CN103090755B - 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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- CN103090755B CN103090755B CN201310039491.6A CN201310039491A CN103090755B CN 103090755 B CN103090755 B CN 103090755B CN 201310039491 A CN201310039491 A CN 201310039491A CN 103090755 B CN103090755 B CN 103090755B
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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 the detection method for the central diameter that detects acme thread thereof.
Background technology
Acme thread is generally divided into the metric system (thread form angle is 30 °) and trapezoidal love gram box thread made in U.S.A (thread form angle is 29 °), and tooth form is isosceles trapezoid, is mainly used in transmission, is fastenedly connected with in the adjustment of position.
Acme thread is adding man-hour, needs the large footpath of double thread, central diameter, path, pitch, thread form angle, thread height etc. to detect.Wherein, for the detection of pitch, thread form angle, can be detected by standard thread model; And for the detection of middle diameter of metric trapezoidal screw, come mainly through external thread gauge (feeler gauge or ring gauge), but for large-sized acme thread workpiece, need the external thread gauge using 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, improves testing cost.
Summary of the invention
In view of this, first object of the present invention is to provide that a kind of structure is simple, 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 detecting the central diameter of acme thread to be measured, it is characterized in that, it comprises laminal first clamp and the second clamp, the stepped tooth that described first clamp is identical with thread form angle with the pitch the second clamp respectively with multiple and described acme thread to be measured, forms dovetail groove between adjacent two stepped tooths, wherein:
A circumference is got as datum line in the large footpath margin tolerance of described acme thread to be measured, when the central diameter of described screw thread to be measured is tolerance maximal value, the distance between two intersection points that described datum line is crossing with the tooth form hypotenuse of described acme thread to be measured is the slot bottom width of the dovetail groove of described first clamp; When the central diameter of described screw thread to be measured is tolerance minimum value, the distance between two intersection points that described datum line is crossing with the extended line of the tooth form hypotenuse of described acme thread to be measured is the slot bottom width of the dovetail groove of described 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 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 second clamp is less than or equal to the thread height of described acme thread to be measured.
Preferably, described first clamp, described second clamp also has respectively the shank for hand-held.
Longitudinal section due to acme thread is an isosceles trapezoid, and because thread form angle is fixed, central diameter circumference is definite value to the distance on trapezoidal upper base, and central diameter is set as definite value, can be calculated the width (crest is wide) on base in isosceles trapezoid by function.Based on such principle, being technological datum (namely the upper topside of isosceles trapezoid is fixed to the distance of central diameter circumference) by setting footpath, screw thread top circumference, by measuring the width of crest, indirectly can drawing the size of central diameter.And the slot bottom width of the dovetail groove of the first clamp and the second clamp determined by acme thread calliper of the present invention according to the dimensional tolerence of acme thread to be measured, the slot bottom width of dovetail groove of the first clamp and the second clamp is compared with the crest width of acme thread to be measured, judge crest width whether in dimensional tolerance range, thus indirectly judge that the central diameter of 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 detecting the detection method of the pitch diameter of thread, it is characterized in that, comprises the following steps:
(1) tolerance limit detects: snap on acme thread to be measured by described first clamp, and light pressure makes described first clamp be meshed with the tooth form of described acme thread to be measured is adjacent to, with one end of described first clamp and described acme thread engagement place to be measured for rotating shaft, the other end of the first clamp described in horizontal hunting.
(2) lower variation of tolerance detects: snapped in by described second clamp on described acme thread to be measured, and light pressure makes described second clamp be meshed with the tooth form of described acme thread to be measured is adjacent to, with one end of described second clamp and described acme thread engagement place to be measured for rotating shaft, the other end of the first clamp described in horizontal hunting.
Preferably, described first clamp or described second clamp vertically snap on described acme thread to be measured along the axis of described acme thread to be measured.
Preferably, in step (1), along the other end of the first clamp described in the direction horizontal hunting contrary with thread rotary orientation.
Preferably, in step (2), along the other end of the second clamp described in the direction horizontal hunting contrary with thread rotary orientation.
When carrying out tolerance limit detection, when bottom land and the crest of acme thread to be measured of the dovetail groove of the first clamp complete seamless contact time, with one end of described first clamp and described acme thread engagement place to be measured for rotating shaft, can the other end certain distance of the first clamp described in horizontal hunting, show that the crest width of acme thread to be measured is less than the slot bottom width of the dovetail groove of the first clamp, thus judge that the central diameter of acme thread to be measured is less than tolerance limit.When there is gap in the bottom land of the dovetail groove of the first clamp and the crest of acme thread to be measured, cannot the other end of the first clamp described in horizontal hunting, show that the crest width of acme thread to be measured is greater than the slot bottom width of the dovetail groove of the first clamp, thus judge that the central diameter of acme thread to be measured is greater than tolerance limit.
When carrying out lower variation of tolerance detection, when bottom land and the crest of acme thread to be measured of the dovetail groove of the second clamp complete seamless contact time, with one end of described second clamp and described acme thread engagement place to be measured for rotating shaft, can the other end certain distance of the second clamp described in horizontal hunting, show that the crest width of acme thread to be measured is less than the slot bottom width of the dovetail groove of the second clamp, thus judge that the central diameter of acme thread to be measured is less than lower variation of tolerance.When there is gap in the bottom land of the dovetail groove of the second clamp and the crest of acme thread to be measured, cannot the other end of the second clamp described in horizontal hunting, show that the crest width of acme thread to be measured is greater than the slot bottom width of the dovetail groove of the second clamp, thus judge that the central diameter of acme thread to be measured is greater than lower variation of tolerance.
Only have the central diameter of acme thread to be measured to meet when being less than tolerance limit and being greater than lower variation of tolerance, the central diameter size of acme thread to be measured just meets size tolerance requirements simultaneously.
After adopting acme thread calliper of the present invention to detect intuitively, when the central diameter of acme thread to be measured had not only been less than tolerance limit but also had been greater than lower variation of tolerance, can judge that acme thread to be measured met the central diameter size tolerance requirements of processing fast.
Compared to prior art, acme thread calliper structure provided by the invention is simple, lightweight, easy to operate, whether the central diameter can testing acme thread to be measured quickly and intuitively 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, it is simple and easy to operate, testing result intuitively, is easily grasped.
Accompanying drawing explanation
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 of the first clamp using state of acme thread calliper of the present invention.
Fig. 5 is the schematic perspective view of the first clamp using state of acme thread calliper of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail.
Refer to Fig. 1 to Fig. 5, the invention provides a kind of acme thread calliper, it is for detecting the central diameter of acme thread 100 to be measured, and it comprises laminal first clamp 10 and the second clamp (not shown).Described first clamp has the shank 11 for hand-held.
The stepped tooth 12 that described first clamp is identical with thread form angle with the pitch described second clamp respectively with multiple and described acme thread 100 to be measured, forms dovetail groove 13 between adjacent two stepped tooths 12.The profile of described second clamp is identical with the profile of described first clamp, and difference is only that the slot bottom 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 thread form angle is 29 °.
Refer to Fig. 2 and Fig. 3, described first card 10 is determined in the following manner with the slot bottom width of the dovetail groove of described second clamp: in the large footpath margin tolerance of described acme thread 100 to be measured, get a circumference as datum line L, when the central diameter of described screw thread to be measured 100 is tolerance maximal value D, the distance A between two intersection points that described datum line L is crossing with the tooth form hypotenuse of described acme thread 100 to be measured is the slot bottom width B of the dovetail groove 13 of described first clamp 10
1; When the central diameter of described screw thread to be measured 100 is tolerance minimum value d, the distance a between two intersection points that described datum line L is crossing with the extended line of the tooth form hypotenuse of described acme thread 100 to be measured is the slot bottom width B of the dovetail groove of described second clamp
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 first clamp 10 is highly less than or equal to the thread height of described acme thread to be measured.The stepped tooth height of described second clamp is less than or equal to the thread height of described acme thread to be measured.
Refer to Fig. 4 and Fig. 5, adopting above-mentioned acme thread calliper for detecting the detection method of middle diameter of metric trapezoidal screw, comprising the following steps:
(1) tolerance limit detects: vertically snap on acme thread 100 to be measured by described first clamp 10 along the axis of described acme thread 100 to be measured, and light pressure makes described first clamp 10 be meshed with the tooth form of described acme thread 100 to be measured is adjacent to, with one end of described first clamp 10 and described acme thread 100 engagement place to be measured for rotating shaft, along the other end of the first clamp 10 described in the direction contrary with the thread rotary orientation direction of torsion F (in the figure) horizontal hunting.
(2) lower variation of tolerance detects: snapped in by described second clamp on described acme thread to be measured, and light pressure makes described second clamp be meshed with the tooth form of described acme thread to be measured is adjacent to, with one end of described second clamp and described acme thread engagement place to be measured for rotating shaft, along the other end of the first clamp described in the direction horizontal hunting contrary with thread rotary orientation.
When crest and the bottom land of the dovetail groove 13 of described first clamp 10 of described acme thread 100 to be measured complete seamless contact time, with one end of described first clamp 10 and described acme thread 100 engagement place to be measured for rotating shaft, can the other end certain distance m of the first clamp described in horizontal hunting, show that the crest width of acme thread 100 to be measured is less than the slot bottom width B of the dovetail groove 13 of the first clamp 10
1, thus judge that the central diameter of acme thread 100 to be measured is less than tolerance limit.Under the central diameter of acme thread 100 to be measured is less than the prerequisite of tolerance limit, the second clamp is just used to detect it.When there is gap in the bottom land of the dovetail groove of the second clamp and the crest of acme thread to be measured 100, cannot the other end of the second clamp described in horizontal hunting, show that the crest width of acme thread to be measured is greater than the slot bottom width B of the dovetail groove of the second clamp
2, thus judge that the central diameter of acme thread 100 to be measured is greater than lower variation of tolerance.
The central diameter of described acme thread to be measured meets when being not only less than tolerance limit but also being greater than lower variation of tolerance simultaneously, and its central diameter size just meets machining tolerance requirement.
Relative to prior art, acme thread calliper provided by the invention has the following advantages: (1) structure is simple, lightweight, easy to operate; (2) in process of manufacture, effectively can control pitch, thread form angle, tooth side angle, improve thread quality; (3) one card for multiple uses can be realized: left-handed, the right-hand thread of same size, can use the screw thread gage of same specification; Equal to pitch, the screw thread that large footpath size is nearer, can replace using; To the internal thread of identical pitch, same set of screw thread gage can be used.
Above-described embodiment is only for illustrating technical conceive of the present invention and feature; its object is to person skilled in the art can be understood content of the present invention and implement according to this; can not limit the scope of the invention with this; all equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (8)
1. an acme thread calliper, it is for detecting the central diameter of acme thread to be measured, it is characterized in that, it comprises laminal first clamp and the second clamp, the stepped tooth that described first clamp is identical with thread form angle with the pitch the second clamp respectively with multiple and described acme thread to be measured, dovetail groove is formed between adjacent two stepped tooths, wherein:
A circumference is got as datum line in the large footpath margin tolerance of described acme thread to be measured, when the central diameter of described screw thread to be measured is tolerance maximal value, the distance between two intersection points that described datum line is crossing with the tooth form hypotenuse of described acme thread to be measured is the slot bottom width of the dovetail groove of described first clamp; When the central diameter of described screw thread to be measured is tolerance minimum value, the distance between two intersection points that described datum line is crossing with the extended line of the tooth form hypotenuse of described acme thread to be measured is the slot bottom width of the dovetail groove of described second clamp.
2. a kind of acme thread calliper according to claim 1, is characterized in that: the stepped tooth height of described first clamp is less than or equal to the thread height of described acme thread to be measured.
3. a kind of acme thread calliper according to claim 1, is characterized in that: the stepped tooth height of described second 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, is characterized in that: described first clamp, described second clamp also have respectively the shank for hand-held.
5. acme thread calliper according to claim 1 is for detecting the detection method of the pitch diameter of thread, it is characterized in that, comprises the following steps:
(1) tolerance limit detects: snap on acme thread to be measured by described first clamp, and light pressure makes described first clamp be meshed with the tooth form of described acme thread to be measured is adjacent to, with one end of described first clamp and described acme thread engagement place to be measured for rotating shaft, the other end of the first clamp described in horizontal hunting;
(2) lower variation of tolerance detects: snapped in by described second clamp on described acme thread to be measured, and light pressure makes described second clamp be meshed with the tooth form of described acme thread to be measured is adjacent to, with one end of described second clamp and described acme thread engagement place to be measured for rotating shaft, the other end of the first clamp described in horizontal hunting.
6. detection method according to claim 5, is characterized in that: described first clamp or described second clamp vertically snap on described acme thread to be measured along the axis of described acme thread to be measured.
7. detection method according to claim 5, is characterized in that: in step (1), along the other end of the first clamp described in the direction horizontal hunting contrary with thread rotary orientation.
8. detection method according to claim 5, is characterized in that: in step (2), along the other end of the second clamp described in the direction horizontal hunting contrary 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 CN103090755A (en) | 2013-05-08 |
| CN103090755B true CN103090755B (en) | 2015-01-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN110369814B (en) * | 2019-08-07 | 2020-07-21 | 上海电气上重碾磨特装设备有限公司 | Caliper gauge and method for controlling thread starting point by using caliper gauge |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU922491A2 (en) * | 1980-06-12 | 1982-04-23 | Первый Государственный Ордена Ленина И Ордена Октябрьской Революции Подшипниковый Завод | Two-contact device for measuring diameters |
| CN2061271U (en) * | 1990-02-14 | 1990-08-29 | 三星五金工厂股份有限公司 | Thread gauge for measuring inner parallel screw threads of nut |
| FR2790080B1 (en) * | 1999-02-24 | 2001-04-06 | Vallourec Mannesmann Oil & Gas | METHOD FOR CONTROLLING A CONICAL THREAD AND RELATED CONTROL DEVICES |
| CN1391083A (en) * | 2001-06-07 | 2003-01-15 | 天津钢管公司 | Metric gauge for examining screw joint of sleeve pipes with special specification |
| CN203069079U (en) * | 2013-02-01 | 2013-07-17 | 纽威石油设备（苏州）有限公司 | Trapezoidal screw snap gauge |
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