SU992164A1 - Method of machining variable cross section annular groove of articles - Google Patents

Description

(54) METHOD FOR TREATING THE RING GUTTER OF THE VARIABLE PROFILE OF THE PRODUCT

one

The invention relates to the machining of bulk-shaped products, in particular, to the processing of an annular groove of an alternating profile of products such as rolls for periodic rolling mills.

A known method of treating an annular groove with a variable profile, in which the tool and the product is brought into rotation, is informed by relative return movements on the surface to be machined, passing through the center n}) of the groove and forming angles from 0 to the workpiece axis. up to t, and also carry out synchronous angular displacements of the tool around an axis perpendicular to the axis of rotation of the tool and product 1.

The disadvantage of this method is the low quality of the processed surface of the gutter.

The purpose of the invention is to increase the quality and reduce the complexity of processing the gutter.

The goal is achieved by the fact that the angular displacements of the tool are carried out in the direction opposite to the inclination of the troughs forming in the treatment zone, with

this angle of the tool relative to the product increases from the ridge of the gutter to its edges, based on the following relationship:

Cos

Q where y is the current angle of the instrument relative to the workpiece, glad;

"P is the co-ordinate position of the instrument in the radial section, glad (0h 71);

15K - the taper of the chute in the zone of contact of the tool with the workpiece, rad;

6d - the magnitude of the camber, mm; g - the radius of the profile of the gutter product

along the ridge; mm;

Rrf is the radius of the outer surface of the product (“barrel”) mm; RXP is the average value of the radius of the tool edges relative to its axis, mm.

FIG. 1 shows a processing scheme for a roll type product; in fig. 2 - the same, side view; in fig. 3 is a section A-A in FIG. 1 (on an enlarged scale); in fig. 4 a cross-section of the roll and tool in an intermediate position with an angular coordinate; in fig. 5 - sweep gutter and roll roll in control sections.

A workpiece such as roll 1 is rotated and machined with a cutting tool 2, for example, an abrasive wheel, the profile of which is made as an arc of a circle of radius g. On the workpiece roll 1, an annular groove is processed. The processing is carried out at relative reciprocating movements of the workpiece roll 1 and tool 2 in a plane passing through the axis of rotation of the workpiece roll and the point O of intersection of the axis of rotation of the cutting tool with the plane on which the curvature centers O lie, the tool profile, and the reciprocating movement of the workpiece relative to the cutting tool, the rolls are produced along the normal m NN to the arc of an imaginary circle of radius R equal to the sum of the depth of the groove T in this section and half of the technological value of the gap d.

R T + D / 2.

At each turn of the workpiece roll 1, point O of tool profile 2 moves between points A and B of the N – N normal, the distance of which is from the center of curvature O of the wound, respectively, the differences of the largest and smallest values of radius R and radius of curvature of the profile of tool G

OA Rmax-r,

OB R

mm

At the same time, synchronously with the rotation of the workpiece of the roll 1, the cutting tool 2 is informed by the angular displacement of the correction around the Y-Y axis and the passage of the tongs through the point Oj perpendicular to the axis of rotation of the workpiece of the roll 1.

To ensure that the chute is machined and the roll rolls up in one operation, the splitting is performed by further cutting the chute profile by means of an angular movement, for example, a rejuid, of its tool around the YY axis in the direction opposite to the slope of the forming grooves (conventionally not shown) in the treatment area, this angle of inclination of the cutting tool relative to the workpiece roll increase from the ridge of the chute to its edges, and - the angle

tool slope is determined according to the formula

- mc iMoHi Rd / R; r

 ,

0, & 4ST5 THy g

where y is the angle of inclination of the tool at the edge of the groove of the workpiece roll, glad; K - the taper of the groove in this section of the workpiece roll, glad; So - the size of the roll fork ();

G radius profile roll chute

ridge in this section, .mm;

Rrf - outer surface radius

roll, mm;

 - average value of the radius of location of the cutting edges of the tool relative to its axis, mm.

When the tool bypasses the radial section profile of the groove, the angular displacement of the tool is changed in accordance with the law

Vo

where cf is the angular coordinate of the position of the tool in the radial section of the chute, measured from one of the edges of the sides of the chute (I 0 when machining the edge of the chute, "f X / 2 is the ridge of the chute, g 1 is the edge of the other side of the chute), glad;

y is the current angle of inclination of the tool relative to the workpiece of the roll for the current value of the angle H, rad

Thus, by changing the angle, it is possible to treat the entire surface of the product chute.

Below is a numerical example of determining the angle of inclination of the tool required for machining the helix at the edges of the groove of & 5 2 mm in one of the control sections of the roll (Fig. 4) of radius g 25 mm in an area with a taper of K 0.05 ("; 2 ° 52):

 / 3 / V

 K - V

cf o

0, fl4375 R | g

1 / ZHGGSHOTNmG

L /

o, os Y 0,8

, 84375-

0.043 happy - 2 ° 28,

where R 150 mm is the outer radius

roll surface; R 135mm - the average value of the radius of the cutting edges of the tool.

When traversing the profile of the radial section, of the groove, the value of the angle is 56

new instrument movements are changed by the law of cosine

at Kcf -cos, the table shows the values of the angular

where V, is the current angle of inclination of the tool-displacements of the tool g when bypassing the post relative to the roll blank; The radial cross section of the workpiece is from "P - the angular coordinate of position 5 of the left edge (cf 0) to the right edge of the tool in the radial section (s) of the groove.

From the table and FIG. 5 shows that when machining the ridge of the chute (h i- / 2) the tool is not deployed, i.e. -if O, and when machining the edges of the chute, the tool is deployed respectively Hay ,, j, - 228 and -Ye, + 2 ° 28

In accordance with the smooth change of the instrument's reversal from 0 ° on the crest of the gutter to ± 2 ° 28 on its edges, additional 992164

NII profile, counted from the left edge (Fig. 4).,

The sweeping gutter also smoothly changes from 0 (on the ridge) to 6–2 mm (at the edges) of the gutter.

FIG. Figure 5 shows a roll of the roll across its outer diameter with a camber at the edges of & J ,, 5pj, ..., & op in roll control sections 1,2, ..., 2, p, as well as the position of the tool at the transverse bypass the gutter. If, in synchronization with the rotation of the product, the angle of rotation of the tool is controlled when processing the rammer at the edges of the groove so that the ramifications of the required values (brb, .-, & tt), i.e., turn the tool into corners (Y, o. UZO -Vtto) ™ provides continuous processing of the entire roll profile with the required amount of razvalki. Such control of the tool rotation in accordance with the predetermined values of the ramifications at the edges of the gutter in the control roll sections can be carried out either mechanically, for example, from a copier, appropriately designed, or from a drive mechanism controlled by a computer. Thus, the proposed method allows to improve the quality of the processed surface of the gutter. Formula of the Invention A method of processing an annular groove of an alternating product profile in which the tool and the product are rotated inform them of relative reciprocating movements along the normal to the surface surface, passing through the center of the groove profile and composing angles within the axis of the workpiece From O doTi, and also carry out synchronous angular displacement of the tool around an axis perpendicular to the axes of rotation of the tool and the product, characterized in order to increase the quality and reduce the labor intensity gutter machining, moving the tool in the direction opposite to the inclining chute in the working area, when the tool is tilted, the parts increase from the ridge of the gutter to the edges, based on the following relation: Jv - W G Y 0.84575-R g yJ - current angle tilt tool relative to the workpiece, glad; ff is the angular coordinate of the position of the tool in the radial section, rad; K - the taper of the gutter in the zone of contact of the tool with the workpiece, product, glad; & d - the size of the camber, mm; g is the radius of the profile of the groove of the product ridge, mm; R is the radius of the outer surface of the product (“barrel”, mm; Yang is the average value of the radius of location of the cutting edges of the tool relative to its axis, mm. Sources of information taken into account in the examination of the USSR Copyright Certificate of the USSR 15628, cl. B 24 B 5/16, 1976.

J

FIG.

Claims (1)

A method of processing an annular groove of a variable product profile, in which the tool and product are rotated, inform them of relative reciprocating movements along the normal to the surface being machined, passing through the center of the groove profile and making angles ranging from O to% with the axis of the workpiece, and also carry out synchronous angular movement of the tool around an axis perpendicular to the axis of rotation of the tool and product, characterized in that, in order to improve quality and reduce the complexity of processing both the angular movement of the tool is performed in the direction opposite to the slope 5 in processing with forming the trench area, wherein the angle of inclination of the tool relative to the product increasing from the crest to the trough of its edges, using the following relationship: • COS Cp, where Uy is the current tilt angle of the tool ₁₅ and relative to the workpiece, rad; from? - the angular coordinate of the position of the tool in the radial section, rad; K - taper trough in the contact zone of the tool with the workpiece, product, rad; 8 ₀ - the size of the product, mm; g — the radius of the profile of the groove of the product to the crest, mm; - R ^a D ^and U ^{from the} outer surface of the product ("barrel"), mm; Heb ^{- the} average value of the radius of the location of the cutting edges of the tool relative to its axis, mm Information sources, 30 taken into account during the examination