JPH052442B2 - - 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. Borings such as engine cylinder blocks that have multiple concentric bearing holes spaced apart from each other, and engine cylinder heads that have multiple bearing holes concentrically spaced apart for supporting camshafts. Regarding processing 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-mentioned 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 have an adverse effect on machining accuracy. Therefore, the rotational speed of the boring bar had to be kept relatively low, resulting in poor machining efficiency.

The present invention has been made to solve this problem, and improves machining accuracy by preventing the boring bar from being bent by driving the boring bar to rotate around the vertical axis for boring. In addition, it is an object of the present invention to provide a boring machine in which the bearing structure of the boring bar is simplified and the machining efficiency is further improved.

B. Structure of the Invention (1) Means for Solving the Problems According to the present invention, in order to achieve the above object, a workpiece having a hole to be bored over a relatively long distance in the axial direction. The boring device includes a support that is erected on a base, a tool head that is movable up and down along the support and has a vertical rotating shaft, and an upper end of the tool head that is connected to the rotating shaft via a universal joint. A boring bar that hangs down from a tool head and has a cutting tool protruding from its outer periphery; a support jig that is disposed at the bottom of the support column to support the boring bar so that it can slide in the axial direction and rotate freely; A workpiece support mechanism is provided on the base opposite to the jig and capable of supporting the workpiece so that the hole to be machined is vertical, and the support jig is capable of inserting and removing the upper and lower parts of the boring bar from above. Upper and lower bearing parts having upper and lower support holes, respectively, which can be fitted and supported are provided in a protruding manner, and the workpiece support mechanism includes a workpiece holder that holds a workpiece, and a workpiece holder that is attached to the support jig. A first position that is positioned by engagement of the provided positioning pin with the workpiece and aligns the machined hole of the workpiece with the axis of each of the support holes, and that allows insertion of the boring bar into the machined hole. a slide guide mechanism that slides and guides the workpiece holder substantially horizontally between a second position eccentric from the axis of each support hole; and a slide guide mechanism that selectively moves the workpiece holder between the two positions. It has a drive device.

(2) Effect The boring bar is held in the tool head in a vertical state by its own weight. Then, move the workpiece holder of the workpiece support mechanism to the second position (at this time,
When the boring bar is lowered while the workpiece is held at an eccentric position with respect to the boring bar axis, the boring bar avoids interference between the cutting tool protruding from the outer periphery and the hole to be machined in the workpiece. However, it is inserted into the hole to be machined and supported by a pair of upper and lower bearings of the support jig. Next, when the workpiece holder is forcibly slid to the first position,
The vertical boring bar and the hole to be machined in the workpiece are in a concentric relationship. By driving the boring bar axially and rotationally in this state, the hole to be machined can be bored. During such boring processing, the weight of the boring bar acts in the axial direction, thereby avoiding deflection of the boring bar, thereby preventing the occurrence of vibrations and skipping phenomena caused by the deflection.

In particular, by simply reciprocating the workpiece holder guided by the slide guide mechanism approximately horizontally using the driving force of the drive device, the first
Since the selective movement between the second position and the second position is easily and accurately performed, the workpiece can be directly positioned on the support jig with high precision by directly engaging the positioning pin on the support jig side with the workpiece, especially in the first position. In addition to this, the hole to be machined in the workpiece and the boring bar can be aligned extremely easily and accurately.

Furthermore, the boring bar has its upper end connected to the rotating shaft of the tool head via a universal joint and is in a hanging state and can swing in any direction.
Even if the rotating shaft and the axis of each support hole are not in a straight line, power transmission between the rotating shaft and the boring bar is achieved accurately.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. , 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, and a feed mechanism 5 for driving the drive mechanism 4 up and down; A plurality of tool heads 6, for example, four, which are selectively and removably fixed to the lower part of the drive mechanism 4, and a boring bar 7 which is swingable and whose upper end is removably connected to each tool head 6 and which extends downward. , a plurality of, for example, four, supporting jigs 8 that are selectively fixed to the lower part of the support column 3 at a position corresponding to the boring bar 7, that is, a position corresponding to the processing station S, and a workpiece carried into the processing station S. W A workpiece support mechanism 9 for supporting and positioning a cylinder head having five camshaft bearing holes 11 concentrically spaced apart from each other as holes to be machined, and a workpiece supporting mechanism 9 for carrying the workpiece W to a processing station S. and a transport mechanism 10 that controls unloading from 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 platform 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 table 12 is prevented from angularly displacing the threaded rod 15 around the axis thereof, and the lifting platform 12 is prevented from angularly displacing the threaded rod 15 by the operation of the feed motor 16.
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 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 position.

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. I can do it.

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 fixedly installed on the upper part of 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, as well as between the upper and lower guide grooves 27 and 28, and 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 driving force of the index motor 43, and an output shaft 45 of the gear box 44. The drive gear 46 is fixed to the drive gear 46 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 is the gear box 4
The output shaft 4 protrudes downward from the output shaft 4.
A drive gear 46 is fixed to the lower end of 4.

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 be movable relative to each other in an upward direction. 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 support arm 47, the amount of upward protrusion from the tool head 6 does not reach the lower end of the output shaft 14 in the drive mechanism 4. 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.

On the other hand, a boring bar 7 is connected to the lower end of the rotating shaft 54 in the tool head 6 via a universal joint 62.
The upper ends of the two are removably connected. Therefore, the boring bar 7 is suspended from the tool head 6 so as to be swingable in any direction through 360 degrees. A cutting tool 63 is fixedly provided on one side of the boring bar 7 so as to protrude laterally in correspondence with the spacing between the respective bearing holes 11 in the workpiece W to be bored.

5 and 6, at the bottom of the support column 3, four support jigs 8 for slidably and rotatably supporting different types of boring bars 7 are arranged at 90 degrees around the support column 3. are placed at intervals of . These support jigs 8 are supported by a cylindrical jig carrier 64 that surrounds the support column 3, and by angularly 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 has 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 roller is supported. 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 pivoted. 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 drive mechanism 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 a bearing 80 fixedly disposed on the upper part of the housing can be slidably fitted 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. Furthermore, a guide protrusion 82 is integrally provided on the shaft body 75 between the two bearing parts 76 and 77 and protrudes in the same direction as both the bearing parts 76 and 77. A guide hole 83 concentric with the holes 78 and 79 is drilled. This guide hole 83 is
It is formed into a keyhole 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, and these press pins 92 and 9
3 is 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, 91, the support jig 8 is pressed by the pressing pins 92, 92, 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, 79 and guide hole 83 of the support jig
The axis of the supporting jig 8 is located outward from the axis of the boring bar 7 located above it, and when boring, it is necessary to move the support jig 8 close to the jig carrier 64 side and fix it. .

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. Rods 98 and 99 of these jig clamping cylinders 96 and 97 extend outward along one diameter line of the jig carrier 64.
The ends of the rods 98, 99 are clamp members 100,
101. Further, each clamp member 100, 101 is supported by the support column 3 with its middle as a fulcrum, and the jig clamp cylinder 96,
It rotates around the horizontal axis in response to the expansion and contraction operation of 97.

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
Reference numeral 10 indicates an upper guide portion 114 having a plurality of guide rollers 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 part 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 115 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 has a sliding hole 125a through which the guide rods 131 are passed, so that the moving table 125 can horizontally slide along a pair of guide rods 131 fixed on the base 2 along the horizontal direction perpendicular to the transport mechanism 10. have. This moving table 125 includes a pressing cylinder 126
The rods 132 are connected. 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 operating the cylinder 126 to expand and contract,
The moving table 125 slides in a direction approaching the processing station S and in a direction away from the processing station 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 end surface of the moving table 125 on the processing station S side. . The movable table 125, which abuts the rod 133 of the stop position switching cylinder 127 while being extended and held, moves the workpiece W supported on the movable table 125 via the pallet holding frame 130 and the pallet 111. A position where the axis of the bearing hole 11 is slightly eccentric outward from the axis of each support hole 78, 79 (therefore, the axis of the boring bar 7) at the processing station S (this position is referred to as the second position of the present invention) ). On the other hand, when the stop switching cylinder 127 is driven to reduce from this state, the moving table 125 moves to the bearing hole 11 in the workpiece W.
It becomes possible to move forward to a position where the axis of the drilling bar 7 coincides with the axis of each of the support holes 78 and 79 (therefore, the axis of the boring bar 7).

Therefore, the moving table 125 and the pallet holding frame 13
0 and the pallet 111 cooperate with each other to constitute a work holder H of the present invention for holding a work W, and the guide rod 131 and the sliding hole 125a cooperate with each other to form a work holder H for holding a work W. This constitutes a slide guide mechanism G of the present invention that slides and guides the body H substantially horizontally between the first and second positions. Further, the pressing cylinder 126 and the stop position switching cylinder 127 cooperate with each other to forcibly move the workpiece holder H between the first and second positions. It constitutes D.

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 is fixed to the tip of this output shaft 129. 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 axis of the bearing hole 11 of the workpiece W is slightly shifted from the boring bar 7 in the direction opposite to the column 3. position, and then extend the press cylinder 126 with the stop position switching cylinder 127 contracted to bring the axis of the bearing hole 11 into alignment with the axis of each support hole 78, 79 (this position is set to the original position). The workpiece holder H, and therefore the workpiece W, can be moved to the first position of the present invention.

That is, the jig main body 75 of the support jig 8 has the support column 3 of the workpiece W held on the workpiece holder H.
The axis of the bearing hole 11 in the workpiece W is aligned with the support hole 7 of the bearing portions 76 and 77 when the workpiece W comes into contact with the side surface.
A positioning pin 143 is provided in a protruding manner to align the axes of the holes 8 and 79 (therefore, the axis of the boring bar 7). Moreover, a small-diameter protrusion 143a is protruded from the tip of the positioning pin 143, and the protrusion 143a can be fitted into a hole previously provided in the workpiece W. In addition, in order to guide the movement of the workpiece W when moving the axis of the bearing hole 11 to a position where it coincides with the axis of the support holes 78 and 79 as described above, the pallet 111 has a pair of fitting holes 137 at its tips. A guide post 138 is 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 holder 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 threaded rod 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, each bite 63 is aligned with the bearing hole 1 as shown in FIG.
The boring bar 7 can be inserted into the bearing hole 11 without interfering with the bearing hole 1. bowling bar 7
In the lowered state, the bearing 80 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 a bearing 81,
Further, a part of the boring bar 7 is inserted into a guide hole 83.

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 positioned at a position that coincides with the axis of the boring bar 7, as shown in FIG.

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. The bearing hole 11 is bored by each cutting tool 63 by lowering it by the feed mechanism 5 while rotating. At this time, since the boring bar 7 is suspended so that it can swing in any direction, even if the axis of the bearing hole 11 in the workpiece W at the processing station S is not completely vertical, it absorbs any of the This allows for accurate boring.

Lower the boring bar 7 while rotating,
When the boring process is completed as shown in FIG. 9, the stop position switching cylinder 127 is extended again.
As a result, the movable table 125 moves back by several mm in a 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, as shown in FIG. In this state, the boring bar 7 is raised, but at this time, each of the bits 63 does not come into contact with the hole 11, so no scratches such as cutter marks are left in the 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, making it possible to cope with high-mix, low-volume production.

In the workpiece support mechanism 9, the reversing motor 128
is provided to invert the workpiece W when performing milling or the like on the end face of the workpiece W in addition to boring, and is unnecessary when only boring is performed.

C. Effects of the Invention As described above, according to the present invention, since the boring bar is supported in its vertical state by the pair of upper and lower bearing parts of the support jig, even if the span by the lower bearing part is lengthened. , it is possible to avoid the occurrence of deflection deformation due to its own weight, and to prevent the occurrence of vibrations and rope-jumping phenomena caused by the deflection. The support structure can be simplified as much as possible, there are fewer restrictions on the workpiece related to the installation of the bearing, and even if the rotational speed of the boring bar is increased, boring can be performed without the above-mentioned vibration or skipping phenomenon. As a result, it can greatly contribute to improving machining efficiency and accuracy as a whole.

In addition, by holding the workpiece holder of the workpiece support mechanism in the second position and moving the boring bar up and down with the workpiece hole eccentrically centered with respect to each support hole of the support jig, the boring bar can be protruded from the outer periphery of the boring bar. The boring bar can be inserted into and removed from the hole of the workpiece without any trouble while avoiding interference between the installed cutting tool and the hole of the workpiece. When the holder is moved from the second position to the first position, the axis of the hole to be machined coincides with the axis of the boring bar, making it possible to perform boring. In particular, by simply reciprocating the workpiece holder guided by the slide guide mechanism approximately horizontally using the driving force of the drive device, the first
Since the selective movement between the second position and the second position can be carried out easily and accurately, especially in the first position, by directly engaging the positioning pin on the support jig side with the workpiece, the workpiece can be moved accurately to the support jig. Coupled with the ability to directly position the workpiece, the hole to be machined on the workpiece and the boring bar can be aligned extremely easily and with high precision, and machining efficiency and precision can be further improved.

Furthermore, the boring bar has its upper end connected to the rotating shaft of the tool head via a universal joint and is in a hanging state and can swing in any direction.
Even if the axis of the rotating shaft and the axis of each support hole are not on a straight line, power can be transmitted from the rotating shaft to the boring bar side without any problem.

[Brief explanation of the drawing]

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.
Figure 5 is an enlarged cross-sectional view taken along the line - of Figure 2.
6 is an enlarged sectional view taken along the - line in FIG. 2, FIG. 7 is an enlarged longitudinal sectional view of the main part showing the state in which the boring bar is inserted into the bearing hole of the workpiece, and FIG.
The figure is an enlarged longitudinal section of the main part when the axis of the bearing hole of the workpiece is aligned with the boring bar, and Figure 9 is an enlarged longitudinal cross-section of the main part corresponding to Fig. 8 when the boring bar is lowered to the lowest limit. 10 is an enlarged cross-sectional view of the main part corresponding to FIG. 7 when the bearing hole of the workpiece is made eccentric before raising the boring bar. DESCRIPTION OF SYMBOLS 1... Boring processing device, 2... Base, 3... Support, 6... Tool head, 7... Boring bar, 8... Support jig, 9... Work support mechanism, 1
1... Bearing hole as a hole to be machined, 54... Rotating shaft, 62... Universal joint, 63... Bit, 76,
77...Bearing portion, 78, 79...Support hole, 143
...Positioning pin, D...Drive device, G...Slide guide mechanism, H...Work holder, W...Work.

Claims (1)

[Claims] 1. In a boring machine for a workpiece W having a hole 11 to be bored over a relatively long distance in the axial direction, a support 3 erected on a base 2 is used.
a tool head 6 having a vertical rotating shaft 54 that can be raised and lowered along the support column 3; 6
3 protrudingly provided, a support jig 8 disposed at the lower part of the support column 3 for supporting the boring bar 7 slidably and rotatably in the axial direction, and this support jig 8. A workpiece support mechanism 9 is provided on the base 2 opposite to the workpiece support mechanism 9 and capable of supporting the workpiece W so that the hole 11 to be machined is vertical. Upper and lower bearing parts 76 and 77 having upper and lower support holes 78 and 79, respectively, which can be fitted and supported in a more removable manner are provided in a protruding manner, and the workpiece support mechanism 9 is connected to a workpiece holder H that holds a workpiece W. Then, the workpiece holder H is positioned by the engagement of the positioning pin 143 provided on the support jig 8 with the workpiece W, and the workpiece hole 11 of the workpiece W is aligned with the axis of each of the support holes 78 and 79. 1st to match
, and the support holes 78, 7 to allow insertion of the boring bar 7 into the hole 11 to be machined.
a slide guide mechanism G that slides and guides the workpiece holder H in a substantially horizontal manner between a second position eccentric from the axis of the workpiece H; and a drive device that forcibly moves the workpiece holder H selectively between the two positions. A boring processing device characterized by having D.