SU1352304A1 - Machine for mechanical tests of materials - Google Patents

Abstract

This invention relates to a test technique, in particular to a fatigue test. The purpose of the invention is to increase accuracy by reducing the time of change of the strain rate. The screw loading mechanism 3 of the machine is connected to the drive 9 through the transfer box 4 with one input shaft, 5 and output shafts 6, 7, 7 and 8. In the box 4, additional shafts 10, Pi 12 are installed. All shafts are kinematically connected to the loading mechanism 3 through controlled clutches 13, 14, 16, 20, 21, 22, 23, 24, 25 clutches. Clutches 20, 21 and 22 are mounted on cylindrical gears with a single gear ratio. Clutches 23, 24 and 25 are connected to worm gears with a gear ratio other than one. The clutch 13 is connected to the shaft 6 via a cylindrical gear transmission with a single gear ratio. The couplings are controlled by software block 37. The rotation of shafts 6, 7, 7 and 8 is carried out from the drive 9. The test program is implemented by connecting the couplings to the output shaft. 6, 7 and 8. The program includes the coupling sequence get the loading rate of the sample within the specified limits. 1 il. JV JU SO

Description

The invention relates to a testing technique, in particular to fatigue tests under mechanical loading.

The purpose of the invention is to improve accuracy by reducing the time of change of the strain rate.

The drawing shows the scheme MaiHHHbi.

The machine contains grippers 1 and 2 for material samples, screw loading mechanism 3, transfer case 4 with one input shaft 5 and output 6, 7, 7 8 shafts, drive 9. Additional transfer box 4; 1Ы К), 11 and 12, which are parallel to the other and intersect with the output shafts 6, 6, 7,, 8 at a right angle. On the screw loading mechanism 3, controlled clutches 13, 14 and 15 of the clutch are mounted, which carry out the kinematic connection of the loading mechanism with the donor h.mp shafts. The clutch 13 is equipped with a flywheel 16 to create a dynamic load mode. The clutch 13 is connected to the output shaft 6 by means of a cylindrical gear pair 17 with a transmission oTHonie equal to one. Coupling housings 14 and 15 are fixed on the wheels of worm gears 18 and 19 with gear ratios differing from one (for example, tenfold). The axles of the worm shafts coincide with the axes of the additional shafts 10 and 11. On the additional shafts 10, 11 and 12, the controlled clutches 20-25 of the clutches are installed. Coupling housings 20, 21 and 22 are connected to cylindrical helical gears 26, 27 and 28 with an oTHOHje transmission equal to one, and coupling housings 23. 24 and 25 are fixed on the wheels of worm gears 29, 30 and 31 with a gear ratio excellent from one (for example, tenfold). To obtain the specified rotational speeds of the output shafts 6, 7, 7f 8, worm gears 32 to 35 with a given gear ratio and a cylindrical gear 36 with a single gear ratio are installed on them. Controllable couplings 13, 14, 15, 20, 21, 22, 23 ,. 24, 25 have loading software block 37.

The machine works as follows.

The sample is anchored in grips 1 and 2.

In block 37, the required program is dialed.

0

five

0

five

0

five

This test is carried out by connecting in a predetermined time sequence the couplings 13, 14 and 15, rotating at predetermined speeds to the output shafts 6, 7, 7, 8. To provide a dynamic loading mode, the housing 13 is equipped with a flywheel 16. The output shafts 6, 7, 7, 8 rotate at different speeds by the gear ratio of the gearboxes. The clutch 13 rotates at a constant constant speed equal to the speed of the output shaft 6. The speed of the shaft 10 is determined by the speeds of rotation of the sleeves 20, 21 and 22 and is equal to the speeds of rotation of the shafts 6, 7, 8. Addition; 1no it decreases. worm gear 18. The speed of the clutch 14 is varied by the clutches 20, 21 and 22. Similarly, the speed of the clutch 15 is reduced.

Programming the sequence of coupling engagement we obtain the rate of loading of the sample within the specified limits.

Claims (1)

Invention Formula A machine for mechanical testing of materials, containing grips for a sample of a material, connected to one of the grippers by a screw loading mechanism, a transfer case with parallel inputs and output shafts located in one plane, and connected to the input shaft The drive, characterized in that, in order to achieve accuracy, by reducing the time of change of the speed of the deforming machine, it is equipped with additional shaft, g, 1. The axes of which are located in the plane of the axes of the box and intersect with them under a straight yr; ioM, screw loading mechanism, 1 are kinematically connected with additional shafts and with the output shaft, and the additional shafts are kinematically connected with output shafts by means of. m controlled clutches, the kinematic connections of the screw loading mechanism and one of the additional shafts with the corresponding output shafts. they have a gear ratio equal to one, and the kinematic connections of the screw loading mechanism and the output shafts The appropriate additional shafts - gear ratio other than unity.