JPH0367809B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Object of the Invention (1) Industrial Application Field The present invention is intended for supporting a workpiece having a hole to be bored over a relatively long distance in the axial direction, such as a crankshaft. Boring of engine cylinder blocks with multiple concentric bearing holes spaced apart from each other, and engine cylinder heads with multiple bearing holes spaced concentrically apart for supporting camshafts. Regarding equipment.

(2) Prior Art Conventionally, when boring such a workpiece, as disclosed in Utility Model Publication No. 58-11458, the workpiece is placed with the axis of the hole to be bored in a horizontal state. The supported and horizontal boring bar is moved horizontally to perform machining.

(3) Problems to be Solved by the Invention In the above conventional technology, the boring bar is relatively long because the hole to be bored is relatively long in the axial direction, and the boring bar is also relatively long. The portion between the bearings is susceptible to deflection due to its own weight, causing a so-called skipping phenomenon, which may adversely affect machining accuracy. Therefore, the rotational speed of the boring bar has to be kept relatively low.
Processing efficiency was also poor.

Additionally, in the past, it took time to change the boring bar due to changes in the type of workpiece, and it took time to replace the support jig for supporting the boring bar, and when replacing these, it took time to change the boring bar. It was forced to stop operating. In particular, when a boring machine is located in the middle of a series of machining lines, the operation of other machining machines must also be stopped, resulting in a decrease in production efficiency.

Furthermore, when a boring bar is changed in response to a change in the type of workpiece, a worker must check whether the boring bar is properly compatible with the new boring bar, which is a complicated process.

Moreover, although the boring bar is supported by a support jig via a bearing, it is necessary to prevent cutting fluid and chips from entering into the bearing.

The present invention has been made in view of the above circumstances, and improves machining accuracy and machining efficiency by avoiding bending of the boring bar, and also adjusts the boring bar and support jig in response to changes in the workpiece. A boring device that can be easily replaced, quickly confirms whether an appropriate boring bar has been selected, and prevents foreign matter from entering the support part of the boring bar support jig. The purpose is to provide

B. Structure of the Invention (1) Means for Solving Problems The apparatus of the present invention comprises a support that is erected on a fixed base; and a position corresponding to a processing station that is set on the base on the side of the support. a drive mechanism in which a rotary drive motor is disposed on a lifting platform that can be raised and lowered along the pillar; a plurality of rotary drive motors are arranged around the upper part of the pillar and can be selectively fixed to the lower part of the lifting table; and a tool head having a vertical rotating shaft connectable to the rotary drive motor; an indexing mechanism for selectively bringing the tool heads to a position corresponding to the lifting platform; and an upper end removably attachable to the rotating shaft of the tool head. a plurality of connected boring bars; in order to rotatably and slidably support the boring bars, a plurality of boring bars are arranged around the lower part of the column so as to be selectively movable to positions corresponding to the processing station; a support jig; a support tube that defines a downwardly open annular path between the outer surface of the boring bar and is attached to the upper part of each boring bar via a bearing to be supported by the support jig; and; a valve body that is suspended from each of the tool heads and has an insertion hole in which a plurality of annular grooves are provided at intervals in the axial direction; a valve rod, which is provided in each boring bar and has a communication passage communicating with the annular groove, and is insertable into the insertion hole to selectively cut off the annular grooves depending on the type thereof; a detection fluid supply pipe connected to the valve body that communicates with each annular groove individually; a jetting fluid supply pipe connected to the valve body so as to communicate with the communication passage when the valve rod is inserted into the valve body; a head-side fluid manifold that has connection holes individually communicating with each of the fluid supply pipes and is fixed to each tool head; A lifting platform-side fluid manifold provided on the platform and having connection holes individually communicating with each of the connection holes; and between each connection hole corresponding to the detection fluid supply conduit of the lifting platform-side fluid manifold and the fluid supply source. and a pressure switch interposed therein.

(2) Effect The boring bar is suspended from the tool head, and the weight of the boring bar acts in the direction of its axis. This avoids deflection of the boring bar and reduces vibrations and rope-jumping phenomena caused by the deflection. occurrence is prevented. In addition, a plurality of tool heads that support the boring bar are arranged around the pillar, and each tool head is selectively connected to a drive mechanism located at a position corresponding to the processing station, and a plurality of support jigs that support the boring bar are arranged. Multiple supporting jigs are arranged around the support column, and these supporting jigs can be selectively brought to the processing station, making it possible to quickly and easily replace boring bars and supporting jigs in response to changes in the type of workpiece. can be done. Furthermore, when connecting the boring bar to the rotating shaft of the tool head, by inserting a valve rod that individually corresponds to the boring bar into the insertion hole of the valve body, the distance between the annular grooves of the valve body can be selected according to the type of boring bar. is blocked. When the tool head supporting the selected boring bar is connected to the lifting platform of the drive mechanism, fluid is supplied from the fluid supply source to each annular groove according to the connection of the head-side fluid manifold and the lifting platform-side fluid manifold. Depending on the type of boring bar supplied, the annular groove is selectively closed by the valve rod, so that the correctness of the boring bar can be immediately checked by selective actuation of the pressure switch. Furthermore, due to the connection of both fluid manifolds, fluid from the fluid supply source is supplied to the annular path through the communication path in the valve rod, and the fluid is ejected downward from the annular path, thereby preventing foreign matter from entering the bearing. Intrusion is prevented.

(3) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in FIGS. 1 and 2, this boring device 1 has a support 3 erected on a fixed base 2, a drive mechanism 4 that is movable up and down at a position corresponding to the processing station S set on the base 2 on the side of the support column 3; a feed mechanism 5 for driving the drive mechanism 4 up and down; Drive mechanism 4
A plurality of, for example, four tool heads 6 are selectively and removably fixed to the lower part of the tool head, a boring bar 7 whose upper end is removably connected to each tool head 6 and extends downward, and a position corresponding to the boring bar 7, i.e. A plurality of support jigs 8, for example four, are selectively fixed to the lower part of the support column 3 at positions corresponding to the processing station S, and workpieces W carried into the processing station S, for example 5, are spaced apart from each other. Two camshaft bearing holes 1
A workpiece support mechanism 9 for supporting and positioning a cylinder head having a cylinder head 1 concentrically therein, and a transport mechanism 10 for carrying the workpiece W into and out of the processing station S.

The drive mechanism 4 includes a lifting table 12 horizontally arranged above the processing station S so as to extend outward in the radial direction from the support column 3, and a rotary drive motor 13 supported and fixed on the upper surface of the lifting table 12. Equipped with
The rotary drive motor 13 is arranged with its output shaft 14 being vertical, and the output shaft 14 rotatably passes through the lifting table 12 with its lower end protruding downward from the lower surface of the lifting table 12. . Moreover, the lower end of the output shaft 14 is connected to the rotating shaft 54 of the tool head 6.
It has a structure that allows spline connection by fitting from below. Further, this rotary drive motor 13 has a built-in fixed position stop mechanism that allows the cutting tool 63 of the boring bar 7 to always accurately face in the direction opposite to the column 3 while the rotation is stopped.

Referring also to FIG. 3, the feed mechanism 5 includes a threaded rod 15 that is screwed into the lifting platform 12 of the drive mechanism 4 and extends up and down, and a feed motor 16 for rotationally driving the threaded rod 15. . The threaded rod 15 is arranged to extend vertically along the outer surface of the support column 3, and its middle portion is screwed into the screw hole 17 of the lifting table 12. Further, the upper and lower ends of the threaded rod 15 are rotatably supported by the column 3, and the feed motor 16 is connected to the upper end of the threaded rod 15 and is fixed and arranged on the upper portion of the column 3. Moreover, the direction of rotation of the feed motor 16 can be freely switched between forward and reverse directions.

A pair of guide rails 18 extending vertically are fixed in parallel on the outer surface of the support column 3 on both sides of the threaded rod 15.
2 are fitted. Therefore, the lifting platform 12 is prevented from angularly displacing the threaded rod 15 around its axis, and the feed motor 16 operates to move the threaded rod 1
5 moves up and down along both guide rails 18.

Further, a pair of balance cylinders 19 extending vertically are fixed to the upper part of the support column 3 in correspondence with both sides of the lifting table 12, and rods that slide into each balance cylinder 19 are fixed to the lifting table 12. As a result, the lifting platform 12 moves up and down while maintaining a horizontal attitude.

Further, referring to FIG. 4, each tool head 6 connects and supports boring bars 7 of different types so as to correspond to changes in the type of workpiece W, and each tool head 6 connects and supports boring bars 7 at 90 degrees around the support 3. placed at intervals. These tool heads 6 are each supported on a head carrier 22, and by moving the head carrier 22 around the support column 3, any tool head 6 and boring bar 7 can be brought to a position corresponding to the processing station S, that is, the drive mechanism 4. be able to.

On the outer surface of the upper part of the column 3, an upper guide member 23 with a U-shaped cross section that opens downward extends along a virtual circumference centered on the center position of the column 3, excluding the drive mechanism 4. Fixed in an arc shape. Further, at a lower part spaced apart from the upper guide member 23, there is a U-shaped cross section that opens upward, and the upper guide member 23
An arcuate lower guide member 24 corresponding to 3 is fixed to the outer surface of the column 3 by a bracket 25.

On the other hand, when the elevating table 12 in the drive mechanism 4 reaches the predetermined uppermost position,
An upper guide groove 26 connected to the upper guide member 23 and a lower guide groove 27 connected to the lower guide member 24 are provided, and both guide grooves 26 and 27 have the same radius of curvature as the radius of curvature of the upper and lower guide members 23 and 24. It is curved with .

Each head carrier 22 is curved in an arc shape with a radius of curvature corresponding to the upper and lower guide members 23 and 24, and is disposed between the upper and lower guide members 23 and 24. Also, between each head carrier 22, a connecting piece 28 which is curved in an arc like the head carrier 22 is arranged, and each head carrier 22 is connected to the adjacent connecting piece 28, respectively.

That is, connecting arms 29 projecting outward are provided at both circumferential ends of the head carrier 22, and connecting pins 3 are attached to the tips of these connecting arms 29.
0 is planted respectively. On the other hand, a connecting collar 31 is provided on the outer surface of the connecting piece 28 at a position above the connecting arm 29 and protrudes over the entire circumference, and the connecting collar 31 is provided in a connecting hole 32 bored at both ends of the connecting collar 31. By inserting the connecting pin 30 from below, each head carrier 22 and each connecting piece 28 are connected to each other.

The upper part of each head carrier 22 and each connecting piece 2
Sector gears 33 and 34 are fixed to the upper part of the gear 8, respectively, and these sector gears 33 and 34 constitute an internal gear 35 as a whole.

Also, the upper part of the head carrier 22 and the connecting piece 2
8 has an upper guide member 23 and an upper guide groove 26.
A plurality of rollers 36 and 37 that are rotatable inside are each pivotally supported. Furthermore, at the lower part of the head carrier 22 and the lower part of the connecting piece 28, there are a plurality of rollers 3 that can roll within the lower guide member 24 and the lower guide groove 27.
8 and 39, and a plurality of rollers 40 and 41 that can roll on the outer upper edge of the lower guide member 24 and the outer upper edge of the lower guide groove 27 are respectively pivotally supported. As a result, each head carrier 22 and each connecting piece 28 are in a mutually connected state, and the upper and lower guide members 23, 2
4, or in other words, between the upper and lower guide grooves 27, 27, it can move, that is, rotate around the support column 3.

An indexing mechanism 42 is provided to rotate each head carrier 22 and connecting piece 28 in this way to bring any desired head carrier 22 or tool head 6 to the position of the drive mechanism 4. The index mechanism 42 includes an index motor 43, a gear box 44 containing a gear train (not shown) for decelerating and transmitting the drive tail of the index motor 43, and an output shaft 45 of the gear box 44. and a drive gear 46 that is fixed to and meshes with the internal gear 35. A gear box 44 is fixed to the upper part of the support column 3, and an index motor 43 is fixed and supported to the upper part of the gear box 44. The output shaft 45 projects downward from the gear box 44, and a drive gear 46 is fixed to the lower end of the output shaft 44.

According to the index mechanism 42, the internal gear 35, that is, the head carrier 22 and the connecting piece 28 are rotated by the operation of the index motor 43, so that a desired head carrier 22 can be brought below the drive mechanism 4.

The tool heads 6 are respectively supported on the head carriers 22 so as to allow relative upward movement. That is, the head carrier 22 has support arms 47 integrally projecting below each of the connection arms 29, and support pins 48 and 49 are provided upright on each connection arm 29 and each support arm 47, respectively. Ru. On the other hand, the tool head 6 has each of the connecting arms 2
9 and upper and lower arms 5 that can be placed on each support arm 47
0,51 are provided protrudingly, and those arms 50,5
1 is provided with through holes 52 and 53, respectively, through which the support pins 48 and 49 can be inserted. Moreover, the thickness of each arm 50, 51 is determined to be smaller than the length of the support pins 48, 49, so that each arm 50,
The tool head 6 can be moved upwardly relative to the head carrier 22 in such a way that the tool head 51 is moved upwardly away from the connecting arm 29 and the support arm 47.

A rotary shaft 54 whose axis is vertical is supported on the tool head 6 so as to be rotatable around the axis.
Both upper and lower ends of this rotating shaft 54 protrude from the tool head 6. Moreover, the tool head 6 of the rotating shaft 54
When the arms 50 and 51 are placed on the connecting arm 29 and the supporting arm 47, the length of the upward protrusion does not reach the lower end of the output shaft 14 in the drive mechanism 4, and the tool head 6 is raised. When fixed to the drive mechanism 4, the upper end of the rotating shaft 54 is connected to the output shaft 14.
spline connection to the lower end of the

In order to fix the tool head 6 to the drive mechanism 4, a plurality of, for example, four
Two locking members 55 are fixed. These locking members 55 have engagement grooves 56 that are approximately T-shaped in cross section, and are fixed and arranged so that the engagement grooves 56 are along the circumference around the rotation center of the tool head 6. be done. On the other hand, the lifting platform 12 in the drive mechanism 4
Four clamp cylinders 57 are fixed and supported on the upper surface of the holder, corresponding to each of the locking members 55. These clamp cylinders 57 are arranged with their axes being vertical, and their rods 58 movably penetrate the lifting table 12 and protrude below the lifting table 12, and the lower ends of the rods 58 have the respective locking members A substantially T-shaped engaging portion 59 that can be engaged with the locking groove 56 of 55 is provided.

When each clamp cylinder 57 is extended, the engaging portion 59 of each rod 58 is in a position where it can engage with the locking member 55 of the tool head 6 placed on the connecting collar 31 and the support arm 47. By contracting the clamp cylinder 57 with the engaging portion 59 engaged with the locking member 55, the tool head 6 is pulled upward.

Further, on the upper surface of the tool head 6, there are a plurality of tools, for example, four
Four positioning pins 60 are erected, and four fitting cylinders 61 into which each positioning pin 60 can be fitted are fixed to the lower surface of the lifting table 12. Tool head 6
When the tool head 6 is pulled up by the clamp cylinder 57, each positioning pin 60 fits into the fitting tube 61, thereby positioning the tool head 6.
Furthermore, the outer surface of the positioning pin 60 is provided with a stepped portion facing upward, and when the tool head 6 is pulled up by the clamp cylinder 57, the stepped portion comes into contact with the lower surface of the fitting tube 61, preventing further lifting operation. At the same time, the tool head 6 is fixed to the lifting platform 12.

In FIG. 5, the upper end of a boring bar 7 is detachably connected to the lower end of a rotating shaft 54 in the tool head 6 via a connecting mechanism 151, and the boring bar 7 has the same axis as the tool head 6.
It will be suspended from. Moreover, on one side of the boring bar 7, there is a workpiece W to be bored.
The cutting tool 6 corresponds to the spacing of each bearing hole 11 in
3 is fixedly protruding from the side.

The coupling mechanism 151 is a conventionally known one consisting of an adapter 152 fixed to the lower end of the rotating shaft 54 and a mounting member 153 fixed to the upper end of the boring bar 7.
53 are connected to each other by abutment and slight relative displacement, and by screwing the screw member 154 facing the outer surface of the adapter 152, the adapter 152 and the mounting member 153 are firmly connected. Ru.

The boring bar 7 is composed of a boring bar body 7a having a cutting tool 63 and a rod-shaped connecting portion 7b for fixing to the mounting member 153 of the connecting mechanism 151, which are connected to each other by flanges 155 and 156. Upper part or mounting member 1
53 and the flange 156, a support tube 158 is mounted with a pair of bearings 157 interposed between the outer surface of the connecting portion 7b and the outer surface of the connecting portion 7b. This support tube 158 is supported by the support jig 8, and an annular path 159 open downward is defined between the support tube 158 and the flanges 155, 156 of the boring bar 7.

Referring also to FIG. 6, at the upper end of the support tube 158 there is a press plate 1 for holding down the outer ring of the bearing 157.
60 is fixed to this presser plate 160,
A connecting arm 161 extending upward and bent outward is integrally provided. In addition, passages 162 and 163 for supplying fluid, such as air, to the annular passage 159 are formed in series in the connecting arm portion 161 and the support tube 158, and a fluid supply means 164 is connected to the passage 162. Ru.

The fluid supply means 164 includes a valve body 165 suspended from the tool head 6, and a valve rod 166 that is fitted and fixed to the connecting arm 161 and inserted into the valve body 165.

The valve body 165 is suspended from the tool head 6 via a pair of elastic rods 167 fixed to the lower part of the tool head 6, and an insertion hole 168 extending vertically is bored in the valve body 165. Furthermore, an ejection fluid supply conduit 169 is connected to the upper end of the valve body 165. Further, on the inner surface of the insertion hole 168, a plurality of, for example, three annular grooves 170, 171, 172 are provided at equal intervals in the axial direction, and on the outer surface of the valve body 165, each annular groove 170, 171 , 172, detection fluid supply pipes 173, 174, 17 individually communicated with
5 is connected.

In FIG. 7, each of the fluid supply pipes 169,
173-175 are connected to a head-side fluid manifold 176 fixed to the top surface of the tool head 6. This head-side fluid manifold 176 has four connection holes 177, 178, 179, 1 which communicate with each fluid supply pipe line 169, 173-175 individually.
80, and the elevating platform 12 has connection holes 17 for them.
Connection holes 181, 1 that can communicate individually with 7 to 180
A platform side fluid manifold 185 having 82, 183, 184 is fixed. Both fluid manifolds 176, 185 are connected to each other when the tool head 6 is pulled upward and fixed to the lifting table 12, and at that time, the connecting holes 177, 181;
178, 182; 179, 183; 180, 18
4 communicate with each other.

In addition, fluid supply pipes 186, 1
87, 188, 189 are connected individually,
These fluid supply lines 186-189 are commonly connected to a fluid supply source 190. Moreover, in the middle of the three fluid supply pipes 187 to 189 that can communicate with the respective annular grooves 170 to 172 of the valve body 165, there are solenoid valves S1, S2, S3 and a pressure switch 191 that operate for each type of boring bar 7.
192 and 193 are provided, respectively. These pressure switches 191 to 193 are connected to the fluid supply line 18.
Activates when the pressure within 7 to 189 exceeds a certain value.

In FIG. 8, the valve rod 166 has a communication passage 194 extending over its entire length and connects the connecting arm 161.
It is fitted and fixed. As a result, the communication path 194
is connected to the passage 162, and the valve rod 16 is connected to the passage 162.
6 is installed vertically. An enlarged portion 195 is provided at the upper end of the valve rod 166, and the enlarged portion 195 has an outer diameter large enough to fit into the insertion hole 168 of the valve body 165. Moreover, enlarged part 19
5 is selected to be slightly larger than the width of each of the annular grooves 170 to 172 in the valve body 165, and the outer surface of the enlarged portion 195 has insertion holes 168 on both sides of the annular grooves 170 to 172. Annular sealing members 196 and 197 are fitted in sliding contact with the inner surface.

The length of the valve rod 166 is determined according to the outer diameter of the corresponding boring bar 7, and therefore each annular groove 170-172 has both ends enlarged according to the corresponding boring bar 7. 195 is selectively blocked.

In FIGS. 9 and 10, at the bottom of the column 3, four supporting jigs 8 for slidably and rotatably supporting different types of boring bars 7 are arranged at intervals of 90 degrees around the column 3. They are placed with a gap between them. These support jigs 8 are supported by a cylindrical jig carrier 64 that surrounds the support column 3, and by displacing the jig carrier 64 around the vertical axis, a desired support jig 8 can be moved to the processing station. It can be brought to S.

An upper guide rail 65 with a U-shaped cross section that opens downward is fixed to the outer surface of the lower part of the column 3 along an imaginary circumference centered on the center position of the column 3. A lower guide rail 66 is fixed below, spaced apart from the rail 65, and has a U-shaped cross section that opens upward and extends along a virtual circumference corresponding to the upper guide rail 65.

The jig carrier 64 is connected to upper and lower guide rails 65, 6.
At the top of the jig carrier 64, a plurality of rollers 67 rolling on an upper guide rail 65 are supported at intervals, and at the bottom of the jig carrier 64, a lower A plurality of rollers 68 rolling within the guide rail 66 are supported with a space between them, and a plurality of rollers 141 rolling on the outer upper edge of the lower guide rail 66 are supported with a space between them. It is supported pivotably. Therefore, the jig carrier 64
is guided by upper and lower guide rails 65 and 66 and is rotatable around a vertical axis.

In order to rotate the jig carrier 64, an indexing mechanism 69 is provided at the bottom of the column 3.
The index mechanism 69 includes an index motor 70, a gear box 71 containing a gear train (not shown) for decelerating and transmitting the driving force of the index motor 70, a driving gear 72, and a gear box 71.
and a gear train 73 for transmitting the driving force from the drive gear 72 to the drive gear 72. The gear box 71 is fixed to the lower part of the support column 3, and the index motor 70 is fixed to the lower part of the gear box 71.

On the other hand, an internal gear 74 is provided at the bottom of the jig carrier 64.
is fixedly installed, and the drive gear 72 is the upper gear 7.
It meshes with 4. Therefore, when the index motor 70 is operated, the internal gear 7 is driven by the drive gear 72.
4, that is, the jig carrier 64 is rotationally driven.

The support jig 8 is basically a rectangular jig body 75.
At least two bearing portions 76 and 77 are integrally provided. The jig main body 75 is vertically longer than the workpiece W to be bored, and one bearing part 76 protrudes from the jig main body 75 so as to be located above the workpiece W, and the other bearing part 77
The jig body 75 is positioned below the workpiece W.
It is installed protruding from. Support holes 78 and 79 having vertical axes are provided concentrically in both bearing parts 76 and 77. Moreover, the upper support hole 78 is connected to the boring bar 7.
The inner diameter is determined so that the support tube 158 disposed on the upper part of the tube can be slidably inserted therein. Further, a bearing 81 for slidably and rotatably supporting the lower part of the boring bar 7 is mounted in the lower support hole 79. Further, a guide protrusion 82 is integrally provided which protrudes in the same direction as both the bearing parts 76 and 77, and the guide protrusion 82 has the support holes 78 and 7.
A guide hole 83 concentric with 9 is bored. This guide hole 83 is formed in a key shape so that the cutting tool 63 of the boring bar 7 can be inserted therethrough.

Such a support jig 8 is supported by the jig carrier 64 so as to be able to approach the jig carrier 64 and move away from the jig carrier 64 within a regulated range.

That is, on the jig main body 75 of the support jig 8, a pair of upper support protrusions 84 and a pair of lower support protrusions 85 are provided protrudingly provided on the side opposite to the respective bearing parts 76, 77. Stoppers 86 and 87 bent downward are provided at the tips of these upper and lower support protrusions 84 and 85, respectively. On the other hand, on the jig carrier 64, a pair of upper holding cylinders 88 corresponding to the both upper support protrusions 84 are provided at positions spaced apart by 90 degrees in the circumferential direction.
and a pair of lower holding cylinders 89 corresponding to both lower support protrusions 85 are provided. Each holding cylinder 88, 89 has an axis parallel to one diameter line of the jig carrier 64, and is fixed through the jig carrier 64, and the upper part of the protruding end of each holding cylinder 88, 89 has an axis parallel to one diameter line of the jig carrier 64. , upwardly protruding protrusions 90 and 91 for placing the lower surfaces of the lower support protrusions 84 and 85, respectively, are provided in a protruding manner. Furthermore, both holding cylinders 8
Press pins 92 and 93 protrude from the protruding ends of 8 and 89, respectively.
are biased in the projecting direction by springs 94 and 95 housed within each holding cylinder 88 and 89.

According to this structure, the upper and lower support protrusions 84 and 85 of the support jig 8 are connected to the protrusion 9 on the jig carrier 64 side.
0 and 91, the support jig 8 is pressed by the pressing pins 92 and 93, and each stopper 8
6 and 87 are supported by the jig carrier 64 in a state where they are in contact with the protrusions 90 and 91. When the support jig 8 is brought to the position of the processing station S in this state,
Both support holes 78 and 79 of support jig 8 and guide hole 8
The axis of No. 3 is located outward from the axis of the boring bar 7 above it, and when boring, it is necessary to move the support jig 8 close to the jig carrier 64 and fix it. be.

Therefore, at a position corresponding to the processing station S, a jig clamping cylinder 96 corresponding to the upper part of the jig main body 75 and a jig main body 75 are provided on the side of the column 3.
Cylinder 97 for jig clamp corresponding to the lower part of 5
and will be provided. The rods 98, 99 of these jig clamping cylinders 96, 97 extend outward along one diameter line of the jig carrier 64, and the tips of the rods 98, 99 are connected to the slump members 100, 1.
01. Also, each clamp member 1
00 and 101 are supported by the support column 3 with the midway as a fulcrum, and jig clamp cylinders 96 and 9
It rotates around the horizontal axis in response to the expansion and contraction operation of 7.

On the other hand, the jig main body 75 of the support jig 8 is provided with an L so that the other end of the upper clamp member 100 can be engaged with the jig main body 75 of the support jig 8.
A locking protrusion 102 bent in a letter-shaped manner is provided in a protruding manner, and a locking protrusion 103 bent in an L-shape is integrally provided to engage the other end of the lower clamp member 101 .

Furthermore, four dowel pins 105 having a regulating step 104 facing outward are protruded from the side of the support 3 facing the processing station S.
5 is provided with four positioning holes 106 corresponding to the knock pins 105.

At the part corresponding to processing station S, post 3
A bellows-shaped cover 107 is provided between the lower part of the drive mechanism 4 and the lower part of the lifting platform 12 of the drive mechanism 4 so as to cover the threaded rod 15. Therefore, the threaded rod 15 is always covered regardless of whether the drive mechanism 4 moves up or down.

The transport mechanism 10 includes a pallet guide rail 110 horizontally arranged on the opposite side of the support column 3 with respect to the processing station S, and a pallet 111 guided by the guide rail 110 while supporting and fixing the workpiece W. Become. Pallet guide rail 1
10 includes an upper guide portion 114 having a plurality of guide rolls 113 arranged between a pair of guide plates 112 facing each other, and a pair of guide plates 115 facing each other.
It is constructed by connecting a lower guide part 117 with a plurality of guide rollers 116 arranged therebetween by a connecting member 118, and is arranged horizontally except for the part corresponding to the processing station S.

The pallet 111 has a flat plate shape, and is guided by upper and lower guide portions 114 and 117 of the pallet guide rail 110 to be carried into a position corresponding to the processing station S, and is also carried out from the processing station S. This pallet 111 includes a plurality of positioning pins 119 that are fitted into the workpiece W, upper and lower clamp members 120 and 121 for engaging and fixing the workpiece W, and an abutment pin 122 that abuts the workpiece W. and is provided. The positioning pin 119 is fitted to the workpiece W, and the abutment pin 122 is fitted to the workpiece W.
By bringing the clamp members 120, 121 into contact with the workpiece W, the workpiece W is moved into the bearing hole 1.
1 is fixed to the pallet 111 with the end vertically.

The workpiece support mechanism 9 is disposed at a portion corresponding to the processing station S on the opposite side to the support column 3. This work support mechanism 9 includes a moving table 125 that is movable in a horizontal direction perpendicular to the transport mechanism 10, and a moving table 125 that is movable in a horizontal direction perpendicular to the transport mechanism 10.
a pressing cylinder 126 for horizontally driving the 5;
A stop position switching cylinder 127 that comes into contact with the moving table 125 and restricts the horizontal movement of the moving table 125 in two stages.
and a reversing motor 128 fixed to the moving table 125.
and a pallet holding frame 130 fixed to the tip of the output shaft 129 of the reversing motor 128.

The moving table 125 is movable along a pair of guide rods 131 fixed on the base 2 along the horizontal direction perpendicular to the transport mechanism 10.
5 is connected to a rod 132 of a pressing cylinder 126. The pressing cylinder 126 is fixed to the end of the base 2 on the opposite side of the support column 3 with respect to the processing station S, and by expanding and contracting the pressing cylinder 126, the direction in which the movable table 125 approaches the processing station S and the direction of the processing station Move in the direction away from S.

The stop position switching cylinder 127 is disposed on the base 2 at a portion close to the processing station S, facing the moving table 125, and its rod 133 can come into contact with the side surface of the moving table 125 on the processing station S side. . The moving table 125, which is in contact with the rod 133 while the stop position switching cylinder 127 is extended, moves the axis of the bearing hole 11 in the workpiece W supported by the moving table 125 to the boring bar 7 at the processing station S. When the stop switching cylinder 127 is driven for reduction, the moving table 125 aligns the axis of the bearing hole 11 in the workpiece W with the axis of the boring bar 7. It is possible to advance to the position.

The output shaft 129 of the reversing motor 128 is connected to the moving table 12
5 and protrudes toward the processing station S side, and a pallet holding frame 130 at the tip of this output shaft 129 is fixed. Pallet holding frame 1
30 is basically formed into a flat plate shape, and upper and lower guide portions 11 of the transport mechanism 10 are provided at both upper and lower ends of the 30.
Guide grooves 134 and 135 corresponding to 4 and 117 are provided, respectively. Furthermore, the pallet holding frame 13
At 0, the pallet 111 comes into contact with the pallet 111.
A pair of clamp cylinders 13 for fixing the
6 is arranged, and by extending the clamping cylinder 136 with the pallet 111 fitted into the guide grooves 134 and 135, the pallet 11
1 is supported and fixed to the pallet holding frame 130.

In this workpiece support mechanism 9, the workpiece W conveyed by the conveyance mechanism 10 can be moved to the processing station S in two stages and supported. That is, by extending the pressing cylinder 126 while the stop position switching cylinder 127 is extended, the workpiece W is moved in the direction opposite to the column 3, and the axis of the bearing hole 11 is slightly shifted from that of the boring bar 7. The workpiece W can be moved to a position where the axis of the bearing hole 11 is aligned with the boring bar 7 by extending the pressing cylinder 126 with the stop position switching cylinder 127 contracted.

That is, the jig main body 75 of the support jig 8 has bearing portions 76 and 77 that align the axis of the bearing hole 11 in the work W when the jig body 75 comes into contact with the side surface of the workpiece W supported on the moving table 125 on the support column 3 side. A positioning pin 143 is provided in a protruding manner to match the axis of the boring bar 7 supported by the shaft. Moreover, a small diameter protrusion 143 is provided at the tip of the positioning pin 143.
a is provided protrudingly, and the protrusion 143a is attached to the workpiece W.
It can be fitted into a pre-prepared hole. In addition, in order to guide the movement of the work W when moving the axis of the bearing hole 11 to a position where it coincides with the boring bar 7, the pallet 111 has a fitting hole 137 at the tip.
A pair of guide posts 138 are provided to protrude toward the support column 3 side. On the other hand, a positioning pin 140 having a fitting protrusion 139 at its tip that can be fitted into the fitting hole 137 is provided in a protruding manner on the jig main body 75 .

Next, the operation of this embodiment will be explained. The workpiece W is transported to a position corresponding to the processing station S by the transport mechanism 10. As a result, the pallet 111 supporting the workpiece W fits into both guide grooves 134 and 135 of the pallet holding frame 130. By extending the clamping cylinder 136 in this state, the pallet 111 is fixed to the pallet holding frame 130. Next, when the press cylinder 126 is extended while the stop position switching cylinder 127 is kept in the extended state, the moving table 125 moves until it comes into contact with the rod 133 of the stop position switching cylinder 127, so that the workpiece W is moved into its bearing hole 11. The axis moves to a position slightly shifted from directly below the boring bar 7 to the side opposite to the support column 3.

With the work W being moved in this manner, the feed motor 16 of the feed mechanism 5 is operated to rotate the holder 15 and lower the drive mechanism 4, tool head 6, and boring bar 7. At this time, the axis of the bearing hole 11 of the workpiece W is slightly deviated from the boring bar 7 by a few mm.
Since the boring bar 7 is stationary at a fixed position with each bite 63 facing accurately in the direction opposite to the column 3, the boring bar 7 can be moved without each bite 63 interfering with the bearing hole 11 as shown in FIG. 7 can be inserted into the bearing hole 11. With the boring bar 7 lowered, the support cylinder 158 provided on the boring bar 7 is fitted into the support hole 78 of the support jig 8, the lower end of the boring bar 7 is fitted into the bearing 81, and the boring bar 7 is further fitted into the support hole 78 of the support jig 8. Guide hole 8 is in the middle of
3 is inserted.

After the boring bar 7 is lowered and is slidably and rotatably supported by the support jig 8, the stop position switching cylinder 127 is contracted and the pressing cylinder 126 is extended again. As a result, moving platform 1
25 moves forward several mm toward the support column 3 until the workpiece W supported on the pallet 111 comes into contact with the positioning pin 143 of the jig main body 75 in the support jig 8, and the workpiece W is aligned with the axis of the bearing hole 11. is the 12th
As shown in the figure, it is positioned at a position that coincides with the axis of the boring bar 7.

When the workpiece W is positioned with the axis of its bearing hole 11 aligned with the boring bar 7, each bite 63 of the boring bar 7 is located above each bearing hole 11, and the boring bar 7 is connected to the drive mechanism 4. By lowering it by the feed mechanism 5 while rotating, the bearing hole 11 is bored by each cutting tool 63.

At the start of this boring process, the boring bar 7
Whether or not the pressure is appropriate for the diameter of the bearing hole 11 is confirmed by operating the pressure switches 191 to 193. That is, in the case shown in FIG. 8, when the solenoid valve S1 is opened, the valve rod 1
Since both sides of the annular groove 170 are shut off at 66, only the pressure switch 191 is activated, and in response to the signal from the pressure switch 191, an indicator light (not shown) is turned on, etc., so that the type of the boring bar 7 can be accurately confirmed. can do.

In addition, during the boring process, the fluid from the fluid supply source 190, such as air, flows through the fluid supply pipe 186, the connection holes 181, 177, the ejection fluid supply pipe 169, the communication passage 194, and the passage 16.
Since the cutting fluid is supplied to the annular passage 159 through the annular passage 159 and ejected downward from the annular passage 159, the cutting fluid is reliably prevented from entering the bearing 157.

When the boring process is completed, the stop position switching cylinder 127 is extended again. As a result, the movable table 125 moves back by several mm in the direction away from the support column 3, and the axis of the bearing hole 11 becomes eccentric from the axis of the boring bar 7. In this state, the boring bar 7 is raised, but at this time, each bite 63 is
1, so no scratches such as cutter marks are left in the bearing hole 11. Thereafter, the press cylinder 126 is contracted to move the pallet holding frame 111 back to the position of the transport mechanism 10, and the clamping cylinder 136 is further reduced to release the pallet 111 from being clamped to the pallet holding frame 130. , the pallet 111 is carried out from the processing station S by the conveyance mechanism 10.

In this way, the boring of the workpiece W is completed, but when the type of the workpiece W changes, the corresponding boring bar 7 and support jig 8 are moved to the position corresponding to the processing station S according to the change in type. It can be placed at any time.

That is, by operating the index motor 43 of the index mechanism 42, the tool head 6 supporting the desired boring bar 7 is moved to a position corresponding to the processing station S, and the tool head 6 is transferred to the drive mechanism 4 by the clamp cylinder 57. Can be fixed. Further, by operating the index motor 70 of the index mechanism 69, a desired supporting jig 8 is moved to a position corresponding to the processing station S, and by operating the jig clamping cylinders 96, 97, the supporting jig 8 is moved to a position corresponding to the processing station S. can be fixedly arranged on the processing station S. Therefore, the boring bar 7 and the support jig 8 can be changed according to changes in the type of workpiece W, and it is possible to cope with high-mix low-volume production.

By the way, the boring bar 7 is attached to the tool head 6.
When connecting the valve rod 166 on the boring bar 7 side to the valve body 16 on the tool head 6 side.
5, but the valve rod 16 is inserted in the connected state.
6 axis and the insertion hole 16 in the valve body 165
8 may be misaligned. However, since the valve body 165 is suspended from the tool head 6 via a pair of elastic rods 167, by bending the elastic rods 167, the valve rod 166 can be fixed to the valve body 165 even if there is some deviation.
It can be inserted inside.

In the workpiece support mechanism 9, the reversing motor 128
is provided to invert the workpiece W when slicing the end face of the workpiece W in addition to boring, and is not necessary when only boring is performed.

C. Effects of the Invention As described above, according to the present invention, the dead weight of the boring bar acts in the axial direction, and deflection of the boring bar can be avoided and vibrations and rope-jumping phenomena caused by the deflection can be avoided. Occurrence is prevented. Therefore, it is possible to make the support interval of the support jig relatively large and to simplify the support structure.
Restrictions on the workpiece due to the support jig are reduced, and the rotational speed of the boring bar can be increased to improve machining efficiency.

In addition, a plurality of boring bars and a plurality of support jigs are arranged around the support column, and these boring bars and support jigs are selectively brought to positions corresponding to the processing station, so that it is possible to The boring bar and support jig can be quickly and easily replaced in response to changes in the number of parts, contributing to an improvement in work efficiency.

Furthermore, by inserting the valve rod, which is individually provided on the boring bar side, into the insertion hole of the valve body suspended on the tool head, the annular grooves of the valve body can be adjusted depending on the type of boring bar. Selectively blocked. Therefore, when the tool head is connected to the lifting platform of the drive mechanism, fluid is supplied from the fluid supply source to each annular groove according to the connection of the head side fluid manifold and the lifting platform side fluid manifold, and depending on the type of boring bar. Since the annular groove is selectively closed by the valve rod, the pressure switch can be selectively actuated to immediately check whether the boring bar is correct.

Moreover, the annular path between the support cylinder and the boring bar, which are attached to the upper part of each boring bar via bearings, communicates with the fluid supply source when the head-side fluid manifold and the lifting platform-side fluid manifold are connected. Since fluid is ejected downward from the annular path, it is possible to reliably prevent foreign matter such as cutting fluid and chips from entering the bearing during boring, and ensure that the selected boring bar is appropriate. The valve body, valve rod, head side fluid manifold, and platform side fluid manifold can be effectively utilized to prevent foreign matter from entering.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall perspective view, FIG. 2 is an overall vertical sectional view, and FIG.
The figure is a - line enlarged sectional view of Figure 2, and Figure 4 is an enlarged cross-sectional view of Figure 2.
Fig. 5 is an enlarged longitudinal sectional view of Fig. 2, Fig. 6 is a view taken in the direction of the arrow in Fig. 5, Fig. 7 is a fluid supply circuit diagram, Fig. 8 is a valve main body and An enlarged vertical cross-sectional view of the valve rod, FIG. 9 is an enlarged cross-sectional view taken along the - line in FIG. 2, and FIG.
Figure 11 is an enlarged vertical cross-sectional view of the main part showing the boring bar inserted into the bearing hole of the workpiece, and Figure 12 is the main part when the axis of the bearing hole of the workpiece is aligned with the boring bar. It is an enlarged longitudinal cross-sectional view. DESCRIPTION OF SYMBOLS 1... Boring processing device, 2... Base, 3... Support column, 4... Drive mechanism, 6... Tool head, 7...
... Boring bar, 8 ... Support jig, 11 ... Bearing hole as hole, 12 ... Lifting platform, 13 ... Rotation drive motor, 42 ... Index mechanism, 54 ...
... Rotating shaft, 157 ... Bearing, 158 ... Support cylinder,
159...Annular path, 165...Valve body, 16
6... Valve rod, 168... Insertion hole, 169
...Ejection fluid supply pipe line, 170-172...Annular groove, 173-175...Detection fluid supply pipe line,
176...Head side fluid manifold, 177~
~184... Connection hole, 185... Lifting platform side fluid manifold, 190... Fluid supply source, 191-1
93...Pressure switch, 194...Communication path, S...
...Processing station, W...Work.

Claims (1)

[Claims] 1. In a boring device for a workpiece W having a hole 11 to be bored over a relatively long distance in the axial direction, a support 3 is erected on a fixed base 2.
A rotary drive motor 1 is mounted on a lifting platform 12 that can be raised and lowered along the pillar 3 at a position corresponding to the processing station S set on the base 2 on the side of the pillar 3.
A plurality of vertical drive mechanisms 4 are arranged around the upper part of the column 3, can be selectively fixed to the lower part of the lifting platform 12, and can be connected to the rotary drive motor 13. a tool head 6 with a rotating shaft 54;
an indexing mechanism 42 for selectively bringing the tool to a position corresponding to the lifting platform 12; a plurality of boring bars 7 each having an upper end removably connected to the rotating shaft 54 of the tool head 6; rotating the boring bar 7; In order to support it freely and slidably,
A plurality of support jigs 8 are arranged around the lower part of the support column 3 to enable selective movement to a position corresponding to the processing station S; a support cylinder 158 defined between and attached to the upper part of each boring bar 7 via a bearing 157 to be supported by the support jig 8; a valve body 165 having an insertion hole 168 in which a plurality of annular grooves 170 to 172 are provided at intervals in the axial direction; A valve rod 166 is provided in each boring bar 7 and has a communicating path 194, and is insertable into the insertion hole 168 in order to selectively cut off the annular grooves 170 to 172 depending on the type thereof.
and; detection fluid supply pipes 173 to 175 that communicate with each of the annular grooves 170 to 172 individually and are connected to the valve body 165; and the valve rod 166.
When inserted into the valve body 165, the communication passage 19
4; an ejection fluid supply pipe 169 connected to the valve body 165 to communicate with the valve body 165; Fixed head side fluid manifold 176
and; provided in the lifting platform 12 to be connected to the head side fluid manifold 176 when the tool head 6 is connected to the lifting platform 12, and each of the connection holes 177
A lifting platform side fluid manifold 185 having connection holes 181 to 184 individually communicating with ~180; each connection hole 18 of the lifting platform side fluid manifold 185 corresponding to the detection fluid supply conduit 173 to 175
2 to 184 and pressure switches 191 to 193 respectively interposed between the pressure switches 2 to 184 and the fluid supply source 190.