JPH04250901A - Machine tool - Google Patents

Abstract

PURPOSE:To compactly manufacture a machine tool which indexes a plurality of works while machines the works in order as required and to carry out machining on both sides of the works. CONSTITUTION:A jig drum 3, which is provided with a plurality of jigs 5 at its periphery, is interposed in the intermediate part of a rotary shaft 4, whose shaft is supported by a base table 1 and which is index rotated. At the same time, a working unit 10, which is provided with a plurality of working heads 11, is fitted from the outside to the periphery of the rotary shaft 4 in such a manner that the unit 10 can freely advance or retreat with respect to the rotary shaft 4. As the working unit 10 advances, the work on each jig, which is indexed to each position corresponding to each working head 11, is machined by each working head 11. In addition, by arranging the paired working units 10 to hold the jig drum 3 therebetween, both sides of the works can be machined.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool that indexes a plurality of workpieces and sequentially performs required processing on them.

0002

[Prior Art] Conventionally, as seen in Japanese Patent Publication No. 57-5662, this type of machine tool is equipped with a turntable on which a plurality of workpieces can be placed at intervals in the circumferential direction. It is known that a plurality of workpieces are index-rotated so that they are located at a plurality of processing stations around the circumference, and the workpieces are subjected to predetermined processing using processing machines arranged at each processing station.

0003

In the above-mentioned machine, since a plurality of machining stations are distributed around the turntable, the entire machine tool becomes large and the space efficiency becomes poor. Furthermore, it is not possible to process the back side of the workpiece that faces inward in the radial direction of the turntable, making it unsuitable for processing both sides of the workpiece.

[0004] In view of the above points, an object of the present invention is to provide a small machine tool that is capable of indexing a plurality of workpieces and sequentially performing required machining on the workpieces, and that is also capable of double-sided machining. .

[0005]

[Means for solving the problem] In order to achieve the above purpose,
The present invention includes a rotating shaft that is supported across a pair of bearing columns erected on a base, and a jig for holding a workpiece is installed at an interval in the circumferential direction at an intermediate portion of the rotating shaft. An indexing device is provided for indexing and rotating the rotating shaft so that the jigs are located at a plurality of index positions in the circumferential direction, and a plurality of jig drums are attached to the rotating shaft. Then, a machining unit that moves forward and backward in the axial direction toward the jig drum is extrapolated so as not to rotate along with the rotation axis, and the workpiece is machined by aligning the outer periphery of the machining unit with the plurality of index positions. It is characterized by being equipped with multiple processing heads.

[0006]

[Operation] When each jig on the outer periphery of the jig drum is indexed to each index position by index rotation of the rotary shaft, the processing unit is advanced toward the jig drum, and each processing head on the outer periphery of the processing unit corresponds to the respective index position. Machining the workpiece on the jig located at the index position. After machining, the machining unit is moved backwards, the rotary axis is index-rotated to move each jig to the next index position, the machining unit is moved forward again to perform the next machining on the workpiece, and this process is repeated to machine the workpiece. Perform multiple types of processing.

When the machining unit moves forward, a machining reaction force acts on the machining unit via each machining head, but unlike when the machining head is provided on one side of the periphery of the machining unit, the reaction force from each machining head acts on the machining unit. acts evenly around the machining unit, preventing the machining unit from tilting. Therefore, the machining unit can be stably advanced and machining can be performed with high precision and high speed.

[0008] Also, the processing unit is sandwiched between the jig drum and
If provided in pairs, the machining head on the machining unit on one side of the jig drum can process one side of the workpiece, and the machining head on the machining unit on the other side can process the other side of the workpiece. Can be done.

By the way, the machining unit may be moved forward and backward by a drive source provided on the base, but it is also possible to have a cylinder barrel on the inner periphery of the machining unit, and a piston that fits inside the cylinder barrel on the outer periphery of the rotating shaft. If the cylinder barrel and piston constitute a cylinder for advancing and retracting the machining unit, the drive source can be installed coaxially with the rotation axis to reduce the size of the device, and each machining head can be can equalize the propulsion force of
It's advantageous. The processing unit is prevented from rotating by being engaged with a guide member on the base so as to be slidable in the axial direction.

0010

[Example] Referring to FIGS. 1 and 2, 1 indicates a base;
A pair of bearing columns 2, 2 are erected on the base 1, and a rotating shaft 4 with a jig drum 3 interposed in the middle is supported by both bearing columns 2, 2 at both ends. As shown in FIG. 3, a plurality of jigs 5 for holding workpieces W are attached to the outer periphery of the tool drum 3 at intervals in the circumferential direction, and an indexing device 6 with a rotating shaft 4 connected to one end of the jigs 5 is used to hold the workpieces W. These jigs 5 are rotated at the same pitch as the arrangement pitch of 5.
are respectively indexed at a plurality of index positions in the circumferential direction, and are moved to the next index position each time the index rotates.

The indexing device 6 includes a Geneva gear 7 fixed to one end of the rotating shaft 4, and a roller 8a engaged with the Geneva gear 7.
Geneva arm 8 with attached
and a motor 9 that rotates through the Geneva arm 8, so that one rotation of the Geneva arm 8 imparts one pitch of index rotation to the rotary shaft 4 through the Geneva gear 7.

A pair of machining units 10, 10 facing each other with the jig drum 3 in between are inserted into the rotation shaft 4, and a plurality of index positions are provided on the outer periphery of each machining unit 10. Attach a plurality of matching processing heads 11,
The spindle 11a provided in each processing head 11 is driven by a motor 11b mounted on the outer surface thereof, and the work W is subjected to required processing using a tool such as a drill attached to the spindle 11a. Each processing unit 10 is prevented from rotating by being slidably engaged with a guide bar 12 stretched over the base 1 in the axial direction so as not to rotate together with the rotation shaft 4. A cylinder barrel 13 is fixed to the inner periphery, and a piston 14 that fits inside the cylinder barrel 13 is fixed to the outer periphery of the rotation shaft 4.
3 and the piston 14 constitute a cylinder for advancing and retracting the processing unit 10, and a rotary joint 1 is attached to the end of the rotating shaft 4 opposite to the connecting end to the indexing device 6.
5, pressure oil is supplied into the cylinder barrel 13 of each processing unit 10, and each processing unit 10 is moved forward and backward in the axial direction toward the jig drum 3 by the movement of the cylinder barrel 13 relative to the rotation shaft 4. did. Also, processing unit 10
A positioning pin 16 and a positioning hole 17 are provided on the opposing surfaces of the jig drum 3, and when the processing unit 10 moves forward, the pin 16
is fitted into the hole 17 to perform final indexing of the jig drum 3 based on the processing unit 10.

According to the above structure, after index rotation of the rotary shaft 4, both machining units 10, 10 are advanced toward the jig drum 3 side, and the jig 5 on the indexed position is moved forward to the jig drum 3 side. Each processing head 11, 1 corresponding to each index position on both processing units 10, 10 is placed on the workpiece W.
1 enables double-sided processing.

When the machining unit 10 moves forward, the machining heads 11 around it receive the propulsive force acting on the center of the machining unit 10 evenly and are sent toward the workpiece W, and the machining reaction force is also distributed evenly around the machining unit 10. As a result, the machining unit 10 is stably advanced without tilting, making it possible to perform machining with high precision and high speed.

Further, in this embodiment, a processing machine 18 for diagonal hole machining is mounted on the rear side of the base 1, and the workpiece W on the jig 5 indexed to the backward index position is radially outwardly A diagonal hole is machined on the side surface by the processing machine 18, and thus the workpiece W
It is now possible to perform three-sided machining on both axial sides and the outer side. Note that the workpiece W is attached to and detached from the jig 5 at an appropriate index position facing forward or upward.

When the workpiece W is a small item, as shown in FIG.
It is also possible to set the workpieces W on one side and the other side in the axial direction and process the workpieces W on the one side and the other side with the processing heads 11 of the processing units 10 on the one side and the other side. The number of jigs 5 provided on the jig drum 3 can be arbitrarily set depending on the size of the workpiece and the like.

[0017]

As is clear from the above description, according to the invention of claim 1, a plurality of jigs and a plurality of machining heads can be compactly arranged around a rotation axis,
In addition to reducing the size of the entire device and improving space efficiency, it is also possible to process multiple workpieces using multiple processing heads by advancing a common processing unit, compared to machines that process each workpiece individually. The structure is simplified, and the processing reaction force acts evenly around the processing unit through each processing head, allowing the processing head to move forward stably, enabling high-precision, high-speed processing. It has the effect of

Furthermore, according to the invention of claim 2, it is possible to process both sides of the workpiece, and according to the invention of claim 3, the drive source for advancing and retracting the processing unit is incorporated on the rotating shaft to operate the device. This has the effect of further downsizing and propelling each processing head with equal force.

[Brief explanation of the drawing]

FIG. 1: Partially cutaway side view of an example of implementation of the present invention.

[Figure 2]
its floor plan

[Figure 3] Sectional view taken along line III-III in Figure 1

[Fig. 4] Side view of main parts of another embodiment

[Explanation of symbols]

1 Base, 2 Bearing column, 3 Jig drum, 4 Rotating shaft, 5 Jig, 6
Index device, 10 Processing unit, 11
Processing head, 12 Guide bar (guide member), 1
3 cylinder barrel, 14 piston

Claims (3)

[Claims] Claim 1: A rotating shaft is provided which is supported across a pair of bearing columns erected on a base, and at an intermediate portion of the rotating shaft,
A jig drum is provided in which a plurality of jigs for holding a workpiece are mounted at intervals in the circumferential direction, and the rotating shaft is indexed so that each of these jigs is located at a plurality of index positions in the circumferential direction. An indexing device for rotation is provided, and a machining unit that is moved back and forth in the axial direction toward the jig drum is inserted onto the rotary shaft so as not to rotate along with the rotary shaft, and the above-mentioned A machine tool characterized by being equipped with a plurality of processing heads that process a workpiece in accordance with a plurality of index positions. 2. The machine tool according to claim 1, wherein a pair of said machining units are provided sandwiching said jig drum. 3. The processing unit is slidably engaged in the axial direction with a guide member fixed to the base to prevent rotation, and a cylinder barrel is provided on the inner periphery of the processing unit, and a cylinder barrel is provided on the inner periphery of the processing unit, and a cylinder barrel is provided on the inner periphery of the processing unit. 3. The machine tool according to claim 1, further comprising a piston fixed to the outer periphery of the cylinder barrel to be fitted into the cylinder barrel, and the cylinder barrel and the piston forming a cylinder for advancing and retracting the machining unit.