CN100436050C

CN100436050C - Automatic positioning device for full automatic balancing machine cutting point

Info

Publication number: CN100436050C
Application number: CNB2007100692290A
Authority: CN
Inventors: 曾胜; 吴殿美; 楼荣伟; 杨全勇
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2007-06-07
Filing date: 2007-06-07
Publication date: 2008-11-26
Anticipated expiration: 2027-06-07
Also published as: CN101077565A

Abstract

The automatic cutting point locating equipment for automatic balancing machine includes a movable worktable, a cutting head, a cutting tool, a rotor fixture, an insulating plate between the movable worktable and the cutting head, a rotating spindle in the cutting head, a DC power source with positive pole connected through a brush and a limiting resistor to the rotating spindle and negative pole connected to the fixture, and a monolithic computer. During operation, the cutting head driven with the movable worktable moves toward the rotor. The monolithic computer outputs one high level when the cutting tool does not contact with the rotor or one low level after the cutting tool contacts, so as to locate the cutting point. The present invention has simple structure and less environment influence.

Description

Automatic positioning device for full automatic balancing machine cutting point

Technical field

The present invention relates to a kind of automatic positioning device for full automatic balancing machine cutting point, especially the automatic detection and location device of the contact point of heavy cutter and processed rotor is removed in cutting.

Background technology

Electric tool is important production and daily necessities.There is amount of unbalance in its rotor owing to be subjected to the influence of material, manufacturing process and assembling.When rotor is rotating, can produce vibration like this, bring noise, shorten harmful effect such as life of product, even bring danger, therefore must carry out dynamic balancing its rotor.

During electric tool was produced, the calibration equipment of its rotor dynamic balancing can be divided into two big classes, promptly manual dynamic balancing machine and the full-automatic balancing machine proofreaied and correct.Manual to proofread and correct the dynamic balancing machine cost lower, but production efficiency is low, and balance quality is not high yet, and more to the cutting of rotor, and then the weakening of its electric property causes motor performance to degenerate, and can not satisfy the needs of High-efficient Production high-quality motor.In contrast to this, full-automatic balancing machine then production efficiency is contour, and the balance quality height can be optimized the rotor cutting, but the machine price is more expensive relatively.Along with the development of China's electric tool industry, adopt full-automatic balancing machine to become inexorable trend at present.

Problem of cutting tool when the key issue that full-automatic balancing machine will solve is the rotor cutting particularly is exactly to judge cutter in which position contacts with rotor when the rotor cutting goes to weigh, and just looks for cutting feed point.For general machining apparatus, as lathe and milling machine etc., what adopt usually is that the trial cut method is determined cutter position.Promptly under the manual method of operation, slow travelling table, and the situation that contacts of observing cutter and workpiece are waited to find have iron filings to fly out, and can be heard after the sound, think that then cutter and workpiece have fully contacted, and carry out following process as the initial point of processing.Adopting this mode, on the one hand is that precision is difficult to guarantee, the operator's that places one's entire reliance upon experience level, and this method also is only applicable to the tool setting to the single-piece workpiece on the other hand, and in enormous quantities, high-speed processing mode obviously is inapplicable.

Through investigating, full-automatic balancing machine both domestic and external manufacturer, what generally adopt is acquiescence benchmark mechanism.Particularly be exactly for same type, same batch rotor only carries out the tool setting location to a rotor, and all rotors are thereafter all given tacit consent to the contact point that this benchmark is cutter and workpiece.Cutter goes heavily rotor, and that effectively contact from milling cutter and rotor begins to do radial cutting.How to judge that effective contact point has determined the degree of depth of cutting, thereby directly influence balance quality.Thing followed problem is exactly because the rotor diameter that the technological problems in the rotor processing causes is inconsistent or when having out-of-roundness, when laying the clamp wear of rotor, the excessive or too small inaccuracy of cutting output will take place go heavy problem.And work as cutting at one time and can not go fully heavily, also need be when same position cuts once more, owing to machined away a part of profile that changes rotor, will can not find benchmark and, finally can not finish heavily in the phenomenon that same position cuts repeatedly.

Document-" research of heavy system and key technology thereof is gone in the dynamic balancing numerical control " " electromechanical engineering " 2005 22 volumes 5 phase 4-8 pages or leaves, the method that provides is the resistance of judging between cutter transfer, because that resistance can become suddenly when rotor contacts with cutter is very little (is contact resistance R → O), can judge effective contact point by catching this saltus step, this method is fairly simple, but circuit wherein passes through between cutter head and the knife bar and bearing and knife bar, during the knife bar high speed rotating, have one deck oil film between knife bar and its bearing, though can utilize the capacity effect of oil film to produce a circuit loop, but also introduced High-frequency Interference, thereby influenced the reliability of loop signal, adopt other circuit filtering interfering so have to again, the result makes complex system.

Summary of the invention

The object of the present invention is to provide a kind of simple in structure, be easy to realize, the reliability height, can adapt to the automatic positioning device for full automatic balancing machine cutting point of rotor out-of-roundness and clamp wear.

For reaching above-mentioned purpose, the technical measures that the present invention takes are to detect the tool setting point with the mode that the DC circuit closed loop detects.

Automatic positioning device for full automatic balancing machine cutting point of the present invention, the travelling table that comprises machine, cutting head, be installed in the cutting tool on the cutting head rotary main shaft, the anchor clamps of grip roll, it is characterized in that between travelling table and cutting head, being lined with insulation board, the rotary main shaft of cutting head links to each other with the positive pole of dc source with current-limiting resistance by brush, the negative pole of dc source links to each other with the ground of anchor clamps and single-chip microcomputer, a pin of single-chip microcomputer links to each other as the tie point of input with brush and current-limiting resistance, and another pin of single-chip microcomputer is as the output output signal.

Rotor is clamped on the anchor clamps, and then rotor also links to each other with the negative pole of dc source, and cutting head can move to rotor under the drive of travelling table during work.When cutting tool did not contact with rotor, single-chip microcomputer was output as high level, and when cutting tool touched rotor, single-chip microcomputer was output as low level.Decision level saltus step from high to low just can find the tool setting point.

Go heavy tool setting device to compare with existing rotor, beneficial effect of the present invention is:

1) simple in structure, the reliability height is easy to realize.

2) cutting tool setting point detects at any time, has avoided the fixedly various shortcomings of presetting cutter method, has reduced the requirement to the rotor out-of-roundness, has reduced the processing request of anchor clamps.

3) adopt brush to transmit direct current signal, avoided exchanging tool setting and transmitted the shortcoming of signal, reduced the influence of environmental disturbances with unsettled oil film electric capacity.

Description of drawings

Fig. 1 is an automatic positioning device for full automatic balancing machine cutting point schematic diagram of the present invention;

Fig. 2 is the signal processing flow figure of single-chip microcomputer inside.

The specific embodiment

Further specify the present invention below in conjunction with accompanying drawing.

With reference to Fig. 1, automatic positioning device for full automatic balancing machine cutting point comprises the travelling table 1 of machine, cutting head 3, be installed in the cutting tool 13 on the cutting head rotary main shaft 4, the anchor clamps 12 of grip roll 11, dc source 7 and single-chip microcomputer 8, between travelling table 1 and cutting head 3, be lined with insulation board 2, like this, cutting head 3 is by insulation board 2 and travelling table 1 electric insulation, the rotary main shaft 4 of cutting head closely contacts with brush 5, rotary main shaft 4 links to each other with the positive pole of current-limiting resistance 6 with dc source 7 by brush 5, the negative pole of dc source 7 links to each other with the ground of anchor clamps 12 and single-chip microcomputer 8, and a pin of single-chip microcomputer 8 links to each other with the tie point of brush 5 with current-limiting resistance 6 as input, and another pin of single-chip microcomputer 8 is as the output output signal.During work, by single-chip microcomputer output level from high to low saltus step can find the tool setting point.

Because cutting tool is at the iron filings that can adsorb in the middle of the working angles under some cuttings, these iron filings also can rotate at a high speed along with the rotation of cutter, thereby the existence of these iron filings makes many interference components that mixed in the activation signal can't distinguish actual activation signal, for this reason, above-mentioned single-chip microcomputer can adopt the PIC series monolithic with delay function, for example PIC16F873A.Fig. 2 illustrates the signal processing flow figure of single-chip microcomputer inside, when single-chip microcomputer begins to be consecutively detected low level more than 3 milliseconds from high level, thinks and has found cutting tool setting point, can outwards export the tool setting signal; When single-chip microcomputer begins to be consecutively detected high level more than 5 milliseconds from low level, think and withdrawed from the tool setting point.

Claims

1. automatic positioning device for full automatic balancing machine cutting point, comprise travelling table (1), cutting head (3), be installed in the cutting tool (13) on the cutting head rotary main shaft (4), the anchor clamps (12) of grip roll (11), it is characterized in that between travelling table (1) and cutting head (3), being lined with insulation board (2), the rotary main shaft of cutting head (4) links to each other with the positive pole of current-limiting resistance (6) with dc source (7) by brush (5), the negative pole of dc source (7) links to each other with the ground of anchor clamps (12) and single-chip microcomputer (8), a pin of single-chip microcomputer (8) links to each other with the tie point of brush (5) with current-limiting resistance (6) as input, and another pin of single-chip microcomputer (8) is as the output output signal; Cutting head moves to rotor under the drive of travelling table during work, and when cutting tool did not contact with rotor, single-chip microcomputer was output as high level; When cutting tool touched rotor, single-chip microcomputer was output as low level, and decision level saltus step from high to low just can be located cutting point.