JP2675634B2 - Digitized data processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) In the present invention, a model shape is scanned with a stylus (stylus) on the surface a plurality of times at predetermined intervals, and the coordinate value of the stylus is sampled for each scanning. The present invention relates to a digitizing data processing device that edits and converts digitizing data composed of scan data that is a series of minute straight lines with endpoints as end points to create an NC (numerical control) machining program.

(Prior Art) Conventionally, when creating a mold including a free-form surface shape, a model having the same shape as the mold has been created in advance, and copying has been performed by a copying machine using this model. However, in order to create male and female dies, an inverted model made of gypsum, whose accuracy is difficult to maintain, is required, and there is a drawback that the copying speed of the copying machine cannot be sufficiently obtained.

Therefore, an attempt was made to apply high-speed and high-reproducibility NC machining recognized by the spread of NC machine tools to die making, and a digitizer device for that purpose was developed. This digitizer device is composed of scan data that is a series of minute straight lines that scan the model shape with a stylus on the surface a plurality of times at predetermined intervals and sample the stylus coordinate values for each scanning. It obtains digitized data, edits and converts this digitized data to create an NC machining program. However, in this NC machining program, only machining with a tool having the same shape as that of the stylus is possible, and the conventional profiling is simply separated into two processes through the NC machining program.

Therefore, conversion processing of digitized data to enable machining with a tool having a shape different from that of the stylus, extraction processing of the processed part in the digitized data, and digitization measured from the model without using the digitized data of the inverted model A digitized data processing device has been developed that can perform processing such as creating an inverted shape NC machining program using data. According to such a digitizing data processing device, it is possible to match the shape of the stylus with the shape of the desired tool, specify the scanning range, and create the digitizing data equivalent to operating the digitizer device by calculation processing. it can.

FIG. 6 is a block diagram showing an example of the above-mentioned digitizing data processing device. Digitizing data (hereinafter referred to as measurement digitizing data) DD from the digitizing device is stored in the digitizing data storage means 2 via the digitizing data input means 1. To be done. The measured digitizing data DD is read from the digitizing data storage means 2 to the digitizing data offset means 3, and is offset according to the stylus shape data DS input via the tool shape input means 4 to represent the surface shape of the model. Hereinafter, it will be referred to as offset digitizing data) DD, and this offset digitizing data DO is further offset according to the tool shape data DT input via the tool shape inputting means 4 to represent the movement path of the tool (hereinafter, This is referred to as processing digitized data) DP, and offset digitized data DO and processed digitized data DP are stored in the digitized data storage means 2.
Processing digitized data DP is digitized data storage means 2
Digitized data which is read from the digitized data extraction means 5 to the digitized data extraction means 5 and which represents the designated processing range from the processed digitized data DP in accordance with the designated processing range SA input through the range designation input means 6 (hereinafter referred to as extracted digitized data).
The DS is extracted and stored in the digitized data storage means 2. Then, the processed digitized data DP and the extracted digitized data DS are read from the digitized data storage means 2 to the digitized data NC program conversion means 7 and converted, and an NC processing program is created and output.

In such a configuration, for example, the picking direction as shown in FIG. 7 is horizontal, and the measured digitized data DD obtained by scanning a model having a shape having a concave portion in the scanning direction with a spherical stylus is processed. The case will be described. It should be noted that all the scan data of the measured digitized data DD in this case are the same, and therefore one scan data will be described.

The digitizing data offset means 3 reads out the measured digitizing data DD from the digitizing data storing means 2 as shown by the solid line in the eighth figure, and offsets it according to the shape data DS of the stylus input through the tool shape inputting means 4 and the broken line in the figure. The offset digitized data DO is as shown in. In addition, this offset digitizing data
DO is offset according to each shape data DT of the roughing tool, the medium finishing tool and the finishing tool input via the tool shape input means 4, and is indicated by the solid line in FIG. Each digitizing data DP for roughing, medium finishing and finishing.

Here, FIG. 10 shows the uncut portion that remains on the work when the above-mentioned processing digitizing data is converted into an NC processing program and processed. As is clear from the figure, the uncut portion is generated in the concave portion, and the larger the tool diameter, the larger the number.
Therefore, if the machining range in the current process (medium finishing and finishing) is designated only in the uncut portion of the previous process (roughing and medium finishing), the machining efficiency can be improved.

The digitizing data extracting means 5 reads, for example, the processing digitizing data DP for medium finishing processing from the digitizing data storing means 2 and inputs it via the range designation input means 6.
11 Extracted digitizing data DS for medium finishing machining indicated by the dashed-dotted line in the figure is extracted in accordance with the machining designated range SA indicated by the arrow in the figure. Therefore, the machining digitizing data DP for the medium finish machining shown by the dotted line in the figure becomes unnecessary. Similarly, the extracted digitizing data DS for finishing is also extracted from the processing digitizing data DP for finishing.

And digitized data NC program conversion means 7
Reads the converted digitizing data DP for rough machining, the extracted digitizing data DS for medium finishing and the extracted digitizing data DS for finishing, and converts it from the digitizing data storage means 2 for rough machining, medium finishing and Each for finishing
Create and output NC machining program.

(Problems to be Solved by the Invention) As described above, a portion where uncut remains occurs always has a concave shape, but it is difficult to accurately specify the processing range. For this reason, the operator specifies the machining range with some allowance, but if the margin is too large, the tool will operate unnecessarily and the machining time will increase, and if the margin is too small, unmachined parts may occur. It was

The present invention has been made from the above-mentioned circumstances, and an object of the present invention is to digitize a NC machining program with high machining efficiency by accurately and automatically identifying the uncut portion in the previous process. It is to provide a data processing device.

(Means for Solving the Problem) The present invention is to scan a model shape with a stylus on a surface a plurality of times at predetermined intervals, and for each scanning, a fine straight line whose end point is a point where the coordinate value of the stylus is sampled. Offset digitizing data consisting of a series of scan data as digitizing data expressing the surface shape of the model, offsetting the digitizing data expressing the surface shape of this model, and moving the tool to process the die material The present invention relates to a digitizing data processing device that creates a NC machining program by converting the digitizing data that represents the trajectory of the tool and the digitizing data that represents the trajectory, and the above object of the present invention is to convert the surface shape of the model into Digitize data to represent, digitize to represent the movement trajectory of the tool Data and the uncut portion specifying means for specifying the uncut portion according to the shape data of the tool, and the uncut portion is expressed from the digitized data expressing the surface shape of the model according to the information of the specified uncut portion. This is achieved by including an uncut portion extracting means for extracting digitized data.

(Operation) The digitizing data processing device of the present invention creates an envelope shape on the assumption of tool movement, extracts a portion not included in the envelope shape from the offset digitizing data DO, and leaves the extracted portion uncut. Since the process to specify the part is automatically performed, by creating the processed digitized data DP from the digitized data that represents the uncut portion extracted from the offset digitized data DO, the NC that indicates the accurate processing range can be displayed. A machining program can be easily created.

(Embodiment) FIG. 1 is a block diagram showing an example of the digitized data processing device of the present invention in correspondence with FIG. 6, and the same components will be assigned the same reference numerals and explanations thereof will be omitted. The machining digitizing data DP and the offset digitizing data DO for rough machining are specified from the digitized data storage means 2 and the uncut portion specifying means 8 is used.
The uncut portion is specified according to the shape data DT of the roughing tool input via the tool shape input means 4, and is sent to the uncut portion extracting means 9 as information SS of the uncut portion. Then, the offset digitized data DO is extracted from the digitized data storage means 2 and the uncut portion extracting means 9 is used.
The digitized data (hereinafter referred to as the uncut portion extraction digitized data) DSS that is read out, and is represented by the uncut portion specified means 8 according to the uncut portion information SS is extracted and the digitized data storage is performed. It is adapted to be stored in the means 2.

In such a configuration, an example of the operation will be described with reference to the flowchart of FIG. 2. The uncut portion identifying means 8 initializes the scan data number NT of the machining digitizing data DP for rough machining and adds "1". At the same time, the number NTS of the minute moving blocks forming the scan data is initialized and "1" is added (steps S1 to S4). Then, of the NTth scan data of the processing digitizing data DP for rough processing
An envelope shape as shown in FIG. 3 when the roughing tool is moved along the NTSth minute moving block is created and stored (step S5). After the envelope shape is created for all the minute moving blocks of the NTth scan data (steps S4 to S6), the same process is performed for the next scan data (steps S2 to S7), and all the minute moving blocks of all the scan data are processed. Create an envelope shape. next,
Offset digitize data DO scan data number
NM is initialized and "1" is added, and at the same time, the number NMS of the minute moving blocks forming this scan data is initialized and "1" is added (steps S8 to S11). Then, the NMS of the NMth scan data of the offset digitizing data DO
A portion that is not included in the envelope shape as indicated by the dashed-dotted line in the fourth illustration is extracted and stored for the second minute moving block (step S12). When the extraction of the portion not included in the envelope shape is completed for all the minute moving blocks of the NMth scan data (steps S11 to S13), the same process is performed for the next scan data (steps S9 to S14),
A portion not included in the envelope shape is extracted for all minute moving blocks of all scan data. Then, the portion not included in the extracted envelope shape is sorted for each scan data, and the uncut portion information SS including the uncut portion start point and the uncut portion end point as shown in FIG. 5 is specified (step S1
Five). The uncut portion extracting means 9 extracts uncut portion extracted digitized data DSS between the uncut starting point and the uncut end point from the offset digitizing data DO (step S16), and ends all the processes.

A boundary line that goes around the uncut part is created using the uncut part start point and uncut part end point, which is the information SS of the uncut part, and this boundary line is used to extract the uncut part from the offset digitizing data DO and digitize it. The data may be extracted.

(Effects of the Invention) As described above, according to the digitizing data processing device of the present invention, the machining range of the uncut portion can be specified accurately and automatically, so that the NC machining program for the uncut portion can be easily performed. It can be created, and high-precision processing can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of the digitized data processing device of the present invention, FIG. 2 is a flow chart for explaining the operation example thereof, and FIGS. 3 to 5 are examples of processing by the digitized data processing device of the present invention. FIG. 6 is a block diagram showing an example of a conventional digitized data processing apparatus, and FIGS. 7 to 11 are diagrams for explaining processing examples by the conventional digitized data processing apparatus. 1 ... Digitize data input means, 2 ... Digitize data storage means, 3 ... Digitize data offset means, 4 ... Tool shape input means, 5 ... Digitize data extraction means, 6 ... Range designation input means, 7 ... … Digitized data NC program conversion means, 8 …… Uncut part identification means, 9 …… Uncut part extraction means.

Claims (2)

(57) [Claims] 1. A scan data composed of a series of minute straight lines whose end points are points at which the coordinate values of the stylus are sampled for each scanning, by scanning the surface of the model with a stylus a plurality of times at predetermined intervals. As digitizing data that represents the surface shape of the model by offsetting the digitizing data that is represented by the digitizing data that represents the movement trajectory of the tool that processes the die material by offsetting the digitizing data that represents the surface shape of this model, In the digitizing data processing device for converting the digitizing data expressing the movement trajectory of the tool to create a numerical control machining program, the digitizing data expressing the surface shape of the model, the digitizing data expressing the movement trajectory of the tool and the digitizing data Remove the uncut part according to the tool shape data And an uncut portion extracting means for extracting the digitized data representing the uncut portion from the digitized data expressing the surface shape of the model according to the information of the specified uncut portion. Digitized data processing device characterized by 2. The uncut portion specifying means creates an envelope shape when the tool is moved based on the digitizing data expressing the movement trajectory of the tool and the shape data of the tool, and the surface of the model. The digitized data processing device according to claim 1, wherein a portion not included in the envelope shape is extracted from digitized data representing a shape to specify a start point and an end point of the uncut portion.