JP2011104679A - Rotary cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply cutting oil from a cutting oil tank to a cutting blade, even when a cutting device is mounted in an optional direction. <P>SOLUTION: This rotary cutting device includes a motor, a body for storing the motor, the cutting blade provided in the body to be rotated by the motor, and the cutting oil tank provided in the body, and supplies the cutting oil to the cutting blade by gravity. The cutting oil tank is provided with a plurality of vent holes. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotary cutting apparatus provided with a cutting fluid supply device for a rotary cutting blade of a rotary cutting apparatus such as an electric drill. About.

  A conventional technique will be described with reference to FIG. The structure shown in FIG. 10 is the structure used in products sold by Hitachi Koki Co., Ltd.

  A conventional rotary cutting apparatus includes a main body 1 having a motor (not shown) and a shaft portion 3 driven and connected to a motor output shaft via a gear train (not shown) including a bevel gear 2. And a feed mechanism 7 for cutting and cutting a cutting blade 5 (annular cutting blade in the illustrated example) attached to the lower end of the rotating shaft 4 with respect to the workpiece 6. An electromagnetic base 8 attached to the lower end of the main body 1 is provided for fixing the main body 1 to the material 6, and a cutting oil tank 9 is fixed to the upper portion of the main body 1. A motor switch 10 for starting and stopping the motor and an electromagnet switch 11 for starting and stopping the electromagnet of the electromagnetic base 8 are disposed at appropriate positions of the main body 1. A handle 12 is disposed at an upper position of the main body 1.

  The rotary shaft 4 is attached to the apparatus main body 1 so as to be rotatable around the rotation axis, and a drawing position where the overlap is large in the axial direction with the shaft portion 3 as shown in FIG. 10 and a small overlap in the axial direction are shown. It is movable between no extended positions. A set screw 13 (locking member) is provided at the tip of the rotary shaft 4 to hold the cutting blade 5.

  The feed mechanism 7 is attached to the case 14, and includes a rack 7a arranged on a straight line extending in parallel with the rotation axis, a pinion (not shown) engaged with the rack 7a, the rack 7a, and the rotation shaft 4. The quill base 7b is fastened. The rotating shaft 4 is fastened to the quill base 7b via a ball bearing 17 so as to be rotatable with respect to the quill base 7b.

  The rotary shaft 4 is formed with a cutting fluid passage 18 penetrating along the rotation center axis, and a valve rod 19 is provided in the cutting fluid passage 18 so as to be movable in the axial direction. An oil seal 20 is disposed at the lower end of the rotating shaft 4.

  The cutting oil tank 9 has a vent 9a, a cutting fluid injection hole 9c, a cutting fluid injection hole lid 9d, and a discharge port 9b communicating with the cutting fluid receiving port 24 at the upper end of the cutting fluid passage 18 of the main body 1. is doing.

  A rotating valve (not shown) is provided at the lower portion of the cutting fluid inlet 24, and the rotating valve is adjusted by a rotating lever (not shown).

  When the rotary cutting device is used at a construction site or the like, the rotary cutting device may need to be tilted in accordance with the workpiece 6 to perform work. The main body 1 is fixed to the workpiece 6 such that the air vent 9 a of the cutting oil tank 9 is positioned at an air portion 16 generated above the cutting fluid inside the cutting oil tank 9. Further, the liquid level of the cutting fluid 23 in the cutting oil tank 9 at this time is set to be higher than the cutting fluid supply position in the rotary cutting device.

  In the above configuration, when the cutting operation is not performed, the rotating shaft 4 is in the retracted position. When performing the cutting work, the main body 1 is disposed on the workpiece 6 and the electromagnet switch 11 is turned on. The main body 1 is fixed to the workpiece 6 by an electromagnet. The turning valve is turned by a turning lever so that the cutting fluid 23 in the cutting oil tank 9 flows into the cutting fluid passage 18 through the discharge port 9b and the cutting fluid receiving port 24. When the motor switch 10 is turned on, the motor is activated, whereby the shaft portion 3 rotates through the gear train, the rotating shaft 4 rotates, and the cutting blade 5 rotates. The pinion is rotated by rotating the feed handle 21 attached to one end of the central rotation shaft of the pinion outside the main body 1 while rotating the cutting blade 5. Thereby, the rack 7a moves downward, and the quill base 7b, the rotating shaft 4, and the cutting blade 5 also move downward. Until the cutting blade 5 comes into contact with the workpiece 6, the valve member 19 a at the lower end of the valve rod 19 engages with the oil seal 20 disposed at the lower end of the rotating shaft 4 to close the cutting fluid passage 18. When the cutting blade 5 is lowered and comes into contact with the workpiece 6, the valve rod 19 is lifted by the center pin 22 as the cutting blade 5 descends, and the valve member 19 a at the lower end of the valve rod 19 is sealed with the oil seal 20. Then, the cutting fluid passage 18 is opened and the cutting fluid 23 is supplied to the cutting blade 5.

  As described above, in the prior art, the cutting fluid level is lower than the cutting fluid supply position, and it becomes impossible to supply the cutting fluid, or the cutting fluid level is higher than the vent and the vent is removed from the vent. There was a problem that the cutting fluid leaked out.

  The object of the present invention is to eliminate the disadvantages of the prior art described above, and to supply cutting fluid even when the inclination of the rotary cutting device is relatively large, and to prevent the cutting fluid from leaking. It is to provide a cutting device.

A motor, a main body that accommodates the motor, a cutting blade that is provided on the main body and is rotated by the motor, and a cutting oil tank that is provided on the main body; The above-mentioned problem can be solved by a rotary cutting device that supplies a plurality of vent holes to the cutting oil tank.

Air can flow into the cutting oil tank from the plurality of vent holes. For this reason, cutting oil is efficiently supplied to the cutting blade.
Further, since the plurality of vents can be opened and closed simultaneously by one member, the cutting oil can be efficiently supplied to the cutting blade by a simple operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view including a partial cross-section showing a first embodiment of a rotary cutting device according to the present invention (showing a state in which a rotary cutting device is in a vertical state for drilling work). It is A arrow view including the partial cross section of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view including a partial cross-section showing a first embodiment of a rotary cutting device according to the present invention (showing a state in which a rotary cutting device is in a vertical state for drilling work). It is a side view including the partial cross section which shows 2nd Embodiment (The state which carries out a drilling operation | work by making a rotary cutting device into a perpendicular state) of the rotary cutting device which becomes this invention. It is a B arrow view including the partial cross section of FIG. It is CC sectional drawing of the state of FIG. 4 of the state which open | released the vent hole. It is CC sectional drawing of the state of FIG. 4 of the state which closed the vent hole. It is a side view including the partial cross section which shows 3rd Embodiment (The state which performs a drilling operation | work with the rotary cutting apparatus made into a perpendicular state) of the rotary cutting apparatus which becomes this invention. It is DD sectional drawing of the state of open | released the vent hole of FIG. It is a side view including a partial cross section of a rotary cutting device (showing a state in which a rotary cutting device is in a vertical state for drilling work) according to the prior art.

  A first embodiment of the present invention will be described with reference to FIGS.

  The rotary cutting device of the present invention is a product generally called a magnetic drilling machine.

  In FIG. 1, as indicated by arrows, a cutting oil tank direction, a cutting blade direction, a motor direction, and an anti-motor direction are defined.

  This rotary cutting device has a main body 1 provided with an electric motor inside. In addition, it has a case 14 connected to the main body 1. Inside the case 14 is a shaft portion 3 that is drivingly connected to the output shaft of the motor via a gear train (not shown) including the bevel gear 2 and a rotary shaft 4 that is splined to the shaft portion 3. Contained.

  A cutting blade 5 having an annular cutting blade is attached in the cutting blade direction of the rotary shaft 4. A feed mechanism 7 for moving the cutting blade in the tank direction or the cutting blade direction is provided.

  An electromagnetic base 8 is provided in the direction of the cutting blade of the main body. A cutting oil tank 9 is provided in the direction of the cutting oil tank of the case 14. A motor switch 10 for starting and stopping the motor and an electromagnet switch 11 for starting and stopping the electromagnet of the electromagnetic base 8 are disposed at appropriate positions of the main body 1. A handle 12 is provided in the direction of the cutting oil tank of the main body 1. When the electromagnet switch 11 is operated, the electromagnetic base 8 can be fixed to the workpiece 6 made of metal by a magnetic force.

  The rotating shaft 4 is attached to the main body 1 so as to be rotatable around a rotating shaft center, and is between a retracting position having a large overlap in the axial direction and an extending position (not shown) having a small overlapping in the axial direction. It is supposed to be movable. A set screw 13 (locking member) is provided at the tip of the rotary shaft 4 to hold the cutting blade 5.

  The feed mechanism 7 is attached to the case 14, and includes a rack 7a arranged on a straight line extending in parallel with the rotation axis, a pinion (not shown) engaged with the rack 7a, the rack 7a, and the rotation shaft 4. The quill base 7b is fastened. The rotating shaft 4 is fastened to the quill base 7b via a ball bearing 17 so as to be rotatable with respect to the quill base 7b.

  The rotary shaft 4 is formed with a cutting fluid passage 18 penetrating along the rotation center axis, and a valve rod 19 is provided in the cutting fluid passage 18 so as to be movable in the axial direction. An oil seal 20 is disposed at the lower end of the rotating shaft 4.

  The cutting oil tank 9 has five vents 9 a, a cutting fluid injection hole 9 c, a cutting fluid injection hole lid 9 d, and a discharge port connected to the cutting fluid inlet 24 at the upper end of the cutting fluid passage 18 of the main body 1. 9b. The main body of the cutting oil tank 9 is a fixed wall side portion 9e fixed to the rotary cutting device, a peripheral wall portion 9f rising from the peripheral portion of the fixed wall side portion 9e to the side opposite to the rotary cutting device main body side, and a fixed wall portion 9e and a top wall portion 9g attached to the peripheral wall portion 9f at a predetermined interval. One vent hole 9a is provided on the top wall portion 9g and four on the peripheral wall portion 9f. The four vents 9a of the peripheral wall portion 9f are disposed at the center portions of the front, rear, left and right surfaces of the cutting oil tank 9 body. Each vent 9a is provided with a lid 9h.

  A rotating valve (not shown) is provided at the lower portion of the cutting fluid receiving port 24, and the rotating valve is rotated and adjusted by a rotating lever 15.

  In the above configuration, when the cutting operation is not performed, the rotating shaft 4 is in the retracted position. When performing the cutting work, the main body 1 is disposed on the workpiece 6 and the electromagnet switch 11 is turned on. The main body 1 is fixed to the workpiece 6 by an electromagnet. Opening the lid 9h of the vent located at the air portion 16 generated above the cutting fluid 23 inside the cutting oil tank 9 causes the air inside the cutting oil tank 9 to communicate with the outside air, and the rotary valve is moved by the rotary lever 15. The rotation is adjusted, and the cutting fluid 23 in the cutting oil tank 9 is caused to flow into the cutting fluid passage 18 through the discharge port 9b and the cutting fluid receiving port 24. When the motor switch 10 is turned on, the motor is activated, whereby the shaft portion 3 rotates through the gear train, the rotating shaft 4 rotates, and the cutting blade 5 rotates. The pinion is rotated by rotating the feed handle 21 attached to one end of the central rotation shaft of the pinion outside the main body 1 while rotating the cutting blade 5. Thereby, the rack 7a moves downward, and the quill base 7b, the rotating shaft 4, and the cutting blade 5 also move downward. Until the cutting blade 5 comes into contact with the workpiece 6, the valve member 19 a at the lower end of the valve rod 19 engages with the oil seal 20 disposed at the lower end of the rotating shaft 4 to close the cutting fluid passage 18. When the cutting blade 5 is lowered and comes into contact with the workpiece 6, the valve rod 19 is lifted by the center pin 22 as the cutting blade 5 descends, and the valve member 19 a at the lower end of the valve rod 19 is sealed with the oil seal 20. Then, the cutting fluid passage 18 is opened and the cutting fluid 23 is supplied to the cutting blade 5.

  Since the cutting oil tank 9 is provided with a plurality of vents 9a at arbitrary positions and each vent 9a is provided with a lid or a plug 9h, the cutting fluid 23 can be vented regardless of the angle of the rotary cutting device. There is no leakage. Further, since the opening / closing vent 9a can be selected, the liquid level position of the cutting fluid 23 in the cutting oil tank 9 can be made relatively high, and cutting can be performed even if the inclination of the rotary cutting device is made relatively large. The liquid 23 can be supplied.

  Further, according to FIG. 4 as the second embodiment, the cutting oil tank 9 is provided with a plurality of vent holes 9a at arbitrary positions, and the vent holes 9a are provided with at least one or more openings 25a. Since the ring-shaped lid 25 can be opened and closed by rotating around the central axis of the cutting oil tank 9, the cutting fluid 23 does not leak from the vent 9a regardless of the angle of the rotary cutting device. . Further, since the opening / closing vent 9a can be selected, the liquid level position of the cutting fluid 23 in the cutting oil tank 9 can be made relatively high, and cutting can be performed even if the inclination of the rotary cutting device is made relatively large. The liquid 23 can be supplied. Further, the lid 9h can be opened and closed at a time, and the lid 9h is not forgotten to close other than the necessary opening / closing positions.

  Further, according to the third embodiment as shown in FIG. 8, the tank 9 is provided with a plurality of vents 9a at arbitrary positions, and the vents 9a are provided on the rod-shaped member 26 and a plurality of plugs 26a are provided. Since it can be opened and closed by the opening and closing device, the cutting fluid 23 does not leak from the vent 9a regardless of the angle of the rotary cutting device. Further, since the opening / closing vent 9a can be selected, the liquid level position of the cutting fluid 23 in the tank 9 can be made relatively high, and the cutting fluid 23 can be obtained even if the inclination of the rotary cutting device is made relatively large. Can be supplied. Further, the lid 9h can be opened and closed at a time, and the lid 9h is not forgotten to close other than the necessary opening / closing positions.

  1 is a main body, 2 is a bevel gear, 3 is a shaft, 4 is a rotary shaft, 5 is a cutting blade, 6 is a workpiece, 7 is a feed mechanism, 8 is an electromagnetic base, 9 is a cutting oil tank, and 10 is a motor switch. , 11 is an electromagnetic switch, 12 is a handle, 13 is a set screw, 14 is a case, 15 is a rotating lever, 18 is a cutting fluid passage, and 21 is a feed handle.

Claims (2)

A motor,
A main body for housing the motor;
A cutting blade provided on the main body and rotated by the motor;
A cutting oil tank provided in the main body,
A rotary cutting device that supplies the cutting oil to the cutting blade by gravity,
A rotary cutting device comprising a plurality of vent holes in the cutting oil tank. The plurality of vents have a first vent and a second vent,
A first state constituted by a state in which the first vent is opened and a state in which the second vent is closed; a state in which the first vent is closed; and the second vent. The rotary cutting device according to claim 1, further comprising a second state constituted by an open state and a separable opening / closing member.