阅读说明：本技术 一种研磨砂轮 (Grinding wheel ) 是由 陈兴松 郑秉胄 赵晟佑 于 2019-11-06 设计创作，主要内容包括：本发明提供一种研磨砂轮,包括：环形基体；位于所述环形基体一端面的至少两圈砂轮齿,所述砂轮齿的底端通过粘接剂与所述环形基体固定连接,位于外圈的所述砂轮齿开设有贯穿其底端和顶端的排水孔,所述排水孔与所述环形基体内的排水通道相连通。根据本发明实施例的研磨砂轮,通过将砂轮齿直接固定在所述环形基体端面,无需在环形基体端面上开设沟槽,从而避免了砂轮齿嵌入沟槽部分无法使用的情况的发生,提高了砂轮齿的利用率,降低了生产加工成本；而且,由于在部分砂轮齿内开设了排水孔,增强了环形基体端面的冷却效果,使得设置两圈或多圈砂轮齿时同样满足冷却需求。(The invention provides a grinding wheel, comprising: an annular base; the grinding wheel teeth are positioned on one end face of the annular base body, the bottom ends of the grinding wheel teeth are fixedly connected with the annular base body through an adhesive, drain holes penetrating through the bottom end and the top end of the grinding wheel teeth are formed in the outer ring of the grinding wheel teeth, and the drain holes are communicated with a drain channel in the annular base body. According to the grinding wheel provided by the embodiment of the invention, the grinding wheel teeth are directly fixed on the end face of the annular base body, and a groove does not need to be formed on the end face of the annular base body, so that the condition that the grinding wheel teeth are embedded into the groove and cannot be used is avoided, the utilization rate of the grinding wheel teeth is improved, and the production and processing cost is reduced; moreover, as the water drain holes are formed in part of the grinding wheel teeth, the cooling effect of the end face of the annular base body is enhanced, and the cooling requirement is met when two or more circles of grinding wheel teeth are arranged.)

1. A grinding wheel, comprising:

an annular base;

the grinding wheel teeth are positioned on one end face of the annular base body, the bottom ends of the grinding wheel teeth are fixedly connected with the end face of the annular base body through an adhesive, drain holes penetrating through the bottom end and the top end of the grinding wheel teeth are formed in the outer ring of the grinding wheel teeth, and the drain holes are communicated with a drain channel in the annular base body.

2. A grinding wheel according to claim 1, characterized in that the roughness of the end face of the annular base body on which the grinding wheel teeth are located is in the range of 1.6 to 800 μm.

3. A grinding wheel according to claim 1, characterized in that the cross-sectional area of the grinding wheel teeth decreases from the bottom end of the grinding wheel teeth to the top end of the grinding wheel teeth.

4. A grinding wheel according to claim 3, characterized in that the cross-sectional shape of said grinding wheel teeth on the outer ring may be a combined pattern formed by an arbitrary plane closed pattern and a circle inside said plane closed pattern.

5. A grinding wheel according to claim 4, characterized in that said planar closed figure comprises: circular, elliptical, and polygonal.

6. A grinding wheel according to claim 4, wherein each of said grinding wheel teeth in the same circle are spaced apart and the shape of adjacent grinding wheel teeth differs from each other.

7. A grinding wheel according to claim 5, wherein the planar closed figure is an ellipse or a polygon, and an included angle between a line connecting two points closest and farthest to the center of circle of the grinding wheel tooth in the contour line of the end face at the bottom end of the grinding wheel tooth and a line connecting the center of circle of the grinding wheel tooth and the point closest to the center of circle of the grinding wheel tooth is in a range of 0 to 90 °.

8. A grinding wheel according to claim 1, further comprising:

and at least two circles of water drainage outer holes are formed in the end face of the annular base body where the grinding wheel teeth are located, and the water drainage outer holes and the grinding wheel teeth are alternately distributed in the radius direction of the annular base body.

9. A grinding wheel according to claim 1, characterized in that the mass of each of said grinding wheel teeth in the same circle is the same.

10. A grinding wheel according to claim 1, wherein said annular base is made of an aluminum alloy material and said grinding wheel teeth are made of a diamond material.

Technical Field

The invention relates to the technical field of silicon wafer processing, in particular to a grinding wheel.

Background

At present, the grinding wheel is widely applied to a grinding process and a thinning process in silicon wafer forming processing, and mainly comprises a table metal and grinding teeth, wherein grooves are formed in the surface of the table metal and used for mounting the grinding teeth, the height of the grinding teeth is generally 4mm, 5mm and 7mm, and the grinding teeth are partially embedded in the grooves, and the depth of the grooves is generally 1mm, so that the height of the final actually-used part of the grinding teeth is reduced. In the process of edge grinding of the silicon wafer, the grinding wheel is a main consumable, which is mainly reflected in the abrasion consumption of the grinding teeth, but the grinding teeth are expensive and high in manufacturing cost, so that the processing cost of the silicon wafer is increased. In addition, the existing grinding wheel is limited by the cooling and chip removal capacity, the grinding teeth on the grinding wheel are usually only one circle, and the machining efficiency is low.

Disclosure of Invention

In view of the above, the present invention provides a grinding wheel, which is used to solve the problems of increased production and processing costs and low grinding wheel processing efficiency caused by low utilization rate of grinding teeth.

In order to solve the technical problems, the invention adopts the following technical scheme:

the embodiment of the invention provides a grinding wheel, which comprises:

an annular base;

the grinding wheel teeth are positioned on one end face of the annular base body, the bottom ends of the grinding wheel teeth are fixedly connected with the end face of the annular base body through an adhesive, drain holes penetrating through the bottom end and the top end of the grinding wheel teeth are formed in the outer ring of the grinding wheel teeth, and the drain holes are communicated with a drain channel in the annular base body.

Optionally, the roughness range of the end face of the annular substrate where the grinding wheel teeth are located is 1.6-800 μm.

Optionally, the cross-sectional area of the grinding gear teeth gradually decreases from the bottom end of the grinding gear teeth to the top end of the grinding gear teeth.

Alternatively, the cross-sectional shape of the grinding wheel teeth on the outer ring can be a combined pattern formed by any plane closed pattern and a circle positioned inside the plane closed pattern.

Optionally, the planar closed figure includes: circular, elliptical, and polygonal.

Optionally, each of the grinding wheel teeth in the same circle is arranged at intervals, and the shapes of two adjacent grinding wheel teeth are different from each other.

Optionally, the planar closed figure is an ellipse or a polygon, and an included angle formed by a connecting line between two points of the contour line of the end face of the bottom end of the grinding wheel tooth, which are closest and farthest to the circle center of the circle where the grinding wheel tooth is located, and a connecting line between the circle center of the circle where the grinding wheel tooth is located and a point of the circle where the grinding wheel tooth is located, which is closest to the circle center of the circle where the grinding wheel tooth is located, is in a range of 0 to 90 °.

Optionally, the grinding wheel further comprises:

and at least two circles of water drainage outer holes are formed in the end face of the annular base body where the grinding wheel teeth are located, and the water drainage outer holes and the grinding wheel teeth are alternately distributed in the radius direction of the annular base body.

Optionally, the mass of each of the grinding wheel teeth in the same circle is the same.

Optionally, the annular substrate is made of an aluminum alloy material, and the grinding wheel teeth are made of a diamond material.

The technical scheme of the invention has the following beneficial effects:

according to the grinding wheel provided by the embodiment of the invention, the grinding wheel teeth are directly fixed on the end face of the annular base body, and a groove does not need to be formed on the end face of the annular base body, so that the condition that the grinding wheel teeth are embedded into the groove and cannot be used is avoided, the utilization rate of the grinding wheel teeth is improved, and the production and processing cost is reduced; moreover, as the water drain holes are formed in part of the grinding wheel teeth, the cooling effect of the end face of the annular base body is enhanced, and the cooling requirement is met when two or more circles of grinding wheel teeth are arranged.

Drawings

FIG. 1 is a schematic view of a prior art grinding wheel;

FIG. 2 is a schematic structural diagram of a silicon wafer thinning grinding wheel according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of the location of the grinding wheel teeth and the annular base of the silicon wafer thinning grinding wheel in an embodiment of the invention;

FIG. 4 is a schematic cross-sectional view of a grinding wheel tooth according to an embodiment of the present invention;

FIG. 5 is a second schematic cross-sectional view of a grinding wheel tooth according to an embodiment of the present invention;

FIG. 6 is a third schematic cross-sectional view of a grinding wheel tooth according to an embodiment of the present invention;

FIG. 7 is a fourth schematic sectional view of a grinding wheel tooth according to an embodiment of the present invention;

FIG. 8 is a fifth schematic sectional view of a grinding wheel tooth according to an embodiment of the present invention;

FIG. 9 is a sixth schematic sectional view of a grinding wheel tooth according to an embodiment of the present invention;

FIG. 10 is a seventh schematic cross-sectional view of a grinding wheel tooth according to an embodiment of the present invention;

FIG. 11 is an eighth schematic cross-sectional view of a grinding wheel tooth in accordance with an embodiment of the present invention;

FIG. 12 is a ninth schematic view of the cross-sectional shape of the grinding wheel tooth according to the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a grinding wheel in the prior art. As shown in fig. 1, the prior art grinding wheel includes a table 11 and a grinding tooth 12, wherein, a plurality of grooves are opened on the mounting surface of the table 11, and the shape of the grooves is consistent with the shape of the grinding tooth 12, so as to insert the grinding tooth 12 into the grooves; since the grinding wheel is rotated at a high speed by the spindle to rub the surface of the silicon wafer, the grooves are required to have a certain depth in order to ensure that the grinding teeth 12 are firmly and stably fixed on the table metal 11, but the grinding teeth 12 themselves have a limited length, and after a part of the length is embedded in the grooves, the remaining usable length is reduced, thereby reducing the utilization rate of the grinding teeth 12. In the process of grinding and machining the silicon wafer, the grinding wheel is a main consumable, which is mainly reflected in the abrasion consumption of the grinding teeth 12, but the manufacturing cost of the grinding wheel is high, and under the condition that the partial length in the groove cannot be used, the consumption of the grinding wheel is increased, so that the cost of grinding and machining the silicon wafer is increased; moreover, each grinding tooth 12 is manually bonded on the table metal 11, and the distance between adjacent grinding teeth 12 has a certain difference, which causes the grinding wheel to run to generate vibration, thus affecting the grinding effect; in addition, since the conventional grinding tooth 12 has a single shape, usually only a circular or circular arc shape, and the shape directly affects the powder discharge effect generated during grinding, the surface quality of the silicon wafer after grinding is reduced, the silicon wafer has the disadvantages of high surface roughness, deep damaged layer, grinding marks and the like, and abnormal consumption of the grinding tooth 12 is further caused by untimely discharge of the grinding powder and uneven distribution of cooling water. On the other hand, the prior art has few drain holes, which is limited by the cooling efficiency and the drainage and chip removal efficiency, and generally only one circle of grinding teeth 12 can be arranged, which leads to the limitation of the processing efficiency of the grinding wheel and affects the improvement of the yield.

Therefore, the embodiment of the invention provides a grinding wheel to solve the above defects of the existing grinding wheel.

As shown in fig. 2 and 3, the grinding wheel in the embodiment of the present invention includes an annular base 21 and at least two circles of grinding wheel teeth 22, wherein the annular base 21 is annular and has a certain thickness, the two circles of grinding wheel teeth 22 are located on an end surface of the annular base 21, that is, an end surface perpendicular to a central axis of the annular base 21, the grinding wheel teeth 22 in each circle of grinding wheel teeth 22 are arranged at intervals, a center of the circle coincides with a center of the end surface, and the two circles of grinding wheel teeth 22 are arranged concentrically. Different from the prior art, the grinding wheel tooth 22 in the embodiment of the invention is directly fixed with one end face of the annular base body 21 through the adhesive, and a groove does not need to be formed on the end face of the annular base body 21, so that the condition that the grinding wheel tooth 22 is partially embedded into the groove is avoided, the utilization rate of the grinding wheel tooth 22 is improved, the consumption of the grinding wheel is greatly reduced, and the production and processing cost is reduced.

In the embodiment of the invention, because the grinding wheel teeth 22 are directly fixed to one end face of the annular base 21 through the adhesive, in order to improve the firmness and stability of connection between the grinding wheel teeth and the annular base 21, the roughness range of the end face of the annular base 21 for arranging the grinding wheel teeth 22 is 1.6-800 μm, that is, the roughness of the end face of the annular base 21 is increased, so that the resistance between the annular base 21 and the grinding wheel teeth 22 is increased, the grinding wheel teeth 22 are more firmly bonded and fixed on the annular base 21, the phenomenon that the grinding wheel teeth 22 fall off in the using process is avoided, and the roughness range of the end face can be adjusted according to the actual rotating speed and the application of the grinding wheel. In some embodiments of the present invention, the roughness of the end surface of the annular substrate 21 may be controlled by grinding with a grinding wheel or by embossing.

In the embodiment of the present invention, in order to further improve the structural strength and the bonding strength of the grinding wheel teeth 22, the cross-sectional area of the grinding wheel teeth 22 may be gradually reduced from one end connected to the annular base 21 to the other end, that is, one end surface contacting the annular base 21 is larger, and the other end away from the annular base 21 is smaller, and by providing the grinding wheel teeth 22 in such a shape, the purpose of enhancing the structural strength and the bonding strength of the grinding wheel teeth 22 can be achieved.

As shown in fig. 4-10, in some embodiments of the present invention, the cross-sectional shape of the grinding wheel tooth 22 may be any planar closed figure shape, such as a regular shape figure like a circle, an ellipse, a polygon, etc., or some irregular planar closed figure, such as a crescent, where the polygon may be a triangle, a quadrangle, a pentagon, a hexagon, etc., and the shape of the grinding wheel tooth 22 may be selected according to the actual application requirement. Further, a chamfer or the like may be formed at the upper end of the grinding wheel tooth 22 to change the shape of the tooth so that the tooth more conforms to the fluid mechanics principle, thereby facilitating the discharge of the grinding powder and the cooling water to enhance the cooling effect and the chip removal effect. The grinding wheel teeth 22 of the same circle may be formed by arranging the grinding wheel teeth 22 of a single shape at intervals, or formed by arranging the grinding wheel teeth 22 of two shapes at intervals, or formed by arranging the grinding wheel teeth 22 of various shapes at intervals, and the grinding wheel teeth 22 of different circles may be identical or different in shape.

Because the grinding wheel in the embodiment of the invention is provided with at least two circles of grinding wheel teeth 22, the grinding machining efficiency is higher, and the yield is improved. Of course, correspondingly, the heat generation rate of the grinding wheel and the generation rate of the grinding powder in unit time are also increased, so that abnormal temperature rise is caused, and the powder cannot be discharged in time, thereby affecting the grinding quality. Therefore, in other embodiments of the present invention, the grinding wheel further includes at least two circles of water drainage external holes 23, each water drainage external hole 23 in the same circle is arranged at an interval, the center of each circle of water drainage external holes 23 is the same as the center of the circle of the grinding wheel teeth 22, the water drainage external holes 23 and the grinding wheel teeth 22 are arranged at intervals along the radial direction of the end surface of the annular substrate 21, for example, the innermost circle is a circle of water drainage external holes 23, then a circle of grinding wheel teeth 22 is arranged outside the circle of water drainage external holes 23, then a second circle of water drainage external holes 23 is arranged outside the circle of grinding wheel teeth 22, and finally a second circle of grinding wheel teeth 22 is arranged outside the second circle of water drainage external holes 23. Further, each water discharge outer hole 23 is communicated with a water injection channel connected with the inside of the annular base body 21 and used for injecting cooling water into the grinding surface through each water discharge outer hole 23, the cooling water is thrown out under the high-speed rotation of the grinding wheel under the centrifugal action, so that the cooling water acts on the grinding wheel teeth 22, the grinding wheel teeth 22 can be cooled on one hand, powder generated by grinding can be quickly washed away on the other hand, and the influence on heat dissipation or damage to the grinding surface of the silicon wafer is avoided. Of course, the number of turns of the drainage outer hole 23 can be adjusted, for example, it can be one turn, or two or more turns, and in the case that the grinding wheel tooth 22 has two or more turns, the number of turns of the drainage hole 23 can be increased appropriately to meet the requirements of cooling and chip removal.

As shown in fig. 11 and 12, in the embodiment of the present invention, in order to further enhance the cooling effect and the drainage and chip removal effect, so as to make it possible to arrange two rows of grinding wheel teeth 22 at the same time, the grinding wheel teeth 22 located on the outer ring are provided with drainage holes 221 penetrating through the bottom end and the top end thereof, and the drainage holes 221 are communicated with a drainage channel in the annular base body 21 so as to convey cooling water to the grinding part through the drainage holes 221. That is, the cross-sectional shape of the grinding wheel tooth 22 of the outer ring may be a combination of any planar closed pattern and a circle located inside the planar closed pattern, for example, a circle and a circle in the enclosed area thereof, an ellipse and a circle in the enclosed area thereof, a rounded rectangle and a circle in the enclosed area thereof, and the like, and of course, the shape of the drain hole 221 is not limited to a circle in practice, and may be an ellipse, a square, and the like. By means of the design, under the condition that the end face area of the annular base body 21 is not occupied additionally, a circle of the water drainage holes 221 is added, and therefore the cooling effect and the water and chip drainage effect are guaranteed.

In some embodiments of the present invention, the cross-sectional shape of the outer ring grinding wheel teeth 22 is a combination of a rounded rectangle and a circle inside the rounded rectangle, and the cross-sectional shape of the inner ring grinding wheel teeth 22 is an ellipse, which have good drainage and chip removal effects; furthermore, the range of the included angle formed by the connecting line between the two points which are closest to and farthest from the circle center of the circle where the grinding wheel tooth 22 is located in the contour line of the end face of the bottom end of the grinding wheel tooth 22 and the connecting line between the circle center of the circle where the grinding wheel tooth 22 is located and the point closest to the circle center is 0-90 degrees. That is, the end face of the grinding wheel tooth 22 is a planar closed figure, a connecting line between two points of the contour line closest to and farthest from the circle center of the circle in which the grinding wheel tooth 22 is located is called a first straight line, a connecting line between the circle center of the circle in which the grinding wheel tooth 22 is located and a point of the end face contour line closest to the circle center is called a second straight line, and an included angle formed between the first straight line and the second straight line is 0-90 °. In short, different from the prior art in which the grinding teeth are arranged in a closed manner, the grinding wheel teeth 22 in the present embodiment are arranged in an open manner, that is, the grinding wheel teeth 22 and the circle in which the grinding wheel teeth are arranged form a certain inclination angle, that is, the inclination direction of the grinding wheel teeth is basically the same as the track direction of the centrifugal motion performed by the circle center of the circle; by adopting the inclined arrangement mode, when the grinding wheel rotates at a high speed, cooling water flowing out of the water discharge hole 23 and the water discharge outer hole 221, grinding powder generated by processing and the like are quickly thrown out along the inclined direction of the grinding wheel teeth 22, so that the water and chip discharge effect is further improved.

In some embodiments of the present invention, although the shape of the grinding wheel teeth 22 may be different, the mass of each grinding wheel tooth 22 may be controlled to be almost the same, and when the grinding wheel teeth 22 with the same mass are distributed at intervals on the end surface of the annular base 21, the grinding wheel may be kept smooth at high speed, and a certain deviation due to unbalanced mass distribution may not be generated, thereby ensuring the quality of grinding.

In other embodiments of the present invention, the annular base 21 may be made of an aluminum alloy material, and the grinding wheel teeth 22 may be made of a diamond material, so that the structural strength of the formed grinding wheel teeth 22 can meet the requirements.

According to the grinding wheel provided by the embodiment of the invention, the grinding wheel teeth are directly fixed on the end face of the annular base body, and a groove does not need to be formed on the end face of the annular base body, so that the condition that the grinding wheel teeth are embedded into the groove and cannot be used is avoided, the utilization rate of the grinding wheel teeth is improved, and the production and processing cost is reduced; moreover, as the water drain holes are formed in part of the grinding wheel teeth, the cooling effect of the end face of the annular base body is enhanced, and the cooling requirement is met when two or more circles of grinding wheel teeth are arranged.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.