CN106871766A - The measuring method of big pitch pitch diameter of external thread - Google Patents
The measuring method of big pitch pitch diameter of external thread Download PDFInfo
- Publication number
- CN106871766A CN106871766A CN201611241406.4A CN201611241406A CN106871766A CN 106871766 A CN106871766 A CN 106871766A CN 201611241406 A CN201611241406 A CN 201611241406A CN 106871766 A CN106871766 A CN 106871766A
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- China
- Prior art keywords
- thread
- pitch
- diameter
- metering
- gauge block
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The invention discloses a kind of measuring method of big pitch pitch diameter of external thread, belong to machining field of measuring technique, comprise the following steps：Step A, three metering pins of same diameter are selected according to thread pitch and form of thread angle；Step B, it is outside thread recessed it is interior be placed in parallel above-mentioned three metering pins, wherein two metering pins are arranged on another opposite side of metering pin；Step C, according to thread pitch select a gauge block；Step D, gauge block front is adjacent on two tops of metering pin positioned at identical side；Step E, the back side and another top of metering pin that two measuring staffs of micrometer are respectively perpendicular contact gauge block；Step F, according to formula calculate the pitch diameter of thread；The present invention is by gauge block two metering pins of parallel connection, make micrometer without while being contacted with two metering pins, the measuring staff diameter for avoiding micrometer is too short compared to the distance of metering pin, and the problem that cannot be measured, efficiently solve the problems, such as to measure steep-pitch thread central diameter.
Description
Technical field
The present invention relates to machine field of measuring technique, the especially measuring method of big pitch pitch diameter of external thread.
Background technology
Whether the measurement of the pitch diameter of thread is for judging thread size and the qualified a kind of conventional method of inspection of tooth form, screw thread
The traditional measurement method of central diameter is advised including the plug screw using standard, bung flange advises direct measurement or uses three-needle measuring；Three-needle measuring
It is a kind of accurate method of comparing of measurement pitch diameter of external thread, during measurement, there is same diameter in outside thread recessed interior placement
Three metering pins, then with three vertical ranges on metering pin top of miking, processed screw thread are verified by calculating
Whether central diameter is correct.
But, when thread pitch is larger, using three-needle measuring method, two measuring staff diameters of micrometer cannot meet and three
Individual metering pin is contacted simultaneously, just cannot realize measurement.
The content of the invention
The technical problem to be solved in the invention is to provide a kind of measuring method of big pitch pitch diameter of external thread.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
1st, the measuring method of big pitch pitch diameter of external thread, it is characterised in that comprise the following steps：
Step A, three metering pins of same diameter are selected according to thread pitch and form of thread angle, computing formula is：
In formula：
D represents metering pin diameter, unit mm；
P represents thread pitch, unit mm；
A/2 represents half of thread angle, unit °；
Step B, it is outside thread recessed it is interior be placed in parallel above-mentioned three metering pins, wherein two metering pins are arranged on another metering pin
Opposite side；
Step C, according to thread pitch select a gauge block；
Step D, gauge block front is adjacent on two tops of metering pin positioned at identical side；
Step E, the back side and another top of metering pin that two measuring staffs of micrometer are respectively perpendicular contact gauge block；
Step F, according to below equation calculate the pitch diameter of thread,
In formula：
D represents metering pin diameter, unit mm；
d1Represent gauge block thickness, unit mm；
d2Represent the pitch diameter of thread, unit mm；
M represents the numerical value that micrometer is measured, unit mm；
A/2 represents half of thread angle, unit °；
P represents thread away from unit mm.
Technical solution of the present invention further improvement is that：In the step C, selection Gauge Block Length is the spiral shell more than screw thread
Away from the thickness deviation ＜ 0.03mm of selection gauge block.
Technical solution of the present invention further improvement is that：In the step C, selection Gauge Block Length is more than thread pitch
Twice.
By adopting the above-described technical solution, the technological progress that the present invention is obtained is：
The present invention makes micrometer without while being contacted with two metering pins by gauge block two metering pins of parallel connection, it is to avoid
The measuring staff diameter of micrometer is too short compared to the distance of metering pin, and the problem that cannot be measured, efficiently solve the big spiral shell of measurement
Away from the problem of the pitch diameter of thread.
The present invention is preferably provided with more than the twice that the length of gauge block is thread pitch, makes gauge block and two same phases of metering pin
Cut, it is ensured that the accuracy of measurement.
Brief description of the drawings
Fig. 1 is the schematic diagram of measuring method of the present invention；
Wherein, 1, screw thread, 2, measuring staff, 3, metering pin, 4, template.
Specific embodiment
The present invention is described in further details with reference to embodiment：
As shown in figure 1, the present invention includes for the device that measures the pitch diameter of thread, with two micrometers of measuring staff 2, three
Metering pin 3 with same diameter, for connect two templates of metering pin 34；Wherein micrometer is existing common micrometer, metering pin 3
Need to according to actual needs be selected or be made with template 4.
When the measurement of big pitch pitch diameter of external thread is carried out, using following steps：
Step A, three metering pins of same diameter are selected according to thread pitch and form of thread angle, the calculating of metering pin diameter is public
Formula is：
In formula：
D represents metering pin diameter, unit mm；
P represents thread pitch, unit mm；
A/2 represents half of thread angle, unit °.
As shown in figure 1, step B, it is outside thread recessed it is interior be placed in parallel above-mentioned three metering pins, wherein two metering pins are arranged on
Another opposite side of metering pin.
Step C, a gauge block is selected according to thread pitch, selection Gauge Block Length need to meet pitch more than screw thread, selection
The thickness deviation ＜ 0.03mm of gauge block；Gauge Block Length should meet the twice more than thread pitch in preferred, for example, carrying out spiral shell
When line tooth pitch is the pitch diameter of thread measurement of 50mm, the gauge block that specification is 100*50*10mm can be selected.
As shown in figure 1, step D, gauge block front is adjacent on two tops of metering pin positioned at identical side.
As shown in figure 1, step E, the back side that two measuring staffs of micrometer are respectively perpendicular contact gauge block and another metering pin
Top.
Step F, according to below equation calculate the pitch diameter of thread,
In formula：
D represents metering pin diameter, unit mm；
d1Represent gauge block thickness, unit mm；
d2Represent the pitch diameter of thread, unit mm；
M represents the numerical value that micrometer is measured, unit mm；
A/2 represents half of thread angle, unit °；
P represents thread away from unit mm.
The pitch diameter of thread that will be calculated is contrasted with the pitch diameter of thread of design requirement, so as to judge whether the screw thread of processing accords with
Close and require.
Claims (3)
1. the measuring method of big pitch pitch diameter of external thread, it is characterised in that comprise the following steps：
Step A, three metering pins of same diameter are selected according to thread pitch and form of thread angle, computing formula is：
In formula：
D represents metering pin diameter, unit mm；
P represents thread pitch, unit mm；
A/2 represents half of thread angle, unit °；
Step B, it is outside thread recessed it is interior be placed in parallel above-mentioned three metering pins, wherein two metering pins are arranged on another phase of metering pin
To side；
Step C, according to thread pitch select a gauge block；
Step D, gauge block front is adjacent on two tops of metering pin positioned at identical side；
Step E, the back side and another top of metering pin that two measuring staffs of micrometer are respectively perpendicular contact gauge block；
Step F, according to below equation calculate the pitch diameter of thread,
In formula：
D represents metering pin diameter, unit mm；
d1Represent gauge block thickness, unit mm；
d2Represent the pitch diameter of thread, unit mm；
M represents the numerical value that micrometer is measured, unit mm；
A/2 represents half of thread angle, unit °；
P represents thread away from unit mm.
2. the measuring method of big pitch pitch diameter of external thread according to claim 1, it is characterised in that：In the step C, choosing
It is the pitch more than screw thread to select Gauge Block Length, selects the thickness deviation ＜ 0.03mm of gauge block.
3. the measuring method of big pitch pitch diameter of external thread according to claim 2, it is characterised in that：In the step C, choosing
It is the twice more than thread pitch to select Gauge Block Length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611241406.4A CN106871766A (en) | 2016-12-29 | 2016-12-29 | The measuring method of big pitch pitch diameter of external thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611241406.4A CN106871766A (en) | 2016-12-29 | 2016-12-29 | The measuring method of big pitch pitch diameter of external thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106871766A true CN106871766A (en) | 2017-06-20 |
Family
ID=59165158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611241406.4A Pending CN106871766A (en) | 2016-12-29 | 2016-12-29 | The measuring method of big pitch pitch diameter of external thread |
Country Status (1)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590678A (en) * | 1984-12-03 | 1986-05-27 | Alonso Arredondo | Technique for determining thread accuracy |
| CN104748646A (en) * | 2015-03-30 | 2015-07-01 | 沈阳飞机工业（集团）有限公司 | External thread pitch diameter measuring method |
| CN204574999U (en) * | 2015-03-23 | 2015-08-19 | 西安华欧精密机械有限责任公司 | Tray (well) diameter detector in metering pin integrated form leading screw |
| CN105300239A (en) * | 2015-10-28 | 2016-02-03 | 吉林东光集团有限公司 | Method and device for measuring pitch diameter of external thread |
-
2016
- 2016-12-29 CN CN201611241406.4A patent/CN106871766A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590678A (en) * | 1984-12-03 | 1986-05-27 | Alonso Arredondo | Technique for determining thread accuracy |
| CN204574999U (en) * | 2015-03-23 | 2015-08-19 | 西安华欧精密机械有限责任公司 | Tray (well) diameter detector in metering pin integrated form leading screw |
| CN104748646A (en) * | 2015-03-30 | 2015-07-01 | 沈阳飞机工业（集团）有限公司 | External thread pitch diameter measuring method |
| CN105300239A (en) * | 2015-10-28 | 2016-02-03 | 吉林东光集团有限公司 | Method and device for measuring pitch diameter of external thread |
Non-Patent Citations (2)
| Title |
|---|
| 广东、北京、广西中等职业技术学校教材编写委员会组: "《机械基础 第二分册：公差配合与测量技术》", 28 February 2003, 广东高等教育出版社 * |
| 黄宏振等: "《计量鉴定修理工》", 31 October 1994, 中国劳动出版社 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170620 |