Special-shaped inner groove machining method

Abstract

The invention discloses a special-shaped inner groove machining method. The special-shaped inner groove machining method comprises the following steps that initial technological parameters of a to-be-machined inner groove of a target cylindrical workpiece are obtained; according to the initial technological parameters, a corresponding machining tool is selected so that a circle of annular groove can be turned in the inner wall of the target cylindrical workpiece; switching a machining tool to roughly machine a circle of first inner groove; performing quality inspection on the first inner groove to obtain a first correction parameter; initial process parameters are adjusted, and a machining tool is switched to conduct finish machining on the first inner groove; switching a machining tool to roughly machine a circle of second inner groove; quality inspection is conducted on the second inner groove to judge whether the second inner groove meets the qualification requirement or not, if yes, finish machining is conducted on the second inner groove by switching the machining tool according to the initial technological parameters, and if not, second correction parameters are obtained; and initial process parameters are adjusted, the machining tool is switched to carry out finish machining on the second inner groove, and the machining method has the advantage that the machining precision of the inner grooves is improved.

Description

Technical Field

[0001] The present application relates to the technical field of turning processing, and in particular to a method for processing a special-shaped inner groove. Background Art

[0002] When a ring-shaped inner groove needs to be machined on the inner wall of some cylindrical workpieces, it is generally produced by turning with a combination of multiple tools. During the machining process, various machining error factors may cause the machined inner groove to be difficult to meet the quality requirements. The inner groove structure is generally more complex, especially some inner grooves with special-shaped structures, which are difficult to machine and more likely to cause machining errors. The machining accuracy is low and it is difficult to ensure the machining quality. Summary of the invention

[0003] The main purpose of the present application is to provide a method for machining special-shaped internal grooves, aiming to solve the technical problem of low machining accuracy of existing methods for machining internal grooves of cylindrical workpieces.

[0004] To achieve the above object, the present application provides a method for processing a special-shaped inner groove, comprising the following steps: Acquire initial process parameters of the inner groove to be processed of the target cylindrical workpiece; wherein the inner groove to be processed comprises an annular groove formed along the inner wall of the target cylindrical workpiece, and a first inner groove and a second inner groove are formed extending on both sides of the annular groove; According to the initial process parameters, a corresponding machining tool is selected to turn a circle of annular grooves on the inner wall of the target cylindrical workpiece; Switch the machining tool, and continue turning along one side of the annular groove on the inner wall of the target cylindrical workpiece to roughly machine a circle of the first inner groove; wherein one end of the first inner groove away from the annular groove is a plane; Performing a quality inspection on the first inner groove to obtain a first correction parameter; adjusting the initial process parameters according to the first correction parameters, and switching the machining tool to perform finish machining on the first inner groove; Switch the machining tool, and continue turning along the other side of the annular groove on the inner wall of the target cylindrical workpiece to roughly machine a circle of the second inner groove; wherein the second inner groove has a first fillet and a second fillet at one end away from the annular groove, and a first inclined surface is connected between the first fillet and the second fillet; Performing a quality inspection on the second inner groove to determine whether the second inner groove meets the qualification requirements; If yes, switching the machining tool according to the initial process parameters to perform finish machining on the second inner groove; If not, the second correction parameter is obtained, the initial process parameter is adjusted according to the second correction parameter, and the machining tool is switched to perform finish machining on the second inner groove.

[0005] Optionally, the performing quality inspection on the first inner groove to obtain the first correction parameter includes: Selecting a target measurement area in the annular groove; wherein the target measurement area is a portion of the annular groove with the largest dimensional error; Based on the location of the target measurement area, obtaining a first 3D point cloud corresponding to the first inner groove; Comparing the first 3D point cloud with the first standard 3D point cloud to obtain a first comparison difference; wherein the first standard 3D point cloud is a 3D point cloud constructed based on the standard first inner groove; The first contrast difference is converted into a first correction parameter.

[0006] Optionally, selecting a target measurement area in the annular groove includes: Selecting multiple initial measurement areas along the annular groove; wherein the multiple initial measurement areas can be spliced ​​into a complete annular groove area; Acquire a depth image corresponding to each initial measurement area; According to the depth image, the depth information of each initial measurement area is obtained; Compare the multiple depth information with the standard depth respectively to select the target depth information; wherein the target depth information is the depth information with the largest difference with the standard depth; The initial measurement area corresponding to the target depth information is marked as the target measurement area.

[0007] Optionally, the performing quality inspection on the second inner groove to determine whether the second inner groove meets qualification requirements includes: Obtaining a second 3D point cloud corresponding to the second inner groove; According to the second 3D point cloud, obtain first point cloud coordinates corresponding to the first inflection point and second point cloud coordinates corresponding to the second inflection point; wherein the first inflection point is a connection point between the first fillet and the first inclined surface, and the second inflection point is a connection point between the second fillet and the first inclined surface; Obtaining a measured slope of the first inclined surface according to the first point cloud coordinates and the second point cloud coordinates; It is determined whether the measured slope is within the allowable error range. If so, it is determined that the second inner groove meets the qualification requirements. If not, it is determined that the second inner groove does not meet the qualification requirements.

[0008] Optionally, obtaining the second correction parameter includes: Comparing the second 3D point cloud with the second standard 3D point cloud to obtain a second comparison difference; wherein the second standard 3D point cloud is a 3D point cloud constructed based on the standard second inner groove; The second contrast difference is converted into a second correction parameter.

[0009] Optionally, the same surface of the annular groove, the first inner groove and the second inner groove is connected to form a second inclined surface; The switching machining tool continues turning along the other side of the annular groove on the inner wall of the target cylindrical workpiece to roughly machine a circle of second inner grooves, including: Selecting a first tool to roughly machine a first area of ​​a second inner groove on the inner wall of the target cylindrical workpiece along the other side of the annular groove; wherein the angle between the blade and the tool rod in the first tool is a right angle, and the first area covers the entire area of ​​the first fillet and a partial area of ​​the first bevel; Switch to the second tool and continue to rough-machine the remaining second area of ​​the second inner groove along the first area to rough-machine the complete second inner groove; wherein the angle between the blade and the tool rod in the second tool is an obtuse angle, and the second area covers the entire area of ​​the second fillet and the remaining area of ​​the first bevel.

[0010] Optionally, the switching of the machining tool to perform finish machining on the second inner groove comprises: Selecting a third tool to finish the first fillet and the first chamfer along the inner wall of the second inner groove; wherein the angle between the blade of the third tool and the tool rod is a right angle, and the end of the blade of the third tool is arc-shaped; Switch the fourth tool so that the fourth tool continues to finish the second fillet and the remaining surface of the inner wall of the second inner groove along the tool connection point; wherein the tool connection point is the connection point of the second fillet and the first bevel, the angle between the blade of the fourth tool and the tool rod is an obtuse angle, and the end of the blade of the fourth tool is arc-shaped.

[0011] Optionally, the blades in the first tool, the second tool, the third tool and the fourth tool are all integrally connected with a tool pad, and the tool pad is connected to the tool rod through a locking mechanism.

[0012] The beneficial effects that this application can achieve are as follows: When machining the inner groove on the inner wall of the target cylindrical workpiece, the present application adopts segmented machining, firstly, a simpler annular groove is turned out by a common machining tool, and then, for machining the first inner groove with a more complex position, the applicable machining tool is switched, and the first inner groove is rough-machined first. At this time, the rough-machined first inner groove is quality inspected to obtain machining error data, so as to obtain the first correction coefficient, that is, the initial process parameters can be adjusted by the first correction coefficient, and the adjusted process parameters can be used to guide the subsequent fine machining, so as to machine the first inner groove with higher precision, and then after the second inner groove is rough-machined, the quality inspection is also performed to obtain the corresponding machining error data, but because the second inner groove has sequentially connected The complex inner cavity structure formed by the first fillet, the first bevel and the second fillet has relatively complex processing parameters. If the initial process parameters are adjusted according to the error data each time, it will increase the difficulty of subsequent fine processing, and complex calculation of the second correction parameters is required, which reduces the processing efficiency. Therefore, here we first judge whether the processing error data after the quality inspection of the second inner groove is within the error range, that is, whether it meets the qualification requirements. If so, no adjustment is required, and the second inner groove is continued to be fine-processed according to the initial process parameters and the corresponding processing tool is selected. If not, the second correction parameters are calculated to adjust the initial process parameters. Finally, the corresponding processing tool is selected to fine-process the second inner groove to obtain a complete inner groove. In summary, the present application adopts segmented processing for complex special-shaped internal grooves, decomposing them into three grooves to be processed (i.e., the annular groove, the first internal groove, and the second internal groove), and adopts corresponding processing tools for processing, which reduces the processing difficulty. At the same time, the quality inspection is carried out after rough processing, and then fine processing is carried out to improve the processing accuracy. At the same time, the initial process parameters are selectively adjusted for the more complex second internal groove, thereby achieving an effective balance between processing accuracy and processing efficiency, and meeting the overall processing requirements of the internal groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0014] Figure 1 It is a schematic flow chart of a method for processing a special-shaped inner groove in an embodiment of the present application; Figure 2 is a schematic structural diagram of a target cylindrical workpiece in an embodiment of the present application; Figure 3 It is a schematic diagram of the partial structure of the inner groove to be processed of the target cylindrical workpiece in the embodiment of the present application; Figure 4Schematic diagram of the processing sequence when processing the first inner groove in the embodiment of the present application; Figure 5 Schematic diagram of the processing sequence when processing the second inner groove in the embodiment of the present application; Figure 6 Schematic diagram of the general structure of each tool in the embodiments of the present application.

[0015] Reference numerals: 110-target cylindrical workpiece, 120-inner groove to be processed, 121-annular groove, 122-first inner groove, 123-second inner groove, 130-first tool, 140-second tool, 150-third tool, 160-fourth tool, 170-blade, 180-tool rod, 190-tool pad, 210-locking mechanism.

[0016] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0019] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0021] Example Reference Figure 1-Figure 6 This embodiment provides a method for processing a special-shaped inner groove, comprising the following steps: Obtaining initial process parameters of the inner groove 120 to be processed of the target cylindrical workpiece 110; wherein the inner groove 120 to be processed includes an annular groove 121 formed along the inner wall of the target cylindrical workpiece 110, and a first inner groove 122 and a second inner groove 123 extending from both sides of the annular groove 121; According to the initial process parameters, a corresponding machining tool is selected to turn a circle of annular grooves 121 on the inner wall of the target cylindrical workpiece 110; Switch the machining tool, and continue turning along one side of the annular groove 121 on the inner wall of the target cylindrical workpiece 110 to roughly machine a circle of first inner groove 122; wherein one end of the first inner groove 122 away from the annular groove 121 is a plane; Performing a quality inspection on the first inner groove 122 to obtain a first correction parameter; Adjusting the initial process parameters according to the first correction parameters, and switching the machining tool to perform finish machining on the first inner groove 122; Switch the machining tool, and continue turning along the other side of the annular groove 121 on the inner wall of the target cylindrical workpiece 110 to roughly machine a circle of the second inner groove 123; wherein the second inner groove 123 has a first fillet and a second fillet at one end away from the annular groove 121, and a first inclined surface is connected between the first fillet and the second fillet; Performing a quality inspection on the second inner groove 123 to determine whether the second inner groove 123 meets the qualification requirements; If yes, the machining tool is switched according to the initial process parameters to perform finish machining on the second inner groove 123 ; If not, the second correction parameter is obtained, the initial process parameter is adjusted according to the second correction parameter, and the machining tool is switched to perform finish machining on the second inner groove 123 .

[0022] In this embodiment, when machining the inner groove on the inner wall of the target cylindrical workpiece 110, segmented machining is adopted. First, a relatively simple annular groove 121 is turned by a common machining tool. Then, for machining the first inner groove 122 with a relatively complex position, an applicable machining tool is switched. The first inner groove 122 is first roughly machined. At this time, the rough-machined first inner groove 122 is quality inspected to obtain machining error data, thereby obtaining a first correction coefficient. The initial process parameters can be adjusted by the first correction coefficient, and the adjusted process parameters can be used to guide subsequent fine machining, thereby machining the first inner groove 122 with higher precision. Then, after the second inner groove 123 is roughly machined, a quality inspection is also performed to obtain corresponding machining error data. However, due to the second inner groove 123, the second inner groove 123 is roughly machined. 123 has a complex inner cavity structure formed by a first fillet, a first chamfer and a second fillet connected in sequence. Its processing parameters are relatively complex. If the initial process parameters are adjusted according to the error data each time, it will increase the difficulty of subsequent fine processing, and it is necessary to perform complex calculation of the second correction parameters, which reduces the processing efficiency. Therefore, here, the processing error data after the quality inspection of the second inner groove 123 is first judged whether it is within the error range, that is, whether it meets the qualification requirements. If so, no adjustment is required, and the second inner groove 123 is continued to be fine-processed according to the initial process parameters and the corresponding processing tool is selected. If not, the second correction parameters are calculated to adjust the initial process parameters. Finally, the corresponding processing tool is selected to fine-process the second inner groove 123, and a complete inner groove can be obtained. In summary, the present application adopts segmented processing for complex special-shaped internal grooves, decomposing them into three grooves to be processed (i.e., the annular groove 121, the first internal groove 122, and the second internal groove 123), and adopts corresponding processing tools for processing, thereby reducing the processing difficulty. At the same time, the rough processing is followed by quality inspection, and then fine processing is performed to improve the processing accuracy. At the same time, the initial process parameters are selectively adjusted for the more complex second internal groove 123, thereby achieving an effective balance between processing accuracy and processing efficiency, thereby meeting the overall processing requirements of the internal grooves.

[0023] It should be noted that, since the bottom surface of the first inner groove 122 is a plane, its overall structure is relatively regular and simple compared to the second inner groove 123, so its accuracy can be guaranteed as much as possible, so the first correction coefficient can be calculated quickly without affecting work efficiency.

[0024] As an optional implementation, the quality inspection of the first inner groove 122 to obtain the first correction parameter includes: A target measurement area is selected in the annular groove 121; wherein the target measurement area is the part of the annular groove 121 where the dimensional error is the largest; Based on the location of the target measurement area, a first 3D point cloud corresponding to the first inner groove 122 is obtained; Comparing the first 3D point cloud with the first standard 3D point cloud to obtain a first comparison difference; wherein the first standard 3D point cloud is a 3D point cloud constructed based on the standard first inner groove 122; The first contrast difference is converted into a first correction parameter.

[0025] In this embodiment, when the quality inspection of the first inner groove 122 is performed, since the processing error of the annular groove 121 will cause corresponding processing errors to the subsequent first inner groove 122, the part with the largest dimensional error in the annular groove 121 is first found and used as the target measurement area. Based on the location of the area as the measurement point, laser measurement is used to construct a first 3D point cloud that can reflect the three-dimensional contour appearance of the first inner groove 122. The first 3D point cloud obtained at this time can characterize the part with the largest error of the first inner groove 122. The first 3D point cloud is then compared with the first standard 3D point cloud to obtain a first comparison difference, which can be converted into a first correction parameter to correct the subsequent fine processing error, thereby achieving accurate quality inspection of the first inner groove 122 to ensure subsequent processing accuracy.

[0026] As an optional implementation, the selecting of the target measurement area in the annular groove 121 includes: Select multiple initial measurement areas along the annular groove 121; wherein the multiple initial measurement areas can be spliced ​​into a complete annular groove 121 area; Acquire a depth image corresponding to each initial measurement area; According to the depth image, the depth information of each initial measurement area is obtained; Compare the multiple depth information with the standard depth respectively to select the target depth information; wherein the target depth information is the depth information with the largest difference with the standard depth; The initial measurement area corresponding to the target depth information is marked as the target measurement area.

[0027] In this embodiment, when searching for the target measurement area, the annular groove 121 can be divided into multiple arc grooves, each arc groove corresponding to an initial measurement area. However, if each initial measurement area is measured by constructing a 3D point cloud, the measurement efficiency will be relatively low. The structure of the annular groove 121 is relatively simple, and the processing error is relatively low. There is no need to use a high-precision 3D point cloud for measurement. Therefore, the depth image corresponding to each initial measurement area can be obtained by a depth camera to calculate the depth information of each initial measurement area. Due to the error between the tool rotation center and the machining center axis, the machining depth of different areas of the annular groove 121 may deviate. Therefore, multiple depth information are compared with the standard depth respectively, and the depth information with the largest difference between the two is used as the target depth information. The initial measurement area corresponding to the target depth information can be marked as the target measurement area, while ensuring measurement efficiency and accuracy.

[0028] As an optional implementation manner, the quality inspection of the second inner groove 123 to determine whether the second inner groove 123 meets the qualification requirements includes: Obtain a second 3D point cloud corresponding to the second inner groove 123; According to the second 3D point cloud, obtain first point cloud coordinates corresponding to the first inflection point and second point cloud coordinates corresponding to the second inflection point; wherein the first inflection point is a connection point between the first fillet and the first inclined surface, and the second inflection point is a connection point between the second fillet and the first inclined surface; Obtaining a measured slope of the first inclined surface according to the first point cloud coordinates and the second point cloud coordinates; It is determined whether the measured slope is within the allowable error range. If so, it is determined that the second inner groove 123 meets the qualification requirements. If not, it is determined that the second inner groove 123 does not meet the qualification requirements.

[0029] In the present embodiment, when the second inner groove 123 is quality inspected, since the structure of the second inner groove 123 is relatively complex, a point cloud measurement method with higher precision is adopted. The second 3D point cloud corresponding to the second inner groove 123 as a whole is first constructed, and the first point cloud coordinates corresponding to the first inflection point and the second point cloud coordinates corresponding to the second inflection point can be obtained. The first inflection point is the connection point of the first fillet and the first inclined surface, and the second inflection point is the connection point of the second fillet and the first inclined surface. The first inflection point and the second inflection point are the positions most susceptible to processing errors. Therefore, the point cloud coordinates of the two inflection points are used as measurement points here, which is more representative and targeted. Then, the measured slope of the first inclined surface can be calculated according to the first point cloud coordinates and the second point cloud coordinates. Any offset of the first point cloud coordinates and the second point cloud coordinates will cause a corresponding change in the measured slope of the first inclined surface. Here, a range value of the slope (i.e., the allowable error range) can be set according to the change amplitude. That is, by judging whether the measured slope is within the allowable error range, it can be effectively judged whether the second inner groove 123 meets the qualification requirements.

[0030] As an optional implementation manner, obtaining the second correction parameter includes: Comparing the second 3D point cloud with the second standard 3D point cloud to obtain a second comparison difference; wherein the second standard 3D point cloud is a 3D point cloud constructed based on the standard second inner groove 123; The second contrast difference is converted into a second correction parameter.

[0031] In this embodiment, when calculating the second correction parameter, similarly, the second 3D point cloud can be directly compared with the second standard 3D point cloud to obtain a second comparison difference, which can eventually be converted into the second correction parameter.

[0032] As an optional embodiment, the same surface of the annular groove 121, the first inner groove 122 and the second inner groove 123 is connected to form a second inclined surface; The switching machining tool continues turning along the other side of the annular groove 121 on the inner wall of the target cylindrical workpiece 110 to roughly machine a circle of the second inner groove 123, including: A first tool 130 is selected to roughly machine a first area of ​​the second inner groove 123 on the inner wall of the target cylindrical workpiece 110 along the other side of the annular groove 121; wherein the angle between the blade 170 and the tool rod 180 in the first tool 130 is a right angle, and the first area covers the entire area of ​​the first fillet and a partial area of ​​the first bevel; Switch the second tool 140 and continue to rough-machine the remaining second area of ​​the second inner groove 123 along the first area to rough-machine the complete second inner groove 123; wherein the angle between the blade 170 and the tool rod 180 in the second tool 140 is an obtuse angle, and the second area covers the entire area of ​​the second fillet and the remaining area of ​​the first bevel.

[0033] In the present embodiment, since the second inclined surface is formed on the same surface of the annular groove 121, the first inner groove 122 and the second inner groove 123, in order to further reduce the difficulty of processing and prevent processing interference problems, the processing is divided into two stages. First, a right-angle rough processing tool (i.e., the first tool 130) is used to turn out a part of the second inner groove 123 (i.e., the first area). The first area is mainly for the entire area of ​​the first fillet and a partial area of ​​the first inclined surface. Then, the rough processing tool with an obtuse angle (i.e., the second tool 140) is switched to continue processing. The obtuse-angled second tool 140 can effectively avoid interference with the second inclined surface, thereby processing the remaining part of the second inner groove 123 (i.e., the second area), and finally realizing the rough processing of the second inner groove 123.

[0034] As an optional implementation, the switching of the machining tool to perform finish machining on the second inner groove 123 includes: Select the third tool 150 to finish the first fillet and the first chamfer along the inner wall of the second inner groove 123; wherein the angle between the blade 170 of the third tool 150 and the tool rod 180 is a right angle, and the end of the blade 170 of the third tool 150 is arc-shaped; Switch the fourth tool 160 so that the fourth tool 160 continues to finish the second fillet and the remaining surface of the inner wall of the second inner groove 123 along the tool connection point; wherein the tool connection point is the connection point of the second fillet and the first bevel, the angle between the blade 170 of the fourth tool 160 and the tool rod 180 is an obtuse angle, and the end of the blade 170 of the fourth tool 160 is arc-shaped.

[0035] In the present embodiment, similarly, during fine machining, in order to prevent interference problems, a right-angled fine machining tool (i.e., the third tool 150) is first used to fine-machine the first fillet and the first bevel along the inner wall of the second inner groove 123, and then the tool is switched to a blunt-angled fine machining tool (i.e., the fourth tool 160) to continue to fine-machine the second fillet and the remaining surface of the inner wall of the second inner groove 123. The connection point after switching the tool for the second fine machining is selected as the connection point of the second fillet and the first bevel. On the one hand, it ensures the continuity and integrity of the fine machining of the second fillet and the first bevel, reduces the positioning error caused by changing the tool after only fine machining part of the first bevel or the second fillet, improves the machining accuracy, and on the other hand, effectively avoids interference problems.

[0036] As an optional implementation, the blades 170 in the first tool 130 , the second tool 140 , the third tool 150 and the fourth tool 160 are all integrally connected with a tool pad 190 , and the tool pad 190 is connected to the tool rod 180 via a locking mechanism 210 .

[0037] In this embodiment, the blade 170 and the knife pad 190 of each tool are formed into an integrated structure, so that the structural strength of the blade 170 is improved, and the risk of the blade 170 breaking can be reduced, thereby increasing the overall service life of the tool. Here, the locking mechanism 210 can adopt a locking structure composed of a screw and a pressure block.

[0038] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for processing a special-shaped inner groove, characterized in that: The following steps are involved: Acquire initial process parameters of an inner groove to be processed of a target cylindrical workpiece; wherein the inner groove to be processed comprises an annular groove formed along an inner wall of the target cylindrical workpiece, and a first inner groove and a second inner groove are formed on both sides of the annular groove; According to the initial process parameters, a corresponding machining tool is selected to turn a circle of annular grooves on the inner wall of the target cylindrical workpiece; Switching the machining tool, continuing turning along one side of the annular groove on the inner wall of the target cylindrical workpiece to roughly machine a circle of first inner groove; wherein one end of the first inner groove away from the annular groove is a plane; Performing a quality inspection on the first inner groove to obtain a first correction parameter; adjusting the initial process parameters according to the first correction parameters, and switching the machining tool to perform finish machining on the first inner groove; Switching the machining tool, continuing turning along the other side of the annular groove on the inner wall of the target cylindrical workpiece to roughly machine a circle of the second inner groove; wherein the second inner groove has a first rounded corner and a second rounded corner at one end away from the annular groove, and a first inclined surface is connected between the first rounded corner and the second rounded corner; Performing a quality inspection on the second inner groove to determine whether the second inner groove meets the qualification requirements, if so, switching the machining tool according to the initial process parameters to perform fine machining on the second inner groove, if not, obtaining a second correction parameter; The initial process parameters are adjusted according to the second correction parameters, and the machining tool is switched to perform finish machining on the second inner groove.

2. A method for processing a special-shaped inner groove according to claim 1, characterized in that: The step of performing a quality inspection on the first inner groove to obtain a first correction parameter includes: Selecting a target measurement area in the annular groove; wherein the target measurement area is a portion of the annular groove with the largest dimensional error; Based on the location of the target measurement area, obtaining a first 3D point cloud corresponding to the first inner groove; Comparing the first 3D point cloud with a first standard 3D point cloud to obtain a first comparison difference; wherein the first standard 3D point cloud is a 3D point cloud constructed based on a standard first inner groove; The first contrast difference is converted into a first correction parameter.

3. A method for processing a special-shaped inner groove according to claim 2, characterized in that: The step of selecting a target measurement area in the annular groove comprises: Selecting a plurality of initial measurement areas along the annular groove; wherein the plurality of initial measurement areas can be spliced ​​into a complete annular groove area; Acquire a depth image corresponding to each of the initial measurement areas; Acquire depth information of each of the initial measurement areas according to the depth image; Compare the plurality of depth information with the standard depth respectively to select target depth information; wherein the target depth information is the depth information with the largest difference from the standard depth; The initial measurement area corresponding to the target depth information is marked as a target measurement area.

4. A method for processing a special-shaped inner groove according to any one of claims 1 to 3, characterized in that: The performing of quality inspection on the second inner groove to determine whether the second inner groove meets qualification requirements includes: Acquire a second 3D point cloud corresponding to the second inner groove; According to the second 3D point cloud, obtaining first point cloud coordinates corresponding to the first inflection point and second point cloud coordinates corresponding to the second inflection point; wherein the first inflection point is a connection point between the first fillet and the first inclined surface, and the second inflection point is a connection point between the second fillet and the first inclined surface; Acquire the measured slope of the first inclined surface according to the first point cloud coordinates and the second point cloud coordinates; It is determined whether the measured slope is within an allowable error range. If so, it is determined that the second inner groove meets the qualification requirements. If not, it is determined that the second inner groove does not meet the qualification requirements.

5. A method for processing a special-shaped inner groove according to claim 4, characterized in that: The obtaining of the second correction parameter comprises: Comparing the second 3D point cloud with a second standard 3D point cloud to obtain a second comparison difference; wherein the second standard 3D point cloud is a 3D point cloud constructed based on a standard second inner groove; The second contrast difference is converted into a second correction parameter.

6. A method for processing a special-shaped inner groove according to claim 1, characterized in that: The same surface of the annular groove, the first inner groove and the second inner groove is connected to form a second inclined surface; The switching machining tool continues turning along the other side of the annular groove on the inner wall of the target cylindrical workpiece to roughly machine a circle of second inner grooves, including: Select a first tool to roughly machine a first area of ​​a second inner groove on the inner wall of the target cylindrical workpiece along the other side of the annular groove; wherein the angle between the blade and the tool rod in the first tool is a right angle, and the first area covers the entire area of ​​the first fillet and a partial area of ​​the first bevel; Switch to the second tool and continue to rough-machine the remaining second area of ​​the second inner groove along the first area to rough-machine a complete second inner groove; wherein the angle between the blade and the tool rod in the second tool is an obtuse angle, and the second area covers the entire area of ​​the second fillet and the remaining area of ​​the first bevel.

7. A method for processing a special-shaped inner groove according to claim 6, characterized in that: The switching of the machining tool to perform finish machining on the second inner groove comprises: Selecting a third tool to finish the first fillet and the first chamfer along the inner wall of the second inner groove; wherein the angle between the blade of the third tool and the tool rod is a right angle, and the end of the blade of the third tool is arc-shaped; Switch the fourth tool so that the fourth tool continues to finish the second fillet and the remaining surface of the inner wall of the second inner groove along the tool connection point; wherein the tool connection point is the connection point of the second fillet and the first bevel, the angle between the blade of the fourth tool and the tool rod is an obtuse angle, and the end of the blade of the fourth tool is arc-shaped.

8. A method for processing a special-shaped inner groove according to claim 7, characterized in that: The blades of the first tool, the second tool, the third tool and the fourth tool are all integrally connected with a knife pad, and the knife pad is connected to the knife rod through a locking mechanism.

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