CN112609066B - Curved surface uniform strengthening method based on single-point double oblique incidence laser impact - Google Patents
Curved surface uniform strengthening method based on single-point double oblique incidence laser impact Download PDFInfo
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Abstract
The invention discloses a curved surface uniform strengthening method based on single-point double oblique incidence laser impact, which comprises the following steps of: when the laser shock processing is carried out on the member to be processed with the two-dimensional curved surface, the pulse laser beam is firstly irradiated to the member to be processed at a first incident angle, then the pulse laser beam is irradiated to the member to be processed at a second incident angle, and the two pulse laser beams are respectively kept perpendicular to the two ends of the member to be processed, so that the sum of the action intensities of the two laser shock processing received by any position of the member to be processed is the same, and further the uniform laser shock strengthening processing of the single beam of the curved surface to be processed is realized.
Description
Technical Field
The invention belongs to the technical field of curved surface impact reinforcement, and particularly relates to a curved surface uniform reinforcement method based on single-point double oblique incidence laser impact.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The surfaces of structures such as an aircraft engine blade, a turbine disc mortise and the like are generally non-planar, and if the curved surface structure is subjected to strengthening treatment by adopting laser beams with unchanged energy distribution, the stress on the surface to be processed is uneven, and even the stress concentration phenomenon of a partial area is caused. How to realize the equal-intensity laser shock peening of a curved surface structure is a technical problem which needs to be solved by the technical personnel in the field at present.
At present, the prior art proposes to modify the energy distribution of the light beam to enable the part to be strengthened to obtain equal power density processing under the laser incidence condition, so as to complete the equal-intensity laser shock strengthening of the material and obtain better uniform laser shock strengthening effect. However, the inventors have found that the above method employs a pulsed laser maintaining a specific laser energy distribution pattern for a specific curved surface area, which is very demanding for laser shock equipment systems, especially for high performance lasers. In the actual industrial production process, the adjustment of the energy distribution of the pulse laser single beam is difficult to realize, and the technical approach of matching the energy distribution mode according to the shape characteristics facing the uniform laser surface treatment of the curved surface structure has higher application limitation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a curved surface uniform strengthening method based on single-point double oblique incidence laser impact.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for uniformly strengthening a curved surface based on single-point double oblique incidence laser shock, including the following steps:
when the laser shock processing is carried out on the member to be processed with the two-dimensional curved surface, the pulse laser beam is firstly irradiated to the member to be processed at a first incident angle, then the pulse laser beam is irradiated to the member to be processed at a second incident angle, and the two pulse laser beams are respectively kept perpendicular to the two ends of the member to be processed, so that the sum of the action intensities of the two laser shock processing received by any position of the member to be processed is the same, and further the uniform laser shock strengthening processing of the single beam of the curved surface to be processed is realized.
As a further technical scheme, before laser shock treatment, a part to be processed is selected on the two-dimensional curved surface of the component to be processed, and protection treatment is carried out on a non-processing area of the two-dimensional curved surface.
As a further technical solution, the protection processing includes: the edge region of the region to be processed is coated with a plurality of layers of absorbent layer material.
As a further technical scheme, when the pulse laser beam is at a first incident angle, the pulse laser beam keeps a vertical incident relation with one end of a part to be processed of a component to be processed; and when the pulse laser beam is at the second incident angle, the pulse laser beam keeps a vertical incident relation with the other end of the part to be processed of the component to be processed.
As a further technical scheme, before laser shock treatment, a single-layer absorption layer is coated on a part to be processed, then a member to be processed is clamped, and a constraint layer material is coated on the surface of the member to be processed.
As a further technical scheme, the material of the constraint layer is deionized water.
As a further technical scheme, when the component to be processed is subjected to laser shock treatment by adopting the square light spot pulse laser beam, two sides of the transmission path direction of the square light spot, which correspond to the edge of the surface to be processed, are parallel to the normal direction of the edge position of the surface of the component to be processed.
As a further technical scheme, if the material of the component to be processed is stainless steel or high-temperature alloy, the two-dimensional curved surface of the component to be processed has a length of not more than 50m-1And the radian of the two-dimensional curved surface is not more than 20 degrees.
As a further technical scheme, if the material of the component to be processed is aluminum alloy or titanium alloy, the two-dimensional curved surface of the component to be processed has a length of not more than 100m-1And the radian of the two-dimensional curved surface is not more than 45 degrees.
As a further technical scheme, the shape function of the two-dimensional curved surface of the component to be processed has no second derivative zero point.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
according to the method, the flat-top laser energy distribution pulse laser uniform strengthening treatment is realized by performing impact treatment on the component to be processed at different angles twice, the dependence of curved surface uniform laser impact on high-performance laser equipment is effectively avoided, the uniformity of impact strength in the distribution of a curved surface structure is enhanced through a technical improvement way, and the curved surface distribution consistency of surface integrity parameters such as residual stress is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic flow diagram of a method for uniform reinforcement of curved surfaces according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic view of a two-dimensionally curved surface to be machined component of the present disclosure in accordance with one or more embodiments;
FIG. 3 is a schematic view of a portion of a member to be machined according to one or more embodiments of the present disclosure;
FIG. 4 is a schematic view of a single point fixed angle laser shock treatment of a member to be machined;
FIG. 5 is a schematic diagram of a distribution state of a residual stress field of a curved surface of a material introduced by single-point impact at a fixed angle;
FIG. 6 is a schematic diagram of a first oblique incidence laser beam mode when a curved surface member to be processed is subjected to single-point double oblique incidence laser shock treatment;
FIG. 7 is a schematic diagram of a second oblique incidence laser beam during single-point double oblique incidence laser shock processing of a curved surface member to be processed;
FIG. 8 is a schematic diagram of the distribution state of the residual stress field of a curved surface of a material introduced by two single-point impacts at different angles;
FIG. 9 is a schematic view of a single-point fixed angle laser shock treatment of an aluminum alloy curved surface member to be processed;
FIG. 10 is a schematic diagram of a first oblique incidence laser mode when a single-point double oblique incidence laser impacts an aluminum alloy curved surface member to be processed;
FIG. 11 is a schematic diagram of a second oblique incidence laser mode when a single-point double oblique incidence laser impacts an aluminum alloy curved surface member to be processed;
in the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein 1 is a member to be processed, 2 is a part to be processed, 3 is a single-layer absorbing layer, 4 is a multi-layer absorbing layer, and 5 is E1A pulsed laser beam with flat-top distribution of laser energy, 6 being E2A pulsed laser beam with flat-top distribution of laser energy, 7 being E2The laser energy flat-top distributed pulse laser beam 8 is an aluminum alloy curved surface component to be processed, 9 is a curved surface part to be processed, 10 is a laser energy flat-top distributed pulse laser beam, and 11 is a laser energy flat-top distributed pulse laser beamThe pulse laser beam 12 is a pulse laser beam with laser energy flat-top distribution.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof; for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention should be understood broadly, and for example, the terms "mounted", "connected", "fixed", and the like may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background art, the prior art has disadvantages, and in order to solve the above technical problems, the present invention provides a method for uniformly strengthening a curved surface based on single-point double oblique incidence laser shock.
In a typical embodiment of the present invention, as shown in fig. 1, a method for uniformly strengthening a curved surface based on single-point double oblique incidence laser shock is provided, which is particularly suitable for curved surface structures with deep-drawing shape characteristics, that is, a curved surface structure to be processed only has two-dimensional curved surface characteristics, and the longitudinal direction of the two-dimensional curved surface (parallel direction of continuous positions of the curved surface with the same curvature) no longer has curved surface characteristics. For example, the cylindrical structure and the spherical structure both have a circular cross section, but when viewed from a perpendicular angle to the circular cross section, the cylindrical shape no longer has a cambered surface feature, but the spherical structure still has a cambered surface feature, and the method of the present invention is more suitable for a curved surface region such as a cylindrical structure.
The principle of the method of the invention is as follows: when a flat-top energy distribution pulse laser beam is incident to a curved surface to be processed along a certain direction, different positions of the curved surface to be processed are inconsistent with the angle of the incident beam, which can cause the uneven distribution of the surface strengthening effect of the pulse laser on the curved surface; the method adopts two times of laser shock processing for coordinating incident angles, so that pulse lasers processed by the two times of lasers are respectively kept vertical to the two ends of the curved surface to be processed, the sum of the action intensities of the two times of laser shock processing received by any position of the curved surface to be processed is the same, and further single-beam uniform laser shock strengthening processing of the curved surface to be processed is realized.
When the square light spot pulse laser beam is used for carrying out laser shock treatment on the curved surface structure with the two-dimensional curved surface characteristic, two sides (two sides corresponding to the edge of the surface to be processed in four sides in the transmission path direction) of the square light beam are parallel to the normal direction of the surface of the two-dimensional curved surface characteristic (the edge position of the surface to be processed).
It should be noted that, the invention only realizes the strengthening treatment of the curved surface area to be processed within the single beam irradiation range for each laser impact on the small-area surface to be processed of the workpiece to be processed.
It should also be pointed out that the direct effect of the method of the invention is to achieve the same laser shock wave pressure received by any position of the curved surface to be processed, and the final surface strengthening effect is distributed on the curved surface to be processedThe uniformity depends on the mathematical relationship between the pressure load to which the material to be processed is subjected during surface strengthening and the effect of the introduced strengthening. For example, the method of the present invention is suitable for the following two conditions: (1) when the plates of the material to be processed are respectively subjected to single N1(e.g., laser shock wave loading induced by E × sin90 ° laser energy at laser normal incidence) effect of loading and two times N2(for example, the sum of oblique incidence angles of two times of impacts is equal to the incidence angle of a single impact) under the action of a load of laser shock wave induced by E multiplied by sin45 DEG laser energy under the oblique incidence condition of laser, the distribution rules of residual stress fields introduced by the materials under the two processing conditions are basically consistent or the size of the residual stress is in fixed proportion to the depth and the like; (2) when the material to be processed is subjected to two times of different loads, the loads are respectively NAAnd NBTime and load are respectively NCAnd NDThe distribution rule of the obtained residual stress field is basically consistent, wherein N isAAnd NBSum of incident angles of the employed pulsed laser and NCAnd NDThe sum of the incident angles of the adopted pulse laser is 90 degrees.
It should also be noted that the physical basis of the method of the present invention is that the surface strengthening effect of the material to be processed under the two impact pressures is allowed to be linearly accumulated, that is, the surface integrity strengthening effect of the laser shock wave pressure borne by any position on the surface of the material to be processed and the residual stress introduced into the material are linearly related. Therefore, the present invention has the following requirements for the material to be processed and the curved surface shape characteristics of the material to be processed: (1) for high-strength metal materials such as stainless steel, high-temperature alloy and the like, the curved surface to be processed has the thickness of not more than 50m-1The overall radian of the curved surface to be processed is not more than 20 degrees; (2) for metal materials with lower strength such as aluminum alloy, titanium alloy and the like, the curved surface to be processed is not more than 100m-1The curvature of the curved surface to be processed is not more than 45 degrees; (3) the shape function of the curved surface to be processed of the material to be processed should keep the characteristic of 'no second derivative zero point'.
It should also be noted that the present invention is a method of makingLaser shock processing method for replacing one fixed angle single-point shock by two different angle single-point shocks, wherein pulse laser energy E adopted in two different angle processing2The pulse laser energy E adopted by one-time fixed-angle single impact which should be replaced by the original pulse laser energy E1The preferred interval of the process of the invention is E2＝(75％±5％)E1The energy selection can also be accurately obtained from the processing experience or mathematical calculations of the skilled person.
The method of the invention aims at, but is not limited to, square spot laser shock treatment of a drawing arc surface and pulse laser shock treatment with a flat-top laser energy distribution mode.
Specifically, the following describes the steps of the method for uniformly strengthening a curved surface based on single-point double oblique incidence laser shock.
Step 1: limiting a part to be processed, and protecting a non-processing area;
the method comprises the steps of limiting a single-point impact area of a curved surface to be machined of a component 1 to be machined, and after a single-beam part 2 to be machined is determined, protecting a non-machined area of the component to be machined.
The curved surface to be processed of the component 1 to be processed is a two-dimensional curved surface, and the part to be processed is selected from the curved surface to be processed.
In the operation, the laser single-beam irradiation area in the method of the invention needs to completely cover the part to be processed.
The protection treatment for the non-processing area includes, but is not limited to, coating a plurality of layers of absorbing layer materials on the edge area of the to-be-processed part, that is, forming a plurality of layers of absorbing layers 4 around the to-be-processed part, which are coated on the non-processing area, and using the attenuation effect of the plurality of layers of absorbing layers on the laser shock wave to prevent the non-processing area from being affected by the laser shock wave.
Further, coating a single-layer absorption layer 3 on the part to be processed 2; the absorption layer is used for forming plasma, and further inducing the subsequent plasma shock wave to generate impact force on the material. The single-layer absorbing layer and the multi-layer absorbing layer are made of the same materials. The single layer can form enough plasma, and the premise is that under the condition of the laser parameter of the selected pulse laser energy, the absorption layer is not damaged after the impact is finished, so that the surface ablation effect of the damage on the surface of the material is avoided; the thickness of the absorption layer has influence on the laser shock wave pressure, and the absorption layer can transmit larger shock wave pressure to the surface of the material by selecting a thinner thickness under the condition that the absorption layer is not damaged; the purpose of the multi-layer absorption layer is to utilize the buffer effect of the thickness of the absorption layer on the shock wave pressure, so that the thicker absorption layer can completely absorb the undesired shock wave pressure, and the non-processing area can be sufficiently protected under the no-load effect.
In this step, the material of the absorbent layer is preferably black tape, and the number of coated layers of the absorbent layer in the non-processed region can be determined in advance through experiments.
It should be noted that the application of the absorbing layer in the non-processed areas is required to ensure that the subsequent laser shock effects do not result in significant surface integrity parameter changes in this area.
Step 2: making a single-point double laser impact scheme of a part to be processed of a component to be processed;
in the step, laser parameters such as pulse laser energy and the like adopted by single-point double oblique incidence laser impact and process parameters such as an incidence angle and the like of a member to be processed in the two laser impact processes are set.
As shown in FIG. 4, in the conventional laser shock treatment of a portion to be processed, E is generally used1The material is subjected to laser shock processing at the illustrated angle by a pulsed laser beam 5 with a flat-top distribution of laser energy. During the illustrated laser shock treatment, the flat-topped energy distributed pulsed laser is generally held at a perpendicular angle to the central position of the part to be machined. The method shown in fig. 4 is used to perform single laser shock treatment on the curved surface to be processed, and the distribution of the obtained residual stress field on the surface of the material is shown in fig. 5, wherein the residual stress field has different intensity distributions at different positions of the curved surface.
In the scheme of the invention, the workpiece is to be processedThe curved surface part is processed by single-point double oblique incidence laser shock, in the embodiment, the laser energy E of the pulse laser adopted in the double laser shock processing process2Laser energy E of pulse laser used for single fixed incidence angle laser shock treatment10.75 times of.
In the scheme of the invention, the curved surface part to be processed is subjected to single-point double oblique incidence laser shock treatment, and pulse laser respectively keeps vertical angles with two end positions of the curved surface part to be processed in the double laser shock treatment process.
The pulse laser beam is perpendicular to the two ends of the curved surface to be processed, and the incident angle of the pulse laser relative to the member to be processed can be obtained according to the inclination angles of the two ends of the curved surface to be processed under the condition that the pulse laser respectively keeps perpendicular angles with the two ends of the curved surface to be processed.
And step 3: coating a constraint layer of a curved surface part to be processed of a component to be processed, and clamping the component to be processed;
the method comprises the steps of pre-processing the single-point double oblique incidence laser shock treatment of the component to be processed, clamping the component to be processed on a mechanical arm of a laser shock system, and applying or coating a constraint layer material on the curved surface part to be processed.
Specifically, the material of the constraint layer is preferably deionized water. In the laser shock process, the absorption layer is made of a material for forming plasma, and the absorption layer is instantly gasified to form the plasma; the function of the restraint layer is to limit the plasma in a narrow space on the surface of the material, so that the compressed plasma forms shock waves, and the action direction of the shock waves is restrained to be transmitted to the surface of the material. The deionized water is only coated on the area to be processed, but in order to ensure the integrity of the processing of the edge of the part to be processed, the coverage area is slightly larger than the part to be processed; the application of water has no significant adverse effect on the material, so that the application area can completely cover the part to be processed, i.e. the impact area.
And 4, step 4: carrying out double laser shock treatment on a part to be processed of a component to be processed;
in the step, the laser shock treatment is carried out on the part to be processed according to the two-time shock incidence angles set in the single-point two-time oblique incidence laser shock treatment scheme determined in the step 2.
As shown in FIGS. 6 and 7, has E2The laser energy and the energy distribution mode are that the pulse laser beams distributed in a flat top mode keep two different incidence angles to carry out impact treatment on the curved surface to be processed.
The specific operation process is as follows: the method comprises the steps of firstly irradiating a pulse laser beam to a part to be processed of a component to be processed at a first incident angle, and then irradiating the pulse laser beam to the part to be processed of the component to be processed at a second incident angle, so that single-point double-oblique-incidence laser impact treatment of the component to be processed is realized.
Wherein, when the pulse laser beam is at the first incident angle, the pulse laser beam keeps vertical incidence relation with one end of the part to be processed of the component to be processed, as shown in FIG. 6, E2The pulse laser beam 6 with the laser energy distributed on the flat top is vertical to the left side of the part to be processed; when the pulse laser beam is at the second incident angle, the pulse laser beam is in a vertical incident relation with the other end of the portion to be processed of the member to be processed, as shown in FIG. 7, E2The pulse laser beam 7 with the laser energy distributed in a flat top is vertical to the right side of the part to be processed. Of course, the laser beam perpendicular to the right side of the portion to be processed may be used for the impact treatment, and then the laser beam perpendicular to the left side of the portion to be processed may be used for the impact treatment.
After two times of laser beam impact processing with different incident angles, the different positions of the curved surface to be processed of the component to be processed obtain relatively consistent residual compressive stress field distribution and relatively uniform laser impact strengthening effect, as shown in fig. 8. The broken lines at three locations on the surface of the material in fig. 5 and 8 represent the step states of the compressive residual stress introduced into the material. In FIG. 5, the intermediate position is where laser energy E1 is fully applied due to the normal incidence of the laser, resulting in a distinct residual compressive stress step; the edge position corresponds to oblique incidence of the laser energy E1, and the intensity of the actually obtained laser energy is small, for example, to E1 × sin60 °, resulting in a lower level of the intensity of the induced residual compressive stress at the edge position than at the normal incidence position. In fig. 8, the three positions are all two times of impact, and the sum of the incident angles of the two times of laser at the three positions is 90 ° at the two times of impact, according to the optimal condition 2 applicable to the present invention, the distribution states of the residual compressive stress introduced at the three positions should be substantially consistent.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
Take uniform laser shock peening a 7050 aluminum alloy curved surface member as an example.
Under the condition of the prior art, flat-top energy distribution pulse laser is generally adopted to carry out laser shock treatment with fixed energy, so that uneven distribution of surface integrity parameters such as residual stress at different positions of a curved surface to be processed and the like is easily caused. As shown in fig. 9, the curved surface portion 9 to be processed of the curved member 8 to be processed is subjected to laser shock treatment, the linear distance between the two ends of the curved surface is limited to be within 3mm by the curved surface, and when the laser shock treatment is performed at a single-point fixed incident angle: adopting a pulse laser beam 10 with laser energy distributed in a flat-top manner, wherein the laser energy of the laser beam is 5J, the pulse width is 18ns, and the diameter of a light spot is 3 mm; the fixed incident angles used were: the laser beam keeps a vertical relation with a specific position inside the curved surface to be processed. By doing so, the residual stress field has different intensity distributions at different locations of the curved surface.
By adopting the scheme of the invention, when the surface strengthening treatment is carried out on the aluminum alloy curved surface component to be processed by single-point double oblique incidence laser impact uniformity;
(1) firstly, coating a plurality of black adhesive tape absorption layers on the edge of a determined curved surface part to be processed, wherein the absorption layer of the curved surface part to be processed is a single layer, and the absorption layer of a non-processing area adjacent to the curved surface part to be processed is a plurality of layers;
(2) determining the parameters of the pulse laser adopted by the double laser shock treatment as follows: the laser energy is 4J, the pulse width is 18ns, and the diameter of a light spot is 3 mm; determining that the pulse laser beams adopted by the double laser shock treatment respectively keep vertical relation with the positions of two ends of the curved surface part to be processed, as shown in FIG. 10, when the laser shock treatment is carried out for the first time, the pulse laser beam 11 with the laser energy distributed in a flat top manner is vertical to the right end of the curved surface of the aluminum alloy to be processed, as shown in FIG. 11, and when the laser shock treatment is carried out for the second time, the pulse laser beam 12 with the laser energy distributed in a flat top manner is vertical to the left end of the curved surface of the aluminum alloy to be processed;
(3) clamping a curved surface component to be processed on a mechanical arm of a laser impact system, and spraying a flowing deionized water curtain on the curved surface part to be processed;
(4) and respectively carrying out double single-point laser shock treatment on the two ends of the curved surface part to be processed by adopting pulse laser with the laser energy of 4J, wherein the pulse laser is vertical to the two ends of the curved surface part to be processed.
And after the laser shock treatment is finished, removing the deionized water on the surface of the member to be processed, and stripping the black adhesive tape absorption layer on the surface of the material to obtain the curved surface member with uniformly distributed surface integrity parameters.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A curved surface uniform strengthening method based on single-point double oblique incidence laser impact is characterized by comprising the following steps:
when the laser shock processing is carried out on the member to be processed with the two-dimensional curved surface, firstly, the pulse laser beam is irradiated to the member to be processed at a first incident angle, then, the pulse laser beam is irradiated to the member to be processed at a second incident angle, and the two pulse laser beams are respectively kept perpendicular to the two end positions of the member to be processed, so that the sum of the action intensities of the two laser shock processing received by any position of the member to be processed is the same;
before laser shock treatment, selecting a part to be processed on a two-dimensional curved surface of a component to be processed, and protecting a non-processing area of the two-dimensional curved surface; when the pulse laser beam is at a first incidence angle, the pulse laser beam keeps a vertical incidence relation with one end of a part to be processed of the component to be processed; when the pulse laser beam is at the second incidence angle, the pulse laser beam keeps a vertical incidence relation with the other end of the part to be processed of the component to be processed;
if the material of the member to be processed is stainless steel or high-temperature alloy, the two-dimensional curved surface has a thickness of not more than 50m-1The radian of the two-dimensional curved surface is not more than 20 degrees; if the material of the member to be processed is aluminum alloy or titanium alloy, the two-dimensional curved surface has a length of not more than 100m-1The radian of the two-dimensional curved surface is not more than 45 degrees; and the shape function of the two-dimensional curved surface of the component to be processed has no second derivative zero point.
2. The method of uniformly strengthening a curved surface according to claim 1, wherein the protective treatment comprises: the edge region of the region to be processed is coated with a plurality of layers of absorbent layer material.
3. The method for uniformly strengthening a curved surface according to claim 1, wherein before the laser shock treatment, a single absorption layer is coated on the part to be processed, then the member to be processed is clamped, and a constraint layer material is coated on the surface of the member to be processed.
4. The method of claim 3, wherein the constraint layer is made of deionized water.
5. The method for uniformly reinforcing a curved surface according to claim 1, wherein when the member to be processed is subjected to the laser shock treatment using the pulse laser beam with the square spot, both sides of the transmission path of the square spot in the direction corresponding to the edge of the surface to be processed are parallel to the normal direction of the position of the edge of the surface of the member to be processed.
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| CN103343188B (en) * | 2013-07-19 | 2015-06-24 | 江苏大学 | Laser shock peening absorbing layer and clamping device thereof |
| CN105039652B (en) * | 2015-04-29 | 2017-09-05 | 江苏大学 | A kind of uniform intensifying method of square focus spot laser-impact for curved surface |
| CN109207713A (en) * | 2018-03-21 | 2019-01-15 | 中国航空制造技术研究院 | A kind of laser shock peening method of part corner regions |
| CN109207707A (en) * | 2018-03-21 | 2019-01-15 | 中国航空制造技术研究院 | The laser shock peening method of face of weld |
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2020
- 2020-11-27 CN CN202011364192.6A patent/CN112609066B/en active Active
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