JP2008110366A - Method for producing grip ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a grip ring by which productivity is enhanced by continuously machining the cutting of a joint part by using an automatic machine. <P>SOLUTION: In the production method for the grip ring, a wire rod is straightened and is then cut into prescribed dimensions to prepare a short-length bar material 1. The cutting process of both the edge parts the bar material 1, that is, the parts corresponding to the joint parts in both the edges of a ring after coiling is performed prior to a stage of working the wire rod into a ring shape (coiling). In this way, the machining is performed by continuous machine process, thereby enhancing the productivity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a grip ring that is fitted into a pipe joint for connecting pipes such as water pipes and that prevents the pipe inserted into the pipe joint from moving in the axial direction.

In recent years, water pipes are mainly made of synthetic resin. And what was described, for example in patent document 1 is used as the pipe joint.
Japanese Patent Publication No. 2001-507782

  6 and 7, reference numeral 3 denotes a rotatable joint piece, and reference numeral 4 denotes a fixed joint piece. The pipe joint is formed on the inner surface of the joint piece 3. The grip ring 2 is closely fitted in the shallow groove. A locking piece 5 is engaged with one end of the grip ring 2, and the locking piece 5 is fixed by a fastening mechanism including a bolt 6 and a nut 7. The grip ring 2 is made of a steel material, and as shown in FIG. 7 (a), is formed in a circular ring shape having a cut-out part in a plan view, and a plurality of wedge-shaped inner surfaces thereof. A groove 12 is formed.

  A rubber gasket 8 is in close contact with the inner surface of the fixed joint piece 4, and the inner diameters of the grip ring 2 and the gasket 8 are slightly larger than the outer diameter of the tubular body inserted into the pipe joint. Yes.

When a tubular body is inserted into this pipe joint from both sides, the bolt 6 is removed from the nut 7 and the locking piece 5 is pulled out, the grip ring 2 is formed into a wedge-shaped groove formed on the inner surface of the grip ring 2 by a spring action. 12 is inserted into the inserted tubular body, and the axial movement of the tubular body is prevented. Further, the joint piece 3 is rotated along the inner surface of the joint piece 4 to firmly fix the bolt 6 and the nut 7.
In this way, according to the pipe joint using the grip ring 2, the tubular body is not allowed to move in the axial direction, and the tubular body can be firmly fixed to the pipe joint.

  Conventionally, the grip ring 2 has been manufactured by a manufacturing method as described in Patent Document 2, for example.

Next, the manufacturing method of the grip ring described in Patent Document 2 will be described.
In FIG. 8, the code | symbol 9 has shown the steel wire wound by the coil shape, and the code | symbol 10 shows the cutting device which unwinds this steel wire and performs a continuous wedge groove process on this.
After processing the wedge-shaped grooves (indicated by reference numeral 12 in FIG. 7) on the steel wire 9 by the cutting device 10, the steel wire 9 is sent to the ring processing device 11, where the steel wire 9 is processed into a ring shape ( (Coiling). The ring processing device 11 incorporates a shearing device 12 for cutting the wire processed into a ring shape into a predetermined length, and the wire a processed into a ring shape by the shearing device 12 is cut into a predetermined length. Then, this (ring-shaped wire a) is sent to a device (for example, a milling machine, not shown) that cuts both end faces (abutting portions), where the cutting processing is performed on the abutting portion of the ring-shaped wire a. The grip ring 2 as shown in FIG. 7A is manufactured.
JP 2003-145241 A

As described above, the conventional method for manufacturing a grip ring (described in Patent Document 2) is performed after the abutment is cut into a ring shape. By the way, since this process is a process of cutting the inner surface of the ring after forming the wire into a ring shape, this process is very difficult, so continuous processing by an automatic machine is impossible, and it takes time-consuming manual work. Inevitably, this is a cause of productivity loss.
The present invention intends to solve such problems in the conventional method of manufacturing a grip ring.

  The present invention relates to a method of manufacturing a grip ring, which is made of a wire, is formed into a circular ring shape having a cutout part in a plan view, and a plurality of wedge-shaped grooves are formed on the inner surface. It is characterized in that the joint portion at both ends is cut prior to.

  Specifically, in a manufacturing method of a grip ring made of a wire, formed into a circular ring shape having a cutout part in a plan view, and a plurality of wedge-shaped grooves formed on the inner surface, The first step of cutting the wire into a predetermined length, the second step of cutting the joint portion at both ends of the wire cut into the predetermined length in the first step, and the wire obtained in the second step It is characterized by comprising a third step of forming a plurality of wedge-shaped grooves and a fourth step of processing the wire obtained in the third step into a ring shape.

Further, in the manufacturing method of the grip ring, which is made of a wire, is formed into a circular ring shape having a cutout part in a plan view, and a plurality of wedge-shaped grooves are formed on the inner surface.
A first step of cutting the wire into a predetermined length; a second step of forming a plurality of wedge-shaped grooves in the wire obtained in the first step; and a second step of cutting the wire into a predetermined length. It consists of the 3rd process which cuts the abutment part of the both ends of a wire rod, and the 4th process which processes the wire material obtained at the 3rd process into a ring shape.

  In the manufacturing method of the grip ring according to the present invention, after straightening the wire, it is cut into a predetermined size to form a short bar material, which corresponds to both ends of the ring, that is, the joints at both ends of the ring after coiling. Since the part to be cut is cut, that is, prior to the step of processing the wire into a ring shape (coiling process), the abutment at both ends of the ring is cut. -Since it becomes the end surface processing of material, this processing can be performed by continuous machining, and productivity can be improved.

An embodiment of the present invention will be described with reference to the drawings.
The steel wire wound in a coil shape was provided with two pairs of upper and lower shape correction rollers 15, 15 and 16, 16 and two pairs of left and right shape correction rollers as shown in FIG. Straight processing is performed by a straight machine with a normal structure to process the linear wire 20 (first step).
As shown in FIG. 2, each roller desirably has a shape along the outer shape of the metal wire 20 having a circular cross section.
As the wire for the grip ring, a stainless steel wire for a spring (particularly SU304-WPB according to JIS-G-4341) is preferable. Moreover, although the tensile strength changes with wire diameters, it is preferable that it is 500-2000 N / mm < ² >.
The wire 20 processed into a linear shape preferably has a deflection (amount of deviation from a straight line) of 20 mm / m or less. If this numerical value exceeds 20 mm / m, a small amplitude vibration is generated during the formation of the wedge-shaped groove, which may cause a processing failure.

The wire rod 20 obtained by straight processing in the first step is cut into a predetermined dimension (a length corresponding to the circumferential length of the finished grip ring), and the bar member 1 shown in FIG. 2 steps).
Next, both ends of the bar material 1, that is, portions corresponding to the joint portion of the grip ring are cut (third step) to be processed into the shape shown in FIG.
This process is a process of scraping off both ends of the linear bar material 1, and the process itself is simple and simple. Therefore, a general-purpose milling machine can be used without requiring a special cutting machine. Automatic processing is possible by supplying a straight bar material to the milling machine, and incorporating an automatic supply / discharge device that discharges the bar material from the milling machine after the abutment processing. The automatic supply / discharge mechanism is a simple and easy mechanism because the bar material is linear.

  Next, the bar material 1 having both ends cut by the third step is moved from above and below with the upper and lower holding rollers 47 and 48 as shown in FIG. 3, for example. A plurality of wedge-shaped grooves 12 are formed while preventing the warping of the bar material 1 by means of an apparatus provided with a cutting roller 49 provided on the side of the bar material 1 by firmly clamping (fourth). Process). Reference numeral 25 denotes a cutting blade. By this fourth step, the bar material 1 is formed in the cross-sectional shape shown in FIG. In FIG. 3, reference numeral 50 is a motor, reference numeral 51 is a drive sprocket directly connected to the motor 50, reference numeral 52 is a driven sprocket, reference numeral 53 is a belt stretched between both sprockets, and reference numeral 54 is a driven. As shown by the shafts attached to the sprocket, the cutting roller 49 is configured to be rotationally driven by a motor 50.

In order to process the bar material 1 obtained in the above fourth step into a ring shape, it is sent to a ring processing apparatus (fifth step).
With this ring processing apparatus, the bar material 1 obtained in the fourth step can be formed on the grip ring 2 having the shape shown in FIG. 1D, that is, FIG. 7A.

  As described above, according to the manufacturing method of the grip ring of this embodiment, after straightening the metal wire, it is cut into a predetermined size to form a short bar, and both ends thereof, that is, after coiling Because the part that becomes the joint part at both ends of the ring is cut, that is, before the step of processing the wire into a ring shape (coiling process), the joint part at both ends of the ring is cut and processed. The cutting of the joint portion is the end face processing of the bar material, and this processing can be performed by continuous machining. As a result, the productivity of the grip ring can be improved.

(A), (b), (c), (d) is the schematic which shows the process of the manufacturing method of the grip ring concerning one Embodiment of this invention, (c) is the AA line of (b). It is sectional drawing. (A), (b) is the schematic of the principal part of a straight processing machine. 1 is a schematic view of a multiple wedge-shaped groove forming apparatus. FIG. It is a perspective view of a pipe joint using a grip ring. (A) It is a perspective view of a grip ring. (B) It is BB sectional drawing of Fig.5 (a). It is the schematic of the conventional grip ring manufacturing apparatus.

Explanation of symbols

1: Bar material 2: Grip ring 3, 4: Joint piece 5: Locking piece 8: Gasket 9: Steel wire rod (wound in a coil shape) 10: Cutting device
12: Wedge-like grooves of multiple strips 25: Cutting blade 15, 16: Shape correction roller 47, 48: Pressing roller 49: Cutting roller

Claims (3)

In a manufacturing method of a grip ring made of a wire, formed into a circular ring shape having a cutout part in a plan view, and a plurality of wedge-shaped grooves formed on the inner surface,
A first step of cutting the wire to a predetermined length, a second step of cutting the joint portions at both ends of the wire cut to a predetermined length in the first step, and the wire obtained in the second step A method for manufacturing a grip ring, comprising: a third step of forming a plurality of wedge-shaped grooves, and a fourth step of processing the wire obtained in the third step into a ring shape. In a manufacturing method of a grip ring made of a wire, formed into a circular ring shape having a cutout part in a plan view, and a plurality of wedge-shaped grooves formed on the inner surface,
A first step of cutting the wire into a predetermined length; a second step of forming a plurality of wedge-shaped grooves in the wire obtained in the first step; and a second step of cutting the wire into a predetermined length. A grip ring manufacturing method comprising: a third step of cutting a joint portion at both ends of a wire rod; and a fourth step of processing the wire rod obtained in the third step into a ring shape.   The method of manufacturing a grip ring according to claim 1 or 2, wherein the wire is a steel wire.