JPH0724688A - Tool selection method for cutting work data - Google Patents

Abstract

PURPOSE:To provide a tool selection method for cutting work data capable of automatically deciding the optimum tool selection. CONSTITUTION:This method is provided with a limitation shape corresponding to a tool diameter table 8 having information about a limitation dimension of a work region limitation shape or reference and vertical diameters etc., a tool selection reference table 9 having plural tool selection references at every working kinds (process codes), a tool file 10 having information about a tool code, a tool abbreviated name, tool quality, a tool shape, and a holder code etc., and a holder file 11 having information about a holder diameter. Consequently the minimum corner diameter or minimum value of inter-wall distance of the work region limitation shape and the like are determined as a limitation shape value, then the retrieval range of the tool diameter is decided to retrieve a tool kind, and a tool is retrieved according to the decision of the tool kind to set a holder to decide a tool wherein the tool and the holder are not interfering with another region. Consequently the retrieval and decision of a tool kind and the retrieval of a tool can be automatically made while referring respective tables and files, automatically deciding the optimum tool selection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention determines a machining area and a machining type on the basis of a database consisting of area data having line segment information and machining height information forming a contour shape for each machining area, and then determining the tool type and the machining type. The present invention relates to a tool selection method of cutting data that determines a tool diameter.

[0002]

2. Description of the Related Art Conventionally, when an NC machine tool is used to perform cutting with an arbitrary contour shape and height (depth),
Rough grinding, intermediate grinding, finishing, finishing, and chamfering are performed in this order, but in each of these,
The machining order is determined for each of the plurality of machining areas, tools are selected, and NC data is created. In creating NC data like this, a human being determines the machining order and tool selection from the contour shape and cutting depth of the final product to be machined, the adjacency of each machining area, etc., and inputs that information to the system through interactive processing. It was a general method to do. Therefore, the basic part of the creation of NC data relies solely on the experience and subjectivity of the person who makes the judgment, and for example, it was not the case where the automatic determination processing that would result in the optimum machining order or tool selection was performed. .

[0003]

However, since humans make tool selections and create NC data as described above, know-how of machining technology is required to determine the optimum tool selection. And I had to be someone who had some knowledge of machining. Therefore, even if the conventional system is provided with the NC data creation program, it is necessary for an expert to make an empirical decision after grasping the overall processing, and not everyone can use it. There was a problem.

An object of the present invention is to solve the above problems and to provide a tool selection method of cutting data capable of automatically determining the optimum tool selection.

[0005]

To this end, the present invention determines a machining region and a machining type based on a database consisting of region data having line segment information and machining height information which form a contour shape for each machining region. It is a tool selection method of cutting processing data that searches the tool type and tool diameter and decides the tool, and has a limited shape compatible tool diameter table that has information such as the limited dimension, reference diameter, and vertical diameter of the machining area limited shape, Tool selection criteria table that has multiple tool selection criteria for each machining type (process code), tool file that has information such as tool code, tool abbreviation, tool material, tool shape, holder code, and holder file that has holder diameter information In addition, the minimum corner diameter of the machining area limited shape and the minimum wall distance etc. are obtained as the limited shape value, and then the search range of the tool diameter is determined to determine the tool type. Search, in which the tool and the holder by setting the retrieved Holder tool and determining the tool does not interfere with other areas in accordance with the determination of the tool type. If the tool type cannot be determined from the tool selection reference table, the tool is determined to have the highest priority ideal diameter tool in the tool selection reference table, and if no tool exists as a result of the tool search, or When the holder interferes with other areas, the tool diameter is reset by searching for the tool type and the tool.

[0006]

In the tool selection method of the cutting data of the present invention,
Restriction shape compatible tool diameter table that has information such as restriction dimensions, reference diameter, vertical diameter, etc. of machining area restriction shape, tool selection reference table that has multiple tool selection criteria for each processing type (process code), tool code, tool abbreviation , A tool file having information such as tool material, tool shape, holder code, and a holder file having information on the holder diameter are provided, and the minimum corner diameter of the machining area limiting shape and the minimum wall distance are calculated as the limiting shape value, After that, the search range of the tool diameter is determined, the tool type is searched, the tool is searched according to the determination of the tool type, the holder is set, and the tool and the tool that the holder does not interfere with other areas are determined. The optimum tool selection can be automatically determined by referring to each table and file to automatically perform the tool type search, determination, and tool search.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining an embodiment of a tool selection method for cutting data according to the present invention, FIG. 2 is a diagram for explaining a process code included in a graphic database, and FIG. 3 is a tool diameter table corresponding to a limited shape. FIG. 4 is a diagram showing an example of a tool selection reference table, FIG. 5 is a diagram showing an example of a tool file, and FIG. 6 is a diagram showing an example of a holder file. In the figure, 1 is a processing area determination unit, 2 is a processing type determination unit,
3 is a limited shape value calculation unit, 4 is a tool type determination unit, 5 is a tool determination unit, 6 is a tool radius resetting unit, 7 is a figure database,
8 is a tool diameter table corresponding to the limited shape, 9 is a tool selection reference table, 10 is a tool file, and 11 is a holder file.

In FIG. 1, a graphic database 7 includes element information, such as line segments divided into straight lines and curved lines representing the contour shape of each closed region (processing region) to be processed, current height information thereof, It has finished height information, process code, and the like. The machining area determination unit 1 reads element information such as line segments as graphic constituent elements from the graphic database 7 and present height information, finish height information, surface accuracy, etc. as area notation information to determine the machining order. The machining type determining unit 2 determines the machining type, and the machining type determining unit 2 determines the machining type of the determined machining region, such as chamfering, partial region wall, pocketing, outer circumference, and chamfering. The restricted shape value calculation unit 3 is for calculating the shape value of a processing area restricted shape such as a pocket, a partial wall of the area, or a face cut in which the tool diameter is restricted. The tool type determination unit 4 refers to the limited shape corresponding tool diameter table 8 to determine the search range of the tool diameter, and searches and determines the tool type within the range according to the priority order of the tool selection reference table 9. Yes, when the tool type is determined, the tool determination unit 5 searches for a tool from the tool file 10 and sets a holder based on the holder file 11 to determine whether the tool and the holder interfere with other areas. The tool is determined on the condition that interference check is performed and no interference occurs. The tool diameter resetting unit 6 resets the tool diameter by performing a search between the standard diameter and the upper and lower limit diameters with a standard diameter or a diameter other than the standard diameter when the tool and the holder interfere with other areas. is there.

As shown in FIG. 2, the process code stored in the figure database 7 includes face cutting, partial region wall, pocket,
It has information on the outer circumference, processing type such as chamfering, bottom accuracy, side accuracy, process, and shape. As shown in FIG. 3, the tool shape table 8 for limiting shape corresponds to limiting shape classification of corner diameter or width, limiting dimension, reference diameter as index of ideal diameter, and lower limit as index of how small it may be. Diameter, information of the upper limit diameter that is an index of how large the diameter can be made is set, and the tool diameter table 8 for this limited shape is set, and the usable tool diameter range is provided corresponding to the figure limited shape value, and the ideal diameter is set. If there is no tool, tool selection can be performed within that range. Tool selection criteria table 9
Has a material group code, a machining type (process code), and first to tenth tool selection criteria as shown in FIG. 4, and priorities are assigned to usable tool types according to the material / machining type of the machining area. By setting, if the ideal tool type does not exist in the tool file, the tools are selected in order of priority. The tool file 10 has information such as a tool code, a tool abbreviation, a tool material, a tool shape, and a holder code as shown in FIG. The holder file 11 is
As shown in FIG. 6, it has information on the holder diameter.

FIG. 7 is a diagram for explaining the limiting shape value. As the restricted shape value calculated by the restricted shape value calculation unit 3, for example, when the edges are pockets of all walls as shown in FIG. 7A, the minimum corner radius b and the minimum distance a between the walls are compared. Then, the smaller value is obtained, and FIG.
In the case of a partial wall as shown in (D), the smallest value among the minimum corner radius a, the minimum distance b between the walls, and the maximum distance c from the wall to the open surface is determined. Also, FIG.
In the case of face cutting as shown in (E), the width a perpendicular to the longitudinal direction of the minimum circumscribed rectangle of the area is obtained. Except when the tool diameter can be uniquely determined by the machining type,
The ideal tool diameter is determined by finding the limiting shape of the figure.

Next, a specific processing flow will be described. FIG. 8 is a diagram for explaining the flow of processing of a tool selection method for cutting data according to the present invention, and FIG. 9 is a diagram for explaining a tool resetting method.

In the tool selection method for cutting data according to the present invention, as shown in FIG. 8, first, these graphic constituent elements and area notation information are read from the graphic database 7 (step S1).

Next, the processing area and processing type are determined (steps S2 to S3). It should be noted that this processing can be applied by the method already proposed by the present applicant as a processing order determination method for cutting processing data, the details of which will be described later.
Then, the limit shape value of the processing area is calculated (step S
4).

Next, the tool diameter search range for the tool diameter is determined by referring to the tool diameter table 8 corresponding to the limited shape (step S5).
Subsequently, the tool type is searched by referring to the tool selection reference table 9 (step S6).

Here, it is judged whether or not the tool type has been determined (step S7), and after the first to tenth tool selection criteria in the tool selection criteria table 9 have already been searched, N
When the value becomes O, the tool is determined as the existence of the ideal diameter tool of the first priority tool (step S8). YE
In the case of S, the tool is searched by referring to the tool file 10 (step S9).

As a result, it is determined whether or not a tool is present (step S10). If YES, the holder file 11 having the holder diameter information as shown in FIG. Then, the tool / holder interference check is performed (step S11).
It is determined whether or not they interfere with each other (step S13), and if they do not interfere with each other, a tool is determined. If they interfere with each other, or if there is no tool in the previous step S10, the tool radius is reset (step S13). S14). Then, it is judged whether or not the tool radius can be reset, and if possible (if YES)
The tool search is repeated again from step S9. If not possible (in the case of NO), the tool type search from step S6 is repeated again.

To reset the tool diameter, first, as shown in FIG.
The standard diameter is searched within the lower limit of the reference diameter, and then the standard diameter is searched within the upper limit of the reference diameter. If the standard diameter cannot be set, the standard diameter is searched for other than the standard diameter, and then the standard diameter is searched for the non-standard diameter.

Next, the processing order determination method of the cutting processing data, which has been already proposed by the present applicant, will be described. FIG. 10 is a diagram for explaining one embodiment of a machining order determination method of cutting data, FIG. 11 is a diagram for explaining a configuration example of block data, and FIG. 12 is a diagram for explaining a machining area that becomes block data. FIG.

In FIG. 10, the block data extraction unit 2
Reference numeral 2 is for extracting adjacent processing target closed region groups as block data from the graphic database 21, and the block data storage unit 23 stores the extracted block data. The block data is, for example, as shown in FIG. 12, processing target closed area groups A, B, C, F, G, which are separated and adjacent to each other at a height Z0 which is not the processing target area.
The data structure is made up of H, and the data structure is, for example, as shown in FIG.
A list 31 of B, C, D, ... And respective area data 32, and area data names A, B, C, of the list 31
Each of D, ... Has a pointer to the address of the area data 32. The area data 32 includes at least the current height information Zs1 and the finished height information Ze for each area data.
1, line segment that is divided into straight lines and curves that represent the shape of the contour line-01
, 02, 03, ... Has element information. If the element information is, for example, a straight line, start point s01, end point e01, s0
2, e02, s03, e03, etc. and start point and linear equation and length, and in the case of a curve, radius and start point, end point, center and other information.

The processing order determination unit 24 uses the block data 2
Area data is extracted from the processing target closed area group in the order of increasing processing height (shallow depth), the expansion area is determined in consideration of the continuity of height and wall connection, and the processing order is determined. Is determined and the tree diagram data 25 of the processing order is created and output. This basic idea is that machining is performed in the order of increasing height of the processing area, and if there is an area of low height adjacent to the processing area, check the connection state of the wall with the adjacent area and add to the processing area. What is included is processed, and what is not is processed afterwards. If there is an open surface and it is not open, post-processing is performed. Regarding the connection state of walls with adjacent regions, if the tangents between the walls are continuous, the adjacent regions are added to determine the processing region, and if they are not continuous, post-processing is performed. Rank management table 26
Is for managing the processing state of each area data when determining the processing order.

Next, a specific example of processing order determination will be described. FIG. 13 is a diagram for explaining tangential continuity of walls, FIG. 14 is a diagram for explaining open surfaces, FIG. 15 is a diagram showing an example of a machining diagram and its machining order tree diagram data, and FIG. 16 is a ranking management table. FIG. 6 is a diagram for explaining an example of FIG.

The continuity of wall connection means that when adjacent regions are connected by walls, the slope of the tangent line at the end points of the shared wall edge data (straight line or arc) is calculated, and if the slopes are the same. It is to be considered continuous. Figure 1
3 When the arc of edge 2 is in contact with the straight line of edge 1 at one point as shown in (a), or the arc of edge 1 and the arc of edge 2 are in contact at one point as shown in (b). If
When the straight line of the edge 1 and the straight line of the edge 2 have the same straight line equation as shown in (c), it is considered that the connection state of the wall with the adjacent region is continuous.

Further, the open surface refers to a place where a part of the edge forming the processing area is open, and as shown in FIG. 14, indicates an edge of a part which does not eventually become a wall in the final finished shape. . In other words, when cutting, it is the edge that the tool may approach. That the open surface is not open (not open) means that the tool cannot approach the open surface. For example, as shown in FIG. 14C, in the processing area 43, it is the open surface 45 that does not become a wall in the final finished shape. However, when cutting this area, the cutting of the processing area 44 is completed first. If not, the tool cannot approach from the open surface 45 of the processing area 43. Therefore, if the cutting of the processing area 44 is not completed, the open surface 45 is not open,
When the cutting of the processing area 44 is completed, the open surface 45
Is open. In the case of pocketing all the walls as shown in FIG. 14D, the tool is approached from the top, so if the cutting of the region including the pocket region is completed, it is treated as open.

In FIG. 15A, A, B, C, D
Are processing areas, and indicate that the range indicated by the contour line is cut to depths Z0, Z3, .... Therefore, in terms of height, Z0 is the highest region where no cutting is performed, and Z15 is the lowest region. When a figure database is created based on this processed drawing, for example, for the area data A, a contour line consisting of straight lines at the top, bottom, left, and right and contour lines consisting of arcs at the upper and left corners are element information, Z0 is the current height, and Z3 is the current height. Is registered as the finishing height.

The determination of the processing order in this processing drawing is performed as follows. First, when the processing area A of the highest Z3 is taken out, the adjacent processing area C and the wall are tangential discontinuities, so the processing area A is post-processed, and the processing area B of the next height Z5 is the same. Since it exists, it will be post-processed. Further, the processing area C of the next height Z10 includes the processing area D which is lower than Z15 and the walls are not adjacent to each other. Therefore, the processing order is 1 in the area including the processing area D of Z15 at the height of Z10.
Determine as rank. Next, the processing area D of Z15 is determined as the second processing order because there is no processing area lower than that. Then, returning to the post-machining machining area A of Z3, the machining area C of the adjacent height Z10 has already been developed and there is no adjacent area outside, so it is decided as the machining rank of second place,
Similarly, the processing area B of Z5 is also determined as the second processing priority. As a result, FIG. 15B shows an example of the created processing order tree diagram data.

In the management table 26, for example, as shown in FIG. 16, for example, a ranking determination flag and a post-processing flag are set in each area data as management information for ranking determination, and the order determination area data and the post-processing area are set. It makes it possible to identify the data. That is, first, all the management information of each area data is set to "0", the highest processing area is taken out, and each area data is determined, and the processing order is 1
The rank determination flag is set to "1" in the management information of the area data C having the first processing rank, and the post-processing flag of the management information of the area data A and B to be post-processed is set to "1". Set each. Similarly, the processing area having the next highest height (sequentially lower) is taken out, the processing order of the processing order is the second rank is determined, and the corresponding order determination flag and post-processing flag are controlled. When there is no lower processing area, the area data A and B having the post-processing flag of "1" are sequentially taken out and the same determination processing is performed. When all the rank determination flags become "1", the determination process ends. The management table 6 may read the list 31 and set a flag.

FIG. 17 shows the flow of the processing order determination processing by the processing order determination method of the cutting processing data as described above.
Is. First, the region having the highest height is extracted from the undeveloped cutting closed region data (step S21), and it is checked whether or not the undeveloped cutting region exists (step S22). If there is no unexpanded cutting area, the process ends, but if it exists (YES), it is further checked whether there is another processing area that is included in the expanded area or is adjacent to it and has the same or lower height (step S23). ). When the corresponding processing area exists (YES), it is further checked whether the tangent line is continuous in the state where the wall is connected to the adjacent area or whether the walls are not adjacent to each other (step S24). As a result, if the tangent lines are continuous or are not adjacent to each other (YES),
After adding the processing region to form a development region, step S23
And the process is repeated (step S25). If the tangents are not continuous and are adjacent to each other (NO), the expanded height area is post-processed, and then the process returns to step S21 to repeat the process. (Step S27). Step S
If there is no corresponding machining area in 23, (N
O), and it is further checked whether the open surface of the development area is open (step S26). As a result, if it is opened (YES), the machining is determined in the developed area (step S28), and if it is not opened (NO), the developed height area is post-processed, and then the step is performed. The process returns to S21 and the process is repeated (step S27).

FIG. 18 is a diagram for explaining the flow of the overall processing order determination processing. When the graphic database is created from the processed drawing, the block data is first read from the graphic database (step S31). Next, it is checked whether or not there is an unexpanded block (step S32), and if there is an unexpanded block, processing order tree diagram data for each of the rough-grinding area, medium-grinding area, and finishing-processing area is created. (Steps S33 to S35). Then, each area in the block data and the tool for each process are selected (step S3
6) Return to step S31 and repeat the same processing until there are no unexpanded blocks.

When there are no undeveloped blocks (NO), the finish surface machining data is input from the graphic database to select the finish surface machining tool (steps S37 to S38), and then chamfering edge data is acquired from the graphic database. Input and select the chamfering tool (steps S39 to S40).

Then, the processing order within each process is maintained,
The machining order is determined in the order in which the tool exchange is minimum and the cutting area is closer to the machining origin (step S41), and the machining order data is output to the machining order file (step S42).

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above embodiment, the tool selection reference file having the first to tenth tool selection reference tool codes is shown, but two or more may be used as long as it can be handled by a plurality of tools, and the number differs depending on the machining type. May be.

[0032]

As is apparent from the above description, according to the present invention, the tool size table for the limited shape, the tool selection reference table, the tool file, and the holder file are provided, and the machining area is referred by referring to each table and file. Obtain the minimum corner diameter of the restricted shape, minimum wall distance, etc. as the restricted shape value,
After that, the search range of the tool diameter is determined, the tool type is searched, the tool is searched according to the determination of the tool type, the holder is set, and the tool and the tool that the holder does not interfere with other areas are determined. The optimum tool selection can be automatically determined by automatically performing the tool type search, determination, and tool search. Therefore, even an operator who does not have the know-how of processing technology can set the optimum tool, and even an unskilled person can easily create the cutting processing data (NC data).

[Brief description of drawings]

FIG. 1 is a diagram for explaining one embodiment of a tool selection method for cutting data according to the present invention.

FIG. 2 is a diagram for explaining a process code included in a graphic database.

FIG. 3 is a diagram showing an example of a tool diameter table for limited shapes.

FIG. 4 is a diagram showing an example of a tool selection reference table.

FIG. 5 is a diagram showing an example of a tool file.

FIG. 6 is a diagram showing an example of a holder file.

FIG. 7 is a diagram for explaining a limit shape value.

FIG. 8 is a diagram for explaining a processing flow of a tool selection method for cutting data according to the present invention.

FIG. 9 is a diagram for explaining a tool resetting method.

FIG. 10 is a diagram for explaining one embodiment of a processing order determination method for cutting processing data.

FIG. 11 is a diagram for explaining a configuration example of block data.

FIG. 12 is a diagram for explaining a processing area that becomes block data.

FIG. 13 is a diagram for explaining tangential continuity of a wall.

FIG. 14 is a diagram for explaining an open surface.

FIG. 15 is a diagram showing an example of a processed drawing and its processing order tree diagram data.

FIG. 16 is a diagram for explaining an example of a ranking management table.

FIG. 17 is a diagram showing a flow of processing order determination processing by a processing order determination method of cutting processing data.

FIG. 18 is a diagram for explaining the flow of overall processing order determination processing.

[Explanation of symbols]

1 ... Machining area determination unit, 2 ... Machining type determination unit, 3 ... Limited shape value calculation unit, 4 ... Tool type determination unit, 5 ... Tool determination unit, 6
... Tool diameter resetting section, 7 ... Graphic database, 8 ... Restriction shape compatible tool diameter table, 9 ... Tool selection reference table, 1
0 ... Tool file, 11 ... Holder file

Claims (5)

[Claims] 1. A tool type and a tool diameter are searched after a machining area and a machining type are determined based on a database composed of area data having line segment information and machining height information forming a contour shape for each machining area. It is a tool selection method of cutting processing data that determines a tool, and a limited shape corresponding tool diameter table that has information such as a limited dimension of a limited machining area, a reference diameter, and a vertical diameter, and a plurality of machining types (process codes). It has a tool selection criteria table with tool selection criteria, tool code, tool abbreviation, tool material, tool shape, holder code, and holder file with holder diameter information. Determine the diameter and minimum distance between walls as the limiting shape value, then determine the tool radius search range to search for the tool type, and determine the tool type according to the tool type. A tool selection method for cutting data characterized by searching for and setting a holder to determine a tool and a tool in which the holder does not interfere with other areas. 2. The cutting according to claim 1, wherein when the tool type cannot be determined by the tool selection reference table, the tool is determined by the tool selection reference table assuming that the highest priority ideal diameter tool exists. Tool selection method for machining data. 3. When the tool does not exist as a result of the tool search,
Alternatively, when the tool and the holder interfere with other areas, the tool diameter and the tool diameter are reset by searching for the tool type and the tool. 4. The tool selection method for cutting data according to claim 3, wherein in the tool diameter resetting, a standard diameter is searched, and then a value other than the standard diameter is searched. 5. The tool selection method for cutting processing data according to claim 3, wherein in the tool diameter resetting, the lower limit value from the reference diameter is searched with priority over the lower limit value from the reference diameter.