A method for rapidly establishing the intensity saturation curve of a shot peening target

Abstract

This invention belongs to the field of aircraft manufacturing technology and discloses a method for rapidly establishing the saturation curve of the target strength enhanced by shot peening. By selecting appropriate air pressure and shot flow rate, the efficiency of establishing the target strength saturation curve is improved, ensuring that the shot peening intensity of the saturation curve is centered within the design shot peening intensity range. This solves the technical problems of low saturation curve establishment efficiency, shot peening intensity close to the upper and lower limits of the design shot peening intensity range, and imbalance between air pressure and shot flow rate.

Description

Technical Field

[0001] This invention application belongs to the field of aircraft manufacturing - shot peening strengthening technology, specifically relating to a method for rapidly establishing the intensity saturation curve of a shot peening target. Background Technology

[0002] Shot peening is a process that uses projectiles with kinetic energy to impact the surface of metal parts, creating pits and causing plastic flow of the metal, thus generating a residual compressive stress layer. Shot peening can effectively improve the fatigue strength and stress corrosion resistance of metal parts. Shot peening intensity is a crucial factor in controlling the quality of shot peening. If the shot peening intensity is too low, the part will not achieve the required fatigue resistance. If the shot peening intensity is too high, it will reduce the surface ductility of the part, thus reducing fatigue strength. Therefore, the part design drawings specify a numerical range as the design shot peening intensity range for the part.

[0003] Shot peening intensity can only be determined by the saturation curve. When designing shot peening processes for parts, process engineers must establish a saturation curve using shot peening equipment. The saturation curve is a curve showing the relationship between shot peening time and the ALMEN arc height. Establishing a saturation curve is relatively complex. It requires obtaining the corresponding ALMEN arc height values ​​from at least four ALMEN specimens with different shot peening times, under the condition that the shot peening parameters—air pressure, shot flow rate, shot peening medium, nozzle diameter, nozzle type, shot peening angle, and shot peening distance—remain constant within the same equipment. Based on this data, the saturation curve is plotted. The point on the saturation curve where the ALMEN arc height increases by 10% when the shot peening time is doubled is the saturation point. The ALMEN arc height value corresponding to the saturation point is the shot peening intensity of the saturation curve. The shot peening intensity of the established saturation curve must be within the design shot peening intensity range. Otherwise, the shot peening parameters need to be adjusted, and the saturation curve needs to be re-established until the shot peening intensity of the saturation curve is within the design shot peening intensity range. Only then can the shot peening parameters at the saturation point of the saturation curve be used as the shot peening parameters for the processed parts.

[0004] Establishing a saturation curve is not a one-time solution. After processing equipment maintenance, shot peening pipeline replacement, or long-term wear and tear of the shot peening pipeline, the performance of the shot peening equipment will change significantly, and the original saturation curve will become invalid. Its saturation point shot peening parameters will not be used to process parts, and a new saturation curve needs to be established.

[0005] Establishing a saturation curve involves continuously adjusting shot peening parameters and building the curve until the shot peening intensity of the saturation curve falls within the designed shot peening intensity range. The key to establishing a saturation curve is determining the shot peening parameters. However, currently, there is no systematic theoretical basis for determining these parameters. Relying solely on the experience of process engineers to repeatedly adjust shot peening parameters to establish a saturation curve presents the following three problems:

[0006] (1) The saturation curve is inefficient to establish and will seriously affect the production schedule if it occupies the production equipment for a long time.

[0007] (2) Relying on experience to adjust shot peening parameters cannot guarantee that the shot peening intensity is determined in the middle range of the designed shot peening intensity range. When the shot peening intensity of the saturation curve is close to the upper or lower limit of the designed shot peening intensity range, the strength verification during part processing is likely to exceed the strength range. The saturation curve has a poor ability to adapt to changes in equipment performance, and the probability of saturation curve failure is greater.

[0008] (3) Unplanned adjustment of shot peening parameters, in order to meet the shot peening intensity requirements, often fails to consider the balance between air pressure and shot flow rate. If too high a flow rate is used to match too high a pressure for shot peening, it will result in poor surface quality of the parts after shot peening. If too low a pressure is used to match too low a flow rate for shot peening, it will result in extremely low shot peening efficiency, affecting production efficiency. Furthermore, under shot peening parameter conditions close to the equipment's limits, the equipment's working performance is unstable, and there is also a significant risk to product quality.

[0009] Therefore, there is an urgent need for a method to quickly establish the saturation curve of the shot peening target, in order to solve the problems of low efficiency in establishing the saturation curve, shot peening intensity being close to the upper and lower limits of the design shot peening intensity range, and imbalance between air pressure and shot flow rate. Summary of the Invention

[0010] This invention addresses the problems of low efficiency in establishing saturation curves, reliance on experience to adjust shot peening parameters, and unplanned adjustments to shot peening parameters in current methods. It proposes a rapid method for establishing saturation curves for shot peening to enhance target strength. By selecting appropriate air pressure and shot flow rate, the efficiency of establishing the target strength saturation curve is improved, ensuring that the shot peening intensity of the saturation curve remains within the designed shot peening intensity range.

[0011] To achieve the aforementioned objectives, the technical solution adopted in this application is as follows:

[0012] A method for rapidly establishing the intensity saturation curve of a shot-peening target includes the following steps:

[0013] Step 1: Select the median of air pressure and shot flow rate within the adjustable range of the equipment as the reference air pressure and reference shot flow rate, and obtain the reference supersaturated ALMEN arc height value by establishing the reference saturation curve.

[0014] Step 2: Select the upper and lower limits of the shot flow rate of the equipment, adjust the air pressure, shot peening the ALMEN test piece, record the ALMEN arc height value under the upper and lower limits of shot flow rate, and establish the high shot flow rate function curve and the low shot flow rate function curve.

[0015] Step 3: Establish the first function region using the above high-projectile flow function curve and low-projectile flow function curve;

[0016] Step 4: After the equipment performance changes, use the reference air pressure and reference shot flow rate to peen the ALMEN test piece to obtain the actual supersaturated ALMEN arc height value. Use the difference between the actual supersaturated ALMEN arc height value and the reference supersaturated ALMEN arc height value as the offset correction first function region. The correction first function region is the range of air pressure and supersaturated ALMEN arc height value.

[0017] Step 5: Take the median value of the designed shot peening intensity range as the target shot peening intensity, and take 1.1 times the target shot peening intensity as the target supersaturation intensity. Find the median value of the selectable range of air pressure corresponding to the target supersaturation intensity in the first function region and take it as the target air pressure. Then, determine the maximum supersaturation ALMEN arc height value, the minimum supersaturation ALMEN arc height value, and the target supersaturation ALMEN arc height value of the selectable range based on the target air pressure.

[0018] Step 6: Based on the inverse relationship between the projectile flow rate and the supersaturated ALMEN arc height, calculate the target projectile flow rate corresponding to the target supersaturated ALMEN arc height.

[0019] Step 7: Establish a saturation curve to be determined using the target air pressure and target shot flow rate; determine whether the shot peening intensity of the saturation curve to be determined is centered within the design shot peening intensity range. If yes, the saturation curve is established; if not, the saturation curve to be determined is corrected until the target intensity saturation curve is obtained.

[0020] As a further aspect of the present invention, it also includes a saturation curve failure judgment step: if the actual ALMEN arc height value obtained from the strength verification does not meet the requirements of the design drawings, then the saturation curve fails and needs to be re-established.

[0021] As a further aspect of the present invention: Step 1 specifically involves: establishing a saturation curve using a reference air pressure and a reference shot flow rate as a reference saturation curve; the shot peening intensity of the reference saturation curve is the reference shot peening intensity; the time corresponding to the saturation point of the reference saturation curve is the reference saturation time; three times the reference saturation time is called the reference oversaturation time; shot peening an ALMEN specimen using the reference oversaturation time; measuring the arc height value of the ALMEN specimen; and recording it as the reference oversaturation ALMEN arc height value.

[0022] As a further aspect of the present invention: Step 2 specifically involves: selecting the upper limit as high shot flow rate and the lower limit as low shot flow rate within the adjustable range of the equipment's shot flow rate; under both high and low shot flow rate conditions, using a reference oversaturation time, changing the air pressure within the adjustable range of the equipment's air pressure, shot peening multiple ALMEN test pieces, and measuring the arc height value of each ALMEN test piece as the oversaturated ALMEN arc height value; using air pressure as the independent variable x and the oversaturated ALMEN arc height value as the dependent variable y, fitting function curves of air pressure x versus oversaturated ALMEN arc height value y under the same coordinate system, respectively, these are called the high shot flow rate function curve and the low shot flow rate function curve, and the high shot flow rate function curve and the low shot flow rate function curve are collectively referred to as the first function curve.

[0023] As a further aspect of the present invention: Step 3 specifically involves: drawing a straight line segment parallel to the y-axis to connect the beginnings of the high-shot flow function curve and the low-shot flow function curve, and then drawing another straight line segment parallel to the y-axis to connect the ends of the high-shot flow function curve and the low-shot flow function curve. The two straight line segments, together with the high-shot flow function curve and the low-shot flow function curve, form a closed region, which is called the first function region.

[0024] As a further aspect of the present invention: Step 4 specifically involves: when a saturation curve needs to be established, using a reference air pressure, a reference shot flow rate, and a reference supersaturation time, a shot peening ALMEN specimen is used to obtain the actual supersaturated ALMEN arc height value. The difference between the actual supersaturated ALMEN arc height value and the reference supersaturated ALMEN arc height value is calculated. The difference is used as an offset, and the first function region is shifted by the offset along the y-axis direction to obtain the corrected first function region.

[0025] As a further aspect of the present invention: Step 5 specifically involves: taking the median value of the designed shot peening intensity range as the target shot peening intensity, taking 1.1 times the target shot peening intensity as the target supersaturation intensity, and denoting its value as N. A straight line y = N intersects the boundary of the modified first function region to obtain intersection points X1 and X2. The midpoint of the line connecting intersection points X1 and X2 is denoted as point A. The x-coordinate value of point A is the target air pressure, denoted as K. A straight line x = K intersects the boundary of the modified first function region to obtain intersection points Y1 and Y2. The y-coordinate values ​​of intersection points Y1 and Y2 are denoted as y1 and y2, where y2 > y1.

[0026] As a further aspect of the present invention: Step 6 specifically involves the following: Under the condition of constant air pressure, the projectile flow rate is approximately inversely proportional to the supersaturated ALMEN arc height. Therefore, with the projectile flow rate as the independent variable l and the supersaturated ALMEN arc height as the dependent variable y, a function of the form y = kl + b can be obtained using the coordinate values ​​of the intersection points Y1 and Y2. This function is called the second function. The target supersaturation intensity is then substituted into the second function as the y value to obtain the corresponding l value as the target projectile flow rate.

[0027] As a further aspect of the present invention: In step 7, the specific content of the correction method is as follows: calculate the difference Δy between the target shot peening intensity and the shot peening intensity of the undetermined saturation curve; calculate the shot flow rate difference Δl that needs to be changed if the difference Δy needs to be changed to achieve supersaturation ALMEN arc height value according to the slope k of the second function; adjust the target shot flow rate according to Δl; establish the undetermined corrected saturation curve with the target air pressure and the adjusted target shot flow rate; if the shot peening intensity of the undetermined corrected saturation curve is in the middle of the designed shot peening intensity range and meets expectations, then the undetermined saturation curve is the target intensity saturation curve; if the shot peening intensity of the undetermined corrected saturation curve still does not meet expectations, then adjust the target shot flow rate again to establish the saturation curve according to the above method until the shot peening intensity meets expectations.

[0028] As a further aspect of the present invention: for a specific device, steps 1 to 3 need to be performed only once; when a new saturation curve needs to be established, steps 4 to 7 only need to be performed.

[0029] Compared with the prior art, the beneficial effects of this application are:

[0030] 1. By establishing a baseline saturation curve, a baseline supersaturated ALMEN arc height value is obtained, which is then used as a benchmark to measure equipment performance. When equipment performance changes, the difference between the actual supersaturated ALMEN arc height value and the baseline supersaturated ALMEN arc height value is used as the offset to correct the first function region. This quickly compensates for the impact of changes in equipment performance on the first function region. It avoids blindly selecting shot peening parameters when establishing the undetermined saturation curve without understanding the changed equipment performance.

[0031] 2. The saturation curve shot peening intensity can be obtained directly through the approximate conversion relationship of 1.1 times between the supersaturated ALMEN arc height value and the saturation curve shot peening intensity. This can save the process of establishing the saturation curve multiple times, greatly improve the speed of establishing the first function curve, and improve the speed of determining the target air pressure and the target projectile flow rate.

[0032] 3. First, determine the target air pressure and target shot flow rate based on the first modified function region to ensure that the shot peening intensity of the undetermined saturation curve is within the design shot peening intensity range. Then, adjust the target shot flow rate according to the second function to correct the shot peening intensity of the undetermined saturation curve to be centered within the design shot peening intensity range, thus obtaining the undetermined corrected saturation curve. This method of establishing the target intensity saturation curve is highly efficient, ensures that the shot peening intensity of the saturation curve is centered within the design shot peening intensity range, and makes it less likely for the strength verification during part processing to exceed the limit. Furthermore, the saturation curve has good adaptability to changes in equipment performance.

[0033] 4. The modified first function region comprehensively displays the relationship between the current equipment air pressure and shot flow rate and the supersaturated ALMEN arc height. When selecting the target air pressure and target shot flow rate, the modified first function region provides a holistic view of all possible air pressures and shot flow rates that could establish the target intensity saturation curve. The median of all air pressures is selected as the target air pressure, and then the shot flow rate matching the target air pressure is determined based on the second function. This parameter determination method ensures that the target air pressure and target shot flow rate are within the middle range of the equipment's adjustable parameters. The equipment operates stably within the middle range of adjustable parameters. This parameter determination method also effectively balances the relationship between the target air pressure and the target shot flow rate, achieving a balance between part surface quality and shot peening efficiency.

[0034] The present application will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0035] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0036] In the attached diagram:

[0037] Figure 1 This is the reference saturation curve for this invention;

[0038] Figure 2 This is the first function region of the present invention;

[0039] Figure 3 The first function region is modified for this invention;

[0040] Figure 4 This is the saturation curve to be determined in this invention;

[0041] Figure 5 This is the saturation curve to be corrected in this invention. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] like Figure 1-5 The illustration shows an embodiment of this invention. Assuming the design shot peening intensity range for a certain part is 0.25 mmA to 0.35 mmA, the following describes a method for rapidly establishing a shot peening target intensity saturation curve, using a specific method for establishing the target intensity saturation curve with a certain device:

[0044] This equipment uses a 10mm nozzle diameter, a straight nozzle type, and ASH230 hard cast steel shot as the peening medium. The shot peening process for the parts requires a peening angle of 45° and a peening distance of 500mm. These peening parameters remain constant during the establishment of the saturation curve.

[0045] Step 1: The adjustable air pressure range of the equipment is 0.1MPa~0.45MPa, and the shot flow rate is 6KG~14KG. Selecting the median, we obtain a reference air pressure of 0.275MPa and a reference shot flow rate of 10kg. Establish a reference saturation curve using the reference air pressure of 0.275MPa and the reference shot flow rate of 10kg, as shown below. Figure 1 The baseline shot peening intensity was determined to be 0.231 mmA using the baseline saturation curve. The baseline saturation time of the baseline saturation curve was 7.30 s, therefore the baseline oversaturation time was 21.9 s. Using an ALMEN specimen peened with the baseline oversaturation time of 21.9 s, the arc height of the ALMEN specimen was measured, yielding a baseline oversaturated ALMEN arc height of 0.256 mmA.

[0046] Step 2: Within the adjustable range of the equipment, select an upper limit of 14KG as the high shot flow rate and a lower limit of 6KG as the low shot flow rate. Under the conditions of high shot flow rate of 14KG and low shot flow rate of 6KG, use a reference oversaturation time of 21.9S for shot peening. Increase the air pressure in increments of 0.05MPa within the adjustable range of 0.1MPa to 0.45MPa, shot peening eight ALMEN specimens, and measure and record the arc height value of the ALMEN specimens as the oversaturated ALMEN arc height value. With air pressure as the independent variable x and the oversaturated ALMEN arc height value as the dependent variable y, fit the function curves of air pressure x and oversaturated ALMEN arc height value y under the conditions of high shot flow rate and low shot flow rate using a quadratic polynomial in the same coordinate system. The function curve for high shot flow rate is as follows:

[0047] y = -1.4143x2 +1.2269x-0.0086, the low-projectile flow rate function curve is:

[0048] y = -2.0024x 2 +1.7354x-0.0116, together, are called the first function curve.

[0049] Step 3: Draw a straight line segment parallel to the y-axis connecting the beginnings of the high-shot and low-shot flow function curves. Then draw another straight line segment parallel to the y-axis connecting the ends of the high-shot and low-shot flow function curves. These two line segments, along with the high-shot and low-shot flow function curves, form a closed region. This closed region is called the first function region, as shown below. Figure 2 .

[0050] Step 4: When establishing the saturation curve, use a reference air pressure of 0.275 MPa, a reference shot flow rate of 10 kg, and a reference oversaturation time of 21.9 s for the shot peening ALMEN specimen to obtain the actual oversaturated ALMEN arc height value of 0.275 mmA. Calculate the difference between the actual oversaturated ALMEN arc height value of 0.275 and the reference oversaturated ALMEN arc height value of 0.256 mmA, and use the difference of 0.019 mmA as the offset. Shift the first function region along the y-axis by the offset to obtain the corrected first function region.

[0051] Step 5: Take the midpoint of the designed shot peening intensity range, 0.30 mmA, as the target shot peening intensity. Take 1.1 times the target shot peening intensity as the target supersaturation intensity, with a value of 0.33 mmA. Draw a straight line y = 0.33 intersecting the boundary of the modified first function region to obtain intersection points X1 and X2. Record the midpoint of the line connecting intersection points X1 and X2 as point A; the x-coordinate of point A is the target air pressure, with a value of 0.345 MPa. Draw a straight line x = 0.345 intersecting the boundary of the modified first function region to obtain intersection points Y1 and Y2, as follows... Figure 3 Let the y-coordinates of the intersection points Y1 and Y2 be y1 and y2, respectively, where y2 > y1. y1 is 0.235 and y2 is 0.385.

[0052] Step 6: Because the projectile flow rate is approximately inversely proportional to the supersaturated ALMEN arc height under constant air pressure, we take the projectile flow rate as the independent variable *l* and the supersaturated ALMEN arc height as the dependent variable *y*. Using the coordinates of intersection points Y1 and Y2, we obtain the second function: y = -0.01875l + 0.4975. Substituting the target supersaturated intensity *y* = 0.33 mmA into the second function, we obtain the corresponding projectile flow rate as *l* = 8.93 kg, meaning the target projectile flow rate is 8.93 kg.

[0053] Step 7: Establish the undetermined saturation curve using a target air pressure of 0.345 MPa and a target projectile flow rate of 8.93 kg, as shown below. Figure 4 The shot peening intensity of the undetermined saturation curve is 0.286 mmA, which is not in the center of the designed shot peening intensity range and still needs to be adjusted. Proceed to step 8.

[0054] Step 8: The difference Δy between the target shot peening intensity of 0.30 mmA and the shot peening intensity of 0.286 mmA on the undetermined saturation curve is 0.014 mmA. The slope of the second function is -0.01875, therefore, the shot flow rate difference Δl required to change by 0.014 mmA in the supersaturated ALMEN arc height is -0.75 MPa. Therefore, the target shot flow rate is adjusted to 8.18 kg. An undetermined corrected saturation curve is established using the target air pressure of 0.345 MPa and the target shot flow rate of 8.18 kg, as follows. Figure 5 The shot peening intensity of the undetermined saturation curve is 0.298 mmA, which is in the middle of the designed shot peening intensity range and meets expectations. The undetermined saturation curve is the target intensity saturation curve, and the saturation curve has been established.

[0055] Thus, the objective of this invention has been achieved.

[0056] The above are merely 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 within the protection scope of the present invention.

Claims

1. A method for rapidly establishing the intensity saturation curve of a shot-peening target, characterized in that, Includes the following steps: Step 1: Select the median of air pressure and shot flow rate within the adjustable range of the equipment as the reference air pressure and reference shot flow rate, and obtain the reference supersaturated ALMEN arc height value by establishing the reference saturation curve. Step 2: Select the upper and lower limits of the shot flow rate of the equipment, adjust the air pressure, shot peening the ALMEN test piece, record the ALMEN arc height value under the upper and lower limits of shot flow rate, and establish the high shot flow rate function curve and the low shot flow rate function curve. Step 3: Establish the first function region using the above high-projectile flow function curve and low-projectile flow function curve; Step 4: After the equipment performance changes, use the reference air pressure and reference shot flow rate to peen the ALMEN test piece to obtain the actual supersaturated ALMEN arc height value. Use the difference between the actual supersaturated ALMEN arc height value and the reference supersaturated ALMEN arc height value as the offset correction first function region. The correction first function region is the range of air pressure and supersaturated ALMEN arc height value. Step 5: Take the median value of the designed shot peening intensity range as the target shot peening intensity, and take 1.1 times the target shot peening intensity as the target supersaturation intensity. Find the median value of the selectable range of air pressure corresponding to the target supersaturation intensity in the first function region and take it as the target air pressure. Then, determine the maximum supersaturation ALMEN arc height value, the minimum supersaturation ALMEN arc height value, and the target supersaturation ALMEN arc height value of the selectable range based on the target air pressure. Step 6: Based on the inverse relationship between the projectile flow rate and the supersaturated ALMEN arc height, calculate the target projectile flow rate corresponding to the target supersaturated ALMEN arc height. Step 7: Establish a saturation curve to be determined using the target air pressure and target shot flow rate; determine whether the shot peening intensity of the saturation curve to be determined is centered within the design shot peening intensity range. If yes, the saturation curve is established; if not, the saturation curve to be determined is corrected until the target intensity saturation curve is obtained.

2. The method for rapidly establishing the intensity saturation curve of a shot-peening target according to claim 1, characterized in that, It also includes a saturation curve failure judgment step: if the actual ALMEN arc height value obtained from the strength verification does not meet the requirements of the design drawings, the saturation curve fails and needs to be re-established.

3. The method for rapidly establishing the intensity saturation curve of a shot-peening strengthened target according to claim 1, characterized in that, Step 1 is as follows: Establish a saturation curve using the reference air pressure and reference shot flow rate as the reference saturation curve. The shot peening intensity of the reference saturation curve is the reference shot peening intensity. The time corresponding to the saturation point of the reference saturation curve is the reference saturation time. Three times the reference saturation time is called the reference oversaturation time. Use the reference oversaturation time to peen an ALMEN specimen and measure the arc height value of the ALMEN specimen, which is recorded as the reference oversaturation ALMEN arc height value.

4. The method for rapidly establishing the intensity saturation curve of a shot-peening target according to claim 2, characterized in that, Step 2 is as follows: Within the adjustable range of the shot flow rate of the equipment, select the upper limit as high shot flow rate and the lower limit as low shot flow rate. Under high and low shot flow rate conditions, using the reference oversaturation time, change the air pressure within the adjustable range of the equipment air pressure, shot peening multiple ALMEN test pieces, and measuring the arc height value of each ALMEN test piece as the oversaturated ALMEN arc height value. With air pressure as the independent variable x and the oversaturated ALMEN arc height value as the dependent variable y, fit the function curves of air pressure x and oversaturated ALMEN arc height value y under the high and low shot flow rate conditions in the same coordinate system. These are called the high shot flow rate function curve and the low shot flow rate function curve, respectively. The high shot flow rate function curve and the low shot flow rate function curve are collectively referred to as the first function curve.

5. The method for rapidly establishing the intensity saturation curve of a shot-peening target according to claim 4, characterized in that, Step 3 is as follows: Draw a straight line segment parallel to the y-axis to connect the beginnings of the high-shot flow function curve and the low-shot flow function curve. Then draw another straight line segment parallel to the y-axis to connect the ends of the high-shot flow function curve and the low-shot flow function curve. The two straight line segments, together with the high-shot flow function curve and the low-shot flow function curve, form a closed region. This closed region is called the first function region.

6. The method for rapidly establishing the intensity saturation curve of a shot-peening target according to claim 5, characterized in that, Step 4 specifically involves: when a saturation curve needs to be established, using the reference air pressure, reference shot flow rate, and reference supersaturation time, the ALMEN specimen is peened to obtain the actual supersaturated ALMEN arc height value. The difference between the actual supersaturated ALMEN arc height value and the reference supersaturated ALMEN arc height value is calculated. This difference is used as the offset, and the first function region is shifted along the y-axis by the offset to obtain the corrected first function region.

7. The method for rapidly establishing the intensity saturation curve of a shot-peening strengthened target according to claim 6, characterized in that, Step 5 is as follows: Take the median value of the designed shot peening intensity range as the target shot peening intensity, and take 1.1 times the target shot peening intensity as the target supersaturation intensity, denoted as N. Draw a straight line y = N and intersect it with the boundary of the modified first function region to obtain intersection points X1 and X2. Denote the midpoint of the line connecting intersection points X1 and X2 as point A. The x-coordinate value of point A is the target air pressure, denoted as K. Draw a straight line x = K and intersect it with the boundary of the modified first function region to obtain intersection points Y1 and Y2. Denote the y-coordinate values ​​of intersection points Y1 and Y2 as y1 and y2, where y2 > y1.

8. The method for rapidly establishing the intensity saturation curve of a shot-peening target according to claim 7, characterized in that, Step 6 is as follows: Under constant air pressure, the projectile flow rate is approximately inversely proportional to the supersaturated ALMEN arc height. Therefore, with the projectile flow rate as the independent variable l and the supersaturated ALMEN arc height as the dependent variable y, a function of the form y = kl + b can be obtained using the coordinate values ​​of the intersection points Y1 and Y2. This function is called the second function. The target supersaturation intensity is substituted into the second function as the y value to obtain the corresponding l value as the target projectile flow rate.

9. The method for rapidly establishing the intensity saturation curve of a shot-peening target according to claim 8, characterized in that, In step 7, the specific content of the correction method is as follows: calculate the difference Δy between the target shot peening intensity and the shot peening intensity of the undetermined saturation curve; calculate the shot flow rate difference Δl that needs to be changed if the difference Δy needs to be changed to achieve supersaturation ALMEN arc height value according to the slope k of the second function; adjust the target shot flow rate according to Δl; establish the undetermined corrected saturation curve with the target air pressure and the adjusted target shot flow rate; if the shot peening intensity of the undetermined corrected saturation curve is in the middle of the design shot peening intensity range and meets the expectations, then the undetermined saturation curve is the target intensity saturation curve; if the shot peening intensity of the undetermined corrected saturation curve still does not meet the expectations, then adjust the target shot flow rate again to establish the saturation curve according to the above method until the shot peening intensity meets the expectations.

10. A method for rapidly establishing the intensity saturation curve of a shot-peening target according to any one of claims 1-9, characterized in that, For a specific device, steps 1 through 3 need to be performed only once; when a new saturation curve needs to be established, only steps 4 through 7 need to be performed.

Images