JPH048401A - Biaxial lathe - Google Patents

Abstract

PURPOSE:To replace work at one spindle while processing is carried out at the other spindle, so as to obtain high productivity with a simple structure by providing a tool turret between two spindles, and by transmitting power to both of the spindles with clutch exchange from one motor. CONSTITUTION:When processing is carried out on a spindle 4, the rotation of a motor 18 is transmitted to the spindle 4 with a pulley 19 of a clutch 22 engaged and a pulley 20 disengaged, and a tool turret 6 is moved to the left, and processing is carried out by a tool 9. A non-processed work is held by a loader 12 in a downward loader chuck 17 of a loader head 16, while processing is carried out by the spindle 4, and a processed work of a spindle 5 is received by a forward loader chuck 17, so as to replace the processed work, and to transmit the non-processed work to the spindle 5. When the processing is finished at the spindle 4, the clutch 22 is changed over to the spindle 5, and the tool turret 6 is moved to the right, so as to process the work prepared at the spindle 5. The cycle time of the work is improved thereby compared to a oase of a monoaxial lathe.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a turret type two-axis lathe.

[Conventional technology]

Conventionally, as shown in FIG. 4, there is a turret-type two-spindle lathe in which two main spindles 51, 52 are placed adjacent to each other in the center, and a tool turret 53, 54 is placed on the image side.

Each spindle 51, 52 has its own spindle motor (not shown).
It is attached to a belt. A gantry-type loader 56 that runs along a rail 55 is provided above the spindle 51.52, and a workpiece supply station (not shown) provided on one side of the lathe supplies the workpiece to each spindle 51.52. The funnel and unloading to the product unloading station installed on the other side are automatically performed.

According to this configuration, since two main spindles 51.52 and two tool turrets 53.54 are provided, high productivity can be obtained. Moreover, only one loader 56 has both main shafts 51.
Can be used for both 52 and 52.

One loader 56 is used for both main spindles 51.52, so while machining is being performed on one of the main spindles 51.52, the workpiece exchange, that is, unloading and funneling, for the other main spindle 51.52 is performed. conduct.

[Problem to be solved by the invention]

However, when machining a large number of workpieces with a short actual machining time in succession, the workpiece exchange time by the loader 56 accounts for a large proportion of the cycle time, and the operating rate of the tool turret 53, 54 and the spindle motor of the spindle 5152 decreases. low. In particular, if the actual machining time is shorter than the workpiece exchange time, while machining is being performed with one of the spindles 51 and 52,
The workpiece exchange of the other spindle 51, 52 cannot be completed, and either one of the tool turrets 53, 54 and the spindle motor of one spindle 51, 52 are always idle.

Therefore, although it is equipped with two main spindles 51, 52 and two tool turrets 53, 54, it is not possible to operate them sufficiently, and this results in poor productivity and poor lathe costs and occupied floor space. .

In particular, the tool turrets 53 and 54 are expensive because they are precision assemblies equipped with an indexing mechanism and a forward/backward drive mechanism, and each spindle motor of each spindle 51 and 52 is also high-output and therefore costly. is high. In the case of a workpiece for which the actual machining time is short as described above, the operation rate of the expensive tool turrets 53, 54 and the spindle motor is low, making it extremely uneconomical.

The purpose of this invention is to
To provide a two-spindle lathe that can simplify the structure and reduce the occupied floor space without reducing productivity compared to a two-spindle, two-turret lathe.

[Means to solve the problem]

The two-spindle lathe of the present invention has one tool turret between two main spindles, and both main spindles are driven by one main-spindle motor whose power transmission is switched by a clutch. The tool turret is movable in the spindle alignment direction.

[For production]

According to this configuration, while machining is being performed with one spindle, the workpiece can be funneled and unloaded onto the other spindle. The tool turret can be used for both spindles by moving it in the alignment direction of the spindles. Furthermore, the main shaft motor can be used for both main shafts by switching the clutch.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2.

A pair of headstocks 2.3 are provided at both left and right ends of the head 1, and two spindles 4.3 are provided with open/close claw type spindle chucks 4a, 5a.
5 is installed on each headstock 2 and 3, respectively. A turret slide 7 on which a tool turret 6 is mounted is installed between both headstocks 2 and 3 on the bed 1 so as to be movable along a rail 8 in the direction in which the spindles are lined up. The tool turret 6 has a polygonal tram-like front shape, and various tools 9 such as a cutting tool and a rotary tool are attached to each peripheral surface portion. Further, the tool turret 6 is supported by a turret slide 7 so as to be movable in the axial direction and rotatable for indexing.

Above the head l, a rail 10 extending along the main shaft alignment direction is constructed by left and right supports 11, and a country type loader 1
2 is installed so that it can run freely.

The loader 12 supports a lifting shaft 15 on a running table 13 installed on the rail 10 via a back and forth moving table 14.
loader head】6, two loader chucks 1
7 (Fig. 2) is provided so as to be freely interchangeable between the downward direction and the direction facing the main shaft.

In addition, near both ends of the rail IO, there are a supply station that supplies unprocessed workpieces to the loader 12 and a discharge station that discharges processed workpieces (both not shown).
It is a provision.

The drive system of the main shaft 4.5 will be explained. One main shaft motor 18 is installed behind the central part of the bed 1, and two clutch-equipped pulleys 19 are attached to the motor shaft 18a as shown in FIG.
．． 20 is installed. These clutch pulleys 19,
20 has a bobbed portion on the outer periphery that can be switched between a rotatable tube and a rotation transmission state with respect to the motor shaft 18a, and both clutch-equipped pulleys 19. ．． 20 and a switching mechanism (not shown) in the clutch case 21, the clutch 2
2 is configured. In addition, each clutch pulley 19.20
It is preferable to have one with a brake.

Endless belts 23, 24 are hung on each clutch-equipped boo 'J19, 20, respectively, across pulleys 25, 26 provided at the rear end of each main shaft 4.5. As shown in Figure 1,
The path of each belt 23, 24 has guide pulleys 27 along the way.
．． By providing 28 and 29.30, each is formed into an L-shape.

Furthermore, the position of either one of the guide pulleys 27, 28 and one of the three guide pulleys 29.3 can be adjusted to a minimum of 100 degrees, and the tension of each belt 23.24 can be adjusted by this adjustment. The clutch 22 and the bell 1-23. '2
4 constitutes a power transmission mechanism 37.

The operation of the above configuration will be explained. When machining with the main shaft 4 on the left in FIG.
(Fig. 2) is in the engaged state and the pulley with clutch 20 is in the disengaged state, transmitting the rotation of the main shaft motor 18 to the left main shaft 4,
Then, the tool turret 6 is moved to the left and the tool 9 is used to perform machining. When a rotary tool among the tools 9 is used, the clutch pulley 19 on the main shaft 4 side is also in a disengaged state.

While machining with the main spindle 4, with respect to the other main spindle 5,
The loader 12 exchanges processed workpieces with unprocessed workpieces. In this case, the loader 12 has a loader head 16
The unprocessed workpiece is held in the downward facing loader chuck 17, and the processed workpiece of the main spindle 5 is picked up by the forward facing loader chuck 17.Then, the positions of both loader chucks 17 are switched and the unprocessed workpiece is transferred to the main spindle 5. .

When machining with the left main spindle 4 is completed, the clutch 22 is switched to enable rotation transmission to the right main spindle 5, and the tool turret 6
is moved to the right side, and the workpiece prepared on the spindle 5 is machined.

In this way, machining can be performed alternately with the main spindles 4.5 on both sides, and during the machining, workpieces can be exchanged with the other main spindles 4, 5 using the loader 12. Therefore, the cycle time for machining workpieces can be improved compared to an axle lathe.

If the actual machining time by the spindles 4 and 5 is shorter than the workpiece exchange time by the loader 12 (for example, about 20 seconds), the two spindles 4 and 5 are always used for machining or workpiece exchange, causing play. It is used effectively without any need. In addition, when the actual machining time is short like this, the conventional two-axis
Even in turret lathes, as mentioned above, the cycle time cannot be shortened because of the work change time limit, so even if there is only one turret 6 and one spindle motor 18, the cycle time for workpiece machining is shorter than the conventional two. It is the same as a lathe with two axes and turrets.

In this two-spindle lathe, the tool turret 6 and the main spindle motor 18 are used for both the main spindles 4.5, so the structure is simple, the cost can be reduced, and the occupied floor space is small. For example, compared to the two-axis, two-turret lathe shown in FIG. 4, the cost and floor space are both about 2/3. Furthermore, in the case of a workpiece that requires a short actual machining time as described above, the machining efficiency is comparable to that of a conventional two-axis, two-turret lathe.

FIG. 3 shows another embodiment. In this example, each headstock 2.3
An intermediate boot 131.32 is provided below the main shaft motor 18.
The rotation is transmitted from the main shafts 4 and 5 to the pulley 19 with clutch.
, 20 to the heald 33 hanging from the intermediate pulley 31° 32
．． ．． 35, and belts 34, 36 which are hung from the intermediate pulleys 31, 32 to the pulleys 25, 26 of the main shafts 4, 5. Even with this configuration, the same effects as in the embodiments described above can be obtained.

In each of the embodiments described above, the belts 23, 24, and 33 to 36 are used as the power transmission mechanism 37, but the power transmission mechanism 37 may be composed of a rotating shaft, a gear train, or the like. Also,
The clutch may be located anywhere on the transmission path from the main shaft motor 18 to the main shaft 4.5.

Furthermore, although each of the above embodiments has been described with reference to the case in which the loader 12 is provided, the loader 12 does not necessarily have to be provided, and the two spindles 4.5 can be effectively used even when changing workpieces manually. productivity can be improved.

〔Effect of the invention〕

The two-spindle lathe of the present invention has one tool turret between two main spindles, and a power transmission mechanism that transmits power from one main spindle motor to both main spindles by switching clutches. The tool turret and the spindle motor can be used in one unit, so the structure is simple and costs can be reduced, and the floor space occupied by the machine is also small.

Since there is only one tool turret, it is not possible to process with both spindles at the same time, but while machining with one spindle,
Workpieces can be exchanged using the other spindle, resulting in high productivity. Particularly in the case of a workpiece whose actual machining time is shorter than the workpiece exchange time, productivity is comparable to that of a conventional two-axis, two-turret lathe, making it more effective.

[Brief explanation of drawings]

Fig. 1 is a front view of one embodiment of the present invention, Fig. 2 is a cutaway side view thereof, Fig. 3 is a front view of a power transmission mechanism in another embodiment, and Fig. 4 is a front view of a conventional example. . 1... Bed, 2.3... Headstock, 4.5... Main spindle, 6... Tool turret, 7... Turret slide,
10-...Rail, 12...Loader, 17...Loader chuck, 18...Spindle motor, 19.20...
Pulley with clutch, 22...Clutch, 23.24.
...Belt, 25.26...Pulley, 27-30...
・Guide boo, 31.32-intermediate pulley, 33-36
...Belt, 37...Power transmission mechanism patent applicant
Murata Machinery Co., Ltd. Agent Patent Attorney Masashi Noda

Claims (1)

[Claims] Two main spindles are arranged parallel to each other apart from each other, and a tool turret movable in the direction in which the main spindles are arranged is provided between these main spindles,
2. A power transmission mechanism is provided for selectively transmitting power from one main shaft motor to both main shafts by switching a clutch.
Axis lathe.