CN1069803A - Testing instrument for circular movement locus of numerically controlled machine tool - Google Patents

Abstract

A kind of testing instrument for circular movement locus of numerically controlled machine tool, by surveying the scalable pair of ball test component that ball, attachment screw, assembly type parallel spring mechanism, extension rod are formed, sensor and can be every the magnetic support part composition of magnetic.When the distance of main-shaft axis being made circle orbiting motion, radius of circle when the worktable of measurand has error, survey the gauge head that ball promotes the attachment screw compression sensor, obtain control information, by processing to control information, the diagnosable error source that goes out measurand.Because simple in structure, the debugging of this tester easily, cost is low, precision is high, can be used to have the test of digital control system device circular movement locus as numerically-controlled machine, three coordinate measuring machine etc.

Description

Testing instrument for circular movement locus of numerically controlled machine tool

The present invention relates to mechanical means is the metering outfit of feature, especially a kind of tester of circular movement locus.

Numerically-controlled machine, three-coordinate measuring machine etc. have application more and more widely in the modern mechanical process industry, it is also just more and more urgent how research detects the problem of their circular movement locus.At present, traditional external testing instrument for circular movement locus of numerically controlled machine tool, its structure are connected to two magnetic bearings 5 respectively on the main shaft and worktable of required detection lathe (or measuring machine) as shown in Figure 1, then two survey balls on the instrument are put respectively in the bellmouth of two magnetic bearings, this moment, a centre of sphere coordinate A who surveys ball 1 was defined as (0,0,0), another survey ball 1 ' centre of sphere coordinate B be (x, y, z), the distance of two centre of sphere points then $\mathrm{R=}\sqrt{x{}^2\mathrm{+<figure-callout\; id="2"\; label="y"\; filenames="911085807\_DRIMG1.png"\; state="\{\{state\}\}">y</figure-callout>}{}^2\mathrm{+<figure-callout\; id="2"\; label="z"\; filenames="911085807\_DRIMG1.png"\; state="\{\{state\}\}">z</figure-callout>}{}^2}$ ; Make the B point make a circle orbiting motion by digital control system around the A point.Because there is error in practical set-up, then the B actual coordinate of ordering is (x+ △ x, y+ △ y, z+ △ z), because (x, y z) have deviation, and then actual range and theoretical is poor to theoretical coordinate $\mathrm{\Delta R=}\sqrt{\mathrm{(x+\Delta x)}{}^2\mathrm{+(y+\Delta y)}{}^2\mathrm{+(z+\Delta z)}{}^2}-\sqrt{x{}^2\mathrm{+<figure-callout\; id="2"\; label="y"\; filenames="911085807\_DRIMG1.png"\; state="\{\{state\}\}">y</figure-callout>}{}^2\mathrm{+<figure-callout\; id="2"\; label="z"\; filenames="911085807\_DRIMG1.png"\; state="\{\{state\}\}">z</figure-callout>}{}^2}$ 。Sensor 2 on the tester is to be used for receiving △ R signal, by information processing to △ R, and the diagnosable error source that goes out measurand.By the analysis to this tester, there is following problems in it:

1. as shown in Figure 1,3 its effects of monoblock type elastic displacement mechanism are the information of obtaining displacement △ R, can eliminate simultaneously the influence to axial displacement of the moment reversed.Therefore require to have little axial rigidity and big torsional rigidity, and require the wall thickness dimension at elastic component C, D, E, F place thin, require fully symmetry, and each interior round surface quality unanimity, so cause the difficulty of manufacturing with consistent; Simultaneously, owing to adopt monolithic construction, whole elastic component must be selected elastomeric alloy steel for use, has increased manufacturing cost.

2. as shown in Figure 2, magnetic bearing 5 adopts the monoblock type magnet structure, and it is made up of permanent magnet 8, gathering magnet 7, base 6, does not have every magnetic or degaussing gear.When if proving installation is installed, because the effect of magnetic force can cause and survey ball and the collision of magnetic bearing, ball surface quality is surveyed in influence, so that influences measuring accuracy; During dismounting,, must just can make its separation with bigger power because magnetic force is tightly inhaled the survey ball.

3. as shown in Figure 1, the gauge head of sensor 2 inserts and contact with its inner face in attachment screw 4 holes and be connected, and owing to it contacts with gauge head, needs the inner face in Precision Machining hole, so increased difficulty of processing and cost again.

The object of the invention provides a kind of employing assembly type parallel spring mechanism, and band overcomes the existing problem of above-mentioned traditional tester every the magnetic bearing of magnetic mechanism and the connected mode that adopts transducer probe assembly to contact with the attachment screw outer face thereby reach.

The technical solution used in the present invention is: it comprises by surveying scalable pair of ball test component, sensor and the magnetic support part that ball, attachment screw, elastic displacement mechanism and extension rod are formed.Elastic displacement mechanism in the scalable pair of ball test component adopts assembly type parallel spring mechanism, and it comprises "T"-shaped plate, sheet metal, each hangs the reed that is clamped by two clamping plate, the sounding rod that the copper sheathing on the clamping plate is used for guiding attachment screw, sensor respectively in its both sides.The hole that the gauge head of sensor passes "T"-shaped plate is connected with the outer face contact of attachment screw, and limit journey pin inserts in the "T"-shaped plate base apertures.The magnetic support part adopts can be every the magnetic bearing of magnetic.

The present invention compared with prior art its advantage is:

In the scalable pair of ball test component, change assembly type parallel spring mechanism into by monoblock type elastic displacement mechanism; Monoblock type permanent magnet magnetic bearing changes into can be every the magnetic bearing of magnetic; The contact of transducer probe assembly and attachment screw outer face is connected etc., makes this tester rational in infrastructure, and it is easy, easy to use to make debugging, and is with low cost and measuring accuracy is high.Therefore, this tester can be used to measure the circular movement locus that numerically-controlled machine, three-coordinate measuring machine etc. have the digital control system device effectively, handles the Error Diagnostics source by error signal.

The invention will be further described below in conjunction with accompanying drawing.

Fig. 1, traditional testing instrument for circular movement locus of numerically controlled machine tool structure diagram;

Fig. 2, monoblock type permanent magnet magnetic seat structure synoptic diagram;

Fig. 3, testing instrument for circular movement locus of numerically controlled machine tool structure diagram of the present invention;

Fig. 4, assembly type parallel spring mechanism structure figure;

Fig. 5, can be every the magnetic seat structure figure of magnetic;

Fig. 6, can be every the magnetic bearing assembly process figure of magnetic.

As shown in Figure 3, Figure 4, the assembly type parallel spring mechanism 11 in the scalable pair of ball test component is made up of clamping plate 16, "T"-shaped plate 17, rivet 18, beryllium-bronze reed 15, copper sheathing 20, sheet metal 14."T"-shaped plate 17 and sheet metal 14 play the rigid support effect; Reed 15 works the displacement effect that detects, it controls and limits the size of stretch section by the size of the clamping plate 16 of side, with equally distributed screw 19 reed 15 and clamping plate 16 are become one, have very little sense of displacement rigidity and big torsional rigidity thereby reach parallel spring mechanism.Copper sheathing 20 on clamping plate 16, its effect are the sounding rods of guiding attachment screw 12, sensor 10.Limit journey pin 13 inserts in "T"-shaped plate 17 base apertures.

As Fig. 5, shown in Figure 6, can be every magnetic support part 9 its assembling processes of magnetic: earlier with permanent magnet thin slice 23 and in magnet 26 is packed magnetic base 29 into, to be contained on the magnetic base 29 with rivet 21(every magnetic thin plate 24, cover plate 22 then and adopt NULL) fuse 22,24,29, again cover plate 28 is screwed in the hole of magnetic base 29 sides; Handle 27 is contained in the rotating shaft of magnet travel mechanism 25, packs into and every magnet 26 contacted springs 30, be screwed into spring pedestal 31 again and make spring 30 fixing in magnetic base 29 bottom surfaces.When tester was worked, the magnetic bearing was in and externally shows magnetic state, and the parts that the effect of spring 30 this moment makes permanent magnet thin slice 23, form every magnet 26 move up, on the lastblock magnetic patch is on magnetic thin plate 24 when moving.During the instrument installation or removal, utilize travel mechanism's (cam mechanism or slide block mechanism or shifting fork mechanism etc.) that 23,26 parts of forming are moved down, the lastblock magnetic patch is under magnetic thin plate 24, to reach closed in the magnetic circuit, externally do not show the purpose of magnetic, thereby the survey ball is unloaded at the enterprising luggage of magnetic bearing easily.

The whole tester course of work is: when the relative main-shaft axis of worktable of measurand was made the circle orbiting motion, the radius of circle distance had error △ R, then surveys the gauge head that ball 1 promotes attachment screw 12 compression sensors 10, thereby obtained △ R information; Make parallel spring mechanism 11 produce translation simultaneously; Because the torsional rigidity of reed mechanism is very big, so the additional torque in the test process does not have influence to axial displacement.

Claims (2)

1, a kind of testing instrument for circular movement locus of numerically controlled machine tool, comprise by surveying ball, attachment screw, the scalable pair of ball test component that elastic displacement mechanism and extension rod are formed, sensor and magnetic support part, feature of the present invention is to be: the elastic displacement mechanism in the scalable pair of ball test component adopts assembly type parallel spring mechanism [11], it comprises "T"-shaped plate [17], sheet metal [14], each hangs the reed [15] that is clamped by two clamping plate [16] in its two sides, copper sheathing [20] on the clamping plate [16] is used for guiding attachment screw [12] respectively, the sounding rod of sensor [10], the hole that the gauge head of sensor [10] passes "T"-shaped plate [17] contacts with the outer face of attachment screw [12], and limit journey pin [13] inserts in "T"-shaped plate [17] base apertures.

2, tester according to claim 1, it is characterized in that: magnetic support part (9) adopts can be every the magnetic bearing of magnetic, it comprises every magnet (26), permanent magnet thin slice (23), every magnetic thin plate (24), cover plate (22) and magnetic base (29), magnet travel mechanism (25) packs into from the side in the groove of magnet (26), is to be bearing on magnetic base (29) bottom surface by contacted spring (30) with it every magnet (26).

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