CN112099434A - Contour numerical control milling method and system - Google Patents
Contour numerical control milling method and system Download PDFInfo
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- CN112099434A CN112099434A CN202010996375.3A CN202010996375A CN112099434A CN 112099434 A CN112099434 A CN 112099434A CN 202010996375 A CN202010996375 A CN 202010996375A CN 112099434 A CN112099434 A CN 112099434A
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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
Abstract
The invention relates to a contour numerical control milling method and a system, comprising the following steps: restoring the shape of the outline of the part to be processed; splitting the outline of the part to be processed into a plurality of regular simple outlines, and programming the simple outlines respectively; and carrying out numerical control milling on each programmed simple profile. The invention has simple calculation and can easily and quickly carry out numerical control milling.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a contour numerical control milling method and a contour numerical control milling system.
Background
In the numerical control milling process, the processing process of parts needs to be programmed, one important thing in the programming process is to determine the processing sequence and the feeding route of the parts, and if some parts with complex shapes, especially parts with shapes with more geometric element combinations are manually programmed according to nodes processed by the graph, the calculation of each node is complex and difficult, and some nodes also need to obtain the coordinate values of the nodes through the calculation of angles or trigonometric functions in a complicated way according to the sizes marked on the graph.
In addition, in the programming, a model of the workpiece is established through software, and then a program is exported to a part to be machined through a post-processing function of the software, although the automatic programming is simpler than the manual programming, a numerical control machining person is required to be familiar with application-related software, and not all parts are suitable for modeling and automatic programming through the software, particularly when a plane workpiece is machined, the automatic programming of the software sometimes takes longer than the manual programming.
The existing numerical control milling programming of the plane workpiece, whether manual programming or software modeling automatic programming, determines a processing feed route according to the outline shape of the part, and the numerical control milling program is programmed, so that the coordinate value of each node on the part needs to be calculated. For parts with complex shapes, particularly for nodes intersected by arcs, the calculation of the coordinates of the nodes is complex during manual programming, and a processing person needs to have certain knowledge and technical level.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the difficulty in calculating the node coordinates during manual programming, and provide a numerical control milling method and system capable of processing a complex plane workpiece without calculating the node coordinates.
In order to solve the technical problem, the invention provides a contour numerical control milling method, which comprises the following steps: restoring the shape of the outline of the part to be processed; splitting the outline of the part to be processed into a plurality of regular simple outlines, and programming the simple outlines respectively; and carrying out numerical control milling on each programmed simple profile.
In an embodiment of the invention, when each programmed simple contour is subjected to numerical control milling, the programs of the simple contours are connected according to the requirement of numerical control milling, and then the contour is subjected to numerical control milling.
In one embodiment of the invention, the profile of the part to be machined comprises an inner profile and/or an outer profile.
In one embodiment of the invention, the method for restoring the shape of the contour of the part to be machined comprises the following steps: for a U-shaped inner contour part connected with a semicircle, extending two U-shaped arms of a U-shaped graph from a node to an outer straight line to a certain point, wherein the Y coordinate value of the point is an integer, and connecting the two extended arms to form a first simple contour; and for the semi-circle figure, two nodes at the arc are extended and connected according to an arc line to form a second simple outline.
In one embodiment of the invention, the second simple contour is a circle.
In one embodiment of the invention, the method for restoring the shape of the contour of the part to be machined comprises the following steps: for an inner and outer contour part with a step area and a cavity, a node on a connecting area between the step area and the cavity extends outwards to a certain point in a straight line in sequence, the Y coordinate value of the point is an integer, and the two points extending in the same direction are connected to form a third simple contour. Meanwhile, the broken arc outer contour of the step area extends and connects into a full circle at the node according to an arc shape to form a fourth simple contour, and the broken arc inner contour of the cavity area extends and connects into a full circle at the node according to an arc shape to form a fifth simple contour.
In one embodiment of the invention, the third simple contour is a square, and the fourth and fifth simple contours are circles.
In one embodiment of the invention, the method for restoring the shape of the contour of the part to be machined comprises the following steps: for a cavity workpiece with the center formed by combining circular arcs, all nodes on the circular arcs are sequentially connected in sequence to form a seventh simple profile located at the center and a plurality of eighth simple profiles located at the edges.
In one embodiment of the invention, the seventh simple contour and the eighth simple contour are both circular.
The invention also provides a contour numerical control milling system, which comprises: the restoration module is used for restoring the shape of the outline of the part to be processed; the programming module is used for splitting the outline of the part to be processed into a plurality of regular simple outlines and respectively programming the simple outlines; and the processing module is used for carrying out numerical control milling processing on each programmed simple contour.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the contour numerical control milling method and the contour numerical control milling system, the shape of the contour of the part to be processed is restored, so that programming is facilitated, and complicated node coordinate calculation is avoided; the method comprises the following steps of splitting the outline of a part to be processed into a plurality of regular simple outlines, and programming the simple outlines respectively, wherein due to the simple programming of the regular simple outlines, operators can program and process the small paths of each simple shape only by knowing related basic courses, so that the processing procedures of the simple shapes are very simple and easy to manually compile; and each programmed simple contour is subjected to numerical control milling processing, so that the processing of the part to be processed can be easily and quickly realized.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a flow chart of a contour NC milling method according to the present invention;
FIG. 2 is a schematic view of the U-shaped inner profile component of the present invention connected to a semicircle;
FIG. 3 is a first illustration of the invention after partial part restoration of a U-shaped inner profile part associated with a semicircle;
FIG. 4 is a second illustration of the invention after partial part restoration of a U-shaped inner profile part associated with a semicircle;
FIG. 5 is a schematic view of the inner and outer profile components of the present invention having a stepped region and a cavity;
FIG. 6 is a schematic view of the inner profile components of the present invention assembled by circular arcs.
Description of the drawings: 11-a first inner circular profile, 12-a U-shaped inner profile, 21-a stepped region, 22-a cavity, 23-a connecting region, 24-a square outer profile, 25-a second inner circular profile, 26-an outer circular profile.
Detailed Description
Example one
As shown in fig. 1, the present embodiment provides a contour numerical control milling method, including the following steps: step S1: restoring the shape of the outline of the part to be processed; step S2: splitting the outline of the part to be processed into a plurality of regular simple outlines, and programming the simple outlines respectively; step S3: and carrying out numerical control milling on each programmed simple profile.
In the contour numerical control milling method of this embodiment, in step S1, the shape of the contour of the part to be processed is restored, thereby facilitating programming and avoiding tedious calculation; in the step S2, the contour of the part to be processed is split into a plurality of regular simple contours, and the simple contours are programmed respectively, because the programming of the regular simple contours is simple, an operator only needs to know the relevant basic courses to program and process the small paths of each simple shape, so that the processing procedures of the simple shapes are very simple and easy to manually compile; in the step S3, each programmed simple contour is subjected to numerical control milling, so that numerical control milling can be easily and quickly performed to realize processing of the part to be processed.
In this embodiment, before step S1, the workpiece graph is analyzed, and the shape of the profile of the part to be processed is restored according to the workpiece graph, which is beneficial to restoring the complex profile of the part to be processed into a combination of simple shape profiles, and can avoid the complex calculation of the node coordinates during programming.
When the programmed simple profiles are subjected to numerical control milling, the programs of the simple profiles can be arranged and connected into a program according to the requirements of numerical control machining for machining, the programs of the simple profiles can also be independently used as a program for machining, and after all the simple profiles are machined, the machining of the parts to be machined is realized.
The contour of the part to be machined comprises an inner contour and/or an outer contour, and numerical control milling machining can be carried out.
The following is described in detail with reference to specific examples:
as shown in fig. 2, the first pattern inner contour is formed by a combination of a circular arc groove and a U-shaped groove. When a numerically controlled manual program mills the internal contour of the part, conventional methods require knowledge of the coordinates of point A, B, C, D in the internal contour. In a coordinate system taking the point O as a coordinate origin, the coordinate values of the point B, C are easy to calculate according to the dimension marks on the graph, the coordinate values of the point A, D are calculated by using the Pythagorean theorem of a right triangle, the calculation is complicated, a corresponding knowledge level is required, and the processing dimension of the part is directly made wrong and is waste products if the calculation is wrong. If the program is automatically programmed by software, a graph of the inner contour needs to be drawn or an inner contour model needs to be established on related application software, then a cutter and various cutting parameters are set, and then the post-processing function of the software is utilized to derive the machining program of the inner contour.
In the embodiment, for a U-shaped part connected with a semicircle, two U-shaped arms of a U-shaped graph extend to a certain point from a node to an outward straight line, the Y coordinate value of the point is an integer, and the two extended arms are connected to form a first simple outline; and for the semi-circle figure, two nodes at the arc are extended and connected according to an arc line to form a second simple outline.
Specifically, as shown in fig. 3, a line BA extends upward to a point F, and a Y coordinate value of the point F is an integer; extending the CD straight line upwards to a point E, wherein the Y coordinate value of the point E is an integer; the junction E, F is shaped as a U-shaped inner contour 12 at the lower portion of fig. 3, which is the first simplified contour. Similarly, the arc a and D are extended and connected by the arc line to form the upper part shape as shown in fig. 4, which is a first inner circle contour 11, i.e. a second simple contour.
In the above case, after the inner contour of the U-shaped part connected to the semicircle is restored, it is seen that the inner contour is formed by intersecting the first inner contour 11 and the U-shaped inner contour 12, so that the programmed processing of the inner contour can be split into two parts, that is, the processing route of the U-shaped inner contour 12 and the processing route of the first inner contour 11. As shown in fig. 3, the processing route of the U-shaped inner contour 12 is very easy and simple in manual programming because the X coordinate values of the points E and F are given by graphic marks, the Y coordinate values are integers, and the coordinate values of other nodes on the contour are given by graphic marks; similarly, the processing programming of the first inner circle outline 11 can be easily realized only by using an arc instruction; finally, the outline programs of the two parts are arranged and connected together according to the requirement of numerical control machining to be used as a program for machining, or the program of the outline of each part is independently machined, so that the numerical control milling of the inner outline of the case can be easily realized.
In this case, although manual programming is adopted, the coordinate values of the points a and D of the node are not calculated, and the straight line BA is skillfully extended to an integer point in the Y direction, i.e., point F, and the straight line CD is also extended to an integer point in the Y direction, i.e., point E. And the integral values of the point E and the point F are utilized, so that the programming is facilitated, and the calculation is not needed. The method has the advantages that the small path programming processing of each simple shape is changed after the inner contour path of the same sample case is split, and the processing procedures of the simple shapes are very simple and easy to manually compile; and finally, the simple path programs are combined according to the requirement of numerical control machining, so that the machining of the inner contour can be realized.
As shown in fig. 5, the second is an inner and outer contour pattern having a step area and a cavity, for a part having a step area and a cavity, a node on a connection area 23 located between the step area 21 and the cavity 22 is sequentially extended outward straight to a certain point, a Y coordinate value of the point is an integer, and the connection area forms a third simple contour by connecting two points extended in the same direction. Meanwhile, the broken arc outer contour of the step area extends and connects into a full circle at the node according to an arc shape to form a fourth simple contour, and the broken arc inner contour of the cavity area extends and connects into a full circle at the node according to an arc shape to form a fifth simple contour.
Specifically, the step area 21 and the cavity 22 of the part and the connecting area 23 of the step area 21 and the cavity 22 need to be programmed, and the difficulty of programming is to calculate the coordinate value of the node of the connecting area 23 according to the shape characteristics of the part. By adopting the method for splitting the graph recovery processing route, the workpiece can be split into the processing of the square outer contour 24, the processing of the second inner circle contour 25, the processing of the outer circle contour 26 and the processing of extending the node coordinates of the connecting area 23 to the integer value in the manual programming of the workpiece, so that the processing of the extended inner contour is formed. Wherein, the inner contour formed by the extending connection region 23 node is a third simple contour; the second inner circular contour 25 and the outer circular contour 26 form a fifth simple contour and a fourth simple contour, respectively, and the fifth simple contour and the fourth simple contour are circular; the square outer contour 24 forms a sixth simple contour, which is square; therefore, the contour machining of the four simple figures can easily realize numerical control manual programming machining, and finally, the numerical control milling machining of the whole workpiece can be realized only by combining the machining programs of the four simple contours according to the machining requirements of the workpiece.
As shown in fig. 6, the third pattern is formed by combining arcs, and for the cavity workpiece with the center formed by combining arcs, the nodes on the arcs are sequentially extended according to arc lines and sequentially connected to form a seventh simple profile at the center and a plurality of eighth simple profiles at the edges.
Specifically, a square workpiece is provided with a cavity formed by combining arcs at the center, and when the cavity is milled in a numerical control manner, the traditional manual programming milling process route is as follows: programming along the inner contour path of the cavity, namely, making a process route along the contour path trajectory of A1 → B1 → C1 → D1 → E1 → F1 → G1 → H1 → A1. In the conventional process planning method, the calculation of the coordinate values of the nodes on the inner contour is complicated and difficult.
In this embodiment, a contour restoration method is adopted, and in this case, it can be seen that the inner contour of the cavity to be milled for the workpiece is formed by combining five simple circles, that is, the center diameter is phid3The large circle and the small circle with the radius r at the periphery. When a numerical control milling process of the cavity is formulated, the complex cavity can be milled and split into five simple inner circle cavities, namely the cavities with the diameter phi d3Milling a large inner circle and milling four small inner circles with the radius r. Wherein the seventh and eighth simple contours are both circular. In this way, five simple inner circle milling processes can not be used for calculating each node on the outline of the workpiece, programming of milling the inner circle cavity is simple, programming of the workpiece is simple, efficiency is greatly improved, and in the case, after five inner circle cavities are milled, the workpiece complex cavity shown in figure 6 is naturally formed.
Example two
Based on the same inventive concept, the embodiment provides a contour numerical control milling system, the principle of solving the problems is similar to the contour numerical control milling method, and repeated parts are not repeated.
The embodiment provides a contour numerical control milling system, includes: the restoration module is used for restoring the shape of the outline of the part to be processed; the programming module is used for splitting the outline of the part to be processed into a plurality of regular simple outlines and respectively programming the simple outlines; and the processing module is used for carrying out numerical control milling processing on each programmed simple contour.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A contour numerical control milling method is characterized by comprising the following steps:
step S1: restoring the shape of the outline of the part to be processed;
step S2: splitting the outline of the part to be processed into a plurality of regular simple outlines, and programming the simple outlines respectively;
step S3: and carrying out numerical control milling on each programmed simple profile.
2. The contour numerical control milling machining method according to claim 1, characterized in that: when each programmed simple contour is subjected to numerical control milling, the programs of the simple contours can be connected according to the requirements of numerical control machining, and then the contour is subjected to numerical control milling.
3. The contour numerical control milling machining method according to claim 1, characterized in that: the contour of the part to be machined comprises an inner contour and/or an outer contour.
4. The contour numerical control milling machining method according to claim 1, characterized in that: the method for restoring the shape of the outline of the part to be machined comprises the following steps: for a U-shaped inner contour part connected with a semicircle, extending two U-shaped arms of a U-shaped graph from a node to an outer straight line to a certain point, wherein the Y coordinate value of the point is an integer, and connecting the two extended arms to form a first simple contour; and for the semi-circle figure, two nodes at the arc are extended and connected according to an arc line to form a second simple outline.
5. The contour numerical control milling machining method according to claim 4, characterized in that: the second simple contour is a circle.
6. The contour numerical control milling machining method according to claim 1, characterized in that: the method for restoring the shape of the outline of the part to be machined comprises the following steps: for an inner and outer contour part with a step area and a cavity, extending a node on a connecting area between the step area and the cavity to a certain point in sequence outwards and linearly, wherein the Y coordinate value of the point is an integer, and connecting two points extending in the same direction to form a third simple contour; meanwhile, the broken arc outer contour of the step area extends and connects into a full circle at the node according to an arc shape to form a fourth simple contour, and the broken arc inner contour of the cavity area extends and connects into a full circle at the node according to an arc shape to form a fifth simple contour.
7. The contour numerical control milling machining method according to claim 6, characterized in that: the third simple contour is a square, and the fourth and fifth simple contours are circles.
8. The contour numerical control milling machining method according to claim 1, characterized in that: the method for restoring the shape of the outline of the part to be machined comprises the following steps: for a cavity workpiece with the center formed by combining arcs, all nodes on the arcs sequentially extend and are connected according to the arcs to form a seventh simple contour located at the center and a plurality of eighth simple contours located at the edges.
9. The contour numerical control milling machining method according to claim 8, characterized in that: the seventh simple contour and the eighth simple contour are both circular.
10. A contour numerical control milling system is characterized by comprising:
the restoration module is used for restoring the shape of the outline of the part to be processed;
the programming module is used for splitting the outline of the part to be processed into a plurality of regular simple outlines and respectively programming the simple outlines;
and the processing module is used for carrying out numerical control milling processing on each programmed simple contour.
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| CN108304686A (en) * | 2018-04-24 | 2018-07-20 | 河海大学常州校区 | A kind of adaptive dynamic evolution computational methods of roughing process |
| CN111221296A (en) * | 2020-01-13 | 2020-06-02 | 浙江工业大学 | Tool radius compensation method based on DXF file |
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| JP2000263373A (en) * | 1999-03-17 | 2000-09-26 | Printing Bureau Ministry Of Finance Japan | Engraved line drawing pattern forming body and engraving method |
| CN1862432A (en) * | 2006-06-07 | 2006-11-15 | 东南大学 | Control method of carbon fiber high-precise numerically controlled milling machine |
| CN105549537A (en) * | 2015-12-23 | 2016-05-04 | 上海电机学院 | Assembly parameterization and automation numerical control processing method based on material object scanning |
| CN108304686A (en) * | 2018-04-24 | 2018-07-20 | 河海大学常州校区 | A kind of adaptive dynamic evolution computational methods of roughing process |
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