SU1360898A1 - Injection mould for compacting articles from powder - Google Patents

Abstract

The invention relates to molds for pressing articles from metal powder. The goal is to simplify the design of the mold. At the initial moment, the punch 1 with the elastic partition 8 and the punch 2 occupy the uppermost position. When this powder from the hopper through the inclined holes 17 enters a closed (L with 05 about with 00/3

Description

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the cavity formed by the punch 2 and the partition 8. Then it is turned on when the water of the upper punch, which, together with the elastic partition 8, is moved to the lowest position, pressed the powder and at the same time overlapped the side openings 17 of the punch with the side surfaces deflection, takes the form of the working surface 6 of the punch 1 (parabolic shape). Then the punch 1 with the partition 8 is returned to the extreme upper position, opening the loading openings 17,

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The invention relates to powder metallurgy, in particular to press molds for pressing articles from metal powder.

The aim of the invention is to simplify the design of the mold.

FIG. 1 shows schematically the proposed mold

The view (on the left side shows the relative position of the elements of the mold before pressing, and on the right side - at the final moment of pressing) i in FIG. 2 shows section A-A in FIG. one.

The mold contains the upper 1 and lower 2 punches, a split matrix consisting of the upper 3 and lower 4 parts interconnected by studs 5. On the working surface 6 of the punch 1, made in the shape of a parabola, in its central part with a screw 7, the partition wall 8 is rigidly fixed to one another, made, for example, of spring steel, the ends of which are installed in grooves 9 made in the walls of a split matrix with the possibility of reciprocating movement.

In the lower part of the mold, a block 11c is installed in the guides 10 with the possibility of reciprocating motion by means of matrices 12 and 13, which are alternately in contact with part 4 of the matrix.

which a new portion of the powder enters the cavity of the matrix. Thereafter, the pressing cycle is repeated, and after each cycle, the punch 2 is lowered by a predetermined amount until the cavity 11 is filled with material. After that, the block 11 is moved to the ejection position of the workpiece and the die 13 is fed into the pressing area. After the extruded billet is ejected, the overall pressing cycle is repeated. Thus, the application of the proposed device allows to simplify the design of the mold. 2 Il.

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Block 11 and punches 1 and 2 are connected by rods 14-16, respectively, with hydraulic cylinders (not shown). For filing the powder into a split matrix, inclined holes 17 are provided, which are formed in its walls.

The mold works as follows.

At the initial moment, the punch 1 with the elastic partition 8 and the punch 2 occupy the extreme upper position (Fig. 1, left side). When this powder from the hopper (not shown) through the open at this moment inclined holes 17 enters the closed cavity of the split matrix, obra-. bathroom punch 2 and partition 8.

Then the drive of the upper punch is turned on, which, together with the elastic partition (tape) 8, moves to the lower extreme position, compresses the powder and simultaneously overlaps the loading holes 17 by the side surfaces of the punch. At the same time, the partition 8, deflection, takes the form of the working surface 6 of the punch 1 (parabolic shape).

Then, the punch 1 with the partition 8 is returned to the extreme upper position, opening the loading openings 17, through which a new portion of the powder enters the cavity of the matrix.

Thereafter, the cycle is repeated, and after each subsequent cycle, the punch 2 is lowered by a predetermined amount of stroke determined by the force on the punch 2 from the hydraulic cylinder.

Repetition of the described pressing cycles is carried out until the matrix 12 (block 11) is completely filled with material after which the cylinder 14 moves the block 14 in the guides 10 from the hydraulic cylinder, thus cutting the monolith of the pressed blank in plane B, removing the matrix 12 with the blank in the ejection zone and the simultaneous supply of the die 13 to the pressing zone. Then the pressed billet is pushed by the punch 2 from the hydraulic cylinder.

Thereafter, the overall pressing cycle is repeated. Consequently, making a unit for compacting the powder in the form of an elastic band rigidly fixed in the central part of the working surface of the upper punch, the ends of which are installed in grooves made in the walls of the matrix with the possibility of reciprocating movement, reduces the number of interconnected movable elements constituting the sealing unit, and the execution of the press

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The tapering surface of the punch no 5r6pMe of the parabola results in high quality blanks by approximating the shape of the pressing surface of the punch to the density distribution curve over the cross section of the blank, which ensures the pressing of the central part of the blank.

Thus, the use of the proposed mold allows to simplify the design and, consequently, reduce the cost of its manufacture, on average, by 25-30%.

Claims (1)

Invention Formula . A mold for pressing products from powder, containing a matrix, upper and lower punches, and a partition made of elastic material, installed between the punches, characterized in that, in order to simplify the design, the die is made with radial slots in its walls, and the partition is installed in the matrix grooves with the possibility of reciprocating movement and rigidly connected with the working surface of the upper punch in its central part, while the working surface of the upper punch is made parabolic. 9ttiZ Compiled by I.Kynsky Editor G.Gerber Tehred M.Hodanich Corrector M.Sharoshi Order 6180/16 Circulation 741 Subscription VNIIPI USSR State Committee. for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. 4/5 Production and printing company, Uzhgorod, st. Project, 4