JP2010188484A - Inner surface machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner surface machining device capable of accurately positioning an edged tool, making the maximum diameter of a machining head inserted into a long shaft smaller than that of prepared holes disposed on both ends of the long shaft, preventing degradation of machining accuracy caused by reactive force of the edged tool during machining, and machining the inner surface of the long shaft accurately along the prepared holes. <P>SOLUTION: The inner surface machining device includes a fixing device 10 for fixing a tubular member (the long shaft 1), the machining head 20 capable of being inserted into the prepared holes 2 of the tubular member 1 in an axial direction, an axial moving means (a head moving means 30) for relatively moving the machining head 20 in the axial direction with respect to the tubular member 1, a rotating means (a rotating device 40 for the edged tool) for relatively rotating the edged tool 29 with respect to the tubular member 1, and a contact-detecting sensor 15 for detecting the contact of the edged tool 29 with inner surfaces of the prepared holes 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for processing the inner surface of a long shaft, such as a long shaft connecting a tubular member, for example, a jet engine turbine and a fan or compressor.

  In order to connect a turbine of a jet engine and a fan or a compressor, an elongated hollow shaft called a long shaft (for example, a total length of about 3 m, a main portion having an outer diameter of 10 to 20 cm) is used. Such a long shaft is thin for weight reduction and requires high rotation balance accuracy because it rotates at high speed together with the turbine. For this reason, it is difficult to apply a normal inner surface processing apparatus (for example, a boring machine), and a processing step as illustrated in FIG. 7 is applied.

That is, (A) after roughing the outer surface of the long shaft 51, (B) sulfur 53 is cast into the gap between the core bar 52 and the long shaft 51, and (C) a boring bar having substantially the same diameter as the core bar 52 after solidification of sulfur. 54, and (D) means for machining the inner surface with the tool 56 of the tip 55 while pulling out the boring bar 54.
By such means, the tip portion 55 of the boring bar 54 can be supported by the solidified sulfur 53, the center tool of the tip tool 56 is prevented, and the inner surface is machined together with the sulfur 53, thereby processing a long shaft with less inner diameter deflection. can do.

  Patent Document 1 is disclosed as an inner wall copying apparatus related to the present invention. For example, Patent Document 2 has already been disclosed as the above-described long shaft inner surface processing apparatus.

  Patent Document 1 discloses a “cutting device for copying the inner wall of a pipe”. When a cutting blade is applied to the cutting of the inner surface of a pipe such as a steel pipe, even if the inner diameter of the steel pipe is not a perfect circle, the thickness of the pipe is constant. The purpose is to enable cutting and finish to a good surface roughness.

  Therefore, as shown in FIGS. 8A and 8B, the present invention includes a rotary drive device 69 that holds one end of the tube A and rotates it around its axis, and a boring bar that can advance and retreat in the axial direction of the tube. 61 and a boring head 62 having a boring head 62 provided with a cutting blade 63 attached to the tip of the boring bar and insertable into the tube, the boring head 62 has its tip Mounting bush 67a having a spring provided radially inward from the peripheral surface on the side, holding body 66c supported by the spring, and fixed to the outer end of the holding body so as to be movable in and out and to the outside of the boring head. One movable shoe 66 biased toward the movable shoe, and one fixed shoe 6 projecting from the peripheral surface of the boring head provided in the vicinity of the cutting blade 63 at a position opposite to the movable shoe. When, it is provided with a and one fixed shoe 65 having the same height provided at an intermediate position between the movable shoe 66 in the direction of rotation of the rear side of the tube of the fixing shoe.

  The “long shaft inner surface processing apparatus” of Patent Document 2 aims to prevent idling due to sulfur slip without using sulfur anti-slip paint.

  Therefore, as shown in FIG. 9, the present invention includes a shaft rotating device 72 that rotates the long shaft 71 around the axis ZZ, and a tool that moves the processing tool 74 along the axis in the long shaft. And a moving device 76. The processing tool 74 includes a hollow tube 89 extending along the axis of the long shaft, an expansion / contraction rod 82 penetrating the inside thereof, a knurling support portion 84 having a knurling 83, a knurling support portion, and a tip of the hollow tube. It comprises a parallel link 85 that connects the parts, and an expansion / contraction link 86 that connects the knurling support part and the tip of the rod.

Japanese Examined Patent Publication No. 7-246, “Copying device for inner wall of pipe” Japanese Patent Application Laid-Open No. 10-202434, “Long shaft inner surface processing apparatus”

  FIG. 1 is a schematic view of a long shaft to which the present invention is applied. This long shaft 1 has already been balanced, and the inner surface 2 (preparation hole) is machined in a perfect circle and concentric with respect to the axis, and it is necessary to perform boring processing accurately following this pilot hole 2. . Patent Documents 1 and 2 have already been disclosed as such long shaft inner surface processing apparatuses.

When performing boring, an operation called “blade alignment” is performed in order to confirm the position at which the tip of the inner surface cutting tool just hits the inner surface of the long shaft. Neither of the processing apparatuses of Patent Document 1 and Patent Document 2 has a mechanism for blade alignment work, and in a conventional long shaft processing apparatus including these, the sound of the blade tip hitting the inner surface of the long shaft is operated. The staff heard and matched the blades. Alternatively, the inner surface of the long shaft is measured using an inner diameter measuring jig to determine the cut amount.
However, because there are individual differences in human hearing, the method of judging by listening to sound was not reproducible. Further, in the method using the inner diameter measuring jig, since a long jig capable of measuring the long shaft is necessary, the jig itself bends, so that it cannot be measured with high accuracy. For this reason, it has been difficult to accurately align the blades. In addition, it is difficult to accurately align the blade members other than the long shaft for the same reason.

The present invention has been developed to solve the above-described problems. That is, a first object of the present invention is to provide an inner surface machining apparatus capable of accurately performing blade alignment.
In addition, the second object of the present invention is to provide a long shaft having an inner diameter of about 100 mm, an intermediate portion of about 130 mm, and an overall length of about 3 m. The maximum diameter of the machining head to be inserted into the shaft can be made thinner than the pilot holes at both ends of the long shaft, preventing a drop in machining accuracy due to the tool reaction force during machining, and the inner surface of the long shaft can be accurately followed by the pilot hole Another object of the present invention is to provide an inner surface processing apparatus capable of inner surface processing.

(1) The present invention is an inner surface processing apparatus that cuts the inner surface of a tubular member having a pilot hole penetrating in the axial direction following the pilot hole, the fixing device fixing the tubular member, and the tubular member A machining head having an inner surface cutting tool which can be inserted in the pilot hole in the axial direction and movable in the radial direction, and an axial movement means for moving the machining head relative to the tubular member in the axial direction And a rotation means for rotating the cutter relative to the tubular member, and a contact detection sensor for detecting that the cutter has contacted the inner surface of the pilot hole. .

  According to the present invention described above, the contact detection sensor can detect that the cutter has contacted the inner surface of the pilot hole, so that the position (zero point position or reference position) where the cutter has just hit the inner surface of the pilot hole can be accurately determined. Thus, the blades can be accurately aligned.

(2) In the inner surface processing apparatus of (1), the tubular member is a long shaft, the fixing device fixes the long shaft so as not to bend, and the processing head includes the cutting tool. A cutter head that can rotate about an axis, and supports the cutter head rotatably, aligns the center of rotation of the cutter head with the axis of the pilot hole, and moves the cutter head in the axial direction within a long shaft. An inner surface copying head that is movably supported, and the shaft moving means is connected to the inner surface copying head from one end of the long shaft through a pilot hole, and is configured as a head moving device that moves the machining head in the axial direction. The rotating means is connected to the blade head from the other end of the long shaft through a pilot hole, and is configured as a blade rotating device that rotationally drives the blade head around an axis. It has been.

According to the above configuration, the axial movement and the rotational drive of the machining head are performed by the head moving device and the blade rotating device connected to the machining head through the pilot hole of the long shaft. It is not necessary to provide a mechanism that requires force. That is, the machining head only needs to have a function of supporting the cutter head moving in the radial direction and having the rotation center of the cutter head coincide with the axis of the pilot hole and movably supported in the axial direction. The maximum diameter can be made thinner than the pilot holes at both ends of the long shaft.
In addition, the inner surface scanning head supports the blade head rotatably, and the rotation center of the blade head coincides with the axis of the pilot hole and supports the blade head movably in the long shaft in the radial direction. The machining reaction force of the above is released to the workpiece, and the shaft (boring bar) connected to the head that follows the inner surface copying the reaction force in the rotational direction takes charge, so that a long and narrow diameter can be realized.
In other words, the inner surface scanning head aligns the axis of the blade head with the axis of the pilot hole and supports it so as to be movable in the axial direction, thereby further reducing the size of the machining head and increasing the tool reaction force during machining. Since it is received by the inner surface of the shank shaft, it is possible to prevent a reduction in machining accuracy due to a tool reaction force.
Accordingly, it is possible to prevent boring accuracy due to the tool reaction force at the time of machining and accurately boring the inner surface of the long shaft following the pilot hole.

(3) In the inner surface machining apparatus according to (2), the blade head includes a tool base that is attached to a tip and movable in a radial direction, and a tool base that is driven in the axial direction and moves in the radial direction. An axial movement member that moves in a direction, the blade rotation device includes a blade drive rod that moves the axial movement member in the axial direction, and the contact detection sensor includes the tool base, the shaft It is a pressure sensor or a strain gauge attached to the direction moving member or the blade driving rod.

  According to the above configuration, the pressure sensor or strain gauge detects the pressure fluctuation or strain fluctuation due to the impact when the cutter hits the inner surface of the pilot hole, thereby accurately detecting that the cutter has hit the inner surface of the pilot hole. Can be detected well.

(4) In the inner surface processing apparatus of (1) or (2), the contact detection sensor is a sound sensor or a vibration sensor attached to the processing head.

  According to said structure, it can detect accurately that the cutter contacted the inner surface of the pilot hole by detecting the sound or vibration when the cutter hits the inner surface of the pilot hole by the sound sensor or the vibration sensor.

  According to the inner surface machining apparatus of the present invention, blade alignment can be performed accurately. In addition, the maximum diameter of the machining head to be inserted into the long shaft can be made thinner than the pilot holes at both ends of the long shaft, preventing a reduction in machining accuracy due to tool reaction force during machining, and the inner surface of the long shaft The inner surface can be precisely machined following the pilot hole.

It is a schematic diagram of the long shaft which this invention makes object. 1 is an overall configuration diagram of an inner surface machining apparatus according to an embodiment of the present invention. It is an expanded sectional view of the processing head of FIG. It is a figure which shows another example of an arrangement configuration of the sensor for contact detection. It is a figure which shows another structural example of the sensor for contact detection. It is a figure explaining operation | movement of the inner surface processing apparatus by embodiment of this invention. It is explanatory drawing of the conventional process of a long shaft. 1 is a configuration diagram of a “copier cutting device for an inner wall of a pipe” of Patent Document 1. FIG. 1 is a configuration diagram of a “long shaft inner surface processing apparatus” of Patent Document 2. FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, the inner surface machining apparatus of the present invention is a tubular member having a pilot hole 2 that penetrates in the axial direction and is symmetric with respect to the axis, for example, the inner surface of an elongated long shaft 1 that follows the pilot hole 2. This is an internal surface processing device for internal surface processing.

  FIG. 2 is an overall configuration diagram of the inner surface machining apparatus according to the embodiment of the present invention. As shown in this figure, the inner surface machining apparatus in the present embodiment includes a fixing device 10, a machining head 20, a head moving device 30, and a blade rotating device 40.

  The fixing device 10 is a device for fixing the long shaft. In the present embodiment, the fixing device 10 includes a horizontally extending main frame 11, a pair of chuck devices 12, 13 that are provided so as to be movable along the upper surface of the main frame 11 and concentrically hold both ends of the long shaft 1. And a plurality of support fittings 14 arranged at intervals along the upper surface of the main frame 11 and supporting the long shaft 1. With the fixing device 10 configured in this manner, the long shaft 1 can be fixed so as not to bend.

The machining head 20 has a dimension that can be inserted in the axial direction from at least one of the pilot holes 2 of the long shaft 1, and has an inner surface machining blade 29 that is movable in the radial direction. In the present embodiment, the machining head 20 includes a blade head 22 and an inner surface copying head 21.
The blade head 22 has the blade 29 described above and is configured to be rotatable around an axis.
The inner surface copying head 21 supports the cutter head 22 so as to be rotatable, and supports the cutter head 22 so that the center of rotation of the cutter head 22 coincides with the axis of the pilot hole 2 and is movable in the axial direction within the long shaft 1. To do.
The detailed structure of the processing head 20 will be described later.

  The head moving device 30 includes a boring bar 32, a bar moving device 34, and a hydraulic pressure supply device 36. The head moving device 30 constitutes an “axis moving means for moving the machining head relative to the long shaft in the axial direction” in the present invention.

  The boring bar 32 is a hollow cylindrical elongated member, and one end (left end in the figure) is connected to the machining head 20 (inner surface copying head 21) and extends horizontally in the axial direction. The boring bar 32 has a hollow hole 32a (see FIG. 3) penetrating along the axis.

  The bar moving device 34 includes a moving member 34a that grips the rear end portion (right end portion in the drawing) of the boring bar 32 in a non-rotatable manner, a screw screw 34b that is screwed with the moving member 34a and moves it in the axial direction, A rotary drive device 34c (for example, a motor with a speed reducer) that rotationally drives the screw screw 34b about the axis, and the machining head 20 is moved in the axial direction via the screw screw 34b and the boring bar 32 by the rotary drive device 34c. It is supposed to let you.

  In addition, in the bar moving apparatus 34, you may employ | adopt the other structure which can move the boring bar 32 to an axial direction instead of the structure which has the moving member 34a, the screw screw 34b, and the rotational drive apparatus 34c. For example, a configuration in which a rack and pin-on mechanism, a belt mechanism or a chain mechanism is driven by a rotary motor to move the boring bar 32 in the axial direction, or a configuration in which the boring bar 32 is directly moved in the axial direction by a linear motor is adopted. May be.

  With the bar moving device 34 having the above-described configuration, one end (left end) of the boring bar 32 is connected to the machining head 20 from one end of the long shaft 1 through the pilot hole 2, and the machining head 20 is moved in the axial direction by moving the boring bar 32. Can be moved.

  The hydraulic pressure supply device 36 includes a hydraulic pressure unit 36a and a hydraulic hose 36b connected to the end (right end in the figure) of the boring bar 32, and the machining head 20 is passed through the hollow hole 32a (see FIG. 3) of the boring bar 32. A hydraulic working fluid (described later) for operating is supplied.

  The blade rotation device 40 includes a rotation rod 42, a blade drive rod 44, a rotation drive device 46, and an axis movement device 48. The blade rotating device 40 constitutes “a rotating means for rotating the blade relative to the long shaft” in the present invention.

The rotating rod 42 is a hollow cylindrical elongated member, and one end (right end in the drawing) is connected to the machining head 20 (the blade head 22) and extends horizontally in the axial direction.
The blade drive rod 44 extends in the axial direction through the hollow hole of the rotary rod 42 and is connected to an axially moving member 28 (see FIG. 3) of the machining head 20 described later so as not to be relatively rotatable.

  The rotation drive device 46 includes a horizontal movement table 46a provided so as to be horizontally movable along the upper surface of the main frame 11, and a rotation drive chuck 46b installed on the horizontal movement table 46a. The horizontal moving table 46a has a horizontal rail (not shown) and a guide guided by the horizontal rail, and moves horizontally with low resistance. The rotation drive chuck 46b includes a chuck device that grips the shaft end (left end in the drawing) of the rotation rod 42 and a chuck rotation drive mechanism that rotates the chuck device around the axis.

  With the configuration described above, the blade rotating device 40 drives the rotary rod 42 connected to the machining head 20 through the pilot hole 2 from the other end (the left end in the figure) of the long shaft 1 to rotate around the axis, and the machining head 20. The horizontal movement table 46a can be moved in the axial direction following this movement.

  The shaft moving device 48 is a linear motion actuator installed on the horizontal moving table 46 a, moves in the axial direction together with the rotation driving device 46, and moves the blade driving rod 44 relative to the rotating rod 42. It is like that. As the linear motion actuator constituting the shaft moving device 48, a combination of a rotary motor and a power conversion mechanism (rack and pinion mechanism, ball screw mechanism, belt mechanism, etc.), a linear motor, or a hydraulic cylinder device can be adopted. . The shaft moving device 48 supports the blade drive rod 44 so as to be rotatable. For this reason, the blade drive rod 44 can be rotated together with an axially moving member 28 described later.

FIG. 3 is an enlarged cross-sectional view of the machining head 20 of FIG.
In this example, the inner surface copying head 21 includes a cylindrical main body 23, a pair of inner surface chucks 24 provided at positions spaced in the axial direction of the main body 23, and an axial distance of the main body 23. And a pair of pistons 25 provided at the positions where
The cylindrical main body 23 has a diameter that can be inserted into the pilot hole 2 of the long shaft 1 in the axial direction.

  Each inner surface chuck 24 includes a rotating rotor 24a that can roll in the axial direction and a guide member 24c that is provided in the main body 23 so as to be movable in the radial direction and moves the rotating rotor 24a forward and backward in the radial direction. Has more than 3 sets in the direction. In the configuration example of FIG. 3, in each inner surface chuck 24, three sets of the rotary rotor 24a and the guide member 24c are arranged at intervals of 120 degrees. Each guide member 24c has a tapered surface 24b inclined with respect to the axis.

The pair of pistons 25 are provided in the main body 23 between the pair of inner surface chucks 24 so as to be movable in the direction opposite to the axial direction.
Each piston 25 has a tapered surface 25a having the same inclination as the tapered surface 24b of each guide member 24c at one axial end thereof. The tapered surfaces 24b and 25a may be flat.

  The main body 23 has a hydraulic flow path 23 a that supplies hydraulic hydraulic fluid between a pair of pistons 25 from a hollow hole 32 a formed in the boring bar 32.

  With the above-described configuration, the pair of inner surface chucks 24 is radially expanded by the hydraulic working fluid supplied from the hydraulic pressure supply device 36 to the inner surface copying head 21 so that the axis of the blade head 22 matches the axis of the pilot hole 2. The inner surface copying head 21 can be supported by the rotary rotor 24a so as to be movable in the axial direction.

  Further, even when the pilot hole 2 is a tapered hole, the pair of pistons 25 move independently, so the pair of inner surface chucks 24 are radially expanded independently of each other so that the axis of the blade head 20 is adjusted to the pilot hole. Can coincide with the two axes.

The blade head 22 includes a hollow cylindrical sub main body 26, a tool base 27 with a blade 29 attached to the tip, and an axial movement member 28 provided in the sub main body 26.
The sub main body 26 is connected to the inner surface copying head 21 via a bearing 26a so as to be rotatable about an axis.
The tool base 27 is guided so as to be movable in the radial direction within the sub-main body 26, and has inclined teeth 27a inclined with respect to the axis.

  The axial movement member 28 has inclined teeth 28 a that mesh with the inclined teeth 27 a of the tool base 27. Further, the axial direction moving member 28 is concentric with the blade driving rod 44 and connected to each other so as not to rotate relative to each other, moves in the axial direction together with the blade driving rod 44 and rotates around the axis.

  With the configuration described above, the blade head 22 can be supported by the inner surface copying head 21 so as to be rotatable about its axis. Further, by moving the blade drive head 44 in the axial direction by the axial movement device 48, the axial movement member 28 connected to the blade drive head 44 is moved in the axial direction, and this axial movement is performed by the inclined teeth 27a and the inclined teeth. The tool 29 can be moved in the radial direction by converting it into radial movement of the tool base 27 via 28a.

As shown in FIG. 3, the inner surface machining apparatus of the present invention further includes a contact detection sensor 15 for detecting that the cutter 29 has contacted the inner surface of the pilot hole 2.
In the configuration example of FIG. 3, the contact detection sensor 15 is a pressure sensor 15 </ b> A or a strain gauge 15 </ b> B that is attached to the tool base 27. In the illustrated example, both the pressure sensor 15A and the strain gauge 15B are shown, but a configuration having only one of them may be used.

  When the pressure sensor 15A is employed as the contact detection sensor 15 provided on the tool base 27, the tool base 27 is divided into a portion where the inclined teeth 27a are formed and a portion where the blade 29 is attached, and the pressure sensor 15A is interposed therebetween. By arranging, the pressure sensor 15 </ b> A can be provided on the tool base 27. As the pressure sensor, for example, a piezoelectric element (piezo element) or a load cell can be used.

  When the strain gauge 15B is employed as a contact detection sensor provided on the tool base 27, the strain gauge 15B is attached to a position where the strain in the moving direction of the tool base 27 (the radial direction of the blade head 22) can be measured. Can be provided on the tool base 27.

  With respect to a method of transmitting the detection signal from the pressure sensor 15A or the strain gauge 15B to the outside, for example, an axial hole is provided inside the axial movement member 28 and the blade drive rod 44, and the pressure sensor 15A or strain is provided in the hole. You may employ | adopt the structure of transmitting a signal through the signal cable connected with the gauge 15B. In the case of this configuration, since the axially moving member 28 and the blade driving rod 44 are both rotating members, it is necessary to provide an electrical connection means such as a slip ring in order to enable signal transmission between the stationary part. There is.

  According to the above configuration, when the blade 29 is moved toward the inner surface of the pilot hole 2, it can be detected by the contact detection sensor 15 that the blade 29 has contacted the inner surface of the pilot hole 2. The position (zero point position or reference position) at which 29 just hits the inner surface of the pilot hole can be accurately known, whereby the blade alignment can be performed accurately.

In the configuration example of FIG. 3, both the pressure sensor 15 </ b> A and the strain gauge 15 </ b> B may be provided, and two sensors may be used in combination to increase detection accuracy.
Further, when the linear actuator constituting the shaft moving device 48 is a hydraulic cylinder device, it may be detected that the blade 29 has come into contact with the inner surface of the pilot hole 2 by sensing the hydraulic pressure fluctuation of the hydraulic cylinder device. Such a configuration may be employed as a contact detection sensor in the present invention.

  FIG. 4 is a diagram showing another arrangement configuration example of the contact detection sensor 15. In the configuration example of FIG. 4, a pressure sensor 15 </ b> A as a contact detection sensor is disposed between the axial movement member 28 and the blade drive rod 44. In this configuration, when the blade 29 is moved toward the inner surface of the pilot hole 2 and the blade 29 comes into contact with the inner surface of the pilot hole 2, the impact caused by the contact is changed in pressure via the tool base 27 and the axial movement member 28. Is transmitted to the pressure sensor 15 </ b> A. Therefore, by detecting the pressure sensor 15 </ b> A, it is possible to detect that the blade 29 has contacted the inner surface of the pilot hole 2.

  Further, as shown in FIG. 4, a strain gauge 15 </ b> B as a contact detection sensor may be attached to the axial movement member 28. In the case of this configuration, an impact when the blade 29 comes into contact with the inner surface of the pilot hole 2 is transmitted to the strain gauge 15B as a strain variation via the tool base 27 and the axially moving member 28, and is detected by the strain gauge 15B. By doing so, it can be detected that the blade 28 has contacted the inner surface of the pilot hole 2. In the configuration example of FIG. 4, both the pressure sensor 15 </ b> A and the strain gauge 15 </ b> B may be provided, and the detection accuracy may be increased by using two sensors together.

  FIG. 5 is a diagram illustrating another configuration example of the contact detection sensor 15. In the configuration example of FIG. 5, the contact detection sensor 15 is a sound sensor 15 </ b> C or a vibration sensor 15 </ b> D attached to the machining head 20. In the illustrated example, both the sound sensor 15C and the vibration sensor 15D are shown, but a configuration having only one of them may be used.

  The sound sensor 15C (or the vibration sensor 15D) is preferably installed in the vicinity of the blade 29. Further, as shown in FIG. 5, the sound sensor 15C (or vibration sensor 15D) is preferably installed on the inner surface copying head 21, which is a non-rotating component. With such a configuration, the sound sensor 15C (or vibration sensor 15D) is provided. The signal cable can be easily wired.

  According to said structure, the blade 29 is moved toward the inner surface of the pilot hole 2, and the sound or vibration when the blade 29 hits the inner surface of the pilot hole is detected by the sound sensor 15C or the vibration sensor 15D. Therefore, it is possible to accurately know the position (the zero point position or the reference position) where the blade 29 just hits the inner surface of the pilot hole, and thereby the blade alignment can be performed accurately.

  In the configuration example of FIG. 5, both the sound sensor 15 </ b> C and the vibration sensor 15 </ b> D may be provided, and the detection accuracy may be increased by using two sensors together.

Next, the operation of the inner surface machining apparatus of the present invention will be described with reference to FIG.
6A shows an inner surface processed state of the long shaft 1 of FIG. 1 on the left end side (counter flange side) and FIG. 6B shows a right end side (flange side). The contact detection sensor in the inner surface processing apparatus shown in FIG. 6 is the pressure sensor 15A provided on the tool base 27, but the operation described below is the contact detection sensor of the other configuration shown in FIGS. The same applies when (15A to 15D) is used.

6A, the machining head 20 is inserted into the pilot hole 2a having the minimum diameter on the left end side (counter flange side) of the long shaft 1 shown in FIG.
Next, a liquid (working fluid) for applying a hydraulic pressure is supplied between the pair of pistons 25 through the hollow holes 32a of the boring bar 32, and the pair of pistons 25 are moved away from each other. The pair of inner surface chucks 24 are radially expanded. By expanding the diameter of the inner surface chuck 24, the axis (rotation center) of the cutter head 22 is made to coincide with the axis of the pilot hole 2, and the inner surface scanning head 21 and the cutter head 22 are moved in the axial direction in the pilot hole 2 by the inner chuck 24. Support as possible.

  When the axis of the cutter head 22 is aligned with the axis of the pilot hole 2, the cutter drive rod 44 is driven in the axial direction to move the cutter 29 radially outward via the axially moving member 28 and the tool base 27. Based on the detection from the contact detection sensor 15, an operation (blade alignment) is performed in which a position where the blade 29 just contacts the inner surface of the pilot hole 2 is set as a reference position (zero point position). When the reference position is known, the cutter 29 is further moved from the reference position toward the inner surface of the pilot hole by a predetermined cut amount.

Next, the blade head 22 is rotated around the axis line from the outside of the long shaft 1 by the rotating rod 42, and the inner surface copying head 21 is pivoted from the outside of the long shaft 1 via the boring bar 32 by the bar moving device 34. By moving in the direction, the inner surface of the long shaft 1 is processed along the pilot hole 2.
By the processing procedure described above, the inner surface can be processed using the apparatus of the present invention up to the vicinity of the pilot hole 2a having the minimum diameter in the long shaft 1.

Next, in FIG. 6B, the axial direction of the long shaft 1 is reversed, and the machining head is directed with the sub main body 22 side toward the prepared hole on the right end side (flange side) of the long shaft 1 in FIG. 20 is inserted and the inner surface is similarly processed. Thus, the inner surface is processed using the apparatus of the present invention up to the vicinity of the flange of the long shaft 1.
Thus, by reversing the axial direction of the long shaft 1 with respect to the machining head 20 and machining the inner surface following the pilot hole 2, the unworkable range can be minimized.

  Note that both end portions of the machining head 20 can be easily attached to and detached from the boring bar 32, the rotating rod 42 and the blade driving rod 44 with bolts or the like so that the axial direction of the long shaft 1 can be easily reversed. .

According to the inner surface machining apparatus having the above-described configuration, the driving force necessary for the axial movement and rotational driving of the machining head 20 is supplied from the two shafts (boring bar 32 and rotating rod 42) arranged on both sides in the axial direction. As a result, the processing head 20 can be reduced in size and diameter.
That is, the head moving device 30 and the blade rotating device 40 connected to the processing head 20 through the pilot hole 2 of the long shaft 1 perform axial movement and rotational driving of the processing head 20 having the inner surface processing blade 29. With this configuration, the machining head 20 has the function of supporting the blade 2 that moves in the radial direction and that the rotation center of the blade head 22 coincides with the axis of the pilot hole 2 and is movable in the axial direction. As a configuration of the machining head 20, it is not necessary to provide a mechanism requiring a large driving force, so that the maximum diameter of the machining head 20 can be made thinner than at least one pilot hole 2 at both ends of the long shaft 1. .

Further, the machining head 20 is provided with an inner surface chuck 24 to release the machining reaction force in the radial direction to the workpiece (long shaft 1), and the shaft (boring bar 32) takes over the machining reaction force in the rotation direction to reduce the diameter. Can be realized.
That is, the inner surface chuck 20 is radially expanded by the hydraulic hydraulic fluid supplied from the head moving device 30 so that the axis of the cutter head 22 coincides with the axis of the pilot hole 2 and the cutter head 22 can be moved in the axial direction. By supporting, the size of the machining head 20 can be further reduced, and the tool reaction force at the time of machining is received by the inner surface of the pilot hole 2 of the long shaft 1, thereby preventing a reduction in machining accuracy due to the tool reaction force. Can do.

Further, since the machining head 20 includes the pair of inner surface chucks 24, the coaxiality of the machining head 20 with respect to the pilot hole 2 can be accurately ensured, and the coaxiality can be ensured even with a tapered pilot hole.
That is, the inner surface copying head 21 has a pair of inner surface chucks 24 that are spaced apart in the axial direction, and is independently operated by a pair of pistons 25, so that the pilot hole 2 is cylindrical or tapered. Even if it exists, the process head 20 can always be concentrically hold | maintained with respect to a pilot hole.

Furthermore, the axial movement member 28 is moved in the axial direction by the axial movement device 48 of the blade rotating device 40, and the blade 29 is moved in the radial direction by the axial movement of the axial movement member 28. Miniaturization is further facilitated.
Therefore, it is possible to prevent the machining accuracy from being lowered due to the tool reaction force during machining, and to accurately boring the inner surface of the long shaft 1 following the pilot hole 2.

  Further, since the contact detection sensor 15 can detect that the blade 29 has come into contact with the inner surface of the pilot hole 2, the position (the zero point position or the reference position) where the blade 29 just hits the inner surface of the pilot hole 2 can be accurately determined. This makes it possible to accurately align the blades.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention. For example, the structure which added the following changes is also contained in the scope of the present invention.

  In the above-described embodiment, as a configuration example of the processing head 20, a configuration is shown in which the inner chuck 24 is expanded in diameter by hydraulic pressure so that the shaft center coincides with the center of the pilot hole 2 and can be moved in the axial direction. However, the present invention is not limited to this, and other known processing head configurations may be employed.

  In the above-described embodiment, as a configuration example of the “axis moving means for moving the machining head relative to the long shaft in the axial direction” in the present invention, the machining head is pivoted while the position of the long shaft is fixed. Although the head moving device 30 that moves in the direction is shown, the axis moving means may be configured to move the long shaft in the axial direction while fixing the position of the processing head.

  In the embodiment described above, the blade rotating device 40 that rotates the blade while the long shaft is fixed is shown as a configuration example of the “rotating unit that rotates the blade relative to the long shaft” in the present invention. However, the rotating means may be configured to rotate the long shaft around the axis while the position of the blade is fixed.

1 Long shaft (tubular member)
2 Pilot hole 2a Pilot hole 10 of minimum diameter Fixing device 11 Main frame 12, 13 Chuck device 14 Support metal fitting 15 Contact detection sensor 15A Pressure sensor 15B Strain gauge 15C Sound sensor 15D Vibration sensor 20 Processing head 21 Inner surface copying head 22 Blade head 23 Main body 23a Hydraulic flow path 24 Inner surface chuck 24a Rotating rotor 24b Tapered surface 24c Guide member 25 Piston 25a Tapered surface 26 Sub-main body 27 Tool base 27a Inclined tooth 28 Axial moving member 28 Inclined tooth 29 Cutting tool 30 for inner surface processing Head movement Device 32 Boring bar 34 Bar moving device 34a Moving member 34b Screw screw 34c Rotation drive device 36 Fluid pressure supply device 36a Fluid pressure unit 36b Fluid pressure hose 40 Blade rotation device 42 Rotation rod 44 Blade drive rod 46 Rotation drive device 46 Horizontal moving table 46b rotary drive chuck 48 axial movement device

Claims (4)

An inner surface machining apparatus that cuts the inner surface of a tubular member having a pilot hole penetrating in the axial direction following the pilot hole,
A fixing device for fixing the tubular member;
A machining head having an inner surface cutting tool that is axially insertable into the pilot hole of the tubular member and is movable in a radial direction;
Axial movement means for moving the processing head relative to the tubular member in the axial direction;
Rotating means for rotating the blade relative to the tubular member;
An inner surface processing apparatus comprising: a contact detection sensor for detecting that the cutter has contacted the inner surface of the pilot hole. The tubular member is a long shaft,
The fixing device fixes the long shaft so as not to bend,
The machining head includes a cutter head having the cutter and rotatable about an axis, and rotatably supporting the cutter head, the rotation center of the cutter head being aligned with the axis of the pilot hole, and within the long shaft. An inner surface copying head that supports the blade head movably in the axial direction;
The axis moving means is connected to the inner surface copying head through a pilot hole from one end of the long shaft, and is configured as a head moving device that moves the machining head in the axial direction.
The inner surface machining apparatus according to claim 1, wherein the rotating unit is configured as a blade rotating device that is connected to the blade head through a pilot hole from the other end of the long shaft and rotates the blade head around an axis. . The blade head includes a tool base that is attached to a tip and movable in the radial direction, and an axial movement member that is driven in the axial direction and moves the tool base in the radial direction by axial movement.
The blade rotating device has a blade driving rod for moving the axial movement member in the axial direction,
The inner surface processing apparatus according to claim 2, wherein the contact detection sensor is a pressure sensor or a strain gauge attached to the tool base, the axial movement member, or the blade driving rod.   The inner surface processing apparatus according to claim 1, wherein the contact detection sensor is a sound sensor or a vibration sensor attached to the processing head.

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