JPH03256601A - Turret indexing device - Google Patents

Abstract

PURPOSE:To shorten a time up to gaining motor torque to a maximum necessary for start and shorten a turret indexing time by providing an accumulator between a hydraulic motor and a hydraulic indexing motor. CONSTITUTION:Oil pressure energy which is accumulated in an accumulator 33 is supplied to a hydraulic indexing motor 26 when starting, and more pressure oil than usual is supplied to the motor 26. As a result, a time up to gaining motor torque to a maximum necessary for start can be shortened. Next, when turrets 8, 9 start rotation, oil pressure energy in the accumulator 33 is discharged off to rotate the motor 26 at a usual flow rate from a hydraulic pump unit 19 and thus to rotate the turrets 8, 9. The rotating positions of the turrets 8, 9 are detected by a rotating angle sensor, to allow a rotating direction change valve 28 to be changed to a B position when an application toll is at a desired position. In this way, the rotation of the motor 26 is stopped and the rotation of the turrets 8, 9 are also stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a turret indexing device for positioning the rotation angle of a turret 1/tooth 1 on which a tool is attached.

[Conventional technology]

Conventionally, a turret lathe has been used to perform various processing on rod-shaped glue. Turret: A lathe is equipped with a main shaft that has a chuck at its tip for holding a workpiece, and a turret that is installed parallel to the main shaft. Taret I・
is equipped with a plurality of machining tools L on its outer periphery, and the angular position is determined by an indexing device so that a worker can be selected.

The indexing device for rotating the turret and selecting a tool includes a hydraulic pump, a hydraulic index motor driven by pressure oil from the hydraulic pump, and a meshing part for inhibiting rotation of the turret shaft. It has a clamping device V and L7. When selecting the tool mounted on the turret, first use the clamping device to
The turret shaft is made rotatable, and the turret is rotationally driven by the hydraulic index motor. -1PL,
Then, the rotational angular position of the turret shaft is fixed by a clamp device at a predetermined angular position.

[Problem to be solved by the invention]

By the way, recently, in order to increase the speed of machining, there is a demand for shortening machining time and improving operating efficiency.

In order to shorten the machining time and improve operating efficiency, it is necessary to shorten the positioning of the rotation angle of the turret (hereinafter referred to as turret index time). Particularly recently, turrets have become larger and there is a problem in that it takes time to start up the turret.

In general, turret indexing devices use a hydraulic index motor as mentioned above, so the index time of the turret is determined by the performance of the motor used.In order to shorten the index time, hydraulic pressure is used. However, if the oil pressure is increased too much, it is necessary to increase the pressure resistance of each mechanical part and seal part, which causes the problem that the equipment becomes expensive and large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a turret indexing device that has a simple configuration and can reduce indexing time at low cost.

[Means to solve the problem]

The turret indexing device according to the present invention is for positioning the rotational angle of a turret on which a tool is attached. The system also includes a hydraulic pump, a hydraulic index motor driven by pressure oil from the hydraulic pump to rotate the turret, and an accumulator provided between the hydraulic pump and the hydraulic index motor.

[Effect]

In the present invention, for example, an accumulator is provided in front of the hydraulic index motor, and the pressure energy of pressure oil from the hydraulic pump is stored in the accumulator when the turret is driven to rotate.

When the turret is next rotated and started, a large amount of pressure oil from the hydraulic pump and the pressure oil accumulated in the accumulator during the previous turret drive are supplied to the hydraulic index motor.

As a result, the flow rate of the pressure oil supplied to the hydraulic index motor at the time of starting the turret increases, and the time required for the motor torque to reach the maximum torque required at the time of starting the turret is shortened.

〔Example〕

FIG. 2 is a perspective view of a turret lathe employing a turret indexing device according to an embodiment of the present invention.

The turret lathe has a base 1. A main shaft rad 2 is provided at the center of the upper surface of the base 1, and two main shaft chucks 3 and 4 are disposed on the main shaft rad 2. Furthermore, a reversing device 5 is provided above the spindle head 2 for reversing the work being processed. Turret devices 6 and 7 are provided on the upper surface of the base 1 on both left and right sides of the main shaft rad 2. These turret devices 6 and 7 are movable in the left-right direction and the front-back direction by a moving mechanism such as a guide rail and a ball screw provided on the upper surface of the base 1 or the like. In addition, the turret device 6
and 7 each rotatably support a turret shaft. At the front end of each turret shaft, tool turrets (hereinafter simply referred to as turrets) 8 and 9 to which a plurality of tools can be attached are provided on the outer periphery.

A gantry loader lO for transporting a workpiece is provided above the turret lathe. A rail 11 constituting the gantry loader 10 is installed above the turret lathe in the left-right direction.

Further, a hydraulic unit 12 for driving a turret indexing device is arranged on the side of the turret lathe. The hydraulic unit 12 and the turret devices W6 and 7 are connected by hydraulic pipes 13 and 14.

FIG. 1 shows a hydraulic circuit diagram of the turret indexing device. Note that the hydraulic circuit shown in FIG. 1 is shown for only one turret, and the hydraulic circuit corresponding to the other turret also has the same circuit configuration as the circuit shown in FIG. 1.

This turret index device includes a hydraulic pump unit 19, a hydraulic index motor unit 20 for rotating the turret 8.9, and an accumulator 33 provided in front of the hydraulic index motor unit 20.
It has a chinic valve 34 provided between the accumulator 33 and the hydraulic pump unit 19.

The hydraulic bomb unit) 19 includes a hydraulic pump 22 rotated by an electric motor 21, a filter 23, and a pressure control valve 2.
4. The hydraulic pump unit 20 controls the oil from the hydraulic tank 25 to a predetermined pressure and supplies it to the hydraulic index motor unit 20 side.

The hydraulic index motor unit 20 includes a hydraulic index controller 26, a switching valve 27 for controlling the drive of the hydraulic index motor 26, and a switching valve 28 for controlling the rotation direction of the hydraulic index motor 26.
, a speed control valve 29, and a fixed throttle valve 30.31. In addition, this hydraulic index motor unit 2
1 is connected to a clamping device 32 for clamping the turret shaft of the turret 8.9.

Although not shown in detail, the clamping device 32 includes a piston for moving the turret shaft back and forth in a short stroke, and meshing teeth provided on each of the turret shaft and the frame side.

When the meshing teeth disengage, the turret shaft becomes rotatable (unclamped state 1), and when engaged, rotation is prohibited (clamped state IQ), and then in the unclamped state. When the clamp device 3
Pressure oil from 2 is supplied to the switching valve 28.

Next, the operation will be explained.

When machining is performed using the tools of the turrets 8, 9, each turret 8, 9 is prevented from rotating by the clamping device 32. In this state, the drive control switching valve 27 is controlled to be switched to the C position as shown in FIG. Further, the rotation direction switching valve 28 is controlled to be switched to the B position. Thereby, the pressure oil supplied from the hydraulic pump unit 19 is supplied to the clamp chamber side of the clamp device 32, and moves the turret shaft rearward (downward in FIG. 1). Thereby, the meshing teeth formed on the turret shaft and the frame mesh with each other. Further, the pressure oil discharged from the clamp device 232 is stopped by the rotation direction switching valve 28.

Hydraulic energy from the hydraulic pump unit 19 is stored in the accumulator 33.

When changing the tool to be used next, use the turrets 8 and 9.
In this case, the rotation direction switching valve 2 of the hydraulic index motor unit 20 is rotated to select a tool.
8 is set to the A or C position, and the drive control switching valve 27 is set to the A position via the B position. Thereby, oil from the hydraulic pump unit 19 is supplied to the unclamping chamber of the clamp device 32 via the drive control switching valve 27. on the other hand,
The oil in the clamp chamber of the clamp device 32 is discharged into the hydraulic tank 25 via the drive control switching valve 27. As a result, the turret shaft moves forward, the turret shaft and the meshing teeth formed on the frame are disengaged, and the turret shaft becomes rotatable.

Further, the oil supplied from the hydraulic pump unit 19 passes through the unclamping chamber of the clamp device 32 and the rotation direction switching valve 28 to the hydraulic index motor 26.
is supplied to This causes the turret shaft of the turret 8.9 to be rotated by the hydraulic index motor 26.

At this time, when starting the turret 8.9, a torque larger than that required for normal rotation is required. Pressure oil is supplied to the motor 26 at a flow rate greater than that in a steady state.

Therefore, the time required for the motor torque to reach the maximum torque required at startup can be shortened.

When turret 8.9 starts rotating, accumulator 3
Hydraulic energy of 3 is released and hydraulic pump unit 1
Hydraulic index motor 2 with normal flow from 9
6 rotates, which causes the turret 8.9 to rotate.

The rotational position of the turret 8.9 is detected by a rotation angle sensor such as an encoder. Then, when the tool to be used reaches the desired position, the rotation direction switching valve 28 is turned to B.
Switch to position. This stops the rotation of the hydraulic index motor 26 and also stops the rotation of the turret 8.9. At approximately the same time, the drive control switching valve 27 is switched from the B position to the C position. Then, the clamp device 32
Oil is supplied to the clamp chamber, and oil in the unclamp chamber is returned to the hydraulic tank 25. As a result, the turret shaft moves forward, and the meshing teeth of the turret shaft and the frame engage with each other, thereby inhibiting rotation of the turret shaft.

In such an embodiment, by simply adding an accumulator, the talent index time can be shortened with a very inexpensive configuration.

[Other Examples]

(a) FIG. 3 shows a second embodiment of the present invention.

This embodiment device includes a first hydraulic pump unit 19, a hydraulic index motor unit 20, an accumulator 33, and a check valve 3 similar to the embodiment shown in FIG.
It has 4. Furthermore, in this embodiment, the second
A hydraulic pump unit 35 is connected to the accumulator 33. This second hydraulic pump unit 3
5 has a small capacity compared to the first hydraulic pump unit 19, but the pressure control valve is set to a pressure value B that is higher than the pressure value A of the first hydraulic pump unit) 19. There is.

The second hydraulic pump unit 35 includes a hydraulic pump 37 rotated by an electric motor 36, a filter 38, and a pressure control valve 39. This pressure control valve 39 is
As described above, the pressure setting value B of the first hydraulic pump unit 19 is set to a higher value than the pressure setting value A. A check valve 40 is provided between the hydraulic pump unit 35 and the accumulator 33.

In such an embodiment, during normal operation, the pressure oil supplied to the hydraulic index motor unit 20 side is
The pressure value A is determined by the large capacity first hydraulic pump unit. However, at startup, the second hydraulic pump unit 35 supplies the hydraulic oil at the pressure B accumulated in the accumulator 33 to the hydraulic index motor unit 20.

That is, since the second hydraulic pump unit 35 has a small capacity, the supply of pressure oil cannot keep up with the rotation of the hydraulic index motor 26. Therefore, during normal operation,
Pressure oil (pressure A) from the first hydraulic pump unit 19 is supplied to the hydraulic index motor unit 20 side, and the pressure oil at pressure A is also accumulated in the accumulator 33 .

However, as during machining, the hydraulic index motor 26
is stopped, the second hydraulic pump unit 3
The pressure oil (pressure B) from 5 gradually flows into the accumulator 33.
The pressure inside the accumulator 33 becomes a pressure B higher than the pressure A.

Therefore, when the turret is activated, the pressure oil at pressure B accumulated in this accumulator 33 is supplied to the hydraulic index motor unit 20 side.

Thereby, the time required for the motor torque to reach the maximum torque required at startup can be shortened.

After the pressure oil in the accumulator 33 is released, the pressure oil at pressure A from the first hydraulic pump unit 19 is supplied to the hydraulic index motor unit 20 as described above.

Note that at the time of startup, pressure oil at a high pressure B is supplied to each part, but since it is for a short time, no problem will occur even if the pressure resistance of the seal part etc. is set to pressure A.

(b) FIG. 4 shows a third embodiment of the present invention.

In addition to the embodiment shown in FIG. 3, this embodiment also includes an accumulator 33 and a hydraulic index motor unit 2.
0, a pressure switch 42 for detecting oil pressure is provided in front of the hydraulic index motor unit 20, and the switching valve 41 is switched and controlled by an electric signal from the pressure switch 42. It is something.

In this embodiment, during normal turret rotation, pressure oil from the first hydraulic pump unit 19 is supplied to the hydraulic index motor unit 20. In this case, the pressure before the hydraulic index motor unit 20 is pressure A.
It is. The pressure switch 42 detects this pressure A and switches the switching valve 41 to the C position.

On the other hand, the second hydraulic pump unit 35 generates a pressure B in the accumulator 33 when the turret is being rotated by the first hydraulic pump unit 19 or when the turret is stopped such as during machining. It stores pressurized oil.

In this state, when trying to rotate the turret 8.9 for tool exchange, the hydraulic index motor unit 2
When each switching valve 0 is switched, the oil pressure in front of the hydraulic index motor unit 20 becomes lower than the pressure A.

This decrease in pressure is detected by the pressure switch 42, and the switching valve 41 is switched to the D position. Then, the pressure oil at pressure B stored in the accumulator 33 is supplied to the hydraulic index motor unit 20, and the pressure oil at pressure B, which is higher than the normal pressure A, is supplied to the hydraulic index motor unit 20 side. Become. Then, when the maximum torque at startup is exceeded and a steady state is reached, the oil pressure before the hydraulic index motor unit 20 becomes high again, so the pressure switch 42 detects this and switches the switching valve 41 to the C position. After that, the first hydraulic pump unit 2
Pressure oil with a pressure of A from 0 is supplied to the hydraulic index motor unit 21.

Even in such an embodiment, the time required for the motor torque to reach the maximum torque required at startup can be shortened.

〔Effect of the invention〕

As described above, in the present invention, since the accumulator is provided between the hydraulic motor and the hydraulic index motor, the flow rate of pressure oil can be increased at the time of startup, and the time required for the motor torque to reach the maximum torque required at the time of startup can be increased. Shorten it,
Turret index time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a hydraulic circuit diagram of a turret indexing device according to a first embodiment of the present invention, FIG. 2 is a perspective view of a turret lathe in which the turret indexing device is adopted, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a hydraulic circuit diagram of a turret indexing device according to a third embodiment of the present invention. 8.9...Turret, 12...Hydraulic unit, 19
... first hydraulic pump unit, 20 ... hydraulic index motor unit, 33 ... accumulator,
35...Second hydraulic pump unit. 11th! iQ 2,

Claims (1)

[Claims] (1) An indexing device for positioning the rotation angle of a turret on which a tool is attached, comprising: a hydraulic pump; a hydraulic index motor driven by pressure oil from the hydraulic pump to rotate the turret; A turret index device comprising: an accumulator provided between the hydraulic pump and the hydraulic index motor.