JPH031121Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Technical Field The present invention relates to a tapered surface processing device. Conventional Technology It is easy to machine a tapered surface with any angle of inclination by rotating the workpiece, but it is difficult to machine a tapered surface with a desired angle of inclination by rotating the workpiece. It is not easy to form a tapered surface with an arbitrary inclination angle at the opening of a hole. In such a case, conventionally, a hollow main shaft is rotated by a rotary drive device and fed in the axial direction by a main shaft feeder, and a hollow main shaft is provided with a structure that is rotatable relative to the main shaft and that is rotatable relative to the main shaft. A sliding shaft that is arranged to be relatively movable in the axial direction, a sliding shaft feeding device that sends the sliding shaft in the axial direction, and a traverse slider that is attached to the tip of the main shaft and holds a cutting tool. A cutting tool body that is held slidably in a direction having a component perpendicular to the axis of the main shaft, and a sliding shaft and a traverse slider are provided. A device has been used that includes a motion conversion mechanism that converts the motion into a sliding motion. In this device, if the main shaft is advanced to bring the cutting tool body close to a predetermined position relative to the workpiece, then the sliding shaft is advanced, this forward movement of the sliding shaft is converted by the motion conversion mechanism. This is converted into the sliding motion of the traverse slider, and the cutting tool is moved.
A tapered surface having an inclination angle equal to the inclination angle with respect to the axis of the main shaft of the traverse slider is formed. Problems to be Solved by the Invention However, in the conventional tapered surface machining apparatus of this type, it has not been possible to perform hole machining along with machining the taper surface. A tapered surface is often formed at the opening of a hole, and it is often necessary to form the tapered surface and the hole coaxially with high precision. I couldn't do it. Therefore, the inventors of this invention machined the tapered surface with a cutting tool held on a traverse slider, and also removed a drill, reamer, etc. from the cutting tool body.
The idea was to drill holes by protruding a hole-machining tool such as a boring tool to improve machining efficiency and increase coaxiality between the tapered surface and the hole. However, the taper and diameter of the tapered surface and the diameter of the hole vary depending on the workpiece, and it is normal that one cutting tool cannot machine all of them. If a dedicated tapered surface processing device is provided for each type, equipment costs will inevitably increase. Means for solving the problem The present invention was made with the aim of solving this problem, and its gist is that the main shaft, sliding shaft, traverse slider, cutting tool body, motion conversion mechanism, etc. In the tapered surface machining device, the sliding shaft is hollow, and a hole machining tool is held in the hollow of the sliding shaft so as to be able to protrude outside from the tip of the cutting tool body, and is fed in the axial direction by a holding shaft feeding device. a hollow first transmission member that is fitted in a relatively non-rotatable manner with a holding shaft that is attached to the main shaft, and is slidably fitted in the axial direction in the hollow of the main shaft to transmit the driving force of the sliding shaft feeding device to the sliding shaft; to the sliding shaft by the first coupling device, and a second transmission member fitted in the hollow of the first transmission member so as to be slidable in the axial direction to transmit the driving force of the holding shaft feeding device to the holding shaft. The cutting tool body is detachably connected to the holding shaft by a second connecting device, and the cutting tool body is removable from the main shaft, and the first connecting device is connected to the rear end of the sliding shaft with the front end of the first transmission member. are fitted inside and outside, and a first through hole is formed in the inner part fitted on the inside of both parts to radially penetrate through it, while on the inner circumferential surface of the outer part fitted on the outside. A first recess is formed, and a first ball having a diameter larger than the wall thickness of the inner part is fitted into the first through hole, so that the first ball is present astride the first through hole and the first recess. The second coupling device is provided with a cylindrical portion at one of the rear end of the holding shaft and the front end of the second transmission member, and the second coupling device is provided with a cylindrical portion at one of the rear end of the holding shaft and the front end of the second transmission member. a second through hole is formed in the cylindrical portion thereof, and a second through hole is formed in the outer circumferential surface of the other, and a second through hole is formed in the second through hole. A connecting device that connects the holding shaft and the second transmission member by fitting a second ball having a diameter larger than the thickness so that the second ball straddles the second through hole and the second recess; Furthermore, if the holding shaft or the second transmission shaft between the outer circumferential surface of the holding shaft or the second transmission shaft and the inner circumferential surface of the sliding shaft or the first transmission member exceeds the movement range for hole machining with the hole machining tool. The first ball and the ball are allowed to fit into the portions facing the first through hole and the second through hole, respectively, while being moved to a specific position, and to separate from the first recess and the second recess. The third recess and the fourth recess are formed. Functions and Effects By configuring the tapered surface machining device in this way, the tapered surface can be machined with the cutting tool held by the traverse slider, and the hole machining tool such as a drill, reamer, boring tool, etc. can be removed from the cutting tool body. By making the hole protrude, it is possible to improve machining efficiency and increase the degree of coaxiality between the taper surface and the hole. In addition, the cutting tool body, sliding shaft, motion conversion mechanism,
It has become possible to remove the hole machining tool and the holding shaft as a unit from the main shaft, and it has become possible to machine multiple types of workpieces with one tapered surface machining device. Furthermore, a connecting device using balls is used to connect the sliding shaft and the sliding shaft feeding device, and the holding shaft and the holding shaft feeding device, and provides the necessary feed for hole drilling to the hole drilling tool. By using the operation of the holding shaft and holding shaft feeding device to disconnect the two coupling devices mentioned above, the above unit can be removed with a simple structure, and the entire device can be manufactured compactly and at low cost. It became possible to do so. Embodiments Hereinafter, a case in which the present invention is applied to an apparatus for processing a valve seat in a cylinder head of an engine will be explained in detail based on the drawings. In FIG. 1, reference numeral 10 denotes a hollow main shaft, which is supported by a cylindrical support member 14 fixed on a slide 12 via a plurality of bearings 16 so as to be rotatable and immovable in the axial direction. A pulley 18 is attached to the rear end of the main shaft 10 protruding from the support member 14, and a belt 24 is wound around this pulley 18 and a pulley 22 fixed to the output shaft of the spindle motor 20, so that the motor 20 allows the main shaft 10 to be rotated. In other words, these pulleys 1
8, a spindle motor 20, a pulley 22, a belt 24, etc. constitute a rotational drive device. Further, the slide 12 is placed on a guide stand 28 provided on a base 26 so as to be movable in a direction parallel to the axis of the main shaft 10, and a bracket 30 is provided below the slide 12 so that it cannot rotate but is movable in the axial direction. A numerically controllable electric motor (hereinafter referred to as an NC motor) 3 is attached to the nut 32 that is fixedly attached.
A feed screw 36 rotationally driven by the feed screw 36 is screwed together, and as the slide 12 is moved on the guide table 28 by the rotation of the feed screw 36, the main shaft 10 is fed in the axial direction. ing.
That is, the slide 12, the guide stand 28, the nut 3
2. The electric motor 34, feed screw 36, etc. constitute a main shaft feeding device. Inside the hollow of the main shaft 10, as shown in FIG.
A cylindrical push rod 38 and a clamp shaft 40 are fitted in order from the rear end of the main shaft 10 so as to be non-rotatable but movable in the axial direction. The clamp shaft 40 is powered by a compression coil spring 48 disposed between a spring receiver 44 attached to the rear end with a nut 42 and an inward flange 46 formed on the inner peripheral surface of the main shaft 10. Therefore, the push rod 38 is always biased toward the rear end of the main shaft, and the push rod 38 is disposed at a short distance from the clamp shaft 40. A portion of the clamp shaft 40 on the main shaft distal end side has a large diameter, and this large diameter portion 50 is fitted into a large diameter hole 52 formed at the distal end of the main shaft 10.
A steel ball 56 is movable in the radial direction of the clamp shaft 40 in a plurality of tapered through holes 54 formed at equal angular intervals, but is fitted into the center of the clamp shaft 40 so that it cannot come out. . Additionally, a hollow sliding shaft 58 is provided within the clamp shaft 40.
is fitted to the main shaft 10 so as to be relatively non-rotatable and movable in the axial direction, and this sliding shaft 58 is fitted with a sliding shaft disposed in the push rod 38 so as to be relatively non-rotatable and movable in the axial direction. It is connected to a moving shaft joint 60 so that it rotates and moves integrally. That is, the rear end portion of the sliding shaft 58 has a small diameter, and a plurality of through holes 64 formed at equal angular intervals in this small diameter portion 62 are each provided with a steel ball 66, as shown in FIG. Retaining ring 68
This prevents the sliding shaft 58 from falling off toward the outer periphery of the sliding shaft joint 60, and an annular groove 70 with a triangular cross section is formed in a portion of the inner peripheral surface of the tip end of the sliding shaft joint 60 that corresponds to the through hole 64. steel ball 66
The sliding shaft 58 and the sliding shaft joint 60 are connected by a part of the sliding shaft entering into the annular groove 70, and the engagement between the tip surface of the sliding shaft joint 60 and the stepped surface of the sliding shaft 58 is the steel ball 66 and the annular groove 7.
0, the sliding shaft 58 is moved in the axial direction together with the sliding shaft joint 60. An annular groove 72 with a triangular cross section is formed on the inner circumferential surface of a portion of the sliding shaft 58 that is a short distance away from the portion that holds the steel ball 66 toward the tip of the main shaft. A cup-shaped screw member 74 is fitted into a portion further toward the distal end than the above portion, passing through the sliding shaft 58 in the radial direction. Screw member 74
A ball 76 and a spring 78 are housed inside, and the ball 76 is urged toward the center of the sliding shaft 58 by the spring 78. Further, an annular groove 80 having a triangular cross section is provided on the outer circumferential surface of the main shaft tip end of the sliding shaft 58, and a movable ring 82 extending radially outward and obliquely forward from the sliding shaft 58 is fixed. ing. A cylindrical member 84 as shown in FIG. 1 is screwed into a female screw hole 83 formed at the rear end of the main shaft of the sliding shaft joint 60. Another cylindrical member 86 is fixed to the member 84, and the member 86 is connected to a moving member 90 to which a nut 88 is attached non-rotatably and relatively immovably in the axial direction.
is held rotatably and relatively immovably in the axial direction at the lower end. A feed screw 94 that is rotationally driven by an electric motor 92 placed on the slide 12 is screwed into the nut 88. When the feed screw 94 is rotated, the moving member 90 is moved, and the member 84, 86
The sliding shaft joint 60 and the sliding shaft 58 can be moved in the axial direction via the sliding shaft joint 60 and the sliding shaft 58. In other words, the members 84, 86, nut 88, moving member 90, electric motor 92, feed screw 94, etc. constitute a sliding shaft feeding device. The electric motor 92 is a numerically controllable motor (NC motor) like the NC motor 34, and the numerical control devices of these motors 34, 92 are appropriately controlled to arbitrarily set both motors 34, 92. Therefore, the main shaft 10 and the sliding shaft 58 can be simultaneously moved at any speed and in any direction. As shown in FIG. 2, a cylindrical cutting tool main body 96 is attached to the tip of the main shaft 10 so as to be immovable relative to each other and immovable in the axial direction. This main body 96
is engaged with a key 98 fixed to the tip of the main shaft to prevent relative rotation, while its rear end is fitted into a large diameter portion 50 formed at the tip of the clamp shaft 40, By engaging the steel ball 56 held by the large diameter portion 50 with the inclined surface on the tip side of the main shaft of the annular projection 100 with a trapezoidal cross section formed at the rear end, the main body 96 is attached to the clamp shaft 40.
The main shaft 1 is compressed by the compression coil spring 48 via the
0 and is held relatively immovable in the axial direction. A bottle neck 102 is formed in the axially intermediate portion of the main body 96, and the bottle neck 102 comes into contact with the distal end surface of the main shaft 10, thereby regulating the retraction of the main body 96 into the main shaft 10. Further, the tip end side of the main shaft of the sliding shaft 58 is fitted inside the main body 96 so as to be relatively movable in the axial direction, and the movable ring 82 functions as a key to prevent relative rotation between the two. is being used.
A screw member 104 similar to the screw member 74 is screwed into a portion of the main body 96 facing the sliding shaft 58, and the ball 10 accommodated in the screw member 104
6 is urged toward the sliding shaft 58 by a spring 108. A portion of the cutting tool body 96 projecting from the main shaft 10 has a conical shape, and a traverse slider 112 holding a cutting tool 110 is attached to this portion. The traverse slider 112 is mounted so as to be slidable in a direction inclined at an angle α with respect to the axis of the main shaft 10, and has a through hole 11 formed perpendicular to the longitudinal direction at approximately the middle portion of the traverse slider 112.
4 is slidably fitted with a protruding end of a movable ring 82 fixed to the tip of the sliding shaft 58,
When the sliding shaft 58 is moved, the traverse slider 112 is moved along the sliding surface 116 formed in the main body 96 by the action of the slope formed between the moving ring 82 and the through hole 114. becomes. That is, in this embodiment, the transfer amount is 8
2 functions as a motion conversion mechanism that converts the axial motion of the sliding shaft 58 into the sliding motion of the traverse slider 112, and as mentioned above, the NC motor and the numerical control device of 34 and 92 are used. By controlling the cutting blade 110 properly, the cutting tool 110 can be moved in any direction in a plane including the X-axis and the Y-axis as the traverse slider 112 slides. Further, within the sliding shaft 58, a reamer shaft 118 and a reamer shaft joint 120 are fitted by a key 121 such that they cannot rotate relative to each other and are movable relative to each other in the axial direction. Similar to the sliding shaft 58 and the sliding shaft joint 60, the reamer shaft 118 and the reamer shaft joint 120 have a plurality of steel balls 122 held at the rear end of the reamer shaft 118 at the tip of the reamer shaft joint 120. The sliding shaft 58, the reamer shaft 118, and the cutting tool body 96 are connected to each other by entering annular grooves 124 having a triangular cross section formed on the outer circumferential surface. 58 and sliding shaft joint 60 and reamer shaft 118 and reamer shaft joint 120
By untying the respective connections, it can be removed integrally from the main shaft 10 as shown in FIGS. 9 and 10. The reamer shaft 118 is moved axially by a hydraulic sill 126 shown in FIG. A hydraulic cylinder 126 is mounted on the slide 12, and its piston rod 128 is connected to the member 8.
4, 86 and inserted into the main shaft 10, and is screwed into a female screw hole 130 formed in the reamer shaft joint 120 at its tip.
When the piston rod 128 is expanded and contracted, the reamer shaft 118 is moved in the axial direction, and the reamer (not shown) attached to the reamer shaft 118 is moved by the guide portion 132 formed on the cutting tool body 96. The piston rod 128 is adapted to move while being guided by the reamer shaft 118, so that when the reamer shaft 118 is rotated, the piston rod 128 can rotate together with the reamer shaft 118. Further, the outer peripheral surface of the reamer shaft 118 is provided with a steel ball 12.
An annular groove 134 with a triangular cross section is formed in a portion closer to the rear end of the main shaft than the portion holding the main shaft 2, and an annular groove 136 with a triangular cross section is also formed in a portion closer to the front end of the main shaft. The annular groove 134 is defined by the distance from the portion of the reamer shaft 118 that holds the steel ball 122 to the annular groove 72 formed on the inner peripheral surface of the sliding shaft 58 and the steel ball 66 held by the sliding shaft 58. The annular groove 136 is spaced apart from the steel ball 122 by a distance equal to the annular groove 72 and the threaded member 74.
It is formed at a position equal to the distance between That is, the steel ball 66, annular groove 72, and screw member 74 provided on the sliding shaft 58, and the annular groove 134, steel ball 122, and annular groove 136 provided on the reamer shaft 118.
are formed so as to correspond to each other. When the processing device configured as described above is not in operation, both the sliding shaft 58 and the reamer shaft 118 return to their original positions as shown in FIG. 80 is the cutting tool body 96
The annular groove 136 formed on the outer circumferential surface of the reamer shaft 118 is located a short distance closer to the tip of the main shaft than the threaded member 104 threaded onto the slide shaft 58, and the annular groove 136 is located a certain distance further from the threaded member 74 threaded onto the sliding shaft 58. It is located on the tip side. After the main spindle 10 is advanced by the main spindle feeding device and the cutting tool body 96 is brought close to the cylinder head to a predetermined position, the spindle motor 20 and the NC motor 92 are started, and the main spindle 10 is rotated. After the sliding shaft 58 is advanced and the tapered surface as a valve seat is processed by the cutting tool 110, the reamer shaft 11
8 is advanced to perform finishing machining of the valve stem hole. At this time, by simultaneously moving the main shaft 10 and the sliding shaft 58 at appropriate speeds, a tapered surface with an arbitrary inclination angle can be formed. That is, the main axis 1 of the traverse slider 112
When machining a tapered surface with an angle equal to the inclination angle α with respect to the axis of
0 with its movement stopped, move the sliding shaft 5.
By advancing only the traverse slider 8, the traverse slider 112 is slid in a direction inclined at an angle α with respect to the axis l of the main shaft 10, as shown by the double arrow OA in FIG. A surface is formed. On the other hand, when machining a tapered surface with an inclination angle β larger than α, the cutting tool body 96 is brought closer to the cylinder head, the movement of the main shaft 10 is temporarily stopped, and the sliding shaft 58 is moved forward while simultaneously Main shaft 10
to retreat. As a result, as shown in Figure 4,
If the moving direction of the traverse slider 112 when only the sliding shaft 58 is moved forward is represented by a line segment OA, and the moving direction when only the main shaft 10 is moved backwards is represented by a line segment AB, then the traverse slider 112 is actually a line segment. It is moved in the direction represented by minute OB, and a tapered surface with an inclination angle β larger than α is formed. Furthermore, when machining a tapered surface with an inclination angle γ smaller than α, if the sliding shaft 58 and the main shaft 10 are simultaneously advanced, the traverse slider 112 can be
As shown in FIG. 5, a line segment OA represents the moving direction of the traverse slider 112 when only the sliding shaft 58 is advanced, and a line segment AC represents the moving direction when only the main shaft 10 is advanced. It is moved in the direction OC expressed by the synthesis, and a tapered surface with an inclination angle γ smaller than α is formed. The cases where the inclination angle of the tapered surface is equal to, smaller than, and larger than the inclination angle α of the main shaft 10 of the traverse slider 112 with respect to the axis l have been described above. The amount of movement of 10 and the amount of movement of the sliding shaft 58 are expressed as in the table below, assuming that the amount of movement of the main shaft 10 is 1.
In this table, + means traverse slider 112,
It is assumed that the main shaft 10 and the sliding shaft 58 move forward, and - indicates backward movement.

[Table] Therefore, if the angle of inclination of the valve seat to be formed is different, calculate the amount of movement of the main shaft 10 and sliding shaft 58 by substituting the angle of inclination into the appropriate formula among the above equations. , at the rotational speed calculated from this amount of movement.
By rotating the NC motors 34 and 92,
This makes it possible to form a valve seat with a desired inclination angle. Note that when returning the traverse slider 112 to its original position after processing, the main shaft 10,
It is sufficient to move the sliding shaft 58 by an amount that is the opposite of + and -. In this way, according to this processing device, the NC motor 3
A valve seat with a desired angle of inclination can be formed by rotating the valve seat at an appropriately set rotational speed of 4.92. Compared to the case where a cutting tool body or the like to be held is required, the equipment cost can be significantly reduced, the effort of replacing the traverse slider can be saved, and machining efficiency can be improved. When machining is completed as described above, first, as shown in FIG. 6, the reamer shaft 118 is retreated to the position before machining. In this position, the sliding shaft 58
An annular groove 72 formed on the inner peripheral surface of the reamer shaft 11
The annular groove 134 formed on the outer circumferential surface of the reamer shaft 118 is in a state where they face each other, and if the sliding shaft 58 is retreated from this state to the original position shown in FIG. 7, both the sliding shaft 58 and the reamer shaft 118 are machined. The state returns to the previous original position. When removing the sliding shaft 58, cutting tool body 96, and reamer shaft 118 from the main shaft 10, the sliding shaft 58 is screwed into the annular groove 80 as shown in FIG. 8 from the state shown in FIG. If the reamer shaft 118 is moved until the ball 106 of the member 104 is fitted into the annular groove 136 and the ball 76 of the screw member 74 is fitted into the annular groove 136, as described above, Thread member 74, annular groove 72, steel ball 66, annular groove 136 provided on the reamer shaft 118 side, steel ball 122, annular groove 134
are formed at corresponding intervals, so that at the same time as the ball 76 is fitted into the annular groove 136, the steel balls 66 and 122 are fitted into the annular grooves 134 and 72, respectively, or are opposed to each other. . When the sliding shaft joint 60 and the reamer shaft joint 120 are moved backward from this state, the steel balls 66 and 122 that were facing the annular grooves 134 and 72 are moved to the inner peripheral surface of the sliding shaft joint 60 and the reamer shaft joint 120, respectively. is pushed by the outer circumferential surface of the reamer shaft 1 and fitted into the annular grooves 134 and 72, and the sliding shaft 58 and the sliding shaft joint 60 are connected and the reamer shaft 1
18 and the reamer shaft joint 120 are engaged with and disengaged from each other. Subsequently, the push rod 38 is advanced, and the clamp shaft 40 is advanced against the biasing force of the compression coil spring 48 to disengage the ball 56 from the annular protrusion 100 of the cutting tool body 96, and then the bottle neck 102 is released. When gripped and pulled by an operator by hand or by a robot or the like, the cutting tool main body 96, sliding shaft 58 and reamer shaft 118 are aligned with the ball 106 and the annular groove 80, respectively.
Since they are connected by engagement with the ball 76 and the annular groove 136, they can be removed from the main shaft 10 as a unit. When the cutting tool body 96, sliding shaft 58, and reamer shaft 118 are attached to the main shaft 10, the sliding shaft 58 is inserted into the main shaft 10 from the rear end side. bottleneck 1
02 is engaged with the key 98, and the sliding shaft 58 is inserted into the bottle neck 10 of the cutting tool body 96.
2 is inserted until it contacts the tip surface of the main shaft 10, and then the sliding shaft joint 60 and the reamer shaft joint 120 are moved forward, and the steel balls 66 and 122 are fitted into the annular grooves 70 and 124, respectively, and the sliding Shaft 58, sliding shaft joint 60, reamer shaft 11
8 and the reamer shaft joint 120, and the installation is completed by moving the sliding shaft 58 and the reamer shaft 118 to their original positions shown in FIG. As is clear from the above description, the sliding shaft joint 60 functions as a first transmission member, the reamer functions as a hole drilling tool, the reamer shaft 118 functions as a holding shaft, the reamer shaft joint 120 functions as a second transmission member, and the hydraulic cylinder 126 functions as a holding shaft. Functions as a holding shaft feeding device. Also,
The small diameter part 62 at the rear end of the sliding shaft 58 is fitted into the inner part, and the front end part of the sliding shaft joint 60 is fitted into the outer part.
4 functions as a first through hole, the steel ball 66 functions as a first ball, and the annular groove 70 functions as a first recess, and these constitute a first connecting device. Further, a cylindrical part is formed at the rear end of the reamer shaft 118, and the front end of the reamer shaft joint 120 is fitted inside the cylindrical part, and the through hole formed in the cylindrical part of the reamer shaft 118 is inserted into the cylindrical part. The two through holes, the steel ball 122 function as a second ball, and the annular groove 124 function as a second recess, and these constitute a second coupling device. And the reamer shaft 11
8 and the position of the reamer shaft joint 120 shown in FIG. The groove 72 functions as a fourth recess. Although one embodiment of the present invention has been described above, this is literally an example, and each part can be modified and improved based on the knowledge of those skilled in the art. The invention can be implemented in various ways, such as being applicable not only to devices that form valve seats in engine cylinder heads, but also to devices that process other tapered surfaces.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional front view of the entire tapered surface processing apparatus which is an embodiment of the present invention.
FIG. 2 is a front sectional view showing the tip of the main shaft of the processing device. FIGS. 3 to 5 are diagrams conceptually representing the sliding direction of the traverse slider for each inclination angle of the tapered surface when forming the tapered surface using the processing apparatus described above. FIGS. 6 to 8 are diagrams illustrating the process of removing the cutting tool body, sliding shaft, and reamer shaft from the main shaft. FIG. 9 is a front sectional view showing the cutting tool body, sliding shaft, and reamer shaft removed from the main shaft, and FIG. 10 is a front sectional view showing the main shaft from which these have been removed. FIG. 11 is a front sectional view showing a state in which the sliding shaft and the sliding shaft joint are connected by fitting a steel ball into an annular groove. 10: Main shaft, 18: Pulley, 20: Spindle motor, 22: Pulley, 24: Belt, 32: Nut, 34: Electric motor (NC motor), 36:
Feed screw, 58: sliding shaft, 60: sliding shaft joint, 62: small diameter section, 64: through hole, 66: steel ball,
70, 72: Annular groove, 82: Moving metal, (motion conversion mechanism) 88: Nut, 92: Electric motor (NC motor), 94: Feed screw, 96: Cutting tool body,
110: cutting tool, 112: traverse slider, 118: reamer shaft, 120: reamer shaft joint, 122: steel ball, 124: annular groove, 126:
Hydraulic cylinder, 134: annular groove.

Claims (1)

[Claims for Utility Model Registration] A hollow main shaft that is rotated by a rotary drive device and sent in the axial direction by a main shaft feeder, and a sliding device that is fitted into the hollow of the main shaft so that it cannot rotate relative to the main shaft. A sliding shaft is sent in the axial direction by a shaft feeding device, and a traverse slider attached to the tip of the main shaft and holding a cutting tool is slidably held in a direction having a component perpendicular to the axis of the main shaft. A tapered surface machining device including a cutting tool body and a motion conversion mechanism provided between the sliding shaft and the traverse slider and converting an axial movement of the sliding shaft into a sliding movement of the traverse slider, The sliding shaft is hollow, and a hole machining tool is held in the hollow space of the sliding shaft so that it can protrude outward from the tip of the cutting tool body, and the holding shaft, which is sent in the axial direction by a holding shaft feeding device, is moved relative to the hollow shaft. are non-rotatably fitted,
A first hollow transmission member that is slidably fitted in the hollow of the main shaft in the axial direction and transmits the driving force of the sliding shaft feeding device to the sliding shaft is connected to the sliding shaft by a first coupling device. , and a second transmission member that is slidably fitted in the hollow of the first transmission member in the axial direction and transmits the driving force of the holding shaft feeding device to the holding shaft is connected to the holding shaft by a second coupling device. The cutting tool main body is removable from the main shaft, and the first coupling device is connected to the rear end of the sliding shaft and the front end of the first transmission member inwardly and outwardly. A first through hole is formed in the inner part of the two parts that radially passes through the inner part of the two parts, and a first recess is formed in the inner circumferential surface of the outer part that is fitted to the outside. and a first ball having a diameter larger than the wall thickness of the inner part is fitted into the first through hole, so that the first ball is present astride the first through hole and the first recess. A connecting device that connects a sliding shaft and a first transmission member,
The second coupling device is provided with a cylindrical portion at one of the rear end of the holding shaft and the front end of the second transmission member, the other is fitted into the cylindrical portion, and the second coupling device is fitted into the cylindrical portion in the radial direction. forming a second through hole penetrating through the cylindrical portion, forming a second recess in the other outer peripheral surface, and fitting a second ball having a diameter larger than the wall thickness of the cylindrical portion into the second through hole; A connecting device that connects the holding shaft and the second transmission member by the second ball being present astride the second through hole and the second recess;
Furthermore, the holding shaft and the second transmission shaft are connected to the outer circumferential surface of the holding shaft or the second transmission shaft and the inner circumferential surface of the sliding shaft or the first transmission member. The first ball and the second ball fit into the portions facing the first through hole and the second through hole, respectively, while being moved to a specific position beyond the movement range for the second through hole. A tapered surface machining device characterized in that a third recess and a fourth recess are formed that allow the device to separate from the first recess and the second recess.