JPH0739013B2 - Coil spring manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for manufacturing a coil spring using a linear rod-shaped material.

[0002]

2. Description of the Related Art Conventionally, an apparatus for manufacturing a hot-formed coil spring has a coiling machine equipped with a core for winding the material and a means for supplying the material to the coiling machine. When the material A is wound around the core metal, the material A is wound around the core metal while being twisted. When a flat bearing surface b is provided at the end portion like the coil spring a illustrated in FIG. 13, conventionally, the end portion of the coil spring a after molding is flattened by performing mechanical polishing with a grinder or the like. The seat surface b was molded. This flat bearing surface b is polished so as to be perpendicular to the central axis C of the spring. However, mechanical grinding with a grinder not only worsens the working environment,
The work required skill and the work efficiency was poor.

For this reason, recently, as shown in FIG. 14, the taper rolling portion e is formed in advance by rolling before coiling the material A, and when the coiling is performed, a flat seat of the taper rolling portion e is formed. A manufacturing method in which the orientation of the flat bearing surface b is controlled so that the surface b is wound perpendicularly to the spring central axis C tends to be adopted.

In this case, the flat bearing surface b which has been rolled in advance is used.
In order to wind the spring perpendicularly to the spring central axis C, the taper rolled portion e is constrained by a special gripping jig and the flat bearing surface b is wound so as to be perpendicular to the spring central axis C. . When performing such manual work, it is necessary to take into consideration that the rotating speed of the cored bar is reduced or the cored bar is rotated at a low speed from the beginning before the taper rolling part e is wound on the cored bar. Is.

[0005]

Therefore, in the conventional manufacturing of coil springs, manual work by a jig is required, which requires skill and is a dangerous and dangerous work. Therefore, coiling by mechanical force is required. Full automation of the work was desired. Further, it is described in JP-A-60-102242.
Place the rear end of the taper
A device that performs coiling while restrained by a control device.
However, in that case, the
Since a large torsional force is applied to the end of the rolling
The thickness of the taper is thin and the taper rolling part is deformed.
There is

[0006] Therefore, an object of the present invention, without resorting to manual so that the flat seat surface of the coil spring having a tapered rolling portion is a spring perpendicular to the central axis, to be able to take accurate winding
In both cases, the taper rolling part should be deformed in the twisting direction.
It is an object of the present invention to provide an apparatus for manufacturing a coil spring that can prevent the above .

[0007]

DISCLOSURE OF THE INVENTION A coil spring manufacturing apparatus of the present invention developed to achieve the above object is a coiling machine for spirally forming a linear rod-shaped material around a core metal, and the above-mentioned material. In a coil spring manufacturing apparatus provided with a material supply mechanism for supplying to the coiling machine, the material supply mechanism, the material provided with a taper rolling portion on the winding end side of the material toward the coiling machine. A transfer means for moving the material in the axial direction , a material for temporarily stopping the material at a predetermined position and a material for the core.
Stopper that retracts to a position where it does not interfere with the material when wound on gold, and the taper rolling part of the material stopped by the stopper can be moved to a position where it can be held and can rotate around the axis of the material. Housing and a pair of sandwiching arms sandwiching the flat bearing surface of the tapered rolling portion in the thickness direction
And an actuator that opens and closes the sandwich arm.
A rotation direction positioning unit having an eater; a chuck having a chuck for grasping the tip side of the material held at a predetermined rotation angle by the rotation direction positioning unit; and and a material insertion unit has the above
The material of the sandwich arm of the rotation direction positioning unit is the above.
The above flatness when the taper rolled part is wound around the core
So that the seat surface is almost perpendicular to the central axis of the coil spring,
Material to an angle that allows for the amount of twist of the material during coiling
The clamp arm is closed by rotating it about its axis.
After the flat seating surface is positioned by and
Close the chuck to grasp the tip side of the material,
After the chuck was closed, the material was held by the pinching arm.
An apparatus for manufacturing a coil spring, characterized in that the bundle is unwound .

[0008]

The rotary positioning unit is moved to the taper rolling section according to the length of the material. The pair of sandwiching arms sandwiching the tapered rolling portion in the thickness direction stand by in a state of being rotated at an angle such that the flat bearing surface of the tapered rolling portion can be held at a predetermined rotation angle. The predetermined rotation angle mentioned here is an angle at which the flatness of the flat seating surface is maintained when the material is wound on the cored bar. The angle is calculated back from the amount of twist generated in the material during coiling,
Or you can know by experience.

When the tapered arm is closed in the thickness direction by closing the sandwiching arm, the material is held by the chuck of the material insertion unit, and the material is fed into the coiling machine by the actuator. After the winding start end of the material is clamped by the coiling machine, the core metal rotates, whereby the material is twisted and wound around the core metal to form the coil spring.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. A coil spring manufacturing apparatus 1 shown in FIG. 1 includes a coiling machine 10 for spirally winding a linear rod-shaped material A, a material supply mechanism 11 for supplying the material A to the coiling machine 10, and the coiling machine. A control circuit (not shown) including a computer for controlling the operations of 10 and the material supply mechanism 11 by numerical control is provided.

First, regarding the details of the material supply mechanism 11,
This will be described with reference to FIGS. 2 to 9. As shown in FIG. 2, the material supply mechanism 11 includes a base 15 extending in the horizontal direction. A roller assembly 16 is provided on the base 15 as an example of a transfer means for feeding the material A in the longitudinal direction (direction of arrow F0 in the figure).

The roller assembly 16 includes a guide rail 20 extending along the longitudinal direction (axial direction) of the material A, a movable table 21 capable of reciprocating along the guide rail 20, and the movable table 21 in the above direction. The actuator 22 to be moved, a plurality of feed rollers 23 provided on the movable table 21, and the feed rollers 23.
A power transmission member 2 such as a belt or a chain for rotating each feed roller 23 in conjunction with a motor 24 for rotating
5 and the like. The plurality of feed rollers 23 are arranged at a predetermined interval from each other. These feed rollers 23 are rotated in the feeding direction of the material A by a motor 24.

The table driving actuator 2 in the illustrated example
2 is an air cylinder or a hydraulic cylinder
The cylinder elements 30 and 31 of the book are connected in series. The rods 32, 33 of each cylinder element 30, 31 are
The operating strokes are different from each other. The movable table 21 can be stopped at any one of four positions in the longitudinal direction of the material A by selecting a combination of the extension side stroke end and the contraction side stroke end of the rods 32 and 33. In addition, the cylinder elements 30, 31
Instead of, the movable table 21 may be moved to a desired position by a combination of a servo motor and a ball screw mechanism or the like.

A rotation direction positioning unit 35 for positioning the taper-rolled portion e of the material A at a desired rotation angle is provided on the side of the roller assembly 16. The rotation direction positioning unit 35 includes a guide member 36 extending in the feed direction of the material A, a screw shaft 37 arranged in parallel with the guide member 36, a servomotor 38 capable of rotating the screw shaft 37 in the forward and reverse directions, A slider 39 having a built-in ball nut screwed onto the screw shaft 37, a positioning head 40 mounted on the slider 39, and the like are provided.

The positioning head 40 is mounted on the roller assembly 1 along a guide member 45 provided on the slider 39.
6 can be moved in a direction in which the material A approaches and separates, that is, a direction orthogonal to the passage line P of the material A. The positioning head 40 can be moved in the above direction by an actuator 46 using a cylinder mechanism or the like.

An example of the positioning head 40 is shown in FIG. The positioning head 40 includes a base member 50. The base member 50 includes a cylindrical portion 51 and a motor mounting portion 52, and the motor mounting portion 52 is provided with a servo motor 53. A drive gear 54 is attached to the output shaft of the servo motor 53.

A rotary housing 55 is supported on the cylindrical portion 51 by a bearing 56 so as to be rotatable in the direction around the axis of the material passage line P. The rotary housing 55 has a hollow hole 58 whose both ends are open, and the material A is inserted into the hollow hole 58. Rotating housing 5
5, the driven gear 59 provided on the outer peripheral portion of
Meshes with.

A bracket portion 60 provided on the rotary housing 55 is provided with a pair of shafts 61 and 62 extending in a direction perpendicular to the material passage line P. These axes 61,
A slide block 65, 66 is provided at 62 so as to be movable in the axial direction of the shaft 61, 62. The slide blocks 65 and 66 can be smoothly moved by the slide bearings 67 and 68.

As shown in FIGS. 4 and 5, racks 70, 7 are provided at the mutually opposing portions of the slide blocks 65, 66.
1 is provided, and a pinion 72 that meshes with the racks 70 and 71 is provided. The pinion 72 is rotatably supported by a shaft 73 fixed to the bracket portion 60. One slide block 66 is provided with a rod portion 78 of an actuator 77 using an air cylinder or the like.
Are connected. When the slide block 66 moves in the axial direction of the shaft 62 due to the expansion and contraction of the rod portion 78, the other rack 70 moves in the opposite direction via the pinion 72, so that the pair of slide blocks 65, 66 move in opposite directions. Moving.

Bearing members 83, 84 having spline grooves 81, 82 are provided on the slide blocks 65, 66. Spline shafts 85 and 86 are inserted into the spline grooves 81 and 82. Spline shaft 85,
86 is provided in parallel with the shafts 61 and 62.

The opening / closing member 8 is attached to the spline shafts 85 and 86.
7, 88 are fitted together. The sandwiching arms 91 and 92 are attached to the tip ends of the opening / closing members 87 and 88 in parallel with each other. The sandwiching arms 91, 92 have a length such that the material A can be sandwiched from both sides. Pinch arm 9
A shallow groove 93 (see FIG. 7) is provided on the mutually opposing surfaces of 1, 92.

A gear 9 is attached to the bases of the spline shafts 85 and 86.
6,97 are attached. A drive rack 98 having teeth on both sides meshes with the gears 96 and 97. The drive rack 98 is a direct acting actuator 100 such as an air cylinder.
Depending on the direction in which the spline shafts 85 and 86 are rotated,
That is, the opening / closing members 87, 88 are driven in the direction of opening / closing. The actuator 100 is provided with a sensor 101 that detects that the opening / closing members 87 and 88 are closed.

As shown in FIG. 2 and the like, a stopper 105 is provided at the end of the base 15. This stopper 105
Can be moved by an actuator (not shown) between a position where the advance of the winding start end f of the material A is blocked and a retracted position where the advance of the material A is allowed. As shown in FIG. 3, the stopper 105
A sensor 106 using an optical proximity switch or the like is arranged in the vicinity of, and the winding start end f of the material A is stopped by the stopper 105.
It is possible to detect that the vehicle has come into contact with and stopped.

A material insertion unit 110 is provided at the end of the base 15. Material insertion unit 110
Is a guide 111 along the feed direction of the material A, an insertion table 112 movable along the guide 111 in the feed direction of the material A, and an actuator 113 such as an air cylinder for driving the insertion table 112 in the above direction. A chuck 115 that can hold the material A, an actuator 116 that opens and closes the chuck 115, and the like are configured.

An example of the coiling machine 10 is shown in FIGS. Coiling machine 1 in the illustrated example
Reference numeral 0 is a servo control type by NC control, which includes a core metal 130 around which the material A is wound, a clamp 131 which holds the winding start end f of the material A, and a guide member 132 which is provided in parallel with the core metal 130. Guide roll unit 133 movably provided along the guide member 132
And a ball screw 134 for moving the guide roll unit 133 in the above-mentioned direction, a cored bar driving head 135, and the like. Instead of using the ball screw 134, the position of the guide roll unit 133 may be directly controlled by a hydraulic servo cylinder or the like.

The guide roll unit 133 includes a carriage base 140, a fixed guide roll 141 provided on the lower surface side of the carriage base 140, a movable guide roll 142, a winding guide roll 143 and the like. The movable side guide roll 142 includes the link 14
It is attached to the end of 5.

The link 145 is connected to the pin 1 by an actuator 146 such as a hydraulic cylinder or an air cylinder.
It is possible to rotate around 47. That is, the movable side guide roll 142 can be moved in the direction in which the movable side guide roll 142 comes in contact with and separates from the fixed side guide roll 141. As shown in FIG. 11, a bearing 148 for smooth rotation is provided between the link 145 and the pin 147. Guide rolls 141, 142
Also, a bearing 149 is provided.

The winding guide roll 143 is rotatably supported by a bearing unit 150 provided on the carriage base 140. Entrainment guide roll 143
Has a flange portion 151. Flange 151
Guides the flat bearing surface b by contacting the material A being coiled and by contacting the flat bearing surface b of the tapered rolling portion e at the end of the coiling.

Next, the operation of the coil spring manufacturing apparatus 1 having the above structure will be described. The positioning head 40 is moved to the taper rolling portion e of the material A based on the data regarding the length of the material A which is input in advance to the control circuit. When the positioning head 40 moves in the above direction, the positioning head 40 is retracted by the actuator 46 in the direction of arrow F1 in FIG. 2 so as not to collide with the feed roller 23. In this state,
As the servo motor 38 rotates, the positioning head 40 is moved to the taper rolling portion e.

After that, the actuator 46 is actuated to the extension side, so that the positioning head 40 is returned to the position where it enters between the feed rollers 23. At this time, depending on the position of the positioning head 40, the positioning head 40 may collide with the feed roller 23. Therefore, in order to avoid the collision, the actuator 22 is operated so that the position of the entire roller assembly 16 is indicated by an arrow. The positioning head 40 is moved in the F2 direction by an appropriate amount so that the positioning head 40 can enter between the feed rollers 23, 23.

On the other hand, in the rotational direction positioning unit 35, the rotation angle of the flat bearing surface b that allows the flat bearing surface b to be wound perpendicularly to the spring center axis C is input to the control circuit. The input data is determined by back-calculating the amount of twist generated during coiling, or based on experimental values. Then, the rotary housing 55 is rotated by the motor 53 so that the sandwiching arms 91, 92 are set at the above-mentioned angle. Pinch arms 91, 9
2 and the chuck 115 are in an open state.

The material A is heated to an austenitizing temperature by a furnace (not shown) and supplied onto the feed roller 23. Since the feed roller 23 is constantly rotating in one direction, the material A moves through the hollow hole 58 of the rotary housing 55 toward the stopper 105.

After the material A hits the stopper 105 and stops, the actuator 100 of the positioning head 40 is actuated and the opening / closing members 87, 88 move in the closing direction, whereby the flat bearing surface b is sandwiched by the sandwiching arms 91, 92. In this case, as shown in FIG.
When the flat seating surface b is sandwiched by 1 and 92 in the thickness direction and the inter-arm distance G becomes equal to or less than a predetermined value, the actuator 10
By operating the sensor 101 provided at 0,
It is detected that the flat seat surface b is correctly sandwiched in the thickness direction.

As shown in FIG. 8, when the flat bearing surface b is not sandwiched in the thickness direction, the slide block driving actuator 77 operates to move the slide blocks 65 and 66 alternately. Pinch arm 9
1,92 are moved alternately as if rubbing hands. Moreover, since the shallow grooves 93 are provided on the mutually opposing surfaces of the sandwiching arms 91 and 92 to prevent slipping, the sandwiching arms 91 and 92 move alternately, so that the flat seating surface b is changed as shown in FIG. Will be sandwiched in the thickness direction. Since the rotating housing 55 is rotated by a predetermined angle, the flat arms b are supported by the sandwiching arms 91 and 92.
Is sandwiched in the thickness direction, the flat seat surface b is held at a predetermined angle.

After that, the chuck 115 of the material insertion unit 110 is closed, the material A is grasped by the chuck 115, and the stopper 105 is retracted to a position permitting the material A to advance. Also, the pinching arm 9
1,92 opens. And actuator 1 for material insertion
By the operation of 13, the winding start end f of the material A passes through the guide roll unit 133 of the coiling machine 10 and is inserted into the clamp 131 of the core bar 130. When this material is inserted, the movable roll 142 of the guide roll unit 133 is moved in the opening direction by the actuator 146 with respect to the fixed roll 141. The winding guide roll 143 is retracted to a position where it does not interfere with the clamp 131.

The core metal driving head 135 is rotated by a servo motor (not shown), the core metal 130 is rotated, and the ball screw 134 is rotated at a predetermined rotation speed, so that the material A is wound on the core metal 130. Meanwhile, the guide roll unit 133 moves in the axial direction of the core bar 130.

The winding guide roll 143 retracted to a position where it does not interfere with the clamp 131 at the beginning of winding is the core 1
When there is no possibility of causing interference with the clamp 131 due to the rotation of the 30, it moves toward the core bar 130. In this way, the material A is constrained between the winding guide roll 143 and the core 130. Also, material A
Is the fixed side guide roll 141 and the movable side guide roll 1.
The position of the cored bar 130 in the axial direction is regulated by being sandwiched between the cored bar 130 and 42. Material A is core metal 1
The material A is guided while the moving speed of the guide roll unit 133 is controlled based on the data input in advance to the control circuit so that the material A is wound around the 30 at a predetermined pitch.

The material A fed into the coiling machine 10 is set in advance by the rotational direction positioning unit 35 so that the flat bearing surface b is wound up perpendicularly to the spring center axis C, but with the progress of coiling. Due to variations in friction and slippage between the material A, the core bar 130, and the guide roll unit 133, there may be some variations in the perpendicularity of the flat bearing surface b at the end of the coiling.

However, the coiling machine 10 of this embodiment is used.
When the flat seat surface b approaches the core bar 130, the flat seat surface b is sandwiched by the guide rolls 141 and 142 in the thickness direction, and the flat seat surface b is wound into the guide roll until just before the core bar 130 is wound up. By contacting the flange portion 151 of 143, the verticality is maintained. Therefore, the perpendicularity of the flat bearing surface b with respect to the spring central axis C becomes extremely accurate.

[0040]

According to the present invention, it is possible to perform accurate coiling so that the flat bearing surface of the taper rolling portion provided on the winding end side of the material is perpendicular to the spring center axis, and at that time Is fully automatic and the taper rolling section
The coil spring can be molded with high precision without causing twisting deformation .

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a coil spring manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing a material supply mechanism in the apparatus shown in FIG.

FIG. 3 is a sectional view of a rotational direction positioning unit in the material supply mechanism shown in FIG.

FIG. 4 is a plan view showing a part of a cross section of the rotation direction positioning unit shown in FIG.

5 is a cross-sectional view taken along the line VV in FIG.

6 is a bottom view of a part of the rotational direction positioning unit shown in FIG.

FIG. 7 is a front view showing a part of a sandwiching arm of the positioning unit shown in FIG.

8 is a front view showing an operation mode of a sandwiching arm of the positioning unit shown in FIG.

9 is a front view showing another operation mode of the sandwiching arm of the positioning unit shown in FIG.

FIG. 10 is a front view of a coiling machine in the coil spring manufacturing apparatus shown in FIG.

11 is a cross-sectional view of a coiling machine in the coil spring manufacturing apparatus shown in FIG.

FIG. 12 is a bottom view of the coiling machine in the coil spring manufacturing apparatus shown in FIG. 1.

FIG. 13 is a front view showing an example of an end portion of a coil spring.

FIG. 14 is a perspective view showing an example of an end portion of a material.

[Explanation of symbols]

A ... Material, a ... Coil spring, b ... Flat bearing surface, e ... Tapered rolling part, 1 ... Coil spring manufacturing device, 10 ... Coiling machine, 11 ... Material supply mechanism, 16 ... Roller assembly (transfer means), 23 ... Feed roller, 35 ... Rotating direction positioning unit, 55 ... Rotating housing, 91, 92
... sandwiching arm, 110 ... material insertion unit, 130 ... core metal, 141, 142 ... guide roll, 143 ... winding guide roll, 151 ... flange portion.

Claims (3)

[Claims] 1. A coiling machine (10) for forming a linear rod-shaped material (A) around a core metal (130) to form a spiral shape.
And a material supply mechanism (11 ) for supplying the material (A) to the coiling machine (10) , in the coil spring manufacturing apparatus, the material supply mechanism (11) has a taper rolling portion on the winding end side. and transfer means for moving the material (e) is provided with (a) in the axial direction of the material (a) toward the coiling machine (10) (16), said material (a) temporarily in place Stop and wind the material (A) around the core metal (130).
Stopper (105) that retracts to a position that does not interfere with the material (A )
And a housing that can be moved to a position where it can hold the tapered rolling part (e) of the material (A) stopped by the stopper (105) and that can rotate around the axis of the material (A).
(55) and a pair of sandwiching arms (91, 92) sandwiching the flat bearing surface (b) of the taper rolling portion (e) in the thickness direction.
Actuator (1) that opens and closes the sandwiching arm (91, 92)
A rotation direction positioning unit with a 00) (35) has a chuck (115) for grasping the front end side of the the rotation direction positioning unit (35) is held at a predetermined rotation angle material (A) and the material the winding starting end of the (a) comprises a, a material insertion unit (110) that includes an actuator (113) for feeding to the coiling machine (10), the rotational position
The clamping arm (91, 92) of the deciding unit (35) is made of material (A).
The core bar (130) is wound up to the taper rolling section (e).
The flat seat surface (b) is almost
The amount of twist of material (A) during coiling so that it is vertical
Rotate the material (A) around the axis to the angle
Is, the by the scissors arms (91, 92) is closed
After the flat seating surface (b) is positioned, the chuck (1
15) Close and hold the tip of the material (A),
After the chuck (115) is closed, the pinching arm (91,92)
The coil spring manufacturing apparatus is characterized in that the constraint of the material (A) due to is released . 2. The rotation direction positioning unit (35) comprises the pair of sandwiching arms (91, 92) for the taper rolling section.
With (e) sandwiched, the parallel relationship of each sandwiching arm (91, 92)
While holding each of the sandwiching arms (91, 92) and the axis of the material (A)
Means for moving in opposite directions relative to each other at right angles (70,
According to claim 1, characterized in that it comprises a 71,72,77)
Coil spring manufacturing equipment . 3. The coiling machine (10) is made of the material described above.
A pair of guide rolls (141, 142) for guiding the core metal (130) in the axial direction with the material (A) sandwiched so that (A) is wound around the core metal (130) at a predetermined pitch, and material (a) comprises a metal core pressed entrainment guide roll (130) (143), yet the outer peripheral portion of the entrainment guide roll (143), the tapered rolling portion of the material (a) (e claim 1) flange portion for guiding the (151), characterized in that the provided
The manufacturing apparatus for the coil spring described .