JPH0379201A - Machine tool - Google Patents

Abstract

PURPOSE:To significantly improve machining efficiency in a lathe which is capable of machining with a main and a sub at the same time in a single machine by adding the sub tool rest of a short process machining on the sub headstock side to a long process machining on the main headstock side so as to reduce waiting time. CONSTITUTION:In the case that machining of a first process and a second process with the machining time of T1 and T2 (T1>T2) respectively is carried out with this lathe, when the machining of the second process is completed with a sub headstock (second headstock) 4 and a sub tool rest (second tool rest) 6, the first process with a main headstock (first headstock) 3 and a main tool rest (first tool rest) 5 has not completed yet. Accordingly, the sub tool rest 6 is moved to the main headstock 3 side to be added to machining of the first process. As a result, the first process is reduced by the amount of contribution by the sub tool rest 6, whereby reduces machining pitch and improves machining efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a machine tool, and is particularly concerned with shortening waiting time when machining the first and second processes are performed in parallel within the machine. This invention relates to improvements in machining procedures that can improve machining efficiency.

[Conventional technology]

For example, in recent lathes, a main headstock and a sub-headstock are arranged to face each other on the same machining axis, and the sub-headstock is movable in the direction of the machining axis, and the main tool rest is placed on one side of the machining axis. , and a sub-turret arranged in parallel. In this lathe, the workpiece (hereinafter referred to as the work) is machined in the first process using the main headstock and main tool post, and the workpiece after the first process is taken up by the sub-headstock, and then The sub-headstock and sub-turret perform the second process machining.Therefore, with this lathe, two machining processes can be performed consecutively and in parallel within one machine tool, reducing the workpiece transport time. Machining efficiency can be improved by eliminating unnecessary parts.

[Problem that the invention seeks to solve]

However, the conventional machine tools described above may not be able to contribute much to improving machining efficiency depending on the machining shape of the workpiece. That is, for example, if the machining time of the first process is longer than the machining time of the second process, the sub-headstock is
After finishing the machining process and transporting the workpiece out of the machine, it is necessary to wait until the machining of the first process on the main headstock is finished. In other words, the machining pitch cannot be made shorter than the machining time of the first step. Therefore, in order to further improve machining efficiency, it is required to shorten the above-mentioned waiting time.

The present invention has been made in response to the above-mentioned demands. It is an object of the present invention to provide a machine tool that can shorten the waiting time when there is a difference in machining time in the second step, and can significantly improve the overall machining efficiency.

[Means for solving problems]

In the present invention, a first headstock and a second headstock are arranged facing each other on the same machining axis, and at least one headstock is movable in the direction of the machining axis to the other headstock. A first tool rest is arranged on one side and a second tool rest is arranged on the other side. The second turret is attached to the first turret. It is possible to move between the second headstock in the direction of the machining axis, and also in a direction perpendicular to the machining axis, and in the first step, between the first headstock and the
In combination with the tool post, in the second process, the combination of the second headstock and the second tool post are respectively processed, and when either process is longer than the other process by a predetermined time or more, the machining on the long process side The present invention is characterized in that a machining control means is provided to add a turret on the short process side.

Here, the machining control means of the present invention can be easily realized by changing the machine program of a computer installed in a machine tool.

[Effect]

With the machine tool according to the present invention, the machining time is T1.
．． The first .T2 (TI>72). When performing the second process, when the second process using the second headstock and second tool post is completed, the first process using the first headstock and first turret has not finished yet. In such a case, in the conventional machine, the second headstock waits until the first process is completed, but in the present invention, the second headstock moves to the first headstock side and Added to one step of processing. Therefore, the first step is shortened by the contribution of the second tool post, and the machining pinch is also shortened accordingly, improving machining efficiency.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are schematic configuration diagrams for explaining a lathe according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a lathe in which the apparatus of this embodiment is employed, and a main spindle stock 3 is arranged and fixed on one end side of a bed 2 of the lathe 1. Further, on the other end side of the main headstock 3 on the machining axis A, a sub-headstock 4 is disposed so as to face the main headstock 3 and to be separated by a predetermined distance. The sub-headstock 4 is capable of reciprocating in the direction of the machining axis until its chuck 4a approaches the chuck 3a of the main headstock 3. The holder can be removed from the sub-headstock 4. Further, on one side of the processing axis A (upper side in Figure 1) is a main tool rest 5 equipped with a turret 5a, and on the other side (lower side in Figure 1) is a turret 6a.
Each sub-tool rest 6 is arranged. The main and sub tool rests 5.6 are movable by a distance in the direction of the machining axis A, and are also movable in a direction perpendicular to the machining axis A.

Next, the effects of this embodiment will be explained.

In the lathe 1 of this embodiment, the workpiece W is processed in the first step and then in the second step, but the first step processing time T1 is longer than the second step processing time T2 by a predetermined time or more. Let me explain the case.

First, the workpiece W1 supplied to the main headstock 3 of the lathe 1
is gripped by the chuck 3a, and while the main headstock 3 rotates the main tool post 5 cuts the selected bait with the turret 5a, the workpiece W1 is subjected to the first cutting process. When the machining of the first step is completed, the sub-headstock 4 advances toward the main headstock 3 and grips the workpiece W1 with its chuck 4a, and the gripping of the chuck 3a of the main headstock 3 is released.

Then, the sub-headstock 4 retreats to its original position and is fixed at a predetermined position, and while rotating the workpiece W1, the sub-tool rest 6 cuts the selected cutting tool with the turret 6a, thereby causing the workpiece W1 to undergo the second process. On the other hand, the next workpiece W2 is supplied to the main headstock 3 side at the same time as the sub-headstock 4 is retreated, and as shown in FIG. 4 and the sub-turret 6, the workpiece W2 is processed in the second process.
The first step of machining is performed on the main headstock 3 and the main tool rest 5.

Here, since the machining time TI in the first process is longer than the machining time T2 in the second process as described above, the workpiece W1 that has finished machining in the second process on the sub-headstock 4 side is transferred to the machine via the unillustrated unloading mechanism. When the workpiece W2 is carried out, the first process machining has not been completed. Therefore, in this embodiment, the sub-tool rest 6 advances to a predetermined position on the main headstock 3 side, and the tool rest 6 The selected cutting tool is cut into the workpiece W2 by the turret 6a, and as a result, as shown in FIG.

Machining using the sub-turret 5.6 is performed at the same time.

When the first process machining of the workpiece W2 is completed, the sub-headstock 4 picks up the workpiece W2 and performs the second process machining, and the next workpiece is supplied to the main headstock 3, which is then attached to the main spindle. Table 3 etc. perform the first process processing.

In this way, in this embodiment, the first process machining is performed on the main headstock 3 side and the second process machining is performed on the sub headstock 4 side in parallel, and when the second process machining is completed, the sub tool rest 6 is also performed. Since the first step machining is performed, the first step machining time is shortened by the contribution of this sub-turret 6 to the machining, and the feeding and discharging pitches of parts are shortened accordingly, improving machining efficiency.

In the above embodiments, the case where the first step machining time is longer than the second step machining time is explained as an example, but the present invention can of course be applied to the opposite case. Furthermore, although a lathe was used as an example in the above embodiments, the present invention can also be applied to machine tools other than lathes.
1st. It can be applied as long as the second step processing is performed in parallel.

〔Effect of the invention〕

As described above, according to the machine tool of the present invention, the first process machining is performed in parallel on the first headstock side and the second process machining is performed in parallel on the second headstock side, and the machining on the long process side is shortened. By adding a turret on the process side, waiting time can be shortened and machining efficiency can be significantly improved.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining a lathe according to an embodiment of the present invention, in which FIG. 1 is a plan view showing a schematic configuration thereof, and FIG. FIG. 6 is a plan view for explaining the respective operations. In the figure, 3 is the headstock (first headstock), 4 is the sub-headstock (second headstock), 5 is the main turret (first turret),
6 is a sub-turret (second turret), A is a machining axis, and W is a workpiece (worked object). Figure 1 (a) Figure 2 (b)

Claims (1)

[Claims] (1) A first headstock and a second headstock are arranged facing each other on the same machining axis, and at least one headstock is movable in the direction of the machining axis to the other headstock, and the machining axis is sandwiched between the two headstocks. A first tool rest is arranged on one side and a second tool rest is arranged on the other side, and the first and second tool rests are movable in the direction of the machining axis between the first and second headstocks, It is also movable in the direction perpendicular to the machining axis, and in the first step, the first headstock and the first tool rest are combined, and in the second step, the second headstock and the second tool rest are used in combination. and when one of the processes is longer than the other by a predetermined time or more, the machine tool is provided with a machining control means that adds a short-stroke side tool rest to the long-stroke side machining. .