SU1398945A1 - Roller die - Google Patents

Abstract

The invention relates to the processing of metals by pressure, can be applied in the production of sheet and bar metal, wire and pipes by drawing. The purpose of the invention is to increase the service life of the die. Roller die contains body 1, work rollers 2, support rollers 3, installed in cages 4 in pairs in one plane, supported on cylindrical surfaces of radius R, adjusting devices: pressure screws or wedges 6, stop — hollow screw 7. 3 ill.

Description

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The invention relates to the processing of metals by pressure, can be applied in the production of sheet and bar, wire and pipe drawing.

The aim of the invention is to increase the durability of the die.

FIG. Figure 1 shows a die with support rollers in swivel collars supported on radially movable pads in fig. 2 is a diagram of the loads on the rollers in FIG. 3 — portage with supporting rollers installed in pivoting cage-levers, pivotally connected to the frame through eccentric axles.

Roller portage contains body 1, working rollers 2, support rollers 3, in pairs in one plane installed jneHHtie in holders 4, supported on cushions 5 along cylindrical surfaces of radius R (Fig. 1), adjusting devices: pressure screws Or wedges 6, the stop is a hollow screw 7.

In the device (FIG. 3), the support rollers 2 are mounted in lever cages 8 supported on eccentric axes 9 along cylindrical surfaces of radius R, eccentric axes located iJ

the wives in the holes of the housing 1. The adjustable stops 10 and 11 are made in the form of a plate 10 with slots for the protruding parts of the rollers, which are worn on the ends of the adjusting screws 11.

The device works as follows.

In the process of drawing on the work roller 2 (FIG. 2), two active forces act: pressure P of the metal and part of the effort of drawing S. These forces are brought to the center of the roll (their moments are not shown) “Equal F forces P and S are deflected from the end plane dies towards the movement of the metal, equidistant from the axis of the dredge X, the support rollers 3 are loaded unequally, the roller on the output side of the dredge - FF is more heavily loaded, the contact stresses increase accordingly

This reduces the durability of the surfaces of the interaction between the working and transferring rollers.

In the proposed device, paired support rollers 3 are installed in a flip cage 4 (Fig. 1) or a cage-lever 8 (Fig. 3): the axis of rotation (4 equidistant from the axes of the support rollers 3 in the direction of the working

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roller 2 and is located outside the triangle of the working center 2 and supporting 3 rollers, while from the resultant FP forces P and S (figure 2) attached to the working roller 2, on the holder 4 (or the holder-arm 8 of the device according to FIG. 3) with the support rollers 3, the time F e goes down as the cage 4 (8) turns to an equilibrium position, at which the force arm Fg e O and the support rollers 3 are loaded equally - by the forces F (figure 1) while F i F The overloading of the support rollers 3 on the output side of the die is eliminated.

In reality, the ratio of the forces P and S (Fig. 2) may vary, for example, due to the instability of the mechanical properties of the material along the length of the workpiece, which leads to oscillations of the angle of rotation of the yoke 4 (8) with the support rollers and, therefore the size of the cross section of the product. This phenomenon is eliminated by limiting the angle of rotation of the sleeves 4 (8) to an adjustable stop, for example, a central hollow screw 7 (Fig. 1) or screws 11 (Fig. 3) through the plate 10 with slots for the product and for the protruding parts of the rollers worn on the ends of the adjustment screws.

The dimensions of the caliber, depending on the interposition of the working rollers 2, are adjusted (Fig. 1) by the pressing devices 6 through the cushions 5 and the clips 4 with the support rollers 3 or (Fig. 3) the eccentric axles of the hinge connections of the clips 8 to the casing 1.

The effect of equalizing the loads on the support rollers and eliminating the overload of the support rollers on the output side of the die is manifested in an increase in the contact durability and service life of the rollers before the onset of fatigue destruction of the interaction surfaces.

The increase in the contact durability of the support rollers on the output side of the die is determined by the dependence

II P1 J

N, / NH (with „/ СН) (F / F)

where G, G, are the contact voltages from the forces F, F (Figures 1 and 2);

c. N is the number of cycles of contact stresses G, GH, you

With S / P

held by parts until the start of fatigue failure of surfaces, the exponent is for steel surfaces m 6. 1 / 3-1 / 8 and DJ / D, 1.02, 5 (Fig. 2) durability of supporting

rollers increased 1.5 times.

c, 3.3 If we take into account that as the diameter of the working rollers decreases, the S / P ratio increases, we should expect -3. ..2 times the long runtime of the support rollers.

By a similar calculation, the contact durability of the working rollers is increased by 1.7 ... 1.1 times.

Ultimately, the consumption of rollers, the number of transshipments and the loss of time for transshipment (especially

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when replacing the support rollers), the productivity of the drawing process is improved.

Claims (1)

Invention Formula Roller portage containing housing, working rollers, pairs of supporting rollers for each worker and pressure mechanisms of the rollers, characterized in that, in order to increase the durability of the die, it is provided with clips for each pair of supporting rollers with a cylindrical contact surface under the support surface, also made cylindrical, the axis of which is equidistant from the axes of the support rollers in the direction of the working and is located outside the triangle of the centers of the rollers, and an adjustable axial stop installed in the housing in conjunction with the edge of the clip. phases. 2 W 9ut.5