Local selection processing method and processing device for cylinder inner hole

Abstract

The present invention discloses a local area selection processing method for the inner hole of a cylinder and a local area selection processing device. The local area selection processing method for the inner hole of a cylinder comprises the following steps: obtaining the position of a target area, the target area being a local area of ​​the inner hole of the cylinder, and obtaining the position of an area to be processed according to the position of the target area, the area to be processed covers the target area and the area of ​​the area to be processed is larger than the area of ​​the target area; performing laser ablation pretreatment on the area to be processed; performing high-speed laser cladding processing on the entire area in the circumferential direction where the area to be processed is located to form a high-speed laser cladding processing layer; and directly performing honing processing on the high-speed laser cladding processing layer. The processing method of the embodiment of the present invention performs high-speed laser cladding processing on the entire area in the circumferential direction where the area to be processed is located, and can directly perform honing processing on the cladding surface of the local area without the need for other processing steps, thereby improving the processing accuracy of post-processing.

Description

Technical Field

[0001] The invention relates to a local selected area processing method and a processing device for a cylinder inner hole. Background Art

[0002] Hydraulic cylinders are important actuators in engineering machinery. During actual service, the inner surface of the cylinder bore is in constant contact with the working medium. Some hydraulic cylinders use emulsions or oil-gas mixtures as their working medium. Because emulsions and air contain moisture, this can easily cause rust in localized areas of the cylinder bore where these areas come into contact. Therefore, improving the service performance of these localized areas during cylinder manufacturing is crucial for improving overall cylinder reliability.

[0003] On the other hand, defects such as scratches and black scale are prone to appearing during the machining of the cylinder bore. In severe cases, these defects can exceed dimensional and tolerance requirements, leading to the scrapping of the workpiece. Furthermore, during the reciprocating operation of the hydraulic cylinder, due to the ingress of hard particles into the guide sleeve seal or contamination of the hydraulic system, deep groove-like scratches can appear on the cylinder bore surface after long periods of operation. Therefore, remanufacturing and repairing localized defects on the inner bore surface is crucial for reducing cylinder manufacturing costs and increasing the recycling rate of waste parts.

[0004] It should be noted that the statements in this background technology section only provide background technology related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The present invention provides a local area selection processing method and a processing device for a cylinder bore, so as to improve the processing accuracy of the local area selection processing of the cylinder bore.

[0006] A first aspect of the present invention provides a method for processing a local selected area of ​​a cylinder bore, comprising the following steps:

[0007] Obtaining the position of the target area, which is a local area of ​​the inner hole of the cylinder, and obtaining the position of the area to be treated based on the position of the target area, wherein the area to be treated covers the target area and the area of ​​the area to be treated is larger than the area of ​​the target area;

[0008] Perform laser ablation pretreatment on the area to be treated;

[0009] Performing high-speed laser cladding treatment on the entire area in the circumferential direction of the area to be treated to form a high-speed laser cladding treatment layer;

[0010] The high-speed laser cladding treatment layer is directly honed.

[0011] In some embodiments, the target area includes a defective area, and the position of the defective area is obtained by detecting the surface of the inner hole of the cylinder.

[0012] In some embodiments, obtaining the position of the target area by surface detection of the inner hole of the cylinder includes: using a laser triangulation probe to obtain the height coordinates of multiple points on the surface of the inner hole of the cylinder; and obtaining the position of the defective area based on the height coordinates of the multiple points, a set threshold, the number of rotations of the cylinder, and the position of the laser triangulation probe.

[0013] In some embodiments, the processing method further includes: issuing an alarm when the height coordinates of at least some of the multiple points exceed a set threshold.

[0014] In some embodiments, after performing laser ablation pre-treatment on the area to be processed covering the target area and before performing high-speed laser cladding treatment on the entire area in the circumferential direction where the area to be processed is located, the processing method further includes: performing local high-speed laser cladding treatment on the defective area to fill the defective area.

[0015] In some embodiments, performing a local high-speed laser cladding process on the defective area to fill the defective area includes: determining a cladding thickness of the local high-speed laser cladding process according to a maximum depth of the defective area.

[0016] In some embodiments, the target area includes a specific area, which includes a local area of ​​the cylinder bore close to the guide sleeve; or, the specific area includes a local area of ​​the cylinder bore in contact with the corrosive working medium.

[0017] In some embodiments, performing laser ablation pre-treatment on the area to be processed covering the target area includes: performing laser ablation pre-treatment on the area to be processed by using a high-speed laser cladding nozzle in a positive defocus mode.

[0018] A second aspect of the present invention provides a device for processing a local area of ​​a cylinder bore, comprising:

[0019] a turntable for carrying the cylinder and configured to rotate the cylinder about its axis;

[0020] a cantilever beam configured to be movably disposed along an axis of the cylinder;

[0021] A working head is provided at the end of the cantilever beam. The working head is used for a high-speed laser cladding nozzle for processing the area to be processed of the inner hole of the cylinder. The high-speed laser cladding nozzle is detachably connected to the cantilever beam. The high-speed laser cladding nozzle is used for performing laser ablation pretreatment on the area to be processed and performing high-speed laser cladding treatment on the entire area in the circumferential direction where the area to be processed is located.

[0022] The controller is connected to the cantilever beam, the turntable and the working head by signal, and is configured to execute the above processing method.

[0023] In some embodiments, the local selection processing device further includes a laser triangulation distance measuring probe, and the laser triangulation distance measuring probe and the high-speed laser cladding nozzle are selectively connected to the cantilever beam.

[0024] Based on the technical solution provided by this application, a method for processing a local area of ​​a cylinder bore includes the following steps: obtaining the position of a target area, which is a local area of ​​the cylinder bore, and obtaining the position of a to-be-processed area based on the position of the target area, wherein the to-be-processed area covers the target area and has an area larger than that of the target area; performing laser ablation pretreatment on the to-be-processed area; performing high-speed laser cladding treatment on the entire area in the circumferential direction of the to-be-processed area to form a high-speed laser cladding treatment layer; and directly honing the high-speed laser cladding treatment layer. The processing method of the embodiment of the present invention performs high-speed laser cladding treatment on the entire area in the circumferential direction of the to-be-processed area, and can directly perform honing on the cladding surface of the local area without the need for other processing steps, thereby improving the processing accuracy of post-processing.

[0025] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 Schematic diagram of the structure of the cylinder inner hole processing device according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of a processing device according to an embodiment of the present invention detecting a defective area.

[0029] Figure 3 for Figure 2 Schematic diagram of the structure of the laser triangulation ranging probe.

[0030] Figure 4 Surface profile curves of the inner hole of the cylinder barrel according to some embodiments of the present invention.

[0031] Figure 5 and Figure 6 Schematic diagram of a processing device according to an embodiment of the present invention performing local high-speed laser cladding on a defective area.

[0032] Figure 7 This is a schematic diagram of a cylinder after being processed by a processing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used herein are interpreted accordingly.

[0036] Currently, when treating localized areas of the cylinder bore surface using processes like surfacing welding and laser cladding, their application is limited by the inability to perform post-processing on the localized coating. Using a comprehensive surface treatment process, however, presents challenges of high cost and low efficiency. Furthermore, coatings produced using processes like surfacing welding and laser cladding have poor surface forming accuracy, large heat-affected zones, and are prone to deformation, resulting in high post-processing costs. Furthermore, current technologies are unable to detect the position and size of the inner bore surface, preventing accurate and efficient treatment of the cylinder bore surface.

[0037] Lasers have the advantages of high directivity, high brightness, and good monochromaticity, and are widely used in mechanical processing, data acquisition and other fields. Laser scanning technology has fast detection speed, high accuracy and can achieve non-contact measurement, thus providing a solution for the acquisition of inner hole morphology and precise positioning of defects. As a new surface strengthening technology, high-speed laser cladding changes the laser energy distribution, with 80% of the energy acting on the powder and 20% on the substrate, thereby achieving the preparation of various high-performance coatings such as wear-resistant and corrosion-resistant coatings on the substrate surface. Its deformation, processing efficiency, and production cost are significantly higher than those of ordinary cladding, and the coating can be directly honed. Based on the above ideas, this application proposes a local selection processing device and processing method for the inner hole of the cylinder.

[0038] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a device for processing the inner hole of a cylinder. The device for processing the inner hole of a cylinder includes a turntable 110, a cantilever beam 130, a working head and a controller 200. The turntable 110 is used to support the cylinder 50, and the cylinder 50 is configured to be rotatable around its own axis relative to the turntable 110. The cantilever beam 130 is configured to be movably arranged along the axis of the cylinder 50. The working head is arranged at the end of the cantilever beam 130. The working head includes a high-speed laser cladding nozzle 140, which is detachably connected to the cantilever beam 130. The controller 200 is signal-connected to the cantilever beam 130 and the high-speed laser cladding nozzle 140. The controller is configured to execute a local selection processing method.

[0039] The method for processing a local area of ​​a cylinder bore provided by an embodiment of the present invention includes the following steps:

[0040] Obtaining the position of the target area, which is a local area of ​​the inner hole of the cylinder, and obtaining the position of the area to be treated based on the position of the target area, wherein the area to be treated covers the target area and the area of ​​the area to be treated is larger than the area of ​​the target area;

[0041] Controlling the high-speed laser cladding nozzle 140 to perform laser ablation pretreatment on the area to be processed;

[0042] The high-speed laser cladding nozzle 140 is controlled to perform high-speed laser cladding processing on the entire area in the circumferential direction where the area to be processed is located to form a high-speed laser cladding processing layer.

[0043] The high-speed laser cladding treatment layer is directly honed.

[0044] The processing device for the inner bore of the cylinder according to the embodiment of the present invention performs a laser ablation pre-treatment on the area to be processed before performing a high-speed laser cladding treatment on the entire area in the circumferential direction where the area to be processed is located. This can avoid the adverse effects of defects, residual hydraulic oil, etc. in the area to be processed on the quality of the high-speed laser cladding layer, thereby improving the quality of the cylinder. Moreover, when repairing, the processing device for the inner bore of the cylinder according to the embodiment of the present invention performs a high-speed laser cladding treatment on the entire area in the circumferential direction where the area to be processed is located, rather than performing a cladding treatment on a local area of ​​the inner bore of the cylinder. This is beneficial to reducing the problem of uneven heating and deformation caused by cladding, improving the heating uniformity of the cylinder during the processing of the local area of ​​the inner bore, and reducing the processing deformation of the parts. Moreover, performing a high-speed laser cladding treatment on the entire area in the circumferential direction where the area to be processed is located can directly perform a honing process on the cladding surface of the local area without the need for other processing steps, thereby improving the processing accuracy of post-processing.

[0045] It should be noted that in the above description, the entire circumferential area of ​​the area to be treated refers to the annular area within the same axial position as the area to be treated. This entire area is also a local area of ​​the cylinder bore, not the entire area of ​​the cylinder bore.

[0046] The processing method of the embodiment of the present invention first obtains the position of the target area. After obtaining the position of the target area, the target area is expanded to obtain the area to be processed, thereby improving the smoothness between the target area and the remaining areas.

[0047] The cylinder bore processing device and the corresponding processing method of the embodiment of the present invention can be used to process defective cylinder bores, and can also be used to process cylinders without defects but requiring local reinforcement of the inner bore surface.

[0048] The following will describe the two different applicable situations respectively.

[0049] In some embodiments, when there is a defect in the inner hole of the cylinder, the area to be processed includes the defective area. The position of the defective area is obtained by surface inspection of the inner hole of the cylinder.

[0050] Since the internal space of the hydraulic cylinder bore is relatively narrow, it is impossible to directly observe the surface condition of the inner bore and the location of defects with the naked eye. The traditional CCD imaging method is limited by the low brightness of the cylinder bore space and the surface reflection, and cannot accurately detect the surface condition of the inner bore, especially some small-scale defects cannot be detected, resulting in a lack of pertinence in subsequent surface treatment and defect repair. The embodiment of the present invention proposes a method for detecting the surface condition of the inner bore based on the principle of laser triangulation, which detects the changes in the contour of the inner bore surface and then determines whether there are defects. Surface detection of the cylinder bore to obtain the location of the defective area includes: using the laser triangulation method to detect the height coordinates of multiple points on the surface of the cylinder bore to obtain the location of the defective area.

[0051] Surface inspection of the inner hole of the cylinder to obtain the position of the defective area includes: using a laser triangulation probe to obtain the height coordinates of multiple points on the surface of the inner hole of the cylinder; and obtaining the position of the defective area based on the height coordinates of the multiple points, a set threshold, the number of rotations of the cylinder, and the position of the laser triangulation probe.

[0052] like Figure 2 and Figure 3 As shown, in a specific embodiment, a laser triangulation probe 120 is used to detect the inner hole surface of the cylinder. The laser triangulation probe 120 is fixed on the cantilever beam 130. During the test, the line laser emitted by the laser triangulation probe 120 is parallel to the axial direction of the measured part. During the detection process, the cylinder 50 rotates at a certain angular velocity ω1, and the laser triangulation probe 120 moves at a constant speed V1 along the axial direction of the cylinder 50 under the action of the manipulator, so that the height coordinate value Z of each point on the inner hole surface can be detected in real time. The controller 200 captures the height coordinate value data collected by the laser triangulation probe 120 at fixed time intervals, and draws the inner hole surface morphology profile 50a based on the captured data, and judges whether there are defects by comparing the height coordinate value Z of each point. When there are no defects on the inner hole surface, the height coordinate value Z of each point collected on the inner hole surface should fluctuate within a very small range. When there are defects on the surface, the height coordinate value Z of the position will fluctuate significantly. As shown Figure 4 As shown, the height coordinate value Zn of the defect position on the inner hole surface is significantly reduced. The defect alarm and storage module can set a fluctuation threshold of the height coordinate value Z. When the height coordinate value Z exceeds the fluctuation threshold, the system will alarm and record the number of rotations of the cylinder 50 and the position coordinates of the cantilever beam 130 at this time, thereby determining the location of the defect. At the same time, the difference between the height coordinate value Z' obtained by actual detection and the height coordinate value Z under normal circumstances is the depth value of the defect position. After the detection is completed, the maximum depth value Z of the defect can be obtained by comparison. max and the length of the defect.

[0053] The processing device of this embodiment can detect the surface condition of the inner hole of the cylinder through the laser triangulation ranging probe 120 and can accurately determine the location of the defect when a defect occurs.

[0054] The processing method further includes: issuing an alarm when the height coordinates of at least some of the multiple points exceed a set threshold.

[0055] In some embodiments, as Figure 1 As shown, the processing device of the embodiment of the present invention further includes an alarm device 400. The alarm device 400 is signal-connected to the controller 200 to output an alarm signal based on the height coordinate value data captured by the controller. For example, when the height coordinate value captured by the controller 200 exceeds a threshold, the alarm device 400 will emit an alarm sound or an alarm light.

[0056] During the production and processing of hydraulic cylinders, contaminants such as burrs and oil stains remain on the inner surface. During reciprocating operation, the inner surface rusts due to contact with corrosive media. Strain on the inner surface of the cylinder causes residual hydraulic fluid and other working media to form in the narrow grooves. These problems can affect the quality of the high-speed laser cladding repair layer, weakening the performance of the interface and increasing the impurity content within the coating.

[0057] In order to improve the above problems, an embodiment of the present invention proposes a laser ablation pretreatment method in a positive defocus mode, which is to enable a high-speed laser cladding nozzle to perform laser ablation pretreatment on the area to be treated in a positive defocus mode, which is beneficial to increase the diameter of the laser spot acting on the surface of the inner hole of the cylinder, thereby improving the processing efficiency of the surface ablation pretreatment.

[0058] like Figure 5 and Figure 6 As shown, the high-speed laser cladding nozzle 140 is fixedly mounted on the cantilever beam, and the cantilever beam 130 drives the high-speed laser cladding nozzle 140 to move in translation along the axis. Based on the position of the defect area obtained by the above-mentioned controller, the robot drives the cantilever beam 130 to drive the high-speed laser cladding nozzle 140 to the front end of the defect area and offset it outward by a distance of 40-80 mm. At the same time, the laser ablation treatment area should exceed the rear end of the defect area by 40-80 mm, so that the laser can perform full-coverage ablation treatment on the area to be treated that covers the defect area. Further, the distance between the high-speed laser cladding nozzle 140 and the inner hole surface is adjusted so that the laser beam reaches the inner hole surface in a positive defocus mode, the laser spot diameter at the inner hole surface of the cylinder is d2, and when the overlap rate of two adjacent ablation layers is λ, the relationship between the cantilever beam moving speed V2 and the rotation angular velocity ω2 is:

[0059] V2=(1-λ)*d2*ω2 / 2π

[0060] After pre-processing the defective area with laser ablation and before performing high-speed laser cladding on the entire area in the circumferential direction where the defective area is located, in some embodiments, the processing method further includes: performing local high-speed laser cladding on the defective area to fill the defective area.

[0061] In some embodiments, performing a local high-speed laser cladding process on the defective area to fill the defective area includes: determining a thickness of the local high-speed laser cladding process according to a maximum depth of the defective area.

[0062] After the laser ablation pre-treatment is completed, the high-speed laser cladding technology is used to process the locations that need surface treatment. High-speed laser cladding processing and laser ablation processing use the same high-speed laser cladding nozzle 140. First, according to the technical requirements of the inner hole surface treatment, the appropriate cladding material is selected. Secondly, when processing the inner hole surface with defects, based on the defect location detected, a two-step high-speed laser cladding material process is used. In the first step, the thickness of the high-speed laser cladding layer is compared with the maximum defect depth Z. max The width of the cladding layer along the axis of the cylinder is consistent with the width of the defect. After setting matching process parameters, the cladding process is carried out. In the second step, a second layer of high-speed laser cladding is prepared on the surface of the first cladding layer. The thickness of the cladding layer is about 0.2-0.3mm, and the width of the cladding layer along the axis of the part is consistent with the laser ablation area.

[0063] High-speed laser cladding coatings have the advantages of high thickness uniformity and strong controllability of machining allowances. Therefore, in this embodiment, honing is directly used to post-process the high-speed cladding coating on the inner hole surface. Since the honing stone has the yielding property during the honing process, it can effectively offset the clamping error of the inner hole parts. At the same time, the honing stone has the self-adjusting ability, which can ensure the uniformity of the coating removal amount in the circumferential direction. The width of the honing head should be more than 50mm smaller than the width of the cladding layer along the axis of the part, the rotation speed is 100-200r / min, the reciprocating motion speed is 15-20m / min, and the reciprocating motion stroke range is 40-80mm larger than the total width of the cladding layer. When the coating is honed to be basically consistent with the size of the substrate on both sides, the reciprocating motion stroke range of the honing head is adjusted to perform an overall honing process on the inner hole surface, thereby ensuring the consistency of the inner hole surface processing quality.

[0064] In some of these embodiments, the treatment methods of the present invention are used to locally strengthen the surface of the cylinder bore, rather than repair it. The specific area to be strengthened is pre-determined based on the target location. For example, in some embodiments, the specific area includes a portion of the cylinder bore near the guide sleeve. In other embodiments, the specific area includes the area of ​​the cylinder wall in contact with the gaseous working medium in a hybrid oil-gas hydraulic cylinder.

[0065] The following details the treatment of the inner wall of a cylinder, using a specific embodiment. The cylinder's parameters are: outer diameter 440mm, inner diameter 380mm, and length 1200mm. A groove-like scratch exists on the inner surface of the cylinder bore. This defect is efficiently repaired using high-speed laser cladding technology. One end of the cylinder is secured by a three-jaw chuck, while the other end rests on a roller. These two elements work together to rotate the cylinder around its axis, ensuring coaxial straightness during operation.

[0066] First, the laser triangulation ranging probe 120 is used to scan and reconstruct the inner hole defects to determine the specific defect size and position. The laser triangulation ranging probe 120 is fixed at the front end of the cantilever beam, and the scanning probe is driven to the front position of the cylinder inner hole by the cantilever beam. The distance between the probe and the cylinder inner hole is adjusted. The specific parameters are: the scanning laser uses a wide spot, the spot length is 30mm, the distance between the probe and the inner hole is 40mm, and the scanning linear speed is 10m / min. In order to ensure that the entire inner hole surface is scanned and all defect positions are determined, while ensuring the scanning efficiency, the overlap rate is set to 10%, and the angular velocity of the cylinder workpiece rotation and the linear velocity of the probe forward movement need to maintain a certain linear relationship. The fluctuation threshold of the height value of the inner hole surface of the cylinder is set to 0.1mm. When the fluctuation range of the height value of the inner hole surface is detected to exceed the threshold, the defect position at this time is recorded. Finally, through comparative analysis, it was found that there was a defect of 260mm long, 1mm wide, and 0.5mm deep at a distance of 210mm from the positioning end face. As Figure 7 As shown, the axial length of the defect area is L1.

[0067] The high-speed laser cladding nozzle 140 was fixed to the front end of the cantilever beam. Based on the previously determined defect location, the cladding head was moved to the front end of the defect, 150 mm from the positioning end face. The laser power during the ablation process was 5000 W, the laser nozzle was positively defocused from the cylinder bore surface, the spot diameter was 5 mm, and the scanning linear speed was 10 m / min. After the parameters were set, the cladding head moved forward approximately 370 mm. This means that the axial length L2 of the area to be treated is greater than the axial length L1 of the defect area.

[0068] After the pretreatment is completed, adjust the distance between the high-speed laser cladding head and the inner hole surface. The specific cladding parameters are as follows: the first step, the laser power is 4300W, the spot diameter is 2mm, the scanning speed is 15m / min, the powder feeding amount is 50g / min, the shielding gas pressure is 10L / min, and the overlap rate is 75%. The cladding head movement range is 210mm to 470mm from the positioning end face. The second step, the laser power is 3500W, the spot diameter is 2mm, the scanning speed is 20m / min, the powder feeding amount is 33g / min, the shielding gas pressure is 10L / min, the overlap rate is 75%, and the cladding head movement range is 150mm to 520mm from the positioning end face. After the final high-speed laser cladding treatment, Figure 6 shown.

[0069] Honing is directly used to post-process the inner hole wall. In terms of honing parameter settings, the width of the honing head is 200mm, the reciprocating stroke of the honing head is 420mm, and the processing is carried out according to the process parameters of the coarse honing and fine honing of the cladding layer. When the size of the cladding layer is equivalent to the uncladding area on both sides, the stroke of the honing head is adjusted to the full length of the inner hole of the part 1200mm for overall honing, thereby ensuring the integrity of the overall processing of the inner hole surface. The local selection processing method of the embodiment of the present invention can directly adopt the honing post-processing process, reduce the processing steps, improve the processing efficiency, and solve the problem that the existing local area surface treatment coating cannot be post-processed.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A method for processing a local area of ​​a cylinder bore, characterized in that: The steps include: Obtaining a position of a target area, the target area being a local area of ​​the inner hole of the cylinder, and obtaining a position of a to-be-treated area based on the position of the target area, wherein the to-be-treated area covers the target area and has an area larger than that of the target area; The high-speed laser cladding nozzle is used to perform laser ablation pretreatment on the area to be processed in a positive defocus mode. The laser spot diameter of the high-speed laser cladding nozzle on the surface of the inner hole of the cylinder is d2. When the overlap rate of two adjacent ablation layers is λ, the relationship between the cantilever beam moving speed V2 and the rotation angular velocity ω2 is: V2=(1-λ)*d2*ω2 / 2π, wherein the high-speed laser cladding nozzle is provided at the end of the cantilever beam and the cantilever beam is configured to be movably provided along the axis of the cylinder, the cylinder is configured to be rotatable around its axis, and the rotational angular velocity ω2 is the rotational speed of the cylinder; Performing high-speed laser cladding treatment on the entire area in the circumferential direction where the area to be processed is located to form a high-speed laser cladding treatment layer, wherein the entire area in the circumferential direction where the area to be processed is located refers to an annular area in the same axial position range as the area to be processed; directly performing a honing process on the high-speed laser cladding treatment layer; After laser ablation pre-treatment is performed on the area to be processed covering the target area and before high-speed laser cladding treatment is performed on the annular area, the processing method further includes: performing local high-speed laser cladding treatment on the defective area within the annular area to fill the defective area, and the local high-speed laser cladding treatment on the defective area to fill the defective area includes: determining the cladding thickness of the local high-speed laser cladding treatment according to the maximum depth of the defective area.

2. The method for local area selection processing of the cylinder inner hole according to claim 1, characterized in that: The target area includes a defective area, and the position of the defective area is obtained by detecting the surface of the inner hole of the cylinder.

3. The method for local area selection processing of the cylinder inner hole according to claim 2, characterized in that: The method of obtaining the position of the target area by detecting the surface of the inner hole of the cylinder includes: using a laser triangulation probe to obtain the height coordinates of multiple points on the surface of the inner hole of the cylinder; and obtaining the position of the defect area based on the height coordinates of the multiple points, a set threshold, the number of rotations of the cylinder, and the position of the laser triangulation probe.

4. The method for local area selection processing of the cylinder inner hole according to claim 3, characterized in that: The processing method further includes: issuing an alarm when the height coordinates of at least some of the multiple points exceed the set threshold.

5. The method for local area selection processing of the cylinder inner hole according to claim 1, characterized in that: The target area includes a specific area, and the specific area includes a local area of ​​the cylinder inner hole close to the guide sleeve; or the specific area includes a local area of ​​the cylinder inner hole in contact with the corrosive working medium.

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