Metal deforming – By application of fluent medium – or energy field – By kinetic energy of fluid or field
Patent
1983-09-30
1985-05-28
Gilden, Leon
Metal deforming
By application of fluent medium, or energy field
By kinetic energy of fluid or field
29421E, 72 62, B21D 2602
Patent
active
045192308
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to plastic metal working under the fluid pressure and is specifically concerned with apparatuses for sizing of tubes.
BACKGROUND ART
A problem existing in the mechanical engineering is associated with production of high-precision long-size tubes from difficult-to-form metals and alloys used in particular in manufacture of jackets for runover rolls of textile finishing machines and impression rollers of rotary printing machines. Very stringent requirements are imposed upon the accuracy of manufacture of such tubes, as an increase in the rotational speed of the rolls or rollers intended to step up the output of the machines may cause intensive oscillations and rupture of the moving material (textile fabric, paper tape). For example, in the jackets for runover rolls of textile finishing machines with the length of the roll amounting to 2200 mm, the runout must not exceed 0.4 mm.
Known in the prior art are apparatuses or production of such tubes, wherein a tube is sized in a die under the pressure of flulid.
There is known an apparatus for sizing of tubes intended for production of rollers for printing machines (cf. USSR Inventor's Certificate No.606,538 published in the journal "Discoveries, Inventions, Industrial Designs and Trademarks", 1978, No.17), comprising a die with a sizing channel in which a tube is installed. Inserated in the tube interior with the purpose of reducing the unbalance of these rollers is at least one additional tube which is shorter in length and whose outside diameter is equal to the inside diameter of the tube being sized. An elastic bag is introduced in the space of the tubes and the ends of the tube blank are hermetically sealed with stoppers. Deformation of the tubes is accomplished by pressure of the forwking medium delivered from a static pressure source into the elastic bag along a pipeline passing through one of the die end stoppers.
Due to a static character of the tube blank loading, such an apparatus cannot ensure a high level of accuracy in sizing of tubes.
Besides the apparatus is inconvenient in servicing.
The preparatory operations associated with installation of additional tubes in the main tube and also with introduction of the elastic bag in the interior of these tubes are substantially labour-and time-consuming.
Also known in the prior art is an apparatus for sizing of tubes under the pressure of fluid (cf. USSR Inventor's Certificate No.377,181 published in the journal "Discoveries, Inventions, Industrial Designs and Trademarks", 1973, No.18) in which a tube is sized portionwise. The apparatus comprises a split die mounted on a bed and provided with a horizontally arranged sizing channel corresponding to the shape of a tube, which accommodates a mandrel for setting the tube coaxially with the sizing channel, a means for delivery of fluid in the hermetically sealed clearance between the mandrel and the tube, and a means for building up the pressure of fluid in the clearance between the mandrel and the tube. The mandrel is provided with passages for delivery of the fluid into the clearance between the mandrel and the tube. At the ends the mandrel has circular grooves which are connected with the passages for delivery of the fluid and accommodate elastic packings which hermetically seal the clearance between the mandrel and the tube. The die is installed for a reciprocating movement along the guideways provided on the bed and arranged parallel to the mandrel. The halves of the die are opened and closed with the aid of hydraulic cylinders which also take up the pressure transmitted to the die in the process of sizing. The tube is moved for a successive sizing by means of a carriage provided with a centering device for one end of the tube being sized.
By means of the carriage the tube is pushed in the die set in one extreme position, then the die is closed and the tube complete with the carriage and the die is moved further along the guideways to the other extreme position of the die, thereby slipping the tube portion e
REFERENCES:
patent: 3487668 (1970-01-01), Fuchs
patent: 4049367 (1979-09-01), Tominaga
patent: 4210991 (1980-07-01), Cooper
Botyan Viktor V.
Chachin Viktor N.
Kolos Vladimir K.
Postnikov Viktor M.
Fiziko-Tekhnichesky Institut Akademii Nauk Belorusskoi SSR
Gilden Leon
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