A tube cutting part cutting method and system

Abstract

The present application relates to a kind of pipe cutting part cutting method and system, the method includes, S1, the three-dimensional model of the part to be cut is obtained, and based on the three-dimensional model of the part to be cut, the first two-dimensional plane corresponding to the part to be cut is obtained;The three-dimensional model of the part to be cut includes the initial three-dimensional cutting path of the port of the part to be cut;The first two-dimensional plane corresponding to the part to be cut is the plane obtained by cutting the cutting part along axial and spreading the surface of the part to be cut to two-dimensional plane;S2, based on two-dimensional plane path and the axial direction of the part to be cut, using the pre-set compensation strategy, two-dimensional plane path is compensated, and the compensated two-dimensional plane path is obtained, and the compensated two-dimensional plane path is wrapped to the part to be cut, and the final three-dimensional cutting path of the port of the part to be cut is obtained;S3, according to final three-dimensional cutting path, the part to be cut is cut, and the cut part is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of part cutting, in particular to a pipe cutting part cutting method and system. BACKGROUND

[0002] In the pipe cutting nesting software, there is a process called kerf compensation (or compensation), which aims to compensate for the kerf width of the laser cutter during the laser cutting process to improve the machining accuracy of the part.

[0003] However, the existing compensation scheme is based on two-dimensional expansion path compensation. That is, the cutting path in the three-dimensional pipe material is expanded into a two-dimensional planar graph. Then the two-dimensional graph is compensated, because this compensation is carried out in a two-dimensional plane, simply considering the width of the kerf, the compensation distance is translated inward or outward along the cutting path. However, this compensation method ignores the complexity of the three-dimensional cutting path in space, especially for oblique cutting paths, two-dimensional compensation cannot accurately reflect the true cutting situation in three-dimensional space during cutting. Finally, the compensated graph is wrapped back. This will introduce a problem, which is that the path that appears to be oblique on the original pipe material will be deformed into a curved oblique cut after compensation. This will cause the final machining shape of the part to be slightly deformed, and the greater the oblique degree of the cut, the more serious the deformation. SUMMARY

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides a pipe cutting part cutting method and system.

[0005] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the present application includes:

[0006] In a first aspect, the present application provides a pipe cutting part cutting method, comprising,

[0007] S1, obtaining a three-dimensional model of a part to be cut, and based on the three-dimensional model of the part to be cut, obtaining a first two-dimensional plane corresponding to the part to be cut;

[0008] The three-dimensional model of the part to be cut includes an initial three-dimensional cutting path of a port of the part to be cut; the part to be cut is a tubular part;

[0009] The first two-dimensional plane corresponding to the part to be cut is a plane obtained by cutting the part to be cut along the axial direction and expanding the surface of the part to be cut to a two-dimensional plane;

[0010] Among them, the first two-dimensional plane includes a two-dimensional plane path corresponding to the initial three-dimensional cutting path expanded to the two-dimensional plane;

[0011] S2, based on the two-dimensional plane path and the axial direction of the part to be cut, a pre-set compensation strategy is adopted to compensate the two-dimensional plane path, to obtain a compensated two-dimensional plane path, and the compensated two-dimensional plane path is wrapped onto the part to be cut to obtain a final three-dimensional cutting path of the part to be cut port;

[0012] S3, cutting the part to be cut according to the final three-dimensional cutting path to obtain a cut part.

[0013] Preferably, the S1 specifically comprises:

[0014] Based on the three-dimensional model of the part to be cut, an initial three-dimensional cutting path of the part to be cut port is obtained, and the initial three-dimensional cutting path is discretized into a contour line;

[0015] Based on the contour line, a line in a two-dimensional graph corresponding to the contour line in a first two-dimensional plane is obtained;

[0016] The initial three-dimensional cutting path comprises a plurality of cutting line segments with cutting directions connected in sequence according to a cutting sequence;

[0017] Wherein, the two-dimensional plane path corresponding to the initial three-dimensional cutting path is the line in the two-dimensional graph corresponding to the contour line.

[0018] Preferably,

[0019] The S2 specifically comprises:

[0020] S21, based on the pipe stretching direction and the development direction of the contour line, each line segment in the line in the two-dimensional graph is respectively translated according to a pre-set translation strategy, to obtain a translated line segment;

[0021] Wherein, the pipe stretching direction is the axial direction of the part to be cut;

[0022] The development direction of the contour line is a direction perpendicular to the axial direction of the part to be cut;

[0023] S22, the translated line segments are connected according to the cutting sequence to obtain connected translated line segments;

[0024] S23, when the connected translated line segments meet a pre-set condition, the connected translated line segments in the two-dimensional graph of the part to be cut are wrapped onto the part to be cut to obtain a final three-dimensional cutting path of the part to be cut port.

[0025] Preferably,

[0026] The pre-set condition is that the first translated line segment and the second translated line segment have no intersection point;

[0027] The first translated line segment is any translated line segment;

[0028] The second translated line segment is a line segment adjacent to the first translated line segment in the cutting order.

[0029] Preferably,

[0030] The S21 specifically comprises that the translation strategy specifically comprises:

[0031] When the angle between the cutting direction of any line segment in the line in the two-dimensional graph and the contour line development direction is greater than or equal to -45° and less than 45°, the line segment is translated in the pipe material stretching direction as the translation direction by a preset compensation distance;

[0032] When the angle between the cutting direction of any line segment in the line in the two-dimensional graph and the contour line development direction is greater than or equal to 45° and less than 135°, the line segment is translated in the opposite direction of the contour line development direction as the translation direction by a preset compensation distance;

[0033] When the angle between the cutting direction of any line segment in the line in the two-dimensional graph and the contour line development direction is greater than or equal to 135° or less than -135°, the line segment is translated in the opposite direction of the pipe material stretching direction as the translation direction by a preset compensation distance;

[0034] When the angle between the cutting direction of any line segment in the line in the two-dimensional graph and the contour line development direction is greater than or equal to -135° and less than -45°, the line segment is translated in the contour line development direction as the translation direction by a preset compensation distance.

[0035] Preferably, the S22 specifically comprises:

[0036] S221, in the translated line segment, when the translation directions corresponding to any two adjacent translated line segments in the cutting order are consistent, the two adjacent translated line segments are connected;

[0037] S222, in the translated line segment, when there is an intersection between any two adjacent translated line segments in the cutting order, the line segment after the intersection in the first translated line segment of the two adjacent translated line segments is deleted, and the line segment before the intersection in the second translated line segment of the two adjacent translated line segments is deleted;

[0038] S223, in the translated line segment, when there is no intersection between any two adjacent translated line segments in the cutting order, the two adjacent translated line segments are connected by using the first connection mode or the second connection mode or the third connection mode.

[0039] Preferably,

[0040] The first connection mode is:

[0041] The intersection of the straight lines on which the two adjacent translated line segments respectively lie is connected as the connection point of the two adjacent translated line segments.

[0042] Preferably,

[0043] The second connection mode is:

[0044] A first circular arc is arranged at the intersection of the straight lines on which the two adjacent translated line segments respectively lie, so that the first circular arc is tangent to the two adjacent translated line segments respectively;

[0045] The tangent point of the first translated line segment in the two adjacent translated line segments and the first circular arc and the tangent point of the second translated line segment and the first circular arc are smoothly connected through the first circular arc;

[0046] The first circular arc is a circular arc with a pre-set compensation distance as a radius.

[0047] Preferably,

[0048] The third connection mode is:

[0049] The end point of the first translated line segment in the two adjacent translated line segments and the start point of the second translated line segment are connected to obtain a first line segment;

[0050] The first line segment is translated in a first direction, so that the distance between the translated first line segment and the first intersection point is a pre-set compensation distance;

[0051] The first direction is a direction from the first intersection point to the first line segment;

[0052] The first intersection point is the intersection point of the two adjacent translated line segments before translation;

[0053] The first translated line segment in the two adjacent translated line segments is extended in the direction from the start point to the end point and intersects the first translated line segment at a first point, and the second translated line segment in the two adjacent translated line segments is extended in the opposite direction from the end point to the start point and intersects the first translated line segment at a second point, so that the two adjacent translated line segments are connected through the second line segment after being respectively extended;

[0054] The two ends of the second line segment are the first point and the second point respectively.

[0055] In another aspect, the embodiment also provides a pipe part cutting system, comprising:

[0056] CNC cutting equipment and controllers;

[0057] The controller controls the data cutting device to cut the part to be cut according to the tube cutting part cutting method as described in the first aspect.

[0058] The beneficial effects of this invention are as follows: The pipe cutting method and system of this invention, based on the two-dimensional planar path and the axial direction of the part to be cut, employs a pre-set compensation strategy to compensate the two-dimensional planar path. Compared to existing technologies, by combining axial information for compensation, the path bending or deformation problems caused by compensation based solely on the two-dimensional plane can be avoided. This ensures that the compensated path maintains stable shape and angles when it is re-encased in the three-dimensional model, adapting to the cutting of pipes with complex geometries, improving cutting accuracy, and increasing design and operational flexibility. Attached Figure Description

[0059] Figure 1 This is a flowchart of a tube cutting method according to the present invention;

[0060] Figure 2 This is a schematic diagram of lines in a two-dimensional graphic in an embodiment of the present invention;

[0061] Figure 3 This is a schematic diagram of a tube cutting system according to an embodiment of the present invention. Detailed Implementation

[0062] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0063] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0064] See Figure 1 This embodiment provides a method for cutting tubular parts, including,

[0065] S1. Obtain a three-dimensional model of the part to be cut, and based on the three-dimensional model of the part to be cut, obtain the first two-dimensional plane corresponding to the part to be cut.

[0066] The three-dimensional model of the part to be cut includes the initial three-dimensional cutting path of the port of the part to be cut; the part to be cut is a tubular part;

[0067] In this embodiment, a CAD software (such as SolidWorks, AutoCAD, CATIA, etc.) is used to create a three-dimensional model of the part to be cut. The three-dimensional model contains all the geometric details of the part to be cut, including the shape and size of the port. In the three-dimensional model, the position and shape of the port that needs to be cut are clearly marked. This can include straight cuts, bevel cuts, complex profile shapes, etc. The CAD software provides a section tool that can take a cross-section of the three-dimensional model on a specific plane to generate an initial three-dimensional cutting path for the port.

[0068] The first two-dimensional plane corresponding to the part to be cut is the plane obtained by cutting the part to be cut along the axial direction and unfolding the surface of the part to be cut onto a two-dimensional plane;

[0069] The first two-dimensional plane includes a two-dimensional plane path corresponding to the initial three-dimensional cutting path unfolded onto a two-dimensional plane;

[0070] In this embodiment, the part to be cut (usually a tubular part) is cut along its axial direction (i.e. along the length direction of the tube). This step cuts one side of the tube, allowing it to be unfolded into a plane. The cut surface of the tube is unfolded into a plane. This process is similar to unfolding the surface of a cylinder into a rectangular plane. For example, if there is a cylindrical tube, cutting it along its length direction and unfolding it flat will result in a rectangular plane.

[0071] In this embodiment, slit compensation on a two-dimensional plane is simpler and more intuitive than in three-dimensional space, making it easier to operate and adjust. The path on the two-dimensional plane is easier to control accurately, and the compensated path can better reflect the width of the slit, improving cutting accuracy. Through the unfolding method in this embodiment, the deformation of the compensated path can be reduced to some extent, especially for complex three-dimensional cutting paths.

[0072] S2, based on the two-dimensional plane path and the axial direction of the part to be cut, a pre-set compensation strategy is used to compensate the two-dimensional plane path to obtain a compensated two-dimensional plane path, and the compensated two-dimensional plane path is wrapped onto the part to be cut to obtain a final three-dimensional cutting path for the port of the part to be cut;

[0073] In this embodiment, the compensation is combined with the axial information, which can more accurately reflect the influence of the slit width and improve the accuracy of the cutting path. Through the compensation strategy, the compensation is performed on the two-dimensional plane, and then the path is remapped back to the three-dimensional model, reducing the deformation of the path caused by compensation.

[0074] S3, according to the final three-dimensional cutting path, the part to be cut is cut to obtain a cut part.

[0075] In the practical application of the embodiment, the S1 specifically comprises:

[0076] Based on the three-dimensional model of the part to be cut, an initial three-dimensional cutting path of the part-to-be-cut port is obtained, and the initial three-dimensional cutting path is discretized into a contour line;

[0077] Based on the contour line, a line in a two-dimensional graph corresponding to the contour line in a first two-dimensional plane is obtained;

[0078] The initial three-dimensional cutting path comprises a plurality of cutting line segments with cutting directions connected in sequence according to a cutting sequence;

[0079] The two-dimensional plane path corresponding to the initial three-dimensional cutting path is the line in the two-dimensional graph corresponding to the contour line.

[0080] In the embodiment, the initial three-dimensional cutting path is discretized into a contour line and mapped into a two-dimensional plane, so that the accurate representation of the path can be ensured. The path compensation in the two-dimensional plane is relatively simple and intuitive, and the compensation amount can be adjusted more accurately. The embodiment can better control the cutting path through discretization and two-dimensional mapping, and improve the cutting accuracy.

[0081] Specifically, the S2 specifically comprises:

[0082] S21, based on the pipe material stretching direction and the development direction of the contour line, each line segment in the line in the two-dimensional graph is respectively translated according to a pre-set translation strategy, to obtain a translated line segment;

[0083] The pipe material stretching direction is the axial direction of the part to be cut;

[0084] The development direction of the contour line is a direction perpendicular to the axial direction of the part to be cut;

[0085] By combining the axial direction of the pipe material and the development direction for translation compensation, the adjustment of the cutting path can be more accurately controlled, and the compensated path can be ensured to be accurate. The error caused by simple two-dimensional development compensation is avoided, and the compensation for oblique cutting and complex paths is more accurate.

[0086] Referring to Figure 2 , it is assumed Figure 2The lines in the two-dimensional figure include line segment 1, line segment 2, line segment 3, line segment 4, line segment 5, line segment 6, line segment 7, line segment 8, line segment 9 connected in turn according to the cutting order, and then, after translation according to a preset translation strategy, line segment a, line segment b, line segment c, line segment d, line segment e, line segment f, line segment g, line segment h, and line segment i are obtained, respectively; wherein line segment a is the line segment after the translation of line segment 1, line segment a is the line segment after the translation of line segment 1, line segment a is the line segment after the translation of line segment 1, line segment b is the line segment after the translation of line segment 2, line segment c is the line segment after the translation of line segment 3, line segment d is the line segment after the translation of line segment 4, line segment e is the line segment after the translation of line segment 5, line segment f is the line segment after the translation of line segment 6, line segment g is the line segment after the translation of line segment 7, line segment h is the line segment after the translation of line segment 8, and line segment i is the line segment after the translation of line segment 9.

[0087] S22, connecting the translated line segments according to the cutting order to obtain the connected translated line segments.

[0088] In this embodiment, the translated line segments are connected according to the cutting order, ensuring the continuity and correctness of the path and avoiding the problems of path breakage or incorrect order.

[0089] S23, when the connected translated line segments meet a preset condition, the connected translated line segments in the two-dimensional figure of the part to be cut are coated onto the part to be cut to obtain the final three-dimensional cutting path of the port of the part to be cut.

[0090] In this embodiment, the preset condition is checked to ensure that the generated path meets specific requirements, improving the reliability of the path.

[0091] In this embodiment, the preset condition is that the first translated line segment and the second translated line segment have no intersection point.

[0092] The first translated line segment is any translated line segment.

[0093] The second translated line segment is the adjacent line segment after the first translated line segment according to the cutting order.

[0094] For example, assume that the translated line segments have the following cutting order: A, B, C, D.

[0095] Select the first line segment: assume that A is selected as the first translated line segment.

[0096] Determine the second line segment: according to the cutting order, the line segment next to A is B, so B is the second translated line segment.

[0097] Check if there is an intersection between other line segments (i.e. C, D) other than A and B. If A has an intersection with C or A has an intersection with D, the pre-set condition is not met. If A only has an intersection with B, or has no intersection at all, the condition is met.

[0098] Through this condition check in the embodiment, it is ensured that the cutting path does not intersect in the two-dimensional plane, thereby maintaining the continuity of the path. Avoiding path intersection or overlap improves the correctness and quality of the cutting path. This method ensures that each translated line segment forms an accurate compensation path after connection, reduces errors, and improves cutting precision. It is suitable for complex cutting paths, especially in the case of accurate connection of multiple cutting paths, and can effectively manage and adjust the path.

[0099] Specifically, the S21 specifically includes that the translation strategy specifically includes:

[0100] When the cutting direction of any one line segment in the line in the two-dimensional graph and the contour line development direction angle is greater than or equal to-45° and less than 45°, the line segment is stretched to the pipe material direction as the translation direction to translate the pre-set compensation distance;

[0101] Specifically, when the cutting direction of the line segment and the contour line development direction are close to parallel, the cutting of the line segment is mainly along the axial direction. At this time, the width compensation of the cutting path should be carried out along the axial direction of the pipe to ensure the compensation of the width of the laser cutting during the axial cutting.

[0102] For example, when a pipe, the cutting direction is almost parallel to the development direction (horizontal). In order to compensate the width of the laser cutting, it is more appropriate to perform translation along the axial direction of the pipe (perpendicular to the development direction).

[0103] When the cutting direction of any one line segment in the line in the two-dimensional graph and the contour line development direction angle is greater than or equal to 45° and less than 135°, the line segment is stretched to the opposite direction of the contour line development direction as the translation direction to translate the pre-set compensation distance;

[0104] In the embodiment, when the cutting direction of the line segment and the contour line development direction are close to perpendicular, the cutting of the line segment is mainly along the vertical direction of the development plane. At this time, the width compensation of the cutting path should be carried out along the opposite direction of the development direction to ensure the compensation of the width of the laser cutting during the vertical cutting.

[0105] For example, when a pipe, the cutting direction is almost perpendicular to the development direction (i.e. almost perpendicular to the axial direction of the pipe). In order to compensate the width of the laser cutting, it is more appropriate to perform translation along the development direction (parallel to the pipe surface).

[0106] When the cutting direction of any line segment of the line in the two-dimensional figure is greater than or equal to 135° or less than -135° with the unwinding direction of the contour line, the opposite direction of the pipe stretching direction is taken as the translation direction of the line segment to translate the preset compensation distance;

[0107] When the cutting direction of the line segment is almost anti-parallel with the unwinding direction of the contour line, the cutting of the line segment is mainly along the anti-axial direction. At this time, the width compensation of the cutting path should be carried out in the opposite direction of the axial direction of the pipe to ensure the compensation of the width of the laser cutting during the anti-axial cutting.

[0108] For example, when a pipe, the cutting direction is almost opposite to the unwinding direction (i.e. opposite to the horizontal line). In order to compensate the width of the laser cutting, it is more appropriate to translate along the anti-axial direction of the pipe.

[0109] When the cutting direction of any line segment of the line in the two-dimensional figure is greater than or equal to -135° and less than -45° with the unwinding direction of the contour line, the unwinding direction of the contour line is taken as the translation direction of the line segment to translate the preset compensation distance.

[0110] When the cutting direction of the line segment is almost anti-vertically opposite to the unwinding direction of the contour line, the cutting of the line segment is mainly along the anti-vertically opposite direction of the unwinding plane. At this time, the width compensation of the cutting path should be carried out along the unwinding direction to ensure the compensation of the width of the laser cutting during the anti-vertically opposite cutting.

[0111] For example, when a pipe, the cutting direction is almost vertically opposite to the unwinding direction (i.e. vertically opposite to the axial direction of the pipe). In order to compensate the width of the laser cutting, it is more appropriate to translate along the unwinding direction.

[0112] In this embodiment, the laser cutting will have a kerf width, which is the width of material loss in the actual cutting process. The path is compensated on the two-dimensional unwinding plane to ensure the accuracy of the size of the final cut part. In this embodiment, the kerf width is compensated by translating the path, which can ensure that the final cut part meets the design size.

[0113] In the embodiment, when the cutting direction is close to the unfolding direction, the axial translation is selected because the main cutting error will accumulate along the axial direction. When the cutting direction is close to the vertical unfolding direction, the reverse direction translation of the unfolding direction is selected because the main cutting error will accumulate along the unfolding direction. Different translation directions corresponding to different angles ensure that the width error caused by laser cutting can be accurately compensated at each cutting angle. By selecting different translation directions at different angles, the embodiment can avoid overlapping or crossing of the compensated paths, and maintain the continuity and correctness of the cutting path. In addition, accurate selection of the translation direction can better control the shape of the path, especially in complex paths, reducing deformation and error.

[0114] In the embodiment, the S22 specifically includes:

[0115] S221, in the translated line segments, when the translation directions corresponding to any two adjacent translated line segments in the cutting sequence are consistent, the two adjacent translated line segments are connected;

[0116] In the embodiment, if the two adjacent translated line segments have the same translation direction in the cutting sequence, the two line segments are directly connected. The purpose of this is to maintain the continuity and consistency of the cutting path, and avoid unnecessary path interruption.

[0117] For example, assuming that there are two adjacent line segments A and B, and their translation directions are the same, the end of the line segment A and the start of the line segment B can be directly connected to form a continuous line segment.

[0118] S222, in the translated line segments, when there is an intersection between any two adjacent translated line segments in the cutting sequence, the line segment after the intersection in the first of the two adjacent translated line segments is deleted, and the line segment before the intersection in the second of the two adjacent translated line segments is deleted;

[0119] In the embodiment, if the two adjacent translated line segments have intersections after translation, the intersections need to be processed to avoid path overlap. The part after the intersection in the first line segment is deleted, and the part before the intersection in the second line segment is deleted. This ensures that the path is disconnected and reconnected at the intersection, and does not cause path crossing or overlap.

[0120] The embodiment avoids path overlap or crossing, thereby ensuring the accuracy and clarity of the cutting path.

[0121] For example, assuming that the line segments A and B intersect at a certain intersection, the part after the intersection in the line segment A is deleted, and the part before the intersection in the line segment B is deleted, and they are reconnected at the intersection.

[0122] S223、In the translated line segments, when there is no intersection between any two adjacent translated line segments in the cutting order, then the first connection method or the second connection method or the third connection method is used to connect the two adjacent translated line segments.

[0123] In this embodiment, the first connection method is direct connection, that is, connecting the end and the starting point of the two line segments with a straight line. The second connection method is to insert a specific transition line segment to ensure smooth transition. The third connection method is to make the two line segments seamlessly connected through a certain specific geometric transformation. It should be noted that in actual application process, in addition to the three connection methods mentioned in this embodiment, there can be other connection methods. In general, as long as any two adjacent translated line segments are connected, this embodiment does not specifically limit other connection methods other than the three connection methods mentioned in this embodiment.

[0124] This embodiment provides flexible connection methods to ensure the continuity and smoothness of the cutting path and avoid path interruption or mutation.

[0125] For example, assuming that there is no intersection between line segments A and B, they can be connected by a suitable method according to the specific situation, such as direct connection, insertion of a transition line segment or geometric transformation.

[0126] The first connection method is:

[0127] The intersection of the straight lines where the two adjacent translated line segments are located is taken as the connection point of the two adjacent translated line segments.

[0128] The line segments connected in this way in this embodiment can ensure the continuity of the path and avoid path interruption. This is very important in the cutting process, because path interruption may cause inconsistency in cutting.

[0129] Finding the intersection of the straight lines and taking it as the connection point helps to maintain the accuracy of the cutting path. Because the intersection is a geometrically accurate connection point, it reduces the error caused by manual connection. Using the intersection of the straight lines as the connection point helps to maintain the shape of the cutting path and reduces the deformation problem caused by path compensation. Especially after translation compensation, the geometric shape of the path can be better maintained. This method can adapt to different translation directions and angles, providing a general connection method that does not need to be handled separately for each situation, increasing the generality and flexibility of the method.

[0130] For example, suppose there are two adjacent translated line segments A and B: line segment A: from point A1 to point A2; line segment B: from point B1 to point B2; extend A1A2 to obtain line L1. Extend B1B2 to obtain line L2. Calculate the intersection point of lines L1 and L2, let's say point C. Connect point A2 to point C. Connect point C to point B1. The result is a continuous path, from A1 to A2, then to C, then to B1, and then to B2.

[0131] In this embodiment, the second connection method is: a first arc is set at the intersection of the straight lines where two adjacent translated line segments are located, such that the first arc is tangent to the two adjacent translated line segments respectively;

[0132] Smoothly connect the first translated line segment to the first arc and the second translated line segment to the first arc through the first arc.

[0133] The first arc is an arc with a pre-set compensation distance as its radius.

[0134] In this embodiment, the second connection method enables a smooth transition between two line segments, avoiding the abrupt changes caused by straight-line connections and resulting in a smoother cutting path. In machining or material cutting, abrupt path changes can lead to stress concentration, affecting material strength and lifespan. Arc connections can reduce this stress concentration and improve the mechanical properties of the parts. Arc connections can more accurately compensate for the kerf width in laser cutting, making the final cut parts more in line with design requirements and improving processing accuracy. Arc connections make the cutting path smoother and more aesthetically pleasing, especially in the processing of parts with high appearance requirements; a smooth path enhances the visual appeal of the parts. Furthermore, the use of arcs effectively avoids path intersections and overlaps at the connection points, ensuring a clear and accurate cutting path.

[0135] For example, suppose there are two adjacent translated line segments A and B: line segment A: from point A1 to point A2; line segment B: from point B1 to point B2. Extend the lines containing line segments A and B to find their intersection point C. At intersection point C, create an arc with a radius equal to a pre-defined compensation distance. Determine the points of tangency, D1 and D2, where the arc is tangent to line segments A and B respectively. Through arcs D1 and D2, a smooth connection between line segments A and B is achieved, forming a continuous path from A1 to D1, then to D2, and finally to B2.

[0136] In this embodiment, the third connection method is:

[0137] Connect the endpoint of the first translated line segment to the starting point of the second translated line segment to obtain the first line segment;

[0138] translating the first line segment in a first direction such that the distance between the translated first line segment and the first intersection point is a pre-set compensation distance;

[0139] wherein the first direction is from the first intersection point to the first line segment;

[0140] the first intersection point is the intersection point of the two adjacent translated line segments before translation;

[0141] extending the first of the two adjacent translated line segments in the direction from the start point to the end point and intersecting the translated first line segment at a first point, and extending the second of the two adjacent translated line segments in the opposite direction from the end point to the start point and intersecting the translated first line segment at a second point, such that the two adjacent translated line segments are connected by the second line segment after extension;

[0142] the two ends of the second line segment are the first point and the second point, respectively.

[0143] In this embodiment, the third connection method translates the line segment by a pre-set compensation distance, ensuring the accuracy and consistency of compensation, which helps to achieve higher accuracy in laser cutting. By translating and extending the line segment, it ensures that the connection path does not overlap with the original path, avoiding the problem of repeated paths in the cutting process. By extending the line segment and connecting it with the second line segment, it helps to achieve a smooth transition, reduce sharp changes in the path, and avoid stress concentration and path mutation. The third connection method uses clear geometric operations (translation, extension, connection) to accurately control the shape and length of the path, ensuring that the cutting path is consistent with the design.

[0144] For example, assume there are two adjacent translated line segments A and B: line segment A: from point A1 to point A2; line segment B: from point B1 to point B2; connect A2 and B1 to get the first line segment L1. Translate L1 such that the distance between the translated L1 and the original intersection point C is a pre-set compensation distance. Assume the translated L1 is L1'. Extend line segment A to get intersection point P1 with L1'. Reverse extend line segment B to get intersection point P2 with L1'. Connect P1 and P2 with a second line segment to form a new connection path.

[0145] Referring to Figure 3 , the embodiment also provides a pipe-cut part cutting system, comprising:

[0146] a numerical control cutting device and a controller;

[0147] the controller controls the data cutting device to cut the part to be cut according to the pipe-cut part cutting method as described in embodiment one.

[0148] For example, assume there is a production workshop that needs to cut a batch of pipe parts:

[0149] The operator imports the three-dimensional model of the part to be cut into the controller.

[0150] The controller first unfolds the three-dimensional path to a two-dimensional plane, performs compensation processing, and then re-wraps the compensated path back to the three-dimensional model according to the cutting method described in Example One.

[0151] Then, the controller sends the processed final three-dimensional cutting path to the numerical control cutting equipment.

[0152] The numerical control cutting equipment accurately cuts the pipe according to the controller's instructions, completing the processing of the part.

[0153] The pipe cutting part cutting system in this embodiment realizes high-precision and high-efficiency pipe cutting by combining numerical control cutting equipment and intelligent controllers. The system can automatically process complex cutting paths and compensation strategies to ensure that the quality and size of the final part meet the design requirements. The automated cutting process not only improves production efficiency, but also reduces human error and labor costs.

[0154] The controller in the pipe cutting part cutting system in this embodiment automatically obtains the three-dimensional model of the part to be cut through computer-aided design (CAD) software, then cuts the three-dimensional model along the axial direction and unfolds it into a two-dimensional plane. This process is automatically executed by an algorithm, converting the three-dimensional path into a corresponding two-dimensional path.

[0155] The controller of the pipe cutting part cutting system in this embodiment adjusts the two-dimensional path according to the pre-set compensation strategy. The compensation strategy takes into account cutting errors to ensure the accuracy of the cutting path. Then, according to the direction and angle of each two-dimensional path segment, it is translated to automatically generate a compensated two-dimensional path.

[0156] The controller automatically connects the translated path segments to ensure the continuity and smoothness of the path. The compensated two-dimensional path is re-wrapped onto the three-dimensional model to generate the final three-dimensional cutting path.

[0157] The numerical control cutting equipment automatically cuts according to the generated final three-dimensional cutting path to obtain an accurate cutting part.

[0158] Traditional manual methods cannot accurately control the cutting path of complex geometric shapes, and are prone to errors. In this embodiment, the controller generates and compensates the cutting path, solving the problem of low precision of manual operation. And through the pipe cutting part cutting system (automated system), human intervention is reduced, improving cutting efficiency and precision.

[0159] The embodiment can automatically adjust the cutting path through the compensation strategy, avoid errors in the cutting process, and improve the cutting precision. The automatic path generation and numerical control cutting process greatly improve the production efficiency and adapt to the needs of mass production.

[0160] The pipe cutting part cutting system in the embodiment automatically performs all key steps, avoids errors that may be introduced by manual operation, and ensures the consistency and quality of each cutting part.

[0161] In the embodiment, the numerical control cutting equipment automatically performs the cutting process according to the pre-set program without manual intervention.

[0162] In the embodiment, complex geometric and mathematical operations such as path translation, angle calculation and path connection are all accurately processed by the controller. That is, the embodiment realizes high-precision and high-efficiency pipe cutting part cutting through automatic calculation and equipment control. It solves the technical problems in traditional manual operation and achieves remarkable technical effects.

[0163] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0164] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0165] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature, can be directly above or obliquely above the first feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature, can be directly below or obliquely below the first feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0166] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0167] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can modify, modify, replace and modify the above-described embodiments within the scope of the present application.

Claims

1. A pipe cutting method of cutting a pipe fitting, characterized by, Comprising, S1, obtaining a three-dimensional model of a part to be cut, and based on the three-dimensional model of the part to be cut, obtaining a first two-dimensional plane corresponding to the part to be cut; The three-dimensional model of the part to be cut includes an initial three-dimensional cutting path of the port of the part to be cut; The part to be cut is a tubular part; The first two-dimensional plane corresponding to the part to be cut is a plane obtained by cutting the part to be cut along the axial direction and unfolding the surface of the part to be cut onto a two-dimensional plane; Wherein, the first two-dimensional plane includes a two-dimensional plane path corresponding to the initial three-dimensional cutting path unfolded onto the two-dimensional plane; S2, based on the two-dimensional plane path and the axial direction of the part to be cut, using a pre-set compensation strategy to compensate the two-dimensional plane path, obtaining a compensated two-dimensional plane path, and wrapping the compensated two-dimensional plane path onto the part to be cut, obtaining a final three-dimensional cutting path of the port of the part to be cut; S3, cutting the part to be cut according to the final three-dimensional cutting path to obtain a cut part; The S1 specifically includes: Based on the three-dimensional model of the part to be cut, obtaining an initial three-dimensional cutting path of the port of the part to be cut, and discretizing the initial three-dimensional cutting path into a contour line; Based on the contour line, obtaining a line in a two-dimensional graph corresponding to the contour line in the first two-dimensional plane; The initial three-dimensional cutting path includes a plurality of cutting line segments with cutting directions connected in sequence according to the cutting order; Wherein, the two-dimensional plane path corresponding to the initial three-dimensional cutting path is the line in the two-dimensional graph corresponding to the contour line; The S2 specifically includes: S21, based on the pipe stretching direction and the unfolding direction of the contour line, according to the pre-set translation strategy, each line segment in the line in the two-dimensional graph is translated respectively to obtain a translated line segment; Wherein, the pipe stretching direction is the axial direction of the part to be cut; The unfolding direction of the contour line is a direction perpendicular to the axial direction of the part to be cut; The translation strategy specifically includes: When the cutting direction of any line segment in the line in the two-dimensional graph and the contour line unfolding direction form an angle greater than or equal to -45° and less than 45°, the line segment is translated in the pipe stretching direction as the translation direction by a pre-set compensation distance; When the cutting direction of any line segment in the line in the two-dimensional graph and the contour line unfolding direction form an angle greater than or equal to 45° and less than 135°, the line segment is translated in the opposite direction of the contour line unfolding direction as the translation direction by a pre-set compensation distance; When the cutting direction of any line segment in the line in the two-dimensional graph and the contour line unfolding direction form an angle greater than or equal to 135° or less than -135°, the line segment is translated in the opposite direction of the pipe stretching direction as the translation direction by a pre-set compensation distance; When the cutting direction of any line segment in the line in the two-dimensional graph and the contour line unfolding direction form an angle greater than or equal to -135° and less than -45°, the line segment is translated in the contour line unfolding direction as the translation direction by a pre-set compensation distance; S22, connecting the translated line segments according to the cutting sequence to obtain connected translated line segments; S23, when the connected translated line segments meet a pre-set condition, covering the connected translated line segments in the two-dimensional graph of the part to be cut onto the part to be cut to obtain a final three-dimensional cutting path of the port of the part to be cut.

2. The pipe part cutting method according to claim 1, wherein the pre-set condition is that the first translated line segment and the second translated line segment have no intersection point; the first translated line segment is any translated line segment; the second translated line segment is an adjacent translated line segment after the first translated line segment according to the cutting sequence. The S22 specifically comprises:

3. The pipe cutting part cutting method according to claim 2, wherein S221, in the translated line segments, when the translation directions of any two adjacent translated line segments according to the cutting sequence are consistent, connecting the two adjacent translated line segments; S222, in the translated line segments, when there is an intersection point between any two adjacent translated line segments according to the cutting sequence, deleting the line segment after the intersection point in the first translated line segment of the two adjacent translated line segments, and deleting the line segment before the intersection point in the second translated line segment of the two adjacent translated line segments; S223, in the translated line segments, when there is no intersection point between any two adjacent translated line segments according to the cutting sequence, connecting the two adjacent translated line segments by using the first connection mode, the second connection mode or the third connection mode.

4. The pipe part cutting method according to claim 3, wherein the first connection mode is: connecting the intersection point of the straight lines where the two adjacent translated line segments are located as the connection point of the two adjacent translated line segments.

5. The pipe part cutting method according to claim 4, wherein the second connection mode is: setting a first circular arc at the intersection point of the straight lines where the two adjacent translated line segments are located, so that the first circular arc is tangent to the two adjacent translated line segments respectively; smoothly connecting the tangent point of the first translated line segment and the first circular arc and the tangent point of the second translated line segment and the first circular arc by the first circular arc; the first circular arc is a circular arc with a pre-set compensation distance as a radius.

6. The pipe part cutting method according to claim 5, wherein the third connection mode is: connecting the end point of the first translated line segment and the start point of the second translated line segment to obtain a first line segment; translating the first line segment in a first direction, so that the distance between the translated first line segment and a first intersection point is a pre-set compensation distance; the first direction is from the first intersection point to the first line segment; the first intersection point is the intersection point of the two adjacent translated line segments before translation. ​ ​ ​ ​ The first of the two adjacent translated line segments is extended in the direction from the start point to the end point and intersects the translated first line segment at a first point, and the second of the two adjacent translated line segments is extended in the opposite direction from the end point to the start point and intersects the translated first line segment at a second point, so that the two adjacent translated line segments are connected by means of the second line segment after being extended respectively. The second line segment has two ends respectively at the first point and the second point.

7. A tube cutting part cutting system characterized by, The application relates to a pipe cutting part cutting method and a pipe cutting part cutting device. The application relates to a pipe cutting part cutting method and a pipe cutting part cutting device. The application relates to a pipe cutting part cutting method and a pipe cutting part cutting device.

Images