JP3946311B2 - Resin pipe with metal short pipe and its manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin pipe with a short metal pipe used for an intake pipe or the like of a vehicle and a manufacturing apparatus thereof.
[0002]
[Prior art]
A major improvement target for automobiles is to improve fuel efficiency, and an effective measure is to reduce weight. As one of measures for reducing the weight, a method is adopted in which an intake pipe made of aluminum or iron pipe is made of resin.
However, because of the resin, the hose fitting part may creep and the sealing performance with the rubber hose may not be ensured. So far, the short metal pipe on the inner side corresponding to the hose fitting part of the resin pipe The metal short pipe has been devised so as to prevent the metal short pipe from coming off.
Specifically, with the aim of ensuring sealing performance and preventing the metal short tube from coming off, (1) the inner diameter d ₁ ′ of the resin pipe 92 is slightly set smaller than the outer diameter d ₁ of the metal short tube 91 as shown in FIG. Reduce (Prior Art 1). Alternatively, (2) as shown in FIG. 11, measures have been taken such as attaching a bead-shaped small protrusion 96 to the short metal tube 95 and fitting it into the recess 98 of the resin pipe 97. In this way, it was possible to prevent detachment as well as ensuring sealing performance.
[0003]
[Problems to be solved by the invention]
However, according to the prior art 1, after the resin pipe 92 is formed and the metal short pipe 91 is press-fitted, before the rubber hose 93 is assembled by the vehicle manufacturer, the resin absorbs moisture in the atmosphere. The stress of the resin tightening the metal short tube 91 is relaxed, and d ₁ ′ ≧ d ₁ , which may cause the metal short tube 91 to come off. If it is assembled as it is, the seal will be inferior, leading to problems with the vehicle.
On the other hand, according to the prior art 2, when the metal short pipe 95 is press-fitted, the resin pipe 97 is further expanded, so that there is a possibility that the pipe 97 may break, or the resin pipe recess 98 and the short metal pipe are small. If the projections 96 do not fit perfectly, the resin pipe 97 may be deformed and the outer diameter may be distorted.
[0004]
The present invention solves the above-mentioned problems, and does not cause deformation of the resin pipe, and further prevents the short metal pipe inserted into the resin pipe from being integrated and removed reliably. And it aims at providing the manufacturing apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the gist of the invention described in claim 1 is that a short metal pipe is inserted from one opening of the resin pipe, and the short metal pipe is locked by a step provided in the resin pipe. A resin pipe with a short metal pipe characterized in that the resin pipe is formed in a small piece covering the end face of the short metal pipe inside the pipe by being subjected to plastic deformation partially while being accommodated in the resin pipe. is there. Here, the “step portion” includes a slope. The “small piece” may be a part of the pipe that was formed before the processing of the resin pipe with the short metal pipe, and may be plastically deformed to cover the end face of the short metal pipe. Alternatively, a tongue piece formed by inserting a notch or the like from the beginning may be subjected to plastic deformation so as to cover the end face of the short metal pipe.
Further, the gist of the invention of claim 2 is that a press-fitting jig (A) is fixed to the operating shaft of the actuator (1), and the press-fitting jig includes a columnar part (4) into which a short metal tube can be inserted, A presser part (3) that comes into contact with the actuator-side end surface of the extra short metal pipe, and a small protrusion (5) that can deform the resin pipe opening edge by pressing when the actuator operating shaft extends. And manufacturing a resin pipe with a short metal pipe, wherein the short metal pipe is inserted into the columnar portion and inserted into the resin pipe, and the opening of the resin pipe is partially plastically deformed inside the pipe by the small protrusion. In the device. Here, “the plastic pipe opening edge is partially plastically deformed to the inside of the pipe” includes a case where the plastic deformation portion extends to several places of the resin pipe opening edge.
The apparatus for producing a resin pipe with a short metal pipe according to a third aspect of the present invention is the apparatus according to the second aspect, wherein a heating element is used instead of the small protrusion.
[0006]
As in the first and second aspects of the invention, when the resin pipe opening edge is partially plastically deformed to form a small piece covering the end face of the short metal pipe, the short metal pipe inserted into the resin pipe is locked to the small piece. So it will no longer come off. Since it is not necessary to make the outer diameter of the short metal pipe larger than the inner diameter of the resin pipe, the resin pipe is not broken and the outer diameter of the resin pipe is not distorted.
Moreover, when the press-fitting jig as in claim 2 is used, the short metal pipe can be inserted into the resin pipe and the small piece of the short metal pipe can be processed at the same time, which makes it possible to manufacture a resin pipe with a short metal pipe. It will be easy. If the heating body as in claim 3 is employed, the plastic deformation of the resin pipe is effectively promoted, so that the production of the resin pipe with a short metal pipe is further facilitated.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a resin pipe with a short metal pipe and a manufacturing apparatus thereof according to the present invention will be described in detail.
[0008]
(1) Manufacturing apparatus for resin pipe with short metal pipe FIGS. 1 to 9 show an embodiment of a manufacturing apparatus for resin pipe with short metal pipe according to the present invention. FIG. The whole perspective view showing the manufacturing apparatus of the resin pipe with a metal short pipe together with the resin pipe, FIG. 2 is the principal part top view of FIG. 1, FIG. 3 is the principal part side view of the manufacturing apparatus of the resin pipe with a metal short pipe, 4 is an overall perspective view showing a state in which a short metal tube is fitted into a columnar portion from the state of FIG. 1, FIG. 5 is a sectional view around a small protrusion showing a process of forming a small piece, and FIG. 6 is another alternative to FIG. Fig. 7 is a perspective view, Fig. 8 is a longitudinal sectional view, and Fig. 9 is a side view of a resin pipe with a short metal pipe manufactured by this manufacturing apparatus. The resin pipe with a short metal pipe is applied to the intake pipe.
[0009]
The apparatus for producing a resin pipe with a short metal pipe according to the present invention has a press-fitting jig A fixed to an actuator 1 as shown in FIG. 1. The press-fitting jig A has a base part 2, a notch disk part 3 as a pressing part, and a columnar shape. A portion 4 and a small protrusion 5 are provided.
The main part of the intake pipe as the final product is a plastic pipe 6 made of synthetic resin, and a metal short metal pipe 7 is integrally assembled from one opening of the resin pipe 6 into the resin pipe by the manufacturing apparatus of the present invention. It is crowded. The resin pipe 6 is provided with an enlarged diameter portion 62 that matches the short metal pipe 7 in the vicinity of the opening 61, and the end of the enlarged diameter portion 62 is a stepped portion 63 (FIG. 2). The inner diameter D ₁ of the enlarged diameter portion 62 is slightly larger than or equal to this and the metal short tube outside diameter D _2. Accordingly, the short metal pipe 7 inserted into the resin pipe 6 is locked when it reaches the stepped portion 63. At this time, the metal short tube 7 is pushed into the resin pipe 6 by the pushing amount α of several millimeters (FIG. 8).
[0010]
As the actuator 1, this embodiment employs an air cylinder. A circular base portion 2 is fixed to the tip of a rod 11 which is an operating shaft of the air cylinder 1. The central axis O of the rod 11 and the base portion 2 coincides.
The base portion 2 of the press-fitting jig A is a disk that is slightly larger than the outer diameter D ₅ of the resin pipe 6 (FIG. 2). Small protrusions 5 to be described later are formed on the base portion. The base part 2 plays a role of regulating the amount of insertion when the short metal pipe 7 is pushed into the resin pipe 6 and at the same time partially pipes the resin pipe opening edge 61a with the small protrusion 5 (including several places). It plays a role as a resin pipe bending portion that is plastically deformed inward (described later).
On the base portion, a notch disk portion 3 is provided with the central axis O being the same.
[0011]
The notch disk part 3 as a pressing part has a size capable of coming into contact with the actuator-side end surface of the short metal pipe 7 inserted on a columnar part 4 described later. The cutout disk portion 3 has an outer diameter D ₁ ′ substantially equal to the outer diameter D ₂ of the short metal tube 7 and is sized to be inserted into the resin pipe together with the short metal tube 7. The notch disk portion 3 serves as a push-in portion for pushing the short metal tube 7 into the resin pipe 6, and the thickness t ₁ is the same as the set push amount α of the short metal tube 7 from the resin pipe opening edge 61a. (Figs. 2 and 8). The specific thickness t ₁ of the notch disk portion 3 is 2 to 10 mm (more preferably 2 to 3 mm).
The cutout disk portion 3 is literally formed with a groove 31 cut out in the radial direction (FIG. 1). The range in which the size of the groove 31 is bent by plastic deformation of the resin pipe 6 is regulated. In the present embodiment, the grooves 31 are formed in two places at the top and bottom (FIG. 3). The depth P of the groove 31 is substantially equal to the plate thickness t _{2 of the} short metal tube 7 up to the outer surface level of the columnar section 4 described later. The groove width W ₁ is set larger than the width W ₂ of the small protrusion 5 described later, and a more preferable value is in the range of 3 to 5 times the small protrusion width W ₂ . This is to prevent the small protrusions 5 from hindering plastic deformation of the resin pipe 6.
[0012]
The columnar portion 4 has a shape into which the short metal tube 7 can be inserted, and here, it is a substantially cylindrical body having a tip portion 41 in the shape of a frustum. The columnar part 4 is provided on the cutout disk part 3 with the central axis O aligned, and serves as a holding part for the short metal pipe 7.
Columnar portion 4 has an outer diameter D ₃ 'is the same or slightly smaller setting the inner diameter D ₃ of the metal short tube 7. The length L of the columnar portion 4 is not particularly limited, but when the metal short tube 7 is inserted and inserted, the length L should be ½ or more of the length S ₁ of the metal short tube 7 so that it can be easily held. Good.
[0013]
The small protrusion 5 has a shape that can deform the resin pipe opening edge by pressing when the operating shaft 11 of the actuator 1 is extended. In the present embodiment, the small protrusion 5 is a bulge protruding from the base portion surface into each groove 31. The cross-sectional shape is a substantially trapezoid as shown in FIG. This is because it is easy to concentrate the force toward plastic deformation of the resin. The small protrusion 5 protrudes from the base portion surface toward the columnar portion 4 and near the center of the groove 31. The width W ₂ of the small protrusion 5 corresponds to the upper base portion of the trapezoid.
Further, the protruding length h of the small protrusion 5 is set to be smaller than the thickness t ₁ of the notch disk portion 3 (FIG. 2). The opening edge 61a of the resin pipe 6 is partially plastically deformed by the pressing of the small protrusion 5 so that the small piece 64 can be formed on the end surface of the short metal tube 7 inserted into the resin pipe 6. It is.
Furthermore, in the present embodiment, the root portion 51 of the small protrusion 5 is tilted (recessed) toward the air cylinder as it approaches the central axis O as shown in FIG. This is because the plastically deformed resin is bent and deformed toward the inside of the pipe along the slope 51a of the base portion (b in FIG. 5), and the small piece 64 is easily formed on the end surface 71 of the metal short tube 7. . In place of FIG. 5 (a), forming the base portion 51 of the small protrusion 5 into a bay shape as shown in FIG. 6 (a) also facilitates the formation of a small piece 64 that can be bent inside the pipe (b in FIG. 6). It becomes.
Further, the small protrusion 5 here is one that plastically deforms the resin pipe 6 by pressing to produce a small piece 64. Instead, a heating body (not shown) such as a heater is provided at the position of the small protrusion 5. Also good. This is because heat can be applied to a predetermined portion of the resin pipe opening edge 61a to facilitate deformation. Of course, when the heating body is substantially the same as the shape of the small protrusions 5, a synergistic action is exerted, which is more preferable.
[0014]
Next, the manufacturing method and operation of a resin pipe with a short metal pipe using the apparatus for producing a resin pipe with a short metal pipe will be described.
First, a cylindrical metal short tube 7 is fitted into the columnar portion 4 (FIG. 1). Since the columnar part 4 has a head 41 in the shape of a frustum, the short metal tube 7 can be easily inserted. Since the outer diameter D ₃ ′ of the columnar part 4 substantially coincides with the inner diameter D ₃ of the short metal tube 7, the inserted short metal tube 7 is firmly held (FIG. 4).
Next, the opening 61 of the resin pipe 6 to which the metal short tube 7 is to be inserted is aligned with the front position of the metal short tube 7, and the resin pipe 6 is fixedly set.
[0015]
Thereafter, the air cylinder 1 is only activated as a manufacturing operation.
By the operation of the air cylinder 1, the rod 11 is extended, and the metal short pipe 7 is inserted into the inside from the opening 61 of the resin pipe 6. Since the outer diameter D ₂ of the metal short tube 7 are below the inner diameter D ₁ of the plastic pipe 6, the metal short tube 7 is gradually inserted smoothly. The cutout disk part 3 which is a pushing part of the short metal pipe 7 also enters the resin pipe.
Then, when the short metal pipe 7 is inserted and the notched disk portion 3 is also inserted, the portion of the small protrusion 5 comes into contact with the opening edge 61a of the resin pipe 6 (a in FIG. 5). However, the metal short tube 7 and the press-fitting jig A are further press-fitted into the resin pipe 6 by the force of the air cylinder 1. The small protrusion 5 presses a part of the pipe opening edge 61a with the pressing force of the air cylinder 1, and further, since the pressing part of the small protrusion 5 is small, the resin pipe 6 in that part receives a concentrated load. Therefore, the resin undergoes plastic deformation and is crushed to form small pieces 64 (b in FIG. 5). Here, as described above, since the root 51 of the small protrusion 5 is inclined 51a, the small piece 64 is deformed so as to follow the end face 71 of the short metal pipe 7 inside the pipe.
[0016]
Thereafter, the press-fitting jig A is further press-fitted by the pressing force of the air cylinder 1, and reaches the place where the base portion 2 comes into contact with the opening edge 61 a of the resin pipe 6. At this stage, the small piece 64 squeezed by the small protrusion 5 covers the end face 71 of the short metal pipe 7 inside the pipe as shown in FIGS. Does not come off from the resin pipe 6. Even if there is a dimensional error in the short metal pipe length S ₁ and the expanded diameter portion length S ₂ , the error is absorbed in the plastic deformation process in which the small piece 64 is formed, and the small piece 64 covers the end surface 71. The metal short tube 7 is integrally fixed to the resin pipe 6. Thus, a desired resin pipe with a short metal pipe is completed.
At the final stage when the base portion 2 reaches the opening edge 61 a, the metal short tube 7 hits the stepped portion 63 of the resin pipe 6 and is locked. At the same time, since the size of the base portion 2 is larger than the outer diameter D ₅ of the resin pipe 6, the base portion 2 also hits the resin pipe opening edge 61a, and the base portion 2 is regulated so as not to push the metal short tube 7 any more. Is in the situation.
[0017]
(2) Resin pipe with short metal pipe The resin pipe with short metal pipe manufactured using the resin pipe with short metal pipe is shown in FIGS.
In the vicinity of the initial opening of the resin pipe 6 before processing, an enlarged diameter portion 62 having an inner diameter larger than other portions is formed as shown in FIG. 2, and the inner diameter D ₁ is the outer diameter D _{2 of the} short metal pipe 7. Same as or slightly larger. Further, the length S ₂ of the enlarged diameter portion 62 is longer than the short metal pipe length S ₁ by the pushing amount α. The opening edge 61a of the resin pipe 6 has a taper T so that the small piece 64 can be easily formed.
[0018]
The resin pipe 6 with a short metal pipe manufactured by the manufacturing apparatus has a shape in which the short metal pipe 7 is inserted into the enlarged diameter portion 62 of the resin pipe 6 and the short metal pipe 7 is placed in the back by the pushing amount α. Become. Therefore, as shown in FIG. 8, the tip of the short metal tube 7 is brought into contact with the stepped portion 63 where the enlarged diameter portion 62 ends, and the end face 71 of the short metal tube 7 closest to the opening 61 is covered with the small piece 64. The short metal pipe 7 is no longer able to move in the resin pipe 6. As described above, since the resin pipe opening edge 61a is plastically deformed by pressing the small protrusion 5 as described above, the portion 64 is lower than the level of the other resin pipe opening edges 61a.
In the present embodiment, the small pieces 64 are formed by the small protrusions 5. However, the present invention is not limited to this. For example, the resin pipe opening edge 61a may be deformed by a heating body such as a heater. This is because similar actions and effects are obtained.
[0019]
According to the resin pipe 6 with a short metal pipe and the manufacturing apparatus therefor configured as described above, a normal cylindrical metal pipe can be used for the short metal pipe 7 and the outer diameter D ₂ can be set to be equal to or less than the inner diameter D _{1 of the} resin pipe. Therefore, the resin pipe 6 can be prevented from being deformed, and the outer diameter dimensional accuracy of the resin pipe 6 can be maintained. The conventional problems that the outer diameter of the product is out of order or the crack is defective are solved.
Then, after the short metal tube 7 is placed in the resin pipe 6, the resin pipe opening edge 61 a is plastically deformed to form a small piece 64, and the small piece 64 covers the end surface 71 of the short metal tube 7. The short metal pipe 7 is locked to the small piece 64 and is integrally fixed to the resin pipe 6. There is no problem that the metal short tube 7 comes off because the resin absorbs moisture and the tightening force is relaxed, as in the conventional tightening of the short metal tube 7 by the resin pipe 6.
Further, when the short metal pipe 7 is inserted into the resin pipe 6, the resin pipe opening edge 61 a is partially plastically deformed inside the pipe by the small protrusion 5 provided in the press-fitting jig A, so that the short metal pipe 7 Since the insertion and the removal prevention processing of the metal short tube 7 can be performed at the same time, it is not necessary to increase a new manufacturing process, and it is possible to realize improvement in productivity and cost reduction.
Moreover, even if the press-fitting jig A is used, only a slight pressure is required at the final stage of forming the small piece 64, so that the manufacturing method is simplified and the production proceeds smoothly. After the small piece 64 is formed, the press-fitting jig A is pulled out, but the short metal pipe 7 remains in the resin pipe 6 and the small piece 64 bent by plastic deformation is accommodated in the groove 31. The press-fitting jig A can be pulled out without difficulty. Unlike the prior arts 1 and 2, forcing the short metal pipe 7 into the resin pipe 6, the workability is excellent. In addition, defects such as cracking of the resin pipe and disconnection of the short metal pipe 7 do not occur, and the short metal pipe 7 is reliably integrated with the resin pipe 6, so that the yield is improved.
[0020]
The present invention is not limited to those shown in the above-described embodiments, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material, etc. of the press-fitting jig A, actuator 1, base part 2, notched disk part 3, columnar part 4, small protrusion 5, resin pipe 6, short metal pipe 7 etc. are appropriately selected according to the application. You can choose. In the embodiment, two small pieces 64 are formed, but the number can be increased. The cutout disk portion 3 may be partially in contact with the end surface 71 of the short metal tube 7 at several locations. Further, the present invention is not limited to the intake pipe, and can be applied to a resin pipe for attaching various short metal pipes.
[0021]
【The invention's effect】
As described above, the resin pipe with a short metal pipe and the apparatus for manufacturing the same according to the present invention are not only integrally fixed to the resin pipe, but also the resin pipe is not deformed, and the productivity is improved. Excellent effects such as contributing to quality improvement and cost reduction.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an apparatus for producing a resin pipe with a short metal pipe together with the short metal pipe and the resin pipe before assembly in an embodiment of the present invention.
FIG. 2 is a plan view of the main part of FIG.
FIG. 3 is a side view of an essential part of a manufacturing apparatus for a resin pipe with a short metal pipe.
4 is an overall perspective view showing a state in which a metal short tube is fitted into a columnar portion from the state of FIG. 1; FIG.
FIG. 5 is a cross-sectional view around a small protrusion showing a process of forming a small piece.
6 is a cross-sectional view around a small protrusion showing a small piece forming process in another embodiment instead of FIG. 5. FIG.
FIG. 7 is a perspective view of a resin pipe with a short metal pipe manufactured by the manufacturing apparatus.
FIG. 8 is a longitudinal sectional view of a resin pipe with a short metal pipe manufactured by the manufacturing apparatus.
FIG. 9 is a side view of a resin pipe with a short metal pipe manufactured by the manufacturing apparatus.
FIG. 10 is an explanatory sectional view of the prior art.
FIG. 11 is an explanatory sectional view of the prior art.
[Explanation of symbols]
1 Air cylinder (actuator)
11 Rod (working shaft)
2 Base part 3 Notch disk part (press part)
31 groove 4 columnar part 5 small protrusion 6 resin pipe 61 opening 61a opening edge 63 step part 64 small piece 7 metal short pipe 71 end face A press fitting jig O central axis D ₁ ′ outer diameter

Claims (3)

A short metal pipe is inserted from one opening of the resin pipe, and the short metal pipe is locked by a step provided in the resin pipe and stored in the resin pipe, and the opening edge of the resin pipe is partially plastic. A resin pipe with a short metal pipe formed by forming a small piece that covers the end face of the short metal pipe inside the pipe under deformation. A press-fitting jig (A) is fixed to the operating shaft of the actuator (1), and the press-fitting jig is provided on a columnar part (4) into which a short metal tube can be inserted and on the actuator side end surface of the extra short metal tube. A presser part (3) that abuts, and a small protrusion (5) that can deform the resin pipe opening edge by pressing when the operating shaft of the actuator is extended, and a short metal pipe is inserted into the columnar part. An apparatus for producing a resin pipe with a short metal pipe, wherein the apparatus is inserted into a resin pipe and the resin pipe opening edge is partially plastically deformed inside the pipe by the small protrusion. The apparatus for producing a resin pipe with a short metal pipe according to claim 2, wherein a heating element is used instead of the small protrusion.

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