JPH0751782A - Prodction of coil spring - Google Patents

Abstract

PURPOSE:To produce a stably seatable compression coil spring by cutting off a preceding coil spring from a succeeding coil spring put in adjacent to each other at a winding end working part at the taper tail of the former and the taper head of the latter to be separated. CONSTITUTION:A wire rod for spring 2 is selected so as to provide the diameter phi2 of a compression coil spring to be formed. The end working part 3 is constituted at a pitch of length L2 of the wire rod 2 which is required to produce one compression coil spring. Gently tapered parts 4 having length L3 of about twice to thrice the diameter of coil are formed on both sides of the end working part 3. The wire rod 2 is supplied to a supply passage while holding the face of tapered part 4 of winding end working part 3 in the direction orthogonally crossing the moving direction of a pitch control block of a spring winding machine. The preceding coil spring and succeeding coil spring are cut to be separated at the tail of the part 4 of the former and the head of the part 4 of the latter by operating a cutter. Thus, production cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil ridge manufacturing technique and, more particularly, to a method for manufacturing a coil ridge capable of eliminating the post-grinding post-treatment process for setting a free length of a compression coil ridge. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5 (a), a compression coil strip 50 manufactured by a strip winding machine has a winding end 52 (a winding start end and a winding end end) of a wire 51 which is spirally wound. But,
The wire rod 51 is cut at a substantially right angle by the cutter of the wire winding machine. For this reason, not only the free length L1 of the compression coil spring 50 cannot be obtained accurately, but also the end surface of the coil spring becomes inclined with respect to the central axis CL, and "sitting (a sense of stability in contact surface)" is poor. is there.

Therefore, conventionally, both winding end surfaces of the compression coil winding 50 which has been wound by the above-mentioned winding winding machine are subjected to a grinder so that the winding end surfaces are orthogonal to the central axis CL (FIG. 5 (b)).
See)) and post-treatment is carried out.

[0004]

However, in the post-treatment step by the above-mentioned grinding machine, since the raw material is hard, the processing time becomes long and the production efficiency is poor. There is also a problem in the working environment at the manufacturing site, such as the scattering of dust and the generation of grinding noise.

The present invention has been made in view of the above problems, and a novel coil strip which can efficiently manufacture a compressed coil strip without post-processing by a grinder and improve the working environment is provided. It is intended to propose a manufacturing method.

[0006]

A method for manufacturing a coil winding according to the present invention is directed to a winding block, in which a winding block is opposed to a leading end of a supply path of a winding wire, and a winding is performed by a pitch control block which advances and retracts in a winding central axis direction. The wound wire rod is guided in the direction of the winding central axis to screw the wire rod to a predetermined coil outer diameter and pitch, and at a predetermined total number of turns by a cutter protruding toward the winding central axis. This is carried out in winding production of a compression coil strip by a strip winding machine formed by cutting the rear end.

[0007] For a continuous wire rod for supplying to the winding portion through the above-mentioned supply path, one taper is provided from both sides of the wire rod for forming a compression coil to be manufactured at the length pitch of the wire rod. A symmetrical winding end processing portion having a loose taper shape whose length is approximately 2 to 3 times the outer diameter of the coil is formed in advance, and the taper surface of the winding end processing portion is pitch control of the above-described winding winding machine. Hold the wire in the direction orthogonal to the moving direction of the block and supply the wire rod for wire supply to the supply path, and at the taper end position of the compression coil wire before and the taper start end position of the compression coil wire after that, which are adjacent to each other at the winding end processing part The gist is to operate and cut the cutter.

Further, the outer diameter control position of the coil to be manufactured is adjusted in accordance with the timing when one taper end and one taper start position of the winding end processing portion of the above-mentioned wire rod for wire passing pass the winding block position of the wire winding machine. The gist is to control the forward / backward displacement of the winding block so as to meet the condition and the control position condition associated with the deformation of the wire rod for drawing.

[0009]

In the above-described method for manufacturing the coiled strip, since the striped wire material for forming the coiled strip is previously subjected to a shape treatment corresponding to the grinding shape formed by the conventional winding end grinding treatment, the winding end processing is performed. It is possible to obtain a well-compressed compression coil strip whose winding end surface is substantially orthogonal to the central axis of the coil strip by simply supplying the strip winding machine while controlling the direction of the portion. Further, since both ends of the coil spring are orthogonal to the center axis, the free length of the coil spring can be accurately manufactured by designing the pitch of the tapered winding end processed portion formed on the wire rod for spring in advance. be able to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a coil strip according to the present invention will be described below with reference to FIGS. The present invention is shown in FIG.
As shown in (a) and (b), a compression coil strip 1 having a free length L1, a coil outer diameter φ1, a wire diameter φ of a strip material, a total number of turns n, a screw pitch P, and a terminal thickness t is manufactured. It is a thing.

FIG. 2 (a) is a front view of a raw material 2 for a wire rod for use in the present invention. That is, the wire rod 2 for stretch is
It is selected under the condition that the wire diameter φ2 of the compression coil spring 1 to be manufactured is satisfied. The compression wire 1 is attached to the wire 2 for the wire.
The length L2 (= √) of the wire rod 2 for barring required for individual production
The terminal processing portion 3 is configured with a pitch of {(πφ1) ² + (nP) ² )}, and the terminal processing portion 3 is configured with a fixed orientation.

The terminal processing section 3 is shown in FIGS. 2 (b) and 2 (c).
As shown in, the length L3 of one taper portion 4 is symmetrical from both sides of the wire rod 2 for forming a wire having a loose taper shape of approximately 2 to 3 times the coil outer diameter φ1. Four
Another taper portion 4 start end position (arrow A) that is adjacent to the end end is configured to correspond to the terminal thickness t. The processing of the terminal processing portion 3 can be performed by pressing or grinding.

A wire rod 2 for forming a wire having the terminal-processed portion 3 formed thereon.
Is wound in a spiral shape by a conventional winding winding machine 10 as shown in the schematic views of FIGS. 3 and 4. Wire winding machine 10
Is provided with supply rollers 11, 11 ... Rotated and driven by a supply motor in a supply path (arrow B) of the wire rod for drawing, and the wire rod 2 for drawing is wound on a winding portion (arrow C) where the cutter lower blade 12 is located. Transfer in a state of being sandwiched without slipping. (If slippage occurs, it becomes impossible to control the supply length of the wire rod 2 for a constant amount.) At this time, the surface of the taper portion 4 of the terminal processing part 3 is wound in the direction of supply of the wire rod 2 for a wire. Part (arrow C)
It is held so as to be orthogonal to the winding central axis CL.

A winding block 14 is provided at the position of the lower cutter blade 12 so as to face the supply path so as to move back and forth (arrow D), and a coil having a cam structure is provided via a hydraulic cylinder 15. It is fixed to the outer diameter adjusting mechanism 16. The hydraulic cylinder 15 is controlled to move in and out by a control output of a central control circuit 18 via a hydraulic control device 17, and the move-out control signal is the winding block 1 described above.
4 is output by a position detection input from a sensor 19 configured to detect the end processing portion 3 of the wire rod 2 for rolling provided at the sliding contact end position of 4, and the winding block 14 is operated.

Reference numeral 20 is supplied to the winding portion (arrow C), and the wire rod 2 for bending which is abutted against the winding block 14 and bent at a predetermined bending rate, and in the winding central axis CL direction. The pitch control block 20 is in sliding contact with the pitch control block 20. The pitch control block 20 is provided so as to be movable back and forth (arrow E) in the winding central axis direction, and is provided by a pitch adjusting mechanism 21 having a cam structure connected to the rear end. The filament wire 2 is operated so as to have a predetermined pitch. (It should be noted that the pitch control block 20 is drive-controlled so that the winding end of the winding wire rod 2 abuts an adjacent wire rod at the beginning and end of the winding end portion.

The reference numeral 13 indicates the next compression coil strip which is adjacent to the end of the tapered portion 4 of the compression coil strip 1 in front of the strip wire 2 passing through the cutter lower blade 12 and passing through this portion. 1 is a cutter upper blade that cuts the starting end position (arrow A) of the tapered portion 4 of No. 1, and the cutter blade driving mechanism 22 advances the cutter upper blade 13 at a predetermined timing to cut and separate the previous compression coil spring 1. .

The compression coil strip 1 shown in FIGS. 1 (a) and 1 (b) can be formed by the above manufacturing method, and the coil strips are formed by the structure of the taper portions 4, 4 ... Is formed so as to be substantially orthogonal to the central axis CL, and the free length L1 is within a predetermined dimension.

Incidentally, according to the method for manufacturing a coiled wire according to the present invention, the embodiment in which the wire-wound wire 2 in which the winding end processed portion 3 is formed at a predetermined interval L2 is used has been described. The winding end processing unit 3 can also perform processing just before the supply to the supply path (arrow B) of the roll winding machine 10.

[0019]

As described above, according to the method for manufacturing a coil strip according to the present invention, the coil wire forming the coil strip has a shape corresponding to the deformed shape previously formed by the conventional winding end grinding process. Since it has been processed, it is possible to manufacture a well-compressed compression coil spring whose winding end face is substantially orthogonal to the center axis of the coil spring simply by supplying it to the coil winding machine while maintaining the orientation of the winding end processed portion. The production cost can be reduced.

Further, since both ends of the coil strip are orthogonal to the central axis, the coil strip can be formed by using a material in which the pitch of the tapered winding end portion to be formed on the strip wire is designed and processed in advance. It has a feature that the free length of can be accurately manufactured, and the effect obtained by implementing the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view (a) and end view (b) of a compression coil strip manufactured by a method for manufacturing a coil strip according to the present invention.

FIG. 2 is a front view (a) and an enlarged view (b) of a main portion of a wire rod for a wire used in a method for manufacturing a coil wire according to the present invention.
It is also the side view (c).

FIG. 3 is a schematic front view of a wire winding machine for winding a wire rod according to the present invention in a spiral shape.

FIG. 4 is a schematic plan view of the same.

FIG. 5 is a front sectional view (a) of a first step and a front sectional view (b) of a second step of a compression coil strip showing a method for manufacturing a conventional coil strip.

[Explanation of symbols]

 1 Compressed coil wire 2 Wire for wire wire 3 Terminal processing part 4 Tapered part 10 Wire winding machine 11 Supply roller 12 Cutter lower blade 13 Cutter upper blade 14 Winding block 20 Pitch control block

Claims (2)

[Claims] 1. A winding block is opposed to and supported at the tip of a supply path of the winding wire, and the wound wire is guided by the pitch control block that advances and retreats in the winding axis direction in the winding axis direction. A compression coil by a wire winding machine, in which a wire rod for wire winding is screwed to a predetermined coil outer diameter and pitch, and the rear end of the screw is cut by a cutter protruding toward the winding center axis at a predetermined total number of turns. In the production of a strip, a continuous strip wire to be supplied to the winding portion through the supply path is provided with a length pitch of the strip wire used for the compression coil strip to be produced, and the strips from both sides of the strip wire are A symmetrical winding end processing portion having a loose taper shape in which the lengths of the two tapered portions are approximately 2 to 3 times the outer diameter of the coil is formed in advance, and the tapered surface of the winding end processing portion is the same as the winding winding machine. Orthogonal to the moving direction of the pitch control block Of the coiled wire is supplied to the supply path, and the cutter is operated at the taper end position of the preceding coiled wire and the taper start end position of the subsequent coiled wire to be cut and separated. A method for manufacturing a coil spring, which is characterized by the above. 2. A coil outer diameter control position to be manufactured in accordance with the timing at which one taper end and one taper start end position of the winding end processing portion of the wire rod for wire drawing pass the winding block position of the wire winding winding machine. 2. The method for manufacturing a coil spring according to claim 1, wherein the winding block is controlled to move forward and backward so as to meet the condition and the control position condition associated with the deformation of the wire rod.