Manufacturing method for board materials

Abstract

To provide a method of manufacturing a plate-like article, obtained by cutting a plate material with a rotary blade, the method making it possible to improve quality of an end edge.SOLUTION: In a method of manufacturing a plate-like article, the plate-like article made of a plate material having four sides is manufactured. The method of manufacturing the plate-like article comprises a cutting process of using a rotary blade with one principal surface of the plate material between both principal surfaces supported with its own weight to cut the plate material. The cutting process includes first and second cutting process. In the first cutting process, the plate material is cut along a preliminary cutting line outside a predetermined cutting line SL1 for forming one side of the plate-like article so as to obtain a semi-finished product plate material 13 from the plate material. In the second cutting process, the semi-finished product plate material 13 is cut along the predetermined cutting line SL1 to be divided into a product plate material and an unnecessary plate material 16. In a direction orthogonal to the predetermined cutting line SL1, the unnecessary plate material 16 has a smaller plane size than that of the product plate material.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a plate material.

Background Art

[0002] Conventionally, a plate-like article having a predetermined dimension has been manufactured by cutting a plate material using a rotary blade, for example, as disclosed in Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described above, when cutting a plate material made of an inorganic material such as glass, ceramics, or stone using a rotary blade, cracks generated on the cut surface may progress due to the residual stress of the plate material. In particular, when the plate material is lead glass having a large thickness dimension, the progress of cracks becomes remarkable. Such progress of cracks can result in defects at the edges of the plate-like article obtained from the plate material.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a method for manufacturing a plate-like article that enables improvement in the quality of the edges of the plate-like article obtained by cutting a plate material using a rotary blade.

Means for Solving the Problems

[0006] A method for manufacturing a plate-shaped article that solves the above problems is a method for manufacturing a plate-shaped article from a plate material having four sides, comprising a cutting step of cutting the plate material using a rotating blade while one of the two main surfaces of the plate material is supported only by its own weight, wherein the cutting step includes a first cutting step of obtaining a semi-finished plate material from the plate material by cutting the plate material along a preliminary cutting line which is outside the planned cutting line for forming one side of the plate-shaped article, and a second cutting step of dividing the semi-finished plate material into a product plate material and a waste plate material by cutting the semi-finished plate material along the planned cutting line, wherein the planar dimensions of the waste plate material are smaller than the planar dimensions of the product plate material in a direction perpendicular to the planned cutting line.

[0007] In the first cutting step described above, if the sheet metal is cut along the pre-cutting line, cracks may propagate from the cut surface. However, since the pre-cutting line is located outside the planned cutting line, it is possible to prevent the cracks from reaching the planned cutting line. Furthermore, by cutting the sheet metal along the pre-cutting line, the residual stress at the periphery of the cut surface of the semi-finished sheet metal is reduced. Therefore, in the second cutting step, even if the rotary blade is advanced along the planned cutting line, it is possible to suppress the propagation of cracks toward the finished sheet metal. Even if cracks do propagate, since the planar dimensions of the waste sheet metal are smaller than those of the finished sheet metal, when the semi-finished sheet metal is supported only by its own weight and the rotary blade is advanced along the planned cutting line in the second cutting step, the waste sheet metal side is more prone to vibration than the finished sheet metal side. As a result, in the second cutting step, it is possible to reduce the residual stress of the semi-finished sheet metal on the waste sheet metal side more preferentially than on the finished sheet metal side. In other words, cracks generated during the second cutting process as the rotary blade cuts tend to propagate more towards the waste material side than towards the product material side. This makes it possible to suppress the propagation of cracks towards the product material side.

[0008] In the above method for manufacturing the sheet material, the planar dimensions of the waste sheet material may be 1 / 2 or less of the planar dimensions of the product sheet material. According to this method, when the rotating blade is advanced along the planned cutting line of the semi-finished sheet material in the second cutting step, vibration of the waste sheet material side can be promoted more than that of the product sheet material side. This makes it possible to further suppress the propagation of cracks toward the product sheet material side.

[0009] In the above method for manufacturing sheet material, the planar dimensions of the waste sheet material may be within the range of 5 mm or more and 50 mm or less. When the planar dimensions of the waste sheet material are 5 mm or more, it is easier to avoid cracks generated in the first cutting step from propagating to the finished sheet material. When the planar dimensions of the waste sheet material are 50 mm or less, in the second cutting step, when the rotating blade is advanced along the planned cutting line of the semi-finished sheet material, vibration of the waste sheet material side can be promoted more than that of the finished sheet material side. This makes it possible to further suppress the propagation of cracks to the finished sheet material side. In addition, when the planar dimensions of the waste sheet material are 50 mm or less, the amount of waste sheet material discharged can be reduced, which makes it possible to improve the yield of sheet-shaped articles, for example.

[0010] In the above method for manufacturing the plate material, the plate material may be plate glass. Even when using plate glass, which is prone to crack propagation due to residual stress, it is possible to suppress the propagation of cracks in the plate-shaped article.

[0011] In the above method for manufacturing the plate material, the plate glass may be glass containing 20% ​​by mass or more of PbO. Even with glass containing a large amount of PbO, which is prone to crack propagation due to residual stress, it is possible to suppress the propagation of cracks in the plate-shaped article.

[0012] In the above method for manufacturing the plate material, the thickness dimension of the glass plate may be 6 mm or more. As the thickness dimension of the glass plate increases, residual stress is more likely to occur in the glass plate, and cracks tend to propagate when obtaining a plate-shaped article from such glass plate. The above method for manufacturing the plate-shaped article makes it possible to effectively suppress crack propagation even when obtaining a plate-shaped article from glass plate with a thickness dimension of 6 mm or more.

[0013] A method for manufacturing a plate material that solves the above problem is a method for manufacturing a plurality of plate-shaped articles from a plate material having four sides, wherein the plate material has a first cutting line for forming one side of a first plate-shaped article, a second cutting line for forming one side of a second plate-shaped article, and an unnecessary portion provided between the first cutting line and the second cutting line, and the manufacturing method comprises a cutting step of cutting the plate material using a rotating blade while supporting one of the two main surfaces of the plate material by its own weight, and the cutting step of cutting the plate material along a preliminary cutting line that separates the unnecessary portion of the plate material to the side of the first cutting line and the side of the second cutting line, The cutting process includes: a first cutting step of dividing a sheet material into a first semi-finished sheet material and a second semi-finished sheet material; a second cutting step of dividing the first semi-finished sheet material into a first product sheet material and a first waste sheet material by cutting the first semi-finished sheet material along a first cutting line, and dividing the second semi-finished sheet material into a second product sheet material and a second waste sheet material by cutting the second semi-finished sheet material along a second cutting line, wherein in a direction perpendicular to the first cutting line, the planar dimensions of the first waste sheet material are smaller than the planar dimensions of the first product sheet material, and in a direction perpendicular to the second cutting line, the planar dimensions of the second waste sheet material are smaller than the planar dimensions of the second product sheet material.

[0014] In the first cutting step of the method for manufacturing plate-shaped articles, if the plate material is cut along a pre-cutting line, cracks may propagate from the cut surface. However, since the pre-cutting line is located between the first and second planned cutting lines, it is possible to prevent the cracks from reaching the first and second planned cutting lines. Furthermore, by cutting the plate material along the pre-cutting line, the residual stress at the periphery of the cut surface is reduced. Therefore, in the first and second cutting steps, even if cutting is performed along the first and second planned cutting lines, it is possible to suppress the propagation of cracks toward the first and second product plate material sides. In addition, the planar dimensions of the first waste plate material are smaller than those of the first product plate material, and the planar dimensions of the second waste plate material are smaller than those of the second product plate material. Therefore, even if cracks propagate, in the second cutting process, due to the same effect as described above, cracks generated as the cutting progresses by the rotary blade along the first planned cutting line tend to propagate more toward the first discarded sheet material than toward the first product sheet material. Also, cracks generated as the cutting progresses by the rotary blade along the second planned cutting line tend to propagate more toward the second discarded sheet material than toward the second product sheet material. This makes it possible to suppress the propagation of cracks toward both the first product sheet material and the second product sheet material. [Effects of the Invention]

[0015] According to the present invention, it is possible to improve the quality of the edges of a plate-shaped article obtained by cutting a plate material using a rotary blade. [Brief explanation of the drawing]

[0016] [Figure 1] (a) is a plan view showing a plate material in the first embodiment, and (b) is a plan view showing a plate-shaped article. [Figure 2] This is a schematic cross-sectional view illustrating the cutting process. [Figure 3] This is a schematic plan view illustrating the first cutting process. [Figure 4] This is a schematic plan view illustrating the second cutting process. [Figure 5]It is a schematic plan view for explaining the third cutting process. [Figure 6] It is a schematic plan view for explaining the state after the cutting process. [Figure 7] It is a schematic plan view for explaining the first cutting process in the second embodiment. [Figure 8] It is a plan view showing a plate-like article. [Figure 9] It is a schematic plan view for explaining the second cutting process and the third cutting process.

Embodiments for Carrying Out the Invention

[0017] (First Embodiment) Hereinafter, a first embodiment of a method for manufacturing a plate-like article will be described with reference to the drawings. In the drawings, for convenience of explanation, a part of the configuration may be exaggeratedly shown. Also, the dimensional ratios of each part may be different from the actual ones.

[0018] As shown in FIGS. 1(a) and 1(b), the method for manufacturing a plate-like article manufactures a plate-like article 12 from a plate material 11 having four sides. As shown in FIG. 2, the method for manufacturing the plate-like article 12 includes a cutting process of cutting the plate material 11 using a rotary blade RB. The rotary blade RB has a cutting edge that cuts the plate material 11 in the thickness direction. The cutting process is performed in a state where only the self-weight supports the first main surface 11a of the plate material 11 among the first main surface 11a and the second main surface 11b on the opposite side of the first main surface 11a. More specifically, the plate material 11 is placed on the placement surface T of the surface plate SP in a posture with the first main surface 11a as the lower surface and the second main surface 11b as the upper surface so as to be substantially horizontal. The placement surface T is composed of, for example, a rubber material and a resin material. The placement surface T may have a groove into which the cutting edge of the disk-shaped rotary blade RB enters, or may be a flat surface that is cut as the cutting by the rotary blade RB progresses.

[0019] In Figure 2, the rotation direction of the rotating blade RB, indicated by the arrow, is preferably from the second main surface 11b, which is the upper surface of the plate material 11, toward the first main surface 11a, which is the lower surface of the plate material 11. In other words, it is preferable that the cutting of the plate material 11 using the cutting blade is a so-called down cut.

[0020] As shown in Figure 1(a), the plate material 11 has a first cutting line SL1 and a preliminary cutting line PL1 that is located outside the first cutting line SL1 pre-set. In addition, the plate material 11 of this embodiment has a second cutting line SL2 pre-set at a position opposite to the preliminary cutting line PL1 relative to the first cutting line SL1.

[0021] The first planned cutting line SL1 corresponds to the first side S1 of the plate-shaped article 12 shown in Figure 1(b). The preliminary cutting line PL1 is set to provide an excess portion outside the first side S1 of the plate-shaped article 12. The second planned cutting line SL2 corresponds to the second side S2 of the plate-shaped article 12 shown in Figure 1(b).

[0022] The cutting step of the manufacturing method for the plate-shaped article 12 includes a first cutting step and a second cutting step. In the first cutting step of the manufacturing method for the plate-shaped article 12, the plate material 11 is cut along the preliminary cutting line PL1, as shown by the arrow CP in Figure 3. This first cutting step yields a semi-finished plate material 13 from the plate material 11, as shown in Figures 3 and 4. More specifically, the plate material 11 is divided into a semi-finished plate material 13 and a remaining plate material 14. The remaining plate material 14, which remains after obtaining the semi-finished plate material 13 from the plate material 11, can be used, for example, to manufacture plate-shaped articles with smaller external dimensions.

[0023] In the second cutting step of the manufacturing method for the plate-shaped article 12, the semi-finished plate material 13 is cut along the first planned cutting line SL1, as shown by the arrow CP in Figure 4. This second cutting step divides the semi-finished plate material 13 into product plate material 15 and waste plate material 16, as shown in Figures 4 and 5.

[0024] As shown in Figure 5, in the direction perpendicular to the first planned cutting line SL1, the planar dimension D1 of the waste material 16 is smaller than the planar dimension D2 of the product material 15. Preferably, the planar dimension D1 of the waste material 16 is 1 / 2 or less of the planar dimension D2 of the product material 15. Preferably, the planar dimension D1 of the waste material 16 is within the range of 5 mm or more and 50 mm or less.

[0025] The manufacturing method for the plate-shaped article 12 of this embodiment includes a third cutting step in which the product plate material 15 obtained in the second cutting step is further cut. In the third cutting step, the product sheet material 15 is cut along the second planned cutting line SL2, as shown by the arrow CP in Figure 5. This third cutting step divides the product sheet material 15 into a plate-shaped article 12 and scrap material 17, as shown in Figures 5 and 6.

[0026] As shown in Figure 6, in the direction perpendicular to the second planned cutting line SL2, the planar dimension D3 of the scrap material 17 is smaller than the planar dimension D4 of the plate-shaped article 12. Preferably, the planar dimension D3 of the scrap material 17 is 1 / 2 or less of the planar dimension D4 of the plate-shaped article 12. Preferably, the planar dimension D3 of the scrap material 17 is within the range of 5 mm or more and 50 mm or less.

[0027] A diamond wheel is preferred as the rotating blade RB used in the manufacturing method of the plate-shaped article 12 described above. A diamond wheel is made by bonding abrasive grains, including diamond abrasive grains, to the outer peripheral end (cutting edge) of the wheel using a binder. Examples of abrasive grains other than diamond abrasive grains include black silicon carbide and green silicon carbide. Examples of binders include resin bonds using thermosetting resins containing phenolic resin, and metal bonds using metal powders such as copper, tin, iron, and cobalt. The rotating blade RB is provided in a well-known cutting machine (not shown). This cutting machine includes, for example, a rotation drive unit for rotating the rotating blade RB, a position adjustment mechanism for the rotating blade RB, a travel drive unit for moving the rotating blade RB, and a control unit for controlling the operation of the rotating blade RB.

[0028] Next, the plate material 11 and the plate-shaped article 12 will be described. Examples of brittle plate materials 11 include plate glass, ceramic plates such as metal oxides, and metal plates such as silicon. The method for manufacturing the plate-shaped article 12 of this embodiment can be suitably used to manufacture the plate-shaped article 12 from plate glass. The thickness of the plate glass may be, for example, 6 mm or more, or 9 mm or more. Examples of plate glass with a relatively large thickness include radiation shielding glass. Radiation shielding glass is used, for example, as a window material to shield from radiation (e.g., X-rays) irradiated from X-ray machines used in medical institutions. Examples of radiation shielding glass include radiation shielding glass containing lead, and radiation shielding glass that does not contain lead but contains other radioactive shielding materials. A glass plate containing lead may, for example, be glass containing 20% ​​by mass or more of PbO.

[0029] Next, the main process for manufacturing the plate-shaped article 12 will be explained. In the first cutting step of the manufacturing method for the plate-shaped article 12, as shown in Figure 3, when the plate material 11 is cut along the preliminary cutting line PL1, cracks CR may propagate from the cut surface towards the remaining plate material 14 and the semi-finished plate material 13, as shown in Figure 4. In the drawings, the propagated cracks CR are exaggerated with black-filled triangles. At this time, since the preliminary cutting line PL1 is located outside the first planned cutting line SL1, it is possible to prevent the cracks CR from reaching the first planned cutting line SL1.

[0030] Furthermore, by cutting the sheet metal along the preliminary cutting line PL1, the residual stress at the periphery of the cut surface of the semi-finished sheet metal 13 is reduced. Therefore, even if cutting is carried out with the rotary blade RB along the first planned cutting line SL1 in the second cutting process, it is possible to prevent crack propagation toward the finished sheet metal 15.

[0031] Furthermore, even if cracks propagate, the planar dimension D1 of the waste material 16 is smaller than the planar dimension D2 of the product material 15. Therefore, as shown in Figure 4, when cutting is carried out by the rotary blade RB along the first planned cutting line SL1 with the semi-finished product material 13 supported only by its own weight during the second cutting process, the waste material 16 side vibrates more easily than the product material 15 side. As a result, in the second cutting process, it is possible to reduce the residual stress of the semi-finished product material 13 preferentially on the waste material 16 side rather than the product material 15 side. In other words, as shown in Figure 5, the crack CR generated as cutting by the rotary blade RB progresses during the second cutting process tends to propagate more towards the waste material 16 side than towards the product material 15 side. This makes it possible to suppress the propagation of crack CR toward the product material 15 side.

[0032] Furthermore, the planar dimension D3 of the scrap material 17 is smaller than the planar dimension D4 of the plate-shaped article 12. Therefore, as shown in Figure 5, when cutting is carried out by the rotary blade RB along the second planned cutting line SL2 with the product plate material 15 supported only by its own weight during the third cutting process, the scrap material 17 side is more prone to vibration than the plate-shaped article 12 side. As a result, the propagation of cracks toward the plate-shaped article 12 side can be suppressed in the same way as the propagation of cracks CR toward the product plate material 15 side.

[0033] Next, the operation and effects of the first embodiment will be described. (1-1) The method for manufacturing the plate-shaped article 12 includes a cutting step in which the plate material 11 is cut using a rotary blade RB while the first main surface 11a of the two main surfaces 11a and 11b of the plate material 11 is supported only by its own weight. The cutting step includes a first cutting step and a second cutting step. In the first cutting step, the plate material 11 is cut along a preliminary cutting line PL1 which is outside the first planned cutting line SL1 for forming one side of the plate-shaped article 12, thereby obtaining a semi-finished plate material 13 from the plate material 11. In the second cutting step, the semi-finished plate material 13 is cut along the first planned cutting line SL1, thereby dividing the semi-finished plate material 13 into a product plate material 15 and a waste plate material 16. In a direction perpendicular to the first planned cutting line SL1, the planar dimension D1 of the waste plate material 16 is smaller than the planar dimension D2 of the product plate material 15.

[0034] According to this method, in the second cutting step, the aforementioned action makes it possible to suppress the propagation of cracks CR toward the product plate material 15. Therefore, it is possible to improve the quality of the edges of the plate-shaped article 12 obtained by cutting the plate material 11 with the rotary blade RB. This makes it possible to improve the yield of plate-shaped articles 12, for example.

[0035] (1-2) In the method for manufacturing the plate-shaped article 12, it is preferable that the planar dimension D1 of the waste plate material 16 is 1 / 2 or less of the planar dimension D2 of the product plate material 15. In this case, when the rotary blade RB is advanced along the first planned cutting line SL1 of the semi-finished plate material 13 in the second cutting step, vibration on the waste plate material 16 side can be promoted more than on the product plate material 15 side. This makes it possible to further suppress the propagation of cracks CR toward the product plate material 15 side. Therefore, when the plate material 11 is cut with the rotary blade RB to obtain the plate-shaped article 12, it is possible to further improve the quality of the edges of the plate-shaped article 12.

[0036] (1-3) In the method for manufacturing the plate-shaped article 12, it is preferable that the planar dimension D1 of the unnecessary plate material 16 is within the range of 5 mm or more and 50 mm or less. If the planar dimension D1 of the waste plate material 16 is 5 mm or more, it is easier to avoid the crack CR generated in the first cutting process from propagating to the product plate material 15. If the planar dimension D1 of the waste plate material 16 is 50 mm or less, in the second cutting process, when cutting is carried out by the rotary blade RB along the first planned cutting line SL1 of the semi-finished plate material 13, vibration on the waste plate material 16 side can be promoted more than on the product plate material 15 side. This makes it possible to further suppress the propagation of crack CR to the product plate material 15 side. In addition, if the planar dimension D1 of the waste plate material 16 is 50 mm or less, the amount of waste plate material 16 discharged can be reduced, which makes it possible to improve the yield of plate-shaped articles 12, for example.

[0037] (1-4) The method for manufacturing the plate-shaped article 12 can be used in a method for manufacturing the plate-shaped article 12 from plate glass. Thus, even when using plate glass that is prone to crack propagation due to residual stress, it is possible to suppress the propagation of cracks in the plate-shaped article 12. Therefore, it is possible to improve the yield of the plate-shaped article 12 obtained by cutting plate glass.

[0038] (1-5) The method for manufacturing the plate-shaped article 12 can be used in a method for manufacturing a plate-shaped article 12 from glass containing 20% ​​by mass of PbO. In this way, even when using lead glass, which is prone to crack propagation due to residual stress, it is possible to suppress the propagation of cracks in the plate-shaped article 12. Therefore, it is possible to improve the yield of plate-shaped articles 12 obtained by cutting plate glass.

[0039] (1-6) In the method for manufacturing the plate-shaped article 12, the thickness dimension of the glass plate may be 6 mm or more. As the thickness dimension of the glass plate increases, residual stress is more likely to occur in the glass plate, and cracks tend to propagate when obtaining the plate-shaped article 12 from such glass plate. The above method for manufacturing the plate-shaped article 12 makes it possible to suitably suppress the propagation of cracks CR even when obtaining the plate-shaped article 12 from glass plate with a thickness dimension of 6 mm or more. Therefore, it is possible to improve the yield of plate-shaped articles with a thickness dimension of 6 mm or more.

[0040] (1-7) In the manufacturing method of the plate-shaped article 12, the cutting step is performed with the plate material 11 supported only by its own weight, so a holding mechanism for holding the plate material 11, such as a mechanism for sucking the plate material 11, is unnecessary. Therefore, it is possible to simplify the manufacturing equipment for the plate-shaped article 12.

[0041] (Second Embodiment) A second embodiment of the method for manufacturing the plate-shaped article 12 will be described, focusing on the differences from the first embodiment.

[0042] As shown in Figures 7 and 8, the manufacturing method for the plate-shaped article 12 of the second embodiment involves manufacturing a plurality of plate-shaped articles 12, namely the first plate-shaped article 12a and the second plate-shaped article 12b, from a plate material 11 having four sides.

[0043] As shown in Figure 7, the plate material 11 has a first cutting line SL1 and a second cutting line SL2 pre-set. The first cutting line SL1 corresponds to the first side S1 of the first plate-shaped article 12a shown in Figure 8. The second cutting line SL2 corresponds to the first side S1 of the second plate-shaped article 12b shown in Figure 8.

[0044] The plate material 11 has an unnecessary portion 18 provided between the first planned cutting line SL1 and the second planned cutting line SL2. The unnecessary portion 18 has a pre-set preliminary cutting line PL1 that separates the unnecessary portion 18 into the side facing the first planned cutting line SL1 and the side facing the second planned cutting line SL2.

[0045] In the first cutting step of the manufacturing method for the plate-shaped article 12, the unnecessary portion 18 of the plate material 11 is cut along the preliminary cutting line PL1, as shown by the arrow CP in Figure 7. This first cutting step divides the plate material 11 into a first semi-finished plate material 13a and a second semi-finished plate material 13b, as shown in Figure 9.

[0046] In the second cutting step of the manufacturing method for the plate-shaped article 12, the first semi-finished plate material 13a is cut along the first planned cutting line SL1, as shown by the arrow CP in Figure 9. This second cutting step divides the first semi-finished plate material 13a into the first product plate material 15a and the first unwanted plate material 16a, which is shown by the dashed line in Figure 9.

[0047] Furthermore, in the second cutting process, the second semi-finished sheet material 13b is cut along the second planned cutting line SL2, as indicated by the arrow CP in Figure 9. This second cutting process divides the second semi-finished sheet material 13b into the second product sheet material 15b and the second discarded sheet material 16b, which is shown by the dashed line in Figure 9.

[0048] In the second cutting step, the first semi-finished sheet material 13a may be cut first, followed by the second semi-finished sheet material 13b, or the second semi-finished sheet material 13b may be cut first, followed by the first semi-finished sheet material 13a. Alternatively, in the second cutting step, the first semi-finished sheet material 13a and the second semi-finished sheet material 13b may be cut simultaneously.

[0049] As shown in Figure 9, in the direction perpendicular to the first planned cutting line SL1, the planar dimension D1a of the first waste material 16a is smaller than the planar dimension D2a of the first product material 15a. Preferably, the planar dimension D1a of the first waste material 16a is 1 / 2 or less of the planar dimension D2a of the first product material 15a. Preferably, the planar dimension D1a of the first waste material 16a is within the range of 5 mm or more and 50 mm or less.

[0050] In the direction perpendicular to the second planned cutting line SL2, the planar dimension D1b of the second waste material 16b is smaller than the planar dimension D2b of the second product material 15b. Preferably, the planar dimension D1b of the second waste material 16b is 1 / 2 or less of the planar dimension D2b of the second product material 15b. Preferably, the planar dimension D1b of the second waste material 16b is within the range of 5 mm or more and 50 mm or less.

[0051] In the third cutting step of the manufacturing method for the plate-shaped article 12, the first product plate material 15a is cut along the third planned cutting line SL3, as shown by the arrow CP in Figure 9. This third cutting step divides the first product plate material 15a into the first plate-shaped article 12a shown in Figure 8 and the first end material 17a shown by the dashed line in Figure 9.

[0052] As shown in Figure 9, in the direction perpendicular to the third planned cutting line SL3, the planar dimension D3a of the first end piece 17a is smaller than the planar dimension D4a of the first plate-shaped article 12a. Preferably, the planar dimension D3a of the second unwanted plate material 16b is 1 / 2 or less of the planar dimension D4a of the first plate-shaped article 12a. Preferably, the planar dimension D3a of the second unwanted plate material 16b is in the range of 5 mm or more and 50 mm or less.

[0053] Furthermore, in the third cutting step, the second product plate material 15b is cut along the fourth planned cutting line SL4, as shown by the arrow CP in Figure 9. This third cutting step divides the second product plate material 15b into the second plate-shaped article 12b shown in Figure 8 and the second end material 17b shown by the dashed line in Figure 9.

[0054] As shown in Figure 9, in the direction perpendicular to the fourth planned cutting line SL4, the planar dimension D3b of the second end piece 17b is smaller than the planar dimension D4b of the second plate-shaped article 12b. Preferably, the planar dimension D3b of the second end piece 17b is 1 / 2 or less of the planar dimension D4b of the second plate-shaped article 12b. Preferably, the planar dimension D3b of the second end piece 17b is within the range of 5 mm or more and 50 mm or less.

[0055] Next, the operation and effects of the second embodiment will be described. (2-1) In the method for manufacturing the plate-shaped article 12, the plate material 11 has a first cutting line SL1, a second cutting line SL2, and an unnecessary portion 18. The method for manufacturing the plate-shaped article 12 includes a cutting step in which the plate material 11 is cut using a rotary blade RB, similar to the first embodiment. In the first cutting step, the plate material 11 is cut along a preliminary cutting line PL1 that separates the unnecessary portion 18 of the plate material 11 to the side of the first cutting line SL1 and the side of the second cutting line SL2, thereby dividing the plate material 11 into a first semi-finished plate material 13a and a second semi-finished plate material 13b.

[0056] In the first cutting step of the manufacturing method for the plate-shaped article 12, if the plate material 11 is cut along the preliminary cutting line PL1, cracks may propagate from the cut surface. However, since the preliminary cutting line PL1 is located between the first planned cutting line SL1 and the second planned cutting line SL2, it is possible to prevent the cracks from reaching the first planned cutting line SL1 and the second planned cutting line SL2. Furthermore, by cutting the plate material along the preliminary cutting line PL1, the residual stress at the periphery of the cut surface is reduced. Therefore, in the first and second cutting steps, even if cutting is performed along the first planned cutting line SL1 and the second planned cutting line SL2, it is possible to suppress the propagation of cracks CR toward the first product plate material 13a and the second product plate material 13b.

[0057] Furthermore, the planar dimensions of the first waste material 16a are smaller than those of the first product material 15a, and the planar dimensions of the second waste material 16b are smaller than those of the second product material 15b. Therefore, even if cracks CR propagate, the same effect as in the first embodiment is achieved. That is, in the second cutting process, cracks generated as cutting progresses by the rotary blade RB along the first planned cutting line SL1 tend to propagate more toward the first waste material 16a than toward the first product material 15a. Also, cracks generated as cutting progresses by the rotary blade RB along the second planned cutting line SL2 tend to propagate more toward the second waste material 16b than toward the second product material 15b. This makes it possible to suppress the propagation of cracks toward both the first product material 15a and the second product material 15b.

[0058] Therefore, when cutting a plate material 11 using a rotary blade RB to obtain multiple plate-shaped articles 12, it is possible to improve the quality of the edges of the multiple plate-shaped articles 12. This makes it possible to improve, for example, the yield of the plate-shaped articles 12.

[0059] (2-2) The method for manufacturing the plate-shaped article 12 of the second embodiment can also obtain the same effects as those of (1-2) to (1-7) of the first embodiment. (Example of change) The above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0060] In the first embodiment, the third cutting step in the manufacturing method of the plate-shaped article 12 may be omitted, and the product plate material 15 may be transported to a subsequent process as a plate-shaped article. Even in this case, the effects and advantages described in section (1-1) of the first embodiment can be obtained.

[0061] In the second embodiment, the third cutting step in the manufacturing method of the plate-shaped article 12 may be omitted, and the first product plate material 15a and the second product plate material 15b may be transported to a subsequent process as the first plate-shaped article and the second plate-shaped article, respectively. Also, in the second embodiment, the third cutting step in the manufacturing method of the plate-shaped article 12 may be a step of cutting either the first product plate material 15a or the second product plate material 15b. Even in this case, the effects and advantages described in section (2-1) of the second embodiment can be obtained.

[0062] The cutting step in the manufacturing method of the plate-shaped article 12 described above may include a fourth cutting step performed after the third cutting step. For example, the cutting step of the first embodiment may include a fourth cutting step in which the product plate material 15 is cut along sides other than the first side S1 and the second side S2.

[0063] In the cutting process of the manufacturing method for the plate-shaped article 12 described above, the third cutting step may be performed before the first cutting step. Alternatively, the third cutting step may be performed between the first and second cutting steps, or simultaneously with the first or second cutting step.

[0064] In the first embodiment, the preliminary cutting line PL1, the first planned cutting line SL1, and the second planned cutting line SL2 are set to be parallel to each other, but at least two of the lines can also be set to be non-parallel to each other. In the second embodiment as well, at least two of the preliminary cutting line PL1, the first planned cutting line SL1, the second planned cutting line SL2, the third planned cutting line SL3, and the fourth planned cutting line SL4 can also be set to be non-parallel to each other.

[0065] In the cutting step of the manufacturing method for the plate-shaped article 12 described above, the cutting edge of the rotary blade RB is positioned along the thickness direction of the plate material 11, and the plate material 11 is cut in one step along the thickness direction. However, the method is not limited to this cutting step. For example, the cutting step may be changed to one in which the position of the cutting edge of the rotary blade RB is adjusted, and the plate material 11 is cut in stages in multiple steps along the thickness direction.

[0066] In the cutting step of the manufacturing method for the plate-shaped article 12 described above, for example, the progress of cutting by the rotary blade RB along the preliminary cutting line PL1 may be carried out by moving the plate material 11 relative to the positioned rotary blade RB. That is, by moving the rotary blade RB and the plate material 11 relative to each other, for example, the rotary blade RB can be advanced along the preliminary cutting line PL1.

[0067] The uses of the plate-shaped article 12 are not particularly limited. For example, if the plate material 11 is plate glass, the composition of the glass is not particularly limited and may be alkali-free glass or glass containing an alkali component. Examples of uses for plate-shaped articles obtained from plate glass include display applications, touch panel applications, photoelectric conversion panel applications, electronic device applications, window glass applications, building material applications, and vehicle applications. [Explanation of Symbols]

[0068] 11...Plate material 11a...first principal surface 11b…Second main surface 12…Plate-shaped articles 12a...First plate-shaped article 12b...Second plate-shaped article 13...Semi-finished board material 13a...First semi-finished board material 13b…Second semi-finished board material 15...Plate materials for products 15a...Plate material for the first product 15b…Plate material for second product 16…Unnecessary board material 16a…1st unnecessary plate material 16b…Second unnecessary plate material 18...Unnecessary part D1... Planar dimensions of the unnecessary board material D1a... Planar dimensions of the first discarded sheet material D1b... Planar dimensions of the second unnecessary board material D2… Planar dimensions of product board material D2a... Planar dimensions of the sheet material for the first product D2b... Planar dimensions of sheet material for the second product. PL1...Prepared cutting line RB... Rotary blade S1... First side SL1…First planned cutting line SL2…Second planned cutting line

Claims

1. A method for manufacturing a plate-shaped article from a plate material having four sides and being brittle, The cutting process includes a step in which, with one of the two main surfaces of the plate material supported solely by its own weight, the plate material is cut by using a rotating blade to cut it in the thickness direction of the plate material. The cutting step includes a first cutting step of obtaining a semi-finished sheet material from the sheet material by cutting the sheet material along a preliminary cutting line that is outside the planned cutting line for forming one side of the sheet-shaped article, The process includes a second cutting step of cutting the semi-finished sheet material along the planned cutting line, thereby dividing the semi-finished sheet material into a sheet material for the product and a sheet material to be discarded. The first cutting step is a step of first cutting the plate material outside the planned cutting line, and a step of dividing the plate material into the semi-finished plate material and the remaining plate material with planar dimensions from which the plate-shaped article cannot be obtained. A method for manufacturing a plate-shaped article, wherein, in a direction perpendicular to the planned cutting line, the planar dimensions of the unnecessary plate material are smaller than the planar dimensions of the product plate material.

2. The method for manufacturing a plate-shaped article according to claim 1, wherein the planar dimensions of the waste plate material are 1 / 2 or less of the planar dimensions of the product plate material.

3. The method for manufacturing a plate-shaped article according to claim 1 or claim 2, wherein the planar dimensions of the aforementioned unnecessary plate material are within the range of 5 mm or more and 50 mm or less.

4. The method for manufacturing a plate-shaped article according to any one of claims 1 to 3, wherein the plate material is plate glass.

5. The method for manufacturing a plate-shaped article according to claim 4, wherein the plate glass is glass containing 20% ​​by mass or more of PbO.

6. The method for manufacturing a plate-shaped article according to claim 4 or claim 5, wherein the thickness dimension of the plate glass is 6 mm or more.

7. A method for manufacturing plate-shaped articles, comprising manufacturing a plurality of plate-shaped articles from a plate material having four sides and being brittle, The aforementioned plate material has a first planned cutting line for forming one side of the first plate-shaped article, A second cutting line for forming one side of the second plate-shaped article, It has an unnecessary portion provided between the first planned cutting line and the second planned cutting line, The manufacturing method includes a cutting step in which the plate material is cut using a rotating blade while one of the two main surfaces of the plate material is supported solely by its own weight, The cutting process includes a first cutting step which divides the sheet material into a first semi-finished sheet material and a second semi-finished sheet material by cutting the sheet material along a preliminary cutting line that separates the unnecessary portion of the sheet material into a first planned cutting line side and a second planned cutting line side, By cutting the first semi-finished sheet material along the first planned cutting line, the first semi-finished sheet material is divided into a first product sheet material and a first waste sheet material. The process includes a second cutting step of cutting the second semi-finished sheet material along the second planned cutting line, thereby dividing the second semi-finished sheet material into a second product sheet material and a second waste sheet material. A method for manufacturing a plate-shaped article, wherein, in a direction perpendicular to the first planned cutting line, the planar dimension of the first waste plate is smaller than the planar dimension of the first product plate, and in a direction perpendicular to the second planned cutting line, the planar dimension of the second waste plate is smaller than the planar dimension of the second product plate.

Images