JPS62297001A - Automatic lathe - Google Patents

Abstract

PURPOSE:To reduce the size of a device and to improve the productivity, by a method wherein two main spindles are positioned facing each other, a fluctuation in a relative distance between the tool rest of an automatic lathe, the main spindles of which perform machining independently from each other, and the main spindle is reduced. CONSTITUTION:A workpiece 17 of a first main spindle 2 is primarily machined in a given shape by means of a tool 8 of a first tool rest 7. The workpiece 17, on which primary machining is applied, is moved to a second main spindle 13, and secondary machining is applied thereon by means of a tool 16 of a second tool rest 15. In movement of the workpiece 17 to the second main spindle 13, the tool rest 7 is moved in a direction in which it is separated away from the axis of the main spindle 2 along a guide passage 6, and subsequently, the second main spindle is moved in the direction of an axis along a guide passage 12. This constitution enables the first and second main spindles 2 and 13 to be positioned closer to each other, and enables reduction of the size of a device.

Description

[Detailed description of the invention] 3. Detailed theory of the invention 1 town [Industrial application field] The unexploded 1j1 has two main shafts arranged oppositely,
This invention relates to an automatic lathe that can perform machining independently with each main spindle.

[Prior Art] An automatic lathe having two main spindles arranged oppositely performs main processing such as turning, that is, primary processing, with one of the main spindles.
This is used when a workpiece that has undergone primary processing is subjected to secondary back or rear surface processing using the other spindle.

Conventionally, as such an automatic lathe, for example, Japanese Patent Application Laid-Open No. 60-23
The one shown in Japanese Patent No. 2802 is known. In this structure, the second spindle and the first and second tool rests are provided at a movable distance in the direction of the spindle center line of the first spindle and in the direction orthogonal to the spindle center line direction, respectively, with respect to the first spindle. It is being

Therefore, when machining is performed using this automatic lathe, the workpiece chucked on the first spindle is machined using the tool on the first tool rest,
The workpiece that has undergone primary machining on the first spindle is transferred to the second spindle and chucked, and secondary machining is performed on the back side of the workpiece chucked on the second spindle using a tool on the second tool post. It operates. Here, processing using the first spindle and the first turret,
Machining by the second spindle and the second tool rest is performed simultaneously and in parallel to reduce machining time.

By the way, in such an automatic lathe, the relative positional relationship between the first tool rest and the second spindle must be maintained so that they do not interfere with each other.

[Problem that the invention attempts to solve] In the conventional example, what are the first tool rest and the second main shaft?

Since each tool rest is simply provided so as to be movable independently in two directions: the direction of the spindle center line and the direction perpendicular thereto, in order to prevent interference between the first tool rest and the second spindle, The second spindle must perform secondary machining at a position optically separated from the first turret, and from the perspective of removing chips, the relative position of the first turret and second spindle must be If they come close to each other, there is a risk that the two chips will become entangled, so from this point of view as well, it is necessary to have the second spindle perform secondary machining at a position that is optically separated from the first tool rest. . As a result, the equipment becomes larger, and the amount of movement of the second spindle to transfer the workpiece from the first spindle to the 21st spindle increases, resulting in increased idle time and lower productivity. do not have.

An object of the present invention is to provide an automatic lathe that has little change in the relative distance between the first tool post and the second spindle, can be downsized, and has excellent productivity.

[Means for Solving Problem E] 1-The problem with the prior art is that the bed, the first spindle fixed to the bed and rotatably mounted on the first spindle, and the first spindle mounted on the bed. along the first guide path provided.
A first longitudinal feed table that moves in the direction of the center line of the spindle, and this:
a first tool rest provided on the JIJl longitudinal feed table and movable in a direction perpendicular to the center line of the first main spindle along a second guide path provided on one side of the center line of the first main spindle; 1st
It is installed on the longitudinal feed ↓- and is movable in the direction of the spindle center line and in the direction orthogonal to the spindle center line, and is opposite to the first spindle on the other side of the center line of the first spindle, and the center lines of both spindles are parallel. The second headstock is equipped with a second spindle arranged so as to rotate, and the
This problem can be solved by having a configuration including a second tool rest that is placed in a position that avoids the headstock and does not interfere with the main spindle stock.

[Function] Since the second main shaft and the second tool rest are provided on the first longitudinal feed stand on which the first tool rest is provided, the first tool rest is connected to the first tool rest.
When the first spindle moves along the guide path in the direction of the spindle center line of the first spindle, the second spindle and second tool rest also move in the same direction by the amount of movement.

Therefore, when machining is performed using the first spindle and the first tool rest, and the second spindle and the second tool rest, there is little change in the relative distance between the first tool rest and the second tool rest.

As long as the first spindle and the second spindle are offset to the extent that they do not interfere with each other, the 7JIJl, the second headstock, and the first and second tool rests can perform machining without fear of mutual interference. Therefore, the first main axis and the ':52 main axis can be arranged sufficiently close to each other.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. A first spindle stock 3 on which a first spindle 2 is rotatably mounted is fixed on the bed 1. In addition, a first guide path 4 is provided in the bed 1'2 in the direction of the center line of the main axis of the first main sleeve 2, facing the first main shaft 2.
A longitudinal feed base 5 is movably provided. A second guide path 6 is provided on the first longitudinal feed table 5 on the opposite side of the main spindle center line of the first main spindle 2 in a direction perpendicular to the main spindle center line direction. The first tool rest 7 moves l-1
In this embodiment, the first tool rest 7 is a turret tool with tools 8 arranged radially on the outside and in a manner that the tool 8 is located in the cutting area of the first spindle 2. It is a stand.

In addition, on the front side of the spindle center line of the first spindle 2 on the first longitudinal feed table 5, there is a third guide path lO in the direction of the spindle center line of the first spindle 2.
is provided, and a second longitudinal feed base 11 is provided movably along this third guide path lO. A fourth guide path 12 is provided on the second longitudinal feed table 11 in a direction perpendicular to the direction of the main axis center line of the first main spindle 2.
A second headstock 14 rotatably mounted thereon is provided movably along the fourth guide path 12 from a position coaxially opposing the first main spindle 2 to a position opposing a second tool rest 15 to be described later. It is being Further, a second tool rest 1 is placed on the first longitudinal feed 5 so as to avoid a position where the first main spindle 2 interferes with the first head stock 3 due to the movement of the first longitudinal feed 5, and to face the second main spindle 13.
5 is fixed.

Here, the first and second longitudinal feed tables 5, 11 . 1st turret 7. Movement control of the second headstock 14 is performed by an NC device (not shown) in the NC automatic lathe. Also: JS
The second tool rest 15 has a turret shape, and a plurality of tools 16 can be selectively used with respect to the second main shaft 13 by rotation indexing of the turret.
A tool holding means may be provided that allows the tool 16 of No. 5 to be moved in a direction perpendicular to the center line of the second main shaft 13.

Next, the effect will be explained. The workpiece 17 chucked on the first spindle 2 is moved in the direction of the spindle center line by the longitudinal feed base 5 of the tool 8 held on the first tool post 7 and moved in the orthogonal direction by the first spindle 7 to a predetermined position. A workpiece 18 that has undergone primary processing into its shape and is chucked on the second spindle 13
are both caused by movement of the second headstock 14 in the direction of the spindle center line and in a direction orthogonal to the tool 16 held on the second tool rest 15 provided on the first spindle 5. 2 is carried out independently. In this case, the movement of the first spindle 2 of the first tool rest 7 in the direction of the spindle center line is such that the first longitudinal feed stand 5 moves along the first guide path 4. This is done by being moved along the - Since the second main shaft 13 and the second tool rest 15 are provided on the first longitudinal feed stand 5, the amount of movement of the first upper shaft 2 of the first tool rest 7 in the direction of the main shaft center line as described above The second main shaft 13 and the second tool rest 15 also move in the same direction, so there is no change in the relative distance between the first tool rest 7 and the twenty-first shaft 13, and the second main shaft 13 moves in the same direction. 1
The only relative change is the amount by which the second longitudinal feed table 11 moves along the third guide path IO in order to process the second longitudinal feed plate 8, and this amount of movement is for secondary processing of the back surface. So generally negligible movement? It is. In this way, since there is little variation in the relative distance between the first tool rest 7 and the second main shaft 13, the second main shaft 13 can be moved by the movement of the first main shaft 5 even if the distance from the first tool rest 7 is small. If the second headstock 13 is offset toward the front so as not to interfere with the first headstock 3, there will be no interference between the two, and there will be no problem in removing chips.

When the workpiece 17 that has been chucked by the first king spindle 2 and has undergone primary processing is transferred to the second main spindle 13.

The first tool rest 7 moves along the second guide path 6 in a direction away from the main spindle center line of the first main spindle 2, and at the same time, the second main spindle 13 moves along the fourth guide path 12 along the L axis of the first main spindle 2. The second longitudinal feed table 11 moves in the direction of the center line until the center lines of both spindles coincide, and then the second longitudinal feed table 11 moves in the direction of the first spindle 2 along the third guide path 10, thereby directly transferring the workpiece. It will be done. In this case, as described above, the relative positional change between the first tool rest 7 and the second king shaft 13 is small, and the second main shaft 13 is not too far away from the first tool rest 7, that is, the first main shaft 2. Since there is no need to hold the workpiece in place, the amount of movement of the second main spindle 13 is small, speedy delivery is possible, idle time due to workpiece delivery can be shortened, and productivity is excellent.

FIG. 2 shows another embodiment of the present invention, in which a guide bushing base 21 having a guide bushing 20 is provided on the first longitudinal feed base 7 in front of the first main shaft 2. ,
The present invention can be applied in the same manner even when the guide bush 20 is provided.

[Effect of the invention] As is clear from the above explanation, according to the unissued IJI,
Since the second main shaft and the second tool rest are provided on the first longitudinal feed bar -1- where the first tool rest is provided.

When the first tool rest moves in the direction of the spindle center line of the first spindle along the first guide path, the second spindle and the second tool rest also move in the same direction by the amount of movement. Therefore, when machining is performed using the first spindle and the first tool rest, and the second spindle and the second tool rest, the relative distance between the first tool rest and the second spindle changes little, and the first spindle As long as the first and second spindles are offset to the extent that they do not interfere with each other, machining can be performed without the fear that the first and second headstocks and the first and second tool rests will interfere with each other. The main spindle and the second main spindle can be placed sufficiently close to each other, and there is little change in the relative position between the first tool rest and the second main spindle, making it possible to reduce the size and improve productivity. A lathe can be configured.・

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the invention, and FIG. 2 is a plan view showing another embodiment of the invention. l: bed, 2: first spindle, 3: first headstock, 5: first longitudinal feed, 7: first tool rest,
11: Second longitudinal feed base. 13: Second spindle, 14: Second headstock. 15: Second turret. Figure 1 7: 1st η table Figure 2

Claims (3)

[Claims] (1) A bed, a first headstock fixed on the bed and rotatably mounting a first spindle, and a direction along the center line of the first spindle along a first guide path provided on the bed. a first longitudinal feed that moves along a second guide path provided on the first longitudinal feed on one side of the center line of the first spindle and perpendicular to the center line of the first spindle; a first tool rest that moves in the direction of the spindle;
A second headstock rotatably mounted on the other side of the centerline of the first spindle, the second spindle facing the first spindle and arranged so that the centerlines of both spindles are parallel; 2nd on feed platform
An automatic lathe equipped with a second tool rest located in front of the main spindle at a position that avoids interference with the first head stock. (2) The automatic lathe according to claim 1, wherein the second tool rest has a turret shape, and a plurality of tools can be selectively used with respect to the second spindle by rotating and indexing the turret. (3) The automatic lathe according to claim 1, wherein the second tool rest is provided with a tool holding means that allows the second tool rest to move in a direction perpendicular to the center line of the second spindle.