CN85107137B - Dustless manufacturing process of asbestos frictional material - Google Patents

Abstract

The present invention belongs to the improvement of a manufacturing technique of asbestos friction material. The dry-process manufacturing technique of the existing asbestos friction material universally has the problems of large asbestos dust and environment pollution and has large threat for operators. The present invention uses a method of blending material in a hygrometric state and transcribing blanks to thoroughly prevent the generation of the asbestos dust. The blanking productive efficiency is high by using the method of transcribing the blanks. The new technique can also use major short fiber asbestos wool and has low cost.

Description

Dustless manufacturing process of asbestos frictional material

The invention belongs to the improvement of asbestos friction material manufacture process.

The technology of making asbestos friction material at present both at home and abroad is divided into two classes, i.e. wet processing and dry process.Wet processing is that the thick resin as adhesive is controlled in certain polymerization speed scope, after stirring, brute force carries out drying with asbestos wool, powdery charges etc. more then, then with its fragmentation, through the hot-forming goods of finishing, this technology asbestos dust is few, but the cost height needs to use the feldspar cotton fiber, and the intensity of goods is low, easily produces buckling deformation.Dry process is that asbestos wool, powdered resin and powdery charges etc. are sent into batch mixing in the mixer, cold moudling and hot-forming then, the characteristics of this technology are that cost is low, the impact strength height of product, shortcoming is that asbestos dust is big, very big to operator and surrounding environment threat, the asbestos industry mostly adopts dry process to make asbestos friction material both at home and abroad at present.

The present invention is a kind of new asbestos friction material manufacture process method, can high efficiency makes the blank of asbestos friction material, in whole batch mixing-hot press forming technology process, does not have asbestos dust to produce fully.

Be further described below in conjunction with the content of accompanying drawing to process of the present invention, wherein Fig. 1 is the organigram of beater, and 1 is beating pump, and 2 is batch can.

Fig. 2 is the A-A directional profile figure of batch can, and 3 is the shock plate that lays in the batch can.

Fig. 3 is for extracting the shaping equipment schematic diagram.4 is net cage, and 5 is cylinder mould, and 6 is the woollen blanket conveyer belt, and 7 is couch roll, and 8 are the dehydration vacuum tank, and 9 is forming cylinder, and 10 is breast roll, and 11 is automatic stripper, and 12 for connecing the base woollen blanket, and 13 is blank-connecting vehicle, and 14 are the draining roller, and 15 are the rapping washer, and 16 is agitating device.

Process of the present invention with in the past dry process before compounding process operation and hot-forming after operation be duplicate, the technology that key is batch mixing and produces the base sheet is brand-new.Before batch mixing, earlier with quantitative phenolic resins, asbestos fibre places water to soak 24 hours, and then the phenolic resins that will soak into, asbestos wool is together with the powdery casting resin, copper wires etc. are put into beater (Fig. 1) and are added the water batch mixing, the circulatory system that beater is made up of beating pump (1) and batch can (2), beating pump does not stop from the batch can bottom mixed slurry to be sucked, enter in the jar by the beating pump outlet then, powerful spray Vent is on shock plate (3), make the loose softness of asbestos fibre, various raw materials evenly mix, through the ballistic motion of repeated multiple times suction-ejection, slip has become uniform asbestos fibre suspension mixed liquor in the batch can.The process of producing blanket also is different from old technology fully, the technical process of producing blanket is as follows: the asbestos fibre suspension mixed liquor that obtains behind the batch mixing is sent into copied in the net cage (4) of getting base device (Fig. 3), cylinder mould (5) in the net cage rotates under the dragging of woollen blanket conveyer belt (6), asbestos suspension forms film on the copper mesh on cylinder mould surface, the woollen blanket conveyer belt is when dragging the cylinder mould rotation, asbestos film on the copper mesh of cylinder mould surface is adsorbed on the surface of woollen blanket, pressure between couch roll (7) and cylinder mould is got rid of the part moisture content in the asbestos film, the woollen blanket conveyer belt is a cycle rotation for no reason, by continuing operation forward behind first cylinder mould, again the asbestos film that forms on second cylinder mould is adsorbed in above it during through second cylinder mould, when the woollen blanket conveyer belt passes through vacuum tank (8), the dehydration of asbestos film, shaping roller (9) in layer shifts winding in its surface with the asbestos film on the woollen blanket conveyer belt then, after reaching the desired thickness of technology, promptly by the incision of the automatic stripper on the shaping roller (11) bullet and from roller, connect base woollen blanket (12) and send out by blank-connecting vehicle (13) and connect away, transferred to the cut-out molding procedure.Continuously the woollen blanket conveyer belt that rotates the asbestos film by the format roll socket joint from after, move to rapping washer (15) through breast roll (10), by the rapping washer its lip-deep residue particulate is disposed, after moving to draining roller (14) extrusion drainage more forward, the woollen blanket conveyer belt reruns and arrives the cylinder mould position, draw the asbestos film once more, shuttling movement is copied and is got blank like this.The sizing device (16) that stirs in the net cage is provided with at the weight body in the asbestos mixed serum, is copying when getting, and it rotates with never stopping for an instant, guarantees that the weight body in the asbestos slurry does not precipitate, and can suspend equably and is copied and get.

Copy and get the blanket of making and be sent on the lath cutter and be cut into the middle compact sheet that meets punching operation by the process stipulation size, on stamping machine, strike out the fritter base sheet of all size then with stripping pattern, at last fritter base sheet is made into arc brake sheet tablet (clutch disc does not have this procedure) enclosing on the type mold, tablet neatly is placed in carries out drying on the dry vehicle frame, treat hot-forming usefulness.

Batch mixing, the system of copying, this three process of system type all are to operate under hygrometric state in the new technology, so do not produce asbestos dust, have thoroughly broken away from the harm of asbestos dust; Asbestos fibre is loose evenly in the goods, and quality is good; To get blanket be to carry out continuously and copy, and improves greatly than old technology production efficiency; And can use more short fiber asbestos suede to make framework material, reduce product cost.

Be one embodiment of the present of invention below.

Getting the phenolic resins that accounts for product weight 30% and 50% respectively and 5 grades of asbestos wools places in the water and soaks, asbestos wool is that whole bag soaks, in order to avoid overflow dust, soak time is 24 hours, the phenol-formaldehyde resin powder that will soak, asbestos wool are put into the quantitative water making beating batch mixing of beater adding together with the feldspar powder that accounts for product weight 18% and a small amount of brass wire then, and the rotating speed of beating pump is 1450 rev/mins, batch mixing 10 minutes, as find still to have asbestos group after the making beating, continue to start beater to asbestos and roll into a ball till the dispersion.The concentration of preparing to be used to copy the asbestos suspension mixed liquor of getting behind the batch mixing is controlled at 3-4%, copy the speed of getting: 20 ± 2 meters/minute, dehydration vacuum 150～300mmHg, copy and get back base sheet moisture content and be controlled between 20%～25%, the base sheet that makes is cut into middle piece by technological requirement, on stamping machine, strike out the fritter base sheet of all size again with stripping pattern, make the arc blank sheet on the pattern tool enclosing then, proper alignment is dry on drying cart, baking temperature: 60 ℃, be used for the hot-forming finished product that makes after to be dried.

Claims (3)

1, a kind of method of manufacturing technology of asbestos friction material, utilize phenolic resins to be adhesive, with the asbestos wool is skeleton, pass through batch mixing, base, operations such as hot pressing are made asbestos friction material, it is characterized in that: before batch mixing, earlier with quantitative powdered phenol-formaldehyde resin, asbestos wool is put into water and was soaked 24 hours, the powdered phenol-formaldehyde resin that will soak into then, asbestos wool is together with the powdery casting resin, copper wires etc. are put into beater and are added the water batch mixing, the asbestos suspension mixed liquor that mixes sent into copy the machine of getting and make blanket, utilize the cut-out shaping machine set that blanket is cut into the middle compact sheet that meets punching operation by the process stipulation size then, strike out the goods blank with stripping pattern again, the goods blank is made arc blank (the clutch blank does not have this procedure) enclosing on the type mold, again with hot-forming after the blank drying.

2, the described asbestos friction material manufacture process method of a kind of claim 1, it is characterized in that: compounding process is to carry out in a circulatory system of being made up of beating pump (1) and batch can (2), mixed slurry is sucked by beating pump from the batch can bottom, be discharged in the jar by the beating pump outlet then, powerful spray Vent is on shock plate (3), by the repeated stock campaign, make asbestos fibre loose, soft, be evenly distributed in the suspension mixed liquor.

3, a kind of asbestos friction material manufacture process method as claimed in claim 1 or 2 is characterized in that: the asbestos friction material blanket is by net cage (4), the cylinder mould (5) that rotates in net cage and drive that cylinder mould rotates and the absorption of the asbestos film on cylinder mould copper mesh woollen blanket conveyer belt (6) and copying on the taking equipment of forming of forming cylinder portions such as (9) thereon made continuously.

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