SO, Yoo-Hong (202 Shinsungworldvil, 150-316Junggok4-dong, Gwangjin-gu, Seoul 143-897, KR)
Claims
[1] A mold for manufacturing a cutting wheel comprising a mold body 20a having a concave inner space 21 for containing materials for manufacturing the cutting wheel, a mold cover 20b for covering over the inner space of said mold body 20a, and a pressure-molding unit 30 for uniformly pressing powder material on the bottom of said mold body 20a or the bottom surface of said mold cover 20b, wherein said pressure-molding unit 30 is formed across the whole area of the bottom of said mold body 20a or the bottom surface said mold cover 20b and is made of wire mesh material 31.
[2] The mold of Claim 1, wherein the wire mesh material 31 of said pressure- molding unit 30 has a resin disk 33 provided on its one surface in order to absorb shock and increase the life of components.
[3] A mold for manufacturing a cutting wheel comprising a pressure-molding unit which is formed to uniformly press powder material on the top surface of the lower mold or the bottom surface of the upper mold for containing and molding the materials for manufacturing the cutting wheel, wherein said pressure-molding units 121 and 141 are formed on the top surface of the lower mold 120 or the bottom surface of the upper mold 140 and are made of wire mesh materials 121a and 141a.
[4] The mold of Claim 3, wherein said mold comprises a mold base 110 provided with a circular inner space 111 for containing materials in which said lower mold
120 and upper mold 140 are inserted; a lower mold which 120 is inserted in said inner space 111, and on the top surface of which is formed said pressure-molding unit 121, and at the center of which is formed a through hole 122; a pole 130 which is detachably inserted into the through hole of said lower mold so as to be protruded upward to a given length; and an upper mold 140 which is inserted in said inner space 111 and on the bottom of which is formed said pressure-molding unit 141 and at the center of which is formed a through hole 142 into which said pole 130 is detachably inserted.
[5] The mold of Claim 3 or 4, wherein the wire mesh material of said pressure- molding units 121 or 141 has an elastic plate 150 provided on its one surface in order to absorb shock and increase the life of components.
[6] The mold of Claim 5, wherein a hole 131 of a given diameter is formed at the center of said pole 130 and its top end portion has a taper shape with the outer diameter becoming smaller as it goes upward so as to be easily inserted into the through hole 122 of said lower mold 120 and the through hole 142 of said upper mold 140. |
Description MOLD FOR MANUFACTURING A CUTTING WHEEL
[1] TECHNICAL FIELD
[2] The present invention relates to a mold for manufacturing a cutting wheel, more specifically to a mold for manufacturing a cutting wheel, whereby ceramic powder mixture and core material, which are main materials of the cutting wheel, are put into the mold together and heated and pressed to form into a disk shape with the molding density made more uniform so as to manufacture a cutting wheel of better quality.
[3] BACKGROUND ART
[4] In general, a cutting wheel 10 refers to a disk-shaped wheel having a mounting hole at the center 10a, as shown in Fig. 6. If the cutting wheel is mounted on a tool such as a hand grinder, for example, and is rotated, so it can be used to cut or grind various materials by the cutting force of its circumference.
[5] A conventional process for manufacturing a cutting wheel will be described. As shown in Fig. 7, after preparing ceramic mixture 11, glass fiber core material 12 and non- woven fabric 90, the ceramic mixture 11 and the core material 12 are put into separate molds 20a and 20b, which make the cutting wheel shape into a circle, and heated and compressed under predetermined conditions.
[6] Here, the heating and compressing processes are carried out under predetermined conditions of about 20 to 40 ° C at a pressure of about 60 to 90 kg/cm 2 , for example. A plurality of cutting wheels formed like this are stacked in a lump and put in a sintering furnace (electric furnace) to be sintered for a given time under conditions of about 180 0 C at a pressure of about 2 kg/cm 2 , and then cooled to be finished.
[7] An important point in manufacturing as described above is that the ceramic mixture
11 made of powders is put on a circular bottom of the mold 20a covered with the non- woven fabric 90 and the core material 12 and the ceramic mixture 11 should be spread evenly so that the height becomes uniform before heating and compressing, otherwise a disk- shaped cutting wheel of uniform height cannot be made into a finished product.
[8] But because the conventional mold for manufacturing cutting wheels, as shown in
Fig. 8, is not provided with a separate means for evenly spreading the mixture, the mixture 11 is not distributed sufficiently uniformly even if spread while rotating the lower mold 20a, so even if the upper mold 20b is put in place, the thickness of the cutting wheel is not uniform. Furthermore, the cutting wheel 10 manufactured as described above generates vibration in the direction of disk thickness when it is mounted and rotated on a cutting tool. Due to such vibration, it has disadvantages that the life of cutting wheel is shortened, dust is excessively generated, and the cut surface is relatively rough.
[9] Since such a cutting wheel is a cutting tool, it is natural that the edge portion of the circumference is rough, but that the thickness of the disk is not uniform needs to be improved.
[10] Therefore, as shown in Fig. 9, a pressure-molding unit 30 is formed on the top surface inserted onto the pole 22 of the lower mold 20a and on the bottom surface of the upper mold 20b on which a through hole 23 inserted onto the pole 22 is formed, so that powder material that is on the bottom of the mold body or under the mold cover can be pressed uniformly.
[11] But such a conventional pressure-molding unit 30 has protuberances 32 formed in concentric circles, so if a cutting wheel 10 made by using the pressure-molding unit 30 provided with such protuberances of concentric circles is mounted and rotated on a cutting tool, vibration is generated in the direction of disk thickness. Due to this vibration, the life of the cutting wheel is shortened, dust is excessively generated, the cut surface is relatively rough, and the thickness of the disk is not uniform, so the drawback of sintering force being lowered still needs improvement.
[12] DETAILED DESCRIPTION OF THE INVENTION
[13] (Problem TO BE SOLVED BY THE INVENTION)
[14] The present invention is to solve such conventional problems as described above with an object to provide a mold for manufacturing a cutting wheel, in which main material ceramic powder mixture and core material are put into a mold together to be heated and pressed to form into a disk shape, the molding density is made as uniform as possible, so that the binding force of the main raw materials of ceramic and resin is enhanced to prolong the life of the cutting wheel, and also, when the cutting wheel is mounted on a hand grinder, the shortening of the life due to the vibration and generation of excessive dust are prevented for the accomplishment of more precise cutting.
[15] (TECHNICAL SOLUTION)
[16] To achieve the above objects, there is provided a mold for manufacturing a cutting wheel comprising a mold body having a concave inner space for containing materials for manufacturing the cutting wheel, a mold cover for covering over the inner space of said mold body, and a pressure-molding unit for uniformly pressing powder material on the bottom of said mold body or the bottom surface of said mold cover, wherein said pressure-molding unit is formed across the whole area of the bottom of said mold body or the bottom surface said mold cover and is made of wire mesh material.
[17] Preferably, the wire mesh material of said pressure-molding unit has a resin disk provided on its one surface in order to absorb shock and increase the life of components.
[18] In accordance with the present invention, there is provided a mold for manufacturing
a cutting wheel comprising a pressure-molding unit which is formed to uniformly press powder material on the top surface of the lower mold or the bottom surface of the upper mold for containing and molding the materials for manufacturing the cutting wheel, wherein said pressure-molding units are formed on the top surface of the lower mold or the bottom surface of the upper mold and are made of wire mesh materials.
[19] Preferably, said mold comprises a mold base provided with a circular inner space for containing materials in which said lower mold and upper mold are inserted; a lower mold which is inserted in said inner space, and on the top surface of which is formed said pressure-molding unit, and at the center of which is formed a through hole; a pole which is detachably inserted into the through hole of said lower mold so as to be protruded upward to a given length; and an upper mold which is inserted in said inner space and on the bottom of which is formed said pressure-molding unit and at the center of which is formed a through hole into which said pole is detachably inserted.
[20] Preferably, the wire mesh material of said pressure-molding units has an elastic plate provided on its one surface in order to absorb shock and increase the life of components.
[21] Preferably, a hole of a given diameter is formed at the center of said pole and its top end portion has a taper shape with the outer diameter becoming smaller as it goes upward so as to be easily inserted into the through hole of said lower mold and the through hole of said upper mold.
[22] (ADVANTAGEOUS EFFECTS)
[23] According to the mold for manufacturing a cutting wheel of the present invention, the pressure-molding unit for pressing the powder material uniformly is formed on the top surface of the lower mold or the bottom surface of the upper mold for containing and forming the materials to manufacture the cutting wheel, and this pressure-molding unit is made of wire mesh material, so it is possible to produce a cutting wheel of uniform density by providing a uniform compression force during molding for manufacturing the cutting wheel.
[24] Also, according to the mold for manufacturing a cutting wheel of the present invention, an elastic plate is provided between the wire mesh material of the pressure- molding unit and the upper mold and between the wire mesh material and the lower mold, so shock can be absorbed and the life of the elastic plate can be increased.
[25] Also, according to the mold for manufacturing a cutting wheel of the present invention, the structure is such that the lower mold and upper mold are extracted from the inner space of the mold base, and the pole is extracted from the center of the lower mold and upper mold, so it is very easy to separate the cutting wheel after molding.
[26] Further, according to the mold for manufacturing a cutting wheel of the present invention, a hole is formed at the center of the pole axis, so if the mold is rotated by
inserting a tool into the hole, there is an effect that the ceramic is spread to a uniform thickness.
[27] BRIEF DESCRIPTION OF THE DRAWINGS
[28] These and other objects, features, aspects, and advantages of preferred embodiments of the present invention will be more fully described in the following detailed description, taken in conjunction with the accompanying drawings. In the drawings:
[29] FIG. 1 is an exploded perspective view showing a mold for manufacturing a cutting wheel according to an embodiment of the present invention;
[30] Fig. 2 is a sectional view showing the state of assembly of Fig. 1;
[31] Fig. 3 is an exploded perspective view showing a mold for manufacturing a cutting wheel according to another embodiment of the present invention;
[32] Fig. 4 is a sectional view showing the state of assembly of Fig. 3;
[33] Fig. 5 is a schematic sectional view for describing the method of manufacturing a cutting wheel according to another embodiment of the present invention;
[34] Fig. 6 is a perspective view showing a cutting wheel molded by using core material in general;
[35] Fig. 7 is a schematic drawing for describing the state of manufacturing a cutting wheel by using a conventional mold for manufacturing a cutting wheel;
[36] Fig. 8 is an exploded perspective view illustrating an example of a conventional mold for manufacturing a cutting wheel; and
[37] Fig. 9 is an exploded perspective view illustrating another example of a conventional mold for manufacturing a cutting wheel.
[38] [ Description of numerals for major parts in drawings ]
[39] 10: cutting wheel 11: mixture
[40] 20: mold 20a: mold body
[41 ] 20b : mold cover 21 : inner space
[42] 30: pressure-molding unit 31: wire mesh material
[43] 33: elastic plate 100: mold
[44] 110: mold base 111: inner space
[45] 120: lower mold 121: pressure-molding unit
[46] 122: through hole 130: pole
[47] 131: hole 140: upper mold
[48] 141: pressure-molding unit 121a, 141a: wire mesh material
[49] 142: through hole 150: elastic plate (resin disk)
[50] BEST MODE FOR CARRYING OUT THE INVENTION
[51] Below will be described in detail the mold for manufacturing a cutting wheel according to a preferred embodiment of the present invention with reference to the accompanying drawings.
[52] Fig. 1 is an exploded perspective view showing a mold for manufacturing a cutting wheel according an embodiment of the present invention, and Fig. 2 is a sectional view for describing the state of assembly of Fig. 1. The portions identical with Fig. 6 and Fig. 7 for describing the prior art have identical reference symbols so description will be omitted.
[53] As shown in Fig. 1 and Fig. 2, a mold for manufacturing a cutting wheel comprises a mold body 20a having an inner space 21 for containing materials and a mold cover 20b for covering the inner space of the mold body 20a. At the center of the bottom of the mold body 20a is formed a pole 22, and at the center of the mold cover 20b is formed a through hole 23.
[54] At this time, the present invention is characterized in that the pressure-molding unit
30 for uniformly pressing powder material is formed on the bottom surface of the internal bottom of the mold body 20a or the bottom surface of the mold cover 20b.
[55] Here, the pressure-molding unit 30 is provided with a wire mesh material 31 as shown in Fig. 1.
[56] And under the wire mesh material 31, it is preferable to provide a resin disk (elastic plate; 33) so as to increase the life of components.
[57] Namely, the mold 20 for manufacturing a cutting wheel according to an embodiment of the present invention comprises a mold body 20a having a concave inner space 21 for containing materials for manufacturing the cutting wheel 10 and a mold cover 20b for covering the inner space of the mold body 20a. On the bottom of the mold body 20a or the bottom surface of the mold cover 20b is formed a pressure-molding unit 30 for pressing the powder material uniformly. This pressure-molding unit 30 is characterized in that it is made of a wire mesh material 31 that is formed across the whole area on the bottom of the mold body 20a or the bottom surface of the mold cover 20b.
[58] In addition, the wire mesh material 31 of the pressure-molding unit 30 is characterized in that one surface thereof is provided with an elastic plate 33 so as to absorb shock and increase the life of components.
[59] As shown in Fig. 1 and Fig. 2, looking at the construction of the pressure-molding unit 30, a wire mesh material 31 is covered across the whole area on the bottom of the mold body 20a or the bottom surface of the mold cover 20b. The tip of the edge of the wire mesh is buried in an insert slot 31a for finishing that is defined by the side surface of the elastic plate 33 and the inner walls of the mold body or the mold cover.
[60] According to the mold set constructed like this, after putting materials and ingredients for manufacturing the cutting wheel in the inner space 21 of the mold body 20a and spreading them uniformly, it is possible to press materials with a uniform compression force across the whole area thereof when putting in place the mold cover 20b and pressing.
[61] Also, when the cutting wheel is rotated by the slots, air resistance is uniformly applied across the whole area thereof, so the cutting ability of the cutting wheel is improved, and the lateral vibration due to air resistance during the rotation of the cutting wheel is suppressed, so the cut cross section becomes clean.
[62] Meanwhile, Figs. 3 to 5 are drawings illustrating another embodiment of the present invention. Looking at the mold for manufacturing a cutting wheel according to this embodiment, the pressure-molding unit for uniformly pressing powder material is formed on the top surface of the lower mold or the bottom of the upper mold for containing and molding the materials for manufacturing the cutting wheel 10. At this time, the pressure-molding units 121 and 141 are characterized in that they are formed on the top surface of the lower mold or the bottom of the lower mold and are made of wire mesh materials 121a and 141a.
[63] Therefore, according to the mold for manufacturing the cutting wheel of the present invention, both of the lower mold 120 and upper mold 140 composing the mold for manufacturing a cutting wheel 10 are provided with wire mesh materials 121a and 141a of the pressure-molding unit 121 and 141, and this structure belongs to the scope of the present invention.
[64] Here, the mold 100 comprises, as shown in Fig. 3, a mold base 110 provided with a circular inner space 111 into which the lower mold 120 and the upper mold 140 are inserted; a lower mold 120 which is inserted into the inner space 111 and on the top surface of which is formed a pressure-molding unit 121, and at the center of which is formed a through hole 122; a pole 130 which is detachably inserted into the through hole of the lower mold so as to be protruded upward to a given length; and an upper mold 140 at the center of which is formed a through hole 142 into which the pole 130 is detachably inserted.
[65] In the present embodiment, the mold base 110 is made in a circular ring shape, but it may have various shapes such as a square shape. But considering workability, a circular ring shape is preferable.
[66] Accordingly, it is easy to separate from the mold base 110 the cutting wheel 10 molded by the pressure-molding units 121 and 141 that are formed in the lower mold 120 and upper mold 140, and it is also easy to separate the lower mold 120 and upper mold 140 from the pole 130, so it is very easy to separate these parts after molding.
[67] In addition, the wire mesh materials 121a and 141a of the pressure-molding units 121 and 141 have a characteristic that they have an elastic plate (resin disk: 150) of synthetic resin, rubber, urethane, etc. provided on one surface thereof so as to impart elastic force to the wire mesh material, in order to absorb shock and increase the life of components.
[68] Accordingly, when the lower mold 120 and the upper mold 140 are pressed and
heated in a press (not shown), the elastic plate 150 prevents or delays the pressure- molding units 121 and 141 of the wire mesh materials 121a and 141a from being damaged by shock or easily becoming unusable.
[69] In addition, a hole 131 of a given diameter is formed at the center of the pole 130, and its top end portion has a taper shape with the outer diameter becoming smaller as it goes upward so as to be easily inserted into the upper and lower though holes 122 and 142 of the lower mold 120 and upper mold 140.
[70] Since a hole 131 is formed in the pole 130, it is possible to uniformly spread the mixture 11 over the pressure-molding unit 121 of the lower mold 120 when rotating the mold 100 by fixing the jig. Also, since the pole 130 has a taper shape with the outer diameter becoming smaller as it goes up the pole 130, the assembly work is very easy when assembling the upper mold 140 and the lower mold 120.
[71] Let's take a look at the molding of a cutting wheel 10 by using a mold 100 according to another embodiment of the present invention. As shown in Fig. 5, the lower mold 120 is inserted in the inner space 111 of the mold base 110, and the pole 130 is inserted in the through hole 122 of the lower mold 120. Next, the non- woven fabric 90 and glass fiber core material 12 are placed on the pressure-molding unit 121 of the lower mold 120. Next, a proper quantity of mixture 11 is weighed and put thereon and spread uniformly, and then non- woven fabric 90 and glass fiber core material 12 are placed on top of this. Subsequently, the upper mold 140 is inserted on the pole 130, and the upper mold 140 and the lower mold 120 are heated and respectively pressed downwards and upwards for a given time, then they are pressed by the pressure-molding units 121 and 141 made of wire mesh material 121a and 141a to make dense pressure molding.
[72] Subsequently, after the mold base 110 is removed from the mold 100 in an assembled condition, the upper mold 140 and the lower mold 120 and the pole 130 are removed, at which time there is a molded cutting wheel 10 made of non- woven fabric 90, glass fiber core material 12 and mixture 11. After this, the cutting wheel 10 molded as described above is sintered for a given time and cooled before shipping.
[73] INDUSTRIAL APPLICABILITY
[74] As described above, the pressure-molding unit for pressing the powder material uniformly is formed on the top surface of the lower mold or the bottom surface of the upper mold for containing and forming the materials to manufacture the cutting wheel, and this pressure-molding unit is made of wire mesh material, so it is possible to produce a cutting wheel of uniform density by providing a uniform compression force during molding for manufacturing the cutting wheel.
[75] Although the present invention has been described in connection with the exemplary embodiments illustrated in the drawings, it is only illustrative. It will be understood by those skilled in the art that various modifications and equivalents can be made to the
present invention. Therefore, the true technical scope of the present invention should be defined by the appended claims.