JP2017189863A - Seal member for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member for a machine tool which has excellent sealability and which can be manufactured at a low cost.SOLUTION: A seal member for a machine tool comprising a tabular bearing member and a tabular elastic member fixed to the bearing member by an adhesive layer, in which a thickness of the elastic member is 0.8 to 4.5 mm, a side face of the tabular elastic member is brought into contact with a mating member, the side face slidingly contacting the mating member projects from the bearing member, a projection length of the side face slidingly contacting the mating member from an outer edge is 1.5 to 10 mm, and a difference between a projection length of a face on a side facing the bearing member and a projection length of a face on a side opposite to the side facing the bearing member is 0.55 mm or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a machine tool seal member.

Machine tools such as lathes and machining centers are the most basic mechanical devices widely used in the manufacturing industry. In these machine tools, the drive mechanism is protected from chips, coolant (cutting oil), etc. In order to remove the coolant, various seal members (sometimes referred to as wiper members) such as a lip seal, a slide seal, a telescopic seal, and a cover seal are used.
The sealing member for machine tools is usually composed of a supporting member and an elastic member integrated with the supporting member, and is used by pressing the elastic member against a predetermined position of the machine tool.
At this time, the surface on which the machine tool seal member of the machine tool contacts has various shapes, and the machine tool seal member is attached so that no gap is generated in accordance with the shape of the contact surface on the machine tool side. There is a need.
Therefore, in order to seal a contact surface having a complicated shape that is difficult to cope with only with a linear machine tool seal member, a machine tool seal member having a C-shaped or Z-shaped plan view is provided. It has been proposed (see, for example, Patent Document 1).
Since such a machine tool seal member has a shape corresponding to the shape of the contact surface in the machine tool, it has excellent sealing properties.

JP 2010-12537 A

However, since the sealing member for a machine tool having a C-shaped or Z-shaped plan view disclosed in Patent Document 1 is manufactured by integrally molding a support member and an elastic member in a mold, It is necessary to prepare a mold for each sealing member, and an increase in manufacturing cost cannot be avoided, and it has not been possible to easily cope with dimensional changes.
In this regard, although the invention described in Patent Document 1 aims to reduce the number of molds by making the molds common, there is no change in the point that the molds are required, and the above problems are not solved. It was not a fundamental solution.

  The present inventors have intensively studied to solve such a problem, and if it is a sealing member for a machine tool in which a plate-like support member and a plate-like elastic member are integrated, it can be manufactured at low cost. In addition, the present inventors have found that excellent sealing performance can be ensured by setting the shape of the protruding portion of the elastic member from the support member to a predetermined shape, thereby completing the present invention.

A machine tool seal member of the present invention is a machine tool seal member comprising a plate-like support member and a plate-like elastic member fixed to the support member via an adhesive layer,
The thickness of the elastic member is 0.8 to 4.5 mm,
In sliding contact with the mating member on the side surface of the plate-like elastic member,
The side surface that is in sliding contact with the mating member protrudes from the support member,
The protruding length from the outer edge of the supporting member on the side surface that is in sliding contact with the mating member is 1.5 to 10 mm, and the protruding length of the surface on the side facing the supporting member is opposed to the supporting member. The difference between the protruding length of the opposite side surface and the opposite side surface is 0.55 mm or less.

In the sealing member for a machine tool, the elastic member has a predetermined thickness, and a protruding length of the elastic member from the support member is set within a predetermined range. Further, the support member of the elastic member Since the difference between the protruding length of the surface on the opposite side to the protruding length of the surface opposite to the side facing the support member is within a predetermined range, excellent sealing performance can be exhibited.
In addition, since the machine tool seal member can be manufactured without using a mold, it can be suitably adapted to the design change of the machine tool seal member and the manufacture of a large variety of small quantity products. Cost can also be reduced.

  In the sealing member for machine tools, the elastic member preferably contains a low μ agent. Also in this case, the sliding resistance with the counterpart member can be reduced.

  In the sealing member for machine tools, the elastic member is preferably made of thermosetting polyurethane. Since the elastic member made of thermosetting polyurethane is excellent in durability, the sealing member for machine tools provided with the elastic member can maintain excellent sealing properties over a long period of time.

  The sealing member for machine tools of this invention is excellent in sealing performance, and can be manufactured at low cost.

(A) is a top view which shows the sealing member for machine tools which concerns on 1st Embodiment, (b) is the AA line end view of (a). It is a top view which shows separately the support member and elastic member which comprise the sealing member for machine tools shown in FIG. It is sectional drawing which shows the state which attached the sealing member for machine tools shown in FIG. 1 to the machine tool. It is a principal part expanded sectional view of the sealing member for machine tools shown in FIG. It is sectional drawing for demonstrating the method to evaluate the sliding resistance of the sealing member for machine tools produced in the Example and the comparative example. It is sectional drawing for demonstrating the method of evaluating the sealing performance and durability of the sealing member for machine tools produced in the Example and the comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
Fig.1 (a) is a top view which shows the sealing member for machine tools which concerns on this embodiment, (b) is the AA line end view of (a). FIG. 2 is a plan view showing separately a support member and an elastic member that constitute the machine tool seal member shown in FIG. 1. FIG. 3 is a cross-sectional view showing a state where the machine tool seal member shown in FIG. 1 is attached to the machine tool. 4 is an enlarged cross-sectional view of a main part of the machine tool seal member shown in FIG.

As shown in FIGS. 1A, 1 </ b> B, and 2, the machine tool seal member 10 according to the present embodiment is a polygonal shape having a plurality of bent portions and refracting portions in plan view, and has a plate shape. The support member 11 includes a plate-like elastic member 12 having a shape in plan view similar to that of the support member 11. The elastic member 12 is fixed to the support member 11 via the adhesive layer 13.
The elastic member 12 is fixed to the support member 11 such that a side surface (hereinafter also referred to as a sliding contact side surface) that is in sliding contact with a mating member such as the side surface 12A in FIG. 1B protrudes from the outer edge 11A of the support member 11. Yes.

Here, the protrusion length L1 (refer FIG.1 (b)) of the elastic member 12 from the support member 11 is 1.5-10.0 mm.
When the protrusion length L1 exceeds 10.0 mm, a gap is generated between the sliding surface of the mating member when sliding with the mating member in the machine tool, and the sealing performance is impaired. On the other hand, if the L1 is less than 1.5 mm, the sliding resistance with the mating member becomes too large. As a result, there may be problems such as chattering noise during sliding, a load on the motor that moves (slides) the machine tool sealing member, and an increase in power consumption.
The protrusion length L1 is preferably 3.5 to 7.5 mm.

In the machine tool seal member 10, the elastic member 12 has a thickness L2 (see FIG. 4) of 0.8 to 4.5 mm.
If the thickness L2 exceeds 4.5 mm, the sliding resistance with the mating member becomes too large. As a result, problems such as chattering noise and increased power consumption may occur during sliding. On the other hand, when the thickness L2 is less than 0.8 mm, a gap is generated between the sliding surface of the mating member when the mating member slides, and the sealing performance is impaired.
The thickness L2 is preferably 1.2 to 2.5 mm.

In the elastic member 12, the ratio (projection length L1 / thickness L2) to the projection length L1 with respect to the thickness L2 is preferably 0.8 to 8.0.
If it is this range, it can avoid that sliding resistance with an other member becomes high too much, ensuring the outstanding sealing performance.

As an example, the machine tool seal member 10 is attached to a mounting portion 1 in a machine tool using bolts 14 and nuts 15 as shown in FIG.
At this time, the machine tool seal member 10 is attached so that the elastic member 12 is pressed perpendicularly to the sliding surface 2 a of the counterpart member 2. Thereby, since the elastic member 12 slides in a state where the entire sliding contact side surface 12A is in contact with the sliding surface 2a of the mating member 2, it is possible to ensure excellent sealing performance.

The sliding contact side surface 12 </ b> A of the elastic member 12 with the mating member 2 is shaped so that the entire sliding contact side surface 12 </ b> A can contact the mating member 2 by pressing the elastic member 12 against the sliding surface 2 a of the mating member 2. The angle formed between the sliding contact side surface 12A and the front surface 12B and the back surface 12C of the elastic member 12 may be a right angle or may not be a right angle.
That is, as shown in FIG. 4, a protrusion length L1a of the front (front) surface (surface opposite to the support member 11) 12B of the elastic member 12 from the outer edge 11A of the support member 11, and the elastic member 12 The back surface (surface on the support member 11 side) 11C may be different from the protruding length L1b from the outer edge 11A of the support member 11.
Such an elastic member 12 having different projecting lengths L1a and L1b avoids an increase in sliding resistance when the sliding contact side surface 12A is slid against the sliding surface 2a of the mating member 2. However, it is effective to ensure sealing performance.

When the projection lengths L1a and L1b are different, the difference L3 between them is 0.55 mm or less. When the L3 exceeds 0.55 mm, it becomes difficult to slide the entire sliding contact side surface 12A of the elastic member 12 against the sliding surface 2a of the mating member 2, and as a result, the sealing performance is impaired. .
The L3 is preferably 0.08 to 3.0 mm from the viewpoint of ensuring the sealing performance while reducing the sliding resistance with the counterpart member 2.
In the case where the protruding lengths L1a and L1b are different, either of them may be longer.
When the protruding lengths L1a and L1b are different, the sliding contact side surface 12A may be a flat surface, a curved surface, or a combination of both.

  The sealing member for machine tools of this embodiment has a sliding contact side surface according to the shape of the mating member in a machine tool, and is excellent in sealing performance.

(Other embodiments)
In the sealing member for machine tools according to the embodiment of the present invention, the elastic member contains an additive composed of an inorganic component (hereinafter also referred to as a low μ agent) for reducing the sliding resistance of the elastic member. It may be. The elastic member can reduce the sliding resistance with the counterpart member by containing the above-mentioned low-mudizing agent.
Examples of the above-mentioned reducing agent include particles made of metal oxides such as cerium oxide, zinc oxide, iron oxide, and silica, metals such as copper, nickel, iron, and aluminum; glass balloons, fly ash balloons, etc. Examples thereof include hollow particles mainly composed of silica; short fibers made of metal such as aluminum, stainless steel, and iron, and short fibers made of resin such as polyamide.
As the above-mentioned reducing agent, metal oxide particles are preferable and cerium oxide particles are more preferable because they are easily compatible with the rubber component (elastomer component) and are chemically stable.

When the elastic member contains the low-mudizing agent, the low-mudizing agent is preferably dispersed throughout the surface direction of the elastic member. The reason for this will be described later.
When the elastic member contains the low μ agent dispersed in the entire surface direction, the compounding amount of the low μ agent is 1.8 to 15 parts by weight with respect to 100 parts by weight of the rubber component (elastomer component). preferable.
When the blending amount of the low-mudizing agent is less than 1.8 parts by weight, the effect of containing the low-mudizing agent (reduction effect of sliding resistance) is not so much obtained. On the other hand, when the amount exceeds 15 parts by weight, the low-muting agent tends to fall off from the elastic member during sliding, and as a result, durability may be lowered.
A more preferable blending amount of the above-mentioned reducing agent is 1.8 to 9.5 parts by weight with respect to 100 parts by weight of the rubber component (elastomer component).

As the planar view shape of the machine tool seal member according to the embodiment of the present invention, any shape can be adopted as long as it can slide appropriately with the sliding surface of the counterpart member. Therefore, the shape in plan view need not be a shape surrounded only by straight lines, and may be a shape surrounded by straight lines and curves, or a shape surrounded only by curves.
One of the technical features of the present invention is that an arbitrary shape (an irregular shape) other than a standard shape such as a linear shape or an L shape may be easily adopted as a planar view shape. That is, according to the machine tool seal member of the present invention, various shapes of machine tool seal members corresponding to the shape of the sliding surface of the mating member can be manufactured at low cost, and excellent sealing properties can be obtained. It can be secured.

  In the machine tool seal member according to the embodiment of the present invention, the protruding length of the sliding contact side surface of the elastic member is not necessarily the same length in the entire machine tool seal member. For example, portions that slide with the mating member on different planes (for example, 12X, 12Y, and 12Z in FIG. 1A) can project properly if they can slide appropriately with the sliding surface of the mating member. It may have a length.

Next, components of the machine tool seal member will be described.
(Support member)
The support member is a plate-like member for securely attaching the machine tool seal member to the machine tool while supporting the elastic member.
The material of the support member is generally a metal material such as steel or aluminum from the viewpoint of durability or strength, but may be ceramic or rigid plastic.
As the support member, a steel plate without surface treatment, a steel plate subjected to surface treatment such as zinc phosphate treatment, chromate treatment, rust prevention resin treatment, elastic metal plate such as phosphor bronze or spring steel, or the like can be used. .
The support member may be subjected to a surface treatment with a primer or the like in order to improve compatibility with an adhesive layer interposed between the support member and the elastic member.
Further, the surface of the support member (particularly, the region in contact with the elastic member via the adhesive layer) may be subjected to a roughening treatment to improve adhesion by an anchor effect.

(Elastic member)
The elastic member is a plate-like member that is in sliding contact with the sliding surface in the machine tool when the machine tool seal is used, and contacts the sliding surface in the machine tool at the sliding contact side surface.
The material of the elastic member is a machine tool, and oil resistance is required. For example, NBR (nitrile butadiene rubber), urethane elastomer, fluorine rubber, silicone rubber, EPDM (ethylene propylene diene rubber) Etc.
Of these, urethane elastomers are preferred. This is because the durability (abrasion resistance) is excellent and the desired performance can be maintained over a long period of time.

  Examples of the urethane elastomer include those obtained by reacting polyol, polyisocyanate, and, if necessary, a crosslinking agent. The urethane elastomer may be thermosetting or thermoplastic, but is preferably a thermosetting urethane elastomer (thermosetting polyurethane).

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 3000. By using a polyol within the above range, it is possible to more reliably prevent intrusion of chips, coolant, etc. during use.
The number average molecular weight is a measured value in terms of polystyrene by GPC (gel permeation chromatograph) measurement.

Examples of the polyester polyol include those obtained by reacting dicarboxylic acid and glycol according to a conventional method.
Examples of the polyether polyol include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and the like.
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.

  It does not specifically limit as said polyisocyanate, A conventionally well-known thing can be used, For example, aliphatic isocyanate, alicyclic isocyanate, aromatic isocyanate etc. are mentioned. Of these, aromatic isocyanates are preferred from the viewpoint of good wear resistance.

  The polyurethane elastomer can be produced by a known method using the above raw materials. For example, a catalyst is used in an appropriate organic solvent as necessary, and the equivalent ratio of each raw material is NCO / OH = 0.9. It can manufacture by adjusting to -1.1 and making it react, making it melt-react without a solvent. Moreover, it can manufacture by the method (one-shot method), the prepolymer method, etc. which react all the raw materials simultaneously.

As said urethane elastomer, the hardened | cured material (thermosetting polyurethane) of the thermosetting urethane composition containing a polyol component, an isocyanate component, and a crosslinking agent is preferable.
The thermosetting urethane composition is particularly preferably a thermosetting urethane composition in which the polyol component is polyethylene adipate ester polyol (PEA).
A sealing member for machine tools provided with an elastic member made of a cured product of a thermosetting urethane composition whose polyol component is PEA is unlikely to swell or dissolve due to coolant. Therefore, when used in a machine tool that uses coolant, the required characteristics can be satisfied over a long period of time even if it is exposed to the coolant.
The number average molecular weight of the PEA is preferably 1000 to 3000 from the viewpoint that it is possible to more reliably prevent intrusion of chips, coolant, and the like during use.

The said thermosetting urethane composition contains an isocyanate component and a crosslinking agent other than PEA (polyol component).
It does not specifically limit as said isocyanate component, For example, aliphatic isocyanate, alicyclic isocyanate, aromatic isocyanate etc. are mentioned.

Examples of the aliphatic isocyanate include 1,6-hexamethylene diisocyanate (HDI), 2,2,4-trimethylhexamethylene diisocyanate, and lysine diisocyanate. In addition, isocyanurate bodies, biuret bodies and modified adduct bodies of hexamethylene diisocyanate and isophorone diisocyanate are also included.
Examples of the alicyclic isocyanate include alicyclic diisocyanates such as isophorone diisocyanate (IPDI), 4,4′-dicyclohexylmethane diisocyanate, 1,4-cyclohexane diisocyanate, and norbornane diisocyanate (NBDI).

Examples of the aromatic isocyanate include tolylene diisocyanate (TDI), phenylene diisocyanate, 4,4′-diphenylmethane diisocyanate (MDI), 1,5-naphthalene diisocyanate (NDI), xylylene diisocyanate (XDI), and carbodiimide-modified. Examples thereof include MDI and urethane-modified MDI.
These isocyanate components may be used independently and may use 2 or more types together.
As said isocyanate component, MDI and NDI are preferable. This is because, among aromatic isocyanates, particularly excellent wear resistance is exhibited.

Examples of the crosslinking agent include 1,4-butanediol (1,4-BD), 1,4-bis (β-hydroxyethoxy) benzene (BHEB), ethylene glycol, propylene glycol, hexane diol, diethylene glycol, triethylene glycol, and the like. Methylolpropane (TMP), glycerin, 4,4′-methylenebis (2-chloroaniline), hydrazine, ethylenediamine, diethylenetriamine, 4,4′-diaminodiphenylmethane, 4,4′-diaminodicyclohexylmethane, N, N-bis ( 2-hydroxypropyl) aniline, water and the like.
Among these, 1,4-butanediol, TMP, and BHEB are preferable because appropriate rubber hardness and rubber rigidity are easily expressed. Moreover, the thermosetting urethane composition containing 1,4-butanediol, TMP, and BHEB has a relatively long pot life and can be molded by hand casting.
The said crosslinking agent may be used independently and may be used together 2 or more types.

  The thermosetting urethane composition may further contain a chain extender, a reaction aid such as a crosslinking accelerator and a crosslinking retarder, a hydrolysis inhibitor, and the like as necessary.

It is preferable that the isocyanate group density | concentration in the said thermosetting urethane composition is 5.50-10.0 weight%. In this case, it is possible to make the elastic member excellent in wear resistance while avoiding an increase in sliding resistance due to the hardness of the cured product becoming too high.
The said isocyanate group density | concentration (weight%) means the weight ratio of the isocyanate group contained in the total amount of an isocyanate component, a polyol component, and a crosslinking agent.

The curing conditions for the thermosetting urethane composition are not particularly limited, and may be set as appropriate for the thermosetting urethane composition according to the composition. Usually, the conditions for heating at 100 to 160 ° C. for 30 to 90 minutes are used. Can be adopted.
Moreover, after performing a hardening process on the said conditions and removing from a metal mold | die etc., you may postcure on the conditions for 3 to 48 hours, for example at 100-160 degreeC.
In addition, the isocyanate component and the polyol component contained in the thermosetting urethane composition may be preliminarily reacted to form a prepolymer before the thermosetting urethane composition is cured under predetermined conditions.

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), and spin coating. It is done.
Among these, centrifugal molding and continuous rotational molding are preferable.
In addition, when the elastic member is formed by centrifugal molding or the like, a raw material composition such as a thermosetting urethane composition may be added in a plurality of times.
In particular, when producing an elastic member containing the above-mentioned low-mudizing agent, the low-mudizing agent may be unevenly distributed on one side due to centrifugal force or its own weight during molding, but the raw material composition is divided into multiple times. By introducing it, it is possible to mitigate the uneven distribution of the low μ agent.

The elastic member preferably has a hardness (JIS A hardness) of 55 to 90 °.
If the hardness of the elastic member is less than 55 °, it may be deformed at the time of sliding, and it may not be possible to sufficiently prevent the entry of chips and the like, while if it exceeds 90 °, the elastic member is too hard, It may be damaged when sliding. A more preferable hardness of the elastic member is 60 to 75 °.
The JIS A hardness is a value measured by a spring type A hardness tester according to JIS K 7312.

  Moreover, when employ | adopting the hardened | cured material of the said thermosetting urethane composition as said elastic member, from a viewpoint of ensuring the tolerance with respect to a coolant, the said JIS-A hardness is preferable 67 degrees or more, 70-85 degrees. Is more preferable.

  The elastic member is, for example, a hydrolysis inhibitor, a colorant such as a pigment, a light stabilizer, a heat stabilizer, an antioxidant, an antifungal agent, a flame retardant, an extender, etc. May be contained.

(Adhesive layer)
It does not specifically limit as said adhesive bond layer, What is necessary is just to select suitably in consideration of the material of each member.
Examples of the adhesive layer include EVA, polyamide or polyurethane hot melt adhesives, those formed with curable adhesives, and those formed with double-sided tape.
Although the thickness of the said adhesive bond layer is not specifically limited, 50-500 micrometers is preferable.

Next, the manufacturing method of the said machine tool seal member is demonstrated.
The machine tool seal member is manufactured by separately preparing the support member 11 and the elastic member 12 as shown in FIG. 2 and then bonding them together in a predetermined positional relationship via the adhesive layer 13. be able to.
The support member 11 can be produced by cutting a steel plate or the like into a predetermined shape.
The elastic member 12 can be produced by cutting a sheet-like material made of thermosetting polyurethane or the like into a predetermined shape.
The machine tool seal member can be manufactured by such a method. Therefore, when the low-mudizing agent is dispersed in the elastic member, as described above, the entire surface direction of the elastic member (sheet-like material) is used. It is preferable to disperse the low μ agent. This is because, when the sheet-like material is cut into a predetermined shape, a low-mudging agent is always present on the sliding contact side surface.

A sealing member for a machine tool according to an embodiment of the present invention is a sealing member (wiper member) for protecting a machine tool operating portion, a drive mechanism, and the like from chips, coolant, and the like in various machine tools such as a lathe and a machining center. ) Can be used. Specifically, the sealing member for machine tools can be used as, for example, a lip seal, a slide seal, a telescopic seal, a cover seal, and the like.
The machine tool seal member according to the embodiment of the present invention is particularly suitable as a slide seal.

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

(Production of support member and elastic member)
Production of Support Member A steel plate having a thickness of 0.8 mm (manufactured by Kobe Steel, Ltd., Green Coat GX-K2) was cut with a turret punch to produce a support member having the shape shown in FIG.

Production of Elastic Member Urethane sheets A1 to A7 and B1 to B7 and NBR sheets C1 to C8 were produced by the following method. Thereafter, each sheet was cut into a predetermined size and shape to produce an elastic member. Here, according to Examples 1 to 26 and Comparative Examples 1 to 8 which will be described later, the difference between the protruding length from the supporting member and the protruding length from the supporting member is the dimensions shown in Tables 1 to 3. The elastic member was cut. In addition, cutting of each sheet is performed by a water jet when producing elastic members (Examples 1 to 9 and 15 to 26 / Comparative Examples 1 to 6) having no difference in protrusion length, and there is a difference in protrusion length. When producing a certain elastic member (Examples 10-14 / Comparative Examples 7-8), it was performed with a Thomson blade.

(Production of urethane sheet A1)
MDI-PEA prepolymer heated to 110 ° C. (manufactured by Sanyo Chemical Industries, trade name “Samprene P-6814”) 100.00 parts by weight, 6.36 parts by weight of 1,4-BD (Mitsubishi Chemical Corporation) And 0.20 parts by weight of TMP (Mitsubishi Gas Co., Ltd.) and 10.00 of a black pigment master batch (manufactured by Dainichi Seika Kogyo Co., Ltd., trade name “VT BD1008”), and stirred and mixed to obtain urethane composition A. Prepared.
Next, the obtained urethane composition A is put into a centrifugal molding machine and crosslinked under conditions of a mold temperature of 150 ° C., a rotation speed of 900 rpm, and a crosslinking time of 60 minutes, and a cylindrical cured product having a thickness of 1.6 mm is obtained. After molding, the mold was removed. Thereafter, one portion of the cylindrical cured product was cut and developed into a plate shape, followed by post-crosslinking in a blower oven at 110 ° C. for 24 hours, to produce a urethane sheet A1.

(Production of urethane sheet A2)
Except for changing the input amount of the urethane composition A, a urethane sheet A2 having a thickness of 0.8 mm was produced in the same manner as the production of the urethane sheet A1.

(Production of urethane sheets A3 to A7)
Except for changing the input amount of the urethane composition A, urethane sheets A3 to A7 having different thicknesses were prepared in the same manner as the urethane sheet A1. The thicknesses of the urethane sheets A3 to A7 are as follows.
Urethane sheet A3: 1.2mm
Urethane sheet A4: 2.5mm
Urethane sheet A5: 4.5mm
Urethane sheet A6: 0.6mm
Urethane sheet A7: 5.0mm

(Production of urethane sheet B1)
MDI-PEA prepolymer heated to 110 ° C. (manufactured by Sanyo Chemical Industries, trade name “Samprene P-6814”) 100.00 parts by weight, 6.36 parts by weight of 1,4-BD (Mitsubishi Chemical Corporation) And 0.20 parts by weight of TMP (manufactured by Mitsubishi Gas Co., Ltd.), black pigment masterbatch (manufactured by Dainichi Seika Kogyo Co., Ltd., trade name “VT BD1008”), 10.00, cerium oxide powder (manufactured by Taiyo Mining Co., Ltd., The urethane composition B was prepared by adding 7.0 parts by weight of Celico CH-BS302) and stirring and mixing.
Next, the obtained urethane composition B is put into a centrifugal molding machine and crosslinked under conditions of a mold temperature of 150 ° C., a rotation speed of 900 rpm, and a crosslinking time of 50 minutes, and a cylindrical cured product having a thickness of 1.6 mm is obtained. After molding, the mold was removed. Thereafter, one part of the cylindrical cured product was cut and developed into a plate shape, and post-crosslinked under conditions of 110 ° C. and 24 hours in a blower oven to produce a urethane sheet B1.

(Production of urethane sheet B2)
A urethane sheet B2 having a thickness of 1.6 mm was prepared in the same manner as the urethane sheet B1 except that the urethane composition B was divided into three times and charged into a centrifugal molding machine and subjected to centrifugal molding under the following conditions.
The amount of the urethane composition B introduced was set to an amount that would result in a thickness of 0.5 mm (first and third times) and an amount that would result in a thickness of 0.6 mm (second time). The molding conditions were set such that the mold temperature was 150 ° C., the rotation speed was 900 rpm, the crosslinking time was 50 minutes, and the urethane composition B was charged for 10 minutes.

(Production of urethane sheet B3)
The urethane composition B is poured into a plate-shaped casting mold, molded under conditions of a mold temperature of 150 ° C. and a crosslinking time of 50 minutes, and then subjected to post-crosslinking under the same conditions as the production of the urethane sheet B1. A 1.6 mm-long urethane sheet B3 was produced.

(Production of urethane sheets B4 to B7)
Urethane sheets B4 to B7 were produced in the same manner as the urethane sheet B1, except that the urethane composition Ba to the urethane composition Bd in which the cerium oxide powder in the urethane composition B was changed as follows were used.
Urethane sheet B4: It was prepared using a urethane composition Ba having a blending amount of cerium oxide powder of 2.0 parts by weight.
Urethane sheet B5: It was prepared using a urethane composition Bb in which the blending amount of the cerium oxide powder was 4.0 parts by weight.
Urethane sheet B6: It was prepared using a urethane composition Bc in which the blending amount of the cerium oxide powder was 10.0 parts by weight.
Urethane sheet B7: It was prepared using a urethane composition Bd in which the blending amount of the cerium oxide powder was 15.0 parts by weight.

(Preparation of NBR sheet C1)
100.00 parts by weight of NBR (manufactured by Nippon Zeon Co., Ltd., trade name “Nippol 1031”), bis (2-ethylhexyl) phthalate (manufactured by Mitsubishi Chemical Corporation), 5.00 parts by weight, carbon black (manufactured by Tokai Carbon Co., Ltd., A rubber composition C was prepared by kneading 84.00 parts by weight of a trade name “ISAF”) and 0.40 part by weight of sulfur (made by Hosoi Chemical Co., Ltd., trade name “oil sulfur”) with a rubber kneader. .
Next, the obtained rubber composition C was press-molded in a mold to produce an NBR sheet C1 having a thickness of 2.0 mm. At this time, the molding conditions were a mold temperature of 150 ° C., a molding time of 15 minutes, and a press pressure of 2.94 N / mm ² .

(Preparation of NBR sheet C2)
An NBR sheet C2 having a thickness of 1.0 mm was produced in the same manner as the production of the NBR sheet C1, except that the cavity size of the mold was changed.

(Preparation of NBR sheet C3)
An NBR sheet C2 having a thickness of 3.0 mm was produced in the same manner as the production of the NBR sheet C1, except that the cavity size of the mold was changed.

(Preparation of NBR sheet C4)
100.00 parts by weight of NBR (manufactured by Nippon Zeon Co., Ltd., trade name “Nippol 1031”), bis (2-ethylhexyl) phthalate (manufactured by Mitsubishi Chemical Corporation), 5.00 parts by weight, carbon black (manufactured by Tokai Carbon Co., Ltd., 84.00 parts by weight of trade name “ISAF”), 7.0 parts by weight of cerium oxide powder (Cerico CH-BS302), and 0.40 part by weight of sulfur (trade name “Oil Sulphur” manufactured by Hosoi Chemical Co., Ltd.) The rubber composition Ca was prepared by kneading with a rubber kneader.
Next, the obtained rubber composition Ca was press-molded in a mold to produce an NBR sheet C4 having a thickness of 1.5 mm. At this time, the same molding conditions as those for the production of the NBR sheet C1 were adopted.

(Preparation of NBR sheet C5)
An NBR sheet C5 was produced in the same manner as the NBR sheet C4 except that the blending amount of the cerium oxide powder (CericoCH-BS302) was 4.0 parts by weight.

(Preparation of NBR sheet C6)
An NBR sheet C6 having a thickness of 1.6 mm was produced in the same manner as the production of the NBR sheet C1, except that the cavity size of the mold was changed.

(Preparation of NBR sheet C7)
An NBR sheet C7 having a thickness of 5.5 mm was produced in the same manner as the production of the NBR sheet C1, except that the cavity size of the mold was changed.

Examples 1-26 and Comparative Examples 1-8
While aligning the supporting member and various elastic members produced by the above-described method with each other so as to satisfy the protruding length L1 and the protruding length difference L3 shown in Tables 1 to 3, a double-sided tape having a width of 5 mm ( Nitto Denko Corporation, No. 500) was used for bonding. Thereafter, a plurality of bolt holes were formed, and a machine tool seal member having the shape shown in FIG. 1 was completed.
The following evaluation was performed about the sealing member for machine tools of Examples 1-26 and Comparative Examples 1-8.

[Evaluation]
(1) Evaluation of sliding resistance The sliding resistance of the sealing member for machine tools was evaluated using the testing machine shown in FIG. Evaluation was performed at room temperature. FIG. 5 is a cross-sectional view for explaining a method for evaluating the sliding resistance of the machine tool seal member produced in the examples and comparative examples.
As shown in FIG. 5, after fixing the machine tool seal member 10 to the side surface of the saddle 101, the saddle 101 is lowered toward the sliding bed 103, and the sliding contact side surface of the elastic member 12 contacts the sliding bed 103. Then, the saddle 101 (machine tool seal member 10) was further pushed into the sliding bed 103 side by 0.5 mm.
Next, in this state, the sliding bed 103 is moved in the direction of the arrow (the direction toward the left side in the figure) at a moving speed of 100 m / min, and the horizontal force acting on the saddle 101 at that time is measured with a spring alone. The sliding resistance of the machine tool seal member was evaluated based on the measured value at that time.
Here, “◎” indicates that the measured value of only the spring is less than 500 g, “◯” indicates that the measured value is 500 g or more and less than 1000 g, “Δ” indicates that the measured value is 1000 g or more and less than 1500 g, “×” indicates that the measured value is 1500 g or more and less than 2000 g. ".
Note that a coolant (Moleco's Neocool Bio-60E) was applied in advance to the surface of the sliding bed 103 (the surface on which the machine tool seal member 10 slides). The measurement results are shown in Tables 1-3.

(2) Evaluation of sealing performance The performance of the sealing member for machine tools was evaluated using the testing machine shown in FIG. The evaluation was performed at room temperature. FIG. 6 is a cross-sectional view for explaining a method of evaluating the performance of the sealing member for machine tools produced in Examples and Comparative Examples.
As shown in FIG. 6, after fixing two machine tool seal members 10 at the same height to the opposite sides of the saddle 111 in a direction in which the elastic members 12 face each other, the saddle 111 is attached to the sliding bed 113. The saddle 111 (machine tool seal member 10) was further pushed into the sliding bed 113 side from the point where the sliding contact side surface of the elastic member 12 contacted the sliding bed 113. At this time, 100 g of aluminum alloy (A2017) chips 114 are sealed in advance between the two machine tool seal members 10, and the surface of the sliding bed 113 (the machine tool seal member 10 is slid). The coolant (Molesco's Neocool Bio-60E) was previously applied to the moving surface.
Next, in this state, the sliding bed 113 is moved back and forth in the direction of the arrow (left and right in the figure) at a moving speed of 100 m / min and a sliding stroke (one way) of 1 m, so that the machine tool seal member is relatively moved. I drove for 3 km. Thereafter, the sealing performance of the sealing member for machine tools was evaluated based on the amount of chipping of the chip. The results are shown in Tables 1-3.
Here, the number of chips that leaked outside through the sealing member for machine tools was measured, and “◎” when there was no leaked chips, the number of chips was 1 or more and less than 6 The case was evaluated as “◯”, the case where the number of chips was 6 or more and less than 21 was evaluated as “Δ”, and the case where the number of chips was 21 or more was evaluated as “x”.

(3) Durability Evaluation In the same manner as the evaluation of the sealing property in (2) above, after the machine tool seal member traveled relatively 300 km, the state of the sliding contact side surface of the elastic member was observed. Based on the observation results, the durability of the sealing member for machine tools was evaluated. The results are shown in Tables 1-3.
Here, when no sliding contact mark is observed on the sliding contact side surface of the elastic member sliding with the sliding head 113, or a weak sliding contact mark is observed, “◎”, the reduction due to wear is 0.10 mm. The case where the amount of decrease due to wear was “Δ”, the case where the amount of decrease due to wear was 0.20 mm or more was evaluated as “X”.
Further, the sliding resistance of the machine tool seal member after the observation was evaluated in the same manner as in the above (1) Evaluation of sliding resistance. The results are shown in Tables 1-3.

  From the results shown in Tables 1 to 3, it is clear that the sealing member for machine tools according to the embodiment of the present invention is excellent in sealing performance.

DESCRIPTION OF SYMBOLS 1 Attachment part 2 Opponent member 10 Machine tool seal member 11 Support member 12 Elastic member 12A Sliding side surface 13 Adhesive layer L1 Projection length of elastic member L2 Thickness of elastic member

Claims (3)

A machine tool seal member comprising a plate-like support member and a plate-like elastic member fixed to the support member via an adhesive layer,
The elastic member has a thickness of 0.8 to 4.5 mm.
In sliding contact with the mating member on the side surface of the plate-like elastic member,
The side surface that is in sliding contact with the counterpart member protrudes from the support member,
The projecting length from the outer edge of the support member on the side surface in sliding contact with the counterpart member is 1.5 to 10 mm, and the projecting length of the surface on the side facing the support member is opposed to the support member. The difference between the protrusion length of the surface on the opposite side and the surface on the opposite side is 0.55 mm or less.   The sealing member for a machine tool according to claim 1, wherein the elastic member contains a low μ agent.   The sealing member for machine tools according to claim 1, wherein the elastic member is made of thermosetting polyurethane.