JP2007044707A - Wire spring molding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique regarding a wire spring molding device in which the cost of a servomotor is reduced, and the bending precision of a wire spring is improved, and maintainablility is excellent. <P>SOLUTION: The wire spring molding device is constituted so that the driving force of a single driving servomotor 215 fitted to the upper part of the outside of the wire spring molding device so as to be freely rotatable to the horizontal direction and arranged on the extension of the central axis of a quill 210 at the tip part of an arm 214 stretched to the front of the quill 210 is transferred in order of a rotary operation distributing mechanism 216; each universal joint mechanism 219; a rotary unit 212 for bending/molding; and a bending/molding tool 213, and an abutted wire rod W is subjected to bending/molding, and a servomotor 224 for a table synchronous motor interlocked with a rotary table 204 provided with the rotary unit 212 for molding and rotating the whole of the rotary operation distributing mechanism 216 around the rotary axis of the driving servomotor 215 is included. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a technique for a wire spring molding apparatus that has high processing accuracy of the wire spring and has excellent maintainability.

  As a conventional spring forming apparatus, there is one shown in the following Patent Document 1 (Japanese Patent Laid-Open No. 10-323731) having the configuration described in FIGS. 10 and 11. The spring forming device is provided on the bending device 30A and advances a bending tool 34 slidably moving back and forth via the slider 48 and the spline shaft 38a in the direction of the wire W fed from the quill 28a. The wire material is bent by being engaged and rotated via the tool rotation mechanism 100.

  At this time, the mechanism for rotating the bending tool 34 operates as follows (see FIGS. 10 and 11). That is, when the servo motor 102 operates according to an instruction from the NC device, the driving force is transmitted to the second driving large gear 108 via the worm reduction mechanism 104 and the second driving small gear 106. When the second driving large gear 108 rotates (see FIG. 11), the second driven small gear 110 meshing with the second driving small gear 110 rotates, and is attached to the other end of the rotating shaft 112 with respect to the second driven small gear 110. The drive side bevel gear 114 rotates. The rotational force of the drive-side bevel gear 114 is transmitted to the machining tool holding member 36 through the path of the driven-side bevel gear 126 → the fixed-side rotating cylinder 124 → the rotating shaft 38 (spline shaft 38a) → the universal joint 42 → the rotating shaft 40 → the universal joint 44. Then, the bending tool 34 rotates (from the description of the patent document [0057]).

Japanese Patent Laid-Open No. 10-323731

  In the conventional spring forming apparatus, it can be said that the path to transmit the driving force of the drive servo motor 102 to the rotating operation of the bending tool 34 is complicated. That is, the tool rotation drive mechanism 100 requires at least four gear engagements and two universal joints to rotate the bending tool 34. Therefore, since many such connecting mechanisms cause accumulation of backlash, a transmission loss occurs in the driving force on the path until the driving force generated by the driving servo motor 102 rotates the bending tool 34, and the wire spring There is a problem that the processing accuracy is adversely affected in the molding.

  In the conventional spring molding apparatus, the members from the drive servo motor 102 to the second driven small gear 110 in the path for transmitting the driving force to the bending tool 34 are located inside the spring molding apparatus casing. Since it is installed, there is a problem that it takes time to remove and maintain each member.

  The object of the present invention has been made in view of the above-described problems. In addition to reducing the cost of the servo motor by operating a plurality of rotary tools with a single drive servo motor. , Simplify the transmission mechanism from the drive servo motor to the rotary tool, reduce the transmission loss of the driving force on the transmission path, improve the processing accuracy of the wire spring and have high maintainability To provide technology about.

In order to solve the above-mentioned problem, the invention of claim 1 is arranged radially on the surface of the main plate constituting the molding stage around the center line of the quill that feeds the wire to the molding stage via the pressure roller. A bending molding rotation unit, a bending molding tool provided on the bending molding rotation unit to bend the wire rod by being abutted against the wire rod fed to the molding stage, and a rotation of one drive servo motor. An interlocking rotation mechanism that rotates all of the one or two or more bending forming rotation units in conjunction with a movement operation,
The interlocking rotation mechanism is provided outside the wire spring molding apparatus and in front of the quill.

  Accordingly, the drive servo motor and the interlocking rotation mechanism are all arranged outside the main body of the spring molding apparatus, and maintenance is also performed outside the main body.

  The invention according to claim 2 is the wire spring molding apparatus according to claim 1, wherein the interlocking rotation mechanism is extended from the outside of the wire spring molding apparatus toward the front of the quill. And the one drive servomotor arranged so that the axis of the rotation axis coincides with the extension line of the center line of the quill, and the rotation of the drive servomotor. In order to distribute and convert the dynamic motion into a plurality of rotational motions, a rotational motion distribution mechanism composed of a main driving gear installed in the drive servo motor and a plurality of gears assembled to the main driving gear, and one end thereof By being fixed to the driven gear and having the other end connected to the bending forming rotation unit, the one or more bending forming rotation units are coupled with the rotation operation of the main driving gear. all Rotating, and further comprising a, as many universal joint mechanism and the number of installed said bending for rotating unit.

  Therefore, there are few gear engagement points in the path until the driving force of the drive servomotor is transmitted to the bending tool provided on the molding rotation unit.

  The invention according to claim 3 is the wire spring forming apparatus according to claim 2, wherein the arm has a base end portion on the outside of the wire spring forming apparatus, via the arm support portion, with respect to the horizontal direction. It is characterized by being pivotably attached.

  Therefore, when the bending molding rotation unit is not used, the arm can be rotated and placed aside after removing the universal joint mechanism.

  The invention according to claim 4 is the wire spring molding apparatus according to any one of claims 1 to 3, wherein the main plate constituting the molding stage is pivotable about the center line of the quill. A table synchronization servomotor which is configured as a table and is provided separately from the drive servomotor on the arm and which rotates in synchronization with the rotation operation of the rotation table; and the table synchronization servomotor An installed main driving pulley and a driven pulley that rotates around the central axis of the drive servo motor integrally with the rotation operation distribution mechanism and the universal joint mechanism in conjunction with the rotation operation of the main driving pulley via the driving pulley. And a pulley.

  Therefore, even when the turning table provided with the bending forming turning unit is turned in order to bend the wire in an arbitrary direction, the turning motion distribution mechanism and the universal joint mechanism are both As mentioned above, it rotates around the central axis of the drive servomotor in synchronization with the rotation table.

  The effects of the invention described in claims 1 to 4 will be described below.

  In the invention of claim 1, all the bending forming rotation units can be rotated by one drive servo motor. On the other hand, by providing the interlocking rotation mechanism outside the spring molding device, the wire spring molding device can be added later externally without having a mechanism for rotating the bending tool. Further, the external structure simplifies the internal structure of the spring molding device, while the drive servo motor and the interlocking rotation mechanism can be easily attached and detached, thereby improving maintainability. Therefore, the above-mentioned problem that the maintenance is troublesome is solved.

  In the invention of claim 2, since the accumulation of backlash is reduced by reducing the number of engagement positions of the drive servomotor and the gear, the driving force on the road from the drive servomotor to the rotating bending tool is reached. The transmission loss is also reduced. Therefore, the processing accuracy of the wire spring is improved, and the problem of adversely affecting the processing accuracy at the time of forming the wire spring is solved by reducing the transmission loss in the previous period.

  In the invention of claim 3, since the arm can be rotated to the side when it is unnecessary for the work, the wire spring is molded using a non-rotating molding tool, or the wire spring is molded. Even when the work itself is not performed, the arm does not get in the way.

  According to a fourth aspect of the present invention, even if the rotating table rotates about the center line of the quill, the bending forming rotating unit rotates without being hindered by the rotating operation of the rotating table. Move.

  Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view of a wire spring molding apparatus according to this embodiment (hereinafter simply referred to as an example), FIG. 2 is a partial sectional side view showing the entire structure of the wire spring molding apparatus, and FIG. FIG. 4 is a partially sectional side view in which the rotating motion distributing mechanism is enlarged, FIG. 5 is a partially sectional side view in which the periphery of the bending forming rotating unit is enlarged, and FIG. FIG. 7 is a front view of the upper base, FIG. 8 is an explanatory view of the mechanism of the arc cam and cam follower, and FIG. 9 is a perspective view showing the tip of the bending tool.

  First, the outline of the wire spring molding apparatus according to the embodiment will be described with reference to FIG. 1. In the drawing, the gantry 200 supports an upper base 201 on the upper portion thereof, and a servo motor (wire material described later is pumped to the gantry 200. For driving a pair of pressure feed rollers 203, a table rotation servo motor 205 for rotating a rotation table 204 to be described later, and a slide for advancing and retreating a slide unit 206 to be described later. A multi-axis numerical control device 208 (12-axis numerical control device in the illustrated embodiment, since there are eight arc cam units 209) for positioning and driving the servo motor 207).

  Further, the upper base 201 can be rotated with respect to a central axis of a plurality of arc cam units 209 (eight in this embodiment) to be driven and a quill 210 to be described later by a corresponding number of built-in servo motors. An attached rotation table 204 is provided. A plurality of slide units 206 (four in this embodiment) that are moved forward or backward by the driving force of the arc cam unit 209 are provided on the rotating table 204.

  Next, the outline of the wire spring molding apparatus in the embodiment will be described from the side with reference to FIG.

  A wire W for forming the wire spring is described later by a predetermined length set by a pair of pressure rollers 203 via a gear train 202b meshed with a gear 202a fixed to a drive shaft of the servomotor 202 for pressure. To the quill 210 (wire guide). At this time, the wire W passes through the intermediate quill 210 a fixed to the upper base 2, and is sent out to the forming stage on the front surface of the wire spring forming apparatus according to the present embodiment via the quill 210 by the pressure feeding roller 203. Then, the wire W sent to the forming stage is abutted against the bending tool 213 advanced in the direction of the center line of the quill 210, and is bent by the turning operation of the bending tool 213. A bending forming rotation unit 212 (hereinafter simply referred to as a rotation unit) provided with a bending tool 213 is mounted on a slide unit 206 that is moved forward or backward toward the wire W.

  On the other hand, the arm 214 is extended from the upper side to the front side of the wire spring molding apparatus, and the arm 214 is attached to the outside of the wire spring molding apparatus so as to be rotatable with respect to the horizontal direction by the arm support portion 214a. ing. At the tip of the arm 214, a drive servo motor 215 for rotating the rotation unit 212, and a rotation operation distribution mechanism 216 and a universal joint mechanism, which will be described later, are synchronized with the rotation operation of the rotation table 204. A table synchronizing servo motor 224 is installed to rotate 219 around the rotation axis of the drive servo motor 215.

  Here, the outline of the transmission mechanism for rotating the bending tool 213 will be described with reference to FIG. 2. The drive servo motor 215 faces the quill 210 at the tip of the arm and rotates in the drive servo motor 215. The axial line of the shaft and the extended line of the center line of the quill are arranged so as to coincide with each other. In addition, a rotational motion distribution mechanism 216 (hereinafter simply referred to as a distribution mechanism) is provided in front of the drive servo motor 215.

  As shown in FIG. 3, the distribution mechanism 216 includes a main driving gear 217 fixed on the rotating shaft of the drive servo motor 215, and a driven pulley 226 attached to the rotating shaft via a ball bearing. , And a plurality of driven gears 218 that mesh with the main driving gear 217 and are mounted on the driven pulley 226 via ball bearings.

  Further, as shown in FIG. 2, the main joint 222 of the universal joint mechanism 219 is attached to the tip of the driven gear 218, and the driven joint 223 of the universal joint mechanism is attached to the corresponding rotation unit 212. It is attached. Accordingly, the bending tool 213 provided on each rotation unit 212 is rotated via each universal joint mechanism 219 attached to the driven gear 218 when the drive servo motor 215 is driven. become.

  On the other hand, as shown in FIG. 2, the rotary table 204 is provided with the slide units 206 so as to be radially on the surface and perpendicular to the extending direction of the center line of the quill 210. The quill 210 is supported by the upper base 201 so as to be rotatable through a cross roller bearing around the center line of the quill 210 (see FIG. 1). Therefore, when the table rotation servomotor 205 is driven, the rotation table 204 rotates about the center line of the quill 210 via the ring gear 228 meshing with the gear 227 fixed to the output shaft of the motor 205. The wire W is bent in various directions by adjusting the direction in which the tip of the bending tool 213 is brought into contact with the wire.

  Next, the structure around the distribution mechanism 216 will be described in detail with reference to FIG. 4. The main driving gear 217 is fixed to the rotating shaft of the drive servo motor 215, and the driven pulley 226 is connected to the rotating shaft via a ball bearing. It is attached so that it can rotate freely. A plurality of driven gears 218 are attached to the driven pulley 226 via ball bearings so as to be rotatable in the driven pulley 226. On the other hand, the main joint 222 of the universal joint 219 mechanism is fixed to the tip of the driven gear 218 so as to rotate integrally with the driven gear 218.

  2, the universal joint mechanism 219 of the present embodiment includes an arm part 220 and an arm part 221 that are combined in a freely stretchable manner, and a main joint 222 and a follower joint 223 formed at both ends of the arm part. Yes. The arm portion 220 is formed so as to be inserted as a core of the arm portion 221. A plurality of male splines are formed in the axial direction on the outer peripheral surface of the arm portion 220 (not shown), and the arm portion 221 is formed. It is conceivable to form a number of female spline grooves (not shown) corresponding to the splines in the axial direction on the inner peripheral surface. With such a configuration, the arm unit 220 can be stretched and contracted along the spline groove with respect to the arm unit 221 and the relative rotation of the arm unit 220 with respect to the arm unit 221 is limited. When 215 is driven, both arms 220 and 221 rotate together. For example, a structure using a total roller bearing is conceivable as the structure of the main coupling 222 and the driven coupling 223.

  Further, when the rotary table 204 rotates to adjust the bending direction of the wire rod, the table synchronous motor 224 shown in FIG. 4 is rotated in synchronization with the operation of the rotary table 204. The main driving pulley 225 fixed to the main driving pulley 225 is rotated, and the driven pulley 226 that meshes with the driving belt 225a is rotated through the driving belt 225a meshed with the main driving pulley 225. At this time, each driven gear 218 attached to the driven pulley 226 and the universal joint mechanism 219 attached to the driven gear 218 are engaged with the main driving gear 217 to rotate around the rotation axis of the driven gear 218. However, as a whole, it rotates around the rotation axis of the drive servo motor 215.

  In addition, when the slide unit 206 is directly arranged on the upper base 2 without providing the rotation table 204 on the upper base 2 from the above point, the table synchronous motor 224 and the driving belt 225a are not necessary.

  Next, the structure around the bending forming rotation unit 212 will be described in detail with reference to FIG. A driven joint 223 of the universal joint mechanism 219 and a bevel gear 229 are attached to the unit main body via a ball bearing so as to be rotatable as a unit, and a bevel gear 230 that meshes with the bevel gear 229. And a bending tool 213 are attached so as to be rotatable as a unit via a ball bearing. Accordingly, the bending tool 213 is rotated via the driven joint 223 and the bevel gears 229 and 230 by driving the drive servo motor 215.

  Next, the structure of the arm support portion will be described with reference to FIG.

  In the present embodiment, a solid cylindrical inner cylinder shaft 232 is screwed to the upper surface of the bottom plate portion 231 which is fixed to the main body of the wire spring molding device by screwing 231a (two locations in this embodiment). In this embodiment, it is fixed by three places). A thrust washer 233 having an inner diameter substantially the same as the outer diameter of the inner cylinder shaft and an outer cylinder shaft 234 that is formed in a hollow cylindrical shape and is opened downward are fitted into the outer periphery of the inner cylinder shaft. ing. The outer cylinder shaft 234 is configured by screwing a top plate 234b on the upper surface of the hollow cylinder 234a with screws 234c (four in this embodiment).

  Also, a screw hole 232b is provided on the upper surface of the inner cylinder shaft, and a through hole 234d whose center coincides with the screw hole 232b is provided on the upper surface of the outer cylinder shaft. Then, a bolt 236 is screwed into the screw hole 232b from above the through hole 234d via a thrust washer 235 and a double nut 236a for preventing loosening. An arm 214 is welded and fixed to each outer peripheral side surface of the outer cylinder shaft 234 at each welded portion 237.

  Therefore, with the above-described configuration, the arm 214 fixed integrally with the outer cylinder shaft 234 with the upper and lower surfaces of the outer cylinder shaft 234 as sliding surfaces by the action of the thrust washers 233 and 235 is attached to the inner cylinder shaft 232. It rotates with respect to it.

  In the main wire spring forming apparatus, a coil forming tool (not shown) that winds a wire rod without rotating the forming tool itself is attached on the slide unit 206 in place of the rotating unit 212. It can also be used. In such a case, the main joint 222 and the follower joint 223 on both sides of the arm in the universal joint mechanism 219 are removed from the main body of the spring molding apparatus, and then the arm 214 is rotated to the left or right by the above configuration to obstruct the work. Keep away from the situation.

  On the other hand, the slide structure of the slide unit 206 to which the rotation unit is attached will be described with reference to FIGS. 2, 5, 7, and 8. As a premise, with respect to the slide unit 206, the forward direction of the bending tool 213 is “front” and the direction of the cam follower 21 is “rear”, and the slide toward the center of the quill is “forward”. The slide in the direction is set to “retreat” (hereinafter referred to as this name).

  First, as shown in FIG. 7, outside the rotating table 204, the arc cam units 209 equal to or more than the number of the slide units 206 move the upper base plate 201 in order to move the target slide unit 206 forward and backward in the center direction of the quill 210. It is provided above.

  The structure of the arc cam unit 209 will be described with reference to FIGS. 7 and 8. The slide guide 32 (omitted in FIG. 7, see FIG. 8) on the unit support base 238 causes the slide plate 33 to quill along the elongated hole 33a. It is supported to be slidable in the center direction. An output shaft 35 that rotatably supports the cam 36 on the slide plate 33 is provided on the unit support 238 so as to penetrate the long hole 33a.

  Each cam 36 is rotated by a corresponding sliding servo motor 207 (see FIG. 2).

  Further, as shown in FIG. 5, a protrusion 239 is provided at the lower end of the slide unit 206, and the protrusion 239 has two coil springs 240 (two in this embodiment) whose one end is urged by the main body of the spring molding apparatus. It is biased to the other end. Here, as shown in FIG. 8A, the initial position of the cam follower 37 on the slide plate 33 is the minimum distance from the center of the output shaft 35 to the contact point with the cam follower 37 (hereinafter simply referred to as contact distance). It becomes a point. When the cam 36 rotates and the contact distance increases as shown in FIG. 8B, the slide plate 33 slides through the cam follower 37, the arc cam 39, and the cam follower 21 (see also FIGS. 5 and 7). The unit 206 is pushed to advance the coil spring 240 in the direction of the wire W on the molding stage while extending the coil spring 240. At this time, the tip of the bending tool 213 mounted on the slide unit 206 moves forward to the reference position where the wire rod W is mated according to the outer shape of the cam 36, and mates with the wire rod W fed from the tip of the quill 210. To form a wire spring.

  On the other hand, when the cam 36 rotates and the contact distance decreases, the slide unit 206 is moved backward by the urging force of the coil spring 240. At this time, the cam follower 37 on the slide plate 33 finally returns to the initial position while maintaining a state in contact with the outer periphery of the cam 36.

  Next, the actual molding state of the wire spring will be described with reference to FIGS. The tip shape of the bending tool 213 may be two types as shown in (a) and (b). In the case of (a), the wire W sent to the forming stage from the tip of the quill 210 is advanced to the reference position where the wire W is attached to the arc cam unit 209 and formed at the tip of the bending tool 213. Is engaged with the groove 123 a on the cored metal 123. In this state, when the drive servo motor 215 is driven to rotate the rotating body 125 with respect to the cored bar 123, the wire W hooked on the wire rod latching protrusion 125a on the rotating body 125 becomes the groove of the cored bar. Bending is performed with the end of 123a as a fulcrum.

  In the case of (b), the wire W is engaged with the groove between the cored bar 127 located at the center of the rotating body 125 and the wire rod projection 127a provided away from the center so that the wire passes. . When the rotating body 125 is rotated in the same manner as in (a), the wire W is bent and formed along the outer peripheral surface of the core metal 127 with the core metal 127 as a fulcrum.

  As described above, the wire spring molding apparatus according to the invention of the present application is very useful in terms of cost, expandability, improvement in the quality of the wire spring, and effects that result in maintenance.

The front view of the wire spring shaping | molding apparatus which concerns on an Example. The partial cross section side view showing the whole structure of a wire spring shaping | molding apparatus. The front view showing a rotational motion distribution mechanism. The partial cross section side view to which the rotation operation | movement distribution mechanism was expanded. The partial cross section side view which expanded the rotation unit periphery for bending molding. The partial cross section side view of an arm support part. The front view of an upper base. The mechanism explanatory drawing of an arc cam and a cam follower. (A) Explanatory drawing when a cam is located at a base point. (B) Explanatory drawing when a cam rotates and an arc cam advances to a reference position. (A) (b) The perspective view showing the bending molding tool front-end | tip part. The partial cross section side view showing the spring forming apparatus of a prior art. The partial cross section side view showing the rotation mechanism of the bending tool in a prior art.

Explanation of symbols

203 Pressure Feeding Roller 204 Rotating Table 210 Quill 212 Bending Molding Rotating Unit 213 Bending Molding Tool 214 Arm 214a Arm Supporting Section 215 Drive Servo Motor 216 Rotating Motion Distributing Mechanism 217 Main Drive Gear 218 Driven Gear 219 Universal Joint Mechanism 224 For Table Synchronization Servo motor 225 Main pulley 225a Drive belt 226 Driven pulley W Wire

Claims (4)

Bending molding rotation units arranged radially on the surface of the main plate constituting the molding stage, centered on the center line of the quill that feeds the wire to the molding stage via the pressure feed roller, and sent to the molding stage A bending tool provided on the bending molding rotation unit to bend the wire by abutting with the wire, and one or more bending moldings in conjunction with the rotation of one drive servo motor. A wire spring molding apparatus comprising an interlocking rotation mechanism that rotates all of the rotation units;
The wire spring forming apparatus, wherein the interlocking rotation mechanism is provided outside the wire spring forming apparatus and in front of the quill.   The interlocking rotation mechanism is opposed to the quill at the tip of the arm extended from the upper outside of the wire spring molding device toward the front of the quill, and with respect to the extension line of the center line of the quill. The drive servomotor arranged so that the axes of the rotation axes coincide with each other and installed in the drive servomotor in order to distribute and convert one rotation operation in the drive servomotor into a plurality of rotation operations A rotating motion distribution mechanism comprising a main driving gear and a plurality of gears assembled to the main driving gear, one end fixed to the driven gear, and the other end connected to the bending forming rotating unit. As a result, all the one or more bending forming rotation units are rotated in conjunction with the rotation operation of the main driving gear, and the number of bending forming rotation units is the same as the number of installation units. Wire spring molding apparatus according to claim 1 in which the transversal joint mechanism was comprising the.   3. The wire spring molding according to claim 2, wherein a base end portion of the arm is mounted to be rotatable with respect to a horizontal direction via an arm support portion above and outside the wire spring molding apparatus. apparatus.   The main plate constituting the molding stage is configured as a rotation table that can rotate around the center line of the quill, is provided separately from the drive servo motor on the arm, and rotates the rotation table. The table synchronizing servo motor that rotates in synchronization with the moving operation, the main driving pulley installed in the table synchronizing servo motor, and the rotating operation of the main driving pulley via the drive belt, The wire spring molding according to any one of claims 1 to 3, further comprising a driven pulley that integrally rotates the motion distribution mechanism and the universal joint mechanism around a central axis of the drive servo motor. apparatus.

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