JPH07328816A - Inverted spot facing molding processing device - Google Patents

Abstract

PURPOSE:To easily and highly accurately perform processing of a inverted spot facing by supporting this inverted spot facing molding processing device in the opening part of an outer shaft provided on the tip of an inner shaft by means of a pin, inclining and sliding it and continuously connecting a cutter plate to the lower side of a roller holder having rollers on both sides. CONSTITUTION:An outer shaft 12 is lowered while a slide ring 30 rotates and slides. Then, each roller 37 with a shaft attached to the left and right of a roller plate 14 is, while rotating on the upper surface of a step disk 36, inclined and moved by means of a cam pin 28 engaged with a plate cam hole 27 in the same direction as that of the cam mechanism 16 of a cutter 17. As a result, an inverted spot facing is carried out in such a manner that the lower surface of a flange 1 is cut by the cutting edge 17a of the cutter 17, feeding thereof is continued until a specified cutting depth is reached, the upper end surface 30a of the slide ring 30 is fitted into the outer peripheral groove of the outer shaft 12 and brought in contact with a stop ring 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back spot facing forming apparatus for forming a bolt seat in a bolt hole portion of a pressure vessel flange joint.

[0002]

2. Description of the Related Art A flange joint bolt portion of a plant pipe, which is a workpiece, is, for example, shown in FIGS. 9 and 10 (AA in FIG. 9).
The structure is as shown in the arrow view). That is, the plant piping flanges 1 and 2 have bolts 3 at several places around the flanges.
And the nut 4 is tightened and fixed. Each of the bolt holes 1a and 2a into which the bolt 3 is inserted is machined from the flange surface side 5, and the seats 3a and 4a of the bolt 3 and the nut 4 are required to maintain a right angle with the bolt holes 1a and 2a, respectively. To be done. In this case, there is no problem as long as it has a shape of the work piece that can be counterbored from the same direction as when the bolt hole is processed, but the elbow 6 is welded as shown in FIG. If the flange 7 is attached to the side opposite to the side where the nut is tightened and fixed, it becomes extremely difficult to carry out counter boring.

Usually, as shown in FIG. 8 (a), for counter boring, after a bolt hole is drilled by a general-purpose radial drilling machine 8 with a drill or the like, a counterboring bar 10 is attached to a spindle 9 of the drilling machine.
Insert the countersink bite 10a from the back side of the work piece 1 as shown in FIG. 8 (b), set the bite protrusion amount R with a caliper, scale, etc. and fix it with the tightening bolt 10b.
Further, in FIG. 8 (c), the counterbore depth h is set from the flange thickness t to the radial drilling machine 8 on the machining depth scale, and after machining in FIG. 8 (d), the counterbore bite 10a is removed, and FIG. The method of pulling out the spot facing rod 10 in e) is often adopted.

[0004]

As shown in FIG. 11 (a), when the bolt seats of the flanges 1 and 2 are not machined and the bolts 3 and nuts 4 are used for tightening and fixing,
If the bolt holes 1a and 2a and the receiving parts of the bolts and nuts are not at right angles as in (b), the bolts and nuts may partly float up as in c part, or the bolts may bend as in d part. However, it is not preferable in terms of quality and performance.

Further, as shown in FIGS. 13 (a) to 13 (e), in the conventional method of inserting a spot facing rod and tightening a spot facing bite from the back side to form a spot facing, when there are a large number of bolt holes. Each time, the counterboring tool is attached, centered, cut, removed, and the counterbore is repeatedly inserted and removed.
In the case of counter boring of a large diameter hole due to work loss and extremely poor efficiency, the cutting resistance becomes large as shown in Fig. 14, the counter boring tool 10a is struck in the f direction, and the squareness to the bolt hole or the bolt seat It becomes difficult to obtain the flatness of, and this makes the seat of the bolt and nut hitting bad and not good. Furthermore, if a sudden cut is made, the feed amount cannot be increased and the operator must manually feed it.The feed direction will also be reversed, so if you do a back facing with a normal radial drilling machine, insert it into the spindle hole. Since the counterbore bar could easily come off and the work piece might float, it was a work that required experience in terms of work safety and processing technology.

The present invention has been made in view of the above circumstances, and an object thereof is to process a flange bolt hole in advance and then
In the case of counter boring on the back side, it is possible to provide a back counter boring machine that can be easily and accurately machined with high efficiency by omitting operations such as mounting, centering, processing and removing a counter boring tool on the back side. is there.

[0007]

In order to achieve the above object, the first aspect of the present invention is to provide a back face counter boring machine for forming a counter boring hole of a hole formed in a workpiece.
A drive mechanism having a main shaft that rotates around an axis and moves back and forth along the axial direction, and one end is coaxially attached to the main shaft of the drive mechanism to integrally operate, and the other end is a free tip to be processed. An outer shaft that can be inserted into a hole formed in an object, and an outer shaft that can rotate integrally with the outer shaft and is slidable in a certain range in the axial direction, and is biased by a spring toward the tip side of the outer shaft. Inner shaft, a roller holder provided at the tip of the inner shaft, supported by pins in the opening of the outer shaft, slidably slid, and rollers attached to both sides, and a connecting shaft below the roller holder. With a cutter plate connected with
It is characterized in that the cutter plate is composed of a plate cam hole which can be tilted at a pin position supporting a roller holder below the opening of the outer shaft.

According to a second aspect of the present invention, in the backspot forming apparatus according to the first aspect, a return screwed inside a stopper box that is circumscribed on the outer surface of the outer shaft and is mounted via a slide bearing that can slide up and down. It is characterized in that by rotating the drum, the roller and the roller holder are returned downward, and the cutter after processing is separated from the processing surface.

According to a third aspect of the present invention, in the back pocket forming apparatus according to the first aspect, a cutter that can be retracted from the inside of the outer shaft in a direction intersecting with the axial center is integrally provided on the inner shaft. A positioning mechanism that stops the inner shaft by contacting the surface of the workpiece at the forward position where the cutter has moved to the forming position, and a forward movement of the outer shaft from the stopping position of the inner shaft by the positioning mechanism. And a cam mechanism for projecting the cutter from the outer shaft and retracting the cutter to and from the outer shaft in association with a reverse operation of the outer shaft, and further after the cutter has moved to a molding processing position, the cutter It is screwed in the stopper box downward inward so as not to hinder the return of the stopper box. The step disk and the switching lever protruding from the side surface of the stopper box are swung to move the guide roller protruding toward the opening of the outer shaft downward to separate the cutter cutting edge from the workpiece surface. It is characterized by being configured with a mechanism.

[0010]

According to the back spot facing forming apparatus of the present invention, at the time of forming a hole, the outer shaft is first inserted into the hole of the workpiece by the axial forward movement of the main shaft of the drive mechanism.
At this time, the inner shaft is slidable in the axial direction within a certain range in the outer shaft, and is urged toward the tip side by the spring. Initially, the inner shaft moves forward integrally with the outer shaft in the axial direction. When the outer shaft advances toward the work piece to a predetermined position, the positioning mechanism comes into contact with the end surface of the work piece, and the inner shaft integral with the positioning mechanism stops. Even after the inner shaft is stopped by the contact of the positioning mechanism with the workpiece, the outer shaft is advanced against the biasing force. When only the outer shaft moves forward with the inner shaft stopped, the cam mechanism operates due to the relative movement of the outer shaft and the inner shaft, and the cutter moves and projects from the outer shaft in a direction intersecting the axial direction.

The amount of protrusion is determined by the amount of movement of the outer shaft. The rotation of the outer shaft by the drive mechanism can be performed at any time, for example, at the time of the first axial movement. The cutter also rotates in accordance with the rotation of the outer shaft, and the inner surface on the inner side of the hole of the workpiece is cut according to the amount of protrusion of the cutter, whereby molding can be performed. In addition, an oil supply mechanism is attached below the stopper box, a predetermined amount of cutting oil is supplied during cutting, the cooling state is maintained during cutting, and the generated chips are discharged to the outside, preventing chip clogging. The sharpness is improved and the processing accuracy is improved.

After the cutting is completed, the operation reverse to the above is performed, that is, the outer shaft is retreated and the switching lever is swung to move the stick disk plate downward, so that the cutter reaching the predetermined forming position moves the cutter surface to the work surface. Disconnect from and return inward of the outer shaft. After that, the outer shaft retracts, and when the outer shaft retracts to a position beyond the range where it can slide relative to the inner shaft, the inner shaft also retracts. Next, the tip of the outer shaft is retracted to a position where it is pulled out from the hole, and one predetermined process is completed.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the present invention, which is a state before cutting. 3 is a cross-sectional view taken along the line BB of FIG. 1, FIG. 2 is a vertical cross-sectional view showing a state in which the cutter has been removed from the processing surface after the back facing, and FIG. 4 is a cross-sectional view taken along the line CC of FIG. 2 is a DD sectional view of FIG. 2, and FIG. 6 is an EE sectional view of FIG.

As shown in FIGS. 1 to 6, the hole forming apparatus of the present embodiment has a drive mechanism 11, an outer shaft 12,
The inner shaft 13, the roller plate 14, the positioning mechanism 24, the cam mechanism 16, the cutter 17, the step disk 36 and the like are included.

The drive mechanism 11 has a main shaft 11a connected to a drive unit (not shown) such as a motor and gears. The main shaft 11a rotates around its axis and moves back and forth along the axial direction (vertical direction in the drawing), and an opening 11b for shaft insertion is formed in the tip end surface (lower end surface).

As shown in FIGS. 1 to 3, the outer shaft 12 has a large diameter and long columnar shape, and one end (the upper end and the base end in the figure) of the tapered shape is the opening 1 of the main shaft 11a of the drive mechanism 11.
1b is coaxially fitted and inserted so as to integrally operate with the main shaft 11a, and the other end (the lower end and the tip in the drawing) is a free end. The free end of the outer shaft 12 can be inserted into a bolt hole 1a that is preprocessed in the flange 1. In addition, slit-shaped slots 18 and 19 penetrating in a direction perpendicular to the axis are formed in the axially intermediate portion and the free end side of the outer shaft 12, respectively.

The inner shaft 13 is urged to the other end side (center part in the figure) by a compression coil spring 20 inserted into a center hole 12a formed in the outer shaft 12. A roller plate 14 is attached to the lower end of the inner shaft 13, and the lower part of the roller plate 14 is connected via a link 21 so as to be swingable.
Further, the cutter 17 is connected below the link 21, and the roller plate 14, the link 21, and the cutter 17 are connected by inserting connecting pins 22 and 23, respectively. The cutter 17 is in the form of an elongated plate and is formed in an L shape and has a cutting edge 17a for spot facing. The cam mechanism 16 for driving the cutter 17 is provided with a pair of inclined cam holes 25 formed in the plate portion of the cutter 17, and the cam holes 2 provided at the tip side axial center position of the outer shaft 12.
5 and a pair of cam pins 26 that engage with each other.

When the inner shaft 13 is at the predetermined pull-up position in FIG. 1 with respect to the outer shaft 12,
The cam pin 26 is engaged with the upper end portion of the cam hole 25, and the cutter 17 is in a state of being housed in the groove hole 18 of the outer shaft 12. On the other hand, when the inner shaft 13 has moved (moved forward) to a predetermined pull-down position with respect to the outer shaft 12, as shown in FIG.
The cam pin 26 engages with the lower end of the cutter 17, and the cutter 17 is pushed out in a direction intersecting with the axial center of the outer shaft 12 and laterally protrudes from the groove 18. When the cutter 17 rotates together with the outer shaft 12 in this state, counterbore processing, that is, forming processing is performed.

The roller plate 14 is positioned below the inner shaft 13, is biased by the inner shaft 13, is provided in the middle of the outer shaft 12, and is provided with a cam pin 28 that engages with a plate cam hole 27, so that the cutter 1 is provided.
The cam mechanism 16 of No. 7 tilts and moves in the same direction, and the cutter 1
7 and a link 21 are connected and move in parallel in the same direction.

The positioning mechanism 24 sets the cutting position as described above, and includes a slide ring 30 slidably fitted to the outer peripheral surface of the axially intermediate portion of the outer shaft 12 via a slide bearing 29. It comprises a cylindrical stopper box 15 screwed onto the outer peripheral surface of the slide ring 30 and a cylindrical stopper 31 screwed onto the lower end of the stopper box 15. Further, in more detail, the stopper box 15 has a threaded portion 32.
The axial position of the slide ring 30 can be adjusted by adjusting the axial position of the slide ring 30, and the screw portion is fixed by the set screw 34 at the predetermined axial screw position.

Further, the stopper box 15 has a stepped portion 15a having a small diameter on the lower end side, and the stopper 31 is screwed onto the small diameter portion of the stepped portion 15a via a screw portion 33 on the inner circumference so that the axial position can be adjusted. At the screwed portion, both are fixed by a set screw 35 at a predetermined axial screwing position. Similarly, a disc-shaped step disk 3 is attached to the upper threaded portion of the inner peripheral threaded portion 33 of the small diameter portion of the step portion 15a.
6 are screwed together, and the roller 37 with a shaft having a built-in bearing is attached to the left and right protrusions of the roller plate 14 as the inner shaft 1.
3, the step lever 36 mounted on the outer peripheral side of the step disc 36 is rotated in the circumferential direction as shown in FIG.
The cutter plate 17 can be vertically moved together with the link 21 via the link 4.

The cutting oil is supplied from a cutting oil pump or the like by screwing a cutting oil nozzle 39 from the outer periphery of the lower portion of the stopper box 15 to the slit-shaped slot 18 of the outer shaft 12 from the nozzle 39. Through this, oil is applied to the processed portion 17a of the cutter plate 17.

Next, the operation of this embodiment will be described.
According to the back spot counter boring machine of the present embodiment, the counter boring can be performed on the lower rear surface of the bolt hole 1a formed in the flange 1 easily and efficiently.
The main spindle 11a of No. 1 is inserted into the flange hole 1a, and the stopper 31 is brought into contact with the surface 1b of the flange 1 to fix the whirl-stop shaft 40 screwed to the outer periphery of the upper portion of the stopper box 15 and then rotated to the main spindle 11a. When the inner shaft 13 built in the outer shaft 12 overcomes the compression of the coil spring 20 and is pushed upward when the automatic feed is gradually applied downwards at the same time, the stopper box 15 slides with the slide bearing 29 along with the slide ring 29. The outer shaft 12 descends as the 30 rotates and slides.

At this time, the shaft-mounted rollers 37 attached to the left and right of the roller plate 14 rotate in the same direction as the cam mechanism 16 of the cutter 17 by the cam pins 28 which engage with the plate cam holes 27 while rotating on the upper surface of the step disk 36. The slanting movement causes the cutting edge 17a of the cutter 17 to make a cut on the lower surface of the flange 1 and the feeding is continued until the cutting depth reaches a predetermined cutting depth.
The a is fitted into the outer peripheral groove of the outer shaft 12 and comes into contact with the stop ring 40 to carry out the back facing. At this time, since the cutting edge 17a of the cutter 17 receives the resistance during cutting and is in strong contact with the processing surface, the stopper box 1
5, the switching lever 38 mounted on the outer side of the roller 5 is swung to lower the step disk 36, and the roller plate 1
4, the link 21 and the cutter plate 17 are removed from the surface of the flange that is the workpiece by e, and the cutter plate 17 is smoothly returned in the state shown in FIG. 2 and then the automatic feed of the spindle 11a is released. When the state is returned to, the state of FIG. 1 is restored. Lower end surface 30 of slide ring 30
After confirming that b has reached the outer shaft lower limit contact portion 12a, the rotation of the main shaft 11a is stopped and the flange hole 1a
From the above, the entire backspot forming apparatus, which represents the outer shaft 12, is raised.

In addition, although the above-mentioned embodiment describes the back spot machining of the flange joint bolt hole of the plant piping, the present invention is not limited to this, and for example, as shown in FIG. If the structure is formed with an angle 41, the hole 1a can be tapered.

[0026]

As described above, according to the present invention,
When machining the flange bolt hole in advance and then machining the spot facing on the back side, after passing the spot facing rod as in the past, it is possible to omit the work steps such as mounting, centering, machining, and removing the spot facing bit on the back side. Therefore, there is an excellent effect that the counterbore can be easily and highly accurately and efficiently processed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention before cutting.

FIG. 2 is a vertical cross-sectional view showing a state in which the cutter has been removed from the processing surface after the back facing processing.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line CC of FIG.

5 is a cross-sectional view taken along line DD of FIG.

6 is a sectional view taken along line EE of FIG.

FIG. 7 is a sectional view showing an application example of the present invention.

FIG. 8 is a diagram showing a procedure for machining a back facing in the conventional method.

FIG. 9 is a cross-sectional view of a flange joint bolt portion of a plant pipe that is a workpiece.

10 is a cross-sectional view taken along the line AA of FIG.

FIG. 11 is a cross-sectional view of a flange without spot facing.

FIG. 12 is a partially cutaway side view of a container having a flange attached to the opposite side.

FIG. 13 is a view showing a back spot facing state on a general-purpose drilling machine.

FIG. 14 is a view showing a state in which the cutting tool is deformed due to cutting resistance in the back facing of the conventional method.

[Explanation of symbols]

1, 2, 7 ... Flange, 1a, 2a ... Bolt hole, 3 ... Bolt, 4 ... Nut, 3a, 4a seat, 6 ... Elbow, 8 ...
Radial drill press, 9 ... Spindle, 10 ... Counterbore, 10
a ... spot facing tool, 10a ... tightening bolt, 11 ... drive mechanism, 11a ... main shaft, 11b ... opening, 12 ... outer shaft, 12a ... center hole, 13 ... inner shaft, 1
4 ... Roller holder, 15 ... Stopper box, 1
5a ... Step, 16 ... Cam mechanism, 17 ... Cutter, 17a
... Cutting blades, 18, 19 ... Grooves, 20 ... Compression coil springs, 21 ... Links, 22, 23 ... Connecting pins, 24 ... Positioning mechanism, 25 ... Cam holes, 26 ... Cam pins, 27 ... Plate cam holes, 28 ... Cam pin, 29 ... slide bearing, 30 ... slide ring, 31 ... cylindrical stopper,
32, 33 ... Threaded portion, 34, 35 ... Set screw, 36 ... Step disk, 37 ... Roller with shaft, 38 ... Switching lever, 39 ... Nozzle, 40 ... Stop ring.

Claims (3)

[Claims] 1. A back spot facing forming apparatus for forming a spot facing of a hole formed in a workpiece, comprising: a drive mechanism having a main shaft for rotating around an axis and moving back and forth along the axial direction. One end is coaxially attached to the main shaft of the drive mechanism and integrally operates, and the other end is a free tip and can be inserted into a hole formed in the workpiece, and an outer shaft is provided at the center of the outer shaft. An inner shaft that is integrally rotatable and slidable within a certain range in the axial direction and is urged by a spring toward the tip side of the outer shaft, and an opening provided in the tip of the inner shaft in the outer shaft. It is supported by pins, slides at an angle, and is connected to a roller holder with rollers installed on both sides and a connecting shaft below this roller holder. And a plate cam hole capable of tilting the cutter plate below the opening of the outer shaft at a pin position for supporting a roller holder. 2. A back spot facing forming apparatus according to claim 1, wherein a return drum screwed inside a stopper box circumscribing an outer surface of an outer shaft and attached via a slide bearing capable of sliding up and down is swiveled. By doing so, the roller and the roller holder are returned to the lower side, and the cutter after processing is configured to be separated from the processing surface. 3. The backspot forming apparatus according to claim 1, wherein a cutter that can be retracted from the inside of the outer shaft in a direction intersecting with the axial center and the cutter integrally provided on the inner shaft are provided. A positioning mechanism that stops the inner shaft by contacting the surface of the workpiece at the forward position that has moved to the molding position, and the forward position of the outer shaft from the stopped position of the inner shaft by the positioning mechanism. A cam mechanism that causes the cutter to protrude from the outer shaft and retracts the cutter to and from the outer shaft in association with the reverse operation of the outer shaft; and further, after the cutter has moved to the molding position, returns the cutter. Steps that are screwed inward in the stopper box so that they do not interfere A detaching mechanism for detaching the cutter cutting edge from the work surface by rotating the disc and the guide lever protruding from the opening of the outer shaft by rotating the switching lever protruding from the side surface of the stopper box. A backspot forming device characterized by being configured from.