JP2001277018A - Workpiece holding device of drilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out smooth continuous machining by uniformly pressurizing the periphery of a drilling position of a workpiece and speedily collecting chips produced by drilling. SOLUTION: A lower end of a cylindrical pressing part 22 makes contact with an upper part of a workpiece 42 by lowering an elevating head 30 of a drilling machine, and when the elevating head 30 is further lowered, the cylindrical pressing part 22 energized downward by a spring 225 uniformly pressurizes a circumference of a drilling position. While machining, an air chamber is likely formed by an inside of the cylindrical pressing part 22 pressurized on the workpiece 42 and an inside of a cover part 21 installed on the elevating head 30 and cut chips in the cylindrical pressing part 22 fly up in the air chamber by an air current from an air supply port 21a of the cover part 21, and are simultaneously, sucked from a suction port 21b of the cover part 21 and discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece holding device for a drilling machine, and more particularly, to holding and drilling a workpiece in which a plurality of thin plates are stacked when the workpiece is drilled by the drilling machine. The present invention relates to a workpiece holding device for a drilling machine for removing chips generated at the time.

[0002]

2. Description of the Related Art To pierce a thin plate material used for an aircraft body part or the like, a veneer disc 2 is placed on a table 1 as shown in FIG. Thin sheet 3
Are laminated, and the laminated thin plate 3 is pierced by a drill 4 of a piercing machine. However, when the laminated thin plate 3 is pierced, there is a problem in that the chips 5 penetrate between the laminated thin plates 3 due to lifting of the laminated thin plate by drilling at the time of drilling, and the processing surface is damaged by the chips.

In order to solve such a problem, various types of workpiece holding devices for preventing chips 5 from entering between the laminated thin plates 3 have been proposed.

As the above-mentioned workpiece holding device, there is one proposed by the present applicant and disclosed in Japanese Utility Model Laid-Open No. 62-11509. The workpiece holding device includes a cylindrical base attached to a spindle of a drilling machine, and a plurality of spring-loaded pressing pads attached to the base. The plurality of pressing pads are arranged so as to surround the drill of the drilling machine, abut against the laminated thin plate as the spindle of the drilling machine descends, and press the laminated thin plate by further descending.

[0005] However, the above-mentioned Japanese Utility Model Application Laid-Open No.
In the work holding device disclosed in Japanese Patent Application Publication No. H07-27, a plurality of pressing pads locally press the laminated thin plate around the drill, and the laminated thin plate cannot be uniformly pressed.
There was a problem that it was not possible to sufficiently prevent chips from entering between the laminated thin plates, and it was not possible to completely eliminate the floating phenomenon of the laminated thin plates.

Therefore, the present applicant has proposed a workpiece holding device which solves the above-mentioned problems of the prior art (registered utility model No. 2557260). Referring to FIG. 4, the work holding support will be described with reference to FIG. 4. The pressing member 10 has a ring 13 concentric with the drill 4 of the drilling machine at one end thereof, and a lower surface of the ring 13. A first elastic body 14 is fixed concentrically, and a second elastic body 15 is fixedly provided on the lower surface of the other end of the pressing member 10. And
When the lifting head 7 of the drilling machine is lowered, the lower end 11a of the cylinder type spring 11 comes into contact with the upper surface of the other end 10b of the pressing member 10 and presses the first and second elastic members via the pressing member 10. , Whereby the first and second elastic members 14,
15 is a laminated thin plate 3 fixed to a base 17 with bolts 18
When the pressing force reaches a set value, the lowering of the elevating head 7 temporarily stops, and thereafter, the drill 4 is rotated down to perforate the laminated thin plate 3.

According to this workpiece holding device, the first elastic body 14 uniformly presses the entire periphery of the perforation position, so that cutting chips are prevented from intruding between the laminated thin plates 3 and completely laminated. Floating of the thin plate 3 can be prevented. Also,
The chips generated at this time are discharged from the opening 14a of the first elastic body 14 by air.

[0008]

However, the above-mentioned workpiece holding device (registered utility model No. 2557260)
Although it is possible to uniformly press the entire periphery of the drilling position, the chips generated there accumulate inside the first elastic body. It is necessary to remove chips by using an air nozzle, which makes it impossible to carry out a continuous operation smoothly, resulting in a problem that the operation time is lengthened. In addition, since the generated chips are scattered around the workplace using an air nozzle,
There is a problem that it takes time to clean the chips in the work place.

The present invention has been proposed in order to address such a problem of the prior art, and can uniformly press the periphery of a drilling position of a workpiece and cut the workpiece by the drilling. It is an object of the present invention to propose a workpiece holding device capable of recovering powder quickly and enabling smooth continuous operation.

[0010]

In order to achieve the above object, the present invention relates to a workpiece holding device for a punching machine for punching a plurality of laminated workpieces on a base, The workpiece holding device is mounted below the lifting head of the drilling machine and surrounds a tool of the lifting head.The lower end of the lifting head projects from the lower opening of the cover portion when the lifting head descends. A cylindrical pressing portion that abuts against the workpiece and presses the cylindrical pressing portion. The cylindrical pressing portion is slidable in the axial direction in the cover portion and held by being spring-biased downward, and is held by the cover portion. An air supply port connected to an air supply means for sending an airflow into the cylindrical pressing portion,
And a suction port connected to a suction means for sucking chips generated in the cylindrical pressing member together with the airflow.

According to the above construction, the lower end of the cylindrical pressing portion abuts on the workpiece by lowering the elevating head of the drilling machine, and when the elevating head is further lowered, the cylinder urged downward by the spring. The pressing portion uniformly presses around the perforated position. At the time of processing, an air chamber is formed between the inside of the cylindrical pressing portion pressed on the workpiece and the inside of the cover mounted on the elevating head, and the inside of the cylindrical pressing portion generated at the time of processing is formed. Is soared into the above-mentioned air chamber by an air current from an air supply port provided in the cover, and is simultaneously sucked and discharged from a suction port provided in the cover.

According to this, since the periphery of the drilling position is uniformly pressed by the cylindrical pressing portion, it is possible to prevent chips from entering between the laminated thin plate-shaped workpieces, and to completely process the workpiece. Since it is possible to prevent the lifting of the object, and furthermore, the chip is sucked and discharged at the same time as the perforation, and the dust is collected in the suction means.
Chips generated by perforation are promptly removed to enable smooth continuous operation, and there is no trouble in collecting the chips.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a workpiece holding device according to one embodiment of the present invention. FIG. 1 (a) is a partial cross-sectional view as viewed from the side, and FIG. I have. The workpiece holding device 20 includes a cover portion 21 and a cylindrical pressing portion 22. The cover portion 21 forms a skeleton of the mounting member 211 for mounting the boring machine on a lifting head and a cover portion 21. The column 212 is formed by a cover 213 which forms the side surface of the cover portion 21 and surrounds the tool of the lifting head, and a ring 214 which forms a lower opening of the cover portion 21. The cylindrical pressing portion 22 is provided with a protective member 221 at the lower end in contact with the workpiece, is prevented from falling off by a pin 222, and is projected and held from a ring 214 forming a lower opening of the cover portion 21. I have. In addition, the cylindrical pressing portion 22 includes a pin
2 is slidably held in the cover portion 21 by sliding in the slide groove 212a formed in the cylindrical pressing portion 22.
A spring is provided downward by a coil spring 225 disposed between a ring-shaped plate packing 223 abutting on the upper surface of the cylinder and sliding with the cylindrical pressing portion 22 and a ring-shaped plate 224 fixed above the support column 212. It is being rushed.

The cover 21 has an opening in the slide groove 212a below the support column 212, and a cylindrical pressing portion 22.
Air supply port 2l communicating with air outlet 22a
a, and a suction port 21b that opens inside the cover portion 21 above the cover 213 is provided. And
The air supply port 21a has a hose 2 from the air supply means.
3, and a suction hose 24 extending to the suction means is connected to the suction port 21b.

FIG. 2 shows a state in which the workpiece holding device 20 is mounted on an elevating head 30 of a drilling machine (the same reference numerals are given to the portions shown in FIG. 1 and the description is partially omitted). Do). The cover unit 21 is mounted below the elevating head 30 by the mounting unit 221, and surrounds the spindle 31 and the cutter 32 provided below the elevating head 30. Further, the cylindrical pressing member 22 is
Alternatively, it is arranged concentrically with the axis of the cutter 32,
It surrounds the side of the cutter 32. The coil spring 225 in the cover is disposed so as to surround the spindle 31. Reference numeral 40 denotes a base, 41 denotes a workpiece protection material, and 42 denotes a workpiece, which is a laminated thin plate member.

The operation of the above embodiment will be described. When the lifting head 30 of the drilling machine is lowered from the state shown in FIG. 2, first, the protection member 221 provided at the lower end of the cylindrical pressing portion 22 is provided.
Abuts on the workpiece 42. When the raising / lowering head 30 is further lowered, before the tip of the cutter 32 hits the workpiece 42, the cylindrical pressing portion 22 is biased by the coil spring 225 to uniformly press and hold the periphery of the punching position of the workpiece 42. I do.

Then, by further lowering the elevating head 30, drilling is performed by the cutter 32 as shown in FIG. At this time, an air chamber is formed between the inside of the cylindrical pressing portion 22 pressed by the workpiece 42 and the inside of the cover portion 21, and is supplied by air supply from the hose 23 and suction through the suction hose 24. Then, an air flow (arrow in FIG. 3) for discharging the chips generated by the processing is generated in the air chamber. That is, the air supplied from the hose 23 flows into the cylindrical pressing portion 22 from the air supply port 21a through the slide groove 21a and the air blowout port 22a to form an airflow, and the airflow forms chips during processing. The powder is sowed in the cylindrical pressing portion 22, and further, the swarf soared in the suction port 21 b by suction by the suction means is collected by the suction hose 24.

According to the above embodiment, since the periphery of the perforation position is uniformly pressed by the cylindrical pressing portion 22, it is possible to prevent chips from entering between the laminated thin plate-shaped workpieces, and to completely cut the chips. In addition, it is possible to prevent the workpiece from being lifted up.In addition, the chips are sucked and discharged at the same time as the drilling, and the dust is collected in the suction means, so that a smooth continuous operation can be performed. Absent.

In this embodiment, the pressing portion has a cylindrical shape. However, the pressing portion is not limited to a cylindrical shape as long as the laminated plate cannot be lifted by the workpiece and the flow of air has no stagnation and chips can be removed. The drilling machine may be either automatic or manual.

[0020]

Since the present invention is configured as described above,
Provided is a workpiece holding device of a drilling machine that can uniformly press the periphery of a drilling position of a workpiece, and quickly collects chips generated by the drilling to enable smooth continuous operation. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a workpiece holding device according to one embodiment of the present invention, wherein FIG.
FIG. 2B is a plan view as viewed from above.

FIG. 2 is an explanatory view showing a state in which the workpiece holding device according to one embodiment of the present invention is mounted on a lifting head of a drilling machine.

FIG. 3 is an explanatory view showing the operation of the workpiece holding device according to one embodiment of the present invention.

FIG. 4 is an explanatory view showing a workpiece holding device of a conventional drilling machine.

FIG. 5 is an explanatory view showing a conventional drilling process.

[Explanation of symbols]

 Reference Signs List 20 Workpiece holding device 21 Cover part 21a Air supply port 21b Suction port 211 Mounting member 212 Support column 213 Cover 214 Ring 22 Cylindrical pressing part 22a Air blowing port 221 Protective material 222 Pin 223 Plate packing 224 Plate 225 Coil spring 23 Hose 24 Suction hose

Claims (1)

[Claims] 1. A workpiece holding device for a drilling machine for punching a plurality of thin plate-shaped workpieces stacked on a base, wherein the workpiece holding device is provided below a lifting head of the drilling machine. A cover for surrounding the tool of the elevating head, and a cylindrical pressing protruding from a lower opening of the cover and pressing the lower end of the elevating head against the workpiece when the elevating head is lowered. The cylindrical pressing portion is slidable in the axial direction within the cover portion and held by being biased downward by a spring. The cover portion has an air supply for feeding an airflow into the cylindrical pressing portion. An air supply port connecting the means,
A workpiece holding device for a boring machine, comprising: a suction port connected to a suction means for sucking chips generated in the cylindrical pressing member together with an air flow.