JP2003223208A - Numerical control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a numerical control system performing accurate and stable velocity control and calculating a highly precise interpolation point corresponding to machining shape data. <P>SOLUTION: The system comprises a shape data calculating part 13, which holds the entered machining data and calculates either an attribute data corresponding to the machining data or a coordinate data, on the path of a tool corresponding to the machining data and an interface which is laid between the shape data calculating part 13 and at least one of the functioning parts, except the shape data calculating part 13, the functioning parts being predefined so as to obtain necessary data from the shape data calculating part 13. <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 numerical control system for performing high-quality machining by connecting each functional section and a shape data calculation section with a predefined interface.

[0002]

2. Description of the Related Art FIG. 14 shows a conventional machine tool with a numerical control device (NC) and an NC program creating device (CAM: Computer Aided) arranged outside the NC machine tool.
FIG. 1 is a block diagram showing a processing system including a manufacturing system, in which 1 is a CA.
M, 2 are NC programs, 3 are input units, 4 are analysis units, 5
Is an acceleration / deceleration unit, 6 is an interpolation unit, and 7 is a servo control unit.

Next, the operation will be described. In FIG. 14, in order to perform machining with a conventional machine tool, first, an NC program 2 that describes how a tool operates with respect to a machining shape is required. Note that one instruction described in the NC program 2 is called a block. When performing die machining, the NC program 2 is generally generated by the CAM 1 arranged outside the NC machine tool. From the input section 3,
When the NC program 2 is input, the analysis unit 4 checks the degree of path change such as the angle between the given blocks and the curvature, and when the tool is moved along the command path at the feed speed given by the NC program 2. Then, it evaluates whether or not the machine performance is exceeded, and at points where the machine performance is exceeded, the feed speed is reduced so that the machine can pass within the machine performance. Decreasing the feed speed in this way is called clamping of the speed, and for example, a method as disclosed in JP-A-3-84604 (first prior art) or JP-A-2-137006 (second prior art). Has been published. Next, the acceleration / deceleration unit 5 determines the feed speed at each interpolation so that the clamp speed can be maintained at the clamp position based on the block information in which the feed speed is evaluated by the analysis unit 4,
Output to the interpolation unit 6. The interpolation unit 6 calculates the interpolation length per control cycle at the feed rate given by the acceleration / deceleration unit 5, interpolates on the block, and supplies the interpolated movement command to the servo control unit 7 for controlling the tool. To do. By the way, in the methods described in the first conventional technique and the second conventional technique described above, since the shape evaluation is performed based on the block described in the NC program 2, the evaluation result is NC.
CAM1 (programming system) installed outside
However, there is a problem in that it depends largely on the properties of the NC program 2 created in. That is, in CAM1,
In order to create the NC program 2 by dividing the tool path, which should originally be represented by a free curve, into a range that satisfies the tolerance (tolerance) set by the user, the information transmitted to the NC is lost, and the NC machine tool In some cases, the shape characteristics could not be reproduced, or the work piece was scratched minutely.

In order to solve such a problem, in Japanese Unexamined Patent Publication No. 1-98001 (third prior art), the feed rate is determined from the shape information from which the error is removed, so that the shape can be made almost global. In the case of the same, a method of making the feed rate the same is disclosed. In addition, Japanese Patent Laid-Open No. 2001-125
Japanese Laid-Open Patent Publication No. 616 (fourth prior art) discloses a method of correcting a minute zigzag in a minute line segment array, when the minute zigzag is detected. However, the third prior art aims at making the feed rates uniform and does not correct the command block. Therefore, when interpolation is performed at the determined feed rate, interpolation points are generated on blocks containing an error. There is no compensation. Further, in the fourth conventional technique, there is no compensation that the tool and the machining shape are in contact with each other when the tool is placed on the corrected path. Further, as described above, in the NC, since the processing for reducing the feed rate is performed at the point where the path changes abruptly, the feed rate is reduced at such a point.
The interpolation length represented by the product of the execution cycles dt becomes shorter. As a characteristic of the servo, when the feed speed is small, the followability is good and the reproducibility of the shape is improved. Therefore, in such a place, the command block needs to be sufficiently small compared to the interpolation length. However, if the command block is simply reduced, the amount of data of the NC program 2 becomes huge, so
The block analysis processing performed inside the NC as described above cannot be completed within the given execution time. In such a case, the NC automatically reduces the feed rate or skips the block, resulting in a problem on the machined surface. Therefore, in general, CA
When the NC program 2 is created by M1, the generated points are thinned while keeping the given tolerance so that the data amount does not become too large. However, if thinned out too much, the processed shape cannot be well represented. That is, the accuracy of the block generated by CAM1 and
There is a contradictory relationship with the number of blocks that can be processed by NC,
It can be said that it is not easy to generate the NC program 2 that represents the shape feature well and is realistic in terms of processing speed. In addition, as another problem, if the cutting amount is too large or if a route for machining using the full width of the tool is instructed, the load on the tool increases and the wear of the tool progresses quickly,
Problems such as chipping of the tool and fusion of chips on the tool occur. On the other hand, on the other hand, there are cases where the processing conditions can be increased. Conventionally, in order to cope with the problems that occur during such machining, the NC program 2 that has been once created must be discarded and the NC program 2 must be created based on new machining conditions such as reducing the depth of cut. I had to do it.

In order to make it possible to flexibly change the processing conditions during the processing as described above, for example, Japanese Patent Laid-Open No. 11-15513.
The publication (fifth prior art) discloses a system in which a processing unit that generates tool path data based on shape data and a cutting processing unit are simultaneously executed in parallel.

[0006]

Since the conventional numerical control system is configured as described above, the fifth conventional technique aims to flexibly change the processing conditions during processing, and therefore the numerical control is performed. It is a method to create tool path data on the device and input it to the control unit one after another. It is a technology to improve the accuracy of the machining surface, that is, speed control according to the shape and feed speed after acceleration / deceleration. However, there is a problem that there is no function for obtaining an accurate interpolation point at the position of the interpolation length using.

The present invention has been made to solve the above problems, and it is an object of the present invention to obtain a numerical control system for performing accurate and stable speed control according to machining shape data and highly accurate calculation of interpolation points. To aim.

[0008]

A numerical control system according to the present invention holds input machining shape data, attribute data corresponding to the machining shape data, and a processing operation unit corresponding to the machining shape data. Provided between the shape data calculation unit that calculates at least one of the coordinate data on the route, the shape data calculation unit, and at least one functional unit other than the shape data calculation unit. Is provided with an interface defined in advance so that necessary data can be obtained from the shape data calculation unit.

In the numerical control system according to the present invention, an interface is provided between the evaluation unit and the shape data calculation unit, and as its definition, the evaluation unit sends the shape data calculation unit to the route planning data of the processing unit. Parameter, the current evaluation point, the distance from the current evaluation point, the sampling interval, and information that specifies that the shape data calculation unit automatically determines an appropriate sampling interval. From the calculation unit to the evaluation unit, the coordinate value of the processing action unit, the parameter, the tangent vector, the curvature vector,
At least one of the above is obtained.

In the numerical control system according to the present invention, an interface is provided between the route planning unit and the shape data calculating unit, and as a definition, the route planning unit configures machining shape data to the shape data calculating unit. Information for defining at least one surface to be provided, and the path planning unit obtains the inclusion area from the shape data calculation unit.

In the numerical control system according to the present invention, an interface is provided between the route planning unit and the shape data calculating unit, and as a definition, the route planning unit configures machining shape data to the shape data calculating unit. At least one of the information defining at least one surface, the information defining at least one surface other than the surface forming the machining shape data, the information defining the machining type, and the machining Information related to the type is given, and the route planning unit obtains the route planning data from the shape data calculating unit.

The numerical control system according to the present invention holds the input machining shape data, attribute data corresponding to the machining shape data, coordinate data on the path of the processing action portion corresponding to the machining shape data, and Path planning data of the processing action part according to the machining shape data, evaluation data consisting of the moving speed of the processing action part according to the comparison of the route of the processing action part along the route planning data and the performance of the controlled object , A shape data calculation unit that calculates at least one of the shape data calculation unit, a shape data calculation unit, and at least one function unit other than the shape data calculation unit. An interface defined in advance so that necessary data can be obtained from the data calculation unit.

In the numerical control system according to the present invention, an interface is provided between the acceleration / deceleration unit and the shape data calculation unit, and as its definition, the acceleration / deceleration unit sends the shape data calculation unit a current interpolation point, Given the current parameter, the current feed speed, and the distance required for deceleration, the shape data calculation unit determines the most of the points where the acceleration / deceleration unit reduces the feed speed that precedes the current interpolation point within the distance required for deceleration. The distance to the point that reduces the feed rate in front, the reduced feed rate,
This is to obtain a detected or undetected identifier of the point at which the feed rate is reduced.

In the numerical control system according to the present invention, an interface is provided between the interpolation unit and the shape data calculation unit, and as its definition, the interpolation unit sends the shape data calculation unit a path plan data of the processing unit. Parameter, the current interpolation point, and the distance from the current interpolation point, and the shape data calculation unit to the interpolation unit determines the parameters of the coordinate values on the route of the processing action unit and the route plan data. At least one of them is obtained.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. Embodiment 1. 1 is a block diagram showing a numerical control system according to Embodiment 1 of the present invention. In FIG.
Reference numeral 11 denotes an input unit for inputting machining conditions together with machining shape data, and 12 supplies the machining shape data to a shape data calculation unit 13 and also generates path planning data for a tool (processing operation unit) of a machine tool (control target). The route planning unit 14 is a route planning data buffer that temporarily holds the generated route planning data. Reference numeral 15 is an evaluation unit that generates evaluation data according to the comparison between the tool path along the path plan data and the performance of the machine tool, and 16 is an evaluation data buffer that temporarily holds the generated evaluation data. Reference numeral 17 is an acceleration / deceleration unit that determines the movement speed at each interpolation so that a predetermined position can be passed at the evaluated movement speed based on the evaluation data. Reference numeral 18 is the movement speed determined by the acceleration / deceleration unit 17. Is an interpolating unit that calculates the amount of movement per unit time, determines the position of the tool, and outputs it to the servo control unit 19. The shape data calculation unit 13 holds the input machining shape data and executes various calculations according to the machining shape data.

Next, the operation will be described. In the first embodiment, the route planning unit 12 creates route planning data, and the shape data calculating unit 13 only obtains simple feature amounts other than the route. In FIG. 1, first of all, information accompanying the machining mode such as machining shape data, tool data, machining mode, information specifying the connection between pitch and cutting path plan data, etc. from the input unit 11, feed rate, spindle rotational speed, etc. Enter the processing conditions of. The route planning unit 12
The processed shape data is given to the shape data calculation unit 13, and the processed shape data is stored in the shape data calculation unit 13. In addition, the route planning unit 12 creates route planning data indicating in what pattern the tool should be moved to perform machining based on the input machining mode. Here, as shown in FIG. 2, the path planning data distinguishes between a parametric curve portion (hereinafter, referred to as a path planning path) representing a path that is a basis for calculating a path, a cutting process, and a rapid feed. It is assumed that it is a collection of data including information, command feed speed, spindle speed, and the like. For example, in the case of the scanning line processing mode for the entire area of the machining shape object as shown in FIG. 3, the path planning unit 12 uses a predefined “calculate the inclusion area of machining shape data” interface, The path planning unit 12 gives the shape data calculation unit 13 information that defines at least one surface forming the processed shape data, and the shape data calculation unit 13 acquires the inclusion area as shown in FIG. , Path planning data is created in parallel with the XY plane in the lowermost surface forming the inclusion area. Further, as the information associated with the scanning line machining mode, information for designating a machining direction such as a reciprocating path as shown in FIG. 3 or a unidirectional path as shown in FIG. Information such as whether to connect with a circular arc as shown in or to connect with a straight line as shown in FIG. 7 is included. Further, in the case of the machining along a surface as shown in FIG. 8, the specified surface is acquired by using a predefined “acquire specified surface” interface, and route planning data is created in the surface. To do. There are other correspondences of path planning data for various processing modes, but they are omitted because they do not affect the essence of the present invention. Further, the route planning data uses, for example, the parametric curve as a method of expressing the route that is the basis for calculating the route, but may be expressed by other means. For example,
Use the method of calculating the tool position by finding the intersection line (this intersection line becomes the tool path) between the offset surface, which is the outside of the radius of the ball end mill tool radius, and the tool operation surface including the tool center axis. In this case, information for uniquely determining the tool scanning plane, for example, when the tool scanning plane is a plane, one point on the plane and a normal vector may be used. At this time, in order to specify one point on the tool path, one end of the tool path is set as the parameter a and the other end is set as the parameter b, and a value between a and b is specified so that a unique point can be obtained. I'm good. When the processing is executed, the route planning unit 12
The look-ahead distance is calculated from the data that shows the performance such as the feed rate and the maximum allowable acceleration of the machine, and the path planning data with a length longer than the look-ahead distance is generated based on the above processing mode, and the path planning data buffer is created. Buffer to 14.

The evaluation unit 15 uses the route planning data buffer 1
4. Take route planning data from 4. In addition to the extracted route planning data, the evaluation unit 15 always holds the current evaluation position and the parameters of the route planning path. The evaluation unit 15 calculates the previously defined “path planning data, current parameters, and sampling intervals” by the shape data calculation unit 1
3 to calculate the position where the tool and the machining shape are in contact with each other at a given sampling interval along the path planning path and return the coordinate value and the curvature thereof ", and obtain the coordinate value and the curvature. Although the sampling is performed using the fixed sampling interval here, for example, the evaluation unit 15 causes the shape data calculation unit 13 to calculate the current evaluation point, the distance from the current evaluation point, and an appropriate sampling interval. Information for defining that the unit 13 automatically determines may be given, or the evaluation unit 15 may acquire the parameter or the tangent vector from the shape data calculation unit 13.
In the following, an example of an interface when the shape data calculation unit 13 automatically determines the sampling interval will be given. For example, when the automatic sampling-on information is passed as the information defining that the shape data calculation unit 13 automatically determines an appropriate sampling interval from the evaluation unit 15, when the shape data calculation unit 13 automatically samples each time. Assuming that the parameters and coordinate values of the route planning path of are stored, the interface at this time is set to "the shape data calculating unit 13 is given a flag of automatic sampling ON, and the route planning path is included in the route planning data. By calculating the position where the tool and the machining shape are in contact with each other at the given sampling interval and returning the coordinate value and curvature, the shape data calculation unit 13 automatically processes the machining shape with the required accuracy. Dynamically change a sufficient sampling interval for each request to provide coordinate values and the parameters of the path planning path that give those coordinate values. , It is possible to obtain a curvature. In addition, the route planning data is transferred from the evaluation unit 15 to the shape data calculation unit 13 every time.
In addition to the above, for example, an interface "gives route plan data to shape data calculation unit 13 to store and store (symbol I / A)" is defined, and unevaluated route plan data is first evaluated. A method may be adopted in which the shape data calculation unit 13 holds the path planning data to be evaluated only once. This interface and "The current parameters and sampling intervals are given to the shape data calculation unit 13, the positions where the tool and the machining shape are in contact are calculated at the given sampling intervals along the path planning path, and their coordinate values and curvatures are calculated. When the evaluation data is created using the "return (denoted by symbol I / B)" interface, the calling order of the interface is as follows. "IA" → "IB" → "IB" → "IB" → ... → "IB" → "IA" → "IB" → ... here The route plan data is updated at the timings of and, and each route plan data is evaluated by the "IB" interface following the. Next, evaluation section 1
Reference numeral 5 verifies whether or not it is possible to safely pass at the feed speed instructed by the user from the amount indicating the change in the path shape such as the curvature received from the shape data calculation unit 13 and the amount indicating the mechanical performance such as the allowable acceleration, The feed rate is reduced where it cannot pass at the commanded feed rate. Decreasing the feed rate in this way is called clamping, and the position to be clamped is called the clamp point or clamp position. For example,
If the curvature is used as the quantity representing the change in the path shape and the maximum allowable machine acceleration is used as the quantity representing the machine performance, the maximum feed rate within the machine performance can be obtained by the method disclosed in JP-A-2-137006. You can decide. The evaluation unit 15 sets the passing speed, the curvature, the coordinate value, and the parameter of the route planning path at each point evaluated in this way as a set and buffers them in the evaluation data buffer.

The accelerating / decelerating unit 17 constantly calculates the current interpolation position, the parameter corresponding to the current interpolation position, the current feed speed,
It holds the evaluation data used when obtaining the current interpolation point, and is preset using the current feed rate, the maximum feed rate override rate, the maximum allowable machine acceleration, and the control cycle. A distance required for deceleration (hereinafter referred to as deceleration distance) is calculated based on the acceleration / deceleration pattern. If the held evaluation data holds a reference to the clamp point, the distance to the clamp point is compared with the deceleration distance, and the current clamp speed is set at the clamp point. It is determined whether or not deceleration should be started from the position, and when it is determined that deceleration should be performed, the decelerated speed is obtained according to a preset speed pattern and is output to the interpolation unit 18. The interpolation unit 18 is the acceleration / deceleration unit 1
7, the current feed speed is received, the interpolation length per control cycle is calculated, and the previously defined “shape data calculation unit 1
The interpolation length is given to 3 to obtain the position of the interpolation length given from the current interpolation position on the tool path, and the coordinate value and the parameter of the path plan giving the position are returned to the interpolation unit 18. " Use the interface to get the interpolation points and parameters. Here, the route planning data created by the route planning unit 12 and the evaluation data created by the evaluating unit 15 are
It is generated at the time of machining so that the distance preceding the interpolation point (prefetch distance) can always be maintained so that at least the maximum speed of the machine can be reduced to the minimum speed. in this way,
In order to generate these data so as to keep a fixed amount prior to the interpolation, for example, the route planning unit 12 always uses the evaluation unit 1
Route planning data buffer 14 consumed by 5
Is monitored, and when the amount becomes equal to or less than a predetermined amount, route planning data is newly generated. The evaluation unit 15 also constantly monitors the evaluation data buffer 16 consumed by the interpolation unit 18, and newly generates evaluation data when the amount becomes less than a predetermined amount. Naturally, the interpolation points are also generated when the processing is executed. Further, in the first embodiment, as shown in FIG. 1, the shape data calculation unit 13 and the other functional units are realized on the same hardware. For example, as shown in FIG. , The shape data calculation unit 13 and other functional units are implemented on separate hardware, and the hardware is connected by a network or serial, and then the system is configured by using the interface defined above. You may.

As described above, according to the first embodiment, the shape data calculation unit 13 and each functional unit are connected using a pre-defined interface, so that the shape data calculation unit 13 and the functional units are directly connected to each other during shape evaluation. Since information from the shape data can be used, accurate and stable speed control is possible, and since the shape data can be directly interpolated during interpolation, highly accurate interpolation point calculation is possible. The effect is obtained.

Embodiment 2. In the second embodiment, the shape data calculation unit 13 creates path planning data and also returns a feature amount other than the coordinates. This Embodiment 2
The system configuration of is the same as that shown in FIG. 1 of the first embodiment. Further, as shown in FIG. 9 of the first embodiment, the shape data calculation unit 13 and other functional units may be realized on separate hardware. The difference from the first embodiment is that the route planning unit 12 and the shape data calculation unit 1 are different.
The difference is only the functional division with 3 and the interface defined between them. Only the points different from the first embodiment will be described below.

First, from the input section 11, machining shape data, tool data, machining mode, information accompanying the machining mode such as information defining the connection between the pitch and the cutting path plan data, the feed rate, the spindle rotational speed, etc. Enter the processing conditions. The route planning unit 12 uses the previously defined “shape data calculation unit 1
3 is given to the shape data calculation tool, the tool data, the processing mode, and information associated with the processing mode, and the information is stored in the shape data calculation unit 13. Store and hold those data. When the machining is executed, the path planning unit 12 calculates the look-ahead distance from the data indicating the performance such as the feed rate and the maximum allowable acceleration of the machine, and gives the pre-defined distance to the pre-defined "shape data calculation unit 13". Then, the route planning data having a length equal to or longer than the look-ahead distance is calculated according to the processing mode, and at least one or more route planning data is returned. For example, if the processing mode is the scanning line processing mode, and the information accompanying the scanning line processing mode is the pitch information between scanning lines, the cutting direction information, and the information designating reciprocating processing or unidirectional processing, these are passed. Define the interface. Also, when the processing mode is the contour line processing mode,
As accompanying information, contour line pitch information, orbiting direction information, information for designating contour orbiting priority as shown in FIG. 10 or island priority as shown in FIG. 11, and how to connect cutting path planning paths. Given the information to be designated, these are given to the shape data calculation unit 13 to define an interface for obtaining the route planning data. In addition, the route planning unit 12 instructs the shape data calculation unit 13 to define information for defining at least one surface forming the processed shape data and at least one surface other than the surface forming the processed shape data. At least one of the information to be provided, the information that defines the machining type, and the information that is associated with the machining type are given, and the shape data calculation unit 13 to the route planning unit 12 may be an interface that obtains the route planning data. .

As described above, according to the second embodiment, between the route planning unit 12 and the shape data calculation unit 13,
By connecting using a pre-defined interface, it is possible to create flexible and varied route planning data using shape data.

Embodiment 3. In the third embodiment, the shape data calculation unit 13 manages the route planning data and the evaluation data. FIG. 12 is a block diagram showing a numerical control system according to the third embodiment of the present invention, in which the shape data calculation unit 13 includes the function of the route planning unit 12 and the function of the evaluation unit 15, and the route planning data buffer 14 And the evaluation data buffer 16 are managed, and the acceleration / deceleration unit 17 and the interpolation unit 18 obtain necessary information using an interface defined in advance for the shape data calculation unit 13.

Next, the operation will be described. First, from the input section 11, processing shape data, tool data, processing mode, information related to the processing mode such as information that defines the connection between the pitch and the cutting path plan data, and the processing conditions such as the feed rate and the spindle rotation speed are set. It is input and stored in the shape data calculation unit 13 for storage. When the machining is executed, the route planning unit 12 calculates the look-ahead distance from the data indicating the performance such as the feed speed and the maximum allowable acceleration of the machine, and gives the pre-read distance to the predefined “shape data calculation unit 13”. Then, the route planning data having a length equal to or greater than the look-ahead distance is calculated according to the processing mode, and at least one or more route planning data is returned. Buffer. Next, the evaluation unit 15 takes out the route planning data from the route planning data buffer 14, gives the predefined “sampling interval to the shape data calculating unit 13 and gives it along the route planning path included in the route planning data. The coordinate value and the curvature are acquired using the interface which calculates the position where the tool and the machining shape are in contact with each other at the sampling interval and returns the coordinate value and the curvature. Here, although the sampling is performed using the fixed sampling interval, the sampling interval may be determined by another method, or the feature amount of the path shape other than the coordinate value and the curvature may be obtained. Next, verify whether the vehicle can safely pass at the feed speed commanded by the user based on the amount of change in path shape such as curvature and the amount of mechanical performance such as allowable acceleration. To clamp the feed rate. In this way, the shape data calculation unit 13 stores the evaluation values in the evaluation data buffer 16 as a set of the through acceleration, curvature, coordinate value and parameter at each evaluated point.

The acceleration / deceleration unit 17 always holds the current interpolation position, the parameter of the path planning path corresponding to the current interpolation position, and the current feed speed, and the current feed speed and the maximum of the current feed speed. A distance required for deceleration (deceleration distance) is calculated based on a preset acceleration / deceleration pattern using the override rate, the maximum allowable acceleration of the machine, and the control cycle. Next, by giving a pre-defined "current interpolation point, current parameter, current feed speed, and deceleration distance, the clamp point located closest to the deceleration interpolation point before the deceleration interpolation point is given. To the return value and the clamp point detection (identifier) as the return value. If there is no clamp point within the deceleration distance,
Using the interface that returns the clamp point undetected (identifier) to the return value, the distance to the clamp point and the clamp speed are acquired. When the clamp point is detected, it is decided whether or not to start deceleration from the current position so that the clamp speed is set at the clamp point, and if it is determined that the deceleration should be performed, it is set in advance. The speed decelerated according to the existing speed pattern is calculated and output to the interpolation unit 18.

The interpolation unit 18 receives the current speed from the acceleration / deceleration unit 17, calculates the interpolation length per control cycle, gives the interpolation length to the previously defined "shape data calculation unit 13, and calculates the current length. The position of the interpolation length given from the interpolation position is obtained along the route planning path, and the coordinate values and the parameters of the route planning data which gave the position are returned to the interpolating unit 18. And get.
Here, the route planning data created by the route planning unit 12 and the evaluation data created by the evaluation unit 15 are distances (prefetch distances) preceding the interpolation point so that at least the maximum speed of the machine can be reduced to the minimum speed. ) Generated during processing so that the minutes can always be kept. In order to generate these data so as to keep a certain amount of them prior to interpolation, for example, the shape data calculation unit 13 constantly monitors the route planning data buffer 14 that is consumed by the evaluation function to generate a predetermined amount. When the following occurs, the route planning data is newly generated. The evaluation unit 15 also constantly monitors the evaluation data buffer 16 consumed by the interpolation unit 18, and newly generates evaluation data when the amount becomes less than a predetermined amount. Naturally, the interpolation points are also generated when the processing is executed. The interpolation unit 18
From the shape data calculation unit 13 to the shape data calculation unit 13, at least one of the parameters of the path planning data of the processing action unit, the current interpolation point, and the distance from the current interpolation point is given. The interface 18 may be an interface for obtaining at least one of coordinate values on the route of the processing operation unit and parameters of the route planning data.
Further, in the third embodiment, as shown in FIG. 12, the shape data calculation unit 13 and the other functional units are realized on the same hardware.
As shown in, the shape data calculation unit 13 and other functional units are realized on separate hardware, and the two hardware are connected by a network or serial, and then the interface defined as above is used. The system may be configured as follows.

As described above, according to the third embodiment, the route planning unit 12 is configured by the above configuration.
Since it is possible to separate the functional unit that handles the information of the shape data such as the evaluation unit 15 and the functional unit that is in charge of the speed determination and the generation of the command value for the servo like the acceleration / deceleration unit and the interpolation unit 18, for example, the route The CAM maker provides the planning unit 12, the shape data calculation unit 13, and the evaluation unit 15, and the numerical control system provided by the numerical control maker can be constructed with the functional units after the acceleration / deceleration unit 17 and the interpolation unit 18. The effect of becoming is obtained. In such a numerical control system, since the information from the shape data can be directly used in shape evaluation, accurate and stable speed control can be performed, and the shape data can be directly corrected in interpolation. Since the interpolation can be performed, it is possible to calculate the interpolation points with high accuracy, and it is possible to use the various machining modes of the CAM maker.

[0028]

As described above, according to the present invention, the input machining shape data is held, and the attribute data corresponding to the machining shape data and the path of the processing action section corresponding to the machining shape data are stored. Is provided between the shape data calculation unit that calculates at least one of the coordinate data, the shape data calculation unit, and at least one functional unit other than the shape data calculation unit. Since it is configured to have a pre-defined interface so that necessary data can be obtained from the shape data calculation unit, at the time of shape evaluation, the attribute data from the shape data calculation unit according to the processed shape data can be directly input. Since it can be used, accurate and stable speed control is possible, and
At the time of interpolation, since the coordinate data from the shape data calculation unit corresponding to the processed shape data can be directly used,
There is an effect that it is possible to calculate a highly accurate interpolation point.

According to the present invention, the interface is provided between the evaluation unit and the shape data calculation unit, and as its definition, the evaluation unit sends the shape data calculation unit a parameter of the route planning data of the processing unit. , The current evaluation point, the distance from the current evaluation point, the sampling interval, and information that specifies that the shape data calculation unit automatically determines an appropriate sampling interval, and the shape data calculation unit Since the evaluation unit is configured to obtain at least one of the coordinate value, the parameter, the tangent vector, and the curvature vector of the processing action unit, the evaluation unit calculates the coordinate of the processing action unit from the shape data calculation unit. There is an effect that data such as a value, a parameter, a tangent vector, and a curvature vector can be accurately obtained.

According to the present invention, the interface is provided between the route planning unit and the shape data calculating unit, and as its definition, the route planning unit sends the shape data calculating unit to the shape data calculating unit.
Given the information defining at least one or more surfaces that form the processed shape data, the path planning unit from the shape data calculation unit is configured to obtain the inclusion area thereof, the path planning unit, the projection scan line, There is an effect that a simple path plan such as projection free curve path plan data can be created. Further, the route planning unit has an effect that the data of the inclusion area can be accurately obtained from the shape data calculation unit.

According to the present invention, the interface is provided between the route planning unit and the shape data calculation unit, and as its definition, the route planning unit sends the shape data calculation unit to the shape data calculation unit.
At least one of the information that defines at least one surface that forms the processing shape data and the information that specifies at least one surface other than the surface that forms the processing shape data, and the processing type Information and the information associated with the machining type are given, and the route planning unit is configured to obtain the route planning data from the shape data calculation unit, so the shape data calculation unit scans the lines, along the surface, the contour lines, the pencil,
There is an effect that route planning data corresponding to various processing strategies such as corner cutting can be obtained.

According to the present invention, the input machining shape data is held, the attribute data corresponding to the machining shape data, the coordinate data on the route of the processing action portion corresponding to the machining shape data, and the machining shape data thereof. Of the route plan data of the processing action part according to the, and the evaluation data consisting of the moving speed of the processing action part according to the comparison of the route of the processing action part along the route plan data and the performance of the controlled object, Is provided between the shape data calculation unit that calculates at least one of the shape data calculation unit and the shape data calculation unit, and at least one functional unit other than the shape data calculation unit. Since it is configured to have a pre-defined interface so that the necessary data can be obtained from, the function that handles the information of the shape data such as the route planning section and the evaluation section. And a functional unit such as an acceleration / deceleration unit and an interpolating unit, which is in charge of speed determination and servo command value generation, can be separated. For example, a CAM maker provides a shape data calculation unit, a route planning unit, and an evaluation unit. However, it is possible to construct a numerical control system in which the numerical control maker provides functional units after the acceleration / deceleration unit and the interpolation unit. Further, at the time of shape evaluation, since the attribute data from the shape data calculation unit corresponding to the processed shape data can be directly used, accurate and stable speed control can be performed, and at the time of interpolation, Since the coordinate data from the shape data calculation unit corresponding to the processed shape data can be directly used, it becomes possible to calculate an interpolation point with high accuracy.
This has the effect of being able to use the various processing modes that AM makers have.

According to the present invention, the interface is provided between the acceleration / deceleration unit and the shape data calculation unit, and as its definition, the acceleration / deceleration unit sends the shape data calculation unit a current interpolation point and a current parameter. The current feed speed and the distance required for deceleration are given, and the shape data calculation unit causes the acceleration / deceleration unit to reduce the feed speed before the current interpolation point within the distance required for deceleration. Since it is configured to obtain a distance to a point at which the feed rate is reduced, the reduced feed rate, and the detected or undetected identifier of the point at which the feed rate is reduced, in the acceleration / deceleration unit, within the distance required for deceleration. The distance to the foremost feed rate reducing point before the current interpolation point, the reduced feed rate, and the detected or undetected identifier of the feed rate reducing point are Got exactly There is that effect.

According to the present invention, the interface is provided between the interpolating unit and the shape data calculating unit, and as its definition, the parameter from the interpolating unit to the shape data calculating unit is used as a parameter of the route planning data of the processing operation unit. At least one of the current interpolation point and the distance from the current interpolation point is given, and the shape data calculation unit to the interpolation unit determines at least one of coordinate values on the route of the processing action unit and parameters of the route planning data. Since it is configured to obtain either one of them, the interpolating unit has an effect of accurately obtaining the coordinate values on the route of the processing action unit and the parameters of the route planning data.

[Brief description of drawings]

FIG. 1 is a block diagram showing a numerical control system according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing route planning data.

FIG. 3 is an explanatory diagram showing a scanning line processing mode (reciprocating).

FIG. 4 is an explanatory diagram showing a processed shape and an inclusion area.

FIG. 5 is an explanatory diagram showing a scanning line processing mode (one direction).

FIG. 6 is an explanatory diagram showing information that connects cutting path planning paths with arcs.

FIG. 7 is an explanatory diagram showing information for connecting cutting path planning paths with straight lines.

FIG. 8 is an explanatory diagram showing a processing mode along a surface.

FIG. 9 is a block diagram showing another example of the numerical control system according to the first embodiment of the present invention.

FIG. 10 is an explanatory diagram showing information for designating a contour orbit priority.

FIG. 11 is an explanatory diagram showing information designating island priority.

FIG. 12 is a block diagram showing a numerical control system according to a third embodiment of the present invention.

FIG. 13 is a block diagram showing another example of the numerical control system according to the third embodiment of the present invention.

FIG. 14 is a conventional machine tool with a numerical control device and NC.
It is a block diagram which shows the machining system comprised from the NC program creation apparatus arrange | positioned outside the machine tool.

[Explanation of symbols]

11 input unit, 12 route planning unit, 13 shape data calculation unit, 14 route planning data buffer, 15 evaluation unit,
16 evaluation data buffer, 17 acceleration / deceleration unit, 18 interpolation unit, 19 servo control unit.

Claims (7)

[Claims] 1. An input unit for inputting processing conditions such as a type of processing, a type of a processing action section to be controlled, a moving speed of the processing action section, and the like, together with the processing shape data, and the input data from the input section. According to a comparison between the performance of the control target and the route of the processing action unit along the route planning data generated by the route planning unit, the route planning unit that generates the route plan data of the processing action unit, Based on the evaluation data generated by the evaluation unit that determines the moving speed at the position exceeding the performance and generates the evaluation data composed of the position and the parameter of the position and the moving speed,
An acceleration / deceleration unit that determines the movement speed at each interpolation so that the vehicle can pass a predetermined position at the evaluated movement speed, and a movement amount per unit time is calculated using the movement speed determined by the acceleration / deceleration unit. Then, the interpolation section that determines the position of the processing action section and outputs it to the servo control section, and the input machining shape data are held, and the attribute data according to the machining shape data and the machining shape data according to the machining shape data are held. Between the shape data calculation unit that calculates at least one of the coordinate data on the path of the processing operation unit, the shape data calculation unit, and at least one functional unit other than the shape data calculation unit. And a numerical control system provided with the above-mentioned functional units, the interface being defined in advance so that necessary data can be obtained from the shape data calculation unit. 2. The interface is provided between the evaluation unit and the shape data calculation unit, and as its definition, the evaluation unit sends the shape data calculation unit a parameter of the route planning data of the processing operation unit, the current At least one of the evaluation point, the distance from the current evaluation point, the sampling interval, and the information defining that the shape data calculation unit automatically determines an appropriate sampling interval is given, and the shape data calculation unit The numerical control system according to claim 1, wherein the evaluation unit obtains at least one of a coordinate value, a parameter, a tangent vector, and a curvature vector of the processing action unit. 3. The interface is provided between the route planning unit and the shape data calculation unit, and as its definition, at least one that forms machining shape data from the route planning unit to the shape data calculation unit. The numerical control system according to claim 1, wherein information for defining the above surfaces is given, and the path planning unit obtains the inclusion area from the shape data calculation unit. 4. The interface is provided between the route planning unit and the shape data calculation unit, and as its definition, at least one of the processing plan data is configured from the route planning unit to the shape data calculation unit. At least one of the above information defining the surface and the information defining at least one surface other than the surface forming the processing shape data, the information defining the processing type, and the information associated with the processing type. The numerical control system according to claim 1, wherein the route planning unit obtains route planning data from the shape data calculation unit. 5. An evaluation part based on the evaluation data together with an input part for inputting processing conditions such as the type of processing, the type of a processing action part to be controlled, and the moving speed of the processing action part together with the processing shape data. An acceleration / deceleration unit that determines the movement speed at each interpolation so that the vehicle can pass a predetermined position at a different movement speed, and a movement amount per unit time is calculated using the movement speed determined by the acceleration / deceleration unit, An interpolation unit that determines the position of the processing action unit and outputs it to the servo control unit, and holds the input machining shape data, attribute data according to the machining shape data, and the processing action according to the machining shape data. Coordinate data on the route of the part, route planning data of the processing action part according to the machining shape data, the route of the processing action part along the route plan data and the performance of the controlled object according to the comparison. processing A shape data calculation unit that calculates at least one of evaluation data composed of the moving speed of the action unit, the shape data calculation unit, and at least one functional unit other than the shape data calculation unit. A numerical control system provided between the functional units, and an interface defined in advance so that necessary data can be obtained from the shape data calculation unit. 6. The interface is provided between the acceleration / deceleration unit and the shape data calculation unit, and as a definition thereof, a current interpolation point, a current parameter, and a current parameter from the acceleration / deceleration unit to the shape data calculation unit. The current feed speed and the distance required for deceleration are given, and the shape data calculation unit causes the acceleration / deceleration unit to reduce the feed speed before the current interpolation point within the distance required for deceleration to the frontmost point. The numerical control system according to claim 5, wherein a distance to a point at which a feed rate is reduced, a reduced feed rate, and a detected or undetected identifier of the point at which the feed rate is reduced are obtained. 7. The interface is provided between the interpolation unit and the shape data calculation unit, and as its definition, the interpolation unit sends the shape data calculation unit a parameter of the path planning data of the processing unit, the current At least one of the interpolation point and the distance from the current interpolation point is given, and the shape data calculation unit to the interpolation unit determine the coordinate values on the route of the processing action unit and the parameters of the route planning data. The numerical control system according to claim 1 or 5, wherein at least one of the above is obtained.