JP7321517B2 - NC data change device and NC data change program - Google Patents

Description

The present invention relates to an NC data changing device and an NC data changing program for changing NC data used for machining an object to be machined by a machining device.

In the case of a processing apparatus that performs NC (numerical control) processing, NC data created by CAM (computer aided manufacturing) or the like is used. In order to apply NC data to actual machining, there are errors in the characteristics of the machining equipment and the shape of the machining object, so simulations and trial machining are performed and trial and error are repeated to optimize the machining work. There is

For example, in Patent Document 1, a simulation is performed based on data indicating the shape of an object to be machined and NC data, a state in which the machining tool bites into the object to be machined is detected, and the position of the machining tool of the machining apparatus is adjusted so as not to bite into the object. Machining work is optimized through automatic correction.

Japanese Patent Application Laid-Open No. 2009-266000

As mentioned above, it has been proposed to optimize the machining work by correcting the position of the machining tool and the feed rate based on the acquired NC data, but shortening the machining time to reduce the machining cost. It is also important to In the prior art, the machining time has been shortened by increasing the feed rate of the machining tool while considering the tool resistance during machining using simulations or the like.

However, among the machining processes, there is a so-called air cutting process in which the machining tool moves in space without contacting the machining target. In this air cutting process, the machining tool is moved along the outline of the object to be machined. The inventors have found that the intended feed rate cannot be achieved.

SUMMARY OF THE INVENTION The present invention has been made based on the findings of the inventors, and aims to provide an NC data changing device and an NC data changing program for changing NC data so as to simplify the operation of a machining tool.

To achieve the above object, an NC data changing apparatus according to one aspect of the present invention includes an acquisition unit for acquiring NC data, which is numerical information indicating the position of a machining tool with respect to an object to be machined; a section identification unit that identifies the start position and the end position of a non-contact movement section that moves without contacting the NC data based on the obtained NC data; and a changing unit for changing the movement path to a movement path configured by a straight line.

In order to achieve the above object, an NC data change program according to one aspect of the present invention includes an acquisition unit for acquiring NC data, which is numerical information indicating the position of a machining tool with respect to a machining object; A section identification unit that identifies a start position and an end position of a non-contact movement section that moves without contacting an object based on the acquired NC data, and three or more moving routes of the non-contact movement section in the NC data and a changing unit for changing the moving route to a moving route formed by a straight line of .

According to the present invention, the machining time can be shortened by simplifying the movement path of the machining tool in the non-contact movement zone, which is the zone in which the machining tool moves without contacting the object to be machined.

FIG. 1 is a perspective view showing an object to be processed and a product after processing side by side. FIG. 2 is a block diagram showing the functional configuration of the NC data change device realized by the NC data change program. FIG. 3 is a side view showing a movement path before changing the non-contact operation section in scanning line processing. FIG. 4 is a plan view showing a movement path before changing the non-contact operation section in contour line machining. FIG. 5 is a side view showing the movement route after changing the non-contact operation section. FIG. 6 is a flow chart for explaining the operation flow of the NC data changing device.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an NC data changing device and an NC data changing program according to the present invention will be described below with reference to the drawings. Numerical values, shapes, materials, components, positional relationships of components, connection states, steps, order of steps, and the like shown in the following embodiments are examples, and limit the invention according to each claim. not the gist of it. In the following, multiple inventions may be described as one embodiment, but constituent elements not described in claims are described as optional constituent elements with respect to the claimed invention. . In addition, the drawings are schematic diagrams in which emphasis, omissions, and ratios are appropriately adjusted in order to explain the present invention, and may differ from actual shapes, positional relationships, and ratios.

FIG. 1 is a perspective view showing an object to be processed and a product after processing side by side. A processing target 200 is a material that is processed by a processing tool 210 into a product 220 having a predetermined shape. The shape of the object 200 to be processed is not particularly limited, but in the case of the present embodiment, it will be described as a cube as shown in the upper part of FIG. For the sake of explanation, the workpiece 200 and the product 220 are described as stepped shapes composed of simple straight lines, but the product 220, for example, has a complex shape with smooth curves. I don't mind.

The processing tool 210 is not particularly limited as long as it is a tool for processing the object 200 to be processed. In the case of this embodiment, the processing tool 210 is a cutting tool, specifically a square end mill (ordinary blade). The processing tool 210 is not limited to a cutting tool, and may be a tool that plastically deforms the object 200 to be processed, a tool used for electric discharge machining, a grinding tool, a polishing tool, or the like.

FIG. 2 is a block diagram showing the functional configuration of the NC data change device realized by the NC data change program. The NC data changing device 100 is a device implemented by executing an NC data changing program on a computer, and is a device for changing the tool path of acquired NC data. The NC data modification device 100 includes an acquisition section 110, a section identification section 120, and a modification section . In the case of this embodiment, the NC data change device 100 has a canceling section 140 .

Acquisition unit 110 acquires NC data, which is numerical information indicating the position of machining tool 210 with respect to workpiece 200 , from external device 300 such as a CAM (Computer Aided Manufacturing) system. The acquisition unit 110 may acquire shape data indicating the shape of the object 200 to be processed, the shape of the product 220 and the like from a CAD (Computer Aided Design) system, which is the external device 300 .

Based on the NC data acquired by the acquisition unit 110, the section identification unit 120 identifies the start position and end position of a non-contact operation section in which the machining tool 210 moves without contacting the workpiece 200. FIG.

The method by which the section identification unit 120 identifies the start position and end position of the non-contact motion section is not particularly limited. For example, when the NC data is represented by scanning line processing, the section specifying unit 120 determines that the processing tool 210 is moved in the height direction (the Z-axis direction in the figure) as indicated by the pre-change NC data 301 shown in FIG. The position when the movement is started may be specified as the start position S of the non-contact motion section. In addition, the position when the machining tool 210 returns to the position obtained by adding the depth of cut Ad in the axial direction of the machining tool 210 to the height when the machining tool 210 starts moving in the height direction is defined as the position of the non-contact operation section. You may specify as the end position F.

Specifically, in the pre-change NC data 301, the coordinate Zt indicating the height position of the machining tool 210 remains constant at the value Za, and thereafter the height component changes in the axial direction of the machining tool 210 (the Z-axis direction in the drawing). When the cutting amount Ad increases, that is, when the formula Zt>Za+Ad is satisfied, it is determined that the non-contact operation has started, and the coordinates (Xt1, Yt1, Za) at the time t1 at which Zt increases are set to the non-contact operation section is identified by the section identification unit 120 as the start position S of . Also, the end position F of the non-contact motion section is specified as the coordinates (Xt2, Yt2, Za+Ad) at time t2 when the machining tool 210 contacts the workpiece 200 again.

When the NC data is represented by contour line machining, the section specifying unit 120 determines that the machining tool 210 is machined within a contour plane (XY plane in the figure) as indicated by the pre-change NC data 301 shown in FIG. A position that does not overlap with the target 200 is specified as the start position S of the non-contact motion section. Also, the position immediately before the machining tool 210 overlaps the machining target 200 again within the same contour plane (XY plane in the figure) is identified as the end position F of the non-contact motion section.

In addition, the section identifying unit 120 executes the machining simulation based on the NC data before the change, so that the position where the machining tool 210 no longer overlaps with the machining target 200, that is, the interference amount between the machining tool 210 and the machining target 200 is zero. Alternatively, a position close to 0 may be specified as the start position S of the non-contact motion interval, and the position immediately before overlapping again may be specified as the end position F of the non-contact motion interval. The type of processing simulation is not particularly limited, and simulations using a Z-Map model, a Voxel model, an outline model, etc. can be exemplified.

The change unit 130 changes the movement path of the non-contact motion section in the NC data before change identified by the section identification unit 120 to be three or more linear movements and the number of linear movements is as small as possible. In the case of the present embodiment, as shown in FIG. 5, the changing unit 130 changes the pre-change NC data 301 to the post-change NC data 302 so that the movement path in the non-contact operation section is three linear movements. . Also, the three linear movements changed by the changing unit 130 are straight lines that can be moved by only one of a plurality of motors corresponding to the linear machining axes of the processing device 310 .

The linear machining axis is an axis different from the rotation axis and the tilt axis, and is an axis that allows the machining tool 210 to be linearly moved by a single motor. In the case of this embodiment, the processing device 310 has linear processing axes in the X-axis direction, the Y-axis direction, and the Z-axis direction. Therefore, the changing unit 130 linearly raises the machining tool 210 along the Z-axis from the start position S (Xt1, Yt1, Za) of the non-contact operation section (first tool), and the end position F ( Xt2, Yt2, Za+Ad) is moved linearly along the Y-axis (the second tool), and linearly to the end position F (Xt2, Yt2, Za+Ad) of the non-contact operation section. The path is changed to the (third) path for lowering the machining tool 210 . In the case of this embodiment, the changing unit 130 changes the NC data so that the machining tool 210 moves within a plane that includes two of the machining axes (in this embodiment, the YZ plane). Therefore, one component of the coordinates of the start position S (X in this embodiment) and one component of the coordinates of the end position F of the non-contact motion section have the same value.

In addition, the changing unit 130 sets the highest position of the changed path above the highest height position Zmax of the unmachined object to be machined. If there are a plurality of non-contact motion sections in the NC data before change, the highest positions of the non-contact motion sections in the NC data after change by the changing unit 130 are at the same height position. In the case of the present embodiment, since the movement paths of the non-contact operation section after the change are three, ie, the upward movement, the horizontal movement, and the downward movement, the height position of the horizontal movement is the maximum height of the unmachined object to be machined. Above the position Zmax. According to this, regardless of the shape of the product 220, it is possible to guarantee that the machining tool 210 and the machining target 200 do not interfere with each other without verification. In addition, it is possible to easily change the movement route in the non-contact operation section.

The canceling unit 140 acquires the pre-change movement time indicating the movement time of the machining tool 210 based on the NC data before change in the non-contact operation section, and acquires the same non-contact operation section based on the NC data changed by the change unit 130. is longer than the pre-change movement time, the change of the NC data in the non-contact operation section is undone. Note that the canceling unit 140 may compare the movement time before and after the change after the change of the movement route of all the non-contact motion sections in the NC data acquired by the acquisition unit 110 is completed. Each time the route is changed, the travel times before and after the change may be compared.

Next, the operation of the NC data changing device 100 will be explained. FIG. 6 is a flow chart for explaining the operation flow of the NC data changing device. As shown in the figure, the acquiring unit 110 acquires NC data for machining the machining target 200 from the external device 300 (S101). Next, the section identification unit 120 identifies the start position S and the end position F of the movement path of the non-contact movement section from the acquired NC data (S102). In the case of this embodiment, the section identifying section 120 identifies all non-contact motion sections in the NC data.

Next, the changing unit 130 sequentially changes all the specified non-contact motion sections to three straight lines (S103). In the case of this embodiment, not only when the NC data before change is represented by scanning line processing, but also when it is represented by contour line processing, the three movements of upward movement, horizontal movement, and downward movement are applied. Change to the path of linear movement of the book. The same is true when the non-contact operation section is specified by simulation.

Next, the release unit 140 compares the travel time before and after the change every time the route of the non-contact motion section is changed (S104), and if the travel time after the change is longer than the travel time before the change (S104: Yes), for the non-contact operation section, the change of the moving route is canceled and the original NC data is restored (S105). When the travel time after change is shorter than the travel time before change (S104: No), the NC data after change is adopted for the non-contact operation section.

For example, as shown in FIG. 4, when the movement path of the machining tool 210 in the non-contact operation section in the NC data before change 301 moves along one machining axis (Y-axis), the change by the change unit 130 is cancelled. likely to be

The processing by the canceling unit 140 is executed for each non-contact motion interval (S106), and when all the non-contact motion intervals have been determined (S106: Yes), the operation of the NC data changing device 100 ends.

By executing the above-described NC data change program in the NC data change device 100, the moving route of the non-contact operation section in the NC data is changed to a simple linear route of about three. Therefore, as shown in the pre-change NC data 301 in FIG. 5, the machining tool 210 should be moved at the maximum speed or at a speed close to it, rather than a movement path in which direction changes are repeated before the maximum movement speed of the machining tool 210 is reached. It is possible to secure a long distance in which the movement is possible, and to shorten the movement time in the non-contact operation section. As a result, it is possible to reduce the overall machining time using NC data.

Further, by aligning the movement path after the change with the machining axis of the processing device 310, the processing device 310 can move the processing tool 210 most quickly, and simultaneously drive a plurality of motors to perform diagonal or curved processing. The machining time can be further shortened compared to the case where the tool 210 is moved.

In addition, by comparing the travel time in the movement route before and after the change in the non-contact movement section and adopting the shorter movement time, the movement route in the non-contact movement section is optimized, and the overall machining time can be shortened.

It should be noted that the present invention is not limited to the above embodiments. For example, another embodiment realized by arbitrarily combining the constituent elements described in this specification or omitting some of the constituent elements may be an embodiment of the present invention. The present invention also includes modifications obtained by making various modifications to the above-described embodiment within the scope of the gist of the present invention, that is, the meaning of the words described in the claims, which a person skilled in the art can think of. be

For example, in the above embodiment, the processing tool 210 is a square end mill. I don't mind. Further, depending on the NC data, machining may be performed by switching between a plurality of types of machining tools 210 .

The NC data to be changed by the NC data changing device 100 and the NC data changing program can be applied to arbitrary NC data such as NC data for rough machining and NC data for finish machining.

INDUSTRIAL APPLICABILITY The present invention can be used for NC data provided to NC processing equipment.

100 Data change device 110 Acquisition unit 120 Section identification unit 130 Change unit 140 Release unit 200 Processing object 210 Processing tool 220 Product 300 External device 301 NC data before change 302 NC data after change 310 Processing device

Claims (7)

an acquisition unit that acquires NC data, which is numerical information indicating the position of the machining tool with respect to the object to be machined;
a section specifying unit that specifies a start position and an end position of a non-contact operation section in which the machining tool moves without contacting the machining object, based on the acquired NC data;
a changing unit that changes the movement path of the non-contact operation section in the NC data to a movement path composed of three or more straight lines ;
At least one of the linear movements changed by the changing unit is a straight line that can be moved by only one of a plurality of motors respectively corresponding to the linear machining axes of the machining device to which the NC data is applied. NC data change device. The section identification unit
2. The NC data changing apparatus according to claim 1, wherein, in the case of NC data represented by scanning line processing, a movement start position in the height direction is specified as the start position of the non-contact operation section. The section identification unit
2. The NC data changing apparatus according to claim 1, wherein, in the case of NC data represented by contour line machining, a position at which the machining tool no longer overlaps with the machining object within the contour plane is specified as the start position of the non-contact operation section. . The section identification unit
2. The NC data changing apparatus according to claim 1, wherein a position at which the machining tool no longer overlaps with the machining object is specified as the starting position of the non-contact operation section by machining simulation executed based on the NC data before the change . The change unit
5. The NC data changing device according to any one of claims 1 to 4, wherein the highest position of the changed path is set above the highest height position of the machining object. In the non-contact motion section, a pre-change travel time indicating the travel time of the machining tool based on the NC data before change is acquired, and the travel time of the machining tool in the same non-contact motion section based on the NC data changed by the change unit. 6. The NC data changing apparatus according to any one of claims 1 to 5 , further comprising a canceling unit that undoes the change of the NC data in the non-contact operation section when is longer than the pre-change movement time. an acquisition unit that acquires NC data, which is numerical information indicating the position of the machining tool with respect to the object to be machined;
a section specifying unit that specifies a start position and an end position of a non-contact operation section in which the machining tool moves without contacting the machining object, based on the acquired NC data;
a changing unit that changes the movement path of the non-contact motion section in the NC data to a movement path composed of three or more straight lines;
An NC data change program for functioning
At least one of the linear movements changed by the changing unit is a straight line that can be moved by only one of a plurality of motors respectively corresponding to the linear machining axes of the machining device to which the NC data is applied.
NC data change program .

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