JPS63123535A - Coiling machine - Google Patents

Abstract

PURPOSE:To form coil springs of many kinds according to a spring pitch and wire diameter by one unit of the title machine by controlling a spiral guide forming die by rotating it at the specified pitch for the rotary core metal winding the wire rod for spring and adjusting the guide width according to the wire diameter. CONSTITUTION:A core metal 11 is driven by engaging it with pressure with the core metal driving head 14 which is rotated by a core metal driving mechanism 13, a chuck 17 is actuated 18 and a wire rod A is wound with its holding, and by the pulse 42 rotary control of a hydraulic servomotor 41 by the control device 45 of a forming die 12 the wire rod A is formed in the specified pitch and wound. For the stationary side guide 53 of the forming die 12 the mobile side adjusts the position of a guide 65 by the movement of a pin 63 with a guide gap adjusting mechanism 68 and the guide width is made an optimum width corresponding to the wire diameter. With said correction and control the coil springs of multidiameter and multikind are manufactured with good efficiency without change of the forming die 12 by one unit of a coiling machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coiling machine used for manufacturing coil springs.

[Conventional technology]

BACKGROUND ART Coiling machines are used to hot-form coil springs used in automobile suspension springs, and machines using lead screws are known. As shown in FIG. 4, this type of coiling machine is provided with a lead screw 2 at a position facing away from the core metal 1, and the lead screw 2 is provided with a pitch of the coil spring to be formed. A spiral groove 3 corresponding to the groove 3 is formed.

These core bar 1 and lead screw 2 are rotated at the same circumferential speed. Then, with the end of the material A of the coil spring fixed by the chuck 4, the material A is supplied while rotating the core metal 1 and the lead screw 2, so that the material A is supplied at a predetermined pitch along the spiral groove 3. is wound around the core metal 1.

[Problem that the invention seeks to solve]

However, in the case of the above-mentioned conventional apparatus, it is necessary to prepare many types of lead screws 2 depending on the pitch and material diameter of the coil spring to be formed, and the manufacturing, handling, and storage of the lead screws 2 is complicated.

There are many problems in terms of running costs, etc. Also, if the pitch or material diameter of the coil spring is changed, the lead screw 2 may need to be remade.
Not only was it extremely uneconomical, but it also took a considerable amount of time to respond.

[Means for solving problems]

The present invention provides a core metal for winding a coil spring material;
A core metal drive mechanism that rotationally drives the core metal, a mold provided parallel to the core metal at a position spaced apart from and opposite to the core metal, and a mold drive mechanism that rotationally drives the mold. Applicable to coiling machines.

In the present invention, the outer periphery of the mold includes a spiral fixed guide and a movable guide arranged spirally at the same pitch as the fixed guide and movable in the axial direction of the mold. establish. Furthermore, the mold is provided with a guide interval adjustment mechanism for variably setting the relative axial position of the movable guide with respect to the fixed guide. Further, the coiling machine is characterized in that the mold drive mechanism is provided with a servo motor that rotates the mold at a speed related to the rotation angle of the core metal according to the pitch of the coil spring to be molded. .

[Effect]

The movable guide of the mold can adjust the axial position of the mold by a guide interval adjustment mechanism.

That is, the width of the groove between the movable guide and the fixed guide is adjusted depending on the material diameter of the coil spring.

After the end of the material is chucked to the core metal, the core metal is rotated by the core metal drive mechanism, so that the material of the coil spring is wound around the core metal. Immediately before the material is wound around the core metal, its axial position relative to the core metal is guided by the fixed side guide and the movable side guide of the mold. This mold is rotated by a servo motor of a mold drive mechanism at a speed that corresponds to the pitch of the coil spring to be molded in relation to the rotation angle of the core metal. For example, if you stop the servo motor and stop rotating the mold, the material will be wound up with a pitch of O, and if you rotate the mold at high speed, the moving speed of the fixed guide and movable guide will increase. It is wound at a large pitch.

〔Example〕

The coiling machine 10 shown in FIG. 1 includes a core metal 11 and a mold 12. The cross section of the core metal 11 is circular, and the outer diameter is equal over almost the entire length in the length direction. A core drive head 14, which constitutes a part of the core drive mechanism 13, is connected to one end of the core 11 so as to be removable. The other end side of the core metal 11 is rotatably supported by a bearing 15, and the core metal 11 and the bearing 15
and are fixed to each other in the axial direction by appropriate means such as an air cylinder.

The core drive head 14 is provided with a chuck 17 for gripping the end of the material A. This chuck 17 can be opened and closed in the radial direction of the core metal 11 by a chuck driving means 18 using a rotating air cylinder or the like.

The core drive head 14 is connected to the output shaft side of the speed reducer 20. A pneumatic or electromagnetic brake 21 and clutch 22 are attached to the input shaft side of the reduction gear 11120.

The rotational force of an electric motor 28 is transmitted to the clutch 22 via pulleys 24 and 25 and a belt 26. motor 2
8 and the reducer 20 are fixed to the main body base 30. The speed reducer 20 is provided with a pulse generator 31 for detecting the rotation angle of the core metal 11.

The bearing 15 is fixed to the slider 33. The slider 33 is capable of reciprocating along the guide rail 34 in the axial direction of the core metal 11.

A rod portion 37 of a driving means 36 using a reciprocating air cylinder or the like is connected to the slider 33, and when the rod portion 37 expands and contracts, the bearing 15 moves in the length direction of the guide rail 34 together with the core metal 11. It looks like this.

Further, a frame body 38 is fixed to the main body base 3o. The mold 12 is supported by the frame 38 so as to be rotatable around an axis. As shown in FIGS. 1 and 3, the mold 12 is provided parallel to the core metal 11 at a position spaced apart from the core metal 11, and the rotational force of the hydraulic servo motor 41 is transmitted through the gear unit 4o. is transmitted. This servo motor 41 is provided with a pulse generator 42 that generates pulses related to the rotation angle of the mold 12. The servo motor 41, gear unit 40, pulse generator 42, and the like constitute a mold drive mechanism 43.

The pulse generators 31 and 42 are connected to a control device 45, such as a microcomputer, which has data input and processing/arithmetic functions. This control device 45 controls the motor 28, the brake 21. Clutch 22. Drive means 18.3
It is designed to send signals to 6th grade as well.

The structure of mold 12 is shown in FIG. Molding mold 12
The mold main body 47 has a cylindrical shape and a hollow columnar end member 48 is provided at both ends thereof. The terminal member 48 is supported by the frame body 38 via a radial bearing 50,
A flange portion 51 is provided on the end surface side.

A spiral fixed guide 53 is provided on the outer periphery of the mold body 47.
is provided. The pitch Pr of the fixed side guide 53 is
It is substantially equal over almost the entire length of the mold 12.

A shaft 55 is inserted into the mold body 47 .

A key 56 is provided at the end of this shaft 55. The key 56 is slidably fitted into an axial key groove 57 formed on the inner surface of the terminal member 48. Therefore, the shaft 55 is movable in the axial direction with respect to the mold body 47, but cannot rotate relative to the mold body 47 in the circumferential direction. A male threaded portion 58 is provided at one end of the shaft 55 . Further, the tip 55a of the shaft is formed into a so-called square head shape so that it can be grasped with a tool such as a spanner.

The male threaded portion 58 has a female threaded member 60 and a lock nut 61.
are screwed together. The female threaded member 60 is attached by a thrust-type bearing 62 so as to be rotatable relative to the flange 51 but immovable in the axial direction. Therefore, the female screw member 60 can rotate relative to the mold body 47, but cannot move in the axial direction. The female threaded member 60 is fixed at a desired rotational position by tightening the lock nut 61. Furthermore, large diameter portions 55b are provided at multiple locations in the intermediate portion of the shaft 55 in the length direction. A bottle 63 is provided in the large diameter portion 55b so as to protrude in the radial direction of the shaft 55.

The movable side guides 6 are arranged at an equal pitch on the outer periphery of the mold body 47.
5 is provided. The movable guide 65 is spirally formed with the same pitch as the fixed guide 53 described above, and the movable guide 65 is movable in the axial direction of the mold 12. The protrusion heights H of the fixed guide 53 and the movable guide 65 are equal to each other. A plurality of through holes 66 are formed at appropriate intervals in the base 65a of the movable guide 65, and the bottles 63 are inserted into the through holes 66. Since the bin 63 is provided on the shaft 55, when the shaft 55 moves in the axial direction, the movable guide 65 also moves in the same direction. That is, the shaft 55, the pin 63-degree female screw member 60, and the like constitute a guide interval adjustment mechanism 68.

The coiling machine 10 configured as described above adjusts the distance between the fixed guide 53 and the movable guide 65 in accordance with the outer diameter of the material A of the coil spring. i.e. locknut 6
1 is loosened and the tip 55a of the shaft 55 is fixed with a tool such as a spanner, and the female threaded member 60 is rotated. As the female threaded member 60 rotates, the shaft 55 will spiral forward or backward in the axial direction. When the shaft 55 moves in the axial direction, the movable guide 65 also moves in the axial direction via the pin 63. After adjusting the distance between the guides 53 and 65 in this manner, the lock nut 61 is tightened.

After the above setup is completed, hot coiling is performed. That is, the round rod-shaped material A is heated to, for example, around 1000° C. by a heating device (not shown), and then the tip thereof is inserted between the chuck 17 and the metal core 11. When a start signal is given by the control device 45, the chuck driving means 18 is operated to lower the chuck 17, and the tip of the material A is fixed to the end of the core metal 11. Next, the brake 21 is released and the clutch 22 is connected. The electric motor 28 is rotated by pulleys 24, 25 and belt 26. Clutch 22. The signal is transmitted to the core metal 11 via the speed reducer 2o and the core metal drive head 14. When the core metal drive head 14 rotates and the core metal 11 rotates, the material is wound onto its outer peripheral surface.

As shown by the arrow in FIG. 3, the core metal 11 and the mold 1
The material A is rotated in opposite directions to the core metal 11.
Immediately before the core metal 11 is wound, the guides 53 and 65 of the mold 12 guide the axial position with respect to the core metal 11. More specifically, the pulse generator 31 constantly detects the rotation angle of the core metal 11, and the data is sequentially input to the control device 45. Data regarding the pitch according to the type of coil spring to be formed is input into the control device 45 in advance via a keyboard or a recording medium such as a floppy disk. Based on this data, the rotational speed of the hydraulic servo motor 410, that is, the rotational circumferential speed of the mold 12, is controlled according to a processing procedure programmed in advance in the control device 45.

That is, if the servo motor 41 stops, the material A will no longer be fed in the axial direction of the core metal 11, so it will be wound up with a pitch of zero. Furthermore, if the servo motor 41 rotates at high speed, the moving speed of the guides 53 and 65 will also increase, and the material
is fed at a high speed in the axial direction of the core metal 11, so the pitch is large.

In this way, the servo motor 41
By controlling the rotation speed of the coil spring, coil springs with various pitches can be formed. As above, material A
The position is guided by the guide 5'3.65 just before it wraps around the core metal 11, but since the part where it wraps around the core metal 11 separates from the guides 53 and 65, it is not constrained by the pitch of the guides 53 and 65. . The end of the material remote from the guides 53,65 is wound onto the core 11 using a termination roll (not shown) fixed to the body base 30 in close proximity to the core 11.

When a predetermined length has been wound, the clutch 22 is disengaged and the brake 21 is operated, so that the core metal 11
rotation stops. Subsequently, the chuck driving means 18 is operated to move the chuck 17 away from the tip of the material A. Then, the driving means 36 operates, and the rond part 37 moves all at once in the right direction in the figure. Along with this, the core metal 11 moves in the same direction, so that the formed coil spring A'
Extracted from 1.

According to the coiling machine 10 having the above configuration, the axial position of the movable guide 65 can be adjusted according to the outer diameter of the material A, and changes in the material diameter can be easily coped with. In addition, core metal 1
By numerically controlling the rotation speed of the mold 12 in relation to one rotation angle, coil springs with various pitches can be easily molded. In addition, when the specifications (pitch) of the coil spring to be formed are changed, or when the characteristics of the formed coil spring are not as designed, it can be easily corrected by replacing the data input to the control device 45. is possible.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to respond to changes in the pitch and material diameter of the coil spring while using the same mold, eliminating the need to replace or remanufacturing the mold, and using a single coiling machine. A wide variety of coil springs can be formed using this method.

[Brief explanation of the drawing]

FIG. 1 is a side view of a coiling machine showing an embodiment of the present invention, FIG. 2 is a sectional view showing a part of the mold in FIG. 1,
FIG. 3 is a schematic side view showing the relationship between the core metal and the mold in FIG. 1. FIG. 4 is a side view showing a part of a conventional coiling machine. A... Coil spring material, 10... Coiling machine, 11... Core metal, 12... Molding mold, 13... Core metal drive mechanism, 41... Servo motor, 43... Molding die drive mechanism, 45...control device, 53...fixed side guide, 65...movable side guide, 68...guide interval adjustment mechanism. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4

Claims (1)

[Scope of Claims] A core metal for winding material of a coil spring, a core drive mechanism for rotationally driving the core metal, and a core metal drive mechanism provided parallel to the core metal at a position spaced apart from and facing the core metal. In a coiling machine equipped with a mold and a mold drive mechanism that rotationally drives the mold, a spiral fixed guide is provided on the outer periphery of the mold, and the coiling machine is arranged at a pitch equal to that of the fixed guide. A movable guide is provided on the outer periphery of the mold and is movable in the axial direction of the mold, and the mold is further provided with a movable guide whose axial relative position with respect to the fixed guide is adjustable. A guide interval adjustment mechanism is provided, and the mold drive mechanism is provided with a servo motor that rotates the mold at a speed related to the rotation angle of the core metal according to the pitch of the coil spring to be molded. Features a coiling machine.