CN201083485Y - Ceramic lock pin interior diameter / concentricity measuring apparatus V -type trough - Google Patents

Abstract

The utility model discloses a V-shaped groove for use in a ceramic core diameter/concentricity measuring apparatus, consisting of two small V-shaped grooves on the same axial line, wherein, an eyelet is arranged on each of four groove faces of the two small V-shaped grooves; jewel balls which have the same diameter as the eyelets are embedded into the eyelets; the eyelets and the jewel balls are closely matched with each other and fixed through epoxy adhesives; measured ceramic core outside diameter are kept in point contact with outside diameters of the jewel balls; ratio of the outside diameter of the jewel balls to the diameter of the measured ceramic core is 0.38 to 1.25. The utility model has the advantages that: the diameters of the jewel balls and the eyelets are the same, and the height of the jewel balls is easier to control when glued; the aim of selecting small jewel balls is to allow an excircle of a ceramic core to be in point contact with the surface of the jewel balls more easily, and the measurement of the inside diameter and concentricity can be performed well to the prior pins in various outside diameters, thereby the scope of application of measuring products is greatly enlarged. Moreover, novel equipment is unnecessary to be purchased by spending a great deal of money, and the capacity of the utility model in dealing with market product change is obviously strengthened.

Description

V-type groove in ceramic insertion core internal diameter/concentricity measurement mechanism

Technical field

The utility model relates to a kind of measurement mechanism that is used for the internal diameter/concentricity of optical-fibre communications connector ceramic insertion core, specifically is meant the V-type groove in the measurement mechanism.

Background technology

According to the technical stipulation of IEC61300-3-25, the measurement of ceramic insertion core internal diameter and concentricity must be that benchmark rotates 180 ° with its external diameter, and the range deviation of measuring between its center of circle, inside and outside footpath obtains concentricity.Because internal diameter is too little, internal diameter has only 5% of external diameter, has only 125 μ m usually, and measuring accuracy must reach 0.1 μ m, and this just requires the precision of V-type groove of measuring placement ceramic insertion core also quite high.For improving measuring accuracy, Tokyo aviation gauge Co., Ltd. adopts pastes diamond chip in the V-type groove, and ceramic insertion core contacts with the diamond chip retention wire.Because when measuring, ceramic insertion core needs to rotate 180 ° in the V-type groove, can produce wearing and tearing to the V-type groove, be easy to generate and measure unstable, poor repeatability, the inventor has done improvement to it for this reason, the diamond chip of pasting on the V-type groove is changed into make a call to four apertures on the V-type groove, the jewel ball is embedded on the aperture, the jewel bulb diameter is greater than hole diameter, and applied for patent, the patent No.: 03231510.4.Because, therefore being difficult to degree of precision greater than the diameter of aperture, the diameter of jewel ball guarantees four jewel balls on sustained height, also just to the measuring accuracy generation certain influence of ceramic insertion core.And in the past the external diameter of jewel ball and the relation of tested ceramic insertion core external diameter were not required, when measuring little outside dimension ceramic insertion core, measuring accuracy does not reach requirement.

Summary of the invention

Based on the problem that prior art exists, the purpose of this utility model is to propose a kind of ceramic contact pin that adapts to various external diameters can both carry out the measurement of internal diameter and concentricity well, and measurement data accuracy and the repeated V-type groove that obviously increases.

V-type groove in ceramic insertion core internal diameter of the present utility model/concentricity measurement mechanism, this V-type groove is made of two little V-type grooves 1 on same axis, on 4 groove faces 2 of two little V-type grooves, respectively be equipped with an aperture 3, aperture is embedded with the jewel ball 4 identical with hole diameter, wringing fit between aperture and the jewel ball, and fix by epoxy glue.The peak of 4 jewel balls should remain on same surface level, and with V-type bottom land plane parallel, tested ceramic insertion core 5 external diameters contact with the external diameter holding point of jewel ball, and the spacing of two or two beads will guarantee that tested ceramic insertion core can steadily be shelved on the bead on the groove face.The external diameter of jewel ball is 0.38-1.25 with the ratio of tested ceramic insertion core external diameter.

The great advantage of this structure is: the jewel ball is identical with the diameter of aperture, easier its height of controlling when the jewel ball is glued.The external diameter of jewel ball can not be excessive with respect to tested ceramic insertion core external diameter, the radius-of-curvature of the jewel ball of less external diameter is bigger, the cylindrical of ceramic insertion core is easier like this contacts with jewel ball surface holding point, make the contact pin of various external diameters can both well carry out the measurement of internal diameter and concentricity, the measurement products scope of application increases greatly, and measurement data accuracy repeatability obviously increases.

Description of drawings

The structural representation that Fig. 1 designs for the utility model;

Fig. 2 is the A-A anatomical structure synoptic diagram of Fig. 1.

Specific implementation method

Below in conjunction with drawings and Examples specific implementation method of the present utility model is described in further detail: according to tested ceramic insertion core external diameter φ 1.25mm, length 9mm, the diameter of the jewel ball on then selected two little V-type grooves is φ 1.5mm, the diameter of aperture and jewel ball is identical to be φ 1.5mm also, and the distance on the groove face between two beads is 4mm.Diameter difference between 4 jewel balls should be less than 1 μ m.

According to needing proofread repeatedly after the assembling of above-mentioned structure, up to the internal diameter standard deviation: 3 σ≤0.1 μ m, concentricity standard deviation 3 σ≤0.25 μ m with the standard ceramic lock pin.

The external diameter scope that present embodiment can allow to measure ceramic insertion core is φ 1.2mm～φ 4.0mm, and contact pin length is 4.0mm～17.0mm.

Table 1 is the φ 1.5mm jewel ball and the patent No. of present embodiment: the measuring accuracy correlation data of the 03231510.4 φ 3mm jewel ball that uses: these data are for to measure on same equipment, with standard ceramic contact pin continuous coverage 20 times.

Table 1

	φ 1.5mm V-type groove		φ 3mm V-type groove
					Internal diameter (μ m)	Concentricity (μ m)	Internal diameter (μ m)	Concentricity (μ m)
	Maximal value	125.55	0.68	125.55					0.72
Minimum value					125.46	0.32	125.46	0.35
	Mean value	125.50	0.50	125.50					0.53
Standard deviation					0.02	0.14	0.02	0.18

Table 2 is measuring repeatability verification msg (measures 1000 ceramic insertion cores under normal mode, use standard ceramic lock pin continuous coverage 20 times after finishing).

Table 2

	φ 1.5mm V-type groove		φ 3mm V-type groove
					Internal diameter (μ m)	Concentricity (μ m)	Internal diameter (μ m)	Concentricity (μ m)
	Maximal value	125.59	0.62	125.56					0.66
Minimum value					125.51	0.49	125.48	0.52
	Mean value	125.55	0.52	125.52					0.55
Standard deviation					0.02	0.13	0.03	0.20

The concentricity data (every measurement 10000 ceramic insertion cores with standard lock pin measure 30 time) of table 3 for judging serviceable life.

Table 3

Number of times	Standard ceramic lock pin (measuring 30 times)
			Mean value (μ m)	Standard deviation (μ m)
	0 time	0.55			0.10
10,000 times			0.53	0.11
	20,000 times	0.50			0.13
30,000 times			0.51	0.13
	40,000 times	0.49			0.15

To sum up data reflection, the utility model φ 1.5mm jewel ball V-type groove is the patent No. relatively: 03231510.4 design V-type groove advantages characteristic is had outstanding performance.

(1) the utility model V-type groove is for obviously being better than the patent No. on the fitness of different overall dimensions products: the V-type groove of 03231510.4 design.

(2) improving before relatively aspect the measuring accuracy.

(3) after 40,000 measurements finish, its mean value and standard deviation performance are still very stable, prove that can be guaranteed 40,000 times serviceable life.

Claims (1)

1. the V-type groove in ceramic insertion core internal diameter/concentricity measurement mechanism, this V-type groove is made of two little V-type grooves (1) on same axis, respectively be equipped with an aperture (3) on 4 groove faces (2) of two little V-type grooves, aperture is embedded with jewel ball (4), and fixes by epoxy glue; The peak of 4 jewel balls (4) should remain on same surface level, and with V-type bottom land plane parallel; Tested ceramic insertion core (5) external diameter contacts with the external diameter holding point of jewel ball, and the spacing of two or two beads will guarantee that tested ceramic insertion core can steadily be shelved on the bead on the groove face; It is characterized in that:

The diameter of the jewel ball (4) that said aperture is embedded with is identical with hole diameter, wringing fit between aperture and the jewel ball;

The external diameter of said jewel ball is 0.38-1.25 with the ratio of tested ceramic insertion core external diameter.