RU2469847C1 - Die mould for manufacture of reinforced rubber technical goods - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention can be used for manufacture of elastic support hinges (ESH) of nozzle blocks of solid-propellant rocket engines (SPRE). Die mould for manufacture of reinforced rubber technical goods with layer-by-layer located reinforcement elements and layers of elastomer includes upper and lower semi-moulds, and upper and lower forming rings, as well as fasteners of reinforcement elements. Upper and lower hold-down rings rigidly attached to the corresponding moulding rings are installed opposite fasteners of reinforcement elements. One hold-down ring is equipped with screws screwed into threaded through holes open in that ring against the stop into fasteners of reinforcement elements. Through slots for passage of elastomer to reinforcement elements are made in the other hold-down ring.

EFFECT: number of die moulds of the design as per the described invention has been developed by the enterprise, where high-quality ESH of nozzle blocks with various dimensions are manufactured and the required manufacturability is provided.

4 dwg

Description

The invention relates to the field of engineering, in particular to the technology of manufacturing reinforced rubber products by vulcanization in a mold, and can be used to produce elastic supporting hinges (EOS) of nozzle blocks of solid propellant rocket engines (RTTT).

Known molds for the manufacture of rubber products, including a loading chamber and a forming unit (see, for example, I.M. Bulanov, V.V. Vorobey. Technology of rocket and aerospace structures from composite materials. - M.: Publishing House of MGTU im. N.E.Bauman, 1998 - p. 156-159, 165-167).

In addition, molds are known for the manufacture of reinforced rubber products with floor-mounted reinforcement elements and elastomer layers containing upper and lower half-molds, upper and lower forming rings, reinforcing element latches (see, for example, RF patents Nos. 2,113,998 and 2,351,472).

In these molds, it is difficult to control the position of the clamps relative to the reinforcement elements after closing the upper and lower forming rings.

Also known is a mold for the manufacture of reinforced rubber products with floor-mounted reinforcement elements and elastomer layers, containing upper and lower half-molds, upper and lower forming rings, reinforcing element clamps (RF patent No. 2302944), the closest analogue.

After assembly in this mold, it is possible to visually or using a measuring tool to control the presence and size of the gaps between the ends of the grooves of the clamps and the ends of the elements of the fittings located in the grooves of the clamps.

However, in the known mold, the assembly exhibition of the clamps in the set position is provided only by the structural dimensions of the mold elements, mainly the upper and lower forming rings, while the position of the clamps relative to the reinforcement elements is not further regulated.

If the values of the gaps deviate from the structurally specified molds are disassembled and after eliminating the reasons for the deviation, reassembly is performed, which increases the complexity of the process of preparing the mold for molding the product.

In addition, since during the molding process, the clamps of the reinforcing elements are subjected to significant loads from the side of the elastomer, when it is pressed into the gaps between the reinforcing elements, the known construction of the mold does not exclude the possibility of moving the clamps during molding relative to the initial position.

The movement of the clamps during the molding process leads to a deviation of the gaps between the reinforcing elements from the structurally specified ones, which is not permissible for the EOS of the nozzle blocks of solid propellant rocket motors, since the performance deteriorates and the reliability of the product decreases.

These shortcomings lead to a decrease in the quality of manufacturing reinforced rubber products with floor-mounted reinforcement elements and elastomer layers in a known mold.

The technical task of this invention is to improve the manufacturing quality of reinforced rubber products with floor-mounted reinforcement elements and elastomer layers by increasing the accuracy of the exhibition of gaps between the reinforcing elements by adjusting the position of the clamps relative to the reinforcement elements during the assembly process and eliminating the possibility of moving the clamps relative to the initial position during molding .

The technical result is achieved by the fact that in the mold for the manufacture of reinforced rubber products with floor-mounted reinforcement elements and elastomer layers containing upper and lower half-molds, upper and lower forming rings, reinforcing element latches, upper and lower pressure rings are installed opposite the reinforcing element latches rigidly fastened with the corresponding forming rings, while one clamping ring is equipped with screws that are screwed into the through holes open in this ring threaded holes in the clips up to the stop valve elements and the other pressure ring is provided with through slots for the passage of the elastomer to the reinforcement elements.

Installation opposite the clamps of the reinforcing elements of the upper and lower clamping rings, rigidly fastened to the corresponding forming rings, eliminates the possibility of moving the clamps of the reinforcing elements during molding relative to the initial position.

The supply of one clamping ring with screws screwed into the through threaded holes open in this ring until the stop in the clamps of the reinforcement elements allows you to adjust the position of the clamps relative to the reinforcement elements during the assembly of the mold and ensure that the clamps are accurately exposed in the required position, eliminating deviations of the gaps between the elements fittings from structurally specified.

The implementation of through grooves in the other clamping ring for the elastomer to pass to the reinforcement elements can significantly reduce the load on the upper clamps during pressing and thereby completely eliminate the possibility of displacement of the clamps from the required position, which provides a given gap between the reinforcement elements.

Figure 1 shows the layout diagram of the mold.

Figure 2 shows the design of the molding block of the mold.

Figure 3 shows the design of the molding block of the mold with tightened clamps of reinforcing elements.

The mold for the manufacture of reinforced rubber products contains the upper half-mold 1, the lower half-mold 2 and the forming block, including the upper forming ring 3, the lower forming ring 4 and the clamps 5 and 6 of the reinforcement elements of the product, including metal support rings 7, 8 and metal plates 9 .

The latches 5 and 6 are made in the form of a rigid rail with teeth driven between the elements of the reinforcement 7.

The number of clips 5 and 6, installed evenly around the perimeter, is determined by the dimensions of the product.

An annular loading chamber 10 is made in the lower half-mold 2, from which the elastomer 11 is pressed between the reinforcement elements of the product.

Opposite the clamps 5 of the reinforcement elements 7, the upper clamping ring 12 is installed, and opposite the clamps 6 of the reinforcement elements, the lower clamping ring 13 is installed.

The clamping rings 12 and 13 are rigidly fastened, respectively, with the upper forming ring 3 and the lower forming ring 4.

In the lower clamping ring 13 there are made threaded holes 14 into which screws 15 are screwed, two for each fixture 6 of reinforcement elements.

In the upper clamping ring 12, through grooves 16 are made for the elastomer 11 to pass to the reinforcement elements.

Preparation of the mold for work is as follows.

The mold block is pre-assembled from the upper forming ring 3, the lower forming ring 4, with the support rings 7, 8 and plates 9 installed in them, the gaps between which are set using the clips 5 and 6.

The latches 5 and 6 are installed evenly around the perimeter in an amount up to 30 pieces, depending on the dimensions of the product.

Moreover, between the ends of the plates 9 and the surface of the depressions between the teeth of the retainers 6 there is a gap "δ".

The upper clamping ring 12 and the lower clamping ring 13 are rigidly fastened to the upper forming ring 3 and the lower forming ring 4, respectively.

Install the screws 15 into the holes 14 and tighten the screws 15 sequentially each of the clamps 6 of the reinforcement elements, adjusting the position of the clamps 6 relative to the ends of the plates 9 to expose the clamps 6 in the desired position.

The latches 6 are moved relative to the inner surface of the lower clamping ring 13 by a value of "l" (see figure 3).

Moreover, the gap between the ends of the plates 9 and the surface of the depressions between the teeth of the retainers 6 is reduced from the value of "δ" to the desired value of "δ ₁ ".

The work of the mold is as follows.

An elastomer 11 is placed in the loading chamber 10, a forming unit is attached to the upper half-mold 1 and moved along the walls of the loading chamber 10, while the elastomer 11 is pressed into the product gaps, which enter through the grooves 16 in the upper clamping ring 12 and the grooves in the clips 5.

The output of the elastomer 11 is through the grooves in the retainers 6 and the grooves in the lower forming ring 4.

At the same time, the preloading of the clamps of the reinforcement elements ensures the necessary rigidity of the set of reinforcement elements of the product in the tangential direction when pressing the elastomer.

The company has developed a number of molds of the proposed design, in which high-quality EOSH of nozzle blocks of various sizes are manufactured, while ensuring the required manufacturability.

Claims (1)

A mold for the manufacture of reinforced rubber products with floor-mounted reinforcement elements and elastomer layers, containing upper and lower half-molds, upper and lower forming rings, reinforcing element latches, characterized in that the upper and lower pressure rings are rigidly fastened opposite the reinforcing element latches with corresponding forming rings, while one clamping ring is equipped with screws that are screwed into the through threaded holes open in this ring for clamps in abutment elements armature, and the other pressure ring is provided with through slots for the passage of the elastomer to the reinforcement elements.

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