A method of manufacturing a stamp tense constructions

 

(57) Abstract:

Usage: metal forming, manufacturing of blades for gas turbine engines. The inventive designate the amount of protrusion of the conical insert on heat-treated cone holder, equal to the amount of constructive interference, divided by twice the tangent of the angle of the wedge. Perform hot pressing wedge insert in the appropriate holder, with the required amount of pryroxene transverse sample clip when heated, must satisfy the in f-Le condition of inequality. 3 Il.

The invention relates to the processing of metals by pressure, in particular the designs of the stamps for the manufacture of blades for gas turbine engines.

A known method of manufacturing a stamp of hard structures (ed. St. N 253558, CL 21 J 13/02, 1967), which contains the outer race to the bottom, in which an interference press fit of the inner ring with insert.

The disadvantage of the design of the stamp is Nadezhdinsky insert all the way into the bottom and there is no guarantee of the desired compressive stress.

A known method of manufacturing a die hard design by hot pressing with isolagiovanni steel martensitic class. Insert, and a through hole in the holder is made with a taper within 1/60...1/23. Ferrule quenched and tempered for hardness Re35. . . 45. Stamp tense structures assembled by hot pressing, the bimetallic conical insert electroslag remelting in through the tapered hole carriers [1].

The disadvantage of the method of manufacturing a stamp is to reduce the rigidity of the cage when increasing the size of the insert, which reduces tension and compression fracture of the insert during hot stamping blanks with thin profile.

The aim of the invention is to improve the quality of manufacturing of the stamp.

This is achieved by the fact that, in the proposed method of manufacturing a stamp tense structure by hot pressing with tension wedge insert to the corresponding heat-cone clip before and after machining to designate the amount of protrusion of the insert above the ferrule, equal magnitude of constructive interference, divided by twice the tangent of the wedge, and the required increment value of the cross-sample holder with heating for injection should satisfy the condition of inequality:

N>Nto> , where Nto- the amount of preload is Erste clip (+ 0.22 mm);

h- maximum deviation of nominal size insert (- 0.22 mm);

Z - value of the roughness of the mating surfaces 5 class (0,01.. .0,02 mm).

The quality of the stamp is provided by fully pressing the insert against the bottom and provide the desired compressive stress.

In Fig. 1 shows a block stamp, cut, and Fig. 2 - scheme of connection of the holder and the insert before pressing (section); Fig. 3 - insert matrix after pressing the incision.

Stamp tense consists of a casing 1 made of heat-resistant die steel and pressed into her with tightness of the working insert 2 high-speed steel to lock in the bottom 3. Insert 2 and sample 4 in the holder 1 is made with an angle = 1o+ 5' and have the shape of a wedge. On the upper side of the insert 2, the surface of which is flush with the surface 5 of the casing is made: on the matrix - bearing surface 6, the punch - pressing surface 7. The matrix and the punch stamp structurally differ only in the profile of the upper part of the insert 2. For example, for punching blanks blades on the matrix has the profile of the trough, and the punch - profile backrest. The working box 2 is made wedge-shaped with the technology of Prip 1 is subjected to annealing, quenched and tempered for hardness RCe31,5...36,5. The working box 2 then annealed, quenched and triple tempered by mode for high-speed steel hardness NTSe61...66-blasted metal sand and pressed on the press and heated to a temperature of 500. ..540aboutWith the clip 1 to the stop in the bottom 3 last. After pressing technological allowance is removed.

The clip is made with constructive interference Ntoequal to, for example, 0.6 mm of the working insert 2 made of high speed steel R6M5. To create the desired tension compression before pressing the insert 3 should be on the value of h (Fig. 2), is equal to 17.2 mm, which is determined by the formula:

h = , (1) where Nto- the value of the preload structurally selectable under the injection, mm

To determine the structural tightness of Ntotake, for example, the following values: H= 0.22 mm; h= 0.22 mm; Z = 0.02 mm x 2 = 0,44 mm Substitute given values into the formula:

Nto> = 0,240 mm

(2) Structurally Ntoaccept 0.6mm; tg1o= =0,01746. Substitute values into the formula (1) and obtain h = 0,6 : (2 x 0,01746) = =17,2 mm

To determine the required size of the increment N cross-sampling d
t= 14 x 10-6/oC; dm= 1000 mm; T = 500aboutC.

Substitute the given values into the formula:

N =tx dm(T-20), (3) where T is the temperature of the shroud under the injection,aboutC;

tthe coefficient of linear expansion, 14 x 10-6/oC;

dmthe transverse size of the sample on the surface of the shroud, mm;

20 - ambient temperature aboutTo get N equal 0,672 mm

From the calculations it is seen that when the heating cartridge 500aboutWith the provided landing insert until it stops at the bottom, as N > Ntoi.e. 0,672 > 0.6 to inequality observed, and, as a consequence, in the working box 2 created tension compression ratio that satisfies the inequality.

Experimental research stamp for stamping, for example, blanks vanes third stage high-pressure compressor of the CCD of the hard-material VTM showed satisfactory resistance to 2500. ..4000 bumps at consistently high quality presswork.

A method of MANUFACTURING a STAMP TENSE CONSTRUCTIONS, including machining wedge insert and hot pressing her the means of stamping, before machining insert designate the amount of protrusion of the insert above the ferrule, equal magnitude of constructive interference, divided by twice the tangent of the angle of the wedge, and the required value of N increment transverse sample clip when heated under the injection must satisfy the inequality condition

N>Nto>

where Nto- the value of the preload structurally selectable under the injection, mm;

H- maximum deviation of the nominal hole size casing, mm;

h- maximum deviation of nominal size insert, mm;

Z - value of the roughness of the mating surfaces, mm.

 

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