JP2007307668A - Coil spring end part machining machine and coil spring end part machining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil spring end part machining machine which efficiently performs surface grinding and chamfers both end parts of a coil spring, and stabilizes chamfering quality as compared with conventional chamfering quality, and a coil spring end part machining method. <P>SOLUTION: This coil spring end part machining machine 10 performs both of surface grinding and chamfering of both the end parts of the coil spring 90 to improve working efficiency. Since the coil spring 90 is stored in a spring holder 63 and is regulated in moving in all directions orthogonal to an axial direction during the chamfering, the position of the coil spring 90 is stabilized during the chamfering as compared with a conventional coil spring end part machining machine. The coil spring 90 is rotated by grinding resistance force received from a grinding wheel, and thereby deformation of the coil spring 90 is suppressed. As a result, quality of the chamfering is improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coil spring end processing machine and a coil spring end processing method for processing both ends of a coil spring.

In general, after a coil spring is formed from a wire rod, both end portions are subjected to surface grinding by a surface grinder, and further, outer edge portions at both end surfaces are chamfered by a chamfering machine. As such a surface grinding machine, one having a configuration in which a coil spring is passed between end faces of a pair of grinding wheels arranged coaxially is known (for example, see Patent Document 1). In addition, as shown in FIG. 20, the chamfering machine includes a pair of grinding wheels 1 and 1 whose rotational axes are parallel, and a coil spring between the peripheral surfaces 1A and 1A of the grinding wheels 1 and 1. What chamfers while rotating 4 is known. In this chamfering machine, in order to rotate the coil spring 4, a belt conveyor 2, a rolling guide 3 covering the upper side of the belt conveyor 2, and a pair of end surface guides 5 and 5 facing in the horizontal direction are provided. Have. A plurality of coil springs 4 are accommodated in a space surrounded by the belt conveyor 2, the rolling guide 3 and the pair of end surface guides 5, 5, and the coil spring 4 is rotated by operating the belt conveyor 2. It moves between the grinding wheels 1 and 1 while rolling along the moving guide 3. As a result, the outer edge portions of both end surfaces of the coil spring 4 are slidably brought into contact with the peripheral surfaces 1A and 1A of the grinding wheels 1 and 1, and chamfering is performed (for example, see Non-Patent Document 1).
Japanese Patent Laid-Open No. 9-201752 (paragraphs [0014] and [0018], FIGS. 1 and 4) Skill Test Text Revision Committee, “Spring Handbook”, published by Japan Spring Industry Association, April 30, 2005, first edition, pp. 397-398

  However, in the above-described conventional coil spring machining method, both end portions of the coil spring are machined using a separately provided surface grinder and chamfering machine, so that the work efficiency is poor. Further, in the above-described conventional chamfering machine, the coil spring 4 is sandwiched between the belt conveyor 2 and the rolling guide 3 and deformed, and the chamfering quality may become unstable. On the other hand, if the clamping force with respect to the coil spring 4 by the belt conveyor 2 and the rolling guide 3 is reduced, the coil spring 4 escapes in the direction of the rotation axis of the grinding wheels 1 and 1 due to the grinding resistance force, and the chamfering quality is unstable. The problem of becoming.

  The present invention has been made in view of the above circumstances, and can efficiently perform surface grinding and chamfering of both end portions of a coil spring, and can stabilize the quality of chamfering as compared with the prior art. An object is to provide a coil spring end processing machine and a coil spring end processing method.

  In order to achieve the above object, a coil spring end processing machine according to the invention of claim 1 is a coil spring end processing machine for processing both ends of a coil spring, and rotates together with the end faces facing each other. A pair of grinding wheels, a cylindrical spring holder in which a coil spring is inserted inside and whose axial length is shorter than that of the coil spring, and a holder that holds the spring holder and advances and retreats to a region between the grinding wheels between the grinding wheels A moving mechanism, an upright posture in which the axial direction of the spring holder is orthogonal to the end face of the grinding wheel, and both end faces of the coil spring are in contact with the end faces of both grinding wheels, and the axial direction of the spring holder is relative to the end face of the grinding wheel To change the posture of the spring holder to an inclined posture in which the outer edge portions of both end faces of the coil spring are brought into contact with both grinding wheels and the coil spring is rotated in the spring holder by the grinding resistance force from the grinding wheel. Holder posture change mechanism Characterized in place with a.

  According to a second aspect of the present invention, in the coil spring end processing machine according to the first aspect, the holder moving mechanism rotates in one direction, and a plurality of spring holders are attached to the outer edge portion so that the posture can be changed. And is characterized in that a part of the outer edge of the rotary table is arranged in the region between the grinding wheels.

  According to a third aspect of the present invention, in the coil spring end processing machine according to the second aspect, the pair of grinding wheels are arranged coaxially and face each other in the vertical direction, face the rotary table from below and It is characterized in that a fixed table is provided which is flush with the end face of the lower grinding wheel and supports the coil spring in the spring holder from below.

  According to a fourth aspect of the present invention, in the coil spring end portion processing machine according to the third aspect, the fixed table includes a discharge for enabling the coil spring to be discharged from the spring holder that has passed through the region between the grindstones to the lower side of the fixed table. It is characterized in that the outlet is formed.

  The invention of claim 5 is characterized in that, in the coil spring end processing machine according to claim 4, a shutter capable of opening and closing the discharge port is provided.

  A sixth aspect of the present invention is characterized in that, in the coil spring end portion processing machine according to any of the third to fifth aspects, the pair of grinding wheels rotate in opposite directions.

  A seventh aspect of the present invention is the coil spring end processing machine according to any one of the first to sixth aspects, wherein the holder posture changing mechanism sets the spring holder in an upright posture and passes it through the region between the grindstones. Is characterized in that it is configured to be changed into an inclined posture and passed through the region between the grinding wheels.

  The invention according to claim 8 is the coil spring end processing machine according to any one of claims 1 to 7, wherein the holder attitude changing mechanism is configured to set the inclination angle of the spring holder in the inclined attitude to a constant angle in the region between the grindstones. It is characterized in that it is configured to be held in

  The invention according to claim 9 is the coil spring end processing machine according to any one of claims 1 to 7, wherein the holder attitude changing mechanism gradually changes the inclination angle of the spring holder in the inclined attitude in the region between the grindstones. It is characterized by being configured to do so.

  A tenth aspect of the present invention is the coil spring end processing machine according to any one of the second to ninth aspects, wherein the holder posture changing mechanism is provided for each spring holder, and the tip portion is coupled to the spring holder. Corresponding to a linear motion link that moves linearly in the radial direction of the rotary table in conjunction with the change in posture of the spring holder, a movable cam panel that is rotatably provided at the center of the rotary table, and a plurality of linear motion links A plurality of inclined cam grooves that are formed on the movable cam panel and obliquely intersect with the radial direction of the rotary table, cam followers that are provided in each linear motion link and that engage with each inclined cam groove, and rotate the movable cam disk It is characterized in that it is provided with a cam panel drive unit for driving.

  The invention of claim 11 is the coil spring end processing machine according to any one of claims 2 to 9, wherein the holder posture changing mechanism is provided for each spring holder, and the tip is connected to the spring holder, A linear motion link that linearly moves in the radial direction of the rotary table in conjunction with the posture change of the spring holder, a cam follower provided on each linear motion link, a fixed cam panel fixed separately from the rotary table, and a fixed It is characterized in that it has an annular cam groove formed on the cam plate and surrounding the rotation center of the rotary table and engaged with each cam follower of the linear motion link group.

  According to a twelfth aspect of the present invention, in the coil spring end processing machine according to the eleventh aspect, two pairs of grinding wheels are provided for one rotary table, and the spring holder passes through one set of grinding wheels. In the meantime, the spring holder is held in an upright posture, and an annular cam groove is formed so as to hold the spring holder in an inclined posture while the spring holder passes through the other set of grinding wheels.

  The invention according to claim 13 is the coil spring end processing machine according to any one of claims 10 to 12, wherein the pinion is fixed to the rotation center of the spring holder and is formed in a linear link and meshed with the pinion. It is characterized by having a rack.

  According to a fourteenth aspect of the present invention, in the coil spring end processing machine according to any one of the tenth to twelfth aspects, the distal end portion of the linear motion link is rotatable to a position away from the rotation center of the spring holder. It is characterized by being connected.

  A fifteenth aspect of the present invention is the coil spring end processing machine according to any one of the second to fourteenth aspects, wherein the coil spring is fed in a state where the axial direction thereof is directed vertically. A slider that is disposed above the spring feeding device and the rotary table, reciprocates between the spring feeding device and the rotary table, a linear arm that is attached to the slider and moves up and down, and It is characterized in that it is provided with a hand provided at the lower end and capable of holding the coil spring fed by the spring feeding device.

  A coil spring end machining method according to the invention of claim 16 is a coil spring end machining method for machining both ends of a coil spring, and a pair of grinding wheels that rotate together with their end faces facing each other, and a coil A cylindrical spring holder having a spring inserted inside and a shorter axial length than the coil spring is provided, the spring holder is disposed between a pair of grinding wheels, and the axial direction of the spring holder is set to the grinding wheel An end face machining step in which both end faces of the coil spring are surface ground in an upright posture orthogonal to the end face, and the spring holder is disposed between a pair of grinding wheels, and the axial direction of the spring holder is the end face of the grinding wheel And a chamfering process for chamfering the outer edge portions of both end faces of the coil spring.

  The invention of claim 17 is characterized in that, in the coil spring end machining method according to claim 16, the inclination angle of the spring holder in the inclined posture is held at a constant angle in the region between the grindstones.

  The invention of claim 18 is characterized in that, in the coil spring end machining method according to claim 16, the inclination angle of the spring holder in the inclined posture is gradually changed in the region between the grindstones.

[Invention of Claim 1]
According to the coil spring end processing machine of claim 1, when the spring holder accommodating the coil spring is placed in an upright posture and disposed in the region between the grinding wheels, both ends of the coil spring come into contact with the end surfaces of both grinding wheels to perform surface grinding. Is done. In addition, when the spring holder is inclined and placed in an inclined position in the region between the grindstones, the outer edge portions of the both end surfaces of the coil spring come into contact with both grinding wheels and are chamfered. That is, in the coil spring end processing machine of the present invention, both surface grinding and chamfering of both ends of the coil spring can be performed, and the working efficiency is improved. In addition, during the chamfering process, the coil spring is accommodated in the spring holder, and movement in all directions orthogonal to the axial direction is restricted, so that the coil spring being chamfered can be compared with a conventional coil spring end processing machine. The position is stable. Further, since the coil spring is rotated by the grinding resistance force received from the grinding wheel, it is not necessary to sandwich the coil spring between the belt conveyor and the rolling guide as in the prior art, and deformation of the coil spring can be suppressed. . These improve the quality of the chamfering process.

[Invention of claim 2]
According to the configuration of the second aspect, the plurality of spring holders are attached to the outer edge portion of the rotary table so that the posture can be changed, and the rotary table rotates so that each spring holder sequentially passes through the region between the grindstones. Thereby, a plurality of coil springs can be efficiently and sequentially processed.

[Invention of claim 3]
According to the configuration of the third aspect, since the pair of grinding wheels are arranged coaxially and face each other in the vertical direction, the coil spring end processing machine can be made compact in the horizontal direction. In addition, since the fixed table is flush with the end surface of the lower grinding wheel and supports the coil spring in the spring holder from below, the spring holder can be smoothly advanced and retracted into the region between the grinding wheels.

[Invention of claim 4]
According to the structure of Claim 4, when a spring holder passes the discharge port of a fixed table, a coil spring can be discharged | emitted from a spring holder to a discharge port.

[Invention of claim 5]
According to the configuration of the fifth aspect, the discharge of the coil spring to the discharge port can be prohibited by closing the discharge port with a shutter as necessary.

[Invention of claim 6]
According to the configuration of the sixth aspect, since the pair of grinding wheels rotate in opposite directions, the grinding resistance force from the grinding wheel is evenly applied to both ends of the coil spring when the spring holder is inclined. The coil spring can be efficiently rotated.

[Invention of Claim 7]
According to the coil spring end processing machine of claim 7, the spring holder is set in an upright posture and passed through the region between the grindstones so that the coil spring has a predetermined axial length, and then the outer edge portions of both end surfaces are chamfered. be able to.

[Inventions of Claims 8 and 17]
According to the eighth and seventeenth aspects of the present invention, by holding the inclination angle of the spring holder in the inclined posture at a constant angle, tapered chamfering is performed on the outer edge portions of both end surfaces of the coil spring (so-called C chamfering). It can be performed.

[Inventions of Claims 9 and 18]
According to the ninth and eighteenth aspects of the present invention, by gradually changing the inclination angle of the grinding wheel of the spring holder in the inclined posture, the outer edge portions of both end faces of the coil spring are rounded off (so-called R chamfering). Processing).

[Invention of Claim 10]
In the coil spring end processing machine according to claim 10, a linear motion link that linearly moves in the radial direction of the rotary table is provided for each spring holder, and a cam follower provided on the linear motion link is provided at the center of the rotary table. It is engaged with each inclined cam groove of the movable cam panel provided. As a result, when the movable cam panel is rotationally driven by the cam panel drive section, each cam follower moves in each inclined cam groove, so that a plurality of linear motion links are linearly moved at a time, and a plurality of springs are interlocked with this. The holder rotates and changes its posture. Thus, according to the configuration of the present invention, it is possible to change the postures of a plurality of spring holders at a time with a single drive source.

[Invention of Claim 11]
In the coil spring end processing machine according to claim 11, a linear motion link that linearly moves in the radial direction of the rotary table is provided for each spring holder, and the cam follower provided on the linear motion link is separated from the rotary table. It is engaged with an annular cam groove of a fixed fixed cam disk. As a result, when the rotary table rotates, each cam follower moves in each annular cam groove, so that each linear link moves linearly. The spring holder is in an upright posture when the cam follower passes through a predetermined position of the annular cam groove, and the spring holder is in an inclined posture when the cam follower passes through another position of the annular cam groove. That is, according to the present invention, the posture of each spring holder can be changed according to the rotational position together with the rotary table.

[Invention of Claim 12]
According to the structure of the twelfth aspect, two pairs of grinding wheels are provided for one rotary table, and the spring holder is in an upright posture while the spring holder passes through one pair of grinding wheels. Both end portions of the coil spring are subjected to surface grinding, and the spring holder is inclined while the spring holder passes through the other set of grinding wheels, and the outer edge portions of both end surfaces of the coil spring are chamfered. That is, in the present invention, it is possible to chamfer another coil spring while performing surface grinding of the coil spring, and to efficiently process the coil spring.

[Invention of Claim 13]
According to the configuration of the thirteenth aspect, when the rack formed on the linear link is engaged with the pinion fixed to the rotation center of the spring holder, the spring holder rotates when the linear link directly moves.

[Invention of Claim 14]
According to the structure of Claim 14, when a linear motion link moves linearly, force will be provided to the position away from the rotation center among spring holders, and a spring holder will rotate.
In the present invention, for example, in the configuration in which “the tip of the linear link is rotatably connected to a position away from the rotational center of the spring holder”, for example, a pin is provided on one of the linear link and the spring holder. A structure in which a long hole is provided on the other and engaged with each other, and another link is provided between the linear link and the spring holder, and both ends of the other link are connected to the linear link and the spring holder, respectively. A configuration in which a pin is rotatably connected is also included.

[Invention of Claim 15]
According to the configuration of the fifteenth aspect, when the coil spring is accommodated in the spring holder, the slider is moved to the spring feeding device side, the linear motion arm is moved downward, and the hand at the lower end of the linear motion arm is moved. The coil spring is held by. Then, after moving the linear movement arm upward, the slider is moved to the rotary table side. At this time, the spring holder is kept in an upright posture. Then, the coil spring is inserted into the spring holder by moving the linear motion arm downward. And the holding | maintenance by a hand is cancelled | released and a coil spring can be accommodated in a spring holder.

[Invention of Claim 16]
According to the coil spring end portion processing method of claim 16, by arranging the spring holder accommodating the coil spring in an upright posture and between the pair of grinding wheels, both end portions of the coil spring are end faces of both grinding wheels. The surface is ground by abutting. Next, the outer edge portions of the both end surfaces of the coil spring are chamfered by inclining the spring holder and placing the spring holder between the pair of grinding wheels. That is, according to the coil spring end portion processing method of the present invention, both the surface grinding and the chamfering processing of both ends of the coil spring can be performed using a pair of grinding wheels, and the working efficiency is improved. In addition, during the chamfering process, the coil spring is accommodated in the spring holder, and movement in all directions orthogonal to the axial direction is restricted, so that the coil spring being chamfered can be compared with a conventional coil spring end processing machine. The position is stable and the quality of chamfering is improved.

[First Embodiment]
Hereinafter, a coil spring end processing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1A shows a coil spring 90 that requires processing by the coil spring end processing machine 10. The coil spring 90 is a compression coil spring in which a wire 95 having a circular cross section is formed by a spring molding machine (not shown), and includes end winding portions 91 and 91 at both ends. And in order to perform the surface grinding and the chamfering process of the both ends of this coil spring 90, the coil spring end part processing machine 10 of this embodiment is used.

  As shown in FIG. 2, the coil spring end processing machine 10 includes a pair of movable base portions 13 </ b> A and 13 </ b> B arranged vertically on a frame 12 installed on the floor. Between the frame 12 and the upper movable base portion 13A, a linear guide (not shown) extending in the vertical direction and a ball screw mechanism 13G are provided. Then, the ball screw mechanism 13G is operated by the grindstone vertical drive motor 13M, and the movable base portion 13A is positioned at an arbitrary vertical position. Similarly, a linear guide and a ball screw mechanism (both not shown) are provided between the frame 12 and the lower movable base portion 13B, and are moved up and down by a grindstone vertical drive motor (not shown). Positioned at an arbitrary position.

  The upper movable base portion 13A rotatably supports a drive shaft 14A extending in the vertical direction, and a grindstone drive motor 15A is connected to the upper end portion of the drive shaft 14A by a pulley and a belt (both not shown). Has been. On the other hand, the lower movable base portion 13B includes a drive shaft 14B that is rotatably supported on the same axis as the upper drive shaft 14A, and the grindstone drive motor 15B is connected to a pulley and a lower end portion of the drive shaft 14B. They are connected by a belt (both not shown).

  A grinding wheel 20 is fixed to the lower end portion of the upper drive shaft 14A so as to be integrally rotatable, and a grinding wheel 21 is fixed to the upper end portion of the lower drive shaft 14B so as to be integrally rotatable. These grinding wheels 20 and 21 are both disk-shaped and have the same outer diameter. Further, the end faces 20A and 21A facing each other of the grinding wheels 20 and 21 are both flat surfaces orthogonal to the rotation shafts 20J and 21J of the grinding wheels 20 and 21.

  The coil spring end processing machine 10 is provided with a spring holding and moving mechanism 50 for allowing the coil spring 90 to pass through a region R1 between the grinding wheels between the grinding wheels 20 and 21. The spring holding and moving mechanism 50 is attached to a support base 51 that protrudes laterally from the lower part of the frame 12. As shown in an enlarged view in FIG. 3, a plurality of support columns 52 are erected from the upper surface of the support base 51, and a fixed table 55 is attached to the upper ends of the support columns 52. The fixed table 55 has a horizontal disk shape, and the upper surface of the fixed table 55 and the end surface 21A of the lower grinding wheel 21 are flush with each other. Further, in order to avoid interference with the lower grinding wheel 21, the fixed table 55 is provided with an arc-shaped cutout portion 55 </ b> A that is concentric with the grinding wheel 21 and slightly larger in diameter than the grinding wheel 21.

  A movable base plate 53 is attached to an intermediate portion in the longitudinal direction of the support column 52. The movable base plate 53 has a horizontal plate shape, and a cylindrical guide 53G is fixed to a plurality of positions on the outer edge portion so as to penetrate vertically. Then, these guides 53G are inserted into the support columns 52, and the movable base plate 53 is translated in the vertical direction. A ball screw shaft 54 </ b> A is passed between the support base 51 and the fixed table 55 in parallel with the support column 52. A table vertical drive motor 49 attached to the support base 51 is connected to the lower end portion of the ball screw shaft 54A, and a ball nut 54B fixed to the movable base plate 53 is screwed to the intermediate portion of the ball screw shaft 54A. is doing. Accordingly, when the ball screw shaft 54A is rotated by the table vertical drive motor 49, the movable base plate 53 moves up and down.

  A table rotation drive motor 56 is fixed to the lower surface of the movable base plate 53. The rotor shaft 56R of the table rotation drive motor 56 protrudes upward through a through hole 53A provided in the movable base plate 53. On the other hand, a support sleeve 53S is fixed to the upper surface of the movable base plate 53, and a rotary shaft 61 is pivotally supported by a bearing therein. The rotor shaft 56R of the table rotation drive motor 56 is key-coupled to the rotation shaft 61.

  The upper end portion of the rotating shaft 61 is a rotating base 61B that is exposed above the support sleeve 53S and has a larger outer diameter than the support sleeve 53S. The rotation base 61B protrudes above the fixed table 55 through a through hole 55B formed at the center of the fixed table 55. A rotating table 62 is fixed to the rotating base 61B.

  The rotary table 62 is a disc having substantially the same diameter as the fixed table 55 and is disposed concentrically with the fixed table 55. A part of the rotary table 62 is disposed in the inter-grinding wheel region R <b> 1 between the grinding wheels 20 and 21. Further, a plurality of holder receiving recesses 62 </ b> C that are open to the side are formed at a position (for example, a position that is divided into eight equal parts, see FIG. 4) of the outer edge portion of the rotary table 62. And the spring holder 63 is attached in each holder accommodation recessed part 62C.

  As shown in FIG. 6, the spring holder 63 has a cylindrical shape, and a flange 63 </ b> B projects from the central portion in the axial direction. As shown in FIG. 5, the flange 63 </ b> B has a planar square shape, and holder support pins 63 </ b> P (see FIG. 6) protrude from the pair of side surfaces toward the sides. On the other hand, a pair of brackets 62L and 62L are fixed to a pair of opposing edges of the holder housing recess 62C, and each holder 62 is supported on a portion of each bracket 62L facing the holder housing recess 62C. The pin 63P is pivotally supported so as to be rotatable.

  The inside of the spring holder 63 is a spring accommodating hole 63C, and the coil spring 90 is accommodated in the spring accommodating hole 63C so as to be rotatable and linearly movable. The axial length of the spring holder 63 is shorter than the axial length of the coil spring 90. When the coil spring 90 is accommodated in the spring accommodating hole 63C, the both end portions of the coil spring 90 are moved from both end portions of the spring holder 63. It can be made to protrude.

  As shown in FIG. 4, a linear motion guide 67 is attached to the rotary table 62 at a position closer to the center than the holder receiving recess 62 </ b> C so as to correspond to each holder receiving recess 62 </ b> C. As shown in FIGS. 5 and 6, the linear motion guide 67 has a groove-shaped structure extending in the radial direction of the rotary table 62, and is fixed to the rotary table 62 with its side opening facing downward. . The linear motion links 65 are held by the linear motion guides 67 so as to be linearly movable. The linear link 65 has a prismatic shape extending in the radial direction of the rotary table 62, and the end portion on the holder housing recess 62C side is bent at a right angle upward. The intermediate portion of the linear motion link 65 is inserted into the linear motion guide 67, and the linear motion link 65 linearly moves in the radial direction of the rotary table 62.

  An end portion of the linear motion link 65 that is bent upward at a right angle on the holder housing recess 62 </ b> C side and an upper end portion of the spring holder 63 are connected by a rotation link 64. As shown in FIG. 5, the rotation link 64 has a U-shape as a whole, and a pair of pins 64P1 and 64P1 protrudes inward from the pair of opposed portions 64A and 64A. As shown in FIG. 6, these pins 64 </ b> P <b> 1 and 64 </ b> P <b> 1 are rotatably connected to the upper end portion of the spring holder 63. Further, as shown in FIG. 5, a pair of pin connection protrusions 64 </ b> C toward the center side of the rotary table 62 from the connection portion 64 </ b> B that communicates between the pair of opposed portions 64 </ b> A and 64 </ b> A of the rotation link 64. , 64C project, and the end of the linear motion link 65 is disposed between the pin connection protrusions 64C, 64C and is rotatably connected by a pin 64P2.

  As shown in FIG. 6, a movable cam panel 66 is assembled on the upper surface of the rotary table 62 so as to overlap the center side of the linear motion guide 67 group. A cam panel drive motor 57 is placed at the center of the upper surface of the movable cam panel 66. The stator 57S of the cam panel drive motor 57 is fixed to the movable cam panel 66, and the rotor shaft 57R of the cam panel drive motor 57 is directed downward and is key-connected to the rotation base 61B. Thereby, the movable cam board 66 can be rotated relative to the rotary table 62 by the cam board drive motor 57.

  A step portion is provided on the lower surface of the movable cam plate 66, and the outer edge portion of the movable cam plate 66 is thin. Thus, a gap is formed between the outer edge portion of the movable cam panel 66 and the rotary table 62, and the end of the linear motion link 65 is accommodated in the gap. A plurality of inclined cam grooves 66 </ b> M are formed in the outer edge portion of the movable cam panel 66 so as to correspond to the respective linear motion links 65. As shown in FIG. 5, the inclined cam groove 66 </ b> M is inclined with respect to the radial direction of the movable cam panel 66. As shown in FIG. 6, cam follower pins 65 </ b> P standing from the ends of the linear motion links 65 are cam-engaged with the inclined cam grooves 66 </ b> M.

  As a result, when the movable cam panel 66 rotates relative to the one side with respect to the rotary table 62, the cam follower pin 65P is positioned at the end of the inclined cam groove 66M on the center side of the rotary table 62, and the axial direction of the spring holder 63 Becomes an upright posture orthogonal to the rotary table 62 (see FIGS. 5 to 7). Further, when the movable cam panel 66 rotates relative to the other side with respect to the rotary table 62, the cam follower pin 65P is positioned at the end of the inclined cam groove 66M on the outer edge side of the rotary table 62, and the upper end of the spring holder 63 Is away from the center of the rotary table 62, while the central axis of the spring holder 63 is inclined so that the lower end of the spring holder 63 approaches the center side of the rotary table 62, and the spring holder 63 is inclined (see FIG. 8 and FIG. 8). (See FIG. 9).

  As shown in FIG. 3, a stand 59 is attached to the movable cam plate 66 so as to cover the upper side of the cam plate drive motor 57, and a rotary joint 58 is provided on the top surface of the stand 59. The rotary joint 58 is used for electrical wiring at the rotating part. The lower end of the rotary joint 58 is fixed to the gantry 59 and electrically connected to the cam panel drive motor 57, while the upper end of the rotary joint 58 is freely rotated with respect to the gantry 59 and connected to a power source (not shown). Yes. Accordingly, the cam panel drive motor 57 can be rotated together with the rotary table 62 without being restricted by wiring.

  As shown in FIG. 2, a spring feeding device 41 is provided on the side opposite to the grinding wheels 20 and 21 with respect to the spring holding and moving mechanism 50. The spring feeding device 41 has a structure in which a horizontal guide 41G is extended from the main body portion 41H toward the spring holding and moving mechanism 50. Then, when a plurality of coil springs 90 are inserted into the main body 41H, the directions of the coil springs 90 are aligned and aligned on the same axis, and the plurality of coil springs 90 are fed along the horizontal guide 41G. The coil spring 90 is charged into the main body 41H by a belt conveyor 41V.

  An auxiliary arm 42 is provided at the end of the horizontal guide 41G. The auxiliary arm 42 has a rod shape that can be inserted inside the coil spring 90, and rotates between a horizontal posture extending on the extension line of the horizontal guide 41G and a vertical posture standing upright from the extension line of the horizontal guide 41G. Then, the auxiliary arm 42 takes a horizontal posture and receives a single coil spring 90 from the horizontal guide 41G, and then takes a vertical posture. When the coil spring 90 is extracted from the auxiliary arm 42 by the spring feeder 46 described below, the auxiliary arm 42 returns to the horizontal posture, and the same operation is repeated thereafter.

  As shown in FIG. 11, a spring feeder 46 is provided to move the coil spring 90 sequentially from the auxiliary arm 42 to each spring holder 63. The spring feeder 46 is provided with a slider 45 on the side surface of a gantry 46 </ b> A disposed above the auxiliary arm 42. The slider 45 is a portion positioned above the rotary table 62 and the auxiliary arm 42, and linearly moves in the horizontal direction to reciprocate between the rotary table 62 and the auxiliary arm 42. An air cylinder 43A is attached to the slider 45, and a linear motion rod 43B (corresponding to a “linear motion arm” according to the present invention) is inserted into the air cylinder 43A so as to be linearly movable. The linear motion rod 43B protrudes downward from the lower end portion of the air cylinder 43A, and a movable hand 44 is attached to the lower end portion of the linear motion rod 43B. The movable hand 44 includes a pair of opposed claws 44A and 44A, and the coil spring 90 can be held by the opposed claws 44A and 44A.

  The movable hand 44 according to the present embodiment closes the pair of opposing claws 44A and 44A, inserts them inside the coil spring, opens the opposing claws 44A and 44A, and presses them against the inner surface of the coil spring 90. Is configured to hold.

  The spring feeder 46 operates in the following manner in synchronization with the auxiliary arm 42 and the rotary table 62. That is, the linear rod 43B moves horizontally with the slider 45 in a state where it is positioned upward, and moves downward when positioned on the same axis as the auxiliary arm 42, and moves the coil spring 90 inserted through the auxiliary arm 42 into the opposing claw. 44A and 44A. In this state, the direct acting rod 43 </ b> B moves upward to extract the coil spring 90 from the auxiliary arm 42. Next, the slider 45 moves to the spring holding and moving mechanism 50 side. At this time, the spring holder 63 is in an upright posture. Then, the direct acting rod 43 </ b> B moves downward to insert the coil spring 90 into the spring holder 63, and the movable hand 44 releases the holding of the coil spring 90. Thereafter, the coil spring 90 is sequentially accommodated in the plurality of spring holders 63 of the spring holding and moving mechanism 50 by repeating this operation.

  As shown in FIG. 4, for example, an optical position sensor 38 is provided on the side of the rotary table 62. For example, the position sensor 38 is disposed at a position immediately after passing through the grinding wheels 20 and 21 in the rotary table 62, and as shown in FIG. 12, the spring holder 63 passes in front of the position sensor 38 in an upright posture. At this time, the position sensor 38 detects the position of the upper end portion of the coil spring 90. Then, a control unit (not shown) of the coil spring end processing machine 10 receives the detection result of the position sensor 38 and determines whether or not the axial length of the coil spring 90 has reached the reference value.

  As shown in FIGS. 13 and 14, a discharge port 55 </ b> H is provided in a part of the outer edge portion of the fixed table 55. The discharge port 55H can be opened and closed by a shutter 55S. The upper surface of the shutter 55S is flush with the upper surface of the fixed table 55. When the shutter 55S is closed (see FIG. 13), the coil spring 90 slides through the upper surface of the shutter 55S, and the shutter 55S. When is opened, the coil spring 90 is discharged from the spring holder 63 into the discharge port 55H. A forcible exclusion device 37 is provided to reliably perform the discharge. The forcible exclusion device 37 includes a pressing linear motion member 37A on a main body portion 37H fixed to a support base 51 (see FIG. 2). The pressing linearly moving member 37A is linearly moved in a direction inclined with respect to the vertical direction, and operates when the inclined spring holder 63 is disposed on the discharge port 55H, thereby causing the coil spring 90 in the spring holder 63 to move. Push down.

The configuration of the coil spring end processing machine 10 of the present embodiment is as described above.
Next, a method for processing the end of the coil spring 90 using the coil spring end processing machine 10 will be described. When the coil spring end processing machine 10 is activated, a control unit (not shown) executes a predetermined program, and the coil spring end processing machine 10 operates as follows. That is, as shown in FIG. 3, when the coil spring end portion processing machine 10 is activated, the upper grinding wheel 20 moves to a position farther than the distance between the lower grinding wheel 21 and the rotary table 62. Next, as shown in FIG. 11, with the spring holder 63 maintained in an upright posture, the rotary table 62 rotates intermittently in one direction, and the spring feeder 46 inserts the coil spring 90 into each spring holder 63. To go. Then, when the coil spring 90 is accommodated in all the spring holders 63 provided in the rotary table 62, the upper grinding wheel 20 is lowered, and the rotary table is placed between the upper and lower grinding wheels 20, 21 as shown in FIG. 62 is placed.

  Next, the table rotation drive motor 56 (see FIG. 2) rotates the rotation table 62 in the counterclockwise direction in FIG. 4, and the grindstone drive motors 15A and 15B (see FIG. 2) move both the grinding wheels 20 and 21 together. It is rotated in the counterclockwise direction in FIG. Then, the spring holders 63 in the upright posture sequentially pass through the inter-grinding wheel region R1 between the grinding wheels 20 and 21. Then, while the spring holder 63 moves in the inter-grinding region R1, both ends of the coil spring 90 accommodated in the spring holder 63 abut on the grinding wheels 20 and 21 and are subjected to surface grinding as shown in FIG. The Further, when each spring holder 63 is positioned in front of the position sensor 38 after passing through the inter-grinding region R1, the position sensor 38 detects the position of the upper end portion of the coil spring 90, and based on the detection result, the position of the coil spring 90 is determined. It is checked whether the shaft length has reached a reference value. Then, the rotary table 62 rotates a plurality of times until the axial lengths of all the coil springs 90 reach the reference value. Thereby, as shown to FIG. 1 (B), the flat surface 90H is formed in the both ends of a coil spring.

  When the axial length of all the coil springs 90 reaches the reference value, the grinding wheels 20 and 21 and the rotary table 62 are stopped. Then, the rotary table 62 is raised by the table vertical drive motor 49 (see FIG. 3), and the grinding wheel 20 is lifted by the grinding wheel vertical drive motor 13M (see FIG. 2). 20 and 21 are not interfered with. In this state, the cam panel drive motor 57 (see FIG. 3) rotates the movable cam panel 66 in the clockwise direction in FIG. Then, the center axis of the spring holder 63 is inclined 45 degrees with respect to the grindstone end surfaces 20A and 21A of the grindstone wheels 20 and 21.

  Next, the rotary table 62 and the upper grinding wheel 20 are lowered, the rotary table 62 is positioned between the upper and lower grinding wheels 20, 21, and the outer edges of both end faces of the coil spring 90 accommodated in the spring holder 63 are located. It arrange | positions in the position where both grinding wheels 20 and 21 contact | abut.

  Then, as shown in FIG. 10, the upper grinding wheel 20 and the lower grinding wheel 21 are rotated in different directions, and the rotary table 62 is rotated counterclockwise in FIG. Then, while the spring holder 63 moves in the inter-grinding wheel region R1, as shown in FIG. 9, the outer edges of both end surfaces of the coil spring 90 accommodated in the spring holder 63 come into contact with the grinding wheels 20 and 21 to chamfer. Processed. At this time, the grinding resistance forces F1 and F2 that the coil spring 90 moving in the inter-grinding region R1 receives from the grinding wheels 20 and 21 are tangent to a circle around the winding axis 90J of the coil spring 90 as shown in FIG. The directions are opposite to each other. Thereby, the coil spring 90 rotates in the spring holder 63. At this time, the rotation of the coil spring 90 is accelerated by the rotation of the grinding wheels 20 and 21, but cannot completely follow, and the difference between the speeds of the coil springs 90 between the end surfaces 20A and 21A of the grinding wheels 20 and 21. Rotate while sliding. Thereby, as shown in FIG. 1C, C chamfered portions 93, 93 are formed on the outer edge portions of the both end portions of the coil spring 90.

  When a predetermined time has elapsed, the grinding wheels 20 and 21 are stopped. Then, as shown in FIG. 14, the shutter 55S is opened and the rotary table 62 is intermittently rotated, and the rotary table 62 is temporarily stopped each time each spring holder 63 is positioned on the discharge port 55H. Then, the pressing linear motion member 37A enters the spring holder 63, and the coil spring 90 is pushed out into the discharge port 55H. Thereby, the coil spring 90 after the chamfering process is accommodated in a box (not shown).

  Here, each time the spring holder 63 is positioned on the discharge port 55H and the rotary table 62 is temporarily stopped, the coil spring 90 is inserted from the spring feeder 46 into the empty spring holder 63. Thereby, discharge of the processed coil spring 90 and accommodation of the unprocessed coil spring 90 in the spring holder 63 can be performed simultaneously. When the coil springs 90 of all the spring holders 63 are replaced with the unprocessed coil springs 90, the same operation is repeated thereafter. Thereby, both ends of the plurality of coil springs 90 can be processed efficiently.

  As described above, according to the coil spring end processing machine 10 of the present embodiment, both the surface grinding and the chamfering of both ends of the coil spring 90 can be performed, and the working efficiency is improved. In addition, during the chamfering process, the coil spring 90 is accommodated in the spring holder 63 and is restricted from moving in all directions orthogonal to the axial direction. The spring position is stabilized. Further, since the coil spring is rotated by the grinding resistance force received from the grinding wheel, it is not necessary to sandwich the coil spring between the belt conveyor and the rolling guide as in the prior art, and deformation of the coil spring can be suppressed. . These improve the quality of the chamfering process. Further, in the coil spring end processing machine 10 of the present embodiment, the plurality of spring holders 63 can be changed to the upright posture and the inclined posture at a time with one drive source (cam panel drive motor 57).

  As described above, when the spring holder 63 is in the inclined posture, the inclination angle may be held at a constant angle, or the movable cam plate 66 is reciprocally rotated by the cam plate drive motor 57, and the spring is held. By changing the inclination angle of the holder 63, R chamfered portions 94, 94 may be formed on the outer edge portions of both ends of the coil spring 90 as shown in FIG.

[Second Embodiment]
This embodiment is shown in FIGS. 15 and 16, and a mechanism for changing the posture of the spring holder 63 is different from that of the first embodiment. Hereinafter, only the configuration different from that of the first embodiment will be described, and the same configuration as that of the first embodiment will be denoted by the same reference numerals and redundant description will be omitted.

  As shown in FIG. 15, a pinion gear 70 is fixed to the holder support pin 63P of the spring holder 63 of this embodiment. On the other hand, a rack 71 is formed at the tip of the linear motion link 65, and the rack 71 and the pinion gear 70 are engaged with each other. Specifically, as shown in FIG. 16, the pinion gear 70 is fixed to a tip portion of the spring holder support pin 63P that penetrates the bracket 62L, and the pinion gear 70 is provided at the opposite edge of the holder housing recess 62C in the rotary table 62. A pinion accommodating portion 62D for accommodating is cut out. Moreover, the front-end | tip part of the linear_motion | direct_drive link 65 is divided into two forks, and it has become a pair of arm parts 69 and 69 which oppose on both sides of the spring holder 63 in between. A rack 71 is formed on the lower surface of each arm 69 (see FIG. 15) and meshes with the pinion gear 70. With the above configuration, when the movable cam panel 66 rotates, the linear link 65 moves in the radial direction of the rotary table 62, and the spring holder 63 rotates in the radial direction of the rotary table 62 in conjunction with this.

[Third Embodiment]
This embodiment is shown in FIGS. 17 and 18, and is different from the first and second embodiments in that a fixed cam plate 72 is provided instead of the movable cam plate 66. Hereinafter, only configurations different from those of the first and second embodiments will be described, and the same configurations as those of the first and second embodiments will be denoted by the same reference numerals and redundant description will be omitted.

  As shown in FIG. 17, in the present embodiment, a fixed cam board 72 is fixed at a position closer to the center on the upper surface of the fixed table 55. In the present embodiment, the rotation link 64, the linear motion link 65, and the linear motion guide 67 are disposed on the lower surface side of the rotary table 62. The base end portion of the linear motion link 65 is disposed in the gap between the rotary table 62 and the fixed cam panel 72.

  As shown in FIG. 18, an annular cam groove 72 </ b> M is formed on the outer edge portion of the upper surface of the fixed cam panel 72. On the other hand, a cam follower 65F is attached to the base end portion of the linear motion link 65, and the cam follower 65F is engaged with the annular cam groove 72M. As shown in FIG. 17, an interference avoidance groove 62 </ b> E for receiving the shaft portion of the cam follower 65 </ b> F protruding upward from the linear motion link 65 is formed on the lower surface of the rotary table 62.

  Further, in this embodiment, two pairs of grinding wheels 20 and 21 are provided for one rotary table 62. Here, when one set of grinding wheels 20 and 21 is a “first grinding wheel set 20X” and the other set of grinding wheels 20 and 21 is a “second grinding wheel set 20Y”, the rotary table 62 is When rotating, the first and second grinding wheel sets 20X and 20Y are moved so that each spring holder 63 passes through the second grinding wheel set 20Y with a delay of 90 degrees after passing through the first grinding wheel set 20X. They are arranged with an interval of 90 degrees.

  Now, as shown in FIG. 18, the annular cam groove 72M is curved so that the curvature changes in the portion corresponding to the second grinding wheel set 20Y, and the whole is curved with the same curvature in the other portions. . Accordingly, when the spring holder 63 passes through a portion other than the second grinding wheel set 20Y, the posture is maintained, and the posture is changed in the second grinding wheel set 20Y and the vicinity thereof. Specifically, the annular cam groove 72M is maintained in an upright posture when the spring holder 63 passes through the first grinding wheel set 20X, and is inclined immediately before the spring holder 63 reaches the second grinding wheel set 20Y. After being changed to the posture and passing through the second grinding wheel set 20Y in the inclined posture, the posture is returned to the upright posture.

The configuration of the present embodiment is as described above. Next, the effect of this embodiment is demonstrated.
In the present embodiment, the rotary table 62 rotates at a lower speed than in the first embodiment. Then, each cam follower 65F moves in the annular cam groove 72M of the fixed cam panel 72, and the posture of the spring holder 63 is appropriately changed according to the position of the cam follower 65F in the annular cam groove 72M. Specifically, the spring holder 63 moves in the upright posture in the inter-grinding wheel region R1 of the first grinding wheel set 20X. Thereby, both ends of the coil spring 90 are surface ground. Here, since the rotary table 62 rotates at a low speed, the surface grinding of both end portions of the rotary table 62 is completed while passing through the first grinding wheel set 20X once.

  In addition, the spring holder 63 is rotated 45 degrees before reaching the second grinding wheel set 20Y to be in an inclined posture, and is maintained in this inclined posture of 45 degrees and is a region between the grinding wheels of the second grinding wheel set 20Y. Move R1. Thereby, the outer edge part of the both end surfaces of the coil spring 90 is chamfered. Also here, since the rotary table 62 is rotating at a low speed, the chamfering of both ends of the rotary table 62 is completed while passing through the second grinding wheel set 20Y once.

  Further, the spring holder 63 returns to the upright posture when passing through the second grinding wheel set 20Y. Then, the coil spring 90 falls into the discharge port 55H that is always open, and the spring feeder 46 sequentially inserts the unprocessed coil spring 90 into the spring holder 63 that is emptied, and the same operation is repeated thereafter.

  As described above, according to the coil spring end processing machine of this embodiment, it is possible to perform chamfering of another coil spring 90 while performing surface grinding of the coil spring 90, and to efficiently perform the coil spring 90. Can be processed.

  In this embodiment, the discharge port 55H may be closed with the shutter 55S, and the rotary table 62 may be rotated a plurality of times to complete the processing of the coil spring 90.

[Fourth Embodiment]
This embodiment is shown in FIG. 19, and only the shape of the annular cam groove 72M is different from the third embodiment. That is, the annular cam groove 72M of the present embodiment is formed so that the inclination angle of the spring holder 63 gradually changes while the spring holder 63 moves in the inter-grinding wheel region R1 of the second grinding wheel set 20Y. Yes. According to this configuration, the R chamfered portion 94 (see FIG. 1D) can be formed on the outer edge portions of the both end surfaces of the coil spring 90.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) Although the grinding wheels 20 and 21 are coaxially arranged in the first embodiment, the grinding wheels 20 and 21 are partially shifted by shifting the grinding wheel 20 and the grinding wheel 21 by a radius, for example. You may make it the structure made to oppose. In addition, if a pair of grinding wheels 20 and 21 are arrange | positioned coaxially like the said 1st Embodiment, the coil spring edge part processing machine 10 can be made compact in a horizontal direction.

  (2) The movable hand 44 of the first embodiment has a structure in which the gap between the opposing claws 44A and 44A is opened inside the coil spring 90 and pressed against the inner surface of the coil spring 90. The coil spring 90 may be sandwiched between the two.

  (3) Although the coil spring 90 of the first embodiment is formed from the wire 95 having a circular cross section, it is a coil spring composed of a wire having an irregular cross section, specifically, a wire having an angular cross section and an elliptical cross section. There may be.

  (4) In the first embodiment, the linear link 65 and the spring holder 63 are connected via the rotation link 64. For example, a pin is provided on one of the linear link 65 and the spring holder 63 and the other is provided. Alternatively, a long hole may be provided to engage with each other.

The side view of the coil spring which concerns on embodiment of this invention Side view of the coil spring end processing machine according to the first embodiment. Side sectional view of holder moving mechanism Plan view of coil spring end processing machine Partial enlarged plan view of rotary table Partial side cross-sectional view of upright spring holder and rotary table Side sectional view of an upright spring holder Partial sectional side view of the spring holder and rotary table in an inclined position Side sectional view of the spring holder in an inclined position Perspective view of a coil spring sandwiched between a pair of grinding wheels Side view of spring feeder Side sectional view of the spring holder when measuring the axial length Side view of linear motion pressing member Side view of linear motion pressing member Partial sectional side view of the rotary table of the second embodiment Partial enlarged plan view of rotary table Partial sectional view of a rotary table of a third embodiment Bottom view of rotary table Bottom view of rotary table of fourth embodiment Side view of a conventional coil spring end processing machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coil spring edge part processing machine 20,21 Grinding wheel 20A, 21A End surface 41 Feeding device 42 Auxiliary arm 43B Linear motion rod (linear motion arm)
44 Movable Hand 45 Slider 46 Spring Feeder 50 Spring Holding and Moving Mechanism 55 Fixed Table 55H Discharge Port 55S Shutter 57 Cam Board Drive Motor 62 Rotary Table 63 Spring Holder 63P Holder Support Pin 65 Direct Acting Link 65F Cam Follower 65P Cam Follower Pin 66 Movable Cam Board 66M Inclined cam groove 70 Pinion gear 71 Rack 72 Fixed cam panel 72M Annular cam groove 90 Coil spring

Claims (18)

In the coil spring end processing machine that processes both ends of the coil spring,
A pair of grinding wheels that rotate together with their end faces facing each other;
A cylindrical spring holder in which the coil spring is inserted and whose axial length is shorter than the coil spring;
A holder moving mechanism that holds the spring holder and advances and retracts to a region between the grinding wheels between the grinding wheels;
An upright posture in which the axial direction of the spring holder is orthogonal to the end face of the grinding wheel, and both end faces of the coil spring are in contact with the end faces of the grinding wheels, and the axial direction of the spring holder is the end face of the grinding wheel And an inclined posture in which the outer edge portions of both end faces of the coil spring are brought into contact with the two grinding wheels and the coil spring is rotated in the spring holder by a grinding resistance force from the grinding wheel. A coil spring end processing machine comprising a holder posture changing mechanism for changing the posture of a spring holder.   The holder moving mechanism includes a rotary table that rotates in one direction and has a plurality of spring holders attached to the outer edge so that the posture can be changed, and a part of the outer edge of the rotary table is disposed in the region between the grinding wheels. The coil spring end processing machine according to claim 1, wherein the coil spring end processing machine is arranged in a vertical direction. The pair of grinding wheels are arranged coaxially and face each other in the vertical direction,
The fixed table which supports the said coil spring in the said spring holder from the downward direction facing the said rotary table and it is flush | planar with the end surface of the said lower grinding wheel is provided. The coil spring end processing machine according to 2.   The discharge port for allowing the coil spring to be discharged below the fixed table from the spring holder that has passed through the region between the grindstones is formed in the fixed table. Coil spring end processing machine.   The coil spring end processing machine according to claim 4, further comprising a shutter capable of opening and closing the discharge port.   6. The coil spring end processing machine according to claim 3, wherein the pair of grinding wheels rotate in directions opposite to each other.   The holder posture changing mechanism is configured to change the spring holder to the inclined posture and pass through the region between the grindstones after passing the spring holder in the upright posture and passing through the region between the grindstones. The coil spring end part processing machine according to any one of claims 1 to 6.   The said holder attitude | position change mechanism is comprised so that the inclination | tilt angle of the said spring holder made into the said inclination attitude | position may be hold | maintained to the fixed angle in the area | region between the said grindstones. The coil spring end processing machine as described.   The said holder attitude | position change mechanism is comprised so that the inclination | tilt angle of the said spring holder made into the said inclination attitude | position may be changed gradually in the area | region between the said grindstones. Coil spring end processing machine. The holder posture changing mechanism is provided for each of the spring holders, and has a leading end connected to the spring holder, and linearly linked in the radial direction of the rotary table in conjunction with the posture change of the spring holder. When,
A movable cam panel rotatably provided at the center of the rotary table;
A plurality of inclined cam grooves formed on the movable cam plate corresponding to the plurality of linear motion links and obliquely intersecting with the radial direction of the rotary table;
A cam follower provided in each linear link and engaged with each inclined cam groove;
The coil spring end part processing machine according to any one of claims 2 to 9, further comprising a cam panel drive unit for rotationally driving the movable cam panel. The holder posture changing mechanism is provided for each of the spring holders, and has a leading end connected to the spring holder, and linearly linked in the radial direction of the rotary table in conjunction with the posture change of the spring holder. When,
Cam followers provided in each of the linear motion links;
A fixed cam board fixed separately from the rotary table;
3. An annular cam groove formed on the fixed cam plate and having an annular shape surrounding the rotation center of the rotary table and engaged with the cam followers of the linear motion link group. The coil spring end part processing machine in any one of thru | or 9. Two sets of the pair of grinding wheels are provided for one rotary table,
While the spring holder passes through the grinding wheel of one set, the spring holder is held in the upright posture, and the spring holder is moved while the spring holder passes through the grinding wheel of the other set. The coil spring end processing machine according to claim 11, wherein the annular cam groove is formed so as to be held in an inclined posture. A pinion fixed to the center of rotation of the spring holder;
The coil spring end processing machine according to any one of claims 10 to 12, further comprising a rack formed on the linear link and meshed with the pinion.   13. The coil spring end machining according to claim 10, wherein a tip end portion of the linear motion link is rotatably connected to a position away from a rotation center of the spring holder. Machine. A spring feeding device that feeds the coil spring in a state in which the axial direction thereof is directed in the vertical direction;
A slider disposed above the spring feeding device and the rotary table, and reciprocating between the spring feeding device and the rotary table;
A linear arm mounted on the slider and moving up and down;
The coil spring end according to any one of claims 2 to 14, further comprising: a hand provided at a lower end portion of the linear motion arm and capable of holding a coil spring fed by the spring feeding device. Partial processing machine. In the coil spring end machining method for machining both ends of the coil spring,
A pair of grinding wheels rotating together with their end faces facing each other, and a cylindrical spring holder in which the coil spring is inserted inside and whose axial length is shorter than the coil spring,
End face machining in which the spring holder is disposed between the pair of grinding wheels, and the both ends of the coil spring are surface-grinded in an upright posture in which the axial direction of the spring holder is orthogonal to the end face of the grinding wheel Process,
The spring holder is disposed between the pair of grinding wheels, and the axial direction of the spring holder is inclined with respect to the end surface of the grinding wheel, and the outer edges of both end surfaces of the coil spring are chamfered. And a chamfering process for processing. A coil spring end processing method.   The coil spring end machining method according to claim 16, wherein an inclination angle of the spring holder in the inclined posture is maintained at a constant angle in the region between the grindstones. The coil spring end machining method according to claim 16, wherein an inclination angle of the spring holder in the inclined posture is gradually changed in the region between the grindstones.

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