JP3898373B2 - Annular cutter and apparatus for attaching / detaching the annular cutter - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an annular cutter in a drilling device used for drilling relatively deep holes in a hard material such as a steel plate, and an attaching / detaching device for the annular cutter, and more particularly to an annular cutter on the surface of a workpiece during the drilling operation. The present invention relates to an annular cutter for preventing side-slip of a drilling device due to biting of the blade edge and chatter during cutting, and an attachment / detachment device for the annular cutter.
[0002]
[Prior art]
As is well known, a drilling device for hard material generally has a structure in which a drilling body (annular cutter) provided with a drilling blade at the lower end is rotated and a drilling operation is performed while feeding at a constant speed. In this device, since it is necessary to replace the annular cutter in accordance with the diameter of the hole to be drilled in the hard material during the drilling operation, various annular cutter attaching / detaching devices have been conventionally used so that the annular cutter can be easily replaced. Has been developed.
A typical configuration of such an annular cutter attaching / detaching apparatus will be described with reference to the drawings. FIG. 3 is a side view showing a state in which the cutter is attached to the arbor when the attaching / detaching apparatus is not perforated, and FIG. The principal part side view and front view at the time of perforation of the apparatus, FIG.
In the drawing, detailed description of the configuration other than the attaching / detaching device is omitted here.
In FIG. 3, reference numeral 1 denotes an arbor, and this arbor 1 is mounted on a drilling machine (not shown) so that rotation and feed necessary for the drilling operation are transmitted from the drilling machine. An insertion hole 1a is formed at the center of the arbor 1, and cutting oil can be supplied to the insertion hole 1a from a flow path (not shown).
[0003]
A seal member 12 is disposed in the insertion hole 1a, and a flow path opening / closing valve body 11 is mounted on the seal member 12. The flow path opening / closing valve body 11 is pressed toward the seal member 12 (downward in the drawing) by a spring 13 disposed in the insertion hole 1a of the arbor 1, and these cooperate to form a valve. ing. FIG. 3 shows a state in which the flow path is closed by the valve body 11 and the seal member 12, and the cutting oil supplied into the insertion hole 1a does not flow downward. When the arbor 1 moves toward the workpiece W during the drilling operation in which the annular cutter is attached to the arbor 1, the center pin 8 of the annular cutter 6 contacts the workpiece W. The center pin 8 pushes up the valve body 11 against the urging force of the spring 13 to open the flow path, and the cutting oil can flow downward.
[0004]
On the lower end side of the arbor 1, an accommodation hole 7a of a locking member for mounting the annular cutter 6 (in this embodiment, a ball, hereinafter referred to as a locking member) 7 is formed in a tapered shape toward the center of the insertion hole 1a. The locking member 7 is disposed in the accommodation hole 7a. A plurality of the receiving holes 7a are provided in the circumferential direction of the insertion hole 1a. On the other hand, corresponding to the locking member 7, a support member 2 when the locking member 7 protrudes inside the insertion hole 1a is disposed in the insertion hole 1a. The support member 2 has a recess 2 a for receiving the locking member 7 in a half-projected state, and is biased downward by a spring 3 disposed between the locking member 10 and the support member 2. When the insertion portion 9 of the annular cutter 6 enters the insertion hole 1 a of the arbor 1, the support member 2 is in the illustrated state against the urging force of the spring 3 by the insertion portion 9 of the annular cutter 6. It is configured so as not to interfere with the insertion of the annular cutter 6.
[0005]
A small-diameter portion 1b having a small outer diameter is formed on the outer peripheral surface of the lower end of the arbor 1 where the locking member 7 is disposed, and a sleeve 4 for engaging the annular cutter 6 is fitted into the small-diameter portion 1b. Is done.
As shown in FIG. 5, the sleeve 4 has a ring shape, and a recess 4 a for accommodating the return spring 5 is formed on the entire circumference of the one surface. Further, a first control surface 4a for accommodating the locking member 7 and a second control surface 4b for pushing the locking member 7 in the radial direction are formed on the inner peripheral surface of the sleeve 4 as conventionally known.
[0006]
A return spring 5 is accommodated in the recess 4c. One end of the return spring 5 is fixed to the arbor 1 side and the other end is fixed to the sleeve 4 side. The sleeve 4 is urged and maintained so that the locking member 7 is normally pushed into the insertion hole 1 a of the arbor 1 by the return spring 5 while being fitted to the small diameter portion 1 b of the arbor 1. The sleeve 4 and the locking member 7 constitute a locking mechanism for mounting the annular cutter 6 to the arbor 1.
[0007]
The annular cutter 6 attached to the annular cutter attaching / detaching device has a plurality of blades at the lower end, and is formed in a cylindrical shape having an opened lower end. As shown in FIG. 4, an engagement recess 9 b that engages with a locking member passage surface 9 a that passes through the locking member 7 in a half-projected state is formed in the insertion portion 9 of the annular cutter 6. Further, a center pin 8 for perforating positioning is provided in the center portion of the annular cutter 6 so as to be freely inserted and withdrawn. The center pin 8 is prevented from dropping downward from the annular cutter 6 by a head 8a formed at the upper portion. It is prevented.
[0008]
The operation of the annular cutter attaching / detaching device having the above-described configuration will be described. When mounting the annular cutter 6, a part 7 b of the locking member 7 is held by the support member 2 in a state of being semi-projected inside the insertion hole 1 a of the arbor 1 by the first control surface 4 a of the sleeve 4. The insertion portion 9 of the annular cutter 6 is inserted into the insertion hole 1a of the arbor 1 in this state. Then, when the insertion portion 9 of the annular cutter 6 pushes the support member 2 and passes through the locking member passage surface 9a with the locking member 7 being partially projected, the locking portion 7 is locked. The member 7 falls into the engaging recess 9b connected to the locking member passage surface 9a. When this state is reached, the sleeve 4 returns to the initial position by the urging force of the return spring 5, and the locking member 7 is securely locked to the engaging recess 9b by the second control surface 4b. Thus, the annular cutter 6 is attached to the arbor 1. To remove the annular cutter 6, when the sleeve 4 is rotated in the circumferential direction against the urging force of the return spring 5, the locking member 7 and the first control surface 4 a coincide with each other. The pressing by the second control surface 4b is eliminated, and the locking member 7 can escape into the first control surface 4a of the sleeve 4 and pull out the annular cutter 6 downward. At this time, the support member 2 is pushed out by the elastic force of the spring 3 in the insertion hole 1a of the arbor, and the locking member 7 is held in a half-projected state, so that the annular cutter 6 can be mounted .
[0009]
[Problems to be solved by the invention]
By the way, the annular cutter attaching / detaching device has been improved to a one-touch type in which the annular cutter can be easily attached from the conventional fixing by screwing. As a result, only the three locking members receive both the thrust of the annular cutter and the cutting torque when cutting the workpiece. In addition, the outer diameter of the insertion portion is not limited to a small diameter or a large diameter, and the outer diameter of the insertion portion is set to the same diameter so that it can be mounted in the insertion hole of one arbor. By adopting such a structure, the efficiency of exchanging and attaching the annular cutter by conventional screwing and fixing, and the hole machining accuracy by the misalignment between the axis of the arbor and the axis of the annular cutter were improved. However, when the annular cutter is attached to the arbor, there is a gap between the inner diameter of the insertion hole and the outer diameter of the insertion portion, whereby the annular cutter is held only by the three locking members, and the blade portion of the annular cutter is As the diameter increases, the lower side becomes heavier, and when the arbor is rotated, the annular cutter rotates while the lower end is swung with the locking member as a fulcrum.Therefore, lateral displacement caused by the blade biting on the surface of the workpiece and chatter during cutting It was found to occur.
[0010]
Therefore, the present invention is designed so that a gap is generated between the locking member and the lower surface of the engaging recess when the annular cutter is attached to the arbor so as to be in an operating state, and the rotational force is applied to the second control surface of the sleeve and the locking member. And an annular cutter in which the thrust is transmitted by contact of the three portions of the engaging recess and the thrust is received by the contact between the lower end surface of the arbor and the shoulder of the annular cutter, and an attachment / detachment device for the annular cutter. The purpose is to solve the problem.
[0011]
[Means for Solving the Problems]
For this reason, the technical solution means adopted by the present invention is:
In an annular cutter having a cylindrical cutter body having a distal end provided with a cutting blade and a proximal end, and an insertion portion extending coaxially with respect to the cutter body from the proximal end of the cutter body, The insertion portion is adapted to be inserted into an insertion hole of an arbor for attaching the annular cutter to the punching device, and in the inserted state, the locking portion projects from the radially outer side of the arbor. An engagement recess that is engaged by the member, thereby mounting the insertion portion against the arbor, the engagement recess being an engagement surface above the engagement recess center and a lower non-engagement surface In the state where the insertion portion is inserted into the insertion hole, the locking member can be engaged only with the engagement surface, and the base end of the cutter body is connected to the arbor. Abuts on the end face provided with the insertion hole Be cyclic cutter, characterized in that is configured to be the ability.
A piercing device comprising an arbor having an insertion hole that opens to a free end surface and receives and holds the insertion portion of the annular cutter, wherein the arbor has a storage hole that penetrates the peripheral wall of the insertion hole in the radial direction; A locking member housed in the housing hole so as to be displaceable in a radial direction; and an operating sleeve mounted on the peripheral wall so as to be movable between a first position and a second position, And a second control surface that is radially inward of the first control surface that is aligned with the storage hole when in the second position. An operating sleeve having an inner peripheral surface, a spring for biasing the operating sleeve toward the second position, and the first portion of the operating sleeve when the insertion portion of the cutter is not inserted into the insertion hole. Pressed into the insertion hole by the control surface A locking member that engages with the locking member and holds the locking member in a semi-entry state in the insertion hole, whereas, when inserted into the insertion hole at the distal end A locking member passage surface through which the half-recessed locking member can pass, a bearing member abutting portion that abuts against the bearing member and releases the holding of the locking member by the bearing member, and passes through the locking member When the insertion portion is inserted into the insertion hole by a predetermined depth, it is aligned with the locking member, allowing the locking member to be displaced radially inward, An operating recess that is biased by the spring is allowed to move to the second position and thereby engages a locking member that is displaced radially inward by the second control surface and has an engaging recess for locking. Insert section and multiple cutting blades are provided When the annular cutter composed of a cylindrical cutter body having a distal end and a proximal end is mounted on the arbor and pressed against the workpiece to be cut, the insertion portion has a storage formed on the arbor. One end of the locking member in the hole is in contact with the upper engagement surface from the center of the engagement recess, the lower non-engagement surface is disengaged, and the other end of the lock member is the second control surface of the sleeve The cutting torque is transmitted in contact with the cutter, and in the cutter body, the base end is brought into contact with the end face of the arbor where the insertion hole is provided to receive thrust. An attachment / detachment device for the annular cutter.
[0012]
【Example】
Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of the annular cutter attaching / detaching device according to the first embodiment of the present invention in a drilling operation state, and the basic configuration is the above-described conventional example. Since this is the same as the above, the characteristic part of the present embodiment will be mainly described. The same reference numerals denote the same members as those of the conventional example.
In FIG. 1, reference numeral 1 denotes an arbor, and this arbor 1 is mounted on a drilling machine (not shown) so that rotation and feed necessary for a drilling operation are transmitted from the drilling machine. An insertion hole 1a is formed at the center of the arbor 1, and cutting oil can be supplied to the insertion hole 1a from a flow path (not shown).
[0013]
A seal member 12 is disposed in the insertion hole 1a, and a flow path opening / closing valve body 11 is mounted on the seal member 12. The flow path opening / closing valve body 11 is pressed toward the seal member 12 (downward in the drawing) by a spring 13 disposed in the insertion hole 1a of the arbor 1, and these cooperate to form a valve. ing.
[0014]
The small-diameter portion 1b formed at the lower end of the arbor 1 has an accommodation hole 7a of a locking member for attaching an annular cutter 6 (in this embodiment, a ball, hereinafter referred to as a locking member) 7 toward the radially inner side of the insertion hole 1a. The locking member 7 is arranged in the accommodation hole 7a. A plurality of holes (3 in this example) are provided in the circumferential direction of the insertion hole 1a. On the other hand, corresponding to the locking member 7, a support member 2 when the locking member 7 protrudes inside the insertion hole 1a is disposed in the insertion hole 1a. The support member 2 has a recess 2 a that holds the locking member 7 in a half-projected state, and is biased downward by a spring 3 disposed between the support member 2 and the locking ring 10. The support member 2 resists the biasing force of the spring 3 by the insertion portion 9 of the annular cutter 6 when the insertion portion 9 of the annular cutter 6 enters the insertion hole 1a of the arbor 1 (becomes shown in the drawing). Thus, it is pushed upward in the state shown in the figure, and does not interfere with the insertion of the annular cutter 6.
[0015]
A sleeve 4 for engaging the annular cutter 6 is fitted to the outer periphery of the lower end small diameter portion 1b of the arbor 1 on which the locking member 7 is disposed. The sleeve 4 has a ring shape, and a recess 4c for accommodating the return spring 5 is formed on the entire circumference of one surface thereof. A first control surface 4a for accommodating the locking member 7 and a second control surface 4b for pushing the locking member 7 radially inward are formed on the inner peripheral surface of the sleeve 4 (see FIG. 4). A return spring 5 is accommodated in the recess 4c. One end of the return spring 5 is fixed to the arbor side, and the other end is fixed to the sleeve 4 side. The sleeve 4 is normally urged by the return spring 5 to be pushed into the insertion hole 1a of the arbor 1 while being fitted to the small diameter portion 1b of the arbor 1. The insertion hole 1a The locking member 7 is brought into a semi-projecting state by the recess 2a of the inner support member 2, and the sleeve 4 is urged and held in the releasing direction by being locked to the first control surface 4a. As described above, the sleeve 4 and the locking member 7 constitute a locking mechanism for mounting the annular cutter 6 to the arbor 1.
[0016]
On the other hand, the blade portion 6b of the annular cutter 6 attached to the apparatus for attaching and detaching the annular cutter is formed in a cylindrical shape having an open lower end and has a large number of blades at the tip thereof. The insertion portion 9 of the annular cutter 6 is formed with a locking member passage surface 9a through which the locking member 7 can be passed in a half-projected state and an engaging recess 9b (conical shape in the embodiment). The engagement recess 9b formed so as to have a small diameter inward in the radial direction is the lower end surface 1c of the arbor 1 when the annular cutter 6 is drilling the workpiece W in a state where the annular cutter 6 is mounted on the arbor 1. And the shoulder 6a of the annular cutter 6 are formed so as to contact each other as shown. Further, one end of the locking member 7 is in contact with the side surface above the center of the engaging recess 9b and the other end is in contact with the second control surface 4b of the sleeve 4 so that the cutting torque can be transmitted. As long as the engagement recess 9b has a shape that can transmit only the cutting torque to the annular cutter 6 without receiving thrust during operation as described above, various shapes such as an oval, a circle, and a groove can be adopted.
[0017]
Further, the lower end face 1c of the arbor 1 is always used when the annular cutter 6 is drilled in order to prevent the annular cutter 6 from being shaken by the centrifugal force with the locking member 7 as a fulcrum when drilling. And the shoulder 6a of the annular cutter 6 must be in contact with each other. For this purpose, a similar effect can be obtained by interposing a washer or the like between the lower end surface 1c of the arbor 1 and the shoulder 6a of the annular cutter 6. Can be obtained.
A center pin 8 for perforation positioning is provided in the center of the annular cutter 6 so as to be freely inserted and removed. The center pin 8 is prevented from dropping downward from the annular cutter 6 by a head 8a formed on the upper portion. Has been.
[0018]
The operation of the annular cutter attaching / detaching device having the above-described configuration will be described.
[Removal operation of the annular cutter 6]
When the annular cutter 6 is mounted, since a part 7b of the locking member 7 protrudes inside the insertion hole 1a, the sleeve 4 is rotated in the circumferential direction to accommodate the locking member 7 and the locking member 7. 1 The control surface 4a is aligned, and the locking member 7 is held by the support member 2 in a state of partially protruding inside the insertion hole 1a of the arbor 1, and the insertion portion of the annular cutter 6 is inserted into the insertion hole 1a of the arbor 1 in this state 9 is inserted. Then, when the insertion portion 9 of the annular cutter 6 pushes the support member 2 and the locking member 7 is fitted in the insertion hole 1a through the locking member passage surface 9a in a half-projected state, the locking member 7 is engaged. It falls into the joint recess 9b. In this state, the sleeve 4 is opened and returned to the initial position by the urging force of the return spring 5, and the locking member 7 is firmly locked to the engaging recess 9b by the second control surface 4b. Thus, the annular cutter 6 is attached to the arbor 1.
When the sleeve 4 is rotated in the circumferential direction against the urging force of the return spring 5, the annular cutter 6 is removed because the locking member 7 and the first control surface 4 a coincide with each other. The pressing by the control surface 4b is eliminated, and the locking member 7 can escape into the first control surface 4a of the sleeve 4 and pull out the annular cutter 6 downward.
[0019]
[Relationship between locking member and engaging recess during operation of annular cutter 6]
When the annular cutter 6 is processing the workpiece W, the lower end surface 1c of the arbor 1 and the shoulder 6a of the annular cutter 6 always come into contact with each other as shown in FIG. . In this state, the lower surface 9c of the engaging recess 9b has a sufficient shape so that a gap 21 is formed between the engaging recess 9b and the locking member 7 so that the locking member 7 receives thrust as in the prior art. Instead, only the cutting torque is transmitted to the annular cutter 6 by the abutment of the second control surface 4b of the sleeve 4, the locking member 7, and the side surface 9d above the engaging recess 9b. In this way, the shoulder 6a of the annular cutter 6 is always in contact with the lower end surface 1c of the arbor 1 during the operation, so that the arbor lower end surface 1c and the shoulder 6a of the annular cutter 6 are interposed as in the prior art. No gap is generated, and the annular cutter 6 does not vibrate.
[0020]
Next, the configuration of the annular cutter attaching / detaching device according to the second embodiment of the present invention will be described with reference to FIG.
The second embodiment is characterized in that a step is formed on the shoulder 6a of the annular cutter 6, and the other configuration is the same as that of the first embodiment. Therefore, the first embodiment will be described while focusing on the characteristic portion. Parts common to form use the same symbols.
In FIG. 2, the small diameter portion 1b formed at the lower end of the arbor 1 is provided with a receiving hole 7a of the locking member 7 for mounting the annular cutter 6 in a tapered shape toward the center of the insertion hole 1a. A locking member 7 is disposed in the accommodation hole 7a. A plurality of the receiving holes 7a are provided in the circumferential direction of the insertion hole 1a. On the other hand, corresponding to the locking member 7, a support member 2 when the locking member 7 protrudes inside the insertion hole 1a is disposed in the insertion hole 1a. The support member 2 has a recess 2 a for receiving the locking member 7 in a half-projected state, and is biased downward by a spring 3 disposed between the locking member 10 and the support member 2.
[0021]
A sleeve 4 for engaging the annular cutter 6 is fitted to the outer periphery of the lower end small-diameter portion 1b of the arbor 1 where the locking member 7 is disposed, and the sleeve 4 is fitted in the small-diameter portion 1b of the arbor 1 The return spring 5 always keeps the locking member 7 in a state of being pushed out into the insertion hole 1 a of the arbor 1. A tapered surface 31 is formed on the outer periphery of the lower end surface of the arbor 1. The sleeve 4 and the locking member 7 constitute a locking mechanism for mounting the annular cutter 6 to the arbor 1.
[0022]
On the other hand, the blade portion 6b of the annular cutter 6 attached to the arbor 1 is formed in a cylindrical shape having an open lower end and has a large number of blades at the tip thereof. The insertion part 9 of the annular cutter 6 is formed with an engaging recess 9b that engages with a locking member passage surface 9a that passes through the locking member 7 in a semi-projecting state, as in the first embodiment. Further, a center pin 8 for perforating positioning is provided in the center portion of the annular cutter 6 so as to be freely inserted and withdrawn. The center pin 8 is prevented from dropping downward from the annular cutter 6 by a head 8a formed at the upper portion. It is prevented. A shoulder portion 6 a of the annular cutter 6 is formed with a step portion 32 that contacts the free end portion of the arbor. A taper portion 31 corresponding to the taper portion 34 formed at the lower end of the arbor is formed on the inner peripheral wall of the step portion 32, and when the annular cutter 6 is attached to the arbor 1, as shown in FIG. The tapered portion 31 of the inner peripheral wall is in contact with the tapered portion 34 formed at the lower end of the arbor, and a gap 33 is formed between the lower end surface of the arbor 1 and the bottom surface of the stepped portion.
[0023]
When the annular cutter 6 according to the second embodiment is connected to the arbor 1, as shown in FIG. 2, the tapered portion 31 of the inner peripheral wall of the step portion 32 and the tapered portion 34 formed at the lower end of the arbor contact each other, Thereby, the thrust at the time of work can be received. Further, in this state, the lower surface of the engaging recess 9b has a sufficient shape so that a gap 21 is formed between the locking member 7 and the thrust acting on the locking member 7 as in the prior art. Only the cutting torque is transmitted to the annular cutter 6. In this way, a part of the shoulder 6a of the annular cutter 6 always abuts against the lower end of the arbor during the operation, so that the arbor lower end surface 1c and the shoulder 6a of the annular cutter 6 are located as in the conventional case. In this case, no gap is generated, and the annular cutter 6 does not vibrate. Note that the inner peripheral wall of the step portion 32 formed on the shoulder portion 6a of the annular cutter 6 is not necessarily limited to a tapered shape, and various shapes can be used as long as the shape can contact the periphery of the lower end surface 1c of the arbor 1. It is possible to adopt a shape.
[0024]
Moreover, the said Example is only one of the Examples of this invention, A sleeve can be made into a screwing type, or the cylindrical body which has the same function can be used instead of a locking member. Furthermore, the number of locking members attached to the arbor side can also be set as appropriate, so that by matching the shape of the annular cutter side, it is possible to carry out a finer selection operation of the annular cutter. Various annular forms can be implemented without departing from the spirit or key features of the present invention, such as the selection of an annular cutter suitable for drilling operations can be made. For this reason, the above-described embodiments are merely examples in all respects and should not be interpreted in a limited manner.
[0025]
【The invention's effect】
As described above in detail, according to the present invention, the locking member and the insertion portion of the storage hole formed in the second control surface and the arbor of the sleeve only for the cutting torque during the operation in which the annular cutter processes the workpiece. Since the arbor's free end surface and the shoulder of the annular cutter are in contact with each other, the arbor's free end surface and the annular cutter shoulder are conventionally used during drilling operations. There is no gap between the two parts, and an excellent effect that the vibration of the annular cutter can be surely prevented can be obtained.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view of an annular cutter attaching / detaching device according to a first embodiment of the present invention during a drilling operation.
FIG. 2 is a side cross-sectional view of the annular cutter attaching / detaching device according to the second embodiment of the present invention during a punching operation.
FIG. 3 is a side cross-sectional view of a conventional annular cutter attaching / detaching device when it is not perforated.
FIGS. 4A and 4B are a side sectional view and a front view of a main part when a conventional annular cutter attaching / detaching device is perforated. FIGS.
FIG. 5 is a cross-sectional view of a locking recess portion in a conventional cutter mounting state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Arbor 1a Insertion hole 1b Small diameter part 1c Lower end surface 2 Support member 3 Spring 4 Sleeve 4a First control surface 4b Second control surface 5 Return spring 6 Annular cutter 6a Annular cutter shoulder (base end)
6b Cutter (Cutter body)
7 locking member 8 center pin 9 inserted portion 9b engaging recess 9c lower surface of the engaging recessed portion (Hikakarigomen)
Side over 9d engaging concave portion (engagement surface)
DESCRIPTION OF SYMBOLS 10 Locking ring 11 Flow path on-off valve body 12 Seal member 31, 34 Tapered part

Claims (2)

In an annular cutter having a cylindrical cutter body having a distal end provided with a cutting blade and a proximal end, and an insertion portion extending coaxially with respect to the cutter body from the proximal end of the cutter body,
The insertion portion is adapted to be inserted into an insertion hole of an arbor for attaching the annular cutter to the punching device, and in the inserted state, the locking portion projects from the radially outer side of the arbor. Having an engagement recess that is engaged by the member, thereby mounting the insert to the arbor,
The engaging recess has an engaging surface above the center of the engaging recess and a non-engaging surface below, and the locking member is inserted into the insertion hole when the insertion member is inserted into the insertion hole. It is possible to engage only with the mating surface, and further, the base end of the cutter body is configured to be able to contact the end surface of the arbor where the insertion hole is provided. An annular cutter. A perforating apparatus having an arbor that has an insertion hole that opens to a free end surface and receives and holds an insertion portion of an annular cutter, the arbor having a storage hole that penetrates a peripheral wall of the insertion hole in the radial direction, and the storage hole A locking member housed in a radially displaceable manner therein, and an operating sleeve mounted on the peripheral wall so as to be movable between a first position and a second position, wherein the operating sleeve is in the first position. A first control surface that is sometimes aligned with the storage hole, and a second control surface that is radially inward of the first control surface that is aligned with the storage hole when in the second position. An operation sleeve having a peripheral surface, a spring for biasing the operation sleeve toward the second position, and the first control surface of the operation sleeve when the insertion portion of the cutter is not inserted into the insertion hole Pressed into the insertion hole by the A support member that engages with the lock member and holds the lock member in a semi-recessed state in the insertion hole, whereas, when inserted into the insertion hole at the tip, A locking member passage surface that can pass through the locking member that is in the semi-entry state; a support member contact portion that contacts the support member and releases the holding of the locking member by the support member; and the locking member passage surface And when the insertion portion is inserted into the insertion hole by a predetermined depth, the locking member is aligned with the locking member, allowing the locking member to be displaced radially inward, Insert having an engaging recess for locking the locking member displaced radially inward by the second control surface, allowing the operating sleeve biased by the spring to be moved to said second position And a plurality of cutting blades are provided A storage hole formed in the arbor when the annular cutter comprising a cylindrical cutter body having an end and a base end is attached to the arbor and pressed against the workpiece to be cut. One end of the inner locking member abuts on the upper engaging surface from the center of the engaging recess, the lower non-engaging surface is brought into the non-engaging state, and the other end of the locking member is on the second control surface of the sleeve The cutting torque is transmitted by abutting, and the cutter body is configured to receive a thrust by abutting the base end against an end surface of the arbor provided with the insertion hole. A device for attaching and detaching an annular cutter.

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