JPH09244721A - Tool interference check method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and highly precisely check the interference of a manufacture form and a work tool by obtaining the outermost form of a work tool system when working is executed in accordance with a work method plan at every basic form feature, comparing the outermost form and the designed product form and judging the presence or absence of interference. SOLUTION: A track operation means 36 obtains the outermost track of the work tool when working is executed for the respective basic form features in accordance with the work method plan which is previously decided. A form operation means 38 generates the three-dimensional model of the outermost form where at least a part of the work tool system containing the work tool passes when the work tool is moved along the outermost track. The tool interference for overlapping the final three-dimensional model of the outermost form with the whole three-dimensional model of the product form generated by the product form generation means 32, and for displaying an overlap part on a display device as an interference part by an interference area operation means 42 checks the presence or absence of interference with a product part except for a work part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool interference check method for checking the interference between a product shape and a machining tool at the design stage of the product shape.

[0002]

2. Description of the Related Art From designing to processing of various product shapes such as the shape of a press die, generally, the steps shown in FIG. 9 are performed. Step R1 is a designing process, which normally uses a parametric CAD (Computer Aided Design) device to appropriately design a plurality of types of predetermined basic shape features to design a product shape. . At this stage, the judgment of the interference between the product shape and the processing tool is made only by using the document peculiar to the designer and the summary of the danger range of the interference, and is not always accurate. Steps R2-R11 are CAM (Co
mputer Aided Manufacturing) device, etc., and in step R2, the product designer sees the product shape sent from the CAD device online, etc., and the processing designer considers his past experience etc. Consider processing tools, processing time, overall production schedule, etc. In step R3, the machining designer also visually checks on the screen for interference between the product and the machining tool system (including the quill, chuck, etc.), and if it is determined that there is interference (YES in R4), the machining method in step R5. It is determined whether or not can be changed. If the machining method can be changed, the process returns to step R2 to change the tool to be used, etc. If the machining method cannot be changed, step R12 is performed.
In this case, the processing operator manually performs the processing.

If the determination in step R4 is NO, that is, if the machining designer determines that there is no interference, step R6 is executed to create CL, which is the movement path of the machining tool when machining the product. . In step R7, the machining tool is moved (simulation) in accordance with the CL data created in step R6 to check the interference between the machining tool and the product. The CL calculation and interference check are automatically performed by the CAM device. If there is no interference, C at step R11
The L data is converted to NC data and output to the NC machine tool. If interference occurs, it is determined in step R9 whether CL data can be corrected. If correction is possible, step R1 is performed.
Correct with 0 and execute step R11. If the CL data cannot be corrected, the step R5 is executed.

[0004]

However, in such a conventional method, there is a case where machining is required to be performed manually at the machining site (when R5 is NO), which is a burden on the operator at the machining site. Was great. It is possible to return to the design stage of step R1 and change the product shape itself, but generally product design is completed (drawing).
Since the production of rough materials (castings, etc.) for products such as press dies is started at this stage, it is not preferable to change the product shape after drawing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily and highly accurately check the interference between a product shape and a processing tool at the design stage of the product shape. To be able to do it.

[0006]

In order to achieve the above object, the present invention provides a machining tool for machining a product when designing the product shape using a plurality of types of predetermined basic shape features. A tool interference check method for examining interference with the product shape, comprising: (a) a design step of designing a product shape using the basic shape feature; and (b) a predetermined machining method for each basic shape feature. Outermost shape calculation step for obtaining the outermost shape of the processing tool system including the processing tool when performing the processing according to the plan, and (c) comparing the outermost shape and the product shape designed in the design step. And an interference determination step of determining the presence or absence of interference.

[0007]

As described above, according to the present invention, it is possible to check the presence or absence of the interference between the product shape and the processing tool at the designing stage of the product shape, so that the interference including the modification of the product shape can be avoided. This makes it possible to eliminate troublesome machining due to manual operation at the machining site. In particular, the machining method plan is defined for each basic shape feature used when designing the product shape, and when machining is performed according to the machining method plan, the outermost shape of the machining tool system is sought to determine the interference with the product shape. Since it is designed to determine the presence or absence of interference, at least the interference check can be easily performed with high accuracy without requiring skill, and in comparison with the case of performing the interference check by obtaining CL (tool movement path). It can be done quickly in a short time.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Here, the basic shape feature is a unit shape when designing a product shape, and for example, a plurality of types, such as a convex seat, a recessed seat, and a seat with a wall, are formed according to the shape of the product to be manufactured. Is defined, for example, parametric C
In the AD device, the design work can be performed only by selecting a basic shape feature, arranging it at a predetermined position, and inputting parameters such as dimensions and angles of each part.

The machining method plan is set in a storage device as an attribute of the basic shape feature, and various types of machining tools, arbors, quills, and the like, which are related to interference during machining, such as types, shapes, and dimensions. It is defined including the information of. This processing method plan is determined by a processing design expert or an actual processing operator, and is set for each step when processing is performed in a plurality of processing steps. It is also possible to set a plurality of processing method plans according to the material of the workpiece, the processing efficiency, the required processing accuracy, etc., so that the designer of the product shape can arbitrarily select it.

The outermost contour shape calculating step includes, for example, (a) a trajectory calculating step for obtaining an outermost contour locus of a machining tool when machining is performed according to a machining method plan predetermined for each basic shape feature, and (b) When the machining tool is moved along the outermost contour locus, a shape calculation step of determining an outermost contour shape through which at least a part of the machining tool system including the machining tool passes is included. The outermost contour locus is the outermost side when processing the product shape related to the basic shape feature,
That is, the locus of the machining tool at the boundary position between the portion to be machined and the portion not to be machined, for example, the centerline locus of the machining tool in a state where the machining tool is in contact with the inner wall surface of the concave seat to be machined in concave seat machining. It can be obtained two-dimensionally from the shape of the part and the radial dimension of the processing tool. Also,
The machining tool system includes all members related to the interference with the product shape during machining, and generally includes arbor and quill. Find the outer shape. In the case of having a plurality of machining steps, the union of the outermost contour shapes of the machining tool system in each machining step may be obtained and used as the final outermost contour shape.

The interference determining step is configured to superimpose the outermost contour shape of the machining tool system and the product shape by, for example, a CAD function, and display the overlapping portion (product set) as an interference area.

Further, an apparatus capable of suitably implementing such a tool interference checking method is to create a product shape with a three-dimensional model using a plurality of types of predetermined basic shape features, and to use a machining tool for machining the product. A product shape designing device for checking interference with the product shape,
(a) a storage device that stores the plurality of types of basic shape features and a predetermined processing method plan for each basic shape feature; and (b) a selection from the plurality of types of basic shape features by an input device. Product shape creating means for creating a three-dimensional model of a product shape by using the selected basic shape feature, and (c) processing method plan setting for reading and setting a processing method plan for the selected basic shape feature from the storage device. And (d) outermost contour shape creating means for creating a three-dimensional model of the outermost contour of a machining tool system including a machining tool when machining is performed according to the machining method plan set by the machining method plan setting means. ,
(e) A parametric CAD device is preferably configured by including an interference area calculation unit that superimposes the outermost three-dimensional model and the three-dimensional model of the product shape and displays an overlapping portion as an interference area. Used. Further, the outermost contour shape creating means, for example, (d-1) trajectory calculating means for determining the outermost contour trajectory of the machining tool when machining is performed according to a machining method plan predetermined for each of the basic shape features, and (d -2) a shape calculation means for creating a three-dimensional model of the outermost contour shape through which at least a part of the machining tool system including the machining tool passes when the machining tool is moved along the outermost contour locus. Composed.

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram for explaining the basic configuration of a parametric CAD device 10 as a product shape designing device capable of suitably implementing the method of the present invention. The main components such as a central processing unit 12 and a ROM connected by a data bus line are shown. A storage device 14 and an auxiliary storage device 16 such as a RAM are provided, and the central processing unit 12 includes an auxiliary storage device 16
3D model creation in accordance with a program previously stored in the main storage device 14 while utilizing the temporary storage function of
Various arithmetic processes such as enlargement, reduction, movement, rotation, and logical operations such as sum, difference, product, etc. are performed, and the procedure for creating figures and the numerical values of each parameter are stored and temporarily stored. After creating a figure, it has a function to automatically create a modified figure by the same procedure simply by changing the numerical value of the parameter. The display device 18 displays an image of a cathode ray tube, a liquid crystal panel, or the like, and displays the above three-dimensional model and a selection menu that allows the designer to easily select the processing contents. , Using an input device such as dial 24,
The data required for creating the three-dimensional model is input, the three-dimensional model is enlarged, reduced, moved, or rotated, the three-dimensional model is modified by changing the numerical values of the parameters, and the data is displayed on the display device 18. Various operations can be performed such as selecting a desired menu from the selection menu. Further, the printer 26 is for printing the display content of the display device 18 and the shape data of the three-dimensional model, and the network controller 28 is for connecting to a workstation, a machine tool or the like and for transmitting information. Is.

The parametric CAD device 10 has the following:
It has the functions shown in the block diagram of FIG. The database 30 stores a plurality of types of basic shape features and a machining method plan determined in advance for each basic shape feature. For example, the database 30 is configured as shown in FIG. It is stored in. The basic shape feature (new feature) is shown in FIG.
(A) of the concave seat, Figure 5 (a) of the convex seat, Figure 6 (a)
As shown in the figure, the processing method plan is
As shown in (b), various information related to the interference with the product at the time of machining, such as the machining process up to finishing and the type, shape, and dimensions of tools, arbor, quill, etc. used for each machining process, are displayed. Contains. The processing method plan is defined by processing design specialists and actual processing workers, and in addition to the standard processing method plan shown in the figure, the material of the workpiece, processing efficiency, requirements Multiple processing method plans are set for each basic shape feature according to processing accuracy, etc.
It can be arbitrarily selected and set by the designer. The standard processing method plans shown in (b) of FIGS. 4 to 6 are cases in which processing is performed in two steps, a rough processing step and a finishing processing step, but a processing method plan including three or more processing steps is provided. Of course, it is possible to set.

The product shape creating means 32 reads the basic shape features selected by the designer from the database 30 and creates a three-dimensional model of the product shape based on the parameters such as the dimensions input by the keyboard 20 or the like. At the same time, it is displayed on the display device 18. The processing method plan setting means 34 reads the processing method plan related to the selected basic shape feature from the database 30. At first, the standard processing method plan is automatically set and displayed on the display device 18. According to the operator's selection operation, another processing method plan regarding the basic shape feature is read from the database 30 and displayed on the display device 18. The set machining method indicates the contents of the tool library, machining condition library, and machining machine library shown in FIG.

The locus calculation means 36 finds the outermost locus of the machining tool when machining is performed according to a machining method plan previously determined for each of the basic shape features, and is an xy two-dimensional shape perpendicular to the axis of the tool. It is designed to be calculated on a plane. The locus calculation means 36 starts execution when the design operator inputs an operation to check the tool interference. The outermost contour locus is the locus of the machining tool at the outermost position when machining the product shape relating to the basic shape feature, that is, at the boundary position between the portion to be machined and the portion not to be machined. As shown in (), the centerline loci 52a and 52b of the machining tool in a state where the machining tool is in contact with the inner wall surface 50 of the concave seat to be machined are offset from the inner wall surface 50 inward by the radius dimension of the rotary machining tool. It is the position where (c ₁ ) is for rough machining, (c ₁ )
₂ ) is the case of Soko finishing, which is closer to the inner wall surface 50 because the diameter of the machining tool is smaller in finishing. In the convex seat processing of FIG. 5, as shown in (c), the outer peripheral edge 54 of the convex seat and the centerline trajectory 56 as the outermost contour trajectory.
a, 56b, and in the seating with a wall in FIG. 6, (c)
On the wall side, as shown in Fig. 7, the position is offset inward from the wall surface 58 by the radial dimension of the rotary machining tool, and on the edge 60 side opposite to the wall, the position corresponding to the edge 60 is the center of the outermost locus. The line loci 62a and 62b are obtained. In FIG. 5 and FIG. 6 as well, (c ₁ ) shows the case of rough machining and (c ₂ ) shows the case of rough finishing, but since the diameter dimensions of the machining tools are the same, center line locus 56a and 56b, 62a and 62b have the same shape.

The shape calculation means 38 is a unit for moving at least a part of a machining tool system including the machining tool when the machining tool is moved along the outermost contour locus (center line trajectories 52, 56, 62). The three-dimensional model of the outer shape is created, and constitutes the outermost shape creating means 40 together with the trajectory calculating means 36. The machining tool system includes all members related to interference with the product shape at the time of machining, and includes an arbor and a quill. In the shape calculation means 38, the machining method set by the machining method plan setting means 34. The outermost contour shape is obtained by moving the entire machining tool system including the arbor and quill defined in the plan along the outermost contour locus. A three-dimensional model 64a and 64b indicated by a dotted line in FIG. 4D, and a three-dimensional model 66 indicated by a dotted line in FIG. 5D.
a, 66b, the three-dimensional model 68 shown by the dotted line in FIG.
Symbols a and 68b represent the outermost contours of the machining tool system in the case of rough machining and rough finishing, respectively. When machining is performed in a plurality of machining steps as described above, the shape calculating means 38 also adds (union) all the outermost contour shapes of the machining tool system in each machining step to calculate the maximum of all machining tool systems. Find the outer shape. Three-dimensional models 64c and 6 of FIGS.
6c and 68c represent the outermost contours of the entire machining tool system, and these three-dimensional models 64c, 66c and 68 are shown.
c is displayed on the display device 18. 5 and 6
Then, since the tool, arbor, and quill of each processing step have the same shape, the three-dimensional models 66a to 66c and 68a to 68 are included.
c have the same shape.

The interference area calculating means 42 superimposes the final three-dimensional models 64c, 66c and 68c of the outermost contour shape and the entire three-dimensional model of the product shape created by the product shape creating means 32, The overlapping portion (product set) is displayed on the display device 18 as an interference area. This tool interference is to check not only the interference of the arbor and quill in the processing section but also the presence or absence of interference with the product section other than the processing section.

Next, the procedure for designing a predetermined product shape such as a press die using the parametric CAD device 10 will be described with reference to the flowchart of FIG.

In step S1 of FIG. 7, the design worker appropriately arranges the basic shape features (new features) set in the database 30 and inputs parameters such as dimensions, thereby producing the product shape forming means. A three-dimensional model of the product shape is created by 32. This step S1 is a design process. Step S
In 2, the processing method plan relating to the basic shape feature used to create the product shape is set by the processing method plan setting means 34. Initially, the standard processing method plan is automatically set, but it can be changed to another processing method plan by the designer.

After that, when the design operator inputs an operation to perform the tool interference check, the interference check in step S3 is executed. Specifically, the interference check in step S3 is performed according to the flowchart shown in FIG. 8. In step S3-1, the trajectory calculating means 36 causes the tool center line trajectories 52a, 52b, 56a, for each machining step.
56b, 62a, 62b, etc. are calculated, and step S3-
2, the outer shape of the three-dimensional model 64a, 64b, 66a, 66b is calculated by the shape calculation means 38 for each machining step.
68a, 68b, etc. are created. Step S3-
In the case of 3, the shape calculation means 38 similarly performs 3 of each processing step.
Dimensional models 64a and 64b, 66a and 66b,
The union of 68a and 68b is obtained, and the final three-dimensional models 64c, 66c, 68c are created. These steps S3-1 to S3-3 are the outermost contour shape calculation step, and the step S3-1 therein is the trajectory calculation step, step S3-.
2 and S3-3 are shape calculation steps.

In the next step S3-4, the interference area calculation means 42 causes the three-dimensional models 64c, 66c, 6
8c, etc. and 3 of the product shape created in step S1.
The three-dimensional model and the three-dimensional model are associated with each other and overlapped, and the overlapping portion (product set) is displayed on the display device 18 as an interference region. The display of the interference area indicates the presence or absence of interference, and step S3-4 is an interference determination step.

As a result, the interference check in step S3 is completed, and in the next step S4, the designer determines whether or not the interference is occurring while looking at the screen of the display device 18, and the interference is occurring. If not, step S6 is executed. In step S6, CL, which is the movement path of the processing tool when processing the product based on the processing method plan set in step S2, is created, and in step S7, the CL data is converted into NC data and the NC of the processing site is converted. Output to machine tools etc. Further, when the determination in step S4 is NO, the product design is finished, and the production of the rough product material (casting or the like) is started based on the product shape.

On the other hand, if the determination in step S4 is YES, in step S5 the design operator determines whether or not to change the design of the product shape based on the degree of interference, location, etc., and designs from the product shape. When it does again, step S1 and subsequent steps are repeated. If the design is not changed, step S2
Then, the processing method plan is changed and steps S3 and thereafter are executed.

Incidentally, such a tool interference check is
The processing is performed for each of a plurality of machining parts (product shape features) forming the product shape, and when it is determined that no tool interference occurs in all the machining parts, the process proceeds to step S6 and the subsequent steps.

Here, the parametric CAD of this embodiment is used.
The apparatus 10 can check the presence or absence of interference between the product shape and the processing tool at the designing stage of the product shape, and if there is interference, it is possible to avoid the interference including the modification of the product shape. The troublesome machining due to manual operation at can be eliminated. In particular, the processing method plan is defined for each basic shape feature used when designing the product shape,
Since the outermost shape of the processing tool system when performing processing according to the processing method plan is determined to determine whether or not there is interference with the product shape, at least interference check can be performed easily without requiring skill. It can be performed with high accuracy, and can be performed quickly in a short time as compared with the case where CL (tool movement path) is obtained and interference check is performed.

Further, since the interference check is performed at the design stage of the product shape in this way, the interference check after CL calculation is not always necessary, and CL data and N
The time required to create C data is greatly reduced. Even in an actual processing site, the amount of post-processing for manual operation and correction is greatly reduced.

The steps S6 and S7 can be carried out by using the parametric CAD device 10 of this embodiment, but may be carried out in a separate process by using a CAM device or the like. Of course.

Although the embodiment of the present invention has been described in detail with reference to the drawings, this is merely an embodiment of the present invention, and the present invention includes various modifications based on the knowledge of those skilled in the art.
It can be implemented in an improved manner.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of a parametric CAD device capable of suitably implementing the method of the present invention.

FIG. 2 is a block diagram illustrating the function of the device of FIG.

FIG. 3 is a diagram for explaining the contents of the database in FIG.

FIG. 4 is a diagram for explaining a machining method plan in the case of designing a concave seat shape using the apparatus of FIG. 1, and an operation for obtaining the outermost contour shape of a tool during machining.

5A and 5B are diagrams for explaining a machining method plan when a convex seat shape is designed using the apparatus of FIG. 1 and an operation for obtaining an outermost contour shape of a tool during machining.

6A and 6B are diagrams illustrating a machining method plan when a seated shape with a wall is designed using the apparatus of FIG. 1 and an operation for obtaining an outermost contour shape of a tool during machining.

7 is a flowchart illustrating an operation and a procedure when designing a product shape using the apparatus of FIG.

FIG. 8 is a flowchart illustrating specific contents of the interference check in step S3 in FIG.

FIG. 9 is a flowchart illustrating a series of conventional processes from design of product shape to processing.

[Explanation of symbols]

 64c, 66c, 68c: Three-dimensional model (outermost shape) Step S1: Design process Steps S3-1 to S3-3: Outermost shape calculation process Step S3-4: Interference determination process

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroyasu Maruyama 2-6-36 Daimyo, Chuo-ku, Fukuoka, Fukuoka Prefecture

Claims (1)

[Claims] 1. A tool interference check method for checking interference between a processing tool for machining a product and the product shape when designing a product shape using a plurality of types of predetermined basic shape features, A design step of designing a product shape using the basic shape feature, and an outermost contour for obtaining an outermost contour shape of a machining tool system including a machining tool when machining is performed according to a machining method plan predetermined for each of the basic contour features A tool interference check method comprising: a shape calculation step; and an interference determination step of determining the presence or absence of interference by comparing the outermost contour shape with the product shape designed in the design step.