JP2007256087A - Inspection equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid dispersion of an insertion position of a screw gage when inspecting a work, and to improve inspection accuracy or work efficiency. <P>SOLUTION: A tool 20 is provided on an upper plate 16 supported by a pole 14, and a work 50 having a female screw part 52 is hold so as not to be rotated on a holding part 18. A sleeve member 24 connected to a moving plate 24 is provided slidably on the pole 14, and a holder member 32 is supported rotatably over the moving plate 24 by a motor 28. A screw gage 36 having a male screw part 38 is supported on the holder member 32. When the screw gage 36 is rotated with a specified torque by the motor 28, the screw part 38 of the screw gage 36 is screwed into the screw part 52 of the work 50. When a torque greater than a prescribed value is applied, rotation of the screw gage 36 is stopped, and the stroke length in the axial direction of the screw gage 36 is measured by an encoder 42. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inspection device that inspects a screw portion of a workpiece, and more particularly to an inspection device that inspects a screw portion by rotating a screw gauge and screwing it into the screw portion of the workpiece.

  Conventionally, a pipe joint that joins a body and a nose by screwing a male screw formed on a nose into a female screw formed on the body has been widely used (see, for example, Patent Document 1). ). In this pipe joint, it is necessary to inspect screw parts of a workpiece such as a body and a nose at the time of manufacture to determine whether a predetermined standard is satisfied.

  Conventionally, when inspecting the screw part of the workpiece to be inspected, the inspector screwed the screw gauge into the screw part of the work by hand and visually confirmed the insertion position of the screw gauge into the workpiece, thereby confirming the pass / fail of the work. Judgment.

However, the method of screwing the screw gauge into the work manually by the inspector is time consuming and poor in workability. In addition, when screwed in manually, the rotational torque of the screw gauge varies, and the accuracy and reliability of the insertion position of the screw gauge decreases. Further, since the insertion position of the screw gauge is confirmed visually, there is a problem that the inspection accuracy becomes unstable.
Japanese Utility Model Publication No. 5-40803

  In view of such facts, an object of the present invention is to provide an inspection device capable of improving workability and inspection accuracy when inspecting a threaded portion of a workpiece.

  The invention according to claim 1 is an inspection device for inspecting a screw portion of a workpiece, the workpiece receiving jig holding the workpiece so as not to rotate, and the screw of the workpiece held by the workpiece receiving jig. A screw gauge that is screwed into a portion, a holder member that is provided so as to be movable in the axial direction of the workpiece receiving jig, and that is provided on the holder member, the holder member being rotated at a predetermined torque, It has a torque control type motor that stops rotating when a torque larger than the value is applied, and an encoder that measures the stroke length of the screw gauge in the axial direction.

  In the first aspect of the present invention, the work holding jig is held so that the work does not rotate, and the holder member that supports the screw gauge is rotated with a predetermined torque by the torque control type motor. When the screw gauge rotates and bites into the screw portion of the workpiece, the screw gauge moves along with the rotation in the axial direction of the workpiece receiving jig and is screwed into the back side of the screw portion. At that time, when a torque larger than a predetermined value is applied to the holder member, the rotation of the holder member is stopped by the torque control type motor, and the stroke length of the moved screw gauge in the axial direction is measured by the encoder. Based on this measurement value, it is possible to determine whether or not the screw portion of the workpiece is acceptable. As a result, workability is improved and the screw gauge is rotated with a specified torque, so that the repeatability of the insertion position of the screw gauge into the threaded portion of the workpiece is improved. Moreover, since the stroke length of the screw gauge is numerically managed, the inspection accuracy is improved.

  According to a second aspect of the present invention, in the inspection device according to the first aspect of the present invention, the inspection device includes a determination unit that determines whether or not the screw portion of the workpiece is inspected based on the stroke length measured by the encoder. Yes.

  In the second aspect of the present invention, the determination means determines whether or not the inspection of the thread portion of the workpiece is acceptable based on the stroke length measured by the encoder. As a result, there is no variation in inspection compared to the case of visual determination as in the prior art, and inspection accuracy is improved.

  According to a third aspect of the present invention, in the inspection device according to the second aspect, after the determination by the determination means, the torque control type motor reversely rotates the holder member with a torque larger than the prescribed torque. It is characterized by returning to the origin.

  In the third aspect of the invention, after the determination by the determination means, the torque control type motor reversely rotates the holder member with a torque larger than the prescribed torque to return to the origin. Detachment is performed automatically and workability is further improved.

  According to a fourth aspect of the present invention, in the inspection device according to any one of the first to third aspects, the screw gauge is supported by the holder member in a replaceable manner.

  In the invention according to claim 4, since the screw gauge is supported by the holder member in an exchangeable manner, the screw gauge can be exchanged according to the type of the work being the inspection product, and the cost can be reduced.

  The inspection device according to the present invention rotates the screw gauge with a specified torque and screws it into the threaded portion of the workpiece, so that the workability is improved and the repeatability of the insertion position of the screw gauge is improved. In addition, the stroke length of the screw gauge can be numerically managed, and the inspection accuracy is good.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an inspection apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an inspection device 10 according to the first embodiment of the present invention.

  In this inspection apparatus 10, a lower plate 12 is supported on a base 11, and a plurality of (for example, four) cylindrical guide members 14 are erected on the lower plate 12. An annular upper plate 16 is fixedly supported on the upper portion of the guide member 14. The upper plate 16 is provided with a circular opening 16A, and the jig 20 is detachably provided on the upper plate 16 by inserting the fitting portion 20A of the jig 20 from above the opening 16A. ing.

  A holding portion 18 having a circular opening is provided at the center of the jig 20, and a protruding portion 18 </ b> A having a reduced diameter on the inner diameter side is formed below the holding portion 18. When the workpiece 50, which is an inspection product, is inserted into the holding portion 18, the bottom surface of the workpiece 50 abuts against the protruding portion 18A, the outer peripheral surface of the workpiece 50 is guided by the wall portion of the holding portion 18, and the workpiece 50 stands upright. Held. The inner wall of the holding portion 18 is provided with a detent (not shown) protruding in the inner diameter direction, and this detent is engaged with an engaging portion (not shown) formed on the outer periphery of the workpiece 50. The workpiece 50 is held by the holding unit 18 so as not to rotate.

  The work 50 is formed of an annular member, and a female screw portion 52 is formed on the inner wall of the tip portion. Further, the holding part 18 is not provided with a fixing member for pressing the work 50, and the work 50 is held by the holding part 18 by its own weight. The material of the workpiece 50 is, for example, brass, and the screw portion 52 is prevented from being damaged by holding the workpiece 50 with its own weight.

  Further, the inspection apparatus 10 is provided with a unit 22 that can move in the vertical direction along the guide member 14. The unit 22 is provided with a sleeve member 24 that is externally inserted into the guide member 14 and slides in the vertical direction. The sleeve members 24 are connected by a moving plate 26. A motor 28 that rotates the holder member 32 is provided below the moving plate 26, and a cylinder 30 that rotatably supports the holder member 32 is provided above the moving plate 26. A support shaft 29 having an enlarged diameter is connected to the upper portion of the rotation shaft 28 </ b> A, and the support shaft 29 is rotatably supported via a bearing 31 disposed inside the cylindrical body 30. A holder member 32 is connected to the upper portion of the support shaft 29. The motor 28 uses a torque control type servo motor that rotates the holder member 32 with a prescribed torque and stops the rotation when a torque of a predetermined value or more is applied to the holder member 32.

  A concave portion 32A is provided on the upper portion of the holder member 32, and a substantially hexagonal attachment portion 38 is inserted into the concave portion 32A. A support shaft 39 of a screw gauge 36 is attached to the upper portion of the attachment portion 38. A screw hole into which the screw portion 34A of the tightening member 34 is screwed is formed in the concave portion 32A. By tightening the tightening member 34, the attachment portion 38 is fixed in the concave portion 32A. The screw gauge 36 is formed with a male screw portion 37 that is screwed into the female screw portion 52 of the workpiece 50.

  Further, the unit 22 is integrally configured by a sleeve member 24, a moving plate 26, a cylindrical body 30, a holder member 32, a screw gauge 36, a motor 28, and the like. When the screw portion 37 of the screw gauge 36 is screwed into the screw portion 52 of the workpiece 50, the sleeve member 24 is slid by the guide member 14, and the unit 22 is moved upward as a unit. Further, when the sleeve member 24 moves downward, the bottom portion of the motor 28 can come into contact with the lower plate 12 fixed to the lower portion of the guide member 14, and the unit 22 is prevented from falling.

  A tubular body 40 is attached to the lower portion of the moving plate 26 outside the sleeve member 24, and a gauge 41 is provided at the lower portion of the tubular body 40. The gauge 41 is inserted into an opening 12A provided in the lower plate 12, and an encoder 42 that reads the scale of the gauge 41 is provided at a position facing the gauge 41. The encoder 42 measures the stroke length from the start to the stop when the gauge 41 moves in the vertical direction integrally with the unit 22.

  The encoder 42 is connected to the control unit 46 via the wiring 44. In the control unit 46, the standard value of the screwing amount of the screw gauge 36 is stored in the memory in advance, and the stroke length measured by the encoder 42 is compared with the standard value, and the screw unit 52 of the workpiece 50 that is an inspection product is compared. Judge pass / fail. The determination result is configured to be displayed on a display unit (not shown).

  Next, the operation of the inspection device 10 will be described.

  As shown in FIG. 2, a workpiece 50 to be inspected is inserted into the holding portion 18 of the jig 20 by a user's hand. At that time, the holding part 18 is not provided with a member for fixing the work 50, and the work 50 is held by the holding part 18 by its own weight and is prevented from being rotated on the inner wall of the holding part 18 (not shown). The workpiece 50 is held so as not to rotate.

  When the workpiece 50 is set on the holding unit 18, the motor 28 is driven, and the holder member 32 rotates with a predetermined torque in the direction of arrow A via the rotation shaft 28 </ b> A and the support shaft 29, and is supported by the holder member 32. The screw gauge 36 rotates. When the screw portion 37 is engaged with the screw portion 52 of the workpiece 50 by the rotation of the screw gauge 36, the screw portion 37 is screwed into the screw portion 52 as shown in FIG. 3, and the screw gauge 36 rotates in the axial direction of the jig 20. Moving. Along with the movement of the screw gauge 36, the unit 22 is integrally moved upward (in the direction of arrow B), and the gauge 41 is moved in the vertical direction via the tubular body 40.

  When a torque larger than a predetermined value is applied when the screw gauge 36 is screwed into the screw portion 52, a signal for stopping the rotation of the screw gauge 36 is output by the torque control type motor 28. The scale of the gauge 41 when this signal is received is read by the encoder 42, so that the length from the start of the movement of the gauge 41 to the stop position, that is, the position at which the screw gauge 36 starts moving and stops. The stroke length up to is measured.

  Then, the control unit 46 compares the stroke length measured by the encoder 42 with the standard value stored in the memory, and determines whether or not the screw part 52 of the workpiece 50 that is an inspection product is acceptable. The inspection result is displayed on a display unit (not shown).

  After the determination, the control unit 46 reversely rotates the motor 28 with a torque larger than a specified value, and reversely rotates the screw gauge 36 to separate it from the screw portion 52 of the workpiece 50. Then, when the screw gauge 36 returns to the origin (original position), the inspection of the workpiece 50 is finished. Thereafter, the workpiece 50 to be inspected is replaced and set in the holding portion 18, and the screw portion 52 is similarly inspected.

  In such an inspection apparatus 10, since the screw gauge 36 is rotated with a prescribed torque by the torque control type motor 28, the repetition accuracy of the insertion position of the screw gauge 36 into the screw portion 52 of the workpiece 50 is improved. In addition, since the stroke length of the screw gauge 36 is measured by the encoder 42 and the pass / fail of the screw portion 52 of the workpiece 50 is determined, there is no variation in inspection compared to the case of visual determination as in the prior art, and the inspection accuracy is improved. improves. Further, since the screw gauge 36 is screwed into and removed from the screw portion 52 of the work 50 by the motor 28, the workability is remarkably improved as compared with the case where the work is manually inspected as in the prior art. .

  Further, in this inspection apparatus 10, the mounting portion 38 of the screw gauge 36 is fixedly supported by the holder member 32 by tightening the tightening member 34, and the screw gauge 36 can be replaced by loosening the tightening member 34. For this reason, the screw gauge can be exchanged according to the type of workpiece to be inspected, so that the workability can be improved and the cost can be reduced.

  Next, it is a perspective view which shows the test | inspection apparatus 100 which is 2nd Embodiment of this invention.

  In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  In the inspection apparatus 100, a jig 120 is attached to the opening 16 </ b> A of the upper plate 16, and a holding part 118 having a circular opening is formed at the center of the jig 120. A projecting portion 118A having a reduced diameter on the inner diameter side is formed below the holding portion 118, and a workpiece 150, which is an inspection product, is inserted into the holding portion 118. The workpiece 150 is formed with a flange portion 151 that is enlarged in the radial direction, and the flange portion 151 is locked to the protruding portion 18A. The inner wall of the holding part 118 is formed with a detent (not shown) protruding in the inner diameter direction, and holds the work 150 so as not to rotate. The workpiece 150 is formed of an annular member, and a male screw portion 152 is formed on the outer peripheral surface on the tip side from the flange portion 151.

  A circular support body 130 is provided above the attachment portion 38 inserted into the concave portion 32 </ b> A of the holder member 32 via a support shaft 39. A concave portion 130A into which the lower portion of the screw gauge 132 is inserted is formed on the upper portion of the support 130, and a male screw portion 130B is formed on the outer periphery of the support 130.

  On the inner periphery of the screw gauge 132, a female screw portion 134 that is screwed into the screw portion 152 of the workpiece 150 is formed. On the outer periphery of the screw gauge 132, a convex portion 132 </ b> A is formed that is positioned above the support 130 when the screw gauge 132 is inserted into the concave portion 130 </ b> A. A fixing member 136 is externally attached to the support 130 so as to cover the convex portion 132 </ b> A and the side portion of the screw gauge 132. A female screw part 136A is formed on the inner periphery of the fixing member 136. The female screw part 136A is fastened to the male screw part 130B of the support 130, and is formed on the upper part of the fixing member 136. The screw gauge 132 is fixed to the support 130 by the diameter portion 136B pressing the convex portion 132A. In addition, the other structure of this test | inspection apparatus 100 is the same as FIG.

  In such an inspection apparatus 100, as shown in FIG. 5, when the workpiece 150 to be inspected is set on the holding portion 118 of the jig 120, the holder member 32 rotates with a predetermined torque in the direction of arrow A, and the support shaft The screw gauge 132 fixedly supported on the support 130 via 39 rotates. When the screw portion 134 is engaged with the screw portion 152 of the workpiece 150 by the rotation of the screw gauge 132, the screw portion 134 is screwed with the screw portion 152 and the screw gauge 132 is rotated in the axial direction of the jig 120 as shown in FIG. Move with.

  At this time, when a torque greater than a predetermined value is applied to the screw gauge 132, the rotation of the holder member 32 is stopped by the torque control type motor 28 (see FIG. 1). Then, the stroke length from the start of movement of the screw gauge 132 to the position where it stops is measured by the encoder 42 (see FIG. 1), and this stroke length is compared with the standard value, so The acceptability of the screw part 152 is determined.

  In such an inspection device 100, the workability in inspection is improved, and there is no variation in inspection as compared with the case of visual determination as in the prior art, and inspection accuracy is improved. Further, since the screw gauge 132 is fixed to the support 130 by fastening the female screw portion 136A of the fixing member 136 to the male screw portion 130B of the support 130, the screw gauge 132 can be easily replaced. For this reason, the screw gauge can be exchanged according to the type of workpiece to be inspected, so that the workability can be improved and the cost can be reduced.

  In the inspection device of the above embodiment, the control unit 46 determines whether or not the workpieces 50 and 150 that are the inspection products are acceptable based on the stroke length measured by the encoder 42, but the configuration is not limited to this. For example, the measured stroke length may be displayed on the display unit, and the user may visually determine whether the workpiece is acceptable or not.

It is a partially cutaway side view showing the inspection device according to the first embodiment of the present invention. In the inspection apparatus shown in FIG. 1, it is a partially cutaway side view showing a state before a screw part of a screw gauge is screwed into a screw part of a workpiece. FIG. 2 is a partial cross-sectional view illustrating a state in which a screw portion of a screw gauge is screwed into a screw portion of a workpiece in the inspection device illustrated in FIG. 1. It is a test | inspection apparatus which is 2nd Embodiment of this invention, Comprising: It is a fragmentary sectional view which shows the state before the screw part of a screw gauge is screwed in the screw part of a workpiece | work. FIG. 5 is a partial cross-sectional view showing a state in which the screw portion of the screw gauge is screwed into the screw portion of the workpiece in the inspection device shown in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inspection apparatus 12 Lower plate 14 Guide member 16 Upper plate 18 Holding part 20 Jig (work receiving jig)
22 Unit 24 Sleeve member 26 Moving plate 28 Motor (torque control type motor)
30 Cylinder 32 Holder member 34 Tightening member 36 Screw gauge 37 Screw part 38 Mounting part 41 Gauge 42 Encoder 44 Wiring 46 Control part (determination means)
50 Work 52 Screw part 100 Inspection device 118 Holding part 120 Jig (work receiving jig)
130 Support 132 Screw Gauge 134 Screw Part 136 Fixing Member 150 Work 151 Flange 152 Screw Part

Claims (4)

An inspection device for inspecting a screw part of a workpiece,
A workpiece receiving jig for holding the workpiece so as not to rotate;
A screw gauge to be screwed into a thread portion of the workpiece held by the workpiece receiving jig;
A holder member provided so as to be movable in the axial direction of the workpiece receiving jig, and supporting the screw gauge;
A torque control type motor that is provided on the holder member, rotates the holder member with a predetermined torque, and stops rotating when a torque greater than a predetermined value is applied;
An encoder for measuring an axial stroke length of the screw gauge;
Inspection equipment characterized by comprising:   The inspection apparatus according to claim 1, further comprising a determination unit that determines whether or not the screw portion of the workpiece is inspected based on a stroke length measured by the encoder.   3. The inspection apparatus according to claim 2, wherein the torque control type motor rotates the holder member reversely with a torque larger than the specified torque and returns to the origin after the determination by the determination means.   The inspection device according to any one of claims 1 to 3, wherein the screw gauge is supported by the holder member in a replaceable manner.

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