SU1593764A1 - Method of cross-taper rolling of stepped articles - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the production of stepped articles. The purpose of the invention is the expansion of technological capabilities by rolling stepped products with eccentric sections. The heated billet is fed into the space between the rollers (B) 1 and 2. In 1 and 2, their deforming sections and calibrating surfaces (KP) with a constant radius and KP 7 with a variable radius simultaneously form axially symmetric and eccentric sections. In this case, the variable radius forming the CP 7 is made periodically varying in dependence: RB = √R 2 + A 2 + A 2 + B 2-2R K .COS (T-ϕ .I) + 2R KB .SINT-2AACOSϕ. T-2ABSIN (ϕ .I) ϕ = 1 / IARCSIN [(I + 1) / A (B .COST-A .SINT) + T / I], where RK is the radius of the eccentric part of the workpiece

A is the distance between the shaft and the workpiece

A and B - coordinates of the center of the eccentric relative to the axis of the workpiece

T - the angular current parameter on the workpiece

R B - current roll radius

ϕ - the current value of the angle ϕ

I - gear ratio from the shaft to the workpiece. In this case, the period of change of the radius is equal to the angle ψ = 2ϕ / I, and the deforming sections on both rolls are shifted relative to each other by half a period ψ / 2. By rolling the billet in rolls made according to the indicated relation, it is possible to obtain simultaneously eccentric and axisymmetric sections on the product. 7 il.

Description

where R is the radius of the eccentric part of the workpiece; A is the distance between the axis of the roll and the workpiece; a and b - coordinates of the center of the eccentric relative to the axis of the workpiece; t is the angular current parameter on the workpiece; Rg - the current radius of the roll; Cjp - the current value of the angle cf; i - the gear ratio from the shaft to the workpiece. Wherein

the period of change of the radius is equal to the angle t | / 2 u / i, and the deforming sections on both rolls are offset from one another by half the period W / 2. By rolling the workpiece in rolls, made according to the indicated relation, it is possible to obtain simultaneously eccentric and axisymmetric sections on the product, 6 sludge.

: l

: o: o

The invention relates to the processing of metals by pressure and can be used in the production of stepped articles.

The purpose of the invention is the expansion of technological capabilities by rolling stepped products with eccentric sections.

Figure 1 shows the coordinate systems for defining a roll profile; figure 2 - parameters ekstgltrmka; Fig. 3 shows a tool for carrying out a cross wedge rolling process; Fig. 4 is a scan of the tool for implementing the noneiu-HHo-wedge rolling method; on fig.Z - a.-p of the brake pad axis; in FIG. 6, FIG. 5, FIG.

The method of cross-wedge rolling of stepped products includes the deformation of the workpiece and its calibration in one pass of the tool, made in B1 more than two rolls 1 and 2, on the cylindrical surface 3 of each of which a wedge 4 is installed, having deforming sections from g- - 5L

R (, - IRK + A + a + b (t-tf-i) + 2Rj, co8t + 2R | b .sint-2A-a cos (q) .i) -2A b sin (cp-i);

C | -v- arcsin Ld (b cost - a sirit)

H.

x de Rp, the current radius of the roll;

R is the radius of the eccentric part of the workpiece;

A is the distance between the axis of the roll and the workpiece;

, a and b are the coordinates of the center of the eccentric I - ka with respect to the axis of the workpiece: : t - corner current parameter on

stocking;

C || - the current value of the angle of rotation of the rolls;

i - the gear ratio of the roll to the workpiece.

At the same time, the period of change of the radius is equal to the angle

: surfaces 6 of variable radius on: both rolls 1 and 2 are shifted one relative to the other by half a period (j7 / 2;: The part of the workpiece under the eccentric portion is formed by a calibrating surface 7 with a variable radius, and the remaining parts of the workpiece with axisymmetric plots are formed by calibrating surfaces 7 with a constant radius

Conclusion based on which the radius of the rolled rolls varies. The part of the cylindrical surface of the rolls with a variable radius, deforming the eccentric part of the workpiece, is a cylindrical surface that rolls around the eccentric. The task is to find the envelope surface if the relative motion of the two surfaces of the product and the roll and one of the surfaces, namely the product,

The following coordinate systems are specified:

Figs, 1 - xjOyi and XgOiy - fixed coordinates in space;

clone deforming surfaces 5 and calibrating surfaces 6

and 7.

I

The calibrating surfaces 6 are cylindrical with a constant radius, and the calibrating surface 7 with a variable radius, which varies from time to time.

H.

0

five

and, y, are the coordinates rigidly associated with the roll and the workpiece, respectively;

A — center distance; CP - the current angle of rotation of the roll; i - gear ratio.

Then the envelope profile of the roll gauge is found from the system of equations

(N

J

M

Vg) About

-

where NJ is the normal to the cam; Vj are the relative velocities in the coordinate system, y, Gd are the radius vector in the coordinate system, ordinates XjjOy; The MoE matrix of the transition of the sys-e coordinates to the system Gd is the radius vector in the x, 0, y coordinate system.

The first equation characterizes the link, that is, the scalar product of the normal to the eccentric and the relative velocity in the coordinate system is zero. The second equation is the formula for the transition from the coordinate system, the ultrasound to the xo system.

Matrices of transition from system to system MDZ and reverse N30

0

M,

thirty

M

03

ccsq Ci + l) -sinq Ci + l) Acos iq)

sinqp (i +) cosq (i + l) AsiniiU)

00 1

cos (p (i + l) sintpd + l) -AcosC / J

-sincf (i + l) cosq (i +) Asin {f

00 1

The relative speeds of movement of the tool and the workpiece in the x coordinate system are determined by the formula

  dM, o .. -

V - --- ,,. “,. ,, yes V.

 dtp 03 -3

After substituting the values of the transition matrices receive

O- (1 + 1)

(i + i) o o o o

BUT

-A cos cf; ABOUT

xr,

Let the eccentric surface is given in the coordinate system (FIG. 2) by the equation

 t

R..sin t I)

where 0 is the axis of the rolled part;

O 2. - eccentric axis; Ri is the eccentric radius. Then in the coordinate system the eccentric equation has the form.

g M „

05

(R cost + a) cosq (i + l) + (RnSint + b) sinCp (i + l) -A cosC / - - (RnCost + a) sLnq (i + l) + (R ,, sint + b) coscp (i + O + A sintp ||

:. I

Solving the resulting equations together, get the envelope.

25 - felling

one

J -r-arcsin

n 1

in --- (b cost - a.cint) + -I-. cos (t- (f.l) + 2RnCost + 2Rj, b-sint-2A-a co8 (q. i) -2A b stn ((f.i)

The dimensions of the rolled product are shown in FIG. 5, the eccentricity of the surfaces with a diameter of 36 and 30 is 2.5 mm. According to (1), the dimensions of the current roll radius R are found in accordance with the angle (About the calibrating surface 7. The dimensions of the roll calibrating surfaces 6, forming axisymmetric sections 8 on the workpiece, are determined based on the dimensions of the finished product and known methods

The period of change of the radius of the rolls on the calibrating surfaces is

d 2t

- - T-i

H-21

dk

where 1 - - 13.8;

 workpiece rolling diameter at

rolling.

The calibration surfaces 7 are offset one relative to another by the amount

1 2t 2

13 ° W

 Gg

1 UG

cos t + a

3 1 t + b

Normal to this surface in the system. - t,

(N ,, v,) (i + l) (t + b) + A t (i + l) (t-a) -A with a

-Ch;

in the system of g "the coordinates of the cam

; (one)

Rolling is carried out as follows.

Heated to POO, the blank is introduced into the space between the rolls. The roll drive is engaged. Rolls 1 and 2 with their deforming sections 5 and calibrating surfaces 7 with variable

The radius and gage surfaces 6 simultaneously form eccentric and axisymmetric areas on the workpiece. At the same time, the calibrating surfaces 7; with a variable radius

form eccentric sections 9. 1 The workpiece during the rolling process is pressed on the rolling axis with interwaxing wires 10,

 The rolling of the product takes place in one revolution of the rolls.

The method allows to expand the technological capabilities by rolling the product with eccentric sections.

55

Formula 3 o b riet

e ni

The method of cross-wedge prokAtki step products, in which

the cooking is deformed and calibrated in one pass in rolls with wedges having gauge surfaces of the radius of the radius in the deforming section, characterized by

R cos (t-q i) - -2R | coet + 2R | b 8int-2A-acosCCf i) -2A-bstnCCf-i))

JV "lh

arc8in

riii (b-cost - a-sint) + | L

de Ri is the current radius of the roll} R., is the radius of the eccentric part of the workpiece} tS A is the distance between the axes of the roll

and workpieces, and and b - center coordinates xxcent

rika relative to the axis; cooking; 20

t is the angular current parameter on the workpiece;

die

Wow

that, in order to expand technological capabilities, calibration in valkak is carried out with a periodic change in the radius of the calibration surfaces according to

(O is the current value of the angle of rotation of the rolls; i is the gear ratio between the shaft 1 and the workpiece, while the period of change of the radius is equal to the angle (| -.-, and deforming

plots on both rolls are offset from one another by half the period.

66 6

teJ

FIG.

Phage.5

Phage

Claims (1)

Claim At the same time, eccentric sections 9 calibrating along a radius of 7 with variable radius 9. 1 during the rolling process, hold the rolling axis The method of cross-wedge rolling 'step products, in which 7 1593764 the preparation is deformed and calibrated in a single pass in rolls with wedges having calibrating surfaces of variable radius in the deforming section, characterized in that, in order to expand technological capabilities, calibration in the rolls is carried out by periodically changing the radius of the calibrating surfaces according to addictions R _ft “•> | R ^ + A ² '+ a ² ' + b ^Z -2R c cos (ty><i) + 2R _{) i} Coet + 2R ^ b (jf = 4-arcein ^ -ii (b < co8t - a sint) j + ................ ¹ sint-2A · acos (lf · ί) -2Α where ra - current roll radius; - the current value of the angle of rotation ^R k - radius of eccentric participation that rolls; ka blanks; fifteen i - gear ratio A - the distance between the axes of the roll · do roll ιΗ blank, and blanks at this period of change of radius a and b - coordinates of the center of the eccentric veins a corner ψ = —ϊ—, and deforming axis relative behind- Cooking 20 sections on both rolls are offset one t is the angular current parameter on relative to another half the workpiece; period G ' Figure 2 Type A Figb