FR2512714A1 - METHOD AND MACHINE FOR SHAVING BOTTOM OF TEETH FLANGES OF A WORKPIECE - Google Patents

Abstract

A. THE INVENTION RELATES TO A PROCESS AND A MACHINE FOR SHAVING THE FLANKS OF TEETH OF A TOOTHED PART 16 WITH A SHAVING WHEEL 9 MOUNTED ON A FEED CART 5 SLIDING IN A GUIDING BRACKET 4 SWIVELING ON A PLATE PIVOTANTE 3 GUIDED BY A RULE 21. THE PROBLEM SOLVED CONSISTS OF ALLOWING FREE CHOICE, WITHOUT SIGNIFICANT EXPENDITURE, OF THE SIZE AND THE FORM OF THE BONBEMENT. B. THE PROCESS IS CHARACTERIZED IN THAT THE DISTANCE BETWEEN RULE 21 AND THE ADVANCE CART 5 ARE MODIFIED AS A FUNCTION OF THE CYCLE OF ADVANCE BACK-AND-BACK MOVEMENT AND RULE 21 IS MAINTAINED PERMANENTLY PARALLEL WITH THE GUIDING THE FEED CARRIAGE 5 IN THE GUIDING BRACKET 4. C. THE INVENTION IS APPLICABLE TO THE BOMB SHAVING OF THE GEAR WHEELS.

Description

The invention relates to a method for convex shaving of tooth flanks

  a toothed blank part which is mounted in a rotating but stationary rotary shaving gear finishing machine with a shaving wheel mounted for rotary drive in a shaving head which, in view of crossing axes between rough and shaving wheel, is mounted on a feed carriage adjustable by rotation about a vertical axis perpendicular to the axis of the blank part, this carriage being sliding back and forth in a support of guide for a longitudinal feed, this guide support being pivotally mounted on an axis arranged transversely to the direction of advance, which, for its part, is supported in a

  pivoting plate which can be pivoted and locked in position

  around an axis perpendicular to the axis of the blank piece.

  che, and which is guided with a control by a slide or a similar member provided on the pivot plate, an installation being provided for the modification of the distance between axes

  between the shaving wheel and the blank part.

  The present invention is applicable to a machine for machining finishing gear wheels, of the type described in DE-OS 29 27976 The convex shape of the tooth flanks to be obtained with known machines can not be varied, with the However, the use of curved guidance rules is itself limited for reasons of construction and the use of a linear guide rule.

cost.

  Accordingly, the present invention aims to

  to propose a process and a machine for its implementation

  with which the size and shape of the bulge of the tooth flanks can be chosen and modified freely

and without significant expense.

  To this end, the invention relates to a method of the above type, characterized in that the distance between the ruler and the feed carriage is changed as a function of the forward-and-back feed cycle and is maintained. the rule permanently parallel to the guidance of the feed carriage in the

guiding support.

  According to another characteristic of the invention, it is also possible to modify the distance between the axes of the shaving wheel and the blank as a function of the cycle.

  going back and forth from moving the piece in advance.

  The invention extends to a machine for the implementation of this method characterized in that the rule and the feed carriage are interconnected by means of a threaded spindle with a spindle nut, the spindle threaded

  can be driven by a servo motor.

  In view of the production of curved flanks of teeth,

  it is necessary that the shaving wheel is inclined, in function

  desired bulge, relative to the blank part The size of this inclination can, according to the invention,

  to be modified, according to the cycle of back-and-forth movement

  in advance, by varying the distance between the

  advance carriage and the guide rail, for example by'in'in-

  of a pulse transmitter, connected to the

  command, for example numeric, of the machine, and which causes a change of this distance according to the race in advance

  traveled in order to obtain impeccable shaving results

  it is desirable that the shaving wheel be oriented

  permanently perpendicular to the portion of denten ques-

  This condition is realized in that the guide rule is maintained, always parallel to the guide of the feed carriage in the guide support, that is to say

  parallel to the direction of movement in advance.

  The invention will be better understood with regard to the

  description below and the accompanying drawings showing a

  Embodiment of the invention, drawings in which Figure 1 is a perspective view of the assembly of the shaving head, the feed carriage and the guide rule;

  FIG. 2 is an elevational view of the

  appears from Figure 1; Figures 3 to 5 show the advance stroke in different positions of the carriage; Figure 6 is a schematic representation of the tool in different positions for a normal bulge

teeth.

  On a vertical carriage 1 vertically adjustable

  gears shaving machine (not shown).

  felt) is mounted a position adjustment carriage 2 (Figures 1 and 2), which consists essentially of three parts

  movable relative to each other, namely a pivot plate

  aunt 3, a guide support 4 and an advance carriage The pivoting plate 3 is mounted in a pre-set circular guide in the vertical carriage 1 to be pivotable and immobilized in position about a vertical axis 7. In this way, the direction of advance 8, 8 ', 8 ", of the shaving wheel 9 can be adjusted at will during shaving parallel,

diagonal or lower.

  On the pivoting plate 3, is hung on an axis 10, the guide support 4 so as to tilt about a horizontal axis 11 The guide support 4 receives the advance carriage 5 on its underside, in a On this lower face, the shaving head 8, with the shaving wheel 9, is received, so as to be rotatable about a vertical axis 14, in a circular guide 13 for the purpose of adjusting the angle of intersection between axes The elongate guide 12 is directed transversely to

the axis 11.

  Facilities for the movement of

  advance carriage 5 are known per se, as are the instal-

  4 for the pivotal adjustment of the plate 3 or the shaving head 15, and are not described or shown in the drawings. Beyond the shaving wheel 9, and in engagement with it, the blank part 16 is mounted, in known devices, not shown, so as to be able to rotate, but with a stationary position. The feed carriage 5 is provided with end, an arm upwardly, adjustable in length, in the form of a threaded spindle 19, engaged in a spindle nut 18, and on the free end of which is mounted a rule

  21 This rule 21 can rotate and be immovable

  bilized in position on the head 20, about a horizontal axis

  22 which extends parallel to the tilting axis 11.

  The swivel plate 3 is provided with an extension

  23 on the free end of which is rotatably articulated

  free a slide 24, in which is guided the rule 21.

  On a support 25 connected to the head 20 is arranged a servo

  motor 26, which drives the threaded spindle 19, through

  The servomotor 26 is connected to the control of the shaving machine via a transmitting member.

pulses of known type.

  In the middle and normal position of the shaving wheel 9, the length of the threaded spindle 19 can be adjusted so that the feed carriage is horizontal. The rule 21 is also horizontal at a distance 28 from the carriage (FIG. and 3> If the feed carriage moves to the right or to the left (arrow X), it moves in

  a plane parallel to the axis of the blank piece For the realization

  The threaded spindle 19 is displaced during the forward movement to the left in the direction of a shortening of the distance between the feed carriage 5 and the rule 21. that the feed carriage and the guide support 4 are forced to perform, around the axis 11, a slight pivoting movement in the opposite direction to that of the clockwise The rule 21 is then deflected in the Y direction and the shaving wheel 9 is tilted (or deflected) O (relative to the blank part 16.

  When continuing to reduce the dis-

  During the forward movement to the left, the shaving wheel moves on a curve in the form of a circular arc (FIG. 6) with an arc height HA at the end of the advance stroke. then the maximum inclination d, and the

  distance 28 is at the same time reduced to a minimum 28 '(Figure 4).

  When the following inversion of the direction of advance X, the distance between the carriage 5 and the rule 21 is

  again increased by reversing the direction of rotation of the servo-

  motor 26 and the threaded spindle 19 The inclination has the

  shaving wheel 9 is then decreased.

  When the starting state according to FIG. 3 is reached again, the shaving wheel is again vertical and is ready to take an inclination in the other direction, while continuing the advance movement to the right and an increase in the distance 28, caused by the slight pivoting of the feed carriage 5 in the direction of the needles

of a watch.

  At the end of the race in advance, she presents to

  again its maximum inclination d and, at the same time, the

  tance 28 is increased to its maximum (28 "in FIG. 5).

  The rotational displacement of the threaded spindle 19 is controlled by a pulse transmitter which is

  connected with the general order, for example a numerical order

  This unit switches on and off, and switches the servo motor 26, in the reciprocating feed cycle, and according to modifiable criteria of the advance stroke traveled. every moment, or other

possible conditions.

  The shape of the curve described by the shaving wheel 9 may be further varied, by means of a displacement of the adjustment carriage superimposed on the advance movement X, in direction Z, that is to say in the direction a reduction in the distance between axes or its increase.

  a relation of H B depending on (X, Y, Z).

  Of course, changing the distance 28

  between the advance carriage and rule 21 can also start

  cer only when a part of the advance stroke B has been performed In this case only the ends of the teeth are executed in curved form On the other hand, if the modification of the distance 28 is completed before the entire race

  beforehand B is performed, the ends of the teeth end

  However, it is important that, in each case, any change in the distance in one of the advance directions, corresponds to a change exactly opposite each location of the advance stroke in the opposite direction. The invention is not limited to the embodiment described here of a shaving machine with shaving wheel disposed above the blank part, but it is applicable to all shaving machines and other machines for comparable operations gear finishing, in which the roughing piece is mounted stationary and o all necessary movements are performed by the machining tool. RE V ENDICATI 0 NS 1) Process for the convex shaving of the tooth flanks of a toothed blank part which is mounted in a machine for finishing shaving gear wheels, rotating but stationary, with a shaving wheel mounted, for training

  in rotation, in a shaving head, which, with a view to

  axis between roughing and shaving wheel, is mounted on

  a feed carriage adjustable by rotation about a vertical axis

  cal perpendicular to the axis of the blank part, this carriage being sliding back and forth in a guide support for a longitudinal feed, this guide support being pivotally mounted on an axis arranged transversely to the direction of advance, which, for its part, is supported in a pivoting plate which can be pivoted and immobilized in position about an axis perpendicular to the axis of the blank part, and which is guided with a rule by a slide or a similar member provided on the pivoting plate, an installation being provided for the modification of the distance between axes between the shaving wheel and the roughing part, characterized in that the distance (28) between the rule (21) and the advance carriage is modified (5) according to the advance travel cycle in

  back and forth and the control unit (21) is permanently

  aligns with the guidance of the feed carriage (5) in the support of

guiding (4).

  2) Process according to claim 1, characterized by

  in that the axial distance between the shaving wheel (9) and the roughing piece (16) is changed as a function of

  forward travel cycle back and forth.

  3) Machine for the implementation of the method

  according to any one of claims L and 2 characterized

  in that the control unit (21) and the feed carriage (5) are interconnected by means of a threaded spindle (19) with a spindle nut (18), the threaded spindle (19) being driven

by means of a servomotor (26).