JP2022091304A - Machining program creation device of wire electric discharge machine, machining program creation method and wire electric discharge machining system - Google Patents

Abstract

To provide a machining program creation device of a wire electric discharge machine which can properly collect a core even if the core is split, and also provide a machining program creation method and a wire electric discharge machining system.SOLUTION: A machining program creation device of a wire electric discharge machine in the present invention comprises: an input part for inputting machining shape data indicating a shape of a machining groove of a workpiece, and a shape of a core which forms an inside portion of the machining groove; a claw part selection part for acquiring a shape pattern of a claw part for fixing the core into the machining groove, dimension data of the claw part, and addition data indicating a position to which the claw part is added; a correction shape data creation part for creating shape data of the claw part by machining the shape pattern, and creating correction shape data in which the shape data of the claw part are added to the machining shape data; and a machining program creation part for creating a machining program for performing electric discharge machining on the basis of the correction shape data.SELECTED DRAWING: Figure 1

Description

The present invention relates to a machining program generator, a machining program generation method, and a wire electric discharge machining system of a wire electric discharge machine capable of preventing the split core from falling.

Wire electric discharge machining is widely known, in which electric discharge machining is performed by generating electric discharge between the electrodes formed between the machined electrode and the work, and is applied to jigsaw-shaped cutting with a wire electrode for a work such as a plate. .. In such wire discharge processing, it is necessary to collect the core, which is the inner portion of the work separated by the processing groove, during processing. Therefore, a method of sucking the core and lifting it upward to take it out (Patent Document 1). ) Or a method of pressing and collecting the core from above (Patent Document 2), or cutting the part left uncut to the end or the part where the core and the work are adhered to prevent falling, and the core. (Patent Document 3, Patent Document 6) and the like are used.

In the above-mentioned recovery method, when the weight or volume of the core cut out from the work is large, it is difficult to lift or press the core well by a removing device or the like, and the core cannot be properly recovered from the work. Was occurring. Therefore, a method is used in which a core having a large weight or volume is divided into a plurality of pieces in advance and the divided cores are removed in order (Patent Documents 4 and 5).

Japanese Patent No. 6599532 Japanese Unexamined Patent Publication No. 2019-181637 Japanese Unexamined Patent Publication No. 08-025144 Jikkenhei 05-002823 Gazette Japanese Unexamined Patent Publication No. 02-167621 Japanese Patent No. 5813517

However, when the cores after division are removed in order, the unremoved cores move inside the machining groove due to the jet of the machining fluid, etc., and enter the space created by removing another core from the work. It ends up. If the unremoved core moves freely inside the machined groove, there is a problem that the wire electrode is pinched between the cores or between the core and the work, resulting in disconnection. Further, there is a problem that the core cannot be properly removed by a recovery device or the like because the position of the unremoved core is displaced.

The present invention has been made in view of the above problems, and is a machining program generator and machining program generation of a wire electric discharge machine capable of appropriately recovering cores even when the cores are divided and processed. It is an object of the present invention to provide a method and a wire electric discharge machining system.

The machining program generator of the wire discharge processing machine of the present invention has an input unit for inputting machining shape data indicating the shape of the machining groove of the work and the shape of the core forming the inner portion of the machining groove, and the core. A claw portion selection unit for acquiring the shape pattern of the claw portion for fixing to the machined groove, dimensional data of the claw portion, and additional data indicating the position where the claw portion is to be added, and the claw portion by processing the shape pattern. A modified shape data generation unit that generates modified shape data by adding the shape data of the claw portion to the processed shape data, and a processing program for performing discharge processing based on the modified shape data. It is characterized by having a machining program generation unit for generating.
Further, the processing program generation method of the wire discharge processing machine of the present invention includes an input process for inputting processing shape data indicating the shape of the processing groove of the work and the shape of the core forming the inner portion of the processing groove, and the core. The claw portion selection step for acquiring the shape pattern of the claw portion for fixing to the processing groove, the dimensional data of the claw portion, and the additional data indicating the position where the claw portion is added, and the claw portion selection step for processing the shape pattern and the claw. A claw portion shape data generation step for generating the shape data of the portion, a modified shape data generation step for generating the modified shape data in which the shape data of the claw portion is added to the processed shape data, and a discharge based on the modified shape data. It is characterized by having a machining program generation step of generating a machining program for performing machining.
Further, the machining program generation device of the wire electric discharge machine of the present invention is characterized in that the modified shape data generation unit divides the core based on the processed shape data and generates the modified shape data.

Here, the machined shape data is data representing the shape of the machined groove (shape of the core), which is the target shape of the work performed on the work, and is, for example, CAD data.
Further, the shape data of the claw portion is data such as a 3D model or a set of position coordinates obtained by processing a shape pattern such as a 3D model showing the basic shape of the claw portion by dimensional data such as enlargement, reduction, and rotation.
Further, the machining program is data used when machining a work by wire electric discharge machining, and specifically, NC data.
According to the present invention, since the claw portion can be automatically provided on the work or the core by the machining program generation device and the generation method, the movement of the core is prevented even when the core is divided. It is possible to prevent the wire electrode from being broken and to appropriately remove the core by a simple method.

The present invention is a wire electric discharge machining system including a machining program generator and a wire electric discharge machine, wherein the wire electric discharge machine reads the machining program transmitted from the machining program generator and performs the above-mentioned machining at the time of rough machining. It is characterized by being provided with a control device that controls to perform an electric discharge machining that separates the core from the work while forming the claw portion according to a machining program.
Further, the wire electric discharge machining system of the present invention is characterized in that the control device controls the machining groove to be machined while removing the claw portion at the time of finishing machining.

According to the present invention, since the claw portion can be formed during rough machining and the claw portion can be removed during finishing machining in wire electric discharge machining, it is possible to automatically add and remove the claw portion, and further, the final step. It does not affect the shape of the product.

In the machining program generator of the wire electric discharge machine of the present invention, the position where the shape data of the claw portion is added is the position where the cores are in contact with each other.

According to the present invention, since the claws are provided at positions where the cores are in contact with each other, it is possible to omit the step of removing the claws at the time of finishing the wire electric discharge machining.

According to the present invention, it is possible to automatically and surely remove the divided cores during processing, and there are problems such as disconnection of the wire electrode due to the movement of the uncollected cores and the inability to properly collect the cores. It can be resolved.

It is an overall block diagram which shows the wire electric discharge machining system 100 of this invention. It is a block diagram which shows the structure of the machining program generation apparatus 20 of the said embodiment. It is a schematic diagram which shows the shape of the conventional core N and the machined groove G2. It is a schematic diagram which shows the shape of the core N and the machined groove G1 formed by the wire electric discharge machining system 100 of this invention. It is a flow chart which shows the outline of the whole operation of the wire electric discharge machining system 100 of this invention. It is a flowchart for demonstrating the method of generating a machining program by a machining program generator. It is explanatory drawing which shows the other shape of the claw part T formed by the wire electric discharge machining system 100 of this invention. It is explanatory drawing 2 which shows the other shape of the claw part T formed by the wire electric discharge machining system 100 of this invention. It is explanatory drawing 3 which shows the other shape of the claw part T formed by the wire electric discharge machining system 100 of this invention. It is explanatory drawing which shows the rough machining process and the recovery process of a core N performed by the wire electric discharge machine 10 of this invention.

(1.1 Overall configuration of wire electric discharge machining system 100)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of the wire electric discharge machining system 100 of the present invention. To explain the outline with reference to the figure, the wire electric discharge machining system 100 includes a wire electric discharge machine 10 and a machining program generation device 20.
The wire electric discharge machine 10 is composed of a machine main body 1, each axis motor 6 for driving the machine main body 1, a power supply device 7, and a control device 9, and the control device 9 is a machining program generation device 20. Is connected.

The machining machine main body 1 continuously supplies a wire electrode E as a tool electrode between the upper guide assembly 2 and the lower guide assembly 3, and places the work W on the work stand 5 in the machining tank 4. In this state, it is immersed in the machining fluid, and while the distance between the poles of the wire electrode E and the work W is set to a predetermined value by each shaft motor 6, a predetermined voltage is applied between the electrodes by the power supply device 7 to generate an electric discharge. It is configured to perform electric discharge machining of the work W.
Further, the processing machine main body 1 is provided with a core moving device 8 for collecting the core N. For example, the core moving device 8 includes a core suction holding portion having a permanent magnet or the like, and by attracting the cut out core N to the core suction holding portion, the core N is taken out from the work W and then the core N. Is collected in a core collection bucket (not shown) of the processing machine main body 1.

The control device 9 is a device that receives the machining program 90 from the machining program generation device 20, decodes it, and transmits a control signal. That is, the wire electric discharge machine 10 operates each axis motor 6 and the power supply device 7 according to the machining program 90 based on the control signal generated by the control device 9, and performs electric discharge machining.

FIG. 2 is a block diagram showing the configuration of the machining program generation device 20 of the above embodiment.
The machining program generation device 20 is a device that generates a machining program to be executed by the wire electric discharge machine 10 and transmits it to the control device 9. The machining program generation device 20 calculates the weight of the core N from the machining shape data 70, which is the machining shape of the actual product, performs data processing for dividing the core N into an appropriate number of divisions, and then further performs the claw portion. A machining program is generated by forming the modified shape data 80 in which the shape data 73 of T is combined.
The machining program generation device 20 includes an input unit 30, a display unit 40, a storage unit 50, and a processing unit 60.

The input unit 30 is composed of, for example, a keyboard, a mouse, a touch panel, or the like, and the processing shape data 70, which is information necessary for various processing, is input from the input unit 30 to the processing unit 60. The input unit 30 also includes a configuration in which various information is input from other devices via USB and LAN.

The display unit 40 is composed of a CRT display, a liquid crystal display, or the like, and displays information input from the input unit 30 and information processed by the processing unit 60. The display unit 40 displays drawing information based on, for example, the machined shape data 70 of the work W input by the operator via the input unit 30.

7 to 9 are explanatory views showing other shapes of the claw portion T formed by the wire electric discharge machining system 100 of the present invention.
The storage unit 50 is composed of a hard disk, a CD-ROM, or the like, and stores various data.
Data 51 showing the correlation between the weight of the core N and the number of divisions, density data 52 of the work W, shape pattern 53 of the claw portion T, dimensional data 54 of the claw portion T, and claw portion T are added to the storage unit 50. Additional data 55 representing the position to be used is stored.
The data 51 showing the correlation between the weight of the core N and the number of divisions is information indicating the optimum number of divisions of the core N with respect to the size of the total weight of the core N. The core moving device 8 calculates in advance from the mechanical performance and the like capable of adsorbing and collecting the core N, and stores the core N in the storage unit 50.
The density data 52 of the work W is the mass per unit volume of the work W to be machined, and is determined by the material of the work W. Therefore, the density data 52 is stored as a data table in which the material and the density are linked. Here, when the material of the work W is iron or the like and there is only one material of the work W to be handled, it is not necessary to store the density data 52 of the work W as a data table. It is also possible to use a unit volume weight instead of using the density data 52.
The shape pattern 53 of the claw portion T is data such as a 3D model showing the basic shape of the claw portion T and a set of position coordinates, and is, for example, a triangular cross section, a hook cross section (FIG. 7), or a trapezoidal cross section (FIG. 8). ) Etc. shape data. Further, the dimensional data 54 of the claw portion T is dimensional information of the claw portion T indicating the enlargement ratio, reduction ratio, rotation degree, etc. of the shape pattern of the claw portion T.
The shape pattern 53 of the claw portion T and the dimensional data 54 are linked and stored in the storage unit 50. When the operator manually inputs the dimension data 54, the dimension data 54 may not be stored in the storage unit 50.
The additional data 55 of the claw portion T is data indicating a position where the shape data 73 of the claw portion T is added to the processing shape data 70. For example, the addition position is a position where the processing groove G1 and the dividing line 72 described later intersect. Information such as the fact that the data is to be added and the position to be added is a position on the dividing line 72 is stored in the storage unit 50. When the operator manually inputs the position to be added, the additional data 55 may not be stored in the storage unit 50.

The processing unit 60 generates a processing program 90 based on the processing shape data 70 input from the input unit 30 and various data stored in the storage unit 50, and the storage data acquisition unit 61, the weight calculation unit 62, It is composed of a division calculation unit 63, a claw unit selection unit 64, a modified shape data generation unit 65, and a machining program generation unit 66.

The storage data acquisition unit 61 acquires various data stored in the storage unit 50.

The weight calculation unit 62 calculates the shape data of the core N from the processed shape data 70, calculates the volume of the core N, and also calculates the core based on the density data 52 of the work W acquired by the storage data acquisition unit 61. Calculate the weight of N.

The division calculation unit 63 calculates the number of divisions of the core N from the data 51 showing the correlation between the weight of the core N obtained by the weight calculation unit 62 and the weight of the core N and the number of divisions.

The claw portion selection unit 64 stores the shape pattern 53 of the claw portion T and the dimensional data 54 of the claw portion T to be used by inputting by the operator or referring to a preset set value by the storage data acquisition unit 61. Select from. Further, the claw portion selection unit 64 acquires the additional data 55 of the claw portion T from the storage unit 50 by the storage data acquisition unit 61.

The modified shape data generation unit 65 divides the core N from the information on the number of divisions of the core N calculated by the machined shape data 70 and the division calculation unit 63, and the claw portion T selected by the claw portion selection unit 64. The shape data 73 of the claw portion T is generated from the shape pattern 53, the dimensional data 54, and the additional data 55 of the above, and the modified shape data 80 to which the shape data 73 of the claw portion T is added is generated.
Specifically, the modified shape data generation unit 65 performs division processing, nail portion shape data generation processing, and modified shape data generation processing in this order.
In the division process, the shape of the machined groove G1 is extracted from the machined shape data 70, and the center of gravity 71 of the machined groove G1 is obtained. After that, by drawing an bisector centering on the center of gravity 71, the core N is divided into the number of divisions of the core N calculated by the division calculation unit 63. This bisector is referred to as a dividing line 72.
In the claw portion shape data generation process, processing such as enlargement, reduction, and rotation of the shape pattern 53 is performed along the dimensional data 54 of the claw portion T acquired from the claw portion selection unit 64, and the shape data of the claw portion T is performed. 73 is generated. Then, in the modified shape data generation process, the generated shape data 73 of the claw portion T is added to the processed shape data 70 according to the additional data 55 of the claw portion T to create the modified shape data 80.

The machining program generation unit 66 generates a machining program (NC program) based on the modified shape data 80 generated by the modified shape data generation unit 65.

(1.2 Overall operation of wire electric discharge machining system 100)
FIG. 5 is a flow chart showing an outline of the overall operation of the wire electric discharge machining system 100 of the present invention, and FIG. 10 shows a rough machining process and a core N recovery step performed by the wire electric discharge machine 10 of the present invention. It is explanatory drawing which shows. An outline of the overall operation of the wire electric discharge machining system 100 will be described with reference to the figure.
The machining program generation device 20 acquires the machining shape data 70, which is the machining shape of the actual product, via the input unit 30 (S1: input step). The machining program generation device 20 performs division processing and combination processing of the shape data 73 of the claw portion T on the machining shape data 70 to generate the modified shape data 80 (S2: modified shape data generation step). Then, the machining program 90 corresponding to the modified shape data 80 is generated (S3: machining program generation step).
After that, the machining program generator 20 transmits the machining program 90 to the wire electric discharge machine 10.
The control device 9 reads the machining program 90 transmitted from the machining program generation device 20 (S4), decodes it, and generates a control signal.
The control device 9 operates each axis motor 6 and the power supply device 7 by the generated control signal to perform rough machining on the work W (S5). In the roughing process, the hollowing process of dividing the core N and separating it from the work W while forming the claw portion T is repeatedly performed (S6, FIG. 10).
Each time the core N divided from the work W is separated, the core moving device 8 is driven, the divided core N is taken out from the work W, and the core N is collected in the core collection bucket (S7, FIG. 10).
In the middle of the roughing process, the claw portion T formed on the work W side and the divided core N engage with each other, so that the space C created by removing the core N from the work W is created. The uncollected core N does not move or fall, and remains inside the machined groove G1. Then, the roughing process is completed by repeating the roughing process and the core recovery process.
Whether or not the roughing process is completed is determined (S8), the roughing process is completed, and after all the divided cores N are recovered, the finishing process is executed (S9). In the finishing process, the processing groove G1 is finished to form the actual product shape. If necessary, the claw portion T provided on the work W side is removed (S10).
Then, it is determined whether or not the finishing process is completed (S11), and the execution of the processing program 90 is completed.

(1.3 Method of generating a machining program of the machining program generator 20)
FIG. 6 is a flowchart for explaining a method of generating a machining program by the machining program generation device 20.
The machining program generation device 20 acquires the machining shape data 70 via the input unit 30 (S1). The machined shape data 70 may be input by an operator's operation, or may be connected to a CAD device (not shown) and input.
Then, the weight calculation unit 62 calculates the shape data of the core N from the processed shape data 70, calculates the volume of the core N, and is centered based on the density data 52 of the work W acquired by the storage data acquisition unit 61. Calculate the weight of the child N. Further, the division calculation unit 63 calculates the number of divisions of the core N from the data 51 showing the correlation between the weight of the core N obtained by the weight calculation unit 62 and the weight of the core N and the number of divisions (S201).
After that, the claw portion selection unit 64 selects the shape pattern 53 and the dimensional data 54 of the claw portion T from the storage unit 50 by the storage data acquisition unit 61 from the selection of the operator or the setting information set in advance. Further, the additional data 55 of the claw portion T is acquired (S202: claw portion selection step).
Then, the modified shape data generation unit 65 extracts the shape of the machined groove G1 from the machined shape data 70, obtains the center of gravity 71 of the machined groove G1, calculates the dividing line 72 by calculating the bisector, and calculates the core. N is divided (S203). After that, processing such as enlargement, reduction, and rotation of the shape pattern 53 is performed along the dimensional data 54 of the claw portion T acquired from the claw portion selection unit 64 to generate the shape data 73 of the claw portion T (S204: Claw shape data generation process). Then, the generated shape data 73 of the claw portion T is added to the processed shape data 70 according to the information of the additional data 55 of the claw portion T to generate the modified shape data 80 (S205).
Finally, the machining program generation unit 66 generates the machining program 90 based on the modified shape data 80 generated by the modified shape data generation unit 65 (S3).

FIG. 3 is a schematic diagram showing the shapes of the conventional core N and the machined groove G2, and FIG. 4 is a schematic diagram showing the shapes of the core N and the machined groove G1 formed by the wire electric discharge machining system 100 of the present invention. It is a figure.
FIG. 4 shows an example of a machining shape in which the work W is actually machined by the machining program 90 generated by the above method. In the wire electric discharge machining system 100 of the present invention, when rough machining is performed, a claw portion T for fixing the divided core N at the same time as forming the machining groove G1 is formed on the work W or the core N (S6). ). By providing a plurality of claw portions T, the core N after division and the claw portion T are engaged with each other, and even if the core N after division is partially recovered, the uncollected core N is the machined groove G1. Never move inside. Therefore, it is possible to solve problems (FIG. 3) such as disconnection of the wire electrode E due to the movement of the uncollected core N and the inability to properly collect the core N. Further, since the claw portion T is removed (S10) by finishing processing or the like and processed into the shape of the actual product, no additional step for removing the claw portion T is required.

As described above, since the divided core N is automatically and surely removed, the desired processing can be performed without the need for a worker's hand, and it is possible to realize complete unmanned operation. Become.
In the above embodiment, the case where the work W is processed in two stages of roughing and finishing has been described, but the work may be processed in more processing stages or only in roughing. The work of removing the claw portion T provided on the W side may be performed at any timing.
Further, in the present embodiment, the number of divisions of the core N is calculated by the division calculation unit 63 using the weight of the core N obtained by the weight calculation unit 62, but the number of divisions of the core N is calculated by the operator. May be set via the input unit 30. In that case, the weight calculation unit 62 and the division calculation unit 63 can be omitted.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various applications or modifications can be carried out as needed.

The wire electric discharge machine of the present invention can prevent the movement of the divided core during machining, and contributes to a dramatic improvement in machining efficiency.

E: Wire electrodes G1, G2: Machining groove N: Core T: Claw part W: Work C: Space 1: Machining machine body 2: Upper guide assembly 3: Lower guide assembly 4: Machining tank 5: Work stand 6: Each axis motor 7: Power supply device 9: Control device 10: Wire discharge processing machine 20: Processing program generation device 30: Input unit 40: Display unit 50: Storage unit 60: Processing unit 61: Storage data acquisition unit 62: Weight Calculation unit 63: Division calculation unit 64: Claw unit selection unit 65: Modified shape data generation unit 66: Machining program generation unit 70: Machining shape data

Claims (7)

An input unit for inputting processing shape data indicating the shape of the machined groove of the work and the shape of the core forming the inner portion of the machined groove, and the shape pattern of the claw part for fixing the core to the machined groove. The claw portion selection unit that acquires the dimensional data of the claw portion and the additional data indicating the position where the claw portion is added, the shape pattern is processed to generate the shape data of the claw portion, and the claw is added to the processed shape data. It is characterized by having a modified shape data generation unit that generates modified shape data to which the shape data of the unit is added, and a machining program generation unit that generates a machining program for performing discharge machining based on the modified shape data. A machining program generator for a wire discharge machine. The machining program generation device for a wire electric discharge machine according to claim 1, wherein the modified shape data generation unit divides the core based on the processed shape data to generate the modified shape data. A wire electric discharge machining system comprising the machining program generator according to claim 1 or 2 and a wire electric discharge machine.
The wire electric discharge machine reads the machining program transmitted from the machining program generator, and performs hollowing to cut the core from the work while forming the claw portion according to the machining program at the time of rough machining. A wire electric discharge machining system characterized by being equipped with a control device for controlling the wire electric discharge machining. The wire electric discharge machining system according to claim 3, wherein the control device controls to machine the machined groove while removing the claw portion at the time of finishing. The machining program generator for a wire electric discharge machine according to claim 1 or 2, wherein the shape pattern is a 3D model having a triangular cross section, a hook shape, or a trapezoidal shape. The machining program generation device for a wire electric discharge machine according to claim 2, wherein the position where the shape data of the claw portion is added is a position where the cores are in contact with each other. An input step for inputting machining shape data indicating the shape of the machined groove of the work and the shape of the core forming the inner portion of the machined groove, and the shape pattern of the claw portion for fixing the core to the machined groove. A claw portion selection step of acquiring additional data indicating the dimensional data of the claw portion and a position to add the claw portion, and a claw portion shape data generation step of processing the shape pattern to generate the shape data of the claw portion. A modified shape data generation step of generating modified shape data by adding the shape data of the claw portion to the processed shape data, and a machining program generation step of generating a machining program for performing discharge machining based on the modified shape data. A machining program generation method for a wire discharge machine having.

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