JP6672752B2 - Window structure and window unit - Google Patents

Description

  The present invention relates to a window structure and a window unit.

  When machining machine parts, machine tools such as a lathe, a drilling machine, a boring machine, a milling machine, a gear cutting machine, and a grinding machine are selectively used according to the machining. In recent years, there has been known a machining center capable of automatically performing machining by NC machining and automatically exchanging a tool and a workpiece (base material) (for example, see Patent Literature 1).

  The outside of the machining center described in Patent Document 1 is covered with an exterior (cover). As a result, a machining area where machining is performed and an operation area where an operator who operates the machining center can enter are partitioned, and safety for the operator is ensured. An openable door is provided on the exterior of the machining center. The opening / closing door is fitted with glass serving as a window through which the inside of the machining center can be viewed from the outside, that is, the machine area can be viewed from the operation area. As this glass, generally, a tempered glass having a thickness of 5 mm or more is generally used.

  However, flying objects that may occur during machining are scattered in the machining area of the machining center, and the flying objects may collide with the glass. In this case, depending on the degree of the collision, there is a problem that the glass is cracked and broken, or the glass is scratched and the internal visibility is reduced. Examples of the flying object include fragments generated when the processing tool is broken, fixing members (jigs) such as bolts for fixing the processing tool, and chips generated during processing.

JP 2012-203782 A

  An object of the present invention is to provide a flying object that can be generated during machining by a machine tool (for example, a fragment generated when a machining tool constituting the machine tool is broken, a fixing member such as a bolt (jig) for securing the machining tool, machining). It is an object of the present invention to provide a window structure and a window unit having excellent durability in the event of collision of chips generated at the time.

Such an object is achieved by the present invention described in the following (1) to ( 10 ).
(1) A window structure which is mounted on a machine tool and used to visually check the inside of the machine tool,
A glass plate composed of a glass material as a main material and having a thickness of 0.1 mm or more and 3 mm or less,
A plate-shaped resin plate that is arranged on the opposite side to the inside of the machine tool with respect to the glass plate, and is configured using a polycarbonate-based resin as a main material ,
An outer resin plate, which is arranged on the opposite side of the inside of the machine tool with respect to the resin plate and has a plate shape formed mainly of a polycarbonate-based resin,
An outer glass plate, which is arranged on the opposite side of the inside of the machine tool with respect to the outer resin plate and has a plate shape formed of a glass material as a main material ,
The glass plate and the resin plate are bonded via a first bonding layer,
The resin plate and the outer resin plate are bonded via a second bonding layer,
The outer resin plate and the outer glass plate are bonded via a third bonding layer ,
The glass plate and the outer glass plate, respectively, Ri ordinary glass der,
A structure for a window , wherein the thickness of the glass plate is the same as the thickness of the outer glass plate .

  (2) The window structure according to (1), wherein the haze of the window structure is 10% or less.

(3) The window structure according to (1) or (2), wherein the first adhesive layer has a tensile modulus of 5000 MPa or less.

(4) The window structure according to any one of (1) to (3), wherein the first adhesive layer has a tensile adhesive strength of 0.1 N / 25 mm or more and 200 N / 25 mm or less.

(5) The window structure according to any one of (1) to (4), wherein the thickness of the first adhesive layer is 0.01 mm or more and 3.0 mm or less.

(6) The window structure according to any one of (1) to (5), wherein the glass material of the glass plate includes at least soda lime glass.

  (7) The window structure according to any one of (1) to (6), wherein the thickness of the resin plate is 1 mm or more and 25 mm or less.

(8) The window structure according to any one of (1) to (7), wherein the polycarbonate-based resin of the resin plate is mainly a bisphenol-type polycarbonate resin.

( 9 ) The window structure according to any one of ( 1 ) to ( 8 ), wherein the outer glass plate has a surface opposite to the inside of the machine tool covered with a resin film.

( 10 ) The window structure according to any one of (1) to ( 9 ),
And a frame supporting the window structure,
A window unit, wherein the window structure and the frame are assembled.

  Advantageous Effects of Invention According to the present invention, flying objects that can be generated during machining by a machine tool (for example, debris generated when a machining tool constituting the machine tool is broken, fixing members such as bolts (jigs) for fixing the machining tool, machining) Thus, a window structure and a window unit having excellent durability in the event of collision of chips generated at the time of collision can be obtained.

FIG. 1 is a perspective view showing an example of a machine tool equipped with a window unit (first embodiment) of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. FIG. 3 is a vertical longitudinal sectional view showing a second embodiment of the window unit of the present invention. FIG. 4 is a vertical longitudinal sectional view showing a third embodiment of the window unit of the present invention.

  Hereinafter, a window structure and a window unit of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

<First embodiment>
FIG. 1 is a perspective view showing an example of a machine tool equipped with a window unit (first embodiment) of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. In the following description, the upper side in FIGS. 1 and 2 (the same applies to FIGS. 3 and 4) is referred to as “upper” or “upper”, and the lower side in FIGS. 1 and 2 is referred to as “lower” or “lower”. In FIG. 2 (the same applies to FIGS. 3 and 4), the right side is referred to as “inside”, and the left side is referred to as “outside”. In FIG. 2 (the same applies to FIGS. 3 and 4), the thickness direction of the window unit is illustrated with emphasis.

  The machine tool shown in FIG. 1 is a machining center 10 capable of automatically performing machining by NC machining, and automatically exchanging a tool and a (base material) according to the machining. The machining center 10 includes a machining tool 101 that actually performs machining on a machining target, an exterior 102 that covers the entire machining tool 101, and an operation panel 103 that operates and controls the operation of the machining tool 101. Have.

  As shown in FIG. 2, in the present embodiment, an end mill that performs cutting is exemplified as the processing tool 101. The processing tool 101, which is an end mill, has a plurality of inserts 104 at its tip. And, by relatively rotating the processing tool 101 and the cylindrical body 20 as a processing target, the cylindrical body 20 can be cut. The number of revolutions is, for example, preferably 8000 rpm or more and 12000 rpm or less, and more preferably 9000 rpm or more and 11000 rpm or less.

  In addition, since the machining center 10 is used, as the machining tool 101, in addition to a tool having a function of cutting, for example, a tool having a function of a lathe, a drilling machine, a boring machine, a milling machine, a gear cutting machine, and a grinding machine may also be used. Have.

  The exterior 102 is made of a metal plate, and is fixed to a frame (not shown) constituting a skeleton of the machining center 10 via, for example, a bolt. Thereby, it is possible to reliably partition the machining area S1 where the machining is performed by the machining tool 101 and the operation area S2 where the operator who operates the machining center 10 can enter. Therefore, safety for the operator can be ensured.

  The operation panel 103 includes a control unit 105 in which programs for performing various types of machining are stored in advance, and a liquid crystal panel 106 and operation buttons 107 for performing operations such as calling the programs.

  By the way, as shown in FIG. 2, during cutting, the processing tool 101 is broken by the life of the tool 101, for example, due to metal fatigue, the chip 101 ′ which has been broken (deleted), and the cylindrical body 20 generated during the processing. Of the liquid 30 such as lubricating oil or a cooling liquid for cooling (coolant liquid) for smooth processing, and the like as droplets or mist (oil mist) as the flying object 40 There is a possibility that the particles fly (fly) in the processing area S1. In this case, the flying object 40 collides with the exterior 102 from the inside depending on the degree of the scattering, and further scattering is surely prevented. This prevents the flying object 40 from scattering and entering the operation area S2. Therefore, the operator is prevented from being injured or soiled by the flying object 40. The flying object 40 may include a broken piece of the insert 104 in addition to the fragment 101 ′, the chip 201, and the liquid 30.

  As shown in FIG. 2, the machining center 10 is mounted on an exterior 102 and has a window unit (machine tool window) 1 that forms a part of the exterior 102 in the mounted state. The window unit 1 (window structure 2) visually recognizes the inside of the machining center 10, that is, the processing area S1, and also incorporates light from, for example, a fluorescent lamp in the operation area S2 into the processing area S1 and visually recognizes it. It is used to improve the performance. As described above, the window unit 1 has a function as a viewing window and a function as a lighting window.

  The window unit 1 includes a window structure 2 that is a laminate, and a frame (window frame) 4 that supports the window structure 2.

  The window structure 2 includes a glass plate 3, a first adhesive layer (adhesive layer) 5a, a first resin plate (resin plate) 6a, a second adhesive layer (outer adhesive layer) 5b, Two resin plates (outer resin plates) 6b and a resin film 7 are stacked in this order from inside to outside.

The glass plate 3 has a plate shape, and the thickness t ₃ is 0.1 mm or more and 3 mm or less, preferably 0.1 mm or more and 2 mm or less, more preferably 0.1 mm or more and 1.5 mm or less. It is the following ordinary glass (float glass). When the thickness t ₃ is less than the lower limit, when the flying object 40 collides with the glass plate 3, even if the impact is relatively small (for example, in the case of the chip 201), the glass plate 3 is damaged or broken ( Damage). Also, when the thickness t ₃ exceeds the upper limit, when a large projectile 40 (e.g. debris 101 'and insert 104) hits the glass plate 3, cracks increases due to it, the influence on the visibility Exert.

  The glass plate 3 is mainly composed of a glass material containing at least soda lime glass. Such a glass material is excellent in oil resistance and scratch resistance as compared with polycarbonate. During the operation of the machining center 10, the liquid 30 adheres to the inner surface of the glass plate 3, and fragments 101 ′ and chips 201 collide. By arranging the glass plate 3 so as to face the processing region S1, it is possible to prevent the liquid 30 from adhering to the first resin plate 6a and prevent the fragments 101 'and the chips 201 from colliding. Thereby, breakage, deterioration and deterioration of the first resin plate 6a can be suitably prevented or suppressed.

  The content of the glass material in the glass plate 3 is not particularly limited, but is preferably 85% by mass or more, and more preferably 95% by mass or more. By setting the glass content within the above range, the glass plate 3 can exhibit extremely excellent oil resistance and scratch resistance while maintaining sufficient transparency.

  In addition, the glass plate 3 may include various additives such as an ultraviolet absorber and a coloring agent plasticizer, if necessary.

  The glass constituting such a glass plate 3 is ordinary glass as described above. That is, as the glass plate 3, a normal glass plate that has not been subjected to a strengthening treatment such as air cooling and chemical strengthening (strengthening by ion exchange) is preferably used. The surface hardness of the ordinary glass sheet is lower than that of the tempered glass sheet subjected to the tempering treatment. Therefore, by using a normal glass plate as the glass plate 3, even if a flying object 40 having a relatively large mass such as a shard 101 ′ collides with the inner surface of the glass plate 3 (the surface on the processing area S <b> 1 side), 3 can bend toward the first resin plate 6a, and this impact is absorbed by the first resin plate 6a and the first adhesive layer 5a.

  A transparent first resin plate 6a is disposed outside the glass plate 3, that is, on the side opposite to the inside of the machining center 10, and a transparent second resin plate 6a is provided outside the first resin plate 6a. Resin plate 6b is disposed. In addition, “transparent” includes colorless and transparent, and the machining center 10 is preferably colorless and transparent.

The first resin sheet 6a is a plate-like, the thickness _{t 6a,} depending on the size of the thickness _{t 3,} for example, 1 mm or more, preferably at 25mm or less, 3 mm or more, 20 mm or less Is more preferable.

The second resin plate 6b, a plate-like shape, the thickness _{t 6b,} depending on the size of the thickness _{t 3} and thickness _{t 6a,} for example, 1 mm or more, preferably at 25mm or less, More preferably, it is 3 mm or more and 20 mm or less.

  Then, the first resin plate 6a and the second resin plate 6b having such a thickness are combined, so that the strength of the entire window structure 2 can be sufficiently secured. Here, “ensure sufficient strength of the entire window structure 2” means that even if the fragment 101 ′ collides with the window structure 2 at, for example, 2000 J, the fragment 101 ′ is not affected by the window structure 2. 2 to the extent that it can be reliably prevented from breaking through.

  Each of the first resin plate 6a and the second resin plate 6b is made mainly of a polycarbonate resin. Thereby, each resin plate is excellent in transparency and also excellent in impact resistance against the debris 101 ′ and the like.

  The polycarbonate resin is not particularly limited. For example, an aromatic polycarbonate resin in which bisphenol and phosgene or diphenyl carbonate are carbonate-bonded can be used. This aromatic polycarbonate resin is generally synthesized by interfacial polycondensation, transesterification, or the like.

  Examples of the bisphenol include bisphenol A and bisphenol (modified bisphenol) represented by the formula (1).

（式中、Ｘは、炭素数１〜１８のアルキル基、芳香族基、および環状脂肪族基から選ばれるものであり、Ｒａ、Ｒｂは、炭素数１〜１２のアルキル基であり、ｍ、ｎはそれぞれ０〜４である。）

(Wherein, X is selected from an alkyl group having 1 to 18 carbon atoms, an aromatic group, and a cycloaliphatic group; Ra and Rb are alkyl groups having 1 to 12 carbon atoms; n is each 0 to 4.)

  As the bisphenol represented by the formula (1), specifically, for example, 4,4 ′-(pentane-2,2-diyl) diphenol, 4,4 ′-(pentane-3,3-diyl) diphenol, 4,4 ′-(butane-2,2-diyl) diphenol, 1,1 ′-(cyclohexanediyl) diphenol, 2-cyclohexyl-1,4-bis (4-hydroxyphenyl) benzene, 2,3- Biscyclohexyl-1,4-bis (4-hydroxyphenyl) benzene, 1,1′-bis (4-hydroxy-3-methylphenyl) cyclohexane, 2,2′-bis (4-hydroxy-3-methylphenyl) And propane.

  And among the polycarbonate resins, a bisphenol-type polycarbonate resin having a bisphenol skeleton is preferable. Thereby, the first resin plate 6a and the second resin plate 6b are further excellent in transparency and further excellent in impact resistance against the debris 101 'and the like.

  The constituent materials of the first resin plate 6a and the second resin plate 6b may include, for example, a plasticizer, an antioxidant, a filler, and the like, as necessary.

  The glass plate 3 and the first resin plate 6a are bonded via a first bonding layer 5a, and the first resin plate 6a and the second resin plate 6b are bonded to each other by a second bonding layer 5b. Is glued through.

  The tensile modulus of the first adhesive layer 5a is not particularly limited and is 5,000 MPa or less, preferably 4500 MPa or less, and more preferably 4000 MPa or less. The impact that the glass plate 3 receives from the flying object 40, particularly the debris 101 'considered to be the heaviest, is transmitted to the first resin plate 6a via the first adhesive layer 5a. In the adhesive layer 5a, the impact is reduced because the tensile modulus is in the above numerical range. Then, in combination with the fact that the glass plate 3 is made of ordinary glass, it is possible to more reliably prevent the entire surface of the glass plate 3 from being whitened due to a crack due to an impact.

  Further, the tensile modulus of the second adhesive layer 5b can be the same as the tensile modulus of the first adhesive layer 5a. This contributes to securing the strength of the entire window structure 2. Although it depends on the constituent materials of the first adhesive layer 5a and the second adhesive layer 5b, for example, in the process of manufacturing the window structure 2, the first adhesive layer 5a and the second adhesive layer 5b Can be laminated or cured under the same conditions. Note that the tensile modulus of the second adhesive layer 5b may be different from the tensile modulus of the first adhesive layer 5a. In addition, the second adhesive layer 5b is not particularly limited as long as it can bond polycarbonate to each other.

  The tensile adhesive strength of the first adhesive layer 5a and the second adhesive layer 5b is preferably 0.1 N / 25 mm or more and 200 N / 25 mm or less, respectively, and more preferably 1 N / 25 mm or more and 180 N / 25 mm or less. Is more preferred. Accordingly, it is possible to prevent the adhesive layer from being deteriorated with time irrespective of the magnitude of the impact while preventing the adhesive layer from being deformed with time.

The thickness _{t 5a} of the first adhesive layer 5a and the thickness _{t 5b} of the second adhesive layer 5b, for example, 0.01 mm or more, preferably at 3.0mm or less, 0.05 mm or more, 1. More preferably, it is 5 mm or less. This suppresses the total thickness (total thickness) of the window structure 2 while sufficiently securing the adhesive force (adhesion) of each adhesive layer, that is, contributes to reducing the thickness of the window structure 2. Note that the thickness t _5a and the thickness t _5b may be the same or different.

  Each of the first adhesive layer 5a and the second adhesive layer 5b may be made of any adhesive as long as it can exhibit a sufficient adhesive strength, but an adhesive having excellent oil resistance is used. preferable. By forming the first adhesive layer 5a and the second adhesive layer 5b with such an adhesive, it is possible to prevent the liquid 30 from penetrating into the operation area S2.

  The oil resistance of the first adhesive layer 5a and the second adhesive layer 5b (hereinafter, “first adhesive layer 5a”) is, for example, the mass when the first adhesive layer 5a is immersed in a predetermined chemical solution. The rate of increase can be used as an index. Specifically, when the first adhesive layer 5a is immersed in an alkaline solution having a pH of 8 to 10.5 at 40 ° C. for 14 days, the mass increase rate of the first adhesive layer 5a is 30% or less. Is preferably 20% or less, more preferably 15% or less. It can be determined that the first adhesive layer 5a has excellent oil resistance.

  The adhesive preferably contains at least one of a curable adhesive and a hot-melt adhesive. The first adhesive layer 5a formed using these adhesives has a high resin cross-linking density therein and exhibits extremely high oil resistance. Examples of the curable adhesive include a photocurable adhesive, a thermosetting adhesive, a two-component reactive adhesive, and the like. On the other hand, examples of the hot melt type adhesive include an adhesive containing at least one of urethane resin, butyral resin and ethylene-vinyl acetate copolymer, and an adhesive containing a urethane resin is particularly preferable. . An adhesive containing a urethane resin has high resistance to a coolant liquid, and facilitates bonding by thermocompression bonding as described later. In addition, specific examples of the photocurable adhesive include an adhesive containing a (meth) acrylate monomer and / or a (meth) acrylate oligomer and a polymerization initiator.

  The glass plate 3 and the first resin plate 6a are laminated via the first adhesive layer 5a made of these adhesives, and these are thermocompressed to form the glass plate 3 and the first resin plate. 6a can be reliably performed. In the case where a photo-curable adhesive is used, after applying or thermocompression bonding between the glass plate 3 and the first resin plate 6a, the photo-curable adhesive may be cured by irradiating the photo-curable adhesive with light such as ultraviolet rays. Good.

  In addition, as a constituent material of the first adhesive layer 5a and the second adhesive layer 5b, an acrylic resin can be used as a main material.

  The outer surface 61 of the second resin plate 6b is covered with the resin film 7. Thus, the outermost second resin plate 6b can be protected. As a result, it is possible to prevent deterioration due to the coolant liquid in the form of a mist, and to prevent damage due to touch of an operator's hand.

The thickness _{t 7} of the resin film 7, for example, 10 [mu] m or more, preferably at 200μm or less, 20 [mu] m or more, more preferably 150μm or less.

  The constituent material of the resin film 7 is not particularly limited. For example, polyethylene terephthalate (PET) is preferable, and other materials having a coolant resistance such as an acrylic film / a transparent vinyl chloride film can be used. The window structure 2 configured as described above has excellent durability when the flying object 40 collides as described above.

  Further, the haze of the window structure 2 is, for example, preferably 10% or less, more preferably 5% or less. Thus, the window structure 2 has good transparency for visually recognizing the processing region S1. In addition, when the haze of the window structure 2 exceeds 10%, the window structure 2 becomes cloudy and visibility becomes poor. “Haze” is an index related to transparency, and is a value representing turbidity (cloudiness).

  The frame 4 is a member that supports the window structure 2. As a result, the window unit 1 is in an assembled state shown in FIG. 2 in which the window structure 2 and the frame body 4 have been assembled in advance, and thus can be easily attached to the exterior 102 in this assembled state.

  The constituent material of the frame 4 is not particularly limited. For example, various metal materials such as aluminum and aluminum alloy, and various resin materials can be used.

  The frame 4 has a rectangular frame shape along the edge of the window structure 2, that is, a rectangular frame shape in a plan view, and through holes 41 are formed at four corners thereof. In the machining center 10, the portion of the exterior 102 where the window unit 1 is installed is open, and four stud bolts 102a are supported and fixed around the opening. Then, the stud bolt 102a is inserted into each through hole 41 of the frame body 4, and the nut 102b can be screwed to the stud bolt 102a. As a result, the window unit 1 is mounted on the exterior 102.

<Second embodiment>
FIG. 3 is a vertical longitudinal sectional view showing a second embodiment of the window unit of the present invention.

Hereinafter, a second embodiment of the window structure and the window unit of the present invention will be described with reference to this drawing, but the description will focus on the differences from the above-described embodiment, and the same items will not be described. Omitted.
This embodiment is the same as the first embodiment except that the configuration of the window structure is different.

  As shown in FIG. 3, in the present embodiment, the window structure 2 includes a glass plate (outside) serving as a second glass plate disposed between the first resin plate 6a and the second resin plate 6b. A glass plate 3b and an air space 8 are further provided.

The glass plate 3b is bonded to the first resin plate 6a via the second adhesive layer 5b. Similarly to the glass plate 3, the glass plate 3b is plate-shaped and is ordinary glass composed mainly of the above-described glass material. The thickness t _3b of the glass plate 3b may be different from the thickness t ₃ of the glass plate 3, but may also be the same. If the thickness t _3b and the thickness t ₃ are the same, as a glass plate 3b, may be the same as that of the glass plate 3. In addition, for example, when the glass plate 3, the first adhesive layer 5a, the first resin plate 6a, the second adhesive layer 5b, and the glass plate 3b are formed as one laminated plate 11, the laminated plate 11 is framed. When attached to the body 4, it can be attached regardless of its front and back.

The air layer 8 is a gap formed between the glass plate 3b and the second resin plate 6b. The thickness _{t 8} of the air layer 8, namely, gap length, 1 mm or more, is preferably less than 3mm, 1.5 mm or more, more preferably 2.5mm or less. Thereby, when the fragments 101 'collide with the laminated plate 11, the laminated plate 11 can bend toward the air layer 8, that is, in the direction of collision, and the impact is absorbed. Thus, the air layer 8 functions as a shock absorbing layer.

<Third embodiment>
FIG. 4 is a vertical longitudinal sectional view showing a third embodiment of the window unit of the present invention.

Hereinafter, a third embodiment of the window structure and the window unit of the present invention will be described with reference to this drawing, but the description will be focused on the differences from the above-described embodiment, and the same items will not be described. Omitted.
This embodiment is the same as the first embodiment except that the configuration of the window structure is different.

  As shown in FIG. 4, in this embodiment, the window structure 2 includes a glass plate 3c bonded to a second resin plate 6b via a third adhesive layer 5c instead of the resin film 7. It has become.

Similarly to the glass plate 3, the glass plate 3c is plate-shaped and is ordinary glass composed mainly of the above-described glass material. The thickness t _3c of the glass plate 3c may be different from the thickness t ₃ of the glass plate 3, but may also be the same. If the thickness t _3c and the thickness t ₃ are the same, as a glass plate 3c, can be the same as that of the glass plate 3.

The third adhesive layer 5c may have the same tensile modulus as the first adhesive layer 5a, but may have a different tensile modulus. Note that the tensile adhesive strength of the third adhesive layer 5c, the thickness t _5c of the third adhesive layer 5c, and the constituent material of the third adhesive layer 5c may be the same as those of the first adhesive layer 5a. , May be different and is not particularly limited. For example, when the third adhesive layer 5c is the same as the first adhesive layer 5a, the third adhesive layer 5c can be cured under the same conditions as the first adhesive layer 5a. Batch joining can be performed, and the manufacturing process of the window structure 2 can be simplified. Further, the arrangement of the “glass plate”, “adhesive layer”, and “resin plate” is symmetrical between the processing region S1 side and the operation region S2 side via the second adhesive layer 5b, and the window structure 2 Can be expected to suppress warpage.

  Further, the window structure 2 of the present embodiment differs from the window structure 2 of the second embodiment in that the air layer 8 is omitted, so that the thickness can be reduced.

  Further, the resin film 7 described in the first embodiment may be attached to the glass plate 3c.

  As described above, the window structure and the window unit of the present invention have been described with reference to the illustrated embodiments, but the present invention is not limited to this, and each part constituting the window structure and the window unit is: It can be replaced with any configuration that can exhibit the same function. Further, an arbitrary component may be added.

Further, the window structure and the window unit of the present invention may be a combination of any two or more configurations (features) of the above embodiments.
The method for manufacturing the window structure is not particularly limited.

  Hereinafter, specific examples of the present invention will be described. Note that the present invention is not limited to this.

(Example 1)
1. Preparation of Window Structure The glass plate 3, the first resin plate 6a, the second resin plate 6b, the first adhesive layer 5a, the second adhesive layer 5b, and the adhesive layer And a resin film 7 having the same.

・ Glass plate 3
Material: ordinary glass thickness _t 3: 1.1mm

・ First resin plate 6a
Material: polycarbonate Thickness _t6a : 12 mm

.Second resin plate 6b
Material: polycarbonate Thickness t _6b : 8 mm

-First adhesive layer 5a, second adhesive layer 5b
Material: Urethane hot melt adhesive Thickness _t5a , thickness _t5b : 0.3 mm

・ Resin film 7
Material: polyethylene terephthalate Thickness: 50 μm

  Then, the glass plate 3, the first resin plate 6a, the second resin plate 6b, the first adhesive layer 5a, the second adhesive layer 5b, and the resin film 7 are combined with the window structure of the first embodiment (FIG. 2). ), And these are adhered at 100 ° C. under a vacuum condition, and then fully adhered at 100 ° C. and 0.9 MPa for 10 minutes using an autoclave, thereby obtaining the window structure of Example 1. I got

  The thickness, tensile modulus, and tensile adhesive strength of the first adhesive layer 5a and the second adhesive layer 5b were as shown in Table 1, respectively.

(Examples 2 to 15, Comparative Examples 1 to 4)
A window structure was obtained in the same manner as in Example 1 except that the conditions were changed as shown in Table 1.

2. Evaluation In performing the following evaluations, the following evaluations were performed using samples cut out from the window structure obtained in each example and each comparative example into a size of 100 mm in length × 100 mm in width.

2-1 Flaw acceleration test (impact test assuming chip 201)
The scratch acceleration test was performed as follows. First, the cut sample was fixed to a sample holder so that the chip / lubricating oil mixture would collide against a surface that would face the inside of the machine tool. Next, chips of iron: S45C (weight: 1.0 g / piece) were prepared as chips. “Castrol Hysol MB-50” manufactured by BP Japan was prepared as a coolant liquid. Iron: S45C chips (210.0 parts by mass) and Castrol Hysol MB-50 (500.0 parts by mass) were weighed and mixed to obtain a mixture. Next, the chip / lubricating oil mixture was made to collide with the cut sample fixed to the sample holder using compressed air. The conditions for causing the chip / lubricating oil mixture to collide were: the collision speed was 5 m / sec, the distance was 10 cm with respect to the center of the surface of the glass plate 3, and the number of repetitions was 100.
Then, the impact property assuming the chip 201 was evaluated based on the following criteria.

：: good without cracks and cracks in glass (sample) ×: part or all of glass (sample) was crushed

2-2 Horizontal steel ball impact test (impact test assuming fragment 101 'and insert 104)
In the horizontal steel ball impact test, the measurement was performed using a horizontal steel ball impact tester that injects a steel ball toward a sample using nitrogen gas introduced into a high-pressure chamber. This steel ball is similar to a fragment 101 '. Then, the sample was set so as to be perpendicular to the floor surface. Next, a steel ball having a diameter of 5 mmφ and a weight of 0.5 gf is fired at a collision speed of 125 m / sec toward a surface which will face the inside of the machine tool with respect to the sample. Was visually checked. The distance between the chamber to be fired and the sample was 2 m.

：: Cracks and / or dents occurred in part of the sample, but there was no problem in visibility through the sample. X: Cracks and / or dents occurred in part of the sample, and visibility through the sample was significantly reduced. (There is a problem in actual use)

2-3 Haze measurement For each sample, the diffuse transmittance Td and the total light transmittance Tt were determined using a haze meter (“NDH2000” manufactured by Nippon Denshoku Industries Co., Ltd.), and “T [%] = Td / Tt × By substituting 100, haze T [%] was calculated. In addition, haze is an index regarding transparency, and represents turbidity (cloudiness).

：: 10% or less ×: 10% or more

  In each of the examples, “○” was obtained, but in each of the comparative examples, “×” was obtained. In addition, window structures having the configurations shown in FIGS. 3 and 4 were produced, and the same evaluation was performed on these structures. As a result, the same evaluation results as those of the examples were obtained.

1 Window unit (window for machine tool)
11 laminated plate 2 window structure 3, 3b, 3c glass plate 4 frame (window frame)
41 through hole 5a first adhesive layer (adhesive layer)
5b Second adhesive layer (outer adhesive layer)
5c Third adhesive layer 6a First resin plate (resin plate)
6b Second resin plate (outer resin plate)
61 Outer surface 7 Resin film 8 Air layer 10 Machining center 101 Processing tool 101 'Fragment 102 Exterior 102a Stud bolt 102b Nut 103 Operation panel 104 Insert 105 Control unit 106 Liquid crystal panel 107 Operation buttons 20 Cylindrical body 201 Chips 30 Liquid 40 Flying things S1 machining region S2 operation area _{t 3, t 3b, t 3c} , t 5a, t 5b, t 5c, t 6a, t 6b, t 7, t 8 thickness

Claims (10)

A window structure that is mounted on a machine tool and used to view the inside of the machine tool,
A glass plate composed of a glass material as a main material and having a thickness of 0.1 mm or more and 3 mm or less,
A plate-shaped resin plate that is arranged on the opposite side to the inside of the machine tool with respect to the glass plate, and is configured using a polycarbonate-based resin as a main material ,
An outer resin plate, which is arranged on the opposite side of the inside of the machine tool with respect to the resin plate and has a plate shape formed mainly of a polycarbonate-based resin,
An outer glass plate, which is arranged on the opposite side of the inside of the machine tool with respect to the outer resin plate and has a plate shape formed of a glass material as a main material ,
The glass plate and the resin plate are bonded via a first bonding layer,
The resin plate and the outer resin plate are bonded via a second bonding layer,
The outer resin plate and the outer glass plate are bonded via a third bonding layer ,
The glass plate and the outer glass plate, respectively, Ri ordinary glass der,
A structure for a window , wherein the thickness of the glass plate is the same as the thickness of the outer glass plate .   The window structure according to claim 1, wherein the haze of the window structure is 10% or less. 3. The window structure according to claim 1, wherein the first adhesive layer has a tensile modulus of 5000 MPa or less. 4. The window structure according to any one of claims 1 to 3, wherein the first adhesive layer has a tensile adhesive strength of 0.1 N / 25 mm or more and 200 N / 25 mm or less. The window structure according to any one of claims 1 to 4, wherein a thickness of the first adhesive layer is 0.01 mm or more and 3.0 mm or less. The window structure according to any one of claims 1 to 5 , wherein the glass material of the glass plate includes at least soda lime glass.   The window structure according to any one of claims 1 to 6, wherein a thickness of the resin plate is 1 mm or more and 25 mm or less. The window structure according to any one of claims 1 to 7 , wherein the polycarbonate-based resin of the resin plate is mainly a bisphenol-type polycarbonate resin. The window structure according to any one of claims 1 to 8 , wherein the outer glass plate has a surface opposite to the inside of the machine tool covered with a resin film. A window structure according to any one of claims 1 to 9 ,
And a frame supporting the window structure,
A window unit, wherein the window structure and the frame are assembled.

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