Device for rotary extrusion of thin-walled cylindrical articles


(57) Abstract:

Use: treatment of metals by pressure. The inventive device includes a mandrel mounted in the spindle, and a work tool in the form of a ballpoint raskatnoe head installed at an angle to the axis of rotation. The angle at which the ball raskatnoe head is determined by the dependences. The mandrel one end pivotally connected with the spindle by means of a ball and an elastic element using a bellows or spring. 3 C.p. f-crystals, 1 Il.

The invention relates to the processing of metals by pressure and can be used for the manufacture of thin-walled cylindrical shells with high precision.

A device for transverse rolling of tubes, selected as a prototype containing the mandrel with dressed her a tubular workpiece, one end of which is rigidly mounted in the machine spindle and its other end tightened emphasis Poppet and ball raskatnoe head, mounted perpendicular to the axis of rotation of the mandrel.

The disadvantages of the known device lies in the fact that it does not provide the discreteness of the deformation process (testing) of the workpiece material, and therefore not espressomachines manufacturing process and product quality.

In addition, to obtain high-precision thin-walled cylindrical products requires the use of high-precision equipment, high precision settings applicable device, as the slightest deviation from alignment of at least one of the components (spindle, the axis of rotation of the mandrel, the center clip Ares and center the tailstock of the machine, causes cyclic bending mandrel, the variability of deformable products balls along the length of the workpiece and, consequently, a deterioration in the accuracy of the shape and dimensions of the manufactured products.

The technical result of the present invention is to improve the productivity and quality of products.

The drawing shows a diagram of the device.

The device includes a frame 1 with dressed her a tubular workpiece 2, raskatnoe ball head 3 mounted at an angle , the bellows 4 connecting between a center of the front spindle headstock 5 with the mandrel 1 through ball 6.

The mandrel 1 is connected through a bellows 4 with the front spindle headstock of the machine 5. The working surface of the mandrel grease with a thin layer of grease.

The tubular workpiece 2 pre sealcoat on the one hand, p is raised from its deformation within 20-70% . Ball head set at an angle , on the basis of the calculation formula

= arctan where B = (1/4 To 3/4) S - the amount of overlap of the preceding processing regarding the filing;

S - axial feed, mm/Rev;

D is the specified outside diameter surface of the product after processing, mm. Then enter the hole of the ball cage in the lead-in taper of the workpiece. The machine rise on specified processing parameters (spindle speed n, the longitudinal travel of carriage - S) and include the rotation of the machine spindle and feed.

After finishing work on a given length of the machine is turned off and the part is removed from the mandrel.

1. DEVICE FOR ROTARY EXTRUSION of THIN-walled CYLINDRICAL ARTICLES containing the mandrel, mounted in the spindle, and a work tool in the form of a ballpoint raskatnoe head, characterized in that the ball rescata head is mounted at an angle to the axis of rotation of the mandrel, the value of which is determined from the ratio

< / BR>
where B = (1/4oC 3/4)S - the amount of overlap of the preceding processing relative axial S;

D is the specified outside diameter surface of the product after processing, mm

2. The device under item 1, characterized in that the mandrel od is p. 2, characterized in that the elastic element is used bellows.

4. The device according to p. 2, characterized in that the elastic element using spring.


Same patents:

FIELD: plastic working of metals.

SUBSTANCE: method for making ogival envelope by multi-transition spinning of sheet blank mounted in rotating mandrel at lengthwise motion of spinning tool mounted with gap relative to said mandrel. Gap between spinning tool and mandrel for any point of envelope profile is corrected by value determined according to relation given in claims of invention while taking into account corrections calculated for first envelope.

EFFECT: lowered value of wall thickness difference and mass, enhanced accuracy of geometry of envelope.

1 dwg

FIELD: plastic metal working.

SUBSTANCE: method comprises setting the blank in the mandrel provided with the cylindrical and shaped sections, locking the blank in the cylindrical section of the mandrel, and affecting the blank by deforming rollers. The shaped section is initially formed by moving the rollers in different trajectories during one or several runs. Upon unlocking the cylindrical section, the blank is locked in the shaped section and the cylindrical section is drawn by moving the rollers in the opposite direction.

EFFECT: expanded function capabilities.

1 cl, 3 dwg, 2 tbl

FIELD: plastic metal working; treatment of parts made from niobium-based alloys in cold state.

SUBSTANCE: proposed method includes application of grease on surface of blank to be treated, placing the blank on mandrel and rotary extrusion of it by pressing roller. Blank is coated with nitrocellulose lacquer and is held in air till lacquer becomes sticky; tester leaves trace on surface of lacquer but lacquer does not follow it. Then graphite is applied to sticky surface and blank is placed on mandrel for subsequent treatment.

EFFECT: improved quality of part surfaces due to avoidance of bond between tool and surface being treated.

3 cl, 4 dwg

FIELD: plastic working of metals, possibly by spinning.

SUBSTANCE: method comprises steps of cutting out disc blank of inner envelope and annular blank of ring adapter; forming annular groove in disc blank; fixing in it blank of ring adapter with designed dimensions; subjecting inner envelope combined with ring adapter to spin drawing with use of vertically arranged plug and rolling-out rollers. Operation modes are set according to mechanical properties of material of inner envelope of combustion chamber. Gaps for mounting rolling out rollers relative to plug are corrected while taking into account mechanical properties of ring adapter. Correction value is proportional to relation of metal layer thickness values in place of securing blank of ring adapter. Outer surface of ring adapter is turned in lathe after it has been drawn.

EFFECT: improved quality of inner envelope of combustion chamber with ring adapter.

1 dwg

Rolling machine // 2329111

FIELD: technological processes.

SUBSTANCE: machine contains spindle with holder, finished product remover, pusher that is moved together with billet and cover. Cover has guiding walls with transverse slots and axial opening installed between walls. In wall slots U-shaped clipper is installed. Pusher represents the table that is installed in cover axial opening. Top surface of table protrudes above distributing rollers. U-shaped clipper provides billet fixing on specified surface of table.

EFFECT: simplification of billets feed and their removal from processing zone.

3 dwg

FIELD: technological processes.

SUBSTANCE: adapter mandrel has mounting surfaces on the end that is connected to spindle of spinning lathe, and on the opposite end-basic surface that is coaxial to them. On adapter mandrel pressure mandrel is installed with working section and basic surface reciprocal to basic surface of adapter mandrel. Basic surfaces of adapter and pressure mandrels are arranged as conical with single angle of cone that provides their gapless connection in the whole area of contact after mandrels contraction in axial direction. At that contact is carried out along the whole length of pressure mandrel or along its edges with formation of internal cavity with adapter mandrel in its middle part.

EFFECT: higher accuracy of mutual location of working section and its mounting surfaces for connection with spinning lathe spindle.

3 cl, 2 dwg

FIELD: technological processes.

SUBSTANCE: method for manufacture of profile shells includes blank installation and fixation on profile holder, molding by means of rotary drawing in several passes. Molding is done with deforming rollers with separation of deformation between passes by means of rotary drawing in the form of rotary drafting and rotary deformation of wall, and also between rollers by means of their axial displacement.

EFFECT: high stability of molding process, reduction of passes amount and manufacture labour intensity.

7 cl, 3 dwg

FIELD: technological processes.

SUBSTANCE: in method of rotary drawing blank is installed on profile holder and affected with deforming rollers. Blank profile is formed with separation of deformation between rollers into several sites by means of their radial displacement with equality of radial forces.

EFFECT: provides possibility of complex profile shell rotary drawing, with large length and high diameter difference, at high stability of deformation process.

4 cl, 2 dwg, 1 ex

FIELD: technological processes.

SUBSTANCE: invention is related to manufacture of sectional shells from high-carbon and refractory steels and aluminium alloys with low plasticity, large length, cylindrical and curvilinear shape. Sectional holder is heated in gas flame of burner, billet is installed and fixed in sectional holder. Then billet is heated in burner gas flame. Heating of billet and holder is realised with control of temperature by pyrometer and control of gas supply in burner. Gas burner for heating of sectional holder and billet is installed in the unit of one of rollers above the billet, and pyrometer is installed in the unit of the other roller under billet. Simultaneously with billet heating, sectional part is shaped into several stages by rollers with different profile of working surface, which are installed with displacement between each other and with different gaps with holder. Afterwards cylindrical section is shaped in cold condition with less intense feed, compared to shaping of profile section.

EFFECT: higher stability of process, accuracy of geometric shape and quality of processed surface, reduction of stages number and lower labour-intensiveness of their manufacture.

7 cl, 3 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to metal deformation process. Particularly it relates to method of producing of thin-walled heavy shell of ogival form with reduced inclination of generatrix from minor diameter to major. Method is implemented by means of holder at lengthwise movement no less than two spinning tool, installed with clearance relative to holder with ability of its correction during the process of treatment by means of rotary drawing from plate stock per three passage. The first passage is implemented without change of blank thickness. Following passage of rotary drawing is implemented with calculated deformation ratio on generatrix length till the critical point, specified by inclination value of generatrix and relation between diameter and shell-wall thickness in particular point. Following passage - with minimal deformation ratio. Final passage is implemented with calculated deformation ratio till critical point and with maximal deformation ratio after it.

EFFECT: accuracy increasing of geometry, maintainability, constructional durability.

3 cl, 1 dwg, 1 ex