JP4960429B2 - Manufacturing method of scribing wheel - Google Patents

Description

The present invention relates to a method of manufacturing a scribing wheel for scribing a brittle material substrate such as a glass plate.

  Conventionally, when a brittle material substrate such as a glass plate or a ceramic substrate is cut, a scribe line is first formed on these substrates along a desired line, and after being scribed, the substrate is cut along the scribe line. A scribing wheel used for scribing is used by inserting a pin for pivotal support into a hole of an abacus-shaped scribing wheel having a disc shape and an outer peripheral portion cut out in a tapered shape.

  For example, in Patent Document 1, there is a scribing wheel in which pins are divided into two parts, each provided with a flange portion, and a pair of pins are sandwiched between wheel bodies made of abacus-shaped sintered diamond and joined by soldering or the like. It is used.

  Patent Document 2 also discloses a scribing wheel formed by integrating a shaft and a scribing wheel main body. This scribing wheel has a rhombus shape in cross section, and is used with both ends held by a chip holder.

JP 2001-58841 A International Publication WO2003 / 51784

  However, in the case of inserting the pin into the wheel main body, it is necessary to insert and fix the pin accurately without centering on the central axis of the wheel main body, and it is difficult to ensure high accuracy. Further, it is necessary to fix the pin to the wheel main body by brazing or the like, and there is a drawback that the sintered diamond layer is damaged by heating during brazing. Further, the scribing wheel in which the shaft and the wheel are integrated has a problem that the degree of freedom in manufacturing is small, and the angle of the ridge line portion of the blade edge and the distance between the shafts cannot be arbitrarily selected.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a manufacturing method of a scribing wheel that can be easily manufactured with high accuracy without causing a runout with an arbitrary dimension. And

  In order to solve this problem, the scribing wheel manufacturing method of the present invention uses a cylindrical work material in which a cylindrical portion of a sintered diamond layer is formed coaxially at one end of a cylindrical member made of cemented carbide. The cemented carbide is rotated while holding the cylindrical portion, and a pair of coaxial cylindrical shaft portions and a wheel main body sandwiched between the cylindrical shaft portions are formed in the sintered diamond layer portion by wire electric discharge machining, The wheel main body is rotated while holding the cylindrical portion of the alloy, and is formed into a taper shape by polishing each outer end of the cylindrical shaft portion, and is rotated while holding the cylindrical portion of the cemented carbide. After the ridge line part of the part is polished at a predetermined angle to form a blade edge part, the sintered diamond layer is manufactured by cutting the cemented carbide layer side.

  Here, at the time of forming the cylindrical shaft portion and the wheel main body portion by the wire electric discharge machining, a tapered portion is simultaneously formed outside the cylindrical shaft portion, and at the time of polishing the tapered portion of the cylindrical shaft portion, polishing is performed by wire electric discharge machining. The altered layer on the surface may be removed.

  According to the scribing wheel of the present invention having such characteristics, the thickness of the cylindrical shaft portion can be changed by appropriately changing the distance between the processing line (the wire travel locus (processing part) of the wire electric discharge machine) and the central axis. Can be arbitrarily selected. Moreover, the space | interval between cylindrical axial parts, the thickness of a wheel main-body part, and the angle of a blade edge | tip part can be selected arbitrarily. Further, by polishing only the tapered portion and the blade edge portion of the cylindrical shaft end portion that requires high accuracy and leaving the other portions as electrical discharge machining, a scribing wheel with desired accuracy can be obtained with minimum man-hours and cost. .

FIG. 1 is a front view and a right side view of a scribing wheel according to a first embodiment of the present invention. FIG. 2A is a perspective view showing a material block 10 used for manufacturing the scribing wheel of the present embodiment. FIG. 2B is a perspective view showing the processed material 20 cut out from the material block. FIG. 2C is a diagram showing a machining line (machining part) of electric discharge machining in the machining material. FIG. 2D is an enlarged view showing the sintered diamond layer after electric discharge machining. FIG. 3 is a diagram showing a modification of the first embodiment. FIG. 4 is a front view and a right side view of a scribing wheel according to the second embodiment of the present invention. FIG. 5 is a front view and a right side view of a scribing wheel according to the third embodiment of the present invention. FIG. 6 is a front view and a right side view of a scribing wheel according to the fourth embodiment of the present invention. FIG. 7 is a front view and a right side view of a scribing wheel according to a fifth embodiment of the present invention. FIG. 8 is a partially enlarged view of a cutting edge portion of a scribing wheel according to a fifth embodiment of the present invention. FIG. 9 is a partially enlarged view showing an example of the groove of the cutting edge of the scribing wheel according to each embodiment of the present invention.

(First embodiment)
A scribing wheel according to a first embodiment of the present invention will be described. FIG. 1A is a front view of the scribing wheel, and FIG. 1B is a right side view thereof. As shown in these drawings, the scribing wheel 1A has a disc-shaped wheel main body 2A at the center, and a taper including a ridgeline of the maximum circumference included in one plane at the center in the thickness direction of the wheel main body 2A. A shaped portion is formed as the blade edge portion 3A. Further, cylindrical shaft portions 4 and 5 are coaxially provided on both sides of the wheel main body portion 2A. Tapered portions 6 and 7 having the same inclination angle α are formed at the outer ends of the cylindrical shaft portions 4 and 5, respectively. The scribing wheel 1A is integrally formed of sintered diamond.

  Next, a method for manufacturing the scribing wheel 1A according to the present embodiment will be described. 2A to 2D are diagrams showing a manufacturing process of the scribing wheel 1A according to the present embodiment. FIG. 2A shows a material block 10, and a sintered diamond layer 12 having a predetermined thickness is integrally formed on an upper part of a cylindrical cemented carbide 11. For example, the material block 10 has a diameter of 30 mmφ and a height of 16 mm, the sintered diamond layer 12 has a thickness of 3 mm, and the cemented carbide layer 11 has a thickness of 13 mm.

(Forming processed materials)
Now, many cylindrical members are cut out by wire electric discharge machining in parallel to the central axis of the material block 10. As a result, as shown in FIG. 2B, for example, 40 to 50 elongated workpieces 20 can be obtained. This processed material 20 is, for example, a cylindrical material having a diameter of 2.0 to 3.5 mm and a length of 16 mm. The workpiece 20 is also composed of a cemented carbide layer 21 and a sintered diamond layer 22.

(Wire EDM)
Next, in FIG. 2C, the left side portion of the cemented carbide layer 21 of the workpiece 20 is fixed by a chuck and rotated about the central axis of a cylinder indicated by a one-dot chain line, and is discharged by a wire electric discharge machine. 21 and the portion of the sintered diamond layer 22 are cut out as shown in FIG. 2C. Here, the locus of electric discharge machining is indicated by machining lines 30-39. The processing line 30 is notched at a predetermined angle with respect to the central axis of the cylinder indicated by the alternate long and short dash line, the processing line 31 is parallel to the central axis, and the processing line 32 forms a taper line slightly thicker than this. Is. The machining line 33 is parallel to the central axis, the machining line 34 is a machining line formed by forming a taper with a different diameter after the machining line 33 is finished, and the machining line 35 has a cutting edge 3A on the wheel body 2A. The tapered portion for forming and the processing line 36 are also tapered portions having the opposite inclination. Further, the processing line 37 is a line for reducing the diameter, the processing line 38 is symmetric with the processing line 33 and is parallel to the central axis having the same thickness, and the processing line 39 is symmetrical with the processing line 32. It has a processing line. Here, all the processing lines 31 to 39 are formed of the sintered diamond layer 22. The processing lines 32 and 39 are set slightly larger than the inclined surfaces of the tapered portions 6 and 7 and leave a margin for cutting which will be described later. The processing lines 35 and 36 are set slightly larger than the slope of the cutting edge portion 3A, and leave a margin for cutting which will be described later.

  When the electric discharge machining is completed, the sintered diamond layer 22 becomes a rotating body having a shape of a scribing wheel, as shown in a partially enlarged front view in FIG. 2D. The right side view is substantially the same as FIG.

(Rough shape forming (polishing) process)
Next, the rough shape forming step will be described. During electric discharge machining, the surface becomes high temperature, a work-affected layer is formed, and the surface has deteriorated from the surface to several tens of μm. For this reason, high accuracy cannot be maintained during use with the electric discharge machining. In particular, since the tapered portions 6 and 7 shown in FIG. 1 (a) are in direct contact with the bearing, it is necessary to remove the work-affected layer and form an accurate tapered surface. Therefore, after electric discharge machining along the machining lines 32 and 39, polishing is performed to further increase the surface accuracy. In the polishing step, the surface of the tapered surface is polished by fixing the left side of the cemented carbide layer 21 with a chuck and rotating it around the axis of the cylinder as in the case of wire electric discharge machining. By this polishing process, the altered layer formed during processing of the processing lines 32 and 39 can be removed, and the angles of the tapered portions 6 and 7 at the tips of the left and right cylindrical shaft portions 4 and 5 can be accurately formed. .

  Further, the polishing process is similarly performed on the blade edge portion 3A of the wheel main body 1A. In particular, the cutting edge portion 3A shown in FIG. 1 (a) is in direct contact with a glass plate or the like to be scribed, and therefore needs to be an accurate surface. Therefore, in order to remove the deteriorated layer formed along the processing lines 35 and 36, the cemented carbide layer 21 is fixed by a chuck and rotated around the axis of the cylinder to perform polishing. The altered layer can be removed by polishing and the angle of the sharp blade edge 3A can be set accurately. The angle of the blade edge portion 3A is, for example, about 75 to 170 °, particularly about 90 to 150 °.

(Cutting process)
2D, the portion of the sintered diamond layer 21 on the cemented carbide layer side indicated by the alternate long and short dash line is cut away so that the wheel main body portion 2A and the cylindrical shaft portions 4, 5 are all sintered diamond layer 22 as shown in FIG. A scribing wheel 1A can be obtained. In this case, the cut surface may be polished so as to be symmetrical. However, since the tapered further tip portion enters the through-hole of the bearing in use, the tapered portion 6 as shown in FIG. The tip may be left a little, and may not be polished.

  The completed scribing wheel 1A chucks and holds the left side portion of the cemented carbide layer 21 and rotates it for wire electric discharge machining or cutting, so that the axis of the wheel main body 2A and the cylindrical shaft portions 4 and 5 are accurately aligned. Can be adapted to Further, by appropriately changing the distance between the processing lines 33 and 38 and the central axis, the thickness of the cylindrical shaft portions 4 and 5 can be arbitrarily selected. The interval between the cylindrical shaft portions 4 and 5 and the thickness of the wheel main body portion 2A are arbitrarily selected according to the angle of the machining lines 35 and 36 by changing the interval between the machining lines 34 and 37. be able to. For a scribing wheel with a rhombus-shaped side surface where the conventional shaft and wheel body are integrated, the angle of the tapered surface of the blade tip, the angle and spacing of the tapered surface of the cylindrical shaft, and the outer diameter of the blade tip can be freely set However, in the present embodiment, these can be arbitrarily set independently. Further, by polishing only the tapered portion and the blade edge portion of the cylindrical shaft portion requiring high accuracy and leaving the other portions as electric discharge machining, a scribing wheel with desired accuracy can be obtained with the minimum man-hour and cost.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The scribing wheel 1B according to the second embodiment is the same as that of the first embodiment except for the wheel main body 2B and the blade edge 3B. In the manufacturing process of the scribing wheel 1B, only a part of the processing line is different from the subsequent polishing process. In the second embodiment, instead of the processing lines 35 and 36 shown in FIG. 2C, a two-step tapered surface is formed by the processing lines 41a and 41b and the processing lines 42a and 42b as shown in FIG. 4A. It is a thing. Other wire electric discharge machining lines are the same as those in the first embodiment. The polishing of the left and right tapered portions 6 and 7 is the same as that in the first embodiment. For the polishing of the wheel main body 2B, it is sufficient to polish the left and right slopes formed by the processing lines 41b and 42b, which are inclined portions close to the ridgeline of the cutting edge portion 3B. In this case, the angle of the polishing process can be appropriately selected only by the blade edge portion 3B. Thereafter, the scribing wheel 1B is completed by cutting at the tip of the tapered portion 6.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The scribing wheel 1C according to the third embodiment is the same as that of the first embodiment except for the wheel main body 2C and the blade edge 3C. In the manufacturing process of the scribing wheel 1C, only a part of the processing line is different from the subsequent polishing process. In the third embodiment, instead of the processing lines 34 to 37 shown in FIG. 2C, two-step tapered surfaces are formed by processing lines 43a and 43b and processing lines 44a and 44b as shown in FIG. is there. Other wire electric discharge machining lines are the same as those in the first embodiment. The polishing of the left and right tapered portions 6 and 7 is the same as that in the first embodiment. For the polishing of the wheel main body 2C, it is sufficient to polish only the slope formed by the processing lines 43b and 44b, which are the inclined portions of the cutting edge 3C close to the ridgeline. Also in this case, the angle of the polishing process can be appropriately selected only by the blade edge portion 3C. Thereafter, the scribing wheel 1C is completed by cutting at the tip of the tapered portion 6.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The scribing wheel 1D according to the fourth embodiment is the same as that of the first embodiment except for the wheel main body 2D and the blade edge 3D. In the manufacturing process of the scribing wheel 1D, only a part of the processing line is different from the subsequent polishing process. In the fourth embodiment, in place of the processing lines 34 to 37 shown in FIG. 2C, as shown in FIG. 6A, three stages of tapered surfaces are formed by the processing lines 45a, 45b, 45c and the processing lines 46a, 46b, 46c. It was made to become. Other wire electric discharge machining lines are the same as those in the first embodiment. The polishing of the left and right tapered portions 6 and 7 is the same as that in the first embodiment. For the polishing of the wheel main body 2D, it is sufficient to polish only the slope formed by the processing lines 45c and 46c, which are the inclined portions of the cutting edge 3D close to the ridgeline. Also in this case, the angle of the polishing process can be appropriately selected only by the blade edge portion 3D. Thereafter, the scribing wheel 1D is completed by cutting at the tip of the tapered portion 6.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The scribing wheel 1E according to the fifth embodiment is the same as that of the first embodiment except for the wheel main body 2E and the blade edge 3E. In the manufacturing process of the scribing wheel 1E, only a part of the processing line is different from the subsequent polishing process. In the fifth embodiment, instead of the processing lines 34 to 37 shown in FIG. 2C, processing lines 47a to 47e and processing lines 48a to 48e are formed as shown in the partial enlarged views of FIGS. It is. Other wire electric discharge machining lines are the same as those in the first embodiment. In this embodiment, the blade edge portion 3E has a disc portion 49 provided in the center of the wheel main body portion 2E, and its ridge line is configured as a tapered blade edge. The polishing of the left and right taper portions 6 and 7 is the same as in the first embodiment. For the polishing of the wheel main body 2E, it is sufficient to polish only the slope forming the ridgeline of the cutting edge 3E formed by the processing lines 47e and 48e. Also in this case, the angle of the polishing process can be appropriately selected only by the blade edge portion 3E. Thereafter, the scribing wheel 1E is completed by cutting at the tip of the tapered portion 6.

  Also, in the second to fifth embodiments described above, the cut sintered diamond surface may be polished so as to be bilaterally symmetric, but the tapered tip further enters the through hole of the bearing when in use. Therefore, as in the modification of the first embodiment shown in FIG. 3, the tip of the tapered portion 6 may be left slightly and may not be polished.

  In each of the above-described embodiments, as shown in Japanese Patent No. 3074143 and WO2007 / 004700, a groove having a predetermined shape may be formed in the ridge line portion of the blade edge. Here, the predetermined shape of the groove may be, for example, a U-shaped, V-shaped, sawtooth wave or rectangular groove as shown in FIGS. Protrusions having a predetermined interval can be formed on the outer peripheral portion of the scribing wheel by forming such grooves by grinding, fine electric discharge, or thermal processing such as laser. Here, the pitch of the grooves is set to, for example, 20 μm or more according to the outer diameter, and the depth of the grooves is set to, for example, 2 to 20 μm according to the outer shape. By forming such a groove, when a scribe line is formed on a brittle material substrate such as a glass substrate, it does not slip, and a vertical crack can be extended deeply, so that division after scribe becomes easy. . By appropriately selecting the pitch and the depth of the groove, it is possible to balance the biting (breaking) performance with respect to the glass surface and the performance of extending the vertical crack deeply.

  The present invention can be usefully used in a scribing apparatus for scribing and cutting a brittle material substrate.

1A, 1B, 1C, 1D, 1E Scribing wheel 2A, 2B, 2C, 2D, 2E Wheel body 3A, 3B, 3C, 3D, 3E Cutting edge 4,5 Cylindrical shaft 6,6 Taper 10 Material block 11, 21 Cemented carbide 12, 22 Sintered diamond layer 20 Work material 30-39, 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, 45a-45c, 46a-46c, 47a-47e, 48a-48e Line 49 disc

Claims (2)

Using a cylindrical processed material in which a cylindrical portion of a sintered diamond layer is coaxially formed at one end of a cylindrical member made of cemented carbide,
Rotating while holding the cylindrical portion of the cemented carbide, forming a pair of coaxial cylindrical shaft portions and a wheel body portion sandwiched between the cylindrical shaft portions in the sintered diamond layer portion by wire electric discharge machining,
Rotate while holding the cylindrical portion of the cemented carbide, and by forming the outer end of each of the cylindrical shaft portion into a tapered shape,
Rotating while holding the cylindrical portion of the cemented carbide, the edge portion of the wheel body portion is polished to a predetermined angle to form a cutting edge portion,
A manufacturing method of a scribing wheel manufactured by cutting the sintered diamond layer and the cemented carbide layer. When forming the cylindrical shaft portion and the wheel main body portion by the wire electric discharge machining, a tapered portion is simultaneously formed on the outside of the cylindrical shaft portion,
Wherein during polishing of the tapered portion of the cylindrical shaft portion, scribing wheel manufacturing method according to claim 1, wherein removing the affected layer of the surface by wire electric discharge machining.

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