SU1215864A1 - Injection mould for pressing articles of powders - Google Patents

Description

The invention relates to powder metallurgy, in particular, to press molds for pressing of articles of complex shape from metal powders. The aim of the invention is to increase the yield and decrease the quality of the surface of workpieces of complex shape.

FIG. a diagram of the mold at the moment of the start of pressing is shown; in fig. 2 - the same, at the time of extrusion; in fig. 3 and 4 - separate stages of mold pressing; in fig. 5 - 8 - types of products obtained in the proposed mold.

The mold consists of the upper 1 and lower 2 punches, the die 3, - insert 4, the transverse punch 5 with the spring 6, the spring 7 and the stop 8.

The matrix 3 is made with an output cone 15-30 to a height of 1.5-2 of the height of the part and with a groove providing movement of the insert 4 as well as a guiding profiled groove 9 for movement of the transverse punch 5.

The insert 4, on the one hand, is a continuation of the inner surface of the die, on the other hand, has a protrusion that repeats the shape of the groove of the die 3 and provides mating of parts along a sliding fit, a cavity for accommodating the punch 5 and attaching the spring 6 and the through hole Sne shown). Spring 7 provides the return of the insert 4 until it stops B.

The transverse punch 5 is formed with a forming part, which provides the profile of the workpiece, and an end face abutting against the guide profiled groove 9 of the die 3.

The work of the mold is in follow up.

Powder is poured into the cavity of the die 3, then a punch 1 is introduced into the die and the opposing movement of the punches 1 and 2 is the process of pressing the preform. At this, on the side surface of the workpiece. : formed surface elements (in particular, holes) corresponding to the geometry of the transverse punch 5 During the extrusion process, the transverse punch does not experience significant bending forces due to the floating state of the matrix 3 and the slide 4

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The ejection of the workpiece is carried out by moving the punch 2 upwards, while together with it the insert 4 moves with the transverse punch 5.

When moving up, the billet enters the output cone 15-30, starting at a distance of 1.5-2 the height of the billet from the top edge of the matrix. Availability of output cone with

an angle of 15-30 is necessary to ensure the extrusion of the part without the formation of transverse bundles on it, and the beginning of it at a specified depth

provides an increase in the size of the press fitting, resulting from the action of elastic forces of the aftereffect. At a distance of 0.9-1.0, the height of the workpiece from the upper edge of the matrix is elastic

the after-effect of the workpiece reaches such dimensions that it releases the transverse punch 5. Under the action of the spring 6, it begins to move into the recess of the profiled groove 9

matrix 3, starting at a distance of 0.9-1.0 of the height of the workpiece from the upper edge of the matrix.

The insert 4 together with the punch 5 under the action of the spring 7 moves up to the stop 8 to the lower initial position, with this punch 5 stubborn, the end slides along the guide slot of the matrix. Next, the extruded billet is removed from the die, the punches 2 and 5 are moved to the initial position, and the pressing cycle is repeated.

The use of the proposed mold allows to manufacture blanks with recesses, grooves and holes in the conditions of small-scale and mass production.

The use of the proposed mold allows to increase the yield and to improve the surface quality of the pressed blanks by removing the transverse punch from the blank after it is removed from the die. So, when pressing products

complex shape in the amount of 200 scht all products are recognized as fit (yield of 100%), and their surface has no delaminations, cracks and chips. When using the famous proc. the shape of the yield does not exceed 97%, and on the surface of some products there are chipped (in the area of the side punch).

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fg / g4

cpt / g.y

Editor N. Egorova

Srstavitep I. Kinsky

Tehred O. Niece, Proofreader V. But

Order 935/12 Circulation 757 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Branch PPI Patent, Uzhgorod, st. Project, 4

FS / gb

FIG. 7

Claims (1)

PRESS FORM FOR PRESSING PRODUCTS OF POWDERS of predominantly complex shape, containing a matrix with an output cone, upper and lower punches, side punches installed with the possibility of movement in. direction perpendicular to the pressing axis, and return springs, characterized in that, in order to increase the yield and improve the surface quality of the products, the matrix is equipped with inserts made with through holes and cavities, grooves are made on the inner surface of the matrix parallel to its longitudinal axis, while the lateral punches and return springs are installed in the cavities of the inserts coaxially with through holes, and each insert is located in the grooves of the matrix with the possibility of axial movement. > I 215864