KR102507986B1 - Tool path changing device of cycle processing of machine tool - Google Patents

Abstract

The present invention reduces non-cutting time by changing the tool path of the machining program of the numerical control unit to perform cycle machining by selecting a non-cutting path section as the shortest path among the tool paths generated by the numerical control unit during cycle machining. Reduces the total machining time and automatically calculates the tool path so that the non-cutting path section among the tool paths becomes the shortest path during cycle machining in the numerical control unit that receives the machining program input through the HMI unit and forms the tool path, Compared to the conventional tool path, machining is performed with a tool path that shortens the total machining time, thereby improving the productivity of the machine tool and maximizing user satisfaction. Device and method for changing tool path during cycle machining of a machine tool It is about.

Description

Tool path changing device of cycle processing of machine tool}

The present invention relates to an apparatus and method for changing a tool path during cycle machining of a machine tool, and more particularly, to select a non-cutting path section among tool paths generated by a numerical control unit as the shortest path during cycle machining to perform cycle machining. A tool path changing device and method for changing a tool path during cycle machining of a machine tool capable of changing a tool path of a machining program of a numerical control unit to be performed.

In general, a machine tool refers to a machine used for the purpose of processing a metal/non-metal workpiece into a desired shape and dimension using an appropriate tool by various cutting processing methods or non-cutting processing methods.

Various types of machine tools, including turning centers, vertical/horizontal machining centers, door type machining centers, Swiss turns, electrical discharge machines, horizontal NC boring machines, and CNC lathes, are widely used in various industrial fields to suit the purpose of the work.

In general, various types of machine tools currently in use have a control panel to which numerical control (NC) or computerized numerical control (CNC) technology is applied. Such a control panel has various function switches or buttons and a monitor.

In addition, the machine tool has a table on which the material, which is a workpiece, is seated and transported for processing, a pallet for preparing the workpiece before processing, a spindle that rotates with a tool or workpiece combined, a tailstock for supporting the workpiece, etc. provide etc.

In general, in a machine tool, a table, a tool post, a main shaft, a tailstock, a resting ball, etc. are provided with a feed unit that feeds along a feed axis to perform various machining operations.

In addition, in general, machine tools use a plurality of tools for various processing, and a tool magazine or a turret is used as a tool storage area for storing and storing a plurality of tools.

Also, in general, a machine tool includes an automatic tool changer (ATC) for withdrawing or re-accommodating a specific tool from a tool magazine according to a command of a numerical controller to improve productivity of the machine tool.

In addition, in general, machine tools are provided with an automatic pallet changer (APC) to minimize non-processing time. An Automatic Pallet Changer (APC) automatically exchanges pallets between the workpiece processing area and the workpiece installation area. A workpiece may be mounted on the pallet.

In general, a tool path in a machine tool is created directly by an operator or through a method such as a CAM or an interactive system.

In the case of creating a tool path through an automated system such as CAM or interactive system, the user inputs the dimensions of the cutting part required for actual cutting, the cutting tool, the processing sequence, and the processing method. Additional parameters required to create a movement route for movement are input. At this time, the user inputs parameters considering not only the machining efficiency of the generated tool path, but also avoids collisions between the tool and the workpiece or between the tool and other components and considers machining stability, and the automation system creates the tool path based on the input parameters. .

In conventional machine tools, there are cases in which a numerical control unit (NC or CNC) can perform cycle machining. That is, it is possible to allow the user to create a cycle machining tool path.

Cycle processing refers to a function that enables processing by composing a certain pattern in a simple form.

In general, a single fixed cycle in a machine tool means machining the outer diameter and inner diameter of a workpiece and machining the end face. That is, the cycle type in the single fixed cycle can be divided into four types: an external turning cycle, an internal turning cycle, a thread cutting cycle, and a face turning cycle.

As such, a single fixed cycle forms one pattern with four STEPs, and the entire cycle is formed through repetition of this pattern.

As shown in FIGS. 1 and 2, the tool path during the external turning cycle or the internal turning cycle of a conventional machine tool is a plane second axis rapid traverse (STEP1), a plane first axis cutting feed (STEP2), and a plane second axis It consists of a pattern of cutting feed (STEP3) and flat 1st axis rapid feed (STEP4), and a cycle is formed through repetition of these patterns. Here, the rapid feed is the machining path (solid arrow), and the cutting feed is the non-cutting path (dotted arrow).

As shown in FIG. 3, the tool path during thread cutting cycle machining of a conventional machine tool is a plane 2 axis rapid feed (STEP1), a plane 1 axis cutting feed (STEP2), a corner cutting feed (STEP3), a plane 2 axis feed It consists of a pattern of rapid traverse (STEP4) and flat 1st axis rapid traverse (STEP5), and a cycle is formed through repetition of these patterns.

As shown in FIG. 4, the tool path for face turning cycle machining of a conventional machine tool is a plane 1st axis rapid feed (STEP1), a plane 2nd axis cutting feed (STEP2), a plane 1st axis cutting feed (STEP3), a plane It consists of a pattern of the second axis rapid traverse (STEP4), and a cycle is formed through repetition of this pattern.

As such, during cycle machining of a conventional machine tool, not only cannot shorten the machining path indicated by a solid line arrow, but also the machining path occupies a very small portion of the total machining time.

However, when the non-cutting path indicated by the dotted line arrow is changed to the shortest distance during cycle processing of the conventional machine tool, not only the non-cutting processing time is shortened, but also the overall processing time can be shortened, thereby maximizing the productivity of the machine tool.

Nonetheless, the conventional tool path changing device and method during cycle machining of a machine tool has a problem in that non-cutting time increases as cycle machining is not performed by selecting a non-cutting machining path as the shortest path during cycle machining. (Rapid traverse of STEP4 in FIGS. 1, 2, and 4, rapid traverse of STEP5 in FIG. 3)

In addition, the tool path change device and change method during cycle machining of a conventional machine tool have problems in that the overall machining time increases as the non-cutting time increases, reducing productivity and increasing machining cost.

Furthermore, the conventional tool path changing device and method during cycle processing of a machine tool cannot automatically select a non-cutting path section as the shortest path among tool paths during cycle processing, and the operator has to change it manually or through a program, which causes inconvenience to the operator. In the end, there was a problem that the overall machining time could not be reduced to a minimum because it took a lot of time to change the tool path.

Republic of Korea Patent Publication No. 10-2013-0116765

The present invention is to solve the above problems, and an object of the present invention is to perform cycle machining by selecting a non-cutting path section as the shortest path among tool paths generated by the numerical control unit during cycle machining. An object of the present invention is to provide a device and method for changing tool paths during cycle machining of a machine tool, which can reduce non-cutting time by changing the tool path of a program and finally reduce overall machining time.

In addition, another object of the present invention is to automatically calculate the tool path so that the non-cutting path section among the tool paths becomes the shortest path during cycle processing in a machining program input through the HMI unit and a numerical control unit that receives it and forms a tool path. And, by comparing this with the conventional tool path, machining is automatically performed with a tool path that shortens the total machining time, thereby improving the productivity of the machine tool, promoting operator convenience, and maximizing user satisfaction. It is to provide a tool path change device and change method during cycle machining.

In order to achieve the object of the present invention, a tool path changing device during cycle machining of a machine tool according to the present invention includes an HMI unit for inputting a machining program for machining a workpiece; a numerical control unit receiving the processing program input to the HMI unit and generating a tool path for processing a workpiece; a tool path control unit that changes a tool path of a machining program of the numerical control unit to perform cycle machining by selecting a non-cutting path section as the shortest path among tool paths generated by the numerical control unit during cycle machining; and a PLC for driving a driving unit according to a cycle machining tool path changed to a shortest path when cycle machining is performed through communication with the HMI unit, the numerical control unit, or the tool path control unit.

In addition, in another preferred embodiment of the tool path changing device during cycle machining of a machine tool according to the present invention, the tool path controller of the tool path changing device during cycle machining of a machine tool changes a non-cutting path section among tool paths to the shortest path. a memory unit for storing information to do; and an arithmetic unit configured to select a non-cutting path section as the shortest path among the tool paths generated by the numerical control unit through the information stored in the memory unit and calculate a tool path to perform cycle machining.

In addition, in another preferred embodiment of the tool path changing device during cycle machining of a machine tool according to the present invention, the memory unit of the tool path control unit of the tool path changing device during cycle machining of a machine tool determines the start coordinates of the tool and the tool during cycle machining. a location data storage unit that stores location data for end coordinates; a feed data storage unit for storing a feed axis, a feed direction, and a feed speed during cycle processing; A processing data storage unit for storing an X-axis cutting amount, a Z-axis cutting amount, and an X-axis escaping amount according to the type of cycle processing; and a repetition number data storage unit for storing the number of repetitions during cycle processing.

In addition, in another preferred embodiment of the tool path changing device during cycle machining of a machine tool according to the present invention, the calculation unit of the tool path control unit of the tool path changing device during cycle machining of a machine tool calculates the tool path generated by the numerical control unit and the a cycle presence determination unit for determining whether the machining program input to the HMI unit has a cycle function; Cycle processing type determination unit for determining the type of cycle processing; According to the information of the location data storage unit, the transfer data storage unit, the processing data storage unit, and the repetition count data storage unit and the type of cycle processing of the cycle processing type determination unit, the tool path is determined so that the non-cutting path section becomes the shortest path. a tool path calculation unit that calculates; a comparison unit for comparing entire non-cutting paths among the existing tool paths generated by the numerical control unit and the tool paths calculated through the tool path calculation unit; and a change unit for changing the existing tool path of the numerical control unit to the tool path calculated through the current tool path calculation unit when the total non-cutting path of the tool path calculated through the tool path calculation unit is reduced as a result of the determination of the comparison unit. can include

In order to achieve another object of the present invention, a method for changing a tool path during cycle machining of a machine tool according to the present invention includes the steps of inputting a machining program for machining a workpiece; receiving the input machining program and generating a tool path for processing the workpiece; Storing position data for the start coordinates of the tool and the end coordinates of the tool during cycle processing; Storing a feed axis, a feed direction, and a feed speed during cycle processing; Storing the X-axis cutting amount, Z-axis cutting amount, and X-axis escaping amount according to the type of cycle processing; Storing the number of iterations during cycle processing; Determining whether the tool path generated by the numerical control unit and the machining program input to the HMI unit have a cycle function; Determining the type of cycle processing; Calculating a tool path so that a non-cutting path section becomes the shortest path according to position data, transfer data, processing data, repetition count data, and type of cycle processing; comparing all non-cutting paths among existing tool paths generated by the numerical control unit and currently calculated tool paths; and changing the existing tool path of the numerical control unit to the current tool path when the non-cutting path of the currently calculated tool path decreases as a result of the comparison.

According to the present invention, an apparatus and a method for changing a tool path during cycle machining of a machine tool select a non-cutting path section as the shortest path among tool paths generated by the numerical control unit during cycle machining to perform cycle machining. It has the effect of reducing the non-cutting time by automatically changing the tool path of the program and ultimately shortening the overall machining time.

In addition, the tool path changing device and method during cycle processing of a machine tool according to the present invention is a machining program input through an HMI unit and a non-cutting path section among tool paths during cycle processing in a numerical control unit that receives the received program and forms a tool path. By automatically calculating a tool path to be the shortest path and performing machining with a tool path that reduces the total machining time compared to the conventional tool path, the productivity of the machine tool can be improved.

Furthermore, the device and method for changing tool paths during cycle processing of a machine tool according to the present invention promotes operator convenience and user satisfaction by automatically changing the tool path so that non-cutting path sections become the shortest path during cycle processing. There is an effect that can be maximized.

In addition, the tool path change device and method during cycle machining of a machine tool according to the present invention reduces the processing cost of the workpiece according to the reduction in processing time, improves the reliability and stability of the machine tool, and promotes export increase. It works.

1 shows a conceptual diagram of a tool path and a repetitive pattern during external turning cycle machining of a conventional machine tool.
2 shows a conceptual diagram of a tool path and a repetitive pattern during internal turning cycle machining of a conventional machine tool.
3 shows a conceptual diagram of a tool path and a repetitive pattern during thread cutting cycle machining of a conventional machine tool.
4 shows a conceptual diagram of a tool path and a repetitive pattern when machining a face turning cycle of a conventional machine tool.
5 shows a conceptual diagram of a tool path changing device during cycle machining of a machine tool according to an embodiment of the present invention.
6 shows a configuration diagram of a tool path changing device during cycle machining of a machine tool according to an embodiment of the present invention.
7 shows a conceptual diagram of a tool path and a repetitive pattern during external turning cycle machining of a machine tool according to the present invention.
8 shows a conceptual diagram of a tool path and a repetition pattern during internal turning cycle machining of a machine tool according to the present invention.
9 shows a conceptual diagram of a tool path and a repetitive pattern during thread cutting cycle machining of a machine tool according to the present invention.
10 shows a conceptual diagram of a tool path and a repetitive pattern when machining a face turning cycle of a machine tool according to the present invention.
11 shows a procedure diagram of a method of changing a tool path during cycle machining of a machine tool according to an embodiment of the present invention.

Hereinafter, it will be described in detail with reference to the drawings of the prefabricated pillow according to an embodiment of the present invention. The embodiments introduced below are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention may be embodied in other forms without being limited to the embodiments described below. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers indicate like elements throughout the specification.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and the common knowledge in the art to which the present invention belongs It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of explanation.

Terms used in this specification are for describing embodiments, and therefore are not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprise" and/or "comprising" means that a stated component, step, operation, and/or element is the presence of one or more other components, steps, operations, and/or elements. or do not rule out additions.

5 shows a conceptual diagram of a tool path changing device during cycle machining of a machine tool according to an embodiment of the present invention, and FIG. 6 is a block diagram of a tool path changing device during cycle machining of a machine tool according to an embodiment of the present invention. indicates 7 shows a conceptual diagram of a tool path and a repetitive pattern when processing an external turning cycle of a machine tool according to the present invention, and FIG. 8 shows a conceptual diagram of a tool path and a repetitive pattern when processing an internal turning cycle of a machine tool according to the present invention, 9 shows a conceptual diagram of a tool path and a repetitive pattern when machining a thread cutting cycle of a machine tool according to the present invention, and FIG. 10 shows a conceptual diagram of a tool path and a repeat pattern when machining a face turning cycle of a machine tool according to the present invention. 11 shows a procedure diagram of a method of changing a tool path during cycle machining of a machine tool according to an embodiment of the present invention.

Referring to FIGS. 5 to 10 , an apparatus 1 for changing a tool path during cycle machining of a machine tool according to an embodiment of the present invention will be described. As shown in FIGS. 5 and 6, the tool path changing device 1 during cycle machining of a machine tool according to an embodiment of the present invention includes an HMI unit 100, a numerical control unit 200, and a tool path control unit 300 and PLC 400.

The HMI unit 100 provides a user-machine linkage interface (Human-Machine Interface) for a worker to input a machining program for machining the workpiece 3. A worker inputs one or more workpiece machining programs using the HMI unit 100 .

The numerical control unit 200 receives the processing program input to the HMI unit 100 and generates a tool path for processing a workpiece. The numerical control unit 200 includes numerical control (NC) or computerized numerical control (CNC), and various numerical control programs are embedded therein. That is, the numerical control unit 200 has a driving program of a driving unit, an operation program of a tool, and the like, and the program is automatically loaded and operated according to the driving of the numerical control unit. The numerical control unit 200 communicates with the HMI unit 100, the tool path control unit 300, and the PLC 300 through a predetermined protocol.

In addition, although not shown in the drawing, according to a preferred embodiment of the present invention, the numerical control unit 200 includes a main operation unit, and this main operation unit includes a screen display program and a data input program according to screen display selection, , It displays the software switch on the display screen according to the output of the screen display program, recognizes the on/off of the software switch, and performs the function of issuing input/output commands for machine operation.

In addition, although not necessarily limited thereto, the main operation unit is installed on a housing, a case, or one side of the machine tool and includes various function switches or buttons and a monitor capable of displaying various types of information.

The tool path control unit 300 selects a non-cutting path section as the shortest path among the tool paths generated by the numerical control unit 200 during cycle machining and uses the tool path of the machining program of the numerical control unit 200 to perform cycle machining. change

PLC (400, Programmable Logic Controller) drives the driving unit according to the cycle machining tool path changed to the shortest path when cycle machining is performed through communication with the HMI unit 100, the numerical control unit 200, or the tool path control unit 300 do. The PLC 70 communicates with the numerical control unit 50 or the anti-collision control unit 60 according to a predetermined protocol, and performs a function of executing control commands through such communication. That is, the PLC 400 receives a control command according to a control program of the numerical controller 200 or the tool path controller 300 and operates. In addition, the PLC 400 may measure the number of revolutions and torque using the encoder of the drive unit. Accordingly, even for low-cost machine tools by the PLC 400, the tool path changing device can be easily installed and operated during cycle machining of the machine tool according to the present invention, thereby maximizing compatibility and minimizing installation costs. .

Therefore, the tool path changing device for cycle machining of a machine tool according to the present invention selects a non-cutting path section as the shortest path among the tool paths generated by the numerical control unit during cycle machining and performs cycle machining through a machining program of the numerical control unit. By automatically changing the tool path of the machine, non-cutting time can be reduced and finally the total machining time can be shortened.

In addition, although not shown in the drawing, the tool path changing device 1 during cycle machining of a machine tool according to an embodiment of the present invention may further include an input unit and a display unit.

The input unit is installed in the form of a switch or touch button on a control panel, etc., and selects the non-cutting path section as the shortest path among the tool paths generated by the numerical control unit during cycle machining to perform cycle machining. Executes the automatic selection change function.

That is, the input unit allows the operator to arbitrarily select the tool path automatic change function during cycle machining of the machine tool. If the automatic tool path change function during cycle processing of the machine tool is not selected in the input unit, the automatic tool path change function during cycle processing of the machine tool does not work.

The display unit displays values of the memory unit and calculation unit of the tool path control unit. Accordingly, the operator can check the real-time change of the tool path and the data stored in the memory unit during cycle machining with the naked eye.

In addition, the display unit displays an alarm when the current tool path calculated through the tool path calculation unit is determined to be the shortest path in the non-cutting section compared to the existing tool path generated in the numerical control unit as a result of the judgment of the comparison unit described later. It is possible to shorten the machining time of the machine tool, promote the convenience of the operator, and minimize the tool path change time according to the notification to the operator that the can be shortened. At this time, the alarm may be displayed in the form of a monitor, a warning sound, or a warning light.

Although not necessarily limited thereto, the display unit may be composed of an LCD, LED, PDP monitor, and the like.

5 and 6, the tool path control unit 300 of the tool path changing device 1 during cycle machining of a machine tool according to an embodiment of the present invention includes a memory unit 310 and an arithmetic unit 320. include

The memory unit 310 stores information for changing a non-cutting path section into a shortest path among tool paths.

The operation unit 320 selects a non-cutting path section as the shortest path among the tool paths generated by the numerical control unit 200 through information stored in the memory unit 310 and calculates the tool path to perform cycle machining. .

According to the present invention, the tool path changing device during cycle machining of a machine tool can reduce the machining cost of a workpiece according to the reduction in machining time, improve the reliability and stability of the machine tool, and increase exports.

As shown in FIG. 6, the tool path control unit 300 of the tool path changing device 1 during cycle machining of a machine tool according to an embodiment of the present invention includes a memory unit 310, a position data storage unit 311, It includes a transfer data storage unit 312, a processing data storage unit 313, and a repetition count data storage unit 314.

The positional data storage unit 311 stores positional data regarding the start coordinates (A) of the tool and the end coordinates (A') of the tool during cycle processing. The start coordinates (A) of the tool and the end coordinates (A') of the tool are different depending on the type of workpiece and the type of cycle processing. Although not limited thereto, the start coordinates (A) of the tool and the end coordinates (A') of the tool during cycle machining may be stored in the form of pre-input lookup data.

The feed data storage unit 312 stores feed axes, feed directions, and feed speeds during cycle processing. As for the feed speed, the rapid feed (R) speed and the cutting feed (F) speed are stored again. The feed axis, feed direction, and feed speed are different depending on the type of workpiece and the type of cycle processing. Although not necessarily limited thereto, the transfer axis, transfer direction, and transfer speed may be stored in the form of pre-input lookup data.

The processing data storage unit 313 stores the X-axis cutting amount (A), the Z-axis cutting amount (B), and the X-axis escape amount (C) according to the type of cycle processing. The X-axis cutting amount (A), Z-axis cutting amount (B), and X-axis ejection amount (C) are different depending on the type of workpiece and type of cycle processing. Although not necessarily limited thereto, the axis cutting amount (A), the Z-axis cutting amount (B), and the X-axis escaping amount (C) may be stored in the form of pre-input lookup data.

The repetition count data (K) stores the repetition count during cycle processing. The number of repetitions also differs depending on the type of workpiece and type of cycle processing. Although not necessarily limited thereto, the number of iterations K may be stored in the form of pre-input lookup data.

As shown in FIG. 6, during cycle machining of a machine tool according to an embodiment of the present invention, the calculation unit 320 of the tool path control unit 300 of the tool path changing device 1 includes a cycle existence determination unit 321, a cycle It includes a processing type determination unit 322, a tool path calculation unit 323, a comparison unit 324, and a change unit 325.

The cycle existence determination unit 321 determines whether the tool path generated by the numerical control unit 200 and the machining program input to the HMI unit 100 have a cycle function.

The cycle processing type determination unit 322 determines the type of cycle processing. Although not necessarily limited thereto, the type of cycle processing is divided into four types in a single type fixed cycle: an outer diameter turning cycle, an inner diameter turning cycle, a thread cutting cycle, and a face turning cycle.

The tool path calculation unit 323 includes the information of the position data storage unit 311, the transfer data storage unit 312, the processing data storage unit 313, and the repetition count data storage unit 314 and the cycle processing type determination unit ( According to the type of cycle machining in 322), the tool path is calculated so that the non-cutting path section becomes the shortest path. The tool path calculation unit 323 calculates in the same manner as in FIG. 7 when the cycle type is an external turning cycle. However, since the inner diameter turning cycle and the face turning cycle have similar cycle patterns to the outer diameter turning cycle, a detailed description thereof will be omitted below.

Referring to FIGS. 1 and 7, when the cycle type is an external turning cycle (including an internal turning cycle and a face turning cycle), the tool path calculation unit calculates the tool path so that the non-cutting path section becomes the shortest path. do.

As shown in FIG. 1, when the X-axis cutting amount is A, the Z-axis cutting amount is B, and the number of repetitions is 7, the tool path during cycle machining of a conventional machine tool is indicated by a dotted line arrow in FIG. 1 where the cycle type is an external turning cycle. The total non-cutting path, denoted by , is:

Finally, the entire non-cutting path during conventional external turning cycle machining is calculated by Equation 1 below.

[Equation 1]

Total non-cutting path = 3KA - 2A + KB

As shown in FIG. 7, when the X-axis cutting amount is A, the Z-axis cutting amount is B, and the number of repetitions is 7, the tool path during cycle machining of the machine tool according to the present invention is shown in FIG. 7 in which the cycle type is an external turning cycle The total non-cutting path indicated by the dotted arrow in is:

Finally, the entire non-cutting path during the external turning cycle machining according to the present invention is calculated by Equation 2 below.

[Equation 2]

Total non-cutting path =

The tool path calculation unit 323 calculates in the same manner as in FIG. 9 when the cycle type is a thread cutting cycle.

Referring to FIGS. 3 and 9 , a process of calculating a tool path so that a non-cutting path section becomes the shortest path in a tool path calculation unit when the cycle type is a thread cutting cycle will be described below.

As shown in FIG. 3, when the X-axis cutting amount is A, the Z-axis cutting amount is B, the X-axis escaping amount is C, and the number of repetitions is 7, the tool path during cycle machining of a conventional machine tool is a thread cutting cycle. The total non-cutting path indicated by the dotted line arrow in FIG. 3 is as follows.

Finally, the entire non-cutting path during conventional external turning cycle machining is calculated by Equation 3 below.

[Equation 3]

Total non-cutting path = 3KA - 2A +KB +KC

As shown in FIG. 9, when the X-axis cutting amount is A, the Z-axis cutting amount is B, the X-axis escaping amount is C, and the number of repetitions is 7, the tool path during cycle machining of the machine tool according to the present invention has a cycle type The total non-cutting path indicated by the dotted line arrow in FIG. 9, which is a thread cutting cycle, is as follows.

Finally, the entire non-cutting path during the external turning cycle machining according to the present invention is calculated by Equation 4 below.

[Equation 4]

Full non-cutting path

The comparator 324 compares all non-cutting paths among the existing tool paths created by the numerical control unit 200 and the tool paths calculated by the tool path calculation unit 323.

In the external turning cycle, the total non-cutting path length among the tool paths calculated by selecting the entire non-cutting path among the existing tool paths according to Equation 1 and the non-cutting path section according to the present invention according to Equation 2 as the shortest path The comparison is shown in Table 1 below.

That is, when the cycle type is an external turning cycle, the X-axis cutting amount is 2, the Z-axis cutting amount is 5, and the number of repetitions is from 1 to 10, comparing the non-cutting path to the shortest path before and after the change, the table below As can be seen from 1, the path reduction rate is changed to 17-20%, except for the case where the number of iterations is 1.

In the thread cutting cycle, the total non-cutting path length among the tool paths calculated by selecting the entire non-cutting path among the existing tool paths by Equation 3 and the non-cutting path section according to the present invention according to Equation 4 as the shortest path Comparison is shown in Table 2 below.

That is, when the cycle type is a thread cutting cycle, the X-axis cutting amount is 2, the Z-axis cutting amount is 5, the X-axis escaping amount is 0, and the number of repetitions is from 1 to 10, the same as before changing the non-cutting path to the shortest path When compared after the change, as can be seen from Table 2 below, the path reduction rate is changed to 17 to 20%, except for the case where the number of iterations is 1.

In the thread cutting cycle, the total non-cutting path length among the tool paths calculated by selecting the entire non-cutting path among the existing tool paths by Equation 3 and the non-cutting path section according to the present invention according to Equation 4 as the shortest path The comparison is shown in Table 3 below.

That is, when the cycle type is a thread cutting cycle, the X-axis cutting amount is 2, the Z-axis cutting amount is 5, the X-axis escaping amount is 0.5, and the number of repetitions is from 1 to 10, the same as before changing the non-cutting path to the shortest path When compared after the change, as can be seen from Table 2 below, the path reduction rate is changed to 6 to 24%, except for the case where the number of iterations is 1.

In the thread cutting cycle, the total non-cutting path length among the tool paths calculated by selecting the entire non-cutting path among the existing tool paths by Equation 3 and the non-cutting path section according to the present invention according to Equation 4 as the shortest path Comparison is shown in Table 4 below.

That is, when the cycle type is a thread cutting cycle, the X-axis cutting amount is 2, the Z-axis cutting amount is 5, the X-axis escaping amount is 1, and the number of repetitions is from 1 to 10, the same as before changing the non-cutting path to the shortest path When compared after the change, as can be seen in Table 2 below, the path reduction rate is changed to 11 to 27%, except for the case where the number of iterations is 1.

In the thread cutting cycle, the total non-cutting path length among the tool paths calculated by selecting the entire non-cutting path among the existing tool paths by Equation 3 and the non-cutting path section according to the present invention according to Equation 4 as the shortest path The comparison is shown in Table 5 below.

That is, when the cycle type is a thread cutting cycle, the X-axis cutting amount is 2, the Z-axis cutting amount is 5, the X-axis escaping amount is 1.5, and the number of repetitions is from 1 to 10, the same as before changing the non-cutting path to the shortest path When compared after the change, as can be seen from Table 2 below, the path reduction rate is changed to 15 to 30%, except for the case where the number of iterations is 1.

As such, it can be seen from Tables 1 to 5 that when the X-axis escape amount is 0 in the thread cutting cycle, the path reduction rate of the external turning cycle is similar.

In addition, it can be seen from Table 6 below that the path reduction rate increases as the X-axis escape amount increases when the number of repetitions, the X-axis cutting amount, and the Z-axis cutting amount are the same.

In a manner similar to Tables 1 to 6, the comparison unit compares all non-cutting paths, that is, path reduction rates among the existing tool paths generated by the numerical control unit and the new tool paths calculated through the tool path calculation unit. However, Tables 1 to 6 change and compare the tool paths of the machining programs of the numerical control unit to perform cycle machining by selecting non-cutting path sections as the shortest path among the tool paths generated by the numerical control unit during cycle machining of the present invention. It is intended to explain the method, but is not limited thereto.

The change unit 325 converts the existing tool path of the numerical control unit 200 to the current tool path calculation unit when the total non-cutting path of the tool path calculated through the tool path calculation unit 324 is reduced as a result of the judgment of the comparison unit. Change to toolpath.

Therefore, in the tool path changing device for cycle machining of a machine tool according to the present invention, a machining program input through the HMI unit and a numerical control unit that receives the received program and forms a tool path have the shortest path among the non-cutting path sections during cycle machining. The productivity of the machine tool is improved by automatically calculating the tool path to be, and performing machining with the tool path that shortens the total machining time by comparing it with the conventional tool path. By changing the tool path automatically as much as possible, it is possible to promote the convenience of the operator and maximize the user's satisfaction.

Referring to FIG. 11, a method of changing a tool path during cycle machining of a machine tool according to an embodiment of the present invention will be described. As shown in FIG. 11, a method for changing a tool path during cycle machining of a machine tool according to an embodiment of the present invention includes inputting a machining program (S1), generating a tool path (S2), storing position data (S3), Transfer data storage step (S4), processing data storage step (S5), repetition count data storage step (S6), cycle function determination step (S7), cycle type determination step (S8), tool path calculation step (S9), Comparing the entire non-cutting path among the existing tool path and the current tool path (S10), and changing the tool path (S11). The calculation and comparison principles of the tool path calculation unit 323 and the comparison unit 324 have been described in detail above, and the same will be described below with emphasis on each step.

One or more workpiece processing programs are input using the HMI unit 100 to process a workpiece.

After the machining program input step (S1), the machining program input from the numerical control unit 200 is received and a tool path is created to process the workpiece.

After the tool path generation step (S2), position data for the start coordinates (A) of the tool and the end coordinates (A') of the tool are stored in the position data storage unit 311 during cycle machining.

After the position data storage step (S3), the feed axis, feed direction, and feed speed during cycle processing are stored in the feed data storage unit 312. Feed rate is stored again as rapid feed (R) speed and cutting feed (F) speed.

After the transfer data storage step (S4), the X-axis cutting amount, Z-axis cutting amount, and X-axis escaping amount according to the type of cycle processing are stored in the processing data storage unit 313.

After the processing data storage step (S5), the number of repetitions during cycle processing is stored in the repetition number data storage unit 314.

After the repetition count data storage step (S6), the cycle existence determination unit 321 determines whether the tool path generated by the numerical control unit 200 and the machining program input to the HMI unit 100 have a cycle function.

After the cycle function determination step (S7), the type of cycle processing is determined. Although not necessarily limited thereto, the type of cycle processing is divided into four types in a single type fixed cycle: an outer diameter turning cycle, an inner diameter turning cycle, a thread cutting cycle, and a face turning cycle.

After the cycle type determination step (S8), the tool path calculation unit 323 calculates the tool path so that the non-cutting path section becomes the shortest path according to the position data, transfer data, processing data, repetition count data, and type of cycle processing in the tool path calculation unit 323. do. This calculation principle has been described in detail above, and the same will be omitted below.

After the tool path calculation step (S9), the comparison unit 324 compares the existing tool path generated in the numerical control unit with all non-cutting paths among the currently calculated tool paths. This comparison principle has been described in detail above, and the same will be omitted below.

After the comparison step (S10), when the non-cutting path of the currently calculated tool path decreases (the same when the non-cutting path reduction rate increases) as a result of the comparison, the existing tool path of the numerical control unit 200 is changed to the current tool path.

Therefore, during machining, the tool path of the machining program of the numerical control unit is automatically changed to select the non-cutting path section as the shortest path among the tool paths generated by the numerical control unit to perform cycle machining, thereby reducing the non-cutting time and finally It is possible to shorten the entire processing time, promote user convenience by automatically changing it, and improve productivity of the machine tool.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those having ordinary knowledge in the art will find the scope of the present invention described in the claims to be described later. It will be understood that various modifications and changes can be made to the present invention without departing from the spirit and technical scope. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: tool path changing device, 2: tool,
3: workpiece, 100: HMI unit,
200: numerical control unit, 300: tool path control unit,
310: memory unit, 311: location data storage unit,
312: transfer data storage unit, 313: processing data storage unit,
314: repetition count data storage unit, 320: calculation unit,
321: cycle existence determination unit, 322: cycle processing type determination unit,
323: tool path calculation unit, 324: comparison unit,
325: change unit, 400: PLC,
A: start coordinates, X-axis infeed amount, A': end coordinates,
B: Z-axis infeed amount, C: X-axis escape amount,
K: number of repetitions, R: rapid traverse,
F: cutting feed.

Claims (5)

HMI unit for inputting a machining program for machining a workpiece;
a numerical control unit receiving the processing program input to the HMI unit and generating a tool path for processing a workpiece;
a tool path control unit that changes a tool path of a machining program of the numerical control unit to perform cycle machining by selecting a non-cutting path section as the shortest path among tool paths generated by the numerical control unit during cycle machining; and
A PLC driving a drive unit according to a cycle processing tool path changed to the shortest path when cycle processing is performed through communication with the HMI unit, the numerical control unit, or the tool path control unit;
The tool path control unit,
a memory unit for storing information for changing a non-cutting path section among tool paths to a shortest path; and
An arithmetic unit for selecting a non-cutting path section as the shortest path among tool paths generated by the numerical control unit through the information stored in the memory unit and calculating a tool path to perform cycle machining;
the memory unit,
a position data storage unit for storing position data about the start coordinates of the tool and the end coordinates of the tool during cycle processing;
a feed data storage unit for storing a feed axis, a feed direction, and a feed speed during cycle processing;
A processing data storage unit for storing an X-axis cutting amount, a Z-axis cutting amount, and an X-axis escaping amount according to the type of cycle processing; and
It includes; repeat count data storage unit for storing the number of iterations during cycle processing;
The calculation unit,
a cycle determination unit for determining whether the tool path generated by the numerical control unit and the processing program input to the HMI unit have a cycle function;
Cycle processing type determination unit for determining the type of cycle processing;
According to the information of the location data storage unit, the transfer data storage unit, the processing data storage unit, and the repetition count data storage unit and the cycle processing type of the cycle processing type determination unit, the tool path is determined so that the non-cutting path section becomes the shortest path. a tool path calculation unit that calculates;
a comparison unit for comparing entire non-cutting paths among the existing tool paths generated by the numerical control unit and the tool paths calculated through the tool path calculation unit; and
and a change unit for changing the existing tool path of the numerical control unit to the tool path calculated through the current tool path calculation unit when the total non-cutting path of the tool path calculated through the tool path calculation unit is reduced as a result of the determination of the comparison unit. A tool path changing device during cycle processing of a machine tool, characterized in that for doing.
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