JP2003290859A - Method and machine for manufacturing coil spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such conventional problems that the curvature of a first hook is twisted, that a bulge is formed in the starting part of a coil continuing to the first hook, and that raising is impossible without having adjustment if a coil diameter is changed, in manufacturing a tension coil spring. <P>SOLUTION: The curvature Wb of the first hook, an approximately quarter turn coil part, and an approximately one full turn coil part are formed, without imparting an initial tension, by opposing the forming groove Ta of a curving tool T1 to the immediate front on the same axial line as that of a quill 10 and delivering a prescribed amount of wire before the quill 10 for abutting. The raising of the first hook is such that a bending tool T2 is positioned at a prescribed position in front of the quill 10 through the B-axis turning control and the X/Y axis forward/backward control of a tool holding plate 84, and that the wire in the straight line section of the leg is held between the two bending projections Tb, Tc of the bending tool T2 and turned around one bending projection Tb, with the straight line section of the leg raised vertically to the plane of the approximately quarter turn coil part to complete the bent part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension coil spring, in which a wire rod sent forward from a quill is collided with a tool,
The present invention relates to a coil spring manufacturing method and a coil spring manufacturing machine for forming a torsion coil spring and the like.

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Unexamined Patent Publication No. 10-76340 relating to a tool operating device of a coil spring manufacturing machine.
The invention disclosed in the publication is known. The present invention is provided in such a manner that it can advance and retreat in the direction of the quill axis immediately before the quill, can rotate about the quill axis, and can rotate about a vertical axis orthogonal to the quill axis, and in a plane orthogonal to this vertical axis. And a tool holding plate attached in a plane including the quill axis and having a plurality of tools removably attached around this vertical axis, and a first drive means capable of advancing and retracting the tool holding plate in the quill axis direction, Second driving means capable of rotationally positioning the tool holding plate about the quill axis; third driving means capable of rotationally positioning the tool holding plate about a vertical axis orthogonal to the quill axis; first driving means; Second
The driving means and the numerical control means for controlling the third driving means.

[0003]

However, the conventional tool holding plate to which a plurality of tools can be attached and detached can move forward and backward in the Z-axis direction which is the same direction as the quill axis immediately before the quill. It cannot move back and forth in the X-axis direction that is orthogonal to the axis in the horizontal direction and in the Y-axis direction that is orthogonal to the vertical direction. Therefore, for example, when the tension coil spring W1 shown in FIG. 20 is manufactured, the hook curved portion Wb of the first hook is twisted as shown in FIG.
There is a problem that the coil portion We of about 1/4 turn and the coil portion Wf of about 1 turn which are continuous with each other bulge.

This is because in order to apply initial tension to the coil portion Wg and wind the coil portion Wg by the bending tool, the forming groove of the bending tool is directed to the coil forming front side in the X-axis direction which is orthogonal to the quill axis in the horizontal direction. Although it is eccentric by the set X-axis eccentricity,
Since the position of the tool holding plate for mounting the bending tool cannot be adjusted in the X-axis direction, the hook bending portion Wb processed by the same bending tool as the coil portion Wg is twisted or the coil portion We of about 1/4 turn is wound. This is because a bulge is generated in the coil portion Wf that is about one turn.

When the first hook is raised and processed,
21 (a) after forming the coil portion We of about 1/4 turn to form the leg straight portion Wc, the bent portion Wd, and the coil portion We of about 1/4 turn shown in FIG. 21B, the core tool T7 and the raising tool T8 are advanced as shown to raise the boundary between the leg straight portion Wc and the coil portion We of about 1/4 turn shown in FIG. 21 (b). Then, the bent portion Wd shown in FIG. 21C was formed. However, in this method, the core metal tool T7 and the raising tool T8 are formed to form the bent portion Wd.
A slide device for sliding and is required,
Moreover, since the bending angle is almost determined by the tip angle of the core metal tool T7, there is a problem that a special tool is required to change the bending angle.

Further, in order to form the bent portion Wd by raising the leg straight portion Wc at a right angle to the front side in the coil forming direction with respect to the coil portion We surface of about 1/4 turn, the embodiment of the present application Even if the bending tool T2 shown in FIGS. 4 and 10 (e), which will be described later, is attached to the tool holding plate of the conventional technique, in the conventional technique, the positional relationship between the rotation axis C axis and the quill axis is relative to the quill axis. Since it is fixed in the X- and Y-axis directions in the horizontal and vertical directions, there is a problem that when the alignment is changed or the coil diameter is changed, the raising process cannot be performed. This is because the tool holding plate to which the bending tool T2 is attached cannot adjust its position in the X-axis direction and the Y-axis direction, so that the bending protrusion of the bending tool T2 that is the center of rotation of the bending portion Wd. This is because the position of Tb cannot be adjusted.

The first of the torsion coil springs shown in FIG.
When forming the tip linear portion Wm, the bent portion Wn, and the leg linear portion Wo, bend the tip linear portion Wm toward the coil side in parallel with the coil portion Wp before winding the coil portion Wp. When forming the portion Wn (when the bending direction of the bent portion Wd is the opposite direction in FIG. 21, that is, when the tip linear portion Wm is bent to the left in FIG. 21), the tip linear portion Wm is quill when the coil portion Wp is wound. There is a problem that it interferes with 110 and it is impossible to wind the coil portion Wp. Therefore, in order to form the bent portion Wn, after winding the coil portion Wp, for example, the second hook (Wq, Wr,
There is a problem that it is necessary to mold the bent portion Wn in a separate step after molding and cutting Ws).

The present invention has been made in view of the above problems, and an object thereof is to twist or bend the hook curved portion of the first hook when manufacturing a tension coil spring. Approximately 1/4 turn of the coil that is connected to the curved part and approximately 1
The problem that the winding coil portion bulges, the bent portion W
A slide device for sliding the core metal tool T7 and the raising tool T8 to form d is required, and the bending angle is almost determined by the tip angle of the core metal tool T7. Has a problem that a dedicated tool is needed, the leg straight portion Wc is a coil portion We of about 1/4 turn
Even if the bending tool T2 is attached to the conventional tool holding plate in order to form the bent portion Wd by raising the bent portion Wd at a right angle to the front side in the coil forming direction with respect to the surface, the linear shape or the coil diameter may be changed. When the bent portion Wn is formed so that the straight tip end portion Wm is parallel to the coil portion Wp before winding the coil portion Wp (FIG. 21). In the case where the bending direction of the bent portion Wd is the opposite direction, that is, when the bent portion Wd is bent to the left in FIG. 21, the tip straight portion Wm interferes with the quill 110 when the coil portion Wp is wound, and the coil portion Wp is wound. The problem is that it is impossible to solve such problems.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is characterized in that a wire rod sent forward from a quill abuts against a forming groove of a bending tool to form a coil spring. A method for manufacturing a coil spring that forms a first hook and a coil portion, wherein a forming groove of the bending tool is opposed to the quill immediately before the quill on the same axis as the quill, and a set amount of a wire rod is provided in front of the quill. A leg that connects to the hook curved portion is formed by forming a hook curved portion of the first hook by causing the delivery hook to collide, retracting the bending tool from immediately before the quill, and then discharging a set amount of wire material in front of the quill. The hook curve is formed by forming a straight line portion, making the forming groove of the bending tool face immediately before the quill on the same axis as the quill, and sending out a set amount of wire rod to the front of the quill and abutting them. Forming a coil portion of about 1/4 turn continuous with the leg straight portion in the same plane as, and moving the bending tool forward to a predetermined position after retracting the bending tool and removing the wire rod of the leg straight portion. It is sandwiched by two bending protrusions of the bending tool and is rotated about one of the bending protrusions.
The straight leg portion is bent at a position apart from the quill axis by the radius of the coil portion of 4 turns and is bent at a right angle to the front side in the coil forming direction with respect to the surface of the coil portion of about 1/4 turn. Forming a portion and retracting the bending tool, and then causing the forming groove of the bending tool to face immediately before the quill on the same axis as the quill and send a set amount of wire rod to the front of the quill for abutment. To form a coil portion of about one turn, and the forming groove of the bending tool is made to be eccentric to the front side in the coil forming direction with respect to the quill axis by a set amount, and is opposed at a position immediately in front of the quill and the set amount is set. Coil is sent to the front of the quill and abutted against the quill to give an initial tension to the wire to form a coil portion of a set number of turns that is continuous with the coil portion of about one turn and is in close contact with an adjacent coil. This is a spring manufacturing method.

According to the invention of claim 1, when the tension coil spring is manufactured, the hook bending portion of the first hook is about
The coil part of / 4 turn and the coil part of about 1 turn face the forming groove of the bending tool immediately before the quill on the same axis as the quill, and send out a set amount of wire material to the front side of the quill and collide with it. Since it is formed by the above, there is a problem that the hook curved portion of the first hook is twisted, and the coil portion We of about 1/4 turn and the coil portion of about 1 turn connected to the bent portion are swollen. Solvable.

Further, the bending tool is moved forward to a predetermined position, the wire of the leg straight portion is clamped by the two bending protrusions of the bending tool, and the bending rod is rotated around one bending protrusion. The leg straight portion at a position separated from the quill axis by the radius of the coil portion of about 1/4 turn and at a right angle to the front side in the coil forming direction with respect to the coil portion surface of about 1/4 turn. Since the bending portion is formed by raising, the bending processing can be performed by one rotatable bending tool without the need for two tools as in the prior art.

A second aspect of the present invention is a method for manufacturing a coil spring, wherein a wire rod sent forward from a quill collides with a tool to form a first hook and a coil portion of a torsion coil spring. The first hook linear material is formed by sending out a set amount of wire material capable of forming the first hook to the front of the quill, and the set amount of wire material is directed toward the forming groove of the curved tool facing immediately before the quill. By sending out from the quill and colliding with each other, a coil portion with a set number of windings that is continuous with the first hook linear material is formed, and the bending tool can be retracted from immediately before the quill, and then can advance in parallel to the perpendicular line of the quill axis. The core metal tool is advanced so as to come into contact with the coil side surface of the first hook linear material that is continuous with the front end of the coil portion in front of the quill, and then is rotated about an axis parallel to the perpendicular line of the quill axis. The movable raising tool is swung at a rotation center position substantially on the same axis as the first hook linear material parallel to the quill axis to move the first hook linear material to the coil side along the core metal tool. A method for manufacturing a coil spring, which is formed by bending and forming a leg straight portion of a first hook connected to the coil portion, a bent portion connected to the leg linear portion, and a tip straight portion bent parallel to the coil axis. is there.

According to the second aspect of the present invention, when the torsion coil spring is manufactured, the first hook linear material capable of forming the first hook and the coil portion having the set number of turns continuous with the first hook linear material. After forming and, advance the core metal tool in front of the quill so as to contact the coil side surface of the first hook linear material, and then bend the first hook linear material to the coil side along the core metal tool. As described above, the leg straight part of the first hook connected to the coil part by swiveling the raising tool in front of the quill, and the tip straight part bent in parallel to the coil axis through the bent part connected to the leg part Since the first linear portion of the first hook is formed inward from the coil end surface and in parallel with the coil portion, it is easy to form.

A third aspect of the present invention is a coil spring manufacturing machine for forming a tension coil spring, a torsion coil spring, or the like by colliding a wire rod sent forward from the quill with a tool, the front part of the quill. In the same direction with respect to the quill axis and in a direction perpendicular to the quill axis direction, the quill axis can be moved forward and backward, and is rotated about an axis C axis parallel to and including the quill axis (hereinafter referred to as C axis rotation). ) A surface that is provided so as to be rotatable about a vertical axis B axis parallel to the perpendicular of the quill axis (hereinafter referred to as B axis rotation) and that is orthogonal to the vertical axis and that includes the quill axis. A tool holding plate that is attached inside and has a plurality of tools removably attached around the vertical axis; and Z-axis drive means that can position the tool holding plate forward and backward in the Z-axis direction.
XY axis drive means capable of advancing and retracting the tool holding plate in a direction perpendicular to the quill axis direction, C axis drive means capable of rotationally positioning the tool holding plate about the C axis, and the tool holding plate A tool including a B-axis driving means capable of rotationally positioning about the B-axis, and a numerical control means for controlling the Z-axis driving means, the XY-axis driving means, the C-axis driving means, and the B-axis driving means. It is a coil spring manufacturing machine equipped with an actuator.

According to the third aspect of the present invention, the tool holding plate has the Z-axis direction which is the same direction as the quill axis line, and the X-axis direction which is orthogonal to the quill axis direction, that is, the X-axis direction which is orthogonal to the horizontal direction. It can move back and forth in the Y-axis direction that is orthogonal to the vertical direction, can rotate about the parallel axis including the same axis as the quill axis, and can rotate around the vertical axis that is parallel to the perpendicular line of the quill axis. Since it has been made possible, when manufacturing the tension coil spring, the hook bending portion of the first hook, about 1 /
The coil part of 4 turns and the coil part of about 1 turn are processed by making the forming groove of the bending tool face immediately before the quill on the same axis as the quill, and the coil part of the set number of turns forms the bending tool. By eccentrically processing the groove toward the coil forming front side in the X-axis direction by the set X-axis eccentric amount, the hook curved portion is twisted, or the coil portion of about 1/4 turn connected to the bent portion or about 1 It is possible to solve the problem of bulging of the wound coil portion.

When manufacturing the torsion coil spring,
After forming the first hook linear material capable of forming the first hook and the coil portion of the set winding number continuous with the first hook linear material, the core metal tool is used to coil the first hook linear material in front of the quill. After advancing so as to come into contact with the side surface, the raising tool is moved to the end surface side of the coil portion in the X-axis direction that is orthogonal to the quill axis in the horizontal direction, and the first hook linear material is moved along the core metal tool. Raise the tool so that it bends to the coil side, and rotate the tool in the B axis in front of the quill to bend the leg straight portion of the first hook connected to the coil portion, the bent portion connected to the leg linear portion, and the coil axis line. By forming the tip linear portion, it is possible to easily form the tip linear portion of the first hook inward of the coil end surface and in parallel with the coil portion.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a coil spring manufacturing method and a coil spring manufacturing machine according to the present invention will be described below with reference to FIGS. 1 is a side view showing a part of a tool operating device of a coil spring manufacturing machine in a vertical cross section, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a cross sectional view taken in the direction of arrow BB in FIG. 2, and FIG. It is the elements on larger scale which shows the relationship between a quill and a tool holding plate, (a) is the side view which partially expanded FIG. 1, (b) is a top view of (a),
(C) is a front view of the quill, and FIG. 5 is a block diagram of the numerical controller.

In the tool operating device of the coil spring manufacturing machine, the box frame 3 is integrally formed on the machine base 1 for this machine, and the box frame 3
Is provided with a wire rod feeding mechanism for feeding the wire rod and an auxiliary tool operating mechanism for moving the core metal tool and the cutting tool forward and backward. Further, on the front surface side of the box frame 3, there is provided a forming tool operating mechanism for advancing and retracting and rotating a forming tool for bending and forming a wire material to be fed.

The wire rod feeding mechanism includes at least a pair of wire rod feeding rollers (not shown) for nipping and feeding the wire rod, a servo motor (not shown) for driving the wire rod feeding roller, and a gear mechanism for transmitting its power to the wire rod feeding roller. 1
A quill 10 that is provided in the box frame 3 shown in FIG. 1 is attached to the front surface of the box frame 3 to guide the wire rod fed by the wire rod feed roller forward.

Further, the auxiliary tool operating mechanism is an auxiliary tool unit 20A, 20B in which a core metal tool and a cutting tool can be attached and detached.
Is provided on the front surface of the box frame 3 so as to be able to move back and forth on a radial axis centering on the axis of the quill 10. Inside the box frame 3, a servo motor (not shown) for driving these auxiliary tool units 20A, 20B and The power is the auxiliary tool unit 2
The gear mechanism which transmits to 0A and 20B is provided.
Then, the servomotors of the wire rod feeding mechanism and the auxiliary tool operating mechanism are rotationally controlled in relation to each other by a numerical controller (not shown).

Next, in the forming tool operating mechanism provided on the front side of the box frame 3, a plurality of tools can be attached and detached as shown in FIGS.
The tool holding plate 84 shown in FIG. 2 is moved by the Y-axis moving mechanism 30 in the Y-axis direction perpendicular to the axis of the quill 10, the X-axis moving mechanism 40 moves in the horizontal X-axis direction, and the Z-axis moving mechanism 5 moves.
0 allows forward / backward movement in the Z-axis direction, which is the same direction as the axis of the quill 10, and the C-axis rotation mechanism 60 allows C-axis rotation about a parallel axis including the same axis as the quill 10, and The B-axis rotation mechanism 70 is configured to be B-axis rotatable about a vertical axis perpendicular to the axis of the quill 10.

In the Y-axis moving mechanism 30, a Y-axis mount 31 is attached to the front surface of the machine base 1, and on the front surface of the Y-axis mount 31, the bearing base shown in FIG. 32, 33
Are erected vertically. A ball male screw 34A of a ball screw mechanism is rotatably supported on these bearing bases 32 and 33 via respective rolling ball bearings on a vertical line intersecting the axis of the quill 10 shown in FIG.

A Y-axis servomotor 35 is attached to a Y-axis mount 31 below the same axis as the ball male screw 34A. An output shaft of the Y-axis servomotor 35 is connected to a lower end portion of the ball male screw 34A by a joint 36. It is connected. A ball female screw 34B is screwed onto the ball male screw 34A inside the bearing bases 32 and 33 so as to be vertically movable by the rotation of the ball male screw 34A driven by the Y-axis servomotor 35.

Guide rails 37A, 37A of a linear guide mechanism are attached to the Y-axis mount 31 at the left and right sides of the male ball 34A shown in FIG. 2 in parallel with the male ball 34A. Two sliders 37B and 37B are engaged with each guide rail 37A so as to slide vertically so as to sandwich the side surface of each guide rail 37A and to be vertically movable. The side plate 38a of the Y-axis moving base 38, which is formed by the side plate 38a and the top plate 38b and has an L-shaped cross section, is attached to the ball female screw 34B and two sliders 37B and 37B. By moving and controlling the Y-axis servo motor 35, the moving table 38 is moved up and down in the Y-axis direction perpendicular to the axis of the quill 10 at right angles.

The X-axis moving mechanism 40 is provided on the upper surface of the top plate 38b of the Y-axis moving table 38 at the center portion in the left-right direction shown in FIG.
The bearing bases 42 and 43 shown in FIG. A ball male screw 44A of a ball screw mechanism is rotatably supported on these bearing pedestals 42 and 43 via rolling ball bearings (not shown) so as to be rotatable on a horizontal line orthogonal to the ball male screw 34A of the Y-axis moving mechanism 30. There is.

FIG. 2 showing the same axis as the ball male screw 44A.
The X-axis servomotor 45 is located on the left side of FIG.
The X-axis servomotor 45 attached to the top plate 38b of FIG.
The output shaft of is connected to the left end of the ball male screw 44A by a joint 46. A ball female screw 44B is attached to the ball male screw 44A inside the bearing bases 42, 43, and a ball male screw 44A driven by the X-axis servomotor 45.
Is rotated so as to move forward and backward in the left-right direction shown in FIG.

Further, two parallel thresholds 38c, 38c projecting from the upper surface of the top plate 38b are provided in parallel with the ball male screw 44A on the Y-axis moving base 38 at both left and right positions of the ball male screw 44A shown in FIG. The guide rails 47A and 47A of the linear guide mechanism are attached to the upper surface of each of these. Two sliders 4 are provided on each guide rail 47A.
7B and 47B are in sliding contact with each other so as to sandwich the side surface of each guide rail 47A, and are engaged so as to be movable back and forth. Then, the ball female screw 44B and two sliders 47B,
An X-axis moving base 48 is attached to 47B, and the X-axis moving base 48 controls the rotation of the X-axis servomotor 45 to move in the X-axis direction which is orthogonal to the axis of the quill 10 at a right angle. Moved back and forth.

The Z-axis moving mechanism 50 is constructed by vertically arranging the bearing stands 52 and 53 shown in FIG. 1 at both side positions on the upper surface of the X-axis moving stand 48 at the center in the left-right direction shown in FIG. . A ball male screw 54A of a ball screw mechanism is rotatably supported on these bearing bases 52 and 53 via respective rolling ball bearings so as to be rotatable on a horizontal line perpendicular to the ball male screw 44A of the X-axis moving mechanism 40. .

FIG. 1 of the same axis as this ball male screw 54A
The Z-axis servo motor 55 is located on the left side of FIG.
The output shaft of the Z-axis servomotor 55 is connected to the left end of the ball male screw 54A by a joint 56. A ball female screw 54B is shown in FIG. 1 in the same direction as the axis of the quill 10 by the rotation of the ball male screw 54A driven by the Z-axis servomotor 55 on the ball male screw 54A inside the bearing bases 52 and 53. It is screwed so that it can move back and forth in the left-right direction.

A guide rail 57A of a linear guide mechanism is attached to the X-axis moving base 48 at both front and rear positions of the ball male screw 54A in parallel with the ball male screw 54A. Two sliders 57B and 57B are engaged with each of the guide rails 57A so as to slide forward and backward so as to sandwich the side surface of each of the guide rails 57A. Then, the ball female screw 54B and two sliders 57 are provided.
A Z-axis moving box frame 58 is attached to B and 57B, and the Z-axis moving box frame 58 controls the rotation of the Z-axis servo motor 55 to move the Z-axis in the same direction with respect to the axis of the quill 10.
It is moved back and forth in the axial direction.

The C-axis rotating mechanism 60 will be described. Figure 3
Above the Z-axis moving box frame 58 shown in FIG.
The speed reducer 66 directly connected to the
A holding cylinder 64 is attached to the opening on the upper right side of the shaft moving box frame 58 in the figure. The driving spur gear 6 is provided on the output shaft of the speed reducer 66.
2 is fastened. A connecting cylinder 67 is rotatably supported at the center of the holding cylinder 64 via a rolling ball bearing, and a driven spur gear 63 on the left side of the drawing is fastened so as to mesh with the driving spur gear 62, and on the right side of the drawing. The C-axis rotating frame body 68 is integrally fixed. Then, the C-axis rotation frame body 68 controls the rotation of the C-axis servomotor 65 to rotate the C-axis about a parallel axis including the same axis as the quill 10 (axis of a driving shaft 71 described later). To be done.

The B-axis rotating mechanism 70 will be described. Figure 3
Above the Z-axis moving box frame 58 shown in FIG.
A speed reducer 76 directly connected to the holding cylinder 64 is attached on the same axis as the holding cylinder 64, and a driving shaft 71 rotatably supported by a connecting cylinder 67 via a rolling ball bearing is fixed to its output shaft. Has been done. A driving bevel gear 72 is integrally fixed to the other end of the driving shaft 71. Further, an intermediate shaft 74 is rotatably supported on the left upper wall 68a and the lower wall 68b of the C-axis rotating frame 68 in the drawing through roller ball bearings so as to be rotatable orthogonally to the driving shaft 71. Side wall 6 before and after the drawing which is erected on 68b
A holding lid 81 is attached to 8c.

A driven bevel gear 73 capable of meshing with the driving bevel gear 72 and a drive spur gear 77 are integrally fixed to the intermediate shaft 74. Lower wall 68b of C-axis rotating frame body 68
And the holding lid 81 via a needle roller bearing.
Is rotatably supported on a vertical axis orthogonal to the axis of the quill 10, and a driven spur gear 83 is integrally fixed to the driven shaft 82.

The driven spur gear 83 is a C-axis rotating frame body 68.
On the lower wall 68b, an integral shaft 78a is rotated by driving a drive spur gear 77 via an intermediate spur gear 78 supported by a rolling ball bearing. At the upper end of the driven shaft 82, a tool holding plate 84 formed in an equilateral triangle to which a plurality of forming tools T1, T2, T3 shown in FIG. 4 can be attached is fixed. Then, the tool holding plate 84 is rotated about the vertical axis (the axis of the driven shaft 82) parallel to the perpendicular of the axis of the quill 10 by controlling the rotation of the B-axis servomotor 75.

Therefore, the tool holding plate 84 shown in FIGS. 1 and 4 of the above-described forming tool actuating mechanism controls the Y-axis servomotor 35 to rotate in the forward and reverse directions, so that the axis line of the quill 10 together with the Y-axis moving base 38 is controlled. The quill 10 is moved together with the X-axis moving base 48 by vertically moving in the Y-axis direction orthogonal to the vertical direction and controlling the X-axis servomotor 45 to rotate forward and backward.
Is moved back and forth in the X-axis direction that is orthogonal to the axis of the quill, and the Z-axis servomotor 55 is controlled to rotate in the forward and reverse directions. It is moved back and forth in the axial direction.

Further, the tool holding plate 84 shown in FIGS.
By controlling the rotation of the C-axis servo motor 65,
Along with the C-axis rotation frame 68, the C-axis is rotated about a parallel axis including the same axis as the quill 10, and the B-axis servomotor 75 is controlled to rotate, whereby a vertical axis orthogonal to the axis of the quill 10. The B axis is rotated around. Of these operations, when the tool holding plate 84 is rotated about the C axis, the driven bevel gear 73 meshes with the driving bevel gear 72.
The rotation of the tool holding plate 84 causes the tool holding plate 84 to rotate about the B axis regardless of the rotation control of the B axis servo motor 75. Therefore, in order to cancel the B-axis rotation amount (coincidence amount) corresponding to the C-axis rotation amount of the tool holding plate 84, the B-axis servomotor 75 is rotationally controlled to prevent the rotation.

Next, each servo motor 35, 45, 5
The numerical control device 90 shown in FIG. 5 for controlling 5, 65 and 75 will be described. The input section 91 is a section for inputting programs and information from the outside, and the program storage section 92.
Is a part for storing the input program, a program interpreting part 93 is a part for interpreting the program contents and sorting the signals into necessary parts, and a function generating part 94 is for generating a function for controlling each control axis based on a program command. It is the part to do. Further, the B-axis power amplifier 95 is connected to the B-axis servo motor 75, and the C-axis power amplifier 96 is connected to the C-axis servo motor 65.
In addition, the Z-axis power amplification unit 97 is connected to the Z-axis servomotor 55,
The X-axis power amplifier 98 is a part that supplies drive power to the X-axis servomotor 45, and the Y-axis power amplifier 99 is a part that supplies drive power to the Y-axis servomotor 35, respectively.

Subsequently, the embodiment of the method for manufacturing the coil spring of the present invention will be described with reference to FIGS.
The following will be described with reference to FIGS. 13 and 19. Figure 6
Is an outline drawing showing a tension coil spring manufactured by this example,
FIG. 7 is a flowchart showing the operation sequence of this example, and FIGS. 8 to 13 are operation explanatory diagrams of this example. 8 to 13, the lower right side is a side view corresponding to FIG. 4 (a), the upper right side is a top view corresponding to FIG. 4 (b), and the lower left side is FIG. 4 (c). 19 is a front view of the quill corresponding to FIG. 19, FIG. 19 is a principle diagram of applying initial tension to the coil, (a) is an assumed path diagram of the wire, (b) is an actual path diagram of the wire, and (c) is a diagram of (a). It is a C arrow top view.

The coil spring manufactured in this example is shown in FIG.
The tip linear portion Wa, the hook curved portion Wb, the leg linear portion Wc, the bent portion Wd, the coil portion Wg, the bent portion Wh of the second hook, and the leg. The straight line portion Wi, the hook curved portion Wj, and the tip straight line portion Wk are formed. Further, the tool holding plate 84 shown in FIG.
A bending tool T1 in which a forming groove Ta for guiding the wire is formed on the front slope, and two bending protrusions Tb for bending the wire.
A bending tool T2 in which Tc is erected on the front surface and a raising tool T3 in which a raising surface Td for raising and processing the first hook is formed on the front surface are attached in three equal positions. . The two bending protrusions Tb and Tc of the bending tool T2 are the bending protrusions Tb.
The C-axis can be rotated about the center of the curve, and the interval between the bending protrusion Tb and the bending protrusion Tc is set up so that the wire can be inserted inside.

After the tension coil spring is manufactured just before it is manufactured, each tool T of the tool holding plate 84 is previously prepared.
As shown in FIG. 8 (a), 1, T2 and T3 are made to stand by in a state of being retracted from the front of the quill 10. Then, in step S1 of FIG. 7, a wire rod feed roller (not shown) is rotationally controlled to feed the wire rod by a set amount in front of the quill 10 to form the tip linear portion Wa of the tension coil spring W1 shown in FIG. 6B. To do. In the next step S2, the tool holding plate 84 is rotated in the clockwise clockwise direction by controlling the B-axis servomotor 75 to rotate the tool holding plate 84 as shown in FIG.
The bending tool T1 is rotated clockwise from the standby position shown in (a) to the clockwise direction of the arrow Bt to move the bending tool T1 to the quill 1 shown in FIG. 8 (b).
The wire rod in front of 0 (the straight tip end portion Wa) is brought into contact with the wire rod.

In the next step S3, a set amount of the wire material is sent out in front of the quill 10 and abuts against the forming groove of the bending tool T1, thereby causing the hook bending portion Wb of the tension coil spring W1 shown in FIG. Form. In the next step S4, the tool holding plate 84 is controlled to rotate in the counterclockwise reverse rotation direction of the B-axis servomotor 75, so that the tool holding plate 84 is moved from the position shown in FIG. The B-axis is rotated counterclockwise counterclockwise to make the bending tool T1 stand by at a position retracted from the front side of the quill 10 shown in FIG. 9C.

In the next step S5, the wire rod feed roller (not shown) is controlled to rotate to feed the wire rod by a set amount in front of the quill 10, and the tension coil spring W1 shown in FIG.
The leg straight portion Wc shown in (b) is formed. Next step S
6, the B-axis servo motor 75 is controlled to rotate in the forward rotation direction, whereby the tool holding plate 84 is rotated clockwise from the standby position shown in FIG.
The bending tool T1 is brought into contact with the wire (leg straight portion Wc) in front of the quill 10 shown in FIG. 9 (d).

In the next step S7, a set amount of the wire material is sent out in front of the quill 10 and abuts against the forming groove of the bending tool T1 so that the bent portion Wd of the tension coil spring W1 shown in FIG. The coil portion We is wound about 1/4 turn between the coil portion Wg and the coil portion Wg. In the next step S8,
By controlling the Z-axis servomotor 55 to rotate in the reverse rotation direction of the tool holding plate 84, the tool holding plate 84 is moved from the position shown in FIG. 9D to the Z-axis direction indicated by the arrow Zb in FIG.
Retreat to the position shown in (e).

In the next step S9, the B-axis servomotor 75 is controlled to rotate in the forward rotation direction to move the tool holding plate 84 from the position shown in FIG. 9D to the clockwise direction indicated by the arrow Bt in FIG. The B-axis is rotated clockwise to the position shown in e), and the bending tool T2 is positioned immediately before the quill 10. In the next step S10, the tool holding plate 84 controls the tool holding plate 84 to rotate clockwise in the clockwise direction when viewed from the C axis servo motor 65 side, so that the tool holding plate 84 moves along the axis of the quill 10. 9C from the position shown in FIG. 9D to the position shown in FIG. 10E in the clockwise direction of the arrow Ct.
Rotate the C axis by 0 degrees.

In the next step S11, the tool holding plate 84 of the X-axis servomotor 45 is moved to the arrow Xf of FIG. 10 (e).
By controlling the rotation in the forward rotation direction which is the same as the forward direction, the tool holding plate 84 is moved from the position shown in FIG. 10 (e) to the position shown in FIG. 10 (f) in the X-axis direction of the arrow Xf. The movement amount Sa (= radius of bending protrusion Tb of bending tool T2 + radius of wire rod) is advanced, and the Y-axis servomotor 35 is used.
The tool holding plate 84 is controlled to rotate in the same downward normal rotation direction as the arrow Yd in FIG. 10E, so that the tool holding plate 84 is moved from the position shown in FIG. In the axial direction, the Y-axis movement amount Sb (= radius of the coil portion We of about ¼ winding−radius of the bending protrusion Tb of the bending tool T2) is lowered in the axial direction to the position shown in FIG. Next step S12
10, by controlling the Z-axis servomotor 55 to rotate in the forward rotation direction of the tool holding plate 84, the tool holding plate 84 is moved from the position shown in FIG. 10E to the Z-axis direction of arrow Zf. Advance to the position shown in 10 (f).

By these steps S11 and S12, between the bending protrusion Tb and the bending protrusion Tc of the bending tool T2, the coil portion We and the leg straight portion of about 1/4 turn formed in step S7 are formed. The wire between Wc is clamped. Then, in the next step S13, the C-axis servo motor 65 is controlled to rotate in the counterclockwise reverse rotation direction when the tool holding plate 84 is viewed from the C-axis servo motor 65 side, so that the tool holding plate 84 is folded together. FIG. 1 focusing on the bending protrusion Tb of the bending tool T2.
From the position indicated by 0 (f) in the counterclockwise direction of the arrow Ch, FIG.
Rotate the C-axis 90 degrees to the position shown in (g) and move the leg straight part W
The bent portion Wd is formed by raising c at a right angle to the front side in the coil forming direction with respect to the coil portion We surface of about 1/4 turn.

In the next step S14, the Z-axis servomotor 55 is controlled to rotate in the reverse rotation direction to move the tool holding plate 84 from the position shown in FIG.
It is retracted in the axial direction to the position shown in FIG. In the next step S15, the X-axis servomotor 45 is controlled to rotate in the reverse rotation direction of the retracting direction, which is the same as the arrow Xb in FIG.
From the position shown in FIG. 11 (h) in the X-axis direction of arrow Xb.
10 (e), the Y-axis servomotor 35 is rotated by the tool holding plate 84 in the same reverse rotation direction as the arrow Yu in FIG. 11 (h). By dynamically controlling the tool holding plate 84 in FIG.
From the position indicated by (3), the Y-axis movement amount Sb is increased in the Y-axis direction of the arrow Yu.

In the next step S16, the B-axis servomotor 75 is controlled to rotate in the reverse direction to move the tool holding plate 84 from the position shown in FIG. 11 (h) to the counterclockwise direction of the arrow Bh in the B-axis. Rotate counterclockwise to move the bending tool T1 to the position shown in FIG.
The front of the quill 10 is made to stand by from the retracted position of (h). In the next step S17, the Z-axis servomotor 5
The tool holding plate 8 can be controlled by controlling the rotation of 5 in the forward rotation direction.
4 is advanced from the position shown in FIG. 11 (h) in the Z-axis direction of arrow Zf to the position shown in FIG. 12 (i). By these steps S15 to 17, the forming groove Ta of the bending tool T1 is positioned at the position where the coil is formed immediately before the quill 10.

Then, in the next step S18, the set amount of the wire rod is fed in front of the quill 10 and the bending tool T1.
By colliding with the forming groove of No. 1, the coil portion Wf of about 1 turn that is continuous with the coil portion We of about 1/4 turn formed in step 7 of the tension coil spring W1 is formed. Next step S
In FIG. 19, by controlling the X-axis servo motor 45 to rotate in the forward rotation direction, the bending tool T1 together with the tool holding plate 84 is moved from the position shown in FIG. 12 (i) to the X-axis direction of arrow Xb in FIG. ) Is moved forward by the X-axis eccentricity δ. By this forward movement, the forming groove Ta of the bending tool T1 is positioned so as to be eccentric by the X-axis eccentric amount δ with respect to the wire rod fed from the quill 10.

In the next step S20, the quill 10
6 and FIG. 12 (j) connected to the coil portion Wf of about one turn formed in step 18 of the tension coil spring W1 by sending out a set amount of the wire rod in front of the wire rod and abutting it in the forming groove Ta of the bending tool T1. The coil portion Wg shown in () is formed. This coil portion Wg is bent in step S19 by the bending tool T1.
12 is moved forward from the position shown in FIG. 12 (i) in the X-axis direction of arrow Xb to the position shown in FIG. 12 (j) by the X-axis eccentric amount δ and wound.

That is, as shown in FIG. 19 (c), the wire rod fed from the quill 10 is warped from the wire rod axis Ca defined by the quill 10 and abuts against the center surface of the molding groove Ta shown in the figure to be corrected. , The wound wire is quill 10
If it does not interfere with, it tries to move along the wire rod axis Cb shown in FIGS. However, as shown in FIG. 19B, the quill 10 is actually wound.
Since it is slidably in contact with the side surface 10a, it is wound while moving along the wire rod axis Cc. Then, since the wire rod, which is supposed to move along the wire rod axis Cb, is forced to move along the wire rod axis Cc by the side surface 10a of the quill 10, the initial tension is applied to the wound coil. The adjacent coils are wound closely.

In the next step S21, the B-axis servomotor 75 is controlled to rotate in the reverse direction, so that the tool holding plate 84 moves from the position shown in FIG. 12 (j) in the counterclockwise direction of the arrow Bh to the B-axis. Turn it to the left to move the bending tool T1 to the position shown in FIG.
The quill 10 shown in (k) is made to stand by at a position retracted from the front. In the next step S22, by controlling the X-axis servomotor 45 to rotate in the reverse rotation direction, the bending tool T1 along with the tool holding plate 84 is moved from the position shown in FIG. 12 (j) to the X-axis direction of arrow Xf. The X-axis eccentric amount δ is returned to the position shown in 13 (k). By this advance, the bending tool T
One molding groove Ta is positioned at the same axial position with respect to the wire rod fed from the quill 10.

In the next step S23, the bent portion Wh, the leg straight portion Wi, shown in FIG.
The second hook formed by the hook curved portion Wj and the tip straight portion Wk is processed. In the next step S24, the cutting tool T5 attached to the auxiliary tool unit 20B shown in FIG.
Is advanced to cut the wire rod at the front end of the quill 10, and the extension coil spring W1 shown in FIG. 6 is formed. In the next step S25, whether or not the operation is continuous is confirmed. If YES, the process returns to step 1, and if NO, the process ends.

In this first embodiment, the hook curved portion Wb of step S3 for forming the first hook, the coil portion We of about ¼ winding in step S7 for forming the coil, and the coil portion We of about one winding in step S18. In the coil portion Wf of
Since the forming groove Ta of the bending tool T1 is positioned at the same axial line position with respect to the wire rod fed from the quill 10, no initial tension is applied. Therefore, like the extension coil spring W1 shown in FIG.
The hook curved portion Wb of the hook is twisted as shown in FIG. 20A, or the coil portion We of about 1/4 turn connected to the bent portion Wd is wound.
A bulge does not occur in the coil part Wf of about 1 turn.

Subsequently, the following description will be given with reference to FIGS. 14 to 18 showing the second embodiment. FIG. 14 is an outline view showing a torsion coil spring manufactured according to the second embodiment, FIG. 15 is a flow chart showing an operation sequence of the second embodiment, and FIGS. 16 to 18 are operation explanatory views of the second embodiment.

After manufacturing the torsion coil spring immediately before manufacturing, each tool T of the tool holding plate 84 is prepared in advance.
1, T2, T3 and the auxiliary tool unit 20A shown in FIG.
The core metal tool T4 and the core metal tool T4 are retracted from the front of the quill 10 as shown in FIG. Further, by controlling the rotation of the X-axis servomotor 45, the bending tool T1
The forming groove Ta shown in FIG. 19C is eccentrically positioned by the X-axis eccentric amount δ with respect to the wire rod fed from the quill 10.

Then, in step S1 of FIG.
By controlling the rotation of a wire rod feed roller (not shown), the wire rod is fed out by a set amount in front of the quill 10, and the tip straight line portion Wm shown in FIG. 14B for forming the first hook of the torsion coil spring W2 is bent. A wire having a length corresponding to the portion Wn and the leg straight portion Wo is sent out from the quill 10. In the next step S2, the B-axis servomotor 75 is moved to the tool holding plate 84.
Is controlled to rotate in the clockwise clockwise direction, so that the tool holding plate 84 is moved from the standby position shown in FIG.
16 by rotating the B-axis to the right in the clockwise direction of FIG.
The wire rod (leg straight portion Wo) in front of the quill shown in FIG.

In the next step S3, a set amount of wire is fed in front of the quill 10 to form the forming groove T of the bending tool T1.
The coil portion W shown in FIG. 14 and FIG. 16 (b) which is continuous with the leg straight portion Wo formed in step 1 by abutting against a.
form p. Before the step S1, the coil portion Wp is formed by forming the bending tool T1 in the forming groove Ta shown in FIG.
However, the wire rod fed from the quill 10 is eccentrically wound by the X-axis eccentric amount δ. Therefore, as described in the first embodiment, the initial tension is applied to the wound coil, and the adjacent coils are wound closely.

In the next step S4, the Z-axis servomotor 55 is controlled to rotate in the reverse rotation direction of the tool holding plate 84, so that the tool holding plate 84 is moved from the position shown in FIG. It is retracted in the Z-axis direction of Zb to the position shown in FIG. In the next step S5, the B-axis servomotor 75 is controlled to rotate in the reverse rotation direction, thereby rotating the tool holding plate 84 counterclockwise from the position shown in FIG. Then, the bending tool T1 is made to stand by at a position retracted from the front of the quill 10 shown in FIG. 17 (c).

In the next step S6, the tool holding plate 84 is quilled by controlling the tool holding plate 84 to rotate counterclockwise as viewed from the C axis servo motor side. With the C axis parallel to the axis of 10 as the center, the C axis is rotated 90 degrees counterclockwise from the position shown in FIG. 16B to the position shown in FIG. In the next step S7, the core metal tool T4 of the auxiliary tool unit 20A shown in FIG. 1 is moved up from the position shown in FIG.
The leg straight portion Wo is brought into contact with the front of the quill 10 shown in (d).

In the next step S8, the tool holding plate 84 controls the X-axis servomotor 45 to rotate in the forward rotation direction, which is the same as the arrow Xf in FIG. 17C.
Move the tool holding plate 84 from the position shown in FIG.
X-axis movement amount S in the X-axis direction up to the position shown in FIG.
Move forward by c. In the next step S9, the tool holding plate 84 is controlled to rotate in the forward rotation direction of the forward direction of the Z-axis servomotor 55, so that the tool holding plate 84 is moved as shown in FIG.
From the position shown in (c) to the Z-axis direction of the arrow Zf in FIG.
Advance to the position shown in (d).

In the next step S10, the B-axis servomotor 75 is controlled to rotate the tool holding plate 84 in the counterclockwise reverse rotation direction, so that the tool holding plate 84 is moved to the position shown in FIG.
By rotating the B-axis counterclockwise from the position shown in (c) in the counterclockwise direction indicated by the arrow Bh, the raising tool T3 is brought into contact with the tip linear portion Wm shown in FIG. 17 (d). Then, as shown in FIG. 14 (b), by the cooperation of the raised surface Td of the raising tool T3 and the core metal tool T4, the tip linear portion Wm connected to the leg linear portion Wo through the bent portion Wn is coiled. The coil portion Wp is formed inward from the end face.

In the next step S11, the Z-axis servomotor 55 is controlled to rotate in the reverse rotation direction to move the tool holding plate 84 from the position shown in FIG.
It is retracted in the axial direction to the position shown in FIG. In the next step S12, the core metal tool T4 is moved to the position shown in FIG.
1 from the position shown in FIG.
8 (e) is made to stand by at the lower end position.

In the next step S13, the leg straight portion Wq and the bent portion W shown in FIG.
The second hook formed by r and the tip straight portion Ws is processed. In the next step S14, the cutting tool T5 attached to the auxiliary tool unit 20B shown in FIG. 1 is advanced to cut the wire rod at the front end of the quill 10 to form the torsion coil spring W2 shown in FIG. Next step S
In 15, it is confirmed whether or not the operation is continuous. If YES, the procedure returns to step 1, and if NO, the procedure ends.

The coil spring manufacturing method and the coil spring manufacturing machine according to the present invention are not limited to the above-described embodiments, and various forms can be configured without departing from the gist of the present invention. be able to.

[0066]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the present invention, when the tension coil spring is manufactured, it is approximately 1/4 of the hook curved portion of the first hook.
The coil part for winding and the coil part for about 1 winding are formed by facing the forming groove of the bending tool immediately before the quill on the same axis as the quill and sending a set amount of wire material to the front side of the quill and abutting the quill. Therefore, the hook curved portion of the first hook is twisted, or the coil portion W of about 1/4 turn is connected to the bent portion.
It is possible to solve the problem that the swelling occurs in the coil portion of e or about one turn, and the quality can be improved.

Further, the bending tool is moved forward to a predetermined position, the wire material of the leg straight portion is sandwiched by the two bending protrusions of the bending tool, and is rotated about one bending protrusion. Then, the leg straight part is raised at a right angle to the front side in the coil forming direction with respect to the coil part surface of about 1/4 turn at a position separated from the quill axis by the radius of the coil part of about 1/4 turn. Since the bending portion is formed by using one bending tool which can be rotated without the need for two tools as in the prior art, the bending process can be performed by N
The C program can be simplified.

According to the second aspect of the present invention, when the torsion coil spring is manufactured, the first hook linear material capable of forming the first hook and the coil having the set number of turns continuous with the first hook linear material. After forming the section, advance the core metal tool in front of the quill so as to contact the side surface of the first hook linear material on the coil side, and then move the first hook linear material to the coil side along the core metal tool. A leg straight portion of the first hook connected to the coil portion by turning the raising tool so as to bend in front of the quill, and a tip straight portion bent parallel to the coil axis through the bent portion connected to the leg linear portion. Was formed. In this way, since the bending of the first hook is processed after winding the coil, it is possible to prevent interference with the quill of the linear portion at the tip of the first hook when winding the coil. In addition, it is possible to easily form the tip linear portion of the first hook inward of the coil end surface and in parallel with the coil portion, and it is possible to manufacture various types of coil springs.

According to the third aspect of the invention, the tool holding plate has the Z-axis direction which is the same direction as the quill axis line, the X-axis direction which is orthogonal to the quill axis direction, that is, the X-axis direction which is orthogonal to the horizontal direction, and Or it can move back and forth in the Y-axis direction that is orthogonal to the vertical direction, and can rotate the C-axis about an axis that is parallel to and includes the same axis as the quill axis, and can rotate the B-axis about the vertical axis that is orthogonal to the quill axis. Therefore, when manufacturing a tension coil spring, the hook curved portion of the first hook, the coil portion of about 1/4 turn, and the coil portion of about 1 turn have the forming groove of the bending tool on the same axis as the quill. The coil part with the set number of turns is processed by facing it immediately before the line, and the bending groove of the bending tool is eccentrically processed toward the coil forming front side in the X-axis direction by the set X-axis eccentric amount to process the hook curve. The part is twisted or it is connected to the bent part About 1/4 turns Bulges coil portion of yl portion and about single turn can solve a problem that arises.

The first hook of the tension coil spring adjusts the tool holding plate in the X-axis direction, which is orthogonal to the quill axis in the horizontal direction, and in the Y-axis direction, which is orthogonal to the vertical direction. The wire of the straight part is sandwiched by the two bending protrusions of the bending tool, and is rotated around one bending protrusion, and the radius of the coil portion is about 1/4 turn from the quill axis. The leg straight part is raised at a right angle to the front side in the coil forming direction with respect to the coil part surface of about 1/4 turn at a position spaced apart by 2 to form two bent parts as in the prior art. It is possible to perform the raising process with a single bending tool that can be rotated without the need for the above tool, and the NC program can be simplified.

Similarly, when manufacturing a torsion coil spring, after forming a first hook linear material capable of forming a first hook and a coil portion having a set winding number continuous with the first hook linear material, , Advance the core metal tool so as to contact the coil side surface of the first hook straight material in front of the quill, and then raise the raising tool to the coil end face in the X-axis direction that is orthogonal to the quill axis in the horizontal direction. And the first hook straight material is bent along the core metal tool toward the coil side, and the tool is rotated by the B axis in front of the quill, and the straight part of the leg of the first hook connected to the coil part, It is possible to form the tip linear portion of the first hook inward of the coil end surface and in parallel with the coil portion by forming the tip linear portion that is bent parallel to the coil axis through the bent portion that is continuous with the leg linear portion. You can easily. Further, since the bending of the first hook is processed after winding the coil, it is possible to prevent interference with the quill at the straight end portion of the first hook when winding the coil.

[Brief description of drawings]

FIG. 1 is a side view showing a tool actuating device of a coil spring manufacturing machine according to the present invention, with a partial vertical cross section.

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

FIG. 3 is likewise a sectional view taken along the line BB of FIG.

4 is a partially enlarged view showing the relationship between the quill and each tool, FIG. 4A is a side view in which FIG. 1 is partially enlarged,
(B) is a top view of (a), (c) is a front view of a quill.

FIG. 5 is likewise a block diagram of the numerical controller.

FIG. 6 is an outline view showing a tension coil spring manufactured according to the first embodiment of the present invention.

FIG. 7 is likewise a flow chart showing the operation sequence of the first embodiment.

FIG. 8 is likewise an operation explanatory view of the first embodiment, in which (a) shows steps S1 and S2, and (b) shows steps S3 and S4.

9] Similarly, (c) shows steps S5, S6, and (d).
Is steps S7 to S10.

FIG. 10 (e) shows steps S11, S12,
(F) is step S13.

FIG. 11 is likewise a step (g) of step S14 and a step (h) of steps S15 to S17.

12] Similarly, (i) shows steps S18, S19,
(J) is steps S20 to S22.

FIG. 13 (k) is also the result of the operation of step S22.

FIG. 14 is an outline view showing a torsion coil spring manufactured according to the second embodiment of the present invention.

FIG. 15 is likewise a flowchart showing the operation sequence of the second embodiment.

FIG. 16 is also an operation explanatory diagram of the second embodiment, in which (a)
Is steps S1 and S2, and (b) is steps S3 to S6.

FIG. 17 (c) shows steps S7 to S10,
(D) is steps S11 and S12.

FIG. 18E similarly shows the result of the operation of step S12.

FIG. 19 is a principle diagram of applying initial tension to a coil, (a)
Is a hypothetical path map of the wire rod, (b) is an actual path map of the wire rod,
(C) is a top view of FIG.

FIG. 20 is an outline view showing a tension coil spring manufactured by a conventional technique.

FIG. 21 is an explanatory diagram of a hook raising operation according to a conventional technique.

[Explanation of symbols]

10 quills 20A, 20B Auxiliary tool unit 30 Y-axis movement mechanism 31 Y-axis mount 35 Y-axis servo motor 38 Y-axis moving stand 40 X-axis movement mechanism 45 X-axis servo motor 48 X-axis moving stand 50 Z-axis movement mechanism 55 Z-axis servo motor 58 Z-axis moving box frame 60 C axis rotation mechanism 65 C-axis servo motor 68 C-axis rotating frame 70 B-axis rotation mechanism 75 B-axis servo motor 84 Tool holding plate T1 bending tool T2 bending tool T3 raising tool T4 core metal tool T5 cutting tool δ X-axis eccentricity

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J059 AD04 BA01 BC02 BD02 CB17                       EA02                 4E070 AB09 BC12 BC23 DA02

Claims (3)

[Claims] 1. A method of manufacturing a coil spring, wherein a wire rod sent forward from a quill abuts a forming groove of a bending tool to form a first hook and a coil portion of the coil spring.
The hook groove of the first hook is formed by causing the forming groove of the bending tool to face immediately before the quill on the same axis as the quill and sending a set amount of wire material to the front side of the quill to cause the hook to collide with the quill. After retracting the bending tool from immediately before, a set amount of wire material is sent out in front of the quill to form a leg straight portion continuous with the hook bending portion, and the forming groove of the bending tool is on the same axis as the quill. Of the coil portion of about 1/4 turn connected to the leg straight portion in the same plane as the hook curved portion by sending out a set amount of the wire rod in front of the quill so as to face each other immediately before the quill. After forming the bending tool and retracting the bending tool, the bending tool is moved forward to a predetermined position, and the wire rod of the leg straight portion is sandwiched by two bending protrusions of the bending tool and one bending protrusion is formed. Rotate around the child The straight leg portion is raised at a right angle to the front side in the coil forming direction with respect to the surface of the coil portion of about 1/4 turn at a position separated from the quill axis by the radius of the coil portion of about 1/4 turn. To form a bent portion, and after retracting the bending tool, the forming groove of the bending tool is made to face immediately before the quill on the same axis as the quill and a set amount of wire material is sent out in front of the quill. By making them collide with each other, a coil portion of about one turn is formed, and the bending groove of the bending tool is opposed to the front side of the quill which is eccentric to the front side in the coil forming direction with respect to the quill axis by a set amount. By sending a set amount of wire material to the front of the quill and abutting the quill, initial tension is applied to the wire material to form a coil part of a set number of turns that is continuous with the coil part of about one turn and is in close contact with an adjacent coil. Of coil springs characterized by Method. 2. A method for manufacturing a coil spring, comprising forming a first hook and a coil portion of a torsion coil spring by abutting a wire rod sent forward from a quill with a tool, wherein the setting is such that the first hook can be formed. Forming a first hook straight material by sending out a certain amount of wire material in front of the quill, and sending out a set amount of wire material from the quill toward the forming groove of the opposing curved tool immediately before the quill and colliding with it. In the first
Forming a coil portion with a set number of windings continuous with one hook straight material, and retracting the bending tool from immediately before the quill and then moving a core metal tool that can advance parallel to the perpendicular of the quill axis to the coil in front of the quill. A raising tool which is rotatable about an axis parallel to a perpendicular line of the quill axis after being advanced so as to come into contact with a coil side surface of the first hook linear material connected to the front end of the part; The leg straight portion of the first hook connected to the coil portion by turning the first hook linear material toward the coil side along the core metal tool by rotating the first hook linear material at a rotation center position on substantially the same axis as the first hook linear material. A method for manufacturing a coil spring, characterized in that a bent portion connected to the leg straight portion and a tip straight portion bent in parallel with the coil axis are formed. 3. A coil spring manufacturing machine for forming a tension coil spring, a torsion coil spring or the like by colliding a wire rod sent forward from the quill with a tool, and in the same direction with respect to the quill axis line in front of the quill. Vertical axis B axis that is movable back and forth in the Z-axis direction and a direction perpendicular to the quill axis direction, is rotatable about an axis C axis that is parallel to and includes the same axis as the quill axis, and that is parallel to the perpendicular line of the quill axis line. And a tool holding plate which is rotatably provided around the vertical axis and is attached in a plane that is orthogonal to the vertical axis and includes the quill axis so that a plurality of tools can be detachably attached around the vertical axis. Z axis driving means capable of advancing and retracting the tool holding plate in the Z axis direction, and X capable of advancing and retracting the tool holding plate in a direction perpendicular to the quill axis direction.
Y-axis driving means, C-axis driving means capable of rotationally positioning the tool holding plate about the C-axis, and B-axis driving means capable of rotationally positioning the tool holding plate about the B-axis. A coil spring manufacturing machine equipped with a tool operating device including a numerical control means for controlling the Z-axis driving means, the XY-axis driving means, the C-axis driving means, and the B-axis driving means.