EP0787278A1 - Outil pour le controle d'un filetage, permettant de mesurer le diametre sur flancs et d'effectuer un controle visuel du pas et du profil du filetage - Google Patents

Outil pour le controle d'un filetage, permettant de mesurer le diametre sur flancs et d'effectuer un controle visuel du pas et du profil du filetage

Info

Publication number
EP0787278A1
EP0787278A1 EP95933350A EP95933350A EP0787278A1 EP 0787278 A1 EP0787278 A1 EP 0787278A1 EP 95933350 A EP95933350 A EP 95933350A EP 95933350 A EP95933350 A EP 95933350A EP 0787278 A1 EP0787278 A1 EP 0787278A1
Authority
EP
European Patent Office
Prior art keywords
thread
profile
blades
thread profile
blade
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.)
Withdrawn
Application number
EP95933350A
Other languages
German (de)
English (en)
Inventor
Frank Juhl Nielsen
Gordon Clarke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pro-Tech International AS
Original Assignee
Pro-Tech International AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DK120494A external-priority patent/DK170479B1/da
Application filed by Pro-Tech International AS filed Critical Pro-Tech International AS
Publication of EP0787278A1 publication Critical patent/EP0787278A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/46—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable
    • G01B3/48—Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable for internal screw-threads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/38—Gauges with an open yoke and opposed faces, i.e. calipers, in which the internal distance between the faces is fixed, although it may be preadjustable
    • G01B3/40—Gauges with an open yoke and opposed faces, i.e. calipers, in which the internal distance between the faces is fixed, although it may be preadjustable for external screw-threads

Definitions

  • the present invention relates to a thread inspection tool of the type, in which a sliding caliper is provided with holders, in which thread profile blades may be mounted, the holders being fastened to the jaws of the sliding caliper, and in which the thread profile blades, one of which having at least two thread profiles, may be brought into mutual contact.
  • Thread plug gauges i.e. thread plug gauges, thread ring gages and thread calipers only check if the thread is right or wrong, and with these instruments there is some uncertainty as to the scope of wear on the inspection tool after use. Moreover, it is only possible to use these instruments for one specific diameter and tolerance. Thread wires and thread inserts (both primarily for external micrometer screws) check first and foremost only pitch diameter and assume correct pitch and profile. Adjustable inspection and measuring tools require a calibration "master", and common for all these methods is a very difficult and/or expensive calibration.
  • US-A-4,611,404 discloses a thread inspection tool which is based on a conventional caliper, onto the jaws of which a pair of arms is attached. These arms are provided with holders for thread profile blades which have in advance been calibrated such that the readout of the caliper corresponds to the external diameter of the thread.
  • a drawback of this instrument is that the calibration cannot be performed without the use of additional equipment in form of calibration masters.
  • the instrument is adjustable from measurement of external threads to measurement of internal threads, but the adjustment requires change of both arms and profile blades. Due to the shape of the arms only large, internal threads can be measured.
  • the object of the invention is to eliminate the drawbacks described above.
  • the thread inspection tool according to the invention is characteristic by the subject matter of the characterizing clause of claim 1.
  • a combination of holders which allow the profile blades to be pushed together for check of the correct insertion for calibration of the tool, and a caliper of the zero positionable type is used.
  • the two profile blades are pushed together, whereby it becomes possible firstly to visually ascertain the condition of the profile blades, and secondly a reference is obtained which at the zero positioning of the caliper makes it possible directly at the subsequent measurements to read the pitch diameter of the thread in question.
  • the plane of the profile blades extends perpendicularly to a plane through the jaws of the caliper. This embodiment makes it possible to measure threads which are longer than the jaws of the caliper and to measure external threads, while the workpiece is held by a tailstock centre in a machine.
  • the thread inspection tool For measurement of internal threads the thread inspection tool according to the invention is provided with profile blades which comprise rear edges extending parallel with the thread profile, said rear edges being positioned in such a way relative to the guide lugs that the thread profile blades after mounting may be brought into mutual contact along the rear edges.
  • the mutual contact between the rear edges of profile blades is used for control of the mounting of the blades and their condition as well as for calibration of the tool.
  • a measured value has, however, to be added to the readout measurement, which measured value is characteristic for the profile blades in question. This measured value may, however, be found by means of the zero positionable caliper before the profile blades are mounted.
  • the thread measurements which are performed with the tool according to the invention get a higher degree of accuracy the thinner the profile blades.
  • the second groove is adapted to hold strengthening blades too which substantially follow the contour of the profile blade, and in such a way that the strengthening blade is shortened such that the thread profile of the profile blade itself is free of the strengthening blade, when the strengthening blade is abutting the profile blade.
  • the strengthening blades it is possible to reduce the thickness of the profile blades to a few tenths mm, which reduces the influence of the thread pitch on the measurement to such a degree that it may be disregarded in practice.
  • the profile blade obtains a rigidity which is sufficient, without any risk of damaging the profile blade, for the tool to be used under normal conditions in a workshop.
  • At least one strengthening blade is permanently fastened to the thread profile blade.
  • the strengthening blades are permanently fastened to the profile blade, for instance by soldering or glueing, a lamination effect is obtained which impart to the profile blade an even bigger resistance than is the case with detachable blades towards pushing and pulling, when the profile blades are used for measuring and checking.
  • the guide lug is staggered by one quarter of the pitch from the centre line.
  • Fig. 1 shows an electronic sliding caliper with modified jaws as well as the modified jaws enlarged and equipped with the profile blades or the blades ready for being mounted,
  • Fig. 2 shows different views of a profile blade holder mounted on the fixed jaw of a caliper
  • Fig. 3 shows a set of profile blades which have been brought in contact during zero positioning of the caliper
  • Fig. 4 shows thread profile blades during measurement and control of an external thread
  • Fig. 5 shows thread profile blades for internal threads during measuring of the characteristic measured value
  • Fig. 6 shows a set internal profile blades which have been brought in position for zero positioning of the caliper
  • Fig. 7 shows thread profile blades for internal threads during measuring of the thread
  • Fig. 8 shows a thread profile blade provided with strengthening blades
  • Fig. 9 shows a thread profile blade for measuring external threads, and in which two identical blades may form a pair.
  • Fig. 1 shows an electronic digital caliper 1 with a profile blade holder 2 fastened to the fixed jaw 7 and a profile blade holder 3 fastened to the movable jaw 8.
  • the enlarged figure shows the two jaws 7,8 with holders 2,3, in which a pair of profile blades 4 for measurement of external threads has been mounted.
  • a pair of thread profile blades 5 for measuring internal threads is shown as well as a pair of fastening screws for fastening the thread profile blades in the grooves in the bottom of the profile blade holders 2,3.
  • Fig. 2 shows the fixed jaw 1 of a caliper with a profile blade holder 2 mounted for instance by soldering or glueing to the jaw.
  • the profile blade holder on the movable jaw is designed in the same way, but is laterally reversed.
  • the holder comprises a block 2 which partly serves as strengthener, partly prevents foreign particles from penetrating into the fastening groove, in which the jaw is held.
  • a groove is provided for receiving the guide lug of the profile blades.
  • the grooves in the two holders have to be machined in such a way that the profile blades which are inserted in the two blocks align, i.e. are parallel with and equidistant from the beam of the caliper.
  • the fastening means 9 is for fastening the block to the jaw and the fastening means 6 is for fastening the thread profile blade in the groove.
  • Fig. 3 shows how a set of external thread profile blades 4,4' should touch for check of correct mounting and the positioning for calibration, by means of which the caliper is zero positioned.
  • the figure shows the guide lugs of the profile blades, said guide lugs being the part of the profile blade which is fastened in and guided by the groove in the bottom of the profile blade holder 3.
  • the measuring of an external thread is shown in Fig. 4.
  • the two external thread profile blades 4,4' are brought in contact with the thread at opposide sides.
  • the measurement result will be equal to the pitch diameter of the thread.
  • Fig. 5 shows the position of a pair of unattached thread profile blades 5,5' for measurement of the characteristic dimension K.
  • the measurement result K is noted for later use in connection with measuring of internal threads.
  • the profile blades are mounted in the holders which are brought together to the position shown in Fig. 6, in which the caliper is zero positioned when it has been checked that the two profile blades abut one another and consequently are correctly mounted.
  • the thread profile, the guide lug and the groove in the bottom of the holder have to be designed in such a way that a centre line (shown as a dotted line) intersects one profile blade through a thread crest and the other through a thread root. This is the requirement for a theoretically correct touching when measuring a thread.
  • Fig. 7 shows how the thread profile blades 5,5' mounted on the holders should touch when measuring an internal thread.
  • the profile blades are inserted in the thread in a plane parallel with the axis of the thread.
  • the pitch of the thread thereby extends obliquely relative to the edges of the profile blades. It is therefore desirable in respect of the accuracy of the measurement that the profile blades are as thin as possible.
  • the profile blades may therefore be equipped with strengthening blades, the contour of which substantially corresponds to that of the profile blade apart from the fact that the strengthening blade is somewhat shorter than the profile blade, the contour of the profile blade protruding over the contour of the strengthening blade.
  • the profile blade shown in Fig. 9 for measurement of an external thread is characteristic in that the symmetry axis of the guide lug is staggered by one quarter relative to a centre line for the thread profile.
  • the centre lines for the thread profile run through the tooth tips of the profile.
  • two identical profile blades may be used as a set, one of the blades being merely turned a half round about the axis of the guide lug.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

Outil pour le contrôle d'un filetage, du type dans lequel un pied à coulisse est pourvu de supports aptes à porter des lames profilées, et fixés aux branches du pied à coulisse, et les lames profilées, dont l'une présente au moins deux profils de filetage, peuvent venir au contact l'une de l'autre. Afin d'obtenir un outil que l'on peut étalonner sans utiliser de matériel supplémentaire, et dont on peut contrôler instantanément la fiabilité de mesure, ledit outil de contrôle est caractérisé en ce que le pied à coulisse est du type à position zéro, en ce que les lames profilées sont adaptées pour mesurer le diamètre sur flancs et pour permettre un contrôle et une évaluation visuels du profil du filetage, et en ce que les supports comportent deux rainures perpendiculaires l'une à l'autre, l'une des rainures étant adaptée pour accueillir l'une des branches du pied à coulisse, et pour être maintenue par celle-ci, tandis que la seconde rainure, pourvue d'un trou taraudé permettant le maintien d'une vis de fixation des lames profilées, est usinée selon une profondeur et une largeur telles qu'elle peut retenir le tenon de guidage d'une lame profilée, les rainures pour les tenons de guidage étant orientées l'une par rapport à l'autre de telle sorte que lorsque deux lames profilées sont placées dans leurs rainures respectives, elles sont contenues dans un même plan parallèle au manche du pied à coulisse, et de telle sorte qu'une ligne médiane commune aux profils de filetage croise le sommet du filet sur l'une des lames profilées, et le fond du filet sur l'autre lame profilée.
EP95933350A 1994-10-18 1995-10-16 Outil pour le controle d'un filetage, permettant de mesurer le diametre sur flancs et d'effectuer un controle visuel du pas et du profil du filetage Withdrawn EP0787278A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DK120494A DK170479B1 (da) 1994-10-18 1994-10-18 Gevindkontrolværktøj til måling af delediameter samt visuel kontrol/vurdering af gevindstigning og -profil
DK53195 1995-05-08
DK1204/94 1995-05-08
DK531/95 1995-05-08
PCT/DK1995/000413 WO1996012158A1 (fr) 1994-10-18 1995-10-16 Outil pour le controle d'un filetage, permettant de mesurer le diametre sur flancs et d'effectuer un controle visuel du pas et du profil du filetage

Publications (1)

Publication Number Publication Date
EP0787278A1 true EP0787278A1 (fr) 1997-08-06

Family

ID=26064167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95933350A Withdrawn EP0787278A1 (fr) 1994-10-18 1995-10-16 Outil pour le controle d'un filetage, permettant de mesurer le diametre sur flancs et d'effectuer un controle visuel du pas et du profil du filetage

Country Status (4)

Country Link
EP (1) EP0787278A1 (fr)
JP (1) JPH10508691A (fr)
AU (1) AU3605795A (fr)
WO (1) WO1996012158A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109855514A (zh) * 2018-12-27 2019-06-07 中国航发哈尔滨轴承有限公司 一种角接触球轴承双半内圈沟曲率的测量方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004317271A (ja) * 2003-04-16 2004-11-11 Masami Fuse Ｐｃｄ測定ゲージ
JP2008185358A (ja) * 2007-01-26 2008-08-14 Nippon Steel & Sumikin Metal Products Co Ltd 平坦度測定具
JP2016080638A (ja) * 2014-10-22 2016-05-16 株式会社日本製鋼所 スクリュ外径測定装置及び方法
FR3030716B1 (fr) * 2014-12-22 2018-10-26 Tri Qualite Service Dispositif et methode de controle d'un element filete exterieurement
CN105066936B (zh) * 2015-07-31 2018-05-04 重庆华瑞标准件制造有限公司 矩形牙螺钉中径的快速测量装置及其使用方法
GB2561366B (en) * 2017-04-11 2021-09-29 Bentley Motors Ltd Gap measuring device and system
JP7311089B2 (ja) * 2019-12-16 2023-07-19 株式会社全晴 隙間測定器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2634045A1 (de) * 1976-07-29 1978-02-02 Herbert Hess Gewindemessgeraet
US4611404A (en) * 1983-12-29 1986-09-16 Arsenault Ronald G Caliper for thread measurement
DE3811202C1 (fr) * 1988-04-01 1989-05-03 Carl Mahr Gmbh & Co, 7300 Esslingen, De
US5276971A (en) * 1993-03-01 1994-01-11 Brewster Albert L Thread gauge for tapered threads

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9612158A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109855514A (zh) * 2018-12-27 2019-06-07 中国航发哈尔滨轴承有限公司 一种角接触球轴承双半内圈沟曲率的测量方法

Also Published As

Publication number Publication date
AU3605795A (en) 1996-05-06
WO1996012158A1 (fr) 1996-04-25
JPH10508691A (ja) 1998-08-25

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