CN116295201A - Method for detecting pitch diameter of internal thread by profilometer - Google Patents
Method for detecting pitch diameter of internal thread by profilometer Download PDFInfo
- Publication number
- CN116295201A CN116295201A CN202310185626.3A CN202310185626A CN116295201A CN 116295201 A CN116295201 A CN 116295201A CN 202310185626 A CN202310185626 A CN 202310185626A CN 116295201 A CN116295201 A CN 116295201A
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- Prior art keywords
- thread
- diameter
- profiler
- internal thread
- detecting
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/10—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters
- G01B21/14—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters internal diameters
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses a method for detecting the pitch diameter of an internal thread by a profiler, which comprises the following steps: s1, placing a detected internal thread workpiece on a profiler, and detecting a thread profile according to a normal operation program of the profiler; s2, measuring the diameter d of the measuring needle by using a measuring needle method 0 The method comprises the steps of carrying out a first treatment on the surface of the S3, drawing a diameter d on the measured outline 0 The circles tangent to the two sides of the thread groove are measured, and the difference value between the tangent circles and the minor diameter of the thread is averaged to obtain an average value H; s4, obtaining a measuring needle measured value M according to the minor diameter of the thread; s5, according to the measuring value M of the measuring needle and the pitch diameter D of the thread 2 Calculating the pitch diameter D of the internal thread 2 . The detection method is not only suitable for detecting the pitch diameter of the internal thread, but also suitable for detecting the external thread, and the high-precision and high-efficiency detection of the profiler improves the detection precision and efficiency. The pitch diameter of the internal thread can be detected by the profiler, so that the cost of using the thread comprehensive measuring instrument is reduced.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a method for detecting the pitch diameter of an internal thread by a profiler.
Background
The threads are classified into triangular threads, rectangular threads, trapezoidal threads, zigzag threads, etc. according to their sectional shapes (teeth). Wherein triangular threads are mainly used for connection (see thread connection), and rectangular, trapezoidal and zigzag threads are mainly used for transmission. Pitch diameter is an important indicator for checking whether a precision thread is acceptable. For general standard threads, a thread ring gauge or a plug gauge is adopted for measurement, but only whether the threads are qualified or not can be judged, and the specific value of the pitch diameter of the threads cannot be measured; the screw micrometer adopts a three-needle method to measure the pitch diameter of the external screw thread, and the internal screw thread can not be used for placing the measuring needle or the steel ball, in particular the screw thread with smaller screw pitch, so the screw micrometer is not suitable for directly using the measuring needle to measure the pitch diameter by the three-needle method; the comprehensive thread measuring instrument can automatically detect comprehensive parameters of internal and external threads, but has single function and high cost, and is only suitable for professional measuring tool manufacturers. The profilometer is used for measuring the profile sizes of various products and parts, and has high precision and wide application.
Disclosure of Invention
The invention aims to provide a method for detecting the pitch diameter of an internal thread by a profiler, which aims to solve the problems that the common detection in the prior art cannot detect the pitch diameter of the internal thread and the detection cost is high by using a thread comprehensive measuring instrument.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a method for detecting the pitch diameter of an internal thread by a profiler, which comprises the following steps:
s1, placing a detected internal thread workpiece on a profiler, and detecting a thread profile according to a normal operation program of the profiler;
s2, measuring the diameter d of the measuring needle by using a measuring needle method 0 ；
S3, drawing a diameter d on the measured outline 0 The circles tangent to the two sides of the thread groove are measured, and the difference value between the tangent circles and the minor diameter of the thread is averaged to obtain an average value H;
s4, obtaining a measuring needle measured value M according to the minor diameter of the thread;
s5, according to the measuring value M of the measuring needle and the pitch diameter D of the thread 2 Calculating the pitch diameter D of the internal thread 2 。
Further, the gauge pin diameter d 0 Calculated from the following formula:
wherein:
is a tooth-shaped half angle, °; p is thread pitch, mm.
Further, the gauge needle measurement value M is calculated by the following formula:
M＝D 1 -2H
wherein: d (D) 1 The diameter of the thread measured by the vernier caliper is small, and the diameter is mm; h is the average value of the difference between the tangent circle and the minor diameter of the thread, and mm.
Further, the thread pitch diameter D 2 Calculated from the following formula:
wherein: m is the measurement value of the measuring needle, and mm; d, d 0 The diameter of the measuring needle is mm;
is a tooth-shaped half angle, °; p is thread pitch, mm.
Further, in the step S3, at least 3-5 tangent circles are drawn to ensure the detection accuracy when the tangent circles are drawn.
Based on the technical scheme, the embodiment of the invention at least has the following technical effects:
the detection method is not only suitable for detecting the pitch diameter of the internal thread, but also suitable for detecting the external thread, and the high-precision and high-efficiency detection of the profiler improves the detection precision and efficiency. The pitch diameter of the internal thread can be detected by the profiler, so that the cost of using the thread comprehensive measuring instrument is reduced.
Drawings
FIG. 1 is a schematic view of the structure of a profiler according to embodiment 1 of the present invention 1;
FIG. 2 is a schematic view of the structure of the profiler according to embodiment 1 of the present invention 2;
FIG. 3 is a view of a thread profiler according to example 1 of the present invention;
FIG. 4 is a schematic view of the internal thread of example 1 of the present invention;
FIG. 5 is a graph showing the measurement of the thread diameter and the height H of the gauge needle according to example 1 of the present invention;
FIG. 6 is a schematic representation of a measuring needle measurement method according to example 1 of the present invention;
in the figure: 1. an X1 axis; 2. a detector; 3. a Z2 axis upright post; 4. a Y-axis workbench; 5. an alpha axis; 6. and a beta axis.
Detailed Description
The invention provides a method for detecting the pitch diameter of an internal thread by a profiler, which comprises the following steps:
s1, placing a detected internal thread workpiece on a profiler, and detecting a thread profile according to a normal operation program of the profiler;
s2, measuring the diameter d of the measuring needle by using a measuring needle method 0 ；
S3, drawing a diameter d on the measured outline 0 The circles tangent to the two sides of the thread groove are measured, and the difference value between the tangent circles and the minor diameter of the thread is averaged to obtain an average value H;
s4, obtaining a measuring needle measured value M according to the minor diameter of the thread;
s5, according to the measuring value M of the measuring needle and the pitch diameter D of the thread 2 Calculating the pitch diameter D of the internal thread 2 。
Diameter d of the measuring needle 0 Calculated from the following formula:
wherein:
is a tooth-shaped half angle, °; p is thread pitch, mm.
The gauge needle measurement value M is calculated by the following formula:
M＝D 1 -2H
wherein: d (D) 1 The diameter of the thread measured by the vernier caliper is small, and the diameter is mm; h is the average value of the difference between the tangent circle and the minor diameter of the thread, and mm.
The pitch diameter D of the thread 2 Calculated from the following formula:
wherein: m is the measurement value of the measuring needle, and mm; d, d 0 The diameter of the measuring needle is mm;
is a tooth-shaped half angle, °; p is thread pitch, mm.
The following detailed description refers to the accompanying drawings.
Example 1
The structure of the profiler is shown in figures 1 and 2, a detected internal thread workpiece is placed on the profiler, and the thread profile is detected according to the normal operation program of the profiler, as shown in figure 3;
needle measurement, as shown in FIG. 6, calculates the diameter d of the needle 0 The method comprises the steps of carrying out a first treatment on the surface of the Taking 2 1/4-20UN-2B internal thread as an example, the thread pitch P is 1.27, the tooth angle is 60 degrees, and the diameter d of the measuring needle is measured 0 ＝0.732；
As shown in FIG. 4, a diameter d is drawn on the measured outline 0 As shown in fig. 5, the difference between the tangent circle and the minor diameter of the thread is averaged to obtain an average value H, h=1/5 (0.2459+0.2473+0.2438+0.2489+0.2472) = 0.24662; screw thread small diameter measured by vernier caliperD1 is 55.89
Obtaining a measuring needle measured value M according to the minor diameter of the thread; m=d 1 -2H＝55.89-2*0.2466＝55.3968
According to the relation between the measuring needle measured value M and the thread pitch diameter D2, calculating the internal thread pitch diameter D2:
D2＝M+3d 0 -0.866P＝55.3968+3*0.732-0.866*1.27＝56.49
the drawing requires the pitch diameter of the screw thread to be 56.4-56.55, so that the detection result meets the requirement.
To verify the feasibility of the test, a standard threaded plug gauge (external thread) was used for the test verification. The standard thread plug gauge is provided with a detection report of special detection tools when leaving the factory, and the major parameter thread pitch diameter of the standard thread plug gauge can be detected by using a three-needle detection method by using an actual measuring needle, and then the pitch diameter of the plug gauge thread is detected by using a profiler, so that the error does not exceed 0.008mm. Thereby demonstrating the feasibility of this measurement method.
Claims (5)
1. A method for detecting the pitch diameter of an internal thread by a profiler, comprising the steps of:
s1, placing a detected internal thread workpiece on a profiler, and detecting a thread profile according to a normal operation program of the profiler;
s2, measuring the diameter d of the measuring needle by using a measuring needle method 0 ；
S3, drawing a diameter d on the measured outline 0 The circles tangent to the two sides of the thread groove are measured, and the difference value between the tangent circles and the minor diameter of the thread is averaged to obtain an average value H;
s4, obtaining a measuring needle measured value M according to the minor diameter of the thread;
s5, according to the measuring value M of the measuring needle and the pitch diameter D of the thread 2 Calculating the pitch diameter D of the internal thread 2 。
2. The method for detecting the pitch diameter of an internal thread by a profiler as set forth in claim 1, whereinCharacterized in that the diameter d of the measuring needle 0 Calculated from the following formula:
wherein:
is a tooth-shaped half angle, °; p is thread pitch, mm.
3. A method for detecting the pitch diameter of an internal thread according to claim 1, wherein the gauge needle measurement M is calculated from the following formula:
M＝D 1 -2H
wherein: d (D) 1 The diameter of the thread measured by the vernier caliper is small, and the diameter is mm; h is the average value of the difference between the tangent circle and the minor diameter of the thread, and mm.
4. A method for detecting the pitch diameter of an internal thread by a profiler as set forth in claim 1, wherein said pitch diameter D 2 Calculated from the following formula:
wherein: m is the measurement value of the measuring needle, and mm; d, d 0 The diameter of the measuring needle is mm;
is a tooth-shaped half angle, °; p is thread pitch, mm.
5. The method for detecting pitch diameter of internal thread according to claim 1, wherein at least 3-5 tangent circles are drawn in step S3 to ensure the detection accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310185626.3A CN116295201A (en) | 2023-03-01 | 2023-03-01 | Method for detecting pitch diameter of internal thread by profilometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310185626.3A CN116295201A (en) | 2023-03-01 | 2023-03-01 | Method for detecting pitch diameter of internal thread by profilometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116295201A true CN116295201A (en) | 2023-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310185626.3A Pending CN116295201A (en) | 2023-03-01 | 2023-03-01 | Method for detecting pitch diameter of internal thread by profilometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116295201A (en) |
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2023
- 2023-03-01 CN CN202310185626.3A patent/CN116295201A/en active Pending
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