JPS5851060A - Article feeding apparatus in duplex-head grinder - Google Patents

Abstract

PURPOSE:To permit articles to be worked to be fed into a grinding wheel continuously and in high speed without installing a pushing-in device by allowing the articles to be pushed into a conveyance guide rails in succession in the attracted state by an electromagnetic force, in feeding into a duplex-head grinder. CONSTITUTION:The articles 2 to be worked which is supplied from a feeding guide rails 1 is attracted in weak excitation by the electromagnet 9 placed in the supply part A. As an electromagnetic chuck 3 is in revolution, the articles 2 are attracted one by one in succession. The attracted articles 2 is transferred into the transportation part B, where the electromagnet 9 holds the article 2 in strong excitation. Then, the article 2 is transferred into the feeding-in part C, where the electromagnet 9 is switched into weak excitation or stop of excitation. The article 2 is abutted onto the inlet of a transportation guide rails 5, stripped- off from the attracted surface, and transferred to the transportation guide rials 5, and then supplied between grinding wheels 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for feeding a workpiece to a grinding wheel in a single-head grinding machine.

A double-headed grinding machine rotates a pair of grinding wheels with their grinding surfaces facing each other, and a workpiece conveyance guide rail (hereinafter simply referred to as conveyed object guide rail) is installed between the grinding wheels. This is a machine tool that processes the workpiece while passing it through the guide. Therefore, opposing surfaces of the workpiece can be simultaneously ground.

In order to automatically sequentially process a large number of workpieces using such a double-headed grinder, a device for automatically feeding the workpieces between the grinding wheels, a round feed device, is required.

The conventional feeding device is designed to feed the object by pinching it with pelt rollers that are provided opposite to each other on both the left and right sides of the extended guide rail. Since the conveyed object guide rail is installed to pass between the grinding wheels, it is thinner than the workpiece. Therefore, if the workpiece is thin, the belt rollers will not be sufficient to hold the workpiece, and the belt Since the rollers are deflected as they rotate, there have been problems such as the rollers falling off the conveyed object guide rails.

In addition, with conventional feeding devices, it was very difficult to change the setup, and it was difficult to feed the workpiece at high speed.

However, according to such a method, it is necessary to control the posture of the workpiece so that the workpiece is tightened with a chuck. Also,
When the workpiece is easily deformable, such as a small or thin object, the chuck device needs to be more precise and smaller, which is disadvantageous in terms of manufacturing time and cost.

Therefore, one object of the present invention is to provide a feeding device that can automatically and continuously feed a workpiece without the need for posture control and pushing devices, and furthermore, without the need to provide a particularly precise chuck device. purpose.

The present invention will be described in detail below based on illustrated embodiments. 1st
The figure is a schematic diagram showing the configuration of a feeding device according to the present invention.

First, we will explain the general operation of this neck mount. In Figure 1,
A workpiece 2 that is guided and supplied by a workpiece supply guide rail (hereinafter simply referred to as a supply guide rail) 1 is sequentially moved to a local adsorption surface 9 in the adsorption 1in4 of an electromagnetic chuck 3.
A is attracted one by one at the receiving part A with a weak suction force. The attracted workpiece 2 is fed to the feeding section C via the feeding section B as the electromagnetic chuck 3 rotates (in the direction of the arrow).

In the feeding section B, the workpiece 2 is sucked up with strong suction force,
In the feeding section C, the suction force is weakened.

The workpiece 2 that has reached the feeding section O is successively peeled off from the suction surface 4 at the entrance of the conveyance guide rail 5 and is fed between the grindstones 6.7. The force for feeding the workpiece 2 is generated by the pressing force when successive workpieces are placed on the entrance of the conveyance guide rail 5.

Next, the workpiece 2 is ground between the grindstones 6 and 7 and sent out from the exit of the conveyance guide rail 5.

Next, the configuration will be explained. The magnetic chuck 3 includes a rotating body 8 that is rotationally driven and a plurality of individually independent electromagnets 9 embedded in the rotating body 8 as basic components. The electromagnets 9 are embedded in the rotating body 80 at appropriate intervals in the circumferential direction. Further, each electromagnet 9Fi is provided so that its respective attracting surface is flush with one side of the rotating body 8, so that each electromagnet 9Fi is provided on one side of the upper rotating body 8.
A local adsorption surface 9A corresponding to the above is formed.

The above-described attraction surface 4 is apparently roughly divided into a receiving section A, a forwarding section B, and a sending section C depending on the strength of the magnetic field generated by each electromagnet 9. That is, the receiving part A is a part for first attracting the supplied workpiece 2 to the attracting surface 9A, and the magnet 9 is weakly excited when it is located (-! or passing through) this part. The reason for using weak excitation is that if strong excitation is used, the workpieces 2 and suction surface 9AK may be attracted rapidly and may be damaged, and the minimum required amount is required to individually attract each workpiece 2 one by one. This is to generate suction force. By doing so, the workpieces 2 can be reliably fed one by one.

The feeding section B is a section for transferring the workpiece 2 picked up by the receiving section A to the entrance of the conveyance guide rail 5. Therefore, the electromagnet 9 located in this forwarding section B is strongly excited to prevent the workpiece 2 from detaching.

The feeding section C adsorbs the workpiece 2 transferred via the feeding section B [
This is the part for transferring from 1i4 to the entrance of the conveyance guide rail 5. Therefore, the electromagnet 9 located in the feeding section C is provided with the necessary power so that the workpiece 2 can easily separate from the suction surface 9A, and also to send the preceding workpiece placed on the conveyance guide rail 5 forward. A moderately weak magnetic field is present. That is,
The existence of a weak magnetic field means that, depending on the thickness of the workpiece 2, it is a magnetic field generated by actively weakly excitation, or it is due to residual magnetism remaining on the I & surface A when excitation is stopped. Excitation switching of zero or more electromagnets 9, which means that a magnetic field is present, is performed by the following configuration.

That is, the electrode plate 1 provided on the back of the electromagnetic chuck 3
1, and a plurality of electrodes 12A, 12B, 120.12I) provided on the surface of the electrode plate 11 facing the electromagnetic chuck.

This is done with brushes 13 and 14 extending from each electromagnet 9 so as to be able to come into sliding contact with these electrodes (see FIG. 4).

In addition, in FIG. 4, in order to simplify the explanation, only the electromagnets 9 in the receiving section A, the feeding section B, and the sending section C are shown.

The electrode plate 1 is fixed while the electromagnetic chuck 3 rotates.

Each electrode 12A to 12D is supplied with an excitation voltage from the excitation power supply device 15 according to each role of the receiving section A11, the sending section B, and the sending section C. That is, a low voltage is applied to the receiving part electrode 12B, a high voltage is applied to the sending part electrode 12B, and a low voltage or zero voltage is applied to the sending part electrode 120. The outermost electrode 12D is a common electrode.

A voltage is applied between this electrode 12D and each electrode 12m to 12C. Therefore, ↑Brush 13°1 of electromagnet 9
It is arranged so as to be in sliding contact with the 4Fi common electrode 1211 and each of the electrodes 12-120.

Next, the operation will be explained (see FIGS. 2 and 4).

The workpiece 2 supplied by the supply guide rail 1 is attracted by the electromagnet 9 located in the receiving section A with weak excitation.

At this time, since the electromagnetic chuck 3 is rotating, the workpieces 2 are successively attracted one by one.Then, the attracted workpieces 2 are sent forward. At this time, the brushes 13 and 14 of the electromagnet 9 come into contact between the electrodes 12B and 12I), so the workpiece 2 is attracted by strong excitation and held securely. Ru. At this time, since the brushes 13 and 14 are in contact between the electrodes 120 and 12D, the electromagnet 9 is switched to weak excitation or excitation stop. and,
The workpiece 2 comes into contact with the entrance of the conveyance guide rail 5, and as the electromagnetic chuck 3 continues to rotate, it is peeled off from the suction surface and transferred to the conveyance guide rail 5, and in the same manner, subsequent workpieces are 2 is fed in, the workpieces on the conveyance guide rail 5 are sequentially pushed forward and enter between the grinding wheels 6 and 7.

According to the present invention, the workpiece is conveyed to the grinding wheel continuously and at high speed without the need for a pushing device, since the device sequentially feeds the workpiece to the conveyance guide rail while being attracted by electromagnetic force. can be provided. In addition, the attraction is based on electromagnetic force, and the receiving part uses weak excitation to attract it, so even small or thin workpieces can be reliably fed without falling off the rails, unlike conventional methods. This contributes to improving product quality.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a schematic perspective view of an embodiment of the workpiece feeding device according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof.
FIG. 4 is a front view showing the configuration of the excitation switching device. l... Supply guide rail, 2... Workpiece, 3...
Electromagnetic chuck, 5... Conveyance guide rail, 6... Grinding wheel, 7... Grinding wheel, 8... Rotating body, 9... Electromagnet, 9... Local adsorption surface, 11...・Electrode plate, A・
... Receiving section, B... Forwarding section, C... Sending section.

Claims (1)

[Scope of Claims] A double-headed grinding machine equipped with a pair of grinding wheels arranged in parallel and a workpiece conveyance guide rail passing between the grinding wheels, comprising a plurality of individually independent electromagnets. By providing these on the rotating body at intervals in the circumferential direction of the rotating body, a suction surface capable of locally suctioning the workpiece is formed on one side of the rotary body, and the suction surface is the receiving part and the one-way feeding part. an electromagnetic chuck roughly divided into a feeding section, the electromagnetic chuck having an entrance of the workpiece conveyance guide rail along the feeding section; The workpiece supply guide rail is vertically arranged, and each of the electromagnets is weakly excited in the suction surface receiving part, strongly excited in the forwarding part, and weakly excited or de-energized in the feeding part to respectively increase the suction force. A workpiece feeding device in a double-head grinding machine equipped with an excitation switching device for changing excitation.