Method for production of hollow products

FIELD: technological processes.

SUBSTANCE: invention is intended for production of hollow high precision pipe forged pieces with alternating profiles of external surface by cold radial compression. Method for production of hollow products with alternating profile of external surface includes production of initial billet, its mechanical processing with production of hollow billet, fixation of hollow billet between support and driving devices of radial clamping machine, deformation of hollow billet by means of radial clamping in holder installed in opening of hollow billet during length feed of the latter and final mechanical processing of deformed forged piece. Radial compression is done along the whole length in two operations, the first of which is carried out to produce semi-finished product with unstrained section. After the first operation of radial compression produced semi-finished product is turned by 180°, installed with unstrained section in direction of support device, and the second operation of radial compression is carried out.

EFFECT: high precision of products.

2 cl, 3 dwg

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of cold radial compression of the hollow, with a variable profile of the outer surface of the tube forgings of high precision.

A known method of manufacturing a threaded stepped shaft (RU # 2060083, IPC B21D 41/00, publ. 20.05.96, bull. No. 14), adopted for the prototype. The method includes the manufacturer of the original piece, its mechanical processing of obtaining a hollow workpiece, the fastening of the hollow billet between the retaining and powered devices radially crimping machine, the deformation of the hollow billet by radial compression mandrel installed in the hollow hole of the workpiece when the longitudinal feed of the latest, and final machining strain forging.

The disadvantages of the prototype:

1. Powered of the billet radial compression is not exposed, the metal is not hardened by plastic deformation.

2. For hollow products with stepped conical shape of the outer surface, in which the stage with maximum diameter is located closer to the middle of the product along its length, the length of forgings from powered site up to speed with the maximum diameter is also manufactured with the maximum diameter.

The invention solves the problem: snizeni the material, labor and energy costs in the manufacture of hollow articles.

The technical result obtained by carrying out the invention is to provide a method of manufacturing a cold radial compression of the tube forgings of high precision for products with variable (speed) profile of the outer surface and the ratio of the length of the product to the diameter of the holes L<d>10 for the plastic deformation of the workpiece along the entire length.

This technical result is achieved in that in the method of manufacturing hollow articles with a variable profile of the outer surface, including the manufacturer of the original piece, its mechanical processing of obtaining a hollow workpiece, the fastening of the hollow billet between the retaining and powered devices radially crimping machine, the deformation of the hollow billet by radial compression mandrel installed in the hollow hole of the workpiece when the longitudinal feed of the latest, and final machining strain forgings, new is the fact that the radial compression of the hollow billet carried out along its entire length for the two operations, the first of which is performed with the receipt of the material with the undeformed area, after the first the operation of the radial compression of the obtained semi-finished product turns n is 180°, having undeformed plot to the retaining device, and generate a second operation radial compression, the diameter of the hole is deformed forgings less than the diameter of the semi-finished product.

Deformation of the workpiece along the entire length for two surgeries radial compression by turning it after the first operation of the radial compression at 180° allows to produce cold radial compression of the hollow with a variable (stepped cylindrical-conical) profile of the outer surface of the tube forgings of high precision (tolerances on the diameters of the outer surface 12...14 degree and with a tolerance on hole 6...8 quality according to GOST 25347-84), for products with respect to the length (L) to diameter (d) of the hole L/d>10 and finish not rougher than Rz 20.

Based on the above we can conclude that the invention has a "novelty" and "inventive step".

The invention is illustrated by drawings, where

figure 1 - the hollow billet under radial compression, obtained by mechanical treatment, including deep drilling through holes in the original procurement and processing of external surfaces and base elements,

figure 2 - the material after the first operation cold radial compression,

figure 3 - after the second forging operation radial compression placed in her holster.

d 0; D0; L0accordingly, the bore diameter, outer diameter and length of the workpiece under radial compression,

d1; D1; D'1, l1; l'1; L1, ltoaccordingly, the diameter of the holes, the diameters of the 1st, 2nd speed, the length of the 1-th, 2-th stages, the length of the semi-finished product, the length of the conical section of the material after the first operation cold radial compression,

lp- the length of the shape of the plot,

d2; D2; l2; l2; l'2accordingly, the diameter of the hole, the diameter of steps, length of the 1st and 2nd stages, the length of the forging after the second operation cold radial compression,

dmax- maximum diameter of the mandrel;

1 - blank;

2 - the material;

3 - forgings;

4 - retaining device;

5 - powered device;

6 - pot.

The method is implemented as follows. On the basis of the geometrical parameters of the stepped profile of the outer surface of the product design forgings 3 form the outer surface, as close as possible to the shape of the outer surface of the product with minimum allowance for final machining that must be obtained after the second operation cold radial compression; then design a semi-finished product 2 that is to be obtained after the first operation cold radial is th compression.

Taking into account the permissible degree of deformation, satisfying the condition 0≤ε<ψ, and the maximum amount of forgings design of the hollow billet 1 under radial compression. Choose the diameter of the original piece from the terms of the adequacy of the allowances for processing the outer surface taking into account the withdrawal of the drill in deep drilling and removing the defective layer from the surface of the original piece. The original billet machined to the dimensions of the hollow billet 1. Install hollow billet 1 in retaining 4 and 5 powered device radially crimping machine and fix it. The hole in the workpiece introducing the mandrel 6 with a conical working surface (taper 0,1...0.05 mm to 100 mm length) so that calibrating the diameter of the mandrel was in the area of the gage section of strikers. Produce cold radial compression of the workpiece in the size of the semi-finished product during its rotation around the axis and the longitudinal flow in the zone of deformation. After performing the operation, the mandrel 6 is extracted from the semi-finished product 2, the semi-finished product is extracted from radial crimping machine. Change tooling (frame, copier, retaining and powered device), turn prefabricated 180° (undeformed area LHto the retaining device), fixed between the retaining and powered devices, enter the pot in an area of the caliber of the irradiation area of the heads (similar to the first operation) and produce cold radial compression forging 3. After the second operation cold radial compression of the outer surface of the forging has a multi-level, close to the geometric surface shape, and the hole forgings 3 obtained in the second operation cold radial compression, smaller holes of the semi-finished product 2 obtained in the first operation cold radial compression, a value close to the minimum required clearance between the bore diameter of the semi-finished product and the maximum diameter of the mandrel used in the second operation radial compression (d1-dmax). After radial compression to extract the mandrel from the hole forgings, raskrepljajut it and extract the deformed along the entire length of the forging of the radial crimping machine. Machining if necessary, remove the differential diameters of the holes donovania or deployment process exterior surface in the geometric parameters of the product.

1. Method of making hollow articles with a variable profile of the outer surface, including the manufacturer of the original piece, its mechanical processing of obtaining a hollow workpiece, the fastening of the hollow billet between the retaining and powered devices radially crimping machine, the deformation of the hollow billet by radial compression mandrel installed in the hole of the STS is oteley workpiece when the longitudinal feed of the last and final machining strain forgings, characterized in that the radial compression of the hollow billet carry out the entire length of the two operations, the first of which is performed with the receipt of the material with the undeformed area, and after the first operation the radial compression of the obtained semi-finished product is turned by 180°, have the undeformed area to the retaining device and produce a second operation radial compression.

2. Method of making hollow articles according to claim 1, characterized in that the diameter of the hole is deformed forgings less than the diameter of the semi-finished product.



 

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