JP2969166B2 - Workpiece processing method and device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a workpiece processing method and apparatus for processing a workpiece using a rotating tool such as a grindstone or a brush.

2. Description of the Related Art Conventionally, when the outer peripheral side of a rotating rotary tool is brought into contact with a workpiece to uniformly machine the workpiece, the contact force of the rotating tool against the workpiece (hereinafter, simply referred to as contact force) is used. Optimal values had to be taken into account for wear of rotating tools, eccentricity of workpieces, and changes in workpieces. Therefore, for example, Japanese Patent Application Laid-Open
As in the case of Japanese Patent No. 182769, the current value of the electric motor that rotates the rotary tool is detected, the contact force is estimated based on the difference between the current value when there is no load and the load, and the position of the rotary tool is set and moved appropriately.

(Problems to be solved by the invention) However, in the above-mentioned conventional method and apparatus, in order to estimate the contact force between the rotating tool and the workpiece from the current value of the electric motor, various detection devices and complicated arithmetic devices are required. There was a problem.

(Means for Solving the Problems) According to the present invention, however, a fluid pressure cylinder is connected to a rotary tool, the fluid volume in the fluid pressure cylinder is adjusted, and the fluid pressure in the fluid pressure cylinder is kept constant. Therefore, a fluid supply / discharge device is connected to the fluid pressure cylinder, and the fluid pressure in the fluid pressure cylinder is kept constant to keep the contact force constant.

That is, in the method of the present invention, the outer peripheral side of the rotating tool is brought into contact with the workpiece, and in the method of processing the workpiece, the rotating tool is brought into contact with the workpiece at a predetermined pressure by a fluid pressure cylinder adjusted to be constant. The power point of the cylinder is disposed between the center point of the rotary tool and a fulcrum supporting the rotary tool near the rotary tool, and the cylinder is supported at one end opposite to the power point of the cylinder. This is a method for processing a workpiece characterized by the following.

Further, the apparatus of the present invention is an apparatus for processing a workpiece by contacting the outer peripheral side of the rotary tool with a workpiece, wherein the rotary tool is connected to a fluid pressure cylinder via a support arm of the rotary tool,
The power point of the cylinder is disposed between the center point of the rotary tool and a fulcrum of a support arm that supports the rotary tool, near the rotary tool, and the cylinder is supported at one end opposite to the power point of the cylinder. And a fluid supply / discharge device for adjusting a fluid pressure is connected to the fluid pressure cylinder.

The fluid pressure cylinder in the above is a low friction pneumatic cylinder.

(Operation) According to the present invention, a fluid pressure cylinder is connected to a rotary tool, and a fluid supply / discharge device for keeping the fluid pressure in the fluid pressure cylinder constant is connected to the fluid pressure cylinder. By keeping the fluid pressure in the pressure cylinder constant, the contact force between the rotary tool and the workpiece is kept constant, so that the contact force is corrected without using various conventional detection devices and complicated arithmetic devices. be able to.

Further, in an apparatus for processing a workpiece by bringing the outer peripheral side of the rotary tool into contact with a workpiece, the rotary tool is connected to a fluid pressure cylinder via a support arm of the rotary tool, and the power point of the cylinder is applied to the rotary tool. Arranged between the center point and the fulcrum of the support arm that supports the rotating tool, near the rotating tool, and supports the cylinder at one end on the side opposite to the force point of the cylinder to support the fluid pressure cylinder. The configuration is a work processing device characterized by connecting a fluid supply / discharge device for adjusting the fluid pressure, so that a contact force can be obtained with a small cylinder thrust and the rotating tool can be smoothly moved to the workpiece. Can be followed.

(Example) Next, a general configuration of the present invention will be described.

In FIGS. 1 and 2, guide rods 2, 2 are fixed upright to a base 1, and receiving portions 4, 4 are slidably fitted to the guide rods 2, 2, respectively. 4 and 4 are connected and fixed by the holding plate 3. A rotary tool 6 is attached to the rotary tool unit R provided with the electric motor 5,
The rotary tool unit R is fixed to a lower portion of the holding plate 3.

The piston side of the low friction pneumatic cylinder 7 is pivotally connected to the ceiling 1a of the base 1, and the piston rod side of the low friction pneumatic cylinder 7 is pivotally connected to the holding plate 3. Is fishing.

A suction / exhaust port 8 on the piston side of the friction pneumatic cylinder 7
, A silencer 9 is attached. One end of a hose 11 is connected to an intake / exhaust port 10 on the piston rod side of the low friction pneumatic cylinder 7, and the other end of the hose 11 is connected to an air pressure control device (see FIG. 3). (Only the circuit diagram is shown).

FIG. 3 is a circuit diagram of the air pressure control device O. The air pressure control device O includes a regulator B, a solenoid valve D, and a compressor C.

The regulator B senses the pressure in the air chamber A on the piston rod side of the low-friction pneumatic cylinder 7 and, when the pressure in the air chamber A is larger than a preset value, removes the gas in the air chamber A. When the air is exhausted from the chamber A and the pressure in the air chamber A is smaller than the set value, the air supply pipe P between the air chamber A and the compressor C is conducted, and the operation is performed so that the pressure in the air chamber A is always constant. .

The operation of the method and apparatus for processing a workpiece according to the present invention will be described based on the above-described embodiment. When the workpiece W is installed at the machining position, the workpiece W can be inserted below the rotary tool 6.
The holding plate 3 is pulled upward, and the rotary tool 6 is moved in FIG.
Raise to the position indicated by 6C. The lifting of the holding plate 3 is performed by directly connecting the compressor C and the air chamber A by the solenoid valve D.

Next, if the workpiece W is set at a predetermined machining position,
Compressor C and air chamber A by solenoid valve D
And the compressor C and the air chamber A are connected via the regulator B. Thereafter, when the machining is completed, the rotary tool 6 is raised in the same manner as at the start of the machining, the machined workpiece W is taken out from the machining position, then the unmachined workpiece is inserted, and the operation proceeds to the first operation. Repeat this.

Next, a method for holding the contact force will be described with reference to FIGS.

4 to 6, arrow H indicates a force for pushing up the piston E by the gas in the air chamber A, and arrow G indicates a force for pressing the rotary tools 6, 6A and 6B against the workpieces W and Wa by gravity. Arrow F indicates the force that the workpieces W and Wa receive from the rotary tools 6, 6A and 6B, that is, the contact force. FIG. 5 is a schematic diagram when machining an eccentric workpiece Wa, wherein 6A is a rotating tool that moves following the eccentricity of the workpiece Wa, and a broken line 6a indicates the original position of the rotating tool.

FIG. 6 is a schematic diagram when the workpiece W is machined by the worn rotary tool 6B, and the broken line 6b indicates the original position of the rotary tool.

In the state of FIG. 4, the force that the workpiece W receives from the rotary tool 6 and the contact force F are the force G that the rotary tool tries to drop by gravity and the force that the gas in the air chamber A lifts the piston E. H. Therefore, as shown in FIG. 5, when machining an eccentric workpiece Wa,
As shown in FIG. 6, even if the rotating tool wears and the position of the rotating tool moves to the positions represented by 6A and 6B, the air pressure in the air chamber A is always constant by the air pressure control device. As a result, the pushing force H is always constant, and the contact force F represented by the difference between the force G and the force H is always constant.

Next, an embodiment of the present invention will be described with reference to FIG. 3 and FIG.

In FIG. 7, an L-shaped plate 13 for mounting and suspending various devices is fixed to a base 12, and an electric motor is mounted above the ceiling.
A support arm 15 is supported below the support arm 14.

A low friction pneumatic cylinder 7 is suspended. Also, L
A rotary tool unit including a support plate 16 that supports the support arm 15 above the character plate 13, and a rotary tool 6 at the other end of the support arm 15 that has one end supported by the support plate 16. 17 is fixed.

A pulley 18 is mounted on the input shaft of the rotary tool unit 17, and the pulley 18 is connected to one pulley of a double pulley 19 mounted concentrically with the fulcrum Q of the support arm 15. The other pulley of the double pulley 19 is connected to a pulley 20 attached to an output shaft of the electric motor 14 by a belt 21.

In the above description, when the electric motor 14 is driven, the rotary tool 6 is rotated, and has a structure corresponding to the small angle rotation of the support arm 15 accompanying the movement of the rotary tool 6.

Other configurations are the same as the general configuration of the embodiment, and the description of the configuration and operation is omitted. In this embodiment, the motor
Because 14 and rotary tool unit 17 can be divided,
Compared to the general configuration of the embodiment, the configuration is low-cost and compact, but when the support arm 15 rotates by a small angle due to the movement of the rotary tool 6, the force G and the force H are not parallel.
Cannot be kept constant. However, it is recognized that there is a great improvement for a workpiece having a large tolerance as compared with the conventional apparatus.

In this embodiment, the apparatus is of a vertical type, and the pressing force of the rotary tool 6 on the workpiece is obtained by gravity. However, the apparatus is of a horizontal type, and the pressing force of the rotary tool is a fluid pressure cylinder.
It can also be obtained from a spring or the like. In addition, the rotary tool 6
When the rotation of the rotary tool 6 is performed, two air pressure control devices are provided for forward rotation and reverse rotation, respectively, to cope with the rotation direction of the rotary tool 6.

(Effects of the Invention) As described above, according to the present invention, wear of the rotating tool,
Since the contact force does not change even if the workpiece is eccentric or the workpiece is changed, even if a large number of types of workpieces are machined, there is an effect that the accuracy of the machined part of the workpiece can be always kept constant. .

[Brief description of the drawings]

1 is a front view of an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a circuit diagram of an air pressure control device, FIG. 4 is a schematic diagram of a normal state, FIG. The figure is also a schematic view when the workpiece is eccentric and when the rotating tool is worn, respectively.
The figure is a diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1 ... Base, 17 ... Rotary tool unit with electric motor 5 ... Rotary tool unit, 6 ... Rotary tool 7 ... Low friction pneumatic cylinder, 12 ... Base 14 ... Electric motor, 15 ... Support arm B …… Regulator, C …… Compressor D …… Solenoid valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B24B 17/08 B24B 19/08

Claims (3)

(57) [Claims] In a method for processing a workpiece by contacting an outer peripheral side of the rotary tool with a workpiece, when the rotary tool is brought into contact with the workpiece at a predetermined pressure by a fluid pressure cylinder adjusted to be constant. Disposing the power point of the cylinder between the center point of the rotary tool and the fulcrum supporting the rotary tool near the rotary tool, and supporting the cylinder at one end opposite to the power point of the cylinder. A featured work processing method. 2. An apparatus for processing a workpiece by bringing the outer peripheral side of the rotary tool into contact with a workpiece, wherein the rotary tool is connected to a fluid pressure cylinder via a support arm of the rotary tool, and the power point of the cylinder is adjusted. The fluid is disposed between the center point of the rotary tool and a fulcrum of a support arm that supports the rotary tool, near the rotary tool, and supports the cylinder at one end opposite to the power point of the cylinder. A workpiece processing apparatus comprising: a fluid supply / discharge device for adjusting a fluid pressure connected to a pressure cylinder. 3. The workpiece processing apparatus according to claim 2, wherein the fluid pressure cylinder is a low friction pneumatic cylinder.