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Method and device for measuring pitch diameter of external thread

A measuring device and external thread technology, which is applied in the field of worm measurement and measuring the pitch diameter of external threads, can solve the problems of low measurement efficiency and achieve the effects of strong versatility, novel structure and small volume

Inactive Publication Date: 2016-02-03
CNGC JILIN DONGGUANG GRP
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Problems solved by technology

[0004] The invention provides a method and device for measuring the pitch diameter of external threads to solve the problem of low measurement efficiency in the prior art

Method used

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  • Method and device for measuring pitch diameter of external thread
  • Method and device for measuring pitch diameter of external thread

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Embodiment Construction

[0018] Include the following steps:

[0019] (1) Choose three needles:

[0020] Using the two parameters of the measured thread pitch and the measured thread pressure angle, the primary three-needle diameter value dprimary is obtained through calculation, dprimary=sec(α / 2) P / 2, where: P is the thread pitch, α is the thread pressure angle, and then compared with the complete set of standard three needles, select a set of three needles that is closest to the calculated diameter of the three needles;

[0021] (2) Use the measuring device to measure the three-pin value M of the external thread;

[0022] (3) To calculate the pitch diameter D of the external thread, the calculation formula is:

[0023] D=M-d[1+1 / sin(α / 2)]+P / 2·cot(α / 2), where: M is the value of the three needles of the thread, and d is the diameter of the selected three needles.

[0024] The structure of the measuring device of the present invention is: the fixed support 2 is fixedly connected with the base 1, the...

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Abstract

The invention relates to a method and a device for measuring the pitch diameter of an external thread, and belongs to the technical field of analysis and measurement control. The method comprises the steps of selecting three pins, measuring the three-pin value and calculating the pitch diameter of an external thread. A fixed bracket is fixedly connected with a base. The base is provided with a slide slot, and a mobile bracket is in sliding connection with the slide slot through a guide rib. The base is further provided with a guide slot. The top ends of the fixed bracket and the mobile bracket are each provided with a placement slot, and the directions of the placement slots are consistent with the axis of the fixed bracket. Adjusting seats are respectively provided with an avoiding slot in the bottom, and the adjusting seats are connected with the base through screws and disposed at the two sides of the fixed bracket. A circular magnetic sheet is attached to a side, near the fixed bracket, of each adjusting seat. A measuring scale bracket is fixedly connected with the base. The measuring ruler bracket is provided with a scale insertion slot in which a measuring scale is inserted. The advantages are as follows: the measuring method is simple; the measuring device has the characteristics of small size, low cost, novel structure, flexible operation and high universality; and the measuring accuracy and work efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of analysis and measurement control, and in particular relates to a method and device for measuring the pitch diameter of external threads, which are suitable for measuring worms. Background technique [0002] For metric threads and American threads, both thread profile angles are 60°, which can be directly measured with a thread pitch micrometer; but if there is no thread pitch micrometer, and for imperial threads (profile angle 55°) , trapezoidal thread (tooth angle metric 30°, American system and British system 29°), worm, etc., the pitch diameter measurement is very difficult. At this time, it is necessary to measure the pitch diameter of the thread with the three-needle measurement method. [0003] Three-needle measurement of thread pitch diameter is an indirect method of measuring pitch diameter. It is to place three measuring needles with high precision and the same diameter in the tooth groove of th...

Claims

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Application Information

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IPC IPC(8): G01B5/08
Inventor 王博陈俊于菁玫原兴国张哲群曹云旗刘振伟
Owner CNGC JILIN DONGGUANG GRP
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