Measurement tool of minor diameter of MJ outer screw and measurement method of minor diameter of MJ outer screw employing the same
A technology for measuring tools and external threads, applied in the direction of mechanical diameter measurement, etc., can solve the problems of easy wear and tear of measuring tools, large measurement errors, affecting production efficiency, etc., and achieve the effects of convenient measurement, high work efficiency and simple structure
Inactive Publication Date: 2016-02-24
LANDING GEAR ADVANCED MFG
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Problems solved by technology
Therefore, to measure the small diameter of MJ external thread, the spherical radius of the measuring end of the measuring tool must match the radius of the thread root. If it is too large, it will not be in close contact with the thread root, resulting in too large measurement error. If it is too small, the measuring tool will be easily worn.
[0003] At present, in the production sites of most enterprises, the plastic variable can be measured by measuring tools such as projection method or microscope, but there is still no suitable measuring tool that can quickly measure the small diameter of the external thread to calculate the plastic variable after thread rolling strengthening. Seriously affect production efficiency
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[0031] A small-diameter measuring tool for MJ external threads, which is used to measure the plastic variable after MJ thread rolling and strengthening, it adds a single measuring head and a double measuring head on the basis of the outer spiral pitch micrometer; the single measuring head and double measuring head The head has one arc surface and two arc surfaces at the measuring end, the arc radius R1=(R′-0.03mm)~R′, R2=0.15~0.18mm; the single probe and double probe There are one cone surface and two cone surfaces respectively, and the angle of the cone surface α1=α2=30°; the center distance L of the circular arc surface of the double probe is equal to the pitch P of the external thread to be tested, that is, L=P, to ensure that the The bottom of the arc surface can be in correct contact with the bottom of the external thread to be tested; the arc surfaces of the single probe and the double probe are tangent to their respective cone surfaces; the single probe and the double pr...
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The present invention discloses a measurement tool of a minor diameter of an MJ outer screw and a measurement method of a minor diameter of an MJ outer screw employing the same. The measurement tool provided by the invention comprises an outer diameter screw micrometer, a single probe and a double probe; the measurement end of the single probe is provided with a taper surface, the measurement end of the double probe is provided with two taper surfaces, and the tops of all the taper surfaces are arc surfaces, wherein the distance between the centers of two arc surfaces of the double probe is L; the arc surface of the single probe and the two arc surfaces of the double probe are respectively contacted with roots of two adjacent outer screws of a part at measurement; and the distance between the midpoints of connection lines between the outer end of the arc surface of the single probe and the outer ends of the two arc surfaces of the double probe is the minor diameter of the outer screw of the part. According to the invention, the structure is simple, the measurement is convenient and the work efficiency is high.
Description
technical field [0001] The invention relates to an MJ external thread small diameter measuring tool and a measuring method, belonging to the technical field of thread detection of metal parts. Background technique [0002] Threaded fasteners are one of the most common structural parts in mechanical parts. The control of the pitch diameter and top diameter of the thread is a key element in the manufacturing process. Therefore, when testing, it is also mainly to measure the pitch diameter and top diameter of the thread. Diameter, such as: thread micrometer is a measuring tool specially used to measure the pitch diameter of thread. In the aspect of surface integrity control in the field of mechanical manufacturing, the anti-fatigue manufacturing of threaded parts is one of the key manufacturing technologies. For the MJ thread (reinforced thread) of ultra-high-strength steel parts, it is usually realized by thread rolling strengthening, and in An important index to measure the ...
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IPC IPC(8): G01B5/08
CPCG01B5/08
Inventor 张志刚翟甲友胡阿林鱼增学
Owner LANDING GEAR ADVANCED MFG