SU66765A1 - Instrument for determining the hardness of metals by the indentation method - Google Patents

Description

One of the most common (the most common methods of testing the hardness of metals is that the pressure under pressure is pressed into the surface of the metal under investigation; the tip is made of a material of greater hardness than the test one (usually using a diamond pyramid with a certain trench shape) and then imprint is judged on the hardness of the metal.

For a more accurate study of the imprint, you usually use the mikpocKoinoM. In this case, it is advisable to combine the microscope with a single instrument with a device for pressing, and an ache called an indenter, and a microscope feed mechanism can be used to perform the operation of pressing.

When pressing diamond amide, it is necessary that dav6n: e be constant, regardless of the force of non-pressing. To fulfill this condition, the load is mounted on a table, reinforced at the top end

stock.

For lowering the tip on the surface of the product is used

A locking device in the form of a PO-rotary handle, which lifts the tip and relieves the surface of the product from pressure. .

The peculiarity of the proposed device is that an intermediate washer is mounted between the flange of the rod and the arresting body to prevent the arresting device from transmitting torque.

The drawing shows (in section) the proposed device. It consists of an indenter head (shown on the left), which serves to produce prints and is fastened using a common holder with a microscope lens (shown).

The indenter consists of a main shaft 2, on the lower end of which a diamond tip 14 is fixed, and on the top there is a table / for tetanovki cargo. The rod 2 can be moved in the axial direction to the left in two guide washers

12 and 15. To return the rod to its original position, a spring 10 is used. All parts, the identifier are enclosed in a common body 3. In the lower part of the indenter, there is a locking device, which is suitable for bringing the diamond tip to the surface of the tested product or away from it and consisting of a cylindrical cover 4 of the housing with a handle 8. When. The handles of the flap 4 are raised upwards due to the presence of the helical guides 16 in the fixed case of the idtor, which includes cutouts of the cover of a pipe. In this case, the lower bottom of the cap abuts against the collar lug on the lower part of the stem, lifting the latter. To prevent the rod itself from turning and to prevent the transfer of torque to the rod, which can lead to damage. Imprint, if the diamond tip has not yet moved away from the surface of the product, a tool is used, consisting of studs 5 installed in the intermediate washer 7 and passed through the hole of the lower fixed direction of the rod. They serve to support the support washer 6, against which the spring 10 of the arrester rests.

Subject invention

A device for determining the hardness of metals by the indentation method, made in the form of a microscope indenter mounted on the objective end of a tube with a loaded rod, equipped with pivot points in the armature, characterized in that, in order to eliminate transfer of arresting force An intermediate washer 7 is mounted on the rod 2, between the flange of the latter and the body 13 of the retractor. The carrier studs 5 are passed through the holes of the lower stem guide and serve to support the washer 6 of the arresting spring 10.