SU1219392A2 - Press mould for casting machines and presses - Google Patents

Description

The invention relates to devices for processing plastic materials into products by an injection molding motorhode, in particular, to molds, and can also be used in the manufacture of products from paste-like masses and powders with flow properties in the food and other processing areas of industry, and is an improvement on a known mold according to the author. St. No. 1123862.

The aim of the invention is the expansion of technological capabilities by ensuring the use of universal presses with one working pressure.

The drawing shows the proposed mold.

The mold contains a molding chamber in the form of a hollow ring formed by the outer case 1, the divider 2 and the base 3. The base 3 is made in the form of a flange with a central hollow sleeve, in the lower part of which a support platform 4 is installed on the thread screwed together, and splitter 2 secured with screws 5. There may be other types of connections. In the lower part of the casting chamber, an injection press washer 6 is installed, resting in the initial position on the shoulder of the base. A pressurized annular cavity 7 is formed under the injection press washer in the base 3, in which a compressed working fluid is placed, which has potential energy to move the press washer and load the press material into the mold. Cylindrical and flat metal springs, gases and liquids injected into the cavity under pressure can be used as working bodies.

A matrix holder 8 is installed in the central bushing of the base, which is simultaneously the housing of the elastic compensator, which contains two compartments, of which the top is closed by a ring 9 with screws 10 and a piston 11, and the volume of the compartment is filled with working fluid 12, which can be used as substances with flow properties are used, for example, liquid 19392

bones, gases, rubber, powders, etc. The upper compartment is connected with the lower compartment channel. Plate 13 and 5 spring 14 are installed in the lower compartment, and it is closed with a claw 15 with screws 16.

The die holder is mounted on the spring 17, and a nest is formed in its upper part for the lower polynomial 10 NINKI forms — the matrix 18. The upper half of the paunson-form 19 is fastened with a guide clamp 20 to the closing plunger 21. On the mold divider, 15 charging nipples 22 are installed A press valve 23 is installed in the case of the injection chamber under the injection press washer to load the injection molding material into the injection molding chamber. A valve 20 is supplied through the working fluid, for example, compressed gas or pressurized liquid.

The design of the mold can be made in various versions - 25 ta. For example, the working fluid may be pumped to the required pressure sufficient to fully produce the press material 24 of the workpiece. At the same time, as the press material 30 is produced, the pressure under the injection press washer decreases.

It is also possible to provide constant pressure on the press washer by connecting valve 23, for example, with a compressed air cylinder or with a hydraulic multiplier.

In both cases, the press material is under pressure throughout the process.

In addition, it is possible to give pressure under the injection washer during the filling of the mold with the press material and to drop it during punching, when an excess of the press material is extruded from the mold into the casting chamber.

The preparation of the mold for operation is as follows. .

Through the charging nipple 22 or -n, into the cover-divider 2, the casting chamber is filled with press material 24. Then, the casting chamber is sealed and, through valve 23, the cavity 7 under the press-washer 6 is filled with an elastically compressed working fluid.

35

40

50

55

Mold is ready to go.

The mold works as follows.

in the initial position, the casting chamber is loaded with a press material under pressure of an elastically compressed body placed in cavity 7 under the forcing press washer 6, the mold is open, the matrix holder 8 under the action of the spring 17 occupies the extreme inoperative position and with its outer surface covers annular sprue channel. STA 13 under the action of the spring 14 is in its extreme upper position and closes the channel connecting the lower and upper cavities in the matrix holder 8, preventing the flow of working fluid 12 from the upper cavity to the lower one.

Pressure is applied to the closing plunger 21. The guide clamp 20 enters the die guide hole and abuts the piston 11. Since the load capacity of the elastic compensator is higher than the load capacity of the springs 17, the matrix holder 8 moves down until it is with the children pad 4.. Stop closing plunger. In this case, the matrix holder releases the gating channel and the incompletely closed halves of the form become opposite to it. The press material under pressure of an elastic compressed body fills the mold cavity.

After filling the mold cavity, pressure is applied to the closing plunger. In this case, the guide 20 is fixed, I act through the piston | 1, it will impose on the working body 12, which, in turn, through the channel presses

19392

on the plate 13 and the spring 14, pressing it down. The working body 12 flows through the channel from the upper cavity to the lower one, and the halves of the mold 5 approach each other, squeezing the excess of the press material from the cavity into the injection chamber. When the halves of the mold are closed, complete molding and separation of the product from the press material takes place. The piston 11, the working body 12 and the plate 13 occupy its second extreme position, the spring 14 is compressed.

Return the closing plunger to its original position. During the return stroke, the pressure. From the piston 11 from the side of the closing plunger is removed, since the working fluid 12 does not have time to flow into the upper cavity and return it to the original

ten

15

20

the position, and the matrix holder 8 is no longer held by the elastic compensator, but is only under the action of the spring 17, which, by continuously pressing the matrix holder to the closing plunger at its lifting speed, pushes the matrix holder to its original position. The passage is a gate channel, the mold halves are in a closed position. After reaching the shoulders made in the central bushing of the base 3, the lid 15 abuts against them and the matrix holder stops in the initial position. Closing plunger continues to move and opens the form. Remove the product. The working fluid by the action of the spring 14 returns to its original position. The mold is ready for the next press cycle.

Claims (1)

PRESS FORM FOR INJECTION MACHINES AND PRESS by ed. St. No. 1 123862, characterized in that, in order to expand technological capabilities by ensuring the use of universal presses with one working pressure, the injection chamber under the injection press washer is made with a cavity and is equipped with an elastically compressed working fluid placed in it .. SU ... 1219392