CN2122373U

CN2122373U - Thread Pitch Diameter Measuring Instrument

Info

Publication number: CN2122373U
Application number: CN 90227014
Authority: CN
Inventors: 彭贤会
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-12-30
Filing date: 1990-12-30
Publication date: 1992-11-18

Abstract

The pitch diameter measuring instrument is designed and manufactured according to a method for measuring pitch diameter of threads by a two-ball method. The method is suitable for measuring the pitch diameter of the threads when a machine tool processes the threads or an inspector measures and tests personnel to detect batches of threads and thread gauges.

The measuring instrument is suitable for metric system, imperial system, ladder type screw thread and the like. The pitch diameter of the thread can be measured with or without a ring gauge. The feed amount is known when the thread is machined, the thread is not limited by the size of a helix angle, the thread with the increased pitch diameter is suitable, various precision grades can be measured, and the direct measurement error is about 10 mu m when the comparison measurement is basically the same as the three-pin measurement. Compared with the three-needle and ring gauge detection speed, the detection speed is obviously improved. Every 25mm of the instrument, 500mm can be measured.

Description

Pitch diameter admeasuring apparatus

The utility model relates to a kind of measurement instrument, is used for the externally threaded pitch diameter of thread measuring instrument of machine tooling.

At present, the high employing three pin mensurations of measuring accuracy in footpath in the external thread, medium and low precision adopts ring thread gage integration measurement method and screw-thread micrometer to measure.Three pin measuring accuracy height, but measure relatively difficulty at processing site.The ring thread gage composite measurement has its distinct advantages, and pitch, tooth form angle, middle footpath can both check simultaneously, but its limitation is arranged, all size size in other words, and the many phenomenons of quantity appear in indispensable one pair of various accuracy classes.The screw-thread micrometer measurement range is big, but its measuring error is also big, and its error is the 0.1-0.18 millimeter.

The purpose of this utility model provides a kind of pitch diameter of thread measuring instrument, and it not only is suitable for the screw thread of high, medium and low accuracy class, and can carry out the pitch diameter of thread at processing site and measure.

The purpose of this utility model is achieved in that the method that adopts two balls to measure the pitch diameter of thread.It is by support, ball-type gauge head, activity measurement axis, derivator.The ball-type gauge head is installed in movable the survey on axle and the derivator respectively.When moving up and down movable survey axle, fork is directly delivered to dial gauge (clock gauge, inductance instrument), the deviation size of reading measured piece from dial gauge.Backstay is when the measure batch screw element, is used for limiting the measured piece position.Can be fixed on the support in order to make the testing staff measure the convenient annex that increases, and be installed in and carry out the measure batch screw element on the common micrometer stand.The utility model measurement range can, can measure in the 500mm the amount instrument every 25mm one, 20 specifications from 0-25mm totally.

Because adopt such scheme, pitch diameter of thread measuring instrument can be used for metric system, English system and acme thread.All can measure the pitch diameter of thread having or not under the situation of ring thread gage, know the depth of cut during machining screw, be not subjected to the restriction of helix angle size, the screw thread that the footpath is strengthened in being suitable for, can survey various accuracy classes, compare and measure and measure basic identically with three pins, directly measuring its measuring error maximum error in the 100mm scope is 15um.Compare on detection speed with three pin ring thread gages and to be significantly improved.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the structural map of the embodiment of pitch diameter of thread measuring instrument.

Fig. 2 is the utility model schematic diagram.

Among the figure 1, support 2, dial gauge (clock gauge, inductance instrument) 3, ball-type gauge head 4, derivator 5, backstay 6, fork 7, movable axle 8, annex 9, fork power bar 10, spring 11, the measured piece surveyed

In the embodiment shown in fig. 1, support (1), dial gauge (clock gauge, inductance instrument) (2), ball-type gauge head (3), derivator (4), the movable axle (7) of surveying is the utility model major part.Ball-type gauge head (3) is installed in movable the survey on axle (7) and the derivator (4) respectively.Drive fork power bar (9) when fork (6) moves, make the movable axle (7) of surveying under the effect of spring (10), the deviation size that moves up and down and be directly delivered to dial gauge (clock gauge, inductance instrument) (2) and read measured piece (11).Backstay (5) is to be used for limiting the measured piece position when the measure batch screw thread.Can be fixed on the support (1) for the testing staff being measured conveniently increased annex (8), and be installed in and carry out the measure batch screw element on the common micrometer stand.The utility model can be measured with footpath in comparative measurement method and the direct method of measurement double thread.

Comparative measurement method: the standard thread of using the known middle footpath of same specification size is determined the margin tolerance of tested screw thread then to good dial gauge (clock gauge, inductance instrument) zero-bit.Standard thread determines according to the product precision, for precision lower can be with the product in the processing, adjust pitch diameter of thread measuring instrument zero-bit with the three pins measured value of fixing a point.

The direct method of measurement: at first adjust pitch diameter of thread measuring instrument zero-bit (lower limit), derivator is fixed on the M size, and determine the margin tolerance of tested screw thread.

In Fig. 2 the utility model schematic diagram, the M that records with the ball-type gauge head is the inside dimensions of ball-type gauge head, and therefore middle footpath is:

d_{2} = \sqrt{{(M + d_{o})}^{2} - \frac{t^{2}}{4}} - \frac{d_{o}}{\sin (a / 2)} + \frac{t}{2 tg (a / 2)}

And (1)

M = \sqrt{{(d_{2} + \frac{d_{o}}{\sin (a / 2)} - \frac{t}{2 tg (a / 2)})}^{2} + \frac{t^{2}}{4}} - d_{o}

（2）

In the formula: d ₂-the pitch diameter of thread (burying the opinion value): d ₀-ball-type gauge head diameter; T-pitch.

This is novel greater than the above measurement lower limit size of 25mm, adjusts with outside micrometer par or slip gauge.Can calculate the needed M value of all size table according to formula (2), use when being convenient to measure.

The utility model pitch diameter of thread measuring instrument measurement range, ball-type gauge head diameter and suitable pitch see the following form.

The mm of unit

Claims

1, a kind of pitch diameter of thread measuring instrument is characterized in that by support (1); Dial gauge (clock gauge, inductance instrument) (2); Ball-type gauge head (3); Derivator (4); Backstay (5); Fork (6); The movable axle (7) of surveying; Annex (8) is formed.

2, the measurement range according to right 1 described pitch diameter of thread measuring instrument can the amount instrument, can measure 500mm with interior totally 20 specifications every 25mm one from 0-25mm.