the requirement is finally met.
For solving the realistic problem in production, the special way of this application lies in, before novel wallboard processing, need be according to the regional supplementary prestressing force peening of disconnected muscle of the cross sectional dimension preparation corresponding structure of rib and take shape the frock, select the material that the rigidity is stronger to process the preparation to can realize its effective connection with the lathe guide rail. In actual production, when the integral panel 1 is subjected to prestress clamping, the auxiliary prestress shot-peening forming tool 5 is installed in the corresponding broken rib area 4 and is adjusted to a proper position according to the height of a rib, and meanwhile, the auxiliary prestress shot-peening forming tool 5 is fastened and connected with a machine tool guide rail 9.
It is particularly noted that in the installation process of the auxiliary pre-stress shot peening forming tool 5, the outer surface profile of the broken rib area 4 needs to be measured in time, that is, the chord span-wise outer profile of the outer surface shown in 4 in fig. 7, the chord span-wise outer profile can be accurately measured through a curvature meter, and stress concentration caused by excessive pre-bending of the broken rib area 4 is prevented.
The method is applied to practical engineering, the curvature shape of a broken rib area of a certain type machine is well obtained, and the feasibility of the method is verified.
Claims (1)
1. The utility model provides a regional prestressing force peening forming method of whole ribbed wallboard broken rib, including an auxiliary prestressing force peening forming frock, its characterized in that auxiliary prestressing force peening forming frock is including connecting support, U type piece, feed bolt, connecting support lower part and the cooperation of lathe guide rail, slide along the guide rail and can fix on the guide rail, U type piece is fixed on connecting the support, U type piece center is equipped with the screw thread blind hole with feed bolt matched with, the regional card of ribbed wallboard broken rib is in the U type opening of U type piece, the laminating of U type opening face is on the web face of ribbed wallboard, the method of shaping includes following steps:
1-1, connecting a connecting support of an auxiliary prestress shot blasting forming tool with a lower guide rail of a machine tool, enabling a broken rib area of the ribbed wallboard to fall into a U-shaped opening of a U-shaped block, and pushing the U-shaped block to press a web surface to a set pre-bending value by a feed bolt to finish prestress clamping of the broken rib area of the ribbed wallboard;
1-2, protecting the partial area of the outer surface of the broken rib area by using a shot blasting protection adhesive tape after prestress clamping;
1-3, performing chordwise shot blasting on the outer surface of the broken rib area;
1-4, performing spanwise shot blasting forming on the inner surface of the broken rib area;
1-5, after spanwise shot blasting is completed, disassembling the prestressed clamping of the wall plate, placing the ribbed wall plate on a shape inspection sample plate for shape inspection, if the shape of a broken rib area is completely attached to the inspection sample plate, shot blasting shape correction is not needed, otherwise, an ultrasonic shot blasting machine is adopted to perform shot blasting shape correction on the inner surface and the outer surface of the broken rib area, the requirement for chordwise or spanwise shape unsatisfied is judged according to the attaching state, and the ultrasonic shot blasting machine is manually controlled to gradually attach to the sample plate to perform chordwise or spanwise shape correction until the requirement is finally met.
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| CN201910268574.XA CN110026907B (en) | 2019-04-03 | 2019-04-03 | Prestressed shot blasting forming method for broken rib area of integral ribbed wallboard |
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| CN201910268574.XA CN110026907B (en) | 2019-04-03 | 2019-04-03 | Prestressed shot blasting forming method for broken rib area of integral ribbed wallboard |
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| CN110026907B true CN110026907B (en) | 2021-04-20 |
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| CN110549249A (en) * | 2019-08-02 | 2019-12-10 | 西安飞机工业（集团）有限责任公司 | Method for improving shot blasting forming rate of riveting type single-curvature wing wall plate |
| CN110666701B (en) * | 2019-09-20 | 2021-06-01 | 西安飞机工业（集团）有限责任公司 | Shot blasting forming method for small-area sharply bent biconvex ribbed wallboard |
| CN111112395B (en) * | 2020-01-03 | 2022-03-04 | 中国航空制造技术研究院 | Pre-bending tool for obtaining double-curvature wall plate and shot blasting forming process |
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| CN111715739B (en) * | 2020-06-24 | 2021-07-16 | 中国航空制造技术研究院 | Pre-bending tool for integral wall plate with ribs and shot blasting forming method |
| CN111716255B (en) * | 2020-06-24 | 2021-10-29 | 中国航空制造技术研究院 | Pre-bending tool for ribbed wallboard and shot blasting forming method |
| CN111922922A (en) * | 2020-08-26 | 2020-11-13 | 中国航空制造技术研究院 | Shot peening strengthening deformation regulating and controlling method for large-curvature biconvex integral wall plate with ribs |
| CN114011958B (en) * | 2021-11-18 | 2023-08-04 | 中国航空制造技术研究院 | Shot blasting forming method for prolonging fatigue life of ribbed integral wallboard |
| CN114643318B (en) * | 2022-03-14 | 2023-12-01 | 中国航空制造技术研究院 | Prestressing tool and shot blasting forming method for complex hyperbolic ribbed integral wallboard |
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