CN2864578Y - High accuracy measuring tool for non-holonomy inner circle - Google Patents

Abstract

The utility model belongs to the measuring technique; relating to the improvement of the component incomplete inner circle measuring apparatus. The utility model includes a dial gauge; and the utility model is characterized in that the apparatus is provided with a trapezoidal measuring apparatus body 1, a center hole of the trapezoid is provided with the gauge clip 2, a place below the center hole is provided with a movable measuring pin 4, the two sides of the measuring apparatus body are provided with a fixed measuring pins 7. The utility model can quickly measure the incomplete inner circle in field, reduce the processing tolerance and the labor strength, improve the production efficiency, and also reduce the production cost.

Description

The non-complete interior circle measuring tool of a kind of high precision

Technical field

The utility model belongs to measuring technique, relates to the improvement to the non-complete interior circle measurement mechanism of part.

Background technology

In some gear casees, bearing seat, cylinder body part, often can run into the processing and the detection of the higher non-complete circle of some accuracy requirements.In the part production run, the size of non-complete circle can't realize on-line measurement, and common measuring method is part to be processed to be taken off with three coordinate measuring machine from lathe detect.The shortcoming of doing like this: the one, the repeated clamping part causes the consistance of machining benchmark bad easily, makes mismachining tolerance increase; The 2nd, labor strength is big, has reduced production efficiency, has increased the processing cost of product.

Summary of the invention

The purpose of this utility model is: propose a kind of can the production and processing on-site rapid measurement non-complete in the circle survey instrument, only need a clamping parts, just can measure fast and accurately, to reduce mismachining tolerance while processing, reduce labour intensity, enhance productivity.

The technical solution of the utility model is: the non-complete interior circle measuring tool of a kind of high precision, comprise a dial gauge or clock gauge, it is characterized in that, a measuring tool body 1 is arranged, it is a plate with adequate thickness, the profile of this plate is that the inversion of a symmetry is trapezoidal, there is one to run through the stepped hole of going to the bottom on trapezoidal at this trapezoidal center, the upper diameter of this stepped hole is big, be opened on trapezoidal long upper base center, the lower diameter of this stepped hole is little, be opened on the trapezoidal short center of going to the bottom, a table folder 2 that has table folder nut is installed on the top of stepped hole, dial gauge or clock gauge 3 are installed in the table folder 2, a movable pin 4 of measuring is arranged in the bottom of stepped hole, its upper end has back-up ring 5, the diameter of back-up ring 5 is less than the stepped hole upper diameter, greater than its underpart diameter, between the lower surface of back-up ring 5 and table folder 2, spring 6 is arranged, the measuring contacts of dial gauge or clock gauge 3 contacts with the upper surface of back-up ring 5, movable diameter and aperture, the stepped hole bottom sliding fit of measuring pin 4, stretch out from the lower port of stepped hole its lower end, on the both sides of measuring tool body 1 are trapezoidal side, a fixation measuring pin 7 is arranged respectively, the center line symmetry and the coplane of the relative stepped hole of axis of two fixation measuring pins 7, the angle of the axis of fixation measuring pin 7 and stepped hole center line is α, and the span at α angle is 60 ° ± 15 °.

The utility model has the advantages that: can the production and processing on-site rapid measurement non-complete in the survey instrument of circle, only need a clamping parts, just can measure fast and accurately while processing, reduced mismachining tolerance, reduce labour intensity, improved production efficiency, reduced cost of goods manifactured.

Description of drawings

Fig. 1 is the structural representation of measuring tool of the present invention.

Fig. 2 is the measuring principle synoptic diagram of measuring tool of the present invention.

Embodiment

Below the utility model is described in further details.Main design philosophy of the present utility model is a fundamental theorem of determining a circle according to 3, adopts the method for standard component his-and-hers watches relative measurement, realizes measuring indirectly the purpose of tested part arc size.Referring to Fig. 1, non-complete interior circle measuring tool of the present utility model, comprise a dial gauge or clock gauge, it is characterized in that, a measuring tool body 1 is arranged, it is a plate with adequate thickness, the profile of this plate is that the inversion of a symmetry is trapezoidal, there is one to run through the stepped hole of going to the bottom on trapezoidal at this trapezoidal center, the upper diameter of this stepped hole is big, be opened on trapezoidal long upper base center, the lower diameter of this stepped hole is little, be opened on the trapezoidal short center of going to the bottom, a table folder 2 that has table folder nut is installed on the top of stepped hole, dial gauge or clock gauge 3 are installed in the table folder 2, a movable pin 4 of measuring is arranged in the bottom of stepped hole, its upper end has back-up ring 5, the diameter of back-up ring 5 is less than the stepped hole upper diameter, greater than its underpart diameter, between the lower surface of back-up ring 5 and table folder 2, spring 6 is arranged, the measuring contacts of dial gauge or clock gauge 3 contacts with the upper surface of back-up ring 5, movable diameter and aperture, the stepped hole bottom sliding fit of measuring pin 4, stretch out from the lower port of stepped hole its lower end, on the both sides of measuring tool body 1 are trapezoidal side, a fixation measuring pin 7 is arranged respectively, the center line symmetry and the coplane of the relative stepped hole of axis of two fixation measuring pins 7, the angle of the axis of fixation measuring pin 7 and stepped hole center line is α, the span at α angle is 60 ° ± 15 °.By mathematical analysis, when α=60 °, the difference basically identical of the reading value of table and standard component R and measured part Rx, its error is about ten thousand/millimeter.Therefore, the α angle of measuring tool is controlled at 60 °, so that judge more quick and precisely whether the accessory size tolerance is qualified.Recommending the angle α that adopts is 60 °.

The thickness of measuring tool body 1 is 20～30mm.Under the prerequisite of guaranteeing measuring tool intensity and the convenient use of weight reduction as far as possible, determine according to the size of installation parts and the requirement of measured part.

Referring to Fig. 2.When the survey instrument of the non-complete circle of design high precision, the mathematical knowledge of utilization plane trigonometry according to 3 axioms of determining a circle, is derived formula of mathematical earlier, then mathematical model is transformed into the survey instrument of actual use.

Δ is represented the actual deviation of measured part arc radius, can embody with the variation of dial gauge (clock gauge) tabular value;

R represents the bulb radius of fixation measuring pin 7;

R represents the real radius value of standard component, can realize with positioning contact;

Rx represents the radius value of measured part circular arc;

α represents fixation measuring pin 7 and the movable angle of measuring between the pin 4.

Analysis and calculating by to the mathematics calculating chart can draw following computing formula:

$\mathrm{\&Delta;}=\mathrm{Rx}-R+(R-r)\cos \mathrm{\&alpha;}-\sqrt{{(\mathrm{Rx}-r)}^2-{(R-r)}^2{\mathrm{<figure-callout\; id="2"\; label="sin"\; filenames="Y20052012792900061.png"\; state="\{\{state\}\}">sin</figure-callout>}}^2\mathrm{\&alpha;}}$

Promptly set up the relational expression between dial gauge (clock gauge) reading value and the tested part circular arc actual value.During measurement, according to the given α angle of measuring tool, the r radius value, the given R real radius of standard component value by meter reading value Δ and above-mentioned relation formula, just can be determined tested part circular arc real radius value.

Using method of the present utility model is: this survey instrument is answered Control Radius r during fabrication, angle [alpha], and standard component is answered the dimensional tolerence of Control Radius R.Earlier measuring tool is placed on the standard component during use, dial gauge (clock gauge) is adjusted to zero-bit, and then measuring tool is placed on the measured part, determine tested part circular arc real radius value according to the reading value Δ of dial gauge (clock gauge), judge that whether qualified tested part is.

Claims (3)

1, the non-complete interior circle measuring tool of a kind of high precision, comprise a dial gauge or clock gauge, it is characterized in that, a measuring tool body [1] is arranged, it is a plate with adequate thickness, the profile of this plate is that the inversion of a symmetry is trapezoidal, there is one to run through the stepped hole of going to the bottom on trapezoidal at this trapezoidal center, the upper diameter of this stepped hole is big, be opened on trapezoidal long upper base center, the lower diameter of this stepped hole is little, be opened on the trapezoidal short center of going to the bottom, a table folder [2] that has table folder nut is installed on the top of stepped hole, dial gauge or clock gauge [3] are installed in the table folder [2], a movable pin [4] of measuring is arranged in the bottom of stepped hole, its upper end has back-up ring [5], the diameter of back-up ring [5] is less than the stepped hole upper diameter, greater than its underpart diameter, between the lower surface of back-up ring [5] and table folder [2], spring [6] is arranged, the measuring contacts of dial gauge or clock gauge [3] contacts with the upper surface of back-up ring [5], movable diameter and aperture, the stepped hole bottom sliding fit of measuring pin [4], stretch out from the lower port of stepped hole its lower end, on the both sides of measuring tool body [1] are trapezoidal side, a fixation measuring pin [7] is arranged respectively, the center line symmetry and the coplane of the relative stepped hole of axis of two fixation measuring pins [7], the axis of fixation measuring pin [7] and the angle of stepped hole center line are α, and the span at α angle is 60 ° ± 15 °.

2, non-complete interior circle measuring tool according to claim 1 is characterized in that said angle α is 60 °.

3, non-complete interior circle measuring tool according to claim 1 and 2 is characterized in that the thickness of said measuring tool body [1] is 20～30mm.

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