JP2003071687A - Surface grinding method and surface grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface grinding method and a surface grinding machine utilizing a planetary mechanism for improving grinding precision and rigidity and simplifying construction. SOLUTION: The grinding method comprises fixing a grinding spindle center O1 of a rotary grinding wheel 5 and rotating a workpiece W as well as revolving it around the grinding spindle center O1 . Preferably, the workpiece W is revolved so that a revolution track C1 of a rotation spindle center O2 is within the grinding rage of the rotary grinding wheel 5. The surface grinding machine comprises a rotary grinding spindle 1 having the fixed grinding spindle center O1 and the workpiece driving planetary mechanism for holding the workpiece W rotatable and revolvable around the grinding spindle center O1 . The planetary mechanism has a revolution radius E set so that the revolution track C1 of the rotation spindle center O2 of the workpiece W is within the grinding rage of the rotary grinding wheel 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface grinding method and a surface grinding machine for grinding a flat surface of a workpiece with a rotary grindstone.

[0002]

2. Description of the Related Art In a surface grinding method and a surface grinder using a rotary grindstone, in order to uniformly grind the entire grinding surface,
There are a surface grinding method and a surface grinder that employ a so-called planetary grinding method.

The conventional planetary grinding system of this type grinds a flat surface of a workpiece by fixing the workpiece at a fixed position and revolving the periphery of the workpiece while rotating a rotating grindstone around the axis of the grindstone. Has become.

[0004]

As in the conventional method, the planetary mechanism is used to drive the rotary grindstone, and the rotary grindstone is rotated and revolves around the workpiece. There are such challenges.

(1) The planetary mechanism for supporting the grindstone shaft so that it can rotate and revolve has to be supported by a column or the like in a cantilever manner. However, such a cantilevered support structure reduces the rigidity of the grindstone shaft and causes vibration. It causes the occurrence.

(2) Since the planetary mechanism for supporting the grindstone shaft so as to be able to rotate and revolve has a complicated structure, the piping structure of the cooling liquid flowing from the grindstone shaft to the grinding surface is also complicated.

(3) Since the planetary mechanism for supporting the grindstone shaft so as to be able to rotate and revolve has a complicated structure, the size of the grindstone shaft is limited, and this also causes a decrease in the rigidity of the grindstone shaft.

[0008]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and a surface grinding method according to claim 1 is to rotate a workpiece by a planetary mechanism and revolve it around a wheel axis. Is characterized in that the ground surface of the workpiece is surface-ground.

According to a second aspect of the present invention, in the surface grinding method according to the first aspect, the workpiece is revolved so that the revolution locus of the rotation axis falls within the grinding range of the rotary grindstone.

A surface grinder according to a third aspect of the present invention includes a grindstone shaft having a fixed grindstone shaft center position, and a planetary mechanism for driving the workpiece so that the workpiece can be rotated and revolved around the grindstone axis. It is characterized by that.

According to a fourth aspect of the present invention, in the surface grinding machine according to the third aspect, the planetary mechanism sets the revolution radius such that the revolution locus of the rotation axis of the workpiece falls within the grinding range of the rotary grindstone. It is characterized by being done.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION [Rotating Grinding Wheel] FIG. 1 is a front view showing a vertical cross-section surface grinding machine to which the present invention is applied in a partial cross section. The grinding wheel shaft 1 is arranged in a vertical posture and can be moved up and down. Is supported by a column (not shown). The position of the rotary shaft core O1 of the grindstone shaft 1 is fixed, and is rotated (X1) around the rotary shaft core O1 by a drive mechanism (not shown). A grindstone holder 2 is provided at the lower end of the grindstone shaft 1, and a cylindrical rotary grindstone 5 is detachably fixed to the lower surface of the grindstone holder 2. A cooling liquid passage 6 having an open lower end is formed in the grindstone shaft 1, and the cooling liquid passage 6 is connected to a cooling liquid supply source (not shown) so that the cooling liquid can be supplied to the grinding surface 30. .

[Planetary Mechanism for Driving a Workpiece] A planetary housing 10 is disposed below the rotary grindstone 5, and the housing 10 is a stationary member and is fixed to the floor or the like. On the drum supporting boss 10a formed on the upper wall of the housing 10, a rotary drum 11 for revolving the workpiece is rotatably supported about the same axis as the grindstone axis O1. A driven pulley 12 is fixed to the lower end portion of the rotating drum 11, and the driven pulley 12 is provided on the outer wall surface of the housing 10 and is a drive motor 1 for revolving a workpiece.
4 is connected to the drive pulley 15 via a belt 16. A cover 18 is fixed to the upper end of the rotary drum 11.

Inside the rotary drum 11, a rotary shaft 20 for rotating a workpiece rotates, having a rotary shaft center O2 parallel to the grindstone shaft center O1 at a position eccentric from the grindstone shaft center (rotating drum shaft center) O1. Supported as possible. The workpiece W is detachably fixed to the upper end of the rotary shaft 20 for rotating the workpiece via a workpiece jig 21, and the transmission gear 23 is fixed to the lower end of the rotary shaft 20. The transmission gear 23 meshes with a drive gear 25 of a drive motor 24 for rotating the workpiece, which is arranged below the rotary drum 11. The drive motor 24 for rotating the workpiece is arranged on the same axis as the grindstone axis (rotary drum axis) O1, and is fixed to the mount 26 and the like.

FIG. 2 is a plan view of the rotary grindstone 5 and the planetary mechanism. The eccentricity (revolution radius) E of the rotary shaft 20 for rotating the workpiece is at least the outer peripheral surface 5 of the cylindrical rotary grindstone 5.
It is set to be smaller than the radius R1 of a, and in this embodiment, is set to be smaller than the radius R1 of the outer peripheral surface 5a of the rotary grindstone 5 and slightly larger than the radius of the inner peripheral surface 5b of the rotary grindstone 5. Has been done. The circumference indicated by reference numeral C1 indicates the orbit of the rotation axis O2 for rotation. In this way, the revolution radius E of the workpiece W is set to the radius R of the outer peripheral surface 5a of the rotary grindstone 5.
By setting the workpiece W to be smaller, at any revolution position (for example, revolution position A1, A2, A3, A4, etc.), the entire ground surface (upper surface) of the workpiece W is rotated by the rotation around the rotation axis O2. Can be ground.

[0016]

(1) In FIG. 1, when the workpiece is mounted, the rotary grindstone 5 is raised together with the rotary grindstone shaft 1, and the workpiece jig 21 is provided on the upper end of the rotary shaft 20 for rotating the workpiece. The workpiece W is fixed.

(2) By rotating the workpiece rotation drive motor 24, the workpiece rotation shaft 20 is rotated about the rotation axis O2 through the drive gear 25 and the transmission gear 23. The workpiece W is rotated (X2) around the rotation axis O2.

(3) The rotating grindstone 5 is lowered while rotating to grind the upper end ground surface 30 of the workpiece W with a predetermined grinding allowance, and the driving motor 14 for revolving the workpiece is driven to rotate the rotary drum 11. The workpiece W is revolved around the grindstone axis O1 by rotating around the grindstone axis O1. During the grinding, the cooling liquid is supplied from the cooling liquid passage 6 of the grindstone shaft 1 toward the grinding surface 30 to cool the grinding surface 30.

In this way, the workpiece W is rotated about the axis of rotation O2 and the periphery of the rotary grindstone is revolved around the axis O1 of the grindstone to grind the ground surface 30.

The drive motor 24 for rotating the rotary drum 11
Since it is arranged on the same axis as the rotation axis O1 and is fixed to a stationary member such as the mounting base 26, the rotation power is transmitted to the rotation shaft 20 for rotation without any trouble even when the rotating drum 11 is rotating. In addition, the wiring of the drive motor 24 and the like are simpler than when the drive motor is attached to the rotary drum 11.

[0021]

As described above, according to the present invention,
Since the grindstone axis O1 position of the rotary grindstone 5 is fixed, the workpiece is rotated by the planetary mechanism and the periphery of the grindstone is revolved around the grindstone axis O1, so that the workpiece is surface-ground. It has the following advantages.

(1) Since the position of the grindstone shaft core O1 of the rotary grindstone 5 is fixed, there is almost no limitation on the diameter dimension of the grindstone shaft 1 and the rigidity of the grindstone shaft 1 can be easily improved.

(2) Since the planetary mechanism is used for rotating and revolving the workpiece, supporting the planetary mechanism on both sides at a position with a low center of gravity improves the support rigidity, vibration during grinding, etc. Can be suppressed and the processing accuracy is improved.

(3) Since the position of the grindstone shaft core O1 of the rotary grindstone 5 is fixed, the lifting mechanism of the grindstone shaft 1 can be simplified and the strength can be improved.

(4) Since the position of the grindstone axis O1 of the rotary grindstone 5 is fixed, the piping structure of the cooling liquid passage 6 supplied to the grinding surface 30 can be simplified.

(5) Since the planetary mechanism is used for rotating and revolving the workpiece, the planetary mechanism is supported on both sides at a position where the center of gravity is low, so that the planetary mechanism is held on the column as in the conventional case and the rotating grindstone is used. As compared with the one that supports and is capable of rotating and revolving, the dimensional limitation is relaxed, and the rigidity can be improved.

(6) By revolving the workpiece so that the revolution locus C1 of the rotation axis O1 falls within the grinding range of the rotary grindstone 5, the grinding accuracy on the entire grinding surface is made more uniform.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross section of a surface grinder to which the present invention is applied.

FIG. 2 is a plan view of a rotary grindstone and a planetary mechanism.

[Explanation of symbols]

1 wheel axis 5 rotating whetstone 10 Housing of planetary mechanism 11 Rotating drum for revolving workpieces 12, 15 Pulley for workpiece revolution 14 Drive motor for work revolution 20 Rotating shaft for rotation of workpiece 24 Drive motor for workpiece rotation

Claims (4)

[Claims] 1. A grinding surface of a workpiece is surface-ground by fixing the position of the spindle axis of a rotary grindstone, rotating the workpiece by a planetary mechanism and revolving around the spindle axis of the workpiece. Surface grinding method. 2. The surface grinding method according to claim 1, wherein the workpiece is revolved so that the revolving locus of the rotating shaft core falls within the grinding range of the rotary grindstone. 3. A surface grinding machine comprising: a grindstone shaft having a fixed grindstone shaft center position; and a workpiece driving planetary mechanism for holding the workpiece so as to be rotatable and revolvable around the grindstone shaft center. Board. 4. The surface grinding machine according to claim 3, wherein the planetary mechanism has a revolution radius set such that the revolution trajectory of the rotation axis of the workpiece falls within the grinding range of the rotary grindstone. .