JP3124489B2 - Coil spring manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coil spring manufacturing apparatus, and more particularly to a coil spring manufacturing apparatus for manufacturing a coil spring for pressing a pellet of a nuclear fuel rod.

[0002]

2. Description of the Related Art In general, a nuclear fuel rod 10 is loaded with a number of pellets 14 and a coil spring 15 for pressing the pellets 14 inside a cladding tube 13 for mounting upper and lower end plugs 11, 12 as shown in FIG. ing.

The coil spring 15 has excellent mechanical properties,
A wire 22 made of stainless steel or the like that has stable dimensions and a constant spring and is free from dirt and scratches is used to prevent the quality of the nuclear fuel rod 10 from deteriorating.

[0006] As a coil spring manufacturing apparatus 20 for manufacturing the coil spring 15 from the wire material 22 such as stainless steel, an apparatus as shown in FIG.

More specifically, reference numerals 23 and 24 in the figure denote feed rollers for feeding a wire 22 such as stainless steel, and a wire guide 25 is provided on the feed side of the feed rollers 23 and 24.
Are arranged. The axis of the wire guide 25 is directed tangentially to the outer periphery of the coil to be formed. A plurality of coil forming tools 26 are provided.

[0006] The tip of the coil forming tool 26 has a wire 22
The bending member 27 having an arc-shaped groove corresponding to the diameter of the bending member 27 is fixed.

A semi-circular core 28 is fixed inside the coil to be formed, and an arc-shaped guide groove corresponding to the diameter of the wire 22 is formed on the arc-shaped outer peripheral surface.

A pitch processing tool 29 for displacing the coil-shaped wire 22 bent by the coil forming tool 26 in the axial direction of the coil is provided on the outer periphery of the formed coil. Between the pitch processing tool 29 and the coil forming tool 26,
The cutter 30 which cuts the wire 22 in cooperation with the straight line portion is provided. Reference numeral 21 in the figure denotes a lubricating oil application device that applies lubricating oil to the wire 22.

[0009] The coil spring manufacturing apparatus 2 configured as described above.
A case where a coil spring is manufactured with 0 will be described.

When the wire 22 fed by the feed rollers 23 and 24 is sent out to the wire guide 25, the side surface of the wire 22 is sequentially pressed against the bending member 27 of the coil forming tool 26 to cope with the movement of the wire 22. And the bending member 2
Due to the reaction force of 7, the wire is bent in a direction orthogonal to the wire 22, and is bent in a coil shape. The curved wire 22 is guided toward the pitch processing tool 29 by the guide groove of the cored bar 28, where the wire 22 is pushed up from the back side of the drawing to the front side, that is, in the axial direction of the coil, and the pitch processing of the coil is performed. Is performed. When the coil has a predetermined length, the cutter 30 is moved in the radial direction of the coil, the wire 22 is cut, and one coil spring is manufactured.

[0011]

However, in such an apparatus, the coil forming tool 26 in which the wire 22 is fixed is used.
And the like, while sliding on the surface, etc., the resistance due to friction is large and stable molding cannot be performed. Therefore, when the coil is formed by the coil spring manufacturing apparatus 20 as described above, the wire 22 made of stainless steel or the like is subjected to nickel plating as a lubricant, and the wire 2 which is fed as occasion demands.
2 needs to apply a large amount of lubricating oil.

However, since nickel plating, lubricating oil, dust and the like adhering to these become impurities of the nuclear fuel rod, the lubricating oil, dust and the like are removed after molding the coil spring, and the nickel plating is fluorinated. It must be peeled off with nitric acid or the like.

However, when lubricating oil, dust, and nickel plating cannot be completely removed, large facilities are required for cleaning and peeling operations, which not only deteriorates the quality of the nuclear fuel rod 10 but also increases the manufacturing cost of the coil spring. There was a problem to say.

In view of the above, it is an object of the present invention to provide a coil spring manufacturing apparatus capable of manufacturing a coil spring without plating a wire or applying lubricating oil.

[0015]

According to the present invention, as a means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a tip portion of a plurality of coil forming tools arranged in a circumferential direction of a coil to be formed is provided. A coil spring is manufactured, in which the wire materials sent from the feed roller are sequentially pressed and bent to form a coil shape, and the rear end face of the formed coil is sequentially deviated in the axial direction of the coil by a pitch processing tool to perform pitch processing. In the apparatus, the coil is formed by being provided at the tip of the coil forming tool and sequentially pressing the wire fed from the feed roller against the outer peripheral surface to form a coil, and contacting the outer peripheral surface of the coil to move the wire. A rotatable rotating roller and a rear end face of a coil formed by the rotating roller, which are provided at the tip end of the pitch processing tool, are pressed against each other, and the wire is transferred. Characterized in that and a rotary member that can be rotated by.

According to a second aspect of the present invention, in the first aspect of the invention, the rotating member is a columnar rotating body.

[0017]

[0018]

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coil spring manufacturing apparatus according to the present invention will be described below with reference to FIGS.

Since the coil spring manufacturing apparatus 50 of the present invention has basically the same structure as the conventional coil spring manufacturing apparatus 20, the same parts as those of the conventional apparatus are denoted by the same reference numerals and detailed description thereof will be omitted.

A rotary roller 52 is provided at the tip of a coil forming tool 51 of the coil spring manufacturing apparatus 50 so as to receive the wire 22 sent out via a wire guide 25.

That is, a rotating roller 52 having a circumferential groove 53 corresponding to the diameter of the wire rod 22 provided on the outer peripheral surface of the tip end of the coil forming tool 51 is pivotally supported, and is parallel to the axis of the coil to be formed. It is rotatable around the axis.

On the other hand, the tip of the pitch processing tool 55 is pressed against the wire 22 curved by the coil forming tool 51, and the reaction force causes the wire 22 to be deflected in the axial direction of the coil to process the pitch. Is provided rotatably about a line axis orthogonal to the axis of the formed coil.

The coil spring manufacturing apparatus 5 configured as described above
A case where a coil spring is manufactured with 0 will be described.

The wire 22 such as stainless steel is
3 and 24, and sent out in the direction of the coil forming tool 51 through the wire guide 25, the wire 2
The two side surfaces are engaged and pressed against the circumferential groove 53 of the rotating roller 52.

Therefore, the rotating roller 52 also rotates in response to the movement of the wire 22, and the wire 22 is bent by the reaction force from the rotating roller 52, and is sequentially coiled by the rotating roller 52 of each coil forming tool 51. Formed. The wire 22 of the coil moves to the rotating member 54 side of the pitch processing tool 55 through the vicinity of the outer periphery of the cored bar 28 and is pushed up from the back side of the paper to the front side by the rotating member 54 rotated by the movement of the wire 22. Pitch processing is performed. When the coil has a predetermined length, it is cut by the cutter 30 to manufacture a coil spring.

According to the coil spring manufacturing apparatus 50, since the rotary roller 52 is provided at the tip end of the coil forming tool 51, the wire 22 circumscribing the rotary roller 52 moves smoothly while rotating the rotary roller 52, and friction is generated. Since there is no slip, mutual frictional resistance is significantly reduced. for that reason,
The processing performance of the coil spring can be improved.

Further, since the pitch processing tool 55 is provided with the rotating member 54, the coil wire 2 in contact with the rotating member 54
No. 2 moves smoothly while rotating the rotating member 54 and has no frictional slip, so that the coil can be easily pressed in the axial direction, and the coil can be pitch-processed with its frictional resistance reduced. .

Therefore, it is not necessary to apply nickel plating to the wire rod 22 at the time of coil forming, and it is not necessary to apply lubricating oil to improve the slip. Therefore, it is possible to prevent the quality of the nuclear fuel rod from deteriorating.

Further, after the coil spring is manufactured, it is not necessary to peel off the nickel plating or to clean the lubricating oil, so that the manufacturing cost of the coil spring can be greatly reduced. In the above embodiment, the lubricating oil is not applied, but a lubricating oil applying device is provided if necessary.
Lubricating oil may be applied to the wire.

[0031]

As described above, according to the present invention, the coils fed from the feed roller are sequentially pressed against the tips of a plurality of coil forming tools arranged in the circumferential direction of the coil to be formed. In a coil spring manufacturing apparatus for forming a bent shape in the shape of a coil and sequentially pitching the rear end face of the formed coil by using a pitch processing tool in the axial direction of the coil, the coil spring manufacturing apparatus is provided at a tip end of the coil forming tool. A rotating roller capable of rotating a wire sent from a feed roller in order to contact the outer peripheral surface of the wire and sequentially rotate the roller by moving the wire in contact with the outer peripheral surface of the coil. A rotating member provided at the leading end portion, which is capable of pressing the rear end face of the coil formed by the rotating roller and rotating by moving the wire. Since the, it is possible to reduce the frictional resistance of the wire, such as stainless steel during molding and during pitch processing into coiled.

[0032]

Therefore, not only does the wire need not be plated with nickel or coated with lubricating oil to form the coil, but also the steps of stripping and cleaning these plating and lubricating oil become unnecessary, and the cost of forming the coil is significantly reduced. Can be reduced.

Further, when a coil spring is manufactured by using the material plated with nickel by the apparatus of the present invention, no lubricating oil is required, and the lubricating oil does not need to be washed after processing, so that the manufacturing cost can be reduced. .

In addition, since nickel plating, lubricating oil does not remain on the wire, and dust does not adhere to the wire, it is possible to prevent the quality of the nuclear fuel rod from deteriorating.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of a coil spring manufacturing apparatus according to the present invention.

FIG. 2 is a front view showing a coil forming tool used in the apparatus shown in FIG.

FIG. 3 is a peripheral view of a rotating roller of the coil forming tool of FIG. 2;

FIG. 4 is a side view showing a coil pitch processing tool used in the apparatus of FIG. 1;

FIG. 5 is a partial cross-sectional side view of a commonly used nuclear fuel rod.

FIG. 6 is a front view showing a main part of a conventional coil spring manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Nuclear fuel rod 11, 12 End plug 13 Clad tube 14 Pellet 15 Coil spring 20, 50 Coil spring manufacturing device 22 Wire rod 23, 24 Feed roller 25 Wire guide 26 Coil forming tool 27 Bending member 28 Core metal 29 Pitch processing tool 30 Cutter Reference Signs List 51 coil forming tool 52 rotating roller 53 circumferential groove 54 rotating member 55 pitch processing tool

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-27133 (JP, A) JP-A-49-56869 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G21C 21/00 G21C 3/18 B21F 3/04 B21F 35/00

Claims (2)

(57) [Claims] 1. A coil formed by bending a coil material by sequentially pressing wires fed from a feed roller to tips of a plurality of coil forming tools arranged in a circumferential direction of a coil to be formed. A coil spring manufacturing apparatus that performs pitch processing by sequentially deviating the rear end face in the axial direction of a coil with a pitch processing tool, wherein a wire rod provided at a tip end of the coil forming tool and sequentially fed from the feed roller is sequentially outer circumference. A rotary roller that is brought into pressure contact with the surface to form a coil and that is in contact with the outer peripheral surface of the coil and that can be rotated by the movement of the wire rod, and is provided at the tip of the pitch processing tool and is formed by the rotary roller. A rotary member that presses against the rear end face of the formed coil and is capable of rotating by movement of the wire rod. 2. The coil spring manufacturing apparatus according to claim 1, wherein the rotating member is a columnar rotating body.