CN216283163U - Internal thread pitch diameter measuring assembly - Google Patents
Internal thread pitch diameter measuring assembly Download PDFInfo
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- CN216283163U CN216283163U CN202122134115.8U CN202122134115U CN216283163U CN 216283163 U CN216283163 U CN 216283163U CN 202122134115 U CN202122134115 U CN 202122134115U CN 216283163 U CN216283163 U CN 216283163U
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Abstract
The utility model provides an internal thread pitch diameter measuring assembly. The measuring device comprises measuring balls, cushion blocks, springs and an inside micrometer, wherein one measuring ball is arranged on one radial side of a thread tooth socket of an internal thread workpiece to be measured, two measuring balls are arranged on the other radial side of the thread tooth socket of the internal thread workpiece to be measured, and the cushion blocks are in point contact with the two measuring balls; springs are connected in series among the three measuring balls; one end of the inside micrometer is abutted against the cushion block, the other end of the inside micrometer is abutted against the corresponding measuring ball, and the indication value M of the inside micrometer is readInner partThe internal diameter micrometer measures the reading measurement method to indirectly measure the pitch diameter of the internal thread, utilizes trigonometric function formula to deduce, refers to the pitch P of the internal thread, and measures the diameter d of the ball according to the measurement0Converting the pitch diameter D of the internal thread workpiece to be measured2Without using go-stopThe gauge performs the measurement. The utility model indirectly measures the pitch diameter of the internal thread by a reading measurement method. The measuring ball has universality by changing the diameter of the measuring ball, the diameter size of the spring and the inner micrometer measuring rod. The internal thread pitch diameter measuring component is suitable for being used.
Description
Technical Field
The utility model relates to internal thread measurement in the field of machinery, in particular to an internal thread pitch diameter measurement assembly.
Background
At present, the measurement of threads is to control the pitch diameter of the threads so as to ensure the interchangeability of the threads. The traditional thread pitch diameter measuring method is divided into a three-wire measuring method, a standard plug gauge and a spiral gauge measuring method, is a common testing method for judging whether the thread size and the tooth form are qualified or not, and has the advantages of accurate measurement, convenience in use in a production field, high efficiency and the like. However, the three-pin measurement of the pitch diameter of the thread is only performed on the external thread, and the internal thread cannot be measured by using three pins. For the threads with larger diameters and the nominal diameter of more than 240, the plug gauge is adopted for measurement, and the plug gauge is high in manufacture, not universal and heavy in operation.
Disclosure of Invention
The utility model provides an internal thread pitch diameter measuring assembly, which aims to solve the problems that the pitch diameter of an internal thread cannot be measured by three-needle measurement and the problems that the measurement by a screw plug gauge is not universal, high in manufacturing cost and heavy in operation are solved. The assembly obtains an internal thread pitch diameter indirect measurement calculation formula by utilizing trigonometric function formula derivation, and three measurement balls penetrate through a spring, a cushion block and an internal micrometer measurement reading measurement method to indirectly measure the internal thread pitch diameter, so that the technical problem of internal thread pitch diameter measurement is solved.
The technical scheme adopted by the utility model for solving the technical problem is as follows:
an internal thread pitch diameter measuring assembly comprises measuring balls, cushion blocks, springs and an internal micrometer, wherein one measuring ball is arranged on one radial side of a thread tooth socket of an internal thread workpiece to be measured, two measuring balls are arranged on the other radial side of the thread tooth socket of the internal thread workpiece to be measured, and the cushion blocks are in point contact with the two measuring balls; springs are connected in series among the three measuring balls; one end of the inside micrometer is abutted against the cushion block, the other end of the inside micrometer is abutted against the corresponding measuring ball, and the indication value M of the inside micrometer is readInner partThe internal diameter micrometer measures the reading measurement method to indirectly measure the pitch diameter of the internal thread, utilizes trigonometric function formula to deduce, refers to the pitch P of the internal thread, and measures the diameter d of the ball according to the measurement0Converting the pitch diameter D of the internal thread workpiece to be measured2And the measurement is carried out without using a go-no-go gauge.
In order to further solve the technical problem to be solved by the utility model, in the measuring ball provided by the utility model, the measuring ball is a steel ball provided with a connecting spring mounting hole.
Furthermore, the measuring ball is in point contact with and tangent to the thread groove of the internal thread, the measuring point of the measuring ball does not interfere with the large diameter of the external teeth or the small diameter of the internal teeth of the internal thread, and the tangent point can not be separated from the large diameter, d0For measuring the diameter of the ball, d0min<d0< d0max and as close as possible to d0And min is an integer.
The positive effects are as follows: the utility model uses trigonometric function formula to derive to obtain the internal thread pitch diameter indirect measurement calculation formula, three measuring balls penetrate through the spring, the cushion block and the inside micrometer measurement reading measurement method are used for indirectly measuring the internal thread pitch diameter, the internal thread pitch diameter measurement assembly has low manufacturing cost and high measurement precision, and the measurement assembly can be suitable for measuring standard threads and non-standard threads with nominal diameters of 200-1200 by changing the diameter size of the measuring balls and the spring and the inside micrometer measuring rod, and has universality. The internal thread pitch diameter measuring component is suitable for being used.
Drawings
FIG. 1 is a side sectional view of the structure of the present invention;
FIG. 2 is a front view of the structure of the present invention;
FIG. 3 is a schematic diagram of the pitch diameter calculation of the zigzag internal thread of the present invention;
FIG. 4 is a schematic diagram of M value calculation of the pitch diameter of the internal thread;
FIG. 5 shows the maximum value d of the measurement ball diameter0max calculation schematic;
FIG. 6 shows the minimum value d of the measured ball diameter0And (5) a min calculation schematic diagram.
In the figure, 1 is an internal thread workpiece to be measured, 2 is a measuring ball, 3 is a cushion block, 4 is a spring, 5 is an internal micrometer, and D is2For measuring the pitch diameter, M, of the internal thread of the workpiece 1Inner partIs an indication of the inside micrometer, d0For measuring the diameter of the ball, P is the pitch of the internal thread, D2The pitch diameter of the internal thread, M is the measured value of the pitch diameter of the internal thread, and t is the thickness of the cushion block.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
All embodiments, implementations and features of the utility model can be combined with each other in the utility model without contradiction or conflict. In the present invention, conventional devices, apparatuses, components, etc. are either commercially available or self-made according to the present disclosure. In the present invention, some conventional operations and apparatuses, devices, components are omitted or only briefly described in order to highlight the importance of the present invention.
According to the figure, the internal thread pitch diameter measuring assembly comprises measuring balls 2, cushion blocks 3, springs 4 and an internal micrometer 5, wherein one measuring ball 2 is arranged on one radial side of a thread tooth socket of an internal thread workpiece 1 to be measured, two measuring balls 2 are arranged on the other radial side of the thread tooth socket, and the cushion blocks 3 are in point contact with the two measuring balls 2; springs 4 are connected in series among the three measuring balls 2; one end of the inside micrometer 5 is butted with the cushion block 3, the other end is butted with the corresponding measuring ball 2, and the indication value M of the inside micrometer is readInner partThe inside micrometer 5 measures the reading measurement method to indirectly measure the pitch diameter of the internal thread, deduces by using a trigonometric function formula, refers to the pitch P of the internal thread and measures the diameter d of the ball0Converting the pitch diameter D of the internal thread workpiece 1 to be measured2And the measurement is carried out without using a go-no-go gauge.
In order to optimize the structure of the utility model, the measuring ball 2 is a steel ball provided with a mounting hole for a connecting spring 4.
In order to optimize the stability of the structure of the present invention, the spring 4 is a tension spring.
In order to further optimize the structure of the utility model, the measuring ball 2 is in point contact tangent with the thread groove of the internal thread, the measuring point of the measuring ball does not interfere with the large diameter of the external teeth or the small diameter of the internal teeth of the internal thread, and the tangent point can not be separated from the large diameter, d0For measuring the diameter of the ball, d0min<d0< d0max and as close as possible to d0And min is an integer.
As a conventional technical choice, when the thread form of the internal thread workpiece 1 to be measured is GB/T13576.4-2008 saw-tooth (3 degrees and 30 degrees) thread,
Minner part=D2-d0-2ag=D2-d0-2×(1.7119d0-0.7939P)=D2-4.4238d0+1.5878P
d0max=0.6935P
d0min=0.52848P
Measured D2=MInner part+4.4238d0-1.5878P-t
Wherein:
D2the pitch diameter of the thread;
Minner partThe value is indicated by an inside micrometer;
d0to measure the ball diameter;
p is a screw pitch;
and t is the thickness of the cushion block.
Example (b):
the measurement method is exemplified below for serrated threads that are difficult to measure. In the past, the measurement of the sawtooth-shaped internal thread is realized by manufacturing a special go-no go gauge. The measuring method is difficult to measure for the internal thread with larger diameter, the measuring operation of the go-no-go gauge is heavy, and the manufacturing and verification costs of the go-no-go gauge are high. Therefore, the utility model can solve the problems, and the size of the constituent measuring assembly is small, the operation is convenient, and the manufacturing cost is low.
GB/T13576.4-2008 zigzag (3 degrees, 30 degrees) screw thread, the left end face and the right end face of the tooth form are of asymmetric structures, one side of the tooth form is 3 degrees, the other side of the tooth form is 30 degrees, a standard screw plug gauge go-no-go gauge needs to be processed for measuring the screw thread on a production field, and the manufacturing and the measurement are very difficult. In order to solve the inspection problem in the processing and manufacturing, M value calculation formula for measuring the pitch diameter of the sawtooth thread is deduced through research, and the diameter d of a measuring ball is measured0The minimum and maximum values of (c) to achieve a three-ball measurement of the buttress thread.
Measuring the relation between the value of the diameter M and the pitch diameter, the thread form angle and the diameter of the measuring ball: as shown in the schematic view of figure 4,
the Pi Δ oab is a right triangle, ab = P/2, and < aob =30 °
∴ob=P， oa=ab/tan30°=P/2*tan30°=0.866P
< aeo =180 ° - (30 ° +3 °) =147 ° in vane oae
ae/sin30°=oa/sin147°
∴ae=oa*sin30°/sin147°=P*sina30°/2*tan30°*sina147°=0.795P
With a beat Δ def of right triangle, df = d0/2，∠def=1/2(30°+3°)=16.5°
∴de=df/tan16.5°=d0/2*tan16.5°=1.688d0
∴da=de-ae=1.688d0-0.795P
The Ben Delta dfc is a right triangle, and the angle dfc =3 °
∴cd= df*tan3°=d0/2*tan3°=0.0262d0
∴ca=cd+da=0.0262d0+1.688d0-0.795P=1.7142d0-0.795P
The bell delta cag is a right triangle, and the angle cag =3 °
∴ag= ca*cos3°=(1.7142d0-0.795P)xcos3°
=1.7119d0-0.7939P
∴MOuter cover=d2+d0+2ag=d2+d0+2×(1.7119d0—0.7939P)
=d2+4.4238d0-1.5878P
In the same way, the following steps can be obtained:
Minner part=D2-d0-2ag=D2-d0-2×(1.7119d0-0.7939P)
=D2-4.4238d0+1.5878P
Secondly, calculating the maximum value d of the diameter of the measuring ball0max, point C on the outer diameter: as shown in the view of figure 5 of the drawings,
the Pi Δ oab is a right triangle, ab = P/2, and < aob =30 °
∴ob=P，oa=ab/tan30°=P/2*tan30°==0.866P
< aeo =180 ° - (30 ° +3 °) =147 ° in vane oae
In delta oae, ae/sin30 ° = oa/sinl47 ° = oe/sin3 °
∴oe=oa*sin3°/sinl47°=Psin3°/2*tan30°*sinl47°=0.0832P
∴eb=ob-oe=P-0.0832P=0.9168P
ae=oa*sin30°/sin147°=P*sin30°/2*tan30°*sin147°=0.795P
The Ben Delta ehb is a right triangle, and the angle heb =16.5 °
∴hb= eb*tan16.5°=0.2716P
he=hb/sin16.5°=0.2716P/sin16.5°=0.9563P
The pomace Δ acd is a right triangle, the angle cad =3 °, ad = H1/2=0.375P
∴ac=ad/cos3°=0.375P/cos3°=0.3755P
∴ec=ae+ac=0.795P+0.3755P=1.1705P
Bentonium Deltoidea egh and Deltoidea ecf are both right-angled triangles, and < geh = < cef
∴△egh∽△ecf
∴cf/gh=ec/ge ∴cf=gh*ec/ge
Each of the benzodiazepines Δ egh and Δ ebh has a right-angled triangle, gh = bh, eh = eh
∴△egh≌△ebh
∴eb=ge， gh=hb
∴cf=gh*ec/ge= hb*ec /eb=0.2716P×1.1705P/0.9168P=0.3468P
∵cf=d0max/2
∴d0max/2=0.3468P， d0max=2×0.3468P=0.6935P
Thirdly, calculating the minimum value d of the diameter of the measuring ball0And min, setting the measuring point to be flush with the outer diameter and tangent to the left and right tooth surfaces, and then measuring the circle center on an angular bisector of < nvb and < aeb: as shown in the view of figure 6 of the drawings,
the Pi Δ oab is a right triangle, ab = P/2, and < aob =30 °
∴ob=P，oa=ab/tan30°=P/2*tan30°=0.866P
In the case of < aeo =180 ° - (30 ° +3 °) =147 ° and < ae/sin30 ° = oa/sin147 ° with limbus oae
∴ae=oa*sin30°/sin147°=P*sin30°/2*tan30°*sin147°=0.795P
The Ben Delta aec is a right triangle, and the angle aec =3 °
∴ec= ae*cos3°=0.795P×cos3°=0.79391P
∵cs=H1/2=0.375P
∴es=ec+cs=0.79391P+0.375P=1.16891P
The Ben Delta evs is a right triangle, and the angle sve =60 °
∴ev=es/sin60°=1.34974P
Is used for treating diseases caused by < jve =30 DEG and < vej =16.5 DEG in < delta jve °
∴∠ejv=133.5°，ev/sin133.5°=jv/sin16.5°
∴jv=ev*sin16.5°/sin133.5°=0.52848P
The Japanese triangle jnv is a right triangle, angle jvn =30 °, jn = d0min/2
∴d0min=2*jn=jv=0.52848P
The calculation formula of the sawtooth-shaped internal thread is as follows, and all parameters are shown in figure 3.
D2=MInner part+4.4238d0-1.5878P-t
Wherein:
D2the pitch diameter of the thread;
Minner partThe value is indicated by an inside micrometer;
d0for measuring ball alignmentDiameter;
p is a screw pitch;
and t is the thickness of the cushion block.
Fourthly, selecting the diameter of the measuring ball:
the three-ball measurement must not interfere the measuring point of the measuring ball with the large diameter of the external teeth or the small diameter of the internal teeth, or separate the tangent point from the large diameter, so d0min<d0< d0max. In principle, the closer the tangent point is to the pitch diameter, the more precise it is. In addition, d is calculated according to different tooth distances0The value is preferably as close as possible to d0min。
By referring to the calculation method, calculation formulas for measuring internal threads such as triangular threads and trapezoidal threads can be deduced.
The working principle of the utility model is as follows:
the pitch diameter of the thread is a fundamental factor influencing assembly and interchangeability, so the machining and measuring accuracy of the pitch diameter of the thread is particularly important. The conventional method for measuring the pitch diameter of the internal thread has the defects of high manufacturing cost, poor universality and the like of a measuring tool according to different types of measuring tools aiming at standard threads and non-standard threads with nominal diameters of 200 to 1200.
The utility model obtains an internal thread pitch diameter indirect measurement calculation formula by improving an external thread three-wire measurement method and applying trigonometric function formula derivation, and designs a three-ball threading spring wire, a gauge block and an internal micrometer measurement reading measurement method to indirectly measure the internal thread pitch diameter by combining the structural characteristics of the internal thread. The internal thread pitch diameter measuring assembly is low in manufacturing cost and high in measuring precision, can be suitable for measuring standard threads and non-standard threads with nominal diameters ranging from 200 to 1200 by changing the diameter size of the ball, the spring wire and the internal micrometer measuring rod, and has great universality.
The working process of the utility model is as follows:
during measurement, firstly, a measuring ball with a hole is supported in a thread groove of a measured workpiece through a tension spring; then, measuring cushion blocks are additionally arranged on the sides of the two measuring balls with holes at the upper part; then, an inside micrometer is used for measuring the vertical distance between the measuring ball with the lower hole and the measuring cushion block, and the measuring operation is very convenient.
The utility model has the characteristics that:
the utility model mainly solves the measurement of various internal threads with nominal diameters of 200 to 1200, is convenient and flexible in operation compared with plug gauge measurement, has certain universality after replacing a measuring ball with a hole, a tension spring and an inside micrometer measuring rod, and can deduce and measure internal thread calculation formulas such as triangular threads, trapezoidal threads and the like by referring to the calculation method so as to solve the problem of internal thread measurement.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (5)
1. The utility model provides an internal thread pitch diameter measuring subassembly which characterized by: the measuring device comprises measuring balls (2), cushion blocks (3), springs (4) and an inner micrometer (5), wherein one measuring ball (2) is arranged on one radial side of a thread tooth socket of an internal thread workpiece (1) to be measured, the other measuring ball (2) is arranged on the other radial side of the thread tooth socket, and the cushion blocks (3) are in point contact with the two measuring balls (2); springs (4) are connected in series between the three measuring balls (2); one end of the inside micrometer (5) is abutted against the cushion block (3), and the other end is abutted against the corresponding measuring ball (2).
2. An internally threaded pitch diameter measuring assembly as set forth in claim 1, wherein:
the measuring ball (2) is a steel ball provided with a mounting hole for a connecting spring (4).
3. An internally threaded pitch diameter measuring assembly as set forth in claim 2, wherein:
the spring (4) is a tension spring.
4. An internally threaded pitch diameter measuring assembly as set forth in claim 1, wherein:
the measuring ball (2) is in point contact with and tangent to the inner thread tooth socket, the measuring point of the measuring ball does not interfere with the large diameter of the outer teeth or the small diameter of the inner teeth of the inner thread, and the tangent point can not be separated from the large diameter, d0For measuring the diameter of the ball, d0min<d0< d0max and as close as possible to d0And min is an integer.
5. An internally threaded pitch diameter measuring assembly as set forth in claim 1, wherein:
when the tooth form of the internal thread workpiece (1) to be detected is GB/T13576.4-2008 saw-tooth (3 degrees and 30 degrees) thread,
Minner part=D2-d0-2ag=D2-d0-2×(1.7119d0-0.7939P)=D2-4.4238d0+1.5878P；
d0min<d0< d0max, wherein d0max=0.6935P，d0min=0.52848P；
Measured D2=MInner part+4.4238d0-1.5878P-t；
Wherein: d2The pitch diameter of the thread; mInner partThe value is indicated by an inside micrometer; d0To measure the ball diameter; p is a screw pitch; and t is the thickness of the cushion block.
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| CN202122134115.8U CN216283163U (en) | 2021-09-06 | 2021-09-06 | Internal thread pitch diameter measuring assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122134115.8U CN216283163U (en) | 2021-09-06 | 2021-09-06 | Internal thread pitch diameter measuring assembly |
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