JP2003208206A - Three-dimensional cam device, tool cutter line preparing method and tool cutter line preparing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly manufacture a lost form pattern by preventing the interference with a processing work at the time of manufacturing the lost form pattern by a simple method. <P>SOLUTION: In a design shape data acquiring process S1, three-dimensional design shape data are acquired, and the CL data of a tool are automatically prepared by a CL preparing process S3 based on the three-dimensional data. In a tool relation data acquiring process S5, data associated with the dimensions of the tool are acquired, and in a processing work dimension acquiring process S7, the data of the processing work dimensions are acquired. In an interference check process S9, the CL data are compared with the tool data and the processing work dimension data, and the presence/absence of the interference of the tool or the like with a workpiece is checked, and when any interference is present, whether or not the interference occurs at any unnecessary shape part is judged in an unnecessary shape judging process S11, and when it is judged that the interference occurs in the unnecessary shape part, new CL for preventing the interference is automatically prepared by an interference preventing CL preparing process S13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional CAM device, a tool cutter line creating method, and a tool cutter line creating program.

[0002]

2. Description of the Related Art For example, a large-sized steel plate forming member used for an automobile is manufactured by a press die, and when the press die is to be produced by casting, a wooden die is used as a prototype for producing the die. Unlike the mold, it is not necessary to remove it from the mold, and a disappeared model made of styrene foam, which is excellent as a prototype with a high degree of freedom in shape, is adopted. To make this disappearance model, 3D CAD / CAM (Computer A
ided Design, Computer Aide
d Manufacturing) technology is used.
That is, the three-dimensional CAD device creates three-dimensional data of the design shape of the vanishing model, and based on the three-dimensional data of the design shape, the three-dimensional CAM device creates a CL (C
(Also called utter Line, machining path, tool path) data is created, and based on the created CL data,
A lost model is machined and manufactured from a machined work by an NC machine tool.

Then, when the CL data thus created is used for actual machining, the problem that the tool holder, the spindle head of the NC machine tool or the attachment collides with the workpiece or jig (hereinafter referred to as interference) (Referred to) may occur. When the interference occurs, the work piece becomes a defective product, which causes a problem such as damage to the tool. Therefore, in order to avoid interference in advance, in a three-dimensional CAM device, if an interference check is performed and it is detected that interference has occurred, the tool is changed to a tool having a long dimension that does not cause interference, or a part thereof. In order to change the procedure to perform additional machining offline later without performing machining, interference avoidance measures such as separately creating CL for offline machining are taken.

[0004]

[Problems to be Solved by the Invention] However, three-dimensional CAM
Even when the apparatus detects the interference between the tool or the like and the work piece, the interference partner may be the work piece and the unnecessary shape portion which is not the designed shape portion of the disappearing model. That is, when the tool moves along CL,
Even when the tool holder or the like collides with an unnecessary surface of the workpiece, the three-dimensional CAM device notifies the detection of interference. Then, in the related art, when the interference is visually checked and it is confirmed that the interference location is an unnecessary shape portion, the same troublesome work as the interference avoidance measure for the design shape is performed. Therefore, it took a lot of man-hours to manufacture the disappearance model.

An object of the present invention is to solve the problems of the prior art, to prevent the interference with the work piece in the production of the disappearance model by a simple method, and to make the disappearance model in a short time. An original CAM device, a tool cutter line creation method, and a tool cutter line creation program are provided.

[0006]

In order to achieve the above object, a three-dimensional CAM device according to the present invention is used in the case where a vanishing model for producing a mold is machined from a machined work by an NC machine tool. In a three-dimensional CAM device provided with a means for creating a cutter line of a tool, a machining workpiece dimension obtaining means for obtaining the dimension of the machining workpiece, an interference checking means for checking the interference between the tool and the workpiece, A workpiece that interferes with a tool is an unnecessary shape determining unit that determines that the workpiece is the workpiece and an unnecessary shape portion that is not the design shape portion of the disappearing model,
An interference avoiding cutter line creating means for newly creating a cutter line of a tool is provided in an unnecessary shape portion which interferes.

Further, the method for producing a tool cutter line according to the present invention is a tool cutter line for producing a tool cutter line when an disappearance model for producing a mold is machined from a machined work by an NC machine tool and produced. A method of creating, wherein a machining workpiece dimension obtaining step of obtaining dimensions of the machining workpiece, an interference check step of checking interference between a tool and a workpiece, and a workpiece interfering with the tool is the machining workpiece. And an unnecessary shape determination step of determining that it is an unnecessary shape portion that is not the design shape portion of the vanishing model, and an interference avoidance cutter line creation step of newly creating a cutter line of the tool in the unnecessary shape portion that interferes , Are provided.

Further, the tool cutter line creating program according to the present invention is a tool cutter line for creating a tool cutter line in the case where a lost model for making a mold is machined from a machined work by an NC machine tool and manufactured. It is a creation program,
Machining workpiece dimension acquisition processing procedure for acquiring the dimensions of the machining workpiece, an interference check processing procedure for checking interference between a tool and a workpiece, and a workpiece that interferes with the tool,
Unnecessary shape judgment processing procedure for judging that the workpiece is the undesired shape portion that is not the designed shape portion of the disappearing model, and an interference avoiding cutter that newly creates a cutter line for the undesired shape portion that interferes And a line creation processing procedure.

The three-dimensional CAM device according to the present invention acquires data of the dimensions of the work to be processed, and performs an interference check for checking the interference between the tool and the workpiece. Then, if it is determined that the work piece that interferes with the tool is a work piece and is an unnecessary shape portion that is not the design shape portion of the disappearing model, a new cutter line of the tool is added to the unnecessary shape portion that interferes. create. Therefore, there is no need to change to a tool that does not cause interference, or troublesome work such as separately creating a CL for offline machining in that part, and to prevent interference with the machined work and eliminate the disappearance model. Can be manufactured in a short time.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1A is a cross-sectional view of a large vanishing model 1 for producing a mold. For example, when a press die for a large product such as an automobile part is manufactured by casting, as shown in this figure, the disappearance model 1 having the same shape as that of the large object is not made integrally but divided into sliced shapes. It is divided into 3, 5, 7 and manufactured, and later assembled and integrated.
FIG. 1B is a perspective view of the slice shape 3. In this perspective view, the cross-sectional view on the plane A is shown as the cross-sectional view of the slice shape 3 in FIG.

Generally, when a disappearance model is manufactured by an NC machine tool, CL is created in a three-dimensional CAM device based on three-dimensional data of a design shape of a product manufactured by a three-dimensional CAD device. In CL, as seen in slice shape 3 in FIG.
May not be continuous. That is, in addition to the solid design shape portions 9 and 11 corresponding to CL, there is, so to speak, an unnecessary shape portion 13 as a space area. In this case, a rectangular parallelepiped work piece such as expanded styrene is prepared, and the above-mentioned C
When machining is performed by the NC machine tool in accordance with L, as shown in FIG. 2, the holder portion of the tool 15 that moves along CL of the solid design shape portion collides with the unnecessary surface of the machining workpiece 17 and causes interference. .

Interference between such a work and a tool is
This occurs because CL is created for a solid design shape, while the work piece has a larger solid rectangular shape or the like. Therefore, not only in the case of the slice shape 3 in which CL shown in FIG. 1 is not continuous,
For example, when trying to obtain a disappearing model from a work piece larger than the solid design shape, similar interference may occur between the work piece outside the solid design shape and the tool or the like. The present invention seeks to solve the problem of interference in such cases.

FIG. 3 shows a CAM according to an embodiment of the present invention.
The block diagram of the device 21 and the CAM device 21 are connected to the external CAD device 25, CAD / CA via the network 23.
It is a figure which shows a mode that it is connected with the M file server 27 and NC machine tool 29. The CAM device 21 has a CPU 31
And a communication control unit 33, an input unit 35, an output unit 37, and a storage device 39, which are mutually connected by an internal bus.
The communication control unit 33 is connected to the CAD device 25 that creates three-dimensional design shape data of the product via the network 23. In addition, the communication control unit 33, via the network 23, CA such as three-dimensional data created by the CAD device 25 and CL data created by the CAM device based on the CA.
It is connected to a CAD / CAM file server 27 that stores D / CAM data files. Furthermore, the communication control unit 33
Is connected to an NC machine tool 29 that processes a material to be processed and produces a lost model based on CL data via a network. The CAD device may be included in the CAM device 21, or the CAD / CAM data file may be stored in the storage device 39. The NC machine tool 29 is not limited to one, and a plurality of NC machine tools having different performances may be connected.

The CPU 31 includes a design shape data acquisition unit 41 that reads out design shape data of a product from the CAD / CAM file server 27 via the communication control unit 33, and a CL creation unit 43 that automatically creates a CL based on the design shape data. . Furthermore, the tools, jigs, and the like possessed by the NC machine tool 29,
A tool-related data acquisition unit 45 that acquires tool-related data such as the spindle head of the NC machine tool and the dimensions of the attachment from the NC machine tool 29 via the communication control unit 33 is provided.
The tool-related data may be stored in the storage device 39 and read and acquired from there. Further, it is provided with a machined work size acquisition unit 47 for inputting data of the size of the machined work for producing the disappearance model from an input unit such as a keyboard and acquiring the data. The data of the dimension of the processed work may be stored in the storage device 39, and read and acquired from the storage device 39.

The CPU 31 is provided with an interference check section 49 for comparing the CL data with the tool data and the work size data to check the interference between the tool and the workpiece. Also, when interference is confirmed, it is determined whether or not the target of interference is a work piece, and when it is a work piece, an unnecessary shape that determines whether the interference occurs in the design shape part or the interference occurs in the unnecessary shape part. The determination unit 51 is provided. Then, when the object of interference is an unnecessary shape portion, the interference avoidance CL creation unit 53 newly creates a cutter line of the tool in the interference unnecessary shape portion.

The operation of this structure is shown in FIG.
An example of how to solve the interference between the holder of the tool 15 and the workpiece 17 that occurs with respect to the slice shape of the disappearance model will be described with reference to the flowchart of FIG.

S1 is a design shape data acquisition step, and CP
The design shape data acquisition unit 41 of U31 is used by the communication control unit 3
3. Through the network 23, the CAD / CAM file server 27 reads and acquires the three-dimensional design shape data of the product for which the disappearance model is to be created. The design shape data is a three-dimensional model of the design drawing, which can be easily operated in the CAM device by a data exchange format.
Standardized data called IGES or STEP can be used.

S3 is a CL creating step, which is a CL creating unit 43.
Is a step of automatically creating CL data based on the three-dimensional data acquired in the design shape data acquisition step of S1.

S5 is a tool-related data acquisition step, in which the tool-related data acquisition unit 45 uses the communication control unit 33 and the network 23 to obtain a holder for a tool held by the NC machine tool from the database provided in the NC machine tool 29. Read the data about the tool such as the size of the part, the size of the jig to attach the work piece, the size of the spindle head of NC machine tool,
This is the process of acquiring.

In step S7, a size of the work to be processed is a process of inputting data of the size and shape of the work from the input unit 35 such as a keyboard, and the work size acquiring unit 47 acquiring the data. When using a standardly prepared machined work, the storage device 39 stores the data of the shapes and dimensions of the plurality of standard machined works, and the machined work size acquisition unit 47 reads and acquires the data. You can The processed work may be an unprocessed solid processed work, for example, a rectangular parallelepiped processed work, or a processed work that has already been partially processed. At that time, data of the processed shape is acquired.

Step S9 is an interference check step, in which the interference check section 49 compares the CL data with the tool data and the workpiece size data, and checks whether or not there is interference between the tool and the workpiece. Is. Since the check of the interference is performed in relation to the CL data, the other party with which the tool or the like interferes may be the design shape portion or the so-called unnecessary shape portion which is the work and is not the design shape portion.

FIG. 5A shows the interference between the holder portion of the tool 15 and the unnecessary surface of the work 17 in FIG.
It is an enlarged view of the relevant parts. In this case, when the predetermined tool 15 is moved along the designed shape part 11 corresponding to the solid part of the product for the purpose of interference check, the lower surface of the holder part of the tool 15 has an unmachined work 17
And collide with an unnecessary surface of the and cause interference. This interference is detected by the interference check unit 49.

In step S11, the unnecessary shape determination unit 51 determines whether or not the other party of the interference is a work piece, and when the work piece is a work piece, whether the interference occurs in the design shape portion or the interference occurs in the unnecessary shape portion. This is an unnecessary shape determination step of determining. Since the design shape part can be obtained as three-dimensional data, prepare the design shape data in advance, and if interference is detected, compare the location where the interference has occurred with the design shape data, and When the place where it occurs is a place not included in the design shape data, it can be automatically determined that interference occurs in the unnecessary shape portion.

In FIG. 5A, since the location of the interference is the unnecessary surface of the workpiece 17 and not the design shape portion 11, it is judged that the interference is occurring in the unnecessary shape portion. If it is determined that the interference has occurred in the unnecessary shape portion, proceed to the next step. When it is determined that the interference occurs in the design shape portion, the flowchart in FIG. 4 ends,
Consideration is being given to the use of prior art interference avoidance measures, for example, the method of changing to a tool having a long dimension.

In step S13, in the interference avoiding CL creating step, when the interference occurs in the unnecessary shape portion, the interference avoiding CL creating unit 53 creates a new CL for avoiding the interference on the unnecessary shape portion of the workpiece. It is a process of automatically creating.

FIG. 5B is a diagram showing how a new interference avoidance CL 61 is created on the unnecessary surface of the workpiece 17 in which interference has occurred, using the same tool 15 that has been used so far. In creating this new CL, it is premised that the same tool 15 that has been used up to now is used. This makes it possible to create a new CL for avoiding interference without increasing the number of types of tools and without increasing the working time for tool replacement.

FIG. 5 (c) is a diagram showing the relationship between the tool 15, the design shape portion 11, and the work 17 after the interference avoidance CL 61 is created. In this way, no part of the tool 15 interferes with the work piece 17.

In FIG. 4, all the steps are completed in the interference avoidance CL creation step of S13, but a new CL
After the creation, the interference check process can be performed again just in case.

[0029]

The three-dimensional CAM device, the tool cutter line creation method and the tool cutter line creation program according to the present invention prevent interference with the work piece in the production of the disappearance model by a simple method, and produce the disappearance model. Can be done in a short time.

[Brief description of drawings]

FIG. 1 (a) is a cross-sectional view of a large-scale vanishing model for producing a mold, illustrating that the sliced model is divided into three slices, and then assembled and integrated.
FIG. 1B is a perspective view of one slice shape.

FIG. 2 is a diagram for explaining an interference problem between a tool and a work piece according to the embodiment of the present invention.

FIG. 3 is a block diagram of a CAM device according to an embodiment of the present invention and a diagram showing a state in which the CAM device is connected to an external CAD device, a CAD / CAM file server, and an NC machine tool via a network. Is.

FIG. 4 is a flowchart of a CL creating method according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view for explaining how interference avoidance CL is created according to the embodiment of the present invention, and FIG. 5A shows a relationship regarding interference between a holder portion of a tool and an unnecessary surface of a workpiece. FIG. 5B is an enlarged view of a portion, and FIG.
FIG. 5C is a diagram for creating the
It is a figure which shows the relationship between a tool, a design shape part, and a process work.

[Explanation of symbols]

1 disappearance model, 3,5,7 slice shape, 9,11
Design shape part, 13 Unnecessary shape part, 15 Tool, 17
Processing work, 21 CAM device, 23 network,
25 CAD device, 27 CAD / CAM file server, 29 NC machine tool, 31 CPU, 33 communication control unit, 35 input unit, 37 output unit, 39 storage device,
41 design shape data acquisition unit, 43 CL creation unit, 45
Tool-related data acquisition unit, 47 Machining work size acquisition unit, 49 Interference check unit, 51 Unnecessary shape determination unit, 53
Interference avoidance CL creation unit, 61 Interference avoidance CL.

Claims (3)

[Claims] 1. A three-dimensional CAM device having means for creating a cutter line of a tool when a vanishing model for producing a mold is machined from a machined work by an NC machine tool and manufactured. Machining work piece size obtaining means for obtaining dimensions, interference checking means for checking interference between the tool and the work piece, and the work piece that interferes with the tool is the work piece and the design shape of the disappearing model A three-dimensional structure comprising: an unnecessary shape determination means for determining an unnecessary shape portion that is not a part; and an interference avoiding cutter line creation means for newly creating a tool cutter line in an unnecessary shape portion that interferes. CAM device. 2. A tool cutter line creating method for creating a cutter line of a tool when an disappearance model for producing a mold is machined from an object to be machined by an NC machine tool, the dimension of the object being machined. The process of obtaining the dimension of the workpiece, the step of checking the interference between the tool and the workpiece, the workpiece that interferes with the tool is the workpiece, and the design shape part of the disappearing model. A tool cutter line characterized by including an unnecessary shape determination step of determining that it is an unnecessary shape portion that is not a non-necessary shape, and an interference avoidance cutter line creation step of newly creating a tool cutter line in an unnecessary shape portion that interferes. How to make. 3. A tool cutter line creation program for creating a tool cutter line when a lost model for making a mold is machined from a machined work by an NC machine tool to be manufactured, and is a three-dimensional CAM device. , A machining workpiece dimension acquisition processing procedure for acquiring the dimensions of the machining workpiece, an interference check processing procedure for checking interference between the tool and the workpiece, and the workpiece interfering with the tool is the machining workpiece. And an unnecessary shape determination processing procedure for determining that it is an unnecessary shape portion that is not the design shape portion of the disappearing model, and an interference avoidance cutter line creation processing procedure for newly creating a cutter line of a tool in an unnecessary shape portion that interferes, A tool cutter line creation program characterized by executing.