TW202144125A - Grinding device capable of preventing the grinding wheel from being attached - Google Patents

Abstract

A subject of the present invention is to determine a type of a grinding wheel. The solution of the present invention is that the first grinding stone 360 is lowered to enter between a light projecting portion 50 and a light receiving portion 51 of the sensor 5 while rotating a first rotating stone 360 at a predetermined speed by using a rotating means 32. Accordingly, a state in which the light projected by the light projecting portion 50 is blocked by the first grinding stone 360 and a state in which the light projecting portion 50 is not blocked by the first grinding stone 360 are repeated. The time when the light receiving portion 51 does not receive light is measured and compared with the previously stored blocking time through a determination means 6, the grinding wheel mounted at the mounting member 33 is determined as the first grinding wheel 36.

Description

Grinding device

The present invention relates to a grinding device.

As shown in Patent Document 1, in a grinding device, a grinding wheel having a grinding stone arranged annularly on a base is mounted on a mount connected to a front end of a main shaft, and the main shaft is rotated to grind and grind the grinding wheel. As the stone rotates, the rotating grinding stone is brought into contact with the workpiece held on the holding surface of the chuck table, and the workpiece is ground.

Here, the grinding apparatus includes, for example, a biaxial grinding apparatus including rough grinding means equipped with a rough grinding wheel and fine grinding means equipped with a fine grinding wheel. [Previously known technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2017-127936

[Problems to be solved by the invention] In the above-mentioned two-axis grinding device, the rough grinding wheel and the fine grinding wheel may be installed wrongly. When the workpiece is ground, the workpiece and the grinding stone will be damaged. In addition, in the grinding of the workpiece by the uniaxial grinding apparatus provided with one grinding means, an appropriate grinding wheel is selected and used according to the type of the workpiece. Therefore, when exchanging the grinding wheel, there is a problem of so-called wrong installation. Therefore, the grinding device has the problem of preventing wrong installation of the grinding wheel.

[Means for solving problems] The present invention relates to a grinding device comprising: a chuck table for holding a workpiece on a holding surface; a grinding means for mounting a grinding wheel in which a plurality of grinding wheel stones are arranged annularly on a front end of a main shaft, and grinding the workpiece held on the holding surface; and rotating means for rotating the main shaft at a predetermined rotational speed, wherein the grinding device includes a sensor including a light projecting portion for projecting light, and a sensor for receiving the light a light-receiving part of the light projected by the light-projecting part; and a judging means, which can be obtained by making the grinding stone rotating at a predetermined rotational speed enter between the light-emitting part and the light-receiving part of the sensor In the state where the grinding stone blocks the light, use the time that the light-receiving part receives the light, the number of times the light-receiving part receives the light, the time that the light-receiving part does not receive the light, and the number of times that the light-receiving part does not receive the light. to determine the type of the grinding wheel. The above-mentioned grinding wheel is preferably formed of different types according to the conditions described below: the circumferential length of the grinding stones arranged annularly, the number of the grinding stones, the annular arrangement and adjacent to each other. The length of the gap between the grinding stone and the grinding stone, and the number of the gap.

[Inventive effect] For a grinding wheel in which a plurality of grinding stones are arranged annularly, if the grinding stone rotating at a predetermined rotational speed enters between the light-emitting portion and the light-receiving portion of the sensor, light can be shielded by the grinding stone. The state of the grinding wheel is determined by using at least one of the time when the light-receiving part receives light, the number of times the light-receiving part receives light, the time when the light-receiving part does not receive light, and the number of times the light-receiving part does not receive light. Prevents the wrong grinding wheel from being installed.

1 Structure of the grinding device The grinding apparatus 1 shown in FIG. 1 is a grinding apparatus which grinds the workpiece 14 . The configuration of the grinding device 1 will be described below.

As shown in FIG. 1 , the grinding apparatus 1 includes a base 10 extending in the Y-axis direction, and a column 11 erected on the +Y-direction side of the base 10 .

On the side surface on the −Y direction side of the column body 11 , a grinding feed means 4 supporting the grinding means 3 is arranged. The grinding means 3 includes: a main shaft 30 having a rotating shaft 35 in the Z-axis direction; a casing 31 rotatably supporting the main shaft 30; a rotating means 32 serving as a motor, which uses the rotating shaft 35 as an axis to rotatably drive the main shaft 30; and The annular mounting member 33 is connected to the lower end of the main shaft 30 . In FIG. 1 , a first grinding wheel 36 is installed, and the first grinding wheel 36 is installed on the lower surface of the mount 33 . The first grinding wheel 36 is detachable relative to the mounting member 33 , and the mounting member 33 can also be mounted with other types of grinding wheels to replace the first grinding wheel 36 .

The first grinding wheel 36 includes: a first wheel base 361; and a plurality of first grinding stones 360 which are arranged annularly on the lower surface of the first wheel base 361 and have a substantially rectangular parallelepiped shape.

As shown in FIG. 2 , two adjacent first grinding stones 360 are arranged with a first gap length 363 therebetween, and all the first grinding stones 360 are arranged in a ring shape as a whole. Each of the first grinding stones 360 has a first grinding tooth length 364 as its circumferential length. The lower surface 362 of the first grinding stone 360 serves as a grinding surface for grinding the workpiece 14 . In the grinding stone, the grinding quality can be optimized by changing the value of the first grinding tooth length 364 and the value of the first gap length 363. Therefore, various types of grinding wheels with different values are prepared.

Using the rotating means 32 shown in FIG. 1, and using the rotating shaft 35 as the axis to rotate the main shaft 30, the mounting member 33 connected to the main shaft 30 and the first grinding wheel 36 installed on the mounting member 33 will pass through The rotation shaft 35 in the Z-axis direction at the center of the first wheel base 361 rotates as an axis.

The grinding and feeding means 4 includes: a ball screw 40 having a rotating shaft 45 in the Z-axis direction; a pair of guide rails 41 arranged parallel to the ball screw 40; and a Z-axis motor 42 connected to the upper end of the ball screw 40 And take the rotating shaft 45 as the axis to make the ball screw 40 rotate; the lifting plate 43, the inner nut is screwed with the ball screw 40 and the side part is slidingly connected with the guide rail 41; and the holding seat 44, which is connected with the lifting plate 43 and Hold the spindle 30. When the ball screw 40 is driven by using the Z-axis motor 42, and the ball screw 40 rotates about the rotation shaft 45, the configuration described later is obtained: the lift plate 43 moves up and down in the Z-axis direction while being guided by the guide rail 41, Here, the grinding means 3 held by the holder 44 moves in the vertical direction (Z-axis direction) with respect to the holding surface 200 .

The chuck table 2 is arranged on the base 10 . The chuck table 2 includes a disk-shaped suction part 20 and an annular frame body 21 supporting the suction part 20 . The suction portion 20 is a porous member having a plurality of pores, and the upper surface of the suction portion 20 serves as a holding surface 200 for sucking and holding the workpiece 14 . The upper surface 210 of the frame body 21 and the holding surface 200 are formed on the same plane.

A suction source (not shown) is connected to the holding surface 200 of the chuck table 2 . For example, when the workpiece 14 is placed on the holding surface 200 , the workpiece 14 can be sucked and held on the holding surface 200 by operating the suction source.

In addition, a rotation mechanism not shown is arranged on the chuck table 2 . By using this rotation mechanism, the chuck table 2 can be rotated.

A cover 28 is disposed around the chuck table 2, and the cover 28 is connected to the accordion 27 in a retractable manner. When the chuck table 2 moves in the Y-axis direction, the cover 28 moves in the Y-axis direction integrally with the chuck table 2, and the accordion 27 expands and contracts.

The sensor 5 is arranged on the +Y direction side of the chuck table 2 on the base 10 . The sensor 5 includes a base 53 and a light-emitting and receiving element 54 arranged on the base 53 . The light projecting and receiving element 54 is a member including a recessed portion penetrating the X-axis direction, and includes a light projecting portion 50 that projects light and a light receiving portion 51 that receives light projected from the light projecting portion 50 .

It is assumed that the voltage is detected when the light projected from the light projecting unit 50 is received by the light receiving unit 51 , and the voltage is not detected when the light projected from the light projecting unit 50 is not received by the light receiving unit 51 .

The sensor 5 is connected to the judgment means 6 . The judging means 6 has a method of judging the type of grinding wheel based on at least one of the time when the light receiving portion 51 receives light, the number of times the light receiving portion 51 receives light, the time when the light receiving portion 51 does not receive light, and the number of times the light receiving portion 51 does not receive light. Features. For example, the time corresponding to the first grinding tooth length 364 shown in FIG. 2 and the time when the light receiving portion 51 does not receive light, that is, the first light blocking time, is stored in the judgment means 6 in advance.

2 Operation of the grinding device (grinding processing) The operation of the grinding device 1 when grinding the workpiece 14 using the above-described grinding device 1 will be described. When grinding the workpiece 14 using the grinding device 1 , first, the workpiece 14 shown in FIG. 1 is placed on the holding surface 200 of the chuck table 2 . Then, a suction source not shown connected to the chuck table 2 is operated, and the generated suction force is transmitted to the holding surface 200 . Thereby, the workpiece 14 is attracted and held by the holding surface 200 .

In a state where the workpiece 14 is sucked and held on the holding surface 200 , the chuck table 2 is moved in the +Y direction using a Y-axis moving means not shown, etc., and is positioned below the grinding means 3 . Next, the chuck table 2 is rotated using a rotation mechanism (not shown), the workpiece 14 held on the holding surface 200 is rotated, and the first grinding stone 360 is rotated about the rotation shaft 35 using the rotation means 32 .

In a state in which the workpiece 14 is rotated about the rotating shaft of the above-mentioned rotating mechanism (not shown), and the first grinding stone 360 is rotated about the rotating shaft 35, the grinding feed means 4 is used to move the grinding means 3 toward - Descending in the Z direction. By lowering the first grinding stone 360 in the −Z direction, the lower surface 362 of the first grinding stone 360 contacts the upper surface 140 of the workpiece 14 . In a state where the lower surface 362 is in contact with the upper surface 140 of the workpiece 14 , the workpiece 14 is ground by further descending the first grinding stone 360 in the −Z direction. After the grinding process of the workpiece 14 is completed, the grinding feed means 4 is used to move the grinding means 3 in the +Z direction, the first grinding stone 360 is separated from the upper surface 140 of the workpiece 14, and then separated from the chuck table 2. The holding surface 200 of the workpiece 14 is carried out.

(Judgment of the type of grinding wheel) In the grinding apparatus 1 , before grinding the workpiece 14 , the sensor 5 is used to determine the type of the grinding wheel mounted on the mount 33 . Hereinafter, the operation of the grinding device 1 when the type of the grinding wheel is judged will be described. In the present embodiment, it is determined that the grinding wheel mounted on the mounting member 33 is the first grinding wheel 36 shown in FIG. 2 or the second grinding wheel 37 shown in FIG. 3 .

In FIG. 3, the top view of the 2nd grinding wheel 37 is shown. The second grinding wheel 37 includes: an annular second wheel base 371; surface. The second grinding stone 370 has a substantially rectangular parallelepiped shape like the first grinding stone 360 , and the length in the circumferential direction is the second grinding tooth length 374 , which is a length shorter than the first grinding tooth length 364 . Length of the second grinding wheel 37 in the circumferential direction of each of the annularly arranged grinding stones, the number of the grinding stones, and the length of the gap between the annularly arranged and adjacent grinding stones and the grinding stones , The number of the clearance is different from that of the first grinding wheel 36 . That is, the first grinding tooth length 364 is different from the second grinding tooth length 374 . Also, the first gap length 363 is different from the second gap length 373 . Furthermore, the number of the first grinding stones 360 included in the first grinding wheel 36 is different from the number of the second grinding stones 370 included in the second grinding wheel 37 . In addition to this, the number of gaps between adjacent first grinding stones 360 and the number of gaps between adjacent second grinding stones 370 are different.

When determining the type of the grinding wheel, first, the sensor 5 shown in FIG. 1 is operated, and light is projected from the light projecting part 50 of the light projecting and receiving element 54 toward the light receiving part 51 .

Next, using the rotating means 32, for example, the first grinding wheel 36 attached to the mounting member 33 is rotated at a predetermined speed. Here, the predetermined speed is set to 10 rpm, for example.

Then, the first grinding wheel 36 is lowered by an appropriate distance in the −Z direction using the grinding feed means 4 . In this way, as shown in FIG. 4 , the first grinding stone 360 enters the concave portion 540 of the light projecting and receiving element 54 , and the lower surface 362 of the first grinding stone 360 is positioned at a distance from the projection connecting the light projecting portion 50 and the light receiving portion 51 with a straight line. The height position of the light-receiving connection line 52 is further down.

At this time, since the first grinding stone 360 rotates, the state where the first grinding stone 360 overlaps with the light-emitting and receiving line 52 and is blocked from light, and the first grinding stone 360 is not connected to the light-emitting and receiving line 52 is alternately repeated. The state of overlapping without being blocked.

In FIG. 5 , a graph showing a change in the voltage detected by the sensor 5 when the light projected from the light projecting portion 50 by the rotating first grinding stone 360 is repeatedly blocked and not blocked. . In FIG. 5 , when the first grinding wheel 36 rotates at a predetermined rotational speed, the time when the light projected from the light projecting part 50 is blocked by the first grinding stone 360 , that is, the first blocking time 365 , and the time from The time when the light projected by the light projecting unit 50 is received by the light receiving unit 51 without being blocked by the first grinding stone 360 and the first light receiving time 366 . During the first light blocking time 365, the value of the voltage becomes 0V. In addition, in the first light receiving time 366, the value of the voltage becomes a value other than 0V (for example, 5V).

Here, in the determination means 6 shown in FIG. 1 , the first light blocking time 365 is stored in advance. If the stored first shading time 365 is consistent with the measured shading time, the judging means 6 determines that the grinding wheel installed on the mounting member 33 is the first grinding wheel 36 .

On the other hand, consider a case where, for example, the second grinding wheel 37 is attached to the mount 33 instead of the first grinding wheel 36 . In a state where the lower surface 372 of the second grinding stone 370 shown in FIG. 3 is positioned lower than the height position of the light-emitting and receiving line 52 shown in FIG. Shading state and non-shading state. In FIG. 6, the graph which shows the change of the voltage detected by the sensor 5 when the projected light is interrupted by the 2nd grinding wheel 37 is shown.

The time when the light projected from the light projecting part 50 is blocked by the second grinding stone 370 is set as the second light blocking time 375, and the light projected from the light projecting part 50 is not blocked by the second grinding stone 370 but is blocked by the light receiving part The time when 51 is received is set as the second light receiving time 376 . In the judgment means 6 shown in FIG. 1 , for example, a second light blocking time 375 when the second grinding wheel 37 rotates at a predetermined rotational speed is stored in advance, and the second light blocking time 375 corresponds to the second grinding stone 370 . The second grinding tooth length 374 corresponds. If the stored second shading time 375 is consistent with the measured shading time, the judging means 6 determines that the grinding wheel mounted on the mounting member 33 is the second grinding wheel 37 .

Moreover, in the grinding apparatus 1, the type of grinding wheel can be judged not only by the time when the light receiving part 51 does not receive light, but also by the time when the light receiving part 51 receives light, for example. For example, the first light-receiving time 366 and the second light-receiving time 376 may be stored in the determination means 6 in advance, and based on the measured light-receiving time, it may be determined whether the grinding wheel mounted on the mounting member 33 is the first grinding wheel 36 or the second grinding wheel 37.

Furthermore, for example, the number of times the light receiving portion 51 receives light during one rotation of the first grinding wheel 36 and the second grinding wheel 37, that is, the number of gaps between adjacent grinding stones, is stored in the judgment means 6, respectively. , and measure the number of times the light-receiving portion 51 receives light during the actual rotation of the grinding wheel, thereby determining which of the first grinding wheel 36 and the second grinding wheel 37 is mounted on the mounting member 33 .

In addition to this, for example, the number of times the light-receiving portion 51 does not receive light during one rotation of the first grinding wheel 36 and the second grinding wheel 37, that is, the number of grinding stones, is stored in the judgment means 6, respectively, and measured. The number of times the light-receiving portion 51 does not receive light during the actual rotation of the grinding wheel can determine which one of the first grinding wheel 36 and the second grinding wheel 37 is attached to the mount 33 .

As described above, the type of grinding wheel is determined by using at least one of the time when the light receiving portion 51 receives light, the number of times the light receiving portion 51 receives light, the time when the light receiving portion 51 does not receive light, and the number of times the light receiving portion 51 does not receive light. , which can prevent the wrong grinding wheel from being installed, and can prevent the damage to the workpiece and the grinding stone caused by using the wrong grinding wheel.

In addition, in the present embodiment, it is determined whether the grinding wheel mounted on the mount 33 is the first grinding wheel 36 or the second grinding wheel 37, but even in the case of three or more grinding wheels, the same method can be used make a judgment.

1: Grinding device 10: Pedestal 11: Cylinder 14: Processed objects 140: Upper surface 2: Chuck table 20: Attraction Department 200: keep face 21: Frame 210: The upper surface of the frame 27: Snake Belly 28: Cover 3: Grinding means 30: Spindle 31: Shell 32: Rotation Means 33: Mounting pieces 35: Rotary axis 36: First grinding wheel 360: First Grinding Grinding Stone 361: First round abutment 362: Lower Surface 363: First gap length 364: Length of the first grinding tooth 365: First shading time 366: The first light receiving time 37: Second grinding wheel 370: Second Grinding Stone 372: Lower Surface 373:Second gap length 374: Length of the second grinding tooth 375: Second shading time 376: Second light receiving time 4: Grinding feed method 40: Ball screw 41: Rails 42: Z-axis motor 43: Lifting plate 44: Hold the seat 45: Rotary axis 5: Sensor 50: Projection part 51: Light receiving part 52: Projecting and receiving light connection 53: Abutment 54: Light-emitting and receiving element 6: Judgment means

FIG. 1 is a perspective view showing the entirety of a grinding apparatus. Figure 2 is a top view of the first grinding wheel. Figure 3 is a top view of the second grinding wheel. 4 is a cross-sectional view of a state in which a grinding stone shields light projected from a light-projecting portion of a sensor viewed from the side. FIG. 5 is a graph showing a change in voltage when the first grinding wheel intermittently shields light from a light projecting portion. FIG. 6 is a graph showing a change in voltage when the second grinding wheel intermittently shields light from a light projecting portion.

3: Grinding means

5: Sensor

6: Judgment means

30: Spindle

32: Rotation Means

33: Mounting pieces

36: First grinding wheel

360: First Grinding Grinding Stone

361: First round abutment

362: Lower Surface

50: Projection part

51: Light receiving part

52: Projecting and receiving light connection

54: Light-emitting and receiving element

540: Recess

Claims (2)

A grinding device comprising: A chuck table, which holds the workpiece on the holding surface; Grinding means, which mounts a grinding wheel with a plurality of grinding stones annularly arranged at the front end of the main shaft, and grinds the workpiece held on the holding surface; and a rotating means that rotates the main shaft at a predetermined rotational speed, Among them, the grinding device has: a sensor including a light projecting portion that projects light, and a light receiving portion that receives the light projected by the light projecting portion; and Determining means for using the grinding stone in a state in which the grinding stone rotating at a predetermined rotational speed enters between the light projecting portion and the light receiving portion of the sensor so that the light can be shielded by the grinding stone The type of the grinding wheel is determined by at least one of the time that the light-receiving part receives the light, the number of times the light-receiving part receives the light, the time that the light-receiving part does not receive the light, and the number of times that the light-receiving part does not receive the light. The grinding device according to claim 1, wherein the grinding wheel train is formed of different types depending on the following conditions: the circumferential length of the grinding stones arranged annularly, the number of the grinding stones, the annular The length of the gap between the grinding stone and the grinding stone adjacent to each other, and the number of the gap.

Images