A detection part and precision detection method

Abstract

The present invention provides a detection component and a precision detection method, wherein the detection component can more comprehensively detect the linkage precision between interpolation axes of a numerically controlled machine tool, thereby improving the accuracy of determining the precision of the numerically controlled machine tool.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of numerical control technology, and in particular to a detection component and a precision detection method. Background Art

[0002] With the development of modern manufacturing technology, CNC equipment has been widely used. In practical applications, comprehensive testing of the linkage accuracy and processing performance of each interpolation axis of the machine tool is a necessary step to ensure the accuracy of workpiece manufacturing.

[0003] In the prior art, a dedicated detection tool is usually used to measure the accuracy of a CNC machine tool, but the detection tool cannot reflect the linkage accuracy of each axis in a multi-axis linkage situation of the CNC machine tool. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a detection component and a precision detection method, which solves the problem that the existing precision detection of CNC machine tools is not comprehensive enough.

[0005] To achieve the above-mentioned objectives, in a first aspect, an embodiment of the present invention provides a detection component for detecting the linkage accuracy of each axis of a CNC machine tool, wherein the detection component includes a cylindrical base, the cylindrical base including a first side wall, a first side surface, and a second side surface, the first side surface being opposite to the second side surface, and the first side wall being perpendicular to both the first side surface and the second side surface; a first groove is formed on the first side wall, the cross section of the first groove along a first plane is U-shaped, the first plane extends radially along the cylindrical base, the first groove extends circumferentially along the first side wall, and the first groove divides the first side wall into a first sub-side wall and a second sub-side wall, the first sub-side wall is adjacent to the first side surface, and the second sub-side wall is adjacent to the second side surface;

[0006] A second groove is formed at a first position on the side wall of the target sub-body, and the groove of the second groove is S-shaped; a third groove is formed at a second position on the side wall of the target sub-body, and the opening and the groove bottom of the third groove are both rectangular, and the groove wall of the third groove is perpendicular to the groove bottom; a fourth groove is formed at a third position on the side wall of the target sub-body, and the opening and the groove bottom of the fourth groove are both circular, and the groove wall of the fourth groove is perpendicular to the groove bottom;

[0007] The target sub-sidewall is at least one of the first sub-sidewall and the second sub-sidewall.

[0008] Optionally, the third position coincides with the second position, a circular boss is formed in the third groove, and the fourth groove is formed on the circular boss.

[0009] Optionally, a second plane is formed at a fourth position of the target sub-side wall, and the second plane is rectangular.

[0010] Optionally, at least one blind hole is provided on the second plane.

[0011] Optionally, the inner wall of the blind hole is provided with threads.

[0012] Optionally, a first boss is formed on the first side surface, the first boss includes a second side wall, the second side wall is perpendicular to the first side surface, and the orthographic projection of the second side wall on the first side surface is a straight line.

[0013] Optionally, the first boss includes a third side surface, the third side surface is parallel to the first side surface, and at least one screw hole is formed on the third side surface.

[0014] Optionally, the first boss includes a third side surface, the third side surface is parallel to the first side surface, a second boss is formed on the third side surface, the second boss includes a third side wall, the third side wall is perpendicular to the third side surface, and the orthographic projection of the third side wall on the third side surface is a straight line;

[0015] A through slot is formed on the second boss, and the through slot includes a fourth side wall. The fourth side wall is adjacent to the third side wall and perpendicular to the third side surface. The orthographic projection of the fourth side wall on the third side surface is a curve.

[0016] Optionally, the second boss includes a fourth side surface, the fourth side surface is parallel to the first side surface, a third boss is formed on the fourth side surface, the third boss includes a fifth side wall, the fifth side wall is perpendicular to the fourth side surface, and the positive projection of the fifth side wall on the fourth side surface is a curve.

[0017] In a second aspect, an embodiment of the present invention provides an accuracy detection method applied to a CNC machine tool, the method comprising:

[0018] Processing the first workpiece according to a preset processing program to obtain a second workpiece, where the second workpiece is the inspection piece provided by the first aspect of the embodiment of the present invention;

[0019] Measuring the size, shape and position of the second workpiece to obtain detection data of the second workpiece;

[0020] obtaining an inspection score for the second workpiece based on a difference between the inspection data of the second workpiece and preset data, the preset data being determined based on an engineering drawing of the second workpiece;

[0021] The accuracy of the CNC machine tool is determined according to the detection score of the second workpiece.

[0022] Optionally, after determining the accuracy of the CNC machine tool based on the detection data of the second workpiece, the method further includes:

[0023] determining the performance level of the CNC machine tool based on historical test data;

[0024] The historical detection data is detection data of M workpieces collected in advance, the M workpieces include the second workpiece, and M is a positive integer.

[0025] One of the above technical solutions has the following advantages or beneficial effects:

[0026] An embodiment of the present invention provides a detection component and a precision detection method, wherein the detection component can more comprehensively detect the linkage precision between the interpolation axes of a CNC machine tool, thereby improving the accuracy of determining the precision of the CNC machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional schematic diagram of a detection component provided by an embodiment of the present invention;

[0028] Figure 2 One of the side views of a detection component provided by an embodiment of the present invention;

[0029] Figure 3 A second side view of a detection component provided by an embodiment of the present invention;

[0030] Figure 4 A third side view of a detection component provided by an embodiment of the present invention;

[0031] Figure 5 A top view of a detection component provided by an embodiment of the present invention;

[0032] Figure 6 One of the flow charts of an accuracy detection method provided by an embodiment of the present invention;

[0033] Figure 7 The second flowchart of an accuracy detection method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] The term "comprise" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to the process, method, product, or apparatus. In addition, the use of "and / or" in the specification and claims to indicate at least one of the connected objects, such as A and / or B, means that A alone, B alone, and both A and B are included.

[0036] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0037] See Figures 1 to 5 , a detection component provided by an embodiment of the present invention.

[0038] like Figures 1 to 5 As shown, the detection member includes a cylindrical base 100, and the cylindrical base 100 includes a first side wall, a first side surface, and a second side surface. The first side surface is opposite to the second side surface, and the first side wall is perpendicular to the first side surface and the second side surface. A first groove 110 is formed on the first side wall, and the cross section of the first groove 110 along the first plane is U-shaped. The first plane extends radially along the cylindrical base 100, as shown in FIG. Figure 2 As shown. The first groove 110 extends along the circumference of the first sidewall, and the first groove 110 separates the first sidewall into a first sub-sidewall and a second sub-sidewall, the first sub-sidewall is adjacent to the first side surface, and the second sub-sidewall is adjacent to the second side surface;

[0039] A second groove 120 is formed at a first position on the side wall of the target, and the groove of the second groove 120 is S-shaped; a third groove 130 is formed at a second position on the side wall of the target, and the opening and bottom of the third groove 130 are both rectangular, and the groove wall of the third groove 130 is perpendicular to the groove bottom; a fourth groove 140 is formed at a third position on the side wall of the target, and the opening and bottom of the fourth groove 140 are both circular, and the groove wall of the fourth groove 140 is perpendicular to the groove bottom;

[0040] The target sub-sidewall is at least one of the first sub-sidewall and the second sub-sidewall.

[0041] In the embodiment of the present invention, the detection part can be processed by a turning and milling CNC machine tool. The detection part includes a cylindrical base 100, which can be formed by cutting the external cylindrical turning tool of the CNC machine tool and can be used to detect the cutting accuracy of the external cylindrical turning tool of the CNC machine tool and the linkage accuracy between it and other interpolation axes. The cylindrical base 100 includes a first side wall, a first side surface and a second side surface, wherein the first side wall can be understood as follows. Figure 1 The circumferential wall of the cylindrical base 100 shown in FIG. 1 , the first side surface can be understood as follows Figure 1 The upper side shown, the second side can be understood as Figure 1 The underside is shown.

[0042] The first side wall of the cylindrical base 100 is cut by an arc turning tool to form a first groove 110. The first groove 110 can be used to detect the cutting accuracy of the arc turning tool on the CNC machine tool and the linkage accuracy between the arc turning tool and other interpolation axes. Figure 2 As shown, the channel of the first groove 110 surrounds the side wall of the cylindrical base 100 , dividing the side wall of the cylindrical base 100 into the first sub-side wall and the second sub-side wall.

[0043] Here, the target sub-side wall is taken as the first sub-side wall as an example for explanation. By milling the first sub-side wall of the cylindrical base 100 with an end mill, a second groove 120 can be formed at a first position on the sub-side wall of the cylindrical base, a third groove 130 can be formed at a second position, and a fourth groove 140 can be formed at a third position. Specifically, Figure 2 As shown, the first sub-side wall of the cylindrical base 100 is subjected to S-shaped milling by an end mill to form a second groove 120. The second groove 120 can be used to detect the accuracy of the S-shaped milling of the side surface by the end mill on the CNC machine tool and the linkage accuracy between it and other interpolation axes. Figure 3 As shown, the first sub-side wall of the cylindrical base 100 is squared by an end mill to form a third groove 130. The third groove 130 can be used to detect the accuracy of the side squared milling performed by the end mill on the CNC machine tool and the linkage accuracy between the end mill and other interpolation axes. Figure 3 As shown, by performing square milling processing on the first sub-side wall of the cylindrical base 100 through a vertical milling cutter, a fourth groove 140 can be formed. The fourth groove 140 can be used to detect the accuracy of the side circular milling performed by the vertical milling cutter on the CNC machine tool and the linkage accuracy between it and other interpolation axes.

[0044] In the embodiment of the present invention, the detection component can more comprehensively detect the linkage accuracy between the interpolation axes of the CNC machine tool, thereby improving the accuracy of determining the accuracy of the CNC machine tool.

[0045] In an optional embodiment, the third position coincides with the second position, a circular boss is formed in the third groove 130 , and a fourth groove 140 is formed on the circular boss.

[0046] In this embodiment, if Figure 3 As shown, the third groove 130 and the fourth groove 140 are opened at the same position on the side wall of the cylindrical base 100, which can simultaneously detect the accuracy of the side square milling and side circular milling of the end mill and the linkage accuracy between the end mill and other interpolation axes. The end mill can be a D6 milling cutter.

[0047] In an optional embodiment, a second plane 150 is formed at the fourth position of the target sub-side wall, and the second plane 150 is rectangular.

[0048] In this embodiment, the target sub-side wall is taken as the first sub-side wall for illustration. The first sub-side wall of the cylindrical base 100 is subjected to lateral plane milling by an end mill to obtain a second plane 150, such as Figure 4 The second plane 150 can be used to detect the accuracy of the lateral plane milling performed by the end mill on the CNC machine tool and the linkage accuracy between it and other interpolation axes. The end mill can be a D10 milling cutter.

[0049] In this embodiment, in one implementation form, as Figure 4 As shown, at least one blind hole 151 is provided on the second plane 150. In this implementation form, the blind hole 151 can be understood as a side hole of the cylindrical base 100, whose axial direction is perpendicular to the axial direction of the cylindrical base 100. The blind hole 151 can be obtained by drilling the second plane 150 with a forming drill bit, and can be used to detect the lateral drilling accuracy of the forming drill bit on the CNC machine tool and the linkage accuracy between it and other interpolation axes. The forming drill bit can be a D3.3 forming drill bit. Furthermore, the inner wall of the blind hole 151 is provided with a thread, and the thread can be tapped on the side of the blind hole 151 by a tap to form a thread on the inner wall of the blind hole 151. The blind hole 151 can be used to detect the drilling accuracy of the forming drill bit on the CNC machine tool and the linkage accuracy between it and other interpolation axes; the thread on the inner wall of the blind hole 151 can be used to detect the drilling accuracy of the forming drill bit on the CNC machine tool and the linkage accuracy between it and other interpolation axes.

[0050] It should be noted that the present embodiment does not limit the number of blind holes 151 opened on the second plane 150, and can be one, two, three or more. If the number of blind holes 151 is multiple, the multiple blind holes 151 can be evenly spaced and distributed on the second plane 150, such as Figure 4It is understood that the number and location of the blind holes 151 can be determined based on actual conditions, and this embodiment does not limit this.

[0051] In another implementation, a string 152 may be provided on the second plane 150, such as Figure 1 In this implementation, a lettering knife can be used to perform lateral plane lettering on the second plane 150 to form a character string 152 on the second plane 150, which is used to detect the accuracy of the lettering knife in performing lateral plane lettering and the linkage accuracy between the lettering knife and other interpolation axes.

[0052] In an optional embodiment, a first boss 200 is formed on the first side surface. The first boss 200 includes a second side wall. The second side wall is perpendicular to the first side surface, and the orthographic projection of the second side wall on the first side surface is a straight line.

[0053] In this embodiment, if Figure 1 As shown, the first boss 200 includes the second sidewall, which is a straight wall and can be formed by milling the Y-axis precision milling bottom platform of the cylindrical base 100 using an end mill of a CNC machine tool. This is used to test the accuracy of the end mill performing axial straight wall milling on the CNC machine tool and the accuracy of its linkage with other interpolation axes. The end mill can be a D10 milling cutter.

[0054] In one implementation, the first boss 200 includes a third side surface, which is parallel to the first side surface and has at least one screw hole 210 defined thereon. In this implementation, the screw hole 210 can be understood as an axial hole in the cylindrical base 100, with its axial direction parallel to the axial direction of the cylindrical base 100. The screw hole 210 can be obtained by drilling and tapping the third side surface using a forming drill bit and a tap. This can be used to test the axial drilling accuracy of forming drill bits on CNC machine tools and the accuracy of their linkage with other interpolation axes. The forming drill bit can be a D3.3 forming drill bit.

[0055] It should be noted that the present embodiment does not limit the number of screw holes 210 provided on the third side surface, and may be one, two, three or more. If the number of screw holes 210 is more than one, the multiple screw holes 210 may be centrally symmetrically distributed on the third side surface, such as Figure 5 It is understood that the number and location of the screw holes 210 can be determined based on actual conditions, and this embodiment does not limit this.

[0056] In one implementation, the first boss 200 includes a third side surface, the third side surface being parallel to the first side surface, the second boss 300 being formed on the third side surface, the second boss 300 including a third side wall, the third side wall being perpendicular to the third side surface, and the orthographic projection of the third side wall on the third side surface being a straight line;

[0057] A through slot 310 is defined on the second boss 300 . The through slot 310 includes a fourth side wall. The fourth side wall is adjacent to the third side wall and perpendicular to the third side surface. The orthographic projection of the fourth side wall on the third side surface is a curve.

[0058] In this embodiment, the second boss 300 includes the third sidewall, which is a straight wall and can be formed by milling the Y-axis precision milling bottom platform of the cylindrical base 100 using an end mill cutter on a CNC machine tool. This is used to test the accuracy of the end mill cutter performing axial straight wall milling on the CNC machine tool and the accuracy of its linkage with other interpolated axes. The end mill cutter can be a D10 milling cutter.

[0059] like Figure 5 As shown, the second boss 300 is further provided with a through groove 310, which passes through the two side walls of the second boss 300. The depth direction of the through groove 310 is parallel to the axial direction of the cylindrical base 100. Therefore, the through groove 310 can be understood as an axial groove. It should be noted that the depth directions of the first groove 110, the second groove 120, the third groove 130 and the fourth groove 140 are all perpendicular to the axial direction of the cylindrical base 100. Therefore, the first groove 110, the second groove 120, the third groove 130 and the fourth groove 140 can be understood as lateral grooves.

[0060] In this embodiment, the through slot 310 can be obtained by milling the fine milling end face with an end mill of a CNC machine tool, and can be used to detect the axial slotting accuracy of the end mill of the CNC machine tool and the linkage accuracy between the end mill and other interpolation axes. The end mill can be a D6 milling cutter.

[0061] Furthermore, in one implementation, the second boss 300 includes a fourth side surface, which is parallel to the first side surface, and a third boss 400 is formed on the fourth side surface. The third boss 400 includes a fifth side wall, which is perpendicular to the fourth side surface, and the positive projection of the fifth side wall on the fourth side surface is a curve.

[0062] In this implementation, the fifth sidewall is an axially curved sidewall, which can be obtained by milling the fine-milled end face using an end mill on a CNC machine tool. This is used to test the milling accuracy of the end mill on the CNC machine tool for fine-milling the axial end face and the accuracy of its linkage with other interpolated axes. The end mill can be a D6 milling cutter.

[0063] In summary, in the embodiment of the present invention, the detection component can more comprehensively detect the linkage accuracy between the interpolation axes of the CNC machine tool, thereby improving the accuracy of determining the accuracy of the CNC machine tool.

[0064] See Figure 6 , Figure 6 This is an accuracy detection method provided by an embodiment of the present invention, which can be applied to CNC machine tools.

[0065] like Figure 6 As shown, the method includes the following steps:

[0066] Step 601: Process a first workpiece according to a preset processing program to obtain a second workpiece, where the second workpiece is the detection part provided in the embodiment of the present invention.

[0067] In the embodiment of the present invention, combined with Figure 7 As shown, the CNC machine tool can process the first workpiece according to the preset processing program. The preset processing program can be understood as a CNC program, which can include a processing program for the inspection part and an operation instruction program, such as information such as the tools to be prepared. The first workpiece is a blank.

[0068] In a specific implementation, the CNC machine tool can prompt the operator, based on the preset machining program, which tool or tools to prepare and provide guidance and prompts for tool installation. After confirming that the tool installation is complete, the CNC machine tool can process the first workpiece based on the preset machining program to obtain the second workpiece. The second workpiece is the inspection part provided in an embodiment of the present invention.

[0069] Step 602: Measure the size, shape and position of the second workpiece to obtain detection data of the second workpiece.

[0070] In an embodiment of the present invention, the second workpiece is a detection part provided in an embodiment of the present invention. By measuring the size and shape and position of the second workpiece, the accuracy of each structure of the second workpiece is detected, and then the processing accuracy of the CNC machine tool and the linkage accuracy between each interpolation axis are determined.

[0071] Step 603: Obtaining an inspection score for the second workpiece based on a difference between the inspection data of the second workpiece and preset data, wherein the preset data is determined based on an engineering drawing of the second workpiece;

[0072] In a specific implementation, the inspection component is pre-determined to have a corresponding engineering drawing model, which records the standard dimensions and standard shapes and positions corresponding to each structure of the inspection component. When the CNC machine tool obtains the second workpiece based on the preset machining program, the dimensions and shapes of the second workpiece are measured to obtain the inspection data of the second workpiece. The CNC machine tool can be pre-set with scoring rules for accuracy inspection, and based on these scoring rules, an inspection score for the inspection data of the second workpiece can be determined.

[0073] Step 604: Determine the accuracy of the CNC machine tool according to the inspection score of the second workpiece.

[0074] In an embodiment of the present invention, by trial processing a workpiece and performing three-coordinate measurement on the second workpiece after the trial processing, the detection data of the second workpiece is obtained, and based on the detection data of the second workpiece, the linkage accuracy between the interpolation axes of the CNC machine tool can be more comprehensively detected, thereby improving the accuracy of determining the accuracy of the CNC machine tool.

[0075] In an optional embodiment, after determining the accuracy of the CNC machine tool based on the detection data of the second workpiece, the method further includes:

[0076] determining the performance level of the CNC machine tool based on historical test data;

[0077] The historical detection data is detection data of M workpieces collected in advance, the M workpieces include the second workpiece, and M is a positive integer.

[0078] In this embodiment, the CNC machine tool can collect historical detection data of a plurality of trial-machined workpieces, and based on the historical detection data, a comprehensive evaluation of the performance of the CNC machine tool can be performed.

[0079] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0080] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0081] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A detection component, characterized in that: The detection component is used to detect the linkage accuracy of each axis of a CNC machine tool. The detection component includes a cylindrical base, the cylindrical base including a first side wall, a first side surface, and a second side surface. The first side surface is opposite to the second side surface, and the first side wall is perpendicular to both the first side surface and the second side surface. A first groove is formed on the first side wall. The cross-section of the first groove along a first plane is U-shaped. The first plane extends radially along the cylindrical base. The first groove extends circumferentially along the first side wall. The first groove divides the first side wall into a first sub-side wall and a second sub-side wall. The first sub-side wall is adjacent to the first side surface, and the second sub-side wall is adjacent to the second side surface. A second groove is formed at a first position on the side wall of the target sub-body, and the groove of the second groove is S-shaped; a third groove is formed at a second position on the side wall of the target sub-body, and the opening and the groove bottom of the third groove are both rectangular, and the groove wall of the third groove is perpendicular to the groove bottom; a fourth groove is formed at a third position on the side wall of the target sub-body, and the opening and the groove bottom of the fourth groove are both circular, and the groove wall of the fourth groove is perpendicular to the groove bottom; Wherein, the target sub-sidewall is at least one of the first sub-sidewall and the second sub-sidewall; The detection member is machined by a turning and milling CNC machine tool, the cylindrical base is formed by cutting with an external cylindrical turning tool of the CNC machine tool, and the first side wall of the cylindrical base is cut by an arc turning tool to form the first groove; the first sub-side wall of the cylindrical base is milled by an end mill to form the second groove at a first position on the target sub-side wall of the cylindrical base, the third groove is formed at a second position, and the fourth groove is formed at a third position; The third position coincides with the second position, a circular boss is formed in the third groove, and the fourth groove is formed on the circular boss; A second plane is formed at the fourth position of the target sub-side wall, and the second plane is rectangular.

2. The detection element according to claim 1, characterized in that: At least one blind hole is defined on the second plane.

3. The detection element according to claim 2, characterized in that: The inner wall of the blind hole is provided with threads.

4. The detection element according to claim 1, characterized in that: A first boss is formed on the first side surface. The first boss includes a second side wall. The second side wall is perpendicular to the first side surface, and an orthographic projection of the second side wall on the first side surface is a straight line.

5. The detection element according to claim 4, characterized in that: The first boss includes a third side surface, the third side surface is parallel to the first side surface, and at least one screw hole is formed on the third side surface.

6. The detection element according to claim 4, characterized in that: The first boss includes a third side surface, the third side surface is parallel to the first side surface, a second boss is formed on the third side surface, the second boss includes a third side wall, the third side wall is perpendicular to the third side surface, and the orthographic projection of the third side wall on the third side surface is a straight line; A through slot is formed on the second boss, and the through slot includes a fourth side wall. The fourth side wall is adjacent to the third side wall and perpendicular to the third side surface. The orthographic projection of the fourth side wall on the third side surface is a curve.

7. The detection element according to claim 6, characterized in that: The second boss includes a fourth side surface, which is parallel to the first side surface. A third boss is formed on the fourth side surface. The third boss includes a fifth side wall, which is perpendicular to the fourth side surface, and the positive projection of the fifth side wall on the fourth side surface is a curve.

8. A precision detection method, applied to CNC machine tools, characterized in that: The method comprises: Processing the first workpiece according to a preset processing program to obtain a second workpiece, wherein the second workpiece is the detection piece according to any one of claims 1 to 7; Measuring the size, shape and position of the second workpiece to obtain detection data of the second workpiece; obtaining an inspection score for the second workpiece based on a difference between the inspection data of the second workpiece and preset data, the preset data being determined based on an engineering drawing of the second workpiece; The accuracy of the CNC machine tool is determined according to the inspection score of the second workpiece.

9. The method according to claim 8, characterized in that After determining the accuracy of the CNC machine tool based on the detection data of the second workpiece, the method further includes: determining the performance level of the CNC machine tool based on historical test data; The historical detection data is detection data of M workpieces collected in advance, the M workpieces include the second workpiece, and M is a positive integer.

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