JP2863025B2 - Method of assembling bonded structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of members such as a transformer and a drum in a rotary head device, a head support and a drum in a rotary head device, or a head support arm and a head provided in a hard disk device. It relates to the assembly method of the adhesive structure that is fixed via a layer (adhesive), in particular the dimension between members mutually, method of assembling the adhesive structure which can be set by the thickness adjustment of the adhesive layer.

[0002]

2. Description of the Related Art There are cases where various parts are fixed via an adhesive in electronic equipment or other equipment. Generally, the adhesive has a property of contracting when cured.
The thickness dimension of the adhesive layer is unstable. Therefore, in the case of a structure that must maintain high dimensional accuracy, various measures are required in the bonding process.

Conventionally, as a measure for maintaining the dimensional accuracy of a structure using this type of adhesive, it has been considered to make the thickness of the adhesive layer constant. For example, a method of adding glass beads having a certain particle size to an adhesive and pressing the parts to be bonded together to make the thickness of the adhesive layer the same as the particle size of the glass beads, or bonding. There has been adopted a method in which a shim having a certain thickness is interposed in the layer, and the parts to be bonded are pressed to make the thickness of the bonding layer equal to the thickness of the shim.

[0004]

However, in the above-mentioned measures, in order to keep the thickness of the adhesive layer constant, expensive glass beads having small variation in outer diameter are selected and used, or the thickness is reduced. The use of shims set with high precision requires high costs as a whole, requires the application of uniform pressure between parts to perform the bonding work, requires complicated work processes, and requires skilled assembly techniques. become.

[0005] Further, the conventional measures have been considered only to make the thickness of the adhesive layer constant by the glass beads or shims, so that the actual structure absorbs the dimensional variation of the parts to be bonded. In the completed structure, the variation in the thickness of the adhesive layer is added to the variation in the dimensions of each component, and the variation from the reference plane of one component to a position of the other component is added. It has been difficult to maintain dimensions with high precision. Therefore, in the case of a structure using the shim, the actual dimensions of the parts to be actually used are measured, the error is obtained, and one having a predetermined dimension is selected from a plurality of types of shims based on the error. Work becomes necessary, and the work becomes very complicated.

The present invention solves the above-mentioned conventional problems, and eliminates instability such as shrinkage due to curing of an adhesive layer, and furthermore, an adhesive capable of setting the overall dimensions of a completed structure with high accuracy. It is an object to provide a method for assembling a structure.

[0007]

Means for Solving the Problems] This onset Ming, adhesion of the first member and the assembly side <br/> method consists bonded structure by bonding the second member, at least one member With the curing acceleration primer applied to the surface,
Oppositely, an anaerobic-curable and ultraviolet-curable adhesive composition is filled between the adhesive surfaces , and then the adhesive structure
The present invention is characterized in that both members are held so that the thickness of the whole body becomes a predetermined dimension value, and the adhesive composition is irradiated with ultraviolet rays to join the two members .

In the present invention, as shown in FIG.
When the component B having the same variation in the dimension L2 as the component A having the variation in
After the adhesive is filled, the required size (for example, the bottom surface of the component A and the upper surface of the component B) L of both components is held to a specified size, and the adhesive is cured in this held state. Thus, the specified dimension L can be obtained regardless of the variation in the dimensions L1 and L2 of each component, and the variations L1 and L2 are absorbed by the thickness dimension δ of the adhesive layer C.

As the adhesive used for the adhesive layer C, a two-component epoxy resin, a urethane resin, a heat-curable epoxy resin, an anaerobic adhesive or the like can be used. The urethane resin or the urethane resin has a long curing time, and if the curing time is shortened, the pot life after mixing the two components becomes extremely short, which is not practical. A one-part heat-curable epoxy resin can be used, but it is not practical because a long time of heating is required after filling the adhesive. Anaerobic adhesives can also be used, but are not practical because the protruding parts between the parts do not cure.

Therefore, as the adhesive used in the present invention, an anaerobic imparting type ultraviolet curable resin is most suitable . In the bonding layer C, a portion where irradiation with ultraviolet light is impossible is hardened anaerobically, and a protruding portion is hardened with ultraviolet light.

When the component material is inert to anaerobic hardening, or when the thickness of the adhesive layer C is large, and when it is desired to shorten the process time by shortening the hardening time,
After applying the curing accelerating primer to one or both parts, an anaerobic imparting type ultraviolet curable resin adhesive is filled. This promotes anaerobic curing inside the adhesive layer C.

As described above, in the present invention, since the adhesive structure having the adhesive layer C formed by adjusting the thickness δ is used, no shim or the like is required, and the process can be simplified, and the manufacturing process time can be reduced. Can be shortened. Further, the overall dimensional accuracy of the bonded structure can be set high, and the bonded structure can be used as a component requiring dimensional accuracy.

Here, the anaerobic imparting type ultraviolet curable resin adhesive used for the adhesive layer C of the present invention is a prepolymer having one or more acrylic or methacrylic groups at both ends or side chains. An anaerobic-curable and ultraviolet-curable adhesive composition composed of at least one polymerizable monomer selected from an acrylic monomer and a methacrylic monomer, a photopolymerization initiator, and an anaerobic catalyst. Things. The present adhesive composition has a quick curing property, is excellent in workability, has water resistance, and has long-term reliability.

The protruding portion is hardened by irradiation of ultraviolet rays because its hardening is inhibited by oxygen in the air and remains in a liquid state. The part that cannot be irradiated with ultraviolet light is an adhesive that hardens anaerobically.

The prepolymer having one or more acrylic or methacrylic groups at both ends or side chains includes urethane (meth) acrylic prepolymer, epoxy (meth) acrylic prepolymer, polyester (meth) acrylic prepolymer, polybutadiene ( (Meth) acrylic prepolymers and the like, one of which is used, or a mixture of two or more thereof.

At least one polymerizable monomer selected from an acrylic monomer and a methacrylic monomer is 2
Hydroxyethyl (meth) acrylate, 2 hydroxypropyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, butoxyethyl (meth) acrylate, ethyldiethylene glycol (meth) acrylate, 2ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, Phenoxyethyl (meth) acrylate, 2-hydro-3-phenyloxypropyl (meth) acrylate, dicyclopentadiene (meth) acrylate, trimethylolpropane tri (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, 1,6 hexane Diol di (meth) acrylate, neopentyl glycol di (meth)
Acrylate, tri (meth) acryloxyethyl phosphate, and the like, and one of these is used,
Alternatively, a mixture of two or more can be used.

Examples of the photopolymerization initiator include 2,2 dimethoxy-2-phenylacetophenone, 2,2 diethoxyacetophenone, 1-hydroxycyclohexylphenyl ketone, benzoylalkyl ether, benzophenone, methylbenzoyl formate, and the like. Or a mixture of two or more.

Anaerobic catalysts are organic peroxides and amine catalysts. Organic peroxides include diacyl peroxide, ketone peroxide, hydroperoxide,
Dialkyl peroxide, peroxyester and the like, specifically, known free radical generators such as benzoyl peroxide, cumene hydroperoxide, t-butyl hydroperoxide, methyl ethyl ketone peroxide, t-butyl peroxyacetate One of these can be used, or a mixture of two or more can be used.

Examples of the amine catalyst include triethylamine, tripropylamine, dimethylaniline, toluidine, orthosulfobenzimide, tetrahydroquinoline and the like. One of these can be used, or a mixture of two or more can be used.

The curing accelerating primer is a kind of thioureas, copper compounds such as cuprous chloride, copper naphthenate and copper acetylacetone, such as thiourea, ethylenethiourea and acetylthiourea; and amine compounds such as dimethylaniline and toluidine. Or a mixture of two or more.

[0021]

EXAMPLE 1 A fixed drum for a rotary head device made of an aluminum alloy was used as a component A shown in FIG. 1, and a ferrite rotary transformer core was used as a component B. The rotary transformer core is held by a magnet, and the gap δ between the two is set to 50 μm.
Was filled with (adhesive 1) shown in Table 1 below. In addition, the following Table 3 shows the bonding surface of the rotary transformer core (part B).
Was applied. After filling the adhesive, the periphery of the gap δ was irradiated with ultraviolet rays of 150 mw / cm ² to cure the adhesive and obtain an adhesive layer C.

(Example 2) An adhesive layer C was obtained by using the (adhesive 2) shown in Table 1 below and by the same method and conditions as in the above (Example 1).

The components of (Adhesive 1) used in (Example 1) and (Adhesive 2) shown in (Example 2) are shown in Table 1 below.
Shown in In Table 1, the right column shows the weight ratio of each component.

[0024]

[Table 1]

The physical properties of (Adhesive 1) and (Adhesive 2) are as shown in Table 2 below.

[0026]

[Table 2]

The test methods for the physical properties in Table 2 are as follows.

Test method 1) UV curability Irradiation of 150 mw / cm ² of ultraviolet light, the integrated amount of ultraviolet light until the tensile adhesive strength reaches the maximum value 2) Tensile adhesive strength 5 × 50 × 50 mm transparent glass and 13 mmφ Each adhesive composition is applied to a round iron bar, and irradiated with an integrated amount of ultraviolet light of 5000 mj / cm ² to cure the adhesive composition. After curing, the tensile adhesive strength was measured at a tensile speed of 10 mm / min.

The curing acceleration primers used in the above examples are as shown in Table 3 below. In Table 3, the values in the right column are weight ratios.

[0030]

[Table 3]

(Results) In Examples 1 and 2, when the change in the thickness of the adhesive layer C after the adhesive was cured was measured, the shrinkage change in the thickness δ was 2 μm or less (measurement accuracy or less). There was almost no change in thickness.

In the above embodiment in which an aluminum alloy drum (part A) and a ferrite core for a rotary transformer (part B) were bonded by an adhesive layer C of δ = 50 μm, after the adhesive was applied, The time (set time) until the holding of the component B is released is 60 in the first embodiment.
And 45 seconds in Example 2 (however, the ambient temperature was 25 ° C.).

[0033] Thus, in FIG. 1, the gap between both parts
Is filled with the adhesive of the above embodiment, and the part A is magnetized.
By setting the dimension L to the standard dimension value by holding the adhesive and curing the adhesive by irradiating ultraviolet rays,
Clearance dimension with little error (thickness dimension of adhesive layer C) δ
The variation of the dimensions L1 and L2 of each part can be adjusted (absorbed) by the dimension of δ, and an adhesive structure in which the specified dimension L is set with high precision can be obtained.

[0034]

According to the present invention described in detail above, it is possible to obtain an adhesive layer having a stable thickness, and by adjusting the thickness of the adhesive layer, it is possible to absorb variations in the dimensions of parts and to obtain an adhesive with high dimensional accuracy. A structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an adhesive structure.

[Explanation of symbols]

 A first component B second component C adhesive layer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hikaru Sato 1-7 Yukitani Otsuka-cho, Ota-ku, Tokyo Alps Electric Co., Ltd. (72) Inventor Tsutomu Saito 2-8-33 Wakamatsucho, Fuchu-shi, Tokyo Chemite (56) References JP-A-2-73.508 (JP, A) JP-A-2-140067 (JP, A) JP-A-57-65712 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) C09J 5/00-5/02 H04N 5/00-5/95 G11B 5/53

Claims (2)

(57) [Claims] A first member and a second member bonded to each other;
In the method for assembling an adhesive structure to be formed, in a state where a curing accelerating primer is applied to the adhesive surface of at least one member, the adhesive surfaces of both members are opposed to each other, and
Is filled with an anaerobic-curable and ultraviolet-curable adhesive composition, and thereafter, both members are held so that the thickness of the entire adhesive structure becomes a predetermined dimensional value, and ultraviolet light is applied to the adhesive composition. A method for assembling an adhesive structure, comprising irradiating and joining both members . 2. The adhesive composition comprises a prepolymer having one or more acrylic or methacrylic groups at both ends or side chains, and at least one polymerizable monomer selected from acrylic monomers and methacrylic monomers. 2. The method for assembling an adhesive structure according to claim 1, further comprising a novel monomer, a photopolymerization initiator, and an anaerobic catalyst.