SU1301559A1 - Extruder for shakeout machine - Google Patents

Abstract

The invention relates to foundry, in particular, to an extrusion of a coma of knockout plants that are part of the cocTate casting automated lines. The purpose of the invention is to increase the efficiency of the extrusion by the additional impact of the extrusion plate on the molding sand mixture. The goal is achieved by the fact that the pressing plate 6 is connected to the upper plate 3 by shock absorbers 7, and the intermediate plate 4 with the vibration exciter 5 fixed on it is connected to the extrusion plate 6 by means of elastic elements 8 in such a way that the oscillating movements of the intermediate plate are accompanied by blows to the extrusion plate, pressed to the extruded form. In addition, the vibration exciter, made in the form of a single unshaped vibrator mounted on the intermediate plate, is connected to the extrusion plate by means of elastic elements with nonlinear characteristics that have a stiffness in the vertical direction and greater than in the horizontal direction. 1 hp f-ly, 1 ill. i cl oo sd cl with. : ;-- ;;;;.one-. :: .. ::::: .. ..Cv. -.v m y sh (: chy; 5 / / ...

Description

The invention relates to foundry, in particular, to the extrusion of bodies of a coma of knock-out units, the entrance to the casting automated lines.

The purpose of the invention is to increase the efficiency of extrusion by additional impact of the extrusion plate on the molding sand of the cast form.

The drawing shows the scheme of the proposed extruder.

The extruder of a knockout coma consists of a drive 1 with a stem 2, an upper plate 3 attached to the piston actuator stem 1, an intermediate plate 4 with a vibration exciter 5 attached to it, an extrusion plate 6 connected to the upper plate 3 by shock absorbers 7, elastic elements 8, by means of which the intermediate plate 4 is attached to the extrusion plate 6. On the intermediate plate 4 and the plate 6, extrusions are fixed with a gap between them correspondingly

hammer 9 and anvil 10.

Extruder coma knockout installation works as follows.

After installing the cast-in mold 11, the upper plate 3 attached to the rod 2 is lowered by a piston drive 1 and, through shock absorbers 7, presses the extrusion plate 6 to the molding sand. When the pressure in the cylinder of the actuator 1 is reached, providing a force exceeding the disturbing force of the vibration exciter, the vibration exciter 5 is activated, which gives the intermediate plate 4 with the hammer 9 an oscillatory motion in the vertical plane. But the 10, rigidly connected to the extrusion plate 6, is a limitation of the vibrations of the intermediate plate 4, therefore the vibrations are accompanied by strikes of the hammer 9 on the anvil 10. As a result of the impact of the impact load, the mold is destroyed, separated from the flask 12 and falls down onto the embossing grid. The oscillating parts vibrate and, moving down and then up, clean the contour of the mold 12 from the remains of the molding mixture.

Vibrating Hammer is the most effective and economical when extracting molds from

1200 x 1000 mm or more in size, especially if available in forms

E

crosses. Increased efficiency is associated with a change in mode of operation. Unlike vibratory extrusion in a vibro-impact extrusion, the shape is additionally affected by periodic pulsed power loads that occur when the hammer 9 of the intermediate plate 4 strikes the anvil 10 of the extrusion plate 6. At the moment of impact, the resultant force acting on the form is equal to the sum of the forces of the piston drive 1, the disturbing force of the vibration exciter and the force of the impact. High-frequency oscillations occurring in the contact zone of the hammer 9 and the anvil 10 contribute to the formation and development of microcracks in the mold. The choice of the optimal parameters of the vibro-impact extruder coma is made on the condition of ensuring the maximum impact energy equal to the vibro-impactor kinetic energy at the moment of impact, i.e. considering that the extrusion plate is motionless:

m-v2

 max.

(one)

Where

E - impact energy; m is the mass of the shock part; V is the shock mass velocity at the moment of impact.

Condition (1) is fulfilled at the maximum value of the impact rate of the hammer and the anvil, which is determined from the system of equations describing the motion of the impact mass.

 (uuo) + F S in oJ t + N, j

when y 0;

N, r (-C

y-k. y) 0

at 40,

the current coordinate of the vibromass movement (for the origin of the received working surface of the anvil); elastic stiffness; head gap (distance

at the equilibrium position of the vibrating mass to the limiter); periodic disturbing

the power of the vibration exciter; hammer blow force on the anvil;

coefficients of elastic and dissipative components of the impact force.

With a constant mass of the impact part, a constant amplitude of the disturbing force and the frequency of rotation of the exciter eccentrics, the efficiency of the extruder is determined by the stiffness of the elastic elements 8 and the gap between the hammer 9 and the anvil 10. The optimum gap between the hammer and the anvil is in the static equilibrium position at which the blow to the limiter occurs at the maximum value of the vibrating mass velocity.

The application of the proposed extrusion

permits the use of a knockout unit as a single coil of an electrically-electrically controlled electrolyte to increase the efficiency of an extruded circular vibrator. For a vanilla due to a further impact, the fastening of the intermediate plate against the impact of the pressing plate on

to the extrusion plate, a non-molding mixture of the cast mold is produced,

linear elastic elements, hard to reduce the specific energy intensity and

the bone of which in the vertical direction is to reduce the cost of manufacturing for

Leaning is more stiffness in horizontal-account using as vibratory direction. In this case, the condition obtained by the driver of one unbalance vibrator must be met.

numerical analysis of the mathematical model of extrusion

 m 3 QJ,

where c is the stiffness of the bonds in the horizontal direction; Cj is equivalent to linearized stiffness in the vertical direction.

1. An extruder of a knockout coma containing a piston drive, 30 interconnected with shock absorbers between the upper, intermediate plates and extrusion plate, vibration exciter, characterized in that

In order to increase the efficiency of such a ratio of casting by additional impact of the extrusion plate on the casting mold of the cast form, the intermediate plate is installed by means of shock absorbers on the plate and provides for dynamic amplification of vibrations in the vertical direction and vibration isolation in the horizontal direction. Non-linearity of communications ensures the dependence of the vertical 40 with a gap relative to it, the rigidity of the magnitude of the pre-thus the gap is less than the average preload, which allows for the amplitude of vibration of the exciter, the optimal setting of the dynamic 2. The squeezer according to claim 1, o t - mode squeezer If the use is made of the fact that the causative agent is vibrated as elastic elements 45 is made of one rubber washers working in a balanced vibrator, and the shock absorbers of constrained compression with a certain gap between the side surfaces of the washer and the walls of the cage , it is possible to obtain a range of variation of 50 more than in the horizontal.

Compiled by V. Sazonov Editor A. Kozoriz Tehred L. Serdyukova Proofreader I. Muska

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Order 1178/12 Edition 741 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Intermediate-plate ryes have non-linear characteristics, the stiffness of which is pain in the vertical direction. Production and printing company, Uzhgorod, st. Project, 4

stiffness ... 100 s, where c is the initial stiffness of the elastic element prior to contact with the walls of the yoke.

Such a design also allows the ratio between stiffnesses, oscillation frequency and hammer mass to be satisfied.

In addition, the non-linearity of the connections increases the stability of the oscillation mode near the resonance (when) and thus allows an increase in the dynamic gain factor in the vertical direction.

The application of the proposed extrusion use as vibration

the exciter of one unbalanced vibrator.

Claims (2)

1. An extruder of a knockout coma containing a piston drive, interconnected with shock absorbers between the upper, intermediate plates and the extrusion plate, vibration exciter, characterized in that The shock absorbers on the mounting plate with a gap relative to it, while the gap size is less than the amplitude of vibration of the vibration exciter, 2. The extruder according to claim 1, about t - lichayutsi.is with the fact that the vibratory pathogen is made in the form of one unbalance vibrator, and a shock absorber, than in the horizontal one. A gap with a gap relative to it, while the gap size is less than the vibration amplitude of the vibration exciter, 2. The squeezer according to claim 1, about t, is the fact that the vibration exciter is made in the form of one unbalance vibrator, and is more shock-absorbing than in horizontal. Intermediate plate ryes have nonlinear characteristics, the stiffness of which in the vertical direction is pain