TW202114795A - The method of automatic core removal in wedm - Google Patents

Abstract

The core automatic removal method is a function of automatically removing the core of the wire-cut electrical discharge machine, and is suitable for driving the electromagnetic device fixed inside the machine head when the magnetically conductive workpiece is cut by wire electric discharge machining. The adsorption device catches the core and moves it to the waste box for collection. In particular, the size and shape factor of the core can be adopted, and the suction position of the core can be automatically determined, and the offset path and offset are automatically generated corresponding to the smallest core. The way of automatic core removal method is so that the cores of different sizes can be effectively caught and removed.

Description

Automatic removal method of wire cutting machine core

The method for automatically removing the core of a wire cutting machine of the present invention is applied to a wire-shaped electrode electric discharge machining system. When cutting metal materials by the wire cutting electric discharge machining method, it is applied to an electromagnetic adsorption device. For the core that can be completely cut and separated The part is to calculate the contour area and the position of the center of gravity of the shape for the control unit to automatically determine and select the removal method, which can be applied to the field of wire-cut electric discharge machine manufacturing mold processing. Since more than 90% of the molds in the manufacturing industry are made of magnetically permeable metal materials, it is particularly suitable for electromagnet adsorption devices to adsorb different shapes of cores and remove them to the collection device.

When the wire-cut electric discharge machine is used in the manufacture of stamping dies, the processed workpiece often has completely cut core waste. The contour shape of the core is usually a simple geometric figure, and the completely separable core will not be processed later. It is used and must be removed before subsequent processing to facilitate the smooth progress of subsequent processing procedures. Because when the manufacturing process is not fully automated, the method used in traditional processing will reserve a small processing path before cutting each core contour incompletely. After the cutting action of several cores is performed Many cores that are cut often need to be manually picked up and removed one by one, and the cores are manually removed from the workpiece, and finally the subsequent processing actions are performed, which is very labor-intensive and labor-intensive. The manufacturing process is a link that needs improvement. The cut and separated core waste can be eliminated by automated mechanisms, such as robotic arms, electromagnet suction devices, vacuum suction devices, etc., among which the most streamlined electromagnets are used for adsorption As far as the device is concerned, the contour shape of the core and the size of the adsorbed area are related to whether the core waste can be smoothly absorbed and eliminated. Different core shapes require different elimination strategies and methods. This is the method that the present invention can solve the problem. .

The method and device for removing the core in the conventional wire-cut electric discharge machine (WEDM), as disclosed in the specification of the Republic of China Patent No. TW M383460UI, a wire-cutting machine's waste detection mechanism uses a magnetic The sensor is connected to the axially reciprocating piston rod and is driven by oil, pneumatic cylinder or motor screw. When the wire cutting machine completes the cutting process of the workpiece, the automatic reclaiming mechanism will remove the cut waste When the waste material has been completely removed, the extension of the piston rod will cause the magnetic sensor to completely penetrate the processing part and extend until the sensor can sense the sensing part, and the sensor will send a signal to the wire cutting The control unit of the machine.

The magnetic sensor mechanism in the present invention is only used to detect whether the core waste is completely removed, and judge whether the magnetic sensor completely penetrates the processing part, and does not disclose when the automatic reclaiming mechanism removes the cut waste. , There are methods for automatic removal of cores of different shapes.

As disclosed in the specification of the Republic of China Invention Patent Publication No. TW 201736026A, the wire electrode melts a part of the shape to be processed during electrical discharge machining to produce a welded portion, and welds the cutout of the workpiece to the workpiece. The processing method is to fix a recovery part for recovering the cuts at the lower head. After the processing is completed, a separation part is pushed by the cylinder stroke to separate the cuts, and the holding part of the recovery part is located below the cuts. In order to hold the separated cutouts, the recovery part has a discharge member and a contact wall of the discharge member, and an outlet is opened relative to the bottom surface of the holding part, so that the holding part can discharge the cutouts. The recovery part can be fixed to the lower machine head, It can also be disassembled and installed when needed. When performing the removal processing, install the recovery part on the lower head, and then move the lower head and the recovery part, so that the holding part is located under the removal, and the removal is carried out. After the separation process, the lower handpiece and the recovery part are moved, and the discharge member slides to discharge the retained cutouts, and judge whether the cutouts are recovered. If so, move the lower handpiece so that the recovery part is located above the load-bearing part. The control unit raises the recovery part from the carrying part, and removes the recovery part from the lower machine head.

The control unit related to the automatic removal of excisions in this invention only reveals whether the cores are completely separated and whether the excisions are recovered for the automatic removal detection and judgment of excisions. It does not disclose the automatic removal of cores of different shapes. In addition to the method of operation.

In addition, as disclosed in the US Patent No. 5,365,030 , when a wire-cut electrical discharge machine is used to contour a workpiece, a first holding element composed of an electromagnet is used, and the first holding element is fixed to the second holding element The second holding element is then fixed to the upper wire guide block, and its function is to hold the core. Therefore, the first holding element can be freely loaded or removed from the second holding element. Therefore, before the core is completely cut, the first holding element can span the core and other workpiece parts to maintain the position of the core and other workpiece parts. Then, after the core is cut out, the first holding element is held on the second holding element. By raising and moving the second holding element, the core can be pulled out of the workpiece, and then the core can be transferred to the predetermined position. Using the simple device described above, the core processing operation can be performed quickly, stably, and automatically.

However, this invention does not disclose the method for removing cores with different contour shapes and areas, because the electrode wires of the wire cutting machine pass through the central circular hole of the first holding element for wire cutting electric discharge machining. For special contour shapes The core, or the area is smaller than the first Holding the core part of the central hole of the element will make it difficult to attract and pull out, which is related to the position arrangement of the first element of the electromagnet to absorb the core part.

In addition, as disclosed in the US Patent No. 5,556,554 , a wire-cut electric discharge machine and a method for automatically calculating the shape, number and arrangement of bridging members. This method is to allow the core to be fixed on the workpiece after the bridging member is cut. , Without interfering with adjacent cores, when multiple cores are to be removed from a single workpiece, it can ensure effective processing. The disclosed allowable machining program can automatically avoid the interference between the bridge member and the upper nozzle, and can automatically perform high-efficiency machining until the finishing machining is completed.

In this invention, a large number of ferromagnetic bridging members can be installed to hold the core on the workpiece. The bridging members can have different shapes to automatically calculate the weight and shape parameters of the core. They are arranged around the core. The calculation is based on The inclination of the core caused by the pressure of the dielectric sprayed by the upper nozzle and the lower nozzle, and the inclination of the core due to its own weight, keep the core in the original positional relationship, and judge the interference between the bridging member and the upper nozzle to ensure Perform subsequent finishing. However, it does not disclose the method and judgment of the automatic calculation and selection of the exclusion due to the position of the center of gravity of the core shape and the size of the area.

The present invention proposes a method for automatically removing the core of a wire cutting machine, which is mainly applied to the wire cutting electric discharge machining of magnetic metal materials. It is implemented by an electromagnet magnetic absorption device and equipment, which can automatically determine the size of the core The most effective position and action is to move the core part to the recovery device to remove it after being absorbed; especially for the tiny core part, it can be sucked in a special way. The CNC controller automatically takes the area size and shape factor of the core part, and then goes on the machine. The head drives the upper water cover to automatically offset a short path vector, so that the entire core and the adsorption device increase the contact area to increase the adsorption force, so even the tiny core waste can be smoothly absorbed and removed.

The method for automatically removing the core of the wire cutting machine of the present invention is a function that can be applied to the automatic core removal function of the online cutting electric discharge machine, and is suitable for when a magnetically conductive workpiece is processed by the wire cutting electric discharge machine, the controller automatically starts the machine The head drives the electromagnetic suction device to move the suction core to the waste box for collection. In particular, the area size and shape coefficient of the core can be adopted to automatically determine the position of the suction core, and the offset path is automatically generated for smaller cores. The offset movement method can effectively absorb and eliminate cores of various sizes.

20‧‧‧Upper head

21‧‧‧Water cover

22‧‧‧Core

23‧‧‧Workpiece

24‧‧‧Waste Box

25‧‧‧Working table

31‧‧‧Start

32‧‧‧NC program start and cut judgment

33‧‧‧Did you enter the distance before cutting?

34‧‧‧Switch cutting off processing parameters

35‧‧‧Judge whether it has been cut off

36‧‧‧Determine the core suction position

361‧‧‧Suck the starting point and the position of the center of gravity of the large core

362‧‧‧Suck the broken point of the small core

363‧‧‧Sucks tiny cores

3631‧‧‧Path offset

37‧‧‧Water spray under the machine head

38‧‧‧Successful absorption?

39‧‧‧Number of failures≧N

40‧‧‧Retry to draw

41‧‧‧Alarm stop

42‧‧‧The nose moves up

43‧‧‧Move to the top of the waste box

44‧‧‧Successful blanking

441‧‧‧Alarm stop

45‧‧‧End

46‧‧‧Micro core

47‧‧‧Water cover

471‧‧‧Water cover hole

48‧‧‧Water cover

The first figure is the outline drawing of various core parts in the method of the present invention

The second figure is a schematic diagram of the operation of the device implementing the method of the present invention

The third figure is the flow chart of the method of the present invention

The fourth diagram is a diagram of the path offset of the implementation device in the method of the present invention

When the method for automatically removing the core of the wire cutting machine of the present invention can be applied to the wire cutting electric discharge machining, the material to be processed is often a metal material with good magnetic permeability, such as SKD11. The core part that can be completely separated by the contour of the processing path is a kind of The core of recyclable waste can be automatically removed by the electromagnetic adsorption device. The best installation method of the electromagnetic adsorption device is to install it in the upper machine head. The outermost part of the upper machine head near the workpiece is magnetically permeable. The water cover device can be moved and removed directly by magnetically adsorbing the core. The shape of the core suitable for this electromagnetic adsorption device needs to be symmetrical, so that the core can be adsorbed to the center of gravity when the core is removed, and the success rate of the core removal is improved. The shape of the core is not suitable to be too complicated, so as not to be jammed during suction; or the core The center of gravity is outside the contour shape of the core. In the figure, the first figure is the outline drawing of various cores of the present invention. The various core shapes in the first figure (a) are suitable for automatic removal by electromagnetic adsorption devices, and the various cores in the first figure (b) Because the center of gravity is outside the contour shape of the core, it is not suitable for automatic elimination by the electromagnetic adsorption device. The shape factor is determined by the "center of gravity position of the contour shape" and the "angle of the contour included angle" of the core. The shape factor is provided by the CNC controller of the processing machine to automatically determine the core removal method.

The method of automatically removing the core of the wire cutting machine can realize an automatic function of the wire cutting electric discharge machine. As shown in the second figure, in the schematic diagram of the operation device of the method of the present invention, a workpiece (23) is fixed on the table plate (25) of the machine , This automatic function is used to process the inner hole to cut off the core (22) when blanking, the processing machine can automatically adsorb and transport the upper water cover (21) of the head (20) above the core (22) to the waste box ( In 24), the start signal is issued by the NC program of the CNC controller (not shown in the figure) of the processing machine, and the shutdown signal is also issued by the CNC controller to end the automation function.

As shown in the third figure is the flow chart of the method of the present invention, when (31) the controller NC program starts the cut-off judgment (32) signal, it will judge whether it enters the distance before cutting before the lead line segment of the inner hole machining path. ? (33), if it is, it will switch to the processing parameter (34) used when cutting the core. The processing parameter has a total array for selection. The processing parameter when cutting the waste material must be in order to avoid wire breakage during cutting. Use less energy and slower parameters when off. Carry out cutting core processing. After processing, judge whether the core has been cut (35). If not, return to the processing parameter (34) used when switching and cutting the core. Area size, shape coefficient, etc., to determine the core suction position (36). When the core area and shape coefficient belong to a larger part, the large core is automatically absorbed at the starting point or the center of gravity (361) ; When the area and shape coefficient of the core are small, for example, the core with a diameter of φ6 or less, the small core (362) will be automatically sucked at the breaking point; when The area and shape factor of the core are assigned to micro-small (363), for example, when the core diameter is 3 or less, the offset and path for sucking the micro core are automatically adjusted (3631). When you want to suck up the core, spray water (37) from the following machine head to push the core closer to the suction point with pressurized water, which can help the core suck. After the suction action is performed, judge whether the suction is successful (38), if not, judge whether the number of failures exceeds the set N times (39), when it is judged that the number of failures caused by the inability of the core to be sucked is not greater than the set N times, The machine can automatically repeat the attempt to suck again (40); when it is judged that the number of failures caused by the failure of the core to be sucked, if it is greater than the set N times and the core still cannot be sucked, an alarm will be issued to stop (41), and another suction will be carried out Treatment of core failure. Judge whether it is successful to suck up the core (38), if it is successful, automatically control the machine head to move up (42) the adsorbed core, and then move the adsorbed core to the top of the waste box (43) for blanking , And then judge whether the core blanking is successful (44); if not, an alarm is issued to stop (441); if the core blanking is completed, the automatic core judgment and removal method ends (45).

The fourth figure is a diagram of the movement path and offset of the implementation device in the method for automatically removing the core of the wire cutting machine of the present invention. The positional relationship between the upper water cover of the upper machine head and the core is shown in Figure (a). (46) The diameter is only ψ 3, which is smaller than the diameter ψ 4 of the central water cover hole (471) of the upper water cover (47) of the upper machine head, so it cannot be located at the central water cover hole (471) of the upper water cover (43) Suction, the suction of the tiny core (46) can be sucked up in a special way, as shown on the left in the figure (b), when the tiny core (46) is too small, the water cover (47) and the tiny core ( 46) The contact area is not enough to suck up the tiny core (46), as shown on the right side of the figure (b), the upper machine head drives the upper water cover (47) relative to the lower water cover (48), offset by a small amount The distance and the offset path are generated by the CNC controller automatically adopting the area size and shape factor of the core, start the path vector planning and move the upper machine head to the vector position, so that the entire tiny core (46) and the upper water cover ( 47) Increase the contact area to increase the adsorption force, so even the tiny core waste can be absorbed and eliminated smoothly.

The method for automatically removing the core of the wire cutting machine of the present invention is an automatic core removal function that can realize the automatic core removal function of the online cutting electric discharge machine, and is suitable for when a magnetically conductive workpiece is processed by electric discharge cutting, the above head drives an electromagnetic adsorption device , It can be sucked to the waste box for collection, especially the area size and shape coefficient of the core can be automatically judged, and the effect of effectively sucking and removing cores of various sizes can be achieved.

31‧‧‧Start

32‧‧‧NC program start and cut judgment

33‧‧‧Did you enter the distance before cutting?

34‧‧‧Switch cutting off processing parameters

35‧‧‧Judge whether it has been cut off

36‧‧‧Determine the core suction position

361‧‧‧Suck the starting point and the position of the center of gravity of the large core

362‧‧‧Suck the broken point of the small core

363‧‧‧Sucks tiny cores

3631‧‧‧Path offset

37‧‧‧Water spray under the machine head

38‧‧‧Successful absorption?

39‧‧‧Number of failures≧N

40‧‧‧Retry to draw

41‧‧‧Alarm stop

42‧‧‧The nose moves up

43‧‧‧Move to the top of the waste box

44‧‧‧Successful blanking

441‧‧‧Alarm stop

45‧‧‧End

Claims (9)

A method for automatically removing the core of a wire cutting machine. The method mainly includes the steps: starting the core cutting judgment by the NC program; judging whether the core has been cut? ; If yes, determine the core suction position, and determine the core suction position according to the area size and shape factor of the core; according to the result of the judgment, suction the core at the relative set position; judge whether the core has been suctioned successfully? If yes, move the sucked core to the waste box to perform core feeding. In a method for automatically removing the core of a wire cutting machine as described in item 1 of the scope of patent application, when the result of the judgment is that a large core is sucked, the core is sucked from the starting point. In the method for automatically removing the core of a wire cutting machine as described in item 1 of the scope of patent application, when the result of the judgment is that a large core is sucked, the core is sucked from the center of gravity position. In the method for automatically removing the core of a wire cutting machine as described in item 1 of the scope of patent application, when the result of the judgment is that the small core is sucked, the core is sucked by the broken wire. In the method for automatically removing the core of a wire cutting machine as described in item 1 of the scope of the patent application, the result of the judgment is that when a small core is sucked, a path deviation vector is generated, and the core is moved to the vector position to suck the core. In a method for automatically removing the core of a wire cutting machine described in any one of the scope of the patent application 2 to 5, the shape factor is determined by the position of the center of gravity of the contour shape and the angle of the contour included angle. As described in item 1 of the scope of patent application, in a method for automatically removing the core of a wire cutting machine, before the step of determining whether the core has been cut, it further includes a step of setting and switching to cutting processing parameters. For example, in the method for automatically removing the core of the wire cutting machine described in the first item of the scope of patent application, before the step of judging whether the core has been successfully absorbed, it further includes a water spray step on the head of the machine to absorb the core with pressurized water Push closer. For example, in the method for automatically removing the core of a wire cutting machine described in the first item of the scope of patent application, after the step of determining whether the core has been successfully sucked, if not, it is determined whether the number of sucking failures exceeds the set value, and does not exceed the set value Then retry the suction, and when the set value is exceeded, an alarm will be sent to stop the action.

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