CN2865993Y

CN2865993Y - Dynamic cutter carrier unit head positioning automatic controller

Info

Publication number: CN2865993Y
Application number: CN 200520079744
Authority: CN
Inventors: 李维谦
Original assignee: Tianshui Xinghuo Machine Tool Co Ltd
Current assignee: Tianshui Xinghuo Machine Tool Co Ltd
Priority date: 2005-11-17
Filing date: 2005-11-17
Publication date: 2007-02-07
Anticipated expiration: 2015-11-17

Abstract

The utility model refers to an automatic control device for locating power head of power cutting saddle during high-speed milling in CNC turning center, which is comprised of CNC control unit, PLC controller and a cutting saddle assembly including a cutting saddle assembly, cutter, quill servo motor, reduction gear, zero-bit detection switch, position detection switch and brake electromagnet. In addition, a zero-bit detection switch is installed in the back of CNC cutter saddle and equipped with a PLC to process the logic control of automatic locating for power head, thus realizing real-time management on the brake electromagnet and switch-on state of electromagnet and collecting zero-bit signal position and feeding back the position to CNC control unit in time. Here, CNC controls operating state of quill servo motor in real time. As the motor speed reduction stops, it is feasible to brake as the speed approximates to zero relying on brake electromagnet, and then recheck zero-bit switches till locating point. Upon completion of a cutter locating, the cutter saddle replaces cutter and power cutter saddle revolves to next new working position.

Description

Power knife rest unit head location automatic controller

Technical field:

The utility model relates to numerical control turning center power knife rest control system, relates in particular to the automaton that adds power knife rest unit head location in man-hour at the numer centre high-speed milling.

Background technology:

At present, most of numerically controlled lathe knife rests adopt common rotating tool-carrier, can only realize the automatic tool changer of eight stations or twelve-station.When carrying out Milling Process on request, on numerically controlled lathe, machine turning, and then turn to CNC milling machine to carry out milling, need operate workpiece manually, cause operative employee's labour intensity big, service working time is long, and workpiece is difficult for the location, be easy to generate position error, directly influence machined surface quality and working (machining) efficiency.

Summary of the invention:

Main purpose of the present utility model is to utilize the unit head of numerically-controlled slide to rotate to be implemented in the processing request of finishing turning and milling on a machine tool.Specifically, be equipped with one at the numerically-controlled slide rear portion and detect the sensor that power knife rest rotates, putting a PLC programmable controller handles unit head and locatees logic control automatically, the position of stopping for the unit head standard is provided with sense switch, monitor the unit head position in real time, and realize that by control program the unit head standard stops control, overcome the deficiency that tradition adds man-hour.

For realizing described purpose, the technical scheme that its technical problem that solves the utility model adopts is: power knife rest unit head location automatic controller comprises the CNC control module, the PLC controller, and a knife rest assembly of forming by knife rest assembly, cutter, main axle servo motor, reduction gearing, zero-bit sense switch, position detecting switch, Breake Electromagnet, constituted a complete automatic control system.On the knife rest unit head, be provided with the zero-bit sense switch, and position detecting switch and Breake Electromagnet; Be electrically connected between Breake Electromagnet and the reduction gearing, main axle servo motor and reduction gearing, and be connected to cutter by the knife rest unit head.Working method is when the deceleration of main axle servo motor stops, rely on the effect of Breake Electromagnet, speed begins near zero-speed, brake, detect the zero-bit switch again, until arriving anchor point, behind the location of finishing a cutter spacing, knife rest begins tool changing, seeks new cutter spacing, and power knife rest begins to rotate to next station.

Control circuit is realized knife rest location logic control by the PLC controller; Built-in and the connection PLC controller of CNC control module, its output port connects the input of main axle servo motor, the output of main axle servo motor connects the reduction gearing input, the output port of PLC controller connects the Breake Electromagnet input, the Breake Electromagnet output connects the reduction gearing input, the output of reduction gearing is connected to the input of knife rest position rotaring motor by a position detecting switch, output 1 end of knife rest assembly connects the reduction gearing input, export 2 ends and be connected to CNC control module input port by zero signal, export 3 ends and connect zero-bit sense switch input, zero-bit sense switch output connects the input port of PLC controller.

Described CNC control module connects the CNC control module by the internal bus cable, the information of CNC control module is in time read in the PLC internal processor, by logic control program real-time management brake solenoid that enrolls in advance and electromagnet "on" position, gather the position of zero signal, feed back to the CNC unit in real time, through the running status of CNC central interior processor real-time control main axle servo motor.

Described PLC controller mainly is the bridge that connects CNC control module and Breake Electromagnet and zero signal switch.

The CNC control module reads in the order of new replacing power-driven cutter head from procedure, and detect current cutter spacing location status, judge whether new cutter spacing meets current cutter spacing, if testing result is for being, then the power cutter with power knife rest rotates, and enters the subsequent processing program; If testing result is for denying main axle servo motor reduction of speed.Detect spindle speed and whether be lower than the tachometer value that program is determined, it is 15rpm that spindle speed is lower than the definite tachometer value of program, if testing result is not, and the time-delay reduction of speed; If the result who detects is for being that the PLC controller sends parking order, follow procedure reduction of speed, the signal of searching position detecting switch.After the time delay that pre-sets among the PLC, detect the zero-bit switch and whether put in place, if testing result is for being, the power knife rest deceleration stops, and just in time stops to zero-bit, knife rest begins tool changing, seeks new cutter spacing; If testing result is not, the CNC control module produces fault alarm, and interrupts next step performing a programme.

The beneficial effects of the utility model are positioning control of realization power knife rest that can be convenient and reliable, satisfy that Digit Control Machine Tool is efficient, the requirement of High-speed machining, reduced energy consumption, saved tool change time, and alleviated labor strength, improved the reliability of operating efficiency and knife rest work.

Description of drawings:

Fig. 1 is the structural representation of power knife rest assembly

Fig. 2 is the connection diagram of power knife rest register control

The specific embodiment:

The utility model is described in further detail below in conjunction with drawings and Examples;

Referring to Fig. 1, figure intermediate slide assembly 1, cutter 2, main axle servo motor 3, reduction gearing 4, zero-bit sense switch 5, position detecting switch 6, Breake Electromagnet 7; Zero-bit sense switch 5 is installed on the knife rest unit head, and position detecting switch 6 and Breake Electromagnet 7; Breake Electromagnet 7 connects reduction gearing 4, and main axle servo motor 3 connects reduction gearing 4 and is connected to cutter 2 by the knife rest unit head.Working method is when the deceleration of main axle servo motor stops, rely on the effect of Breake Electromagnet, speed begins near zero-speed, brake, detect the zero-bit switch again, until arriving anchor point, behind the location of finishing a cutter spacing, knife rest begins tool changing, seeks new cutter spacing, and power knife rest begins to rotate to next station.

Referring to Fig. 2, built-in and the connection PLC controller of CNC control module among the figure, its output port connects the input of main axle servo motor, the output of main axle servo motor connects the reduction gearing input, the output port of PLC controller connects the Breake Electromagnet input, the Breake Electromagnet output connects the reduction gearing input, the output of reduction gearing is connected to the input of knife rest position rotaring motor by a position detecting switch, output 1 end of knife rest assembly connects the reduction gearing input, export 2 ends and be connected to CNC control module input port by zero signal, export 3 ends and connect zero-bit sense switch input, zero-bit sense switch output connects the input port of PLC controller.Its operation principle is that the CNC control module reads in new tool position from procedure, the location status that the PLC controller is gathered current tool position and detected the zero-bit switch, and execution PLC program, judge whether new tool position meets current cutter spacing situation, if, the direct rotational power head of control spindle motor, raising speed enters the subsequent processing program to new speed.If do not meet current gear stage, the PLC controller to the CNC control module, is controlled main axle servo motor parking reduction of speed to feedback information.The zero-bit switch that is connected with main shaft detects unit head speed in real time and whether is lower than 15r/min, if be lower than 15r/min, PLC controller follow procedure is switched on to Breake Electromagnet.After the time delay that process PLC program pre-sets, the PLC controller reads the duty of position detecting switch in real time, judges whether zero-bit, if to zero-bit, CNC control module control power cutter rotates to new cutter spacing; If engagement does not put in place, CNC control module control main axle servo motor begins reduction of speed to 15rmp, reaffirms whether zero-bit puts in place, if zero-bit puts in place, whole exchanging knives process is finished.The tool changing of PLC controller reporting CNC control module is finished, and begins to start next step performing a programme, if zero-bit can not put in place always, the CNC control module produces fault alarm, interrupts next step performing a programme.Show corresponding fault message and repair message on the CNC control module man-machine interface.

Claims

1, a kind of power knife rest unit head is located automatic controller, comprise CNC control module (8), PLC controller (9) and a knife rest assembly of forming by knife rest assembly (1), cutter (2), main axle servo motor (3), reduction gearing (4), zero-bit sense switch (5), position detecting switch (6), Breake Electromagnet (7); It is characterized in that: on the knife rest unit head, be provided with zero-bit sense switch (5), and position detecting switch (6) and Breake Electromagnet (7); Be electrically connected between Breake Electromagnet (7) and the reduction gearing (4), main axle servo motor (3) and reduction gearing (4), and be connected to cutter (2) by the knife rest unit head.

2, power knife rest unit head according to claim 1 location automatic controller, it is characterized in that: control circuit is built-in and connection PLC controller (9) by CNC control module (8), its output port connects the input of main axle servo motor (3), the output of main axle servo motor (3) connects reduction gearing (4) input, the output port of PLC controller (9) connects Breake Electromagnet (7) input, Breake Electromagnet (7) output connects reduction gearing (4) input, and the output of reduction gearing (4) is connected to the input of knife rest position rotaring motor by a position detecting switch (6); Output 1 end of knife rest assembly (1) connects reduction gearing (4) input, export 2 ends and be connected to CNC control module (8) input port by zero signal (10), export 3 ends and connect zero-bit sense switch (5) input, zero-bit sense switch (5) output connects the input port of PLC controller (9).

3. a kind of power knife rest unit head according to claim 1 location automatic controller, it is characterized in that: it is 15rpm that spindle speed is lower than the definite tachometer value of program.