SU783015A1 - Nozzle to piercing press - Google Patents

Description

The invention relates to pressing equipment, in particular to mouthpieces of piercing presses for squeezing carbon-green green blanks, and can be used in the refractory, chemical and metallurgical industries.

Closest to the invention, the technical solution is a mouthpiece to a press, including a housing with forming and calibrating zones 1,

In the forming zone, the mass is compacted and obtains a shape similar to that of the finished billet, and in the calibrating zone, the billet acquires the required dimensions.

However, the preform at the exit has a significant field of deviation of the diameter bye length (1-3% of the diameter of the preform) in connection with the presence of an elastic consequence due to residual stresses of the carbon-graphite material. This leads to the disappearance of microcracks in the peripheral layers of the workpiece and the over-expenditure of raw materials.

The aim of the invention is to improve the accuracy of the geometric dimensions and improve the surface quality of the molded products.

The goal is achieved by the fact that in the mouthpiece to the piercing press, including a body with forming and calibrating zones, the calibrating zone is filled with a variable stepwise increasing diameter, and the initial diameter and the length of the output of its parts relate to the diameter of the output part, respectively 0.98 0.995 and 0.5-1.

The drawing shows a general view of the mouthpiece, Mouthpieces 1 consists of the forming zone 2, the initial part 3 of the calibrating zone and the output part 15 of it 4. The mass 5 is loaded into the container 6 of the laboratory piercing press, is pre-pressed, and then injected with the mouthpiece 1 through the plunger 7. The mass 5, moving through the forming rhona 2 mouthpiece 1, condenses and obtains the required shape, is calibrated in the initial part of the 3rd caliber, and then enters the output part 4, increases in perimeter under the action of internal residual

3 78

stresses, surface irregularities are straightened.

Example. The hot mass is prepared in a laboratory 10-liter mixing machine based on a mixture of pyrolysis and cracking coke in a ratio of 1: 1 {GOS1 327862) and B1 1-temperature pitch grade B (GOST 10200-73) with a softening temperature of 85-90 ° C. Fractional coke composition is as follows:

-4 -h 2.5 18.7.:;, -2.5 + 1.0 - 9.57.

-0.08-- 28.49g.

-0, 43.4Vf

The prepared mass 5 is loaded into the container 6 of the laboratory horizontal opposing press with a force of 60 tons (container diameter 150 mm), the temperature of the loaded mass is 140 ° C, the container is t 160 ° C, the mouthpiece tf, f 160 ° C, is pressed in 200 kg / cm for 3, and then squeezed out using the plunger 7 through the mouthpiece 1, the diameter of the initial part of the calibrating zone d) 59.3 mm, and the diameter of the output part d2 60 mm and the length of the output part Pi 30 mm (d liJ- jT 0.99; 0.5); Mass 5 from Container 6 is extruded into the forming 0 zone 2, where it is compacted and added form with a section similar to the section of the finished billet, then fed to the initial part 3 of the calibrating zone, in which it receives the specified dimensions, while moving to the output part 4 of the calibrating zone, compensation of the elastic aftereffect occurs.

EXAMPLE 2. The experiment was carried out as in Example 1, with dj 60.1 mm, ds 59.3 mm (0.986), and e 60 mm

(EA 1).

Example 3 A hot mass is prepared in a laboratory 10-liter mixing machine based on a mixture of pyrolysis and cracking coke in a ratio of 1: (GOST 3278--62 and high-temperature pitch of grade B- (GOST

10200-73) with a softening point of 85-90 ° C. Fraktsonny composition kisson following-

-4 +2.5 - 18.7;

-2.5 + 1.0 - 9.5 - ::. - 0.08-28.4%

-0.07- 43.4;

The prepared mass 5 zag is stored in a container 6 of a laboratory horizontal firmware press with a force of 60 tons (container diameter IjO mm), with;) the volume Te.vinepatypa of the load mass tA ,. 140 ° С, container t - 160 ° С, mouthpiece t. - 160 ° С, iodiased with pomoshk) ipunger 7 through a pre-shaped mouthpiece, the diameter of which is equal to 60 mm.

The use of a compact piece of the proposed design with compensation for the external consequence of pressing carbon-graphite blanks reduces the size deviation of blanks by 4-9 times compared to the known standard: improve the surface quality of the blanks, increase Dk green blanks to 1.69- 1.71 G / CM, smart: igg ne) raw material consumption): materials.

Formula and: /. about b ete n i

Mouthpiece to the piercing press, including: 1st case with forming and calibrating zone, that is, with the aim of increasing the accuracy of geometrical dimensions and improving the surface quality of the molded products, : a stepwise increasing diameter over the length, the diameter of the initial part and the length of the first part of it being related to the diameter of the output part, respectively, 0.98-0.995 and 0 ,.

Source: ethics information, with; to be taken into account during the examination

1. USSR author's certificate N ° 95546, cl. in 28 in 3/26, 1951 (prototype).

Claims (1)

Claim The mouthpiece to the piercing press, which includes a housing with a forming and calibrating zones, is characterized in that, in order to increase the accuracy of the geometric dimensions and improve the surface quality of the molded products, the calibration zone is made with a variable stepwise increasing diameter along the length, and the diameter of the initial and the length of its output parts refers to the diameter of the output part, respectively, 0.98-0.995 and 0.5-1.