SU1340901A1 - Arrangement for compacting articles from metallic powders - Google Patents

Abstract

The invention relates to powder metallurgy. The purpose of the invention is to increase the productivity of the device, the durability of the tool and the reduction of the push force of the products. After powder is deposited into the forming cavity, formed by pairs of fixed and movable 15 vertical plates, they are fixed with crackers 30 when lowering the upper punch 25, which compacts the powder to a density of 75-80%. When storing the pressing force, the powder is additionally compacted to values of 25 i (L

Description

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90-96% due to its shear caused by swinging about the axis of the forming cavity of the movable pair of plates 15 together with the lower punch 13- when alternately turning on the hydraulic cylinders 5 and 6, After the extrusion process is complete and fixing the movable plates 15 together with the lower pu34090

An anson 13 is in coaxial position with an upper punch 25 and the product is extruded. Thus, this device allows to reduce the amount of movements of the punches and reduce the ejection force due to the execution of the semi-detachable die. 3 il.

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The invention relates to powder metallurgy, in particular, to devices for pressing articles from metal powders.

The purpose of the invention is to increase the pro- and water content of the device, the tool life and the reduction of the ejection force of the product,

Fig. I shows the device at the moment of the finished process of pressing the product, a longitudinal section; figure 2 - section aa in figure 1; FIG. 3 shows a sequence of transitions of the process of pressing a product.

The device comprises a housing 1 fixed on the support plate of the press 2. In the rectangular guides formed by the housing 1 and the pressure films 3, the carriage 4 is fixed with the possibility of reciprocating movement from the actuator consisting of hydraulic cylinders 5 and 6 with brushes 7 and 8 and fittings 9 and 10. In the opening of the carriage 4 a sleeve 11 is fixed, in the opening of which with the possibility of vertical reciprocating movement from the action of the pusher 12, the lower punch 13 is installed. In the landing groove of the carriage 4 there is a fixed pair of vertical A pair of plates 14, between which a pair of vertical plates 15 are pivotally installed, through fastening screws 16 which pass through the holes, serve simultaneously to limit the swing in the vertical plane of the pair of plates 15. To ensure a smooth and directional swing in the vertical plane, the pair of plates 15 rests on vibropressing support 17 ,; H.a fixed in radial bread x 18, placed on supports 19, which are attached to the carriage 4. To fixed

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A pair of plates 14 is attached to a hydraulic cylinder 20 with fittings 21 and 22, a piston 23 and a brace 24 securing the coaxial position of the lower 13 and upper 25 of the punch through a hole in the clamping bar 3. A punch holder 27 is attached to the upper support plate of the press 26, the upper punch 25 is installed in its hole, fixed from turning by the keys 28. In the lower part of the punch holder 27 there are fixed upper supports 29 with radius 30, which provide a base for a pair of vertical plates 15 relative to the upper pu -. anson 25.

The operation of the device for the pressing of products from metal poros is carried out in the following manner.

First transition. Powder filling in the mold. The upper support plate of the slider of the press 26 with the punch holder 27 attached to it, in the opening of which the upper punch 25 is installed, with the upper supports 29 and the radius crackers 30 is in the upper retracted position. In hydraulic cylinders 5 and 6, there is no hydraulic pressure on the rods 7 and 8. The pusher 12 lower punch 13 is retracted to the lower position. Through the nozzle 21, a hydraulic pressure is supplied to the non-rod cavity of the hydraulic cylinder 20, which, by displacing the piston 23, with a rod lock .-. 24, through the hole of the clamping plate 3j fixes the coaxial position of the upper and lower punches 25 and 13.

Second transition. The upper support plate of the slider of the press 26 lowers the punch holder 27 with the upper punch 25 and the radius with thrus 30 and fixes a pair of plates 15.

The third transition. The upper punch 25, moving downwards, compacts the powder to a density of 75-80%, which, when compacted, adheres to a pair of plates 15, draws them down, but the latter, resting on the vibrating supports 17, return to their original position; this process, which is vibrating, greatly helps the compaction of the powder to a density of 75-80%. At the last moment of the vertical stroke of the punch 25, the pin holder 24 is pulled out of the hole in the bar 3 by moving the hydraulic circuit 23 by supplying hydraulic pressure through the fitting 22 to the rod cavity of the hydraulic cylinder 20.

Fourth and fifth transitions. With

maintaining the pressing force of the upper 20 devices with a split matrix and

hydraulic punch 25 is alternately supplied with hydraulic pressure through fitting 9 and 10 into hydraulic cylinders 5 and 6, the rods 7 and 8 of which move along the rectangular guides of the housing 1 the carriage 4 with the lower punch 13 to the left and right by an amount of 1.2-1.5 mm, thus swinging a pair of plates 15, which leads to compaction of the powder to a density of 90-96% by relatively shifting the powder particles without increasing the pressing force of the upper punch 25. After making a double stroke (left and right) of the carriage 4, the hydraulic pressure is relieved from the hydraulic cylinders 5 and 6.

Sixth transition. Through the fitting 21, a hydraulic pressure is supplied to the non-rod cavity of the hydraulic cylinder 20, which moves the piston 23 with the pin holder 24 through the opening of the clamping bar 3, fixes the carriage 4 to the coaxial position of the upper and lower punches 25 and 13.

Seventh transition. The upper support plate of the press 26 lifts the punch holder 27 with the upper punch 25 and the radius crackers 30, unlocking a pair of plates 15.

The eighth transition. The pusher 12 moves upward and pushes the pressed product out of the working zone of the die through the lower punch 13.

Ninth transition. The pusher 12 moves downward, carrying the lower punch 13 into the working area.

matrix, then the whole pressing cycle is repeated.

The use of the invention allows to increase the productivity and durability of the tool by reducing the magnitude of the movement of the upper and lower punches and to reduce the pushing force of the pressed product due to the fact that the die is made semi-detachable, while maintaining the advantages

devices for pressing products by the method of relative shear of the powder particles, which provide for the removal of a significant pressing force as compared with the method of direct pressing.

Claims (1)

Invention Formula A device for pressing products from metal powders, comprising a housing, punches and a die consisting of a movable driven bowl and a fixed part, in contrast to the fact that, in order to increase device performance, tool life and reduction of the force of ejection of the product, it is equipped with vibration-supporting supports, and the fixed and movable parts of the matrix They are made in the form of pairs of vertical plates that are hinged together and form a closed forming cavity, while the movable part of the matrix is mounted on vibration-supporting supports with the possibility of vertical movement and oscillation together with the lower punch relative to the central axis of the cavity. Sequence of transitions of the process of reviewing FIG 3 Compiled by A.Naimushin Editor M.Tovtin Tehred M.KhodanychAcorrector A. Tsko Order 4383/16 Circulation 740 Subscription VNIIGSH State Committee-USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Proekna str., 4