JPH05318297A - Multi-stage grinding wheel - Google Patents

Abstract

PURPOSE:To provide a grinding wheel for specular grinding which can make high precision plane grinding quickly, efficiently. with less labor, and using a simple constitution by decreasing the number of processes in processing and enhancing the working effectiveness. CONSTITUTION:A multi-stage grinding wheel structure comprises a wheel spindle stock 2 coupled with a rotating means, the first grinding wheel 3 secured to the spindle stock 2 coaxially with the rotational axis C of the spindle stock 2, and the second grinding wheel 4 secured coaxially to the inside of the first grinding wheel 3 while protruding a certain amount thereto on its grinding surface side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding machine structure using a grindstone for grinding brittle materials such as fine ceramics and glass.

[0002]

2. Description of the Related Art In the case of mirror-grinding fine ceramics or glass using superabrasive grains, conventionally, for example, in traverse creep feed grinding, while rotating a cup-shaped grindstone to which a grindstone material is adhered Material)
The surface grinding of the feed workpiece was performed in a fixed direction while pressing it against the machined surface with a constant depth of cut (grinding allowance). In this case, in order to perform flat machining with high machining accuracy, grindstones with different grain sizes are used for each machining process, from rough machining to final finishing, and super-abrasive grains with smaller grain sizes are used in order. In the process, finishing processing was performed using superabrasive grains having a grain size of about 5 to 20 μm to form an optical mirror surface on the work.

[0003]

However, in the above-mentioned conventional mirror-surface grinding, the grinding process is divided into several steps in order to obtain a highly accurate machined surface, and grinding is performed while changing the grindstone for each step. It takes time and labor to attach and detach the grindstone when exchanging the grindstone and to adjust the depth of cut. Especially, in the finishing process, the depth of cut is 0.1 to 1 per feeding process.
Since it was possible to obtain only about μm, the efficiency of the grinding work was very poor.

The present invention has been made in view of the above-mentioned drawbacks of the prior art. The present invention reduces the number of processing steps to improve work efficiency, and has a simple structure to perform high-precision flat surface processing in a short time without trouble. An object of the present invention is to provide a grindstone for mirror grinding that can be efficiently performed.

[0005]

To achieve the above object, in a grindstone structure according to the present invention, a grindstone base connected to a rotating means and fixed to the grindstone mount coaxially with a rotating shaft of the grindstone mount. A ring-shaped first grindstone and a ring-shaped second grindstone that is coaxially fixed to the inside of the first grindstone by projecting a predetermined amount toward the grinding surface side with respect to the first grindstone. It has a multi-step grindstone structure.

In a preferred embodiment, the first and second grindstones are directly bonded to the grindstone base.

In another preferred embodiment, the first
The second grindstone and the second grindstone are joined to different support rings, and each support ring is fixed to the grindstone base.

In still another preferred embodiment, a plurality of grindstones including the first and second grindstones are joined to different support rings, and each support ring is coaxially arranged on the grindstone base. Between the adjacent support rings, the inner support ring is pressed to the grindstone side by the outer support ring, and only the outermost support ring is fixed to the grindstone base using the fixing means.

In yet another preferred embodiment, the first grindstone is composed of superabrasive grains having a large grain size for rough grinding, and the second grindstone is composed of superabrasive grains having a small grain size for finishing.

[0010]

Function: While the grindstone is rotating, the work is pressed against the work by a predetermined depth and is fed in a fixed direction along the work surface. As a result, the outer first grindstone grinds the work. Subsequently, the inner second grindstone protruding toward the work side by a predetermined amount from the first grindstone further grinds the work surface ground by the first grindstone by a predetermined amount. If the first grindstone is composed of roughening abrasive grains and the second grindstone is composed of finishing abrasive grains, roughing and finishing are simultaneously performed by one grinding feed.

[0011]

FIG. 1 is a sectional view showing the basic structure of a multi-step grindstone according to an embodiment of the present invention. This figure shows a state in which the multi-step grindstone 10 is grinding the workpiece 1 while rotating. The multi-step grindstone 10 includes a grindstone base 2 made of a metal material having a rotation axis C, a ring-shaped first grindstone 3 fixed to the grindstone base 2 coaxially with the rotary axis C, and the first grindstone 3 And a ring-shaped second grindstone 4 which is coaxially fixed to the inside. The second grindstone 4 is projected from the first grindstone 3 toward the grinding surface by a predetermined amount. The protrusion amount is set to, for example, an amount corresponding to the finishing allowance (for example, 1 to 10 μm). The grindstone base 2 is connected to a rotation driving means such as a motor (not shown) and is rotatable about a rotation axis C. Outer first
The grindstone 3 of, for example, has a particle size of 20 to 6 hardened with a resin bonding agent.
The inner second grindstone 4 is made of superabrasive grains of 0 μm, and is similarly made of superabrasive grains of 5 to 20 μm in size, which are hardened with a resin bonding agent.

While rotating such a multi-step grindstone 10 around the rotation axis C, the work 1 is fed in a direction of an arrow A with a predetermined cut amount. As a result, first, the first grindstone 3 advances while rough-grinding the ground surface 17 of the work 1 to form the rough-processed surface 5. Then, the second grindstone 4 on the inner side advances while finishing grinding, and forms the finished surface 6. By using such a multi-step grindstone 10, 300 mm ³
It becomes possible to grind a workpiece with a machining removal amount of / min or more.

FIG. 2 is a perspective view of a mirror surface grinding machine according to another embodiment of the present invention. The multi-step grindstone 10 is composed of a wheel-type grindstone base 2 and is provided with the first and second ring-shaped grindstones 3 and 4 as described above. Work 1 is, for example, vertical 3
It is a glass material having a width of 0 mm and a width of 100 mm, and is attached to the support base 7 with an adhesive or the like with the processed surface 9 in the vertical direction. The support base 7 is mounted and fixed on a table 8 of this grinding machine.

In the grinding process by the grinding machine having such a structure, first, while rotating the multi-step grindstone 10 around the rotation axis C, the work surface 9 of the work 1 is pressed against the work surface 9 with a depth of cut of, for example, 0.2 to 0.3 mm. Let In this state, it is fed in the horizontal A direction at a processing speed of, for example, 100 mm / min. As a result, as described above, the workpiece 1 is ground while the rough machining by the first grindstone 3 and the finishing machining by the second grindstone with a machining allowance of 1 to 10 μm are simultaneously performed, and a mirror surface having a predetermined flatness is obtained.

FIG. 3 is a block diagram of an example of the multi-step grindstone 10 according to the present invention. In this example, the first and second ring-shaped grindstones 3 and 4 are directly joined to a grindstone base 2 having a through hole 18 in the center to integrally form a structure.

FIG. 4 is a block diagram of another example of the multi-step grindstone 10 according to the present invention. In this example, the first and second grindstones 3 and 4 are each a support ring 1 made of a metal material.
The support rings 11 and 12 are bonded to each other and fixed to the grindstone base 2 with bolts or the like. It is desirable that the screwing is performed at a suitable number of positions along the circumference of each support ring 11 and 12, and that the opening of the screw mounting hole is counterbored so that the screw head is not exposed on the support ring.

FIG. 5 is a schematic view of still another example of the multi-step grindstone 10 according to the present invention. In this example, the whetstone has a three-stage structure, and a third whetstone 16 for intermediate finishing is mounted between the first whetstone 3 for roughing and the second whetstone 4 for finishing. The respective grindstones 3, 4, 16 are bonded onto support rings 13, 15, 14 which are coaxially arranged, respectively. Each support ring is formed such that the outer support ring presses the adjacent inner support ring toward the grinding wheel head 2 side. That is,
The outer support ring 13 covers the outer peripheral flange portion 14a of the intermediate support ring 14 and presses it, so that the intermediate support ring 14
Is configured to cover and press the outer peripheral flange portion 15a of the inner support ring 15, and by fixing only the outer support ring 13 to the grindstone base 2 by screwing, the three support rings 13, 14, 15 are All are fixed to the whetstone base 2.

[0018]

As described above, in the multi-stage grindstone according to the present invention, two or more ring-shaped grindstones having different grain sizes are formed in the rotary grindstone so that the inner grindstone sequentially protrudes from the outer grindstone. Since it is mounted coaxially on the grinding surface side, it is possible to perform from roughing to finishing at the same time using a single multi-step grindstone without exchanging the grindstone, reducing the number of grinding steps and exchanging the grindstone and cutting depth. The time and effort for grinding are greatly reduced by eliminating the trouble of adjusting.
Moreover, since a plurality of whetstones are provided on one whetstone stand,
Maintenance management of the grindstone becomes easy. Further, since the finishing process can be performed at the roughing grinding speed, the amount of grinding removal is large and the grinding efficiency is greatly increased. Furthermore, by setting the difference in the amount of protrusion between the inner and outer whetstones to a predetermined amount in advance, it is possible to carry out grinding with an accurate finishing allowance, and with high flatness and high-precision mirror finish. Is achieved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a basic configuration of a multi-step grindstone according to an embodiment of the present invention.

FIG. 2 is a structural explanatory view of a mirror grinding machine using a multi-step grindstone according to another embodiment of the present invention.

FIG. 3 is a partial sectional side view showing an example of a multi-step grindstone structure according to an embodiment of the present invention.

FIG. 4 is a partial cross-sectional side view showing another example of the multi-step grindstone structure according to the embodiment of the present invention.

FIG. 5 is a partial cross-sectional side view showing still another example of the multi-step grindstone structure according to the embodiment of the present invention.

[Explanation of symbols]

1; Workpiece, 2; Grindstone base, 3; First grindstone, 4; Second grindstone, 5; Rough processed surface, 6; Finished surface, 10; Multi-step grindstone.

Claims (5)

[Claims] 1. A grindstone base connected to a rotating means, a ring-shaped first grindstone fixed to the grindstone mount coaxially with a rotation axis of the grindstone mount, and a grinding surface with respect to the first grindstone. A multi-step grindstone having a ring-shaped second grindstone that projects toward the side by a predetermined amount and is coaxially fixed inside the first grindstone. 2. The multi-step grindstone according to claim 1, wherein the first and second grindstones are directly bonded to the grindstone base. 3. The multi-step grindstone according to claim 1, wherein the first and second grindstones are joined to different support rings, and each support ring is fixed to the grindstone base. 4. A plurality of grindstones including the first and second grindstones are respectively joined on different support rings, each support ring is coaxially arranged on the grindstone base, and between adjacent support rings. 2. The multi-step grindstone according to claim 1, wherein the inner support ring is pressed to the grindstone base side by the outer support ring, and only the outermost support ring is fixed to the grindstone base using a fixing means. 5. The first grindstone is made of superabrasive grains having a large grain size for rough grinding, and the second grindstone is made of superabrasive grains having a small grain size for finishing.
The multi-step grindstone for mirror surface grinding described in.