Mold for pressing of powder products with the outer surface of complex shape
(57) Abstract:The invention relates to the mold for extrusion of powder products with the outer surface of complex shape. Essence: after filling the forming cavity powder hole closes a split upper punch 1. When the application efforts press the upper punch pushes in front of a moving ring 4 and the powder is moved into the cavity of the punch, which is its split parts in the fixed ring 3, preventing the divergence of wedges: original powder is compacted under a floating bottom punch 8 and partially flows into the spherical cavity of the punch. By means of the frictional force of the compression powder sliding ring 4 is entrapped in the space between the latter and the rod 7 and is condensed. Floating punch 8 under the influence of elastic forces moved down, feeling countering the bottom of the spring element 10. At the end of the pressing of the upper punch 12 displaces the sliding ring 4 beyond the forming cavity and produces the final compression of the powder into the desired product shape. The mold used for the molding of articles having outer transitions in height and curved surfaces. 1 Il. Known mold for molding articles from powder , consisting of an upper punch, coaxially with the upper punch holder, in the case where the stationary ring, the matrix, coaxially with the upper punch of the lower stationary punch, the lower floating punch, with a spring element and placed on the lower stationary punch slidable relative to it. The presence of fixed and floating lower punches allows to obtain products with external transitions in height.A disadvantage of the known devices is the inability to manufacture products that combines both external transitions in height and curved surfaces.The closest to the invention by the technical nature of a mold for molding articles from powder , including split upper plug, coaxial with the upper punch holder, in the case where stationary ring and moving relative to the stationary ring, with a spring element, coaxially with the upper and lower stationary punch.A disadvantage of the known designs is the inability to manufacture products, which has also a curved poverhnostyu with the upper punch holder, in the case where the stationary ring and moving relative to the stationary ring, with a spring element, coaxially with the upper punch of the lower fixed plug, the axis of which is placed a rod, the lower floating punch, equipped with two spring elements and placed on the lower stationary punch slidable relative to it.The slip ring holder is made with a ring on the length of the cavity, the diameter of which is equal to the outside diameter of the flange portion of the floating punch and is further provided with placed in said annular cavity two spring elements.The presence of the circular cavity allows you to place it lower floating plug located between the two spring elements, which provides the possibility of obtaining products having outer transitions in height, while the condition of raveplanet in different sections of the product. At the same time provides the possibility of obtaining this product a curved surface.Known as the design of the mold  does not allow us to manufacture products containing both external transitions in height, Slovenia, the right part is in the position of removing.Mold consists of a slotted upper punch 1, coaxially with the upper punch holder 2, in the case where the fixed ring 3 and the sliding ring 4, with a spring element 5, coaxially with the upper punch of the lower stationary die 6, the axis of which is placed a rod 7, the lower floating punch 8, provided with two spring elements 9 and 10, and the base of the mold 11.Mold is as follows. After filling the molding cavity with the powder hole closes a split upper punch 1, playing in the final stage of pressing the role of the matrix. When the application efforts press the upper split punch, moving down, pushes in front of a moving ring 4 and the powder is moved into the cavity of the punch. When this punch for its split parts includes a stationary ring 3, preventing the divergence of the wedges.First of all the powder densification starts floating bottom punch 8 and the powder partially flows inside a spherical cavity split punch. When the powder will completely fill the cavity of the upper punch, begins compression of the powder. When the compression paraskenia pressed powder sliding ring 4 is entrapped in the space between the ring 4 and the rod 7 and is condensed. The lower floating punch 8 under the influence of elastic forces moved down, feeling countering the bottom of the spring element 10.At the end of the pressing of the upper punch displaces the sliding ring 4 beyond the forming cavity (the floating movement of the bottom punch 8 down because available on the lower stationary punch 6 annular ledge terminates and produces the final compression of the powder in article 12 of the required form. While pulling the product together with the upper punch out of range of the stationary ring 3, slotted part of the plug apart and detail freely extracted from it.The use of the invention allows manufacturing of a product that combines both external transitions in height and curved surfaces, for example packagefilename sprayers, used for cooling of the ingot in machines continuous casting. It extends the functionality of powder metallurgy, reduces cost while improving the quality of products containing external transitions in height and curved surfaces. Mold FOR PRESSING OF POWDER PRODUCTS WITH OUTER SURFACE is e in the case of the stationary shroud ring and moving relative to the stationary ring with a spring element, coaxially with the upper punch of the lower stationary punch, placed along the axis of the last pin, the lower floating punch with two spring elements placed on the lower stationary punch slidable with respect to it, characterized in that the lower floating punch made with flanges on its outer surface, and a sliding ring is made with an annular cavity along its length, the diameter of which is equal to the outside diameter of the flange portion of the floating punch, and with two extra springs housed in its annular cavity.
FIELD: powder metallurgy, namely apparatuses for pressing powders.
SUBSTANCE: apparatus includes movable and stationary plates, upper and lower punches, pressing block in which die is arranged. Pressing block has two part; upper of said two parts is secured to movable plate and lower part is secured to stationary plate. In one part of block there is additional drive unit for moving punch in plane normal relative to motion direction of movable plate. Pressing block is provided with two carriages placed in guides with possibility of motion in two mutually normal directions. One carriage is arranged in guides of second carriage. Each part of pressing block has four profiled supports. Die is in the form of four shaping members with flat working surfaces. Said members are mounted on profiled supports in such a way that their working surfaces form closed loop. Each member has slit guide normal relative to its working surface and stem mounted in slit guide of adjacent member. Working surface of shaping member coincides with one surface of its stem.
EFFECT: increased density of pressed blanks, enhanced uniformness of density distribution in volume of blank.
2 cl, 4 dwg
FIELD: production of quickly cooled magnetic alloy for making nano-composite magnets and magnets with binder used in electric motors, sensors and so on.
SUBSTANCE: method comprises steps of preparing melt and forming quickly crystallized alloy. Composition of melt has common formula: (Fe1-m Tm) 100-x-y-z Qx Ry Mz where T is Co and(or) Ni; Q is B and/or) C; R - rare earth element; M is selected from Al, Si, Ti, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au, Pb; mole fractions x, y, z and m satisfy next inequalities: 10 at.% ≤ x ≤ 35 at.%; 2 at.% ≤ y ≤ 10 at.%; 0 at.% ≤ z ≤ 10 at.%; 0 ≤ m ≤ 0.5. At stage of producing quickly solidified alloy, melt is poured onto guiding member whose guiding surface is inclined relative to horizontal plane. Melt flowing down on guiding surface is fed through opening at least of one casting duct onto contact zone of cooling roll surface.
EFFECT: possibility for providing uniform structure of magnetic alloy.
33 cl, 6 dwg, 3 tbl, 2 ex
FIELD: powder metallurgy, namely processes for pressing elongated complex-shape articles, possibly in machine engineering.
SUBSTANCE: method is used for pressing elongated articles of powder in press-molds with die having horizontal parting. Method comprises steps of pouring powder to lower part of die, drawing together upper and lower parts of shaping die; shifting powder by moving lower punch to upper part of die and pressing it. At extraction article from press-mold its upper part is released due to opening upper part of die along one or several planes passing along (or parallel to) vertical and(or) inclined axis of upper part of pressed article. Simultaneously upper and lower parts of press-mold are opened along horizontal parting plane.
EFFECT: enhanced quality of article, enlarged manufacturing possibility at making complex-shape articles.
3 cl, 3 dwg
FIELD: powder metallurgy, namely processes for removing plasticizing agent.
SUBSTANCE: method for capillary type removing of binder comprises steps of preparing mixture, mixing it with plasticizing agent, pressing prepared mixture and heating it for removing plasticizing agent. Before pressing, highly volatile liquid is added to mixture in quantity consisting 0.4 - 0.6 of pore volume of pressed material for dissolving plasticizing agent. Heating is realized before sintering until volatile liquid separation is ended and plasticizing agent appears on surface of pressed material.
EFFECT: shortened time period for removing plasticizing agent, improved quality of articles.
3 cl, 1 dwg, 2 ex
FIELD: powder metallurgy, namely methods for pressing powder material at presence of liquid.
SUBSTANCE: method for pressing powder material comprises steps of introducing to powder volatile liquid and pressing powder; supplying liquid at side of pressing punch in quantity consisting of 2 - 3 volumes of pores of pressed blank. It is possible to perform pressing at simultaneous supply of liquid till termination of process. Method allows press non-plastic powders without plasticizer, partially remove plasticizer and perform impregnation. Press-mold includes die with upper portion having inner cavity, cavity for liquid and outer part. Apparatus for feeding liquid is in the form of cylinder with symmetrical through openings in walls and it includes piston for supplying liquid to inner cavity of die.
EFFECT: improved quality of articles.
7 cl, 11 dwg, 1 tbl, 8 ex
FIELD: powder metallurgy, namely preparation of hard-alloy charge.
SUBSTANCE: method for plasticizing charge with paraffin comprises steps of preparing mixture containing hard-alloy components; adding paraffin and diluting agent to prepared mixture; using gasoline as diluting agent while dispersing paraffin in gasoline in quantity no more than 5%. Quantity of paraffin in relation to quantity of hard-alloy components is in range 0.5 - 1%. Hard alloy mixture with gasoline-dispersed paraffin is prepared in cavitation zone of ultrasound field.
EFFECT: improved density and strength of charge.
FIELD: powder metallurgy, namely pressing blanks of charge with low content of plasticizer.
SUBSTANCE: method for pressing blanks from charge comprises steps of adding plasticizer in quantity 0.5 -1.0% to hard-alloy mixture; then pressing mixture.; before extracting blank from press-mold acting upon it by means of force impulse or set of force impulses whose value consists at least of 0.1 - 0.15% of specific pressing effort.
EFFECT: enhanced density, strength and strength uniformity of blank.
9 dwg, 1 ex
FIELD: powder metallurgy, namely manufacture of hard alloy rods with cross section variable along axis, possibly production of end tools such as end milling cutters, reamers, broach bits.
SUBSTANCE: method for forming hard alloy blank for making end tool comprises steps of adding to powder of hard alloy mixture plasticizing agent in quantity 1.8 - 2.5 %; pressing slab blank whose density is by 30 - 40% less than that of final blank and whose cross section less than that of final blank; pressing prepared slab blank in die whose inner cavity corresponds to configuration of final blank. Mass values of slab blank and final blank are the same.
EFFECT: manufacture of articles having uniform texture and strength equal along their length and cross section.
5 dwg, 1 ex