JPH01312268A - Guide sheave - Google Patents

Abstract

PURPOSE:To prevent the break of a copper wire, and to reduce the abrasion of a shieve and further to enhance durability by forming the shieve making polyimide resin the main component, and blending with a conductive filler. CONSTITUTION:The polyimide resin to be used for a guide sheave is made of engineering plastic being excellent in both heat resistance and chemical resistance. The guide sheave is formed by a blend consisting of 50 to 95vol% of polyimide resin and 5 to 50vol% of conductive filler. Thus, the sheave itself is not charged with static electricity, and consequently the break of a copper wire due to being wound round the sheave can be eliminated. Further, the sheave formed by making polyimide resin the main component has a very small specific gravity of 1.35 to 1.95 and is reduced in weight, and when it is used in a wire-enameling process, the torque to be added to the copper wire can be reduced, so that the frequency of breaks of the copper wire can be reduced. Furthermore, by filling the filler, the abrasion resistance and durability of the sheave itself can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a guide sheave, and particularly to a guide sheave that can be suitably used in a wire double name ringing device.

<Conventional technology> With the development of the electronics field in recent years, the steel wires used for magnet wires used in precision equipment, acoustic instruments, measuring instruments, control equipment, etc. have become thinner and thinner.
,05-0.03) to ultra-fine 41 (0,01-0.03).
U3jlj). Such copper wire usually has an insulating enamel coating,
A number of problems have arisen regarding the guide sheaves used in the wire two-namering equipment used for the coating, especially the guide sheaves used in the baking process.

Traditionally, guide sheaves made of aluminum have generally been used because of their high precision machinability, light weight, and heat resistance.In addition, the guide sheaves are made of aluminum to prevent damage to the steel wire and enamel coating, and to prevent damage to the enamel coating. Coating with Fug resin is applied to prevent corrosion due to contact.

However, as mentioned above, as the wire diameter of steel wire becomes extremely thin and as the wire speed in enameling equipment increases from the viewpoint of productivity, the number of breaks in copper wire due to guide sheaves is increasing. This is because the diameter of the steel wire is small and the wire speed during coating is high, so the fluororesin film coated on the guide sheave may be significantly worn or damaged.
This is due to the winding of the copper wire due to static electricity charged on the fluororesin film. Furthermore, when the @ wire wrapped around the sheath due to wire breakage is removed, the coated fluororesin film and the sheep's eye body are damaged, causing a repeating vicious cycle that causes wire breakage.

Furthermore, since the specific gravity of aluminum fissured sheep is relatively high at approximately 2.7, the torque that exceeds the tensile strength of the copper wire may cause the wire to break, and the free space of the sheep itself may place a load on the bearings fitted into the sheep. There were problems such as shortening the life of the f-bearing due to one rotation failure.

<Problems to be Solved by the Invention> As mentioned above, the guide sheep used in the wire enameling process is used in a harsh environment, and the steel wire breaks frequently, especially during the baking process, resulting in low yields. 2-in recovery from a bad, disconnected state.

It was difficult to say that productivity was good because complicated operations such as replacing the sheep and re-fluorinating the sheep were required.

In recent years, ceramic sheep with improved wear resistance and lightweight plastic sheep have been proposed as alternatives; Contamination of worn materials may occur. Also aluminum.

Due to its higher specific gravity (approximately 3.3) than that made by Ram, a large torque is applied to the copper wire, and it has problems such as the wire itself cracking, which can lead to wire breakage and wire failure. It is. On the other hand, although the latter type of plastic sheet improves the above problems, it does not have heat resistance or chemical resistance, so it is difficult to use in processes that require such characteristics, especially wire enamelling. It is unsuitable for the baking process using the device t.

SUMMARY OF THE INVENTION An object of the present invention is to provide an excellent and special guide sheep that overcomes the above-mentioned problems of conventional guide sheep made of aluminum, ceramic, and plastic.

<Means for Solving the Problems> As a result of extensive studies to achieve the above object, the present inventors have found that when a guide sheet formed using polyimide resin is used in a wire double name ringing device, it is heat resistant. The present inventors have discovered that the copper wire has excellent strength and chemical resistance, and that the number of breaks in the copper wire is reduced, thereby improving productivity.

That is, the guide sheep of the present invention is molded mainly from polyimide resin, and particularly.

A molded guide sheet containing a conductive filler is a preferred embodiment in order to prevent charging due to static electricity.

The polyimide resin used in the guide sheep of the present invention is an engineering plastic with excellent heat resistance TT and chemical resistance, and is practically used as an acid component such as aromatic tetracarboxylic dianhydride and a diamine component such as aromatic diamine. As such an aromatic tetracarboxylic dianhydride, it is preferable to use a wholly aromatic polyimide resin obtained by imide conversion of a polyamic acid obtained by reacting with the aromatic tetracarboxylic dianhydride.

For example, pyromellitic acid, 3,3,4,4'-biphenyltetracarboxylic acid, 2. 3. 3', 4'-biphenyltetracarboxylic acid, 1,2,4,5-7talentetracarboxylic acid, l, 2. 5. 6-su7talentetracarboxylic acid, 2,3,6,7-f7fi
lentithoracarboxylic acid, 3. 3. 4. 4-benzophenonetetracarvone M, 2.2-bis[4-(2
,3-dicarboxyphenoxy)phenyl]7'opan,4,4'-bis(2,3-dicarboxyphenoxy)
Dianhydrides of tetracarboxylic acids such as cyanyl ether? , their oxides, lower alkyl esters, polyhydric alcohol esters, etc., and these may be used alone or in combination of two or more. In addition, the present invention VcP
A part of the aromatic tetracarboxylic dianhydride is ftt.

2, 3. Aliphatic dicarboxylic dianhydride such as 4-butanetetracarboxylic dianhydride may be substituted with any of the dianhydrides.

Further, as the aromatic diamine to be reacted with the aromatic tetracarboxylic dianhydride, 1, for example, 4゜4'-diaminodiphenyl ether, 3.3'-') fi thyl-4,4
'-Diaminodiphenyl ether, 3°3-dimethoxy-4,4'-diaminodiphenyl ether, 3,3-cyanodiphenyl ether.

3. Diphenyl ether type diamines such as 4'-diaminodiphenyl ether are diphenyl thioether type diamines such as these thioethers.

4. Benzophenone diamines such as 4-diaminobenzophenone, 3,3-7methyl-4,4-diaminobenzophenone, and 3,3-diaminobenzophenone, 3.3
-diaminodiphenylmethane.

4. Diphenylmethane diamines such as 4'-diaminodiphenylmethane and 3.3'-dimethyl-4,4'-diaminodiphenylmethane; 2. Bisphenylpropane diamines such as z-bis(4-aminophenyl)furopane and 2,2-bis(3-aminophenyl)propane, 4
, 4-diaminodiphenylsulfoxide, dipenyl sulfoxide diamine of 3,3'-diaminodiphenylsulfoxide donato, 4,4-diaminodiphenylsulfone.

Diphenylsulfonic diamines such as 3.3-/aminodiphenylsulfone, benzidine, 3.3'-di)f rubenzidine, 3.3'-dimethoxybenzidine, :3,
biphenyl diamines such as 3-diaminobiphenyl,
2,6-diaminopyridine.

2. Pyridine diamines such as 6-diaminopyridine and 3,4-diaminopyridine, o-, m- and hp-diaminobenzene, and 3,5-diaminobenzoic acid; 4.
4'-di(m-1 minophenoxy)diphenyl sulfone, 4. +'-di(p-aminophenoxy) diphenyl sulfone, 4,4'-di(m-aminophenoxine diphenyl ether/di, 4°4-di(p-aminophenoxy) diphenyl ether, 4,4-di(m -aminophenoxy)diphenylpropane, 4,4-di(p-7minophenoxy)diphenylpropane, 4.4'-di(m
-7 minophenyl sulfonyl) diphenyl ether.

4.4'-cy(p-aminophenylsulfonyl)diphenyl ether, 4t"-cy(m-7mi/7enyltheoether)diphenylsulfyl-", 4゜4
-di(p-1 minophenyl thioether) diphenyl sulfide, 4,4'-di(m-aminophenoxy) diphenyl ketone, 4,4-/(p-aminophenoxy7) diphenyl ketone, 4,4'-di( m-aminophenoxy)diphenylmethane, 4゜4'-di(p-aminophenoxy)diphenylmethane, 2,5-diaminotoluene,
2,4-diaminoxylene. Diaminodurene, 1,5
-diaminonaphthalene, 2,6-diaminonaphthalene, and the like. These diamines may be used alone or in combination with two types of plates. Further, it is also possible to conveniently use the aliphatic diamine by partially replacing the aromatic diamine with VC.

The M-type solvent used as a reaction solvent for the aromatic tetracarboxylic dianhydride and aromatic diamine is N-methyl-2-pyrrolidone, dimethylacetamide, dimethylformamide, dimethylsulfoxide, and hexamethylenephosphorotriamide.

Solvents such as pyridine and cresol, phenol 2
Examples include phenols such as xylenol. Also,
Hexane and benzene along with the above solvents.

Toluene, xylene, alcohols, and other solvents may be used in combination.

The guide sheep of the present invention is formed by molding the polyimide resin obtained as described above as a main component.
From the viewpoint of moldability, it is preferable to obtain the resin in powder form. Polyimide powder can be obtained, for example, by the following method.

Solution of aromatic diamine and organic polar solvent (diamine'a
Aromatic tetracarboxylic dianhydride is added little by little to the mixture (d = 1 to 30 mol %, preferably d 5 to 10 mol %), and the reaction is gradually allowed to proceed, thereby synthesizing polyamic acid. Next, the temperature is raised to 140 to 250°C for a relatively short time while stirring, for example at a heating rate of about io°C/min, and the imidization is gradually carried out while removing condensed water accompanying imidization from the reaction system. A reaction is carried out to precipitate polyimide particles to form a slurry-like polyimide solution. After cooling the obtained solution,
The desired polyimide powder is obtained by filtering, washing, and drying.

The guide 7-b of the present invention is mainly composed of polyimide resin,
Other resins 1 For example, thermoplastic resins include polyethylene, vinyl chloride JTDA, polystyrene, polypropylene, methacrylic resin, area resin, melamine resin, ABS, as long as the properties such as heat resistance and chemical resistance of the polyimide resin are not impaired. Resin, polyacetal, nylon d
fat, polycarbonate, polyethylene terephthalate,
Polybutylene terephthalate, polyphenylene sulfide, polyphenylene sulfide, phorisulfone, fluorine, polyamideimide, polyamide bismaleimide, holoxybenzylene, olefin vinyl alcohol combination, Ho! Contains J ether sulfone, polyaryl v-), etc., and thermosetting resins include area resin, melamine resin, phenol resin, unsaturated polyester, and epoxy resin.

It can be obtained by blending diallyl phthalate resin, silicone resin, bismaleimide triazine resin, etc., and molding by any molding means such as compression molding.

A preferred embodiment of the guide sieve of the present invention is one in which a conductive filler is blended. The guide plate obtained by blending a conductive filler with the above-mentioned polyimide resin will not be charged with D electricity on the guide plate itself in order to improve the conductivity. This eliminates wire breakage caused by the yA wire wrapping around the sheep, which frequently occurs in the case of coating.

Such a conductive filler 2- may be blended in advance at the time of synthesizing the polyimide powder. In this case, the filler is used as a core particle and is obtained as a purchased powder coated with a polyimide resin. It goes without saying that a conductive filler may be blended into the polyimide resin powder and dispersed uniformly before molding.

Specific examples of conductive fillers include carbon black, graphite, silver powder, copper powder, aluminum powder, nickel powder, titanium powder, carbon fiber, etc. It is blended with The amount of conductive fibers to be mixed is such that the resulting guide sieve has a volume resistance of 1 ot.

It is best to make it Ω・m! It is preferable from the point of view of preventing static electricity, and it is effective to use a guide sheet molded with a compound consisting of 4% by volume of polyimide resin 50-95'' and 5-50% by volume of conductive filler.When the amount of filler is 5% by volume If it is less than 50%, the immersion resistance will increase and the antistatic effect will be insufficient, and if it exceeds 50%, the antistatic effect will be sufficient, but the mechanical strength of the guide sheave will decrease and the durability will decrease. Furthermore, the surface of the sheep becomes rough due to the influence of the filler, which impedes the customization of sliding as a sheep.

The guide sheep of the present invention contains molybdenum disulfide, boron nitrate, etc. as other fillers to improve sliding properties.
Powder such as fluororesin, glass fiber, aramid fiber to improve creep properties.

Fibers or whiskers such as poron 4a fibers, phenolic fibers, 7 liquor alumina fibers, steel and steel alloy fibers, silicon carbide whiskers, glass peas for increased hardness,
Powders such as ceramic, alumina, silicon oxide, and silicon carbide, as well as alumina, silica, mica, bronze, aluminum powder, copper powder, silver powder, nickel powder, etc., are used to improve conductivity, heat resistance, and sliding properties. It can be blended to the extent that it does not interfere. It is preferable that these fillers are mixed to replace a part of the amount of the conductive filler, that is, the total amount of the filler and the conductive filler should not exceed 50% by volume. is preferred.

<Effects of the Invention> Since the guide sheep of the present invention obtained by V straining as described above is molded with polyimide resin as the main component, the specific gravity is 1.
．． It is very small at 35 to 1.95 and is quantified, and when used in the wire enameling process, the copper wire yc)B
The breaking torque is reduced, and the likelihood of wire breakage is reduced. When filled with a conductive filler, an antistatic effect can also be imparted, and disconnection due to entanglement of the copper wire due to the guide sheave being charged can also be prevented.

Furthermore, by filling the guide sheave with filler, the wear resistance of the guide sheave itself is improved, resulting in less wear even during high-speed two-way ringing, and excellent durability.

Therefore, when the copper wire is enamel coated using the guide sheep gold wire two-namering device of the present invention, the occurrence of wire breakage, sheep wear, and damage is reduced even in harsh environments, such as during the baking process, and productivity is improved. It will improve.

<Example> Examples of the present invention will be shown below and specifically explained.

Examples 1 to 3 Approximately equal moles of 3.3.4.4-biphenyltetracarboxylic dianhydride and 4,4-diaminodiphenyl ether were added to a fourth flask, and then graphite with an average particle size of 1μ was added. Add m solution dispersed in N-methyl-2-pyrrolidone in a ball mill according to the formulation shown in Table 1.
711, and heated while stirring to mix uniformly.

Then, when the temperature is raised and continued at 7JII heat t-, it becomes 170-17
In the temperature range of 5°C, water produced as a by-product during dehydration and ring closure of polyamic acid was distilled out and the contents suddenly became cloudy. Then, polyimide particles were precipitated in the form of a sliver Vζ with graphite as the nucleus.

Thereafter, the temperature was gradually raised to 190°C, and the polymerization reaction was continued for 2 hours. Then after finishing the polymerization reaction.

The reaction solution was cooled, and the polyimide composite powder having a structure in which the filler was coated with polyimide resin was isolated by filtration.

The resulting powder bed was then washed twice with N-methyl-2-pyrrolidone and finally twice with acetone. After this series of washing, the polyimide composite powder was
The mixture was heated and dried at 50° C. for 3 hours to obtain the desired polyimide composite powder.

Comparative Examples 12 and 2 Polyimide composite powders were obtained in the same manner as in Examples except that the formulations listed in Table 1 were followed.

The obtained polyimide powder was compressed at a pressure of too01cy/d.
.

A polyimide molded body was produced by heating and compression molding at a temperature of 400°C and a compression time of 30 minutes.

The molded body thus obtained was lathe-processed.

Process it to the dimensions shown in the drawing to make it into a guide sheep, and insert a mini hair ring (NMBL-1040zz) into it.

Guide 7 for baking process of wire double name ring device for polar A-ray
-Pop.

All of the following evaluations were carried out using various guide sheep having the physical property values listed in Table 1 as Comparative Examples 3 to 7.

The guide sheep obtained in each Example and Comparative Example was installed as a guide sheep in a wire two-name ringing device for ultra-fine wire (manufactured by Hachigen Seisakusho), and the presence or absence of winding due to static electricity generation was determined, as well as the degree of loss wI (wear resistance) of the sheep. The frequency of bearing replacement, the frequency of wire breakage, and the operating rate of the equipment were investigated, and the results are also listed in Table 1.

The line drawing conditions are as follows.

Wire diameter: 0.015~0.1) 5 m rotation: (00~3
50 m/min, enamel coat thickness 3 to 7 μm, number of coats 15 times, operating time 3 months, guide sheep atmosphere temperature 2 ooc (lower temperature, #9) As is clear from the results in Table 1, the guide of the present invention Sheep has excellent heat resistance (over 20°C) -? Due to its strength, it can be used as a guide sheet in the baking process of ultra-fine enamelling equipment, for example, and is durable enough to withstand use, and even when exposed to solvents such as enamel face, it will not be corroded by the solvent. It can be seen that it has excellent durability.

Furthermore, the guide sheave of the present invention contains a specific amount of conductive filler so that the volume resistance value is within a specific range, so that it can be provided with 411 tonne prevention property, which prevents winding of the steel wire due to charging! It can be seen that JITs are reduced and it is particularly effective for high speed enameling operations.

[Brief explanation of the drawing]

The drawings show the dimensions of guide sheaves made in examples of the invention.

Claims (2)

[Claims] (1) A guide sheave made of polyimide resin as its main component. (2) The guide sheave according to claim (1), which is formed by molding a mixture consisting of 50 to 95% by volume of polyimide resin and 5 to 50% by volume of conductive filler.