JP7442798B2 - Abrasive grain inspection method and abrasive grain inspection device - Google Patents

Description

The present invention relates to an abrasive grain inspection method for inspecting abrasive grains used in a rotary whetstone in the state of individual abrasive grains before forming the rotary whetstone, and an abrasive grain inspection device used in the abrasive grain inspection method.

A technique for inspecting abrasive grains is disclosed in Patent Document 1.
In Patent Document 1, in order to test abrasive grain performance, a group of sampled fine abrasive grains is placed in a container with good visible light transmittance, stirred, and an image of the abrasive grain surface is captured through the wall of the container. By acquiring this information, an estimated abrasive grain characteristic distribution is obtained.

Japanese Patent Application Publication No. 2014-137367

In Patent Document 1, an image of an abrasive grain surface is obtained by photographing abrasive grains contained in a container made of, for example, tempered glass from below the bottom wall of the container. Therefore, since an image of the abrasive grains is only obtained from one direction, only an image of one side surface of the abrasive grains exposed on the lower surface side of the overlapping abrasive grains is obtained. For this reason, it is difficult to accurately obtain the actual shape of the abrasive grain, and the performance of the abrasive grain cannot often be properly understood.

An object of the present invention is to provide an abrasive grain inspection method and an abrasive grain inspection device that can accurately grasp the shape of abrasive grains used in a rotary whetstone and determine the ability of a rotary whetstone using the abrasive grains. .

In the abrasive grain inspection method of the present invention, abrasive grains used in a rotary whetstone are placed on a transparent plate, the abrasive grains are photographed from the front and back of the transparent plate, and the abrasive grains are determined from image data of the front and back sides of the abrasive grains. The method is characterized in that the ability of the rotary grindstone is determined using the following method.

The abrasive grain inspection device of the present invention includes a transparent plate, first and second photographing means provided on the upper side and the lower side of the transparent plate with the transparent plate in between, and for photographing the abrasive grains on the transparent plate; The present invention is characterized by comprising a determining means for determining the ability of a rotary grindstone using the abrasive grains from image data photographed by the first and second photographing means.

In the present invention, image data of the front and back sides of the abrasive grains placed on the transparent plate can be obtained. Then, the ability of the rotary grindstone using the abrasive grains can be determined from the image data of the front and back surfaces.

As described above, in the present invention, since the ability of a rotating grindstone can be determined at the stage of abrasive grains, it is possible to obtain a rotating grindstone that meets the required performance with a high probability.

A cross-sectional view showing a state in which abrasive grains are photographed. FIG. 3 is a perspective view showing a state in which abrasive grains are scattered on a transparent plate. FIG. 2 is a block diagram showing the electrical configuration of the inspection device. Flowchart showing the inspection method.

(Embodiment)
Hereinafter, embodiments embodying the present invention will be described.
As shown in FIG. 1, a transparent plate 13 is installed on a mounting table 12 having a window hole 11. As shown in FIG. This transparent plate 13 may be transparent or semitransparent such as a polarizing plate.

As shown in FIG. 2, abrasive grains 14 are scattered and placed on the transparent plate 13. An upper camera 15 as a first photographing means and a lower camera 16 as a second photographing means are arranged above and below the front and back sides of the transparent plate 13, respectively. The upper camera 15 and the lower camera 16 photograph the abrasive grains 14 on the transparent plate 13 and output image data.

A control device 17 as a determining means shown in FIG. 3 has a central processing unit 18 and a storage section 19. The storage unit 19 stores a program shown in the flowchart of FIG. 4, which will be described later. Image data taken by the upper camera 15 and lower camera 16 is input to the control device 17 . The display unit 20 displays various processing results by the control device 17.

Next, the operation of this embodiment will be explained based on FIG. 4.
The flowchart shown in FIG. 4 shows an operation in which a program stored and set in the storage unit 19 of the control device 17 is executed under the control of the central processing unit 18.

First, as shown in FIGS. 1 and 2, a transparent plate 13 is placed on the mounting table 12 by an operator, and a predetermined amount of abrasive is placed on the transparent plate 13 at a position facing the window hole 11. Grains 14 are scattered. In this case, the amount of abrasive grains 14 is preferably such that the abrasive grains 14 are scattered on the transparent plate 13 at a uniform density and are so dense that they do not overlap vertically.

Then, the program shown in FIG. 4 is started.
In the first step S (hereinafter simply referred to as S)1 of the program, the entire abrasive grain 14 on the transparent plate 13 is photographed from both the upper and lower directions by the upper camera 15 and the lower camera 16, and image data is output, and in S2, The image data is transferred to the control device 17 and stored in the storage section 19. Note that the image data obtained by the lower camera 16 is obtained through the transparent or semi-transparent plate 13. Therefore, since the image data obtained by the lower camera 16 is based on the amount of light lost when the image passes through the transparent plate 13, the image data is stored in the storage unit 19 with the loss compensated for. Then, in S3 and S4, the shape (including size) of each abrasive grain 14 is determined in the image of the upper surface of the abrasive grain 14, and the shape (including size) of each abrasive grain 14 is determined in the image of the lower surface of the abrasive grain 14. The shape (including size) is determined.

Next, in S5 and S6, the stepwise ratio of the shape and size of each abrasive grain 14 on the upper surface side and the lower surface side is calculated based on the image data. That is, in S5 and S6, each abrasive grain 14 indicated by the image data on the upper surface side and the lower surface side is classified in stages according to shape and size, and the number of abrasive grains 14 in each classified group is The ratio of the number of abrasive grains 14 to the total number of abrasive grains 14 is calculated, and the ratio is stored in the storage unit 19. Criteria for this classification, that is, grouping by shape and size, are set in advance in the storage unit 19.

In S7, the ratio of the number of classified groups of the shape and size of the abrasive grains 14 in the image data of the upper and lower abrasive grains 14, in other words, the ratio of the number of classified groups of the upper and lower classified abrasive grains 14 to the total number is determined as an average. be converted into Then, in S8, the ratio of the number of classification groups of the abrasive grains 14 in each shape and size is stored in the storage unit 19 in a database storing the relationship between many classification number ratio patterns and the capacity of the rotary grindstone. be compared. Through this comparison, the standard performance of the rotary whetstone is derived using the photographed group of abrasive grains 14 and the blending ratio of the abrasive grains 14 to the whetstone binding material is determined.

Then, in S9, the machining speed per unit time of the rotary grindstone using abrasive grains having the classification group ratio, in other words, the machining capacity is determined. In S10, the surface roughness of the workpiece after machining when the rotary grindstone is used is determined.

Further, in S11, the degree of chipping or burr generation on the end face of the workpiece when the rotary grindstone is used is determined. For example, when cutting a groove with a width equal to the thickness of the rotating whetstone using a rotating whetstone, if the workpiece is made of a brittle material such as ceramic, chipping may occur at the opening edge of the groove, and if the workpiece is made of metal. In this case, burrs may form on the opening edge of the groove.

The machining capacity, surface roughness, and degree of chipping are determined by machining conditions such as the rotation speed of the rotary whetstone, machining feed amount, and type of workpiece, the diameter of the rotary whetstone, and the ratio of the abrasive grains 14 to the abrasive bonding material of the rotary whetstone. It varies depending on the grinding wheel conditions such as ratio. The relationship between these processing conditions and the grindstone conditions is set in the database. Therefore, each of the above determinations is performed by referring to this database. That is, by referring to this database, the ability of a standard rotary grindstone is corrected according to the processing conditions and grindstone conditions, and the corrected ability is stored and displayed on the display unit 20.

Therefore, the ability of the rotating grindstone using the abrasive grains 14 can be recognized in advance, and a rotating grindstone that meets the required performance can be appropriately manufactured, which can be useful in actual machining.
Therefore, this embodiment has the following effects.

(1) By determining the shape and size of the abrasive grains 14 used in a rotary whetstone, the ability of the rotary whetstone using the abrasive grains 14 can be recognized in advance. Therefore, by selecting the ratio between the abrasive grains 14 and the abrasive grain binding material, the capacity of the rotary grindstone to be manufactured can be appropriately set, and effective machining accuracy and machining speed can be obtained.

(2) When inspecting the abrasive grains 14, the size and shape of the abrasive grains 14 can be determined by simply scattering the abrasive grains 14 on the transparent plate 13, so the inspection work is easy.
(3) Since the abrasive grains 14 are photographed from the top and bottom directions, which are the front and back sides of the transparent plate 13, the size and shape of the abrasive grains 14 can be grasped more accurately than when photographing from either the front and back sides. The ability of the rotary grindstone using the 14 can be accurately grasped before it is used as a rotary grindstone. Moreover, since the front and back sides can be photographed at the same time, the process can be carried out in a short time.

(Example of change)
The embodiment described above can be modified and implemented as follows. The embodiments and the following modified examples can be implemented in combination with each other within a technically consistent range.

- In the embodiment described above, the size and shape of the abrasive grains 14 are determined, but the material of the abrasive grains can be recognized by determining the color and brightness.
- In the determinations in S9 to S11 of the program shown in FIG. 4, machining ability, surface roughness, etc. were determined, but other factors such as the degree of wear of the rotary grindstone should also be determined.

- In the embodiment described above, the classification ratio of the abrasive grains 14 is determined by one photographing, but the classification ratio of the abrasive grains 14 is determined by photographing a plurality of times while moving the abrasive grains 14 on the transparent plate 13. Averaging the image data obtained by.

13... Transparent plate 14... Abrasive grain 15... Upper camera 16... Lower camera 17... Control device

Claims (2)

The abrasive grains used in the rotary whetstone are placed on a transparent plate, the abrasive grains are photographed from the front and back of the transparent plate, and the shape and size of the abrasive grains are determined from the image data of the front and back sides of the abrasive grains. The shape and size of the abrasive grains are classified, the ratio of the amount of abrasive grains in each classified group is calculated, the calculated ratio of the amount of abrasive grains is averaged, and the ability of the rotary grindstone using the abrasive grains is calculated. Abrasive grain inspection method to determine. transparent plate and
first and second photographing means that are provided above and below the transparent plate with the transparent plate in between, and that photograph the abrasive grains on the transparent plate;
The shape and size of the abrasive grains are determined from the image data photographed by the first and second photographing means, the determined shape and size of the abrasive grains are classified, and the amount of abrasive grains in each classified group is determined. Discrimination means that calculates a ratio, averages the calculated ratio of the amount of abrasive grains, and determines the ability of a rotary grindstone using the abrasive grains ;
Abrasive grain inspection device equipped with