SU856658A1

SU856658A1 - Method of producing magnetic disc substrate

Info

Publication number: SU856658A1
Application number: SU792800090A
Authority: SU
Inventors: Регимантас Пятрович Башкис
Original assignee: Специальное Конструкторское Бюро Вычислительных Машин
Priority date: 1979-06-08
Filing date: 1979-06-08
Publication date: 1981-08-23

Description

(54) СПОСОБ ИЗГОТОВЛЕНИЯ ОСНОВЫ МАГНИТНОГО ДИСКА(54) METHOD OF MANUFACTURING THE BASIS OF A MAGNETIC DISC

1one

Изобретение относитс к технологии обработки тонких пластин из алюминиевых сплавов, в частности к технологии изготовле.ни магнитных дисков дл запоминающих устройств вычислительных машин, и может быть приме-нено в промышленности, выпускающей вычислительную и видеозаписываюшую технику.The invention relates to the technology of processing thin plates from aluminum alloys, in particular to the technology of manufacturing magnetic disks for computer storage devices, and can be applied in the industry producing computing and video recording equipment.

Известны способы изготовлени магнитных дисков, согласно которым заготовка основы магнитного диска после ее предварительной механической обработки перед финишными операци ми подвергаетс термомеханической рихтовке при температурах, обеспечивающих по ньш отжиг, вследствие чего она приобр&тает необходимую геометрическую точность по плоскостности, определ емой посредством измерени торцового биени у нарзокного диаметра, и по воронкообразности - тарельчатости . После термомеханической рихтовки заготовка подвергаетс чистовому точению или доводке - полированию плоскостей. 11.Methods for manufacturing magnetic disks are known, according to which, after the preliminary machining of a magnetic disk, the blank of the base of the magnetic disk is subjected to a thermomechanical leveling at temperatures that ensure annealing before finishing operations, as a result of which it acquires the necessary geometric accuracy on flatness determined by measuring the end beats at narzoknogo diameter, and funnel-shaped - platelet. After thermomechanical leveling, the workpiece is subjected to clean turning or polishing - polishing of the planes. eleven.

Недостатком известных способов вл етс ухудшение макрогеометрии основы магнитного диска при ее чистовом алмазиом то . чении. Это ухудшение имеет особенно выраженный характер при изготовлении основы диска из алюминиевого сплава 1541, содержащего магний в качестве легирующего компонента .A disadvantage of the known methods is the deterioration of the macrogeometry of the base of a magnetic disk with its final diamond. . This deterioration is particularly pronounced in the manufacture of the basis of the disk of aluminum alloy 1541, containing magnesium as an alloying component.

Цель изобретени - повышение точности изготовлени основы магнитного диска.The purpose of the invention is to improve the manufacturing accuracy of the magnetic disk base.

Эта цель достигаетс , что согласно способу изготовлени основы магнитного диска из алюминиевого сплава, Joдepжaщeгo магний , включающему черновую механическую обработку, термомеханическую рихтозку и чистовое алмазное точение, перед чистовым алмазным точением заготовку подвергают химическому травлению.This goal is achieved that, according to the method of manufacturing the base of an aluminum alloy magnetic disk, a magnesium-containing alloy, which includes rough machining, thermomechanical straightening and finishing diamond turning, before finishing diamond turning, the workpiece is subjected to chemical etching.

Чернова механическа обработка сторон заготовки выполн етс известными способами и не представл ет каких-либо затруднений.The rough machining of the sides of the workpiece is carried out by known methods and presents no difficulty.

Claims

Thermomechanical straightening of a package of disks (or one disk) compressed between two plates is carried out at 400 ° C for an hour, depending on the number of blanks of disks subjected to thermomechanical straightening. The whites, in accordance with the known spasobob after thermomechanical leveling, carry out finishing diamond turning, the flatness of the product will be degraded in comparison with the state before finishing. . In order to prevent the deterioration of the macro-geometry parameters of the magnetic disk base, a chemical etching of the workpiece is provided before its final diamond turning. During chemical etching, the oxide film is removed, formed during thermomechanical straightening. Chemical etching can be carried out in solutions of sodium hydroxide or potassium, phosphoric and hydrochloric acids. When used for pickling 5-10% n (L-of sodium hydroxide solution, the duration of pickling is 8-11 minutes. The duration of pickling depends on the concentration of the solution, and there is no need to follow its timely termination, since overexposure of the workpiece in p iCTBOpe does not produce any noticeable negative effects. To obtain a uniform etching, the pre-pickling is subjected to degreasing using Vienna lime and water before the pickling. To remove the etching products, the disk blank is subjected to They are chemically screened using a solution of the following composition: nitric acid 200-400 g / l, phosphoric acid 50-100 g / l, ammonium, second 20-25 g / l. Both for chemical clarification and chemical etching can be used and other compositions of solutions. An earnest processing of the disk blank is performed by diamond turning using natural or synthetic cutters. Finishing each side of the disk is carried out in one or two passes. The depth of the passage may be in the range of 0.03-0.12 mm. The depth of cut is chosen depending on the depth of the damaged disc blank during thermomechanical leveling. The proposed method of manufacturing the base of a magnetic disk during diamond turning does not only preserve the macrogeometry of the magnetic disk, which oi had after thermomechanical straightening, but even its improvement. In addition, the removal of the oxide film has a positive effect on the durability of the tool for fine finishing. The invention The method of manufacturing the base of a magnetic disk made of aluminum alloy containing magnesium as an alloying component, including rough machining, thermomechanical straightening and diamond finishing, characterized in that, in order to improve manufacturing accuracy, before finishing turning, the workpiece is subjected to chemical etching. Sources of information taken into account during the examination 1. Yampolsky A. M, Metal etching. L., 1964, p. 86