TWI658881B - Coil spring manufacturing device and method - Google Patents

Abstract

The coil spring manufacturing apparatus includes a material supply section, a flaw detection device, a winding machine, and a control section. When a flaw in the continuous material is detected by the flaw detection device, the position information of the flaw is stored in a memory device of the control section. Regardless of whether the continuous material is defective, it is supplied to a winding machine to manufacture a coil spring. Whether the continuous material supplied to the winding machine is defective is judged based on the position information of the defect stored in the control section. The formed defective coil spring is selected from the non-defective coil spring in the selection section. When winding a defective part of a continuous material, it is shaped so that the coil diameter or the number of turns is different from that of a general coil spring.

Description

Coil spring manufacturing device and method

FIELD OF THE INVENTION The present invention relates to a coil spring manufacturing apparatus and a coil spring manufacturing method for manufacturing a coil spring using a long continuous material.

BACKGROUND OF THE INVENTION Coil springs are of various types and are used in various applications. For example, a coil spring is used in a suspension device of a vehicle. An example of a coil spring manufacturing apparatus is disclosed in Japanese Patent Application Laid-Open No. 11-197775 or Japanese Patent Application Laid-Open No. 2013-226584. These are winding machines without mandrels. This type of winding machine includes a material guide section, a first pin, a second pin, a pitch tool, and a control section. The material of the coil spring sent from the front end of the material guide is bent into an arc shape by the first pin and the second pin. Furthermore, the coil spring is given a pitch by the aforementioned pitch tool. The positions of the first pin and the second pin are controlled based on a computer program stored in the control unit and control data corresponding to the shape of the coil spring.

The continuous material (bare wire made of spring steel), which is the material of the coil spring, is usually subjected to extension processing and heat treatment before being supplied to the winding machine. The aforementioned drawing process is performed by a mold. The heat treatment is quenching or tempering. The long continuous material is wound into a hoop shape for easy handling or storage. Multiple coil springs can be manufactured from one continuous material. The hoop-shaped continuous material is placed on the material supply section. The hoop-shaped continuous material is continuously supplied toward the winding machine from the material supply unit. Furthermore, the coil spring is formed into a coil spring having a predetermined coil diameter, pitch, and number of turns by a winding machine. Coil springs can be efficiently produced using coil winding machines made of continuous material.

[Preceding Technical Documents] [Patent Documents] [Patent Documents 1] Japanese Patent Laid-Open No. 11-197775 [Patent Document 2] Japanese Patent Laid-Open No. 2013-226584

SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] Prior to delivery of a coil spring made of a continuous material to a workshop for manufacturing coil springs, defects may occur. Defects in continuous steel can be detected by the eddy current detection device before the extension process. If a defect is found before the extension process, the extension process is stopped. In addition, the defects are corrected by grinding or the like, and then the drawing process is started. If it is a high-quality continuous material with few defects, no particularly large problem will occur. However, if it is a continuous material with a high frequency of defects, the production line will be stopped every time the defect is corrected. Therefore, 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 decrease in the production efficiency of a coil spring even if a continuous material is defective. [Means for solving problems]

A coil spring manufacturing apparatus according to one embodiment includes a material supply section, a flaw detection device, a memory device, a winding machine, and a selection section. A continuous material, which is a material of the coil spring, is placed in the material supply section. The flaw detection device is used to detect the presence or absence of defects in the continuous material supplied from the material supply unit. When the memory device detects a defect by the flaw detection device, the memory device stores position information of the defect. The winding machine is configured to form a coil spring regardless of whether the continuous material passing through the flaw detection device is defective. The selection unit selects a non-defective coil spring formed from the non-defective portion of the continuous material and a defective coil spring formed from the non-defective portion of the continuous material based on the position information stored in the memory device.

The selection section may include a robot for classifying the non-defective coil spring and the defective coil spring. The selection section may also have a classification mechanism for distinguishing the non-defective coil spring from the defective coil spring. The classification mechanism may move the non-defective coil spring toward the first transfer section, and may move the defective coil spring toward the second transfer section.

An example of the winding 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 a longitudinal direction. The continuous material is inserted into the material guide. The continuous material sent from the front end of the material guide is in contact with 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 aforementioned 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 the mandrel.

The positions of the first pin and the second pin of the winding machine are controlled based on the position information stored in the memory device, respectively. For example, the position of the first pin and the second pin is controlled such that the coil diameter when winding a defective portion of the continuous material is larger than the coil diameter when winding a non-defective portion of the continuous material. . Alternatively, the cutting tool may be controlled so that the number of turns when the defective portion of the continuous material is wound is smaller than the number of turns when the non-defective portion of the continuous material is wound. [Inventive effect]

According to the present invention, even if the material (continuous material) of the coil spring has some defects, the production efficiency of the coil spring can be suppressed from being reduced, and a plurality of coil springs can be efficiently manufactured from one continuous material.

Detailed Description of the Preferred Embodiment Hereinafter, a coil spring manufacturing apparatus and a coil spring manufacturing method according to one embodiment will be described with reference to Figs. 1 to 7.

FIG. 1 schematically shows an apparatus 10 for performing an extension process of a continuous material (a long bare wire made of spring steel) 1A. The equipment 10 for performing the extension processing includes a material supply section 11, a mold section 12, a winding section 13, and the like. A continuous material 1A wound in a hoop shape is placed on the material supply portion 11. The winding section 13 includes a rotatable drum.

The continuous material 1A placed on the material supply section 11 is sometimes called a hoop material. The continuous material 1A has a length of several hundred meters (or more) when unwound. The continuous material 1A drawn from the material supply portion 11 passes through the mold portion 12. Thereby, the diameter of the continuous material 1A is reduced by a predetermined reduction ratio. The reduction ratio is, for example, 10 to 20%. The continuous material 1B extended from the mold part 12 is wound around the drum of the winding part 13.

FIG. 2 schematically shows an apparatus 20 for performing heat treatment of the continuous material 1B. The equipment 20 for heat treatment includes a material supply section 21, a quenching section 22, a tempering section 23, a winding section 24, and the like. A continuous material 1B wound in a hoop shape is placed on the material supply unit 21. The quenching part 22 performs high frequency quenching of the continuous material 1B. In the tempering section 23, tempering of the continuous material 1B is performed. The coiling unit 24 is used to coil the tempered continuous material 1C.

The continuous material 1B drawn from the material supply portion 21 is heated to a quenchable temperature in the quenching portion 22 by high-frequency induction heating. The continuous material 1B immediately after heating is rapidly cooled by a cooling material such as water, thereby forming a quenched structure in the continuous material 1B. In the tempering section 23, the continuous material 1B is gradually heated after it is reheated to an appropriate temperature. The tempered continuous material 1C is wound up in 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 section 31, a straightener 32, a flaw detection device 33, a guide roller 34, a winding machine 40, and a control section 41. On the material supply portion 31, a continuous material 1C that is a material of a coil spring and has a hoop shape is placed. The straightener 32 is used to correct the shape so that the continuous material 1C is almost straight. The flaw detection device 33 detects the presence or absence of defects in the continuous material 1C. The control unit 41 controls the winding machine 40. One continuous material 1C has a length sufficient to manufacture a plurality of coil springs. On the surface of the continuous material 1C, defects may occur for any reason.

The continuous material 1C drawn from the material supply section 31 passes through a leveler 32. Further, it is supplied to the winding machine 40 by the flaw detection device 33 through the guide roller 34. The flaw detection device 33 detects the presence or absence of a defect on the surface of the continuous material 1C by using, for example, an eddy current. The flaw detection device 33 can also be used if it has a flaw detection device with reliability comparable to the eddy current method.

With the flaw detection device 33, defects exceeding the allowable value in size or depth are found in the continuous material 1C. At this time, the position (the position information about the longitudinal direction of the continuous material 1C) of the defective place is stored in the storage device (memory) 44 of the control unit 41. This continuous material 1C is supplied to the winding machine 40 regardless of the presence or absence of a defect, thereby manufacturing the coil spring W1.

The coiler 40 shapes the continuous material 1C into a spiral shape, thereby manufacturing the coil spring W1. There are various forms of the coil spring W1. For example, it is represented by a cylindrical coil spring, and can also be a coil coil spring in various forms, such as a barrel coil spring, a drum coil spring, a conical coil spring, an unequal-space coil spring, a coil spring having a negative pitch, and the like.

FIG. 4 schematically shows a part of the winding machine 40. The winding 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 of the coil spring material in the direction indicated by the arrow F1 (the length direction of the continuous material 1C). The continuous material 1C is inserted into the material guide 46. The continuous material 1C sent from the front end 46 a of the material guide 46 first contacts the first pin 47. The continuous material 1C bent by the first pin 47 contacts the second pin 48. Each of the first pin 47 and the second pin 48 may be a roller member that can freely rotate around the shaft, or a pin member that does not rotate.

The winding 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 1C with respect to the second pin 48. The continuous material 1C bent by the second pin 48 is brought into contact with the pitch tool 50, and thereby the pitch of the coil spring is created. The cutting tool 51 includes a blade portion 51a. The cutting tool 51 moves toward the mandrel 52 in a direction shown by an arrow Z1 (shown in FIG. 4). Thereby, the continuous material 1C is cut (sheared) between the bottom knife 52a and the knife part 51a of the mandrel 52.

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

The ROM 62 stores programs or various fixed data for controlling the CPU 60. The RAM 63 includes various materials required for coil spring forming, or a memory as the memory device 44. The memory device 44 stores position information and the like of the defects of the continuous material 1C detected by the flaw detection device 33. The communication interface portion 64 controls data communication between the communication interface portion 64 and an external device through a communication line. The display / operation driver 65 is used to control the display operation section 71. By operating the display operation section 71, information required for winding can be stored in a memory such as the RAM 63.

The material feed driver 66 is a motor 80 that controls the rotation of 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 section 41 includes: a control circuit for controlling the rotation of the material feed roller 45; a control circuit for controlling the positions of the first pin 47 and the second pin 48; and a control for controlling the position of the pitch tool 50 A circuit; and a control circuit for controlling the cutting tool 51. 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 are changed in accordance with the shape data of the coil spring. The shape data is, for example, a coil diameter or pitch, a number of turns, and a coil length, and is input to the control unit 41. The control unit 41 can be connected to a personal computer 85 through a communication interface 64. The personal computer 85 may include a removable storage medium 86 as needed.

Next, a first embodiment of a manufacturing process of the coil spring will be described with reference to a flowchart of FIG. 6.

In step ST1 in FIG. 6, the continuous material 1C is supplied to the flaw detection device 33 through the leveler 32. The continuous material 1C is placed on a material supply unit 31 (as shown in FIG. 3). In step ST2, the continuous material 1C passes the flaw detection device 33. Whether the surface of the continuous material 1C has a defect having a magnitude or depth exceeding an allowable value is inspected by a flaw detection device 33. If no defect is detected (NO in step ST3), the process proceeds to step ST5.

If a defect exceeding the allowable value is detected (YES in step ST3), the process proceeds to step ST4. In step ST4, the position of the detected defect (the position in the longitudinal direction of the continuous material 1C) is stored in the memory device 44 of the control unit 41, and the process proceeds to step ST5.

In step ST5, the continuous material 1C is supplied to the winding machine 40. That is, the continuous material 1C is supplied to the winding machine 40 regardless of whether or not the continuous material 1C is defective, and is wound in step ST6.

The winding machine 40 manufactures the coil spring W1 based on a computer program stored in the control unit 41 and control shape data stored in a memory such as the RAM 63. The operation of the winding machine 40 can be automated by the CPU 60. The control unit 41 changes the respective positions of the first pin 47 and the second pin 48 and the pitch tool 50 in accordance with the shape data of the coil spring, and forms (coils) the coil spring W1. The shape information is, for example, a coil diameter or pitch, a number of turns, a coil length, and the like.

For example, as shown in FIG. 4, the continuous material 1C is continuously moved in the direction shown by the arrow F1 by the material feed roller 45. The continuous material 1C moves from the front end 46 a of the material guide 46 toward the first pin 47. This continuous material 1C is curved from the front end 46 a of the material guide 46 as a starting point, and is bent into an arc shape by the first pin 47 and the second pin 48. Thereby, the arc portion 1D is continuously formed. In this way, after one coil spring is formed, the cutting tool 51 is operated to cut off the rear end of the coil spring, that is, the front end of the coil spring to be formed next.

In step ST7 in FIG. 6, it is determined whether there is a defect in the formed coil spring. That is, it is determined whether the coil spring is formed from the defective portion of the continuous material 1C based on the position information of the defect sent from the memory device 44. If it is determined in step ST7 that the coil spring W1 is not defective (non-defective coil spring) (NO in step ST7), the process proceeds to step ST8. The non-defective coil spring is a coil spring formed from a non-defective portion of the continuous material 1C.

In step ST8, in the selection section 90 shown in FIG. 7, the non-defective coil spring W1 is sent to the next program by a transfer section 91 including a conveyor belt or the like. Here, the next procedure is, for example, a stress relief annealing step, a standing step, a beading step, and the like. The conveyor belt of the conveyance unit 91 continuously conveys the coil spring W1 in a direction indicated by an arrow F2.

If it is determined in step ST7 that the coil spring is defective (defective coil spring) (YES in step ST7), the process proceeds to step ST9. The defective coil spring is a coil spring formed from a defective portion of the continuous material 1C. In step ST9, the defective coil spring W2 in the sorting section 90 is sent to the receiving section for recycling processing by, for example, the robot 92. The robot 92 can hold the coil spring W2 by a clamp 94 provided at the front end of the arm 93.

FIG. 8 shows another example of the selection unit 90A including the classification unit 95. The classification mechanism 95 distinguishes the non-defective coil spring W1 from the defective coil spring W2. The selection section 90A includes a first transfer section 96 and a second transfer section 97. The non-defective coil spring W1 moves in the first conveyance unit 96. The defective coil spring W2 moves in the second conveyance unit 97. The classification mechanism 95 includes a movable member 99. The movable member 99 is switched between the first position P1 and the second position P2 by an actuator 98. If there is no defect in the wound coil spring, the movable member 99 moves to the first position P1. When the coil spring is defective, the movable member 99 is switched to the second position P2.

For example, when the non-defective coil spring W1 is formed by the winding machine 40 (NO in step ST7 in FIG. 6), the movable member 99 is located at the first position P1. Next, in step ST8, the coil spring W1 is sent to the first transfer unit 96. If it is the defective coil spring W2 (YES in step ST7 in FIG. 6), the movable member 99 moves to the second position P2. Further, in step ST9, the defective coil spring W2 is carried into the collection box 100 as a reception unit for collection processing through the second transportation unit 97.

According to the coil spring manufacturing device 30 and the coil spring manufacturing method of this embodiment, the coil spring can be manufactured by the winding machine 40 regardless of whether there is a defect in the long continuous material 1C. Therefore, compared with the conventional case where the production line is stopped for defect correction every time a defect is detected, a coil spring can be manufactured efficiently. In particular, when a continuous material having a relatively large number of defects has to be used, it is effective in suppressing a decrease in the productivity of the coil spring.

As described above, the manufacturing method of the coil spring according to this embodiment includes the following procedures that are automated by the control unit 41. (1) Move the continuous material 1C placed on the material supply section 31 toward the flaw detection device 33, (2) Use the flaw detection device 33 to detect the presence or absence of the continuous material 1C (detection step), (3) If the continuous material 1C is detected In the case of a defect, the position of the defect is stored in a memory device (memory) 44 of the control unit 41. (4) Regardless of the presence or absence of the defect of the continuous material 1C passing through the flaw detection device 33, it is supplied to the winding machine 40 to form a coil spring. (5) Identify the non-defective coil spring formed from the non-defective part of the continuous material 1C and the defective coil spring formed from the non-defective part of the continuous material 1C. Comes to a different receiving section (receiving section for recycling etc.) for the non-defective coil spring.

Next, a second embodiment of the manufacturing process of the coil spring will be described with reference to FIGS. 9 and 10. FIG. 9 is a flowchart showing manufacturing steps of the coil spring. The coil spring manufacturing apparatus used in this manufacturing step is the same as the coil spring manufacturing apparatus 30 shown in FIGS. 3 to 5.

Steps ST1 to ST5 in FIG. 9 are the same as steps ST1 to ST5 in the manufacturing process of the first embodiment shown in FIG. 6. In step ST1 in FIG. 9, the continuous material 1C placed on the material supply section 31 (shown in FIG. 3) is supplied to the flaw detection device 33. In step ST2, it is checked whether there is a defect on the surface of the continuous material 1C. If a defect is detected (YES in step ST3), the process proceeds to step ST4. Next, the position of the defect (position information in the longitudinal direction of the continuous material 1C) is stored in the memory device 44 of the control unit 41, and the process proceeds to step ST5. In step ST5, the continuous material 1C is supplied to the winding machine 40. Step ST10 follows step ST5.

In step ST10 in FIG. 9, it is determined whether the continuous material 1C supplied to the winding machine 40 is defective. If it is determined that the continuous material 1C is free of defects (NO in step ST10), the process proceeds to step ST11. If it is determined that the continuous material 1C is defective (YES in step ST10), the process proceeds to step ST12.

In step ST11, the coil spring W1 of a normal shape is formed by the winding machine 40 using the defect-free continuous material 1C. Here, the coil spring W1 having a normal shape is a coil spring having a predetermined coil diameter, pitch, and coil length. An example of the coil spring W1 of a normal shape is shown in FIG. Since the operation of the winding machine 40 when the coil spring W1 is formed normally is the same as that of the first embodiment, the description is omitted.

In contrast, in step ST12, the winding machine 40 uses the defective continuous material 1C to form the shaped coil spring W3. Here, the special-shaped coil spring W3 is a coil spring whose shape is significantly different from that of a normal coil spring. As shown in FIG. 10, the shaped coil spring W3 is formed into a shape that can be distinguished from the normal coil spring W1 by visual inspection. For example, when the shaped coil spring W3 is formed, the position of the first pin 47 and the second pin 48 (shown in FIG. 4) is controlled by the control unit 41 so that the coil diameter D2 of the shaped coil spring W3 is larger than that of the normal coil spring W1. The diameter D1 is large. Alternatively, the control unit 41 controls the timing at which the cutting tool 51 cuts off the coil spring so that the number of turns of the special-shaped coil spring W3 is smaller than that of the normal coil spring W1.

When a defective part of a continuous material is wound, in some cases the continuous material may be broken because the stress is concentrated on the defect and the defect is the starting point. However, in the present embodiment, the coil having a larger diameter is formed at the defective portion of the continuous material to form the shaped coil spring W3. Therefore, the stress can be alleviated and concentrated on defects, and the danger of breakage of the continuous material during winding can be suppressed. When the defective part of the continuous material is wound, the number of turns can be reduced. Thereby, the length of the defective coil spring to be discarded is reduced, and the material wasted in the defective coil spring can be minimized.

The formed coil spring can be selected in step ST13 in FIG. 9 by, for example, visual inspection by an inspector. The normal coil spring (non-defective coil spring W1) is sent to the next step. Here, the next step is, for example, a stress relief annealing step, a standing step, a beading step, and the like. Alternatively, a robot (shown in FIG. 7) or a classification mechanism 95 (shown in FIG. 8) may be used to select the special-shaped coil spring W3 and the normal coil spring W1. The special-shaped coil spring W3 is sent to a receiving unit (recycling box, etc.) for disposal or recycling. [Industrial availability]

In the practice of the present invention, it is a matter of course that a material supply section of a continuous material such as a hoop material, or a flaw detection device, a winding machine, a control section, and a selection section may be placed, and the structure of the elements constituting the coil spring manufacturing device may be set as necessary Or configuration and other changes to implement. Furthermore, in addition to the memory built into the control unit, various external memories (external memory media) can also be used as the memory device for the location information of the memory defect.

1A, 1B, 1C‧‧‧Continuous

1D‧‧‧Circle

10‧‧‧ Equipment for extension processing

11‧‧‧Material Supply Department

12‧‧‧Mould Department

13‧‧‧ Take-up Department

20‧‧‧ Equipment for heat treatment

21‧‧‧Material Supply Department

22‧‧‧ Quenching Department

23‧‧‧Tempering Department

24‧‧‧ Take-up Department

30‧‧‧ Coil spring manufacturing device

31‧‧‧Material Supply Department

32‧‧‧straightening machine

33‧‧‧Flaw detection device

34‧‧‧Guide roller

40‧‧‧ Winding machine

41‧‧‧Control Department

44‧‧‧Memory device

45‧‧‧Material feed roller

46‧‧‧Material Guide

46a‧‧‧Front

47‧‧‧1st pin

48‧‧‧ 2nd pin

50‧‧‧ Pitch Tool

51‧‧‧ cutting tools

51a‧‧‧Blade

52‧‧‧ mandrel

52a‧‧‧Bottom Knife

60‧‧‧CPU

61‧‧‧Bus

62‧‧‧ROM

63‧‧‧RAM

64‧‧‧ Communication interface

65‧‧‧Display / operation driver

66‧‧‧Driver for material feed

67‧‧‧1st pin mobile driver

68‧‧‧ 2nd pin mobile driver

69‧‧‧ Pitch Tool Driver

70‧‧‧ Cutting driver

71‧‧‧Display operation section

81 ~ 84‧‧‧Actuator

85‧‧‧ personal computer

86‧‧‧ removable memory media

90,90A‧‧‧Selection

91‧‧‧Transportation Department

92‧‧‧ Robot

93‧‧‧arm

94‧‧‧ Fixture

95‧‧‧ Classification

96‧‧‧ the first transfer department

97‧‧‧The second transfer department

98‧‧‧Actuator

99‧‧‧ movable member

100‧‧‧Recycling bin

D1, D2‧‧‧‧Coil diameter

P1‧‧‧1st position

P2‧‧‧ 2nd position

W1, W2, W3‧‧‧ Coil Spring

FIG. 1 is a schematic plan view showing an example of an apparatus for drawing a continuous material.

Fig. 2 is a schematic plan view showing an example of an apparatus for heat-treating a continuous material.

Fig. 3 is a schematic plan view showing a coil spring manufacturing apparatus according to one embodiment.

FIG. 4 is a side view of a part of a winding machine of the coil spring manufacturing apparatus shown in FIG. 3. 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 a first embodiment of a manufacturing process of the coil spring.

FIG. 7 is a perspective view showing an example of a transfer unit.

FIG. 8 is a plan view showing an example of a selection section.

Fig. 9 is a flowchart showing a second embodiment of the manufacturing steps of the coil spring.

Fig. 10 is a front view showing two types of coil springs having different shapes.

Claims (9)

A coil spring manufacturing device, comprising: a material supply section for placing a continuous material as a material of the coil spring; a flaw detection device for detecting the presence or absence of a defect in the continuous material supplied from the material supply section; a memory device, When a defect is detected by the aforementioned flaw detection device, it is used to memorize the position information of the defect; the winding machine, regardless of whether the continuous material passing through the flaw detection device is defective, is wound to form a coil spring; and the selection section is based on The position information memorized in the aforementioned memory device is selected from a non-defective coil spring formed from the non-defective portion of the continuous material and a defective coil spring formed from the non-defective portion of the continuous material. The coil spring manufacturing apparatus according to claim 1, wherein the selecting section includes a robot for classifying the non-defective coil spring and the defective coil spring. For example, the coil spring manufacturing device according to claim 1, wherein the selecting unit has a classification mechanism for distinguishing the non-defective coil spring from the defective coil spring, and the classification mechanism moves the non-defective coil spring toward the first conveying unit, The said defective coil spring is moved toward a 2nd conveyance part. The coil spring manufacturing device according to claim 1, wherein the winding machine includes: a material feed roller to move the continuous material in a longitudinal direction; a material guide portion for inserting the continuous material; a first pin, and the material from the foregoing material The second continuous pin sent from the front end of the guide is in contact with the second pin. The second pin is disposed on the front side of the first continuous pin in the moving direction of the first pin, and the continuous pin is bent between the first pin and the first pin. An arc portion is formed between the first pin and the first pin; a pitch tool is disposed on the front side of the continuous material in the moving direction with respect to the second pin and is in contact with the continuous material; and a cutting tool is disposed on the second pin The continuous material is cut from the pitch tool and between it and the mandrel. For example, the coil spring manufacturing device of claim 4, wherein the winding machine controls the positions of the first pin and the second pin based on the position information memorized in the memory device, and winds the defective part of the continuous material The coil diameter at this time is larger than the coil diameter when the non-defective portion of the continuous material is wound. The coil spring manufacturing device according to claim 4 or 5, wherein the winding machine controls the cutting tool so that the number of turns when the defective portion of the continuous material is wound is greater than that when the non-defective portion of the continuous material is wound. The number of laps is still small. A method for manufacturing a coil spring, which comprises the following steps: detecting whether a continuous material supplied from a material supply unit is defective by using a flaw detection device; and when the defect is detected by the flaw detection device, storing position information of the defect in The memory device is supplied to the winding machine to form a coil spring regardless of whether the continuous material passing through the flaw detection device is defective or not. According to the position information stored in the memory device, the shape of the non-defective portion of the continuous material is selected. The non-defective coil spring and the non-defective coil spring formed from the defective portion of the continuous material are sent to a receiving unit different from the non-defective coil spring. According to the method for manufacturing a coil spring according to claim 7, the coil diameter when the defective portion of the continuous material is formed is larger than the coil diameter when the non-defective portion of the continuous material is formed. In the method for manufacturing a coil spring as claimed in claim 7 or 8, the number of turns when winding the defective portion of the continuous material is smaller than the number of turns when winding the non-defective portion of the continuous material.