JP2018060501A - Machining system, cut product manufacturing method, cutting program correcting device, corrected cutting program creating method, and machine tool control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machining system capable of improving a cutting efficiency, a cut product manufacturing method, a cutting program correcting device, a corrected cutting program creating method, and a machine tool control device.SOLUTION: A machining system 1 includes, a cutting load chronological data collecting unit 21, a corrected cutting program creating unit 23, and a machine tool control device 10. The cutting load chronological data collecting unit 21 collects cut load chronological data when at least one workpiece W is cut in accordance with an original cutting program P1. Based on the cut load chronological data, the corrected cutting program creating unit 23 creates a corrected cutting program P2 by correcting the number of cutting paths C and by correcting feeding speeds of the cutting paths C.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a machining system, a method for manufacturing a machined product, a machining program correction device, a correction machining program creation method, and a machine tool control device.

  Conventionally, a method of cutting a workpiece (hereinafter referred to as “workpiece”) into a desired shape in accordance with a machining program has been widely used. In patent document 1, when processing a workpiece | work for the purpose of the efficiency improvement of a cutting process, an unevenness | corrugation is measured for every matrix-shaped processing block set on the surface of a workpiece | work, and every processing block according to the measured unevenness | corrugation A method for adjusting the feed rate has been proposed.

JP-A 63-237840

  However, in the method of Patent Document 1, since surface irregularities must be measured for each workpiece to be cut, there is a limit to improving the efficiency of cutting.

  The present invention has been made in view of the above-described situation, and a machining system capable of improving cutting efficiency, a manufacturing method of a machined product, a machining program correction device, a correction machining program creation method, and machine tool control. The purpose is to provide a device.

  A machining system according to the present invention is a machining system that cuts a workpiece with a cutting tool, and includes a machining load time data collection unit, a correction machining program creation unit, and a machine tool control device. The machining load aging data collection unit collects machining load aging data when cutting at least one workpiece according to the original machining program. The correction machining program creation unit corrects the correction machining program by correcting at least one of the number of machining paths of the cutting tool defined in the original machining program and the feed speed in the machining path based on the machining load aging data. create. The machine tool control device controls the operation of the cutting tool in accordance with the correction machining program.

  The method for manufacturing a machined product according to the present invention includes a step of collecting machining load time-lapse data when cutting at least one workpiece according to the original machining program, and the original machining program based on the machining load time-lapse data. By correcting at least one of the number of machining paths of the specified cutting tool and the feed speed in the machining path, a process of creating a correction machining program and controlling the operation of the cutting tool according to the correction machining program are performed. And a step of cutting the processed member.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing system and the manufacturing method of a cutting product which can improve the efficiency of cutting can be provided.

The block diagram which shows the structure of the machine system which concerns on embodiment Schematic showing the cutting conditions by the original machining program according to the embodiment Graph showing processing load aging data when the cutting tool is moved along the processing path shown in FIG. The schematic diagram which shows the cutting conditions by the correction processing program which concerns on embodiment The flowchart for demonstrating the cutting by the machine system which concerns on embodiment The block diagram which shows the structure of the machine system which concerns on other embodiment.

(Configuration of work system 1)
The configuration of the machine system 1 according to the present embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the work system 1. FIG. 2 is a schematic diagram showing cutting conditions of a workpiece (hereinafter referred to as “workpiece”) W defined by the original machining program P1. In FIG. 2, it is assumed that a workpiece that is a finished product is manufactured by cutting the workpiece W fixed to the table with a milling cutter. In the present embodiment, the Z axis is defined in the direction of the rotation axis of the tool spindle, the X axis is defined in the direction perpendicular to the Z axis, and the Y axis is defined in the direction perpendicular to the Z axis and the X axis.

  In the following description, “cutting feed” is a section in which a feed rate is set on the assumption that a workpiece is cut by a cutting tool. “Fast feed” is a section in which the feed speed is set on the assumption that the cutting tool does not contact the workpiece. Usually, the feed speed in the “fast feed” section is faster than the feed speed in the “cutting feed” section. The feed speed in the “rapid feed” section can be set to the maximum moving speed of the cutting tool. The “high feed” is a section of the “cutting feed” section that has been corrected so that the set feed speed is faster than a predetermined value. In this embodiment, as will be described later, it is assumed that the cutting tool and the workpiece do not contact in the “high feed” section. Accordingly, the “high feed” section is a section that is modified so that the feed rate is increased in the “cutting feed” section, and can be referred to as a “corrected fast feed” section.

  The machine system 1 includes a machine tool control device 10, a machining program correction unit 20, and a machine tool 30.

1. Machine tool control device 10
The machine tool control device 10 controls the machine tool 30. The machine tool control device 10 includes a storage unit 11, a machining path extraction unit 12, and a correction machining program execution unit 13.

  The storage unit 11 stores an original machining program P1 created for cutting the workpiece W from a predicted shape to a target shape. In the original machining program P1, cutting conditions for cutting the workpiece W from the expected shape to the target shape are defined. As the original processing program P1, for example, an NC (Numerical Control) program can be used, but is not limited thereto.

  The machining path extraction unit 12 extracts the machining path C defined in the original machining program P1 by analyzing the original machining program P1. The machining path C is a tool path (tool path) for moving the cutting tool 31 of the machine tool 30 in order to cut the workpiece W from the expected shape to the target shape. The machining path C is set at a position slightly shifted in the Z-axis direction. By repeatedly moving the cutting tool 31 along the processing path C, the workpiece W is gradually cut.

  In the original machining program P1 according to the present embodiment, as shown in FIG. 2, first to third machining passes C1 to C3 are defined in order to cut the workpiece W from a predicted shape to a target shape. The first machining path C1 is the first tool path of the cutting tool 31, and is located on the outermost side in the Z-axis direction. The second machining path C2 is the second tool path of the cutting tool 31, and is located between the first machining path C1 and the third machining path C3 in the Z-axis direction. The third machining path C3 is the third tool path of the cutting tool 31, and is located on the innermost side in the Z-axis direction. The third machining pass C3 corresponds to the target shape of the workpiece W. In the present embodiment, the first to third processing passes C1 to C3 may be collectively referred to as “processing pass C”.

  In the original machining program P1, XYZ coordinates and feed speeds of “cutting feed” and “rapid feed” are defined for each of the first to third machining passes C1 to C3. In the original machining program P1, as shown in FIG. 2, “first cutting feed”, “fast feed”, and “second cutting feed” are defined in each of the first to third machining passes C1 to C3. In the present embodiment, the XY coordinates of “first cutting feed”, “rapid feed”, and “second cutting feed” are the same and only the Z coordinate is different in each of the first to third machining passes C1 to C3. The XY coordinates of the “first cutting feed”, “rapid feed”, and “second cutting feed” may be different for each of the first to third machining passes C1 to C3. In the original machining program P1, the speeds of “cutting feed” and “rapid feed” are set. The feed rates of “first cutting feed” and “second cutting feed” are appropriately set according to the material of the cutting tool 31 and the workpiece W.

  The machining path extraction unit 12 processes the XYZ coordinates of “first cutting feed”, “fast feed”, and “second cutting feed” in the first to third machining paths C1 to C3 defined in the original machining program P1. It transmits to the program correction part 20.

  The modified machining program execution unit 13 acquires a modified machining program P2 described later from the machining program modifying unit 20. The correction machining program execution unit 13 controls the operation of the cutting tool 31 by outputting a command value (current value) to the machine tool 30 according to the correction machining program P2.

2. Machining program correction unit 20
The machining program correction unit 20 corrects the original machining program P1 based on the time-dependent data of the machining load when the workpiece W is cut according to the original machining program (hereinafter referred to as “machining load time-dependent data”). Create P2.

  The machining program modification unit 20 includes a machining load aging data collection unit 21, a comparison unit 22, and a modified machining program creation unit 23.

  The machining load aging data collection unit 21 collects machining load aging data when the workpiece W has been cut according to the original machining program P1 in the past from the machine tool 30. The machining load is the spindle load of the cutting tool 31, cutting torque of the cutting tool 31, load meter of the spindle motor 43, current value, voltage value and power value, load meter of the feed axis motor 44 of the cutting tool 31, current value, It is at least one of a voltage value and a power value.

  The machining load aging data collection unit 21 collects machining load aging data for at least one workpiece W. It is preferable that the machining load aging data collection unit 21 collects machining load aging data for as many workpieces W as possible over a long period of time.

  Here, FIGS. 3A to 3C are graphs showing machining load aging data when the cutting tool 31 moves through the first to third machining paths C1 to C3 shown in FIG. Since the cutting tool 31 does not come into contact with the workpiece W in “fast feed” and the machining load is not detected, only the machining loads in the “first cutting feed” and the “second cutting feed” are detected in FIGS. It is shown. 3A to 3C show values obtained by averaging the machining loads for a plurality of workpieces W that have been machined in the past for each date of the machining.

  FIG. 3A shows machining load aging data when the cutting tool 31 moves in the first machining path C1. In the “first cutting feed” and “second cutting feed” of the first machining path C1, the machining load is not detected because the cutting tool 31 does not contact the workpiece W as shown in FIG.

  FIG. 3B shows machining load aging data when the cutting tool 31 moves in the second machining path C2. In the “first cutting feed” and “second cutting feed” of the second machining path C2, the machining tool 31 is in contact with the workpiece W as shown in FIG. Before and after a section where 31 contacts the workpiece W (hereinafter referred to as “contact section”), there is a section where the cutting tool 31 does not contact the workpiece W (hereinafter referred to as “non-contact section”). In FIG.3 (b), the non-contact area is enclosed with the broken line.

  FIG. 3C shows machining load aging data when the cutting tool 31 moves in the third machining path C3. In the third machining pass C3 as well, the cutting tool 31 comes into contact with the workpiece W as shown in FIG. 2, so that the machining load is detected, but there are non-contact zones before and after the contact zone. In FIG.3 (c), the non-contact area is enclosed with the broken line.

  The comparison unit 22 uses the XYZ coordinates of the “first cutting feed” and the “second cutting feed” in the first to third machining paths C1 to C3 defined in the original machining program P1 as machining paths of the machine tool control device 10. Obtained from the extraction unit 12. The comparison unit 22 acquires machining load aging data for at least one workpiece W from the machining load aging data collection unit 21.

  The comparison unit 22 compares the XY coordinates of the “first cutting feed” and “second cutting feed” with the machining load time-lapse data, and the cutting tool 31 in the first to third machining passes C1 to C3 is the workpiece W. A machining path that does not contact the workpiece W (hereinafter referred to as “non-contact machining path”) and a machining path in which the cutting tool 31 contacts the workpiece W among the first to third machining paths C1 to C3 (hereinafter referred to as “contact machining path”). ) Is detected. In the example shown in FIGS. 3A to 3C, the first machining pass C1 is a non-contact machining pass, and the second and third machining passes C2 and C3 are contact machining passes. The comparison unit 22 notifies the correction machining program creation unit 23 of the non-contact machining path (first machining path C1) included in the first to third machining paths C1 to C3.

  The comparison unit 22 compares the XY coordinates of the “first cutting feed” and “second cutting feed” with the machining load time-lapse data, and the “first cutting feed” and “second cutting feed” in the contact machining path, respectively. Detect non-contact section at. In the example shown in FIGS. 3A to 3C, in each of the “first cutting feed” and the “second cutting feed” of the second and third machining passes C2 and C3, there is a non-contact section before and after the contact section. Exists. The comparison unit 22 notifies the correction machining program creation unit 23 of the XYZ coordinates indicating the non-contact section in each of the second and third machining paths C2 and C3.

  The modified machining program creation unit 23 acquires the original machining program P1 from the storage unit 11 of the machine tool control device 10.

  The modified machining program creation unit 23 acquires the non-contact machining path (first machining path C1) included in the first to third machining paths C1 to C3 from the comparison unit 22. The modified machining program creation unit 23 modifies the original machining program P1 so as to delete the first machining path C1 from the first to third machining paths C1 to C3 defined in the original machining program P1. As a result, the number of machining passes C is reduced from three to two.

  The correction machining program creation unit 23 acquires from the comparison unit 22 the XYZ coordinates indicating the non-contact section in the contact machining path (second and third machining paths C2 and C3). The correction machining program creation unit 23 corrects the original machining program P1 so that the feed speed in the non-contact section in the second machining pass C2 is increased, and also increases the feed speed in the non-contact section in the third machining path C3. The original machining program P1 is corrected.

  The correction machining program creating unit 23 creates the correction machining program P2 by deleting the non-contact machining path and increasing the feed speed in the non-contact section to the original machining program P1. FIG. 4 is a schematic diagram showing the cutting conditions of the workpiece W defined by the correction machining program P2. As shown in FIG. 4, in the correction machining program P2, the non-contact machining path (first machining path C1) is deleted and included in the contact machining paths (second and third machining paths C2, C3). The non-contact section is rewritten as “high feed” in “1 cutting feed” and “second cutting feed”. “High feed” means a section in which the cutting tool 31 is moved at a speed faster than the feed speed defined in the original machining program P1.

  The correction machining program creation unit 23 transmits the correction machining program P2 to the correction machining program execution unit 13 of the machine tool control device 10.

3. Machine tool 30
The machine tool 30 includes a cutting tool 31, a motor amplifier 32, a main shaft motor 33, and a feed shaft motor 34. The cutting tool 31 is, for example, a lathe, a milling cutter, a drill, a boring, and a tap, but is not limited thereto.

  The motor amplifier 32 drives the spindle motor 33 and the feed shaft motor 34 based on the command value input from the correction machining program execution unit 13. The main shaft motor 33 drives the main shaft of the cutting tool 31 to rotate. The feed shaft motor 34 drives the table feed shaft of the cutting tool 31. As illustrated in FIG. 4, the workpiece W is cut by moving the cutting tool 31 through the second and third machining paths C <b> 2 and C <b> 3 in which “high feed” is set.

(Cutting by machine system 1)
Next, cutting by the machine system 1 will be described. FIG. 5 is a flowchart for explaining cutting of the workpiece W by the machining system 1.

  In step S <b> 0, the machining program correction unit 20 collects machining load aging data when the workpiece W has been cut according to the original machining program P <b> 1 in the past from the machine tool 30.

  In step S <b> 1, the machine tool control apparatus 10 analyzes the original machining program P <b> 1 to extract a machining path C that repeatedly moves the cutting tool 31. In the present embodiment, as shown in FIG. 2, the first to third machining paths C1 to C3 are extracted.

  In step S <b> 2, the machining program correction unit 20 compares the machining load aging data for at least one workpiece W with the machining path C and determines whether a non-contact machining path exists. If there is no non-contact machining pass, the process proceeds to step S3. If a non-contact machining path exists, the machining program modification unit 20 modifies the original machining program P1 so as to delete the non-contact machining path from the machining path C in step S4.

  In step S <b> 3, the machining program correction unit 20 compares the machining load aging data for at least one workpiece W with the contact machining path, and determines whether a non-contact section exists in the “cutting feed” of the contact machining path. To do. If there is no non-contact section, the process proceeds to step S5. If there is a non-contact section, in step S6, the machining program modification unit 20 modifies the original machining program P1 so that the feed speed in the non-contact section is increased. By passing through at least one of step S4 and step S6, the original machining program P1 is modified to create a modified machining program P2.

  In step S5, the machine tool control apparatus 10 controls the operation of the cutting tool 31 by outputting a command value to the machine tool 30 according to the correction machining program P2. Thereby, the workpiece W is cut and a cut product is completed.

(Feature)
(1) The machine system 1 includes a machining load temporal data collection unit 21, a modified machining program creation unit 23, and a machine tool control device 10. The machining load aging data collection unit 21 collects machining load aging data when cutting at least one workpiece W according to the original machining program P1. The modified machining program creation unit 23 creates the modified machining program P2 by modifying the number of machining paths C and modifying the feed speed in the machining path C based on the machining load aging data.

  Therefore, the number of machining paths C and the feed speed of the cutting tool 31 for the workpiece W to be cut next are optimized by using the machining load time-lapse data when the machining is performed according to the original machining program P1 in the past. be able to. Therefore, compared with the case where the original machining program P1 is corrected for each workpiece W, the cutting conditions can be easily optimized, so that the cutting efficiency can be improved.

  (2) The modified machining program creation unit 23 modifies the original machining program P1 so as to delete the non-contact machining path in which the machining load is not detected in the machining path C. Therefore, since the number of machining paths C that actually move the cutting tool 31 can be reduced, the efficiency of the machining can be remarkably improved.

  (3) The correction machining program creation unit 23 has a high feed speed in the non-contact section in which the machining load is not detected among the “cutting feeds” included in the contact machining path in which the machining load is detected in the machining path C. The original machining program P1 is modified so that Therefore, since the feed rate in the contact machining pass can be finely adjusted, the cutting efficiency can be remarkably improved.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and various changes or modifications can be made without departing from the scope of the present invention.

  In the above embodiment, the comparison unit 22 determines the presence / absence of the non-contact machining pass and the contact machining pass, and the presence / absence of the non-contact zone and the contact zone based on whether or not the machining load is detected. These determinations may be made based on one threshold value.

  For example, a machining path in which the maximum machining load value of the machining path C is equal to or less than a first threshold is determined as a non-contact machining path, and a machining path in which the maximum machining load value of the machining path C exceeds the first threshold May be determined as a contact machining pass. Further, among “cutting feeds” included in the contact machining path, a section where the machining load is equal to or less than the second threshold is determined as a non-contact section, and a section where the machining load exceeds the second threshold is determined as a contact section. Good. The first threshold value and the second threshold value can be appropriately set in consideration of the cutting tool 31 and the material of the workpiece W. In the above embodiment, whether or not the machining load is detected is used as a reference, and therefore it can be considered that each of the first threshold value and the second threshold value is set to “0”.

  In the above embodiment, the correction machining program creation unit 23 corrects both the number of machining paths C and the feed speed in the machining path C, but only one of them may be corrected.

  In the above embodiment, the correction machining program creation unit 23 deletes the non-contact machining path from the machining path C, but does not delete the non-contact machining path and increases the feed speed in the non-contact machining path. Also good. Even in this case, the cutting efficiency can be improved as compared with the case of using the original machining program P1 as it is.

  In the machine system 1 according to the above-described embodiment, the machine tool control device 10 includes the machining path extraction unit 12. However, the machining path extraction unit 12 may be disposed outside the machine tool control device 10. However, it may be arranged in the machining program correction unit 20.

  For example, like the machine system 1a shown in FIG. 6, a machining program correction device 20a located physically away from the machine tool control device 10 includes a machining path extraction unit 12, a machining load temporal data collection unit 21, The comparison part 22 and the correction process program creation part 23 may be provided.

  The machine system 1a includes a machine tool control device 10, a machining program correction device 20a, a machine tool 30, a data acquisition unit 50, and a server 60.

  The data acquisition unit 50 is connected to the machine tool control device 10, the machine tool 30, and the server 60 via network communication. The data acquisition unit 50 acquires the original machining program P <b> 1 from the machine tool control device 10 and acquires machining load aging data from the machine tool 10. The data acquisition unit 50 transmits these pieces of information to the server 60. As the data acquisition unit 50, for example, a tablet computer can be used.

  The server 60 is connected to the machining program correction device 20a and the data acquisition unit 50 via network communication. The server 60 may be connected to the data acquisition unit 50 via a portable high-speed communication technology (LTE) line. The server 60 stores the information acquired from the data acquisition unit 50, and transmits the information acquired from the data acquisition unit 50 to the processing program correction device 20a in response to a request from the processing program correction device 20a.

  In the machining program correction device 20a, as described in the above embodiment, the machining path extraction unit 12 extracts the first to third machining paths C1 to C3 from the original machining program P1, and the comparison unit 31 calculates the machining load time-lapse data and The first to third machining paths C1 to C3 are acquired to detect the non-contact machining path and the non-contact section, and the modified machining program creation unit 32 generates the modified machining program P2. The correction machining program P2 generated in the machining program correction device 20a is input to the correction machining program execution unit 13 of the machine tool control device 10 via a storage medium (for example, a USB memory) or via network communication. Is done.

  Also in such a machining system 1a, the number of machining paths C for the workpiece W to be cut next and the feed of the cutting tool 31 are utilized by using the machining load time-lapse data when machining was performed according to the original machining program P1 in the past. Speed can be optimized.

DESCRIPTION OF SYMBOLS 1 Machine system 10 Machine tool control apparatus 11 Memory | storage part 12 Processing path extraction part 13 Correction processing program execution part 20 Processing program correction part 21 Processing load collection part 22 Comparison part 23 Correction processing program creation part 30 Machine tool 31 Cutting tool W Work P1 Original machining program P2 Modified machining program C1 First machining pass (non-contact machining pass)
C2 Second machining pass (contact machining pass)
C3 Third machining pass (contact machining pass)

Claims (8)

A machine system for cutting a workpiece by a cutting tool,
A machining load temporal data collection unit for collecting machining load temporal data when cutting at least one workpiece according to the original machining program;
A modification for creating a modified machining program by modifying at least one of the number of machining paths of the cutting tool defined in the original machining program and the feed speed in the machining path based on the machining load aging data. Machining program creation section,
A machine tool control device for controlling the operation of the cutting tool according to the correction machining program;
Work system equipped with. The modified machining program creation unit modifies the original machining program so as to delete a non-contact machining path in which the maximum value of the machining load is equal to or less than a first threshold among the machining paths.
The work system according to claim 1. The correction machining program creation unit is a non-contact in which the machining load is not more than the second threshold among cutting feeds included in the contact machining path in which the maximum value of the machining load is not less than the first threshold among the machining passes. Modify the original machining program so that the feed rate in the section is increased,
The work system according to claim 1. A process of collecting processing load aging data when cutting at least one workpiece according to the original processing program;
Creating a modified machining program by modifying at least one of the number of machining paths of the cutting tool defined in the original machining program and the feed speed in the machining path based on the machining load aging data; ,
Cutting the workpiece by controlling the operation of the cutting tool according to the correction processing program;
A method for manufacturing a machined product comprising: The number of machining paths of the cutting tool defined in the original machining program based on the machining load time-lapse data when the workpiece to be machined by the cutting tool is machined according to the original machining program, and the machining path A correction machining program creation unit for creating a correction machining program by correcting at least one of the feed speeds in
Machining program correction device. The machining load aging data and the machining path are acquired, and the cutting tool of the machining path is not in contact with the workpiece, and the cutting tool of the machining path is the workpiece. A comparison unit that detects at least one of non-contact sections in which the cutting tool does not contact the workpiece in a contact machining path that contacts the member;
The machining program correction device according to claim 5. The number of machining paths of the cutting tool defined in the original machining program based on the machining load time-lapse data when the workpiece to be machined by the cutting tool is machined according to the original machining program, and the machining path A correction machining program is created by correcting at least one of the feed speeds in
How to create a correction machining program. The number of machining paths of the cutting tool defined in the original machining program based on the machining load time-lapse data when the workpiece to be machined by the cutting tool is machined according to the original machining program, and the machining path The cutting tool is controlled using a correction machining program created by correcting at least one of the feed speeds in
Machine tool control device.

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