JP5096717B2 - Work fixture and work machining method - Google Patents

Description

  The present invention relates to a workpiece fixture and a workpiece machining method for setting a workpiece to be machined by a die-sinking electric discharge machine on the machining machine.

  Conventionally, in order to attach a plurality of workpieces to a die-sinking electric discharge machine, as shown in FIGS. 5 (a) and 5 (b), a workpiece 101 is placed on a magnet table 103 so that a tool electrode does not interfere with an adjacent workpiece. Each unit is attached with an interval L. Here, the workpieces 101 are set according to the reference frame 102 one by one. However, since the magnetic force of the magnet table 103 is weak, there is a possibility that the workpiece 101 moves with the machining pressure during machining. Therefore, the workpiece 101 may be fixed by the adhesive 104. In this case, it takes time to remove the adhesive 104 after processing. Further, in order to set machine coordinates for each workpiece 101, it is necessary to measure the position of the workpiece 101 on the magnet table 103, which is troublesome. Moreover, if the workpiece | work 101 is attached and processed for every piece, the up-and-down operation | movement of a tool electrode must be performed for discharge | emission of a processing waste for every piece, and working time will become long.

  Further, depending on the size and shape of the work, a precision vise 105 as shown in FIGS. 6A and 6B is used. The precision vise 105 is for attaching a plurality of workpieces 101 together, and includes a base portion 108 and a movable portion 110. The base portion 108 has a horizontal surface 106 and a front surface 107, and the movable portion 110 is a pressing surface. 109, which is movable along the horizontal plane 106 and is fixed at a position where the workpiece 101 placed on the horizontal plane 106 is sandwiched between the front surface 107 of the base portion 108 and the pressing surface 109. As a means for fixing the movable part 110, the hook part 111 of the base part 108, the holding screw 112, and the female screw part 113 are provided. A groove 114 is provided in the horizontal surface 106 of the base portion 108 so as to allow the holding screw 112 to pass therethrough.

  When the workpiece 101 is fixed using this type of precision vise 105, in the case of a minute workpiece, a spacer 115 corresponding to the thickness and number of workpieces is installed on the horizontal plane 106 so that the workpiece is not buried in the groove 114. There is a need. Further, when aligning the plurality of workpieces 101 on the spacer 115, since there is no reference surface for the side surface of the workpiece 101, a skill is required to align the side surfaces even if vertical accuracy can be ensured. Further, when the workpiece 101 is mounted off from the vicinity of the center of the front surface 107, the right angle accuracy of the movable portion 110 is deteriorated.

  Moreover, as a workpiece fixture for a die-sinking electric discharge machine to which a small workpiece is attached, for example, a workpiece fixture shown in Patent Document 1 is known. This work fixture has a horseshoe-shaped frame shape, and has a semi-circular bar and a rectangular plate inside the frame, and holds a small work between the bar and the plate. .

However, in the workpiece fixture shown in Patent Document 1, a plurality of workpieces cannot be set, and each workpiece must be attached to the workpiece fixture. Therefore, the workpiece is set in the die-sinking electric discharge machine. It takes time and effort.
JP 2001-113430 A

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a workpiece fixture and a workpiece processing method capable of easily mounting a plurality of workpieces with high accuracy.

In order to achieve the above object, a first aspect of the present invention is a work fixture for setting a work to be machined by a die-sinking electric discharge machine to the same machine, a lower base portion having a horizontal plane, and a perpendicular to the horizontal plane. An upper base portion having a front surface, a horizontal surface and a side surface perpendicular to the front surface, a pressing surface facing the front surface, and being held by the upper base portion and moving along the horizontal surface and the side surface A movable movable base part, wherein the horizontal plane, the front face, and the side face are used as reference surfaces for mounting the work, the work is sandwiched between the front face and the pressing face, A movable base pressing part that presses the movable base part against a workpiece and presses the front end of the movable base part against the back surface of the movable base part in order to sandwich and press the movable base part toward both the front surface and the side surface. Ne And a holding member having one end portion and a holding width adjusting pin that is rotatably locked in any of a plurality of holding portion adjustment holes provided in the upper base portion, and the movable base portion is The workpiece is clamped by being pressed by the pressing member.

According to a second aspect of the invention, in the work fixture of claim 1, wherein the lower base portion, which incorporates a magnet, the magnet is obtained so as to adsorb the workpiece to the horizontal plane.

According to a third aspect of the present invention, in the work fixture according to the first or second aspect, the upper base portion can be separated from the lower base portion.

A fourth aspect of the present invention is a workpiece machining method using a die-sinking electric discharge machine, wherein the workpiece is attached to the workpiece fixture according to any one of claims 1 to 3 , and the workpiece attachment step. Set the work fixture with the workpiece attached to the machining table of the Die-sinker EDM, measure the position of the workpiece fixture set by the setting process, and input the measurement data to the EDM In a state where the position measuring step, the machining step for machining the workpiece by the die-sinking electric discharge machine based on the data input by the position measuring step, and the dimensions of the workpiece machined by the machining step are attached to the workpiece fixture And a dimension measuring step to be measured.

According to the first aspect of the present invention, a plurality of workpieces can be attached along the three reference planes of the horizontal plane, the front surface, and the side surface, so that the workpiece can be attached to the workpiece fixture with high accuracy. In addition, since a plurality of workpieces can be attached together, a plurality of workpieces can be processed at the same time with the tool electrode corresponding to the plurality of workpieces, and the machining dimensions of the plurality of workpieces can be measured quickly. In addition, most of the work setting work can be performed without using a die-sinking electric discharge machine. Further, since the movable base part is pressed toward both the front surface and the side surface, and it becomes difficult for a plurality of workpieces to be released from the side surfaces, the workpiece can be attached to the workpiece attachment tool with high accuracy.

According to the second aspect of the present invention, when the workpiece is attached, the workpiece is attracted to the horizontal surface of the lower base portion by the magnet and does not fall from the workpiece fixture, and the workpiece can be easily set on the workpiece fixture.

According to the invention of claim 3 , since the upper base portion can be separated from the lower base portion in a state where the workpiece is attached to the upper base portion, the workpiece is processed without damaging the lower base portion in that state. Can be performed.

According to the invention of claim 4 , since the work fixture is set on the die-sinking electric discharge machine in a state where the workpiece is attached along the three reference planes of the work fixture, the position measurement of the workpiece can be easily performed. The workpiece can be processed with high accuracy and high efficiency.

  A workpiece fixture according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows an external appearance of a die-sinking electric discharge machine on which a work fixture according to this embodiment is set. The die-sinking electric discharge machine 1 includes a table portion 11 and a head portion 12, and a work fixture that holds a work (not shown) is set on the table portion 11. The head part 12 has a tool electrode 13, and the tool electrode 13 moves up, down, left and right to process a workpiece.

  FIG. 2A shows the configuration of the work fixture 2, and FIG. 2B shows a state where a plurality of workpieces 4 are set on the work fixture 2. The work fixture 2 includes a lower base portion 22 having a horizontal surface 21 and an upper base portion 25 having a front surface 23 perpendicular to the horizontal surface 21 and a side surface 24 perpendicular to the horizontal surface 21 and the front surface 23. The upper base portion 25 is joined to the lower base portion 22 by a base fixing screw 26. The upper base portion 25 holds a movable base portion 28 having a pressing surface 27 facing the front surface 23, and the movable base portion 28 is movable along the horizontal surface 21 and the side surface 24. The upper base portion 25 is provided with a movable base pressing portion 29 that presses the movable base portion 28 against the workpiece 4. The movable base pressing part 29 is pivotally locked by a clamping width adjusting pin 34 at one end in any of a plurality of pressing part adjusting holes 32 provided in the upper base part 25. A screw hole 30 is provided at the other end of the movable base holding part 29, and a holding screw 31 passes through the screw hole 30, and its tip abuts against the back surface of the movable base part 28. The lower base portion 22 includes a magnet 33 inside. The movable base pressing part 29, the pressing screw 31, the pressing part adjusting hole 32, and the clamping width adjusting pin 34 constitute a pressing member that presses the movable base part 28 toward both the front surface 23 and the side surface 24.

  Operation | movement of the workpiece fixture 2 which concerns on this embodiment comprised as mentioned above is demonstrated. The workpiece 4 is placed on the lower base portion 22 with the horizontal surface 21, the front surface 23, and the side surface 24 as reference surfaces, and a plurality of workpieces 4 can be attached together. Since the lower base portion 22 includes a magnet 33 therein, the workpiece 4 is attracted to the lower base portion 22 by a magnetic force and can be easily attached without being dropped. The movable base portion 28 is moved along the horizontal surface 21 and the side surface 24 toward the front surface 23, the pressing surface 27 is pressed against the workpiece 4, and the workpiece 4 is held between the front surface 23 and the pressing surface 27. One end of the movable base pressing portion 29 is pivotally locked to the pressing portion adjustment hole 32 by a clamping width adjustment pin 34. The presser screw 31 is tightened to press the movable base portion 28 toward both the front surface 23 and the side surface 24, and the work 4 is fixed to the work attachment 2. Since it becomes difficult for a plurality of workpieces to be released from the side surface 24, the workpiece 4 can be attached to the workpiece fixture 2 with high accuracy. In addition, since the movable base pressing part 29 can be locked in the pressing part adjusting hole 32 according to the position of the movable base part 28, the work 4 can be quickly fixed to the work mounting tool 2.

  Since there is no groove in the horizontal surface 21 of the lower base portion 22, the work 4 can be easily attached to the work fixture 2 without being buried in the groove even if the work 4 is small. Moreover, although the workpiece | work 4 is attached to the workpiece fixture 2 and set to the table part 11, since the mass of the workpiece fixture 2 is large, it attracts | sucks strongly to the magnet table of the table part 11, and is strongly attracted | sucked, and adhesives Eliminates the need for fixing. Since no adhesive is used, there is no need to wait for the adhesive to harden, and there is no need to remove the adhesive after processing, so the processing time can be shortened.

  Since a plurality of workpieces 4 can be attached to the workpiece fixture 2, most of the setting work of the workpiece 4 to the die-sinking electric discharge machine can be performed without using the electric die-sinking machine. It becomes easy to perform automatic processing of the processing machine. Even when a plurality of workpieces 4 are attached, the horizontal plane 21, the front surface 23, and the side surface 24 are used as reference planes, so that the workpiece 4 can be set accurately, and the position of the workpiece 4 in the workpiece fixture 2. Therefore, it becomes easy to measure the three-dimensional data of the position of the workpiece 4, and errors in the machining data of the die-sinking electric discharge machine 1 in CAD / CAM are reduced. Moreover, since the several workpiece | work 4 is attached collectively, machining time can be shortened by using the tool electrode of the shape which processes the several workpiece | work 4 at once. Further, after processing, the workpiece fixture 2 is removed from the table portion 11 and measured. However, since a plurality of workpieces 4 can be measured together with the workpiece fixture 2 attached thereto, the measurement can be performed quickly.

  Next, separation of the upper base portion 25 from the lower base portion 22 will be described with reference to FIG. FIG. 3A shows the configuration of the upper base portion 25 separated from the lower base portion 22 while the workpiece 4 is sandwiched, and FIG. 3B shows the configuration of the lower base portion 22. By removing the base fixing screw 26 (see FIG. 2), the lower base portion 22 and the upper base portion 25 can be separated. And the upper base part 25 is isolate | separated from the lower base part 22 in the state which clamped the workpiece | work 4, and the workpiece | work 4 can be processed in the state. For example, if a through hole is machined in the workpiece 4 in the direction of arrow A, the lower base portion 22 is damaged when the upper base portion 25 and the lower base portion 22 are joined, but the upper base portion 25 is replaced with the lower base portion 22. If it isolate | separates from, the through-hole can be processed in the workpiece | work 4 without damaging the lower base part 22. FIG.

  Next, the usage method in the die-sinking electric discharge machine 1 of the workpiece fixture 2 is demonstrated with reference to FIG. FIG. 4 shows a flow of a method for using the workpiece fixture 2. First, as described above, a plurality of workpieces 4 are set on the workpiece fixture 2 (S1). This step S1 constitutes a work attachment process. Next, the work fixture 2 is set on the table portion 11 of the die-sinking electric discharge machine 1. If there is a reference frame or the like that serves as a position reference in the table unit 11, the table 11 is set based on the reference frame or the like (S2). This step S2 constitutes a setting process.

  Subsequently, the position of the workpiece on the table unit 11 is measured, and the data is input to the die-sinking electric discharge machine 1 (S3). This step S3 constitutes a position measurement process. When the workpiece 4 is set on the table portion 11 without using the workpiece fixture 2, the position must be measured for each workpiece 4. However, when the workpiece 4 is set on the workpiece fixture 2, the workpiece 4 is set. Since the position on the workpiece fixture 2 is determined, only the position of the workpiece fixture 2 may be input to convert the data in the die-sinking electric discharge machine 1. If the work fixture 2 is set based on the reference frame on the table unit 11, data corresponding to the reference frame may be input. Since it is easy to input 3D data at the position of the workpiece 4, data errors are reduced.

  Subsequently, machining is performed by the die-sinking electric discharge machine 1 based on the input position data (S4). This step S4 constitutes a machining process. The plurality of workpieces 4 can be processed at once by the tool electrode 13 corresponding to the plurality of workpieces 4. Subsequently, the dimension of the workpiece 4 after processing is measured (S5). This step S5 constitutes a dimension measuring process. Measurement is performed with the workpiece fixture 2 removed from the table portion 11, but since a plurality of workpieces 4 can be collectively measured while being attached to the workpiece fixture 2, the measurement can be performed quickly. Thus, the workpiece can be machined with high accuracy and high efficiency by the above-described machining method.

  In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, the upper base part 25 and the lower base part 22 may be an integral body that cannot be separated. Moreover, as a pressing member, it is not restricted to the structure of the said embodiment.

The external view of the die-sinking electric discharge machine which sets the workpiece fixture which concerns on embodiment of this invention. (A) is a perspective view of the workpiece fixture which concerns on embodiment of this invention, (b) is a perspective view of the workpiece fixture which attached the workpiece | work. (A) is a perspective view of the upper base part which concerns on the embodiment, (b) is a perspective view of a lower base part. The flowchart of use of the workpiece fixture which concerns on embodiment of this invention. (A) is a top view of the workpiece | work set to the conventional magnet table, (b) is a right view of the workpiece | work. (A) is a top view of the conventional precision vice, (b) is a front view of the same precision vice.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Die-sinker electric discharge machine 11 Table part 2 Work fixture 21 Horizontal surface 22 Lower base part 23 Front surface 24 Side surface 25 Upper base part 27 Pressing surface 28 Movable base part 29 Movable base pressing part (pressing member)
31 Holding screw (holding member)
32 Presser part adjustment hole (presser member)
33 Magnet 34 Holding width adjusting pin (pressing member)
4 Work

Claims (4)

In the work fixture for setting the work to be processed by the die-sinking electric discharge machine to the same machine,
A lower base portion having a horizontal plane;
An upper base portion having a front surface perpendicular to the horizontal plane and a side surface perpendicular to the horizontal plane and the front surface;
A movable base portion having a pressing surface facing the front surface, held by the upper base portion, and movable along the horizontal plane and side surfaces;
The horizontal surface, the front surface, and the side surface are set as a reference surface for workpiece attachment,
Sandwiching a workpiece between the front surface and the pressing surface, sandwiching the workpiece between the upper base portion and the movable base portion ,
In order to press the movable base part toward both the front surface and the side surface, a movable base pressing part that presses the movable base part against a work, and a holding screw whose tip abuts against the back surface of the movable base part, A holding member having a holding width adjusting pin whose one end is pivotally locked to any of a plurality of holding portion adjusting holes provided in the upper base portion;
A work fixture , wherein the movable base part is configured to sandwich a work by being pressed by the pressing member . The lower base portion has a magnet inside,
The work fixture according to claim 1, wherein the magnet attracts the work to the horizontal plane. It said upper base portion, the workpiece fixture according to claim 1 or 2, characterized in that it can be separated from the lower base portion. A workpiece attachment step of attaching a workpiece to the workpiece fixture according to any one of claims 1 to 3 ,
A setting step of setting a workpiece fixture to which a workpiece is attached by the workpiece attachment step on a machining table of a die-sinking electric discharge machine;
A position measuring step of measuring the position of the work fixture set by the setting step and inputting measurement data to the die-sinking electric discharge machine;
A machining process for machining a workpiece by a die-sinking electric discharge machine based on the data input by the position measurement process,
A dimension measuring step of measuring a dimension of the workpiece machined by the machining step in a state of being attached to a workpiece fixture, and a workpiece machining method using a die-sinking electric discharge machine.

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