WO2018154953A1

WO2018154953A1 - Coil spring manufacturing device and coil spring manufacturing method

Info

Publication number: WO2018154953A1
Application number: PCT/JP2017/046239
Authority: WO
Inventors: 充弘杉山; 慶光小山; 古瀬　武志; 友祐熊川; 有史森
Original assignee: 日本発條株式会社
Priority date: 2017-02-27
Filing date: 2017-12-22
Publication date: 2018-08-30
Also published as: JP2018140399A; TWI658881B; TW201831242A; JP6704867B2

Abstract

This coil spring manufacturing device (30) includes a material supply part (31), a defect detecting device (33), a coiling machine (40), and a control unit (41). When a defect in a continuous material (1C) is detected by the defect detecting device (33), positional information about the defect is stored in a storage means (44) of the control unit (41). The continuous material (1C) is supplied to the coiling machine (40) regardless of the presence of defects, and coil springs are manufactured. The presence of defects in the continuous material (1C) supplied to the coiling machine (40) is determined on the basis of the defect position information stored in the control unit (41). In a sorting part, the shaped coil springs having defects are sorted out from defect-free coil springs. When a portion having a defect in the continuous material (1C) is coiled, shaping is performed such that the coil diameter and the number of turns are different from those of a typical coil spring.

Description

Coil spring manufacturing apparatus and coil spring manufacturing method

The present invention relates to a coil spring manufacturing apparatus for manufacturing a coil spring using a long continuous material and a method for manufacturing the coil spring.

There are various types of coil springs and they are used for various purposes. For example, a coil spring is used in a vehicle suspension system. Japanese Patent Application Laid-Open No. 11-197775 or Japanese Patent Application Laid-Open No. 2013-226484 discloses an example of a coil spring manufacturing apparatus. These are coiling machines that do not have a cored bar. This type of coiling machine includes a material guide, a first pin, a second pin, a pitch tool, and a control unit. The material of the coil spring fed from the tip of the material guide is bent into an arc shape by the first pin and the second pin. Further, the coil spring is pitched by the pitch tool. The positions of the first pin and the second pin are controlled based on a computer program stored in the control unit, control data corresponding to the shape of the coil spring, and the like.

The continuous material (element wire made of spring steel), which is the material of the coil spring, is usually subjected to drawing and heat treatment before being supplied to the coiling machine. The drawing process is performed by a die. The heat treatment is quenching or tempering. The long continuous material is wound in a hoop shape so that it is convenient for transportation and storage. Many coil springs can be manufactured from one continuous material. The hoop-like continuous material is placed on the material supply unit. The hoop-like continuous material is continuously supplied from the material supply unit toward the coiling machine. A coil spring having a predetermined coil diameter, pitch, and number of turns is formed by the coiling machine. A coiling machine using a continuous material can efficiently produce a coil spring.

Japanese Patent Laid-Open No. 11-197775 JP 2013-226484 A

The continuous material that is the material of the coil spring may be damaged before being delivered to the factory that manufactures the coil spring. A flaw occurring in the continuous material can be detected before the drawing process by a flaw detection apparatus using an eddy current. If scratches are found before the drawing process, the drawing process is stopped. Then, after correcting the damaged part by polishing or the like, the drawing process is resumed. In the case of a high-quality continuous material with few scratches, no particular problem arises. However, in the case of a continuous material with a relatively high frequency of scratches, the production line stops every time the scratches are corrected. For this reason, the production efficiency of the coil spring is greatly reduced.

An object of the present invention is to provide a coil spring manufacturing apparatus and a coil spring manufacturing method capable of suppressing a reduction in the production efficiency of the coil spring even if the continuous material is damaged.

The coil spring manufacturing apparatus according to one embodiment includes a material supply unit, a flaw detection device, a storage unit, a coiling machine, and a sorting unit. A continuous material that is a material of the coil spring is placed on the material supply unit. The flaw detection apparatus detects the presence or absence of a flaw in the continuous material supplied from the material supply unit. The storage means stores position information of a flaw when a flaw is detected by the flaw detection apparatus. The coiling machine forms a coil spring by coiling the continuous material that has passed through the flaw detection apparatus regardless of the presence or absence of scratches. The selecting unit stores a wound-free coil spring formed by a portion having no scratch on the continuous material and a wound coil spring formed by a portion having a scratch on the continuous material stored in the storage unit. Sort based on location information.

The sorting unit may include a robot that sorts the wound-free coil spring and the wound-shaped coil spring. The sorting unit may include a sorting mechanism that sorts the wound-free coil spring and the scratched coil spring. The sorting mechanism may move the wound-free coil spring toward the first transport unit and move the wound coil spring toward the second transport unit.

An example of a coiling machine includes a material feed roller, a material guide, a first pin, a second pin, a pitch tool, and a cutting tool. The material feed roller moves the continuous material in the length direction. The continuous material is inserted into the material guide. The continuous material fed from the front end of the material guide contacts the first pin. The second pin is disposed on the front side in the moving direction of the continuous material with respect to the first pin. An arc portion is formed by bending the continuous material between the first pin and the second pin. The pitch tool is disposed on the front side in the moving direction of the continuous material with respect to the second pin. The continuous material contacts the pitch tool. The cutting tool is disposed between the second pin and the pitch tool. The continuous material is cut between the cutting tool and a mandrel.

The positions of the first pin and the second pin of the coiling machine are controlled based on the position information stored in the storage means. For example, the coil diameter when coiling a portion where the continuous material is scratched is larger than the coil diameter when coiling a portion where the continuous material is not scratched. The position is controlled. Alternatively, the cutting tool may be controlled so that the number of turns when coiling a portion where the continuous material is scratched is smaller than the number of turns when coiling a portion where the continuous material is not scratched.

ADVANTAGE OF THE INVENTION According to this invention, even if there are some cracks in the material (continuous material) of a coil spring, it can suppress that the production efficiency of a coil spring falls, and manufactures many coil springs efficiently from one continuous material. Can do.

FIG. 1 is a plan view schematically showing an example of equipment for drawing a continuous material. FIG. 2 is a plan view schematically showing an example of equipment for performing heat treatment of a continuous material. FIG. 3 is a plan view schematically showing a coil spring manufacturing apparatus according to one embodiment. 4 is a side view of a part of the coiling machine of the coil spring manufacturing apparatus shown in FIG. FIG. 5 is a block diagram showing an electrical configuration of a control unit of the coil spring manufacturing apparatus. FIG. 6 is a flowchart showing the first embodiment of the manufacturing process of the coil spring. FIG. 7 is a perspective view illustrating an example of the transport unit. FIG. 8 is a plan view illustrating an example of the selection unit. FIG. 9 is a flowchart showing the second embodiment of the manufacturing process of the coil spring. FIG. 10 is a front view showing two types of coil springs having different shapes.

A coil spring manufacturing apparatus and a method of manufacturing a coil spring according to one embodiment will be described below with reference to FIGS.
FIG. 1 schematically shows a facility 10 for drawing a continuous material (long strand made of spring steel) 1A. The equipment 10 that performs the drawing process includes a material supply unit 11, a die unit 12, a winding unit 13, and the like. A continuous material 1 A wound in a hoop shape is placed on the material supply unit 11. The winding unit 13 has a rotatable drum.

The continuous material 1A placed on the material supply unit 11 may be referred to as a hoop material. The continuous material 1A may have a total length of several hundred meters (or more) when unwound. The continuous material 1 A fed out from the material supply unit 11 passes through the die unit 12. As a result, the diameter of the continuous material 1A decreases at a predetermined area reduction rate. The area reduction rate is, for example, 10 to 20%. The continuous material 1 B pulled out from the die portion 12 is wound up on the drum of the winding portion 13.

FIG. 2 schematically shows equipment 20 for heat treatment of the continuous material 1B. The equipment 20 for heat treatment includes a material supply unit 21, a quenching unit 22, a tempering unit 23, a winding unit 24, and the like. A continuous material 1B wound in a hoop shape is placed on the material supply unit 21. Induction hardening of the continuous material 1B is performed by the quenching part 22. In the tempering unit 23, the continuous material 1B is tempered. The winding unit 24 winds the tempered continuous material 1C.

The continuous material 1B fed out from the material supply unit 21 is heated to a quenchable temperature in the quenching unit 22 by high frequency induction heating. When the continuous material 1B immediately after being heated is rapidly cooled by a coolant such as water, a hardened structure is formed in the continuous material 1B. In the tempering part 23, after the continuous material 1B is reheated to an appropriate temperature, it is gradually cooled. The continuous material 1 C tempered in this way is wound up by the winding unit 24.

FIG. 3 shows a coil spring manufacturing apparatus 30 according to one embodiment. The coil spring manufacturing apparatus 30 includes a material supply unit 31, a straightener 32, a flaw detection device 33, a guide roller 34, a coiling machine 40, and a control unit 41. A hoop-like continuous material 1 C that is a material of a coil spring is placed on the material supply unit 31. The straight line machine 32 corrects the shape so that the continuous material 1C is substantially straight. The flaw detector 33 detects the presence or absence of a flaw on the continuous material 1C. The control unit 41 controls the coiling machine 40. One continuous material 1C has a length sufficient to manufacture a large number of coil springs. There is a possibility that the surface of the continuous material 1C is scratched for some reason.

The continuous material 1C fed from the material supply unit 31 passes through the linear machine 32. Further, the toner passes through the flaw detector 33 and is supplied toward the coiling machine 40 through the guide roller 34. The flaw detector 33 detects the presence or absence of a flaw on the surface of the continuous material 1C using, for example, eddy current. If there is a flaw detection device having reliability comparable to the eddy current method as the flaw detection device 33, it may be used.

The flaw detector 33 may detect a flaw having a size or depth exceeding the allowable value in the continuous material 1C. In that case, the position (position information regarding the length direction of the continuous material 1 C) where the scratch exists is stored in the storage means (memory) 44 of the control unit 41. The continuous material 1C is supplied to the coiling machine 40 regardless of the presence or absence of scratches, whereby the coil spring W1 is manufactured.

Coiling machine 40 manufactures coil spring W1 by forming continuous material 1C into a spiral shape. There are various forms of the coil spring W1. For example, various coil springs such as a cylindrical coil spring, a barrel coil spring, a drum coil spring, a taper coil spring, an unequal pitch coil spring, and a coil spring having a minus pitch portion may be used.

FIG. 4 schematically shows a part of the coiling machine 40. The coiling machine 40 includes a plurality of material feed rollers (feed rollers) 45, a material guide 46, a first pin 47, and a second pin 48. The material feed roller 45 moves the continuous material 1C, which is a material of the coil spring, in the direction indicated by the arrow F1 (the length direction of the continuous material 1C). The continuous material 1 C is inserted into the material guide 46. The continuous material 1 C sent out from the tip 46 a of the material guide 46 first comes into contact with the first pin 47. The continuous material 1 C bent by the first pin 47 is in contact with the second pin 48. Each of the first pin 47 and the second pin 48 may be a roller member that is rotatable about an axis, or may be a pin member that does not rotate.

The coiling machine 40 includes a pitch tool 50, a cutting tool 51, a mandrel 52, and the like. The pitch tool 50 is disposed on the front side in the moving direction of the continuous material 1 C with respect to the second pin 48. When the continuous material 1C bent by the second pin 48 contacts the pitch tool 50, the coil spring is pitched. The cutting tool 51 has a blade part 51a. The cutting tool 51 moves toward the mandrel 52 in the direction indicated by the arrow Z1 (shown in FIG. 4). Accordingly, the continuous material 1C is cut (sheared) between the receiving blade 52a of the mandrel 52 and the blade portion 51a.

FIG. 5 is a block diagram showing an electrical configuration of the control unit 41 and the like. The control unit 41 controls the coiling machine 40. The control unit 41 includes a CPU (Central Processing Unit) 60 that functions as a controller. The CPU 60 is connected to a ROM (Read Only Memory) 62, a RAM (Random Access Memory) 63, a communication interface unit 64, a display / operation driver 65, a material feed driver 66, a first pin moving driver 67 via a bus line 61. A second pin moving driver 68, a pitch tool driver 69, a cutting driver 70, and the like are connected.

The ROM 62 stores a program for controlling the CPU 60 and various fixed data. The RAM 63 includes various data necessary for forming the coil spring and a memory as the storage unit 44. The storage unit 44 stores the position information of the flaws of the continuous material 1C detected by the flaw detector 33. The communication interface unit 64 controls data communication performed with an external device via a communication line. The display / operation driver 65 controls the display operation unit 71. By operating the display operation unit 71, information necessary for coiling can be stored in a memory such as the RAM 63.

The material feed driver 66 controls a motor 80 for rotating the material feed roller 45. The first pin moving driver 67 controls an actuator 81 for driving the first pin 47. The second pin moving driver 68 controls an actuator 82 for driving the second pin 48. The pitch tool driver 69 controls an actuator 83 for driving the pitch tool 50. The cutting driver 70 controls an actuator 84 for driving the cutting tool 51.

The control unit 41 includes a CPU 60. The control unit 41 includes a control circuit that controls the rotation of the material feed roller 45, a control circuit that controls the positions of the first pin 47 and the second pin 48, a control circuit that controls the position of the pitch tool 50, and cutting. A control circuit for controlling the tool 51 is included. The control unit 41 controls the

actuators

81, 82, and 83 so that the positions of the first pin 47, the second pin 48, and the pitch tool 50 change according to the shape data of the coil spring. The shape data is, for example, the coil diameter, pitch, number of turns, and coil length, and is input to the control unit 41. A personal computer 85 can be connected to the control unit 41 via the communication interface unit 64. The personal computer 85 includes a storage medium 86 that can be attached and detached as necessary.

Next, a first embodiment of the manufacturing process of the coil spring will be described with reference to the flowchart of FIG.
In step ST 1 in FIG. 6, the continuous material 1 C is supplied to the flaw detector 33 through the linear machine 32. The continuous material 1C is placed on a material supply unit 31 (shown in FIG. 3). In step ST 2, the continuous material 1 C passes through the flaw detector 33. The flaw detector 33 inspects whether or not the surface of the continuous material 1C has a scratch having a size or depth exceeding the allowable value. If no flaw is detected (“NO” in step ST3), the process jumps to step ST5.

When a scratch exceeding the allowable value is detected (“YES” in step ST3), the process proceeds to step ST4. In step ST4, the position of the detected scratch (position in the length direction of the continuous material 1C) is stored in the storage means 44 of the control unit 41, and the process proceeds to step ST5.

In step ST5, the continuous material 1C is supplied to the coiling machine 40. That is, the continuous material 1C is supplied to the coiling machine 40 regardless of the presence or absence of scratches, and coiling is performed in step ST6.

Coiling machine 40 manufactures coil spring W1 based on a computer program stored in control unit 41 and shape data for control stored in a memory such as RAM 63. The operation of the coiling machine 40 is automated by the CPU 60. The control unit 41 forms (coiling) the coil spring W1 while changing the positions of the first pin 47, the second pin 48, and the pitch tool 50 according to the shape data of the coil spring. The shape data is, for example, the coil diameter, pitch, number of turns, coil length, and the like.

For example, as shown in FIG. 4, the continuous material 1C is continuously moved by the material feed roller 45 in the direction indicated by the arrow F1. The continuous material 1 C moves from the tip 46 a of the material guide 46 toward the first pin 47. The continuous material 1C is bent in an arc shape by the first pin 47 and the second pin 48 with the tip 46a of the material guide 46 as a starting point of bending. Thereby, circular arc part 1D is shape | molded continuously. When one coil spring is formed in this way, the cutting tool 51 is operated to cut the rear end of the coil spring, that is, the front end of the next formed coil spring.

In step ST7 in FIG. 6, it is determined whether or not the molded coil spring is damaged. That is, it is determined based on the position information of the wound sent from the storage means 44 whether or not the coil spring is formed by the scratched portion of the continuous material 1C. If it is determined in step ST7 that the coil spring W1 is not scratched (coil spring without scratch) ("NO" in step ST7), the process proceeds to step ST8. The wound-free coil spring is a coil spring formed by a portion having no scratch in the continuous material 1C.

In step ST8, the scratch-free coil spring W1 is sent to the next step by the transport unit 91 including a conveyor or the like in the sorting unit 90 shown in FIG. Here, the next process is, for example, a strain relief annealing process, a setting process, a shot peening process, or the like. The conveyor of the conveyance unit 91 continuously conveys the coil spring W1 in the direction indicated by the arrow F2.

If it is determined in step ST7 that the coil spring is flawed (coil spring having a flaw) ("YES" in step ST7), the process proceeds to step ST9. The wound coil spring is a coil spring formed by a scratched portion of the continuous material 1C. In step ST9, in the sorting unit 90, the wound coil spring W2 is sent, for example, by the robot 92 to the receiving unit for the recycling process. The robot 92 can hold the coil spring W 2 by a chuck 94 provided at the tip of the arm 93.

FIG. 8 shows a sorting unit 90A having a sorting mechanism 95 as another example of the sorting unit. The sorting mechanism 95 sorts the wound-free coil spring W1 and the scratched coil spring W2. The sorting unit 90 A includes a first transport unit 96 and a second transport unit 97. The wound-free coil spring W1 moves through the first transport unit 96. The wound coil spring W 2 moves to the second transport unit 97. The sorting mechanism 95 has a movable member 99. The movable member 99 is switched between the first position P1 and the second position P2 by the actuator 98. The movable member 99 moves to the first position P1 when the coiled coil spring is not damaged. The movable member 99 switches to the second position P2 when the coil spring is damaged.

For example, when the wound-free coil spring W1 is formed by the coiling machine 40 (“NO” in step ST7 in FIG. 6), the movable member 99 is at the first position P1. In step ST 8, the coil spring W 1 is sent to the first transport unit 96. In the case of the wound coil spring W2 (“YES” in step ST7 in FIG. 6), the movable member 99 moves to the second position P2. In step ST9, the wound coil spring W2 passes through the second transport unit 97 and is carried into a collection box 100 as a receiving unit for recycling processing.

According to the coil spring manufacturing apparatus 30 and the coil spring manufacturing method of the present embodiment, the coil spring is manufactured by the coiling machine 40 regardless of whether or not the long continuous material 1C is damaged. For this reason, a coil spring can be manufactured efficiently compared with the case where the production line is stopped and the flaw is corrected each time a flaw is detected as in the prior art. In particular, it is effective in suppressing a reduction in the productivity of the coil spring when a continuous material with relatively many scratches must be used.

As described above, the method for manufacturing the coil spring according to the present embodiment includes the following steps automated by the control unit 41.
(1) The continuous material 1C placed on the material supply unit 31 is moved toward the flaw detector 33,
(2) The flaw detector 33 detects the presence or absence of scratches on the continuous material 1C (flaw detection process),
(3) When it is detected that the continuous material 1C has a flaw, the position of the flaw is stored in the storage means (memory) 44 of the control unit 41,
(4) The continuous material 1C that has passed through the flaw detector 33 is supplied to the coiling machine 40 regardless of the presence or absence of scratches, and a coil spring is formed,
(5) Identifying a wound-free coil spring formed by a portion having no scratch on the continuous material 1C and a wound coil spring formed by a portion having a scratch on the continuous material 1C;
(6) The wound coil spring is sent to a receiving portion (receiving portion for recycling or the like) different from the conveying portion for the wound spring without scratch.

Next, a second embodiment of the coil spring manufacturing process will be described with reference to FIGS. FIG. 9 is a flowchart showing the manufacturing process of the coil spring. The coil spring manufacturing apparatus used in this manufacturing process is the same as the coil spring manufacturing apparatus 30 shown in FIGS.

9 is common to steps ST1 to ST5 of the manufacturing process of the first embodiment shown in FIG. 6 from step ST1 to step ST5. In step ST 1 in FIG. 9, the continuous material 1 C placed on the material supply unit 31 (shown in FIG. 3) is supplied to the flaw detector 33. In step ST2, it is inspected whether or not the surface of the continuous material 1C is flawed. If a flaw is detected (“YES” in step ST3), the process proceeds to step ST4. The position of the flaw (position information in the length direction of the continuous material 1C) is stored in the storage means 44 of the control unit 41, and the process proceeds to step ST5. In step ST5, the continuous material 1C is supplied to the coiling machine 40. Step ST10 is followed by step ST10.

In step ST10 in FIG. 9, it is determined whether or not the continuous material 1C supplied to the coiling machine 40 is damaged. If it is determined that the continuous material 1C is not damaged ("NO" in step ST10), the process proceeds to step ST11. When it is determined that the continuous material 1C has a scratch ("YES" in step ST10), the process proceeds to step ST12.

In step ST11, the coiling machine 40 forms a coil spring W1 having a normal shape using the continuous material 1C having no scratch. Here, the coil spring W1 having a normal shape is a coil spring having a predetermined coil diameter, pitch, coil length, and the like. FIG. 10 shows an example of a coil spring W1 having a normal shape. Since the operation of the coiling machine 40 when forming the normal coil spring W1 is the same as that of the first embodiment, the description thereof is omitted.

On the other hand, in step ST12, the coiling machine 40 forms the deformed coil spring W3 using the continuous material 1C having scratches. Here, the deformed coil spring W3 is a coil spring that clearly differs in shape from a normal coil spring. As shown in FIG. 10, the deformed coil spring W3 has a shape that can be distinguished from a normal coil spring W1 by visual observation. For example, when the deformed coil spring W3 is formed, the first pin 47 and the second pin 48 (in order that the coil diameter D2 of the deformed coil spring W3 is larger than the coil diameter D1 of the normal coil spring W1. The position shown in FIG. Alternatively, the control unit 41 controls the timing of cutting the coil spring by the cutting tool 51 so that the number of turns of the deformed coil spring W3 is smaller than that of the normal coil spring W1.

If coiled parts with continuous material flaws, stress may concentrate on the flaws in some cases, and the continuous material may break starting from the flaws. However, in the present embodiment, the deformed coil spring W3 is formed by enlarging the coil diameter in the portion where the continuous material is scratched. For this reason, it is relieved that stress concentrates on a crack, and the danger that a continuous material will break during coiling is controlled. Further, when coiling a portion having a scratch on the continuous material, the number of turns may be reduced. As a result, the length of the wound coil spring to be disposed of is reduced, and the waste of the material spent on the wound coil spring can be reduced as much as possible.

The formed coil springs can be selected, for example, visually by an inspector in step ST13 in FIG. A normal coil spring (coil spring W1 without damage) is sent to the next process. Here, the next process is, for example, a strain relief annealing process, a setting process, a shot peening process, or the like. Alternatively, the deformed coil spring W3 is selected from the normal coil spring W1 by a robot (shown in FIG. 7) or a sorting mechanism 95 (shown in FIG. 8). The deformed coil spring W3 is sent to a receiving part (such as a collection box) for disposal or recycling.

In carrying out the present invention, the structure and arrangement of elements constituting the coil spring manufacturing apparatus, including a material supply unit for placing a continuous material such as a hoop material, a flaw detection device, a coiling machine, a control unit, and a sorting unit. Needless to say, the embodiment of the present invention can be implemented with various modifications as required. In addition to the memory built in the control unit, various external memories (external storage media) may be used as storage means for storing the position information of the scratches.

DESCRIPTION OF SYMBOLS 1C ... Continuous material, W1, W2 ... Coil spring, W3 ... Deformed coil spring, 30 ... Coil spring manufacturing apparatus, 31 ... Material supply part, 33 ... Flaw detection apparatus, 40 ... Coiling machine, 41 ... Control part, 44 ... Memory | storage means 46 ... Material guide 47 ... First pin 48 ... Second pin 50 ... Pitch tool 51 ... Cutting tool 52 ... Mandrel

Claims

A material supply unit (31) for placing the continuous material (1C) which is a material of the coil spring (W1) (W2);
A flaw detector (33) for detecting the presence or absence of scratches on the continuous material (1C) supplied from the material supply unit (31);
When a flaw is detected by the flaw detector (33), storage means (44) for storing position information of the flaw,
A coiling machine (40) for forming a coil spring by coiling the continuous material (1C) that has passed through the flaw detector (33) regardless of the presence or absence of scratches;
The scratchless coil spring formed by a portion having no scratch on the continuous material (1C) and the wound coil spring formed by a portion having a scratch on the continuous material (1C) are stored in the storage means (44). Sorting unit (90) (90A) for sorting based on the stored position information;
A coil spring manufacturing apparatus comprising:
In the coil spring manufacturing apparatus according to claim 1,
The sorting section (90) (90A) includes a robot (92) that sorts the wound-free coil spring and the wound coil spring.
In the coil spring manufacturing apparatus according to claim 1,
The sorting section (90) (90A) has a sorting mechanism (95) for sorting the coil spring without scratch and the coil spring with scratch, and the sorting mechanism (95) uses the coil spring without scratch as a first one. It moves toward the conveyance part (96), The said coil spring with a damage | wound is moved toward the 2nd conveyance part (97).
In the coil spring manufacturing apparatus according to claim 1,
The coiling machine (40)
A material feed roller (45) for moving the continuous material (1C) in the length direction;
A material guide (46) into which the continuous material (1C) is inserted;
A first pin (47) with which the continuous material (1C) fed from the tip (46a) of the material guide (46) contacts;
The first pin (47) is disposed on the front side in the moving direction of the continuous material (1C) with respect to the first pin (47), and the first pin (47) is bent by bending the continuous material (1C) between the first pin (47). ) And a second pin (48) forming a circular arc portion (1D),
A pitch tool (50) disposed on the front side of the continuous material (1C) with respect to the second pin (48) and in contact with the continuous material (1C);
A cutting tool (51) disposed between the second pin (48) and the pitch tool (50) and cutting the continuous material (1C) with a mandrel (52);
It has.
In the coil spring manufacturing apparatus according to claim 4,
In the coiling machine (40), the coil diameter when coiling a portion of the continuous material (1C) with a scratch is larger than the coil diameter when coiling a portion of the continuous material (1C) without a scratch. The positions of the first pin (47) and the second pin (48) are controlled based on the position information stored in the storage means (44).
In the coil spring manufacturing apparatus according to claim 4 or 5,
The coiling machine (40) is configured so that the number of turns when coiling a portion of the continuous material (1C) with a scratch is smaller than the number of turns when coiling a portion of the continuous material (1C) without a scratch. The cutting tool (51) is controlled.
The flaw detector (33) detects whether the continuous material (1C) supplied from the material supply unit (31) is flawed,
When a flaw is detected by the flaw detector (33), the position information of the flaw is stored in the storage means (44),
The continuous material (1C) that has passed through the flaw detector (33) is supplied to a coiling machine (40) regardless of the presence or absence of a flaw to form a coil spring (W1) (W2),
The storage means (44) stores a wound-free coil spring formed by a portion having no scratch on the continuous material (1C) and a wound coil spring formed by a portion having a scratch on the continuous material (1C). Sorting based on the location information,
A method of manufacturing a coil spring, wherein the wound coil spring is sent to a receiving portion (100) different from the wound coil spring.
In the manufacturing method of the coil spring according to claim 7,
The coiling is performed so that the coil diameter when forming a portion of the continuous material (1C) with a flaw is larger than the coil diameter when forming the portion of the continuous material (1C) without a flaw.
In the manufacturing method of the coil spring according to claim 7 or 8,
The number of turns when coiling a portion of the continuous material (1C) with a scratch is made smaller than the number of turns when coiling a portion of the continuous material (1C) without a scratch.