Manufacturing method of cylindrical shells

FIELD: metallurgy.

SUBSTANCE: invention can be used at manufacturing of cylindrical shells by rotary drawing with thinning from martensite - ageing steels with wall thickness ratio. Blank is installed on mandrel with interference. Rotary drawing is implemented with specified degree of deformation and with value of relative interference.

EFFECT: improvement.

2 dwg

 

The method relates to the treatment of metals by pressure, in particular, to methods for producing cylindrical shells by rotating hood with thinning.

A known method of manufacturing cylindrical shells high geometrical accuracy by rotational hood with thinning, including the installation of blanks on the mandrel with an interference fit that allows you to create the walls of the billet internal tensile stress, significantly weakening the residual voltage and, thus, provides the minimum error in the form of a shell after removing it from the mandrel (Lguten, Speakable "Rotary extractor cylindrical shells". - M.: Mashinostroenie, 1984, p.62-64).

The disadvantage of this method is the lack of data on manufacturing high-precision thin-walled workpieces, made of Maraging steels by rotational hood.

The technical objective of this project is getting thin membranes with relative wall thickness of 0.07...0,40%made of Maraging steels.

This task is solved by the method of manufacturing cylindrical shells of Maraging steels with relative wall thickness of 0.07...to 0.40% by rotary hood with thinning with degrees of deformation 60...68% when setting the workpiece on the edit with the relative tightness Δ/D 0=0,02 0,06...% (where Δ is the magnitude of the tension, mm, D0the diameter of the workpiece before machining, mm).

Additionally, the rotational hood hold-back method, i.e. the direction of flow of the material coincides with the direction of movement of the pressing elements.

In addition, the rotational hood hold-back method, i.e. the direction of the flow of material opposite to the direction of movement of the pressing elements.

Additionally, the rotational stretching is carried out at a number of revolutions of the spindle n=200...700 rpm

In addition, the rotational stretching is carried out at the longitudinal carriage feed s=20...350 mm/min

Additionally, the rotational stretching exercise videos.

In addition, the rotational drawing rollers the rollers are calibrating the belt to achieve the specified surface roughness of the shell.

Additionally, the rotational drawing rollers the rollers have a special ledge, allowing to reduce the height of the influx of material in front of the rollers and thereby to eliminate the deterioration of the surface of the shell.

In addition, the rotational drawing rollers, the number of rollers is 3 pieces

The method is illustrated in the drawings:

Figure 1 - diagram of the rotary hood direct method.

2 is a diagram of a rotary exhaust-back method.

The method implemented is tsetse as follows. Cylindrical workpiece 1 from Maraging steel mounted on the mandrel 2 with an interference fit relative value which is 0.02...0,06%, then set the process parameters of the rotary hood: the number of turns is n=200...700 rpm and the longitudinal carriage feed - s=20...350 mm/min, followed by rotating the hood direct (1) or reverse (figure 2) method with the degree of deformation 60...68%, at the same time as the pressing elements using three roller 3 with calibrating the belt 4 to achieve the specified surface roughness shell, as well as special tab 5, allowing you to control the height of the influx of material in front of the roller and thereby to eliminate the deterioration of the surface of the shell.

Thus, the application of this method allows to obtain the deformations 60...68% of the cylindrical shell of the Maraging steels with relative wall thickness of 0.07...0,40%with raznesennost max 0.005 mm, the surface roughness is not more than Ra 0,80 and minimum distortion of the shell.

1. A method of manufacturing cylindrical shells of Maraging steels with relative wall thickness (h/D=0,07...to 0.40% by rotational hood with thinning, including the installation of blanks on the mandrel with an interference fit its rotary hood with the degree of deformation Ψ=60...68% and with the magnitude of the relative tightness of Δ/D 0=0.02 to 0.06 percent.

2. The method according to claim 1, in which the rotary extractor carried out by the direct method, in which the direction of flow of the material coincides with the direction of movement of the pressing elements.

3. The method according to claim 1, in which the rotary hood hold-back method where the direction of flow of the material opposite to the direction of movement of the pressing elements.

4. The method according to claim 1, in which the rotary extraction is carried out at a number of revolutions of the spindle n=200...700 rpm

5. The method according to claim 1, in which the rotary extraction is carried out at the longitudinal carriage feed s=20...350 mm/min

6. The method according to claim 1, in which the rotational stretching exercise videos.

7. The method according to claim 6, in which use rollers with calibrating the belt to achieve the specified surface roughness of the shell.

8. The method according to claim 6, in which use rollers with the guide to control the height of the influx of material before the movie.

9. The method according to p-8, which uses three rollers.



 

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