SU1281414A1 - Made up mounted cylindrical milling tool and method of mounting same - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to woodworking industry, namely to the design and operation of a precast milling tool. The purpose of the invention is to improve the accuracy of the cutter installation and the quality of the machining surface. The cutter includes a housing 1, a corrugated sleeve 5, S 12 U1 13 forming a bore diameter along the inner wall. Between the housing 1 and the sleeve 5, an elastic intermediate sleeve 6 is installed. The face surface of the sleeve 6 has a shoulder 7 with holes 8 for fixing it to the cutter 1 and the slots 9. The sleeve 5 and 6 are eccentric. The cutter is mounted on the spindle 12 until it stops 13 and is fixed with an end nut 14. The sleeves 5 and 6 are positioned so that their eccentricities are compensated. Then, the beat values of the cutter tips of the cutter are measured, the magnitude and the angular position of the average circumference of the knife tips are determined. The center of the average circumference of the tops of the knives is combined with the axis of rotation of the milling cutter. Releasing the nut 14, turn the sleeve 6 relative to the sleeve 5 and the housing 1. Then, the sleeves 5 and 6 are fixed by the slots 9 and the sleeve 6 relative to the housing 1 by the latch 10, fixing with the end nut 14. 2 cf f-ly, 5 ill. SS (L A-A N3 00 4 ::; (rig. G

Description

The invention relates to a milling tool and its operation and can be used in the woodworking industry.

The purpose of the invention is to improve the accuracy of the installation of the cutter and improve the quality of the treated surface.

FIG. 1 shows the cutter, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 section bb in fig. 2; in fig. 4 shows a scheme for implementing a method for installing a milling cutter; in fig. 5 shows a scheme for combining the geometrical axis of the cutter with the axis of rotation of the spindle.

The milling cutter includes a housing 1 with knives 4 fixed with wedges 2 and screws 3, a corrugated sleeve 5 forming a bore diameter along the inner wall. Between the housing 1 and the corrugated sleeve 5, there is installed an elastic intermediate sleeve 6, the end surface of which has a shoulder 7 with holes 8 evenly spaced on it for fixing it relative to the cutter body and splines 9, the sleeves 5 and 6 being eccentrically shaped. In the housing 1 there are a spring-loaded retainer 10 and a locking ring 11. One of the ends of the sleeves 5 and 6 and the housing 1 is graduated.

The cutter is assembled as follows.

The knives 4 are secured in the slots of the housing 1 with wedges 2 and screws 3. The eccentric elastic sleeve 5 is installed in the elastic sleeve eccentricized sleeve 6 and fixed relative to each other with the slits 9. The assembled bushings are installed in the mounting hole of the housing 1 and fixed with a lock a ring 11 and a spring-loaded fixer 10 which fits into one of the holes 8 located on the annular shoulder 7 of the sleeve 6.

The method is implemented as follows.

The cutter is pre-secured in the housing 1 by the cutters 3 mounted on the machine spindle 12 up to the stop 13 and fixed with the end nut 14 (Fig. 2).

The sleeves 5 and 6 are positioned relative to each other in such a way that their eccentricities are compensated for and the axes of the cutter body 1 and the fit hole of the sleeve 5 coincide.

After pre-fixing the cutter on the spindle of the machine using an indicator, rotating the spindle of the machine, measure the beat-cutters of the cutter. The first measured cutter is taken as the base, with respect to which, further, all installation movements are made.

The magnitude and angular position of the eccentricity of the average circumference of the tool tips relative to the axis of rotation of the spindle is determined. For this, the measured values of the radial beats of the incisors are considered

as a periodic with period 2n, continuous and corresponding to the Dirichlet feature of the function. This periodic function is represented by the Furev series. The resulting empirical function is replaced by a set of harmonics with discrete equidistant circular frequencies.

f (x) (HKSO5KF + YKsin KTN) (1) Ro

where is a permanent member of the series;

XK, YK - coefficients p and Fourier;

fn are discrete values of the angle of rotation of the cutter when measuring the magnitude of the beating; N is the harmonic number.

Since the function of radial beating is a function defined by partial discrete values, formulas are used to determine the characteristics of a series;

HKE 6NcosKvj ";

(2)

2 -K

YK, S 6NSin K. tsc.

(3)

2 N

 6N

(four)

(five)

UK

(6)

where N is the number of cutters cutters;

IK is the amplitude of the corresponding harmonic; ak - phase angle;

YN-indications of the indicator during measurement.

The amplitude of the first harmonic of the row (i.e., at 1) is determined in polar coordinates, the magnitude and the angular position of the eccentricity of the axis of the average circumference of the actual measured knife edges and the axis of rotation are measured when measuring the beats of the incisors.

To align the average circumference of the knife tops with the axis of rotation, the axis of the average circumference is transferred by the value of the calculated eccentricity. To do this, turn the sleeve 6 in succession relative to the sleeve 5. In this case, the nut 14 is released. The sleeve 6 together with the housing 1 is moved in the direction of the nut 14. The slotted interface 9 is unlocked, providing the possibility of rotation of the corrugated sleeve 5

relative to the sleeve 6. The sleeve 6 is rotated by an angle P relative to the sleeve 5. Then by twisting the sleeve 6 with the housing 1 to the stop 13 of the spindle 12 fix the spline connection and, therefore, the sleeve 6 relative to the sleeve 5. Shrink the nut 14. By turning the sleeve 6 relative to the sleeve 5, the axis of the average circumference of the cutter tips of the cutter is moved from the center O to the center O {FIG. four).

Then, the housing 1 is turned relative to the sleeve 6 by the angle YP-Dt of this retainer 10 is embedded in the housing 1. The axis of the average circumference of the incisors is moved from the center Oi to the center O2. Thus, a final alignment of the axis of rotation of the spindle with the axis of the average circumference of the incisors takes place.

The angles p and Y "in the production of installation movements are counted according to graduated scales, applied on the periphery of the ends of the sleeves 5 and 6 and the housing 1.

The magnitudes of the angles a and are determined by the formulas:

I (

(3 arc cozy -ccc;

2 aracos l 0.5 (, (8)

where e is the eccentricity of the corrugated sleeve, equal to the eccentricity of the elastic sleeve 6;

ei is the magnitude of the eccentricity of the cutter axis relative to the axis of rotation of the spinners (the amplitude of the first harmonic of the row); R - the angle of rotation of the sleeve b relative

corrugated sleeve 5; 7 - the angle of rotation of the cutter body 1 relative to the sleeve 6. Example. The method is carried out with the installation of a cutter of the proposed design with the number of knives 8, RHOM 60 mm with SN equal to 0.100; 0055; --0.030; -0.025; -0.030; -0.050 0.030 and 0.015 mm, respectively, with y equal to O, 45, ..., 315 °, and RN equal to 60.050; 60.020; 59.97; 60.01; 60.02; 59,985; 60.03 and 59.98 mm. By the formulas (2) and (3), the coefficients of the row Xi are determined to be 0.058 mm; YI 0.016 mm. By the formula (5), the polar coordinate characterizing the value of the eccentricity ef 0.060 mm is determined. The second polar coordinate characterizing the position of the eccentricity a, -3,46 ° is determined by the formula (6).

By the formulas (7) and (8), the angles of rotation of the sleeves 5 and 6 are determined to be 69.08 ° and at 34.9 °.

The actual cutting radii of the knife tops, measured on a 4} cut after the method of installation of the milling cutter, is determined by the formula

RN -d / R ,, oM-f 6) - -f е- -2 {RHov. + 6 ,,) eiCos

CCA

Xl (n-l), (9)

+ when a - when Z / 2; - with a. - at Z / 2; n Z, where Z is the number of cutters cutters.

13x4 60.042 mm.

The cutting radii of the remaining knives are 60,017; 59,974; 60,018; 60.028; 59,993; 60.034 and 59.977 mm, i.e. , „0.066 mm.

Thus, the maximum beating of the cutter knives with eccentricity relative to the axis of rotation is before the beating is eliminated, the value of the incisors after the beating is eliminated by applying the proposed method is one 0.066 mm.

Moreover, the magnitude of the 6N beating is no longer dependent on the eccentric position of the cutter relative to the axis of rotation, but on the deviation of the tips of the incisors relative to the average circumference of their tips, i.e. from the second harmonic of the considered trigonometric Fudier series.

Thus, the application of the proposed design of the cutter and method of its installation. This makes it possible to reduce the absolute value of the radial beat in a particular case by a factor of 2.2.

Claims (2)

1. A milling cutter mounted cylindrical, comprising a housing with fixed knives, a corrugated sleeve, forming a fitting diameter along the inner wall, which, in order to improve the accuracy of the cutter installation and improve the quality of the machined surface, an intermediate elastic sleeve is installed between the cutter body and the corrugated sleeve. , the end surface of which has a shoulder with holes for fixing it relative to the cutter body, and the sleeves are made with eccentricity. 2. The method of installing the milling cutter with the assembled mounted cylindrical one, which consists in installing the milling cutter on a cylindrical niniuid with its subsequent fixation, differs from the fact that, in order to improve the accuracy of the milling cutter and improve the quality of the treated surface, before fixing the milling cutter the radial beats of the tops of the cutter knives, determine the average circumference of the tips of the knives, the magnitude and direction of the eccentricity, then move the sleeves relative to the body by the amount of the calculated eccentricity, combining the center of the It circumference vertices knives cutter axis of rotation, then fixing is performed with respect to the cutter body bushing and the cylindrical spindle. Fig.Z (raga R - 2e FIG. five