JPH0631948U - Grinding machine with whetstone repair device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a grindstone correction device which does not modify the grindstone base feed stroke and the table feed stroke even when installed in an existing two-axis CNC grinder. [Arrangement] In the grindstone correcting device, the axis O of the grindstone correcting tool 7 is located at a position intermediate between the axis O of the grinding wheel 11 and the axis O of the axis of the work spindle, and lower than the both axes by a predetermined offset amount H. As described above, the grindstone correcting tool is attached to the table 1 side of the grinder via the mounting member 3, and the grindstone-side circumferential surface of the grindstone correcting tool is at least closer to the grindstone than the grindwheel-side circumferential surface of the workpiece. The cutting feed position of the grinding wheel corresponding to the correction amount of the grinding wheel is converted by the following positional relationship. X = √ {(R ₁ + R ₂ −ΔR) ² −H ² } X: component of the axial feed distance between the grinding wheel correction tool and the grinding wheel in contact with each other in the cutting feed direction of the grinding wheel R ₁ : the grinding wheel correction tool Radius R ₂ : Radius of grinding wheel
ΔR: Grinding wheel correction amount H: Height difference between the axis of the grinding wheel correcting tool and the axis of the grinding wheel

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grinding device including a grindstone correcting device.

[0002]

[Prior art]

 In the conventional technology, the grindstone correcting device provided in the numerically controlled grinding machine is installed at the location of the following grinding machine and has the following feed axis. In addition, the axis of the work spindle and the grinding wheel 11 is the Z-axis direction, the cutting feed axis of the grinding wheel 11 is the X-axis direction, and the Z-axis direction and the axis direction perpendicular to the X-axis direction are the Y-axis directions. The cutting feed is a direction connecting the center of the grinding wheel 11 and the center of the correction tool 7.

(1) A grindstone correcting device is installed on a grindstone, and on the grindstone, a U axis perpendicular to the Z-axis direction and inclined to the X-axis direction, and a W-axis perpendicular to the U-axis and the Z-axis direction. (2) Grinding wheel correction device is installed on the work table 1, the work table is sent in the Z-axis direction, and the grinding wheel is sent in the X-axis direction (Fig. 6b) (3) A grinding wheel correction device is installed on the work headstock or tailstock on the table 1, the table 1 is sent in the Z-axis direction, and the grinding wheel is sent in the X-axis direction (see Fig. 6c). Teru)

[0004]

[Problems to be solved by the device]

 In a 2-axis CNC grinder, a low-priced numerically controlled diamond wheel or other grinding stone repair tool can be used in order to correct the grinding stone using the existing 2 axes that feed the table 1 and cut the grinding wheel. The forms () to (4) are advantageous. However, when it is adopted in the existing 2-axis CNC grinder, it is necessary to place the two so as to face each other so that the center of the grindstone correction tool such as a diamond roll and the center of the grinding wheel are fed in a direction that cuts the feed. Since the space is limited due to the relationship with the tooling device such as the object driving device, it is necessary to modify the feed process of the grinding wheel head, which leads to an increase in cost. The present invention provides a grinding machine equipped with a grindstone correcting device which does not have such a defect.

[0005]

[Means for Solving the Problems]

 In the grinding machine equipped with the grinding wheel correction device of the present invention, the axis of the grinding wheel correction tool is intermediate between the axis of the grinding wheel and the axis of the work spindle, and is lower than both axes by a predetermined offset amount. The grindstone correction tool is attached to the table side of the grinder through the mounting member so that the grinding wheel side circumferential surface of the grindstone correction tool is at least as far from the grinding wheel side circumferential surface of the workpiece as the grinding wheel. The cutting feed position of the grinding wheel corresponding to the correction amount of the grinding wheel is converted and controlled by the following positional relationship.

X = √ {(R ₁ + R ₂ −ΔR) ² −H ² } X: A component of the axial feed distance of the grinding wheel correction tool and the grinding wheel that are in contact with each other in the cutting feed direction of the grinding wheel R ₁ : Grindstone Correction tool radius R ₂ : Grinding wheel radius ΔR: Grinding wheel correction amount H: Grinding wheel correction tool height difference between grinding tool axis and grinding wheel axis

[0007]

[Action]

In the control unit of the grinder, the height difference H between the axis of the grindstone correcting tool 7 and the axis of the grindstone 11, the radius R ₁ of the grindstone correcting tool, the radius R ₂ of the grindstone surface of the grindstone to be corrected, the correction amount By inputting ΔR, the cutting feed position of the grinding wheel head is calculated and controlled from the positional relationship of the above equation, and the grinding wheel is corrected.

For example, if the radius R ₂ of each position of the grindstone surface in the Z-axis direction is input, the cutting feed of the grinding wheel head is simultaneously performed according to the traverse feed of the table 1, and the R surface of the grindstone surface is fed. Corrections are also made. Furthermore, if the thermal displacement correction value ΔX and the wear amount correction value ΔR _{1 of the} grindstone correction tool itself are also input to the control section, X and R ₁ are corrected by addition and subtraction of them and the above feed position control is performed. .

When correcting the grindstone surface of the grinding wheel 11, the table is moved so that the outer peripheral surface of the grindstone correcting tool 7 faces the grindstone surface to be corrected. The grindstone base, that is, the grindstone wheel that is rotationally driven, is appropriately cut and advanced with respect to the grindstone correcting tool, and the grindstone correcting tool is appropriately fed in the axial direction by table feeding to correct the grindstone surface.

[0010]

【Example】

 A grinding device equipped with a grinding wheel correction device according to an embodiment of the present invention will be described with reference to the drawings. A biaxial CNC cylindrical grinder is exemplified as the grinding device in the embodiment of the present invention, and the grinding wheel correction device provided therein is configured as follows.

In FIGS. 1 and 2, on a table 1 of a grinder, a first support arm portion 3 and a second support arm portion 4 are provided on the inside and the outside (right side and left side in FIG. 2) of a work headstock 2. Is fixed in the horizontal direction and perpendicularly to the longitudinal direction of the table, and the drive shaft 5 has both ends at both ends of the head portions 3a, 4a facing the grindstones of the support arms 3, 4. It is rotatably supported by rolling bearings 6 and 6 so as to project to the outside of the parts 3 and 4.

A whetstone repair tool 7 such as a diamond roll is attached to the projecting end of the drive shaft 5 on the side of the first support arm 3, and the projecting end of the drive shaft 5 on the side of the second support arm 4 is attached. Is attached with a pulley 8. An endless belt 10 is wound around the pulley 8 and the pulley attached to the motor shaft of the grindstone correction tool drive motor 9 mounted on the second support arm 4.

As shown in FIG. 1, the axis of the drive shaft 5, that is, the axis O ₁ of the grindstone correcting tool 7 is the same as the axis O ₂ of the grinding wheel 11 and the machining spindle of the machining headstock 2 located at the same height. It is located at the center of the shaft, that is, in the middle of the shaft center O ₃ of the main shaft center 12, and is lower by H than both shaft centers O ₂ and O ₃ . The grinding wheel side circumferential surface of the grinding wheel correction tool 7 is at least closer to the grinding wheel 11 than the grinding wheel side circumferential surface of the workpiece, and the upper surface of the first supporting arm portion 3 includes the tip head portion 3a. The shape and position do not interfere with the outer peripheral surface of the workpiece supported by the spindle center 12.

In the two-axis CNC grinder, the grinding wheel surface is corrected by cutting feed control of the grinding wheel head (X axis feed) and traverse feed control of the table 1 (Z axis feed). In the correction of the grindstone surface, the positional relationship when the grindstone correcting tool 7 having the radius R ₁ circumscribes the grindstone surface having the radius R ₂ of the grinding wheel 11 at the contact point P is shown in FIG. 1. instead axis O ₂ axis and flush with the axis O ₁ and the grinding wheel 11 of the abrasive stone correction tool 7, i.e., cutting lines and the grinding wheel 11 connecting the axial center O ₁ and the axis O ₂ feed Since it is not parallel to the direction, the cutting feed amount of the grinding wheel 11 corresponding to the correction amount of the grinding wheel 11 must be converted by the following positional relationship.

The component X in the cutting feed direction of the grinding wheel 11 of the distance (R ₁ + R ₂ ) between the axis O ₁ of the grinding wheel correction tool 7 and the axis O ₂ of the grinding wheel 11 is given by the following equation. Become. X = √ {(R ₁ + R ₂ ) ² −H ² } Therefore, the positional relationship when the grindstone of the grinding wheel 11 is corrected by the correction amount ΔR is as follows. X = √ {(R ₁ + R ₂ −ΔR) ² −H ² }

In the control unit of the two-axis CNC grinder, the height difference H between the axis O ₁ of the grindstone correcting tool 7 and the axis O ₂ of the grinding wheel 11, the radius R ₁ of the grindstone correcting tool 7, the grindstone to be corrected If the radius R ₂ of the grindstone surface of the wheel 11 and the correction amount ΔR are input, the cutting feed position of the grindstone base is calculated and controlled from the above positional relationship, and the grindstone is corrected.

For example, if the radius R ₂ of each position of the grindstone surface in the Z-axis direction is input, the cutting feed of the grinding wheel head is simultaneously performed according to the traverse feed of the table 1, and the R surface of the grindstone surface is fed. Corrections are also made. Furthermore, if the thermal displacement correction value ΔX and the wear amount correction value ΔR ₁ of the grindstone correction tool 7 itself are also input to the control section, X and R ₁ are corrected by addition and subtraction thereof, and the above feed position control is performed. Done.

When the grindstone surface of the grinding wheel 11 is corrected, the table 1 is moved so that the outer peripheral surface of the correction tool 7 faces the grindstone surface to be corrected. Further, with respect to the grindstone correcting tool 7 which is rotationally driven by the grindstone correcting tool drive motor 9 through the belt transmission mechanism, the grindstone base, that is, the grindstone wheel 11 which is rotationally driven is appropriately cut and advanced, and the table is fed. The grindstone correction tool 7 is appropriately fed in the axial direction to correct the grindstone surface.

In the above embodiment, the grinding wheel correction device is installed on the work headstock side of the table 1, but may be installed on the tailstock 12 side of the table 1 (see FIG. 3). ). Further, a grindstone repair unit in which the grindstone repair tool 7 is attached to the motor shaft of the grindstone repair tool drive motor 9 may be installed on the table 1 along the extension spindle of the work headstock (see FIG. 4).

Then, if the rotational axis of the grindstone correcting tool 7 is tilted by a small angle α in the horizontal plane and the angle of the cutting position control corresponding to it is corrected, the grinding wheel in an angular grinder can be used as the grindstone correcting tool 7. It can be corrected at the periphery (see Figure 5).

[0021]

[Effect of device]

 The grinding machine equipped with the grinding wheel correction device according to the present invention uses the space on the table that is out of the maximum swing of the touring device such as the workpiece drive device, and the grinding wheel correction device is arranged in the existing grinding machine. Even in the case of a two-axis CNC grinding machine, there is no need to modify the wheel head feed stroke and the table feed stroke. And the cost increase by that is suppressed.

[Brief description of drawings]

FIG. 1 is a partial side view of a grinding device equipped with a grinding wheel correction device according to an embodiment of the present invention.

FIG. 2 is a partial plan view of a grinding device equipped with a grinding wheel correction device according to an embodiment of the present invention.

FIG. 3 is a partial plan view of a grinding device equipped with a grinding wheel correction device according to another embodiment of the present invention.

FIG. 4 is a partial plan view of a grinding machine having a grinding wheel correction device according to another embodiment of the present invention.

FIG. 5 is an explanatory view of a grinding wheel correction device in an angular grinder according to an embodiment of the present invention.

FIG. 6 is an explanatory view of a positional relationship of a grinding wheel correction device according to a conventional technique.

[Explanation of symbols]

 1 table 2 work headstock 3 1st support arm 4 2nd support arm 3a, 4a tip head 5 drive shaft 6 rolling bearing 7 grindstone correction tool 8 pulley 9 grindstone correction tool drive motor 10 endless belt 11 grindstone 12 cores Push platform

Claims (1)

[Scope of utility model registration request] 1. A grindstone correcting tool is mounted via a mounting member so that the axis of the grindstone correcting tool is intermediate between the axis of the grinding wheel and the axis of the work spindle and lower than the two axes by a predetermined offset amount. Installed on the table side of the grinding machine, and the grinding wheel side circumferential surface of the grindstone correction tool is at least closer to the grinding wheel than the grinding wheel side circumferential surface of the workpiece, and the grinding wheel cut corresponding to the grinding wheel correction amount. A grinding device equipped with a grindstone correcting device whose feed position is converted and controlled in the following positional relationship. X = √ {(R ₁ + R ₂ −ΔR) ² −H ² } X: component of the axial center distance between the grinding wheel correction tool and the grinding wheel in contact with each other in the cutting feed direction of the grinding wheel R ₁ : the grinding wheel correction tool Radius R ₂ : Grinding wheel radius ΔR: Grinding wheel correction amount H: Height difference between grinding wheel correcting tool axis and grinding wheel axis