Design method of drill point slotting sand contour shape and computer readable storage medium

Abstract

The invention discloses a design method of a drill point slotting sand contour shape and a computer readable storage medium, and the design method comprises the following steps: constructing a function of a motion track according to structure parameters of a drill point, generating parameter values of a section contour of a grinding wheel, and constructing a section contour function of the grinding wheel according to the parameter values of the section contour of the grinding wheel, then a tool face function of the drill point, a chip groove section contour function of the chip groove and a function of an intersecting line between the groove face function of the chip groove and the tool face of the drill point are sequentially constructed, whether the intersecting line meets the preset requirement in the direction perpendicular to the first set plane or not is judged, if not, the parameter value of the section contour of the corresponding grinding wheel is adjusted, and the grinding wheel is obtained. And returning to the step of constructing the section contour function of the grinding wheel according to the parameter values of the section contour of the grinding wheel, and finally obtaining the section contour function of the grinding wheel meeting the design requirement. According to the method, the design efficiency of the grinding wheel can be improved, and the consistency of drill points can be controlled.

Description

Technical Field

[0001] The technology relates to the field of grinding wheel design, and in particular to a design method for a drill bit slotted grinding wheel profile and a computer-readable storage medium. Background Art

[0002] As electronic equipment and devices develop towards precision and integration, the requirements for printed circuit board (PCB) drilling processing are becoming increasingly stringent. Among them, the consistency of drilling tools is an important prerequisite for ensuring the consistency of printed circuit board (PCB) drilling processing. The grinding of slotted grinding wheels is an important factor affecting the shape of the drill bit, but the existing grinding of slotted grinding wheels mostly relies on the experience of workers, or adjusts its geometric profile based on the experience of engineers, which is time-consuming and labor-intensive in actual applications and is not conducive to controlling the consistency of the grinding wheel. Summary of the invention

[0003] The present application aims to provide a design method for a drill bit slotted grinding wheel profile and a computer-readable storage medium, which can improve the grinding efficiency of the slotted grinding wheel and facilitate the control of the consistency of the grinding wheel.

[0004] To achieve the above-mentioned purpose, the present application provides a method for designing a drill bit slotted sand profile, comprising:

[0005] S1, constructing a function of the motion trajectory of the grinding wheel relative to the drilling needle when the grinding wheel is grooving according to the structural parameters of the drilling needle and generating various parameter values ​​of the cross-sectional profile of the grinding wheel;

[0006] S3, constructing a cross-sectional profile function of the grinding wheel according to each of the parameter values;

[0007] S5, constructing a chip groove cross-sectional profile function of the chip groove of the drill bit according to the offset angle of the grinding wheel and the cross-sectional profile function of the grinding wheel;

[0008] S7, constructing a groove surface function of the chip groove of the drill bit according to the function of the motion trajectory and the chip groove cross-sectional profile function;

[0009] S9, obtaining a function of the intersection line between the chip groove and the cutting edge of the drill bit according to the groove surface function and the cutting edge function of the drill bit, wherein the cutting edge function is constructed according to the structural parameters of the drill bit;

[0010] S11, determining whether the intersection line meets the preset requirements in the direction perpendicular to the first set plane, if yes, proceeding to the next step, if no, adjusting the corresponding parameter value and returning to step S3, wherein the first set plane is a plane passing through the axis of the drill bit and the center line of the blade face;

[0011] S13, determining whether the latest cross-sectional profile function of the grinding wheel meets the design requirements.

[0012] Optionally, the intersection line includes a main cutting edge and a rear edge, and the main cutting edge and the rear edge are connected;

[0013] The parameters of the cross-sectional profile of the grinding wheel include: a first arc segment, a first center angle, a second arc segment and a second center angle, the first arc segment and the second arc segment are connected, the first center angle is the center angle of the first arc segment, and the second center angle is the center angle of the second arc segment;

[0014] A first preset point, a second preset point and a third preset point are provided on the rear edge; wherein the first preset point is located on a straight line perpendicular to the first setting plane, the straight line intersects the axis of the drill needle perpendicularly, the distance between the second preset point and the first preset point is within a first preset range, the third preset point is closer to the intersection of the main cutting edge and the rear edge than the second preset point or the third preset point is the second preset point, the first arc segment corresponds to the main cutting edge and the portion of the rear edge between the end point intersecting the main cutting edge and the third preset point, and the second arc segment corresponds to the portion of the rear edge between the second preset point and the end point of the rear edge away from the main cutting edge;

[0015] Step S11 includes:

[0016] S111, determining whether the distance from each point of the main cutting edge to the second setting plane is within a second preset range, if so, proceeding to step S112, if not, adjusting the parameter value of the first arc segment and returning to step S3, wherein the second setting plane is parallel to the first setting plane or is the first setting plane;

[0017] S112, determining whether the distances from each point between the intersection of the main cutting edge and the trailing edge and the third preset point to the first set plane are within a third preset range, if so, proceeding to step S113, if not, adjusting the parameter value of the first central angle and returning to step S3;

[0018] S113, determining whether the distance from the second preset point to the first set plane is within a fourth preset range, if so, proceeding to the next step, if not, adjusting the parameter value of the second central angle and returning to step S3;

[0019] The upper limit of the third preset range is smaller than the lower limit of the fourth preset range.

[0020] Optionally, if the determination result in step S11 is yes, before step S13, the method further includes:

[0021] S12, determine whether the distance between the two intersection lines of the groove surface of the chip groove and the outer diameter circumference surface of the drill bit is within the fifth preset range, if so, proceed to the next step, if not, adjust the corresponding parameter value and return to step S3.

[0022] Optionally, the drill needle comprises two symmetrically arranged chip grooves, and the two chip grooves intersect with the tool surface to form two intersection lines;

[0023] The intersection line includes a main cutting edge;

[0024] After step S9 and before step S11, the method further includes:

[0025] S101, determining whether the difference between the shortest distance between the two intersection lines and the preset core thickness value is within a sixth preset range, if so, proceeding to step S102;

[0026] S102, determining whether the coordinate difference between the two end points of the main cutting edge in the axial direction of the drill bit is within a seventh preset range, and if so, proceeding to the next step.

[0027] Optionally, a spatial rectangular coordinate system of the drill needle is established with the center line of the blade surface as the X-axis, the axis of the drill needle as the Z-axis, and the center point of the blade surface as the first origin;

[0028] The function of the motion trajectory is:

[0029]

[0030] Wherein, x, y and z are the coordinates of the point on the motion trajectory, A is the initial phase in the X-axis direction, B is the initial phase in the Y-axis direction, R i is the radius of the spiral line where the point (x, y) is located, is the helix angle of the drill bit.

[0031] Optionally, a plane rectangular coordinate system of the cross-sectional profile of the grinding wheel is established, wherein the plane rectangular coordinate system takes the lowest point of the cross-sectional profile of the grinding wheel as the second origin, and the X' axis of the plane rectangular coordinate system is parallel to the axis of the grinding wheel;

[0032] The corresponding relationship between the coordinates of the points on the cross-sectional profile of the chip removal groove and the coordinates of the points on the cross-sectional profile of the grinding wheel is:

[0033] x′ p =x′ / cosθ offset ,

[0034] y′ p =y′;

[0035] Among them, x′ p and y′ pis the coordinate of a point on the cross-sectional profile of the chip groove, x′ and y′ are the coordinates of a point on the cross-sectional profile of the grinding wheel, θ offset is the offset angle of the grinding wheel.

[0036] Optionally, the conversion relationship between the plane rectangular coordinate system and the space rectangular coordinate system is:

[0037] y=y′ p +y0,

[0038]

[0039] The groove surface function of the chip removal groove is:

[0040]

[0041] Among them, x0, y0 and z0 are the initial values ​​of the groove surface function of the chip groove, and R is the radius of the drill needle.

[0042] Optionally, the drill needle comprises two symmetrically arranged chip grooves, and the two chip grooves intersect with the tool surface to form two intersection lines;

[0043] The intersection line includes a main cutting edge;

[0044] After step S9 and before step S11, the method further includes:

[0045] S101, determining whether the difference between the shortest distance between the two intersection lines and the preset core thickness value is within a sixth preset range, if so, proceeding to step S102, if not, adjusting the y0 value of the groove surface function of the chip removal groove;

[0046] S102, determining whether the coordinate difference between the two end points of the main cutting edge in the axial direction of the drill bit is within a seventh preset range, if so, proceeding to the next step, if not, adjusting the z0 value of the groove surface function of the chip groove.

[0047] Optionally, the parameters of the cross-sectional profile of the grinding wheel include: a first arc segment, a first center angle, a second arc segment, and a second center angle, the first arc segment and the second arc segment are connected, the first center angle is the center angle of the first arc segment, and the second center angle is the center angle of the second arc segment;

[0048] The second origin is a point on the second arc segment, and the Y′ axis of the plane rectangular coordinate system passes through the center of the second arc segment.

[0049] The equation of the first arc segment is:

[0050]

[0051] The equation of the second arc segment is:

[0052]

[0053] Wherein, x′1 and y′1 are the coordinates of the point on the circle where the first arc segment is located in the plane rectangular coordinate system, a1 and b1 are the coordinates of the center of the circle where the first arc segment is located, R1 is the radius of the circle where the first arc segment is located, x′2 and y′2 are the coordinates of the point on the circle where the second arc segment is located in the plane rectangular coordinate system, and R2 is the radius of the circle where the second arc segment is located;

[0054] To achieve the above objectives, the present application also provides a computer-readable storage medium on which a program is stored, and when the program is executed by a processor, the above-mentioned method for designing the drill bit slot sand profile is implemented.

[0055] In the present application, the function of the motion trajectory and the parameter values ​​of the cross-sectional profile of the grinding wheel are constructed according to the structural parameters of the drill bit, and the cross-sectional profile function of the grinding wheel is constructed according to the parameter values ​​of the cross-sectional profile of the grinding wheel, and then the function of the blade surface of the drill bit and the cross-sectional profile function of the chip groove of the drill bit, and the function of the intersection line between the groove surface function of the chip groove of the drill bit and the blade surface of the drill bit are constructed in sequence, and it is judged whether the intersection line meets the preset requirements in the direction perpendicular to the first set plane. If so, it is determined that the latest cross-sectional profile function of the grinding wheel meets the design requirements. If not, the corresponding parameter values ​​of the cross-sectional profile of the grinding wheel are adjusted, and the step of constructing the cross-sectional profile function of the grinding wheel according to the parameter values ​​of the cross-sectional profile of the grinding wheel is returned to, and finally the cross-sectional profile function of the grinding wheel that meets the design requirements is obtained. The above method can improve the design efficiency of the grinding wheel and is conducive to controlling the consistency of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a schematic diagram of the three-dimensional structure of the drill bit according to an embodiment of the present application.

[0057] Figure 2 This is a schematic diagram of the end face structure of the drill bit according to an embodiment of the present application.

[0058] Figure 3 This is a schematic diagram of the grinding wheel grooving the drill bit in an embodiment of the present application.

[0059] Figure 4 for Figure 1 Enlarged view of part A in the middle.

[0060] Figure 5 This is a flow chart of the method for designing the drill bit slot sand profile according to the first embodiment of the present application.

[0061] Figure 6a and Figure 6b This is a schematic diagram of the structure of the drill bit end face corresponding to two different preset requirements of this application.

[0062] Figures 7 to 9 Flow charts of the method for designing drill bit slot sand profiles according to three other embodiments of the present application.

[0063] Fig.10 It is a structural schematic diagram of the cross-sectional profile of the grinding wheel according to the embodiment of the present application.

[0064] Fig.11 A schematic diagram of establishing a plane rectangular coordinate system for the cross-sectional profile of the grinding wheel according to an embodiment of the present application.

[0065] Fig.12 This is a flow chart of a method for designing a drill bit slot sand profile according to another embodiment of the present application.

[0066] Fig.13a and Fig.13b This is a schematic structural diagram of the end surface of the drill needle when the difference between the shortest distance between the two intersection lines of the embodiment of the present application and the preset core thickness value is not within the sixth preset range.

[0067] Fig.14a and Fig.14b This is a schematic structural diagram of the end face of the drill bit when the coordinate difference between the two end points of the main cutting edge in the axial direction of the drill bit is not within the seventh preset range in the embodiment of the present application.

[0068] Fig.15 This is a flow chart of a method for designing a drill bit slot sand profile according to another embodiment of the present application.

[0069] Fig.16a and Fig.16b This is a schematic structural diagram of the end face of the drill bit when the distance from each point of the main cutting edge to the second set plane is not within the second preset range in the embodiment of the present application.

[0070] Fig.17 This is a schematic structural diagram of the end face of the drill needle in which the distances from each point between the intersection of the main cutting edge and the rear edge and the first preset point on the rear edge to the first set plane are not within a third preset range.

[0071] Fig.18 This is a schematic diagram of the cross-sectional profile of the grinding wheel when the distance from the second preset point on the rear edge to the first set plane is not within the fourth preset range in the embodiment of the present application.

[0072] Fig.19a This is a schematic structural diagram of the end face of the drill bit when the distance from the second preset point on the rear edge to the first set plane is within a fourth preset range in the embodiment of the present application.

[0073] Fig.19b and Fig.19cThis is a schematic structural diagram of the end face of the drill needle when the distance from the second preset point on the rear edge to the first set plane is not within a fourth preset range in the embodiment of the present application. DETAILED DESCRIPTION

[0074] In order to explain the technical content, structural features, achieved objectives and effects of the present application in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0075] See also Figure 1 and Figure 2 The drill bit 1 involved in the present application comprises a chip groove 11 and a blade face 12. The chip groove 11 is spirally opened on the side wall of the drill bit 1 along the axial direction of the drill bit 1 from the end of the drill bit 1, and intersects with the blade face 12 arranged at the end of the drill bit 1 to form an intersection line 13.

[0076] Specifically, the tool face 12 has a drill tip 123 (center point) and a center line 115 passing through the drill tip 123. At least one side of the center line 115 forms a flank surface, and the flank surface intersects with the chip flute 11 to form an intersection line 13.

[0077] More specifically, the blade face 12 has two first flank faces 121 and two second flank faces 122 symmetrically about the drill tip 123, each first flank face 121 is connected to one second flank face 122 through a center line 115 (the contours of the two center lines 115 on the drill end face are located on the same straight line passing through the drill tip 123, and the drill end face refers to a plane passing through the drill tip 123 of the drill 1 and perpendicular to the axis of the drill 1.), and is connected to another second flank face 122 through a chisel edge 116, and the two chisel edges 116 intersect at the drill tip 123. The side of the first flank face 121 opposite to the center line 115 intersects with the chip groove 11 to form a main cutting edge 131, and the side of the second flank face 122 opposite to the center line 115 intersects with the chip groove 11 to form a back edge 132, and the main cutting edge 131 intersects with the corresponding back edge 132 at an end of a chisel edge 116 away from the drill tip 123. The intersection line 13 includes a main cutting edge 131 and a rear edge 132 .

[0078] Please refer to 1 to Figure 6b The present application embodiment discloses a method for designing a drill bit slotted sand profile, comprising:

[0079] S1, based on the structural parameters of the drill bit 1, construct a function of the motion trajectory of the grinding wheel 2 relative to the drill bit 1 when grooving and generate various parameter values ​​of the cross-sectional profile of the grinding wheel 2.

[0080] See also Figure 1 and Figure 3 After the grinding wheel 2 grinds the drill 1, a chip groove 11 can be obtained, that is, the function of the motion trajectory of the grinding wheel 2 relative to the drill 1 when grooving corresponds to the chip groove 11.

[0081] The structural parameters of the drill 1 are the geometrical dimensions and shape parameters of the drill 1 during the design or processing of the drill 1, such as the radius of the drill 1 or the angle between each spiral line on the flute surface of the chip flute 11 and the axis of the drill 1, etc. Therefore, the function of the motion trajectory of the grinding wheel 11 relative to the drill 1 when grooving and the initial values ​​of each parameter value of the cross-sectional profile of the grinding wheel 2 can be determined according to the structural parameters.

[0082] S3, constructing a cross-sectional profile function of the grinding wheel 2 according to each parameter value.

[0083] The parameter values ​​of the cross-sectional profile of the grinding wheel 2 include the parameters required to construct the cross-sectional profile of the grinding wheel. For example, for a grinding wheel 2 whose cross-sectional profile includes several connected arc segments, its parameter values ​​may include the radius of each arc segment and the value of the central angle of the circle, etc. After determining the parameter values ​​of the cross-sectional profile of the grinding wheel 2, the cross-sectional profile function of the grinding wheel 2 can be constructed.

[0084] S5, constructing a chip groove cross-sectional profile function of the chip groove 11 of the drill bit 1 according to the offset angle of the grinding wheel 2 and the cross-sectional profile function of the grinding wheel 2.

[0085] See also Figure 3 and Figure 4 When the grinding wheel 2 grooves the drill 1, the normal of the cross section of the grinding wheel 2 perpendicular to the groove surface of the chip groove 11 does not coincide with the normal of the cross section of the chip groove 11, but there is a certain angle, which is called the offset angle θ. offset Setting a certain offset angle helps to reduce the impact of loading and unloading and inhibit the wear of the grinding wheel 2.

[0086] Specifically, because there is a corresponding relationship between the chip groove 11 and the grinding wheel 2 , the chip groove cross-sectional profile function can be obtained by performing coordinate transformation on the cross-sectional profile function of the grinding wheel 2 according to the offset angle of the grinding wheel 2 .

[0087] S7, constructing a groove surface function of the chip groove 11 according to the function of the motion trajectory and the cross-sectional profile function of the chip groove.

[0088] S9, obtaining a function of the intersection line between the chip groove 11 and the cutting surface 12 according to the groove surface function and the tool surface function of the drill bit 1, wherein the tool surface function is constructed according to the structural parameters of the drill bit 1.

[0089] Specifically, the coordinates of multiple feature points on the blade surface 12 can be obtained according to the structural parameters of the drill bit 1, and then the blade surface function can be obtained according to the coordinates of each feature point. For example, in a specific example, the blade surface function can be obtained based on multiple feature points of the first flank surface 121 and the second flank surface 122 on one side of the two center lines 115.

[0090] S11, determine whether the intersection line 13 meets the preset requirements in the direction perpendicular to the first set plane. If so, proceed to the next step. If not, adjust the corresponding parameter value and return to step S3, where the first set plane is a plane passing through the axis of the drill needle 1 and the center line 115 of the blade surface 12.

[0091] The preset requirements corresponding to the intersection line 13 of the cutting surface 12 of different drill bits 1 are also different. For example, the intersection line 13 includes the main cutting edge 131 and the rear edge 132:

[0092] Please combine Figure 2 , Figure 6a and Figure 6b The first back cutting surface 121 intersects with the chip groove 11 on the side opposite to the center line 115 to form a main cutting edge 131, and the second back cutting surface 122 intersects with the chip groove 11 on the side opposite to the center line 115 to form a back edge 132. The main cutting edge 131 intersects with the corresponding back edge 132 at an end of a transverse edge 116 away from the drill tip 123.

[0093] For a conventional PCB drill, the preset requirements may include: on the end face of the drill 1, the main cutting edge 131 is roughly a straight line and parallel to the center line 115; the rear edge 132 is not concave, and the arc shape of the rear edge 132 meets the requirements. Different types of drills 1 have different preset requirements, and the shape of the preset blade 12 may also be different. Figure 6a and 6b There are two different blade faces 12 corresponding to different preset requirements, wherein Figure 6a The drill bit is a chip removal type. Figure 6b For a rigid drill bit, the preset requirements of the main cutting edges 131 of the two are the same, but the preset requirements of the rear edges 132 of the two are different, and the shapes of the cutting surfaces 12 obtained in the end are different.

[0094] Of course, the above examples are only for the convenience of understanding and cannot be understood as limitations of the present application. The structure of the drill bit 1 is not limited to this.

[0095] It can be understood that the next step of S11 is not necessarily S13, and there may be other steps between S11 and S13.

[0096] S13, determining that the cross-sectional profile function of the latest grinding wheel 2 meets the design requirements.

[0097] In the embodiment of the present application, the function of the motion trajectory and the parameter values ​​of the cross-sectional profile of the grinding wheel 2 are constructed according to the structural parameters of the drill 1, and the cross-sectional profile function of the grinding wheel 2 is constructed according to the parameter values ​​of the cross-sectional profile of the grinding wheel 2, and then the tool face function of the drill 1 and the chip groove cross-sectional profile function of the chip groove 11, the groove face function of the chip groove 11 and the function of the intersection line 13 between the tool face 12 are constructed in sequence, and it is judged whether the intersection line 13 meets the preset requirements in the direction perpendicular to the first set plane. If so, it is determined that the latest cross-sectional profile function of the grinding wheel 2 meets the design requirements. If not, the corresponding parameter value of the cross-sectional profile of the grinding wheel 2 is adjusted, and the step of constructing the cross-sectional profile function of the grinding wheel 2 according to the parameter values ​​of the cross-sectional profile of the grinding wheel 2 is returned to finally obtain the cross-sectional profile function of the grinding wheel 2 that meets the design requirements. The above method can improve the design efficiency of the grinding wheel 2 and is conducive to controlling the consistency of the drill 1.

[0098] See also Figure 7 In some embodiments, if the determination result in step S11 is yes, before step S13, step S12 is further included:

[0099] S12, determine whether the distance between the two intersection lines of the groove surface of the chip groove 11 and the outer diameter circumferential surface 14 of the drill bit 1 is within the fifth preset range, if so, proceed to the next step, if not, adjust the corresponding parameter value and return to step S3.

[0100] See also Figure 4 The distance between the groove surface of the chip groove 11 and the outer diameter circumferential surface 14 of the drill needle 1 is the width d1 of the chip groove 11.

[0101] It can be understood that if the judgment result of S12 is yes, the next step is not necessarily S13, and there may be other steps between S12 and S13.

[0102] See also Figure 2 and Figure 8 In some embodiments, the drill bit 1 includes two symmetrically arranged chip grooves 11, the two chip grooves 11 intersect with the cutting surface 12 to form two intersection lines 13, the intersection line 13 includes a main cutting edge 131, and the first back cutting surface 121 intersects with the chip groove 11 on the side opposite to the center line 115 to form the main cutting edge 131.

[0103] After step S9 and before step S11, the method further includes:

[0104] S101, determining whether the difference between the shortest distance between the two intersection lines 13 and the preset core thickness value is within a sixth preset range, if so, proceeding to step S102;

[0105] S102, determining whether the coordinate difference between the two end points of the main cutting edge 131 in the axial direction of the drill bit is within a seventh preset range, and if so, proceeding to the next step.

[0106] See also Fig. 9 Optionally, if the determination result in step S11 is yes, before step S13, step S12 is further included:

[0107] S12, determine whether the distance between the two intersection lines of the groove surface of the chip groove 11 and the outer diameter circumference of the drill needle 1 is within the fifth preset range, if so, proceed to the next step, if not, adjust the corresponding parameter value and return to step S3.

[0108] It can be understood that if the judgment result of S102 is yes, entering the next step is not necessarily S11, and there may be other steps between S102 and S11. If the judgment result of S12 is yes, entering the next step is not necessarily S13, and there may be other steps between S12 and S13.

[0109] The following is a detailed description of the drill bit 1 and its corresponding grinding wheel 2:

[0110] See also Figure 1 and Figure 2 For drills 1 of different shapes, the structural parameters of the blade 12 will also be different. In a specific example, the blade 12 has a drill tip 123 (center point) and two first flanks 121 and two second flanks 122 symmetrical about the drill tip 123, each first flank 121 is connected to a second flank 122 via a center line 115 (the contours of the two center lines 115 on the end face of the drill are located on the same straight line passing through the drill tip 123, and the end face of the drill refers to a plane passing through the drill tip 123 of the drill 1 and perpendicular to the axis of the drill 1.), and is connected to another second flank 122 via a chisel edge 116, and the two chisel edges 116 intersect at the drill tip 123. The intersection line 13 includes a main cutting edge 131 and a rear edge 132. Each first rear face 121 intersects with the chip groove 11 on the side opposite to the center line 115 to form a main cutting edge 131. Each second rear face 122 intersects with the chip groove 11 on the side opposite to the center line 115 to form a rear edge 132. Each main cutting edge 131 intersects with the corresponding rear edge 132 at an end point of a transverse edge 116 away from the drill tip 123.

[0111] In some embodiments, the structural parameters of the drill needle 1 include the radius R of the drill needle 1, the core thickness w, the helix angle Land angle γ.

[0112] The core thickness w is the distance between the projections of the two main cutting edges 131 on the end face of the drill bit (when the main cutting edges 131 are non-straight lines, it refers to the minimum distance between the main cutting edges 131), and the helix angle It is the angle between each spiral line on the groove surface of the chip groove 11 and the axial direction of the drill bit 1, and the land angle y is the angle between the line connecting the end point of the rear edge 132 away from the main cutting edge 131 and the drill tip 123 and the projection of the center line 115 on the end surface of the drill bit.

[0113] With the center line 115 as the X-axis, the axis of the drill needle 1 as the Z-axis, the drill tip 123 as the first origin O, and a straight line perpendicular to the X-axis and the Z-axis through the first origin O as the Y-axis, a spatial rectangular coordinate system of the drill needle 1 is established.

[0114] Then the function of the motion trajectory of the grinding wheel 2 relative to the drill 1 when grooving is:

[0115]

[0116] Among them, x, y and z are the coordinates of the points on the motion trajectory, R l is the radius of the spiral line where the point (x, y) is located. A is the initial phase in the X-axis direction, and B is the initial phase in the Y-axis direction, which is related to the cutting angle, profile and swing angle of the grinding wheel 2. For example, for the end point of the rear edge 132 of the grinding wheel 2 that does not intersect with the main cutting edge 131, the value of A in the corresponding motion trajectory function is cos -1 γ, the value of B is sin -1 γ.

[0117] Specifically,

[0118]

[0119] At the same time, a plane rectangular coordinate system of the cross-sectional profile of the grinding wheel 2 is established, the plane rectangular coordinate system takes the lowest point of the cross-sectional profile of the grinding wheel 2 as the second origin O', and the X' axis of the plane rectangular coordinate system is parallel to the axis of the grinding wheel 2. The lowest point of the cross-sectional profile of the grinding wheel 2 is the point farthest from the axis of the grinding wheel 2.

[0120] The coordinates of the points on the cross-sectional profile of the chip removal groove and the coordinates of the points on the cross-sectional profile of the grinding wheel 2 correspond to each other as follows:

[0121] x′ p =x′ / cosθ offset ,①

[0122] y′ p =y′,②

[0123] Among them, x′ p and y′ p is the coordinate of a point on the cross-sectional profile of the chip groove, x′ and y′ are the coordinates of a point on the cross-sectional profile of the grinding wheel 2, θ offset is the offset angle of grinding wheel 2.

[0124] The conversion relationship between the plane rectangular coordinate system O'X'Y' and the space rectangular coordinate system OXYZ is:

[0125] y=y′ p +y0, ③

[0126]

[0127] The groove surface function of the chip groove 11 is:

[0128]

[0129] Among them, x0, y0 and z0 are the initial values ​​of the groove surface function.

[0130] For the above-mentioned drill needle 1, you can use Fig.10 The grinding wheel 2 is grooved. The grinding wheel 2 is formed by connecting a first straight segment, a first arc segment, a second arc segment and a second straight segment in sequence. The center position O1, radius R1 and first center angle ω1 of the first arc segment, as well as the center position O2, radius R2 and second center angle ω2 of the second arc segment can generate corresponding initial values ​​according to the structural parameters of the drill bit 1, and are adjusted based on the initial values. In order to reduce the grinding amount of the grinding wheel 2 and reduce production costs, the opening angles of the first straight segment and the second straight segment are usually set to fixed values, that is, the angle θ1 of the first opening angle and the angle θ2 of the second opening angle are known quantities. The opening angle is the angle between the straight segment and the plane perpendicular to the axis of the grinding wheel 2. Of course, the cross-sectional profile of the grinding wheel 2 is not limited thereto. In addition, according to the different drill bits 1 to be processed, the grinding wheel 2 is not limited to the above-mentioned specific structural form. For example, the grinding wheel 2 can also include three or four connected arc segments.

[0131] Specifically, x0 and y0 can be determined by the coordinate correspondence between the points on the cross-sectional profile of the chip groove and the coordinate correspondence between the points on the cross-sectional profile of the grinding wheel 2, the conversion relationship between the plane rectangular coordinate system and the space rectangular coordinate system, and the grinding wheel profile function, which specifically includes the following steps: determine the cross-sectional profile function of the grinding wheel 2, and according to the relationship ①-⑤, convert the cross-sectional profile function of the grinding wheel 2 into a function in the space coordinate system, and the corresponding relationship between x0 and y0 can be obtained according to the converted cross-sectional profile function of the grinding wheel 2, and the initial values ​​of x0 and y0 can be obtained using the corresponding relationship between x0 and y0.

[0132] Set the center coordinates of the first arc segment to (a1, b1) and the center coordinates of the second arc segment to (a2, b2). Because the center of the second arc segment passes through the Y' axis, the center coordinates of the second arc segment are (0, R2).

[0133] Then the equation of the circle where the first arc segment lies can be expressed as:

[0134]

[0135] The equation of the circle where the second arc segment lies can be expressed as:

[0136]

[0137] From the equation of the circle where the second arc segment is located, the angle θ2 of the second opening angle, and the center angle ω2, the intersection P1 of the circle where the first arc segment is located and the circle where the second arc segment is located can be obtained. According to P1 and the angle θ1 of the first opening angle, and the center angle ω1, the coordinates of the center of the first arc segment can be calculated as (a1, b1), thereby obtaining the equation of the circle where the first arc segment is located.

[0138] The function of the cross-sectional profile of the grinding wheel 2 can be expressed as:

[0139]

[0140] Combining ①, ② and the function of the cross-sectional profile of grinding wheel 2, we get:

[0141]

[0142]

[0143] Combining ③-⑤ and substituting into ⑥ and ⑦, we can get

[0144]

[0145] The corresponding relationship between x0 and y0 mentioned above can be obtained according to ⑨, ⑩ and the groove surface function of the chip groove 11, and then the initial values ​​of x0 and y0 can be obtained, which will not be repeated here.

[0146] The function of the cutting edge 12 can be solved based on the coordinates of multiple feature points on the cutting edge 12. For example, the coordinates of the intersection of the two center lines 115 and its other two end points, as well as the coordinates of the intersection of the main cutting edge 131 and the transverse edge 116 are substituted into the plane equations of the first back cutting edge 121 and the second back cutting edge 122 to obtain the cutting edge function, which can then be combined with the groove surface function of the chip groove 11 to obtain the equation of the intersection line 13.

[0147] Please combine Figure 2 and Figure 6a ,by Figure 6a Take the preset requirements corresponding to the blade surface 12 as an example:

[0148] Specifically, in the groove surface function of the chip groove 11 , y0 corresponds to the distance between the two main cutting edges 131 in the Y direction, and z0 corresponds to the difference in Y values ​​between the two end points of the main cutting edge 131 .

[0149] See also Figure 12 to Figure 14b , after step S9 and before step S11, further comprising:

[0150] S101 , determining whether the difference between the shortest distance between the two intersection lines 13 and the preset core thickness value is within a sixth preset range, if so, entering step S102 , if not, adjusting the y0 value of the groove surface function of the chip groove 11 .

[0151] See also Fig.13a and Fig.13b Specifically, it is determined whether the difference between the shortest distance between the two main cutting edges 131 and the preset core thickness value is within the sixth preset range. If not, the y0 value of the groove surface function of the chip groove 11 is adjusted. The larger y0 is, the larger the distance between the two main cutting edges 131 is. If the difference between the shortest distance and the preset core thickness value is greater than the upper limit of the sixth preset range, the y0 value is reduced. If the difference between the shortest distance and the preset core thickness value is less than the lower limit of the sixth preset range, the y0 value is increased.

[0152] S102, determining whether the coordinate difference between the two end points of the main cutting edge 131 in the axial direction of the drill bit is within the seventh preset range, if so, proceeding to the next step, if not, adjusting the z0 value of the groove surface function of the chip groove 11.

[0153] See also Fig.14a and Fig.14b , the intersection of the main cutting edge 131 and the rear edge 132 is the first endpoint of the main cutting edge 131, and the endpoint of the other end of the main cutting edge 131 is the second endpoint. The larger the z0 value is, the larger the difference between the Y values ​​of the first endpoint and the second endpoint is. If the difference between the Y values ​​of the first endpoint and the second endpoint is greater than the upper limit of the seventh preset range, the z0 value is reduced. If the difference between the Y values ​​of the first endpoint and the second endpoint is less than the lower limit of the seventh preset range, the z0 value is increased. n value.

[0154] The rear edge 132 is provided with a first preset point, a second preset point and a third preset point; wherein the first preset point is located on a straight line perpendicular to the first set plane, the straight line intersects perpendicularly with the axis of the drill 1, the distance between the second preset point and the first preset point is within the first preset range, and the third preset point is closer to the intersection of the main cutting edge 131 and the rear edge 132 than the second preset point or the third preset point is the second preset point. The first arc segment corresponds to the main cutting edge 131 and the rear edge 132, the portion between the end point intersecting the main cutting edge 131 and the third preset point, and the second arc segment corresponds to the portion between the second preset point on the rear edge 132 and the end point of the rear edge 132 away from the main cutting edge 131. The portion between the third preset point and the second preset point on the rear edge 132 generally corresponds to the second arc segment, but there is an error when the grinding wheel 2 grooves the drill 1, so the portion between the third preset point and the second preset point on the rear edge 132 may also correspond to the first arc segment.

[0155] See also Figure 15 to Figure 19c Specifically, step S11 includes:

[0156] S111, determining whether the distances from each point of the main cutting edge 131 to the second setting plane are within a second preset range, if so, proceeding to step S112, if not, adjusting the parameter value of the first arc segment and returning to step S3, wherein the second setting plane is parallel to the first setting plane or is the first setting plane;

[0157] Specifically, the first set plane is the OXZ plane. For ease of understanding, the second set plane is taken as the OXZ plane as an example below, but this should not be construed as a limitation to the present application.

[0158] See also Fig.16a and Fig.16b If the distances from each point of the main cutting edge 131 to the OXZ plane obviously decrease first and then increase as its X value increases, at this time the distances from each point of the main cutting edge 131 to the OXZ plane are lower than the lower limit of the second preset range, and the radius of the first arc segment should be increased; if the distances from each point of the main cutting edge 131 to the OXZ plane obviously increase first and then decrease as its X value increases, at this time the distances from each point of the main cutting edge 131 to the OXZ plane are higher than the upper limit of the second preset range, and the radius of the first arc segment should be reduced.

[0159] S112, determine whether the distances from the intersection of the main cutting edge 131 and the rear edge 132 and each point between the third preset point on the rear edge 132 to the first set plane are within the third preset range, if so, proceed to step S113, if not, adjust the parameter value of the first central angle and return to step S3.

[0160] See also Fig.17 Specifically, when the distance from each point between the intersection of the main cutting edge 131 and the rear edge 132 and the third preset point on the rear edge 132 to the first set plane is less than the lower limit of the third preset range, the rear edge 132 is concave, and the first center angle should be increased at this time; and when the distance from each point between the intersection of the main cutting edge 131 and the rear edge 132 and the third preset point on the rear edge 132 to the first set plane is greater than the upper limit of the third preset range, the first center angle should be reduced.

[0161] S113, determine whether the distance from the second preset point on the rear edge 132 to the first set plane is within a fourth preset range, if so, proceed to the next step, if not, adjust the parameter value of the second central angle and return to step S3.

[0162] Specifically, the distance between the second preset point and the point on the rear edge 132 where the X value is 0 (the first preset point) is within the fourth preset range. Of course, the second preset point may also be the point on the rear edge 132 where the X value is 0.

[0163] See also Figure 18 to Figure 19c, in order to avoid the concave profile of the grinding wheel 2, ω2 must satisfy: ω2-θ2≤ω1-θ1. First, let ω2=ω1-θ1+θ2, and judge whether the profile of the rear edge 1 32 satisfies the fourth preset range condition. If the Y value of the second preset point is higher than the upper limit of the fourth preset range, the ω2 value is reduced. If the Y value of the second preset point is lower than the lower limit of the fourth preset range, the ω2 value is increased. For example, with Figure 6a Compared with the blade 12, Fig.19a The Y value of the second preset point is within the fourth preset range and no adjustment is required. Fig.19b The Y value of the second preset point is higher than the fourth preset range, and ω2 needs to be reduced. Fig.19c The Y value of the second preset point is lower than the lower limit of the fourth preset range, and ω2 needs to be increased.

[0164] The upper limit of the third preset range is smaller than the lower limit of the fourth preset range.

[0165] Optionally, if the determination result in S11 is yes, before step S13, the method further includes:

[0166] S12, determine whether the distance between the two intersection lines of the groove surface of the chip groove 11 and the outer diameter circumferential surface 14 of the drill bit 1 is within the fifth preset range, if so, proceed to the next step, if not, adjust the radius of the second arc segment and return to step S3.

[0167] See also Figure 1 and Figure 4 Specifically, the distance between the groove surface of the chip groove 11 and the outer diameter circumferential surface 14 of the drill bit 1 is the width d1 of the chip groove 11 .

[0168] Of course, the above explanations are only for ease of understanding and are not limited by the coordinate system or specific function form in the specific example. When the coordinate systems of the grinding wheel 2 and the drill 1 are changed to another form (such as the coordinate systems of the grinding wheel 2 and the drill 1 are both polar coordinate systems, and the corresponding functions are all polar coordinate equations), the above method is still applicable.

[0169] It should be understood that the specific profile of the grinding wheel 2 is not limited, and the cross-sectional profile of the grinding wheel 2 can be composed of one or more arc segments. For example, when the grinding wheel 2 includes a first straight line segment, a circular arc segment, and a second straight line segment connected in sequence, it is only necessary to adjust the radius of the circular arc segment of the grinding wheel 2. For another example, when the grinding wheel 2 includes a first straight line segment, multiple circular arc segments, and a second straight line segment connected in sequence, it is necessary to adjust the center angle and radius of each circular arc segment of the grinding wheel 2, as well as the starting angle of any intermediate circular arc segment connected to the previous circular arc segment. Among them, the starting angle and the center angle of the circular arc segment at least determine the shape of the connection between the circular arc segment and the previous circular arc segment, and the radius of the circular arc segment determines the shape of the blade 12 of the circular arc segment at the corresponding position on the drill bit 1. Similarly, the cross-sectional profile of the grinding wheel 2 that meets the preset requirements can be obtained based on the design method of the present application.

[0170] The embodiment of the present application further discloses a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the above-mentioned method for designing the drill bit slot sand profile is implemented.

[0171] The above disclosure is only a preferred example of the present application and cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are all within the scope covered by the present application.

Claims

1. A method for designing a drill bit slot sand profile, characterized in that: include: S1, constructing a function of the motion trajectory of the grinding wheel relative to the drilling needle when the grinding wheel is grooving according to the structural parameters of the drilling needle and generating various parameter values ​​of the cross-sectional profile of the grinding wheel; S3, constructing a cross-sectional profile function of the grinding wheel according to each of the parameter values; S5, constructing a chip groove cross-sectional profile function of the chip groove of the drill bit according to the offset angle of the grinding wheel and the cross-sectional profile function of the grinding wheel; S7, constructing a groove surface function of the chip groove of the drill bit according to the function of the motion trajectory and the chip groove cross-sectional profile function; S9, obtaining a function of the intersection line between the chip groove and the cutting edge of the drill bit according to the groove surface function and the cutting edge function of the drill bit, wherein the cutting edge function is constructed according to the structural parameters of the drill bit; S11, determining whether the intersection line meets the preset requirements in the direction perpendicular to the first set plane, if yes, proceeding to the next step, if no, adjusting the corresponding parameter value and returning to step S3, wherein the first set plane is a plane passing through the axis of the drill bit and the center line of the blade face; S13, determining whether the latest cross-sectional profile function of the grinding wheel meets the design requirements.

2. The method for designing the profile of a drill bit slotted sand as claimed in claim 1, characterized in that: The intersection line includes a main cutting edge and a rear edge, and the main cutting edge and the rear edge are connected; The parameters of the cross-sectional profile of the grinding wheel include: a first arc segment, a first center angle, a second arc segment and a second center angle, the first arc segment and the second arc segment are connected, the first center angle is the center angle of the first arc segment, and the second center angle is the center angle of the second arc segment; A first preset point, a second preset point and a third preset point are provided on the rear edge; wherein the first preset point is located on a straight line perpendicular to the first setting plane, the straight line intersects the axis of the drill needle perpendicularly, the distance between the second preset point and the first preset point is within a first preset range, the third preset point is closer to the intersection of the main cutting edge and the rear edge than the second preset point or the third preset point is the second preset point, the first arc segment corresponds to the main cutting edge and the portion of the rear edge between the end point intersecting the main cutting edge and the third preset point, and the second arc segment corresponds to the portion of the rear edge between the second preset point and the end point of the rear edge away from the main cutting edge; Step S11 includes: S111, determining whether the distance from each point of the main cutting edge to the second setting plane is within a second preset range, if so, proceeding to step S112, if not, adjusting the parameter value of the first arc segment and returning to step S3, wherein the second setting plane is parallel to the first setting plane or is the first setting plane; S112, determining whether the distances from each point between the intersection of the main cutting edge and the trailing edge and the third preset point to the first set plane are within a third preset range, if so, proceeding to step S113, if not, adjusting the parameter value of the first central angle and returning to step S3; S113, determining whether the distance from the second preset point to the first set plane is within a fourth preset range, if so, proceeding to the next step, if not, adjusting the parameter value of the second central angle and returning to step S3; The upper limit of the third preset range is smaller than the lower limit of the fourth preset range.

3. The method for designing the profile of a drill bit slotted sand as claimed in claim 1, characterized in that: If the determination result in step S11 is yes, then before step S13, the method further includes: S12, determine whether the distance between the two intersection lines of the groove surface of the chip groove and the outer diameter circumference surface of the drill bit is within the fifth preset range, if so, proceed to the next step, if not, adjust the corresponding parameter value and return to step S3.

4. The method for designing a drill bit slot sand profile as claimed in claim 1, characterized in that: The drill needle comprises two symmetrically arranged chip removal grooves, and the two chip removal grooves intersect with the cutting surface to form two intersection lines; The intersection line includes a main cutting edge; After step S9 and before step S11, the method further includes: S101, determining whether the difference between the shortest distance between the two intersection lines and the preset core thickness value is within a sixth preset range, if so, proceeding to step S102; S102, determining whether the coordinate difference between the two end points of the main cutting edge in the axial direction of the drill bit is within a seventh preset range, and if so, proceeding to the next step.

5. The method for designing the profile of a drill bit slotted sand as claimed in claim 1, characterized in that: Taking the center line of the blade surface as the X-axis, the axis of the drill needle as the Z-axis, and the center point of the blade surface as the first origin, a spatial rectangular coordinate system of the drill needle is established; The function of the motion trajectory is: Wherein, x, y and z are the coordinates of the point on the motion trajectory, A is the initial phase in the X-axis direction, B is the initial phase in the Y-axis direction, R i is the radius of the spiral line where the point (x, y) is located, is the helix angle of the drill bit.

6. The method for designing the profile of a drill bit slotted sand as claimed in claim 5, characterized in that: Establishing a plane rectangular coordinate system of the cross-sectional profile of the grinding wheel, wherein the plane rectangular coordinate system takes the lowest point of the cross-sectional profile of the grinding wheel as a second origin, and an X' axis of the plane rectangular coordinate system is parallel to the axis of the grinding wheel; The corresponding relationship between the coordinates of the points on the cross-sectional profile of the chip removal groove and the coordinates of the points on the cross-sectional profile of the grinding wheel is: x′ p =x′ / cosθ offset , and' p =y′; Among them, x′ p and y′ p is the coordinate of a point on the cross-sectional profile of the chip groove, x′ and y′ are the coordinates of a point on the cross-sectional profile of the grinding wheel, θ offset is the offset angle of the grinding wheel.

7. The method for designing the profile of a drill bit slotted sand as claimed in claim 6, characterized in that: The conversion relationship between the plane rectangular coordinate system and the space rectangular coordinate system is: y=y′ p +y0, The groove surface function of the chip removal groove is: Among them, x0, y0 and z0 are the initial values ​​of the groove surface function of the chip groove, and R is the radius of the drill needle.

8. The method for designing the profile of a drill bit slotted sand as claimed in claim 7, characterized in that: The drill needle comprises two symmetrically arranged chip removal grooves, and the two chip removal grooves intersect with the cutting surface to form two intersection lines; The intersection line includes a main cutting edge; After step S9 and before step S11, the method further includes: S101, determining whether the difference between the shortest distance between the two intersection lines and the preset core thickness value is within a sixth preset range, if so, proceeding to step S102, if not, adjusting the y0 value of the groove surface function of the chip removal groove; S102, determining whether the coordinate difference between the two end points of the main cutting edge in the axial direction of the drill bit is within a seventh preset range, if so, proceeding to the next step, if not, adjusting the z0 value of the groove surface function of the chip groove.

9. The method for designing the profile of a drill bit slotted sand as claimed in claim 6, characterized in that: The parameters of the cross-sectional profile of the grinding wheel include: a first arc segment, a first center angle, a second arc segment and a second center angle, the first arc segment and the second arc segment are connected, the first center angle is the center angle of the first arc segment, and the second center angle is the center angle of the second arc segment; The second origin is a point on the second arc segment, and the Y′ axis of the plane rectangular coordinate system passes through the center of the second arc segment. The equation of the first arc segment is: The equation of the second arc segment is: Among them, x′1 and y′1 are the coordinates of the point on the circle where the first arc segment is located in the plane rectangular coordinate system, a1 and b1 are the coordinates of the center of the circle where the first arc segment is located, R1 is the radius of the circle where the first arc segment is located, x′2 and y′2 are the coordinates of the point on the circle where the second arc segment is located in the plane rectangular coordinate system, and R2 is the radius of the circle where the second arc segment is located.

10. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the method for designing the drill bit slot sand profile as claimed in any one of claims 1 to 9 is implemented.

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