SU1355368A1 - Method of correcting the axis of preliminary machined hole - Google Patents

Abstract

The invention relates to metal cutting and can be used to correct the axes of the holes, the coordinates of which are not specified. The aim of the invention is to expand the technological capabilities and increase the accuracy of the location of the hole axis by ensuring its correction when the hole axis is located on both sides of the tool's axis of rotation. Axis of rotation Eat the axis from the barrier and eliminate the displacements of these axes when the smoothing cam enters the pre-machined hole. The tool 1 is reported to axially move until its cutting edge touches the edge of the pre-machined hole, measure the hole coordinates in advance, and in the direction of rotation set the tool cutting edge at the clamping point with the edge of the machined hole at an angle to the plane passing through the axis of the previously machined hole and corrected axis. Then the tool is moved to the closing of the smoothing cam 2 with the edge of the previously machined hole. Due to the amount of lagging in the axial direction of the smoothing cam 2 relative to the peripheral point 3 of the cutting edge 4, the tool begins to move. 1 hp ff, 8 ill. 5 (L CO SP 01 CO 05 00 Fi. {IE.2

Description

11355368

The invention relates to metal cutting and can be used to correct the axes of the holes, the coordinates of which do not correspond to the specified.

The purpose of the invention is to expand the technological capabilities and improve the accuracy of the position of the hole axis by ensuring its correction 10 by placing the hole axis on either side of the tool’s axis of rotation and eliminating the displacements of these axes when the smoothing cam enters the pre-machined hole.

Figure 1 shows a schematic of a pre-machined hole with an error of positional expansion until a penetrating cam 2 comes into contact with the opening edge of part 5, the tool continues to move forward, the cam begins to enter the hole (FIG. 3), cutting edge in addition to the axial feed, it starts radial, plunging into the wall of the hole. The graph (Fig. A) shows the nature of the entry of the smoothing cam 2 into the pre-machined hole and then the established treatment process.

At the initial moment at (f o there is a pretreated

verst of radius

R -: SRO - 2

in that

25

thirty

torque (fig. 3) smoothing cam of axle position; FIG. 2 shows the schematic of the 20 starting to contact with the edge of the process when the tool edges touch the edge of the previously machined hole; on fig.Z - the same, at the moment of contacting the NIN of the smoothing cam, the edges of the previously machined hole; Fig. 4 is a graph of a tool incision; figure 5 - the shape of the hole when Cf ,, 6 86 °; figure 6 - the same: at C) 5 180 °; in fig. 7 is a schematic of the orientation of the cutting edge of the tool in the case of obtaining the shape of a hole in the form of two segments of Archimedes spirals and two arcs of circles; fig. B - the same, in the case of obtaining the shape of a hole in the form of two segments of Archimedes spirals at y 0.

Received pre-processed. hole with the positional error of the axis. This may be a centered hole or a drilled hole. It is necessary to correct the hole axis О to position 0 | .

35

hard In addition to the longitudinal feed, the tool begins to receive the transverse, and any point of the cutting edge begins to describe some helix. The projection of this line onto a plane perpendicular to the axis of the hole is an Archimedes spiral.

This picture is observed when the instrument is rotated through an angle from O to Tg (section 0-1 in Fig. 4 is an Archimedes spiral in a rectangular coordinate system). In this area there is an increase in radius by

AR

.s-tgiP

2

40

Further, when the tool rotates at an angle (about f fT to 21G, the smoothing cam 2 (FIG. 2) contacts the hole area that was formed half a turn back. The tool has a similar radial feed

When machining holes, the one-sided cutting volume at the beginning of machining shows the following picture. When the tool 1 is axially fed (figure 2), due to the presence of the face distance h, where h, - is the amount of lagging of the smoothing cam 2 in the axial direction relative to the peripheral point 3 of the cutting edge 4, the cutting edge comes into contact with the edge of the pre-machined hole. 4 Tool 1 due to low radial rigidity with axial feed begins to shift

to the right until the viewer cam 2 comes into contact with the hole edge of the part 5, the Tool continues to move forward, the cam begins to enter the hole (FIG. 3), the cutting edge, in addition to the axial feed, starts cutting into the hole wall. The graph (Fig. A) shows the nature of the entry of the smoothing cam 2 into the pre-machined hole and then the established treatment process.

At the initial moment at (f o there is a pretreated

verst of radius

R -: SRO - 2

in that

The Oment (Fig. 3) smoothing cam begins to contact with the edge of the

hard In addition to the longitudinal feed, the tool begins to receive the transverse, and any point of the cutting edge begins to describe some helix. The projection of this line onto a plane perpendicular to the axis of the hole is an Archimedes spiral.

This picture is observed when the instrument is rotated through an angle from O to Tg (section 0-1 in Fig. 4 is an Archimedes spiral in a rectangular coordinate system). In this area there is an increase in radius by

AR

.s-tgiP

2

Further, when the tool rotates at an angle (about f fT to 21G, the smoothing cam 2 (FIG. 2) contacts the hole area that was formed half a turn back. The tool has a similar radial feed

due to the presence of the longitudinal feed and the contacting of the smoothing cam with the hole, but the cam slides in a spiral of Archimedes, having a parameter equal to the radial feed.

Increasing the hole radius does not occur. On the graph (figure 4) this section 1-2 is depicted by a line parallel to the axis O Cf.

The pattern of alternating plots

Archimedes' spirals and circular arcs are observed until equality i o, i.e. until the smoothing cam is fully inserted into the hole and a steady hole is started. At the same time, on any turnover of the instrument, i.e. At C) ZIT (section 5-9), hole sections consisting of segments j (yr circles (sections 5-6 and 7-8) and Archimedes spirals (sections 6-7 and 8-9) are observed. The shape of such a hole is The consistency is depicted in the polar coordinate system, (Fig. 5). The limiting cases are cases when the sections of Archimedes spirals 6-7, 8-9 are zero (line B in Fig. 4 is a perfect circle) and the cases when sections of circles 5-6, 7-8 are equal to zero (curve B in Fig. 4). The hole in Fig. 6 consists of Archimedes spiral segments.

The angle If is determined from the expression

Vo

e. 2ir

 S tgtf

If a circle is inscribed into the hole (Figures 5 and 6), then the center of this circle 0 к ke does not coincide with the center of the previously obtained hole 0. This circumstance allows the hole axis to be corrected. The magnitude of this correction can be equal to the general case when a smoothing cam enters the hole, the value of & c is the amount of displacement — it depends on the value of D — the value of the final radius increment along the length of the Archimedes spiral segment (the central angle Vj of the Archimedes spiral section).

The value and is determined by the formula

;. .z.ld5 .-. ,,,

where () is the central angle of the plot

Archimedes spirals ,, For the case (Fig. 5) with (f 86, the value of L ,, is determined by the formula

D, .S tgcf, g-- | - - ri; 7- -3% {i-in (-sT | i.36o)

(DC Ls

DC-L

() (1 +)

For the case (fig. B), when the shape of the aperture is represented by cutting of Archimedes' spirals, it is determined as follows: Ls 0,22-S tgtf.

This formula can be approximately used in case 130. To correct the axis of the bore hole (Fig. 1) to the O position, it is necessary to first measure the coordinates of the axis of the previously machined hole (point 0) and limit the magnitude and direction of the correction. Then the tool is informed of movement (FIG. 2) along the axis of the pre-machined hole until the cutting edge 4 closes with the edge of the hole and orient this cutting relative to; the plane of correction - the plane passing through the points O and 0 | along

the bore axis is at an angle (determined by (Fig. 5) from

(

-V,

Where

V, 27 fs-f - 27,

- {ss l.

where cf

The formula for determining the angle (f is valid for (-e 86, i.e. for

Hi - - ° - After orientation of the cutting edge at an angle (axial movement of the tool is performed until it closes with the edge of the previously machined opening of the smoothing cam 2 (Fig. 3). Then, the relative rotation and working feed is simultaneously reported to the tool or workpiece, the feed is determined are from the ratio presented to determine the value of A ..

From this expression, it is also possible to determine the parameters of the tool Dj to provide the required amount of correction. , H or allowance.

During processing, the shape of the hole shown in FIG. 5 is obtained. In this case, the center of the hole obtained is the center of the inscribed circle O, i.e. the hole axis was corrected from point O to given point O by an amount D.

To simplify calculations or when 86 ° - Hz can be used

the edges of the tool with the edge of the hole and inform the parts and the tool of the relative rotation and axial displacement, characterized in that, in order to expand tehnol. following the measurement of the coordinates of the axis of the preliminary 10 but machined hole, the magnitude is determined and the direction of the correction is set in the direction of rotation of the cutting edge of the tool at the closing point with the edge of the preliminary

scheme shown in Fig.6. This 15 machined hole for

case, the cutting edge of the tool is oriented in the plane of correction, and the feed is determined from the expression

UC

S

0,22- tgM

then, the number of revolutions until the tool is completely inserted from the ratio

P

S titf

 In view of the fact that this scheme (Fig. 6) is valid when the tool is inserted in 0.5; 1.5; 2.5 turns, then n is rounded up to

n - (2k-l),

where k is an integer equal to 1,2,3 .. Thereafter, the value of the problem is specified g

S

n, tgq

and processing is performed while simultaneously informing the tool or part of the rotation and working feed,

Claims (2)

Invention Formula one . The method of correcting the axis of a pre-machined hole with a single-blade tool with a smoothing cam, at which the hole coordinates are measured, moves the tool relative to the part along the axis of the hole until the cutting edge closes. 3553686 the edges of the tool with the edge of the hole and communicate the details and tool. relative rotation and axial displacement, characterized in that, in order to expand technological capabilities and increase the axis positioning accuracy, after measuring the coordinates of the axis of the pre-machined hole, determine the magnitude and direction of the correction, set in the direction of rotation the cutting edge of the tool at the closing point with the edge of the pre ---. angle to the plane of the pre-machined hole passing through the axis and the corrected axis determined from the ratio  TG 1 9 lliiligilJ :, (f.  - Processing allowance; H - angle sharpening smoothing cam; S. - feed. wherein thirty §4-H- ° then move the tool to the closing of the smoothing cam with the edge of the pre-machined hole. 35 2. The method according to p. I, about tl and h and i and the fact that, in order to obtain the shape of the hole, made in a spiral of Archimedes, the cutting edge 40 of the tool is additionally oriented in the direction opposite to the direction of correction at an angle Cf O and the processing is carried out with the feed rate determined from the following 45 S -L .., n tgtf where n g (2k-l) is the number of revolutions d 50 complete incision k is an integer equal to 1,2,3. Fig.Z F: / e. if RuwgKpgm noostei Spirals Lrhimed Spirate Ap ibsa Fi9.5 5 // arr / y0df7effi / e ffOfl / yefft ut / Fiop / jent ua plane Peftfyufoff ff / jaMffa FIG. 7 f / a / 7 a ef cfe ffo / yflefftiut / f / racffffcfrrtf n oppe tft / u flyoa ffcf Compiler G.Sirotovska Editor S.Lisina Tehred L.Serdyukova Proofreader V, Girn K Order 5743/12 Circulation 970 Subscription VNIIPI USSR State Committee on d "the evils of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG. at