SU1313582A1 - Method of machining holes - Google Patents

Abstract

The invention relates to methods for metal cutting and can be used to obtain holes in the walls of a pipe-type workpiece. The aim of the invention is to expand the technological capabilities by using a single tool in the machining of a hole in a blank, such as a pipe, whose axis intersects with the axis of the blank. The processing is carried out in two passes, in the first of which the axis of the tool 4 and the axis of the hole 2 are positioned at an angle aS to each other and with an offset L relative to the axis of the workpiece 1, then the tool is informed about the rotation and feed movement. After the end of the first pass, a second pass is made, in which the axis of the tool 4 and the aperture 2 are aligned. 4 il. FIG. 2 (L 2 Position. Position t

Description

113

The invention relates to metal cutting and can be used to produce holes in the walls of a pipe-type workpiece.

The purpose of the invention is the expansion of technological capabilities by using a single tool when machining a hole in a billet like a pipe whose axis intersects with the axis of the billet.

FIG. 1 shows a diagram of the relative position of the workpiece and the tool during the final formation of the hole; 2 - the same, before the start (position I) and after the end (position II) of the first pass; in FIG. 3, view A in FIG. 2; in fig. 4 is a view B in FIG. 3

In a thin-walled billet 1 of the pipe type, it is necessary to process a through hole 2 with a diameter d with an axis of 0-0 rotating tool 3 located a distance from the M – M axis of the workpiece. Improving the efficiency of this tool when cutting a hole in solid material with an exact cutter and eliminating Drilling a hole of a smaller diameter is possible when machining a hole in two passes of a tool, the radius g of rotation of which is equal to half the diameter d of the hole. In the first pass, a preliminary opening is obtained, which ensures a free passage of the tool body with the final formation of the opening 2 by a cutter 3 during the second pass. Before the first pass, the workpiece 1 is positioned in such a way that the axis 0-0 of the hole 2 is at an angle oi, to the axis o-O of rotation of the tool, and the last is at a distance L from the axis m -M of the workpiece.

The rotary tool 3 or part 1 is informed of the relative displacement S (or Sg, respectively, before the end of the contact of the cutter 3 with the workpiece 1. In this case, the line obtained by intersecting the plane passing through the 0-0 and O – O axes with the cylinder formed by the tip of the rotating the cutter 3, within the outer contour of the workpiece, forms a chord, the magnitude of which should not exceed the value of the choir RQ (the points R and Q are the intersection points of the forming hole 2 with the outer contour of the workpiece). After the first passage in the workpiece con

22

N and P in the outer and inner walls of the workpiece, the small XY axis of the hole P should not be less than the diameter d of the tool body 4 in order to ensure the free passage of the latter during the final processing of the hole 2.

Before the second pass, the workpiece is turned about an angle, and the axis 0-0

the holes are aligned with the axis O-O of rotation of the tool. The rotating tool 3 or the workpiece 1 is reported to have a relative axial displacement of Si, or S-, respectively, and the hole 2 is finally machined to the size of diameter d.

To derive the calculated dependencies, the scheme in FIG. 2

From the center of the workpiece - point M, line MB is drawn, parallel to the axis 0-0 of hole 2. about /. Mbb.

The MVB triangle is similar to the RQH triangle. L HQR rev. From HQR triangle

": Arctg

RH HQ

thirty

 - hole diameter. From the MCR triangle

CR 4MR2 - MS;

t-,

MS SK + KM - | + a;

CR

-W

) 2 (+ a).

From triangle MFQ

FQ - MF;

MQ -I-;

d

MF KF-KM 2 - a;

FQ therefore:

j-Y - (-5- - a)

t i arctg

iW M | fD, f / d

11tG1t 1 Zht)

(I)

During the first pass, the chord obtained at the intersection of the plane passing through the 0-0 and O – O axes with the cylinder formed by the tip of the rotating tool 3 should not

313135824

exceed the chord value of QR. Outgoing Of the joint solution of inequalities

from this condition, the mini- (2) and (3) is determined to obtain the maximum value of L:

 four

LiTE + MT; l) 4 L;

d4) - (-.- p)

TE g 2..

Claims (2)

Formula of the invention In an equilateral () triangle RMQ RT TQ. ° The method of machining the holes of the era-prj j is an instrument that is carried out. Since RQ exists in two passes, and with In the second pass, the tool axis, together with RT 2. сirinf, is placed with the hole axis, about 5 and 5, in order to From the triangle of MRT technological expansion it is possible, when machining the hole in the tooling of the pipe type, the axis of which is re, is cut, with the axis of the workpiece, with the first. d + -. (.1.) 2 () 2 (2) ° aisle the tool axis is located 2 h 2 2.sinoi. Dig at an angle to the axis of the hole and with Based on the condition that the hole is displaced relative to the axis of the workpiece, P must not be less than d, the angle is determined by tool housings to provide 25 free passage of the latter at o6 arctg,. , , g-- . . . . final processing of the hole 2. (Hl) 2- (- a) J (- -) (- + a) at the second pass set 2 12 2 the dependence of L and dj: pdg angle of relative position , EP axes of aperture and rotaryT M7 4-7P l nz, -g /, and. (, d instrument; From XZO triangle Diameter of the hole to be machined; ZO -J (Xo) - (XZ). outer diameter of the workpiece; ,, a is the magnitude of the displacement of the axis of the opening 2, -ti relative to the axis of the bout. are thin where D is the inner diameter of the part 1. and the offset of the tool axis is chosen within. (d HO g.40 g- 2-Di, bd ,,, d, f2.f2,4 -y + For free passage of the mandrel condition must be met XZ i .45 Consequently: where D is the internal diameter of the workpiece L e + l | F ki; d, is the diameter of the tool. and (3) receive  four  l) 4 L;  g-  bd ,,, d, f2.f2,4 ki; d, is the diameter of the tool. Q & t / e. / 2 X / 0Ut. J Vib 6 Editor A. Orap Compiled by S. Wer Tehred M. Hodannch Order 2161/11 Circulation 976 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 (JOf / e. Proofreader E.Roshko