JPH07178645A - Machining program making method for opposed spindle lathe - Google Patents

Abstract

PURPOSE:To make a simple and efficient machining program by eliminating unbalance of a machining time in both spindles. CONSTITUTION:Based on a machining data, a machining time of both tool rests is calculated to compare a differential machining time with a permissible value (S1 to S4). When the machining time difference is larger than the permissible value, from the machining data of the tool rest of longer machining time, a process capable of simultaneous machining or a process capable of balance machining is referred (S5, S6, S8, S10). A machining program of both spindles is created by including simultaneous machining or balance machining (S7, S9, S11). The machining program is repeatedly checked (S12 to S14), and in the point of time obtaining the machining time difference in the permissible value or less, the machining program is stored (S15).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically processes a machining program in an opposed spindle lathe equipped with a pair of spindles opposed to each other and a pair of tool rests capable of machining a workpiece in cooperation with both spindles. It is about how to create.

[0002]

2. Description of the Related Art Conventionally, an opposed spindle type NC lathe is known in which a pair of spindles are arranged to face each other on a common machine frame, and a pair of tool rests are installed above and below the spindle axis. According to this, the front and back of the workpiece can be simultaneously processed by one lathe, and the processing efficiency is dramatically improved.

FIG. 3 shows an example of an opposing main spindle lathe of this type, which comprises a left main spindle 1, a right main spindle 2, a lower turret 3, and an upper turret 4. The tool rests 3 and 4 can work with the left and right spindles 1 and 2 in cooperation with each other.

For example, in the case of a work which requires both front and back surface processing, the work is chucked on the left spindle 1 in the first step, and the surface thereof is processed by a tool attached to the lower tool rest 3. Second
In the process, the work is chucked on the right main spindle 2 and the back surface is processed by a tool attached to the upper tool rest 4. The first step and the second step are carried out at the same time, and the longer one of the two steps determines the cycle time.

However, for a general work, the processing time of each process is often unbalanced. For example, when cutting the work W from the material M shown in FIG. 4, in the first step shown in FIG. 5, the left side spindle 1 has an end face A1 on the front side and an outer diameter A.
2, and the inner diameter A3 is processed by the lower tool post, and in the second step shown in FIG. 6, the back end face B1 and the outer diameter B2 of the right main spindle 2 are processed by the upper tool post.

At this time, as shown in FIG. 7 (A), an unbalance of ΔT occurs in the processing time of the upper and lower turrets,
The machining time of the lower turret, that is, the cycle time becomes considerably long. Therefore, the waiting time of the upper tool post, which has finished the machining earlier, becomes longer, and the machining efficiency deteriorates. In such a case, a process rearrangement work is usually required, and therefore a programmer who is familiar with the processing contents spends a great deal of time and labor.

Therefore, conventionally, there has been proposed a technique for automatically eliminating the imbalance of machining time on both spindles. For example, in Japanese Laid-Open Patent Publication No. 63-169251, in an opposed spindle lathe in which dedicated tool rests are installed on the left and right spindles, programming is performed by allocating a part of the machining process of the spindle having the longer machining time to the other spindle. A method of doing so is disclosed. Further, in Japanese Patent Laid-Open No. 4-69131, in addition to a dedicated tool rest for both spindles, a third tool rest capable of moving to both spindles is installed, and this third tool rest has a longer machining time. , An opposed spindle lathe configured for assisted machining with the spindle is disclosed.

[0008]

However, according to the former programming method, for example, the portion to be chucked in the second step must be preprocessed in the first step, or the roughing and finishing processes must be performed. Since the processes that can be distributed are limited, such as being unable to carry out in reverse order, and in addition, each tool post can be machined only by its dedicated spindle, and as a result, it was not possible to expect so much efficiency UP. Further, the latter opposed spindle lathe requires the installation of three turrets, which not only increases the machine cost but also complicates the entire machining program.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method capable of eliminating an imbalance in machining time and creating a simple and efficient machining program in an opposed spindle lathe equipped with a pair of tool rests. .

[0010]

In order to solve the above-mentioned problems, a machining program creating method of the present invention comprises a pair of spindles facing each other and a pair of spindles capable of machining a work in cooperation with both spindles. In an opposed spindle lathe equipped with a turret, a step of calculating the machining time of both turrets based on the machining data, a step of comparing the machining time difference with an allowable value, and a machining time when the machining time difference is larger than the allowable value. Repeat the above operations by searching the machining data of the longer tool post for a process that can be simultaneously processed or a process that can be balanced, and creating a machining program for both spindles including simultaneous or balanced machining. When the machining time difference is below the allowable value, the machining program is stored.

[0011]

According to the above method, when an imbalance exceeding the allowable value occurs in the machining time, a machining program including simultaneous machining or balance machining is created. Then, this program is checked again, and by repeating this, the imbalance of the machining time on both spindles is eliminated, and the most efficient machining program is automatically created.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The facing spindle lathe of this embodiment is shown in FIG.
As shown in FIG. 1, the left spindle 1, the right spindle 2, the lower turret 3, and the upper turret 4 are provided, and each turret 3, 4 cooperates with both the left and right spindles 1, 2 to work. It is configured so that it can be processed.

The machining program creation device for the facing spindle lathe is constructed as shown in FIG. Input control unit 1
1 inputs various processing data such as cutting conditions, material shape, used spindle classification, used turret classification, used tool, and cutting order. The processing time calculation unit 12 calculates the processing time for each of the tool rests 3 and 4 based on the input processing data. The machining time comparison unit 13 compares the machining times of the turrets 3 and 4,
The presence or absence of imbalance is determined by comparing the time difference with an allowable value that is a parameter.

When the processing time imbalance is determined, the excess process simultaneous processing determination unit 14 has exceeded the process in the tool rest having the longer processing time, that is, the process in which the other tool rest is in a waiting state, For example, in the step of processing the inner diameter A3 in FIG. 5, whether or not simultaneous processing is possible is determined based on the processing pattern. Here, the simultaneous machining means that two tool rests simultaneously perform different steps on the same main spindle, and for details, see JP-A-60-294633. When the excess processes can be simultaneously machined, the excess process simultaneous machining combination unit 15 combines the processes with the machining data of the tool post having a shorter machining time to create machining programs for both spindles.

The initial process simultaneous machining determination unit 16 is for the initial process in the tool rest having a longer machining time, for example, the process for machining the end surface A1 and the outer diameter A2 in FIG. 5, when the excess processes cannot be simultaneously machined. Determine whether or not simultaneous processing is possible. When the initial processes can be simultaneously machined, the initial process simultaneous machining combination unit 17 combines the processes with the machining data of the tool rest having a shorter machining time to create machining programs for both spindles.

When the initial processes cannot be simultaneously processed, the balance machining determination unit 18 determines whether or not the balance machining can be performed for the initial process on the tool rest having a longer machining time. Here, the term "balanced machining" means that two turrets share the same process at the same time with the same spindle, and the details are referred to the above-mentioned publication. The balance machining setting unit 19 sets the balance machining data in the machining data of both turrets and creates a machining program of both spindles when the initial process is capable of performing balance machining. The data output unit 20 outputs and saves a machining program including simultaneous machining and balance machining whose machining time difference is equal to or less than an allowable value to a storage medium such as a floppy or tape.

In the above structure, a method of creating a machining program for the work W shown in FIG. 4 will be described below with reference to the flowchart of FIG. 2 and the process chart of FIG. First, in step S1, various processing data such as cutting conditions and material shape are input. Next, in step S2, the machining time is calculated for each of the tool rests 3 and 4 based on the machining data, and in step S3, the machining time difference ΔT is calculated.

Next, in step S4, it is determined whether or not the processing time imbalance, that is, the processing time difference ΔT is equal to or more than the allowable value.
Then, the processing data of the lower turret 3 having the longer processing time is retrieved. Subsequently, in step S6, it is determined whether or not simultaneous machining is possible with respect to the excess process in the lower tool rest 3, that is, the machining process with the inner diameter A3. If simultaneous machining is possible, the machining process with the inner diameter A3 is performed in step S7. A machining program for both spindles 1 and 2 is created in combination with the machining data of the table 2.

If there is only one inner diameter machining step as shown in the drawing, it is impossible to simultaneously machine the inner diameter A3.
Next, in step S8, the initial process in the lower tool rest 3,
In other words, the first end face A1 from the single processing step
Whether or not simultaneous machining is possible is determined for the second outer diameter A2 process. Here, since the machining of the end surface A1 by the lower turret 3 and the machining of the outer diameter A2 by the upper turret 4 can be performed at the same time, the machining process of the outer diameter A2 is performed by the machining data of the upper turret 4 in step S9. 7B, as shown in FIG. 7B, the machining program for the upper tool rest 4 is set again in the order of the outer diameter A2 on the left spindle 1, the end face B1 and the outer diameter B2 on the right spindle 2, Processing programs 1 and 2 are created.

If it is impossible to perform simultaneous machining in both the excess process and the initial process, in step S10, the lower tool rest 3 is used.
If it is determined whether or not the balance processing is possible for the initial process of step S1 and the balance processing of the end surface A1 is possible, step S11 is performed.
Then, the balance machining data is set in the machining data of both turrets 3 and 4, and the machining programs of both spindles 1 and 2 are created.

When the machining program is created in step S7, step S9, or step S11, subsequently, in step S12, the machining time is calculated for each tool post 3, 4 based on the machining program, and step S13 is executed. so,
The machining time difference ΔT is calculated, and in step S14, it is determined again whether the machining time difference ΔT is equal to or more than the allowable value. If the machining time difference ΔT is still equal to or more than the allowable value, the process returns to step S8, and the next independent machining step that can be simultaneously machined is searched again from the initial steps. Then, when the processing time difference ΔT becomes equal to or less than the allowable value, the final processing program is stored in a storage medium such as a floppy or tape in step S15.

Therefore, according to the method of the present embodiment, by repeatedly checking the machining time difference, as shown in FIG.
As shown in (B), it is possible to reduce the imbalance of the machining time on both spindles 1 and 2 from ΔT to ΔT ', and also save the cycle time by T hours, thus providing the most efficient ideal machining program. Can be created automatically.

FIG. 8 shows another example of the machining program creating method. Here, in the flowchart of FIG.
In step S6, it is determined that the excess processes in the lower tool rest 3, that is, the machining processes of the outer diameter finish A4 and the inner diameter finish A5 can be simultaneously processed, and in step S7, the inner diameter finish A
The machining process of 5 is combined with the machining data of the upper tool rest 2 to create a machining program for both the spindles 1 and 2.

The present invention is not limited to the above-described embodiments, and the shapes and configurations of the respective parts can be appropriately modified and embodied without departing from the spirit of the present invention.

[0025]

As described in detail above, according to the present invention, in an opposed spindle lathe equipped with a pair of tool rests, when the machining time difference is larger than the allowable value, machining of the tool rest having a longer machining time is performed. Since the method of searching the process that can be simultaneously processed or the process that can be processed by balance from the data and creating the processing program for both spindles is adopted, the unbalance of the processing time is eliminated, and a simple and efficient processing program It has an excellent effect that can be created.

[Brief description of drawings]

FIG. 1 is a block diagram of a machining program creating device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a machining program creating method by the apparatus of FIG.

FIG. 3 is a schematic view of an opposed spindle lathe.

FIG. 4 is a cross-sectional view showing a processed shape of a work.

FIG. 5 is an explanatory view showing a processed portion on the left spindle.

FIG. 6 is an explanatory view showing a processed portion on the right spindle.

FIG. 7 is a process diagram illustrating a method for creating a machining program for the workpiece shown in FIG. 4;

FIG. 8 is a process chart showing another example of the machining program creating method.

[Explanation of symbols]

1 ... left spindle, 2 ... right spindle, 3 ... lower turret, 4 ...
Upper tool post, 11 ... Input control unit, 12 ... Machining time calculation unit, 13 ... Machining time comparison unit, 14 ... Excessive process simultaneous machining determination unit, 15 ... Excessive process simultaneous machining combination unit, 16 ...
・ Initial process simultaneous machining determination unit, 17 ・ ・ Initial process simultaneous machining combination unit, 18 ・ ・ Balance machining determination unit, 19 ・ ・ Balance machining setting unit, 20 ・ ・ Data output unit, M ・ ・ Material,
W ... work.

Claims (1)

[Claims] 1. An opposed spindle lathe comprising a pair of opposed spindles and a pair of tool rests capable of working a workpiece in cooperation with both spindles, wherein both tool rests are machined based on machining data. The step of calculating the time, the step of comparing the machining time difference with the allowable value, and the step that can be simultaneously machined or the balanced process can be performed from the machining data of the tool post with the longer machining time when the machining time difference is larger than the allowable value. The stage of searching,
Machining characterized by the steps of creating a machining program for both spindles including simultaneous machining or balanced machining, and saving the machining program when the machining time difference falls below an allowable value by repeating the above operation. How to create a program.