SU1009728A1 - Method of vibration treating of parts - Google Patents

Description

The invention relates to the vibration treatment of parts with a free abrasive and can be used in the processing of large-sized parts of complex configuration. The known method of vibratory processing of parts with a free abrasive, in which the part is fixed in the process of being arranged, is placed in the volume of the treated medium with the medium and receiving vibrations from vibrating. Yes, the container, while the parts and the container are reported to oscillate tl. A disadvantage of the known method is the considerable consumption of the processing of the medium, since. In order to achieve high-throughput processing, intensive vibrational displacements are reported to the medium. The purpose of the present invention is to reduce the consumption of the processing medium when processing in a container of a resonant two-mass vibratory machine. The goal is achieved by the fact that in the method of vibration processing of parts, in which the part is fixed in the fixture, I place it in the - volume of the completed processing -. With a thick medium and receiving vibrations from the vibro-drive of the container, the device with the workpiece is mounted on a reactive mass, while their sum and the extended mass is selected 3-10 times less than the mass of the container with the working medium, and the container is oscillated with an acceleration of 2-3. The drawing shows schematically a vibratory machine for implementing the described method of vibratory processing. Fig, 1 shows a vibrating machine, section; in fig. 2 the same. side view; Fig. 3 is a circuit for controlling a multi-phase electromagnetic exciter. The vibrating machine consists of a container 1 and an outer frame 2, elastically joined by me by torsions 3. Fixture 4 with a processed distance and coil 5 of electromagnets are fixed to the frame, which is a reactive mass, mass, fixed cor b electromagnets. The total mass of the container, the coils of the electromagnets and the working medium 7 is several times the total mass of the frame, device and the workpiece. The stiffness of the torsions is calculated so that, at a given vibration frequency, the container-frame system oscillates in a mode close to resonance. Torsions are attached to the container and frame by means of split shoes arranged along the bottom and ends of the container in a staggered order, which ensures uniform processing. Flexural rigidity of the elastic system is calculated from the conditions for the realization of antiphase oscillations of the active and reactive masses. Electromagnetic exciters contain six cores, located with an angular step of 60 ° and united by a common magnet duct. On the cores there are windings connected through semiconductor valves or thyristors to a three-phase, AC network in such a way that through a part of the oscillation period. in the network, equal to П / 3, voltage is applied to each of them. Under the action of a current pulse between each core and installed coaxially and with a gap, a common annular cortex alternately generates an electromagnetic interaction force, the vector of which rotates with an alternating current frequency. This force causes antiphase, in general, circular oscillations of the core and of the cores with a magnet duct with the indicated frequency. This eliminates the tracking of the core b with the coil 5. In each of the windings of the vibration exciter, respectively, the V .., - Vg thyristors are included, the opening angles of which are controlled respectively by the phase control devices I-VI. With circular oscillation trajectories to change the disturbing force and, consequently, changes in the amplitude of oscillations of the working element, the opening angles of the thyristors in the circuit of all windings change in phase. In order to realize the oscillation paths of the working element other than the circumference, for example, for linear or elliptical vibrations with any ratio of the ellipse axes, and located at an arbitrary angle of inclination, the opening angles of each thyristor are adjusted separately. Constructively described electromagnetic vibration exciters and measles are made of sets of annular plates of electrical steel. The windings laid in the grooves of the common magnetic core are fixed with epoxy compound, due to which high mechanical strength, operational reliability and durability of vibration exciters are ensured; The method is implemented as follows. When current of a certain frequency is applied to the coils of electromagnets, the system enters resonant oscillations, at which the amplitude of oscillations of the active mass is inversely proportional to the amplitude of oscillations of the reactive mass, and this is ensured by.

wearing n mr

but with the same .Р

same frequency of oscillation - the ratio

  , t. the main WP is executed

the condition of the method, the detail is fixed to the reactive mass and the acceleration is reported to it, which is 3-10 times greater than the acceleration of the container.

Fastening parts on a reactive mass allows the use of the latter for useful work; the acceleration message is 3-10 times exceeding the acceleration of the container, provides high sliding speeds of the particles of the working environment 7 relative to the part, i.e. high performance of vibroabrasive processing and the message of acceleration to the container in 2-3g leads the working environment 7 across the container to a pseudo-liquid state with very low speeds of relative movements, which guarantees insignificant wear (not exceeding 0.2% per hour versus existing wear at 2-3% per hour).

Example. Produced vibration processing of parts weighing

12.5 kg and dimensions 1200x420x70 on a two-mass vibratory machine, including an active (container with a load of 150 kg of working medium) and a reactive (frame, fixture) mass. The workpiece is fixed to the reactive mass.

The oscillation parameters of the reactive mass with the part, at which the acceleration was 9.2a, were as follows: A 4.0 mm, f S 24 Hz, The oscillation parameters of the container at which the acceleration was 2.3a-f were the following A 1 , 0 IsiM, f 24 Hz. At the above accelerations, the flow rate of the processing medium was 0.525 kg per hour (0.35%), the processing time (while reducing the roughness from R, 20 to) was 5 missions,

 . .

The choice of parameters, with KOTOJSJX, the acceleration differed from those chosen above (optimal), also led to a decrease in the flow rate of the working medium and a decrease in processing time in comparison with the known solution, but was

5 is slightly lower than in OPL mode.

Regists are tabulated.

According to the proposed method, the options

Compared with the known solution, the proposed method allows

Reduce the flow rate of the working medium and the processing time 50. 4f (nttM N-1 b1

Claims (1)

METHOD OF VIBRATION PROCESSING- DETAILS OF ITEMS with a free abrasive, in which the part is fixed in the fixture, placed in. the volume of the container filled with the processing medium and receiving vibrations from the container’s vibrodrive, while the parts and the container are informed by vibrations, so that, in order to reduce the flow of the processing medium when processing a resonant two-mass vibration machine in the container, the device they are mounted on the reactive mass with the workpiece, while their total mass is selected 3-10 times less than the mass of the container with the working medium, and vibrations with an acceleration of 2-30 are reported to the container. SU ,, 1009728 FIG. /