阅读说明：本技术 研磨磨具的制造方法和研磨磨具 (Method for producing grinding tool and grinding tool ) 是由 马路良吾 于 2021-06-02 设计创作，主要内容包括：本发明提供研磨磨具的制造方法和研磨磨具,该研磨磨具能够使用于金属、陶瓷的表面的研磨。研磨磨具的制造方法具有：玻璃粒提供步骤,向模框提供玻璃粒；以及烧制步骤,将收纳有该玻璃粒的该模框在超过该玻璃粒的软化点且低于熔点的温度下进行加热,形成成为研磨磨具的玻璃块,在该烧制步骤中,在气泡分散地残存在该玻璃粒之间的间隙中的状态下结束加热。优选该玻璃粒为钠玻璃、长石或硼硅酸玻璃。另外,优选实施该烧制步骤后的该玻璃块的表面粗糙度Ra为0.2μm以上且1.5μm以下,气孔率为2％以上且8％以下。而且,优选该烧制步骤在1小时以上且2小时以内实施。(The invention provides a method for manufacturing a grinding tool and a grinding tool, wherein the grinding tool can be used for grinding the surfaces of metal and ceramics. The method for manufacturing the grinding tool comprises the following steps: a glass bead supply step of supplying glass beads to the mold frame; and a firing step of heating the mold frame containing the glass pellets at a temperature exceeding the softening point and lower than the melting point of the glass pellets to form a glass gob to be a grinding wheel, wherein in the firing step, heating is terminated in a state where bubbles remain dispersed in gaps between the glass pellets. Preferably, the glass pellets are soda glass, feldspar or borosilicate glass. Preferably, the surface roughness Ra of the glass block after the firing step is 0.2 to 1.5 μm, and the porosity is 2 to 8%. Further, the firing step is preferably performed for 1 hour or more and 2 hours or less.)

1. A method for manufacturing a grinding tool is characterized in that,

the method for manufacturing the grinding tool comprises the following steps:

a glass bead supply step of supplying glass beads to the mold frame; and

a firing step of heating the mold frame containing the glass particles at a temperature exceeding the softening point and lower than the melting point of the glass particles to form a glass gob to be a grinding stone,

in the firing step, heating is terminated in a state where bubbles remain dispersedly in the gaps between the glass particles.

2. The method of manufacturing an abrasive tool according to claim 1,

the glass particles are soda glass, feldspar or borosilicate glass.

3. The method of manufacturing an abrasive tool according to claim 1 or 2,

the surface roughness Ra of the glass block after the firing step is 0.2 to 1.5 [ mu ] m, and the porosity is 2 to 8%.

4. The method of manufacturing an abrasive tool according to any one of claims 1 to 3,

the firing step is performed for 1 hour or more and 2 hours or less.

5. A grinding tool for grinding a metal or ceramic surface,

the abrasive grinding tool is composed of a glass block having a surface roughness Ra of 0.2 to 1.5 [ mu ] m and a porosity of 2 to 8%.

6. The abrasive grinding tool of claim 5,

the abrasive article does not contain abrasive particles.

Technical Field

The present invention relates to a method for producing a grinding wheel used for grinding a metal or ceramic surface, and a grinding wheel.

Background

When a surface of metal or ceramic is processed, minute irregularities or minute projections called burrs may be generated on the surface. An Arkansas (Arkansas) grinding wheel is known as a grinding wheel used for removing such irregularities and burrs from the surface. For example, in a processing apparatus for processing a workpiece such as a semiconductor wafer, an aken-colored grindstone is used for cleaning a table base supporting a chuck table holding the workpiece (see patent document 1).

Patent document 1: japanese laid-open patent publication No. 2004-37009

The arkansas abrasive tools are natural oilstones produced in arkansas in the united states. The aken color abrasive is a natural product, and therefore, is expensive and precious, and in addition, the properties tend to become uneven, and the individual difference is large. Therefore, there is a demand for a grinding stone that can be used as a substitute for an aken stone, and a high-quality grinding stone with less variation than the aken stone.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object thereof is to provide a novel method for producing a grinding wheel which can be used for grinding the surface of metal or ceramics, and a grinding wheel.

According to one aspect of the present invention, there is provided a method for manufacturing a grinding stone, comprising the steps of: a glass bead supply step of supplying glass beads to the mold frame; and a firing step of heating the mold frame containing the glass pellets at a temperature exceeding the softening point and lower than the melting point of the glass pellets to form a glass gob to be a grinding wheel, wherein in the firing step, heating is terminated in a state where bubbles remain dispersed in gaps between the glass pellets.

Preferably, the glass pellets are soda glass, feldspar or borosilicate glass.

Preferably, the surface roughness Ra of the glass block after the firing step is 0.2 to 1.5 μm, and the porosity is 2 to 8%.

More preferably, the firing step is performed for 1 hour or more and 2 hours or less.

In addition, according to another aspect of the present invention, there is provided a grinding stone for grinding a surface of metal or ceramic, comprising a glass block having a surface roughness Ra of 0.2 μm or more and 1.5 μm or less and a porosity of 2% or more and 8% or less.

Preferably, the abrasive article does not contain abrasive particles.

In a method for manufacturing a grinding stone according to an aspect of the present invention, glass particles are supplied to a mold frame, and a glass gob to be a grinding stone is formed by heating at a temperature exceeding a softening point and lower than a melting point of the glass particles. At this time, the heating is terminated in a state where the bubbles are dispersedly left in the gaps between the glass particles. Further, the abrasive tool according to one embodiment of the present invention has a uniform property and small individual variation in a state where pores are appropriately present. The grinding tool can be used for grinding the surfaces of metal and ceramics instead of an Ackeran grinding tool.

Therefore, according to one embodiment of the present invention, a novel method for producing a grinding wheel and a grinding wheel which can be used for grinding the surface of metal or ceramic are provided.

Drawings

Fig. 1 is a sectional view schematically showing a glass pellet providing step.

Fig. 2 is a sectional view schematically showing a firing step.

Fig. 3 (a) is a perspective view schematically showing an example of a grinding wheel, and fig. 3 (B) is a perspective view schematically showing another example of a grinding wheel.

Fig. 4 is a flowchart showing a flow of each step of the method of manufacturing the abrasive tool.

Description of the reference symbols

1: glass particles; 3. 5: grinding the abrasive tool; 3a, 5 a: a surface; 2: a container; 2 a: providing a port; 4: a mold frame; 6: a main body; 8: a storage section; 10: heating furnace; 12: an interior space; 14: a cover body.

Detailed Description

Embodiments of the present invention will be explained. The grinding tool manufactured by the method of manufacturing a grinding tool according to the present embodiment can be used as a substitute for an aken color grinding tool. Conventionally, an aken-colored grindstone has been used as a grinding grindstone for removing fine irregularities and fine protrusions called burrs, which are generated when the surface of metal or ceramic is machined, from the surface.

When polishing a processed surface of metal or ceramic, there is a demand for reliably removing fine irregularities or burrs on the surface, and on the other hand, there is a demand for preventing excessive wear or damage to the surface due to polishing. The aken grindstone is a relatively hard grindstone containing quartz as a main component, and on the other hand, the aken grindstone contains pores (bubbles) capable of appropriately holding oil (oil), water, and the like used as a lubricant during grinding, and is suitable for grinding the surface of metal or ceramics.

However, since the arkansas grinders are natural products, the reserves are limited and precious, and the quality tends to be uneven, and the individual difference tends to increase. Accordingly, there is a need for a synthetic abrasive article that can replace the aken abrasive article. However, it is not easy to manufacture a synthetic abrasive tool formed of a hard material but having good properties to properly disperse pores.

The method of manufacturing a grinding stone of the present embodiment can manufacture such a grinding stone having good properties. Hereinafter, each step of the manufacturing method will be described. Fig. 4 is a flowchart showing the flow of each step. In this manufacturing method, first, a glass particle supply step S10 of supplying glass particles to a mold frame is performed, and then, a firing step S20 of heating the mold frame to form a glass gob to be a grinding stone is performed.

Fig. 1 is a sectional view schematically showing the glass pellet providing step S10. Fig. 1 schematically shows a side view of a container 2 containing glass pellets 1 and a cross-sectional view of a mold frame 4, the glass pellets 1 being a raw material of a glass gob to be a grinding stone. The mold frame 4 has a main body 6 formed of ceramic or the like that can withstand the heating temperature in the firing step S20 described later. A concave housing portion 8 into which the glass particles 1 are put is provided at the center of the upper surface of the body 6. In the glass pellet supply step S10, glass pellets 1 are put into the storage section 8 from the supply port 2a of the container 2.

The glass pellets 1 put into the storage section 8 are fired at a high temperature to form a glass gob. The formed glass gob may be used as a grinding stone as it is, or may be formed into a predetermined shape and used as a grinding stone. The shape of the glass block reflects the shape of the housing portion 8. Therefore, when the glass gob is used as a grinding stone as it is, the mold frame 4 having the receiving portion 8 with a shape conforming to the shape of the grinding stone to be manufactured may be selected and used in the glass particle supply step S10.

The glass pellet 1 is made of soda glass, feldspar, borosilicate glass, or the like. In addition, glass pellets 1 can be usedGlass particles having a particle diameter of about one hundred microns. However, the particle diameter of a part of the glass particles 1 stored in the storage section 8 may be outside this range as long as the particle diameter of the main glass particles 1 satisfies this range.

For example, if the particle diameter of the main glass particles 1 is smaller thanHandling of the glass pellets 1 becomes difficult, and the glass pellets 1 are difficult to be accommodated in the accommodating portion 8 of the mold frame 4. On the other hand, if the main glass particles 1 have a particle size larger than thatIt is difficult to form pores that are properly dispersed in a proper size on the formed glass gob. For example, there are cases where: the pores in the glass gob are connected to each other, and when the object is polished, a lubricant such as oil or water supplied to the polishing abrasive tool permeates into the inside, and the lubricant cannot be sufficiently retained on the surface in contact with the object.

In the glass gob supplying step S10, the glass gobs 1 are supplied to the receiving portions 8 of the mold frame 4 by an amount corresponding to the volume to be formed. At this time, the mold frame 4 may be vibrated so as to spread the upper surface of the glass pellets 1 stored in the storage section 8 flat without leaving an excessive space. For example, the vibration may be applied to the mold frame 4 for less than 1 minute. The vibration is one of the factors contributing to the production of the homogeneous grinding stone.

After the glass pellet providing step S10, a firing step S20 is performed. Fig. 2 is a sectional view schematically showing the firing step S20. As shown in fig. 2, the mold frame 4 in which the glass pellets 1 are accommodated in the accommodating portion 8 is accommodated in the internal space 12 of the heating furnace 10 and heated. When the mold is stored in the heating furnace 10, a lid 14 for closing the storage section 8 of the mold frame 4 is placed on the upper portion of the mold frame 4. The lid 14 is made of, for example, the same material as the mold frame 4, and can withstand the heating temperature when the glass pellet 1 is fired.

The heating furnace 10 includes a heat source (not shown) such as an electric heating wire for heating the internal space 12 to a predetermined temperature. In the firing step S20, the mold frame 4 containing the glass pellets 1 is heated at a temperature exceeding the softening point and lower than the melting point of the glass pellets 1 to form a glass gob to be a grinding stone. Here, the softening point of the glass pellets 1 means a temperature at which the glass pellets 1 start to deform when the temperature is raised. The softening point differs depending on the properties such as the material and structure of the glass pellet 1, and is lower than the melting point.

In the firing step S20, when the glass pellet 1 is soda glass, the mold frame 4 is heated at a temperature higher than 720 ℃ and lower than 1000 ℃. When the glass pellet 1 is feldspar, the mold frame 4 is heated at a temperature higher than 900 ℃ and lower than 1350 ℃. In addition, when the glass pellet 1 is borosilicate glass, the mold frame 4 is heated at a temperature higher than 820 ℃ and lower than 1250 ℃.

In the firing step S20, the heating is terminated in a state where the bubbles remain dispersed in the gaps between the glass pellets 1. For example, if the temperature of the glass pellets 1 exceeds the melting point, the glass pellets 1 liquefy and the bubbles in the gaps between the glass pellets 1 disappear. In this case, even if the formed glass gob is used as a grinding wheel, the grinding wheel cannot hold a lubricant, and thus cannot appropriately grind the object to be ground.

Even when the temperature of the glass pellets 1 does not exceed the melting point, the bubbles between the glass pellets 1 disappear when the glass pellets 1 are exposed to a temperature higher than the softening point for a long period of time. Therefore, in the firing step S20, the glass pellets 1 are preferably heated for a time of 1 hour or more and 2 hours or less. When the firing step S20 is performed, a glass block that can be used as a grinding stone is formed. Then, the mold frame 4 is taken out of the heating furnace 10, and the glass gob is taken out of the mold frame 4.

Fig. 3 (a) is a perspective view schematically showing a grinding stone 3 made of a rectangular parallelepiped glass block, and fig. 3 (B) is a perspective view schematically showing a grinding stone 5 made of a disc-shaped glass block. In the method of manufacturing a grindstone of the present embodiment, the grindstone can be manufactured in a free shape by changing the shape of the housing portion 8 of the mold frame 4.

Here, when the surface roughness (Ra) of the surfaces 3a, 5a of the glass gobs (grinding stones 3, 5) after the firing step S20 was measured, it was 0.2 μm or more and 1.5 μm or less. That is, it can be understood that the surfaces 3a, 5a are very flat. In the method of manufacturing the abrasive tools according to the present embodiment, since abrasive grains are not mixed into the glass beads 1, abrasive tools 3 and 5 not containing abrasive grains can be obtained. Therefore, the flatness of the surfaces 3a and 5a is extremely high, and even if the surfaces of the metal and ceramic are polished by the polishing grindstones 3 and 5, the surfaces to be polished are not damaged such as scratches.

The porosity of the produced grindstone 3, 5 is set to 2% or more and 8% or less. Here, the porosity is a volume ratio of pores in the total volume of the grinding stones 3 and 5. If the porosity of the grinding stones 3 and 5 is less than 2%, it is difficult to appropriately retain the oil as the lubricant. On the other hand, if the porosity exceeds 8%, pores are connected to each other, and the lubricant easily penetrates into the inside of the grindstone 3, 5, and the required amount of oil is less likely to remain on the surface.

If the porosity is too high and many pores are exposed on the surfaces 3a and 5a of the grindstones 3 and 5, burrs or the like generated on the surfaces of the objects to be ground are likely to contact the pores. When burrs or the like come into contact with the pores, the object to be polished is likely to be damaged by chipping or the like at the part. Therefore, if the number of pores is too large, the machining quality is deteriorated.

In the method of manufacturing the grinding stone of the present embodiment, after the firing step S20 is performed, a grinding step of grinding the surface of the formed glass gob may be further performed in order to further improve the flatness of the surface. The surfaces 3a, 5a may be appropriately polished in order to ensure flatness required according to the application of the manufactured abrasive tools 3, 5.

After the firing step S20 is performed, a shaping step of shaping the glass gob into a grinding wheel having a predetermined shape may be performed. In the shaping step, the glass gob is shaped by, for example, cutting the glass gob with an annular cutting tool or grinding with a disk-shaped grinding wheel. Thus, grinding stones of various shapes according to the application can be manufactured.

When an object to be polished such as metal or ceramic is polished using the manufactured polishing abrasive, generated machining chips and the like sometimes accumulate on the surface of the polishing abrasive and cause clogging. In this case, the surface of the grinding wheel is polished and ground to remove the clogged portion and expose a new surface, thereby recovering the grinding ability of the grinding wheel.

As described above, according to the method for manufacturing a grinding stone of the present embodiment, the grinding stones 3 and 5 that can be used as substitutes for the rankine grinding stones can be manufactured. The resulting grindstone 3, 5 has a high surface flatness and an appropriate porosity, and therefore can be suitably used for grinding the surface of a processed metal or ceramic.

Further, the produced grinding stones 3 and 5 are homogeneous unlike the natural product, i.e., the aken color grinding stones, and the variation in individual difference is small. In particular, when soda glass is used for the glass beads 1 supplied to the mold frame 4 in the glass bead supply step, the heating temperature of the mold frame 4 in the firing step S20 can be kept relatively low, and therefore the grinding stones 3 and 5 can be easily and inexpensively manufactured, and the properties are more stable.

In the above embodiment, the case where the grinding stones 3 and 5 are used for grinding the surface of metal or ceramic has been described, but one embodiment of the present invention is not limited to this. That is, the grinding stones 3, 5 may be used for other purposes.

In the above embodiment, the case where the vibration is applied to the frame in the glass pellet supply step S10 to remove the bubbles and spread the upper surfaces of the glass pellets 1 flat has been described, but one embodiment of the present invention is not limited to this. For example, the upper surface of the glass pellet 1 may be spread flat by another method, or may be spread by a jig having a flat shape.

The structure, method, and the like of the above embodiments can be modified as appropriate without departing from the scope of the object of the present invention.