A method of manufacturing disks from a strip of molybdenum

 

The invention relates to mechanical engineering and can be used in electro-production in the manufacture of parts from a strip of molybdenum. From strips cut disks, make the control of surface defects, after which the defects are removed by etching. Surface defects control the fingerprint rolls on samples. The above samples are obtained by making a trial batch of disks, identify drives this batch of print sizes of rolls to be removed by etching, and training on these dimensions of the control discs with fingerprints, having dimensions permissible for removal by etching. After control produces rejection disks with prints rolls with dimensions exceeding the limits. The result is the expansion of technological capabilities of the method. 1 Il., 3 table.

The invention relates to mechanical engineering and can be used in the electrical industry (PCI) in the manufacture of parts from a strip of molybdenum their subsequent etching for cleaning the surface from defects. Characterization of surface defects rental is provided, for example, Islenet neutogena". Regulated the number of defects of type: fingerprint rolls, bowls of Udalov, sponge marks, scratches.

In the manufacture of parts of PCI, for example, cutting disks, the technology provides for the control of surface defects, the number of them. But there is a requirement for the validity of the defects of the car on the surface of the disc - the possibility of their removal during subsequent etching.

Etching disks from molybdenum PM is performed in solution ingredients: hydrogen peroxide - 80 ml, ammonia 10 ml of distilled water to 10 ml, the etching time of 3-4 minutes at a solution temperature of 15-25oC. Before etching degreasing is performed after etching and rinsing in water, rinsing in sulfuric or hydrofluoric acid, rinsing in water.

With the existing technology drives part of their discarded after cutting surface defects, thereby reducing the yield, constitutes a waste of expensive, scarce metal.

We experimentally the possibility of the release of this technology prints rolls, this is the most common defect of the surface of the strips of molybdenum.

The closest analogue is taken a method of manufacturing a disk from the floor shall grad, Gosenergoizdat, 1961, S. 55-57, 62-63, 83-84.

Disadvantages closest analogue: not regulated print sizes surface used in the original strip, which may be grazed, leading to the rejection of part of the drive before etching.

The objective of the invention is to expand the technological capabilities of manufacturing CDs from bands with less rejection of their surface prints before etching.

The problem is solved by controlling surface defects disks prints on rolls of the samples, these samples are obtained by making a trial batch of disks, identify drives this batch of print sizes of rolls to be removed by etching, and training on these dimensions of the control discs with fingerprints, having dimensions permissible for removal by etching, and after the above-mentioned control produces rejection disks with prints rolls with dimensions exceeding the limits.

Common features with the closest analogue: made - cut discs are checked for prints, etched, rejected.

Distinguishing characteristics: disks with prints smaller than it has been experimentally found is, the).

A drawing. Prints rolls on the surface of the disc: a - mark long, x2; b - mark short and the point group, X10.

To implement the method execute operations: 1. In the development of technology of production of disks cut down an experimental batch of disks.

2. On the other surface of the disc record visually with the use of binocular stereoscopic microscope at magnification 6-12 prints using their classification: linear long, short linear, scatter, separate, point cluster (group) - drawing. Establish the dimensions of the bitmap prints: small - size from 0.1 mm to 0.2 mm, large - size from 0.21 mm to 0.5 mm

3. Perform etching drives installed technology.

4. The same inspection as before etching, determine the dissolution (etching) of prints with regard to their classification and size.

5. Prepare control samples with prints sizes, the maximum allowable for grazing.

6. Cut down production party drives with control prints on reference samples.

EXAMPLE. Produced disks from a strip of thickness 0.4 mm molybdenum brand Martyr supplied by THE 48-315-89. Recorded (sketched) prints, as well as. the Nova was examined and evaluated the effect of extinction (grazing) prints. The results are shown in tables 1-3.

It is established that the fine prints disappear when the etching, large (point and line) disappear partially. The etching performed in laboratory or industrial conditions, examination, laboratory, microscope MBS-2.

The technical result is to reduce rejection drives, increasing the yield of parts, reducing the consumption of expensive deficient molybdenum. The method implemented in PCI.

Claims

A method of manufacturing disks from a strip of molybdenum, including felling drives, control of surface defects and the subsequent destruction of the aforementioned surface defects by etching, characterized in that the control of surface defects disks prints on rolls of the samples, these samples are obtained by making a trial batch of disks, identify drives this batch of print sizes of rolls to be removed by etching, and training on these dimensions of the control discs with fingerprints, having dimensions permissible for removal by etching, and after the above-mentioned control

 

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SUBSTANCE: proposed machine has pneumatic cylinder rod provided with its motion limiter and contactless sensor at drifting mechanism on through slit of bottom end part of fuel element; cone angle of drift-rod is 30 deg. and annular drilling diameter in each hole of auxiliary spacer grid equals nominal flare of fuel element end part sections internally drifted inside each annular drilling within upper nominal-size tolerance D = Hk, where D is annular drilling diameter; H is nominal flare; k is upper nominal-size tolerance.

EFFECT: enhanced quality of fuel assembly.

1 cl, 5 dwg

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