JPH0866844A - Numerical control device - Google Patents

Abstract

PURPOSE: To enable generation of a tool path that is optimized for eliminating losses to be carried out in accordance with changes due to machining in the shape of a material to be cut by providing an outside envelope generation means which generates an envelope that is offset outward by a predetermined length from another generated by an inner envelope re-generation means, for using the former envelope as the tool path. CONSTITUTION: An inner envelope generation means 4 generates an envelope in accordance with information input from input means 1, 2 about the shape and machining of a pocket, the envelope being offset inward from the outer shape of the pocket by a length from a tool radius. An inner envelope re-generation means 5 generates an envelope which is offset further inward by the length of the tool radius from the envelope generated by the inner envelope generation means 4. An outer envelope generation means 6 generates, in accordance with information about the envelope generated by the inner envelope re-generation means 5 and about the machining, an outer envelope which is offset outward from the envelope by a predetermined length, and the outer envelope is used as a tool path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical controller for controlling machine tools, robots, etc. based on numerical data.

[0002]

2. Description of the Related Art FIG. S. Pat. No. 4,
It is a flowchart which shows the conventional numerical control apparatus shown by the 907,164 publication. In the figure, 121 is a block in which the user decides a machining area and machining conditions, 122 is a block for generating a tool path for machining the machining area, and 123 is a block for optimizing the tool path. 1
Reference numeral 24 is a block for optimizing the tool path for preventing the generation of the tool blade mark at the machining end point in the tool path.

Next, the operation will be described. First, the "island shape part" that avoids machining, the "machining area" that excludes the part that fixes parts, the "tool radius" and the "pick feed" that is the cutting width, and the "remaining margin" at the time of rough machining Is defined by the user. A tool path is generated by offsetting from the defined outer shape of the machining area by a pick feed amount while avoiding the non-machining area. Further, at the machining start point and machining end point in the generated tool path, the tool path is optimized so that the machining is started in the tangential direction with respect to the tool path and the machining is ended in the tangential direction.

FIG. 43 shows a U.S.P. S. Pat. No. 4,8
It is a block diagram which shows the conventional numerical control apparatus shown by the 33,617 publication. In the figure, reference numeral 131 is a block for inputting a numerical control program (hereinafter referred to as an NC program), a work material, a work material fixture and a part shape and performing an NC simulation using a solid model. 132
Is data relating to processing conditions. Reference numeral 133 is data of tools and machine tools for obtaining optimum machining conditions in each machining. Reference numeral 134 denotes a block 131 for performing NC simulation, data 132 regarding machining conditions, and optimum machining condition data 13 for each machining of the tool and the machine tool.
3 is a block for optimizing machining force and tool feed speed.

Next, the operation will be described. First, the NC program, the work material, the work material fixture, and the shape of the part are input to the block 131 for performing the NC simulation. NC
The simulation block 131 uses a solid model to model and NC the work material and work material fixture.
Supports programming and simulates part shape during machining. Then, the basic tool feed rate is determined from the material properties of the data 132 and data empirically required. Further, block 134 is block 131
By using the solid model and the data 132 on the machining conditions and the data 132 on the performance of the tool and the machine tool and the material properties 133, the solid model is used to machine from the sweep shape of the tool and the shape of the work material in the tool path of a predetermined length. The material removal volume is determined, compared with the reference volume, and the reference tool feed rate is overridden to optimize the tool feed rate within the constraints determined by the user.

[0006]

Since the conventional numerical control device is constructed as described above, the tool path is simply offset by a predetermined amount from the outside to the inside based on the outer shape of the pocket. The tool path is generated without considering the shape of the work material that changes as the machining progresses, and includes parts where no cutting is done, such as air-cutting parts and parts where the pick feed is not constant. Therefore, there is a problem that the tool path is not optimized for the shape of the work material.

Further, conventionally, when determining the tool feed rate so that the machining load is constant, the tool feed rate is determined based on the removal volume of the work material with respect to the tool path per predetermined length. However, if the work material changes with the progress of processing, depending on the shape of the work material, there will be a thin material processing state where the work material shape becomes thin or a corner processing state where a corner is processed. . In that case, if the tool feed speed is determined based only on the removal volume of the work material with respect to the tool path per predetermined length, it will not be the optimum machining conditions for the work material. Therefore, there is a problem that the accuracy of the machined surface is adversely affected.

The invention of claim 1 has been made to solve the above problems, and it is possible to generate an optimized tool path with little waste in consideration of a change in shape of a work material due to machining. The purpose is to obtain a numerical control device capable of performing.

A second aspect of the present invention provides a numerical controller capable of efficiently generating a tool path by dividing an optimized tool path in consideration of a shape change of a work material due to machining. With the goal.

It is an object of the present invention to obtain a numerical controller capable of generating an accurate envelope as a tool path.

It is an object of the present invention to provide a numerical control device capable of avoiding the generation of an envelope curve as a tool path that interferes with the island shape in machining a pocket shape including the island shape.

It is an object of the present invention to provide a numerical controller capable of efficiently generating an envelope as a tool path even when the envelope has a plurality of independent loops.

It is an object of the invention of claim 6 to obtain a numerical control device capable of performing machining under machining conditions optimized in accordance with the shape of a work material that changes due to machining.

It is an object of the invention of claim 7 to obtain a numerical control device capable of performing machining under machining conditions optimized in accordance with the shape of a work material that changes due to machining.

It is an object of the present invention to provide a numerical control device capable of performing machining under machining conditions optimized according to the shape of a work material that changes due to machining.

It is an object of the present invention to provide a numerical controller capable of performing machining under machining conditions optimized according to the shape of a work material that changes due to machining.

It is an object of the invention of claim 10 to obtain a numerical control device capable of setting machining conditions in consideration of a change in shape of a work material due to machining.

It is an object of the invention of claim 11 to obtain a numerical control device capable of setting machining conditions such as a tool feed speed in consideration of a shape change of a work material due to machining.

It is an object of the present invention to provide a numerical control device capable of realizing machining without a residual portion where a tool does not enter.

[0020]

According to a first aspect of the present invention, there is provided a numerical control device which generates a pocket-shaped inner envelope which is offset from the pocket shape input by the shape input means to the inside by the length of the tool radius. An inner envelope generating means as a path, and a re-inner envelope generating means for generating an envelope further offset to the inside by the length of the tool radius from the pocket-shaped inner envelope generated by the inner envelope generating means, Outer envelope generating means for generating a tool path by generating an envelope which is offset from the envelope generated by the inner-side envelope generating means to the outside by a predetermined amount, and an envelope generated by the outer envelope generating means. The line is provided with an input unit for generating an envelope in the re-inner envelope generating unit.

A numerical controller according to a second aspect of the present invention is a shape expressing means for expressing the shape of a work material and the shape of a tool,
An inner envelope generating means for generating a tool path by generating an envelope that is offset from the pocket outer shape input by the shape input means by the length of the tool radius, and a sweep shape when the tool is moved according to the tool path. Sweep shape generation means for generating, sweep shape removal means for removing the sweep shape from the work material shape, and removal of the work material shape by the sweep shape on a plane parallel to the plane defining the pocket shape. Offset envelope generating means for generating an envelope that is offset by a predetermined amount from the region, and the envelope is divided into blocks to be a tool path, and the tool path of the divided envelope in the sweep shape generating means. An envelope dividing means that is a tool path for generating a sweep shape, and a tool path connecting means that connects the envelopes divided by the envelope dividing means A.

According to a third aspect of the present invention, there is provided a numerical controller according to a third aspect of the present invention, which is based on a line for which an envelope is to be generated and which has a radius of the same length as the offset length when the envelope is generated. A sweep shape generating means for generating a sweep shape and a sweep shape generated by the sweep shape generating means are sliced on a plane parallel to a plane defining a pocket shape, and two cross-section lines are formed from the cross section of the sweep shape. A cross-section line generating means for generating the cross-section line, the cross-section line inside the two cross-section lines is generated as an inner envelope line, and the cross-section line outside the two cross-section lines is an outer envelope line, A tool path is generated based on these envelopes.

According to a fourth aspect of the present invention, in a numerical control device, an island-shaped envelope which is offset from the island shape in the pocket shape by the length of the tool radius and an inner envelope generating means or an outer envelope generating means. It is provided with an interference avoiding envelope generating means for determining whether or not the generated envelope will cause interference, and in the case of causing interference, generate a new envelope avoiding interference and use it as a tool path. .

According to a fifth aspect of the present invention, there is provided a numerical control device, wherein in the generation of the envelope curve offset by the length of the tool radius inward by the inner curve envelope generation means, the envelope curve is 2
Envelope storage means for storing the remaining loops excluding the loop for generating the envelope by the outer envelope generation means when having more than one loop, and generated by the re-inner envelope generation means When there is no envelope that is offset by the length of the tool radius to the inside, the envelope is generated based on another loop stored in the envelope storage means to form a tool path. Is.

A numerical controller according to a sixth aspect of the present invention is a shape expressing means for expressing the shape of a work material and the shape of a tool,
A work material shape changing means that changes the shape of the work material while moving the tool inside the computer by performing a simulation based on the tool movement command data for moving the tool, and the position of the tool and the surrounding work material Recognition means for recognizing the shape,
And a machining condition changing means for changing the machining condition according to the recognition result by the recognition means.

A numerical controller according to a seventh aspect of the present invention cuts a work material around the tool based on the recognized tool position, and recognizes the shape of the work material around the tool based on the cut work material shape. The recognition means and the machining condition changing means for changing the machining condition according to the shape of the work material around the tool recognized by the recognition means are provided.

A numerical controller according to an eighth aspect of the present invention is a recognition means for recognizing a shape of a work material around a tool based on a cross-sectional shape when the shape of the work material around the tool is cut along a plane, and the recognition means. The machining condition changing means for changing the machining conditions according to the shape of the work material around the tool recognized by.

A numerical controller according to a ninth aspect of the present invention sets a vector from the position of the tool, and based on the geometrical data and position data of the work material intersecting the set vector, the workpiece around the tool is cut. A recognition means for recognizing the material shape and a machining condition changing means for changing the machining condition according to the shape of the work material around the tool recognized by the recognition means are provided.

A numerical controller according to a tenth aspect of the present invention is
Recognition means for recognizing the shape of the work material around the tool based on the contact area of the tool with respect to the work material and the contact position of the tool with respect to the work material, and the work material around the tool recognized by the recognition means And a processing condition changing means for changing the processing condition according to the shape.

A numerical controller according to the invention of claim 11 is
A unit cutting amount calculation unit for calculating the cutting amount per unit length of the tool path based on the recognition result of the position of the tool by the recognition unit and the shape of the surrounding work material, and the position of the tool by the recognition unit The thickness recognition means for recognizing the thickness of the non-cutting portion of the work material based on the recognition result of the shape of the surrounding work material, and the feed rate when the cutting amount calculated by the unit cutting amount calculation means is large. A tool feed rate change in which the feed rate is increased when the cutting amount is small, the feed rate is increased when the cutting amount is small, the feed rate is increased when the thickness recognized by the thickness recognizing means is thick, and the feed rate is decreased when the thickness is thin. And means.

A numerical controller according to a twelfth aspect of the invention is
Removal area setting means for setting an area to be cut and removed from the input pocket shape, and whether or not a residual portion is generated based on the removal area set by the removal area setting means and the processing information input by the processing information input means. And the pocket shape region where the residual portion determined to be generated by the residual portion determination means is formed, the corrected shape generated based on the tool path is overlaid, and the pocket shape is determined. It is provided with a shape correcting means for correcting and a structure for generating an envelope for processing the pocket shape corrected by the shape correcting means.

[0032]

According to the invention of claim 1, the outer envelope generating means is based on an envelope curve showing a shape change of the work material which is offset inward by the length of the tool radius generated by the inner envelope generating means. By generating the path, it is possible to generate a tool path in consideration of the shape change of the work material due to machining, and realize the generation of the tool path optimized according to the shape change of the work material with less waste.

According to a second aspect of the present invention, the tool path connecting means is divided into blocks by offsetting a predetermined amount from a region where the sweep shape of the tool shape is removed on a plane parallel to the plane defining the pocket shape. The generated envelopes are connected to form a tool path, and efficient tool path generation is realized.

The numerical controller according to the invention of claim 3 is
Based on the line for which the envelope is to be generated, generate a swept shape of a cylinder having a radius of the same length as the offset length when generating the envelope, and define the generated swept shape as the pocket shape. Sliced in a plane parallel to the plane to be cut, and two cross-section lines are generated from the cross-section when the swept shape is sliced, and the cross-section line inside the two cross-section lines is the inner envelope, and A cross-section line outside the cross-section line of the book is generated as an outer envelope curve to realize accurate generation of the envelope curve.

The interference avoidance envelope generating means in the invention of claim 4 is an island-shaped envelope generated by offsetting from the island shape to the outside by the length of the tool radius, and only the length of the tool radius to the inside of the pocket shape. Determine whether the envelope generated by offsetting causes interference, when causing interference, as a tool path to generate a new envelope avoiding interference with the island shape different from the envelope, A tool path is generated that avoids interference with the island shape.

The numerical controller according to the invention of claim 5 is
When the envelope has two or more loops, the remaining loops except one loop for generating the envelope are stored, and the generation of the envelope for the one loop is completed. Then, by further generating an envelope based on the other stored loop and generating a tool path, the envelope can be efficiently generated as compared with the case where the envelope has a plurality of independent loops. To do.

The machining condition changing means in the invention of claim 6 is optimized based on the recognized position of the tool and the shape of the surrounding work material, and which is optimized in accordance with the shape of the work material changed by the working. Select conditions and enable good processing with optimized processing conditions.

The machining condition changing means in the invention of claim 7 cuts the work material around the tool at the recognized position of the tool, recognizes the shape of the cut work material, and changes the shape of the work material by machining. Optimum processing conditions are selected according to the requirements, and good processing is possible with the optimized processing conditions.

The machining condition changing means in the invention of claim 8 is based on the shape of the work material which changes as the machining progresses, which is recognized by the sectional shape when the shape of the work material around the tool is cut by a plane. Select the optimum processing conditions and enable good processing under the optimized processing conditions.

The machining condition changing means in the invention of claim 9 sets a vector in an arbitrary direction from the position of the tool, and changes it by machining recognized from the geometric data and position data of the work material intersecting the set vector. Optimum machining conditions are selected based on the shape of the work material to be processed, and good machining is possible under the optimized machining conditions.

The machining condition changing means in the tenth aspect of the invention selects an optimum machining condition based on the contact area between the work material and the tool during machining and the contact position of the tool with respect to the work material. Enables good processing with optimized processing conditions.

The machining condition changing means in the invention of claim 11 calculates the cutting amount per unit length of the tool moving path, reduces the feed rate when the calculated cutting amount is large, and when the cutting amount is small. Changes the shape of the work material by machining by increasing the feed speed, further increasing the feed speed when the thickness of the non-cutting region of the work material is thick and decreasing the feed speed when the thickness is thin. Then, the cutting amount is adapted especially to the state of thin material processing, and good processing can be performed under optimized processing conditions.

The shape correction means in the twelfth aspect of the invention, when it is determined that a residual portion will occur in the removed area, performs the correction by superimposing the corrected shape on the area where the residual portion is determined to occur, and this correction is performed. It is possible to generate a tool path in which a residual portion does not occur with respect to a removal region where the shapes are overlapped, and to perform machining without a residual portion.

[0044]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the main part of the numerical controller according to the first embodiment. In the figure, 1 is a shape input means for inputting the shape of a pocket to be processed. Two
Is a machining information input means for inputting machining information such as tool shape and pick feed. Reference numeral 3 is a tool path generating means including an inner envelope generating means 4, a re-inner envelope generating means 5, an outer envelope generating means 6 and an input means 7. The inner envelope generation means 4 is offset from the outer shape of the pocket to the inside by the length of the tool radius based on the information about the shape and processing of the pocket input from the shape input means 1 and the processing information input means 2. It is a means for generating an envelope and using the envelope as a tool path. The re-inner envelope generating means 5 is means for generating an envelope further offset from the envelope generated by the inner envelope generating means 4 by the length of the tool radius. Outer envelope generating means 6
Generates an outer envelope that is offset from the envelope by a predetermined amount to the outside from the envelope generated by the inner envelope generator 5 and the processing information, and uses the outer envelope as a tool path. Is a means to do. The input means 7 is means for inputting the outer envelope generated by the outer envelope generating means 6 to the re-inner envelope generating means 5.

FIG. 2 is a flow chart showing the operation of this numerical controller. FIG. 3 is an explanatory view specifically showing the operation shown in the flowchart of FIG. 2, where 8 is a pocket outer shape and 9 is a tool path generated in the pocket outer shape.

Next, the operation will be described. According to the flowchart of FIG. 2, first, information about the pocket outer shape as the pocket shape and information about the tool shape and the pick feed used by the outer envelope generating means 6 as the processing information are input (step ST1). Then, the envelope a which is offset by the tool radius r inside the pocket outline is generated from the input information about the pocket outline and the tool form (step ST2). This state is shown in FIG. Then, this envelope a is used as a tool path (step ST3), and then an envelope b offset from the envelope a inward by the tool radius r is generated (step ST4). This state is shown in FIG.
Then, the envelope c is generated by offsetting the pick feed and the tool shape by a predetermined distance d from the envelope b to the outside (direction of the pocket outer shape 8) (step ST5).
This state is shown in FIG. Further, this envelope c is set as one of the tool paths (step ST6), and it is determined whether or not the next tool path needs to be generated (step ST6).
7) If necessary, the process returns to step ST4, and the next envelopes c ′, c ″ ... Are obtained based on the envelope c generated in step ST5.

In steps ST3 and ST6, the input envelope is output as generated tool path information. If it is determined in step ST7 that the next tool path is not to be generated, the process ends. As a result,
When these series of processing are completed, as shown in FIG. 3D, the pocket outer shape 8 is a, c, c ′, c ″.
An envelope curve such as is generated as the tool path 9.

Therefore, according to this embodiment, an envelope curve which is offset inward by the length of the radius r of the tool from the envelope curve corresponding to the previous tool path is generated, and the next tool path is generated based on the envelope curve. Is generated by offsetting a predetermined distance to the outside, so tool paths are sequentially generated according to changes in the shape of the work material due to machining, and the work material that changes as the machining progresses. The tool path optimized for the shape can be generated, and the tool path can be efficiently generated.

Example 2. FIG. 4 is a block diagram showing the configuration of the main part of the numerical controller according to the second embodiment. 4, parts that are the same as or equivalent to those in FIG. 1 are given the same reference numerals and explanations thereof are omitted. In the figure, reference numeral 21 is a shape expressing means for expressing the shape of the work material and the tool shape by a computer. Reference numeral 22 denotes an inner envelope generating means 23 for generating an inner envelope from the pocket outer shape input from the shape input means 1, a sweep shape generating means 24, a sweep shape removing means 25, an offset envelope generating means 26, and an envelope dividing means. It is a tool path generation means having 27 and a tool path connection means 28.

The inner envelope generating means 23 includes the shape of the work represented by the shape expressing means 21 and the shape inputting means 1.
It is a means for generating an envelope curve offset from the pocket contour shape inward by the length of the tool radius based on the pocket contour shape input by, and setting it as a tool path. The sweep shape generating means 24 is means for generating a sweep shape of the tool shape from the input tool path. The sweep shape removing means 25
It is a means for removing the sweep shape of the tool shape generated by the sweep shape generating means 24 from the work material shape. The offset envelope generating means 26 creates an envelope which is offset by a predetermined amount from a region on a plane parallel to the plane defining the pocket shape of the work material shape whose sweep shape has been removed by the sweep shape removing means 25. It is a means to generate. The envelope dividing unit 27 is a unit that divides the envelope generated by the offset envelope generating unit 26 into a predetermined number of blocks to form a tool path. The tool path connecting means 28 is means for selecting and connecting an appropriate tool path from the tool paths of the envelope divided by the envelope dividing means 27.

FIG. 5 is a flow chart showing the operation of this numerical controller. FIG. 6 is an explanatory view specifically showing the operation shown in the flowchart of FIG. 5, 11 is a tool shape,
Reference numeral 12 indicates a movement path of the tool, 13 indicates a sweep shape by the tool when the tool shape 11 is moved, and 14 indicates a pocket outer shape.

Next, the operation will be described. In FIG. 5, first, as the pocket shape, the outer shape of the pocket is input from the shape input means 1 and the processing information is input from the processing information input means (step ST20). Next, the shape of the work material and the shape of the tool are expressed by the computer from the input processing information (step ST21). Further, an envelope curve offset from the outer shape of the pocket by the length of the tool radius is generated and used as a tool path (step ST22). Next, a sweep shape of the tool shape is generated from the tool path (step ST23). This sweep shape 13 is shown in FIG. Subsequently, the generated sweep shape 13 of the tool shape is removed from the work material shape (step ST24). This state is shown in FIG.

Then, it is judged whether or not the shape in the pocket from which the sweep shape 13 of the tool shape has been removed has reached the pocket shape in which the shape of the work material does not remain (step ST25). When it is determined that the arrival has been reached, the processing ends. If it has not arrived, the process of step ST26 is performed.

In this step ST26, a new envelope e is generated on the plane parallel to the plane defining the pocket shape 14 with a predetermined length d offset from the area where the shape of the workpiece is removed ( Step ST26). This state is shown in FIG. Next, the envelope is divided into a predetermined number of blocks to form a tool path (step ST27),
The divided tool paths are connected so as to be an efficient tool path (step ST28). Then, the process returns to step ST23 again, this time, the sweep shape of the tool shape is generated from the tool path in step ST28, and the processing from step ST24 is repeated until the shape of the work material reaches the desired pocket shape.

FIG. 7 shows the tool path 9 generated in this way, which is a tool movement path for efficiently cutting the inside of the pocket shape to reach the target pocket shape 14.

Therefore, according to this embodiment, the tool path is generated according to the change in the shape of the work material due to the machining, and the tool path is optimized for the shape of the work material which changes as the machining progresses. The tool path can be generated efficiently, and the tool path can be efficiently generated.

Example 3. FIG. 8 is a block diagram showing the configuration of the main part of the numerical controller according to the third embodiment. In the figure, reference numeral 31 is a sweep shape generating means for generating a sweep shape of a cylinder having a radius of the same length as the offset length, based on the line for which the envelope is to be generated. Reference numeral 32 is a cross-section line generation unit that slices the sweep shape generated by the sweep shape generation unit 31 on a plane parallel to the plane defining the pocket shape to generate two cross-section lines. 33 is a section line generation means 3
Of the two cross-section lines generated by 2, the outer cross-section line is generated as an envelope curve if it is an outer envelope curve, and the inner cross-section line is generated as an envelope curve if it is an inner envelope curve. .

FIG. 9 is a flow chart showing the operation of the third embodiment. FIG. 10 is an explanatory diagram specifically showing the operation shown in the flowchart of FIG.
5 is a sweep shape when the tool shape 34 is moved, 36 is a plane parallel to the plane defining the pocket shape, and 39 and 40.
Shows two cross-section lines when the sweep shape 35 is sliced by a plane 36 parallel to the plane defining the pocket shape.

Next, the operation will be described. In FIG. 9, first, a line for which an envelope is to be generated is input (step ST31). Further, the offset length is input (step ST32), and then the cylinder 34 having the same radius as the offset length shown in FIG. 10A is generated (step ST33).

Next, based on the line input in step ST31, the sweep shape 35 is generated from the cylinder generated in step ST33 (step ST34). This state is shown in Figure 1.
It is shown in 0 (A). Then, the generated sweep shape 35
Is sliced by a plane 36 parallel to the plane defining the pocket shape to generate two sectional lines 39 and 40 (step ST35). This state is shown in FIG.

Then, of the two cross-section lines generated in step ST35, the outer cross-section line 39 is generated as the envelope curve for the outer envelope curve, and the inner cross-section line 40 is generated for the inner envelope curve. Generate as an envelope. This state is shown in FIG.
(C) of.

Therefore, according to this embodiment, since the envelope is generated from the two cross-section lines obtained by slicing the sweep shape of the tool, an accurate envelope can be generated.

Example 4. FIG. 11 is a block diagram showing the configuration of the main part of the numerical controller according to this embodiment. 11, parts that are the same as or equivalent to those in FIG. 1 are assigned the same reference numerals and explanations thereof are omitted. In the figure, reference numeral 41 indicates an envelope generated from the pocket outer shape by the inner envelope generating means 4 and the outer envelope generating means 6, and an island offset from the island shape in the pocket outer shape by the length of the tool radius. Determine whether or not the shape envelope will interfere,
In the case of causing interference, it is an interference avoidance envelope generating means for generating an envelope avoiding interference in consideration of the island shape.

FIG. 12 is a flow chart showing the operation of the fourth embodiment. Further, FIG. 13 is an explanatory diagram for specifically showing the characteristic operation of the flowchart shown in FIG. 12, and 45 indicates an island shape within the pocket outer shape 46.

Next, the operation will be described with reference to the flowchart of FIG. Note that, in FIG. 12, the same processing steps as those in FIG.

The operation of the numerical controller of this embodiment is based on the input island shape 45 and the machining information about the tool shape, and the island shape envelope offset from the island shape 45 to the outside by the length of the tool radius. Generate the line is (step ST
41). Next, it is determined whether or not the envelope a generated in step ST2 and the island-shaped envelope is generated in step ST41 interfere with each other (step ST42). When the envelope a and the island-shaped envelope is interfere with each other, the process proceeds to step ST43. On the other hand, if the envelope a and the island-shaped envelope is do not interfere with each other, the process proceeds to step ST3.

In step ST43, an envelope curve a'that avoids interference with the island shape 45 is generated, and the process proceeds to step ST3. In step ST3, if the envelope a and the island-shaped envelope is do not interfere with each other, the envelope a is used as the tool path, and if the envelope a and the island-shaped envelope is interfere with each other, the envelope a'is used as the tool path. . In the subsequent step ST4, the envelope curve b is generated by offsetting the envelope curve a or the envelope curve a ′ inward by the distance of the tool radius r.

Next, the envelope b generated in step ST4
Then, it is determined whether or not the envelope is generated in step ST41 interferes (step ST44). When the envelope b and the island-shaped envelope is interfere with each other, the process proceeds to step ST45. On the other hand, when the envelope b and the island-shaped envelope is do not interfere with each other, the process proceeds to step ST5. In step ST45, an envelope curve c'which avoids interference with the island shape 45 is generated, and in the subsequent step ST6, the envelope curve c'is used as a tool path. Further, in step ST5, an envelope c that is offset outward (in the pocket shape direction) by a predetermined distance from the envelope b is generated, and in the subsequent step ST6, the envelope c is used as a tool path.

Then, it is judged whether or not the next tool path needs to be generated (step ST7), and when it is not necessary, the processing is terminated. When it is necessary to generate the next tool path, the process returns to step ST4, and this time, the envelope c generated in step ST5 is inwardly offset by the distance of the tool radius r, and the process from step ST44 is performed. repeat.

Therefore, according to this embodiment, since the tool path that avoids the interference with the island shape is generated, the tool path that would process the island shape can be eliminated, and the pocket shape having the island shape can be eliminated. A tool path for machining can be accurately generated.

Example 5. FIG. 14 is a block diagram showing the configuration of the main part of the numerical controller according to the fifth embodiment. 14, parts that are the same as or correspond to those in FIGS. 1 and 11 are given the same reference numerals, and descriptions thereof will be omitted. 51 in the figure
When the envelopes generated by the inner envelope generating means 5 are two or more independent loops, only one of them is sent to the outer envelope generating means 6 and the remaining loops are stored. When the envelope generated by the re-inner envelope generating means 5 does not include the envelope offset by the length r of the tool radius, one of the stored envelopes of the other loops is changed to the outer envelope. Envelope storage means for sending to the generation means 6.

FIG. 15 is a flow chart showing the operation of the numerical controller according to the fifth embodiment, and FIG. 16 is an explanatory view specifically showing the operation according to the flow chart of FIG.
(D) shows the process of tool path generation.

Next, the operation will be described. Note that FIG.
2, the same processing steps shown in FIG. 2 and FIG. 12 are designated by the same reference numerals and the description thereof will be omitted. In the numerical controller of this embodiment, steps ST1 to ST43 are performed.
After performing the process up to the following flow chart,
It is determined whether the envelope curve a or the envelope curve a ′ generated in step ST4 is offset inward by the length of the tool radius r to generate an envelope curve b (step ST5).
1). As a result, when it is determined that the envelope is not generated, the process proceeds to step ST54, and when it is determined that the envelope is generated, the process proceeds to step ST52.

In step ST52, the envelope b is shown in FIG.
As shown in (C) of FIG.
2 ... b4) is determined. As a result, when it is determined that the loop does not have a plurality of loops, step ST4
4 is executed, and when it is determined that there are a plurality of loops, the process proceeds to step ST53.

In step ST53, step ST52
The plurality of loops determined by are stored. In the following step ST54, one is selected from the loops (b1, b2 ... b4) stored in the step ST53 and set as the envelope b1.

At the next step ST55, it is judged whether or not the inward envelope b can be generated with respect to the envelope b1, and if the envelope b can be generated, the processes from step ST44 are performed, and the envelope b When the envelope b for the line b1 cannot be generated any more, the process ends. Step ST
In the processing after 44, it is determined whether or not there is interference between the envelope b and the envelope is, and the envelope c or the envelope c ′ is generated according to the determination result (step ST5, step ST45).
After performing the process (step ST7) using the generated envelope c as the tool path, the process returns to step ST54.

At step ST54, this time at step S
Another loop is selected from the loops stored in T53 to form the envelope b2, and the processing from step ST55 is repeated.

Therefore, according to this embodiment, when there are a plurality of island shapes, it is possible to efficiently generate a tool path which avoids interference with the island shapes.

Example 6. FIG. 17 is a block diagram showing a main part of the numerical control device according to the sixth embodiment. 61 in the figure
Is a shape expressing means for expressing the shape of the work material and the tool shape. Reference numeral 62 is a tool movement command data input means for inputting tool movement command data, and 63 is a work material shape changing means for changing the shape of the work material from the data obtained from the shape representation means 61 and the tool movement command data input means 62. is there. 64
Is a recognition means for recognizing the position of the tool and the shape of the surrounding work material based on the data obtained from the work material shape changing means 63. Reference numeral 65 is a processing condition changing means for changing the processing condition based on the result recognized by the recognition means 64.

Next, the operation will be described. FIG. 18 is a flow chart showing the operation of the sixth embodiment. In the numerical controller of this embodiment, first, the tool shape data and the work material shape data are input from the shape representation means 61 (step S).
T61). Next, the tool movement command data is input from the tool movement command data input means 62 (step ST62).

Then, a tool sweep shape is further generated from the tool shape data and the tool movement command data (step S
T63). Next, the tool sweep shape is removed from the work material shape (step ST64).

Then, the tool shape is moved based on the tool movement command data, and the position of the tool is moved (step ST6).
5). Then, the shape of the work material around the position of the tool at this time is recognized (step ST66). Next, the processing conditions are changed based on the recognition result of the shape of the work material around the position of the tool in step ST66 (step ST6).
7).

Further, it is judged whether or not there is the next tool movement command data (step ST68). As a result, when there is the next tool movement command data, the process returns to step ST62, and when there is no next tool movement command data, the process ends.

Therefore, according to this embodiment, as a result of changing the working conditions according to the shape of the work material that changes due to working, for example, the work material is produced depending on the thickness and shape of the work material currently being worked. It is possible to optimize the processing conditions for performing highly accurate processing in consideration of distortion and the like.

Example 7. FIG. 19 is a block diagram showing the main configuration of the numerical controller according to the seventh embodiment. 19, parts that are the same as or equivalent to those in FIG. 17 are assigned the same reference numerals and explanations thereof are omitted. In the figure, 71 is a tool position recognizing means (recognizing means) for recognizing the position of the tool, 72 is a work material shape cutting means for cutting out the peripheral work material shape based on the tool position, and 73 is a work material shape cutting Cutout shape recognizing means (recognizing means) for recognizing the shape cut out by the means 72, and processing condition changing means 74 for changing the processing condition based on the result recognized by the cutout shape recognizing means 73.

FIG. 20 is a flow chart showing the operation of the numerical controller of this embodiment. FIG. 21 is an explanatory diagram concretely showing the operation according to the flowchart of FIG.
Is a tool, 77 is a work material, and 78 is a movement path of the tool 76.

Next, the operation will be described. Note that FIG.
In FIG. 18, the same processing steps as those shown in FIG. 18 are designated by the same reference numerals and the description thereof will be omitted. In this numerical controller, steps ST61 to ST6
After the processing of step 5 is performed, the work material shape 79 around the tool position shown in FIG. 21B is cut (step ST71), and then the cut work material shape 79 is recognized (step ST72). This state is shown in FIG. Then, the processing conditions are further changed based on the recognition result of the work material shape 79 in step ST72 (step ST73).

Therefore, according to this embodiment, the shape of the work material around the tool is cut out, and the shape of the work material that changes due to machining is recognized from the cut shape. The amount of data is reduced, and it becomes easy to change the machining conditions according to the shape of the work material that changes due to machining.

Example 8. FIG. 22 is a block diagram showing the main configuration of the numerical controller according to the eighth embodiment. 22, parts that are the same as or correspond to those in FIGS. 17 and 19 are given the same reference numerals and description thereof is omitted. 81 in the figure
Is a slice plane generating means for generating a plane to be sliced based on the position of the tool. Reference numeral 82 denotes a slice execution means for slicing the shape of the work material using the slicing plane to generate a cross-sectional shape. Reference numeral 83 is a cross-sectional shape recognition means (recognition means) for recognizing the cross-sectional shape generated by the slice execution means 82, and reference numeral 84 is a processing condition changing means for changing the processing condition based on the recognition result of the cross-sectional shape by the cross-sectional shape recognition means 83. .

FIG. 23 is a flow chart showing the operation of the numerical controller according to the eighth embodiment. 24 and 25 show
FIG. 24 is an explanatory view specifically showing the operation according to the flowchart in FIG. 23, and 80 a and 80 b show slice planes generated by the slice plane generation means 81 based on the position of the tool.

Next, the operation will be described. Note that FIG.
In FIG. 18, the same processing steps as those of FIG. 18 are designated by the same reference numerals and the description thereof will be omitted. In the numerical control device of this embodiment, steps ST61 to ST
After performing the processing up to 65, the work material 7 based on the position of the tool
A plane for slicing 7 is generated by the slice plane generating means 81 (step ST81). Next, the shape of the work material is sliced by the slice executing means 82 using the generated plane (step ST82). This state is shown in Figure 2.
4 shows.

Then, the cross-sectional shape of the work material obtained as a result of slicing is recognized (step ST83). This state is shown in FIGS. 25 (A) and 25 (B). Then, the processing conditions are changed based on the recognition result of the cross-sectional shape of the work material 77 in step ST83.

Therefore, according to this embodiment, it is possible to grasp the possibility of occurrence of bending or distortion of the work material 77 from the structural characteristics of the cross-sectional shape of the work material 77 centering on the working tool. As a result, it is possible to obtain optimum processing conditions according to the state of the cross-sectional shape of the work material 77 during processing, and it is possible to realize highly accurate processing.

Example 9. FIG. 26 is a block diagram showing the main parts of the numerical controller according to the ninth embodiment. In FIG. 26, portions that are the same as or correspond to those in FIGS. 17 and 19 are given the same reference numerals and description thereof is omitted. In the drawing, reference numeral 91 designates a vector from the position of the tool, and direction-specific information acquisition means for obtaining geometrical data and position data of the work material at the portion intersecting with the designated vector, and 92 designates when the vector is designated. A recognition means for recognizing the obtained geometric data and position data, and 93 is a processing condition changing means for changing the processing condition based on the recognition result of the geometric data and the position data recognized by the recognition means 92.

FIG. 27 is a flow chart showing the operation of the numerical controller of this embodiment. FIG. 28 is an explanatory diagram for specifically showing the operation according to the flowchart of FIG.

Next, the operation will be described. 27, the same processing steps as those in FIG. 18 are designated by the same reference numerals, and the description thereof will be omitted. In the numerical controller of this embodiment, after the processing from step ST61 to step ST65 is executed, a vector pointing from the center position of the tool 76 to the periphery of the work material is designated (step ST91). FIG. 28 shows this state, and 95a, 95b, and 95c are the designated vectors. Then, by obtaining the geometric data and the position data of the peripheral portion of the work material where the designated vector intersects the work material, the geometric data and the position data in the direction indicated by the designated vector from the position of the tool 76 can be obtained. The work material information is recognized (step ST92). Then step ST
The machining conditions are changed based on the work material information such as the geometric data and the position data recognized by 92 (step ST9).
3).

Therefore, according to this embodiment, it is possible to change the machining condition based on the geometric data and the position data of the peripheral portion of the work material obtained based on the vector specified in the arbitrary direction from the position of the tool. Therefore, it is possible to grasp the structural characteristics of the work material from the geometric data and position data of the work material peripheral part centered on the tool, and from that data, the bending and distortion of the work material can be generated. To know the possibility of
As a result, it is possible to obtain optimum processing conditions according to the structure such as the shape of the work material 77 being processed, and it is possible to realize highly accurate processing.

Example 10. FIG. 29 is a block diagram showing the main configuration of the numerical controller according to the tenth embodiment. FIG. 29
In FIG. 17, parts that are the same as or correspond to those in FIG. 17 and FIG. In the figure, 101 is a contact area recognition means (recognition means) for recognizing the contact area of the tool with respect to the work material, 102 is a contact position recognition means (recognition means) for recognizing the contact position of the tool with respect to the work material, Reference numeral 103 denotes a processing condition changing unit that changes the processing condition based on the contact area information recognized by the contact area recognition unit 101 and the contact position information recognized by the contact position recognition unit 102.

FIG. 30 is a flow chart showing the operation of the numerical controller of this embodiment. FIG. 31 is an explanatory diagram for specifically showing the operation according to the flowchart of FIG.

Next, the operation will be described. Note that FIG.
In FIG. 18, the same processing steps as those in FIG. 18 are designated by the same reference numerals and the description thereof will be omitted. In this numerical control device, after the processes of steps ST61 to ST65 are performed, the contact area of the tool with the work material is recognized (step ST101). This contact area is an area 107 in which the tool 76 and the work material 77 contact each other when the work material 77 is cut in the moving direction of the tool 76 as shown in FIG.
Is. Next, the contact position of the tool 76 with respect to the work material 77 is recognized (step ST102). Then, the contact area recognized in step ST101 and step ST1
The machining conditions are changed by changing the tool feed speed and the like based on the contact position recognized in 02 (step ST10).
3).

Therefore, according to this embodiment, when the cross-sectional shape of the work material by the plane including the tool path changes as the tool moves along the tool path, the contact area between the tool and the work material is changed. Since it also changes as the tool moves along the tool path, it is possible to change processing conditions such as the tool feed speed according to the changing contact area, while preventing bending and damage of the tool itself, and Optimal machining is realized according to the shape of the work material to be machined, and machining accuracy is also improved.

Example 11. FIG. 32 is a block diagram showing the main configuration of the numerical controller according to the eleventh embodiment. FIG.
In FIG. 17, parts that are the same as or correspond to those in FIG. 17 and FIG. In the figure, 111 is a thickness recognition means for recognizing the thickness of the work material at the tool position, 112 is a cutting amount calculation means for calculating the cutting amount,
Reference numeral 113 is a unit cutting amount calculation means for calculating a cutting amount per unit length with respect to the tool path, and 114 is a thickness recognition means 11
1 means for calculating the thickness of the work material and the unit cutting amount 1
The tool feed rate changing means changes the tool feed rate based on the cutting amount calculated in step 13.

FIG. 33 is a flow chart showing the operation of the numerical controller according to this embodiment. FIG. 34 is an explanatory diagram specifically showing the operation according to the flowchart of FIG.

Next, the operation will be described. In FIG. 33, the same processing steps as those of FIG. 18 are designated by the same reference numerals and the description thereof will be omitted. In the numerical controller according to this embodiment, steps ST61 to ST65.
After the processes up to are executed, the thickness of the work material left uncut from the position of the tool shown in 121 of FIG. 34 is recognized (step ST111). Then, depending on the thickness 121 of the work material from the position of the tool recognized in step ST111, the override value for the feed speed is increased when the work material is thick, and the feed speed is increased when the work material is thin. The override value for is reduced (step ST112).

Next, the cutting amount of the work material shown in 120 of FIG. 34 along the tool movement path 78 is calculated (step ST1).
13) Further, the cutting amount per unit length of the tool path is calculated from the cutting amount calculated in step ST113 and the length of the tool path (step ST114). And
When the cutting amount per unit length of the tool path calculated in step ST114 is large, the override value for the feed rate is lowered, and when the cutting amount per unit length for the tool path is small, the override value for the feed rate is set. Raise (step ST115). Further, the override value for the final feed rate is determined from the override value for the feed rate set in step ST112 and the override value for the feed rate set in step ST115 (step ST1).
16).

Therefore, according to this embodiment, the tool feed speed is changed based on the information about the cutting amount and the thickness of the non-cutting portion, which is obtained from the shape of the work material and the position of the tool, which change due to the machining. Thus, not only the machining load can be made constant, but also deterioration of machining accuracy due to a phenomenon such as escape of the work material caused by a change in the shape of the work material during the machining can be prevented.

Example 12. FIG. 35 is a block diagram showing the main configuration of the numerical controller according to the twelfth embodiment. FIG.
In FIG. 1, the same or corresponding parts as in FIG. In the figure, reference numeral 141 denotes a removal area setting means for setting a removal area to be shaved inside the pocket shape input by the shape input means 1. 1
Reference numeral 42 denotes a residual portion determining means for determining whether or not a residual portion that is left uncut remains in the removal area set by the removal area setting means 141. Reference numeral 143 is a shape correction unit that adds a correction shape for eliminating the residual portion determined to occur by the residual portion determination unit 132. 144 is shape correction means 14
Envelope generating means for generating an envelope with respect to the pocket shape modified by 3.

FIG. 36 is a flow chart showing the operation of the numerical controller according to this embodiment. Further, FIG. 37 is an explanatory diagram showing a state where an uncut portion is left in the pocket shape M1, FIG. 38 is an explanatory diagram showing an uncut portion that occurs when the pocket shape has an island shape, and FIG. 39 is a corrected shape. It is explanatory drawing when adding to a pocket shape.

Normally, when the pick feed and the tool radius coincide with each other when machining the pocket shape, the uncut portion can always be left in the acute angle portion as shown in FIG. Also,
As shown in FIG. 38, island shapes I1 and I2 are formed in the pocket shape.
Also exists, uncut portions R2 to R7 and the like occur. This is because there is a region where the tool cannot enter because the envelope is used as the tool path, and this becomes the uncut portion. Therefore, to prevent the area where the tool cannot enter, add a correction shape that allows the tool to enter the area where the tool cannot enter, and generate an envelope for the pocket shape to which this modification shape is added. Generate a trajectory.

Next, the operation of the numerical controller according to this embodiment will be described with reference to the flowchart of FIG. In this embodiment, the processing of the pocket shape will be described, but it goes without saying that the processing may be other than the pocket shape. In this numerical controller, first, the pocket shape input by the shape input means 1 and the processing information such as the tool shape and the pick feed input by the processing information input means 2 are read (step ST1). Next, a range to be cut with respect to the pocket shape is set as a removal area (step ST
202). Subsequently, it is determined whether or not there is an uncut portion in the set removal area (step ST203). As shown in FIG. 37, in an acute-angled corner portion, it is determined whether or not an uncut portion such as R1 occurs depending on the outer diameter of the tool and the angle of the corner portion. When it is determined that the uncut portion will occur, a predetermined corrected shape is added to the place where the uncut portion occurs (step ST204). In this case, when the predetermined correction shape to be added overlaps with the given machining shape, the tool path generated by the post-processing may destroy the shape. Therefore, in such a case, the correction shape is not added. . Further, the modified shape is based on the sweep shape of the tool used.

Next, as shown in FIG. 39, FIG. 40, and FIG. 41, an envelope curve is generated for the removal area to which the corrected shape S1 is added (step ST205), and the tool locus is further based on this generated envelope curve. Is generated (step ST206).
Then, the removal area is updated by moving the tool according to the tool trajectory and subtracting the sweep shape from the removal area (step ST207). Further, it is determined whether or not the removal area has disappeared (step ST208), and when the removal area still remains, the processing from step ST203 is repeated, and when the removal area does not remain, the processing ends. These shape processes are easily realized by using a solid model.

As described above, by modifying the removal area, it is possible to change the method of generating the envelope, and it is possible to generate a tool locus that is not left uncut in the removal area.

[0113]

As described above, according to the invention of claim 1,
Since the envelope curve that is offset by the length of the radius of the tool once is generated from the envelope curve that corresponds to the previous tool path, and the next tool path is generated based on that envelope curve, it is configured so that There is an effect that it is possible to generate an optimized tool path without waste according to a change in the shape of the cutting material.

According to the invention of claim 2, on the plane parallel to the plane defining the pocket shape, the swept shape of the tool shape is offset by a predetermined amount from the removed area,
Since it is configured to connect the envelopes generated by dividing into blocks to form the tool path, there is an effect that the tool path can be efficiently generated according to the change in the shape of the work material due to machining. .

According to the third aspect of the present invention, a sweep shape of a cylinder having a radius of the same length as the offset length is generated based on the line for which the envelope is to be generated, and the generated sweep shape is Since the slice is sliced on a plane parallel to the plane defining the pocket shape and the two cross-section lines of the sliced slice of the sweep shape are used as envelopes, an accurate envelope can be generated. effective.

According to the fourth aspect of the present invention, since the tool path is generated so as to avoid the interference with the island shape, it is possible to generate the tool path that does not interfere with the island shape for the pocket shape including the island shape. There is an effect that can be.

According to the fifth aspect of the present invention, when there is no envelope which is offset by the length of the inner tool radius generated by the inner envelope generating means or the re-inner envelope generating means, the envelope storing means disappears. Since it is configured to generate the envelope based on the other loop stored in
Even when the envelope has a plurality of independent loops, there is an effect that the envelope can be efficiently generated.

According to the invention of claim 6, the processing conditions are changed based on the recognition result of the shape of the work material and the position of the tool which change due to the processing. There is an effect that processing can be performed under processing conditions optimized according to the shape of the cutting material.

According to the invention of claim 7, the position of the tool is recognized, the recognized shape of the work material around the tool is cut, and the shape of the work material that changes according to the machining is cut based on the cut shape. Since it is configured to include a recognition unit that recognizes the cutting condition and a machining condition changing unit that changes the machining condition according to the shape of the work material around the tool recognized by the recognition unit, it is possible to change based on the cut shape. There is an effect that processing can be performed under processing conditions optimized according to the shape of the work material to be processed.

According to the invention of claim 8, the recognition of the shape of the work material and the position of the tool which change due to machining is performed by cutting the shape of the work material around the tool with a plane and based on the sectional shape. Since the recognizing means for performing and the machining condition changing means for changing the machining conditions according to the shape of the work material around the tool recognized by the recognizing means are provided, the cross section of the work material whose shape changes by the machining There is an effect that processing can be performed under processing conditions optimized according to the shape.

According to the ninth aspect of the invention, the recognition of the shape of the work material and the position of the tool, which change due to machining, is obtained by designating the vector in the arbitrary direction from the position of the tool. Recognition means based on data and position data,
Since the processing condition changing means for changing the processing conditions according to the shape of the work material around the tool recognized by the recognition means is provided, it is designated by the vector around the tool position whose shape is changed by the processing. Based on the geometric data and the position data of the work material, there is an effect that machining can be performed under the machining conditions optimized according to the shape of the work material around the tool.

According to the invention of claim 10, the recognition means for recognizing the contact area of the tool with respect to the work material and the contact position of the tool, and the shape of the work material around the tool recognized by the recognition means. Since the processing condition changing means for changing the processing conditions is provided, it is possible to perform the processing under the optimized processing conditions according to the shape of the work material around the tool based on the contact area and the contact position of the tool. There is an effect that can be done.

According to the eleventh aspect of the present invention, the tool feed speed changing means for changing the tool feed speed according to the recognized cutting amount and the thickness of the non-machined region of the work material is provided. Not only can the machining load be kept constant depending on the amount, but it is also possible to avoid phenomena such as the escape of the work material that occurs when the shape of the work material changes during machining and the thickness of the non-machining area changes. There is an effect that can be done.

According to the twelfth aspect of the invention, when it is determined that a residual portion will occur in the removed area, shape correcting means for performing correction by superimposing the corrected shape on the area determined to have the residual portion will be provided. With this configuration, there is an effect that it is possible to generate a tool path that does not cause a residual portion in the removal area.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a numerical controller according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the numerical control device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram specifically showing the operation of the numerical control device according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a main configuration of a numerical controller according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of the numerical control device according to the second embodiment of the present invention.

FIG. 6 is an explanatory diagram specifically showing the operation of the numerical control device according to the second embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a tool path generated by a numerical controller according to a second embodiment of the present invention.

FIG. 8 is a block diagram showing a main configuration of a numerical controller according to a third embodiment of the present invention.

FIG. 9 is a flowchart showing an operation of the numerical control device according to the third embodiment of the present invention.

FIG. 10 is an explanatory diagram specifically showing the operation of the numerical control device according to the third embodiment of the present invention.

FIG. 11 is a block diagram showing a main configuration of a numerical controller according to a fourth embodiment of the present invention.

FIG. 12 is a flowchart showing an operation of a numerical control device according to a fourth embodiment of the present invention.

FIG. 13 is an explanatory diagram showing a tool path generated by the numerical control device according to the fourth embodiment of the present invention.

FIG. 14 is a block diagram showing a main configuration of a numerical controller according to a fifth embodiment of the present invention.

FIG. 15 is a flowchart showing an operation of the numerical control device according to the fifth embodiment of the present invention.

FIG. 16 is an explanatory diagram for explaining the operation of the numerical control device according to the fifth embodiment of the present invention.

FIG. 17 is a block diagram showing a main configuration of a numerical controller according to a sixth embodiment of the present invention.

FIG. 18 is a flowchart showing an operation of the numerical control device according to the sixth embodiment of the present invention.

FIG. 19 is a block diagram showing a main configuration of a numerical control device according to a seventh embodiment of the present invention.

FIG. 20 is a flowchart showing the operation of the numerical control device according to the seventh embodiment of the present invention.

FIG. 21 is an explanatory diagram for explaining the operation of the numerical control device according to the seventh embodiment of the present invention.

FIG. 22 is a block diagram showing a main configuration of a numerical controller according to an eighth embodiment of the present invention.

FIG. 23 is a flowchart showing the operation of the numerical control device according to the eighth embodiment of the present invention.

FIG. 24 is an explanatory diagram for explaining the operation of the numerical control device according to the eighth embodiment of the present invention.

FIG. 25 is an explanatory diagram for explaining the operation of the numerical control device according to the eighth embodiment of the present invention.

FIG. 26 is a block diagram showing a main configuration of a numerical controller according to Embodiment 9 of the present invention.

FIG. 27 is a flowchart showing the operation of the numerical control device according to the ninth embodiment of the present invention.

FIG. 28 is an explanatory diagram for explaining the operation of the numerical control device according to the ninth embodiment of the present invention.

FIG. 29 is a block diagram showing a main configuration of a numerical controller according to a tenth embodiment of the present invention.

FIG. 30 is a flowchart showing an operation of the numerical control device according to the tenth embodiment of the present invention.

FIG. 31 is an explanatory diagram for explaining the operation of the numerical control device according to the tenth embodiment of the present invention.

FIG. 32 is a block diagram showing a main configuration of a numerical controller according to an eleventh embodiment of the present invention.

FIG. 33 is a flowchart showing the operation of the numerical control device according to the eleventh embodiment of the present invention.

FIG. 34 is an explanatory diagram for explaining the operation of the numerical control device according to the eleventh embodiment of the present invention.

FIG. 35 is a block diagram showing a main configuration of a numerical control device according to a twelfth embodiment of the present invention.

FIG. 36 is a flowchart showing the operation of the numerical control device according to the twelfth embodiment of the present invention.

FIG. 37 is an explanatory diagram for explaining an uncut area in a numerical controller according to a twelfth embodiment of the present invention.

FIG. 38 is an explanatory diagram for explaining the uncut area in the numerical control device according to the twelfth embodiment of the present invention.

FIG. 39 is an explanatory diagram for explaining a corrected shape in the numerical control device according to the twelfth embodiment of the present invention.

FIG. 40 is an explanatory diagram for explaining a corrected shape in the numerical control device according to the twelfth embodiment of the present invention.

FIG. 41 is an explanatory diagram for explaining a corrected shape in the numerical control device according to the twelfth embodiment of the present invention.

FIG. 42 is a flowchart showing a conventional numerical controller.

FIG. 43 is a block diagram showing a conventional numerical controller.

[Explanation of symbols]

1 shape input means, 2 processing information input means, 4, 23
Inner envelope generating means, 5 re-inner envelope generating means, 6
Outer envelope generation means, 7 input means, 8, 14, 46
Pocket outline shape, 9 tool paths, 11, 34, 76
Tool shape, 13, 35 Tool sweep shape, 21 Shape expressing means, 24, 31 Sweep shape generating means, 25 Sweep shape removing means, 26 Offset envelope generating means, 27 Envelope dividing means, 28 Tool path connecting means, 32 Cross section Line generation means, 33,144 Envelope generation means, 36 Plane parallel to the plane defining the pocket shape, 39,40 Cross section line, 41 Interference avoidance envelope generation means, 45, I1, I
2 island shape, 51 envelope storage means, 61 shape expression means, 62 tool movement command data input means, 63 work material shape changing means, 64, 92 recognition means, 65, 74, 8
4, 93, 103 machining condition changing means, 71 tool position recognizing means (recognizing means), 73 cut shape recognizing means (recognizing means), 77 work material shape, 83 cross-sectional shape recognizing means (recognizing means), 95a, 95b, 95c vector, 1
01 contact area recognition means (recognition means), 102 contact position recognition means (recognition means), 107 contact area, 111
Thickness recognition means, 113 Unit cutting amount calculation means, 114
Tool feed speed changing means, 121 Work material thickness, 141
Removal area setting means, 142 remaining portion determination means, 143 shape correction means, M1 pocket shape, S1 correction shape.

Claims (12)

[Claims] 1. Decoding the input numerical data, controlling each part based on the decoding result, operating a control target according to the input numerical data, and responding to the input numerical data In a numerical controller for machining a work material, a shape input means for inputting a pocket shape, a machining information input means for inputting machining information, and a tool radius length inward from the pocket shape input by the shape input means. An inner envelope generating means for generating a pocket-shaped inner envelope which is offset by a certain amount to be used as a tool path, and a pocket-shaped inner envelope generated by the inner envelope generating means is further inwardly offset by the length of the tool radius. A re-inner envelope generating unit that generates an envelope and an envelope that is offset from the envelope generated by the re-inner envelope generating unit to the outside by a predetermined amount are generated. And an input unit for generating an envelope in the re-inner envelope generating unit, the envelope being generated by the outer envelope generating unit, and the envelope generated by the outer envelope generating unit. Numerical control device. 2. The input numerical data is decoded, each part is controlled based on the decoding result, the controlled object is operated in accordance with the input numerical data, and in response to the input numerical data. In a numerical control device for processing a work material, a shape input means for inputting a pocket shape, a processing information input means for inputting processing information, a shape expression means for expressing a shape of a work material and a tool shape, Inner envelope generation means for generating a tool path by generating an envelope curve offset from the pocket outer shape input by the shape input means by the length of the tool radius, and a sweep shape when the tool is moved according to the tool path , A sweep shape removing means for removing the sweep shape from the work material shape, and a sweep shape removing means for removing the sweep shape on the plane parallel to the plane defining the pocket shape. Offset envelope generating means for generating an envelope that is offset by a predetermined amount from the region where the work material shape is removed, and the envelope is divided into blocks to form a tool path, and the tool path of the divided envelope A numerical value characterized by comprising: an envelope dividing means for making a tool path for generating the sweep shape in the sweep shape generating means; and a tool path connecting means for connecting the envelopes divided by the envelope dividing means. Control device. 3. The input numerical data is decoded, each part is controlled based on the decoding result, the controlled object is operated according to the input numerical data, and according to the input numerical data. Generates a swept shape of a cylinder having a radius of the same length as the offset length when generating the envelope based on the line for which the envelope is generated in the numerical control device that processes the work material And a cross-section line for slicing the sweep shape generated by the sweep-shape generating means on a plane parallel to the plane defining the pocket shape and generating two cross-section lines from the cross-section of the sweep shape. And a generating means, which generates an inner cross-section line of the two cross-section lines as an envelope curve when generating an inner envelope curve, and the two cross-section lines when generating an outer envelope curve. The cross-section line outside the , A numerical controller characterized by generating a tool path. 4. The island-shaped envelope, which is offset from the island shape in the pocket shape by the length of the tool radius, and the envelope generated by the inner envelope generating means or the outer envelope generating means interfere with each other. Determine whether to cause
The numerical controller according to claim 1 or 2, further comprising: interference avoidance envelope generating means for generating a new envelope that avoids the interference and using the envelope as a tool path when the interference occurs. 5. In the generation of an envelope which is offset by the length of the tool radius to the inside by the inner side envelope generation means, the outer envelope generation when the envelope has two or more loops. The envelope for storing the remaining loops excluding the loop for generating the envelope by the means, the envelope being offset by the length of the inward tool radius generated by the re-inner envelope generating means. The numerical controller according to claim 1 or 2, wherein when the line disappears, an envelope is generated based on another loop stored in the envelope storage means and used as a tool path. 6. Decoding the input numerical data, controlling each part based on the decoding result, operating a controlled object according to the input numerical data, and responding to the input numerical data In a numerical control device for machining a work material, a tool is moved inside the computer by performing a simulation based on the shape expression means for expressing the shape of the work material and the tool shape and the tool movement command data for moving the tool. And a work piece shape changing means for changing the shape of the work material, a recognition means for recognizing the position of the tool and the shape of the work material around the work material, and the machining condition is changed according to the recognition result by the recognition means. A numerical control device comprising a processing condition changing means. 7. The numerical controller according to claim 6, wherein the recognition unit recognizes the shape of the work material around the tool based on the shape of the work material cut out based on the recognized tool position. 8. The numerical value according to claim 6, wherein the recognition means recognizes the shape of the work material around the tool based on a cross-sectional shape when the shape of the work material around the tool is cut along a plane. Control device. 9. The recognizing means sets a vector from the position of the tool, and recognizes the shape of the work material around the tool based on the geometric data and the position data of the work material intersecting the set vector. 7. The numerical control device according to claim 6, wherein 10. The recognizing means recognizes a shape of a work material around the tool based on a contact area of the tool with the work material and a contact position of the tool with the work material. 6. The numerical controller according to 6. 11. A unit cutting amount calculating unit for calculating a cutting amount per unit length of a tool path based on a recognition result of a position of a tool and a shape of a work material around the unit by the recognizing unit, and the recognition. The machining condition changing means includes the thickness recognizing means for recognizing the thickness of the non-cutting portion of the work material based on the recognition result of the position of the tool by the means and the shape of the work material in the periphery. The feed rate is decreased when the cutting amount calculated by the cutting amount calculation means is large, the feed speed is increased when the cutting amount is small, and the feed speed is increased when the thickness recognized by the thickness recognition means is thick. The numerical control device according to claim 6 or 7, wherein the numerical control device is tool feed speed changing means for reducing the feed speed when the thickness is thin. 12. The input numerical data is decoded, each part is controlled based on the decoding result, and the controlled object is operated according to the input numerical data, and the control target corresponding to the input numerical data is operated. In a numerical controller for processing a work material, a removal area setting means for setting an area to be cut and removed from an inputted pocket shape, a removal area set by the removal area setting means, and a processing input by the processing information input means. In the pocket-shaped region in which the residual portion is determined based on the information, the residual portion determining unit determines whether or not the residual portion is generated, and the residual portion determined to be generated by the residual portion determining unit is formed.
A shape correction means for superposing correction shapes and correcting the pocket shape is provided, and an envelope curve is generated for the pocket shape corrected by the shape correction means to generate a tool path. Item 9. The numerical controller according to any one of items 5.