KR101551178B1 - Apparatus for forming pig tail of coil spring - Google Patents

Abstract

The present invention relates to an apparatus for forming a pig tail of a coil spring. The present invention is to provide the apparatus for forming a pig tail of a coil spring, capable of forming a remaining pig tail on a heated coil spring, in which a pig tail is formed on one side thereof under a hot processing condition and supplied. The apparatus for forming a pig tail of a coil spring comprises: a lower jig on which a spring being hot processed is supplied and placed; side surface supporting jigs for individually supporting both surfaces of the spring by being elevated when a cylinder is operated; a rear surface fixing jig for supporting a rear surface side of the spring; a spring fixing jig unit consisting of a lower clamp, which grips a lower portion on the periphery at one point of a lower portion in a front surface portion of the spring on which the pig tail is formed, and an upper clamp, and fixedly supports the same, and an upper clamp, which grips upper and lower portions on the periphery at one point of the lower portion in the front surface portion of the spring, and supports the same by a rotary motion; and a cylindrical rotating jig unit which fixedly supports the front surface portion of the spring supplied to the spring fixing jig unit, and simultaneously grips an end of a spring, on which the pig tail is to be formed, and rotates the same.

Description

[0001] The present invention relates to a coil spring pigtail forming apparatus,

The present invention relates to a coil spring pigtail molding apparatus, and more particularly, to a device for molding a pigtail by grasping one side of a spring, which is in a hot working state after coil-shaped forming of a spring.

Spring is one of the most used parts in almost all industries, from automotive suspensions to ballpoint springs. These springs are classified into various types according to their use and materials. We will examine it in detail below.

First, the classification of the spring according to the materials used is classified as metal spring and non-metal spring.

Metal springs are classified as non-ferrous metal springs such as carbon steel springs, alloy steel springs, steel springs, copper alloy springs, and nickel alloy springs.

Non-metallic springs are classified into rubber springs, fluid springs (air springs, liquid springs), and synthetic springs (laminate springs).

The classification of springs according to applications is classified as compression springs, tension springs, torsion springs, release springs, leaf springs, and so on.

The compression spring is a typical spring of a coil spring. Compression springs can be manufactured by the user only with the spring diameter, outer diameter (inner diameter), free length and load. The method of use is a spring that operates by pressing force and adjusts the force according to the spacing according to the wire material and the number of windings, and its shape is classified into cylindrical shape, long rectangular shape, depar shape, and pupa shape.

The tension spring is a typical spring of a spring similar to the above-mentioned compression spring. It has a shape in which most of the coiled shape is closely adhered by using a tensile force instead of a compressive force. The material mainly uses a super tension plate.

The torsion spring is a spring that is operated by the force of torque, which is mainly used for suspensions, breakers, mobile phones, and televisions. It is possible to change the force depending on the spring wire, wire rod, angle, and number of springs. The stabilizer bar used in automobiles is also a kind of torsion spring.

The release spring is a spring which is formed by bending a steel wire, a hot wire or a stainless steel wire into various shapes.

The leaf spring is a spring used for a suspension device of a vehicle or the like and is a spring using a spring material for a spring.

Hereinafter, a method of manufacturing a coil spring in a spring will be described.

Generally, a method of manufacturing a coil spring is to match a wire diameter by fitting or filling a wire spring wire according to a thickness of a spring to be manufactured through a drawing process after melting a metal to manufacture a wire-shaped wire material. Thereafter, the drawn steel wire or the drawn steel wire is wound around the cylindrical machining member so as to have a specific wire diameter so as to have the shape of a spring. After that, if the coil is wound to have a uniform inner diameter of a certain size, it is cut to a certain length in accordance with the purpose of using the coil.

On the other hand, there is a time when the both ends of the springs, which are coiled with a certain inner diameter, are machined into smaller inner diameters again depending on the use destination to be mounted, and the shape having the smaller inner diameters at both ends of the spring is called a pig tail.

These pigtails were formed by forming pigtails at both ends under cold working after manufacturing the springs. Also, under hot working, pigtail was formed only at one side of the coil at the same time when the heated wire was wound to form a coil spring shape.

However, the pigtail formed under cold working is disadvantageous in that it has a lower mechanical property than the pigtail of the coil spring manufactured under the hot working, and therefore, a molding apparatus capable of forming pigtails at both ends of the spring under hot working However, such a device has not yet been provided.

Korean Patent Publication No. 10-2002-0019737 (Mar. 13, 2002) Korean Patent Publication No. 10-1999-0043795 (June 15, 1999) Korean Patent Publication No. 10-2011-0121724 (2011.11.08.) Korean Patent Registration Registration No. 10-0343771 (June 26, 2002)

In order to solve the above problems, an object of the present invention is to provide a coil spring pigtail molding device capable of forming a pigtail at one end of a coil spring, .

Another object of the present invention is to reduce the area of the gripping portion so that the molded portion has a uniform mechanical strength with the entire spring when the pigtail is further formed on one side of the spring by holding the spring under hot working, Which can be heated and maintained at a high temperature.

According to an aspect of the present invention, there is provided a lower jig to which a spring during a hot working is supplied, and a lower jig that rises during operation of the cylinder and supports both sides of the spring, A lower clamp which grips and fixes and holds the lower portion of the periphery of the lower portion of the lower portion of the front side of the front side of the spring for forming the pigtail, A spring fixing jig portion formed by an upper clamp to grip and support the spring fixing jig;

And a cylindrical rotating jig for fixing and supporting the front portion of the spring supplied to the spring fixing jig and grasping and rotating the end of the spring to be processed with the pigtail. .

In a preferred embodiment, the lower clamp and the upper clamp are constituted by a plurality of individual grippers spaced apart from each other by a predetermined distance, and the lower clamp heating means and the upper clamp heating means for heating the individual grippers, And further comprising means.

In a preferred embodiment, the lower clamp heating means has a first through hole passing through the inside of the lower clamp, a first electric resistance coil inserted into the first through hole, A first external power source for supplying the first external power may be provided to heat the grip portion.

In a preferred embodiment, the upper clamp heating means is provided with a second through hole passing through the inside of the upper clamp, and a second electric resistance coil is inserted into the second through hole, And a second external power source for supplying electricity may be provided to heat the grip portion.

In a preferred embodiment, the gripping portion can be configured to be heated to 400 to 500 DEG C by a heating means.

In a preferred embodiment, an insulator may be provided at a contact portion with the spring fixing jig provided with the lower clamp.

In a preferred embodiment, an insulator may be provided at the contact portion with the link provided with the upper clamp.

In a preferred embodiment, the rotation of the upper clamp comprises: a link supporting an upper clamp; A piston rod hinged to the link; The link pin projecting from the link moves along the guide groove formed in the frame of the spring fixing jig according to the operation of the piston rod so that the upper clamp coupled to the link is moved to the position where the pigtail processing is started And can be configured to be positioned on the upper side of the spring.

In a preferred embodiment, the cylindrical rotary jig has a front cylindrical jig that approaches the spring front portion and is inserted into the inner diameter of the spring to determine the inner diameter of the pigtail; And a cylindrical jig made of a rear cylindrical jig which is formed in a larger diameter at a rear end of the front-surface-side notifying member and is in contact with and supported by a point on the front side of the spring, A gripping clamp for fixing the end of the spring at the time of rotation for forming the pigtail after being in close contact with the front part can be constituted.

In a preferred embodiment, the gripping clamp is formed at the rear end of the gripping clamp so as to correspond to the gear-engaging portion when the rotary gear provided inside the cylindrical jig is rotated around the hinge by the movement of the motor provided at the lower side, And can be configured to move up and down.

The present invention has the advantage that the pigtail can be further formed at one side of the spring during hot working,

Also, it is possible to reduce the holding area of the gripping part holding the spring when forming the pigtail under the hot working, and to keep the heating area at a temperature higher than a certain temperature, thereby reducing the temperature change between the pigtail forming part and the existing spring forming part, It is a useful invention having an advantage that it can be produced industrially.

1 is a schematic view showing a pigtail molding apparatus according to an embodiment of the present invention,
FIG. 2 is a front view illustrating an internal cross-section of a part of a pigtail molding apparatus according to an embodiment of the present invention,
FIG. 3 is a front view illustrating an upper clamp and a lower clamp according to an embodiment of the present invention,
4 is a side view illustrating a state in which an upper clamp and a lower clamp grasp a spring according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a schematic view showing a pigtail molding apparatus according to an embodiment of the present invention, FIG. 2 is a front view showing a cross section of a principal part of a pigtail molding apparatus according to an embodiment of the present invention, 3 is a front view illustrating an upper clamp and a lower clamp according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of the upper clamp and the lower clamp according to an embodiment of the present invention. And Fig.

As shown in the figure, the pigtail forming apparatus according to the present invention includes a spring fixing jig 1 for fixing a spring 5 during hot working; And a cylindrical rotary jig part (2) for holding the end of the spring and rotating after forming the pigtail (51) on the spring (5). At this time, when the pigtail is formed at one end of the spring, the spring fixing jig part (1) rotates while the cylindrical rotary jig part (2) holds the spring and assists the pigtail molding, and at the same time, the spring fixing jig part And the whole is horizontally rotated at an angle to assist the pigtail molding.

The spring fixing jig (1) has lower jigs (11a, 11b) on which the supplied spring is placed; Side supporting jigs (12a, 12b) which are raised by a cylinder operation to respectively support both side surfaces of the spring; A rear fixing jig 13 which is inserted and supported on the rear side of the molded spring 51; The lower clamp 14 and the upper clamp 14, which are formed on the grip side, that is, the inner side is formed with a curvature corresponding to the shape of the outer diameter of the spring, so as to grasp and hold the spring around the front side of the spring, 15).

The lower jigs 11a and 11b are configured to be fixed to the frame so that the spring moved by the robot is brought into contact with the lower both side points so as not to move left and right. The shape is not limited to a rod-like or plate-like structure formed by a length, and the present invention is not limited to such a shape, but a structure capable of supporting the lower portion of the spring formed in the longitudinal direction is sufficient.

When the spring is fixed to the lower jig, the side jig (12a, 12b) is located on the outer side of the lower jig and is not in contact with the spring. And is fixedly supported. The lifting principle is that the piston rods 122a and 122b of the cylinders 121a and 121b connected to the side supporting jigs 12a and 12b and the lower side are protruded to the outside when the internal space of the cylinder is filled with pneumatic or hydraulic pressure, So that the center portions of both side surfaces of the spring are respectively supported.

The rear fixing jig 13 is configured to contact and support the pigtail on the rear side of the springs of the spring. The rear fixing jig 13 has a circular protruding structure in the center thereof smaller than the outermost inner diameter of the pigtail, And the plate member is integrally joined to the rear surface thereof to be held in contact with the rear surface of the pigtail.

 The lower clamp 14 has a structure in which a lower portion of the front surface of the lower clamp 14 is fixed by being contacted with a spring when the spring is heated by a clamp fixed to the spring fixing jig 1 to prevent it from being disengaged in the forward direction. And the side of the holding surface on which the spring is gripped and supported is formed so as to correspond to the shape of the outer diameter portion of the spring.

Further, the gripper 141 having the lower clamp 14 in contact with the spring is composed of a plurality of individual grippers 1411 spaced apart from each other at regular intervals. By having the structure separated by the individual grippers 1411 as described above, the contact area between the lower clamp and the spring is reduced, thereby reducing the local cooling phenomenon caused by the contact between the different metals with different temperature differences, so that the mechanical properties of the whole spring are uniformly maintained do.

In addition, the lower clamp 14 is provided with a lower clamp heating means for heating the temperature of the gripper 141 in a manner similar to the surface temperature of the spring during hot working. To this end, a first through hole 142 is formed in the lower clamp near the grip portion in a horizontal direction. A first electrical resistance coil 143 is inserted into the first through hole 142 And a first external power supply 144 for supplying electricity to the first electric resistance coil is provided. When the first external power source is turned on and off, the first electric resistance coil is operated to heat the grip portion to a desired temperature. The heating temperature is maintained at least 400 ° C, similar to the temperature of the spring during hot working. However, if the heating temperature is too high, the gripper can deform the surface of the spring under pressure. Therefore, the temperature is controlled so that the upper limit value does not exceed 500 ° C. In the temperature control, a temperature controller (not shown) controls the first external power source by a temperature sensor to control the temperature.

Further, an insulator 145 is provided at the contact portion with the spring fixing jig 1 provided with the lower clamp 14 so as to insulate it safely.

The upper clamp 15 is rotated and positioned toward the upper side of the lower clamp 14 so as to press and hold the spring. When the cylindrical jig 21 approaches and contacts the front portion of the spring, the upper clamp 15 operates. And the side of the holding surface on which the spring is gripped and supported is formed so as to correspond to the shape of the outer diameter portion of the spring.

A link 151 supporting the upper clamp 15 for operation of the upper clamp, a piston rod 153 coupling the link and the hinge 152, and a cylinder 154 actuating the piston rod. The protruding link pin 1511 is formed on the link so that the upper clamp coupled to the link moves along the guide groove 16 formed in the frame of the spring fixing jig 1 according to the operation of the piston rod, It is located on the upper side of the spring 5 at the point where it is to be started so that the spring is pressed and held or separated from the spring. That is, the shape of the guide groove has a groove structure in which the lower section is inclined toward the rear side of the spring, and the upper side has a groove structure horizontally processed in the direction of the rear side of the spring. When the piston rod is lifted, the link rises along the guide groove When the guide groove point formed in the horizontal direction is reached, the upper side is clogged and the upward force is restricted, so that the moving direction is bent toward the rear direction of the spring. When the moving direction is changed as described above, the position of the upper clamp is tilted to the right, and the lower clamp is tilted toward the upper side of the fixed holding spring. When the piston rod continuously protrudes from the cylinder, the gripping force of the upper clamp holding the spring is increased, and the spring is strongly pressed.

The grip portion 155, which the upper clamp 15 contacts with the spring, is composed of a plurality of individual grippers 1551 spaced apart at regular intervals. By having the structure separated by the individual grippers 1551, the contact area between the upper clamp and the spring is reduced, thereby reducing the local cooling phenomenon caused by the contact between the different metals with different temperature differences, thereby maintaining the mechanical properties of the entire spring uniform do.

The upper clamp 15 is provided with upper clamp heating means for heating the temperature of the grip portion 155 in a manner similar to the surface temperature of the spring during hot working. For this purpose, a second through hole 156 is formed in the upper clamp near the grip portion in a horizontal direction. A second electric resistance coil 157 is inserted into the second through hole 156 And a second external power source 158 is provided for supplying electricity to the second electric resistance coil. And the second electric resistance coil is operated according to the on / off of the second external power source to heat the grip portion to a desired temperature. The heating temperature is maintained at least 400 ° C, similar to the temperature of the spring during hot working. However, if the heating temperature is too high, the grasping part under pressure grasps the surface of the spring, so the temperature is controlled so that the upper limit does not exceed 500 ° C. In the temperature control, a temperature controller (not shown) controls the second external power source by a temperature sensor to control the temperature.

An insulator 159 is provided at the contact portion with the link 151 provided with the upper clamp 15 so as to insulate the insulator 159 safely.

And a cylindrical rotary jig 2 corresponding to the inner diameter of the pigtail is approached and supported on the front portion of the pigtail 51 to be molded.

The cylindrical rotary jig 2 has a front cylindrical jig 211 that approaches the front surface of the spring 5 and is inserted into the inner diameter of the spring to determine the inner diameter of the pigtail, And a cylindrical jig (21) formed of a diameter and a rear cylindrical jig (212) supported in contact with one point of a front portion of the spring. The circular jig (21) is axially combined with a rotary drive source .

Further, a gripping clamp 22 is provided at a circumferential point of the back side cylindrical jig 212 of the original notifier to fix the end of the spring when the spigot is rotated for tight fitting with the front portion. The gripping clamp is formed at the rear end of the gripping clamp 22 in correspondence with the rotation of the hinge 25 by the movement of the motor 24 provided with the rotary gear 23 provided inside the cylindrical jig, And the end of the spring is held by the reciprocating movement of the gripping clamp that ascends and descends through the hole for raising and lowering the gripping clamp formed at the peripheral position of the rear cylindrical jig 212. [ The principle of rectilinear motion is to form a circumscribed gear in which the gear of the rotary gear is formed in the convex portion, and the gear teeth are engaged with the gear in correspondence with the gear, so that the gripping clamp performs a linear motion in the gear engagement section.

Accordingly, when the gripping clamp is lowered, the spring to which the pigtail is to be formed is gripped, and when the gripping clamp is raised, it becomes non-detachable. Also, as the position of the gripping clamp which is lowered and held by the spring is rotated, the spring rotates to form the pigtail.

The operation of the present invention having the configuration of the present invention configured as described above will be described below. The pigtail forming apparatus according to the present invention may be configured such that power is applied to the first electric resistance coil 143 and the second electric resistance coil 157 in advance before the lower clamp 14 and the upper clamp 15 are operated, Preheat to the section. In this preheated state, the heated spring is supplied and the pigtail is molded on one side.

The robot is gripped by the heated jig (11a, 11b) constituting the spring fixing jig (1) of the pigtail molding apparatus of the present invention, and the heated jig (11a, 11b) At this time, the front and bottom of the spring circumference at the starting point where the pigtail molding is performed, which is the lower part of the front side of the spring, is held in contact with the lower clamp 14.

The side supporting jigs 12a and 12b supporting the both sides of the spring are supported by the cylinders 121a and 121b so as to prevent the spring from moving. At the same time, the rear fixing jig 13 And a part of the spring is inserted into and supported by the inside of the spring.

When the rear side, the left and right side surfaces and the front lower side of the spring are supported, the cylindrical rotary jig 2 approaches and supports the front portion of the spring, and then the upper clamp 15 presses and holds the upper portion of the spring corresponding to the lower clamp. Is moved by the operation of the cylinder 154 to strongly grip in the downward direction from the upper side. When the grasping of the upper clamp 15 is completed in this way, the upper and lower clamps prevent the spring from moving

At this time, the lower clamp 14 and the upper clamp 15 are maintained at a temperature of 400 to 500 DEG C, and the grippers 1411 and 1551 formed on the grip portions 141 and 154 of the lower and upper clamps, respectively, So that the temperature of the spring surface held by the lower clamp 14 and the upper clamp 15 is less varied, so that it has uniform mechanical properties with neighboring spring portions.

When the upper clamp is gripped as described above, the gripping clamp 22 of the cylindrical rotary jig 2 grips the tip of the spring and then rotates at a predetermined angle. When the cylindrical rotary jig 2 rotates as described above, the shape of the spring is formed into a pigtail from the point where the upper clamp and the lower clamp are pressed. At this time, the inner diameter of the pigtail corresponds to the outer diameter of the front cylindrical jig 211 of the cylindrical jig 21 constituting the cylindrical rotary jig. On the other hand, when the cylindrical rotary jig part is rotated, the spring fixing jig part 1 also horizontally rotates at a predetermined angle to assist the pigtail molding of the cylindrical rotary jig, so that the pitch of the pigtail is slightly increased.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(1): spring fixing jig (2): cylindrical rotating jig
(5): Springs (11a, 11b): Lower jig
(12a, 12b): side supporting jig (13): rear side fixing jig
(14): Lower clamp (15): Upper clamp
(16): guide groove (21): cylindrical jig
(22): a gripping clamp (23): a rotary gear
(24): motor (25): hinge
(51): pigtail (121a, 121b): cylinder
(122a, 122b): piston rod (141): grip section
(142): first through hole (143): first electric resistance coil
(144): first external power supply (145): insulator
(151): Link (152): Hinge
(153): piston rod (154): cylinder
(155): grip portion (156): second through hole
(157): second electric resistance coil (158): second external power source
(159): Insulator (211): Front cylindrical jig
(212): rear cylindrical jig (221)
(1411): Gripper (1511): Link pin
(1551): Gripper

Claims (10)

A lower jig to which a spring during hot working is supplied, a side supporting jig which rises during operation of the cylinder to support both side surfaces of the spring, a rear fixing jig for supporting the rear side of the spring, A lower clamp for gripping and fixing the lower periphery of the lower portion and a lower clamp for holding and supporting the upper and lower portions of the periphery of the lower portion of the front portion of the spring by a rotation operation;
And a cylindrical rotating jig for holding the front portion of the spring supplied to the spring fixing jig and holding the end of the spring to be processed with the pigtail,
The lower clamp and the upper clamp may further include a lower clamp heating unit and an upper clamp heating unit that are configured by a plurality of individual grippers spaced apart from each other by a predetermined distance, And the coil spring pigtail forming device is configured to form the coil spring pigtail.
delete The method according to claim 1,
Wherein the lower clamp heating means has a first through hole passing through the inside of the lower clamp, a first electric resistance coil inserted into the first through hole, and a second electric resistance coil for supplying electricity to the first electric resistance coil 1 external power source is installed to heat the grip portion.
The method according to claim 1,
Wherein the upper clamp heating means is provided with a second through hole passing through the inside of the upper clamp, a second electric resistance coil inserted into the second through hole, and a second electric resistance coil for supplying electricity to the second electric resistance coil And the second external power source is installed to heat the gripping portion.
The method according to claim 3 or 4,
Wherein the gripping portion is heated by the heating means to 400 to 500 占 폚.
The method of claim 3,
And an insulator is provided at a contact portion of the spring clamping jig with the lower clamp installed thereon.
The method of claim 4,
Wherein an insulator is provided at a contact portion with the link provided with the upper clamp.
The method according to claim 1,
The rotation of the upper clamp includes: a link for supporting an upper clamp; A piston rod hinged to the link; The link pin projecting from the link moves along the guide groove formed in the frame of the spring fixing jig according to the operation of the piston rod so that the upper clamp coupled to the link is moved to the position where the pigtail processing is started Wherein the coil spigot is formed on the upper side of the spring.
The method according to claim 1,
Wherein the cylindrical rotary jig has a front cylindrical jig that approaches the spring front portion and is inserted into the inner diameter of the spring to determine the inner diameter of the pigtail; A cylindrical jig having a larger diameter at the rear end of the front cylindrical jig 211 and made of a rear cylindrical jig which is in contact with and supported at one point of the front surface of the spring, And a gripping clamp for fixing the end of the spring to the pigtail after being brought into close contact with the front part.
The method of claim 9,
When the rotary gear installed inside the cylindrical jig is rotated about the hinge by the movement of the motor provided at the lower side, the gripping clamp is formed at the rear end of the gripping clamp so as to move up and down by linear motion of the gear- Wherein the coil spring pigtail forming device is configured to form a coil spring pigtail.

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