JP2005001397A - Bending method and bending jig for resin tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bending method and a bending jig for a resin tube, which are free from leakage in a joint of a liquid or the like due to absence of a pipe joint use, applicable also to resins other than thermoplastic resin materials, capable of performing a bending in a short time by using only a simple jig without needing an operator skill. <P>SOLUTION: A bent section is formed in the resin tube by means of: inserting a rod-like bending jig, which is flexible and has an outer diameter slightly smaller than the internal diameter of the resin tube, into the resin tube workpiece roughly straight in shape; distorting the resin tube and the bending jig into an aimed form by applying an external force; and taking the bending jig off the resin tube. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  INDUSTRIAL APPLICABILITY The present invention is used in a semiconductor manufacturing apparatus or the like, and a bending method and bending jig for a resin tube formed of a relatively small diameter fluororesin having an outer diameter of about 1/4 inch to 3/4 inch. About.

  Conventionally, when bending a resin tube formed of a relatively small diameter fluororesin, etc., if the resin tube is bent by simply applying an external force as it is, the resin tube will be bent at the bent portion and the tube will be For example, as shown in FIG. 2, a method of connecting two orthogonal resin pipes 12 and 12 using a pipe joint 11 such as an elbow is used.

  Further, as a method of bending without using such a pipe joint, in the case of a thermoplastic resin material, the resin pipe is gradually deformed by applying heat from the outside to the bent portion of the resin pipe. There is a way to get the shape.

  In addition, as a method of using a jig for bending, as shown in FIG. 3, a thermoplastic resin fine material as a workpiece that has been cut into a predetermined length as shown in FIG. The long diameter material 21 is inserted into a relatively soft metal pipe member 22 having a required length slightly larger than the outer diameter of the long material, and then manually bent by a bending jig or a bender device. Is subjected to a desired integral bending process by automatic bending or the like, and then heat-treated in a heat treatment furnace in a state of being integrally bent, and then cooled to cause the long material 21 to have a permanent bent shape accompanying curing. Furthermore, there was a method of pulling out the long material 21 from one end side thereof.

JP-A 64-75221

  However, when two orthogonal resin pipes are connected using a pipe joint such as an elbow, if the seal is insufficient at the joint between the pipe joint and the resin pipe, the liquid in the pipe will be exposed to the outside. There was a risk of leakage. Moreover, the process for couple | bonding a coupling and a resin pipe was required.

  Further, in a method in which a thermoplastic resin material is deformed by applying heat without using such a joint, and then bent into a desired shape, the resin pipe is gradually heated while being heated. Since the resin tube has to be bent, it takes a long time for the bending work, and an operator with a high level of skill is required to form a smooth bent portion.

  Furthermore, in the conventional method using a jig for bending, as in the method of performing bending while heating, it can be applied only to a thermoplastic resin material, and heat treatment in a heat treatment furnace, It could be applied only to resin materials that can withstand permanent bending by cooling and pull out long materials as bending jigs.

  Therefore, the present invention has been made in view of the above problems, and since there is no use of a pipe joint, there is no risk of leakage of liquid or the like at the connecting portion, and it is also applicable to resins other than thermoplastic resin materials. An object of the present invention is to provide a resin pipe bending method and a bending jig that can be bent in a short time without the skill of an operator by using a simple jig. To do.

  In order to achieve the above object, the present invention provides a method for bending a resin tube, wherein a substantially straight resin tube as a workpiece is provided with an outer diameter and a flexibility slightly smaller than the inner diameter of the resin tube. By inserting a rod-shaped bending jig having a property, applying an external force to the resin tube and the bending jig to deform it into a desired shape, and removing the bending jig from the resin tube. A bent portion is formed in the resin tube.

  And according to this invention, even if it does not use heat and a pipe joint, a bending part can be formed in a resin pipe only by using a simple jig | tool.

  Further, the present invention is a resin tube bending jig, formed in a rod shape having an outer diameter and flexibility slightly smaller than the inner diameter of a substantially linear resin tube as a workpiece, The resin tube can be deformed into a desired shape by an external force applied to the resin tube and the bending jig, and a desired bent portion is formed in the resin tube after being extracted from the resin tube. It is characterized by that.

  According to the present invention, a bent portion can be easily formed in a resin pipe without using heat and a pipe joint.

  The bending jig can be formed of a stainless steel wire wound in a coil shape. As a result, a smooth bent portion can be formed in the resin tube.

  As described above, according to the present invention, since heat is not used, it can be used for a resin material that does not have thermoplasticity, and since a pipe joint is not used, there is no possibility that liquid in the pipe leaks to the outside. The present invention provides a method for bending a resin pipe that does not require a process for joining a joint and a resin pipe, and can be bent in a short time without using the skill of an operator by using a simple jig. be able to.

  In addition, since the present invention does not use heat, it can also be used for resin materials that do not have thermoplasticity, and since pipe fittings are not used, there is no risk of leakage of liquid in the pipe to the outside. It is possible to provide a jig for bending a resin pipe that does not require a process for joining pipes and can be bent in a short time without the skill of an operator.

  Furthermore, the present invention provides a resin pipe bending jig capable of forming a smooth bend by using a resin pipe bending jig made of a stainless steel wire wound in a coil shape. Can do.

  Next, a specific example of an embodiment of a resin tube bending method and bending jig according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing a method of bending a resin pipe according to the present invention. Reference numeral 1 denotes a resin pipe made of a substantially linear fluororesin as a workpiece. It is bent by the tool 2.

  As shown in FIG. 1A, the resin tube 1 is a resin tube formed as a relatively soft long material having a relatively small outer diameter of about 1/4 inch to 3/4 inch. , Having a substantially constant thickness and a substantially constant inner diameter.

  As shown in FIG. 1B, the bending jig 2 is formed by winding a stainless steel wire in a coil shape, and has an outer diameter slightly smaller than the inner diameter of the resin tube 1, and a resin tube. When it is inserted in 1, it contacts the inner surface of the resin tube 1 only at the outermost part of the coiled portion, so that it can be easily passed through the bending jig 2. The bending jig 2 has flexibility, can be easily deformed in accordance with the applied bending force, and can be returned to its original state.

  Next, a bending method according to the present invention using the jig will be described. First, as shown in FIG. 1C, a bending jig 2 is inserted into the resin tube 1, and the bending jig 2 is positioned at a portion of the resin tube 1 to be bent. In the state of FIG. 1 (c), the resin tube 1 is bent into a desired shape as shown in FIG. 1 (d) by gripping both ends of the bending jig 2 from the outside and applying a bending force. Apply.

  At this time, since the bending jig 2 is bent integrally with the resin tube 1 inside the resin tube 1, the inner surface of the resin tube 1 is the axis of the resin tube 1 due to the presence of the bending jig 2. Therefore, the inner cross section of the resin tube 1 is not narrowed by bending deformation as in the prior art. Further, since the bending jig 2 is formed in a coil shape, it bends with a constant curvature with respect to the applied bending force, so that the resin tube 1 having a smooth bent portion can be obtained.

  Then, the bending jig 2 is extracted from one open end of the resin tube 1, and a desired bent shape of the resin tube 1 is obtained as shown in FIG. At this time, only the outermost part of the coiled portion of the bending jig 2 is in contact with the inner surface of the resin tube 1, and the bending jig 2 is flexible and easily released when the bending force is released. Since it can return to the original substantially linear state, it can be easily removed from the resin tube 1.

  In the above embodiment, the resin tube is made of fluororesin, but even if it is not made of fluororesin, it will bend when a certain bending stress is applied, and maintain its state even after the stress is released. The present invention can be applied to any resin that can be used. Further, the bending jig 2 is not limited to stainless steel but can be formed of other metals or the like. Furthermore, even if it is not configured in a coil shape, the bending jig 2 is flexible and has an applied bending force. It is sufficient if it is configured so that it can be easily deformed and returned to its original state.

(A) is a resin tube as a workpiece, (b) is a coiled stainless steel jig as an embodiment of a bending jig according to the present invention, and (c) is for the bending. The figure which shows the state which inserted the jig | tool into the resin pipe, (d) is a figure which shows the state which applied the bending force to the said bending jig from the outside, and deform | transformed the resin pipe into the desired bending shape, (e) These are figures which show the resin pipe in the state where the bending jig was pulled out from the resin pipe and the bending process was completed. It is the schematic which shows the state which connected the two resin pipes orthogonally using an elbow joint as an example of the bending method of the conventional resin pipe. It is the schematic which shows the method of bending a thermoplastic resin thin diameter long material using a bending jig as an example of the conventional bending method of a resin pipe.

Explanation of symbols

1 Resin pipe 2 Bending jig

Claims (3)

  A rod-shaped bending jig having an outer diameter and flexibility slightly smaller than the inner diameter of the resin pipe is inserted into a substantially linear resin pipe as a workpiece, and the resin pipe and the bending process are inserted. A bending method for a resin pipe, wherein an external force is applied to the jig for deformation to form a desired shape, and the bending jig is removed from the resin pipe to form a bent portion in the resin pipe.   A jig for bending a resin tube, which is formed into a rod shape having an outer diameter and flexibility slightly smaller than the inner diameter of a substantially linear resin tube as a workpiece, and is inserted into the resin tube The resin tube can be deformed into a desired shape by an external force applied to the resin tube and the bending jig, and a desired bent portion is formed in the resin tube after being extracted from the resin tube. Jig for pipe bending.   3. The resin pipe bending jig according to claim 2, wherein the bending jig is made of a stainless steel wire wound in a coil shape.

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