SU315401A1 - Hydraulic press for transfer pressing - Google Patents

Abstract

HYDRAULIC liPECC FOR 'TRANSFER PRESSING OF PRODUCTS FROM POLYMERIC MATTERS characterized in that, in order to eliminate the free fall of the removable matrix when lowering, the power piston, diametrically located cavities are made parallel to its axis in the rod of the latter, communicating with the rod cavity of the power cylinder, in which the plate is located Nzhery unilateral action.

Description

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Known hydraulic presses for transfer pressed1; products made of polymeric materials containing a frame of fixed upper and lower plates, a mold placed between them, a power cylinder with a piston rigidly connected with. punch mold, and the mechanism of pushing products.

However, such presses do not exclude the free fall of the removable die when lowering the power piston.

The purpose of the invention is to eliminate the noted disadvantages.

For this purpose, diametrically located cavities are made parallel to its axis in the rod of the power piston, communicating with the rod cavity of the power cylinder, in which the plungers of one-sided action are located.

Figure 1 shows the proposed press, the General view of figure 2 is a continuous section through the power cylinder; Fig. 3 is a section through the mechanisms for trimming the sprue and ejecting the matrix.

The press described is biased, i.e. contains two identical pressure columns, located in one welded frame, with fixed upper 1 and lower 2 plates, a mold 3 placed between plates 1 and 2, power cylinder 4 Mexai.j-.3M 5 cutting sprues, and mechanism 6 ejection mold molds housed in housing 7.

The body of the power cylinder 4 is attached to the plate 2 of the frame with a nut. In the rod 8 of the power piston 9 diametrically spaced cavities 10 are made, communicating with the rod cavity of the cylinder 4. In the cavity 10 there are unilateral acting plungers 11

The mold 3 consists of an upper part 12 fixed on a plate 1, a lower part .13 in which a punch (pressing rod) 14 is placed, rigidly connected to the rod 8 of cylinder 4 and dismountable-detachable matrix located between parts 12 and 13. 15.

C Khanizm 5 trim gates consists of a trimming rod 16 connected to a threaded cone stern 17 driven by

cylinder with a copier. The magnitude of the mold exit of the rod 16 is controlled by the threaded connection of the rods 16 and 17.

The ejection mechanism 6 of the matrix consists of two hollow rods 18 and 19. Two ejector rods 20 are attached to the rod 19. The ejection magnitude is also changed. The pushing of the rods 18 and 19 is also carried out. The press is provided with a loading device 20.

The press works as follows.

Heating the mold and filling it with material, supplying fluid from the high pressure pump to the lower cavity of the power cylinder. The piston 9 rises, carrying the lower half of the mold on the plunger rod 11, until both its halves close (there is always high pressure fluid in the cavity of the plungers}. After the mold is closed, the piston continues to rise, overcoming the resistance of the fluid, located in the cavity 10 and the rod end of the cylinder 4, together with the piston 9, the punch 14 begins to move, pressing the material into the cavity of the press mold. When the punch rests on the lower half of the mold, the pressing force reaches its maximum, and from this point onward, the pressurized product begins.

When the pressurized shutter end 9 expires and the plug connected to its rod 8 moves down for a distance. In this case, the plunger rods 11, abutting against the lower half of the mold, keep it in a closed state, thereby preventing the matrix from falling when trimming the sprues. The mechanism for trimming the gates, the sprue section and the press residue from the manufactured product are activated The waste further down, the punch 14 finger, secured in its shank, reveals the mold. The die at the time of opening is ejected by the ejection mechanism from the upper half of the press mold and lowered together with the lower half of the mold. Then the matrix with the product is removed from the mold, and the friend is put back into the last one and the work cycle repeats.

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Claims (1)

HYDRAULIC PRESS FOR TRANSFER PRESSING of products from polymeric materials "containing a bed with fixed upper and lower plates, a mold placed between them, a power cylinder with a piston rigidly connected to the mold punch, and an ejection mechanism, characterized in that, for the purpose of exceptions for free fall of the removable matrix when lowering the power piston, diametrically located cavities are made in the rod of the latter parallel to its axis, communicating with the rod cavity of the power cylinder, in which single acting pistons.