JP2622303B2 - Digitized data processing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a digitized data processing device that converts digitized data obtained by scanning into a master model shape and creates an NC (numerical control) machining program.

(Prior Art) Conventionally, when creating a mold including a free-form surface shape, a master model having the same shape as the mold has been created in advance, and copying has been performed by a copying machine using the master 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 apparatus scans a master model shape with a stylus as a tracing stylus, obtains digitized data as coordinate values of the stylus, and converts the digitized data to create an NC machining program.
However, with this NC machining program, it is only possible to machine with a tool having the same shape as the shape of the sliver, and the conventional copying was simply separated into two processes via the NC machining program.

Therefore, conversion processing of digitized data to enable machining with a tool having a shape different from the shape of the stylus, and a concave portion of a ridge line (hereinafter referred to as a concave ridge line) when a two-dimensional surface forms a concave shape from the digitized data. A digitized data processing device has been developed that can perform processing data creation along the ridgeline, as well as processing to create an inverted shape NC machining program using digitized data measured from the master model without using digitized data of the inverted model. Was. According to such a digitizing data processing device, it is possible to make the shape of the stylus match the shape of the desired tool, specify the scanning range, and create digitizing data equivalent to operating the digitizer device by calculation processing. it can.

FIG. 3 is a block diagram showing an example of the above-mentioned digitizing data processing apparatus. Digitizing data (hereinafter referred to as measurement digitizing data) DD representing the master model shape from the digitizing apparatus is digitized through the digitizing data input means 1. It is stored in the data storage means 2.
Measured digitized data DD is digitized data storage means 2
And digitized data (hereinafter referred to as offset digitized data) DO representing the surface shape of the master model by being offset in accordance with the stylus shape data DS inputted through the tool shape input means 4 and digitized data offset means 3. Further, the offset digitized data DO is offset in accordance with the tool shape data DT input through the tool shape input means 4 to represent digitized data (hereinafter, referred to as the digitized data) representing the moving path of the tool.
The offset digitized data DO and the processed digitized data DP are stored in the digitized data storage means 2. The processing digitizing data DP is read out from the digitizing data storage means 2 to the intersection line processing data creating means 5, the concave ridge shape on the master model is recognized, and the concave ridge processing digitizing data (hereinafter, referred to as processing) along the concave ridge. DI (referred to as intersection line processing data) is created and stored in the digitized data storage means 2. Then, the processing digitizing data DP and the intersection line processing data DI are read from the digitizing data storage means 2 to the digitizing data NC program converting means 6 and converted.
An NC machining program is created and output.

(Problems to be Solved by the Invention) The above-mentioned digitized data processing apparatus requires measurement digitized data in which the master model shape is expressed with sufficiently high precision as its input data. When measuring a master model shape as shown in the figure, scanning is performed in a direction perpendicular to the concave ridge line between the shape surfaces 1 and 2 constituting the master model shape, and the above-described input data is picked up along the concave ridge line. It has gained. When creating digitized data (hereinafter referred to as “curved surface processing data”) for converting such measured digitized data to process a workpiece with a digitizing data processing device, the curved surface of finish machining to cut out the shape surfaces 1 and 2 The processing data can be scanned in the direction perpendicular to the ridge line between the shape surfaces 1 and 2 as with the input digitized measurement digitized data, and reciprocating processing can be performed while pick-feeding along the concave ridge line. The effect has been put.

On the other hand, the digitizing data of rough machining, which processes the raw material from the cast and forged materials to a state in which the above-mentioned finishing process is possible, shows that the tool load fluctuation during processing is smaller than that of cutting out the shaped surfaces 1 and 2. Although high efficiency is desirable, since the surface between the shape surfaces 1 and 2 is concave, there is a large amount of excess thickness near the concave ridge line at this time, and the tool load fluctuation becomes large (the shaded portion in the fifth illustration). Therefore, the machining digitizing data (hereinafter referred to as “intersection machining data”) of the rough machining in this shape portion is the sixth digit.
As shown in the figure, scanning is performed along the concave ridge line to stabilize the tool load and increase machining efficiency. The intersection line processing data is converted and created by the intersection line machining data creating means 5 for extracting and combining concave break points of the curved surface machining data for each scan.
It was decided regardless of the shape of 2. For this reason, when roughing is performed on the concave ridge line portion using such intersection line processing data, excessive cutting may occur depending on the left and right curved surface shapes forming the concave ridge line. This is because roughing along the ridge line at the concave ridge portion has a large cutting allowance, and machining by the tool side surface occurs. For example, as shown in FIG. 7, a case where the shape surface 1 on the right side with respect to the moving direction of the tool is close to the vertical (θ _R ) with respect to the horizontal plane and the shape surface 2 on the left side is close to the horizontal plane (θ _L ) When the rotation direction of the tool is determined in the right-hand screw direction with respect to the positive direction of the Z-axis so that the cutting direction becomes an upcut state on the right side of the cutting allowance, the tool is drawn into the inside of the work (right side) as shown in FIG. A cutting force _Ft occurs in the direction, and the tool is inclined and moves away from the designated tool position, resulting in excessive cutting of the shape surface 1.

Therefore, the operator of the digitized data processing device
After converting the intersection line processing data from the curved surface processing data,
The direction of the moving tool is checked for each scan based on the intersection line processing data, and the concave surface corresponding to each scan is formed by referring to the master model shape. There was a problem that the moving direction of the tool had to be changed so as to make a down cut.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a digitized data processing apparatus capable of automatically changing a moving direction of a tool in which excessive cutting is unlikely to be performed to intersection line processing data. Is to do.

(Means for Solving the Problems) The present invention inputs digitized data representing the master model shape obtained by scanning the master model shape, and converts the digitized data to represent a tool trajectory for machining a workpiece. The present invention relates to a digitized data processing apparatus for converting a digitized data representing a tool trajectory for machining this work into data to create a numerically controlled machining program, and the object of the present invention is included in the master model shape. Intersecting line processing data, which is digitizing data representing a tool trajectory for processing a workpiece along a concave ridge line, and curved surface processing, which is digitizing data representing a tool trajectory for processing a workpiece in a direction intersecting the concave ridge line Storage means for storing data, and a method for moving a tool based on the intersection line processing data Determining means for determining the main processing surface direction based on the intersection line processing data, based on the direction and the gradient of the left and right shape surfaces of the master model shape forming the concave ridge line based on the curved surface processing data; Input means for inputting a processing method, and comparing the processing method based on the processing surface direction and the tool rotation direction with the input processing method to determine whether conversion of the tool moving direction is necessary, and determining the determination. Conversion means for converting the tool moving direction of the intersection line processing data according to the result and storing the converted direction in the storage means.

(Operation) The digitizing data processing apparatus of the present invention uses the curved surface processing data that intersects the concave ridge line of the master model shape when the concave line exists in the master model shape and the intersection line processing data for processing the concave ridge line is created. The moving direction of the tool can be uniquely and automatically changed to the direction in which machining is performed in down-cut / amp-cut according to the intersection line machining data.

(Embodiment) FIG. 1 is a block diagram showing an example of a digitized data processing apparatus according to the present invention in correspondence with FIG. 3, and the same components are denoted by the same reference numerals and description thereof is omitted. Intersecting line processing data DI for processing along the concave ridge line existing in the master model shape stored in the digitized data storage means 2, and curved surface processing for processing the vicinity of the concave ridge line by a plurality of scans in a direction intersecting the concave ridge line Data DP is processing surface direction determination means 7
Is input to Then, the processing surface direction CD along the concave ridge line according to the intersection line processing data DI, that is, the left or right shape surface forming the concave ridge line, the surface having a large angle formed with the horizontal plane is moved rightward or leftward. Is determined according to the curved surface machining data DP and is sent to the tool moving direction converting means 8. On the other hand, the tool rotation direction TD for processing the workpiece based on the intersection line processing data DI is input from the tool rotation direction input means 9 to the tool moving direction conversion means 8, and the up-cut / down-cut processing method CM is input to the processing method input means. 10 is input to the tool moving direction conversion means 8. Then, based on the intersection line processing data DI from the digitized data storage means 2, the data of one scan corresponding to the processing of one concave ridge line is converted into the tool moving direction conversion means 8.
And the machining surface direction CD from the machining surface direction determination means 7
It is determined whether the machining realized by the tool rotation direction TD from the tool rotation direction input means 9 is an upcut or a downcut. If the determination result matches the processing method CM from the processing method input means 10, the input one-line intersection line processing data DI is sent to the digitized data storage means 2 as it is, and if the determination result does not match the processing method CM. The tool moving direction is inverted by the input one-line intersection data DI, and the one-line intersection data DI 'is sent to the digitized data storage means 2.

In such a configuration, this operation example will be described with reference to the flowcharts of FIGS. 2 (A) and 2 (B). The processing surface direction determination means 7 sequentially inputs data for one scan from the intersection line processing data DI from the digitized data storage means 2 (step S1), and left (right) to determine the processing surface direction CD for the scan. The side processing counter NL (NR) is set to zero (step S2). Determining a moving direction vector V _t of the tool at each constituent points P _i which constitutes one scan of data in the input line of intersection processed data DI (step S3), and all the digitized data storage means 2 of the curved surface machining data DP of scan configuration point Q to select the closest control points Q _j to the configuration points P _i (step S4). Scan containing the arrangement point Q _j intersects the凹稜line configuration point Q _j, the configuration point Q _j-1, Q _{j + 1} before and after the control points Q _j points on 2 shaped surface which constitutes the凹稜line It is. And the constituent points
The vector ▲ depends on whether the constituent points Q _j−1 and Q _{j + 1} are on the right or left side with respect to the moving direction vector V _t at P _i.
▼ and ▲ ▼ are the right side vectors V _R ,
It is determined as _VL along the left side (step S5). The transverse dimension along vector V _L, the angular V _R makes with the horizontal plane theta _L, evaluated theta _R (step S6), and the slope of the second shape surface of the right and left which constitutes the凹稜lines to be processed this. Next, the magnitudes of the angles θ _L and θ _R are compared, and the shape surface on the larger angle side is closer to vertical,
Since the processing surface direction CD is along the shape surface on that side (step S71), the processing counters NL and NR on that side are incremented by "1" (steps S72 and S73). It is checked whether or not this processing has been performed for all the constituent points of one scan of the input intersection processing data DI (step S8), and step S3 is performed until the processing is completed for all the constituent points of one scan of the intersection processing data DI. Steps S8 to S8 are repeated. When the processing has been completed for all the constituent points of one scan of the intersection line processing data DI, the left and right processing counters NL, N
The magnitude of R is compared (step S91), and the processed surface direction CD along the shape surface on the larger side is set (steps S92 and S93).

Further, the tool moving direction conversion means 8 determines whether or not the tool rotation direction TD from the tool rotation direction input means 9 is a right-handed screw rotation with respect to the positive direction of the Z axis (steps S101 and S10).
3) Combining the determination result with the processing surface direction CD of one scan, it is determined whether the processing method of one scan of the intersection line processing data DI currently being processed is down cut or up cut (steps S102 and S104). Then, the machining method CM from the machining direction input means 10 is compared with the machining method for one scan of the intersection line machining data DI recognized (steps S111 and S113). The CD is inverted and the inverted one-line intersection data DI 'is output to the digitized data storage means 2. If the two match, the currently processed one-line intersection data DI is currently processed. (Steps S112, S11
Four). Then, it is recognized whether or not the processing has been completed for all the scans of the intersection processing data DI (step S12). If the processing has not been completed for all the scans of the intersection processing data DI, the process returns to step S1 to return to the above-described processing. Is repeated, and when the processing is completed for all the scans of the intersection line processing data DI, all the operations are completed.

As described above, each scan data of the intersection line processing data for processing the concave ridge line of the master model shape along the concave ridge line is:
Each scan is converted into data having a tool moving direction that realizes a machining method instructed for up-cut or down-cut according to the gradient of the left and right shape surfaces forming the corresponding concave ridge line.

In the embodiment described above, the intersection line processing data DI
Has been described above, but the intersection line processing data creating means 5 is used by the curved surface processing data DP.
, And at the same time, the tool moving direction can be easily matched with the machining method CM.

(Effects of the Invention) As described above, according to the digitized data processing apparatus of the present invention, it is possible to automatically create intersection line processing data that enables optimal processing, thereby reducing the data editing work time for the operator. In addition to this, it is possible to prevent the occurrence of erroneous data due to an operator's operation error or the like, and to always perform good processing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a digitized data processing apparatus according to the present invention, FIGS. 2A and 2B are flowcharts for explaining an operation example thereof, and FIG. 3 is an example of a conventional digitized data processing apparatus. The block diagrams shown in FIGS. 4 to 8 are diagrams for explaining processing examples in which there is a problem. 1 digitizing data input means, 2 digitizing data storage means, 3 digitizing data offset means, 4 tool shape input means, 5 crossing machining data creating means, 6 digitizing data NC program conversion Means 7, working surface direction determining means 8, tool moving direction converting means 9, tool rotation direction input means 10, working method input means

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Katsuya Tanaka 5-25-25 Shimo-Koguchi, Oguchi-machi, Niwa-gun, Aichi Prefecture Inside Okuma Iron Works Co., Ltd. (56) References JP-A-3-62204 (JP, A)

Claims (1)

(57) [Claims] 1. Digitized data representing a master model shape obtained by scanning a master model shape is input and converted into digitized data representing a tool trajectory for machining a workpiece, and the workpiece is machined. In a digitizing data processing device that converts digitized data representing a tool trajectory to create a numerically controlled machining program, a tool trajectory for machining a workpiece along a concave ridge included in the master model shape is represented. Storage means for storing intersecting line processing data which is digitized data and curved surface processing data which is digitizing data for expressing a tool path for processing a workpiece in a direction intersecting the concave ridge line, and tool movement based on the intersecting line processing data Master model that forms a concave ridge line based on the direction and the curved surface processing data Than the slope of the right and left shaped surface Le shape,
Determining means for determining a main processing surface direction based on the intersection processing data; input means for inputting a tool rotation direction and a processing method based on the intersection processing data; and a processing method based on the processing surface direction and the tool rotation direction And converting means for comparing the input machining method with the input machining method to determine whether conversion of the tool moving direction is necessary, and converting the tool moving direction of the intersection line processing data according to the determination result and storing the converted tool moving direction in the storage means. A digitized data processing device comprising: