JP2826786B2 - EDM method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machining method,
It is intended to improve machining efficiency in finish machining of electric discharge machining.

[0002]

2. Description of the Related Art Conventionally, finish machining by electric discharge machining is divided from rough machining to finish machining into dozens of machining processes, and machining is performed by setting machining conditions for each machining process. After that, the process proceeds to the next step. That is, the processing is divided into a plurality of processing steps such as rough processing, medium processing, and finishing processing, and the end position of each processing step is instructed by a processing program.

As shown in FIG. 5 as a flowchart,
Processing steps of start step NO and end step NO are set, and then processing conditions such as electric processing conditions, processing depth, electrode swinging conditions, and jump conditions are set.After starting processing, one of the specified processing steps is performed. It is determined whether or not the process has been completed. When the process is completed, the processing conditions for the next process are set, and the designated processing steps are sequentially repeated. Finally, it is confirmed that all the processes have been completed, and all the processes are completed.

That is, in each of the electric discharge machining steps, after confirming that the machining has been completed up to the instructed end position, the machining program of the next machining step is processed. Those corresponding to the processing steps are specified.

In electric discharge machining, when machining chips enter and short-circuits, a change in voltage between the work and the electrode causes a servo mechanism to operate, so that the electrode moves away from the work and then approaches again to continue machining. It is configured.

[0006]

When a workpiece is machined by swinging the machining electrode, as shown in FIG. 6, the final trajectories of the rough machining, the medium machining, and the finish machining are a and a, respectively. If b and c are assumed, for example, in rough machining, if machining is delayed due to a large machining amount or instability of electric discharge, etc., machining of a portion where the machining is delayed must be completed. Since it is not possible to proceed to the next medium machining, the machining completion portion is not processed and only idles, so that the machining time has to be long.

That is, it is not possible to proceed to the next processing until it is confirmed that each processing step has been completely processed, so that it takes time to complete all the processing. In particular, in the case of the so-called swinging processing which involves side processing while rotating in the XY plane, since the processed part also rotates, there is a useless rotating part in which processing is not performed, and it takes a very long time.

Further, in one machining process, electric discharge machining is performed only under designated machining conditions. Therefore, if large machining chips during rough machining enter the electric discharge machining portion during the finishing process,
Since only a relatively small discharge of machining energy for the finishing process is generated, it takes time to remove the machining waste.

To further explain, as shown in FIG. 6, the final position a of the rough machining is designated, the machining is performed until this is completed, and then the intermediate machining final position b is designated, and the machining is continued until this is completed. The processing is finally performed by designating the processing end position c.

In this case, when a partial machining delay occurs due to unstable discharge or the like, for example, when a machining locus indicated by A in FIG. 6 occurs, machining with the final position a where the machining delay occurs is performed. In order to machine the delayed portion, since the machining condition of the round machining is constant during the machining, the portion where the machining has been completed is left idle without being machined.

Therefore, not only needless processing time is required for each processing step, but also, at the end of each processing step, a work for confirming the end of processing is required each time the processing is completed. I had to be.

[0012]

According to the present invention, as shown in FIG. 3, for example, a final trajectory (finish processing final position) c and a processing condition switching trajectory (rough processing final position) a, (medium processing final position) By setting and instructing "b" and switching the machining conditions according to the position of the electric discharge machining electrode E with respect to the workpiece W, the disadvantage of the conventional apparatus is to be improved.

That is, the above-mentioned object is achieved by adopting the following configuration. Processing electrode
In the processing progress direction, and
Machining the workpiece while swinging in the vertical or three-dimensional direction
Machining, rough machining, medium machining, finish machining
Machining conditions stored in advance according to each machining process etc., each machining
Set the final machining position of the workpiece in the process, the storage
Reads and outputs the processed machining conditions and starts machining the workpiece.
The final processing position of the work in each of the processing steps set above
Detecting the position of the momentary working electrode with respect to the detection result
By the above, the final of the work in each set machining step
The next processing step is where the processing electrode reaches the processing position.
Reads and outputs machining conditions according to
There, the final machining of the workpiece at each processing step and the setting
If the processing electrode does not reach the position,
Continue with the machining of the workpiece in the processing conditions in accordance with the, also, processing
Does not progress, the processing electrode recedes, and
Return to a position before the final machining position
A discharge machining method for machining a workpiece by reading and outputting the corresponding machining conditions .

[0014]

According to the present invention, since there is no movement restriction for each machining step, machining is always carried out, there are no places where electric discharge machining is idling, and portions where machining is delayed have a high machining speed. Since processing is performed under conditions, it is possible to catch up with a processing state that is progressing quickly. (However, in the part that has reached the final machining locus, the machine will run idle until the end of machining.)

[0015]

1 is an electric discharge machining flowchart according to the present invention, FIG. 2 is an explanatory view showing the structure of an apparatus according to the present invention, and FIG.
FIG. 3A shows a relationship between a machining electrode and a workpiece, in which FIG. 3A is a front sectional view, and FIG. 3B is a plan view.

In the present invention, similarly to the prior art, up to the setting of the processing conditions in FIG. Although the position is instructed, the position of the machining electrode with respect to the final machining position of the workpiece is detected, and the machining condition corresponding to the detected position of the machining electrode is read out from the set and stored machining condition. It outputs a series of electric discharge machining to the last machining position of the commanded work . Immediately
The invention of the present application is a processing from one processing step to the next processing step.
Eliminates wasted time when advancing
For the purpose of providing a reduced electric discharge machining method,
Processing according to each processing step such as rough processing, medium processing, finish processing
The conditions are stored in advance, and the final processing
Set the machining position, read and output the stored machining conditions, and
Start machining of the workpieces, and
Position of machining electrode with respect to final machining position of workpiece
Processing the workpiece while detecting the position
The final machining position of the work in each set machining process
Where the processing electrode reaches the
Reads and outputs the processed processing conditions, processes the work, and sets
Machining power at the final machining position of the work
Where the poles have not reached, process according to the process
Processing of the workpiece is continued under the conditions, and
Electrode retracts and the final machining position of the workpiece in the pre-machining process
When returning to the previous setting, the processing conditions according to the pre-processing
Reads and outputs to perform EDM on workpieces
You.

That is, as shown in FIGS. 3A and 3B, after the start of machining, machining conditions of the discharge electrode E with respect to the workpiece W are set as follows.
The machining position is changed for each machining condition area reaching the machining end positions a, b, and c, and by checking the current position of the discharge electrode, machining progresses as shown in FIG. In the place where it has been reached, it is processed under the fine processing conditions of the next process, and at the position where the processing is delayed due to the unstable discharge and the difference in the processing amount between the electrode and the work,
It is configured so that high-speed processing is performed under the rough processing conditions of the previous process, and when all of the processing reaches the final processing final position, the processing is completed.

FIG. 2 shows the structure of the apparatus according to the present invention. In the drawing, Mx, My and Mz are feed motors for driving the respective feed screws, each having an encoder for detecting the feed amount. FIG. 4 is a table showing a processing table, showing an example of a processing step number, a processing condition NO, a processing amount, and the like. As shown in this machining process table, by instructing the machining start process NO and the machining end NO, the machining end process NO15
In other cases, the bottom surface remaining amount and the side surface remaining amount are automatically corrected according to the bottom surface gap and side surface gap data.

[0019]

According to the prior art, since the process proceeds to the next process after one process is completed, a situation where the machining is progressing may occur in an idle state,
Furthermore, it is necessary to confirm the end of processing for each processing step,
Further, when the processing is close to the finishing step, there is a disadvantage that the processing time becomes unstable due to disturbances such as processing chips, but in the present invention, the processing conditions are switched according to the electrode position, and each processing is performed. Since there is no movement restriction, processing is always performed under processing conditions corresponding to the electrode position, and therefore, processing time can be reduced.

[Brief description of the drawings]

FIG. 1 is an electric discharge machining flowchart according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an apparatus according to the present invention.

FIG. 3 shows a relationship between a machining electrode and a workpiece,
(A) is a front sectional view, and (b) is a plan view.

FIG. 4 is a table showing a processing table in the present invention.

FIG. 5 is a discharge machining flowchart according to a conventional example.

FIG. 6 is a plan view showing a relationship between a processing electrode and a work according to a conventional example.

[Explanation of symbols]

 a Final position of rough machining b Final position of medium machining c Final position of machining A Machining trajectory by electrode E Machining electrode W Work

Claims (1)

(57) [Claims] 1. A process electrode is sent in a processing progress direction.
In the vertical direction or the three-dimensional direction,
In electric discharge machining method for machining a workpiece while moving, roughing machining medium processing, corresponding to each processing step of the finishing process and the like
The conditions are stored in advance, the final processing position of the work in each processing step is set, and the stored processing conditions are read out and output to process the work.
Start and final machining position of the work in each of the set machining steps
The position of the machining electrode with respect to is detected, and based on the detection result, in each of the set machining steps,
Where the machining electrode reaches the final machining position of the workpiece
Reads and outputs machining conditions according to the next machining process, and
Performs processing of click, the final machining position of the workpiece at each processing step and the setting
If the machining electrode does not reach the
Continue the machining of the workpiece with Flip processing conditions, also processing retracts the working electrode does not proceed before the processing step
When returning to the position before the final machining position of the workpiece at
Read and output machining conditions according to the machining process to add workpieces.
Carry out the engineering, electrical discharge machining method which was characterized by a call.