Compression moulding under special conditions, e.g. vacuum (B29C43/56)

ethod of making articles from polytetrafluoroethylene based composite materials // 2603673
FIELD: materials science.SUBSTANCE: invention relates to materials science, particularly to polytetrafluoroethylene based polymer composite materials production methods, and can be used for production of metal-polymer friction units workpieces and parts. Disclosed is method of making articles from polytetrafluoroethylene based polymer composite materials, whereby performing components mixing with polytetrafluoroethylene, workpieces cold pressing and following sintering, whereby before workpiece sintering, without extracting from mold is subjected to preliminary compression pressure within 0.2-0.5 MPa, pressed workpieces sintering is carried out directly in mold, at temperature of 355-365 C.EFFECT: improving sintered composite material mechanical and tribotechnical properties characteristics, as well as simplification and reducing labor intensiveness of tooling manufacturing and production of articles from polymer composite materials.3 cl, 2 dwg, 1 tbl

ethod of moulding components from polymer composite materials with application of double vacuum pack // 2579380
FIELD: chemistry.SUBSTANCE: method moulding components from polymer composite materials with application of double vacuum pack by invention relates to category of processes of resin transfer moulding (RTM), in particular to processes of soaking with liquid binding agent by means of vacuum (VaRTM). Invention can be applied in modern field of machine building, in particular in aircraft industry, in the processes of moulding of large-sized panels of bypass-forming aggregates from polymeric composite materials (PCM). Technical result of claimed invention consists in transfer moulding of components from PCM, which ensures increase of product quality and extension of technological abilities of this method due to application of double vacuum pack, and excludes appearance of pores because of residual air inclusions in preform. Method of moulding components from polymer composite materials includes placement of preform rigging with hermetic sealing of internal vacuum pack, hermetic fastening of external vacuum pack, vacuum is created and supported in both packs, components are soaked and moulded. Under the internal pack vacuum is set at maximal level (not lower than -0.98 bar), for quality soaking and more equal distribution of binding agent. Under the internal pack level of vacuum is set in the range from -0.5 bar to -0.90 bar. In the process of soaking temperature of technological rigging is smoothly increased, ensuring constant viscosity of binding agent, stabilising thereby speed of soaking. Then level of vacuum is increased under external pack to -0.98 bar. The process of gel formation of binding agent is carried out at temperature lower than temperature of complete hardening, which reduces value of volume and temperature shrinkage of binding agent.EFFECT: vacuum level under external pack in the process of soaking is set at necessary level from condition of realisation of specified volume content of binding agent in PCM after moulding, with obtaining different volume content of binding agent and different thickness of component with the similar structure of preform.6 dwg

ethod to manufacture items from polymer composite materials based on polytetrafluorethylene and device for manufacturing of items // 2546161
FIELD: technological processes.SUBSTANCE: invention relates to the field of material science, in particular, to anti-friction polymer composite materials, and may be used in manufacturing of parts of metal-polymer friction units and in general machines of various types of equipment. The method to manufacture items from polymer composite materials on the basis of polytetrafluorethylene consists in the fact that fillers are mixed with polytetrafluorethylene in a mixer with rotation frequency of 2800 min-1, and cold pressing is carried out in a closed die mould. Then the pressed stock is installed into the closed device, and additional pressure of compression is developed in the pressing direction. Besides, the additional pressure of compression is regulated and set within 2.0 - 8.0 MPa.EFFECT: increased characteristics of mechanical and tribotechnical properties of a composite material based on polytetrafluorethylene.1 tbl, 1 dwg

Fabrication of shaped article by low-pressure moulding // 2535711
FIELD: machine building.SUBSTANCE: method of production of shaped article from unordered mat containing carbon fibre strands with mean length of fibre strands of 5-100 mm, and thermoplastic polymer. Said fibre strands are impregnated at heating and comprises of mat before or after placing in the mould. Production of definite unordered mat is executed by its impregnation with thermoplastic polymer, compaction of said mat in metal mould at 0.1-20 MPa and withdrawal unordered mat from metal mould. Large and complex shaped article is produced by moulding at low pressure in compliance with this invention.EFFECT: simplified process.13 cl, 5 dwg, 2 tbl, 7 ex

ethod of preparing resin-based composite material // 2535707
FIELD: chemistry.SUBSTANCE: stack of prepregs is formed on a matrix, which has a specified shape before obtaining the stack of prepregs with the specified thickness. Placed in the stack prepregs are covered with a packing material and the first semi-finished product and the second semi-finished product are formed by carrying out thermal processing under pressure. The thickness of the first semi-finished product and second semi-finished product is measured. The quantity of additional layers is determined. The layered product is formed by the placement of a required quantity of additional layers on each other between the first semi-finished product and the second semi-finished product, placed in the matrix of the specified shape. The layered product and the matrix are covered with the packing material and the packing material is subjected to thermal influence under pressure.EFFECT: increased physical-mechanical properties of the obtained products.4 cl, 5 dwg

Production of articles from granulated polymer materials (versions) // 2527049
FIELD: process engineering.SUBSTANCE: invention relates to production of articles of granulated polymer materials. Die is filled with polymer granules over 1 mm in size. Cold moulding and blank forming are performed at pressure not destructing the granule structure with subsequent sintering and cooling down. Note here that granulated material sintering temperature makes 0.58-0.80 of the polymer flow point. At making of articles from the mix of granules of at least two polymers with different flow points the sintering temperature makes 0.58-0.80 of that of easily melted polymer.EFFECT: lower material and power input.4 cl, 2 dwg
ethod of producing high-strength polyethylene film // 2489453
FIELD: chemistry.SUBSTANCE: method involves applying pressure of at least 20 bar (2000 kPa) to an amount of disentangled polyethylene and temperature between the b-relaxation temperature and the melting temperature of the disentangled polyethylene TplPE (TmPE) to obtain a block of disentangled polyethylene, slicing a film or tape off the block of disentangled polyethylene and drawing said film or tape in a single or multi-stage drawing step at a total draw ratio of at least 1:20.EFFECT: obtaining articles of high strength using a simple technique with high cost effectiveness.6 cl

ethod of making composite material and apparatus for realising said method // 2481947
FIELD: chemistry.SUBSTANCE: suction hole is formed in the film of an elastic bag (3) for sealing space for fibre meant for saturation with a polymer resin after the beginning of saturation. The suction hole is covered with a plate (56) with holes (57). The polymer resin is sucked from space through the plate (56). In the method of making composite material, a defect formed during saturation of fibre with the polymer resin can be repaired before the polymer resin is hardened without disrupting the order and damaging the fibre. In the composite material formed from material repaired using the method described above, the repaired area is strong and there is particularly no deterioration in strength as a result of repairs after hardening. Thus, the material made using the method and the apparatus disclosed herein is preferable compared to composite material which was repaired after hardening of the polymer resin.EFFECT: reduced deterioration of strength of the composite material owing to repair before hardening.15 cl, 10 dwg

ethod and device for manufacturing of sections of aircraft fuselage bay from fibre composite materials // 2466867
FIELD: machine building.SUBSTANCE: first vacuum film is applied on stable coil-winding core and is treated under vacuum. Fuselage section is placed in layers on coil-winding core by means of its wind around. Then external pressmould is installed on fuselage section, the pressmould being unstable as compared to stable coil-winding core. At that, coil-winding core imparts stability to external pressmould. Then the second vacuum film is applied on external pressmould. The first vacuum film is aerated and the second vacuum film is treated under vacuum in order to shift fuselage section closer to external pressmould and to separate it from coil-winding core on at least one section. Then the whole construction is hardened in autoclave to produce finished fuselage section.EFFECT: improving quality of surface and stability of dimensions of produced fuselage section.14 cl, 7 dwg

ethod of producing articles from powder polymer materials (versions) // 2404055
FIELD: process engineering.SUBSTANCE: invention relates to powder metallurgy and can be used for development of new production processes. In compliance with the first version, proposed method comprises cold pressing of biller from powder polymer materials, their sintering at the temperature lower than their fusion temperature followed by curing at sintering temperature unless complete heating over their entire volume and cooling. Note here that sintering temperature does not exceed 0.66 of the polymer melting point. In compliance with the second version, proposed method comprises mixing of at least two different melting point polymers, cold pressing of preforms, and their sintering at the temperature lower than their fusion temperature followed by curing at sintering temperature unless complete heating over their entire volume and cooling. Note here that sintering temperature does not exceed 0.66 of the melting point of more low-melting polymer. Sintering and cooling of preforms is performed in closed mold or in open air.EFFECT: reduced material input and power consumption.8 cl, 2 dwg

Insulated rail joint and method of its making // 2319802
FIELD: railway transport; permanent way.SUBSTANCE: proposed insulated rail joint consists of rail ends, fishplates with fasteners and glued-in insulating glass plastic-based gaskets. Gaskets are made of laminated epoxy glass plastic, number of layers from 3 to 9, with reinforcement material in form of cord glass cloth in which summary tex of longitudinal threads (warp) and cross threads (weft) is (10-5) to 1. Method of making of electric insulated rail joint includes preparation of surfaces of fishplates, rails and bolts, making of insulating gaskets, making and nesting of prepreg, forming of blanks of insulating gaskets to suit geometry of butt joint surfaces, insulation of surfaces of bolts, gluing-in of insulating gaskets and assembling of joint Nested prepreg with preset number of layers is placed on mandrel with surface following inner outline of fishplate. Layers of adhesive film are placed at both sides of pack of prepreg. So assembled pack is formed, together with mandrel, under vacuum to form insulating gaskets of homogeneous mass and preset geometry. Gaskets, thus formed, are placed on preliminarily treated and heated surface of fishplates, holes for bolts are cut out and then assembling and heat treatment of joint are carried out. Invention makes it possible to develop design and technology of making of electrically insulated rail joint providing high shift resistance at compression.EFFECT: improved service characteristics of track.5 cl, 1 ex, 1 tbl, 1 dwg

ethod of production of the multilayered panel // 2317210
FIELD: chemical industry; aerospace industry; ship-building industry; other industries; methods of manufacture of the multilayered panels.SUBSTANCE: the invention is pertaining to the field of manufacture of the multilayered panels by means of molding in the autoclave at the heightened pressure and may be used in the aerospace industry, ship-building and other industries. The method of manufacture of the multilayered panel consisting of the laminated coating and the filling material provides, that on the laminated coating they put the layer of the filling material and exercise the binding of the filling material with the coating by the method of vacuum-autoclave molding, in which the laminated coating representing the metal-polymeric material in the non-solidified state first place in the vacuum bag set along the coating, on it place the layer of the filling material, then the whole assemblage is put in the common vacuum bag and placed in the autoclave, where the multilayer panel is molded. At that the vacuum bag and the coating are vacuumized, and in the common vacuum bag the pressure is lower, than in the autoclave. The technical result of the invention is reduction of the of labor input for manufacture of the panel at least in 2 times at the expense of joining the operations of molding of the coatings with their adjoining to the filling material at preservation of the strength level of the product.EFFECT: the invention ensures reduction of the of labor input for manufacture of the panel at least in 2 times at preservation of the strength level of the product.4 cl, 2 dwg, 2 ex

ethod for production of sintered bars of required dimensions from powdered polytetrafluoroethylene // 2278785
FIELD: processing of plastics, in particular, production of products from powdered polytetrafluoroethylene, applicable in manufacture of movable reciprocating packing components of friction pairs in various branches of engineering.SUBSTANCE: the method consists in pressing of powdered polytetrafluoroethylene, sintering and cooling. Then, the sintered bars are heated at a temperature of 643+-5K up to melt in restricting mandrels without pressure. The required linear dimensions are attained by multiple thermal treatment in the respective mandrels.EFFECT: simplified production process and expanded range of products.4 dwg, 4 ex

ethod for making polymer-base composition materials // 2266925
FIELD: polymers, chemical technology.SUBSTANCE: invention relates to technology for preparing composition materials. The claimed method involves mixing components, cold pressing blanks and their following caking. The caking procedure is carried out at temperature 280-350°C in closed form providing tension as result of heat expanding of a blank followed by cooling in the form. Before caking treatment with solution of fluorine-containing oligomer of sort "Foleoks" or "Epilam" is possible. The blank can be subjected for preliminary mechanical tension. Caking procedure can be carried out by two-step cycle in the closed form followed by annealing. Invention provides making articles made of composition materials based on high-viscous polymers with high strength and tribotechnical indices and positive properties by section, decreasing time of technological cycle in formation of articles, diminishing intensity of thermal oxidative destruction of material components. Invention can be used in machine engineering for making articles made of polymeric materials of different functional designation.EFFECT: improved making articles.5 cl, 1 tbl, 8 ex

ethod of forming structures used in microsystems technology, and device for its implementation // 2141895
The invention relates to the formation of structures used in Microsystems technology

A method of manufacturing a multi-layered panel made of composite material // 2108910
The invention relates to a process of manufacturing multi-layer panels made of composite materials and can be used in the manufacture of aircraft and ship designs

Device for moulding polymeric composites // 2085377
The invention relates to a device for the manufacture of reinforced plastics and can be used for the manufacture of parts of various shapes for aerospace, automotive and other engineering fields

Installation for pressing articles of powder materials // 2047493
The invention relates to the production of powder materials, mainly construction, by pressing in a vacuum

Press for rubber products // 2033329
The invention relates to equipment for processing of polymeric materials, namely, presses for the manufacture of polymer products, such as oil seals

The process control system of molding articles from thermosetting // 2010714
The invention relates to the automation of the molding process, combined with the polymerization products of thermosetting and may find application in the manufacture of products from plastics using vacuum-molding
 
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