JPH0442134B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a machine tool equipped with an attachment indexing function.

(Prior art) A machine tool equipped with an attachment indexing function includes a spindle head that rotatably supports the spindle, a spindle drive motor that rotationally drives the spindle, and a clamp mechanism that clamps the spindle to the spindle head. or an attachment body to be unclamped, and an attachment that is rotatably supported by the attachment body so as to be rotatable around an axis that intersects the main shaft when the attachment body is attached to the main shaft head, and is rotated in conjunction with the main shaft. When the attachment body is clamped to the spindle and the spindle head, rotation transmission from the spindle to the attachment body is canceled, and when the attachment body is unclamped to the spindle head, the attachment body is supported on the spindle and the rotation of the spindle is controlled. Some rotation transmission means are capable of transmitting rotation to the attachment body.

(Problem to be Solved by the Invention) In this type of machine tool, rotation indexing of the attachment body is performed by rotating the spindle from a fixed position where the spindle is stopped, and at that time, the attachment spindle and the attachment body are rotate as one. Therefore, even if the position of the main spindle (usually the main spindle key) and the position of the attachment main shaft (usually the attachment key) are in a predetermined relationship before rotation indexing, the positional relationship will change when the attachment body is rotationally indexed. collapsed,
Even if the main spindle is stopped at a predetermined position after machining is once performed by the machine tool, the attachment main spindle does not stop at the predetermined position. If this happens, the direction of the cutting edge of the tool attached to the attachment spindle will be different from the intended direction, so in order to release the tool edge from the workpiece, the program for moving the spindle head will be changed before and after rotation indexing of the attachment body. There is a need.

The present invention has been made in view of this problem, and its purpose is to ensure that even if the attachment body is rotated and indexed, the attachment spindle (usually the attachment key) remains at a predetermined position after processing by the machine tool. The purpose is to stop the vehicle at

(Means for Achieving the Object) In order to achieve the object, the present invention provides the above-described machine tool with a motion device for transmitting an integral multiple of the rotational speed of the main spindle to the attachment spindle; A position detector such as an encoder that detects the rotation angle, a storage means that stores the signal from the position detector immediately after the attachment body is clamped to the spindle head as the angular position of the attachment body, and a storage means that clamps the attachment body to the spindle head. In this case, a comparator is provided which compares the angular position stored in the storage means with the signal from the position detector and stops the main shaft drive motor when the two match.

(Function) Immediately before rotation indexing, the main shaft is stopped at a predetermined fixed position, and the attachment main shaft, which rotates at an integral multiple of the main shaft, is also stopped at a predetermined fixed position with respect to the attachment body. In response to a rotation index command from the control device, the attachment body is first unclamped from the spindle head and engaged and supported by the spindle via the rotation transmission means, and then the spindle is rotated and the attachment body is rotationally indexed to the set angle position. It is taken out and clamped, and this angular position is stored in the storage means. Since the attachment body is rotated integrally with the main shaft, the attachment main shaft is held in a fixed position relative to the attachment main body during this rotation.

After finishing machining, etc., the control device rotates the spindle, and the comparator compares the angular position of the attachment body stored in the storage means with the signal from the position detector, and stops the spindle drive motor when the two match. let As a result, the main shaft is stopped at the angular position immediately after the attachment body is clamped to the main shaft, so that the attachment main shaft is also stopped at a predetermined position relative to the attachment main body.

(Effects of the Invention) As described above, according to the present invention, the attachment spindle can be stopped at a fixed position at the end of machining with the machine tool after rotation indexing of the attachment body, and the movement program of the spindle head can be changed. There is no need to change before and after rotation indexing.

(Example) An example of the present invention will be described below based on the drawings. In FIG. 1, the main shaft 10 is gear train 1
1. It is connected to a main shaft drive motor 13 via a transmission 12, and is rotatably supported by a main shaft head 14. Further, when the attachment 20 is not attached to the spindle head 14, the spindle 10 is configured to stop at a fixed position with the spindle key 10a on the right side as shown in the figure in response to a stop command issued from a well-known control device. ing. As is well known, the main shaft head 14 is configured to be moved by a moving device (not shown), and is provided with a clamp shaft 15 and an attachment 20. The clamp shaft 15 has a lower end 15a formed in an elliptical shape, and the clamp shaft advance/retreat drive cylinder 1
6, and rotated approximately 90 degrees by a clamp shaft rotation drive motor 17, as shown by the imaginary line.
The attachment 20 can be attached and detached while being moved downward and rotated approximately 90 degrees. The clamp shaft 15, clamp shaft forward/backward driving cylinder 1
6. A clamping mechanism for clamping or unclamping the attachment 20 to the main shaft head 14 is configured by the clamp shaft rotation drive motor 17.

The attachment 20 is an attachment body 2
1, consisting of a mounted member 22, an intermediate shaft 23, an attachment main shaft 24, etc.
A tool 30 is removably attached to the holder. The attachment body 21 is clamped or unclamped by a clamp shaft 15 provided on the spindle head 14, and is fixed to the spindle head 14 when clamped and is rotatable relative to the spindle head 14 when unclamped. In addition, the attachment body 2
1, the phase between the spindle head 14 and the attachment body 21 is determined by the carboxylic coupling 40 provided between the spindle head 14 and the attachment body 21. Mounted member 2
2 is movably guided in the axial direction of the intermediate shaft 23 with respect to the intermediate shaft 23 and is pressed by a pressing spring 25, and is mounted on the tool mounting portion of the main spindle 10, and is inserted through the main shaft key 10a. It is configured to transmit rotation. Further, the mounted member 22 is provided with a gear 22a that engages with a gear 21a provided on the attachment body 21 by a pressing spring 25 when the attachment body 21 is unclamped. Both gears 21a and 22a support the attachment body 21 on the main shaft 10 during unclamping, and transfer the rotation of the main shaft 10 to the attachment main body 21.
It constitutes a rotation transmission means for transmitting the rotation to. The upper end of the intermediate shaft and the lower end of the attached member 22 are chamfered to transmit rotation from the attached member 22, and are rotatably supported by the attachment body 21. Attachment main shaft 24
The rotation is transmitted from the intermediate shaft 23 at the same rotation speed through an interlocking device consisting of a pair of bevel gears 23a and 24a, and is supported by the attachment body 21 so as to be rotatable around an axis perpendicular to the main shaft 10. ing. A tool clamp cylinder 26 is provided at the right end of the attachment spindle 24 for clamping or unclamping the tool 30 via a not-shown rod supported within the attachment spindle 24. In addition, the attachment main shaft 24
The tool 30 attached to the left end of the attachment key 24b is attached to the left end of the attachment main shaft 24.
The structure is such that rotation is transmitted through the When the attachment body 21 is unclamped, the gears 21a and 22a of the attachment body 21 and the attached member 22 are engaged with each other so that the attachment main shaft 24 is stopped at a predetermined position relative to the attachment body 21.

In this embodiment, an encoder 50 is connected to the gear train 11, and as shown in FIG. 2, a timer 51, a comparator 52, a memory 53, etc. Built-in. The encoder 50 is a position detector that indirectly detects the rotational index angle of the attachment body 21 by detecting the angular position of the main shaft 10, and inputs the angular position of the main shaft 10 into the comparator 52. The timer 51 is operated by a main shaft fixed position stop command issued from a well-known control device to stop the main shaft 10 at a fixed position, and as shown in FIG. Give operating command. The comparator 52 is connected to a memory 53 that stores the angular position of the main shaft 10 indicating the angular position of the attachment body 21 immediately after rotational indexing or clamping, and an encoder 5.
The signals from 0 are compared, and when the two match, a stop command is given to the spindle motor drive circuit 54.
Further, the spindle motor drive circuit 54 is given a high-speed rotation command to rotate the spindle drive motor 13 at high speed in response to a spindle rotation start command for machining issued from a known control device, and a spindle rotation command issued from a well-known control device to rotate the spindle drive motor 13 at high speed. A low speed rotation command for rotating the main shaft drive motor 13 at a low speed is given by the fixed position stop command and the attachment body rotation start command. Although not shown in FIG. 2, the attachment body 21 is unclamped prior to the attachment body rotation start command, and when the attachment body 21 is rotationally indexed to the set angle position after the attachment body rotation start command is issued. A stop command is given to the spindle motor drive circuit 54, and the attachment body 21 is subsequently clamped.

In this embodiment configured as described above, immediately before the rotation indexing of the attachment main body 21, the main shaft 10 is stopped at a fixed position with the main shaft key 10a on the right side as shown in the figure, and the attachment main shaft 24 is also The attachment key 24b is stopped at a predetermined position on the upper side of the main body 21. First, the clamp by the clamp shaft 15 is released, the attachment body 21 is slightly lowered, and the gear 21a of the attachment body 21 is released.
meshes with the gear 22a of the mounted member 22. Next, the main shaft drive motor 13 is rotated at low speed,
The attachment body 21 is rotated by the spindle 10 to a set angular position (for example, 90 degrees) with respect to the spindle head 14, and is stopped at that position. During this rotation and immediately after the rotation stops, the attachment main body 21 is integrally engaged with the main shaft 1 due to the meshing of both gears 21a and 22a constituting the rotation transmission means, so that the attachment main shaft 24 is The attachment key 24b is held in a fixed position on the upper side. In this state, the attachment body 21 is clamped by the clamp shaft 15, the rotational index angle of the attachment body 21 is detected as the angular position of the main shaft 10 by the encoder 50, and the output of the encoder 50 is loaded into the memory 53. .

When the main shaft rotation start command is issued after the attachment main body 21 has been rotationally indexed in this manner, the main shaft drive motor 13 is rotated at high speed.
The rotation of the main shaft drive motor 13 is transmitted to the main shaft 10 via the transmission 12 and the gear train 11, and further transmitted to the attachment main shaft 24 via the attached member 22 and the intermediate shaft 23, where a predetermined machining is performed using the tool 30. It will be done. When the machining is completed, a main spindle fixed position stop command is issued, the timer 51 is activated, and the rotation of the main spindle drive motor 13 is sequentially reduced to a low speed as shown in FIG. When the timer 51 times up, the main shaft drive motor 13 is rotating at a low speed. After that, the comparator 52 compares the data stored in the memory 53 with the data from the encoder 50. When the stored data matches the data, the main shaft drive motor 13 rotates at low speed. A stop command is issued to the motor drive circuit 54, and the main shaft 10 is stopped. As a result, the main shaft 10 is stopped at the angular position immediately after the attachment body 21 is clamped, so that the attachment main shaft 24, the tool 30, etc. are also stopped at a predetermined position relative to the attachment main body 21.

As described above, in this embodiment, the attachment spindle 24 can be stopped at a fixed position at the end of machining with the machine tool after rotation indexing of the attachment body 21, and the movement program of the spindle head can be changed before and after rotation indexing. There is no need to change anything.

In the above embodiment, the spindle drive motor 13 is rotated at a low speed by the spindle fixed position stop command, and the attachment spindle 24 is then stopped at a fixed position. The main shaft drive motor 13 may be first stopped, and then the attachment main shaft 24 may be rotated and stopped at a fixed position.

In the above embodiment, the rotational index angle of the attachment body 21 is indirectly detected by detecting the angular position of the main shaft 10 and stored in the memory 53 to implement the present invention. 21 is directly detected by a separate detector, the rotation index angle of the attachment body 21 is memorized by this detector, and after machining is completed, this memorized content and the rotation angle of the main shaft 10 are detected.Position detection The attachment main shaft 24 may be stopped at a fixed position by comparing the data from the device.

Further, in the above embodiment, the bevel gears 23a, 24
The interlocking device consisting of a is designed to transmit the rotation of the intermediate shaft 23 to the attachment main shaft 24 at the same rotation speed.This interlocking device transmits the rotation of the intermediate shaft 23 to the attachment main shaft 24 at the same rotation speed. The attachment main shaft 2 is configured to stop at a predetermined fixed position, and therefore the rotation of the intermediate shaft 23 is set as an integral multiple (including 1).
4.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a machine tool showing an embodiment of the present invention, Fig. 2 is a control circuit diagram of the spindle drive motor shown in Fig. 1, and Fig. 3 is a diagram showing the rotation of the spindle drive motor and the operation of the timer. FIG. Explanation of symbols, 10...Main shaft, 13...Main shaft drive motor, 14...Main shaft head, 15...Clamp shaft, 20...Attachment, 21...Attachment body, 21a, 22a...Rotation transmission means (gear) , 23a, 24a... Interlocking device (bevel gear), 24... Attachment main shaft, 50... Position detector (encoder), 52... Comparator, 53
...Storage means (memory).

Claims (1)

[Claims] 1. A spindle head that rotatably supports the spindle, a spindle drive motor that rotationally drives the spindle, an attachment body that is clamped or unclamped to the spindle head by a clamp mechanism, and this attachment body is attached to the spindle head. The attachment main shaft is rotatably supported by the attachment main body and rotates in conjunction with the main shaft in a state where the attachment main shaft is rotatable around an axis that intersects with the main shaft, and when the attachment main shaft is clamped to the main shaft head, the attachment main shaft of the main shaft is rotated in conjunction with the main shaft. When the attachment body is unclamped to the spindle head, the attachment indexing function consists of a rotation transmission means that supports the attachment body on the spindle and transmits the rotation of the spindle to the attachment body. A machine tool comprising: an interlocking device that transmits an integer multiple of the rotational speed of the spindle to the attachment spindle; a position detector such as an encoder that detects the rotation angle of the spindle; and an attachment body clamped to the spindle head. A storage means for storing the immediately following position detector signal as the angular position of the attachment body, and when the attachment body is clamped to the spindle head, the angular position stored in the storage means and the signal from the position detector. A machine tool equipped with an attachment indexing function, characterized in that a comparator is provided for comparing the two values and stopping the spindle drive motor when the two match.