CN102832761B - Preparation method for bonding laminated pieces of silicon steel piece at edge section of iron core of stator into whole - Google Patents
Preparation method for bonding laminated pieces of silicon steel piece at edge section of iron core of stator into whole Download PDFInfo
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- CN102832761B CN102832761B CN201210345187.XA CN201210345187A CN102832761B CN 102832761 B CN102832761 B CN 102832761B CN 201210345187 A CN201210345187 A CN 201210345187A CN 102832761 B CN102832761 B CN 102832761B
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Abstract
The invention provides a preparation method for bonding the laminated pieces of a silicon steel piece at the edge section of an iron core of a stator into a whole. By the modes of bonding 6 laminated pieces at the edge section of a silicon steel piece of an iron core of a stator in a mould in an integrating way into a laminated piece group and then bonding the laminated piece group in a construction site in situ integrally into a whole according to the preparation method for bonding the laminated pieces of the silicon steel piece at the edge section of the iron core of the stator into the whole, the stability of the bonding quality of the edge section is effectively ensured, and the occurrence of relative displacement of the laminated pieces of the silicon steel piece at the edge section of the iron core when a machine set runs for a long time is prevented. The defects of large volume and non-uniform heating of a stator of a large-sized water wheel generator are avoided. The advantage that the shear strength of an adhesive is highest after the adhesive is solidified under the conditions of heating and pressurizing is fully exerted.
Description
Technical field: the present invention relates to hydraulic generator manufacturing technology field, particularly relates to the preparation method that a kind of edge section of iron core of stator silicon steel sheet lamination is bonded to one.
Background technology: in order to reduce iron loss, Stator Core of Large Hydrogenerator is after being coated with insulating barrier by the thick silicon steel sheet lamination of 0.35mm or 0.5mm, composition is fixed with tooth support, along with the continuous increase of hydraulic generator capacity, stator-core lamination is stressed more complicated, during unit operation, electromagnetic force, thermal stress, mechanical force etc. are applied on edge section of iron core of stator lamination.Stator core adopts tooth support to be fixed mode usually, namely applies certain pressure at two ends unshakable in one's determination, stator core is become have the entirety of some strength by this pressure.This kind of structure is in the unit that core length is larger, pressure cannot uniform transmission to the two ends of lamination, cause stator-core lamination pressure at two ends different, the lower end stator-core lamination more loose at pressure is subject to electromagnetic force, shaking force, can there is relative displacement to the stator core center of circle in radial direction in thermal stress etc., even scratch stator bar, cause ground fault to occur.
Summary of the invention:
The object of this invention is to provide one prevents stator-core lamination to the stator core center of circle, relative displacement occurring, the preparation method that the edge section of iron core of stator silicon steel sheet lamination causing ground fault to occur is bonded to one, and technical scheme of the present invention is:
Before a, individual silicon steel sheet limit section lamination are bonding, dip in a little acetone erasing dirt by needing individual bonding silicon steel sheet limit section lamination cotton yarn and dry at clean environment;
B, silicon steel sheet adhesive brown color curing agent is joined in the light yellow epoxy resin of modification according to mass ratio 1:10, stir, the adhesive of each use need be finished in 1h after preparing, and the viscosity 4# cup of adhesive is measured as 90 ± 20 seconds, uses during this glue and does not dose solvent;
C, be coated on silicon steel sheet with lamination Special coating glue roller by two-sided for the silicon steel sheet adhesive prepared, be placed on mould individual silicon steel sheet limit section lamination single spreading and bottom topmost, by individual silicon steel sheet limit section lamination uniform gluing during brush coating, avoid producing leak source, glue-spread is moderate, be as the criterion not have unnecessary glue to clamp-on in stator slot, the consumption of glue is 0.5% of the silicon steel sheet weight be gummed, ensures that cured glue film thickness is less than 0.1 millimeter;
D, be coated with the lamination brushing adhesive and be placed in the mould manufactured according to laminate shape fixing, limit each specification of section lamination that same unit need bond is divided into two groups, namely 6 is one group, 6 are vertically placed in a mould, individual silicon steel sheet limit section lamination contact with mould above and pad one deck polyfluortetraethylene plate below, plate thickness 1 millimeter, lamination slot portion and yoke portion the first alignment pin and the second alignment pin are fixed, vertical pile between lamination, between two laminations, vertical direction tolerance is less than 0.1 millimeter;
E, lamination gluing is also placed in a mold, wipe lamination surrounding with cotton yarn or calico to trickle the glue, the mould putting into lamination is arranged on hydraulic press, with the electric boiling plate that lower platen on hydraulic press and mould surrounding are installed, silicon steel sheet lamination and adhesive are heated, outer wrap asbestos cloth simultaneously, temperature is evenly raised to 60 DEG C from room temperature, programming rate be 10 DEG C every 10 minutes, before intensification, start on mould, apply 0.5MPa pressure, before temperature is elevated to 40 DEG C, pressure is elevated to 2MPa gradually, if there is unnecessary adhesive to extrude, dip in acetone with cotton yarn or cloth to clean out,
F, hydraulic generator silicon steel sheet bonded adhesives cure under pressure after 10 hours at 60 DEG C, namely individual silicon steel sheet limit section lamination is bonded to one, be a stack of laminations, Adhesive thickness between silicon steel sheet lamination after bonding is less than 0.1 millimeter, inflexibility when bonding stack of laminations mould unloading, transportation and dress pressure;
G, bonding 6 silicon steel sheet limit section laminations are integrally when stator-core lamination, each bonding all-in-one-piece stack of laminations stacks side by side, between upper and lower two laminates, stack of laminations and stack of laminations seam stagger 1/2nd silicon steel sheet stack film trap numbers, upper and lower surface brushing adhesive stick during lamination assembling pressure, after edge section of iron core of stator lamination dress pressure, keep dress pressure pressure unshakable in one's determination 72 hours, adhesive is fully solidified, and the bonding one-tenth of edge section of iron core of stator is as a whole.
Technical characterstic of the present invention is, 6 stator core silicon steel sheet laminations stick with glue the bonding one-tenth silicon steel sheet stack of laminations of agent heating pressurization in a mold, then at each silicon steel sheet stack of laminations in erecting bed, stator core building site external coating adhesive when stator dress is pressed, every layer of silicon steel sheet stack of laminations interfolded, bonding integral by adhesive, it is a kind of pioneering stator core silicon steel sheet integration adhesive technology.Show as: the shear strength between the bonding rear edge section of iron core of stator silicon steel sheet lamination of integration is greater than 10Mpa.
The present invention is by stator core silicon steel sheet limit section lamination 6 integration bonding one-tenth stack of laminations in a mold, then in building-site stack of laminations integral adhesive all-in-one-piece mode, effectively ensure that limit section bonding quality is stablized, avoid large-sized water turbine generator stator bulky, the shortcoming that heating is uneven.Give full play of the adhesive advantage that adhesive shear strength is the highest after heating cures under pressure.
Adopt the present invention effectively can reduce core loss, prevent electromagnetic force, thermal stress, the long-term shock effect such as mechanical force, bonding its shear strength radially can born of limit section silicon steel sheet be integrally greater than its stressed radial direction make a concerted effort, effectively can prevent limit unshakable in one's determination section silicon steel sheet lamination from producing vibrations wearing and tearing or relative displacement occurs, avoid damaging stator bar insulation.
Accompanying drawing illustrates:
Fig. 1 is individual silicon steel sheet limit section lamination of stator core
Fig. 2 is edge section of iron core of stator stack of laminations after overall bonding
Fig. 3 places signal at mould after silicon steel sheet lamination brushing adhesive stick
Fig. 4 is that after the bonding one-tenth stack of laminations of edge section of iron core of stator silicon steel sheet lamination, staggered dress is pressed into the stator core of stator core rear section
Fig. 5 is that stator core needs bonding silicon steel sheet limit section lamination
Embodiment:
The preparation method that a kind of edge section of iron core of stator silicon steel sheet lamination is bonded to one:
A., as shown in Figure 1, before individual silicon steel sheet limit section lamination 1 is bonding, dips in a little acetone erasing dirt by needing individual bonding silicon steel sheet limit section lamination 1 cotton yarn and dry at clean environment;
B. silicon steel sheet adhesive brown color curing agent is joined in the light yellow epoxy resin of modification according to the ratio of mass ratio 1:10, stir.The adhesive of each use need be finished in 1h after preparing, and the viscosity 4# cup of adhesive is measured as 90 ± 20 seconds, uses during this glue and does not dose solvent;
C. lamination Special coating glue roller is used, be coated on silicon steel sheet by two-sided for the silicon steel sheet adhesive prepared, be placed on mould 4 individual silicon steel sheet limit section lamination 1 single spreading and bottom topmost, by individual silicon steel sheet limit section lamination 1 uniform gluing during brush coating, avoid producing leak source, glue-spread is moderate, be as the criterion not have unnecessary glue to clamp-on in stator slot, the consumption of glue is 0.5% of the silicon steel sheet weight be gummed, ensure that cured glue film thickness is less than 0.1 millimeter, inflexibility when bonding stack of laminations mould unloading, transportation and dress pressure;
D. as shown in Figure 3, being coated with the lamination brushing adhesive is placed in the mould 4 manufactured according to laminate shape fixing, each specification of silicon steel sheet limit section lamination 1 that same unit need bond is divided into two groups, namely 6 is one group, 6 are vertically placed in a mould 4, individual silicon steel sheet lamination 1 contact with mould 4 above and pad one deck polyfluortetraethylene plate below, plate thickness 1 millimeter, lamination slot portion and yoke portion the first alignment pin 2 and the second alignment pin 3 are fixed, vertical pile between lamination, between two laminations, vertical direction tolerance is less than 0.1 millimeter;
E. lamination gluing being placed on after in mould 4, wipe lamination surrounding with cotton yarn or calico to trickle the glue, the mould putting into lamination is arranged on hydraulic press, with lower platen on hydraulic press and mould surrounding electric boiling plate, silicon steel sheet lamination and adhesive are heated, outer wrap asbestos cloth simultaneously, temperature is evenly raised to 60 DEG C from room temperature, programming rate be 10 DEG C every 10 minutes, before intensification, mould applies 0.5MPa pressure, before temperature is elevated to 40 DEG C, pressure is elevated to 2MPa gradually, if there is unnecessary adhesive to extrude, dip in acetone with cotton yarn or cloth to clean out,
F. as shown in Figure 2, hydraulic generator silicon steel sheet bonded adhesives cure under pressure after 10 hours at 60 DEG C, namely individual silicon steel sheet limit section lamination is bonded to one, be a stack of laminations 5, Adhesive thickness between silicon steel sheet limit section lamination after bonding is less than 0.1 millimeter, inflexibility when bonding stack of laminations mould unloading, transportation and dress pressure.
G. as shown in Figure 4, bonding integrally silicon steel sheet stack of laminations is when stator core dress pressure, each bonding all-in-one-piece stack of laminations 5 stacks side by side, between upper and lower two laminates, stack of laminations and stack of laminations seam stagger 1/2nd silicon steel sheet stack film trap numbers, upper and lower surface brushing adhesive stick during lamination assembling pressure, after edge section of iron core of stator lamination dress pressure, keeps dress pressure pressure unshakable in one's determination 72 hours, adhesive is fully solidified, and the bonding one-tenth of edge section of iron core of stator is as a whole.
Claims (1)
1. the preparation method that is bonded to one of edge section of iron core of stator silicon steel sheet lamination, is characterized in that:
Before a, individual silicon steel sheet limit section lamination (1) are bonding, dip in a little acetone erasing dirt by needing individual bonding silicon steel sheet limit section lamination (1) cotton yarn and dry at clean environment;
B, silicon steel sheet adhesive brown color curing agent is joined in the light yellow epoxy resin of modification according to mass ratio 1:10, stir, the adhesive of each use need be finished in 1h after preparing, and the viscosity 4# cup of adhesive is measured as 90 ± 20 seconds, uses during this glue and does not dose solvent;
C, be coated on silicon steel sheet limit section lamination (1) with lamination Special coating glue roller by two-sided for the silicon steel sheet adhesive prepared, be placed on mould (4) individual silicon steel sheet limit section lamination (1) single spreading and bottom topmost, by individual silicon steel sheet limit section lamination (1) uniform gluing during brush coating, avoid producing leak source, glue-spread is moderate, be as the criterion not have unnecessary glue to clamp-on in stator slot, the consumption of glue is 0.5% of the silicon steel sheet weight be gummed, ensures that cured glue film thickness is less than 0.1 millimeter;
D, being coated with the lamination brushing adhesive is placed in the mould (4) manufactured according to laminate shape fixing, silicon steel sheet limit section lamination (1) each specification that same unit need bond is divided into two groups, namely 6 is one group, 6 are vertically placed in a mould (4), individual silicon steel sheet limit section lamination (1) contact with mould (4) above and pad one deck polyfluortetraethylene plate below, plate thickness 1 millimeter, lamination slot portion and yoke portion the first alignment pin (2) and the second alignment pin (3) are fixed, vertical pile between lamination, between two laminations, vertical direction tolerance is less than 0.1 millimeter,
E, lamination gluing is also placed on after in mould (4), wipe lamination surrounding with cotton yarn or calico to trickle the glue, the mould putting into lamination is arranged on hydraulic press, with the electric boiling plate that lower platen on hydraulic press and mould surrounding are installed, silicon steel sheet lamination and adhesive are heated, outer wrap asbestos cloth simultaneously, temperature is evenly raised to 60 DEG C from room temperature, programming rate be 10 DEG C every 10 minutes, before intensification, start on mould, apply 0.5MPa pressure, before temperature is elevated to 40 DEG C, pressure is elevated to 2MPa gradually, if there is unnecessary adhesive to extrude, dip in acetone with cotton yarn or cloth to clean out,
F, hydraulic generator silicon steel sheet bonded adhesives cure under pressure after 10 hours at 60 DEG C, namely individual silicon steel sheet limit section lamination (1) is bonded to one, be a stack of laminations (5), Adhesive thickness between silicon steel sheet lamination after bonding is less than 0.1 millimeter, inflexibility when bonding stack of laminations mould unloading, transportation and dress pressure;
G, bonding 6 silicon steel sheet limit section laminations are integrally when stator-core lamination, each bonding all-in-one-piece stack of laminations (5) stacks side by side, between upper and lower two laminates, stack of laminations and stack of laminations seam stagger 1/2nd silicon steel sheet stack film trap numbers, upper and lower surface brushing adhesive stick during lamination assembling pressure, after edge section of iron core of stator lamination dress pressure, keep dress pressure pressure unshakable in one's determination 72 hours, adhesive is fully solidified, and the bonding one-tenth of edge section of iron core of stator is as a whole.
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