CN102128598B - Checking device for thread - Google Patents
Checking device for thread Download PDFInfo
- Publication number
- CN102128598B CN102128598B CN201010593035.2A CN201010593035A CN102128598B CN 102128598 B CN102128598 B CN 102128598B CN 201010593035 A CN201010593035 A CN 201010593035A CN 102128598 B CN102128598 B CN 102128598B
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- CN
- China
- Prior art keywords
- thread
- light source
- ridge
- light
- screw thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2425—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures of screw-threads
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9515—Objects of complex shape, e.g. examined with use of a surface follower device
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The present invention provides a checking device for thread, which can excellently identify any deformation of the thread. The checking device for the thread according to the invention is provided with the following components: a light source part (2) which partially and continuously irradiate a rotating outer surface of the thread; an image pickup sensor (5) which receives the reflected light from the thread; and an image processing part (6) which identifies the shape of the thread according to the rotation information and camera pickup information of the thread. The invention is characterized in that: the image pickup sensor does not identify the reflected light when the shape of the thread is normal; and at a state that an expected convex or concave part exists on the thread, observation is performed for at least an area which can receive the reflected light caused by the convex or concave part.
Description
Technical field
The present invention relates to the testing fixture of ridge.In particular to for finding the concavo-convex testing fixture be formed on external thread tooth.
Background technology
The spark plug that the engine of automobile, heating system use, from the easiness of replacement operation, has thread structure.In addition, the ball-screw (ball screw) that the position adjustment of objective table (stage) uses also adopts thread structure.But, when screw thread occur bursting tooth etc. and occur concavo-convex time, external thread and internal thread can not reliably screw togather, or, namely allow to screw togather and also cannot unload.Therefore, in the manufacturing process of above-mentioned screw thread, double thread carries out shape inspection, checks whether screw thread occurs that the shape of routed tooth or ridge is whether in allowed band.
As the device checking ridge shape, such as, Patent Document 1 discloses and irradiate light from the sidepiece of ridge side and device that the transmitted light that the sidepiece in opposition side obtains is taken.The projection (silhouette) of ridge is there is in radiating light by ridge partial occlusion, and, the shape of screw thread is grasped by detecting the light transmitted from thread-grooved portion.But such device can detect certain shape defect, but None-identified is bad sometimes according to the difference of deformation extent.
Fig. 6 represents the schematic configuration of the principle for illustration of testing fixture in the past.A () ~ (d) represents that the shape of check object thing is different, (a1) ~ (d1) represents the structure configuring light source, right side configuration image sensor (Image Sensor) across check object thing in left side.(a2) state of the check object thing seen from light source side ~ (d2) is represented.For convenience of explanation, check object thing adopts leg-of-mutton sheet material substantially.
(a) of Fig. 6 represents that check object thing is normal state.Block from a part of light inspected object thing in the radiating light of light source, utilization is not blocked and arrives the light of imageing sensor, identifies the shape of check object thing.
(b) of Fig. 6 represents the state of the summit shortcoming of check object thing.In this case, because the radiating light from light source is not by shortcoming partial occlusion, therefore imageing sensor identifies the shape shown in (b2).Further, by compared with the normal pattern (Pattern) prestored, and shape defect can be detected.
(c) and (b) of Fig. 6 is identical, the state being check object composition deformation, represents burst badly and define the state of burr (overlap) in the summit of check object thing.In this case, burr is also identified as shield portions by imageing sensor.
(d) expression of Fig. 6 forms irregular state at the sidepiece of the light source side of check object thing.In this case, the global shape of check object thing is identical with normal pattern, and therefore image sensor cannot detect concavo-convex presence or absence.
Like this, when with the direction intersected to the light path of imageing sensor from light source on there is change of shape, imageing sensor can detect this change of shape, but do not affecting lightproof area along when there is change of shape from light source on the direct of travel of the light path of imageing sensor, as a result, change of shape can not be detected.
In addition, in patent documentation 2, patent documentation 3, disclose and irradiate light from the sidepiece of ridge, read the structure of the reflected light of (Sensing) this irradiation light.But, such device perhaps also can identify ridge presence or absence, ridge distortion presence or absence, but can not identify exactly be which type of distortion.In addition, a part for ridge occurs concavo-convex, this device also receives this concavo-convex reflected light.
That is, known testing fixture perhaps can detect certain defective products, but sometimes can not identify bad according to the difference of the intensity of variation of shape, and there is the problem cannot carrying out high-precision detection.
But, can accuracy of detection be improved by using many light sources to take time from multiple angular illumination light, but screw thread is originally very little, is difficult to detect in high sensitivity produce due to the distortion of ridge concavo-convex.
Patent documentation 1: Japanese Laid-Open Patent Publication 62-49203
Patent documentation 2: Japanese Unexamined Patent Publication 5-240738
Patent documentation 3: Japanese Laid-Open Patent Publication 55-70702
Summary of the invention
The testing fixture that any distortion that the invention provides a kind of double thread tooth can both identify well.
In order to solve above-mentioned problem, the testing fixture of ridge of the present invention has: light source portion, its to rotate screw thread outside surface local and irradiate continuously; Image sensor, it receives the reflected light from screw thread; And image processing part, it identifies the shape of ridge according to the rotation information of screw thread and shooting information, it is characterized in that, above-mentioned image sensor is the above-mentioned reflected light of nonrecognition when ridge shape is normal, only when ridge exist be not supposed to concavo-convex, at least the region that can receive this concavo-convex reflected light caused is observed.
And the testing fixture of ridge of the present invention also has following feature, and above-mentioned light source portion is formed with two, and relative to above-mentioned zone, irradiate this ridge from the front of the sense of rotation of screw thread and rear.
And the testing fixture of ridge of the present invention also has following feature, the radiation wavelength of above-mentioned light source portion is different.
The testing fixture of ridge of the present invention is configured with image sensor at such as upper/lower positions, receives the position of the reflected light from thread surface namely only form irregular situation on ridge under, therefore, it is possible to reliably detect that to be formed on screw thread concavo-convex.And, by arranging two light sources of the light of radiation different wave length, concavo-convex shape can be grasped more accurately according to the deep or light or color characteristics of shooting image.
Accompanying drawing explanation
Fig. 1 represents the schematic configuration of the testing fixture of ridge of the present invention.
Fig. 2 represents the schematic configuration of the inspection method of ridge of the present invention.
Fig. 3 represents the schematic configuration of the inspection method of ridge of the present invention.
Fig. 4 represents the schematic configuration of the inspection method of ridge of the present invention.
Fig. 5 is the concept map of the testing fixture represented for illustration of ridge of the present invention.
Fig. 6 is the figure of the testing fixture represented for illustration of ridge in the past.
Embodiment
Fig. 1 represents the schematic configuration of ridge testing fixture of the present invention.Screw thread as check object is installed on the rotating part 1a of holding station 1.Screw thread is along illustrated direction under the effect of rotating part 1a, and namely edge rotates with direction during internal screw-thread screw.Radiating light from light source 2 (2a, 2b) passes the outside surface that diffuser plate 3 (3a, 3b) is irradiated to screw thread.Due to the existence of diffuser plate 3 (3a, 3b), thus the entirety of externally threaded length direction can be irradiated to.Wherein, externally threaded length is such as about 2 ~ 3mm.In addition, Fig. 1 eliminates lens described later, image sensor, image processing part.
Fig. 2 represents the state of looking into the distance the testing fixture shown in Fig. 1 from top.Light source 2a and light source 2b and diffuser plate 3a and diffuser plate 3b is respectively across the imaginary line A of connecting thread, lens 4, image sensor 5 to be the configuration of line symmetry shape.The light L1a that self-diffusion plate 3a radiates and light L2a incides on image sensor 5 via lens 4 in thread outer surface reflection.Equally, the light L1b radiated by diffuser plate 3b and light L2b also incides on image sensor 5 via lens 4 in thread outer surface reflection.The input information of image sensor 5 is sent to image processing part 6, image processing part 6 can according to from image sensor 5 optical information, identify the shape of the whole side face of screw thread from the rotation information of holding station 1.In addition, image sensor 5 adopts the area sensor with the area corresponding with the size of screw thread.
Lens 4 receive the reflected light at the region b of thread outer surface in the reflected light of the region a of thread outer surface and the radiating light of light source 2b in the radiating light of light source 2a.The radiating light of light source 2 (2a, 2b) is also irradiated to the thread outer surface region (such as, region c) beyond above-mentioned zone (region a, region b) through diffuser plate 3 (3a, 3b).But due to the relation of incident angle, these irradiate light and do not enter lens 4.Therefore, if the shape of ridge is normal, then the screw thread form of above-mentioned zone a and region b is only received at image sensor 5.
The figure of light source when Fig. 3 represents that the shape for illustration of ridge is normal and the light path between lens.Wherein, the tooth of screw thread and groove are formed continuously along with paper vertical direction, but accompanying drawing is in order to represent the state of crosscut screw thread and not show the shape of ridge.
In figure 3, (region reflected light a) injects lens 4 in the region formed the position P2a of the thread outer surface that the position P1a of the thread outer surface irradiated through the light L1a of diffuser plate 3a in the radiating light of light source 2a and light L2a irradiates.Equally, the reflected light in the region (region b) formed the position P2b of the thread outer surface that the position P1b of the thread outer surface irradiated through the light L1b of diffuser plate 3b in the radiating light of light source 2b and light source L2b irradiates also injects lens 4.On the other hand, such as, as light L3a, when being irradiated to region (the region c) that have left region a, this reflected light does not inject lens 4.Therefore, for the screw thread rotated, omit illustrated image sensor and identify from the reflected light of region a and the reflected light from region b simultaneously, and the reflected light of nonrecognition region c.In addition, for the length direction (direction that during screw thread rotation, screw thread is advanced) of screw thread, diffuser plate 3 (3a, 3b) can be utilized to irradiate the entirety of ridge part simultaneously.Therefore, if make screw thread at least rotate once, then image processing part 6 can grasp the shape of whole ridge part.
Fig. 4 represents abnormal to the shape at ridge, wherein a part exists be not supposed to concavo-convex time light source and lens between the figure that is described of light path.Identical with Fig. 3, the reflected light of region a and the reflected light of region b are injected lens 4 and are caught on camera sensor 5 and receive.On the other hand, the light L3a of light source 2a side is reflected by concavo-convex wall H1 at region c, and this reflected light also injects lens 4.In addition, the light L3b of light source 2b side is also reflected by concavo-convex wall H2 at region c, and this reflected light injects lens 4 too.That is, when the shape of ridge is normal, the reflected light of region c does not inject lens 4 due to the relation of the incident angle of light, but when ridge exists be not supposed to concavo-convex time this concavo-convex wall reflected light inject lens 4.This is feature of the present invention.
And, in the present invention, the radiating light of light source 2a can be utilized to irradiate concavo-convex wall H1, utilize the radiating light of light source 2b to irradiate concavo-convex wall H2.Like this two light sources are configured on the contrary direction centered by check object, the reflected light of wall H1 and wall H2 can be detected, result simultaneously, concaveconvex shape can be detected more accurately.If further illustrate, namely due to screw thread rotation, therefore when concavo-convex be positioned at region a, region b time perhaps what can to identify by reflected light abnormal, but owing to being irradiate concavo-convex from a direction, therefore can not identify concavo-convex as shown in Figure 6 exactly.
Fig. 5 represents the light-receiving state of image sensor 5 (area sensor).Represent certain the flashy state of the screw thread rotated.Fig. 5 (a) is corresponding with Fig. 3, and represent the normal situation of shape of ridge, Fig. 5 (b) is corresponding with Fig. 4, represents the concavo-convex situation being formed with in a part for ridge and not being supposed to.
In Fig. 5 (a), image sensor 5 receives the reflected light at region a of light source 2a and the reflected light at region b of light source 2b, but does not receive the reflected light from region c.Therefore, the image of the why sample of the region corresponding to the c of None-identified region.On the other hand, in Fig. 5 (b), image sensor 5 receives the reflected light at region a of light source 2a and the reflected light at region b of light source 2b, the in addition reflected light from concavo-convex wall of receiving area c in the same manner as (a) of Fig. 5.
Like this, the present invention by receiving light by image sensor 5, detect reflected light from region, thus the concavo-convex of ridge can be detected.
Light source 2 radiates visible light, such as, adopt LED.In addition, in fig. 1 and 2, preferred light source 2a and light source 2b radiates the mutually different light of wavelength (light of different colours).Such as, light source 2a adopts the LED of radiation red light, and light source 2b adopts the LED of radiation blue light.Its advantage is, concavo-convex for one, and the wall reflecting the light of a side light source can carry out detected image respectively by difference deep or light, color characteristics with the wall of the light of reflection opposite side light source, thus can determine this concavo-convex face shaping further clearly.Such as, when Fig. 5 (b), when identifying red image G1 and blue image G2, part that is red and blue combination be one concavo-convex, also can carry out concavo-convex difference from direction that is red and blueness.In addition, the part connected by envelope of above-mentioned image can judge concavo-convex size.And, also can distinguish with being close to occur concavo-convex.But suppose that light source 2a is identical with light source 2b, then image G1 and image G2 is identified as same pattern, and the image G3 be present near it is identified as same pattern too, thus is difficult to determine by which type of image combining and formed concavo-convex.Thus, feature of the present invention is also, irradiates the light (light of different colours) of different wave length from contrary direction respectively.
Preferred image sensor is can CCD (Charge CoupledDevice: the charge-coupled image sensor) video camera of color image shot.In addition, distance, the focus between ridge can be adjusted by adjustment lens.And, in the above-described embodiments, employing area sensor is illustrated as image sensor, but also can adopts line sensor (Line Sensor).In this case, only using region c as light area, adopt line sensor can obtain same action effect.
Diffuser plate is such as made up of acrylic resin board etc.Screw thread can be irradiated from all directions by making the irradiation light diffusion to screw thread.Thereby, it is possible to detect concavo-convex further accurately.
In the above-described embodiments, light source 2 and the fixing and situation simultaneously can irradiating full stand of thread of diffuser plate 3 are illustrated, but, such as when the situation etc. that the total length of screw thread is longer, also light source 2 and diffuser plate 3 can be made to move to the total length direction of screw thread integratedly, irradiate thread outer surface along with moving.
In addition, the present invention for convenience of explanation, extremely simulated experimentization has showed above-mentioned Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5.Therefore, the optically not necessarily correct description of the angle of incident angle, reflection angle etc. or direction.In addition, screw thread also only shows the part of ridge, thread groove, but in fact there is head, the body portion of screw thread.
Claims (2)
1. a testing fixture for ridge, has:
Light source portion, its local, region to the outside surface of the screw thread rotated and irradiate screw thread whole side face continuously;
Lens and image sensor, it receives the reflected light from screw thread; And
Image processing part, it identifies the shape of ridge according to the rotation information of screw thread and shooting information, it is characterized in that,
Above-mentioned light source portion is formed with two, is made up of respectively light source and diffuser plate,
Above-mentioned light source portion is line balanced configuration across connecting the imaginary line of above-mentioned screw thread, said lens and above-mentioned image sensor,
Above-mentioned light source portion and above-mentioned image sensor are configured to be in the height identical with described imaginary line on the direction of the turning axle of described screw thread,
Above-mentioned image sensor is the above-mentioned reflected light of nonrecognition when ridge shape is normal, only when ridge exist be not supposed to concavo-convex, at least the region that can receive this concavo-convex reflected light caused is observed.
2. the testing fixture of ridge as claimed in claim 1, is characterized in that,
The radiation wavelength of above-mentioned light source portion is different.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010006373A JP5471477B2 (en) | 2010-01-15 | 2010-01-15 | Thread inspection equipment |
| JP2010-006373 | 2010-01-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102128598A CN102128598A (en) | 2011-07-20 |
| CN102128598B true CN102128598B (en) | 2015-05-20 |
Family
ID=44266780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010593035.2A Expired - Fee Related CN102128598B (en) | 2010-01-15 | 2010-12-14 | Checking device for thread |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5471477B2 (en) |
| KR (1) | KR20110084093A (en) |
| CN (1) | CN102128598B (en) |
| TW (1) | TW201128163A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9897437B2 (en) * | 2011-11-30 | 2018-02-20 | Nikon Corporation | Profile measuring apparatus, structure manufacturing system, method for measuring profile, method for manufacturing structure, and non-transitory computer readable medium |
| KR101327276B1 (en) * | 2012-06-28 | 2013-11-08 | 주식회사 서울금속 | Vision inspection apparatus using collimated light defining thin plane |
| CN104122265B (en) * | 2013-04-28 | 2016-12-28 | 郑州大学 | Panel beating screw hole screw thread disappearance inspection method and system thereof |
| CN104567722B (en) * | 2015-01-23 | 2017-03-15 | 成都实唯物联网科技有限公司 | A kind of female thread detection method |
| JP6509146B2 (en) * | 2016-02-24 | 2019-05-08 | 株式会社豊田中央研究所 | Inspection apparatus and inspection method |
| JP2017166941A (en) * | 2016-03-16 | 2017-09-21 | 日立金属株式会社 | Screw inspection apparatus and method for inspecting screw using the same |
| JP6599829B2 (en) * | 2016-09-01 | 2019-10-30 | 富士フイルム株式会社 | Inspection apparatus and method |
| DE102017126198B4 (en) * | 2017-11-09 | 2021-11-11 | Carl Zeiss Industrielle Messtechnik Gmbh | Method and system for gaugeless measurement of a thread |
| CN108039647B (en) * | 2017-12-01 | 2019-08-16 | 湖北文理学院 | Spark-plug thread detection device and method |
| CN110849279B (en) * | 2019-11-27 | 2021-05-25 | 陕西理工大学 | Compensation method for measuring pitch diameter of thread by machine vision |
| CN111397527A (en) * | 2020-03-25 | 2020-07-10 | 西安理工大学 | Thread profile image acquisition device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1424576A (en) * | 2001-12-04 | 2003-06-18 | 株式会社拓普康 | Surface testers |
| CN101443649A (en) * | 2006-05-15 | 2009-05-27 | 株式会社尼康 | Surface inspection device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6176941A (en) * | 1984-09-21 | 1986-04-19 | Nippon Denso Co Ltd | Method and device for inspecting appearance failure of screw |
| JPH07104290B2 (en) * | 1989-03-29 | 1995-11-13 | 日本電気株式会社 | Bottle inspection equipment |
| JPH0462406A (en) * | 1990-06-29 | 1992-02-27 | Ntn Corp | Method and device for inspecting surface state of bearing |
| JP2007285983A (en) * | 2006-04-20 | 2007-11-01 | Honda Motor Co Ltd | Method and device for detecting damage or the like of workpiece |
-
2010
- 2010-01-15 JP JP2010006373A patent/JP5471477B2/en not_active Expired - Fee Related
- 2010-11-11 TW TW099138839A patent/TW201128163A/en unknown
- 2010-12-07 KR KR1020100124142A patent/KR20110084093A/en not_active Application Discontinuation
- 2010-12-14 CN CN201010593035.2A patent/CN102128598B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1424576A (en) * | 2001-12-04 | 2003-06-18 | 株式会社拓普康 | Surface testers |
| CN101443649A (en) * | 2006-05-15 | 2009-05-27 | 株式会社尼康 | Surface inspection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5471477B2 (en) | 2014-04-16 |
| KR20110084093A (en) | 2011-07-21 |
| TW201128163A (en) | 2011-08-16 |
| JP2011145182A (en) | 2011-07-28 |
| CN102128598A (en) | 2011-07-20 |
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