SU1366413A1 - Injection die for moulding articles of reinforced polymeric material - Google Patents

Description

(21) 4031611 / 23-05

(22) 03/12/86

(46; 01/15/88. Bull. No. 2

(72) V.K.Syrkin and V.N.Elesin

(53) 678.057.94 (088.8)

(56) USSR author's certificate

No. 627995, cl. B 29 C 43/12, 1977.

154) PRESS FORM FOR THE FORMATION OF PRODUCTS FROM THE REINFORCED POLYMER MATERIAL

(57; The invention relates to equipment for forming laminated shells by pressure impregnation. The purpose of the invention is to improve the accuracy of the geometric dimensions of the product. The proposed mold contains a punch 1, an elastic cover 2, a matrix 4, a ring 5 with a channel 6 for feeding the binder. The punch 1 has a channel 7 for supplying the working medium under pressure. The preform 3 is molded on the punch 1 with a cover 2 which has wafer cells 9, the jumpers of which have openings for communicating the cells 9 between themselves and with the channel 8. Feed the binder through the channel 6 and impregnate the workpiece 3 when it is evacuated.Then, through the channel 7, the working medium is fed for pressure testing, which enters the channel 8 and through the openings of Cell 9. The cell dimensions are selected based on the product size and the properties of the reinforcing material. product quality due to the accuracy of its geometric dimensions. 4 Il.

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The invention relates to equipment for the production of articles in the form of a shell made of reinforced polymeric materials, for example fiberglass, etc., by pressure impregnation.

The purpose of the invention is to improve the accuracy of the geometric dimensions of the product.

Fig. 1 shows a mold, a general view (, to the left of the axial one - in the position prior to impregnation, reinforcement of the workpiece with a binder, to the right - in the position during impregnation); figure 2 - the same, in the position at the final molding of the product by internal pressing; in FIG. 3, view A in FIG; figure 4 - node I figure 1-,

The mold contains a punch 1, on the shaping surface of which an elastic case 2 is dressed. On the punch with a cover, a workpiece 3 is installed, on which the matrix 4 is worn. Between the flanges of the punch 1 and matrix 4, a ring 5 is installed along the end face of the workpiece 3, through which it is carried out. fastening of the cover 2 to the punch 1 and removal of the finished product from the punch 1; In the ring 5, a channel 6 is made for connection to the binder supply system, and in the upper part of the die (not shown) there is a channel for connection with the vacuum system. Channel 7 and an annular channel 8 are made into the inner space of the cover 2 in the punch 1 to supply the pressing joint. Wafer cells 9 are made on the formative surface of the punch 1, the cavities of which are interconnected by holes 10 and an annular groove 8 connected to the channel 7 The wafer cells are necessary for creating an impregnating gap and for bringing the pressing medium into the interior of the cover 2. The dimensions of the cells 9. are chosen from the condition of obtaining the required dimensions of the finished product, i.e. so that the blank in the form of a polygon takes the required shape due to internal crimping. Between the cells 9, transverse bridges 11, the thickness of which is greater than the thickness of the longitudinal bridges 12, are necessary. This is necessary to create the directivity of the impregnation front along the preform, i.e., the binder fills the annular zone and then moves along the preform.

3

Mounting, centering and sealing elements are not shown.

The mold works as follows.

On the punch 1 with the elastic cover 2 and the ring 5 installed, the method of laying out and winding a reinforcing material, such as fiberglass, forms a blank 3. A die 4 is mounted and secured to the punch with the workpiece, the channel 6 is attached to the binder feed system, through channel 7 to the system for supplying the pressing medium, and through the channel in the upper part of the die (not shown) to the system for evacuating the working cavity of the mold. After that, under the total pressure of the binder and vacuuming, the workpiece is impregnated with a polymer binder (Fig. 1, to the right of the axial), while the elastic cover 2 is pressed into the cells 9 of the punch 1 to form an impregnating gap. The jumpers And 12 of the pits 9 of the punch 1, touching the cover, slightly increase the resistance of the binder during impregnation, but due to the fact that the thickness of the cross bridges 11 are longer than the longitudinal bridges 12, the impregnation front is formed along the workpiece 3, after finishing the impregnation The final co-operation of the product with internal crimping, for which through the channel, the pressing medium is fed through the channel 8 and the holes 10 into the wafer cells 9 of the punch 1 of FIG. 2), while the excess binder from the working cavity molds are extruded through channel 6,

During the internal crimping process, the blank 5 is pressed against the forming surface of the matrix 4 with its outer surface, while the reinforcing material of the blank perceives tensile loads, and the larger the widths of the cells 9 along the width, the reinforcing material is subjected to greater stretching. Therefore, in order for the polygon-shaped workpiece 3 to take the shape of the forming surface of the matrix 4 due to the internal molding, the size of the wafer cells is chosen depending on the specific product within 50-200 mm, and the diameter of the fabricated

13664

products and elastic properties of the reinforcing material.

Thus, the cell size affects the amount of pressure required (neither crimping and the formations as a result of these deformations of the reinforcing material. The mold with the workpiece is fed for curing. After the binder is hardened, the mold is split, the die 4 and with the aid of the ring 5 is carried out the removal of the product from the punch 1, and the cycle for the manufacture of products is repeated.

Thus, this technical solution 15 makes it possible to manufacture products with the required accuracy of the geometrical dimensions of the outer surface of the product,

3 Formula

the invention

A mold for molding articles made of reinforced polymeric material, containing a punch, a matrix, an elastic sheath, systems for supplying the working medium under pressure to an elastic sheath, evacuating and feeding the binder, which, in order to improve the accuracy of the geometric dimensions of the product, On the forming surface of the punch there is a channel for supplying the working medium and wafer cells, the jumpers of which have openings for connecting the cells between themselves and with the channel for supplying the working medium.

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Claims (1)

Claim A mold for molding articles made of reinforced polymeric material containing a punch, a matrix, an elastic cover, a system for supplying a working medium under pressure on an elastic cover, evacuating and supplying a binder, characterized in that, with a pillar) to increase the accuracy of the geometric dimensions of the product on the forming the surface of the punch made a channel for supplying a working medium and wafer cells, the jumpers of which have openings for communicating cells with each other and with a channel for supplying a working medium. View A fi & .A-