Shot blasting correction method for chord-direction appearance out-of-tolerance of wallboard parts

Abstract

The invention belongs to the technical field of shot peening forming, and discloses a shot peening correction method for chord-direction appearance out-of-tolerance of a wallboard part, which comprises the following steps of: dividing a wallboard thickness area; measuring out-of-tolerance data, and drawing a wallboard appearance out-of-tolerance chart; a shot blasting shape correction area is determined according to the out-of-tolerance degree; according to the wall plate thickness and the out-of-tolerance data, parameters of a shot blasting correction machine tool are determined; pre-shot-blasting protection is conducted on a non-shot-blasting area of the part; and machine tool shot blasting and sizing. The technical problems that an existing shape correcting mode is low in efficiency and accuracy, depends on artificial experience and the like are solved. According to the invention, accurate identification and correction of the chordwise appearance out-of-tolerance of the wallboard are realized.

Description

Technical Field

[0001] The invention belongs to the field of shot peening forming technology, and specifically relates to a shot peening correction method for wall panel parts with out-of-tolerance chordal shape. Background Art

[0002] As an important part of the aircraft structure, the manufacturing quality of the wing panel is directly related to the safety performance and flight life of the aircraft. As an advanced special processing technology for aircraft sheet metal, shot peening plays a key role in the manufacturing of wing panels. This technology uses high-speed tiny projectiles to precisely impact the metal surface, inducing plastic deformation of the material surface, thereby achieving precise forming of complex shapes and enhancing the strength and fatigue life of the material.

[0003] However, the complexity of shot peening technology cannot be ignored. The key lies in how to accurately control a series of interrelated process parameters to ensure the stability of the forming process and the accuracy of the results. These parameters include but are not limited to shot peening pressure, shot size, injection angle and shot peening speed. The selection and regulation of these parameters not only requires extremely high technical precision, but also needs to consider many factors such as material properties, wall panel structural characteristics and final forming requirements. Any slight deviation may have a significant impact on the forming accuracy.

[0004] In practical applications, due to the mutual influence and constraints between these process parameters, it is often necessary to determine the best parameter combination through a large number of tests and optimizations. However, even so, it is still difficult to completely avoid forming defects caused by improper parameter settings, such as problems such as out-of-tolerance chordal shape of the wall panel. Usually, for problems such as out-of-tolerance siding shape, it mainly relies on manual experience to conduct multiple trial and error and correction of the wall panel, which is not only inefficient and costly, but also difficult to ensure the consistency of forming quality. In addition, due to the inaccuracy of the correction, workers are required to perform manual correction, which not only places high demands on the workers' skill level, but also further increases the manufacturing cost and uncertainty.

[0005] In order to overcome these limitations, it is necessary to develop a more accurate and efficient calibration method to accurately identify and correct the chordal shape deviation of the wall panel. The invention is proposed based on this urgent need, providing a reliable parameter selection method for the chordal shape deviation problem of the wall panel, improving the stability and accuracy of the calibration results, and also helping to reduce manufacturing costs, improve production efficiency, and promote the further development and wide application of shot peening technology. Summary of the invention

[0006] In order to solve the technical problems of low efficiency, low accuracy and reliance on manual experience in existing correction methods, the present invention proposes a shot peening correction method for chord-wise shape deviations of wall panel parts, thereby achieving accurate identification and correction of chord-wise shape deviations of wall panels.

[0007] In order to achieve the above invention objectives, the technical solutions adopted in this application are as follows:

[0008] A shot peening correction method for wall panel parts with chordal shape deviation, comprising the following steps:

[0009] Step 1: Divide the wall panel thickness area;

[0010] Step 2: Measure the tolerance data and draw a wall panel shape tolerance chart;

[0011] Step 3: Determine the shot peening correction area according to the degree of deviation;

[0012] Step 4: Determine the parameters of the shot peening machine tool based on the wall panel thickness and tolerance data;

[0013] Step 5: Protect the non-shot peening area of ​​the part before shot peening;

[0014] Step 6: Shot peening of machine tools for correction.

[0015] As a further solution of the present invention: Step 1 is specifically: by performing geometric analysis on the wing panel, the panel is divided into a thickness zone less than 2 mm, a thickness zone of 2 to 5 mm, and a thickness zone greater than 5 mm according to thickness.

[0016] As a further solution of the present invention: the step 2 is specifically: placing the wing panel with chord-wise shape deviation after shot peening on a jig, recording the maximum value of the gap between the panel and the template at the contour boundary of each rib position, and the position of the fitting area, and drawing a shape deviation chart; a chord-wise template is provided at each rib position on the jig, and its shape is consistent with the theoretical chord-wise shape of the panel.

[0017] As a further solution of the present invention: the specific step 3 is: determining the length range of the wall panel shape deviation through the tooling jig, that is, the shot peening correction length range, and the width range is the entire wall panel width, excluding the wall panel edge sinking area that differs from the surrounding web thickness by more than 2 mm.

[0018] As a further solution of the present invention: in step 4, the shot medium is selected according to the maximum value of the excess difference between the wall plate thickness and the shape gap, specifically:

[0019] When the wall thickness is greater than 5mm, large-sized projectiles can be used (the type of shaped projectiles is consistent with the type of chord-wise shot peening);

[0020] When the wall thickness is between 2 and 5 mm, the shot medium is determined according to the maximum value of the wall thickness gap tolerance. When the maximum value of the gap tolerance is greater than 5 cm, large-sized shot can be used (the type of correction shot is consistent with the type of chord-wise shot peening); when the maximum value of the gap tolerance is greater than 2 cm and less than 5 cm, small-sized shot can be used (the type of correction shot is consistent with the type of chord-wise shot peening); when the maximum value of the gap tolerance is less than 2 cm, an ultrasonic correction machine is used for manual shot peening correction;

[0021] When the wall panel thickness is less than 2mm, use a rotary vane for manual shot peening and correction. The rotary vane shot peening speed is generally 5000-6500r / min.

[0022] As a further solution of the present invention: the shot peening pressure of the large-sized projectiles is generally selected to be 0.6 to 0.9 times the chordal shot peening pressure, and the shot peening pressure of the small-sized projectiles is generally selected to be 1 to 1.5 times the chordal shot peening pressure; the machine tool shot peening speed is selected to be 6 to 10 m / min.

[0023] As a further solution of the present invention: Step 5 is specifically as follows: for unreinforced wall panels, it is necessary to protect the edges of the wall panels, the thin web area with a thickness less than 2mm, and the web sunken area with a thickness difference of more than 2mm from the surrounding webs; for reinforced wall panels, it is necessary to protect the top of the vertical ribs, the rib root R area, the web sunken area, and the edges.

[0024] As a further solution of the present invention: Step 6 is specifically as follows: the wall panel is hung and clamped on the machine tool fixture, with the front beam of the part facing upward and the rear beam facing downward, and attention is paid to keeping the ribs of the ribbed wall panel horizontal, and it is clamped in a free state without applying prestress, and the shaping area is reversely shot peened using established shot peening parameters.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] 1. The present invention achieves accurate correction of the chordal shape of the wall panel by more accurately controlling the shot peening shaping parameters, thereby reducing rework and scrapping caused by insufficient forming accuracy, thereby reducing production costs.

[0027] 2. Traditional methods often rely on empirical adjustments and multiple trials and errors, and require high operator experience. However, the present invention reduces the reliance on manual experience, reduces production delays and cost increases caused by lack of experience, and improves the stability and reliability of the production process.

[0028] 3. The present invention reduces multiple trial and error processes caused by improper selection of shaping parameters by accurately identifying the degree of wall panel deviation and controlling shot peening shaping parameters, thereby shortening the production cycle and improving production efficiency.

[0029] 4. In summary, the present invention has many advantages such as improving production efficiency, improving forming accuracy, reducing dependence on manual experience, etc., and significantly reduces manufacturing costs compared to the prior art. These advantages make the present invention have broad application prospects and market competitiveness in the aerospace manufacturing industry.

[0030] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0032] In the attached picture:

[0033] Figure 1 A schematic diagram of thickness zones of wall panel parts provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a wall panel component and a tooling jig provided in an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the chord-wise shape tolerance of wall panel parts provided in an embodiment of the present invention.

[0036] Explanation of the numbers in the figure: 1 chordal sample, 2 siding whose chordal shape fits the sample after shot peening, 3 siding whose chordal shape exceeds the tolerance after shot peening. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] The purpose of the present invention is to provide a shot peening correction method for siding-type parts with out-of-tolerance chordal shape, which can solve the problem that the siding-type parts have out-of-tolerance chordal shape after forming and affect delivery due to improper selection of shot peening parameters.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The present application embodiment takes a certain wall panel part as an example, and the thickness of the whole part varies in the range of 1 to 8 mm. Figure 1 As shown, the specific steps are as follows:.

[0041] Step 1: Divide the wall panel thickness area.

[0042] The wing panels are geometrically analyzed and divided into the following three areas: less than 2 mm thick, 2-5 mm thick, and greater than 5 mm thick, as shown in Table 1.

[0043] Table 1 Wall thickness division (unit: mm)

[0044] Rib 0～17 17～20 20～22 22～28 thickness Greater than 5 2～5 Greater than 5 Less than 2

[0045] Step 2: Measure the deviation data and draw a deviation chart of the wall panel shape.

[0046] The wing panel with out-of-tolerance panel shape after shot peening is placed on the jig. A chord-wise template is set at each rib position on the jig, such as Figure 2 As shown, its shape matches the theoretical chord shape of the wall panel. Record the maximum value of the gap between the wall panel and the sample at the contour boundary of each rib position, as well as the location of the fitting area, and draw a shape deviation chart.

[0047] Table 2 Diagram of chord shape deviation of wall panels (unit: cm)

[0048]

[0049]

[0050] Step 3: Determine the shot peening correction area based on the degree of deviation.

[0051] The shot peening correction surface is the inner surface of the wing panel. For the area where the panel thickness is less than 2mm, the machine tool is not used for shot peening correction. The length range of shot peening correction is determined by thickness, ranging from 0 ribs to 22 ribs, and the width range is the entire panel width, excluding the panel edge depression area that differs from the surrounding web thickness by more than 2mm.

[0052] Step 4: Determine the shot peening machine parameters based on the wall panel thickness and tolerance data.

[0053] The choice of shot medium can be determined according to the maximum value of the gap between the wall thickness and the shape. For the area where the wall thickness is greater than 5mm, that is, 0 ribs to 17 ribs and 20 to 22 ribs, ASH460 shot is used for shot peening. For the area where the wall thickness is between 2 and 5mm, the shot medium is determined according to the maximum value of the gap between the wall thickness and the shape. For the area where the maximum value of the gap between the 17 and 20 ribs of the wall is greater than 2cm and less than 5cm, ASH230 shot is used. For the area where the wall thickness is less than 2mm, a rotary vane is used for manual shot peening and the rotary vane shot peening speed is selected to be 5000r / min.

[0054] The ASH460 shot peening pressure is selected to be 0.8 times of the chordal shot peening pressure, that is, the 0-17 rib shot peening pressure is 0.12MPa, and the 20-22 rib shot peening pressure is 0.16MPa. The ASH230 shot peening pressure is selected to be 1.2 times of the chordal shot peening pressure, that is, the 17-20 rib shot peening pressure is 0.16MPa.

[0055] The machine speed is selected as 6m / min.

[0056] Step 5: Protect the non-shot peening area of ​​the part before shot peening.

[0057] For unreinforced wall panels, it is necessary to protect the edges of the wall panels, thin web areas with a thickness of less than 2mm, and web depression areas that differ in thickness from the surrounding webs by more than 2mm. For reinforced wall panels, it is necessary to protect the top of the vertical reinforcement, the R area at the root of the reinforcement, the web depression area, and the edges.

[0058] Step 6: Shot peening and shaping of machine tools.

[0059] Hang and clamp the wall panel on the machine tool fixture, with the front beam of the part facing up and the rear beam facing down. Note that the ribbed wall panel should keep the ribs horizontal. Clamp it in a free state without applying prestress. Use the established shot peening parameters to perform reverse shot peening on the correction area.

[0060] So far, the purpose of the present invention has been achieved.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shot peening correction method for wall panel parts with chordal shape deviation, characterized in that: The steps include: Step 1: Divide the wall panel thickness area; Step 2: Measure the tolerance data and draw a wall panel shape tolerance chart; Step 3: Determine the shot peening correction area according to the degree of deviation; Step 4: Determine the parameters of the shot peening machine tool based on the wall panel thickness and tolerance data; Step 5: Protect the non-shot peening area of ​​the part before shot peening; Step 6: Shot peening of machine tools for correction.

2. A shot peening correction method for chord-wise shape deviation of wall panel parts according to claim 1, characterized in that: The step 1 specifically includes: by geometrically analyzing the wing panels, the panels are divided into a thickness zone of less than 2 mm, a thickness zone of 2 to 5 mm, and a thickness zone of more than 5 mm according to thickness.

3. The shot peening correction method for the chordal shape out-of-tolerance of wall panel parts according to claim 1 is characterized in that: The step 2 is specifically as follows: placing the wing panel with chord-wise shape deviation after shot peening on a jig, recording the maximum value of the gap between the panel and the template at the contour boundary of each rib position, and the position of the fitting area, and drawing a shape deviation chart; a chord-wise template is provided at each rib position on the jig, and its shape is consistent with the theoretical chord-wise shape of the panel.

4. The shot peening correction method for chord-wise shape deviation of wall panel parts according to claim 1 is characterized in that: The step 3 is specifically as follows: determining the length range of the wall panel shape deviation through the tooling jig, that is, the shot peening correction length range, and the width range is the entire wall panel width, excluding the wall panel edge sinking area that differs from the surrounding web thickness by more than 2 mm.

5. The shot peening correction method for the chordal shape out-of-tolerance of wall panel parts according to claim 3 is characterized in that: In step 4, the shot medium is selected according to the maximum value of the wall plate thickness and the shape gap deviation, specifically: When the wall thickness is greater than 5 mm, large-sized projectiles can be used; When the wall thickness is between 2 and 5 mm, the shot medium is determined according to the maximum value of the gap tolerance of the wall thickness. When the maximum value of the gap tolerance is greater than 5 cm, large-sized shot can be used; when the maximum value of the gap tolerance is greater than 2 cm and less than 5 cm, small-sized shot can be used; when the maximum value of the gap tolerance is less than 2 cm, an ultrasonic shaper is used for manual shot peening and shape correction; When the wall panel thickness is less than 2mm, use a rotary vane for manual shot peening and correction. The rotary vane shot peening speed is generally 5000-6500r / min.

6. A shot peening correction method for chord-wise shape deviation of wall panel parts according to claim 5, characterized in that: The peening pressure of the large-sized projectiles is generally selected to be 0.6 to 0.9 times of the chordal peening pressure, and the peening pressure of the small-sized projectiles is generally selected to be 1 to 1.5 times of the chordal peening pressure; the peening speed of the machine tool is selected to be 6 to 10 m / min.

7. The shot peening correction method for chord-wise shape deviation of wall panel parts according to claim 1 is characterized in that: The step 5 is specifically as follows: for unreinforced wall panels, it is necessary to protect the edges of the wall panels, the thin web area with a thickness of less than 2 mm, and the web sunken area with a thickness difference of more than 2 mm from the surrounding webs; for reinforced wall panels, it is necessary to protect the top of the vertical ribs, the rib root R area, the web sunken area, and the edges.

8. The shot peening correction method for chord-wise shape deviation of wall panel parts according to claim 1 is characterized in that: The step 6 is specifically as follows: hang and clamp the wall panel on the machine tool fixture, with the front beam of the part facing upward and the rear beam facing downward, pay attention to keeping the ribs of the ribbed wall panel horizontal, clamp it in a free state, do not apply prestress, and use the established shot peening parameters to perform reverse shot peening on the correction area.

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