CN102003937B - Punched sheet detection method and measurement seat thereof for detection - Google Patents

Abstract

The invention relates to the field of thin plate measurement, in particular to a detection method for stamped plates. The invention relates to a punching detection method, the main features of which include: 1) placing the punching sheet on a marble platform for compacting and compacting to ensure that the punching sheet has no warping deformation; 2) testing; and 3) processing the measurement data. The method of the invention is simple, accurate and reliable. Using the measurement scheme mentioned in the present invention, the development plan of the international cooperation project FAIR-superFRS superconducting dipole magnet between the Chinese Academy of Sciences and the German GSI (German National Laboratory for Heavy Ions) has been successfully completed. This ensures the smooth completion of the entire project as planned, and saves the cost of production and development. A new method for the measurement of large-size punches is proposed to provide experience for the production of such magnets in the future.

Description

Punching inspection method and measuring base for inspection

Technical field:

The invention relates to the field of thin plate measurement, in particular to a detection method for stamped plates.

Background technique:

At present, for electric motors or generators and punched-type magnets for scientific research, the shape and size of the punched pieces are the result of repeated calculations by large-scale finite element calculation software, and the calculated shape must be guaranteed during the manufacturing process of magnetic components and size. During manufacturing, after the punching of the first sheet is completed, a three-coordinate size inspection is usually carried out to check whether the pole head part of the magnetic element meets the design requirements, whether there are local defects or defects that affect the performance of the magnetic element. If a problem is found, the stamping die needs to be repaired, and then try punching again, and the punched sheet is re-tested, so that repeated testing and repairs can not start batch punching production until the test is qualified. In the production process, after punching a certain number of punches, it is necessary to sample and inspect the punches to see whether the stamping die is deformed or chipped during the production process, which affects the quality of the punches produced.

Punching inspection is a crucial production link for enterprises specializing in motor production. Enterprises can be equipped with professional three-coordinate measuring equipment according to the shape and characteristics of their products to monitor the production process. Using the traditional three-coordinate measuring instrument, due to the reason of the instrument, it is necessary to support the punching sheet to a certain height, and the large-scale punching sheet will naturally sag, which will bring relative measurement errors; the measurement method of the three-coordinate measuring instrument is a single contact type Point measurement, the measurement result is the position coordinates of each measurement point, for complex shape punches or punches with contour requirements, the measurement results cannot be reflected intuitively. Moreover, for scientific research units, there is often no such testing equipment, and they can only rely on outsourced manufacturers to ensure quality control through testing by companies with such testing equipment. However, the three-coordinate measuring equipment of the enterprise is usually equipped for the products of the enterprise, and the punches whose size and shape do not conform to the products of the enterprise cannot be inspected. If the entrusted testing equipment is in a different place, the process of transportation will also cause the deformation of the film, making the test results meaningless; at the same time, such repeated transportation and testing will also stop the production process and wait for the test results, which cannot be monitored constantly. , making the production cycle and cost increase dramatically.

Invention content:

The object of the present invention is to avoid the disadvantages of the prior art, and provide a punching inspection method and a measuring seat for inspection thereof. The present invention relies on the existing detection equipment, ingeniously designs the detection process, repeatedly calculates and checks the detection results, ensures that the detection data is true and reliable, and can reflect the detection accuracy of the film. The production time and expenses are saved, and the production task of magnetic components is successfully completed.

In order to achieve the above object, the technical solution adopted by the present invention is: a method for punching film detection, the main features of which include the following steps:

1) Place the punched piece on a marble platform and press it tightly to ensure that the punched piece has no warping deformation; it can reflect the true shape error of the punched piece.

2) Detection: Set the laser tracker measuring ball of the laser tracker on the measuring seat for detection, and set the measuring reference plane of the measuring seat on the side of the punch to be tested to ensure that the measuring seat and the side of the punch to be tested are The edge is in good contact; set the laser tracker at a suitable measurement position, so that the laser tracker measuring ball on each measurement point of the film to be tested can receive the laser emitted by the laser tracker; turn on the laser tracker to start measurement, Slowly move the measuring seat along the edge of the punch to be measured to ensure that the measuring ball and the measuring seat do not move relative to each other during the measurement process, so as not to affect the measurement accuracy. You can also use the processed magnet to suck the measuring ball and the measuring seat tightly.

3) Process the measurement data: Repeatedly measure the designated part of the punching chip, process the measurement data of this part, and obtain the standard deviation of the measurement; replace another punch, repeat the measurement steps, and obtain the standard deviation of the measurement.

A measuring seat for punching inspection, its main features include: the measuring seat is a hollow stepped cylindrical seat, the lower step is the measuring reference plane; the upper end surface is provided with a conical surface, and a laser tracker measuring ball is provided on the conical surface .

As for the measuring seat for punching inspection, the taper surface of the upper end surface is 45°.

In the measuring seat for punching sheet inspection, the upper step surface of the stepped cylindrical seat is a knurled surface.

Beneficial effects of the present invention: the present invention is simple, accurate and reliable. At the same time, it overcomes the measurement error caused by the bending deformation of the punch itself when the three-coordinate measuring machine is used for measurement. Using the measurement scheme of the present invention, the development plan of the international cooperation project FAIR-superFRS superconducting dipole magnet of the Chinese Academy of Sciences and the German GSI (German National Laboratory for Heavy Ions) is successfully completed. This ensures the smooth completion of the entire project as planned, and saves the cost of production and development. A new method for the measurement of large-size punches is proposed to provide experience for the production of such magnets in the future.

Description of drawings:

Fig. 1 is a schematic diagram of Embodiment 1 of the present invention.

Fig. 2 is a distribution diagram of measuring points of the punching sheet to be tested in Example 1 of the present invention.

Fig. 3 is a schematic structural diagram of Embodiment 2 of the present invention.

Fig. 4(a) is a measurement graph of the first measurement of the pole head segment in the present invention.

Fig. 4(b) is a measurement graph of the second measurement of the pole head segment in the present invention.

Fig. 4(c) is a measurement graph of the third measurement of the pole head segment in the present invention.

Fig. 4(d) is a measurement graph of the fourth measurement of the pole head segment in the present invention.

Detailed ways:

The principles and features of the present invention are described below, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

Embodiment 1: see Fig. 1, Fig. 2, a kind of punching detection method, its main feature comprises the following steps:

1) Place the punched piece on a marble platform and press it tightly to ensure that the punched piece has no warping deformation; it can reflect the true shape error of the punched piece.

2) Detection: Set the laser tracker measuring ball of the laser tracker on the measuring seat for detection, and set the measuring reference plane of the measuring seat on the side of the punch to be tested to ensure that the measuring seat and the side of the punch to be tested are The edge is in good contact; set the laser tracker at a suitable measurement position, so that the laser tracker measuring ball on each measurement point of the film to be tested can receive the laser emitted by the laser tracker; turn on the laser tracker to start measurement, Slowly move the measuring seat along the edge of the punch to be measured to ensure that the measuring ball and the measuring seat do not move relative to each other during the measurement process, so as not to affect the measurement accuracy. You can also use the processed magnet to suck the measuring ball and the measuring seat tightly.

3) Process the measurement data: Repeatedly measure the designated part of the punching chip, process the measurement data of this part, and obtain the standard deviation of the measurement; replace another punch, repeat the measurement steps, and obtain the standard deviation of the measurement.

Embodiment 2: see Fig. 3, a kind of measuring base for film detection, its main features include: the measuring base is a hollow stepped cylindrical seat, the lower step is the measuring reference plane; the upper end surface is provided with a conical surface, and the There is a laser tracker measuring ball on the surface. The tapered surface of the upper end surface is 45°. The upper step surface of the step cylindrical seat is a knurled surface, which is convenient for holding.

The punching sheet adopts the 0.5mm silicon steel sheet specified in the national standard. The silicon steel sheet can be selected according to the magnetic field requirements. The specific magnetic properties are provided by the manufacturer.

The equipment used for the measurements included:

1. Laser tracker; large-scale measuring equipment, often used for installation inspection of engineering equipment, deformation inspection of bridges and buildings, and size inspection of large parts.

2.00 grade marble platform; used to place punches on it to ensure that the punches are free from warping and other deformations, which will affect the measurement results.

3. For the punching measurement measuring seat, it is used to lead the side size and shape of the measuring punch to the measuring ball that can be measured by the laser tracker. That is to say, it is convenient to measure, and at the same time, it is sensitive to the microscopic defects on the side of the punching sheet, so as to ensure that the real error of the punching sheet is reflected on the measuring ball.

Using a laser tracker, see Figure 1 and Figure 2, press the punching piece 1 on the 00-grade marble 4 platform, use the measuring ball 3, repeatedly measure the designated part of the punching piece 1 pole, and measure the measurement data of this part processing to obtain the standard deviation of measurement; replace another punch and repeat the measurement steps to obtain the standard deviation of measurement; the repeatability of the obtained measurement reaches μ level, which is an order of magnitude higher than the manufacturing precision of the punch by 0.01 mm, fully satisfying measurement requirements.

By comparing the measurement data, see Figure 4(a), Figure 4(b), Figure 4(c), and Figure 4(d) The four measurement results all reflect the microscopic defect of the local concave of the pole head, and the size of the defect is 0.06mm, and the standard deviation of measurement is ±0.01mm. The following is the error analysis of this measurement scheme.

Measurement uncertainty components include:

i) The measurement uncertainty of the laser tracker instrument is 0.01mm. (determined by the instrument manual)

ii) The uncertainty caused by personnel operation in the measurement process is 0.01mm. (After repeatedly measuring a single point several times, calculate its standard deviation)

i), ii) The two measurement uncertainties are irrelevant, so the overall measurement uncertainty is:

${\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>\sqrt{\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="N\; u\; i"\; filenames="HSA00000274891200011.png"\; state="\{\{state\}\}">N</figure-callout></span><figure-callout\; id="2"\; label="N\; u\; i"\; filenames="HSA00000274891200011.png"\; state="\{\{state\}\}">\; </figure-callout>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{{\mathrm{<span\; class="notranslate">\; u</span>}}_{}}^{}{{\mathrm{<span\; class="notranslate">\; i</span>}}_{}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}\underset{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&le;</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; j</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; ij</span>}}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.014</span>}\mathrm{<span\; class="notranslate">\; mm</span>}$

This measurement method is complete for the punching measurement where the dimensional tolerance and line tolerance are required to be >0.05mm. The measurement requirements are met, and the measurement results are indeed credible.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (1)

1. punching detection method, its characteristic comprises the steps:

1) punching is placed on sturdy compressing on the marble platform, guarantees that punching do not have buckling deformation;

2) detect: measure ball to the laser tracker of laser tracker and be arranged on the measuring seat; The measuring basis face of measuring seat is arranged at a measurement point of punching to be measured; Laser tracker is arranged on fixing position; Make laser tracker on each measurement point of punching to be measured measure ball and all can receive the laser that laser tracker sends, measure punching side dimension and shape and be drawn out on the laser tracker, guarantee the punching true error is reflected to the measurement ball;

3) measurement data is handled: punching cartridge specified portions is measured repeatedly, this part measurement data is handled, draw the standard deviation of measurement; Change another piece punching, the duplicate measurements step draws the standard deviation of measurement.

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