CN109270890B - Workpiece turning method and turning control system - Google Patents
Workpiece turning method and turning control system Download PDFInfo
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- CN109270890B CN109270890B CN201710587193.9A CN201710587193A CN109270890B CN 109270890 B CN109270890 B CN 109270890B CN 201710587193 A CN201710587193 A CN 201710587193A CN 109270890 B CN109270890 B CN 109270890B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35349—Display part, programmed locus and tool path, traject, dynamic locus
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Abstract
The invention discloses a workpiece turning method and a turning control system, wherein the workpiece turning method comprises the following steps: acquiring a workpiece model; extending from the edge of the workpiece model to the outside of the workpiece model to form an extension part; forming a first new workpiece model by integrating the workpiece model and the extension part; and processing the workpiece according to the first new workpiece model. The workpiece turning method and the turning control system are beneficial to ensuring that the running track is smooth and coherent when a turning tool enters the edge of the workpiece from the outside of the workpiece in the turning process, thereby improving the running efficiency of the turning tool and ensuring the cutting effect.
Description
Technical Field
The invention belongs to the field of turning, and particularly relates to a workpiece turning method and a turning control system.
Background
In the current machining industry, turning is generally performed in a single piece, and as shown in fig. 1, a workpiece 11 is fixed on a turntable 12, and a plurality of tool positions (including a cutting position and a cutting depth) are set on the workpiece 11. The controller controls the rotary table 12 to rotate along the C axis, the turning tool 13 is fed from the edge of the rotary table to the central point of the rotary table along the X axis direction, and meanwhile, the turning tool 13 moves up and down rapidly along the C axis direction to meet the cutting depth when reaching each tool point. Along with the rotation of the turntable 12 and the feeding of the turning tool 13, the turning tool 13 moves up and down rapidly along the C-axis direction, and the turning tool 13 traverses all tool positions to complete the machining. Fig. 2 shows a schematic top view of the turning apparatus and the workpiece during turning, with the workpiece 11 secured to the turning table 12 of the lathe. The movement trajectory of the turning tool 13 during the above-mentioned turning process is referred to as a "cutting trajectory" of the turning tool 13, and a projection of the "cutting trajectory" on a plane perpendicular to the C axis (i.e., a supporting surface of the rotary table for the workpiece, i.e., a bottom surface of the workpiece) is a spiral line from an outermost edge of the workpiece 11 toward a workpiece center point a (i.e., a rotary table center point), which is referred to as a cutting trajectory projection 111. The processing mode has the following defects: the turning tool is horizontally moved in a virtual machining stroke (i.e., a stroke outside the workpiece), without moving up and down in the C-axis direction. Thus, when a turning tool enters the edge of a workpiece from outside the workpiece, the turning tool often has a large step along the C-axis direction in order to match the cutting height of the tool point at the edge. The arrow in fig. 3 shows the trajectory of the turning tool as it approaches the edge of the workpiece 11 and the above-described step change occurs (the dotted line is the target shape 112 of the turning at the edge of the workpiece). The step causes the moving track of the turning tool to be discontinuous. For example, to meet the time for the turning tool to realize a large step change there, the turning tool needs to be temporarily stopped in the X-axis direction, which reduces the efficiency of the turning process and affects the cutting effect.
Disclosure of Invention
The invention aims to solve the technical problems that in the turning process in the prior art, the moving track of a turning tool is discontinuous and the cutting effect is influenced, and provides a workpiece turning method and a turning control system.
The invention solves the technical problems through the following technical scheme: a method of turning a workpiece, the method comprising the steps of:
s1, acquiring a workpiece model;
s2, extending from the edge of the workpiece model to the outside of the workpiece model to form an extension part;
s3, forming a first new workpiece model by integrating the workpiece model and the extension part;
and S4, machining the workpiece according to the first new workpiece model car.
Preferably, the edge of the workpiece model in S2 smoothly transitions to the extension.
Preferably, in S2: and fitting a curved surface expression of a first curved surface, wherein the first curved surface is a curved surface in a first preset range of the edge of the workpiece model, and the first curved surface extends towards the outside of the workpiece model according to the curved surface expression to form an extension part, and the extension part does not exceed a second preset range.
Preferably, S2 comprises the steps of:
s21, setting a plurality of tool positions for the workpiece according to the workpiece model;
s22, fitting a curve expression according to each intersecting curve respectively, or fitting a curve expression according to a plurality of tool positions on each intersecting curve respectively, wherein the intersecting curve is an intersecting line of a curved surface and an expanded tangent plane in a first preset range of the edge of the workpiece model, the expanded tangent plane is a plane which passes through expanded projection rays and is perpendicular to the bottom surface of the workpiece model, the expanded projection rays are rays which start from the center point of the bottom surface of the workpiece model and pass through edge tool position projection points, and the edge tool position projection points are projections of the plurality of tool positions on the bottom surface of the workpiece model;
s23, extending the intersecting curve to the outside of the workpiece according to the curve expression to form an extension curve section, wherein the extension curve section does not exceed a second preset range;
in S4:
the extension curve section is provided with extension curve section tool location points, cutting tracks of a turning tool are arranged, the cutting tracks are connected with all the tool location points and the extension curve section tool location points in a one-way mode, the projection of the cutting tracks is a spiral line tending to the center point of the bottom surface of the workpiece model, and the projection of the cutting tracks is the projection of the cutting tracks on the bottom surface of the workpiece model.
Preferably, S3 further comprises: placing a plurality of first new workpiece models according to a preset position relation, and forming a second new workpiece model by taking the plurality of first new workpiece models as a whole;
s4 comprises the following steps: and machining the workpiece according to the second new workpiece model.
Preferably, the turning control system comprises an arithmetic unit and a control unit;
the operation unit is used for acquiring a workpiece model, extending the edge of the workpiece model to the outside of the workpiece model to form an extension part, and forming a first new workpiece model by integrating the workpiece model and the extension part;
the control unit is used for controlling the lathe to machine the workpiece according to the first new workpiece model.
Preferably, in the first new workpiece model, the edge of the workpiece model smoothly transitions to the extension.
Preferably, the operation unit is configured to fit a curved surface expression of a first curved surface, where the first curved surface is a curved surface within a first preset range of an edge of the workpiece model, and extend the first curved surface to the outside of the workpiece model according to the curved surface expression to form an extension portion, and the extension portion does not exceed a second preset range.
Preferably, the operation unit is configured to set a plurality of tool points for the workpiece according to the workpiece model, and to fit a curve expression according to each intersection curve, or to fit a curve expression according to a plurality of tool points on each intersection curve, respectively, where the intersection curve is an intersection line of a curved surface and an extended tangent plane within a first preset range of an edge of the workpiece model, the extended tangent plane is a plane passing through an extended projection ray and perpendicular to a bottom surface of the workpiece model, the extended projection ray is a ray starting from a center point of the bottom surface of the workpiece model and passing through a projection point of the edge tool point, the projection point of the edge tool point is a projection of the plurality of tool points on the bottom surface of the workpiece model, and according to the curve expression, the intersection curve is extended to the outside of the workpiece to form an extended curve segment, and the extended curve segment does not exceed a second preset range; the arithmetic unit is also used for arranging extended curve segment tool location points on the extended curve segment and arranging extended cutting tracks of the turning tool, wherein the extended cutting tracks are connected with all the tool location points and the extended curve segment tool location points in a one-way mode, the extended cutting tracks are projected to be spiral lines tending to the central point of the bottom surface of the workpiece model, and the extended cutting tracks are projected to be projections of the extended cutting tracks on the bottom surface of the workpiece model.
Preferably, the arithmetic unit is further configured to integrate a plurality of first new workpiece models placed according to a preset positional relationship to form a second new workpiece model;
the control unit is used for lathing the workpiece according to the second new workpiece model.
The positive progress effects of the invention are as follows: when the workpiece turning method or the turning control system is used, the running track is smooth and continuous when the turning tool enters the edge of the workpiece from the outside of the workpiece, so that the turning tool running efficiency is improved and the cutting effect is ensured.
Drawings
Fig. 1 is a schematic diagram of a turning device (including a workpiece) in the prior art.
Fig. 2 is a top view of a workpiece and a lathe turntable during a turning process in the prior art.
Fig. 3 is a side view of a workpiece and a lathe turntable, and a moving track of a turning tool when the turning tool enters the edge of the workpiece from the outside of the workpiece in a turning process in the prior art.
Fig. 4 is a schematic structural diagram of a workpiece turning control system according to embodiment 1.
Fig. 5 is a side view of a first new workpiece model formed in example 1.
Fig. 6 is a top view of the first new workpiece model formed in example 1.
Fig. 7 is a flowchart of a workpiece turning method of embodiment 1.
Fig. 8 is a side view of the first new workpiece model formed in example 2.
FIG. 9 is a top view of the first new workpiece model formed in example 2.
Fig. 10 is a flowchart of a workpiece turning method of embodiment 2.
Fig. 11 is a top view of a second new workpiece model formed in example 4.
Fig. 12 is a flowchart of a workpiece turning method of embodiment 4.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a turning control system, as shown in fig. 4, the turning control system includes a computing unit 201 and a control unit 202. The arithmetic unit 201 is used to acquire a workpiece model (in the present invention, a target shape of workpiece turning is referred to as "workpiece model"). The operation unit 201, such as a numerical control device of a numerical control machine tool, or a Computer equipped with engineering drawing software such as CAD (Computer Aided Design) or graphics and image processing software, may be used to obtain a workpiece model. As shown in fig. 5, the arithmetic unit 201 is also configured to form the extension 103 by extending the edge 102 of the workpiece model to the outside of the workpiece model 101, and to form the first new workpiece model 104 by integrating the workpiece model 101 and the extension 103. Preferably, in the first new workpiece model 104, the edge 102 of the workpiece model smoothly transitions to the extension 103.
As a preferred embodiment, the operation unit 201 of the turning control system of the present embodiment is configured to fit a surface expression of a first curved surface, where the first curved surface is a curved surface within a first preset range of an edge of the workpiece model. The first preset range may be defined in terms of size, for example, a range not exceeding 5mm near the edge of the workpiece model is set as the first preset range; the first preset range may also be defined in proportion, for example, the ratio of the difference between the inner and outer diameter sizes of the projection of the curved surface of the workpiece model at the edge on the bottom surface of the workpiece model to the diameter size of the workpiece model is in the range of 0.2% to 20%. As shown in FIG. 6, the outer diameter R of the projection of the curved surface at the edge of the workpiece model on the bottom surface of the workpiece model 2 Inner diameter R of projection of curved surface at edge of workpiece model on bottom surface of workpiece model 1 The difference value of (A) is the size difference D of the inner diameter and the outer diameter of the projection of the curved surface at the edge of the workpiece model on the bottom surface of the workpiece model 1 The difference D between the inner and outer diameters 1 The outer diameter R of the projection of the workpiece model and the size of the workpiece (namely, the curved surface at the edge of the workpiece model on the bottom surface of the workpiece model) 2 ) The range of the ratio of (A) is 0.2 to 20%. In the workpiece model, the shapes of the curved surfaces at the surface and the edge of the workpiece model are often greatly different, and the reference significance of the surface to the outward extension of the edge of the workpiece model is not large; in addition, the external extension is performed only according to the curved surface shape at the edge of the workpiece model, so that the accuracy of the external extension is ensured, the calculation amount of a software program is reduced, and the efficiency is improved. Therefore, the first preset range is set, and better effect and efficiency can be achieved.
Further, the extension does not exceed a second preset range. Similar to the first preset range, the second preset range may be defined in terms of size or may be defined in terms of scale. Considering the cost consumed by externally extending to generate the extension part, the cost consumed by arranging the tool location point and the cutting track after the extension part is generated, and the complexity of the turning tool for completing the corresponding cutting track, preferably, the size difference of the inner diameter and the outer diameter of the projection of the extension part on the bottom surface of the workpiece model and the diameter of the workpieceThe size ratio ranges from 0.5% to 40%. As shown in FIG. 6, the outer diameter R of the projection of the work extension on the bottom surface of the work model 3 Inner diameter of projection of the workpiece extending part on the bottom surface of the workpiece model (i.e. outer diameter R of projection of curved surface at edge of the workpiece model on the bottom surface of the workpiece model) 2 ) The difference value of (A) is the size difference D of the inner diameter and the outer diameter of the projection of the extension part on the bottom surface of the workpiece model 2 The difference D between the inner and outer diameters 2 The diameter dimension of the workpiece (namely the outer diameter R of the projection of the curved surface at the edge of the workpiece model on the bottom surface of the workpiece model) 2 ) The range of the ratio of (A) is 0.5 to 40 percent. The second preset range is set according to the ratio range, so that better effect and efficiency can be achieved.
The control unit 202 is used for controlling the lathe to lathe the workpiece according to the first new workpiece model. The control unit 202, such as a numerical control device of a numerical control machine tool, generates the tool location point 105 for the first new workpiece model, sets the cutting trajectory of the turning tool, and then controls the lathe to complete the turning process.
Because extended extension portion in the outside of work piece model, in the car course of working, before the lathe tool arrived the work piece from the work piece outside, can carry out virtual processing action to virtual extension portion, the lathe tool produces the motion in C axle (vertical) direction according to the virtual tool location point and the cutting orbit that extension portion set up in extension portion region promptly. Because the extension part is obtained by expanding and extending according to the shape (such as a curved surface and a curve) of the edge of the workpiece model, the edge of the workpiece model and the extension part are in smooth transition. Therefore, when the turning tool reaches the edge of the workpiece from the extension part, the large longitudinal step cannot be generated, and the running track of the turning tool is smooth and continuous. The application of the turning control system of the embodiment improves the turning operation efficiency and ensures the cutting effect.
The present embodiment also provides a workpiece turning control method, as shown in fig. 7, the workpiece turning method including the following steps (a side view of a first new workpiece model formed by the turning method according to the present embodiment is shown in fig. 5):
and S1001, acquiring the workpiece model 101. For example, a workpiece model is obtained using a numerical control device of a numerical control machine tool, or a computer having engineering drawing software such as CAD, graphics, or image processing software.
S1002, the extension 103 is formed by extending the edge 102 of the workpiece model to the outside of the workpiece model 101. For example, the extension 103 is formed by extending the edge 102 of the workpiece model outward from the workpiece model 101 according to the curved surface of the edge 102 of the workpiece model. Preferably, the edge 102 of the workpiece model transitions smoothly to the extension 103.
As a preferred embodiment, in step S1002, a surface expression of a first surface is fitted, where the first surface is a surface within a first preset range of the edge of the workpiece model. The first preset range may be defined in terms of size or may be defined in terms of scale. Further, the extension does not exceed a second preset range. Similar to the first preset range, the second preset range may be defined in terms of size or may be defined in terms of scale.
S1003 forms a first new workpiece model 104 by integrating the workpiece model 101 and the extension 103.
And S1004, turning the workpiece according to the first new workpiece model 104. For example, the numerical control device of the numerical control machine tool is used to generate the tool location point 105 for the first new workpiece model, and set the cutting track of the turning tool, and then control the turning machine to finish the turning process.
Example 2
The turning control system of this embodiment is substantially the same as the turning control system of embodiment 1, except that, as shown in fig. 8, the operation unit 201 is configured to set a plurality of tool points 105 for a workpiece according to a workpiece model, and fit a curve expression according to each intersection curve 115, where the intersection curve 115 is an intersection line of a curved surface and an expanded tangent plane within a first preset range of an edge of the workpiece model, as shown in fig. 9, the expanded tangent plane is a plane passing through an expanded projection ray 114 and perpendicular to a bottom surface of the workpiece model, the expanded projection ray 114 is a ray starting from a bottom surface center point a of the workpiece model and passing through an edge tool point projection point 113, and the edge tool point projection point 113 is a projection of the plurality of tool points 105 on the bottom surface of the workpiece model. The operation unit 201 is further configured to extend the intersection curve 115 to the outside of the workpiece according to the curve expression to form an extended curve segment 116, where the extended curve segment 116 does not exceed a second preset range. The operation unit 201 is further configured to set an extension curve segment tool location point 117 on the extension curve segment 116, and set an extension cutting trajectory of the turning tool, where the extension cutting trajectory is unidirectionally connected to all the tool location points 105 and the extension curve segment tool location point 117, the projection of the extension cutting trajectory is a spiral line that tends to the center point of the bottom surface of the workpiece model, and the projection of the extension cutting trajectory is a projection of the extension cutting trajectory on the bottom surface of the workpiece model.
The present embodiment also provides a workpiece turning method, as shown in fig. 10, which includes the following steps (a side view of the first new workpiece model formed by the turning method according to the present embodiment is shown in fig. 5, and a top view of the first new workpiece model formed by the turning method according to the present embodiment is shown in fig. 6):
s2001, acquiring the workpiece model 101.
And S2002, setting a plurality of tool positions 105 for the workpiece according to the workpiece model 101.
S2003, fitting a curve expression according to each intersection curve 115, where the intersection curve 115 is an intersection line between a curved surface and an expanded tangent plane within a first preset range of an edge of the workpiece model, as shown in fig. 9, the expanded tangent plane is a plane passing through an expanded projection ray 114 and perpendicular to the bottom surface of the workpiece model, the expanded projection ray 114 is a ray starting from a bottom surface center point a of the workpiece model and passing through an edge tool point projection point 113, and the edge tool point projection point 113 is a projection of the plurality of tool points 105 on the bottom surface of the workpiece model.
As a preferred embodiment, the curve expression is a 3 rd order polynomial, i.e., in S2003, a 3 rd order polynomial is fitted to each of the intersecting curves 115, respectively. The fitting mode not only ensures the precision, but also avoids the resource and time cost consumed by fitting higher-order (also more complex) polynomials.
And S2004, extending the intersection curve 115 to the outside of the workpiece according to the curve expression to form an extension curve section 116, wherein the extension curve section 116 does not exceed a second preset range.
S2005, the workpiece model 101 and the extension curve segment 116 are integrated to form a first new workpiece model.
And S2006, arranging extension curve segment tool location points 117 on the extension curve segment 116, and arranging extension cutting tracks of the turning tool, wherein the extension cutting tracks are connected with all the tool location points 105 and the extension curve segment tool location points 117 in a one-way mode, the projection of the extension cutting tracks is a spiral line which tends to the central point of the bottom surface of the workpiece model, and the projection of the extension cutting tracks is the projection of the extension cutting tracks on the bottom surface of the workpiece model.
And S2007, controlling the turning tool and the rotary table, and performing machining on the workpiece according to the expanded cutting track.
Example 3
The turning control system of the present embodiment is substantially the same as that of embodiment 2, except that, as shown in fig. 8, an arithmetic unit 201 fits a curve expression to the plurality of tool positions 105 on each of the intersecting curves 115, respectively. The coordinate values of the cutter location points 105 are stored in the operation unit, so that the time for obtaining the cutter location points again is saved; in addition, the number of numerical values (namely, the number of reference points) referred to by fitting can be effectively controlled by using the set tool location point 105 fitting curve expression, so that the fitting process is ensured to meet the accuracy, the complexity of fitting operation is reduced, the efficiency is improved, and the cost is reduced.
The present embodiment also provides a workpiece turning method that is different from the workpiece turning method of embodiment 2 in that, in step S2002, curve expressions are fitted respectively according to the plurality of tool positions 105 on each of the intersecting curves 115.
Example 4
The turning control system of the present embodiment is basically the same as the turning control systems of the 3 previous embodiments, except that, as shown in fig. 11, the arithmetic unit 201 is further configured to form the first new workpiece model 104 by integrating the workpiece model and the extension portion, and form the second new workpiece model 118 by integrating a plurality of first new workpiece models arranged in a predetermined positional relationship. Preferably, the predetermined positional relationship is as follows: any 2 first new workpiece models are not overlapped; for another example: the plurality of first new workpiece models are uniformly distributed along a circular circumferential direction (for example, when the plurality of first new workpiece models are arranged on the rotary table of the lathe, the plurality of first new workpiece models are uniformly distributed along the circumferential direction of the rotary table).
The control unit 202 is adapted to machine the workpiece according to the second new workpiece model 118. For example, the numerical control apparatus of the numerical control machine tool sets tool positions for a plurality of workpieces according to the second new workpiece model 118 and sets cutting trajectories of the turning tools. And fixing a plurality of workpieces on a rotary table of the numerical control lathe according to a preset position relation, controlling the turning tool and the rotary table by using a numerical control device of the numerical control lathe, and turning the workpieces according to the cutting track, so that the plurality of workpieces can be simultaneously machined. In the turning process in the prior art, a single workpiece is arranged on a lathe turntable for processing. In the cutting track of the turning tool, a large part is processed in a virtual mode, namely the turning tool cannot cut a workpiece, so that the ratio of an actual processing path (i.e. the path through which the turning tool cuts the workpiece) to a total processing path is low, namely the effective cutting efficiency is low. In the embodiment, the mode of simultaneously processing a plurality of workpieces is adopted, so that the proportion of virtual processing paths can be reduced, and the effective cutting efficiency is improved.
The present embodiment further provides a workpiece turning method, as shown in fig. 12, the turning method is different from the turning methods in the foregoing 3 embodiments in that the turning method of the present embodiment includes: step S4031 is performed after the first new workpiece model is formed (a plan view of the second new workpiece model formed by the turning method according to the present embodiment is shown in fig. 11):
s4031: the plurality of first new workpiece models 104 are arranged in a predetermined positional relationship, and the plurality of first new workpiece models 104 are integrated to form a second new workpiece model 118.
The workpiece turning method of the present embodiment includes step S4004:
s4004, turning the workpiece according to the second new workpiece model 118.
While specific embodiments of the invention have been described above, it will be understood by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (8)
1. A workpiece turning method, characterized by comprising the steps of:
s1, acquiring a workpiece model;
s2, extending from the edge of the workpiece model to the outside of the workpiece model to form an extension part;
s3, forming a first new workpiece model by integrating the workpiece model and the extension part;
s4, processing the workpiece according to the first new workpiece model car;
s2 comprises the following steps:
s21, setting a plurality of tool positions for the workpiece according to the workpiece model;
s22, fitting a curve expression according to each intersecting curve respectively, or fitting a curve expression according to a plurality of tool positions on each intersecting curve respectively, wherein the intersecting curve is an intersecting line of a curved surface and an expanded tangent plane in a first preset range of the edge of the workpiece model, the expanded tangent plane is a plane which passes through expanded projection rays and is perpendicular to the bottom surface of the workpiece model, the expanded projection rays are rays which start from the center point of the bottom surface of the workpiece model and pass through edge tool position projection points, and the edge tool position projection points are projections of the plurality of tool positions on the bottom surface of the workpiece model;
s23, extending the intersecting curve to the outside of the workpiece according to the curve expression to form an extension curve section, wherein the extension curve section does not exceed a second preset range;
in S4:
the extension curve section is provided with extension curve section tool location points, cutting tracks of a turning tool are arranged, the cutting tracks are connected with all the tool location points and the extension curve section tool location points in a one-way mode, the projection of the cutting tracks is a spiral line tending to the center point of the bottom surface of the workpiece model, and the projection of the cutting tracks is the projection of the cutting tracks on the bottom surface of the workpiece model.
2. The method of claim 1, wherein the edges of the workpiece model in S2 smoothly transition to the extensions.
3. The workpiece turning method according to claim 1, wherein in S2: and fitting a curved surface expression of a first curved surface, wherein the first curved surface is a curved surface in a first preset range of the edge of the workpiece model, and the first curved surface extends towards the outside of the workpiece model according to the curved surface expression to form an extension part, and the extension part does not exceed a second preset range.
4. The method of turning a workpiece as defined in claim 1, wherein S3 further comprises: placing a plurality of first new workpiece models according to a preset position relation, and forming a second new workpiece model by taking the plurality of first new workpiece models as a whole;
s4 comprises the following steps: and machining the workpiece according to the second new workpiece model.
5. A turning control system is characterized by comprising an arithmetic unit and a control unit;
the operation unit is used for acquiring a workpiece model, extending the edge of the workpiece model to the outside of the workpiece model to form an extension part, and forming a first new workpiece model by integrating the workpiece model and the extension part;
the control unit is used for controlling the lathe to lathe the workpiece according to the first new workpiece model;
the operation unit is used for setting a plurality of tool positions for the workpiece according to the workpiece model, fitting a curve expression according to each intersecting curve respectively, or fitting a curve expression according to a plurality of tool positions on each intersecting curve respectively, wherein the intersecting curve is an intersecting line of a curved surface and an expanded tangent plane in a first preset range of the edge of the workpiece model, the expanded tangent plane is a plane which passes through an expanded projection ray and is perpendicular to the bottom surface of the workpiece model, the expanded projection ray is a ray which starts from the center point of the bottom surface of the workpiece model and passes through the projection point of the edge tool position, the projection point of the edge tool position is the projection of the tool positions on the bottom surface of the workpiece model, the intersecting curve extends towards the outside of the workpiece according to the curve expression to form an expanded curve section, and the expanded curve section does not exceed a second preset range; the arithmetic unit is further used for setting extension curve segment tool location points on the extension curve segment and setting an extended cutting track of the turning tool, wherein the extended cutting track is connected with all the tool location points and the extension curve segment tool location points in a one-way mode, the extended cutting track is projected to be a spiral line tending to the central point of the bottom surface of the workpiece model, and the extended cutting track is projected to be the projection of the extended cutting track on the bottom surface of the workpiece model.
6. The machining control system of claim 5, wherein in the first new workpiece model, the edges of the workpiece model smoothly transition to the extension.
7. The machining control system according to claim 5, wherein the arithmetic unit is configured to fit a curved surface expression of a first curved surface, the first curved surface being a curved surface within a first preset range of an edge of the workpiece model, and extend the first curved surface to an outside of the workpiece model according to the curved surface expression to form an extension portion, the extension portion not exceeding a second preset range.
8. The machining control system according to claim 5, wherein the arithmetic unit is further configured to integrate a plurality of first new workpiece models placed in accordance with a preset positional relationship to form a second new workpiece model;
the control unit is used for processing the workpiece according to the second new workpiece model car.
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| CN102689238A (en) * | 2011-02-24 | 2012-09-26 | 苹果公司 | Smart automation of robotic surface finishing |
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| JP2001150256A (en) * | 1999-11-29 | 2001-06-05 | Olympus Optical Co Ltd | Composite machining method for workpiece |
| CN1569375A (en) * | 2003-03-12 | 2005-01-26 | 发那科株式会社 | Method and apparatus for preparing program for die machining |
| CN101058966A (en) * | 2006-04-21 | 2007-10-24 | 上海颉灏机械有限公司 | Embedded sleeve for concrete switch tie and preparation method for screw shell thereof |
| CN102689238A (en) * | 2011-02-24 | 2012-09-26 | 苹果公司 | Smart automation of robotic surface finishing |
| CN106079196A (en) * | 2016-06-23 | 2016-11-09 | 凌云光技术集团有限责任公司 | A kind of generation method and device of burr cutting path |
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