JPH02250800A - Die set for micro hole press processing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to micro-hole press processing used to press micro-holes of 30 to 50 microns such as ink nozzles for inkjet printers and orifices for gas flow rate control. This relates to die sets for

BACKGROUND OF THE INVENTION Conventionally, there are two methods for machining this type of microhole: a direct discharge machining method and a press machining method.

The former can process only conductive materials, and the latter is suitable for processing copper-based soft metals, resin films, etc. As an example of the latter, a method has been proposed in which a punch is machined by wire electrical discharge machining, a die is machined using this punch, and then the material to be pressed is pressed using these punches and dies. (Yamamoto et al., 1985 Spring Collection of Precision Engineering Papers). This conventional example will be explained below with reference to FIG.

In FIG. 6, a punch 51 is fixed to a capillary 53 made of an insulating material at the tip of a shaft 52. In FIG. 54 is a leaf spring supported by the support portion 55; 56 is a rolling bearing interposed between the leaf spring 54 and the shaft 52; and 57 is a magnetic circuit of a voice coil motor (VCM) fixed to the support portion 55.

58 is a magnet provided inside the magnetic circuit 57, 59 is a bobbin inserted inside the magnetic circuit 57, and is directly connected to the shaft 52. A geared motor 60 is supported on the magnetic circuit 57, and its output shaft is linked to the bobbin 59 through a slip ring 61 and a spring coupling 62.

63 is a wire for electrical discharge machining the punch 51, and 64 is a guide for guiding the wire 64, which is moved by a moving device (not shown) between an electrical discharge machining position and a non-discharge machining position. 65 is a die holder attached to the pet 66, 67 is a die held by the die holder 65, 68 is a feeder that supplies a material to be pressed 69 onto the die 67, and 70 is a material to be pressed 6
9 is a stripper that presses the die 67 against the die 67.

Next, the operation of the above conventional example will be explained.

A punch material before electrical discharge machining is attached as a punch 51 to the capillary 53, and a wire guide 64 and wire 6 are attached.
3 to the electrical discharge machining position, and the geared motor 60 is driven to rotate the bobbin 59, shaft 52, capillary 53, and punch material via the slip ring 61 and spring coupling 62, and insulating liquid is applied to the wire 63 and the punch material. The punch material is subjected to electrical discharge machining by supplying electrical discharge power while dropping the punch material, thereby forming the punch 51. After forming, the wire guide 64 and the wire 63 are moved to a non-processing position, the magnetic circuit 57 is energized, and the bobbin 59 and shaft 52 are
, the capillary 53 and the punch 51 are lowered against the elasticity of the leaf spring 54, and the die material is subjected to electrical discharge machining by supplying electrical discharge power while dropping an insulating liquid onto the die material held on the punch 51 and the die holder 65. , forming a die 67. After the formation, the bobbin 59, shaft 52 . Capillary 53, punch 5
1 is raised by the elasticity of the leaf spring 54. Next, the punch 51 that has been consumed by the electric discharge machining is subjected to electric discharge machining using the wire 63 in the same manner as described above. Next, a material to be pressed 69 is fed onto the die 67 subjected to electrical discharge machining by a feeder 68, and the material to be pressed 69 is pressed against the die 67 by a stripper 70. Next, the magnetic circuit 57 is energized, and the bobbin 59, shaft 52, capillary 53, and punch 51 are connected to the leaf spring 54.
By lowering the punch 51 against the elasticity of the
By using the die 67, a fine hole can be formed in the material 69 to be pressed on the die 67.

Problems to be Solved by the Invention However, in the above conventional example, the shaft 52 that fixes the punch material is directly connected to the bobbin 59, so it is not possible to rotate it at high speed, and therefore the punch material cannot be processed into a cylindrical shape. In this case, it is difficult to obtain roundness, and it is also difficult to obtain sufficient machining accuracy for the hole of the die 67. In addition, the shaft 52 to which the punch 51 is fixed is connected to the bobbin 59, and once the punch 51 is removed, it is extremely difficult to attach it with the axes aligned, so the shape of the punch 51 that has been subjected to electrical discharge machining is The measurement cannot be confirmed and cleaning of the punch is difficult. Furthermore, since the die 67 is fixed directly below the punch 51, it is difficult to measure the shape of the hole formed in the die 67. Therefore, in addition to the problem of not being able to measure the shape of the punch 51 as described above, the punch 51 and die 6, which are the most important during press working,
It is not possible to accurately manage the clearance with 7. Further, since the vertical movement of the punch 51 is restricted by the leaf spring 54,
Punch stroke is small at 1m. Therefore, in reality, there is no room to provide a presser for the material to be pressed, a stripper 70, etc. Furthermore, since the discharge insulating liquid drips during punching and die machining, the insulating liquid scatters to the surrounding area, and machining debris cannot be removed sufficiently, resulting in poor machining accuracy. The above problem arises.

The present invention solves the problems of the prior art as described above, and can realize the processing of punches and dies necessary for micro-pressing with high precision. It is an object of the present invention to provide a die set for micro-hole press processing, which allows precise management of die clearance and, therefore, improves the accuracy of micro-hole press processing.

Means for Solving the Problems In order to achieve the above object, the present invention includes a support means for rotatably supporting a microscopic punch, and electrical discharge machining of a die hole using the microscopic punch as an electrode. It is integrally equipped with an attachment part for fixedly attaching a die material that presses a material to be pressed in cooperation with a fine punch.

It is preferable that the supporting means for the fine punch has a V-shaped bearing that rotatably supports the mandrel to which the fine punch is attached, and that a non-conductive ceramic material is used for the attachment part of the die material. is preferable, and the die material is in the shape of a rectangular parallelepiped plate, the parallelism of the surface on the electrical discharge machining side of the die hole and its back surface, and the straightness of the side surface are set with high precision, and the side surface is used as a reference for mounting. Preferably, it is fixedly attached to the part.

Effects The present invention has the following effects due to the above configuration.

In other words, since the support means for rotatably supporting the fine punch and the attachment part for the die material are integrally constructed,
By incorporating this into an electrical discharge machining device, it is possible to perform electrical discharge machining on a die material using a fine punch, and after electrical discharge machining, by incorporating it into a press processing device, the material to be pressed on the die can be At this time, as mentioned above, the support means for the micro punch and the mounting part for the die are integrally constructed, so the precision and tolerance during press processing between the micro punch and the die can be reduced. Management can be realized.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

Figure 1 (al and (bl) indicate a die set for micro-hole press processing in one embodiment of the present invention, Figure 1 (at) is a partially cutaway side view, Figure 1 (bl is Figure 1 (at) Ib-
It is a sectional view taken along the Ib arrow.

As shown in Fig. 1 (al, (bl), a fine punch 1 is inserted and fixed into a capillary 3 at the tip of a mandrel 2. The outer diameter of the mandrel 2 is polished to a good roundness by cylindrical grinding, etc. On the other hand, a die set 8 is constructed by integrally providing a mounting base 6 for the V-shaped bearing 4 and a die material 5 with a continuous portion 7. A hole 9 is formed in the part. Attachment 6
is made of non-conductive ceramic, and the mounting base 6 is provided with a reference side surface 10, a punching hole 1) is formed in front of the reference side surface 10, and a stripper 12 is provided on the upper surface. In this embodiment, the continuous portion 7 of the die set 8
A motor 13 for rotationally driving the fine punch 1 is supported on the holder. A pulley 14 is attached to the middle part of the mandrel 2, and the output shaft 15 of the motor 13 is connected to the pulley 14.
A round belt 17 is hung on a pulley 16 mounted above through a hole 9. A constant preload force is applied to the mantle 2 by the tension of the round belt 17, and the V-shaped bearing 4
The zero die material 5 is rotatably supported with high precision in the vertical direction.
is formed in the shape of a rectangular parallelepiped plate, and the front and back surfaces on the electrical discharge machining side of the die hole 33 are formed to be highly accurate parallel surfaces, and the reference side surface 18 is a highly accurate parallel surface to these front and back surfaces. This reference side surface 18 is aligned with the reference side surface 10 of the mounting base 60 and attached in a fixed state.N Next, regarding the operation of machining a die hole using the die set 8 of the embodiment of the present invention configured as described above. explain.

The second reason is as shown in FIGS.
1 is a sectional view for explaining the die hole machining operation.

As shown in FIG. 2, a column 21 erected on a base 20 in a processing tank 19 has a pair of upper and lower support portions 22 and 23 projecting horizontally. A movable part 25 is supported on the front side of the lower support part 23 via a linear guide 24 so as to be movable only in the vertical direction. A motor 26 is supported on the upper support part 22, and a feed screw 28 connected to an output shaft 27 of the motor 26 is screwed into a screw hole 25a of the movable part 25. Therefore, by driving the motor 26 and rotating the output shaft 27 and the feed screw 28 in either direction, the movable part 25 is lowered.

Or it can be raised. The continuous part 7 of the die set 8 is removably attached on the pace 20,
The die material 5 attached to the mounting base 6 as described above is immersed in the electrical discharge machining oil 29 filled in the machining tank 19.

A steel ball 30 interposed between the upper end of the mandrel 2 and the feed screw 28 is supported, and one side of a discharge circuit 31 consisting of a power source V, a capacitor C1, and a resistor R is connected to the die material 5, and the other side is connected to a brush. 32 to the steel ball 30, thereby forming a discharge circuit 31 between the die material 5 and the fine punch 1.

Then, discharge power is supplied to the fine punch 1 and the die material 5 by the discharge circuit 31, and the pulley 1 is driven by the motor 13.
6. Mandrel 2 via round belt 17 and pulley 14
．． While rotating the capillary 3 and the fine punch 1, the movable part 2 is rotated by the feed screw 28 by the drive of the motor 26.
5, the mandrel 2, capillary 3, and fine punch 1 are lowered along the V-shaped bearing 4, and the fine punch 1 is brought close to the die material 5. As shown in FIG. 5, the machining of the die hole 33 that forms a constant discharge gap with the fine punch 1 progresses, and finally as shown in Fig. 3 (
The die hole 33 is electrically discharged as shown in bl. This electric discharge machining requires minute energy discharge and ultra-fine feed control of the fine punch 1. Micro energy discharge is possible by making the stray capacitance between the discharge circuit 31 and the micro punch 1 and the die material 5 extremely small, and this stray capacitance can be reduced by forming the mounting base 6 from ceramic as described above. On the other hand, ultra-fine feed control of the fine punch 1 is possible by micro-drive of the motor 26, feed screw 28, etc. As this electrical discharge machining progresses, the fine punch 1 becomes tapered, so the die hole 33
The shape is tapered so that the upper diameter is slightly larger than the lower diameter. Die 5' processed in this way
is removed from the mounting base 6, and the diameter of both the front side and the back side of the die hole 33 is measured. Here, based on the diameter of the small diameter back side of the die hole 33, the material of the material to be pressed, the plate thickness, etc., the diameter of the fine punch 1 that optimizes the clearance in press processing is determined for the diameter of the die hole 33. Then, the fine punch 1 is removed from the V-shaped bearing 4 along with the mandrel 2, etc., and measured. Thereafter, it is rotated along the V-shaped bearing 4 with the outer diameter of the mandrel 2 as a reference in the same manner as above, and then, for example, wire electric discharge grinding is performed. processed according to the law.

Next, the operation of pressing a material to be pressed using the die 5° processed as described above and the fine punch 1 will be described.

FIG. 4 is a partially cutaway side view of a press processing apparatus constructed using the die set of the embodiment of the present invention, and FIG. 5 (at, (bl)
4A and 4B are cross-sectional views for explaining the press working operation in the direction of arrow V in FIG. 4, respectively.

Column 3 erected on pace 34 as shown in Fig. 4
A solenoid 37 is attached to the tip of the horizontal protrusion 36 of 5. On the pace 34 is a continuous portion 7 of the die set 8.
is removably attached, and a steel ball 39 interposed between the upper end of the mandrel 2 and the solenoid shaft 38 of the solenoid 37 is supported.

A tension spring 40 is provided between the pulley 14 and the V-shaped bearing 4.
, and the elasticity of the tension spring 40 causes the mandrel 2. Pressure is applied upward to increase the pulling force of the capillary 3, fine punch 1, etc. after press working.

Then, the die 5' which has been subjected to electrical discharge machining as described above is mounted with its back side facing upward and its reference side surface 18 aligned with the reference side surface 10 of the mounting base 60 (see FIG. 1). Note that if the taper of the die hole 33 can be ignored, there is no need to turn it over. In any case, since the die 5' is mounted with the reference side surface 18 aligned with the reference side surface 10 of the mounting base 6 as described above, the axis of the die hole 33 and the fine punch 1 can be aligned. As shown in FIG. 5 (al), the material to be pressed 41 is set on the die 5' using the strips 12. After setting in this way, the solenoid 37 is driven to lower the solenoid shaft 38, and the manbillion is lowered. 2. By rapidly lowering the capillary 3 and the fine tip 1, etc., it is possible to press the pressed material 41 as shown in FIG. 5 (bl).

In the above embodiment, the solenoid 37 is used as the press drive source.
Although the case in which the press drive source is used has been described, the press drive source may be optimally selected depending on the type of press operation. Further, the fine punch 1 may be processed by a wire electric discharge grinding method or the like using the die set 8 of the present invention without being processed in advance, and high precision molding is possible by using the wire electric discharge grinding method. It is also possible to perform electrical discharge machining for the hole machining of the stripper 12 in the same manner as the tie hole machining.0Also, by fixing the mandrel 2 to the V-shaped bearing 4, a non-circular die hole can be formed in the die material 5. It is also possible to do so.

As described above, according to the above embodiment, the mandrel 2 to which the fine punch 1 is attached can be rotated at high speed by driving the motor 13 while being supported by the V-shaped bearing 4. Since electrical discharge machining can be performed in the machining tank 19, the die hole 33 can be punched with the fine punch 1.
High-precision electrical discharge machining becomes possible. Also, fine punch 1
And even if the mandrel 2 is removed from the V-shaped bearing 4, the V
It can be supported in a highly accurate position by the shaped bearing 4, and since the V-shaped bearing 4 and the mounting base 6 are integrally formed by the continuous part 7, precise tolerance management during press processing is possible. It can be realized.

Effects of the Invention As described above, according to the present invention, the support means for rotatably supporting the fine punch and the attachment part for the die material are integrally constructed, so that by incorporating this into an electric discharge machining apparatus, , the die material can be subjected to electrical discharge machining using a fine punch, and therefore the die machining required for fine pressing can be achieved with high precision. In addition, after electrical discharge machining,
By incorporating it into a press processing device, the fine punch and die can press a fine hole in the material to be pressed on the die, and at this time, as described above, the supporting means of the fine punch and the attachment part of the die are Since it is integrally constructed, the clearance between the fine punch and the die during press processing can be precisely controlled, and therefore, the precision of the fine hole press processing can be improved.

[Brief explanation of drawings]

Figure 1 (at, (bl) shows a die set for micro-hole press processing in one embodiment of the present invention, the same figure (at is a partially broken side view, the same figure (bl is the same figure (Ib-Ib of at) Fig. 2 is a partially cutaway side view of a die hole machining device constructed using a die set according to an embodiment of the present invention. Fig. 4 is a partially cutaway side view of a press working device constructed using the die set of the embodiment of the present invention, and Fig. 5(a)
, (bl is a sectional view for explaining the press working operation in the direction of arrow V in FIG. 4, respectively, and FIG. 6 is a partially broken side view showing a conventional fine hole press working device. 1... Fine punch, 2...Mandrel, 4...V
Shape bearing, 5 - Die material, 5'...Die, 6... Mounting stand. 7... Continuous part, 8... Die set, 10... Reference side surface, 12... Stripper 13... Motor, 1
8... Reference side surface, 19... Processing tank, 26... Motor, 31... Discharge circuit, 33... Die hole, 37...
Solenoid, 41... material to be pressed. Name of agent: Patent attorney Shigetaka Awano and one other person Figure (b) Figure 1 a Figure\15Ju (fl'J)

Claims (4)

[Claims] (1) A support means for rotatably supporting a fine punch, and electrical discharge machining of a die hole is performed using the fine punch as an electrode,
A die set for micro-hole press processing, which is integrally equipped with a mounting part for fixedly attaching a die material that cooperates with the above-mentioned micro-punch to perform press processing on a material to be pressed after electrical discharge machining. (2) The die set for micro-hole press processing according to claim 1, wherein the support means for the micro-punches includes a V-shaped bearing that rotatably supports the mandrel to which the micro-punches are attached. (3) The die set for micro-hole press processing according to claim 1 or 2, wherein a non-conductive ceramic material is used for the mounting portion of the die material. (4) The die material is in the shape of a rectangular parallelepiped plate, the parallelism of the surface on the electrical discharge machining side of the die hole and its back surface, and the straightness of the side surface are set with high precision, and the state is fixed to the mounting part with the above side surface as a reference. The die set for micro-hole press processing according to any one of claims 1 to 3, which is attached to a die set.