JPH01310822A - Wire-cut electric discharge machining method - Google Patents

Abstract

PURPOSE:To prevent occurrence of repeated severances at the same processing point by relieving the discharge processing conditions into a condition where it is hard for the wire to be severed, when the frequency of wire severance exceeds a certain level while one block is undergoing electric discharge processing. CONSTITUTION:When a plurality of blocks are produced from one work by means of electric discharge processing, the frequency of wire severance shall be counted. When the counted number exceeds a certain value during processing of one block (Step 13), the frequency of severance is cleared (Step 16), and the processing conditions are mitigated (Step 17) into conditions in which it is harder for the wire to be severed. This followed by automatic wiring (Step 15), and the processing is continued. This mitigation of processing conditions prevents severance repeatedly at the same processing point to lead to enhancement of the processing efficiency.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a wire cut electric discharge machining method.

[Prior Art] In a conventional wire-cut electric discharge machine, when a wire is broken, a guide is moved to a point designated by a code, automatic wire connection is performed, and processing is performed again from the broken position.

In addition, in conventional electric discharge machines, if the arc stops or a short circuit occurs and machining cannot be continued, machining is temporarily stopped and the machining is restarted after removing the cause of the short circuit. .

[Problem to be Solved by the Invention] In the conventional device, when automatic wiring is performed after wire breakage, the automatic wire connection itself is successful, but if the condition of the processing point is poor, the wire may break at the same point many times. The problem is that it is easy.

Furthermore, if the arc is stopped due to displacement of the workpiece just before cutting off, there is a problem in that the machining efficiency is significantly reduced.

The present invention prevents wire breakage or arc h at the same processing point many times.
It is an object of the present invention to provide a wire-cut electrical discharge machining method that can prevent the occurrence of lumps.

[Means for Solving the Problems] The present invention is an electric discharge machining method for machining a plurality of blocks from one workpiece. When the number of wire breakages during machining is equal to or greater than a predetermined number, the electrical discharge machining conditions are relaxed to make wire breakage less likely.

In addition, the present invention stops electrical discharge machining of the block being electrically discharged when the number of disconnections is equal to or greater than a predetermined number, and then automatically connects the wire at the initial hole of the block to be electrically machined next and starts electrical discharge machining. It is something to do. Furthermore, in the present invention, when the arc is stopped during electrical discharge machining of the block, the electrical discharge machining of the block being electrically discharged is stopped, and the electric discharge machining is performed by automatically connecting wires at the initial hole of the next block to be electrically discharge machined. This is the start of the process.

[Function] In the electric discharge machining method for machining a plurality of blocks from one workpiece, the present invention counts the number of times the wire breaks during electric discharge machining of the block, and performs electric discharge machining of one block. Sometimes, when the number of wire breaks exceeds a predetermined number, the electrical discharge machining conditions are relaxed to prevent wire breakage, or the electrical discharge machining of the block being electrically machined is stopped, and the wires are automatically connected at the initial hole of the block to be electrically machined next. Since the electrical discharge machining is started after the first step, it is possible to prevent wire breakage from occurring many times at the same machining point. Furthermore, the present invention provides that, if the arc stops while electrical discharge machining is being performed on a block described in 2, the electrical discharge machining of the block being electrical discharge machined is stopped, and the wires are automatically connected at the initial hole of the block to be electrically discharge machined next. Since electric discharge machining is started, it is possible to prevent arc stop from occurring many times at the same machining point.

[Example] FIG. 1 is a flowchart showing an example of the present invention.

First, various initial settings are performed, and electrical discharge machining is performed based on the initial settings (Sl). If the wire breaks during the processing (S2), it is determined how many times the wire breaks, and if the number of wire breaks is less than 5 (S2)
3), increase the number of disconnections by 1 (S4). Then, automatic wire connection is performed (S5), and the above processing is repeated.

On the other hand, when a disconnection occurs, if the number of disconnections is more than 5 (S3), clear the number of disconnections (constant) (S6),
The guide is moved to the initial hole of the block next to the block currently being machined (the shape next to the shape currently being machined) (S7), automatic wire connection is performed (S5), and the above process is repeated.

Note that the number of disconnections in S3 may be set to a number other than five. In addition, the number of disconnections can be determined by counting the number of disconnections using a predetermined counter.
·do.

As described above, when the number of disconnections exceeds a predetermined number, the machining efficiency is improved when a plurality of blocks are removed from a workpiece by moving to the initial hole of the next shape.

FIG. 2 is a flowchart showing another embodiment of the invention.

First, perform the initial settings and start machining.S 11)
, if there is a disconnection (S12), the number of times the disconnection occurs is determined (S13). If the number of disconnections is 5 or less,
Set the number of wire breaks to +LL (S14) and perform automatic wire connection (S1
5) Repeat the processing.

On the other hand, if the number of disconnections is 5 or more in S13, clear the number of disconnections (316) and relax the processing conditions (316).
-317). In other words, conditions are set so that the wire is difficult to break. Then, automatic wire connection is performed (S15) and processing is continued.

Examples of relaxing the machining conditions in S17 include lowering the machining speed, lengthening the pulse off time, and increasing the servo voltage, but other relaxing conditions may also be adopted.

As described above, when the number of wire breaks exceeds a predetermined number, by relaxing the processing conditions, the wire becomes less likely to break and the processing efficiency improves.

Note that the number of disconnections in S3 and S13 may be set to a number other than five. Further, the number of disconnections is counted by a counter.

FIG. 3 is a flowchart showing another embodiment of the present invention.

First, perform the initial settings and start machining (521). If an arc stop occurs (S22), cut the wire (523), then proceed to the block next to the block currently being machined (the next block of the shape currently being machined). Move the guide to the initial hole (shape of 524) and perform automatic wiring (S
25), repeat the processing.

If arcs) or blobs occur due to the workpiece that is about to be cut off, there is no need to temporarily stop machining and remove the short-circuiting element. By cutting and moving to the next shape, the machining efficiency of the entire electrical discharge machining operation will be improved.

Only one embodiment from among the embodiments shown in FIG. 1, FIG. 2, and FIG. 3 may be applied to a wire-cut electric discharge machine, and two or three of them may be applied in advance. However, different parameters may be assigned to each embodiment, and one of the parameters may be selected before performing electrical discharge machining.

Effect 1 of the Invention According to the present invention, it is possible to prevent wire breakage or arc stop from occurring many times at the same processing point.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing one embodiment of the present invention. FIG. 2 is a flow chart showing another embodiment of the invention. FIG. 3 is a flowchart showing another embodiment of the invention. Patent applicant Sodick Co., Ltd. Agent Arata Yokubo - Figure 2 Figure 3

Claims (3)

[Claims] (1) In an electrical discharge machining method for machining a plurality of blocks from one workpiece, a wire breakage counting stage is performed to count the number of times the wire is broken during electrical discharge machining of one of the blocks; A wire-cut electrical discharge machining method comprising: a step of relaxing electrical discharge machining conditions to a state where electrical discharge machining conditions are less likely to cause wire breakage when the number of wire breakages is equal to or greater than a predetermined number. (2) In the electric discharge machining method for machining a plurality of blocks from one workpiece, a wire breakage counting step of counting the number of times the wire breaks while electric discharge machining one of the blocks; When the number of disconnections is greater than or equal to a predetermined number, the electric discharge machining of the block being electric discharge machined is stopped, and the electric discharge machining is automatically connected at the initial hole of the block to be electric discharge machined next, and the electric discharge machining is started. A wire cut electrical discharge machining method comprising: a control step; (3) In an electric discharge machining method for machining a plurality of blocks from one workpiece, an arc stop detection step of detecting that an arc has stopped while electric discharge machining a predetermined block; A wire cutting step of cutting the wire; and control for stopping electrical discharge machining of the block being electrical discharge machined when the arc is stopped, automatically connecting wires at the initial hole of the next block to be electrical discharge machined, and starting electrical discharge machining. A wire cut electrical discharge machining method comprising the steps of;