CN201201080Y

CN201201080Y - Self-tapping apparatus

Info

Publication number: CN201201080Y
Application number: CNU2008200986218U
Authority: CN
Inventors: 杜柳青; 黄志明; 杨艳飞; 殷驰; 武晓乐; 何华仙
Original assignee: Chongqing Institute of Technology
Current assignee: Chongqing Institute of Technology
Priority date: 2008-06-20
Filing date: 2008-06-20
Publication date: 2009-03-04
Anticipated expiration: 2018-06-20

Abstract

The utility model discloses an automatic tapping device. A main shaft motor drives a main shaft to rotate through a speed reducer. A feed shaft stepper motor is connected to a feed shaft. The improvement of the automatic tapping device is that the automatic tapping device also comprises a programmable controller and a PG module; the main shaft is provided with a position coder which is connected to the programmable controller to convert the speed of the main shaft into an impulse signal which is sent to the programmable controller; the programmable controller is connected to a positioning module and sends a signal simultaneously to a main shaft motor so as to control the positive and negative rotations and the stop of the main shaft motor; and the PG module is connected to a feed shaft stepper motor through a stepper motor driver. The automatic tapping device is simple in structure, can be made to be small, is convenient to operate and maintain, and is low in cost.

Description

A kind of self-tapping device

Technical field

The utility model relates to machining equipment, specifically refers to a kind of self-tapping device, belongs to the Machining Technology field.

Background technology

Screw tap has hand usefulness and machine with two kinds, can hand tapping also can use the lathe tapping.Hand tap generally cuts by special spanner when using, and production efficiency is low, simultaneously the bad assurance of precision.And the machine rigid tapping need remain the speed of mainshaft at tapping process and becomes fixed proportion with feed shaft speed, and main shaft is whenever goed around, and the feeding total amount of feed shaft equals the pitch of screw tap, thereby guarantees the tapping precision.Even the change in location that angle that the main shaft that causes owing to inertia, acceleration and deceleration time constant difference, the fluctuation of load rotates or feed shaft move does not influence machining accuracy yet, because angle of eccentricity and feed shaft feeding are synchronous.Reach such effect, must utilize certain feedback procedure just can remain the speed of mainshaft and feed shaft speed is proportional.And present machine rigid tapping equipment is Digit Control Machine Tool, common structure of numerically controlled machine-tool complexity, profile is huge, and floor space is big, the control principle profundity, Operation and maintenance are all inconvenient, operator's requirement also than higher, be the most important thing is, cost an arm and a leg, tens0000 yuan at least, better, automaticity height, machining accuracy high up to hundreds thousand of units.

The utility model content

At the prior art above shortcomings, the purpose of this utility model provides a kind of simple in structure, programme convenient, low-cost self-tapping device.

The technical solution of the utility model is achieved in that a kind of self-tapping device, comprise main shaft, spindle motor, feed shaft and feed shaft stepper motor, spindle motor rotates by the decelerator drive shaft, the feed shaft stepper motor is connected with feed shaft, it is characterized in that: it also comprises Programmable Logic Controller and locating module (PG module), described main shaft is provided with position coder, position coder is connected with Programmable Logic Controller and the speed of mainshaft is converted into pulse signal sends Programmable Logic Controller to, Programmable Logic Controller is connected with locating module and transmits signal simultaneously to the rotating of spindle motor control spindle motor with stop, and locating module is connected with the feed shaft stepper motor by stepper motor driver.

Compared to existing technology, the utility model is simple in structure, can do smaller and more exquisitely, and Operation and maintenance all make things convenient for, and the most important thing is low price.

Description of drawings

Fig. 1-the utility model tapping control principle figure;

Fig. 2-the utility model structural representation;

Fig. 3-Fig. 2 vertical view;

Fig. 4-circuit interconnect pattern.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Referring to Fig. 1, from the figure as can be seen, self-tapping device of the present utility model, comprise main shaft, spindle motor, feed shaft and feed shaft stepper motor, spindle motor rotates by the decelerator drive shaft, the feed shaft stepper motor is connected with feed shaft, its improvement is: it also comprises Programmable Logic Controller (PLC) and PG module (locating module), described main shaft is provided with position coder, position coder is connected with Programmable Logic Controller and the speed of mainshaft is converted into pulse signal sends Programmable Logic Controller to, Programmable Logic Controller is connected with locating module and transmits signal simultaneously to the rotating of spindle motor control spindle motor with stop, and the PG module is connected with the feed shaft stepper motor by stepper motor driver.

The utility model implementation is to have installed position coder additional on main shaft (power output shaft), the angular position feedback of main axis rotation is formed position closed loop to PLC, simultaneously set up synchronized relation with Z axle (feed shaft) feeding, like this with regard to strict guarantee the linear ratio relation of main axis rotation angle and Z axle feeding size.Spindle motor adopts threephase asynchronous machine, and its start and stop and rotating are controlled by PLC, and the motion of spindle motor is transferred on the main shaft through decelerator, and screw tap is installed on the main shaft.Though decelerator has fixing gearratio, because the influence of factors such as the gap of driving-chain, motion impact, fluctuation can appear in the rotating speed of main shaft.The speed of mainshaft detects in real time with position coder, and the speed of mainshaft is converted into umber of pulse is sent to PLC, delivers to the X0 interface of PLC during transmission, has adopted the PLC of Mitsubishi here.PLC is connected with the PG module of a special disposal pulse signal.The tach signal that position coder collects is sent into PLC through after calculating, and PLC sends pulse command to the PG module, converts the rotating speed of stepper motor to by PG module controls stepper motor driver, advances thereby drive feed shaft.So just the movement relation of energy strict guarantee spindle motor and feed shaft stepper motor is attacked and is made the screw thread that meets precision.

Tapping process is: F.F.-worker advances-worker moves back-rewind down, corresponding F.F. put in place the signal and the worker advances, the worker moves back, rewind down puts in place, and signal is sent by PLC and the feeding pulse of control step motor.

The utility model is simple in structure, and volume is little, and one-shot forming can be attacked different thread, only needs to revise corresponding stepper motor feed speed parameter in the PLC program.PLC is adopted in control, low price, and the synchronized relation of main shaft and feed shaft is realized by the PLC internal processes, changed when main shaft disturbs rotating speed, respective change also can take place in the feed shaft amount of feeding, keeps the linear ratio relation forever, control reliable and stablely, guarantee machining accuracy.

Fig. 2 and Fig. 3 are the utility model frame for movement.As can be seen, the utility model female cone thread processing equipment major part is made up of spindle motor 1, decelerator 2, feed shaft stepper motor 3, position coder 4, slide unit 5, main shaft 6 and body 7 from the figure.

During operation, press start button, spindle motor (asynchronous machine) 1 starts, and power is transferred to main shaft 6 through decelerator 2.The real-time rotating speed of position coder 4 feedback power output shafts is to PLC, and PLC sends corresponding pulsed drive feed shaft stepper motor 3 rotations again, and the rotation of feed shaft stepper motor 3 drives slide unit 5 motions by screw-nut body 8, thereby finishes corresponding feed motion.Decelerator 2 adopts synchronous belt drive mechanism.Position coder adopts coaxial mounting means on power output shaft.The motion of power output shaft and stepper motor is got in touch as shown in Figure 2.With the rotating speed of the real-time detection main shaft of position coder, and the speed of mainshaft is converted into umber of pulse is sent to PLC.PLC sends pulse command through calculating to the PG module, converts the rotating speed of stepper motor to by stepper motor driver, thereby is with slide unit motion, so just a movement relation of energy strict guarantee spindle motor and stepper motor.

Fig. 4 is the utility model circuit interconnect pattern, and as shown in Figure 4, the control of spindle motor is controlled auxiliary reclay K1, K2 by PLC, thereby controls spindle circuit by contactor KM1, KM2.The speed of stepper motor and Position Control are controlled by locating module FX2N-1PG, and FX2N-1PG is one of Mitsubishi PLC functional module, but single shaft control, and pulse output maximum can reach 100KB/s.At the characteristics of positioning control, this module has the perfect control parameter to be set, and as localizing objects tracking, the speed of service, creep speed, acceleration and deceleration time etc., these parameters all can be set by the FROM/T0 instruction of PLC.

The PLC input and output point table of comparisons:

Claims

1, a kind of self-tapping device, comprise main shaft (6), spindle motor (1), feed shaft and feed shaft stepper motor (3), spindle motor (1) rotates by decelerator (2) drive shaft (6), the feed shaft stepper motor is connected with feed shaft, it is characterized in that: it also comprises Programmable Logic Controller and locating module, described main shaft is provided with position coder, position coder is connected with Programmable Logic Controller and the speed of mainshaft is converted into pulse signal sends Programmable Logic Controller to, Programmable Logic Controller is connected with locating module and transmits signal simultaneously to the rotating of spindle motor control spindle motor with stop, and locating module is connected with the feed shaft stepper motor by stepper motor driver.