KR101864019B1 - Control System And Method of machine tool - Google Patents

Abstract

The present invention reduces the generation time of a program for processing J-grooves of a reactor head, automatically inputs macro data set in advance to the menu table, And more particularly, to a control system and method of a machine tool capable of reducing defects.
A method of controlling a machine tool according to an embodiment of the present invention includes steps of: implementing a menu for generating a control program by driving a smart cam and a visual CTK solution; Loading appropriate macro data and applying the loaded macro data to each item of the menu table; providing a plurality of menus through a menu table and providing an input window of a specific menu among the plurality of menu items, Determining whether a variable Mcl file exists in the drawing and providing a separate menu to generate an Mcl file of the drawing number if the variable Mcl file does not exist in the drawing; Generating a main program of the control program; and generating a sub-program of the control program.

Description

Technical Field [0001] The present invention relates to a control system for a machine tool,

The present invention relates to a control system for a machine tool, more specifically, to a method for reducing the time required for generating a program for processing J-grooves of a reactor head, To a control system and method of a machine tool capable of reducing defective machining of the grooves of a reactor head.

Korean Nuclear Power Plant is a Pressurized Water Reactor system with independent loops of primary and secondary to supply high temperature steam to turbine generators that produce electricity. To the steam generator to produce the steam. The primary system is contaminated with radioactivity to form an isolated loop and the secondary system uses the steam produced by the steam generator to rotate the turbine connected to the generator and return to the steam generator so that it does not directly contact the radioactivity.

The primary system consists of one reactor, two steam generators, one pressurizer, four main pumps, and a primary piping connecting these components. Here, in a nuclear power plant, a reactor provides a place where a chain reaction occurs by storing the fuel. The primary reactor coolant flows into the interior of the reactor vessel through the inlet nozzle of the reactor vessel and flows down between the reactor vessel inner wall and the reactor core of the core support structure. Then, through the flow baffle, I go over.

The first reactor coolant is heated while rising upward through the core while removing the heat generated from the fuel rod. After reaching the outlet region of the core, the heated coolant is circulated around the outside of the control rod protective tube, And moves toward the steam generator through a nozzle (Outlet Nozzle).

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a method of processing an upper lid and an upper lid of a reactor.

Referring to FIG. 1, a reactor 10 in a nuclear power plant includes a hemispherical head and a separable hemispherical reactor vessel 12 (Closure Head).

A plurality of control element drive mechanism (CEDM) nozzles and a vent line (not shown) are welded to the upper lid 12. J-shaped 'J-grooves' are formed at upper and lower portions where the control rod driving device nozzle and the upper lid 12 abut each other to fix the control rod driving device nozzle to the upper lid 12. [ Then, welding is performed on the formed J-groove to form a welded portion.

Here, the depth and the width dimension of the J groove to which the control rod driving device nozzle is welded are important factors in relation to whether the control rod driving device nozzle is firmly installed and the production cost. In addition, the J-grooves are formed in a hole shape to facilitate welding by using a POGO machine. Since the upper lid 12 has a hemispherical shape, the J-grooves are formed at positions formed with respect to a specific control rod driving device nozzle Accordingly, upper j-grooves and lower j-grooves can be distinguished.

In the prior art, when a control rod driving device nozzle of a nuclear reactor is installed, a standardized method for forming a J groove satisfying the standard specifications along the hemispherical top cover 12 is not established. Therefore, when the size of the upper lid 12 is changed, there is a problem that the processing amount and the welding amount for forming the J-groove increase and the manufacturing cost of the reactor increases.

Generally, it takes a long time to process the upper lid 12 by using the dedicated machine tool 20, and there is a problem that manufacturing quality is deteriorated because the machine tool is controlled by the inspection and experience of the worker.

Further, when changing the dimensions of the upper lid 12 and the J-groove, there is a problem that it takes a lot of time to generate a new program and a program. In addition, work is performed in a state in which the upper lid 12 is raised, work is performed in the front / rear of the upper lid 12 in a state where the actual work surface is not visible, it is necessary to move and fix the crane using a crane.

US Patent Application Publication No. 2012-0175352 A1 (Nozzle welding method, nozzle portion repair method, and nozzle welded structure)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control system and method of a machine tool capable of reducing a generation time of a program for machining J-grooves of a reactor head.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a control system and method of a machine tool capable of automatically reducing processing defects in the feed grooves of a reactor head, It is a technical task.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and it is a technical object of the present invention to provide a control system and a control method of a machine tool capable of ensuring work safety at the time of processing a reactor head.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to another aspect of the present invention, there is provided a method for controlling a machine tool, the method comprising: implementing a menu for generating a control program by driving a smart cam and a visual CTK solution; Loading macro data suitable for the type and size of the groove and applying the loaded macro data to each item of the menu table; providing a plurality of menus through the menu table; The method comprising: receiving a drawing number (No) by providing an input window; determining whether a variable Mcl file exists in the drawing; and if the Mcl file of the drawing does not exist, The method comprising the steps of: providing a menu; generating a main program of the control program; .

A method of controlling a machine tool according to an exemplary embodiment of the present invention is a method of controlling a machine tool in a step of implementing a menu for generating a control program, the method comprising the steps of: one of freeform machining, production milling, and advanced milling .

In the method of controlling a machine tool according to an embodiment of the present invention, the drawing number (No) is input through a closure head-nozzle data menu in the step of receiving the drawing number.

In the method of controlling a machine tool according to an embodiment of the present invention, in providing a separate menu for generating an Mcl file of the figure number, an excel GO = Provides a menu to select a variable setting.

In the method of controlling a machine tool according to an embodiment of the present invention, in the step of generating the main program and the sub-program, a drawing number input menu of the main groove menu is provided, and a point / Provide menus for sexuality.

The method of controlling a machine tool according to an embodiment of the present invention automatically inputs data of frequently used functions and variables using the macro data when generating the main program and the sub-program.

In the method of controlling a machine tool according to an embodiment of the present invention, an arc shape is divided into three parts and a half-circle arc processing method is applied to the arc groove of the J groove.

A method of controlling a machine tool according to an embodiment of the present invention is a method of recognizing a group exceeding a tool blade length at the time of machining of the groove and performing a semi-circle machining only by adding a two- Add a second-order program to the rest.

The method of controlling a machine tool according to an embodiment of the present invention is characterized in that, in the first machining, (1) machining is performed from the 3/4 th surface to the 4/4 th surface, (2) (3) performing the machining from the 3/4 to 4/4 plane, (4) performing the machining from the 2/4 plane to the 1/4 plane, and (5) / 4, and (6) the machining is performed in the 2/4 split to 1/4 split.

In the method of controlling a machine tool according to an embodiment of the present invention, in the second machining, the machining is performed from the 3/4 th surface to the 4/4 th surface, and the machining is performed from the 2/4 th surface to the 1/4 th surface.

A control system for a machine tool according to an embodiment of the present invention includes a menu table generation unit for generating a menu table for selection of a nozzle data menu, a menu selection unit for selecting a tool data suitable for each step and dimension of the J- A macro generating unit for generating, as macro data, a dimension to be applied to each of the types of the J-grooves and the respective machining stages; and a control unit for controlling the respective types of the J-grooves Accordingly, the control unit automatically applies the dimension data input to the data table to the menu table.

The control unit of the control system of the machine tool according to the embodiment of the present invention automatically loads the machining data into the menu table by loading predetermined macro data when the machining data is input to the menu table of the smart cam.

The control unit of the control system of the machine tool according to the embodiment of the present invention provides a menu for inputting the figure number of the main groove menu and provides a menu for setting the point / hole object for the nozzle hole position, And generates a main program and a sub program for control.

The control unit of the control system of the machine tool according to the embodiment of the present invention recognizes a group exceeding the tool blade length at the time of machining the groove and adds a two-step angular tool tool locus, After that, add a program to process the remainder.

The control system and method of the machine tool according to the embodiment of the present invention can reduce the generation time of the program for processing the J-grove of the reactor head.

The control system and method of the machine tool according to the embodiment of the present invention can automatically reduce the machining defects of the nozzle grooves of the reactor head by automatically inputting the machining data for the machining steps of the reactor head.

The control system and method of the machine tool according to the embodiment of the present invention can secure the safety in the machining work by processing the reactor head flow by controlling CNC (Computerized Numerical Control) lathe.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a method of processing an upper lid and an upper lid of a reactor.
2 is a diagram showing a control system of a machine tool.
Fig. 3 is a view showing a method for processing the jig groove of the upper lid.
Fig. 4 is a view showing a menu table to which processing data for the second grooving of the upper lid is inputted. Fig.
5 is a diagram illustrating a control method of a machine tool according to an embodiment of the present invention.
6 is a diagram showing an example of a program for machining a circular pattern divided into a first order and a second order.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being "below" other portions are described as being "above " other portions. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

A control system and method for a machine tool according to an embodiment of the present invention includes a CNC lathe (computer numerical control lathe) that executes a NC (Numerical Control) program stored in an internal storage device as a machine tool and processes the work Can be applied.

A control system and method of a machine tool according to an embodiment of the present invention is intended to enable easy and convenient input of machining data of a machining shape to be machined in a computer numerical control (CNC) machine tool. A control system and method for a machine tool according to an embodiment of the present invention provides a menu table for inputting machining data for machining of grooves of heads in a nuclear reactor, The machining data for a specific shape arbitrarily designated is generated and stored as macro data in advance. Thereafter, predefined macro data can be loaded and automatically entered into the menu table.

2 is a diagram showing a control system of a machine tool.

2, a control system 100 of a machine tool according to an embodiment of the present invention includes a control unit 110, an input unit 120, a display unit 130, a cam processing unit 140, a variable calculation unit 160, And a macro generating unit 170. The control system 100 of the machine tool according to the embodiment of the present invention further includes a measuring device for measuring the workpiece, and the measuring device automatically calculates the diameter of the workpiece by irradiating the laser beam onto the workpiece. Diameter data of the workpiece calculated by the measuring apparatus is input to the control unit 110. [

The control unit 110 transmits the menu table information input by the menu table generating unit 150 to the display unit 130 so that the menu table is displayed on the screen of the display unit 130. [ The display unit 130 may display an interactive screen for interfacing with an operator and the input unit 120 may be implemented through a touch screen provided in the display unit 130. [ However, the present invention is not limited thereto, and the input unit 120 may be implemented by including a separate input key as well as a touch screen.

 The variable calculating unit 160 calculates the machining value based on the source data input through the input unit 120 for machining the workpiece. The control unit 110 controls the cam processing unit 140 so that a tool according to the calculated machining value can be selected, automatically loads predetermined machining data, and controls the macro generating unit 170 to be applied to the menu table . Although not shown in the figure, the control unit 110 may include a processor, a ROM (Read Only Memory) for storing a program defining the order of processing by the processor, a program to be executed by receiving a proper numerical value input by the user, (Random Access Memory).

Fig. 3 is a view showing a method for processing the second grooves of the upper lid, and Fig. 4 is a view showing a menu table in which processing data for the second grooving of the upper lid is inputted.

3 and 4, although the shapes of the J grooves are the same, the dimensions to be applied to the respective steps may be different from each other. Since the dimensions are different in each processing step, it is necessary to be able to generate the machining data in a program so that various kinds of workpieces can be machined. To this end, the control system 100 of the machine tool according to the embodiment of the present invention provides a menu table for inputting machining data, and provides macro data for easy loading and use of repetitive machining data.

A control system (100) of a machine tool according to an embodiment of the present invention calculates an inclined surface angle of a workpiece and automatically selects a tool suitable for machining. As an example, arc processing is performed on the basis of the inclined surface angle calculated for the workpiece. At this time, use a ball endmill tool to divide the end surface of the hole from the end surface to the end surface of the straight portion in three. Then, the machine tool is controlled so as to finish the inclined part with an angular ball and well tool after machining into three equal tool traces.

As another example, a 2 Half-Circle arc machining method is applied along with the trisection, so that machining is performed from the bottom to the top. At this time, since the change / sphere shape, the inclination becomes larger toward the outer edge, resulting in a group exceeding the blade length of the tool. Here, the group in which the inclination exceeding the blade length of the tool is generated is recognized in advance, and the machining is performed in advance by adding the two-step angular portion tool locus. At this time, the machining program preparation step recognizes the group in which the inclination exceeding the blade length of the tool occurs, and adds the automatic programming.

A portion having a larger inclination at the time of the grooving process is generated. In the portion where the inclination exceeding the blade length of the tool occurs, the upper portion is subjected to the first machining, and then the lower portion is secondarily machined. As an example, a height value of an inclined portion is automatically calculated on the cam based on the calculated variable value, and a program is automatically generated so that machining is performed according to the calculated height value.

According to the height of the inclined portion, when the distance is 60 mm to 85 mm, 30 mm machining is performed. And when it is more than 85mm to 105mm or less, 40mm machining is performed. If it exceeds 105mm, it is moved by an automatic angle of 50mm, and only the semicircular part is processed first, and the program is generated so that the remaining semicircular parts are machined later.

Here, the menu table generation unit 150 generates a menu table and provides the menu table to the control unit 110. In the case of machining a round recessed sphere shape, the program can be created with the dimension data for nozzle hole / J_grv, so that the nozzle data menu is selected in the menu table (① in FIG. 4) to input data .

Also, when inputting the machining data into the menu table of the smart cam, the machining data is automatically inputted to the menu table by loading the preset macro data. The variable values of the machining data are automatically calculated by the variable calculating unit 160 and input into the menu table. At this time, variable calculation can use Excel.

The cam processing unit 140 selects tool data suitable for each step and dimension of the process of forming the groove and supplies the selected tool data to the control unit 110. [ The control unit 110 outputs a control signal based on the tool data so that a tool suitable for each machining step of the J groove to be machined is applied to the machine tool.

The macro generating unit 170 generates and stores the types of the J-groove and the dimensions applied to the respective machining stages as macro data, and provides macro data matching the machining request of the selected work to the controller 110. As shown in FIG. 4, the control unit 110 sets and stores a data table for processing the J-groove. Information of the menu table generated by the menu table generating unit 150 is inputted to the control unit 110 and the dimension data inputted to the data table according to each type of the J-groove to be processed by the control unit 110 is automatically .

5 is a diagram illustrating a control method of a machine tool according to an embodiment of the present invention.

Referring to FIG. 5 together with FIG. 4, the controller 110 drives the smart cam. At this time, one of freeform machining, production milling, and advanced milling may be applied (S10). At the same time, a visual CTK solution is driven (S20). Through this, a menu for creating a control program of the CNT lathe is implemented, and the macro is interlocked.

Specifically, the menu table generating unit 150 generates a menu table using a visual CTK tool. When the type and size of the second groove to be machined are set, the controller 110 loads macro data suitable for the type and dimension of the second groove to be machined to generate a control program for the CNC lathe. Then, a macro file is created through a smart cam. The control unit 110 automatically applies the loaded macro data to each item of the menu table.

Next, an input window is provided so that when a closure head-nozzle data menu is selected from among a plurality of menus provided through the menu table, an item of a drawing number (No) can be input. The drawing number can be inputted through the drawing number input window (S30).

Then, it is determined whether a variable Mcl file in the drawing set in S30 exists (S40).

If it is determined in step S40 that the variable Mcl file does not exist in the drawing, a separate menu is provided so that the Mcl file of the drawing number can be generated. Specifically, if the variable Mcl file does not exist in the drawing, it is possible to select an excel GO = variable in the nozzle data menu (S50).

Then, when the 'excel GO' = variable is selected, an excel window is opened and the item value can be changed through an open excel window. Thereafter, a "after change" menu is provided, and when the "after change" menu is selected, the text editor function is automatically performed (S60).

Next, a drawing number (No) input menu of the main groove main menu is provided. In addition, a menu is provided so that a point / hole object for the nozzle hole position can be formed. Thereafter, a "GO" menu is provided to allow the main program creation function to be performed automatically (S70).

On the other hand, if the variable Mcl file exists in the drawing of S40, the process of S70 is performed immediately.

Subsequently, a main program for controlling the machine tool is automatically generated (S80).

Specifically, a menu table is provided so that a main program (2 in FIG. 4) and a sub program (3 in FIG. 4) for J-groove processing can be generated. The main program can be generated by selecting the main program function in the menu table of Fig.

Then, in order to create a sub-program for machining the groove, a groove menu is provided. Then, a "GO" menu is provided so that the subprogram creation function can be automatically performed (S90).

Subsequently, a subprogram for controlling the machine tool is automatically generated (S100).

Specifically, a subprogram can be generated by selecting a subprogram function in the menu table of FIG. Here, data of functions and variables frequently used in generating the main program and the sub-program can be automatically input using macro data.

Fig. 6 is a view showing a method of detecting a portion exceeding the set inclination and dividing the pattern into a primary pattern and a secondary pattern to form a circular pattern.

Referring to FIG. 6, the control system 100 of the machine tool divides the arc shape into three halves and circular arc machining (3X2 = six equal halves) in circular arc machining of the J groove. At this time, machining is performed only from the bottom to the top of the arc.

(1) machining is performed from the 3/4 th surface to the 4/4 th surface, (2) the machining is performed from the 2/4 th surface to the 1/4 th surface, and (3) 3 (4) machining is carried out from the 2/4 th surface to the 1/4 th surface, (5) the machining is carried out from the 3/4 th surface to the 4/4 th surface, (6) Machining is performed in 2/4 split to 1/4 split.

Thereafter, in the case of secondary machining (using a ball stud tool), (1) machining is carried out from 3/4 to 4/4, and machining is carried out from 2/4 to 1/4.

 Because of the change / sphere shape, a group exceeding the blade length of the tool may occur because the inclination becomes larger toward the outer periphery. The group in which the inclination exceeding the blade length of the tool occurs is recognized in advance. The control system 100 of the machine tool allows the machining to be performed in advance by adding a two-step angular tool trajectory. At this time, the machining program preparation step recognizes the group in which the inclination exceeding the blade length of the tool occurs, and adds the automatic programming. If the slope is too large (over 50mm) during the machining process, a program is automatically added to the second machining of the remainder after machining only the semicircle of 50mm above.

The control system and method of the machine tool according to the embodiment of the present invention can reduce the generation time of the program for machining the J-grove of the reactor head. In addition, it is possible to automatically input the processing data for each processing step of the reactor head flow, thereby reducing the defective processing of the nozzle grooves in the reactor head flow. Further, the control system and method of the machine tool according to the embodiment of the present invention can secure the safety in the machining work by processing the reactor head flow by controlling CNC (Computerized Numerical Control) lathe.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: Machine tool control system
110:
120: Input unit
130:
140:
150: Menu table generating unit
160: Variable calculation unit
170:

Claims (14)

Implementing a menu for generating a control program by driving a smart cam and a visual CTK solution;
Loading macro data suitable for the type and size of the J-groove to be processed, and applying the loaded macro data to each item of the menu table;
Providing a plurality of menus through a menu table, receiving a drawing number (No) by providing an input window of a specific menu among the plurality of menu items,
Determining whether a variable Mcl file exists in the drawing, and providing a separate menu to generate an Mcl file of a drawing number if the variable Mcl file does not exist in the drawing;
Generating a main program of the control program; And
And generating a sub-program of the control program. The method according to claim 1,
In a step of implementing a menu for creation of a control program,
A method of controlling a machine tool applying one of freeform machining, production milling, and advanced milling. The method according to claim 1,
In the step of receiving the figure number,
Closure head - A method of controlling a machine tool that receives the drawing number (No) through a menu of nozzle data. The method according to claim 1,
Providing a separate menu for generating an Mcl file of the figure number,
When selected in the nozzle data menu, an excel window is opened and a menu for selecting the 'Excel GO = Variable Setting' tab is provided to allow the item value to be changed through an opened Excel window Method of controlling a machine tool. The method according to claim 1,
In the step of generating the main program and the sub-program,
A method of controlling a machine tool that provides a drawing number input menu of a J-groove main menu and provides a menu for defining a point / hole object for a nozzle hole position. 6. The method of claim 5,
And automatically inputting data of frequently used functions and variables by using the macro data when generating the main program and the sub-program. The method according to claim 1,
A method of controlling a machine tool by dividing an arc shape into three halves and applying a 2 Half-Circle arc machining method to the arc of the J groove. 8. The method of claim 7,
A group exceeding a tool blade length is recognized at the time of processing the J groove,
A method of controlling a machine tool that adds a program for two-step machining of a semi-circle of a first-order angle by adding a second-step angular tool trace, 9. The method of claim 8,
During the first machining,
(1) Machining is performed from 3/4 to 4/4,
(2) Machining is carried out from the 2/4 th surface to the 1/4 th surface,
(3) Machining is carried out from 3/4 to 4/4,
(4) Machining is performed in 2/4 quarters to 1/4 quarters,
(5) Machining is carried out from 3/4 to 4/4,
(6) A method of controlling a machine tool that performs machining from a 2/4 split to a 1/4 split. 10. The method of claim 9,
During secondary processing,
(1) Machining is carried out from 3/4 to 4/4,
(2) A method of controlling a machine tool that performs machining from a 2/4 split to a 1/4 split. A menu table generation unit for generating a menu table for selection of a nozzle data menu;
An input unit for inputting source data based on the menu table;
A variable calculating unit for calculating a dimension for machining the groove groove based on the source data;
A macro generating unit for generating macro data of the type of the J groove and the dimensions applied to each process stage;
A cam processing unit for selecting tool data suitable for each step and dimensions of the work groove of the J-groove; And
And a controller for automatically applying the dimension data stored in the macro data to the menu table according to each type of the J-groove,
Wherein,
A control system of a machine tool for generating a main program and a sub-program for controlling a machine tool by providing a drawing number input menu of a main groove menu and providing a menu for forming a point / hole object for a nozzle hole position. delete delete 12. The apparatus according to claim 11,
Control of the machine tool to recognize a group exceeding the cutting edge of the tool during the machining of the groove and to add a program for machining only the semicircle in the first step by adding the trajectory of the tool in the second step for the angle, system.

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