JP6865058B2 - Machine tool system, manufacturing method of machined products, machining program correction device, correction machining program creation method, and machine tool control device - Google Patents

Description

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

Conventionally, a method of cutting a member to be machined (hereinafter referred to as "work") into a desired shape according to a machining program has been widely used. In Patent Document 1, when machining a work, unevenness is measured for each matrix-shaped machining block set on the surface of the work for the purpose of improving the efficiency of cutting, and each machining block is measured according to the measured unevenness. A method of adjusting the feed rate has been proposed.

Japanese Unexamined Patent Publication No. 63-237840

However, in the method of Patent Document 1, since the feed rate can be adjusted only for each machining block set on the surface of the work, there is a limit in improving the efficiency of cutting.

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

The machine tool system according to the present invention is a machine tool system for cutting a member to be machined with a cutting tool, and includes a shape measuring unit, a processing program correction unit, and a machine tool control device. The shape measuring unit generates actual shape data indicating the actual shape of the member to be processed. The machining program correction unit creates a correction machining program by correcting at least one of the number of machining passes of the cutting tool specified in the original machining program and the feed rate in the machining pass based on the actual shape data. .. The machine tool control device controls the operation of the cutting tool according to the correction machining program.

The method for manufacturing a machined product according to the present invention includes a step of generating actual shape data indicating the actual shape of the member to be machined and the number of machining paths of the cutting tool specified in the original machining program based on the actual shape data. , And a step of creating a correction machining program by modifying at least one of the feed rates in the machining path, and a step of cutting the member to be machined by controlling the operation of the cutting tool according to the modification machining program. ..

According to the present invention, it is possible to provide a machining system capable of improving the efficiency of cutting and a method for manufacturing a machined product.

Block diagram showing the configuration of the work system according to the embodiment Schematic diagram showing cutting conditions by the original machining program according to the embodiment Schematic diagram showing cutting conditions by the correction machining program according to the embodiment Flow chart for explaining cutting by the work system according to the embodiment Block diagram showing the configuration of the work system according to another embodiment

(Configuration of work system 1)
The configuration of the work system 1 according to the present embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a work system 1. FIG. 2 is a schematic view showing cutting conditions according to the original machining program P1. FIG. 3 is a schematic view showing cutting conditions by the correction machining program P2. In FIGS. 2 and 3, a finished machined product can be manufactured by cutting with a lathe while rotating a member to be machined (hereinafter referred to as “work”) W around a center of rotation AX. It is supposed. In the present embodiment, the X-axis is defined in the direction of the rotation center AX, and the Z-axis is defined in the direction perpendicular to the X-axis.

In the following description, the "cutting feed" is a section in which the feed rate is set on the assumption that the workpiece is cut by a cutting tool. "Fast-forward" is a section in which the feed rate is set on the assumption that the cutting tool does not come into contact with the workpiece. Usually, the feed rate in the "fast forward" section is faster than the feed rate in the "cutting feed" section. The feed rate in the "fast forward" section can be set to the maximum moving speed of the cutting tool. Further, the "high feed" is a section of the "cutting feed" section modified so that the set feed rate becomes faster than the default value. In this embodiment, as will be described later, it is assumed that the cutting tool and the work do not come into contact with each other in the "high feed" section. Therefore, the "high feed" section can be referred to as a "corrected fast forward" section because it is a section of the "cutting feed" section modified so that the feed rate is increased.

The machine tool system 1 includes a machine tool control device 10, a shape measuring unit 20, a machining program correction unit 30, and a machine tool 40.

1. 1. Machine tool control device 10
The machine tool control device 10 controls the machine tool 40. The machine tool control device 10 has a storage unit 11, a machining path extraction unit 12, and a correction machining program execution unit 13.

The storage unit 11 stores the original processing program P1 created for cutting the work W from the expected shape to the target shape. The target shape of the work W is the shape of the machined product. As shown in FIG. 2, the original machining program P1 defines the predicted shape of the work W, the target shape of the work W, and the cutting conditions for cutting the work W from the predicted shape to the target shape. .. As the raw processing program P1, for example, an NC (Numerical Control) program can be used, but the raw processing program P1 is not limited to this.

The processing path extraction unit 12 extracts the processing path C defined in the original processing program P1 by analyzing the original processing program P1. The machining path C is a tool path (tool locus) for moving the cutting tool 41 of the machine tool 40 in order to cut the work W from the expected shape to the target shape. The machining path C is set at a position slightly deviated in the Z-axis direction. By repeatedly moving the cutting tool 41 along the machining path C, the work W is gradually machined in the Z-axis direction.

In the original machining program P1 according to the present embodiment, as shown in FIG. 2, the first to third machining paths C1 to C3 are defined in order to cut the work W from the expected shape to the target shape. The first machining path C1 is the first tool pass of the cutting tool 41 and is located on the outermost side in the Z-axis direction. The second machining pass C2 is the second tool pass of the cutting tool 41 and is located between the first machining pass C1 and the third machining pass C3 in the Z-axis direction. The third machining path C3 is the third tool pass of the cutting tool 41 and is located on the innermost side in the Z-axis direction. The third machining path C3 corresponds to the target shape of the work W. In the following description, the first to third machining paths C1 to C3 may be collectively referred to as "machining paths C".

Further, in the original machining program P1, the coordinates of "cutting feed" and "fast forward" and the feed speeds of "cutting feed" and "fast forward" are defined for each of the first to third machining passes C1 to C3. There is. In the original machining program P1, as shown in FIG. 2, the X coordinates of "cutting feed" and "fast feed" in each of the first to third machining passes C1 to C3 are the same, but only the Z coordinate is different. The X coordinates of "cutting feed" and "fast feed" may be different for each of the first to third machining passes C1 to C3. In the original processing program P1, the feed rate of "cutting feed" is constant, and the feed rate of "fast forward" is constant. The feed rate of the "cutting feed" is appropriately set according to the materials of the cutting tool 41 and the work W.

The machining path extraction unit 12 transmits the coordinates and feed rate of "cutting feed" and "fast forward" in each of the first to third machining passes C1 to C3 defined in the original machining program P1 to the machining program correction unit 30. To do.

The correction machining program execution unit 13 acquires the correction machining program P2, which will be described later, from the machining program correction unit 30. The correction machining program execution unit 13 controls the operation of the cutting tool 41 by outputting a command value (current value) to the machine tool 40 according to the correction machining program P2.

2. Shape measuring unit 20
The shape measuring unit 20 measures the actual shape (hereinafter, referred to as “actual shape”) of the work W in the unprocessed state. The shape measuring unit 20 detects the uneven shape on the outer surface of the work W. A 2D camera and a 3D camera can be used as the shape measuring unit 20, but the shape measuring unit 20 is not limited to this.

The shape measuring unit 20 generates actual shape data indicating the actual shape of the work W. The shape measuring unit 20 transmits the actual shape data to the machining program correction unit 30.

3. 3. Machining program correction unit 30
The machining program correction unit 30 creates the correction machining program P2 by modifying the original machining program P1 based on the actual shape data of the work W. The machining program correction unit 30 has a comparison unit 31 and a correction machining program creation unit 32.

The comparison unit 31 sets the coordinates and feed rate of the “cutting feed” and “fast forward” in the first to third machining paths C1 to C3 defined in the original machining program P1 to the machining path extraction unit of the machine tool control device 10. Obtain from 12. The comparison unit 31 acquires the actual shape data of the work W from the shape measurement unit 20.

As shown in FIG. 3, the comparison unit 31 compares the actual shape of the work W indicated by the actual shape data with the first to third machining paths C1 to C3 defined in the original machining program P1. A machining path in which the cutting tool 41 does not come into contact with the work W (hereinafter referred to as "non-contact machining path") among the first to third machining paths C1 to C3, and a cutting tool among the first to third machining paths C1 to C3. The machining path in which 41 comes into contact with the work W (hereinafter referred to as "contact machining path") is detected. In the example shown in FIG. 3, 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 31 notifies the correction processing program creation unit 32 of the non-contact processing path (first processing path C1) included in the first to third processing paths C1 to C3.

As shown in FIG. 3, the comparison unit 31 includes the actual shape of the work W indicated by the actual shape data and the contact processing paths (second and third processing paths C2 and C3) specified in the original processing program P1. Is compared to detect a section (hereinafter, referred to as “non-contact section”) in which the cutting tool 41 does not come into contact with the work W in the “cutting feed” in the contact machining path. As can be seen by comparing FIGS. 2 and 3, all three “cutting feeds” included in the second machining path C2 include non-contact sections, and the three “cutting feeds” of the third machining path C3 Two of these "cutting feeds" include non-contact sections. The comparison unit 31 notifies the correction processing program creation unit 32 of the non-contact sections in each of the second and third processing paths C2 and C3.

The correction machining program creation unit 32 acquires the original machining program P1 from the storage unit 11 of the machine tool control device 10.

The correction machining program creation unit 32 acquires the non-contact machining path included in the machining path C from the comparison unit 31. The correction machining program creation unit 32 modifies the original machining program P1 so as to delete the non-contact machining path from the machining path C defined in the original machining program P1. In the example shown in FIG. 3, the first machining path C1 is deleted from the first to third machining passes C1 to C3 defined in the original machining program P1. As a result, the correction machining program P2 in which the number of machining paths C is reduced from three to two is created.

The correction machining program creation unit 32 acquires the non-contact section included in the “cutting feed” of the contact machining path in the machining path C from the comparison unit 31. The correction machining program creation unit 32 modifies the original machining program P1 so that the feed rate of the non-contact section included in the “cutting feed” of the contact machining path becomes high. In the example shown in FIG. 3, the original machining program P1 is modified so that the feed rate of the non-contact section included in the three "cutting feeds" of the second machining path C2 is increased, and the two of the third machining paths C3 are modified. The original machining program P1 is modified so that the feed rate of the non-contact section included in the “cutting feed” is increased. As a result, the correction machining program P2 in which the feed rate in the machining path C is increased is created. In FIG. 3, the non-contact section in which the feed rate is increased is described as "high feed".

The correction machining program creation unit 32 transmits the correction machining program P2 in which the number of machining passes C and the feed rate in the machining path C are modified to the correction machining program execution unit 13 of the machine tool control device 10.

4. Machine tool 40
The machine tool 40 includes a cutting tool 41, a motor amplifier 42, a spindle motor 43, and a feed shaft motor 44. The cutting tool 41 is, for example, a lathe, a milling cutter, a drill, a boring, a tap, and the like. In FIGS. 2 and 3, it is assumed that the cutting tool 41 is a lathe, but the cutting tool 41 is not limited to this.

The motor amplifier 42 drives the spindle motor 43 and the feed shaft motor 44 based on the command value input from the correction processing program execution unit 13. The spindle motor 43 rotates and drives the spindle of the cutting tool 41. The feed shaft motor 44 drives the table feed shaft of the cutting tool 41. As shown in FIG. 3, the work W is cut by moving the cutting tool 41 along the second and third machining paths C2 and C3 in which the "high-speed cutting feed" is set.

(Cutting by work system 1)
Next, the cutting process by the work system 1 will be described. FIG. 4 is a flowchart for explaining the cutting process of the work W by the work system 1.

In step S1, the machine tool control device 10 extracts a machining path C for repeatedly moving the cutting tool 41 by analyzing the original machining program P1. In this embodiment, as shown in FIG. 2, the first to third processing paths C1 to C3 are extracted.

In step S2, the shape measuring unit 20 generates actual shape data indicating the actual shape of the work W.

In step S3, the machining program correction unit 30 compares the actual shape of the work W with the machining path C to determine whether or not a non-contact machining path exists. If there is no non-contact machining path, the process proceeds to step S4. When a non-contact machining path exists, in step S5, the machining program correction unit 30 modifies the original machining program P1 so as to delete the non-contact machining path from the machining path C.

In step S4, the machining program correction unit 30 compares the actual shape of the work W with the contact machining path, and determines whether or not there is a non-contact section in the cutting feed of the contact machining path. If there is no non-contact section, the process proceeds to step S6. When there is a non-contact section, in step S7, the machining program correction unit 30 modifies the original machining program P1 so that the feed rate in the non-contact section becomes high. By going through at least one of step S5 and step S7, the original machining program P1 is modified and the modified machining program P2 is created.

In step S6, the machine tool control device 10 controls the operation of the cutting tool 41 by outputting a command value to the machine tool 40 according to the correction machining program P2. As a result, the work W is machined to complete the machined product.

(Features)
(1) The machine tool system 1 includes a shape measuring unit 20, a machining program correction unit 30, and a machine tool control device 10. The shape measuring unit 20 generates actual shape data indicating the actual shape of the work W. The machining program correction unit 30 corrects the number of machining passes C specified in the original machining program P1 and corrects the feed rate in the machining pass C specified in the original machining program P1 based on the actual shape data. Creates a correction machining program P2. The machine tool control device 10 controls the operation of the cutting tool 41 according to the correction machining program P2.

Therefore, since the number of machining paths C and the feed rate of the cutting tool 41 can be optimized for each work W, the cutting process can be shortened as compared with the case where the original machining program P1 is used as it is. As a result, the efficiency of cutting can be improved.

(2) The machining program correction unit 30 modifies the original machining program P1 so as to delete the non-contact machining path in which the cutting tool 41 does not come into contact with the work W in the machining path C. Therefore, since the number of machining paths C for actually moving the cutting tool 41 can be reduced, the efficiency of cutting can be remarkably improved.

(3) The machining program correction unit 30 is in a non-contact section in which the cutting tool 41 does not come into contact with the work W in the "cutting feed" included in the contact machining path in which the cutting tool 41 contacts the work W in the machining path C. The original machining program P1 is modified so that the feed rate becomes high. Therefore, since the feed rate in the contact processing path can be finely adjusted, the efficiency of cutting processing can be remarkably improved.

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

In the above embodiment, the machining program correction unit 30 corrects both the number of machining passes C and the feed rate in the machining pass C, but only one of them may be modified.

In the above embodiment, the machining program correction unit 30 decides to delete the non-contact machining path in the machining path C, but even if the non-contact machining path is not deleted and the feed rate in the non-contact machining path is increased. Good. Even in this case, the efficiency of the cutting process can be improved as compared with the case where the original processing program P1 is used as it is.

In the machine tool system 1 according to the above embodiment, the machine tool control device 10 has the machine tool path extraction unit 12, but the machine tool path extraction unit 12 may be arranged outside the machine tool control device 10. However, it may be arranged in the machining program correction unit 30.

For example, as in the machining system 1a shown in FIG. 5, a machining program correction device 30a located at a location physically separated from the machine tool control device 10 is used to create a machining path extraction unit 12, a comparison unit 31, and a correction machining program. The unit 32 may be provided.

The machine tool system 1a includes a machine tool control device 10, a shape measuring unit 20, a machining program correction device 30a, a machine tool 40, a data acquisition unit 50, and a server 60.

The data acquisition unit 50 is connected to the machine tool control device 10, the shape measurement unit 20, and the server 60 via network communication. The data acquisition unit 50 acquires the original machining program P1 from the machine tool control device 10 and acquires the actual shape data from the shape measurement unit 20. The data acquisition unit 50 transmits these information to the server 60. As the data acquisition unit 50, for example, a tablet computer or the like can be used.

The server 60 is connected to the machining program correction device 30a and the data acquisition unit 50 via network communication. The server 60 may be connected to the data acquisition unit 50 via a mobile 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 30a in response to the request from the processing program correction device 30a.

In the machining program correction device 30a, 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 extracts the actual shape data and the first. The first to third machining paths C1 to C3 are acquired, the non-contact machining path and the non-contact section are detected, and the correction machining program creation unit 32 generates the correction machining program P2. The modification processing program P2 generated by the processing program modification device 30a is input to the modification processing program execution unit 13 of the machine tool control device 10 via a storage medium (for example, a USB memory or the like) or via network communication. Will be done.

Even in such a machining system 1a, since the number of machining paths C and the feed rate of the cutting tool 41 can be optimized for each work W, cutting can be performed as compared with the case where the original machining program P1 is used as it is. It can be shortened.

1 Machine tool 10 Machine tool control device 11 Storage unit 12 Machine tool extraction unit 13 Correction processing program execution unit 20 Shape measurement unit 30 Processing program correction unit 31 Comparison unit 32 Correction processing program creation unit 40 Machine tool 41 Cutting tool W Work P1 Original Machining program P2 Modified machining program C1 First machining pass (non-contact machining pass)
C2 2nd processing pass (contact processing pass)
C3 3rd processing pass (contact processing pass)

Claims (7)

A work system that cuts a member to be machined with a cutting tool.
A shape measuring unit that generates actual shape data indicating the actual shape of the member to be processed, and
Based on the actual shape data acquired from the shape measuring unit and the machining path of the cutting tool specified in the original machining program, the cutting tool in the machining path does not come into contact with the member to be machined. A comparison unit that detects at least one of the machining path and the non-contact section in which the cutting tool does not contact the workpiece in the contact machining path in which the cutting tool contacts the member to be machined.
Based on the detection result of the comparison unit, and the number of processing paths, and, by modifying at least one of the feed speed in the processing path, a machining program correcting section that creates a correction processing program,
A machine tool control device that controls the operation of the cutting tool according to the correction machining program.
A work system equipped with. The machining program correcting section corrects the original machining program to delete the non-contact machining path,
The work system according to claim 1. The machining program correcting section corrects the original machining program as the feed rate of the non-contact interval is increased,
The work system according to claim 1 or 2. The process of generating actual shape data showing the actual shape of the member to be machined by the cutting tool, and
Based on the generated actual shape data and the machining path of the cutting tool specified in the original machining program, among the machining paths, the non-contact machining path in which the cutting tool does not contact the member to be machined, and the non-contact machining path in which the cutting tool does not contact the member to be machined. A step of detecting at least one of the non-contact sections in which the cutting tool does not contact the member to be machined in the contact machining path in which the cutting tool contacts the member to be machined.
Based on the detection result in the step of detecting at least one of the non-contact machining path and the non-contact section, the number of processing paths, and, by modifying at least one of the feed speed in the processing path, the correction processing program And the process of creating
A process of cutting the member to be machined by controlling the operation of the cutting tool according to the correction machining program.
A method of manufacturing a machined product. Based on the actual shape data showing the actual shape of the member to be machined by the cutting tool and the machining path of the cutting tool specified in the original machining program, the cutting tool of the machining paths is the machine to be machined. Detects at least one of the non-contact machining path that does not contact the member and the non-contact section in which the cutting tool does not contact the member to be machined in the contact machining path in which the cutting tool contacts the member to be machined. Comparison section and
Based on the detection result of the comparison unit, the number of the processing path, and, by modifying at least one of the feed speed in the processing path, comprising a correction processing program creating unit that creates a correction processing program,
Machining program correction device. The process of generating actual shape data showing the actual shape of the member to be machined by the cutting tool, and
Based on the generated actual shape data and the machining path of the cutting tool specified in the original machining program, among the machining paths, the non-contact machining path in which the cutting tool does not contact the member to be machined, and the non-contact machining path in which the cutting tool does not contact the member to be machined. A step of detecting at least one of the non-contact sections in which the cutting tool does not contact the member to be machined in the contact machining path in which the cutting tool contacts the member to be machined.
Based on the detection result in the step of detecting at least one of the non-contact machining path and the non-contact section, the number of processing paths, and, by modifying at least one of the feed speed in the processing path, the correction processing program And the process of creating
How to create a correction processing program comprising. Based on the actual shape data showing the actual shape of the member to be machined by the cutting tool and the machining path of the cutting tool specified in the original machining program, the cutting tool among the machining paths is the member to be machined. At least one of the non-contact machining path that does not come into contact with the machining path and the non-contact section in which the cutting tool does not contact the workpiece is detected in the contact machining path in which the cutting tool contacts the workpiece. based on the results, the number of the processing path, and, using the correction processing program created by modifying at least one of the feed speed in the processing path, and controls the cutting tool,
Machine tool control device.

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