JP3281553B2 - Tool operating device of coil spring making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool operating device for a coil spring manufacturing machine for forming a torsion coil spring, a tension spring and the like.

[0002]

2. Description of the Related Art In spring molding, a first hook portion, a first
Bend from hook to coil body, coil body, second
The forming of the rising portion of the hook portion, the second hook portion, and the like is performed by advancing and retreating the forming tool. In particular, a torsion coil spring has a complicated shape in which bending is made in various directions and the bending phases are different. Fabrication of the spring may be required, and the bending is performed using a number of forming tools from various directions.

When using a coil spring manufacturing machine in which the angle of the tool slide base for moving the forming tool forward and backward cannot be adjusted because the angle is fixed, the wire rod and the tool are aligned according to the shape of the tip of the tool. A suitable tool must be manufactured for each shape of the coil spring, and severe conditions are imposed on the shape of the tool, resulting in an increase in manufacturing costs, and a problem that it takes time to respond to a manufacturing decision.

In order to solve this problem, the present applicant has previously developed a spring forming apparatus known from Japanese Utility Model Publication No. 3-57312. A tool operating device 101 of this spring forming device has a unit base 103 attached to a tool mounting frame 102 provided on a machine base (not shown) as shown in FIGS. A tool operation table 104 is slidably mounted on a guide in the direction of the quill axis on the upper surface of the unit table 103, and a stepped operation cylinder 105 is provided on an upper portion of the tool operation table 104.
Are rotatably mounted around a rotation axis concentric with the quill axis.

The operating rod 1 is inserted into the hole of the small diameter portion of the stepped operating cylinder 105.
06 is rotatably and axially movably supported, and the spindle 1 is inserted into a deep groove 105a cut in a large diameter portion of the stepped operation cylinder 105.
The tool holder 108 sliding at 07 is pivotally supported. The forming tool T is attached to the tool holder 108, the tool holder 108 is connected to the operating rod 106 by the connecting plate 109, and the swinging end is regulated by the positioning bolt 110.

A cam follower 110 is pivotally supported at the rear end of the tool operation table 104, and a lever stand 111 is established on the upper surface. An L-shaped lever 112 is pivotally supported by a support shaft 112b. Sliding piece 11 under the arm
2a is rotatably attached by bolts, and a sliding piece 112a is
It is slid into the long groove 113a on the upper surface.

An air cylinder 114 is fixed on the protruding plate 103a of the unit base 103, and the lever 115 and the L-shaped lever 112 are connected by a rod 116 so that the tool holder 108 swings by the expansion and contraction of the piston rod 114a. ing.

Further, a mounting hole 102a of the tool mounting frame 102 is provided.
A cam shaft 117 having a composite cam 118 is rotatably mounted on an upper end of a bearing housing 124 attached to the
A lever 119 for transmitting the displacement of the composite cam 118 to the cam follower 110 is pivotally supported on the tool mounting frame 102,
Springs 120, 120 for keeping the connection surfaces of the cam follower 110, the lever 119, and the composite cam 118 in contact at all times are stretched.

The above-mentioned stepped operation cylinder 105 is driven by one of the large gears (not shown) via a gear train from a small gear 121a to a gear 121f, and the tool operation table 104 is driven by another slide. Cam 11 rotated via a small gear 122 by the other large gear shared with
8 is performed.

[0010]

In the technique disclosed in Japanese Utility Model Publication No. 3-57312 described in the prior art, since only one forming tool can be attached to the tool holder, a wide range of forming cannot be performed. Since the movement in the direction is performed by the cam, there is a problem that it takes time to adjust the molding timing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. It is an object of the present invention that a plurality of forming tools can be attached, and each forming tool can be arbitrarily selected. An object of the present invention is to provide a tool operating device driven by an NC control device that can perform various types of forming and can easily adjust the forming timing.

[0012]

In order to achieve the above-mentioned object, a tool operating device of a coil spring manufacturing machine according to the present invention is provided with a tool which abuts a wire fed from a quill to a torsion coil spring and a tension coil spring. A tool operating device of a coil spring manufacturing machine for forming a quill, wherein a quill axis direction and a horizontal direction perpendicular to the quill axis are respectively provided on a front surface of the quill.
Tool holder and quill axis of the tool holder having a plurality of tool detachably on the perpendicular plane to the quill axis in front of the quill, respectively retractably provided in three axial directions of the lead straight direction a first driving means which can advance and retreat positioning direction, advance and retract the tool holder and a second drive means which can advance and retreat positioning in the horizontal direction perpendicular quill axis, the tool holder to the quill axis perpendicular lead straight direction A third drive unit capable of positioning, and an NC control device for controlling the first drive unit, the second drive unit, and the third drive unit individually or simultaneously, and performing NC control at each operation conversion point of the forming process. The apparatus controls the tool holder in three axes to select a tool and perform advance / retreat positioning in three axis directions.

According to the above-described tool operating device of the coil spring manufacturing machine, the tool holder provided with a plurality of tools can be moved back and forth in the quill axis direction (Z-axis direction) and can move in the horizontal direction (X-axis) perpendicular to the quill axis. retractable and quill axis perpendicular lead <br/> direction) to allow advance and retreat in a straight direction (Y axis direction), since to carry out the forward and backward positioning control each axis independently or simultaneously by the NC control device, be molded Arbitrarily select a suitable forming tool from among a plurality of forming tools having different forming angles in accordance with the forming direction of the coil spring, and perform various formings by advancing and retreating positioning of each axis of X, Y, Z axes. The adjustment of the molding timing can be performed very easily and in a short time by the program.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tool operating device for a coil spring manufacturing machine according to the present invention will be described below with reference to the drawings. 1 is a front view of the coil spring making machine, FIG. 2 is a side view of the coil spring making machine, FIG. 3 is a top view of the coil spring making machine, and FIG. 4 is cut and bent along the line AA in FIG. 5 (a) is a sectional view taken along line BB of FIG. 4, FIG. 5 (a) is a sectional view taken along line CC of FIG. 4, and FIG. Enlarged view of main part with unit, FIG. 7
Is a three-view drawing of the tool holder with the control axis direction added thereto, and FIG.
It is a block diagram of C control device.

1 to 3, a cutting is performed on a machine base 1,
A unit mounting frame 2 for bending and a box frame 3 behind the unit mounting frame 2, and a large gear 4 (indicated by a dashed-dotted circle in FIG. 1) for driving the cutting and bending unit 20 are mounted on the unit mounting frame 2. A reduction gear 5 for rotating the large gear 4 is attached to the unit mounting frame 2, and a servo motor 6 for driving the reduction gear 5 is mounted on the box frame 3. And a pair of upper and lower feed rollers 7A,
Reduction gear 8 to rotate the 7B, servo motor 14 is provided for driving the large gear 4 meshed with the drive gear 13 is deposited preparative rotation therewith by a key to the output shaft of the reduction gear 5,
The rotation of these servo motors 6 and 14 is controlled by an NC device (not shown).

A quill 10 for guiding a wire on the center line of the large gear 4 is mounted on the front surface of the unit mounting frame 2 via a quill holder 9, and a feed roller 7 is positioned above the quill axis.
A and 7A are provided with feed rollers 7B and 7B at a lower position, and the feed rollers 7A and 7A at an upper position are pressurized via a lever 12 by an air cylinder (not shown).
Then, the wire bundled in a coil shape is sandwiched between upper and lower feed rollers 7A and 7B and sent out from the quill 10.

The cutting and bending unit 20 is shown in FIGS.
As shown in, unit unit having the same shape on the front of the mounting frame 2 are two sets, cut not shown on lead direct-axis (Y-axis) passing through the quill axis, as bending tool is movable back and forth in the radial direction quill 10 It is installed symmetrically up and down with.
The support base 15 of the cutting / bending unit 20 has guides 16 in the Y-axis direction on the upper surface, and a movable body 17 is slidably inserted into the guides 16, 16, and cut on the quill side of the movable body 17. A tool mount 18 for bending is attached, and a connecting stand 19 is attached outside the tool mount 18.

A bearing housing 2 in which a rear end portion is loosely inserted into a hole 2a of the unit mounting frame 2 is inserted into a projecting portion 15a of the support base 15.
1 is mounted at right angles to the mounting surface and the bearing housing 2
A gear shaft 22 is rotatably mounted on the gear shaft 1 via a plurality of bearings, and a small gear 23 meshing with a large gear is provided at a rear end of the gear shaft 22 protruding from the unit mounting frame 2 by a key.
Is the body rotatably preparative wearing, the cam 24 on the tip portion of the gear shaft 22
Is detachably attached.

Further, a bearing housing 21 is
, A support shaft 25 is erected at right angles to the mounting surface, and an arm 26 is pivotally supported by the support shaft 25 at a rear end portion thereof, and a cam follower 27 is pivotally supported substantially at the center. Have been. A sliding piece 28 has a bolt 29 at the tip of the arm 26.
The sliding piece 28 is slidably engaged with a groove 19a formed in the upper surface of the connecting base 19 and perpendicular to the Y axis.

Guides 16 in the Y-axis direction on the support 15
Spring support shafts 31 and 31 are screwed at right angles to the outer end of the arm, respectively, and the spring support shafts 32 and 32 are also screwed at right angles to the tool mounting base 18 via the flat plate 36, and further, a position closer to the tip of the arm 26. The spring support shaft 33 is also screwed at right angles,
A spring 34 for urging the arm 26 directly clockwise so that the cam follower 27 always contacts the cam curved surface of the cam 24.
And a spring 3 for urging the arm 26 clockwise through the sliding piece 28 and urging the moving body 17 radially outward.
5 and 35 between the spring support shafts 31 and 33 and the support shaft 3
It is stretched between the opposing members 1, 31 and 32, 32, respectively.

Further, on the front surface of the unit mounting frame 2, as shown in FIGS. 1 and 2, a rail mounting base 2b is provided so as to protrude from an upper end and a lower end thereof.
A pair of linear guides 3 vertically above and below the quill axis
The guide rails 39A, 39A of 9 and 39 are fastened horizontally (in the X-axis direction) by a plurality of bolts.
A saddle 41 to which the slide portions 39B, 39B of 9, 39 are attached is mounted so as to be able to advance and retreat in the X-axis direction along the guide rails 39A, 39A. The unit mounting frame 2 has ball screws 44 parallel to the outside of the guide rails 39A and 39A.
A and 44B are rotatably supported, and the saddle 41 has a ball screw nut 44 screwed to the ball screws 44A and 44B.
a, 44b are fixed.

Pulleys 45, 46 are arranged side by side on the projecting end of the upper ball screw 44A so as to be integrally rotatable by a key, and the pulley 47 is attached to the projecting end of the lower ball screw 44B.
There have been integrally rotatable preparative wearing by a key, synchro belt 4 between the upper pulley 45 and lower pulley 47
8 are stretched, also the pulley 49 is integrally rotatable preparative wear by the key to the output shaft 42a of the X-axis servo motor 42 of the fixed to an upper surface of the unit mounting frame 2 as shown in FIG. 3 Synchronous belt 43 between pulley 46
Is stretched.

As shown in the enlarged view of FIG. 6, a pair of linear guides 51, 51 (FIG.
Guide rails 51A of the reference), 51A is fastened to the lead straight (Y axis direction) by a plurality of bolts, the linear guide 51,
A box body 52 to which the slide portions 51B of the 51 are fixed.
Are provided so as to be able to advance and retreat in the Y-axis direction along the guide rails 51A, 51A. A ball screw 53 is rotatably mounted on the saddle 41 in parallel with the center between the guide rails 51A, 51A. The ball screw 53 is connected to an output shaft of a Y-axis servomotor 55 fixed to the saddle 41 and a coupling 54.
And a ball screw nut 53 a screwed to the ball screw 53 is fixed to the box 52.

Guide rails 60A, 60A of a pair of linear guides 60, 60 are fastened to the side surface of the box 52 on the quill 10 side by a plurality of bolts in the quill axis direction (Z-axis direction). Slide part 60B, 6
The upper base 56 to which the OB is fixed is connected to the guide rails 60A and 60A.
It is provided movably in the Z-axis direction along 0A. Guide rails 60A to the box 52, the center parallel to the ball screw 62 which is sandwiched 60A is axially supported rotatably, are integrally rotatable preparative wear pulley 57 by a key at its projecting end, the box 52 Output shaft 5 of Z-axis servo motor 58 fixed to
Synchro belt 61 is stretched between the pulley 57 and the pulley 59 are integrally rotatable preparative deposited by key 8a.

The elevator prismatic central axis 64 of the tool holding bearing member 70 in the Z-axis direction of the mounting guide grooves 56a which are engraved on the surface center 56 is fastened by a plurality of bolts. As shown in FIG. 7, the tool holder 70 has a square center axis 64 and a square fixed to the end of the square center axis 64 (square in this embodiment, but depending on the number of forming tools to be described later, it is rectangular, polygonal, or circular). But it from the tool holding plate 65. good), and lead straight to the tool holding plate 65 (not shown) of the two X-axis direction, left and right distance from the center point of the rectangular central axis 64, prismatic central axis 64
A total of eight intersections of four intersections with two horizontal lines (not shown) equidistant from the center point in the Y-axis direction and the center of each intersection.
A plurality of tool holding tapered holes 65a are formed at right angles to the plane. In this example, the mutual positional relationship including the center axis 64 of the eight tapered holes is arranged at a fixed distance so as to be easily programmed, but it is not always necessary, and the number is not limited to eight. Is also good.

As shown in FIG. 7 (c), the tool holding tapered hole 65a is formed in a tapered hole having a wide tool insertion opening, and includes a right-hand forming tool T1, a left-hand forming tool T2, and a bending forming tool. T3a and T3b are fastened by bolts 66 so that they can be attached and detached and their mounting angles can be adjusted according to the wurtz forming direction. Note that the arrangement of the forming tools in FIG. 7 is an arrangement corresponding to an example of forming the torsion spring W in the operation described below.

In the tool operating device 40 configured as described above, a tool holder 70 having a plurality of forming tools T1, T2, T3a, and T3b is driven by an X-axis servomotor 42 so that an X-axis perpendicular to the quill axis and horizontal. axially retractable positioning and retreat positioning with a retractable positioning in the Y-axis direction perpendicular and lead straight and quill axis by Y-axis servo motor 55, the Z-axis direction parallel to the quill axis by the Z-axis motor 58 The rotation of each of the axis servomotors 42, 55, 58 can be controlled independently or simultaneously by the NC controller 80.

FIG. 8 shows the servomotors 42, 55, 58 for each axis.
FIG. 3 is a block diagram showing an NC control system of an NC control device 80 that controls the rotation of the robot. The input section 71 is a section for inputting a machining program or necessary information from the outside, the program storage section 72 is a section for storing the inputted machining program, etc., and the program interpreting section 73 interprets the program contents and outputs signals to necessary places. The sorting section, the function generating section 74 generates a function for controlling the rotation of each axis based on the command of the program, the X-axis power amplifying section 75 is connected to the X-axis servomotor 42, and the Y-axis power amplifying section 76 is provided. Is a portion for supplying drive power to the Y-axis servomotor 55, and the Z-axis power amplifier 77 is a portion for supplying drive power to the Z-axis servomotor 58, respectively.

Next, the operation of the tool operating device 40 of the present embodiment will be described with reference to the forming tools T1, T2, T2 arranged as shown in FIG.
An example in which the torsion coil spring W shown in FIG. 9 is formed by T3a and T3b will be described in the order of the flowchart of FIG. 14 with reference to the operation explanatory diagrams of FIGS. In addition, the front view of the tool holding plate 65 with respect to the quill 10 in each operation explanatory diagram shows the positional relationship between the quill 10 and each forming tool used for the forming process in the X and Y axis directions. 3 shows the positional relationship mainly in the Z-axis direction when the movement of the forming tool in the X and Y-axis directions is viewed from a direction perpendicular to the quill 10, and the forming tool viewed from a direction different from the 90-degree direction as necessary. Is attached. Further, reference numerals (1) to (12) shown in FIG.
0 to 13 correspond to the reference numerals (1) to (12) shown in FIG.

In step S1, the feed rollers 7A,
7B is rotated to feed the wire rod as shown in FIG. 10A, and the linear portion Wa of the first hook of the coil spring W shown in FIG.
Is sent from the tip of the quill 10 to the forming area. In step S2, one bending forming tool (referred to as a bending tool in the flowchart) T3a attached to the lower right corner of the tool holding plate 65 previously positioned at the standby position near the quill is moved to the tool holding plate 65. Of the first hook shown in FIG. 10 (2) by advancing in the Z-axis direction after bending the wire by obliquely moving to the upper right by combining the X-axis direction and the Y-axis direction, thereby bending the wire rod. The portion Wb is bent.

Next, in step S3, FIG.
As shown in (3), after one bending forming tool T3a is retracted in the Z-axis direction and separated from the wire, the tool holding plate 6
By moving X5 rightward on the X axis, the adjacent bending forming tool T3b is positioned at the standby position instead of the forming tool T3a. In step S4, the feed roller 7
A and 7B are rotated, the wire is fed out by a set amount, and the linear portion Wc of the first hook is fed out of the quill 10 into the processing area, and the state shown in FIG.

Next, in step S5, after the wire is bent by moving the forming tool T3b rightward on the X-axis,
By moving forward in the Z-axis direction, the bent portion Wd of the first hook is formed by bending, resulting in the state shown in FIGS. 11 (5) and 11 (6). In step S6, after the forming tool T3b is retracted in the Z-axis direction and separated from the wire, the right-handed forming tool to be used next by lowering the tool holding plate 65 in the Y-axis direction (referred to as a right-handed tool in the flowchart). ) T1 is positioned at the standby position, and in step S7, the feed rollers 7A and 7
B is rotated to send out the wire, and the rising straight portion We of the first hook is sent out from the quill 10 to the processing area, and the state shown in FIG.

Next, in step S8, the right-handed forming tool T1 is lowered in the Y-axis direction, and the forming surface of the forming tool T1 is positioned at the coiling position. In step S9, the wire is continuously fed out and the coil cylinder is fed. When the coiling of the portion Wf is performed and the state shown in FIG. 12 (8) is completed, and the coiling is completed, in step S10, the right-handed forming tool T1 retreats in the Z-axis direction and separates from the wire, and then the tool holding plate 65 The left-handed forming tool T2 to be used next (referred to as a left-handed tool in the flowchart) is positioned at the standby position by moving the X-axis leftward direction, and in step S11, the left-handed forming tool T2 advances forward in the Z-axis direction and continues. FIG. 12 shows a state in which the hook is positioned at a predetermined forward position for bending.
The state of (9) is reached.

Then, in step S12, the wire is fed out, and the straight portion Wg of the second hook rising is fed out of the quill 10 to a state shown in FIG. 13 (10). In step S13, the left-handed forming tool T2 is moved in the Y-axis direction. Then, it is positioned at the hook bending start position and the state shown in FIG. Next, step S1
In 4, the wire is fed out, and at the same time, the R-shaped bending of the hook bending portion Wh of the second hook is performed by the retraction and advance of the left-handed forming tool T2 in the Z-axis direction and the upward movement in the Y-axis direction.

Next, in step S15, after the left-hand forming tool T2 is retracted in the Z-axis direction, one of the forming tools T3a is bent by moving the tool holding plate 65 diagonally upward and left by combining the X and Y-axis directions. In step S16, the wire is fed out and the hook R bending end portion of the hook bending portion Wh is fed out of the quill 10 in preparation for forming the next torsion coil spring W at the standby position shown in 10 (1). Then, in step S17, the torsion coil spring W is cut off from the wire rod by the cutting tool T4 of the cutting and bending unit 20. Next, in step S18, it is confirmed whether or not the continuous operation is performed. If YES, the process returns to step S1, and if NO, the process ends.

The above operation has been described with reference to the example of forming the torsion coil spring W shown in FIG. 9. However, not only a tension spring having hooks at both ends but also a coil spring having a complicated shape can be formed by a three-axis NC program. It is possible to perform molding while arbitrarily selecting a tool to be used from a plurality of tools by control.

[0037]

Since the present invention is configured as described above, the following effects can be obtained. A tool holder provided with a plurality of forming tools detachably attached to a predetermined position and capable of adjusting a forming angle in accordance with a forming direction of a workpiece is provided in a Z-axis direction parallel to a quill axis by first driving means (Z-axis servomotor or the like). When the X-axis direction horizontally and a second drive means quill axis by (X-axis servomotor other) perpendicular, to the Y-axis direction of the third drive means (Y-axis servomotor) lead straight with quill axis perpendicular by It is possible to advance and retreat in three axis directions, and NC is used for each operation conversion point of molding by independent or simultaneous control of each axis by the NC controller.
Since the forming process is performed by arbitrarily selecting a forming tool according to the forming direction of the workpiece by the C program, high-speed forming is possible by arranging the forming tools rationally on the tool holding plate. It is possible to adjust the initial tension and adjust the initial tension using a program, so no time is required for adjustment. This is effective not only for forming springs of complicated shapes, but also for forming various types of small amounts of springs. Is also effective.

[Brief description of the drawings]

FIG. 1 is a front view of a coil spring manufacturing machine.

FIG. 2 is a side view of the coil spring manufacturing machine.

FIG. 3 is a top view of the coil spring manufacturing machine.

FIG. 4 is a front view of a cutting and bending unit section taken along the line AA of FIG. 2;

5A is a cross-sectional view taken along line BB of FIG. 4, and FIG. 5B is a cross-sectional view taken along line CC of FIG.

FIG. 6 is an enlarged view of a central portion of FIG. 1 and is a front view of a main part of a tool operating device and a cutting and bending unit.

FIGS. 7A to 7C are three views of the tool holding portion of the tool holding body with an axis control direction.

FIG. 8 is a block diagram of an NC control device.

FIGS. 9A and 9B are two side views of the torsion coil spring cited in the operation description.

10 is an explanatory diagram of a torsion spring forming operation corresponding to the flowchart of FIG.

11 is an explanatory diagram of a torsion spring forming operation corresponding to the flowchart of FIG.

12 is an explanatory diagram of a torsion spring forming operation corresponding to the flowchart of FIG.

13 is an explanatory diagram of a torsion spring forming operation corresponding to the flowchart of FIG.

FIG. 14 is a flowchart for explaining the operation.

FIG. 15 is a sectional view of a conventional spring forming apparatus.

16 is a plan view showing the conventional spring forming apparatus of FIG. 15 attached to a tool mounting frame.

[Explanation of symbols]

 Reference Signs List 1 machine base 2 unit mounting frame 3 box frame 4 large gear 7A, 7B feed roller 10 quill 15 support base 17 moving body 18 tool mounting base 20 cutting and bending unit 24 cam 26 arm 39, 51, 60 linear guide 40 tool operating device 41 Saddle 42 X-axis servomotor 44A, 44B, 53, 62 Ball screw 52 Box 55 Y-axis servomotor 56 Upper stage 58 Z-axis servomotor 65 Tool holding plate 70 Tool holder 80 NC controller

(56) References JP-A-9-85377 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21F 35/02 B21F 3/027

Claims (1)

(57) [Claims] 1. A tool operating device of a coil spring manufacturing machine for forming a torsion coil spring, a tension coil spring, and the like by abutting a tool against a wire fed from a quill, wherein a quill axial direction is provided on a front surface of the quill. quill axis in front of the quill, respectively retractably provided in three axial directions of the respective horizontal and lead straight direction perpendicular to the quill axis and
A tool holder in which a plurality of tools are detachably provided in a plane perpendicular to the line, first driving means capable of positioning the tool holder in the quill axis direction, and a tool holder which is perpendicular to the quill axis. horizontal and second drive means for the retractable positioning direction, and a third drive means which can advance and retreat positioning the tool holder in the quill axis perpendicular lead straight direction, the first drive means,
An NC control device for controlling the second drive means and the third drive means independently or simultaneously, and the NC control device controls three axes of the tool holder at each operation conversion point of the forming process to select a tool and A tool operating device for a coil spring manufacturing machine, which performs forward / backward positioning in three axial directions.