JP2949730B2 - Tool interference check device of numerical control processing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a tool interference checking device for a numerically controlled processing machine, and more particularly, to a processing portion such as a cutting edge of a numerically controlled processing machine and a workpiece which is gripped by the processing portion. The present invention relates to a tool system including a processing unit drive mechanism that moves relatively to a tool and a device that checks interference between a workpiece processed by the processing unit.

[Prior art] Conventionally, numerically controlled processing machines (hereinafter referred to as NC processing machines)
In order to avoid the interference between the tool and the workpiece, the tool movement path in
It is calculated based on the tool shape information of the C processing machine. As an apparatus for avoiding this interference, Japanese Patent Application Laid-Open No. 62-208861 discloses a three-dimensional shape of a work, a part of a tool and a machine tool (hereinafter referred to as a tool system) on a screen of a cathode ray tube of a graphic display apparatus. ) Is drawn according to the tool path, and the position of the visual viewpoint is changed to display the two-dimensionally and visually check the spatial interference of the tool system with the workpiece. ing.

[Problem to be Solved by the Invention] However, in the above system, CA
This is the shape (final product shape) after the shape data of the work created by D is machined, and the casting allowance for the work and the cutting allowance during machining (hereinafter referred to as the expected allowance) are not considered. At the time of actual machining, as shown in FIG. 10, interference with the tool K system (indicated by blacking out the interference portion) may occur at the portion of the expected margin M of the work WK. Therefore, the NC machine stops or the tool or the like is damaged due to the interference, thereby lowering the operation rate of the production system and lowering the machine accuracy of the NC machine. In addition, the workpiece is misaligned due to the impact at the time of interference, which is a cause of processing defects.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to correctly recognize interference with a tool even for a prospective margin.

[Means for Solving the Problems] A tool interference check device of a numerically controlled processing machine according to the present invention comprises:
As illustrated in FIG. 1, a tool system including a processing part such as a cutting blade of a numerical control processing machine, and a processing part driving mechanism that grips the processing part and moves relatively to a workpiece WK; Work processed by the part
A tool for checking interference with WK, wherein the tool system is represented by a solid model which is substantially equivalent to its actual shape and divides a space into a portion included in the actual shape and a portion not included in the actual shape. System representation means M1, a part of the tool system, which is divided and represented on the solid model, and a work part classified according to a work order of the work, and a machining operation of the machining part on the work part For the tool system portion set based on the above, the tool system extended expression means M2 which expands and expresses the solid model by at least an amount corresponding to the expected allowance of the work, and at least the outer shape of the work WK When a part intersects the solid model represented by the tool system extended expression means M2, interference determination means M3 for determining that interference between the tool system and the work WK occurs. And the spirit that was example.

[Operation] The tool interference checking device of the numerically controlled machining machine of the present invention having the above-described configuration is configured such that the tool system is represented by
A tool that is represented by a solid model that divides the space into a part that is substantially equivalent to the substance shape and a part that is not included in the substance shape and a part that is not included, and that is divided and represented on the solid model by the tool-based extended representation unit M2 A part of the system, the work
The solid model is extended at least for the tool part set based on the work part classified according to the processing order of WK and the machining operation of the processing part with respect to the work part by at least the expected allowance of the work WK. To express.

Here, examples of the work part classified according to the processing order of the work WK include an unprocessed part, a processed part, a processed part, a non-processed part, and the like.

Examples of machining operations include approach to move the tool toward the work WK, cutting to move the tool in the horizontal direction along the work WK, and escape to remove the tool from the work WK, for example, To change the position of the tool.

Note that the tool system part is a component of the tool system that is divided on a solid model according to, for example, movement (translational movement, rotational movement, and the like) and function. For example, a cross rail, a spindle head, a spindle, an attachment, The tool gripping portion, the tool non-cutting edge portion, the tool cutting edge portion, and the like correspond to the respective portions. In addition,
For example, a tool is not divided into parts like a tool is divided into a non-tool cutting edge portion and a tool cutting edge portion.

Then, when at least a part of the outer shape of the workpiece WK intersects with the extended solid model, the tool interference checking device uses
It is determined that interference with WK has occurred.

[Embodiment] In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a tool interference check device for a numerically controlled machining machine according to the present invention will be described below.

FIG. 2 is a block diagram showing a schematic configuration of a tool interference check device (hereinafter, simply referred to as a check device) of a numerically controlled processing machine as one embodiment. The check device includes an electronic control device 20 that outputs NC data to the NC processing machine 10.
The electronic control unit 20 constitutes an arithmetic and logic operation circuit from the well-known CPU 21, RAM22, and ROM23, and outputs external input / output signals to the CPU2.
It comprises an input / output port 24 for converting into one processable signal and a bus 25 for connecting these. The input / output port 24 has a three-dimensional graphic display 30 for displaying a work and a three-dimensional shape of a tool system to be described later, a keyboard 32 for inputting various conditions and the like, and shape data of the work created by a CAD system (not shown). An external storage device 34 that stores various data of the NC processing machine 10 and a printer 36 that prints interference check results and the like are connected.

Next, the portal-type NC processing machine 10 for which the check device performs the interference determination will be described. NC processing machine 10
As shown in the figure, a table 11 on which a workpiece WK is placed and movable in the direction of the arrow x, a cross rail 12 movable in the direction of the arrow w, and a spindle head 13 sliding on the cross rail 12 in the direction of the arrow y. And a spindle 14 attached to the spindle head 13 and movable in the direction of the arrow z, and by driving them, the attachment 15 attached to the spindle 14 and the tool 5
0 (comprising the tool non-cutting edge portion 17 and the tool cutting edge 18) is arranged at a predetermined position on the workpiece WK surface along the set tool path. The cross rail 12, the spindle head 13, the spindle 14, the attachment 15, the tool gripper 16, the tool non-cutting edge 17, and the tool cutting edge 18 are collectively referred to as a tool system 40.
Numerals 18 correspond to parts of the tool system 40, respectively. FIG.
FIG. 2 is a perspective view showing the tool system 40.

The electronic control unit 20 expresses the actual shape of the tool system 40 in a solid model based on the NC processing machine information, tool information, and the like stored in the external storage device 34. That is, the space is divided into a part included in the actual shape of the tool system 40 and a part not included in the actual shape, and a model is created that can clearly distinguish whether any point in the space is included in either of them. is there. And
Using this solid model, the trajectory of the tool system 40 when the tool 50 moves on the tool path is represented (hereinafter, this trajectory is referred to as a trajectory solid).

As shown in FIG. 5, the tool system 40 is represented by a combination of three types of partial solids of a truncated cone a (including a cylinder), a truncated pyramid b (including a prism), and a sphere c. Is moved in the direction of the arrow, and is represented by a combination of five types of basic solids obtained by adding oblique cylinders and oblique prisms e to them.

On the other hand, the shape of the work WK is expressed by approximating a straight line group based on a three-dimensional wire frame model created by a press die design CAD system (not shown).

As shown in FIG. 6, the electronic control unit 20 determines the intersection with the straight line group L approximating the shape of the work WK for each basic solid R of the represented trajectory solid, and when the intersection is confirmed. Determines that interference occurs between the intersections C1 and C2. In order to determine this interference, as shown in FIG. 7, the solid model S is expanded for each part of the tool system 40 by an amount corresponding to the expected allowance of the work WK according to the machining state of the work WK. I do.

Next, a process in which the electronic control unit 20 performs the interference check by extending the solid model of the tool system 40 and creates the NC data will be described with reference to the flowchart of FIG.

First, the shape data of the workpiece WK created by the CAD system, NC processing machine information (specifications of the shape and dimensions of the NC processing machine 10), and tool information (specifications of the shape and dimensions of the tool 50) , Processing method information (specifications such as cutting allowance, rough / finish cut), and work information (specifications such as casting allowance and material) are stored in an external storage device 34.
Then, processing information is added, and processing such as determination of the NC processing machine 10, the tool 50 to be used, determination of a processing portion, determination of a processing method, and the like is performed (step 100). Next, a tool path as processing data is calculated, and processing operation information (approach, cutting, escape, movement) is allocated to the tool path, and processing sequence information is allocated (step 110). From these information,
The following processing is performed.

First, information on a tool to be used for each processing portion of the work WK is searched (step 120). Subsequently, a search is made for possible portions of the unprocessed portion and the non-processed portion for each processed portion of the work WK, and an extension amount of the solid model of the tool system 40 for each portion is obtained (step 130). Then, the trajectory solid of the solid model of the tool system 40 expanded based on the expansion rule described later is created on the RAM 22 (step 140). next,
Interference is determined by detecting the intersection between the three-dimensional wireframe model of the work WK created by the CAD system and the solid trajectory of the solid model of the tool system 40 (step 150).

This interference determination is performed by performing the processing of steps 160 to 230 in all the parts of the tool system 40 (the tool non-cutting edge part 17, the tool holding part 16
), Four types of machining operations (approach, cutting, escape, movement) of the tool 50, four types of parts of the work WK (unprocessed part, processed part, processed part, non-processed) The determination is repeated until interference determination is performed on all the processed parts of the workpiece WK. The parts of the tool system 40, the four types of machining operations of the tool 50, and the four types of parts of the work WK, which are the targets of the interference determination, will be described in detail in an extension rule described later.

When these interference determinations are completed, the interference part is displayed as a warning on the three-dimensional graphic display 30 and a list of the interference parts is output by the printer 36 (step 24).
0). Based on this warning display, the part programmer corrects the tool path using the keyboard 32 (step 25).
0). Then, use the corrected tool path as NC data
Output to the processing machine 10 (step 260), and this routine ends.

Next, a rule (hereinafter simply referred to as an extension rule) for extending a solid model (hereinafter simply referred to as a model) of the tool system 40 will be described with reference to FIG.

As shown in FIG.
Each part of the work WK is classified into four types, ie, an unprocessed part W1, a processed part W2, a processed part W3, and a non-processed part W4, according to a processing order relationship. Then, for each of these classified machining operations and each part of the work WK, the extension of the model is set for each part of the tool system 40 (the tool non-cutting edge part 17, the tool gripping part 16, etc.). Note that the work WK is
It is processed in the order of 2, W1, and the non-processed portion W4 is not processed.

Next, regarding the extension of the model, the unprocessed portion W1 of the workpiece WK
Will be described in order.

When the tool 50 approaches the machined part W2, the contact between the unmachined part W1 and the tool system 40 is considered to be interference, and the model of the entire tool system 40 is extended with the cutting allowance of the unmachined part W1 as a possible margin ( Pattern A). Hereinafter, the extended model is indicated by a broken line. When the tool 50 is cutting the compound portion W2, the contact between the unprocessed portion W1 and the tool cutting edge portion 18 is not considered as interference unless it comes into contact with the final product shape, and the tool system other than the tool cutting edge portion 18 is not considered. 40
Is extended using the cutting allowance of the unprocessed portion W1 as the expected allowance (pattern B). When the tool 50 escapes from the machined portion W2, the contact between the unmachined portion W1 and the tool system 40 is regarded as interference as in the case of the pattern A, and the model of the entire tool system 40 is expanded (pattern C).

In the processing part W2, since the contact between the processing part W2 and the tool cutting part 18 is cutting, the approach, cutting, and relief processing operations do not create a three-dimensional trajectory of the tool cutting part 18, and other tool systems No expansion of 40 models (patterns D, E, F). The interference (so-called bite) between the processing part W2 and the tool cutting blade part 18 is as follows.
This is prevented because it is taken into account when calculating the tool path.

In the machined part W3, the contact between the machined part W3 and the tool system 40 is considered as interference, and the machined part W3 has the final product shape. Is not extended (patterns G, H, I).

When moving in the unprocessed portion W1, the processed portion W2, and the processed portion W3 (moving paths are indicated by arrows), contact between the tool system 40 and each part of the work WK is considered as interference, and the entire tool system 40 is considered. Is extended (pattern J).

In the non-processed portion W4, the non-processed portion W4
Considering the contact between the tool W and the tool system 40 as interference, the model of the entire tool system 40 is expanded using the casting cost of the work WK as the expected cost (pattern K).

As described above, this expansion rule sets the expansion of the model for each part of the tool system 40 for each part of the work WK according to the machining operation of the tool 50.

The checking device of the present embodiment described above expresses the tool system 40 by a solid model, and in the part of the tool system 40 that is divided and expressed on the solid model, according to the machining order of the workpiece WK. For a part of the tool system 40 set based on the part of the work WK to be classified and the tool system 40 machining operation for the part of the work WK, the solid model is extended by at least an amount corresponding to the expected allowance of the work WK. Since it is expressed, the interference with the tool system 40 can be recognized even in the casting allowance of the work WK, the cutting allowance during machining, and the like. Therefore, the NC processing data created based on the recognized interference becomes highly reliable. Therefore, the NC processing machine 10 is not stopped or damaged, the operation rate of the production system is improved, and the machine accuracy of the NC processing machine 10 is maintained. Further, there is no processing defect due to the displacement of the work WK. Further, since the tool system 40 is represented by a solid model, the shape changing operation is easy.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various manners without departing from the gist of the present invention.

Effects of the Invention As described in detail above, according to the tool interference check device of the numerically controlled processing machine of the present invention, the tool system is represented by a solid model, and the parts of the tool system that are expressed separately on the solid model. A solid model corresponding to at least a portion corresponding to the expected cost of the work is set for the tool part set based on the work part classified according to the work order of the work and the processing operation of the processing part with respect to the work part. Therefore, the interference with the tool system can be recognized even in the casting allowance of the work or the cutting allowance during the machining. Therefore, the NC processing data created based on the recognized interference becomes highly reliable. Therefore, the NC processing machine is not stopped or damaged, the operation rate of the production system is improved, and the machine accuracy of the N child processing machine is maintained.
In addition, there is no processing failure due to a positional shift of the work. Further, since the tool system is represented by a solid model, a shape changing operation is easy.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a basic configuration of the present invention, FIG. 2 is a block diagram illustrating a schematic configuration of a tool interference checking device of a numerical control processing machine, FIG. 3 is a perspective view of an NC processing machine, FIG.
The figure is a perspective view of a tool system, FIG. 5 is an explanatory view showing a trajectory solid,
FIG. 6 is an explanatory diagram showing a method of judging interference, FIG. 7 is an explanatory diagram showing extension of a solid model, FIG. 8 is a flowchart showing a routine for creating NC data, and FIG. FIG. 10 is an explanatory diagram showing the occurrence of interference in the prior art. 10 …… NC processing machine, 20 …… Electronic control device 40 …… Tool system, 50 …… Tool WK …… Work

Continuation of the front page (72) Inventor Koichi Ino 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (56) References JP-A-62-208861 (JP, A) JP-A-63-6605 (JP, A) JP-A-62-173140 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G05B 19/4069

Claims (1)

(57) [Claims] 1. A tool system including a processing part such as a cutting blade of a numerical control processing machine, a processing part driving mechanism that grips the processing part and moves relatively to a work, and is processed by the processing part. A tool for checking interference with a workpiece, wherein the tool system is represented by a solid model which is substantially equivalent to its actual shape and divides a space into a portion included in the actual shape and a portion not included therein. System representation means, a part of the tool system which is expressed separately on the solid model, a work part classified according to a processing order of the work, and a processing operation of the processing part on the work part. Tool system extended expression means for expanding and expressing the solid model by at least a portion corresponding to the expected allowance of the work, with respect to the tool system portion set based on the external shape of the work Tool interference of a numerically controlled machining device comprising: interference determination means for determining that interference between the tool system and the work occurs when at least a part of the tool crosses the solid model expressed by the tool system extended expression means. Check device.