JPH1133908A - Automatic grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a workpiece to be ground smooth, and grinding of the workiece to be carried out efficiently, without consideration of materials and properties, etc., of the workpiece and a grinding wheel. SOLUTION: A grinding wheel 9 rotated in fixed position, and a support table 10 capable of being displaced to the front and the rear and right and left f1, f2 by servomotors 14, 17 are provided, and a worktable 18 is mounted on this support table 10 so that it can be displaced within a certain distance through a guide track means 19 headed for the grinding wheel, while a work holding and rotating means 26 which rotates a work w by a servomotor 29 is provided on this worktable 18. Further, this machine is constructed by providing external force applying means 22, 25 to apply moving force for displacing the worktable toward the grinding wheel within the displacement extent by the guide track means 19, as well as by fitting a sensor 30 to detect the worktable being positioned at an end point of the grinding wheel side of the displacement extent by the guide track means 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic grinding machine having a grindstone driven to rotate.

[0002]

2. Description of the Related Art There is a grinding machine which automatically performs grinding by pressing a work on a rotating grindstone.
In this type of grinding machine, the work is generally rotated continuously in a fixed direction around a fixed axis while being pressed against the grindstone, and the relative position between the work and the grindstone is determined by the rotation amount of the servomotor. Is fixed to a specific state corresponding to

[0003]

In the above-mentioned conventional grinding machine, even when it is not necessary to grind the entire circumference of the work, the work is operated so as to rotate 360 degrees. Useless operation occurs. Also, when controlling the relative position of the work and the grindstone, it is necessary to strictly consider the conditions such as the material of the work and the grindstone, and if this is not done, the grinding will not be performed smoothly. Or damage to the machine.

An object of the present invention is to provide an automatic grinding machine which can solve the above-mentioned problems.

[0005]

In order to achieve the above object, according to the present invention, there is provided a grindstone which is driven to rotate around a fixed axis on a base, and which is displaced back and forth and right and left by a servomotor at a position related to the grindstone. A work table is mounted on the support table such that the work table can be displaced by a fixed dimension via a guide orbit means directed to the grindstone. An external force applying means for providing a work gripping and rotating means for rotating the work table around the center, and for applying a moving force of an appropriate magnitude for displacing the work table to the grindstone within a displacement range of the guide track means; And a sensor for detecting that the work table is located at the grinding wheel side end point within the displacement range of the guide track means. .

In using the present invention, a computer numerical controller for controlling each servomotor is formed. The detection signal of the sensor is input to the control device.

The grinding wheel may be operated at a fixed position. Alternatively, the grinding wheel may be vertically displaced by a servomotor controlled by a computer numerical controller.

The work rotating shaft of the work holding and rotating means is reciprocated within a certain angle range around a certain axis by a forward / reverse rotation operation of a servo motor as required.

[0009]

1 shows a grinding machine according to one embodiment of the present invention, wherein A is a plan view, B is a side view, and FIG. 2 is an operation explanatory view showing a part of the grinding machine. FIG. 3 is a view showing an example of a work processed by the grinding machine.

In the figure, 1 is a base and 2 is a base 1.
This is a whetstone stand that is fixed upright. A grindstone device 4 is mounted on the front surface of the grindstone base 2 via vertical guide track means 3 so as to be vertically slidable by a servomotor 5.

The grindstone device 4 is provided with a motor 7 and a main shaft 8 driven by the motor 7 on a slide table 6 guided by the vertical guide track means 3, and a disk-shaped grindstone 9 is mounted on the main shaft 8. There is a fixed configuration.

Reference numeral 10 denotes a support table which can be displaced in the front-rear direction f1 and the left-right direction f2 via the support guide means 11.

The supporting and guiding means 11 is as follows. That is, a pedestal 12 is provided on the base 1, and the left and right guide track means 13, 1
3 is fixed. Above the cradle 12, the servo motor 1
4, an intermediate slide 15 is provided which is slidably displaced in the left-right direction f2 via the left-right guide track means 13, 13 and guides the support table 10 on the upper surface of the slide 15 in the front-rear direction f1. In addition to providing the front and rear guide track means 16 and 16, a servomotor 17 for displacing the support table 10 in the front and rear direction f1 is provided.

Reference numeral 18 denotes a work table provided on the upper surface of the support table 10, which is provided so as to be displaceable in the front-rear direction f 1 via front-rear guideway means 19 toward the grindstone 9. The front / rear guide track means 19 includes a plurality of bearings 20 fixed to the upper surface of the support table 10 and at least two forward / rearward sliding shafts 21 supported on the lower surface of the work table 18 by the bearings 20 so as to be movable back and forth. Is fixed.

Further, the work table 18 is moved within the range of movement by the front-rear
An external force applying means for applying a moving force of an appropriate magnitude for displacing to the side is provided. The external force applying means is, specifically, a front part of the work table 18 and a bearing 20.
And a compression spring 22
Or a pulley 23 is provided on the grindstone table 2 or the like, a rope 24 having one end fixed to the work table 18 is wrapped around the pulley 23, and a weight 25 is attached to the other end. Make a fixed configuration.

A work holding and rotating means 26 is provided on the upper surface of the work table 18 so as to be capable of adjusting the right and left positions by manual operation. Specifically, the work gripping and rotating means 26 is provided with a pair of left and right work rotating shafts 27 and 28 having work gripping portions 27a and 28a at the ends, and a servo motor for rotating these rotating shafts 27 and 28. 29 are provided.

Reference numeral 30 denotes a sensor provided on the upper surface of the support table 10, and the work table 18
When it is located at the end point on the grinding wheel 8 side of the displacement range by 9, this is detected and a detection signal is issued. Reference numeral 31 denotes a protrusion fixed to the work table 18 for pressing the sensing portion 30a (see FIG. 2) of the sensor 30. Reference numeral 32 denotes a stopper bolt screwed to the upright portion of the support table 10, which stops the forward movement of the work table 18 at the end point on the grinding wheel 9 side.

In addition to the above, a computer numerical controller (not shown) is provided.
0 detection signal is input, and each servo motor 14, 17,
29.

Next, an example of use of the grinding machine of the present invention having the above-described structure and its operation will be described. The operator creates processing data using a personal computer. For example, when grinding the peripheral end surface of the ceramic square plate w as shown in FIG. 3 as a work, the diameter of the grindstone 9 and the radius r from the specific center p of the work w to the peripheral end surface are recorded on a floppy disk.

At this time, if a part of the work w is ground, the radius r of the work w is sufficient for only the part to be ground, and the information of the radius r of the work w is obtained at every constant angular interval around the specific center p. The number of points is sufficient if the shape of the grinding part is simple, and about 100 points are sufficient. If the shape is complicated, the number is appropriately increased.

By causing the computer numerical control device to read the recorded items of the floppy disk created in this way, the processing data is input to the CPU. This processing data is corrected by the CPU to control data of about tens of thousands of points, and the computer numerical controller controls the servomotors 14, 17, 29 based on this data.

On the other hand, the work holding parts 27a, 28
The workpiece w is gripped by a. At this time, the center of rotation of the workpiece rotation shafts 27 and 28 is matched with the specific center p of the workpiece w. Thereafter, the respective parts are brought into the operating state, whereby the following operations are automatically performed.

That is, the servo motors 14 and 17 are appropriately rotated, and the work table 5 is moved together with the support table 10 so as to be close to the grindstone 9 based on the control data.
Thus, the work w is brought into contact with and pressed by the rotating grindstone 9. The pressing force of the grindstone 9 acting on the work w moves the work table 18 backward f3 against the moving force of the spring 22 or the weight 25 of the external force applying means, and the external force applying means acts on the work w. The pressing force of the grindstone 9 is maintained at an appropriate level.

While one of the contact between the work w and the grindstone 9, the work rotating shafts 27 and 28 are rotationally driven by a servomotor 29, and the work w is rotationally displaced around a specific center p and the peripheral edge is ground. Becomes

At this time, if information for grinding the entire periphery of the work w is input to the computer numerical controller, the servomotor 29 continuously rotates the work rotating shafts 27, 28 in a fixed direction. If, for example, information for grinding only one side a is input to the computer numerical controller, the work rotating shafts 27 and 28 are moved to a certain angle range θ.
It operates to reciprocate within.

When the grinding of the work w proceeds in this way, the first-stage grinding is finally partially completed.
At the point where the grinding is completed, the grinding allowance b no longer exists and the work table 18 reaches the end point on the grindstone 9 side within the moving range of the front and rear guide track means 19, and the work w
Is no longer in pressure contact with the grindstone 9 and is no longer ground.

In this state, the sensing portion 30a of the sensor 30 is pressed by the protruding piece 31, and the sensor 30 detects this, and the detection signal is input to the computer numerical controller. Based on this input information, the computer numerical controller operates the servomotor 29 to quickly move the grindstone 9 to the next cutting point of the work w.

When the grinding at each stage is completed as described above and the grinding of all the points of the workpiece w is completed, in the final stage of the grinding, the sensor 30 generates detection signals at all the points. Input to the numerical controller. With this input, the computer numerical control device recognizes that the required grinding has been completed, and returns each part to the initial state.

In the above example, the case where the position of the grindstone 9 is not changed during the grinding has been described. However, depending on the grinding mode, it may be necessary to vertically displace the grindstone 9 during the grinding.
In this case, similarly to the other servomotors 14, 17, and 29, the servomotor 5 for the grindstone 9 is controlled by the computer numerical controller.

[0030]

According to the present invention, when the grindstone presses the work, the work table moves backward on the support table against the moving force applied by the external force applying means. Regardless of the size, the pressing force of the whetstone acting on the work will be maintained at an appropriate level,
Therefore, smooth and stable grinding can be performed without considering the material and properties of the work and the grindstone, and the work is quickly rotated and moved at the point where the grinding is completed on the work to efficiently perform the grinding. Grinding can be performed.

According to the third aspect, even a work having a complicated shape can be efficiently ground. According to the fourth aspect, when a part around the work is ground, the work can be ground. Is reciprocated within a required angle range of 360 degrees or less, thereby enabling efficient grinding without wasteful operation.

[Brief description of the drawings]

FIG. 1 shows a grinding machine according to an embodiment of the present invention, wherein A is a plan view and B is a side view.

FIG. 2 is an operation explanatory view showing a part of the grinding machine.

FIG. 3 is a view showing a workpiece processed by the grinding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 5, 14, 17, 29 Servo motor 9 Grinding wheel 10 Support table 18 Work table 19 Guide track means 22, 25 External force applying means 26 Work holding and rotating means 27, 28 Work rotating shaft 29 Servo motor 30 Sensor w Work

Claims (4)

[Claims] 1. A grindstone which is rotationally driven on a base, and a support table which is displaced back and forth and left and right by a servomotor at a position related to the grindstone, and a worktable is formed on the support table by the worktable. Along with the guide track means being oriented, the work piece is provided so as to be freely displaceable with a certain dimension, and a work holding / rotating means for rotating the work around a certain axis by a servo motor is provided on the work table,
Further, an external force applying means for applying a moving force of an appropriate magnitude for displacing the worktable to the grinding wheel side within the displacement range of the guide track means is provided, and the worktable is moved within the displacement range of the guide track means. An automatic grinding machine provided with a sensor for detecting that it is located at an end point on the side of the grinding wheel. 2. The automatic grinding machine according to claim 1, further comprising a computer numerical controller that receives the detection signal of said sensor and controls a servomotor. 3. The automatic grinding machine according to claim 1, wherein the grinding wheel is vertically displaced by a servomotor controlled by a computer numerical controller. 4. A workpiece rotation axis of a workpiece holding and rotating means,
4. The automatic grinding machine according to claim 1, wherein the reciprocating displacement is performed within a certain angle range around a certain axis by a forward / reverse rotation operation of a servo motor as required.