JPH0375886B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a numerical control device that controls a machine tool, such as a lathe, based on instructions from a machining program.

[Prior art]

Conventionally, there has been a device having this type of function as shown in FIG.

In this figure, 1 is a parameter, for example, the amount of tool pulling at the end of each cutting stroke. 2
3 is a tool cutting amount command in this machining process; 3 is a machining shape command; 4 is a tool movement path determining means that receives the parameters 1, the tool depth of cut command 2, and the machining shape command 3; and 5 is the tool movement path determination device. This is the control command that is the output of the means 4.

In addition, Fig. 2 shows the moving path of the tool used in the conventional device shown in Fig. 1, where d is the depth of cut of the tool, and S
are the starting and ending points of the tool, 11 is the machining shape, 12 is the finishing margin dimension, k is the finishing margin, and 13 is the moving path of the tool.

Next, the operation will be explained. When the numerical controller receives a complex fixed cycle command, each parameter 1
and the rough cutting tool depth command 2 included in the command, and the machining shape command 3 specified in the command.
A tool movement path 13 is calculated by the tool movement path determination means 4 using , and is outputted as a control command 5 to the control circuit. By repeating this operation, the tool movement path 13 shown in FIG. 2 is obtained.

Conventional numerical control devices with multiple canned cycle functions are configured as described above, and while the above functions are being executed, continuous cutting with the same depth of cut is performed, resulting in wear on the tool edge concentrating on one point. There were flaws.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing a depth of cut determining means for adjusting the depth of cut of the tool for each cutting stroke during execution of a compound canned cycle. , provides a numerical control device that performs a compound canned cycle while distributing wear on the tool cutting edge.

[Embodiments of the invention]

FIG. 3 is a block diagram showing an embodiment of the present invention, and numerals 1 to 5 are the same as those shown in FIG. 6 is a depth of cut change width command which instructs the width of change in the depth of cut of the tool. Reference numeral 7 denotes a tool depth of cut determining means which receives the depth of cut change width command 6 and the tool depth of cut command 2 as input.

Also, Fig. 4 is a movement path diagram of the tool used in the embodiment shown in Fig. 3, where 11 to 13 indicate the same things as in Fig. 2, D is the basic tool depth of cut, and Δd is the width of change in the depth of cut. In Fig. 4, Δd,
The case where the values are changed as 2Δd, 3Δd, etc. is shown.

Next, the operation will be explained. As in the past, when the numerical control device receives a compound fixed cycle command, it calculates one stroke from the tool cutting amount command 2 for rough cutting included in the command and the cutting amount change width n × Δd (n is the number of cuts and is an integer). Tool depth of cut D−n×
Determine Δd. Next, each parameter 1, machining shape command 3 and tool depth of cut D- specified in the command
The tool movement path is calculated by the tool movement path determining means 4 using n×Δd, and is outputted as a control command 5 to the control circuit. By repeating this operation, a tool movement path 13 shown in FIG. 4 is obtained. In Fig. 4, the depth of cut change width Δd is subtracted from the initial tool depth of cut D until the minimum allowable depth of cut (D-4Δd in this example) is reached, and after that, the initial depth of cut command value D
The depth of cut change width Δd is added until reaching .

Further, in the above embodiment, the case of the composite fixed cycle function has been described, but it may be performed during all machining programs that perform automatic operation of the numerical control device, and the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, this invention is provided with a depth of cut determination means that determines the depth of cut of the tool according to the depth of cut change width command for each cutting stroke of the required stroke, so that wear on the tool cutting edge is not concentrated at one point. This has the advantage of extending the life of the cutting edge.

[Brief explanation of drawings]

Fig. 1 is a control block diagram showing a conventional compound canned cycle, Fig. 2 is a conventional tool path diagram, Fig. 3 is a configuration block diagram showing an embodiment of the present invention, and Fig. 4 is a control block diagram showing a conventional compound fixed cycle.
The figure is a tool path diagram according to an embodiment of the invention. In the figure, 1 is a parameter, 2 is a tool depth of cut command, 3 is a machining shape command, 4 is a tool movement path determining means, 5 is a control command, 6 is a depth of cut change width command, 7
11 is a processing shape, 12 is a finishing margin dimension, and 13 is a moving path of a tool.

Claims (1)

[Claims] 1 In a numerical control device that controls a machine tool according to commands from a machining program, a new tool depth of cut is determined by adding or subtracting the depth of cut change range obtained from the number of cuts and the depth of cut change width command to the tool depth of cut command. A numerical control device comprising: a depth of cut determining means for determining the depth of cut; and a part of the tool in contact with the workpiece is moved for each cutting stroke.