JPS6282307A - Hole diameter measuring instrument - Google Patents

Abstract

PURPOSE:To make a reference adjustment of back pressure without any operator's assistance by mounting a master gauge on a measurement bar so that it is relatively movable in an axial direction which surrounds the measurement gauge, and arranging a jig which inhibits the master gauge to move forth in front of a hole. CONSTITUTION:The instrument consists of the measurement bar 201 which is movable along the axis of the hole 11 to be measured, a measuring head 203 which has an injection nozzle for measuring the hole diameter with the back pressure on the internal surface of the hole 11 on the outer peripheral surface and is fixed atop of the bar 201 and inserted into the hole 11, the master gauge 223 which surrounds it and has a reference hole for setting a referencevalue of the back pressure. Then, the gauge 233 is mounted on the bar 201 so that it moves relatively and axially from the tipl surrounding the head 203 to the rear end position. Further, the jig 8 which allows the bar 201 and head 203 to move forth into the hole 1, but inhibits the gauge 223 from moving forth is arragned fixedly in front of the hole 11. Thus, when the hole diameter is measured, the gauge 223 is placed at the tip position of the bar 201, which is moved forth after the back pressure is adjusted, thereby measuring the hole diameter.

Description

Detailed description of the invention A6 Object of the invention (1) Industrial field of application The present invention is directed to the measurement of back pressure generated between a measuring bar movable along the axis of a hole to be measured and the inner surface of said hole. A measuring head having a plurality of jet nozzles on the outer peripheral surface thereof and being fixed to the tip of the measuring bar and capable of being inserted into the hole in order to measure the diameter of the hole; The present invention relates to a pore diameter measuring device including a master gauge for setting reference values.

(2) Prior Art Conventionally, in such hole diameter measuring devices, the measuring bar and master gauge are separated, and it is common for an operator to attach the master gauge to the measuring head during zero adjustment.

(3) Problems to be Solved by the Invention However, with the above-mentioned conventional device, the work required by the worker for zero adjustment is complicated and requires extra time. Moreover, it is dangerous because it requires the worker to get close to the machine.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a hole diameter measuring device that enables standard adjustment of back pressure without requiring human labor.

B0 Structure of the Invention (11 Means for Solving the Problems) According to the present invention, the master gauge is attached to the measuring bar so as to be relatively movable in the axial direction from the tip position surrounding the measuring head to the rear end position. A jig is fixedly disposed at the front position of the master gauge to allow the measurement bar and the measurement head to move forward into the hole, but to prevent the master gauge from moving forward.

(2) To measure the working hole diameter, bring the master gauge to the tip of the measuring bar, and after adjusting the back pressure, move the measuring bar forward. As a result, the master gauge is prevented from advancing by the jig, and the measuring head is inserted into the hole to measure the hole diameter.

(3) Example Hereinafter, an example in which the present invention is applied to a boring machine will be explained with reference to the drawings. First, in FIGS. 1 and 2, this boring machine 1 is installed on a base 2. An erected pillar 3, 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 pillar 3, and a drive mechanism 4 that drives the drive mechanism 4 up and down. a plurality of tool heads 6, for example, four, which are selectively switched and removably fixed to the lower part of the drive mechanism 4; An extending boring bar 7, a plurality of support jigs 8, for example four, which are selectively switched and fixed to the lower part of the column 3 at a position corresponding to the boring bar 7, that is, a position corresponding to the machining station S, and a machining station S. For example, workpieces W brought in to
A workpiece support mechanism 9 for supporting and positioning a cylinder head having two concentric camshaft bearing holes 11, and a transport mechanism for carrying the workpiece W into and out of the processing station S. 10.

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 lower end of the output shaft 14 is connected to the lifting platform 12.
It rotatably penetrates the lifting platform 12 so as to protrude downward from the lower surface of the board. Moreover, the lower end of the output shaft 14 has a structure that allows spline connection by fitting the rotary shaft 54 of the tool head 6 from below. Also,
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 when the rotation is stopped.

Referring also to FIG. 3, the feed mechanism 5 is the drive mechanism 4.
A threaded rod 15 that is screwed onto the lifting table 12 and extends vertically, and a feed motor 16 for rotationally driving the threaded rod 15.
Equipped with. 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 screw 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, feed motor 1
6 can freely switch its rotation direction between forward and reverse directions.

A pair of guide rails 18 extending vertically are fixed in parallel to the outer surface of the support column 3 on both sides of the threaded rod 15, and the lifting platform 12 is fitted into these guide rails 18. Therefore, the elevating table 12 is prevented from angularly displacing the threaded rod 15 around its axis, and moves up and down along both guide rails 18 in accordance with the rotation of the threaded rod 15 due to the operation of the feed motor 16.

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 a rond that slides into each balance cylinder 19 is fixed to the lifting table 12.

As a result, the lifting platform 12 moves up and down while maintaining a horizontal attitude.

Further, with reference to FIG. 4, each tool head 6 is
Boring bars 7 of different types are connected and supported to accommodate changes in the type of work W, and are arranged around the support 3 at intervals of 90 degrees. These tool heads 6 are each supported by 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 connected to the processing station S, that is, the drive mechanism 4. You can bring it to the position you want.

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

On the other hand, the elevating table 12 in the drive mechanism 4 includes the elevating table 1
When the upper guide member 2 is located at the predetermined uppermost position, the upper guide member 2
3, and a lower guide groove 27 that connects to the lower guide member 24 is provided, and both guide grooves 26.27 have the same radius of curvature as the radius of curvature of the upper and lower guide members 23.24. It is curved.

Each head carrier 22 has the upper and lower guide members 23.2.
It is curved in an arc shape with a radius of curvature corresponding to 4, and is disposed between the upper and lower guide members 23 and 24. Also, between each head carrier 22, a connecting piece 28 curved in an arc shape 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, respectively, and connecting bottles 30 are implanted at the tips of these connecting arms 29, respectively. On the other hand, on the outer surface of the connecting piece 28, a connecting collar 31 is protruded over the entire circumference at a position above the connecting arm 29. 30 from below, each head carrier 22 and each connection piece 28 are connected to each other.

Sector gears 33 and 34 are fixed to the top of each head carrier 22 and the top of each connection piece 28, respectively.
These sector gears 33, 34'' are the internal gear 35 as a whole.
Configure.

Further, a plurality of rollers 36 and 37 that can be moved within the upper guide member 23 and the upper guide groove 26 are pivotally supported on the upper part of the head carrier 22 and the upper part of the connecting piece 28, respectively. Further, at the lower part of the head carrier 22 and the lower part of the connecting piece 28, there are a plurality of rollers 38, 39 that can be moved within the lower guide member 24 and the lower guide groove 27, and the outer upper edge of the lower guide member 24 and the lower guide groove 27. A plurality of rollers 40 and 41 that can be moved on the outer upper edge of the roller are respectively supported. As a result, each head carrier 22 and each connecting piece 28 are connected to each other, and between the upper and lower guide members 23 and 24, as well as between the upper and lower guide members 23 and 24.
It can be moved guided between the lower guide grooves 26, 27, ie rotated around the column 3.

An indexing mechanism 42 is provided to rotate each head carrier 22 and connecting piece 28 in this manner and bring any desired head carrier 22, ie, tool head 6, to the position of the drive mechanism 4. This index mechanism 42 is
an index moke 43; a gear box 44 containing a gear train (not shown) for decelerating and transmitting the driving force of the index moke 43; It consists of a drive gear 46 that meshes with the drive gear 46. The gear box 44 is fixed to the upper part of the support column 3, and the 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 be able to move relative upwardly.

That is, the head carrier 22 has each of the connecting arms 29
Support arms 47 are integrally protruded below the respective connecting arms 29 and each support arm 47, and support bins 48.
49 will be erected.

On the other hand, the tool head 6 is provided with upper and lower arms 50.51 that can be placed on the connecting arms 29 and the support arms 47.
Through-holes 52 and 53 are respectively drilled through which the holes 8 and 49 can be inserted. Moreover, the thickness of each arm 50°51 is 48.4 mm thick.
The length of the support bin 48.9 is smaller than the length of the support bin 48.
49 inserted into the through holes 52.53, each arm 50.
The tool head 6 can be moved upwardly relative to the head carrier 22 so 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 rotatably supported on the tool head 6, and this rotary shaft 54 is rotatably supported around the axis.
Both upper and lower ends of the tool protrude from the tool head 6. In addition, the length of the upward protrusion of the rotating shaft 54 from the tool head 6 does not reach the lower end of the output shaft 14 in the drive mechanism 4 when the arms 50 and 51 are placed on the connecting arm 29 and the supporting arm 47. First, when the tool head 6 is raised and fixed to the drive mechanism 4, the upper end of the rotating shaft 54 is splined to the lower end of the output shaft 14.

In order to fix the tool head 6 to the drive mechanism 4, a plurality of locking members 55, for example four, are provided on the upper surface of the tool head 6.
is fixed. These locking members 55 have engagement grooves 56 that are approximately T-shaped in cross section, and are fixed so that these engagement grooves 56 extend along the circumference around the rotation center of the tool head 6. Placed. On the other hand, four clamp cylinders 57 are fixed and supported on the upper surface of the elevating table 12 in the drive mechanism 4, corresponding to each of the locking members 55. These clamp cylinders 57 are arranged with their axes vertical,
The rod 58 movably penetrates the lifting table 12 and protrudes below the lifting table 12, and the lower end of the rod 58 has a substantially T-shaped retainer that can be engaged with the locking groove 56 of each locking member 55. A joint portion 59 is provided.

When each clamp cylinder 57 is extended, the engaging portion 59 of each rod 58 is connected to the connecting collar 31 and the supporting arm 47.
It is in a position where it can engage with the locking member 55 of the tool head 6 placed above, and by contracting the clamp cylinder 57 with the engaging portion 59 engaged with the locking member 55, the tool head 6 is pulled upwards.

Further, a plurality of, for example, four, positioning bins 60 are erected on the upper surface of the tool head 6, and four fitting tubes 61 into which the respective positioning bins 60 can be fitted are fixed to the lower surface of the lifting table 12. When the tool head 6 is pulled up by the clamp cylinder 57, each positioning pin 60 is fitted into the fitting tube 61, thereby positioning the tool head 6.

Moreover, the outer surface of the positioning bin 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 cylinder 61, thereby preventing further lifting operation. Along with being
A tool ladder 6 is fixed to a 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, a cutting tool 63 is fixedly installed on one side of the boring bar 7 in a manner corresponding to the spacing between the respective bearing holes 11 in the workpiece W to be bored.

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. The adapter 152 and the mounting member 153 are The adapter 152 and the attachment member 153 are firmly connected by engaging each other by abutting and slightly relative angular displacement, and by screwing the screw member 154 facing the outer surface of the adapter 152.

The boring bar 7 has a boring bar main body 7a including a cutting tool 63, and a rod-shaped connecting portion 7b for fixing to the handle member 153 of the connecting mechanism 151.
56, and between the upper part of the boring bar 7, that is, the mounting member 153 and the flange 156,
A support tube 158 is attached to the outer surface of the connecting portion 7b with a pair of bearings 157 interposed therebetween. This support tube 158 is supported by the support jig 8, and an annular path 159 that opens downward is defined between the support tube 158 and the flanges 155, 156 of the boring bar 7.

Referring also to FIG. 6, a presser plate 160 for holding down the outer ring of the bearing 157 is fixed to the upper end of the support cylinder 158, and the presser plate 160 extends upwardly and bends outwardly. A connecting arm portion 161 is integrally provided. Furthermore, the connecting arm portion 161 and the support cylinder 158 have passages 162 and 163 for supplying fluid, such as air, to the annular passage 159.
A fluid supply means 164 is connected to the passage 162.

The fluid supply means 164 includes a valve body 165 suspended from the tool head 6 and a pallbrond 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. . Moreover, the valve body 16
A fluid supply conduit 169 is connected to the upper end of 5. Further, on the inner surface of the insertion hole 168, a plurality of 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 is provided at equal intervals in the axial direction. Fluid supply lines 173, 1, 74, and 175 are connected to 171 and 172, respectively.

In FIG. 7, each fluid supply pipe line 169°173~
175 is connected to a fluid manifold 176 secured to the top surface of the tool head 6. This i-body manifold bottom 17
6 is four connection holes 177, 178, 179, 180 that communicate with each fluid supply pipe line 169, 173 to 175 individually.
The lifting platform 12 has connection holes 177 to 180.
Connection holes 181, 182, 183, 1 that can communicate individually with
A fluid manifold 184 having 84 is secured. Both fluid manifolds 176 and 185 are connected to each other when the tool head 6 is pulled upward and fixed to the lifting platform 12, and at that time, the connection holes 177 and 181;
8,182; 179°183; 180,184 communicate with each other.

In addition, each connection hole 181 to 184 of the fluid manifold 185
Fluid supply pipes 186, 187, 188, and 189 are individually connected to the fluid supply pipes 186 to 189.
189 are commonly connected to a fluid supply source 190. Furthermore, solenoid valves 31 that operate for each type of boring bar 7 are located 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. S
2. S3 and pressure switch 191, 192° 193
are provided respectively. These pressure points 191~
193 is activated when the pressure within the fluid supply pipes 187 to 189 exceeds a certain value.

In FIG. 8, the valve rod 166 has a communication passage 194 extending over its entire length, and is fitted and fixed to the connecting arm 161. Thereby, the communication passage 194 is made to communicate with the passage 162, and the valve rod 166 is vertically arranged. An enlarged portion 195 is provided at the upper end of the valve rod 166, and the enlarged portion 195 is inserted into the insertion hole 16 of the valve body 165.
It has an outer diameter large enough to be able to slide on. Moreover, enlarged part 19
5 is selected to be slightly larger than each of the annular grooves 170 to 172 in the valve body 165, and the outer surface of the enlarged portion 195 has grooves that slide into the inner surface of the insertion hole 168 on both sides of the annular grooves a170 to 172. abutting annular seal member 196;
197 is fitted.

The length of this pallu blonde 166 is determined according to the outer diameter of the corresponding boring bar 7, and therefore,
Each annular groove 170-172 has a corresponding boring bar 7
According to the gl.
Be grudged.

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 angularly displacing the jig carrier 64 around the vertical axis, the desired support jigs 8 can be attached to the machining station. Can be brought to John S.

The lower outer surface of the pillar 3 has a cross section that opens downward.
A U-shaped upper guide rail 65 is fixed along an imaginary circumference centered on the center position of the support 3, and a cross section that opens upward is provided below at a distance from the upper guide rail 65. A lower guide rail 66, which has a U-shaped surface and extends along an imaginary circumference corresponding to the upper guide rail 65, is fixed.

The jig carrier 64 is arranged between the upper and lower guide rails 65 and 66, and on the upper part of the jig carrier 64, a plurality of rollers 67 that move within the upper guide rail 65 are supported with a space between them. At the lower part of the jig carrier 64, a plurality of rollers 68 rolling on the lower guide rail 66 are supported with a space between them, and a plurality of rollers 68 rolling on the upper outer side of the lower guide rail 66 are supported. rollers 141 are supported with a space between them. Therefore, the jig carrier 64 is
It is rotatable about a vertical axis guided by lower guide rails 65,66.

In order to rotate the jig carrier 64, an indexing mechanism 69 is arranged at the bottom of the column 3.

This index mechanism 69 is driven by an index motor 70
and a gear box 71 containing a gear train (not shown) for decelerating and transmitting the driving force of the index moke 70;
The driving force from the driving gear 72 and the gear box 71 is transferred to the driving gear 7.
and a gear train 73 for transmitting data to Gear box 71
is fixed to the lower part of the support column 3, and the index mask 70 is fixed to the lower part of the gear box 71.

On the other hand, an internal gear 74 is fixed to the lower part of the jig carrier 64, and the drive gear 72 meshes with the upper gear 74.

Therefore, when the index moke 70 is actuated, the driving gear 72 causes the internal gear 74, that is, the jig carrier 64
is driven to rotate.

The support jig 8 is basically a rectangular jig main body 75 and 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 is provided so as to protrude from the shaft body 75 so as to be located below the workpiece W. Support holes 78, 79 having vertical axes are provided concentrically in both bearing parts 76, 77.

Moreover, the inner diameter of the upper support hole 78 is determined so that the support cylinder 158 disposed at the upper part of the boring bar 7 can be slidably inserted thereinto. 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 and protrudes in the same direction as the two wheel receivers 76 and 77.
A guide hole 83 concentric with the support holes 78 and 79 is bored in the support hole 78, 79. This guide hole 83 is formed in a melted shape so that the hydro 3 of the boring bar 7 can be inserted therethrough.

Such a support jig 8 is supported by the jig carrier 64 so that it can 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 on each of the bearing parts 7.
6.Protrudes on the opposite side from 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 ball holding cylinders 88 corresponding to the rain support protrusions 84 and a pair of ball holding cylinders 88 corresponding to the rain support protrusions 85 are provided at positions spaced apart by 90 degrees in the circumferential direction. A pair of non-holding cylinders 89 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 on which the lower surfaces of the lower support protrusions 84 and 85 are placed are respectively provided. Further, from the protruding ends of both holding cylinders 88 and 89, a pressing bottle 9 is inserted.
2.93 respectively protrude, and these pressing bottles 9
2.93 are biased in the projecting direction by springs 94.95 housed within each holding cylinder 88.89.

According to this structure, the upper and lower support protrusions 84 of the support jig 8
, 85 are placed on the protrusions 90°91 on the jig carrier 64 side, the support jig 8 is pressed by the pressing pins 92, 93, and the stoppers 86, 87 abut against the protrusions 90, 91. It is supported by the jig carrier 64 in this state. When the support jig 8 is brought to the position of the processing station S in this state, the axes of both the support holes 78 and 79 of the support jig 8 and the guide hole 83 are directed outward from the axis of the boring bar 7 above them. The supporting jig 8 is used for boring.
It is necessary to move it close to the jig carrier 64 side and fix it.

Therefore, at the position corresponding to processing station S,
A jig clamping cylinder 96 corresponding to the upper part of the jig main body 75 and a jig clamping cylinder 97 corresponding to the lower part of the jig main body 75 are disposed on the sides of the jig main body 75 . Rods 98 and 99 of these jig clamp cylinders 996 and 97 extend outward along one diameter line of the jig carrier 64, and the ends of the rods 98 and 99 are connected to the clamp members 100 and 99, respectively.
101. Also, each clamp member 1oo
, toi is supported by the support column 3 with its midway as a fulcrum, and rotates around the horizontal axis in response to the expansion and contraction operations of the jig clamp cylinders 96 and 97.

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

Also, on the side of the support column 3 facing the processing station S, there are four knock bottles 10 having a regulating stepped portion 104 facing outward.
5 are provided in a protruding manner, and four positioning holes 106 are bored in the jig main body 75 corresponding to the knock bottles 105.

In the part corresponding to the processing station S, extending between the lower part of the support column 3 and the lower part of the lifting platform 12 of the drive mechanism 4,
A bellows-shaped cover 107 is provided to cover the threaded rod 15. Therefore, the threaded rods 15 are always layered regardless of the movement of the drive mechanism 4 up and 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 the guide rail 11 with the workpiece W supported and fixed.
0 and a pallet 111 guided by 0. The pallet guide rail 110 includes an upper guide portion 114 in which a plurality of guide rollers 113 are arranged between a pair of guide plates 112 facing each other, and a pair of guide plates 115 facing each other.
It is configured by connecting a lower guide part 117 with a plurality of guide rollers 116 arranged therebetween by a connecting member 118,
It 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 the upper and lower guide parts 114 and 117 of the pallet guide rail 110 and transported to a position corresponding to the processing station S.
It is carried out from the processing station S. This palette 11
1 includes a plurality of positioning pins 11 that are fitted into the workpiece W.
9, upper and lower clamp members 120 and 121 for engaging and fixing the work W, and an abutment pin 122 that abuts the work W. By fitting the positioning pin 119 to the workpiece W and bringing the workpiece W into contact with the abutment pin 122, and fitting the clamp members 120, 121 to the workpiece W, the workpiece W makes the bearing hole 11 vertical and rotates the bearing hole 11.
Fixed to 1.

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. The workpiece support mechanism 9 includes a movable table 125 that is movable in a horizontal direction perpendicular to the transport mechanism 10, a pressing cylinder 126 for horizontally driving the movable table 125, and a press cylinder 126 that abuts the movable table 125 and presses the movable table 125.
a stop position switching cylinder 127 that regulates the horizontal movement of 5 in two stages, and a reversing motor 128 fixed to the moving table 125.
and a barrel 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, and the moving table 125 has a pressing cylinder 1.
Twenty-six rods 132 are connected. 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 press cylinder 126 to expand and contract, 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 facing the movable table 125 in a portion near the processing station S, and switches the stop position of the movable table 125 between a state in which the loft 133 is extended and a state in which it is contracted. be able to. That is, when the movable base 125 is brought into contact with the rod 133 in the extended state, and when the movable base 125 is brought into contact with the rod 133 in the contracted state.
The stop position of the movable table 125 changes depending on when the movable table 125 is brought into contact with the movable table 125.

The output shaft 129 of the reversing motor 128 rotatably passes through the moving table 125 and protrudes toward the processing station S.
A pallet holding frame 130 is fixed to the tip of this output shaft 129. The pallet holding frame 130 is basically formed into a flat plate shape, and the upper and lower ends of the pallet holding frame 130 have the upper and lower ends of the transport mechanism 10,
Guide grooves 134, 13 corresponding to lower guide parts 114, 117
5 are provided respectively. Furthermore, the pallet holding frame 13
0 is provided with a pair of clamping cylinders 136 for fixing the pallet 111 by coming into contact with the pallet 111, and the clamping cylinders 136 are extended with the pallet 111 fitted into the guide grooves 134 and 135. As a result, the pallet 111 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 and fixed to a position where the axis of the bearing hole 11 is aligned with the boring bar 7 by bringing the workpiece W to a position where the axis of the bearing hole 11 is aligned with the boring bar 7 by extending the pressing cylinder 126 while the stop position switching cylinder 127 is contracted. can.

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 boring bar 7, a pair of guide posts 138 having a fitting hole 137 at the tip are provided on the pallet ill, facing toward the column 3 side. It is installed protrudingly. On the other hand, the jig main body 75 of the support jig 8 has a positioning pin 14 having a fitting protrusion 139 at its tip that can be fitted into the fitting hole 137.
0 is set protrudingly.

Paying attention again to FIG. 2, one of the four tool heads 6
A measuring bar 201 extending vertically is fixed to one end for measuring the diameter of the bearing hole 11 in the workpiece W after boring.

In FIGS. 11, 12, and 13, a measurement bar 201 has a cylindrical shape, and a measurement head 203 is attached to the lower end of this measurement bar 201 via an attachment member 202. This measuring head 203 is basically formed into a short cylindrical shape, and has a pin 2 press-fitted into the lower end of the mounting member 202.
04 and is fixed to the mounting member 202 by a screw member 205 screwed onto the tip of the bottle 204.

Furthermore, the bottle 204 is serrated to prevent the measuring head 203 from rotating.

The outer circumferential surface of the measurement head 203 is formed by connecting four arcuate surfaces 206 spaced apart by 90 degrees with flat surfaces 207, and the outer circumferential surface is connected to the mounting member 20.
It is formed to be slightly swollen than the outer peripheral surface of No. 2.

Grooves 208 extending in the axial direction are provided in the arcuate surface 206, and jet nozzles 209 are opened approximately at the center of each of these grooves 208.

In FIG. 14, a pair of ejection nozzles 209, 209;
The recommunication passages 210 and 211 are communicated with passages 212 and 213 extending in the axial direction, respectively.

On the other hand, the measurement bar 201 and the mounting member 202 have a pair of passages 214 and 21 corresponding to the passages 212 and 213.
5; 216 and 217 are respectively bored extending in the axial direction, as shown in FIGS. 15 to 18;
Both passages 216 and 217 of the mounting member 202 and both passages 211 and 213 of the measurement head 203 are connected to the flexible tube 21.
8,219 are interconnected.

Both passages 214 , 215 of the measuring bar 210 communicate with a passage 220 provided in the tool head 6 . Moreover, when the tool head 6 is fixed to the lifting platform 12, this passage 220 connects to the fluid supply source 190 via the fluid supply pipe line 221.
connected to. Further, a back pressure detector 222 is connected in the middle of the fluid supply conduit 221 .

A master gauge 223 is attached to the measurement bar 201 so as to be able to move relative to it in the axial direction between a front end position surrounding the measurement head 203 and a rear end position. This master gauge 223 is basically cylindrical, includes a first reference hole 224 and a second reference hole 225 coaxially, and is fixed to a sliding member 226.

The sliding member 226 is basically cylindrical, and the mounting member 2
A pair of sealing members 227 and 228 are provided on the inner surface of the measuring bar 201 and the measuring bar 201, respectively. This sliding member 226 is connected to the measuring head 2 by the master gauge 223.
03 and the uppermost position shown by the chain line in FIG.
3 is slightly more bulged than the mounting member 202, thereby preventing the sliding member 226 and the master gauge 223 from falling off downward.

Further, the master gauge 223 is in contact with the upper bearing portion 76 of the support jig 8, and the master gauge 223 is in contact with the upper bearing portion 76 of the support jig 8, and is
The measurement head 203 can be inserted into the support hole 78 of the bearing section 76 . Therefore, when the measuring bar 201 is lowered, the master gauge 223 is prevented from lowering by the bearing 76, and the measuring head 203 and the measuring bar 201 are prevented from lowering.
only descends.

Next, the operation of this embodiment will be described. 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 is moved through both guide grooves 13 of the pallet holding frame 130.
4,135 fits. By extending the clamp cylinder 136 in this state, the pallet 111 is fixed to the pallet holding frame 130. Next, while keeping the stop position switching cylinder 127 in the extended state, the pressing cylinder 1 is
26 is extended, the moving table 125 moves until it comes into contact with the rod 133 of the stop position switching cylinder 127, and the work W is moved so that the axis of the bearing hole 11 is slightly on the opposite side of the column 3 from directly below the polling half. Move to a position that is shifted.

By operating the feed motor 16 of the feed mechanism 5 with the workpiece W moved in this way, the holder 15
is rotated to 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 degrees, and the polling half is stationary at a fixed position with each bite 63 accurately facing the direction opposite to the column 3. 19, the boring bar 7 can be inserted into the bearing hole 11 without each hydro 3 interfering with the bearing hole 11. With the boring bar 7 lowered, the support cylinder 158 provided on the polling half 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 lower end of the boring bar 7 is fitted into the support hole 78 of the support jig 8. The guide hole 83 is inserted into the middle.

After the polling half is slidably and rotatably supported by the lowered support jig 8, the stop position switching cylinder 1
27 is contracted and the press cylinder 126 is extended again. As a result, the moving table 125 can move forward by the amount that the rod 133 of the stop position switching cylinder 127 is reduced, and the workpiece W supported by the valentine 111 fixed to the pallet holding frame 130 is moved several liters toward the column 3 side. Moving. Therefore, the axis of the workpiece W is coincident with the axis of the polling half, as shown in FIG. Moreover, at this time, the workpiece W comes into contact with the knock pin 105 of the support jig 8,
Further movement of the workpiece W is prevented and the workpiece W is positioned.

When the workpiece W is positioned with the axis of its bearing hole 11 aligned with the polling half, each bite 63 of the boring bar 7 is located above each bearing hole 11, and the boring bar 7 is rotated by the drive mechanism 4. Each cutting tool 63 is lowered by the feeding mechanism 5 while
Boring of the bearing hole 11 is performed by.

At the start of this boring process, whether the boring bar 7 is appropriate for the diameter of the bearing hole 11 is checked by operating the pressure switches 191 to 193. That is, in the case shown in FIG. 8, since both sides of the annular groove 170 are blocked by the pallbrond 166 when the solenoid valve S1 is opened, only the pressure switch 191 is operated, and the pressure switch 191 is operated in response to the signal from the pressure switch 191. The type of polling half can be accurately confirmed by, for example, turning on an indicator light (not shown).

Moreover, during the hollowing process, the fluid supply source 19
The fluid, for example air, from
8. The cutting fluid is supplied to the annular path 159 through the communication path 194 and the paths 162 and 163, and is ejected downward from the annular path 159, thereby reliably preventing cutting fluid from entering the bearing 157.

When the boring process is completed, the stop position switching cylinder 127
starts to extend again. As a result, the movable table 125 moves back a few steps 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 6
3 does not come into contact with the bearing hole 11, so no scratches such as cutter marks are left in the bearing hole 11. After that, the press cylinder 126 is reduced and the pallet holding frame 111 is
is moved back to the position of the transport mechanism 10, and the clamping cylinder 136 is further reduced to release the clamp state of the pallet 111 to the pallet holding frame 130, and then the pallet 111 is carried out from the processing station S by the transport 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 machining station S according to the change in the type tn. It can be placed in any position at any time.

That is, by operating the index motor 43 of the index mechanism 42, the tool head 6 supporting a desired polling half is moved to a position corresponding to the processing station S, and the tool head 6 is moved by the clamp cylinder 57 to the drive mechanism 4. can be fixed to.

Further, by operating the index moke 70 of the index mechanism 69, a desired support jig 8 is moved to a position corresponding to the processing station S, and by operating the jig clamp cylinders 96 and 97, the support 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 work W, and it is possible to cope with high-mix low-volume production.

When measuring the diameter of the bearing hole 11 after the boring process is completed, the measurement bar 201 is moved to a position corresponding to the processing station S, and the tool rad 6 is fixed to the lifting table 12. At this time, the master gauge 223 is at the lowest position and surrounds the measurement head 203. Moreover, a first reference hole 224 faces the jet nozzle 209, and a back pressure detector 222 detects the back pressure generated between the measuring head 203 and the master gauge 223 due to fluid pressure, such as air pressure, jetted from the jet nozzle 209. do.

Next, lower the measurement bar 201 and measure the master gauge 2.
23 is brought into contact with the bearing part 76, and the measurement head 203 is moved slightly downward relative to the ejection nozzle 209 to face the second reference hole 225.
Detected at 22. This performs the reference adjustment of the back pressure, that is, the zero adjustment and the magnification adjustment.

Thereafter, as in the above-mentioned polling half, the axis of the bearing hole 11 is aligned with the axis of the measuring bar 201, and the diameter of the bearing hole 11 is measured by lowering the measuring head 203 as shown in FIG. can do.

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

C9 Effects of the Invention As described above, according to the present invention, the master gauge is attached to the measurement bar so as to be relatively movable in the axial direction from the tip position surrounding the measurement head to the rear end position, and the master gauge is attached to the measurement bar at the front position of the hole. Although the measuring bar and the measuring head are allowed to move forward into the hole, a jig that prevents the forward movement of the master gauge is fixedly provided. No work is required, it is safe, and the adjustment time is shortened. Furthermore, when measuring the hole diameter, the master gauge moves axially rearward relative to the measuring bar and does not provide support to the hole diameter measurement.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a boring device, in which FIG. 1 is an overall perspective view of the boring device, FIG. 2 is an overall vertical sectional view of the boring device, Figure 3 is an enlarged sectional view taken along line I-I in Figure 2, and Figure 4 is the rV in Figure 2.
5 is an enlarged longitudinal sectional view of section V in FIG. 2, FIG. 6 is a view in the direction of the ■ arrow in FIG. Figure 9 is an enlarged longitudinal sectional view of the main body and pallu blond, Figure 9 is an enlarged cross-sectional view of the IX=TX line in Figure 2, a large cross-sectional view is an enlarged view of Figure 2 and an enlarged vertical cross-sectional view of the master gauge, Fig. 12 is an enlarged view of x in Fig. 11, Fig. 13 is a sectional view taken along the line
The enlarged cross-sectional view of the IV-XIV line, Figure 15, corresponds to xv in Figure 11.
-xv line sectional view, Fig. 16 is x vr -x of Fig. 11
17 is a sectional view taken along the line X■-X■ in FIG. 11, FIG. 18 is a sectional view taken along the line X■-X■ in FIG.
Fig. 9 is an enlarged vertical cross-sectional view of the main part showing the boring bar inserted into the bearing hole of the workpiece, Fig. 20 is an enlarged longitudinal cross-sectional view of the main part when the axis of the bearing hole of the workpiece is aligned with the boring bar; FIG. 21 is an enlarged longitudinal cross-sectional view of the main part when measuring the hole diameter with the measuring head. 8... Support jig, 11... Bearing hole as a hole to be measured, 201... Measuring bar, 203... Measuring head, 209... Spout nozzle, 223... Master gauge, 224 .225... Reference hole patent applicant Honda Motor Co., Ltd. Figure 7 Figure 8 Figure 21 Figure 13 Figure 12 Figure 24 U Figure 20 Whistle 19 r! J ■ 11″

Claims (1)

[Claims] A measuring bar movable along the axis of the hole to be measured and a plurality of jet nozzles fixed to the tip of the measuring bar are provided on the outer peripheral surface in order to measure the hole diameter by the back pressure generated between the inner surface of the hole. A hole diameter measuring device including a measuring head that is provided and can be inserted into the hole, and a master gauge that can surround the measuring head and has a reference hole for setting the reference value of the back pressure. The gauge is mounted on the measuring bar so as to be relatively movable in the axial direction from a leading end position surrounding the measuring head to a trailing end position, and a gauge is mounted on the measuring bar at a forward position of the hole.
A hole diameter measuring device characterized in that a jig is fixedly disposed to allow the measuring bar and the measuring head to move forward into the hole, but to prevent the master gauge from moving forward.