JPS6114801A - Fixed cycle method of combined shape in numerically controlled lathe - Google Patents

Abstract

PURPOSE:To eliminate the necessity for restricting a number of hollows, which can be cut in the same fixed cycle, by performing the positioning of a machining route, from the machining finish point of one hollow to the next machining start point, to be quickly fed in an X-axis and a Z-axis direction. CONSTITUTION:If a microcomputer is given a combined fixed cycle instruction, a lathe advances its machining by successively calculating a route P1-P33 through arithmetic operation. And the lathe performs cutting first along the route P1 by calculating it next along the route P2 by calculating it. Next, the lathe advances its cutting to a point (i) along the route P3 by obtaining it, resetting the machining to be quickly fed to the final point of the route P1. Hereafter, the lathe similarly performs cutting along the route P6-P8, resetting the machining along the route (P9-P11) to be quickly fed to the final point of the route P6. And a hollow is machined along the route P12-P19. Subsequently, the lathe similarly performs cutting along the route P20-P30, completing the machining.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to complex canned cycle commands in numerically controlled lathes.

Conventional technology-combined canned cycles automatically calculate the tool path along the way and perform machining simply by specifying the product shape. When making a shaped product on a lathe, the tool path P1 to
P33 (here, the number next to P indicates the order of the path, cutting feed is shown as a solid line, and rapid feed is shown as a dotted line) is calculated by internal processing, and the rough cutting operation is automatically performed. I can make you do it.

071P・IQ9 D5. OFMO, -(1)N I
GOI; -(2) GOIX
b Zb ; −(3) GOIXc
Zc ; , -(4) GOIXd Z
d, -(5) GOIXe Ze
;-(6) GOIXf Zf,
-(7) GOIXg zg,
-(8)GO]Xh Zh;
-(9) GO] Xi Zi;
--(10)N9;
-(11) Here, (1
) is a fixed cycle command that instructs a rough cutting operation to cut out the shape specified in the product shape program block sandwiched by N1 and N9 with a single cutting depth of 5 mm, and Xb-Xi is the X axis at point bxi in Figure 2. The coordinate value Z b =Z i is the X-axis coordinate value of point b - i in FIG. 2, and the machining start point is point a.

The example in Fig. 2 is for a product with two depressions, and the machining of the depression on the side closer to the machining start point is completed up to path P]9, and then the next machining start point is completed in paths P20 to P22. The next recess after path P23 is machined.

By the way, the position where the machining of the first depression is completed (path P
19 (end point) to the next machining start point (start point of path P23)
Conventionally, in order to position the path P2, the process shown in FIG.
X at the starting point (boundary point) of 3.

The Z absolute coordinate value and the program information of the path P23 are stored in the memory, and when the recess machining is completed, the X coordinate value and the X coordinate value of the boundary point stored in the memory are stored as shown in the flowchart of Fig. 4. The rough cutting operation is continued by determining the next moving route from the stored program information. For this reason, the fifth
As shown in the figure, as the number of recesses increases, the amount of boundary points and program information to be stored also increases accordingly, and in systems with limited memory capacity, the number of recesses that can be cut in the same canned cycle is limited. There was a problem that

Problems to be Solved by the Invention The present invention improves the problems of the conventional art, and its purpose is to perform the next machining process from the point at which the machining of the recess is completed without having to memorize the boundary points and program information. The object of the present invention is to provide a method that allows positioning to a starting point. 'Means for Solving the Problems In order to solve the above problems, the present invention is based on a product shape program consisting of a plurality of processors and the amount of cut per cut, in order from the depression near the machining start point. In the compound canned cycle method for numerically controlled lathes, which advances machining while calculating the machining path so that the machining is completed, positioning from the completion point of one indentation to the start point of the next machining is performed using a product shape that is not monotonically increasing. After rapidly moving the amount of movement in the X-axis direction specified in the product shape program block until the program block appears, X of the starting point of the non-monotonically increasing product shape program block that appears
This is done by fast forwarding to the axis coordinate value.

A detailed description of the present invention will be given with reference to FIG. 2. Path P]
When cutting is completed to the end point 9 and the machining of the first recess is completed, rapid traverse is performed parallel to the X-axis to the X-axis coordinate value of the end point of the product shape program block (block (5) above) that includes the machining completion point. (refer to path P20 for movement), then reads the next product shape program block (block (6) above) and determines whether or not this block is a movement command that increases monotonically in the X-axis direction. In the case of Fig. 2, since it is a monotonically increasing block, it is necessary to rapidly move parallel to the X-axis to the X-axis coordinate value of the end point of the block. ) and perform the same determination. Since the block in (7) is not a block that increases monotonically in the X-axis direction, the starting point of this block is recognized as a boundary point, and the block is fast-traveled parallel to the Z-axis to the X-axis coordinate value of the starting point of this block (see path P22), Position to the next machining start point.

Embodiment FIG. 6 is a block diagram of the main parts of a numerically controlled lathe that implements the method of the present invention, in which 1 is a microcomputer, which is interconnected with peripheral circuits via a bus 2 including a data bus, an address bus, and a control bus. has been done. The NG command program is given in the form of a command tape 3 or in the form of an external force sent memory 4, and in the case of a command tape, it is read by a tape reader 5. Complex fixed cycle commands are included in the command program. The microcomputer 1 decodes the command program, performs necessary calculations, and provides the operating information obtained to the X-axis position control circuit 6, Z-axis position control circuit 7, and spindle control circuit 8. Shaft motor 10. Controls the movement of the main shaft motor 11.

The workpiece is mounted on the headstock and rotated by the main shaft, and the tool is moved by an X-axis motor and a two-axis motor. In addition, in FIG. 6, 12 is a ROM, and 13 is a RAM.
, 14 is a keyboard.

The operation of this embodiment will be explained with reference to FIG.

The microcomputer 1 has the above (1) to (II) (7).
When a complex fixed number cycle command is given, the paths P1 to P33 are sequentially calculated by calculation to proceed with machining.

Immediately, the microcomputer 1 first calculates the intersection of the block (3) and the cutting line at a depth of 51II11 from the machining start point a to calculate the path P1, performs cutting along the path P1, and then Path P2 is calculated by finding the point where a straight line passing through the end point of P1 and parallel to the Z axis intersects with the product shape, and cutting is performed along the path P2. Next, a path P3 is found from the block (10) including the end point of the path P2, cutting is performed to one point along the path P3, and the process returns to the end point of the path P1 by rapid traverse (paths P4, P5). This return is the path pi
This is done each time the end point of . is stored in the RAM 13. Thereafter, cutting is performed in the same manner along paths P6 to P8, and when the end point of path P8 is reached, the end point of path P8 is It is determined that it is the end point of one depression, and the path returns to the end point of path P6 by fast forwarding (paths P9 to P11). and route P12 to P]
The recess is machined according to step 9.

When the machining has been performed to the end point of the path P19, it is determined that the machining of the recess has been completed by returning to the previous machining path P]4.

Figure 1 is a flowchart showing an example of processing when moving the tool from the completion point of machining a recess to the start point of the next machining in rapid traverse.When machining of a recess is completed, one block of the product shape program is read (this Case block (5)
), it is determined whether the block is a block that monotonically increases in the X-axis direction.

If the block is monotonically increasing in the X-axis direction, the tool is moved in rapid traverse parallel to the X-axis to the X-axis coordinate value of the end point of the block. This causes the tool to move along path P20. Then, one block of the product shape program is read again (block (6) in this case), and the same determination as above is made to rapidly advance the tool along the path P21. Next, one block of the product shape program is read again (block (7) in this case), but since this block is a block that does not monotonically increase in the X-axis direction, the starting point of the read block is the boundary point. is determined, and the block is fast-forwarded in parallel to the Z-axis to the X-axis coordinate value of the starting point of the block.

As a result, the tool moves along the path P22 and is positioned at point e, which is the next machining start point. When the microcomputer 1 returns to point e, it executes subsequent path calculations, etc. based on the read product shape program (block (7) in this case), and proceeds with machining the next recess.

As described in detail, according to the present invention, the machining path is set so that machining is completed sequentially from the recesses closest to the machining start point, based on the product shape program consisting of a plurality of blocks and the depth of cut per cut. In the compound canned cycle method for numerically controlled lathes, which performs machining while calculating X specified in program block
After moving the amount of axial movement by rapid traverse, this is done by rapidly traversing to the X-axis coordinate value of the starting point of the non-monotonically increasing product shape program block that has appeared.
It is no longer necessary to store the boundary point that is the boundary between machining of one recess and another recess, and the program information to be executed after reaching the boundary point, as in the past. Therefore, there is an advantage that a complex fixed cycle having a plurality of recesses can be realized with a small memory capacity.

[Brief explanation of the drawing]

Fig. 1 is a flowchart showing an example of the process according to the method of the present invention when moving the tool from the completion point of machining a recess to the next machining start point in rapid traverse, and Fig. 2 shows an example of the machining path of a compound canned cycle. 3 and 4 are explanatory diagrams of the conventional method, FIG. 5 is a sectional view of a product shape with many depressions, and FIG. 6 is a block diagram of the main parts of a system implementing the method of the present invention. . P1 to P33 are processing paths, 1 is a microcomputer,
2 is the lotus, 3 is the command tape, 4 is the external keypad memory, 6 is the tape league, 6 is the X-axis position control circuit, 7 is the Z
The shaft position control circuit 8 is a main shaft control circuit.

Claims (1)

[Claims] A complex canned cycle for numerically controlled lathes that calculates the machining path so that machining is completed sequentially from the recess near the machining start point based on the product shape program consisting of multiple blocks and the depth of cut per cut. In this method, the positioning from the machining completion point of one recess to the next machining start point is performed by rapidly moving the X-axis direction movement amount specified in the product shape program block until a product shape program block that is not monotonically increasing appears. After that,
A compound fixed cycle method for a numerically controlled lathe, characterized in that the method is carried out by rapidly forwarding to the Z-axis coordinate value of the starting point of the non-monotonically increasing product shape program block that has appeared.