SU146577A1 - Machine for determining the mechanical properties of tensile and high-speed heating of flat samples - Google Patents

Description

Machines for determining the mechanical properties of tensile and high-speed heating of flat samples are known, consisting of a loading mechanism in the form of a worm gearbox and screw jack, devices for changing deformations in the form of prismatic heads with quartz rollers fixed at the ends of the sample part of the sample and connected by means of rods with an electric displacement transducer. However, the known machines do not provide high-speed heating of flat samples.

The proposed machine does not have this drawback. This is achieved by the fact that the furnace in the machine is made in the form of two split halves with heating tires pressed against the sample in the preheated state with springs.

The drawing shows schematically the proposed machine.

The machine consists of a heating device, a strain gauge, and a loading mechanism.

The heating device is made in the form of a detachable furnace consisting of two heaters sliding in a horizontal direction, mounted on rollers. Moving the halves of the furnace to the contact of the heated women with the surface of the sample 2 is carried out using the lead screw 3. The force from the lead screw to the heaters is transmitted through the springs 4, which provide the necessary pressure of the heating bar to the sample. To ensure uniform heating along the length of the working part of the sample, the furnace heaters are 100 mm longer than the estimated sample length of 50 mm. The highest rate of heating the sample with a cross section of 2.5 x 10 mm is 70 degrees / second, the temperature unevenness along the length of the working part is 1.5% of the set temperature. Pre-divorced metal plates are heated

No. 146577-2 and brought into contact with the sample surface. To accommodate the strain gauge, the furnace was spun with appropriate cuts. The device for measuring deformations consists of prismatic heads 5, fixed at the ends of the calculated part of the sample and connected by means of rods to an electric displacement sensor (resistance or induction type). To reduce heat removal from the sample to prismatic heads, quartz rollers are placed between them.

To protect the measuring device when the specimen is destroyed, the LOWER gripper is connected by a ball lock 6. The tensile force is measured by a strain gauge 7. The loading and deforming process can be recorded on a loop oscilloscope film. The load is made by a screw jack with a worm gear motor.

The proposed machine allows to vary both the heating modes and the speed of deformation. In addition, the machine according to the invention ensures uniform heating of the working part of the sample and allows one to measure the deformation and force with sufficient accuracy at various loading rates.

The proposed machine is recommended for implementation in laboratories engaged in the study of the mechanical properties of metal.

A machine for determining the mechanical properties of tensile and high-speed heating of flat samples, consisting of a loading mechanism in the form of a worm gear and screw jack, devices for changing deformations in the form of prismatic heads with quartz rollers fixed at the ends of the design part of the sample and connected by rods with an electric displacement transducer, about t and ch and so that, for the purpose of C | K10 of simple heating of flat samples, the furnace is made in the form of two split halves with heating rails pressed against the sample in a preheated state with springs.