JP3092491U - Electrode mounting jig - Google Patents

Abstract

(57) [Problem] To provide an electrode mounting jig which can be used by replacing a plurality of electrodes. SOLUTION: The collet 16 is processed with an accuracy (AA class) such that the runout width of the shaft 12a at a distance of 4d from an end face 16e of the collet 16 is 3 μm or less.
The collet holder 18 is formed so that the accumulated deviation of the central axis of the outer surface 16a, the central axis of the insertion hole 16b, the central axis of the collet holder 18 and the central axis of the storage hole 22a is 10 μm or less. The center of the mounting jig 10 and the center of the axis 12a of the electrode 12 sandwiched between the collets 16 can be made substantially coincident. Therefore, even when a plurality of electrodes 12 are replaced with one electrode mounting jig 10 and used, there is no fear that processing accuracy is impaired, and processing cost can be significantly reduced.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  In the present invention, for example, an electrode used for electric discharge machining is machined (cutting machine or electric discharge machine). Electrode mounting jig for mounting on a processing machine or the like).

[0002]

[Prior art]

  As one of the methods for processing irregular holes and complex surface shapes on processing objects such as metal plates The electric discharge machining method is widely known. In this processing method, first, the electrode (1) is formed into a predetermined shape ( For example, by cutting into a male shape of a processing target shape, and subsequently, as shown in FIG. (1) is brought close to the workpiece (3) immersed in the machining fluid (2) and the electrode (1) and the workpiece are machined. An arc discharge is generated between the target object (3) and this causes digging into the target object (3). It is designed to be processed.

[0003]   Then, in the conventional electric discharge machining method, as shown in FIG. The electrode mounting jig (4) is attached to the mounting part (5a) of the cutting machine (5), and the electrode mounting jig (4) The electrode (1) is cut based on the center A, and the processed electrode (1) and electrode mounting jig (4) And are integrated and transferred to the mounting part (6a) of the electrical discharge machine (6) so that electrical discharge machining can be performed. Was there.

[0004]

[Problems to be solved by the device]

  Conventionally, the electrode (1) and the electrode mounting jig (4) were integrated into an electric discharge from the cutting machine (5). Since it was designed to be transferred to the processing machine (6), there are as many electrode mounting jigs as there are electrodes (1) to be used. A tool (4) is required, and when processing a complicated shape using a large number of electrodes (1), There was a problem that the cost became too high.

[0005]   Therefore, as one means to solve this problem, one electrode mounting jig (4) It is conceivable to replace and use a plurality of electrodes (1), but as shown in FIG. Remove the electrode (1) from the machined electrode mounting jig (4) and chuck the other electrode (1). Then, due to the chucking accuracy, the center A ′ of the shaft (1a) of the electrode (1) and the electrode mounting jig (4) The center A deviates from the center A by B (usually 20 μm or more), and the machining accuracy in the electric discharge machine (6) There is a problem that is damaged.

[0006]   The present invention has been made in view of such a conventional example, and its purpose is chucking precision. The machining accuracy is reduced even if the electrode is replaced by greatly increasing the degree compared with the conventional method. It is an object of the present invention to provide an electrode mounting jig that can drastically reduce the processing cost.

[0007]

[Means for Solving the Problems]

  The invention described in claim 1 is "from the insertion end of the shaft (12a) of the electrode (12) to the other end" The tapering outer surface (16a) that gradually becomes thinner and the insertion hole (16b) from the insertion end to the other end The shaft (12a) of the electrode (12) inserted in the insertion hole (16b) from the surroundings. Formed to fit the outer surface (16a) of the collet (16) and collet (16). The storage part (22) having the storage hole (22a) and the storage part (22) at the insertion end side of the collet (16). The tightening nut (20) that is screwed onto the housing to secure the collet (16) to the storage (22), and the storage (2 Provided with a collet holder (18) having a mounting portion (24) for mounting 2) on the processing machine (14) In the electrode mounting jig (10), the central axis of the outer surface (16a) of the collet (16) and the insertion hole (16b) The central axis of the collet holder (18) and the central axis of the storage hole (22a). An electrode mounting jig (10), characterized in that the amount of protrusion is 10 μm or less. "so is there.

[0008]   In this device, the central axis of the collet (16), the central axis of the insertion hole (16b), the collet holder The accumulated deviation between the central axis of the da (18) and the central axis of the housing hole (22a) is 10 μm or less. Since it is made, the deviation of the central axis of the electrode mounting jig (10) is greatly reduced compared to the conventional one. Will be done.

[0009]

[Effect of device]

  According to this invention, the central axis of the collet (16), the central axis of the insertion hole (16b), the collet The accumulated deviation of the central axis of the holder (18) and the central axis of the storage hole (22a) is 10 μm or less. Since it is formed on a single electrode mounting jig (10), multiple electrodes (12) Even if it is used by replacing it, the electrode clamped between the center of the electrode mounting jig (10) and the collet (16). It is possible to make the center of the axis (12a) of the pole (12) approximately coincident (that is, 10 μm or less). .

[0010]   Therefore, replace multiple electrodes (12) with one electrode mounting jig (10). Even if there is, there is no concern about the processing accuracy being reduced, and the processing cost is greatly reduced. be able to.

[0011]

[Embodiment of device]

  FIG. 1 is a perspective view showing an electrode mounting jig (10) to which the present invention is applied. This electrode As shown in FIG. 2, the mounting jig (10) is provided with an electrode (12) such as a cutting machine or an electric discharge machine. The collet (16) and the collet holder (18) are for attaching to the processing machine (14). And a tightening nut (20).

[0012]   The collet (16) holds the shaft (12a) of the electrode (12) from the surroundings by tightening. As shown in 2, it is a tubular body having an insertion hole (16b) into which the shaft (12a) is inserted. this The outer surface (16a) of the contact (16) faces the other end from the insertion end of the electrode shaft (12a) in the axial direction. It is formed in a taper shape that gradually becomes thinner, and the outer diameter surface of the collet (16) on the large diameter side is The locking groove (16c) that engages with the locking inner collar (30b) of the tightening nut (20) described later extends all around. Is formed. Then, expand or contract the collet (16) on the side wall of the collet (16). A plurality of (16 in this embodiment) dividing grooves (16d) for insertion are provided from the insertion end to the other end. And in a zigzag pattern alternately from the other end to the insertion end. When the diameter of the socket (16) is reduced from the surroundings, the diameter is reduced uniformly around the center axis of the insertion hole (16b). Is configured to.

[0013]   Here, the central axis of the tapered outer surface (16a) of the collet (16) and the center of the insertion hole (16b) It is processed to match the axis, and its surface roughness is better than that of precision finishing. It is finished with precision. Thereby, when the collet (16) grips the electrode (12), Distance 4d from the end face of the collet (16) (16e = electrode shaft insertion end) (the diameter of the electrode shaft is (d)) The electrode shaft diameter (d) is 4 times), the shaft (12a) deflection width (= core) Shake can be 3 μm or less (AA-class accuracy).

[0014]   As shown in FIG. 2, the collet holder (18) includes a storage part (2) for storing the collet (16). 2) and the mounting part (24) that is mounted on the mounting part (14a) of the processing machine (14). It

[0015]   The storage section (22) has a cylindrical shape, and the internal space at the upper end of the storage section (22) is It is a storage hole (22a) for storing the collet (16). The inside surface of the storage hole (22a) It becomes thinner as going deeper so as to match the outer surface (16a) (tapered surface) of the let (16). Is formed in a tapered shape.

[0016]   Here, the taper angle formed by the inner surface of the storage hole (22a) and the central axis of the storage hole (22a) is , Is processed so that it is almost uniform over the entire circumference of the storage hole (22a). The surface roughness of the inner surface of the receiving hole (22a) is finished with accuracy higher than precision finishing. This Thus, when the collet (16) is stored in the storage hole (22a), the outer surface (16) of the collet (16) is a) central axis, insertion hole (16b) central axis, collet holder (18) central axis, and storage The cumulative deviation from the central axis of the hole (22a) is 10 μm or less (preferably 5 μm or less) be able to.

[0017]   A male screw (22c) is formed on the outer peripheral surface of the upper end of the storage section (22). And income A substantially rectangular connection part (22d) is formed at the lower end of the storage part (22), and this connection part (22d) is The mounting portion (24) is fixed by bolts or the like.

[0018]   The mounting part (24) is a substantially rectangular plate-shaped block, and the central part of the mounting part (24) has a storage part. A through hole (not shown) communicating with the internal space of (22) is formed, and the bottom surface of the mounting portion (24) is formed. Has a locking portion (24b) which is engaged with the mounting portion (14a) of the processing machine (14).

[0019]   The mounting part (14a) of the processing machine (14) has a plurality of (radially arranged on the mounting surface. In the embodiment, there are four locking protrusions (14b), and the outer surface of each locking protrusion (14b) has a horizontal direction. A chuck groove (14c) extending in the direction is formed. On the other hand, the locking part (24b) is It has a plurality of claws that are engaged with the chuck groove (14c) of the upright (14b), and each claw has a chuck groove (14c). ) Is attached to the electrode (12) by a chucking mechanism (14d) provided in the mounting portion (14a). The electrode (12) and collet holder (18) are added by chucking the shaft (12a). Centered and fixed to the machine tool (14) with high accuracy. In other words, the processing machine The center axis of the collet holder (18) is reproducible with respect to the center axis of the mounting part (14a) of (14). The chucks will be chucked in a highly accurate and consistent state.

[0020]   This collet holder (18) has a simple structure and can be processed with high accuracy. In combination with processing the collet (16) with AA grade accuracy, the electrode mounting jig (1 0) The overall processing accuracy can be dramatically improved. Therefore, in the storage hole (22a) When the collet (16) is stored, the center axis of the outer surface (16a) of the collet (16) and the insertion hole (16b) Of the center axis of the collet holder (18) and the center axis of the storage hole (22a) The amount of deviation can be 10 μm or less.

[0021]   Tighten the tightening nut (20) by pushing the collet (16) into the storage hole (22a) of the collet holder (18). As shown in FIG. 3, the nut (26) and the bearing ring And a collet locking portion (30).

[0022]   The nut part (26) has a tubular shape, and the inner peripheral surface of the lower end part of the nut part (26) has a collet A female screw (26b) that is screwed into the male screw (22c) of the holder (18) is formed. A plurality of locking grooves (26c) for locking the tool are formed. And the nut part ( On the inner peripheral surface of the upper end of (26), a plurality of steel balls (28a) and The collet locking part (30) is rotated by the bearing part (28) having the tenor (28b). It is provided here.

[0023]   The collet locking part (30) is annular, and the inner surface of the collet locking part (30) has a collet locking part (30). The locking inner collar (30b) to be locked in the locking groove (16c) formed in the let (16), and the collet (1 A tapered surface (30c) that is locked to the outer peripheral surface of the upper end portion of 6) is formed.

[0024]   When assembling the electrode mounting jig (10), collect the collet on the tightening nut (20). When the large diameter end of the collet (16) is inserted inside the part (30), the split grooves (16d) are evenly distributed. When contracted, the end on the large diameter side passes inside the locking inner collar (30b), and the collet locking part (30) is locked. The inner collar (30b) is fitted into the locking groove (16c) of the collet (16). And collet (16) The small-diameter end of the collet holder (18) is inserted into the storage hole (22a) of the collet holder (18). The female screw (26b) of the tightening nut (20) is screwed into the male screw (22c) of 18). At this stage Adjust the screwing amount of the tightening nut (20) so that the inner diameter of the collet (16) is not reduced. To be done. Therefore, the inner diameter of the collet (16) is larger than the outer diameter of the shaft (12a) of the electrode (12). It is getting bigger.

[0025]   When attaching the electrode (12) to the processing machine (14) using the electrode attachment jig (10), first, Engage the mounting part (24) of the electrode mounting jig (10) with the mounting part (14a) of the processing machine (14), and Then, the electrode mounting jig (10) is fixed to the processing machine (14). Then the shaft of the electrode (12) (12a) is inserted into the insertion hole (16b) of the collet (16), and the chucking mechanism ( Chuck 14d). Then, tighten the tightening nut (20). Then, The let (16) is pushed into the storage hole (22a) by the tightening nut (20), and The inner diameter (tapered surface) of the storage hole (22a) is pressed to reduce the diameter. Collet (16) When the diameter of the shaft is reduced, the outer surface of the shaft (12a) is fully supported by the inner surface of the collet (16). It will be tightened from the circumference and re-used. Here, the processing accuracy of the collet (16) is As it is of AA class, when the electrode (12) is attached to the processing machine (14), the collet (16) The center of the collet (16) is almost aligned with the center of the axis (12a) of the electrode (12). Of the axis (12a) at a position 4d away from the end face (16e) of the Becomes

[0026]   Also, the collet holder (18) that receives the collet (16) must have a simple structure. Can be processed with high accuracy, and when the collet (16) is stored in the storage hole (22a), the collet (16 ) Outer surface (16a) center axis, insertion hole (16b) center axis, collet holder (18) center axis , And the amount of accumulated deviation from the central axis of the storage hole (22a) can be set to 10 μm or less. It Therefore, the electrode (12) sandwiched between the center of the electrode mounting jig (10) and the collet (16) The center of the shaft (12a) of the Even if the number of electrodes (12) is changed and used, the processing accuracy in the processing machine (14) is impaired. You can prevent it from being exposed. This makes it possible to use electrodes exclusively for cutting machines and electric discharge machines. Attach the attachment jigs (10) in advance, and make multiple attachments for each electrode attachment jig (10). It is possible to replace and use the electrode (12) of, which significantly reduces the processing cost. be able to.

[0027]   In the present embodiment, the plurality of electrodes (12) attached to the electrode attachment jig (10) are appropriately The case of performing electrical discharge machining while exchanging is illustrated, but it is not limited to this. Yes. For example, multiple cuttings such as an end mill mounted on the electrode mounting jig (10). It is also possible to apply it when performing cutting while exchanging cutting tools as appropriate. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a method of using the embodiment of FIG.

FIG. 3 is a sectional view showing a usage state of the embodiment of FIG.

FIG. 4 is a sectional view showing an electric discharge machining method.

FIG. 5 is a front view showing a conventional electrode mounting jig.

[Explanation of symbols]

(10) ... Electrode mounting jig (12) ... Electrode (14) ... Processing machine (16) ... Colette (18)… Collet holder (20)… Tightening nut

Claims (4)

[Scope of utility model registration request] 1. An electrode has a tapered outer surface that gradually narrows from the insertion end of the shaft toward the other end, and an insertion hole extending from the insertion end to the other end, and is inserted into the insertion hole. A collet for tightening and fixing the shaft of the electrode from the surroundings, a storage portion having a storage hole formed in a tapered shape in accordance with the outer surface of the collet, and a storage portion at the insertion end side of the collet. An electrode mounting jig including a collet holder that is attached and has a tightening nut that fixes the collet to the storage portion, and a mounting portion that mounts the storage portion to a processing machine, wherein a central axis of the outer surface of the collet and the insertion hole. The central axis of
An electrode mounting jig, wherein the central axis of the collet holder and the central axis of the accommodation hole are formed with a cumulative deviation amount of 10 μm or less. 2. The electrode mounting jig according to claim 1, wherein the runout between the insertion hole of the collet and the tapered outer surface is 3 μm or less. 3. The center runout of the electrode shaft at a position separated from the electrode shaft insertion end of the collet by four times the diameter of the electrode shaft is 3 μm or less. The electrode mounting jig according to 2. 4. The electrode mounting jig according to claim 1, wherein the cumulative displacement amount is 5 μm or less.