TW201721317A - Cutting path generation method for conversational controller of CNC machine tool which comprises selecting a two-dimensional drawing sheet file of which data are converted into first and second enclosed curves, and based on which an intermediate enclosed fitting curve is generated to form a band-like curved surface - Google Patents

Abstract

A cutting path generation method according to the present invention comprises: selecting a two-dimensional drawing sheet file, converting data of the two-dimensional drawing sheet file into a plurality of line segments, such that the plurality of line segments are combinable to form at least two enclosed curves, then selecting a first enclosed curve and a second enclosed curve and setting a coplanar first depth of the first enclosed curve and a second coplanar depth of the second enclosed curve, and then generating an intermediate enclosed fitting curve between the first depth and the second depth, and combining the first enclosed curve, the second enclosed curve, and the intermediate enclosed fitting curve to form a band-like curved surface; and generating a cutting path through calculation on the band-like curved surface. Such an interactive controller provides assistance to an operator to supplement a CAM process for machining, saves employment of CAD/CAM programmer, and is applicable to fast, small-volume and diverse production, and may greatly save manufacturing cost.

Description

Cutting path generation method of CNC machine tool dialogue controller

The invention relates to a method for generating a cutting path of a CNC machine tool by using a dialog controller, in particular to a cutting path generation method for forming a 2.5-dimensional or a simple 3-dimensional mold by using a 2-dimensional drawing without writing a CAD/CAM program.

Computer Numeric Control (CNC) machine tools include CNC lathes, CNC milling machines, CNC wire cutting, etc., but the industrial CNC machine tools must be equipped with a dedicated controller to operate precisely, therefore, The CNC machine tool's controller is the brain of the CNC machine tool, and its model is usually marked on the top of the machine screen.

When the CNC machine tool starts machining, the CNC program instructions are sent to the CNC controller for interpretation. After the CNC controller completes the command interpretation, it will pass through the electromechanical system and drive system in the CNC machine tool (for example: servo motor). , ball screw and bearing, optical ruler and its feedback system) to make the action required by the CNC program instructions.

Early CNC controllers only accepted CNC code, Macro or APT to operate, but with the development of PC, PC controllers were developed to develop controllers with Conversational or Parametric controllers. Born, it can be processed without the need to rely on the CNC program to accept the user's input of the parameter values on the workpiece pattern.

The core software components of the PC-Based CNC controller include: operating system (OS), human machine interface (MMI), programmable logic control (PLC), interpreter, motion control, transmission control, etc. The body group includes: industrial computer, I/O board, motion control axis card, data transmission board, analog signal control board, etc. In addition, the servo components include: AC/DC servo drives, motors, stepper motors, and spindle motors.

Due to the development of PC-Based controllers, CNC controllers will be able to be combined with CAD/CAM, network and process monitoring software in the future. In the future, it is expected that there will be intelligent CNC machining machines born in the world, and there are processing machines. There will be multiple developments in intelligence, such as processing intelligence and production intelligence.

Among them, the processing wisdom requires the controller to bear the identification of the workpiece pattern, can arrange different cutting tools for different processing blocks, different multi-tool combination, automatic residual material removal, cutting parameters and processes of different materials. The sequence is scheduled, with complete processing countermeasures and intelligence; communication humanization emphasizes communication functions such as voice, text and video images, can be networked with the production planning and scheduling system, download work orders and processing programs, and the workpiece can be cut on the screen during trial cutting. Observe the processing and check it on your mobile phone.

Production intelligence requires statistical analysis of work data and tool life management, as well as fault alarm display. In the future, the machine can connect to the Internet and troubleshoot. It will be equipped with various miniature sensors to monitor the error caused by cutting force, vibration, thermal deformation, etc., and automatically compensate or adjust the working state of the machine to improve the working accuracy of the machine. And stability.

After the CNC controller enters the high-end Windows-based, the CNC has entered the era of modularization. Just like the mobile phone, various functions will be added continuously. For example, the manufacturer who only used the cutting simulation has already produced it with some machine tools. The machine is synchronized, in addition to the basic tool path simulation, it can also be used to simulate the collision between the tool and the machine or fixture.

The specification table of the CNC machine tool usually indicates which kind of CNC controller is used, but some tool machine manufacturers will list several controllers so that the user can specify which controller to use. Among them, the dialogue controller is more famous, such as Hurco dialogue controller or Fanuc dialogue controller, only for 2.5D shape processing.

In the past ten years, with the development of PCs, the development of PC-Based controllers has spread all over the world, from Siemens' Window-based 840D to HEIDENHAIN iTNC-530 controllers, and the most conservative in recent years. Fanuc also developed the OpenCNC 160i series of controllers. The OS of these PC-Based controllers has evolved from early DOS to the current Windows operating system (WindowsXP or Windows2000), under the open environment of Windows. Smart CAD/CAM will be competing, so the function of dialogue (or parametric) will gradually fall behind.

In addition, the competitors of the dialogue controller are CAD/CAM programming and the open environment of Windows, and the general large-scale mechanical processing factory must employ a special CAD/CAM programmer and cooperate with the operator to CAD. Machining procedures and conditions set by /CAM are machined.

However, for small mechanical processing plants, the general processing personnel are only familiar with the machining conditions of CNC machinery (such as tool table, tool magazine, tool setting, knife parameters), and understand the entire operating sequence (Sequence), therefore, the processing personnel only need to Knowing the machining procedures and conditions, reading the mechanical drawing, without additional CAD programming, only need to supplement the CAM program with the help of the dialogue controller for machining, eliminating the CAD/CAM programmer. Hiring can save a lot of production costs, so the advantage of the dialogue controller is to focus on the rapid and small amount of versatile manufacturing, suitable for making some 2.5D or simple 3D molds.

The main object of the present invention is to provide a method for generating a 2.5-dimensional or simple 3-dimensional mold cutting path by using a dialog controller, thereby allowing the dialog controller to assist the processing personnel to complement the CAM program for machining, eliminating CAD/CAM. The programmer's hiring is suitable for fast and small-scale manufacturing, which can save a lot of production costs.

To achieve the foregoing objective, the method for generating a cutting path of a dialog box controller of a CNC machine tool according to the present invention comprises: selecting a two-dimensional drawing file; converting the data of the two-dimensional drawing file into a plurality of line segments; and combining the plurality of line segments to form at least a two closed curve; a first closed curve and a second closed curve are selected, wherein the first closed curve and the second closed curve may be in contact with each other, or may be in a state of no contact with each other; a first depth of the coplanar plane of the curve and a second depth of the coplanar plane of the second closed curve, wherein the first depth is different from the second depth; and at least one fitting medium is generated between the first depth to the second depth a closed curve in which the coplanar depth of the closed curve in the at least one fitting is different from the first depth and the second depth; combining the first closed curve, the second closed curve and the at least one fitting medium closed curve A strip-shaped surface; calculating the strip-shaped surface to generate a cutting path.

Wherein, the two-dimensional drawing file is in a DXF format, and the strip-shaped curved surface is a 3D curved surface, and the strip-shaped curved surface presents a beveled pocket or a beveled convex island.

In a preferred embodiment, the closed curve in the fitting medium is generated by an equal layer offset manner; and the plurality of line segments includes at least one of a straight line, an arc, and an aggregate line.

The invention is characterized in that through the imported two-dimensional drawing file, the user manually specifies two closed curves through the operation interface, and then sets a majority of the closed curve in the fitting curve between the two closed curve depth differences, thereby forming a 2.5-dimensional shape. Or a simple three-dimensional strip surface, and then a cutting path generated by the dialog controller, which can save the editing time of the CAD/CAM programmer and the editing time of the processing program, and greatly save the production cost.

In order to further clarify and understand the structure, the use and the features of the present invention, the preferred embodiment is described in detail with reference to the following drawings:

Referring to FIG. 1 , the present invention is applied to a dialog controller 1 of a CNC machine tool. The main screen of the dialog controller 1 includes a display area 2 and a plurality of selection functional areas located around the display area 2 . 3. First, the user moves the cursor to the insertion event field 30 to select a new cutting event.

Referring to FIG. 2, when the cutting event is clicked, the selection function area 3 will display a plurality of different cutting type fields, and the cutting type field includes: (position) position field 31, (holes) hole Field 32, (line arc) line arc field 33, (contour) contour field 34, and (pocket) pocket/robe field 35, the user must click on the above-mentioned pocket/pellet field 35, followed by The above display area 2 will display a plurality of different cutting patterns to provide a user selection, and the cutting patterns include: circular pockets, square pockets, irregular pockets, and inclined cone-shaped pocket islands. Subsequently, the user moves the cursor to the position of the inclined cone surface convex island of the display area 2, thereby adding a cutting cone surface pocket convex island event.

Referring to FIG. 3, after the event selection is completed, the user moves the cursor to the input path field 36, and then the user selects the 2D drawing file to be processed, and the dialog controller 1 will Parsing a plurality of line segment patterns in the two-dimensional drawing file, and combining the plurality of line segments to form at least two closed curves, and then displaying, by the display area 2, the processing pattern 20 of the two-dimensional drawing file; subsequent users must arbitrarily Two closed curves in the above-described processing pattern 20 are selected. As shown, the thick solid line of the processing pattern 20 is set as a first closed curve 21, and the thick broken line of the processed pattern 20 is set as the second closed curve 22.

Wherein, the two-dimensional drawing file is in the DXF format, and the plurality of line segments include at least one of a straight line, an arc and an aggregation line, and the type and number of the line segments of the first closed curve 21 may be different from the second closed curve 22 .

Referring to FIG. 4, after selecting the first closed curve 21 and the second closed curve 22, the display area 2 will form a parameter list 23 and an object pattern 24, and the user will sequentially move the cursor to the above parameters. The (D1) first depth field 231 and the (D2) second depth field 232 of the list 23 respectively specify a first depth value of the coplanar plane of the first closed curve 21 and a second plane of the second closed curve 22 a depth value, wherein the first depth is different from the second depth.

Referring to FIG. 5, after the values of the first depth and the second depth are input, the user moves the cursor to the (Rough peck increment) feed amount field 233 of the parameter list 23, and inputs the feed amount. After the value, the first closed curve 21 and the second closed curve 22 will generate at least one fitting medium closed curve 25 in an equidistant offset manner, wherein the coplanar depth of the closed curve 25 in the above fitting medium must be different from The first depth and the second depth are as described above.

Finally, the above-described dialog controller 1 combines the first closed curve 21, the second closed curve 22, and the at least one fitting medium closed curve 25 to produce a strip-shaped curved surface 26; and the strip-shaped curved surface 26 is calculated to generate a Cutting path (not shown). The strip curved surface 26 refers to the set first depth (D1) and the second depth (D2), and is calculated to represent a 3D curved surface of a beveled pocket or a beveled convex island.

Referring to FIG. 6, after inputting the above feed amount value, the user moves the cursor to the (PREVIEW) preview field 37 of the selected function area 3, and the display area 2 converts the strip surface 26 Forming a preview pattern 27 with the data of the cutting path, after confirming the processing preview pattern 27, the user can reset the first depth of the first closed curve 21 and the second second closed curve 22 according to different requirements. The depth is either the feed amount (RK) of the coplanar depth of the closed curve 25 as described above, until it meets the product processing requirements.

Referring to FIG. 7 , it is actually known from the operation of the foregoing dialog controller 1 that the method for generating a cutting path of the present invention mainly includes: selecting a two-dimensional drawing file; converting the data of the two-dimensional drawing file into a plurality of line segments. Combining the plurality of line segments to form at least two closed curves; selecting a first closed curve 21 and a second closed curve 22, wherein the first closed curve 21 and the second closed curve 22 do not contact each other; a first depth of the first closed curve 21 coplanar and a second depth of the second closed curve 22 coplanar, wherein the first depth is different from the second depth; and the first depth to the second depth is generated At least one fitting medium closed curve 25, wherein the at least one fitting medium has a coplanar depth different from the first depth and the second depth; and the first closed curve 21, the second closed curve 22, and at least A fitting medium closed curve 25 combines to produce a strip-shaped curved surface 26; the above-described strip-shaped curved surface 26 is calculated to produce a cutting path.

The above-mentioned embodiments are not intended to limit the scope of the present invention, and various simple modifications and modifications made by those skilled in the art in accordance with the scope of the invention and the description of the invention should still be made without departing from the spirit of the invention. It is included in the scope of the following patent application.

1‧‧‧Dialog controller
2‧‧‧ display area
20‧‧‧Processing patterns
21‧‧‧ first closed curve
22‧‧‧second closed curve
23‧‧‧Parameter list
231‧‧‧First depth field
232‧‧‧Second depth field
233‧‧‧Feeding field
24‧‧‧ object pattern
25‧‧‧Fitting closure curve
26‧‧‧Striped surface
27‧‧‧Process preview pattern
3‧‧‧Select the functional area
30‧‧‧Insert event field
31‧‧‧Piston field
32‧‧‧ hole field
33‧‧‧Line arc field
34‧‧‧ contour field
35‧‧‧ Pocket/Convex Field
36‧‧‧Input path field
37‧‧‧Preview field

Figure 1 is a schematic diagram of the original screen of the dialog controller; Figure 2 is a schematic diagram of the dialog controller inserting and selecting the cutting event; Figure 3 is a schematic diagram of the graphical controller import interface forming two closed curves; Figure 4 is the dialog controller setting Schematic diagram of the first depth and the second depth; FIG. 5 is a schematic diagram of the closed controller setting the closed curve in the dialogue controller; FIG. 6 is a schematic diagram of the dialog controller forming a strip curved surface; FIG. 7 is a flow chart of the cutting path generating method Figure.

Claims (6)

A cutting path generation method for a CNC machine tool dialog controller, comprising: selecting a two-dimensional drawing file; converting the data of the two-dimensional drawing file into a plurality of line segments; combining the plurality of line segments to form at least two closed curves; a first closed curve and a second closed curve; a first depth of the first closed curve coplanar and a second depth of the second closed curve coplanar, wherein the first depth is different from the second depth; And generating at least one fitting median closed curve between the first depth and the second depth, wherein the at least one fitting medium has a coplanar depth different from the first depth and the second depth; The curve, the second closed curve and the at least one fitting medium closed curve combine to produce a strip-shaped curved surface; calculating the strip-shaped curved surface to generate a cutting path. The method for generating a cutting path of a CNC machine tool dialog controller according to claim 1, wherein the two-dimensional drawing file is in a DXF format. The cutting path generation method of the CNC machine tool dialog controller according to the first aspect of the invention, wherein the strip-shaped curved surface is a 3D curved surface. The cutting path generation method of the CNC machine tool dialog controller according to claim 1, wherein the closed curve in the fitting is generated in an equal layer offset manner. The cutting path generation method of the CNC machine tool dialog controller according to claim 1, wherein the plurality of line segments include at least one of a straight line, an arc, and an aggregation line. The method for generating a cutting path of a CNC machine tool dialog controller according to claim 1, wherein the strip-shaped curved surface presents a beveled pocket or a beveled convex island.