Device to detect profile of materials in deformed condition

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment, in particular, to devices for measurement of profile of surfaces of low-modular viscoelastic sheet materials of light industry, namely, man-made and natural leathers, etc. A device to detect profile of materials in deformed condition, comprising a base, a counting unit, a locating element, installed as capable of rotation around its axis, differing by the fact that the locating element is made in the form of a semi-cylinder with a hollow semi-cone and two limiting plates to fix a sample; the device comprises an additional counting unit fixed on the semi-cylinder, to detect bending radius of the investigated sample, arranged in parallel to the semi-cone guide, at the same time the main counting unit is made as combined, capable of displacement along the axis of rotation of the locating element and comprises a strain gauge motion sensor and a digital optical microscope.

EFFECT: device makes it possible to study hidden defects of natural leather and man-made materials, to determine variation of material relief under bending deformation.

2 cl, 1 dwg

 

The invention relates to measurement devices, in particular to devices for the measurement of the surface a flowable viscoelastic sheet materials light industry, namely synthetic and natural leathers, etc.

A device is known (patent 2464527) to measure the roughness of a sheet of viscoelastic materials containing base, a clamping member mounted rotatably about its axis, a node of a clip of a controlled material to the clamping element and the reference node.

The disadvantages of the known devices is the inability to investigate the change in surface roughness and land elevations under bending deformation.

An object of the invention is to expand the functional capabilities of the device to measure profiles of anisotropic surfaces of sheet materials under bending deformation, including skladkoobrazovaniem and break the leather.

The technical result is achieved in that the device for determining the profile of the material in the deformed state, containing a base, a readout node, the clamping member mounted rotatably around its axis, characterized in that the clamping element is in the form of a half cylinder with a hollow-cone and the two bounding plates for cu�came of the sample; the device comprises an additional readout node attached to the cylinder, to determine the radius of curvature of the test sample, which is parallel to the guide half cone, in addition, the main reading unit is designed combined with the possibility of moving along the axis of rotation of the clamping element, parallel to the guide of the hollow half cone, and contains a strain gauge displacement sensor and a digital optical microscope.

The device (Fig.1) consists of the clamping element 1 formed in the shape of a truncated cylinder with a hollow cone mounted on the shaft 2. The shaft 2 is located on supports 3, is connected by a gear 4 with the motor 5. On the basis of the device 6 is attached with 7 movable bracket 8, the displacement sensor 9 and a digital microscope 10 which constitute a readout node, on the semicylinder guided by the half cone fixed limiters 11, 12 for fixing the samples of the investigated materials, one of the limiter 12 is provided with a scale and an additional readout node to determine the radius of curvature of the test sample.

The device operates as follows.

Researched cone-shaped sample of the material 13 is fixed by means of stop plates 11 in hollow cone clamping element 1. Visually and when pomoynitska 12 assess the quality of the sample surface, determine the radius of skladkoobrazovaniem. Then turn the bracket 8 to the contact of the probe sensor 9 with the surface of the sample and include an electric motor 5, is carried out tracing material under the probe stylus, using additional readings the readout node 12, calculate the radius of curvature of the sample material. After finishing the measurement output of the sensor probe from contact with the material, include reverse operation of the motor for moving the clamping element to the initial position. Then make a conclusion about the change in the surface of the material at different degrees of deformation of the bend.

The radius of curvature of the material, at which the formation of folds in the material, determined by the formula:

Rm=RK-2h,

where: Rmis the radius of curvature of the material, causing land elevations;

RKis the radius of the hollow half cone in place of skladkoobrazovaniem;

h is the thickness of the material.

Thus, the device allows to determine the surface roughness flowable synthetic materials in a deformed state, to measure the change of stamping material during bending deformation, to determine the radius of skladkoobrazovaniem sheet materials in bending, including to determine tbsistuste genuine leather.

The device gives the opportunity to explore the hidden defects of genuine leather, arts�nnyh leather and other sheet of artificial materials, to determine the change in elevation of the material during bending deformation.

For example, to determine skladkoobrazovaniem sample of genuine leather with bending deformation measure the thickness of the material, which in this case is 1.4 mm, then cut out a cone-shaped sample of the material, put it in a hollow cone and fixed through clamping plates 11 and 12. Then visually and using a digital microscope assess the condition of the surface of the material by moving the digital microscope along the specimen, fixed in the hollow cone, the additional readout node 12 determines the radius of a hollow cone, in which the surface of the material folds appear. In the example, the folds were formed when the radius of curvature of a hollow cone, is equal to 6 mm. from these data, calculate the radius of skladkoobrazovaniem for the studied material, according to the above formula, Rm=6 mm-2×1.4 mm=3.2 mm. Then lead the probe sensor 9 into contact with the surface of the material 13, includes motor 5, carry out the tracing of the surface and determine the standardized parameters of surface roughness, for example the size of projections and depressions, the pitch of the protrusions and the average deviation from the baseline.

1. A device for determining the profile of the material in the deformed state holding the base, tschetnye, the clamping member mounted rotatably around its axis, characterized in that the clamping element is in the form of a half cylinder with a hollow-cone and the two bounding plates for mounting the sample; the device comprises an additional readout node attached to the cylinder, to determine the radius of curvature of the test sample, which is parallel to the guide half cone.

2. The device according to claim 1, characterized in that the main reading unit is designed combined with the possibility of moving along the axis of rotation of the clamping element and contains a strain gauge displacement sensor and a digital optical microscope.



 

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