SU1214305A1 - Die for flashless pressing - Google Patents

Description

one

The invention relates to the processing of metals by pressure, in particular to the stamping of metals in detachable semi-matrices, and can be used for single-layer stamping of parts.

The purpose of the invention is to improve the quality of the products and durability of the tool.

Fig. 1 shows schematically the proposed stamp, the open position before stamping; 2 - the same, - the initial stage of the turn of the sleeves (left half) and the final stage of the stamping (the right half).

The stamp comprises an upper plate 1, a lower plate 2 and an intermediate plate 3, which is also a lower semi-matrix. An upper half-matrix with a bandage 5 is mounted on the top plate 1 for movement relative to it. An elastic element 6 is located between the top plate 1 and the bandage 5, for example a ring of polyurethane. Intermediate plate - semi-matrix 3 is installed on the bottom plate 2 by means of springs 7 and bolts 8. On the intermediate plate there are fixed pushers 9 located symmetrically relative to the axis of the semi-matrix 3, - The punch consists of 10 outer and 11 inner parts installed respectively on outer 12 and inner 13 plungers that are placed in the cylinder 14 mounted on the bottom plate 2. Both parts of the punch 10 and 11 are fixed on the outer 12 and inner 13 plungers using a support nut 15 and shoulders on the lower ends of both parts of the punch. Between the cylinder 14 and the plungers 12 and 13 there is a material that is characterized by sufficient viscosity so as not to leak into the gaps between the plungers, as well as good elastic-plastic properties, such as a disk 16 made of polyurethane. On the top plate is located the ejector 17.

The stamp works in the following way.

The heated billet is placed in the cavity of the lower half-matrix 3 on the punch, after which the press stroke starts down. Hemacrites 3 and 4 O1ykayuts. Both parts of the punch act on the workpiece, having made its initial shape changes, moving with respect to the floor of the matrix 3 with the cv of the alternate speed 1 3052

tew. () Dinako and the speed of both parts of the punch and the initial moment of stamping is achieved by the fact that the ratio of the areas of the outer part

The 5 10 punch at its working end to the pitch of the outer plunger 12 at its lower end, resting on the polyurethane disk 16, is equal to the ratio of the area of the inner part 11 of the punch 10 to the area of the inner plunger 13 at its end. The face burr is not formed (i.e., in the initial change of deformation) due to a slight strain of the strain (5 povka.

In the long run of the press crawl down, the pushers 9 begin to interact on one side through the support nut 15 with the outer plunger 1i, and on the other side with the upper half-matrix band 5 5. Starting from this moment, the suction plunger 12 moves together with the pushers 9, moreover, if nat g between gang

25, pulp 5 and semi-matrix 4 are within the optimum design value, then the elastic element 6, which is between the upper plate 1 and the band 5, is not (1 is curbed 5 so

as the force of the pushers 9 is not enough to move the band 5 along the half-matrix 4, thereby increasing the tension on the half-matrix. In this case, the outer part 10 of the punch, not moving relative to the half-matrix 3, moves with it downwards, acting on the plunger 12 and through it on the polyurethane disk 16. The polyurethane transfers pressure through the plunger 13 to the inner part 11 of the punch, which, moving inside the closed cavity of semi-matrix 4 and 3, makes the final shaping of the workpiece. The face burr on the workpiece from the action side does not form a punch. No burrs form between the inner 11 and outer 10 parts of the punch because the friction force between the workpiece material and the surface of the inner part 11 of the punch material moves from the gap. In this case, the gap between the outer part 10 of the punch and the crawl, matt, ity 3 is practically non-flowing, since the angles refer to one or 1-1 of the goats of engravable elements of the engraving, In this case, when nat between half matrix 4 and gang

The pulp 5 weakens due to the creeping reasons of the material of the band 5, the latter is pressed more strongly onto the semi-matrix 4 under the influence of the pushers Y until the calculated tension value is compressed, while compressing the elastic element 6. The main purpose of the elastic element 6 is to prevent excessively strong pressing banding on the matrix in the case of sharp one-time increases in the efforts of stamping on the punch, for example, as a result of under heating of the workpiece or a larger volume of the workpiece. In this case, most of the excess force is absorbed by the elastic element 6. Springs 7. raise the intermediate plate - half-matrix 3 to the initial position and raise the half-matrix one to another during punching, and bolts 8 limit the rise of the plate 3 in the initial position. Pushers 9 are installed with a gap in the bores of the plate 3 symmetrically with respect to the axis of the half-matrix. Their downward movement is limited by the shoulder on the pushers, and the upward movement relative to the plate 3 when interacting with the support nut 15 is unlimited. The stamped billet of the vypak is ia-pusher 17 when the slider is raised to its original position. Connection

143054

the outer part 10 of the punch by means of the pushers 9 in the final stage of the working stroke, i.e. At the moment of the most intensive formation of 5 burrs, the outer part of the punch does not move relative to the half-matrix, only the inner part tt of the punch moves and deforms the metal. it

10 leads to a drastic reduction in the formation of face burrs and even its complete elimination with proper selection of the magnitude of the stroke of both parts of the punch during the preliminary

15, the deformations of the workpiece, i.e., the part of the stroke, until the pushers 9 had not yet entered: they drank into contact with the support nut 15 and both parts of the punch moved relative to the half-matt20, and they moved at the same speed, and by the same amount. In addition, the operation of pushers 9 with an external plunger and band 5 during the working stroke stabilizes the amount of tension between the band 5 and the half matrix 4. When the tension is loosened by the creep of the tension band metal and, consequently, the compressive stresses The JQ ™ mat matrices are restored during operation, due to the additional pressing of the band on the die.

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FIG. 2

Compiled by K. Beschekov Editor S. Lisina Tehred T. DuP-Inchak Proofreader V. Sinitska

Order 825/16 Circulation 656Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, ,, Raushsk nab., 4/5

Branch PIP Patent, GoUgorod, ul "Project,

Claims (3)

1. A stamp for a trouble-free stamping, comprising the upper, lower and intermediate plates, two half-matrixes, the upper of which with a bandage mounted on the upper plate, and the lower one on the intermediate plate, as well as two coaxially mounted outer and inner punches resting on the lower plate by two plungers placed in its hollow cavity with a bottom, which is characterized in that, in order to improve the quality of the products obtained and the tool life, it is equipped with an elastic element, as well as pushers mounted on an intermediate plate with the possibility of interaction with the outer punch and the bandage of the upper half-matrix, the latter being placed on the top plate with the possibility of reciprocating movement in the direction of the axis of the stamp, and the elastic element is installed between the top plate and the bandage. 2. The stamp according to claim 1, the clue is that the ratio of the area of the working surfaces of the punches to the working areas of each plunger are equal to each other. 3. The stamp according to claim 1, with the fact that in the cavity of the bottom plate from the side of its bottom there is a polyurethane element with a diameter equal to the diameter of the bottom of the cavity. ; _(W , SU „„ 1214305