SU1284744A1 - Method of two-passage cutting of spur gears - Google Patents

Abstract

The invention relates to the field of mechanical engineering, in particular to the manufacture of gear wheels. The purpose of the invention is to increase tool life when a two-pass cutting of cylindrical wheels with an inlet mill with an intake cone, because when a rough pass is performed with a tangential feed, the teeth are rubbed, which leads to a decrease in cutting forces, temperature increases in the cutting zone and, accordingly, to reduce the resistance of the cutter. With two-pass cutting of gears by the method of two consecutive feeds — tangential and axial, tangential feed (during roughing) is made at an angle to the cutter axis in the plane of rotation of the wheel to be machined in accordance with the rolling motion in accordance with the dependence t spread, where the calculated cutter displacement step when tangential feed, corresponding to the rotation of one tooth, mm; t ,, is the normal modulus, mm; y is the angle of elevation of the orb of the screw-cutting mill, hail ,; - wheel tooth angle, degrees; S is the angle between the direction of feed and the axis of the cutter in the plane of rotation of the wheel being machined, degrees. Cutting gears with a milling cutter with an intake cone, the axis of which forms an angle with the direction of the feed feed, causes the same side cutting edges in the rolling pattern after each revolution of the cutter to form a gap and do not participate in cutting the allowance left from the previous revolution of the cutter for the kinematic errors of the dividing chain of the machine and the deformation of its carrier system, which leads to an increase in durability. The side edges of the same name are cutting edges with an incomplete tooth profile that process one side of the wheel tooth. The angle 8 between the direction of the tangential feed and the axis of the cutter must be sufficient in order to compensate for the deformation errors of the carrier system and the chain of division of the machine. 4 il. § (P l; U

Description

The invention relates to mechanical engineering, in particular to the manufacture of gears.

The purpose of the invention is to increase tool life when two-pass cutting of cylindrical gears with an inlet milling cutter with an intake cone.

When the roughing passage is performed with a tangential feed, the teeth are rubbed, which leads to an increase in cutting forces, an increase in temperature in the cutting zone and, accordingly, to a decrease in the durability of the cutter.

Figure 1 shows the location of the cutter with intake cone and processed wheels; figure 2 is a view of And figure 1; Figs 3 and 4 show the positions of the same cutting edges in the rolling pattern through the cutter's rotation, respectively, for the left and right side of the wheel profile.

With two-pass cutting of gears by the method of two consecutive feeds — tangential and axial, the tangential feed (during roughing) is made at an angle to the cutter axis, measured in the plane of rotation of the wheel to be machined.

At the same time, in order to ensure cutting of spur and helical helical gears, the tangential feed is coordinated with the machine dividing chain, taking into account the urge of raising the cutter coil, the angle of the wheel tooth and the cutter axis in the plane so that

Ilsjj

Where

- calc t

paradise

m

cozy cos-cosS

- the calculated step of moving the cutter at a tangential feed, corresponding to turning on, one tooth, mm;

-module is normal, mm; U. the goal of lifting the coil of a milling cutter, grad .;

/ i - the angle of inclination of the tooth wheels, deg .;

- the angle between the direction of feed and the axis of the cutter in the plane of rotation of the pattern

eight

five

0

five

that the side edges of the same name in the rolling pattern after each revolution of the cutter form a gap and do not participate in cutting off the allowance left over from the previous revolution of the cutter due to the kinematic errors of the machine dividing chain and deformations of its bearing system, which leads to an increase in the cutter’s durability . The same side cutting edges are cutting edges with an incomplete profile of an eub that process one side of a wheel tooth.

The angle S between the direction of tangential feed and the axis of the cutter should be sufficient to compensate for the deformation errors of the carrier system and the machine dividing chain.

For example, for a wheel of 8 degrees of accuracy, the accuracy of the F profile is 0.03 mm. With a threefold margin at the height of the tooth wheel h 2.25 mm, it will be 8 0.5

0

five

0

five

on the basis of

about 3Fi

tg S - Thus, the magnitude of the angle O lies in the range 0.5-3.

Part allowance and. which remains due to the presence of an angle between the axis of the cutter and the direction of the tangential feed, is removed during the finishing pass.

Since the main part of the machined wheel allowance of 90-95% is removed by the cutter teeth located on the intake cone, and the cylindrical part of the mill removes the remaining uneven allowance of 5-10% of the total allowance, it limits the durability of the intake cone of the worm cutter rather than the cylindrical one. part, which is confirmed by experimental verification. Therefore, an increase in tool life as a whole is provided by increasing the tool life of the cutter teeth located on the intake cone.

Claims (1)

50 claims The method of two-pass cutting of cylindrical gears under the conditions of rolling with a worm mill battered wheels, hail. boron cone by the method of two successive cuts of gear wheels 1 by a mill 2 with an intake cone, the axis of which forms an angle of 8 with the direction of tangential feed, leads to tangential and axial feeds, characterized in that, in order to increase tool life, tangential feed tangential and axial feeds, characterized in that, in order to increase tool life, tangential feed 3 produced at an angle to the axis of the cutter in the plane of rotation of the wheel being machined in coordination with the rolling movement in accordance with the dependence - where t /. II Shn racy  COSS - the calculated step of moving the cutter at tangential feed, respectively m driving one wheel tooth, mm; Y is a preference for lifting a worm cutter; (is the angle of inclination of the wheel tooth; the angle between the direction of feed and the axis of the cutter in the plane of rotation of the wheel; the modulus is normal. S S movement (f) UZ.Z Fig.Z FIG.