JP3590663B2 - Drilling equipment for hollow shaft tubes for office automation equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method and apparatus for piercing a hollow shaft tube used in OA equipment such as a word processor, a facsimile, a printer, and a copying machine.
[0002]
[Background of technology]
OA equipment such as copiers, word processors, and facsimile machines use many shaft members for paper feeding, paper holding, transfer, etc., and generally use solid steel materials. However, this solid material is heavy and expensive, and for the purpose of weight reduction and cost reduction by saving materials, the present inventor has previously disclosed Japanese Patent Application Nos. 61-291775 and 3-103868. Has proposed a means of using a hollow shaft pipe in which the contents are omitted and made into a pipe shape.
[0003]
[Prior art]
When attaching a roller or the like to the hollow shaft tube, it is necessary to make a hole in order to mount a ring or the like. After positioning, it must be drilled in several places.
However, in this conventional means, it is necessary to perform drilling one by one in accordance with the number of holes, so that there are disadvantages in that the number of work steps is large, the cost is high, and the drilling position is inaccurate.
[0004]
[Problems to be solved by the invention]
Then, the present inventor paid attention to the feature of the hollow shaft tube formed relatively thinly, and studied a method of punching by a punching method.
However, in the case of punching, generation of burrs is unavoidable, and if you continue drilling work with this burr as it is, the burr will scrape the core metal, it will not be able to withstand long-term use, and at the same time heat will be generated due to friction Intense, causing problems such as burning and deformation.
Further, according to the punching method, there is a problem that scum is generated after punching, which remains in the hole and causes clogging.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks, and has improved the punching method to solve the above-mentioned problem caused by the generation of burrs, and has developed an apparatus in which no scrap remains.
[0005]
[Means for Solving the Problems]
The piercing device for a hollow shaft tube for an OA device according to the present invention has a lower mold portion and an upper mold portion provided with piercing pins that can penetrate the hollow shaft tube by a pressing force of a press machine or the like. Between the lower mold portion and the upper mold portion, a core band portion in which a through groove through which a burr can pass is formed on the side surface at the same position as the outer diameter of the hollow shaft tube at a portion where a through hole for penetration is located. In addition to forming the core tube portion, a valley portion for guiding a burr into the insertion groove was formed between the core band portion and the core tube portion, and a core tube portion having a hole for blowing out a scum was formed therein. Arrange the metal core. An extrusion mechanism for extruding the hollow shaft tube inserted into the cored bar is formed.
[0006]
[Action]
The hollow shaft tube is inserted into the cored bar, the lower mold portion and the upper mold portion are pressed by a press or the like, and the piercing pin is passed through the hollow shaft tube. Then, a part of the wall is punched to form a hole, but burrs remain on the inner wall of the hole.
[0007]
Then, the extrusion mechanism is operated to slide the hollow shaft tube, and the perforated portion where the burr is formed is moved to the valley portion of the core band, and the contact between the burr and the core band is released. Next, the hollow shaft tube is rotated about an axis, and the position of the hole is adjusted to the insertion hole. Then, when the hollow shaft tube is pulled out along the insertion hole, the burr does not come into contact with the core band portion due to the depth of the groove, and can be pulled out smoothly. There is no generation of high heat.
[0008]
The scum generated by punching accumulates in the holes of the cored bar. However, if compressed air is sent for a certain period of time, the scum is not blown off by the pressure and does not accumulate.
[0009]
【Example】
The apparatus of the present invention comprises a lower mold part 10 for supporting a hollow shaft tube S as a workpiece from below and projecting a piercing pin, and an upper mold part 20 for supporting the hollow shaft tube S from above and penetrating a piercing pin from above. And a core part 30 for supporting the hollow shaft tube S from the inside by inserting the hollow shaft tube S, and an extruding mechanism part 40 for moving the hollow shaft tube S inserted to the core part.
[0010]
In the lower mold part 10, a lower mold 12 is placed on a base 11, and a lower mold board 13 is arranged thereon with an elastic body 16 such as urethane rubber interposed therebetween. The lower mold base 13 is supported by an elastic body 16, and a guide rod 15 is vertically inserted between the lower base 13 and a pressing rod 14 that determines a pressing width when pressed from the upper base.
Then, a semicircular groove 13a having a diameter corresponding to the outer diameter of the hollow shaft tube S as a workpiece is formed at substantially the center of the head end surface of the lower die base 13. A perforation pin 17 is set up with its lower end screwed to the lower base 12 so as to face the bottom surface of the groove 13a.
[0011]
The upper mold section 20 is provided with an upper base 22 having a connecting section 21 arranged on the head for connecting to pressing means such as a press machine (not shown), and under the upper base 22 an elastic body 25 such as urethane rubber is sandwiched. Place. The upper base 23 receives the pressing force from the upper base 22 via the elastic body 25, but stands up the guide rod 15 extending from the lower base 12 for vertical movement. Further, a pressing rod 24 for determining the pressing width is provided.
A semi-circular groove 23a having a diameter corresponding to the outer diameter of the hollow shaft tube S is formed substantially at the center of the bottom end surface of the upper mold base 23 in the same manner as the lower mold section 10, and the bottom surface of the groove 23a is exposed. Then, the perforation pin 26 is erected with its lower end screwed to the lower base 12.
[0012]
The piercing pins 17 and 26 of the lower mold part 10 and the upper mold part 20 exemplify a type that pierces the hollow shaft tube S in the vertical direction. However, as shown in FIG. A part of the lower base 12 of the portion 10 is formed on an inclined surface, and a perforation pin 17 is erected on the inclined surface via an elastic body 16.
[0013]
As shown in FIG. 1, the metal core portion 30 includes a metal core tube 31 having at least the length of the hollow shaft tube S. When the hollow shaft tube S is inserted into a portion of the core metal cylinder 31 which is a drilling position, that is, a portion where through holes 34, 34. A core band 35 having the same size as the outer diameter of the hollow shaft tube S is provided so as to be closely supported from the inside.
On the side surface of the core band portion 35, for example, at a position perpendicular to the through hole 34, a burr generated inside the hole of the hollow shaft tube S is brought into contact with the surface of the core metal tube 31 in cooperation with a valley portion described later. An insertion groove 36 for allowing the hollow shaft tube S to pass therethrough is formed in parallel with the drawing direction of the hollow shaft tube S.
At the end of the core band 35, a slide cylinder 37 is provided, which pushes back the hollow shaft tube S that has been pressed and inserted into the extrusion mechanism 40 described later.
[0014]
Further, the contact between the burr and the core band 35 is cut off between the core band 35 and the core band 35, and the burr is inserted into the insertion groove 36 provided at a right angle to the above-mentioned through hole 34. A valley 33 is formed to cut a groove in the radial direction in order to guide the groove.
[0015]
Further, as described above, the inside of the core metal tube 31 accumulates scum punched by the perforation pins 17 and 26 and forms a hole 32 for blowing the scum with compressed air described later.
[0016]
The push-out mechanism 40 is for pushing back the hollow shaft tube S attached to the cored bar 30, and is joined to a slide tube 37 disposed at the end of the cored bar 31 of the cored bar 30, and has four A slide frame 41 comprising a slide rod 42 is provided, and is connected to a cylinder 44 which reciprocates at a port 45 via a rod 43. The cylinder 44 may be either an air cylinder or a hydraulic cylinder.
[0017]
The slide frame 41 is provided with a stop plate 46 for stopping the slide rod 42 at a fixed position, a through hole is formed in the center thereof, and a pile rod 47 extending from the base 11 is inserted therethrough. A communication hole 46a for communicating compressed air with the hole 32 of the metal core tube 31 is formed in a part of the stop plate 46.
[0018]
Next, the operation of the present embodiment will be described.
First, in using the present apparatus, the cored bar 30 formed in accordance with the drilling position of the hollow shaft tube S is mounted in the apparatus. The perforation position is determined by the position of an E-ring for fixing a functional member such as a paper feed roller.
[0019]
Next, the hollow shaft tube S to be processed is inserted into the inner portion that comes into contact with the slide cylinder 37 so as to cover the cored bar portion 30 sandwiched between the lower mold portion 10 and the upper mold portion 20. The insertion may be performed by a feeding device (not shown) using a cylinder or manually.
[0020]
When the upper base 22 of the upper mold section 20 is pressed by a press machine or the like, the elastic body 25 contracts due to the pressing force, and the upper base 22 descends. When the upper base 22 reaches the key portion of the pressing rod 24, the pressing rod 24 is transmitted. The upper mold base 23 is pressed as a medium.
The pressing force to the upper mold base 23 is transmitted to the lower mold base 13 as it is, and pushes down the pressing rod 14, and stops when the key portion of the pressing rod 14 contacts the lower base 12.
[0021]
Now, when the upper die base 23 and the lower die base 13 are lowered, the piercing pins 17 fixed to the lower base 12 and erected act as a reaction force on the lower die base 13, and the head end is a hollow shaft. It penetrates the lower wall surface of the pipe S. At the same time, as the upper base 22 descends, the piercing pins 26 fixed downwardly of the upper base 22 penetrate the upper wall surface of the hollow shaft tube S.
At this time, the vertical movement of the upper mold base 23 and the lower mold base 13 moves accurately in the vertical direction because the guide rod 15 is inserted through both.
[0022]
Then, as shown in FIGS. 5 (A), 5 (B) and 5 (C), the penetrating pins 17 and 26 reach the inside of the wall of the hollow shaft tube S and are partially punched out, that is, the pins 17 and A hole having the same inner diameter as the outer diameter of 26 is formed.
However, at this time, burrs are inevitable between the lower end of the wall surface of the hollow shaft tube S punched and the core metal tube 31.
Therefore, if this is pulled out as it is, sharp burrs will scrape off the surface of the metal core tube 31. If this operation is continued many times, the surface of the metal core tube 31 will be shaved and the function as a core will be lost. Will be At the same time, when being pulled out while being scratched by burrs, extremely frictional heat is generated there, and the temperature of the hollow shaft tube S and the core metal tube 31 as a metal body becomes high, which causes a burning phenomenon and deformation.
[0023]
Therefore, in the apparatus of the present invention, first, the cylinder 44 of the push-out mechanism 40 is operated to slide the slide rod 42 of the slide frame 41, and the abutting slide tube 37 pushes the hollow shaft tube S in the pulling direction. The extrusion distance is set in advance, and is set as the distance at which the hole of the hollow shaft tube S is inserted into the valley portion 33 of the core metal tube 31. Then, when extruded to the valley portion 33, as shown in FIG. 5 (D), the burr generated on the periphery of the hole faces the groove of the valley portion 33, and the contact with the core band portion 35 is released.
[0024]
Next, the hollow shaft tube S is rotated substantially perpendicularly in the radial direction by a delivery mechanism or manually, so that the position of the hole of the hollow shaft tube S matches the insertion groove 36 of the burr of the core metal cylinder 31 (see FIG. 6A). At this time, the valley portion 33 is formed to have a bottom depth deeper than the length of the burr, so that the burr rotates lightly without touching. When the hollow shaft tube S is pulled out as it is, the burrs move along the insertion groove 36, so that the burrs do not come into contact with the core band portion 35, and the generation of scratches and high heat occurs. No (see FIG. 6B). The force required for the extraction is minimal.
[0025]
In addition, scum generated during the punching is accumulated in the holes 32, but is wiped out by the compressed air sent out from the communication holes 46a of the stop plate 46 at regular intervals.
[0026]
【The invention's effect】
In the present invention based on the above configuration, the hollow shaft tube can be pierced by the punching means, so that the number of steps can be reduced and the production can be performed extremely labor-saving, and the position of the hole to be pierced is also accurate. Quality can also be improved in terms of accuracy. At that time, contact with the core metal cylinder due to burrs can be minimized, eliminating problems such as damage to the core metal and generation of frictional heat, and complete process control in actual practice. It has an excellent effect that it can be performed.
[Brief description of the drawings]
FIG. 1 is an enlarged perspective view of a main part of a partially cut-out device of the present invention.
FIG. 2 is a vertical sectional front view of the device of the present invention.
FIG. 3 is a vertical side view of the device of the present invention.
FIG. 4 is a partially longitudinal side view showing another embodiment of the device of the present invention.
5A and 5B are schematic views showing the operation of the device of the present invention, wherein FIG. 5A shows a state before punching, FIG. 5B shows a state when punching through, FIG. 5C shows a state when returning, and FIG.
FIGS. 6A and 6B are cross-sectional views illustrating the operation of the apparatus of the present invention, wherein FIG. 6A shows a state before rotation after punching, and FIG. 6B shows a state after drawing after rotation.
FIG. 7 is a partially cutaway perspective view of a hollow shaft tube to which the device of the present invention is applied after drilling.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 lower mold part 11 base 12 lower stand 13 lower mold stand 13 a groove 14 pressing rod 15 guide rod 16 elastic body 17 piercing pin 20 upper dies 21 connecting part 22 upper pedestal 23 upper pedestal 24 pressing rod 25 elastic body 26 piercing pin 30 Core metal part 31 Core metal cylinder 32 Void hole 33 Valley part 34 Through hole 35 Core band part 36 Insertion groove 37 Slide cylinder 40 Pushing mechanism 41 Slide frame 42 Slide rod 44 Cylinder
46 Stop plate 46a Communication hole 47 Piling rod

Claims (1)

It has a lower mold part and an upper mold part in which a piercing pin that can penetrate the hollow shaft tube by the pressing force of a press machine,
Between the lower mold portion and the upper mold portion, a core band portion in which a through groove through which a burr can pass is formed on the side surface at the same position as the outer diameter of the hollow shaft tube at a portion where a through hole for penetration is located. In addition to the above, a valley portion for guiding burrs into the insertion groove was formed between the core band portion and the core band portion, and a core tube portion having a hole for blowing out a scum was formed therein. Arrange the metal core,
A punching device for a hollow shaft tube for OA equipment, wherein an extrusion mechanism for extruding a hollow shaft tube inserted into the cored portion is formed.

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