JP6518529B2 - Bonding method of seal member for machine tool and seal for machine tool - Google Patents

Description

  The present invention relates to a method of joining seal members for machine tools, and a seal for machine tools.

Machine tools such as lathes and milling machines are the most basic machines widely used in the manufacturing industry, and various machine tools are used to protect the drive mechanism etc. from chips and coolant (cutting oil) etc. Seal members such as lip seals, slide seals, telescopic seals, cover seals, etc. are used.
The machine tool seal member usually comprises a support member and an elastic member integrated with the support member, and the elastic member is pressed against a predetermined position of the machine tool and used.
At this time, the surface of the machine tool on which the machine tool seal member abuts has various shapes, and the machine tool seal member is attached so that no gap is generated according to the shape of the machine tool-side contact surface. There is a need.

FIG. 8 is a perspective view showing an example of a conventional machine tool seal member. In the machine tool seal member 100 shown in FIG. 8, the elastic member 102 is fixed to the linear support member 101. In the machine tool seal member 100, the elastic member 102 abuts on a predetermined position of the machine tool.
At this time, when the shape of the contact surface on the machine tool side is flat, the machine tool seal member 100 having the linear support member 101 may be attached as it is to a predetermined position. However, for example, when the shape of the contact surface on the machine tool side is a shape having a bending portion, the machine tool seal member 100 can not be bent, so a plurality of machine tool seal members are prepared, Each machine tool seal member is disposed and attached along the contact surface of the machine tool. At this time, the machine tool seal members merely abut the ends thereof.
Therefore, when the machine tool seal member is pressed against the machine tool side, a gap may be generated between the elastic members. When such a gap is generated, chips and coolant may enter the inside of the machine tool seal member through the gap, which may cause contamination or damage of the machine tool.

Further, for example, a seal member for a machine tool as shown in FIG. 9 is also proposed. FIG. 9 is a perspective view showing another example of a conventional machine tool seal member.
In a machine tool seal member 110 shown in FIG. 9, an elastic member 112 is fixed to a support member 111 having an L shape in plan view.
When such a machine tool seal member 110 is used, the seal performance of the bent portion can be improved, but in the butt portion with other machine tool seal members, linear machine tool seal members If you try to match the same problem will occur.
In addition, a machine tool seal member having a shape having a bent portion such as the machine tool seal member 110 prepares an integral molding die for each product as compared to the case of manufacturing a linear machine tool seal member. It can not be avoided that the manufacturing cost is high because it is necessary.

Furthermore, for example, a seal member for a machine tool as shown in FIG. 10 is also proposed. FIGS. 10 (a) and 10 (b) are plan views showing another example of a conventional machine tool seal member.
The seal member 120 for a machine tool shown in FIG. 10 (a) is a support member 121 which has been processed in advance according to the shape of the contact surface on the machine tool side, and an elastic member 122 fixed to the support member 121 by integral molding. And have.
Similarly, a seal member 130 for a machine tool shown in FIG. 10 (b) is also a support member 131 which has been processed in advance according to the shape of the contact surface on the machine tool side, and an elasticity fixed to the support member 131 by integral molding. And a member 132.
In these machine tool seal members 120 and 130, since the elastic members do not have joints (butt portions), it is possible to avoid the above-mentioned inconvenience that chips and coolant intrude from the butt portions of the elastic members.
However, since it is necessary to prepare a mold for integral molding for each product, the machine tool sealing members 120 and 130 have a problem that the manufacturing cost significantly increases.
In addition, there is also a problem that it can not easily cope with design changes and dimension changes on the machine tool side.

  As described above, conventionally, when the machine tool seal member is attached to a predetermined place of a machine tool whose sliding surface has various shapes, the machine tool seal member capable of exerting a reliable seal performance is inexpensive. It was difficult to provide.

Further, for example, Patent Document 1 proposes a wiper for a machine tool capable of reliably scraping off swarf with respect to corner portions at various angles.
In the wiper for a machine tool disclosed in Patent Document 1, a first wiper portion scraping off one surface and a second wiper portion scraping the other surface of the adjacent surfaces constituting the corner portion are disposed at an angle. The opposing edges of the elastic lip portion of the first wiper and the elastic lip portion of the second wiper are integrated, and the angle between the first and second wiper portions is the lip portion. It can be changed by elasticity.

JP, 2006-95651, A

According to the wiper for a machine tool described in Patent Document 1, the shape of the wiper for a machine tool can be deformed according to the shape of the contact surface on the machine tool side. Therefore, even if the shape of the contact surface on the machine tool side is a shape having a bent portion, the lip portion of the machine tool wiper can be brought into contact without a gap.
However, the wiper for a machine tool described in Patent Document 1 pushes the lip portion onto the machine tool since the opposing edges of the lip portion of the first wiper and the lip portion of the second wiper are integrated. When applied, a crack may occur starting from this integral part.
Further, since the integral part described above has only the same degree of flexibility as the lip part, in the case of the wiper for a machine tool, the angle between the first wiper part and the second wiper part approaches 0 °. In the case of large deformation or repeated deformation, breakage may occur at the portion where the above-mentioned lip portion is integrated.
Furthermore, the machine tool wiper described in Patent Document 1 is generally used in combination with a linear machine tool wiper. At this time, it was not possible to prevent the formation of a gap on the joint surface of the machine tool wipers. In addition, since the wiper for machine tools described in Patent Document 1 needs to be manufactured by preparing an integral molding die for each product, compared with the case of manufacturing a linear machine tool seal member, , It could not be avoided that the manufacturing cost would be high.

The present inventors diligently studied to solve such problems, and found a completely new solution not found in the prior art and completed the present invention.
The method of joining seal members for machine tools according to the present invention is a method of joining seal members for machine tools, wherein the seal members for machine tools comprising a support member and an elastic member integrated with the support member are joined. At least the elastic members of the machine tool sealing member are adhered to each other by a silicone-modified urethane-based adhesive.

  The seal for machine tools according to the present invention can be used easily and at low cost, even for machine tool seals having a bending portion, there is no gap in the bending portion. It can be made.

  In the bonding method of the machine tool sealing member, the silicone-modified urethane-based adhesive is preferably a two-component curable silicone-modified urethane-based adhesive.

The machine tool seal member according to the present invention is a machine tool seal including a plurality of machine tool seal members including a support member and an elastic member integrated with the support member,
At least one of the machine tool seal members is bonded to at least one of the other machine tool seal members by a silicone modified urethane adhesive.
The silicone-modified urethane-based adhesive is characterized in that at least the elastic members are adhered to each other.

The machine tool seal of the present invention is a machine tool seal which may have a bent portion, and a plurality of machine tool seal members are adhered by a silicone modified urethane adhesive.
That is, in the machine tool seal of the present invention, the abutting portions of the machine tool seal members are adhered by a specific adhesive. Here, the silicone-modified urethane-based adhesive is excellent in flexibility (stretchability) and excellent in coolant resistance.
Therefore, the machine tool seal can reliably seal the surface of the machine tool in contact with the machine tool seal member regardless of the shape. Moreover, the manufacturing cost is also cheap.

In machine tools for sealing of the present invention, the hardness of the silicone-modified urethane adhesive, the hardness in International Rubber Hardness (IRHD) Test Method M is preferably a 35-8 0.

  In the machine tool seal of the present invention, the silicone-modified urethane-based adhesive is preferably a two-component curable silicone-modified urethane-based adhesive.

The machine tool seal of the present invention is excellent not only in sealability but also in flexibility (stretchability) and coolant resistance.
The method for joining machine tool seal members according to the present invention is suitable as a method for joining the machine tool seal members together in the method for producing the machine tool seal member according to the present invention.

It is a perspective view showing an example of a machine tool seal of the present invention. (A) is a top view which shows one of the seal members for machine tools which comprises the seal for machine tools of this invention, (b) is a side view of (a). It is a perspective view which shows the state which the seal for machine tools shown in FIG. 1 was made to bend. (A) is a perspective view which shows another example of the seal for machine tools of this invention, (b) is a top view of (a). It is a top view which shows typically another example of the machine tool seal of this invention. (A) is a perspective view which shows typically an example of the telescopic cover which used the seal | sticker for machine tools of this invention, (b) is the partial expansion perspective view of (a). (A) And (b) is a schematic diagram for demonstrating the evaluation method of the adhesive force in an Example and a comparative example. It is a perspective view which shows an example of the conventional seal member for machine tools. It is a perspective view which shows another example of the conventional seal member for machine tools. (A) And (b) is a top view which shows another example of the conventional seal member for machine tools, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, an embodiment of a machine tool seal member of the present invention will be described.
FIG. 1 is a perspective view showing an example of a machine tool seal of the present invention.
FIG. 2 is a view showing one of the machine tool seal members constituting the machine tool seal of the present invention, where (a) is a plan view and (b) is a side view.
FIG. 3 is a perspective view showing a bent state of the machine tool seal shown in FIG.

As shown in FIG. 1, in a machine tool seal 1 according to an embodiment of the present invention, two machine tool seal members 10A and 10B are joined via an adhesive layer 13.
The machine tool seal member 10A is obtained by cutting the end of a substantially rectangular metal plate obliquely as shown in FIG. 2 and bending it along the longitudinal direction (left and right direction in FIG. 2A). A support member 11A made of a processed metal plate and a plate-like elastic member 12A fixed by an adhesive (not shown) along the longitudinal direction of the support member 11A.
The machine tool seal member 10B is also fixed at the end portion with a support member 11B made of a processed metal plate which is cut obliquely and bent along the longitudinal direction, and fixed with an adhesive along the longitudinal direction of the support member 11B. And a plate-like elastic member 12B.

In the machine tool seal 1, the machine tool seal members 10A and 10B are disposed so that the sides cut obliquely to the longitudinal direction of the machine tool seal members 10A and 10B face each other, and the opposing elastic members 12A and The adhesive layer 13 is formed between the elastic member 12B.
By thus forming the adhesive layer 13, in the machine tool seal 1, the machine tool seal member 10 </ b> A and the machine tool seal member 10 </ b> B are joined.

The adhesive layer 13 is an adhesive layer made of a silicone-modified urethane-based adhesive.
An adhesive layer made of a silicone-modified urethane adhesive is excellent in flexibility (stretchability). Therefore, even if the seal for the machine tool is used by pressing it against the contact surface on the machine tool side to cause deformation, the adhesive layer does not break, and the predetermined place of the machine tool is reliably sealed. be able to.

Further, in the machine tool seal 1, since the adhesive layer 13 is excellent in flexibility, as shown in FIG. 3, even if the machine tool seal 1 is largely bent, fatal damage to the adhesive layer 13 (elastic member There is no occurrence of breakage between the two (between the elastic member 12A and the elastic member 12B).
Therefore, the machine tool seal 1 can be freely deformed according to the shape of the contact surface on the machine tool side.

Furthermore, the adhesive bond layer 13 which consists of a silicone modified urethane type adhesive agent is excellent in coolant resistance (cutting oil resistance). Specifically, even if the coolant is a so-called oil-based coolant or a water-based coolant, the decrease in performance when contacted with the coolant is extremely small.
Therefore, the machine tool seal 1 can ensure excellent sealing performance for a long time even under a severe use environment.
In the machine tool seal 1, in order to secure such performance, it is important to provide the adhesive layer 13 made of a silicone-modified urethane-based adhesive.

As the silicone-modified urethane-based adhesive, conventionally known silicone-modified urethane-based adhesives can be used.
Specifically, for example, a silicone modified urethane resin which is a reaction product of an isocyanate compound and a polyol compound, and the polyol compound is a polyol compound in which a siloxane bond is introduced into its main chain and / or side chain, If necessary, one containing a curing agent can be used.

The silicone-modified urethane-based adhesive may be a reactive (curable) adhesive or a hot melt (thermoplastic) adhesive, but the reactive (curable) adhesive may be used. Adhesives are preferred.
A reactive adhesive tends to be excellent in adhesion, strength against elongation, etc., and flexibility (stretchability) as compared to a hot melt adhesive. The reason for this is considered that in the adhesive layer made of a reactive adhesive, a cross-linking point is formed by chemical bonding.

A commercial item can also be used as said silicone modified urethane type adhesive agent.
Specifically, for example, a two-component curable silicone-modified urethane adhesive containing Mightylight G3062 (main agent) manufactured by E-Tech and Mightylight MLT 2365 (hardening agent), Resamine PS-62470 (Dainichi Seika Kogyo Co., Ltd. And thermoplastic silicone-modified urethane-based adhesives and the like.
In addition, when using an adhesive containing Mightylight G3062 and Mightylight MLT2365, mixing of 100 to 220 parts by weight of Mightylight MLT2365 with 100 parts by weight of Mightylight G3062 is possible with respect to the mixing ratio of the two. preferable.
The silicone-modified urethane-based adhesive may contain, if necessary, conventionally known various additives which can be added to the urethane-based adhesive.

The hardness of the silicone-modified urethane-based adhesive is preferably 35 to 80 in terms of hardness in the International Rubber Hardness (IRHD) Test M method (hereinafter, also simply referred to as “IRHD hardness (M method)”).
When the IRHD hardness (M method) is in the above range, the adhesive layer made of the silicone-modified urethane adhesive is suitable for maintaining strength while maintaining flexibility (flexibility).
In contrast, the IRHD hardness (M method) 3 5 Not Mitsurude, said adhesive layer may become broken when deformation such as strength insufficient in bending. On the other hand, when the IRHD hardness (M Act) exceeds 8 0, the adhesive layer is deformed and difficult, such as bending, it may sometimes suppress the deformation of the machine tool seal.
More preferably the IRHD hardness (M Act) is 45-7 5.
International Rubber Hardness (IRHD) Test of the Adhesive Layer The hardness of method M is measured by the measurement method specified in ISO 48 or JIS K 6253. At this time, a measurement site | part is 0.5 mm or more in thickness, and selects the location of a plane, and sets the sample temperature at the time of measurement to 23 degreeC.
The hardness of the silicone-modified urethane-based adhesive is the hardness after the silicone-modified urethane-based adhesive is cured (hardened).

  In the machine tool seal 1 shown in FIG. 1, an adhesive layer 13 is formed between the elastic member 12A and the elastic member 12B. Here, the width of the adhesive layer 13 (the distance between the elastic members) is preferably 2 mm or less. If it exceeds 2 mm, peeling in the layer may occur in the adhesive layer 13 during bending. On the other hand, the lower limit of the width of the adhesive layer 13 is not particularly limited, as long as it is a width that can ensure adhesiveness beyond 0 mm, for example, about 0.3 mm.

Furthermore, the machine tool seal of the present invention may have the form shown in FIG. 4 in which the machine tool seal members (elastic members) are joined.
Fig.4 (a) is a perspective view which shows another example of the seal for machine tools of this invention, (b) is a top view of (a).
In the machine tool seal 4 shown in FIGS. 4A and 4B, two machine tool seal members 40A and 40B are joined via an adhesive 43.
Here, the machine tool seal members 40A, 40B are members having the same configuration as the machine tool seal members 10A, 10B shown in FIG. 1, and the end portions of the substantially rectangular metal plate are cut diagonally , Support members 41A and 41B made of processed metal plates obtained by bending along the longitudinal direction (in FIG. 2A, left and right direction), and adhesives (shown in FIG. 2) along the longitudinal direction of the support members 41A and 41B. And plate-like elastic members 42A and 42B fixed by

In the machine tool seal 4, the machine tool seal members 40A and 40B are disposed such that the side cut obliquely with respect to their respective longitudinal directions is opposite and the respective end faces of the elastic members 42A and 42B are in contact with each other. It is done. Furthermore, in the machine tool seal 4, as shown in FIGS. 4A and 4B, the adhesive 43 is applied to the surfaces of the elastic members 42A and 42B in the vicinity of the end surfaces where the elastic members 42A and 42B abut. By bridging the adhesive 43, the elastic member 42A and the elastic member 42B are joined.
In the machine tool seal of the present invention, the machine tool seal members may be joined in this manner.

  In the machine tool seal of the present invention, when the elastic members are adhered to each other by the silicone modified urethane adhesive, as shown in FIG. 1, while forming an adhesive layer between the elastic members, as shown in FIG. An adhesive may be applied also to the surface of the elastic member in the vicinity of the opposite end face of the elastic member as shown in FIG.

Next, constituent members of the machine tool seal member will be described.
As the material of the support member, metal materials such as steel and aluminum are generally suitable in terms of durability and strength, but ceramics and rigid plastics can also be used.
In addition, it is also possible to use a surface-untreated steel plate, a steel plate subjected to surface treatments such as zinc phosphate treatment, chromate treatment and rust-preventing resin treatment, and elastic metal plates such as phosphor bronze and spring steel.
Furthermore, in order to improve the compatibility with the adhesive for fixing the elastic member, the support member may be subjected to surface treatment in advance with a primer such as urethane or silane.
In addition, the surface of the support member (in particular, the region in contact with the elastic member through the adhesive layer) may be roughened to improve adhesion by the anchor effect.
When the shape of the support member is the shape shown in FIGS. 1 and 2, the partition member is not necessarily limited to one produced by bending a single plate-like body, for example, two pieces of The flat plate may be joined at a predetermined angle.

The elastic member is a member that comes into contact with the contact surface on the machine tool side when the machine tool seal 1 is used, and contacts the mating material at the edge portion (12Aa in FIG. 2).
The elastic member is a plate-like member having a rectangular cross section, but the shape of the elastic member is not limited to such a shape, and for example, the edge portion is subjected to C chamfering or R chamfering. It may be a shape, or may be a shape in which the cross-sectional shape (the shape of the surface perpendicular to the longitudinal direction) tapers continuously or intermittently toward the edge portion.

The material used for the elastic member is a machine tool and oil resistance is required. For example, NBR (nitrile butadiene rubber), urethane elastomer, fluoro rubber, silicone rubber, EPDM (ethylene propylene diene rubber) Etc.
Of these, urethane elastomers are preferred. It is because it is excellent in durability (abrasion resistance), and can maintain desired performance over a long period of time.

  Examples of the urethane elastomer include those obtained by reacting a polyol, a polyisocyanate and, if necessary, a crosslinking agent.

It does not specifically limit as said polyol, For example, polyester polyol, polyether polyol, polycaprolactone polyol etc. are mentioned.
The polyol preferably has a number average molecular weight of 1000 to 3,000. By using the polyol within the above range, it is possible to more reliably prevent the intrusion of chips, coolant and the like at the time of contact with the other material.
The said number average molecular weight is a measured value of polystyrene conversion by GPC (gel permeation chromatograph) measurement.

As said polyester polyol, what was obtained by making dicarboxylic acid and glycol react according to a conventional method etc. is mentioned, for example.
Examples of the dicarboxylic acid include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid, aliphatic dicarboxylic acids such as adipic acid, azelaic acid and sebacic acid, and oxycarboxylic acids such as oxybenzoic acid Acids, ester forming derivatives thereof and the like can be mentioned. Among these, adipic acid is preferred from the viewpoint of good abrasion resistance.
Examples of the glycol include aliphatic glycols such as ethylene glycol, 1,4-butanediol, diethylene glycol, neopentyl glycol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, triethylene glycol, and the like. Alicyclic glycols such as 1,4-cyclohexanedimethanol; aromatic diols such as p-xylene diol; polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol; and the like. As said glycol, aliphatic glycol is preferable and ethylene glycol and 1, 4- butanediol are still more preferable.
The polyester polyol which is a reaction product of dicarboxylic acid and glycol has a linear structure but may be a branched polyester using a trivalent or higher ester forming component.

  Examples of the polyether polyol include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and copolymers thereof. Among these, polytetramethylene glycol is preferable in terms of good abrasion resistance.

Examples of the polycaprolactone polyol include those obtained by ring-opening addition of ε-caprolactone using a low molecular weight glycol as an initiator in the presence of a catalyst.
As the low molecular weight glycols, dihydric alcohols such as ethylene glycol, propylene glycol, 1,3-butylene glycol and neopentyl glycol and trihydric alcohols such as trimethylene glycol and glycerin are preferably used. Examples of the catalyst include organic titanium compounds such as tetrabutyl titanate, tetrapropyl titanate and tetraethyl titanate, and tin compounds such as tin octylate, dibutyltin oxide, dibutyltin laurate, stannous chloride, stannous bromide and the like. It is preferably used.
In addition to the above ε-caprolactone, other cyclic lactones such as trimethylcaprolactone and valerolactone may be partially mixed.
The polyols described above may be used alone or in combination of two or more.

  The polyisocyanate is not particularly limited, and conventionally known ones can be used, and examples thereof include aliphatic isocyanate, alicyclic isocyanate, aromatic isocyanate and the like. Among these, aromatic isocyanates are preferred in terms of good abrasion resistance.

Examples of the aliphatic isocyanate include 1,6-hexamethylene diisocyanate (HDI), 2,2,4-trimethylhexamethylene diisocyanate, lysine diisocyanate and the like. Other examples include hexamethylene diisocyanate, isocyanurate of isophorone diisocyanate, biuret, modified form of adduct, and the like.
Examples of the above-mentioned alicyclic isocyanate include alicyclic diisocyanates such as isophorone diisocyanate (IPDI), 4,4'-dicyclohexylmethane diisocyanate, 1,4-cyclohexane diisocyanate, norbornane diisocyanate (NBDI), and the like.
Examples of the aromatic isocyanate include tolylene diisocyanate (TDI), phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate (MDI), 1,5-naphthalene diisocyanate, xylylene diisocyanate (XDI), carbodiimide-modified MDI, urethane Modified MDI and the like can be mentioned.
The said polyisocyanate may be used independently and may use 2 or more types together.

Examples of the crosslinking agent include ethylene glycol, propylene glycol, butanediol, hexanediol, diethylene glycol, trimethylolpropane, glycerin, hydrazine, ethylenediamine, diethylenetriamine, 4,4'-diaminodiphenylmethane, 4,4'-diaminodicyclohexylmethane. , N, N-bis (2-hydroxypropyl) aniline, water and the like.
Among these, butanediol and trimethylolpropane are preferable in terms of good oil resistance.
The above crosslinking agents may be used alone or in combination of two or more.

  The above polyurethane elastomer can be produced by a known method using the above starting materials, for example, using a catalyst as needed in an appropriate organic solvent, and the equivalent ratio of each starting material is NCO / OH = 0.9 It can manufacture by adjusting and adjusting to -1.1, and making it melt-react with no solvent. Moreover, it can manufacture by the method (precursor method) etc. which make all the raw materials react simultaneously (one shot method).

The method for molding the elastic member is not particularly limited, and examples thereof include normal pressure casting, reduced pressure casting, centrifugal molding, continuous rotational molding, extrusion molding, injection molding, reaction injection molding (RIM), spin coating, and the like. Be
Among these, centrifugal molding and continuous rotational molding are preferred.

The hardness (JIS A hardness) of the elastic member is preferably 55 to 90 °.
If the hardness of the elastic member is less than 55 °, the elastic member may be deformed during use, particularly when sliding on the contact surface of the machine tool, and it may not be possible to prevent intrusion of swarf etc. reliably. On the other hand, if it exceeds 90 °, the elastic member is too hard, and may be damaged at the time of sliding. The hardness of the more preferable elastic member is 60 to 75 degrees.
The JIS A hardness is a value measured by a spring type A hardness tester according to JIS K 7312.

Moreover, 10%-50% of the impact resilience of the said elastic member is preferable.
When the elastic member slides on the contact surface of the machine tool, quick response to follow the surface irregularities of the contact surface and performance to prevent generation of noise during sliding are required. Both are in a trade-off relationship, but by setting the resilience of the elastic member in the above range, the above-mentioned contradictory characteristics can be compatible. The more preferable impact resilience is 20% to 40%.
Moreover, the said impact resilience is the value measured based on JISK7312.

The elastic member may further contain a short fiber, whereby the hardness of the elastic member can be adjusted.
As the above-mentioned short fibers, for example, polyamide fibers are preferably used because they are easily compatible with the rubber component (elastomer component).
The short fibers preferably have an aspect ratio of 5 or more and a thickness of about 1 to 10 denier.
When the short fiber is contained, its content is preferably about 1 to 100 parts by weight with respect to 100 parts by weight of the rubber component (elastomer component).

As an adhesive layer for fixing the elastic member to the support member (hereinafter, also referred to as an adhesive layer for elastic member fixation), it is particularly possible if it can bond the elastic member to the support member with sufficient adhesive force. It is not limited and may be selected appropriately in consideration of the materials of the support member and the elastic member.
As the above-mentioned adhesive layer for fixing an elastic member, for example, one formed of an EVA-based, polyamide-based or polyurethane-based hot melt adhesive, a curable adhesive or the like, and further, one formed of a double-sided tape, etc. It can be mentioned.
When the elastic member is made of a urethane elastomer, the elastic member fixing adhesive layer is preferably formed of a urethane-based hot-melt adhesive from the viewpoint of excellent bonding strength between the support member and the elastic member, particularly moisture Preferably, it is formed of a curable urethane-based hot melt adhesive. When a moisture-curable urethane hot melt adhesive is used, the adhesive layer does not melt or soften even when the seal member for a machine tool becomes hot during use, and stable adhesion can be maintained. is there.

The above-mentioned moisture-curable urethane-based hot melt adhesive reacts with moisture adhering to the surface of the elastic member and / or the support member or humidity of the atmosphere after application and adhesion in a molten state, and a crosslinking reaction gradually occurs. An advancing adhesive that contains a urethane prepolymer.
Specifically, for example, those comprising 30 to 50% by weight of a urethane prepolymer (for example, a polycarbonate-based urethane prepolymer), 0 to 70% by weight of a thermoplastic resin, and 0 to 50% by weight of a tackifier It can be used.
The urethane prepolymer has two or more isocyanate groups in the molecule, and reacts with moisture contained in the atmosphere to be cured.
As said thermoplastic resin, saturated polyester etc. are mentioned, for example. The above-mentioned thermoplasticity has a role to increase adhesion by providing crystallinity and a role of a plasticizer to be able to be applied at a temperature of about 120 to 140 ° C. in the above-mentioned moisture-curable urethane-based hot melt adhesive Thus, the moisture-curable urethane-based hot melt adhesive can be made excellent in low-temperature workability.

A commercial item can also be used as said moisture hardening type urethane type hot melt adhesive agent, As a specific example, for example, Tiforce H-810, Tiforce H-850, Tiforce PUR-1S, Tiforce H-910, Tyforce FH-445, Tyforce FH-315SB, Tyforce FH-430, Tyforce FH-00SB (all manufactured by DIC), RHC-101, 5921 (manufactured by No Tape Industrial Co., Ltd.), Hybon 4836M, Hybon 4836S, Hybon 4836W (manufactured by Hitachi Chemical Polymer Co., Ltd.), etc. may be mentioned.
Among these, Tyforce H-810 and Tyforce H-850 are preferable.

The thickness of the elastic member fixing adhesive layer is not particularly limited, but preferably 50 to 500 μm.
When the adhesive layer for fixing an elastic member is made of a hot melt adhesive, its thickness is preferably 50 to 200 μm. If it is less than 50 μm, sufficient adhesive strength may not be secured, while if it exceeds 200 μm, the temperature and time may be excessively long for the melting of the hot melt adhesive.

The machine tool seal of the present invention includes a plurality of machine tool seal members, and at least one of the machine tool seal members is an adhesive comprising at least one other machine tool seal member and a silicone modified urethane adhesive. It is made to join via an agent layer. Therefore, even if the shape required for the machine tool seal is a complicated shape, the desired shape (complex shape) can be easily coped with.
FIG. 5 is a plan view schematically showing another example of the machine tool seal of the present invention.

The machine tool seal 1 ′ shown in FIG. 5 is a machine tool seal provided with five linear machine tool seal members 10 C to 10 G, and both ends of the machine tool seal members 10 C to 10 G In the middle, a region shown by a to e) is joined to another adjacent machine tool seal member by an adhesive layer made of a silicone-modified urethane-based adhesive.
The machine tool seal 1 'is a machine tool seal having a planer shape with an irregular side pentagon, but in the present invention, such a machine tool seal can be easily made using a linear machine tool seal member. Can be provided.
In the machine tool seal of the present invention, as shown in FIG. 5, all the machine tool seal members provided in the machine tool seal are joined with other machine tool seal members using a silicone-modified urethane adhesive. Although not shown, a part of the machine tool seal member provided in the machine tool seal may be joined with another machine tool seal member using a silicone-modified urethane adhesive. Good.

  In the machine tool seal described so far, only the elastic members of the machine tool seal member are joined via the adhesive layer, but in the machine tool seal of the present invention, the machine member seal is used together with the elastic members. The support members of the seal member may also be joined via the adhesive layer.

In the machine tool seal of the present invention, the shape of the machine tool seal member is not limited to the shape shown in FIG. 1, and conventional machine tools such as lip seals, slide seals, telescopic seals, cover seals, etc. What is necessary is just to have the same shape as the sealing member.
Among them, a machine tool seal member having a linear shape as shown in FIGS. 2 and 8 is particularly preferable. Because it is suitable to receive the advantages of the present invention.

Although the machine tool seal shown in FIGS. 1 to 4 is a machine tool seal having a shape suitable for a lip seal, as described above, the machine tool seal of the present invention is a slide seal other than the lip seal. It may be a telescopic seal, a cover seal or the like.
Hereinafter, a telescopic seal employing the machine tool seal of the present invention will be described.
FIG. 6A is a perspective view schematically showing an example of a telescopic cover using the machine tool seal of the present invention, and FIG. 6B is a partially enlarged perspective view of FIG.

The telescopic cover 2 shown in FIG. 6 (a) is provided with a plurality of machine tool seals (telescope seals), and the machine tool seals are designed to have different inner dimensions, and have a structure like a barrel of a telescope and the like. It is arranged in steps to become. Here, the telescopic cover 2 is connected such that the machine tool seals are connected via a connecting member such as a pantograph (not shown), and the telescopic cover 2 is configured such that the whole telescopic cover 2 expands and contracts with the movement of the tool of the machine tool. ing.
In the telescopic cover 2, the elastic member of each machine tool seal is in contact with the upper surface of the support member of the machine tool seal member located in the lower stage, and when the telescopic cover 2 is expanded or contracted, the elastic member is the lower support member. Sliding on the upper surface of the Therefore, swarf and coolant can be prevented from entering the inside of the telescopic cover 2.

The telescopic seal (machine tool seal) 20 constituting the telescopic cover 2 has an adhesive layer in which two machine tool seal members 20A and 20B are made of a silicone modified urethane adhesive as shown in FIG. 6 (b). It is joined via 23.
The machine tool seal members 20A and 20B are both fixed to the support members 21A and 21B obtained by bending the plate-like member, and the support members 21A and 21B via an elastic member fixing adhesive layer (not shown). And the elastic members 22A and 22B.
Then, in the telescopic seal (seal for machine tool) 20, the support members 21A and 21B, and the elastic members 22A and 22B are joined together by the adhesive layer 23.

The telescopic cover 2 provided with the telescopic seal (seal for machine tool) 20 not only plays a role as a telescopic cover for preventing intrusion of chips and coolant, but the seal members 20A and 20B for the machine tool are silicone. Since bonding is performed via the adhesive layer 23 made of a modified urethane-based adhesive, it is possible to easily cope with design change and dimension change of the machine tool.
In the telescopic seal (seal for machine tool) 20, the support members 21A and 21B, and the elastic members 22A and 22B are respectively joined by the adhesive layer 23, but with the machine tool seal member 20A When joining with the machine tool seal member 20B, at least the elastic members 22A and 22B may be joined by the adhesive layer 23.

Next, a method of manufacturing the machine tool seal member including the embodiment of the method of bonding machine tool seal members according to the present invention will be described.
(1) First, a plurality of (required number of) machine tool seal members are prepared. The machine tool seal member may be manufactured by a conventionally known method.

(2) Next, the machine tool seal members are adhered to each other by a silicone-modified urethane adhesive.
At this time, adhesion of the machine tool seal members may be performed only by the elastic members, or may be performed by both the elastic members and the support members.
That is, in the present step (2), the method of bonding sealing members for machine tools of the present invention may be performed.

  Specifically, for example, when the silicone-modified urethane-based adhesive is a two-component curable silicone-modified urethane-based adhesive, one mixture of two components (main agent and curing agent) is prepared, and then one of the two components is prepared. The mixed solution is applied to the end faces of the elastic member (and the support member) or both elastic members (and the support member) facing each other, and the seal members for machine tools are held in a state of being held together. It may be cured under the conditions. In addition, the machine tool seal member is disposed so that a gap is generated between the end faces of the elastic member (and the support member) facing each other, the mixture is poured into the gap, and the mixture is further subjected to predetermined conditions. It may be cured.

  Also, for example, when the silicone-modified urethane-based adhesive is a thermoplastic silicone-modified urethane-based adhesive, the unmelted thermoplastic silicone-modified urethane-based adhesive is heated and melted to form one elastic member (and one The support members) or both elastic members (and support members) may be applied, and then the machine tool seal members may be immediately butted together and held in that state for a predetermined time. In addition, a machine tool seal member is disposed so that a gap is formed between the end surfaces of the elastic member (and the support member) facing each other, and the melted thermoplastic silicone modified urethane adhesive is injected into the gap. You may hold for a while.

Furthermore, for example, the seal member for a machine tool is disposed such that the end surfaces facing each other of the elastic member (and the support member) abut, and then the surface of the elastic member (and the support member) near the end surface The mixed solution of the two-component curable silicone-modified urethane-based adhesive or the molten thermoplastic silicone-modified urethane-based adhesive may be applied, and the seal members for machine tools may be adhered to each other by holding the state.
By going through such a process, the machine tool seal of the present invention can be manufactured.

  Hereinafter, the present invention will be more specifically described by way of examples, but the present invention is not limited to the following examples.

(1) Production of seal member for machine tool Through the following steps, a seal member for machine tool having a shape as shown in FIG. 1 was produced.
(1-1) A urethane composition was prepared by adding 6.36 parts by weight of 1,4-BD and 0.197 parts by weight of TMP to 100 parts by weight of the prepolymer heated to 110 ° C. and stirring and mixing. The urethane composition obtained immediately after is put into a centrifugal molding machine and crosslinked under conditions of a mold temperature of 150 ° C. and a crosslinking time of 60 minutes to form a cylindrical cured product having a thickness of 1.5 mm, and then demolding. did. Thereafter, one portion of the cylindrical cured product was cut and developed into a plate shape, and post-crosslinking was performed in a blowing oven at 110 ° C. for 24 hours to obtain a polyurethane base sheet.
Next, the above-mentioned original fabric sheet was cut into 12 mm long x 49 mm wide to form a strip-like urethane sheet (elastic member). The JIS-A hardness of the urethane sheet was 80 °.
The JIS-A hardness of the urethane sheet was measured in accordance with JIS K 6253 by stacking 10 sheets of a 1.5 mm thick urethane sheet.
The raw materials used here are as follows.
Prepolymer: Sunprene P-6814 (manufactured by Sanyo Chemical Industries, Ltd.)
1, 4-BD: 1, 4- butanediol (made by Mitsubishi Chemical Corporation)
TMP: Trimethylolpropane (Mitsubishi Gas Corporation)
Furthermore, one end of the urethane sheet was cut at an angle of 45 °.

(1-2) A 1.2 mm thick steel plate (Kobezink GX-BX manufactured by Kobe Steel, Ltd.) was cut into 40 mm × 50 mm, and one end of the steel plate was further cut at an angle of 45 °. Thereafter, it was bent in parallel to the long side at a portion of 25 mm from the long side of the longer side to produce a support member.

(1-3) A portion of the surface of the elastic member prepared in (1-1) above is heated to 130 ° C., and a moisture curing type hot melt adhesive (Tyforce H-850 manufactured by DIC Corporation) is 1 mm wide Apply in the form of a bead using an applicator, and make the above (1-2) at a predetermined position of the elastic member coated with the adhesive, and press the support member heated to 120 ° C for 10 seconds did. After releasing the pressure, it was left at room temperature for 12 hours to complete the machine tool seal member in which the elastic member was fixed to the support member via the elastic member fixing adhesive layer having a thickness of 0.2 mm (see FIG. 2) ).

Example 1
Two machine tool seal members prepared by the above-described method were prepared, and the end portions of the machine tool seal members were butted so as to have a 90 ° angled bend by the two machine tool seal members (see FIG. 1).
Separately, 100 parts by weight of Mightylight G3062 (manufactured by E-Tech Co., Ltd.) and 170 parts by weight of Mightylight MLT 2365 (manufactured by E-Tech Co., Ltd.) are put in a polyethylene bag, and the mouth is twisted twice and sealed. The adhesive composition was prepared by mixing by kneading for 40 seconds.
Thereafter, the end of the bag is cut off with scissors to provide an opening having an opening length of about 1 mm, the adhesive composition is squeezed out from this opening, applied to the gap between the end faces of the butted elastic members, and held for 120 minutes By doing this, the elastic members of the two machine tool seal members are adhered to each other, and a machine tool seal in which the two machine tool seal members are joined via the adhesive layer is manufactured.
The size of the adhesive layer formed in the gap between the end faces of the elastic members butted together is 2 mm in thickness × 15 mm in length.

(Example 2)
A machine tool seal was produced in the same manner as in Example 1 except that the blending amount of Mightylight MLT 2365 was changed to 200 parts by weight.

(Example 3)
A machine tool seal was produced in the same manner as in Example 1 except that the blending amount of Mightylight MLT 2365 was changed to 120 parts by weight.

(Example 4)
As an adhesive composition, what heat-melted RESAMIN PS-62470 (made by Dainichi Seika Kogyo Co., Ltd.) in 160 degreeC blowing oven is used, and this adhesive composition is an end surface of an elastic member by metal spatula. The machine tool seal was produced in the same manner as in Example 1 except that the end faces of the elastic members coated with the adhesive composition were immediately butted to adhere the elastic members.

(Example 5)
A machine tool seal was produced in the same manner as in Example 1 except that the blending amount of Mightylight MLT 2365 was changed to 230 parts by weight.

(Example 6)
A machine tool seal was produced in the same manner as in Example 1 except that the blending amount of Mightylight MLT 2365 was changed to 90 parts by weight.

(Comparative example 1)
A seal for a machine tool was produced in the same manner as in Example 4 except that as the adhesive composition, one obtained by heat-melting Tiforce H-850 (manufactured by DIC Corporation) in a 130 ° C. blowing oven was used.

(Comparative example 2)
G17 (manufactured by Konishi) is used as the adhesive composition, and the adhesive composition is applied to the end face of the elastic member with a metal spatula, and then the end faces of the elastic member to which the adhesive composition is applied The machine tool seal was produced in the same manner as in Example 1 except that the elastic members were adhered to each other by holding them for 120 minutes.

(Comparative example 3)
Instead of applying the adhesive composition, a sheet made of EVA, Elfan UH-204 (made by Nippon Mata Co., Ltd., 0.1 mm thick) is cut out to a necessary size, and this is an elastic member which is butted. In the same manner as in Example 1 except that the elastic members were adhered by holding them in the end face and putting them in an oven at 150 ° C. to melt the adhesive and then taking out and cooling them. A machine tool seal was produced.

(Comparative example 4)
PM165 (made by Cemedine) is used as an adhesive composition, this adhesive composition is squeezed out and applied to the end face of the elastic member at room temperature, and the end faces of the elastic member coated with the adhesive composition are butted. A machine tool seal was produced in the same manner as in Example 1 except that the elastic members were adhered to each other by holding for 12 hours.

(Evaluation)
(1) International rubber hardness (IRHD) test Hardness by M method (IRHD hardness (M method))
The IRHD hardness (M method) after adhesion of the adhesive composition used in Examples and Comparative Examples was measured by the following method.
It was measured using an IRHD micro rubber hardness tester manufactured by Hilde Brand. The hardness measurement sample was prepared by separately curing the adhesive so that the thickness at the measurement position was 0.5 mm or more.
The results are shown in Table 1.

(2) Bending property The machine tool seal of the shape shown in FIG. 1 prepared in the example and the comparative example is bent as shown in FIG. 3 and then returned to the original state under the following conditions to break the joint The presence or absence of was visually confirmed and evaluated by the following criteria. The results are shown in Table 1.
(conditions)
Bending amount: 180 ° Bending frequency: 10 times Bending speed: 1 second / time (evaluation criteria)
◎: No damage to the adhesive layer and the elastic member.
Good: A part of the adhesive layer or a part of the interface between the adhesive layer and the elastic member is broken.
X: breakage (cracking) occurs in the entire adhesive layer, or peeling between the adhesive layer and the elastic member.

(3) Stretchability With respect to the machine tool seal of the shape shown in FIG. 1 manufactured in the embodiment and the comparative example, each of the machine tool seal members 10A and 10B is pulled in the longitudinal direction of each machine tool seal member. The adhesive layer was stretched by the above-described method, and then subjected to the following treatment to restore the adhesive layer under the following conditions. The results are shown in Table 1.
(conditions)
Stretching amount: 1 mm
Number of times of extension: 10 times Extension speed: 1 second / time (Evaluation criteria)
◎: No damage to the adhesive layer and the elastic member.
Good: A part of the adhesive layer or a part of the interface between the adhesive layer and the elastic member is broken.
X: Cracking occurs in the entire adhesive layer, or the adhesive layer and the elastic member peel off.

(4) Adhesive strength In this evaluation, after obtaining the polyurethane original fabric sheet using the method adopted at the process of (1-1) of preparation of the sealing member for machine tools mentioned above, this original fabric The sheet was cut to prepare a strip-shaped urethane sheet of thickness 1.5 mm × width 10 mm × length 80 mm.
Thereafter, using the produced urethane sheet, as shown in FIG. 7A, a part of the two urethane sheets 32A and 32B is bonded using the adhesive composition used in each example / comparative example Then, it was left to stand at room temperature for 1 day, and was used as a measurement sample in which two urethane sheets 32A and 32B were joined by the adhesive layer 33.
The adhesive layer was formed over the entire width direction from the one end to a position of 30 mm (see A in FIG. 7A) in the length direction of the urethane sheet.
Next, using the produced measurement sample, the adhesive strength of the adhesive layer was measured by the following method.
In order to achieve the object of the present invention, it is necessary that the adhesive strength be approximately 1 N / cm or more in the evaluation of the adhesive strength.

(4-1) Initial Adhesive Strength Both ends of the non-bonded part of the urethane sheets 32A and 32B of the measurement sample were pulled at a speed of 20 mm / min (see FIG. 7B), and the adhesive strength of the adhesive layer was measured. The results are shown in Table 1.

(4-2) Adhesion after immersion in oil-based coolant After immersing the above measurement sample in oil-based coolant under the following conditions, it is taken out and wiped off the coolant, and then the adhesive strength is obtained by the same method as in (4-1) above. Was measured. The results are shown in Table 1.
(Immersion conditions)
Coolant: Idemitsu Daphne Marg Plus MP10 (made by Idemitsu Kosan Co., Ltd.)
Immersion temperature: 50 ° C
Immersion time: 260 hours

(4-3) Adhesion after immersion in water-based coolant After immersing the above-mentioned measurement sample in water-based coolant under the following conditions, it is taken out and wiped off the coolant, and then the adhesion strength is measured by the method in the same manner as in (4-1) above. did. The results are shown in Table 1.
(Immersion conditions)
Coolant: Neos Clearcut R-H-10PA 10-fold diluted (Neos Co.)
Immersion temperature: 50 ° C
Immersion time: 260 hours

  As shown in Table 1, in the machine tool seal of the present invention, since the machine tool seal members (elastic members) are joined together by the silicone modified urethane adhesive, the flexibility (stretchability) and the resistance are improved. Excellent coolantability.

DESCRIPTION OF SYMBOLS 1, 1 ', 4, 20 Machine tool seal 2 Telescopic cover 10A-10I, 20A, 20B, 40A, 40B Machine tool seal member 11A, 11B, 21A, 21B, 41A, 41B Support member 12A, 12B, 22A, 22B, 42A, 42B Elastic members 13, 23 Adhesive layer 32A, 32B Urethane sheet 43 Adhesive

Claims (5)

A sealing method for a machine tool seal member, comprising bonding a seal member for a machine tool comprising a support member and an elastic member integrated with the support member,
A method of bonding a seal member for a machine tool, comprising adhering at least the elastic members of the seal member for a machine tool with a silicone-modified urethane-based adhesive.   The method according to claim 1, wherein the silicone-modified urethane-based adhesive is a two-component curable silicone-modified urethane-based adhesive. A machine tool seal comprising a plurality of machine tool seal members comprising a support member and an elastic member integrated with the support member, wherein
At least one of the machine tool seal members is bonded to at least one of the other machine tool seal members by a silicone-modified urethane adhesive.
The seal for a machine tool, wherein the silicone-modified urethane-based adhesive bonds at least the elastic members. The hardness of the silicone-modified urethane-based adhesive, machine tools seal of claim 3 hardness in international rubber hardness (IRHD) Test Method M is 35-8 0.   The seal for machine tools according to claim 3 or 4, wherein the silicone-modified urethane-based adhesive is a two-component curable silicone-modified urethane-based adhesive.