JPH1076340A - Tool operating device of coil spring making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily select a plurality of tools attached to a tool holder and to perform a tool operation of a coil spring manufacturing machine for forming various shapes by an operation including rotation of each control shaft. Provision of equipment. SOLUTION: A unit body 41 provided on a machine base 1B so as to be able to advance and retreat in the quill axis direction by an NC-controlled Z-axis servomotor 42 is provided with a tip of a rotation shaft 45 concentric with the axis of the quill 10. A large face plate 46 is attached, and a tool holding plate 54 provided with a plurality of tools around a vertical shaft 56 is provided at an eccentric position of the large face plate 46 on an attached gear box 60 so as to be rotatable. The tool holding plate 54 is rotated by the C-axis rotation about the quill axis by the axis motor 52 and the B-axis rotation about the vertical axis 56 perpendicular to the quill axis by the NC control B-axis motor 65. -By rotating the C-axis and moving the unit body 41 in the Z-axis direction by the Z-axis motor, a plurality of tools can be selected to form a coil spring having a complicated shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a torsion coil spring,
The present invention relates to a tool operating device of a coil spring manufacturing machine for forming a tension coil spring or 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 it is fixed, the wire rod is aligned with the tool depending on 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.
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 the quill can be moved back and forth in the quill axis direction at the front face thereof, can rotate around the quill axis, and rotate around a vertical axis orthogonal to the quill axis. A tool holder, which is provided so that a plurality of tools can be detachably provided around the vertical axis in a plane including the quill axis, and a first driving means capable of positioning the tool holder in the quill axis direction. A second driving means capable of rotating and positioning the tool holder about a quill axis, and a second driving means capable of rotating and positioning the tool holder about a vertical axis orthogonal to the quill axis. A drive means, said first drive means, second drive means, and controls the third drive means.

According to the above-described tool operating device of the coil spring manufacturing machine, the tool holder having a plurality of tools can be advanced and retracted in the quill axis direction (Z axis), and can be rotated about the quill axis (C axis rotation). NC) and can rotate (B-axis rotation) around a vertical axis (Y-axis) perpendicular to the quill axis.
Since the position control of each axis is performed by the control device, the switching of the B-axis direction and the rotation positioning can be freely performed, and a plurality of forming tools are selected by a program to perform various forming operations including the B-axis rotation. It is possible to do. In addition, since the molding timing can be adjusted by a program, it can be performed extremely easily and in a short time.

[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 side view of the entire coil spring manufacturing machine, FIG. 2 is a view seen from the direction of the arrow A in FIG. 1, FIG. 3 is a sectional view taken along the line BB in FIG. 2, and FIG. FIG. 5A is a sectional view taken along the line DD in FIG. 4, and FIG. 5B is a sectional view taken along the line EE in FIG. 4. 6 is a cross-sectional view of a main part of the tool operating device and the coil spring manufacturing machine, FIG. 7 is a cross-sectional view taken along the line FF of FIG. 6, and FIG. FIG. 4 is an explanatory view of a control shaft of the tool operating device.

In FIG. 1 and FIG. 2, a machine base 1 is formed by integrally forming a machine base 1A for the machine and a machine base 1B for a tool operating device. A folding unit mounting frame 2 and a box frame 3 behind it are provided. As shown in FIG. 3, a large gear 4 for driving the cutting / bending unit 20 is rotatably mounted on the unit mounting frame 2 about the quill axis. A speed reducer 5, a servo motor 6 for driving the speed reducer 5, a speed reducer 8 for rotating a pair of upper and lower feed rollers 7A and 7B, and a servo motor (not shown) for driving the speed reducer 5 are built in. A drive gear 13 meshing with the large gear 4 is keyed to 5a, and the rotation of these servo motors is controlled by an NC controller (not shown).

A quill 10 for guiding a wire on the center line of the large gear 4 is mounted on a front surface of the unit mounting frame 2 via a quill holder 9, and a feed roller 7 A is located above the quill axis and a feed roller 7 A is located below the quill axis. A feed roller 7B is provided,
The upper feed roller 7A is an air cylinder 11 shown in FIG.
Is pressed through the lever 12. Then, the wire bundle bundled in a coil shape is straightened by a straightening mechanism (not shown), and the straight wire is fed to upper and lower feed rollers 7.
A, 7B and send out from the quill 10.

The cutting and bending unit 20 is shown in FIGS.
As shown in the figure, two sets of units having the same shape are mounted on the front surface of the unit mounting frame 2, and the quill 10 is mounted on a vertical axis (Y axis) passing through the quill axis so that a cutting and bending tool (not shown) can advance and retreat in the radial direction. It is installed symmetrically up and down. The support 15 of the cutting / bending unit 20 has guides 16 in the Y-axis direction on the upper surface, and a movable frame 17 is slidably mounted on the guides 16, 16.
On the quill side, a cutting and bending tool mounting table 18 is attached, and a connecting table 19 is mounted outside the tool mounting table 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 through a plurality of bearings, and a small gear 23 meshing with the large gear 4 is keyed to a rear end of the gear shaft 22 protruding from the unit mounting frame 2. A cam 24 is detachably attached to the tip of the gear shaft 22.

Further, a bearing housing 21 is
, A support shaft 25 is erected at right angles to the mounting surface, and the arm 26 is pivotally supported at the rear end by the support shaft 25, and a cam follower 27 is rotatable substantially at the center. It is pivoted. A slide piece 28 is provided at the tip of the arm 26 with a bolt 29.
The sliding piece 28 is slidably engaged with a groove 19a formed on the upper surface of the connecting table 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 ends of the spring support shafts.
32 is screwed at a right angle, and a spring support shaft 33 is screwed at a right angle also at a position near the tip on the arm 26, and the arm 26 is moved so that the cam follower 27 always contacts the cam curved surface of the cam 24. A spring 34 directly biasing clockwise;
A spring 35 for urging the arm 26 in the clockwise direction via the sliding piece 26 and urging the movable table 17 radially outward;
35 and between the spring support shafts 31 and 33 and the spring support shaft 3.
It is stretched between the opposing members 1, 31 and 32, 32, respectively.

On the other hand, on the machine base 1B, as shown in FIGS. 6 and 7, a unit body 41 having respective slide portions 39A, 39B of the linear slides 39, 39 on both lower surfaces.
Are mounted so as to be able to advance and retreat. The unit main body 41 is advanced and retracted by a ball screw 44 rotated via a synchro belt 43 by a Z-axis servo motor 42 fixed to the machine base 1B.

A hollow rotating shaft 45 is rotatably mounted on the unit main body 41 by a plurality of bearings so as to be concentric with the quill axis. A large face plate 46 is mounted concentrically, and a worm wheel 47 is keyed at the center. As shown in FIG. 7, a gear shaft 48 is vertically rotatably supported in the vicinity of the worm wheel 47 on the unit main body 41, and a worm 49 that meshes with the worm wheel 47 is keyed to the gear shaft 48. A C-axis servomotor 52 is fixed to the lower surface of the unit body 41 via a support 51 concentrically with the gear shaft 48, and the output shaft 52 a of the C-axis servomotor 52 is connected to the gear shaft 48 via a coupling 53. Are linked.

A gear box 60 for a tool holder 50, which will be described later, is mounted on the surface of the large face plate 46 facing the quill 10 at an eccentric position away from the center. A vertical axis 56 is rotatably erected on a Y axis orthogonal to the passing Z axis, and a worm wheel 55 is keyed so as to be rotatable about the vertical axis 56. A tool holding plate 54 is fastened to the vertical shaft 56 by a plurality of bolts at an upper end surface thereof slightly protruding from a hole 60a of a gear box upper plate.

The tool holding plate 54 is formed in a triangular shape (a triangular shape in the present embodiment, but a polygonal shape or a circular shape depending on the number of forming tools described later) as shown in FIGS. On the upper surface, a long groove 54a is radially engraved on the upper surface at equal intervals along the three triangular protrusions, and a right-hand forming tool T1, a left-hand forming tool T2, and a bending forming are formed in the long groove 54a. Each of the tools T3 has a bolt 57
As a result, the molding surface is detachably fastened so as to coincide with the quill axis.

A gear shaft 61 is rotatably supported in the unit main body 41 through a plurality of bearings in a center hole of the rotation shaft 45, and a gear 62 is attached to a tip (quill side end) of the gear shaft 61.
Are keyed, and a driven pulley 63 is keyed at the rear end. The gear shaft 61 is supported on the unit body 41 via a support 64.
The output shaft 65a of the B-axis motor 65 fixed in parallel with
Drive pulley 66 and the driven pulley 63
A synchro belt 67 is stretched between them.

As shown in FIG. 8C, a gear shaft 6 is rotatably mounted in the gear box 60 near the worm wheel 55 at a right angle.
8, a worm 69 meshing with the worm wheel 55 is keyed to the gear shaft 68, and a gear 70 meshing with the gear 62 is keyed to an end of the gear shaft 68.

The tool operating device 40 configured as described above includes a plurality of forming tools T1, T2, as shown in FIG.
The tool holder 50 having T3 is moved to the B-axis servomotor 65
Is rotated about a vertical axis 56 perpendicular to the quill axis, is rotatable about the quill axis by the C-axis servomotor 52, and is movable back and forth in the quill axis direction (Z-axis direction) by the Z-axis motor 42. The B-axis servomotor 65, the C-axis servomotor 52, and the Z-axis servomotor 42 are all driven by an NC controller 80 described later.

However, when the tool holder 50 rotates around the quill axis (C-axis rotation), the gear 70 meshing with the gear 62 rotates to rotate the tool holding plate 54. The B-axis servomotor is rotated in synchronism with the C-axis servomotor 52 so that the gear shaft 61 and the gear 62 rotate integrally with the rotation shaft 45 and the large face plate 46 to prevent the gear from rotating. .

FIG. 10 shows each of the servomotors 65, 52, 42.
FIG. 3 is a block diagram of an NC system of an NC control device 80 that controls the rotation of the robot. The input unit 71 is a unit for inputting a program or information from the outside, the program storage unit 72 is a unit for storing the input program, a program interpreting unit 73
Is a part for interpreting the contents of the program and sorting the signals into necessary parts, a function generator 74 is a part for generating a function for controlling each axis based on a program command, and a B-axis power amplifier 75 is a B-axis servo motor 65. In addition, the C-axis power amplifier 76 is connected to the C-axis servo motor 52 and the Z-axis power amplifier 77.
Are portions for supplying drive power to the Z-axis servo motor 42, respectively.

Next, the operation of the tool operating device 40 according to the present embodiment will be described with reference to FIGS. 12, 13 and 14 for the examples of forming the torsion coil spring W shown in FIG. Will be described in the order of the flowcharts. However, the top views of the tool holding plate 54 shown in the drawings for explaining the operation are all in the direction corresponding to the C-axis rotation angle of the tool holding plate 54 when the quill 10 is viewed from behind the tool operating device 40. ing.
Also, the reference numerals (1) to (9) shown in FIG. 11 correspond to the reference numerals (1) to (9) shown in FIGS.

In step S1, the feed rollers 7A and 8A are rotated to feed the wire as shown in FIG. 12A, and the straight portion Wa of the first hook of the torsion coil spring W shown in FIG. Sent from 10 tips. In step S2, the tool holding plate 54 of the tool holding body 50 is controlled in advance to rotate the C-axis about 30 degrees counterclockwise (counterclockwise) with respect to the horizontal plane, and the forming tool T3 for bending (referred to as a bending tool in the flowchart). Is in the standby position near the quill 10 and the tool holding plate 54 whose B-axis rotation is controlled
Then, in step S3, the forming tool T3 abuts on the base of the wire protruding from the quill 10 and bends the wire in the clockwise direction (clockwise rotation) of the B axis in step S3. Forward in the direction of FIG.
As shown in (2), the R-shaped bent portion Wb of the first hook is formed.

Next, in step S5, the forming tool T
3 is retracted from the wire in the Z-axis, and in step S6, the tool holding plate 54 is rotated to the left by the B-axis to return the forming tool T3 to the original position, and further rotated to the right by the C-axis to make the tool holding plate 54 horizontal. At the same time, the feed rollers 7A and 8A are rotated, the wire is fed out by the set amount, and the straight portion Wc of the first hook is fed out of the quill 10, and the state shown in FIG.

Next, in step S7, the forming tool T
3 is advanced in the Z-axis direction again, the tool holding plate 54 is rotated rightward by the B-axis in step S8, and the wire is bent by the circular motion of the forming tool T3. In step S9, the wire is advanced again in the Z-axis. The bent portion Wd of one hook is formed, and the state shown in FIG.

Next, in step S10, after the forming tool T3 is retracted in the Z-axis direction and separated from the wire, in step S11, the right-hand forming tool T1 is rotated by rotating the tool holding plate 54 left on the B-axis (right in the flowchart). (Referred to as a winding tool) is positioned at the standby position near the quill 10, and at the same time, the tool holding plate 54 is rotated rightward by the C-axis to become vertical. In step S <b> 12, the wire is fed out and the linear portion We of the first hook rises. It is sent out from the quill 10 and becomes a state shown in FIG.

Next, in step S13, the forming surface of the forming tool T1 is positioned at the coiling position by the right rotation of the tool holding plate 54 in the B-axis direction. In step S14, the wire is continuously fed out to perform coiling of the coil cylinder Wf. As a result, the state shown in FIG.

Next, in step S15, the forming tool T1 is separated from the coiling position by the left rotation of the tool holding plate 54 in the B-axis, and the forming tool T2 for left-hand winding (referred to as a left-hand tool in the flowchart) approaches the quill 10 instead. In S16, the forming tool T2 advances in the Z-axis and is positioned at the standby position for the next hook bending. In step S17, the wire is sent out, and the rising straight portion Wg of the second hook is sent out from the quill.
The state shown in (7) is obtained.

Next, in step S18, the tool holding plate 54 is rotated to the left along the B-axis to be positioned at the hook bending position, and in step 19, the wire is fed out and the hook bending portion Wh of the second hook is bent and formed. 14 (8)
The state shown in FIG.

Next, in step S20, the forming tool T2 is retracted in the Z-axis, separated from the wire and returned to the standby position,
In step S21, the tool holding plate 54 is rotated to the left on the B-axis to position the forming tool T3 at the standby position shown in FIG. 12A near the quill 10, and at the same time, the tool holding plate 54 is rotated to the left on the horizontal plane. Turning left by about 30 degrees,
2 (1), the next torsion coil spring W
In step S22, the wire is fed out, and in step S23, the wire is cut by the cutting tool T4 of the cutting and bending unit 20 to separate the torsion coil spring W from the wire.

Then, in step S24, it is confirmed whether or not the operation is continuous. If YES, the process returns to step S1, and if NO, the process ends. The above operation is described in FIG.
Although the example of forming the torsion coil spring W shown in FIG. 5 has been described, the present invention is also effective for forming the coil spring W3 having a complicated shape shown in FIG. 17 as well as the tension spring W2 shown in FIG.

[0040]

Since the present invention is configured as described above, the following effects can be obtained. A tool holder having a plurality of tools can be advanced and retracted in the quill axis direction by first driving means (Z-axis servomotor), and can be rotated about the quill axis by second driving means (C-axis servomotor). The three driving means (B-axis servo motor) can be turned around the vertical axis perpendicular to the quill axis, and all are driven and controlled by the NC controller, and a plurality of different tools can be arbitrarily selected by the NC program. Since various moldings are performed by an operation including rotation of each control shaft, the rotation direction is also free, so that there is no restriction on the molding direction, and complicated molding can be extremely easily performed. In addition, since it does not take much time to adjust the molding timing, it is effective not only for forming springs having complicated shapes but also for forming various kinds of small amounts of springs.

[Brief description of the drawings]

FIG. 1 is a side view of an entire coil spring manufacturing machine in which only a tool operating device is shown in a sectional view.

FIG. 2 is a view as seen from the direction of arrow A in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

5A is a cross-sectional view taken along the line DD of FIG. 4, and FIG. 5B is a cross-sectional view taken along the line EE of FIG.

FIG. 6 is a sectional view of a tool operating device and a main part of a coil spring manufacturing machine.

FIG. 7 is a sectional view taken along line FF of FIG. 6;

8A and 8B are views of the tool holder and its peripheral portion, wherein FIG. 8A is a view as viewed from the direction of the arrow H, FIG. 8B is a view as viewed from directly above, and FIG. It is JJ arrow sectional drawing.

9A and 9B are explanatory diagrams of a control shaft of the tool operating device, wherein FIG. 9A is a diagram of the tool holder viewed from the tool mounting surface side, FIG. 9B is a diagram of FIG. It is the figure which looked at (a) from the lower side.

FIG. 10 is a block diagram of an NC control device.

FIG. 11 is a flowchart for explaining the operation.

FIG. 12 is an operation explanatory diagram corresponding to the flowchart of FIG. 11;

FIG. 13 is an operation explanatory diagram corresponding to the flowchart of FIG. 11;

FIG. 14 is an operation explanatory diagram corresponding to the flowchart in FIG. 11;

FIGS. 15A and 15B are views of a torsion coil spring used for explaining the operation.

FIGS. 16A and 16B are views showing examples of a spring that can be formed by the tool operating device of the present invention.

FIGS. 17 (a) and (b) are views showing examples of a spring which can be formed by the tool operating device of the present invention.

FIG. 18 is a sectional view of a conventional spring forming apparatus.

19 is a plan view showing the conventional spring forming apparatus of FIG. 18 attached to a tool mounting frame.

[Explanation of symbols]

 1 machine base 2 unit mounting frame 7A, 7B feed roller 10 quill 20 cutting and bending unit 40 tool operating device 41 unit body 42 Z axis servo motor 44 ball screw 45 rotation axis 46 large face plate 50 tool holder 52 C axis servo motor 54 Tool holding plate 56 Vertical axis 60 Gear box 61 Gear axis 65 B-axis motor 80 NC controller

Claims (1)

[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. A plurality of tools can be attached and detached around the vertical axis in a plane including the quill axis and provided to be rotatable about the quill axis and rotatable about a vertical axis orthogonal to the quill axis. , A first driving means capable of positioning the tool holder in the quill axis direction, and a second driving means capable of rotating and positioning the tool holder about the quill axis.
Driving means, a third driving means capable of rotating and positioning the tool holder about a vertical axis orthogonal to the quill axis,
An NC control device for controlling the first driving means, the second driving means, and the third driving means.