CN201584869U

CN201584869U - Rotor dynamic balancer automatic tool setting device utilizing bearing dynamic oil film resistance

Info

Publication number: CN201584869U
Application number: CN2009202953800U
Authority: CN
Inventors: 曾胜; 任意; 程涛涛; 李常品; 张加庆; 楼荣伟
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2009-12-29
Filing date: 2009-12-29
Publication date: 2010-09-15
Anticipated expiration: 2019-12-29

Abstract

The utility model discloses a rotor dynamic balancer automatic tool setting device utilizing bearing dynamic oil film resistance. The rotor dynamic balancer automatic tool setting device comprises a moving table of a machine, a cutter seat, a bearing, a rotary spindle, a cutting tool, a fixture clamping a rotor, a mounting bottom board and a direct current power supply, wherein a positive pole of the direct current power supply is connected with the rotary spindle and a positive pole of a signal acquisition circuit through an electric brush, a negative pole of the direct current power supply is connected with the fixture and a ground pole of the signal acquisition circuit, and the signal acquisition circuit includes two active low-pass filter in cascade connection, an ultralow pass RC filter and a comparator, which are three modules. The tool setting device determines a final tool setting spot from the change of the resistance by utilizing dynamic oil film resistance formed between a bearing inner ring and a bearing outer ring when the rotary spindle rotates, and utilizing the signal acquisition circuit to detect change of the dynamic oil film resistance, has simple structure and high reliability, and can adapt to continuous automatic production requirement.

Description

Utilize the rotor dynamic balancing machine automatic tool preset device of dynamic oil film resistance of bearing

Technical field

The utility model relates to a kind of device that utilizes dynamic oil film resistance of bearing to carry out automatic tool preset, cutting tool and the automatic detection device of processed rotor workpiece contact point, i.e. automatic tool preset device in the especially full-automatic rotor dynamic balancing machine.

Background technology

Motor is important production and daily necessities, and rotor wherein is the important process parts of motor., reasons such as shape asymmetric, process and assemble error inhomogeneous owing to material, the rotor of harsh output exists amount of unbalance inevitably.In the operation process of motor, the dynamic loading that amount of unbalance produces will act on stationary parts, thereby cause vibration, noise and properties of product degeneration.Therefore must carry out dynamic balancing to rotor.

Rotor dynamic balancing calibration equipment in the production can be divided into two big classes, promptly manual rotor dynamic balancing machine and the full-automatic rotor dynamic balancing machine proofreaied and correct.Manual correction dynamic balancing machine cost is low, but its production efficiency is low, equilibrium process relies on workman's experience, general balance quality is not high, and its cutting quantity to rotor is more, cause the rotor electric property to weaken easily motor performance is degenerated, so be difficult to satisfy the production needs of the rotor of high-efficiency high-quality.In contrast to this, full-automatic rotor dynamic balancing machine production efficiency height, the balance quality height can carry out quality optimization to the rotor cutting, but the machine price is more expensive relatively.Along with the development of China's motor industry, adopt full-automatic rotor dynamic balancing machine to become inexorable trend at present.

Full-automatic rotor dynamic balancing machine in working angles, the problem of cutting tool that key issue is cutting tool and rotor that solve.Particularly, when the rotor cutting goes to weigh, judge cutting tool and rotor position contacting first exactly, i.e. tool setting point, and as reference point, thereby control cutting tool amount of feeding control cutting quality.Therefore tool setting point determines that cutting precision is had fundamental influence.

For general machining apparatus, as lathe and milling machine etc., what adopt usually is that the trial cut method is determined the tool setting point.Promptly under manual operational mode, slowly travelling table, and the situation that contacts of observing cutting tool and workpiece, wait to find have iron filings to fly out, and can hear after the sound, think that then cutter has contacted with workpiece, write down this point as tool setting point or processing basic point, carry out follow-up processing.This mode can't realize in enormous quantities and high-precision production because the existence of artifact can't realize automation, and repeatable accuracy is lower.For Digit Control Machine Tool and automatically processing device, what adopt usually is acquiescence tool setting point.Promptly, get one of them and carry out artificial tool setting, find the tool setting point same batch workpiece, later on all workpiece all with this tool setting point as datum mark.Because the wearing and tearing of the influence of form and position tolerance own and deviation in roundness or anchor clamps all can make actual tool setting point depart from this acquiescence tool setting point between the workpiece, so adopt acquiescence can't guarantee cutting precision to cutter mechanism.

" a kind of full-automatic balancing machine automatic positioning equipment " of Chinese patent ZL200720113068.9 proposed insulation board and separated cutter (together with the base of tool) and rotor, and utilizes both to contact the method that conduction is judged tool setting point.This method is simple and practical, but in actual applications, and the iron filings that cut can be attached on the insulation board and occur misleading, and need clear up iron filings termly, and this can interrupt the continuity of work and lower efficiency.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 to utilize bearing to rotate the formed oil film electric capacity in back, adopts the driving voltage of high frequency to measure changes in capacitance, and judges the tool setting point of cutter with this.Owing to adopt high-frequency excitation signal, introduced High-frequency Interference simultaneously, influenced the reliability of signal.In addition, when just bringing into use, bearing, after the break-in of using longer a period of time, just enters stable working condition because there is the phenomenon that misleads equally in the microcosmic out-of-flatness on surface.

Summary of the invention

The purpose of this utility model is not cut the dynamic oil film resistance of bearing that utilizes that iron filings disturb and is carried out the device of automatic tool preset for full-automatic rotor dynamic balancing machine provides in a kind of accurate positioning, simple in structure, the course of work.

The rotor dynamic balancing machine automatic tool preset device that utilizes dynamic oil film resistance of bearing of the present utility model, the travelling table that comprises machine, the cutting headstock, bearing, rotary main shaft, cutting tool, the anchor clamps of grip roll, base plate and DC power supply are installed, the positive pole of DC power supply links to each other by the positive pole of brush with rotary main shaft and signal acquisition circuit, the negative pole of DC power supply links to each other with the ground of anchor clamps and signal acquisition circuit, and signal acquisition circuit comprises the second order active low-pass filter of cascade, ultralow logical RC filter and three modules of comparator.

When this tool setting device utilizes the rotary main shaft rotation,, and utilize signal acquisition circuit to detect the variation of dynamic oil film resistance, determine final tool setting point by changes in resistance at the dynamic oil film resistance of bearing inner race and outer ring formation.

Compared with prior art, advantage of the present utility model is:

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

2) cancelled insulation board, the conducting of having avoided cutting iron to cut is disturbed;

3) adapt to full operating mode period, and can adapt to continuous automatic production, reduced the requirement that maintenance and machine are adjusted.

Description of drawings

Fig. 1 is the structural representation of the utility model device;

Fig. 2 is signal acquisition circuit figure;

Fig. 3 is each signal schematic representation.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing.

With reference to Fig. 1, the rotor dynamic balancing machine automatic tool preset device that utilizes dynamic oil film resistance of bearing of the present utility model, the travelling table 1 that comprises machine, cutting headstock 2, bearing 3, rotary main shaft 4, cutting tool 5, the anchor clamps 7 of grip roll 6, base plate 8 and DC power supply 11 are installed, and the positive pole of DC power supply 11 links to each other with the positive pole of rotary main shaft 4 with signal acquisition circuit 9 by brush 10, and the negative pole of DC power supply links to each other with the ground of anchor clamps 7 and signal acquisition circuit 9, signal acquisition circuit 9 comprises the second order active low-pass filter 12 of cascade, ultralow

logical RC filter

13 and 14 3 modules of comparator.

When rotary main shaft 4 rotations, according to the electric insulation character between part, but above-mentioned part separated into two parts: the resistance between the inner ring of bearing 3, rotary main shaft 4 and the cutting tool 5 is zero, is a part, is called parts one; The resistance of the outer ring of bearing 3 and anchor clamps 7 and installation base plate 8 is zero, is another part, is called parts two.The dynamic oil film that parts one and parts two form when being rotated by bearing 3 is separated, and the resistance between these two parts is exactly dynamic oil film resistance.When travelling table 1 drives cutting headstock 2, and then driven rotary main shaft 4 and cutting tool 5 move to when contacting with rotor 6, the resistance vanishing between two parts.Automatic tool preset device of the present utility model detects this variation by signal acquisition circuit: the rotary main shaft 4 in the parts one is guided to signal acquisition circuit 9 by brush 10 with the variable signal of the dynamic oil film resistance of two of parts one and parts, signal acquisition circuit 9 as shown in Figure 2, comprise 12, one ultralow logical RC filters 13 of a second order active low-pass filter and a comparator 14.Each signal waveforms is referring to Fig. 3 during work, and when cutting tool and rotor are critical when contacting, the primary signal of brush 10 outputs is the A among the figure; Tool setting primary signal A is by second order active low-pass filter 12, obtain signal B with the elimination High-frequency Interference, signal B is imported the average value signal C that ultralow logical RC filter 13 obtains signal B, signal C obtains reference signal D by electric resistance partial pressure, signal B and signal D input comparator 14 are obtained final tool setting signal E, the high-low level trip point P of signal E is the tool setting point, obtains tool setting point signal by follow-up single-chip microcomputer or PLC.Adopt this tool setting mode to remove the error signal that High-frequency Interference and bearing operating mode cause effectively, improved the reliability and the accuracy of tool setting signal greatly.

Claims

1. utilize the rotor dynamic balancing machine automatic tool preset device of dynamic oil film resistance of bearing, the travelling table (1) that comprises machine, cutting headstock (2), bearing (3), rotary main shaft (4), cutting tool (5), the anchor clamps (7) of grip roll (6), base plate (8) and DC power supply (11) are installed, the positive pole that it is characterized in that DC power supply (11) links to each other with the positive pole of rotary main shaft (4) with signal acquisition circuit (9) by brush (10), the negative pole of DC power supply links to each other with the ground of anchor clamps (7) and signal acquisition circuit (9), signal acquisition circuit (9) comprises the second order active low-pass filter (12) of cascade, (14) three modules of ultralow logical RC filter (13) and comparator.