JP2901360B2 - Area processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an area machining method in an automatic programming device for automatically creating an NC program for a numerical control (NC) machine tool.

[0002]

2. Description of the Related Art In NC processing, there is a region processing in which an inside of a region surrounded by an outer curve formed of a straight line, a circular arc or the like is hollowed out to a predetermined depth. Conventional area machining method performs tool movement in one direction (solid arrow direction) along the (i-1) th machining path l _i-1, as shown in FIG. 7, the following from the end point P _e as pick feed path for performing a starting point tool moves to P _s of the i-th machining path l _i, the rising passageway a a predetermined amount increases moving from the end point P _e, changing passage is shifted to a position just above the start point P _s b and, by sequentially determining the descending passage c to move downward to the starting point P _s and a method of repeated unidirectional machining.

[0003] As another conventional area machining method performs tool movement along the (i-1) th machining path l _i-1, as shown in FIG. 8, first from the end point P _e of the following As a pick feed path for performing a tool movement to the start point P _{s of the} i-th processing path l _i , a second start path d ₂ that moves from the end point _Pe to the start point P _s along the contour curve is determined and reciprocated. There is a method of performing processing.

[0004]

In the former one-way machining of the conventional area machining methods described above, the next machining passage is formed by moving the tool in the descending passage c forming the pick feed passage as shown in FIG. at the start point P _s of the l _i cut machining of a tool the bottom there was a possible cause of tool breakage occurred. Further, even if the latter reciprocating processing is performed to avoid this, the processing path is divided by the shape of the outer curve and the direction of the processing path as shown in FIG. 10, for example, so that continuous processing cannot be performed. may employ forced to work the same pick-feed path, scribing of the tool bottom at the start point P _s of the next machining path l _i sometimes becomes a cause of tool breakage occurred .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a machining path in which a plurality of machining paths are used to move a tool in an area surrounded by an outer curve. Prevents tool breakage by creating a partial passage that does not cause cutting at the bottom of the tool even if the tool moves downward in the partial passage that constitutes the pick feed passage that moves the tool when changing the tool It is an object of the present invention to provide a region processing method capable of performing the following.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an area machining method for machining by moving a tool through a plurality of machining paths in an area surrounded by an outer curve composed of at least one piece. An object of the present invention is to provide a pick feed passage for performing a tool movement from an end point of the first machining passage to a start point of the second machining passage, an ascending passage moving upward by a predetermined amount from the end point of the first machining passage, , in the vicinity of the starting point of the second machining path, and changing passage moving from quasi starting points on processed the machining path adjacent to the second processing path in a predetermined amount above the position, is achieved as performing the down passage for downward movement to the associated start point on the processed working path, sequentially determines and region processing and start passage to move to the start point of the second processing path You.
The object of the present invention is also to provide a method for starting the second machining path.
Point and the end point of the machined machining path
Construct the pick feed passage when on a curve
As a start passage, a quasi-start point on the processed work passage
A first starting path moving from the
From the end point of the processing path to the start point of the second processing path,
The second starting path moving along the contour curve is sequentially determined.
Achieved by making the area machining
It is.

[0007]

According to the present invention, when the pick feed passage is formed in the region machining, the cutting process is not performed on the bottom surface of the tool, so that the breakage of the tool can be prevented.

[0008]

FIG. 1 is a block diagram showing an example of an area machining NC program creating section of an automatic programming device for realizing the area machining method of the present invention. Machining method to determine the machining path for input area machining, width between paths,
Processing path parameter CPP such as distinction between one-way / reciprocating processing
Is sent to the machining path creating means 4. In addition, the contour curve shape OLN, which is a closed curve composed of straight lines, arcs, curves, and the like, for determining the range of the region machining input from the data input / output means 7 is input by the contour curve shape input means 2. 4 and the pick feed path creating means 5. Further, by the processing condition parameter input means 3,
Processing condition parameters CNP such as a tool number, a feed speed, and a conversion unit input from the data input / output unit 7 are sent to the NC program conversion unit 6.

A machining path shape for performing region machining is determined by the machining path parameter CPP by the machining path creating means 4, and a portion inside the outer curve shape OLN is determined based on an intersection state between the machining path shape and the outer curve shape OLN. Is generated and sent to the pick feed path generating means 5 as processing path information CP.

[0010] Pick feed path information PP for performing tool movement when changing the processing path is created based on the processing path information CP and the outline curve shape OLN by the pick feed path creating means 5, and an NC program together with the processing path information CP. It is sent to the conversion means 6.

The processing path information CP and the pick feed path information PP are converted into an NC program by the processing condition parameter CNP by the NC program conversion means 6 and output to the outside.

In such a configuration, the flow of the process of generating the pick feed path information PP from the processing path information CP and the outline curve shape OLN in the pick feed path generating means 5, which is the main part, is shown in the flow charts of FIGS. Will be described. A processing path number i for recognizing a processing path to be processed at present is initialized to a first processing path (step S).
1). It is determined whether the processing path i being processed is the first processing path (step S2). If the processing path being processed is the first processing path, there is no immediately preceding processing path. An initial path to a start point _{Ps1 of} a processing path with a processing path number 1 (hereinafter, referred to as a first processing path) is created (step S3). Then, the starting point P of the first machining path
The initial path to _s1 and the first processing path are output as pick feed path information PP and processing path information CP (step S4). Thus, the processing for the first processing path is completed, the next processing path number is set (i = i + 1, etc.) to execute the processing for the next processing path (step S5), and the set processing path number is set. It is determined whether or not the machining path exists in the machining path information CP (step S6). If the machining path does not exist in the machining path information CP, all the processes are terminated, and the machining path is changed to the machining path information CP. If it exists in the CP, the process returns to step S2.

On the other hand, if the processing path i being processed is not the first processing path in the judgment step S2, there is an (i-1) th processing path processed immediately before the processing path i.
A pick feed path for moving the tool from _ei-1 to the start point _Psi of the i-th processing path being processed is created below.
First, a machining path adjacent to the i-th machining path (a machining path that has already been output as machining path information to the NC program creating means 6 by the pick feed path creating means 6) is investigated by the machining path information CP. Is determined as j (step S7). A quasi-start point P _e ′ close to the start point P _si of the i-th processing path being processed on the j-th processing path is determined (step S8), and a quasi-start point P _e ′ of the j-th processing path close to the quasi-start point P _e ′ is determined. The end point is determined as P _ee ′ (step S9). Next, the start point P _si and P _ee is the end point of the j-th processing path of the i processing path in _process' determines whether or not adjacent on the outer curved OLN (step S10).

For example, as shown in FIG. 4, when the start point _Psi of the i-th machining path and the end point P _ee ′ of the j-th machining path are not adjacent to each other, the i-1th machining path processed last time is not used. Passage a that moves up by a predetermined amount h from the end point P _{ei-1 of}
Is created (step S11), and a changed passage b that moves from the quasi-start point P _e ′ on the j-th machining passage to a point above by a predetermined amount h is created (step S12). Further, a descending passage c that moves downward to the quasi-start point P _e ′ on the j-th machining path is created (step S13), and finally the i-th machining path being processed from the quasi-start point P _e ′ on the j-th machining path. A start path d that moves to the start point _Psi is created (step S14). The pick feed path and the i-th processing path created in this way are output as pick feed path information PP and processing path information CP (step S4), and the above-described steps S5 and S5 are performed.
Proceed to S6.

On the other hand, in the judgment step S10, for example, as shown in FIGS. 5 and 6, when the starting point P _si of the i-th machining path and the end point P _ee ′ of the j-th machining path are adjacent on the outer curve OLN. In step S15, it is determined whether the (i-1) th processing path processed last time is the same as the jth processing path.
, The i-th machining path does not coincide with the j-th machining path (FIG. 5), or even if they coincide, the end point P _ei-1 and j-th (= i-) of the j-th (= i-1) machining path. 1) When the end points P _ee ′ on the machining path are not the same point (FIG. 6), (Step S1)
6) Then, the ascending passage a, the changed passage b, and the machining passage c are sequentially created by the same processing as the above-described steps S11 to S13 (steps S17 to S19). Then, the first start path d ₁ that moves along the j-th processing path from the quasi-start point P _e ′ on the j-th processing path toward the end point P _ee ′ of the j-th processing path.
Create a (step S20), the end to create a second start passage _{d 2} which moves along the outer curved shape OLN the starting point of the i processing passage from the j processing path end point _{P ee} of 'Psi (step S21 ). The pick feed path and the i-th processing path created in this way are output as pick feed path information PP and processing path information CP (step S).
4) The process proceeds to steps S5 and S6 described above.

On the other hand, judgment steps S10, S15, S1
In 6, the start point P _si of the i-th machining path and the end point P _ee ′ of the j-th machining path are adjacent on the outer curved line OLN, and the j-th machining path and the (i-1) -th machining path are the same and the j-th machining path is the same. End point P _ei-1 of the machining path and end point P _ee ′ of the j-th machining path
8 includes the reciprocating machining shown in FIG. 8, and all of the ascending passage a, the changing passage b, the descending passage c, the starting passage d, and the first starting passage d1 constituting the pick feed passage described above are included. Since it is unnecessary, the end point P _ee ′ of the j-th machining path
(Actually the same as the end point P _ei-1 of the (i-1) th machining path)
Outer curved shape to the starting point _{P si} of the i processing passage from OLN
Creating a second start passage _{d 2} which moves along the process proceeds to pick feed passage and then (step S21), and step S4, S5, S6 described above.

In the above-described embodiment, the inside of the closed curve determined by the outer curve shape OLN has been described as the processing area. However, the closed curve that determines the processing prohibited area included in the closed curve determined by the outer curve shape OLN has been described. Even if there is a certain island curve shape, it is possible to similarly create a pick feed passage. In addition, although the processing path is described as a group of parallel straight lines, for example, a pick feed path can be similarly created even with a group of curves obtained by similarly reducing the outer shape of the curve OLN.

[0018]

As described above, according to the area machining method of the present invention, even if there is a portion in which the tool moves downward in the pick feed passage, a partial passage which does not cause a cut in the bottom surface of the tool is formed. Since it can be created and the tool life can be improved by preventing the tool from being damaged, the safety in the machining process can be improved and the incidence of machining defects can be reduced. In addition, the present invention
Pick feed passage determined by the area processing method
Is set to the shortest distance to the next machining point,
It can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an area processing NC program creating unit of an automatic programming device for realizing an area processing method of the present invention.

FIG. 2 is a flowchart showing the flow of processing of the method of the present invention.

FIG. 3 is a flowchart showing the flow of processing of the method of the present invention.

FIG. 4 shows a first example of a tool path according to the method of the invention.

FIG. 5 shows a second example of a tool path according to the method of the invention.

FIG. 6 shows a third example of a tool path according to the method of the present invention.

FIG. 7 is a diagram showing a first example of a tool path according to a conventional method.

FIG. 8 is a view showing a second example of a tool passage according to a conventional method.

FIG. 9 is a view showing a third example of a tool path according to a conventional method.

FIG. 10 is a view showing a fourth example of a tool path according to a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing path parameter input means 2 Outline curve shape input means 3 Processing condition parameter input means 4 Processing path creation means 5 Pick feed path creation means 6 NC program conversion means 7 Data input / output means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G05B 19/4093 B23Q 15/00

Claims (2)

(57) [Claims] 1. A region machining method for machining a region inside a region surrounded by one or more contour curves by moving a tool with a plurality of machining passages, wherein a second machining passage is provided from an end point of the first machining passage. A pick-up passage for performing a tool movement to a start point of the first machining path, an ascending passage that moves upward by a predetermined amount from an end point of the first machining path, and a pick-up path near the start point of the second machining path. from quasi starting points on processed the machining path adjacent the second machining path and changing passage to move a predetermined amount above the position, the descending passage for downward movement to the associated start point on the processed working passage And a starting path for moving to a starting point of the second processing path, and sequentially performing the area processing. 2. The starting point of the second machining path and the machining
When the end points of the processed machining path are all on the outer shape curve, a first start path that moves from the quasi-start point to the end point on the processed machining path as a start path configuring the pick feed path; wherein from the end point of the processed working path to the starting point of the second machining path, according to claim 1 to perform the sequence determined by the area processing the second start passage to move along the contour curve Area processing method.