JPH01301032A - Indexing device for main shaft carrier in multishaft machine tool - Google Patents

Abstract

PURPOSE:To simplify indexing by interposing a shiftable intermediate gear between the gear of a main shaft motor and the main shaft gear and indexing the main shaft carrier by meshing with the gear provided on the outer periphery of the main shaft carrier by shifting the intermediate gear. CONSTITUTION:Plural main shafts 5 are arranged on a main shaft carrier and rotated with the number of revolutions being variable by a gear 8, 2nd gear 10 and main shaft gear 13 by the driving of a motor 7 independently respective ly. The 2nd gear 10 is made shiftable by a cylinder 12 and at the shifting time the rotation of the gear 8 is indexed by the main shaft carrier with the gear 10 being meshed with the gear 14 provided on the outer periphery of the main shaft carrier and rotated. The relative positional relation of the gears 10, 13 and gears 13, 14 at this time is maintained by locking to a pin hole 16 with the operation of a pin1 5. A number of the main shafts 5. Consequently indexing can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indexing device for a spindle carrier in a multi-spindle machine tool.

Specifically, in a turning machine tool that has multiple spindles arranged on the circumference of the spindle carrier, the carrier is sequentially indexed to a preset machining position according to the machining process of the workpiece, and each spindle is This invention relates to an indexing device for a spindle carrier in a multi-spindle lathe that performs synchronous machining in a process and processes one product in one indexing cycle of the carrier. Conventionally, indexing control of a spindle carrier, which is known for multi-spindle automatic lathes, etc., involves connecting a large-diameter gear and a small-diameter gear provided on the outer periphery of the spindle drum, which is a carrier, via a Geneva gear or a link mechanism. The spindle carrier was indexed sequentially in accordance with the machining process by driving a camshaft that rotated intermittently by transmission of a worm that was decelerated at a division ratio corresponding to the number of spindles. In addition to the indexing drive system of the spindle carrier, the camshaft also controls the feed of the tool, and one revolution of the camshaft finishes one product, making it difficult to adjust the timing of both drive systems. A transmission drive means is involved, making the groove structure complicated. In addition, the spindle drive is such that each spindle is rotated through one spindle motor at the same speed ratio, and it is difficult to select an appropriate rotation ratio depending on the machining process. It is an object of the present invention to provide a novel spindle carrier indexing device that solves these problems.

Hereinafter, the present invention will be explained based on practical drawings.

1 is a bed in the multi-spindle lathe according to the present invention, 2 is a headstock fixed to the bed 1, 3 is a spindle carrier supported on the headstock 2 so as to be rotatable around the longitudinal direction of 1; A plurality of spindles 5 equipped with chucks 4 for gripping a workpiece with a tip scoop are rotatably arranged at equal intervals around the circumference of the spindle carrier 3. Reference numeral 6 denotes a tool stand arranged at a machining position corresponding to the number of spindles 5, and includes a lateral feed tool stand 6a that moves in a transverse direction with respect to the spindle 5, and a spindle carrier 3.
The spindle carrier 3 rotates synchronously with or independently of the rotation of the spindle carrier 3.
It consists of a vertical feed tool stand 6b mounted at the center and capable of feeding in the vertical direction. 7 is a spindle motor whose spindle rotation speed can be arbitrarily selected;
It is equipped with au on the top.

The main shaft motor 7 is operated according to numerical commands from the machine, and a servo motor or an AC motor converted to an inverter is used. 8 is ζ on the drive shaft 9 of the main shaft motor 7
This is the fixed first I# wheel, and one of the first gears 8 is connected to the other spur gear of the second first gear 8 because it is also used with a transmission drive system for indexing control of the main shaft carrier, which will be described later. Slightly wider than the tooth width. 10 is a second gear which meshes with the first gear 8 and is rotatably engaged with an intermediate shaft 1'l supported parallel to the axis of the drive shaft 9; It has a shift mechanism that operates the second gear IO relatively in the axial direction of the intermediate shaft 11 through an operating means, and includes a third gear 13 fixed on the main shaft 5 and a third gear IO fixed on the outer periphery of the main shaft carrier 3. It is possible to cut by one tooth with the large-diameter fourth gear 14. The main shaft motor 7 has a second gear 10 and a third gear 1.
When engaged with 3, it controls the main shaft transmission drive system, and the 2nd
When the gear 10 is meshed with the fourth gear I4, it controls the indexing drive system of the main shaft carrier 3. Lord 1
Since a servo motor or the like is used for the 1QI+ motor 7, it is possible to stop the main shaft 5 at a fixed rotation angle. Equipped with an orientation function that allows the mutual phase alignment of the gears to function smoothly when the gears engage or disengage. Specifically, as can be understood from the above explanation, the main shaft 5 is rotationally driven by the transmission of the first, second, and third gears, which are the gear groups of the main shaft transmission drive system, and when the main shaft yA is excited, the gear group In order to maintain a constant relationship even when the second gear 10 and the third gear 13 are separated from each other, each main shaft transmission drive system has a unique phasing mechanism for each revolution of the main shaft 5. A signal (for example, HARUS) generated by the position detection means 14 for detecting the rotation angle position of the spindle is fed back to the TIE shaft drive unit 1-15 and compared with a pulse generated from the spindle drive unit 15 that is equal to a predetermined spindle rotation division angle. It has an orientation function of stopping the main shaft 5 at a predetermined rotation angle from the previous unique rotation angle position, and positioning is performed by an orientation pin I5.

The orientation pin 15 is a third pin fixed to the main shaft 5.
The pin 5, which has a relative relationship with the gear I3 and has an axis parallel to the main shaft 5 axis, moves in and out of the positioning hole 16 provided at one location on the circumference of the third gear 13. Related IL: This is for positioning. The orientation pin 15 is actuated by actuation of the fluid cylinder I7. Also, the first gear 8, which is the gear group of the indexing drive system of the main shaft carrier, and the shift gear? When meshing with the JS2 gear and the fourth gear JO114, the mutual phases of the third gear 13 of the main shaft transmission drive system and the fourth gear 14 of the index drive system of the main shaft carrier are aligned with the orientation pin I.
5 maintains that relative relationship.

Although not shown, the spindle carrier 3 has a positioning means such as a dowel pin or a coupling that positions the spindle 5 at the processing position, which is sequentially indexed to the corresponding processing position according to the process of the workpiece. and headstock 2
It is equipped with special equipment.

Next, its effect will be explained.

First, the main shaft transmission drive system will be described.

As explained above, since the spindle motor 7 uses a servo motor that operates based on numerical commands from the machine, it is possible to not only convert the spindle rotation speed control but also control the spindle to stop at a fixed position at a constant angle. It is possible. When the fluid cylinder I2 of shift machine F:i is located at the original position, the first gear 8 and the second
The gear 10 and the third gear 13 are meshed with each other by 111 degrees, and the optimum rotation speed corresponding to the machining process assigned to each spindle 5 is set, and the numerical value set from the numerical command side is set. This command is distributed to each servo motor, and the main shaft 5 is rotated through the transmission drive of the gear group of the main shaft transmission drive system. Next, machining is started through the feed operation of the tool stand 6, and when machining corresponding to the process on each spindle 5 is performed, the fluid cylinder 12 of the shift mechanism is positioned in the state shown by the dotted chain line in FIG. Then...

The second gear 10 is separated from the third gear I3 and the main shaft carrier 3
It meshes with the fourth gear 14 of the indexing drive system.

At this time, the second gear 10, the third gear 13, and the third gear 1
The relative phase relationship between the third gear and the fourth gear 14 is maintained by the operation of the orientation bin 15, which locks the bin 15 in the bin hole 16. At least, when the rotation of the main shaft 5 stops, the orientation pin 15 is locked in the pin hole 16, and the main shaft 5 is positioned at a predetermined rotation angle.When the second gear IO meshes with the fourth gear 14, the main shaft The dowel pin or coupling, which is a positioning means for the carrier 3, is released from the positioning relationship with the spindle carrier 3, and the spindle carrier 3 can be indexed and driven. The first gear 8 and the second gear 1 of the gear group of the indexing drive system of the main shaft carrier 3
The main shaft carrier 3 is indexed by one step through the transmission drive of the zero and fourth wheel 14. In this way, the above process is repeated every time the spindle carrier 3 is indexed by a step, and different processes are performed on the spindle, and when the spindle carrier 3 has been indexed by a number corresponding to the number of spindles, the cycle ends. One product is finished.

Therefore, in the present invention, the rotation speed of each main shaft 11QI+ can be changed steplessly, and the indexing drive control of the main shaft carrier is performed by the gear group of the main shaft transmission drive system through one of the main shaft motors. Since the cutting operation is organically related to the gears of the indexing drive system of the spindle carrier, the construction is simple and there is no need to equip an expensive independent indexing means.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a side view of FIG. 1. 3-Spindle carrier End-Spindle 6- Tool stand 7-
Main IQI+motor I O-2nd gear I4-
4th gear

Claims (1)

[Claims] In turning machine tools that have multiple spindles arranged around the circumference of a spindle carrier that can be indexed to the machining position, spindle transmission drive that allows the rotation speed of each spindle to be changed independently and steplessly. A main spindle carrier in a multi-spindle machine tool, characterized in that a system means, a means for shifting the meshing of the main shaft transmission drive system means with a drive system gear group, and a gear that meshes with the shifted gear are provided on the main spindle carrier. indexing device.