CN106225739B - A kind of Pneumatic measuring head measuring high-precision hemisphere sphere diameter - Google Patents
A kind of Pneumatic measuring head measuring high-precision hemisphere sphere diameter Download PDFInfo
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- CN106225739B CN106225739B CN201610787432.0A CN201610787432A CN106225739B CN 106225739 B CN106225739 B CN 106225739B CN 201610787432 A CN201610787432 A CN 201610787432A CN 106225739 B CN106225739 B CN 106225739B
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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
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/08—Measuring arrangements characterised by the use of fluids for measuring diameters
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Abstract
The present invention relates to a kind of Pneumatic measuring heads for measuring high-precision hemisphere sphere diameter, including measuring head ontology, measuring head ontology is equipped with for hemisphere corresponding matching to be measured and forming the standard ball-and-socket in aerial drainage gap, standard ball-and-socket is equipped with the air inlet for supplying gas to the aerial drainage gap between hemisphere to be measured and standard ball-and-socket, air inlet has the air inlet towards the hemisphere to be measured, vent grooves are equipped in the Internal Spherical Surface of standard ball-and-socket, the slot bottom of the vent grooves is arranged in the air inlet of the air inlet.Since measuring head ontology is equipped with standard ball-and-socket, by standard ball-and-socket and corresponding matching to be measured and aerial drainage gap is formed, is supplied gas by the air inlet on standard ball-and-socket into aerial drainage gap, realizes the pneumatic gauging to hemisphere sphere diameter to be measured.Measurement method is simple, easy to operate, and measurement efficiency is high, and time of measuring is short, and repeatability is high, and measurement limitation is small, and measurement abrasion is small, or even without abrasion.
Description
Technical field
The present invention relates to a kind of Pneumatic measuring heads for measuring high-precision hemisphere sphere diameter.
Background technique
Gyro machine is applied to space flight, aviation, navigation equipment flight attitude and heading control loop, precision and directly affects
To the precision of posture control system, and bearing is the core component of gyro machine, the direct shadow of the accuracy of manufacture and assembly precision of bearing
Ring precision, service life and the reliability for arriving gyro machine.With the raising that posture control system requires bearing accuracy, gas dynamic pressure formula top
For spiral shell motor bearings using more and more extensive, dome-type aero dynamic bearing is exactly one such.To meet gyro machine bearing
Bearing capacity and rigidity, dome-type aero dynamic bearing air film gap is only several microns, therefore it is required that spherical face roughness,
Surface of sphere and spheroid diameter difference are submicron order, and spheroid diameter difference directly affects the performance of dome-type aero dynamic bearing, and hemisphere sphere diameter
Precise measurement it is most important.For many years, a kind of there are mainly two types of the hemisphere spherical diameter measurement methods of dome-type aero dynamic bearing
Measurement method be hemisphere is assembled with standard sphere diameter ball-and-socket together with, pass through measurement hemisphere and ball-and-socket radial internal clearance and axial play
Gap to calculate the sphere diameter of hemisphere indirectly；Another measurement method is optical interferometry, and hemisphere is placed on the organic glass of standard sphere diameter
In glass ball-and-socket, the sphere diameter of hemisphere is measured by observation interference of light striped.First method shortcoming is: hemisphere and ball-and-socket group
With together when, hemisphere and ball-and-socket should be by stringent cleanings, it is desirable that assemble environment height, therefore efficiency is very low, measurement cost is high, measurement
Time is long, and can only measure the hemisphere smaller than ball-and-socket sphere diameter, so measurement method limitation is bigger；Second method is insufficient
Place is: since spherical surface deviation from circular from can reflect in interference fringe, therefore causing measurement accuracy relatively low, and the dust of very little
Measurement will be caused invalid, therefore the repeatability of measurement accuracy is relatively low.
Also there are the precise measurement using the realization of existing pneumatic gauging technology to hemisphere sphere diameter, pneumatic gauging in the prior art
Technology needs to use pneumatic measuring instrument, and pneumatic measuring instrument is a kind of new type measuring instrument used in machine building industry, it be by
The variable quantity of workpiece size is converted to the flow of compressed air or the variation of pressure, is then indicated by instruction device, thus
Measure the scale error of workpiece size.Pneumatic gauging technology is to react quilt by the variation of the flow and pressure that measure gas
Survey the technology of part size, physical principle is substantially as follows: the size in the gap of the flow and pressure and gas aerial drainage of gas at than
Example relationship, while inversely prroportional relationship is between pressure and flow.Compressed air after pressure regulation is through the tune in pneumatic measuring instrument
It is obtained at the nozzle of Pneumatic measuring head after section valve, if nozzle against atmosphere, does not have blocking object at nozzle, it will have max-flow
The gas of amount is by nozzle, at this point, there are a minimum pressure between regulating valve and nozzle, when make obstacle from as far as closely leaning on
When nearly nozzle, the gas of ejection is due to being stopped, and flow will be with reduction, while pressure can gradually rise, when nozzle quilt
After blocking completely, flow zero, pressure will rise to maximum.Prize the distance between obstacle and nozzle are defined as aerial drainage gap, disease
The above-mentioned change procedure production flow-aerial drainage gap of root and pressure-aerial drainage gap curve graph, it can be seen from the figure that in addition to pressure
Power and flow and initial and saturation stage, are all straight lines in the other parts of two curved sections, i.e. flow and aerial drainage gap is one
In a linear relationship within the scope of fixed gap, pressure is also in a linear relationship in certain aerial drainage interstice coverage with aerial drainage gap.Such one
Come, measurement aerial drainage interval can be corresponded to by measuring flow or pressure.
A kind of symmetrical ball-and-socket ball is disclosed in the Chinese invention patent application that application publication number is CN104848810A
Diameter pneumoelectric measuring instrument, this measuring instrument use pneumatic gauging technology to measure ball-and-socket sphere diameter, and pneumoelectric measuring instrument includes pneumoelectric electronics
Column, the calibration component group with the Pneumatic measuring head of tested ball-and-socket Corresponding matching and with Pneumatic measuring head Corresponding matching, pneumatic gauging
Head is spheroid form, and the gas passage of two gas delivery ports of band, gas passage and pneumoelectric electronics are equipped on Pneumatic measuring head
The gas output end of column is connected, and two gas delivery ports are located at correspondingly in the upper and lower surface of the sphere of Pneumatic measuring head, from
And top nozzle and lower nozzle are formed, the gas with certain pressure exported from the gas output end of pneumoelectric electron column is logical through gas
Sprayed behind road from upper and lower nozzle, in use, Pneumatic measuring head is placed in symmetrical ball-and-socket, the gas with certain pressure respectively from
Between aerial drainage gap and lower nozzle between top nozzle and the upper nest wall of symmetrical ball-and-socket and the lower nest wall of symmetrical expression ball-and-socket
Aerial drainage gap is to outer nozzle aerial drainage, the gas flow or pressure of the gas output end output by measuring pneumoelectric electron column
The size in aerial drainage gap is obtained according to corresponding linear relationship, and then the sphere diameter of symmetrical ball-and-socket is obtained according to sphere sphere diameter.
But the Pneumatic measuring head in above-mentioned sphere diameter pneumoelectric measuring instrument is spherical structure, is simply possible to use in and surveys to ball-and-socket radius
Amount can not carry out pneumatic gauging to hemisphere sphere diameter.Moreover, two nozzles on above-mentioned Pneumatic measuring head are set up directly on the outer of sphere
Base on spherical surface, when Pneumatic measuring head to be placed in symmetrical ball-and-socket, between Pneumatic measuring head and symmetrical ball-and-socket to be measured
Plinth is contacted there are line and face contact, and the position of the contact of these lines and face contact can not determine in advance, and the position of nozzle up and down
Really directly fixed is provided on Pneumatic measuring head, to avoid the position of the contact of these lines or face contact from causing upper and lower nozzle
It blocks and influences normal measurement, need to adjust the position of Pneumatic measuring head repeatedly, so, not only measurement efficiency is lower,
And adjustment repeatedly also can cause additional wear to Pneumatic measuring head and ball-and-socket to be measured, and reduce Pneumatic measuring head uses the longevity
Life, influences the precision of ball-and-socket to be measured.Also, it due to the aerial drainage gap between ball-and-socket and sphere and does not know, is directly arranged in ectosphere
Stability is bad when nozzle on face is inflated to aerial drainage gap, and then will affect the measurement of gas flow and pressure, influences to measure
Precision.
Summary of the invention
The present invention provides a kind of Pneumatic measuring head of measurement high-precision hemisphere sphere diameter for measuring to hemisphere sphere diameter.
The technical solution of the Pneumatic measuring head of measurement high-precision hemisphere sphere diameter provided by the present invention is: a kind of measurement is high-precision
Spend the Pneumatic measuring head of hemisphere sphere diameter, including measuring head ontology, measuring head ontology be equipped with for hemisphere corresponding matching to be measured
And the standard ball-and-socket in aerial drainage gap is formed, standard ball-and-socket is equipped with for the aerial drainage gap between hemisphere to be measured and standard ball-and-socket
The air inlet supplied gas, air inlet have the air inlet towards the hemisphere to be measured, and ventilation is equipped in the Internal Spherical Surface of standard ball-and-socket
The slot bottom of the vent grooves is arranged in groove, the air inlet of the air inlet.
The vent grooves extend along the warp extending direction of the Internal Spherical Surface of the standard ball-and-socket.
At least one end of the vent grooves is the hatch frame for extending to the end face edge of standard ball-and-socket.
The vent grooves are U-type groove structure.
The vent grooves and air inlet are evenly equipped with two or more along the circumferentially-spaced of standard ball-and-socket.
The nest bottom of the standard ball-and-socket is equipped with the gas vent for vent grooves connection.
The Internal Spherical Surface of the nest bottom of the standard ball-and-socket is equipped with the exhaust groove being connected to the vent grooves, exhaust
Hole has towards the inner end aperture of hemisphere to be measured, and the inner end aperture of gas vent is arranged on the cell wall of the exhaust groove.
The beneficial effects of the present invention are: the Pneumatic measuring head of measurement high-precision hemisphere sphere diameter provided by the present invention is using
When, since measuring head ontology is equipped with standard ball-and-socket, by standard ball-and-socket and corresponding matching to be measured and aerial drainage gap is formed, passes through mark
Air inlet on quasi- ball-and-socket is supplied gas into aerial drainage gap, realizes the pneumatic gauging to hemisphere sphere diameter to be measured.Measurement method is simple, behaviour
Facilitate, measurement efficiency is high, and time of measuring is short, and repeatability is high, and measurement limitation is small, and measurement abrasion is small, or even without abrasion.And
And the slot bottom for the vent grooves being equipped with due to standard ball-and-socket is arranged in the air inlet of air inlet Internal Spherical Surface, when standard ball-and-socket
Line occurs with hemisphere to be measured contact or when face contact, contact portion can be reduced to the greatest extent and block air inlet and influence air inlet
The probability that hole works normally, by Pneumatic measuring head and tested hemisphere group timing, not needing to adjust repeatedly directly to be surveyed
Amount can effectively improve measurement efficiency, reduce influence of the contact site to measurement.Moreover, the slot of vent grooves is arranged in air inlet
Bottom, the air-flow being discharged at air inlet is relatively stable, and then measurement accuracy can be improved.
Further, vent grooves extend along the warp extending direction of the Internal Spherical Surface of standard ball-and-socket, convenient for arranging through air inlet
Gas out quickly enters hemisphere to be measured and standard ball-and-socket is formed by aerial drainage gap.
Further, the both ends of vent grooves are hatch frame, are convenient for gas aerial drainage, prevent from forming seal cavity and inciting somebody to action half
Ball is strutted with standard ball-and-socket, guarantees measurement accuracy.
Further, vent grooves are U-type groove structure, and U-type groove construction standard is stablized, and structure is convenient for designing and producing.
Further, gas vent is set on standard ball-and-socket, convenient for the gas in aerial drainage gap to be discharged, avoids to be measured
Seal chamber is formed between hemisphere and standard ball-and-socket and influences the normal measurement to hemisphere sphere diameter.
Further, the outer end aperture of gas vent is arranged in exhaust groove, and localized contact is avoided to block gas vent.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing high-precision hemisphere；
Fig. 2 is provided by the present invention for measuring a kind of knot of embodiment of the Pneumatic measuring head of high-precision hemisphere sphere diameter
Structure schematic diagram；
Fig. 3 is signal when measuring the sphere diameter of high-precision hemisphere as shown in Figure 1 using Pneumatic measuring head as shown in Figure 2
Figure.
Specific embodiment
As shown in Figure 1 to Figure 3, a kind of embodiment for the Pneumatic measuring head measuring high-precision hemisphere sphere diameter, including measuring head
Ontology 300, the side of measuring head ontology 300 be concavely provided with for 100 corresponding matching of hemisphere to be measured and form aerial drainage gap 200
Standard ball-and-socket, the structure of hemisphere to be measured is equipped with the semiglobe of frustal plane, half ball center to be measured for top referring to Fig. 1
Central through hole is equipped at axial location.It is equipped on standard ball-and-socket for the aerial drainage between hemisphere 100 to be measured and standard ball-and-socket
The air inlet that gap 200 is supplied gas, air inlet herein includes the first air inlet 1 and the second air inlet 6, and two air inlets are along standard ball
Nest it is circumferentially-spaced uniformly distributed, two air inlets are respectively provided with the air inlet towards hemisphere to be measured.It is set in the Internal Spherical Surface 4 of standard ball-and-socket
The circumferentially-spaced uniformly distributed vent grooves for having corresponding two air inlets to be correspondingly provided with two along standard ball-and-socket, two vent grooves are U
Type groove structure, two vent grooves are and corresponding first vent grooves 2 of the first air inlet 1 and corresponding with the second air inlet 6 the
Two vent grooves 5, the air inlet of the first air inlet 1 are arranged in the slot bottom of the first vent grooves 2, and the air inlet of the second air inlet 6
Mouth is arranged at the slot bottom position of the second vent grooves 5.
Two vent grooves extend along the warp extending direction of the Internal Spherical Surface 4 of standard ball-and-socket.The upper end of two vent grooves is
Extend to the hatch frame of the upper surface edge of standard ball-and-socket.
In the present embodiment, the nest bottom of standard ball-and-socket is equipped with the gas vent 3 for being connected to vent grooves, also, standard
The Internal Spherical Surface of the nest bottom of ball-and-socket is equipped with the exhaust groove 7 being connected to two vent grooves, and gas vent 3 has towards hemisphere to be measured
Inner end aperture, the inner end aperture of gas vent 3 is arranged on the cell wall of exhaust groove 7.
When measurement, hemisphere to be measured is placed in the standard ball-and-socket of Pneumatic measuring head, and compressed air is connected to standard
It in two air inlets of ball-and-socket, is inflated into aerial drainage gap 200, when the sphere diameter of hemisphere 100 to be measured differs larger with the sphere diameter of standard
When, aerial drainage gap is relatively large, and compressed air aerial drainage is more, and flow is larger.And when the sphere diameter of hemisphere to be measured and standard ball-and-socket
When sphere diameter difference is smaller, aerial drainage gap is relatively small, and compressed air aerial drainage is less, and flow is less.
The flow L for flowing into two air inlets, and the sphere diameter and standard ball of hemisphere to be measured are observed by measuring instruments such as flow valves
The spheroid diameter difference of nest is converted to the flow of compressed air, by measuring the flow of compressed air to obtain hemisphere to be measured and standard ball
The spheroid diameter difference of nest, since the sphere diameter of standard ball-and-socket is known, therefore the sphere diameter that can calculate hemisphere to be measured is.
Flow and width, depth and the spheroid diameter difference of U-type groove of compressed air etc. have relationship, when the width and depth of U-type groove
The flow of one timing, spheroid diameter difference and compressed air exists, due to U-type groove width and depth in practical manufacturing process there is always
When certain foozle, and actual size can not be measured really, therefore practical operation functional relation can be by being had in advance
Secondary test is limited to determine.
Vent grooves on standard ball-and-socket provided by the present embodiment are U-type groove structure, in other embodiments, are ventilated recessed
Slot may be V-groove or rectangular groove structure.
In the present embodiment, vent grooves extend along the warp extending direction of ball, and it is empty to be easy to implement compression in this way
The aerial drainage of gas, avoids the occurrence of closed cavity.
In the present embodiment, it is not provided only with air inlet on standard ball-and-socket, is additionally provided with gas vent.In other embodiments,
Air inlet can also be only set to Pneumatic measuring head is the same provided by the prior art.
Claims (5)
1. a kind of Pneumatic measuring head for measuring high-precision hemisphere sphere diameter, including measuring head ontology, it is characterised in that: measuring head ontology
It is equipped with for hemisphere corresponding matching to be measured and forming the standard ball-and-socket in aerial drainage gap, standard ball-and-socket is equipped with for to be measured
The air inlet that aerial drainage gap between hemisphere and standard ball-and-socket is supplied gas, air inlet have the air inlet towards the hemisphere to be measured,
Vent grooves are equipped in the Internal Spherical Surface of standard ball-and-socket, the slot bottom of the vent grooves is arranged in the air inlet of the air inlet；
The vent grooves extend along the warp extending direction of the Internal Spherical Surface of the standard ball-and-socket；At least the one of the vent grooves
End is the hatch frame for extending to the end face edge of standard ball-and-socket.
2. the Pneumatic measuring head of measurement high-precision hemisphere sphere diameter according to claim 1, it is characterised in that: the ventilation
Groove is U-type groove structure.
3. the Pneumatic measuring head of measurement high-precision hemisphere sphere diameter according to any one of claim 1 to 2, feature exist
In: the vent grooves and air inlet are evenly equipped with two or more along the circumferentially-spaced of standard ball-and-socket.
4. the Pneumatic measuring head of measurement high-precision hemisphere sphere diameter according to any one of claim 1 to 2, feature exist
It is equipped in: the nest bottom of the standard ball-and-socket for being used for what hemisphere to be measured and standard ball-and-socket were formed by that aerial drainage gap is connected to
For the gas vent of the gas discharge in aerial drainage gap.
5. the Pneumatic measuring head of measurement high-precision hemisphere sphere diameter according to claim 4, it is characterised in that: the standard
The Internal Spherical Surface of the nest bottom of ball-and-socket is equipped with the exhaust groove being connected to the vent grooves, and gas vent has towards hemisphere to be measured
Inner end aperture, the inner end aperture of gas vent is arranged on the cell wall of the exhaust groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610787432.0A CN106225739B (en) | 2016-08-31 | 2016-08-31 | A kind of Pneumatic measuring head measuring high-precision hemisphere sphere diameter |
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| CN201610787432.0A CN106225739B (en) | 2016-08-31 | 2016-08-31 | A kind of Pneumatic measuring head measuring high-precision hemisphere sphere diameter |
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| CN106225739B true CN106225739B (en) | 2019-05-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107764214A (en) * | 2017-11-17 | 2018-03-06 | 宁波慈兴轴承有限公司 | A kind of flexible bearing outside diameter measuring fixture and its method of work |
| CN109141212B (en) * | 2018-10-31 | 2020-07-10 | 嘉兴德基机械设计有限公司 | Symmetry formula ball socket sphere footpath dish hub pneumoelectric measuring apparatu |
| CN110715624A (en) * | 2019-10-24 | 2020-01-21 | 重庆美心翼申机械股份有限公司 | Detection tool and detection method for pneumatically detecting taper angle |
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| SU1486787A1 (en) * | 1987-10-16 | 1989-06-15 | Aleksandr F Korneev | Pneumatic method of determining radius of spheric surface |
| CN1995910A (en) * | 2006-11-17 | 2007-07-11 | 南昌大学 | High-accuracy sphericity pneumatic measuring system |
| CN200979405Y (en) * | 2006-10-30 | 2007-11-21 | 南昌大学 | A high precision sphericity pneumatic gauge |
| CN104848810A (en) * | 2015-04-29 | 2015-08-19 | 张家港海太精密量仪科技有限公司 | Ball diameter electro-pneumatic measuring instrument for symmetric ball socket |
| CN105004288A (en) * | 2015-07-22 | 2015-10-28 | 郑州中量测控科技有限公司 | Pneumatic internal-diameter measurement device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203518960U (en) * | 2013-09-26 | 2014-04-02 | 三门峡中测量仪有限公司 | Scratch-proof pneumatic connecting rod measuring instrument |
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2016
- 2016-08-31 CN CN201610787432.0A patent/CN106225739B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1486787A1 (en) * | 1987-10-16 | 1989-06-15 | Aleksandr F Korneev | Pneumatic method of determining radius of spheric surface |
| CN200979405Y (en) * | 2006-10-30 | 2007-11-21 | 南昌大学 | A high precision sphericity pneumatic gauge |
| CN1995910A (en) * | 2006-11-17 | 2007-07-11 | 南昌大学 | High-accuracy sphericity pneumatic measuring system |
| CN104848810A (en) * | 2015-04-29 | 2015-08-19 | 张家港海太精密量仪科技有限公司 | Ball diameter electro-pneumatic measuring instrument for symmetric ball socket |
| CN105004288A (en) * | 2015-07-22 | 2015-10-28 | 郑州中量测控科技有限公司 | Pneumatic internal-diameter measurement device |
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Effective date of registration: 20180514 Address after: 471000 No. 1 axis research road, Jianxi science and Technology Industrial Park, Luoyang, Henan Applicant after: Luoyang Bearing Research Institute Address before: 471039 Fenghua Road 6, hi tech Development Zone, Luoyang, Henan. Applicant before: Zhouyan Science and Technology Co., Ltd., Luoyang |
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