WO2021192989A1 - Dispositif de mesure de dimension à trois points et procédé de mesure de dimension à trois points - Google Patents

Dispositif de mesure de dimension à trois points et procédé de mesure de dimension à trois points Download PDF

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Publication number
WO2021192989A1
WO2021192989A1 PCT/JP2021/009140 JP2021009140W WO2021192989A1 WO 2021192989 A1 WO2021192989 A1 WO 2021192989A1 JP 2021009140 W JP2021009140 W JP 2021009140W WO 2021192989 A1 WO2021192989 A1 WO 2021192989A1
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WIPO (PCT)
Prior art keywords
worm gear
needle
gauge
measuring device
holding
Prior art date
Application number
PCT/JP2021/009140
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English (en)
Japanese (ja)
Inventor
鈴木弘朗
大澤一弘
Original Assignee
株式会社鈴木商店
株式会社モス
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Application filed by 株式会社鈴木商店, 株式会社モス filed Critical 株式会社鈴木商店
Publication of WO2021192989A1 publication Critical patent/WO2021192989A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters

Definitions

  • the present invention relates to a three-needle dimension measuring device and a three-needle dimension measuring method.
  • the dimension between the interdental grooves of the gears is generally inspected by measuring the overpin diameter, and a measuring device capable of reducing the trouble of measuring the overpin diameter is known (for example, a patent). Reference 1).
  • the overpin diameter may also be measured for a worm gear, which is a screw-shaped gear.
  • the overpin diameter of the worm gear is measured as a three-needle dimension measured using three rod-shaped gauges. Of the three gauges, two are located in the thread groove located on one side of the center axis of the worm gear, and the other gauge is opposite across the center axis of the worm gear. It is placed in the thread groove located on the side so as to face the two gauges.
  • the three-needle dimension is measured by reading the distance between gauges arranged opposite to each other with the worm gear in between, for example, with a micrometer.
  • the thread grooves of the worm gear are provided in a spiral shape, and it is difficult to arrange the three gauges used for measurement in the same manner for any worm gear to be inspected. If the position where the gauge is arranged is different for each worm gear to be inspected, the measurement error will be large and it will be difficult to maintain the quality level of a large number of worm gears. Patent Document 1 does not assume that the overpin diameter of the worm gear is measured, and does not solve such a problem.
  • the present invention has been made in view of the above problems, and an object of the present invention is to improve the measurement accuracy of the three-needle dimension in a worm gear.
  • the three-needle dimension measuring device of the present invention adjusts the extraction unit that extracts the characteristic portion on the outer shape of the worm gear to be measured for the three-needle dimension and the worm gear so that the characteristic portion is arranged at a predetermined position.
  • the adjusting unit and the worm gear whose state has been adjusted by the adjusting unit are supplied, and a gauge for measuring the three-needle dimension of the supplied worm gear is formed in the threaded portion of the worm gear. It is characterized by being provided so as to be in contact with and separated from the gear, and provided with a measuring table for measuring the three-needle dimension of the worm gear in a state where the gauge is arranged in the thread groove.
  • the extraction unit includes an imaging unit that images the appearance of the worm gear, and performs an appearance inspection of the worm gear based on the imaging data of the worm gear imaged by the imaging unit.
  • the mode may be further provided with a visual inspection unit.
  • the extraction unit can be in a mode of extracting the end portion of the screw portion as a feature portion.
  • the measuring table holds a first holding portion for holding the first gauge and the second gauge included in the gauge, and a third gauge included in the gauge.
  • the three-needle dimension measuring device is further provided with a fixture for fixing the first holding portion to the first reference portion and a fixture for fixing the second holding portion to the second reference portion. Can be done.
  • the adjusting portion includes a grip portion that grips the end portion of the worm gear and a rotating portion that rotates the worm gear gripped by the grip portion around an axis. can do.
  • the worm gear is gripped and at least a position where the extraction unit extracts the characteristic portion and a transport unit for sequentially transporting the worm gear to the measuring table are provided. good.
  • the transport unit may be provided on a rotary table, and the position where the extraction unit extracts the characteristic portion and the measurement table may be arranged around the rotary table, respectively.
  • the three-needle dimension measurement method of the present invention includes an extraction step of extracting a feature portion on the outer shape of the worm gear to be measured for the three-needle dimension, and adjusting the worm gear to a state in which the feature portion is arranged at a predetermined position.
  • the adjusting step and the worm gear whose state has been adjusted in the adjusting step are held by the first holding portion for holding the first gauge, the second gauge and the third gauge, and the first holding portion. It is characterized by including a step of supplying the worm gear between the second holding portion and the second holding portion provided so as to be relatively close to each other and a measuring step of measuring the three-needle dimension of the worm gear.
  • FIG. 1 is an explanatory diagram schematically showing a schematic configuration of a three-needle dimension measuring device according to an embodiment.
  • 2 (A) to 2 (C) are drawings showing the outer shape of the worm gear to be measured, FIG. 2 (A) is a front view, FIG. 2 (B) is a side view, and FIG. 2 (C) is a side view. It is a perspective view.
  • 3 (A) to 3 (C) are drawings showing a holding table, FIG. 3 (A) is a plan view, FIG. 3 (B) is a side view, and FIG. 3 (C) is a front view.
  • FIG. 4 (A) is an explanatory view showing how the first roller included in the grip portion descends, and FIG.
  • FIG. 4 (B) is an explanatory view showing how the worm gear is gripped by the grip portion.
  • C) is an explanatory view showing how the worm gear gripped by the grip portion is rotated.
  • 5 (A) and 5 (B) are explanatory views showing how the worm gear is supplied onto the supply tray, FIG. 5 (A) is an explanatory view viewed from above, and FIG. 5 (B) is a side view. It is an explanatory diagram seen from the side.
  • FIG. 6 is an explanatory view showing how the worm gear is rotated by the second camera to image the outer shape of the worm gear, and the worm gear is rotated to arrange the characteristic portion of the worm gear at a predetermined position. be.
  • FIG. 6 is an explanatory view showing how the worm gear is rotated by the second camera to image the outer shape of the worm gear, and the worm gear is rotated to arrange the characteristic portion of the worm gear at a predetermined position. be.
  • FIG. 7A is an explanatory view showing how the worm gear rotates
  • FIG. 7B is an example of an image obtained by imaging the rotating worm gear.
  • 8 (A) and 8 (B) are explanatory views showing a state in which a gauge is arranged on the threaded portion of the worm gear in order to measure the three-needle dimension
  • FIG. 8 (A) shows a state viewed from above. It is explanatory drawing which shows typically
  • FIG. 8B is an explanatory view which shows the state which it saw from the front.
  • FIG. 9 is a perspective view schematically showing a state in which a gauge is arranged in the thread groove of the worm gear in order to measure the three-needle dimension.
  • FIG. 9 is a perspective view schematically showing a state in which a gauge is arranged in the thread groove of the worm gear in order to measure the three-needle dimension.
  • FIG. 10 is an explanatory view schematically showing the three-needle dimension.
  • 11 (A) and 11 (B) are explanatory views showing a schematic configuration of a discharge stage, FIG. 11 (A) is an explanatory view viewed from above, and FIG. 11 (B) is an explanatory view viewed from the front. It is a figure.
  • FIG. 12 is an example of a flowchart showing a method of measuring the three-needle dimension.
  • FIG. 13 is an explanatory diagram schematically showing another example of specifying a characteristic portion in the worm gear.
  • FIG. 1 is an explanatory diagram schematically showing a schematic configuration of the measuring device 1 of the embodiment.
  • the measuring device 1 measures the three-needle dimension of the worm gear 100.
  • the measuring device 1 includes an index table 2 which is a rotary table rotatably provided by the drive motor 2a.
  • a charging stage 20 for supplying the worm gear 100, an appearance inspection stage 30 for imaging the outer shape of the worm gear 100, a three-needle dimension measuring stage 40 as a measuring table for measuring the three-needle dimension, and a discharging stage 50 are arranged.
  • the loading stage 20, the visual inspection stage 30, the three-needle dimension measuring stage 40, and the discharging stage 50 are arranged at intervals of 90 °.
  • each holding table 10 for holding the worm gear 100 is arranged at intervals of 90 °.
  • the four holding tables 10 circulate from the input stage 20 to the discharge stage 50 by rotating the index table 2.
  • each holding table 10 can move forward and backward along the radial direction of the index table 2.
  • FIGS. 2 (A) to 2 (C) are drawings showing the outer shape of the worm gear 100 to be measured
  • FIG. 2 (A) is a front view
  • FIG. 2 (B) is a side view
  • FIG. 2 (C) Is a perspective view.
  • the specific shape of the screw portion 104 is omitted.
  • the worm gear 100 includes a first end portion 101 and a second end portion 102.
  • the worm gear 100 includes a chamfered portion 103 on the first end 101 side and a threaded portion 104 on the second end 102 side.
  • the threaded portion 104 is provided with a spirally continuous threaded groove 105.
  • the chamfered portions 103 are provided at two locations separated by 180 °.
  • the threaded portion 104 has a first end 101 side as its cutting start portion 104a and a second end 102 side as its cutting end portion 104b.
  • the holding base 10 grips the first end 101 side of the worm gear 100 and patrols each stage.
  • the measuring device 1 includes a control unit 3.
  • the control unit 3 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a storage unit (for example, an HDD (Hard Disk Drive)), an input / output interface, and a drive for a portable storage medium. Etc. are provided. Each of these components of the control unit 3 is connected to a bus.
  • the CPU executes a program stored in the ROM or HDD, or a program read from the portable storage medium by the drive for the portable storage medium, and a part of the functions of the control unit 3 is realized.
  • FIGS. 3 (A) to 3 (C) and FIGS. 4 (A) to 4 (C) together with FIG. 3 (A) to 3 (C) are drawings showing the holding table 10, FIG. 3 (A) is a plan view, FIG. 3 (B) is a side view, and FIG. 3 (C) is a front view.
  • FIG. 4A is an explanatory view showing how the first roller 14a included in the grip portion 14 descends
  • FIG. 4B is an explanatory diagram showing how the grip portion 14 grips the worm gear 100.
  • FIG. 4C is an explanatory view showing how the worm gear 100 gripped by the grip portion 14 is rotated.
  • the holding table 10 functions as a transport unit, and four holding tables 10 are arranged on the index table 2. Each holding table 10 is the same.
  • the holding base 10 includes a main body portion 11, an elevating column 12, a slider 13, and a grip portion 14.
  • the main body 11 is provided so as to be able to move forward and backward on the index table 2 as shown by arrow 15 in FIG.
  • the main body 11 is electrically connected to the forward / backward instruction unit 3c included in the control unit 3, and is positioned at a position suitable for the process executed in each stage based on the instruction of the forward / backward instruction unit 3c. You can move.
  • the elevating column 12 is provided on the main body 11 so that the holding table 10 is mounted on the index table 2 and is located on the outer peripheral side of the index table 2, that is, so as to face each stage.
  • a slider 13 is provided on the elevating column 12 so as to be slidable along the vertical direction of the elevating column 12.
  • the grip portion 14 includes a first roller 14a, a second roller 14b, and a third roller 14c.
  • the first roller 14a is provided on the slider 13.
  • the second roller 14b and the third roller 14c are provided on the main body 11.
  • the second roller 14b and the third roller 14c are provided in parallel so that their outer peripheral surfaces are in contact with each other.
  • the second roller 14b corresponds to a rotating portion and is rotationally driven by a motor (not shown). As the second roller 14b rotates, the worm gear 100 rotates around the axis AX.
  • a rotation instruction unit 3e included in the control unit 3 is electrically connected to the motor that drives the second roller 14b.
  • the second roller 14b is rotationally driven, but the first roller 14a or the third roller 14c may be rotationally driven. Further, a plurality of rollers may be subject to rotational drive. In short, it suffices if the worm gear 100 gripped by the grip portion 14 can be rotated.
  • a gripping instruction unit 3d included in the control unit 3 is electrically connected to the slider 13.
  • the worm gear 100 is supplied between the first roller 14a and the third roller 14c
  • the slider 13 is lowered as shown in FIG. 4A based on the instruction of the gripping instruction unit 3d
  • FIG. 4A the instruction of the gripping instruction unit 3d
  • FIG. 4B the worm gear 100 is gripped.
  • the second roller 14b rotates as shown by the arrow 71 based on the instruction of the rotation indicating unit 3e
  • the worm gear 100 rotates as shown by the arrow 72.
  • FIGS. 5 (A) and 5 (B) are explanatory views showing how the worm gear 100 is supplied onto the supply tray 22, and FIG. 5 (A) is an explanatory view viewed from above, FIG. 5 (B). Is an explanatory diagram seen from the side.
  • the loading stage 20 includes a feeder 21, a supply tray 22, a reversing device 23, and a first camera 24.
  • the feeder 21 is a gutter-shaped member.
  • the feeder 21 sequentially feeds the worm gear 100 toward the index table 2 as shown by arrow 73 from a product hopper (not shown) in which the manufactured worm gear 100 is stocked.
  • the supply tray 22 is provided so as to face the downstream end of the feeder 21.
  • a wall-shaped stopper 22a is provided at the downstream end of the supply tray 22.
  • the worm gear 100 that has flowed down on the feeder 21 stays on the supply tray 22 in a state of being in contact with the stopper 22a.
  • the reversing device 23 sets the direction of the worm gear 100 on the supply tray 22 when the direction is different from the predetermined direction, that is, when the first end 101 is different from the direction facing the holding base 10. Invert it to the desired orientation. Whether or not the worm gear 100 on the supply tray 22 is in a predetermined direction is determined by the direction determination unit 3a included in the control unit 3 based on the image captured by the first camera 24.
  • the reversing device 23 is arranged so as to face each other, and includes a pair of claws that can be opened and closed as shown by arrow 74. Further, the reversing device 23 is provided so as to be able to move up and down as shown by arrow 76.
  • the reversing device 23 can rotate as shown by arrow 75 based on the instruction of the reversing instruction unit 3b included in the control unit 3 to reverse the direction of the worm gear 100.
  • the worm gear 100 on the supply tray 22 is delivered to the holding base 10, the worm gear 100 is sandwiched by the reversing device 23 and lifted. Therefore, even if the direction of the worm gear 100 thrown onto the supply tray 22 is a predetermined direction, the reversing device 23 sandwiches and lifts the worm gear 100 on the supply tray 22.
  • FIG. 6 shows a state in which the worm gear 100 is rotated by the second camera 31 to image the outer shape of the worm gear 100, and the worm gear 100 is rotated to arrange the characteristic portion of the worm gear 100 at a predetermined position.
  • FIG. 7A is an explanatory view showing how the worm gear 100 rotates
  • FIG. 7B is an example of an image obtained by imaging the rotating worm gear 100.
  • the appearance inspection stage 30 performs an appearance inspection of the worm gear 100 based on the imaging data of the second camera 31 as an imaging unit that images the appearance of the worm gear 100 and the worm gear 100 imaged by the second camera 31. It is equipped with an inspection unit of 3 g.
  • the image captured by the second camera 31 is used for inspecting the appearance of the worm gear 100 by the appearance inspection unit 3g, and is also used for extracting the external features of the worm gear 100.
  • the second camera 31 rotates the second roller 14b as a rotating portion, rotates the worm gear 100 gripped by the grip portion 14 as shown by arrow 77, and continuously images the appearance thereof.
  • the appearance inspection is performed by the appearance inspection unit 3g, and based on the captured image, the screw portion 104 of the worm gear 100 is inspected for scratches or chips, and for foreign matter. ..
  • the cutting start portion 104a of the screw portion 104 is adopted as a characteristic portion on the outer shape of the worm gear 100. Therefore, the second camera 31 functions as an extraction unit for extracting the characteristic portion on the outer shape of the worm gear 100 together with the cutting start portion extraction unit 3f included in the control unit 3. As described above, in the present embodiment, the appearance inspection and the extraction of the characteristic portion of the worm gear 100 are performed based on the image pickup data captured by the second camera 31, so that the inspection can be performed efficiently.
  • FIG. 7B shows a captured image when the worm gear 100 is rotated 2.5 times.
  • the feature portion 104a1 showing the shape of the cutting start portion 104a appears twice.
  • the cutting start portion extraction unit 3f determines which part in the captured image indicates the cutting start portion 104a from the information regarding the shape indicating the cutting start portion 104a stored in advance, and sets the coordinates of that portion to X1.
  • the rotation indicating unit 3e electrically connected to the second roller 14b also functions as an adjusting unit that adjusts the worm gear 100 so that the cutting start portion 104a, which is a characteristic portion thereof, is arranged at a predetermined position.
  • the predetermined position is the coordinate X0 showing the feature portion 104a1 showing the shape of the cutting start portion 104a in the image of the worm gear 100 designated as the master piece.
  • the master piece indicates a reference of a position where the first gauge 45a, the second gauge 45b, and the third gauge 45c (see FIG. 8A and the like), which will be described later, are brought into contact with each other when measuring the three-needle dimension.
  • the worm gear 100 selected for this purpose.
  • the rotation instruction unit 3e rotates the worm gear 100 to be measured from the coordinates X1 indicating the cutting start portion 104a of the worm gear 100 to be measured and the coordinates X0 indicating the cutting start portion 104a of the worm gear 100 designated as the master piece. Calculate the angle. That is, the rotation angle is calculated so that the position of the cutting start portion 104a of the worm gear 100 to be measured coincides with the cutting start portion 104a of the worm gear 100 designated as the master piece.
  • the rotation instruction unit 3e rotates the second roller 14b so that the worm gear 100 gripped by the grip unit 14 is rotated by the calculated rotation angle.
  • the first gauge 45a and the second gauge 45b are contained in the thread groove 105 with the same reference. And a third gauge 45c can be placed.
  • the cutting start portion 104a is selected as the feature portion, but the feature portion is not limited to this, and for example, the cutting end portion 104b may be selected as the feature portion. If there is another part that can be specified as a feature part in the outer shape, that part may be selected as the feature part.
  • 8 (A) and 8 (B) are explanatory views showing a state in which gauges 45a, 45b, and 45c are arranged on the threaded portion 104 of the worm gear 100 in order to measure the three-needle dimension
  • FIG. 8 (A) shows. Is an explanatory view schematically showing a state viewed from above
  • FIG. 8B is an explanatory view showing a state viewed from the front.
  • FIG. 9 is a perspective view schematically showing how the gauges 45a, 45b, and 45c are arranged in the thread groove 105 of the worm gear 100 in order to measure the three-needle dimension.
  • FIG. 10 is an explanatory view schematically showing the three-needle dimension.
  • the three-needle dimension measurement stage 40 includes a first reference plate 41 and a second reference plate 42.
  • the first reference plate 41 includes a first reference surface 41a as a first reference portion.
  • the second reference plate 42 includes a second reference surface 42a as a second reference portion.
  • the first reference plate 41 and the second reference plate 42 are provided so that the first reference surface 41a and the second reference surface 42a are arranged so as to face each other.
  • the first reference plate 41 is located on the lower side
  • the second reference plate 42 is located on the upper side of the first reference plate 41.
  • the second reference plate 42 can be lowered so as to approach the first reference plate 41 as shown by arrow 78 in FIG. 8 (B).
  • the second reference plate 42 can be raised so as to be separated from the first reference plate 41 as shown by arrow 79 in FIG. 8 (B).
  • the second reference plate 42 is electrically connected to the elevating instruction unit 3h included in the control unit 3, and can ascend and descend based on the instruction of the elevating instruction unit 3h.
  • the elevating operation of the second reference plate 42 in the present embodiment is performed by a drive motor (not shown), but it may be elevated by an elevating mechanism that does not use power.
  • the worm gear 100 to be measured has the first reference plate 41 and the first reference plate 41 in a state where the position of the cutting start portion 104a as a feature portion is aligned with the position of the cutting start portion 104a in the master piece. 2 Supply between the reference plate 42 and the reference plate 42.
  • the first reference surface 41a is provided with a first holding portion 43 including a pair of block-shaped members.
  • the first holding portion 43 holds the first gauge 45a and the second gauge 45b.
  • Each of the block-shaped members included in the first holding portion 43 is provided with two groove portions 43a.
  • the end of the first gauge 45a and the end of the second gauge 45b are fitted into the groove 43a.
  • the depth of the groove portion 43a is such that when the first holding portion 43 is installed on the first reference surface 41a, the first gauge 45a and the second gauge 45b are in line contact with the first reference surface 41a along the axial direction, respectively. It is said to be the depth that can be done.
  • the second reference surface 42a is provided with a second holding portion 44 including a pair of block-shaped members.
  • the second holding portion 44 holds the third gauge 45c.
  • a groove 44a is provided in each of the block-shaped members included in the second holding portion 44.
  • the end of the third gauge 45c is fitted into the groove 44a.
  • the depth of the groove 44a is such that when the second holding portion 44 is installed on the second reference surface 42a, the third gauge 45c can make line contact with the second reference surface 42a along the axial direction. ing.
  • the first reference surface 41a is one reference surface when measuring the three-needle dimension of the worm gear 100
  • the second reference surface 42a measures the three-needle dimension of the worm gear 100.
  • the other aspect of the reference when doing so.
  • the distance between the first reference surface 41a and the second reference surface 42a when the gauges 45a, 45b, and 45c are installed in the thread grooves 105 is the three-needle dimension S.
  • the second reference plate 42 is electrically connected to the three-needle dimension measurement unit 3i included in the control unit 3, and the three-needle dimension measurement unit 3i is a second reference surface 42a of the second reference plate 42.
  • the three-needle dimension S is measured based on the height position. That is, the three-needle dimension measuring unit 3i holds information on the height position of the second reference plate 42, and calculates the distance between the first reference surface 41a and the second reference surface 42a based on the information. , Let the distance be the three-needle dimension S.
  • the distance between the first reference surface 41a and the second reference surface 42a may be measured with a dial gauge or the like. good.
  • the block-shaped members included in the first holding portion 43 are fixed to the first reference surface 41a by fixing screws 43b, respectively.
  • the first holding portion 43 can be replaced by removing the fixing screw 43b.
  • the fixing screw 43b is an example of a fixing tool. In FIG. 8A, the fixing screw 43b is omitted.
  • the block-shaped members included in the second holding portion 44 are fixed to the second reference surface 42a by the fixing screws 44b, respectively.
  • the second holding portion 44 can be replaced by removing the fixing screw 44b.
  • the fixing screw 44b is an example of a fixing tool. In FIG. 8A, the fixing screw 44b is omitted.
  • the first holding portion 43 and the second holding portion 44 can be appropriately replaced according to the type of the worm gear 100.
  • the measuring device can be used.
  • the versatility of 1 can be improved.
  • the fixtures for fixing the first holding portion 43 and the second holding portion 44 are not limited to the fixing screws 43b and 44b.
  • the first holding portion 43 and the second holding portion 44 may be detachably fixed by a holding plate provided so as to be slidable.
  • the first reference plate 41 is arranged on the lower side and the second reference plate 42 is arranged on the lower side, but these may be arranged interchangeably.
  • the arrangement of these reference plates is not limited to the top and bottom. Further, these reference plates may be moved by any reference plate as long as they are relatively close to each other and can be separated from each other.
  • the first gauge 45a and the second gauge 45b are arranged in the adjacent thread grooves 105 when the threaded portion 104 of the worm gear 100 is viewed from the side surface, but the first gauge The 45a and the second gauge 45b may be arranged apart from each other.
  • the first reference surface 41a is adopted as the first reference portion and the second reference surface 42a is adopted as the second reference portion, but the first reference portion and the second reference portion have three. Other parts that correlate with the needle size may be adopted.
  • FIGS. 11 (A) and 11 (B) are explanatory views showing a schematic configuration of the discharge stage 50
  • FIG. 11 (A) is an explanatory view viewed from above
  • FIG. 11 (B) is an explanatory view viewed from the front. Is.
  • the sorting unit 51 is formed of a box-shaped member, and includes a sorting plate 51a provided so as to be swingable inside.
  • the sorting plate 51a is oscillated by the sorting plate drive motor 51b.
  • the sorting plate 51a sorts the worm gear 100, which has been measured, into either the non-defective stock section 52 or the defective stock section 53 based on the measurement result of the three-needle dimension of the worm gear 100.
  • the sorting plate drive motor 51b is electrically connected to the discharge port selection unit 3j included in the control unit 3.
  • the discharge port selection unit 3j determines whether or not the three-needle dimension obtained by the three-needle dimension measurement unit 3i is within the reference value, and changes the posture of the sorting plate 51a based on the determination result. As a result, the worm gear 100 whose measurement has been completed is sorted into either the non-defective stock section 52 or the defective stock section 53.
  • the holding table 10 goes around each stage as described above.
  • the drive motor 2a included in the index table 2 on which the holding table 10 is mounted is electrically connected to the table rotation control unit 3k included in the control unit 3, and is an index table according to the progress of the process in each stage. Rotate 2.
  • the measurement of the three-needle size can be automatically performed by operating the measuring device 1 of the embodiment.
  • gauges 45a, 45b, 45c corresponding to the specifications of the worm gear 100 to be measured are set on the three-needle dimension measurement stage 40.
  • the holding base 10 facing the closing stage 20 holds the worm gear 100 to be measured.
  • the reversing device 23 operates and the direction of the worm gear 100 is reversed.
  • the index table 2 rotates, and the holding table 10 moves to a position facing the visual inspection stage 30.
  • step S1 The measurement of the three-needle size is started at this visual inspection stage 30. That is, the extraction of the feature portion of step S1 is started.
  • step S1 the worm gear 100 held by the holding table 10 that has moved to a position facing the visual inspection stage 30 rotates. The rotation of the worm gear 100 is continuously imaged by the second camera 31. Then, based on the captured image, it is determined from the information about the shape indicating the cutting start portion 104a as the feature portion, which part in the captured image indicates the cutting start portion 104a, and the coordinates of that portion are determined. It is stored as X1 (extraction step).
  • step S2 the feature portion is arranged at a predetermined position (adjustment step). Specifically, the worm gear 100 to be measured is rotated so that the position of the cutting start portion 104a of the worm gear 100 to be measured coincides with the cutting start portion 104a of the master piece stored in advance. The rotation of the worm gear 100 is executed based on the instruction of the rotation instruction unit 3e.
  • step S3 the measurement target is supplied to the three-needle dimension measurement stage 40 for measuring the three-needle dimension.
  • the holding table 10 holding the worm gear 100 whose position of the cutting start portion 104a is adjusted moves to a position facing the three-needle dimension measuring stage 40 by rotating the index table 2. ..
  • the holding base 10 advances so that the worm gear 100 is located between the first reference plate 41 and the second reference plate 42.
  • step S4 the three-needle dimension is measured (measurement step).
  • the measurement of the three-needle size is performed in a state where the second reference plate 42 is lowered and the gauges 45a, 45b, and 45c are installed in the screw grooves 105, respectively. Then, the distance between the first reference surface 41a and the second reference surface 42a, that is, the three-needle dimension S is measured.
  • step S5 the measurement target is sorted based on the measurement result of the three-needle size.
  • the holding table 10 holding the worm gear 100 for which the measurement of the three-needle size has been completed moves to a position facing the discharge stage 50 as the index table 2 rotates.
  • the worm gear 100 is sent to the non-defective stock unit 52 shown in FIGS. 11 (A) and 11 (B).
  • the worm gear 100 is sent to the defective stock unit 53.
  • the worm gear 100 is released from the gripping state of the worm gear 100 by the gripping portion 14 when the slider 13 provided on the holding base 10 is raised, and falls into the sorting portion 51 according to the position of the sorting plate 51a. , Sorted.
  • the holding table 10 released from holding the worm gear 100 moves to a position facing the closing stage 20 again by rotating the index table 2, and receives the supply of the next worm gear 100. , Move to the process for measuring the three-needle size.
  • the measuring device 1 repeats such a process.
  • stages for executing each process are arranged around the rotating index table 2, but the form of each stage is not limited to this form.
  • the form of each stage and the flow line of the holding table 10 can be appropriately changed as needed. For example, a position where the extraction unit extracts the feature portion, a stage that functions as a measuring table, or the like may be arranged linearly, and the holding table 10 may be moved linearly.
  • a feature portion on the outer shape of the worm gear 100 is extracted, and the feature portion is adjusted so as to be arranged at a predetermined position. Then, gauges 45a, 45b, and 45c for measuring the three-needle dimension are installed in the screw groove 105 in that state, and the three-needle dimension is measured. Therefore, for many worm gears 100, it is possible to measure the three-needle size under unified conditions. As a result, the measurement accuracy of the three-needle dimension can be improved.
  • the positions where the gauges 45a, 45b, 45c are arranged are specified, when the gauges 45a, 45b, 45c are arranged, it is not necessary to adjust the positions where the gauges 45a, 45b, 45c are arranged, and the three-needle size. The labor in measurement can be reduced.
  • the accuracy of identifying the feature portion is improved, and the feature portion can be easily identified.
  • the accuracy of identifying the feature portion is improved, and the identification is facilitated.
  • the gauges 45a, 45b, 45c are similarly provided each time. Can be placed in the thread groove 105.
  • the present embodiment includes a fixture for fixing the first holding portion 43 to the first reference portion and a fixture for fixing the second holding portion 44 to the second reference portion, the first holding portion 43 and the first holding portion 43 and the second holding portion 44 are provided. 2
  • the holding portion 44 can be replaced, which is highly versatile.
  • the worm gear 100 is provided with a rotating portion that rotates around the axis AX, it is easy to adjust the characteristic portion to a predetermined position.
  • the worm gear 100 is sequentially conveyed to a position where the worm gear 100 is gripped and the extraction unit extracts a feature portion (visual inspection stage 30) and a measuring table (three-needle dimension measurement stage 40).
  • a unit holding table 10) is provided.
  • the worm gear 100 can be transported to a position where each process is executed.
  • the transport unit is provided on the rotary table (index table 2), and the position where the extraction unit extracts the characteristic portion (visual inspection stage 30) and the measuring table (three-needle dimension measurement stage 40) rotate respectively. It is placed around the table.
  • the worm gear 100 can be efficiently conveyed.
  • the feature portion may be adjusted to a predetermined position while moving to the measuring table. As a result, the process time can be shortened.
  • the loading stage 20, the visual inspection stage 30, the three-needle dimension measuring stage 40, and the discharging stage 50 are provided, but stages other than these may be provided.
  • a cleaning stage for cleaning the worm gear 100 and a measurement stage for measuring the dimensions of each part of the worm gear 100 may be arranged.
  • the feature portion is extracted based on the image captured by the second camera 31 as the imaging unit for capturing the appearance of the worm gear 100, but instead of the second camera 31, FIG. 13
  • the laser apparatus 32 as shown in the above may be adopted.
  • a conventionally known method can be adopted as long as the characteristic portion on the outer shape of the worm gear 100 can be extracted.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

L'invention concerne un dispositif de mesure de dimension à trois points pourvu : d'une unité d'extraction qui extrait une partie caractéristique sur la forme externe d'un engrenage à vis sans fin à mesurer pour des dimensions à trois points; d'une unité de réglage qui règle l'engrenage à vis sans fin dans un état dans lequel la partie caractéristique est disposée à une position prescrite; et d'une base de mesure qui est alimentée par l'engrenage à vis sans fin ajusté dans l'état par l'unité de réglage, qui comprend une jauge prévue pour mesurer les dimensions à trois points de l'engrenage à vis sans fin alimenté de façon à pouvoir entrer en contact avec/se séparer d'une rainure de vis formée dans une partie de vis de l'engrenage à vis sans fin et sur laquelle les dimensions à trois points de l'engrenage à vis sans fin sont mesurées dans un état dans lequel la jauge est disposée dans la rainure de vis.　
PCT/JP2021/009140 2020-03-25 2021-03-09 Dispositif de mesure de dimension à trois points et procédé de mesure de dimension à trois points WO2021192989A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020054644A JP6989858B2 (ja) 2020-03-25 2020-03-25 三針寸法測定装置及び三針寸法測定方法
JP2020-054644 2020-03-25

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WO2021192989A1 true WO2021192989A1 (fr) 2021-09-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480388A (en) * 1983-05-02 1984-11-06 Brien Orlin P O Apparatus for three-wire method of thread pitch diameter measurement
JPH10111122A (ja) * 1996-10-03 1998-04-28 Honda Motor Co Ltd ボールねじユニットのスクリュー測定装置及びナット測定装置
JP2003004437A (ja) * 2001-06-26 2003-01-08 Honda Motor Co Ltd 測定用ノギス
JP2005214751A (ja) * 2004-01-28 2005-08-11 Tsunehiro Yoshida ネジの検査装置
JP2007240489A (ja) * 2006-03-13 2007-09-20 Space Creation:Kk オーバーピン径計測装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480388A (en) * 1983-05-02 1984-11-06 Brien Orlin P O Apparatus for three-wire method of thread pitch diameter measurement
JPH10111122A (ja) * 1996-10-03 1998-04-28 Honda Motor Co Ltd ボールねじユニットのスクリュー測定装置及びナット測定装置
JP2003004437A (ja) * 2001-06-26 2003-01-08 Honda Motor Co Ltd 測定用ノギス
JP2005214751A (ja) * 2004-01-28 2005-08-11 Tsunehiro Yoshida ネジの検査装置
JP2007240489A (ja) * 2006-03-13 2007-09-20 Space Creation:Kk オーバーピン径計測装置

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JP2021156620A (ja) 2021-10-07

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