SU151085A1 - Tip for measuring hardness - Google Patents

Description

Tips for measuring the hardness of soft conductive materials by the indentation method, having the shape of a pyramid, a cone or a spherical segment, are known.

In hardness testers, in which already known tips are used, the hardness number is measured by measuring the parameters of the indenter prints under a microscope, i.e. outside the hardness tester, using tables.

The described tip differs from the already known ones in that it is made of a composite of alternating current-carrying conductor plates and dielectric layers and has a central rod, which can constitute one electrical circuit with conductive plates when they are inserted into the material under test. As the tip penetration depth increases, the number of connected plates increases, which makes it possible, simultaneously with the deepening of the tip into the object, to note stepwise varying hardness values on the light board and to carry out shop-level hardness testing of materials without directly measuring the size of the print.

The drawing shows a kinematic diagram of a hardness tester using the described tip.

The tip of the hardness tester 1, having the shape of a pyramid, a cone or a spherical segment, is composite and is assembled from separate sections (plates) made of solid metals or alloys. Sections on both sides are covered with a layer of solid electrical insulation 2.

Each section is associated with its own individual illuminator. When measuring the hardness of the electrical circuit sections (from 1 to p) sequence No. 151085-2 -

They are closed due to the contact of the uninsulated ends of the sections with the object being measured. Accordingly, the illuminators (from 1 to p) light up on the light panel 3 of the control panel 4 measurements.

The number of sections that close with the object being measured is, depending on the properties of the object being measured, on the depth of penetration of the tip.

The scale 5 of the light panel is calibrated in units of measurable quantity (kg / mm). Depending on the measurement accuracy requirements, the shape of the indenter is selected (the most accurate is the pyramid) and the thickness of the sections. The central cone 6 must necessarily go deeper into the object being measured. The height h is small and is selected depending on the properties of the measured materials.

When sorting out products, the limit stops 7 of the scoreboard scale are set to the allowable hardness range. Marriage of products that do not fit in the specified interval is fixed by turning on the test bell or light bulb. At the same time, an automatic device that removes a defective product is activated.

The described tip can be used on any hardness tester to control the hardness of soft conductive materials on mass production lines.

Subject invention

A tip for measuring the hardness of soft conductive materials by the indentation method, having the shape of a cone, pyramid or ball segment, characterized in that, in order to eliminate the direct measurement of the imprint size, the tip is made of alternating current-conducting plates and dielectric interlayers and has a central rod which may constitute one electrical circuit with conductive plates when the latter are embedded in the material under test, and with increasing depth This turns the plates increases, which makes it possible to mark on the light board stepwise varying hardness values.