JPH07227635A - Method and device for bending end part before forming spring in nc coiling machine - Google Patents

Abstract

PURPOSE:To provide an initial end part bending method and its device before forming a coil spring, automatically executing the end part bending to the initial end part of a wire rod before forming-the coil spring by using a first forming tool and a second forming tool. CONSTITUTION:The initial end part of the wire rod 4 is fed out by a first intermittent feeding of feeding rollers 3A, 3B and the first forming tool 15 firstly formed is advanced to execute the first bending and the formation of the first curving part is executed by a second intermittent feeding. After executing the second bending by advance of the second forming tool 35, the formation of the curving part of the initial end part of the wire rod is completed by a third intermittent feeding and the cut-off of the tip part is executed by advance of a cut-off tool 71. The above method is in the case of being the clockwise rotating coil spring, and in the case of being the counterclockwise rotating coil spring, the forming tool firstly formed is used as the second forming tool and the forming tool secondly formed is used as the first forming tool and the cut-off tool 71 is fitted to a cut-off tool unit 60 to execute the cut-off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end bending method and device for forming an initial end portion of a wire into a coil winding start portion having a predetermined curvature in an NC coiling machine before starting coil spring forming.

[0002]

2. Description of the Related Art An initial end portion of a wire rod supplied from a wire rod feeder is protruded from a tip end of a wire guide of an NC coiling machine, and an end bending for forming a coil winding start portion having a predetermined curvature is performed to form a forming tool. It is necessary to be able to mold the coil spring by. Conventionally, this end bending is manually performed by using a dedicated end bending wrench 101 as shown in FIG. 10, or the end bending is performed by using a dedicated jig 102 as shown in FIG. 11 for performing curling molding drive. It was

[0003]

The method using the end bending wrench 101 described in the prior art is a heavy work requiring a great force when the wire diameter of the wire material exceeds 5 mm, for example. Also, the method using the dedicated jig 102
The jig itself becomes heavy, and if it is a hand-held operation, the reaction force due to bending must be supported, and if the wire diameter of the wire becomes thick, this also requires a great deal of labor.
The present invention has been made in view of the above problems of the prior art, and an object thereof is an NC coiling capable of almost automatically performing end bending by only an element unit required for forming a coil spring. It is an object of the present invention to provide a method and apparatus for bending an end of a machine before spring forming.

[0004]

In order to achieve the above object, an end bending method of an NC coiling machine according to the present invention before spring forming is performed by winding a wire rod first end portion with a predetermined curvature before forming a coil spring. A method of end bending before spring forming of an NC coiling machine for forming an initial portion, in which a first intermittent feed is performed to feed a predetermined amount of the tip of the wire rod from the tip of the wire guide to form the first tool. The first bending is performed by advancing, the first curvature is formed by the forming tool for forming No. 1 by the second intermittent feed, and the forming tool for forming No. 2 is moved forward to perform the second bending. And a cutting tool on the side of the forming tool for forming the second curvature by forming the second curvature portion with the forming tool for forming the first and the forming tool for forming the second by the third intermittent feed. Cutting the tip with a core bar Is Umono.

In the first intermittent feeding, the tip of the first end portion of the wire is fed from the tip of the wire guide by a predetermined amount, and the forward movement of the feed cam advances the first forming tool to form the first forming tool.
Bending, and the forming tool for forming No. 1 is formed by the second intermittent feed to form the primary curvature portion, and the stopper of the forming tool for forming No. 1 prevents the retreat of the forming tool. The second bending is performed by advancing the forming tool for forming No. 2 by the rotation in the opposite direction to the second forming tool by the forming tool for forming No. 1 and the forming tool for forming No. 2 by the third intermittent feed. It is also possible to form the curved portion and cut the tip portion with the cutting tool and the core metal on the side of the forming tool for forming No. 2.

In addition, the end-bending device before spring forming of the NC coiling machine is an end before spring forming of the NC coiling machine that forms a wire wire initial end portion into a winding start portion of a predetermined curvature before starting a coil spring forming process. A bending device, which is an NC-driven wire rod feeding member for feeding a wire rod along a wire line formed by a wire guide, and is movable above and below the wire line and movable in an end bendable direction, and a coil. A first forming tool unit having a first forming tool oriented in a spring formable direction, a first stopper member for preventing retraction of the first forming tool as necessary, and the first forming tool with respect to the wire line. A second forming tool having a second forming tool which is arranged substantially symmetrically with the unit, is movable in an end bendable direction, and is oriented in a coil spring formable direction. A knit, an NC-driven first cam feed member capable of independently moving the first forming tool and the second forming tool, and a unit provided near the second forming tool unit and moved substantially at right angles to the wire line. A first cutting tool unit having a possible first cutting tool;
It comprises an NC driven second cam feed member for moving the first cutting tool.

Further, a second cutting tool unit having a second cutting tool which can move substantially at right angles to the wire line is provided in the vicinity of the first forming tool unit, and a third NC drive for moving the second cutting tool. A cam feed member is provided to prevent the second molding tool from retracting when necessary.
It is also possible to provide a stopper member so as to be compatible with forming of right-handed and left-handed coil springs.

The first cam feed member has a left-right symmetrical drive cam that moves the first forming tool forward by forward rotation and advances the second forming tool forward by reverse rotation.

[0009]

In the case of end bending before forming the right-handed coil spring, the first end of the wire material is fed by a predetermined amount by the first intermittent feed from the wire guide to form the first wire. For example, the first forming tool is fed by the first cam. The member is moved forward by the forward rotation of the first drive cam of the member to perform the first bending, the operation of the first drive cam is stopped, and the first forming tool is stopped at the forward position. 1
The following curvature shaping is performed.

Next, the first forming tool is fixed to the forward position by the first stopper member or the cam shape of the first drive cam, and the second drive is formed by the reverse rotation of the first drive cam, for example, the second forming tool.
The forming tool is advanced to perform the second bending, the operation of the first drive cam is stopped, and the second forming tool is stopped at the advancing position. The first and second forming tools are intermittently fed by the third intermittent feed. The curvature forming of the wire rod first end portion is completed by, and the tip portion is cut by the first cutting tool and the core metal on the second forming tool side.

In the case of end bending before forming the left-handed coil spring, a predetermined amount of wire is fed by the first intermittent feed, and the first forming tool for forming first, for example, is advanced to perform the first bending, and then the second bending is performed. First-order curvature forming is performed by the second forming tool by intermittent feed, the second forming tool is fixed at the forward position, and the second forming tool is formed. For example, the first forming tool is moved forward to perform the second bending. Then, the curvature forming of the wire rod initial end portion by the first and second forming tools is completed by the third intermittent feed, and the tip portion is cut by the second cutting tool and the core metal on the first forming tool side.

[0012]

Embodiments will be described below with reference to the drawings. In the NC coiling machine of FIG. 1, the frame 1
The wire guide 2 is horizontally attached to the wire guide 2, and the axial center line of the wire rod feed hole of the wire guide 2 forms a wire line aa. A plurality of pairs of upper and lower feed rollers 3A and 3B are provided on both sides of the wire line aa, and the upper feed roller 3B is pressed downward by a pressing means (not shown) so as to clamp the wire 4. It has become. Feed roller 3
A and 3B are rotated in opposite directions by a NC drive servomotor (not shown) via a gear train (not shown), and the wire 4 is fed from left to right in the figure.

The first forming tool unit 10 and the second forming tool unit 30 are vertically symmetrical with respect to the wire line aa, and the first forming tool unit 10
The guide board 11 of the lower side of the wire line aa
The guide 31 of the molding tool unit 30 is a wire line a.
-A is fixed on the vertical surface of the frame 1 at an angle of about 67.5 ° with respect to the wire line a-a, which is convenient for end bending, respectively, and is moved to the guides 11 and 31. The tables 12 and 32 are movably mounted.

Tool stands 13 and 33 having an L-shaped cross-section are provided on the front sides of the movable tables 12 and 32, which are convenient for forming coil springs with respect to the wire line aa. The tool holders 14 and 34 are fixed to the side surfaces of the tool bases 13 and 33 so as to be pivotable around the pins 7 and 7, and the first forming tool 15 is fixed to the tool holder 14 with the angle of 45 °. Further, the second forming tool 35 is attached to the tool holder 34 so as to be fixedly and detachably attached.

A wire line a is formed on the vertical surface of the frame 1.
On the extension line of −a, the first drive cam 5 having a symmetrical shape is
The first drive cam 5 is rotatably provided around a cam shaft 5a parallel to the shaft centers of the feed rollers 3A and 3B. The first drive cam 5 is rotated by an NC control servo motor (not shown).

Contact plates 16 and 3 are provided at the rear ends of the movable tables 12 and 32, respectively.
6 are fixed to each other, and feed levers 17 and 37 are pivotally supported between the contact plates 16 and 26 and the first feed cam 5. A cam follower 18 and a hit roller 19 are rotatably provided at both ends of the feed lever 17, and a cam follower 38 and a hit roller 39 are rotatably provided at both ends of the feed lever 37. The feed levers 17 and 37 are constantly cam followers by springs 17a and 37a. 18, 38 are urged so as to contact the first drive cam 5. Further, the movable bases 12 and 32 are constantly urged rearward by the springs 6 and 6, and the feed levers 17 and
The contact rollers 19 and 39 of 37 come into contact with the rear end surfaces of the contact plates 16 and 36.

Further, brackets 21, 41 fixed to the rear ends of the guides 11, 31 rotatably support a first stopper bolt 22 and a second stopper bolt 42 which are screwed into the female threads of the worm wheels 8, 8. The worm wheels 8 and 8 are meshed with a worm (not shown) having knobs 23 and / or 43 at the ends thereof, and by manually rotating the knobs 23 and / or 43, the first stopper bolt 22 and / or the second stopper bolt 42 are rotated. It moves in the direction to prevent the movable table 12 or 32 from being retracted so as to maintain the spring forming position.

On the other hand, the first cutting tool unit 50 and the second cutting tool unit 50
The cutting tool unit 60 is disposed at right angles and vertically symmetrical to the wire line aa, and the guide base 51 of the first cutting tool unit 50 is located above the wire line aa and the second cutting tool unit. The guides 61 of the unit 60 are fixed on the vertical surface of the frame 1 at right angles to the lower sides of the wire lines aa.

Moving bases 52, 62 are movably mounted on the guide bases 51, 61, and connecting shavings 53, 63 are rotatably supported by pins 53a, 63a at the rear ends of the moving bases 52, 62. There is. And the first cutting tool unit 50 and the second
A second drive cam 9A and a third drive cam 9B are provided on the left side of the cutting tool unit 60 shown in FIG. 1 so as to be rotatable around cam shafts 9a and 9b parallel to the shaft centers of the feed rollers 3A and 3B, respectively. .

The second drive cam 9A and the third drive cam 9B are respectively rotated by separate NC-controlled servomotors (not shown), and the feed lever 54 is provided between the second drive cam 9A and the connecting daub 53, and the third drive cam 9B. The feed levers 64 are pivotably provided between the drive cam 9B and the connecting ribs 63, respectively. Further, cam followers 55, 65 are rotatably provided at one ends of the feed levers 54, 64, and the other ends thereof are connected to each other.
Pins 54a and 64a are pivotally connected to pins 3 and 63, respectively.

The movable bases 52 and 62 are constantly urged rearward by springs 70 and 70 so that the cam followers 55 and 65 contact the cam surfaces of the second drive cam 9A and the third drive cam 9B, respectively, and the right side shown in FIG. When forming the coiled coil spring, the cutting tool 71 is attached to the moving table 52 and the moving table 62 is moved.
Each of the pitch tools 72 is detachably attached to the cutting tool 7 near the tip of the wire guide 2.
A half-moon-shaped core metal 73, which is a mating blade of No. 1, is provided.

Next, the operation of this embodiment will be described with reference to FIGS.
The operation will be described with reference to FIG. In FIG. 3, the first intermittent feed of the feed rollers 3A and 3B causes the tip of the initial end portion of the wire 4 to be fed from the tip of the wire guide 2 by a predetermined amount. In FIG. 4, the first feed cam 5 rotates counterclockwise, and the moving base 12 of the first forming tool unit 10 for forming the first mold moves forward via the feed lever 17. At this time, the movable table 32 of the second molding tool unit 30 that molds No. 2 remains stopped at the rear end position.

In FIG. 5, the tip of the first forming tool 15 comes into contact with the wire 4 as the moving table 12 advances, and the tip is bent to approximately 45 ° by the first bending. In FIG. 6, the wire rod 4 is secondly intermittently fed by the feed rollers 3A and 3B, and the first curvature tool is molded by the first molding tool 15 at the forward position.

In FIG. 7, the knob 23 is turned to advance the first stopper bolt 22 to prevent the moving base 12 from retreating to fix the first forming tool 15 at the coil spring forming position, and the first drive cam 5 is set. Rotate clockwise and feed lever 3
Second molding tool unit 30 for molding No. 2 through 7
The moving table 32 moves forward. At this time, the first molding tool 15
Is fixed at the coil spring forming position, so that the roller 19 of the feed lever 17 separates from the contact plate 16 of the movable table 12.

In FIG. 8, the second forming tool 35 is brought into contact with the wire 4 by the forward movement of the moving table 32 to perform the second bending, and then the feed rollers 3A and 3B carry out the third intermittent feed, and the second feed is performed. The first forming tool 15 and the second forming tool 35 complete the forming of the end bent portion before forming the coil spring having a predetermined curvature.

In FIG. 9, the first cutting tool unit 5
The moving table 52 of 0 moves forward and the cutting tool 71 cuts the non-curved portion sent by the first intermittent feed. Then, the cutting tool 71 retracts to complete the preparation for forming the coil spring.

The above is the end bending operation in the case of the right-handed coil spring. In the case of the left-handed coil spring, the first forming tool is the second forming tool unit 30, and the second forming tool is the second forming tool unit. It becomes one molding unit 10.
Therefore, the first bending and the first-order curvature forming are performed by the second forming tool 35 of the second forming tool unit 30, the retreat of the second forming tool 35 is prevented by the second stopper bolt 42, and the first forming is performed. The first bending tool 15 of the tool unit 10 performs the second bending and the second-order curvature forming, the cutting tool 71 is attached to the second cutting tool unit 60, and the tip portion is cut. At this time, the first cutting tool unit 5
0 is pitch tool 72 for left-handed coil spring forming
Is attached.

The first driving cam 5 is not limited to one symmetrically shaped cam, but two asymmetrical cams having the same cam shaft 5a are used as the first forming tool with one cam. It is also possible that the other cam moves the second molding tool 35.

[0028]

Since the present invention is configured as described above, it has the following effects. Claims 1, 2 and 3 make it possible to move a first forming tool and a second forming tool having a contact angle with a wire required for forming a coil spring in an angle direction required for end bending with respect to a wire on a wire line. Since the drive of the first forming tool and the second forming tool and the drive of the wire feeding member are independently performed by NC control, conventionally, they are manually performed using a dedicated tool or a dedicated jig. The end bending work of the first end of the wire rod can be easily performed by using the forming tool unit of the NC coiling machine, and the coil spring forming process can be continued after the end bending, and the efficiency is greatly improved.

According to a fourth aspect of the present invention, the first forming tool and the second forming tool can correspond to both the forming tool for forming first and the forming tool for forming second, and the cutting tool is placed at a symmetrical position. Since individual pieces are provided, it is possible to support both right-handed and left-handed coil springs, and the range of use is expanded.

[Brief description of drawings]

FIG. 1 is a front view of an end bending device of an NC coiling machine according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a first molding tool unit (second molding tool unit).

FIG. 3 is a view showing a state in which the tip of the wire rod is slightly fed out by the first intermittent feed.

FIG. 4 is a view showing the advancement of the first molding tool.

FIG. 5 is a diagram showing a first bending by a first forming tool.

FIG. 6 is a view showing a state where the first curvature tool is molded by the first molding tool in the second intermittent feed.

FIG. 7 is a view showing the advancement of the second molding tool.

FIG. 8 is a diagram showing a state in which the second bending by the second forming tool and the forming of the curved portion of the winding start portion are completed by the third intermittent feed.

FIG. 9 is a view showing a state in which cutting of a non-curved tip portion has been completed by a cutting tool.

FIG. 10 is a perspective view of a prior art end bending wrench.

FIG. 11 is a perspective view of a conventional dedicated jig.

[Explanation of symbols]

1 frame 2 wire guide 3A, 3B feed roller 4 wire 5 first drive cam 9A second drive cam 9B third drive cam 10 first forming tool unit 15 first forming tool 30 second forming tool unit 35 second forming tool 50 1st cutting tool unit 60 2nd cutting tool unit 71 Cutting tool

Claims (5)

[Claims] 1. An end bending method before spring forming of an NC coiling machine for forming an initial end portion of a wire into a winding start portion having a predetermined curvature before starting a forming process of a coil spring, wherein a wire is formed by a first intermittent feed. The first bending is performed by advancing the forming tool for forming the first by sending a predetermined amount of the tip of the wire rod from the guide end, and the first forming is performed by the forming tool for forming the first by the second intermittent feed. The second bending is performed by advancing the forming tool for forming No. 2 by performing the forming of the curved portion of No. 2, and the third forming tool for forming No. 1 and the forming tool for forming No. 2 are formed by the third intermittent feed. An end bending method before spring forming of an NC coiling machine, characterized in that a secondary curvature portion is formed, and the tip portion is cut by a cutting tool and a core metal on the side of the forming tool for forming No. 2 above. 2. An end bending method before spring forming of an NC coiling machine for forming an initial end portion of a wire into a winding start portion having a predetermined curvature before forming a coil spring. The tip of the first end of the wire is sent out from the tip of the guide by a predetermined amount, and the feed tool rotates forward in the forward direction to advance the forming tool to make the first bending, and the second intermittent feed makes it the first The forming tool for forming the first curvature is formed by the forming tool for forming, and the stopper of the forming tool for forming the first forming member is prevented from moving backward, and then the forming tool for forming the second forming member is formed by rotating the feed cam in the opposite direction. Forming the second curvature portion by advancing to perform the second bending and forming the No. 1 molding tool and No. 2 molding tool by the third intermittent feed, and forming the No. 2 molding Depending on the cutting tool on the tool side and the core A method for bending an end of an NC coiling machine before forming a spring, which comprises cutting the tip. 3. An end bending device before spring forming of an NC coiling machine for forming a wire rod initial end portion into a winding start portion having a predetermined curvature before forming a coil spring, and a wire formed by a wire guide. An NC-driven wire rod feeding member for feeding a wire rod along a line, and a wire rod movable above and below the wire line and movable in an end bendable direction, and
A first forming tool unit having a first forming tool facing a direction in which a coil spring can be formed, a first stopper member for preventing retraction of the first forming tool as necessary, and the first forming for the wire line. A second forming tool unit having a second forming tool which is arranged substantially symmetrically with the tool unit and which is movable in an end bendable direction and is oriented in a coil spring formable direction, the first forming tool and the second forming tool. An NC-driven first cam feed member capable of independently moving a forming tool, and a first cam feed member provided near the second forming tool unit and movable substantially at right angles to the wire line.
An end bending device before spring forming of an NC coiling machine comprising a first cutting tool unit having a cutting tool and an NC driven second cam feed member for moving the first cutting tool. 4. A third NC-driven unit for moving a second cutting tool, the second cutting tool unit having a second cutting tool movable substantially at right angles to a wire line is provided near the first forming tool unit. 4. A cam feed member is provided, and a second stopper member is provided to prevent the retreat of the second forming tool as necessary so as to be compatible with forming work of right-handed and left-handed coil springs. NC
End bending device before spring forming of coiling machine. 5. The first cam feed member has a left-right symmetrical first drive cam for advancing the first forming tool by forward rotation and advancing the second forming tool by reverse rotation. An end bending device before spring forming of the NC coiling machine described.