JP2006350524A - Process necessity decision apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve automatic decision whether or not processing of a residual process portion is necessary without need of a long time period for the above decision, complete removal of the residual process portion requiring the processing, and avoidance of interference at the time of die matching. <P>SOLUTION: The apparatus includes a data input means 3 for inputting a use tool data 11 of an NC machine constituting a portion of a CAM system, NC data 12 for supplying the moving quantity of the tool with numerical information, model data 13 of a target die form, and an incorporated data 14 including at least molding quality and a plate thickness. The apparatus also includes a residual process portion inspection means 4 for detecting the residual process portion left for process on a basis of each combined die, a process necessity decision means 5 for deciding whether or not processing is necessary for the detected residual process portion, and a data indication means 7 for indicating the residual process portion decided to be necessary for processing in the process necessity decision means 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a machining necessity determination device that determines whether or not a machining remaining portion of a product machined by an NC machine tool that forms part of a CAM (computer-aided machining) system is to be machined.

  When machining dies used to manufacture automotive stamping parts, create a machining model of the mold based on the mold design, and based on the machining model and tool data of the tool used for machining the mold. NC (Numerical Control: numerical control) data, which is machining data for actually machining a die, is created by CAD.

  In the case of a mold that performs plate forming, the product shape cannot be transferred as it is due to the physical characteristics of the steel sheet, so the processing model of the mold is preliminarily related to the molding quality and thickness to prevent distortion and cracking. Data is woven in, and relief parts are woven into parts that are not related to molding.

In such a machining model, there are a portion where a gap is larger than the thickness of the pressed steel plate in the upper and lower molds, and a portion where the thickness is equal to or less than the plate thickness. Therefore, as described in Japanese Patent Application Laid-Open No. 200-148220 (Patent Document 1), in order to confirm the shape quality after machining on CAD, the machining remaining portion is calculated by calculating the distance between the NC data and the machining model. We are grasping.
JP 2000-148220 A

  However, in the processing remaining portion inspection apparatus disclosed in Patent Document 1, when elements of molding quality, sheet thickness, and casting shape relief portion are woven into the processing model, the remaining processing portion remaining in the mold needs to be truly processed. It was not possible to determine whether it was a part or a part that was not processed but actually required to be processed.

  NC data must be created again if it is a part that needs to be machined. However, the operator needs to make a decision by comparing the machining model shape with the weaving data on the molding quality. As a result, the correctness of the machined mold could not be guaranteed.

  In addition, since the determination of the remaining machining portion is made only for the machining model to be machined (for example, the lower mold model), if there is a remaining machining portion that must be removed, mold matching is performed. Interference may occur.

  The present invention has been made in order to solve the above-described problems of the prior art, and can automatically determine whether or not the remaining portion to be processed is necessary. It is an object of the present invention to provide a processing necessity determination device that can completely remove a remaining processing portion that needs to be processed and can avoid interference during mold matching.

  In order to achieve the above object, a machining necessity determination device according to the present invention includes tool data used by an NC machine tool that constitutes a part of a CAM system, NC data that gives the amount of tool movement as numerical information, and a target mold shape. The data input means for inputting the model data and the weaving data including at least the molding quality and the plate thickness, the processing remaining portion inspection means for detecting the remaining processing portion remaining for each die type, and the processing remaining portion inspection means Processing necessity determination means for determining whether or not the detected remaining processing portion is a portion that requires processing, and data display means for displaying the remaining processing portion determined to be processed by the processing necessity determination portion. It is characterized by comprising.

  According to the machining necessity determination device according to the present invention having the above-described configuration, it is possible to automatically determine whether machining is necessary for the remaining machining portion, and no time is required for the determination of machining necessity. The processing remaining portion that needs to be processed is completely removed, and interference during mold matching can be avoided.

  Below, the processing necessity judgment apparatus concerning the present invention is explained in detail based on a drawing. In this embodiment, for example, processing of a press die composed of a combination die of an upper die (male die) and a lower die (female die) will be described as an example.

  FIG. 1 is a block diagram of a machining necessity determination device according to the present embodiment. As shown in the figure, the machining necessity determination device 1 of the present embodiment includes an input interface 2, a data input means 3, a machining remaining portion inspection means 4, a machining necessity judgment means 5, an output interface 6, and a data display means 7. I have.

  The input interface 2 is an interface for transmitting data from the data input means 3 to the processing remaining portion inspection means 4.

  The data input means 3 inputs predetermined data such as NC data to a computer that controls the NC machine tool of the CAM system.

  The processing remaining part inspection means 4 detects the remaining processing part remaining after processing for each of the upper mold and the lower mold.

  The processing necessity determination means 5 is that the processing remaining portion detected by the processing remaining portion inspection means 4 is a portion that really needs processing, or is a processing remaining portion but substantially needs processing. It is determined whether or not the part is not.

  The output interface 6 is an interface for causing the data display means 7 to transmit data from the processing necessity determination means 5.

  The data display means 7 displays, via the output interface 6, the machining remaining portion determined to require machining by the machining necessity judgment means 5.

  Specifically, the processing remaining portion inspection unit 4 and the processing necessity determination unit 5 of the processing necessity determination device 1 according to the present embodiment specifically modify an operation program of a normal computer constituting a part of a normal CAM system. It is composed by doing.

  FIG. 2 is a block diagram showing a processing configuration when the computer of the CAM system functions as the machining necessity determination device of the present embodiment. In this embodiment, since a grinding tool is used as a tool used for the NC machine tool, in the following description, “remaining portion to be processed” is replaced with the term “remaining portion to be cut”.

  As shown in FIG. 2, information in the tool information database 11, NC data 12, mold shape model data 13, and mold information 14 are input from the data input unit 3.

  The tool information database 11 stores data relating to all tool shapes used for machining a die provided in an NC machine tool constituting a part of the CAM system. The NC data 12 is data indicating the movement locus of a tool used in the NC machine tool as numerical information. The mold shape model data 13 is three-dimensional shape data of the target mold shape. The mold information 14 is weaving data such as forming quality, the thickness of a pressed steel sheet, and a casting relief curved surface.

  The remaining machining part inspection means 4 detects uncut parts for each upper die and lower die by distance calculation using the tool shape data in the tool information database 11, NC data 12 and the die shape model data 13. (S101). Then, uncut data for the detected uncut portion is extracted for each of the upper and lower molds and transferred to the machining necessity determination means 5 (S102).

  In the machining necessity determination means 5, the upper die and lower die reference points are aligned based on the die shape model data 13, and the uncut material data is moved to the reference position of the die shape model data 13. The uncut data is subjected to matrix conversion (S103). Next, the nearest point distance between an arbitrary point (mold point) of the uncut portion remaining on the lower mold as a processing target and the mold (upper mold) on the opposite side is calculated (S104).

  That is, as shown in FIG. 3A, any mold point P1 (P1 to Pn) is found in the casting escape portion 34 detected as the uncut portion 33 remaining in the lower mold 31 by the processing remaining portion inspection means 4. Set. Next, as shown in FIG. 3B, the nearest point from the mold point P1 to the upper mold 32 is calculated. At this time, if an uncut portion on the upper die side remains at the closest point of the upper die 32, the uncut amount is also added. Then, as shown in FIG. 3C, the value (L-L1) obtained by subtracting the uncut amount L1 remaining in the lower mold 31 from the obtained closest point distance L is less than the allowable value (L-L1 <allowable value). In some cases, it is determined that the part requires processing. On the other hand, if it is equal to or greater than the allowable value (L−L1 ≧ allowable value), it is determined that the part does not require processing. In the present embodiment, since the upper mold 31 and the lower mold 32 are press dies, the allowable value is the thickness of a molded product (for example, a steel plate).

  Further, the machining necessity determination unit 5 creates uncut material data based on allowable value (plate thickness) determination (S105), extracts uncut material data, and transfers it to the data display unit 7 (S106).

  The data display means 7 is constituted by, for example, a liquid crystal display device, CRT or LED display device equipped in the CAM system, and displays uncut material data transferred from the processing necessity determination means 5 (S107). ).

  FIG. 4 is a flowchart showing a procedure for creating uncut data in the processing necessity determination unit in the processing configuration of FIG. 2, and corresponds to the processing in the A part (S103 to S105) of FIG.

  As described above, in order to match the reference points of the upper die 31 and the lower die 32, the mold shape model data 13 is moved to the reference position (S201), and the uncut material data for each of the upper and lower dies is moved to the reference position. (S202).

  Then, for example, data of allowable values such as the thickness of the molded product (steel plate) is read (S203), weaving data such as forming quality is read, and a determination method (allowable value) is determined by comparing the mold points with the weaving range. Determine (S204).

  If the uncut portion of the opposite mold (upper mold) has already been calculated (S205: YES), the process proceeds to the next candidate point (next mold point P2). On the other hand, if the uncut portion of the opposite mold (upper mold) has not yet been calculated (S205: NO), it is determined whether or not the uncut portion remains on the opposite mold (upper mold). (S206).

  If there is no uncut portion on the opposite mold (upper mold) (S206: NO), the closest point with the opposite mold (upper mold) corresponding to the XY coordinates (mold point P1) of the uncut material data The distance L is calculated (S207). On the other hand, when an uncut portion remains on the opposite die (upper die) (S206: YES), the opposite die (upper die) corresponding to the XY coordinates (die point P1) of the uncut material data is cut. The closest point distance L to the remaining part is calculated (S208).

  Next, as shown in FIG. 3 (c), a value (L-L1) obtained by subtracting the lower mold residual amount L1 from the closest point distance L obtained in step 207 or 208 is an allowable value (for example, a plate It is determined whether or not the thickness is further away (S209). That is, if the value (L-L1) obtained by subtracting the uncut remaining amount L1 of the lower mold from the nearest point distance L is equal to or greater than an allowable value (for example, plate thickness) (L-L1 ≧ allowable value), the next candidate Move to point (next mold point P2). On the other hand, if it is less than the permissible value (for example, plate thickness) (L-L1 <allowable value), it is registered as a top and bottom uncut point (S210).

  The above-described processing from step 204 to step 209 is loop-processed with respect to the number of remaining uncut points for each of the upper and lower dies, and loop processing is performed for the number of upper and lower dies.

  As described above, according to the processing necessity determination apparatus 1 of the present embodiment, first, the unprocessed part inspection means 4 is model data 13 and NC data of a press mold including an upper die 32 and a lower die 31. 12 and an uncut portion are detected by distance calculation based on comparison between the tool information database 11 and the tool shape data. Next, the processing necessity determination means 5 determines a determination method (allowable value) by comparing an arbitrary die point of the uncut part and the weaving range of the molding quality, and the uncut part by comparing with the allowable value. It is determined whether the part is an uncut part that really needs to be processed or a part that is an uncut part but that does not need to be processed. If the machining quality is not necessary due to the weaving of the molding quality, the machining is not required even if the remaining amount is greater than the allowable value (plate thickness or the like). For example, as shown in FIG. 5, if there is a casting escape portion 34, it is determined that this portion is an uncut portion, but even if such an uncut portion is present, regardless of the molding, If it is cut more than the thickness, there is no effect on the molding quality of the press work. However, if it is a part necessary for formability, it is treated as an uncut part even if it is an allowable value (finish cusp amount, etc.) or more.

  That is, according to the processing necessity determination device 1 according to the present embodiment, it is possible to automatically determine the necessity of processing of the uncut portion, and it is possible to perform the processing without requiring time for determining the necessity of processing. Necessary uncut portions are completely removed, and interference during mold matching between the upper mold and the lower mold can be avoided.

  In addition, it is possible to save labor in determining the necessity of processing the inspection process and uncut parts, and since the main work is transferred from the worker to the CAM system, there is no reduction in work efficiency or human error, resulting in a dramatic increase in product yield. Can be improved.

  The machining necessity determination device according to the present invention can be widely used in machine tools that automatically control a machine with NC (Numerical Control) in a CAM (Computer Aided Machining) system. For example, an NC drilling machine and an NC lathe It can be applied to NC milling machines, NC grinders, machining centers and turning centers.

It is a block diagram of the processing necessity determination apparatus which concerns on this Embodiment. It is a block diagram which shows a process structure in case the computer of a CAM system functions as a process necessity determination apparatus of this Embodiment. It is explanatory drawing which shows the relationship between the determination condition of nearest point distance, the amount of uncut parts, and allowable value. It is a flowchart which shows the preparation procedure of the uncut material in the process necessity determination means in the processing structure of FIG. It is explanatory drawing of the uncut part which does not need a process.

Explanation of symbols

1 processing necessity judgment device,
2 input interface,
3 Data input means,
4 Processing remaining part inspection means,
5 processing necessity determination means,
6 output interface,
7 Data display means,
11 Tool data,
12 NC data,
13 Target mold shape model data,
14 Weaving data,
31 Lower mold,
32 Upper mold,
33 Uncut parts,
34 Casting relief part,
P1 type point,
L nearest point distance,
L1 Uncut amount.

Claims (3)

Data related to the tool shape used in the NC machine tools that form part of the CAM system, NC data that gives the numerical value of the tool movement trajectory, mold shape model data that indicates the target mold shape, and at least the molding quality, Data input means for inputting weaving data including the plate thickness;
Based on the data input by the data input means, a processing remaining portion inspection means for detecting a processing remaining portion remaining for each mold type; and
A processing necessity determination unit that determines whether the processing remaining part detected by the processing remaining part inspection unit is a part that requires processing;
Data display means for displaying a remaining machining portion determined to require processing by the processing necessity determination means;
A processing necessity determination device characterized by comprising:   2. The machining necessity determination apparatus according to claim 1, wherein the machining remaining portion inspection unit detects a machining remaining portion by distance calculation using the tool shape data, NC data, and mold shape model data.   The processing necessity determination means aligns the reference point position of the matching mold, performs matrix conversion to move the remaining processing data to the reference position based on the model data, and selects an arbitrary point of the remaining processing portion remaining in one mold The nearest point distance (L) between the mold and the other mold is obtained, and the value (L-L1) obtained by subtracting the remaining machining amount (L1) of one mold from the nearest point distance L is less than the allowable value (L-L1 <allowable) 3. The processing necessity determination device according to claim 1, wherein it is determined that the processing is required when the value is a value).

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