WO2007018074A1 - Resinoid grinding wheel - Google Patents

Abstract

Disclosed is a resinoid grinding wheel comprising an epoxy resin as an binder, which is free from the occurrence of chipping or microcracking particularly in the grinding of a hard and brittle material. Also disclosed is a method for production of the resinoid grinding wheel. A resinoid grinding wheel comprising an epoxy resin and an abrasive grain fixed with the epoxy resin, wherein the epoxy resin is a plastic epoxy resin, preferably an epoxy resin modified with dimer acid. The resinoid grinding wheel has a compressive strength of 5 to 20 MPa (as measured in accordance with JIS R1608) and an elastic modulus of 30 to 40 MPa (as measured in accordance with JIS R1602).

Description

 Specification

 Resinoid grinding wheel

 Technical field

 [0001] The present invention relates to a resinoid mortar and a method for producing the same. More specifically, the present invention is particularly suitable for polishing a hard and brittle material, without causing chipping or microcracking, and deburring a pressed metal part, and a thin plate-like work with unevenness. The present invention relates to a resinoid grindstone using an epoxy resin as a binder, and a method for producing the same, which ensures a good polished surface quality in the polishing of objects.

 Background art

 [0002] Resinoid mortar is a grinding wheel that is widely used because of its high-efficiency grinding. Generally, phenolic resin, epoxy resin, PVA are used as organic binders for resinoid grinding wheels, and urethane resin, melamine resin, etc. are used as other organic resins. Among these organic binders, resin grindstones using epoxy resin are suitably used for high-efficiency grinding such as deep cutting due to good wettability between the abrasive grains and the binder. In addition, epoxy resin can be easily cast-molded, and a resinoid grindstone using this can be easily manufactured.

 [0003] As types of epoxy resins used for resinoid grinding wheels, bisphenol A type epoxy resins or bisphenol F type epoxy resins are generally used. This is because, for example, these epoxy resins can be easily obtained, the hardness and heat resistance of the grindstone itself can be improved by using these epoxy resins as a binder, The ability to maintain a certain amount of power. Resinoid grinding wheels using epoxy resin are disclosed in Patent Documents 1 and 2, for example.

[0004] On the other hand, in order to obtain a resinoid stone that can achieve a good finished surface roughness with low grinding resistance, there has been an attempt to make a resinoid wheel that uses epoxy resin as a binder porous. Has been made. For example, in Patent Document 3, a resinoid mortar using liquid epoxy resin as an organic binder is used! More than 40% by volume due to the action of the liquid foaming agent, and if necessary, 60-80% by volume. The porosity is obtained. The resulting gun When using stone, low grinding resistance and good finished surface roughness are achieved. This is thought to be due to the contribution of a reduction in the elastic modulus of the turret in addition to the porosity. Patent Document 1: Japanese Patent Laid-Open No. 48-77489

 Patent Document 2: Japanese Patent Laid-Open No. 10-202536

 Patent Document 3: Japanese Unexamined Patent Application Publication No. 2004-160646

 Disclosure of the invention

 Problems to be solved by the invention

 [0005] In recent years, the demand for grinding and polishing IT-related parts such as silicon wafers and glass processing has increased, and the requirements for the processing characteristics have become severe.

 [0006] Workpieces in this field are glass and ceramic materials that are different from conventional iron-based materials that are the main objects of grinding and polishing, and these materials can be processed compared to iron-based materials. It is a difficult so-called hard and brittle material. In the processing of hard and brittle materials with fixed abrasive tools, there is a problem that chipping and microcracks are likely to occur.

 [0007] As an example of processing of a hard and brittle material, the TFT liquid crystal glass material has an edge force applied by a diamond wheel of a metal bond binder. , Easy to induce subsequent dusting. Dust generation leads to panel failure due to contamination and scratches in the subsequent process. Therefore, the edge polishing has a finishing polishing process that smoothes the streaks and removes or reduces microcracks. Often added,

 [0008] When a mortar using epoxy resin as a binder described in Patent Documents 1 and 2 described above is used for finish polishing of glass, due to good adhesion between the binder and abrasive grains. Although the sharpness to remove the streak of the previous caloe and the durability of the turret can be secured, it is easy to generate further chipping and microcracks due to the impact on the work, which is poor in the resilience of the turret. For this reason, in order to prevent this and ensure a fine surface roughness, the abrasive grains used in the turret are made finer, the grinding wheel is made more porous, and the depth of cut and the pressure applied to the work material are reduced. It is necessary to set and control machining conditions such as small and strict control.

[0009] Further, when the porous grindstone disclosed in Patent Document 3 described above is used for polishing hard brittle materials, a certain degree of improvement effect was observed, but this is not always sufficient. [0010] Further, in the deburring process of press-punched metal parts and the polishing of uneven thin plate-like workpieces, the quality of the polished surface is ensured and the mortar is the same as the polishing of the hard brittle material. Durability is required.

 [0011] Examples of binder resins mainly used in resinoid mortars other than epoxy resins include phenol resin, polyimide resin, polyurethane resin, PVA resin, rubber-based resin, and the like. However, phenol resin and polyimide resin are hard resins and excellent in mechanical strength, and there is no problem in terms of durability of the mortar, but grinding of hard and brittle materials that do not have flexibility in the resin itself. Suitable for polishing! ! Cunning.

 [0012] Polyurethane resin, PVA resin, and rubber-based resin are flexible, and are capable of grinding and polishing hard and brittle materials. Since the durability of the turret is low, the turret replacement frequency is shortened and the production efficiency is poor.

 [0013] Therefore, in view of the above-mentioned problems, the present invention has obtained a good sharpness and durability without generating V, chipping or microcracks, especially in a grinding and polishing case of a hard and brittle material. It is an object of the present invention to provide a resinoid grindstone using an epoxy resin as a binder and a method for producing the same.

 Means for solving the problem

 [0014] In order to solve the above-mentioned problems, the present inventors have conducted intensive research, and as a result, by imparting specific softness characteristics to a grindstone using an epoxy resin as a binder, it is possible to polish hard brittle materials. It was discovered that it was possible to ensure polishing power and good durability that could remove streaks on the pre-processed surface while preventing the occurrence of chipping and microcracks with low impact force on the work material. Completed the invention.

 [0015] The resinoid grindstone of the present invention is characterized in that the abrasive grains are fixed with an epoxy resin and the epoxy resin is a flexible epoxy resin. The resinoid grindstone preferably has a compressive strength value of CFI S R1608 (measured according to CFI S R1608) force and 20 MPa and an elastic modulus (measured according to JIS R1602) of 30 to 40 MPa. The flexible epoxy resin is preferably a dimer acid-modified epoxy resin.

[0016] In the resinoid grindstone of the present invention, the epoxy resin preferably contains an aromatic glycidyl ether type epoxy resin up to 40% by weight based on the total weight of the epoxy resin. Yes. Further, the aromatic glycidyl ether type epoxy resin is preferably bisphenol A type epoxy resin or bisphenol F type epoxy resin.

[0017] Further, it is preferable that the resinoid grindstone of the present invention has a large pore by using a powder or liquid foaming agent, an inorganic or organic pore forming agent, or a surfactant.

 [0018] Further, in the resinoid grindstone of the present invention, the rubber hardness of the resinoid grindstone is rubber hardness.

It is preferably 50 to 90 as measured by A scale.

[0019] The resinoid grinding wheel preferably has a 25% compression hardness (JIS K6767) of 1.0 to 35. OMPa.

 [0020] Furthermore, the resilience modulus of the resinoid mortar is preferably 5 to 20%.

 The invention's effect

 [0021] According to the present invention, there is provided a resinoid grindstone using an epoxy resin as a binder, and a method for producing the same, without generating any chipping particularly when grinding hard and brittle materials. The resinoid grindstone of the present invention uses an epoxy resin, so the adhesion between the binder and the abrasive grains is secured, so there is no problem in terms of durability, and the epoxy resin is used. In particular, when polishing hard and brittle materials, chipping with low grinding resistance does not occur, in other words, good finished surface roughness can be imparted.

 Brief Description of Drawings

FIG. 1 is a conceptual diagram showing a method for measuring the rebound resilience of a grindstone.

 FIG. 2 is a conceptual diagram showing a method for measuring a 25% compression hardness value of a turret.

 Explanation of symbols

[0023] 1 Load measurement Pressure head

 2 Test wheel

 3 Lower platform

 4 Pressurization direction (vertical direction from top to bottom)

 5 Steel balls

BEST MODE FOR CARRYING OUT THE INVENTION [0024] Hereinafter, preferred embodiments of the resinoid mortar of the present invention and the method for producing the same will be described.

 First, a preferred embodiment of the resinoid grindstone of the present invention will be described.

 [0026] In order to solve the problems of the present invention, focusing on the physical properties of the grindstone, a flexible characteristic is required to reduce the impact in the polishing process of the hard and brittle material. Since the grindstone has such characteristics, it is possible to prevent the occurrence of chipping and microcracks.

 [0027] Further, in addition to the good adhesion between the binder and the abrasive grains, the grindstone further imparted with flexibility can be used for deburring metal parts that have been punched out of stamping, and for thin plate-like workpieces with unevenness. Even when polishing a workpiece, it is easy to adapt to the work material, and in contrast to using a non-flexible prior art turret, the uniform ground and polished surface of the workpiece and the turret Can be ensured at the same time.

 The resinoid grindstone of the present invention is a grindstone in which abrasive grains are fixed with an epoxy resin. The epoxy resin that can be used in the present invention is a flexible epoxy resin. By using a flexible epoxy resin, an epoxy-based thermosetting resin composition that is a precursor composition for producing a turret and a grindstone that is a cured product have sufficient flexibility. You can have it. Due to this flexibility, the resinoid grindstone of the present invention can exhibit a high degree of elongation over a wide temperature range from a low temperature range to a high temperature range.

[0029] Further, the resinoid grindstone of the present invention has a compressive strength value of 5 to 20 MPa as measured according to JIS R1608 (Method for testing compressive strength of fine ceramics), and JIS R1602 (Fine It is preferable that the elastic modulus is 30 to 40 MPa as measured according to the elastic modulus test method of ceramics).

[0030] In order to obtain good performance over the grinding / polishing processing of the hard and brittle materials such as glass, silicon wafers and ceramic materials, which is the subject of the present invention, the abrasive and the binder must be excellent. It is important to provide flexibility and durability using an epoxy resin that achieves excellent wettability and is easy to manufacture. As a result of diligent research to provide powerful features to the boulder, as a boulder physical property value, the compressive strength value (measured in accordance with JIS R1608) is 5 to 20 MPa, and the elastic modulus (in accordance with JIS R1602) (Measurement) was found to be preferably 30 to 40 MPa. [0031] Generally, as the compressive strength value increases, the elastic modulus increases in proportion thereto. As the compressive strength value increases, the holding power of the abrasive grains increases and the durability of the grinding wheel improves, and the elastic modulus of the grinding wheel rises proportionally, and the flexibility of the grinding wheel is lost. When grinding a brittle material with such a grindstone, the elastic modulus is so high that the hard brittle material is destroyed by the impact during grinding or polishing, or chipping and microcracks are generated. For this reason, good grinding performance cannot be obtained for grinding and polishing of brittle materials such as glass, silicon wafers and ceramic materials. If the elastic modulus is lowered to cope with this problem, the compressive strength value also becomes lower, so that the consumption of the turret increases, the replacement frequency of the mortar increases, and the production efficiency decreases. Therefore, the present inventors use a flexible epoxy resin as a grindstone binder, pay attention to the compressive strength value and the elastic modulus as the grindstone physical properties, and adjust these physical properties to an appropriate range. If the compressive strength value (measured according to JIS R1608) is 5-20 MPa and the elastic modulus (measured according to JIS R1602) is 30-40 MPa It has been found that it exhibits good grinding performance.

 [0032] The compressive strength value is measured in accordance with JIS R1608, and is determined from the load when the test piece is broken by applying a compressive load by the following equation.

 [0033] Compressive strength value = 4 X (Fracture load) / (Specimen area)

 The elastic modulus is measured in accordance with JIS R1602, and the test piece is subjected to a bending test at three points, and the bending force of the test piece is obtained by the following equation.

[0034] Elastic modulus = {3 X (length of specimen) X (load 2—load 1MZ [2 X (width of specimen) X (thickness of specimen) ² X {(deflection dimension 2) — ( Deflection size 1)}]

 The compressive strength value is preferably 5 to 20 MPa. If the compressive strength value is less than 5MPa, the durability of the turret will be impaired, the consumption of the mortar will increase, and the production efficiency will deteriorate. If the compressive strength value is greater than 20 MPa, the holding power of the cannon will become too high and it will not wear out to form a cutting edge! The abrasive will not fall off and will be held on the grindstone, resulting in poor sharpness. The compressive strength value is more preferably 7 to 18 MPa.

[0035] The elastic modulus is preferably 30 to 40 MPa. If the elastic modulus is less than 30 MPa, the repulsive force is too high, and the barrel that becomes the cutting edge is recessed inside the turret, resulting in poor sharpness. If the modulus of elasticity is greater than OMPa, the resilience of the turret is insufficient and the brittle material is destroyed, or Chipping and microcracks occur. The elastic modulus is more preferably 35 to 40 MPa, and even more preferably 37 to 39 MPa.

[0036] The flexible epoxy resin is not particularly limited as long as it can exhibit flexibility even after being cured with an epoxy resin hardener. Examples of flexible epoxy resins that can be used include, but are not limited to, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and alkylene groups having 2 to 9 carbon atoms (preferably 2 to 4 carbon atoms). A polyglycidyl ether of a long-chain polyol containing polyoxyalkylene glycol containing polytetraalkylene ether glycol, etc .; glycidyl

Copolymer of (meth) acrylate and a radically polymerizable monomer such as ethylene, butyl acetate or (meth) acrylic acid ester; (co) polymer mainly composed of conjugated gen compound or partially hydrogenated product thereof (Co) Polymer double bond of unsaturated carbon in epoxy; Polyester resin having 1 or more, preferably 2 or more epoxy groups per molecule; Urethane bond or poly force prolataton bond introduced , Urethane modified epoxy resin, Polycaprolatatone modified epoxy resin; Dimer acid modified epoxy resin with an epoxy group introduced into the molecule of dimer acid or its derivatives; NBR, CTBN, polybutadiene, acrylic rubber, etc. Examples include rubber-modified epoxy resins with an epoxy group introduced into the molecule.

 [0037] An epoxy resin added with a flexibility-imparting agent can also be used. The flexibility imparting agent imparts flexibility to the cured epoxy resin by decreasing the crosslinking density and increasing the molecular weight between the crosslinking points. Examples of the compound used as the flexibility-imparting agent include monoepoxide, gepoxide, polyol, polythiol, polyethylene glycol, and polypropylene glycol.

 [0038] The same effect can be obtained by introducing a long-chain saturated or unsaturated fatty acid (for example, C is 10 or more) into the curing agent.

[0039] Preferably, the flexible epoxy resin is a dimer acid modified epoxy resin in which an epoxy group is introduced into the molecule of dimer acid or its derivative, which has a large effect of imparting flexibility and is easily available. . Specifically, although not limited thereto, dimer acid diglycidyl ester represented by the following chemical formula is preferred. [0040] [Chemical 1]

[0041] Further, the resinoid mortar of the present invention, for the purpose of imparting heat resistance and adjusting Z or elasticity, together with the flexible epoxy resin, is an aromatic glycidyl ether type epoxy resin. Fats may be used. Aromatic glycidyl ether type epoxy resin can be used up to 40% by weight based on the total weight of epoxy resin used. Amount of aromatic glycidyl ether type epoxy resin If it exceeds 40% by weight based on the total weight of the epoxy resin used, the resilience of the turret is lost, which is disadvantageous because the effect of the present invention is impaired.

 [0042] The aromatic glycidyl ether type epoxy resin includes aromatic diglycidyl ethers, aromatic triglycidyl ethers and aromatic polyglycidyl ethers.

 [0043] Representative examples of aromatic glycidyl ether type epoxy resins include, but are not limited to, the following formulas that are aromatic diglycidyl ethers:

 [0044] [Chemical 2]

[0045] Bisphenol A diglycidyl ester and the following formula:

[0046] [Chemical 3]

[0047] Bisphenol F diglycidyl ether of These are good against the barrel It can be suitably used in the present invention because it exhibits excellent adhesion and is readily available.

 [0048] Examples of other aromatic diglycidyl ethers include bisphenol S diglycidyl ether, resorcinol diglycidyl ether, and diglycidyl ether phthalate.

 [0049] Aromatic triglycidyl ethers include triglycidyl ether of trihydroxyphenol propane, glycidyl ether diglycidylamine of para-aminophenol, 4, 4-bis (4-hydroxyphenol pentanoic acid) di- Examples of the glycidyl ether glycidyl ester and aromatic polyglycidyl ethers include tetraphenyl-leneethane tetraglycidyl ether, tetraglycidyldiaminodiphenylmethane, tetraglycidylmetaxylenediamine, cresolyl novolac polyglycidyl ether, and the like.

 [0050] In addition, epoxy resins other than those exemplified above can be used as long as the effects of the present invention are not impaired.

 [0051] The resinoid grindstone of the present invention has a specific flexibility represented by a compressive strength value of 5 to 20 MPa (measured according to JIS R1608) and an elastic modulus of 30 to 40 MPa (measured according to JIS R1602). It has the property. When dimer acid modified epoxy resin is used as the flexible epoxy resin, the flexibility of the resinoid grinding wheel of the present invention is determined by the following three parameters (rubber hardness, 25% compression hardness, rebound resilience) It can be defined even if it is called.

1. Rubber hardness

 Rubber hardness is measured using a rubber hardness meter (A scale).

 2. 25% compression hardness

 The 25% compression hardness is measured according to the following procedure specified in JIS K6767 (Foamed Plastics-Polyethylene-Test Method). Figure 2 shows a conceptual diagram showing the measurement method.

(1) Place the test stone 2 on the base 3 of a suitable testing machine.

 (2) With the pressing direction 4 from the top to the bottom in the vertical direction, the tester's load measurement pressurizing head 1 compresses it by 25% of the initial thickness of the test wheel 2 at a compression speed lOmmZmin and stops. 2 Measure the load (N) after 0 seconds.

(3) From the cross-sectional area of test boulder 2 and the load after 20 seconds, the 25% compression hardness value (MPa )

[0052] 25% compression hardness value (MPa) = Load after 20 seconds (N) Cross-sectional area of Z test turret (mm ² ) 3. Rebound resilience

 The impact resilience is measured using the following procedure with reference to JIS K6255 (Rebound resilience test method for vulcanized rubber and thermoplastic rubber). Figure 1 shows a conceptual diagram showing the measurement method.

(1) Prepare 1Z4 inch steel ball 5 for Rockwell hardness measurement.

 (2) Install the test wheel 2.

 (3) Test wheel 2 Drop the steel ball 5 with a drop height force of 2 to 200 mm.

 (4) The 1Z4 inch steel ball 5 hits the test boulder 2 and the bounce height is measured.

(5) From the drop height and rebound height, obtain the rebound resilience (%) by the following formula.

[0053] Rebound resilience (%) = Rebound height (mm) Z drop height (200mm) X 100

 In the resinoid mortar of the present invention, the rubber hardness is preferably 50 to 90 as measured by a rubber hardness meter A scale. If the rubber hardness is less than 50, the grindstone becomes soft and strong, which is inconvenient because the polishing power is insufficient. On the other hand, if the rubber hardness is higher than 90, the turret becomes hard, the flexibility is lost, and chipping and microcracks tend to occur. In the resinoid mortar of the present invention, the hardness is more preferably 55 to 90, and most preferably 60 to 90, as measured by a rubber hardness meter A scale.

 [0054] The resinoid mortar of the present invention preferably has a rebound resilience of 5 to 20%.

 If the impact resilience is less than 5%, the turret becomes soft, the pressure responsiveness to the polishing pressure becomes poor, and the sharpness is lowered, which is inconvenient. Further, it is not preferable because the pressure response when the polishing pressure is changed is deteriorated. On the other hand, if the impact resilience exceeds 20%, the turret becomes hard and chipping and microcracks occur.

[0055] In the resinoid grindstone of the present invention, the 25% compression hardness (JIS K6767) is preferably 1.0 to 35 MPa. A 25% compression hardness of less than 1. OMPa is inconvenient because the grindstone softens and lacks polishing power. On the other hand, if the 25% compression hardness is greater than 35 MPa, the boulder is hard and pressure responsiveness to the polishing pressure is deteriorated, chipping and micro cracks are generated, and the boulder may be destroyed in some cases. In the resinoid grindstone of the present invention, the 25% compression hardness is more preferably 1.0 to 25 MPa. More preferably, it is 1.5 to 20 MPa, and most preferably it is 2.0 to 18 MPa.

[0056] The bullets that can be used in the present invention are not limited to these, but in general, alumina-based abrasive grains, silicon carbide-based abrasive grains, zirconia-based abrasive grains, cerium oxide, silica, oxide 1 One or more types selected from the group of chromium, CBN abrasives, and diamond abrasives. The combination can be appropriately selected according to conditions such as grinding and the material of the material to be ground. Further, as long as the effects of the present invention are not impaired, the other than those exemplified above can be used.

 [0057] The grain size of the abrasive grains is less than 1 μm from F4 (3rd stage sieve opening 4.75mm) specified in JIS R6001 (Gritiness of grinding and grinding abrasives). Applicable to diameters up to 0.1 μm.

 [0058] The resinoid grindstone of the present invention may contain a filler! Examples of the filler include silica, talc, cryolite, barium sulfate, potassium sulfate, calcium carbonate, and the like, which can be appropriately selected depending on grinding conditions and the like.

 [0059] Further, the resinoid mortar of the present invention may be made porous in order to synergistically enhance its effect. By increasing the amount of pores in the grindstone and making the grindstone porous, grinding resistance can be reduced and grinding burn can be prevented. The pores can be found in the precursor composition of the wheel, surfactant, solid (eg, foamed polystyrene, polymethylmethacrylate, rubber or plastic foaming agent) and Z or liquid (eg, diisopropylazodicarboxylate). It can be formed by adding a pore forming agent. The materials of the surfactant and the pore forming agent are not particularly limited as long as the effects of the present invention are not impaired. The pores may be formed by stirring the precursor composition of the grindstone and forcibly entraining the bubbles.

[0060] Te resinoid grindstone Nio, the present invention, the abrasive volume ratio is 5 vol% to 55 vol _^0/0, air pore volume ratio is 5 vol% to 80 vol%, binder ratio Is preferably a value obtained by subtracting the abrasive volume ratio and the pore volume ratio from 100%.

 Next, a preferred embodiment of the method for producing a resinoid mortar according to the present invention will be described.

[0062] First, a flexible epoxy resin and optionally an aromatic glycidyl ether type epoxy resin are prepared in a liquid state and mixed. Next, an amount of curing agent based on the epoxy equivalent of epoxy resin is added to these mixtures and mixed until uniform. Further if necessary The filler, surfactant, liquid and Z or solid pore former are added and mixed to obtain a uniform mixture. To this mixture, abrasive grains, and if necessary, other fillers, solid pore-forming agents and the like are added and stirred to obtain a uniform dispersion. Next, this dispersion is poured into an arbitrary mold and heated at 40 to 90 ° C. for about 2 to 6 hours to obtain a primary cured product. After demolding the primary cured product, when the curing reaction is completed by heating at 120-160 ° C. for about 3-9 hours, a resinoid grindstone according to the present invention is obtained. When a pore forming agent is used, the heating process promotes the formation of a porous structure.

[0063] Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. These illustrate the feasibility and usefulness of the present invention, and do not limit the configuration of the present invention. Absent.

 Example

[0064] (Example 1)

Production of resinoid grinding wheel of the present invention using the dimer acid diglycidyl ester 80 wt% and bisphenol F diglycidyl ether 20 weight _^0/0 is a flexible epoxy榭脂as binder

 The grindstone of this invention was manufactured using the raw material shown below.

 Abrasive: GC # 220 1000 parts by weight

 Binder: Dimer acid diglycidyl ester liquid 372 parts by weight

 (Toto Kasei Co., Ltd., part number YD—171)

 Bisphenol F diglycidyl ether liquid 93 parts by weight

 (Toto Kasei Co., Ltd., product number YDF—170)

 Curing agent: 59 parts by weight of amine curing agent

 Filler: Aerosil (silica fine powder) 1 part by weight

 Surfactant: 10 parts by weight of non-ionic surfactant

First, a predetermined part by weight of dimer acid diglycidyl ester and bisphenol F diglycidyl ether prepared in a liquid state and a part by weight of a curing agent based on the epoxy equivalent are put into a stirring vessel, and then a predetermined part. Weight part of Aerosil was mixed and mixed until uniform. Next, add a predetermined weight part of the barrel to this mixture and mix until uniform. It was. The obtained mixture was poured into a molding die having a predetermined size and heated at 70 ° C. for about 4 hours to obtain a primary cured product. After demolding the primary cured product, it was further heated at 145 ° C for about 6 hours to complete the curing reaction. The resulting cured product was finished to obtain a grindstone. The composition of the produced grindstone was 28% abrasive volume, 40% binder, and 32% pore volume based on the total volume of the grindstone.

(Example 2)

Production of resinoid grindstone use, was present invention flexible 90 wt% dimer acid diglycidyl ester epoxy榭脂as a binder and a bisphenol F diglycidyl ether 10 weight ^_0/0

 A grindstone of the present invention was produced according to the same procedure as in Example 1 using the raw materials shown below.

Abrasive: GC # 220 1000 parts by weight

Binder: Dimer acid diglycidyl ester liquid 423 parts by weight

 (Toto Kasei Co., Ltd., part number YD—171)

 Bisphenol F diglycidyl ether liquid 47 parts by weight

 (Toto Kasei Co., Ltd., product number YDF—170)

Curing agent: 53 parts by weight of amine curing agent

Filler: Aerosil (silica fine powder) 1 part by weight

Surfactant: 10 parts by weight of non-ionic surfactant

 The composition of the manufactured grindstone was, based on the total volume of the grindstone, an abrasive volume ratio of 26%, a binder volume ratio of 37%, and a pore volume ratio of 37%.

(Comparative Example 1)

 Production of porous resinoid wheel using bisphenol F diglycidyl ether as binder

 A conventional grinding wheel disclosed in Japanese Patent Laid-Open No. 2004-160646 was manufactured using the following raw materials.

Abrasive: GC # 1000 1000 parts by weight

Binder: Bisphenol F diglycidyl ether liquid 755 parts by weight (Toto Kasei Co., Ltd., product number YDF—170)

Curing agent: 191 parts by weight of amine curing agent

Surfactant: 10 parts by weight of non-ionic surfactant

Filler: 380 parts by weight of talc

Liquid foaming agent: 30 parts by weight of diisopropyl azodicarboxylate

 First, a predetermined part by weight of liquid epoxy resin (bisphenol F diglycidyl ether), a curing agent and a surfactant were put into a stirring vessel and mixed until uniform. Next, a predetermined part by weight of talc and barrels were collected and mixed until uniform. Next, a predetermined part by weight of diisopropyl azodicarboxylate was collected, and further stirred until a desired bubble entrainment state was obtained, and mixed until uniform. The obtained mixture was poured into a mold for casting and heated at 90 ° C. for 1 hour to obtain a primary cured product. After demolding the primary cured product, it was further heated at 150 ° C for about 6 hours to complete the curing reaction. The obtained hardened material was finished to obtain a grindstone. The composition of the manufactured whetstone was, based on the total volume of the whetstone, an abrasive volume ratio of 7.5%, a binder volume ratio of 22.5%, and a pore volume ratio of 70%.

(Physical property evaluation test)

 In Examples 1 to 2 and Comparative Example 1, the physical properties evaluation tests of rubber hardness, rebound resilience and 25% compression hardness were conducted according to the following procedures.

1. Physical property evaluation procedure

1-1. Rubber hardness

 Hardness was measured using a rubber hardness meter (A scale).

1-2.25% compression hardness

 The 25% compression hardness value was measured in accordance with the following procedure specified in JIS K6767 (foamed plastic polyethylene test method). Figure 2 shows a conceptual diagram showing the measurement method.

(1) Cut out the turrets obtained in the examples and comparative examples into 127 x 35 x 85 mm rectangular parallelepipeds and prepare them as test wheels 2.

(2) Set the 127 x 35 mm surface of the test wheel 2 as the compression surface and place it on the lower base 3 of the Autograph AG-10TD testing machine manufactured by Shimadzu Corporation. (3) With the pressure direction 4 from the top to the bottom in the vertical direction, the load measuring pressure head 1 of the test machine compresses by 25% of the initial thickness of the test stone 2 at the compression speed lOmmZmin and stops. 2 Measure the load (N) after 0 seconds.

 (4) The 25% compression hardness value (MPa) is obtained from the cross-sectional area of the test boulder 2 and the load after 20 seconds using the following formula.

[0065] 25% compression hardness (MPa) = load after 20 seconds (N) cross section of Z test turret (mm ² )

 1-3. Rebound resilience

 The rebound resilience was measured according to the following procedure with reference to JIS K6255 (Rebound resilience test method for vulcanized rubber and thermoplastic rubber). Figure 1 shows a conceptual diagram showing the measurement method.

(1) Prepare 1Z4 inch steel ball 5 for Rockwell hardness measurement.

 (2) The turret obtained in the example and the comparative example is cut into a 127 × 35 × 85 mm rectangular parallelepiped and prepared as a test wheel 2.

 (3) Test wheel 2 Drop the steel ball 5 with a drop height force of 2 to 200 mm.

 (4) The 1Z4 inch steel ball 5 hits the test boulder 2 and the rebound height bounced is measured.

(5) From the drop height and rebound height, obtain the rebound resilience (%) by the following formula.

[0066] Rebound resilience (%) = Rebound height (mm) Z drop height (200mm) X 100

 2.Test results

 Table 1 shows the physical property evaluation test results of the grinding stones manufactured in Examples 1-2 and Comparative Example 1.

 [0067] [Table 1] Table 1 Physical property test results

[0068] 2— 1. Rubber hardness value

The rubber hardness is 84 in Example 1 and 75 in Example 2, which is lower than 98 in Comparative Example 1. there were. This result shows that the grindstone of the present invention is soft.

2- 2. 25% compression hardness

 The 25% compression hardness was 7.3 MPa in Example 1 and 4.4 MPa in Example 2, but in Comparative Example 1, the grindstone was broken and could not be measured. This result shows that the grindstone of the present invention is less brittle than the prior art turret of Comparative Example 1.

2- 3. Rebound resilience

 The rebound resilience was 16% in Example 1 and 13.5% in Example 2, which was a lower value than 25% in Comparative Example 1. This result shows that the turret of the present invention has a high ability to absorb impact or load.

(Grinding test)

 A grinding test was conducted using the test wheels manufactured in Examples 1 and 2 and Comparative Example 1. The grinding performance of the grinding wheel was measured by measuring the grinding resistance, the amount of work material removed, and the finished surface roughness. Was evaluated.

 1. Grinding conditions

 A grinding test was performed according to the following conditions.

Grinding wheel Dimensions: Outer diameter 200mm X Thickness 15mm X Hole diameter 50.8mm

 Shape: 1 A type

Work Material: TFT LCD glass

 Dimensions: Length 100mm X Width 100mm (cut out)

Grinding fluid Name: Sauce cut NS 201

 Concentration: 2%

 Flow rate: 500mlZs (301 / min)

Grinding machine Type: Horizontal axis surface grinding machine manufactured by Okamoto

 Model: CNC—52B (7.5 kw)

Touring and dressing conditions

 Trua: Taishi Dresser

 Wheel peripheral speed: 40mZs

Crane feeding speed: 8.3 mm / s Knolling Reed: 0.16mm / rev

 Grinding conditions Grinding method: Plane plunge grinding

 Wheel peripheral speed: 40mZs

 Tape glue speed: 83.3 mm / s

 Off: iA: 0.5 μ / pass

 Surface roughness before grinding test: 3. Ο μ mR¾ [adjusted to IS

 2.Test results

 The grinding performance of the grinding wheel was evaluated by measuring the grinding resistance, the amount of work material removed, and the finished surface roughness.

 2-1 Grinding resistance

 Table 2 shows the results of grinding resistance.

[0069] [Table 2] Table 2 Grinding resistance (NZmm)

[0070] In the grinding test using the turret of Comparative Example 1, the grinding resistance increased at a set depth of 100 m and showed an abnormal value. Therefore, the subsequent grinding tests were stopped. This result shows that the grindstone in Comparative Example 1 is a porous grindstone. Because the flexible ladle and epoxy resin are used as the binder, the set depth is absorbed by the binder component. This is thought to be due to abnormal load conditions. On the other hand, although the resinoid mortar according to the present invention of Examples 1 and 2 had a smaller porosity than the calculus of Comparative Example 1, no abnormal increase in polishing resistance was observed. This result is considered to be due to the fact that the set incision was absorbed by the binder component because a flexible epoxy resin was used as the binder.

2- 2.Work material removal amount Table 3 shows the results of the amount of work material removed.

[0071] [Table 3] Amount of work material (brightness)

 [0072] Since the conditions of the grinding test are intended for finishing, the amount of work material removal was generally small compared to the normal case. Excluding Comparative Example 1 where the grinding test was stopped, the amount of work material removed was greater when Example 1 was used than when Example 2 was used. This result can be attributed to the fact that the quantitative ratio of the flexible epoxy resin used as the binder to the aromatic glycidyl ether type epoxy resin matched the grinding conditions. Therefore, in the present invention, by appropriately changing the quantitative ratio between the flexible epoxy resin and the aromatic glycidyl ether type epoxy resin, it is possible to provide a grindstone suitable for the grinding conditions.

 2-3. Finished surface roughness

 Table 4 shows the results of the finished surface roughness of the work material.

[0073] [Table 4] Finishing (umR z J I S)

一般的に、砥粒の粒径と仕上げ面粗度の関係においては、砥粒の平均粒径が大 きいほど仕上げ面粗度が粗くなるのが通常である。し力しながら、表 4の結果をみると 、平均粒径の大きい # 220の砲粒が使用された実施例 1及び 2の砥石では、平均粒 径の小さい # 1000の砲粒が使用された比較例 1の砲石と比較して、特に設定切込 み 300 mまで研削して、ほぼ同等の仕上げ面粗度が得られた。

In general, in the relationship between the grain size of the abrasive grains and the finished surface roughness, it is normal that the finished surface roughness becomes rougher as the average grain size of the abrasive grains becomes larger. However, when looking at the results in Table 4, the grindstones of Examples 1 and 2 in which the # 220 barrel with a large average particle size was used, the average particle size Compared with the turret of Comparative Example 1 in which a small diameter # 1000 cannon was used, grinding to a set depth of 300 m gave almost the same finished surface roughness.

 Conventionally, to prevent chipping and microcracks, it is common to use a small average particle size, and using the # 1000 particle size will minimize the effect of chipping. It is done. According to the results of grinding tests, the finished surface roughness is V with a large average grain size, and Examples 1 and 2 where # 220 barrels are used and the grain size is small! /, # 1000 barrels are used. Therefore, the resinoid granules according to the present invention are excellent in that chipping and microcracks are prevented by using a flexible epoxy resin as a binder. It is considered that surface roughness has been achieved.

(Example 3)

Production of resinoid grindstone use, was present invention flexible 90 wt% dimer acid diglycidyl ester epoxy榭脂as a binder and a bisphenol F diglycidyl ether 10 weight ^_0/0

 A grindstone of the present invention was produced according to the same procedure as in Example 1 using the raw materials shown below.

Abrasive: GC # 180 1000 parts by weight

Binder: Dimer acid diglycidyl ester liquid 423 parts by weight

 (Toto Kasei Co., Ltd., part number YD—171)

 Bisphenol F diglycidyl ether liquid 47 parts by weight

 (Toto Kasei Co., Ltd., product number YDF—170)

Curing agent: 53 parts by weight of amine curing agent

Filler: Aerosil (silica fine powder) 1 part by weight

Surfactant: 10 parts by weight of non-ionic surfactant

 The composition of the manufactured grindstone was, based on the total volume of the grindstone, an abrasive volume ratio of 26%, a binder volume ratio of 37%, and a pore volume ratio of 37%.

(Example 4)

The present invention uses 75% by weight of bisphenol A type epoxy resin, which is a flexible epoxy resin, and 25% by weight of bisphenol F diglycidyl ether, which is not flexible. Of resinoid grinding wheels

 A grindstone of the present invention was produced according to the same procedure as in Example 1 using the raw materials shown below.

Abrasive: GC # 180 1000 parts by weight

Binder: Bisphenol A type epoxy resin 209 parts by weight

 (Nagase Chemtech Co., Ltd., product number XN1019, heat-curing flexible epoxy resin) Bisphenol F diglycidyl ether liquid 70 parts by weight

 (Product number YDF—170, manufactured by Tohto Kasei Co., Ltd.)

Curing agent: 230 parts by weight of aliphatic polyamine curing agent

 (Nagase Chemtech Co., Ltd., part number XN 1124 Heat-curing flexible epoxy resin part number XN1019)

Filler: Aerosil (silica fine powder) 2 parts by weight

Surfactant: 2 parts by weight of silane coupling agent

 (Product number KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.)

 The composition of the manufactured grindstone was, based on the total volume of the grindstone, an abrasive grain volume ratio of 29.3%, a binder volume ratio of 41.1%, and a pore volume ratio of 29.6%.

(Comparative Example 2)

 Production of porous resinoid wheel using bisphenol F diglycidyl ether as binder

 A conventional grinding wheel disclosed in Japanese Patent Laid-Open No. 2004-160646 was manufactured using the following raw materials.

Abrasive: GC # 180 1000 parts by weight

Binder: Bisphenol F diglycidyl ether liquid 755 parts by weight

 (Toto Kasei Co., Ltd., product number YDF—170)

Curing agent: 191 parts by weight of amine curing agent

Surfactant: 10 parts by weight of non-ionic surfactant

Filler: 380 parts by weight of talc

Liquid foaming agent: 30 parts by weight of diisopropyl azodicarboxylate The composition of the manufactured whetstone is based on the total volume of the whetstone, and the abrasive volume ratio is 19.9%, the binder volume ratio is 30.1%, the filler volume ratio is 5.3%, and the pore volume ratio is 52.7%. Met.

 (Physical property evaluation test)

 The mortar manufactured in Example 3 and Example 4 and Comparative Example 2 was subjected to a physical property evaluation test of the cartridge, compressive strength value, and elastic modulus according to the following procedure.

 1. Physical property evaluation procedure

 1-1. Compressive strength value

 The compressive strength value is measured in accordance with JIS R1608, and is calculated from the load when the specimen is broken by applying a compressive load, using the following formula.

[0076] Compressive strength value = 4 X (breaking load) / (test specimen area)

 (1) Cut each turret manufactured in Examples and Comparative Examples into a 16 x 16 x 12 mm cuboid and prepare as test pieces.

 (2) Set the 16 x 16 mm surface of the test piece as the compression surface, and place it on the bottom of the Autograph AG-10TD testing machine manufactured by Shimadzu Corporation.

 (3) The test piece is compressed at a compression speed of 3. OmmZmin using the pressure measuring head of the testing machine with the pressure direction from top to bottom as the pressurization direction, and the load when it breaks is recorded.

 (4) Compressive strength value = 4 X (Fracture load) Z (Specimen area)

 1-2. Elastic modulus

 The elastic modulus is measured in accordance with JIS R1602, and the test piece is subjected to a bending test at three points, and the bending force of the test piece is obtained by the following equation.

[0077] Elastic modulus = {3 X (length of specimen) X (load 2—load 1MZ [2 X (width of specimen) X (thickness of specimen) ² X {(deflection dimension 2) — ( Deflection size 1)}]

 (1) Cut each turret manufactured above into a 16 x 12 x 100 mm cuboid and prepare it as a test piece.

 (2) Perform three-point bending strength using an autograph AG-10TD tester manufactured by Shimadzu Corporation.

(3) Head speed 3. Apply load with Omm / min, span distance 60mm.

 (4) Measure the deflection of the test piece and obtain the elastic modulus according to the following formula.

[0078] Elastic modulus = {3 X (length of specimen) X (load 2—load 1MZ [2 X (width of specimen) X (test Piece thickness) ² X {(deflection dimension 2) — (deflection dimension 1)}]

 2.Test results

 Table 5 shows the physical property evaluation test results of the turrets produced in Examples 3 and 4 and Comparative Example 2.

[0079] [Table 5] Table 5 Physical properties! Results of ffiii ^

[0080] Compared to Example 3, the compressive strength value of Example 4 is about twice, the compressive strength value of Comparative Example 2 is about 4 times, the elastic modulus of Example 4 is the same, and the elastic modulus of Comparative Example 2 Was about 4 times. We will examine how this difference in physical properties affects grinding performance.

 (Polishing test)

 Example 3, Example 4 and Comparative Example 2 had the same raw material mixture composition, and a polishing test was conducted using a grindstone manufactured by changing the grain size of the abrasive grains from # 180 to # 220.

1. Polishing conditions

 A polishing test was performed according to the following conditions.

 Grinding wheel Dimensions: Outer diameter 200mm X Thickness 15mm X Hole diameter 50.8mm

 Shape: 1 A type

 Work Material: TFT glass

 Dimensions: Thickness 0.5mm X Height 7mm X Length 40mm

 Grinding fluid Tap water with fungicide

 Grinding machine Type: Horizontal axis surface grinding machine manufactured by Okamoto

Model: CNC—52B (7.5 kw) Touring and dressing conditions

 Trua: Taishi Dresser

 Wheel peripheral speed: 33mZs

 Crane feeding speed: 8.3 mm / s

 A crane lead: 0.16mm / rev

 Polishing conditions Grinding method: Plane plunge grinding

 Wheel peripheral speed: 33mZs

 Feeding speed: 8mmZs

 Cutting pressure: 0.8 kg X 80pass

 Surface roughness before grinding test: 3. Ο μ mR¾ [adjusted to IS

 2.Test results

 The grinding performance of the grinding wheel was evaluated by measuring the amount of work material cutting and the amount of grinding wheel consumption.

 [0081] The amount of work material cut was determined by measuring the dimensions of the TFT glass, which is the work material, before and after polishing.

 (mm). The grinding wheel consumption was determined by measuring the grinding wheel dimensions before and after grinding (mm).

 The results are shown in Table 6.

[0083] [Table 6] Results of study

[0084] The turret of Comparative Example 2 was destroyed immediately after the start of the test. The turret of Comparative Example 2 has a high compressive strength value, so the durability of the turret is expected, and thus the expected force. It is thought that it was destroyed because it could not withstand the polishing pressure. In the grindstones of Example 3 and Example 4, the mortar was not destroyed and could be polished normally. This is a ratio The reason is that the elastic modulus was lower than that of the comparative example.

 [0085] The amount of cutting in Example 3 and Example 4 was the same. This is considered to reflect this physical property value because the elastic modulus was the same in the physical property test.

[0086] It can be said that Example 4 has half the mortar consumption compared to Example 3 and has twice the durability. This is because the compressive strength value of Example 4 is twice that of Example 3 in terms of physical property values, and this physical property value is considered to reflect the durability of the grindstone.

 Industrial applicability

[0087] The resinoid grindstone according to the present invention can be used for cylindrical grinding | J, surface grinding and internal grinding for the purpose of rough grinding and finish grinding, and also applied to final finishing such as hounging. be able to. As a work material, force applicable to ferrous materials and non-ferrous materials, especially grinding hard and brittle materials such as carbide, silicon, alumina, carbide, nitride, sapphire, quartz, various glass, and other ceramic materials. It can be suitably applied to polishing, and is particularly preferably used for finish polishing of the edge of a TFT liquid crystal glass material. In addition, the resinoid mortar according to the present invention is also suitably used for deburring of press-punched metal parts, polishing of uneven thin plate-like workpieces, and control turrets for centerless grinding. be able to.

Claims

The scope of the claims  [1] The resinoid grindstone, wherein the abrasive grains are fixed with an epoxy resin and the epoxy resin is a flexible epoxy resin.  [2] The resinoid mortar has a compressive strength value (measured according to JIS R1608) of 5 to 20 MPa and an elastic modulus (measured according to JIS R1602) of 30 to 40 MPa. Claims 1 Resinoid grinding wheel. [3] The flexible epoxy resin is a dimer acid-modified epoxy resin The resinoid mortar according to claim 1 or 2. [4] The epoxy resin according to any one of claims 1 to 3, wherein the epoxy resin contains aromatic glycidyl ether type epoxy resin up to 40% by weight based on the total weight of the epoxy resin. Resinoid grinding wheel. [5] The aromatic glycidyl ether type epoxy resin is a bisphenol A type epoxy resin or a bisphenol F type epoxy resin. Resinoid cannonstone. [6] Claims 1-5, wherein the resinoid grindstone is made into multi-pores by using a powder or liquid foaming agent, an inorganic or organic pore-forming agent, or a surfactant. Any force Resinoid wheel according to item 1. [7] The resinous mortar according to any one of claims 1 to 6, wherein the resinous mortar is 50 to 90 as measured by rubber hardness A scale. [8] The resinoid grindstone according to any one of claims 1 to 7, wherein the resinoid grindstone has a 25% compression hardness (JIS K6767) force of 1.0 to 35. OMPa. [9] The rebound resilience modulus of the resinoid mortar is 5 to 20%, according to claims 1 to 8! , Resinoid grinding wheel according to item 1.