JPH02130128A - Cylindrical product having flange mounted to opening end part thereof and manufacture thereof - Google Patents

Abstract

PURPOSE:To surely and strongly fix a flange to the opening end part of a cylindrical member by forming a flange in such a state that the connection part provided so as to extend from the opening end part of the cylindrical member through the flat part thereof is integrally embedded in the flange. CONSTITUTION:An air introducing pipe 2 having a structure equipped with a flat part 8 and a connection part 10 is molded by blow-molding using a molding material such as glass fiber-containing nylon. When the movable mold 16 to which the air introducing pipe 2 is set is registered with a fixed mold 12 to form a molding cavity 14, the molding material, for example, nylon mixed with glass fibers or ceramics is injected in the cavity to fill the cavity and cooled and solidified to mold the flange 14. By this method, an air intake for a car is obtained.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a novel structure of a cylindrical product in which a flange is integrally provided at the open end of a cylindrical member, and a method for manufacturing the same.
In particular, the present invention relates to a technique for reliably and firmly forming a flange on an open end of a cylindrical member.

(Background technology) Because it is difficult to mold the flange at the same time as the cylindrical member in a cylindrical product in which a flange is integrally provided at the open end of the cylindrical member, the flange is formed separately from the cylindrical member. Some products are manufactured by molding a cylindrical member and then bonding a flange to the open end of the cylindrical member using a heat welding method.

For example, an automobile air intake (air intake port) that guides conditioned air conditioned by an air conditioner into the vehicle interior has a flange for mounting at one open end of the air introduction pipe as a cylindrical member. However, when manufacturing such air intakes, the air introduction pipe as a cylindrical member is usually formed by blow molding, and the mounting flange is attached to the air introduction pipe. Since it is difficult to mold them at the same time, it is possible to mold the air introduction pipe and the mounting flange separately, and then heat-weld the separately molded air introduction pipe and the mounting flange to bond them together. It is commonly practiced.

However, in the case of cylindrical products such as air intakes for automobiles, in which the cylindrical member and the flange are separately molded and then bonded together using a heat welding method, the cylindrical If the adhesive strength between the component and the flange is not necessarily stable and the product is installed in a place with strong vibrations,
There have been cases where cracks occur in the welded portion between the flange and the cylindrical member, causing them to separate.

In addition, when a cylindrical product is manufactured by bonding the cylindrical member and the flange together using a heat welding method,
Due to dimensional errors caused by the molding of the cylindrical member and the flange, there was also a risk that a gap would occur between the adhesive surfaces between the cylindrical member and the flange.

(Problem to be solved) The present invention has been made against the background of the above, and the problem to be solved is to solve the problem of the above-mentioned cylinder in which it is difficult to form the flange at the same time. It is an object of the present invention to provide a new structure of a cylindrical product that can securely and firmly fix a flange to the open end of a shaped member, and to provide a method for suitably manufacturing a cylindrical product having such a structure. It is in.

(Solution Means) In order to solve this problem, in the cylindrical product according to the present invention, the open end of the cylindrical member on which the flange is to be formed is provided with a flat surface along the shape of the open end. The connecting portion is extended radially outward, and the connecting portion is further extended so as to protrude from the flat portion into the space to be occupied by the flange, and the connecting portion is integrally buried inside,
A flange was formed.

In addition, in the method of the present invention, when manufacturing a cylindrical product having such a structure, (a) a flat portion along the shape of the opening end is radially extended from the opening end where the flange is to be formed; a step of preparing a cylindrical member having a structure in which the cylindrical member is extended outward in the direction, and a connecting portion having a predetermined shape is integrally extended from the flat portion of the cylindrical member into the space to be occupied by the flange;
b) setting the cylindrical member on a movable mold so that the outer surface of the flat portion is seated on a cavity forming surface provided on the movable mold; (c) a fixed mold main body;
The movable mold in which the cylindrical member is set is mold-aligned with a fixed mold including a nesting member that protrudes from the fixed mold main body side to the movable mold side, and the movable mold is used to form the cavity. It is brought into contact with the fixed main body of the fixed mold on the outside of the surface, and the distal end surface of the nesting member of the fixed mold is brought into contact with the cavity forming surface via the flat part of the cylindrical member. , between the movable type and the fixed type,
(d) forming a predetermined cavity into which the connecting portion of the cylindrical member is inserted; and (d) introducing a predetermined molding material into the cavity into which the connecting portion of the cylindrical member is inserted, cooling and cooling. The method includes a step of forming a flange by solidifying it, and (e) a step of removing the cylindrical member on which the flange is formed from the fixed mold and the movable mold.

(Function) In the cylindrical product having the structure according to the present invention, since the flange is formed with the connecting portion extending from the open end of the cylindrical member through the flat portion embedded inside, the cylindrical product The adhesion strength of the flange to the open end of the cylindrical member is extremely high, and the flange can be securely attached to the open end of the cylindrical member without forming a gap between the flange and the open end of the cylindrical member. It can be formed. According to the method of the present invention, a cylindrical member having such a structure can be suitably manufactured.

(Example) Hereinafter, in order to clarify the present invention more specifically,
An embodiment of the present invention applied to an air intake for an automobile will be described in detail based on the drawings.

First, FIG. 1 shows an external view of the main parts of an automobile air intake as a cylindrical product according to the present invention. In the figure, 2 is a curved air introduction pipe as a cylindrical member for guiding conditioned air etc. into the vehicle interior, and like a conventional air intake for automobiles, 2 is a curved air introduction pipe that is attached to one open end of the pipe. The flange 4 is integrally provided. The flange 4 is formed with an appropriate number of bolt insertion holes 6 for bolting the flange 4 to a predetermined fixing member.

Here, as shown in FIGS. 2 and 3, the cylindrical wall of the air introduction tube 2 is located at the open end where the flange 4 of the air introduction tube 2 as a cylindrical member is to be formed. An annular flat portion 8 is integrally formed and is bent and extended radially outward along the shape of the opening end, and an air introduction pipe 2 is further formed from the tip of the flat portion 8. A connecting portion 10 having a tapered cylindrical shape and extending outward in the axial direction into the space occupied by the flange 4 is integrally formed. As shown in FIGS. 2 and 3 by imaginary lines showing the outer shape of the flange 4, the flange 4 is fitted with the connecting portion 10 formed at the open end of the air introduction pipe 2 buried therein. 4 are integrally formed.

In automotive air intakes with this type of structure,
Since the mounting flange 4 is formed so that the connection part 10 formed integrally with the open end of the air introduction pipe 2 via the flat part 8 is embedded therein, the air introduction of the flange 4 is The adhesion strength to the pipe 2 is extremely strong, and even when installed in a place with strong vibrations, the flange 4
This prevents the air introduction pipe 2 from peeling off easily, and also prevents problems such as the formation of a gap between the flange 4 and the air introduction pipe 2.

Incidentally, the air intake having such a structure is manufactured according to the method of the present invention, for example, in the following manner.

That is, when manufacturing an air intake for an automobile having the structure as described above, first, using a predetermined molding material such as glass fiber-filled nylon, the flat portion 8 and the connecting portion 1 as described above are formed.
The air introduction pipe 2 having a structure including 0 is molded by blow molding, similar to the manufacturing method of conventional air intakes. .

Next, as shown in FIGS. 4 to 7, the air introduction pipe 2 formed by the blow molding method is placed between a fixed mold 12 and an annular cavity 14 for forming the flange 4. When the movable mold 16 and the fixed mold 12 are aligned, the flat portion 8 is located on the outer surface of the inner surface of the annular cavity forming surface 18 formed in the movable mold 16. It is set so that it is seated on the periphery. After the setting, the movable mold 16 is moved closer to the fixed mold 12, and the movable mold 16 is aligned with the fixed mold 12 to form an annular cavity 14 for molding the flange 4.

Here, as is clear from FIGS. 4 to 7, the movable mold 16 into which the air introduction pipe 2 is set has a structure in which the constituent part of the annular cavity forming surface 18 is divided into three parts in the circumferential direction.
A movable main body 20 is fixedly attached to a movable platen (not shown), and a movable main body 20 is attached to the movable main body 20 so as to be slidable in a direction perpendicular to the moving direction of the movable main body 20.
It consists of two slide molds 22 and 24. and,
The movable main body 20 is formed with an introduction tube fitting groove 26 corresponding to the outer surface shape of the air introduction tube 2, and is used to hold the air introduction tube 2 in the fitting position with respect to the introduction tube fitting groove 26. A clamping mechanism (not shown) is provided on the slide molds 22.24, and the slide molds 22.24 are provided with respective corresponding divisions relative to each other and to the movable mold body 20 during the formation of the cavity 14. A holding groove 28 corresponding to the outer surface shape of the air introduction pipe 2 is formed so that the surfaces can be brought into close contact with each other.
30 is formed.

Then, the air introduction pipe 2 formed by the blow molding method is inserted into the introduction pipe fitting groove of the movable mold body 20, as shown in FIGS. 4 and 5, into the movable mold 16. 26, and is held in that fitted position by a clamp mechanism and then inserted.
In this set state, the movable mold 16 is operated to approach the fixed mold 12. When the movable mold 16 is operated to approach the fixed mold 12 in this way, as shown by arrows A and B in FIGS. 4 and 5, the fixed mold 12 of the movable mold 16 With the approaching operation, the slide mold 22
．． 24 are slid in a direction approaching each other and the movable mold main body 20, and as shown in FIG. 20 and slide type 22.
24 are the introduction pipe fitting groove 26 and the holding groove 28.3.
Corresponding dividing surfaces of the movable mold main body 20 and the slide molds 22, 24 are brought into close contact with each other so as to surround the air introduction pipe 2 at 0.0. As a result, as shown in FIG. 7, when the movable mold 16 is aligned with the fixed mold 12, the annular cavity forming surface 18 is formed, and the flat portion of the air introduction pipe 2 is formed. 8 is seated on the inner periphery of the cavity forming surface 18 with its outer surface.

On the other hand, between the movable mold 16 and the cavity 1
As shown in FIGS. 5 to 7, the fixed mold 12 forming the mold 4 has a cavity forming surface 18 of the movable mold 16.
A recess 3 of a predetermined depth having an opening corresponding to the outer edge shape of the
2, and a nesting member 38 that is slidably fitted into a through hole 36 opening in the center of the bottom wall of the recess 32 and projected into the recess 32. configured.

Here, the nesting member 38 is always urged toward the distal end side by a spring 40 that is brought into contact with the back surface of the nesting member 38, and at its forward end position toward the distal end side, its distal end surface is aligned with the parting surface 40 of the fixed main body 34. and the road surface.

As described above, when the movable mold 16 in which the air introduction tube 2 is set is moved to approach the fixed mold 12, as shown in FIG. is brought into contact with the flat part 8 of the air introduction pipe 2 at the outer periphery of the movable mold 16, and then, as the movable mold 16 moves closer to the fixed mold 12, the fixed mold main body 34 is brought into contact with the flat part 8 of the air introduction pipe 2, as shown in FIG. On the outer parting surface 42 of the recess 32,
It is brought into contact with the outer surface of the cavity forming surface 18 of the movable mold 16, that is, the parting surface 44 of the movable mold 16.

Therefore, if the air introduction pipe 2 molded by the blow molding method is set in the movable mold 16, and the movable mold 16 with the air introduction pipe 2 set is matched to the fixed mold 12, the result shown in FIG. As shown, an annular cavity 14 for molding the flange 4 is formed between the fixed mold 12 and the movable mold 16 with the connecting portion 10 of the air introduction pipe 2 inserted therein. be.

In this way, when the movable mold 16 in which the air introduction pipe 2 is set is matched with the fixed mold f2 and the cavity 14 for molding the flange 4 is formed, then the mold shown in FIG. A predetermined molding material, such as nylon mixed with glass fiber or ceramics, is injected and filled into the cavity 14, and is cooled and solidified to form the flange 4. After the molding material injected and filled into the cavity 14 has cooled and solidified, the movable mold 16 is opened from the fixed mold 12, and after the mold opening, the air introduction pipe 2 is inserted from the movable mold 16. removed. As a result, the automobile air intake shown in FIG. 1 is obtained.

In this case, the injection filling operation of the molding material into the cavity 14 is performed using the fixed mold 12 as shown in FIG.
The parting surface 42 of the movable mold 16 and the parting surface 4 of the movable mold 16
This is done through a gate 46 provided between 4 and 4.

Further, the bolt insertion hole 6 formed in the flange 4 is
Usually, from the fixed mold body 34 of the fixed mold 12 to the cavity 14
After the air intake is removed from the movable mold 16, the flange 4
It is also possible to form the holes by processing.

As described above, according to the method of this embodiment, an air intake for an automobile having the structure shown in FIG. 1 can be suitably manufactured. , the nesting member 38 defining the inner surface of the annular cavity 14 is placed against the flat part 8 of the air introduction tube 2,
Since the air introduction tube 2 is biased by the spring 40 and comes into contact, even if the flat portion 8 has some thickness unevenness during molding of the air introduction tube 2, the cavity 14 is reliably closed. Another advantage is that the resin material injected into the cavity 14 is effectively prevented from leaking outside and causing molding defects.

Although one embodiment of the present invention has been described in detail above, this is a literal illustration, and the present invention is not limited to such a specific example, and within the scope of the spirit thereof,
It goes without saying that the present invention can be implemented with various changes, modifications, improvements, etc.

For example, in the air intake of the above embodiment, the connecting portion 10 of the air introduction pipe 2 as a cylindrical member has a tapered cylindrical structure, but the connecting portion 10 does not necessarily have to have a tapered cylindrical structure. Instead, it is possible to have a cylindrical structure with various cross-sectional shapes such as an S-shaped cross section or an L-shaped cross section, and a plurality of protruding pieces formed independently of each other in the circumferential direction of the flat part 8. It is also possible to form the connecting portion 10 as a. Furthermore, the flat portion 8 does not necessarily have to be formed into an annular shape as in the embodiments described above.

Furthermore, in the method of the embodiment, when the movable mold 16 is aligned with the fixed mold 12, the air introduction pipe 2 as a cylindrical member is not necessarily positioned reliably with respect to the movable mold 16. However, as shown in FIG. 9, a protrusion 48 extending in the circumferential direction is formed on the outer peripheral surface of the air introduction pipe 2, and when the movable mold 16 is aligned with the fixed mold 12, the movable mold main body 20 and the two slides Type 22.
24 into the respective introduction pipe fitting grooves 26 and holding grooves 28.
．． It is also possible to make the air introduction pipe 2 be reliably positioned on the movable mold 16 by making the protrusion 48 come into contact with the protrusion 48 at the position of the air introduction pipe 30 . Note that if such a protrusion 48 or a plurality of protrusions that perform an equivalent function are provided, the cylinder size will be reduced compared to a case where such protrusion 48 or protrusions are not provided. The dimensional accuracy of the air intake as a shaped product can be improved.

Furthermore, in the method of the embodiment, the movable mold 16 into which the air introduction pipe 2 as a cylindrical member is set is composed of three divided molds: one movable main body 20 and two slide molds 22 and 24, and is fixed. The three divided molds were assembled into the final molded form as a result of the mold matching operation (approaching operation) to the mold 12, but the movable mold 16 can be assembled into two or four or more divided molds. Alternatively, it is also possible to assemble the movable mold 16 into the final molded form at a stage before the movable mold 16 approaches the fixed mold 12.

In addition, in the method of the embodiment, the flange molding cavity 1
A nesting member 38 defining an inner circumferential surface of the fixed body 34
The movable mold 16 is arranged so as to be movable relative to the
Although the nesting member 38 is biased toward the side by a spring 40 and made to protrude, the nesting member 38 does not necessarily need to be disposed on the fixed body 34 in such a manner, and it is not necessary that the nesting member 38 be provided in a fixed manner with respect to the fixed body 34. Alternatively, it may be provided integrally with the fixed main body 34.

In addition, in the method of the embodiment, the air intake pipe 2 as a cylindrical member is molded by a blow molding method, and the molding material is introduced into the flange molding cavity 14 by injection. Although the present invention has been described for the case where the present invention is applied to the above, the present invention is not limited to the manufacture of such air intakes for automobiles. The method of the present invention can be applied to any cylindrical product having a structure in which a flange is integrally provided on at least one side of the cylindrical member, regardless of the method of molding the cylindrical member or the method of introducing the molding material into the flange molding cavity. It is possible to do so.

(Effects of the Invention) As is clear from the above description, in the cylindrical product according to the present invention, the flange has a connecting portion integrally extending from the open end of the cylindrical member into the flange.・Since it is formed in a buried state, the adhesion strength of the flange to the cylindrical member is extremely strong (there is an advantage that the flange does not easily peel or separate from the cylindrical member, and the flange and the cylindrical member are This has the advantage that gaps between the members can be effectively avoided.
According to the method of the present invention, a cylindrical product having such a structure can be suitably manufactured.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts showing an example of an automotive air intake as a cylindrical product according to the present invention, and FIGS. 2 and 3 respectively show an air introduction pipe of the air intake of FIG. 1. 4 to 8 are explanatory diagrams for explaining a flange forming process for one end of the air introduction pipe of the air intake shown in FIG. 1. FIG. FIG. 9 is a diagram corresponding to FIG. 7 for explaining another embodiment method of the present invention. 2: Air introduction pipe (cylindrical member) 4: Flange 8: Flat part lO: Connecting part 12: Fixed mold 14: Cavity 16: Movable mold 18: Cavity forming surface 20: Movable mold main body 22.2
4Ni-Ride type 34: Fixed type main body 38: Nested member
40 Spring 48: Protrusion Figure 1 Applicant Kojima Press Kogyo Co., Ltd. Figure 5 Minoh 2 Figure 3 Figure 7 Figure 8 Figure 4

Claims (2)

[Claims] (1) A cylindrical product in which a flange is integrally formed at the open end of a cylindrical member, the flange being formed at the open end of the cylindrical member,
A flat part that follows the shape of the opening end extends radially outward, and a connecting part is further extended from the flat part so as to protrude into the space to be occupied by the flange,
1. A cylindrical product having a flange at an open end, characterized in that the flange is formed with the connecting portion embedded integrally inside the product. (2) A method for manufacturing a cylindrical product in which a flange is integrally formed at the open end of a cylindrical member, in which a flange is formed along the shape of the open end from the open end where the flange is to be formed. preparing a cylindrical member having a structure in which a flat part extends radially outward and a connecting part having a predetermined shape extends integrally from the flat part into a space to be occupied by the flange; and a step of setting the cylindrical member on a movable mold so that the outer surface of the flat portion is seated on a predetermined cavity forming surface provided on the movable mold; and a fixed mold main body, and the fixed mold body. The movable mold, in which the cylindrical member is set, is matched against a fixed mold including a nesting member that protrudes from the mold main body side to the movable mold side, and the movable mold is placed on the cavity forming surface. The outer side is brought into contact with the fixed body of the fixed mold, and the cavity forming surface is brought into contact with the distal end surface of the nesting member of the fixed mold via the flat part of the cylindrical member. forming a predetermined cavity between the movable mold and the fixed mold into which the connecting portion of the cylindrical member is inserted; and filling a predetermined molding material into the cavity into which the connecting portion of the cylindrical member is inserted. The flange is formed by introducing, cooling and solidifying the flange, and the step of demolding the cylindrical member on which the flange is formed from the fixed mold and the movable mold. A method for manufacturing a cylindrical product with a flange at the open end.