JPH06246585A - Machining program preparing device for machine tool - Google Patents

Abstract

PURPOSE:To prepare an optimum machining program automatically by the cooperation of chuck pressure with cutting conditions. CONSTITUTION:In an NC lathe or the like provided with a chuck, machining data is inputted by a keyboard land displayed on a CRT 3 through an input control part 2 and also stored in an input data storage part 4. Machining processes, machining order, applied tools, and cutting conditions are determined on the basis of the stored data. A chuck condition determining part 9 determines the optimum chuck pressure on the basis of the cutting condition, and registers it into a machining program registering part 10 and also displays it on the CRT 3. A chuck condition input control part for inputting the chuck pressure may be provided to constitute in such a way as to determine the cutting condition by a cutting condition determining part on the basis of the chuck pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for creating a machining program in consideration of chuck pressure in a machine tool provided with a chuck such as an NC lathe.

[0002]

2. Description of the Related Art Conventionally, a technique as shown in FIG. 7 has been known as a machining program creating device for an NC lathe. Here, the processed data is input by the keyboard 31, displayed on the CRT 33 via the input control unit 32, and stored in the input data storage unit 34. Based on the stored data, the machining process determining unit 35 determines the machining process, the machining sequence determining unit 36 determines the machining sequence, and the tool determining unit 3 to be used.
The tool to be used is determined in 7, the cutting condition is determined in the cutting condition determination unit 38, and this cutting condition is registered in the machining program registration unit 39.

[0003]

However, since the conventional machining program creating apparatus does not consider the chuck pressure, it is necessary for the operator to set the chuck pressure on the basis of experience and intuition. It took time and effort. In addition, when the chuck pressure set in this way is used, the gripping force is insufficient and there is a risk that the workpiece will fly during processing. Every time, the chuck pressure had to be recalculated and reset. On the contrary, even in the case of machining with the chuck pressure kept constant, the cutting conditions were determined based on the experience and intuition of the operator. Therefore, also in this case, it is necessary to actually perform the processing to detect the optimum cutting conditions, which requires a considerable amount of labor and time.

Therefore, an object of the present invention is to provide an apparatus capable of automatically creating an optimum machining program by linking chuck pressure and cutting conditions.

[0005]

In order to solve the above problems, a machining program creating apparatus of the present invention is a machine tool having a chuck, and a cutting condition determining section for determining cutting conditions based on input data. A chuck condition determination unit that determines the optimum chuck pressure based on the cutting conditions and a display unit that displays the chuck pressure are provided.

The machining program creating apparatus of the present invention is, in a machine tool having a chuck, a chuck condition input control section for inputting a chuck pressure, a cutting condition determining section for determining a cutting condition based on the chuck pressure, and a cutting operation. And a display section for displaying the condition.

[0007]

According to the machining program creating apparatus of the present invention,
Since the optimum chuck pressure is automatically determined and displayed according to the cutting conditions, the work of setting and reviewing the chuck pressure is simplified. Further, since the optimum cutting condition is automatically determined and displayed according to the chuck pressure, the setting and review work of the cutting condition can be simplified.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment in which the present invention is embodied in an NC lathe will be described with reference to FIGS. As shown in FIG. 1, the machining program creating apparatus of the first embodiment has a keyboard 1, an input control unit 2, a CRT 3, an input data storage unit 4, a machining process determination unit 5, a machining sequence determination unit 6, and a tool determination unit used. 7, a cutting condition determination unit 8, a chuck condition determination unit 9, and a machining program registration unit 10. The chuck condition determination unit 9 determines the optimum chuck pressure based on the cutting conditions determined by the cutting condition determination unit 8, registers the optimum chuck pressure in the machining program registration unit 10, and displays it on the CRT 3.

As shown in FIG. 2, the chuck condition determining section 9 is provided with a grasping force calculating section 9a and a chuck data storing section 9b. The grasping force calculation unit 9a reads the maximum machining diameter d of the workpiece read from the program storage unit 15 of the NC device, the cutting amount t at the time of maximum diameter cutting, the feed amount f, and the specific cutting resistance K input by the keyboard 1. , Chuck chuck diameter D, chuck claw friction coefficient μ, cutting constant A (continuous cutting: 1.5, intermittent cutting: 3.0) The grasping force F of is calculated.

The chuck type, gripping force-set pressure diagram, and safety factor are registered in the chuck data storage section 9b. Then, the chuck data storage unit 9b, based on these chuck conditions, the rotation speed n at the time of maximum diameter cutting read from the program storage unit 15, and the grasping force F,
The optimum chuck pressure P is determined and displayed on the CRT 3. This series of operations is shown in the flow chart of FIG.

Therefore, according to the machining program creating apparatus of the first embodiment, the optimum chuck pressure P is automatically determined and displayed according to the cutting conditions, so that the chuck pressure P can be easily digitized and reviewed. Therefore, the effect of centrifugal force due to the rotation of the main shaft can be calculated without complicated calculations, and the chuck pressure data can be registered and stored and can be effectively used during reprocessing. Moreover, the set pressure varies depending on the operator. There is an advantage that it can contribute to stabilization of processing accuracy by eliminating the problem. In the above embodiment, d, t, f, n
Data is read from the program storage unit 15. This is a case where the chuck pressure P is determined before machining after the program is created.
It is also possible to determine the chuck pressure P based on the data of t, f, and n.

Next, a second embodiment in which the present invention is embodied in an NC lathe will be described with reference to FIGS. In the machining program creating apparatus of the second embodiment, as shown in FIG. 4, the data input by the keyboard 1 is stored in the input data storage unit 4 via the input control unit 2 and the chuck condition input control unit 11. . Then, the chuck condition input control unit 1
Based on the chuck pressure P (considering chuck conditions) input to 1, the cutting condition determination unit 8 determines the optimum cutting condition.

As shown in FIG. 5, in the cutting condition determining section 8, the chuck data storage section 8a includes a cutting amount calculating section 8b,
A cutting amount and feed amount determining unit 8c is provided. In the chuck data storage unit 8a, the chuck type, the grasping force-set pressure diagram, the safety factor registered therein, the rotation speed n at the maximum diameter cutting read from the program storage unit 15, and the keyboard 1 are input. Grasping force F based on chuck pressure P
Is calculated.

In the cutting amount calculation unit 8b, the grasping force F,
The maximum machining diameter d read from the program storage unit 15,
The cutting amount (t × f) is obtained based on the grasping diameter D, the friction coefficient μ, and the specific cutting resistance K input by the keyboard 1. Then, based on this cutting amount (t × f), the cutting amount and feed amount determination unit 8c determines the cutting amount t and the feed amount f under the restriction of the motor output and the rotation speed, and these cutting conditions CR
Display at T3. Therefore, it is possible to greatly simplify the setting and review work of cutting conditions as compared with the conventional method. 6. Note that FIG. 6 is a flowchart showing the series of operations described above.

[0015]

As described above in detail, according to the first aspect of the invention, the optimum chuck pressure is automatically determined and displayed according to the cutting conditions. It has an excellent effect that it can be simplified.

According to the second aspect of the present invention, since the optimum cutting conditions are automatically determined and displayed according to the chuck pressure, there is an effect that the setting and review work of the cutting conditions can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram of a machining program creation device showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing in detail a chuck condition determining unit of the apparatus shown in FIG.

FIG. 3 is a flowchart explaining the operation of the apparatus of FIG.

FIG. 4 is a block diagram of a machining program creating device showing a second embodiment of the present invention.

5 is a block diagram showing in detail a cutting condition determination unit of the apparatus of FIG.

6 is a flowchart explaining the operation of the apparatus of FIG.

FIG. 7 is a block diagram showing a conventional machining program creation device.

[Explanation of symbols]

1 ... keyboard, 2 ... input control unit, 3 ... CRT,
4 ... Input data storage unit, 5 ... Machining process determination unit, 6 ...
・ Machining order determination unit, 7 ・ ・ Tool used determination unit, 8 ・ ・ Cutting condition determination unit, 9 ・ ・ Chuck condition determination unit, 10 ・ ・ Machining program registration unit, 11 ・ ・ Chuck condition input control unit,
15 ... Program storage section.

Claims (2)

[Claims] 1. In a machine tool having a chuck, a cutting condition determining section for determining a cutting condition based on input data, a chuck condition determining section for determining an optimum chuck pressure based on the cutting condition, and a chuck pressure are displayed. A machining program creation device comprising a display unit. 2. A machine tool having a chuck, comprising a chuck condition input control unit for inputting a chuck pressure, a cutting condition determination unit for determining a cutting condition based on the chuck pressure, and a display unit for displaying the cutting condition. A machining program creation device characterized in that