US RE34,155 EGranted

Machining a workpiece in a turret lathe and an NC lathe therefor

AssigneeIndex-Werke GmbH & Co. KG Hahn & Tessky

InventorHelmut F. Link

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Abstract

[A method of] Apparatus for machining a workpiece, which is rotatable about a first axis, by a tool pivotable about a second axis parallel to the first axis and drivable about a third axis perpendicular to the second axis. To allow the circumference of the workpiece to be machined off-center without the necessity of moving the first or the second axis transversely to the plane defined by these two axes, the workpiece and the tool are rotated or pivoted about the first [or] and second [axis] axes , respectively, at the same time, in the same direction and at the same angular velocity and, simultaneously the second axis is displaced transversely to the first axis at such a velocity that the equation X.sup.2 =Y.sup.2 +A.sup.2 always applies, wherein X is the distance of the second axis from the first axis, Y is the distance of the first axis from the plane defined by the second and third axes and A is the distance of the second axis from the vertical projection of the first axis on this plane.

Claims28

Dependent claims

In an NC lathe, comprising a main spindle mounted for rotation in a spindle stock about a main spindle axis;

a main motor for rotatably driving said main spindle about said main spindle axis;
a workpiece chuck means mounted on said main spindle;
a tool turret arranged adjacent said main spindle;
means for rotatably mounting said tool turret;
means for rotatably driving said tool turret about a tool turret axis parallel to the main spindle axis;
said tool turret comprising a turret body and at least one turret spindle for holding a tool rotatably mounted in said turret body;
means for rotatably driving said turret spindle about a turret spindle axis extending radially to the turret axis;
a carriage bearing said tool turret for slidable displacement transversely to the main spindle axis, and a carriage drive for slidably displacing said carriage, the improvement comprising NC control means operatively connected to said main motor, the tool turret driving means, and said carriage drive for effecting controlled, stepless, transverse displacement of the carriage and controlled stepless rotation of the main spindle and of the tool turret such that simultaneously
(a) the main spindle is rotated about the main spindle axis in a defined direction of rotation and with a defined angular velocity of d.gamma./dt;
(b) the turret spindle is rotated about the turret spindle axis;
(c) the turret is rotated about the turret axis in the defined direction of rotation and with said defined angular velocity;
(d) the carriage is displaced transversely to the main
spindle axis at a velocity dX/dt said velocities being the first derivatives of the following equations:
##EQU3## wherein t, .gamma., X, A, Y.sub.o, and v.sub.y denote the following:
t=the time which is equal to zero when a tool carried by said turret spindle touches a workpiece carried by said chuck means for the first time;
.gamma.=the angle between the turret spindle axis and a first plane defined by the main spindle axis and the turret axis;
X=the distance of the turret axis from the main spindle axis;
A=the distance of the turret axis from the normal projection of the main spindle axis onto a second plane defined by the turret axis and the turret spindle axis, which plane pivots about the turret axis;
Y=the distance of the main spindle axis from said second plant, with Y.sub.o being the value of Y when t equals zero;
v.sub.y =the feed velocity dy/dt of the turret spindle axis relative to the main spindle axis in the direction of diminishing values of Y.

17 more elements

In an NC lathe, comprising a main spindle mounted for rotation in a spindle stock about a main spindle axis;

a main motor for rotatably driving said main spindle about said main spindle axis;
a workpiece chuck means mounted on said main spindle;
a tool turret arranged adjacent said main spindle;
means for rotatably mounting said tool turret;
means for rotatably driving said tool turret about a tool turret axis parallel to the main spindle axis;
said tool turret comprising a turret body and at least one turret spindle for holding a tool rotatably mounted in said turret body;
means for rotatably driving said turret spindle about a turret spindle axis extending radially to the turret axis;
a carriage bearing said tool turret for slidable displacement transversely to the main spindle axis, and a carriage drive for slidably displacing said carriage, the improvement comprising NC control means operatively connected to said main motor, the tool turret driving means and said carriage drive for effecting controlled stepless transverse displacement of the carriage and controlled stepless rotation of the main spindle and of the tool turret such that simultaneously
(a) the main spindle is rotated about the main spindle axis in a defined direction of rotation and with a defined angular velocity d.gamma./dt;
(b) a turret spindle is rotated about the turret spindle axis;
(c) the turret is rotated about the turret axis in the defined direction of rotation and with said defined angular velocity;
(d) the carriage is displaced transversely to the main spindle axis at a velocity dX/dt
said velocities being the first derivatives of the following equations:
##EQU4## wherein t, .gamma., X, Y, A.sub.o, and v.sub.A denote the following:
t=the time which is equal to zero when a tool carried by the turret spindle touches a workpiece carried by said chuck means for the first time;
.gamma.=the angle between the turret spindle axis and a first [plant] plane defined by the main spindle axis and the turret axis;
X=the distance of the turret axis from the main spindle axis;
A=the distance of the turret axis from the normal projection of the main spindle axis onto a second plane defined by the turret axis and the turret spindle axis, which plane pivots about the turret axis, with A.sub.o being the value of A when t equals zero;
Y=the distance of the main spindle axis from said second plane;
V.sub.A =the feed velocity dA/dt of the turret body relative to the main spindle in the direction of diminishing values of A.

17 more elements

In an NC lathe including a main spindle mounted for rotation in a spindle stock about a main spindle axis;

motor means for rotatably driving said main spindle about said main spindle axis;
a workpiece chuck means mounted on said main spindle;
a tool turret arranged adjacent said main spindle;
means for rotatably mounting said tool turret;
means for rotatably displacing said tool turret about a tool turret axis parallel to the main spindle axis;
said tool turret comprising a turret body and at least one turret spindle for holding a tool rotatably mounted in said turret body;
means for rotatably driving said turret spindle about a turret spindle axis disposed in a plane perpendicular to the tool turret axis;
slidable carriage means and a carriage drive for effecting relative displacement between said tool turret and said main spindle in a direction transverse to the axes thereof, the improvement comprising:
NC control means operatively connected to said motor means, the means for rotatably displacing said tool turret and said carriage drive for effecting controlled, stepless, transverse displacement of the carriage and controlled stepless rotational displacements of simultaneously, during machining by said lathe:
(a) said main spindle is displaced about said main spindle axis in a defined direction of rotation to provide predetermined continuous angular displacement of said main spindle and said chuck means;
(b) said turret spindle is rotated about said turret spindle axis;
(c) said tool turret is displaced about said tool turret axis in said defined direction of rotation and with the same continuous angular displacement as said main spindle and said chuck means, whereby said turret spindle axis is maintained perpendicular to a predetermined plane parallel to said main spindle axis and rotating with said workpiece chuck means during such rotational displacement of said main spindle and said tool turret;
and
(d) said relative displacement is effected between said tool turret and said main spindle in a direction transverse to the main spindle axis to effect relative positioning of said turret spindle in a direction parallel to the first spindle axis and thus perpendicular to said predetermined plane in a predetermined manner while performing such machining.

11 more elements

In an NC lathe including a main spindle mounted for rotation in a spindle stock about a main spindle axis;

motor means for rotatably driving said main spindle about said main spindle axis;
a workpiece chuck means mounted on said main spindle;
a tool turret arranged adjacent said main spindle;
means for rotatably mounting said tool turret;
means for rotatably displacing said tool turret about a tool turret axis parallel to the main spindle axis;
said tool turret comprising a turret body and at least one turret spindle for holding a tool rotatably mounted in said turret body;
means for rotatably driving said turret spindle about a turret spindle axis disposed in a plane perpendicular to the tool turret axis;
slidable carriage means and a carriage drive for effecting relative displacement between said tool turret and said main spindle in a direction transverse to the axes thereof, the improvement comprising:
NC control means operatively connected to said motor means, the means for rotatably displacing said tool turret, and said carriage drive for effecting controlled, stepless, transverse displacement of the carriage and controlled stepless rotational displacements of the main spindle and of the tool turret such that simultaneously, during machining by said lathe:
(a) said main spindle is displaced about said main spindle axis in a defined direction of rotation and with a defined angular velocity;
(b) said turret spindle is rotated about said turret spindle axis;
(c) said tool turret is displaced about said tool turret axis in said defined direction of rotation and with said defined angular velocity whereby said turret spindle axis is maintained perpendicular to a predetermined plane parallel to said main spindle axis and rotating with said workpiece chuck means during such rotational displacement of said main spindle and said tool turret;
and
(d) said carriage is displaced in a direction transverse to the main spindle axis at a displacement velocity to effect relative positioning of said turret spindle in a direction parallel to the turret spindle axis and thus perpendicular to said predetermined plane in a predetermined manner
while performing such machining.

12 more elements

An NC lathe including a spindle stock;

a main spindle mounted for rotation in said spindle stock about a main spindle axis;
a workpiece chuck means mounted on said main spindle;
driving means for rotatably displacing said main spindle about said main spindle axis;
NC control means operatively connected to said driving means for effecting controlled rotational displacement of said main spindle in a defined direction about said main spindle axis during machining operation of said lathe;
a rotatable tool turret arranged adjacent said main spindle;
means for rotatably displacing said tool turret about a tool turret axis parallel to said main spindle axis;
said tool turret comprising a turret body, at least one turret spindle and means for holding a tool in said spindle for rotation about a turret spindle axis disposed in a plane extending generally normal to said tool turret axis;
a drive for rotating said turret spindle about said turret spindle axis to effect such machining operation;
means for controlling said tool turret displacing means and for thereby effecting controlled rotational displacement of said turret spindle axis in said defined direction about said tool turret axis simultaneously with and with the same rotational displacement as said main spindle during such machining operation whereby said turret spindle axis is maintained perpendicular to a predetermined plane which is parallel to said main spindle axis and rotating with said workpiece chuck means during such machining;
and
carriage means and a carriage drive associated with said tool turret and said main spindle and responsive to said NC control means for effecting controlled, stepless, relative displacement between said tool turret and said main spindle in a direction transverse to said main spindle axis to position a tool mounted in said tool holding means of said turret spindle in a direction along said tool spindle axis in a predetermined manner simultaneously with such rotational displacement of said turret spindle axis and main spindle during such machining of a workpiece in said chuck by said tool,
whereby off-center machining may be performed by said lathe without a feed motion of the tool turret relative to said workpiece chuck in a direction generally normal to said direction of relative displacement between said tool turret and said main spindle.

9 more elements

Dependencies are inferred from the claim text.