JP3412850B2 - Tool path data creation device and method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool path data creating apparatus for creating tool path data to be given to an NC machine tool, and particularly to a tool suitable for setting a machining area required when creating tool path data. The present invention relates to a route data creating device.

[0002]

Conventionally, in a CAD / CAM system or the like, for example, using a design drawing of the pressurized Engineering object, NC milling machine, or tool path data generating device for generating tool path data to be supplied to the NC machine tool machining center, etc. So when setting the processing target area of the pressurizing Engineering product calculates the machining end height of the processing target region of the workpiece, the machining
Regions were set by extracting regions in order of increasing end height .

FIG. 23 is an explanatory view of a conventional processing method for a work piece, FIG. 23 (a) is a plan view of the work piece, and FIG.
3 (b) is its front view, and the cutting portion is shown as a hatched portion. In FIG. 23, the height of the upper end of the cutting portion corresponding to each region r1 to r4 is the processing start height, and the height of the lower end of the cutting portion is the processing end height. The maximum height of the work piece. Further, FIG. 24 is an explanatory diagram of a conventional processing procedure. In the case of processing the workpiece shown in FIG. 23, the processing area in FIG.
As shown in (4) to (4), the machining end heights are set in descending order, and the machining is performed from the machining area (1) to the machining area (4) in order.

[0004]

Conventionally, since the machining areas are set in descending order of the machining end height, as shown in FIG. 24, the areas r1 and r2 have a cutting depth smaller than the tool standard cutting depth. There is a problem that the tool is cut many times, the tool performance is not fully utilized, and the working efficiency is reduced. Further, in the case of processing the shape as shown in FIG. 13A, if the processing ends are arranged in the descending order of height, r9 → r8 → r
2 → r1 → r4 → r6 (r1, r4, r6r have the same height) → r3 → r7 (r3, r7 have the same height), and the cutting portion is (1) to (8) in FIG. 13B. As indicated by the reference numeral, there is a problem that the machining is performed in the order of (1) to (8), the movement of the tool frequently occurs, and the machining efficiency is reduced.

The present invention has been made in view of the present situation of setting a machining area of this kind as described above, and an object thereof is to provide a tool path data creating apparatus capable of setting a machining area so that machining can be performed efficiently. To provide.

[0006]

In order to achieve the above object, the present invention provides a tool path data creating apparatus for creating tool path data based on a set machining area, with a cutting amount equivalent to a tool standard cutting amount. Duplication when cutting
Setting means for setting the cutting height of the number, and the standard cutting area setting means for setting a plurality of standard cutting area cutting respectively the plurality of cutting height, working ends in the tool standard depth of cut is smaller than the depth of cut A compound that cuts to height
Non-standard cutting area setting means for setting a number of non-standard cutting areas, knitting means for knitting the plurality of standard cutting areas and the plurality of non-standard cutting areas in a tree structure in the cutting height direction, and the tree Following the structure, a plurality of standard cutting areas, a plurality of
And a creating means for creating tool path data by connecting the non-standard cutting areas . Further, in the present invention, the creating means preferentially follows the tree structure by prioritizing the standard cutting area, and thus the plurality of standard cutting areas,
The tool path data is created by connecting the non-standard cutting areas of. In the present invention, said preparation means connecting each said standard cutting area and each said non-standard cutting region by tracing the tree structure a plurality of non-standard cutting region in ascending order of machining height having a parent-child relationship By doing so, tool path data is created. Further, in the present invention, the knitting means knits a tree structure with respect to a cutting area related to a cutting height reached by the tool in ascending order of the tool length with respect to tools having different tool lengths with the same tool type and tool diameter. For a tool with a long tool length, a tree structure is knitted in a cutting region related to a cutting height lower than the cutting height reached by the tool with a short tool length. Further, in the present invention, the knitting unit selects a region that can be machined at a cutting height corresponding to the tool standard cutting amount set by the standard cutting region setting unit, and a region selected by the selecting unit. Grouping means for grouping based on the adjacency relationship, the tree structure is organized for each group grouped by the grouping means, and the creating means is a group grouped by the grouping means. Tool path data is created for each and the tool path data of each group is connected. Further, in the present invention,
The knitting means further includes a center locus creating means for creating a tool center locus for each region in the group grouped by the grouping means, and a tool center locus created by the center locus creating means for a tool radius only. Closed area creating means for creating an enlarged closed area, and creating an area having a common part with the closed area created by the closed area creating means,
A cutting area, a cutting range, a processing area, and processing area information creating means for creating processing area information including parent-child relationship information, and the creating means stores the processing area information created by the processing area information creating means. It is used to create tool path data. In the present invention, the tool center locus is
It is used to judge the entry of tools. Further, in the present invention,
When the center locus creating unit cannot create the tool center locus of the machining area, the knitting means has the highest machining end height among the areas adjacent to the machining area and having a higher machining end height than the machining area. The low area and the processed area are combined. Further, in the present invention, the knitting means processes a processing area extracting means for extracting a leaking area from each parent-child information of the processing area information of the standard cutting area, and an area extracted by the processing area extracting means. Area rearrangement means for rearranging in order of decreasing end height, center locus creating means for creating a tool center locus of the area, and a closed area obtained by enlarging the tool center locus created by the center locus creating means by the tool radius. Create a closed area creating unit to create and an area having a common part with the closed area created by the closed area creating unit, and create processing area information including cutting height, cutting range, processing area and parent-child relationship information. Machining area information creating means for creating tool path data using the machining area information created by the machining area information creating means.

Further, according to the present invention, in a tool path data creating method for creating tool path data based on a set machining area, a plurality of cutting heights at the time of cutting with a cutting amount of a tool standard cutting amount, At the multiple cutting heights
A plurality of standard cutting areas to be cut respectively, and a plurality of non-standard cutting areas to be cut to a processing end height with a cutting amount smaller than the tool standard cutting amount are set, and
A plurality of standard cutting areas and a plurality of non-standard cutting areas are knitted into a tree structure in the cutting height direction, and the plurality of standard cutting areas and a plurality of non-standard cutting areas are connected by tracing the tree structure. By doing so, the tool path data is created. Further, in the present invention, in the knitting process, a region that can be machined at a cutting height corresponding to the set tool standard depth of cut is selected, and the selected region is grouped based on an adjacency relationship, and the grouping is performed. The tree structure is organized for each created group, and in the creating process, tool path data is created for each group, and the tool path data of each group is connected. Further, in the present invention, in the knitting process, a tool center locus is further created for each area in the group, a closed area is created by expanding the created tool center locus by a tool radius, and the created area is created. An area having a common part with the closed area is created, and processing area information including cutting height, cutting range, processing area, and parent-child relationship information is created, and in the creating process, the created processing area information is used. Creating tool path data. Further, in the present invention, in the knitting process, when the tool center locus of the machining region cannot be created, the machining end height is higher in the region adjacent to the machining region and having a higher machining end height than the machining region. The lowest area and the processed area are combined. Further, in the present invention, in the knitting process, a leaking region is extracted from each parent-child information of the machining region information of the standard cutting region, and the retrieved region is rearranged in ascending order of machining end height. In other words, create a tool center locus in the above area, create a closed area by expanding the created tool center path by the tool radius, create an area having a common part with the created closed area, and cut height. Then, processing area information including a cutting range, a processing area, and parent-child relationship information is created, and in the creation processing, tool path data is created using the created processing area information.

[0008]

When the tool path data is created on the basis of the set machining area, it is possible to use a plurality of cutting heights when cutting with the cutting amount corresponding to the tool standard cutting amount and the plurality of cutting heights. A plurality of standard cutting areas to be cut respectively, and a plurality of non-standard cutting areas to be cut to a processing end height with a cutting amount smaller than the tool standard cutting amount are set, and the plurality of standard cutting areas and a plurality of non-standard cutting areas are set. a cutting area is organized processed tree structure towards the cutting height direction, said plurality of standard cutting region by tracing the tree structure, a plurality
The tool path data is created processed by the non-standard cutting regions are connected Rukoto of.

Further , at the time of the knitting processing, the above-mentioned settings are made.
Area that can be machined at the cutting height corresponding to the standard depth of cut
Is selected and this selected area is based on
The tool is grouped and each grouped area is in the tool
A center locus is created, and this tool center locus is expanded by the tool radius.
A large closed area is created and has a common part with this closed area.
Area is created, and cutting height, cutting range, machining area and
And processing area information including parent-child relationship information is created. Na
The tool center locus is used for tool entry determination.
It

In the knitting process, the standard cutting area
It is missing from each information in the parent-child relationship of the processing area information of
The area is picked up, and the picked up area is
Sorted in ascending order, the tool center locus in this area
Created. And this tool center locus is only the tool radius
An enlarged closed area is created and has a common part with this closed area
The area is created, cutting height, cutting range, machining area and
Machining area information including parent-child relationship information is created.

Further, at the time of the knitting processing, the above-mentioned settings are made.
It is possible to process with the cutting height corresponding to the standard cutting depth of the tool.
Select an area and base this selected area on an adjacency
Grouped, and each grouped group
A notation tree structure is organized, and in the creation process, each group is
Tool path data is created in the
Are connected .

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a block diagram showing the schematic arrangement of a tool path data creating apparatus common to the first and second embodiments of the present invention. This tool path data creation device performs tool path data creation processing with the central processing unit 1 as the core. The central processing unit 1 includes an input device 2 including a keyboard, a mouse, etc., a semiconductor memory, a magnetic disk, etc. Storage device 3 and input / output control device 4
And a display device 5 including a graphic display and the like are connected. Further, the input / output control device 4 is connected to an external storage medium 6 such as a magnetic tape, a floppy disk, a magnetic disk and the like, and an NC machine tool 7,
The input / output control device 4 is under the control of the central processing unit 1 and has a tool path (C
L) Control such as outputting data to the NC machine tool 7 or loading various application programs for connecting tool path data from the external storage medium 6 into the storage device 3 is performed.

The storage device 3 stores data corresponding to CAD graphic elements (coordinates of start point / end point in the case of a two-dimensional line segment, coordinate values of start point / end point / center in the case of a two-dimensional arc, and a rotation direction,
In the case of a two-dimensional circle, the geometric information sufficient for determining the graphic element such as the center coordinate and the radius and the set information and the arrangement information of the graphic element) and the closed area data obtained by connecting the CAD graphic elements to form a closed area (The closed region is composed of one outer peripheral loop and zero or more inner peripheral loops), 2.5-dimensional data in which information such as depth direction such as height is added to the closed region, the shape of the machining tool -Tool data such as usage conditions, machining method data such as machining method, machining status information such as machining status of a region (one closed region), calculation results generated during machining region setting processing, and created CL data representing the tool moving path is stored.

A menu is displayed on the display device 5 under the control of the central processing unit 1, and this menu is displayed on the keyboard,
The CL data linking process can be carried out in an interactive manner while selecting and instructing with the input device 2 such as a mouse. At this time, the central processing unit 1 reads the application program selected / instructed from the menu from the external storage medium 6 into the storage device 3 via the input / output control device 4, and executes the processing area setting process or the like according to the application program. Performs various tool path data creation processing.

Next, referring to the flowchart of FIG. 2 in the machining area setting method of the embodiment, based on the creation of the tool path data, the standard cutting area setting for setting the area to be machined by the cutting for the tool standard cutting amount The step S1 and the non-standard cutting area setting step S2 for setting the area to be cut with a cutting amount smaller than the standard cutting amount will be described in this order.

[Standard cutting area setting step] In step S1 of the flowchart of FIG. 2, the central processing unit 1 sets the processing range and cutting height based on the tool information, the closed area information and the processing information from the storage device 3. Setting, determine the area that can be machined at each cutting height, divide this area into machining areas, and create machining area information with the machining priority between cutting heights as attributes. The height and processing area information is stored in the work area of the storage device 3.

FIG. 3 is a flow chart showing the details of the processing in step S1 of FIG. 2. In step S101, the central processing unit 1 reads the tool information stored in the storage device 3. This tool information is categorized by tool type and tool diameter in the order of use, at least one tool with a different length is registered in one tool diameter, and standard machining conditions such as the standard cutting amount of each tool and tool material The tool shape is registered.

FIG. 4 is an explanatory view of the tool shape. The tool is attached to the NC machine tool by the holder portion H at the shank portion S, and the diameter of the tip of the side blade is the tool diameter Dos and the relief portion of the side blade. Is called the tool diameter D1 and the diameter of the shank portion S is called the shank diameter D2. The actual length of the blade is the tool length L0, the length from the tip to the shank portion S is the tool length L1, and the tip to the holder portion H. Are called tool length L2. Here, when the tool diameter D1 ≧ the tool diameter D2, the tool length L1 =
The tool length is L2.

From step S101 to step S102, the central processing unit 1 searches the tool information read in step S101, and in step S102, it is determined whether or not there is an unprocessed tool group. When it is determined in step S102 that there is an unprocessed tool, the central processing unit 1 refers to the tool information extracted in step S101 and the machining information stored in the storage device 3 in step S103, A machining range in the depth direction is set for the tools in the tool group, and the set machining range is stored in the storage device 3. If it is determined in step S102 that there is no unprocessed tool group, the setting process of the area that can be machined with the standard tool cutting depth ends.

FIG. 5 is a flow chart showing the details of the processing in step S103 of FIG. 3, and FIG. 6 is an explanatory diagram of setting the machining range in the depth direction of the tool. Step S201 of FIG.
Then, the central processing unit 1 refers to the processing information such as the processing start height and the end height of the area stored in the storage device 3 and refers to the maximum value of the processing start height shown in FIG. Obtain the minimum value of the finishing height, set the cutting range of the workpiece,
The cutting range is stored in the storage device 3. Step S201
To step S202, and in step S202,
The central processing unit 1 sets the processing range setting start height by referring to the maximum height of the workpiece, and stores the processing range setting start height in the storage device 3.

Next, in step S203, it is determined whether or not there is a tool for which the machining range in the depth direction has not been set in the tools of the target tool group, and it is determined in step S203 that no tool has not been set. Then, the processing of setting the machining range in the depth direction for the tools of the focused tool group is completed. Further, when it is determined in step S203 that there is an unset tool, the process proceeds to step S204, and the central processing unit 1 determines the tool shape, the maximum height of the workpiece, and the machining start height set in step S201. By referring to the maximum value, the minimum value of the machining end height, and the machining range setting start height set in step S202, the machining range in the depth direction that can be machined with the tool length L1 of the target tool is set. In this case, for the starting height of the machining range in the depth direction that can be machined with the tool length L1 of the target tool, the maximum value of the machining start height shown in FIG. 6B is compared with the machining range setting start height, Set the smaller value. Further, as shown in FIG. 6B, the end height of the machining range in the depth direction that can be machined with the tool length L1 of the tool of interest is the height obtained by lowering the tool length L1 from the maximum height of the workpiece as shown in FIG. 6B. Compare with the minimum value of the processing end height and set the larger value.

Next, in step S205, the central processing unit 1 compares the height of the lowest point of the machining range in the depth direction set in step S204 with the minimum value of the machining end height set in step S201. , It is determined whether the tool length L1 reaches the lowest point of the cutting range of the workpiece. In this determination, when the tool length L1 reaches the lowest point of the cutting range of the workpiece, the process proceeds to step S206, where the central processing unit 1 adds an attribute indicating the unused state to the unprocessed tool. After the processing, the information is stored in the storage device 3. As shown in FIG. 7C, when the tool Ts having a short tool length reaches the lowest point of the cutting range of the workpiece, it is not necessary to use the tool Tl having the same diameter and a long tool length. This is because. When it is determined in step S205 that the tool length L1 does not reach the lowest point of the cutting range of the workpiece, the process proceeds to step S207, and the central processing unit 1 determines the depth direction in which the tool length L1 of the focused tool allows machining. With reference to the machining range, the end height of the machining range is updated as the machining range setting start height and stored in the storage device 3.

From step S207 to step S208, the central processing unit 1 determines the tool shape, the maximum height of the workpiece, the processing range setting start height, the maximum value of the processing start height set in step S201, and the processing. With reference to the minimum value of the end height, the working range in the depth direction that can be machined with the tool length L2 is set. Here, the machining range in the depth direction that can be machined with the tool length L2 means a range in which the shank portion S of the tool can be machined from the maximum height of the workpiece as shown in FIG. 7D. . In this case, the end height of the machining range in the depth direction that can be machined with the tool length L2 of the focused tool is compared with the height obtained by lowering the tool length L2 from the maximum height of the workpiece and the minimum value of the machining end height. Then, set the larger value. However, as shown in FIG. 8E, the tool diameter D2 is equal to the tool diameter D1.
In the following cases, the tool length L1 = the tool length L2, and the machining range in the depth direction that can be machined with the tool length L1 includes the machining range in the depth direction that can be machined with the tool length L2. The processing range in the depth direction that can be processed by is not set. Next, in step S209, the central processing unit 1 stores the machining range of the tool of interest in the depth direction in the storage device 3.

By the processing range setting process described above, a processing range of one tool group having the same diameter but different tool lengths is created as shown in FIG. 8 (f). The figure shows a case where three tools are registered in one tool group, and a range that can be machined with the tool length L1 of each tool and a range that can be machined with the tool length L2 are set. .

Next, returning to step S104 in the flowchart of FIG. 3, it is determined in step S104 whether or not the processing range has been set. If the processing range has been set, the process proceeds to step S105 and the center is set. The processing device 1 refers to the machining range in the depth direction set in step S103, the tool information such as the tool standard depth of cut stored in the storage device 3 and the machining information such as the drawing max height, and the tool group of interest. The cutting height of the tool belonging to is set, and the cutting height is stored in the storage device 3.

FIG. 9 is a flow chart showing the details of the process of step S105 of FIG.
The central processing unit 1 refers to the attribute indicating the non-use state of the tool and the cutting range in the depth direction, which are stored in the storage device 3,
Read out the tool for which the cutting range in the depth direction is set. Next, in step S302, it is determined whether or not there is a tool that has not been subjected to the cutting height setting process. If there is no unprocessed tool, the cutting height setting process based on the tool standard cutting depth is performed. Ends. Even when the tool cannot be read in step S301, the processing is performed in the same manner as when there is no unprocessed tool.

When it is determined in step S302 that there is an unprocessed tool, the process proceeds to step S303, and the central processing unit 1 refers to the machining range in the depth direction of the focused tool stored in the storage device 3. In step S304, the standard cutting amount of the tool of interest is referred to from the tool information stored in the storage device 3. Next, the process proceeds to step S305, and whether the cutting height setting process is completed in all the machining ranges set for the tool of interest (the machining range that can be machined with the tool length L1 and the machining range that can be machined with the tool length L2) A decision is made. In this determination, if it is determined that the setting process is completed, the process returns to step S302, and if it is determined that the setting process is not completed, the process proceeds to step S306.
The central processing unit 1 sets the cutting height by referring to the standard cutting amount of the tool of interest and the machining range in the depth direction.

FIG. 10 is an explanatory view of setting the cutting height. In FIGS. 10A and 10B, the tool is lowered by a predetermined distance from the cutting start height, and the workpiece is machined by moving horizontally. The case where the cutting part of the object is processed is shown. In this case, the depth of the tool in the depth direction is the depth of cut, the trajectory of the tool tip is the cutting surface, and the Z value of the cutting surface is the cutting height. This cutting height is given by equation (1), where dZ is the standard depth of cut of the tool of interest, hs is the starting height of the machining range in the depth direction, and he is the ending height. (1) h (i) = hs−i · dZ (i = 1, 2, ... N) where n is a quotient obtained by dividing the machining range (hs−he) by the standard cutting amount dZ of the tool of interest. is there.

Further, as shown in FIG. 11C, the end height he of the machining range in the depth direction is compared with the cutting height h (n), and the minimum machining depth set as the machining condition is set. When the difference is larger than (the amount that can be cut even if the cutting is performed by adding this value to the standard cutting amount), the end height he of the working range in the depth direction is added as the cutting height. The depth of cut at this time is smaller than the standard depth of cut of the tool,
It is handled in the setting process of the area that can be machined with the standard cutting depth of the tool. The cutting height thus set is stored in the storage device 3 by the central processing unit 1. By such a cutting height setting process, the cutting height is set for a tool in which the machining range in the depth direction of one tool group is set. Incidentally, in FIG. 11 (d), the standard cutting depths of the first to third tools are ΔZ1, ΔZ2, and Δ, respectively, with respect to the machining range in the depth direction of the tools having the same diameter but different lengths.
An example of the cutting height set as Z3 is shown.

Now, returning to the flowchart of FIG. 3,
In step S106, the central processing unit 1 uses the standard cutting depth of the tool to set the cutting height of the tool set in step S105, the tool information read in step S101, the 2.5D data stored in the storage device 3, and the machining information. Referring to, the area in which the tool can be moved by cutting is obtained in consideration of the interference with the workpiece at each cutting height, and the cutting height processing area information is created for the focused tool. The machining area information thus created has a parent-child relationship as will be described later, and a tree structure (machining area search tree) of the machining area information of the tool of interest is created. The tool information is added, and the central processing unit 1 stores the storage device 3
Stored in.

FIG. 12 is a flow chart showing the details of the processing in step S106 of FIG. 3, and in step S401, the central processing unit 1 determines the processing start and end heights of each area stored in the storage device 3. Refer to the processing information,
The presence or absence of a cut portion is detected, and if there is a cut portion, it is extracted as a region to be processed. Next, in step S402, the central processing unit 1 refers to the adjacent information between the areas stored in the storage device 3, classifies the areas read in step S401 by the adjacent information, and groups the processing target areas. , The processing target area is stored in the storage device 3.

FIG. 13 is an explanatory diagram of the grouping of the processing target areas based on the adjacency relationship. FIG. 13A shows an example in which the processing target areas are grouped, and the processing target areas r1 to r9 are shown.
Is divided into a group of processing target areas r1 to r4 and a group of processing target areas r6 to r9. By such processing, it becomes possible to take out the processing target area for each cutting portion. By the way, the conventional method is shown in FIG.
As shown in (b), it is divided into cutting parts (1) to (8) and is cut in the order of (1) to (8).

From step S402 to step S403, it is judged whether or not there is an unprocessed tool for which the processing area information setting process is present. If there is no unprocessed tool, processing area information creation processing is performed. Ends. If it is determined in step S403 that there is an unprocessed tool,
In step S404, the central processing unit 1 reads out and refers to the cutting height of the target tool stored in the storage device 3. Then, in step S405, it is determined whether or not there is an unprocessed cutting height based on the read cutting height of the region of interest. If there is no unprocessed cutting height in step S405, the process returns to step S403,
If there is an unprocessed cutting height, step S406.
Then, the central processing unit 1 refers to the 2.5D data, tool information, and machining information stored in the storage unit 3 to set the machining region information, and stores the machining region information in the storage unit 3. .

Next, details of the processing for creating the processing area information will be described with reference to the flow chart for creating the processing area information in FIG. 14 and the explanatory view of the processing information in FIG. 14
In step S501 of the flowchart of FIG. 5, the central processing unit 1 refers to the machining area information stored in the storage device 3 and pays attention to the machining area information set to the cutting height one level higher than the cutting height of interest. . Here, the processing area information is R
It is defined as (n, id), and the processing area information that the group id has in the nth pick feed is shown. The machining area information consists of a cutting height, a cutting area, and an area having a common part with the cutting area. Each machining area information is connected by a tree structure, and the parent machining area information can be traced to the child machining area information. , The processing order can be determined. The nth pick feed is a cutting surface when cutting is performed n times in the depth direction, and the group id is a value uniquely set for each pick feed.

In this processing, the first pick feed processing is general-purpose by setting the processing area information R (0, id) id = 1, 2, ... To the information created in step S402 of FIG. Can be treated to. Hereinafter, the focused cutting height will be described as the cutting height of the cutting surface of the (i) th pick feed. Since there is one or more pieces of processing area information set to the cutting height (i−1th pick feed) one level higher than the cutting height of interest, step S501.
Then, all R (i-1, id), i = 1, 2, ... Are taken out.

Processing proceeds from step S501 to step S502, and processing area information R read in step S501.
Among (i-1, id), whether or not there is a processing area for which the setting processing of the processing area of the cutting height (i-th pick feed) of interest is unprocessed with respect to the area included in the processing area information. When it is determined that the unprocessed processing area does not exist in step S502, the processing for setting the processing area information of the cutting height ends. If it is determined in step S502 that there is an unprocessed processing area, step S503.
Then, the central processing unit 1 refers to the constituent area of the processing area information of interest and reads the height information of each area from the storage device 3 and compares it with the cutting height of interest to select the preliminary selection area.

Since all the areas to be processed in the (i) th pick feed have been read out from this preliminary selection area,
It is defined as W (i, 0). For W (i, 0), the target machining area information R (i− 1, j) can be machined at the target cutting height among the areas belonging to one of the i−1th machining area information. The area is selected. In the processing of setting the processing area information shown in FIG. 15, in the example shown in FIG.
Areas r2, r3, r4, r that can be cut by the (i) -th pick feed based on the processing area information R (i-1, j) of the (i-1) -th pick feed composed of 2 to r7.
7 is read as W (i, 0).

From step S503 to step S504, the central processing unit 1 further divides the preliminary selection area W (id) read out in step S503 into groups into a preliminary selection group based on the adjacency relationship, and the groups are grouped. The preliminary selection group is stored in the storage device 3. This preliminary selection is W (ik) (k is the preliminary selection group id
, K = 1, 2 ...). In the example shown in FIG. 15A, a region W adjacent to the preliminary selection region W (i, 0) is grouped into regions W2, r3, and r4.
(I, 1) and W (i, 2) composed of the region r7 are grouped.

Next, in step S505, the preliminary selection groups grouped in step S504 are sequentially read, and it is determined whether or not there is an unprocessed preliminary selection group for which the processing area information setting process has not been performed. If there is no preselected group for processing, step S5
Return to 02. If it is determined in step S505 that there is an unprocessed preliminary selection group, the process proceeds to step S506, the central processing unit 1 reads the graphic data of the area belonging to the preliminary selection group from the storage device 3, and the area higher than the cutting height. The graphic data of is read from the storage device, and when the tool moves on the cutting surface, it creates an area where the tool can move, considering the high-frequency interference area where the tool interferes with the workpiece and the tool cannot enter. Tool radius (tool diameter D1 /
2) Create a reduced tool center locus.

From step S506 to step S507, the central processing unit 1 expands the tool center locus created in step S506 by the tool radius to create a closed area,
The created closed area is stored in the storage device 3. The closed area obtained by expanding the tool center locus by the tool radius is an area where the tool can enter the cutting portion at the cutting height while avoiding interference with the workpiece, and in this case, the tool center locus is not created in step S506. At this time, the closed area is not created.

FIG. 15B is a plan view of FIG. 15A viewed from the Z direction, and FIG. 15C shows T as a tool and A as each area of the preliminary selection group W (i, 1). As a shape, this W
FIG. 16D is a diagram showing the tool center locus CR created for (i, 1), and FIG. 16D is a diagram showing a closed area CA in which the tool center locus is enlarged by the tool radius. In addition, in FIG.
1 and r2 are areas higher than the cutting height. In this case, there is a narrow portion W in which the tool T cannot pass in the composite area (area r3) of the preliminary selection group, and the closed center created by expanding the tool center locus by the tool radius. A plurality of areas CA1 and CA2 (two in this case) are created.

From step S507 to step S508, the closed areas created in step S507 are sequentially focused on, and it is determined whether or not there is an unprocessed closed area.
When there is no unprocessed closed region, the process returns to step S505. When it is determined in step S508 that there is an unprocessed closed region, the process proceeds to step S509, and the central processing unit 1 reads a region belonging to the preliminary selection group having a common part with the closed region created in step S507, Processing area information including information such as cutting height, cutting range (closed area), and parent-child relationship is created, and the processing area information is stored in the storage device 3.
To store. In the case of FIG. 15, the constituent regions r2, r of the preliminary selection group of interest having a common region and a closed region created by enlarging the tool center locus shown in FIG.
3 and r4 are the constituent areas of the processing area information R (i, l), the processing area information R (i-1, j) is the parent, and the processing area information R (i, l) is the child, and a parent-child relationship is set. It Similarly, processing area information R (i,
m) is set as a child of the processing area information R (i-1, j).

[Non-standard cutting area setting step] Returning to step S2 in FIG. 2, the central processing unit 1 executes step S1.
From the machining area information and 2.5D data stored in the storage device 3, the graphic information of each area, the machining start height, the machining end height, and the workpiece max height from the machining information, and the tool shape from the tool information. Are read out, the cutting portion is searched from these pieces of information, and a machining area for machining the cutting portion with a cutting depth smaller than the standard cutting depth of the tool is created. The processing area information created in this way is added to the processing area information created in step S1 and stored in the storage device 3.

FIG. 17 is a detailed flowchart of the processing of step S2 in FIG. 2. In step S601, the central processing unit 1 processes the machining area information R (that can be machined with the standard tool cutting depth stored in the storage device 3). The information defined by (n, id) is read separately for each tool. Then, step S
In 602, it is determined whether or not there is unprocessed machining area information based on the machining area information read in step S601. If there is no unprocessed machining area information, it is smaller than the standard tool cutting depth. The setting process of the region to be processed with the cut amount is completed. Step S602
When it is determined that there is unprocessed processing area information,
In step S603, the central processing unit 1 reads an area belonging to the processing area of interest information, and if the area is not included in the processing area information of the child of the processing area of interest, the cutting amount is smaller than the tool standard cutting amount. Is extracted as an area to be processed, and the extracted area is stored in the storage device 3.
When there is no child in the processing area information of interest, this area is not extracted.

Next, in step S604, it is determined in step S603 whether a region to be machined with a cutting amount smaller than the tool standard cutting amount has been extracted.
If it is determined that the area has not been extracted, step S60.
Returning to step 2, if it is determined that the area is extracted, the process proceeds to step S605. At step S605, the CPU 1, reorder area machining end height of the area read out in step S603 in ascending order of the processing end height.

From step S605 to step S606, it is determined whether or not there is an unprocessed area for which the processing area information is set. If there is no unprocessed area, the process returns to step S602 and the unprocessed area is processed. Is present, the process proceeds to step S607. In step S <b> 607, the central processing unit 1 obtains a region which is adjacent to the cutting region and the region of interest with respect to the region of interest and whose machining end height is lower than that of the region of interest and for which the processing region information has not been set. Is set, and the processing area information is stored in the storage device 3.

FIG. 18 is a flow chart showing the details of the processing in step S607 of FIG. 17, and in step S701, the central processing unit 1 reads the processing end height of the processing area of interest stored in the storage device 3. Next, in step S702, it is determined whether or not the depth of cut (penetration depth) from the target cutting height to the processing end height is smaller than the tool standard depth of cut, and if it is determined to be small, then it is large in step S703. If it is determined that step S7
Proceed to 06.

In step S703, the central processing unit 1
Detects whether there is an area adjacent to the region of interest whose processing end height is lower than the processing end height of the region of interest and processing region information has not been set. The closed area is combined to obtain the processing target area, and when there is no unset area, the closed area of the target processing area is set as the processing target area. Next, in step S704, it is determined whether or not cutting is possible based on the tool center locus of the processing target area created by the central processing unit 1. If cutting is not possible, the cutting height and the processing area are obtained. If the processing area information is set, the processing is terminated, and cutting is possible, the process proceeds to step S705.

In step S705, the central processing unit 1
Defines the machining end height of the region of interest as the cutting height, sorts the machinable region for each tool center locus, creates machining region information, and stores the machining region information in the storage device 3.

On the other hand, in step S702, the cutting amount (penetration depth) from the target cutting height to the processing end height.
Is determined to be larger than the tool standard depth of cut, the process proceeds to step S706, the central processing unit 1 obtains the region adjacent to the region of interest having the lowest machining end height, and the machining end height of the obtained region is calculated. Are compared with each other, and the region having the lowest processing end height is extracted. Next, in step S707,
It is determined whether or not the region has been extracted in step S706, and if it is determined that the region has been extracted, step S706
In step 708, if it is determined that the area has not been extracted, the process advances to step S709.

In step S708, the central processing unit 1
Combines the extraction area obtained in step S <b> 706 with the area of interest, sets an attribute that allows simultaneous processing when the extraction area is focused, and stores the attribute in the storage device 3. Further, in step S709, the central processing unit 1 calculates how far the tool penetrates into the region of interest, sets the height at which the tool can penetrate into the cutting height, sets the machining region information, and stores the machining region information in the storage device 3 To store.

FIGS. 19 and 20 are explanatory views of the setting processing of the processing area information for processing with a cutting amount smaller than the tool standard cutting amount. In FIG. 19 (a), when the region r1 is focused, the region r1 is determined in step S708. Combined with region r2,
When focusing on the region r2, the regions r1 and r2 are checked in step S705.
It shows a case where the processing area information is set for.
Further, as shown in FIGS. 19 and 20, the machining area information of the area to be machined with the cutting amount smaller than the tool standard cutting amount is defined as A (n, id), and this processing region information is A
(N, id) has a parent-child relationship with the machining area information R (n-1, i) of the area that can be machined with the standard tool cutting depth. With respect to the processing area information R (n-1, i), the processing area information A (n, j) is composed of areas r1 and r2, and the cutting height is the processing end height of the area r2. In addition, A (n,
k) is composed of the region r3, and the cutting height is the processing end height of the region r3. The priority of machining when creating the tool path is A (n, j) and A (n, k) in ascending order of cutting height.

In FIG. 20B, since the tool does not enter the area, there is an area in which the cutting amount up to the machining end height is larger than the tool standard cutting amount, and step S706.
In the above, the example is a case where there is no adjacent region. Incidentally, in the embodiment, in step S709, the height at which the tool invades is obtained for the machining area information R (n-1, i), and the height is taken as the cutting height, and the machining area information A (n, i).
j) is set. FIG. 20 (c) is an example in which there is only a region in which the cutting amount up to the processing end height is smaller than the tool standard cutting amount. In this case, in the embodiment,
In step S704, since the tool cannot enter the areas r1 and r2, it is determined that cutting cannot be performed, and the area r3 is combined with the area r3 when attention is paid. As the processing area information, the cutting height is the processing end height of the area r3. A (n, j) composed of r1, r2, and r3 is created. Further, the cutting height is the processing end height of the region r4 and is constituted by the region r4.
(N, k) is created.

By the above processing, the tree structure of the processing area information (processing area search tree) is created for all the registered tools. 21 and 22 are explanatory diagrams showing the tree structure of the processing area information and the processing procedure. FIG. 21A shows the processing area search tree for processing the workpiece shown in FIG. 21B. Here, (f1) is the processing area information R (0,1), which is composed of areas r1, r2, r3. Since this information only indicates the processing target area and does not include the cutting information, the tool path data is not created. This information is created in step S402 of FIG. Further, (f2) is the processing area information R (1, 1) that can be processed with the tool standard cutting amount, and is composed of the area r1. This information is created in step S406 of FIG. Further, (f3) to (f5) are machining area information for machining with a cutting depth smaller than the standard cutting depth of the tool,
(F3) is A (2,1) and (f
4) is A (1,1), (f5) composed of the region r2
Is A (1, 2) composed of the region r 3 , and these pieces of information are created in step S607 of FIG.

Based on the machining area search tree of FIG. 21A, the machining area information that can be machined with the standard tool cutting depth is prioritized, and R (0,1) is prioritized for R (1,1). It Further, when there are a plurality of pieces of processing area information to be machined with a cutting amount smaller than the tool standard cutting amount, the processing area information with a low cutting height is prioritized, and the child A (1,1) of R (0,1), A (1,1) is preferentially processed with respect to A (1,2). This machining area search tree is traced in the order of (1) to (8), tool path data is created in each machining area information, and cutting is performed, so that as shown in FIG. Processing is performed in the order of 4).
In this case, the tool path data is not created in the machining area information once the tool path data is created.

FIG. 22 is an explanatory diagram of a tree structure of processing area information when the cutting portion is divided into a plurality of parts.
FIG. 23B shows an example of machining area information (machining area search tree) created for the workpiece shown in FIG. 23A, in which the cutting portion is divided into a plurality of cutting heights. However, since the processing area information is linked by the tree structure,
By tracing the machining area search tree shown in 2 (b) from (1) to (28) in sequence, the cutting portion can be machined in the machining order shown in FIG. 22 (a).

[0058]

As described above, by applying the present invention, a region capable of being machined with the standard cutting amount of the tool and a region having a smaller cutting amount than the standard cutting amount of the tool are processed. By setting and, and giving priority to the processing with the standard cutting depth of the tool, it becomes possible to process the workpiece by making full use of the performance of the tool, greatly improving the processing efficiency. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a tool path data creation device common to the first and second embodiments of the present invention.

FIG. 2 is a Zellar flowchart showing processing area setting processing executed in the process of creating tool path data.

FIG. 3 is a flowchart showing details of standard cutting area setting processing in step S1 of FIG.

FIG. 4 is an explanatory diagram of names of respective parts of the tool and shapes of the tool.

5 is a flowchart showing details of processing range setting processing for a target group in step S103 of FIG.

FIG. 6 is an explanatory diagram of setting a machining range in the depth direction of the tool.

FIG. 7 is an explanatory diagram of setting a machining range in the depth direction of the tool.

FIG. 8 is an explanatory diagram of setting a machining range in the depth direction of the tool.

9 is a flowchart showing details of cutting height setting processing based on a tool standard cutting depth in step S105 of FIG.

FIG. 10 is an explanatory diagram of cutting height setting.

FIG. 11 is an explanatory diagram of cutting height setting.

FIG. 12 is a flowchart showing details of the processing in step S106 of FIG.

FIG. 13 is an explanatory diagram of grouping of processing target areas based on an adjacency relationship.

FIG. 14 is a detailed flowchart of creating machining area information for machining with a tool standard cutting amount according to the embodiment.

FIG. 15 is an explanatory diagram of a processing area information setting process.

FIG. 16 is an explanatory diagram of a processing area information setting process.

17 is a detailed flowchart showing the process of step S2 of FIG.

FIG. 18 is a detailed flowchart showing a process of step S607 of FIG.

FIG. 19 is an explanatory diagram of a processing area information setting process for processing with a cutting amount smaller than the tool standard cutting amount.

FIG. 20 is an explanatory diagram of a processing area information setting process for processing with a cutting amount smaller than the tool standard cutting amount.

FIG. 21 is an explanatory diagram showing a tree structure of the processing area information and a processing procedure according to the embodiment.

FIG. 22 is an explanatory diagram of a tree structure of processing area information when a cutting portion is divided into a plurality of parts.

FIG. 23 is an explanatory diagram of a conventional processing method for a workpiece.

FIG. 24 is an explanatory diagram of a conventional processing procedure.

[Explanation of symbols]

1: Central processing unit 2: Input device 3: Storage device 4: Input / output device 5: Display device 6: External storage medium 7: NC machine tool

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-57-96752 (JP, A) JP-A-2-132503 (JP, A) JP-A 62-295116 (JP, A) JP-A 62- 176730 (JP, A) JP 60-150944 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23Q 15/00-15/28 G05B 19/18-19/46

Claims (14)

(57) [Claims] 1. A tool path data creating device for creating tool path data based on a set machining area, when performing cutting with a cutting amount corresponding to a tool standard cutting amount.
Setting means for setting a plurality of cutting height, and the standard cutting area setting means for setting a plurality of standard cutting area cutting respectively the plurality of cutting height, working ends in the tool standard depth of cut is smaller than the depth of cut and non-standard cutting area setting means for setting a plurality of non-standard cutting area cutting to a height, knitting organized into a tree structure towards the cutting height direction and a plurality of standard cutting region and a plurality of non-standard cutting area Means for tracing the tree structure, the plurality of standard cutting regions, and the plurality of non-standard cutting regions.
A tool path data creating device comprising: a creating unit that creates tool path data by connecting standard cutting areas . 2. The creating means is configured to trace the tree structure by giving priority to the standard cutting area to trace the plurality of standard cutting areas.
The tool path data creation device according to claim 1, wherein the area and a plurality of non-standard cutting areas are connected to create tool path data. Wherein the creation means, to the plurality of non-standard cutting region having a respective said standard cutting region and a parent-child relationship by tracing the tree structure low order of machining height connecting each said non-standard cutting area The tool path data creating device according to claim 1, wherein the tool path data is created by: 4. The knitting means knits a tree structure with respect to tools having the same tool type and tool diameter and different tool lengths in a cutting region related to a cutting height reached by the tools in ascending order of tool length, With respect to a long tool, a tree structure is knitted in a cutting region having a cutting height lower than a cutting height reached by the tool having a short tool length.
Tool path data creation device described in. 5. The knitting means selects a region that can be machined at a cutting height corresponding to the standard cutting amount of the tool set by the standard cutting region setting device, and a region selected by the selecting device. Grouping means for grouping based on adjacency, organizing the tree structure for each group grouped by the grouping means, and the creating means for each group grouped by the grouping means The tool path data creating apparatus according to claim 1, wherein the tool path data is created in the group, and the tool path data of each group is connected. 6. The knitting means further comprises a center locus creating means for creating a tool center locus for each area in the group grouped by the grouping means, and a tool center created by the center locus creating means. A closed area creating unit that creates a closed area in which the locus is expanded by the tool radius, and an area that has a common part with the closed area created by the closed area creating unit are created, and a cutting height, a cutting range, a processing area, and A machining area information creating unit for creating machining area information composed of parent-child relationship information, wherein the creating unit creates tool path data using the machining area information created by the machining area information creating unit. The tool path data creation device according to claim 5, wherein the tool path data creation device is a tool path data creation device. 7. The tool path data creation device according to claim 6, wherein the tool center locus is used for determining a tool approach. 8. The knitting means performs machining in an area adjacent to the machining area and having a machining end height lower than that of the machining area when the center trajectory creating means cannot create the tool center trajectory of the machining area. The tool path data creation device according to claim 6, wherein the region having the lowest end height and the machining region are combined. 9. The knitting means finishes processing of the processing area extracting means for extracting a leaking area from each piece of parent-child information of the processing area information of the standard cutting area, and the area extracted by the processing area extracting means. Area rearranging means for rearranging in ascending order of height, center locus creating means for creating a tool center locus of the area, and closed area in which the tool center locus created by the center locus creating means is expanded by a tool radius. And a region having a common portion with the closed region created by the closed region creating unit, and creates machining region information including a cutting height, a cutting range, a machining region, and parent-child relationship information. Machining area information creating means, wherein the creating means creates tool path data using the processing area information created by the processing area information creating means. The tool path data creation device according to claim 1. 10. A tool path data creating method for creating tool path data based on a set machining area,
When cutting with a cutting amount equivalent to the standard cutting amount of the tool
Setting a plurality of cutting heights, a plurality of standard cutting area cutting respectively the plurality of cutting height, and a plurality of non-standard cutting area cutting up processing end height the tool standard depth of cut is smaller than the depth of cut and, wherein the plurality of the standard cutting region and a plurality of non-standard cutting region toward the cutting height direction organizes processed tree structure, the plurality follow the tree structure
A method for creating tool path data by connecting the standard cutting area and a plurality of non-standard cutting areas to create tool path data. 11. In the knitting process, a region that can be machined at a cutting height corresponding to the set standard cutting depth of the tool is selected, the selected region is grouped based on the adjacency, and the grouping is performed. 11. The tool path data according to claim 10, wherein the tree structure is organized for each group, the tool path data is created for each group, and the tool path data of each group is connected in the creating process. How to make. 12. In the knitting process, a tool center locus is further created for each area in the group, and a closed area is created by expanding the created tool center locus by a tool radius,
An area having a common part with the created closed area is created, processing area information including cutting height, cutting range, processing area, and parent-child relationship information is created, and in the creating process, the created processing area is created. The tool path data creating method according to claim 11, wherein the tool path data is created using the information. 13. In the knitting process, when the tool center locus of the machining region cannot be created, the machining end height is the highest among regions adjacent to the machining region and having a higher machining end height than the machining region. The tool path data creating method according to claim 12, wherein the low area and the machining area are combined. 14. In the knitting processing, a region rearrangement is performed in which a leaking region is extracted from each parent-child information of the machining region information of the standard cutting region, and the retrieved region is rearranged in ascending order of machining end height. , Create a tool center locus in the above area, create a closed area by expanding the created tool center path by the tool radius, create an area that has a common part with the created closed area, and cut height 11. Machining area information including a cutting range, machining area, and parent-child relationship information is created, and in the creating process, tool path data is created using the created machining area information. Tool path data creation method.