JPS599295B2 - Balitorikakousouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to mechanical processing of metal, such as drilling, cutting, cutting, etc.
The present invention also relates to an improvement in an apparatus for processing and removing burrs generated on the sides, edges, ridges, welds, etc. of a workpiece during casting, forging, welding, etc.

Traditionally, the removal of this type of burr was done manually,
In rare cases, this is done by machine, but the work efficiency is low and the finish is poor, making it a bottleneck in mass production. In view of this point, deburring by electrolytic processing has already been proposed. In this electrolytic deburring process, a small, usually rod-shaped electrode is brought close to the burr-generating part of the workpiece, and electricity is applied to it in the presence of an electrolyte to remove the burr by anodic dissolution. When burrs are dispersed in multiple locations, the electrode must be moved closer to each location, making the work difficult. The present invention is designed to easily remove burrs scattered at multiple locations on a workpiece in one step, and the electrode has a total shape that is the same as or 10 similar to the entire machined surface of the workpiece. Electrodes are used for machining, and electrical discharge machining is used for machining.

The present invention will be explained below with reference to the drawings of one embodiment.

In Fig. 1, reference numeral 1 denotes a mounting jig for the workpiece, and burrs 2a, 2b, 152c, etc. are formed in multiple places by machining on this jig.
The workpiece 2 in which ... has occurred is fixedly placed.
Reference numeral 3 denotes an electrode having the same general shape as the entire machining surface of the workpiece 2, which is provided facing the workpiece 2, and is supplied with water, oil, etc. from the machining fluid supply port 4 by a pump device (not shown). The dielectric processing liquid is supplied and is configured to be branched and jetted into the processing gap portion from a plurality of liquid jet holes 3a, 3b, 3c, .

When mass-producing products in practical processing, as shown in Fig. 2, the workpiece 225 attached to the jig 1 is attached to the belt conveyor 5, and deburring is performed sequentially as the belt 5 moves. do.

One electrode 3 is attached to a rotating head 6 for tool exchange, and is selectively used for tool exchange each time it wears out or in response to changes in the shape of the workpiece 2. Although not shown, the rotary head 6 is equipped with a servo feed device for vertical movement and gap control, and the machining gap between the electrode 3 and the workpiece 2 is controlled to always maintain a small constant gap. be done. Further, the machining fluid is also jetted out from the electrode 3 through the rotating shaft of the rotary head 6 . T is a machining pulse power source that generates electrical discharge between the electrode 3 and the workpiece 2. 8 is an inspection device inserted into the energizing circuit of the pulse power source, which is designed to judge the machining state by detecting the machining current.The deburring process is performed using a total mold selected according to the shape of the workpiece 2. The electrode 3 is mounted on a belt conveyor 5 to face the workpiece 2 that has been sent directly below the electrode, and while being servo fed, a constant minute gap is maintained, and the jet holes 3a, 3b, 3 of the electrode are placed there.
Processing fluid is supplied in jet form from c..., and the pulse power source 7
Processing is performed by applying pulse current from .

Unlike electrolytic machining, electric discharge does not occur simultaneously over a wide machined surface, but instead generates a pulsed discharge in the shortest gap of the entire machined surface, and this discharge causes convex parts to When the discharge point is removed by machining, the next pulsed discharge is generated at a different convex part.The machining is performed by moving the discharge point in a pulsed manner, and the machining gap formed between the general electrode and the workpiece is When burrs are scattered at multiple locations, pulsed discharge is generated while moving to the scattered burrs, and by repeating the discharge, all the scattered burrs can be easily removed by machining. Since the passing burr is in the form of a line or foil, it is processed from the tip, and as the tip of the burr is removed by processing, the servo follows the electrode 3 and narrows the gap, so that the burr is removed all the way to the root. However,
Until all of this burr is removed by machining, electrical discharge will only occur on the protruding burr part, and no electrical discharge will occur on the workpiece part that has been processed and formed into the desired shape other than the burr. Prevented. The current during this deburring process is detected and determined by the inspection device 8. While the discharge is occurring in the burr area, the machining area is small and the current flowing is minute, but as the machining progresses, the surface of the workpiece When all the more protruding burrs are removed and the full electrode and the entire surface of the workpiece come to face each other with a constant minute gap, the electrical discharge current also increases rapidly. By presetting the discrimination reference value in the inspection device 8, it is possible to easily determine the completion of the deburring process based on a rapid change in the detection signal.At this time, the electrode 3 is raised to widen the gap and the belt The conveyor 5 moves and feeds the workpiece 2, positions the next workpiece directly under the electrode, and performs the burr removal process again in the same manner as before.This operation is repeated to remove a large number of workpieces one after another. We carry out production and processing. In addition, if the shape of the workpieces that are sequentially sent by the belt conveyor 5 is different from the previous one, the rotary head 6 for tool exchange is rotated in accordance with the moving feed of the belt comparer 5 to change the shape of the workpiece to be processed. All you have to do is select full-form electrodes that have the same shape as the body and process them one after another. Then, vertical movement of the electrode 3 for each processing, selective exchange (tool exchange) of a predetermined total type electrode corresponding to the shape of the workpiece, jetting of machining fluid, starting and stopping of energization, and processing of the workpiece using a belt conveyor. A series of steps for mass production, such as taking out the workpiece and moving and setting the new workpiece to be processed, can be completed by using an NC control device (not shown) in combination with processing completion detection by the inspection device 8. It can be done automatically and efficiently.

As mentioned above, unlike the conventional deburring process, deburring is performed using a full-form electrode, so deburring occurs at multiple locations on 2, 4, or 6 surfaces of a workpiece with a complex shape. The burrs can be easily and precisely removed in one process, and since electric discharge machining is used for machining, while burrs are present, the workpiece can be machined without wasting the machined surface. Since a device is provided to determine whether the burrs have been completely removed from the entire workpiece, it is possible to perform highly accurate deburring while maintaining the accuracy of the workpiece.

Also, during the deburring process, the parts of the workpiece where burrs are present (especially the edge parts of the workpiece) are hardened due to the rapid heating and cooling action of the electric discharge, so the workpiece is, for example, a breath type. Processing such as this allows heat hardening treatment to be performed simultaneously with burr removal, which has the effect of increasing mold life. Note that an appropriate inspection device that inspects the voltage, resistance, impedance of the machining gap, high frequency generated by electric discharge, etc. as a signal can be used as the inspection device for the machining state.

[Brief explanation of drawings]

FIG. 1 is a partial configuration diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing its entire configuration.

Claims (1)

[Claims] 1. A full-form electrode that has the same or similar shape over the entire machining surface of a workpiece that has burrs in multiple locations, and a servo feeder that feeds the full-form electrode into a gap facing the workpiece. , determining completion of machining and removal of burrs from all of the workpieces based on a pulse power source that repeatedly discharges by applying pulses to the opposing gap, and a signal detected from a pulse supply circuit of the pulse power source or from the opposing gap; A deburring processing device comprising an inspection device.