JP4326487B2 - Lap wheel - Google Patents

Description

  The present invention relates to a lap wheel used for grinding glass, ceramic and the like.

Lap wheels are used for precision grinding of glass, ceramics, and the like. Lapping is performed for the purpose of removing irregularities and unnecessary layers on the surface of a work material by a surface plate using a grinding liquid containing a grinding material. Among the lapping methods, in double-sided lapping, the workpiece is stored on a plate called a carrier made of a resin having holes that can store the workpiece, and this carrier is placed between two surface plates, Generally, free abrasive lapping is used to polish the surface of the workpiece by supplying a slurry containing fine powder such as alumina between two surface plates and rotating the two surface plates in the opposite direction. It is.
However, in the lapping process of loose abrasive grains, the work efficiency is low because the workpieces are scraped while rolling the abrasive grains. In recent years, fixed abrasive lapping wheels in which diamond abrasive grains are held by a binder are used. It has become.

As a technique related to this fixed abrasive lapping, there is one described in Patent Document 1, and its structure is shown in FIG. This metal bond wrap wheel is formed by arranging round chips 21 containing diamond on a base metal 22, and since the processing pressure is effectively transmitted to the cutting edge of the diamond and bites into the work material, the holding force is increased. It is said that it is high and can maintain a high elastic modulus.
In addition, Patent Document 2 describes a lap wheel for the purpose of preventing scattering of a grinding liquid supplied during grinding, and Patent Document 3 describes a superabrasive layer on the innermost and outer periphery of a grinding surface. A lap wheel is described that aims to suppress uneven wear of the workpiece and to improve the stability of the workpiece during grinding.

Japanese Patent No. 1897573 Japanese Utility Model Publication No. 61-141071 JP-A-11-165254

However, as described in Patent Document 1, when the round chips 21 are arranged, the grinding fluid escapes from the processing surface of the wheel, the grinding fluid is not sufficiently supplied to the abrasive layer, and the processing efficiency decreases. .
This is shown in FIG. In FIG. 5, the lap wheel 12 is disposed so as to sandwich the work material 11 from above and below, and grinding is performed, and the grinding liquid is supplied onto the grinding surface of the lap wheel 12 through the grinding liquid supply hole 13. Although the grinding fluid is sufficiently supplied on the upper surface side of the work material 11, the grinding fluid flows out on the lower surface side of the work material 11 without being pooled. Therefore, on the lower surface side of the work material 11, the abrasive grains 14 are easily worn out and the chip discharging ability is low, so that the sharpness is lowered.
In addition, the lap wheels described in Patent Document 2 and Patent Document 3 have a structure in which a plate is provided on the outer periphery. There is no, and chips are easily clogged during grinding.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lap wheel capable of sufficiently supplying a grinding liquid to abrasive grains and improving processing efficiency. To do.

In order to solve the above-described problems, the present invention provides a fan-shaped abrasive grain layer formed on a disk-shaped base metal, and a groove is provided between the abrasive grain layers. The wrap wheel is characterized in that a damming member using an epoxy resin, a silicon sealant, or a metal chip is disposed at the outer peripheral end.
Grooves are provided between the abrasive layers, and the weiring members are arranged at the inner and outer peripheral ends of the grooves, so that the grinding liquid can stay in the grooves and grind to the abrasive grains during grinding. Since the liquid is sufficiently supplied, the sharpness can be maintained in a good state.

In the present invention, the length of the damming member in the radial direction is preferably 2 mm or more and 10 mm or less.
If the length of the damming member in the radial direction is less than 2 mm, the area of the damming member is small, so that sufficient contact strength with the base metal cannot be ensured, and the damming member is in the middle of grinding. There is a risk of peeling from the surface, which is not preferable. Further, if the length of the weir member in the radial direction exceeds 10 mm, the length of the groove for retaining the grinding fluid becomes short, and the grinding fluid cannot be sufficiently retained.

In the present invention, the circumferential width of the groove is preferably 4 mm or more and 10 mm or less.
When the circumferential width of the groove is less than 4 mm, the width of the groove becomes too small to sufficiently retain the grinding fluid. In addition, if the width of the groove in the circumferential direction exceeds 10 mm, the work material tends to fall into the groove, which is not preferable.

In the present invention, the groove is provided with a hole penetrating the base metal.
By providing this hole, it is possible to effectively discharge sludge and abrasive grains that tend to accumulate in the groove during grinding without hindering the function of accumulating the grinding fluid.

  According to the present invention, since the grinding fluid can be sufficiently supplied to the abrasive grains, it is possible to realize a lap wheel capable of improving the processing efficiency.

Below, this invention is demonstrated based on the embodiment.
FIG. 1 shows a lap wheel according to an embodiment of the present invention. FIG. 1A is a plan view of the lap wheel, and FIG. 1B is a side view thereof.

  This lap wheel is formed by forming a plurality of fan-shaped abrasive grain layers 2 on a disk-shaped base metal 1 and providing grooves 3 for storing a grinding liquid between the abrasive grain layers 2. There are damming members 4 at the inner and outer peripheral ends of the groove 3 for preventing the grinding fluid from leaking. Since the weir member 4 needs to be worn in the same manner as the abrasive grain layer 2 during grinding, it is desirable to use a material with good receding property. For example, an epoxy resin, a silicon sealant, or a metal chip can be used.

  The length W of the abrasive grain layer 2 in the radial direction is 80 mm to 400 mm, while the length D of the weir member 4 is 2 mm or more and 10 mm or less. The circumferential width A of the groove 3 is 4 mm or more and 10 mm or less, and the depth B of the groove 3 is the same as the thickness of the abrasive grain layer 2.

The flow of the grinding fluid when grinding using this lap wheel will be described with reference to FIG.
In FIG. 2, the lap wheel 12 is disposed so as to sandwich the work material 11 from above and below, and grinding is performed. The grinding liquid is supplied onto the grinding surface of the lap wheel 12 through the grinding liquid supply hole 13. In the lap wheel 12 on the lower surface side of the work material 11, the grinding liquid is retained by the groove and the weir member. Since the rotation speed of the lap wheel 12 is relatively slow, the grinding fluid tends to stay on the lower surface side of the work material 11. Therefore, not only the grinding liquid is supplied on the upper surface side of the work material 11, but also the grinding liquid is sufficiently supplied to the abrasive grains 14 on the lower surface side of the work material 11 to maintain a good sharpness. Can do.

FIG. 3 shows a lap wheel according to another embodiment of the present invention. FIG. 3A is a plan view of the wrap wheel, and FIG. 3B is a side view thereof.
In FIG. 3, the lap wheel has a plurality of fan-shaped abrasive grain layers 2 formed on a disk-shaped base metal 1, and grooves 3 are provided between the abrasive grain layers 2 to store the grinding fluid. It is the same as that shown in FIG. 1 that the damming members 4 for preventing the grinding fluid from leaking are arranged at the inner and outer peripheral ends of the groove 3, A hole 15 penetrating through the base metal 1 is provided at the position of the groove 3 in order to discharge sludge and the like. Since the diameter of the hole 15 is as thin as about 3 mm, sludge and abrasive grains that tend to collect in the groove 3 during grinding can be effectively discharged without impeding the function of storing the grinding fluid.

Specific production examples and test examples are shown below.
A lap wheel having the structure shown in FIG. 1 was produced (Example), and a grinding test was performed together with the conventional example. Table 1 shows the test conditions.

  The test results are shown in Table 2.

  As described above, in the embodiment, the grinding liquid can be sufficiently supplied to both the upper surface side and the lower surface side of the work material, so that it is possible to perform grinding at a higher processing speed than the conventional example.

  FIG. 6 shows the processing speed when the length of the damming member in the radial direction is changed. When the length of the damming member is 2 mm or more and 10 mm or less, the processing speed can be increased to 9.3 μm / min, whereas the length of the damming member in the radial direction is 10 mm. When it exceeds 15 mm, the processing speed is as small as 6.8 μm / min.

  FIG. 7 shows the processing speed when the circumferential width of the groove is changed. When the circumferential width of the groove is 4 mm or more and 10 mm or less, the processing speed can be increased to 9.3 μm / min, whereas when the length of the weiring member in the radial direction is 3 mm The processing speed is as small as 6.7 μm / min.

  INDUSTRIAL APPLICABILITY The present invention can be used as a lap wheel that can sufficiently supply a grinding fluid to abrasive grains and can improve processing efficiency.

It is a figure which shows the structure of the lap wheel which concerns on embodiment of this invention. It is a figure which shows the flow of a grinding fluid when grinding using the lap wheel of this invention. It is a figure which shows the structure of the lap | wheel wheel which concerns on other embodiment of this invention. It is a figure which shows the structure of the conventional lap wheel. It is a figure which shows the flow of a grinding fluid when grinding using the conventional lap wheel. It is a figure which shows the processing speed when the length of the radial direction of a dam member is changed. It is a figure which shows the processing speed when changing the width | variety of the circumferential direction of a groove | channel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base metal 2 Abrasive grain layer 3 Groove 4 Damping member 11 Work material 12 Lap wheel 13 Grinding fluid supply hole 14 Abrasive grain

Claims (4)

A fan-shaped abrasive layer is formed on a disk-shaped base metal, and a groove is provided between the abrasive layers, and an epoxy resin, a silicon sealant, or A wrap wheel in which a damming member using a metal chip is arranged.   The lap wheel according to claim 1, wherein a length of the damming member in a radial direction is 2 mm or more and 10 mm or less.   The lap wheel according to claim 1 or 2, wherein a width of the groove in a circumferential direction is 4 mm or more and 10 mm or less.   The lap wheel according to any one of claims 1 to 3, wherein a hole penetrating the base metal is provided at the position of the groove.

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