JPH08174491A - Punching mechanism - Google Patents

Abstract

PURPOSE: To provide a punching mechanism capable of continuously performing a high-precise and fine-diameter punching by improving straight traveling properties of a punch. CONSTITUTION: Guiding of a plunger 94 in hitting of a punch 9 is performed by the point contact to fine-diameter balls 105 dotted around two upper and lower parts of a retainer 104, and to be elastically deformed by the plunger 94, and guiding of the retainer 104 in hitting of the punch 9 is performed by the point contact with the balls 105 in relation to the inner peripheral surface of a large-diameter hole part 63a of a punching tool holder 3 and the inner peripheral surface of a small-diameter hole part 63b The retainer 104 repeats the linear motion wherein it is slid with the small hitting resistance by the point contact without being inclined in relation to the punching tool holder 3, and the plunger 94 performs the liner motion in relation to the retainer 104.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching mechanism capable of punching a work such as a thin plate.

[0002]

2. Description of the Related Art Conventionally, a punching mechanism is provided with a detachable punch on a plunger, and the punching mechanism can be inserted into and removed from a piercer holder fixed to the machine base or a piercer holder movable on the machine base. It is inserted and can be replaced with a favorite punch when necessary. The straightness of the plunger is achieved by a receiving structure called a metal guide system.By the metal guide system, the plunger supported so that it can move up and down is struck to punch holes in the workpiece. are doing.

[0003]

The metal guide system is
This is a receiving structure where the plunger is in surface contact with the support hole opened in the piercing tool holder.
Since a large striking force is required and a smooth striking cannot be guaranteed, a desired clearance is secured between the plunger and the plunger. However, the plunger tilts at the time of hitting due to the influence of the clearance, which causes a deviation in the drilling position. Also, there are many cases where the punch is broken due to the tilting driving force. Furthermore, when a soft and viscous work such as a ceramic green sheet is to be punched, the next punch is performed while the chip remains punched by the punch, and the punch of the work is obstructed. , Adheres to the back surface of the sheet and causes the sheet to be clogged. The means for collecting punching chips attached to such punches or attached to the back surface of the sheet is a combination of jetting of air from the air passage formed in the die and vacuum from the bottom of the die to create a punching hole in the die. High-pressure air is jetted from the side to the punch that enters, and the punching chips that adhere to the punch are peeled off by the downward suction in parallel with this. However, when a soft and viscous work is to be punched as described above, the adhesive force of the punching tip to the punch is very large, and the adhering tip may not peel off. There was also.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional circumstances, and an object thereof is to provide a punching mechanism capable of continuously punching with high precision and fine diameter by improving the straightness of a punch. . Still another object of the present invention is to provide a punching mechanism in which chips adhered to a punch or adhered to the back surface of a sheet (work) can be reliably removed.

[0005]

The technical means taken to achieve the above object is as follows. A first aspect of the present invention is a plunger having an external shape having a punch and having a large-diameter portion and a small-diameter portion connected vertically. A piercing tool, a piercing tool holder having a large-diameter hole portion and a small-diameter hole portion communicating vertically with each other, and supporting the plunger in a removable manner, and a retainer interposed between the plunger and the piercing tool holder. The retainer has a cylindrical shape having a large-diameter portion and a small-diameter portion corresponding to the large-diameter portion and the small-diameter portion of the plunger and the large-diameter hole portion and the small-diameter hole portion of the piercing tool holder. And a small-diameter cylindrical portion protruding in and out to support a fine-diameter ball in a scattered and rotatable manner, and the ball slides on the inner peripheral surface of the large-diameter hole portion and the inner peripheral surface of the small-diameter hole portion of the piercing tool holder. Slidably fit the retainer so that it is possible The plunger, the large-diameter cylindrical portion of the retainer in the state of being slightly elastically deformed the ball,
The gist is that it is slidably fitted in the small-diameter cylindrical portion. The gist of the present invention is that the diameter, the long side and the short side of the punch according to the first aspect are set to 100 microns or less. According to a third aspect of the present invention, the driving source according to the first or second aspect is air, and the small air source is communicated with the driving source in the plunger and blows air from the lower end portion of the plunger adjacent to the punch in synchronization with the driving of the plunger. An air passage is formed, a stripper formed of a soft elastic material surrounding the punch including the outlet of the small air passage is provided at the lower end of the plunger, and a punch hole closed by the work at the time of hitting is opened in the stripper. The gist is that you have done.

[0006]

According to the above technical means, there are the following actions. (1) The plunger is guided at the time of punching by a point contact with a fine-diameter ball which is scattered around the upper and lower portions of the retainer and slightly elastically deformed by the plunger. Guiding of the retainer at the time of hitting is performed by point contact between the inner peripheral surface of the large-diameter hole portion and the inner peripheral surface of the small-diameter hole portion of the piercer holder. Therefore, the retainer slides with respect to the piercing tool holder, and the plunger slides with a small striking resistance due to point contact with the retainer, and repeats a rectilinear motion without inclination. (Claim 2) There is no clearance unlike the conventional example, and the punch does not break due to inclination even if the punch is less than 100 microns because of its high straightness. (Claim 3) Along with the plunger being driven,
Air is supplied while elastically expanding and deforming the stripper into the stripper that abuts the workpiece in a state where the punch holes are blocked by the workpiece during striking. The air inside the stripper instantly blows out from the punch holes that are opened when the punch moves back. With this air, the punch and the punched chips attached to the back surface of the work are peeled off.

[0007]

As described above, the present invention has the following advantages. (Claim 1) The plunger is smoothly guided in the vertical direction with a small resistance due to point contact of the ball with the retainer, and the retainer is smoothly guided in the vertical direction with a small point contact of the ball with the piercer holder. Therefore, even if the punch has a fine diameter, it exhibits a high straightness guide. Therefore, the durability is improved, and a highly accurate hole with a fine diameter can be formed. (Claim 2) As a result of providing the structure of claim 1, the punch has
Even if it is less than 0 micron, in particular, even the existing one of about 30 micron, it does not break due to its high straightness, and it can perforate ultra-fine holes without deteriorating the durability of ultra-fine-diameter snaps. (Claim 3) Air is supplied into a stripper in which a punch hole is closed by a work every time a punch strikes, and the stripper is elastically expanded and deformed. Since the compressed air is blown out at once, the compressed air blows out from directly above the adhering chip toward the adhering chip at a stroke, and the peeling is reliable.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 4 show the punching mechanism of this embodiment. Symbol A indicates the punching mechanism.

The punching mechanism A is provided with a large number of piercing tool holders 3 on a vertical row of the supporting rod 2 attached to one end of the machine base 1, and the piercing tools 4 are provided in the piercing tool holder 3 so as to be able to be inserted and removed. It is configured.

As shown in FIG. 3, the piercing tool holder 3 is provided at the tip of an upper half 13a of a support rod 13 having a U-shaped front view and having a transfer space 23 for a workpiece 100 in an intermediate portion. A work table 5 is provided at the tip of the lower half 13b of the support rod 13 so as to fix the lower half 13b of the machine 13 to one side of the machine base 1 and to face the punch holder 3.

The machine base 1 comprises an X moving mechanism 6a and a Y moving mechanism 6b, and has on its upper surface a moving section 6 for gripping and moving the work 100 in the X and Y directions.

As shown in FIG. 3, the X moving mechanism 6a has a servo motor 36 attached to one end of a table 26 fitted over two guide portions 16 parallel to the Y direction. 36 units
A moving body 66 connected to a screw 46 rotatably supported at the upper end on the other side and having a work holder 56 on the screw 46
Is screwed in, and the screw is driven by the servo motor 36.
The moving body 66 is configured to move in the X direction by the rotation of 46, and the Y moving mechanism 6b is configured by screwing the screw 86, which is connected to the servo motor 76 provided on the machine base 1, into the base 26. do it,
The base 26 itself moves on the guide portion 16 in the Y direction by the rotation of the screw 86 driven by the servo motor 76.

As shown in FIGS. 1 to 3, the piercing tool holder 3 is fixed to a lower surface of a bracket 23 provided at the tip of the upper half portion 13a of the support rod 13, and is opened in the bracket 23 to form an inner upper surface. A large number of communication holes 43 communicating with the connection holes 33 in which the mounting screws 33a are screwed are opened in rows and columns with the communication holes 43 approaching each other,
A sleeve 53 is fitted and fixed in the communication hole 43 and the sleeve 53
A fitting hole 63 for a piercing tool is formed in 53. In addition, fitting hole
The holes 63 are opened in a checkerboard shape while approaching each other, but are not limited to this, and may be formed irregularly at intervals rather than in a row and column.

The fitting insertion hole 63 is vertically communicated with the large diameter hole portion 63a.
And a small-diameter hole 63b, and a step 63c for mounting the first return spring 7 is formed between the large-diameter hole 63a and the small-diameter hole 63b.

Each of the piercing tools 4 is connected to a driving source (compressor in the present embodiment) 8 so as to be selectively driven, and is connected to a cylinder.
External screw 44a for screwing the lower opening of 14 into the mounting screw 33a
The cylinder rod 54 is slidably inserted into the cylinder 14 by projecting the cylinder rod 54 from the closing metal fitting 44, and the second portion is provided between the head 54a of the cylinder rod 54 and the closing metal fitting 44. A hammer 74 is connected to the tip of the cylinder rod 54 via a coupling 64 via a return spring 8, and a plunger mechanism 84 equipped with a punch 9 is attached to the hammer 74.

The plunger mechanism 84 has a connection screw 94a screwed into the outer peripheral surface of the hammer 74 at the upper end opening and a hollow plunger 94 having a support hole 94b for the punch 9 at the lower end.
, A retainer 104 for guiding the plunger 94 in the vertical direction, and a punch 9 supported by the plunger 94.

The retainer 104 has a cylindrical shape in which a large diameter cylindrical portion 104a corresponding to the large diameter hole portion 63a of the fitting insertion hole 63 and a small diameter cylindrical portion 104b corresponding to the small diameter hole portion 63b are connected in series, and the large diameter Diameter cylinder
The fine-diameter balls 105 project inward and outward from the small-diameter cylindrical portion 104b and are scattered and rotatably supported. The large-diameter cylindrical portion 104a, the small-diameter cylindrical portion 104b, the boundary step portion 104c, Step
The first return spring 7 is interposed between the first return spring 7 and the second return spring 63c.

The balls 105 are steel balls having a diameter of about 0.6 mm, and are rotatably supported so as to protrude from the inner and outer peripheral surfaces of the retainer 104 inward and outward by about 0.1 mm. .

The plunger 94 has a hollow shape in which the connecting screw 94 is screwed into the screw 74a on the outer periphery of the hammer 74 and the supporting hole 94b of the punch 9 is opened in the lower end region, and the large diameter cylindrical portion of the retainer 104 is provided. The outer shape is such that a large-diameter shaft portion 94c is continuously formed in the upper half portion and a small-diameter shaft portion 94d is continuously formed in the lower half portion in correspondence with the small diameter cylindrical portion 104b and the small diameter cylindrical portion 104b, and a stripper 11 is provided at the lower end.

The punch 9 has a punch diameter of 30 μm to 10 μm.
Mainly 0 micron, it is fitted in the support hole 94b, and is stopped in a state in which the tip portion is projected from the plunger 94 with a set screw 94f that is screwed into a stop hole 94e provided laterally from the outside of the plunger 94. .

The retainer 104 described above has a ball 10
5 are fitted inside the large-diameter hole portion 63a of the fitting insertion hole 63 so as to be able to slide on the inner peripheral surface of the small-diameter hole portion 63b, and the plunger 94 is small in diameter with the large-diameter shaft portion 94c. Shaft 94d is the ball
105 are slidably fitted in the large-diameter cylindrical portion 104a and the small-diameter cylindrical portion 104b of the retainer 104 in a state where they are slightly elastically deformed, and do not come off from above with a stopper 53a provided on the upper inner periphery of the sleeve 53. It has become.

Therefore, the punching tool 4 can be replaced by removing the plunger 94 from the coupling 64 and replacing it with the plunger 94 on which a new punch 9 is set. (FIG. 4).

The plunger mechanism 84 has an air flow path 114 communicating with the cylinder rod 54 and the hammer 74 and communicating with the plunger 94.
A small air passage 124 along the punch 9 is provided around the b, and an outlet 124a of the small air passage 124 is opened at the lower end of the plunger 94 so that a part of the driving air is supplied to the air flow passage 114 and the small air passage 124.
Through the stripper 11.

The stripper 11 is formed in a bag shape from an elastic material such as a soft resin, and has a punch 9 and an outlet 12 of a small air passage 124.
4a, the lower end of the plunger 94 is detachably engaged with the lower end of the plunger 94.
a is opened.

The work table 5 has an upper surface serving as a reference surface on which the work 100 moves, and a large number of dies 15 facing the punch 9.
Is replaceably embedded in a buried shape, and below the punching hole 15a of the die 15, an air jetting path 15b for jetting air toward the punch 9 from around the punch 9 projecting from the punching hole 15a is opened. The lower end opening of the punching hole 15a is connected to a vacuum device (not shown) for collecting the punching tip.

The punching mechanism A having such a configuration
When the driving source 8 is driven to supply air to the selected piercing tool 4, the compressed air pushes the cylinder rod 54 to lower the plunger 94, and the piercing mark (not shown) attached to the workpiece 100. Punch out). In addition, the stripper 11 has an elastic function that a part of the compressed air enters the inside through the air passage 114 and the small air passage 124 in parallel with the work 100 being crushed and the punch hole 11a being closed. Then, the air compressed internally is blown out at once from the punch hole 11a that opens when the punching tool 4 retreats toward the adhering tip adhering to the punch 9, and at the same time, air is ejected from the air ejection passage 15b. The attached chip is peeled off from the device and collected by a suction action of a vacuum device (not shown). Further, the guide of the plunger 94 associated with the punching motion of the punch 9 is scattered around the upper and lower portions of the retainer 104 and slightly elastically deformed by the plunger 94.
The guide of the retainer 104 at that time is performed by the point contact between the inner peripheral surface of the large-diameter hole portion 63a of the insertion hole 63 and the inner peripheral surface of the small-diameter hole portion 63b. The punch 9 having a very small diameter of about 30 to 100 microns slides with a small impact resistance and repeats a rectilinear motion without inclination.
Work 100 sent by X moving mechanism 6a and Y moving mechanism 6b
A very fine hole having a predetermined shape is formed in a predetermined portion of the substrate.

In this embodiment, the diameter of the ball 105 is set so as to obtain the straightness of the punch 9 having a diameter of about 30 μm to 100 μm. A ball having a diameter of 0.6 mm or more may be used.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of a punching mechanism.

FIG. 2 is a partially enlarged cross-sectional view of a punching mechanism, showing a state in which a hole is punched.

FIG. 3 is a front view of a punching device including the punching mechanism according to the embodiment.

FIG. 4 is a perspective view showing an exchange state of a punch.

[Explanation of symbols]

 A: Punching mechanism 4: Punch 9: Punch 3: Punch holder 8: Driving source 15: Dice 100: Work 6: Moving part 104: Retainer 63a: Large diameter hole 63b: Small diameter hole 104a: Large diameter cylinder 104b: Small-diameter cylinder part 105: Ball 94: Plunger 94c: Large-diameter shaft part 94d: Small-diameter shaft part 63: Fitting hole

Claims (3)

[Claims] A punch having a plunger having an external appearance and having a large diameter portion and a small diameter portion connected vertically in a vertical direction; a large diameter hole portion and a small diameter hole portion vertically connected to each other; A piercer holder for detachably supporting the jar, a plunger, and a retainer interposed between the piercer holder; the retainer includes a large-diameter portion and a small-diameter portion of the plunger, and a large-diameter hole of the piercer holder. It has a cylindrical shape having a large-diameter tube portion and a small-diameter tube portion corresponding to the small-diameter hole and the small-diameter hole portion. The large-diameter tube portion and the small-diameter tube portion protrude in and out to support fine-diameter balls in a dispersed and rotatable manner. The retainer is slidably fitted so that the ball can slide on the inner peripheral surface of the large-diameter hole portion and the inner peripheral surface of the small-diameter hole portion of the piercing tool holder. With slightly elastic deformation, the retainer A punching mechanism characterized by being slidably fitted in a large-diameter tube portion and a small-diameter tube portion. 2. A punching mechanism according to claim 1, wherein said punch has a diameter, a long side or a short side of 100 microns or less. 3. A small air passage is formed in the plunger, which communicates with the drive source and injects air from a lower end portion of the plunger adjacent to the punch in synchronization with a stroke of the plunger. A stripper formed of a soft elastic material surrounding the punch including the outlet of the small air passage is provided at the lower end of the plunger, and the stripper has a punch hole closed by a work at the time of hitting. 3. The punching mechanism according to claim 1, wherein