JPH0379261A - Grinding device - Google Patents

Abstract

PURPOSE:To perform a curved face grinding with high accuracy by providing a driving control means respectively driving a 1st adjusting means and 2nd adjusting means based on the detection signal of a displacement sensor detecting the surface state of a work. CONSTITUTION:A command signal transmitted from the control part of a grinding device is corrected with the correction operation of the characteristic value of the surface shape of a work 6 in the position on a vertical circle D by displacement sensors 36a, 36b. The driving motors 21, 51 of 1st and 2nd adjusting means 20, 50 are thus driven by a specific quantity, the inclination of the induced face 14 of an induction body 12 is adjusted, the motion of three degrees of freedom is given to a grindstone 8 as well, the posture and position are decided so as to be coincident with the surface shape, corresponding to the variation of the surface shape of the work 6 under working and grinding is surely performed under specific grinding conditions, for example grinding speed and notch.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a grinding device, and in particular, to a grinding device used for grinding a workpiece having a complicated surface shape. .

(Prior Art) For example, curved surface grinding of a workpiece having a complicated surface shape, such as a mold used in press molding, is performed using a three-dimensional grinding device.

FIG. 6 is a side view showing an example of a conventional grinding device, which is configured to perform grinding by movement in three-dimensional orthogonal coordinates. "6" is a workpiece, and rlJ is a stand. At the top of these frames 1, 1, there is a Y-axis guide 4,
4 is provided so that the beam member 8 equipped with the drive unit 2 moves linearly in the Y-axis direction. Further, the vertical arm 5 provided on the drive unit 2 is attached so as to be linearly movable in the Z-axis direction. A grindstone 8 for grinding the curved surface of the workpiece 6 is attached to the hand 7 of the vertical arm 5, and this grindstone 8 is rotated by a drive source (not shown). Further, the hand 7 is configured to move in three degrees of freedom by turning in the A direction and the B direction. Then, position data corresponding to the surface shape of the workpiece 6 is stored in the control unit in advance, and the grinding wheel 8 is moved to a predetermined position by a servo motor that operates based on a control signal from the control unit. Curved surface grinding is performed by bringing the workpiece into surface contact with the surface of the workpiece 6 at a predetermined grinding speed.

(Problems to be Solved by the Invention) However, in the conventional grinding device described above, in order to grind the curved surface of the workpiece, under the motion of the orthogonal coordinate system,
Since the hand is rotated and swiveled, the internal structure of the device is not only complicated, but also requires a control unit that operates with high precision to control the movement of the grinding wheel, both of which are unfavorable from a cost and maintenance perspective. .

The present invention solves the various drawbacks and problems associated with the conventional techniques described above, and provides a grinding device that can reliably grind a workpiece with a complex surface shape using a simple structure. The goal is to do something.

[Structure of the Invention (Means for Solving the Problems)] The present invention for achieving the above object includes a grindstone for grinding a workpiece which is swingably attached to the tip of a main shaft rotated by a drive means via a universal joint. A first adjusting means that includes a non-rotating guide member having a guiding surface that has a certain geometric relationship with the grinding surface of the grindstone, and that tilts the guide surface in the direction of an orthogonal axis formed on the grinding surface of the grindstone. and a grinding device for a curved surface workpiece, comprising: a second adjustment means, and a drive control means for driving the first adjustment means and the second adjustment means, respectively, by a displacement sensor that detects the surface condition of the workpiece. It is.

(Function) In the present invention configured as described above, the grindstone is swingably attached to the main shaft rotated by the drive means, the attitude of the grindstone can be adjusted using the adjustment means, and the shape of the workpiece can be detected. Since the posture and position of the grindstone are followed by the grinding wheel, the structure of the device can be made compact, and even curved workpieces with complex surface shapes can be ground reliably and with high precision. can.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view showing the adjustment means of the same embodiment, and FIG. 4.5 is a block diagram showing the control of the first and second A adjustment means of the same embodiment.

In FIG. 1, the grinding device 10 of this embodiment has a sixth
It is attached to the lower part of the vertical arm 5 in the figure by an attachment part 14.

A support frame 15 is fixed to the mounting portion 14, and a movable frame 19 that can slide on the support frame 15 is provided.

The movable frame 19 also has a drive motor 40 as a drive means.
is mounted vertically, and the main shaft 42 is rotated by this drive motor 40. Further, the support frame 15 is provided with a pressure cylinder 16, and the pressure cylinder 1
One end of the piston rod 17 of No. 6 is connected to the movable frame 1 via a member 18.
As a result, when the pressurizing cylinder 16 operates and the piston rod 17 moves forward, the main shaft 42 rotates under pressure.

A universal joint 43 is attached to the tip of the main shaft 42, and a grindstone 8 for grinding the curved surface of the workpiece 6 is attached to one end 45 of the universal joint 43. An inductor 12 is provided on the outside of the universal joint 43 via a bearing 11, and this inductor 1
A guiding surface 14 is formed on the top of the guide plate 2 .

"20" is the first adjustment means, and "50" is the second adjustment means.
:! ! All of the J adjusting means have the same structure and are fixed to the movable frame 19 described above.

In FIG. 2, the twelfth adjustment means 20 includes a rotary motor 21
The output shaft of reversibly rotates the male thread of the ball screw 24 via the joint 22, and the mounting portion 2 of the ball screw 24
The adjustment rod 27 attached to the guide element 26.26 is configured to move linearly in the vertical direction inside the guide element 26. There is.

In FIG. 3, the first: l! Adjustment rod 27 of J adjustment means 20
and 2nd: J! The :A straightening rod 57 of the J straightening means 50 is the sixth
They are arranged so as to be located on the A direction and B direction in the figure, that is, on the orthogonal center lines 1-0-I and n-o-n of the guiding surface 14 of the guide body 12, respectively, and as described above: The framing rods 27 and 57 are connected to the rotation motor 2.
1 and 51 linearly move, vertical displacement is applied to the guiding surface 14 of the guiding body 12, and the guiding surface 14 is inclined by a predetermined angle in the A direction and the B direction with respect to the axis of the main shaft 42, respectively. . The universal joint 43 is guided by the induction body 12 to rotate, and as a result, the grindstone 8 also rotates with an inclination that matches the surface shape of the workpiece 6. Note that an opening 35 is provided in a part of the guiding surface 14 of the guiding body 12, into which a bar 19a attached to the end of the movable frame 19 is inserted, so as to prevent the so-called "tangle" of the guiding body 12. It has become.

On the other hand, the first adjusting means 20 and the second F! In order to operate the adjustment means 50 by a predetermined distance, as shown in FIG. 1, displacement sensors 36a and 36b are provided on the movable frame 19 to detect the inclination of the surface of the workpiece 6 at a position outside the guide member 12. As the displacement sensors 36a and 36b,
For example, a non-contact type laser displacement meter can be used. These laser displacement sensors 36a and 36b are
By irradiating the surface of the workpiece 6 with a laser beam and measuring the reflection time, information about the displacements h+ and h3 from the surface of the workpiece 6 can be detected. As shown in FIG.
0-I''2, and displacement h2. A pair of displacement sensors 38b and 36b for detecting h4 are n -o -n
-1-.

The displacements h1, . Characteristic values of the surface shape of No. 6, such as the inclination at a position on a virtual circle, average displacement, etc. are calculated, and command signals 59a and 59b transmitted from a control section (not shown) are corrected to The drive amount of the rotation motors 21, 51 of the second adjustment means 20.50 is operated. As a result, the posture and position of the grindstone 8 are determined so as to match the surface shape of the workpiece 6.
The grinding process is performed under predetermined grinding conditions. These correction calculation section and control section constitute the drive control means in this embodiment.

In addition, in Figure 4.5, r61a, 61b J are
The amplifiers r62a and 62b J are tachogenerators that generate a voltage proportional to the rotational speed of the rotary motor and reduce the rotational speed of the motor when it approaches a target position to prevent hunting.

Next, the action will be explained.

First, the grindstone 8 is moved to a predetermined position based on a position command corresponding to the surface shape of the workpiece 6, and the main shaft 42 is rotated while applying pressure by the pressure cylinder 16 to rotate the grindstone 8. Further, the displacement sensor 38a,
36b performs a correction calculation on the characteristic value of the surface shape of the workpiece 6 at a position on the virtual circle. As a result, the drive motors 21. of the first and second A adjustment means 20.50.
51 is driven by a predetermined amount, the inclination of the guiding surface 14 of the guiding body 12 is adjusted by 2I, and the grinding wheel 8 is given a motion of 30 degrees to correspond to changes in the surface shape of the workpiece 6 being processed. The posture and position are determined to match the surface shape, and under predetermined grinding conditions, such as grinding speed and depth of cut,
Grinding is performed reliably.

As described above, according to the grinding device of this embodiment, the structure is simplified because the oscillating movement of the grinding surface of the grindstone is performed only by the forward and backward movement of the adjustment rod of the adjustment means. Moreover, it can be expected that the accuracy of the finished dimensions of the workpiece will be improved by grinding.

(Effects of the Invention) As described above, according to the present invention, a simple structure can be adopted, and in addition, the grinding wheel can be adjusted to match the surface shape of the workpiece during processing. The posture is determined by this, which allows curved surface grinding to be performed with high precision.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing the adjustment means of the embodiment, Fig. 3 is a plan view taken along section ■-■ in Fig. 1; 4-5 are block diagrams showing the control method of the same embodiment, and FIG. 6 is a schematic explanatory diagram showing an example of a conventional grinding device. 6... Workpiece, 8... Grinding wheel, 10... Grinding device, 12... Derivative, 14... Guide surface, 20.50
... Adjustment means, 36a, 36b... Displacement sensor, 40... Drive motor (drive means), 42... Main shaft,
43... Universal joint

Claims (1)

[Claims] A grinding wheel for grinding a workpiece is swingably attached to the tip of a main shaft rotated by a driving means via a universal joint, and a non-rotating guide body is provided with a guiding surface having a certain geometric relationship with the grinding surface of the grinding wheel. , a first adjustment means and a second adjustment means are provided for tilting the guide surface in the orthogonal axis direction formed on the grinding surface of the grindstone, and the first adjustment means and the second adjustment means are provided by a displacement sensor that detects the surface condition of the workpiece. A grinding device comprising drive control means for respectively driving the second adjustment means.