JPS59166461A - Device for positioning grindstone - Google Patents

Abstract

PURPOSE:To accurately position an electrocondutive grindstone, by insulating the grindstone, supporting it on a grindstone spindle stock and using a controller to detect an electric change based on the contact of the grindstone with a workpiece, to control the action of the grindstone and the workpiece. CONSTITUTION:A rigid electric insulator 4 is interposed between a grindstone spindle stock 1 and a machine body 2. An electroconductive grindstone 5 is pivotally supported so that it can be rotated and also be operated by a motor 3 for the grindstone spindle head 1. When motors 3, 9 for the spindle stock and a work table are to be operated through a controller 16 to position the grindstone 5 and a workpiece 7 relative to each other, switches 12, 15 are turned on to cause the grindstone and the workpiece to gradually approach each other. When the gap delta between the grindstone and the workpiece is made zero, they are electrically connected to each other. A detector 17 finds out their electric connection and sends a detection signal to the controller 16 to stop both the motors 3, 9 to complete the positioning. The switches 12,15 are then turned off for conventional grinding. This constitution enables accurate positioning and heightens the efficiency of work.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grindstone positioning device that detects the relative position of a grindstone and a workpiece by simple means and controls the operations thereof.

When grinding a workpiece with a grindstone, it is necessary to position both parts. If the positioning is insufficient, it will take a long time to cut the air, resulting in wasted work time. In the prior art, this positioning was performed visually or by using a sensor or the like. In the case of visual inspection, the positioning is usually done by gradually bringing the grindstone or workpiece closer to the other side, making light contact and checking for sparks to be produced. Therefore, it requires skill, requires a lot of manual labor, and has the disadvantage of lowering work efficiency. In addition, automatic detection means such as sensors do not directly detect contact between the grinding wheel and the workpiece, but indirectly detect changes in the gap between them, changes in pressure, etc., and therefore accuracy may vary. It has the drawbacks of being economically inadequate and expensive. Of course, there are some that are fully automatic through numerical control, etc., but they have the disadvantage of requiring complicated control mechanisms and being expensive.

The present invention has been devised to solve the above-mentioned drawbacks.
The purpose is to provide a grindstone positioning device that can perform highly accurate positioning using simple means and improve work efficiency.

In order to achieve the above object, the present invention supports an electrically conductive grinding wheel insulated from the main body side, forms an electric circuit between the workpiece held on the main body side and the grinding wheel, and saves energy on both sides. The grindstone positioning device is configured such that a control device detects an electrical change in the electric circuit caused by the contact, and thereby controls the operation of the grindstone and the workpiece.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in the figure, a grinding wheel head main body (1) is movably supported on the main body side (2) and is operated by a grinding wheel head motor (3). Further, a rigid insulator (4) is interposed between the grindstone head main body (1) and the main body side (2).

The grindstone (5) is pivotally supported on the grindstone body (1) by a bearing (6) or the like, and is driven by a rotating means (not shown).

Further, the grindstone (5) is formed by containing a material having electrical conductivity, and is formed to be electrically conductive as a whole. This electrically conductive grindstone (5) is a known one.

- the workpiece (7) to be ground is held on a table (8) provided on the main body side (2);
is operated by a table motor (9). Although the figure does not show the means of movement in the direction perpendicular to the page,
The grindstone head main body (1) or the table (8) is configured to be operated by a motor (not shown). A gap δ is formed between the outer periphery of the grindstone (5) and the workpiece (machined surface).

On the other hand, a grindstone (5) and a workpiece (circuit 01 having power supply OQ) are formed. This circuit 01) is connected to the grinding wheel head main body (1) via switch 02, or to the slip ring αa that engages with the grinding wheel shaft (1 group) that supports the grinding wheel (5) via switch fJ51. The control device α0 is connected to the circuit Ql) via the detector 0η, and is also connected to the grindstone motor (3) and the table motor (9) to control their operations. The detector αη is like an ammeter, and detects an electrical change in the circuit aυ when the gap δ becomes zero, and outputs the signal to the control device αe.

Next, the functions and effects of this embodiment will be explained.

The control device (161) controls the grinding wheel head motor (3).
and the table motor (9), and operate to position both of them at their normal relative positions. This operation is performed by a normal operating circuit.

Next, switch α2 or OQ is turned on. However, since a gap δ is formed between the grindstone (5) and the workpiece (force), no current is generated in the circuit αυ.

At the moment when the two gradually approach each other and the gap δ becomes zero, the electrically conductive grinding wheel (5) and workpiece (7) are electrically connected, so the circuit αυ forms a closed circuit. do. The detector (1η detects this electrical change, sends the detection signal to the control device (IO), and the control device (Ie detects this electrical change).
) and the table motor (9) are stopped to complete the grindstone positioning. Thereafter, normal grinding is performed by predetermined operating means.

Note that the above-mentioned change in operation from stop to normal grinding is performed by a normal control means provided inside the control device α0.

In this embodiment, positioning is performed by detecting the moment when the grindstone (5) directly contacts the workpiece, so that the positioning accuracy is extremely high. Further, even if the grindstone (5) is worn out, its accuracy is not affected. Furthermore, since the above-mentioned operation does not require manual labor at all, no special skill is required and work efficiency can be improved. Further, the existing control device +16) can be used as is, and a simple means of simply inputting a signal of an electrical change in the circuit αυ is sufficient, so that it can be manufactured at low cost.

Of course, the present invention is not limited to the grinding apparatus of the above embodiment, but is similarly applicable to other grinding apparatuses such as ordinary external and internal grinding apparatuses and forming grinding apparatuses.

As is clear from the above description, according to the present invention, it is possible to achieve high-precision positioning and improve the work efficiency using inexpensive and simple means.

[Brief explanation of the drawing]

The figure is a configuration diagram showing the configuration of an embodiment of the present invention.

Claims (1)

[Claims] A grindstone that has electrical conductivity and is supported while being insulated from the main body side;
a control device that detects electrical changes in a circuit formed between the workpiece held on the main body side and the grindstone, and controls the operation of the grindstone and the workpiece based on the detection signal; A grindstone positioning device characterized by comprising: