SU1507855A1 - Method of treating articles - Google Patents

Abstract

The invention relates to vibration treatment of parts and can be used in the manufacture of products in mechanical engineering. The purpose of the invention is to increase the durability of products made of fibrous composite materials. The method includes vibrating at the second resonant frequency of the vibrator with a workpiece and an attached mass at voltages equal to 0.1-0.8 of the previously found conditional material endurance limit, the vibratory loading being carried out during the time at which the accumulated damage reaches 1-1 ,eight%. 2 ill., 1 tab.

Description

The invention relates to the vibration treatment of parts and can be used. Used in the manufacture of products in the machine-building and instrument-making industry.

The purpose of the invention is to increase durability.

Figure 1 shows the dependence of accumulated damage on the time of vibration processing, figure 2 shows the dependence of accumulated damage on the number of cycles under soft cyclic loading (1 - without vibration loading; 2nd vibration loading)

Example. Sheet blanks with a size of 17 mm made of a composite material ADZZ-B with a conventional fatigue limit of 6,650 MPa, found in tests of N 8-S cycles, were subjected to vibro-processing on a VEDS-10A vibrating table at the second pf. the vibrator with the workpiece and the attached mass during the time at which the volume of accumulated damage reached a value of p 1.2% (Fig. 0 at voltages 6 38 MPa.

As a result of vibration processing, product samples were obtained, which were tested for cyclic loading with bending at voltages d 640 MPa and frequencies e 0.33 Hz to achieve | U 9%

: in the soft loading mode, show that the specimens after the vibration loading

I according to the proposed method have a durability of 1.5 times greater than the durability of samples without vibration loading (Fig. 2).

The table shows the data on the processing of ADZZ-B and AD1-B alloys under various loading conditions.

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Vibration processing voltage 6 k b, where k is the voltage reduction factor, is selected in the range of 0.1-0.8; 6-1 is the conditional limit of the vyatnosti material.

Vibration processing effect Э 1 --У 100%, where N is the number of cycles N

loading during testing of samples without vibration treatment; the number of loading cycles in sample testing with vibration treatment of blanks.

Damage accumulated

 about

(- 5 100%, where f ° is the frequency of the signals,

free vibrations of the workpiece (sample) without vibration processing; f p - the frequency of free oscillations of the workpiece (sample) with vibration treatment. The value of f jp decreases with increasing number of cycles of vibration loading, which leads to an increase in the amount of accumulated damage. Before vibro-processing on from

individual samples of the workpiece measure the value of f and fDpDO achieve certain

of the value of p. In this case, the dependence of the magnitude of ju on the time of vibration treatment at a given frequency of vibration loading is determined.

As follows from the table, as a result of processing by the proposed method, the durability of products is increased.

Claims (1)

Formula of Invention A method of treating products, mainly of fibrous composite materials, including vibration of products previously loaded with a concentrated mass at a resonant frequency, characterized in that, in order to increase durability, the vibration is carried out at a second resonant frequency at voltages equal to 0.1- 0.8 conditional endurance limit, during the time at which the amount of accumulated damage corresponds to 1-1.8%. m / r / h Phie.g Compiled by E, Nosyrev Editor L. Pcholinska Techred I. Veres Order 5522/32 Circulation 576 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Fig JO12Sh Proofreader V. Girn to Subscription