SU884857A1 - Apparatus for hydrostatic extruding of tubular articles from powder - Google Patents

Description

(54) DEVICE FOR HYDROSTATIC PRESSING TUBULAR PRODUCTS FROM POWDER

i

The invention relates to powder metallurgy, in particular, to devices for hydrostatic pressing of tubular articles from powder.

A device for pressing powder products is known, comprising a hollow body and two punches moving along the inner surface of the body til.

A disadvantage of this device is the impossibility of obtaining in it equal-length long-length articles due to the loss of the pressing force due to friction of the powder against the walls of the die and the ends of the punches.

The closest to the proposed technical essence and the achieved effect is a device for hydrostatic pressing tubular products from powder, including a perforated holder, an elastic sheath located on the inner side of the holder, plugs installed on the ends of the substrate, and a central rod C 23.

A disadvantage of the known device is the low quality of long tubular products resulting from the action of axial force during hydrostatic pressing on the ends of the product, especially at the beginning of the process, as a result of which the thickening and non linearity of the product appear.

The purpose of the invention is to enhance the quality of products.

Claims (2)

To achieve this goal, a device for hydrostatic pressing of tubular products is made of powder, including a perforated holder, an elastic shell located on the inner side of the holder, plugs mounted on the ends of the holder, and the central rod is provided with a housing with a threaded force cap, a hinge and compensators. seals, with compensators-seals installed between the ends of the cage and plugs, and the cage is installed at the bottom of the housing. with the possibility of contact through the hinge with the housing cover. Fig, 1 shows the proposed device, the cut; in fig. 2 - top n part of the device when filling. The device comprises a housing 1 with a choke 2 above 3. The sylvian valve 4 is connected with the housing by a threaded attachment. The external perforated cover 5 with a thin-walled elastic shell 6 placed on the inner surface of the holder 5 is sealed with plugs 7 and 8 along the ends of the clip 5. The plug 7 is installed at the bottom of the body, and the plug 8 interacts with the hinge 9 mounted on above 4. Compressors-seals 10 and 11 are installed between the ends of the yoke 5 and the plugs 7 and B. When the device is filled with powder, instead of cover 4, a bolt 12 with a hole is installed, and instead of plug 8, into the crown 13 (Fig. 2). In addition, in the inner cavity of the yoke 5 is placed a forming rod 14. The device works as follows. The cavity is filled with powder, filling it through the funnel 13 into the cavity of the cage 5. Then remove the cover 12 and the funnel 13 and replace them with a plug 8 with a compensator 10 and a cover 4 with a hinge 9. At the end of the cover seal the holder 5, compressing the compensators 10 and 11 while the hinge does not allow the cap B to rotate relative to the cap 4 and the holder 5. The sealing of the holder is achieved by the force closure acting on the force compensators through the cap to the bottom of the housing. The assembled device is then placed in a hydrostat and pressurized with a fluid. The fluid through the nozzle 2 enters the cavity of the housing 1 and through the holes in the holder 5 acts on the shell 6. The shell 6, squeezing under the action of the liquid, compresses the powder. The expansion joints 10 7 and 11 are also compressed, supporting the sealing of the inner surface of the sleeve 5 and the casing 6 and relieving the powder filling from the action of external axial force. The powder is compressed by the action of a radial pressure component. Compared with the known device, the offered one provides more uniform thickness, straightness and equal density of products. Thus, by improving the quality of the product, the yield of scrap is drastically reduced, the machining allowance is eliminated to remove the thickness variation and curvature of the blanks, and it becomes possible to press longer products, which gives an economic effect when introducing only one enterprise in an industry of at least 3 thousand rubles per year. The invention of the device for hydrostatic pressing of tubular products from powder, including a perforated holder, an elastic shell located on the inner side of the cage, plugs ycf bore at the ends of the holder, and a central core, characterized in that, for the purpose of quality products, it is provided housing with a threaded core lid, a hinge and compensator-seals, with compensators-seals installed between the ends of the cage and plugs, and the casing is installed at the bottom of the Kopnycf with Spine contact through the hinge of the body through the hinge. Sources of information taken into account in the examination 1.Vakovsky B.C. and others Poroshkova metallurgists. Whit 4, Sat. works NIITavtoprom. M., 1956, p. 43. 2. USSR author's certificate IP 631360, cl. B 30 B 15/02, 197B.