JPS5917449Y2 - hole punching device - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology belongs to a technical field in which a device for forming a relatively large diameter hole in a thin steel plate consists of a die and a punch.

Therefore, in this invention, a die is placed on a U-shaped frame, the above-mentioned thin steel plate, etc. is set on the die, and the operating rod is pressed downward by a pressing device provided on the frame, and the same frame is placed on the die. This relates to a device for shearing holes in the thin plate using a punch provided at the tip of the operating rod in conjunction with a rotating device provided at the A punch shaft mounted on the tip of an operating rod has a punch at its tip, and is tilted at a set angle with respect to the axis of the operating rod so as to be freely supported by a bearing so as to rotate relative to a punching plate. This is related.

As is well known, in the automobile manufacturing industry, for example, there are various types of drilling and punching operations, and various types of equipment are used to punch holes in thin steel sheets depending on the size of the sheet.

Therefore, in the case of drilling a relatively small hole with a diameter of about 50φ, it is generally necessary to attach a so-called hole saw type cutting tool to a drilling machine, electric drill, etc., and drill the hole by cutting.
For punching holes larger than φ, there were methods such as using a press device using punches and dies.

However, as mentioned above, the former method is limited to small-diameter holes and requires a cutting process, which has the disadvantage of poor efficiency.

Therefore, this kind of means has the disadvantage that it cannot cope with punching holes of 50φ or more.

On the other hand, in the latter case, it is possible to punch holes with a desired large diameter, but
A press device with a large pressurizing force of ton class is required, and the device is also large and has the disadvantages of high initial cost, cumbersome operation, and high power cost.

The purpose of this invention is to take into account the problems of the two extreme hole punching devices based on the prior art described above, and to reduce the strength of the device parts by rotating the punch at an angle with respect to the die, with a small power and pressure. It is an object of the present invention to provide an excellent hole punching device capable of punching a hole of a desired diameter.

The structure of this invention, which meets the above objectives, is to place a work plate on a die provided on a frame, lower the operating rod through a pressing device, and simultaneously rotate the operating rod and the punch at its tip using a rotating device. The punch is brought into contact with the set work, and the punch stops rotating due to the friction, and due to the rotation and pressure of the operating rod, the punch shaft, which is mounted on a bearing and is tilted at a set angle with respect to the operating rod, rotates on its own axis. Therefore, the cutting edge of the punch moves up and down sequentially to apply cutting force, punching the work plate at the punch diameter in cooperation with the die, and the pressing force is small, requiring less power, and the rotation The gist is that force and reaction force are received by bearings, and punching is performed smoothly by aligning the axis intersection of the operating rod and punch shaft, and the punch cutting edge surface. There is.

Next, one embodiment of this invention will be described below based on the drawings.

1 is a hole punching device that embodies the gist of this invention, in which a die 4 having a diameter of a set size is replaceably fixed to the lower surface of a set channel 3 of a C-shaped frame 2 fixed to a base.
Moreover, a sub-frame 5 is fixedly installed on the upper part thereof, and an air cylinder 6 as a pressing device is fixedly placed thereon.

The air cylinder 6 is connected to a compressed air tank (not shown) through a solenoid valve 8 interposed in a pipe 7, and a foot switch 9 is connected to a solenoid (not shown) of the solenoid valve 8.
A cord 10 is connected between the power source and a power source (not shown).

As shown in FIG. 2, an operating rod 14 having a spline 13 on the upper part is connected downwardly to the piston 11 of the air cylinder 6 through a thrust bearing 12.
4 is mounted to the frame 2 via bearings 15 and 16 so that it can be raised and lowered.

Further, a motor 1 as a rotating device fixed to the frame 2
A belt 21 is stretched between the pulley 18 of No. 7 and a pulley 20 which is rotatably provided on a roller bearing 19 provided in the subframe 5 but cannot be raised or lowered and engages with the spline 13. It is designed to allow rotation while allowing for vertical movement.

As shown in FIG. 3 in detail, the tip of the operating rod 14 has an axis that is inclined at a set steradian angle θ with respect to the axis 22 of the operating rod 14, which is the same as the axis of the die 4. The punch shaft 24 has radial bearings 25, 26 .
27, and a punch which is freely supported by a shaft via a thrust bearing 28, and has a back taper of about θ+2° with respect to the axis 23 at its tip to prevent damage to the die due to biting with the workpiece. 29 is fixed by a key screw 30 along a plane perpendicular to the axis 23, and its cutting edge surface 31 intersects with the intersection 32 of the coaxial center so as to have a certain clearance with the die 4. has been done.

The workpiece 33 is a thin steel plate to be punched, and is set on the die 4 in a set posture.

In the above-mentioned configuration, a thin steel plate 33 as a workpiece is inserted into the channel 3 of the hole punching device 1 equipped with a punch 29 and a die 4 corresponding to a predetermined hole diameter between 50φ and 100φ, and the set portion is inserted into the hole punch 29 and the die 4. When the foot switch 9 is pressed against the spring (not shown), the solenoid valve 8 is activated, the air cylinder 6 is activated, and the piston 11 is activated.
The operating rod 14 is pressed down, and at the same time, the motor 1 is
7, the pulley 20 connects to the spline 13.
The operating rod 14 is rotated via the .

Therefore, the punch 29 at the lower end of the operating rod 14 also rotates as a unit and descends to come into contact with the thin steel plate 33.

Therefore, the punch 29 stops its rotation due to the cutting resistance, but the operating rod 14 continues to be pressed down and rotated, so the punch shaft 24 receives a moment due to the freely supported inclined shaft, and the shaft center The key screw 30 begins to revolve around the axis 22 in an inverted conical shape around the intersection 32 of 22.23.
The punch 29 integrated with the punch shaft 24 begins to tilt and rotate, and its blade surface sequentially moves and presses the cutting edge against the thin steel plate 33, causing each point of the cutting edge to move up and down, and as a result, cooperates with the die 4. Then, a cutting force is applied to the thin steel plate 33 like a pair of scissors, and a hole of a predetermined diameter is punched out with a slight rotation.

During this time, since the blade surface 31 coincides with the intersection of the coaxial centers 22 and 23, the punch 29 can cut while maintaining a certain minute clearance with respect to the die 4, and the back taper of the punch bites into the thin steel plate 33, causing the die to Prevent damage to 4.

In addition, the reaction force in the punching process mentioned above is caused by the thrust bearing 2.
8, and the rotational force in the slip state when the punch 29 stops rotating is received by the radial bearings 25, 26, and 27.

After drilling is completed, when the pedal force is released from the foot switch 9, the electromagnetic valve 8 is switched, the air cylinder 6 raises the operating rod 14, the motor 17 is stopped, and the machine is in a reset state in preparation for the next drilling.

In an experiment based on the above example, a 120φ air ring was used to drill a 100φ hole in a thin steel plate with a thickness of 0.8mm, and a factory air of 5kg/cm2.
When the punch angle was reduced to 0 revolutions/min and the punch angle θ was set to 3°, the punch was successfully punched with two rotations of the punch, and the pressing force was 1/2.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment; for example, the motor and operating rod may be gear-engaged or chain-driven, and the pressing device may be a crank mechanism, and various other embodiments may be adopted. It is possible.

As mentioned above, according to this invention, the device is basically small and compact when punching holes in thin steel plates, etc., and requires minimal electric power compared to a press device, and is easy to operate.
Therefore, the pressure resistance of the frame etc. can be lowered as much as possible, the weight can be reduced, manufacturing is easy, and the cost can be reduced.

In addition, the diameter of the punched hole is too large for conventional press equipment, and the relatively large diameter of 50 to 1
It has the effect of being able to freely punch out a 00φ round hole.

Since the punch is installed at the lower end of the operating rod which is rotated and lowered by the pressing device and the rotating device so that the coaxial center is inclined at a set angle, a cutting action similar to a type of scissor cutting is performed. During cutting, one part of the punch blade cooperates with the die blade to cut, so even though the cutting pressure is extremely small, a round hole of the set diameter can be freely punched. Excellent effects are achieved.

Further, by arranging the punch shaft to be freely supported with respect to the operating rod via a bearing, there is an effect that the pulling reaction force and the sliding force of the cutting process can be received by the bearing.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of one embodiment of this invention; FIG. 1 is an explanatory overall external view, FIG. 2 is an explanatory diagram of the operating rod support, and FIG. 3 is an explanatory diagram of the correspondence between a punch and a die. 2... Frame, 6... Pressing device, 1
4... Operating rod, 17... Rotating device, 2
9...Punch, 1...Drilling device, 2
2.23...Axis center, 25-28...Bearing, θ...Angle.

Claims (1)

[Scope of utility model registration request] In a hole-making device that has a punch at its tip and is linked to an operating force rotating device connected to a pressing device that is also fixed to the frame for a die installed on a frame, the operating rod and the axis of the die are A hole punching device characterized in that a punch shaft that coincides with the operating rod and is loosely mounted on the lower end of the operating rod via a bearing is provided with its axis intersecting the operating axis at a set angle.