WO2015155827A1 - コレットチャック、チャック装置、及び、加工製品の製造方法 - Google Patents

コレットチャック、チャック装置、及び、加工製品の製造方法 Download PDF

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Publication number
WO2015155827A1
WO2015155827A1 PCT/JP2014/060139 JP2014060139W WO2015155827A1 WO 2015155827 A1 WO2015155827 A1 WO 2015155827A1 JP 2014060139 W JP2014060139 W JP 2014060139W WO 2015155827 A1 WO2015155827 A1 WO 2015155827A1
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WO
WIPO (PCT)
Prior art keywords
collet
axial direction
main
sub
workpiece
Prior art date
Application number
PCT/JP2014/060139
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
夢周 金
裕司 小口
Original Assignee
株式会社ダイヤ精機製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ダイヤ精機製作所 filed Critical 株式会社ダイヤ精機製作所
Priority to JP2016512505A priority Critical patent/JP6208851B2/ja
Priority to PCT/JP2014/060139 priority patent/WO2015155827A1/ja
Priority to KR1020167020689A priority patent/KR101801502B1/ko
Priority to TW104101297A priority patent/TWI574773B/zh
Publication of WO2015155827A1 publication Critical patent/WO2015155827A1/ja

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/201—Characterized by features relating primarily to remote control of the gripping means
    • B23B31/207—Characterized by features relating primarily to remote control of the gripping means using mechanical transmission through the spindle
    • B23B31/2072—Axially moving cam, fixed jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/20—Collet chucks
    • B23B2231/201—Operating surfaces of collets, i.e. the surface of the collet acted on by the operating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/20—Collet chucks
    • B23B2231/2072—Jaws of collets

Definitions

  • the present invention relates to a collet chuck, a chuck device, and a method of manufacturing a processed product, and more particularly to a fixing structure at the time of processing a part suitable for improving the processing accuracy in the axial direction of a processed part.
  • chuck devices for gripping materials and tools.
  • a collet chuck that has a slit and can be expanded and contracted in the radial direction is used.
  • the collet chuck is provided with a pressure surface to be tapered or inversely tapered, and the collet chuck opens and closes by driving an action member such as a sleeve or a drawbar having a pressure surface corresponding to the pressure surface in the axial direction. Operates and grips parts, tools, and the like by the gripping portion.
  • Such a chuck device is particularly suitable for performing various types of front surface processing while holding the work material on the main shaft, and then performing the back surface processing by transferring the front end of the semi-processed product after the front surface processing to the rear surface main shaft. This is an extremely important part for ensuring the shape accuracy of the processed parts.
  • JP 2007-152509 A Japanese Utility Model Publication No. 51-39899 Japanese Utility Model Publication No.57-7448
  • the semi-processed product when the outer surface of the semi-processed product has a reverse taper shape that is inclined obliquely toward the base end side in the axial direction, the semi-processed product easily escapes to the front end side of the chuck device when processing the back surface. It becomes easy to do.
  • the present invention solves the above-mentioned problems, and the problem is that the shape accuracy of the processed part can be improved and the defect rate can be reduced by preventing the gripping position from shifting in the axial direction. It is to realize a collet chuck, a chuck device, and a manufacturing method of a processed product.
  • the collet chuck of the present invention includes a cylindrical main collet, and a cylindrical sub-collet that is arranged to be movable in the axial direction relative to the main collet on the inner peripheral side of the main collet.
  • the main collet is a plurality of slits extending in the axial direction and a surface provided on the outer periphery and pressed to expand and contract the inner diameter of the main collet, on either side of the axial direction
  • a pressurized surface configured in a tapered or reverse tapered direction
  • a main-side inclined surface configured in a reverse tapered shape provided on the inner periphery and inclined obliquely toward the distal end side in the axial direction
  • the sub-collet is configured in a plurality of slits extending in the axial direction, a gripping surface provided on the inner periphery for gripping a gripped material, and an inversely tapered shape provided on the outer periphery and in contact with the main inclined surface A secondary inclined surface.
  • this collet chuck is an outer diameter gripping type collet chuck that grips the outer diameter of the material to be gripped.
  • the inner diameter of the main collet expands and contracts depending on whether pressure is applied to the surface to be pressed, whereby the main-side inclined surface of the main collet drives the auxiliary-side inclined surface of the sub-collet in contact with the main collet. Since the inner diameter of the sub collet expands and contracts, the material to be gripped can be gripped from the outside by the gripping surface provided on the inner periphery of the sub collet. In this gripping state, if a force is applied to the gripped material in the axial direction from the distal end side, the secondary collet that grips the gripped material tends to move toward the base end side in the axial direction with respect to the main collet.
  • the secondary collet since the secondary collet is in contact with the main inclined surface, the internal diameter of the secondary collet is reduced and the gripping force of the secondary collet on the gripped material is increased. Misalignment is less likely to occur. In addition, the occurrence of damage to the surface portion of the gripping material in contact with the gripping surface is suppressed by reducing the displacement of the gripping material.
  • the secondary collet is biased by the axial spring toward the tip in the axial direction, making it easier for the secondary collet to release the gripped material, and the secondary collet compressing the axial spring by inserting the gripped material Even when the gripping material is gripped while being pushed to the base end side of the main collet, it is easy to return to the original position when the gripping material is released.
  • the sub collet has a positioning locking portion that locks and positions the gripped material from the base end side in the axial direction when in the released state. According to this, the position accuracy of the auxiliary collet and the material to be grasped in the axial direction can be ensured by grasping the material to be grasped in contact with the positioning locking portion.
  • the positioning locking portion may be provided on a part of the gripping surface (for example, the base end in the axial direction of the gripping surface), and is separated from the gripping surface (for example, on the base end side in the axial direction). It may be provided at a position.
  • the gripping surface of the sub-collet may have an engaging gripping portion that protrudes in the radial direction to enable jumping and gripping.
  • the positioning locking portion is provided apart from the proximal end side in the axial direction of the engagement gripping portion.
  • the gripping surface of the sub-collet is a frustum-shaped surface that is inclined obliquely toward the tip end side in the axial direction. That is, it is preferable that the gripping surface is configured in a reverse taper shape that is inclined obliquely toward the tip end side in the axial direction if the collet chuck is an outer diameter gripping type as described above. According to this, when the gripping surface of the sub-collet is configured in a reverse taper shape according to the shape of the material to be gripped, the material to be gripped will receive the processing force when subjected to an axial processing force or impact. Further, the possibility that the position shifts to the tip side in the axial direction opposite to the direction of the impact increases, and the above configuration of the present invention can further prevent the position shift and avoid the damage to the gripped material. Become prominent.
  • the main collet is provided with a guide surface extending in the axial direction on the inner periphery
  • the sub-collet is provided with a guided surface in sliding contact with the guide surface and guided in the axial direction on the outer periphery.
  • the slit of the main collet and the slit of the sub-collet are formed to extend from the distal end edge in the axial direction toward the proximal end side, and the guide surface is an axis line with respect to the main inclined surface.
  • the guided surface is formed in a region disposed on the proximal side in the axial direction with respect to the sub-inclined surface.
  • the region on the tip side in the axial direction is configured to expand and contract
  • the guide surface is provided in a region arranged on the base end side in the axial direction with respect to the main inclined surface
  • the guided surface is provided in a region arranged on the base end side in the axial direction with respect to the sub-side inclined surface. Since it is provided, since the deformation of the guide surface and the guided surface when the main collet and the sub-collet are opened and closed is reduced, it is possible to suppress a decrease in guiding accuracy in the axial direction of the sub-collet with respect to the main collet.
  • a main side step is provided on the inner periphery of the main collet
  • a sub side step is provided on the outer periphery of the sub collet in the axial direction with respect to the main side step. It is preferable that the sub collet is prevented from coming off toward the tip end side in the axial direction with respect to the main collet by the sub side step contacting the main side step. According to this, the sub collet is prevented from coming off toward the front end side in the axial direction with respect to the main collet by the engagement structure of the main side step portion and the sub side step portion.
  • the secondary collet can be prevented from falling out of the main collet when the material to be grasped is discharged by a knockout pin or the like.
  • the secondary collet is returned to the retaining position by the axial spring when the gripping material is released.
  • the secondary collet can always be set to the initial position.
  • the structure for preventing the secondary collet from being removed from the primary collet is not limited to the configuration having the primary side stepped portion and the secondary side stepped portion, and as a result, the secondary collet is provided by a member provided separately from the collet chuck in the chuck device or machine tool. The collet may be held in the main collet.
  • At least one of the main-side inclined surface of the main collet and the auxiliary-side inclined surface of the sub-collet is formed with a groove that intersects with the axial direction. Since the corner portion of one inclined surface generated by providing this groove bites the other inclined surface, it is possible to reduce the positional deviation in the axial direction between the main collet and the sub-collet in the gripping state.
  • the chuck device of the present invention is configured to be movable in the axial direction with the above-described collet chuck and pressurizes the main collet in the axial direction to expand and contract in the radial direction (to generate a reduced diameter on the inner periphery). And a working member.
  • the acting member pressurizes the surface to be pressurized of the main collet
  • the main collet is operated, and the secondary side is interposed via the reverse tapered fitting structure of the primary side inclined surface and the secondary side inclined surface that are in contact with each other.
  • the collet also works.
  • the diameter of the main collet is reduced by pressurizing the action member, whereby the diameter of the sub-collet is reduced and the object to be grasped is gripped.
  • the surface to be pressed of the main collet is a surface pressed in the axial direction by the action member in order to expand and contract the inner diameter, and is tapered toward at least one side in the axial direction or It shall be comprised by reverse taper shape.
  • the sub-collet is retained in the main collet by being prevented from coming off at the tip end in the axial direction, and the chuck device attaches the sub-collet to the tip end in the axial direction with respect to the main collet. It is preferable to further comprise a biasing axial spring.
  • a method for manufacturing a processed product according to the present invention is a method for manufacturing a processed product in which the workpiece is processed by forming the processed product in a state where the workpiece is gripped by the chuck device.
  • the collet chuck, and an action member configured to be movable in the axial direction and pressurizing the main collet in the axial direction to expand and contract in the radial direction (for example, to reduce the inner diameter).
  • the main collet and the sub-collet are in a released state by disposing the operating member in a release driving position, and the workpiece is mounted on the inner peripheral side of the sub-collet, and then the operating member is The main collet and the sub-collet are placed in a gripping state by being placed in a grip driving position, and the workpiece is processed.
  • the sub-collet is held against the main collet by being prevented from coming off at the front end side in the axial direction, and the chuck device moves the sub-collet toward the front end side in the axial direction with respect to the main collet.
  • the chuck device moves the sub-collet toward the front end side in the axial direction with respect to the main collet.
  • the secondary collet is prevented from slipping off toward the distal end side in the axial direction, and is urged toward the distal end side in the axial direction by the axial spring, so that the secondary collet is axially moved when the workpiece is released. Since the spring returns to the retaining position, the sub collet can always be set to the initial position with respect to the main collet before the workpiece is inserted.
  • the accuracy of the introduction position of the workpiece in the axial direction with respect to the sub-collet can be increased, and as a result, the machining accuracy can be improved.
  • it is possible to prevent the sub collet from falling out of the main collet when the workpiece is taken out for example, when the gripping material is discharged by a knockout pin or the like.
  • the structure for preventing the secondary collet from coming off from the main collet may be provided between the main collet as described above, or between a member provided separately from the collet chuck in the chuck device or machine tool. It may be provided.
  • the sub-collet has a positioning locking portion (for example, a base end in the axial direction of the gripping surface) that locks and positions the workpiece from the base end side in the axial direction when in the released state. It is preferable that the workpiece is gripped by the sub collet in a state of being abutted against the positioning locking portion when being mounted on the inner peripheral side of the sub collet. According to this, since the workpiece is gripped by the secondary collet while being abutted against the positioning locking portion, the axial position of the workpiece relative to the secondary collet can be made constant. It is possible to reduce the variation in the dimension in the axial direction of the product obtained by processing the workpiece, and to increase the shape accuracy in the axial direction of the product.
  • a positioning locking portion for example, a base end in the axial direction of the gripping surface
  • the chuck device further includes an axial spring that biases the secondary collet toward the distal end in the axial direction with respect to the primary collet, and the workpiece is mounted on the secondary collet. It is preferable that the workpiece is held by the sub collet in a state where the workpiece is abutted against the positioning locking portion and the axial spring is compressed. According to this, since the axial spring biases the secondary collet toward the distal end side in the axial direction, the workpiece can be mounted from the distal end side of the secondary collet so that the axial spring is compressed.
  • the workpiece can be maintained in a state where it is abutted against the positioning locking portion, the workpiece can be reliably positioned when it is gripped by the sub-collet, and the workpiece is processed with respect to the sub-collet.
  • the positional accuracy in the axial direction of the material can be further increased.
  • the first step of mounting the workpiece on a spindle and performing a front machining, and passing the workpiece after the front machining is transferred to a back spindle provided with the chuck device It is preferable to include a second step of gripping the workpiece by the chuck device, and a third step of performing a back machining on the workpiece mounted on the back spindle.
  • another collet chuck of the present invention comprises a cylindrical main collet, and a cylindrical sub-collet arranged on the outer peripheral side of the main collet so as to be movable in the axial direction with respect to the main collet
  • the main collet is a plurality of slits extending in the axial direction and a surface provided on the inner periphery and pressed to expand and contract the outer diameter, and is tapered toward either side in the axial direction or
  • a pressure-receiving surface configured in an inversely tapered shape
  • a main-side inclined surface provided on the outer periphery and configured to be inclined toward the tip end side in the axial direction
  • the sub-collet is in the axial direction
  • a plurality of slits extending to the outer periphery, a gripping surface provided on the outer periphery for gripping the object to be gripped, a sub-side inclined surface provided on the inner periphery and configured in a tapered shape to contact the main
  • the sub collet has a positioning locking portion that locks and positions the gripped material from the base end side in the axial direction when in the released state (for example, on the base end side in the axial direction of the gripping surface). ) Is preferable.
  • the gripping surface of the sub collet is a frustum-shaped surface that is inclined obliquely toward the distal end side in the axial direction.
  • this gripping surface is preferably configured in a tapered shape that is inclined obliquely toward the tip end side in the axial direction.
  • the main collet has a guide surface extending in the axial direction on the outer periphery
  • the sub-collet has a guided surface in sliding contact with the guide surface and guided in the axial direction on the inner periphery.
  • the slit of the main collet and the slit of the sub-collet are formed so as to extend from the front end edge in the axial direction toward the base end side, and the guide surface is in relation to the main inclined surface.
  • the guided surface is formed in a region arranged on the base end side in the axial direction with respect to the sub-inclined surface.
  • a main side step is provided on the outer periphery of the main collet, and a sub side step is provided on the inner periphery of the sub collet in the axial direction with respect to the main side step. It is preferable that the sub collet is prevented from coming off toward the front end side in the axial direction with respect to the main collet by the step part coming into contact with the main side step part.
  • the gripping surface of the sub-collet has an engaging gripping portion protruding in the radial direction that enables jumping and gripping.
  • the positioning locking portion is provided apart from the proximal end side in the axial direction of the engagement gripping portion.
  • intersects an axial direction is formed in at least any one surface of the main side inclined surface of a main collet, and the sub-side inclined surface of a sub collet.
  • This other collet chuck can be used in the above chuck device. That is, instead of the action member, the action member is configured to be movable in the axial direction and is used together with an action member that pressurizes the main collet in the axial direction and expands or contracts in the radial direction (so that the outer diameter is increased).
  • the surface to be pressed of the main collet is a surface pressed in the axial direction by the action member in order to expand and contract the outer diameter, and is tapered toward at least one side in the axial direction. Or it shall be comprised by reverse taper shape.
  • the sub-collet is retained in the main collet by being prevented from coming off at the tip end in the axial direction, and the chuck device attaches the sub-collet to the tip end in the axial direction with respect to the main collet. It is preferable to further comprise a biasing axial spring.
  • the chuck device using the another collet chuck is used in the method for manufacturing a processed product of the present invention, and the main collet and the sub-collet are in a released state by disposing the action member at a release drive position. Then, the workpiece is mounted on the outer peripheral side of the sub-collet, and then the working member is disposed at a grip driving position to bring the main collet and the sub-collet into a gripping state, thereby processing the workpiece. It is characterized by that. In this case, the sub-collet is held against the main collet by being prevented from coming off at the front end in the axial direction, and the chuck device moves the sub-collet toward the front end in the axial direction with respect to the main collet.
  • the gripping surface of the sub-collet has a positioning locking portion that locks and positions the workpiece from the base end side in the axial direction when in the released state (for example, in the axial direction of the gripping surface)
  • the workpiece is gripped by the sub-collet in a state of being abutted against the positioning locking portion when being mounted on the outer peripheral side of the sub-collet.
  • the chuck device further includes an axial spring that biases the sub collet toward the front end in the axial direction with respect to the main collet, and the workpiece is mounted on the sub collet.
  • the workpiece is held by the sub collet in a state where the workpiece is abutted against the positioning locking portion and the axial spring is compressed.
  • a first step of mounting the workpiece on a spindle and performing a front machining, and passing the workpiece after the front machining is completed to a back spindle including the chuck device, and the chuck on the back spindle It is preferable to include a second step of gripping the workpiece by an apparatus and a third step of performing a back machining on the workpiece mounted on the back spindle.
  • the taper shape means that the taper is tapered toward the distal end side in the axial direction
  • the reverse taper shape is the taper shape toward the proximal end side in the axial direction.
  • the cylindrical shape is typically a cylindrical shape, but includes an arbitrary cylindrical shape such as an elliptical cylindrical shape, a long cylindrical shape, and a rectangular cylindrical shape.
  • the frustum-shaped surface means a surface having the shape of the side surface of the frustum, and is typically a truncated cone shape, but may be any shape such as an elliptical truncated cone shape, a long truncated cone shape, a truncated pyramid shape, etc. Includes frustum shape.
  • a collet chuck, a chuck device, and a processed product manufacturing method capable of improving the shape accuracy of a processed part and reducing the defect rate by preventing the gripping position from shifting in the axial direction. It is possible to achieve an excellent effect that can be realized.
  • front view (a) which shows the structure of 1st Embodiment of the collet chuck which concerns on this invention, longitudinal cross-sectional view (b), and sectional drawing (c) which shows the example of the workpiece
  • It is a disassembled perspective view which shows the structure of embodiment of the chuck apparatus which concerns on this invention including the collet chuck of 1st Embodiment.
  • FIG. 5 is process diagrams (a) to (e) showing an embodiment of a method for manufacturing a processed product according to the present invention, and a longitudinal sectional view (f) showing a structure example of a workpiece.
  • the front view (a) which shows 2nd Embodiment of the collet chuck which concerns on this invention, the longitudinal cross-sectional view (b) which shows a releasing state, the longitudinal cross-sectional view (c) which shows the state in the middle of transfer to a holding state, and a holding state It is a longitudinal cross-sectional view (d) shown. It is the longitudinal cross-sectional view (a) which shows the open state of 3rd Embodiment of the chuck
  • the collet chuck 10 of the present embodiment includes a main collet 11 configured as a whole (cylindrical in the illustrated example) and an axial tip inside the main collet 11.
  • the secondary collet 12 is formed in a cylindrical shape (cylindrical in the illustrated example) as a whole, and the axial direction of the secondary collet 12 is inside the main collet 11.
  • the main collet 11 extends from the distal end edge in the axial direction to the proximal end side (the right side in the figure) and is formed in a range from the middle position to the middle position, and includes a plurality of slits 11a provided (three in the illustrated example) around the axis line. Yes.
  • the base end portion of the slit 11a in the axial direction is a large circular (may be oval or elliptical) opening, and the portion on the tip end side (left side in the drawing) in the axial direction from this opening is It is configured in a slit shape having a certain width.
  • a pressed surface 11b configured in an inversely tapered shape (conical frustum shape) obliquely toward the proximal end side in the axial direction is formed on the outer peripheral portion in the axial formation region of the slit 11a.
  • the main collet 11 is configured such that the inner diameter of the main inclined surface 11c at the tip end portion in the axial direction is expanded and contracted by receiving pressure from a chuck sleeve (action member) described later on the pressed surface 11b. .
  • the main-side inclined surface 11c is provided on the inner periphery of the portion of the main collet 11 that is on the most distal side.
  • the main inclined surface 11c is a frustoconical surface having a predetermined taper angle along the axial direction, and has a reverse taper shape in which the inner diameter increases toward the distal end side of the main collet 11 in the axial direction. Yes. As shown in FIG.
  • annular grooves 11q1 and 11q2 orthogonal to the axis are formed on the main inclined surface 11c.
  • a cylindrical surface 11r disposed between the main-side inclined surface 11c and a main-side step portion 11e described later is formed in a portion adjacent to the base end side in the axial direction of the main-side inclined surface 11c.
  • the cylindrical surface 11r has the same inner diameter as the smallest diameter portion at the proximal end edge in the axial direction of the main inclined surface 11c.
  • a guide surface 11d made of a cylindrical surface having a constant inner diameter in the axial direction is formed in a region on the proximal end side in the axial direction with respect to the main inclined surface 11c.
  • a main side step portion 11e having a step surface facing the proximal end in the axial direction is provided between the guide surface 11d and the main inclined surface 11c.
  • the guide surface 11d and the main side step portion 11e are formed in a region in the axial direction in which the pressed surface 11b is provided on the outer periphery.
  • region is an area
  • the step surface of the main-side step portion 11 e is directed to the base end side in the axial direction and has a tapered step surface 11 e 1 having a truncated cone-like taper inclined obliquely toward the inner peripheral side.
  • the vertical step surface 11e2 is formed adjacent to the outer peripheral side of the tapered step surface 11e1 and orthogonal to the axis.
  • the tapered step surface 11e1 is in contact with the cylindrical surface 11r, and the vertical step surface 11e2 is in contact with the guide surface 11d.
  • the sub-collet 12 includes a plurality of (three in the illustrated example) slits 12a around the axis extending from the front end edge in the axial direction to the base end side.
  • the base end portion of the slit 12a in the axial direction is a large circular (may be oval or elliptical) opening, and the portion on the tip end side in the axial direction from the opening has a certain width. It has a slit shape.
  • the gripped material or workpiece hereinafter simply referred to as “work W”) is provided at the most distal end side in the axial direction. .) Is formed.
  • the gripping surface 12b only needs to be capable of gripping the outer diameter of the workpiece W by reducing the inner diameter of the sub-collet 12, and is generally configured as a cylindrical surface having a constant inner diameter in the axial direction. Good. However, in the illustrated example, the gripping surface 12b has a reverse tapered inner surface shape whose diameter is increased toward the distal end side in the axial direction.
  • the inner surface shape of the gripping surface 12b corresponds to the outer surface shape of the workpiece, and in this embodiment, the gripping surface 12b is designed to grip the workpiece W having a reverse tapered outer shape toward the tip end side in the axial direction. .
  • a positioning locking portion 12s is provided for contacting and locking from the base end side in the axial direction for positioning.
  • a sub-inclined surface 12 c that contacts the main-side inclined surface 11 c provided on the main collet 11 is formed on the outer peripheral portion of the sub-collet 12.
  • the sub-inclined surface 12c is provided at the most distal end portion of the sub-collet 12.
  • the sub-inclined surface 12c is formed in a truncated cone-like surface having a taper angle along the axial direction, and has a reverse tapered shape in which the outer diameter increases toward the tip end side in the axial direction of the sub-collet 12. Yes.
  • the sub-inclined surface 12c is in close contact with the main-side inclined surface 11c in a state where the workpiece W is gripped, so that the sub-inclined surface 12c has substantially the same taper angle as the main-side inclined surface 11c. It is formed.
  • a guided surface 12d made of a cylindrical surface having a constant inner diameter in the axial direction is formed on the inner periphery of the secondary collet 12 on the proximal end side in the axial direction with respect to the region where the secondary inclined surface 12c is formed.
  • a sub-stepped portion 12e having a stepped surface facing the base end side in the axial direction is provided between the guided surface 12d and the sub-side inclined surface 12c.
  • the sub-stepped portion 12e is configured in a truncated cone shape (reverse taper shape) that faces the distal end side in the axial direction and is inclined toward the outer peripheral side.
  • the guided surface 12d is in sliding contact with the guide surface 11d, whereby the sub collet 12 is guided so as to be movable in the axial direction with respect to the main collet 11.
  • the sub-side step part 12e is formed in the position and shape which fit the said main side step part 11e. Specifically, when the main step 11e and the sub step 12e are fitted, the sub step 12e is in close contact with the tapered step surface 11e1 of the main step 11e, but the vertical step surface 11e2. Is spaced from the surface of the sub-step 12e. Due to the engagement structure of the main side step portion 11e and the sub side step portion 12e, the sub collet 12 is retained on the tip end side in the axial direction while being accommodated in the main collet 11.
  • the workpiece W shown in FIG. 1 (c) having an outer surface shape corresponding to the inner surface shape of the gripping surface 12b of the sub-collet 12 has a shape extended in the axial direction and is inclined obliquely toward the proximal end side in the axial direction.
  • An outer peripheral envelope shape Wo (indicated by an alternate long and short dash line in the figure) having a reverse tapered shape is provided.
  • the outer peripheral surface shape constituting the outer envelope shape Wo there is a male screw structure formed around the axis.
  • a small-diameter end Wp that fits the positioning locking portion 12s is formed at the base end in the axial direction of the collet chuck.
  • an axial hole Wi is formed that opens at the opening end at the tip in the axial direction.
  • a hexagonal hole into which a tool such as a wrench is fitted may be mentioned.
  • the sub-collet 12 is guided by the guided surface 11d of the main collet 11 to the axis line.
  • the secondary side stepped portion 12e is positioned and held at an initial position where it contacts (fits) the main side stepped portion 11e.
  • the grooves 11q1 and 11q2 provided on the main inclined surface 11c are formed by the annular corners formed by providing the grooves 11q1 and 11q2 in the gripping state on the auxiliary inclined surface 12c. An axial displacement between the main inclined surface 11c and the sub inclined surface 12c is suppressed. However, these grooves 11q and 11q2 do not hinder sliding in the axial direction of the main inclined surface 11c and the sub inclined surface 12c in the released state.
  • the grooves 11q1 and 11q2 are formed on the main inclined surface 11c, but may instead be formed on the auxiliary inclined surface 12c, and may be formed on the main inclined surface 11c and the auxiliary inclined surface 11c. You may provide in both the side inclined surfaces 12c.
  • the groove may be formed so as to extend in a direction intersecting the axial direction.
  • the sub step 12e is in close contact with the tapered step surface 11e1 of the main step 11e, and the vertical step surface 11e2 A gap is formed between the sub-step 12.
  • the tapered step surface 11e1 formed on the inner peripheral side of the main step 11e is brought into contact with the sub step 12e, the sub collet 12 is positioned in the axial direction, and the vertical step formed on the outer periphery.
  • the tapered step surface 11e1 does not necessarily need to be tapered, and may be a step surface that can be in close contact with the sub-side step portion 12e in accordance with the surface shape of the sub-step portion 12e. That's fine.
  • the vertical step surface 11e2 does not necessarily need to be a vertical surface, and may be a surface separated from (not in contact with) the sub-stepped portion 12e.
  • FIGS. 4 and 5 show the structure of the chuck device 20 using the collet chuck 10 described above.
  • this collet chuck 10 is slightly different from the collet chuck 10 shown in FIGS. 1 to 3, and the grooves 11q1 and 11q2 are not formed, and the step surface of the main step 11e is entirely formed. It has a surface shape that is in close contact with the sub-step 12e. Even if configured in this way, the basic operational effects are the same as described above.
  • the collet chuck shown in FIGS. 4 and 5 and each member included in the collet chuck are denoted by the same reference numerals as in FIGS.
  • the chuck device 20 is a cap in which the collet chuck 10 is accommodated in a chuck sleeve 21 mounted on a main shaft (rear main shaft) 32 of a machine tool and attached to the chuck sleeve 21 from the front end side in the axial direction.
  • the nut 22 is positioned on the distal end side in the axial direction, and is assembled in a state of being biased toward the distal end side by a holding spring 23 such as a coil spring from the proximal end side in the axial direction.
  • the spring receiver 24 shown in FIG. 4 is a stopper that is attached to the chuck sleeve 21 and supports the proximal end side of the holding spring 23.
  • knockout pin 25 indicated by a two-dot chain line in FIG. 5 is inserted into the main collet 11 from the base end side in the axial direction.
  • the knockout pin 25 always stands by on the proximal end side in the axial direction, and when the workpiece W is discharged, it is driven by a separate mechanism so as to protrude toward the distal end side in the axial direction. Eject to the tip end in the axial direction and discharge.
  • the chuck sleeve 21 is attached coaxially to the collet chuck 10 with respect to the main shaft 32.
  • a longitudinal groove 21a is formed in the outer peripheral portion of the chuck sleeve 21 on the proximal end side in the axial direction.
  • the longitudinal groove 21a is fitted to the main shaft 32 so that the chuck device 20 rotates around the axis integrally with the main shaft 32.
  • the chuck sleeve 21 functions as an action member for expanding and contracting the main collet 11 and the sub-collet 12 of the collet chuck 10 in the radial direction.
  • a frustoconical (reverse tapered) pressure surface 21b is formed so as to open toward the distal end side in the axial direction. .
  • the chuck sleeve 21 is moved in the axial direction by a known drive mechanism.
  • the tip portions of the main collet 11 and the sub-collet 12 are in a released state that spreads to the outer peripheral side.
  • the pressing surface 21b presses the pressed surface 11b, and the main collet 11 and The secondary collet 12 can be reduced in diameter to be in a gripping state.
  • the cap nut 22 includes an opening 22a through which the axial end portions of the main collet 11 and the sub-collet 12 can pass, and a positioning surface 22b at the opening inner edge of the opening 22a is an outer peripheral step of the main collet 11. It is in contact with the portion 11p.
  • the base end portion of the cap nut 22 is fixed to the main shaft 32 by a screw structure or the like.
  • the collet chuck 10 is positioned in the axial direction by being urged toward the distal end side in the axial direction by the holding spring 23 while being in contact with the positioning surface 22 b of the cap nut 22.
  • the collet chuck 10 is positioned and fixed in the axial direction with respect to the main shaft 32 even when the chuck sleeve 21 moves in the axial direction relative to the main shaft 32 and the collet chuck 10 is opened and closed. Is done.
  • FIG. 6 (a) showing the released state the slits 11a and 12a are drawn more open than actual in order to emphasize the expanded state of the main collet 11 and the sub-collet 12.
  • the natural state is such that no external force is applied, and the gripping force is not generated on the workpiece W (not shown).
  • the pressed surface 11b of the main collet 11 abuts on the pressing surface 21b of the chuck sleeve 21 as shown, or the outer periphery of the tip of the main collet 11 is the opening 22a of the cap nut 22.
  • the axial displacement of the gripping surface 12b of the sub-collet 12 can be avoided as a result. Can do. This is because a defect when inserting the workpiece W into the chuck device 20 in the manufacturing method described later, that is, the workpiece W is not aligned with the tip opening of the gripping surface 12b of the sub-collet 12, and the workpiece W is aligned with the sub-collet 12. It is possible to prevent the situation where it cannot be inserted into the inside of the machine.
  • FIG. 6B showing the gripping state
  • the workpiece W is inserted into the auxiliary collet 12 from the axial front end side (left side in the drawing), and the diameter of the workpiece W is reduced through the main collet 11 by the pressing force of the chuck sleeve 21.
  • the gripping surface 12a of the secondary collet 12 grips the workpiece W.
  • the workpiece W is provided on the proximal end side in the axial direction of the gripping surface 12a.
  • the sub collet 12 compresses the axial spring 13 and moves slightly toward the proximal end in the axial direction. At this time, since the guided surface 12d of the sub collet 12 is guided in the axial direction by the guide surface 11d of the main collet 11, the axial displacement of the sub collet 12 hardly occurs. Thereafter, as shown in FIG. 6B, the workpiece W is gripped by the gripping surface 12 b by the movement of the chuck sleeve 21. At this time, when the grooves 11q1 and 11q2 are formed as shown in FIGS.
  • the corners formed by the grooves 11q1 and 11q2 are formed between the main-side inclined surface 11c and the sub-side inclined surface 12c.
  • the displacement in the axial direction of the sub collet 12 relative to the main collet 11 when shifting from the released state to the gripping state is reduced.
  • the groove is provided on the sub-inclined surface 12c.
  • the gripping surface 12b of the sub collet 12 is formed in a reverse taper shape that is inclined obliquely toward the distal end side in the axial direction. Therefore, it is easy to move to the tip side in the axial direction. Therefore, if the workpiece W is subjected to drilling or bleaching from the distal end side in the axial direction in the gripping state shown in FIG. 6B, the machining force toward the proximal end side in the axial direction is applied to the workpiece W.
  • the workpiece W may be displaced in the axial direction due to the impact caused by the fluctuation of the machining force and the gripping force applied from the reverse tapered gripping surface.
  • the gripping surface 12b or the workpiece W is reversely tapered or tapered. Regardless of whether the shape is cylindrical or cylindrical, the workpiece W may be displaced toward the proximal end in the axial direction by applying the processing force.
  • the sub-inclined surface 12c of the sub-collet 12 is formed in a reverse taper shape, and has a reverse-tapered fitting structure in contact with the reverse-tapered main-side inclined surface 11c of the main collet 11. is doing.
  • the sub collet 12 also tends to move toward the base end side in the axial direction with respect to the main collet 11, so Since the gripping force applied to the workpiece W by the gripping surface 12b increases due to the fitting structure, the displacement of the workpiece W in the axial direction (particularly toward the tip end in the axial direction due to the reverse taper shape of the gripping surface 12b and the workpiece W). Misregistration) is suppressed.
  • the grooves 11q1 and 11q2 are formed as shown in FIGS.
  • the corners formed by the grooves 11q1 and 11q2 are formed between the main-side inclined surface 11c and the sub-side inclined surface 12c.
  • the positional deviation in the axial direction of the sub collet 12 relative to the main collet 11 due to the processing force is further reduced.
  • the groove is provided on the sub-inclined surface 12c.
  • the workpiece W is inserted when the workpiece W is inserted into the sub-collet 12 in the released state of the chuck device 20. Is positioned on the base end side in the axial direction by abutting against the positioning locking portion 12s, and the workpiece W is gripped by the sub-collet 12 in this positioning state, so that the position accuracy of the workpiece W in the axial direction relative to the sub-collet 12 and The reproducibility can be improved.
  • the axial spring 13 biases the sub collet 12 toward the front end side in the axial direction with respect to the main collet 11, the positioning accuracy of the workpiece W and the sub collet 12 in the axial direction is further improved. Therefore, by making the machining reference of the workpiece W the sub collet 12, the machining accuracy in the axial direction of the workpiece W can be improved and the reproducibility of the machining shape can be improved.
  • the headstock 1 is equipped with a main shaft 2, and the raw material W 0 of the workpiece W is gripped by a chuck device 3 provided at the tip of the main shaft 2.
  • the raw material W0 is, for example, a round bar, and may be a material previously formed in a predetermined length corresponding to the workpiece W, or it is assumed that a spindle moving type automatic lathe (Swiss type automatic lathe) or the like is used.
  • the long material may be used.
  • it is preferable to use the guide bush device 4 (shown by dotted lines) in order to increase the processing accuracy, particularly when the above long material is used.
  • the raw material W0 is processed by an appropriate tool 5 while being held by the main shaft 2 as shown in FIG.
  • the tip of the raw material W0 is processed into a taper shape, and screw processing or the like is performed as necessary.
  • a dental implant material dental implant fixture, dental implant abutment, etc.
  • a saddle shape of the outer surface of the product is formed, and then a detailed structure of the outer surface, for example, Mold external thread structure (tapping screw, etc.).
  • the cross-sectional shape of the product workpiece W2 made of this dental implant material or the like is shown in FIG. 7 (f), and details will be described later.
  • the saddle shape on the outer surface of the dental implant material has a tapered shape
  • the outer surface of the workpiece W0 is processed into a tapered shape as shown in FIG. 7B.
  • the spindle 32 mounted on the back spindle stock 31 is arranged on the same axis as the spindle 2, and the chuck device 20 is arranged at a position facing the raw material W0.
  • the back spindle mechanism including the spindle 32 is preferably movably provided with the spindle 2 in the machine tool.
  • the spindle 2 It may be provided in a device different from the device having it.
  • the back spindle stock 31 is moved in the axial direction, and the tip portion of the raw material W0 held by the main shaft 2 is moved to the released chuck device shown in FIG. 6 (a). 20 are inserted into the above-mentioned secondary collets 12.
  • the positioning locking portion 12s is provided on the gripping surface 12b of the sub-collet 12 as described above, the distal end portion of the raw material W0 comes into contact with the positioning locking portion 12s, and FIG.
  • the secondary collet 12 is slightly pushed toward the proximal end in the axial direction. At this time, since the secondary collet 12 is urged toward the distal end side in the axial direction by the axial spring 13, the distal end portion of the raw material W0 is maintained in contact with the positioning locking portion 12s.
  • the insertion depth of the raw material W0 with respect to the secondary collet 12 is set according to the positional relationship between the main shaft 2 and the main shaft 32.
  • the axial position of the leading end portion of the raw material W0 in the gripping surface 12b is in the axial direction of the main shaft 2 and the main shaft 32 with reference to the initial position of the sub collet 12 positioned by the axial spring 13 in the released state. Determined by the relative spacing of.
  • the gripping surface 12b has a reverse taper shape corresponding to the outer shape portion excluding the front end portion and the rear end portion of the workpiece W as in the present embodiment. Although it has an inner shape, there may be a case where it does not have a portion reflecting the shape of the small diameter end Wp of the workpiece W. In addition, when the entire workpiece W is not reversely tapered and has a cylindrical portion at least in a partial region in the axial direction, the gripping surface 12b on the cylindrical surface for gripping the cylindrical portion, It is also possible to do.
  • the chuck device 20 shifts to the gripping state. That is, the chuck sleeve 21 is driven in the axial direction, and the main collet 11 and the sub-collet 12 are reduced in diameter to grip the leading end portion of the raw material W0 as shown in FIG.
  • a tool 6 such as a parting tool
  • FIG. 7D shows a state in which the back spindle stock 32 is separated from the spindle stock 1 while the chuck device 20 of the back spindle 32 grips the intermediate work W1.
  • the back surface machining is performed on the intermediate workpiece W1 held by the chuck device 20 of the back spindle 32.
  • the cutting surface of the intermediate workpiece W1 is drilled with a drill or broach shown as the tool 7, or a tool engagement such as a hexagonal hole is performed. It is typical to form a structure or to perform processing toward the base end side in the axial direction.
  • machining is performed in such a manner that a machining force is directly applied to the base end side in the axial direction of the chuck device 20 as shown in the drawing, but the outer peripheral surface (from the chuck device 20) by a cutting tool or the like.
  • the machining is performed in such a manner that the tool is sent to the base end side in the axial direction with respect to the work W1
  • the machining force directed toward the base end side in the axial direction is indirectly applied to the workpiece. Will join W1.
  • the outer peripheral envelope shape Wo of the intermediate workpiece W1 is formed in a reverse taper shape that is inclined obliquely toward the base end side in the axial direction, and correspondingly, the gripping surface 12b of the sub collet 12 is configured. Is formed in a reverse taper shape inclined obliquely toward the tip end side in the axial direction.
  • the gripping state of the intermediate workpiece W1 by the gripping surface 12b of the sub-collet 12 is inherently unstable, and the tip side in the axial direction of the gripping force Due to the component toward, the intermediate workpiece W1 may be displaced toward the tip in the axial direction when receiving an impact.
  • the auxiliary collet 12 has an axial tip with respect to the main collet 11. There is also a possibility of causing a position shift to the side.
  • the gripping force exerted on the intermediate workpiece W1 by the gripping surface 12b of the sub-collet 12 increases due to the above reasons even when receiving an impact as described above. Since the tightening force also increases, it is possible to avoid the displacement of the intermediate workpiece W1 and the sub collet 12 described above. Of course, even when the positioning lock 12s is not provided on the gripping surface 12b and the intermediate workpiece W1 may be displaced toward the proximal end in the axial direction, the displacement can be suppressed.
  • the grooves 11q1 and 11q2 of the main inclined surface 11c cause the corners formed by the grooves to be opposed to the opposing inclined surface 12c in the gripped state. Since it bites against the main collet 11, the axial displacement of the sub collet 12 with respect to the main collet 11 is further less likely to occur. The same applies to the case where the groove is provided on the sub-inclined surface 12c.
  • the finished workpiece W2 is discharged from the chuck 20 using the above-described knockout pin 25 or the like.
  • the product workpiece W2 as shown in FIG. 6 (f), one constituting a dental implant can be cited.
  • This product workpiece W2 has an outer peripheral envelope shape that is tapered in the axial direction, and an outer peripheral screw structure Ws that forms a tapping screw or the like is formed on the outer peripheral surface. Further, a proximal end in the axial direction is provided with a small-diameter end Wp having a convex curved surface shape.
  • the outer envelope shape, the outer thread structure Ws, and the small diameter end Wp are formed by the main surface processing.
  • the length of the product workpiece W2 in the axial direction is determined by the cutting process at the time of delivery from the main spindle 2 to the rear main spindle 32.
  • the length in the axial direction can be increased, and Consistency with the shape (shaft hole Wi) formed by back surface processing can be improved.
  • a shaft hole Wi is formed in the product workpiece W2 so as to open to the opening end on the tip end side in the axial direction. The shaft hole Wi is formed by the back surface processing.
  • a collet chuck 10 'shown in FIG. 8 has a main collet 11', an axial spring 13 'and a spring receiver 14' which are basically the same as those in the first embodiment, but are arranged inside the main collet 11 '.
  • the structure of the sub collet 12 ' is different.
  • the sub-collet 12 'of the present embodiment is similar to the above in that it includes a sub-side inclined surface 12c' that is in close contact with the main-side inclined surface 11c 'provided on the tip side in the axial direction of the main collet 11'.
  • an engaging grip portion 12b' protruding from the outer peripheral side to the inner peripheral side is formed as a portion corresponding to the grip surface 12b.
  • the engagement gripping portion 12b ′ protrudes to the inner peripheral side from the inner peripheral surface on the proximal end side in the axial direction of the sub-collet 12 ′.
  • this is a so-called jumping grasp so that the large-diameter portion Ws ′ having a large outer diameter protruding toward the outer peripheral side can grip the workpiece W ′ formed on the proximal end side in the axial direction. This is to make it possible.
  • the engagement gripping portion 12b' exceeds the large diameter portion Ws' and is on the tip end side in the axial direction.
  • the locking member 12t ′ is attached and fixed to the base end side in the axial direction from the engagement gripping portion 12b ′ of the sub-collet 12 ′.
  • the locking member 12t ′ is fixed to the base end portion of the sub collet 12 ′ by screwing or the like.
  • a positioning locking portion 12s ′ is formed at the tip of the locking member 12t ′ in the axial direction so as to contact the workpiece W ′ and perform positioning in the axial direction.
  • the positioning locking portion 12s ' is disposed at a position spaced apart from the engagement gripping portion 12b' on the proximal end side in the axial direction so that the large diameter portion Ws 'of the workpiece W' can be accommodated.
  • a cylindrical guide member 11d ′ is attached on the proximal end side in the axial direction.
  • a guided surface 12d' provided on the outer peripheral surface of the base end portion of the sub-collet 12 'is guided so as to be slidable in the axial direction.
  • the auxiliary collet 12 ' is housed inside the guide member 11d' and is axially distal by an axial spring 13 'supported by a spring receiver 14' attached to the axial base end of the main collet 11 '. Is biased to the side.
  • a positioning pin 12e ' is attached to the base end portion of the sub-collet 12', and this positioning pin 12e 'is inserted into a positioning hole 11e' provided in the guide member 11d '.
  • the positioning pin 12e' comes into contact with the tip end edge in the axial direction of the positioning hole 11e ', so that the sub-collet 12' is axial with respect to the main collet 11 '. It is positioned on the tip side in the direction and is in a state of being prevented from coming off.
  • the secondary collet 12 'of the secondary collet 12' is guided by the primary inclined surface 11c 'of the primary collet 11', whereby the secondary collet 12 'is reduced in diameter, and the engaging gripping portion 12b' is
  • the outer surface of the gripped portion having a small outer shape on the tip end side in the axial direction is closer to the larger diameter portion Ws ′ of the workpiece W ′. Further, when the workpiece W ′ is pushed in, the positioning pin 12e ′ comes into contact with the proximal end edge in the axial direction of the positioning hole 11e ′ and is positioned.
  • the positioning pin 12e ′ in the gripping state, the positioning pin 12e ′ is in contact with the axial base end edge of the positioning hole 11e ′, and the sub-collet 12 ′ is positioned in the axial direction with respect to the main collet 11 ′.
  • the gripping force can be temporarily increased even if the auxiliary collet 12 'hardly moves in the axial direction.
  • the positioning pin 12e ′ and the axial base end edge of the positioning hole 11e ′ are arranged so that the secondary collet 12 ′ can move to the base end side in the axial direction with respect to the main collet 11 ′ even in the gripping state.
  • the positioning hole 11e ′ may have no opening edge on the base end side in the axial direction.
  • FIG. 9 is a longitudinal sectional view showing a released state (a) and a gripped state (b) of a chuck device 20 ′′ having a third embodiment of another collet chuck.
  • This collet chuck Is a collet chuck of an inner diameter gripping type that grips the inner diameter of the work from the inside, and has a structure in which the relationship between the inner peripheral side and the outer peripheral side is reversed from the collet chuck 10 of the first embodiment.
  • the pressurized surface 11b ′′ includes a tip-side pressurized surface portion having a reverse taper shape (conical truncated cone shape) formed on the distal end side in the axial direction and a tapered shape (conical truncated cone shape) formed on the proximal end side in the axial direction. ) Of the base end-side pressed surface, and is pressed by pressure surfaces 21a "and 22a" of the action member, which will be described later.
  • a tapered (conical frustum-shaped) main-side inclined surface 11c ′′ is formed obliquely toward the distal end side in the direction.
  • the collet chuck in the illustrated example is formed from the distal end edge in the axial direction and extends toward the proximal end side.
  • it has a split collet structure in which slits 11a ′′ that extend and slits 11a ′′ (not shown) that are formed from the base edge in the axial direction and extend toward the distal end are alternately formed as seen around the axis, Formed from the leading edge of the direction and extending to the proximal side It may have a single split collet structure having only split Ri.
  • a pressure surface 21a ′′ having a reverse taper shape (conical truncated cone shape) obliquely directed toward the base end side in the axial direction is provided.
  • a first action member 21 ′′ having a slide shaft portion 21b ′′ extending toward the base end side in the axial direction and a slide shaft portion 21b ′′ of the first action member 21 ′′ are movably inserted in the axial direction.
  • the second action member 22 is fixed to a main shaft (not shown), and the position of the first action member 21" can be changed back and forth by a drive mechanism (not shown).
  • a cylindrical (cylindrical) sub-collet 12 ′′ is disposed on the outer peripheral side of the main collet 11 ′′.
  • the sub-collet 12 ′′ has a plurality of slits 12a ′′ formed from the front end edge in the axial direction and extending toward the proximal end around the axis.
  • a sub-inclined surface 12c ′′ that is in close contact with the main-side inclined surface 11c ′′ provided on the outer periphery of the main collet 11 ′′ is inclined toward the front end side in the axial direction. It is formed as a surface (conical frustum shape).
  • a base end portion extending in a cylindrical shape is formed in a region where the slit 12a ′′ is not formed, and the inner surface of the base end portion is shown in FIG. 9 (a).
  • it is a guided surface 12d "guided by the guide surface 22b" of the second acting member 22 ".
  • the base end portion of the sub-collet 12" has an axial direction of the main collet 11 ".
  • a step surface 12e ′′ that engages with an end surface 11e ′′ provided at the base end of the main collet 12 ′′ is provided, and the sub-collet 12 ′′ is axially oriented with respect to the main collet 11 ′′ by contact between the end surface 11e ′′ and the step surface 12e ′′.
  • the sub-collet 12 ′′ is biased toward the distal end side in the axial direction by an axial spring 13 ′′ disposed on the proximal end side in the axial direction.
  • the gripping surface 12b ′′ provided on the outer periphery of the sub-collet 12 ′′ is formed in accordance with the shape of the inner diameter portion of the work W ′′.
  • the gripping surface 12b ′′ is drawn as a simple cylindrical surface. It is.
  • the gripping surface 12b ′′ may be formed on a tapered (conical frustum) surface that is inclined obliquely toward the tip end in the axial direction. If it does in this way, the effect similar to 1st Embodiment which has the said holding surface 12b will be acquired.
  • a positioning locking portion 12s formed as a stepped surface projecting outward from the gripping surface 12b ".
  • the positioning locking portion 12s" When W ′′ is mounted from the front end side in the axial direction to the outer peripheral side of the sub-collet 12 ′′, it comes into contact with the edge of the work W ′′ and positions the work W ′′ in the axial direction.
  • the workpiece W ′′ is mounted on the outer periphery of the sub-collet 12 ′′ from the tip end side in the axial direction in the released state shown in FIG. 9 (a). At this time, the work W ′′ is brought into contact with the positioning locking portion 12 s ′′ as necessary. At this time, the sub-collet 12 ′′ is compressed against the main collet 11 ′′ by the axial spring 13 ′′ and is axially moved. Then, when the first working member 21 ′′ is moved to the proximal side in the axial direction with respect to the second working member 22 ′′, the surface 11b ′′ to be pressed of the main collet 11 ′′.
  • the diameter of the main collet 11 is increased, and the main-side inclined surface 11c" of the main collet 11 "expands the auxiliary-side inclined surface 12c” to thereby expand the auxiliary collet.
  • the diameter is increased by 12 ′′.
  • the gripping surface 12b ′′ of the sub collet 12 ′′ grips the inner diameter of the workpiece W ′′ from the inside.
  • the sub collet 12 ′′ moves in the axial direction with respect to the main collet 11 ′′.
  • the gripping force of the gripping surface 12b ′′ of the sub-collet 12 ′′ on the workpiece W ′′ increases due to the tapered fitting structure of the main-side inclined surface 11c ′′ and the sub-side inclined surface 12c ′′. Therefore, the displacement of the workpiece W ′′ and the sub collet 12 ′′ in the axial direction is prevented, and damage to the workpiece W ′′ due to the displacement is also suppressed.
  • a cylindrical extension portion extending toward the base end side in the axial direction is formed in the main collet 11 ′′, and an outer peripheral surface of the extension portion is defined as a guide surface 11d ′′.
  • the guided surface 12d ′′ of the sub-collet 12 ′′ may be guided along the guide surface 11d ′′ in the axial direction.
  • the base end surface of the extension is used as the main side step portion 11e ′′.
  • the main side step portion 11e ′′ abuts on the sub side step portion 12e ′′ of the sub collet 12 ′′ so that the sub collet 12 ′′ is positioned in the axial direction with respect to the main collet 11 ′′ so as to be prevented from coming off. It may be.
  • the manufacturing method of the collet chuck, the chuck device, and the processed product according to the present invention is not limited to the illustrated examples described above, and various changes can be made without departing from the scope of the present invention.
  • the anti-slip structure of the grooves 11q1 and 11q2 shown in FIGS. 1 to 3 of the first embodiment and the anti-slip structure of the main side step portion 11e and the sub side step portion 12e may be used in the second embodiment.
  • the above-described anti-slip structure may be used for a corresponding part in the third embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
PCT/JP2014/060139 2014-04-08 2014-04-08 コレットチャック、チャック装置、及び、加工製品の製造方法 WO2015155827A1 (ja)

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JP2016512505A JP6208851B2 (ja) 2014-04-08 2014-04-08 コレットチャック、チャック装置、及び、加工製品の製造方法
PCT/JP2014/060139 WO2015155827A1 (ja) 2014-04-08 2014-04-08 コレットチャック、チャック装置、及び、加工製品の製造方法
KR1020167020689A KR101801502B1 (ko) 2014-04-08 2014-04-08 콜릿 척, 척 장치, 및 가공 제품의 제조 방법
TW104101297A TWI574773B (zh) 2014-04-08 2015-01-15 筒夾夾頭、夾頭裝置及加工製品之製造方法

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105364518A (zh) * 2015-11-28 2016-03-02 重庆华洋单向器制造有限公司 传动轴夹持装置
US10639726B2 (en) 2016-06-14 2020-05-05 Schaublin Sa Flexible coupling for attaching a collet to a draw bar
CN112236275A (zh) * 2018-06-18 2021-01-15 株式会社大雅精机制作所 操作单元和操作装置
US20210220924A1 (en) * 2020-01-16 2021-07-22 Schaublin Sa Flexible collet assembly with limited radial stiffness
CN114043382A (zh) * 2021-10-12 2022-02-15 广州群创数控机床有限公司 一种工装夹具

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US10639726B2 (en) 2016-06-14 2020-05-05 Schaublin Sa Flexible coupling for attaching a collet to a draw bar
CN112236275A (zh) * 2018-06-18 2021-01-15 株式会社大雅精机制作所 操作单元和操作装置
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CN114043382A (zh) * 2021-10-12 2022-02-15 广州群创数控机床有限公司 一种工装夹具

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JPWO2015155827A1 (ja) 2017-04-13

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