Gun Drilling Machine

Abstract

The subject of the present invention is to develop a gun drill machine which can shorten the boundary dimension inevitably generated in the gun drill as much as possible. The present invention is characterized in that: a plurality of vibration-stopping devices (6) for loosely holding the gun drill (5) and suppressing its vibration are arranged in a free zone (Z) between a chip box (3) and a moving spindle unit (2); and each vibration-stopping device (6) is configured to be freely retractable from a stable action position for performing a vibration-stopping action, so as to avoid interfering with the spindle unit (2) moving in the free zone (Z).

Description

Technical Field

[0001] The present invention relates to a gun drill for deep hole processing of a workpiece, and in particular to an improvement of a gun drill that can stabilize the operation of the gun drill and achieve accurate deep hole processing. Background Art

[0002] As is known to all, the operation principle of a gun drill for deep hole processing of a workpiece is to rotate and drive a long gun drill with a special cross-sectional shape, and make the gun drill act in the workpiece to drill a hole; if the hole diameter and processing depth dimensions can be processed by conventional means, the processing technology has been established (for example, refer to Patent Document 1). In addition, deep hole processing often means forming a hole with a ratio of hole size relative to diameter, that is, a hole with an L / D value of 20 to 200 or more.

[0003] On the other hand, when processing requirements are extremely strict, the development of the entire device and the accumulation of a large amount of professional knowledge are required.

[0004] Specifically, an example of the difficult machining requirement specification is that a workpiece is made of a relatively hard stainless steel-based material, and the machining dimensions are a diameter of 1 mm or less and a hole length of more than 200 mm.

[0005] Under such specifications, of course, the gun drill uses a 1mm hole diameter specification, and its total length, including the boundary portion not directly related to the hole, is about 300mm. In addition, the shape of the gun drill is like a quarter of the circumference cut off, not a completely circular cross-section shape. Therefore, it is extremely difficult to make it rotate stably, and it has always been believed that accurate processing cannot be performed.

[0006] That is Fig.12 As shown in (a), even if the machining end side of the gun drill 5' and the workpiece W are accurately controlled by the chip box 3', the gun drill 5' will still rotate at a high speed (for example, a rotation of about 12000 rpm) during the process, and the gun drill 5' will show a skipping phenomenon or ballooning phenomenon, which is bent into a spindle shape. Of course, this movement will also induce the breakage of the gun drill 5'.

[0007] Therefore, it has always been Fig.12 As shown in (b), a vibration-stopping device 6' for stabilizing the gun drill 5' is arranged in the free zone Z between the chip box 3' and the spindle unit 2'. Fig.12 As shown in (c), the vibration-proof bushing 62' only moves in a push-out manner from the base end side in coordination with the movement of the spindle unit 2'. As a result, the position for vibration-proofing the gun drill 5' is not at a uniform position within the free zone Z range.

[0008] That is, in Fig.12In the state shown in (b), even if the distance between the chuck nut 27' and the vibration-damping bushing 62', the distance between the vibration-damping bushings 62', and the distance between the vibration-damping bushing 62' and the gizmo seal 31' are set to the same interval d0, the distance between the nut 27' and the vibration-damping bushing 62' at the most proximal end will gradually shorten as the spindle unit 2' moves, so that the distance becomes different from the interval d0. Specifically, Fig.12 As shown in (c), the interval dx on the base end side becomes shorter than the interval d0.

[0009] Therefore, although the gun drill 5 ′ is held, a complete vibration-stopping effect cannot be expected.

[0010] Due to this situation, the applicant has developed a novel gun drill that can stabilize the operation of the gun drill and achieve accurate deep hole processing by always performing vibration control of the gun drill at an even position within the free zone. This technology has been disclosed in Japanese Patent Publication No. 2018-62035 (Patent Document 1).

[0011] Through this improvement, it has become possible to perform precise deep hole machining stably. However, the inventors did not stop at this technical development. As a result of looking for room for further improvement, they found room for improvement in the problem that the actual length of the gun drill had to be much larger than the effective length. That is, the length of the gun drill had to be the length acting on the workpiece plus the length passing through the chip box and the length used to avoid interference with the vibration-stopping device remaining in the free zone, that is, the so-called dimension after adding the boundary dimension. Of course, this gun drill set to a long size will also lead to an unstable state of action at its front end.

[0012] Prior art literature

[0013] Patent Literature

[0014] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-62035 Summary of the invention

[0015] Problems to be solved by the invention

[0016] The present invention has been completed in consideration of this background, and an object of the present invention is to develop a gun drill that can shorten the margin size that is inevitably generated during gun drilling as much as possible.

[0017] Solutions for solving problems

[0018] That is, the gun drill of scheme 1 comprises a bed, a spindle unit, a chip box, and a workpiece holder; the spindle unit holds the gun drill and moves on the bed from the moving start end to the moving end end; the chip box is arranged on the moving end end side of the spindle unit and supports the gun drill in a freely rotatable manner; the workpiece holder is arranged adjacent to the chip box on the opposite side of the spindle unit; the front end of the gun drill held in the spindle unit is moved from the chip box to the workpiece held in the workpiece holder; and the spindle unit rotates the spindle and the spindle unit rotates the spindle. The axis unit moves, thereby drilling a deep hole in the workpiece; it is characterized in that a plurality of vibration-stopping devices are arranged in the free zone between the chip box and the moving spindle unit to loosen the gun drill and suppress its vibration; and each vibration-stopping device is configured to be freely retracted from a stable action position for performing the vibration-stopping action, so as to avoid interfering with the spindle unit moving in the free zone; and the vibration-stopping device is provided with a finger-like unit for directly loosening the gun drill; the finger-like unit is a switch of a pair of fingers, which performs loosening and releasing of the gun drill; the vibration-stopping device is moved to make the finger-like unit fall down, and reach the stable action position of the gun drill from its retracted position; the vibration-stopping device is provided with an undulating arm and a switch chain supported by it; the undulating arm is freely rotatably arranged on the bed side in the arm pivot at its base end and supports the switch chain freely rotatably on the free end side; the finger-like unit is constituted by fingers arranged on the undulating arm side and fingers on the switch chain side; and the undulating action of the entire vibration-stopping device and the switching of the two fingers constituting the finger-like unit are performed by a displacement device; the switch chain of the vibration-stopping device, in which In the switch chain pivot of the intermediate part, it is freely rotatably arranged in the undulating arm, and a finger is formed on its free end side, and a displacement passive part is formed on its rear end side, and a displacement rod of a displacement cylinder that pulls up the undulating arm in the standing and retreating direction is connected here; the vibration-proof device is constructed by loosening the displacement rod through a gun drill of a finger-shaped unit in the extended position, and by contracting the displacement rod, the switch chain is rotated around the switch chain pivot as the center, so that the finger on the switch chain side retreats to the chin-opening state, and further the undulating arm is rotated and displaced in the standing direction as a whole.

[0019] Furthermore, the gun drill of Scheme 2 is characterized in that, in addition to the requirements described in Scheme 1, the plurality of vibration-damping devices are arranged at fixed positions in the longitudinal direction of the free zone.

[0020] In addition, there is another scheme of the gun drill, characterized in that the vibration-proof device has a sliding unit arranged in the free area, a finger unit arranged at the free end of the sliding unit, and a displacement device for driving the sliding unit; the sliding unit moves in a direction orthogonal to the arrangement direction of the gun drill on the bed and moves the finger unit to a stable working position for loosely holding the gun drill; and the finger unit is constructed to constitute a finger switch and perform loose holding and release of the gun drill.

[0021] Effects of the Invention

[0022] First, according to the invention described in Scheme 1, as the gun drill performs drilling, the spindle unit approaches the chip box side, and the free zone gradually narrows. At this time, the vibration stop device retreats to avoid interfering with the spindle unit, so that the spindle unit can be as close to the chip box side as possible. As a result, the length of the gun drill can be shorter than that of the conventional one, and the drilling action can be stabilized.

[0023] Furthermore, according to the present invention, the gun drill is loosely held by the finger-like unit having a pair of fingers, the vibration-stopping device can be smoothly set and retracted, and a stable vibration-stopping effect can be expected.

[0024] Furthermore, according to the present invention, the vibration-stopping device is a chain-type structure and holds the gun drill in the lying position, so that the space behind the gun drill installation position can be effectively utilized.

[0025] Furthermore, according to the present invention, the fingers provided in the vibration-proof device are respectively provided on the undulating arm that performs the undulating motion and the switch chain provided thereon, and the movement of the finger-like unit during the action and non-action is rationally performed.

[0026] Furthermore, according to the present invention, the vibration-proof device uses a displacement cylinder to perform the switching of the finger-shaped unit and the inversion of the undulating arm, thereby obtaining a simple driving form.

[0027] Furthermore, according to the invention described in claim 2, a plurality of vibration-damping devices are individually fixedly arranged in the long side direction of the free zone, so that a reliable installation method can be obtained.

[0028] Furthermore, according to the gun drill of the above-mentioned other embodiment, the movement of the vibration stop device is a simple sliding action, and the overall structure can be simple. Therefore, even when the gun drill diameter is extremely small, for example, less than 1 mm, and the hole length and free zone are short, a large number of vibration stop devices can be densely arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view showing the gun drill of the present invention, and a side view and a perspective view showing a part of the gun drill enlarged.

[0030] Figure 2 It is a front view showing the same gun drill as above, together with a partially enlarged spindle unit, a chain-type vibration-proof device, a chip box and a workpiece holder.

[0031] Figure 3 It is a plan view showing the gun drill of the present invention.

[0032] Figure 4 It is a side view showing an enlarged view of a chain-type vibration-proof device.

[0033] Figure 5It is an exploded perspective view showing a chain-type vibration-proof device.

[0034] Figure 6 It is a side view showing the movement of the chain type vibration-proof device in stages.

[0035] Figure 7 It is a side view showing a sliding type vibration-proof device.

[0036] Figure 8 It is a plan view showing a sliding type vibration-proof device.

[0037] Fig. 9 It is a perspective view showing a sliding type vibration-proof device.

[0038] Fig.10 It is a side view and a plan view showing another embodiment of the sliding type vibration-proof device.

[0039] Fig.11 This is a side view showing the movement of the spindle unit, the chain-type vibration-proof device, the chip box, and the workpiece holder in stages.

[0040] Fig.12 It is a front view showing a conventional gun drill and a vibration-proof device. DETAILED DESCRIPTION

[0041] The best mode of the present invention is described in the following embodiments, but appropriate changes can be made within the scope of the technical concept of the present invention.

[0042] In the following description, first, the configuration of the gun drill 1 of the present invention is described, and then the operation of the device is described.

[0043] [Example]

[0044] The outline of the gun drill 1 of the present invention is as follows Figure 1 , 2 As shown, it comprises: a bed B, a spindle unit 2 that holds a gun drill 5 and moves on the bed B within a range from a moving start end to a moving end end, a chip box 3 that is arranged at the moving end end of the spindle unit 2 and can freely rotate to support the gun drill 5, a workpiece holder 4 that is arranged adjacent to the chip box 3 on the opposite side of the spindle unit 2, and a vibration-proof device 6 (7) that loosely holds the gun drill 5 between the spindle unit 2 and the chip box 3.

[0045] By means of this gun drill 1, the front end of the gun drill 5 held in the spindle unit 2 is moved from the chip box 3 to the workpiece W held in the workpiece holder 4, and a deep hole H is drilled in the workpiece W by the rotation of the spindle 23 in the spindle unit 2 and the movement of the spindle unit 2.

[0046] Next, in the free zone Z between the chip box 3 and the movable spindle unit 2, a plurality of vibration-absorbing devices 6, 7 are provided with a plurality of seats in the axial direction of the gun drill 5, and each vibration-absorbing device 6, 7 is constructed to be able to withdraw from the position by loosely holding the gun drill 5 in order to avoid interfering with the spindle unit 2.

[0047] Hereinafter, each element constituting the gun drill 1 will be described in detail.

[0048] First, the spindle unit 2, as an example, adopts the same structure as that disclosed in the Japanese patent application No. 2012-86312 "Gun Drill" of the applicant. Figure 2 As shown, a stator 21 and a rotor 22 are provided in a housing 20 , and a main shaft 23 of the rotor 22 is axially supported by a pair of bearings 24 provided opposite to each other at both ends of the housing 20 .

[0049] Next, an oil hole 25 is formed through the axial center of the main shaft 23 , and an oil supply pipe 26 is connected to one end of the main shaft 23 , and a nut 27 for a chuck of the gun drill 5 is connected to the other end.

[0050] The spindle unit 2 having such a configuration is configured to be movable along the axial direction of the spindle 23 on a rail R2 provided on the bed B by a ball screw mechanism or the like (not shown).

[0051] Next, the chip box 3 is a device for rotatably supporting the front end side of the gun drill 5 and collecting chips generated by the workpiece W. It is also a device for holding the workpiece W and is fixedly installed between the spindle unit 2 and the workpiece holder 4 on the bed B.

[0052] Specifically, Figure 2 As shown, a chuck 35 is rotatably provided on one side of a housing 30, and a protective seal 31 is rotatably provided on the opposite side of the chuck 35. A gun drill 5 is inserted through a drill hole 31a in the protective seal 31 and a drill hole 32a in a drill bushing 32, and the front end of the gun drill 5 protruding from the drill hole 32a acts on a workpiece W in contact with the drill bushing 32.

[0053] In addition, a support bushing having a drill hole formed therein may be provided between the protection seal 31 and the drill bushing 32 to more reliably hold the gun drill 5 .

[0054] Next, the workpiece holder 4 is a device for holding the workpiece W processed by the gun drill 1 between the chip box 3 and the workpiece holder 4 , and further has a structure for rotating the workpiece W in the opposite direction to the rotation direction of the gun drill 5 in this embodiment.

[0055] Specifically, Figure 2As shown, a chuck 42 is provided on the output shaft of a relative rotation unit 41 formed by combining appropriate gears, and a motor M4 for driving the relative rotation unit 41 is provided.

[0056] Moreover, this workpiece holder 4 is configured such that the chuck 42 is opposite to the chuck 35 in the chip box 3, and is further constructed to be able to adjust the distance between the chuck 42 and the chuck 35 by moving along the axial direction of the spindle 23 in the spindle unit 2 on the track R4 laid on the bed B, so that workpieces W of various lengths can be held.

[0057] In addition, the workpiece holder 4 may be in the form of a table that does not rotate the workpiece W but is in a fixed state.

[0058] Next, the gun drill 5 is a drill bit used for deep hole processing (L / D value 20 to 200), especially as an example of difficult processing requirements, assuming feasible processing conditions: the workpiece W is a harder stainless steel or titanium material, the size of the deep hole H is a diameter of less than 1 mm and a hole length of more than 200 mm.

[0059] In the case of such specifications, the total length of the gun drill 5, including the boundary portion not directly related to the drilling, is about 300 mm. However, according to the present invention, the boundary portion can be made about half as long, and the total length can be, for example, about 250 mm.

[0060] And the cross-sectional shape of the gun drill 5 is as follows Figure 2 The enlarged view in the figure shows that the V-groove 51 is formed by cutting off almost 1 / 4 of the circumference from the circular shape, and is not a completely circular cross-sectional shape. In addition, the gun drill 5 is penetrated in the axial direction to form one or more oil holes 52.

[0061] in addition, Figure 2 Although the axial centers of the oil hole 25 in the spindle 23 and the oil hole 52 in the gun drill 5 are offset, there is a nut 27 for the chuck between the two. Therefore, by providing a cutting oil storage area in the nut 27, the cutting oil can be smoothly moved from the oil hole 25 to the oil hole 52.

[0062] Next, the vibration-damping devices 6 and 7 of the main subject structure of the present invention are described. The vibration-damping devices 6 and 7 are devices for suppressing the state of the gun drill 5 bending into a spindle-like skipping rope phenomenon or balloon phenomenon caused by high-speed rotation of the gun drill 5 at, for example, about 12,000 rpm.

[0063] The vibration-stopping devices 6 and 7 of the present invention are configured to be retracted from the stable action position of loosely holding the gun drill 5 to avoid interfering with the spindle unit, and are configured in two forms. One is a chain-type vibration-stopping device 6 whose movable form is a combination of chains, and the other is a sliding-type vibration-stopping device 7 whose movable form is, for example, horizontal movement.

[0064] 《Chain type vibration arrester》

[0065] First, regarding the chain type vibration-proof device 6, refer to Figures 1 to 6 11 is a diagram to explain its structure. The vibration-proof device 6 is arranged in the back space of the actual processing space of the spindle unit 2 or the gun drill 5 in the gun drill machine 1, and a plurality of support columns 60 as frame components are arranged side by side along the free zone Z. The support column 60, first, has its upper portion as a cylinder support 60A and a portion extending from the vicinity of the middle height to the front side as an arm support 60B. For this support column 60, first, an undulating arm 61 is freely rotatably provided. That is, as an example of the undulating arm 61, a long plate-shaped member is used, and its base is used as an arm pivot 61P, and this is pin-connected to the arm support 60B in the support column 60.

[0066] As a result, the lifting arm 61 is constructed so as to be able to receive the action of the displacement cylinder 66 described later with the lower end as the center, and to rotate from a nearly horizontal stable action position to a retreat position in which the free end stands upward.

[0067] Furthermore, the lifting arm 61 is provided with a finger 61F on one side of a finger-like unit 65 for loosely holding the gun drill 5 at its free end. A vibration-proof guide 62 is fixed to the finger 61F on the lifting arm 61 side, and the material thereof is suitable for not hindering the smooth rotation of the gun drill 5; and a guide groove 62A serving as a receiving portion for the gun drill is formed in the vibration-proof guide 62. In addition, reference numeral 61S is an arm setting spring extending between the arm support member 60B and the lower side of the lifting arm 61, which maintains the posture of the lifting arm 61 at the retreated position and slightly applies force to make the lifting arm 61 fall down after it starts to fall down.

[0068] To this type of undulating arm 61, a switch chain 63 including a finger 63F on the other side of the finger-like unit 65 is rotatably mounted. That is, the switch chain 63 is a plate-like chain member that can be roughly compared to a deformed trident, and a switch chain pivot 63P is formed at a position protruding upward in the middle of the figure, and the undulating arm 61 is rotatably pinned at this position near its free end and behind the finger 61F. The switch chain 63 has a finger 63F on the switch chain side at its free end side, and a vibration-proof guide 64 having a guide groove 64A formed thereon similarly to the finger 61F on the undulating arm side is fixed to this position. Such a pair of fingers 61F and 63F constitute the finger-like unit 65 as a pair.

[0069] Furthermore, the rear protruding portion of the switch chain 63 is a displacement passive portion 63D, to which a displacement rod 67 of a displacement cylinder 66 described later is pinned. In addition, reference numeral 63S is a chain setting spring for urging the finger 63F on the switch chain 63 side to always be in an open state.

[0070] Next, the displacement cylinder 66 for lowering and lifting the lifting arm 61 including the switch chain 63 is described. In this embodiment, the displacement cylinder 66 is set to face the displacement rod 67 downward and slightly tilted backward from the upright state. First, the upper end of the cylinder support 60A of the support column 60 is pinned to the upper cylinder pivot 66P. On the other hand, the displacement rod 67 facing downward has its rod tail end 67E pinned to the displacement passive part 63D of the switch chain 63 at the rod pivot 67P.

[0071] As an example of the displacement cylinder 66, a pneumatic cylinder is ideal from the viewpoint of control and maintenance, but a hydraulic cylinder, a motor cylinder, etc. may also be used. Of course, other torque actuators may be applied as long as the required actions such as the rotation of the lifting arm 61 and the rotation of the switch chain 63 can be achieved.

[0072] Here, regarding the chain type vibration-proof device 6, refer to Figure 6 Describe its operating status.

[0073] i) Initial state of the vibration-proof device

[0074] The starting state is Figure 6 As shown in (a), the state in which the finger unit 65 loosely holds the gun drill 5 in a stable state is taken as the initial state. In this state, the displacement rod 67 of the displacement cylinder 66 is fully extended, the lifting arm 61 is in a state of almost horizontal prostration, and the fingers 61F and 63F of the finger unit 65 are in a closed state. Figure 5 The presence of the guide grooves 62A and 64A shown ensures the guide hole of the gun drill 5 and loosely holds the gun drill 5. Figure 3 From the plan view of this state, it is obvious that the vibration-proof device 6 is in the position of interfering with the spindle unit 2, so in order to avoid interference, it then moves away from this position.

[0075] ii) Retraction action of the vibration-proof device

[0076] The retraction action of the vibration-proof device 6 is performed by using the displacement cylinder 66 as an actuator, so that the displacement rod 67 in the displacement cylinder 66 changes from an extended state to a contracted state.

[0077] ii-1) Opening of switch chain

[0078] At this time, since the displacement rod 67 is not directly connected to the lifting arm 61 but is connected to the displacement passive part 63D of the switch chain 63, the contraction of the displacement rod 67 first causes the switch chain 63 to rotate its finger 63F obliquely downward around the switch chain pivot 63P. That is, the finger 63F moves as if the chin is opened relative to the finger 61F on the lifting arm 61 side. Figure 6 As shown in (b), first, the holding of the lower side of the gun drill 5 is released.

[0079] ii-2) Lifting of the lifting arm

[0080] Then, if Figure 6 As shown in (c), if the displacement rod 67 is further retracted, the switch chain 63 pulls up the displacement passive part 63D, and the movement is actually transmitted to the undulating arm 61 through the switch chain pivot 63P, so as to lift the free end side of the undulating arm 61. As a result, the undulating arm 61 lifts its free end side around the arm pivot 61P, and finally Figure 6 As shown in (d), when the displacement rod 67 of the displacement cylinder 66 is fully retracted, the lifting arm 61 is in an almost upright state, and in this state, the lifting arm 61 is maintained in the upright state.

[0081] In addition, when the undulating arm 61 gradually stands up, the switch chain side finger unit 63F below the finger unit 65, such as Figure 4 As shown by the imaginary line (single-dot chain line) in FIG. 1 , the chin gradually moves diagonally upward when the chin is opened, but retreats to the rear compared to the configuration position of the gun drill 5, which has fully avoided interference with the gun drill 5.

[0082] iii) Re-maintenance of the vibration-proof device

[0083] When the gun drill 5 is loosened again from the retracted state of the vibration-stopping device 6, the displacement rod 67 of the displacement cylinder 66 is gradually extended in the opposite manner to the previous retracting operation. Figure 6 As shown in (b), the lifting arm 61 is first tilted to a horizontal position, and the finger 61F at the front end thereof holds the gun drill 5 from above. Then, the displacement rod 67 continues to extend, and the switch chain 63 rotates clockwise in the figure with the switch chain pivot 63P as the center, as shown in FIG. Figure 6 As shown in (a), the finger 63F is displaced to the so-called chin-closed state, and the gun drill 5 is loosely held by it and the finger 61F.

[0084] 《Sliding type vibration damping device》

[0085] Next, another type of sliding type vibration-proof device 7 is described, and then the overall operation of the gun drill 1 is described. The sliding type vibration-proof device 7 has two embodiments, one of which is Figure 7 , 8 , 9, the displacement and sliding displacement of the finger unit 75 are performed by separate actuators. Fig.10 The single-cylinder type shown uses only one sliding displacement cylinder 78 as an actuator to perform sliding displacement and switching of the finger unit.

[0086] 〈Multiple cylinder type〉

[0087] First, an embodiment in which the displacement and sliding displacement of the finger unit are performed by separate actuators is described. Figure 7 , 8 As shown in FIG. 9 , a guide rail 70 is disposed on the bed B at right angles to the direction in which the gun drill 5 is disposed, and a slide unit 71 is provided on the guide rail 70 so as to be slidable.

[0088] The sliding unit 71 has a linear guide 72G directly engaged with the guide rail 70 below a slider 72 which is a part of the sliding unit 71, and a finger support 73 in front of the linear guide 72G. In addition, a sliding displacement cylinder 78 as a displacement device described later is provided behind the sliding unit 71 to perform sliding displacement of the sliding unit 71.

[0089] The finger support 73 as the front member of the slide unit 71 is a member extending forward in a floating manner as seen from the guide rail 70 , and has a finger unit 75 composed of a pair of upper and lower fingers 75A and 75B at its front end via a switch guide 74 .

[0090] That is, the pair of fingers 75A, 75B are as follows: Figure 7 , 8 As shown, each of the upper and lower fingers 75A and 75B moves relatively up and down, approaches and separates. This linear movement in the up and down direction is obtained by the switch guide 74, and adopts a meshing or dovetail groove-shaped guiding means. Moreover, each of the upper and lower fingers 75A and 75B has a vibration-proof guide 75G at its front end, similar to the chain-type vibration-proof device 6. Furthermore, this pair of upper and lower fingers 75A and 75B is relatively displaced up and down, and a finger displacer 76 as its driving component is provided at the rear.

[0091] The finger displacer 76 includes two finger displacers arranged side by side: an upper finger displacer 76A for displacing the upper finger 75A, and a lower finger displacer 76B for displacing the lower finger 75B.

[0092] Next, the displacement device for slidingly displacing the sliding unit 71 as a whole will be described. A cylinder support 77 is provided at the rear end of the bed B, and a sliding displacement cylinder 78 as the displacement device is installed thereon.

[0093] The sliding displacement cylinder 78 is also similar to the displacement cylinder 66 described above. It is preferably a pneumatic cylinder, but other hydraulic cylinders and motor cylinders may also be used. Furthermore, the displacement device may not be a cylinder type, but may be driven to move the sliding unit 71 forward and backward through a gear rack mechanism or the like. The displacement rod 79 is connected at its front end to the slider 72 of the sliding unit 71, and the sliding unit 71 is driven to slide forward and backward by its extension and contraction.

[0094] The operation state of the sliding type vibration-proof device 7 having the above-mentioned structure will be described.

[0095] i) Starting state

[0096] The initial state is described with the stable state of the vibration-proof device 7 as the initial state. In this initial state, the sliding unit 71 receives the extension of the displacement rod 79 and is in the position of extending to the front. And the finger-like unit 75 at the front end is that the upper and lower fingers 75A and 75B of the finger-like unit 75 are close to each other and loosely hold the gun drill 5, so as to achieve its vibration-proof effect.

[0097] ii) Retraction action of the vibration-proof device

[0098] On the other hand, when the vibration-proof device 7 is retreated, the upper finger displacer 76A and the lower finger displacer 76B of the finger displacer 76 are first operated to relatively move the upper and lower fingers 75A and 75B in the upper and lower directions. The gun drill 5 held by the finger unit 75 is thereby released.

[0099] In this state, when the displacement rod 79 of the slide displacement cylinder 78 is retracted, the slide unit 71 connected thereto moves backward with the finger unit 75 .

[0100] iii) Return action (loose holding of the gun drill)

[0101] This action is performed in the reverse order of the retreating action. First, the slide unit 71 is moved by the slide displacement cylinder 78 , and then the finger unit 75 operates to loosen the gun drill 5 .

[0102] 〈Single cylinder type〉

[0103] Next, a single-cylinder type embodiment in which the sliding displacement of the sliding unit 71 and the displacement of the finger unit 75 are performed by only one sliding displacement cylinder 78 will be described.

[0104] The single cylinder type vibration-proof device 7, as Fig.10 The side view (a) and the plan view (b) are shown. In addition, the same reference numerals are given to the common parts compared with the previous double cylinder type vibration-proof device 7. The sliding unit 71 is almost the same, and slides on the guide rail 70 provided on the bed B in the direction perpendicular to the extension direction of the gun drill 5. In addition, a finger support 73 is provided at the front end of the sliding unit 71, and the upper and lower fingers 75A and 75B are supported thereon, and the finger unit 75 is freely rotatably installed so that it can perform a scissor-like action in a state where it is always open.

[0105] That is, each of the upper and lower integrated fingers 75A and 75B is supported by the finger pivot 75P so as to be freely rotatable, and is given a tendency to always be opened by the setting spring 75S. Further, the rear end thereof is connected to the finger displacer 76 as a displacement receiving pivot 75d.

[0106] In addition, the finger displacer 76 is composed of a displacement rod 79 that is freely rotatably connected to a sliding displacement cylinder 78 supported on the side of bed B and is combined into chain plates 76C and 76D that are V-shaped when viewed from the side. The gathering part of each chain plate 76C and 76D is connected to the displacement rod 79 as a displacement pivot pin 76P.

[0107] As can be understood from this structure, this embodiment uses a sliding displacement cylinder 78 to approach and separate the vibration-stopping device 7 from the gun drill 5 side, and to loosen and release the gun drill 5 through the finger unit 75. The following describes its operation.

[0108] i) Starting state

[0109] The initial state is described with the stable state of the vibration-proof device 7 as the initial state. The slide unit 71 receives the extension of the displacement rod 79 and is in the position of extending to the front. And the finger-like unit 75 at the front end is that the upper and lower fingers 75A and 75B approach each other and loosely hold the gun drill 5, achieving its vibration-proof effect. At this time, the upper and lower fingers 75A and 75B resist the setting spring 75S to present a loose holding state.

[0110] ii) Retraction action of the vibration-proof device

[0111] In this operation, first, the displacement rod 79 of the slide displacement cylinder 78 is retracted. After receiving this operation, the upper and lower fingers 75A and 75B, which are always in the open tendency, open their front end sides according to the elastic force of the setting spring 75S. And if the displacement rod 79 is further retracted, the slide unit 71 retreats as if being pulled away by it.

[0112] iii) Return action (loose holding of the gun drill)

[0113] This action is performed in the opposite direction to the retreating action of the vibration-proof device 7. The slide unit 71 advances first by the extension of the displacement rod 79. At this time, the upper and lower fingers 75A and 75B of the finger-shaped unit 75 are in an open state by the setting spring 75S.

[0114] Then, after the slide unit 71 is pushed out to the front end, it stops there, and then the finger shifter 76 that receives the further movement of the displacement rod 79 is pressed by the displacement pivot 76P, so that the displacement receiving pivot 75d side is opened against the setting spring 75S. That is, the upper and lower fingers 75A and 75B are rotated on the finger pivot 75P to close the individual fingers 75A and 75B, and the gun drill 5 is loosely held, and its initial state is obtained.

[0115] The above has described the respective structures and functions of the chain type and the slide type, and the gun drill 1 of the present invention is as follows: Figure 1 As shown, a control panel 8 for controlling the spindle unit 2, the workpiece holder 4, the vibration-absorbing devices 6, 7, etc. may be provided.

[0116] An example of the gun drill 1 of the present invention is constructed as described above. The following is a description of the overall operation of the device. Fig.11 Provide explanation.

[0117] i) Preparation

[0118] The preparation work mainly includes setting the workpiece W and installing the gun drill 5 .

[0119] First, regarding the workpiece W Fig.11 As shown in (a), the position of the workpiece holder 4 is set to an appropriate position according to the length of the workpiece W, and then Fig.11 As shown in (b), both ends of the workpiece W are held by the chuck 42 of the workpiece holder 4 and the chuck 35 on the chip box 3 side.

[0120] On the other hand, during the installation of the gun drill 5, since the vibration-stopping devices 6 and 7 of the present invention can be freely retracted from the stable action position, the plurality of vibration-stopping devices 6 and 7 are first all placed in the retracted state as described above.

[0121] In this state, the base of the driving side of the gun drill 5 is fixed by the chuck nut 27 on the spindle 23 side, and the front end is inserted into the chip box 3 and held by the drill bushing 32 .

[0122] In addition, in this operation, since the vibration stoppers 6 and 7 can be all retracted first, the setting operation of the gun drill 5 can be easily performed.

[0123] ii) Setting of vibration-proof device

[0124] After the gun drill 5 is installed, the vibration-proof devices 6 and 7 are operated as described to move the entire seat into a stabilizing device, and the gun drill 5 is loosely held by the finger units 65 and 75.

[0125] In addition, at this time, depending on the length of the workpiece W, the vibration-absorbing devices 6 and 7 near a portion of the spindle unit 2 may not function.

[0126] iii) Through the drilling of the gun and the withdrawal of the vibration stop device

[0127] Then, after the gun drill 5 is driven, its front end acts on the workpiece W to start the drilling action. In addition, in addition to fixing the workpiece W to the workpiece holder 4 of the machine structure, for example, and rotating and driving the gun drill 5, the drilling step can also be performed by rotating the workpiece W in the opposite direction to the gun drill 5.

[0128] And as the perforation proceeds, Fig.11 As shown, the spindle unit 2 gradually moves toward the workpiece W, and the vibration-stopping devices 6 and 7 near the spindle unit 2 are sequentially withdrawn from the stable action position. As a result, the spindle unit 2 avoids interfering contact with the vibration-stopping devices 6 and 7, and the remaining vibration-stopping devices 6 and 7 are retained in the free zone Z to support the smooth rotation of the gun drill 5.

[0129] Then, when the drilling operation is nearly finished, the last remaining vibration-stopping devices 6 and 7 close to the chip box 3 are also withdrawn, so that the spindle unit 2 is moved to the closest position to the chip box 3.

[0130] It is obvious from this operation mode that the overall length of the gun drill 5 can be reduced to almost half of the conventional required margin size, thus bringing about stable operation.

[0131] Description of reference numerals:

[0132] 1: Gun Drill

[0133] 2: Spindle unit

[0134] 20: Shell

[0135] 21: Stator

[0136] 22: Rotor

[0137] 23: Spindle

[0138] 24: Bearings

[0139] 25: Oil hole

[0140] 26: Oil supply pipe

[0141] 27: Nut (for chuck)

[0142] 3: Chip box

[0143] 30: Shell

[0144] 31: Protective seal

[0145] 31a: Drill hole

[0146] 32: Drill Bushing

[0147] 32a: Drill hole

[0148] 35: Chuck

[0149] 4: Workpiece holder

[0150] 41: Relative rotation unit

[0151] 42: Chuck

[0152] 5: Gun Drill

[0153] 51: V groove

[0154] 52: Oil hole

[0155] 6: Vibration stop device (chain type)

[0156] 60: Support column

[0157] 60A: Cylinder support

[0158] 60B: Arm support

[0159] 61: Heaving Arm

[0160] 61P: Arm pivot

[0161] 61S: Arm setting spring

[0162] 61F: (undulating side) fingers

[0163] 62: Anti-vibration guide

[0164] 62A: Guide groove

[0165] 63: Switch Chain

[0166] 63F: (Switch side) Finger

[0167] 63P: Switch chain pivot

[0168] 63D: displacement passive part

[0169] 63S: Chain setting spring

[0170] 64: Anti-vibration guide

[0171] 64A: Guide groove

[0172] 65: Finger unit

[0173] 66: Displacement Cylinder

[0174] 66P: Cylinder pivot

[0175] 67: Displacement rod

[0176] 67E: Rod end

[0177] 67P: Rod pivot

[0178] 7: Vibration stop device (sliding type)

[0179] 70: Guide track

[0180] 71: Sliding unit

[0181] 72: Slider

[0182] 72G: Linear guide

[0183] 73: Finger support

[0184] 74: Switch guide

[0185] 75: Finger unit

[0186] 75A: (upper) fingers

[0187] 75B: (lower) fingers

[0188] 75d: displacement receiving pivot

[0189] 75G: Anti-vibration guide

[0190] 75P: Finger Pivot

[0191] 75S: Setting spring

[0192] 76: Finger Displacer

[0193] 76A: Upper Finger Displacer

[0194] 76B: Lower finger shifter

[0195] 76C: Chain

[0196] 76D: Chain

[0197] 76P: Displacement Pivot

[0198] 77: Cylinder support

[0199] 78: Sliding displacement cylinder (as displacement device)

[0200] 79: Displacement rod

[0201] 8: Control panel

[0202] d0: interval

[0203] dx: interval

[0204] B: Bed

[0205] H: Deep hole

[0206] M4: Motor

[0207] R2: Track

[0208] R4: Track

[0209] W: Workpiece

[0210] Z: Free zone.

Claims

1. A gun drill having a bed, a spindle unit, a chip box, and a workpiece holder; The spindle unit holds the gun drill and moves on the bed from a moving start end to a moving end end; The chip box is arranged on the mobile terminal side of the spindle unit and can freely rotate to support the gun drill; The workpiece holder is arranged adjacent to the chip box on the opposite side to the spindle unit; moving the front end of the gun drill held in the spindle unit from the chip box to the workpiece held in the workpiece holder; A deep hole is punched into a workpiece by rotating the spindle of the spindle unit and moving the spindle unit; the feature is that: In the free area between the chip box and the moving spindle unit, a plurality of vibration-stopping devices are provided to loosely hold the gun drill and suppress its vibration; and Each vibration-stopping device is configured to be able to freely retreat from a stable position for performing a vibration-stopping action, so as to avoid interfering with the main shaft unit moving in the free zone; and The vibration-proof device has a finger-shaped unit for directly loosening and holding the gun drill; the finger-shaped unit is a switch for loosening and releasing the gun drill through a pair of fingers; The vibration-stopping device is moved to cause the finger-like unit to fall down and reach the stable action position of the gun drill from its retreated position; The vibration-proof device comprises an undulating arm and a switch chain supported by the undulating arm; the undulating arm is rotatably arranged on the bed side in an arm pivot at its base end and rotatably supports the switch chain at the free end side; The finger unit is formed by the fingers arranged on the undulating arm side and the fingers on the switch chain side; and the undulating action of the entire vibration-proof device and the switching of the two fingers constituting the finger unit are performed through the displacement device; The switch chain of the vibration-proof device is freely rotatably arranged on the undulating arm in the switch chain pivot in the middle part, and forms fingers on the free end side, forms a displacement passive part on the rear end side, and is connected to the displacement rod of the displacement cylinder that pulls up the undulating arm in the standing and retreating direction; the vibration-proof device is constructed such that the displacement rod is loosely held by the gun drill of the finger-shaped unit in the extended position, and the switch chain is rotated around the switch chain pivot as the center through the contraction of the displacement rod, so that the fingers on the switch chain side retreat to the chin-opening state, and the undulating arm is further rotated and displaced as a whole in the standing direction.

2. The gun drill according to claim 1, wherein: The plurality of vibration-proof devices are arranged at fixed positions in the long-side direction of the free zone.

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