Geometric construction method, system and equipment for rear tool face of PCD tool

Abstract

The invention relates to the technical field of PCD tool rear tool face machining, in particular to a PCD tool rear tool face geometric construction method, system and equipment. The method comprises the following steps: acquiring a PCD cutter relief angle, a PCD cutter thickness and a two-dimensional contour line in an XOY plane, and discretizing the PCD cutter two-dimensional contour line to obtain a plurality of contour points of the PCD cutter two-dimensional contour line; selecting a commutation point based on the positive and negative components of the tangent vector of each contour point on the Y axis; based on the axial relief angles of the reversing points, obtaining the axial relief angles of the contour points between the adjacent reversing points through linear interpolation; obtaining a target relief angle guide line of each contour point based on the radial relief angle and the axial relief angle of each contour point; and based on the target relief angle guide line of each contour point and the thickness of the PCD cutter, obtaining a flank guide line cluster of each contour point, and scanning the flank guide line cluster of each contour point in a curve group mode to obtain the flank of the PCD cutter. According to the method, the rear tool face of the PCD tool can be accurately and efficiently constructed.

Description

Technical Field

[0001] The present invention relates to the technical field of PCD tool flank processing, and in particular to a PCD tool flank geometry construction method, system and equipment. Background Art

[0002] Polycrystalline diamond (PCD) tool materials not only have high hardness and good wear resistance, but also have the advantages of isotropy, conductivity, weldability and economy, so they are widely used in the field of processing non-ferrous metals and difficult-to-process non-metallic materials. The back face of PCD tools is generally quite smooth, and PCD materials have high hardness and wear resistance, so the back face of PCD tools plays an important role in ironing the surface of the workpiece. The grinding quality of the back face of PCD tools directly affects the surface quality of the workpiece. The accurate construction of the back face geometry of PCD tools is the prerequisite for ensuring its grinding quality.

[0003] The grinding quality of the flank of a PCD tool has a direct impact on the surface quality of the machined workpiece. The higher the surface quality of the flank, the fewer scratches are left in the tool geometry re-image area on the machined surface, and the higher the quality of the machined surface. At present, the design drawings of PCD tools are mainly based on two-dimensional contour drawings in DXF format. When machining the flank of a PCD tool, it is necessary to construct the flank geometry based on the two-dimensional contour drawings. The commonly used method is to model according to the flank angle parameters in general CAD software, or to perform parametric modeling when generating a machining program through dedicated CAM software.

[0004] However, when modeling the flank face of a PCD tool using CAD software, the application personnel are required to have a high level of modeling skills, and the modeling process is relatively complicated. Parameters such as the back angle are difficult to control, which makes the construction efficiency of the flank face of the PCD tool low. In addition, when some PCD tool manufacturing software generates tool paths, the exported flank face is generally a mesh model. The mesh model is a discrete representation of the approximate surface, which makes the constructed PCD tool flank face low in accuracy, thereby affecting the grinding quality of the PCD tool flank face. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the modeling process of the back face of the PCD tool is relatively complicated and the mesh model has low accuracy, resulting in poor grinding quality of the back face of the PCD tool.

[0006] In order to solve the above technical problems, the present invention provides a method for constructing the geometry of the flank surface of a PCD tool, comprising the following steps:

[0007] Obtain the PCD tool back angle, PCD tool thickness and a two-dimensional contour line in the XOY plane, discretize the PCD tool two-dimensional contour line, and obtain multiple contour points of the PCD tool two-dimensional contour line, wherein the PCD tool back angle includes: an input radial back angle and an input axial back angle;

[0008] Select the reversal point based on the positive and negative components of the tangent vector of each contour point on the Y axis;

[0009] The axial clearance angle between each reversing point and each contour point other than each contour point between adjacent reversing points is set as the input axial clearance angle, and based on the axial clearance angle of each reversing point, the axial clearance angle of each contour point between adjacent reversing points is obtained by linear interpolation;

[0010] Set the radial relief angle of each contour point to the input radial relief angle;

[0011] Based on the radial back angle and the axial back angle of each contour point, a target back angle guide line of each contour point is obtained;

[0012] Based on the target back angle guide line of each contour point and the thickness of the PCD tool, the back tool face guide line cluster of each contour point is obtained, and the back tool face guide line cluster of each contour point is swept by a curve group to obtain the PCD tool back tool face.

[0013] Preferably, the step of obtaining a target back angle guide line for each contour point based on the back angle and the axial back angle of each contour point comprises:

[0014] Based on the radial back angle of each contour point, a radial back angle guide line of each contour point is constructed respectively;

[0015] The radial back angle guide line of each contour point is rotated by the angle of the axial back angle of the contour point, and the rotated radial back angle guide line is used as the target back angle guide line.

[0016] Preferably, the step of obtaining a target back angle guide line for each contour point based on the back angle and the axial back angle of each contour point comprises:

[0017] Based on the axial back angle of each contour point, construct the axial back angle guide line of each contour point respectively;

[0018] The axial back angle guide line of each contour point is rotated by the angle of the radial back angle of the contour point, and the rotated axial back angle guide line is used as the target back angle guide line.

[0019] Preferably, the discretizing the two-dimensional contour line of the PCD tool to obtain a plurality of contour points of the two-dimensional contour line of the PCD tool comprises: discretizing the two-dimensional contour line of the PCD tool by chord height to obtain a plurality of contour points of the two-dimensional contour line of the PCD tool.

[0020] Preferably, the selecting of the reversal point based on the positive or negative component of the tangent vector of each contour point on the Y-axis comprises: selecting a contour point where the component of the tangent vector on the Y-axis changes from positive to negative or from negative to positive as the reversal point.

[0021] Preferably, the axial back angle of each reversing point is calculated by linear interpolation to obtain the axial back angle of each contour point between adjacent reversing points, and the calculation formula is:

[0022]

[0023] Among them, A i A represents the axial back angle of the i-th contour point, m is the m-th contour point of the two-dimensional contour line of the PCD tool, n is the n-th contour point of the two-dimensional contour line of the PCD tool, and the m-th contour point and the n-th contour point are adjacent reversal points; m represents the axial back angle of the mth contour point, A n Indicates the axial back angle of the nth contour point, X i Indicates the X-axis abscissa of the i-th contour point, X m Indicates the X-axis abscissa of the mth contour point, X n Indicates the X-axis horizontal coordinate of the nth contour point.

[0024] Preferably, the two-dimensional outline of the PCD tool is in dxf format.

[0025] Preferably, the step of obtaining a flank face guide line cluster of each contour point based on the target flank angle guide line of each contour point and the PCD tool thickness comprises:

[0026] Based on the PCD tool thickness, the length of the target back angle guide line for each contour point is calculated;

[0027] Based on the target clearance angle guide line of each contour point and the length of the target clearance angle guide line, a clearance face guide line cluster of each contour point is obtained.

[0028] The present invention also provides a PCD tool flank geometry construction system, comprising:

[0029] A discrete module is used to obtain the PCD tool back angle, PCD tool thickness and a two-dimensional contour line in the XOY plane, discretize the two-dimensional contour line of the PCD tool, and obtain multiple contour points of the two-dimensional contour line of the PCD tool, wherein the PCD tool back angle includes: an input radial back angle and an input axial back angle;

[0030] A reversal point selection module is used to select a reversal point based on the positive and negative components of the tangent vector of each contour point on the Y axis;

[0031] An axial backlash angle acquisition module is used to set the axial backlash angle between each commutation point and each contour point other than each contour point between adjacent commutation points as an input axial backlash angle, and obtain the axial backlash angle of each contour point between adjacent commutation points by linear interpolation based on the axial backlash angle of each commutation point;

[0032] A radial back angle acquisition module, used for setting the radial back angle of each contour point to the input radial back angle;

[0033] A target back angle guide line acquisition module is used to acquire a target back angle guide line of each contour point based on the radial back angle and the axial back angle of each contour point;

[0034] A construction module is used to obtain a flank guide line cluster of each contour point based on a target flank angle guide line of each contour point and a PCD tool thickness, and to sweep the flank guide line cluster of each contour point through a curve group to obtain a PCD tool flank face.

[0035] The present invention also provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for constructing the geometry of the flank face of a PCD tool when executing the computer program.

[0036] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0037] The present invention discloses a method, system and device for constructing the geometry of the back tool face of a PCD tool. The present invention discretizes the two-dimensional contour line of the PCD tool to obtain multiple contour points of the two-dimensional contour line of the PCD tool, selects a reversal point based on the positive and negative component of the tangent vector of each contour point on the Y-axis; sets the axial back angle between each reversal point and each contour point except each contour point between adjacent reversal points as the input axial back angle, and obtains the axial back angle of each contour point between adjacent reversal points by linear interpolation based on the axial back angle of each reversal point; sets the radial back angle of each contour point as the input radial back angle, and obtains the target back angle guide line of each contour point based on the radial back angle and the axial back angle of each contour point; obtains the back tool face guide line cluster of each contour point based on the target back angle guide line of each contour point and the thickness of the PCD tool, and sweeps the back tool face guide line cluster of each contour point in the form of a curve group to obtain the PCD tool back tool face. According to the definition principle of the back angle of the PCD milling cutter blade, the present invention obtains the radial back angle and the axial back angle of each contour point on the two-dimensional contour line of the PCD tool, generates the target back angle guide line of each point on the contour line, and determines the length of the target back angle guide line according to the tool thickness. The back tool face curved surface can be quickly swept out by using the target back angle guide lines of all contour points. The PCD tool back tool face constructed by the present invention is different from the gridded surface of other software. It is a true curved surface with higher precision that can be used as the input of the subsequent tool path generation, and reduces the need for step-by-step modeling of complex geometric shapes. The modeling can be completed only by inputting the two-dimensional contour line of the PCD tool, the back angle angle and the thickness of the PCD tool, which greatly simplifies the modeling process and can construct the PCD tool back tool face more efficiently and accurately, thereby improving the grinding quality of the PCD tool back tool face. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 It is a flow chart of a method, system and device for constructing the geometry of the flank face of a PCD tool according to the present invention.

[0040] Figure 2 It is a schematic diagram of the PCD two-dimensional contour line.

[0041] Figure 3 It is a schematic diagram of the rotating body of the PCD tool blade.

[0042] Figure 4 It is a discrete schematic diagram of the contour line.

[0043] Figure 5 This is a schematic diagram of radial back angle calculation.

[0044] Figure 6 This is a schematic diagram of the axial back angle calculation.

[0045] Figure 7 It is a schematic diagram of the target back angle guide line.

[0046] Figure 8 It is a schematic diagram of the flank guide line cluster.

[0047] Fig. 9 It is a schematic diagram of the back tool face geometry.

[0048] Fig.10 It is a schematic diagram of the back blade surface.

[0049] Fig.11 It is a schematic diagram of the corresponding relationship of linear interpolation.

[0050] Fig.12 It is a flow chart of the steps of a method for constructing the geometry of the flank face of a PCD tool according to the present invention.

[0051] Fig.13 It is a structural diagram of a PCD tool flank geometry construction system of the present invention. DETAILED DESCRIPTION

[0052] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0053] Reference Figure 1 , 12 As shown, the first embodiment of the present invention provides a method for constructing the geometry of the flank surface of a PCD tool, comprising the following steps:

[0054] Step S1: obtaining the PCD tool back angle, PCD tool thickness and a two-dimensional contour line in the XOY plane, discretizing the PCD tool two-dimensional contour line to obtain a plurality of contour points of the PCD tool two-dimensional contour line, wherein the PCD tool back angle includes: an input radial back angle and an input axial back angle;

[0055] like Figure 2 As shown, Figure 2 It is a schematic diagram of the PCD two-dimensional contour line. It is agreed that the input contour line is in the XOY plane. For the blade of the PCD tool, in its actual use process, it needs to rotate around the tool rotation axis to obtain the blade rotation body, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the rotating body of the PCD tool blade. The rotating axis is the X-axis and the rotation direction is counterclockwise.

[0056] In this embodiment, preferably, the two-dimensional contour line of the PCD tool is in dxf format.

[0057] In this embodiment, preferably, the discretization of the two-dimensional contour line of the PCD tool to obtain multiple contour points of the two-dimensional contour line of the PCD tool includes: the two-dimensional contour line of the PCD tool is discretized by chord height to obtain multiple contour points of the two-dimensional contour line of the PCD tool. Figure 4 As shown, Figure 4 This is a schematic diagram of contour line discretization. In order to ensure accuracy and minimize the number of points, this patent uses chord height discretization. The contour line is discretized by chord height to obtain contour points, simplifying the continuous curve into a discrete point set.

[0058] Specifically, the two-dimensional contour line of the PCD tool is discretized by the chord height to obtain multiple contour points of the two-dimensional contour line of the PCD tool. First, the chord height value is selected. This value determines the accuracy of the contour discretization. On the two-dimensional contour line, it is divided at equal intervals according to the chord height value to generate multiple chord segments. On each chord segment, its intersection with the tool contour line is determined, and these intersections are contour points.

[0059] Step S2: Select a reversal point based on the positive or negative component of the tangent vector of each contour point on the Y axis;

[0060] In this embodiment, preferably, the selecting of the reversal point based on the positive or negative component of the tangent vector of each contour point on the Y-axis includes: selecting a contour point where the component of the tangent vector on the Y-axis changes from positive to negative or from negative to positive as the reversal point.

[0061] Step S3: setting the axial clearance angle between each reversing point and each contour point other than each contour point between adjacent reversing points as the input axial clearance angle, and obtaining the axial clearance angle of each contour point between adjacent reversing points by linear interpolation based on the axial clearance angle of each reversing point;

[0062] like Figure 6 As shown, Figure 6 The figure is a schematic diagram for calculating the axial clearance angle. The direction of the linear velocity V at any contour point is parallel to the Z axis. Referring to the design manual of PCD tools, from a geometric perspective, the axial clearance angle can be described as the angle between the guide line direction of the tool back face rotating around the Y axis and the reverse vector of the linear velocity direction, that is, Figure 6 The input axial back angle AxialAng is shown as A°. The axial back angle of the P1 contour point is equal to the input axial back angle. The positive or negative of the axial back angle depends on the direction of the tangent vector at the contour point, such as Figure 6 The Y value component of the tangent vector at point P2 in is less than 0, and the rotation angle is positive, such as Figure 6 The Y component of the tangent vector at point P9 in the figure is greater than 0, and the rotation angle is negative. Unlike the radial back angle, the axial back angle at each point on the contour line may be different.

[0063] The step of setting the axial clearance angle between each reversing point and contour points other than contour points between adjacent reversing points as the input axial clearance angle includes: the axial clearance angle between each reversing point and contour points other than each reversing point and contour points between adjacent reversing points are equal to the input axial clearance angle, so the axial clearance angle between each reversing point and contour points other than each reversing point and contour points between adjacent reversing points can be directly obtained based on the input axial clearance angle.

[0064] In this embodiment, preferably, the axial back angle of each reversing point is obtained by linear interpolation based on the axial back angle of each reversing point, and the calculation formula is:

[0065]

[0066] Among them, A i A represents the axial back angle of the i-th contour point, m is the m-th contour point of the two-dimensional contour line of the PCD tool, n is the n-th contour point of the two-dimensional contour line of the PCD tool, and the m-th contour point and the n-th contour point are adjacent reversal points; m represents the axial back angle of the mth contour point, A n Indicates the axial back angle of the nth contour point, X i Indicates the X-axis abscissa of the i-th contour point, X m Indicates the X-axis abscissa of the mth contour point, X n Indicates the X-axis horizontal coordinate of the nth contour point.

[0067] In this embodiment, by Figure 6 The axial clearance angles of the contour points P3 to P8 are obtained by linear interpolation based on the axial clearance angles of the reversal points P2 and P9, as shown in Fig.11 As shown, Fig.11 It is a schematic diagram of the linear interpolation correspondence relationship, and the calculation formula is:

[0068]

[0069] Among them, A i represents the axial back angle of the i-th contour point, A 2 Indicates the axial back angle of the reversing point P2, A 9 Indicates the axial back angle of the reversing point P9, X i Indicates the horizontal coordinate of the i-th contour point on the X axis, X 2 Indicates the X-axis abscissa of the reversing point P2, X 9 Indicates the X-axis abscissa of the reversing point P9.

[0070] Step S4: setting the radial clearance angle of each contour point to the input radial clearance angle;

[0071] like Figure 5 As shown, Figure 5 Figure 2 is a schematic diagram for calculating the radial clearance angle. Since the tool rotates counterclockwise around the X-axis, the direction of the linear velocity V at a point P1 on the contour line is parallel to the Z-axis. Referring to the design manual of the PCD tool, from a geometric perspective, the radial clearance angle can be described as the reverse vector of the guide line direction of the tool back face relative to the cutting linear velocity direction around the tool rotation axis ( Figure 5 The angle between the X-axis and Figure 5 The input radial back angle RadialAng = R° is shown. According to this calculation method, we can get Figure 5 The radial back angle guide line of the P1 contour point in the left view is equal to the radial back angle of the remaining points on the contour line. Therefore, the radial back angle of each contour point is equal to the input radial back angle.

[0072] Step S5: based on the radial back angle and the axial back angle of each contour point, obtaining a target back angle guide line of each contour point;

[0073] like Figure 7 As shown, Figure 7 Schematic diagram of target back angle guide line. In this embodiment, preferably, the step of obtaining the target back angle guide line of each contour point based on the back angle and the axial back angle of each contour point includes:

[0074] Based on the radial back angle of each contour point, a radial back angle guide line of each contour point is constructed respectively;

[0075] The radial back angle guide line of each contour point is rotated by the angle of the axial back angle of the contour point, and the rotated radial back angle guide line is used as the target back angle guide line.

[0076] In this embodiment, preferably, the step of obtaining a target back angle guide line for each contour point based on the back angle and the axial back angle of each contour point includes:

[0077] Based on the axial angle of each contour point, an axial angle guide line of each contour point is constructed respectively;

[0078] The axial angle guide line of each contour point is rotated by the angle of the radial back angle of the contour point, and the rotated axial angle guide line is used as the target back angle guide line.

[0079] Step S6: Based on the target back angle guide line of each contour point and the PCD tool thickness, a back tool face guide line cluster of each contour point is obtained, and the back tool face guide line cluster of each contour point is swept by a curve group to obtain the PCD tool back tool face.

[0080] In this embodiment, preferably, the obtaining of the flank guide line cluster of each contour point based on the target flank angle guide line of each contour point and the PCD tool thickness includes:

[0081] Based on the PCD tool thickness, the length of the target back angle guide line for each contour point is calculated;

[0082] Based on the target clearance angle guide line of each contour point and the length of the target clearance angle guide line, a clearance face guide line cluster of each contour point is obtained.

[0083] like Figure 8 As shown, Figure 8 The figure is a schematic diagram of the flank guide line cluster. According to the target flank guide line of each contour point, the length of each flank guide line is calculated according to the input PCD thickness W value. Referring to the design manual of the PCD tool, from a geometric level, the PCD thickness W can be understood as the projection length of the flank guide line in the Z direction, so that the width of the flank relative to the XOY plane can be guaranteed to be consistent. Based on the above rules, the lengths of all flank guide lines can be calculated to obtain the flank guide line cluster of each contour point.

[0084] like Fig. 9 As shown, Fig. 9 The flank surface is obtained by sweeping through a group of curves. For a contour line composed of multiple non-tangent continuous curves, multiple groups of flank surfaces connected by common edges are obtained.

[0085] like Fig.10 As shown, Fig.10 It is a schematic diagram of the back tool face. The present invention proposes a method for constructing the geometry of the back tool face of a PCD tool, which quickly generates the geometry of the back tool face of a PCD tool based on the input of a two-dimensional contour line, a back angle and a PCD thickness in a dxf format. In this method, the present invention generates a target back angle guide line for each contour point on the two-dimensional contour line according to the back angle definition principle of the PCD milling cutter blade, and determines the length of the target back angle guide line according to the thickness of the PCD tool. The target back angle guide lines of all contour points can be used to quickly sweep out the back tool face curved surface. By combining the geometric construction technology of the present invention with the secondary development technology of general CAD software and realizing it in software through computer technology, efficient and accurate PCD tool back tool face construction can be completed, which brings great convenience to industry applications.

[0086] refer to Fig.13 Embodiment 2 of the present invention provides a PCD tool flank geometry construction system, comprising:

[0087] The discrete module 10 is used to obtain the PCD tool back angle, PCD tool thickness and two-dimensional contour line in the XOY plane, discretize the two-dimensional contour line of the PCD tool, and obtain multiple contour points of the two-dimensional contour line of the PCD tool, wherein the PCD tool back angle includes: an input radial back angle and an input axial back angle;

[0088] A reversing point selection module 20, for selecting a reversing point based on the positive and negative components of the tangent vector of each contour point on the Y axis;

[0089] An axial backlash angle acquisition module 30 is used to set the axial backlash angle between each reversing point and each contour point other than each contour point between adjacent reversing points as an input axial backlash angle, and obtain the axial backlash angle of each contour point between adjacent reversing points by linear interpolation based on the axial backlash angle of each reversing point;

[0090] A radial back angle acquisition module 40, used to set the radial back angle of each contour point to the input radial back angle;

[0091] A target back angle guide line acquisition module 50 is used to acquire a target back angle guide line of each contour point based on the radial back angle and the axial back angle of each contour point;

[0092] The construction module 60 is used to obtain the flank guide line cluster of each contour point based on the target flank angle guide line of each contour point and the PCD tool thickness, and to sweep the flank guide line cluster of each contour point through a curve group to obtain the PCD tool flank.

[0093] Embodiment 3 of the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for constructing the geometry of the back face of a PCD tool when executing the computer program.

[0094] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0095] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0096] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0098] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for constructing the geometry of the flank surface of a PCD tool, characterized in that: The following steps are involved: Obtain the PCD tool back angle, PCD tool thickness and a two-dimensional contour line in the XOY plane, discretize the PCD tool two-dimensional contour line, and obtain multiple contour points of the PCD tool two-dimensional contour line, wherein the PCD tool back angle includes: an input radial back angle and an input axial back angle; Select the reversal point based on the positive and negative components of the tangent vector of each contour point on the Y axis; The axial clearance angle between each reversing point and each contour point other than each contour point between adjacent reversing points is set as the input axial clearance angle, and based on the axial clearance angle of each reversing point, the axial clearance angle of each contour point between adjacent reversing points is obtained by linear interpolation; Set the radial relief angle of each contour point to the input radial relief angle; Based on the radial back angle and the axial back angle of each contour point, a target back angle guide line of each contour point is obtained; Based on the target back angle guide line of each contour point and the thickness of the PCD tool, the back tool face guide line cluster of each contour point is obtained, and the back tool face guide line cluster of each contour point is swept by a curve group to obtain the PCD tool back tool face.

2. A method for constructing the geometry of the flank surface of a PCD tool according to claim 1, characterized in that: The step of obtaining a target back angle guide line for each contour point based on the back angle and the axial back angle of each contour point includes: Based on the radial back angle of each contour point, a radial back angle guide line of each contour point is constructed respectively; The radial back angle guide line of each contour point is rotated by the angle of the axial back angle of the contour point, and the rotated radial back angle guide line is used as the target back angle guide line.

3. A method for constructing the geometry of the flank surface of a PCD tool according to claim 1, characterized in that: The step of obtaining a target back angle guide line for each contour point based on the back angle and the axial back angle of each contour point includes: Based on the axial back angle of each contour point, construct the axial back angle guide line of each contour point respectively; The axial back angle guide line of each contour point is rotated by the angle of the radial back angle of the contour point, and the rotated axial back angle guide line is used as the target back angle guide line.

4. A method for constructing the geometry of the flank surface of a PCD tool according to claim 1, characterized in that: The method of discretizing the two-dimensional contour line of the PCD tool to obtain a plurality of contour points of the two-dimensional contour line of the PCD tool comprises: discretizing the two-dimensional contour line of the PCD tool by chord height to obtain a plurality of contour points of the two-dimensional contour line of the PCD tool.

5. The method for constructing the geometry of the flank surface of a PCD tool according to claim 1, characterized in that: The selecting of the reversal point based on the positive or negative component of the tangent vector of each contour point on the Y axis includes: selecting the contour point where the component of the tangent vector on the Y axis changes from positive to negative or from negative to positive as the reversal point.

6. A method for constructing the geometry of the flank surface of a PCD tool according to claim 1, characterized in that: Based on the axial back angle of each reversing point, the axial back angle of each contour point between adjacent reversing points is obtained by linear interpolation, and the calculation formula is: Among them, A i A represents the axial back angle of the i-th contour point, m is the m-th contour point of the two-dimensional contour line of the PCD tool, n is the n-th contour point of the two-dimensional contour line of the PCD tool, and the m-th contour point and the n-th contour point are adjacent reversal points; m represents the axial back angle of the mth contour point, A n Indicates the axial back angle of the nth contour point, X i Indicates the X-axis abscissa of the i-th contour point, X m Indicates the X-axis abscissa of the mth contour point, X n Indicates the X-axis horizontal coordinate of the nth contour point.

7. A method for constructing the geometry of the flank surface of a PCD tool according to claim 1, characterized in that: The 2D contour of the PCD tool is in dxf format.

8. A method for constructing the geometry of the flank surface of a PCD tool according to claim 1, characterized in that: The method of obtaining a flank face guide line cluster of each contour point based on the target flank angle guide line of each contour point and the PCD tool thickness includes: Based on the PCD tool thickness, the length of the target back angle guide line for each contour point is calculated; Based on the target clearance angle guide line of each contour point and the length of the target clearance angle guide line, a clearance face guide line cluster of each contour point is obtained.

9. A PCD tool back face geometry construction system, characterized in that: include: A discrete module is used to obtain the PCD tool back angle, PCD tool thickness and a two-dimensional contour line in the XOY plane, discretize the two-dimensional contour line of the PCD tool, and obtain multiple contour points of the two-dimensional contour line of the PCD tool, wherein the PCD tool back angle includes: an input radial back angle and an input axial back angle; A reversal point selection module is used to select a reversal point based on the positive and negative components of the tangent vector of each contour point on the Y axis; An axial backlash angle acquisition module is used to set the axial backlash angle between each commutation point and each contour point other than each contour point between adjacent commutation points as an input axial backlash angle, and obtain the axial backlash angle of each contour point between adjacent commutation points by linear interpolation based on the axial backlash angle of each commutation point; A radial back angle acquisition module, used for setting the radial back angle of each contour point to the input radial back angle; A target back angle guide line acquisition module is used to acquire a target back angle guide line of each contour point based on the radial back angle and the axial back angle of each contour point; A construction module is used to obtain a flank guide line cluster of each contour point based on a target flank angle guide line of each contour point and a PCD tool thickness, and to sweep the flank guide line cluster of each contour point through a curve group to obtain a PCD tool flank face.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for constructing the geometry of the flank face of a PCD tool according to any one of claims 1 to 8 are implemented.

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