JPS63102807A - Multi-spindle exchange type machine tool - Google Patents

Abstract

PURPOSE:To make it possible to increase the storage capacity of multi-spindle heads, by providing an elevator coupled to elevating rails in respective groups, and an elevation drive means coupled to this elevator so that the mechanism of delivery to and from an elevating mechanism is simplified. CONSTITUTION:There are provided an elevator 62 coupled to elevating rails 10, 18 in first and second guide rails 5, 6 and an elevation drive means 63 coupled to the elevator 62. Further, the elevator 62 is driven for elevation to move a multi-spindle head between the first and second guide rails 5, 6. Further, when an elevating rail 10 in the first guide rail 5 is moved toward the second guide rail 6, one of multi-spindle heads stored on the second guide rail 6 is retracted outward, and therefore, the first and second guide rails may store thereon an equal number of multi-spindle head. Accordingly it is possible to increase the storage capacity of multi-spindle heads, and to simplify the arrangement for exchange motion of multi-spindle heads.

Description

Detailed Description of the Invention A1 Object of the Invention (1) Industrial Field of Application The present invention provides a processing unit in which a processing unit is disposed on a base so as to be able to move back and forth between an original position and a processing position, and is integrated with the processing unit. The movable rail and the fixed rail constitute a first annular guide rail that surrounds the machining unit in the original position, and a second annular guide coaxial with the first guide rail at a position shifted from the first guide rail in the axial direction. A rail is arranged, and a plurality of multi-axis heads are movably supported on each of the first and second guide rails,
First and second index mechanisms for driving angular displacement of the multi-axis heads on the first and second guide rails are connected to each other in a detachable manner, and the multi-axis heads are connected to each of the multi-axis heads at a position offset from the movable rail. The present invention relates to a multi-spindle head exchangeable machine tool in which an elevating mechanism for exchanging multi-spindle heads between the first and second guide rails is disposed on the sides of the first and second guide rails.

(2) Conventional technology Conventionally, such multi-axis exchangeable head machine tools
It is known from the publication No. 13923.

(3) Problems to be Solved by the Invention However, the above-mentioned conventional system requires a lift mechanism or a shift mechanism to transfer the multi-axis head between the first and second guide rails and the lifting mechanism. , and the configuration is complicated. Furthermore, it is necessary to reserve empty space on the second guide rail for exchanging multi-axis heads, and the amount of multi-axis heads stored is correspondingly small.

The present invention has been made in view of the above circumstances, and the bridge between the first and second guide rails and the lifting mechanism simplifies the mechanism for passing and increases the storage capacity of the multi-axis head. The purpose of this invention is to provide a multi-axis exchangeable head machine tool.

B0 Structure of the Invention (Means for Solving Problems 11) According to the present invention, the first guide rail and the second guide rail are arranged in pairs vertically with the same interval, and correspond to the lifting mechanism. A part of the fixed rail of each first guide rail and a part of each second guide rail are each a pair of 21JI.
The elevator rails of each set are divided into arc shapes, and each pair of elevator rails is integrally connected by a rail support, and the elevator mechanism is movable up and down along a guide column extending up and down. It includes an elevating body connected to the elevating rail, and an elevating drive means connected to the elevating body to move the elevating rail of the first guide rail up and down between the first and second guide rails.

(2) Function When replacing a multi-axis head, bring any multi-axis head on the first guide rail to the position of the lifting rail using the first index mechanism, and move the lifting rail of the first and second guide rails to the position of the lifting rail. It is raised and lowered by a lifting mechanism. When the elevating rail of the first guide rail comes to the position corresponding to the second guide rail, the second indexing mechanism brings the multi-axis head to be newly supplied to the elevating rail, and the elevating mechanism moves it up and down. A multi-axis head is provided on the first guide rail. In addition, the first and second guide rails are arranged in pairs vertically at the same distance in order to stably support the multi-axis head, and two sets of elevating and lowering rails are integrated with the rail support. The rails work together to move up and down.

(3) Example Hereinafter, an example of the present invention will be explained with reference to the drawings. First, in FIGS. 1 and 2, on the base 1 fixed to the floor, there is an original HP and , a processing unit 2 is disposed such that it can freely move forward and backward between the processing position MP at the side end. That is, a pair of parallel advancing/retracting guide members 3 are arranged on the base l, and the processing unit 2 is guided by the advancing/retracting guide members 3 to move between the original position HP and the processing position M.
Move forward and backward between P. Further, a moving motor 4 is fixedly supported on the base 1.
is connected to the processing unit 2.

A pair of upper and lower annular first guide rails 5°5 are arranged so as to surround the processing unit 2 at the original position HP,
The upper position of the first guide rail 5.5 has the first vertical interval.
A pair of upper and lower annular second rails that are the same as the guide rails 5, 5
A guide rail 6.6 is arranged. Moreover, the first and second
The center position and radius of the guide rails 5.5; 6.6 are set to be the same.

Referring to FIGS. 3 and 4 together, the first guide rail 5 is configured in an annular shape by a movable rail 7, a pair of fixed rails 8.9, and a lifting rail 10. The movable rail 7 is
It is placed in the part corresponding to the processing position MP, and the lifting rail 1
0 is arranged on the opposite side of the movable rail 7 with respect to the center of the first guide rail 5. Movable rail 7 and lifting rail 10
For example, the fixed rail 8.9 is 11
It is formed in an arc shape with a central angle of 5 degrees, and the base 1
Fixed. That is, the fixed rails 8 and 9 of the lower first X inner rail 5 are each fixed on the base 1 via the leg members 11, and the upper and lower pair of fixed rails 8.8 and 9.9 are arranged in an arc shape. They are each integrated by a curved side plate 12.

In addition, the upper and lower pair of movable rails 7.7 are connected to the processing unit 2.
The processing unit 2 is integrated with the processing unit 2 and moves together with the processing unit 2.

Further, the upper and lower pair of elevating rails 10 and 1α are integrated by a rail support 13.

Horizontal support plates 14 are each integrated into the fixed rails 8°9 of the upper first guide rail 5, and a plurality of supports 1115 extending inward from these support plates 14 allow the upper and lower The lower end of the support column 16 extending to
It is fixed and supported concentrically with the first and second guide rails 5.5 and 6.6.

Referring also to FIG. 5, the second guide rail 6 is configured in an annular shape with a fixed rail 17 and a lifting rail 18.
The elevating rail 18 is formed in an arcuate shape with the same center angle as the elevating rail 10 in the first guide rail 5, and is arranged at a position corresponding to the elevating rail 10.

The fixed rail 17 of the upper second guide rail 6 is fixed to a support plate 19 extending radially outward from the center of the support column 16, and is connected to the upper and lower pair of fixed rails 18.
．． 18 is integrated with a plurality of connecting plates 20 spaced apart in the circumferential direction. Above again.

The lower pair of lifting rails 18.18 is a rail support 21
integrated through.

The first guide rail 5.5 has a plurality of, for example, six types of multi-axis heads AI, A2. A3. Bl, B2 and B3 are movably supported, and a plurality of, for example, six types of multi-axis heads CI are mounted on the second guide rail 6 and 6.

C2, C3, DI, B2. B3 is movably supported. That is, each multi-axis head A1 to A3. B1-B5. C
1-C5, DI-03, a pair of wheels 22 that can be rotated on the upper surfaces of the upper first guide rail 5 and the upper second guide rail 6 are each pivotally supported. A pair of wheels 23 rolling along the inner surfaces of the first and second guide rails 5.6 are respectively pivotally supported, and each of the multi-axis heads A1 to A3. Bl~B3. C1~C3, Di~D3
A pair of wheels 24 are pivoted on the lower part of the guide rails 5.6, respectively, and rotate along the inner and outer surfaces of the lower first and second guide rails 5.6.

Here, each multi-axis head A1 to A3. B1~B3゜C1~C
3. In D1-D3, alphabetic characters A and B.

The reason why C, D and the numbers 1, 2, and 3 are combined to give reference signs is that it is convenient to distinguish and display the corresponding workpieces and processes, and the alphabetical characters A, B.

C and D indicate the type of the corresponding work, and the numbers 1.2
．． 3 indicates a machining process; for example, l indicates drilling, 2 indicates tapping, and 3 indicates reaming.

Multi-axis head A that can run along the first guide rails 5, 5
1-A3. B1 to B3 are driven for angular displacement by the first index mechanism 25, and the multi-axis heads A1 to A3 . B1-B
5 is arranged at a position corresponding to the movable rail 7.7 or the lifting rail 10.10. In addition, the multi-axis heads C1 to C3 can run along the second guide rail 6.6.
, DI-D3 are driven for angular displacement by the second index mechanism 26, and any one of the multi-axis heads C1-C3, DI-D3 is arranged at a position corresponding to the lifting rail 18.18.

The first index mechanism 25 includes a rotary plate 27 that is rotatably supported at the intermediate portion of the support column 16, and extends radially outward from the rotary plate 27 at a plurality of locations, for example, six locations, equally spaced in the circumferential direction. index arm 28 and rotary plate 27
and a drive source 29 for driving the angular displacement. The second index mechanism 26 is basically configured in the same manner as the first index mechanism 25, and includes a rotary plate 30, an index arm 31, and a drive source 32.

The tip of each index arm 2B, 31 is connected to a multi-axis head A1 to A3. Bl~B3. C1-C3 degrees D1-D3 are removably engaged with locking blocks 36 fixedly installed on the upper portions of D1-D3, respectively.

6, 7, and 8, each index arm 2B, 31 has its own multi-axis heads A1-A3. Bl~B3. Approximately U-shaped guide portions 37 that are open to the C1 to C3 and DI-D3 sides are formed, respectively.

This guide section 37 includes each multi-axis head A1 to A3. B1-
B5. A substantially U-shaped engagement member 38 is slidably engaged with C1 to C3 and D1 to D3 so as to be able to approach and separate from them. A guide shaft 39 that is inserted into the index arms 28 and 31 is fixed to the retaining member 38, and the guide shaft 39 is surrounded by the index arms 28 and 31 and the engagement member 38.
A spring 40 interposed therebetween allows the engaging member 38 to connect to each of the multi-axis heads A1 to A3 . B1-B3. C1-C3, 0i-p
It is elastically biased in a direction approaching 3. Furthermore, a stopper 41 that can be engaged with the index arm 28.31 is fixed at the end of the guide shaft 39 protruding from the index arm 28.31, and the retaining member 38 biased by a spring 40 is Detachment from arm 28.31 is prevented.

Each of the multi-axis heads A1 to A3. B1-B3. Slanted fitting surfaces 42 and 43 are respectively formed so that they approach each other as they move away from C1 to C3 and D1 to D3. In addition, each multi-axis head A1 is provided at the upper center and lower center of the retaining member 38.
~A3. B1-B3. Guide protrusions 44 and 5 protruding toward the Cl-C5 and Di to D3 sides are integrally provided. The distal end surfaces of these guide protrusions 44, 5 include, in order from above, a first guide surface 46.47 that slopes toward the distal end as it goes downward, a second guide surface 48.49 that is vertical, and a second guide surface 48.49 that slopes upward. As the third guide surface 50.51 slopes toward the tip side, a third guide surface 50.51 is formed.

On the other hand, each multi-axis head A1 to A3. B1~B3゜C1~C
3. At the top of DI to D3, there is an index arm 28,
A locking block 36 protruding toward the 31 side is fixedly provided. The locking block 36 has the inclined fitting surface 42.
The outer surfaces 52 and 53 corresponding to the outer surfaces 52 and 53 are formed so as to be inclined toward each other toward the distal end side. Also,
At the tip of the locking block 36, there is a first contact surface 54 inclined corresponding to the third guide surfaces so and st, and a second guide surface 48 .
49, a vertical second contact surface 55, and a first guide surface 4.
A third contact surface 56 inclined corresponding to 6.47 is provided in order from above.

According to the tip structure of the index arms 2B, 31 and the structure of the locking block 36, the outer surface 52.5
3 is brought into contact with the inclined fitting surfaces 42 and 43, and the third contact surface 56 is brought into contact with the first guide surface 47.
6 and the retaining member 38 are engaged, the locking block 36, that is, each of the multi-axis heads A1 to A3. Bl~B3.
When C1 to C3 and DI to D3 are raised, the first contact surface 5
4 comes into contact with the third guide surface 50, and the engagement member 38 engages the spring 40.
The outer surfaces 52, 53 and the inclined fitting surfaces 42, 43 are separated from each other to release the engaged state. Also, from below the index arm 28°31, a locking block 36, that is, each multi-axis head A1 to A3. Bl~B3
．． When C1 to C3 and DI-D3 rise, the first contact surface 54 comes into contact with the third guide surface 51 of the retaining member 38 which is resiliently biased by the spring 40, and the engaging member 38 is pushed in. Next, when the third contact surface 56 rises to a position corresponding to the first guide surface 47, the retaining member 38 moves forward until the first guide surface 47 contacts the third contact surface 56, and is locked. Slanted fitting surfaces 42, 4 on both valve sides 52 and 53 of the block 36
3 are in contact with each other, and the index arm 28.31 and the multi-axis head A1~A3°81~B3. C1-G3. DI-D3
becomes a cohesive state. This is for each multi-axis head A1 to A3.
．． B1-B5. The same applies when C1 to C3 and DI to D3 descend from above.

In the part corresponding to the lifting rail 10.10; 18.18,
A lifting mechanism 60 is disposed on the sides of the first and second guide rails 5.5; 6.6.

In FIG. 9, the elevating mechanism 60 includes a pair of guide columns 61.61 extending vertically, a pair of upper and lower elevating bodies 62.62 that can be raised and lowered along the guide columns 61.61, and an elevating body 62.6.
2 is provided.

A board 64 is arranged on the floor on the side of the base l, and guide columns 61°61, each having a cylindrical shape with a rectangular cross section, are erected on the board 64 with intervals between them. Ru. Also, guide pillar 6
1.61 are connected to each other by a connecting plate 65, and this connecting plate 65 and the base 1 are connected to each other by a pair of connecting members 66°66 made of section steel. Further, the upper portions of the guide columns 61 and 61 are connected to each other by a connecting plate 67.

Further, on the upper part of the guide column 61.61, a bracket 68.68 is fixedly attached to the side surface of the side facing away from each other, and the bracket 68.68 has a connecting member 69 made of, for example, I-beam steel.
．． One end of 69 is fixed. These connecting members 69.6
The other end of the support column 9 is commonly fixed to the upper end of the support column 16 .

In this way, the guide column 61.61 is substantially integrated with the base 1 at its upper and lower portions and is stably supported.

Elevating guide members 70.70 extending vertically are fixed to the side surface of the guide column 61.61 on the base side, and the elevating body 62.62 ascends and descends along these guide members 70.70. . In other words, both elevating bodies 62.62 are connected to both guide columns 61.
．． A horizontal plate 72.72 extending toward the base L side is fixed at right angles to the lower part of the vertical plate 71.71 spanning between 61 and 61,
A pair of fitting leg portions 73.73 that fit into the guide members 70.70 are provided at each end of the vertical plate 71.71.

Both elevating bodies 62.62 are connected to each other via a connecting member 74, and an elevating drive means 63 is connected to the upper elevating body 62.
are concatenated. This elevating/lowering driving means 63 is, for example, a hydraulic cylinder, extends in the vertical direction, and is supported by one guide column 61 . Therefore, both the elevating bodies 62.62 are driven up and down by the elevating drive means 63 along the guide members 70.70.

At the upper ends of both guide columns 61.61, a pair of sprocket wheels 76.76 share a common shaft 75 so as to rotate synchronously.
are pivotally supported, and these sprocket wheels 76.
One ends of the chenos 77 and 77 wrapped around 76 are respectively connected to the upper elevating body 62. Also Cheno 77,7
The other end of 7 is inserted into the guide column 61.61 from the upper end and is connected to a balance weight 78.78 that can be moved up and down within the guide column 61.61.

Each sprocket wheel 76.76, guide column 61.6
1 is covered with a cover 79.79 attached to the upper end of the 1.

Further, the lower end of the guide member 70.70 is provided with a lower elevating body 6.
A stopper 80 is attached to each guide member 70.7 to determine the lower limit position of each elevating body 62.
At the upper end of 0, each elevating object 6 is placed in contact with the elevating object 62 above.
A stopper 81 defining an upper limit position of 2.62 is attached to each.

, both elevating bodies 62°62 in a state connected by the connecting member 74
The spacing between the horizontal plates 72.72 in corresponds to the spacing between the lower first guide rail 5 and the lower second guide rail 6, and the horizontal plates 72.72 of both lifting bodies 62.62 are ,
It is connected to lifting rails 10.18 on the lower first and second guide rails 5.6, respectively. Therefore, as the elevating bodies 62, 62 move up and down, the elevating rails 10, 10i1
8°18, but when the elevating body 62.62 is at the lower limit position, the elevating rail 10.10 is moved up and down by the first guide rail 5.
．． 5 and the lifting rail 18.1
8 is in a position corresponding to the second guide rail 6.6 and the lifting body 62.62 is in the upper limit position, as shown in FIG.
The upper and lower limit positions of the elevating body 62.62, that is, the mounting position of the stopper 80.81 are set so as to be at the position corresponding to 6.

11 and 12, the lifting rail 10.1
A pair of support guides 82.82; 83, 8 extend vertically with an interval larger than the width of the locking block 36 on the rail sabot 13.21 that connects 0i1B and 1B.
3 are fixedly installed respectively. Also, support guide 82.
The guide rods 84 and 84 that are in sliding contact with the first guide rail 5
．． A guide rod 85 extends vertically between 5 and 5, is fixed to the support plate 14, and slides in contact with the support guides 82, 82i83, 83.
, 85 extend vertically between the second guide rails 6.6 and are fixed to the support plate 19. This stabilizes the elevating and lowering operations of the elevating bodies 62 and 62.

Between the index arms 28.31 located at positions corresponding to the lifting rails 10.18, the multi-axis head At-A3. B1-B3. C1-C3
, Di-D3 extends vertically and is fixed to the support plate 19, and a head guide member 87 extending vertically above the index arm 31 is fixed to the connecting member 69. These head guide members 8
6.87, the locking block 36, that is, each multi-axis head A1 to A3. B1-B3. Elevating and lowering operations of C1 to C3 and D1 to D3 are stabilized.

Referring again to FIG. 4, the support plate 14, which is integral with the fixed rail 8.9 of the upper first guide rail 5, has multi-axis heads A1 to A3. Bl~B3, C1~C3, Di~D3
Detectors 88 and 89 are installed to detect the type of each multi-axis head A1 to A3. Bl~B3. Cl-
A transmitter 91 for transmitting a signal according to the type when facing the detectors 88, 89 is attached to each of C5°D1 to D3.

Further, in FIG. 5, a support plate 19 integral with the fixed rail 17 of the upper second guide rail 6 has a multi-axis head AlNA 3 located at a position corresponding to the elevating rail 18. B1
~B3. Detectors 90 for receiving signals are mounted opposite to the transmitters 91 of C1 to C3 and Di to D3, respectively.

In FIG. 13, the multi-axis interchangeable head machine tool M configured as described above is designed to machine multiple types, for example, four types of workpieces WA, WB, WC, and WD, which are intermittently conveyed, from both sides. A plurality of processing stations, for example, five processing stations SL, S2. S3゜S4. One pair each is arranged in S5. That is, the conveyor 95 is arranged in an endless manner so as to sequentially pass through the processing stations 81 to S5.
The machine tools M are arranged on both sides of the conveyor 950 at positions corresponding to the respective processing stations S1 to S5.

A plurality of pallets 96 are placed on the conveyor 95, and one of the plurality of types of workpieces WA, WB, WC, WD is placed on the pallet at the input station S1 set at a fixed position before entering each processing station 5INS5. It will be posted on 96. Further, a payout station SO is set at a fixed position after passing through each processing station 5t-S5, and the workpieces WA, WB, WC, and WD processed at each processing station S1 to S5 are placed at the payout station SO.
It is dispensed from the pallet 96. Moreover, the pallet 96 after being delivered is circulated to the input station Si.

At the input station St, there are works WA and WB.

A workpiece detector 97 is provided to detect which of the WC and WD is input, and a signal detected by this workpiece detector 97 is input to an overall control panel 98. On the other hand, each machine tool M has a sequencer 99 and a CNC device 10.
0 is attached to each of them, and the type of workpiece input to the input station Si is transmitted from the general control panel 98 to each sequencer 99.

In each machine tool M, a signal from a transmitter 91 is read by a detector 89.90, so that multi-axis heads A1 to A3.
Bl~B3. It is detected whether any of C1 to C3 and D1 to D3 is engaged, and the data is stored in the sequencer 99. A multi-axis head read command and a machining command signal are inputted from the CNC device 100 to the sequencer 99, and by comparison with data stored in the sequencer 99, a desired multi-axis head is moved to a machining position MP. At this time, if the desired multi-axis head is on the second guide rail 5.5, it is moved to the processing position MP by the operation of only the first index mechanism 25, but the desired multi-axis head is on the second guide rail 5.5. When on the guide rail 6.6, the desired multi-axis head is lowered onto the first guide rails 5, 5 by the action of the lifting mechanism 60 and the second index mechanism 26, and further moved to the processing position by the first index mechanism 25. He is forced to move to MP.

Further, from the general control panel 98, the type of workpiece, the number of stations and the number of processes from the input stage Jin Si to the relevant station are manually inputted to the sequencer 99 as standard commands, and the preparation command signal and the sequencer 99 are input manually.
A multi-axis head to be prepared is searched for by comparison with the data stored in the sequencer 99, and the multi-axis heads to be prepared are sequentially moved to the first guide rail 5.5 by commands from the sequencer 99.

Next, the operation of this embodiment will be explained with reference to FIG. 14. In a machine tool M consisting of, for example, a workpiece W
A, WB, WC, WD are delivered in this order, and each work WA, WB.

When performing three steps of drilling, tapping, and reaming in order for WC and WD, Fig.
1, on the first guide rail 5.5 there is a multi-axis head Al-A3. Bl to B3 are arranged in order, and multi-axis heads C1 to C3 and Di to D3 are arranged on the second guide rail 6.6.
Assume that they are arranged in order.

In this case, after bringing the multi-axis head Al to the processing position MP and drilling the workpiece WA, the multi-axis head A2
．． A3 is sequentially brought to the processing position MP, and tapping and reaming are sequentially performed.

After that, as the workpiece WB is transported, the machining position fiM is adjusted to the multi-axis Rad Bl as shown in FIG.
Bring it to P and perform drilling. At this time, the next workpiece WC to be transported is the corresponding multi-axis head C1, C.
2. Since C3 is on the second guide rail 6.6, the multi-axis head C1 is moved from the second guide rail 6.6 to the second guide rail 5.5 during processing by the multi-axis Rad B1. let

That is, the multi-axis head Am D3 located at the position corresponding to the lifting rails 10, 10; 18, 18 is
As shown at 1, the lifting mechanism 60 raises it to the upper limit position. As a result, the multi-axis head A1 rises to a position corresponding to the second guide rail 6.6, and the multi-axis head D3 retreats upward from the second guide rail 6.6. At this time, the data of the evacuated multi-axis head D3 is deleted from the sequencer 99, and the data from the transmitter 91 of the multi-axis head AI is read by the detector 90. Axial head A1
The relationship is newly stored in the sequencer 99.

Next, as shown in FIG. 14+d), the second index mechanism 26 moves the multi-axis heads C1-C5°Di, D2
．． AI moves clockwise along the second guide rail 6.
The angular displacement is driven by 0 degrees. For this reason, the multi-axis head C1
comes to a position corresponding to the lifting rail 18.18.

Therefore, as shown in FIG. 14 (el), the elevating mechanism 60 is lowered to lower the multi-axis head D3 to a position corresponding to the second guide rail 6.
is lowered to a position corresponding to the first guide rail 5.5. At this time, the multi-axis head D3 and the second index mechanism 26
The relationship with the index arm 31 is stored anew in the sequencer 99, and within the sequencer 99, the second
The data of the multi-axis head C1 corresponding to the index mechanism 26 is stored in association with the index arm 28 of the first index mechanism 25.

Such operation is performed by the multi-axis head B2. The machining operation by the multi-axis head B3 is performed in the same manner, and the multi-axis head C2 is lowered from the second guide rail 6.6 to the first guide rail 5.5, and the multi-axis head C2 is lowered from the second guide rail 6.6 to the first guide rail 5.5. When machining with
from there onto the first guide rail 5.5. Moreover, in place of multi-axis heads C2 and C3, multi-axis head A2. A
3 is moved from the first guide rails 5,5 to the second guide rails 6.6.

Therefore, when the workpiece WC is transported after processing the workpiece WB, the multi-axis heads C1, C2, C3 are sequentially brought to the processing position MP, and the multi-axis heads CI, 02, 02, . C
3 can be performed in sequence.

During processing using such multi-axis heads C1, C2, C3, the multi-axis heads DI, D2. D3 is lowered from the second guide rail 6.6 onto the first guide rail 5,5.

For example, during processing using the multi-axis head C2, the multi-axis head D2 is lowered onto the first guide rail 5.5, as shown in FIG.
．． At 6, the multi-axis head D3 is located above the multi-axis head D2.

Therefore, when the first index mechanism 25 is activated to bring the multi-axis head C3 to the machining position MP after the machining by the multi-axis head C2 is completed, the second index mechanism 26 is also activated as shown in FIG. Then, the multi-axis head D3 is angularly displaced by 60 degrees.

Advance the multi-axis head C3 to the processing position iJMP and move the workpiece W.
When machining C, the elevating mechanism 60 is operated to raise and lower the multi-axis head B3 to the second position as shown in FIG. 14(h).
It is raised to the guide rail 6.6, and the multi-axis head AI is retracted upward from the second guide rail 6.6.

Thereafter, as shown in FIG. 14 (11), move the second index mechanism 26 in the direction opposite to that shown in FIG.
Operate only 0 degrees and move the multi-axis head D3 to the lifting rail 10.
Put it on 10.

By lowering the elevating mechanism 60 in this state, the multi-axis head D3 is moved to the first position as shown in FIG. 14(J).
It can be lowered onto the guide rails 5,5.

In this way, each multi-axis head A1 to A3. B1~B3
．． Since C1 to C3 and DI to D3 can be arbitrarily brought to the processing position MP and processed, and the multi-axis head can be prepared and arranged in preparation for the next processing, processing efficiency is improved. In addition, the first and second guide rails 5, 5; 6
, 6 can store the same number of multi-axis heads, so it is possible to store a larger number of multi-axis heads than the conventional one.

In the lifting mechanism 60, the guide column 61.61 is connected to the connecting member 66.6.
6; Since it is substantially integrated with the base 1 at 69.69, it becomes possible to stably support the vertical state of the guide column 61.61. Furthermore, when the lifting mechanism 60 is operated to raise and lower, the rail support 13 that connects the lifting rails 10.10 and the rail support 21 that connects the lifting rails 18.18,
Guided by guide rods 84.84; 85.85, the multi-axis head AlNA3. Bl~B3. Since the locking blocks 36 of C1-C3, DI-D3 are guided by the head guide members 86, 87, the multi-axis heads A1-A3. B1-B3. C1~
C3, DI to D3 move up and down stably. Further, a pair of upper and lower elevating bodies 62.62 are connected by a connecting member 74, and a sprocket wheel 7 in which a pair of chinos 77, 77 connected to the upper elevating body 62 is pivotally supported on the upper end of the guide column 61°61.
At the same time as wrapping around 6°76, those chenos are 77°7.
Since the balance weight 78.78 is connected to 7, the lifting body 62.62 can stably move up and down while maintaining its horizontal position, and can be driven by a single lifting drive means 63. .

In the first and second index mechanisms 25, 26, a substantially U-shaped engagement member 38 is disposed at the tip of each index arm 28, 31 and resiliently biased in a direction protruding from the tip.
Guide protrusions 44 and 5 are provided at the upper and lower center of the retaining member 38.
In addition, since the tip of the locking block 36 is formed to correspond to the guide protrusions 44 and 45, each multi-axis head Al
-A3°B1~B3. The locking block 36 and the index arm 28.
31 can be easily engaged and disengaged, and the engaged state can be firmly maintained.

C0 Effects of the Invention As described above, according to the present invention, a part of the fixed rail of the first guide rail and a part of the second guide rail are each divided into circular arc shapes in the part corresponding to the elevating mechanism as the elevating rail. The elevating mechanism includes an elevating body that is movable up and down along a guide column extending vertically and is connected to the elevating rails of the first and second guide rails, and an elevating body that connects the elevating rails of the first guide rail to the elevating rails of the first and second guide rails. The multi-axis head can be moved between the first and second guide rails by driving the elevator up and down by driving the elevator up and down. When the elevating rail of the first guide rail moves to the second guide rail, one multi-axis head stored in the second guide rail is retracted outward, so that The same number of multi-axis heads can be stored, increasing the storage capacity of multi-axis heads and simplifying the configuration for replacement and movement compared to conventional systems.

Moreover, the first stabilizing rail and the second guide rail are arranged in pairs vertically with the same spacing, and two sets of elevating rails are integrated with a rail support, making the multi-axis head stable. The two sets of lifting rails can be moved up and down in conjunction with each other.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall perspective view of an exchangeable machine tool with a multi-axis head, and FIG. 2 is a simplified exploded perspective view with the multi-axis head of FIG. 1 removed. , Fig. 3 is a simplified partial cutaway side view seen from the direction of the arrow ■ in Fig. 1, Fig. 4 is a cross-sectional view taken along the line ■-■ in Fig. 3, and Fig. 5 is a cross-sectional view taken along the line ■ arrow in Fig. 3. Fig. 6 is a large sectional view taken along the vr-vr line in Fig. 4. Fig. 7 is a view from the ■ arrow in Fig. 6. Fig. 8 is a view of Fig. 7 with the locking block removed. Fig. 9 is a view from the ■ arrow in Fig. 3, Fig. 10 is a side view corresponding to Fig. 3 when the elevating mechanism is raised, and Fig. 11 is a view from XI-XI&'il in Fig. 3. , Fig. 12 is a sectional view taken along line xi-x in Fig. 3, Fig. 13 is a simplified diagram showing an example of the arrangement of a multi-spindle head exchangeable machine tool, and Fig. 14 sequentially explains the multi-spindle head exchange operation. FIG. 1... Base, 2... Processing unit, 5... First guide rail, 6... Second guide rail, 7... Movable rail, 8°9... Fixed rail, 10. 18... Elevating rail, 13° 21... Rail support, 25... First index mechanism, 26... Second index mechanism, 60... Elevating mechanism, 61... Guide column, 62...・・・
Lifting body, 63... Lifting drive means, A1 to A3. Bl~B3. C1~C3, DI~D3...
・Multi-axis head, HP...Original position, MP...Processing position Fig. 12 1111 Fig. 14 (il (j) Mouth

Claims (1)

[Claims] A machining unit is arranged on a base so as to be able to move forward and backward between the original position and the machining position, and a first annular ring surrounding the machining unit in the original position is provided with a movable rail and a fixed rail that are integral with the machining unit. A guide rail is constructed, and a second guide rail is disposed coaxially and annularly at a position shifted in the axial direction from the first guide rail, and each of the first and second guide rails has a plurality of multi-axis heads. First and second index mechanisms for driving angular displacement of the multi-axis heads, which are movably supported on the first and second guide rails, are detachably coupled to each of the multi-axis heads, and the movable rails are movable. On the side of the first and second guide rails at the shifted position, there is a first guide rail.
In a multi-spindle head exchangeable machine tool equipped with a lifting mechanism for exchanging multi-spindle heads between the second guide rails, the first guide rail and the second guide rail are spaced vertically at the same distance. The fixed rails of each first guide rail and the part of each second guide rail are arranged in pairs with a gap between each other, and in the part corresponding to the lifting mechanism, a part of the fixed rail of each first guide rail and a part of each second guide rail are arranged in an arc shape as two pairs of lifting rails. Each pair of lifting rails is divided into pairs and connected together by a rail support, and the lifting mechanism includes an lifting body that is movable up and down along a guide column that extends up and down and is connected to each set of lifting rails. and,
A multi-spindle head exchangeable machine tool, comprising: an elevating drive means connected to an elevating body for elevating the elevating rail of the first guide rail between the first and second guide rails.