CN205066723U - Combined positioning device - Google Patents

Abstract

The utility model provides a combined positioning device and a positioning method. The combined positioning device includes a base plate and a supporting part; a first guide rail is arranged on the base plate, the first guide rail is parallel to the base plate, and a first slider and a second guide rail are arranged on the first guide rail. Two sliders, the first slider and the second slider are respectively provided with a first pointer dial gauge and a second pointer dial gauge; the support part includes a horizontal section and a vertical section, and the horizontal section is fixedly connected to the bottom plate , the vertical section is perpendicular to the bottom plate; the horizontal section is provided with a positioning hole, which is used to install the probe holder of the probe assembly; the vertical section is provided with a second guide rail, the second guide rail is perpendicular to the first guide rail, and the second guide rail is on the A third slider is provided; a positioning head is provided on the third slider, the positioning head is parallel to the lateral part, and the positioning head is used for positioning at the center of the positioning groove of the magnetic suction cup of the probe assembly. The utility model has the advantages of simple structure, quick positioning, reduced artificial measurement errors, and further improves the measurement efficiency and application range of the three-coordinate measuring machine.

Description

A combined positioning device

technical field

The utility model relates to the technical field of precision testing, in particular to a combined positioning device and a positioning method.

Background technique

With the rapid development of mechatronics technology and computer technology, three-coordinate measuring machines have gradually approached the production site, especially in the working environment of precision manufacturing and mass inspection, and are widely used in precision machinery, electronics, instruments and other fields. The three-coordinate measuring machine is one of the most effective methods for measuring and obtaining dimensional data. It can replace a variety of measuring tools, with high measurement accuracy and good repeatability.

The probe base assembly 5 of the three-coordinate measuring machine, as shown in Figure 2, includes a probe base 5-4, a connecting rod 5-3, a probe 5-8, a magnetic chuck 5-1, a magnetic chuck base 5-2, and a connecting rod The lower end of the magnetic chuck is connected with the probe seat, and the upper end is connected with the base of the magnetic chuck. The magnetic chuck is connected to the base of the magnetic chuck through positioning screws 5-6. The side wall of the magnetic chuck is provided with positioning grooves 5-5. By loosening the positioning screws, it can be Rotate the magnetic chuck, turn the positioning groove to the expected position, and then tighten the screws to fix the magnetic chuck; there are four threaded holes on the probe base, and the four threaded holes are used to install the probe. The four threaded holes are located on the same plane. The threaded holes of two threaded holes are opposite to each other. The connection line of two threaded holes is the X-axis of the probe base, and the connection line of the other two threaded holes is the Y-axis of the probe base. The X-axis of the probe base and the probe base The Y-axis is vertical, the X-axis or Y-axis of the probe base is the probe base axis 5-10, the positioning groove on the magnetic chuck is arc-shaped, assuming that there is a straight line L passing through the center of the positioning slot, this straight line L is called The axis of the positioning slot is 5-9, and the positioning slot is symmetrical along the axis of the positioning slot. When positioning the probe assembly, look down from the top of the magnetic chuck. If the X axis of the probe base is used as a reference, the X axis of the probe base can be judged. If the X-axis of the probe seat coincides with the axis of the positioning groove, the X-axis of the probe seat is 5-10 of the axis of the probe seat; if the Y-axis of the probe seat is used as a reference to judge whether the Y-axis of the probe seat coincides with the axis of the positioning groove, The Y axis of the probe holder is the probe holder axis 5-10.

However, in three-coordinate measurement, we generally take the surface of the workbench as the reference plane. When using a three-coordinate measuring machine to measure shape and position errors such as roundness and coaxiality, the section curve to be obtained must be consistent with the cylindrical surface or conical surface. The section perpendicular to the central axis of the measuring head requires that the central axis of the cylindrical or conical surface must be parallel to the central axis of the probe during measurement. If the workpiece to be measured is placed directly on the workbench, the extracted elements may be distorted because the measurement positioning end face is not perpendicular to the central axis, as shown in Figure 1.

We are using ZEISSCONTURAG2 three-dimensional coordinate measuring machine now. Since the probe base and the extension connecting rod are connected by threads, when installing the star probe assembly, the existing method is to look down from the top of the magnetic chuck and visually inspect it. Whether the axis of the needle seat coincides with the axis of the positioning groove, this method is easy to cause misjudgment, so that the axis of the probe seat is not parallel to the X-axis or Y-axis of the three-coordinate measuring machine, resulting in distortion of the extracted elements and measurement errors, as shown in Figure 3, Figure 4 shows. It can be seen that when using three-coordinates to measure roundness and coaxiality errors, if the workpiece and probe are installed unreasonably, other geometric errors will be introduced into the measurement process, making the measurement accuracy worse.

Utility model content

The purpose of the utility model is to provide a combination positioning device and positioning method with simple structure and convenient operation, which can align and position the probe assembly used in the three-coordinate measuring machine and the workpiece to be measured.

The utility model provides the following technical solutions:

A combination positioning device, its special features are:

Including base plate and support part;

A first guide rail is arranged on the base plate, the first guide rail is parallel to the base plate, a first slide block and a second slide block are arranged on the first guide rail, and both the first slide block and the second slide block can move along the axis of the first guide rail. to slide, the first slider and the second slider are respectively provided with the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6, the first pointer dial gauge 1-5 and the second pointer dial gauge The heads of the two-pointer dial indicators 1-6 are all used to contact the datum surface of the workpiece to be measured;

The support part includes a transverse section and a vertical section, the transverse section is fixedly connected to the bottom plate, and the vertical section is perpendicular to the bottom plate;

The transverse section is provided with a positioning hole, and the positioning hole is used to install the probe base of the probe assembly. When the probe base is installed in the positioning hole, the connecting rod of the probe assembly is perpendicular to the bottom plate, and the positioning head is connected to the X-axis of the probe base. or the Y axis is vertical;

The vertical section is provided with a second guide rail, the second guide rail is perpendicular to the first guide rail, the second guide rail is provided with a third slide block, and the third slide block can slide axially along the second guide rail;

The third sliding block is provided with a positioning head, which is parallel to the transverse part, and the positioning head is used for positioning at the center of the positioning groove of the magnetic sucker of the probe assembly.

The above-mentioned combined positioning device also includes a positioning rod, and the positioning hole is in the shape of a rectangle or a "ten";

If the positioning hole is rectangular, the positioning hole is compatible with the probe base of the three-coordinate measuring machine; or there are two positioning rods, and these two positioning rods are respectively used to connect to two opposite threaded holes on the probe base superior;

If the positioning hole is in the shape of a "ten", there are four positioning rods, and these four positioning rods are respectively used to be connected to the four threaded holes on the probe base.

The support part and the bottom plate are screwed together.

The above-mentioned supporting part is in an inverted "T" shape.

The above combined positioning device also includes a support platform, and the bottom plate is screwed to the support platform.

Above-mentioned supporting platform is marble platform.

The quantity of the above-mentioned first guide rail and the second guide rail is one or two.

The above-mentioned second guide rail is threadedly connected with the vertical section.

The utility model has the following technical effects:

The utility model can greatly shorten the installation, adjustment and alignment time of the widely used three-coordinate measuring machine star-shaped probe assembly in practical applications, and reduce the installation deviation of the three-coordinate measuring machine due to the installation deviation of the probe assembly and the relative position deviation of the measured workpiece. The artificial measurement error introduced further improves the measurement accuracy of the three-coordinate measuring machine, especially plays a vital role in the measurement of the roundness of the deep hole of the large workpiece step and the coaxiality of the short hole and the long distance, effectively ensuring the precision Manufacturing and batch inspection to measure the measurement accuracy of roundness and cylindricity errors.

Description of drawings

Fig. 1 is a measurement schematic diagram under the condition that the existing three-coordinate measuring machine is misaligned.

Fig. 2 is an installation perspective view of a conventional three-coordinate measuring machine probe assembly.

Fig. 3 is an alignment diagram of the installation axis of the probe assembly of the existing three-dimensional coordinate measuring machine (that is, looking down from directly above the magnetic chuck, the axis of the positioning groove coincides with the axis of the probe seat).

Fig. 4 is a misalignment diagram of the installation axis of the probe of the existing three-dimensional coordinate measuring machine (that is, looking down from directly above the magnetic chuck, the axis of the positioning groove and the axis of the probe seat do not coincide).

Fig. 5 is a front partial sectional view of the positioning device of the present invention.

Fig. 6 is a top view of the positioning device of the present invention.

Fig. 7 is a left view of the positioning device of the present invention.

Fig. 8 is a partially enlarged view of part A in Fig. 5 .

FIG. 9 is a partially enlarged view of part B in FIG. 5 .

Fig. 10 is a partially enlarged view of part C in Fig. 6 .

In the figure, 1-1 is the bottom plate, 1-2 is the first guide rail, 1-3 is the first slider, 1-4 is the second slider, 1-5 is the first pointer dial indicator, 1-6 is the The second pointer dial indicator, 1-7 is the fixing screw of the first guide rail, 2-1 is the vertical section, 2-2 is the second guide rail, 2-3 is the third slider, 2-4 is the positioning head, 2-5 is the fixing screw of the second guide rail, 2-6 is the fixing screw of the supporting part, 2-7 is the long screw, 2-8 is the positioning hole, 3 is the supporting platform, 3-1 is the fixing screw of the bottom plate and the supporting platform, 3-2 is the fixed threaded hole, 4 is the workpiece to be measured, 5 is the probe assembly of the CMM, 5-1 is the magnetic chuck, 5-2 is the base of the magnetic chuck, 5-3 is the connecting rod, 5-4 5-5 is the positioning groove, 5-6 is the positioning screw, 5-7 is the connecting threaded hole, 5-8 is the probe, 5-9 is the axis of the positioning groove, 5-10 is the axis of the probe seat .

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Referring to Fig. 5 to Fig. 10, the utility model provides a combined positioning device, which includes a bottom plate 1-1 and a supporting part; a first guide rail 1-2 is arranged on the bottom plate, the first guide rail is parallel to the bottom plate, and the first guide rail is provided with The first slider 1-3 and the second slider 1-4, the first slider and the second slider can slide along the axial direction of the first guide rail, the first slider and the second slider are respectively provided with the first One pointer type dial gauge 1-5 and the second pointer type dial gauge 1-6, the heads of the first pointer type dial gauge 1-5 and the second pointer type dial gauge 1-6 are all used to communicate with the The reference surface contact of the measured workpiece; move the first horizontal slider 1-3 horizontally and the second horizontal slider 1-4 according to the reference length of the measured workpiece 4, and then make the first pointer dial gauge 1-5, the second horizontal slider Pointer dial indicators 1-6 heads are in contact with the measured workpiece 4 reference plane.

The supporting part includes a transverse section and a vertical section 2-1, the transverse section is fixedly connected to the bottom plate, and the vertical section is perpendicular to the bottom plate;

The horizontal section is provided with positioning holes 2-8. The positioning holes are used to install the probe base of the probe assembly. When the probe base is installed in the positioning hole, the connecting rod of the probe assembly is perpendicular to the bottom plate, and the positioning head is X Axis or Y axis vertical;

The vertical section is provided with a second guide rail 2-2, the second guide rail is perpendicular to the first guide rail, the second guide rail is provided with a third slide block 2-3, and the third slide block can slide along the axial direction of the second guide rail;

The third slider is provided with a positioning head 2-4, the positioning head is parallel to the transverse part, and the positioning head is used to limit the position at the center of the positioning groove of the magnetic sucker of the probe assembly.

The combined positioning device also includes a positioning rod, and the positioning hole is in the shape of a rectangle or a "ten";

If the positioning hole is rectangular, the positioning hole is compatible with the probe base of the three-coordinate measuring machine; or there are two positioning rods, and these two positioning rods are respectively used to connect to two opposite threaded holes on the probe base superior;

If the positioning hole is in the shape of a "ten", there are four positioning rods, and these four positioning rods are respectively used to be connected to the four threaded holes on the probe base.

The support part and the bottom plate are screwed together. The support part is in the shape of an inverted "T", and the combined positioning device also includes a support platform 3, the bottom plate and the support platform can be connected by screws, the support platform is a marble platform, the number of the first guide rail and the second guide rail is one or two, the The two guide rails and the vertical section can be threadedly connected by screws.

The positioning method using the combined positioning device of the present invention:

1) Place the combined positioning device in the measurement area of the three-coordinate measuring machine, and place the standard gauge block on the support platform. The standard gauge block includes two relative reference planes, namely the first reference plane and the second reference plane, so that The probe of the Z-axis on the three-coordinate measuring machine is in contact with the first datum plane;

2) Along the length direction of the first guide rail, use a three-coordinate measuring machine to select at least two measurement points from one end of the first reference plane to the other end for measurement. The Y-axis coordinate of the machine;

If these values are equal, go to step 3);

Otherwise, slightly twist the standard gauge block and repeat step 2);

3) Fix the standard gauge block;

The second reference surface of the standard gauge block is in contact with the heads of the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6;

If the dial readings of the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6 are equal, set the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6 The dial readings are all set to zero, that is, the zeroing of the combined positioning device is completed. At this time, the first guide rail is parallel to the X-axis of the three-coordinate measuring machine, and the second guide rail is parallel to the Z-axis of the three-coordinate measuring machine;

If the dial readings of the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6 are not equal, slightly twist the combined positioning device to make the first pointer dial gauge 1-5 and the second pointer dial gauge 1-5 The dial readings of the two pointer dial indicators 1-6 are equal, and the dial readings of the first pointer dial indicators 1-5 and the second pointer dial indicators 1-6 are all set to zero, that is, the combination positioning device is completed. Zero adjustment, at this time, the first guide rail is parallel to the X-axis of the three-coordinate measuring machine, and the second guide rail is parallel to the Z-axis of the three-coordinate measuring machine;

4) Remove the standard gauge block;

5) Put the probe seat of the probe assembly into the positioning hole 2-8, the precision fit gap between the probe seat and the positioning hole is 0.01mm; then move the third slider;

If the positioning head can be limited to the center of the positioning groove of the magnetic chuck of the probe assembly, at this time, the positioning head is perpendicular to the X-axis or Y-axis of the probe seat, and the positioning of the probe assembly is completed; When looking down from directly above the suction cup, the axis of the positioning groove coincides with the axis of the probe holder, that is to say: if the positioning head can be limited to the center of the positioning groove of the magnetic suction cup of the probe assembly, the positioning head is perpendicular to the X axis of the probe holder, Then the axis of the positioning groove is perpendicular to the X-axis of the probe seat;

If the positioning head cannot be limited at the center of the positioning groove of the magnetic chuck of the probe assembly, then loosen the positioning screw 5-6 on the magnetic chuck 5-1, and rotate the magnetic chuck 5-1 so that the positioning head can be limited to the probe assembly At the center of the positioning groove of the magnetic chuck, at this time, the positioning head is perpendicular to the X-axis or Y-axis of the probe seat, and then tighten the positioning screws 5-6 to limit the positioning head to the center of the positioning groove of the magnetic chuck of the probe assembly. Then complete the positioning work of the probe assembly; at this time, when looking down from the top of the magnetic chuck, the axis of the positioning groove coincides with the axis of the probe holder; At the center, the positioning head is perpendicular to the X-axis of the probe base, and the axis of the positioning groove is perpendicular to the X-axis of the probe base;

Wherein, the precise fit gap between the positioning head 2-4 and the positioning groove 5-5 on the magnetic sucker 5-1 can be 0.01mm;

6) Place the measured workpiece 4 on the support platform 3, and the reference plane of the measured workpiece 4 is in contact with the heads of the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6,

If the dial readings of the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6 are equal, that is, the measured workpiece 4 has been positioned correctly, and then the measured workpiece 4 is kept still, and the three-coordinate measurement is used. Measuring the related shape and position tolerance and size of the workpiece 4 by machine;

If the dial readings of the first pointer dial gauge 1-5 and the second pointer dial gauge 1-6 are not equal, slightly twist the combined positioning device to make the first pointer dial gauge 1-5 and the second pointer dial gauge 1-5 The dial readings of the two-pointer dial gauges 1-6 are equal, that is, the workpiece 4 to be measured has been identified and positioned, and then the workpiece 4 to be measured is kept still, and the relevant shape tolerance and size of the workpiece 4 to be measured are measured by a three-coordinate measuring machine. ;

Wherein, the order of step 5) and step 6) can be interchanged, and can also be performed at the same time.

The above content is a further detailed description of the utility model in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiment of the utility model is limited to this. Under the premise of the new concept, some simple deduction or replacement can also be made, which should be regarded as belonging to the utility model and the patent protection scope is determined by the submitted claims.

Claims (8)

1. an integrated positioning device, is characterized in that:

Comprise base plate and support portion;

Described base plate is provided with the first guide rail, first guide rail is parallel with base plate, first guide rail is provided with the first slide block and the second slide block, first slide block and the second slide block all can sliding axially along the first guide rail, first slide block and the second slide block are respectively arranged with the first pointer clock gauge (1-5) and the second pointer clock gauge (1-6), and the gauge outfit of the first pointer clock gauge (1-5) and the second pointer clock gauge (1-6) is all for contacting with the reference field of measured workpiece;

Described support portion, comprise traversing section and vertical section, traversing section and base plate are connected, and vertical section is vertical with base plate;

Described traversing section is provided with pilot hole, and pilot hole is for installing the probe base of probe assembly, and when probe base is arranged on pilot hole, the connecting link of probe assembly is vertical with base plate, and X-axis or the Y-axis of positioning head and probe base are vertical;

Described vertical section is provided with the second guide rail, and the second guide rail is vertical with the first guide rail, the second guide rail is provided with the 3rd slide block, and the 3rd slide block can sliding axially along the second guide rail;

3rd slide block is provided with positioning head, and positioning head is parallel with transverse part, and positioning head is used for the spacing center at probe assembly magnetic chuck locating slot.

2. integrated positioning device according to claim 1, is characterized in that: described integrated positioning device also comprises backstay, rectangular or " ten " font of pilot hole;

If pilot hole is rectangular, the probe base of pilot hole and three coordinate measuring machine is suitable; Or described backstay has two, these two backstays are respectively used to be connected on two threaded holes relative on probe base;

If pilot hole is in " ten " font, described backstay has four, and these four backstays are respectively used to be connected on four threaded holes on probe base.

3. integrated positioning device according to claim 2, is characterized in that: be threaded between support portion with base plate.

4. integrated positioning device according to claim 3, is characterized in that: described support portion is inverse-T-shaped.

5. integrated positioning device according to claim 4, is characterized in that: described integrated positioning device also comprises support platform, and described base plate is threaded with support platform.

6. integrated positioning device according to claim 5, is characterized in that: described support platform is marble platform.

7., according to the arbitrary described integrated positioning device of claim 1 to 6, it is characterized in that: the quantity of described first guide rail and the second guide rail is one or two.

8. integrated positioning device according to claim 7, is characterized in that: be threaded between described second guide rail with vertical section.