SU1256825A1 - Pilger rolling mill - Google Patents

Abstract

The invention relates to pipe production and can be used in rolling tubes of varying transverse and longitudinal sections. The aim of the invention is to expand the technological capabilities of the mill due to the use of an increased working angle and a decrease in moving and flywheel masses, as well as an increase in the reliability of its operation. Pilgrim mill rolling with (L

Description

holds stationary stand 1 with rollers 2, drive 3 of rotation of rollers, carriage 4 of mandrel rod 5, fixed stationary mechanism 6 for its reciprocating movement, cartridge 7 of the workpiece, mechanism 8 for its reciprocating movement with movably mounted gearbox 9, is kinematically connected with the gearbox shaft unevenly rotating intermediate link 10 and the screw feed mechanism with a nut 11 mounted in the movable gearbox housing, and with a fixed screw 12, having a discontinuous turn mechanism ota. The mechanism of intermittent rotation of the screw is made in the form of a rail 13, mounted on the carriage rod, and interacting

I

The invention relates to pipe production and can be used in rolling tubes of variable transverse and longitudinal sections.

The aim of the invention is to expand the technological capabilities of the mill by using an increased working angle of the rolls and reducing the moving and flywheel masses, increasing reliability.

FIG. G shows the scheme of the mill in the plan; in fig. 2 is a diagram of the connection of the nut of the feed pair with the gearbox in the case of a screw located along the rolling axis.

The mill for rolling contains stationary stand 1 with rollers 2, drive 3 rotation of the rolls, carriage 4 mandrel rod 5 and fixed stationary mechanism 6 for its reciprocating movement, cartridge 7 of the workpiece, mechanism 8 for its reciprocating movement with movably mounted gear 9 kinematically connected with the shaft of the gearbox, an unevenly rotating intermediate link IO and a screw feeder with a nut 11 mounted in the movable gearbox housing, and with a stationary set gear ring the rim 14 of the free-wheeling mechanism 15 installed permanently, the variator 16, the clutch clutch 17 and the gears 18, 19 and 20. On the opposite side of the carriage there is a second free-wheeling mechanism 21 21, kinematically connected with a mandrel rod and interacting with a toothed rim 22 with the second rail 23, fixed permanently. To recharge the mill, it is equipped with a drive 24 for speeding up the reduction of the gearbox with the workpiece cartridge and its movement mechanism, a V-belt drive 25 and a friction clutch 26 controlled by a pneumatic cylinder mounted on the shaft of the cam clutch, 1 hp. f-ly, 2 kit.

with a fixed screw 12 having a discontinuous turning mechanism, made in the form of a rail 13, mounted on a rod carriage and interacting

with it, the toothed rim of the rim 14 of the free-wheeling mechanism 15 installed stationary, the variator 16, the clutch clutch 17 and the gears 18, 19 and 20.

On the opposite side of the carriage, a second free-running mechanism 21 is installed, kinematically connected with a mandrel bar and interacting with a gear rim of a rim 22 with a second bar 23 fixedly mounted.

To recharge the mill with a new billet, it is equipped with a drive 24 for rapid withdrawal of the gearbox from a patr

nominal workpieces and the mechanism of its movement, the V-belt transmission 25 and the pneumatic cylinder controlled friction clutch 26 clutch, mount-. on the shaft of the cam clutch.

Each branch of the double mechanism of reciprocating movement of the carriage is performed in the form of a connected two-crank common crank, and slider-crank mechanisms.

The mechanism of the reciprocating movement of the cartridge billet vypolsoyuz SOVIET

SOCIALIST

REPUBLIC

(nineteen)

SU.,., 1256841 Af

(5D4 W 21 J 13/02

USSR GOVERNMENT NOMETETE FOR INVENTIONS AND OPENINGS

DESCRIPTION OF THE INVENTION

TO AETOR CERTIFICATE

(21) 3860737 / 25-27

(22) 03/01/85

(46) 09/15/86. Bul № 34 (72) A.A. Vakalov, A.M. Malakhov, O.K. Nurzhanov and L.N. Murmansk (53) 621.777 (088.8) (56) USSR Copyright Certificate No. 1050799, cl. B 21 J 13/02, 1981. (54) (57) CLAMPED STAMP STAMP, containing a punch with a beveled protrusion shifted relative

but a stamp engraving, and a matrix with a notch under the protrusion of the punch, characterized in that, in order to increase the durability of the stamp and expand its technological capabilities, in the wall of the matrix from the side opposite to the engraving of the stamp,: - the cavity connected with the notch under the protrusion is filled punch, while in this recess is placed fusible material.

(L

to

SP

but

00 4ib

The invention relates to the processing of metals by pressure, in particular to the design of dies for closed die forgings under isometric conditions, for example, compressor scraps.

The aim of the invention is to expand the technological capabilities of the stamp and increase its durability.

The drawing shows a stamp, a general view ..

The stamp for closed isothermal punching consists of a punch 1 with a protrusion 2 offset from the engraving, and a die 3 with a notch 4 of the protrusion 2. The punch and the die form a stream 5. At the protrusion 2, the bevel is made 6 and in the die (its side wall) you - additional groove 7 is connected, connected to the main notch 4 by channels 8. Notch 4 is filled with material, the temperature of which is lower than the heating temperature of the stamp,

The stamp for closed isothermal stamping works as follows.

When lowering the punch 1, the protrusion 2 enters the recess 4, forms a closed cavity and beveling 6 acts on the molten material. As the projection moves, the cavity is completely filled with molten material, and then it is pumped through channels 8 into additional recess 7. The overflow occurs at a certain pressure in the closed cavity of recess 4. Pressure is transferred to bevel 6 of protrusion 2 and presses the punch to the side walls of the matrix.

The clamping force (P must evenly transmit the force (P) of the lateral pressure from the effect of the deformable metal on the side walls of the closed brook 5, i.e.

PS P ApS cosoi,

where ar is the pressure drop of the molten material in the main and additional notches (since the pressure in the additional notch is 1 atm, it is assumed that LR is equal to the pressure of the molten material in the main notch);

VNIIPI Order 4861/7

Random polygons pr-tie, Uzhgorod, st. Project, 4

S is the contact area of the projection bevel with the molten material;

S - the angle of inclination of the bevel to the protrusion of the punch.

The known dependence for a certain speed of movement of the punch is used to find the size of the cross section of the channels that provide the necessary pressure (flp) in the closed cavity of the main recess.

Q f.

2d2

Ml (| I.

where Q v-S | sino - the mass of the flowable material from the main notch to the additional one;

V is the speed of movement of the protrusion of the punch;

f is the cross-sectional area of the channels connecting the recess;

 - coefficient of fluid flow, determined experimentally; dr - pressure in the closed cavity

main excavation;

p is the density of the molten material; W

d j - is the diameter of the channels connecting the outlets;

 I 45k sinol.

D I is the reduced diameter of the end of the stupa.

After creating pressure in the closed cavity of the recess 4, the workpiece is deformed in the stream 5, which is accompanied by the flow of the molten material from the main into an additional recess. This ensures tight clamping of the side walls of the die and the punch over the entire stamping cycle.

After the punching is completed, the movement of the punch stops, the pressure in the closed cavity of the recess decreases, the punch returns to its original upper position, the molten material flows from the additional recess to the main, the deformed workpiece is removed from the die of the punch and the cycle is repeated.

Circulation 655

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Claims (1)

STAMP FOR A CLOSED STAMP, containing a punch with a beveled protrusion offset from the engraving of the stamp and a die with a recess for the protrusion of the punch, characterized in that, in order to increase the durability of the stamp and expand its technological capabilities, in the matrix wall from the side opposite to the engraving stamp, a cavity is made, connected by a canal. scrap with a recess under the protrusion of the punch, while in this recess is placed fusible material. SU,. „125684 1256841