US 4,543,635 A · Process and switching circuit for the positional control of radial drilling machines

Abstract

A process is disclosed for automatically positioning the drill spindle over a workpiece at a predetermined location defining the bore center, wherein the shop drawing and the workpiece bore centers are defined as to their locations in different coordinate systems and wherein the invention provides for calculating and measuring steps to transform between the various coordinate systems. The invention discloses also apparatus for practicing the process by employing a controller-arithmatic unit which carries out the coordination of the plurality of logic circuits and the effecting the use of a programmed performance of the process including the teaching or updating of the program for new bores.

Position control system for a radial drilling tool machine with a drill spindle having a centerpoint P, a carriage beam having a center of rotation K, said system comprising:

(a) means for storing a control and arithmetic program to be performed, said control and arithmetic program including programmed mathematic formulae for determining a desired position of the center point P of a drilling spindle in relation to predetermined base points of a workpiece in a rectangular coordinate system employing the following relationships:
##EQU7## wherein:
the value of R is measured from the center of rotation K of the carriage beam;
a magnitude of an angular coordinate A is measured from a base position of a straight line r.sub.k of the carriage beam;
r.sub.p =a straight path swept by the center point of the drill spindle during the movement of the drill carriage on the carriage beam;
r.sub.k =a straight line parallel with the straight line r.sub.p and passing through the point of rotation of the carriage beam;
K.sub.p =a distance between the parallel straight lines r.sub.k and r.sub.p ;
R.sub.p =a radial coordinate value of the centerpoint of the drill spindle;
A.sub.p =an angular coordinate value of the centerpoint of the drill spindle;
R.sub.o =a radial coordinate value of the origin;
A.sub.o =an angular coordinate value of the origin;
R.sub.xy =a length of the vector pointing from the origin to the centerpoint of the drill spindle;
A.sub.xy =an angle of the vector pointing from the origin to the centerpoint of the drill spindle with respect to the X axis;
X=an x coordinate value of the centerpoint of the drill spindle;
Y=a y coordinate value of the centerpoint of the drill spindle;
said drilling spindle being actuated in a radial coordinate system given by an axle of rotation of a carriage beam and a base straight line crossing said axle of rotation, said carriage beam having a straight line guiding path for said drilling spindle parallel to a straight line crossing the axle of rotation,
(b) means for storing a processing program to be performed in order to actuate said drilling spindle for preparing bores in predetermined points of the workpiece,
(c) means for measuring a relative position of said drilling spindle to said base straight line and said axle of rotation and generating measurement signals corresponding to the actual position of said drilling spindle,
(d) means for testing a plurality of switching, controlling and regulating elements of the radial drilling tool machine, said testing means generating status signals, and
(e) means for controlling said plurality of switching, controlling and regulating means, said controlling means generating actuating signal wherein, said control and arithmetic program storing means, said processing program storing means, said relative position measuring means and said testing means are coupled by address lines, data lines and control lines with means for processing said programs, measurement and status signals, determining the relative position of said drilling spindle and generating control signals for said controlling means.

17 more elements

Process and switching circuit for the positional control of radial drilling machines

Life of this patent

Process and switching circuit for the positional control of radial drilling machines

Life of this patent

Abstract

Claims12