CN106092763A - Detection method based on cable insulating high temperature resistant sheath pressure - Google Patents

Abstract

The present invention relates to detection method based on cable insulating high temperature resistant sheath pressure, it is characterised in that: comprise the following steps: S1, sampling；S2, calculating force value；S3, sample heat；S4, sample are placed；S5, sample cool down；S6, measurement depth of cup: extract the conductor in sample out, along the axis direction of sample, be perpendicular to impression and cut a fillet test piece from sample, lie in fillet test piece reading microscope or measure under measuring projector, reading depth of cup；S7, calculating: calculate the depth of cup percentage ratio to sample mean thickness, obtain sample high temperature resistant pressure assessed value.It is an advantage of the current invention that: by heating cable, cable is made to be in the condition of high temperature, recycling assay device applies precalculated pressure to cable, cooling rapidly, its depth of cup is measured during not redeformation, obtained the assessed value of high temperature resistant pressure by the percentage ratio of depth of cup Yu sample mean thickness, simple to operate, test result precision is high.

Description

Detection method based on cable insulating high temperature resistant sheath pressure

Technical field

The present invention relates to cable performance technical field of measurement and test, be based particularly on the detection of cable insulating high temperature resistant sheath pressure Method.

Background technology

Carry out a kind of method of inspection that Apparatus for Pressure at high-temp is the thermal deformation behavior of examination thermoplastic, be electric wire The insulation of product or sheath at a certain temperature, the mechanical force that is subject to and after deforming, after removing external force, when temperature reduces Can restorable ability.

And cable is likely to occur thermal deformation when running in the environment of higher temperature, it is therefore necessary to its deformability Can detect, to ensure quality when product is properly functioning.

The detection method trivial operations of existing cable insulating high temperature resistant sheath pressure, and accurate testing degree is poor, difficult Using the judging basis as examination cable thermal deformation performance.

Summary of the invention

It is an object of the invention to overcome the shortcoming of prior art, it is provided that a kind of base high with test accuracy simple to operate Detection method in cable insulating high temperature resistant sheath pressure.

The purpose of the present invention is achieved through the following technical solutions: detection side based on cable insulating high temperature resistant sheath pressure Method, comprises the following steps:

S1, sampling: from the tested insulated wire cores sample section of many a length of 250～500mm, intercept 3 adjacent samples, examination Sample a length of 50～100mm；

S2, calculating force value: calculating cutter pressure F on sample according to external diameter, the thickness gauge of sample, formula is:

$F=K\sqrt{2D\mathrm{\δ}-{\mathrm{\δ}}^2}$

In formula: K is the coefficient of regulation in the cable product standard that tested insulated wire cores sample section is corresponding；

D is sample external diameter average diameter；

δ is the meansigma methods of sample thickness；

S3, sample heat: sample is heated to 80～150 DEG C, are heated to when 80 DEG C starting timing, heat 4～6h；

S4, sample are placed: be placed on by sample on Apparatus for Pressure at high-temp device, by the cutter on assay device along being perpendicular to The direction of sample axis applies the pressure calculated in step S2；

S5, sample cool down: inject directly on cold water on the sample under the edge of a knife of cutter, cool down rapidly, are cooled to room temperature And after not continuing to deformation, take out from assay device, be immersed in the water, take out after cooling further；

S6, measurement depth of cup: extract the conductor in sample out, along the axis direction of sample, be perpendicular to impression from sample On cut a fillet test piece, fillet test piece lain in reading microscope or measure under measuring projector, reading depth of cup；

S7, calculating: calculate the depth of cup percentage ratio to sample mean thickness, obtain sample high temperature resistant pressure assessed value.

In step S2, when sample is the insulated wire cores of flexible cord or flexible cable, K=0.6；Sample is that the fixing of D≤15mm applies If during by cable insulated wire cores, K=0.6；Sample be D >=fixing lay with cable insulated wire cores time, K=0.7.

The invention have the advantages that

1, the present invention is by heating cable, makes cable be in the condition of high temperature, and cable is applied in advance by recycling assay device The pressure calculated, cools down rapidly, measures its depth of cup during not redeformation, by depth of cup and the hundred of sample mean thickness Proportion by subtraction obtains the assessed value of high temperature resistant pressure, simple to operate, and test result precision is high.

Detailed description of the invention

Below in conjunction with embodiment, the present invention will be further described, but protection scope of the present invention is not limited to following institute State.

[embodiment 1]:

Detection method based on cable insulating high temperature resistant sheath pressure, comprises the following steps:

S1, sampling: from the tested insulated wire cores sample section of many a length of 250mm, intercept 3 adjacent samples, specimen length For 50mm；

S2, calculating force value: calculating cutter pressure F on sample according to external diameter, the thickness gauge of sample, formula is:

$F=K\sqrt{2D\mathrm{\δ}-{\mathrm{\δ}}^2}$

In formula: K is the coefficient of regulation in the cable product standard that tested insulated wire cores sample section is corresponding；

D is sample external diameter average diameter；

δ is the meansigma methods of sample thickness；

S3, sample heat: sample is heated to 80 DEG C, are heated to when 80 DEG C starting timing, heat 6h；

S4, sample are placed: be placed on by sample on Apparatus for Pressure at high-temp device, by the cutter on assay device along being perpendicular to The direction of sample axis applies the pressure calculated in step S2；

S5, sample cool down: inject directly on cold water on the sample under the edge of a knife of cutter, cool down rapidly, are cooled to room temperature And after not continuing to deformation, take out from assay device, be immersed in the water, take out after cooling further；

S6, measurement depth of cup: extract the conductor in sample out, along the axis direction of sample, be perpendicular to impression from sample On cut a fillet test piece, fillet test piece lain in reading microscope or measure under measuring projector, reading depth of cup；

S7, calculating: calculate the depth of cup percentage ratio to sample mean thickness, obtain sample high temperature resistant pressure assessed value.

In step S2, when sample is the insulated wire cores of flexible cord or flexible cable, K=0.6；Sample is that the fixing of D≤15mm applies If during by cable insulated wire cores, K=0.6；Sample be D >=fixing lay with cable insulated wire cores time, K=0.7.

[embodiment 2]:

Detection method based on cable insulating high temperature resistant sheath pressure, comprises the following steps:

S1, sampling: from the tested insulated wire cores sample section of many a length of 400mm, intercept 3 adjacent samples, specimen length For 80mm；

S2, calculating force value: calculating cutter pressure F on sample according to external diameter, the thickness gauge of sample, formula is:

$F=K\sqrt{2D\mathrm{\δ}-{\mathrm{\δ}}^2}$

In formula: K is the coefficient of regulation in the cable product standard that tested insulated wire cores sample section is corresponding；

D is sample external diameter average diameter；

δ is the meansigma methods of sample thickness；

S3, sample heat: sample is heated to 120 DEG C, are heated to when 80 DEG C starting timing, heat 5h；

S4, sample are placed: be placed on by sample on Apparatus for Pressure at high-temp device, by the cutter on assay device along being perpendicular to The direction of sample axis applies the pressure calculated in step S2；

S5, sample cool down: inject directly on cold water on the sample under the edge of a knife of cutter, cool down rapidly, are cooled to room temperature And after not continuing to deformation, take out from assay device, be immersed in the water, take out after cooling further；

S6, measurement depth of cup: extract the conductor in sample out, along the axis direction of sample, be perpendicular to impression from sample On cut a fillet test piece, fillet test piece lain in reading microscope or measure under measuring projector, reading depth of cup；

S7, calculating: calculate the depth of cup percentage ratio to sample mean thickness, obtain sample high temperature resistant pressure assessed value.

In step S2, when sample is the insulated wire cores of flexible cord or flexible cable, K=0.6；Sample is that the fixing of D≤15mm applies If during by cable insulated wire cores, K=0.6；Sample be D >=fixing lay with cable insulated wire cores time, K=0.7.

[embodiment 3]:

Detection method based on cable insulating high temperature resistant sheath pressure, comprises the following steps:

S1, sampling: from the tested insulated wire cores sample section of many a length of 500mm, intercept 3 adjacent samples, specimen length For 100mm；

S2, calculating force value: calculating cutter pressure F on sample according to external diameter, the thickness gauge of sample, formula is:

$F=K\sqrt{2D\mathrm{\δ}-{\mathrm{\δ}}^2}$

In formula: K is the coefficient of regulation in the cable product standard that tested insulated wire cores sample section is corresponding；

D is sample external diameter average diameter；

δ is the meansigma methods of sample thickness；

S3, sample heat: sample is heated to 150 DEG C, are heated to when 80 DEG C starting timing, heat 4h；

S4, sample are placed: be placed on by sample on Apparatus for Pressure at high-temp device, by the cutter on assay device along being perpendicular to The direction of sample axis applies the pressure calculated in step S2；

S5, sample cool down: inject directly on cold water on the sample under the edge of a knife of cutter, cool down rapidly, are cooled to room temperature And after not continuing to deformation, take out from assay device, be immersed in the water, take out after cooling further；

S6, measurement depth of cup: extract the conductor in sample out, along the axis direction of sample, be perpendicular to impression from sample On cut a fillet test piece, fillet test piece lain in reading microscope or measure under measuring projector, reading depth of cup；

S7, calculating: calculate the depth of cup percentage ratio to sample mean thickness, obtain sample high temperature resistant pressure assessed value.

In step S2, when sample is the insulated wire cores of flexible cord or flexible cable, K=0.6；Sample is that the fixing of D≤15mm applies If during by cable insulated wire cores, K=0.6；Sample be D >=fixing lay with cable insulated wire cores time, K=0.7.

Claims (2)

1. detection method based on cable insulating high temperature resistant sheath pressure, it is characterised in that: comprise the following steps:

S1, sampling: intercepting 3 adjacent samples from the tested insulated wire cores sample section of many a length of 250～500mm, sample is long Degree is 50～100mm；

S2, calculating force value: calculating cutter pressure F on sample according to external diameter, the thickness gauge of sample, formula is:

$F=K\sqrt{2\mathrm{D\δ}-{\mathrm{\δ}}^2}$

In formula: K is the coefficient of regulation in the cable product standard that tested insulated wire cores sample section is corresponding；

D is sample external diameter average diameter；

δ is the meansigma methods of sample thickness；

S3, sample heat: sample is heated to 80～150 DEG C, are heated to when 80 DEG C starting timing, heat 4～6h；

S4, sample are placed: be placed on by sample on Apparatus for Pressure at high-temp device, by the cutter on assay device along being perpendicular to sample The direction of axis applies the pressure calculated in step S2；

S5, sample cool down: inject directly on cold water on the sample under the edge of a knife of cutter, cool down rapidly, are cooled to room temperature not After being further continued for deformation, take out from assay device, be immersed in the water, take out after cooling further；

S6, measurement depth of cup: extract the conductor in sample out, along the axis direction of sample, be perpendicular to impression and cut from sample Take a fillet test piece, fillet test piece lain in reading microscope or measures under measuring projector, reading depth of cup；

S7, calculating: calculate the depth of cup percentage ratio to sample mean thickness, obtain sample high temperature resistant pressure assessed value.

Detection method based on cable insulating high temperature resistant sheath pressure the most according to claim 1, it is characterised in that: step In S2, when sample is the insulated wire cores of flexible cord or flexible cable, K=0.6；Sample is that fixing the laying of D≤15mm uses cable insulation During core, K=0.6；Sample be D >=fixing lay with cable insulated wire cores time, K=0.7.