JPH0899252A - Hole machining positioning path preparation in cad/cam system - Google Patents

Abstract

PURPOSE: To prevent continuous hole machining from occurring concentratedly in a specific machining range by searching a hole position to be machined apart from a hole position to be machined which is selected immediately before, select it as a position to be positioned for the next hole machining, and preparing a positioning path for a tool in a selecting order. CONSTITUTION: If the data of another hole position to be machined are stored, a CPU searches a position stored in a virtual current position storage register, namely a hole position to be machined which is positioned at the remotest position from a hole position to be machined which is selected immediately before, and selects it as the next hole position to be machines (step S5). A tool path to the first position to be machined is prepared (step S2). A machining program for quick-traversing the tool to the hole position to be machined is prepared, and a machining program through a boring fixed cycle in hole machining application is prepared based on the hole machining data of the selected hole position to be machined (step S6). The machining program defined at the first time works effectively as long as the boring fixed cycle is continuously operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for creating a hole machining positioning path in a CAD / CAM system.

[0002]

2. Description of the Related Art As a method for automatically determining a tool positioning path based on hole machining position data, a positioning movement path is created by selecting the order of hole machining so that the tool movement path is the shortest. There is already known a path creating method and a path creating method in which a machining order of hole positions is arbitrarily set at the designing stage of a hole and a tool moving path is created in accordance with the order. In general, the former is intended to speed up machining by shortening the tool path, and the latter is used when manually setting the order of hole machining according to circumstances.

FIG. 4 shows the shape A of the plate material to be processed.
5 is a schematic view showing an example of the CAD data when a large number of hole machining positions are defined, by visualizing, and the hole machining position data created in advance is indicated by the circles in the figure.
Therefore, for example, after the hole machining position P at the upper left end of the shape A is selected as the hole machining position to be machined first, the hole machining positioning path is created by the method belonging to the former of the above conventional techniques. Nonetheless, the result is the travel route B as shown by the broken line in FIG. Such a travel route B
Since the positioning movement amount of the tool is the minimum, it is suitable for high-speed machining of a large number of holes with rough accuracy. But,
If drilling is densely defined in an area,
Since frictional heat due to processing is concentrated in that region, there is a problem that the processing target is thermally deformed in the actual processing stage. For example, in the example of FIG. 4, the area C surrounded by the one-dot chain line corresponds to this. Such a problem is particularly prominent in a material having a low thermal conductivity and easily accumulating heat around the processing position, a material having a small plate thickness and easily deformed by heat, and the like. Also, since the processing target itself expands thermally, even if a hole is drilled using a tool with a normal diameter, there may be a problem that the normal hole diameter cannot be obtained when the processing target returns to room temperature. is there.

Therefore, when the hole machining is dense, it is necessary to manually set the order of the hole machining so that the adjacent hole machining positions are not continuously machined. If there are a lot of them, the manual setting operation will be troublesome, and if you create a tool path while overlooking the hole machining position where you have forgotten to set the order, unmachined holes will be created, so re-machining is necessary. There is also the problem that

[0005]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to solve the above-mentioned drawbacks of the prior art, and even if the holes are densely defined in a specific area, the object to be processed is to be processed. The object of the present invention is to provide a method for creating a hole machining positioning path in a CAD / CAM system that can perform accurate hole machining without causing thermal deformation or error in hole diameter.

[0006]

According to the present invention, a hole machining position to be machined first is selected as a positioning position, and then a hole machining position which is far from the immediately preceding hole machining position is searched for. The above-described object is achieved by a configuration characterized in that a positioning movement path of the tool is created by selecting a positioning position for the next hole machining.

[0007]

Function: First, the hole machining position to be machined is selected as the positioning position. Below, the hole drilling positions that are distant from the hole drilling position selected immediately before are searched and sequentially selected as the positioning positions for the next hole drilling, and the tool positioning movement path is determined based on the hole drilling position data. create.

Since the holes are not continuously drilled in a specific area, deformation of the object to be processed due to local heating is prevented. Further, as a result of mitigating local thermal expansion of the processing object, the processing accuracy of the hole diameter is improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an automatic programming device (CAD) of an embodiment to which a hole machining positioning path creating method according to the present invention is applied.
FIG. 1 is a block diagram showing a schematic configuration of a / CAM system), 1 is a microprocessor (hereinafter referred to as CPU), 7 is a ROM storing a control program of the automatic programming device, and 2 is loaded from a floppy disk 11. RAM for storing system programs and various data, 3 is a keyboard provided with a mouse 3a, 4 is a CRT display device (hereinafter, referred to as a display unit).
CRT), 8 is a disk controller, 10 is a floppy disk storing system programs, 9
Is an XY plotter for outputting a created drawing, 5 is a printer, and these elements are connected via a bus 6.

The mouse 3a provided on the keyboard 3 is
A system program for various processing operations by designating an arbitrary position on the display screen of the CRT 4 by moving the graphic cursor on the CRT 4 and performing an instruction operation, and selecting a function menu from the menu screen of the CRT 4. Used when starting.

A shape inputting operation of a machining target and a setting operation of a hole machining position using this kind of automatic programming device (CA
D function) and a function to automatically create NC data based on the shape of the object to be processed, hole processing position and hole processing data (CAM
(Function) etc. are already known, so the explanation is omitted.
Assuming that the shape input operation of the plate A as shown in FIG. 3 and the input operation of a large number of hole drilling positions (including hole drilling data) as shown by a circle are completed, refer to the flowchart of FIG. The "hole drilling positioning path creation process for precision machining" by the CPU 1 will be described. Note that P shown in FIG. 3 is a hole drilling position to be machined first, and it is assumed that the definition has already been completed at the stage of the operation of inputting the hole drilling position. As a matter of course, the automatic programming device of this embodiment is similar to the conventional route creating process, that is, a tool, for a large number of hole machining positions defined by circles for the shape of the plate A as shown in FIG. Selects the order of hole drilling to create the shortest moving path, and creates a positioning moving path. Hole processing for high-speed processing Positioning path creation processing (see Fig. 4) or manual operation for all holes It is also possible to perform a manually set type hole machining positioning path creation process that automatically creates a tool positioning movement path based on the machining order and position data of each hole by setting the machining order. However, here, description of publicly known matters is omitted, and when the plate A is thin, or when precision is required for finishing the hole diameter, "a hole drilling position for precision machining" Only described a case where determined route generation processing "is selected by the function menu.

Therefore, "a hole drilling position for precision machining is determined.
CPU1 that started the "path creation process" first
CAD data storage of pea disk 10 or RAM2
From the CAD data stored in the area,
Position data of the drilling position to be used and the drilling data corresponding to each
Read all data into a temporary storage file in RAM2
After memorizing, drilling defined as the first drilling position P
Read the position data of the work position from the temporary storage file
(Step S1), the tool is moved from the retracted position to the initial level.
A machining professional for moving to the hole machining position P along the
While creating a gram (hole machining positioning path),
Fixing holes at hole drilling position P based on drilling data
Create a machining program for the cycle (step S
2). Simplify the machining program created by this process
An example is shown below. G X Y Z R  G in the machining program To specify the drilling mode
This is a G code related to drilling by normal drilling.
In the case of a fixed machining cycle command, the G81 fixed service
Uccle is used. X And Y (Hole processing position
Position data) is for hole drilling on the initial level surface.
Positioning position, and thus X in the example above. And
And Y Set the X-axis component and the Y-axis component of the hole machining position P
Will be dealt with. Also, R Is the initial level
To the actual machining start position, in short, the
Plate where the tip of the tool at the vertical level is the processing target
It is the distance in the Z-axis direction until it contacts the upper surface of A, and Z
(Hole processing data) The tip of the tool contacts plate A
It is the distance in the Z-axis direction from the position to the bottom of the hole. Of course,
The initial level itself is the position of the tool from hole position to hole position.
The tip is machined when moving non-cutting for placement
Select a height that does not interfere with the target plate A.
Has been. Also, for positioning from hole position to hole position
As for the feed speed of, the fast feed speed by G00 is generally applied.
To be done.

That is, in the above-described example, by the processing of step S2, a machining program for fast-forwarding the tool at G00 from the tool retract position to just above the first hole machining position P along the initial level surface (hole machining positioning) Route)
And a machining program for lowering the tip of the tool at the initial level to the upper surface of plate A at a rapid feed rate, a machining program for cutting and feeding the tool from the upper surface of plate A to the hole bottom, and the hole level to the initial level A machining program for retracting the tool is created.

Although the machining program for the fixed drilling cycle has been described above by way of example, the hole machining positioning path in this embodiment relates to the tool movement for the positioning from the hole position to the hole position. It is related to tool movement on the initial level surface and does not impose any restriction on the usage of the fixed cycle or the like.

The CPU 1 which has created the machining program (hole machining positioning path) for moving the tool to the first hole machining position P and the machining program for the fixed drilling cycle at that position, stores the first hole in the virtual current position storage register. After the position data of the machining position P is stored and the position data of the first hole machining position P is deleted from the temporary storage file of the RAM 2 (step S3), the position data of other hole machining positions is stored in the temporary storage file of the RAM2. It is determined whether or not is stored (step S4).

Then, if the position data of another hole drilling position is stored, the CPU 1 stores the position stored in the virtual current position storage register, that is, the position farthest from the hole drilling position P selected immediately before. (However, in this embodiment, Z
A hole drilling position Q located in the axial distance is not considered) is searched and selected as the next drilling position (step S).
5) In the same manner as the processing of step S2 described above, a machining program (hole machining positioning path) for rapidly moving the tool to the hole machining position Q is created, and the hole machining data of the selected hole machining position Q is created. Based on this, a drilling fixed cycle machining program at the hole machining position Q is created (step S6). While the fixed drilling cycle is continuously performed, each data of the machining program initially defined in step S2 is carried over as it is and effectively operates (modal). Therefore, the hole machining mode, the initial level, the hole If there is no difference for each hole in the specification of hole drilling data such as the depth of the bottom, X in the drilling program shown as an example.
And Y The item of (position data of hole machining position) is only newly added as a machining program.

Next, the CPU 1 stores the position data of the hole machining position Q selected this time in the virtual current position storage register, and further deletes the position data of the selected hole machining position Q from the temporary storage file of the RAM 2. After (Step S
7) Then, the process proceeds to the determination process of step S4 again.

Hereinafter, until the position data of the hole machining position is no longer detected from the temporary storage file of the RAM 2,
The CPU 1 repeatedly executes the processing from step S4 to step S7 in the same manner as described above so that the hole drilling position farthest from the previously selected hole drilling position becomes the next positioning position, and A machining program for the positioning movement path and a fixed cycle program for drilling at each position (unnecessary if the hole machining data are the same) are sequentially created. An example of the created positioning movement path of the tool is shown by a broken line B'in FIG.

According to the positioning movement path of the tool thus created, unlike the conventional example shown in FIG. 4, the adjacent drilling positions are not continuously drilled, so that the plate A of the plate A is not drilled continuously. Even if the plate is thin or the plate A is made of a material having a low thermal conductivity, the plate A will not be thermally deformed by the frictional heat due to local processing. Further, since the material is less expanded by heat, the hole diameter does not shrink even if the material is returned to room temperature after processing, and high processing accuracy is maintained.

In the example shown in FIG. 3, a large number of hole drilling positions are polarized and concentrated on the left and right sides of the plate A, and as a result, the tool is drilled while moving back and forth between the left and right groups. Even in such a case, at least while the hole machining position (for example, P) belonging to the left group and the hole machining position (for example, R) located in the vicinity thereof are machined away from them. The cooling time is given to the left side portion of the plate A by the time required for processing at the hole processing position (for example, Q) of the right group in the open position. In the conventional example of FIG. 4, when machining adjacent hole machining positions one after another, the machining is intermittently performed by providing an interval equal to the machining time required for one hole between each machining. Will bring a similar cooling effect to plate A. In this embodiment, further,
Since the time corresponding to the interval is used to perform processing at other hole processing positions that have no thermal influence, if the conditions of the interval time are the same, compared to the case of taking the interval in the example of FIG. That is, substantially double the processing speed can be obtained.

As an extreme example, there are cases where a large number of hole machining positions are densely defined on only one straight line.
In such a case, the “drilling positioning path creating process for precision machining” according to this embodiment may be out of the applicable range. In such a case, since the hole drilling proceeds from both ends on the straight line inward, no matter where the first hole drilling position is specified, the hole drilling position remaining in the center of the straight line This is because continuous machining will be performed.To solve this, the conventional manual setting such as creating the positioning movement path of the tool by manually setting the machining order for all holes In some cases, it may be necessary to perform an expression route creation process. However, even if a large number of hole machining positions are densely defined on only one straight line, machining is never performed continuously from one side of the straight line. Considering that the central part of the object to be processed has a substantially higher heat transfer efficiency than the end part of the object to be processed, rather than the heat being accumulated in the outer peripheral part of the object to be locally deformed, As a result, it is preferable that the heat generated in the central portion of the processing target be efficiently transmitted to the entire processing target.

[0022]

According to the method for creating a hole machining positioning path of the present invention, a hole machining position distant from the previously selected hole machining position is sequentially searched and selected as a positioning position for the next hole machining, Since the tool positioning movement path is created according to the selection order, it is not possible to continuously perform hole drilling by concentrating on a specific area of the machining target, and as a result, by local heating of the machining target. Thermal deformation,
Also, the post-contraction of the hole diameter is prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a configuration of an automatic programming apparatus of an embodiment to which a hole machining positioning path creating method according to the present invention is applied.

FIG. 2 is a flowchart showing an outline of hole machining positioning path creation processing by the automatic programming device of the embodiment.

FIG. 3 is a conceptual diagram showing an example of a hole machining positioning path created by a hole machining positioning path creating process of the embodiment.

FIG. 4 is a conceptual diagram showing an example of a hole machining positioning path created by a conventional method.

[Explanation of symbols]

 1 Microprocessor (CPU) 2 RAM 7 ROM A Processing target (plate) B'Hole processing positioning path P, Q, R Hole processing position

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Morisaka 3580 Koshinoba, Oshinomura, Minamitsuru-gun, Yamanashi Prefecture FANUC Co., Ltd. Address 3580 Inside FANUC CORPORATION

Claims (1)

[Claims] 1. A CA for automatically determining a drilling positioning path based on previously created drilling position data.
In the method for creating a hole machining positioning path in the D / CAM system, after the hole machining position to be machined first is selected as the positioning position, the hole machining positions that are distant from the hole machining position selected immediately before are sequentially searched. A method for creating a hole machining positioning path in a CAD / CAM system, characterized in that a tool positioning movement path is created so that the hole machining is not concentrated on a part by selecting a positioning position for the next hole machining.