JPH0669657B2 - Micro hole processing equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine hole drilling apparatus used for processing fine holes of 30 to 50 microns, such as an ink nozzle for an inkjet printer.

2. Description of the Related Art Conventionally, in order to process this kind of fine hole, there are a method of processing by direct electric discharge and a press processing method. The former is capable of processing only conductive materials, and the latter is suitable for processing copper-based soft metals and resin films. As an example of the latter,
A method has been proposed in which a punch is processed by wire electric discharge machining, a die is subsequently processed using this punch, and then a work is pressed using these punch and die (Spring Precision Engineering in 1987). Proceedings of the conference Yamamoto et al. "Micro punching using wire electric discharge grinding" P733).
Hereinafter, this conventional example will be described with reference to FIG.

In FIG. 3, reference numeral 51 denotes a punch, which is fixed to a capillary 53 made of an insulating material at the tip of the shaft 52. 54 is a support
55 is a leaf spring supported by 55, 56 is a rolling bearing interposed between the leaf spring 54 and the shaft 52, 57 is a magnetic circuit of a voice coil motor (VCM) fixed to the support portion 55, and 58 is a magnetic circuit 57. The magnet 59 is provided inside the bobbin, and the bobbin 59 is inserted inside the magnetic circuit 57 and is directly connected to the shaft 52. Reference numeral 60 denotes a geared motor supported on a magnetic circuit 57, the output shaft of which is linked by a bobbin 59, a slip ring 61, and a spring coupling 62. 63 is a wire for electric discharge machining the punch 51, 64 is a guide for guiding the wire 64,
It is moved to an electric discharge machining position and a non-machining position by a moving device (not shown). 65 is a die holder mounted on the bed 66, 67 is a die held by the die holder 65, 68 is a die 67
Work feeder that supplies work 69 to the top, 70 is work 69
It is a stripper that presses against the die 67.

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

Attach the punch material before electrical discharge machining to the punch 53 in the capillary 53, move the wire guide 64 and the wire 63 to the electrical discharge machining position, and drive the geared motor 60 to drive the bobbin 59 via the slip ring 61 and the spring coupling 62. , The shaft 52, the capillary 53 and the punch material are rotated, and the discharge power is supplied while dropping the insulating liquid onto the wire 63 and the punch material to discharge the punch material. After processing, the wire guide 64 and the wire 63 are moved to the non-processing position, the magnetic circuit 57 is energized, and the bobbin 59, the shaft 52, the capillary 53, and the punch 51 are lowered against the elasticity of the leaf spring 54, and the punch 51 and Discharge machining is performed on the die material by supplying discharge power while dropping the insulating liquid on the die material. After processing, the bobbin 5
9, The shaft 52, the capillary 53, and the punch 51 are raised by the elasticity of the leaf spring 54. Next, the punch 51 consumed by the electric discharge machining is electric discharge machined by the wire 63 in the same manner as above. Next, the work 69 is supplied by the work feeder 68 onto the electric discharge machined die 67, and the work 69 is die 67 by the stripper 70.
Hold against. Next, the magnetic circuit 57 is energized and the bobbin 59,
By lowering the shaft 52, the capillary 53, and the punch 51 against the elasticity of the leaf spring 54, the punch 51 and the die 67 are
Thus, a fine hole can be pressed in the work 69 on the die 67.

However, in the above-mentioned conventional example, since the shaft 52 that fixes the punch material is directly connected to the bobbin 59, it cannot be rotated at high speed, and therefore the punch material is processed into a cylindrical shape. In this case, it is difficult to obtain the roundness, and it is also difficult to sufficiently obtain the machining accuracy of the hole of the die 67. Further, since the shaft 52 to which the punch 51 is fixed is connected to the bobbin 59, it is extremely difficult to mount the punch 51 with the axes aligned when the punch 51 is once removed. Measurement cannot be confirmed, and punch cleaning is difficult. Further, since the die 67 is fixed immediately below the punch 51, it is difficult to measure the shape of the hole machined in the die 67. Therefore, in combination with the problem that the shape of the punch 51 cannot be measured as described above, it is impossible to accurately control the clearance between the punch 51 and the die 67, which is the most important factor during press working. Further, since the vertical movement of the punch 51 is restricted by the leaf spring 54, the punch stroke is as small as 1 mm.
Therefore, in practice, there is no room to install the work holder or the stripper 70. Further, since the discharge insulating liquid is dropped during punching and die processing, the insulating liquid is scattered to the periphery, and the processing waste cannot be removed sufficiently, and the processing waste adheres to improve the processing accuracy. The problem arises.

The present invention is to solve the problems of the conventional techniques as described above, it is possible to highly accurately process the punch and die necessary for the fine press, and to accurately measure each processed shape. An object of the present invention is to provide a fine hole drilling device capable of precisely controlling the clearance between the punch and the die at the time of press working, and thus achieving high precision of the fine hole press working. It is what

Means for Solving the Problems In order to achieve the above object, the present invention has a mandrel with a fine punch material attached thereto, a V-shaped bearing that rotatably supports the mandrel in a vertical direction, and a vertical V-shaped bearing. A linear guide that is movably supported only in one direction, a spring that supports a V-shaped bearing, a rotation driving means for the mandrel, and a means for running a wire for electric discharge machining of the fine punch material with a constant tension. A moving device for moving the wire to an electric discharge machining position and a non-machining position for the fine punch material and a die holder to a non-machining position and a machining position; and the V-shaped bearing, the mandrel and the fine punch material. Means for lowering for electric discharge machining, a discharge circuit for supplying electric discharge power between the fine punch material and the wire, or die material, The V-shaped bearing, the mandrel, and the means for lowering the electric discharge machined fine punch for punching a minute hole in the work with respect to the electric discharge machined die are provided.

Operation The present invention having the above-described configuration has the following operations.

That is, the wire is moved to the electric discharge machining position for the fine punch material by the moving device, the die holder is moved to the non-machining position, the mandrel and the fine punch material are rotated by the rotation driving means, and the V-shaped bearing is moved by the descending means. The electric discharge power of the electric discharge circuit is supplied to the fine punch material and the wire while lowering the mandrel and the fine punch material along the linear guide to perform electric discharge machining of the fine punch material. After the processing, the V-shaped bearing, the mandrel and the fine punch are lifted, the wire is moved to the non-processing position by the moving device, the die holder is moved to the processing position, and the mandrel and the fine punch are driven by the rotation driving means as described above. While rotating, the V-shaped bearing, the mandrel, and the fine punch are lowered along the linear guide by the lowering means, and the discharge power is supplied to the fine punch and the die material held in the die holder by the discharge circuit. Electrical discharge machining. After the machining, the V-shaped bearing, the mandrel and the fine punch are raised, and the fine punch consumed by the electric discharge machining is subjected to the electric discharge machining in the same manner as above. After the machining, the V-shaped bearing, the mandrel and the fine punch are linearized by the descending means. By moving down along the guide, a fine hole is pressed in the work on the die by this fine punch and die. Since the mandrel having the fine punch material attached thereto is rotated while being supported by the V-shaped bearing, high-precision electric discharge machining of the fine punch is possible, and the die punch is processed by the high-precision fine punch. Enables highly accurate electric discharge machining.
Further, even if the fine punch and the mandrel are removed from the V-shaped bearing, the V-shaped bearing can again support the high-precision position, and the die can be moved to the non-machined position by the moving device. The shape after processing can be measured, and precise clearance control during press processing can be realized. Further, since the mandrel with the fine punches attached thereto is supported by the V-shaped bearing and is lowered along with the V-shaped bearing along the linear guide, it is possible to prevent the mandrel from being distorted during press working, It can be reliably held in the vertical state.

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

1 and 2 show a fine hole drilling apparatus according to an embodiment of the present invention, FIG. 1 is a partially cutaway side view, and FIG. 2 is a sectional view of a state before drilling holes in a die blank. is there.

As shown in FIG. 1, a fine punch material 1 is inserted and fixed in a capillary 3 made of an insulating material at the tip of a mandrel 2. The mandrel 2 is formed in a cylindrical shape, and is formed so that the roundness of the outer circumference is good. On the other hand, a linear guide 5 is provided on the support base 4, and the V-shaped bearing 6 is supported by the linear guide 5 so as to be movable only in the vertical direction. A pulley 7 is attached to the mandrel 2, and a belt 10 is wound around the pulley 7 and a pulley 9 attached to a rotation shaft of a motor 8 supported by a support 4. The mandrel 2 is supported by the V-shaped bearing 6 by the tension of the belt 10 so as to be rotatable in the vertical direction with high accuracy, and the upper hemispherical portion of the mandrel 2 is brought into contact with the lower surface of the protruding portion 6a of the V-shaped bearing 6. The position is restricted. A compression spring 11 is interposed between the V-shaped bearing 6 itself and spring receivers 6b and 5a provided on the fixed portion of the linear guide 5, and the elastic weight of the compression spring 11 supports its own weight. The mandrel 2 can be supported on the V-shaped bearing 6 by the tension of the belt 10 for rotational drive, but when the press tact is short during press working as described later, sufficient accuracy can be obtained by vibration. In some cases, the mandrel 2 is fixed to the V-shaped bearing 6 by the plate 12. A central portion of a lever 14 is supported by a support member 13 attached to the support base 4 so as to be vertically swingable. A gear 16 is attached to a rotating shaft of a motor 15 supported by the support 4. On the other hand, a screw 17 is vertically screwed into the support base 4, and the screw 17
A gear 18 fixed to 17 is meshed with the gear 16 so as to be vertically movable, and a screw 17 is in contact with the base of the lever 14.
The tip of the lever 14 is in contact with the hemispherical portion above the protrusion 6a of the V-shaped bearing 6. Therefore, the gear 16 is rotated by the drive of the motor 15, and the gear 18 and the screw are accordingly rotated.
The V-shaped bearing 6, the mandrel 2 and the fine punch material 1 are made elastic by the compression spring 11 and the belt 10 by rotating 17 in the opposite direction to raise and raising the base of the lever 14 and lowering the tip. Can be lowered along the linear guide 5 against the tension. On the contrary, by driving the motor 15, the gear 16, the gear 18 and the screw
The V-shaped bearing 6, the mandrel 2, and the fine punch material 1 are linearly guided by the elasticity of the compression spring 11 and the tension of the belt 10 by rotating the gear 17 in the opposite direction to the above and lowering the gear 18 and the screw 17. It can be raised along 5. A solenoid 19 is supported on the support 4, and a shaft 20 of the solenoid 19 is connected to the base of the lever 14 on the side opposite to the screw 17. The shaft 20 is constantly urged toward the screw 17 by a spring (not shown). Therefore, by exciting the solenoid 19, the shaft 20 is retracted against the elasticity of the spring, the base of the lever 14 is raised, and the tip side is lowered, so that the V-shaped bearing 6, the mandrel 2 and the fine punch material 1 are provided. Can be rapidly lowered along the linear guide 5 against the elasticity of the compression spring 11 and the tension of the belt 10. On the contrary, by demagnetizing the solenoid 19, the elasticity of the compression spring 11 and the tension of the belt 10 can raise the V-shaped bearing 6, the mandrel 2, and the fine punch material 1 along the linear guide 5. The shaft 20 can be advanced by the elasticity of the spring. The support base 4 is supported so as to be movable in the vertical direction along the support columns 21, and a micrometer head 22 is provided between the support base 4 and the support columns 21 in the vertical direction. The above-mentioned members supported by the support base 4 are finely adjusted in the vertical direction.

A bed 24 is provided on the base 23, and a table is placed on the bed 24.
25 is movably supported and this table 25 is
Moved by. A processing tank 27 is attached to an upper part of one side of the table 25, an insulating plate 28 is attached to a bottom plate of the processing tank 27, and a wire guide 29 is supported by the insulating plate 28. The processing tank 27 is filled with the insulating liquid 30. A supply bobbin 31 and a take-up bobbin (not shown) are provided outside the processing tank 27, and a fine wire 32 made of a conductive material and wound around the supply bobbin 31 passes through the wire guides 33 and 29 to be taken up as a take-up bobbin. Being rolled up. The supply bobbin 31 is a DC supported on the table 25 or the like.
The winding bobbin is rotated by driving the motor 34, and the winding bobbin is rotated by driving a motor (not shown) supported by the table 25 or the like. Then, the motor is driven to rotate the winding bobbin and the DC motor 34 is driven to supply the bobbin.
By rotating 31 the wire changes in rotation torque.
32 can be run and wound on the winding bobbin,
By controlling the current applied to the DC motor 34 to be constant, the wire 32 can be run at a constant tension and a constant speed. Die holder 35 on the other side of table 25
Is attached to the inside of the upper part of the die holder 35.
As is apparent from the figure, the base of the die material 36 is screwed. The inner circumference of the base portion of the cylindrical body 37 is screwed to the upper outer side of the die holder 35, and an O-ring 38 is interposed between the upper end surface of the die holder 35 and the stepped end surface of the base portion of the cylindrical body 37 to form a watertight processing tank. And is filled with an insulating liquid 39 which dips the die material 36. In addition, as shown in FIG.
40 is supplied, and this work 40 is pushed by the stripper 41 to the die 36 '. Discharge power is selectively supplied between the fine punch material 1 and the wire 32, and between the processed fine punch 1'and the die material 36 by a discharge circuit 42 having a resistor and a capacitor. At the non-machined position of the die holder 35, a microscope 43 for observing and measuring the shape of the hole of the die 36 after machining.
Is provided.

Next, the operation of the above embodiment will be described.

First, the table 25 is moved by the driving device 26 to move the wire 32 to the electric discharge machining position for the fine punch material 1 and the die holder 35 to the non-machining position as shown in FIG. Next, the mandrel 2, the fine punch material 1 and the like are rotated along the V-shaped bearing 6 via the pulley 9, the belt 10 and the pulley 7 by driving the motor 8, and the lever is driven by driving the motor 15 as described above.
The tip side of 14 is lowered to lower the V-shaped bearing 6, the mandrel 2, the fine punch material 1, etc. along the linear guide 5, and the fine punch material 1 and the wire are discharged by the discharge circuit 42.
By supplying electric discharge power to 32, the fine punch material 1 is electric discharge machined in the machining tank 27. Since the electric discharge machining is performed in the insulating liquid 30 of the processing tank 27 in this way, there is no risk of splashing as in the case of dropping the insulating liquid, and since machining scraps do not easily adhere, the machining accuracy can be improved. . After processing, as described above, the impact resilience of the compression spring 11 and the belt 10
The tension causes the V-shaped bearing 6, the mandrel 2, and the fine punch 1'after processing to be raised. Next drive
The table 25 is moved in the opposite direction by 26 to move the wires 32 and the like to the non-processing position, and the die holder 35
Is moved to a processing position directly below the fine punch 1 '. Second
As shown in the figure, the die material is
The base of 36 is screwed, the inner circumference of the base of the cylinder 37 is screwed on the upper outside of the die holder 35, and the O-ring 38 is interposed between the upper end surface of the die holder 35 and the step end surface of the base of the cylinder 37. Then, the inside of the cylindrical body 37 is filled with the insulating liquid 39 and the die material 36 is dipped in the insulating liquid 39 (these operations may be performed in the non-processed position). Next, similarly to the above, the motor 8 is driven to rotate the mandrel 2 and the fine punches 1 ′ along the V-shaped bearing 6, and the motor 15 is driven to move the lever 14
While lowering the tip side of the V-shaped bearing 6, the mandrel 2, the fine punch 1 ', etc. along the linear guide 5, the discharge circuit 42 causes the fine punch 1'and the die holder 35 to move.
A hole is formed in the die material 36 by electric discharge by supplying electric discharge power to the die material 36 held in. In this way the cylinder 37
Since the electric discharge machining is performed in the insulating liquid 39 inside, there is no risk of splashing as in the case where the insulating liquid is dropped, and since machining waste does not easily adhere, the machining accuracy can be improved. After processing, due to the impact resilience of the compression spring 11 and the tension of the belt 10 as described above, the V-shaped bearing 6 and the mandrel 2 are formed.
And the fine punch 1'and the like are raised. This fine punch 1'cannot be used as it is for the pressing work because the tip portion of the fine punch 1'is consumed by the electric discharge machining with the die material 36. Therefore, the shape is processed again by electric discharge machining with the wire 32 in the same manner as above. On the other hand, after processing the die 36 ', the insulating liquid 39 is drained, filled with a solvent, and the hole of the die 36' is washed. Then, the tubular body 37 is removed. The shape of the fine punch 1'after processing can be measured by removing the mandrel 2 from the V-shaped bearing 6, and the measurement term is again the V-shaped bearing 6.
Can be supported in its original position along. Also, the shape of the hole of the die 36'after processing can be observed by the microscope 43 while moving to the non-processing position, and the table 25
It is also possible to measure the hole diameter dimension from the value of the position. The fine punch 1'and die 36 'processed as described above are placed on the table 25.
The work 40 is fixed again by the stripper 41 on the die 36 '. After fixing, the solenoid 19 is excited as described above, the tip side of the lever 14 is lowered, and the V-shaped bearing 6, the mandrel 2, the fine punch 1 ', and the like are rapidly lowered along the linear guide, so that the work 40
To press the fine holes. After processing, the solenoid 19 is demagnetized to repel the compression spring 11 and the belt 10.
The tension of the V-shaped bearing 6, the mandrel 2, the fine punch 1 ', and the like are raised to move the fine punch 1'to the die 3
6 ′, pull out from the work 40. In such press working, the mandrel 2 is supported on the V-shaped bearing 6 by the tension of the belt 10 for rotational driving, but when the press tact is short, sufficient accuracy may not be obtained due to vibration. Yes, with plate 12 mandrel 2 as described above
May be fixed to the V-shaped bearing 6.

EFFECTS OF THE INVENTION As described above, according to the present invention, the mandrel having the fine punch material attached thereto is rotated while being supported by the V-shaped bearing, which enables high-precision electric discharge machining of the fine punch. High-precision machining of the fine punch enables highly accurate electrical discharge machining of the die. Further, even if the fine punch and the mandrel are removed from the V-shaped bearing, the V-shaped bearing can again support the high-precision position, and the die can be moved to the non-machined position by the moving device. It is possible to measure the shape after processing
It is possible to realize precise clearance management during press working. Further, since the mandrel with the fine punches attached thereto is supported by the V-shaped bearing and is lowered along with the V-shaped bearing along the linear guide, it is possible to prevent the mandrel from being distorted during press working, It can be reliably held in the vertical state. Therefore, the precision of the fine hole press working can be improved.

[Brief description of drawings]

1 and 2 show a fine hole drilling apparatus according to an embodiment of the present invention, FIG. 1 is a partially cutaway side view, and FIG. 2 is a sectional view of a die material before drilling holes, FIG. 3 is a partially cutaway side view of a conventional fine hole drilling apparatus. 1 ... Fine punch material, 1 '... Fine punch, 2 ... Mandrel, 3 ... Capillary, 5 ... Linear guide, 6
...... V-shaped bearing, 8 …… motor, 11 …… compression spring, 14…
… Lever, 15 …… Motor, 19 …… Solenoid, 25 …… Table, 26 …… Drive, 27 …… Machining tank, 32 …… Wire, 35 …… Diamond holder, 36 …… Die material, 36 ′… … Die, 40… Work, 41… Stripper, 42… Discharge circuit, 43… Microscope.

Claims (6)

[Claims] 1. A mandrel to which a fine punch material is attached, and a V for rotatably supporting the mandrel in a vertical direction.
A V-shaped bearing, a linear guide that movably supports the V-shaped bearing only in the vertical direction, a spring that supports the V-shaped bearing, a rotation driving means of the mandrel, and the electric discharge machining of the fine punch material. Means for running the wire with a constant tension, a moving device for moving the wire between an electric discharge machining position and a non-machining position for the fine punch material, and a die holder for moving to the non-machining position and the machining position, A V-shaped bearing, a mandrel, and means for lowering the fine punch material for electric discharge machining; a discharge circuit for supplying discharge power between the fine punch material and the wire or the die material on the die holder; Equipped with a character-shaped bearing, a mandrel, and means for lowering an electric discharge machined fine punch to punch a minute hole in a workpiece with respect to an electric discharge machined die. That fine drilling device. 2. A mandrel rotary drive means comprises a motor, a mandrel and a pulley mounted on the rotary shaft of the motor, and a belt hung on these pulleys. The tension of the belt supports the mandrel to a V-shaped bearing. The fine hole drilling apparatus according to claim 1. 3. The fine hole drilling apparatus according to claim 1, further comprising means for closely fixing the mandrel to the V-shaped bearing. 4. A microscope for measuring the hole shape of an electric discharge machined die at a non-machining position by movement of a moving device.
The fine hole drilling device according to any one of 1 to 3. 5. The fine hole drilling apparatus according to claim 1, further comprising a working tank filled with an insulating liquid for immersing the wire. 6. A die holder on the outer periphery of a die material,
The fine hole drilling apparatus according to any one of claims 1 to 5, further comprising a cylindrical body that is detachably attached to a watertight structure and that is filled with an insulating liquid that immerses the die material.