JP2010197213A - Device for cutting and inspecting round bar material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device 2 for cutting and inspecting a round steel bar 32 easily and accurately. <P>SOLUTION: This device 2 includes a frame 4, a first rail 6, a second rail 8, a driving part 10, a driven part 12, a cutting machine 14, a ball screw 16, a nut 18, a detector 20 and a measuring machine 22. The round steel bar 32 is rotated by the driving part 10 and the driven part 12. The cutting machine 14 can be moved along the first rail 6. The cutting machine 14 includes a cutting tool 54. The surface of the round steel bar 32 is cut by the cutting tool 54. The detector 20 can be moved by the ball screw 16 and the nut 18. A surface flaw of the round steel bar 32 is detected by the detector 20. A measuring machine 64 can be moved along the second rail 8. The measuring machine 22 includes a light projecting/receiving part 64. A laser beam is emitted from the light projecting/receiving part 64 toward the round steel bar 32. The size of the round steel bar 32 is measured by the laser beam. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for performing surface cutting of a round bar and quality inspection of the round bar.

  In the manufacture of large-diameter round bar steel, a plastic ingot such as forging or rolling is applied to the ingot obtained through processes such as refining and ingot forming. This plastic working is performed hot. A decarburized layer is formed on the surface of the obtained round steel bar due to the influence of heat during plastic working. Further, the surface of the round bar steel has wrinkles derived from the steel ingot and wrinkles generated by plastic working.

  The decarburized layer and surface flaws can be removed by cutting the surface of the round steel bar. Turning is used for the removal. In turning, a cutting tool is pressed against the surface of a round steel bar. The cutting tool moves in the longitudinal direction of the round steel bar. On the other hand, the round bar is rotated. This movement and rotation cuts the entire surface of the round steel bar.

  After turning, the quality of the round bar is inspected. Examples of inspection items include the presence or absence of surface defects, the presence or absence of internal defects, and dimensions. For inspection of surface defects, the leakage magnetic flux inspection method is suitable. On the other hand, ultrasonic flaw detection is suitable for the inspection of internal flaws. An example of the leakage magnetic flux flaw detection method is disclosed in JP-A-2002-250717. An example of the ultrasonic flaw detection method is disclosed in Japanese Patent Application Laid-Open No. 2007-309664.

JP 2002-250717 A JP 2007-309664 A

  In the leakage magnetic flux flaw detection method, the probe rotates relative to the round bar steel. In general, the probe rotates relative to a fixed round steel bar. When the leakage magnetic flux flaw detection method is applied to inspection of a large-diameter round bar steel, it is necessary to set the rotation radius of the probe large, and a large-scale device is required. Under such circumstances, the surface flaw inspection of large-diameter round steel bars is actually conducted visually. If the probe is fixed and the round steel bar rotates, a large-scale device is not necessary. However, in this case, a device for rotating the round bar steel is necessary, and the setting of the round bar steel to this device is necessary.

  In ultrasonic flaw detection, the probe rotates relative to the round steel bar. In general, the probe rotates relative to a fixed round steel bar. When ultrasonic flaw detection is applied to the inspection of a large-diameter round bar steel, the radius of rotation of the probe needs to be set large, and a large-scale device is required. For this reason, a handy type probe is used for the internal flaw inspection of large-diameter round steel bars. If the probe is fixed and the round steel bar rotates, a large-scale device is not necessary. However, in this case, a device for rotating the round bar steel is necessary, and the setting of the round bar steel to this device is necessary.

  An object of the present invention is to provide an apparatus that can easily and accurately cut and inspect a round bar.

The device according to the present invention comprises:
(1) A rotating machine for gripping a round bar and rotating the round bar in the circumferential direction;
(2) A cutting machine that has a cutting tool that contacts the round bar, and that moves relative to the round bar in the longitudinal direction of the round bar to cut the surface of the round bar, and (3 ) A detector that detects wrinkles of the round bar by moving relative to the round bar in the longitudinal direction of the round bar is provided. This apparatus cuts and inspects the round bar.

  A preferred detector is a probe for leakage flux testing, a probe for ultrasonic testing, or a probe for eddy current testing.

Preferably, the device is
(4) It further includes a measuring machine that measures the dimensions of the round bar by moving relative to the round bar in the longitudinal direction of the round bar.

The method for producing a round bar according to the present invention is as follows.
(A) A rotary machine grips a round bar and rotates the round bar in the circumferential direction by the rotary machine, while moving the cutting machine having a cutting tool relative to the round bar in the longitudinal direction of the round bar. A step of cutting the surface of the round bar, and (b) the round bar is rotated in the circumferential direction by the rotary machine while the round bar is held by the rotary machine, and the detector is rounded. The method includes a step of detecting the wrinkles of the round bar by moving the bar relative to the longitudinal direction of the round bar.

Preferably, the manufacturing method comprises:
(C) While rotating the round bar in the circumferential direction with this rotary machine while holding the round bar with the rotary machine, the measuring machine is moved relative to the round bar in the longitudinal direction of the round bar. And a step of measuring the dimensions of the round bar.

  With the apparatus according to the present invention, the quality of a round bar can be inspected easily and accurately.

FIG. 1 is a front view showing an apparatus according to an embodiment of the present invention together with a round steel bar. FIG. 2 is a plan view showing the apparatus of FIG. 1 together with a round steel bar. FIG. 3 is a side view showing the measuring machine of the apparatus of FIG. 1 together with a round steel bar. FIG. 4 is a flow diagram illustrating a method for manufacturing a round bar steel using the apparatus of FIGS. 1 to 3.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  The apparatus 2 shown in FIGS. 1 and 2 includes a frame 4, a first rail 6, a second rail 8, a drive unit 10, a driven unit 12, a cutting machine 14, a ball screw 16, a nut 18, a detector 20 and a measuring machine 22. It has.

  The frame 4 includes a base 24, a first support 26, a second support 28, and a third support 30. The first column 26 and the third column 30 stand from the base 24, respectively. The first support column 26, the second support column 28, and the third support column 30 are each firmly fixed to the base 24. The second support column 28 is attached to the base 24 so that it can move in the longitudinal direction of the round bar 32 depending on the length of the round bar 32. The first support column 26 is located at the left end of the base 24. The third support column 30 is located at the right end of the base 24. The second column 28 is located between the first column 26 and the third column 30 and close to the third column 30.

  The first rail 6 and the second rail 8 are placed on the base 24. The first rail 6 and the second rail 8 are fixed to the base 24. The first rail 6 and the second rail 8 extend in a direction parallel to the round steel bar 32.

  The drive unit 10 is attached to the first support column 26 via a bearing 34. The drive unit 10 includes a chuck 36 and a shaft 38. The chuck 36 is fixed to the shaft 38. The left end 40 of the round bar 32 is gripped by the chuck 36. The shaft 38 is connected to a motor (not shown).

  The driven portion 12 is attached to the second support column 28 via a bearing 42. The follower 12 includes a needle 44 and a shaft 46. The needle 44 is fixed to the shaft 46. The tip of the needle 44 is inserted into the right end 48 of the round steel bar 32. The tip position of the needle 44 coincides with the center of the round steel bar 32. The shaft 46 is rotatable with respect to the second support column 28.

  The drive unit 10 and the driven unit 12 constitute a rotating machine 50. As the motor described above rotates, the drive unit 10 rotates. The round steel bar 32 is rotated in the circumferential direction by the rotation of the drive unit 10. The follower 12 rotates following the round steel bar 32.

  The cutting machine 14 includes a main body 52 and a cutting tool 54 (cutting tool). The main body 52 is attached to the first rail 6. The main body 52 can slide with respect to the first rail 6. The main body 52 can move while being guided by the first rail 6. The movement is achieved by driving means (not shown). This movement is made in a direction parallel to the round bar 32. In other words, the cutting machine 14 can move in the longitudinal direction of the round bar 32. As shown by a two-dot chain line in FIG. 2, the cutting machine 14 can move from the left end 40 to the right end 48 of the round steel bar 32. The cutting tool 54 is attached to the main body 52. As apparent from FIG. 2, the cutting tool 54 is in contact with the outer peripheral surface of the round steel bar 32.

  The left end of the ball screw 16 is attached to the first support column 26 via a bearing 56. The right end of the ball screw 16 is attached to the third support column 30 via a bearing 58. A spiral groove 60 is carved on the surface of the ball screw 16.

  The nut 18 encloses the ball screw 16. The inner peripheral surface of the nut 18 is engaged with the ball screw 16. The ball screw 16 and the nut 18 constitute a ball screw-nut mechanism. When a motor (not shown) rotates, the ball screw 16 rotates. By the normal rotation of the ball screw 16, the nut 18 moves in a direction from the left end 40 to the right end 48 of the round steel bar 32. Due to the reverse rotation of the ball screw 16, the nut 18 moves in the direction from the right end 48 to the left end 40 of the round steel bar 32. As shown by a two-dot chain line in FIG. 2, the nut 18 can move from the left end 40 to the right end 48 of the round steel bar 32.

  The detector 20 is fixed to the lower surface of the nut 18. The detector 20 is located directly above the round bar 32. The detector 20 is separated from the round bar 32. As the nut 18 moves, the detector 20 also moves. The direction of movement is the longitudinal direction of the round steel bar 32. The detector 20 can move from the left end 40 to the right end 48 of the round bar 32. In this embodiment, the detector 20 is a probe for leakage magnetic flux testing. The detector 20 can detect a magnetic flux leaking from the round steel bar 32.

  The measuring machine 22 includes a main body 62 and a light projecting / receiving unit 64. The main body 62 is attached to the second rail 8. The main body 62 can slide with respect to the second rail 8. The main body 62 can move while being guided by the second rail 8. The movement is achieved by driving means (not shown). This movement is made in a direction parallel to the round bar 32. In other words, the measuring machine 22 can move in the longitudinal direction of the round steel bar 32. As shown by a two-dot chain line in FIG. 2, the measuring device 22 can move from the left end 40 to the right end 48 of the round steel bar 32.

  FIG. 3 is a side view showing the measuring instrument 22 of the apparatus 2 of FIG. As shown in FIG. 3, a laser beam 66 is projected from the light projecting / receiving unit 64 toward the round steel bar 32. The beam 66 is reflected by the round bar 32 and received by the light projecting / receiving unit 64. The distance L1 can be measured based on the time lag between light projection and light reception. Since the distance L2 is known in advance, the radius R of the round steel bar 32 can be calculated by subtracting the distance L1 from the distance L2.

  FIG. 4 is a flowchart showing a method of manufacturing the round bar 32 using the apparatus 2 of FIGS. 1 to 3. In this manufacturing method, a base material is prepared (STEP 1). This base material is obtained through hot rolling or hot forging, heat treatment, and correction using a press or roll. In this specification, this base material itself is also referred to as “round steel bar”. In the initial state of the apparatus 2, the cutting machine 14, the detector 20, and the measuring machine 22 are each positioned in the vicinity of the left end 40.

  The round bar 32 is attached to the rotating machine 50 (STEP 2). Specifically, the left end 40 of the round bar 32 is gripped by the chuck 36 while the tip of the needle 44 is inserted into the center of the right end 48 of the round bar 32. The round steel bar 32 is rotated by the rotation of the motor (STEP 3).

  The surface of the round bar 32 is cut by the cutting machine 14 (STEP 4). Specifically, the cutting machine 14 moves toward the right end 48 while the cutting tool 54 is pressed against the surface of the round steel bar 32. By the rotation of the round bar steel 32 and the movement of the cutting machine 14, cutting is performed on almost the entire surface of the round bar steel 32. The decarburized layer is removed by cutting. Surface flaws are also removed by cutting. After cutting, the cutting machine 14 is located in the vicinity of the right end 48.

  After cutting, the rotation of the round bar 32 is stopped (STEP 5). Then, chips on the surface of the round steel bar 32 are removed (STEP 6). The round steel bar 32 is rotated again without being removed from the rotating machine 50 (STEP 7). The round bar steel 32 is inspected for surface defects by a leakage magnetic flux inspection method (STEP 8). Specifically, the round bar 32 is excited. By excitation, magnetic flux leaks into the space in the vicinity of the surface defect. On the other hand, the ball screw 16 is rotated by the rotation of the motor, and the detector 20 moves toward the right end 48. The magnetic flux leaking into the space is detected by the detector 20. By the rotation of the round bar 32 and the movement of the detector 20, an inspection is performed over almost the entire round bar 32. After the inspection, the detector 20 is located in the vicinity of the right end 48.

  The dimensions of the round bar steel 32 are measured (STEP 9). Specifically, the measuring instrument 22 moves toward the right end 48. As described above, the radius of the round bar 32 is measured by projecting and receiving the beam 66 by the projecting / receiving unit 64. The measurement is performed over almost the entire round bar 32 by the rotation of the round bar 32 and the movement of the measuring machine 22. After the measurement, the measuring instrument 22 is located in the vicinity of the right end 48. The surface defect inspection (STEP 8) and the dimension measurement (STEP 9) may be performed simultaneously.

  The rotation of the round bar 32 is stopped (STEP 10), and the round bar 32 is removed from the rotating machine 50 (STEP 11). If necessary, the round steel bar 32 is repaired and shipped. The round steel bar 32 may be repaired with the round steel bar 32 attached to the rotating machine 50. The round bar 32 having a surface flaw that cannot be repaired is used as scrap. Round steel bar 32, whose dimensional accuracy is significantly inferior, is also used as scrap.

  In the leakage magnetic flux flaw detection method, the round bar steel 32 and the detector 20 need to rotate relatively. In the apparatus 2 shown in FIGS. 1 to 3, the round bar 32 rotates and the detector 20 does not rotate. Therefore, a large-scale device for rotating the detector 20 is not necessary. By this apparatus 2, even if it is a large diameter round steel bar 32, the surface flaw can be inspected easily and in a small space. The accuracy of this inspection is high. This apparatus 2 is particularly suitable for a round steel bar 32 having an outer diameter of 200 mm or more and 600 mm or less.

  In this manufacturing method, the rotating machine 50 for cutting (STEP 4) is also used for surface flaw inspection (STEP 8). The rotating machine 50 is further used for dimension measurement (STEP 9). Therefore, it is not necessary to prepare a large number of rotating machines 50.

  In this manufacturing method, after the cutting (STEP 4), the round bar steel 32 is subjected to surface defect inspection (STEP 8) and dimension measurement (STEP 9) without removing the round bar steel 32 from the rotating machine 50. Accordingly, the round bar steel 32 is attached to the rotating machine 50 only once, and the round bar steel 32 is detached from the rotating machine 50 only once.

  A probe for ultrasonic flaw detection may be used as the detector 20. In the ultrasonic flaw detection method, ultrasonic waves emitted from the probe enter the round bar steel 32. When the round bar 32 has an internal flaw, the incident wave is reflected by the inner flaw. When the reflected wave is sensed by the probe, an internal defect is detected. Due to the rotation of the round bar 32 and the movement of the detector 20, the entire round bar 32 is inspected. A eddy current probe may be used as the detector 20. The apparatus 2 may include two or more types of probes.

  The apparatus described above can be used for cutting and inspection of round bars made of various materials.

DESCRIPTION OF SYMBOLS 2 ... Apparatus 4 ... Frame 6 ... 1st rail 8 ... 2nd rail 10 ... Drive part 12 ... Follower part 14 ... Cutting machine 16 ... Ball screw 18 ...・ Nut 20 ... Detector 22 ... Measuring instrument 24 ... Base 26 ... First strut 28 ... Second strut 30 ... Third strut 32 ... Round steel bar 36 ... Chuck 44 ... Needle 50 ... Rotating machine 54 ... Bit 60 ... Groove 64 ... Projecting / receiving unit 66 ... Laser beam

Claims (5)

A rotating machine for gripping a round bar and rotating the round bar in the circumferential direction,
There is a cutting tool that contacts the round bar, and a cutting machine that cuts the surface of the round bar by moving relative to the round bar in the longitudinal direction of the round bar, and the round bar An apparatus for cutting and inspecting a round bar with a detector that detects wrinkles of the round bar by moving relative to the longitudinal direction of the round bar.   The apparatus according to claim 1, wherein the detector is a probe for leakage magnetic flux testing, a probe for ultrasonic testing, or a probe for eddy current testing.   The apparatus according to claim 1, further comprising a measuring machine that measures the dimensions of the round bar by moving relative to the round bar in the longitudinal direction of the round bar. While rotating the round bar in the circumferential direction by this rotary machine gripping the round bar, the cutting machine having the cutting tool is relatively moved in the longitudinal direction of the round bar with respect to the round bar, The step of cutting the surface of the round bar and the round bar with the rotary machine while rotating the round bar in the circumferential direction while holding the round bar with the rotary machine. The manufacturing method of a round bar material including the process of making it relatively move to the longitudinal direction of this, and detecting the wrinkle of this round bar material. While rotating the round bar in the circumferential direction with this rotary machine while holding the round bar with the rotary machine, the measuring machine is moved relative to the round bar in the longitudinal direction of the round bar. The manufacturing method of Claim 4 which further includes the process of measuring the dimension of a bar.

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