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WO2019244664A1 - Mandrin comprenant une fonction d'étirage - Google Patents

Mandrin comprenant une fonction d'étirage Download PDF

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Publication number
WO2019244664A1
WO2019244664A1 PCT/JP2019/022646 JP2019022646W WO2019244664A1 WO 2019244664 A1 WO2019244664 A1 WO 2019244664A1 JP 2019022646 W JP2019022646 W JP 2019022646W WO 2019244664 A1 WO2019244664 A1 WO 2019244664A1
Authority
WO
WIPO (PCT)
Prior art keywords
chuck
support
screw
block
hole
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2019/022646
Other languages
English (en)
Japanese (ja)
Inventor
民和 西宮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kitagawa Corp
Original Assignee
Kitagawa Iron Works Co Ltd
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 Kitagawa Iron Works Co Ltd filed Critical Kitagawa Iron Works Co Ltd
Priority to JP2020525511A priority Critical patent/JP7288441B2/ja
Publication of WO2019244664A1 publication Critical patent/WO2019244664A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B23B31/16—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving radially
    • B23B31/16233—Jaws movement actuated by oblique surfaces of a coaxial control rod
    • B23B31/16266—Jaws movement actuated by oblique surfaces of a coaxial control rod using mechanical transmission through the spindle
    • 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
    • B23B2231/14—Chucks with clamping force limitation means

Definitions

  • the disclosed technology relates to a chuck with a pull-in function used for a machine tool.
  • Patent Document 1 A chuck with a pull-in function is disclosed in Patent Document 1.
  • a form particularly related to the disclosed technology is disclosed in the third embodiment (FIGS. 7 to 11).
  • a top jaw for gripping a work is fixed to a master jaw, and the master jaw is connected to a plunger displaced in an axial direction. Since the plunger is pulled by a strong force, a large force of several tons acts on the chuck at the moment of gripping the work.
  • the pull-in function is a function that can suppress such a problem.
  • the purpose of the technology disclosed therein is to provide a chuck with a pull-in function, which makes it possible to easily adjust the pull-in function according to use conditions.
  • a chuck having a pull-in function for pulling in a work after gripping the work, the chuck body rotating around a rotation axis during use, and a chuck body disposed inside the chuck body.
  • a plunger that slides in a direction in which the rotating shaft extends, and a plurality of master jaws that slide inside the chuck body in a radial direction perpendicular to the rotating shaft in conjunction with the sliding of the plunger;
  • a plurality of top jaws fixed to each of the master jaws so as to slide along the front surface of the chuck body, wherein the plunger slides rearward to grip a workpiece.
  • a rear cover for covering a rear side of the body, and the master cover is provided inside the rear cover;
  • each of the retraction mechanisms includes an elastically deformable support plate for receiving a rear end of the master jaw; and the support plate.
  • a pair of support portions that support a distant position of the support plate so that a gap is formed at a position facing the rear end of the master jaw, and one of the support portions is A chuck is provided, the chuck comprising a movable support block.
  • one of the support portions is constituted by the movable support block, the distance between the pair of support portions can be changed by moving the support block, and thereby, the support plate can be moved. It is possible to adjust the retraction function without replacing the.
  • each of the retraction mechanisms includes a recess formed inside the rear cover so as to face a rear end of the master jaw, and the support plate includes the recess.
  • the support block is a chuck housed in the recess.
  • each of the master jaws has a regulating protrusion protruding rearward at the rear end, and the support plate is a chuck that receives the regulating protrusion.
  • each of the support plates is formed to extend in a radial direction, and a position of the support plate that is separated in a radial direction is supported by each of the support portions, and the support block is provided.
  • a chuck configured to be movable in the radial direction.
  • the support block is arranged radially outside, and the rear cover is provided with a retraction adjustment unit that enables a movement operation of the support block from outside. It is.
  • the pull-in adjustment unit includes a through-hole formed in an outer peripheral surface of the rear cover, a block screw hole formed in the support block so as to overlap the through-hole, and the through-hole.
  • the pull-in adjustment portion is further screwed into the cover screw hole formed on the outer peripheral surface of the rear cover adjacent to the through-hole, and a tip of the cover screw hole is formed.
  • a positioning screw contacting the support block.
  • the pull-in adjustment unit includes a second block screw hole formed in the support block so as to extend in a radial direction, and the second block in a state where movement in the screwing direction is restricted.
  • the pull-in adjusting portion further includes a second block screw hole formed in the support block in parallel with the block screw hole, and the movement in the screwing direction is restricted.
  • FIG. 2 is a schematic sectional view taken along line II-II in FIG. 1.
  • A is the schematic which disassembled the chuck main body and the front cover of the chuck body, and looked from diagonally backward.
  • FIG. 2B is a schematic view of the chuck body and the rear cover of the chuck body disassembled and viewed obliquely from the front.
  • FIG. 3 is a diagram corresponding to FIG. 2, showing a state when a workpiece is gripped.
  • FIG. 3 is a diagram corresponding to FIG. 2, showing a state when a workpiece is gripped.
  • FIG. 6 is a schematic cross-sectional view taken along the line VI-VI in FIG. 2, and is a schematic view showing an exploded structure of a retraction mechanism. It is the schematic which shows the structure of a retraction adjustment part.
  • A is the figure which looked at the structure from the radial outside
  • (b) is the figure which looked at the structure from the axial front.
  • FIG. 7 shows the structure of the retraction adjustment part of another form.
  • FIG. 1 shows a chuck with a pull-in function (also simply referred to as chuck 1) according to a first embodiment of the present invention.
  • the chuck 1 is used by being attached to the machine tool 2 when processing the work W.
  • the chuck 1 includes a chuck body 10 having a thick disk shape in appearance, and a rear portion thereof is attached to the spindle 2 a of the machine tool 2. During processing, the chuck 1 is driven to rotate about a rotation axis J extending in the front-rear direction together with the spindle 2a.
  • top jaws 3 are radially arranged on the front surface of the chuck body 10, and these top jaws 3 are arranged in the radial direction (the rotation axis J) along the front surface of the chuck body 10. (In the direction perpendicular to the direction). By doing so, the work W is gripped or released.
  • the work W when the work W is inserted into the center of the front surface of the chuck body 10 and the top jaw 3 is slid toward the center, the work W is aligned with the rotation axis J with high accuracy. Is firmly gripped.
  • the work W is gripped from the outside, but the work W can be gripped from the inside by reversing the direction of the top jaw 3 and the like.
  • FIG. 2 shows the internal structure of the chuck 1.
  • the chuck 1 is composed of members such as a plunger 20, a bush 30, and a master jaw 40 in addition to the chuck body 10 and the top jaw 3.
  • the chuck 1 is provided with a retraction mechanism 60 for performing the retraction function, a retraction adjustment unit 70 for adjusting the retraction function, such as the concave portion 61 and the support plate 62, which will be described later. .
  • the chuck body 10 is attached to a front surface of the body main body 11 so as to cover a thick disk-shaped body main body 11 and a front side of the body main body 11. And a disc-shaped rear cover 13 mounted on the rear surface of the body 11 so as to cover the rear side of the body 11.
  • the main housing 11 has a main housing hole 14 and a sub housing hole 15 formed so as to be recessed from the rear side of the body main body 11 toward the front.
  • the main housing hole 14 is a hole having a circular cross section formed in the center portion of the body 11 so as to extend in the axial direction (the direction in which the rotation axis J extends), and houses the plunger 20.
  • the sub-accommodation holes 15 are a plurality of circular holes formed around the main accommodation hole 14 so as to partially overlap the main accommodation hole 14 in accordance with the number and arrangement of the top jaws 3.
  • the master jaw 40 and the bush 30 are housed.
  • the sub-accommodation hole 15 is different from the main accommodation hole 14 and penetrates the body main body 11.
  • a plurality of radially extending substantially rectangular slide recesses 16 are radially formed on the front surface of the body main body 11 so as to overlap with the respective sub-accommodation holes 15 (actually, only four corners of the slide recess 16 are apparent). ).
  • a small-diameter shaft insertion hole 11a is formed at the center of the bottom of the main housing hole 14 so as to penetrate the front surface of the body main body 11.
  • a mounting bolt hole 11b through which a mounting bolt B1 (a bolt for fastening to the spindle 2a) is inserted, and a cover bolt B2 (a front cover 12).
  • a cover bolt hole 11c to which a bolt for fastening the rear cover 13 is fastened.
  • a plurality of radially extending rectangular slide openings 17 are formed radially inside the front cover 12 (rear surface) so as to face the respective slide recesses 16.
  • the slide opening 17 is formed one size smaller than the slide recess 16, and a slide groove 18 overlapping the slide recess 16 is formed around the slide opening 17 inside the front cover 12.
  • the front cover 12 is further formed with a front shaft insertion hole 12a overlapping the shaft insertion hole 11a, a front mounting bolt hole 12b overlapping the mounting bolt hole 11b, a front cover bolt hole 12c overlapping the cover bolt hole 11c, and the like. .
  • a plurality of radially extending rectangular recesses 61 are radially formed in correspondence with the number and arrangement of the sub-accommodation holes 15 (details of the recesses 61 are described below). See below).
  • a rear shaft insertion hole 13a penetrating the rear cover 13 is formed.
  • the rear cover 13 is further provided with a rear mounting bolt hole 13b overlapping the mounting bolt hole 11b, a rear cover bolt hole 13c overlapping the cover bolt hole 11c, and the like.
  • the chuck body 10 is configured by attaching the front cover 12 and the rear cover 13 to the body main body 11 by fastening with cover bolts B2.
  • a plunger 20, a bush 30, a master jaw 40 and the like are arranged inside the chuck body 10.
  • the plunger 20 As shown in FIGS. 2 and 4, the plunger 20 has a plunger main body 21 and a connection plate 22.
  • the plunger body 21 is rotatably supported by being inserted into the front shaft insertion hole 12a and the shaft insertion hole 11a and rotatably supported by the front shaft portion 21a, and being inserted through the rear shaft insertion hole 13a.
  • the rear shaft portion 21b and the main shaft portion 21c provided therebetween and fitted into the main housing hole 14 are integrally formed.
  • the main shaft portion 21c is formed with a bush support surface 23 having an arc-shaped cross section that faces each of the sub-housing holes 15 and is continuous with the sub-housing holes 15.
  • a drawbar connection hole 24 to which the drawbar 2b of the machine tool 2 is connected is formed at the rear end of the rear shaft 21b.
  • connection plate 22 is a plate-like member having substantially the same outer edge shape as the front surface of the main shaft portion 21c, and is fixed to the front surface of the main shaft portion 21c with bolts B3.
  • the connection plate 22 has an engagement edge 25 slightly projecting radially outward from the bush support surface 23 of the main shaft 21c.
  • the size of the connecting plate 22 and the main shaft portion 21c in the front-rear direction is smaller than that of the main housing hole 14, so that the plunger 20 can slide in the chuck body 10 in the front-rear direction. ing.
  • the bush 30 is a substantially cylindrical member, and is fitted in each sub-accommodation hole 15.
  • the size of the bush 30 in the front-rear direction is smaller than that of the sub-accommodating hole 15, and the bush 30 is slidable in the front-rear direction inside the chuck body 10.
  • the hole inside the bush 30 (wedge hole 31) is inclined at a predetermined inclination angle with respect to its center line (parallel to the rotation axis J).
  • an annular engagement groove 32 is formed over the entire circumference.
  • Each bush 30 slides in the front-rear direction inside the chuck body 10 in conjunction with the plunger 20 by fitting the engagement edge 25 into the engagement groove 32.
  • the plunger 20 is connected to the master jaw 40 via these bushes 30.
  • the master jaw 40 is integrally formed with a base portion 40a, a flange portion 40b, a wedge portion 40c, and the like.
  • the base portion 40a is formed in a substantially rectangular parallelepiped shape which is slightly smaller than the slide opening 17 and one of which is longer.
  • the base portion 40a is disposed so as to extend in the radial direction with respect to the chuck body 10, and its front portion is exposed to the front of the chuck body 10 through the slide opening 17.
  • a fixing bolt hole 41 is formed in a front portion of the base portion 40a, and the top jaw 3 is detachably fixed to the base portion 40a by fastening a bolt B4 to the fixing bolt hole 41.
  • Flange portion 40b is a rectangular plate-shaped portion that vertically projects from the rear side of base portion 40a, and is fitted into slide recess 16.
  • the size in the radial direction is smaller in the flange portion 40b than in the slide concave portion 16, and the master jaw 40 can slide in the chuck body 10 in the radial direction.
  • the size of the slide groove 18 in the width direction is smaller than that of the slide recess 16, and the side edge portions on both sides of the flange portion 40 b are formed on the inner surface of the front cover 12. Proximity or contact. Thereby, the master jaw 40 is restricted from being displaced forward by the front cover 12.
  • a rectangular frame-shaped seal frame 42 is mounted on the front side of the base portion 40a so as to fit into the slide groove 18.
  • a sealing material 42a is attached to the front and rear surfaces of the seal frame 42, and the gap between the slide opening 17 and the sub-accommodation hole 15 is sealed by such a seal frame 42.
  • the wedge portion 40c is a portion connected to the rear side of the base portion 40a and has a substantially columnar shape.
  • the wedge portion 40c extends obliquely in the radial direction at the same inclination angle as the wedge hole 31 with respect to the flange portion 40b, and is fitted into the wedge hole 31.
  • a restricting convex portion 43 for performing a retracting function is provided at the rear end of the wedge portion 40c.
  • the restricting projection 43 is located at a corner of the rear end of the wedge 40c in the radial direction, on the side away from the flange 40b due to the inclination of the wedge 40c.
  • the regulating protrusion 43 is at the corner of the wedge portion 40c, it is located at substantially the center in the radial direction with respect to the base portion 40a.
  • the restricting projection 43 has an arcuate shape elongated in the width direction, and protrudes rearward from the rear end of the wedge 40c.
  • the restricting convex portion 43 is in a state of being contacted and received by the support plate 62 disposed on the rear cover 13. Thereby, the rear displacement of the master jaw 40 is restricted by the rear cover 13.
  • FIG. 2 shows a state in which the top jaw 3 is located most outward in the radial direction. Therefore, when the draw bar 2b is pulled backward from this state, the plunger 20 slides backward. In conjunction with the slide of the plunger 20, each bush 30 also slides backward. Conversely, when the drawbar 2b is pushed forward, the plunger 20 and each bush 30 slide forward.
  • each master jaw 40 is restricted in displacement in the front-rear direction by the flange portion 40b and the restricting convex portion 43, the slant fitting (so-called wedge action) between the wedge hole 31 and the wedge portion 40c causes The plunger 20 slides in the radial direction in conjunction with the sliding of the plunger 20 in the axial direction.
  • each master jaw 40 slides radially inward (center side). Since each top jaw 3 is fixed to each master jaw 40, the top jaw 3 slides radially inward along the front surface of the chuck body 10 together with the master jaw 40.
  • the chuck 1 since the chuck 1 is provided with a drawing function, the chuck 1 works so as to pull in the work W after gripping the work W. Therefore, the tip of the work W can be abutted against the front surface of the chuck body 10 to accurately position the work W in the axial direction.
  • each top jaw 3 receives the strong reaction force from the work W while strongly gripping the work W. Due to the reaction force, the master jaw 40 and the top jaw 3 are elastically deformed, and the work W may rise. Although the size of the lift is slight (for example, a level of several tens of ⁇ m to several hundreds of ⁇ m), such a lift deteriorates the gripping accuracy of the work W and adversely affects the processing accuracy.
  • the pull-in function is for suppressing the lifting of the work W.
  • a plurality of retraction mechanisms 60 are provided inside the rear cover 13.
  • the retraction mechanism 60 includes a recess 61, a support plate 62, a fixed support 63 (support), a support block 64 (support), and the like. It is provided in.
  • the recess 61 is formed in the rear cover 13 (specifically, a flat front surface of the rear cover 13) so as to extend in the radial direction. It is provided at a position facing the unit.
  • the concave portion 61 three regions including a first region 61a, a second region 61b, and a third region 61c having a flat bottom surface and different depths are formed.
  • the semicircular dents observed at various places of the concave portion 61 are processing traces of the end mill used when forming the concave portion 61.
  • the first region 61a is the shallowest region, and is formed inside the concave portion 61 in the radial direction.
  • the first region 61a is formed so as to extend in a band along the edge of the end of the concave portion 61.
  • the third region 61c is the deepest region and is formed largely outside the concave portion 61 in the radial direction.
  • the second region 61b is a region slightly deeper and wider than the first region 61a, and is formed in a belt shape between the first region 61a and the third region 61c.
  • the fixed support 63 is provided inside the recess 61 in the radial direction.
  • the fixed support portion 63 includes a first region 61a and a second region 61b.
  • the support block 64 is formed of a prism-shaped member formed in substantially the same shape as the fixed support portion 63. On the upper surface of the support block 64, a support region 64a extending in the width direction (a region corresponding to the first region 61a) and an unsupported region 64b slightly lower than the support region 64a (a region corresponding to the second region 61b) are provided. Is formed.
  • the support block 64 is accommodated in the third region 61c so as to extend in the width direction with the support region 64a positioned outside in the radial direction.
  • the support area 64a and the first area 61a are designed to face each other in the radial direction with the same height.
  • Both end faces of the support block 64 facing in the width direction are close to or in contact with both side faces of the recess 61 in a slidable manner.
  • the size of the support block 64 in the radial direction is smaller than that of the third region 61c, and the support block 64 can smoothly move in the radial direction inside the third region 61c.
  • the support plate 62 is made of a thin metal plate that facilitates elastic deformation.
  • the support plate 62 is formed in a rectangular shape having one long side, and is fitted into each recess 61 so as to extend in the radial direction.
  • the support plate 62 has substantially the same thickness as the depths of the first region 61a and the support region 64a. When the support plate 62 is fitted in the concave portion 61, the diameter of the support plate 62 is increased by the first region 61a and the support region 64a. The parts separated in the direction are supported.
  • first region 61a and the support region 64a there are a second region 61b and an unsupported region 64b, which are deeper than these, and a third region 61c depending on the position of the support block 64. Therefore, there is always a gap over the entire region below the region between the support plates 62 supported by the first region 61a and the support region 64a so that the support plate 62 can flex and elastically deform. (This area is also called an elastic deformation area).
  • the regulating protrusion 43 is in contact with the front surface (front side) of the support plate 62, and the master jaw 40 is received by the support plate 62.
  • the restricting convex portion 43 is configured to always contact the elastic deformation region.
  • the support block 64 moves inward in the radial direction (a state where the support block 64 abuts on the inner end surface 65 of the third region 61c located at the boundary with the second region 61b), and the master jaw 40 is moved. Even when the radial direction is slid most inward, the restricting convex portion 43 is configured to be located at a substantially intermediate portion of the elastic deformation region.
  • the restricting convex portion 43 is configured to be located at a substantially middle portion of the elastic deformation region. The same applies to the case where the master jaw 40, the top jaw 3, and the bush 30 are reversed and the work W is gripped from the inside.
  • the contact area with the elastic deformation region is small.
  • the restricting projection 43 is located at a substantially middle portion of the elastic deformation region of the support plate 62 supported at a position separated in the radial direction. Therefore, since the force acting via the master jaw 40 is collected and received at the flexible portion of the support plate 62, the elasticity of the support plate 62 can be effectively used.
  • the support block 64 supporting one of the support plates 62 is movable in the radial direction. That is, the size of the interval between the support positions of the support plate 62 can be adjusted.
  • the amount of elastic deformation of the support plate 62 varies depending on the size of the interval between the support positions of the support plate 62. Therefore, by adjusting the interval, the pull-in function can be adjusted.
  • the rear cover 13 is provided with a pull-in adjustment unit 70 that enables the support block 64 to be moved from outside so that such a pull-in function can be easily adjusted.
  • the retraction adjustment unit 70 includes a slide screw 71, a positioning screw 72, and the like.
  • a long groove 73 is recessed at a portion radially outside of each recess 61.
  • Two holes are formed adjacent to the bottom surface of the long groove 73.
  • the through hole 74 and the cover screw hole 75 penetrate the rear cover 13 so as to extend in parallel, and communicate with the recess 61.
  • a female screw is formed in the cover screw hole 75, the through hole 74 is formed in a circular cross section without a female screw.
  • a block screw hole 76 is formed in the support block 64 so as to penetrate both side surfaces thereof.
  • the block screw holes 76 are arranged at positions where the center lines of the block screw holes 76 and the through holes 74 coincide with each other.
  • the slide screw 71 has a long shaft portion 71a having a relatively long male screw, and a head 71b rotatable by a tool (a hexagon wrench in this embodiment).
  • the major axis portion 71a has a smaller diameter than the through hole 74, and the head portion 71b has a larger diameter than the through hole 74.
  • Such a slide screw 71 is inserted into the recess 61 through the through hole 74 and screwed into the block screw hole 76.
  • the slide screw 71 extends in the direction in which the support block 64 moves, and the support block 64 covers the entire third region 61c with little resistance when the slide screw 71 is screwed into the block screw hole 76. It is configured to be able to move in the radial direction.
  • the positioning screw 72 is screwed into the cover screw hole 75.
  • the positioning screw 72 has a short shaft portion 72 a having a relatively short male screw, and a head 72 b having a structure similar to that of the slide screw 71 and having a larger diameter than the cover screw hole 75.
  • the positioning screw 72 is mainly used for positioning the support block 64.
  • the positioning screws 72 having different lengths of the short shaft portions 72a are selected and used according to the conditions of use such as the shape and material of the work W. If the slide screw 71 and the positioning screw 72 are pulled out from the rear cover 13, the support block 64 will be free to slide. In this state, the selected positioning screw 72 is screwed into the cover screw hole 75. After that, the support block 64 is moved outward in the radial direction by screwing the slide screw 71 into the block screw hole 76.
  • the support block 64 When the support block 64 abuts on the tip of the positioning screw 72, the movement of the support block 64 is restricted, so that the support block 64 is fixed at that position. Therefore, according to the retraction adjustment unit 70, the support block 64 can be moved from the outside with only a small number of general-purpose members and a simple structure, and the retraction function can be easily adjusted.
  • the position where the slide screw 71 is screwed in and the position where the tip of the positioning screw 72 abuts are arranged to be adjacent on both sides of the center of the support block 64 in the width direction.
  • the positioned support block 64 can be firmly and stably fixed.
  • the number of slide screws 71 is not limited to one, and may be two. In that case, it is preferable to arrange the slide screws 71 on both sides of the positioning screw 72. Further, the number of the positioning screws 72 is not limited to one and may be two. In that case, it is preferable to arrange the positioning screws 72 on both sides of the slide screw 71.
  • Second Embodiment A second embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment, and is different from the first embodiment in that a second retraction adjustment unit 80 is provided instead of the retraction adjustment unit 70. Hereinafter, the differences will be mainly described.
  • a screw shaft 81, a rotation operation unit 82, and the like are provided instead of the positioning screw 72 described above.
  • two holes are formed adjacent to the outer peripheral surface of the rear cover 13 at a position radially outside of each recess 61. I have.
  • the through hole 83 and the insertion hole 84 pass through the rear cover 13 so as to extend in parallel, and communicate with the recess 61.
  • a female screw is formed in the insertion hole 84, but the through hole 83 is formed in a circular cross section without a female screw.
  • the support block 64 is formed with two screw holes including a block screw hole 84 and a second block screw hole 85 so as to pass through both side surfaces in parallel.
  • Each of the block screw hole 84 and the second block screw hole 85 is disposed at a position where the center line of each of the through hole 83 and the insertion hole 84 coincides with each other, and overlaps with the through hole 83 and the insertion hole 84. It is formed as follows.
  • the slide screw 71 is inserted into the recess 61 through the through hole 83 in the block screw hole 84 and screwed into the block screw hole 84, as in the pull-in adjustment unit 70.
  • the screw shaft 81 is formed of a relatively long male screw and is screwed into a second block screw hole 85 extending in the radial direction.
  • the distal end of the screw shaft 81 located radially inward is close to or in contact with the inner end surface 65 of the third region 61c.
  • the rotating operation part 82 is provided integrally on the outside of the screw shaft 81 in the radial direction.
  • the end face of the rotary operation portion 82 is close to or in contact with the outer end face 66 of the third region 61c facing the inner end face 65.
  • a relief groove 86 is formed on the outer end face 66 of the third region 61c so as to be depressed outward in the radial direction, and the rotation operation part 82 is accommodated in the relief groove 86.
  • the end face of the rotary operation portion 82 is close to or in contact with the bottom of the clearance groove 86.
  • a tool hole 82a through which the screw shaft 81 can be rotated by a tool is formed on the end face of the rotation operation part 82.
  • the end face of the rotating operation portion 82 is arranged so as to face the insertion hole 84, and a tool can be inserted into the tool hole 82 a from the outside through the insertion hole 84.
  • the sealing screw 87 is screwed into the insertion hole 84, and the insertion hole 84 is in a closed state.
  • Rotating operation section 82 is configured to be capable of rotating at a constant pitch. That is, a known ratchet mechanism 88 is attached to the rotation operation unit 82, and the screw shaft 81 and the rotation operation unit 82 are rotated around both the forward rotation and the reverse rotation, and the rotation is performed at a predetermined rotation angle. It is constituted so that positioning is possible.
  • the ratchet mechanism 88 is configured such that a recess is formed at one location on the outer peripheral surface of the rotating operation unit 82 and a restricting piece that fits into the recess is pressed against the outer peripheral surface of the rotating operation unit 82 by a spring. You may. Then, every time the rotation operation section 82 makes one rotation, the rotation operation of the rotation operation section 82 is restricted, and the screw shaft 81 and the rotation operation section 82 can be positioned.
  • the second retraction adjustment unit 80 if the slide screw 71 is pulled out from the rear cover 13, the rotation of the rotation operation unit 82 and the screw shaft 81 causes the support block 64 to be slidable. In this state, the sealing screw 87 is removed, and a tool is inserted into the tool hole 82a through the insertion hole 84.
  • the rotation operation unit 82 and the screw shaft 81 are rotated to move the support block 64 to a reference position (for example, a position where the support block 64 contacts the outer end surface 66). Thereafter, the rotation operation unit 82 and the screw shaft 81 are rotated in reverse by the predetermined number of pitches, and the support block 64 is moved to a position where a desired elastic force is obtained.
  • the slide screw 71 is screwed into the block screw hole 84.
  • the support block 64 is fixed in the positioned state. Therefore, according to the second retraction adjusting unit 80, there is no need to replace the positioning screw 72, and the operation of moving the support block 64 from outside can be performed only by operating the tool, and the retraction function can be easily adjusted. .
  • the present invention is not limited to the above-described embodiment, but also includes other various configurations.
  • the direction in which the support block 64 moves is preferably a radial direction, but is not limited thereto.
  • the positioning screw 72, the screw shaft 81, and the like can be changed to another configuration according to specifications.
  • the point is that it is sufficient that the support block 64 can be positioned.
  • a pin that can be fixed to the rear cover 13 is protruded from the rear cover 13 so that the support block 64 can be positioned by adjusting the amount of protrusion of the pin. You may.
  • the slide screw 71 may not be provided.
  • the slide screw 71 becomes unnecessary. If the support block 64 can be positioned by fixing the screw shaft 81 with the sealing screw 87, the slide screw 71 becomes unnecessary in that case as well.
  • the form of the chuck body is an example.
  • the rear cover may be formed integrally with the body main body.
  • the regulating protrusion 43 provided at the rear end of the master jaw 40 is brought into contact with the support plate 62, but the regulating protrusion 43 may not be provided on the master jaw 40.
  • the rear end of the master jaw 40 has, for example, a flat surface, and this flat surface contacts the support plate 62 and is supported by the support plate 62.
  • the recess 61 of the rear cover 13 may not be provided.
  • the support block 64 can be slid by, for example, positioning the support plate using a pin or providing a guide mechanism such as a rail.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

La présente invention concerne un mandrin comprenant une fonction d'étirage qui peut être simplement réglée selon des conditions d'utilisation. Ce mandrin est pourvu d'une fonction d'étirage qui agit de manière à étirer une pièce à travailler après la préhension de la pièce à travailler, le mandrin étant pourvu d'un corps de mandrin, d'un poussoir, d'une pluralité de mâchoires maîtresses et d'une pluralité de mâchoires supérieures, le corps de mandrin présentant un couvercle arrière qui recouvre le côté arrière du corps de mandrin ; une pluralité de pièces de mécanisme d'étirage qui réalisent la fonction d'étirage en coopération avec les mâchoires maîtresses sont disposés à l'intérieur du couvercle arrière ; chacune des pièces de mécanisme d'étirage comprend une plaque de support qui peut être déformée de manière élastique et qui reçoit les sections d'extrémité arrière des mâchoires maîtresses et une paire de pièces de support qui supportent les positions espacées sur la plaque de support de manière à ce qu'un espace soit formé à une position qui est au-dessous de la plaque de support et fait face aux sections d'extrémité arrière des mâchoires maîtresses, l'une des pièces de support étant conçue sous la forme d'un bloc de support mobile.
PCT/JP2019/022646 2018-06-19 2019-06-06 Mandrin comprenant une fonction d'étirage Ceased WO2019244664A1 (fr)

Priority Applications (1)

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JP2020525511A JP7288441B2 (ja) 2018-06-19 2019-06-06 引き込み機能付きチャック

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JP2018-116016 2018-06-19
JP2018116016 2018-06-19

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WO2019244664A1 true WO2019244664A1 (fr) 2019-12-26

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JP (1) JP7288441B2 (fr)
TW (1) TW202000347A (fr)
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003008135A1 (fr) * 2001-07-18 2003-01-30 Kabushiki Kaisha Kitagawa Tekkosho Mandrin dote d'une fonction de traction
WO2010013877A1 (fr) * 2008-07-28 2010-02-04 Samchully Machinery Co., Ltd. Mandrin hydraulique
JP2012121107A (ja) * 2010-12-09 2012-06-28 Teikoku Chuck Kk チャック装置
JP2013212565A (ja) * 2012-04-04 2013-10-17 Howa Mach Ltd 揺動引込み式チャック
JP2015058528A (ja) * 2013-09-20 2015-03-30 株式会社北川鉄工所 引き込みチャック
JP2015058529A (ja) * 2013-09-20 2015-03-30 株式会社北川鉄工所 引き込み機構を持つチャック装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN210632955U (zh) 2019-07-24 2020-05-29 贝斯特精密机械有限公司 前置式回转夹头

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003008135A1 (fr) * 2001-07-18 2003-01-30 Kabushiki Kaisha Kitagawa Tekkosho Mandrin dote d'une fonction de traction
WO2010013877A1 (fr) * 2008-07-28 2010-02-04 Samchully Machinery Co., Ltd. Mandrin hydraulique
JP2012121107A (ja) * 2010-12-09 2012-06-28 Teikoku Chuck Kk チャック装置
JP2013212565A (ja) * 2012-04-04 2013-10-17 Howa Mach Ltd 揺動引込み式チャック
JP2015058528A (ja) * 2013-09-20 2015-03-30 株式会社北川鉄工所 引き込みチャック
JP2015058529A (ja) * 2013-09-20 2015-03-30 株式会社北川鉄工所 引き込み機構を持つチャック装置

Also Published As

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JP7288441B2 (ja) 2023-06-07
TW202000347A (zh) 2020-01-01
JPWO2019244664A1 (ja) 2021-06-24

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