CN103090755A - Trapezoid screw snap gauge and detecting method for detecting pitch diameter of thread - Google Patents
Trapezoid screw snap gauge and detecting method for detecting pitch diameter of thread Download PDFInfo
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- CN103090755A CN103090755A CN2013100394916A CN201310039491A CN103090755A CN 103090755 A CN103090755 A CN 103090755A CN 2013100394916 A CN2013100394916 A CN 2013100394916A CN 201310039491 A CN201310039491 A CN 201310039491A CN 103090755 A CN103090755 A CN 103090755A
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Abstract
The invention provides a trapezoid screw snap gauge and a detecting method for detecting the pitch diameter of a thread. The trapezoid screw snap gauge comprises a first snap-gauge and a second snap-gauge which are in a thin sheet shape. The first snap-gauge and the second snap-gauge are respectively provided with a plurality of trapezoid teeth with thread pitches and tread angles being the same with the thread pitch of a to-be-detected trapezoid thread, and a trapezoid groove is formed between two adjacent trapezoid teeth. A circumference is taken in the large diameter tolerance range of the to-be-detected trapezoid thread to be used as a reference line, when the pitch diameter of the to-be-detected trapezoid thread is in a maximum tolerance value, the maximum width value between two intersection points of the reference line and the tooth-shaped bevel edge of the to-be-detected trapezoid thread is the width of the groove bottom of the trapezoid groove of the first snap-gauge; and when the pitch diameter of the to-be-detected thread is in a minimum tolerance value, the minimum width value between the two intersection points of the reference line and the extension line of the tooth-shaped bevel edge of the to-be-detected trapezoid thread is the width of the groove bottom of the trapezoid groove of the second snap-gauge.
Description
Technical field
The present invention relates to a kind of dimension detection tool and detection method of the pitch diameter of thread, especially relate to a kind of acme thread calliper and for detection of the detection method of the central diameter of acme thread.
Background technology
Acme thread generally is divided into the metric system (tooth form angle be 30 °) and trapezoidal love gram box thread made in U.S.A (tooth form angle be 29 °), tooth form is isosceles trapezoid, is mainly used in transmission, is fastenedly connected and adjusts with the position.
Acme thread is adding man-hour, needs double thread large footpath, central diameter, path, pitch, tooth form angle, thread height etc. to detect.Wherein, the detection for pitch, tooth form angle can detect by the standard thread model; And for the detection of middle diameter of metric trapezoidal screw, mainly complete by external thread gauge (feeler gauge or ring gauge), yet for large-sized acme thread workpiece, need to use the external thread gauge of wide range to detect, it is very inconvenient to operate, and detects loaded down with trivial details.And the price of feeler gauge or ring gauge is higher, has improved testing cost.
Summary of the invention
In view of this, first purpose of the present invention be to provide a kind of simple in structure, processing cost is lower, the dimension detection tool of the middle diameter of metric trapezoidal screw of handled easily.
In order to achieve the above object, the invention provides a kind of acme thread calliper, it is for detection of the central diameter of acme thread to be measured, it is characterized in that, it comprises laminal the first clamp and the second clamp, have respectively the pitch a plurality of and described acme thread to be measured stepped tooth identical with the tooth form angle on described the first clamp and the second clamp, form dovetail groove between adjacent two stepped tooths, wherein:
Get a circumference as datum line in the margin tolerance of the large footpath of described acme thread to be measured, when the central diameter of described screw thread to be measured was the tolerance maximal value, the distance between two intersection points that the tooth form hypotenuse of described datum line and described acme thread to be measured intersects was the bottom land width of the dovetail groove of described the first clamp; When the central diameter of described screw thread to be measured was the tolerance minimum value, the distance between two intersection points that the extended line of the tooth form hypotenuse of described datum line and described acme thread to be measured intersects was the bottom land width of the dovetail groove of described the second clamp.
Preferably, the diameter dimension of described datum line is near the upper limit of the large footpath margin tolerance of described acme thread to be measured.
Preferably, the stepped tooth height of described the first clamp is less than or equal to the thread height of described acme thread to be measured.
Preferably, the stepped tooth height of described the second clamp is less than or equal to the thread height of described acme thread to be measured.
Preferably, also has respectively the shank that supplies hand-held on described the first clamp, described the second clamp.
Because the longitudinal section of acme thread is an isosceles trapezoid, to fix due to the tooth form angle, the central diameter circumference is definite value to the distance on trapezoidal upper base, central diameter is set as definite value, can calculate the width (crest is wide) on base on isosceles trapezoid by function.Based on such principle, be technological datum (upper topside that is isosceles trapezoid is fixed to the distance of central diameter circumference) by setting footpath, screw thread top circumference, by measuring the width of crest, can indirectly draw the size of central diameter.And acme thread calliper of the present invention is determined the bottom land width of the dovetail groove of the first clamp and the second clamp according to the dimensional tolerence of acme thread to be measured, with the crest width of the bottom land width of the dovetail groove of the first clamp and the second clamp and acme thread to be measured relatively, judge the crest width whether in dimensional tolerance range, thereby the central diameter of indirectly judging acme thread to be measured is whether in dimensional tolerance range.
Another object of the present invention is to provide and a kind ofly adopts above-mentioned acme thread calliper for detection of the detection method of the pitch diameter of thread, it is characterized in that, comprises the following steps:
(1) the tolerance upper limit detects: described the first clamp is snapped on acme thread to be measured, and light the pressure makes described the first clamp be meshed with the tooth form of described acme thread to be measured to be adjacent to, take an end of described the first clamp and described acme thread to be measured engagement place as rotating shaft, the other end of described the first clamp of horizontal hunting.
(2) lower variation of tolerance detects: described the second clamp is snapped on described acme thread to be measured, and light the pressure makes described the second clamp be meshed with the tooth form of described acme thread to be measured to be adjacent to, take an end of described the second clamp and described acme thread to be measured engagement place as rotating shaft, the other end of described the first clamp of horizontal hunting.
Preferably, described the first clamp or described the second clamp axially vertically snapping on described acme thread to be measured along described acme thread to be measured.
Preferably, in step (1), along the other end of direction horizontal hunting described first clamp opposite with thread rotary orientation.
Preferably, in step (2), along the other end of direction horizontal hunting described second clamp opposite with thread rotary orientation.
When carrying out the detection of the tolerance upper limit, when the bottom land of the dovetail groove of the first clamp during with complete seamless contact of the crest of acme thread to be measured, take an end of described the first clamp and described acme thread to be measured engagement place as rotating shaft, other end certain distance that can described the first clamp of horizontal hunting, show the crest width of acme thread to be measured less than the bottom land width of the dovetail groove of the first clamp, thereby the central diameter of judging acme thread to be measured is less than the tolerance upper limit.When there is the gap in the crest of the bottom land of the dovetail groove of the first clamp and acme thread to be measured, the other end that can't described the first clamp of horizontal hunting, show the crest width of acme thread to be measured greater than the bottom land width of the dovetail groove of the first clamp, thereby the central diameter of judging acme thread to be measured is greater than the tolerance upper limit.
When carrying out the lower variation of tolerance detection, when the bottom land of the dovetail groove of the second clamp during with complete seamless contact of the crest of acme thread to be measured, take an end of described the second clamp and described acme thread to be measured engagement place as rotating shaft, other end certain distance that can described the second clamp of horizontal hunting, show the crest width of acme thread to be measured less than the bottom land width of the dovetail groove of the second clamp, thereby the central diameter of judging acme thread to be measured is less than lower variation of tolerance.When there is the gap in the crest of the bottom land of the dovetail groove of the second clamp and acme thread to be measured, the other end that can't described the second clamp of horizontal hunting, show the crest width of acme thread to be measured greater than the bottom land width of the dovetail groove of the second clamp, thereby the central diameter of judging acme thread to be measured is greater than lower variation of tolerance.
Only have the central diameter of acme thread to be measured to satisfy simultaneously when reaching greater than lower variation of tolerance less than the tolerance upper limit, the central diameter size of acme thread to be measured just meets size tolerance requirements.
After adopting acme thread calliper of the present invention to detect intuitively, the central diameter of acme thread to be measured can judge fast that acme thread to be measured meets the central diameter size tolerance requirements of processing during not only less than the tolerance upper limit but also greater than lower variation of tolerance.
Compared to prior art, acme thread calliper provided by the invention is simple in structure, lightweight, easy to operate, whether the central diameter that can test quickly and intuitively acme thread to be measured meets size tolerance requirements, and trapezoidal bolt calliper low processing cost provided by the invention, greatly reduce the testing cost of large scale acme thread.The detection method step of middle diameter of metric trapezoidal screw provided by the invention is simple, operation is simple and easy, testing result directly perceived, easily grasp.
Description of drawings
Fig. 1 is the structural representation of the first clamp of acme thread calliper of the present invention.
Fig. 2 is the enlarged drawing of local K in Fig. 1.
Fig. 3 is the trapezoidal externally threaded drawing of tolerance range of ACME made in U.S.A.
Fig. 4 is the schematic top plan view that the first clamp of acme thread calliper of the present invention uses state.
Fig. 5 is the schematic perspective view that the first clamp of acme thread calliper of the present invention uses state.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is elaborated.
See also Fig. 1 to Fig. 5, the invention provides a kind of acme thread calliper, it is for detection of the central diameter of acme thread 100 to be measured, and it comprises laminal the first clamp 10 and the second clamp (not shown).Has the shank 11 for hand-held on described the first clamp.
The pitch stepped tooth 12 identical with the tooth form angle that has respectively a plurality of and described acme thread 100 to be measured on described the first clamp and described the second clamp forms dovetail groove 13 between adjacent two stepped tooths 12.The profile of described the second clamp is identical with the profile of described the first clamp, and difference only is that the bottom land width of dovetail groove is different.
In the present embodiment, acme thread to be measured is ACME acme thread made in U.S.A, and its tooth form angle is 29 °.
See also Fig. 2 and Fig. 3, described the first card 10 is determined in the following manner with the bottom land width of the dovetail groove of described the second clamp: get a circumference as datum line L in the margin tolerance of the large footpath of described acme thread 100 to be measured, when the central diameter of described screw thread to be measured 100 was tolerance maximal value D, the distance A between two intersection points that the tooth form hypotenuse of described datum line L and described acme thread to be measured 100 intersects was the bottom land width B of the dovetail groove 13 of described the first clamp 10
1When the central diameter of described screw thread to be measured 100 was tolerance minimum value d, between two intersection points that the extended line of the tooth form hypotenuse of described datum line L and described acme thread to be measured 100 intersects was the bottom land width B of the dovetail groove of described the second clamp apart from a
2
The diameter dimension of described datum line L is near the upper limit of the large footpath margin tolerance of described acme thread to be measured.
The stepped tooth 12 of described the first clamp 10 highly is less than or equal to the thread height of described acme thread to be measured.The stepped tooth height of described the second clamp is less than or equal to the thread height of described acme thread to be measured.
See also Fig. 4 and Fig. 5, adopt above-mentioned acme thread calliper for detection of the detection method of middle diameter of metric trapezoidal screw, comprise the following steps:
(1) the tolerance upper limit detects: with described the first clamp 10 axially vertically snapping on acme thread 100 to be measured along described acme thread 100 to be measured, and light the pressure makes described the first clamp 10 be meshed with the tooth form of described acme thread 100 to be measured to be adjacent to, take an end of described the first clamp 10 and described acme thread to be measured 100 engagement places as rotating shaft, along the other end of direction (in the figure direction of torsion F) horizontal hunting described first clamp 10 opposite with thread rotary orientation.
(2) lower variation of tolerance detects: described the second clamp is snapped on described acme thread to be measured, and light the pressure makes described the second clamp be meshed with the tooth form of described acme thread to be measured to be adjacent to, take an end of described the second clamp and described acme thread to be measured engagement place as rotating shaft, along the other end of direction horizontal hunting described first clamp opposite with thread rotary orientation.
When complete seamless contact of bottom land of the crest of described acme thread 100 to be measured and the dovetail groove 13 of described the first clamp 10, take an end of described the first clamp 10 and described acme thread to be measured 100 engagement places as rotating shaft, other end certain distance m that can described the first clamp of horizontal hunting shows that the crest width of acme thread 100 to be measured is less than the bottom land width B of the dovetail groove 13 of the first clamp 10
1Thereby, judge that the central diameter of acme thread 100 to be measured is less than the tolerance upper limit.Under the prerequisite of the central diameter of acme thread 100 to be measured less than the tolerance upper limit, just use the second clamp that it is detected.When there was the gap in the crest of the bottom land of the dovetail groove of the second clamp and acme thread to be measured 100, the other end that can't described the second clamp of horizontal hunting showed that the crest width of acme thread to be measured is greater than the bottom land width B of the dovetail groove of the second clamp
2Thereby, judge that the central diameter of acme thread 100 to be measured is greater than lower variation of tolerance.
When the central diameter of described acme thread to be measured satisfied not only less than the tolerance upper limit but also greater than lower variation of tolerance simultaneously, its central diameter size just met the machining tolerance requirement.
With respect to prior art, acme thread calliper provided by the invention has the following advantages: (1) is simple in structure, and is lightweight, easy to operate; (2) in process of manufacture, can effectively control pitch, tooth form angle, tooth side angle, improve thread quality; (3) can realize one card for multiple uses: left-handed, the right-hand thread of same size, can use the screw thread gage of same specification; Pitch is equated the large nearer screw thread of footpath size can replace using; To the internal thread of identical pitch, can use same set of screw thread gage.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics; its purpose is to allow person skilled in the art scholar can understand content of the present invention and implement according to this; can not limit protection scope of the present invention with this; all equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (9)
1. acme thread calliper, it is for detection of the central diameter of acme thread to be measured, it is characterized in that, it comprises laminal the first clamp and the second clamp, have respectively the pitch a plurality of and described acme thread to be measured stepped tooth identical with the tooth form angle on described the first clamp and the second clamp, form dovetail groove between adjacent two stepped tooths, wherein:
Get a circumference as datum line in the margin tolerance of the large footpath of described acme thread to be measured, when the central diameter of described screw thread to be measured was the tolerance maximal value, the distance between two intersection points that the tooth form hypotenuse of described datum line and described acme thread to be measured intersects was the bottom land width of the dovetail groove of described the first clamp; When the central diameter of described screw thread to be measured was the tolerance minimum value, the distance between two intersection points that the extended line of the tooth form hypotenuse of described datum line and described acme thread to be measured intersects was the bottom land width of the dovetail groove of described the second clamp.
2. a kind of acme thread calliper according to claim 1, is characterized in that: the upper limit of the large footpath margin tolerance of the close described acme thread to be measured of the diameter dimension of described datum line.
3. a kind of acme thread calliper according to claim 1, it is characterized in that: the stepped tooth height of described the first clamp is less than or equal to the thread height of described acme thread to be measured.
4. a kind of acme thread calliper according to claim 1, it is characterized in that: the stepped tooth height of described the second clamp is less than or equal to the thread height of described acme thread to be measured.
5. a kind of acme thread calliper according to claim 1, is characterized in that: also have respectively the shank for hand-held on described the first clamp, described the second clamp.
6. acme thread calliper claimed in claim 1 for detection of the detection method of the pitch diameter of thread, is characterized in that, comprises the following steps:
(1) the tolerance upper limit detects: described the first clamp is snapped on acme thread to be measured, and light the pressure makes described the first clamp be meshed with the tooth form of described acme thread to be measured to be adjacent to, take an end of described the first clamp and described acme thread to be measured engagement place as rotating shaft, the other end of described the first clamp of horizontal hunting.
(2) lower variation of tolerance detects: described the second clamp is snapped on described acme thread to be measured, and light the pressure makes described the second clamp be meshed with the tooth form of described acme thread to be measured to be adjacent to, take an end of described the second clamp and described acme thread to be measured engagement place as rotating shaft, the other end of described the first clamp of horizontal hunting.
7. detection method claimed in claim 6, it is characterized in that: described the first clamp or described the second clamp axially vertically snap on described acme thread to be measured along described acme thread to be measured.
8. detection method claimed in claim 6, is characterized in that: in step (1), along the other end of direction horizontal hunting described first clamp opposite with thread rotary orientation.
9. detection method claimed in claim 6, is characterized in that: in step (2), along the other end of direction horizontal hunting described second clamp opposite with thread rotary orientation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039491.6A CN103090755B (en) | 2013-02-01 | 2013-02-01 | Trapezoid screw snap gauge and detecting method for detecting pitch diameter of thread |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039491.6A CN103090755B (en) | 2013-02-01 | 2013-02-01 | Trapezoid screw snap gauge and detecting method for detecting pitch diameter of thread |
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| CN103090755A true CN103090755A (en) | 2013-05-08 |
| CN103090755B CN103090755B (en) | 2015-01-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423969A (en) * | 2015-11-18 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for measuring geometric parameters of large-diameter thread form |
| CN106197214A (en) * | 2016-07-15 | 2016-12-07 | 武汉船用机械有限责任公司 | A kind of spud leg tooth bar transverse tooth thickness measures frock and measuring method |
| CN110369814A (en) * | 2019-08-07 | 2019-10-25 | 上海电气上重碾磨特装设备有限公司 | A kind of calliper and the method using calliper control screw thread starting point |
| CN111928809A (en) * | 2020-08-03 | 2020-11-13 | 淮安市迈奕机电设备有限公司 | Method for measuring pitch diameter of thread by utilizing threaded roller measuring anvil |
| CN113213274A (en) * | 2021-04-06 | 2021-08-06 | 疏勒如意科技纺织有限公司 | Tail yarn adjusting clamp |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423969A (en) * | 2015-11-18 | 2016-03-23 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for measuring geometric parameters of large-diameter thread form |
| CN106197214A (en) * | 2016-07-15 | 2016-12-07 | 武汉船用机械有限责任公司 | A kind of spud leg tooth bar transverse tooth thickness measures frock and measuring method |
| CN110369814A (en) * | 2019-08-07 | 2019-10-25 | 上海电气上重碾磨特装设备有限公司 | A kind of calliper and the method using calliper control screw thread starting point |
| CN111928809A (en) * | 2020-08-03 | 2020-11-13 | 淮安市迈奕机电设备有限公司 | Method for measuring pitch diameter of thread by utilizing threaded roller measuring anvil |
| CN113213274A (en) * | 2021-04-06 | 2021-08-06 | 疏勒如意科技纺织有限公司 | Tail yarn adjusting clamp |
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|---|---|
| CN103090755B (en) | 2015-01-28 |
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