JP2007069289A - Tool holder unit and tool magazine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool holder unit allowing the easy aligning of a through hole formed at a holder body and a through hole formed at a ball fastening ring in the tool holder unit, in which the hard metal ball fastening ring is mounted to a synthetic resin holder body, and a tool magazine provided with the tool holder unit; and to provide the tool holder unit capable of strongly fixing the ball fastening ring to the holder body and the tool magazine provided with the tool holder unit. <P>SOLUTION: The hard metal ball fastening ring 40 is inserted into the synthetic resin holder body 20. A key 27 is provided on the inner wall of a ring storing hole 24 of the holder body 20. A key groove 42 is formed on the outer wall of the ball fastening ring 40. By fitting the key 27 and the key groove 42, each of the first and second through holes 26 and 41 is communicated. A ring holding metal fitting 50 having a substantial L-shape in cross section is provided to regulate the movement of the ball fastening ring 40 in a removing direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tool holder unit and a tool magazine.

  A machine tool such as a machining center is known in which a tool magazine for waiting a plurality of tool tools is provided (see, for example, Patent Document 1). Specifically, a plurality of tool holder units are provided in the tool magazine, and a plurality of tool tools are on standby by holding tool tools in each tool holder unit. The tool tool held by the tool holder unit is mounted on the spindle of the machine tool by an automatic tool changer. As a result, it is possible to sequentially process a workpiece by mounting a desired tool tool on the spindle.

Here, a conventional configuration of the tool holder unit will be described with reference to FIG. The tool holder unit 100 has a cylindrical holder main body 101, and a shank accommodation hole 102 and a pull stud accommodation hole 103 are continuously provided therein. The diameter of the shank accommodation hole 102 decreases toward the pull stud accommodation hole 103, whereas the diameter of the pull stud accommodation hole 103 is substantially the same. The tool tool 110 is attached and detached from the tip opening of the shank receiving hole 102. In addition, a plurality of through holes 104 extending in the direction substantially orthogonal to the axis of the holder main body 101 and penetrating inward and outward are provided in the wall portion around the pull stud accommodation hole 103 in the holder main body 101. A ball 105 as an engaging member is inserted into the hole 104 (FIG. 7 shows one of them). The ball 105 is urged toward the pull stud accommodation hole 103 by a compression spring 106. When the tool tool 110 is inserted into the tool holder unit 100, the tool 105 is held in the tool holder unit 100 by the balls 105 being engaged with the engagement grooves 111 formed in the tool tool 110. Is done. By pulling out the held tool tool 110 with a predetermined force, the engagement with the engagement groove 111 of the ball 105 is released, and the tool tool 110 can be detached from the tool holder unit 100.
JP-A-2005-103687

  In the tool holder unit having the above-described configuration, a configuration in which the holder main body is molded from a synthetic resin rather than from a metal is conceivable so as to facilitate the molding. However, since the strength of the synthetic resin is lower than that of metal, there is a possibility that cracking or the like may occur around the ball due to the force received according to the displacement of the ball when the tool tool is attached or detached.

  In order to cope with the above problem, a configuration in which the periphery of the ball is made of a hard metal and the other part is made of a synthetic resin can be considered. As this configuration, for example, a configuration in which a so-called insert molding is performed in which a hard metal is inserted in advance into a mold for molding the holder main body and a synthetic resin is poured therein is assumed. However, with such a configuration, the structure of the mold becomes complicated, and further, it becomes necessary to form a through hole into which a ball is inserted after molding, thereby complicating the work of forming the through hole, resulting in a manufacturing cost. May become high.

  Therefore, the present inventor has come up with a configuration in which a hard metal ball retaining ring similarly formed with a through hole is attached and fixed to a synthetic resin holder body with a through hole formed therein. Thereby, generation | occurrence | production of the crack etc. in a ball periphery can be suppressed in the structure which made the holder main body synthetic resin, without complicating the structure of a metal mold | die, and the formation operation of a through-hole. However, in this structure, since both through-holes are formed separately, it may be difficult to align both through-holes when attaching a ball retaining ring to the holder body. Furthermore, as described above, since a predetermined force is applied when the tool tool is attached / detached, it is necessary to firmly fix the ball retaining ring to the holder body so that the ball retaining ring does not come off during attachment / detachment. .

  The present invention has been made in view of the above circumstances, and for engaging a tool tool while suppressing manufacturing cost by attaching a ring for fixing a hard metal ball to a holder body made of synthetic resin. A tool holder unit capable of improving the strength around the engaging member and further easily aligning the through hole formed in the holder main body and the through hole formed in the ring for retaining the ball, and the tool holder unit The first object is to provide a tool magazine provided.

  A second object of the present invention is to provide a tool holder unit capable of firmly fixing a ball retaining ring to a holder main body and a tool magazine including the tool holder unit.

  Hereinafter, effective means and the like for solving the above-described problems will be described with reference to actions, effects, and more specific means as required. In the following, in order to facilitate understanding, the corresponding configuration in the embodiment of the invention is appropriately shown in parentheses, but is not limited to the specific configuration shown in parentheses.

Means 1. A holder that accommodates the base end side of a tool tool (tool tool 70) having a cylindrical shape and a tool attached to the tip,
The holder has a plurality of through-holes extending in the direction orthogonal to the axial direction on the base end side and penetrating inward and outward, and a biasing member (compression spring 47) and the biasing force in each through-hole. A hard metal engaging member (rigid ball 46, plunger) that is biased by the member and partially protrudes toward the inner peripheral side of the holder and engages with an engaging groove (engaging groove 74b) formed in the tool tool. 95)
In the tool holder unit that detachably holds the tool tool by the engagement of these engaging members,
The holder is accommodated in a synthetic resin holder main body (holder main body 20) and a position where the through holes are formed by being inserted from the base end side of the holder main body. A ring made of hard metal (ball retaining ring 40) constituting the inner peripheral side of the holder, and a movement restricting metal fitting (ring holding metal fitting 50) fixed to the holder main body so as to abut against the end surface on the side opposite to the insertion direction of the ring. )
A main body side through hole (first through hole 26) is formed in the holder body, and a ring side through hole (second through hole 41) is formed in the ring.
A rotation positioning structure (key 27, key groove 42) between the holder main body and the ring is provided, and the main body side through hole and the ring side through hole are communicated with each other by the positioning to form the through hole. A featured tool holder unit.

  According to the means 1, the engagement member and the urging member for holding the tool tool in the tool holder unit are provided in each through hole formed in the holder. In such a case, a ring made of hard metal is accommodated in the holder body made of synthetic resin, and the movement restricting metal fitting is fixed to the holder body so as to come into contact with the end surface on the side opposite to the insertion direction of the ring. Thereby, the ring is attached to the holder body. And each engaging member protrudes from the ring side through-hole formed in the ring. Therefore, the displacement of the engaging member when attaching / detaching the tool tool is received by the ring made of hard metal, and in the configuration in which the holder body is made of synthetic resin, the tool holder unit is displaced by the displacement of the engaging member when attaching / detaching the tool tool. Is prevented from being damaged.

  In this configuration, by providing a rotational positioning structure between the holder main body and the ring, when the ring is accommodated in the holder main body, each main body side through hole and each ring side through hole are automatically communicated with each other. Can be easily aligned. As mentioned above, the strength around the engaging member is improved while holding down the manufacturing cost by attaching the ring made of hard metal with the ring side through hole to the holder body made of synthetic resin with the body side through hole formed. In the configuration described above, it is possible to easily align both the through holes. And the ease of position alignment of a through-hole is implement | achieved, The manufacturing efficiency of a tool holder unit can be improved and reduction of manufacturing cost can be aimed at. Moreover, according to this structure, rotation of a ring when attaching / detaching a tool tool can be suppressed.

Mean 2. Forming the ring in an annular shape;
Means 1 characterized in that the rotational positioning structure is constituted by a key (key 27) formed on one of the holder body and the ring and a key groove (key groove 42) formed on the other. Tool holder unit.

  According to the means 2, when the ring is accommodated in the holder main body so that the key and the key groove are fitted, each main body side through hole and each ring side through hole are in a state of communicating with each other. According to this structure, in the structure which formed the ring in the annular | circular shape, position alignment of a through-hole can be made easy with a simple structure.

  Means 3. The tool holder unit according to means 1 or 2, wherein the holder body is made of a thermoplastic resin.

  According to the means 3, even when the tool holder unit is dropped when the tool holder unit is transported at the time of shipment or the like, it is possible to suppress the holder body from being cracked by the impact at the time of dropping. it can. That is, the synthetic resin includes a thermosetting resin and a thermoplastic resin, but the thermoplastic resin is more elastic and easily absorbs an impact. Moreover, it becomes easy to absorb the stress at the time of attachment / detachment of a tool tool.

  Means 4. The movement restricting bracket is made of a steel plate, and is bent to form a first wall portion (first fixing plate 51) that is fixed to the holder body so as to abut against the end surface on the side opposite to the insertion direction of the ring. ) And a second wall portion (second fixing plate 52) extending in a direction substantially orthogonal to the first wall portion, and the second wall portion on the side wall (fixing wall portion 31) of the holder body. The tool holder unit according to any one of means 1 to means 3, which is fixed.

  According to the means 4, since the movement restricting bracket is made of a steel plate, it is possible to suppress breakage such as cracking when restricting the movement of the ring when the tool tool is attached. Moreover, the 2nd wall part extended in the direction substantially orthogonal to a 1st wall part is being fixed to the side wall of a holder main body. That is, the fixing direction of the movement restricting metal fitting with respect to the holder main body exists in a direction orthogonal to the attachment direction of the tool tool. Therefore, even if a large load is applied to the ring in the removal direction when the tool tool is attached, the ring can be reliably prevented from coming out.

  Means 5. The tool holder unit according to any one of means 1 to means 4, wherein a connection means (roller cam 57) for a tool magazine in which a plurality of the tool holder units are installed is provided on the movement restricting bracket.

  According to the means 5, the tool holder unit is installed in the tool magazine via the connecting means provided in the movement restricting metal fitting. Therefore, the load applied to the ring when the tool tool is attached is received by the connecting portion of the tool magazine via the movement restricting fitting and the connecting means. The tool holder unit is usually provided with a tool tool, and the connecting portion is firmly formed in order to stably support the tool holder unit to which the tool tool is attached. Therefore, by adopting a configuration that receives the above-described load at this connecting portion, even when a large load is applied to the ring in the removal direction when the tool tool is attached, it is possible to reliably prevent the ring from coming out. Can do.

  The connecting means may be any means for allowing the tool magazine to receive the weight load of the tool holder unit. For example, in a configuration in which the tool magazine includes a transport mechanism and a cam groove, and each tool holder unit moves along the shape of the cam groove as the transport mechanism operates, a roller cam meshed with the cam groove constitutes a connecting means To do. In this case, a load applied to the ring when the tool tool is attached is received by the cam groove via the movement restricting metal fitting and the roller cam. And since the cam groove needs to support a tool holder unit with a conveyance mechanism and is formed firmly, the receiving of the said load becomes effective. In addition, in this structure, since it is necessary to fix a tool holder unit with respect to a conveyance mechanism, a tool holder unit is provided with the holder support member which supports a holder so that rotation is possible. Incidentally, the technical idea of this configuration is that “a holder support member (fixing bracket 60) that supports the holder in a rotatable manner and is fixed to a transport mechanism is provided, and the movement restricting bracket is an anti-ring of the ring. A first wall portion (first fixing plate 51) fixed to the holder body so as to contact the end surface on the insertion direction side, and a second wall portion (second fixing plate 52) continuously extending from the first wall portion. And a roller cam (roller cam 57) that meshes with a cam groove extending in the transport mechanism is attached to the second wall portion.

  Further, in a configuration in which the tool magazine does not include a cam groove as described above, the tool holder unit is fixed to the tool magazine using a connecting means. In this case, in the configuration in which the tool holder unit is fixed to the tool magazine with a fixing tool such as a bolt or a screw, the through hole for passing the fixing tool or the fixing tool constitutes the connecting means. In this configuration, the load applied to the ring when the tool tool is attached is received by the fixing portion of the tool magazine with respect to the tool holder unit via the movement restricting fitting and the fixture. And since the fixing | fixed site | part needs to support a tool holder unit and is formed firmly, the receiving of the said load becomes effective.

  Means 6. On the inner peripheral side of the holder body, a restricting portion (stepped portion 22) that comes into contact with the insertion-side end surface of the ring excluding a predetermined range from the inner diameter position of the ring is provided, and the restricting portion and the movement restricting bracket The tool holder unit according to any one of means 1 to means 5, wherein the ring is sandwiched between the tool holder unit and the means.

  According to the means 6, the movement of the insertion direction of the ring is restricted by the restricting portion. In this configuration, the restricting portion is in contact with the insertion side end surface of the ring excluding a predetermined range from the inner diameter position of the ring. Therefore, even if the tool tool is pushed in beyond the engagement position when attached, it is possible to restrict further movement of the tool tool in the attachment direction by the ring. When a tool tool is attached to the tool holder unit, a large load is generally applied to ensure the attachment. In this case, since the movement of the tool tool in the mounting direction is restricted by hitting the ring made of hard metal instead of the holder body made of synthetic resin, the tool holder unit is prevented from being damaged when the tool tool is mounted. be able to. Moreover, in the structure provided with the said means 4 or the means 5, even if a big load is added to the removal direction with respect to a ring, it can suppress reliably that a ring slips out.

Mean 7 A tool magazine comprising a plurality of tool holder units (tool holder unit 10) and holding a tool tool (tool tool 70) in each of the tool holder units to wait for a tool tool to be attached to a spindle of a machine tool,
A tool magazine characterized in that each tool holder unit is the tool holder unit according to any one of means 1 to means 6.

  According to the means 7, with respect to all the tool holder units provided in the tool magazine, it is possible to improve the strength around the engaging member while suppressing the manufacturing cost, and further facilitate the alignment of the through holes. Thus, the manufacturing cost can be reduced. And in connection with this, the reduction of the manufacturing cost of a tool magazine provided with a plurality of tool holder units can be aimed at. Further, the ring can be firmly fixed with respect to all the tool holder units provided in the tool magazine.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  First, the tool holder unit 10 will be described with reference to FIGS. 1 is an exploded perspective view of the tool holder unit 10, FIG. 2 is a plan view of the tool holder unit 10, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG. .

  The tool holder unit 10 is for holding the tool tool 70 so that attachment or detachment is possible. As shown in FIG. 3, the tool tool 70 includes a shank portion 71 on the proximal end side, and a tool such as a slice cutter or a drill is fixed to the shank portion 71. The shank portion 71 has a substantially cylindrical shape, and is tapered toward the base end. The shank portion 71 includes a gripping portion 72 used when the tool tool 70 is attached to and detached from the tool holder unit 10, a taper portion 73 that is proximal to the gripping portion 72 and has a tapered shape, and a shank portion. 71 and a pull stud 74 that forms the most proximal end portion of 71.

  The tool holder unit 10 includes a holder main body 20, a ball retaining ring 40, a ring holding metal fitting 50, and a fixing metal fitting 60 as main components. The holder body 20 is formed of a thermoplastic resin such as polycarbonate resin or acrylic resin, and the ball retaining ring 40 is formed of a hard metal such as iron or copper. The ring holding metal fitting 50 and the fixing metal fitting 60 are formed by bending a steel plate. In addition, you may make the resin which comprises the holder main body 20 contain reinforced base materials, such as glass fiber and carbon fiber.

  The holder main body 20 has a substantially cylindrical shape, a cylindrical accommodating portion 21 that accommodates the tapered portion 73 of the tool tool 70, and a fixing bracket 60 that extends in the axial direction from the proximal end of the cylindrical accommodating portion 21. The fixed wall part 31 is comprised.

  As shown in FIG. 3, an annular stepped portion 22 projecting toward the inner peripheral side is integrally formed on the inner wall of the tubular housing portion 21, and the tubular housing portion 21 is sandwiched between the stepped portion 22. Is provided with a taper receiving hole 23 and a ring receiving hole 24. The taper accommodating hole 23 has a hole diameter that decreases toward the stepped portion 22 and is generally tapered. The shank portion 71 is inserted from the tip opening 23 a of the taper accommodation hole 23. In a state where the tool tool 70 is held by the tool holder unit 10, the grip portion 72 side of the taper portion 73 abuts on the taper accommodation hole 23, and the pull stud 74 side does not abut on the taper accommodation hole 23 and the taper accommodation hole 23. A slight gap is formed between the two. By forming the gap in this way, it is possible to absorb stress when the tool tool 70 is attached and detached.

  In addition, a rib 25 is integrally formed on the outer wall of the cylindrical housing portion 21. More specifically, a plurality of annular ribs 25a are formed along the circumferential direction of the cylindrical housing part 21 at a predetermined interval, and further extend in the axial direction of the cylindrical housing part 21 so as to connect the annular ribs 25a. A plurality of plate-like ribs 25b are formed. Therefore, the rib 25 has a lattice shape as a whole. The ribs 25 improve the strength of the cylindrical housing portion 21.

  The ring receiving hole 24 has the same hole diameter L1 over the entire axial direction, and the hole diameter L1 is the same as the outer diameter L1 of the ball retaining ring 40. The hole length of the ring receiving hole 24 is the same as the height dimension of the ball retaining ring 40. Further, as described above, the stepped portion 22 protrudes toward the inner peripheral side of the cylindrical housing portion 21, and the inner diameter L <b> 2 is smaller than the outer diameter L <b> 1 of the ball retaining ring 40. However, the inner diameter L <b> 2 of the stepped portion 22 is larger than the inner diameter L <b> 3 of the ball retaining ring 40. The ball retaining ring 40 is inserted into the ring housing hole 24 by being inserted into the ball retaining ring 40 from the tip opening 24 a of the ring housing hole 24 and supported by the step portion 22. In this case, the axis of the ring receiving hole 24 and the axis of the ball retaining ring 40 are on the same straight line. The inner diameter L3 of the ring receiving hole 24 is slightly larger than the maximum diameter L4 of the pull stud 74. The ball retaining ring 40 has a substantially cylindrical shape, and the outer diameter L1 and the inner diameter L3 have the same size over the entire axial direction. Moreover, both end surfaces are flat surfaces.

  As shown in FIG. 4, the ring accommodation holes 24 have first through holes 26 extending in a direction orthogonal to the axis of the cylindrical accommodation portion 21 and penetrating inward and outward at equal intervals in the circumferential direction (120 ° intervals). Three are formed. Correspondingly, the second through holes 41 extending in the direction orthogonal to the axis of the ball retaining ring 40 and penetrating inward and outward are also equally spaced in the circumferential direction (120 ° intervals). Three are formed. In addition, each 2nd through-hole 41 exists in the position biased to the level | step-difference part 22 side edge part in the ball retaining ring 40. FIG.

  Here, in the present embodiment, the key 27 extending in the axial direction is formed on the inner wall of the ring receiving hole 24, and correspondingly, the outer wall of the ball retaining ring 40 extends in the axial direction and both ends are opened. A keyway 42 is formed. The key 27 and the key groove 42 are formed over the entire axial direction of the ring receiving hole 24 and the ball retaining ring 40. The key 27 and the key groove 42 are disposed on the symmetry axis SL of each first through hole 26 and each second through hole 41. By fitting the key 27 into the key groove 42, the rotational direction position of the ball retaining ring 40 in the ring receiving hole 24 around the axial direction is determined. And in this determined position, each 1st through-hole 26 and each 2nd through-hole 41 are connecting.

  A rigid ball 46 is provided in each second through hole 41. Further, in each of the first and second through holes 26 and 41, there is provided a compression spring 47 for urging the hard sphere 46 toward the inner peripheral side of the ball retaining ring 40. Further, the compression spring 47 is predetermined. A set screw 48 with a hexagonal hole for holding in position is screwed in. Each rigid ball 46 is biased by each compression spring 47, and a part of the rigid ball 46 projects to the inner peripheral side of the ball retaining ring 40. In this case, the inner opening of the second through hole 41 is slightly smaller than the diameter of the rigid sphere 46, and the rigid sphere 46 is prevented from coming out of the second through hole 41. Further, the thickness dimension of the ball retaining ring 40 is larger than the diameter of the rigid sphere 46, and the rigid sphere 46 is not located in the first through hole 26. At the position where the hard sphere 46 protrudes, the substantial inner diameter L5 of the ball retaining ring 40 is smaller than the maximum diameter L4 of the pull stud 74.

  The movement of the ball retaining ring 40 in the removing direction is restricted by the ring holding metal fitting 50. Such a configuration will be described below. As shown in FIG. 1, the ring holding metal fitting 50 has an L-shaped cross section, and includes a first fixing plate 51 and a second fixing plate 52. As shown in FIG. 2, the ring holding metal fitting 50 is fixed in a state in which the first fixing plate 51 is in contact with the ring housing hole 24 side end portion of the cylindrical housing portion 21 by three bolts 53. The two fixing plates 52 are fixed in a state where they are in contact with the fixed wall portion 31 by means of hexagon socket bolts 54 and nuts 55. In FIG. 3, for convenience, one bolt 53 is omitted. In this case, the fixed wall portion 31 is formed with a rectangular through hole 32 penetrating inward and outward, and the first fixed plate 51 penetrates the through hole 32. The second fixed plate 52 is fixed in contact with the outer surface of the fixed wall portion 31. The wall portion 33 of the fixed wall portion 31 to which the second fixed plate 52 is fixed retreats inward by the thickness of the second fixed plate 52. As a result, the second fixing plate 52 does not protrude outward from the holder body 20.

  The first fixing plate 51 is formed with a through hole 56 having a hole diameter substantially the same as the inner diameter of the ball retaining ring 40 and having an axis located on an extension of the axis of the ball retaining ring 40. The first fixing plate 51 is in contact with the entire removal-side end surface of the ball retaining ring 40. Thereby, the movement of the ball retaining ring 40 in the removal direction is restricted. Moreover, since the ring holding | maintenance metal fitting 50 is being fixed to the holder main body 20 by both the 1st fixing plate 51 and the 2nd fixing plate 52, the movement of the removal direction of the ball retaining ring 40 can be controlled firmly. . Note that the front end of the pull stud 74 is accommodated in the through hole 56.

  A roller cam 57 is attached to the second fixing plate 52 of the ring holding metal fitting 50. Specifically, the base end of the hexagon socket head cap bolt 54 that fixes the second fixing plate 52 to the fixing wall portion 31 protrudes outward from the surface of the second fixing plate 52. Is rotatably provided.

  A fixed metal fitting 60 is attached to the fixed wall portion 31. Specifically, the fixed wall 31 penetrates through the wall 34 facing the wall 33 where the second fixing plate 52 of the ring holding metal fitting 50 is fixed so that the axis is located on the same straight line. A hole 35 is formed. A support shaft 59 is press-fitted into each of the through holes 35. On the other hand, the fixing bracket 60 is formed by bending, and thus includes a fixing plate 61 and a pair of fixing arms 62. A pair of fixed arms 62 are pivotally supported on the support shaft 59. Thereby, the fixing bracket 60 is attached to the fixed wall portion 31 so as to be rotatable about the support shaft 59.

  The fixing plate 61 of the fixing metal 60 is formed with through holes 63 at four corners, one each. Each through-hole 63 is used for passing a fixing bolt for fixing the fixing bracket 60 to a tool magazine for waiting a large number of tool tools 70. The fixing plate 61 is press-fitted with positioning pins 64 for positioning when the fixing plate 61 is fixed to the tool magazine.

  When the tool holder unit 10 described above is assembled, the ball retaining ring 40 is first inserted into the ring receiving hole 24 of the holder body 20. At this time, by fitting the key 27 and the key groove 42, the first through holes 26 of the holder body 20 and the second through holes 41 of the ball retaining ring 40 are in communication with each other. Thereafter, the ring holding fitting 50 is slid and inserted into the fixed wall portion 31 so that the first fixed plate 51 penetrates the through hole 32, so that the first fixed plate 51 is accommodated in the ring of the cylindrical accommodating portion 21. The second fixing plate 52 is brought into contact with the outer surface of the fixed wall portion 31 in contact with the end portion on the hole 24 side. Then, the first fixing plate 51 is fixed to the holder body 20 with the bolts 53. Further, by fixing the second fixing plate 52 to the holder main body 20 by passing the hexagon socket head cap screw 54 through which the roller cam 57 is inserted into the second fixing plate 52 and the fixing wall portion 31 and fixing the bolt with the nut 55, The roller cam 57 is attached to the holder body 20 at the same time. Finally, each support shaft 59 is press-fitted into each through-hole 35 of the fixed wall portion 31 while passing through each fixed arm 62 of the fixed bracket 60, whereby the fixing bracket 60 is attached to the holder body 20. The assembly of the tool holder unit 10 is finished.

  Next, attachment / detachment of the tool tool 70 with respect to the tool holder unit 10 will be described. When the tool tool 70 is inserted into the tool holder unit 10, the tip of the pull stud 74 comes into contact with the protruding portion of each hard sphere 46. Then, by pushing the tool tool 70 with a predetermined force, the rigid ball 46 is pushed by the tip side inclined portion 74 a of the pull stud 74, and the rigid ball 46 is engaged with the annular engagement groove 74 b of the pull stud 74. Become. As a result, the tool tool 70 is held in the tool holder unit 10. In this case, as described above, the inner diameter L2 of the stepped portion 22 is larger than the inner diameter L3 of the ball retaining ring 40. Further, the inner diameter L2 of the stepped portion 22 is larger than the outer diameter L6 of the proximal end portion 74c of the pull stud 74, and the inner diameter L3 of the ball retaining ring 40 is smaller than the outer diameter L6 of the proximal end portion 74c. Furthermore, the length dimension in the axial direction of the stepped portion 22 is smaller than the length dimension in the axial direction of the base end portion 74c. Therefore, even if the tool tool 70 is vigorously inserted into the tool holder unit 10, the base end portion 74 c of the pull stud 74 hits the end face of the ball retaining ring 40, and further movement in the insertion direction is restricted. Moreover, since the ball retaining ring 40 is made of hard metal as described above, the ball retaining ring 40 is not easily damaged even if it hits the base end portion 74c. Furthermore, as described above, since the movement of the ball retaining ring 40 in the removing direction is firmly restricted by the ring holding metal fitting 50, the ball retaining ring 40 does not come off even if the base end portion 74c hits.

  On the other hand, when removing the tool tool 70 from the tool holder unit 10, the rigid ball 46 is pushed by the base end side inclined portion 74 d of the pull stud 74 and is disengaged by pulling out the tool tool 70 with a predetermined force. Thereby, the tool tool 70 can be removed.

  Next, a description will be given of a tool magazine provided with a plurality of the tool holder units 10 described above and for waiting a plurality of tool tools.

  The tool magazine is provided in a machine tool that processes a workpiece using various tools such as a slice cutter and a drill attached to the spindle, and the tool tool 70 that is on standby is connected to the spindle by an automatic tool changer. Automatically replaced. The tool magazine includes a magazine body and a rotating drum supported on the magazine body. The rotating drum has a disk shape and can be rotated about the center of the magazine body as an axis. The magazine body is provided with a series of cam grooves on its outer periphery. In this configuration, a plurality of tool holder units 10 are arranged at equal intervals along the outer periphery of the tool magazine. In each tool holder unit 10, the fixing bracket 60 is fixed to the rotating drum, and the roller cam 57 is engaged with the cam groove. Therefore, each tool holder unit 10 moves along the shape of the cam groove when the rotating drum rotates in a predetermined direction.

  In this case, the cam groove is twisted at the tool change position, and the rotation position of the tool holder unit 10 is changed between the tool change position and other positions. As a result, when the tool tool 70 is automatically changed, the rotation position of the tool holder unit 10 can be set in a direction in which the replacement work can be performed smoothly. The rotational position of the tool holder unit 10 can be set.

  As described above in detail, the present embodiment has the following excellent effects.

  A hard metal ball retaining ring 40 is attached to the holder body 20 made of synthetic resin, and the tool tool 70 is engaged so as to protrude from the second through hole 41 to the inner peripheral side of the ball retaining ring 40. A hard sphere 46 was provided. Thereby, when the tool tool 70 is attached and detached, the force accompanying the displacement of the rigid sphere 46 is directly applied to the hard metal ball retaining ring 40 and is not directly applied to the synthetic resin holder main body 20. Therefore, when the tool tool 70 is attached or detached, it is possible to prevent the tool holder unit 10 from being damaged such as a crack. In particular, since the holder main body 20 is formed of a thermoplastic resin, damage is likely to occur if a force accompanying the displacement of the rigid sphere 46 is directly applied to the holder main body 20, but the occurrence of such damage can be suppressed.

  Incidentally, by forming the holder main body 20 from a thermoplastic resin, even when the tool holder unit 10 is dropped when transporting the tool holder unit 10 at the time of shipment or the like, the holder main body 20 is affected by the impact at the time of dropping. 20 can be prevented from being cracked. That is, the synthetic resin includes a thermosetting resin and a thermoplastic resin, but the thermoplastic resin is more elastic and easily absorbs an impact. Moreover, it becomes easy to absorb the stress at the time of attachment / detachment of a tool tool.

  In addition, since the ball retaining ring 40 in which each second through hole 41 is formed is attached to the holder main body 20 in which each first through hole 26 is formed, a structure of a mold for molding the holder main body 20 is obtained. Complicating can be suppressed. This is because, for example, in a configuration where so-called insert molding is performed, the structure of a mold for molding the holder body 20 is complicated. Accordingly, in the configuration in which the hard metal ball retaining ring 40 is attached to the synthetic resin holder body 20, the manufacturing cost can be reduced.

  Moreover, it can suppress that the formation operation | work of the 1st, 2nd through-holes 26 and 41 becomes complicated. That is, according to this configuration, the first through hole 26 can be formed in the holder body 20 having a relatively large size when the holder body 20 is molded by the mold. Accordingly, in the configuration in which the hard metal ball retaining ring 40 is attached to the synthetic resin holder body 20, the manufacturing cost can be reduced.

  In the above configuration, the key 27 is provided on the inner wall of the ring receiving hole 24, and the key groove 42 is provided on the outer wall of the ball retaining ring 40. Accordingly, when the ball retaining ring 40 is accommodated in the ring accommodation hole 24, the first through holes 26 and the second through holes 41 are automatically communicated with each other. Therefore, even if the formation of the first through holes 26 of the holder main body 20 and the formation of the second through holes 41 of the ball retaining ring 40 are performed separately, they can be easily aligned. Then, by facilitating the alignment of the first and second through holes 26 and 41, the manufacturing efficiency of the tool holder unit 10 can be increased and the manufacturing cost can be reduced.

  Further, since all the tool holder units provided in the tool magazine are the tool holder units 10, it is possible to reduce the manufacturing costs of the tool magazines as the manufacturing costs of the tool holder units 10 are reduced. .

  Since it is only necessary to provide the key 27 on the inner wall of the ring receiving hole 24 and the key groove 42 on the outer wall of the ball retaining ring 40, it is possible to easily align the two with a simple configuration. In particular, in this embodiment, since the ball retaining ring 40 is substantially cylindrical, this configuration is indispensable in order to facilitate the alignment of the first and second through holes 26 and 41. It can be said that.

  In the configuration in which the movement of the ball retaining ring 40 in the removing direction is restricted by the ring holding metal fitting 50 having an L-shaped cross section, the first fixing plate 51 of the ring holding metal fitting 50 is attached to the cylindrical housing portion 21 by three bolts 53. The second fixing plate 52 was fixed in a state of being in contact with the fixed wall portion 31 with a hexagon socket head bolt 54 while being fixed in a state of being in contact with the end portion on the ring accommodating hole 24 side. By fixing the second fixing plate 52, the fixing direction of the ring holding metal fitting 50 with respect to the holder main body 20 exists in a direction orthogonal to the attaching direction of the tool tool 70. Further, a roller cam 57 is attached to the hexagon socket bolt 54, and the roller cam 57 is engaged with a cam groove of the tool magazine. When attaching the tool tool 70 to the tool holder unit 10, a large load is generally applied to ensure the attachment. In this situation, with the above-described configuration, the load applied to the ball retaining ring 40 when the tool tool 70 is attached is such that the fixed portion of the first fixed plate 51 (three bolts 53) and the fixed portion of the second fixed plate 52 are fixed. (Hexagon socket head cap bolt 54) and the meshing location of the roller cam 57 and the cam groove. In particular, since the cam groove needs to support the tool holder unit 10 together with the rotating portion and is formed firmly, receiving the load at the location is effective. Therefore, even when a large load is applied to the ball retaining ring 40 in the removing direction when the tool tool 70 is attached, the ball retaining ring 40 can be reliably prevented from coming out.

  The inner diameter L3 of the ball retaining ring 40 is made smaller than the inner diameter L2 of the stepped portion 22 and the outer diameter L6 of the base end portion 74c of the pull stud 74 in the tool tool 70 attached to the tool holder unit 10, and the inner diameter L2 of the stepped portion 22 is reduced. It is larger than the outer diameter L6 of the base end portion 74c, and the length dimension in the axial direction of the stepped portion 22 is made smaller than the length dimension in the axial direction of the base end portion 74c. As a result, even if the tool tool 70 is vigorously inserted into the tool holder unit 10, the base end portion 74 c of the pull stud 74 hits the end face of the ball retaining ring 40, and further movement in the insertion direction is restricted. In this case, since the ball retaining ring 40 is made of a hard metal, even if it hits the base end portion 74c, it is difficult to break. Further, as described above, since the movement of the ball retaining ring 40 in the removing direction is firmly restricted by the ring holding metal fitting 50, the ball retaining ring 40 does not come out even if the proximal end portion 74c hits.

  The roller cam 57 for moving along the cam groove of the tool magazine is attached to a hexagon socket head cap screw 54 for fixing the second fixing plate 52 to the fixed wall portion 31. Accordingly, it is not necessary to separately provide a fixing tool for attaching the roller cam 57, and the roller cam 57 is attached in accordance with fixing the second fixing plate 52 to the holder body 20. Therefore, it is possible to reduce the number of parts and the number of manufacturing steps of the tool holder unit 10.

  The embodiment is not limited to the above contents, and may be implemented as follows, for example.

  In the above embodiment, the key 27 is provided in the ring receiving hole 24 and the key groove 42 is provided in the ball retaining ring 40, so that the first and second through holes 26 and 41 are aligned. The configuration for performing the alignment may be changed as shown in FIG. In this configuration, the cross-sectional shape of the ring receiving hole 24 and the cross-sectional shape of the ball retaining ring 40 are not circular as a whole, but are partially rectangular. That is, a square wall portion 91 is formed in the ring receiving hole 24, and a square portion 92 is formed in the ball retaining ring 40 so as to correspond to the square wall portion 91 of the ring receiving hole 24. Thus, by accommodating the ball retaining ring 40 so that the square wall portion 91 and the square portion 92 are aligned, the first and second through holes 26 and 41 are automatically in communication with each other. The second through holes 26 and 41 can be easily aligned. In addition to this configuration, for example, the cross-sectional shape of the ring receiving hole 24 and the cross-sectional shape of the ball retaining ring 40 may be configured such that the entire shape is a square shape or an elliptical shape. Conceivable. Even if it is these structures, the position alignment of each 1st, 2nd through-holes 26 and 41 can be performed easily similarly.

  The configuration relating to holding of the tool tool 70 in the tool holder unit 10 may be changed as shown in FIG. In this configuration, four first through holes 26 and four second through holes 41 are formed, and each second through hole 41 is provided with a plunger 95 as an engaging member instead of the rigid ball 46. . And the front-end | tip of each plunger 95 protrudes to the inner peripheral side of the ball retaining ring 40 by being urged | biased by the compression spring 47 provided in each 1st, 2nd through-hole 26,41 connected. In this case, each plunger 95 has a substantially cylindrical shape as a whole, but the base end portion 95a has a large diameter and is provided with a step. Correspondingly, each second through hole 41 has a small diameter on the inner opening side and is provided with a step wall portion 41a. And since the base end part 95a of each plunger 95 is contact | abutting to the level | step difference wall part 41a of each 2nd through-hole 41, it is prevented that each plunger 95 slips out from each 2nd through-hole 41. FIG. Further, the thickness dimension of the ball retaining ring 40 is larger than the length dimension of the plunger 95, and the plunger 95 is not located in the first through hole 26. When the tool tool 70 is inserted into the tool holder unit 10 having the above configuration, the tip of the pull stud 74 comes into contact with the tip of each plunger 95. Then, by pushing the tool tool 70 with a predetermined force, the plunger 95 is pushed by the tip side inclined portion 74 a of the pull stud 74, and the plunger 95 is engaged with the annular engagement groove 74 b of the pull stud 74. Become. In this case, according to this configuration, since the four plungers 95 are engaged with the engagement groove 74b, the number of engagement portions is increased as compared with the above embodiment, and the tool tool 70 can be held more firmly.

  The number of the first through holes 26 and the second through holes 41 is not limited to three or four, but may be two or five. Moreover, the combination of the number of the 1st through-holes 26 and 41 and the kind of engaging member provided in the 2nd through-hole 41 is arbitrary, and each of the 1st through-hole 26 and the 2nd through-hole 41 is set to 4 each. It is good also as a structure which forms one by one and provides the hard ball 46 as an engagement member in each 2nd through-hole 41.

  In the above embodiment, the key 27 and the key groove 42 are formed over the entire axial direction of the ring receiving hole 24 and the ball retaining ring 40, but this may be changed. For example, the key 27 is formed from the end on the stepped portion 22 side in the ring receiving hole 24 to the middle position in the axial direction, and the key groove 42 is made to correspond to the length of the key 27 from one end of the ball retaining ring 40. Form. By adopting this configuration, the orientation of the front and back of the ball retaining ring 40 when being accommodated in the ring accommodating hole 24 is uniquely determined, so that the work of accommodating the ball retaining ring 40 can be facilitated.

  In the above embodiment, the key 27 is provided in the ring receiving hole 24 and the key groove 42 is provided in the ball retaining ring 40. However, the key may be provided in the ball retaining ring 40 and the key groove may be provided in the ring receiving hole 24. .

  In the said embodiment, although the holder main body 20 was formed with the thermoplastic resin, you may form with thermosetting resins, such as a phenol resin.

  In the above embodiment, each second through hole 41 is formed at a position biased to the end of the stepped portion 22 side of the ball retaining ring 40, but each second through hole 41 is centered in the height direction of the ball retaining ring 40. You may form in a position. As in the above embodiment, the key 27 and the key groove 42 are provided on the symmetry axis SL of the first and second through holes 26 and 41. By adopting this configuration, the first and second through holes 26 and 41 are in communication with each other regardless of which of the both end faces of the ball retaining ring 40 is accommodated in the ring accommodating hole 24 toward the stepped portion 22. . Therefore, the accommodation work of the ball retaining ring 40 can be facilitated.

  In the above embodiment, the movement of the ball retaining ring 40 in the removal direction is regulated by the ring holding metal fitting 50 having an L-shaped cross section, but this may be changed. For example, the movement in the removing direction of the ball retaining ring 40 may be restricted by providing a flat movement restricting fitting. Further, a flange may be formed at one end of the ball retaining ring 40 and the flange may be fixed to the end of the cylindrical housing 21 on the ring housing hole 24 side.

  In the above embodiment, the second fixed plate 52 to which the roller cam 57 is attached extends in a direction substantially orthogonal to the first fixed plate 51, but the second fixed plate 52 is relative to the first fixed plate 51. It is good also as a structure extended straight.

  In the embodiment described above, the ring holding metal fitting 50 is formed of a steel plate, but the ring holding metal fitting 50 may be formed of other types of hard metal such as copper.

  The configuration of the tool magazine in which a plurality of tool holder units 10 are arranged is not limited to the configuration in the above embodiment and is arbitrary. For example, a tool magazine having a configuration in which an annular conveying member such as a chain or a belt is provided instead of a rotating drum, and a plurality of tool holder units 10 are arranged on the conveying member. More specifically, a driving roller and a driven roller are rotatably supported on the tool magazine, and a conveying member is stretched around the driving roller and the driven roller. In this configuration, each tool holder unit 10 is moved by rotation of the conveying member as the driving roller is driven.

  Further, each tool holder unit 10 may not be provided with the roller cam 57, and each tool holder unit 10 may be a tool magazine having a configuration in which it cannot rotate. Moreover, the tool magazine of the structure by which each tool holder unit 10 is being fixed so that it cannot move in a predetermined position may be sufficient. In such a non-moving configuration, the automatic tool changer moves to the position of the tool holder unit 10 where the desired tool tool 70 is held when the tool tool 70 is automatically changed. In the above configuration, the configuration of the ring holding bracket 50 may be changed from that in the above embodiment, and each tool holder unit 10 may be attached to the tool magazine via the ring holding bracket. In such a case, since the load applied to the ball retaining ring 40 when the tool tool 70 is attached is received by the tool magazine via the ring holding fitting, the ball retaining ring 40 can be effectively prevented from coming off.

The disassembled perspective view of a tool holder unit. The top view of a tool holder unit. AA line sectional view of FIG. BB sectional drawing of FIG. The cross-sectional view which shows another example of a tool holder unit. The cross-sectional view which shows another example of a tool holder unit. Explanatory drawing for demonstrating a subject.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Tool holder unit, 20 ... Holder main body, 21 ... Cylindrical accommodation part, 22 ... Step part as a bottom part, 23 ... Shank accommodation hole, 24 ... Ring accommodation hole, 24a ... End opening, 26 ... 1st through-hole, 27: Key constituting the rotational positioning structure, 31: Fixed wall portion, 40: Ball retaining ring, 41: Second through hole, 42: Key groove constituting the rotational positioning structure, 46: Hard sphere as an engaging member, 47 DESCRIPTION OF SYMBOLS ... Compression spring as urging member, 50 ... Ring holding metal fitting as movement restricting metal fitting, 51 ... First fixing plate as first wall portion, 52 ... Second fixing plate as second wall portion, 54 ... Support shaft Hexagon socket head cap screw, 57 ... Roller cam, 60 ... Fixing bracket as holder support member, 61 ... Fixing part, 70 ... Tool tool, 71 ... Shank part, 72 ... Gripping part, 73 ... Taper part, 74 ... Pull stud 74b Engaging groove, 95 ... plunger as an engaging member.

Claims (7)

It has a cylindrical shape and has a holder for accommodating the base end side of a tool tool with a tool attached to the tip.
The holder has a plurality of through-holes extending in a direction orthogonal to the axial direction on the base end side and penetrating inward and outward, and urged by the urging member and the urging member in each of the through-holes. A hard metal engaging member that partially protrudes on the inner peripheral side of the holder and engages with an engaging groove formed in the tool tool,
In the tool holder unit that detachably holds the tool tool by the engagement of these engaging members,
The holder is housed at a position where the through hole is formed by inserting from a base end side of the holder body made of synthetic resin, and the inner peripheral side of the holder at the housed position. Comprising a ring made of hard metal and a movement restricting bracket fixed to the holder body so as to abut against the end surface on the side opposite to the insertion direction of the ring,
Forming a main body side through hole in the holder main body and forming a ring side through hole in the ring;
A tool holder unit comprising a rotary positioning structure for the holder main body and the ring, wherein the through hole is formed by communicating the main body side through hole and the ring side through hole. Forming the ring in an annular shape;
2. The tool holder unit according to claim 1, wherein the rotational positioning structure includes a key formed on one of the holder main body and the ring and a key groove formed on the other.   The tool holder unit according to claim 1, wherein the holder main body is formed of a thermoplastic resin.   The movement restricting bracket is made of a steel plate, and is bent to form a first wall portion fixed to the holder main body so as to be in contact with the end surface on the side opposite to the insertion direction of the ring. A second wall portion extending in a direction substantially orthogonal to the portion is provided, and the second wall portion is fixed to a side wall of the holder main body. Tool holder unit.   The tool holder unit according to any one of claims 1 to 4, wherein a connection means for a tool magazine in which a plurality of the tool holder units are installed is provided in the movement restricting metal fitting.   On the inner peripheral side of the holder body, a restricting portion that is in contact with the insertion side end surface of the ring excluding a predetermined range from the inner diameter position of the ring is provided, and the ring is formed by the restricting portion and the movement restricting metal fitting. The tool holder unit according to any one of claims 1 to 5, wherein the tool holder unit is clamped. A tool magazine comprising a plurality of tool holder units and waiting for a tool tool to be attached to a spindle of a machine tool by holding the tool tool in each tool holder unit,
A tool magazine characterized in that each tool holder unit is the tool holder unit according to any one of claims 1 to 6.

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