KR20140123038A - Dressing method for glass substrate edge-grinding grindstone and glass substrate manufacturing method using said dressing method - Google Patents

Abstract

The present invention relates to a dressing method of a grinding wheel for grinding an end face of a glass substrate, wherein a glass substrate is used as a dressing material, and the feeding speed of the glass substrate used as a dressing material is adjusted by grinding an end face So that the grinding amount of the glass substrate used as the dressing material becomes larger than the grinding amount of the glass substrate when the end face is subjected to grinding processing at the time of manufacturing the product, And a method of manufacturing a glass substrate using the dressing method. The present invention relates to a method of dressing a grinding wheel for grinding an end face of a glass substrate, and a method of manufacturing a glass substrate using the dressing method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of dressing a grinding wheel for grinding an end face of a glass substrate, and a method of manufacturing a glass substrate using the dressing method.

The present invention relates to a dressing method of a grinding wheel for grinding an end face of a glass substrate and a method of manufacturing a glass substrate using the dressing method.

A glass substrate such as a plate glass or a liquid crystal panel is processed into a glass substrate having an outer diameter dimension by grinding and chamfering the end faces of four sides after cutting to a predetermined size.

The grinding processing for grinding and chamfering is performed by rotating a cylindrical grinding wheel having a groove formed along the circumferential direction on its side face and bringing the end face of the glass substrate, which is the grinding target, into contact with the groove portion (groove surface) Or by moving a glass substrate or a grinding stone (for example, Patent Document 1).

The grinding process on the end face of the glass substrate can be continuously performed on a plurality of glass substrates. However, as the grinding amount increases, loading on the surface of the grinding wheel groove is clogged, Shedding, etc., and the processing ability of the grinding stone is lowered. For this reason, dressing is performed to stop the end face grinding apparatus of the glass substrate periodically and sharpen the sharpness of the grinding wheel to restore its ability.

Japanese Patent Application No. 2010-268055

However, according to the conventional dressing method, it is necessary to stop the end face grinding apparatus while the dressing is being performed, and bring the dressing member into contact with the end face grinding stone.

As a result, there is a problem that the operating rate of the end face grinding apparatus is lowered and the productivity is lowered.

In addition, since the worker carries out the dressing by manual operation, there arises a deviation in the state of the surface of the groove of the grinding wheel after the dressing by the operator, and even if the dressing is performed, the grinding ability of the grinding wheel is not restored, The shape of the part may be deformed.

The present invention has been made in view of the above problems in the prior art, and it is an object of the present invention to provide a method for dressing a glass substrate, which is capable of dressing without stopping the end face grinding apparatus of the glass substrate, And a method for dressing a grinding wheel for surface grinding.

According to one embodiment of the present invention, there is provided a dressing method of a grinding wheel for grinding an end face of a glass substrate, wherein a glass substrate is used as a dressing material and a feeding speed of the glass substrate used as a dressing material is set to, So that the grinding amount of the glass substrate used as the dressing material becomes larger than the grinding amount of the glass substrate when the end face is subjected to the grinding processing at the time of manufacturing the product, There is provided a method of dressing a grinding wheel for grinding an end face of a glass substrate, characterized in that the glass substrate to be used as a dressing material is supplied to the end face grinding stone.

According to another aspect of the present invention, there is provided a method of manufacturing a product, comprising the steps of: grinding the end face of the glass substrate with a first grinding amount while feeding the glass substrate to the end face grinding grindstone at a first feed speed; A step of judging whether or not the dressing of the end face grinding wheel is necessary at a timing when the dressing is required; A dressing step of grinding an end face of the glass substrate with a second grinding amount larger than the first grinding amount while being fed at a feeding speed

A method for manufacturing a glass substrate is provided.

Fig. 1A is a side view of an end face grinding apparatus for a glass substrate according to an embodiment; Fig.
1B is a top view of an end face grinding apparatus for a glass substrate according to an embodiment.
Fig. 2 is an explanatory diagram of an end face grinding grindstone used in an end face grinding apparatus for a glass substrate according to an embodiment. Fig.
3 is a control flowchart of a dressing according to the embodiment;
4A is an observation view of a groove surface of a grinding wheel after dressing of Example 3-1 in Example 3. Fig.
4B is an observation view of a groove surface of a grinding wheel before the start of use of Example 3-1 in Example 3. Fig.
Fig. 4C is an observation view of the groove surface of the grinding wheel of Example 3-2 after dressing in Example 3; Fig.
4D is an observation view of the groove surface of the grindstone before use of Example 3-2 in Example 3. Fig.
5 is a diagram showing an example of a configuration of a controller.

Hereinafter, the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and substitutions may be made to the embodiments without departing from the scope of the present invention. have.

In this embodiment, a dressing method of a grinding wheel for grinding an end face of a glass substrate will be described.

First, a structural example of an end face grinding apparatus for a glass substrate provided with a grinding wheel for end face grinding will be described with reference to Figs. 1A, 1B and 2.

1A and 1B are schematic views of an end face grinding apparatus 10 of a glass substrate, in which FIG. 1A is a side view and FIG. 1B is a top view. The dressing method of the present embodiment is not limited to this end face grinding apparatus.

The rectangular workpiece W (glass substrate) to be ground is held on the holding means 11 so as to be detachable from the holding means 11 in an exposed state. The holding means 11 is disposed on the traveling body S which can be moved in the left and right directions (arrow directions in Figs. 1A and 1B) in Fig. 1, and the traveling body S is supported by the carrying mechanism 12 So that the work W can be conveyed in the left-right direction. The conveying mechanism 12 can be configured to control the conveying speed (conveying speed) of the work W by the controller 100 (control unit), which will be described later.

The work W held on the holding and holding means 11 is conveyed to the position where the grinding mechanism 13 is installed by the conveying mechanism 12 and subjected to grinding and chamfering Hereinafter simply referred to as grinding processing) is performed. 1B, the grinding mechanisms 13 are arranged one by one in the right and left (in the direction orthogonal to the carrying direction of the workpiece W) of the transport mechanism 12 (in FIG. 1A, A plurality of grinding mechanisms may be arranged in the carrying direction by changing the type and roughness of the grinding wheel, such as rough grinding or finishing.

It is preferable that the grinding mechanism 13 is configured to be able to change the distance between the work W and the work W manually or automatically so as to adjust the grinding amount (grinding width). Specifically, for example, it is preferable that the grinding mechanism 13 is provided with a servo mechanism or the like. In the present embodiment, the position of the grinding tool 13 (the distance to the workpiece W) can also be controlled by the controller 100 (control unit) described later.

As shown in Fig. 1B, the grinding mechanism 13 includes a cylindrical grinding wheel 132 (hereinafter, simply referred to as a "grinding wheel") for grinding the end face in a cylindrical shape, a grinding wheel 132 for grinding processing, And a motor 131 for rotating the grinding wheel 132 with the central axis of the grinding wheel 132 as a rotation axis. Further, at the time of polishing, the used coolant is introduced through the coolant supply mechanism 14 and the duct L for supplying the coolant (coolant) around the portion where the grindstone 132 and the work W come into contact with each other The suction mechanism 15 can be connected to the grinding mechanism 13. [

Normally, the coolant supplied to the periphery of the portion where the grindstone and the work W make contact during polishing by the coolant supply mechanism 14 is recovered by the suction mechanism 15, And is being circulated. Therefore, when a dressing material of a material different from that of the workpiece W (glass substrate) of the object to be polished is used as in the conventional dressing method, the dressing material is mixed in the coolant, There is a problem that scratches are generated on the workpiece W due to the above. However, according to the dressing method of the present embodiment, since the glass substrate is used as the dressing material, the foreign matter (different from the object to be ground) is not mixed into the coolant even after the dressing, can do.

The kind of the grindstone 132 is not particularly limited, and for example, a diamond grindstone can be used. A groove 132 (a) is formed on the side surface (circumferential surface) of the grinding wheel 132 as seen from a lateral side view of the grinding wheel shown in Fig. 2, The grinding processing of the end face of the work W is carried out by carrying the work W while bringing the work W into contact with the grooves. At this time, the chamfering of the end face of the work W is performed in accordance with the surface shape of the groove. 2, one groove 132 (a) is formed. However, for example, a plurality of grooves may be formed at predetermined intervals in the axial direction, and when the end surface grinding apparatus is continuously operated, Depending on the amount of grinding, the groove to be used may be switched.

Here, the end surface grinding apparatus for carrying the work W and grinding the end surface thereof has been described. However, the grinding apparatus 13 may be configured to move the work W by fixing the work W, W and the grinding mechanism 13 may be conveyed and moved.

The dressing method according to the present embodiment will be described below with respect to the dressing method of the end face grinding wheel disposed in the grinding apparatus in the above-described end face grinding apparatus for a glass substrate as described above.

When grinding is carried out under ordinary grinding processing conditions (product manufacturing conditions), phenomena such as loading of clogged eyes on the surface of the groove of the grinding wheel due to chips (grinding debris) and shading in which the grains are dropped may occur, The ability drops.

The dressing method of the present embodiment uses a glass substrate as a dressing material so that the feeding speed of the glass substrate is slower than the condition for grinding the end face at the time of manufacturing a normal product and the grinding amount of the glass substrate is increased , The glass substrate is supplied to the end face grinding stone (end face grinding device) to recover the processing ability of the grinding wheel.

This is because the feeding speed is made slower than that of the normal product processing of the glass substrate to increase the amount of grinding to remove chips (grinding chips) attached to the surface of the groove of the grinding wheel, It is considered that an effect of removing part of the ash and bringing the abrasive grain into the surface of the groove of the grinding stone can be obtained.

Here, the feed speed of the glass substrate is a relative speed between the glass substrate and the grinding mechanism. For example, in an end surface grinding apparatus in which the grinding mechanism 13 is fixed and the glass substrate is transported as shown in Figs. 1A and 1B, Means the conveying speed of the glass substrate (work). When the glass substrate is fixed and the grinding mechanism 13 is moved, it means the moving speed of the grinding mechanism 13, and when both the glass substrate and the grinding mechanism 13 are to be transported and moved, Relative speed.

The amount of grinding (machining amount) means the size (width) of the grinding stone (workpiece margin) at the time of grinding the end face of the glass substrate.

The conditions of the grinding processing at the time of manufacturing a normal product are determined by the characteristics of the end surface grinding apparatus, the shape of the glass substrate, the surface roughness required for the product of the glass substrate, the kind of the grinding wheel do. For this reason, the conditions of the grinding processing on the end face of the glass substrate at the time of manufacturing a normal product are not limited. For example, the glass substrate may be fed at a feed rate of 6000 to 24000 mm / min and a grinding amount of 80 to 240 탆 .

The dressing method of the present embodiment may be any method of supplying a glass substrate as a dressing material to an end face grinding stone so as to be slower than the feeding speed of the glass substrate for grinding processing at the time of manufacturing the product, Other conditions are not limited.

The conveying speed of the glass substrate used as the dressing material can be set to one sixth or more of the conveying speed of the glass substrate at the time of grinding processing the end face at the time of manufacturing the product. The feed rate of the glass substrate used as the dressing material is set to 1/6 or more of the feed rate of the glass substrate at the time of manufacturing the product so that the decrease in the operating rate of the end face grinding apparatus of the glass substrate can be suppressed, have. The feeding speed of the glass substrate used as the dressing material can be set to 1/3 or less of the feeding speed of the glass substrate at the time of grinding the end face at the time of manufacturing the product. A sufficient dressing effect can be obtained by setting the conveying speed of the glass substrate used as the dressing material to 1/3 or less of the conveying speed of the glass substrate at the time of manufacturing the product.

The grinding amount of the glass substrate used as the dressing material may be 1.1 times or more the grinding amount of the glass substrate at the time of grinding the end face at the time of manufacturing the product. A sufficient dressing effect can be obtained by setting the grinding amount of the glass substrate used as the dressing material to be equal to or larger than 1.1 times the grinding amount of the glass substrate at the time of manufacturing the product. The grinding amount of the glass substrate used as the dressing material may be 3.5 times or less the grinding amount of the glass substrate at the time of grinding the end face at the time of manufacturing the product. It is possible to prevent the glass substrate from being broken during the grinding processing by setting the grinding amount of the glass substrate used as the dressing material to 3.5 times or less the grinding amount of the glass substrate at the time of manufacturing the product.

The glass substrate used as the dressing material is not particularly limited, and various glass substrates can be used. For example, a glass substrate may be prepared for dressing only and used for dressing. In addition, a glass substrate used in the production of ordinary products may be used.

When preparing a dedicated glass substrate for dressing, the size thereof is not particularly limited, and it may be a size enough to secure a sufficient amount of grinding. However, it is preferable that the size is the same as that of a glass substrate of a normal product so that the configuration and arrangement of the end surface grinding apparatus need not be changed. In particular, it is preferable to use a glass substrate having the same thickness as the glass substrate of the product so as to be able to cope with the surface shape of the groove of the grinding wheel. The material is not particularly limited, but it is preferable to use a glass substrate of the same material as the glass substrate for the product.

The glass substrate to be used as a dressing material may be either a glass substrate on which a grinding process has been performed on an end face in advance or a glass substrate on which a grinding process has been previously performed.

As shown in Examples 1 and 2 to be described later, the glass substrate used as the dressing material is a glass substrate which does not deform the surface shape of the groove of the grinding wheel without the grinding processing (chamfering) of the end face portion, Is obtained.

Particularly, in the case of using a glass substrate which is not subjected to the grinding processing in advance on the end surface portion, since the step of machining the glass substrate in advance can be omitted, the working efficiency can be increased and it is preferable from the viewpoint of cost.

In this case, for example, it is possible to change the operating condition of the end face grinding apparatus of the glass substrate in which the normal operation is carried out (the grinding amount is increased by slowing the feeding speed) Can be performed. After completion of the dressing, the glass substrate can be returned to the normal operating condition and the grinding processing of the glass substrate end face can be performed. This is preferable because it is possible to particularly suppress a reduction in the operating rate of the end surface grinding apparatus of the glass substrate.

It is also preferable that a glass substrate used as a dressing material is also used as a product (usable). For example, when a glass substrate used for manufacturing a product is used as a dressing material, if the amount of grinding increased during dressing is within the tolerance of the product, the product can be used as it is. In this case, since it is not necessary to dispose or reprocess the glass substrate used for dressing, it is preferable in terms of reducing the load on the cost and the environment.

When dressing is performed, it is not necessary to perform only one glass substrate. For example, in the case where the effect of dressing is not sufficient with only one glass substrate or when the grinding amount can not be sufficiently secured due to the convenience of the processing precision (tolerance) required for the product, The glass substrate may be used for dressing.

The timing at which the dressing method of the present embodiment is performed is not particularly limited and may be arbitrarily set. For example, it is also possible to perform dressing regularly based on the accumulated grinding amount of the grinding wheel for end face grinding (groove of grinding wheel), or to perform the inspection on the grinding-finished product, and to perform it at an arbitrary timing based on the inspection result Do.

An example of a control flow of a specific dressing is shown in Fig. This is based on the accumulated grinding amount of the grinding wheel for end face grinding and furthermore, the dressing is performed at an arbitrary timing.

First, the grinding wheel for grinding the end face is set on the end face grinding apparatus 10 on the end face of the glass substrate, and the operation is started under the conditions for manufacturing the product. Here, the grinding cumulative grinding amount A for counting the accumulated grinding amount (machining amount) of the grinding wheel for end face grinding is reset to 0 (step S10). Further, the dressing-interval grinding-cumulative grinding amount B, which is the cumulative grinding amount (machining amount) after the dressing is last performed, is reset to zero (step S12).

Thereafter, the end face of the glass substrate is ground (step S14). This step is a step of grinding the end face of the glass substrate at the time of manufacturing the product. The glass substrate is fed to the end face grinding stone at a first feeding speed and the end face of the glass substrate is ground with the first grinding amount. Accordingly, the values of the grinding cumulative amount A of the grinding wheel and the cumulative grinding amount B of the dressing-interval grinding wheel are counted up according to the grinding amount (step S16).

Then, the following judgment is made at a predetermined timing (for example, each time one grinding process is performed on the glass substrate end face) while the grinding process is performed on the end face of the glass substrate.

First, it is determined whether or not the grinding cumulative amount A of the grinding wheel has reached the set value A1 (step S18). Here, the setting value A1 defines the accumulated grinding amount of the end face grinding stone until the grinding wheel for end face grinding is installed in the end face grinding apparatus and then requires replacement. For example, And the type of the glass substrate that is the object to be ground, and the like. That is, since the set value A1 is defined as a limit value at which the end face grinding wheel can be used, when it is determined that the set value A1 has been reached, it is necessary to replace the end face grinding wheel. Therefore, when it is determined that the set value A1 has been reached (YES in step S18), the operation is stopped (step S34) and the end face grinding wheel is exchanged. If it is determined that the set value A1 has not been reached (NO in step S18), the process proceeds to the next determination.

Then, it is judged whether or not any glass dressing start button which is arbitrarily pressed is judged not to be pressed (step S20) when it is judged that sufficient edge grinding has not been performed as a result of inspection of the end face of the glass substrate thus produced.

When the arbitrary glass dressing start button is pressed (YES in step S20), a dressing process (step S24) to be described later is performed. If it is judged that it is not pressed (NO in step S20), the process proceeds to the next judgment.

Then, it is determined whether or not the dressing-interval grinding cumulative grinding amount B has reached the set value B1 (step S22). Here, the set value B1 is defined as the accumulated grinding amount of the grinding wheel for end face grinding after the dressing and before the next dressing. Similar to the case of the set value A1, the set value B1 is specified in advance on the basis of, for example, the configuration of the end face grinding apparatus, the grinding wheel for end face grinding, the type of glass substrate to be ground, and the like.

If it is determined that the set value B1 has not been reached ("NO" in step S22), the grinding processing on the glass substrate end face is repeated.

When it is determined that the set value B1 has been reached (YES in step S22), the set value B1 related as described above is set to the value B1 of the grinding wheel Since the cumulative grinding amount is determined, dressing is automatically performed (step S24).

The dressing changes the feeding speed (grinding speed of the grinding wheel) of the glass substrate to the feeding speed for dressing as described above, and changes the position of the grinding mechanism so that the grinding amount becomes the condition when the dressing is performed (step S26). Thereafter, the glass substrate is used as a dressing material to perform dressing (step S28). This step is a step of dressing the end face grinding stone by using the end face of the glass substrate as the dressing material of the end face grinding stone. Here, the glass substrate is sent to the end face grinding stone at a second feed rate that is later than the first feed rate. Further, the end face of the glass substrate is ground to a second grinding amount larger than the first grinding amount. Specifically, the grinding mechanism 13 is controlled so that the distance between the end face of the glass substrate used as the dressing material and the end face grinding stone becomes close to each other.

After the step of dressing the grinding wheel for end face grinding is performed for a predetermined time, the feed rate and the grinding amount are returned to the normal operation conditions, that is, the set values at the time of the original grinding processing (conditions at the time of manufacturing the product) S32). Then, the dressing-interval grinding cumulative grinding amount B is reset to 0 (step S12), and the grinding processing on the glass substrate end face is performed again.

By performing the grinding processing on the end face of the glass substrate by repeating the above-mentioned flow chart, it is possible to perform the grinding processing on the end face of the glass substrate while the dressing is performed at a predetermined timing without stopping the end face grinding apparatus on the end face of the glass substrate have.

The determination in steps S14 to S22 may be made every time a predetermined number (one or more) of glass substrates is processed.

Next, the configuration of the controller 100 will be described. Fig. 5 is a block diagram functionally showing the configuration of the controller 100. As shown in Fig. The controller 100 includes a control unit 102 and a setting condition storage unit 104. [

The setting condition storage unit 104 stores the setting values A1 and B1 and the feed rate and the grinding amount of the glass substrate in the normal operation condition (A position of the grinding mechanism 13), a predetermined timing for making the determination in steps S18 to S22 in Fig. 3, a predetermined execution time for performing the glass dressing, and the like And the like. These conditions can be set in plural according to the kind of the glass substrate and the required characteristics of the product.

As described with reference to Fig. 1B, when a plurality of grinding mechanisms 13 are arranged in the carrying direction by changing the type and roughness of the grinding wheel, such as coarse grinding or finishing, for example, Conditions can be set. The setting condition storage unit 104 stores these conditions.

The predetermined execution time for performing the glass dressing can be set, for example, in accordance with the feeding speed of the glass substrate and the amount of grinding at the time of glass dressing. For example, as described above, when the amount of grinding at the time of dressing is made similar to that at the time of normal operation, the predetermined execution time for performing the glass dressing can be set to be long. Further, the distance for performing the glass dressing or the number of glass substrates to be subjected to the glass dressing may be set in place of the predetermined execution time for performing the glass dressing.

The control unit 102 refers to the conditions set in the setting condition storage unit 104 and controls each procedure in the flowchart shown in Fig. The control section 102 also controls the transport mechanism 12 and the grinding mechanism 13 based on the conditions set in the setting condition storage section 104 so that normal operation conditions and glass dressing are performed.

When the above-described arbitrary glass dressing start button is pressed, for example, the flag indicating the fact is turned on, and the control unit 102 refers to the flag to make the judgment in step S20 of Fig. 3 .

The controller 100 can be constituted by a computer having a central processing unit (CPU) for performing various controls, an input / output device, a storage device, and the like, and has an execution program for executing the above- .

When the dressing method of the edge grinding stone of the glass substrate described above is used in the manufacturing process of the glass substrate, that is, in the case of the manufacturing method of the glass substrate using the dressing method, the manufacturing apparatus of the glass substrate is not stopped, The dressing of the grinding wheel can be performed. As a result, the productivity can be improved compared to the conventional art, and the dressing can be performed easily because the operator does not have to perform the operation manually.

Further, as in the prior art, there is no deviation in the state of the surface of the groove of the grinding wheel after dressing by the operator, so that the grinding ability of the grinding wheel can be restored stably and the deformation of the surface shape of the groove formed in the grinding stone can be prevented have. This makes it possible to continuously produce glass substrates of more stable quality.

Example

Hereinafter, the present invention will be described by way of specific examples, but the present invention is not limited to these examples.

[Example 1]

In the present embodiment, in the end face grinding apparatus for a glass substrate having the same structure as that shown in Figs. 1A and 1B, the end face of the glass substrate is subjected to a grinding process, and the end face grinding stone, Respectively. As the grinding wheel for end face grinding, a cylindrical grinding wheel having a diameter of 150φ was used and eight identical grinding grooves were formed on the side face thereof. As shown in Table 1, the eight grooves formed on the side faces of the grinding wheel for end face grinding were in the same state in which the cumulative machining (grinding) distance was about 1500 m, and dressing was performed for each groove and evaluation thereof was carried out. Eight grooves correspond to Examples 1-1 to 1-8 in Table 1.

The dressing was carried out by using a glass substrate (non-alkali glass, product name: AN100, manufactured by Asahi Glass Co., Ltd.) having the same material and the same size as those used for ordinary products as a dressing material one by one for each groove . Specifically, the size is 1850 mm × 1500 mm × 0.7 mm thick. In this embodiment, a glass substrate on which end surface grinding is not performed in advance is used.

Normally, when grinding the end face of the glass substrate for a product, the end face grinding apparatus of the glass substrate is carried out under conditions of a conveying speed of 6000 mm / min and a grinding amount of 150 탆, The dressing was performed by varying the feed rate and the grinding amount for each groove as shown in Examples 1-8.

For evaluation, evaluation was conducted by observing and comparing the groove surface of the grinding wheel with a microscope (trade name: VHX-100F, manufactured by Kabushiki Kaisha Kensuke Co., Ltd.) before and after the dressing. The results are shown in Table 1.

In Table 1, the circle showing the effect of the dressing was double-circled for those recovered to the state of the groove surface before the start of use (about the same as the shipment).

According to this, it was confirmed that the dressing effect can be obtained by slowing the feed rate of the glass substrate for any sample (groove) and increasing the amount of grinding. Particularly, Example 1-4 in which the feed speed is 1000 mm / min and the grinding amount is 500 탆, and Example 1-8 in which the feed rate is 2000 mm / min and the grinding amount is 400 탆 are recovered to the same level as before the start of use of the grindstone I could confirm.

In all cases, it was confirmed that the surface shape of the groove formed on the side surface of the grinding wheel was not greatly changed before and after the dressing, and the dressing was appropriately performed.

[Example 2]

In this embodiment, experiments were conducted by varying the feed rate and the amount of grinding per groove in the same manner as in Example 1 except that a glass substrate on which an end face grinding process was previously performed was used as a glass substrate used for dressing.

Herein, the glass substrate on which the end surface grinding process has been performed in advance is a glass substrate obtained by grinding an end face of the glass substrate by using the same end face grinding apparatus of the same glass substrate once under normal product conditions It means.

Also in this embodiment, as in the case of the first embodiment, a cylindrical grinding wheel of 150phi is used as the grinding wheel for end face grinding, and a diamond grinding wheel having eight identical grooves formed on its side face is used. As shown in Table 2, the eight grooves formed on the side faces of the grinding wheel for end face grinding were in the same state in which the cumulative machining (grinding) distance was about 1500 m, and dressing was performed for each groove and evaluation thereof was carried out. Eight grooves correspond to Examples 2-1 to 2-8 in Table 2.

As for the evaluation, the groove surfaces of the grindstone were observed and compared using a microscope (trade name: VHX-100F, manufactured by Kabushiki Kaisha Kensuke Co., Ltd.) before and after the dressing. The results are shown in Table 2.

Also in Table 2, a double circle was attached to the case where the state of the groove surface of the grinding wheel was recovered before the start of use (to the same degree as when the grinding stone was shipped) with respect to the dressing effect.

According to this, it was confirmed that the dressing effect can be obtained by slowing the feed rate of the glass substrate for any sample (groove) and increasing the amount of grinding. Particularly, Example 2-4 in which the feed rate is 1000 mm / min and the grinding amount is 500 탆 and Example 2-8 in which the feed rate is 2000 mm / min and the grinding amount is 400 탆 are recovered to the same level as before the start of use of the grindstone I could confirm.

Also in all cases, it was confirmed that the surface shape of the groove was not greatly changed before and after the dressing, and dressing was appropriately performed.

Comparing the results of Examples 1 and 2 shows that the dressing effect can be obtained in the same manner regardless of whether the grinding processing is performed on the glass substrate end face in advance or not, Can be obtained.

[Example 3]

In the present embodiment, in the end surface grinding apparatus for a glass substrate having the same structure as that shown in Figs. 1A and 1B, the dressing was performed by changing the kind of the glass substrate in Examples 1 and 2.

The dressing was carried out using a glass substrate (soda lime glass, product name: PD200, manufactured by Asahi Glass Co., Ltd.) having the same material and the same size as those used in ordinary product manufacturing as a dressing material. The size of the glass substrate was 2250 mm in width x 1900 mm in length x 1.8 mm in thickness, and a glass substrate on which edge grinding was not performed was used.

As shown in Examples 3-1 and 3-2 in Table 3, the diamond grinding wheel for end face grinding was dressed with two types of diamond grindstones having different surface roughnesses. The shapes of the end face grinding grindstones were all 204 탆 in the shape of a cylinder, and grooves were formed on the side faces of the grinding wheel. In Example 3-1, the cumulative machining distance was 16000 m, whereas in Example 3-2, the dressing was performed because the cumulative machining distance was 6000 m. In addition, the cumulative machining distance after completion of dressing at the end of Example 3-1 and Example 3-2 is 1000 m.

In Examples 3-1 and 3-2, the grinding processing of the end face of the glass substrate was carried out under the condition that the glass substrate was transported at a speed of 20000 mm / min and a grinding amount of 160 탆, , The glass substrate was transported at a speed of 4000 mm / min and a grinding amount of 500 탆.

For the evaluation, the surface roughness, the amount of protrusion, and the amount of wear were measured before the start of use (state when the wheelbarrow was shipped) and the groove portion of the end face grinding stone after dressing. The surface roughness was measured using a surface roughness meter (trade name: Surfcom 1400A-12, manufactured by Tokyo Seimitsu Co., Ltd.). Further, the surface of the groove was enlarged 100 times by using a microscope (trade name: VHX-100F, manufactured by KYOSEN CO., LTD.), And the surface was observed.

Table 3 shows the measurement results of the surface roughness, the amount of protrusion, and the amount of wear.

Figs. 4A to 4D show surface images of the grooves of the grinding wheel for end face grinding before use and after dressing. Fig.

Figs. 4A and 4B are surface images of groove portions of the end face grinding stone of Example 3-1, Fig. 4A is a surface image after dressing, and Fig. 4B is a surface image before use.

4C and 4D are surface images of groove portions of the end face grinding stone of Example 3-2, and Fig. 4C is a surface image after dressing, and Fig. 4D is a surface image before use.

According to the surface image, it was confirmed that even in the case of any wheel, the state of the groove surface was restored to the state of the groove surface approximately equal to that before the start of use after the dressing.

It can be confirmed from Table 3 that the surface roughness Ra, the amount of protrusion and the amount of wear, and the measurement result of the groove surface of the grinding wheel after dressing were recovered to approximately the same level as before the start of use.

From the results of the above examples, it was confirmed that the dressing of the end face grinding stone can be performed by the dressing method of the present embodiment regardless of the type and size of the glass substrate and the grinding wheel.

A dressing method of a grinding wheel for grinding an end face of a glass substrate according to the present embodiment uses a glass substrate as a dressing material and makes the feeding speed slower than that during production of a product to reduce the amount of grinding (processing amount) The glass substrate is supplied to the side grinding apparatus to perform dressing. As a result, the dressing can be performed without stopping the end face grinding apparatus. Thus, the productivity can be improved compared with the conventional art, and the dressing can be performed easily because the worker does not need to perform it manually.

As in the conventional dressing method, there is no deviation in the state of the surface of the groove of the grinding wheel after dressing by the operator, so that the grinding ability of the grinding wheel can be restored stably and the deformation of the surface shape of the groove formed in the grinding stone .

In addition, in the conventional case, if the surface shape of the groove formed on the grinding wheel is defective, it is necessary to stop the end face grinding apparatus and replace the grinding stone when it is determined after the grinding apparatus is installed. However, even in such a case, the dressing method of the present embodiment can eliminate the defects of the surface shape of the grooves without stopping the end surface grinding apparatus, and also the productivity can be improved compared with the conventional method.

Although the preferred embodiments and examples of the present invention have been described in detail, it is to be understood that the present invention is not limited to the specific embodiments and examples described above, It is possible to modify or change it.

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-005649, filed on January 13, 2012, the entire contents of which are incorporated herein by reference.

Claims (8)

A method of dressing a grinding wheel for grinding an end face of a glass substrate,
Using a glass substrate as a dressing material,
The conveyance speed of the glass substrate used as the dressing material is made slower than the conveyance speed of the glass substrate at the time of grinding the end face at the time of manufacturing the product,
The grinding amount of the glass substrate to be used as a dressing material becomes larger than the grinding amount of the glass substrate at the time of grinding processing the end face at the time of manufacturing the product,
Wherein the glass substrate for use as a dressing material is supplied to the end face grinding grindstone. The method of manufacturing a glass substrate according to claim 1, wherein the feeding speed of the glass substrate used as a dressing material is 1/6 to 1/3 or less of the feeding speed of the glass substrate at the time of grinding the end face at the time of manufacturing the product,
Characterized in that the grinding amount of the glass substrate used as a dressing material is 1.1 times or more and 3.5 times or less of the grinding amount of the glass substrate at the time of grinding the end face in the production of the product Dressing method. The glass substrate for use as a dressing material according to any one of claims 1 to 2,
Wherein the glass substrate is a glass substrate not subjected to grinding processing in advance on an end face thereof. The method for dressing a grinding wheel for grinding an end face of a glass substrate according to any one of claims 1 to 3, wherein the glass substrate used as a dressing material is used as a product. A normal step of grinding the end face of the glass substrate at the first grinding amount while sending the glass substrate to the end face grinding grindstone at the first feeding speed during product manufacture,
Determining whether or not dressing of the end face grinding wheel is necessary at a predetermined timing,
And when it is determined that the dressing is necessary, the glass substrate is sent to the end face grinding stone at a second feeding speed that is slower than the first feeding speed, and the second grinding amount is larger than the first grinding amount A dressing process for grinding the end face of the substrate
≪ / RTI > 6. The method of manufacturing a glass substrate according to claim 5, wherein the normal process is performed again after the dressing process is performed for a predetermined time. 7. The method according to any one of claims 5 to 6, wherein a plurality of glass substrates are continuously sent to the end face grinding stone,
Wherein the step of determining is performed every time the normal process is performed on a predetermined number of the glass substrates. The method according to any one of claims 5 to 7, wherein in the determining step, when the cumulative grinding amount of the glass substrate after the last dressing step is equal to or larger than a set value, And judging that dressing is necessary.

Images