阅读说明：本技术 一种用于测量高精度浅孔直径的测量装置及采用其测量浅孔的方法 (A method of for measuring the measuring device of high-precision shallow bore hole diameter and measuring shallow bore hole using it ) 是由 郭霞 葛蕾 杨静 吉建新 张俊 高锋利 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种用于测量高精度浅孔直径的测量装置,包括气动测量头和气动测量仪,气动测量头一端为螺纹端,另一端为圆柱端,气动测量头通过螺纹端与气动测量仪连接；气动测量头内开有通气盲孔,通气盲孔贯穿了螺纹端,且伸至圆柱端内；圆柱端上开有环形喷嘴排气槽,在环形喷嘴排气槽的中心位置开有径向通孔,径向通孔与通气盲孔相贯通。零件被测量面完全包容了气动测量头的环形结构排气槽,排气槽在使用过程中,空气流量均匀,测量过程稳定,解决了标准量头测量不准确的问题。还公开了采用其测量浅孔的方法,测量过程简单,气动测量精度高,解决了普通塞规精度低的问题。(The invention discloses a kind of for measuring the measuring device of high-precision shallow bore hole diameter, including Pneumatic measuring head and pneumatic measuring instrument, and Pneumatic measuring head one end is the end of thread, and the other end is cylindrical end, and Pneumatic measuring head is connect by the end of thread with pneumatic measuring instrument；Ventilation blind hole is provided in Pneumatic measuring head, ventilation blind hole has run through the end of thread, and extends in cylindrical end；It is provided with nozzle ring air discharge duct on cylindrical end, is provided with radial through-hole in the center of nozzle ring air discharge duct, radial through-hole connects with ventilation blind hole.Part measured surface has contained the ring structure air discharge duct of Pneumatic measuring head completely, and in use, air mass flow is uniform for air discharge duct, and measurement process is stablized, and solves the problems, such as standard volume head measurement inaccuracy.The method that shallow bore hole is measured using it is also disclosed, measurement process is simple, and pneumatic gauging precision is high, solves the problems, such as that regular surface gauge precision is low.)

1. a kind of for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that including Pneumatic measuring head (1) and pneumatically Measuring instrument (2), Pneumatic measuring head (1) one end are the end of thread (11), and the other end is cylindrical end (12), and Pneumatic measuring head (1) passes through The end of thread (11) is connect with pneumatic measuring instrument (2)；

Ventilation blind hole (15) is provided in Pneumatic measuring head (1), ventilation blind hole (15) has run through the end of thread (11), and extends to cylindrical end (12) in；

It is provided with nozzle ring air discharge duct (13) on cylindrical end (12), is provided with radial direction in the center of nozzle ring air discharge duct (13) Through-hole (14), radial through-hole (14) connect with ventilation blind hole (15).

2. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that cylindrical end (12) diameter is 0.01~0.05mm smaller than the diameter of measured hole.

3. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that nozzle ring The width of air discharge duct (13) is 1~5mm.

4. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that nozzle ring The center of air discharge duct (13) is L at a distance from the end face of cylindrical end (12), and the width of nozzle ring air discharge duct (13) is d, The depth of measured hole is S, L+d/2 < S.

5. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that nozzle ring The deflection δ value of air discharge duct (13) is 0.003~0.006mm.

6. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that the end of thread (11) thread parameter is M14.

7. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that ventilation blind hole (15) diameter is 1.5~5mm.

8. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that radial through-hole (14) diameter is (1/3~1/2) of the width value of nozzle ring air discharge duct (13).

9. according to claim 1 for measuring the measuring device of high-precision shallow bore hole diameter, which is characterized in that pneumatic gauging The model QFP type floating type air gauge of instrument (2).

10. using the measuring device measurement shallow bore hole described in claim 1~9 any one for measuring high-precision shallow bore hole diameter Method, which comprises the following steps:

1) pneumatic measuring instrument (2) is adjusted first, pneumatic measuring instrument (2) is adjusted to correct position, i.e. pneumatic gauging The upper limit scale value and lower limit scale value of instrument (2) graduated scale respectively correspond the maximum diameter and minimum diameter of measured hole；

2) Pneumatic measuring head (1) is put into measured hole, adjusts the gas pressure of pneumatic measuring instrument (2), observed pneumatic measuring instrument (2) Buoy position whether fall in upper limit scale value and lower limit scale value；

If buoy position within the scope of upper limit scale value and lower limit scale value, illustrates that tested aperture is qualified；If buoy position is not Within the scope of upper limit scale value and lower limit scale value, then illustrate that tested aperture is unqualified.

Technical field

It is the invention belongs to bore dia measuring tool technical field, in particular to a kind of for measuring the measurement of high-precision shallow bore hole diameter Device and the method that shallow bore hole is measured using it.

Background technique

Currently, measurement bore dia generally uses micrometer or dial gauge, but for depth as shallow and the high shallow bore hole of required precision Or diameter of blind hole measurement, inside micrometer or dial bore gage structure are larger, are not suitable for measuring；It is interior due to hole precision height Hole feeler gauge measurement accuracy does not reach requirement yet.Structure is complicated for dedicated internal diameter measuring tool, and detection non-cutting time is long, and detection efficiency is low, together When, special measuring tool need to compare measurement with standard component, and due to for comparative method for measuring, it is big that measuring tool occupies part tolerance, part Scrappage is high.

For example, when measuring half-blind hole (01) on part as shown in Figure 1 with modular, pneumatically powered feeler gauge, half-blind hole (01) precision Height, depth are only 4.921 millimeters.Due to half-blind hole (1) depth as shallow, the nozzle exhaust bore dia of standard is larger, be Ф 4mm or Ф 6mm often prevents gauging spindle nozzle from measuring reasonable position, causes measurement result unstable, cannot obtain true Part actual size.Therefore, it is necessary to a kind of special measuring device be invented, to solve to measure effect existing for above-mentioned measurement method The problem that rate is low, measurement result is inaccurate.

Summary of the invention

The measuring device that the purpose of the present invention is to provide a kind of for measuring high-precision shallow bore hole diameter and using its measurement The method of shallow bore hole, structure is simple, and measurement process is stablized, and solves the problems, such as modular, pneumatically powered feeler gauge measurement inaccuracy.

The present invention is to be achieved through the following technical solutions:

It is a kind of for measuring the measuring device of high-precision shallow bore hole diameter, including Pneumatic measuring head and pneumatic measuring instrument, pneumatically Measuring head one end is the end of thread, and the other end is cylindrical end, and Pneumatic measuring head is connect by the end of thread with pneumatic measuring instrument；

Ventilation blind hole is provided in Pneumatic measuring head, ventilation blind hole has run through the end of thread, and extends in cylindrical end；

It is provided with nozzle ring air discharge duct on cylindrical end, is provided with radial through-hole, diameter in the center of nozzle ring air discharge duct It connects to through-hole and ventilation blind hole.

Further, the diameter of cylindrical end is 0.01~0.05mm smaller than the diameter of measured hole.

Further, the width of nozzle ring air discharge duct is 1~5mm.

Further, the center of nozzle ring air discharge duct is L, nozzle ring air discharge duct at a distance from the end face of cylindrical end Width be d, the depth of measured hole is S, L+d/2 < S.

Further, the deflection δ value of nozzle ring air discharge duct is 0.003~0.006mm.

Further, the thread parameter of the end of thread is M14.

Further, ventilation diameter of blind hole is 1.5~5mm.

Further, the diameter of radial through-hole is (1/3~1/2) of the width value of nozzle ring air discharge duct.

Further, the model QFP type floating type air gauge of pneumatic measuring instrument.

The invention also discloses the method using the measuring device measurement shallow bore hole for measuring high-precision shallow bore hole diameter, The following steps are included:

1) pneumatic measuring instrument is adjusted first, pneumatic measuring instrument is adjusted to correct position, i.e. pneumatic measuring instrument The upper limit scale value and lower limit scale value of graduated scale respectively correspond the maximum diameter and minimum diameter of measured hole；

2) Pneumatic measuring head is put into measured hole, adjusts the gas pressure of pneumatic measuring instrument, observe the floating of pneumatic measuring instrument Whether cursor position falls in upper limit scale value and lower limit scale value；

If buoy position within the scope of upper limit scale value and lower limit scale value, illustrates that tested aperture is qualified；Buoy position If illustrating that tested aperture is unqualified not within the scope of upper limit scale value and lower limit scale value.

Compared with prior art, the invention has the following beneficial technical effects:

The invention discloses a kind of for measuring the measuring device of high-precision shallow bore hole diameter, including the pneumatic gauging being connected Instrument and Pneumatic measuring head, Pneumatic measuring head one end are the end of thread, nozzle ring air discharge duct are machined on other end cylindrical surface, in ring The center of shape nozzle exhaust slot is provided with radial through-hole, and radial through-hole connects with ventilation blind hole.The end of thread and pneumatic gauging After instrument is connected, the gas flow in pneumatic measuring instrument is by ventilation blind hole and radial through-hole, then passes through nozzle ring air discharge duct Atmosphere is escaped into after being circulated to cylindrical surface and the gap of measured hole.When cylindrical surface and the gap of measured hole change, pneumatic measuring instrument Buoy position corresponding change, the scale error of measured hole can be showed on the graduated scale of pneumatic measuring instrument, thus The diameter dimension for measuring measured hole solves the problems, such as standard volume head measurement inaccuracy.

Further, the diameter of general cylindrical end is 0.01~0.05mm smaller than the diameter of measured hole, is adapted with tested aperture.

Further, the thread parameter of the end of thread is designed as M14, convenient to be attached with pneumatic measuring instrument.

Further, size value of the nozzle ring air discharge duct apart from cylindrical end end face guarantees that tested metering-orifice arc surface can wrap Hold air discharge duct, leakage will not be run by gas in measurement, air mass flow is uniform, and measurement process is stablized.

Further, according to the diameter dimension tolerance of measured hole, 1000 times, 2000 times, 5000 times, 10000 times be can choose Or the floating type air gauge of the different amplification factor such as 20000 times.

The invention also discloses the method using the measuring device measurement shallow bore hole for measuring high-precision shallow bore hole diameter, Measurement process is simple, and pneumatic gauging precision is high, up to 0.002mm, solves the problems, such as that regular surface gauge precision is low.

Detailed description of the invention

Fig. 1 is tested part schematic diagram；

Fig. 2 is air measuring device structural schematic diagram of the invention；

Fig. 3 is the main view of Pneumatic measuring head of the invention；

Fig. 4 is the top view of Pneumatic measuring head of the invention；

Fig. 5 is Pneumatic measuring head A-A cross-sectional view of the invention.

Wherein, 01 is half-blind hole, and 1 is Pneumatic measuring head, and 2 be pneumatic measuring instrument, and 11 be the end of thread, and 12 be cylindrical end, 13 It is radial through-hole for nozzle ring air discharge duct, 14,15 be ventilation blind hole.

Specific embodiment

Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and It is not to limit.

As shown in Figure 2-5, of the invention a kind of for measuring the measuring device of high-precision shallow bore hole diameter, including pneumatic gauging Instrument 2 and Pneumatic measuring head 1, an end of Pneumatic measuring head 1 are the stud of M14, pass through the gas of screw thread and pneumatic measuring instrument 2 Output channel connection；The other end is a cylindrical end 12, and Pneumatic measuring head 1 is connect by the screw thread of M14 with pneumatic measuring instrument 2. Pneumatic measuring head 1 is considered as multi-diameter shaft, is threaded in one end of multi-diameter shaft, open loop shape nozzle exhaust slot on the other end 13。

As shown in Fig. 2, pneumatic measuring instrument 2 uses model QFP type floating type air gauge.According to the diameter ruler of measured hole Very little tolerance can choose the float type of the different amplification factor such as 1000 times, 2000 times, 5000 times, 10000 times or 20000 times Air-gauge.

As seen in figures 3-5, it is provided with nozzle ring air discharge duct 13 on cylindrical end 12, at the center of nozzle ring air discharge duct 13 Position is provided with radial through-hole 14, and radial through-hole 14 connects with ventilation blind hole 15.The diameter of cylindrical end 12 can according to select or The amplification factor of the existing air-gauge in production scene determines, generally 0.01mm~0.05mm smaller than the diameter of measured hole, is convenient for The buoy instruction of pneumatic measuring instrument 2 is adjusted in the position to hold water, the width of nozzle ring air discharge duct 13 is first is that consider tested The depth in hole will not measure second is that nozzle ring air discharge duct 13 should be contained completely by tested metering-orifice arc surface after considering fluting When gas run leakage, be typically designed as 1~5mm, the deflection δ value of nozzle ring air discharge duct 13 is 0.003~0.006mm, this is needed It to be determined through flux experiment, the stability of gas flow when being to guarantee air-gauge measurement.

The size L of end face of the center of nozzle ring air discharge duct 13 apart from cylindrical end 12 should be according to measured hole depth S It is determined with 13 width d of nozzle ring air discharge duct, the depth of measured hole is S, generally L+d/2 < S, guarantees measured hole arc surface energy Enough contain air discharge duct.The diameter of ventilation blind hole 15 is typically designed as 1.5~5mm.The diameter of radial through-hole 14 is typically designed as ring (1/3~1/2) of the width value of shape nozzle exhaust slot 13.

To be illustrated for the half-blind hole 01 for measuring part shown in Fig. 1, the diameter of half-blind hole 01 is It is Ф 20.615mm by the diameter design of cylindrical end 12, maximum gauge reduces 0.01mm than tested bore dia；Have on cylindrical end 12 The size L of one 2mm nozzle ring air discharge duct 13,12 end face of centre distance cylindrical end of nozzle ring air discharge duct 13 is designed as 3mm, in this way, 13 left side of air discharge duct is 2mm apart from 12 end face of cylindrical end, the left side is 4mm, air discharge duct 13 apart from 12 end face of cylindrical end It can be included in completely in tested metering-orifice arc surface 4.921mm, leakage will not be run by gas in measurement, ensure that measurement accuracy. As shown in figure 4, it is the ventilation blind hole 15 of Ф 5mm that, which there is a diameter in the centre of Pneumatic measuring head 1 along axial direction, aperture is at stud end； The radial through-hole 14 that a diameter is Ф 1mm is designed in 13 middle position of nozzle ring air discharge duct, blind with the ventilation at measuring head center Hole 15 communicates.

As shown in figure 5,13 radial depth δ of nozzle ring air discharge duct is determined as 0.005mm through flow test.

In use, two using measured hole minimum and maximum diameter as diameter of bore with Pneumatic measuring head 1 and specially designed A master ring is adjusted according to QFP type floating type air gauge method of adjustment, and pneumatic measuring instrument 2 is adjusted to correct and is closed The position of reason, i.e. the upper and lower limit scale value of 2 graduated scale of pneumatic measuring instrument respectively correspond minimum and maximum diameter master ring；Quilt Gaging hole is generally shallow bore hole or blind hole.

Pneumatic measuring head 1 is put into measured hole, gas pressure when pneumatic measuring instrument 2 is adjusted according to master ring, to work Part measures, and Pneumatic measuring head 1 is slightly rotated a circle in measured hole, and whether the buoy position of observation pneumatic measuring instrument 2 It falls in upper and lower scale value.

If buoy in bound meter full scale, illustrates that tested aperture is qualified；If illustrating not in upper and lower limits Tested aperture is unqualified.Such as need to survey the actual value in tested aperture, it can be according to the amplification factor and scale of the air-gauge of selection The scale that the resolution ratio and buoy of value deviate bound scale value converts, if buoy position deviates the upper limit in range, Then deviation value is subtracted with maximum gauge master ring size；If buoy position deviates lower limit in range, then with minimum diameter school Deviation value is added to ring gauge size.