Indexing accuracy measurement method and indexing accuracy measurement tooling

Abstract

The application provides a method for measuring index accuracy and a tooling for measuring index accuracy, and relates to the technical field of cutters. The method comprises the following steps: acquiring surface profiles corresponding to two surfaces of a to-be-measured blade; taking a line connecting two centers of two blade tip circular arcs on the two surface profiles as a symmetry axis, and determining the symmetry of the two surfaces respectively; and obtaining the index accuracy of the to-be-measured blade according to the difference between the symmetries of the two surfaces. The tooling simply uses a measuring instrument to measure the symmetries of the blade before and after indexing, and the index accuracy can be accurately estimated by taking the difference. The index provided by the application is based on the symmetry measurement principle, and the size of the torsional deformation of the blade indexing is calculated by taking the two blade tip circular arcs as the symmetry reference, so that the relative size of the index accuracy of the blade indexing can be accurately represented, and the method is efficient and convenient.

Description

Technical Field

[0001] This application relates to the field of cutting tool technology, and in particular to a method and fixture for measuring indexing accuracy. Background Technology

[0002] In machining using indexable cutting tools, the insert can be indexed to change the cutting edge, maintaining machining efficiency and quality. Users prioritize the efficiency of tool-change machining, hoping to perform cutting operations without tool setting after changing the cutting edge. Therefore, under the same programming position, higher requirements are placed on the positional accuracy of the tool tip after changing the cutting edge on a single insert and within a batch.

[0003] With advancements in manufacturing technology, the dimensional accuracy of M-grade turning tools circulating in the market is significantly better than established standards. However, the actual machining accuracy of domestically produced turning tools still lags behind that of foreign products. This is because the IC value, M value, and S value in the national standard testing items are no longer sufficient to measure significant differences in modern cutting tools. Tools that meet the factory requirements under these indicators may still have certain discrepancies in actual accuracy.

[0004] Therefore, the current testing indicators used for tool indexing accuracy are unable to identify qualified and defective products under higher precision requirements. There is an urgent need for more accurate and convenient testing methods to identify defective products in advance and scrap them earlier. Summary of the Invention

[0005] To achieve the above objectives, this application provides a method and fixture for measuring indexing accuracy, which can calculate the magnitude of torsional deformation during insert indexing, thereby accurately identifying the relative magnitude of insert indexing accuracy, which is efficient and convenient.

[0006] In a first aspect, this application provides a method for measuring indexing accuracy, the method comprising:

[0007] Obtain the surface profiles corresponding to the two relatively set surfaces of the blade under test;

[0008] The symmetry of the two surfaces is determined by taking the line connecting the centers of the two blade tip arcs on the two surface contours as the axis of symmetry.

[0009] The indexing accuracy of the blade under test is obtained based on the difference between the symmetries of the two surfaces.

[0010] In one possible implementation, determining the symmetry of the surface using the line connecting the centers of the two blade tip arcs on the surface profile as the axis of symmetry includes:

[0011] The central axis is obtained by connecting the center of the blade tip arc at one end and the center of the blade tip arc at the other end of the surface contour.

[0012] Select at least one first symmetrical line segment, wherein the first symmetrical line segment is perpendicular to the axis and has a first intersection point and a second intersection point with the surface contour;

[0013] The first difference between the first perpendicular distance from the first intersection point to the central axis and the second perpendicular distance from the second intersection point to the central axis is determined as the degree of symmetry.

[0014] Through the above process, the symmetry of the left and right sides of the blade is efficiently quantified into a comparison of the lengths of straight line segments based on the axis of symmetry. This conveniently and accurately characterizes the magnitude of the torsional deformation of the blade, thereby characterizing the relative magnitude of the indexing accuracy.

[0015] In one possible implementation, the method further includes:

[0016] When multiple first symmetrical line segments are selected, the first differences of the multiple first symmetrical line segments are sorted according to their numerical values, and the maximum value is determined as the degree of symmetry.

[0017] In one possible implementation, the method further includes:

[0018] When multiple first symmetrical line segments are selected, the first target symmetrical line segment with the longest length is selected, and the first difference of the first target symmetrical line segment is determined as the degree of symmetry.

[0019] In one possible implementation, the first vertical distance represents the left profile of the upper surface, and the second vertical distance represents the right profile of the upper surface; the method further includes:

[0020] Subtract the second vertical distance from the first vertical distance to obtain the first difference;

[0021] If the first difference is positive, the upper surface profile of the blade under test is larger on the left and smaller on the right; if the first difference is negative, the upper surface profile of the blade under test is larger on the right and smaller on the left.

[0022] Through the above process, the sign of the difference in symmetrical line segments can also indicate the relative size deviation of the left and right sides of the cutting tool, providing more dimensions of data to evaluate the symmetry of the cutting tool, so that the evaluated indexing accuracy can better reflect the stability and precision of the cutting tool in machining.

[0023] In one possible implementation, determining the symmetry of the surface using the line connecting the centers of the two blade tip arcs on the surface profile as the axis of symmetry includes:

[0024] The central axis is obtained by connecting the center of the blade tip arc at one end and the center of the blade tip arc at the other end of the surface contour.

[0025] With the central axis as the axis of symmetry, measure the first interior angle of the triangle to the left of the central axis and the second interior angle of the triangle to the right of the central axis;

[0026] The angle difference between the first interior angle and the second interior angle is defined as the degree of symmetry.

[0027] By quantifying the difference in the interior angle between key feature points on the left and right sides of the blade, the degree of torsional deformation of the blade can be conveniently and accurately characterized, thus providing a scientific basis for evaluating the relative magnitude of the indexing accuracy.

[0028] In one possible implementation, obtaining the surface contours corresponding to the two opposing surfaces of the blade under test includes:

[0029] An optical image measuring instrument is used to project light onto the two surfaces of the blade under test, and the surface contours of the two surfaces are obtained through a photosensitive element; or...

[0030] An image measuring instrument is used to acquire images of the two surfaces of the blade under test, and features are extracted from the acquired surface images to obtain the two surface contours.

[0031] In one possible implementation, the blade to be tested is a quadrilateral blade, each face of which includes at least two oppositely arranged blade tips.

[0032] Secondly, a positioning accuracy measuring fixture is provided, the fixture comprising:

[0033] Base plate;

[0034] The blade clamping assembly, mounted on the base plate, is used to lock the blade under test and perform the indexing of the blade under test;

[0035] The measuring instrument clamping assembly is fixed on the base plate to clamp the measuring instrument and align it with the tip of the blade clamping assembly;

[0036] The measuring instrument is used to measure the symmetry of the tips of the two surfaces of the blade under test before indexing.

[0037] In one possible implementation, the measuring instrument refers to a dial indicator, and the measuring instrument clamping assembly includes: a dial indicator locking hole, a dial indicator positioning hole, a support pad, a pad locking hole, and a pad support base.

[0038] The support pad has a dial indicator positioning hole in the center, and a dial indicator locking hole in the upper part of the support pad.

[0039] The pad support is fixed to the base plate through the pad locking hole.

[0040] In one possible implementation, the blade clamping assembly includes: a quick-locking hole, a transverse blade shank locking hole, a longitudinal blade shank locking hole, a blade shank locking V-block, a blade shank, and a blade to be tested;

[0041] The quick-locking hole is used to fix the tool bar locking V-block to the base plate;

[0042] The tool bar is disposed within the tool bar locking V-block. The extension length of the tool bar can be adjusted through the transverse tool bar locking hole and the longitudinal tool bar locking hole. The end of the tool bar is provided with a tool groove that matches the shape of the blade. The blade to be tested is placed in the tool groove.

[0043] In one possible implementation, the measuring instrument includes a plurality of dial indicators, each dial indicator being fixed by a corresponding dial indicator clamping assembly, and the plurality of dial indicators being respectively arranged in the transverse and longitudinal directions of the blade to be tested.

[0044] In one possible implementation, the measuring instrument includes: a plurality of dial indicators and / or a plurality of angle gauges;

[0045] The dial indicator is used to measure the position difference between the left and right cutting tips on the upper surface to obtain the first degree of symmetry, and is also used to measure the position difference between the left and right cutting tips on the lower surface to obtain the second degree of symmetry.

[0046] The angle gauge is used to measure the angle difference between the left and right blade tips on the upper surface to obtain the first degree of symmetry, and is also used to measure the angle difference between the left and right blade tips on the lower surface to obtain the second degree of symmetry.

[0047] Thirdly, a computing device is provided, comprising a memory and a processor, the memory storing at least one program, the at least one program being executed by the processor to implement the rotation accuracy measurement method as provided in the first aspect.

[0048] Fourthly, a computer-readable storage medium is provided, wherein at least one program is stored therein, the at least one program being executed by a processor to implement the rotation accuracy measurement method as provided in the first aspect.

[0049] Fifthly, a computer program product is provided, including a computer program / instructions that, when executed by a processor, implement the transposition accuracy measurement method provided in the first aspect.

[0050] The technical solution provided in this application includes at least the following technical effects:

[0051] The indicators provided in this application are based on the principle of symmetry measurement. Using the two tool tip arcs as a symmetry reference, the amount of torsional deformation during tool indexing is calculated, thus accurately characterizing the relative magnitude of the tool indexing accuracy. This method is efficient and convenient. The tooling simply uses a measuring instrument to measure the symmetry of the tool before and after indexing; the indexing accuracy can be accurately estimated by taking the difference. Attached Figure Description

[0052] Figure 1 This is a flowchart of a method for measuring the accuracy of indexing provided in an embodiment of this application;

[0053] Figure 2 This is a schematic diagram of a blade provided in an embodiment of this application;

[0054] Figure 3 This is a schematic diagram of a blade tip arc provided in an embodiment of this application;

[0055] Figure 4 This is a schematic diagram of the division of symmetrical line segments provided in an embodiment of this application;

[0056] Figure 5 This is a schematic diagram of the angle difference between the left and right sides of a blade provided in an embodiment of this application;

[0057] Figure 6 This is a schematic diagram of the structure of a tooling for measuring indexing accuracy provided in an embodiment of this application;

[0058] Figure 7 This is a top view of a rotation accuracy measuring fixture provided in an embodiment of this application;

[0059] Figure 8 This is a schematic diagram of the hardware structure of a computing device provided in an embodiment of this application.

[0060] The reference numerals in the figure are respectively:

[0061] 1. Quick-locking hole; 2. Transverse tool bar locking hole; 3. Longitudinal tool bar locking hole; 4. Tool bar locking V-block; 5. Tool bar; 6. Test blade; 7. Base plate; 8. Dial indicator locking hole; 9. Dial indicator positioning hole; 10. Support pad; 11. Pad locking hole; 12. Pad support base.

[0062] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0063] To further illustrate the various embodiments, this application provides accompanying drawings. These drawings are part of the disclosure of this application and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of this application. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components. In this application, the term "at least one" means one or more, and the term "multiple" means two or more.

[0064] This application will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0065] The technical solution provided in this application is for measuring the indexing accuracy of indexable cutting tools.

[0066] This application provides a method for measuring rotation accuracy. Figure 1 This is a flowchart of a method for measuring indexing accuracy provided in an embodiment of this application, as shown below. Figure 1 As shown, the method includes steps S1 to S3.

[0067] S1. Obtain the surface profiles corresponding to the two relatively set surfaces of the blade to be tested.

[0068] In this embodiment, the blade under test has a certain thickness, and both surfaces include at least two oppositely arranged blade tips. In this embodiment, the two surfaces are taken as the upper and lower surfaces. Depending on the blade shape and rotation angle, the two opposite surfaces can also be the left and right surfaces, etc., and this application does not limit this. Specifically, the upper surface corresponds to the first surface profile, and the lower surface corresponds to the second surface profile.

[0069] In this embodiment, both the first and second surface profiles are closed geometric shapes. For example, depending on the shape of the blade, the corresponding surface profile can be: rhombus, parallelogram, hexagon, square, triangle, or rectangle; wherein, the blade tip angle of the rhombus can be an acute angle of different sizes (such as 35°, 55°, 80°, etc.).

[0070] Figure 2 This is a schematic diagram of a blade provided in an embodiment of this application, as shown below. Figure 2 As shown, Figure 2 The upper surface of a VNMG160404 diamond-shaped blade is shown. The tip angle of the diamond-shaped blade is an acute angle of 35°. Tip 1 and tip 2 are two tips facing each other at both ends on the upper surface. Correspondingly, tip 3 and tip 4 are two tips facing each other at both ends on the lower surface.

[0071] The technical solution provided in this application embodiment is for contour acquisition of the upper and lower surfaces of the blade under test. The acquisition method includes at least:

[0072] 1. Optical image measuring instrument

[0073] In some embodiments, an optical image measuring instrument can be used to project light onto the two surfaces of the blade under test to obtain surface profiles. Taking the upper surface and the rotated lower surface of the blade under test as examples, the first surface profile and the second surface profile are obtained through a photosensitive element after light projection.

[0074] For example, an optical image measuring instrument can be an OGP measuring instrument. An OGP measuring instrument is a non-contact optical image measuring instrument that works by shining light onto the object being measured and using optical elements such as lenses and mirrors to focus the light onto a photosensitive element. The photosensitive element converts the light into an electrical signal, which is then processed to form a visible image, thereby enabling precise measurement of the object's shape, size, and surface quality.

[0075] 2. Image measuring instrument

[0076] In some embodiments, an image measuring instrument can be used to acquire images of the two surfaces of the blade under test, and feature extraction can be performed on the acquired surface images to obtain two surface contours. Taking the upper surface and the rotated lower surface of the blade under test as examples, feature extraction is performed on the upper surface image and the lower surface image obtained from the image acquisition to obtain a first surface contour and a second surface contour. Specifically, image acquisition is achieved, for example, through a camera, and the feature extraction process includes, for example, image preprocessing, feature point detection, edge detection, etc.

[0077] For example, the image measuring instrument can be a Tianzhun measuring instrument. The Tianzhun measuring instrument is a fully automatic image measuring instrument that uses a high-resolution camera to capture images of the object to be measured and transmits the captured images to a computer in real time. The computer processes the images, extracting feature points, edges, and contours of the object, thereby achieving precise measurement of its size, shape, and position.

[0078] For example, the image measuring instrument can also be a Keyence measuring instrument. A Keyence measuring instrument is an image dimension measuring instrument that captures an image of a target object using a camera and processes and analyzes the image using algorithms to achieve high-precision measurement of the object's dimensions. Keyence measuring instruments employ advanced edge detection algorithms to accurately identify and capture the edge information of the target object, ensuring the accuracy of the measurement results; furthermore, they can measure all surfaces of an object simultaneously, resulting in higher measurement efficiency.

[0079] The various measuring instruments provided above all support high-precision measurement, ensuring the accuracy and reliability of measurement results; they can also adapt to the measurement needs of objects of different sizes and shapes; they also have automation functions, enabling rapid batch measurement, improving production efficiency and quality control; and based on non-contact measurement, they can effectively avoid damage to the measured object and errors caused by contact.

[0080] In some embodiments, different acquisition methods may be selected or combined according to actual data accuracy requirements and scenario characteristics, and this application does not limit this.

[0081] S2. Using the line connecting the centers of the two blade tip arcs on the two surface profiles as the axis of symmetry, determine the symmetry of the two surfaces respectively.

[0082] In this embodiment, the symmetry of the blade surface profile is used to measure the amount of torsional deformation caused by indexing, thereby effectively characterizing the indexing accuracy of the blade.

[0083] Specifically, in the embodiments of this application, the two surfaces referred to are the upper surface and the lower surface. Taking the upper surface as an example, the axis of symmetry of the upper surface of the blade to be tested is first determined, and then the degree of symmetry of the blade to be tested divided into two parts along the axis of symmetry is calculated according to the axis of symmetry.

[0084] In one possible implementation, for the upper surface, the process of determining the axis of symmetry includes: connecting the center of the first cutting edge arc at one end of the first surface profile with the center of the second cutting edge arc at the other end to obtain a first central axis. For the lower surface, the process of determining the axis of symmetry includes: connecting the center of the third cutting edge arc at one end of the second surface profile with the center of the fourth cutting edge arc at the other end to obtain a second central axis.

[0085] The tip radius, also known as the cutting edge radius, is formed by the intersecting main cutting edge and the side cutting edge. During cutting, to improve the strength of the tool tip and reduce the surface roughness of the workpiece, a rounded transition edge is usually designed at the tool tip. This application uses a rhomboid insert as an example, using the line connecting the centers of the tip radii at both ends as the axis of symmetry of the insert. Figure 3 This is a schematic diagram of a blade tip arc provided in an embodiment of this application, as shown below. Figure 3 As shown, the first surface profile of the upper surface of the rhombus-shaped blade is a corresponding rhombus. One acute angle of the rhombus corresponds to the first cutting tip arc, and the other acute angle corresponds to the second cutting tip arc. The dotted line between the center of the first cutting tip arc and the center of the second cutting tip arc represents the first central axis. The second central axis of the lower surface is similar and will not be described in detail here.

[0086] In this embodiment of the application, after introducing how to determine the axis of symmetry (central axis), the following describes how to obtain the symmetry of the upper and lower surfaces based on the axis of symmetry.

[0087] This application provides various metrics for measuring symmetry, including but not limited to:

[0088] 1. Relative changes in the width of the left and right sides of the blade

[0089] In one possible implementation, taking the upper surface as an example, with the first central axis as the axis of symmetry, the upper surface is divided into left and right sides. By calculating the width distance from the left contour edge to the first central axis and the width from the right contour edge to the first central axis, the symmetry of the left and right side blades can be quantified as a comparison of the lengths of straight line segments.

[0090] The specific process includes: selecting at least one first symmetrical line segment, which is perpendicular to the first central axis and has a first intersection point and a second intersection point with the first surface profile; and determining the first difference between the first vertical distance from the first intersection point to the first central axis and the second vertical distance from the second intersection point to the first central axis as the first degree of symmetry.

[0091] Figure 4 This is a schematic diagram of the division of symmetrical line segments provided in an embodiment of this application. The following is in conjunction with... Figure 4 Explain the above process.

[0092] like Figure 4 As shown, O1 is the center of the first cutting edge arc, O2 is the second cutting edge arc, and O1O2 is the first central axis. A, B, C, and D are the four rhomboid sides that constitute the first surface contour. C1 is the first intersection point of the first symmetrical line segment C1D1 and rhomboid side C, and D1 is the second intersection point of the first symmetrical line segment C1D1 and rhomboid side D. C2 is the first intersection point of the first symmetrical line segment C2D2 and rhomboid side C, and D2 is the second intersection point of the first symmetrical line segment C2D2 and rhomboid side D. C3 is the first intersection point of the first symmetrical line segment C3D3 and rhomboid side C, and D3 is the second intersection point of the first symmetrical line segment C3D3 and rhomboid side D. Similarly, A3 is the first intersection point of the first symmetrical line segment A3B3 and rhomboid side A, and B3 is the second intersection point of the first symmetrical line segment A3B3 and rhomboid side B. A2 is the first intersection point of the first symmetrical line segment A2B2 and the rhombus side A, and B2 is the second intersection point of the first symmetrical line segment A2B2 and the rhombus side B. A1 is the first intersection point of the first symmetrical line segment A1B1 and the rhombus side A, and B1 is the second intersection point of the first symmetrical line segment A1B1 and the rhombus side B. The lengths of the selected first symmetrical line segments A1B1, A2B2, A3B3, C1D1, C2D2, and C3D3 are ordered as follows: A3B3 > A2B2 > A1B1, C3D3 > C2D2 > C1D1.

[0093] Taking the first symmetrical line segment A3B3 as an example, the straight-line distance from A3 to the first central axis O1O2 is the first perpendicular distance, and the straight-line distance from B3 to O1O2 is the second perpendicular distance. The difference between the two can be determined as the first degree of symmetry. For example, A3-B3=3.839-3.861=-0.022mm, then the first degree of symmetry is expressed as -0.022mm.

[0094] Similarly, the specific process for determining the second degree of symmetry corresponding to the lower surface includes: selecting at least one second symmetry line segment, which is perpendicular to the second central axis and intersects the second surface contour at a third and a fourth point; and determining the second degree of symmetry as the second difference between the third perpendicular distance from the third intersection point to the second central axis and the fourth perpendicular distance from the fourth intersection point to the second central axis. This process is the same as the process for the upper surface described above, and will not be repeated here.

[0095] Through the above process, the symmetry of the left and right sides of the blade is efficiently quantified into a comparison of the lengths of straight line segments based on the axis of symmetry. This conveniently and accurately characterizes the magnitude of the torsional deformation of the blade, thereby characterizing the relative magnitude of the indexing accuracy.

[0096] In one possible implementation, the first vertical distance represents the left contour of the upper surface, and the second vertical distance represents the right contour of the upper surface. The process of calculating the first difference includes subtracting the second vertical distance from the first vertical distance to obtain the first difference. Specifically, if the first difference is positive, the upper surface contour of the blade under test is wider on the left than on the right, meaning that relative to the first central axis, the left side of the blade under test is wider than the right side; if the first difference is negative, the upper surface contour of the blade under test is wider on the right than on the left, meaning that relative to the first central axis, the right side of the blade under test is wider than the left side. Similarly, for the lower surface, the third vertical distance represents the left contour of the lower surface, and the fourth vertical distance represents the right contour of the lower surface. The process of determining the second difference includes subtracting the fourth vertical distance from the third vertical distance to obtain the second difference; if the second difference is positive, the lower surface contour of the blade under test is wider on the left than on the right; if the second difference is negative, the lower surface contour of the blade under test is wider on the right than on the left.

[0097] Through the above process, the sign of the difference in symmetrical line segments can also indicate the relative size deviation of the left and right sides of the cutting tool, providing more dimensions of data to evaluate the symmetry of the cutting tool, so that the evaluated indexing accuracy can better reflect the stability and precision of the cutting tool in machining.

[0098] In some possible implementations, taking the above surface as an example, when multiple first symmetrical line segments are selected, the measurement accuracy of symmetry can be specifically improved through the process described in step 1 or step 2 below.

[0099] Step 1: When multiple first symmetrical line segments are selected, sort the first differences among the multiple first symmetrical line segments according to their numerical values, and determine the maximum value as the first degree of symmetry. If the first difference may be positive or negative, sort the first difference according to the magnitude of its absolute value.

[0100] For example, the selected first symmetrical line segments include: A1B1, A2B2, A3B3, C1D1, C2D2, and C3D3. The difference with the largest absolute value is selected as the first difference corresponding to A3B3, and this first difference corresponding to A3B3 is selected as the first degree of symmetry.

[0101] Step 2: When multiple first symmetrical line segments are selected, the first target symmetrical line segment with the longest length is selected, and the first difference of the first target symmetrical line segment is determined as the first degree of symmetry.

[0102] For example, if the lengths of the selected first symmetrical line segments A1B1, A2B2, A3B3, C1D1, C2D2, and C3D3 are ordered as follows: A3B3 > A2B2 > A1B1, C3D3 > C2D2 > C1D1, then the longer one between A3B3 and C3D3 can be selected as the first target symmetrical line segment.

[0103] Similarly, taking the following surface as an example, when multiple second symmetrical line segments are selected, the following processing methods are possible: 1. Sort the second differences of multiple second symmetrical line segments according to their numerical values, and determine the maximum value as the second degree of symmetry. 2. Select the second target symmetrical line segment with the longest length, and determine the second difference of the second target symmetrical line segment as the second degree of symmetry. The specific principle is the same as above, and will not be elaborated here.

[0104] By sorting and filtering the selected first symmetrical line segments, the measurement accuracy of symmetry can be improved in a targeted manner, avoiding random errors.

[0105] 2. Relative changes in the inner angles of the left and right sides of the blade

[0106] In one possible implementation, taking the upper surface of the rhomboid blade as an example, with the first central axis as the axis of symmetry, the upper surface is divided into left and right sides. By calculating the angle difference between the corresponding interior angles of the left and right triangles, the symmetry of the left and right blades can be quantified as an angle difference.

[0107] Specifically, with the first central axis as the axis of symmetry, the first interior angle of the triangle to the left of the first central axis and the second interior angle of the triangle to the right of the first central axis are measured; the angle difference between the first interior angle and the second interior angle is determined as the first degree of symmetry.

[0108] The choice of interior angles may differ depending on the blade shape. For a rhomboid blade with an acute apex angle, the two triangles divided by the first central axis will necessarily contain obtuse angles. Therefore, the obtuse angle of the left triangle is measured as the first interior angle, and the obtuse angle of the right triangle as the second interior angle. Calculating the difference in obtuse angles yields the first degree of symmetry. For a square or rectangular blade containing two apex angles, the first central axis is a diagonal. Therefore, two non-apex angles are directly selected for comparison. For a hexagonal blade, the first central axis is one diagonal. Therefore, two symmetrical interior angles along the other diagonal are selected for comparison. Other blade shapes can also be compared using symmetrical interior angles according to the principle of symmetry, which will not be elaborated upon here.

[0109] Similarly, taking the lower surface of the rhomboid blade as an example, with the second central axis as the axis of symmetry, measure the third interior angle of the triangle to the left of the second central axis and the fourth interior angle of the triangle to the right of the second central axis; the angle difference between the third and fourth interior angles is determined as the second degree of symmetry. This will not be elaborated further here.

[0110] Figure 5 This is a schematic diagram illustrating the angle difference between the left and right sides of a blade according to an embodiment of this application, as shown below. Figure 5 As shown, if the blade profile is smaller on the left and larger on the right, then the central axis rotates to the left relative to the actual angle bisector, meaning the distance from the left edge to the central axis is closer; if the blade profile is larger on the left and smaller on the right, then the central axis rotates to the right relative to the actual angle bisector, meaning the distance from the right edge to the central axis is closer.

[0111] The above process, by quantifying the difference in the interior angle between key feature points on the left and right sides of the blade, can conveniently and accurately characterize the degree of torsional deformation of the blade, thus providing a scientific basis for evaluating the relative magnitude of the indexing accuracy.

[0112] 3. Use a dial indicator to measure symmetry.

[0113] In some other possible implementations, it is also supported to use dial gauge measurements to evaluate the symmetry of the blade surface profile.

[0114] The technical solution provided in this application not only improves the accuracy of indexing precision measurement, but also provides strong data support for subsequent process optimization and quality control.

[0115] S3. The indexing accuracy of the blade under test is obtained based on the difference between the symmetries of the two surfaces.

[0116] In this embodiment, the smaller the difference, the higher the transposition accuracy.

[0117] Taking the upper and lower surfaces of the cutting tool under test as an example, the difference between the two symmetry values ​​corresponding to the upper and lower surfaces directly reflects the minute deformations or deviations that may occur in the cutting tool during indexing. The smaller the difference, the better the cutting tool can maintain its original geometric characteristics and positional accuracy during indexing, thus ensuring the stability and consistency of the machining process. A smaller difference means higher indexing accuracy, and the tool system can cut more accurately according to the preset trajectory and parameters during machining, reducing errors and the generation of defective products.

[0118] In this embodiment, the difference between the first degree of symmetry and the second degree of symmetry is obtained by directly subtracting the first degree of symmetry from the second degree of symmetry. It should be noted that both the first degree of symmetry and the second degree of symmetry may be positive or negative, and their sign must be preserved during the subtraction.

[0119] In one possible implementation, in addition to directly subtracting the first symmetry from the second symmetry, the rotation accuracy can also be obtained by analyzing the following method.

[0120] When comparing the first and second degrees of symmetry to evaluate transposition accuracy, besides directly subtracting the difference, several other methods can be used to more comprehensively analyze and compare these two parameters. Here are some optional comparison methods:

[0121] Percentage Difference: Calculates the percentage difference between two symmetry values. This method visually shows the degree of change of one value relative to another. The formula for calculating the percentage difference is: [(Second blade symmetry - First blade symmetry) / 2 / First perpendicular distance] | × 100%. This method helps to make fair comparisons between symmetry values ​​of different orders of magnitude.

[0122] Standard deviation method: For multiple sets of inserts from the same batch, the standard deviation between their symmetry can be calculated. The standard deviation reflects the dispersion of the data distribution; a smaller standard deviation means the data points are more concentrated, indicating better consistency during the indexing process, thus reflecting higher indexing accuracy. Specifically, the standard deviation of the first symmetry of the multiple sets of inserts is calculated and weighted, then the standard deviation of the second symmetry of the multiple sets of inserts is calculated and weighted, and the two weighted results are subtracted. This introduces a consistency factor to improve the characterization of indexing accuracy.

[0123] Trend Analysis: In addition to directly comparing the symmetry values ​​of a single measurement, the changing trend of the symmetry difference across multiple measurements can be observed. By plotting time series graphs or trend lines, it is possible to analyze whether the symmetry of the cutting tool remains stable during indexing, or whether there are regular changes, thereby helping to identify potential process problems or tool wear.

[0124] Furthermore, by comparing the indexing accuracy data of different inserts or tool systems, we can further analyze various factors affecting indexing accuracy, such as insert material, structural design, manufacturing process, and usage conditions. This helps to gain a deeper understanding of the formation mechanism of indexing accuracy and provides strong support for subsequent tool optimization and process improvement.

[0125] The indicators provided in this application are based on the principle of symmetry measurement. They use the two blade tip arcs as symmetry references to calculate the amount of torsional deformation that occurs during blade indexing, thereby accurately characterizing the relative magnitude of blade indexing accuracy. This is both efficient and convenient.

[0126] Furthermore, it provides multiple metrics for measurement, including quantifying the difference in interior angles between key feature points on the left and right sides of the insert, and quantifying the symmetry of the left and right sides of the insert as a comparison of the lengths of straight line segments. It also supports using the positive or negative sign of the difference in symmetrical line segments to indicate the relative magnitude deviation of the insert's left and right sides, allowing the evaluated indexing accuracy to better reflect the stability and precision of the insert in machining.

[0127] This application also provides a tooling for measuring indexing accuracy. Figure 6 This is a schematic diagram of the structure of a rotation accuracy measuring fixture provided in an embodiment of this application. The following is a description of the structure of such a fixture. Figure 6 This application introduces the indexing accuracy measuring fixture provided in its embodiments.

[0128] The tooling provided in this embodiment includes a base plate 7, a tool clamping assembly, a measuring instrument clamping assembly, and a measuring instrument.

[0129] The blade clamping assembly is mounted on the base plate and is used to lock the blade under test and perform the rotation of the blade under test.

[0130] The measuring instrument clamping assembly is fixed on the base plate and is used to clamp the measuring instrument and align it with the tip of the blade clamping assembly.

[0131] The measuring instrument is used to measure the first symmetry of the blade tip on the upper surface of the blade under test before indexing, and to measure the second symmetry of the lower surface of the blade under test after indexing. The difference between the first symmetry and the second symmetry represents the indexing accuracy of the blade under test.

[0132] In one possible implementation, the measuring instrument refers to a dial indicator, and the measuring instrument clamping assembly includes: a dial indicator locking hole 8, a dial indicator positioning hole 9, a support pad 10, a pad locking hole 11, and a pad support base 12.

[0133] The support pad 10 has a dial indicator positioning hole 9 horizontally opened in the center, and a dial indicator locking hole 8 is opened longitudinally at the upper end of the support pad 10.

[0134] The pad support 12 is fixed to the base plate 7 through the pad locking hole 11.

[0135] In one possible implementation, the blade clamping assembly includes: a quick-locking hole 1, a transverse blade locking hole 2, a longitudinal blade locking hole 3, a blade locking V-block 4, a blade 5, and a blade to be tested 6; the quick-locking hole 1 is used to fix the blade locking V-block 4 to the base plate 7; the blade 5 is disposed in the blade locking V-block 4, and the extension length of the blade 5 can be adjusted by the transverse blade locking hole 2 and the longitudinal blade locking hole 3; the end of the blade 5 is provided with a blade groove that matches the shape of the blade; the blade to be tested 6 is placed in the blade groove.

[0136] Figure 7 This is a top view of a rotation accuracy measuring fixture provided in an embodiment of this application.

[0137] In one possible implementation, the measuring instrument includes multiple dial indicators, each fixed by a corresponding dial indicator clamping assembly. The multiple dial indicators are respectively positioned in the transverse and longitudinal directions of the blade to be measured, and are used to measure longitudinal and transverse distance changes, respectively.

[0138] In one possible implementation, the measuring instrument includes: a dial indicator and / or a bevel gauge;

[0139] Specifically, the dial indicator is used to measure the position difference between the left and right blade tips on the upper surface to obtain the first degree of symmetry, and is also used to measure the position difference between the left and right blade tips on the lower surface to obtain the second degree of symmetry. The position difference between the left and right blade tips can be obtained by measuring the distance from the left edge of the blade to the central axis and the distance from the right edge of the blade to the central axis, and the measurement is performed using a dial indicator.

[0140] Specifically, the angle gauge is used to measure the angle difference between the left and right blade tips on the upper surface to obtain the first degree of symmetry, and also to measure the angle difference between the left and right blade tips on the lower surface to obtain the second degree of symmetry. The angle difference between the left and right blade tips can be obtained by measuring the difference between the inner angles of the left and right sides of the blade, as described in the method embodiment. Alternatively, it can be obtained by measuring the angle between the bisector of the blade tip apex and the central axis. The measurement process can be performed using an electronic angle gauge, which can be directly clamped into the measuring instrument locking hole of the measuring instrument clamping assembly.

[0141] The tooling design provided in this application is accurate and easy to use. Based on the principle of symmetry measurement, it measures the amount of torsional deformation that occurs during the indexing of the cutting tool with the axis of symmetry as the reference. This allows for precise characterization of the relative magnitude of the cutting tool indexing accuracy. It can be used for experimental measurement improvement as well as for measurement of products in production orders.

[0142] This application also provides a computing device for performing the above-described rotation accuracy measurement method. Figure 8 This is a schematic diagram of the hardware structure of a computing device provided in an embodiment of this application, such as... Figure 8 As shown, the computing device includes a processor 801, a memory 802, a bus 803, and a computer program stored in the memory 802 and executable on the processor 801. The processor 801 includes one or more processing cores. The memory 802 is connected to the processor 801 via the bus 803 and is used to store program instructions. When the processor executes the computer program, it implements all or part of the steps in the above-described method embodiments provided in this application.

[0143] Furthermore, as an executable solution, the aforementioned computing device can be a computer unit, which may be a desktop computer, laptop, handheld computer, or cloud server, etc. The computer unit may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the above-described computer unit structure is merely an example and does not constitute a limitation on the computer unit. It may include more or fewer components, or combine certain components, or different components. For example, the computer unit may also include input / output devices, network access devices, buses, etc., which are not limited in this application embodiment.

[0144] Furthermore, as an executable solution, the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The processor is the control center of the computer unit, connecting various parts of the entire computer unit via various interfaces and lines.

[0145] The memory can be used to store the computer programs and / or modules. The processor implements various functions of the computer unit by running or executing the computer programs and / or modules stored in the memory and by calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0146] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements all or part of the steps of the above-described transposition accuracy measurement method of the embodiments of this application.

[0147] This application also provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement all or part of the steps of the above-described transposition accuracy measurement method in the embodiments of this application.

[0148] If the modules / units integrated by the aforementioned computing units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction.

[0149] Although this application has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to this application without departing from the spirit and scope of this application as defined by the appended claims, and all such changes shall be within the scope of protection of this application.

Claims

1. A method for measuring indexing accuracy, characterized in that, The method includes: Obtain the surface profiles corresponding to the two relatively set surfaces of the blade under test; The symmetry of the two surfaces is determined by taking the line connecting the centers of the two blade tip arcs on the two surface contours as the axis of symmetry. The indexing accuracy of the blade under test is obtained based on the difference between the symmetries of the two surfaces. The symmetry of the surface is determined by taking the line connecting the centers of the two blade tip arcs on the surface profile as the axis of symmetry, including: The central axis is obtained by connecting the center of the blade tip arc at one end and the center of the blade tip arc at the other end of the surface contour. Select at least one first symmetrical line segment, wherein the first symmetrical line segment is perpendicular to the axis and has a first intersection point and a second intersection point with the surface contour; The first difference between the first perpendicular distance from the first intersection point to the central axis and the second perpendicular distance from the second intersection point to the central axis is determined as the degree of symmetry. Alternatively, the symmetry of the surface can be determined using the line connecting the centers of the two blade tip arcs on the surface profile as the axis of symmetry, including: The central axis is obtained by connecting the center of the blade tip arc at one end and the center of the blade tip arc at the other end of the surface contour. With the central axis as the axis of symmetry, measure the first interior angle of the triangle to the left of the central axis and the second interior angle of the triangle to the right of the central axis; the first interior angle and the second interior angle are symmetrical interior angles; The angle difference between the first interior angle and the second interior angle is defined as the degree of symmetry.

2. The method for measuring indexing accuracy according to claim 1, characterized in that, The method further includes: When multiple first symmetrical line segments are selected, the first differences of the multiple first symmetrical line segments are sorted according to their numerical values, and the maximum value is determined as the degree of symmetry.

3. The method for measuring indexing accuracy according to claim 1, characterized in that, The method further includes: When multiple first symmetrical line segments are selected, the first target symmetrical line segment with the longest length is selected, and the first difference of the first target symmetrical line segment is determined as the degree of symmetry.

4. The method for measuring indexing accuracy according to any one of claims 1 to 3, characterized in that, The first vertical distance represents the left contour of the upper surface, the second vertical distance represents the right contour of the upper surface, and the method further includes: Subtract the second vertical distance from the first vertical distance to obtain the first difference; If the first difference is positive, the upper surface profile of the blade under test is larger on the left and smaller on the right; if the first difference is negative, the upper surface profile of the blade under test is larger on the right and smaller on the left.

5. The method for measuring indexing accuracy according to claim 1, characterized in that, The step of obtaining the surface contours corresponding to the two relatively positioned surfaces of the blade under test includes: An optical image measuring instrument is used to project light onto the two surfaces of the blade under test, and the surface contours of the two surfaces are obtained through a photosensitive element; or... An image measuring instrument is used to acquire images of the two surfaces of the blade under test, and features are extracted from the acquired surface images to obtain the two surface contours.

Images